1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4 *
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
6 */
7
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
13 #include <linux/vmalloc.h>
14 #include <linux/rhashtable.h>
15 #include <linux/audit.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_flow_table.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_tables_offload.h>
23 #include <net/net_namespace.h>
24 #include <net/sock.h>
25
26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
27
28 unsigned int nf_tables_net_id __read_mostly;
29
30 static LIST_HEAD(nf_tables_expressions);
31 static LIST_HEAD(nf_tables_objects);
32 static LIST_HEAD(nf_tables_flowtables);
33 static LIST_HEAD(nf_tables_destroy_list);
34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
35
36 enum {
37 NFT_VALIDATE_SKIP = 0,
38 NFT_VALIDATE_NEED,
39 NFT_VALIDATE_DO,
40 };
41
42 static struct rhltable nft_objname_ht;
43
44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
47
48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
51
52 static const struct rhashtable_params nft_chain_ht_params = {
53 .head_offset = offsetof(struct nft_chain, rhlhead),
54 .key_offset = offsetof(struct nft_chain, name),
55 .hashfn = nft_chain_hash,
56 .obj_hashfn = nft_chain_hash_obj,
57 .obj_cmpfn = nft_chain_hash_cmp,
58 .automatic_shrinking = true,
59 };
60
61 static const struct rhashtable_params nft_objname_ht_params = {
62 .head_offset = offsetof(struct nft_object, rhlhead),
63 .key_offset = offsetof(struct nft_object, key),
64 .hashfn = nft_objname_hash,
65 .obj_hashfn = nft_objname_hash_obj,
66 .obj_cmpfn = nft_objname_hash_cmp,
67 .automatic_shrinking = true,
68 };
69
70 struct nft_audit_data {
71 struct nft_table *table;
72 int entries;
73 int op;
74 struct list_head list;
75 };
76
77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
78 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
79 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
80 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
81 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
82 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
83 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
84 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
85 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
86 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
87 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
88 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
89 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
90 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
91 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
92 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
93 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
94 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
95 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
96 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
97 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
98 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
99 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
100 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
101 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
102 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
103 };
104
nft_validate_state_update(struct net * net,u8 new_validate_state)105 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
106 {
107 struct nftables_pernet *nft_net = nft_pernet(net);
108
109 switch (nft_net->validate_state) {
110 case NFT_VALIDATE_SKIP:
111 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
112 break;
113 case NFT_VALIDATE_NEED:
114 break;
115 case NFT_VALIDATE_DO:
116 if (new_validate_state == NFT_VALIDATE_NEED)
117 return;
118 }
119
120 nft_net->validate_state = new_validate_state;
121 }
122 static void nf_tables_trans_destroy_work(struct work_struct *w);
123 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
124
nft_ctx_init(struct nft_ctx * ctx,struct net * net,const struct sk_buff * skb,const struct nlmsghdr * nlh,u8 family,struct nft_table * table,struct nft_chain * chain,const struct nlattr * const * nla)125 static void nft_ctx_init(struct nft_ctx *ctx,
126 struct net *net,
127 const struct sk_buff *skb,
128 const struct nlmsghdr *nlh,
129 u8 family,
130 struct nft_table *table,
131 struct nft_chain *chain,
132 const struct nlattr * const *nla)
133 {
134 ctx->net = net;
135 ctx->family = family;
136 ctx->level = 0;
137 ctx->table = table;
138 ctx->chain = chain;
139 ctx->nla = nla;
140 ctx->portid = NETLINK_CB(skb).portid;
141 ctx->report = nlmsg_report(nlh);
142 ctx->flags = nlh->nlmsg_flags;
143 ctx->seq = nlh->nlmsg_seq;
144 }
145
nft_trans_alloc_gfp(const struct nft_ctx * ctx,int msg_type,u32 size,gfp_t gfp)146 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
147 int msg_type, u32 size, gfp_t gfp)
148 {
149 struct nft_trans *trans;
150
151 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
152 if (trans == NULL)
153 return NULL;
154
155 INIT_LIST_HEAD(&trans->list);
156 trans->msg_type = msg_type;
157 trans->ctx = *ctx;
158
159 return trans;
160 }
161
nft_trans_alloc(const struct nft_ctx * ctx,int msg_type,u32 size)162 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
163 int msg_type, u32 size)
164 {
165 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
166 }
167
nft_trans_destroy(struct nft_trans * trans)168 static void nft_trans_destroy(struct nft_trans *trans)
169 {
170 list_del(&trans->list);
171 kfree(trans);
172 }
173
nft_set_trans_bind(const struct nft_ctx * ctx,struct nft_set * set)174 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
175 {
176 struct nftables_pernet *nft_net;
177 struct net *net = ctx->net;
178 struct nft_trans *trans;
179
180 if (!nft_set_is_anonymous(set))
181 return;
182
183 nft_net = nft_pernet(net);
184 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
185 switch (trans->msg_type) {
186 case NFT_MSG_NEWSET:
187 if (nft_trans_set(trans) == set)
188 nft_trans_set_bound(trans) = true;
189 break;
190 case NFT_MSG_NEWSETELEM:
191 if (nft_trans_elem_set(trans) == set)
192 nft_trans_elem_set_bound(trans) = true;
193 break;
194 }
195 }
196 }
197
nft_netdev_register_hooks(struct net * net,struct list_head * hook_list)198 static int nft_netdev_register_hooks(struct net *net,
199 struct list_head *hook_list)
200 {
201 struct nft_hook *hook;
202 int err, j;
203
204 j = 0;
205 list_for_each_entry(hook, hook_list, list) {
206 err = nf_register_net_hook(net, &hook->ops);
207 if (err < 0)
208 goto err_register;
209
210 j++;
211 }
212 return 0;
213
214 err_register:
215 list_for_each_entry(hook, hook_list, list) {
216 if (j-- <= 0)
217 break;
218
219 nf_unregister_net_hook(net, &hook->ops);
220 }
221 return err;
222 }
223
nft_netdev_unregister_hooks(struct net * net,struct list_head * hook_list,bool release_netdev)224 static void nft_netdev_unregister_hooks(struct net *net,
225 struct list_head *hook_list,
226 bool release_netdev)
227 {
228 struct nft_hook *hook, *next;
229
230 list_for_each_entry_safe(hook, next, hook_list, list) {
231 nf_unregister_net_hook(net, &hook->ops);
232 if (release_netdev) {
233 list_del(&hook->list);
234 kfree_rcu(hook, rcu);
235 }
236 }
237 }
238
nf_tables_register_hook(struct net * net,const struct nft_table * table,struct nft_chain * chain)239 static int nf_tables_register_hook(struct net *net,
240 const struct nft_table *table,
241 struct nft_chain *chain)
242 {
243 struct nft_base_chain *basechain;
244 const struct nf_hook_ops *ops;
245
246 if (table->flags & NFT_TABLE_F_DORMANT ||
247 !nft_is_base_chain(chain))
248 return 0;
249
250 basechain = nft_base_chain(chain);
251 ops = &basechain->ops;
252
253 if (basechain->type->ops_register)
254 return basechain->type->ops_register(net, ops);
255
256 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
257 return nft_netdev_register_hooks(net, &basechain->hook_list);
258
259 return nf_register_net_hook(net, &basechain->ops);
260 }
261
__nf_tables_unregister_hook(struct net * net,const struct nft_table * table,struct nft_chain * chain,bool release_netdev)262 static void __nf_tables_unregister_hook(struct net *net,
263 const struct nft_table *table,
264 struct nft_chain *chain,
265 bool release_netdev)
266 {
267 struct nft_base_chain *basechain;
268 const struct nf_hook_ops *ops;
269
270 if (table->flags & NFT_TABLE_F_DORMANT ||
271 !nft_is_base_chain(chain))
272 return;
273 basechain = nft_base_chain(chain);
274 ops = &basechain->ops;
275
276 if (basechain->type->ops_unregister)
277 return basechain->type->ops_unregister(net, ops);
278
279 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
280 nft_netdev_unregister_hooks(net, &basechain->hook_list,
281 release_netdev);
282 else
283 nf_unregister_net_hook(net, &basechain->ops);
284 }
285
nf_tables_unregister_hook(struct net * net,const struct nft_table * table,struct nft_chain * chain)286 static void nf_tables_unregister_hook(struct net *net,
287 const struct nft_table *table,
288 struct nft_chain *chain)
289 {
290 return __nf_tables_unregister_hook(net, table, chain, false);
291 }
292
nft_trans_commit_list_add_tail(struct net * net,struct nft_trans * trans)293 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
294 {
295 struct nftables_pernet *nft_net = nft_pernet(net);
296
297 list_add_tail(&trans->list, &nft_net->commit_list);
298 }
299
nft_trans_table_add(struct nft_ctx * ctx,int msg_type)300 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
301 {
302 struct nft_trans *trans;
303
304 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
305 if (trans == NULL)
306 return -ENOMEM;
307
308 if (msg_type == NFT_MSG_NEWTABLE)
309 nft_activate_next(ctx->net, ctx->table);
310
311 nft_trans_commit_list_add_tail(ctx->net, trans);
312 return 0;
313 }
314
nft_deltable(struct nft_ctx * ctx)315 static int nft_deltable(struct nft_ctx *ctx)
316 {
317 int err;
318
319 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
320 if (err < 0)
321 return err;
322
323 nft_deactivate_next(ctx->net, ctx->table);
324 return err;
325 }
326
nft_trans_chain_add(struct nft_ctx * ctx,int msg_type)327 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
328 {
329 struct nft_trans *trans;
330
331 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
332 if (trans == NULL)
333 return ERR_PTR(-ENOMEM);
334
335 if (msg_type == NFT_MSG_NEWCHAIN) {
336 nft_activate_next(ctx->net, ctx->chain);
337
338 if (ctx->nla[NFTA_CHAIN_ID]) {
339 nft_trans_chain_id(trans) =
340 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
341 }
342 }
343
344 nft_trans_commit_list_add_tail(ctx->net, trans);
345 return trans;
346 }
347
nft_delchain(struct nft_ctx * ctx)348 static int nft_delchain(struct nft_ctx *ctx)
349 {
350 struct nft_trans *trans;
351
352 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
353 if (IS_ERR(trans))
354 return PTR_ERR(trans);
355
356 ctx->table->use--;
357 nft_deactivate_next(ctx->net, ctx->chain);
358
359 return 0;
360 }
361
nft_rule_expr_activate(const struct nft_ctx * ctx,struct nft_rule * rule)362 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
363 struct nft_rule *rule)
364 {
365 struct nft_expr *expr;
366
367 expr = nft_expr_first(rule);
368 while (nft_expr_more(rule, expr)) {
369 if (expr->ops->activate)
370 expr->ops->activate(ctx, expr);
371
372 expr = nft_expr_next(expr);
373 }
374 }
375
nft_rule_expr_deactivate(const struct nft_ctx * ctx,struct nft_rule * rule,enum nft_trans_phase phase)376 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
377 struct nft_rule *rule,
378 enum nft_trans_phase phase)
379 {
380 struct nft_expr *expr;
381
382 expr = nft_expr_first(rule);
383 while (nft_expr_more(rule, expr)) {
384 if (expr->ops->deactivate)
385 expr->ops->deactivate(ctx, expr, phase);
386
387 expr = nft_expr_next(expr);
388 }
389 }
390
391 static int
nf_tables_delrule_deactivate(struct nft_ctx * ctx,struct nft_rule * rule)392 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
393 {
394 /* You cannot delete the same rule twice */
395 if (nft_is_active_next(ctx->net, rule)) {
396 nft_deactivate_next(ctx->net, rule);
397 ctx->chain->use--;
398 return 0;
399 }
400 return -ENOENT;
401 }
402
nft_trans_rule_add(struct nft_ctx * ctx,int msg_type,struct nft_rule * rule)403 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
404 struct nft_rule *rule)
405 {
406 struct nft_trans *trans;
407
408 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
409 if (trans == NULL)
410 return NULL;
411
412 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
413 nft_trans_rule_id(trans) =
414 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
415 }
416 nft_trans_rule(trans) = rule;
417 nft_trans_commit_list_add_tail(ctx->net, trans);
418
419 return trans;
420 }
421
nft_delrule(struct nft_ctx * ctx,struct nft_rule * rule)422 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
423 {
424 struct nft_flow_rule *flow;
425 struct nft_trans *trans;
426 int err;
427
428 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
429 if (trans == NULL)
430 return -ENOMEM;
431
432 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
433 flow = nft_flow_rule_create(ctx->net, rule);
434 if (IS_ERR(flow)) {
435 nft_trans_destroy(trans);
436 return PTR_ERR(flow);
437 }
438
439 nft_trans_flow_rule(trans) = flow;
440 }
441
442 err = nf_tables_delrule_deactivate(ctx, rule);
443 if (err < 0) {
444 nft_trans_destroy(trans);
445 return err;
446 }
447 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
448
449 return 0;
450 }
451
nft_delrule_by_chain(struct nft_ctx * ctx)452 static int nft_delrule_by_chain(struct nft_ctx *ctx)
453 {
454 struct nft_rule *rule;
455 int err;
456
457 list_for_each_entry(rule, &ctx->chain->rules, list) {
458 if (!nft_is_active_next(ctx->net, rule))
459 continue;
460
461 err = nft_delrule(ctx, rule);
462 if (err < 0)
463 return err;
464 }
465 return 0;
466 }
467
__nft_trans_set_add(const struct nft_ctx * ctx,int msg_type,struct nft_set * set,const struct nft_set_desc * desc)468 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
469 struct nft_set *set,
470 const struct nft_set_desc *desc)
471 {
472 struct nft_trans *trans;
473
474 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
475 if (trans == NULL)
476 return -ENOMEM;
477
478 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
479 nft_trans_set_id(trans) =
480 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
481 nft_activate_next(ctx->net, set);
482 }
483 nft_trans_set(trans) = set;
484 if (desc) {
485 nft_trans_set_update(trans) = true;
486 nft_trans_set_gc_int(trans) = desc->gc_int;
487 nft_trans_set_timeout(trans) = desc->timeout;
488 }
489 nft_trans_commit_list_add_tail(ctx->net, trans);
490
491 return 0;
492 }
493
nft_trans_set_add(const struct nft_ctx * ctx,int msg_type,struct nft_set * set)494 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
495 struct nft_set *set)
496 {
497 return __nft_trans_set_add(ctx, msg_type, set, NULL);
498 }
499
nft_delset(const struct nft_ctx * ctx,struct nft_set * set)500 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
501 {
502 int err;
503
504 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
505 if (err < 0)
506 return err;
507
508 nft_deactivate_next(ctx->net, set);
509 ctx->table->use--;
510
511 return err;
512 }
513
nft_trans_obj_add(struct nft_ctx * ctx,int msg_type,struct nft_object * obj)514 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
515 struct nft_object *obj)
516 {
517 struct nft_trans *trans;
518
519 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
520 if (trans == NULL)
521 return -ENOMEM;
522
523 if (msg_type == NFT_MSG_NEWOBJ)
524 nft_activate_next(ctx->net, obj);
525
526 nft_trans_obj(trans) = obj;
527 nft_trans_commit_list_add_tail(ctx->net, trans);
528
529 return 0;
530 }
531
nft_delobj(struct nft_ctx * ctx,struct nft_object * obj)532 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
533 {
534 int err;
535
536 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
537 if (err < 0)
538 return err;
539
540 nft_deactivate_next(ctx->net, obj);
541 ctx->table->use--;
542
543 return err;
544 }
545
nft_trans_flowtable_add(struct nft_ctx * ctx,int msg_type,struct nft_flowtable * flowtable)546 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
547 struct nft_flowtable *flowtable)
548 {
549 struct nft_trans *trans;
550
551 trans = nft_trans_alloc(ctx, msg_type,
552 sizeof(struct nft_trans_flowtable));
553 if (trans == NULL)
554 return -ENOMEM;
555
556 if (msg_type == NFT_MSG_NEWFLOWTABLE)
557 nft_activate_next(ctx->net, flowtable);
558
559 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
560 nft_trans_flowtable(trans) = flowtable;
561 nft_trans_commit_list_add_tail(ctx->net, trans);
562
563 return 0;
564 }
565
nft_delflowtable(struct nft_ctx * ctx,struct nft_flowtable * flowtable)566 static int nft_delflowtable(struct nft_ctx *ctx,
567 struct nft_flowtable *flowtable)
568 {
569 int err;
570
571 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
572 if (err < 0)
573 return err;
574
575 nft_deactivate_next(ctx->net, flowtable);
576 ctx->table->use--;
577
578 return err;
579 }
580
__nft_reg_track_clobber(struct nft_regs_track * track,u8 dreg)581 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
582 {
583 int i;
584
585 for (i = track->regs[dreg].num_reg; i > 0; i--)
586 __nft_reg_track_cancel(track, dreg - i);
587 }
588
__nft_reg_track_update(struct nft_regs_track * track,const struct nft_expr * expr,u8 dreg,u8 num_reg)589 static void __nft_reg_track_update(struct nft_regs_track *track,
590 const struct nft_expr *expr,
591 u8 dreg, u8 num_reg)
592 {
593 track->regs[dreg].selector = expr;
594 track->regs[dreg].bitwise = NULL;
595 track->regs[dreg].num_reg = num_reg;
596 }
597
nft_reg_track_update(struct nft_regs_track * track,const struct nft_expr * expr,u8 dreg,u8 len)598 void nft_reg_track_update(struct nft_regs_track *track,
599 const struct nft_expr *expr, u8 dreg, u8 len)
600 {
601 unsigned int regcount;
602 int i;
603
604 __nft_reg_track_clobber(track, dreg);
605
606 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
607 for (i = 0; i < regcount; i++, dreg++)
608 __nft_reg_track_update(track, expr, dreg, i);
609 }
610 EXPORT_SYMBOL_GPL(nft_reg_track_update);
611
nft_reg_track_cancel(struct nft_regs_track * track,u8 dreg,u8 len)612 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
613 {
614 unsigned int regcount;
615 int i;
616
617 __nft_reg_track_clobber(track, dreg);
618
619 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
620 for (i = 0; i < regcount; i++, dreg++)
621 __nft_reg_track_cancel(track, dreg);
622 }
623 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
624
__nft_reg_track_cancel(struct nft_regs_track * track,u8 dreg)625 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
626 {
627 track->regs[dreg].selector = NULL;
628 track->regs[dreg].bitwise = NULL;
629 track->regs[dreg].num_reg = 0;
630 }
631 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
632
633 /*
634 * Tables
635 */
636
nft_table_lookup(const struct net * net,const struct nlattr * nla,u8 family,u8 genmask,u32 nlpid)637 static struct nft_table *nft_table_lookup(const struct net *net,
638 const struct nlattr *nla,
639 u8 family, u8 genmask, u32 nlpid)
640 {
641 struct nftables_pernet *nft_net;
642 struct nft_table *table;
643
644 if (nla == NULL)
645 return ERR_PTR(-EINVAL);
646
647 nft_net = nft_pernet(net);
648 list_for_each_entry_rcu(table, &nft_net->tables, list,
649 lockdep_is_held(&nft_net->commit_mutex)) {
650 if (!nla_strcmp(nla, table->name) &&
651 table->family == family &&
652 nft_active_genmask(table, genmask)) {
653 if (nft_table_has_owner(table) &&
654 nlpid && table->nlpid != nlpid)
655 return ERR_PTR(-EPERM);
656
657 return table;
658 }
659 }
660
661 return ERR_PTR(-ENOENT);
662 }
663
nft_table_lookup_byhandle(const struct net * net,const struct nlattr * nla,u8 genmask,u32 nlpid)664 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
665 const struct nlattr *nla,
666 u8 genmask, u32 nlpid)
667 {
668 struct nftables_pernet *nft_net;
669 struct nft_table *table;
670
671 nft_net = nft_pernet(net);
672 list_for_each_entry(table, &nft_net->tables, list) {
673 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
674 nft_active_genmask(table, genmask)) {
675 if (nft_table_has_owner(table) &&
676 nlpid && table->nlpid != nlpid)
677 return ERR_PTR(-EPERM);
678
679 return table;
680 }
681 }
682
683 return ERR_PTR(-ENOENT);
684 }
685
nf_tables_alloc_handle(struct nft_table * table)686 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
687 {
688 return ++table->hgenerator;
689 }
690
691 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
692
693 static const struct nft_chain_type *
__nft_chain_type_get(u8 family,enum nft_chain_types type)694 __nft_chain_type_get(u8 family, enum nft_chain_types type)
695 {
696 if (family >= NFPROTO_NUMPROTO ||
697 type >= NFT_CHAIN_T_MAX)
698 return NULL;
699
700 return chain_type[family][type];
701 }
702
703 static const struct nft_chain_type *
__nf_tables_chain_type_lookup(const struct nlattr * nla,u8 family)704 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
705 {
706 const struct nft_chain_type *type;
707 int i;
708
709 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
710 type = __nft_chain_type_get(family, i);
711 if (!type)
712 continue;
713 if (!nla_strcmp(nla, type->name))
714 return type;
715 }
716 return NULL;
717 }
718
719 struct nft_module_request {
720 struct list_head list;
721 char module[MODULE_NAME_LEN];
722 bool done;
723 };
724
725 #ifdef CONFIG_MODULES
nft_request_module(struct net * net,const char * fmt,...)726 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
727 ...)
728 {
729 char module_name[MODULE_NAME_LEN];
730 struct nftables_pernet *nft_net;
731 struct nft_module_request *req;
732 va_list args;
733 int ret;
734
735 va_start(args, fmt);
736 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
737 va_end(args);
738 if (ret >= MODULE_NAME_LEN)
739 return 0;
740
741 nft_net = nft_pernet(net);
742 list_for_each_entry(req, &nft_net->module_list, list) {
743 if (!strcmp(req->module, module_name)) {
744 if (req->done)
745 return 0;
746
747 /* A request to load this module already exists. */
748 return -EAGAIN;
749 }
750 }
751
752 req = kmalloc(sizeof(*req), GFP_KERNEL);
753 if (!req)
754 return -ENOMEM;
755
756 req->done = false;
757 strscpy(req->module, module_name, MODULE_NAME_LEN);
758 list_add_tail(&req->list, &nft_net->module_list);
759
760 return -EAGAIN;
761 }
762 EXPORT_SYMBOL_GPL(nft_request_module);
763 #endif
764
lockdep_nfnl_nft_mutex_not_held(void)765 static void lockdep_nfnl_nft_mutex_not_held(void)
766 {
767 #ifdef CONFIG_PROVE_LOCKING
768 if (debug_locks)
769 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
770 #endif
771 }
772
773 static const struct nft_chain_type *
nf_tables_chain_type_lookup(struct net * net,const struct nlattr * nla,u8 family,bool autoload)774 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
775 u8 family, bool autoload)
776 {
777 const struct nft_chain_type *type;
778
779 type = __nf_tables_chain_type_lookup(nla, family);
780 if (type != NULL)
781 return type;
782
783 lockdep_nfnl_nft_mutex_not_held();
784 #ifdef CONFIG_MODULES
785 if (autoload) {
786 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
787 nla_len(nla),
788 (const char *)nla_data(nla)) == -EAGAIN)
789 return ERR_PTR(-EAGAIN);
790 }
791 #endif
792 return ERR_PTR(-ENOENT);
793 }
794
nft_base_seq(const struct net * net)795 static __be16 nft_base_seq(const struct net *net)
796 {
797 struct nftables_pernet *nft_net = nft_pernet(net);
798
799 return htons(nft_net->base_seq & 0xffff);
800 }
801
802 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
803 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
804 .len = NFT_TABLE_MAXNAMELEN - 1 },
805 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
806 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
807 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
808 .len = NFT_USERDATA_MAXLEN }
809 };
810
nf_tables_fill_table_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,int event,u32 flags,int family,const struct nft_table * table)811 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
812 u32 portid, u32 seq, int event, u32 flags,
813 int family, const struct nft_table *table)
814 {
815 struct nlmsghdr *nlh;
816
817 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
818 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
819 NFNETLINK_V0, nft_base_seq(net));
820 if (!nlh)
821 goto nla_put_failure;
822
823 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
824 nla_put_be32(skb, NFTA_TABLE_FLAGS,
825 htonl(table->flags & NFT_TABLE_F_MASK)) ||
826 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
827 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
828 NFTA_TABLE_PAD))
829 goto nla_put_failure;
830 if (nft_table_has_owner(table) &&
831 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
832 goto nla_put_failure;
833
834 if (table->udata) {
835 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
836 goto nla_put_failure;
837 }
838
839 nlmsg_end(skb, nlh);
840 return 0;
841
842 nla_put_failure:
843 nlmsg_trim(skb, nlh);
844 return -1;
845 }
846
847 struct nftnl_skb_parms {
848 bool report;
849 };
850 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
851
nft_notify_enqueue(struct sk_buff * skb,bool report,struct list_head * notify_list)852 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
853 struct list_head *notify_list)
854 {
855 NFT_CB(skb).report = report;
856 list_add_tail(&skb->list, notify_list);
857 }
858
nf_tables_table_notify(const struct nft_ctx * ctx,int event)859 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
860 {
861 struct nftables_pernet *nft_net;
862 struct sk_buff *skb;
863 u16 flags = 0;
864 int err;
865
866 if (!ctx->report &&
867 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
868 return;
869
870 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
871 if (skb == NULL)
872 goto err;
873
874 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
875 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
876
877 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
878 event, flags, ctx->family, ctx->table);
879 if (err < 0) {
880 kfree_skb(skb);
881 goto err;
882 }
883
884 nft_net = nft_pernet(ctx->net);
885 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
886 return;
887 err:
888 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
889 }
890
nf_tables_dump_tables(struct sk_buff * skb,struct netlink_callback * cb)891 static int nf_tables_dump_tables(struct sk_buff *skb,
892 struct netlink_callback *cb)
893 {
894 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
895 struct nftables_pernet *nft_net;
896 const struct nft_table *table;
897 unsigned int idx = 0, s_idx = cb->args[0];
898 struct net *net = sock_net(skb->sk);
899 int family = nfmsg->nfgen_family;
900
901 rcu_read_lock();
902 nft_net = nft_pernet(net);
903 cb->seq = READ_ONCE(nft_net->base_seq);
904
905 list_for_each_entry_rcu(table, &nft_net->tables, list) {
906 if (family != NFPROTO_UNSPEC && family != table->family)
907 continue;
908
909 if (idx < s_idx)
910 goto cont;
911 if (idx > s_idx)
912 memset(&cb->args[1], 0,
913 sizeof(cb->args) - sizeof(cb->args[0]));
914 if (!nft_is_active(net, table))
915 continue;
916 if (nf_tables_fill_table_info(skb, net,
917 NETLINK_CB(cb->skb).portid,
918 cb->nlh->nlmsg_seq,
919 NFT_MSG_NEWTABLE, NLM_F_MULTI,
920 table->family, table) < 0)
921 goto done;
922
923 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
924 cont:
925 idx++;
926 }
927 done:
928 rcu_read_unlock();
929 cb->args[0] = idx;
930 return skb->len;
931 }
932
nft_netlink_dump_start_rcu(struct sock * nlsk,struct sk_buff * skb,const struct nlmsghdr * nlh,struct netlink_dump_control * c)933 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
934 const struct nlmsghdr *nlh,
935 struct netlink_dump_control *c)
936 {
937 int err;
938
939 if (!try_module_get(THIS_MODULE))
940 return -EINVAL;
941
942 rcu_read_unlock();
943 err = netlink_dump_start(nlsk, skb, nlh, c);
944 rcu_read_lock();
945 module_put(THIS_MODULE);
946
947 return err;
948 }
949
950 /* called with rcu_read_lock held */
nf_tables_gettable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])951 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
952 const struct nlattr * const nla[])
953 {
954 struct netlink_ext_ack *extack = info->extack;
955 u8 genmask = nft_genmask_cur(info->net);
956 u8 family = info->nfmsg->nfgen_family;
957 const struct nft_table *table;
958 struct net *net = info->net;
959 struct sk_buff *skb2;
960 int err;
961
962 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
963 struct netlink_dump_control c = {
964 .dump = nf_tables_dump_tables,
965 .module = THIS_MODULE,
966 };
967
968 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
969 }
970
971 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
972 if (IS_ERR(table)) {
973 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
974 return PTR_ERR(table);
975 }
976
977 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
978 if (!skb2)
979 return -ENOMEM;
980
981 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
982 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
983 0, family, table);
984 if (err < 0)
985 goto err_fill_table_info;
986
987 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
988
989 err_fill_table_info:
990 kfree_skb(skb2);
991 return err;
992 }
993
nft_table_disable(struct net * net,struct nft_table * table,u32 cnt)994 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
995 {
996 struct nft_chain *chain;
997 u32 i = 0;
998
999 list_for_each_entry(chain, &table->chains, list) {
1000 if (!nft_is_active_next(net, chain))
1001 continue;
1002 if (!nft_is_base_chain(chain))
1003 continue;
1004
1005 if (cnt && i++ == cnt)
1006 break;
1007
1008 nf_tables_unregister_hook(net, table, chain);
1009 }
1010 }
1011
nf_tables_table_enable(struct net * net,struct nft_table * table)1012 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1013 {
1014 struct nft_chain *chain;
1015 int err, i = 0;
1016
1017 list_for_each_entry(chain, &table->chains, list) {
1018 if (!nft_is_active_next(net, chain))
1019 continue;
1020 if (!nft_is_base_chain(chain))
1021 continue;
1022
1023 err = nf_tables_register_hook(net, table, chain);
1024 if (err < 0)
1025 goto err_register_hooks;
1026
1027 i++;
1028 }
1029 return 0;
1030
1031 err_register_hooks:
1032 if (i)
1033 nft_table_disable(net, table, i);
1034 return err;
1035 }
1036
nf_tables_table_disable(struct net * net,struct nft_table * table)1037 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1038 {
1039 table->flags &= ~NFT_TABLE_F_DORMANT;
1040 nft_table_disable(net, table, 0);
1041 table->flags |= NFT_TABLE_F_DORMANT;
1042 }
1043
1044 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
1045 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
1046 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
1047 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
1048 __NFT_TABLE_F_WAS_AWAKEN)
1049
nf_tables_updtable(struct nft_ctx * ctx)1050 static int nf_tables_updtable(struct nft_ctx *ctx)
1051 {
1052 struct nft_trans *trans;
1053 u32 flags;
1054 int ret;
1055
1056 if (!ctx->nla[NFTA_TABLE_FLAGS])
1057 return 0;
1058
1059 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1060 if (flags & ~NFT_TABLE_F_MASK)
1061 return -EOPNOTSUPP;
1062
1063 if (flags == ctx->table->flags)
1064 return 0;
1065
1066 if ((nft_table_has_owner(ctx->table) &&
1067 !(flags & NFT_TABLE_F_OWNER)) ||
1068 (!nft_table_has_owner(ctx->table) &&
1069 flags & NFT_TABLE_F_OWNER))
1070 return -EOPNOTSUPP;
1071
1072 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1073 sizeof(struct nft_trans_table));
1074 if (trans == NULL)
1075 return -ENOMEM;
1076
1077 if ((flags & NFT_TABLE_F_DORMANT) &&
1078 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1079 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1080 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1081 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1082 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1083 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1084 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1085 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1086 ret = nf_tables_table_enable(ctx->net, ctx->table);
1087 if (ret < 0)
1088 goto err_register_hooks;
1089
1090 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1091 }
1092 }
1093
1094 nft_trans_table_update(trans) = true;
1095 nft_trans_commit_list_add_tail(ctx->net, trans);
1096
1097 return 0;
1098
1099 err_register_hooks:
1100 nft_trans_destroy(trans);
1101 return ret;
1102 }
1103
nft_chain_hash(const void * data,u32 len,u32 seed)1104 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1105 {
1106 const char *name = data;
1107
1108 return jhash(name, strlen(name), seed);
1109 }
1110
nft_chain_hash_obj(const void * data,u32 len,u32 seed)1111 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1112 {
1113 const struct nft_chain *chain = data;
1114
1115 return nft_chain_hash(chain->name, 0, seed);
1116 }
1117
nft_chain_hash_cmp(struct rhashtable_compare_arg * arg,const void * ptr)1118 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1119 const void *ptr)
1120 {
1121 const struct nft_chain *chain = ptr;
1122 const char *name = arg->key;
1123
1124 return strcmp(chain->name, name);
1125 }
1126
nft_objname_hash(const void * data,u32 len,u32 seed)1127 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1128 {
1129 const struct nft_object_hash_key *k = data;
1130
1131 seed ^= hash_ptr(k->table, 32);
1132
1133 return jhash(k->name, strlen(k->name), seed);
1134 }
1135
nft_objname_hash_obj(const void * data,u32 len,u32 seed)1136 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1137 {
1138 const struct nft_object *obj = data;
1139
1140 return nft_objname_hash(&obj->key, 0, seed);
1141 }
1142
nft_objname_hash_cmp(struct rhashtable_compare_arg * arg,const void * ptr)1143 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1144 const void *ptr)
1145 {
1146 const struct nft_object_hash_key *k = arg->key;
1147 const struct nft_object *obj = ptr;
1148
1149 if (obj->key.table != k->table)
1150 return -1;
1151
1152 return strcmp(obj->key.name, k->name);
1153 }
1154
nft_supported_family(u8 family)1155 static bool nft_supported_family(u8 family)
1156 {
1157 return false
1158 #ifdef CONFIG_NF_TABLES_INET
1159 || family == NFPROTO_INET
1160 #endif
1161 #ifdef CONFIG_NF_TABLES_IPV4
1162 || family == NFPROTO_IPV4
1163 #endif
1164 #ifdef CONFIG_NF_TABLES_ARP
1165 || family == NFPROTO_ARP
1166 #endif
1167 #ifdef CONFIG_NF_TABLES_NETDEV
1168 || family == NFPROTO_NETDEV
1169 #endif
1170 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1171 || family == NFPROTO_BRIDGE
1172 #endif
1173 #ifdef CONFIG_NF_TABLES_IPV6
1174 || family == NFPROTO_IPV6
1175 #endif
1176 ;
1177 }
1178
nf_tables_newtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])1179 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1180 const struct nlattr * const nla[])
1181 {
1182 struct nftables_pernet *nft_net = nft_pernet(info->net);
1183 struct netlink_ext_ack *extack = info->extack;
1184 u8 genmask = nft_genmask_next(info->net);
1185 u8 family = info->nfmsg->nfgen_family;
1186 struct net *net = info->net;
1187 const struct nlattr *attr;
1188 struct nft_table *table;
1189 struct nft_ctx ctx;
1190 u32 flags = 0;
1191 int err;
1192
1193 if (!nft_supported_family(family))
1194 return -EOPNOTSUPP;
1195
1196 lockdep_assert_held(&nft_net->commit_mutex);
1197 attr = nla[NFTA_TABLE_NAME];
1198 table = nft_table_lookup(net, attr, family, genmask,
1199 NETLINK_CB(skb).portid);
1200 if (IS_ERR(table)) {
1201 if (PTR_ERR(table) != -ENOENT)
1202 return PTR_ERR(table);
1203 } else {
1204 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1205 NL_SET_BAD_ATTR(extack, attr);
1206 return -EEXIST;
1207 }
1208 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1209 return -EOPNOTSUPP;
1210
1211 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1212
1213 return nf_tables_updtable(&ctx);
1214 }
1215
1216 if (nla[NFTA_TABLE_FLAGS]) {
1217 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1218 if (flags & ~NFT_TABLE_F_MASK)
1219 return -EOPNOTSUPP;
1220 }
1221
1222 err = -ENOMEM;
1223 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1224 if (table == NULL)
1225 goto err_kzalloc;
1226
1227 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1228 if (table->name == NULL)
1229 goto err_strdup;
1230
1231 if (nla[NFTA_TABLE_USERDATA]) {
1232 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1233 if (table->udata == NULL)
1234 goto err_table_udata;
1235
1236 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1237 }
1238
1239 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1240 if (err)
1241 goto err_chain_ht;
1242
1243 INIT_LIST_HEAD(&table->chains);
1244 INIT_LIST_HEAD(&table->sets);
1245 INIT_LIST_HEAD(&table->objects);
1246 INIT_LIST_HEAD(&table->flowtables);
1247 table->family = family;
1248 table->flags = flags;
1249 table->handle = ++nft_net->table_handle;
1250 if (table->flags & NFT_TABLE_F_OWNER)
1251 table->nlpid = NETLINK_CB(skb).portid;
1252
1253 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1254 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1255 if (err < 0)
1256 goto err_trans;
1257
1258 list_add_tail_rcu(&table->list, &nft_net->tables);
1259 return 0;
1260 err_trans:
1261 rhltable_destroy(&table->chains_ht);
1262 err_chain_ht:
1263 kfree(table->udata);
1264 err_table_udata:
1265 kfree(table->name);
1266 err_strdup:
1267 kfree(table);
1268 err_kzalloc:
1269 return err;
1270 }
1271
nft_flush_table(struct nft_ctx * ctx)1272 static int nft_flush_table(struct nft_ctx *ctx)
1273 {
1274 struct nft_flowtable *flowtable, *nft;
1275 struct nft_chain *chain, *nc;
1276 struct nft_object *obj, *ne;
1277 struct nft_set *set, *ns;
1278 int err;
1279
1280 list_for_each_entry(chain, &ctx->table->chains, list) {
1281 if (!nft_is_active_next(ctx->net, chain))
1282 continue;
1283
1284 if (nft_chain_is_bound(chain))
1285 continue;
1286
1287 ctx->chain = chain;
1288
1289 err = nft_delrule_by_chain(ctx);
1290 if (err < 0)
1291 goto out;
1292 }
1293
1294 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1295 if (!nft_is_active_next(ctx->net, set))
1296 continue;
1297
1298 if (nft_set_is_anonymous(set) &&
1299 !list_empty(&set->bindings))
1300 continue;
1301
1302 err = nft_delset(ctx, set);
1303 if (err < 0)
1304 goto out;
1305 }
1306
1307 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1308 if (!nft_is_active_next(ctx->net, flowtable))
1309 continue;
1310
1311 err = nft_delflowtable(ctx, flowtable);
1312 if (err < 0)
1313 goto out;
1314 }
1315
1316 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1317 if (!nft_is_active_next(ctx->net, obj))
1318 continue;
1319
1320 err = nft_delobj(ctx, obj);
1321 if (err < 0)
1322 goto out;
1323 }
1324
1325 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1326 if (!nft_is_active_next(ctx->net, chain))
1327 continue;
1328
1329 if (nft_chain_is_bound(chain))
1330 continue;
1331
1332 ctx->chain = chain;
1333
1334 err = nft_delchain(ctx);
1335 if (err < 0)
1336 goto out;
1337 }
1338
1339 err = nft_deltable(ctx);
1340 out:
1341 return err;
1342 }
1343
nft_flush(struct nft_ctx * ctx,int family)1344 static int nft_flush(struct nft_ctx *ctx, int family)
1345 {
1346 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1347 const struct nlattr * const *nla = ctx->nla;
1348 struct nft_table *table, *nt;
1349 int err = 0;
1350
1351 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1352 if (family != AF_UNSPEC && table->family != family)
1353 continue;
1354
1355 ctx->family = table->family;
1356
1357 if (!nft_is_active_next(ctx->net, table))
1358 continue;
1359
1360 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1361 continue;
1362
1363 if (nla[NFTA_TABLE_NAME] &&
1364 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1365 continue;
1366
1367 ctx->table = table;
1368
1369 err = nft_flush_table(ctx);
1370 if (err < 0)
1371 goto out;
1372 }
1373 out:
1374 return err;
1375 }
1376
nf_tables_deltable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])1377 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1378 const struct nlattr * const nla[])
1379 {
1380 struct netlink_ext_ack *extack = info->extack;
1381 u8 genmask = nft_genmask_next(info->net);
1382 u8 family = info->nfmsg->nfgen_family;
1383 struct net *net = info->net;
1384 const struct nlattr *attr;
1385 struct nft_table *table;
1386 struct nft_ctx ctx;
1387
1388 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1389 if (family == AF_UNSPEC ||
1390 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1391 return nft_flush(&ctx, family);
1392
1393 if (nla[NFTA_TABLE_HANDLE]) {
1394 attr = nla[NFTA_TABLE_HANDLE];
1395 table = nft_table_lookup_byhandle(net, attr, genmask,
1396 NETLINK_CB(skb).portid);
1397 } else {
1398 attr = nla[NFTA_TABLE_NAME];
1399 table = nft_table_lookup(net, attr, family, genmask,
1400 NETLINK_CB(skb).portid);
1401 }
1402
1403 if (IS_ERR(table)) {
1404 NL_SET_BAD_ATTR(extack, attr);
1405 return PTR_ERR(table);
1406 }
1407
1408 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1409 table->use > 0)
1410 return -EBUSY;
1411
1412 ctx.family = family;
1413 ctx.table = table;
1414
1415 return nft_flush_table(&ctx);
1416 }
1417
nf_tables_table_destroy(struct nft_ctx * ctx)1418 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1419 {
1420 if (WARN_ON(ctx->table->use > 0))
1421 return;
1422
1423 rhltable_destroy(&ctx->table->chains_ht);
1424 kfree(ctx->table->name);
1425 kfree(ctx->table->udata);
1426 kfree(ctx->table);
1427 }
1428
nft_register_chain_type(const struct nft_chain_type * ctype)1429 void nft_register_chain_type(const struct nft_chain_type *ctype)
1430 {
1431 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1432 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1433 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1434 return;
1435 }
1436 chain_type[ctype->family][ctype->type] = ctype;
1437 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1438 }
1439 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1440
nft_unregister_chain_type(const struct nft_chain_type * ctype)1441 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1442 {
1443 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1444 chain_type[ctype->family][ctype->type] = NULL;
1445 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1446 }
1447 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1448
1449 /*
1450 * Chains
1451 */
1452
1453 static struct nft_chain *
nft_chain_lookup_byhandle(const struct nft_table * table,u64 handle,u8 genmask)1454 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1455 {
1456 struct nft_chain *chain;
1457
1458 list_for_each_entry(chain, &table->chains, list) {
1459 if (chain->handle == handle &&
1460 nft_active_genmask(chain, genmask))
1461 return chain;
1462 }
1463
1464 return ERR_PTR(-ENOENT);
1465 }
1466
lockdep_commit_lock_is_held(const struct net * net)1467 static bool lockdep_commit_lock_is_held(const struct net *net)
1468 {
1469 #ifdef CONFIG_PROVE_LOCKING
1470 struct nftables_pernet *nft_net = nft_pernet(net);
1471
1472 return lockdep_is_held(&nft_net->commit_mutex);
1473 #else
1474 return true;
1475 #endif
1476 }
1477
nft_chain_lookup(struct net * net,struct nft_table * table,const struct nlattr * nla,u8 genmask)1478 static struct nft_chain *nft_chain_lookup(struct net *net,
1479 struct nft_table *table,
1480 const struct nlattr *nla, u8 genmask)
1481 {
1482 char search[NFT_CHAIN_MAXNAMELEN + 1];
1483 struct rhlist_head *tmp, *list;
1484 struct nft_chain *chain;
1485
1486 if (nla == NULL)
1487 return ERR_PTR(-EINVAL);
1488
1489 nla_strscpy(search, nla, sizeof(search));
1490
1491 WARN_ON(!rcu_read_lock_held() &&
1492 !lockdep_commit_lock_is_held(net));
1493
1494 chain = ERR_PTR(-ENOENT);
1495 rcu_read_lock();
1496 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1497 if (!list)
1498 goto out_unlock;
1499
1500 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1501 if (nft_active_genmask(chain, genmask))
1502 goto out_unlock;
1503 }
1504 chain = ERR_PTR(-ENOENT);
1505 out_unlock:
1506 rcu_read_unlock();
1507 return chain;
1508 }
1509
1510 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1511 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1512 .len = NFT_TABLE_MAXNAMELEN - 1 },
1513 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1514 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1515 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1516 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1517 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1518 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1519 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1520 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1521 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1522 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1523 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1524 .len = NFT_USERDATA_MAXLEN },
1525 };
1526
1527 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1528 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1529 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1530 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1531 .len = IFNAMSIZ - 1 },
1532 };
1533
nft_dump_stats(struct sk_buff * skb,struct nft_stats __percpu * stats)1534 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1535 {
1536 struct nft_stats *cpu_stats, total;
1537 struct nlattr *nest;
1538 unsigned int seq;
1539 u64 pkts, bytes;
1540 int cpu;
1541
1542 if (!stats)
1543 return 0;
1544
1545 memset(&total, 0, sizeof(total));
1546 for_each_possible_cpu(cpu) {
1547 cpu_stats = per_cpu_ptr(stats, cpu);
1548 do {
1549 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1550 pkts = cpu_stats->pkts;
1551 bytes = cpu_stats->bytes;
1552 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1553 total.pkts += pkts;
1554 total.bytes += bytes;
1555 }
1556 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1557 if (nest == NULL)
1558 goto nla_put_failure;
1559
1560 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1561 NFTA_COUNTER_PAD) ||
1562 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1563 NFTA_COUNTER_PAD))
1564 goto nla_put_failure;
1565
1566 nla_nest_end(skb, nest);
1567 return 0;
1568
1569 nla_put_failure:
1570 return -ENOSPC;
1571 }
1572
nft_dump_basechain_hook(struct sk_buff * skb,int family,const struct nft_base_chain * basechain)1573 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1574 const struct nft_base_chain *basechain)
1575 {
1576 const struct nf_hook_ops *ops = &basechain->ops;
1577 struct nft_hook *hook, *first = NULL;
1578 struct nlattr *nest, *nest_devs;
1579 int n = 0;
1580
1581 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1582 if (nest == NULL)
1583 goto nla_put_failure;
1584 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1585 goto nla_put_failure;
1586 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1587 goto nla_put_failure;
1588
1589 if (nft_base_chain_netdev(family, ops->hooknum)) {
1590 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1591 list_for_each_entry(hook, &basechain->hook_list, list) {
1592 if (!first)
1593 first = hook;
1594
1595 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1596 hook->ops.dev->name))
1597 goto nla_put_failure;
1598 n++;
1599 }
1600 nla_nest_end(skb, nest_devs);
1601
1602 if (n == 1 &&
1603 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1604 goto nla_put_failure;
1605 }
1606 nla_nest_end(skb, nest);
1607
1608 return 0;
1609 nla_put_failure:
1610 return -1;
1611 }
1612
nf_tables_fill_chain_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,int event,u32 flags,int family,const struct nft_table * table,const struct nft_chain * chain)1613 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1614 u32 portid, u32 seq, int event, u32 flags,
1615 int family, const struct nft_table *table,
1616 const struct nft_chain *chain)
1617 {
1618 struct nlmsghdr *nlh;
1619
1620 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1621 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1622 NFNETLINK_V0, nft_base_seq(net));
1623 if (!nlh)
1624 goto nla_put_failure;
1625
1626 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1627 goto nla_put_failure;
1628 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1629 NFTA_CHAIN_PAD))
1630 goto nla_put_failure;
1631 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1632 goto nla_put_failure;
1633
1634 if (nft_is_base_chain(chain)) {
1635 const struct nft_base_chain *basechain = nft_base_chain(chain);
1636 struct nft_stats __percpu *stats;
1637
1638 if (nft_dump_basechain_hook(skb, family, basechain))
1639 goto nla_put_failure;
1640
1641 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1642 htonl(basechain->policy)))
1643 goto nla_put_failure;
1644
1645 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1646 goto nla_put_failure;
1647
1648 stats = rcu_dereference_check(basechain->stats,
1649 lockdep_commit_lock_is_held(net));
1650 if (nft_dump_stats(skb, stats))
1651 goto nla_put_failure;
1652 }
1653
1654 if (chain->flags &&
1655 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1656 goto nla_put_failure;
1657
1658 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1659 goto nla_put_failure;
1660
1661 if (chain->udata &&
1662 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1663 goto nla_put_failure;
1664
1665 nlmsg_end(skb, nlh);
1666 return 0;
1667
1668 nla_put_failure:
1669 nlmsg_trim(skb, nlh);
1670 return -1;
1671 }
1672
nf_tables_chain_notify(const struct nft_ctx * ctx,int event)1673 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1674 {
1675 struct nftables_pernet *nft_net;
1676 struct sk_buff *skb;
1677 u16 flags = 0;
1678 int err;
1679
1680 if (!ctx->report &&
1681 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1682 return;
1683
1684 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1685 if (skb == NULL)
1686 goto err;
1687
1688 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1689 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1690
1691 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1692 event, flags, ctx->family, ctx->table,
1693 ctx->chain);
1694 if (err < 0) {
1695 kfree_skb(skb);
1696 goto err;
1697 }
1698
1699 nft_net = nft_pernet(ctx->net);
1700 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1701 return;
1702 err:
1703 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1704 }
1705
nf_tables_dump_chains(struct sk_buff * skb,struct netlink_callback * cb)1706 static int nf_tables_dump_chains(struct sk_buff *skb,
1707 struct netlink_callback *cb)
1708 {
1709 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1710 unsigned int idx = 0, s_idx = cb->args[0];
1711 struct net *net = sock_net(skb->sk);
1712 int family = nfmsg->nfgen_family;
1713 struct nftables_pernet *nft_net;
1714 const struct nft_table *table;
1715 const struct nft_chain *chain;
1716
1717 rcu_read_lock();
1718 nft_net = nft_pernet(net);
1719 cb->seq = READ_ONCE(nft_net->base_seq);
1720
1721 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1722 if (family != NFPROTO_UNSPEC && family != table->family)
1723 continue;
1724
1725 list_for_each_entry_rcu(chain, &table->chains, list) {
1726 if (idx < s_idx)
1727 goto cont;
1728 if (idx > s_idx)
1729 memset(&cb->args[1], 0,
1730 sizeof(cb->args) - sizeof(cb->args[0]));
1731 if (!nft_is_active(net, chain))
1732 continue;
1733 if (nf_tables_fill_chain_info(skb, net,
1734 NETLINK_CB(cb->skb).portid,
1735 cb->nlh->nlmsg_seq,
1736 NFT_MSG_NEWCHAIN,
1737 NLM_F_MULTI,
1738 table->family, table,
1739 chain) < 0)
1740 goto done;
1741
1742 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1743 cont:
1744 idx++;
1745 }
1746 }
1747 done:
1748 rcu_read_unlock();
1749 cb->args[0] = idx;
1750 return skb->len;
1751 }
1752
1753 /* called with rcu_read_lock held */
nf_tables_getchain(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])1754 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1755 const struct nlattr * const nla[])
1756 {
1757 struct netlink_ext_ack *extack = info->extack;
1758 u8 genmask = nft_genmask_cur(info->net);
1759 u8 family = info->nfmsg->nfgen_family;
1760 const struct nft_chain *chain;
1761 struct net *net = info->net;
1762 struct nft_table *table;
1763 struct sk_buff *skb2;
1764 int err;
1765
1766 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1767 struct netlink_dump_control c = {
1768 .dump = nf_tables_dump_chains,
1769 .module = THIS_MODULE,
1770 };
1771
1772 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1773 }
1774
1775 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1776 if (IS_ERR(table)) {
1777 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1778 return PTR_ERR(table);
1779 }
1780
1781 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1782 if (IS_ERR(chain)) {
1783 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1784 return PTR_ERR(chain);
1785 }
1786
1787 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1788 if (!skb2)
1789 return -ENOMEM;
1790
1791 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1792 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1793 0, family, table, chain);
1794 if (err < 0)
1795 goto err_fill_chain_info;
1796
1797 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1798
1799 err_fill_chain_info:
1800 kfree_skb(skb2);
1801 return err;
1802 }
1803
1804 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1805 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1806 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1807 };
1808
nft_stats_alloc(const struct nlattr * attr)1809 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1810 {
1811 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1812 struct nft_stats __percpu *newstats;
1813 struct nft_stats *stats;
1814 int err;
1815
1816 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1817 nft_counter_policy, NULL);
1818 if (err < 0)
1819 return ERR_PTR(err);
1820
1821 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1822 return ERR_PTR(-EINVAL);
1823
1824 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1825 if (newstats == NULL)
1826 return ERR_PTR(-ENOMEM);
1827
1828 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1829 * are not exposed to userspace.
1830 */
1831 preempt_disable();
1832 stats = this_cpu_ptr(newstats);
1833 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1834 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1835 preempt_enable();
1836
1837 return newstats;
1838 }
1839
nft_chain_stats_replace(struct nft_trans * trans)1840 static void nft_chain_stats_replace(struct nft_trans *trans)
1841 {
1842 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1843
1844 if (!nft_trans_chain_stats(trans))
1845 return;
1846
1847 nft_trans_chain_stats(trans) =
1848 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1849 lockdep_commit_lock_is_held(trans->ctx.net));
1850
1851 if (!nft_trans_chain_stats(trans))
1852 static_branch_inc(&nft_counters_enabled);
1853 }
1854
nf_tables_chain_free_chain_rules(struct nft_chain * chain)1855 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1856 {
1857 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1858 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1859
1860 if (g0 != g1)
1861 kvfree(g1);
1862 kvfree(g0);
1863
1864 /* should be NULL either via abort or via successful commit */
1865 WARN_ON_ONCE(chain->blob_next);
1866 kvfree(chain->blob_next);
1867 }
1868
nf_tables_chain_destroy(struct nft_ctx * ctx)1869 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1870 {
1871 struct nft_chain *chain = ctx->chain;
1872 struct nft_hook *hook, *next;
1873
1874 if (WARN_ON(chain->use > 0))
1875 return;
1876
1877 /* no concurrent access possible anymore */
1878 nf_tables_chain_free_chain_rules(chain);
1879
1880 if (nft_is_base_chain(chain)) {
1881 struct nft_base_chain *basechain = nft_base_chain(chain);
1882
1883 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1884 list_for_each_entry_safe(hook, next,
1885 &basechain->hook_list, list) {
1886 list_del_rcu(&hook->list);
1887 kfree_rcu(hook, rcu);
1888 }
1889 }
1890 module_put(basechain->type->owner);
1891 if (rcu_access_pointer(basechain->stats)) {
1892 static_branch_dec(&nft_counters_enabled);
1893 free_percpu(rcu_dereference_raw(basechain->stats));
1894 }
1895 kfree(chain->name);
1896 kfree(chain->udata);
1897 kfree(basechain);
1898 } else {
1899 kfree(chain->name);
1900 kfree(chain->udata);
1901 kfree(chain);
1902 }
1903 }
1904
nft_netdev_hook_alloc(struct net * net,const struct nlattr * attr)1905 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1906 const struct nlattr *attr)
1907 {
1908 struct net_device *dev;
1909 char ifname[IFNAMSIZ];
1910 struct nft_hook *hook;
1911 int err;
1912
1913 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
1914 if (!hook) {
1915 err = -ENOMEM;
1916 goto err_hook_alloc;
1917 }
1918
1919 nla_strscpy(ifname, attr, IFNAMSIZ);
1920 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1921 * indirectly serializing all the other holders of the commit_mutex with
1922 * the rtnl_mutex.
1923 */
1924 dev = __dev_get_by_name(net, ifname);
1925 if (!dev) {
1926 err = -ENOENT;
1927 goto err_hook_dev;
1928 }
1929 hook->ops.dev = dev;
1930
1931 return hook;
1932
1933 err_hook_dev:
1934 kfree(hook);
1935 err_hook_alloc:
1936 return ERR_PTR(err);
1937 }
1938
nft_hook_list_find(struct list_head * hook_list,const struct nft_hook * this)1939 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1940 const struct nft_hook *this)
1941 {
1942 struct nft_hook *hook;
1943
1944 list_for_each_entry(hook, hook_list, list) {
1945 if (this->ops.dev == hook->ops.dev)
1946 return hook;
1947 }
1948
1949 return NULL;
1950 }
1951
nf_tables_parse_netdev_hooks(struct net * net,const struct nlattr * attr,struct list_head * hook_list)1952 static int nf_tables_parse_netdev_hooks(struct net *net,
1953 const struct nlattr *attr,
1954 struct list_head *hook_list)
1955 {
1956 struct nft_hook *hook, *next;
1957 const struct nlattr *tmp;
1958 int rem, n = 0, err;
1959
1960 nla_for_each_nested(tmp, attr, rem) {
1961 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1962 err = -EINVAL;
1963 goto err_hook;
1964 }
1965
1966 hook = nft_netdev_hook_alloc(net, tmp);
1967 if (IS_ERR(hook)) {
1968 err = PTR_ERR(hook);
1969 goto err_hook;
1970 }
1971 if (nft_hook_list_find(hook_list, hook)) {
1972 kfree(hook);
1973 err = -EEXIST;
1974 goto err_hook;
1975 }
1976 list_add_tail(&hook->list, hook_list);
1977 n++;
1978
1979 if (n == NFT_NETDEVICE_MAX) {
1980 err = -EFBIG;
1981 goto err_hook;
1982 }
1983 }
1984
1985 return 0;
1986
1987 err_hook:
1988 list_for_each_entry_safe(hook, next, hook_list, list) {
1989 list_del(&hook->list);
1990 kfree(hook);
1991 }
1992 return err;
1993 }
1994
1995 struct nft_chain_hook {
1996 u32 num;
1997 s32 priority;
1998 const struct nft_chain_type *type;
1999 struct list_head list;
2000 };
2001
nft_chain_parse_netdev(struct net * net,struct nlattr * tb[],struct list_head * hook_list)2002 static int nft_chain_parse_netdev(struct net *net,
2003 struct nlattr *tb[],
2004 struct list_head *hook_list)
2005 {
2006 struct nft_hook *hook;
2007 int err;
2008
2009 if (tb[NFTA_HOOK_DEV]) {
2010 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2011 if (IS_ERR(hook))
2012 return PTR_ERR(hook);
2013
2014 list_add_tail(&hook->list, hook_list);
2015 } else if (tb[NFTA_HOOK_DEVS]) {
2016 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2017 hook_list);
2018 if (err < 0)
2019 return err;
2020
2021 if (list_empty(hook_list))
2022 return -EINVAL;
2023 } else {
2024 return -EINVAL;
2025 }
2026
2027 return 0;
2028 }
2029
nft_chain_parse_hook(struct net * net,const struct nlattr * const nla[],struct nft_chain_hook * hook,u8 family,struct netlink_ext_ack * extack,bool autoload)2030 static int nft_chain_parse_hook(struct net *net,
2031 const struct nlattr * const nla[],
2032 struct nft_chain_hook *hook, u8 family,
2033 struct netlink_ext_ack *extack, bool autoload)
2034 {
2035 struct nftables_pernet *nft_net = nft_pernet(net);
2036 struct nlattr *ha[NFTA_HOOK_MAX + 1];
2037 const struct nft_chain_type *type;
2038 int err;
2039
2040 lockdep_assert_held(&nft_net->commit_mutex);
2041 lockdep_nfnl_nft_mutex_not_held();
2042
2043 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2044 nla[NFTA_CHAIN_HOOK],
2045 nft_hook_policy, NULL);
2046 if (err < 0)
2047 return err;
2048
2049 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
2050 ha[NFTA_HOOK_PRIORITY] == NULL)
2051 return -EINVAL;
2052
2053 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2054 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2055
2056 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2057 if (!type)
2058 return -EOPNOTSUPP;
2059
2060 if (nla[NFTA_CHAIN_TYPE]) {
2061 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2062 family, autoload);
2063 if (IS_ERR(type)) {
2064 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2065 return PTR_ERR(type);
2066 }
2067 }
2068 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2069 return -EOPNOTSUPP;
2070
2071 if (type->type == NFT_CHAIN_T_NAT &&
2072 hook->priority <= NF_IP_PRI_CONNTRACK)
2073 return -EOPNOTSUPP;
2074
2075 if (!try_module_get(type->owner)) {
2076 if (nla[NFTA_CHAIN_TYPE])
2077 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2078 return -ENOENT;
2079 }
2080
2081 hook->type = type;
2082
2083 INIT_LIST_HEAD(&hook->list);
2084 if (nft_base_chain_netdev(family, hook->num)) {
2085 err = nft_chain_parse_netdev(net, ha, &hook->list);
2086 if (err < 0) {
2087 module_put(type->owner);
2088 return err;
2089 }
2090 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2091 module_put(type->owner);
2092 return -EOPNOTSUPP;
2093 }
2094
2095 return 0;
2096 }
2097
nft_chain_release_hook(struct nft_chain_hook * hook)2098 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2099 {
2100 struct nft_hook *h, *next;
2101
2102 list_for_each_entry_safe(h, next, &hook->list, list) {
2103 list_del(&h->list);
2104 kfree(h);
2105 }
2106 module_put(hook->type->owner);
2107 }
2108
2109 struct nft_rules_old {
2110 struct rcu_head h;
2111 struct nft_rule_blob *blob;
2112 };
2113
nft_last_rule(struct nft_rule_blob * blob,const void * ptr)2114 static void nft_last_rule(struct nft_rule_blob *blob, const void *ptr)
2115 {
2116 struct nft_rule_dp *prule;
2117
2118 prule = (struct nft_rule_dp *)ptr;
2119 prule->is_last = 1;
2120 /* blob size does not include the trailer rule */
2121 }
2122
nf_tables_chain_alloc_rules(unsigned int size)2123 static struct nft_rule_blob *nf_tables_chain_alloc_rules(unsigned int size)
2124 {
2125 struct nft_rule_blob *blob;
2126
2127 /* size must include room for the last rule */
2128 if (size < offsetof(struct nft_rule_dp, data))
2129 return NULL;
2130
2131 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rules_old);
2132 if (size > INT_MAX)
2133 return NULL;
2134
2135 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2136 if (!blob)
2137 return NULL;
2138
2139 blob->size = 0;
2140 nft_last_rule(blob, blob->data);
2141
2142 return blob;
2143 }
2144
nft_basechain_hook_init(struct nf_hook_ops * ops,u8 family,const struct nft_chain_hook * hook,struct nft_chain * chain)2145 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2146 const struct nft_chain_hook *hook,
2147 struct nft_chain *chain)
2148 {
2149 ops->pf = family;
2150 ops->hooknum = hook->num;
2151 ops->priority = hook->priority;
2152 ops->priv = chain;
2153 ops->hook = hook->type->hooks[ops->hooknum];
2154 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2155 }
2156
nft_basechain_init(struct nft_base_chain * basechain,u8 family,struct nft_chain_hook * hook,u32 flags)2157 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2158 struct nft_chain_hook *hook, u32 flags)
2159 {
2160 struct nft_chain *chain;
2161 struct nft_hook *h;
2162
2163 basechain->type = hook->type;
2164 INIT_LIST_HEAD(&basechain->hook_list);
2165 chain = &basechain->chain;
2166
2167 if (nft_base_chain_netdev(family, hook->num)) {
2168 list_splice_init(&hook->list, &basechain->hook_list);
2169 list_for_each_entry(h, &basechain->hook_list, list)
2170 nft_basechain_hook_init(&h->ops, family, hook, chain);
2171
2172 basechain->ops.hooknum = hook->num;
2173 basechain->ops.priority = hook->priority;
2174 } else {
2175 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2176 }
2177
2178 chain->flags |= NFT_CHAIN_BASE | flags;
2179 basechain->policy = NF_ACCEPT;
2180 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2181 !nft_chain_offload_support(basechain)) {
2182 list_splice_init(&basechain->hook_list, &hook->list);
2183 return -EOPNOTSUPP;
2184 }
2185
2186 flow_block_init(&basechain->flow_block);
2187
2188 return 0;
2189 }
2190
nft_chain_add(struct nft_table * table,struct nft_chain * chain)2191 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2192 {
2193 int err;
2194
2195 err = rhltable_insert_key(&table->chains_ht, chain->name,
2196 &chain->rhlhead, nft_chain_ht_params);
2197 if (err)
2198 return err;
2199
2200 list_add_tail_rcu(&chain->list, &table->chains);
2201
2202 return 0;
2203 }
2204
2205 static u64 chain_id;
2206
nf_tables_addchain(struct nft_ctx * ctx,u8 family,u8 genmask,u8 policy,u32 flags,struct netlink_ext_ack * extack)2207 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2208 u8 policy, u32 flags,
2209 struct netlink_ext_ack *extack)
2210 {
2211 const struct nlattr * const *nla = ctx->nla;
2212 struct nft_table *table = ctx->table;
2213 struct nft_base_chain *basechain;
2214 struct net *net = ctx->net;
2215 char name[NFT_NAME_MAXLEN];
2216 struct nft_rule_blob *blob;
2217 struct nft_trans *trans;
2218 struct nft_chain *chain;
2219 unsigned int data_size;
2220 int err;
2221
2222 if (table->use == UINT_MAX)
2223 return -EOVERFLOW;
2224
2225 if (nla[NFTA_CHAIN_HOOK]) {
2226 struct nft_stats __percpu *stats = NULL;
2227 struct nft_chain_hook hook;
2228
2229 if (flags & NFT_CHAIN_BINDING)
2230 return -EOPNOTSUPP;
2231
2232 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2233 true);
2234 if (err < 0)
2235 return err;
2236
2237 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2238 if (basechain == NULL) {
2239 nft_chain_release_hook(&hook);
2240 return -ENOMEM;
2241 }
2242 chain = &basechain->chain;
2243
2244 if (nla[NFTA_CHAIN_COUNTERS]) {
2245 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2246 if (IS_ERR(stats)) {
2247 nft_chain_release_hook(&hook);
2248 kfree(basechain);
2249 return PTR_ERR(stats);
2250 }
2251 rcu_assign_pointer(basechain->stats, stats);
2252 }
2253
2254 err = nft_basechain_init(basechain, family, &hook, flags);
2255 if (err < 0) {
2256 nft_chain_release_hook(&hook);
2257 kfree(basechain);
2258 free_percpu(stats);
2259 return err;
2260 }
2261 if (stats)
2262 static_branch_inc(&nft_counters_enabled);
2263 } else {
2264 if (flags & NFT_CHAIN_BASE)
2265 return -EINVAL;
2266 if (flags & NFT_CHAIN_HW_OFFLOAD)
2267 return -EOPNOTSUPP;
2268
2269 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2270 if (chain == NULL)
2271 return -ENOMEM;
2272
2273 chain->flags = flags;
2274 }
2275 ctx->chain = chain;
2276
2277 INIT_LIST_HEAD(&chain->rules);
2278 chain->handle = nf_tables_alloc_handle(table);
2279 chain->table = table;
2280
2281 if (nla[NFTA_CHAIN_NAME]) {
2282 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2283 } else {
2284 if (!(flags & NFT_CHAIN_BINDING)) {
2285 err = -EINVAL;
2286 goto err_destroy_chain;
2287 }
2288
2289 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2290 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2291 }
2292
2293 if (!chain->name) {
2294 err = -ENOMEM;
2295 goto err_destroy_chain;
2296 }
2297
2298 if (nla[NFTA_CHAIN_USERDATA]) {
2299 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2300 if (chain->udata == NULL) {
2301 err = -ENOMEM;
2302 goto err_destroy_chain;
2303 }
2304 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2305 }
2306
2307 data_size = offsetof(struct nft_rule_dp, data); /* last rule */
2308 blob = nf_tables_chain_alloc_rules(data_size);
2309 if (!blob) {
2310 err = -ENOMEM;
2311 goto err_destroy_chain;
2312 }
2313
2314 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2315 RCU_INIT_POINTER(chain->blob_gen_1, blob);
2316
2317 err = nf_tables_register_hook(net, table, chain);
2318 if (err < 0)
2319 goto err_destroy_chain;
2320
2321 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2322 if (IS_ERR(trans)) {
2323 err = PTR_ERR(trans);
2324 goto err_unregister_hook;
2325 }
2326
2327 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2328 if (nft_is_base_chain(chain))
2329 nft_trans_chain_policy(trans) = policy;
2330
2331 err = nft_chain_add(table, chain);
2332 if (err < 0) {
2333 nft_trans_destroy(trans);
2334 goto err_unregister_hook;
2335 }
2336
2337 table->use++;
2338
2339 return 0;
2340 err_unregister_hook:
2341 nf_tables_unregister_hook(net, table, chain);
2342 err_destroy_chain:
2343 nf_tables_chain_destroy(ctx);
2344
2345 return err;
2346 }
2347
nft_hook_list_equal(struct list_head * hook_list1,struct list_head * hook_list2)2348 static bool nft_hook_list_equal(struct list_head *hook_list1,
2349 struct list_head *hook_list2)
2350 {
2351 struct nft_hook *hook;
2352 int n = 0, m = 0;
2353
2354 n = 0;
2355 list_for_each_entry(hook, hook_list2, list) {
2356 if (!nft_hook_list_find(hook_list1, hook))
2357 return false;
2358
2359 n++;
2360 }
2361 list_for_each_entry(hook, hook_list1, list)
2362 m++;
2363
2364 return n == m;
2365 }
2366
nf_tables_updchain(struct nft_ctx * ctx,u8 genmask,u8 policy,u32 flags,const struct nlattr * attr,struct netlink_ext_ack * extack)2367 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2368 u32 flags, const struct nlattr *attr,
2369 struct netlink_ext_ack *extack)
2370 {
2371 const struct nlattr * const *nla = ctx->nla;
2372 struct nft_table *table = ctx->table;
2373 struct nft_chain *chain = ctx->chain;
2374 struct nft_base_chain *basechain;
2375 struct nft_stats *stats = NULL;
2376 struct nft_chain_hook hook;
2377 struct nf_hook_ops *ops;
2378 struct nft_trans *trans;
2379 int err;
2380
2381 if (chain->flags ^ flags)
2382 return -EOPNOTSUPP;
2383
2384 if (nla[NFTA_CHAIN_HOOK]) {
2385 if (!nft_is_base_chain(chain)) {
2386 NL_SET_BAD_ATTR(extack, attr);
2387 return -EEXIST;
2388 }
2389 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2390 extack, false);
2391 if (err < 0)
2392 return err;
2393
2394 basechain = nft_base_chain(chain);
2395 if (basechain->type != hook.type) {
2396 nft_chain_release_hook(&hook);
2397 NL_SET_BAD_ATTR(extack, attr);
2398 return -EEXIST;
2399 }
2400
2401 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2402 if (!nft_hook_list_equal(&basechain->hook_list,
2403 &hook.list)) {
2404 nft_chain_release_hook(&hook);
2405 NL_SET_BAD_ATTR(extack, attr);
2406 return -EEXIST;
2407 }
2408 } else {
2409 ops = &basechain->ops;
2410 if (ops->hooknum != hook.num ||
2411 ops->priority != hook.priority) {
2412 nft_chain_release_hook(&hook);
2413 NL_SET_BAD_ATTR(extack, attr);
2414 return -EEXIST;
2415 }
2416 }
2417 nft_chain_release_hook(&hook);
2418 }
2419
2420 if (nla[NFTA_CHAIN_HANDLE] &&
2421 nla[NFTA_CHAIN_NAME]) {
2422 struct nft_chain *chain2;
2423
2424 chain2 = nft_chain_lookup(ctx->net, table,
2425 nla[NFTA_CHAIN_NAME], genmask);
2426 if (!IS_ERR(chain2)) {
2427 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2428 return -EEXIST;
2429 }
2430 }
2431
2432 if (nla[NFTA_CHAIN_COUNTERS]) {
2433 if (!nft_is_base_chain(chain))
2434 return -EOPNOTSUPP;
2435
2436 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2437 if (IS_ERR(stats))
2438 return PTR_ERR(stats);
2439 }
2440
2441 err = -ENOMEM;
2442 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2443 sizeof(struct nft_trans_chain));
2444 if (trans == NULL)
2445 goto err;
2446
2447 nft_trans_chain_stats(trans) = stats;
2448 nft_trans_chain_update(trans) = true;
2449
2450 if (nla[NFTA_CHAIN_POLICY])
2451 nft_trans_chain_policy(trans) = policy;
2452 else
2453 nft_trans_chain_policy(trans) = -1;
2454
2455 if (nla[NFTA_CHAIN_HANDLE] &&
2456 nla[NFTA_CHAIN_NAME]) {
2457 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2458 struct nft_trans *tmp;
2459 char *name;
2460
2461 err = -ENOMEM;
2462 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2463 if (!name)
2464 goto err;
2465
2466 err = -EEXIST;
2467 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2468 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2469 tmp->ctx.table == table &&
2470 nft_trans_chain_update(tmp) &&
2471 nft_trans_chain_name(tmp) &&
2472 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2473 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2474 kfree(name);
2475 goto err;
2476 }
2477 }
2478
2479 nft_trans_chain_name(trans) = name;
2480 }
2481 nft_trans_commit_list_add_tail(ctx->net, trans);
2482
2483 return 0;
2484 err:
2485 free_percpu(stats);
2486 kfree(trans);
2487 return err;
2488 }
2489
nft_chain_lookup_byid(const struct net * net,const struct nft_table * table,const struct nlattr * nla)2490 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2491 const struct nft_table *table,
2492 const struct nlattr *nla)
2493 {
2494 struct nftables_pernet *nft_net = nft_pernet(net);
2495 u32 id = ntohl(nla_get_be32(nla));
2496 struct nft_trans *trans;
2497
2498 list_for_each_entry(trans, &nft_net->commit_list, list) {
2499 struct nft_chain *chain = trans->ctx.chain;
2500
2501 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2502 chain->table == table &&
2503 id == nft_trans_chain_id(trans))
2504 return chain;
2505 }
2506 return ERR_PTR(-ENOENT);
2507 }
2508
nf_tables_newchain(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])2509 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2510 const struct nlattr * const nla[])
2511 {
2512 struct nftables_pernet *nft_net = nft_pernet(info->net);
2513 struct netlink_ext_ack *extack = info->extack;
2514 u8 genmask = nft_genmask_next(info->net);
2515 u8 family = info->nfmsg->nfgen_family;
2516 struct nft_chain *chain = NULL;
2517 struct net *net = info->net;
2518 const struct nlattr *attr;
2519 struct nft_table *table;
2520 u8 policy = NF_ACCEPT;
2521 struct nft_ctx ctx;
2522 u64 handle = 0;
2523 u32 flags = 0;
2524
2525 lockdep_assert_held(&nft_net->commit_mutex);
2526
2527 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2528 NETLINK_CB(skb).portid);
2529 if (IS_ERR(table)) {
2530 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2531 return PTR_ERR(table);
2532 }
2533
2534 chain = NULL;
2535 attr = nla[NFTA_CHAIN_NAME];
2536
2537 if (nla[NFTA_CHAIN_HANDLE]) {
2538 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2539 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2540 if (IS_ERR(chain)) {
2541 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2542 return PTR_ERR(chain);
2543 }
2544 attr = nla[NFTA_CHAIN_HANDLE];
2545 } else if (nla[NFTA_CHAIN_NAME]) {
2546 chain = nft_chain_lookup(net, table, attr, genmask);
2547 if (IS_ERR(chain)) {
2548 if (PTR_ERR(chain) != -ENOENT) {
2549 NL_SET_BAD_ATTR(extack, attr);
2550 return PTR_ERR(chain);
2551 }
2552 chain = NULL;
2553 }
2554 } else if (!nla[NFTA_CHAIN_ID]) {
2555 return -EINVAL;
2556 }
2557
2558 if (nla[NFTA_CHAIN_POLICY]) {
2559 if (chain != NULL &&
2560 !nft_is_base_chain(chain)) {
2561 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2562 return -EOPNOTSUPP;
2563 }
2564
2565 if (chain == NULL &&
2566 nla[NFTA_CHAIN_HOOK] == NULL) {
2567 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2568 return -EOPNOTSUPP;
2569 }
2570
2571 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2572 switch (policy) {
2573 case NF_DROP:
2574 case NF_ACCEPT:
2575 break;
2576 default:
2577 return -EINVAL;
2578 }
2579 }
2580
2581 if (nla[NFTA_CHAIN_FLAGS])
2582 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2583 else if (chain)
2584 flags = chain->flags;
2585
2586 if (flags & ~NFT_CHAIN_FLAGS)
2587 return -EOPNOTSUPP;
2588
2589 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2590
2591 if (chain != NULL) {
2592 if (chain->flags & NFT_CHAIN_BINDING)
2593 return -EINVAL;
2594
2595 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2596 NL_SET_BAD_ATTR(extack, attr);
2597 return -EEXIST;
2598 }
2599 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2600 return -EOPNOTSUPP;
2601
2602 flags |= chain->flags & NFT_CHAIN_BASE;
2603 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2604 extack);
2605 }
2606
2607 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2608 }
2609
nf_tables_delchain(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])2610 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2611 const struct nlattr * const nla[])
2612 {
2613 struct netlink_ext_ack *extack = info->extack;
2614 u8 genmask = nft_genmask_next(info->net);
2615 u8 family = info->nfmsg->nfgen_family;
2616 struct net *net = info->net;
2617 const struct nlattr *attr;
2618 struct nft_table *table;
2619 struct nft_chain *chain;
2620 struct nft_rule *rule;
2621 struct nft_ctx ctx;
2622 u64 handle;
2623 u32 use;
2624 int err;
2625
2626 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2627 NETLINK_CB(skb).portid);
2628 if (IS_ERR(table)) {
2629 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2630 return PTR_ERR(table);
2631 }
2632
2633 if (nla[NFTA_CHAIN_HANDLE]) {
2634 attr = nla[NFTA_CHAIN_HANDLE];
2635 handle = be64_to_cpu(nla_get_be64(attr));
2636 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2637 } else {
2638 attr = nla[NFTA_CHAIN_NAME];
2639 chain = nft_chain_lookup(net, table, attr, genmask);
2640 }
2641 if (IS_ERR(chain)) {
2642 NL_SET_BAD_ATTR(extack, attr);
2643 return PTR_ERR(chain);
2644 }
2645
2646 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2647 chain->use > 0)
2648 return -EBUSY;
2649
2650 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2651
2652 use = chain->use;
2653 list_for_each_entry(rule, &chain->rules, list) {
2654 if (!nft_is_active_next(net, rule))
2655 continue;
2656 use--;
2657
2658 err = nft_delrule(&ctx, rule);
2659 if (err < 0)
2660 return err;
2661 }
2662
2663 /* There are rules and elements that are still holding references to us,
2664 * we cannot do a recursive removal in this case.
2665 */
2666 if (use > 0) {
2667 NL_SET_BAD_ATTR(extack, attr);
2668 return -EBUSY;
2669 }
2670
2671 return nft_delchain(&ctx);
2672 }
2673
2674 /*
2675 * Expressions
2676 */
2677
2678 /**
2679 * nft_register_expr - register nf_tables expr type
2680 * @type: expr type
2681 *
2682 * Registers the expr type for use with nf_tables. Returns zero on
2683 * success or a negative errno code otherwise.
2684 */
nft_register_expr(struct nft_expr_type * type)2685 int nft_register_expr(struct nft_expr_type *type)
2686 {
2687 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2688 if (type->family == NFPROTO_UNSPEC)
2689 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2690 else
2691 list_add_rcu(&type->list, &nf_tables_expressions);
2692 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2693 return 0;
2694 }
2695 EXPORT_SYMBOL_GPL(nft_register_expr);
2696
2697 /**
2698 * nft_unregister_expr - unregister nf_tables expr type
2699 * @type: expr type
2700 *
2701 * Unregisters the expr typefor use with nf_tables.
2702 */
nft_unregister_expr(struct nft_expr_type * type)2703 void nft_unregister_expr(struct nft_expr_type *type)
2704 {
2705 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2706 list_del_rcu(&type->list);
2707 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2708 }
2709 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2710
__nft_expr_type_get(u8 family,struct nlattr * nla)2711 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2712 struct nlattr *nla)
2713 {
2714 const struct nft_expr_type *type, *candidate = NULL;
2715
2716 list_for_each_entry(type, &nf_tables_expressions, list) {
2717 if (!nla_strcmp(nla, type->name)) {
2718 if (!type->family && !candidate)
2719 candidate = type;
2720 else if (type->family == family)
2721 candidate = type;
2722 }
2723 }
2724 return candidate;
2725 }
2726
2727 #ifdef CONFIG_MODULES
nft_expr_type_request_module(struct net * net,u8 family,struct nlattr * nla)2728 static int nft_expr_type_request_module(struct net *net, u8 family,
2729 struct nlattr *nla)
2730 {
2731 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2732 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2733 return -EAGAIN;
2734
2735 return 0;
2736 }
2737 #endif
2738
nft_expr_type_get(struct net * net,u8 family,struct nlattr * nla)2739 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2740 u8 family,
2741 struct nlattr *nla)
2742 {
2743 const struct nft_expr_type *type;
2744
2745 if (nla == NULL)
2746 return ERR_PTR(-EINVAL);
2747
2748 type = __nft_expr_type_get(family, nla);
2749 if (type != NULL && try_module_get(type->owner))
2750 return type;
2751
2752 lockdep_nfnl_nft_mutex_not_held();
2753 #ifdef CONFIG_MODULES
2754 if (type == NULL) {
2755 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2756 return ERR_PTR(-EAGAIN);
2757
2758 if (nft_request_module(net, "nft-expr-%.*s",
2759 nla_len(nla),
2760 (char *)nla_data(nla)) == -EAGAIN)
2761 return ERR_PTR(-EAGAIN);
2762 }
2763 #endif
2764 return ERR_PTR(-ENOENT);
2765 }
2766
2767 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2768 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2769 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2770 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2771 };
2772
nf_tables_fill_expr_info(struct sk_buff * skb,const struct nft_expr * expr)2773 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2774 const struct nft_expr *expr)
2775 {
2776 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2777 goto nla_put_failure;
2778
2779 if (expr->ops->dump) {
2780 struct nlattr *data = nla_nest_start_noflag(skb,
2781 NFTA_EXPR_DATA);
2782 if (data == NULL)
2783 goto nla_put_failure;
2784 if (expr->ops->dump(skb, expr) < 0)
2785 goto nla_put_failure;
2786 nla_nest_end(skb, data);
2787 }
2788
2789 return skb->len;
2790
2791 nla_put_failure:
2792 return -1;
2793 };
2794
nft_expr_dump(struct sk_buff * skb,unsigned int attr,const struct nft_expr * expr)2795 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2796 const struct nft_expr *expr)
2797 {
2798 struct nlattr *nest;
2799
2800 nest = nla_nest_start_noflag(skb, attr);
2801 if (!nest)
2802 goto nla_put_failure;
2803 if (nf_tables_fill_expr_info(skb, expr) < 0)
2804 goto nla_put_failure;
2805 nla_nest_end(skb, nest);
2806 return 0;
2807
2808 nla_put_failure:
2809 return -1;
2810 }
2811
2812 struct nft_expr_info {
2813 const struct nft_expr_ops *ops;
2814 const struct nlattr *attr;
2815 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2816 };
2817
nf_tables_expr_parse(const struct nft_ctx * ctx,const struct nlattr * nla,struct nft_expr_info * info)2818 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2819 const struct nlattr *nla,
2820 struct nft_expr_info *info)
2821 {
2822 const struct nft_expr_type *type;
2823 const struct nft_expr_ops *ops;
2824 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2825 int err;
2826
2827 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2828 nft_expr_policy, NULL);
2829 if (err < 0)
2830 return err;
2831
2832 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2833 if (IS_ERR(type))
2834 return PTR_ERR(type);
2835
2836 if (tb[NFTA_EXPR_DATA]) {
2837 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2838 tb[NFTA_EXPR_DATA],
2839 type->policy, NULL);
2840 if (err < 0)
2841 goto err1;
2842 } else
2843 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2844
2845 if (type->select_ops != NULL) {
2846 ops = type->select_ops(ctx,
2847 (const struct nlattr * const *)info->tb);
2848 if (IS_ERR(ops)) {
2849 err = PTR_ERR(ops);
2850 #ifdef CONFIG_MODULES
2851 if (err == -EAGAIN)
2852 if (nft_expr_type_request_module(ctx->net,
2853 ctx->family,
2854 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2855 err = -ENOENT;
2856 #endif
2857 goto err1;
2858 }
2859 } else
2860 ops = type->ops;
2861
2862 info->attr = nla;
2863 info->ops = ops;
2864
2865 return 0;
2866
2867 err1:
2868 module_put(type->owner);
2869 return err;
2870 }
2871
nf_tables_newexpr(const struct nft_ctx * ctx,const struct nft_expr_info * expr_info,struct nft_expr * expr)2872 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2873 const struct nft_expr_info *expr_info,
2874 struct nft_expr *expr)
2875 {
2876 const struct nft_expr_ops *ops = expr_info->ops;
2877 int err;
2878
2879 expr->ops = ops;
2880 if (ops->init) {
2881 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2882 if (err < 0)
2883 goto err1;
2884 }
2885
2886 return 0;
2887 err1:
2888 expr->ops = NULL;
2889 return err;
2890 }
2891
nf_tables_expr_destroy(const struct nft_ctx * ctx,struct nft_expr * expr)2892 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2893 struct nft_expr *expr)
2894 {
2895 const struct nft_expr_type *type = expr->ops->type;
2896
2897 if (expr->ops->destroy)
2898 expr->ops->destroy(ctx, expr);
2899 module_put(type->owner);
2900 }
2901
nft_expr_init(const struct nft_ctx * ctx,const struct nlattr * nla)2902 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2903 const struct nlattr *nla)
2904 {
2905 struct nft_expr_info expr_info;
2906 struct nft_expr *expr;
2907 struct module *owner;
2908 int err;
2909
2910 err = nf_tables_expr_parse(ctx, nla, &expr_info);
2911 if (err < 0)
2912 goto err_expr_parse;
2913
2914 err = -EOPNOTSUPP;
2915 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2916 goto err_expr_stateful;
2917
2918 err = -ENOMEM;
2919 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
2920 if (expr == NULL)
2921 goto err_expr_stateful;
2922
2923 err = nf_tables_newexpr(ctx, &expr_info, expr);
2924 if (err < 0)
2925 goto err_expr_new;
2926
2927 return expr;
2928 err_expr_new:
2929 kfree(expr);
2930 err_expr_stateful:
2931 owner = expr_info.ops->type->owner;
2932 if (expr_info.ops->type->release_ops)
2933 expr_info.ops->type->release_ops(expr_info.ops);
2934
2935 module_put(owner);
2936 err_expr_parse:
2937 return ERR_PTR(err);
2938 }
2939
nft_expr_clone(struct nft_expr * dst,struct nft_expr * src)2940 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2941 {
2942 int err;
2943
2944 if (src->ops->clone) {
2945 dst->ops = src->ops;
2946 err = src->ops->clone(dst, src);
2947 if (err < 0)
2948 return err;
2949 } else {
2950 memcpy(dst, src, src->ops->size);
2951 }
2952
2953 __module_get(src->ops->type->owner);
2954
2955 return 0;
2956 }
2957
nft_expr_destroy(const struct nft_ctx * ctx,struct nft_expr * expr)2958 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2959 {
2960 nf_tables_expr_destroy(ctx, expr);
2961 kfree(expr);
2962 }
2963
2964 /*
2965 * Rules
2966 */
2967
__nft_rule_lookup(const struct nft_chain * chain,u64 handle)2968 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2969 u64 handle)
2970 {
2971 struct nft_rule *rule;
2972
2973 // FIXME: this sucks
2974 list_for_each_entry_rcu(rule, &chain->rules, list) {
2975 if (handle == rule->handle)
2976 return rule;
2977 }
2978
2979 return ERR_PTR(-ENOENT);
2980 }
2981
nft_rule_lookup(const struct nft_chain * chain,const struct nlattr * nla)2982 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2983 const struct nlattr *nla)
2984 {
2985 if (nla == NULL)
2986 return ERR_PTR(-EINVAL);
2987
2988 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2989 }
2990
2991 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2992 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2993 .len = NFT_TABLE_MAXNAMELEN - 1 },
2994 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2995 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2996 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2997 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2998 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2999 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
3000 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
3001 .len = NFT_USERDATA_MAXLEN },
3002 [NFTA_RULE_ID] = { .type = NLA_U32 },
3003 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3004 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
3005 };
3006
nf_tables_fill_rule_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,int event,u32 flags,int family,const struct nft_table * table,const struct nft_chain * chain,const struct nft_rule * rule,u64 handle)3007 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3008 u32 portid, u32 seq, int event,
3009 u32 flags, int family,
3010 const struct nft_table *table,
3011 const struct nft_chain *chain,
3012 const struct nft_rule *rule, u64 handle)
3013 {
3014 struct nlmsghdr *nlh;
3015 const struct nft_expr *expr, *next;
3016 struct nlattr *list;
3017 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3018
3019 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3020 nft_base_seq(net));
3021 if (!nlh)
3022 goto nla_put_failure;
3023
3024 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3025 goto nla_put_failure;
3026 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3027 goto nla_put_failure;
3028 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3029 NFTA_RULE_PAD))
3030 goto nla_put_failure;
3031
3032 if (event != NFT_MSG_DELRULE && handle) {
3033 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3034 NFTA_RULE_PAD))
3035 goto nla_put_failure;
3036 }
3037
3038 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3039 nft_flow_rule_stats(chain, rule);
3040
3041 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3042 if (list == NULL)
3043 goto nla_put_failure;
3044 nft_rule_for_each_expr(expr, next, rule) {
3045 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
3046 goto nla_put_failure;
3047 }
3048 nla_nest_end(skb, list);
3049
3050 if (rule->udata) {
3051 struct nft_userdata *udata = nft_userdata(rule);
3052 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3053 udata->data) < 0)
3054 goto nla_put_failure;
3055 }
3056
3057 nlmsg_end(skb, nlh);
3058 return 0;
3059
3060 nla_put_failure:
3061 nlmsg_trim(skb, nlh);
3062 return -1;
3063 }
3064
nf_tables_rule_notify(const struct nft_ctx * ctx,const struct nft_rule * rule,int event)3065 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3066 const struct nft_rule *rule, int event)
3067 {
3068 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3069 const struct nft_rule *prule;
3070 struct sk_buff *skb;
3071 u64 handle = 0;
3072 u16 flags = 0;
3073 int err;
3074
3075 if (!ctx->report &&
3076 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3077 return;
3078
3079 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3080 if (skb == NULL)
3081 goto err;
3082
3083 if (event == NFT_MSG_NEWRULE &&
3084 !list_is_first(&rule->list, &ctx->chain->rules) &&
3085 !list_is_last(&rule->list, &ctx->chain->rules)) {
3086 prule = list_prev_entry(rule, list);
3087 handle = prule->handle;
3088 }
3089 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3090 flags |= NLM_F_APPEND;
3091 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3092 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3093
3094 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3095 event, flags, ctx->family, ctx->table,
3096 ctx->chain, rule, handle);
3097 if (err < 0) {
3098 kfree_skb(skb);
3099 goto err;
3100 }
3101
3102 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3103 return;
3104 err:
3105 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3106 }
3107
3108 struct nft_rule_dump_ctx {
3109 char *table;
3110 char *chain;
3111 };
3112
__nf_tables_dump_rules(struct sk_buff * skb,unsigned int * idx,struct netlink_callback * cb,const struct nft_table * table,const struct nft_chain * chain)3113 static int __nf_tables_dump_rules(struct sk_buff *skb,
3114 unsigned int *idx,
3115 struct netlink_callback *cb,
3116 const struct nft_table *table,
3117 const struct nft_chain *chain)
3118 {
3119 struct net *net = sock_net(skb->sk);
3120 const struct nft_rule *rule, *prule;
3121 unsigned int s_idx = cb->args[0];
3122 u64 handle;
3123
3124 prule = NULL;
3125 list_for_each_entry_rcu(rule, &chain->rules, list) {
3126 if (!nft_is_active(net, rule))
3127 goto cont_skip;
3128 if (*idx < s_idx)
3129 goto cont;
3130 if (*idx > s_idx) {
3131 memset(&cb->args[1], 0,
3132 sizeof(cb->args) - sizeof(cb->args[0]));
3133 }
3134 if (prule)
3135 handle = prule->handle;
3136 else
3137 handle = 0;
3138
3139 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3140 cb->nlh->nlmsg_seq,
3141 NFT_MSG_NEWRULE,
3142 NLM_F_MULTI | NLM_F_APPEND,
3143 table->family,
3144 table, chain, rule, handle) < 0)
3145 return 1;
3146
3147 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3148 cont:
3149 prule = rule;
3150 cont_skip:
3151 (*idx)++;
3152 }
3153 return 0;
3154 }
3155
nf_tables_dump_rules(struct sk_buff * skb,struct netlink_callback * cb)3156 static int nf_tables_dump_rules(struct sk_buff *skb,
3157 struct netlink_callback *cb)
3158 {
3159 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3160 const struct nft_rule_dump_ctx *ctx = cb->data;
3161 struct nft_table *table;
3162 const struct nft_chain *chain;
3163 unsigned int idx = 0;
3164 struct net *net = sock_net(skb->sk);
3165 int family = nfmsg->nfgen_family;
3166 struct nftables_pernet *nft_net;
3167
3168 rcu_read_lock();
3169 nft_net = nft_pernet(net);
3170 cb->seq = READ_ONCE(nft_net->base_seq);
3171
3172 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3173 if (family != NFPROTO_UNSPEC && family != table->family)
3174 continue;
3175
3176 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3177 continue;
3178
3179 if (ctx && ctx->table && ctx->chain) {
3180 struct rhlist_head *list, *tmp;
3181
3182 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3183 nft_chain_ht_params);
3184 if (!list)
3185 goto done;
3186
3187 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3188 if (!nft_is_active(net, chain))
3189 continue;
3190 __nf_tables_dump_rules(skb, &idx,
3191 cb, table, chain);
3192 break;
3193 }
3194 goto done;
3195 }
3196
3197 list_for_each_entry_rcu(chain, &table->chains, list) {
3198 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3199 goto done;
3200 }
3201
3202 if (ctx && ctx->table)
3203 break;
3204 }
3205 done:
3206 rcu_read_unlock();
3207
3208 cb->args[0] = idx;
3209 return skb->len;
3210 }
3211
nf_tables_dump_rules_start(struct netlink_callback * cb)3212 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3213 {
3214 const struct nlattr * const *nla = cb->data;
3215 struct nft_rule_dump_ctx *ctx = NULL;
3216
3217 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3218 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3219 if (!ctx)
3220 return -ENOMEM;
3221
3222 if (nla[NFTA_RULE_TABLE]) {
3223 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3224 GFP_ATOMIC);
3225 if (!ctx->table) {
3226 kfree(ctx);
3227 return -ENOMEM;
3228 }
3229 }
3230 if (nla[NFTA_RULE_CHAIN]) {
3231 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3232 GFP_ATOMIC);
3233 if (!ctx->chain) {
3234 kfree(ctx->table);
3235 kfree(ctx);
3236 return -ENOMEM;
3237 }
3238 }
3239 }
3240
3241 cb->data = ctx;
3242 return 0;
3243 }
3244
nf_tables_dump_rules_done(struct netlink_callback * cb)3245 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3246 {
3247 struct nft_rule_dump_ctx *ctx = cb->data;
3248
3249 if (ctx) {
3250 kfree(ctx->table);
3251 kfree(ctx->chain);
3252 kfree(ctx);
3253 }
3254 return 0;
3255 }
3256
3257 /* called with rcu_read_lock held */
nf_tables_getrule(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])3258 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3259 const struct nlattr * const nla[])
3260 {
3261 struct netlink_ext_ack *extack = info->extack;
3262 u8 genmask = nft_genmask_cur(info->net);
3263 u8 family = info->nfmsg->nfgen_family;
3264 const struct nft_chain *chain;
3265 const struct nft_rule *rule;
3266 struct net *net = info->net;
3267 struct nft_table *table;
3268 struct sk_buff *skb2;
3269 int err;
3270
3271 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3272 struct netlink_dump_control c = {
3273 .start= nf_tables_dump_rules_start,
3274 .dump = nf_tables_dump_rules,
3275 .done = nf_tables_dump_rules_done,
3276 .module = THIS_MODULE,
3277 .data = (void *)nla,
3278 };
3279
3280 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3281 }
3282
3283 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3284 if (IS_ERR(table)) {
3285 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3286 return PTR_ERR(table);
3287 }
3288
3289 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3290 if (IS_ERR(chain)) {
3291 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3292 return PTR_ERR(chain);
3293 }
3294
3295 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3296 if (IS_ERR(rule)) {
3297 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3298 return PTR_ERR(rule);
3299 }
3300
3301 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3302 if (!skb2)
3303 return -ENOMEM;
3304
3305 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3306 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3307 family, table, chain, rule, 0);
3308 if (err < 0)
3309 goto err_fill_rule_info;
3310
3311 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3312
3313 err_fill_rule_info:
3314 kfree_skb(skb2);
3315 return err;
3316 }
3317
nf_tables_rule_destroy(const struct nft_ctx * ctx,struct nft_rule * rule)3318 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3319 struct nft_rule *rule)
3320 {
3321 struct nft_expr *expr, *next;
3322
3323 /*
3324 * Careful: some expressions might not be initialized in case this
3325 * is called on error from nf_tables_newrule().
3326 */
3327 expr = nft_expr_first(rule);
3328 while (nft_expr_more(rule, expr)) {
3329 next = nft_expr_next(expr);
3330 nf_tables_expr_destroy(ctx, expr);
3331 expr = next;
3332 }
3333 kfree(rule);
3334 }
3335
nf_tables_rule_release(const struct nft_ctx * ctx,struct nft_rule * rule)3336 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3337 {
3338 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3339 nf_tables_rule_destroy(ctx, rule);
3340 }
3341
nft_chain_validate(const struct nft_ctx * ctx,const struct nft_chain * chain)3342 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3343 {
3344 struct nft_expr *expr, *last;
3345 const struct nft_data *data;
3346 struct nft_rule *rule;
3347 int err;
3348
3349 if (ctx->level == NFT_JUMP_STACK_SIZE)
3350 return -EMLINK;
3351
3352 list_for_each_entry(rule, &chain->rules, list) {
3353 if (!nft_is_active_next(ctx->net, rule))
3354 continue;
3355
3356 nft_rule_for_each_expr(expr, last, rule) {
3357 if (!expr->ops->validate)
3358 continue;
3359
3360 err = expr->ops->validate(ctx, expr, &data);
3361 if (err < 0)
3362 return err;
3363 }
3364
3365 cond_resched();
3366 }
3367
3368 return 0;
3369 }
3370 EXPORT_SYMBOL_GPL(nft_chain_validate);
3371
nft_table_validate(struct net * net,const struct nft_table * table)3372 static int nft_table_validate(struct net *net, const struct nft_table *table)
3373 {
3374 struct nft_chain *chain;
3375 struct nft_ctx ctx = {
3376 .net = net,
3377 .family = table->family,
3378 };
3379 int err;
3380
3381 list_for_each_entry(chain, &table->chains, list) {
3382 if (!nft_is_base_chain(chain))
3383 continue;
3384
3385 ctx.chain = chain;
3386 err = nft_chain_validate(&ctx, chain);
3387 if (err < 0)
3388 return err;
3389 }
3390
3391 return 0;
3392 }
3393
3394 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3395 const struct nft_chain *chain,
3396 const struct nlattr *nla);
3397
3398 #define NFT_RULE_MAXEXPRS 128
3399
nf_tables_newrule(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])3400 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3401 const struct nlattr * const nla[])
3402 {
3403 struct nftables_pernet *nft_net = nft_pernet(info->net);
3404 struct netlink_ext_ack *extack = info->extack;
3405 unsigned int size, i, n, ulen = 0, usize = 0;
3406 u8 genmask = nft_genmask_next(info->net);
3407 struct nft_rule *rule, *old_rule = NULL;
3408 struct nft_expr_info *expr_info = NULL;
3409 u8 family = info->nfmsg->nfgen_family;
3410 struct nft_flow_rule *flow = NULL;
3411 struct net *net = info->net;
3412 struct nft_userdata *udata;
3413 struct nft_table *table;
3414 struct nft_chain *chain;
3415 struct nft_trans *trans;
3416 u64 handle, pos_handle;
3417 struct nft_expr *expr;
3418 struct nft_ctx ctx;
3419 struct nlattr *tmp;
3420 int err, rem;
3421
3422 lockdep_assert_held(&nft_net->commit_mutex);
3423
3424 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3425 NETLINK_CB(skb).portid);
3426 if (IS_ERR(table)) {
3427 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3428 return PTR_ERR(table);
3429 }
3430
3431 if (nla[NFTA_RULE_CHAIN]) {
3432 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3433 genmask);
3434 if (IS_ERR(chain)) {
3435 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3436 return PTR_ERR(chain);
3437 }
3438 if (nft_chain_is_bound(chain))
3439 return -EOPNOTSUPP;
3440
3441 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3442 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3443 if (IS_ERR(chain)) {
3444 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3445 return PTR_ERR(chain);
3446 }
3447 } else {
3448 return -EINVAL;
3449 }
3450
3451 if (nla[NFTA_RULE_HANDLE]) {
3452 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3453 rule = __nft_rule_lookup(chain, handle);
3454 if (IS_ERR(rule)) {
3455 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3456 return PTR_ERR(rule);
3457 }
3458
3459 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3460 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3461 return -EEXIST;
3462 }
3463 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3464 old_rule = rule;
3465 else
3466 return -EOPNOTSUPP;
3467 } else {
3468 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3469 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3470 return -EINVAL;
3471 handle = nf_tables_alloc_handle(table);
3472
3473 if (chain->use == UINT_MAX)
3474 return -EOVERFLOW;
3475
3476 if (nla[NFTA_RULE_POSITION]) {
3477 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3478 old_rule = __nft_rule_lookup(chain, pos_handle);
3479 if (IS_ERR(old_rule)) {
3480 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3481 return PTR_ERR(old_rule);
3482 }
3483 } else if (nla[NFTA_RULE_POSITION_ID]) {
3484 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3485 if (IS_ERR(old_rule)) {
3486 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3487 return PTR_ERR(old_rule);
3488 }
3489 }
3490 }
3491
3492 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3493
3494 n = 0;
3495 size = 0;
3496 if (nla[NFTA_RULE_EXPRESSIONS]) {
3497 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3498 sizeof(struct nft_expr_info),
3499 GFP_KERNEL);
3500 if (!expr_info)
3501 return -ENOMEM;
3502
3503 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3504 err = -EINVAL;
3505 if (nla_type(tmp) != NFTA_LIST_ELEM)
3506 goto err_release_expr;
3507 if (n == NFT_RULE_MAXEXPRS)
3508 goto err_release_expr;
3509 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3510 if (err < 0) {
3511 NL_SET_BAD_ATTR(extack, tmp);
3512 goto err_release_expr;
3513 }
3514 size += expr_info[n].ops->size;
3515 n++;
3516 }
3517 }
3518 /* Check for overflow of dlen field */
3519 err = -EFBIG;
3520 if (size >= 1 << 12)
3521 goto err_release_expr;
3522
3523 if (nla[NFTA_RULE_USERDATA]) {
3524 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3525 if (ulen > 0)
3526 usize = sizeof(struct nft_userdata) + ulen;
3527 }
3528
3529 err = -ENOMEM;
3530 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3531 if (rule == NULL)
3532 goto err_release_expr;
3533
3534 nft_activate_next(net, rule);
3535
3536 rule->handle = handle;
3537 rule->dlen = size;
3538 rule->udata = ulen ? 1 : 0;
3539
3540 if (ulen) {
3541 udata = nft_userdata(rule);
3542 udata->len = ulen - 1;
3543 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3544 }
3545
3546 expr = nft_expr_first(rule);
3547 for (i = 0; i < n; i++) {
3548 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3549 if (err < 0) {
3550 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3551 goto err_release_rule;
3552 }
3553
3554 if (expr_info[i].ops->validate)
3555 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3556
3557 expr_info[i].ops = NULL;
3558 expr = nft_expr_next(expr);
3559 }
3560
3561 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3562 flow = nft_flow_rule_create(net, rule);
3563 if (IS_ERR(flow)) {
3564 err = PTR_ERR(flow);
3565 goto err_release_rule;
3566 }
3567 }
3568
3569 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3570 err = nft_delrule(&ctx, old_rule);
3571 if (err < 0)
3572 goto err_destroy_flow_rule;
3573
3574 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3575 if (trans == NULL) {
3576 err = -ENOMEM;
3577 goto err_destroy_flow_rule;
3578 }
3579 list_add_tail_rcu(&rule->list, &old_rule->list);
3580 } else {
3581 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3582 if (!trans) {
3583 err = -ENOMEM;
3584 goto err_destroy_flow_rule;
3585 }
3586
3587 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3588 if (old_rule)
3589 list_add_rcu(&rule->list, &old_rule->list);
3590 else
3591 list_add_tail_rcu(&rule->list, &chain->rules);
3592 } else {
3593 if (old_rule)
3594 list_add_tail_rcu(&rule->list, &old_rule->list);
3595 else
3596 list_add_rcu(&rule->list, &chain->rules);
3597 }
3598 }
3599 kvfree(expr_info);
3600 chain->use++;
3601
3602 if (flow)
3603 nft_trans_flow_rule(trans) = flow;
3604
3605 if (nft_net->validate_state == NFT_VALIDATE_DO)
3606 return nft_table_validate(net, table);
3607
3608 return 0;
3609
3610 err_destroy_flow_rule:
3611 if (flow)
3612 nft_flow_rule_destroy(flow);
3613 err_release_rule:
3614 nf_tables_rule_release(&ctx, rule);
3615 err_release_expr:
3616 for (i = 0; i < n; i++) {
3617 if (expr_info[i].ops) {
3618 module_put(expr_info[i].ops->type->owner);
3619 if (expr_info[i].ops->type->release_ops)
3620 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3621 }
3622 }
3623 kvfree(expr_info);
3624
3625 return err;
3626 }
3627
nft_rule_lookup_byid(const struct net * net,const struct nft_chain * chain,const struct nlattr * nla)3628 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3629 const struct nft_chain *chain,
3630 const struct nlattr *nla)
3631 {
3632 struct nftables_pernet *nft_net = nft_pernet(net);
3633 u32 id = ntohl(nla_get_be32(nla));
3634 struct nft_trans *trans;
3635
3636 list_for_each_entry(trans, &nft_net->commit_list, list) {
3637 struct nft_rule *rule = nft_trans_rule(trans);
3638
3639 if (trans->msg_type == NFT_MSG_NEWRULE &&
3640 trans->ctx.chain == chain &&
3641 id == nft_trans_rule_id(trans))
3642 return rule;
3643 }
3644 return ERR_PTR(-ENOENT);
3645 }
3646
nf_tables_delrule(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])3647 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3648 const struct nlattr * const nla[])
3649 {
3650 struct netlink_ext_ack *extack = info->extack;
3651 u8 genmask = nft_genmask_next(info->net);
3652 u8 family = info->nfmsg->nfgen_family;
3653 struct nft_chain *chain = NULL;
3654 struct net *net = info->net;
3655 struct nft_table *table;
3656 struct nft_rule *rule;
3657 struct nft_ctx ctx;
3658 int err = 0;
3659
3660 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3661 NETLINK_CB(skb).portid);
3662 if (IS_ERR(table)) {
3663 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3664 return PTR_ERR(table);
3665 }
3666
3667 if (nla[NFTA_RULE_CHAIN]) {
3668 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3669 genmask);
3670 if (IS_ERR(chain)) {
3671 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3672 return PTR_ERR(chain);
3673 }
3674 if (nft_chain_is_bound(chain))
3675 return -EOPNOTSUPP;
3676 }
3677
3678 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3679
3680 if (chain) {
3681 if (nla[NFTA_RULE_HANDLE]) {
3682 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3683 if (IS_ERR(rule)) {
3684 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3685 return PTR_ERR(rule);
3686 }
3687
3688 err = nft_delrule(&ctx, rule);
3689 } else if (nla[NFTA_RULE_ID]) {
3690 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3691 if (IS_ERR(rule)) {
3692 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3693 return PTR_ERR(rule);
3694 }
3695
3696 err = nft_delrule(&ctx, rule);
3697 } else {
3698 err = nft_delrule_by_chain(&ctx);
3699 }
3700 } else {
3701 list_for_each_entry(chain, &table->chains, list) {
3702 if (!nft_is_active_next(net, chain))
3703 continue;
3704
3705 ctx.chain = chain;
3706 err = nft_delrule_by_chain(&ctx);
3707 if (err < 0)
3708 break;
3709 }
3710 }
3711
3712 return err;
3713 }
3714
3715 /*
3716 * Sets
3717 */
3718 static const struct nft_set_type *nft_set_types[] = {
3719 &nft_set_hash_fast_type,
3720 &nft_set_hash_type,
3721 &nft_set_rhash_type,
3722 &nft_set_bitmap_type,
3723 &nft_set_rbtree_type,
3724 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3725 &nft_set_pipapo_avx2_type,
3726 #endif
3727 &nft_set_pipapo_type,
3728 };
3729
3730 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
3731 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3732 NFT_SET_EVAL)
3733
nft_set_ops_candidate(const struct nft_set_type * type,u32 flags)3734 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3735 {
3736 return (flags & type->features) == (flags & NFT_SET_FEATURES);
3737 }
3738
3739 /*
3740 * Select a set implementation based on the data characteristics and the
3741 * given policy. The total memory use might not be known if no size is
3742 * given, in that case the amount of memory per element is used.
3743 */
3744 static const struct nft_set_ops *
nft_select_set_ops(const struct nft_ctx * ctx,const struct nlattr * const nla[],const struct nft_set_desc * desc)3745 nft_select_set_ops(const struct nft_ctx *ctx,
3746 const struct nlattr * const nla[],
3747 const struct nft_set_desc *desc)
3748 {
3749 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3750 const struct nft_set_ops *ops, *bops;
3751 struct nft_set_estimate est, best;
3752 const struct nft_set_type *type;
3753 u32 flags = 0;
3754 int i;
3755
3756 lockdep_assert_held(&nft_net->commit_mutex);
3757 lockdep_nfnl_nft_mutex_not_held();
3758
3759 if (nla[NFTA_SET_FLAGS] != NULL)
3760 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3761
3762 bops = NULL;
3763 best.size = ~0;
3764 best.lookup = ~0;
3765 best.space = ~0;
3766
3767 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3768 type = nft_set_types[i];
3769 ops = &type->ops;
3770
3771 if (!nft_set_ops_candidate(type, flags))
3772 continue;
3773 if (!ops->estimate(desc, flags, &est))
3774 continue;
3775
3776 switch (desc->policy) {
3777 case NFT_SET_POL_PERFORMANCE:
3778 if (est.lookup < best.lookup)
3779 break;
3780 if (est.lookup == best.lookup &&
3781 est.space < best.space)
3782 break;
3783 continue;
3784 case NFT_SET_POL_MEMORY:
3785 if (!desc->size) {
3786 if (est.space < best.space)
3787 break;
3788 if (est.space == best.space &&
3789 est.lookup < best.lookup)
3790 break;
3791 } else if (est.size < best.size || !bops) {
3792 break;
3793 }
3794 continue;
3795 default:
3796 break;
3797 }
3798
3799 bops = ops;
3800 best = est;
3801 }
3802
3803 if (bops != NULL)
3804 return bops;
3805
3806 return ERR_PTR(-EOPNOTSUPP);
3807 }
3808
3809 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3810 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3811 .len = NFT_TABLE_MAXNAMELEN - 1 },
3812 [NFTA_SET_NAME] = { .type = NLA_STRING,
3813 .len = NFT_SET_MAXNAMELEN - 1 },
3814 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3815 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3816 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3817 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3818 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3819 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3820 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3821 [NFTA_SET_ID] = { .type = NLA_U32 },
3822 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3823 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3824 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3825 .len = NFT_USERDATA_MAXLEN },
3826 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3827 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3828 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
3829 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
3830 };
3831
3832 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3833 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3834 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
3835 };
3836
nft_set_lookup(const struct nft_table * table,const struct nlattr * nla,u8 genmask)3837 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3838 const struct nlattr *nla, u8 genmask)
3839 {
3840 struct nft_set *set;
3841
3842 if (nla == NULL)
3843 return ERR_PTR(-EINVAL);
3844
3845 list_for_each_entry_rcu(set, &table->sets, list) {
3846 if (!nla_strcmp(nla, set->name) &&
3847 nft_active_genmask(set, genmask))
3848 return set;
3849 }
3850 return ERR_PTR(-ENOENT);
3851 }
3852
nft_set_lookup_byhandle(const struct nft_table * table,const struct nlattr * nla,u8 genmask)3853 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3854 const struct nlattr *nla,
3855 u8 genmask)
3856 {
3857 struct nft_set *set;
3858
3859 list_for_each_entry(set, &table->sets, list) {
3860 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3861 nft_active_genmask(set, genmask))
3862 return set;
3863 }
3864 return ERR_PTR(-ENOENT);
3865 }
3866
nft_set_lookup_byid(const struct net * net,const struct nft_table * table,const struct nlattr * nla,u8 genmask)3867 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3868 const struct nft_table *table,
3869 const struct nlattr *nla, u8 genmask)
3870 {
3871 struct nftables_pernet *nft_net = nft_pernet(net);
3872 u32 id = ntohl(nla_get_be32(nla));
3873 struct nft_trans *trans;
3874
3875 list_for_each_entry(trans, &nft_net->commit_list, list) {
3876 if (trans->msg_type == NFT_MSG_NEWSET) {
3877 struct nft_set *set = nft_trans_set(trans);
3878
3879 if (id == nft_trans_set_id(trans) &&
3880 set->table == table &&
3881 nft_active_genmask(set, genmask))
3882 return set;
3883 }
3884 }
3885 return ERR_PTR(-ENOENT);
3886 }
3887
nft_set_lookup_global(const struct net * net,const struct nft_table * table,const struct nlattr * nla_set_name,const struct nlattr * nla_set_id,u8 genmask)3888 struct nft_set *nft_set_lookup_global(const struct net *net,
3889 const struct nft_table *table,
3890 const struct nlattr *nla_set_name,
3891 const struct nlattr *nla_set_id,
3892 u8 genmask)
3893 {
3894 struct nft_set *set;
3895
3896 set = nft_set_lookup(table, nla_set_name, genmask);
3897 if (IS_ERR(set)) {
3898 if (!nla_set_id)
3899 return set;
3900
3901 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
3902 }
3903 return set;
3904 }
3905 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3906
nf_tables_set_alloc_name(struct nft_ctx * ctx,struct nft_set * set,const char * name)3907 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3908 const char *name)
3909 {
3910 const struct nft_set *i;
3911 const char *p;
3912 unsigned long *inuse;
3913 unsigned int n = 0, min = 0;
3914
3915 p = strchr(name, '%');
3916 if (p != NULL) {
3917 if (p[1] != 'd' || strchr(p + 2, '%'))
3918 return -EINVAL;
3919
3920 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3921 if (inuse == NULL)
3922 return -ENOMEM;
3923 cont:
3924 list_for_each_entry(i, &ctx->table->sets, list) {
3925 int tmp;
3926
3927 if (!nft_is_active_next(ctx->net, i))
3928 continue;
3929 if (!sscanf(i->name, name, &tmp))
3930 continue;
3931 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3932 continue;
3933
3934 set_bit(tmp - min, inuse);
3935 }
3936
3937 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3938 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3939 min += BITS_PER_BYTE * PAGE_SIZE;
3940 memset(inuse, 0, PAGE_SIZE);
3941 goto cont;
3942 }
3943 free_page((unsigned long)inuse);
3944 }
3945
3946 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
3947 if (!set->name)
3948 return -ENOMEM;
3949
3950 list_for_each_entry(i, &ctx->table->sets, list) {
3951 if (!nft_is_active_next(ctx->net, i))
3952 continue;
3953 if (!strcmp(set->name, i->name)) {
3954 kfree(set->name);
3955 set->name = NULL;
3956 return -ENFILE;
3957 }
3958 }
3959 return 0;
3960 }
3961
nf_msecs_to_jiffies64(const struct nlattr * nla,u64 * result)3962 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3963 {
3964 u64 ms = be64_to_cpu(nla_get_be64(nla));
3965 u64 max = (u64)(~((u64)0));
3966
3967 max = div_u64(max, NSEC_PER_MSEC);
3968 if (ms >= max)
3969 return -ERANGE;
3970
3971 ms *= NSEC_PER_MSEC;
3972 *result = nsecs_to_jiffies64(ms);
3973 return 0;
3974 }
3975
nf_jiffies64_to_msecs(u64 input)3976 __be64 nf_jiffies64_to_msecs(u64 input)
3977 {
3978 return cpu_to_be64(jiffies64_to_msecs(input));
3979 }
3980
nf_tables_fill_set_concat(struct sk_buff * skb,const struct nft_set * set)3981 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3982 const struct nft_set *set)
3983 {
3984 struct nlattr *concat, *field;
3985 int i;
3986
3987 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3988 if (!concat)
3989 return -ENOMEM;
3990
3991 for (i = 0; i < set->field_count; i++) {
3992 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3993 if (!field)
3994 return -ENOMEM;
3995
3996 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3997 htonl(set->field_len[i])))
3998 return -ENOMEM;
3999
4000 nla_nest_end(skb, field);
4001 }
4002
4003 nla_nest_end(skb, concat);
4004
4005 return 0;
4006 }
4007
nf_tables_fill_set(struct sk_buff * skb,const struct nft_ctx * ctx,const struct nft_set * set,u16 event,u16 flags)4008 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4009 const struct nft_set *set, u16 event, u16 flags)
4010 {
4011 u64 timeout = READ_ONCE(set->timeout);
4012 u32 gc_int = READ_ONCE(set->gc_int);
4013 u32 portid = ctx->portid;
4014 struct nlmsghdr *nlh;
4015 struct nlattr *nest;
4016 u32 seq = ctx->seq;
4017 int i;
4018
4019 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4020 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4021 NFNETLINK_V0, nft_base_seq(ctx->net));
4022 if (!nlh)
4023 goto nla_put_failure;
4024
4025 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4026 goto nla_put_failure;
4027 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4028 goto nla_put_failure;
4029 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4030 NFTA_SET_PAD))
4031 goto nla_put_failure;
4032 if (set->flags != 0)
4033 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4034 goto nla_put_failure;
4035
4036 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4037 goto nla_put_failure;
4038 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4039 goto nla_put_failure;
4040 if (set->flags & NFT_SET_MAP) {
4041 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4042 goto nla_put_failure;
4043 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4044 goto nla_put_failure;
4045 }
4046 if (set->flags & NFT_SET_OBJECT &&
4047 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4048 goto nla_put_failure;
4049
4050 if (timeout &&
4051 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4052 nf_jiffies64_to_msecs(timeout),
4053 NFTA_SET_PAD))
4054 goto nla_put_failure;
4055 if (gc_int &&
4056 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4057 goto nla_put_failure;
4058
4059 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4060 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4061 goto nla_put_failure;
4062 }
4063
4064 if (set->udata &&
4065 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4066 goto nla_put_failure;
4067
4068 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4069 if (!nest)
4070 goto nla_put_failure;
4071 if (set->size &&
4072 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4073 goto nla_put_failure;
4074
4075 if (set->field_count > 1 &&
4076 nf_tables_fill_set_concat(skb, set))
4077 goto nla_put_failure;
4078
4079 nla_nest_end(skb, nest);
4080
4081 if (set->num_exprs == 1) {
4082 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4083 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
4084 goto nla_put_failure;
4085
4086 nla_nest_end(skb, nest);
4087 } else if (set->num_exprs > 1) {
4088 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4089 if (nest == NULL)
4090 goto nla_put_failure;
4091
4092 for (i = 0; i < set->num_exprs; i++) {
4093 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4094 set->exprs[i]) < 0)
4095 goto nla_put_failure;
4096 }
4097 nla_nest_end(skb, nest);
4098 }
4099
4100 nlmsg_end(skb, nlh);
4101 return 0;
4102
4103 nla_put_failure:
4104 nlmsg_trim(skb, nlh);
4105 return -1;
4106 }
4107
nf_tables_set_notify(const struct nft_ctx * ctx,const struct nft_set * set,int event,gfp_t gfp_flags)4108 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4109 const struct nft_set *set, int event,
4110 gfp_t gfp_flags)
4111 {
4112 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4113 u32 portid = ctx->portid;
4114 struct sk_buff *skb;
4115 u16 flags = 0;
4116 int err;
4117
4118 if (!ctx->report &&
4119 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4120 return;
4121
4122 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4123 if (skb == NULL)
4124 goto err;
4125
4126 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4127 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4128
4129 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4130 if (err < 0) {
4131 kfree_skb(skb);
4132 goto err;
4133 }
4134
4135 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4136 return;
4137 err:
4138 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4139 }
4140
nf_tables_dump_sets(struct sk_buff * skb,struct netlink_callback * cb)4141 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4142 {
4143 const struct nft_set *set;
4144 unsigned int idx, s_idx = cb->args[0];
4145 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4146 struct net *net = sock_net(skb->sk);
4147 struct nft_ctx *ctx = cb->data, ctx_set;
4148 struct nftables_pernet *nft_net;
4149
4150 if (cb->args[1])
4151 return skb->len;
4152
4153 rcu_read_lock();
4154 nft_net = nft_pernet(net);
4155 cb->seq = READ_ONCE(nft_net->base_seq);
4156
4157 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4158 if (ctx->family != NFPROTO_UNSPEC &&
4159 ctx->family != table->family)
4160 continue;
4161
4162 if (ctx->table && ctx->table != table)
4163 continue;
4164
4165 if (cur_table) {
4166 if (cur_table != table)
4167 continue;
4168
4169 cur_table = NULL;
4170 }
4171 idx = 0;
4172 list_for_each_entry_rcu(set, &table->sets, list) {
4173 if (idx < s_idx)
4174 goto cont;
4175 if (!nft_is_active(net, set))
4176 goto cont;
4177
4178 ctx_set = *ctx;
4179 ctx_set.table = table;
4180 ctx_set.family = table->family;
4181
4182 if (nf_tables_fill_set(skb, &ctx_set, set,
4183 NFT_MSG_NEWSET,
4184 NLM_F_MULTI) < 0) {
4185 cb->args[0] = idx;
4186 cb->args[2] = (unsigned long) table;
4187 goto done;
4188 }
4189 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4190 cont:
4191 idx++;
4192 }
4193 if (s_idx)
4194 s_idx = 0;
4195 }
4196 cb->args[1] = 1;
4197 done:
4198 rcu_read_unlock();
4199 return skb->len;
4200 }
4201
nf_tables_dump_sets_start(struct netlink_callback * cb)4202 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4203 {
4204 struct nft_ctx *ctx_dump = NULL;
4205
4206 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4207 if (ctx_dump == NULL)
4208 return -ENOMEM;
4209
4210 cb->data = ctx_dump;
4211 return 0;
4212 }
4213
nf_tables_dump_sets_done(struct netlink_callback * cb)4214 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4215 {
4216 kfree(cb->data);
4217 return 0;
4218 }
4219
4220 /* called with rcu_read_lock held */
nf_tables_getset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])4221 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4222 const struct nlattr * const nla[])
4223 {
4224 struct netlink_ext_ack *extack = info->extack;
4225 u8 genmask = nft_genmask_cur(info->net);
4226 u8 family = info->nfmsg->nfgen_family;
4227 struct nft_table *table = NULL;
4228 struct net *net = info->net;
4229 const struct nft_set *set;
4230 struct sk_buff *skb2;
4231 struct nft_ctx ctx;
4232 int err;
4233
4234 if (nla[NFTA_SET_TABLE]) {
4235 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4236 genmask, 0);
4237 if (IS_ERR(table)) {
4238 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4239 return PTR_ERR(table);
4240 }
4241 }
4242
4243 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4244
4245 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4246 struct netlink_dump_control c = {
4247 .start = nf_tables_dump_sets_start,
4248 .dump = nf_tables_dump_sets,
4249 .done = nf_tables_dump_sets_done,
4250 .data = &ctx,
4251 .module = THIS_MODULE,
4252 };
4253
4254 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4255 }
4256
4257 /* Only accept unspec with dump */
4258 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4259 return -EAFNOSUPPORT;
4260 if (!nla[NFTA_SET_TABLE])
4261 return -EINVAL;
4262
4263 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4264 if (IS_ERR(set))
4265 return PTR_ERR(set);
4266
4267 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4268 if (skb2 == NULL)
4269 return -ENOMEM;
4270
4271 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4272 if (err < 0)
4273 goto err_fill_set_info;
4274
4275 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4276
4277 err_fill_set_info:
4278 kfree_skb(skb2);
4279 return err;
4280 }
4281
4282 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4283 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4284 };
4285
nft_set_desc_concat_parse(const struct nlattr * attr,struct nft_set_desc * desc)4286 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4287 struct nft_set_desc *desc)
4288 {
4289 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4290 u32 len;
4291 int err;
4292
4293 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4294 return -E2BIG;
4295
4296 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4297 nft_concat_policy, NULL);
4298 if (err < 0)
4299 return err;
4300
4301 if (!tb[NFTA_SET_FIELD_LEN])
4302 return -EINVAL;
4303
4304 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4305 if (!len || len > U8_MAX)
4306 return -EINVAL;
4307
4308 desc->field_len[desc->field_count++] = len;
4309
4310 return 0;
4311 }
4312
nft_set_desc_concat(struct nft_set_desc * desc,const struct nlattr * nla)4313 static int nft_set_desc_concat(struct nft_set_desc *desc,
4314 const struct nlattr *nla)
4315 {
4316 struct nlattr *attr;
4317 u32 num_regs = 0;
4318 int rem, err, i;
4319
4320 nla_for_each_nested(attr, nla, rem) {
4321 if (nla_type(attr) != NFTA_LIST_ELEM)
4322 return -EINVAL;
4323
4324 err = nft_set_desc_concat_parse(attr, desc);
4325 if (err < 0)
4326 return err;
4327 }
4328
4329 for (i = 0; i < desc->field_count; i++)
4330 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4331
4332 if (num_regs > NFT_REG32_COUNT)
4333 return -E2BIG;
4334
4335 return 0;
4336 }
4337
nf_tables_set_desc_parse(struct nft_set_desc * desc,const struct nlattr * nla)4338 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4339 const struct nlattr *nla)
4340 {
4341 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4342 int err;
4343
4344 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4345 nft_set_desc_policy, NULL);
4346 if (err < 0)
4347 return err;
4348
4349 if (da[NFTA_SET_DESC_SIZE] != NULL)
4350 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4351 if (da[NFTA_SET_DESC_CONCAT])
4352 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4353
4354 return err;
4355 }
4356
nft_set_expr_alloc(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * const * nla,struct nft_expr ** exprs,int * num_exprs,u32 flags)4357 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4358 const struct nlattr * const *nla,
4359 struct nft_expr **exprs, int *num_exprs,
4360 u32 flags)
4361 {
4362 struct nft_expr *expr;
4363 int err, i;
4364
4365 if (nla[NFTA_SET_EXPR]) {
4366 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4367 if (IS_ERR(expr)) {
4368 err = PTR_ERR(expr);
4369 goto err_set_expr_alloc;
4370 }
4371 exprs[0] = expr;
4372 (*num_exprs)++;
4373 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4374 struct nlattr *tmp;
4375 int left;
4376
4377 if (!(flags & NFT_SET_EXPR)) {
4378 err = -EINVAL;
4379 goto err_set_expr_alloc;
4380 }
4381 i = 0;
4382 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4383 if (i == NFT_SET_EXPR_MAX) {
4384 err = -E2BIG;
4385 goto err_set_expr_alloc;
4386 }
4387 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4388 err = -EINVAL;
4389 goto err_set_expr_alloc;
4390 }
4391 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4392 if (IS_ERR(expr)) {
4393 err = PTR_ERR(expr);
4394 goto err_set_expr_alloc;
4395 }
4396 exprs[i++] = expr;
4397 (*num_exprs)++;
4398 }
4399 }
4400
4401 return 0;
4402
4403 err_set_expr_alloc:
4404 for (i = 0; i < *num_exprs; i++)
4405 nft_expr_destroy(ctx, exprs[i]);
4406
4407 return err;
4408 }
4409
nft_set_is_same(const struct nft_set * set,const struct nft_set_desc * desc,struct nft_expr * exprs[],u32 num_exprs,u32 flags)4410 static bool nft_set_is_same(const struct nft_set *set,
4411 const struct nft_set_desc *desc,
4412 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4413 {
4414 int i;
4415
4416 if (set->ktype != desc->ktype ||
4417 set->dtype != desc->dtype ||
4418 set->flags != flags ||
4419 set->klen != desc->klen ||
4420 set->dlen != desc->dlen ||
4421 set->field_count != desc->field_count ||
4422 set->num_exprs != num_exprs)
4423 return false;
4424
4425 for (i = 0; i < desc->field_count; i++) {
4426 if (set->field_len[i] != desc->field_len[i])
4427 return false;
4428 }
4429
4430 for (i = 0; i < num_exprs; i++) {
4431 if (set->exprs[i]->ops != exprs[i]->ops)
4432 return false;
4433 }
4434
4435 return true;
4436 }
4437
nf_tables_newset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])4438 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4439 const struct nlattr * const nla[])
4440 {
4441 struct netlink_ext_ack *extack = info->extack;
4442 u8 genmask = nft_genmask_next(info->net);
4443 u8 family = info->nfmsg->nfgen_family;
4444 const struct nft_set_ops *ops;
4445 struct net *net = info->net;
4446 struct nft_set_desc desc;
4447 struct nft_table *table;
4448 unsigned char *udata;
4449 struct nft_set *set;
4450 struct nft_ctx ctx;
4451 size_t alloc_size;
4452 int num_exprs = 0;
4453 char *name;
4454 int err, i;
4455 u16 udlen;
4456 u32 flags;
4457 u64 size;
4458
4459 if (nla[NFTA_SET_TABLE] == NULL ||
4460 nla[NFTA_SET_NAME] == NULL ||
4461 nla[NFTA_SET_KEY_LEN] == NULL ||
4462 nla[NFTA_SET_ID] == NULL)
4463 return -EINVAL;
4464
4465 memset(&desc, 0, sizeof(desc));
4466
4467 desc.ktype = NFT_DATA_VALUE;
4468 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4469 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4470 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4471 return -EINVAL;
4472 }
4473
4474 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4475 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4476 return -EINVAL;
4477
4478 flags = 0;
4479 if (nla[NFTA_SET_FLAGS] != NULL) {
4480 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4481 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4482 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4483 NFT_SET_MAP | NFT_SET_EVAL |
4484 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4485 return -EOPNOTSUPP;
4486 /* Only one of these operations is supported */
4487 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4488 (NFT_SET_MAP | NFT_SET_OBJECT))
4489 return -EOPNOTSUPP;
4490 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4491 (NFT_SET_EVAL | NFT_SET_OBJECT))
4492 return -EOPNOTSUPP;
4493 }
4494
4495 desc.dtype = 0;
4496 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4497 if (!(flags & NFT_SET_MAP))
4498 return -EINVAL;
4499
4500 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4501 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4502 desc.dtype != NFT_DATA_VERDICT)
4503 return -EINVAL;
4504
4505 if (desc.dtype != NFT_DATA_VERDICT) {
4506 if (nla[NFTA_SET_DATA_LEN] == NULL)
4507 return -EINVAL;
4508 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4509 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4510 return -EINVAL;
4511 } else
4512 desc.dlen = sizeof(struct nft_verdict);
4513 } else if (flags & NFT_SET_MAP)
4514 return -EINVAL;
4515
4516 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4517 if (!(flags & NFT_SET_OBJECT))
4518 return -EINVAL;
4519
4520 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4521 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4522 desc.objtype > NFT_OBJECT_MAX)
4523 return -EOPNOTSUPP;
4524 } else if (flags & NFT_SET_OBJECT)
4525 return -EINVAL;
4526 else
4527 desc.objtype = NFT_OBJECT_UNSPEC;
4528
4529 desc.timeout = 0;
4530 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4531 if (!(flags & NFT_SET_TIMEOUT))
4532 return -EINVAL;
4533
4534 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4535 if (err)
4536 return err;
4537 }
4538 desc.gc_int = 0;
4539 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4540 if (!(flags & NFT_SET_TIMEOUT))
4541 return -EINVAL;
4542 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4543 }
4544
4545 desc.policy = NFT_SET_POL_PERFORMANCE;
4546 if (nla[NFTA_SET_POLICY] != NULL)
4547 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4548
4549 if (nla[NFTA_SET_DESC] != NULL) {
4550 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4551 if (err < 0)
4552 return err;
4553
4554 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4555 return -EINVAL;
4556 } else if (flags & NFT_SET_CONCAT) {
4557 return -EINVAL;
4558 }
4559
4560 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4561 desc.expr = true;
4562
4563 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4564 NETLINK_CB(skb).portid);
4565 if (IS_ERR(table)) {
4566 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4567 return PTR_ERR(table);
4568 }
4569
4570 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4571
4572 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4573 if (IS_ERR(set)) {
4574 if (PTR_ERR(set) != -ENOENT) {
4575 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4576 return PTR_ERR(set);
4577 }
4578 } else {
4579 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4580
4581 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4582 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4583 return -EEXIST;
4584 }
4585 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4586 return -EOPNOTSUPP;
4587
4588 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4589 if (err < 0)
4590 return err;
4591
4592 err = 0;
4593 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4594 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4595 err = -EEXIST;
4596 }
4597
4598 for (i = 0; i < num_exprs; i++)
4599 nft_expr_destroy(&ctx, exprs[i]);
4600
4601 if (err < 0)
4602 return err;
4603
4604 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
4605 }
4606
4607 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4608 return -ENOENT;
4609
4610 ops = nft_select_set_ops(&ctx, nla, &desc);
4611 if (IS_ERR(ops))
4612 return PTR_ERR(ops);
4613
4614 udlen = 0;
4615 if (nla[NFTA_SET_USERDATA])
4616 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4617
4618 size = 0;
4619 if (ops->privsize != NULL)
4620 size = ops->privsize(nla, &desc);
4621 alloc_size = sizeof(*set) + size + udlen;
4622 if (alloc_size < size || alloc_size > INT_MAX)
4623 return -ENOMEM;
4624 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4625 if (!set)
4626 return -ENOMEM;
4627
4628 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4629 if (!name) {
4630 err = -ENOMEM;
4631 goto err_set_name;
4632 }
4633
4634 err = nf_tables_set_alloc_name(&ctx, set, name);
4635 kfree(name);
4636 if (err < 0)
4637 goto err_set_name;
4638
4639 udata = NULL;
4640 if (udlen) {
4641 udata = set->data + size;
4642 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4643 }
4644
4645 INIT_LIST_HEAD(&set->bindings);
4646 INIT_LIST_HEAD(&set->catchall_list);
4647 set->table = table;
4648 write_pnet(&set->net, net);
4649 set->ops = ops;
4650 set->ktype = desc.ktype;
4651 set->klen = desc.klen;
4652 set->dtype = desc.dtype;
4653 set->objtype = desc.objtype;
4654 set->dlen = desc.dlen;
4655 set->flags = flags;
4656 set->size = desc.size;
4657 set->policy = desc.policy;
4658 set->udlen = udlen;
4659 set->udata = udata;
4660 set->timeout = desc.timeout;
4661 set->gc_int = desc.gc_int;
4662
4663 set->field_count = desc.field_count;
4664 for (i = 0; i < desc.field_count; i++)
4665 set->field_len[i] = desc.field_len[i];
4666
4667 err = ops->init(set, &desc, nla);
4668 if (err < 0)
4669 goto err_set_init;
4670
4671 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
4672 if (err < 0)
4673 goto err_set_destroy;
4674
4675 set->num_exprs = num_exprs;
4676 set->handle = nf_tables_alloc_handle(table);
4677
4678 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4679 if (err < 0)
4680 goto err_set_expr_alloc;
4681
4682 list_add_tail_rcu(&set->list, &table->sets);
4683 table->use++;
4684 return 0;
4685
4686 err_set_expr_alloc:
4687 for (i = 0; i < set->num_exprs; i++)
4688 nft_expr_destroy(&ctx, set->exprs[i]);
4689 err_set_destroy:
4690 ops->destroy(set);
4691 err_set_init:
4692 kfree(set->name);
4693 err_set_name:
4694 kvfree(set);
4695 return err;
4696 }
4697
4698 struct nft_set_elem_catchall {
4699 struct list_head list;
4700 struct rcu_head rcu;
4701 void *elem;
4702 };
4703
nft_set_catchall_destroy(const struct nft_ctx * ctx,struct nft_set * set)4704 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4705 struct nft_set *set)
4706 {
4707 struct nft_set_elem_catchall *next, *catchall;
4708
4709 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4710 list_del_rcu(&catchall->list);
4711 nft_set_elem_destroy(set, catchall->elem, true);
4712 kfree_rcu(catchall, rcu);
4713 }
4714 }
4715
nft_set_destroy(const struct nft_ctx * ctx,struct nft_set * set)4716 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4717 {
4718 int i;
4719
4720 if (WARN_ON(set->use > 0))
4721 return;
4722
4723 for (i = 0; i < set->num_exprs; i++)
4724 nft_expr_destroy(ctx, set->exprs[i]);
4725
4726 set->ops->destroy(set);
4727 nft_set_catchall_destroy(ctx, set);
4728 kfree(set->name);
4729 kvfree(set);
4730 }
4731
nf_tables_delset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])4732 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4733 const struct nlattr * const nla[])
4734 {
4735 struct netlink_ext_ack *extack = info->extack;
4736 u8 genmask = nft_genmask_next(info->net);
4737 u8 family = info->nfmsg->nfgen_family;
4738 struct net *net = info->net;
4739 const struct nlattr *attr;
4740 struct nft_table *table;
4741 struct nft_set *set;
4742 struct nft_ctx ctx;
4743
4744 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4745 return -EAFNOSUPPORT;
4746
4747 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4748 genmask, NETLINK_CB(skb).portid);
4749 if (IS_ERR(table)) {
4750 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4751 return PTR_ERR(table);
4752 }
4753
4754 if (nla[NFTA_SET_HANDLE]) {
4755 attr = nla[NFTA_SET_HANDLE];
4756 set = nft_set_lookup_byhandle(table, attr, genmask);
4757 } else {
4758 attr = nla[NFTA_SET_NAME];
4759 set = nft_set_lookup(table, attr, genmask);
4760 }
4761
4762 if (IS_ERR(set)) {
4763 NL_SET_BAD_ATTR(extack, attr);
4764 return PTR_ERR(set);
4765 }
4766 if (set->use ||
4767 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4768 atomic_read(&set->nelems) > 0)) {
4769 NL_SET_BAD_ATTR(extack, attr);
4770 return -EBUSY;
4771 }
4772
4773 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4774
4775 return nft_delset(&ctx, set);
4776 }
4777
4778 static int nft_validate_register_store(const struct nft_ctx *ctx,
4779 enum nft_registers reg,
4780 const struct nft_data *data,
4781 enum nft_data_types type,
4782 unsigned int len);
4783
nft_setelem_data_validate(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_elem * elem)4784 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4785 struct nft_set *set,
4786 struct nft_set_elem *elem)
4787 {
4788 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4789 enum nft_registers dreg;
4790
4791 dreg = nft_type_to_reg(set->dtype);
4792 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4793 set->dtype == NFT_DATA_VERDICT ?
4794 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4795 set->dlen);
4796 }
4797
nf_tables_bind_check_setelem(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)4798 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4799 struct nft_set *set,
4800 const struct nft_set_iter *iter,
4801 struct nft_set_elem *elem)
4802 {
4803 return nft_setelem_data_validate(ctx, set, elem);
4804 }
4805
nft_set_catchall_bind_check(const struct nft_ctx * ctx,struct nft_set * set)4806 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4807 struct nft_set *set)
4808 {
4809 u8 genmask = nft_genmask_next(ctx->net);
4810 struct nft_set_elem_catchall *catchall;
4811 struct nft_set_elem elem;
4812 struct nft_set_ext *ext;
4813 int ret = 0;
4814
4815 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4816 ext = nft_set_elem_ext(set, catchall->elem);
4817 if (!nft_set_elem_active(ext, genmask))
4818 continue;
4819
4820 elem.priv = catchall->elem;
4821 ret = nft_setelem_data_validate(ctx, set, &elem);
4822 if (ret < 0)
4823 break;
4824 }
4825
4826 return ret;
4827 }
4828
nf_tables_bind_set(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_binding * binding)4829 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4830 struct nft_set_binding *binding)
4831 {
4832 struct nft_set_binding *i;
4833 struct nft_set_iter iter;
4834
4835 if (set->use == UINT_MAX)
4836 return -EOVERFLOW;
4837
4838 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4839 return -EBUSY;
4840
4841 if (binding->flags & NFT_SET_MAP) {
4842 /* If the set is already bound to the same chain all
4843 * jumps are already validated for that chain.
4844 */
4845 list_for_each_entry(i, &set->bindings, list) {
4846 if (i->flags & NFT_SET_MAP &&
4847 i->chain == binding->chain)
4848 goto bind;
4849 }
4850
4851 iter.genmask = nft_genmask_next(ctx->net);
4852 iter.skip = 0;
4853 iter.count = 0;
4854 iter.err = 0;
4855 iter.fn = nf_tables_bind_check_setelem;
4856
4857 set->ops->walk(ctx, set, &iter);
4858 if (!iter.err)
4859 iter.err = nft_set_catchall_bind_check(ctx, set);
4860
4861 if (iter.err < 0)
4862 return iter.err;
4863 }
4864 bind:
4865 binding->chain = ctx->chain;
4866 list_add_tail_rcu(&binding->list, &set->bindings);
4867 nft_set_trans_bind(ctx, set);
4868 set->use++;
4869
4870 return 0;
4871 }
4872 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4873
nf_tables_unbind_set(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_binding * binding,bool event)4874 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4875 struct nft_set_binding *binding, bool event)
4876 {
4877 list_del_rcu(&binding->list);
4878
4879 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4880 list_del_rcu(&set->list);
4881 if (event)
4882 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4883 GFP_KERNEL);
4884 }
4885 }
4886
nf_tables_deactivate_set(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_binding * binding,enum nft_trans_phase phase)4887 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4888 struct nft_set_binding *binding,
4889 enum nft_trans_phase phase)
4890 {
4891 switch (phase) {
4892 case NFT_TRANS_PREPARE:
4893 set->use--;
4894 return;
4895 case NFT_TRANS_ABORT:
4896 case NFT_TRANS_RELEASE:
4897 set->use--;
4898 fallthrough;
4899 default:
4900 nf_tables_unbind_set(ctx, set, binding,
4901 phase == NFT_TRANS_COMMIT);
4902 }
4903 }
4904 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4905
nf_tables_destroy_set(const struct nft_ctx * ctx,struct nft_set * set)4906 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4907 {
4908 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4909 nft_set_destroy(ctx, set);
4910 }
4911 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4912
4913 const struct nft_set_ext_type nft_set_ext_types[] = {
4914 [NFT_SET_EXT_KEY] = {
4915 .align = __alignof__(u32),
4916 },
4917 [NFT_SET_EXT_DATA] = {
4918 .align = __alignof__(u32),
4919 },
4920 [NFT_SET_EXT_EXPRESSIONS] = {
4921 .align = __alignof__(struct nft_set_elem_expr),
4922 },
4923 [NFT_SET_EXT_OBJREF] = {
4924 .len = sizeof(struct nft_object *),
4925 .align = __alignof__(struct nft_object *),
4926 },
4927 [NFT_SET_EXT_FLAGS] = {
4928 .len = sizeof(u8),
4929 .align = __alignof__(u8),
4930 },
4931 [NFT_SET_EXT_TIMEOUT] = {
4932 .len = sizeof(u64),
4933 .align = __alignof__(u64),
4934 },
4935 [NFT_SET_EXT_EXPIRATION] = {
4936 .len = sizeof(u64),
4937 .align = __alignof__(u64),
4938 },
4939 [NFT_SET_EXT_USERDATA] = {
4940 .len = sizeof(struct nft_userdata),
4941 .align = __alignof__(struct nft_userdata),
4942 },
4943 [NFT_SET_EXT_KEY_END] = {
4944 .align = __alignof__(u32),
4945 },
4946 };
4947
4948 /*
4949 * Set elements
4950 */
4951
4952 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4953 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4954 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4955 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
4956 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
4957 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
4958 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4959 .len = NFT_USERDATA_MAXLEN },
4960 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
4961 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4962 .len = NFT_OBJ_MAXNAMELEN - 1 },
4963 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
4964 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
4965 };
4966
4967 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4968 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4969 .len = NFT_TABLE_MAXNAMELEN - 1 },
4970 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4971 .len = NFT_SET_MAXNAMELEN - 1 },
4972 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
4973 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
4974 };
4975
nft_set_elem_expr_dump(struct sk_buff * skb,const struct nft_set * set,const struct nft_set_ext * ext)4976 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4977 const struct nft_set *set,
4978 const struct nft_set_ext *ext)
4979 {
4980 struct nft_set_elem_expr *elem_expr;
4981 u32 size, num_exprs = 0;
4982 struct nft_expr *expr;
4983 struct nlattr *nest;
4984
4985 elem_expr = nft_set_ext_expr(ext);
4986 nft_setelem_expr_foreach(expr, elem_expr, size)
4987 num_exprs++;
4988
4989 if (num_exprs == 1) {
4990 expr = nft_setelem_expr_at(elem_expr, 0);
4991 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4992 return -1;
4993
4994 return 0;
4995 } else if (num_exprs > 1) {
4996 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4997 if (nest == NULL)
4998 goto nla_put_failure;
4999
5000 nft_setelem_expr_foreach(expr, elem_expr, size) {
5001 expr = nft_setelem_expr_at(elem_expr, size);
5002 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
5003 goto nla_put_failure;
5004 }
5005 nla_nest_end(skb, nest);
5006 }
5007 return 0;
5008
5009 nla_put_failure:
5010 return -1;
5011 }
5012
nf_tables_fill_setelem(struct sk_buff * skb,const struct nft_set * set,const struct nft_set_elem * elem)5013 static int nf_tables_fill_setelem(struct sk_buff *skb,
5014 const struct nft_set *set,
5015 const struct nft_set_elem *elem)
5016 {
5017 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5018 unsigned char *b = skb_tail_pointer(skb);
5019 struct nlattr *nest;
5020
5021 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5022 if (nest == NULL)
5023 goto nla_put_failure;
5024
5025 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5026 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5027 NFT_DATA_VALUE, set->klen) < 0)
5028 goto nla_put_failure;
5029
5030 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5031 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5032 NFT_DATA_VALUE, set->klen) < 0)
5033 goto nla_put_failure;
5034
5035 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5036 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5037 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5038 set->dlen) < 0)
5039 goto nla_put_failure;
5040
5041 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5042 nft_set_elem_expr_dump(skb, set, ext))
5043 goto nla_put_failure;
5044
5045 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5046 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5047 (*nft_set_ext_obj(ext))->key.name) < 0)
5048 goto nla_put_failure;
5049
5050 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5051 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5052 htonl(*nft_set_ext_flags(ext))))
5053 goto nla_put_failure;
5054
5055 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5056 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5057 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5058 NFTA_SET_ELEM_PAD))
5059 goto nla_put_failure;
5060
5061 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5062 u64 expires, now = get_jiffies_64();
5063
5064 expires = *nft_set_ext_expiration(ext);
5065 if (time_before64(now, expires))
5066 expires -= now;
5067 else
5068 expires = 0;
5069
5070 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5071 nf_jiffies64_to_msecs(expires),
5072 NFTA_SET_ELEM_PAD))
5073 goto nla_put_failure;
5074 }
5075
5076 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5077 struct nft_userdata *udata;
5078
5079 udata = nft_set_ext_userdata(ext);
5080 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5081 udata->len + 1, udata->data))
5082 goto nla_put_failure;
5083 }
5084
5085 nla_nest_end(skb, nest);
5086 return 0;
5087
5088 nla_put_failure:
5089 nlmsg_trim(skb, b);
5090 return -EMSGSIZE;
5091 }
5092
5093 struct nft_set_dump_args {
5094 const struct netlink_callback *cb;
5095 struct nft_set_iter iter;
5096 struct sk_buff *skb;
5097 };
5098
nf_tables_dump_setelem(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)5099 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5100 struct nft_set *set,
5101 const struct nft_set_iter *iter,
5102 struct nft_set_elem *elem)
5103 {
5104 struct nft_set_dump_args *args;
5105
5106 args = container_of(iter, struct nft_set_dump_args, iter);
5107 return nf_tables_fill_setelem(args->skb, set, elem);
5108 }
5109
5110 struct nft_set_dump_ctx {
5111 const struct nft_set *set;
5112 struct nft_ctx ctx;
5113 };
5114
nft_set_catchall_dump(struct net * net,struct sk_buff * skb,const struct nft_set * set)5115 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5116 const struct nft_set *set)
5117 {
5118 struct nft_set_elem_catchall *catchall;
5119 u8 genmask = nft_genmask_cur(net);
5120 struct nft_set_elem elem;
5121 struct nft_set_ext *ext;
5122 int ret = 0;
5123
5124 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5125 ext = nft_set_elem_ext(set, catchall->elem);
5126 if (!nft_set_elem_active(ext, genmask) ||
5127 nft_set_elem_expired(ext))
5128 continue;
5129
5130 elem.priv = catchall->elem;
5131 ret = nf_tables_fill_setelem(skb, set, &elem);
5132 break;
5133 }
5134
5135 return ret;
5136 }
5137
nf_tables_dump_set(struct sk_buff * skb,struct netlink_callback * cb)5138 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5139 {
5140 struct nft_set_dump_ctx *dump_ctx = cb->data;
5141 struct net *net = sock_net(skb->sk);
5142 struct nftables_pernet *nft_net;
5143 struct nft_table *table;
5144 struct nft_set *set;
5145 struct nft_set_dump_args args;
5146 bool set_found = false;
5147 struct nlmsghdr *nlh;
5148 struct nlattr *nest;
5149 u32 portid, seq;
5150 int event;
5151
5152 rcu_read_lock();
5153 nft_net = nft_pernet(net);
5154 cb->seq = READ_ONCE(nft_net->base_seq);
5155
5156 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5157 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5158 dump_ctx->ctx.family != table->family)
5159 continue;
5160
5161 if (table != dump_ctx->ctx.table)
5162 continue;
5163
5164 list_for_each_entry_rcu(set, &table->sets, list) {
5165 if (set == dump_ctx->set) {
5166 set_found = true;
5167 break;
5168 }
5169 }
5170 break;
5171 }
5172
5173 if (!set_found) {
5174 rcu_read_unlock();
5175 return -ENOENT;
5176 }
5177
5178 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5179 portid = NETLINK_CB(cb->skb).portid;
5180 seq = cb->nlh->nlmsg_seq;
5181
5182 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5183 table->family, NFNETLINK_V0, nft_base_seq(net));
5184 if (!nlh)
5185 goto nla_put_failure;
5186
5187 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5188 goto nla_put_failure;
5189 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5190 goto nla_put_failure;
5191
5192 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5193 if (nest == NULL)
5194 goto nla_put_failure;
5195
5196 args.cb = cb;
5197 args.skb = skb;
5198 args.iter.genmask = nft_genmask_cur(net);
5199 args.iter.skip = cb->args[0];
5200 args.iter.count = 0;
5201 args.iter.err = 0;
5202 args.iter.fn = nf_tables_dump_setelem;
5203 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5204
5205 if (!args.iter.err && args.iter.count == cb->args[0])
5206 args.iter.err = nft_set_catchall_dump(net, skb, set);
5207 rcu_read_unlock();
5208
5209 nla_nest_end(skb, nest);
5210 nlmsg_end(skb, nlh);
5211
5212 if (args.iter.err && args.iter.err != -EMSGSIZE)
5213 return args.iter.err;
5214 if (args.iter.count == cb->args[0])
5215 return 0;
5216
5217 cb->args[0] = args.iter.count;
5218 return skb->len;
5219
5220 nla_put_failure:
5221 rcu_read_unlock();
5222 return -ENOSPC;
5223 }
5224
nf_tables_dump_set_start(struct netlink_callback * cb)5225 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5226 {
5227 struct nft_set_dump_ctx *dump_ctx = cb->data;
5228
5229 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5230
5231 return cb->data ? 0 : -ENOMEM;
5232 }
5233
nf_tables_dump_set_done(struct netlink_callback * cb)5234 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5235 {
5236 kfree(cb->data);
5237 return 0;
5238 }
5239
nf_tables_fill_setelem_info(struct sk_buff * skb,const struct nft_ctx * ctx,u32 seq,u32 portid,int event,u16 flags,const struct nft_set * set,const struct nft_set_elem * elem)5240 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5241 const struct nft_ctx *ctx, u32 seq,
5242 u32 portid, int event, u16 flags,
5243 const struct nft_set *set,
5244 const struct nft_set_elem *elem)
5245 {
5246 struct nlmsghdr *nlh;
5247 struct nlattr *nest;
5248 int err;
5249
5250 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5251 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5252 NFNETLINK_V0, nft_base_seq(ctx->net));
5253 if (!nlh)
5254 goto nla_put_failure;
5255
5256 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5257 goto nla_put_failure;
5258 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5259 goto nla_put_failure;
5260
5261 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5262 if (nest == NULL)
5263 goto nla_put_failure;
5264
5265 err = nf_tables_fill_setelem(skb, set, elem);
5266 if (err < 0)
5267 goto nla_put_failure;
5268
5269 nla_nest_end(skb, nest);
5270
5271 nlmsg_end(skb, nlh);
5272 return 0;
5273
5274 nla_put_failure:
5275 nlmsg_trim(skb, nlh);
5276 return -1;
5277 }
5278
nft_setelem_parse_flags(const struct nft_set * set,const struct nlattr * attr,u32 * flags)5279 static int nft_setelem_parse_flags(const struct nft_set *set,
5280 const struct nlattr *attr, u32 *flags)
5281 {
5282 if (attr == NULL)
5283 return 0;
5284
5285 *flags = ntohl(nla_get_be32(attr));
5286 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5287 return -EOPNOTSUPP;
5288 if (!(set->flags & NFT_SET_INTERVAL) &&
5289 *flags & NFT_SET_ELEM_INTERVAL_END)
5290 return -EINVAL;
5291 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5292 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5293 return -EINVAL;
5294
5295 return 0;
5296 }
5297
nft_setelem_parse_key(struct nft_ctx * ctx,struct nft_set * set,struct nft_data * key,struct nlattr * attr)5298 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5299 struct nft_data *key, struct nlattr *attr)
5300 {
5301 struct nft_data_desc desc = {
5302 .type = NFT_DATA_VALUE,
5303 .size = NFT_DATA_VALUE_MAXLEN,
5304 .len = set->klen,
5305 };
5306
5307 return nft_data_init(ctx, key, &desc, attr);
5308 }
5309
nft_setelem_parse_data(struct nft_ctx * ctx,struct nft_set * set,struct nft_data_desc * desc,struct nft_data * data,struct nlattr * attr)5310 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5311 struct nft_data_desc *desc,
5312 struct nft_data *data,
5313 struct nlattr *attr)
5314 {
5315 u32 dtype;
5316
5317 if (set->dtype == NFT_DATA_VERDICT)
5318 dtype = NFT_DATA_VERDICT;
5319 else
5320 dtype = NFT_DATA_VALUE;
5321
5322 desc->type = dtype;
5323 desc->size = NFT_DATA_VALUE_MAXLEN;
5324 desc->len = set->dlen;
5325 desc->flags = NFT_DATA_DESC_SETELEM;
5326
5327 return nft_data_init(ctx, data, desc, attr);
5328 }
5329
nft_setelem_catchall_get(const struct net * net,const struct nft_set * set)5330 static void *nft_setelem_catchall_get(const struct net *net,
5331 const struct nft_set *set)
5332 {
5333 struct nft_set_elem_catchall *catchall;
5334 u8 genmask = nft_genmask_cur(net);
5335 struct nft_set_ext *ext;
5336 void *priv = NULL;
5337
5338 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5339 ext = nft_set_elem_ext(set, catchall->elem);
5340 if (!nft_set_elem_active(ext, genmask) ||
5341 nft_set_elem_expired(ext))
5342 continue;
5343
5344 priv = catchall->elem;
5345 break;
5346 }
5347
5348 return priv;
5349 }
5350
nft_setelem_get(struct nft_ctx * ctx,struct nft_set * set,struct nft_set_elem * elem,u32 flags)5351 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5352 struct nft_set_elem *elem, u32 flags)
5353 {
5354 void *priv;
5355
5356 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5357 priv = set->ops->get(ctx->net, set, elem, flags);
5358 if (IS_ERR(priv))
5359 return PTR_ERR(priv);
5360 } else {
5361 priv = nft_setelem_catchall_get(ctx->net, set);
5362 if (!priv)
5363 return -ENOENT;
5364 }
5365 elem->priv = priv;
5366
5367 return 0;
5368 }
5369
nft_get_set_elem(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * attr)5370 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5371 const struct nlattr *attr)
5372 {
5373 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5374 struct nft_set_elem elem;
5375 struct sk_buff *skb;
5376 uint32_t flags = 0;
5377 int err;
5378
5379 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5380 nft_set_elem_policy, NULL);
5381 if (err < 0)
5382 return err;
5383
5384 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5385 if (err < 0)
5386 return err;
5387
5388 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5389 return -EINVAL;
5390
5391 if (nla[NFTA_SET_ELEM_KEY]) {
5392 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5393 nla[NFTA_SET_ELEM_KEY]);
5394 if (err < 0)
5395 return err;
5396 }
5397
5398 if (nla[NFTA_SET_ELEM_KEY_END]) {
5399 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5400 nla[NFTA_SET_ELEM_KEY_END]);
5401 if (err < 0)
5402 return err;
5403 }
5404
5405 err = nft_setelem_get(ctx, set, &elem, flags);
5406 if (err < 0)
5407 return err;
5408
5409 err = -ENOMEM;
5410 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5411 if (skb == NULL)
5412 return err;
5413
5414 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5415 NFT_MSG_NEWSETELEM, 0, set, &elem);
5416 if (err < 0)
5417 goto err_fill_setelem;
5418
5419 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5420
5421 err_fill_setelem:
5422 kfree_skb(skb);
5423 return err;
5424 }
5425
5426 /* called with rcu_read_lock held */
nf_tables_getsetelem(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])5427 static int nf_tables_getsetelem(struct sk_buff *skb,
5428 const struct nfnl_info *info,
5429 const struct nlattr * const nla[])
5430 {
5431 struct netlink_ext_ack *extack = info->extack;
5432 u8 genmask = nft_genmask_cur(info->net);
5433 u8 family = info->nfmsg->nfgen_family;
5434 struct net *net = info->net;
5435 struct nft_table *table;
5436 struct nft_set *set;
5437 struct nlattr *attr;
5438 struct nft_ctx ctx;
5439 int rem, err = 0;
5440
5441 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5442 genmask, NETLINK_CB(skb).portid);
5443 if (IS_ERR(table)) {
5444 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5445 return PTR_ERR(table);
5446 }
5447
5448 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5449 if (IS_ERR(set))
5450 return PTR_ERR(set);
5451
5452 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5453
5454 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5455 struct netlink_dump_control c = {
5456 .start = nf_tables_dump_set_start,
5457 .dump = nf_tables_dump_set,
5458 .done = nf_tables_dump_set_done,
5459 .module = THIS_MODULE,
5460 };
5461 struct nft_set_dump_ctx dump_ctx = {
5462 .set = set,
5463 .ctx = ctx,
5464 };
5465
5466 c.data = &dump_ctx;
5467 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5468 }
5469
5470 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5471 return -EINVAL;
5472
5473 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5474 err = nft_get_set_elem(&ctx, set, attr);
5475 if (err < 0) {
5476 NL_SET_BAD_ATTR(extack, attr);
5477 break;
5478 }
5479 }
5480
5481 return err;
5482 }
5483
nf_tables_setelem_notify(const struct nft_ctx * ctx,const struct nft_set * set,const struct nft_set_elem * elem,int event)5484 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5485 const struct nft_set *set,
5486 const struct nft_set_elem *elem,
5487 int event)
5488 {
5489 struct nftables_pernet *nft_net;
5490 struct net *net = ctx->net;
5491 u32 portid = ctx->portid;
5492 struct sk_buff *skb;
5493 u16 flags = 0;
5494 int err;
5495
5496 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5497 return;
5498
5499 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5500 if (skb == NULL)
5501 goto err;
5502
5503 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5504 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5505
5506 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5507 set, elem);
5508 if (err < 0) {
5509 kfree_skb(skb);
5510 goto err;
5511 }
5512
5513 nft_net = nft_pernet(net);
5514 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5515 return;
5516 err:
5517 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5518 }
5519
nft_trans_elem_alloc(struct nft_ctx * ctx,int msg_type,struct nft_set * set)5520 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5521 int msg_type,
5522 struct nft_set *set)
5523 {
5524 struct nft_trans *trans;
5525
5526 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5527 if (trans == NULL)
5528 return NULL;
5529
5530 nft_trans_elem_set(trans) = set;
5531 return trans;
5532 }
5533
nft_set_elem_expr_alloc(const struct nft_ctx * ctx,const struct nft_set * set,const struct nlattr * attr)5534 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5535 const struct nft_set *set,
5536 const struct nlattr *attr)
5537 {
5538 struct nft_expr *expr;
5539 int err;
5540
5541 expr = nft_expr_init(ctx, attr);
5542 if (IS_ERR(expr))
5543 return expr;
5544
5545 err = -EOPNOTSUPP;
5546 if (expr->ops->type->flags & NFT_EXPR_GC) {
5547 if (set->flags & NFT_SET_TIMEOUT)
5548 goto err_set_elem_expr;
5549 if (!set->ops->gc_init)
5550 goto err_set_elem_expr;
5551 set->ops->gc_init(set);
5552 }
5553
5554 return expr;
5555
5556 err_set_elem_expr:
5557 nft_expr_destroy(ctx, expr);
5558 return ERR_PTR(err);
5559 }
5560
nft_set_ext_check(const struct nft_set_ext_tmpl * tmpl,u8 id,u32 len)5561 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5562 {
5563 len += nft_set_ext_types[id].len;
5564 if (len > tmpl->ext_len[id] ||
5565 len > U8_MAX)
5566 return -1;
5567
5568 return 0;
5569 }
5570
nft_set_ext_memcpy(const struct nft_set_ext_tmpl * tmpl,u8 id,void * to,const void * from,u32 len)5571 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5572 void *to, const void *from, u32 len)
5573 {
5574 if (nft_set_ext_check(tmpl, id, len) < 0)
5575 return -1;
5576
5577 memcpy(to, from, len);
5578
5579 return 0;
5580 }
5581
nft_set_elem_init(const struct nft_set * set,const struct nft_set_ext_tmpl * tmpl,const u32 * key,const u32 * key_end,const u32 * data,u64 timeout,u64 expiration,gfp_t gfp)5582 void *nft_set_elem_init(const struct nft_set *set,
5583 const struct nft_set_ext_tmpl *tmpl,
5584 const u32 *key, const u32 *key_end,
5585 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5586 {
5587 struct nft_set_ext *ext;
5588 void *elem;
5589
5590 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5591 if (elem == NULL)
5592 return ERR_PTR(-ENOMEM);
5593
5594 ext = nft_set_elem_ext(set, elem);
5595 nft_set_ext_init(ext, tmpl);
5596
5597 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5598 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5599 nft_set_ext_key(ext), key, set->klen) < 0)
5600 goto err_ext_check;
5601
5602 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5603 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5604 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5605 goto err_ext_check;
5606
5607 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5608 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5609 nft_set_ext_data(ext), data, set->dlen) < 0)
5610 goto err_ext_check;
5611
5612 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5613 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5614 if (expiration == 0)
5615 *nft_set_ext_expiration(ext) += timeout;
5616 }
5617 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5618 *nft_set_ext_timeout(ext) = timeout;
5619
5620 return elem;
5621
5622 err_ext_check:
5623 kfree(elem);
5624
5625 return ERR_PTR(-EINVAL);
5626 }
5627
__nft_set_elem_expr_destroy(const struct nft_ctx * ctx,struct nft_expr * expr)5628 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5629 struct nft_expr *expr)
5630 {
5631 if (expr->ops->destroy_clone) {
5632 expr->ops->destroy_clone(ctx, expr);
5633 module_put(expr->ops->type->owner);
5634 } else {
5635 nf_tables_expr_destroy(ctx, expr);
5636 }
5637 }
5638
nft_set_elem_expr_destroy(const struct nft_ctx * ctx,struct nft_set_elem_expr * elem_expr)5639 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5640 struct nft_set_elem_expr *elem_expr)
5641 {
5642 struct nft_expr *expr;
5643 u32 size;
5644
5645 nft_setelem_expr_foreach(expr, elem_expr, size)
5646 __nft_set_elem_expr_destroy(ctx, expr);
5647 }
5648
nft_set_elem_destroy(const struct nft_set * set,void * elem,bool destroy_expr)5649 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5650 bool destroy_expr)
5651 {
5652 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5653 struct nft_ctx ctx = {
5654 .net = read_pnet(&set->net),
5655 .family = set->table->family,
5656 };
5657
5658 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5659 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5660 nft_data_release(nft_set_ext_data(ext), set->dtype);
5661 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5662 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5663
5664 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5665 (*nft_set_ext_obj(ext))->use--;
5666 kfree(elem);
5667 }
5668 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5669
5670 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5671 * with the refcounting from the preparation phase.
5672 */
nf_tables_set_elem_destroy(const struct nft_ctx * ctx,const struct nft_set * set,void * elem)5673 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5674 const struct nft_set *set, void *elem)
5675 {
5676 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5677
5678 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5679 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5680
5681 kfree(elem);
5682 }
5683
nft_set_elem_expr_clone(const struct nft_ctx * ctx,struct nft_set * set,struct nft_expr * expr_array[])5684 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5685 struct nft_expr *expr_array[])
5686 {
5687 struct nft_expr *expr;
5688 int err, i, k;
5689
5690 for (i = 0; i < set->num_exprs; i++) {
5691 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5692 if (!expr)
5693 goto err_expr;
5694
5695 err = nft_expr_clone(expr, set->exprs[i]);
5696 if (err < 0) {
5697 kfree(expr);
5698 goto err_expr;
5699 }
5700 expr_array[i] = expr;
5701 }
5702
5703 return 0;
5704
5705 err_expr:
5706 for (k = i - 1; k >= 0; k--)
5707 nft_expr_destroy(ctx, expr_array[k]);
5708
5709 return -ENOMEM;
5710 }
5711
nft_set_elem_expr_setup(struct nft_ctx * ctx,const struct nft_set_ext_tmpl * tmpl,const struct nft_set_ext * ext,struct nft_expr * expr_array[],u32 num_exprs)5712 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5713 const struct nft_set_ext_tmpl *tmpl,
5714 const struct nft_set_ext *ext,
5715 struct nft_expr *expr_array[],
5716 u32 num_exprs)
5717 {
5718 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5719 u32 len = sizeof(struct nft_set_elem_expr);
5720 struct nft_expr *expr;
5721 int i, err;
5722
5723 if (num_exprs == 0)
5724 return 0;
5725
5726 for (i = 0; i < num_exprs; i++)
5727 len += expr_array[i]->ops->size;
5728
5729 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5730 return -EINVAL;
5731
5732 for (i = 0; i < num_exprs; i++) {
5733 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5734 err = nft_expr_clone(expr, expr_array[i]);
5735 if (err < 0)
5736 goto err_elem_expr_setup;
5737
5738 elem_expr->size += expr_array[i]->ops->size;
5739 nft_expr_destroy(ctx, expr_array[i]);
5740 expr_array[i] = NULL;
5741 }
5742
5743 return 0;
5744
5745 err_elem_expr_setup:
5746 for (; i < num_exprs; i++) {
5747 nft_expr_destroy(ctx, expr_array[i]);
5748 expr_array[i] = NULL;
5749 }
5750
5751 return -ENOMEM;
5752 }
5753
nft_set_catchall_lookup(const struct net * net,const struct nft_set * set)5754 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5755 const struct nft_set *set)
5756 {
5757 struct nft_set_elem_catchall *catchall;
5758 u8 genmask = nft_genmask_cur(net);
5759 struct nft_set_ext *ext;
5760
5761 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5762 ext = nft_set_elem_ext(set, catchall->elem);
5763 if (nft_set_elem_active(ext, genmask) &&
5764 !nft_set_elem_expired(ext))
5765 return ext;
5766 }
5767
5768 return NULL;
5769 }
5770 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5771
nft_set_catchall_gc(const struct nft_set * set)5772 void *nft_set_catchall_gc(const struct nft_set *set)
5773 {
5774 struct nft_set_elem_catchall *catchall, *next;
5775 struct nft_set_ext *ext;
5776 void *elem = NULL;
5777
5778 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5779 ext = nft_set_elem_ext(set, catchall->elem);
5780
5781 if (!nft_set_elem_expired(ext) ||
5782 nft_set_elem_mark_busy(ext))
5783 continue;
5784
5785 elem = catchall->elem;
5786 list_del_rcu(&catchall->list);
5787 kfree_rcu(catchall, rcu);
5788 break;
5789 }
5790
5791 return elem;
5792 }
5793 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5794
nft_setelem_catchall_insert(const struct net * net,struct nft_set * set,const struct nft_set_elem * elem,struct nft_set_ext ** pext)5795 static int nft_setelem_catchall_insert(const struct net *net,
5796 struct nft_set *set,
5797 const struct nft_set_elem *elem,
5798 struct nft_set_ext **pext)
5799 {
5800 struct nft_set_elem_catchall *catchall;
5801 u8 genmask = nft_genmask_next(net);
5802 struct nft_set_ext *ext;
5803
5804 list_for_each_entry(catchall, &set->catchall_list, list) {
5805 ext = nft_set_elem_ext(set, catchall->elem);
5806 if (nft_set_elem_active(ext, genmask)) {
5807 *pext = ext;
5808 return -EEXIST;
5809 }
5810 }
5811
5812 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5813 if (!catchall)
5814 return -ENOMEM;
5815
5816 catchall->elem = elem->priv;
5817 list_add_tail_rcu(&catchall->list, &set->catchall_list);
5818
5819 return 0;
5820 }
5821
nft_setelem_insert(const struct net * net,struct nft_set * set,const struct nft_set_elem * elem,struct nft_set_ext ** ext,unsigned int flags)5822 static int nft_setelem_insert(const struct net *net,
5823 struct nft_set *set,
5824 const struct nft_set_elem *elem,
5825 struct nft_set_ext **ext, unsigned int flags)
5826 {
5827 int ret;
5828
5829 if (flags & NFT_SET_ELEM_CATCHALL)
5830 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5831 else
5832 ret = set->ops->insert(net, set, elem, ext);
5833
5834 return ret;
5835 }
5836
nft_setelem_is_catchall(const struct nft_set * set,const struct nft_set_elem * elem)5837 static bool nft_setelem_is_catchall(const struct nft_set *set,
5838 const struct nft_set_elem *elem)
5839 {
5840 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5841
5842 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5843 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5844 return true;
5845
5846 return false;
5847 }
5848
nft_setelem_activate(struct net * net,struct nft_set * set,struct nft_set_elem * elem)5849 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5850 struct nft_set_elem *elem)
5851 {
5852 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5853
5854 if (nft_setelem_is_catchall(set, elem)) {
5855 nft_set_elem_change_active(net, set, ext);
5856 nft_set_elem_clear_busy(ext);
5857 } else {
5858 set->ops->activate(net, set, elem);
5859 }
5860 }
5861
nft_setelem_catchall_deactivate(const struct net * net,struct nft_set * set,struct nft_set_elem * elem)5862 static int nft_setelem_catchall_deactivate(const struct net *net,
5863 struct nft_set *set,
5864 struct nft_set_elem *elem)
5865 {
5866 struct nft_set_elem_catchall *catchall;
5867 struct nft_set_ext *ext;
5868
5869 list_for_each_entry(catchall, &set->catchall_list, list) {
5870 ext = nft_set_elem_ext(set, catchall->elem);
5871 if (!nft_is_active(net, ext) ||
5872 nft_set_elem_mark_busy(ext))
5873 continue;
5874
5875 kfree(elem->priv);
5876 elem->priv = catchall->elem;
5877 nft_set_elem_change_active(net, set, ext);
5878 return 0;
5879 }
5880
5881 return -ENOENT;
5882 }
5883
__nft_setelem_deactivate(const struct net * net,struct nft_set * set,struct nft_set_elem * elem)5884 static int __nft_setelem_deactivate(const struct net *net,
5885 struct nft_set *set,
5886 struct nft_set_elem *elem)
5887 {
5888 void *priv;
5889
5890 priv = set->ops->deactivate(net, set, elem);
5891 if (!priv)
5892 return -ENOENT;
5893
5894 kfree(elem->priv);
5895 elem->priv = priv;
5896 set->ndeact++;
5897
5898 return 0;
5899 }
5900
nft_setelem_deactivate(const struct net * net,struct nft_set * set,struct nft_set_elem * elem,u32 flags)5901 static int nft_setelem_deactivate(const struct net *net,
5902 struct nft_set *set,
5903 struct nft_set_elem *elem, u32 flags)
5904 {
5905 int ret;
5906
5907 if (flags & NFT_SET_ELEM_CATCHALL)
5908 ret = nft_setelem_catchall_deactivate(net, set, elem);
5909 else
5910 ret = __nft_setelem_deactivate(net, set, elem);
5911
5912 return ret;
5913 }
5914
nft_setelem_catchall_remove(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)5915 static void nft_setelem_catchall_remove(const struct net *net,
5916 const struct nft_set *set,
5917 const struct nft_set_elem *elem)
5918 {
5919 struct nft_set_elem_catchall *catchall, *next;
5920
5921 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5922 if (catchall->elem == elem->priv) {
5923 list_del_rcu(&catchall->list);
5924 kfree_rcu(catchall, rcu);
5925 break;
5926 }
5927 }
5928 }
5929
nft_setelem_remove(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)5930 static void nft_setelem_remove(const struct net *net,
5931 const struct nft_set *set,
5932 const struct nft_set_elem *elem)
5933 {
5934 if (nft_setelem_is_catchall(set, elem))
5935 nft_setelem_catchall_remove(net, set, elem);
5936 else
5937 set->ops->remove(net, set, elem);
5938 }
5939
nft_setelem_valid_key_end(const struct nft_set * set,struct nlattr ** nla,u32 flags)5940 static bool nft_setelem_valid_key_end(const struct nft_set *set,
5941 struct nlattr **nla, u32 flags)
5942 {
5943 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
5944 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
5945 if (flags & NFT_SET_ELEM_INTERVAL_END)
5946 return false;
5947
5948 if (nla[NFTA_SET_ELEM_KEY_END] &&
5949 flags & NFT_SET_ELEM_CATCHALL)
5950 return false;
5951 } else {
5952 if (nla[NFTA_SET_ELEM_KEY_END])
5953 return false;
5954 }
5955
5956 return true;
5957 }
5958
nft_add_set_elem(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * attr,u32 nlmsg_flags)5959 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5960 const struct nlattr *attr, u32 nlmsg_flags)
5961 {
5962 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5963 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5964 u8 genmask = nft_genmask_next(ctx->net);
5965 u32 flags = 0, size = 0, num_exprs = 0;
5966 struct nft_set_ext_tmpl tmpl;
5967 struct nft_set_ext *ext, *ext2;
5968 struct nft_set_elem elem;
5969 struct nft_set_binding *binding;
5970 struct nft_object *obj = NULL;
5971 struct nft_userdata *udata;
5972 struct nft_data_desc desc;
5973 enum nft_registers dreg;
5974 struct nft_trans *trans;
5975 u64 timeout;
5976 u64 expiration;
5977 int err, i;
5978 u8 ulen;
5979
5980 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5981 nft_set_elem_policy, NULL);
5982 if (err < 0)
5983 return err;
5984
5985 nft_set_ext_prepare(&tmpl);
5986
5987 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5988 if (err < 0)
5989 return err;
5990
5991 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5992 return -EINVAL;
5993
5994 if (flags != 0) {
5995 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5996 if (err < 0)
5997 return err;
5998 }
5999
6000 if (set->flags & NFT_SET_MAP) {
6001 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6002 !(flags & NFT_SET_ELEM_INTERVAL_END))
6003 return -EINVAL;
6004 } else {
6005 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6006 return -EINVAL;
6007 }
6008
6009 if (set->flags & NFT_SET_OBJECT) {
6010 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6011 !(flags & NFT_SET_ELEM_INTERVAL_END))
6012 return -EINVAL;
6013 } else {
6014 if (nla[NFTA_SET_ELEM_OBJREF])
6015 return -EINVAL;
6016 }
6017
6018 if (!nft_setelem_valid_key_end(set, nla, flags))
6019 return -EINVAL;
6020
6021 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6022 (nla[NFTA_SET_ELEM_DATA] ||
6023 nla[NFTA_SET_ELEM_OBJREF] ||
6024 nla[NFTA_SET_ELEM_TIMEOUT] ||
6025 nla[NFTA_SET_ELEM_EXPIRATION] ||
6026 nla[NFTA_SET_ELEM_USERDATA] ||
6027 nla[NFTA_SET_ELEM_EXPR] ||
6028 nla[NFTA_SET_ELEM_KEY_END] ||
6029 nla[NFTA_SET_ELEM_EXPRESSIONS]))
6030 return -EINVAL;
6031
6032 timeout = 0;
6033 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6034 if (!(set->flags & NFT_SET_TIMEOUT))
6035 return -EINVAL;
6036 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6037 &timeout);
6038 if (err)
6039 return err;
6040 } else if (set->flags & NFT_SET_TIMEOUT &&
6041 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6042 timeout = READ_ONCE(set->timeout);
6043 }
6044
6045 expiration = 0;
6046 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6047 if (!(set->flags & NFT_SET_TIMEOUT))
6048 return -EINVAL;
6049 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6050 &expiration);
6051 if (err)
6052 return err;
6053 }
6054
6055 if (nla[NFTA_SET_ELEM_EXPR]) {
6056 struct nft_expr *expr;
6057
6058 if (set->num_exprs && set->num_exprs != 1)
6059 return -EOPNOTSUPP;
6060
6061 expr = nft_set_elem_expr_alloc(ctx, set,
6062 nla[NFTA_SET_ELEM_EXPR]);
6063 if (IS_ERR(expr))
6064 return PTR_ERR(expr);
6065
6066 expr_array[0] = expr;
6067 num_exprs = 1;
6068
6069 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6070 err = -EOPNOTSUPP;
6071 goto err_set_elem_expr;
6072 }
6073 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6074 struct nft_expr *expr;
6075 struct nlattr *tmp;
6076 int left;
6077
6078 i = 0;
6079 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6080 if (i == NFT_SET_EXPR_MAX ||
6081 (set->num_exprs && set->num_exprs == i)) {
6082 err = -E2BIG;
6083 goto err_set_elem_expr;
6084 }
6085 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6086 err = -EINVAL;
6087 goto err_set_elem_expr;
6088 }
6089 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6090 if (IS_ERR(expr)) {
6091 err = PTR_ERR(expr);
6092 goto err_set_elem_expr;
6093 }
6094 expr_array[i] = expr;
6095 num_exprs++;
6096
6097 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6098 err = -EOPNOTSUPP;
6099 goto err_set_elem_expr;
6100 }
6101 i++;
6102 }
6103 if (set->num_exprs && set->num_exprs != i) {
6104 err = -EOPNOTSUPP;
6105 goto err_set_elem_expr;
6106 }
6107 } else if (set->num_exprs > 0 &&
6108 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6109 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6110 if (err < 0)
6111 goto err_set_elem_expr_clone;
6112
6113 num_exprs = set->num_exprs;
6114 }
6115
6116 if (nla[NFTA_SET_ELEM_KEY]) {
6117 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6118 nla[NFTA_SET_ELEM_KEY]);
6119 if (err < 0)
6120 goto err_set_elem_expr;
6121
6122 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6123 if (err < 0)
6124 goto err_parse_key;
6125 }
6126
6127 if (nla[NFTA_SET_ELEM_KEY_END]) {
6128 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6129 nla[NFTA_SET_ELEM_KEY_END]);
6130 if (err < 0)
6131 goto err_parse_key;
6132
6133 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6134 if (err < 0)
6135 goto err_parse_key_end;
6136 }
6137
6138 if (timeout > 0) {
6139 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6140 if (err < 0)
6141 goto err_parse_key_end;
6142
6143 if (timeout != READ_ONCE(set->timeout)) {
6144 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6145 if (err < 0)
6146 goto err_parse_key_end;
6147 }
6148 }
6149
6150 if (num_exprs) {
6151 for (i = 0; i < num_exprs; i++)
6152 size += expr_array[i]->ops->size;
6153
6154 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6155 sizeof(struct nft_set_elem_expr) + size);
6156 if (err < 0)
6157 goto err_parse_key_end;
6158 }
6159
6160 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6161 obj = nft_obj_lookup(ctx->net, ctx->table,
6162 nla[NFTA_SET_ELEM_OBJREF],
6163 set->objtype, genmask);
6164 if (IS_ERR(obj)) {
6165 err = PTR_ERR(obj);
6166 goto err_parse_key_end;
6167 }
6168 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6169 if (err < 0)
6170 goto err_parse_key_end;
6171 }
6172
6173 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6174 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6175 nla[NFTA_SET_ELEM_DATA]);
6176 if (err < 0)
6177 goto err_parse_key_end;
6178
6179 dreg = nft_type_to_reg(set->dtype);
6180 list_for_each_entry(binding, &set->bindings, list) {
6181 struct nft_ctx bind_ctx = {
6182 .net = ctx->net,
6183 .family = ctx->family,
6184 .table = ctx->table,
6185 .chain = (struct nft_chain *)binding->chain,
6186 };
6187
6188 if (!(binding->flags & NFT_SET_MAP))
6189 continue;
6190
6191 err = nft_validate_register_store(&bind_ctx, dreg,
6192 &elem.data.val,
6193 desc.type, desc.len);
6194 if (err < 0)
6195 goto err_parse_data;
6196
6197 if (desc.type == NFT_DATA_VERDICT &&
6198 (elem.data.val.verdict.code == NFT_GOTO ||
6199 elem.data.val.verdict.code == NFT_JUMP))
6200 nft_validate_state_update(ctx->net,
6201 NFT_VALIDATE_NEED);
6202 }
6203
6204 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6205 if (err < 0)
6206 goto err_parse_data;
6207 }
6208
6209 /* The full maximum length of userdata can exceed the maximum
6210 * offset value (U8_MAX) for following extensions, therefor it
6211 * must be the last extension added.
6212 */
6213 ulen = 0;
6214 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6215 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6216 if (ulen > 0) {
6217 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6218 ulen);
6219 if (err < 0)
6220 goto err_parse_data;
6221 }
6222 }
6223
6224 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6225 elem.key_end.val.data, elem.data.val.data,
6226 timeout, expiration, GFP_KERNEL_ACCOUNT);
6227 if (IS_ERR(elem.priv)) {
6228 err = PTR_ERR(elem.priv);
6229 goto err_parse_data;
6230 }
6231
6232 ext = nft_set_elem_ext(set, elem.priv);
6233 if (flags)
6234 *nft_set_ext_flags(ext) = flags;
6235
6236 if (ulen > 0) {
6237 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6238 err = -EINVAL;
6239 goto err_elem_userdata;
6240 }
6241 udata = nft_set_ext_userdata(ext);
6242 udata->len = ulen - 1;
6243 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6244 }
6245 if (obj) {
6246 *nft_set_ext_obj(ext) = obj;
6247 obj->use++;
6248 }
6249 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6250 if (err < 0)
6251 goto err_elem_free;
6252
6253 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6254 if (trans == NULL) {
6255 err = -ENOMEM;
6256 goto err_elem_free;
6257 }
6258
6259 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6260
6261 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6262 if (err) {
6263 if (err == -EEXIST) {
6264 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6265 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6266 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6267 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6268 goto err_element_clash;
6269 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6270 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6271 memcmp(nft_set_ext_data(ext),
6272 nft_set_ext_data(ext2), set->dlen) != 0) ||
6273 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6274 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6275 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6276 goto err_element_clash;
6277 else if (!(nlmsg_flags & NLM_F_EXCL))
6278 err = 0;
6279 } else if (err == -ENOTEMPTY) {
6280 /* ENOTEMPTY reports overlapping between this element
6281 * and an existing one.
6282 */
6283 err = -EEXIST;
6284 }
6285 goto err_element_clash;
6286 }
6287
6288 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6289 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6290 err = -ENFILE;
6291 goto err_set_full;
6292 }
6293
6294 nft_trans_elem(trans) = elem;
6295 nft_trans_commit_list_add_tail(ctx->net, trans);
6296 return 0;
6297
6298 err_set_full:
6299 nft_setelem_remove(ctx->net, set, &elem);
6300 err_element_clash:
6301 kfree(trans);
6302 err_elem_free:
6303 if (obj)
6304 obj->use--;
6305 err_elem_userdata:
6306 nf_tables_set_elem_destroy(ctx, set, elem.priv);
6307 err_parse_data:
6308 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6309 nft_data_release(&elem.data.val, desc.type);
6310 err_parse_key_end:
6311 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6312 err_parse_key:
6313 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6314 err_set_elem_expr:
6315 for (i = 0; i < num_exprs && expr_array[i]; i++)
6316 nft_expr_destroy(ctx, expr_array[i]);
6317 err_set_elem_expr_clone:
6318 return err;
6319 }
6320
nf_tables_newsetelem(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])6321 static int nf_tables_newsetelem(struct sk_buff *skb,
6322 const struct nfnl_info *info,
6323 const struct nlattr * const nla[])
6324 {
6325 struct nftables_pernet *nft_net = nft_pernet(info->net);
6326 struct netlink_ext_ack *extack = info->extack;
6327 u8 genmask = nft_genmask_next(info->net);
6328 u8 family = info->nfmsg->nfgen_family;
6329 struct net *net = info->net;
6330 const struct nlattr *attr;
6331 struct nft_table *table;
6332 struct nft_set *set;
6333 struct nft_ctx ctx;
6334 int rem, err;
6335
6336 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6337 return -EINVAL;
6338
6339 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6340 genmask, NETLINK_CB(skb).portid);
6341 if (IS_ERR(table)) {
6342 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6343 return PTR_ERR(table);
6344 }
6345
6346 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6347 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6348 if (IS_ERR(set))
6349 return PTR_ERR(set);
6350
6351 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6352 return -EBUSY;
6353
6354 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6355
6356 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6357 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6358 if (err < 0) {
6359 NL_SET_BAD_ATTR(extack, attr);
6360 return err;
6361 }
6362 }
6363
6364 if (nft_net->validate_state == NFT_VALIDATE_DO)
6365 return nft_table_validate(net, table);
6366
6367 return 0;
6368 }
6369
6370 /**
6371 * nft_data_hold - hold a nft_data item
6372 *
6373 * @data: struct nft_data to release
6374 * @type: type of data
6375 *
6376 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6377 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6378 * NFT_GOTO verdicts. This function must be called on active data objects
6379 * from the second phase of the commit protocol.
6380 */
nft_data_hold(const struct nft_data * data,enum nft_data_types type)6381 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6382 {
6383 struct nft_chain *chain;
6384 struct nft_rule *rule;
6385
6386 if (type == NFT_DATA_VERDICT) {
6387 switch (data->verdict.code) {
6388 case NFT_JUMP:
6389 case NFT_GOTO:
6390 chain = data->verdict.chain;
6391 chain->use++;
6392
6393 if (!nft_chain_is_bound(chain))
6394 break;
6395
6396 chain->table->use++;
6397 list_for_each_entry(rule, &chain->rules, list)
6398 chain->use++;
6399
6400 nft_chain_add(chain->table, chain);
6401 break;
6402 }
6403 }
6404 }
6405
nft_setelem_data_activate(const struct net * net,const struct nft_set * set,struct nft_set_elem * elem)6406 static void nft_setelem_data_activate(const struct net *net,
6407 const struct nft_set *set,
6408 struct nft_set_elem *elem)
6409 {
6410 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6411
6412 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6413 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6414 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6415 (*nft_set_ext_obj(ext))->use++;
6416 }
6417
nft_setelem_data_deactivate(const struct net * net,const struct nft_set * set,struct nft_set_elem * elem)6418 static void nft_setelem_data_deactivate(const struct net *net,
6419 const struct nft_set *set,
6420 struct nft_set_elem *elem)
6421 {
6422 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6423
6424 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6425 nft_data_release(nft_set_ext_data(ext), set->dtype);
6426 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6427 (*nft_set_ext_obj(ext))->use--;
6428 }
6429
nft_del_setelem(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * attr)6430 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6431 const struct nlattr *attr)
6432 {
6433 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6434 struct nft_set_ext_tmpl tmpl;
6435 struct nft_set_elem elem;
6436 struct nft_set_ext *ext;
6437 struct nft_trans *trans;
6438 u32 flags = 0;
6439 int err;
6440
6441 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6442 nft_set_elem_policy, NULL);
6443 if (err < 0)
6444 return err;
6445
6446 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6447 if (err < 0)
6448 return err;
6449
6450 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6451 return -EINVAL;
6452
6453 if (!nft_setelem_valid_key_end(set, nla, flags))
6454 return -EINVAL;
6455
6456 nft_set_ext_prepare(&tmpl);
6457
6458 if (flags != 0) {
6459 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6460 if (err < 0)
6461 return err;
6462 }
6463
6464 if (nla[NFTA_SET_ELEM_KEY]) {
6465 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6466 nla[NFTA_SET_ELEM_KEY]);
6467 if (err < 0)
6468 return err;
6469
6470 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6471 if (err < 0)
6472 goto fail_elem;
6473 }
6474
6475 if (nla[NFTA_SET_ELEM_KEY_END]) {
6476 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6477 nla[NFTA_SET_ELEM_KEY_END]);
6478 if (err < 0)
6479 goto fail_elem;
6480
6481 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6482 if (err < 0)
6483 goto fail_elem_key_end;
6484 }
6485
6486 err = -ENOMEM;
6487 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6488 elem.key_end.val.data, NULL, 0, 0,
6489 GFP_KERNEL_ACCOUNT);
6490 if (IS_ERR(elem.priv)) {
6491 err = PTR_ERR(elem.priv);
6492 goto fail_elem_key_end;
6493 }
6494
6495 ext = nft_set_elem_ext(set, elem.priv);
6496 if (flags)
6497 *nft_set_ext_flags(ext) = flags;
6498
6499 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6500 if (trans == NULL)
6501 goto fail_trans;
6502
6503 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6504 if (err < 0)
6505 goto fail_ops;
6506
6507 nft_setelem_data_deactivate(ctx->net, set, &elem);
6508
6509 nft_trans_elem(trans) = elem;
6510 nft_trans_commit_list_add_tail(ctx->net, trans);
6511 return 0;
6512
6513 fail_ops:
6514 kfree(trans);
6515 fail_trans:
6516 kfree(elem.priv);
6517 fail_elem_key_end:
6518 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6519 fail_elem:
6520 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6521 return err;
6522 }
6523
nft_setelem_flush(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)6524 static int nft_setelem_flush(const struct nft_ctx *ctx,
6525 struct nft_set *set,
6526 const struct nft_set_iter *iter,
6527 struct nft_set_elem *elem)
6528 {
6529 struct nft_trans *trans;
6530 int err;
6531
6532 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6533 sizeof(struct nft_trans_elem), GFP_ATOMIC);
6534 if (!trans)
6535 return -ENOMEM;
6536
6537 if (!set->ops->flush(ctx->net, set, elem->priv)) {
6538 err = -ENOENT;
6539 goto err1;
6540 }
6541 set->ndeact++;
6542
6543 nft_setelem_data_deactivate(ctx->net, set, elem);
6544 nft_trans_elem_set(trans) = set;
6545 nft_trans_elem(trans) = *elem;
6546 nft_trans_commit_list_add_tail(ctx->net, trans);
6547
6548 return 0;
6549 err1:
6550 kfree(trans);
6551 return err;
6552 }
6553
__nft_set_catchall_flush(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_elem * elem)6554 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6555 struct nft_set *set,
6556 struct nft_set_elem *elem)
6557 {
6558 struct nft_trans *trans;
6559
6560 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6561 sizeof(struct nft_trans_elem), GFP_KERNEL);
6562 if (!trans)
6563 return -ENOMEM;
6564
6565 nft_setelem_data_deactivate(ctx->net, set, elem);
6566 nft_trans_elem_set(trans) = set;
6567 nft_trans_elem(trans) = *elem;
6568 nft_trans_commit_list_add_tail(ctx->net, trans);
6569
6570 return 0;
6571 }
6572
nft_set_catchall_flush(const struct nft_ctx * ctx,struct nft_set * set)6573 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6574 struct nft_set *set)
6575 {
6576 u8 genmask = nft_genmask_next(ctx->net);
6577 struct nft_set_elem_catchall *catchall;
6578 struct nft_set_elem elem;
6579 struct nft_set_ext *ext;
6580 int ret = 0;
6581
6582 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6583 ext = nft_set_elem_ext(set, catchall->elem);
6584 if (!nft_set_elem_active(ext, genmask) ||
6585 nft_set_elem_mark_busy(ext))
6586 continue;
6587
6588 elem.priv = catchall->elem;
6589 ret = __nft_set_catchall_flush(ctx, set, &elem);
6590 if (ret < 0)
6591 break;
6592 }
6593
6594 return ret;
6595 }
6596
nft_set_flush(struct nft_ctx * ctx,struct nft_set * set,u8 genmask)6597 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6598 {
6599 struct nft_set_iter iter = {
6600 .genmask = genmask,
6601 .fn = nft_setelem_flush,
6602 };
6603
6604 set->ops->walk(ctx, set, &iter);
6605 if (!iter.err)
6606 iter.err = nft_set_catchall_flush(ctx, set);
6607
6608 return iter.err;
6609 }
6610
nf_tables_delsetelem(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])6611 static int nf_tables_delsetelem(struct sk_buff *skb,
6612 const struct nfnl_info *info,
6613 const struct nlattr * const nla[])
6614 {
6615 struct netlink_ext_ack *extack = info->extack;
6616 u8 genmask = nft_genmask_next(info->net);
6617 u8 family = info->nfmsg->nfgen_family;
6618 struct net *net = info->net;
6619 const struct nlattr *attr;
6620 struct nft_table *table;
6621 struct nft_set *set;
6622 struct nft_ctx ctx;
6623 int rem, err = 0;
6624
6625 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6626 genmask, NETLINK_CB(skb).portid);
6627 if (IS_ERR(table)) {
6628 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6629 return PTR_ERR(table);
6630 }
6631
6632 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6633 if (IS_ERR(set))
6634 return PTR_ERR(set);
6635 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6636 return -EBUSY;
6637
6638 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6639
6640 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6641 return nft_set_flush(&ctx, set, genmask);
6642
6643 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6644 err = nft_del_setelem(&ctx, set, attr);
6645 if (err < 0) {
6646 NL_SET_BAD_ATTR(extack, attr);
6647 break;
6648 }
6649 }
6650 return err;
6651 }
6652
nft_set_gc_batch_release(struct rcu_head * rcu)6653 void nft_set_gc_batch_release(struct rcu_head *rcu)
6654 {
6655 struct nft_set_gc_batch *gcb;
6656 unsigned int i;
6657
6658 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6659 for (i = 0; i < gcb->head.cnt; i++)
6660 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6661 kfree(gcb);
6662 }
6663
nft_set_gc_batch_alloc(const struct nft_set * set,gfp_t gfp)6664 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6665 gfp_t gfp)
6666 {
6667 struct nft_set_gc_batch *gcb;
6668
6669 gcb = kzalloc(sizeof(*gcb), gfp);
6670 if (gcb == NULL)
6671 return gcb;
6672 gcb->head.set = set;
6673 return gcb;
6674 }
6675
6676 /*
6677 * Stateful objects
6678 */
6679
6680 /**
6681 * nft_register_obj- register nf_tables stateful object type
6682 * @obj_type: object type
6683 *
6684 * Registers the object type for use with nf_tables. Returns zero on
6685 * success or a negative errno code otherwise.
6686 */
nft_register_obj(struct nft_object_type * obj_type)6687 int nft_register_obj(struct nft_object_type *obj_type)
6688 {
6689 if (obj_type->type == NFT_OBJECT_UNSPEC)
6690 return -EINVAL;
6691
6692 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6693 list_add_rcu(&obj_type->list, &nf_tables_objects);
6694 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6695 return 0;
6696 }
6697 EXPORT_SYMBOL_GPL(nft_register_obj);
6698
6699 /**
6700 * nft_unregister_obj - unregister nf_tables object type
6701 * @obj_type: object type
6702 *
6703 * Unregisters the object type for use with nf_tables.
6704 */
nft_unregister_obj(struct nft_object_type * obj_type)6705 void nft_unregister_obj(struct nft_object_type *obj_type)
6706 {
6707 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6708 list_del_rcu(&obj_type->list);
6709 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6710 }
6711 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6712
nft_obj_lookup(const struct net * net,const struct nft_table * table,const struct nlattr * nla,u32 objtype,u8 genmask)6713 struct nft_object *nft_obj_lookup(const struct net *net,
6714 const struct nft_table *table,
6715 const struct nlattr *nla, u32 objtype,
6716 u8 genmask)
6717 {
6718 struct nft_object_hash_key k = { .table = table };
6719 char search[NFT_OBJ_MAXNAMELEN];
6720 struct rhlist_head *tmp, *list;
6721 struct nft_object *obj;
6722
6723 nla_strscpy(search, nla, sizeof(search));
6724 k.name = search;
6725
6726 WARN_ON_ONCE(!rcu_read_lock_held() &&
6727 !lockdep_commit_lock_is_held(net));
6728
6729 rcu_read_lock();
6730 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6731 if (!list)
6732 goto out;
6733
6734 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6735 if (objtype == obj->ops->type->type &&
6736 nft_active_genmask(obj, genmask)) {
6737 rcu_read_unlock();
6738 return obj;
6739 }
6740 }
6741 out:
6742 rcu_read_unlock();
6743 return ERR_PTR(-ENOENT);
6744 }
6745 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6746
nft_obj_lookup_byhandle(const struct nft_table * table,const struct nlattr * nla,u32 objtype,u8 genmask)6747 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6748 const struct nlattr *nla,
6749 u32 objtype, u8 genmask)
6750 {
6751 struct nft_object *obj;
6752
6753 list_for_each_entry(obj, &table->objects, list) {
6754 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6755 objtype == obj->ops->type->type &&
6756 nft_active_genmask(obj, genmask))
6757 return obj;
6758 }
6759 return ERR_PTR(-ENOENT);
6760 }
6761
6762 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6763 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
6764 .len = NFT_TABLE_MAXNAMELEN - 1 },
6765 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
6766 .len = NFT_OBJ_MAXNAMELEN - 1 },
6767 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
6768 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
6769 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
6770 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
6771 .len = NFT_USERDATA_MAXLEN },
6772 };
6773
nft_obj_init(const struct nft_ctx * ctx,const struct nft_object_type * type,const struct nlattr * attr)6774 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6775 const struct nft_object_type *type,
6776 const struct nlattr *attr)
6777 {
6778 struct nlattr **tb;
6779 const struct nft_object_ops *ops;
6780 struct nft_object *obj;
6781 int err = -ENOMEM;
6782
6783 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6784 if (!tb)
6785 goto err1;
6786
6787 if (attr) {
6788 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6789 type->policy, NULL);
6790 if (err < 0)
6791 goto err2;
6792 } else {
6793 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6794 }
6795
6796 if (type->select_ops) {
6797 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6798 if (IS_ERR(ops)) {
6799 err = PTR_ERR(ops);
6800 goto err2;
6801 }
6802 } else {
6803 ops = type->ops;
6804 }
6805
6806 err = -ENOMEM;
6807 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
6808 if (!obj)
6809 goto err2;
6810
6811 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6812 if (err < 0)
6813 goto err3;
6814
6815 obj->ops = ops;
6816
6817 kfree(tb);
6818 return obj;
6819 err3:
6820 kfree(obj);
6821 err2:
6822 kfree(tb);
6823 err1:
6824 return ERR_PTR(err);
6825 }
6826
nft_object_dump(struct sk_buff * skb,unsigned int attr,struct nft_object * obj,bool reset)6827 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6828 struct nft_object *obj, bool reset)
6829 {
6830 struct nlattr *nest;
6831
6832 nest = nla_nest_start_noflag(skb, attr);
6833 if (!nest)
6834 goto nla_put_failure;
6835 if (obj->ops->dump(skb, obj, reset) < 0)
6836 goto nla_put_failure;
6837 nla_nest_end(skb, nest);
6838 return 0;
6839
6840 nla_put_failure:
6841 return -1;
6842 }
6843
__nft_obj_type_get(u32 objtype)6844 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6845 {
6846 const struct nft_object_type *type;
6847
6848 list_for_each_entry(type, &nf_tables_objects, list) {
6849 if (objtype == type->type)
6850 return type;
6851 }
6852 return NULL;
6853 }
6854
6855 static const struct nft_object_type *
nft_obj_type_get(struct net * net,u32 objtype)6856 nft_obj_type_get(struct net *net, u32 objtype)
6857 {
6858 const struct nft_object_type *type;
6859
6860 type = __nft_obj_type_get(objtype);
6861 if (type != NULL && try_module_get(type->owner))
6862 return type;
6863
6864 lockdep_nfnl_nft_mutex_not_held();
6865 #ifdef CONFIG_MODULES
6866 if (type == NULL) {
6867 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6868 return ERR_PTR(-EAGAIN);
6869 }
6870 #endif
6871 return ERR_PTR(-ENOENT);
6872 }
6873
nf_tables_updobj(const struct nft_ctx * ctx,const struct nft_object_type * type,const struct nlattr * attr,struct nft_object * obj)6874 static int nf_tables_updobj(const struct nft_ctx *ctx,
6875 const struct nft_object_type *type,
6876 const struct nlattr *attr,
6877 struct nft_object *obj)
6878 {
6879 struct nft_object *newobj;
6880 struct nft_trans *trans;
6881 int err = -ENOMEM;
6882
6883 if (!try_module_get(type->owner))
6884 return -ENOENT;
6885
6886 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6887 sizeof(struct nft_trans_obj));
6888 if (!trans)
6889 goto err_trans;
6890
6891 newobj = nft_obj_init(ctx, type, attr);
6892 if (IS_ERR(newobj)) {
6893 err = PTR_ERR(newobj);
6894 goto err_free_trans;
6895 }
6896
6897 nft_trans_obj(trans) = obj;
6898 nft_trans_obj_update(trans) = true;
6899 nft_trans_obj_newobj(trans) = newobj;
6900 nft_trans_commit_list_add_tail(ctx->net, trans);
6901
6902 return 0;
6903
6904 err_free_trans:
6905 kfree(trans);
6906 err_trans:
6907 module_put(type->owner);
6908 return err;
6909 }
6910
nf_tables_newobj(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])6911 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6912 const struct nlattr * const nla[])
6913 {
6914 struct netlink_ext_ack *extack = info->extack;
6915 u8 genmask = nft_genmask_next(info->net);
6916 u8 family = info->nfmsg->nfgen_family;
6917 const struct nft_object_type *type;
6918 struct net *net = info->net;
6919 struct nft_table *table;
6920 struct nft_object *obj;
6921 struct nft_ctx ctx;
6922 u32 objtype;
6923 int err;
6924
6925 if (!nla[NFTA_OBJ_TYPE] ||
6926 !nla[NFTA_OBJ_NAME] ||
6927 !nla[NFTA_OBJ_DATA])
6928 return -EINVAL;
6929
6930 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6931 NETLINK_CB(skb).portid);
6932 if (IS_ERR(table)) {
6933 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6934 return PTR_ERR(table);
6935 }
6936
6937 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6938 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6939 if (IS_ERR(obj)) {
6940 err = PTR_ERR(obj);
6941 if (err != -ENOENT) {
6942 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6943 return err;
6944 }
6945 } else {
6946 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6947 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6948 return -EEXIST;
6949 }
6950 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6951 return -EOPNOTSUPP;
6952
6953 type = __nft_obj_type_get(objtype);
6954 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6955
6956 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6957 }
6958
6959 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6960
6961 type = nft_obj_type_get(net, objtype);
6962 if (IS_ERR(type))
6963 return PTR_ERR(type);
6964
6965 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6966 if (IS_ERR(obj)) {
6967 err = PTR_ERR(obj);
6968 goto err_init;
6969 }
6970 obj->key.table = table;
6971 obj->handle = nf_tables_alloc_handle(table);
6972
6973 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
6974 if (!obj->key.name) {
6975 err = -ENOMEM;
6976 goto err_strdup;
6977 }
6978
6979 if (nla[NFTA_OBJ_USERDATA]) {
6980 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6981 if (obj->udata == NULL)
6982 goto err_userdata;
6983
6984 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6985 }
6986
6987 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6988 if (err < 0)
6989 goto err_trans;
6990
6991 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6992 nft_objname_ht_params);
6993 if (err < 0)
6994 goto err_obj_ht;
6995
6996 list_add_tail_rcu(&obj->list, &table->objects);
6997 table->use++;
6998 return 0;
6999 err_obj_ht:
7000 /* queued in transaction log */
7001 INIT_LIST_HEAD(&obj->list);
7002 return err;
7003 err_trans:
7004 kfree(obj->udata);
7005 err_userdata:
7006 kfree(obj->key.name);
7007 err_strdup:
7008 if (obj->ops->destroy)
7009 obj->ops->destroy(&ctx, obj);
7010 kfree(obj);
7011 err_init:
7012 module_put(type->owner);
7013 return err;
7014 }
7015
nf_tables_fill_obj_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,int event,u32 flags,int family,const struct nft_table * table,struct nft_object * obj,bool reset)7016 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7017 u32 portid, u32 seq, int event, u32 flags,
7018 int family, const struct nft_table *table,
7019 struct nft_object *obj, bool reset)
7020 {
7021 struct nlmsghdr *nlh;
7022
7023 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7024 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7025 NFNETLINK_V0, nft_base_seq(net));
7026 if (!nlh)
7027 goto nla_put_failure;
7028
7029 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7030 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7031 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7032 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7033 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
7034 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7035 NFTA_OBJ_PAD))
7036 goto nla_put_failure;
7037
7038 if (obj->udata &&
7039 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7040 goto nla_put_failure;
7041
7042 nlmsg_end(skb, nlh);
7043 return 0;
7044
7045 nla_put_failure:
7046 nlmsg_trim(skb, nlh);
7047 return -1;
7048 }
7049
7050 struct nft_obj_filter {
7051 char *table;
7052 u32 type;
7053 };
7054
nf_tables_dump_obj(struct sk_buff * skb,struct netlink_callback * cb)7055 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7056 {
7057 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7058 const struct nft_table *table;
7059 unsigned int idx = 0, s_idx = cb->args[0];
7060 struct nft_obj_filter *filter = cb->data;
7061 struct net *net = sock_net(skb->sk);
7062 int family = nfmsg->nfgen_family;
7063 struct nftables_pernet *nft_net;
7064 struct nft_object *obj;
7065 bool reset = false;
7066
7067 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7068 reset = true;
7069
7070 rcu_read_lock();
7071 nft_net = nft_pernet(net);
7072 cb->seq = READ_ONCE(nft_net->base_seq);
7073
7074 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7075 if (family != NFPROTO_UNSPEC && family != table->family)
7076 continue;
7077
7078 list_for_each_entry_rcu(obj, &table->objects, list) {
7079 if (!nft_is_active(net, obj))
7080 goto cont;
7081 if (idx < s_idx)
7082 goto cont;
7083 if (idx > s_idx)
7084 memset(&cb->args[1], 0,
7085 sizeof(cb->args) - sizeof(cb->args[0]));
7086 if (filter && filter->table &&
7087 strcmp(filter->table, table->name))
7088 goto cont;
7089 if (filter &&
7090 filter->type != NFT_OBJECT_UNSPEC &&
7091 obj->ops->type->type != filter->type)
7092 goto cont;
7093 if (reset) {
7094 char *buf = kasprintf(GFP_ATOMIC,
7095 "%s:%u",
7096 table->name,
7097 nft_net->base_seq);
7098
7099 audit_log_nfcfg(buf,
7100 family,
7101 obj->handle,
7102 AUDIT_NFT_OP_OBJ_RESET,
7103 GFP_ATOMIC);
7104 kfree(buf);
7105 }
7106
7107 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7108 cb->nlh->nlmsg_seq,
7109 NFT_MSG_NEWOBJ,
7110 NLM_F_MULTI | NLM_F_APPEND,
7111 table->family, table,
7112 obj, reset) < 0)
7113 goto done;
7114
7115 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7116 cont:
7117 idx++;
7118 }
7119 }
7120 done:
7121 rcu_read_unlock();
7122
7123 cb->args[0] = idx;
7124 return skb->len;
7125 }
7126
nf_tables_dump_obj_start(struct netlink_callback * cb)7127 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7128 {
7129 const struct nlattr * const *nla = cb->data;
7130 struct nft_obj_filter *filter = NULL;
7131
7132 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7133 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7134 if (!filter)
7135 return -ENOMEM;
7136
7137 if (nla[NFTA_OBJ_TABLE]) {
7138 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7139 if (!filter->table) {
7140 kfree(filter);
7141 return -ENOMEM;
7142 }
7143 }
7144
7145 if (nla[NFTA_OBJ_TYPE])
7146 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7147 }
7148
7149 cb->data = filter;
7150 return 0;
7151 }
7152
nf_tables_dump_obj_done(struct netlink_callback * cb)7153 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7154 {
7155 struct nft_obj_filter *filter = cb->data;
7156
7157 if (filter) {
7158 kfree(filter->table);
7159 kfree(filter);
7160 }
7161
7162 return 0;
7163 }
7164
7165 /* called with rcu_read_lock held */
nf_tables_getobj(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7166 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7167 const struct nlattr * const nla[])
7168 {
7169 struct netlink_ext_ack *extack = info->extack;
7170 u8 genmask = nft_genmask_cur(info->net);
7171 u8 family = info->nfmsg->nfgen_family;
7172 const struct nft_table *table;
7173 struct net *net = info->net;
7174 struct nft_object *obj;
7175 struct sk_buff *skb2;
7176 bool reset = false;
7177 u32 objtype;
7178 int err;
7179
7180 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7181 struct netlink_dump_control c = {
7182 .start = nf_tables_dump_obj_start,
7183 .dump = nf_tables_dump_obj,
7184 .done = nf_tables_dump_obj_done,
7185 .module = THIS_MODULE,
7186 .data = (void *)nla,
7187 };
7188
7189 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7190 }
7191
7192 if (!nla[NFTA_OBJ_NAME] ||
7193 !nla[NFTA_OBJ_TYPE])
7194 return -EINVAL;
7195
7196 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7197 if (IS_ERR(table)) {
7198 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7199 return PTR_ERR(table);
7200 }
7201
7202 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7203 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7204 if (IS_ERR(obj)) {
7205 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7206 return PTR_ERR(obj);
7207 }
7208
7209 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7210 if (!skb2)
7211 return -ENOMEM;
7212
7213 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7214 reset = true;
7215
7216 if (reset) {
7217 const struct nftables_pernet *nft_net;
7218 char *buf;
7219
7220 nft_net = nft_pernet(net);
7221 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7222
7223 audit_log_nfcfg(buf,
7224 family,
7225 obj->handle,
7226 AUDIT_NFT_OP_OBJ_RESET,
7227 GFP_ATOMIC);
7228 kfree(buf);
7229 }
7230
7231 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7232 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7233 family, table, obj, reset);
7234 if (err < 0)
7235 goto err_fill_obj_info;
7236
7237 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7238
7239 err_fill_obj_info:
7240 kfree_skb(skb2);
7241 return err;
7242 }
7243
nft_obj_destroy(const struct nft_ctx * ctx,struct nft_object * obj)7244 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7245 {
7246 if (obj->ops->destroy)
7247 obj->ops->destroy(ctx, obj);
7248
7249 module_put(obj->ops->type->owner);
7250 kfree(obj->key.name);
7251 kfree(obj->udata);
7252 kfree(obj);
7253 }
7254
nf_tables_delobj(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7255 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7256 const struct nlattr * const nla[])
7257 {
7258 struct netlink_ext_ack *extack = info->extack;
7259 u8 genmask = nft_genmask_next(info->net);
7260 u8 family = info->nfmsg->nfgen_family;
7261 struct net *net = info->net;
7262 const struct nlattr *attr;
7263 struct nft_table *table;
7264 struct nft_object *obj;
7265 struct nft_ctx ctx;
7266 u32 objtype;
7267
7268 if (!nla[NFTA_OBJ_TYPE] ||
7269 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7270 return -EINVAL;
7271
7272 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7273 NETLINK_CB(skb).portid);
7274 if (IS_ERR(table)) {
7275 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7276 return PTR_ERR(table);
7277 }
7278
7279 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7280 if (nla[NFTA_OBJ_HANDLE]) {
7281 attr = nla[NFTA_OBJ_HANDLE];
7282 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7283 } else {
7284 attr = nla[NFTA_OBJ_NAME];
7285 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7286 }
7287
7288 if (IS_ERR(obj)) {
7289 NL_SET_BAD_ATTR(extack, attr);
7290 return PTR_ERR(obj);
7291 }
7292 if (obj->use > 0) {
7293 NL_SET_BAD_ATTR(extack, attr);
7294 return -EBUSY;
7295 }
7296
7297 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7298
7299 return nft_delobj(&ctx, obj);
7300 }
7301
nft_obj_notify(struct net * net,const struct nft_table * table,struct nft_object * obj,u32 portid,u32 seq,int event,u16 flags,int family,int report,gfp_t gfp)7302 void nft_obj_notify(struct net *net, const struct nft_table *table,
7303 struct nft_object *obj, u32 portid, u32 seq, int event,
7304 u16 flags, int family, int report, gfp_t gfp)
7305 {
7306 struct nftables_pernet *nft_net = nft_pernet(net);
7307 struct sk_buff *skb;
7308 int err;
7309 char *buf = kasprintf(gfp, "%s:%u",
7310 table->name, nft_net->base_seq);
7311
7312 audit_log_nfcfg(buf,
7313 family,
7314 obj->handle,
7315 event == NFT_MSG_NEWOBJ ?
7316 AUDIT_NFT_OP_OBJ_REGISTER :
7317 AUDIT_NFT_OP_OBJ_UNREGISTER,
7318 gfp);
7319 kfree(buf);
7320
7321 if (!report &&
7322 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7323 return;
7324
7325 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7326 if (skb == NULL)
7327 goto err;
7328
7329 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7330 flags & (NLM_F_CREATE | NLM_F_EXCL),
7331 family, table, obj, false);
7332 if (err < 0) {
7333 kfree_skb(skb);
7334 goto err;
7335 }
7336
7337 nft_notify_enqueue(skb, report, &nft_net->notify_list);
7338 return;
7339 err:
7340 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7341 }
7342 EXPORT_SYMBOL_GPL(nft_obj_notify);
7343
nf_tables_obj_notify(const struct nft_ctx * ctx,struct nft_object * obj,int event)7344 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7345 struct nft_object *obj, int event)
7346 {
7347 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7348 ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7349 }
7350
7351 /*
7352 * Flow tables
7353 */
nft_register_flowtable_type(struct nf_flowtable_type * type)7354 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7355 {
7356 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7357 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7358 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7359 }
7360 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7361
nft_unregister_flowtable_type(struct nf_flowtable_type * type)7362 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7363 {
7364 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7365 list_del_rcu(&type->list);
7366 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7367 }
7368 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7369
7370 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7371 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7372 .len = NFT_NAME_MAXLEN - 1 },
7373 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7374 .len = NFT_NAME_MAXLEN - 1 },
7375 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
7376 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
7377 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
7378 };
7379
nft_flowtable_lookup(const struct nft_table * table,const struct nlattr * nla,u8 genmask)7380 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7381 const struct nlattr *nla, u8 genmask)
7382 {
7383 struct nft_flowtable *flowtable;
7384
7385 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7386 if (!nla_strcmp(nla, flowtable->name) &&
7387 nft_active_genmask(flowtable, genmask))
7388 return flowtable;
7389 }
7390 return ERR_PTR(-ENOENT);
7391 }
7392 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7393
nf_tables_deactivate_flowtable(const struct nft_ctx * ctx,struct nft_flowtable * flowtable,enum nft_trans_phase phase)7394 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7395 struct nft_flowtable *flowtable,
7396 enum nft_trans_phase phase)
7397 {
7398 switch (phase) {
7399 case NFT_TRANS_PREPARE:
7400 case NFT_TRANS_ABORT:
7401 case NFT_TRANS_RELEASE:
7402 flowtable->use--;
7403 fallthrough;
7404 default:
7405 return;
7406 }
7407 }
7408 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7409
7410 static struct nft_flowtable *
nft_flowtable_lookup_byhandle(const struct nft_table * table,const struct nlattr * nla,u8 genmask)7411 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7412 const struct nlattr *nla, u8 genmask)
7413 {
7414 struct nft_flowtable *flowtable;
7415
7416 list_for_each_entry(flowtable, &table->flowtables, list) {
7417 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7418 nft_active_genmask(flowtable, genmask))
7419 return flowtable;
7420 }
7421 return ERR_PTR(-ENOENT);
7422 }
7423
7424 struct nft_flowtable_hook {
7425 u32 num;
7426 int priority;
7427 struct list_head list;
7428 };
7429
7430 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7431 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7432 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7433 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7434 };
7435
nft_flowtable_parse_hook(const struct nft_ctx * ctx,const struct nlattr * attr,struct nft_flowtable_hook * flowtable_hook,struct nft_flowtable * flowtable,bool add)7436 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7437 const struct nlattr *attr,
7438 struct nft_flowtable_hook *flowtable_hook,
7439 struct nft_flowtable *flowtable, bool add)
7440 {
7441 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7442 struct nft_hook *hook;
7443 int hooknum, priority;
7444 int err;
7445
7446 INIT_LIST_HEAD(&flowtable_hook->list);
7447
7448 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7449 nft_flowtable_hook_policy, NULL);
7450 if (err < 0)
7451 return err;
7452
7453 if (add) {
7454 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7455 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7456 return -EINVAL;
7457
7458 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7459 if (hooknum != NF_NETDEV_INGRESS)
7460 return -EOPNOTSUPP;
7461
7462 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7463
7464 flowtable_hook->priority = priority;
7465 flowtable_hook->num = hooknum;
7466 } else {
7467 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7468 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7469 if (hooknum != flowtable->hooknum)
7470 return -EOPNOTSUPP;
7471 }
7472
7473 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7474 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7475 if (priority != flowtable->data.priority)
7476 return -EOPNOTSUPP;
7477 }
7478
7479 flowtable_hook->priority = flowtable->data.priority;
7480 flowtable_hook->num = flowtable->hooknum;
7481 }
7482
7483 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7484 err = nf_tables_parse_netdev_hooks(ctx->net,
7485 tb[NFTA_FLOWTABLE_HOOK_DEVS],
7486 &flowtable_hook->list);
7487 if (err < 0)
7488 return err;
7489 }
7490
7491 list_for_each_entry(hook, &flowtable_hook->list, list) {
7492 hook->ops.pf = NFPROTO_NETDEV;
7493 hook->ops.hooknum = flowtable_hook->num;
7494 hook->ops.priority = flowtable_hook->priority;
7495 hook->ops.priv = &flowtable->data;
7496 hook->ops.hook = flowtable->data.type->hook;
7497 }
7498
7499 return err;
7500 }
7501
__nft_flowtable_type_get(u8 family)7502 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7503 {
7504 const struct nf_flowtable_type *type;
7505
7506 list_for_each_entry(type, &nf_tables_flowtables, list) {
7507 if (family == type->family)
7508 return type;
7509 }
7510 return NULL;
7511 }
7512
7513 static const struct nf_flowtable_type *
nft_flowtable_type_get(struct net * net,u8 family)7514 nft_flowtable_type_get(struct net *net, u8 family)
7515 {
7516 const struct nf_flowtable_type *type;
7517
7518 type = __nft_flowtable_type_get(family);
7519 if (type != NULL && try_module_get(type->owner))
7520 return type;
7521
7522 lockdep_nfnl_nft_mutex_not_held();
7523 #ifdef CONFIG_MODULES
7524 if (type == NULL) {
7525 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7526 return ERR_PTR(-EAGAIN);
7527 }
7528 #endif
7529 return ERR_PTR(-ENOENT);
7530 }
7531
7532 /* Only called from error and netdev event paths. */
nft_unregister_flowtable_hook(struct net * net,struct nft_flowtable * flowtable,struct nft_hook * hook)7533 static void nft_unregister_flowtable_hook(struct net *net,
7534 struct nft_flowtable *flowtable,
7535 struct nft_hook *hook)
7536 {
7537 nf_unregister_net_hook(net, &hook->ops);
7538 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7539 FLOW_BLOCK_UNBIND);
7540 }
7541
__nft_unregister_flowtable_net_hooks(struct net * net,struct list_head * hook_list,bool release_netdev)7542 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7543 struct list_head *hook_list,
7544 bool release_netdev)
7545 {
7546 struct nft_hook *hook, *next;
7547
7548 list_for_each_entry_safe(hook, next, hook_list, list) {
7549 nf_unregister_net_hook(net, &hook->ops);
7550 if (release_netdev) {
7551 list_del(&hook->list);
7552 kfree_rcu(hook, rcu);
7553 }
7554 }
7555 }
7556
nft_unregister_flowtable_net_hooks(struct net * net,struct list_head * hook_list)7557 static void nft_unregister_flowtable_net_hooks(struct net *net,
7558 struct list_head *hook_list)
7559 {
7560 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7561 }
7562
nft_register_flowtable_net_hooks(struct net * net,struct nft_table * table,struct list_head * hook_list,struct nft_flowtable * flowtable)7563 static int nft_register_flowtable_net_hooks(struct net *net,
7564 struct nft_table *table,
7565 struct list_head *hook_list,
7566 struct nft_flowtable *flowtable)
7567 {
7568 struct nft_hook *hook, *hook2, *next;
7569 struct nft_flowtable *ft;
7570 int err, i = 0;
7571
7572 list_for_each_entry(hook, hook_list, list) {
7573 list_for_each_entry(ft, &table->flowtables, list) {
7574 if (!nft_is_active_next(net, ft))
7575 continue;
7576
7577 list_for_each_entry(hook2, &ft->hook_list, list) {
7578 if (hook->ops.dev == hook2->ops.dev &&
7579 hook->ops.pf == hook2->ops.pf) {
7580 err = -EEXIST;
7581 goto err_unregister_net_hooks;
7582 }
7583 }
7584 }
7585
7586 err = flowtable->data.type->setup(&flowtable->data,
7587 hook->ops.dev,
7588 FLOW_BLOCK_BIND);
7589 if (err < 0)
7590 goto err_unregister_net_hooks;
7591
7592 err = nf_register_net_hook(net, &hook->ops);
7593 if (err < 0) {
7594 flowtable->data.type->setup(&flowtable->data,
7595 hook->ops.dev,
7596 FLOW_BLOCK_UNBIND);
7597 goto err_unregister_net_hooks;
7598 }
7599
7600 i++;
7601 }
7602
7603 return 0;
7604
7605 err_unregister_net_hooks:
7606 list_for_each_entry_safe(hook, next, hook_list, list) {
7607 if (i-- <= 0)
7608 break;
7609
7610 nft_unregister_flowtable_hook(net, flowtable, hook);
7611 list_del_rcu(&hook->list);
7612 kfree_rcu(hook, rcu);
7613 }
7614
7615 return err;
7616 }
7617
nft_flowtable_hooks_destroy(struct list_head * hook_list)7618 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7619 {
7620 struct nft_hook *hook, *next;
7621
7622 list_for_each_entry_safe(hook, next, hook_list, list) {
7623 list_del_rcu(&hook->list);
7624 kfree_rcu(hook, rcu);
7625 }
7626 }
7627
nft_flowtable_update(struct nft_ctx * ctx,const struct nlmsghdr * nlh,struct nft_flowtable * flowtable)7628 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7629 struct nft_flowtable *flowtable)
7630 {
7631 const struct nlattr * const *nla = ctx->nla;
7632 struct nft_flowtable_hook flowtable_hook;
7633 struct nft_hook *hook, *next;
7634 struct nft_trans *trans;
7635 bool unregister = false;
7636 u32 flags;
7637 int err;
7638
7639 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7640 &flowtable_hook, flowtable, false);
7641 if (err < 0)
7642 return err;
7643
7644 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7645 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7646 list_del(&hook->list);
7647 kfree(hook);
7648 }
7649 }
7650
7651 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7652 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7653 if (flags & ~NFT_FLOWTABLE_MASK) {
7654 err = -EOPNOTSUPP;
7655 goto err_flowtable_update_hook;
7656 }
7657 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7658 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7659 err = -EOPNOTSUPP;
7660 goto err_flowtable_update_hook;
7661 }
7662 } else {
7663 flags = flowtable->data.flags;
7664 }
7665
7666 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7667 &flowtable_hook.list, flowtable);
7668 if (err < 0)
7669 goto err_flowtable_update_hook;
7670
7671 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7672 sizeof(struct nft_trans_flowtable));
7673 if (!trans) {
7674 unregister = true;
7675 err = -ENOMEM;
7676 goto err_flowtable_update_hook;
7677 }
7678
7679 nft_trans_flowtable_flags(trans) = flags;
7680 nft_trans_flowtable(trans) = flowtable;
7681 nft_trans_flowtable_update(trans) = true;
7682 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7683 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7684
7685 nft_trans_commit_list_add_tail(ctx->net, trans);
7686
7687 return 0;
7688
7689 err_flowtable_update_hook:
7690 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7691 if (unregister)
7692 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7693 list_del_rcu(&hook->list);
7694 kfree_rcu(hook, rcu);
7695 }
7696
7697 return err;
7698
7699 }
7700
nf_tables_newflowtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7701 static int nf_tables_newflowtable(struct sk_buff *skb,
7702 const struct nfnl_info *info,
7703 const struct nlattr * const nla[])
7704 {
7705 struct netlink_ext_ack *extack = info->extack;
7706 struct nft_flowtable_hook flowtable_hook;
7707 u8 genmask = nft_genmask_next(info->net);
7708 u8 family = info->nfmsg->nfgen_family;
7709 const struct nf_flowtable_type *type;
7710 struct nft_flowtable *flowtable;
7711 struct nft_hook *hook, *next;
7712 struct net *net = info->net;
7713 struct nft_table *table;
7714 struct nft_ctx ctx;
7715 int err;
7716
7717 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7718 !nla[NFTA_FLOWTABLE_NAME] ||
7719 !nla[NFTA_FLOWTABLE_HOOK])
7720 return -EINVAL;
7721
7722 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7723 genmask, NETLINK_CB(skb).portid);
7724 if (IS_ERR(table)) {
7725 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7726 return PTR_ERR(table);
7727 }
7728
7729 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7730 genmask);
7731 if (IS_ERR(flowtable)) {
7732 err = PTR_ERR(flowtable);
7733 if (err != -ENOENT) {
7734 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7735 return err;
7736 }
7737 } else {
7738 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7739 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7740 return -EEXIST;
7741 }
7742
7743 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7744
7745 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7746 }
7747
7748 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7749
7750 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
7751 if (!flowtable)
7752 return -ENOMEM;
7753
7754 flowtable->table = table;
7755 flowtable->handle = nf_tables_alloc_handle(table);
7756 INIT_LIST_HEAD(&flowtable->hook_list);
7757
7758 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
7759 if (!flowtable->name) {
7760 err = -ENOMEM;
7761 goto err1;
7762 }
7763
7764 type = nft_flowtable_type_get(net, family);
7765 if (IS_ERR(type)) {
7766 err = PTR_ERR(type);
7767 goto err2;
7768 }
7769
7770 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7771 flowtable->data.flags =
7772 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7773 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7774 err = -EOPNOTSUPP;
7775 goto err3;
7776 }
7777 }
7778
7779 write_pnet(&flowtable->data.net, net);
7780 flowtable->data.type = type;
7781 err = type->init(&flowtable->data);
7782 if (err < 0)
7783 goto err3;
7784
7785 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7786 &flowtable_hook, flowtable, true);
7787 if (err < 0)
7788 goto err4;
7789
7790 list_splice(&flowtable_hook.list, &flowtable->hook_list);
7791 flowtable->data.priority = flowtable_hook.priority;
7792 flowtable->hooknum = flowtable_hook.num;
7793
7794 err = nft_register_flowtable_net_hooks(ctx.net, table,
7795 &flowtable->hook_list,
7796 flowtable);
7797 if (err < 0) {
7798 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7799 goto err4;
7800 }
7801
7802 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7803 if (err < 0)
7804 goto err5;
7805
7806 list_add_tail_rcu(&flowtable->list, &table->flowtables);
7807 table->use++;
7808
7809 return 0;
7810 err5:
7811 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7812 nft_unregister_flowtable_hook(net, flowtable, hook);
7813 list_del_rcu(&hook->list);
7814 kfree_rcu(hook, rcu);
7815 }
7816 err4:
7817 flowtable->data.type->free(&flowtable->data);
7818 err3:
7819 module_put(type->owner);
7820 err2:
7821 kfree(flowtable->name);
7822 err1:
7823 kfree(flowtable);
7824 return err;
7825 }
7826
nft_flowtable_hook_release(struct nft_flowtable_hook * flowtable_hook)7827 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7828 {
7829 struct nft_hook *this, *next;
7830
7831 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7832 list_del(&this->list);
7833 kfree(this);
7834 }
7835 }
7836
nft_delflowtable_hook(struct nft_ctx * ctx,struct nft_flowtable * flowtable)7837 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7838 struct nft_flowtable *flowtable)
7839 {
7840 const struct nlattr * const *nla = ctx->nla;
7841 struct nft_flowtable_hook flowtable_hook;
7842 LIST_HEAD(flowtable_del_list);
7843 struct nft_hook *this, *hook;
7844 struct nft_trans *trans;
7845 int err;
7846
7847 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7848 &flowtable_hook, flowtable, false);
7849 if (err < 0)
7850 return err;
7851
7852 list_for_each_entry(this, &flowtable_hook.list, list) {
7853 hook = nft_hook_list_find(&flowtable->hook_list, this);
7854 if (!hook) {
7855 err = -ENOENT;
7856 goto err_flowtable_del_hook;
7857 }
7858 list_move(&hook->list, &flowtable_del_list);
7859 }
7860
7861 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7862 sizeof(struct nft_trans_flowtable));
7863 if (!trans) {
7864 err = -ENOMEM;
7865 goto err_flowtable_del_hook;
7866 }
7867
7868 nft_trans_flowtable(trans) = flowtable;
7869 nft_trans_flowtable_update(trans) = true;
7870 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7871 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
7872 nft_flowtable_hook_release(&flowtable_hook);
7873
7874 nft_trans_commit_list_add_tail(ctx->net, trans);
7875
7876 return 0;
7877
7878 err_flowtable_del_hook:
7879 list_splice(&flowtable_del_list, &flowtable->hook_list);
7880 nft_flowtable_hook_release(&flowtable_hook);
7881
7882 return err;
7883 }
7884
nf_tables_delflowtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7885 static int nf_tables_delflowtable(struct sk_buff *skb,
7886 const struct nfnl_info *info,
7887 const struct nlattr * const nla[])
7888 {
7889 struct netlink_ext_ack *extack = info->extack;
7890 u8 genmask = nft_genmask_next(info->net);
7891 u8 family = info->nfmsg->nfgen_family;
7892 struct nft_flowtable *flowtable;
7893 struct net *net = info->net;
7894 const struct nlattr *attr;
7895 struct nft_table *table;
7896 struct nft_ctx ctx;
7897
7898 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7899 (!nla[NFTA_FLOWTABLE_NAME] &&
7900 !nla[NFTA_FLOWTABLE_HANDLE]))
7901 return -EINVAL;
7902
7903 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7904 genmask, NETLINK_CB(skb).portid);
7905 if (IS_ERR(table)) {
7906 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7907 return PTR_ERR(table);
7908 }
7909
7910 if (nla[NFTA_FLOWTABLE_HANDLE]) {
7911 attr = nla[NFTA_FLOWTABLE_HANDLE];
7912 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7913 } else {
7914 attr = nla[NFTA_FLOWTABLE_NAME];
7915 flowtable = nft_flowtable_lookup(table, attr, genmask);
7916 }
7917
7918 if (IS_ERR(flowtable)) {
7919 NL_SET_BAD_ATTR(extack, attr);
7920 return PTR_ERR(flowtable);
7921 }
7922
7923 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7924
7925 if (nla[NFTA_FLOWTABLE_HOOK])
7926 return nft_delflowtable_hook(&ctx, flowtable);
7927
7928 if (flowtable->use > 0) {
7929 NL_SET_BAD_ATTR(extack, attr);
7930 return -EBUSY;
7931 }
7932
7933 return nft_delflowtable(&ctx, flowtable);
7934 }
7935
nf_tables_fill_flowtable_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,int event,u32 flags,int family,struct nft_flowtable * flowtable,struct list_head * hook_list)7936 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7937 u32 portid, u32 seq, int event,
7938 u32 flags, int family,
7939 struct nft_flowtable *flowtable,
7940 struct list_head *hook_list)
7941 {
7942 struct nlattr *nest, *nest_devs;
7943 struct nft_hook *hook;
7944 struct nlmsghdr *nlh;
7945
7946 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7947 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7948 NFNETLINK_V0, nft_base_seq(net));
7949 if (!nlh)
7950 goto nla_put_failure;
7951
7952 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7953 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7954 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7955 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7956 NFTA_FLOWTABLE_PAD) ||
7957 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7958 goto nla_put_failure;
7959
7960 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7961 if (!nest)
7962 goto nla_put_failure;
7963 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7964 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7965 goto nla_put_failure;
7966
7967 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7968 if (!nest_devs)
7969 goto nla_put_failure;
7970
7971 list_for_each_entry_rcu(hook, hook_list, list) {
7972 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7973 goto nla_put_failure;
7974 }
7975 nla_nest_end(skb, nest_devs);
7976 nla_nest_end(skb, nest);
7977
7978 nlmsg_end(skb, nlh);
7979 return 0;
7980
7981 nla_put_failure:
7982 nlmsg_trim(skb, nlh);
7983 return -1;
7984 }
7985
7986 struct nft_flowtable_filter {
7987 char *table;
7988 };
7989
nf_tables_dump_flowtable(struct sk_buff * skb,struct netlink_callback * cb)7990 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7991 struct netlink_callback *cb)
7992 {
7993 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7994 struct nft_flowtable_filter *filter = cb->data;
7995 unsigned int idx = 0, s_idx = cb->args[0];
7996 struct net *net = sock_net(skb->sk);
7997 int family = nfmsg->nfgen_family;
7998 struct nft_flowtable *flowtable;
7999 struct nftables_pernet *nft_net;
8000 const struct nft_table *table;
8001
8002 rcu_read_lock();
8003 nft_net = nft_pernet(net);
8004 cb->seq = READ_ONCE(nft_net->base_seq);
8005
8006 list_for_each_entry_rcu(table, &nft_net->tables, list) {
8007 if (family != NFPROTO_UNSPEC && family != table->family)
8008 continue;
8009
8010 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8011 if (!nft_is_active(net, flowtable))
8012 goto cont;
8013 if (idx < s_idx)
8014 goto cont;
8015 if (idx > s_idx)
8016 memset(&cb->args[1], 0,
8017 sizeof(cb->args) - sizeof(cb->args[0]));
8018 if (filter && filter->table &&
8019 strcmp(filter->table, table->name))
8020 goto cont;
8021
8022 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8023 cb->nlh->nlmsg_seq,
8024 NFT_MSG_NEWFLOWTABLE,
8025 NLM_F_MULTI | NLM_F_APPEND,
8026 table->family,
8027 flowtable,
8028 &flowtable->hook_list) < 0)
8029 goto done;
8030
8031 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8032 cont:
8033 idx++;
8034 }
8035 }
8036 done:
8037 rcu_read_unlock();
8038
8039 cb->args[0] = idx;
8040 return skb->len;
8041 }
8042
nf_tables_dump_flowtable_start(struct netlink_callback * cb)8043 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8044 {
8045 const struct nlattr * const *nla = cb->data;
8046 struct nft_flowtable_filter *filter = NULL;
8047
8048 if (nla[NFTA_FLOWTABLE_TABLE]) {
8049 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8050 if (!filter)
8051 return -ENOMEM;
8052
8053 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8054 GFP_ATOMIC);
8055 if (!filter->table) {
8056 kfree(filter);
8057 return -ENOMEM;
8058 }
8059 }
8060
8061 cb->data = filter;
8062 return 0;
8063 }
8064
nf_tables_dump_flowtable_done(struct netlink_callback * cb)8065 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8066 {
8067 struct nft_flowtable_filter *filter = cb->data;
8068
8069 if (!filter)
8070 return 0;
8071
8072 kfree(filter->table);
8073 kfree(filter);
8074
8075 return 0;
8076 }
8077
8078 /* called with rcu_read_lock held */
nf_tables_getflowtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8079 static int nf_tables_getflowtable(struct sk_buff *skb,
8080 const struct nfnl_info *info,
8081 const struct nlattr * const nla[])
8082 {
8083 u8 genmask = nft_genmask_cur(info->net);
8084 u8 family = info->nfmsg->nfgen_family;
8085 struct nft_flowtable *flowtable;
8086 const struct nft_table *table;
8087 struct net *net = info->net;
8088 struct sk_buff *skb2;
8089 int err;
8090
8091 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8092 struct netlink_dump_control c = {
8093 .start = nf_tables_dump_flowtable_start,
8094 .dump = nf_tables_dump_flowtable,
8095 .done = nf_tables_dump_flowtable_done,
8096 .module = THIS_MODULE,
8097 .data = (void *)nla,
8098 };
8099
8100 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8101 }
8102
8103 if (!nla[NFTA_FLOWTABLE_NAME])
8104 return -EINVAL;
8105
8106 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8107 genmask, 0);
8108 if (IS_ERR(table))
8109 return PTR_ERR(table);
8110
8111 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8112 genmask);
8113 if (IS_ERR(flowtable))
8114 return PTR_ERR(flowtable);
8115
8116 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8117 if (!skb2)
8118 return -ENOMEM;
8119
8120 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8121 info->nlh->nlmsg_seq,
8122 NFT_MSG_NEWFLOWTABLE, 0, family,
8123 flowtable, &flowtable->hook_list);
8124 if (err < 0)
8125 goto err_fill_flowtable_info;
8126
8127 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8128
8129 err_fill_flowtable_info:
8130 kfree_skb(skb2);
8131 return err;
8132 }
8133
nf_tables_flowtable_notify(struct nft_ctx * ctx,struct nft_flowtable * flowtable,struct list_head * hook_list,int event)8134 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8135 struct nft_flowtable *flowtable,
8136 struct list_head *hook_list,
8137 int event)
8138 {
8139 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8140 struct sk_buff *skb;
8141 u16 flags = 0;
8142 int err;
8143
8144 if (!ctx->report &&
8145 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8146 return;
8147
8148 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8149 if (skb == NULL)
8150 goto err;
8151
8152 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8153 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8154
8155 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8156 ctx->seq, event, flags,
8157 ctx->family, flowtable, hook_list);
8158 if (err < 0) {
8159 kfree_skb(skb);
8160 goto err;
8161 }
8162
8163 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8164 return;
8165 err:
8166 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8167 }
8168
nf_tables_flowtable_destroy(struct nft_flowtable * flowtable)8169 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8170 {
8171 struct nft_hook *hook, *next;
8172
8173 flowtable->data.type->free(&flowtable->data);
8174 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8175 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8176 FLOW_BLOCK_UNBIND);
8177 list_del_rcu(&hook->list);
8178 kfree(hook);
8179 }
8180 kfree(flowtable->name);
8181 module_put(flowtable->data.type->owner);
8182 kfree(flowtable);
8183 }
8184
nf_tables_fill_gen_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq)8185 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8186 u32 portid, u32 seq)
8187 {
8188 struct nftables_pernet *nft_net = nft_pernet(net);
8189 struct nlmsghdr *nlh;
8190 char buf[TASK_COMM_LEN];
8191 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8192
8193 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8194 NFNETLINK_V0, nft_base_seq(net));
8195 if (!nlh)
8196 goto nla_put_failure;
8197
8198 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8199 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8200 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8201 goto nla_put_failure;
8202
8203 nlmsg_end(skb, nlh);
8204 return 0;
8205
8206 nla_put_failure:
8207 nlmsg_trim(skb, nlh);
8208 return -EMSGSIZE;
8209 }
8210
nft_flowtable_event(unsigned long event,struct net_device * dev,struct nft_flowtable * flowtable)8211 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8212 struct nft_flowtable *flowtable)
8213 {
8214 struct nft_hook *hook;
8215
8216 list_for_each_entry(hook, &flowtable->hook_list, list) {
8217 if (hook->ops.dev != dev)
8218 continue;
8219
8220 /* flow_offload_netdev_event() cleans up entries for us. */
8221 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8222 list_del_rcu(&hook->list);
8223 kfree_rcu(hook, rcu);
8224 break;
8225 }
8226 }
8227
nf_tables_flowtable_event(struct notifier_block * this,unsigned long event,void * ptr)8228 static int nf_tables_flowtable_event(struct notifier_block *this,
8229 unsigned long event, void *ptr)
8230 {
8231 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8232 struct nft_flowtable *flowtable;
8233 struct nftables_pernet *nft_net;
8234 struct nft_table *table;
8235 struct net *net;
8236
8237 if (event != NETDEV_UNREGISTER)
8238 return 0;
8239
8240 net = dev_net(dev);
8241 nft_net = nft_pernet(net);
8242 mutex_lock(&nft_net->commit_mutex);
8243 list_for_each_entry(table, &nft_net->tables, list) {
8244 list_for_each_entry(flowtable, &table->flowtables, list) {
8245 nft_flowtable_event(event, dev, flowtable);
8246 }
8247 }
8248 mutex_unlock(&nft_net->commit_mutex);
8249
8250 return NOTIFY_DONE;
8251 }
8252
8253 static struct notifier_block nf_tables_flowtable_notifier = {
8254 .notifier_call = nf_tables_flowtable_event,
8255 };
8256
nf_tables_gen_notify(struct net * net,struct sk_buff * skb,int event)8257 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8258 int event)
8259 {
8260 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8261 struct sk_buff *skb2;
8262 int err;
8263
8264 if (!nlmsg_report(nlh) &&
8265 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8266 return;
8267
8268 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8269 if (skb2 == NULL)
8270 goto err;
8271
8272 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8273 nlh->nlmsg_seq);
8274 if (err < 0) {
8275 kfree_skb(skb2);
8276 goto err;
8277 }
8278
8279 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8280 nlmsg_report(nlh), GFP_KERNEL);
8281 return;
8282 err:
8283 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8284 -ENOBUFS);
8285 }
8286
nf_tables_getgen(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8287 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8288 const struct nlattr * const nla[])
8289 {
8290 struct sk_buff *skb2;
8291 int err;
8292
8293 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8294 if (skb2 == NULL)
8295 return -ENOMEM;
8296
8297 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8298 info->nlh->nlmsg_seq);
8299 if (err < 0)
8300 goto err_fill_gen_info;
8301
8302 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8303
8304 err_fill_gen_info:
8305 kfree_skb(skb2);
8306 return err;
8307 }
8308
8309 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8310 [NFT_MSG_NEWTABLE] = {
8311 .call = nf_tables_newtable,
8312 .type = NFNL_CB_BATCH,
8313 .attr_count = NFTA_TABLE_MAX,
8314 .policy = nft_table_policy,
8315 },
8316 [NFT_MSG_GETTABLE] = {
8317 .call = nf_tables_gettable,
8318 .type = NFNL_CB_RCU,
8319 .attr_count = NFTA_TABLE_MAX,
8320 .policy = nft_table_policy,
8321 },
8322 [NFT_MSG_DELTABLE] = {
8323 .call = nf_tables_deltable,
8324 .type = NFNL_CB_BATCH,
8325 .attr_count = NFTA_TABLE_MAX,
8326 .policy = nft_table_policy,
8327 },
8328 [NFT_MSG_NEWCHAIN] = {
8329 .call = nf_tables_newchain,
8330 .type = NFNL_CB_BATCH,
8331 .attr_count = NFTA_CHAIN_MAX,
8332 .policy = nft_chain_policy,
8333 },
8334 [NFT_MSG_GETCHAIN] = {
8335 .call = nf_tables_getchain,
8336 .type = NFNL_CB_RCU,
8337 .attr_count = NFTA_CHAIN_MAX,
8338 .policy = nft_chain_policy,
8339 },
8340 [NFT_MSG_DELCHAIN] = {
8341 .call = nf_tables_delchain,
8342 .type = NFNL_CB_BATCH,
8343 .attr_count = NFTA_CHAIN_MAX,
8344 .policy = nft_chain_policy,
8345 },
8346 [NFT_MSG_NEWRULE] = {
8347 .call = nf_tables_newrule,
8348 .type = NFNL_CB_BATCH,
8349 .attr_count = NFTA_RULE_MAX,
8350 .policy = nft_rule_policy,
8351 },
8352 [NFT_MSG_GETRULE] = {
8353 .call = nf_tables_getrule,
8354 .type = NFNL_CB_RCU,
8355 .attr_count = NFTA_RULE_MAX,
8356 .policy = nft_rule_policy,
8357 },
8358 [NFT_MSG_DELRULE] = {
8359 .call = nf_tables_delrule,
8360 .type = NFNL_CB_BATCH,
8361 .attr_count = NFTA_RULE_MAX,
8362 .policy = nft_rule_policy,
8363 },
8364 [NFT_MSG_NEWSET] = {
8365 .call = nf_tables_newset,
8366 .type = NFNL_CB_BATCH,
8367 .attr_count = NFTA_SET_MAX,
8368 .policy = nft_set_policy,
8369 },
8370 [NFT_MSG_GETSET] = {
8371 .call = nf_tables_getset,
8372 .type = NFNL_CB_RCU,
8373 .attr_count = NFTA_SET_MAX,
8374 .policy = nft_set_policy,
8375 },
8376 [NFT_MSG_DELSET] = {
8377 .call = nf_tables_delset,
8378 .type = NFNL_CB_BATCH,
8379 .attr_count = NFTA_SET_MAX,
8380 .policy = nft_set_policy,
8381 },
8382 [NFT_MSG_NEWSETELEM] = {
8383 .call = nf_tables_newsetelem,
8384 .type = NFNL_CB_BATCH,
8385 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8386 .policy = nft_set_elem_list_policy,
8387 },
8388 [NFT_MSG_GETSETELEM] = {
8389 .call = nf_tables_getsetelem,
8390 .type = NFNL_CB_RCU,
8391 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8392 .policy = nft_set_elem_list_policy,
8393 },
8394 [NFT_MSG_DELSETELEM] = {
8395 .call = nf_tables_delsetelem,
8396 .type = NFNL_CB_BATCH,
8397 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8398 .policy = nft_set_elem_list_policy,
8399 },
8400 [NFT_MSG_GETGEN] = {
8401 .call = nf_tables_getgen,
8402 .type = NFNL_CB_RCU,
8403 },
8404 [NFT_MSG_NEWOBJ] = {
8405 .call = nf_tables_newobj,
8406 .type = NFNL_CB_BATCH,
8407 .attr_count = NFTA_OBJ_MAX,
8408 .policy = nft_obj_policy,
8409 },
8410 [NFT_MSG_GETOBJ] = {
8411 .call = nf_tables_getobj,
8412 .type = NFNL_CB_RCU,
8413 .attr_count = NFTA_OBJ_MAX,
8414 .policy = nft_obj_policy,
8415 },
8416 [NFT_MSG_DELOBJ] = {
8417 .call = nf_tables_delobj,
8418 .type = NFNL_CB_BATCH,
8419 .attr_count = NFTA_OBJ_MAX,
8420 .policy = nft_obj_policy,
8421 },
8422 [NFT_MSG_GETOBJ_RESET] = {
8423 .call = nf_tables_getobj,
8424 .type = NFNL_CB_RCU,
8425 .attr_count = NFTA_OBJ_MAX,
8426 .policy = nft_obj_policy,
8427 },
8428 [NFT_MSG_NEWFLOWTABLE] = {
8429 .call = nf_tables_newflowtable,
8430 .type = NFNL_CB_BATCH,
8431 .attr_count = NFTA_FLOWTABLE_MAX,
8432 .policy = nft_flowtable_policy,
8433 },
8434 [NFT_MSG_GETFLOWTABLE] = {
8435 .call = nf_tables_getflowtable,
8436 .type = NFNL_CB_RCU,
8437 .attr_count = NFTA_FLOWTABLE_MAX,
8438 .policy = nft_flowtable_policy,
8439 },
8440 [NFT_MSG_DELFLOWTABLE] = {
8441 .call = nf_tables_delflowtable,
8442 .type = NFNL_CB_BATCH,
8443 .attr_count = NFTA_FLOWTABLE_MAX,
8444 .policy = nft_flowtable_policy,
8445 },
8446 };
8447
nf_tables_validate(struct net * net)8448 static int nf_tables_validate(struct net *net)
8449 {
8450 struct nftables_pernet *nft_net = nft_pernet(net);
8451 struct nft_table *table;
8452
8453 switch (nft_net->validate_state) {
8454 case NFT_VALIDATE_SKIP:
8455 break;
8456 case NFT_VALIDATE_NEED:
8457 nft_validate_state_update(net, NFT_VALIDATE_DO);
8458 fallthrough;
8459 case NFT_VALIDATE_DO:
8460 list_for_each_entry(table, &nft_net->tables, list) {
8461 if (nft_table_validate(net, table) < 0)
8462 return -EAGAIN;
8463 }
8464 break;
8465 }
8466
8467 return 0;
8468 }
8469
8470 /* a drop policy has to be deferred until all rules have been activated,
8471 * otherwise a large ruleset that contains a drop-policy base chain will
8472 * cause all packets to get dropped until the full transaction has been
8473 * processed.
8474 *
8475 * We defer the drop policy until the transaction has been finalized.
8476 */
nft_chain_commit_drop_policy(struct nft_trans * trans)8477 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8478 {
8479 struct nft_base_chain *basechain;
8480
8481 if (nft_trans_chain_policy(trans) != NF_DROP)
8482 return;
8483
8484 if (!nft_is_base_chain(trans->ctx.chain))
8485 return;
8486
8487 basechain = nft_base_chain(trans->ctx.chain);
8488 basechain->policy = NF_DROP;
8489 }
8490
nft_chain_commit_update(struct nft_trans * trans)8491 static void nft_chain_commit_update(struct nft_trans *trans)
8492 {
8493 struct nft_base_chain *basechain;
8494
8495 if (nft_trans_chain_name(trans)) {
8496 rhltable_remove(&trans->ctx.table->chains_ht,
8497 &trans->ctx.chain->rhlhead,
8498 nft_chain_ht_params);
8499 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8500 rhltable_insert_key(&trans->ctx.table->chains_ht,
8501 trans->ctx.chain->name,
8502 &trans->ctx.chain->rhlhead,
8503 nft_chain_ht_params);
8504 }
8505
8506 if (!nft_is_base_chain(trans->ctx.chain))
8507 return;
8508
8509 nft_chain_stats_replace(trans);
8510
8511 basechain = nft_base_chain(trans->ctx.chain);
8512
8513 switch (nft_trans_chain_policy(trans)) {
8514 case NF_DROP:
8515 case NF_ACCEPT:
8516 basechain->policy = nft_trans_chain_policy(trans);
8517 break;
8518 }
8519 }
8520
nft_obj_commit_update(struct nft_trans * trans)8521 static void nft_obj_commit_update(struct nft_trans *trans)
8522 {
8523 struct nft_object *newobj;
8524 struct nft_object *obj;
8525
8526 obj = nft_trans_obj(trans);
8527 newobj = nft_trans_obj_newobj(trans);
8528
8529 if (obj->ops->update)
8530 obj->ops->update(obj, newobj);
8531
8532 nft_obj_destroy(&trans->ctx, newobj);
8533 }
8534
nft_commit_release(struct nft_trans * trans)8535 static void nft_commit_release(struct nft_trans *trans)
8536 {
8537 switch (trans->msg_type) {
8538 case NFT_MSG_DELTABLE:
8539 nf_tables_table_destroy(&trans->ctx);
8540 break;
8541 case NFT_MSG_NEWCHAIN:
8542 free_percpu(nft_trans_chain_stats(trans));
8543 kfree(nft_trans_chain_name(trans));
8544 break;
8545 case NFT_MSG_DELCHAIN:
8546 nf_tables_chain_destroy(&trans->ctx);
8547 break;
8548 case NFT_MSG_DELRULE:
8549 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8550 break;
8551 case NFT_MSG_DELSET:
8552 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8553 break;
8554 case NFT_MSG_DELSETELEM:
8555 nf_tables_set_elem_destroy(&trans->ctx,
8556 nft_trans_elem_set(trans),
8557 nft_trans_elem(trans).priv);
8558 break;
8559 case NFT_MSG_DELOBJ:
8560 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8561 break;
8562 case NFT_MSG_DELFLOWTABLE:
8563 if (nft_trans_flowtable_update(trans))
8564 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8565 else
8566 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8567 break;
8568 }
8569
8570 if (trans->put_net)
8571 put_net(trans->ctx.net);
8572
8573 kfree(trans);
8574 }
8575
nf_tables_trans_destroy_work(struct work_struct * w)8576 static void nf_tables_trans_destroy_work(struct work_struct *w)
8577 {
8578 struct nft_trans *trans, *next;
8579 LIST_HEAD(head);
8580
8581 spin_lock(&nf_tables_destroy_list_lock);
8582 list_splice_init(&nf_tables_destroy_list, &head);
8583 spin_unlock(&nf_tables_destroy_list_lock);
8584
8585 if (list_empty(&head))
8586 return;
8587
8588 synchronize_rcu();
8589
8590 list_for_each_entry_safe(trans, next, &head, list) {
8591 list_del(&trans->list);
8592 nft_commit_release(trans);
8593 }
8594 }
8595
nf_tables_trans_destroy_flush_work(void)8596 void nf_tables_trans_destroy_flush_work(void)
8597 {
8598 flush_work(&trans_destroy_work);
8599 }
8600 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8601
nft_expr_reduce(struct nft_regs_track * track,const struct nft_expr * expr)8602 static bool nft_expr_reduce(struct nft_regs_track *track,
8603 const struct nft_expr *expr)
8604 {
8605 return false;
8606 }
8607
nf_tables_commit_chain_prepare(struct net * net,struct nft_chain * chain)8608 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8609 {
8610 const struct nft_expr *expr, *last;
8611 struct nft_regs_track track = {};
8612 unsigned int size, data_size;
8613 void *data, *data_boundary;
8614 struct nft_rule_dp *prule;
8615 struct nft_rule *rule;
8616
8617 /* already handled or inactive chain? */
8618 if (chain->blob_next || !nft_is_active_next(net, chain))
8619 return 0;
8620
8621 data_size = 0;
8622 list_for_each_entry(rule, &chain->rules, list) {
8623 if (nft_is_active_next(net, rule)) {
8624 data_size += sizeof(*prule) + rule->dlen;
8625 if (data_size > INT_MAX)
8626 return -ENOMEM;
8627 }
8628 }
8629 data_size += offsetof(struct nft_rule_dp, data); /* last rule */
8630
8631 chain->blob_next = nf_tables_chain_alloc_rules(data_size);
8632 if (!chain->blob_next)
8633 return -ENOMEM;
8634
8635 data = (void *)chain->blob_next->data;
8636 data_boundary = data + data_size;
8637 size = 0;
8638
8639 list_for_each_entry(rule, &chain->rules, list) {
8640 if (!nft_is_active_next(net, rule))
8641 continue;
8642
8643 prule = (struct nft_rule_dp *)data;
8644 data += offsetof(struct nft_rule_dp, data);
8645 if (WARN_ON_ONCE(data > data_boundary))
8646 return -ENOMEM;
8647
8648 size = 0;
8649 track.last = nft_expr_last(rule);
8650 nft_rule_for_each_expr(expr, last, rule) {
8651 track.cur = expr;
8652
8653 if (nft_expr_reduce(&track, expr)) {
8654 expr = track.cur;
8655 continue;
8656 }
8657
8658 if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8659 return -ENOMEM;
8660
8661 memcpy(data + size, expr, expr->ops->size);
8662 size += expr->ops->size;
8663 }
8664 if (WARN_ON_ONCE(size >= 1 << 12))
8665 return -ENOMEM;
8666
8667 prule->handle = rule->handle;
8668 prule->dlen = size;
8669 prule->is_last = 0;
8670
8671 data += size;
8672 size = 0;
8673 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8674 }
8675
8676 prule = (struct nft_rule_dp *)data;
8677 data += offsetof(struct nft_rule_dp, data);
8678 if (WARN_ON_ONCE(data > data_boundary))
8679 return -ENOMEM;
8680
8681 nft_last_rule(chain->blob_next, prule);
8682
8683 return 0;
8684 }
8685
nf_tables_commit_chain_prepare_cancel(struct net * net)8686 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8687 {
8688 struct nftables_pernet *nft_net = nft_pernet(net);
8689 struct nft_trans *trans, *next;
8690
8691 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8692 struct nft_chain *chain = trans->ctx.chain;
8693
8694 if (trans->msg_type == NFT_MSG_NEWRULE ||
8695 trans->msg_type == NFT_MSG_DELRULE) {
8696 kvfree(chain->blob_next);
8697 chain->blob_next = NULL;
8698 }
8699 }
8700 }
8701
__nf_tables_commit_chain_free_rules_old(struct rcu_head * h)8702 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8703 {
8704 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8705
8706 kvfree(o->blob);
8707 }
8708
nf_tables_commit_chain_free_rules_old(struct nft_rule_blob * blob)8709 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8710 {
8711 struct nft_rules_old *old;
8712
8713 /* rcu_head is after end marker */
8714 old = (void *)blob + sizeof(*blob) + blob->size;
8715 old->blob = blob;
8716
8717 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8718 }
8719
nf_tables_commit_chain(struct net * net,struct nft_chain * chain)8720 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8721 {
8722 struct nft_rule_blob *g0, *g1;
8723 bool next_genbit;
8724
8725 next_genbit = nft_gencursor_next(net);
8726
8727 g0 = rcu_dereference_protected(chain->blob_gen_0,
8728 lockdep_commit_lock_is_held(net));
8729 g1 = rcu_dereference_protected(chain->blob_gen_1,
8730 lockdep_commit_lock_is_held(net));
8731
8732 /* No changes to this chain? */
8733 if (chain->blob_next == NULL) {
8734 /* chain had no change in last or next generation */
8735 if (g0 == g1)
8736 return;
8737 /*
8738 * chain had no change in this generation; make sure next
8739 * one uses same rules as current generation.
8740 */
8741 if (next_genbit) {
8742 rcu_assign_pointer(chain->blob_gen_1, g0);
8743 nf_tables_commit_chain_free_rules_old(g1);
8744 } else {
8745 rcu_assign_pointer(chain->blob_gen_0, g1);
8746 nf_tables_commit_chain_free_rules_old(g0);
8747 }
8748
8749 return;
8750 }
8751
8752 if (next_genbit)
8753 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
8754 else
8755 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
8756
8757 chain->blob_next = NULL;
8758
8759 if (g0 == g1)
8760 return;
8761
8762 if (next_genbit)
8763 nf_tables_commit_chain_free_rules_old(g1);
8764 else
8765 nf_tables_commit_chain_free_rules_old(g0);
8766 }
8767
nft_obj_del(struct nft_object * obj)8768 static void nft_obj_del(struct nft_object *obj)
8769 {
8770 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8771 list_del_rcu(&obj->list);
8772 }
8773
nft_chain_del(struct nft_chain * chain)8774 void nft_chain_del(struct nft_chain *chain)
8775 {
8776 struct nft_table *table = chain->table;
8777
8778 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8779 nft_chain_ht_params));
8780 list_del_rcu(&chain->list);
8781 }
8782
nf_tables_module_autoload_cleanup(struct net * net)8783 static void nf_tables_module_autoload_cleanup(struct net *net)
8784 {
8785 struct nftables_pernet *nft_net = nft_pernet(net);
8786 struct nft_module_request *req, *next;
8787
8788 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8789 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8790 WARN_ON_ONCE(!req->done);
8791 list_del(&req->list);
8792 kfree(req);
8793 }
8794 }
8795
nf_tables_commit_release(struct net * net)8796 static void nf_tables_commit_release(struct net *net)
8797 {
8798 struct nftables_pernet *nft_net = nft_pernet(net);
8799 struct nft_trans *trans;
8800
8801 /* all side effects have to be made visible.
8802 * For example, if a chain named 'foo' has been deleted, a
8803 * new transaction must not find it anymore.
8804 *
8805 * Memory reclaim happens asynchronously from work queue
8806 * to prevent expensive synchronize_rcu() in commit phase.
8807 */
8808 if (list_empty(&nft_net->commit_list)) {
8809 nf_tables_module_autoload_cleanup(net);
8810 mutex_unlock(&nft_net->commit_mutex);
8811 return;
8812 }
8813
8814 trans = list_last_entry(&nft_net->commit_list,
8815 struct nft_trans, list);
8816 get_net(trans->ctx.net);
8817 WARN_ON_ONCE(trans->put_net);
8818
8819 trans->put_net = true;
8820 spin_lock(&nf_tables_destroy_list_lock);
8821 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8822 spin_unlock(&nf_tables_destroy_list_lock);
8823
8824 nf_tables_module_autoload_cleanup(net);
8825 schedule_work(&trans_destroy_work);
8826
8827 mutex_unlock(&nft_net->commit_mutex);
8828 }
8829
nft_commit_notify(struct net * net,u32 portid)8830 static void nft_commit_notify(struct net *net, u32 portid)
8831 {
8832 struct nftables_pernet *nft_net = nft_pernet(net);
8833 struct sk_buff *batch_skb = NULL, *nskb, *skb;
8834 unsigned char *data;
8835 int len;
8836
8837 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8838 if (!batch_skb) {
8839 new_batch:
8840 batch_skb = skb;
8841 len = NLMSG_GOODSIZE - skb->len;
8842 list_del(&skb->list);
8843 continue;
8844 }
8845 len -= skb->len;
8846 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8847 data = skb_put(batch_skb, skb->len);
8848 memcpy(data, skb->data, skb->len);
8849 list_del(&skb->list);
8850 kfree_skb(skb);
8851 continue;
8852 }
8853 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8854 NFT_CB(batch_skb).report, GFP_KERNEL);
8855 goto new_batch;
8856 }
8857
8858 if (batch_skb) {
8859 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8860 NFT_CB(batch_skb).report, GFP_KERNEL);
8861 }
8862
8863 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8864 }
8865
nf_tables_commit_audit_alloc(struct list_head * adl,struct nft_table * table)8866 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8867 struct nft_table *table)
8868 {
8869 struct nft_audit_data *adp;
8870
8871 list_for_each_entry(adp, adl, list) {
8872 if (adp->table == table)
8873 return 0;
8874 }
8875 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8876 if (!adp)
8877 return -ENOMEM;
8878 adp->table = table;
8879 list_add(&adp->list, adl);
8880 return 0;
8881 }
8882
nf_tables_commit_audit_free(struct list_head * adl)8883 static void nf_tables_commit_audit_free(struct list_head *adl)
8884 {
8885 struct nft_audit_data *adp, *adn;
8886
8887 list_for_each_entry_safe(adp, adn, adl, list) {
8888 list_del(&adp->list);
8889 kfree(adp);
8890 }
8891 }
8892
nf_tables_commit_audit_collect(struct list_head * adl,struct nft_table * table,u32 op)8893 static void nf_tables_commit_audit_collect(struct list_head *adl,
8894 struct nft_table *table, u32 op)
8895 {
8896 struct nft_audit_data *adp;
8897
8898 list_for_each_entry(adp, adl, list) {
8899 if (adp->table == table)
8900 goto found;
8901 }
8902 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8903 return;
8904 found:
8905 adp->entries++;
8906 if (!adp->op || adp->op > op)
8907 adp->op = op;
8908 }
8909
8910 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8911
nf_tables_commit_audit_log(struct list_head * adl,u32 generation)8912 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8913 {
8914 struct nft_audit_data *adp, *adn;
8915 char aubuf[AUNFTABLENAMELEN];
8916
8917 list_for_each_entry_safe(adp, adn, adl, list) {
8918 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8919 generation);
8920 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8921 nft2audit_op[adp->op], GFP_KERNEL);
8922 list_del(&adp->list);
8923 kfree(adp);
8924 }
8925 }
8926
nf_tables_commit(struct net * net,struct sk_buff * skb)8927 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8928 {
8929 struct nftables_pernet *nft_net = nft_pernet(net);
8930 struct nft_trans *trans, *next;
8931 struct nft_trans_elem *te;
8932 struct nft_chain *chain;
8933 struct nft_table *table;
8934 unsigned int base_seq;
8935 LIST_HEAD(adl);
8936 int err;
8937
8938 if (list_empty(&nft_net->commit_list)) {
8939 mutex_unlock(&nft_net->commit_mutex);
8940 return 0;
8941 }
8942
8943 /* 0. Validate ruleset, otherwise roll back for error reporting. */
8944 if (nf_tables_validate(net) < 0)
8945 return -EAGAIN;
8946
8947 err = nft_flow_rule_offload_commit(net);
8948 if (err < 0)
8949 return err;
8950
8951 /* 1. Allocate space for next generation rules_gen_X[] */
8952 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8953 int ret;
8954
8955 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8956 if (ret) {
8957 nf_tables_commit_chain_prepare_cancel(net);
8958 nf_tables_commit_audit_free(&adl);
8959 return ret;
8960 }
8961 if (trans->msg_type == NFT_MSG_NEWRULE ||
8962 trans->msg_type == NFT_MSG_DELRULE) {
8963 chain = trans->ctx.chain;
8964
8965 ret = nf_tables_commit_chain_prepare(net, chain);
8966 if (ret < 0) {
8967 nf_tables_commit_chain_prepare_cancel(net);
8968 nf_tables_commit_audit_free(&adl);
8969 return ret;
8970 }
8971 }
8972 }
8973
8974 /* step 2. Make rules_gen_X visible to packet path */
8975 list_for_each_entry(table, &nft_net->tables, list) {
8976 list_for_each_entry(chain, &table->chains, list)
8977 nf_tables_commit_chain(net, chain);
8978 }
8979
8980 /*
8981 * Bump generation counter, invalidate any dump in progress.
8982 * Cannot fail after this point.
8983 */
8984 base_seq = READ_ONCE(nft_net->base_seq);
8985 while (++base_seq == 0)
8986 ;
8987
8988 WRITE_ONCE(nft_net->base_seq, base_seq);
8989
8990 /* step 3. Start new generation, rules_gen_X now in use. */
8991 net->nft.gencursor = nft_gencursor_next(net);
8992
8993 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8994 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8995 trans->msg_type);
8996 switch (trans->msg_type) {
8997 case NFT_MSG_NEWTABLE:
8998 if (nft_trans_table_update(trans)) {
8999 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9000 nft_trans_destroy(trans);
9001 break;
9002 }
9003 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9004 nf_tables_table_disable(net, trans->ctx.table);
9005
9006 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9007 } else {
9008 nft_clear(net, trans->ctx.table);
9009 }
9010 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9011 nft_trans_destroy(trans);
9012 break;
9013 case NFT_MSG_DELTABLE:
9014 list_del_rcu(&trans->ctx.table->list);
9015 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
9016 break;
9017 case NFT_MSG_NEWCHAIN:
9018 if (nft_trans_chain_update(trans)) {
9019 nft_chain_commit_update(trans);
9020 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9021 /* trans destroyed after rcu grace period */
9022 } else {
9023 nft_chain_commit_drop_policy(trans);
9024 nft_clear(net, trans->ctx.chain);
9025 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9026 nft_trans_destroy(trans);
9027 }
9028 break;
9029 case NFT_MSG_DELCHAIN:
9030 nft_chain_del(trans->ctx.chain);
9031 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
9032 nf_tables_unregister_hook(trans->ctx.net,
9033 trans->ctx.table,
9034 trans->ctx.chain);
9035 break;
9036 case NFT_MSG_NEWRULE:
9037 nft_clear(trans->ctx.net, nft_trans_rule(trans));
9038 nf_tables_rule_notify(&trans->ctx,
9039 nft_trans_rule(trans),
9040 NFT_MSG_NEWRULE);
9041 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9042 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9043
9044 nft_trans_destroy(trans);
9045 break;
9046 case NFT_MSG_DELRULE:
9047 list_del_rcu(&nft_trans_rule(trans)->list);
9048 nf_tables_rule_notify(&trans->ctx,
9049 nft_trans_rule(trans),
9050 NFT_MSG_DELRULE);
9051 nft_rule_expr_deactivate(&trans->ctx,
9052 nft_trans_rule(trans),
9053 NFT_TRANS_COMMIT);
9054
9055 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9056 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9057 break;
9058 case NFT_MSG_NEWSET:
9059 if (nft_trans_set_update(trans)) {
9060 struct nft_set *set = nft_trans_set(trans);
9061
9062 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9063 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9064 } else {
9065 nft_clear(net, nft_trans_set(trans));
9066 /* This avoids hitting -EBUSY when deleting the table
9067 * from the transaction.
9068 */
9069 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9070 !list_empty(&nft_trans_set(trans)->bindings))
9071 trans->ctx.table->use--;
9072 }
9073 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9074 NFT_MSG_NEWSET, GFP_KERNEL);
9075 nft_trans_destroy(trans);
9076 break;
9077 case NFT_MSG_DELSET:
9078 list_del_rcu(&nft_trans_set(trans)->list);
9079 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9080 NFT_MSG_DELSET, GFP_KERNEL);
9081 break;
9082 case NFT_MSG_NEWSETELEM:
9083 te = (struct nft_trans_elem *)trans->data;
9084
9085 nft_setelem_activate(net, te->set, &te->elem);
9086 nf_tables_setelem_notify(&trans->ctx, te->set,
9087 &te->elem,
9088 NFT_MSG_NEWSETELEM);
9089 nft_trans_destroy(trans);
9090 break;
9091 case NFT_MSG_DELSETELEM:
9092 te = (struct nft_trans_elem *)trans->data;
9093
9094 nf_tables_setelem_notify(&trans->ctx, te->set,
9095 &te->elem,
9096 NFT_MSG_DELSETELEM);
9097 nft_setelem_remove(net, te->set, &te->elem);
9098 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9099 atomic_dec(&te->set->nelems);
9100 te->set->ndeact--;
9101 }
9102 break;
9103 case NFT_MSG_NEWOBJ:
9104 if (nft_trans_obj_update(trans)) {
9105 nft_obj_commit_update(trans);
9106 nf_tables_obj_notify(&trans->ctx,
9107 nft_trans_obj(trans),
9108 NFT_MSG_NEWOBJ);
9109 } else {
9110 nft_clear(net, nft_trans_obj(trans));
9111 nf_tables_obj_notify(&trans->ctx,
9112 nft_trans_obj(trans),
9113 NFT_MSG_NEWOBJ);
9114 nft_trans_destroy(trans);
9115 }
9116 break;
9117 case NFT_MSG_DELOBJ:
9118 nft_obj_del(nft_trans_obj(trans));
9119 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9120 NFT_MSG_DELOBJ);
9121 break;
9122 case NFT_MSG_NEWFLOWTABLE:
9123 if (nft_trans_flowtable_update(trans)) {
9124 nft_trans_flowtable(trans)->data.flags =
9125 nft_trans_flowtable_flags(trans);
9126 nf_tables_flowtable_notify(&trans->ctx,
9127 nft_trans_flowtable(trans),
9128 &nft_trans_flowtable_hooks(trans),
9129 NFT_MSG_NEWFLOWTABLE);
9130 list_splice(&nft_trans_flowtable_hooks(trans),
9131 &nft_trans_flowtable(trans)->hook_list);
9132 } else {
9133 nft_clear(net, nft_trans_flowtable(trans));
9134 nf_tables_flowtable_notify(&trans->ctx,
9135 nft_trans_flowtable(trans),
9136 &nft_trans_flowtable(trans)->hook_list,
9137 NFT_MSG_NEWFLOWTABLE);
9138 }
9139 nft_trans_destroy(trans);
9140 break;
9141 case NFT_MSG_DELFLOWTABLE:
9142 if (nft_trans_flowtable_update(trans)) {
9143 nf_tables_flowtable_notify(&trans->ctx,
9144 nft_trans_flowtable(trans),
9145 &nft_trans_flowtable_hooks(trans),
9146 NFT_MSG_DELFLOWTABLE);
9147 nft_unregister_flowtable_net_hooks(net,
9148 &nft_trans_flowtable_hooks(trans));
9149 } else {
9150 list_del_rcu(&nft_trans_flowtable(trans)->list);
9151 nf_tables_flowtable_notify(&trans->ctx,
9152 nft_trans_flowtable(trans),
9153 &nft_trans_flowtable(trans)->hook_list,
9154 NFT_MSG_DELFLOWTABLE);
9155 nft_unregister_flowtable_net_hooks(net,
9156 &nft_trans_flowtable(trans)->hook_list);
9157 }
9158 break;
9159 }
9160 }
9161
9162 nft_commit_notify(net, NETLINK_CB(skb).portid);
9163 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9164 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9165 nf_tables_commit_release(net);
9166
9167 return 0;
9168 }
9169
nf_tables_module_autoload(struct net * net)9170 static void nf_tables_module_autoload(struct net *net)
9171 {
9172 struct nftables_pernet *nft_net = nft_pernet(net);
9173 struct nft_module_request *req, *next;
9174 LIST_HEAD(module_list);
9175
9176 list_splice_init(&nft_net->module_list, &module_list);
9177 mutex_unlock(&nft_net->commit_mutex);
9178 list_for_each_entry_safe(req, next, &module_list, list) {
9179 request_module("%s", req->module);
9180 req->done = true;
9181 }
9182 mutex_lock(&nft_net->commit_mutex);
9183 list_splice(&module_list, &nft_net->module_list);
9184 }
9185
nf_tables_abort_release(struct nft_trans * trans)9186 static void nf_tables_abort_release(struct nft_trans *trans)
9187 {
9188 switch (trans->msg_type) {
9189 case NFT_MSG_NEWTABLE:
9190 nf_tables_table_destroy(&trans->ctx);
9191 break;
9192 case NFT_MSG_NEWCHAIN:
9193 nf_tables_chain_destroy(&trans->ctx);
9194 break;
9195 case NFT_MSG_NEWRULE:
9196 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9197 break;
9198 case NFT_MSG_NEWSET:
9199 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9200 break;
9201 case NFT_MSG_NEWSETELEM:
9202 nft_set_elem_destroy(nft_trans_elem_set(trans),
9203 nft_trans_elem(trans).priv, true);
9204 break;
9205 case NFT_MSG_NEWOBJ:
9206 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9207 break;
9208 case NFT_MSG_NEWFLOWTABLE:
9209 if (nft_trans_flowtable_update(trans))
9210 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9211 else
9212 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9213 break;
9214 }
9215 kfree(trans);
9216 }
9217
__nf_tables_abort(struct net * net,enum nfnl_abort_action action)9218 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9219 {
9220 struct nftables_pernet *nft_net = nft_pernet(net);
9221 struct nft_trans *trans, *next;
9222 struct nft_trans_elem *te;
9223
9224 if (action == NFNL_ABORT_VALIDATE &&
9225 nf_tables_validate(net) < 0)
9226 return -EAGAIN;
9227
9228 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9229 list) {
9230 switch (trans->msg_type) {
9231 case NFT_MSG_NEWTABLE:
9232 if (nft_trans_table_update(trans)) {
9233 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9234 nft_trans_destroy(trans);
9235 break;
9236 }
9237 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9238 nf_tables_table_disable(net, trans->ctx.table);
9239 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9240 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9241 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9242 }
9243 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9244 nft_trans_destroy(trans);
9245 } else {
9246 list_del_rcu(&trans->ctx.table->list);
9247 }
9248 break;
9249 case NFT_MSG_DELTABLE:
9250 nft_clear(trans->ctx.net, trans->ctx.table);
9251 nft_trans_destroy(trans);
9252 break;
9253 case NFT_MSG_NEWCHAIN:
9254 if (nft_trans_chain_update(trans)) {
9255 free_percpu(nft_trans_chain_stats(trans));
9256 kfree(nft_trans_chain_name(trans));
9257 nft_trans_destroy(trans);
9258 } else {
9259 if (nft_chain_is_bound(trans->ctx.chain)) {
9260 nft_trans_destroy(trans);
9261 break;
9262 }
9263 trans->ctx.table->use--;
9264 nft_chain_del(trans->ctx.chain);
9265 nf_tables_unregister_hook(trans->ctx.net,
9266 trans->ctx.table,
9267 trans->ctx.chain);
9268 }
9269 break;
9270 case NFT_MSG_DELCHAIN:
9271 trans->ctx.table->use++;
9272 nft_clear(trans->ctx.net, trans->ctx.chain);
9273 nft_trans_destroy(trans);
9274 break;
9275 case NFT_MSG_NEWRULE:
9276 trans->ctx.chain->use--;
9277 list_del_rcu(&nft_trans_rule(trans)->list);
9278 nft_rule_expr_deactivate(&trans->ctx,
9279 nft_trans_rule(trans),
9280 NFT_TRANS_ABORT);
9281 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9282 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9283 break;
9284 case NFT_MSG_DELRULE:
9285 trans->ctx.chain->use++;
9286 nft_clear(trans->ctx.net, nft_trans_rule(trans));
9287 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9288 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9289 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9290
9291 nft_trans_destroy(trans);
9292 break;
9293 case NFT_MSG_NEWSET:
9294 if (nft_trans_set_update(trans)) {
9295 nft_trans_destroy(trans);
9296 break;
9297 }
9298 trans->ctx.table->use--;
9299 if (nft_trans_set_bound(trans)) {
9300 nft_trans_destroy(trans);
9301 break;
9302 }
9303 list_del_rcu(&nft_trans_set(trans)->list);
9304 break;
9305 case NFT_MSG_DELSET:
9306 trans->ctx.table->use++;
9307 nft_clear(trans->ctx.net, nft_trans_set(trans));
9308 nft_trans_destroy(trans);
9309 break;
9310 case NFT_MSG_NEWSETELEM:
9311 if (nft_trans_elem_set_bound(trans)) {
9312 nft_trans_destroy(trans);
9313 break;
9314 }
9315 te = (struct nft_trans_elem *)trans->data;
9316 nft_setelem_remove(net, te->set, &te->elem);
9317 if (!nft_setelem_is_catchall(te->set, &te->elem))
9318 atomic_dec(&te->set->nelems);
9319 break;
9320 case NFT_MSG_DELSETELEM:
9321 te = (struct nft_trans_elem *)trans->data;
9322
9323 nft_setelem_data_activate(net, te->set, &te->elem);
9324 nft_setelem_activate(net, te->set, &te->elem);
9325 if (!nft_setelem_is_catchall(te->set, &te->elem))
9326 te->set->ndeact--;
9327
9328 nft_trans_destroy(trans);
9329 break;
9330 case NFT_MSG_NEWOBJ:
9331 if (nft_trans_obj_update(trans)) {
9332 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9333 nft_trans_destroy(trans);
9334 } else {
9335 trans->ctx.table->use--;
9336 nft_obj_del(nft_trans_obj(trans));
9337 }
9338 break;
9339 case NFT_MSG_DELOBJ:
9340 trans->ctx.table->use++;
9341 nft_clear(trans->ctx.net, nft_trans_obj(trans));
9342 nft_trans_destroy(trans);
9343 break;
9344 case NFT_MSG_NEWFLOWTABLE:
9345 if (nft_trans_flowtable_update(trans)) {
9346 nft_unregister_flowtable_net_hooks(net,
9347 &nft_trans_flowtable_hooks(trans));
9348 } else {
9349 trans->ctx.table->use--;
9350 list_del_rcu(&nft_trans_flowtable(trans)->list);
9351 nft_unregister_flowtable_net_hooks(net,
9352 &nft_trans_flowtable(trans)->hook_list);
9353 }
9354 break;
9355 case NFT_MSG_DELFLOWTABLE:
9356 if (nft_trans_flowtable_update(trans)) {
9357 list_splice(&nft_trans_flowtable_hooks(trans),
9358 &nft_trans_flowtable(trans)->hook_list);
9359 } else {
9360 trans->ctx.table->use++;
9361 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9362 }
9363 nft_trans_destroy(trans);
9364 break;
9365 }
9366 }
9367
9368 synchronize_rcu();
9369
9370 list_for_each_entry_safe_reverse(trans, next,
9371 &nft_net->commit_list, list) {
9372 list_del(&trans->list);
9373 nf_tables_abort_release(trans);
9374 }
9375
9376 if (action == NFNL_ABORT_AUTOLOAD)
9377 nf_tables_module_autoload(net);
9378 else
9379 nf_tables_module_autoload_cleanup(net);
9380
9381 return 0;
9382 }
9383
nf_tables_cleanup(struct net * net)9384 static void nf_tables_cleanup(struct net *net)
9385 {
9386 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9387 }
9388
nf_tables_abort(struct net * net,struct sk_buff * skb,enum nfnl_abort_action action)9389 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9390 enum nfnl_abort_action action)
9391 {
9392 struct nftables_pernet *nft_net = nft_pernet(net);
9393 int ret = __nf_tables_abort(net, action);
9394
9395 mutex_unlock(&nft_net->commit_mutex);
9396
9397 return ret;
9398 }
9399
nf_tables_valid_genid(struct net * net,u32 genid)9400 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9401 {
9402 struct nftables_pernet *nft_net = nft_pernet(net);
9403 bool genid_ok;
9404
9405 mutex_lock(&nft_net->commit_mutex);
9406
9407 genid_ok = genid == 0 || nft_net->base_seq == genid;
9408 if (!genid_ok)
9409 mutex_unlock(&nft_net->commit_mutex);
9410
9411 /* else, commit mutex has to be released by commit or abort function */
9412 return genid_ok;
9413 }
9414
9415 static const struct nfnetlink_subsystem nf_tables_subsys = {
9416 .name = "nf_tables",
9417 .subsys_id = NFNL_SUBSYS_NFTABLES,
9418 .cb_count = NFT_MSG_MAX,
9419 .cb = nf_tables_cb,
9420 .commit = nf_tables_commit,
9421 .abort = nf_tables_abort,
9422 .cleanup = nf_tables_cleanup,
9423 .valid_genid = nf_tables_valid_genid,
9424 .owner = THIS_MODULE,
9425 };
9426
nft_chain_validate_dependency(const struct nft_chain * chain,enum nft_chain_types type)9427 int nft_chain_validate_dependency(const struct nft_chain *chain,
9428 enum nft_chain_types type)
9429 {
9430 const struct nft_base_chain *basechain;
9431
9432 if (nft_is_base_chain(chain)) {
9433 basechain = nft_base_chain(chain);
9434 if (basechain->type->type != type)
9435 return -EOPNOTSUPP;
9436 }
9437 return 0;
9438 }
9439 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9440
nft_chain_validate_hooks(const struct nft_chain * chain,unsigned int hook_flags)9441 int nft_chain_validate_hooks(const struct nft_chain *chain,
9442 unsigned int hook_flags)
9443 {
9444 struct nft_base_chain *basechain;
9445
9446 if (nft_is_base_chain(chain)) {
9447 basechain = nft_base_chain(chain);
9448
9449 if ((1 << basechain->ops.hooknum) & hook_flags)
9450 return 0;
9451
9452 return -EOPNOTSUPP;
9453 }
9454
9455 return 0;
9456 }
9457 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9458
9459 /*
9460 * Loop detection - walk through the ruleset beginning at the destination chain
9461 * of a new jump until either the source chain is reached (loop) or all
9462 * reachable chains have been traversed.
9463 *
9464 * The loop check is performed whenever a new jump verdict is added to an
9465 * expression or verdict map or a verdict map is bound to a new chain.
9466 */
9467
9468 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9469 const struct nft_chain *chain);
9470
nft_check_loops(const struct nft_ctx * ctx,const struct nft_set_ext * ext)9471 static int nft_check_loops(const struct nft_ctx *ctx,
9472 const struct nft_set_ext *ext)
9473 {
9474 const struct nft_data *data;
9475 int ret;
9476
9477 data = nft_set_ext_data(ext);
9478 switch (data->verdict.code) {
9479 case NFT_JUMP:
9480 case NFT_GOTO:
9481 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9482 break;
9483 default:
9484 ret = 0;
9485 break;
9486 }
9487
9488 return ret;
9489 }
9490
nf_tables_loop_check_setelem(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)9491 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9492 struct nft_set *set,
9493 const struct nft_set_iter *iter,
9494 struct nft_set_elem *elem)
9495 {
9496 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9497
9498 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9499 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9500 return 0;
9501
9502 return nft_check_loops(ctx, ext);
9503 }
9504
nft_set_catchall_loops(const struct nft_ctx * ctx,struct nft_set * set)9505 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9506 struct nft_set *set)
9507 {
9508 u8 genmask = nft_genmask_next(ctx->net);
9509 struct nft_set_elem_catchall *catchall;
9510 struct nft_set_ext *ext;
9511 int ret = 0;
9512
9513 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9514 ext = nft_set_elem_ext(set, catchall->elem);
9515 if (!nft_set_elem_active(ext, genmask))
9516 continue;
9517
9518 ret = nft_check_loops(ctx, ext);
9519 if (ret < 0)
9520 return ret;
9521 }
9522
9523 return ret;
9524 }
9525
nf_tables_check_loops(const struct nft_ctx * ctx,const struct nft_chain * chain)9526 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9527 const struct nft_chain *chain)
9528 {
9529 const struct nft_rule *rule;
9530 const struct nft_expr *expr, *last;
9531 struct nft_set *set;
9532 struct nft_set_binding *binding;
9533 struct nft_set_iter iter;
9534
9535 if (ctx->chain == chain)
9536 return -ELOOP;
9537
9538 list_for_each_entry(rule, &chain->rules, list) {
9539 nft_rule_for_each_expr(expr, last, rule) {
9540 struct nft_immediate_expr *priv;
9541 const struct nft_data *data;
9542 int err;
9543
9544 if (strcmp(expr->ops->type->name, "immediate"))
9545 continue;
9546
9547 priv = nft_expr_priv(expr);
9548 if (priv->dreg != NFT_REG_VERDICT)
9549 continue;
9550
9551 data = &priv->data;
9552 switch (data->verdict.code) {
9553 case NFT_JUMP:
9554 case NFT_GOTO:
9555 err = nf_tables_check_loops(ctx,
9556 data->verdict.chain);
9557 if (err < 0)
9558 return err;
9559 break;
9560 default:
9561 break;
9562 }
9563 }
9564 }
9565
9566 list_for_each_entry(set, &ctx->table->sets, list) {
9567 if (!nft_is_active_next(ctx->net, set))
9568 continue;
9569 if (!(set->flags & NFT_SET_MAP) ||
9570 set->dtype != NFT_DATA_VERDICT)
9571 continue;
9572
9573 list_for_each_entry(binding, &set->bindings, list) {
9574 if (!(binding->flags & NFT_SET_MAP) ||
9575 binding->chain != chain)
9576 continue;
9577
9578 iter.genmask = nft_genmask_next(ctx->net);
9579 iter.skip = 0;
9580 iter.count = 0;
9581 iter.err = 0;
9582 iter.fn = nf_tables_loop_check_setelem;
9583
9584 set->ops->walk(ctx, set, &iter);
9585 if (!iter.err)
9586 iter.err = nft_set_catchall_loops(ctx, set);
9587
9588 if (iter.err < 0)
9589 return iter.err;
9590 }
9591 }
9592
9593 return 0;
9594 }
9595
9596 /**
9597 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
9598 *
9599 * @attr: netlink attribute to fetch value from
9600 * @max: maximum value to be stored in dest
9601 * @dest: pointer to the variable
9602 *
9603 * Parse, check and store a given u32 netlink attribute into variable.
9604 * This function returns -ERANGE if the value goes over maximum value.
9605 * Otherwise a 0 is returned and the attribute value is stored in the
9606 * destination variable.
9607 */
nft_parse_u32_check(const struct nlattr * attr,int max,u32 * dest)9608 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9609 {
9610 u32 val;
9611
9612 val = ntohl(nla_get_be32(attr));
9613 if (val > max)
9614 return -ERANGE;
9615
9616 *dest = val;
9617 return 0;
9618 }
9619 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9620
nft_parse_register(const struct nlattr * attr,u32 * preg)9621 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9622 {
9623 unsigned int reg;
9624
9625 reg = ntohl(nla_get_be32(attr));
9626 switch (reg) {
9627 case NFT_REG_VERDICT...NFT_REG_4:
9628 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9629 break;
9630 case NFT_REG32_00...NFT_REG32_15:
9631 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9632 break;
9633 default:
9634 return -ERANGE;
9635 }
9636
9637 return 0;
9638 }
9639
9640 /**
9641 * nft_dump_register - dump a register value to a netlink attribute
9642 *
9643 * @skb: socket buffer
9644 * @attr: attribute number
9645 * @reg: register number
9646 *
9647 * Construct a netlink attribute containing the register number. For
9648 * compatibility reasons, register numbers being a multiple of 4 are
9649 * translated to the corresponding 128 bit register numbers.
9650 */
nft_dump_register(struct sk_buff * skb,unsigned int attr,unsigned int reg)9651 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9652 {
9653 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9654 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9655 else
9656 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9657
9658 return nla_put_be32(skb, attr, htonl(reg));
9659 }
9660 EXPORT_SYMBOL_GPL(nft_dump_register);
9661
nft_validate_register_load(enum nft_registers reg,unsigned int len)9662 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9663 {
9664 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9665 return -EINVAL;
9666 if (len == 0)
9667 return -EINVAL;
9668 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9669 return -ERANGE;
9670
9671 return 0;
9672 }
9673
nft_parse_register_load(const struct nlattr * attr,u8 * sreg,u32 len)9674 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9675 {
9676 u32 reg;
9677 int err;
9678
9679 err = nft_parse_register(attr, ®);
9680 if (err < 0)
9681 return err;
9682
9683 err = nft_validate_register_load(reg, len);
9684 if (err < 0)
9685 return err;
9686
9687 *sreg = reg;
9688 return 0;
9689 }
9690 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9691
nft_validate_register_store(const struct nft_ctx * ctx,enum nft_registers reg,const struct nft_data * data,enum nft_data_types type,unsigned int len)9692 static int nft_validate_register_store(const struct nft_ctx *ctx,
9693 enum nft_registers reg,
9694 const struct nft_data *data,
9695 enum nft_data_types type,
9696 unsigned int len)
9697 {
9698 int err;
9699
9700 switch (reg) {
9701 case NFT_REG_VERDICT:
9702 if (type != NFT_DATA_VERDICT)
9703 return -EINVAL;
9704
9705 if (data != NULL &&
9706 (data->verdict.code == NFT_GOTO ||
9707 data->verdict.code == NFT_JUMP)) {
9708 err = nf_tables_check_loops(ctx, data->verdict.chain);
9709 if (err < 0)
9710 return err;
9711 }
9712
9713 return 0;
9714 default:
9715 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9716 return -EINVAL;
9717 if (len == 0)
9718 return -EINVAL;
9719 if (reg * NFT_REG32_SIZE + len >
9720 sizeof_field(struct nft_regs, data))
9721 return -ERANGE;
9722
9723 if (data != NULL && type != NFT_DATA_VALUE)
9724 return -EINVAL;
9725 return 0;
9726 }
9727 }
9728
nft_parse_register_store(const struct nft_ctx * ctx,const struct nlattr * attr,u8 * dreg,const struct nft_data * data,enum nft_data_types type,unsigned int len)9729 int nft_parse_register_store(const struct nft_ctx *ctx,
9730 const struct nlattr *attr, u8 *dreg,
9731 const struct nft_data *data,
9732 enum nft_data_types type, unsigned int len)
9733 {
9734 int err;
9735 u32 reg;
9736
9737 err = nft_parse_register(attr, ®);
9738 if (err < 0)
9739 return err;
9740
9741 err = nft_validate_register_store(ctx, reg, data, type, len);
9742 if (err < 0)
9743 return err;
9744
9745 *dreg = reg;
9746 return 0;
9747 }
9748 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9749
9750 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9751 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
9752 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
9753 .len = NFT_CHAIN_MAXNAMELEN - 1 },
9754 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9755 };
9756
nft_verdict_init(const struct nft_ctx * ctx,struct nft_data * data,struct nft_data_desc * desc,const struct nlattr * nla)9757 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9758 struct nft_data_desc *desc, const struct nlattr *nla)
9759 {
9760 u8 genmask = nft_genmask_next(ctx->net);
9761 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9762 struct nft_chain *chain;
9763 int err;
9764
9765 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9766 nft_verdict_policy, NULL);
9767 if (err < 0)
9768 return err;
9769
9770 if (!tb[NFTA_VERDICT_CODE])
9771 return -EINVAL;
9772 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9773
9774 switch (data->verdict.code) {
9775 default:
9776 switch (data->verdict.code & NF_VERDICT_MASK) {
9777 case NF_ACCEPT:
9778 case NF_DROP:
9779 case NF_QUEUE:
9780 break;
9781 default:
9782 return -EINVAL;
9783 }
9784 fallthrough;
9785 case NFT_CONTINUE:
9786 case NFT_BREAK:
9787 case NFT_RETURN:
9788 break;
9789 case NFT_JUMP:
9790 case NFT_GOTO:
9791 if (tb[NFTA_VERDICT_CHAIN]) {
9792 chain = nft_chain_lookup(ctx->net, ctx->table,
9793 tb[NFTA_VERDICT_CHAIN],
9794 genmask);
9795 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9796 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
9797 tb[NFTA_VERDICT_CHAIN_ID]);
9798 if (IS_ERR(chain))
9799 return PTR_ERR(chain);
9800 } else {
9801 return -EINVAL;
9802 }
9803
9804 if (IS_ERR(chain))
9805 return PTR_ERR(chain);
9806 if (nft_is_base_chain(chain))
9807 return -EOPNOTSUPP;
9808 if (nft_chain_is_bound(chain))
9809 return -EINVAL;
9810 if (desc->flags & NFT_DATA_DESC_SETELEM &&
9811 chain->flags & NFT_CHAIN_BINDING)
9812 return -EINVAL;
9813
9814 chain->use++;
9815 data->verdict.chain = chain;
9816 break;
9817 }
9818
9819 desc->len = sizeof(data->verdict);
9820
9821 return 0;
9822 }
9823
nft_verdict_uninit(const struct nft_data * data)9824 static void nft_verdict_uninit(const struct nft_data *data)
9825 {
9826 struct nft_chain *chain;
9827 struct nft_rule *rule;
9828
9829 switch (data->verdict.code) {
9830 case NFT_JUMP:
9831 case NFT_GOTO:
9832 chain = data->verdict.chain;
9833 chain->use--;
9834
9835 if (!nft_chain_is_bound(chain))
9836 break;
9837
9838 chain->table->use--;
9839 list_for_each_entry(rule, &chain->rules, list)
9840 chain->use--;
9841
9842 nft_chain_del(chain);
9843 break;
9844 }
9845 }
9846
nft_verdict_dump(struct sk_buff * skb,int type,const struct nft_verdict * v)9847 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9848 {
9849 struct nlattr *nest;
9850
9851 nest = nla_nest_start_noflag(skb, type);
9852 if (!nest)
9853 goto nla_put_failure;
9854
9855 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9856 goto nla_put_failure;
9857
9858 switch (v->code) {
9859 case NFT_JUMP:
9860 case NFT_GOTO:
9861 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9862 v->chain->name))
9863 goto nla_put_failure;
9864 }
9865 nla_nest_end(skb, nest);
9866 return 0;
9867
9868 nla_put_failure:
9869 return -1;
9870 }
9871
nft_value_init(const struct nft_ctx * ctx,struct nft_data * data,struct nft_data_desc * desc,const struct nlattr * nla)9872 static int nft_value_init(const struct nft_ctx *ctx,
9873 struct nft_data *data, struct nft_data_desc *desc,
9874 const struct nlattr *nla)
9875 {
9876 unsigned int len;
9877
9878 len = nla_len(nla);
9879 if (len == 0)
9880 return -EINVAL;
9881 if (len > desc->size)
9882 return -EOVERFLOW;
9883 if (desc->len) {
9884 if (len != desc->len)
9885 return -EINVAL;
9886 } else {
9887 desc->len = len;
9888 }
9889
9890 nla_memcpy(data->data, nla, len);
9891
9892 return 0;
9893 }
9894
nft_value_dump(struct sk_buff * skb,const struct nft_data * data,unsigned int len)9895 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9896 unsigned int len)
9897 {
9898 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9899 }
9900
9901 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9902 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
9903 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
9904 };
9905
9906 /**
9907 * nft_data_init - parse nf_tables data netlink attributes
9908 *
9909 * @ctx: context of the expression using the data
9910 * @data: destination struct nft_data
9911 * @desc: data description
9912 * @nla: netlink attribute containing data
9913 *
9914 * Parse the netlink data attributes and initialize a struct nft_data.
9915 * The type and length of data are returned in the data description.
9916 *
9917 * The caller can indicate that it only wants to accept data of type
9918 * NFT_DATA_VALUE by passing NULL for the ctx argument.
9919 */
nft_data_init(const struct nft_ctx * ctx,struct nft_data * data,struct nft_data_desc * desc,const struct nlattr * nla)9920 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
9921 struct nft_data_desc *desc, const struct nlattr *nla)
9922 {
9923 struct nlattr *tb[NFTA_DATA_MAX + 1];
9924 int err;
9925
9926 if (WARN_ON_ONCE(!desc->size))
9927 return -EINVAL;
9928
9929 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9930 nft_data_policy, NULL);
9931 if (err < 0)
9932 return err;
9933
9934 if (tb[NFTA_DATA_VALUE]) {
9935 if (desc->type != NFT_DATA_VALUE)
9936 return -EINVAL;
9937
9938 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
9939 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
9940 if (desc->type != NFT_DATA_VERDICT)
9941 return -EINVAL;
9942
9943 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9944 } else {
9945 err = -EINVAL;
9946 }
9947
9948 return err;
9949 }
9950 EXPORT_SYMBOL_GPL(nft_data_init);
9951
9952 /**
9953 * nft_data_release - release a nft_data item
9954 *
9955 * @data: struct nft_data to release
9956 * @type: type of data
9957 *
9958 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9959 * all others need to be released by calling this function.
9960 */
nft_data_release(const struct nft_data * data,enum nft_data_types type)9961 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9962 {
9963 if (type < NFT_DATA_VERDICT)
9964 return;
9965 switch (type) {
9966 case NFT_DATA_VERDICT:
9967 return nft_verdict_uninit(data);
9968 default:
9969 WARN_ON(1);
9970 }
9971 }
9972 EXPORT_SYMBOL_GPL(nft_data_release);
9973
nft_data_dump(struct sk_buff * skb,int attr,const struct nft_data * data,enum nft_data_types type,unsigned int len)9974 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9975 enum nft_data_types type, unsigned int len)
9976 {
9977 struct nlattr *nest;
9978 int err;
9979
9980 nest = nla_nest_start_noflag(skb, attr);
9981 if (nest == NULL)
9982 return -1;
9983
9984 switch (type) {
9985 case NFT_DATA_VALUE:
9986 err = nft_value_dump(skb, data, len);
9987 break;
9988 case NFT_DATA_VERDICT:
9989 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9990 break;
9991 default:
9992 err = -EINVAL;
9993 WARN_ON(1);
9994 }
9995
9996 nla_nest_end(skb, nest);
9997 return err;
9998 }
9999 EXPORT_SYMBOL_GPL(nft_data_dump);
10000
__nft_release_basechain(struct nft_ctx * ctx)10001 int __nft_release_basechain(struct nft_ctx *ctx)
10002 {
10003 struct nft_rule *rule, *nr;
10004
10005 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10006 return 0;
10007
10008 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10009 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10010 list_del(&rule->list);
10011 ctx->chain->use--;
10012 nf_tables_rule_release(ctx, rule);
10013 }
10014 nft_chain_del(ctx->chain);
10015 ctx->table->use--;
10016 nf_tables_chain_destroy(ctx);
10017
10018 return 0;
10019 }
10020 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10021
__nft_release_hook(struct net * net,struct nft_table * table)10022 static void __nft_release_hook(struct net *net, struct nft_table *table)
10023 {
10024 struct nft_flowtable *flowtable;
10025 struct nft_chain *chain;
10026
10027 list_for_each_entry(chain, &table->chains, list)
10028 __nf_tables_unregister_hook(net, table, chain, true);
10029 list_for_each_entry(flowtable, &table->flowtables, list)
10030 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10031 true);
10032 }
10033
__nft_release_hooks(struct net * net)10034 static void __nft_release_hooks(struct net *net)
10035 {
10036 struct nftables_pernet *nft_net = nft_pernet(net);
10037 struct nft_table *table;
10038
10039 list_for_each_entry(table, &nft_net->tables, list) {
10040 if (nft_table_has_owner(table))
10041 continue;
10042
10043 __nft_release_hook(net, table);
10044 }
10045 }
10046
__nft_release_table(struct net * net,struct nft_table * table)10047 static void __nft_release_table(struct net *net, struct nft_table *table)
10048 {
10049 struct nft_flowtable *flowtable, *nf;
10050 struct nft_chain *chain, *nc;
10051 struct nft_object *obj, *ne;
10052 struct nft_rule *rule, *nr;
10053 struct nft_set *set, *ns;
10054 struct nft_ctx ctx = {
10055 .net = net,
10056 .family = NFPROTO_NETDEV,
10057 };
10058
10059 ctx.family = table->family;
10060 ctx.table = table;
10061 list_for_each_entry(chain, &table->chains, list) {
10062 ctx.chain = chain;
10063 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10064 list_del(&rule->list);
10065 chain->use--;
10066 nf_tables_rule_release(&ctx, rule);
10067 }
10068 }
10069 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10070 list_del(&flowtable->list);
10071 table->use--;
10072 nf_tables_flowtable_destroy(flowtable);
10073 }
10074 list_for_each_entry_safe(set, ns, &table->sets, list) {
10075 list_del(&set->list);
10076 table->use--;
10077 nft_set_destroy(&ctx, set);
10078 }
10079 list_for_each_entry_safe(obj, ne, &table->objects, list) {
10080 nft_obj_del(obj);
10081 table->use--;
10082 nft_obj_destroy(&ctx, obj);
10083 }
10084 list_for_each_entry_safe(chain, nc, &table->chains, list) {
10085 ctx.chain = chain;
10086 nft_chain_del(chain);
10087 table->use--;
10088 nf_tables_chain_destroy(&ctx);
10089 }
10090 nf_tables_table_destroy(&ctx);
10091 }
10092
__nft_release_tables(struct net * net)10093 static void __nft_release_tables(struct net *net)
10094 {
10095 struct nftables_pernet *nft_net = nft_pernet(net);
10096 struct nft_table *table, *nt;
10097
10098 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10099 if (nft_table_has_owner(table))
10100 continue;
10101
10102 list_del(&table->list);
10103
10104 __nft_release_table(net, table);
10105 }
10106 }
10107
nft_rcv_nl_event(struct notifier_block * this,unsigned long event,void * ptr)10108 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10109 void *ptr)
10110 {
10111 struct nft_table *table, *to_delete[8];
10112 struct nftables_pernet *nft_net;
10113 struct netlink_notify *n = ptr;
10114 struct net *net = n->net;
10115 unsigned int deleted;
10116 bool restart = false;
10117
10118 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10119 return NOTIFY_DONE;
10120
10121 nft_net = nft_pernet(net);
10122 deleted = 0;
10123 mutex_lock(&nft_net->commit_mutex);
10124 if (!list_empty(&nf_tables_destroy_list))
10125 rcu_barrier();
10126 again:
10127 list_for_each_entry(table, &nft_net->tables, list) {
10128 if (nft_table_has_owner(table) &&
10129 n->portid == table->nlpid) {
10130 __nft_release_hook(net, table);
10131 list_del_rcu(&table->list);
10132 to_delete[deleted++] = table;
10133 if (deleted >= ARRAY_SIZE(to_delete))
10134 break;
10135 }
10136 }
10137 if (deleted) {
10138 restart = deleted >= ARRAY_SIZE(to_delete);
10139 synchronize_rcu();
10140 while (deleted)
10141 __nft_release_table(net, to_delete[--deleted]);
10142
10143 if (restart)
10144 goto again;
10145 }
10146 mutex_unlock(&nft_net->commit_mutex);
10147
10148 return NOTIFY_DONE;
10149 }
10150
10151 static struct notifier_block nft_nl_notifier = {
10152 .notifier_call = nft_rcv_nl_event,
10153 };
10154
nf_tables_init_net(struct net * net)10155 static int __net_init nf_tables_init_net(struct net *net)
10156 {
10157 struct nftables_pernet *nft_net = nft_pernet(net);
10158
10159 INIT_LIST_HEAD(&nft_net->tables);
10160 INIT_LIST_HEAD(&nft_net->commit_list);
10161 INIT_LIST_HEAD(&nft_net->module_list);
10162 INIT_LIST_HEAD(&nft_net->notify_list);
10163 mutex_init(&nft_net->commit_mutex);
10164 nft_net->base_seq = 1;
10165 nft_net->validate_state = NFT_VALIDATE_SKIP;
10166
10167 return 0;
10168 }
10169
nf_tables_pre_exit_net(struct net * net)10170 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10171 {
10172 struct nftables_pernet *nft_net = nft_pernet(net);
10173
10174 mutex_lock(&nft_net->commit_mutex);
10175 __nft_release_hooks(net);
10176 mutex_unlock(&nft_net->commit_mutex);
10177 }
10178
nf_tables_exit_net(struct net * net)10179 static void __net_exit nf_tables_exit_net(struct net *net)
10180 {
10181 struct nftables_pernet *nft_net = nft_pernet(net);
10182
10183 mutex_lock(&nft_net->commit_mutex);
10184 if (!list_empty(&nft_net->commit_list) ||
10185 !list_empty(&nft_net->module_list))
10186 __nf_tables_abort(net, NFNL_ABORT_NONE);
10187 __nft_release_tables(net);
10188 mutex_unlock(&nft_net->commit_mutex);
10189 WARN_ON_ONCE(!list_empty(&nft_net->tables));
10190 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10191 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10192 }
10193
10194 static struct pernet_operations nf_tables_net_ops = {
10195 .init = nf_tables_init_net,
10196 .pre_exit = nf_tables_pre_exit_net,
10197 .exit = nf_tables_exit_net,
10198 .id = &nf_tables_net_id,
10199 .size = sizeof(struct nftables_pernet),
10200 };
10201
nf_tables_module_init(void)10202 static int __init nf_tables_module_init(void)
10203 {
10204 int err;
10205
10206 err = register_pernet_subsys(&nf_tables_net_ops);
10207 if (err < 0)
10208 return err;
10209
10210 err = nft_chain_filter_init();
10211 if (err < 0)
10212 goto err_chain_filter;
10213
10214 err = nf_tables_core_module_init();
10215 if (err < 0)
10216 goto err_core_module;
10217
10218 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10219 if (err < 0)
10220 goto err_netdev_notifier;
10221
10222 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10223 if (err < 0)
10224 goto err_rht_objname;
10225
10226 err = nft_offload_init();
10227 if (err < 0)
10228 goto err_offload;
10229
10230 err = netlink_register_notifier(&nft_nl_notifier);
10231 if (err < 0)
10232 goto err_netlink_notifier;
10233
10234 /* must be last */
10235 err = nfnetlink_subsys_register(&nf_tables_subsys);
10236 if (err < 0)
10237 goto err_nfnl_subsys;
10238
10239 nft_chain_route_init();
10240
10241 return err;
10242
10243 err_nfnl_subsys:
10244 netlink_unregister_notifier(&nft_nl_notifier);
10245 err_netlink_notifier:
10246 nft_offload_exit();
10247 err_offload:
10248 rhltable_destroy(&nft_objname_ht);
10249 err_rht_objname:
10250 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10251 err_netdev_notifier:
10252 nf_tables_core_module_exit();
10253 err_core_module:
10254 nft_chain_filter_fini();
10255 err_chain_filter:
10256 unregister_pernet_subsys(&nf_tables_net_ops);
10257 return err;
10258 }
10259
nf_tables_module_exit(void)10260 static void __exit nf_tables_module_exit(void)
10261 {
10262 nfnetlink_subsys_unregister(&nf_tables_subsys);
10263 netlink_unregister_notifier(&nft_nl_notifier);
10264 nft_offload_exit();
10265 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10266 nft_chain_filter_fini();
10267 nft_chain_route_fini();
10268 unregister_pernet_subsys(&nf_tables_net_ops);
10269 cancel_work_sync(&trans_destroy_work);
10270 rcu_barrier();
10271 rhltable_destroy(&nft_objname_ht);
10272 nf_tables_core_module_exit();
10273 }
10274
10275 module_init(nf_tables_module_init);
10276 module_exit(nf_tables_module_exit);
10277
10278 MODULE_LICENSE("GPL");
10279 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10280 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
10281