1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/kernel.h>
3 #include <linux/init.h>
4 #include <linux/module.h>
5 #include <linux/netfilter.h>
6 #include <linux/rhashtable.h>
7 #include <linux/netdevice.h>
8 #include <net/ip.h>
9 #include <net/ip6_route.h>
10 #include <net/netfilter/nf_tables.h>
11 #include <net/netfilter/nf_flow_table.h>
12 #include <net/netfilter/nf_conntrack.h>
13 #include <net/netfilter/nf_conntrack_core.h>
14 #include <net/netfilter/nf_conntrack_l4proto.h>
15 #include <net/netfilter/nf_conntrack_tuple.h>
16
17 static DEFINE_MUTEX(flowtable_lock);
18 static LIST_HEAD(flowtables);
19
20 static void
flow_offload_fill_dir(struct flow_offload * flow,enum flow_offload_tuple_dir dir)21 flow_offload_fill_dir(struct flow_offload *flow,
22 enum flow_offload_tuple_dir dir)
23 {
24 struct flow_offload_tuple *ft = &flow->tuplehash[dir].tuple;
25 struct nf_conntrack_tuple *ctt = &flow->ct->tuplehash[dir].tuple;
26
27 ft->dir = dir;
28
29 switch (ctt->src.l3num) {
30 case NFPROTO_IPV4:
31 ft->src_v4 = ctt->src.u3.in;
32 ft->dst_v4 = ctt->dst.u3.in;
33 break;
34 case NFPROTO_IPV6:
35 ft->src_v6 = ctt->src.u3.in6;
36 ft->dst_v6 = ctt->dst.u3.in6;
37 break;
38 }
39
40 ft->l3proto = ctt->src.l3num;
41 ft->l4proto = ctt->dst.protonum;
42
43 switch (ctt->dst.protonum) {
44 case IPPROTO_TCP:
45 case IPPROTO_UDP:
46 ft->src_port = ctt->src.u.tcp.port;
47 ft->dst_port = ctt->dst.u.tcp.port;
48 break;
49 }
50 }
51
flow_offload_alloc(struct nf_conn * ct)52 struct flow_offload *flow_offload_alloc(struct nf_conn *ct)
53 {
54 struct flow_offload *flow;
55
56 if (unlikely(nf_ct_is_dying(ct)))
57 return NULL;
58
59 flow = kzalloc(sizeof(*flow), GFP_ATOMIC);
60 if (!flow)
61 return NULL;
62
63 refcount_inc(&ct->ct_general.use);
64 flow->ct = ct;
65
66 flow_offload_fill_dir(flow, FLOW_OFFLOAD_DIR_ORIGINAL);
67 flow_offload_fill_dir(flow, FLOW_OFFLOAD_DIR_REPLY);
68
69 if (ct->status & IPS_SRC_NAT)
70 __set_bit(NF_FLOW_SNAT, &flow->flags);
71 if (ct->status & IPS_DST_NAT)
72 __set_bit(NF_FLOW_DNAT, &flow->flags);
73
74 return flow;
75 }
76 EXPORT_SYMBOL_GPL(flow_offload_alloc);
77
flow_offload_dst_cookie(struct flow_offload_tuple * flow_tuple)78 static u32 flow_offload_dst_cookie(struct flow_offload_tuple *flow_tuple)
79 {
80 const struct rt6_info *rt;
81
82 if (flow_tuple->l3proto == NFPROTO_IPV6) {
83 rt = (const struct rt6_info *)flow_tuple->dst_cache;
84 return rt6_get_cookie(rt);
85 }
86
87 return 0;
88 }
89
flow_offload_fill_route(struct flow_offload * flow,const struct nf_flow_route * route,enum flow_offload_tuple_dir dir)90 static int flow_offload_fill_route(struct flow_offload *flow,
91 const struct nf_flow_route *route,
92 enum flow_offload_tuple_dir dir)
93 {
94 struct flow_offload_tuple *flow_tuple = &flow->tuplehash[dir].tuple;
95 struct dst_entry *dst = route->tuple[dir].dst;
96 int i, j = 0;
97
98 switch (flow_tuple->l3proto) {
99 case NFPROTO_IPV4:
100 flow_tuple->mtu = ip_dst_mtu_maybe_forward(dst, true);
101 break;
102 case NFPROTO_IPV6:
103 flow_tuple->mtu = ip6_dst_mtu_maybe_forward(dst, true);
104 break;
105 }
106
107 flow_tuple->iifidx = route->tuple[dir].in.ifindex;
108 for (i = route->tuple[dir].in.num_encaps - 1; i >= 0; i--) {
109 flow_tuple->encap[j].id = route->tuple[dir].in.encap[i].id;
110 flow_tuple->encap[j].proto = route->tuple[dir].in.encap[i].proto;
111 if (route->tuple[dir].in.ingress_vlans & BIT(i))
112 flow_tuple->in_vlan_ingress |= BIT(j);
113 j++;
114 }
115 flow_tuple->encap_num = route->tuple[dir].in.num_encaps;
116
117 switch (route->tuple[dir].xmit_type) {
118 case FLOW_OFFLOAD_XMIT_DIRECT:
119 memcpy(flow_tuple->out.h_dest, route->tuple[dir].out.h_dest,
120 ETH_ALEN);
121 memcpy(flow_tuple->out.h_source, route->tuple[dir].out.h_source,
122 ETH_ALEN);
123 flow_tuple->out.ifidx = route->tuple[dir].out.ifindex;
124 flow_tuple->out.hw_ifidx = route->tuple[dir].out.hw_ifindex;
125 break;
126 case FLOW_OFFLOAD_XMIT_XFRM:
127 case FLOW_OFFLOAD_XMIT_NEIGH:
128 if (!dst_hold_safe(route->tuple[dir].dst))
129 return -1;
130
131 flow_tuple->dst_cache = dst;
132 flow_tuple->dst_cookie = flow_offload_dst_cookie(flow_tuple);
133 break;
134 default:
135 WARN_ON_ONCE(1);
136 break;
137 }
138 flow_tuple->xmit_type = route->tuple[dir].xmit_type;
139
140 return 0;
141 }
142
nft_flow_dst_release(struct flow_offload * flow,enum flow_offload_tuple_dir dir)143 static void nft_flow_dst_release(struct flow_offload *flow,
144 enum flow_offload_tuple_dir dir)
145 {
146 if (flow->tuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_NEIGH ||
147 flow->tuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_XFRM)
148 dst_release(flow->tuplehash[dir].tuple.dst_cache);
149 }
150
flow_offload_route_init(struct flow_offload * flow,const struct nf_flow_route * route)151 int flow_offload_route_init(struct flow_offload *flow,
152 const struct nf_flow_route *route)
153 {
154 int err;
155
156 err = flow_offload_fill_route(flow, route, FLOW_OFFLOAD_DIR_ORIGINAL);
157 if (err < 0)
158 return err;
159
160 err = flow_offload_fill_route(flow, route, FLOW_OFFLOAD_DIR_REPLY);
161 if (err < 0)
162 goto err_route_reply;
163
164 flow->type = NF_FLOW_OFFLOAD_ROUTE;
165
166 return 0;
167
168 err_route_reply:
169 nft_flow_dst_release(flow, FLOW_OFFLOAD_DIR_ORIGINAL);
170
171 return err;
172 }
173 EXPORT_SYMBOL_GPL(flow_offload_route_init);
174
flow_offload_fixup_tcp(struct ip_ct_tcp * tcp)175 static void flow_offload_fixup_tcp(struct ip_ct_tcp *tcp)
176 {
177 tcp->seen[0].td_maxwin = 0;
178 tcp->seen[1].td_maxwin = 0;
179 }
180
flow_offload_fixup_ct(struct nf_conn * ct)181 static void flow_offload_fixup_ct(struct nf_conn *ct)
182 {
183 struct net *net = nf_ct_net(ct);
184 int l4num = nf_ct_protonum(ct);
185 s32 timeout;
186
187 if (l4num == IPPROTO_TCP) {
188 struct nf_tcp_net *tn = nf_tcp_pernet(net);
189
190 flow_offload_fixup_tcp(&ct->proto.tcp);
191
192 timeout = tn->timeouts[ct->proto.tcp.state];
193 timeout -= tn->offload_timeout;
194 } else if (l4num == IPPROTO_UDP) {
195 struct nf_udp_net *tn = nf_udp_pernet(net);
196
197 timeout = tn->timeouts[UDP_CT_REPLIED];
198 timeout -= tn->offload_timeout;
199 } else {
200 return;
201 }
202
203 if (timeout < 0)
204 timeout = 0;
205
206 if (nf_flow_timeout_delta(READ_ONCE(ct->timeout)) > (__s32)timeout)
207 WRITE_ONCE(ct->timeout, nfct_time_stamp + timeout);
208 }
209
flow_offload_route_release(struct flow_offload * flow)210 static void flow_offload_route_release(struct flow_offload *flow)
211 {
212 nft_flow_dst_release(flow, FLOW_OFFLOAD_DIR_ORIGINAL);
213 nft_flow_dst_release(flow, FLOW_OFFLOAD_DIR_REPLY);
214 }
215
flow_offload_free(struct flow_offload * flow)216 void flow_offload_free(struct flow_offload *flow)
217 {
218 switch (flow->type) {
219 case NF_FLOW_OFFLOAD_ROUTE:
220 flow_offload_route_release(flow);
221 break;
222 default:
223 break;
224 }
225 nf_ct_put(flow->ct);
226 kfree_rcu(flow, rcu_head);
227 }
228 EXPORT_SYMBOL_GPL(flow_offload_free);
229
flow_offload_hash(const void * data,u32 len,u32 seed)230 static u32 flow_offload_hash(const void *data, u32 len, u32 seed)
231 {
232 const struct flow_offload_tuple *tuple = data;
233
234 return jhash(tuple, offsetof(struct flow_offload_tuple, __hash), seed);
235 }
236
flow_offload_hash_obj(const void * data,u32 len,u32 seed)237 static u32 flow_offload_hash_obj(const void *data, u32 len, u32 seed)
238 {
239 const struct flow_offload_tuple_rhash *tuplehash = data;
240
241 return jhash(&tuplehash->tuple, offsetof(struct flow_offload_tuple, __hash), seed);
242 }
243
flow_offload_hash_cmp(struct rhashtable_compare_arg * arg,const void * ptr)244 static int flow_offload_hash_cmp(struct rhashtable_compare_arg *arg,
245 const void *ptr)
246 {
247 const struct flow_offload_tuple *tuple = arg->key;
248 const struct flow_offload_tuple_rhash *x = ptr;
249
250 if (memcmp(&x->tuple, tuple, offsetof(struct flow_offload_tuple, __hash)))
251 return 1;
252
253 return 0;
254 }
255
256 static const struct rhashtable_params nf_flow_offload_rhash_params = {
257 .head_offset = offsetof(struct flow_offload_tuple_rhash, node),
258 .hashfn = flow_offload_hash,
259 .obj_hashfn = flow_offload_hash_obj,
260 .obj_cmpfn = flow_offload_hash_cmp,
261 .automatic_shrinking = true,
262 };
263
flow_offload_get_timeout(struct flow_offload * flow)264 unsigned long flow_offload_get_timeout(struct flow_offload *flow)
265 {
266 unsigned long timeout = NF_FLOW_TIMEOUT;
267 struct net *net = nf_ct_net(flow->ct);
268 int l4num = nf_ct_protonum(flow->ct);
269
270 if (l4num == IPPROTO_TCP) {
271 struct nf_tcp_net *tn = nf_tcp_pernet(net);
272
273 timeout = tn->offload_timeout;
274 } else if (l4num == IPPROTO_UDP) {
275 struct nf_udp_net *tn = nf_udp_pernet(net);
276
277 timeout = tn->offload_timeout;
278 }
279
280 return timeout;
281 }
282
flow_offload_add(struct nf_flowtable * flow_table,struct flow_offload * flow)283 int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow)
284 {
285 int err;
286
287 flow->timeout = nf_flowtable_time_stamp + flow_offload_get_timeout(flow);
288
289 err = rhashtable_insert_fast(&flow_table->rhashtable,
290 &flow->tuplehash[0].node,
291 nf_flow_offload_rhash_params);
292 if (err < 0)
293 return err;
294
295 err = rhashtable_insert_fast(&flow_table->rhashtable,
296 &flow->tuplehash[1].node,
297 nf_flow_offload_rhash_params);
298 if (err < 0) {
299 rhashtable_remove_fast(&flow_table->rhashtable,
300 &flow->tuplehash[0].node,
301 nf_flow_offload_rhash_params);
302 return err;
303 }
304
305 nf_ct_offload_timeout(flow->ct);
306
307 if (nf_flowtable_hw_offload(flow_table)) {
308 __set_bit(NF_FLOW_HW, &flow->flags);
309 nf_flow_offload_add(flow_table, flow);
310 }
311
312 return 0;
313 }
314 EXPORT_SYMBOL_GPL(flow_offload_add);
315
flow_offload_refresh(struct nf_flowtable * flow_table,struct flow_offload * flow)316 void flow_offload_refresh(struct nf_flowtable *flow_table,
317 struct flow_offload *flow)
318 {
319 u32 timeout;
320
321 timeout = nf_flowtable_time_stamp + flow_offload_get_timeout(flow);
322 if (timeout - READ_ONCE(flow->timeout) > HZ)
323 WRITE_ONCE(flow->timeout, timeout);
324 else
325 return;
326
327 if (likely(!nf_flowtable_hw_offload(flow_table)))
328 return;
329
330 nf_flow_offload_add(flow_table, flow);
331 }
332 EXPORT_SYMBOL_GPL(flow_offload_refresh);
333
nf_flow_has_expired(const struct flow_offload * flow)334 static inline bool nf_flow_has_expired(const struct flow_offload *flow)
335 {
336 return nf_flow_timeout_delta(flow->timeout) <= 0;
337 }
338
flow_offload_del(struct nf_flowtable * flow_table,struct flow_offload * flow)339 static void flow_offload_del(struct nf_flowtable *flow_table,
340 struct flow_offload *flow)
341 {
342 rhashtable_remove_fast(&flow_table->rhashtable,
343 &flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].node,
344 nf_flow_offload_rhash_params);
345 rhashtable_remove_fast(&flow_table->rhashtable,
346 &flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].node,
347 nf_flow_offload_rhash_params);
348 flow_offload_free(flow);
349 }
350
flow_offload_teardown(struct flow_offload * flow)351 void flow_offload_teardown(struct flow_offload *flow)
352 {
353 clear_bit(IPS_OFFLOAD_BIT, &flow->ct->status);
354 set_bit(NF_FLOW_TEARDOWN, &flow->flags);
355 flow_offload_fixup_ct(flow->ct);
356 }
357 EXPORT_SYMBOL_GPL(flow_offload_teardown);
358
359 struct flow_offload_tuple_rhash *
flow_offload_lookup(struct nf_flowtable * flow_table,struct flow_offload_tuple * tuple)360 flow_offload_lookup(struct nf_flowtable *flow_table,
361 struct flow_offload_tuple *tuple)
362 {
363 struct flow_offload_tuple_rhash *tuplehash;
364 struct flow_offload *flow;
365 int dir;
366
367 tuplehash = rhashtable_lookup(&flow_table->rhashtable, tuple,
368 nf_flow_offload_rhash_params);
369 if (!tuplehash)
370 return NULL;
371
372 dir = tuplehash->tuple.dir;
373 flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
374 if (test_bit(NF_FLOW_TEARDOWN, &flow->flags))
375 return NULL;
376
377 if (unlikely(nf_ct_is_dying(flow->ct)))
378 return NULL;
379
380 return tuplehash;
381 }
382 EXPORT_SYMBOL_GPL(flow_offload_lookup);
383
384 static int
nf_flow_table_iterate(struct nf_flowtable * flow_table,void (* iter)(struct nf_flowtable * flowtable,struct flow_offload * flow,void * data),void * data)385 nf_flow_table_iterate(struct nf_flowtable *flow_table,
386 void (*iter)(struct nf_flowtable *flowtable,
387 struct flow_offload *flow, void *data),
388 void *data)
389 {
390 struct flow_offload_tuple_rhash *tuplehash;
391 struct rhashtable_iter hti;
392 struct flow_offload *flow;
393 int err = 0;
394
395 rhashtable_walk_enter(&flow_table->rhashtable, &hti);
396 rhashtable_walk_start(&hti);
397
398 while ((tuplehash = rhashtable_walk_next(&hti))) {
399 if (IS_ERR(tuplehash)) {
400 if (PTR_ERR(tuplehash) != -EAGAIN) {
401 err = PTR_ERR(tuplehash);
402 break;
403 }
404 continue;
405 }
406 if (tuplehash->tuple.dir)
407 continue;
408
409 flow = container_of(tuplehash, struct flow_offload, tuplehash[0]);
410
411 iter(flow_table, flow, data);
412 }
413 rhashtable_walk_stop(&hti);
414 rhashtable_walk_exit(&hti);
415
416 return err;
417 }
418
nf_flow_offload_gc_step(struct nf_flowtable * flow_table,struct flow_offload * flow,void * data)419 static void nf_flow_offload_gc_step(struct nf_flowtable *flow_table,
420 struct flow_offload *flow, void *data)
421 {
422 if (nf_flow_has_expired(flow) ||
423 nf_ct_is_dying(flow->ct))
424 flow_offload_teardown(flow);
425
426 if (test_bit(NF_FLOW_TEARDOWN, &flow->flags)) {
427 if (test_bit(NF_FLOW_HW, &flow->flags)) {
428 if (!test_bit(NF_FLOW_HW_DYING, &flow->flags))
429 nf_flow_offload_del(flow_table, flow);
430 else if (test_bit(NF_FLOW_HW_DEAD, &flow->flags))
431 flow_offload_del(flow_table, flow);
432 } else {
433 flow_offload_del(flow_table, flow);
434 }
435 } else if (test_bit(NF_FLOW_HW, &flow->flags)) {
436 nf_flow_offload_stats(flow_table, flow);
437 }
438 }
439
nf_flow_table_gc_run(struct nf_flowtable * flow_table)440 void nf_flow_table_gc_run(struct nf_flowtable *flow_table)
441 {
442 nf_flow_table_iterate(flow_table, nf_flow_offload_gc_step, NULL);
443 }
444
nf_flow_offload_work_gc(struct work_struct * work)445 static void nf_flow_offload_work_gc(struct work_struct *work)
446 {
447 struct nf_flowtable *flow_table;
448
449 flow_table = container_of(work, struct nf_flowtable, gc_work.work);
450 nf_flow_table_gc_run(flow_table);
451 queue_delayed_work(system_power_efficient_wq, &flow_table->gc_work, HZ);
452 }
453
nf_flow_nat_port_tcp(struct sk_buff * skb,unsigned int thoff,__be16 port,__be16 new_port)454 static void nf_flow_nat_port_tcp(struct sk_buff *skb, unsigned int thoff,
455 __be16 port, __be16 new_port)
456 {
457 struct tcphdr *tcph;
458
459 tcph = (void *)(skb_network_header(skb) + thoff);
460 inet_proto_csum_replace2(&tcph->check, skb, port, new_port, false);
461 }
462
nf_flow_nat_port_udp(struct sk_buff * skb,unsigned int thoff,__be16 port,__be16 new_port)463 static void nf_flow_nat_port_udp(struct sk_buff *skb, unsigned int thoff,
464 __be16 port, __be16 new_port)
465 {
466 struct udphdr *udph;
467
468 udph = (void *)(skb_network_header(skb) + thoff);
469 if (udph->check || skb->ip_summed == CHECKSUM_PARTIAL) {
470 inet_proto_csum_replace2(&udph->check, skb, port,
471 new_port, false);
472 if (!udph->check)
473 udph->check = CSUM_MANGLED_0;
474 }
475 }
476
nf_flow_nat_port(struct sk_buff * skb,unsigned int thoff,u8 protocol,__be16 port,__be16 new_port)477 static void nf_flow_nat_port(struct sk_buff *skb, unsigned int thoff,
478 u8 protocol, __be16 port, __be16 new_port)
479 {
480 switch (protocol) {
481 case IPPROTO_TCP:
482 nf_flow_nat_port_tcp(skb, thoff, port, new_port);
483 break;
484 case IPPROTO_UDP:
485 nf_flow_nat_port_udp(skb, thoff, port, new_port);
486 break;
487 }
488 }
489
nf_flow_snat_port(const struct flow_offload * flow,struct sk_buff * skb,unsigned int thoff,u8 protocol,enum flow_offload_tuple_dir dir)490 void nf_flow_snat_port(const struct flow_offload *flow,
491 struct sk_buff *skb, unsigned int thoff,
492 u8 protocol, enum flow_offload_tuple_dir dir)
493 {
494 struct flow_ports *hdr;
495 __be16 port, new_port;
496
497 hdr = (void *)(skb_network_header(skb) + thoff);
498
499 switch (dir) {
500 case FLOW_OFFLOAD_DIR_ORIGINAL:
501 port = hdr->source;
502 new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_port;
503 hdr->source = new_port;
504 break;
505 case FLOW_OFFLOAD_DIR_REPLY:
506 port = hdr->dest;
507 new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_port;
508 hdr->dest = new_port;
509 break;
510 }
511
512 nf_flow_nat_port(skb, thoff, protocol, port, new_port);
513 }
514 EXPORT_SYMBOL_GPL(nf_flow_snat_port);
515
nf_flow_dnat_port(const struct flow_offload * flow,struct sk_buff * skb,unsigned int thoff,u8 protocol,enum flow_offload_tuple_dir dir)516 void nf_flow_dnat_port(const struct flow_offload *flow, struct sk_buff *skb,
517 unsigned int thoff, u8 protocol,
518 enum flow_offload_tuple_dir dir)
519 {
520 struct flow_ports *hdr;
521 __be16 port, new_port;
522
523 hdr = (void *)(skb_network_header(skb) + thoff);
524
525 switch (dir) {
526 case FLOW_OFFLOAD_DIR_ORIGINAL:
527 port = hdr->dest;
528 new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.src_port;
529 hdr->dest = new_port;
530 break;
531 case FLOW_OFFLOAD_DIR_REPLY:
532 port = hdr->source;
533 new_port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_port;
534 hdr->source = new_port;
535 break;
536 }
537
538 nf_flow_nat_port(skb, thoff, protocol, port, new_port);
539 }
540 EXPORT_SYMBOL_GPL(nf_flow_dnat_port);
541
nf_flow_table_init(struct nf_flowtable * flowtable)542 int nf_flow_table_init(struct nf_flowtable *flowtable)
543 {
544 int err;
545
546 INIT_DELAYED_WORK(&flowtable->gc_work, nf_flow_offload_work_gc);
547 flow_block_init(&flowtable->flow_block);
548 init_rwsem(&flowtable->flow_block_lock);
549
550 err = rhashtable_init(&flowtable->rhashtable,
551 &nf_flow_offload_rhash_params);
552 if (err < 0)
553 return err;
554
555 queue_delayed_work(system_power_efficient_wq,
556 &flowtable->gc_work, HZ);
557
558 mutex_lock(&flowtable_lock);
559 list_add(&flowtable->list, &flowtables);
560 mutex_unlock(&flowtable_lock);
561
562 return 0;
563 }
564 EXPORT_SYMBOL_GPL(nf_flow_table_init);
565
nf_flow_table_do_cleanup(struct nf_flowtable * flow_table,struct flow_offload * flow,void * data)566 static void nf_flow_table_do_cleanup(struct nf_flowtable *flow_table,
567 struct flow_offload *flow, void *data)
568 {
569 struct net_device *dev = data;
570
571 if (!dev) {
572 flow_offload_teardown(flow);
573 return;
574 }
575
576 if (net_eq(nf_ct_net(flow->ct), dev_net(dev)) &&
577 (flow->tuplehash[0].tuple.iifidx == dev->ifindex ||
578 flow->tuplehash[1].tuple.iifidx == dev->ifindex))
579 flow_offload_teardown(flow);
580 }
581
nf_flow_table_gc_cleanup(struct nf_flowtable * flowtable,struct net_device * dev)582 void nf_flow_table_gc_cleanup(struct nf_flowtable *flowtable,
583 struct net_device *dev)
584 {
585 nf_flow_table_iterate(flowtable, nf_flow_table_do_cleanup, dev);
586 flush_delayed_work(&flowtable->gc_work);
587 nf_flow_table_offload_flush(flowtable);
588 }
589
nf_flow_table_cleanup(struct net_device * dev)590 void nf_flow_table_cleanup(struct net_device *dev)
591 {
592 struct nf_flowtable *flowtable;
593
594 mutex_lock(&flowtable_lock);
595 list_for_each_entry(flowtable, &flowtables, list)
596 nf_flow_table_gc_cleanup(flowtable, dev);
597 mutex_unlock(&flowtable_lock);
598 }
599 EXPORT_SYMBOL_GPL(nf_flow_table_cleanup);
600
nf_flow_table_free(struct nf_flowtable * flow_table)601 void nf_flow_table_free(struct nf_flowtable *flow_table)
602 {
603 mutex_lock(&flowtable_lock);
604 list_del(&flow_table->list);
605 mutex_unlock(&flowtable_lock);
606
607 cancel_delayed_work_sync(&flow_table->gc_work);
608 nf_flow_table_offload_flush(flow_table);
609 /* ... no more pending work after this stage ... */
610 nf_flow_table_iterate(flow_table, nf_flow_table_do_cleanup, NULL);
611 nf_flow_table_gc_run(flow_table);
612 nf_flow_table_offload_flush_cleanup(flow_table);
613 rhashtable_destroy(&flow_table->rhashtable);
614 }
615 EXPORT_SYMBOL_GPL(nf_flow_table_free);
616
nf_flow_table_init_net(struct net * net)617 static int nf_flow_table_init_net(struct net *net)
618 {
619 net->ft.stat = alloc_percpu(struct nf_flow_table_stat);
620 return net->ft.stat ? 0 : -ENOMEM;
621 }
622
nf_flow_table_fini_net(struct net * net)623 static void nf_flow_table_fini_net(struct net *net)
624 {
625 free_percpu(net->ft.stat);
626 }
627
nf_flow_table_pernet_init(struct net * net)628 static int nf_flow_table_pernet_init(struct net *net)
629 {
630 int ret;
631
632 ret = nf_flow_table_init_net(net);
633 if (ret < 0)
634 return ret;
635
636 ret = nf_flow_table_init_proc(net);
637 if (ret < 0)
638 goto out_proc;
639
640 return 0;
641
642 out_proc:
643 nf_flow_table_fini_net(net);
644 return ret;
645 }
646
nf_flow_table_pernet_exit(struct list_head * net_exit_list)647 static void nf_flow_table_pernet_exit(struct list_head *net_exit_list)
648 {
649 struct net *net;
650
651 list_for_each_entry(net, net_exit_list, exit_list) {
652 nf_flow_table_fini_proc(net);
653 nf_flow_table_fini_net(net);
654 }
655 }
656
657 static struct pernet_operations nf_flow_table_net_ops = {
658 .init = nf_flow_table_pernet_init,
659 .exit_batch = nf_flow_table_pernet_exit,
660 };
661
nf_flow_table_module_init(void)662 static int __init nf_flow_table_module_init(void)
663 {
664 int ret;
665
666 ret = register_pernet_subsys(&nf_flow_table_net_ops);
667 if (ret < 0)
668 return ret;
669
670 ret = nf_flow_table_offload_init();
671 if (ret)
672 goto out_offload;
673
674 return 0;
675
676 out_offload:
677 unregister_pernet_subsys(&nf_flow_table_net_ops);
678 return ret;
679 }
680
nf_flow_table_module_exit(void)681 static void __exit nf_flow_table_module_exit(void)
682 {
683 nf_flow_table_offload_exit();
684 unregister_pernet_subsys(&nf_flow_table_net_ops);
685 }
686
687 module_init(nf_flow_table_module_init);
688 module_exit(nf_flow_table_module_exit);
689
690 MODULE_LICENSE("GPL");
691 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
692 MODULE_DESCRIPTION("Netfilter flow table module");
693