1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/security.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
32 #include <linux/siphash.h>
33
34 #include <linux/netfilter.h>
35 #include <net/netlink.h>
36 #include <net/sock.h>
37 #include <net/netfilter/nf_conntrack.h>
38 #include <net/netfilter/nf_conntrack_core.h>
39 #include <net/netfilter/nf_conntrack_expect.h>
40 #include <net/netfilter/nf_conntrack_helper.h>
41 #include <net/netfilter/nf_conntrack_seqadj.h>
42 #include <net/netfilter/nf_conntrack_l4proto.h>
43 #include <net/netfilter/nf_conntrack_tuple.h>
44 #include <net/netfilter/nf_conntrack_acct.h>
45 #include <net/netfilter/nf_conntrack_zones.h>
46 #include <net/netfilter/nf_conntrack_timestamp.h>
47 #include <net/netfilter/nf_conntrack_labels.h>
48 #include <net/netfilter/nf_conntrack_synproxy.h>
49 #if IS_ENABLED(CONFIG_NF_NAT)
50 #include <net/netfilter/nf_nat.h>
51 #include <net/netfilter/nf_nat_helper.h>
52 #endif
53
54 #include <linux/netfilter/nfnetlink.h>
55 #include <linux/netfilter/nfnetlink_conntrack.h>
56
57 #include "nf_internals.h"
58
59 MODULE_LICENSE("GPL");
60
61 struct ctnetlink_list_dump_ctx {
62 struct nf_conn *last;
63 unsigned int cpu;
64 bool done;
65 };
66
ctnetlink_dump_tuples_proto(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple,const struct nf_conntrack_l4proto * l4proto)67 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
68 const struct nf_conntrack_tuple *tuple,
69 const struct nf_conntrack_l4proto *l4proto)
70 {
71 int ret = 0;
72 struct nlattr *nest_parms;
73
74 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO);
75 if (!nest_parms)
76 goto nla_put_failure;
77 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
78 goto nla_put_failure;
79
80 if (likely(l4proto->tuple_to_nlattr))
81 ret = l4proto->tuple_to_nlattr(skb, tuple);
82
83 nla_nest_end(skb, nest_parms);
84
85 return ret;
86
87 nla_put_failure:
88 return -1;
89 }
90
ipv4_tuple_to_nlattr(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple)91 static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
92 const struct nf_conntrack_tuple *tuple)
93 {
94 if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
95 nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
96 return -EMSGSIZE;
97 return 0;
98 }
99
ipv6_tuple_to_nlattr(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple)100 static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
101 const struct nf_conntrack_tuple *tuple)
102 {
103 if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
104 nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
105 return -EMSGSIZE;
106 return 0;
107 }
108
ctnetlink_dump_tuples_ip(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple)109 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
110 const struct nf_conntrack_tuple *tuple)
111 {
112 int ret = 0;
113 struct nlattr *nest_parms;
114
115 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP);
116 if (!nest_parms)
117 goto nla_put_failure;
118
119 switch (tuple->src.l3num) {
120 case NFPROTO_IPV4:
121 ret = ipv4_tuple_to_nlattr(skb, tuple);
122 break;
123 case NFPROTO_IPV6:
124 ret = ipv6_tuple_to_nlattr(skb, tuple);
125 break;
126 }
127
128 nla_nest_end(skb, nest_parms);
129
130 return ret;
131
132 nla_put_failure:
133 return -1;
134 }
135
ctnetlink_dump_tuples(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple)136 static int ctnetlink_dump_tuples(struct sk_buff *skb,
137 const struct nf_conntrack_tuple *tuple)
138 {
139 const struct nf_conntrack_l4proto *l4proto;
140 int ret;
141
142 rcu_read_lock();
143 ret = ctnetlink_dump_tuples_ip(skb, tuple);
144
145 if (ret >= 0) {
146 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
147 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
148 }
149 rcu_read_unlock();
150 return ret;
151 }
152
ctnetlink_dump_zone_id(struct sk_buff * skb,int attrtype,const struct nf_conntrack_zone * zone,int dir)153 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
154 const struct nf_conntrack_zone *zone, int dir)
155 {
156 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
157 return 0;
158 if (nla_put_be16(skb, attrtype, htons(zone->id)))
159 goto nla_put_failure;
160 return 0;
161
162 nla_put_failure:
163 return -1;
164 }
165
ctnetlink_dump_status(struct sk_buff * skb,const struct nf_conn * ct)166 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
167 {
168 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
169 goto nla_put_failure;
170 return 0;
171
172 nla_put_failure:
173 return -1;
174 }
175
ctnetlink_dump_timeout(struct sk_buff * skb,const struct nf_conn * ct,bool skip_zero)176 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct,
177 bool skip_zero)
178 {
179 long timeout;
180
181 if (nf_ct_is_confirmed(ct))
182 timeout = nf_ct_expires(ct) / HZ;
183 else
184 timeout = ct->timeout / HZ;
185
186 if (skip_zero && timeout == 0)
187 return 0;
188
189 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
190 goto nla_put_failure;
191 return 0;
192
193 nla_put_failure:
194 return -1;
195 }
196
ctnetlink_dump_protoinfo(struct sk_buff * skb,struct nf_conn * ct,bool destroy)197 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct,
198 bool destroy)
199 {
200 const struct nf_conntrack_l4proto *l4proto;
201 struct nlattr *nest_proto;
202 int ret;
203
204 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
205 if (!l4proto->to_nlattr)
206 return 0;
207
208 nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
209 if (!nest_proto)
210 goto nla_put_failure;
211
212 ret = l4proto->to_nlattr(skb, nest_proto, ct, destroy);
213
214 nla_nest_end(skb, nest_proto);
215
216 return ret;
217
218 nla_put_failure:
219 return -1;
220 }
221
ctnetlink_dump_helpinfo(struct sk_buff * skb,const struct nf_conn * ct)222 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
223 const struct nf_conn *ct)
224 {
225 struct nlattr *nest_helper;
226 const struct nf_conn_help *help = nfct_help(ct);
227 struct nf_conntrack_helper *helper;
228
229 if (!help)
230 return 0;
231
232 rcu_read_lock();
233 helper = rcu_dereference(help->helper);
234 if (!helper)
235 goto out;
236
237 nest_helper = nla_nest_start(skb, CTA_HELP);
238 if (!nest_helper)
239 goto nla_put_failure;
240 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
241 goto nla_put_failure;
242
243 if (helper->to_nlattr)
244 helper->to_nlattr(skb, ct);
245
246 nla_nest_end(skb, nest_helper);
247 out:
248 rcu_read_unlock();
249 return 0;
250
251 nla_put_failure:
252 rcu_read_unlock();
253 return -1;
254 }
255
256 static int
dump_counters(struct sk_buff * skb,struct nf_conn_acct * acct,enum ip_conntrack_dir dir,int type)257 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
258 enum ip_conntrack_dir dir, int type)
259 {
260 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
261 struct nf_conn_counter *counter = acct->counter;
262 struct nlattr *nest_count;
263 u64 pkts, bytes;
264
265 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
266 pkts = atomic64_xchg(&counter[dir].packets, 0);
267 bytes = atomic64_xchg(&counter[dir].bytes, 0);
268 } else {
269 pkts = atomic64_read(&counter[dir].packets);
270 bytes = atomic64_read(&counter[dir].bytes);
271 }
272
273 nest_count = nla_nest_start(skb, attr);
274 if (!nest_count)
275 goto nla_put_failure;
276
277 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
278 CTA_COUNTERS_PAD) ||
279 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
280 CTA_COUNTERS_PAD))
281 goto nla_put_failure;
282
283 nla_nest_end(skb, nest_count);
284
285 return 0;
286
287 nla_put_failure:
288 return -1;
289 }
290
291 static int
ctnetlink_dump_acct(struct sk_buff * skb,const struct nf_conn * ct,int type)292 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
293 {
294 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
295
296 if (!acct)
297 return 0;
298
299 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
300 return -1;
301 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
302 return -1;
303
304 return 0;
305 }
306
307 static int
ctnetlink_dump_timestamp(struct sk_buff * skb,const struct nf_conn * ct)308 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
309 {
310 struct nlattr *nest_count;
311 const struct nf_conn_tstamp *tstamp;
312
313 tstamp = nf_conn_tstamp_find(ct);
314 if (!tstamp)
315 return 0;
316
317 nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
318 if (!nest_count)
319 goto nla_put_failure;
320
321 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
322 CTA_TIMESTAMP_PAD) ||
323 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
324 cpu_to_be64(tstamp->stop),
325 CTA_TIMESTAMP_PAD)))
326 goto nla_put_failure;
327 nla_nest_end(skb, nest_count);
328
329 return 0;
330
331 nla_put_failure:
332 return -1;
333 }
334
335 #ifdef CONFIG_NF_CONNTRACK_MARK
ctnetlink_dump_mark(struct sk_buff * skb,const struct nf_conn * ct,bool dump)336 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct,
337 bool dump)
338 {
339 u32 mark = READ_ONCE(ct->mark);
340
341 if (!mark && !dump)
342 return 0;
343
344 if (nla_put_be32(skb, CTA_MARK, htonl(mark)))
345 goto nla_put_failure;
346 return 0;
347
348 nla_put_failure:
349 return -1;
350 }
351 #else
352 #define ctnetlink_dump_mark(a, b, c) (0)
353 #endif
354
355 #ifdef CONFIG_NF_CONNTRACK_SECMARK
ctnetlink_dump_secctx(struct sk_buff * skb,const struct nf_conn * ct)356 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
357 {
358 struct nlattr *nest_secctx;
359 int len, ret;
360 char *secctx;
361
362 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
363 if (ret)
364 return 0;
365
366 ret = -1;
367 nest_secctx = nla_nest_start(skb, CTA_SECCTX);
368 if (!nest_secctx)
369 goto nla_put_failure;
370
371 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
372 goto nla_put_failure;
373 nla_nest_end(skb, nest_secctx);
374
375 ret = 0;
376 nla_put_failure:
377 security_release_secctx(secctx, len);
378 return ret;
379 }
380 #else
381 #define ctnetlink_dump_secctx(a, b) (0)
382 #endif
383
384 #ifdef CONFIG_NF_CONNTRACK_LABELS
ctnetlink_label_size(const struct nf_conn * ct)385 static inline int ctnetlink_label_size(const struct nf_conn *ct)
386 {
387 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
388
389 if (!labels)
390 return 0;
391 return nla_total_size(sizeof(labels->bits));
392 }
393
394 static int
ctnetlink_dump_labels(struct sk_buff * skb,const struct nf_conn * ct)395 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
396 {
397 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
398 unsigned int i;
399
400 if (!labels)
401 return 0;
402
403 i = 0;
404 do {
405 if (labels->bits[i] != 0)
406 return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
407 labels->bits);
408 i++;
409 } while (i < ARRAY_SIZE(labels->bits));
410
411 return 0;
412 }
413 #else
414 #define ctnetlink_dump_labels(a, b) (0)
415 #define ctnetlink_label_size(a) (0)
416 #endif
417
418 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
419
ctnetlink_dump_master(struct sk_buff * skb,const struct nf_conn * ct)420 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
421 {
422 struct nlattr *nest_parms;
423
424 if (!(ct->status & IPS_EXPECTED))
425 return 0;
426
427 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
428 if (!nest_parms)
429 goto nla_put_failure;
430 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
431 goto nla_put_failure;
432 nla_nest_end(skb, nest_parms);
433
434 return 0;
435
436 nla_put_failure:
437 return -1;
438 }
439
440 static int
dump_ct_seq_adj(struct sk_buff * skb,const struct nf_ct_seqadj * seq,int type)441 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
442 {
443 struct nlattr *nest_parms;
444
445 nest_parms = nla_nest_start(skb, type);
446 if (!nest_parms)
447 goto nla_put_failure;
448
449 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
450 htonl(seq->correction_pos)) ||
451 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
452 htonl(seq->offset_before)) ||
453 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
454 htonl(seq->offset_after)))
455 goto nla_put_failure;
456
457 nla_nest_end(skb, nest_parms);
458
459 return 0;
460
461 nla_put_failure:
462 return -1;
463 }
464
ctnetlink_dump_ct_seq_adj(struct sk_buff * skb,struct nf_conn * ct)465 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
466 {
467 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
468 struct nf_ct_seqadj *seq;
469
470 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
471 return 0;
472
473 spin_lock_bh(&ct->lock);
474 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
475 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
476 goto err;
477
478 seq = &seqadj->seq[IP_CT_DIR_REPLY];
479 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
480 goto err;
481
482 spin_unlock_bh(&ct->lock);
483 return 0;
484 err:
485 spin_unlock_bh(&ct->lock);
486 return -1;
487 }
488
ctnetlink_dump_ct_synproxy(struct sk_buff * skb,struct nf_conn * ct)489 static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
490 {
491 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
492 struct nlattr *nest_parms;
493
494 if (!synproxy)
495 return 0;
496
497 nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
498 if (!nest_parms)
499 goto nla_put_failure;
500
501 if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
502 nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
503 nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
504 goto nla_put_failure;
505
506 nla_nest_end(skb, nest_parms);
507
508 return 0;
509
510 nla_put_failure:
511 return -1;
512 }
513
ctnetlink_dump_id(struct sk_buff * skb,const struct nf_conn * ct)514 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
515 {
516 __be32 id = (__force __be32)nf_ct_get_id(ct);
517
518 if (nla_put_be32(skb, CTA_ID, id))
519 goto nla_put_failure;
520 return 0;
521
522 nla_put_failure:
523 return -1;
524 }
525
ctnetlink_dump_use(struct sk_buff * skb,const struct nf_conn * ct)526 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
527 {
528 if (nla_put_be32(skb, CTA_USE, htonl(refcount_read(&ct->ct_general.use))))
529 goto nla_put_failure;
530 return 0;
531
532 nla_put_failure:
533 return -1;
534 }
535
536 /* all these functions access ct->ext. Caller must either hold a reference
537 * on ct or prevent its deletion by holding either the bucket spinlock or
538 * pcpu dying list lock.
539 */
ctnetlink_dump_extinfo(struct sk_buff * skb,struct nf_conn * ct,u32 type)540 static int ctnetlink_dump_extinfo(struct sk_buff *skb,
541 struct nf_conn *ct, u32 type)
542 {
543 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
544 ctnetlink_dump_timestamp(skb, ct) < 0 ||
545 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
546 ctnetlink_dump_labels(skb, ct) < 0 ||
547 ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
548 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
549 return -1;
550
551 return 0;
552 }
553
ctnetlink_dump_info(struct sk_buff * skb,struct nf_conn * ct)554 static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
555 {
556 if (ctnetlink_dump_status(skb, ct) < 0 ||
557 ctnetlink_dump_mark(skb, ct, true) < 0 ||
558 ctnetlink_dump_secctx(skb, ct) < 0 ||
559 ctnetlink_dump_id(skb, ct) < 0 ||
560 ctnetlink_dump_use(skb, ct) < 0 ||
561 ctnetlink_dump_master(skb, ct) < 0)
562 return -1;
563
564 if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
565 (ctnetlink_dump_timeout(skb, ct, false) < 0 ||
566 ctnetlink_dump_protoinfo(skb, ct, false) < 0))
567 return -1;
568
569 return 0;
570 }
571
572 static int
ctnetlink_fill_info(struct sk_buff * skb,u32 portid,u32 seq,u32 type,struct nf_conn * ct,bool extinfo,unsigned int flags)573 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
574 struct nf_conn *ct, bool extinfo, unsigned int flags)
575 {
576 const struct nf_conntrack_zone *zone;
577 struct nlmsghdr *nlh;
578 struct nlattr *nest_parms;
579 unsigned int event;
580
581 if (portid)
582 flags |= NLM_F_MULTI;
583 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
584 nlh = nfnl_msg_put(skb, portid, seq, event, flags, nf_ct_l3num(ct),
585 NFNETLINK_V0, 0);
586 if (!nlh)
587 goto nlmsg_failure;
588
589 zone = nf_ct_zone(ct);
590
591 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
592 if (!nest_parms)
593 goto nla_put_failure;
594 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
595 goto nla_put_failure;
596 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
597 NF_CT_ZONE_DIR_ORIG) < 0)
598 goto nla_put_failure;
599 nla_nest_end(skb, nest_parms);
600
601 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
602 if (!nest_parms)
603 goto nla_put_failure;
604 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
605 goto nla_put_failure;
606 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
607 NF_CT_ZONE_DIR_REPL) < 0)
608 goto nla_put_failure;
609 nla_nest_end(skb, nest_parms);
610
611 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
612 NF_CT_DEFAULT_ZONE_DIR) < 0)
613 goto nla_put_failure;
614
615 if (ctnetlink_dump_info(skb, ct) < 0)
616 goto nla_put_failure;
617 if (extinfo && ctnetlink_dump_extinfo(skb, ct, type) < 0)
618 goto nla_put_failure;
619
620 nlmsg_end(skb, nlh);
621 return skb->len;
622
623 nlmsg_failure:
624 nla_put_failure:
625 nlmsg_cancel(skb, nlh);
626 return -1;
627 }
628
629 static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
630 [CTA_IP_V4_SRC] = { .type = NLA_U32 },
631 [CTA_IP_V4_DST] = { .type = NLA_U32 },
632 [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
633 [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
634 };
635
636 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
ctnetlink_proto_size(const struct nf_conn * ct)637 static size_t ctnetlink_proto_size(const struct nf_conn *ct)
638 {
639 const struct nf_conntrack_l4proto *l4proto;
640 size_t len, len4 = 0;
641
642 len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
643 len *= 3u; /* ORIG, REPLY, MASTER */
644
645 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
646 len += l4proto->nlattr_size;
647 if (l4proto->nlattr_tuple_size) {
648 len4 = l4proto->nlattr_tuple_size();
649 len4 *= 3u; /* ORIG, REPLY, MASTER */
650 }
651
652 return len + len4;
653 }
654 #endif
655
ctnetlink_acct_size(const struct nf_conn * ct)656 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
657 {
658 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
659 return 0;
660 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
661 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
662 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
663 ;
664 }
665
ctnetlink_secctx_size(const struct nf_conn * ct)666 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
667 {
668 #ifdef CONFIG_NF_CONNTRACK_SECMARK
669 int len, ret;
670
671 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
672 if (ret)
673 return 0;
674
675 return nla_total_size(0) /* CTA_SECCTX */
676 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
677 #else
678 return 0;
679 #endif
680 }
681
ctnetlink_timestamp_size(const struct nf_conn * ct)682 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
683 {
684 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
685 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
686 return 0;
687 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
688 #else
689 return 0;
690 #endif
691 }
692
693 #ifdef CONFIG_NF_CONNTRACK_EVENTS
ctnetlink_nlmsg_size(const struct nf_conn * ct)694 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
695 {
696 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
697 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
698 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
699 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
700 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
701 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
702 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
703 + ctnetlink_acct_size(ct)
704 + ctnetlink_timestamp_size(ct)
705 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
706 + nla_total_size(0) /* CTA_PROTOINFO */
707 + nla_total_size(0) /* CTA_HELP */
708 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
709 + ctnetlink_secctx_size(ct)
710 #if IS_ENABLED(CONFIG_NF_NAT)
711 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
712 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
713 #endif
714 #ifdef CONFIG_NF_CONNTRACK_MARK
715 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
716 #endif
717 #ifdef CONFIG_NF_CONNTRACK_ZONES
718 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
719 #endif
720 + ctnetlink_proto_size(ct)
721 + ctnetlink_label_size(ct)
722 ;
723 }
724
725 static int
ctnetlink_conntrack_event(unsigned int events,const struct nf_ct_event * item)726 ctnetlink_conntrack_event(unsigned int events, const struct nf_ct_event *item)
727 {
728 const struct nf_conntrack_zone *zone;
729 struct net *net;
730 struct nlmsghdr *nlh;
731 struct nlattr *nest_parms;
732 struct nf_conn *ct = item->ct;
733 struct sk_buff *skb;
734 unsigned int type;
735 unsigned int flags = 0, group;
736 int err;
737
738 if (events & (1 << IPCT_DESTROY)) {
739 type = IPCTNL_MSG_CT_DELETE;
740 group = NFNLGRP_CONNTRACK_DESTROY;
741 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
742 type = IPCTNL_MSG_CT_NEW;
743 flags = NLM_F_CREATE|NLM_F_EXCL;
744 group = NFNLGRP_CONNTRACK_NEW;
745 } else if (events) {
746 type = IPCTNL_MSG_CT_NEW;
747 group = NFNLGRP_CONNTRACK_UPDATE;
748 } else
749 return 0;
750
751 net = nf_ct_net(ct);
752 if (!item->report && !nfnetlink_has_listeners(net, group))
753 return 0;
754
755 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
756 if (skb == NULL)
757 goto errout;
758
759 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
760 nlh = nfnl_msg_put(skb, item->portid, 0, type, flags, nf_ct_l3num(ct),
761 NFNETLINK_V0, 0);
762 if (!nlh)
763 goto nlmsg_failure;
764
765 zone = nf_ct_zone(ct);
766
767 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
768 if (!nest_parms)
769 goto nla_put_failure;
770 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
771 goto nla_put_failure;
772 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
773 NF_CT_ZONE_DIR_ORIG) < 0)
774 goto nla_put_failure;
775 nla_nest_end(skb, nest_parms);
776
777 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
778 if (!nest_parms)
779 goto nla_put_failure;
780 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
781 goto nla_put_failure;
782 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
783 NF_CT_ZONE_DIR_REPL) < 0)
784 goto nla_put_failure;
785 nla_nest_end(skb, nest_parms);
786
787 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
788 NF_CT_DEFAULT_ZONE_DIR) < 0)
789 goto nla_put_failure;
790
791 if (ctnetlink_dump_id(skb, ct) < 0)
792 goto nla_put_failure;
793
794 if (ctnetlink_dump_status(skb, ct) < 0)
795 goto nla_put_failure;
796
797 if (events & (1 << IPCT_DESTROY)) {
798 if (ctnetlink_dump_timeout(skb, ct, true) < 0)
799 goto nla_put_failure;
800
801 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
802 ctnetlink_dump_timestamp(skb, ct) < 0 ||
803 ctnetlink_dump_protoinfo(skb, ct, true) < 0)
804 goto nla_put_failure;
805 } else {
806 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
807 goto nla_put_failure;
808
809 if (events & (1 << IPCT_PROTOINFO) &&
810 ctnetlink_dump_protoinfo(skb, ct, false) < 0)
811 goto nla_put_failure;
812
813 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
814 && ctnetlink_dump_helpinfo(skb, ct) < 0)
815 goto nla_put_failure;
816
817 #ifdef CONFIG_NF_CONNTRACK_SECMARK
818 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
819 && ctnetlink_dump_secctx(skb, ct) < 0)
820 goto nla_put_failure;
821 #endif
822 if (events & (1 << IPCT_LABEL) &&
823 ctnetlink_dump_labels(skb, ct) < 0)
824 goto nla_put_failure;
825
826 if (events & (1 << IPCT_RELATED) &&
827 ctnetlink_dump_master(skb, ct) < 0)
828 goto nla_put_failure;
829
830 if (events & (1 << IPCT_SEQADJ) &&
831 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
832 goto nla_put_failure;
833
834 if (events & (1 << IPCT_SYNPROXY) &&
835 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
836 goto nla_put_failure;
837 }
838
839 #ifdef CONFIG_NF_CONNTRACK_MARK
840 if (ctnetlink_dump_mark(skb, ct, events & (1 << IPCT_MARK)))
841 goto nla_put_failure;
842 #endif
843 nlmsg_end(skb, nlh);
844 err = nfnetlink_send(skb, net, item->portid, group, item->report,
845 GFP_ATOMIC);
846 if (err == -ENOBUFS || err == -EAGAIN)
847 return -ENOBUFS;
848
849 return 0;
850
851 nla_put_failure:
852 nlmsg_cancel(skb, nlh);
853 nlmsg_failure:
854 kfree_skb(skb);
855 errout:
856 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
857 return -ENOBUFS;
858
859 return 0;
860 }
861 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
862
ctnetlink_done(struct netlink_callback * cb)863 static int ctnetlink_done(struct netlink_callback *cb)
864 {
865 if (cb->args[1])
866 nf_ct_put((struct nf_conn *)cb->args[1]);
867 kfree(cb->data);
868 return 0;
869 }
870
871 struct ctnetlink_filter_u32 {
872 u32 val;
873 u32 mask;
874 };
875
876 struct ctnetlink_filter {
877 u8 family;
878
879 u_int32_t orig_flags;
880 u_int32_t reply_flags;
881
882 struct nf_conntrack_tuple orig;
883 struct nf_conntrack_tuple reply;
884 struct nf_conntrack_zone zone;
885
886 struct ctnetlink_filter_u32 mark;
887 struct ctnetlink_filter_u32 status;
888 };
889
890 static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
891 [CTA_FILTER_ORIG_FLAGS] = { .type = NLA_U32 },
892 [CTA_FILTER_REPLY_FLAGS] = { .type = NLA_U32 },
893 };
894
ctnetlink_parse_filter(const struct nlattr * attr,struct ctnetlink_filter * filter)895 static int ctnetlink_parse_filter(const struct nlattr *attr,
896 struct ctnetlink_filter *filter)
897 {
898 struct nlattr *tb[CTA_FILTER_MAX + 1];
899 int ret = 0;
900
901 ret = nla_parse_nested(tb, CTA_FILTER_MAX, attr, cta_filter_nla_policy,
902 NULL);
903 if (ret)
904 return ret;
905
906 if (tb[CTA_FILTER_ORIG_FLAGS]) {
907 filter->orig_flags = nla_get_u32(tb[CTA_FILTER_ORIG_FLAGS]);
908 if (filter->orig_flags & ~CTA_FILTER_F_ALL)
909 return -EOPNOTSUPP;
910 }
911
912 if (tb[CTA_FILTER_REPLY_FLAGS]) {
913 filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
914 if (filter->reply_flags & ~CTA_FILTER_F_ALL)
915 return -EOPNOTSUPP;
916 }
917
918 return 0;
919 }
920
921 static int ctnetlink_parse_zone(const struct nlattr *attr,
922 struct nf_conntrack_zone *zone);
923 static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
924 struct nf_conntrack_tuple *tuple,
925 u32 type, u_int8_t l3num,
926 struct nf_conntrack_zone *zone,
927 u_int32_t flags);
928
ctnetlink_filter_parse_mark(struct ctnetlink_filter_u32 * mark,const struct nlattr * const cda[])929 static int ctnetlink_filter_parse_mark(struct ctnetlink_filter_u32 *mark,
930 const struct nlattr * const cda[])
931 {
932 #ifdef CONFIG_NF_CONNTRACK_MARK
933 if (cda[CTA_MARK]) {
934 mark->val = ntohl(nla_get_be32(cda[CTA_MARK]));
935
936 if (cda[CTA_MARK_MASK])
937 mark->mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
938 else
939 mark->mask = 0xffffffff;
940 } else if (cda[CTA_MARK_MASK]) {
941 return -EINVAL;
942 }
943 #endif
944 return 0;
945 }
946
ctnetlink_filter_parse_status(struct ctnetlink_filter_u32 * status,const struct nlattr * const cda[])947 static int ctnetlink_filter_parse_status(struct ctnetlink_filter_u32 *status,
948 const struct nlattr * const cda[])
949 {
950 if (cda[CTA_STATUS]) {
951 status->val = ntohl(nla_get_be32(cda[CTA_STATUS]));
952 if (cda[CTA_STATUS_MASK])
953 status->mask = ntohl(nla_get_be32(cda[CTA_STATUS_MASK]));
954 else
955 status->mask = status->val;
956
957 /* status->val == 0? always true, else always false. */
958 if (status->mask == 0)
959 return -EINVAL;
960 } else if (cda[CTA_STATUS_MASK]) {
961 return -EINVAL;
962 }
963
964 /* CTA_STATUS is NLA_U32, if this fires UAPI needs to be extended */
965 BUILD_BUG_ON(__IPS_MAX_BIT >= 32);
966 return 0;
967 }
968
969 static struct ctnetlink_filter *
ctnetlink_alloc_filter(const struct nlattr * const cda[],u8 family)970 ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
971 {
972 struct ctnetlink_filter *filter;
973 int err;
974
975 #ifndef CONFIG_NF_CONNTRACK_MARK
976 if (cda[CTA_MARK] || cda[CTA_MARK_MASK])
977 return ERR_PTR(-EOPNOTSUPP);
978 #endif
979
980 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
981 if (filter == NULL)
982 return ERR_PTR(-ENOMEM);
983
984 filter->family = family;
985
986 err = ctnetlink_filter_parse_mark(&filter->mark, cda);
987 if (err)
988 goto err_filter;
989
990 err = ctnetlink_filter_parse_status(&filter->status, cda);
991 if (err)
992 goto err_filter;
993
994 if (!cda[CTA_FILTER])
995 return filter;
996
997 err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
998 if (err < 0)
999 goto err_filter;
1000
1001 err = ctnetlink_parse_filter(cda[CTA_FILTER], filter);
1002 if (err < 0)
1003 goto err_filter;
1004
1005 if (filter->orig_flags) {
1006 if (!cda[CTA_TUPLE_ORIG]) {
1007 err = -EINVAL;
1008 goto err_filter;
1009 }
1010
1011 err = ctnetlink_parse_tuple_filter(cda, &filter->orig,
1012 CTA_TUPLE_ORIG,
1013 filter->family,
1014 &filter->zone,
1015 filter->orig_flags);
1016 if (err < 0)
1017 goto err_filter;
1018 }
1019
1020 if (filter->reply_flags) {
1021 if (!cda[CTA_TUPLE_REPLY]) {
1022 err = -EINVAL;
1023 goto err_filter;
1024 }
1025
1026 err = ctnetlink_parse_tuple_filter(cda, &filter->reply,
1027 CTA_TUPLE_REPLY,
1028 filter->family,
1029 &filter->zone,
1030 filter->reply_flags);
1031 if (err < 0)
1032 goto err_filter;
1033 }
1034
1035 return filter;
1036
1037 err_filter:
1038 kfree(filter);
1039
1040 return ERR_PTR(err);
1041 }
1042
ctnetlink_needs_filter(u8 family,const struct nlattr * const * cda)1043 static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
1044 {
1045 return family || cda[CTA_MARK] || cda[CTA_FILTER] || cda[CTA_STATUS];
1046 }
1047
ctnetlink_start(struct netlink_callback * cb)1048 static int ctnetlink_start(struct netlink_callback *cb)
1049 {
1050 const struct nlattr * const *cda = cb->data;
1051 struct ctnetlink_filter *filter = NULL;
1052 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1053 u8 family = nfmsg->nfgen_family;
1054
1055 if (ctnetlink_needs_filter(family, cda)) {
1056 filter = ctnetlink_alloc_filter(cda, family);
1057 if (IS_ERR(filter))
1058 return PTR_ERR(filter);
1059 }
1060
1061 cb->data = filter;
1062 return 0;
1063 }
1064
ctnetlink_filter_match_tuple(struct nf_conntrack_tuple * filter_tuple,struct nf_conntrack_tuple * ct_tuple,u_int32_t flags,int family)1065 static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
1066 struct nf_conntrack_tuple *ct_tuple,
1067 u_int32_t flags, int family)
1068 {
1069 switch (family) {
1070 case NFPROTO_IPV4:
1071 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1072 filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
1073 return 0;
1074
1075 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1076 filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
1077 return 0;
1078 break;
1079 case NFPROTO_IPV6:
1080 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1081 !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
1082 &ct_tuple->src.u3.in6))
1083 return 0;
1084
1085 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1086 !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
1087 &ct_tuple->dst.u3.in6))
1088 return 0;
1089 break;
1090 }
1091
1092 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
1093 filter_tuple->dst.protonum != ct_tuple->dst.protonum)
1094 return 0;
1095
1096 switch (ct_tuple->dst.protonum) {
1097 case IPPROTO_TCP:
1098 case IPPROTO_UDP:
1099 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
1100 filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
1101 return 0;
1102
1103 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
1104 filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
1105 return 0;
1106 break;
1107 case IPPROTO_ICMP:
1108 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
1109 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1110 return 0;
1111 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
1112 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1113 return 0;
1114 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
1115 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1116 return 0;
1117 break;
1118 case IPPROTO_ICMPV6:
1119 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
1120 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1121 return 0;
1122 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
1123 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1124 return 0;
1125 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
1126 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1127 return 0;
1128 break;
1129 }
1130
1131 return 1;
1132 }
1133
ctnetlink_filter_match(struct nf_conn * ct,void * data)1134 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
1135 {
1136 struct ctnetlink_filter *filter = data;
1137 struct nf_conntrack_tuple *tuple;
1138 u32 status;
1139
1140 if (filter == NULL)
1141 goto out;
1142
1143 /* Match entries of a given L3 protocol number.
1144 * If it is not specified, ie. l3proto == 0,
1145 * then match everything.
1146 */
1147 if (filter->family && nf_ct_l3num(ct) != filter->family)
1148 goto ignore_entry;
1149
1150 if (filter->orig_flags) {
1151 tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
1152 if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
1153 filter->orig_flags,
1154 filter->family))
1155 goto ignore_entry;
1156 }
1157
1158 if (filter->reply_flags) {
1159 tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
1160 if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
1161 filter->reply_flags,
1162 filter->family))
1163 goto ignore_entry;
1164 }
1165
1166 #ifdef CONFIG_NF_CONNTRACK_MARK
1167 if ((READ_ONCE(ct->mark) & filter->mark.mask) != filter->mark.val)
1168 goto ignore_entry;
1169 #endif
1170 status = (u32)READ_ONCE(ct->status);
1171 if ((status & filter->status.mask) != filter->status.val)
1172 goto ignore_entry;
1173
1174 out:
1175 return 1;
1176
1177 ignore_entry:
1178 return 0;
1179 }
1180
1181 static int
ctnetlink_dump_table(struct sk_buff * skb,struct netlink_callback * cb)1182 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1183 {
1184 unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
1185 struct net *net = sock_net(skb->sk);
1186 struct nf_conn *ct, *last;
1187 struct nf_conntrack_tuple_hash *h;
1188 struct hlist_nulls_node *n;
1189 struct nf_conn *nf_ct_evict[8];
1190 int res, i;
1191 spinlock_t *lockp;
1192
1193 last = (struct nf_conn *)cb->args[1];
1194 i = 0;
1195
1196 local_bh_disable();
1197 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
1198 restart:
1199 while (i) {
1200 i--;
1201 if (nf_ct_should_gc(nf_ct_evict[i]))
1202 nf_ct_kill(nf_ct_evict[i]);
1203 nf_ct_put(nf_ct_evict[i]);
1204 }
1205
1206 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
1207 nf_conntrack_lock(lockp);
1208 if (cb->args[0] >= nf_conntrack_htable_size) {
1209 spin_unlock(lockp);
1210 goto out;
1211 }
1212 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
1213 hnnode) {
1214 ct = nf_ct_tuplehash_to_ctrack(h);
1215 if (nf_ct_is_expired(ct)) {
1216 /* need to defer nf_ct_kill() until lock is released */
1217 if (i < ARRAY_SIZE(nf_ct_evict) &&
1218 refcount_inc_not_zero(&ct->ct_general.use))
1219 nf_ct_evict[i++] = ct;
1220 continue;
1221 }
1222
1223 if (!net_eq(net, nf_ct_net(ct)))
1224 continue;
1225
1226 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
1227 continue;
1228
1229 if (cb->args[1]) {
1230 if (ct != last)
1231 continue;
1232 cb->args[1] = 0;
1233 }
1234 if (!ctnetlink_filter_match(ct, cb->data))
1235 continue;
1236
1237 res =
1238 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1239 cb->nlh->nlmsg_seq,
1240 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1241 ct, true, flags);
1242 if (res < 0) {
1243 nf_conntrack_get(&ct->ct_general);
1244 cb->args[1] = (unsigned long)ct;
1245 spin_unlock(lockp);
1246 goto out;
1247 }
1248 }
1249 spin_unlock(lockp);
1250 if (cb->args[1]) {
1251 cb->args[1] = 0;
1252 goto restart;
1253 }
1254 }
1255 out:
1256 local_bh_enable();
1257 if (last) {
1258 /* nf ct hash resize happened, now clear the leftover. */
1259 if ((struct nf_conn *)cb->args[1] == last)
1260 cb->args[1] = 0;
1261
1262 nf_ct_put(last);
1263 }
1264
1265 while (i) {
1266 i--;
1267 if (nf_ct_should_gc(nf_ct_evict[i]))
1268 nf_ct_kill(nf_ct_evict[i]);
1269 nf_ct_put(nf_ct_evict[i]);
1270 }
1271
1272 return skb->len;
1273 }
1274
ipv4_nlattr_to_tuple(struct nlattr * tb[],struct nf_conntrack_tuple * t,u_int32_t flags)1275 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
1276 struct nf_conntrack_tuple *t,
1277 u_int32_t flags)
1278 {
1279 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1280 if (!tb[CTA_IP_V4_SRC])
1281 return -EINVAL;
1282
1283 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1284 }
1285
1286 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1287 if (!tb[CTA_IP_V4_DST])
1288 return -EINVAL;
1289
1290 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1291 }
1292
1293 return 0;
1294 }
1295
ipv6_nlattr_to_tuple(struct nlattr * tb[],struct nf_conntrack_tuple * t,u_int32_t flags)1296 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1297 struct nf_conntrack_tuple *t,
1298 u_int32_t flags)
1299 {
1300 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1301 if (!tb[CTA_IP_V6_SRC])
1302 return -EINVAL;
1303
1304 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1305 }
1306
1307 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1308 if (!tb[CTA_IP_V6_DST])
1309 return -EINVAL;
1310
1311 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1312 }
1313
1314 return 0;
1315 }
1316
ctnetlink_parse_tuple_ip(struct nlattr * attr,struct nf_conntrack_tuple * tuple,u_int32_t flags)1317 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1318 struct nf_conntrack_tuple *tuple,
1319 u_int32_t flags)
1320 {
1321 struct nlattr *tb[CTA_IP_MAX+1];
1322 int ret = 0;
1323
1324 ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr,
1325 cta_ip_nla_policy, NULL);
1326 if (ret < 0)
1327 return ret;
1328
1329 switch (tuple->src.l3num) {
1330 case NFPROTO_IPV4:
1331 ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
1332 break;
1333 case NFPROTO_IPV6:
1334 ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
1335 break;
1336 }
1337
1338 return ret;
1339 }
1340
1341 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1342 [CTA_PROTO_NUM] = { .type = NLA_U8 },
1343 };
1344
ctnetlink_parse_tuple_proto(struct nlattr * attr,struct nf_conntrack_tuple * tuple,u_int32_t flags)1345 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1346 struct nf_conntrack_tuple *tuple,
1347 u_int32_t flags)
1348 {
1349 const struct nf_conntrack_l4proto *l4proto;
1350 struct nlattr *tb[CTA_PROTO_MAX+1];
1351 int ret = 0;
1352
1353 ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1354 proto_nla_policy, NULL);
1355 if (ret < 0)
1356 return ret;
1357
1358 if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
1359 return 0;
1360
1361 if (!tb[CTA_PROTO_NUM])
1362 return -EINVAL;
1363
1364 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1365
1366 rcu_read_lock();
1367 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1368
1369 if (likely(l4proto->nlattr_to_tuple)) {
1370 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1371 l4proto->nla_policy,
1372 NULL);
1373 if (ret == 0)
1374 ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
1375 }
1376
1377 rcu_read_unlock();
1378
1379 return ret;
1380 }
1381
1382 static int
ctnetlink_parse_zone(const struct nlattr * attr,struct nf_conntrack_zone * zone)1383 ctnetlink_parse_zone(const struct nlattr *attr,
1384 struct nf_conntrack_zone *zone)
1385 {
1386 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1387 NF_CT_DEFAULT_ZONE_DIR, 0);
1388 #ifdef CONFIG_NF_CONNTRACK_ZONES
1389 if (attr)
1390 zone->id = ntohs(nla_get_be16(attr));
1391 #else
1392 if (attr)
1393 return -EOPNOTSUPP;
1394 #endif
1395 return 0;
1396 }
1397
1398 static int
ctnetlink_parse_tuple_zone(struct nlattr * attr,enum ctattr_type type,struct nf_conntrack_zone * zone)1399 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1400 struct nf_conntrack_zone *zone)
1401 {
1402 int ret;
1403
1404 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1405 return -EINVAL;
1406
1407 ret = ctnetlink_parse_zone(attr, zone);
1408 if (ret < 0)
1409 return ret;
1410
1411 if (type == CTA_TUPLE_REPLY)
1412 zone->dir = NF_CT_ZONE_DIR_REPL;
1413 else
1414 zone->dir = NF_CT_ZONE_DIR_ORIG;
1415
1416 return 0;
1417 }
1418
1419 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1420 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1421 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1422 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1423 };
1424
1425 #define CTA_FILTER_F_ALL_CTA_PROTO \
1426 (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
1427 CTA_FILTER_F_CTA_PROTO_DST_PORT | \
1428 CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
1429 CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
1430 CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
1431 CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
1432 CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
1433 CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
1434
1435 static int
ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],struct nf_conntrack_tuple * tuple,u32 type,u_int8_t l3num,struct nf_conntrack_zone * zone,u_int32_t flags)1436 ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
1437 struct nf_conntrack_tuple *tuple, u32 type,
1438 u_int8_t l3num, struct nf_conntrack_zone *zone,
1439 u_int32_t flags)
1440 {
1441 struct nlattr *tb[CTA_TUPLE_MAX+1];
1442 int err;
1443
1444 memset(tuple, 0, sizeof(*tuple));
1445
1446 err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1447 tuple_nla_policy, NULL);
1448 if (err < 0)
1449 return err;
1450
1451 if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1452 return -EOPNOTSUPP;
1453 tuple->src.l3num = l3num;
1454
1455 if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
1456 flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1457 if (!tb[CTA_TUPLE_IP])
1458 return -EINVAL;
1459
1460 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
1461 if (err < 0)
1462 return err;
1463 }
1464
1465 if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
1466 if (!tb[CTA_TUPLE_PROTO])
1467 return -EINVAL;
1468
1469 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
1470 if (err < 0)
1471 return err;
1472 } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
1473 /* Can't manage proto flags without a protonum */
1474 return -EINVAL;
1475 }
1476
1477 if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
1478 if (!zone)
1479 return -EINVAL;
1480
1481 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1482 type, zone);
1483 if (err < 0)
1484 return err;
1485 }
1486
1487 /* orig and expect tuples get DIR_ORIGINAL */
1488 if (type == CTA_TUPLE_REPLY)
1489 tuple->dst.dir = IP_CT_DIR_REPLY;
1490 else
1491 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1492
1493 return 0;
1494 }
1495
1496 static int
ctnetlink_parse_tuple(const struct nlattr * const cda[],struct nf_conntrack_tuple * tuple,u32 type,u_int8_t l3num,struct nf_conntrack_zone * zone)1497 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1498 struct nf_conntrack_tuple *tuple, u32 type,
1499 u_int8_t l3num, struct nf_conntrack_zone *zone)
1500 {
1501 return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
1502 CTA_FILTER_FLAG(ALL));
1503 }
1504
1505 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1506 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1507 .len = NF_CT_HELPER_NAME_LEN - 1 },
1508 };
1509
ctnetlink_parse_help(const struct nlattr * attr,char ** helper_name,struct nlattr ** helpinfo)1510 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1511 struct nlattr **helpinfo)
1512 {
1513 int err;
1514 struct nlattr *tb[CTA_HELP_MAX+1];
1515
1516 err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1517 help_nla_policy, NULL);
1518 if (err < 0)
1519 return err;
1520
1521 if (!tb[CTA_HELP_NAME])
1522 return -EINVAL;
1523
1524 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1525
1526 if (tb[CTA_HELP_INFO])
1527 *helpinfo = tb[CTA_HELP_INFO];
1528
1529 return 0;
1530 }
1531
1532 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1533 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1534 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1535 [CTA_STATUS] = { .type = NLA_U32 },
1536 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1537 [CTA_HELP] = { .type = NLA_NESTED },
1538 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1539 [CTA_TIMEOUT] = { .type = NLA_U32 },
1540 [CTA_MARK] = { .type = NLA_U32 },
1541 [CTA_ID] = { .type = NLA_U32 },
1542 [CTA_NAT_DST] = { .type = NLA_NESTED },
1543 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1544 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1545 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1546 [CTA_ZONE] = { .type = NLA_U16 },
1547 [CTA_MARK_MASK] = { .type = NLA_U32 },
1548 [CTA_LABELS] = { .type = NLA_BINARY,
1549 .len = NF_CT_LABELS_MAX_SIZE },
1550 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1551 .len = NF_CT_LABELS_MAX_SIZE },
1552 [CTA_FILTER] = { .type = NLA_NESTED },
1553 [CTA_STATUS_MASK] = { .type = NLA_U32 },
1554 };
1555
ctnetlink_flush_iterate(struct nf_conn * ct,void * data)1556 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1557 {
1558 return ctnetlink_filter_match(ct, data);
1559 }
1560
ctnetlink_flush_conntrack(struct net * net,const struct nlattr * const cda[],u32 portid,int report,u8 family)1561 static int ctnetlink_flush_conntrack(struct net *net,
1562 const struct nlattr * const cda[],
1563 u32 portid, int report, u8 family)
1564 {
1565 struct ctnetlink_filter *filter = NULL;
1566 struct nf_ct_iter_data iter = {
1567 .net = net,
1568 .portid = portid,
1569 .report = report,
1570 };
1571
1572 if (ctnetlink_needs_filter(family, cda)) {
1573 if (cda[CTA_FILTER])
1574 return -EOPNOTSUPP;
1575
1576 filter = ctnetlink_alloc_filter(cda, family);
1577 if (IS_ERR(filter))
1578 return PTR_ERR(filter);
1579
1580 iter.data = filter;
1581 }
1582
1583 nf_ct_iterate_cleanup_net(ctnetlink_flush_iterate, &iter);
1584 kfree(filter);
1585
1586 return 0;
1587 }
1588
ctnetlink_del_conntrack(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])1589 static int ctnetlink_del_conntrack(struct sk_buff *skb,
1590 const struct nfnl_info *info,
1591 const struct nlattr * const cda[])
1592 {
1593 u8 family = info->nfmsg->nfgen_family;
1594 struct nf_conntrack_tuple_hash *h;
1595 struct nf_conntrack_tuple tuple;
1596 struct nf_conntrack_zone zone;
1597 struct nf_conn *ct;
1598 int err;
1599
1600 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1601 if (err < 0)
1602 return err;
1603
1604 if (cda[CTA_TUPLE_ORIG])
1605 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1606 family, &zone);
1607 else if (cda[CTA_TUPLE_REPLY])
1608 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1609 family, &zone);
1610 else {
1611 u_int8_t u3 = info->nfmsg->version ? family : AF_UNSPEC;
1612
1613 return ctnetlink_flush_conntrack(info->net, cda,
1614 NETLINK_CB(skb).portid,
1615 nlmsg_report(info->nlh), u3);
1616 }
1617
1618 if (err < 0)
1619 return err;
1620
1621 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1622 if (!h)
1623 return -ENOENT;
1624
1625 ct = nf_ct_tuplehash_to_ctrack(h);
1626
1627 if (cda[CTA_ID]) {
1628 __be32 id = nla_get_be32(cda[CTA_ID]);
1629
1630 if (id != (__force __be32)nf_ct_get_id(ct)) {
1631 nf_ct_put(ct);
1632 return -ENOENT;
1633 }
1634 }
1635
1636 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(info->nlh));
1637 nf_ct_put(ct);
1638
1639 return 0;
1640 }
1641
ctnetlink_get_conntrack(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])1642 static int ctnetlink_get_conntrack(struct sk_buff *skb,
1643 const struct nfnl_info *info,
1644 const struct nlattr * const cda[])
1645 {
1646 u_int8_t u3 = info->nfmsg->nfgen_family;
1647 struct nf_conntrack_tuple_hash *h;
1648 struct nf_conntrack_tuple tuple;
1649 struct nf_conntrack_zone zone;
1650 struct sk_buff *skb2;
1651 struct nf_conn *ct;
1652 int err;
1653
1654 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1655 struct netlink_dump_control c = {
1656 .start = ctnetlink_start,
1657 .dump = ctnetlink_dump_table,
1658 .done = ctnetlink_done,
1659 .data = (void *)cda,
1660 };
1661
1662 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1663 }
1664
1665 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1666 if (err < 0)
1667 return err;
1668
1669 if (cda[CTA_TUPLE_ORIG])
1670 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1671 u3, &zone);
1672 else if (cda[CTA_TUPLE_REPLY])
1673 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1674 u3, &zone);
1675 else
1676 return -EINVAL;
1677
1678 if (err < 0)
1679 return err;
1680
1681 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1682 if (!h)
1683 return -ENOENT;
1684
1685 ct = nf_ct_tuplehash_to_ctrack(h);
1686
1687 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1688 if (!skb2) {
1689 nf_ct_put(ct);
1690 return -ENOMEM;
1691 }
1692
1693 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid,
1694 info->nlh->nlmsg_seq,
1695 NFNL_MSG_TYPE(info->nlh->nlmsg_type), ct,
1696 true, 0);
1697 nf_ct_put(ct);
1698 if (err <= 0) {
1699 kfree_skb(skb2);
1700 return -ENOMEM;
1701 }
1702
1703 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
1704 }
1705
ctnetlink_done_list(struct netlink_callback * cb)1706 static int ctnetlink_done_list(struct netlink_callback *cb)
1707 {
1708 struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
1709
1710 if (ctx->last)
1711 nf_ct_put(ctx->last);
1712
1713 return 0;
1714 }
1715
1716 #ifdef CONFIG_NF_CONNTRACK_EVENTS
ctnetlink_dump_one_entry(struct sk_buff * skb,struct netlink_callback * cb,struct nf_conn * ct,bool dying)1717 static int ctnetlink_dump_one_entry(struct sk_buff *skb,
1718 struct netlink_callback *cb,
1719 struct nf_conn *ct,
1720 bool dying)
1721 {
1722 struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
1723 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1724 u8 l3proto = nfmsg->nfgen_family;
1725 int res;
1726
1727 if (l3proto && nf_ct_l3num(ct) != l3proto)
1728 return 0;
1729
1730 if (ctx->last) {
1731 if (ct != ctx->last)
1732 return 0;
1733
1734 ctx->last = NULL;
1735 }
1736
1737 /* We can't dump extension info for the unconfirmed
1738 * list because unconfirmed conntracks can have
1739 * ct->ext reallocated (and thus freed).
1740 *
1741 * In the dying list case ct->ext can't be free'd
1742 * until after we drop pcpu->lock.
1743 */
1744 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1745 cb->nlh->nlmsg_seq,
1746 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1747 ct, dying, 0);
1748 if (res < 0) {
1749 if (!refcount_inc_not_zero(&ct->ct_general.use))
1750 return 0;
1751
1752 ctx->last = ct;
1753 }
1754
1755 return res;
1756 }
1757 #endif
1758
1759 static int
ctnetlink_dump_unconfirmed(struct sk_buff * skb,struct netlink_callback * cb)1760 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1761 {
1762 return 0;
1763 }
1764
1765 static int
ctnetlink_dump_dying(struct sk_buff * skb,struct netlink_callback * cb)1766 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1767 {
1768 struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
1769 struct nf_conn *last = ctx->last;
1770 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1771 const struct net *net = sock_net(skb->sk);
1772 struct nf_conntrack_net_ecache *ecache_net;
1773 struct nf_conntrack_tuple_hash *h;
1774 struct hlist_nulls_node *n;
1775 #endif
1776
1777 if (ctx->done)
1778 return 0;
1779
1780 ctx->last = NULL;
1781
1782 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1783 ecache_net = nf_conn_pernet_ecache(net);
1784 spin_lock_bh(&ecache_net->dying_lock);
1785
1786 hlist_nulls_for_each_entry(h, n, &ecache_net->dying_list, hnnode) {
1787 struct nf_conn *ct;
1788 int res;
1789
1790 ct = nf_ct_tuplehash_to_ctrack(h);
1791 if (last && last != ct)
1792 continue;
1793
1794 res = ctnetlink_dump_one_entry(skb, cb, ct, true);
1795 if (res < 0) {
1796 spin_unlock_bh(&ecache_net->dying_lock);
1797 nf_ct_put(last);
1798 return skb->len;
1799 }
1800
1801 nf_ct_put(last);
1802 last = NULL;
1803 }
1804
1805 spin_unlock_bh(&ecache_net->dying_lock);
1806 #endif
1807 ctx->done = true;
1808 nf_ct_put(last);
1809
1810 return skb->len;
1811 }
1812
ctnetlink_get_ct_dying(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])1813 static int ctnetlink_get_ct_dying(struct sk_buff *skb,
1814 const struct nfnl_info *info,
1815 const struct nlattr * const cda[])
1816 {
1817 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1818 struct netlink_dump_control c = {
1819 .dump = ctnetlink_dump_dying,
1820 .done = ctnetlink_done_list,
1821 };
1822 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1823 }
1824
1825 return -EOPNOTSUPP;
1826 }
1827
ctnetlink_get_ct_unconfirmed(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])1828 static int ctnetlink_get_ct_unconfirmed(struct sk_buff *skb,
1829 const struct nfnl_info *info,
1830 const struct nlattr * const cda[])
1831 {
1832 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1833 struct netlink_dump_control c = {
1834 .dump = ctnetlink_dump_unconfirmed,
1835 .done = ctnetlink_done_list,
1836 };
1837 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1838 }
1839
1840 return -EOPNOTSUPP;
1841 }
1842
1843 #if IS_ENABLED(CONFIG_NF_NAT)
1844 static int
ctnetlink_parse_nat_setup(struct nf_conn * ct,enum nf_nat_manip_type manip,const struct nlattr * attr)1845 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1846 enum nf_nat_manip_type manip,
1847 const struct nlattr *attr)
1848 __must_hold(RCU)
1849 {
1850 const struct nf_nat_hook *nat_hook;
1851 int err;
1852
1853 nat_hook = rcu_dereference(nf_nat_hook);
1854 if (!nat_hook) {
1855 #ifdef CONFIG_MODULES
1856 rcu_read_unlock();
1857 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1858 if (request_module("nf-nat") < 0) {
1859 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1860 rcu_read_lock();
1861 return -EOPNOTSUPP;
1862 }
1863 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1864 rcu_read_lock();
1865 nat_hook = rcu_dereference(nf_nat_hook);
1866 if (nat_hook)
1867 return -EAGAIN;
1868 #endif
1869 return -EOPNOTSUPP;
1870 }
1871
1872 err = nat_hook->parse_nat_setup(ct, manip, attr);
1873 if (err == -EAGAIN) {
1874 #ifdef CONFIG_MODULES
1875 rcu_read_unlock();
1876 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1877 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1878 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1879 rcu_read_lock();
1880 return -EOPNOTSUPP;
1881 }
1882 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1883 rcu_read_lock();
1884 #else
1885 err = -EOPNOTSUPP;
1886 #endif
1887 }
1888 return err;
1889 }
1890 #endif
1891
1892 static int
ctnetlink_change_status(struct nf_conn * ct,const struct nlattr * const cda[])1893 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1894 {
1895 return nf_ct_change_status_common(ct, ntohl(nla_get_be32(cda[CTA_STATUS])));
1896 }
1897
1898 static int
ctnetlink_setup_nat(struct nf_conn * ct,const struct nlattr * const cda[])1899 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1900 {
1901 #if IS_ENABLED(CONFIG_NF_NAT)
1902 int ret;
1903
1904 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1905 return 0;
1906
1907 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1908 cda[CTA_NAT_DST]);
1909 if (ret < 0)
1910 return ret;
1911
1912 return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1913 cda[CTA_NAT_SRC]);
1914 #else
1915 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1916 return 0;
1917 return -EOPNOTSUPP;
1918 #endif
1919 }
1920
ctnetlink_change_helper(struct nf_conn * ct,const struct nlattr * const cda[])1921 static int ctnetlink_change_helper(struct nf_conn *ct,
1922 const struct nlattr * const cda[])
1923 {
1924 struct nf_conntrack_helper *helper;
1925 struct nf_conn_help *help = nfct_help(ct);
1926 char *helpname = NULL;
1927 struct nlattr *helpinfo = NULL;
1928 int err;
1929
1930 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1931 if (err < 0)
1932 return err;
1933
1934 /* don't change helper of sibling connections */
1935 if (ct->master) {
1936 /* If we try to change the helper to the same thing twice,
1937 * treat the second attempt as a no-op instead of returning
1938 * an error.
1939 */
1940 err = -EBUSY;
1941 if (help) {
1942 rcu_read_lock();
1943 helper = rcu_dereference(help->helper);
1944 if (helper && !strcmp(helper->name, helpname))
1945 err = 0;
1946 rcu_read_unlock();
1947 }
1948
1949 return err;
1950 }
1951
1952 if (!strcmp(helpname, "")) {
1953 if (help && help->helper) {
1954 /* we had a helper before ... */
1955 nf_ct_remove_expectations(ct);
1956 RCU_INIT_POINTER(help->helper, NULL);
1957 }
1958
1959 return 0;
1960 }
1961
1962 rcu_read_lock();
1963 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1964 nf_ct_protonum(ct));
1965 if (helper == NULL) {
1966 rcu_read_unlock();
1967 return -EOPNOTSUPP;
1968 }
1969
1970 if (help) {
1971 if (rcu_access_pointer(help->helper) == helper) {
1972 /* update private helper data if allowed. */
1973 if (helper->from_nlattr)
1974 helper->from_nlattr(helpinfo, ct);
1975 err = 0;
1976 } else
1977 err = -EBUSY;
1978 } else {
1979 /* we cannot set a helper for an existing conntrack */
1980 err = -EOPNOTSUPP;
1981 }
1982
1983 rcu_read_unlock();
1984 return err;
1985 }
1986
ctnetlink_change_timeout(struct nf_conn * ct,const struct nlattr * const cda[])1987 static int ctnetlink_change_timeout(struct nf_conn *ct,
1988 const struct nlattr * const cda[])
1989 {
1990 return __nf_ct_change_timeout(ct, (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ);
1991 }
1992
1993 #if defined(CONFIG_NF_CONNTRACK_MARK)
ctnetlink_change_mark(struct nf_conn * ct,const struct nlattr * const cda[])1994 static void ctnetlink_change_mark(struct nf_conn *ct,
1995 const struct nlattr * const cda[])
1996 {
1997 u32 mark, newmark, mask = 0;
1998
1999 if (cda[CTA_MARK_MASK])
2000 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2001
2002 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2003 newmark = (READ_ONCE(ct->mark) & mask) ^ mark;
2004 if (newmark != READ_ONCE(ct->mark))
2005 WRITE_ONCE(ct->mark, newmark);
2006 }
2007 #endif
2008
2009 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
2010 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
2011 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
2012 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
2013 };
2014
ctnetlink_change_protoinfo(struct nf_conn * ct,const struct nlattr * const cda[])2015 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
2016 const struct nlattr * const cda[])
2017 {
2018 const struct nlattr *attr = cda[CTA_PROTOINFO];
2019 const struct nf_conntrack_l4proto *l4proto;
2020 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
2021 int err = 0;
2022
2023 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
2024 protoinfo_policy, NULL);
2025 if (err < 0)
2026 return err;
2027
2028 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
2029 if (l4proto->from_nlattr)
2030 err = l4proto->from_nlattr(tb, ct);
2031
2032 return err;
2033 }
2034
2035 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
2036 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
2037 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
2038 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
2039 };
2040
change_seq_adj(struct nf_ct_seqadj * seq,const struct nlattr * const attr)2041 static int change_seq_adj(struct nf_ct_seqadj *seq,
2042 const struct nlattr * const attr)
2043 {
2044 int err;
2045 struct nlattr *cda[CTA_SEQADJ_MAX+1];
2046
2047 err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
2048 seqadj_policy, NULL);
2049 if (err < 0)
2050 return err;
2051
2052 if (!cda[CTA_SEQADJ_CORRECTION_POS])
2053 return -EINVAL;
2054
2055 seq->correction_pos =
2056 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
2057
2058 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
2059 return -EINVAL;
2060
2061 seq->offset_before =
2062 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
2063
2064 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
2065 return -EINVAL;
2066
2067 seq->offset_after =
2068 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
2069
2070 return 0;
2071 }
2072
2073 static int
ctnetlink_change_seq_adj(struct nf_conn * ct,const struct nlattr * const cda[])2074 ctnetlink_change_seq_adj(struct nf_conn *ct,
2075 const struct nlattr * const cda[])
2076 {
2077 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
2078 int ret = 0;
2079
2080 if (!seqadj)
2081 return 0;
2082
2083 spin_lock_bh(&ct->lock);
2084 if (cda[CTA_SEQ_ADJ_ORIG]) {
2085 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
2086 cda[CTA_SEQ_ADJ_ORIG]);
2087 if (ret < 0)
2088 goto err;
2089
2090 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2091 }
2092
2093 if (cda[CTA_SEQ_ADJ_REPLY]) {
2094 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
2095 cda[CTA_SEQ_ADJ_REPLY]);
2096 if (ret < 0)
2097 goto err;
2098
2099 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2100 }
2101
2102 spin_unlock_bh(&ct->lock);
2103 return 0;
2104 err:
2105 spin_unlock_bh(&ct->lock);
2106 return ret;
2107 }
2108
2109 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
2110 [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
2111 [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
2112 [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
2113 };
2114
ctnetlink_change_synproxy(struct nf_conn * ct,const struct nlattr * const cda[])2115 static int ctnetlink_change_synproxy(struct nf_conn *ct,
2116 const struct nlattr * const cda[])
2117 {
2118 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
2119 struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
2120 int err;
2121
2122 if (!synproxy)
2123 return 0;
2124
2125 err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
2126 cda[CTA_SYNPROXY], synproxy_policy,
2127 NULL);
2128 if (err < 0)
2129 return err;
2130
2131 if (!tb[CTA_SYNPROXY_ISN] ||
2132 !tb[CTA_SYNPROXY_ITS] ||
2133 !tb[CTA_SYNPROXY_TSOFF])
2134 return -EINVAL;
2135
2136 synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
2137 synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
2138 synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
2139
2140 return 0;
2141 }
2142
2143 static int
ctnetlink_attach_labels(struct nf_conn * ct,const struct nlattr * const cda[])2144 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
2145 {
2146 #ifdef CONFIG_NF_CONNTRACK_LABELS
2147 size_t len = nla_len(cda[CTA_LABELS]);
2148 const void *mask = cda[CTA_LABELS_MASK];
2149
2150 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
2151 return -EINVAL;
2152
2153 if (mask) {
2154 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
2155 nla_len(cda[CTA_LABELS_MASK]) != len)
2156 return -EINVAL;
2157 mask = nla_data(cda[CTA_LABELS_MASK]);
2158 }
2159
2160 len /= sizeof(u32);
2161
2162 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
2163 #else
2164 return -EOPNOTSUPP;
2165 #endif
2166 }
2167
2168 static int
ctnetlink_change_conntrack(struct nf_conn * ct,const struct nlattr * const cda[])2169 ctnetlink_change_conntrack(struct nf_conn *ct,
2170 const struct nlattr * const cda[])
2171 {
2172 int err;
2173
2174 /* only allow NAT changes and master assignation for new conntracks */
2175 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
2176 return -EOPNOTSUPP;
2177
2178 if (cda[CTA_HELP]) {
2179 err = ctnetlink_change_helper(ct, cda);
2180 if (err < 0)
2181 return err;
2182 }
2183
2184 if (cda[CTA_TIMEOUT]) {
2185 err = ctnetlink_change_timeout(ct, cda);
2186 if (err < 0)
2187 return err;
2188 }
2189
2190 if (cda[CTA_STATUS]) {
2191 err = ctnetlink_change_status(ct, cda);
2192 if (err < 0)
2193 return err;
2194 }
2195
2196 if (cda[CTA_PROTOINFO]) {
2197 err = ctnetlink_change_protoinfo(ct, cda);
2198 if (err < 0)
2199 return err;
2200 }
2201
2202 #if defined(CONFIG_NF_CONNTRACK_MARK)
2203 if (cda[CTA_MARK])
2204 ctnetlink_change_mark(ct, cda);
2205 #endif
2206
2207 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2208 err = ctnetlink_change_seq_adj(ct, cda);
2209 if (err < 0)
2210 return err;
2211 }
2212
2213 if (cda[CTA_SYNPROXY]) {
2214 err = ctnetlink_change_synproxy(ct, cda);
2215 if (err < 0)
2216 return err;
2217 }
2218
2219 if (cda[CTA_LABELS]) {
2220 err = ctnetlink_attach_labels(ct, cda);
2221 if (err < 0)
2222 return err;
2223 }
2224
2225 return 0;
2226 }
2227
2228 static struct nf_conn *
ctnetlink_create_conntrack(struct net * net,const struct nf_conntrack_zone * zone,const struct nlattr * const cda[],struct nf_conntrack_tuple * otuple,struct nf_conntrack_tuple * rtuple,u8 u3)2229 ctnetlink_create_conntrack(struct net *net,
2230 const struct nf_conntrack_zone *zone,
2231 const struct nlattr * const cda[],
2232 struct nf_conntrack_tuple *otuple,
2233 struct nf_conntrack_tuple *rtuple,
2234 u8 u3)
2235 {
2236 struct nf_conn *ct;
2237 int err = -EINVAL;
2238 struct nf_conntrack_helper *helper;
2239 struct nf_conn_tstamp *tstamp;
2240 u64 timeout;
2241
2242 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
2243 if (IS_ERR(ct))
2244 return ERR_PTR(-ENOMEM);
2245
2246 if (!cda[CTA_TIMEOUT])
2247 goto err1;
2248
2249 rcu_read_lock();
2250 if (cda[CTA_HELP]) {
2251 char *helpname = NULL;
2252 struct nlattr *helpinfo = NULL;
2253
2254 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
2255 if (err < 0)
2256 goto err2;
2257
2258 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2259 nf_ct_protonum(ct));
2260 if (helper == NULL) {
2261 rcu_read_unlock();
2262 #ifdef CONFIG_MODULES
2263 if (request_module("nfct-helper-%s", helpname) < 0) {
2264 err = -EOPNOTSUPP;
2265 goto err1;
2266 }
2267
2268 rcu_read_lock();
2269 helper = __nf_conntrack_helper_find(helpname,
2270 nf_ct_l3num(ct),
2271 nf_ct_protonum(ct));
2272 if (helper) {
2273 err = -EAGAIN;
2274 goto err2;
2275 }
2276 rcu_read_unlock();
2277 #endif
2278 err = -EOPNOTSUPP;
2279 goto err1;
2280 } else {
2281 struct nf_conn_help *help;
2282
2283 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2284 if (help == NULL) {
2285 err = -ENOMEM;
2286 goto err2;
2287 }
2288 /* set private helper data if allowed. */
2289 if (helper->from_nlattr)
2290 helper->from_nlattr(helpinfo, ct);
2291
2292 /* disable helper auto-assignment for this entry */
2293 ct->status |= IPS_HELPER;
2294 RCU_INIT_POINTER(help->helper, helper);
2295 }
2296 }
2297
2298 err = ctnetlink_setup_nat(ct, cda);
2299 if (err < 0)
2300 goto err2;
2301
2302 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2303 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2304 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2305 nf_ct_labels_ext_add(ct);
2306 nfct_seqadj_ext_add(ct);
2307 nfct_synproxy_ext_add(ct);
2308
2309 /* we must add conntrack extensions before confirmation. */
2310 ct->status |= IPS_CONFIRMED;
2311
2312 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2313 __nf_ct_set_timeout(ct, timeout);
2314
2315 if (cda[CTA_STATUS]) {
2316 err = ctnetlink_change_status(ct, cda);
2317 if (err < 0)
2318 goto err2;
2319 }
2320
2321 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2322 err = ctnetlink_change_seq_adj(ct, cda);
2323 if (err < 0)
2324 goto err2;
2325 }
2326
2327 memset(&ct->proto, 0, sizeof(ct->proto));
2328 if (cda[CTA_PROTOINFO]) {
2329 err = ctnetlink_change_protoinfo(ct, cda);
2330 if (err < 0)
2331 goto err2;
2332 }
2333
2334 if (cda[CTA_SYNPROXY]) {
2335 err = ctnetlink_change_synproxy(ct, cda);
2336 if (err < 0)
2337 goto err2;
2338 }
2339
2340 #if defined(CONFIG_NF_CONNTRACK_MARK)
2341 if (cda[CTA_MARK])
2342 ctnetlink_change_mark(ct, cda);
2343 #endif
2344
2345 /* setup master conntrack: this is a confirmed expectation */
2346 if (cda[CTA_TUPLE_MASTER]) {
2347 struct nf_conntrack_tuple master;
2348 struct nf_conntrack_tuple_hash *master_h;
2349 struct nf_conn *master_ct;
2350
2351 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2352 u3, NULL);
2353 if (err < 0)
2354 goto err2;
2355
2356 master_h = nf_conntrack_find_get(net, zone, &master);
2357 if (master_h == NULL) {
2358 err = -ENOENT;
2359 goto err2;
2360 }
2361 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2362 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2363 ct->master = master_ct;
2364 }
2365 tstamp = nf_conn_tstamp_find(ct);
2366 if (tstamp)
2367 tstamp->start = ktime_get_real_ns();
2368
2369 err = nf_conntrack_hash_check_insert(ct);
2370 if (err < 0)
2371 goto err3;
2372
2373 rcu_read_unlock();
2374
2375 return ct;
2376
2377 err3:
2378 if (ct->master)
2379 nf_ct_put(ct->master);
2380 err2:
2381 rcu_read_unlock();
2382 err1:
2383 nf_conntrack_free(ct);
2384 return ERR_PTR(err);
2385 }
2386
ctnetlink_new_conntrack(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])2387 static int ctnetlink_new_conntrack(struct sk_buff *skb,
2388 const struct nfnl_info *info,
2389 const struct nlattr * const cda[])
2390 {
2391 struct nf_conntrack_tuple otuple, rtuple;
2392 struct nf_conntrack_tuple_hash *h = NULL;
2393 u_int8_t u3 = info->nfmsg->nfgen_family;
2394 struct nf_conntrack_zone zone;
2395 struct nf_conn *ct;
2396 int err;
2397
2398 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2399 if (err < 0)
2400 return err;
2401
2402 if (cda[CTA_TUPLE_ORIG]) {
2403 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2404 u3, &zone);
2405 if (err < 0)
2406 return err;
2407 }
2408
2409 if (cda[CTA_TUPLE_REPLY]) {
2410 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2411 u3, &zone);
2412 if (err < 0)
2413 return err;
2414 }
2415
2416 if (cda[CTA_TUPLE_ORIG])
2417 h = nf_conntrack_find_get(info->net, &zone, &otuple);
2418 else if (cda[CTA_TUPLE_REPLY])
2419 h = nf_conntrack_find_get(info->net, &zone, &rtuple);
2420
2421 if (h == NULL) {
2422 err = -ENOENT;
2423 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
2424 enum ip_conntrack_events events;
2425
2426 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2427 return -EINVAL;
2428 if (otuple.dst.protonum != rtuple.dst.protonum)
2429 return -EINVAL;
2430
2431 ct = ctnetlink_create_conntrack(info->net, &zone, cda,
2432 &otuple, &rtuple, u3);
2433 if (IS_ERR(ct))
2434 return PTR_ERR(ct);
2435
2436 err = 0;
2437 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2438 events = 1 << IPCT_RELATED;
2439 else
2440 events = 1 << IPCT_NEW;
2441
2442 if (cda[CTA_LABELS] &&
2443 ctnetlink_attach_labels(ct, cda) == 0)
2444 events |= (1 << IPCT_LABEL);
2445
2446 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2447 (1 << IPCT_ASSURED) |
2448 (1 << IPCT_HELPER) |
2449 (1 << IPCT_PROTOINFO) |
2450 (1 << IPCT_SEQADJ) |
2451 (1 << IPCT_MARK) |
2452 (1 << IPCT_SYNPROXY) |
2453 events,
2454 ct, NETLINK_CB(skb).portid,
2455 nlmsg_report(info->nlh));
2456 nf_ct_put(ct);
2457 }
2458
2459 return err;
2460 }
2461 /* implicit 'else' */
2462
2463 err = -EEXIST;
2464 ct = nf_ct_tuplehash_to_ctrack(h);
2465 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL)) {
2466 err = ctnetlink_change_conntrack(ct, cda);
2467 if (err == 0) {
2468 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2469 (1 << IPCT_ASSURED) |
2470 (1 << IPCT_HELPER) |
2471 (1 << IPCT_LABEL) |
2472 (1 << IPCT_PROTOINFO) |
2473 (1 << IPCT_SEQADJ) |
2474 (1 << IPCT_MARK) |
2475 (1 << IPCT_SYNPROXY),
2476 ct, NETLINK_CB(skb).portid,
2477 nlmsg_report(info->nlh));
2478 }
2479 }
2480
2481 nf_ct_put(ct);
2482 return err;
2483 }
2484
2485 static int
ctnetlink_ct_stat_cpu_fill_info(struct sk_buff * skb,u32 portid,u32 seq,__u16 cpu,const struct ip_conntrack_stat * st)2486 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2487 __u16 cpu, const struct ip_conntrack_stat *st)
2488 {
2489 struct nlmsghdr *nlh;
2490 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2491
2492 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2493 IPCTNL_MSG_CT_GET_STATS_CPU);
2494 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2495 NFNETLINK_V0, htons(cpu));
2496 if (!nlh)
2497 goto nlmsg_failure;
2498
2499 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2500 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2501 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2502 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2503 htonl(st->insert_failed)) ||
2504 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2505 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2506 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2507 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2508 htonl(st->search_restart)) ||
2509 nla_put_be32(skb, CTA_STATS_CLASH_RESOLVE,
2510 htonl(st->clash_resolve)) ||
2511 nla_put_be32(skb, CTA_STATS_CHAIN_TOOLONG,
2512 htonl(st->chaintoolong)))
2513 goto nla_put_failure;
2514
2515 nlmsg_end(skb, nlh);
2516 return skb->len;
2517
2518 nla_put_failure:
2519 nlmsg_failure:
2520 nlmsg_cancel(skb, nlh);
2521 return -1;
2522 }
2523
2524 static int
ctnetlink_ct_stat_cpu_dump(struct sk_buff * skb,struct netlink_callback * cb)2525 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2526 {
2527 int cpu;
2528 struct net *net = sock_net(skb->sk);
2529
2530 if (cb->args[0] == nr_cpu_ids)
2531 return 0;
2532
2533 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2534 const struct ip_conntrack_stat *st;
2535
2536 if (!cpu_possible(cpu))
2537 continue;
2538
2539 st = per_cpu_ptr(net->ct.stat, cpu);
2540 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2541 NETLINK_CB(cb->skb).portid,
2542 cb->nlh->nlmsg_seq,
2543 cpu, st) < 0)
2544 break;
2545 }
2546 cb->args[0] = cpu;
2547
2548 return skb->len;
2549 }
2550
ctnetlink_stat_ct_cpu(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])2551 static int ctnetlink_stat_ct_cpu(struct sk_buff *skb,
2552 const struct nfnl_info *info,
2553 const struct nlattr * const cda[])
2554 {
2555 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
2556 struct netlink_dump_control c = {
2557 .dump = ctnetlink_ct_stat_cpu_dump,
2558 };
2559 return netlink_dump_start(info->sk, skb, info->nlh, &c);
2560 }
2561
2562 return 0;
2563 }
2564
2565 static int
ctnetlink_stat_ct_fill_info(struct sk_buff * skb,u32 portid,u32 seq,u32 type,struct net * net)2566 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2567 struct net *net)
2568 {
2569 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2570 unsigned int nr_conntracks;
2571 struct nlmsghdr *nlh;
2572
2573 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2574 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2575 NFNETLINK_V0, 0);
2576 if (!nlh)
2577 goto nlmsg_failure;
2578
2579 nr_conntracks = nf_conntrack_count(net);
2580 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2581 goto nla_put_failure;
2582
2583 if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2584 goto nla_put_failure;
2585
2586 nlmsg_end(skb, nlh);
2587 return skb->len;
2588
2589 nla_put_failure:
2590 nlmsg_failure:
2591 nlmsg_cancel(skb, nlh);
2592 return -1;
2593 }
2594
ctnetlink_stat_ct(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])2595 static int ctnetlink_stat_ct(struct sk_buff *skb, const struct nfnl_info *info,
2596 const struct nlattr * const cda[])
2597 {
2598 struct sk_buff *skb2;
2599 int err;
2600
2601 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2602 if (skb2 == NULL)
2603 return -ENOMEM;
2604
2605 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2606 info->nlh->nlmsg_seq,
2607 NFNL_MSG_TYPE(info->nlh->nlmsg_type),
2608 sock_net(skb->sk));
2609 if (err <= 0) {
2610 kfree_skb(skb2);
2611 return -ENOMEM;
2612 }
2613
2614 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
2615 }
2616
2617 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2618 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2619 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2620 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2621 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2622 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2623 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2624 .len = NF_CT_HELPER_NAME_LEN - 1 },
2625 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2626 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2627 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2628 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2629 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2630 };
2631
2632 static struct nf_conntrack_expect *
2633 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2634 struct nf_conntrack_helper *helper,
2635 struct nf_conntrack_tuple *tuple,
2636 struct nf_conntrack_tuple *mask);
2637
2638 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2639 static size_t
ctnetlink_glue_build_size(const struct nf_conn * ct)2640 ctnetlink_glue_build_size(const struct nf_conn *ct)
2641 {
2642 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2643 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2644 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2645 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2646 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2647 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2648 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2649 + nla_total_size(0) /* CTA_PROTOINFO */
2650 + nla_total_size(0) /* CTA_HELP */
2651 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2652 + ctnetlink_secctx_size(ct)
2653 + ctnetlink_acct_size(ct)
2654 + ctnetlink_timestamp_size(ct)
2655 #if IS_ENABLED(CONFIG_NF_NAT)
2656 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2657 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2658 #endif
2659 #ifdef CONFIG_NF_CONNTRACK_MARK
2660 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2661 #endif
2662 #ifdef CONFIG_NF_CONNTRACK_ZONES
2663 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2664 #endif
2665 + ctnetlink_proto_size(ct)
2666 ;
2667 }
2668
__ctnetlink_glue_build(struct sk_buff * skb,struct nf_conn * ct)2669 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2670 {
2671 const struct nf_conntrack_zone *zone;
2672 struct nlattr *nest_parms;
2673
2674 zone = nf_ct_zone(ct);
2675
2676 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2677 if (!nest_parms)
2678 goto nla_put_failure;
2679 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2680 goto nla_put_failure;
2681 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2682 NF_CT_ZONE_DIR_ORIG) < 0)
2683 goto nla_put_failure;
2684 nla_nest_end(skb, nest_parms);
2685
2686 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2687 if (!nest_parms)
2688 goto nla_put_failure;
2689 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2690 goto nla_put_failure;
2691 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2692 NF_CT_ZONE_DIR_REPL) < 0)
2693 goto nla_put_failure;
2694 nla_nest_end(skb, nest_parms);
2695
2696 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2697 NF_CT_DEFAULT_ZONE_DIR) < 0)
2698 goto nla_put_failure;
2699
2700 if (ctnetlink_dump_id(skb, ct) < 0)
2701 goto nla_put_failure;
2702
2703 if (ctnetlink_dump_status(skb, ct) < 0)
2704 goto nla_put_failure;
2705
2706 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
2707 goto nla_put_failure;
2708
2709 if (ctnetlink_dump_protoinfo(skb, ct, false) < 0)
2710 goto nla_put_failure;
2711
2712 if (ctnetlink_dump_acct(skb, ct, IPCTNL_MSG_CT_GET) < 0 ||
2713 ctnetlink_dump_timestamp(skb, ct) < 0)
2714 goto nla_put_failure;
2715
2716 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2717 goto nla_put_failure;
2718
2719 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2720 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2721 goto nla_put_failure;
2722 #endif
2723 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2724 goto nla_put_failure;
2725
2726 if ((ct->status & IPS_SEQ_ADJUST) &&
2727 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2728 goto nla_put_failure;
2729
2730 if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2731 goto nla_put_failure;
2732
2733 #ifdef CONFIG_NF_CONNTRACK_MARK
2734 if (ctnetlink_dump_mark(skb, ct, true) < 0)
2735 goto nla_put_failure;
2736 #endif
2737 if (ctnetlink_dump_labels(skb, ct) < 0)
2738 goto nla_put_failure;
2739 return 0;
2740
2741 nla_put_failure:
2742 return -ENOSPC;
2743 }
2744
2745 static int
ctnetlink_glue_build(struct sk_buff * skb,struct nf_conn * ct,enum ip_conntrack_info ctinfo,u_int16_t ct_attr,u_int16_t ct_info_attr)2746 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2747 enum ip_conntrack_info ctinfo,
2748 u_int16_t ct_attr, u_int16_t ct_info_attr)
2749 {
2750 struct nlattr *nest_parms;
2751
2752 nest_parms = nla_nest_start(skb, ct_attr);
2753 if (!nest_parms)
2754 goto nla_put_failure;
2755
2756 if (__ctnetlink_glue_build(skb, ct) < 0)
2757 goto nla_put_failure;
2758
2759 nla_nest_end(skb, nest_parms);
2760
2761 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2762 goto nla_put_failure;
2763
2764 return 0;
2765
2766 nla_put_failure:
2767 return -ENOSPC;
2768 }
2769
2770 static int
ctnetlink_update_status(struct nf_conn * ct,const struct nlattr * const cda[])2771 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2772 {
2773 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2774 unsigned long d = ct->status ^ status;
2775
2776 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2777 /* SEEN_REPLY bit can only be set */
2778 return -EBUSY;
2779
2780 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2781 /* ASSURED bit can only be set */
2782 return -EBUSY;
2783
2784 /* This check is less strict than ctnetlink_change_status()
2785 * because callers often flip IPS_EXPECTED bits when sending
2786 * an NFQA_CT attribute to the kernel. So ignore the
2787 * unchangeable bits but do not error out. Also user programs
2788 * are allowed to clear the bits that they are allowed to change.
2789 */
2790 __nf_ct_change_status(ct, status, ~status);
2791 return 0;
2792 }
2793
2794 static int
ctnetlink_glue_parse_ct(const struct nlattr * cda[],struct nf_conn * ct)2795 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2796 {
2797 int err;
2798
2799 if (cda[CTA_TIMEOUT]) {
2800 err = ctnetlink_change_timeout(ct, cda);
2801 if (err < 0)
2802 return err;
2803 }
2804 if (cda[CTA_STATUS]) {
2805 err = ctnetlink_update_status(ct, cda);
2806 if (err < 0)
2807 return err;
2808 }
2809 if (cda[CTA_HELP]) {
2810 err = ctnetlink_change_helper(ct, cda);
2811 if (err < 0)
2812 return err;
2813 }
2814 if (cda[CTA_LABELS]) {
2815 err = ctnetlink_attach_labels(ct, cda);
2816 if (err < 0)
2817 return err;
2818 }
2819 #if defined(CONFIG_NF_CONNTRACK_MARK)
2820 if (cda[CTA_MARK]) {
2821 ctnetlink_change_mark(ct, cda);
2822 }
2823 #endif
2824 return 0;
2825 }
2826
2827 static int
ctnetlink_glue_parse(const struct nlattr * attr,struct nf_conn * ct)2828 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2829 {
2830 struct nlattr *cda[CTA_MAX+1];
2831 int ret;
2832
2833 ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2834 NULL);
2835 if (ret < 0)
2836 return ret;
2837
2838 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2839 }
2840
ctnetlink_glue_exp_parse(const struct nlattr * const * cda,const struct nf_conn * ct,struct nf_conntrack_tuple * tuple,struct nf_conntrack_tuple * mask)2841 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2842 const struct nf_conn *ct,
2843 struct nf_conntrack_tuple *tuple,
2844 struct nf_conntrack_tuple *mask)
2845 {
2846 int err;
2847
2848 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2849 nf_ct_l3num(ct), NULL);
2850 if (err < 0)
2851 return err;
2852
2853 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2854 nf_ct_l3num(ct), NULL);
2855 }
2856
2857 static int
ctnetlink_glue_attach_expect(const struct nlattr * attr,struct nf_conn * ct,u32 portid,u32 report)2858 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2859 u32 portid, u32 report)
2860 {
2861 struct nlattr *cda[CTA_EXPECT_MAX+1];
2862 struct nf_conntrack_tuple tuple, mask;
2863 struct nf_conntrack_helper *helper = NULL;
2864 struct nf_conntrack_expect *exp;
2865 int err;
2866
2867 err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2868 exp_nla_policy, NULL);
2869 if (err < 0)
2870 return err;
2871
2872 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2873 ct, &tuple, &mask);
2874 if (err < 0)
2875 return err;
2876
2877 if (cda[CTA_EXPECT_HELP_NAME]) {
2878 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2879
2880 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2881 nf_ct_protonum(ct));
2882 if (helper == NULL)
2883 return -EOPNOTSUPP;
2884 }
2885
2886 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2887 helper, &tuple, &mask);
2888 if (IS_ERR(exp))
2889 return PTR_ERR(exp);
2890
2891 err = nf_ct_expect_related_report(exp, portid, report, 0);
2892 nf_ct_expect_put(exp);
2893 return err;
2894 }
2895
ctnetlink_glue_seqadj(struct sk_buff * skb,struct nf_conn * ct,enum ip_conntrack_info ctinfo,int diff)2896 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2897 enum ip_conntrack_info ctinfo, int diff)
2898 {
2899 if (!(ct->status & IPS_NAT_MASK))
2900 return;
2901
2902 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2903 }
2904
2905 static const struct nfnl_ct_hook ctnetlink_glue_hook = {
2906 .build_size = ctnetlink_glue_build_size,
2907 .build = ctnetlink_glue_build,
2908 .parse = ctnetlink_glue_parse,
2909 .attach_expect = ctnetlink_glue_attach_expect,
2910 .seq_adjust = ctnetlink_glue_seqadj,
2911 };
2912 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2913
2914 /***********************************************************************
2915 * EXPECT
2916 ***********************************************************************/
2917
ctnetlink_exp_dump_tuple(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple,u32 type)2918 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2919 const struct nf_conntrack_tuple *tuple,
2920 u32 type)
2921 {
2922 struct nlattr *nest_parms;
2923
2924 nest_parms = nla_nest_start(skb, type);
2925 if (!nest_parms)
2926 goto nla_put_failure;
2927 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2928 goto nla_put_failure;
2929 nla_nest_end(skb, nest_parms);
2930
2931 return 0;
2932
2933 nla_put_failure:
2934 return -1;
2935 }
2936
ctnetlink_exp_dump_mask(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple,const struct nf_conntrack_tuple_mask * mask)2937 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2938 const struct nf_conntrack_tuple *tuple,
2939 const struct nf_conntrack_tuple_mask *mask)
2940 {
2941 const struct nf_conntrack_l4proto *l4proto;
2942 struct nf_conntrack_tuple m;
2943 struct nlattr *nest_parms;
2944 int ret;
2945
2946 memset(&m, 0xFF, sizeof(m));
2947 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2948 m.src.u.all = mask->src.u.all;
2949 m.src.l3num = tuple->src.l3num;
2950 m.dst.protonum = tuple->dst.protonum;
2951
2952 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2953 if (!nest_parms)
2954 goto nla_put_failure;
2955
2956 rcu_read_lock();
2957 ret = ctnetlink_dump_tuples_ip(skb, &m);
2958 if (ret >= 0) {
2959 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2960 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2961 }
2962 rcu_read_unlock();
2963
2964 if (unlikely(ret < 0))
2965 goto nla_put_failure;
2966
2967 nla_nest_end(skb, nest_parms);
2968
2969 return 0;
2970
2971 nla_put_failure:
2972 return -1;
2973 }
2974
2975 #if IS_ENABLED(CONFIG_NF_NAT)
2976 static const union nf_inet_addr any_addr;
2977 #endif
2978
nf_expect_get_id(const struct nf_conntrack_expect * exp)2979 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2980 {
2981 static siphash_aligned_key_t exp_id_seed;
2982 unsigned long a, b, c, d;
2983
2984 net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
2985
2986 a = (unsigned long)exp;
2987 b = (unsigned long)exp->helper;
2988 c = (unsigned long)exp->master;
2989 d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
2990
2991 #ifdef CONFIG_64BIT
2992 return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
2993 #else
2994 return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
2995 #endif
2996 }
2997
2998 static int
ctnetlink_exp_dump_expect(struct sk_buff * skb,const struct nf_conntrack_expect * exp)2999 ctnetlink_exp_dump_expect(struct sk_buff *skb,
3000 const struct nf_conntrack_expect *exp)
3001 {
3002 struct nf_conn *master = exp->master;
3003 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
3004 struct nf_conn_help *help;
3005 #if IS_ENABLED(CONFIG_NF_NAT)
3006 struct nlattr *nest_parms;
3007 struct nf_conntrack_tuple nat_tuple = {};
3008 #endif
3009 struct nf_ct_helper_expectfn *expfn;
3010
3011 if (timeout < 0)
3012 timeout = 0;
3013
3014 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
3015 goto nla_put_failure;
3016 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
3017 goto nla_put_failure;
3018 if (ctnetlink_exp_dump_tuple(skb,
3019 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
3020 CTA_EXPECT_MASTER) < 0)
3021 goto nla_put_failure;
3022
3023 #if IS_ENABLED(CONFIG_NF_NAT)
3024 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
3025 exp->saved_proto.all) {
3026 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
3027 if (!nest_parms)
3028 goto nla_put_failure;
3029
3030 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
3031 goto nla_put_failure;
3032
3033 nat_tuple.src.l3num = nf_ct_l3num(master);
3034 nat_tuple.src.u3 = exp->saved_addr;
3035 nat_tuple.dst.protonum = nf_ct_protonum(master);
3036 nat_tuple.src.u = exp->saved_proto;
3037
3038 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
3039 CTA_EXPECT_NAT_TUPLE) < 0)
3040 goto nla_put_failure;
3041 nla_nest_end(skb, nest_parms);
3042 }
3043 #endif
3044 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
3045 nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
3046 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
3047 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
3048 goto nla_put_failure;
3049 help = nfct_help(master);
3050 if (help) {
3051 struct nf_conntrack_helper *helper;
3052
3053 helper = rcu_dereference(help->helper);
3054 if (helper &&
3055 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
3056 goto nla_put_failure;
3057 }
3058 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
3059 if (expfn != NULL &&
3060 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
3061 goto nla_put_failure;
3062
3063 return 0;
3064
3065 nla_put_failure:
3066 return -1;
3067 }
3068
3069 static int
ctnetlink_exp_fill_info(struct sk_buff * skb,u32 portid,u32 seq,int event,const struct nf_conntrack_expect * exp)3070 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
3071 int event, const struct nf_conntrack_expect *exp)
3072 {
3073 struct nlmsghdr *nlh;
3074 unsigned int flags = portid ? NLM_F_MULTI : 0;
3075
3076 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
3077 nlh = nfnl_msg_put(skb, portid, seq, event, flags,
3078 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3079 if (!nlh)
3080 goto nlmsg_failure;
3081
3082 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3083 goto nla_put_failure;
3084
3085 nlmsg_end(skb, nlh);
3086 return skb->len;
3087
3088 nlmsg_failure:
3089 nla_put_failure:
3090 nlmsg_cancel(skb, nlh);
3091 return -1;
3092 }
3093
3094 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3095 static int
ctnetlink_expect_event(unsigned int events,const struct nf_exp_event * item)3096 ctnetlink_expect_event(unsigned int events, const struct nf_exp_event *item)
3097 {
3098 struct nf_conntrack_expect *exp = item->exp;
3099 struct net *net = nf_ct_exp_net(exp);
3100 struct nlmsghdr *nlh;
3101 struct sk_buff *skb;
3102 unsigned int type, group;
3103 int flags = 0;
3104
3105 if (events & (1 << IPEXP_DESTROY)) {
3106 type = IPCTNL_MSG_EXP_DELETE;
3107 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
3108 } else if (events & (1 << IPEXP_NEW)) {
3109 type = IPCTNL_MSG_EXP_NEW;
3110 flags = NLM_F_CREATE|NLM_F_EXCL;
3111 group = NFNLGRP_CONNTRACK_EXP_NEW;
3112 } else
3113 return 0;
3114
3115 if (!item->report && !nfnetlink_has_listeners(net, group))
3116 return 0;
3117
3118 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
3119 if (skb == NULL)
3120 goto errout;
3121
3122 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
3123 nlh = nfnl_msg_put(skb, item->portid, 0, type, flags,
3124 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3125 if (!nlh)
3126 goto nlmsg_failure;
3127
3128 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3129 goto nla_put_failure;
3130
3131 nlmsg_end(skb, nlh);
3132 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
3133 return 0;
3134
3135 nla_put_failure:
3136 nlmsg_cancel(skb, nlh);
3137 nlmsg_failure:
3138 kfree_skb(skb);
3139 errout:
3140 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
3141 return 0;
3142 }
3143 #endif
ctnetlink_exp_done(struct netlink_callback * cb)3144 static int ctnetlink_exp_done(struct netlink_callback *cb)
3145 {
3146 if (cb->args[1])
3147 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
3148 return 0;
3149 }
3150
3151 static int
ctnetlink_exp_dump_table(struct sk_buff * skb,struct netlink_callback * cb)3152 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3153 {
3154 struct net *net = sock_net(skb->sk);
3155 struct nf_conntrack_expect *exp, *last;
3156 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3157 u_int8_t l3proto = nfmsg->nfgen_family;
3158
3159 rcu_read_lock();
3160 last = (struct nf_conntrack_expect *)cb->args[1];
3161 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
3162 restart:
3163 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
3164 hnode) {
3165 if (l3proto && exp->tuple.src.l3num != l3proto)
3166 continue;
3167
3168 if (!net_eq(nf_ct_net(exp->master), net))
3169 continue;
3170
3171 if (cb->args[1]) {
3172 if (exp != last)
3173 continue;
3174 cb->args[1] = 0;
3175 }
3176 if (ctnetlink_exp_fill_info(skb,
3177 NETLINK_CB(cb->skb).portid,
3178 cb->nlh->nlmsg_seq,
3179 IPCTNL_MSG_EXP_NEW,
3180 exp) < 0) {
3181 if (!refcount_inc_not_zero(&exp->use))
3182 continue;
3183 cb->args[1] = (unsigned long)exp;
3184 goto out;
3185 }
3186 }
3187 if (cb->args[1]) {
3188 cb->args[1] = 0;
3189 goto restart;
3190 }
3191 }
3192 out:
3193 rcu_read_unlock();
3194 if (last)
3195 nf_ct_expect_put(last);
3196
3197 return skb->len;
3198 }
3199
3200 static int
ctnetlink_exp_ct_dump_table(struct sk_buff * skb,struct netlink_callback * cb)3201 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3202 {
3203 struct nf_conntrack_expect *exp, *last;
3204 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3205 struct nf_conn *ct = cb->data;
3206 struct nf_conn_help *help = nfct_help(ct);
3207 u_int8_t l3proto = nfmsg->nfgen_family;
3208
3209 if (cb->args[0])
3210 return 0;
3211
3212 rcu_read_lock();
3213 last = (struct nf_conntrack_expect *)cb->args[1];
3214 restart:
3215 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
3216 if (l3proto && exp->tuple.src.l3num != l3proto)
3217 continue;
3218 if (cb->args[1]) {
3219 if (exp != last)
3220 continue;
3221 cb->args[1] = 0;
3222 }
3223 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
3224 cb->nlh->nlmsg_seq,
3225 IPCTNL_MSG_EXP_NEW,
3226 exp) < 0) {
3227 if (!refcount_inc_not_zero(&exp->use))
3228 continue;
3229 cb->args[1] = (unsigned long)exp;
3230 goto out;
3231 }
3232 }
3233 if (cb->args[1]) {
3234 cb->args[1] = 0;
3235 goto restart;
3236 }
3237 cb->args[0] = 1;
3238 out:
3239 rcu_read_unlock();
3240 if (last)
3241 nf_ct_expect_put(last);
3242
3243 return skb->len;
3244 }
3245
ctnetlink_dump_exp_ct(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[],struct netlink_ext_ack * extack)3246 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
3247 struct sk_buff *skb,
3248 const struct nlmsghdr *nlh,
3249 const struct nlattr * const cda[],
3250 struct netlink_ext_ack *extack)
3251 {
3252 int err;
3253 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3254 u_int8_t u3 = nfmsg->nfgen_family;
3255 struct nf_conntrack_tuple tuple;
3256 struct nf_conntrack_tuple_hash *h;
3257 struct nf_conn *ct;
3258 struct nf_conntrack_zone zone;
3259 struct netlink_dump_control c = {
3260 .dump = ctnetlink_exp_ct_dump_table,
3261 .done = ctnetlink_exp_done,
3262 };
3263
3264 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3265 u3, NULL);
3266 if (err < 0)
3267 return err;
3268
3269 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3270 if (err < 0)
3271 return err;
3272
3273 h = nf_conntrack_find_get(net, &zone, &tuple);
3274 if (!h)
3275 return -ENOENT;
3276
3277 ct = nf_ct_tuplehash_to_ctrack(h);
3278 /* No expectation linked to this connection tracking. */
3279 if (!nfct_help(ct)) {
3280 nf_ct_put(ct);
3281 return 0;
3282 }
3283
3284 c.data = ct;
3285
3286 err = netlink_dump_start(ctnl, skb, nlh, &c);
3287 nf_ct_put(ct);
3288
3289 return err;
3290 }
3291
ctnetlink_get_expect(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])3292 static int ctnetlink_get_expect(struct sk_buff *skb,
3293 const struct nfnl_info *info,
3294 const struct nlattr * const cda[])
3295 {
3296 u_int8_t u3 = info->nfmsg->nfgen_family;
3297 struct nf_conntrack_tuple tuple;
3298 struct nf_conntrack_expect *exp;
3299 struct nf_conntrack_zone zone;
3300 struct sk_buff *skb2;
3301 int err;
3302
3303 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3304 if (cda[CTA_EXPECT_MASTER])
3305 return ctnetlink_dump_exp_ct(info->net, info->sk, skb,
3306 info->nlh, cda,
3307 info->extack);
3308 else {
3309 struct netlink_dump_control c = {
3310 .dump = ctnetlink_exp_dump_table,
3311 .done = ctnetlink_exp_done,
3312 };
3313 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3314 }
3315 }
3316
3317 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3318 if (err < 0)
3319 return err;
3320
3321 if (cda[CTA_EXPECT_TUPLE])
3322 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3323 u3, NULL);
3324 else if (cda[CTA_EXPECT_MASTER])
3325 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3326 u3, NULL);
3327 else
3328 return -EINVAL;
3329
3330 if (err < 0)
3331 return err;
3332
3333 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3334 if (!exp)
3335 return -ENOENT;
3336
3337 if (cda[CTA_EXPECT_ID]) {
3338 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3339
3340 if (id != nf_expect_get_id(exp)) {
3341 nf_ct_expect_put(exp);
3342 return -ENOENT;
3343 }
3344 }
3345
3346 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3347 if (!skb2) {
3348 nf_ct_expect_put(exp);
3349 return -ENOMEM;
3350 }
3351
3352 rcu_read_lock();
3353 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3354 info->nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
3355 exp);
3356 rcu_read_unlock();
3357 nf_ct_expect_put(exp);
3358 if (err <= 0) {
3359 kfree_skb(skb2);
3360 return -ENOMEM;
3361 }
3362
3363 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
3364 }
3365
expect_iter_name(struct nf_conntrack_expect * exp,void * data)3366 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3367 {
3368 struct nf_conntrack_helper *helper;
3369 const struct nf_conn_help *m_help;
3370 const char *name = data;
3371
3372 m_help = nfct_help(exp->master);
3373
3374 helper = rcu_dereference(m_help->helper);
3375 if (!helper)
3376 return false;
3377
3378 return strcmp(helper->name, name) == 0;
3379 }
3380
expect_iter_all(struct nf_conntrack_expect * exp,void * data)3381 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3382 {
3383 return true;
3384 }
3385
ctnetlink_del_expect(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])3386 static int ctnetlink_del_expect(struct sk_buff *skb,
3387 const struct nfnl_info *info,
3388 const struct nlattr * const cda[])
3389 {
3390 u_int8_t u3 = info->nfmsg->nfgen_family;
3391 struct nf_conntrack_expect *exp;
3392 struct nf_conntrack_tuple tuple;
3393 struct nf_conntrack_zone zone;
3394 int err;
3395
3396 if (cda[CTA_EXPECT_TUPLE]) {
3397 /* delete a single expect by tuple */
3398 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3399 if (err < 0)
3400 return err;
3401
3402 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3403 u3, NULL);
3404 if (err < 0)
3405 return err;
3406
3407 /* bump usage count to 2 */
3408 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3409 if (!exp)
3410 return -ENOENT;
3411
3412 if (cda[CTA_EXPECT_ID]) {
3413 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3414 if (ntohl(id) != (u32)(unsigned long)exp) {
3415 nf_ct_expect_put(exp);
3416 return -ENOENT;
3417 }
3418 }
3419
3420 /* after list removal, usage count == 1 */
3421 spin_lock_bh(&nf_conntrack_expect_lock);
3422 if (del_timer(&exp->timeout)) {
3423 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3424 nlmsg_report(info->nlh));
3425 nf_ct_expect_put(exp);
3426 }
3427 spin_unlock_bh(&nf_conntrack_expect_lock);
3428 /* have to put what we 'get' above.
3429 * after this line usage count == 0 */
3430 nf_ct_expect_put(exp);
3431 } else if (cda[CTA_EXPECT_HELP_NAME]) {
3432 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3433
3434 nf_ct_expect_iterate_net(info->net, expect_iter_name, name,
3435 NETLINK_CB(skb).portid,
3436 nlmsg_report(info->nlh));
3437 } else {
3438 /* This basically means we have to flush everything*/
3439 nf_ct_expect_iterate_net(info->net, expect_iter_all, NULL,
3440 NETLINK_CB(skb).portid,
3441 nlmsg_report(info->nlh));
3442 }
3443
3444 return 0;
3445 }
3446 static int
ctnetlink_change_expect(struct nf_conntrack_expect * x,const struct nlattr * const cda[])3447 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3448 const struct nlattr * const cda[])
3449 {
3450 if (cda[CTA_EXPECT_TIMEOUT]) {
3451 if (!del_timer(&x->timeout))
3452 return -ETIME;
3453
3454 x->timeout.expires = jiffies +
3455 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3456 add_timer(&x->timeout);
3457 }
3458 return 0;
3459 }
3460
3461 #if IS_ENABLED(CONFIG_NF_NAT)
3462 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3463 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3464 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3465 };
3466 #endif
3467
3468 static int
ctnetlink_parse_expect_nat(const struct nlattr * attr,struct nf_conntrack_expect * exp,u_int8_t u3)3469 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3470 struct nf_conntrack_expect *exp,
3471 u_int8_t u3)
3472 {
3473 #if IS_ENABLED(CONFIG_NF_NAT)
3474 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3475 struct nf_conntrack_tuple nat_tuple = {};
3476 int err;
3477
3478 err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3479 exp_nat_nla_policy, NULL);
3480 if (err < 0)
3481 return err;
3482
3483 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3484 return -EINVAL;
3485
3486 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3487 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3488 u3, NULL);
3489 if (err < 0)
3490 return err;
3491
3492 exp->saved_addr = nat_tuple.src.u3;
3493 exp->saved_proto = nat_tuple.src.u;
3494 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3495
3496 return 0;
3497 #else
3498 return -EOPNOTSUPP;
3499 #endif
3500 }
3501
3502 static struct nf_conntrack_expect *
ctnetlink_alloc_expect(const struct nlattr * const cda[],struct nf_conn * ct,struct nf_conntrack_helper * helper,struct nf_conntrack_tuple * tuple,struct nf_conntrack_tuple * mask)3503 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3504 struct nf_conntrack_helper *helper,
3505 struct nf_conntrack_tuple *tuple,
3506 struct nf_conntrack_tuple *mask)
3507 {
3508 u_int32_t class = 0;
3509 struct nf_conntrack_expect *exp;
3510 struct nf_conn_help *help;
3511 int err;
3512
3513 help = nfct_help(ct);
3514 if (!help)
3515 return ERR_PTR(-EOPNOTSUPP);
3516
3517 if (cda[CTA_EXPECT_CLASS] && helper) {
3518 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3519 if (class > helper->expect_class_max)
3520 return ERR_PTR(-EINVAL);
3521 }
3522 exp = nf_ct_expect_alloc(ct);
3523 if (!exp)
3524 return ERR_PTR(-ENOMEM);
3525
3526 if (cda[CTA_EXPECT_FLAGS]) {
3527 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3528 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3529 } else {
3530 exp->flags = 0;
3531 }
3532 if (cda[CTA_EXPECT_FN]) {
3533 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3534 struct nf_ct_helper_expectfn *expfn;
3535
3536 expfn = nf_ct_helper_expectfn_find_by_name(name);
3537 if (expfn == NULL) {
3538 err = -EINVAL;
3539 goto err_out;
3540 }
3541 exp->expectfn = expfn->expectfn;
3542 } else
3543 exp->expectfn = NULL;
3544
3545 exp->class = class;
3546 exp->master = ct;
3547 exp->helper = helper;
3548 exp->tuple = *tuple;
3549 exp->mask.src.u3 = mask->src.u3;
3550 exp->mask.src.u.all = mask->src.u.all;
3551
3552 if (cda[CTA_EXPECT_NAT]) {
3553 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3554 exp, nf_ct_l3num(ct));
3555 if (err < 0)
3556 goto err_out;
3557 }
3558 return exp;
3559 err_out:
3560 nf_ct_expect_put(exp);
3561 return ERR_PTR(err);
3562 }
3563
3564 static int
ctnetlink_create_expect(struct net * net,const struct nf_conntrack_zone * zone,const struct nlattr * const cda[],u_int8_t u3,u32 portid,int report)3565 ctnetlink_create_expect(struct net *net,
3566 const struct nf_conntrack_zone *zone,
3567 const struct nlattr * const cda[],
3568 u_int8_t u3, u32 portid, int report)
3569 {
3570 struct nf_conntrack_tuple tuple, mask, master_tuple;
3571 struct nf_conntrack_tuple_hash *h = NULL;
3572 struct nf_conntrack_helper *helper = NULL;
3573 struct nf_conntrack_expect *exp;
3574 struct nf_conn *ct;
3575 int err;
3576
3577 /* caller guarantees that those three CTA_EXPECT_* exist */
3578 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3579 u3, NULL);
3580 if (err < 0)
3581 return err;
3582 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3583 u3, NULL);
3584 if (err < 0)
3585 return err;
3586 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3587 u3, NULL);
3588 if (err < 0)
3589 return err;
3590
3591 /* Look for master conntrack of this expectation */
3592 h = nf_conntrack_find_get(net, zone, &master_tuple);
3593 if (!h)
3594 return -ENOENT;
3595 ct = nf_ct_tuplehash_to_ctrack(h);
3596
3597 rcu_read_lock();
3598 if (cda[CTA_EXPECT_HELP_NAME]) {
3599 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3600
3601 helper = __nf_conntrack_helper_find(helpname, u3,
3602 nf_ct_protonum(ct));
3603 if (helper == NULL) {
3604 rcu_read_unlock();
3605 #ifdef CONFIG_MODULES
3606 if (request_module("nfct-helper-%s", helpname) < 0) {
3607 err = -EOPNOTSUPP;
3608 goto err_ct;
3609 }
3610 rcu_read_lock();
3611 helper = __nf_conntrack_helper_find(helpname, u3,
3612 nf_ct_protonum(ct));
3613 if (helper) {
3614 err = -EAGAIN;
3615 goto err_rcu;
3616 }
3617 rcu_read_unlock();
3618 #endif
3619 err = -EOPNOTSUPP;
3620 goto err_ct;
3621 }
3622 }
3623
3624 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3625 if (IS_ERR(exp)) {
3626 err = PTR_ERR(exp);
3627 goto err_rcu;
3628 }
3629
3630 err = nf_ct_expect_related_report(exp, portid, report, 0);
3631 nf_ct_expect_put(exp);
3632 err_rcu:
3633 rcu_read_unlock();
3634 err_ct:
3635 nf_ct_put(ct);
3636 return err;
3637 }
3638
ctnetlink_new_expect(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])3639 static int ctnetlink_new_expect(struct sk_buff *skb,
3640 const struct nfnl_info *info,
3641 const struct nlattr * const cda[])
3642 {
3643 u_int8_t u3 = info->nfmsg->nfgen_family;
3644 struct nf_conntrack_tuple tuple;
3645 struct nf_conntrack_expect *exp;
3646 struct nf_conntrack_zone zone;
3647 int err;
3648
3649 if (!cda[CTA_EXPECT_TUPLE]
3650 || !cda[CTA_EXPECT_MASK]
3651 || !cda[CTA_EXPECT_MASTER])
3652 return -EINVAL;
3653
3654 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3655 if (err < 0)
3656 return err;
3657
3658 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3659 u3, NULL);
3660 if (err < 0)
3661 return err;
3662
3663 spin_lock_bh(&nf_conntrack_expect_lock);
3664 exp = __nf_ct_expect_find(info->net, &zone, &tuple);
3665 if (!exp) {
3666 spin_unlock_bh(&nf_conntrack_expect_lock);
3667 err = -ENOENT;
3668 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
3669 err = ctnetlink_create_expect(info->net, &zone, cda, u3,
3670 NETLINK_CB(skb).portid,
3671 nlmsg_report(info->nlh));
3672 }
3673 return err;
3674 }
3675
3676 err = -EEXIST;
3677 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL))
3678 err = ctnetlink_change_expect(exp, cda);
3679 spin_unlock_bh(&nf_conntrack_expect_lock);
3680
3681 return err;
3682 }
3683
3684 static int
ctnetlink_exp_stat_fill_info(struct sk_buff * skb,u32 portid,u32 seq,int cpu,const struct ip_conntrack_stat * st)3685 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3686 const struct ip_conntrack_stat *st)
3687 {
3688 struct nlmsghdr *nlh;
3689 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3690
3691 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3692 IPCTNL_MSG_EXP_GET_STATS_CPU);
3693 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
3694 NFNETLINK_V0, htons(cpu));
3695 if (!nlh)
3696 goto nlmsg_failure;
3697
3698 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3699 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3700 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3701 goto nla_put_failure;
3702
3703 nlmsg_end(skb, nlh);
3704 return skb->len;
3705
3706 nla_put_failure:
3707 nlmsg_failure:
3708 nlmsg_cancel(skb, nlh);
3709 return -1;
3710 }
3711
3712 static int
ctnetlink_exp_stat_cpu_dump(struct sk_buff * skb,struct netlink_callback * cb)3713 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3714 {
3715 int cpu;
3716 struct net *net = sock_net(skb->sk);
3717
3718 if (cb->args[0] == nr_cpu_ids)
3719 return 0;
3720
3721 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3722 const struct ip_conntrack_stat *st;
3723
3724 if (!cpu_possible(cpu))
3725 continue;
3726
3727 st = per_cpu_ptr(net->ct.stat, cpu);
3728 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3729 cb->nlh->nlmsg_seq,
3730 cpu, st) < 0)
3731 break;
3732 }
3733 cb->args[0] = cpu;
3734
3735 return skb->len;
3736 }
3737
ctnetlink_stat_exp_cpu(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])3738 static int ctnetlink_stat_exp_cpu(struct sk_buff *skb,
3739 const struct nfnl_info *info,
3740 const struct nlattr * const cda[])
3741 {
3742 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3743 struct netlink_dump_control c = {
3744 .dump = ctnetlink_exp_stat_cpu_dump,
3745 };
3746 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3747 }
3748
3749 return 0;
3750 }
3751
3752 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3753 static struct nf_ct_event_notifier ctnl_notifier = {
3754 .ct_event = ctnetlink_conntrack_event,
3755 .exp_event = ctnetlink_expect_event,
3756 };
3757 #endif
3758
3759 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3760 [IPCTNL_MSG_CT_NEW] = {
3761 .call = ctnetlink_new_conntrack,
3762 .type = NFNL_CB_MUTEX,
3763 .attr_count = CTA_MAX,
3764 .policy = ct_nla_policy
3765 },
3766 [IPCTNL_MSG_CT_GET] = {
3767 .call = ctnetlink_get_conntrack,
3768 .type = NFNL_CB_MUTEX,
3769 .attr_count = CTA_MAX,
3770 .policy = ct_nla_policy
3771 },
3772 [IPCTNL_MSG_CT_DELETE] = {
3773 .call = ctnetlink_del_conntrack,
3774 .type = NFNL_CB_MUTEX,
3775 .attr_count = CTA_MAX,
3776 .policy = ct_nla_policy
3777 },
3778 [IPCTNL_MSG_CT_GET_CTRZERO] = {
3779 .call = ctnetlink_get_conntrack,
3780 .type = NFNL_CB_MUTEX,
3781 .attr_count = CTA_MAX,
3782 .policy = ct_nla_policy
3783 },
3784 [IPCTNL_MSG_CT_GET_STATS_CPU] = {
3785 .call = ctnetlink_stat_ct_cpu,
3786 .type = NFNL_CB_MUTEX,
3787 },
3788 [IPCTNL_MSG_CT_GET_STATS] = {
3789 .call = ctnetlink_stat_ct,
3790 .type = NFNL_CB_MUTEX,
3791 },
3792 [IPCTNL_MSG_CT_GET_DYING] = {
3793 .call = ctnetlink_get_ct_dying,
3794 .type = NFNL_CB_MUTEX,
3795 },
3796 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = {
3797 .call = ctnetlink_get_ct_unconfirmed,
3798 .type = NFNL_CB_MUTEX,
3799 },
3800 };
3801
3802 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3803 [IPCTNL_MSG_EXP_GET] = {
3804 .call = ctnetlink_get_expect,
3805 .type = NFNL_CB_MUTEX,
3806 .attr_count = CTA_EXPECT_MAX,
3807 .policy = exp_nla_policy
3808 },
3809 [IPCTNL_MSG_EXP_NEW] = {
3810 .call = ctnetlink_new_expect,
3811 .type = NFNL_CB_MUTEX,
3812 .attr_count = CTA_EXPECT_MAX,
3813 .policy = exp_nla_policy
3814 },
3815 [IPCTNL_MSG_EXP_DELETE] = {
3816 .call = ctnetlink_del_expect,
3817 .type = NFNL_CB_MUTEX,
3818 .attr_count = CTA_EXPECT_MAX,
3819 .policy = exp_nla_policy
3820 },
3821 [IPCTNL_MSG_EXP_GET_STATS_CPU] = {
3822 .call = ctnetlink_stat_exp_cpu,
3823 .type = NFNL_CB_MUTEX,
3824 },
3825 };
3826
3827 static const struct nfnetlink_subsystem ctnl_subsys = {
3828 .name = "conntrack",
3829 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3830 .cb_count = IPCTNL_MSG_MAX,
3831 .cb = ctnl_cb,
3832 };
3833
3834 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3835 .name = "conntrack_expect",
3836 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3837 .cb_count = IPCTNL_MSG_EXP_MAX,
3838 .cb = ctnl_exp_cb,
3839 };
3840
3841 MODULE_ALIAS("ip_conntrack_netlink");
3842 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3843 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3844
ctnetlink_net_init(struct net * net)3845 static int __net_init ctnetlink_net_init(struct net *net)
3846 {
3847 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3848 nf_conntrack_register_notifier(net, &ctnl_notifier);
3849 #endif
3850 return 0;
3851 }
3852
ctnetlink_net_pre_exit(struct net * net)3853 static void ctnetlink_net_pre_exit(struct net *net)
3854 {
3855 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3856 nf_conntrack_unregister_notifier(net);
3857 #endif
3858 }
3859
3860 static struct pernet_operations ctnetlink_net_ops = {
3861 .init = ctnetlink_net_init,
3862 .pre_exit = ctnetlink_net_pre_exit,
3863 };
3864
ctnetlink_init(void)3865 static int __init ctnetlink_init(void)
3866 {
3867 int ret;
3868
3869 NL_ASSERT_DUMP_CTX_FITS(struct ctnetlink_list_dump_ctx);
3870
3871 ret = nfnetlink_subsys_register(&ctnl_subsys);
3872 if (ret < 0) {
3873 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3874 goto err_out;
3875 }
3876
3877 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3878 if (ret < 0) {
3879 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3880 goto err_unreg_subsys;
3881 }
3882
3883 ret = register_pernet_subsys(&ctnetlink_net_ops);
3884 if (ret < 0) {
3885 pr_err("ctnetlink_init: cannot register pernet operations\n");
3886 goto err_unreg_exp_subsys;
3887 }
3888 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3889 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3890 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3891 #endif
3892 return 0;
3893
3894 err_unreg_exp_subsys:
3895 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3896 err_unreg_subsys:
3897 nfnetlink_subsys_unregister(&ctnl_subsys);
3898 err_out:
3899 return ret;
3900 }
3901
ctnetlink_exit(void)3902 static void __exit ctnetlink_exit(void)
3903 {
3904 unregister_pernet_subsys(&ctnetlink_net_ops);
3905 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3906 nfnetlink_subsys_unregister(&ctnl_subsys);
3907 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3908 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3909 #endif
3910 synchronize_rcu();
3911 }
3912
3913 module_init(ctnetlink_init);
3914 module_exit(ctnetlink_exit);
3915