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 MODULE_DESCRIPTION("List and change connection tracking table");
61
62 struct ctnetlink_list_dump_ctx {
63 struct nf_conn *last;
64 unsigned int cpu;
65 bool done;
66 };
67
ctnetlink_dump_tuples_proto(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple,const struct nf_conntrack_l4proto * l4proto)68 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
69 const struct nf_conntrack_tuple *tuple,
70 const struct nf_conntrack_l4proto *l4proto)
71 {
72 int ret = 0;
73 struct nlattr *nest_parms;
74
75 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO);
76 if (!nest_parms)
77 goto nla_put_failure;
78 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
79 goto nla_put_failure;
80
81 if (likely(l4proto->tuple_to_nlattr))
82 ret = l4proto->tuple_to_nlattr(skb, tuple);
83
84 nla_nest_end(skb, nest_parms);
85
86 return ret;
87
88 nla_put_failure:
89 return -1;
90 }
91
ipv4_tuple_to_nlattr(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple)92 static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
93 const struct nf_conntrack_tuple *tuple)
94 {
95 if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
96 nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
97 return -EMSGSIZE;
98 return 0;
99 }
100
ipv6_tuple_to_nlattr(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple)101 static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
102 const struct nf_conntrack_tuple *tuple)
103 {
104 if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
105 nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
106 return -EMSGSIZE;
107 return 0;
108 }
109
ctnetlink_dump_tuples_ip(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple)110 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
111 const struct nf_conntrack_tuple *tuple)
112 {
113 int ret = 0;
114 struct nlattr *nest_parms;
115
116 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP);
117 if (!nest_parms)
118 goto nla_put_failure;
119
120 switch (tuple->src.l3num) {
121 case NFPROTO_IPV4:
122 ret = ipv4_tuple_to_nlattr(skb, tuple);
123 break;
124 case NFPROTO_IPV6:
125 ret = ipv6_tuple_to_nlattr(skb, tuple);
126 break;
127 }
128
129 nla_nest_end(skb, nest_parms);
130
131 return ret;
132
133 nla_put_failure:
134 return -1;
135 }
136
ctnetlink_dump_tuples(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple)137 static int ctnetlink_dump_tuples(struct sk_buff *skb,
138 const struct nf_conntrack_tuple *tuple)
139 {
140 const struct nf_conntrack_l4proto *l4proto;
141 int ret;
142
143 rcu_read_lock();
144 ret = ctnetlink_dump_tuples_ip(skb, tuple);
145
146 if (ret >= 0) {
147 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
148 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
149 }
150 rcu_read_unlock();
151 return ret;
152 }
153
ctnetlink_dump_zone_id(struct sk_buff * skb,int attrtype,const struct nf_conntrack_zone * zone,int dir)154 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
155 const struct nf_conntrack_zone *zone, int dir)
156 {
157 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
158 return 0;
159 if (nla_put_be16(skb, attrtype, htons(zone->id)))
160 goto nla_put_failure;
161 return 0;
162
163 nla_put_failure:
164 return -1;
165 }
166
ctnetlink_dump_status(struct sk_buff * skb,const struct nf_conn * ct)167 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
168 {
169 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
170 goto nla_put_failure;
171 return 0;
172
173 nla_put_failure:
174 return -1;
175 }
176
ctnetlink_dump_timeout(struct sk_buff * skb,const struct nf_conn * ct,bool skip_zero)177 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct,
178 bool skip_zero)
179 {
180 long timeout;
181
182 if (nf_ct_is_confirmed(ct))
183 timeout = nf_ct_expires(ct) / HZ;
184 else
185 timeout = ct->timeout / HZ;
186
187 if (skip_zero && timeout == 0)
188 return 0;
189
190 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
191 goto nla_put_failure;
192 return 0;
193
194 nla_put_failure:
195 return -1;
196 }
197
ctnetlink_dump_protoinfo(struct sk_buff * skb,struct nf_conn * ct,bool destroy)198 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct,
199 bool destroy)
200 {
201 const struct nf_conntrack_l4proto *l4proto;
202 struct nlattr *nest_proto;
203 int ret;
204
205 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
206 if (!l4proto->to_nlattr)
207 return 0;
208
209 nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
210 if (!nest_proto)
211 goto nla_put_failure;
212
213 ret = l4proto->to_nlattr(skb, nest_proto, ct, destroy);
214
215 nla_nest_end(skb, nest_proto);
216
217 return ret;
218
219 nla_put_failure:
220 return -1;
221 }
222
ctnetlink_dump_helpinfo(struct sk_buff * skb,const struct nf_conn * ct)223 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
224 const struct nf_conn *ct)
225 {
226 struct nlattr *nest_helper;
227 const struct nf_conn_help *help = nfct_help(ct);
228 struct nf_conntrack_helper *helper;
229
230 if (!help)
231 return 0;
232
233 rcu_read_lock();
234 helper = rcu_dereference(help->helper);
235 if (!helper)
236 goto out;
237
238 nest_helper = nla_nest_start(skb, CTA_HELP);
239 if (!nest_helper)
240 goto nla_put_failure;
241 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
242 goto nla_put_failure;
243
244 if (helper->to_nlattr)
245 helper->to_nlattr(skb, ct);
246
247 nla_nest_end(skb, nest_helper);
248 out:
249 rcu_read_unlock();
250 return 0;
251
252 nla_put_failure:
253 rcu_read_unlock();
254 return -1;
255 }
256
257 static int
dump_counters(struct sk_buff * skb,struct nf_conn_acct * acct,enum ip_conntrack_dir dir,int type)258 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
259 enum ip_conntrack_dir dir, int type)
260 {
261 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
262 struct nf_conn_counter *counter = acct->counter;
263 struct nlattr *nest_count;
264 u64 pkts, bytes;
265
266 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
267 pkts = atomic64_xchg(&counter[dir].packets, 0);
268 bytes = atomic64_xchg(&counter[dir].bytes, 0);
269 } else {
270 pkts = atomic64_read(&counter[dir].packets);
271 bytes = atomic64_read(&counter[dir].bytes);
272 }
273
274 nest_count = nla_nest_start(skb, attr);
275 if (!nest_count)
276 goto nla_put_failure;
277
278 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
279 CTA_COUNTERS_PAD) ||
280 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
281 CTA_COUNTERS_PAD))
282 goto nla_put_failure;
283
284 nla_nest_end(skb, nest_count);
285
286 return 0;
287
288 nla_put_failure:
289 return -1;
290 }
291
292 static int
ctnetlink_dump_acct(struct sk_buff * skb,const struct nf_conn * ct,int type)293 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
294 {
295 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
296
297 if (!acct)
298 return 0;
299
300 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
301 return -1;
302 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
303 return -1;
304
305 return 0;
306 }
307
308 static int
ctnetlink_dump_timestamp(struct sk_buff * skb,const struct nf_conn * ct)309 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
310 {
311 struct nlattr *nest_count;
312 const struct nf_conn_tstamp *tstamp;
313
314 tstamp = nf_conn_tstamp_find(ct);
315 if (!tstamp)
316 return 0;
317
318 nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
319 if (!nest_count)
320 goto nla_put_failure;
321
322 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
323 CTA_TIMESTAMP_PAD) ||
324 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
325 cpu_to_be64(tstamp->stop),
326 CTA_TIMESTAMP_PAD)))
327 goto nla_put_failure;
328 nla_nest_end(skb, nest_count);
329
330 return 0;
331
332 nla_put_failure:
333 return -1;
334 }
335
336 #ifdef CONFIG_NF_CONNTRACK_MARK
ctnetlink_dump_mark(struct sk_buff * skb,const struct nf_conn * ct,bool dump)337 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct,
338 bool dump)
339 {
340 u32 mark = READ_ONCE(ct->mark);
341
342 if (!mark && !dump)
343 return 0;
344
345 if (nla_put_be32(skb, CTA_MARK, htonl(mark)))
346 goto nla_put_failure;
347 return 0;
348
349 nla_put_failure:
350 return -1;
351 }
352 #else
353 #define ctnetlink_dump_mark(a, b, c) (0)
354 #endif
355
356 #ifdef CONFIG_NF_CONNTRACK_SECMARK
ctnetlink_dump_secctx(struct sk_buff * skb,const struct nf_conn * ct)357 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
358 {
359 struct nlattr *nest_secctx;
360 struct lsm_context ctx;
361 int ret;
362
363 ret = security_secid_to_secctx(ct->secmark, &ctx);
364 if (ret < 0)
365 return 0;
366
367 ret = -1;
368 nest_secctx = nla_nest_start(skb, CTA_SECCTX);
369 if (!nest_secctx)
370 goto nla_put_failure;
371
372 if (nla_put_string(skb, CTA_SECCTX_NAME, ctx.context))
373 goto nla_put_failure;
374 nla_nest_end(skb, nest_secctx);
375
376 ret = 0;
377 nla_put_failure:
378 security_release_secctx(&ctx);
379 return ret;
380 }
381 #else
382 #define ctnetlink_dump_secctx(a, b) (0)
383 #endif
384
385 #ifdef CONFIG_NF_CONNTRACK_EVENTS
386 static int
ctnetlink_dump_event_timestamp(struct sk_buff * skb,const struct nf_conn * ct)387 ctnetlink_dump_event_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
388 {
389 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
390 const struct nf_conntrack_ecache *e = nf_ct_ecache_find(ct);
391
392 if (e) {
393 u64 ts = local64_read(&e->timestamp);
394
395 if (ts)
396 return nla_put_be64(skb, CTA_TIMESTAMP_EVENT,
397 cpu_to_be64(ts), CTA_TIMESTAMP_PAD);
398 }
399 #endif
400 return 0;
401 }
402
ctnetlink_label_size(const struct nf_conn * ct)403 static inline int ctnetlink_label_size(const struct nf_conn *ct)
404 {
405 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
406
407 if (!labels)
408 return 0;
409 return nla_total_size(sizeof(labels->bits));
410 }
411 #endif
412
413 static int
ctnetlink_dump_labels(struct sk_buff * skb,const struct nf_conn * ct)414 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
415 {
416 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
417 unsigned int i;
418
419 if (!labels)
420 return 0;
421
422 i = 0;
423 do {
424 if (labels->bits[i] != 0)
425 return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
426 labels->bits);
427 i++;
428 } while (i < ARRAY_SIZE(labels->bits));
429
430 return 0;
431 }
432
433 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
434
ctnetlink_dump_master(struct sk_buff * skb,const struct nf_conn * ct)435 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
436 {
437 struct nlattr *nest_parms;
438
439 if (!(ct->status & IPS_EXPECTED))
440 return 0;
441
442 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
443 if (!nest_parms)
444 goto nla_put_failure;
445 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
446 goto nla_put_failure;
447 nla_nest_end(skb, nest_parms);
448
449 return 0;
450
451 nla_put_failure:
452 return -1;
453 }
454
455 static int
dump_ct_seq_adj(struct sk_buff * skb,const struct nf_ct_seqadj * seq,int type)456 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
457 {
458 struct nlattr *nest_parms;
459
460 nest_parms = nla_nest_start(skb, type);
461 if (!nest_parms)
462 goto nla_put_failure;
463
464 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
465 htonl(seq->correction_pos)) ||
466 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
467 htonl(seq->offset_before)) ||
468 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
469 htonl(seq->offset_after)))
470 goto nla_put_failure;
471
472 nla_nest_end(skb, nest_parms);
473
474 return 0;
475
476 nla_put_failure:
477 return -1;
478 }
479
ctnetlink_dump_ct_seq_adj(struct sk_buff * skb,struct nf_conn * ct)480 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
481 {
482 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
483 struct nf_ct_seqadj *seq;
484
485 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
486 return 0;
487
488 spin_lock_bh(&ct->lock);
489 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
490 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
491 goto err;
492
493 seq = &seqadj->seq[IP_CT_DIR_REPLY];
494 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
495 goto err;
496
497 spin_unlock_bh(&ct->lock);
498 return 0;
499 err:
500 spin_unlock_bh(&ct->lock);
501 return -1;
502 }
503
ctnetlink_dump_ct_synproxy(struct sk_buff * skb,struct nf_conn * ct)504 static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
505 {
506 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
507 struct nlattr *nest_parms;
508
509 if (!synproxy)
510 return 0;
511
512 nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
513 if (!nest_parms)
514 goto nla_put_failure;
515
516 if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
517 nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
518 nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
519 goto nla_put_failure;
520
521 nla_nest_end(skb, nest_parms);
522
523 return 0;
524
525 nla_put_failure:
526 return -1;
527 }
528
ctnetlink_dump_id(struct sk_buff * skb,const struct nf_conn * ct)529 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
530 {
531 __be32 id = (__force __be32)nf_ct_get_id(ct);
532
533 if (nla_put_be32(skb, CTA_ID, id))
534 goto nla_put_failure;
535 return 0;
536
537 nla_put_failure:
538 return -1;
539 }
540
ctnetlink_dump_use(struct sk_buff * skb,const struct nf_conn * ct)541 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
542 {
543 if (nla_put_be32(skb, CTA_USE, htonl(refcount_read(&ct->ct_general.use))))
544 goto nla_put_failure;
545 return 0;
546
547 nla_put_failure:
548 return -1;
549 }
550
551 /* all these functions access ct->ext. Caller must either hold a reference
552 * on ct or prevent its deletion by holding either the bucket spinlock or
553 * pcpu dying list lock.
554 */
ctnetlink_dump_extinfo(struct sk_buff * skb,struct nf_conn * ct,u32 type)555 static int ctnetlink_dump_extinfo(struct sk_buff *skb,
556 struct nf_conn *ct, u32 type)
557 {
558 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
559 ctnetlink_dump_timestamp(skb, ct) < 0 ||
560 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
561 ctnetlink_dump_labels(skb, ct) < 0 ||
562 ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
563 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
564 return -1;
565
566 return 0;
567 }
568
ctnetlink_dump_info(struct sk_buff * skb,struct nf_conn * ct)569 static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
570 {
571 if (ctnetlink_dump_status(skb, ct) < 0 ||
572 ctnetlink_dump_mark(skb, ct, true) < 0 ||
573 ctnetlink_dump_secctx(skb, ct) < 0 ||
574 ctnetlink_dump_id(skb, ct) < 0 ||
575 ctnetlink_dump_use(skb, ct) < 0 ||
576 ctnetlink_dump_master(skb, ct) < 0)
577 return -1;
578
579 if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
580 (ctnetlink_dump_timeout(skb, ct, false) < 0 ||
581 ctnetlink_dump_protoinfo(skb, ct, false) < 0))
582 return -1;
583
584 return 0;
585 }
586
587 static int
ctnetlink_fill_info(struct sk_buff * skb,u32 portid,u32 seq,u32 type,struct nf_conn * ct,bool extinfo,unsigned int flags)588 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
589 struct nf_conn *ct, bool extinfo, unsigned int flags)
590 {
591 const struct nf_conntrack_zone *zone;
592 struct nlmsghdr *nlh;
593 struct nlattr *nest_parms;
594 unsigned int event;
595
596 if (portid)
597 flags |= NLM_F_MULTI;
598 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
599 nlh = nfnl_msg_put(skb, portid, seq, event, flags, nf_ct_l3num(ct),
600 NFNETLINK_V0, 0);
601 if (!nlh)
602 goto nlmsg_failure;
603
604 zone = nf_ct_zone(ct);
605
606 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
607 if (!nest_parms)
608 goto nla_put_failure;
609 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
610 goto nla_put_failure;
611 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
612 NF_CT_ZONE_DIR_ORIG) < 0)
613 goto nla_put_failure;
614 nla_nest_end(skb, nest_parms);
615
616 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
617 if (!nest_parms)
618 goto nla_put_failure;
619 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
620 goto nla_put_failure;
621 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
622 NF_CT_ZONE_DIR_REPL) < 0)
623 goto nla_put_failure;
624 nla_nest_end(skb, nest_parms);
625
626 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
627 NF_CT_DEFAULT_ZONE_DIR) < 0)
628 goto nla_put_failure;
629
630 if (ctnetlink_dump_info(skb, ct) < 0)
631 goto nla_put_failure;
632 if (extinfo && ctnetlink_dump_extinfo(skb, ct, type) < 0)
633 goto nla_put_failure;
634
635 nlmsg_end(skb, nlh);
636 return skb->len;
637
638 nlmsg_failure:
639 nla_put_failure:
640 nlmsg_cancel(skb, nlh);
641 return -1;
642 }
643
644 static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
645 [CTA_IP_V4_SRC] = { .type = NLA_U32 },
646 [CTA_IP_V4_DST] = { .type = NLA_U32 },
647 [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
648 [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
649 };
650
651 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
ctnetlink_proto_size(const struct nf_conn * ct)652 static size_t ctnetlink_proto_size(const struct nf_conn *ct)
653 {
654 const struct nf_conntrack_l4proto *l4proto;
655 size_t len, len4 = 0;
656
657 len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
658 len *= 3u; /* ORIG, REPLY, MASTER */
659
660 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
661 len += l4proto->nlattr_size;
662 if (l4proto->nlattr_tuple_size) {
663 len4 = l4proto->nlattr_tuple_size();
664 len4 *= 3u; /* ORIG, REPLY, MASTER */
665 }
666
667 return len + len4;
668 }
669
ctnetlink_acct_size(const struct nf_conn * ct)670 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
671 {
672 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
673 return 0;
674 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
675 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
676 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
677 ;
678 }
679
ctnetlink_secctx_size(const struct nf_conn * ct)680 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
681 {
682 #ifdef CONFIG_NF_CONNTRACK_SECMARK
683 int ret;
684
685 ret = security_secid_to_secctx(ct->secmark, NULL);
686 if (ret < 0)
687 return 0;
688
689 return nla_total_size(0) /* CTA_SECCTX */
690 + nla_total_size(sizeof(char) * ret); /* CTA_SECCTX_NAME */
691 #else
692 return 0;
693 #endif
694 }
695
ctnetlink_timestamp_size(const struct nf_conn * ct)696 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
697 {
698 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
699 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
700 return 0;
701 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
702 #else
703 return 0;
704 #endif
705 }
706 #endif
707
708 #ifdef CONFIG_NF_CONNTRACK_EVENTS
ctnetlink_nlmsg_size(const struct nf_conn * ct)709 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
710 {
711 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
712 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
713 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
714 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
715 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
716 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
717 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
718 + ctnetlink_acct_size(ct)
719 + ctnetlink_timestamp_size(ct)
720 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
721 + nla_total_size(0) /* CTA_PROTOINFO */
722 + nla_total_size(0) /* CTA_HELP */
723 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
724 + ctnetlink_secctx_size(ct)
725 #if IS_ENABLED(CONFIG_NF_NAT)
726 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
727 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
728 #endif
729 #ifdef CONFIG_NF_CONNTRACK_MARK
730 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
731 #endif
732 #ifdef CONFIG_NF_CONNTRACK_ZONES
733 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
734 #endif
735 + ctnetlink_proto_size(ct)
736 + ctnetlink_label_size(ct)
737 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
738 + nla_total_size(sizeof(u64)) /* CTA_TIMESTAMP_EVENT */
739 #endif
740 ;
741 }
742
743 static int
ctnetlink_conntrack_event(unsigned int events,const struct nf_ct_event * item)744 ctnetlink_conntrack_event(unsigned int events, const struct nf_ct_event *item)
745 {
746 const struct nf_conntrack_zone *zone;
747 struct net *net;
748 struct nlmsghdr *nlh;
749 struct nlattr *nest_parms;
750 struct nf_conn *ct = item->ct;
751 struct sk_buff *skb;
752 unsigned int type;
753 unsigned int flags = 0, group;
754 int err;
755
756 if (events & (1 << IPCT_DESTROY)) {
757 type = IPCTNL_MSG_CT_DELETE;
758 group = NFNLGRP_CONNTRACK_DESTROY;
759 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
760 type = IPCTNL_MSG_CT_NEW;
761 flags = NLM_F_CREATE|NLM_F_EXCL;
762 group = NFNLGRP_CONNTRACK_NEW;
763 } else if (events) {
764 type = IPCTNL_MSG_CT_NEW;
765 group = NFNLGRP_CONNTRACK_UPDATE;
766 } else
767 return 0;
768
769 net = nf_ct_net(ct);
770 if (!item->report && !nfnetlink_has_listeners(net, group))
771 return 0;
772
773 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
774 if (skb == NULL)
775 goto errout;
776
777 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
778 nlh = nfnl_msg_put(skb, item->portid, 0, type, flags, nf_ct_l3num(ct),
779 NFNETLINK_V0, 0);
780 if (!nlh)
781 goto nlmsg_failure;
782
783 zone = nf_ct_zone(ct);
784
785 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
786 if (!nest_parms)
787 goto nla_put_failure;
788 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
789 goto nla_put_failure;
790 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
791 NF_CT_ZONE_DIR_ORIG) < 0)
792 goto nla_put_failure;
793 nla_nest_end(skb, nest_parms);
794
795 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
796 if (!nest_parms)
797 goto nla_put_failure;
798 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
799 goto nla_put_failure;
800 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
801 NF_CT_ZONE_DIR_REPL) < 0)
802 goto nla_put_failure;
803 nla_nest_end(skb, nest_parms);
804
805 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
806 NF_CT_DEFAULT_ZONE_DIR) < 0)
807 goto nla_put_failure;
808
809 if (ctnetlink_dump_id(skb, ct) < 0)
810 goto nla_put_failure;
811
812 if (ctnetlink_dump_status(skb, ct) < 0)
813 goto nla_put_failure;
814
815 if (events & (1 << IPCT_DESTROY)) {
816 if (ctnetlink_dump_timeout(skb, ct, true) < 0)
817 goto nla_put_failure;
818
819 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
820 ctnetlink_dump_timestamp(skb, ct) < 0 ||
821 ctnetlink_dump_protoinfo(skb, ct, true) < 0)
822 goto nla_put_failure;
823 } else {
824 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
825 goto nla_put_failure;
826
827 if (events & (1 << IPCT_PROTOINFO) &&
828 ctnetlink_dump_protoinfo(skb, ct, false) < 0)
829 goto nla_put_failure;
830
831 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
832 && ctnetlink_dump_helpinfo(skb, ct) < 0)
833 goto nla_put_failure;
834
835 #ifdef CONFIG_NF_CONNTRACK_SECMARK
836 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
837 && ctnetlink_dump_secctx(skb, ct) < 0)
838 goto nla_put_failure;
839 #endif
840 if (events & (1 << IPCT_LABEL) &&
841 ctnetlink_dump_labels(skb, ct) < 0)
842 goto nla_put_failure;
843
844 if (events & (1 << IPCT_RELATED) &&
845 ctnetlink_dump_master(skb, ct) < 0)
846 goto nla_put_failure;
847
848 if (events & (1 << IPCT_SEQADJ) &&
849 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
850 goto nla_put_failure;
851
852 if (events & (1 << IPCT_SYNPROXY) &&
853 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
854 goto nla_put_failure;
855 }
856
857 #ifdef CONFIG_NF_CONNTRACK_MARK
858 if (ctnetlink_dump_mark(skb, ct, events & (1 << IPCT_MARK)))
859 goto nla_put_failure;
860 #endif
861
862 if (ctnetlink_dump_event_timestamp(skb, ct))
863 goto nla_put_failure;
864
865 nlmsg_end(skb, nlh);
866 err = nfnetlink_send(skb, net, item->portid, group, item->report,
867 GFP_ATOMIC);
868 if (err == -ENOBUFS || err == -EAGAIN)
869 return -ENOBUFS;
870
871 return 0;
872
873 nla_put_failure:
874 nlmsg_cancel(skb, nlh);
875 nlmsg_failure:
876 kfree_skb(skb);
877 errout:
878 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
879 return -ENOBUFS;
880
881 return 0;
882 }
883 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
884
ctnetlink_done(struct netlink_callback * cb)885 static int ctnetlink_done(struct netlink_callback *cb)
886 {
887 kfree(cb->data);
888 return 0;
889 }
890
891 struct ctnetlink_filter_u32 {
892 u32 val;
893 u32 mask;
894 };
895
896 struct ctnetlink_filter {
897 u8 family;
898 bool zone_filter;
899
900 u_int32_t orig_flags;
901 u_int32_t reply_flags;
902
903 struct nf_conntrack_tuple orig;
904 struct nf_conntrack_tuple reply;
905 struct nf_conntrack_zone zone;
906
907 struct ctnetlink_filter_u32 mark;
908 struct ctnetlink_filter_u32 status;
909 };
910
911 static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
912 [CTA_FILTER_ORIG_FLAGS] = { .type = NLA_U32 },
913 [CTA_FILTER_REPLY_FLAGS] = { .type = NLA_U32 },
914 };
915
ctnetlink_parse_filter(const struct nlattr * attr,struct ctnetlink_filter * filter)916 static int ctnetlink_parse_filter(const struct nlattr *attr,
917 struct ctnetlink_filter *filter)
918 {
919 struct nlattr *tb[CTA_FILTER_MAX + 1];
920 int ret = 0;
921
922 ret = nla_parse_nested(tb, CTA_FILTER_MAX, attr, cta_filter_nla_policy,
923 NULL);
924 if (ret)
925 return ret;
926
927 if (tb[CTA_FILTER_ORIG_FLAGS]) {
928 filter->orig_flags = nla_get_u32(tb[CTA_FILTER_ORIG_FLAGS]);
929 if (filter->orig_flags & ~CTA_FILTER_F_ALL)
930 return -EOPNOTSUPP;
931 }
932
933 if (tb[CTA_FILTER_REPLY_FLAGS]) {
934 filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
935 if (filter->reply_flags & ~CTA_FILTER_F_ALL)
936 return -EOPNOTSUPP;
937 }
938
939 return 0;
940 }
941
942 static int ctnetlink_parse_zone(const struct nlattr *attr,
943 struct nf_conntrack_zone *zone);
944 static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
945 struct nf_conntrack_tuple *tuple,
946 u32 type, u_int8_t l3num,
947 struct nf_conntrack_zone *zone,
948 u_int32_t flags);
949
ctnetlink_filter_parse_mark(struct ctnetlink_filter_u32 * mark,const struct nlattr * const cda[])950 static int ctnetlink_filter_parse_mark(struct ctnetlink_filter_u32 *mark,
951 const struct nlattr * const cda[])
952 {
953 #ifdef CONFIG_NF_CONNTRACK_MARK
954 if (cda[CTA_MARK]) {
955 mark->val = ntohl(nla_get_be32(cda[CTA_MARK]));
956
957 if (cda[CTA_MARK_MASK])
958 mark->mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
959 else
960 mark->mask = 0xffffffff;
961 } else if (cda[CTA_MARK_MASK]) {
962 return -EINVAL;
963 }
964 #endif
965 return 0;
966 }
967
ctnetlink_filter_parse_status(struct ctnetlink_filter_u32 * status,const struct nlattr * const cda[])968 static int ctnetlink_filter_parse_status(struct ctnetlink_filter_u32 *status,
969 const struct nlattr * const cda[])
970 {
971 if (cda[CTA_STATUS]) {
972 status->val = ntohl(nla_get_be32(cda[CTA_STATUS]));
973 if (cda[CTA_STATUS_MASK])
974 status->mask = ntohl(nla_get_be32(cda[CTA_STATUS_MASK]));
975 else
976 status->mask = status->val;
977
978 /* status->val == 0? always true, else always false. */
979 if (status->mask == 0)
980 return -EINVAL;
981 } else if (cda[CTA_STATUS_MASK]) {
982 return -EINVAL;
983 }
984
985 /* CTA_STATUS is NLA_U32, if this fires UAPI needs to be extended */
986 BUILD_BUG_ON(__IPS_MAX_BIT >= 32);
987 return 0;
988 }
989
990 static struct ctnetlink_filter *
ctnetlink_alloc_filter(const struct nlattr * const cda[],u8 family)991 ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
992 {
993 struct ctnetlink_filter *filter;
994 int err;
995
996 #ifndef CONFIG_NF_CONNTRACK_MARK
997 if (cda[CTA_MARK] || cda[CTA_MARK_MASK])
998 return ERR_PTR(-EOPNOTSUPP);
999 #endif
1000
1001 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
1002 if (filter == NULL)
1003 return ERR_PTR(-ENOMEM);
1004
1005 filter->family = family;
1006
1007 err = ctnetlink_filter_parse_mark(&filter->mark, cda);
1008 if (err)
1009 goto err_filter;
1010
1011 err = ctnetlink_filter_parse_status(&filter->status, cda);
1012 if (err)
1013 goto err_filter;
1014
1015 if (cda[CTA_ZONE]) {
1016 err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
1017 if (err < 0)
1018 goto err_filter;
1019 filter->zone_filter = true;
1020 }
1021
1022 if (!cda[CTA_FILTER])
1023 return filter;
1024
1025 err = ctnetlink_parse_filter(cda[CTA_FILTER], filter);
1026 if (err < 0)
1027 goto err_filter;
1028
1029 if (filter->orig_flags) {
1030 if (!cda[CTA_TUPLE_ORIG]) {
1031 err = -EINVAL;
1032 goto err_filter;
1033 }
1034
1035 err = ctnetlink_parse_tuple_filter(cda, &filter->orig,
1036 CTA_TUPLE_ORIG,
1037 filter->family,
1038 &filter->zone,
1039 filter->orig_flags);
1040 if (err < 0)
1041 goto err_filter;
1042 }
1043
1044 if (filter->reply_flags) {
1045 if (!cda[CTA_TUPLE_REPLY]) {
1046 err = -EINVAL;
1047 goto err_filter;
1048 }
1049
1050 err = ctnetlink_parse_tuple_filter(cda, &filter->reply,
1051 CTA_TUPLE_REPLY,
1052 filter->family,
1053 &filter->zone,
1054 filter->reply_flags);
1055 if (err < 0)
1056 goto err_filter;
1057 }
1058
1059 return filter;
1060
1061 err_filter:
1062 kfree(filter);
1063
1064 return ERR_PTR(err);
1065 }
1066
ctnetlink_needs_filter(u8 family,const struct nlattr * const * cda)1067 static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
1068 {
1069 return family || cda[CTA_MARK] || cda[CTA_FILTER] || cda[CTA_STATUS] || cda[CTA_ZONE];
1070 }
1071
ctnetlink_start(struct netlink_callback * cb)1072 static int ctnetlink_start(struct netlink_callback *cb)
1073 {
1074 const struct nlattr * const *cda = cb->data;
1075 struct ctnetlink_filter *filter = NULL;
1076 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1077 u8 family = nfmsg->nfgen_family;
1078
1079 if (ctnetlink_needs_filter(family, cda)) {
1080 filter = ctnetlink_alloc_filter(cda, family);
1081 if (IS_ERR(filter))
1082 return PTR_ERR(filter);
1083 }
1084
1085 cb->data = filter;
1086 return 0;
1087 }
1088
ctnetlink_filter_match_tuple(struct nf_conntrack_tuple * filter_tuple,struct nf_conntrack_tuple * ct_tuple,u_int32_t flags,int family)1089 static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
1090 struct nf_conntrack_tuple *ct_tuple,
1091 u_int32_t flags, int family)
1092 {
1093 switch (family) {
1094 case NFPROTO_IPV4:
1095 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1096 filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
1097 return 0;
1098
1099 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1100 filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
1101 return 0;
1102 break;
1103 case NFPROTO_IPV6:
1104 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1105 !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
1106 &ct_tuple->src.u3.in6))
1107 return 0;
1108
1109 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1110 !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
1111 &ct_tuple->dst.u3.in6))
1112 return 0;
1113 break;
1114 }
1115
1116 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
1117 filter_tuple->dst.protonum != ct_tuple->dst.protonum)
1118 return 0;
1119
1120 switch (ct_tuple->dst.protonum) {
1121 case IPPROTO_TCP:
1122 case IPPROTO_UDP:
1123 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
1124 filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
1125 return 0;
1126
1127 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
1128 filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
1129 return 0;
1130 break;
1131 case IPPROTO_ICMP:
1132 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
1133 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1134 return 0;
1135 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
1136 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1137 return 0;
1138 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
1139 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1140 return 0;
1141 break;
1142 case IPPROTO_ICMPV6:
1143 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
1144 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1145 return 0;
1146 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
1147 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1148 return 0;
1149 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
1150 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1151 return 0;
1152 break;
1153 }
1154
1155 return 1;
1156 }
1157
ctnetlink_filter_match(struct nf_conn * ct,void * data)1158 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
1159 {
1160 struct ctnetlink_filter *filter = data;
1161 struct nf_conntrack_tuple *tuple;
1162 u32 status;
1163
1164 if (filter == NULL)
1165 goto out;
1166
1167 /* Match entries of a given L3 protocol number.
1168 * If it is not specified, ie. l3proto == 0,
1169 * then match everything.
1170 */
1171 if (filter->family && nf_ct_l3num(ct) != filter->family)
1172 goto ignore_entry;
1173
1174 if (filter->zone_filter &&
1175 !nf_ct_zone_equal_any(ct, &filter->zone))
1176 goto ignore_entry;
1177
1178 if (filter->orig_flags) {
1179 tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
1180 if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
1181 filter->orig_flags,
1182 filter->family))
1183 goto ignore_entry;
1184 }
1185
1186 if (filter->reply_flags) {
1187 tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
1188 if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
1189 filter->reply_flags,
1190 filter->family))
1191 goto ignore_entry;
1192 }
1193
1194 #ifdef CONFIG_NF_CONNTRACK_MARK
1195 if ((READ_ONCE(ct->mark) & filter->mark.mask) != filter->mark.val)
1196 goto ignore_entry;
1197 #endif
1198 status = (u32)READ_ONCE(ct->status);
1199 if ((status & filter->status.mask) != filter->status.val)
1200 goto ignore_entry;
1201
1202 out:
1203 return 1;
1204
1205 ignore_entry:
1206 return 0;
1207 }
1208
ctnetlink_get_id(const struct nf_conn * ct)1209 static unsigned long ctnetlink_get_id(const struct nf_conn *ct)
1210 {
1211 unsigned long id = nf_ct_get_id(ct);
1212
1213 return id ? id : 1;
1214 }
1215
1216 static int
ctnetlink_dump_table(struct sk_buff * skb,struct netlink_callback * cb)1217 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1218 {
1219 unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
1220 struct net *net = sock_net(skb->sk);
1221 unsigned long last_id = cb->args[1];
1222 struct nf_conntrack_tuple_hash *h;
1223 struct hlist_nulls_node *n;
1224 struct nf_conn *nf_ct_evict[8];
1225 struct nf_conn *ct;
1226 int res, i;
1227 spinlock_t *lockp;
1228
1229 i = 0;
1230
1231 local_bh_disable();
1232 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
1233 restart:
1234 while (i) {
1235 i--;
1236 if (nf_ct_should_gc(nf_ct_evict[i]))
1237 nf_ct_kill(nf_ct_evict[i]);
1238 nf_ct_put(nf_ct_evict[i]);
1239 }
1240
1241 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
1242 nf_conntrack_lock(lockp);
1243 if (cb->args[0] >= nf_conntrack_htable_size) {
1244 spin_unlock(lockp);
1245 goto out;
1246 }
1247 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
1248 hnnode) {
1249 ct = nf_ct_tuplehash_to_ctrack(h);
1250 if (nf_ct_is_expired(ct)) {
1251 /* need to defer nf_ct_kill() until lock is released */
1252 if (i < ARRAY_SIZE(nf_ct_evict) &&
1253 refcount_inc_not_zero(&ct->ct_general.use))
1254 nf_ct_evict[i++] = ct;
1255 continue;
1256 }
1257
1258 if (!net_eq(net, nf_ct_net(ct)))
1259 continue;
1260
1261 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
1262 continue;
1263
1264 if (cb->args[1]) {
1265 if (ctnetlink_get_id(ct) != last_id)
1266 continue;
1267 cb->args[1] = 0;
1268 }
1269 if (!ctnetlink_filter_match(ct, cb->data))
1270 continue;
1271
1272 res =
1273 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1274 cb->nlh->nlmsg_seq,
1275 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1276 ct, true, flags);
1277 if (res < 0) {
1278 cb->args[1] = ctnetlink_get_id(ct);
1279 spin_unlock(lockp);
1280 goto out;
1281 }
1282 }
1283 spin_unlock(lockp);
1284 if (cb->args[1]) {
1285 cb->args[1] = 0;
1286 goto restart;
1287 }
1288 }
1289 out:
1290 local_bh_enable();
1291 if (last_id) {
1292 /* nf ct hash resize happened, now clear the leftover. */
1293 if (cb->args[1] == last_id)
1294 cb->args[1] = 0;
1295 }
1296
1297 while (i) {
1298 i--;
1299 if (nf_ct_should_gc(nf_ct_evict[i]))
1300 nf_ct_kill(nf_ct_evict[i]);
1301 nf_ct_put(nf_ct_evict[i]);
1302 }
1303
1304 return skb->len;
1305 }
1306
ipv4_nlattr_to_tuple(struct nlattr * tb[],struct nf_conntrack_tuple * t,u_int32_t flags)1307 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
1308 struct nf_conntrack_tuple *t,
1309 u_int32_t flags)
1310 {
1311 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1312 if (!tb[CTA_IP_V4_SRC])
1313 return -EINVAL;
1314
1315 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1316 }
1317
1318 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1319 if (!tb[CTA_IP_V4_DST])
1320 return -EINVAL;
1321
1322 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1323 }
1324
1325 return 0;
1326 }
1327
ipv6_nlattr_to_tuple(struct nlattr * tb[],struct nf_conntrack_tuple * t,u_int32_t flags)1328 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1329 struct nf_conntrack_tuple *t,
1330 u_int32_t flags)
1331 {
1332 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1333 if (!tb[CTA_IP_V6_SRC])
1334 return -EINVAL;
1335
1336 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1337 }
1338
1339 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1340 if (!tb[CTA_IP_V6_DST])
1341 return -EINVAL;
1342
1343 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1344 }
1345
1346 return 0;
1347 }
1348
ctnetlink_parse_tuple_ip(struct nlattr * attr,struct nf_conntrack_tuple * tuple,u_int32_t flags)1349 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1350 struct nf_conntrack_tuple *tuple,
1351 u_int32_t flags)
1352 {
1353 struct nlattr *tb[CTA_IP_MAX+1];
1354 int ret = 0;
1355
1356 ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr,
1357 cta_ip_nla_policy, NULL);
1358 if (ret < 0)
1359 return ret;
1360
1361 switch (tuple->src.l3num) {
1362 case NFPROTO_IPV4:
1363 ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
1364 break;
1365 case NFPROTO_IPV6:
1366 ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
1367 break;
1368 }
1369
1370 return ret;
1371 }
1372
1373 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1374 [CTA_PROTO_NUM] = { .type = NLA_U8 },
1375 };
1376
ctnetlink_parse_tuple_proto(struct nlattr * attr,struct nf_conntrack_tuple * tuple,u_int32_t flags)1377 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1378 struct nf_conntrack_tuple *tuple,
1379 u_int32_t flags)
1380 {
1381 const struct nf_conntrack_l4proto *l4proto;
1382 struct nlattr *tb[CTA_PROTO_MAX+1];
1383 int ret = 0;
1384
1385 ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1386 proto_nla_policy, NULL);
1387 if (ret < 0)
1388 return ret;
1389
1390 if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
1391 return 0;
1392
1393 if (!tb[CTA_PROTO_NUM])
1394 return -EINVAL;
1395
1396 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1397
1398 rcu_read_lock();
1399 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1400
1401 if (likely(l4proto->nlattr_to_tuple)) {
1402 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1403 l4proto->nla_policy,
1404 NULL);
1405 if (ret == 0)
1406 ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
1407 }
1408
1409 rcu_read_unlock();
1410
1411 return ret;
1412 }
1413
1414 static int
ctnetlink_parse_zone(const struct nlattr * attr,struct nf_conntrack_zone * zone)1415 ctnetlink_parse_zone(const struct nlattr *attr,
1416 struct nf_conntrack_zone *zone)
1417 {
1418 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1419 NF_CT_DEFAULT_ZONE_DIR, 0);
1420 #ifdef CONFIG_NF_CONNTRACK_ZONES
1421 if (attr)
1422 zone->id = ntohs(nla_get_be16(attr));
1423 #else
1424 if (attr)
1425 return -EOPNOTSUPP;
1426 #endif
1427 return 0;
1428 }
1429
1430 static int
ctnetlink_parse_tuple_zone(struct nlattr * attr,enum ctattr_type type,struct nf_conntrack_zone * zone)1431 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1432 struct nf_conntrack_zone *zone)
1433 {
1434 int ret;
1435
1436 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1437 return -EINVAL;
1438
1439 ret = ctnetlink_parse_zone(attr, zone);
1440 if (ret < 0)
1441 return ret;
1442
1443 if (type == CTA_TUPLE_REPLY)
1444 zone->dir = NF_CT_ZONE_DIR_REPL;
1445 else
1446 zone->dir = NF_CT_ZONE_DIR_ORIG;
1447
1448 return 0;
1449 }
1450
1451 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1452 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1453 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1454 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1455 };
1456
1457 #define CTA_FILTER_F_ALL_CTA_PROTO \
1458 (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
1459 CTA_FILTER_F_CTA_PROTO_DST_PORT | \
1460 CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
1461 CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
1462 CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
1463 CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
1464 CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
1465 CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
1466
1467 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)1468 ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
1469 struct nf_conntrack_tuple *tuple, u32 type,
1470 u_int8_t l3num, struct nf_conntrack_zone *zone,
1471 u_int32_t flags)
1472 {
1473 struct nlattr *tb[CTA_TUPLE_MAX+1];
1474 int err;
1475
1476 memset(tuple, 0, sizeof(*tuple));
1477
1478 err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1479 tuple_nla_policy, NULL);
1480 if (err < 0)
1481 return err;
1482
1483 if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1484 return -EOPNOTSUPP;
1485 tuple->src.l3num = l3num;
1486
1487 if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
1488 flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1489 if (!tb[CTA_TUPLE_IP])
1490 return -EINVAL;
1491
1492 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
1493 if (err < 0)
1494 return err;
1495 }
1496
1497 if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
1498 if (!tb[CTA_TUPLE_PROTO])
1499 return -EINVAL;
1500
1501 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
1502 if (err < 0)
1503 return err;
1504 } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
1505 /* Can't manage proto flags without a protonum */
1506 return -EINVAL;
1507 }
1508
1509 if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
1510 if (!zone)
1511 return -EINVAL;
1512
1513 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1514 type, zone);
1515 if (err < 0)
1516 return err;
1517 }
1518
1519 /* orig and expect tuples get DIR_ORIGINAL */
1520 if (type == CTA_TUPLE_REPLY)
1521 tuple->dst.dir = IP_CT_DIR_REPLY;
1522 else
1523 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1524
1525 return 0;
1526 }
1527
1528 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)1529 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1530 struct nf_conntrack_tuple *tuple, u32 type,
1531 u_int8_t l3num, struct nf_conntrack_zone *zone)
1532 {
1533 return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
1534 CTA_FILTER_FLAG(ALL));
1535 }
1536
1537 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1538 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1539 .len = NF_CT_HELPER_NAME_LEN - 1 },
1540 };
1541
ctnetlink_parse_help(const struct nlattr * attr,char ** helper_name,struct nlattr ** helpinfo)1542 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1543 struct nlattr **helpinfo)
1544 {
1545 int err;
1546 struct nlattr *tb[CTA_HELP_MAX+1];
1547
1548 err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1549 help_nla_policy, NULL);
1550 if (err < 0)
1551 return err;
1552
1553 if (!tb[CTA_HELP_NAME])
1554 return -EINVAL;
1555
1556 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1557
1558 if (tb[CTA_HELP_INFO])
1559 *helpinfo = tb[CTA_HELP_INFO];
1560
1561 return 0;
1562 }
1563
1564 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1565 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1566 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1567 [CTA_STATUS] = { .type = NLA_U32 },
1568 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1569 [CTA_HELP] = { .type = NLA_NESTED },
1570 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1571 [CTA_TIMEOUT] = { .type = NLA_U32 },
1572 [CTA_MARK] = { .type = NLA_U32 },
1573 [CTA_ID] = { .type = NLA_U32 },
1574 [CTA_NAT_DST] = { .type = NLA_NESTED },
1575 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1576 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1577 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1578 [CTA_ZONE] = { .type = NLA_U16 },
1579 [CTA_MARK_MASK] = { .type = NLA_U32 },
1580 [CTA_LABELS] = { .type = NLA_BINARY,
1581 .len = NF_CT_LABELS_MAX_SIZE },
1582 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1583 .len = NF_CT_LABELS_MAX_SIZE },
1584 [CTA_FILTER] = { .type = NLA_NESTED },
1585 [CTA_STATUS_MASK] = { .type = NLA_U32 },
1586 [CTA_TIMESTAMP_EVENT] = { .type = NLA_REJECT },
1587 };
1588
ctnetlink_flush_iterate(struct nf_conn * ct,void * data)1589 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1590 {
1591 return ctnetlink_filter_match(ct, data);
1592 }
1593
ctnetlink_flush_conntrack(struct net * net,const struct nlattr * const cda[],u32 portid,int report,u8 family)1594 static int ctnetlink_flush_conntrack(struct net *net,
1595 const struct nlattr * const cda[],
1596 u32 portid, int report, u8 family)
1597 {
1598 struct ctnetlink_filter *filter = NULL;
1599 struct nf_ct_iter_data iter = {
1600 .net = net,
1601 .portid = portid,
1602 .report = report,
1603 };
1604
1605 if (ctnetlink_needs_filter(family, cda)) {
1606 filter = ctnetlink_alloc_filter(cda, family);
1607 if (IS_ERR(filter))
1608 return PTR_ERR(filter);
1609
1610 iter.data = filter;
1611 }
1612
1613 nf_ct_iterate_cleanup_net(ctnetlink_flush_iterate, &iter);
1614 kfree(filter);
1615
1616 return 0;
1617 }
1618
ctnetlink_del_conntrack(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])1619 static int ctnetlink_del_conntrack(struct sk_buff *skb,
1620 const struct nfnl_info *info,
1621 const struct nlattr * const cda[])
1622 {
1623 u8 family = info->nfmsg->nfgen_family;
1624 struct nf_conntrack_tuple_hash *h;
1625 struct nf_conntrack_tuple tuple;
1626 struct nf_conntrack_zone zone;
1627 struct nf_conn *ct;
1628 int err;
1629
1630 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1631 if (err < 0)
1632 return err;
1633
1634 if (cda[CTA_TUPLE_ORIG] && !cda[CTA_FILTER])
1635 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1636 family, &zone);
1637 else if (cda[CTA_TUPLE_REPLY] && !cda[CTA_FILTER])
1638 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1639 family, &zone);
1640 else {
1641 u8 u3 = info->nfmsg->version || cda[CTA_FILTER] ? family : AF_UNSPEC;
1642
1643 return ctnetlink_flush_conntrack(info->net, cda,
1644 NETLINK_CB(skb).portid,
1645 nlmsg_report(info->nlh), u3);
1646 }
1647
1648 if (err < 0)
1649 return err;
1650
1651 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1652 if (!h)
1653 return -ENOENT;
1654
1655 ct = nf_ct_tuplehash_to_ctrack(h);
1656
1657 if (cda[CTA_ID]) {
1658 __be32 id = nla_get_be32(cda[CTA_ID]);
1659
1660 if (id != (__force __be32)nf_ct_get_id(ct)) {
1661 nf_ct_put(ct);
1662 return -ENOENT;
1663 }
1664 }
1665
1666 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(info->nlh));
1667 nf_ct_put(ct);
1668
1669 return 0;
1670 }
1671
ctnetlink_get_conntrack(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])1672 static int ctnetlink_get_conntrack(struct sk_buff *skb,
1673 const struct nfnl_info *info,
1674 const struct nlattr * const cda[])
1675 {
1676 u_int8_t u3 = info->nfmsg->nfgen_family;
1677 struct nf_conntrack_tuple_hash *h;
1678 struct nf_conntrack_tuple tuple;
1679 struct nf_conntrack_zone zone;
1680 struct sk_buff *skb2;
1681 struct nf_conn *ct;
1682 int err;
1683
1684 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1685 struct netlink_dump_control c = {
1686 .start = ctnetlink_start,
1687 .dump = ctnetlink_dump_table,
1688 .done = ctnetlink_done,
1689 .data = (void *)cda,
1690 };
1691
1692 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1693 }
1694
1695 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1696 if (err < 0)
1697 return err;
1698
1699 if (cda[CTA_TUPLE_ORIG])
1700 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1701 u3, &zone);
1702 else if (cda[CTA_TUPLE_REPLY])
1703 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1704 u3, &zone);
1705 else
1706 return -EINVAL;
1707
1708 if (err < 0)
1709 return err;
1710
1711 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1712 if (!h)
1713 return -ENOENT;
1714
1715 ct = nf_ct_tuplehash_to_ctrack(h);
1716
1717 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1718 if (!skb2) {
1719 nf_ct_put(ct);
1720 return -ENOMEM;
1721 }
1722
1723 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid,
1724 info->nlh->nlmsg_seq,
1725 NFNL_MSG_TYPE(info->nlh->nlmsg_type), ct,
1726 true, 0);
1727 nf_ct_put(ct);
1728 if (err <= 0) {
1729 kfree_skb(skb2);
1730 return -ENOMEM;
1731 }
1732
1733 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
1734 }
1735
ctnetlink_done_list(struct netlink_callback * cb)1736 static int ctnetlink_done_list(struct netlink_callback *cb)
1737 {
1738 struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
1739
1740 if (ctx->last)
1741 nf_ct_put(ctx->last);
1742
1743 return 0;
1744 }
1745
1746 #ifdef CONFIG_NF_CONNTRACK_EVENTS
ctnetlink_dump_one_entry(struct sk_buff * skb,struct netlink_callback * cb,struct nf_conn * ct,bool dying)1747 static int ctnetlink_dump_one_entry(struct sk_buff *skb,
1748 struct netlink_callback *cb,
1749 struct nf_conn *ct,
1750 bool dying)
1751 {
1752 struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
1753 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1754 u8 l3proto = nfmsg->nfgen_family;
1755 int res;
1756
1757 if (l3proto && nf_ct_l3num(ct) != l3proto)
1758 return 0;
1759
1760 if (ctx->last) {
1761 if (ct != ctx->last)
1762 return 0;
1763
1764 ctx->last = NULL;
1765 }
1766
1767 /* We can't dump extension info for the unconfirmed
1768 * list because unconfirmed conntracks can have
1769 * ct->ext reallocated (and thus freed).
1770 *
1771 * In the dying list case ct->ext can't be free'd
1772 * until after we drop pcpu->lock.
1773 */
1774 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1775 cb->nlh->nlmsg_seq,
1776 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1777 ct, dying, 0);
1778 if (res < 0) {
1779 if (!refcount_inc_not_zero(&ct->ct_general.use))
1780 return 0;
1781
1782 ctx->last = ct;
1783 }
1784
1785 return res;
1786 }
1787 #endif
1788
1789 static int
ctnetlink_dump_unconfirmed(struct sk_buff * skb,struct netlink_callback * cb)1790 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1791 {
1792 return 0;
1793 }
1794
1795 static int
ctnetlink_dump_dying(struct sk_buff * skb,struct netlink_callback * cb)1796 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1797 {
1798 struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
1799 struct nf_conn *last = ctx->last;
1800 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1801 const struct net *net = sock_net(skb->sk);
1802 struct nf_conntrack_net_ecache *ecache_net;
1803 struct nf_conntrack_tuple_hash *h;
1804 struct hlist_nulls_node *n;
1805 #endif
1806
1807 if (ctx->done)
1808 return 0;
1809
1810 ctx->last = NULL;
1811
1812 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1813 ecache_net = nf_conn_pernet_ecache(net);
1814 spin_lock_bh(&ecache_net->dying_lock);
1815
1816 hlist_nulls_for_each_entry(h, n, &ecache_net->dying_list, hnnode) {
1817 struct nf_conn *ct;
1818 int res;
1819
1820 ct = nf_ct_tuplehash_to_ctrack(h);
1821 if (last && last != ct)
1822 continue;
1823
1824 res = ctnetlink_dump_one_entry(skb, cb, ct, true);
1825 if (res < 0) {
1826 spin_unlock_bh(&ecache_net->dying_lock);
1827 nf_ct_put(last);
1828 return skb->len;
1829 }
1830
1831 nf_ct_put(last);
1832 last = NULL;
1833 }
1834
1835 spin_unlock_bh(&ecache_net->dying_lock);
1836 #endif
1837 ctx->done = true;
1838 nf_ct_put(last);
1839
1840 return skb->len;
1841 }
1842
ctnetlink_get_ct_dying(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])1843 static int ctnetlink_get_ct_dying(struct sk_buff *skb,
1844 const struct nfnl_info *info,
1845 const struct nlattr * const cda[])
1846 {
1847 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1848 struct netlink_dump_control c = {
1849 .dump = ctnetlink_dump_dying,
1850 .done = ctnetlink_done_list,
1851 };
1852 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1853 }
1854
1855 return -EOPNOTSUPP;
1856 }
1857
ctnetlink_get_ct_unconfirmed(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])1858 static int ctnetlink_get_ct_unconfirmed(struct sk_buff *skb,
1859 const struct nfnl_info *info,
1860 const struct nlattr * const cda[])
1861 {
1862 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1863 struct netlink_dump_control c = {
1864 .dump = ctnetlink_dump_unconfirmed,
1865 .done = ctnetlink_done_list,
1866 };
1867 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1868 }
1869
1870 return -EOPNOTSUPP;
1871 }
1872
1873 #if IS_ENABLED(CONFIG_NF_NAT)
1874 static int
ctnetlink_parse_nat_setup(struct nf_conn * ct,enum nf_nat_manip_type manip,const struct nlattr * attr)1875 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1876 enum nf_nat_manip_type manip,
1877 const struct nlattr *attr)
1878 __must_hold(RCU)
1879 {
1880 const struct nf_nat_hook *nat_hook;
1881 int err;
1882
1883 nat_hook = rcu_dereference(nf_nat_hook);
1884 if (!nat_hook) {
1885 #ifdef CONFIG_MODULES
1886 rcu_read_unlock();
1887 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1888 if (request_module("nf-nat") < 0) {
1889 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1890 rcu_read_lock();
1891 return -EOPNOTSUPP;
1892 }
1893 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1894 rcu_read_lock();
1895 nat_hook = rcu_dereference(nf_nat_hook);
1896 if (nat_hook)
1897 return -EAGAIN;
1898 #endif
1899 return -EOPNOTSUPP;
1900 }
1901
1902 err = nat_hook->parse_nat_setup(ct, manip, attr);
1903 if (err == -EAGAIN) {
1904 #ifdef CONFIG_MODULES
1905 rcu_read_unlock();
1906 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1907 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1908 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1909 rcu_read_lock();
1910 return -EOPNOTSUPP;
1911 }
1912 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1913 rcu_read_lock();
1914 #else
1915 err = -EOPNOTSUPP;
1916 #endif
1917 }
1918 return err;
1919 }
1920 #endif
1921
1922 static int
ctnetlink_change_status(struct nf_conn * ct,const struct nlattr * const cda[])1923 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1924 {
1925 return nf_ct_change_status_common(ct, ntohl(nla_get_be32(cda[CTA_STATUS])));
1926 }
1927
1928 static int
ctnetlink_setup_nat(struct nf_conn * ct,const struct nlattr * const cda[])1929 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1930 {
1931 #if IS_ENABLED(CONFIG_NF_NAT)
1932 int ret;
1933
1934 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1935 return 0;
1936
1937 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1938 cda[CTA_NAT_DST]);
1939 if (ret < 0)
1940 return ret;
1941
1942 return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1943 cda[CTA_NAT_SRC]);
1944 #else
1945 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1946 return 0;
1947 return -EOPNOTSUPP;
1948 #endif
1949 }
1950
ctnetlink_change_helper(struct nf_conn * ct,const struct nlattr * const cda[])1951 static int ctnetlink_change_helper(struct nf_conn *ct,
1952 const struct nlattr * const cda[])
1953 {
1954 struct nf_conntrack_helper *helper;
1955 struct nf_conn_help *help = nfct_help(ct);
1956 char *helpname = NULL;
1957 struct nlattr *helpinfo = NULL;
1958 int err;
1959
1960 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1961 if (err < 0)
1962 return err;
1963
1964 /* don't change helper of sibling connections */
1965 if (ct->master) {
1966 /* If we try to change the helper to the same thing twice,
1967 * treat the second attempt as a no-op instead of returning
1968 * an error.
1969 */
1970 err = -EBUSY;
1971 if (help) {
1972 rcu_read_lock();
1973 helper = rcu_dereference(help->helper);
1974 if (helper && !strcmp(helper->name, helpname))
1975 err = 0;
1976 rcu_read_unlock();
1977 }
1978
1979 return err;
1980 }
1981
1982 if (!strcmp(helpname, "")) {
1983 if (help && help->helper) {
1984 /* we had a helper before ... */
1985 nf_ct_remove_expectations(ct);
1986 RCU_INIT_POINTER(help->helper, NULL);
1987 }
1988
1989 return 0;
1990 }
1991
1992 rcu_read_lock();
1993 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1994 nf_ct_protonum(ct));
1995 if (helper == NULL) {
1996 rcu_read_unlock();
1997 return -EOPNOTSUPP;
1998 }
1999
2000 if (help) {
2001 if (rcu_access_pointer(help->helper) == helper) {
2002 /* update private helper data if allowed. */
2003 if (helper->from_nlattr)
2004 helper->from_nlattr(helpinfo, ct);
2005 err = 0;
2006 } else
2007 err = -EBUSY;
2008 } else {
2009 /* we cannot set a helper for an existing conntrack */
2010 err = -EOPNOTSUPP;
2011 }
2012
2013 rcu_read_unlock();
2014 return err;
2015 }
2016
ctnetlink_change_timeout(struct nf_conn * ct,const struct nlattr * const cda[])2017 static int ctnetlink_change_timeout(struct nf_conn *ct,
2018 const struct nlattr * const cda[])
2019 {
2020 return __nf_ct_change_timeout(ct, (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ);
2021 }
2022
2023 #if defined(CONFIG_NF_CONNTRACK_MARK)
ctnetlink_change_mark(struct nf_conn * ct,const struct nlattr * const cda[])2024 static void ctnetlink_change_mark(struct nf_conn *ct,
2025 const struct nlattr * const cda[])
2026 {
2027 u32 mark, newmark, mask = 0;
2028
2029 if (cda[CTA_MARK_MASK])
2030 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2031
2032 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2033 newmark = (READ_ONCE(ct->mark) & mask) ^ mark;
2034 if (newmark != READ_ONCE(ct->mark))
2035 WRITE_ONCE(ct->mark, newmark);
2036 }
2037 #endif
2038
2039 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
2040 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
2041 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
2042 };
2043
ctnetlink_change_protoinfo(struct nf_conn * ct,const struct nlattr * const cda[])2044 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
2045 const struct nlattr * const cda[])
2046 {
2047 const struct nlattr *attr = cda[CTA_PROTOINFO];
2048 const struct nf_conntrack_l4proto *l4proto;
2049 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
2050 int err = 0;
2051
2052 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
2053 protoinfo_policy, NULL);
2054 if (err < 0)
2055 return err;
2056
2057 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
2058 if (l4proto->from_nlattr)
2059 err = l4proto->from_nlattr(tb, ct);
2060
2061 return err;
2062 }
2063
2064 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
2065 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
2066 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
2067 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
2068 };
2069
change_seq_adj(struct nf_ct_seqadj * seq,const struct nlattr * const attr)2070 static int change_seq_adj(struct nf_ct_seqadj *seq,
2071 const struct nlattr * const attr)
2072 {
2073 int err;
2074 struct nlattr *cda[CTA_SEQADJ_MAX+1];
2075
2076 err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
2077 seqadj_policy, NULL);
2078 if (err < 0)
2079 return err;
2080
2081 if (!cda[CTA_SEQADJ_CORRECTION_POS])
2082 return -EINVAL;
2083
2084 seq->correction_pos =
2085 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
2086
2087 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
2088 return -EINVAL;
2089
2090 seq->offset_before =
2091 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
2092
2093 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
2094 return -EINVAL;
2095
2096 seq->offset_after =
2097 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
2098
2099 return 0;
2100 }
2101
2102 static int
ctnetlink_change_seq_adj(struct nf_conn * ct,const struct nlattr * const cda[])2103 ctnetlink_change_seq_adj(struct nf_conn *ct,
2104 const struct nlattr * const cda[])
2105 {
2106 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
2107 int ret = 0;
2108
2109 if (!seqadj)
2110 return 0;
2111
2112 spin_lock_bh(&ct->lock);
2113 if (cda[CTA_SEQ_ADJ_ORIG]) {
2114 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
2115 cda[CTA_SEQ_ADJ_ORIG]);
2116 if (ret < 0)
2117 goto err;
2118
2119 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2120 }
2121
2122 if (cda[CTA_SEQ_ADJ_REPLY]) {
2123 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
2124 cda[CTA_SEQ_ADJ_REPLY]);
2125 if (ret < 0)
2126 goto err;
2127
2128 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2129 }
2130
2131 spin_unlock_bh(&ct->lock);
2132 return 0;
2133 err:
2134 spin_unlock_bh(&ct->lock);
2135 return ret;
2136 }
2137
2138 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
2139 [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
2140 [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
2141 [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
2142 };
2143
ctnetlink_change_synproxy(struct nf_conn * ct,const struct nlattr * const cda[])2144 static int ctnetlink_change_synproxy(struct nf_conn *ct,
2145 const struct nlattr * const cda[])
2146 {
2147 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
2148 struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
2149 int err;
2150
2151 if (!synproxy)
2152 return 0;
2153
2154 err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
2155 cda[CTA_SYNPROXY], synproxy_policy,
2156 NULL);
2157 if (err < 0)
2158 return err;
2159
2160 if (!tb[CTA_SYNPROXY_ISN] ||
2161 !tb[CTA_SYNPROXY_ITS] ||
2162 !tb[CTA_SYNPROXY_TSOFF])
2163 return -EINVAL;
2164
2165 synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
2166 synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
2167 synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
2168
2169 return 0;
2170 }
2171
2172 static int
ctnetlink_attach_labels(struct nf_conn * ct,const struct nlattr * const cda[])2173 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
2174 {
2175 #ifdef CONFIG_NF_CONNTRACK_LABELS
2176 size_t len = nla_len(cda[CTA_LABELS]);
2177 const void *mask = cda[CTA_LABELS_MASK];
2178
2179 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
2180 return -EINVAL;
2181
2182 if (mask) {
2183 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
2184 nla_len(cda[CTA_LABELS_MASK]) != len)
2185 return -EINVAL;
2186 mask = nla_data(cda[CTA_LABELS_MASK]);
2187 }
2188
2189 len /= sizeof(u32);
2190
2191 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
2192 #else
2193 return -EOPNOTSUPP;
2194 #endif
2195 }
2196
2197 static int
ctnetlink_change_conntrack(struct nf_conn * ct,const struct nlattr * const cda[])2198 ctnetlink_change_conntrack(struct nf_conn *ct,
2199 const struct nlattr * const cda[])
2200 {
2201 int err;
2202
2203 /* only allow NAT changes and master assignation for new conntracks */
2204 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
2205 return -EOPNOTSUPP;
2206
2207 if (cda[CTA_HELP]) {
2208 err = ctnetlink_change_helper(ct, cda);
2209 if (err < 0)
2210 return err;
2211 }
2212
2213 if (cda[CTA_TIMEOUT]) {
2214 err = ctnetlink_change_timeout(ct, cda);
2215 if (err < 0)
2216 return err;
2217 }
2218
2219 if (cda[CTA_STATUS]) {
2220 err = ctnetlink_change_status(ct, cda);
2221 if (err < 0)
2222 return err;
2223 }
2224
2225 if (cda[CTA_PROTOINFO]) {
2226 err = ctnetlink_change_protoinfo(ct, cda);
2227 if (err < 0)
2228 return err;
2229 }
2230
2231 #if defined(CONFIG_NF_CONNTRACK_MARK)
2232 if (cda[CTA_MARK])
2233 ctnetlink_change_mark(ct, cda);
2234 #endif
2235
2236 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2237 err = ctnetlink_change_seq_adj(ct, cda);
2238 if (err < 0)
2239 return err;
2240 }
2241
2242 if (cda[CTA_SYNPROXY]) {
2243 err = ctnetlink_change_synproxy(ct, cda);
2244 if (err < 0)
2245 return err;
2246 }
2247
2248 if (cda[CTA_LABELS]) {
2249 err = ctnetlink_attach_labels(ct, cda);
2250 if (err < 0)
2251 return err;
2252 }
2253
2254 return 0;
2255 }
2256
2257 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)2258 ctnetlink_create_conntrack(struct net *net,
2259 const struct nf_conntrack_zone *zone,
2260 const struct nlattr * const cda[],
2261 struct nf_conntrack_tuple *otuple,
2262 struct nf_conntrack_tuple *rtuple,
2263 u8 u3)
2264 {
2265 struct nf_conn *ct;
2266 int err = -EINVAL;
2267 struct nf_conntrack_helper *helper;
2268 struct nf_conn_tstamp *tstamp;
2269 u64 timeout;
2270
2271 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
2272 if (IS_ERR(ct))
2273 return ERR_PTR(-ENOMEM);
2274
2275 if (!cda[CTA_TIMEOUT])
2276 goto err1;
2277
2278 rcu_read_lock();
2279 if (cda[CTA_HELP]) {
2280 char *helpname = NULL;
2281 struct nlattr *helpinfo = NULL;
2282
2283 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
2284 if (err < 0)
2285 goto err2;
2286
2287 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2288 nf_ct_protonum(ct));
2289 if (helper == NULL) {
2290 rcu_read_unlock();
2291 #ifdef CONFIG_MODULES
2292 if (request_module("nfct-helper-%s", helpname) < 0) {
2293 err = -EOPNOTSUPP;
2294 goto err1;
2295 }
2296
2297 rcu_read_lock();
2298 helper = __nf_conntrack_helper_find(helpname,
2299 nf_ct_l3num(ct),
2300 nf_ct_protonum(ct));
2301 if (helper) {
2302 err = -EAGAIN;
2303 goto err2;
2304 }
2305 rcu_read_unlock();
2306 #endif
2307 err = -EOPNOTSUPP;
2308 goto err1;
2309 } else {
2310 struct nf_conn_help *help;
2311
2312 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2313 if (help == NULL) {
2314 err = -ENOMEM;
2315 goto err2;
2316 }
2317 /* set private helper data if allowed. */
2318 if (helper->from_nlattr)
2319 helper->from_nlattr(helpinfo, ct);
2320
2321 /* disable helper auto-assignment for this entry */
2322 ct->status |= IPS_HELPER;
2323 RCU_INIT_POINTER(help->helper, helper);
2324 }
2325 }
2326
2327 err = ctnetlink_setup_nat(ct, cda);
2328 if (err < 0)
2329 goto err2;
2330
2331 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2332 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2333 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2334 nf_ct_labels_ext_add(ct);
2335 nfct_seqadj_ext_add(ct);
2336 nfct_synproxy_ext_add(ct);
2337
2338 /* we must add conntrack extensions before confirmation. */
2339 ct->status |= IPS_CONFIRMED;
2340
2341 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2342 __nf_ct_set_timeout(ct, timeout);
2343
2344 if (cda[CTA_STATUS]) {
2345 err = ctnetlink_change_status(ct, cda);
2346 if (err < 0)
2347 goto err2;
2348 }
2349
2350 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2351 err = ctnetlink_change_seq_adj(ct, cda);
2352 if (err < 0)
2353 goto err2;
2354 }
2355
2356 memset(&ct->proto, 0, sizeof(ct->proto));
2357 if (cda[CTA_PROTOINFO]) {
2358 err = ctnetlink_change_protoinfo(ct, cda);
2359 if (err < 0)
2360 goto err2;
2361 }
2362
2363 if (cda[CTA_SYNPROXY]) {
2364 err = ctnetlink_change_synproxy(ct, cda);
2365 if (err < 0)
2366 goto err2;
2367 }
2368
2369 #if defined(CONFIG_NF_CONNTRACK_MARK)
2370 if (cda[CTA_MARK])
2371 ctnetlink_change_mark(ct, cda);
2372 #endif
2373
2374 /* setup master conntrack: this is a confirmed expectation */
2375 if (cda[CTA_TUPLE_MASTER]) {
2376 struct nf_conntrack_tuple master;
2377 struct nf_conntrack_tuple_hash *master_h;
2378 struct nf_conn *master_ct;
2379
2380 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2381 u3, NULL);
2382 if (err < 0)
2383 goto err2;
2384
2385 master_h = nf_conntrack_find_get(net, zone, &master);
2386 if (master_h == NULL) {
2387 err = -ENOENT;
2388 goto err2;
2389 }
2390 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2391 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2392 ct->master = master_ct;
2393 }
2394 tstamp = nf_conn_tstamp_find(ct);
2395 if (tstamp)
2396 tstamp->start = ktime_get_real_ns();
2397
2398 err = nf_conntrack_hash_check_insert(ct);
2399 if (err < 0)
2400 goto err3;
2401
2402 rcu_read_unlock();
2403
2404 return ct;
2405
2406 err3:
2407 if (ct->master)
2408 nf_ct_put(ct->master);
2409 err2:
2410 rcu_read_unlock();
2411 err1:
2412 nf_conntrack_free(ct);
2413 return ERR_PTR(err);
2414 }
2415
ctnetlink_new_conntrack(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])2416 static int ctnetlink_new_conntrack(struct sk_buff *skb,
2417 const struct nfnl_info *info,
2418 const struct nlattr * const cda[])
2419 {
2420 struct nf_conntrack_tuple otuple, rtuple;
2421 struct nf_conntrack_tuple_hash *h = NULL;
2422 u_int8_t u3 = info->nfmsg->nfgen_family;
2423 struct nf_conntrack_zone zone;
2424 struct nf_conn *ct;
2425 int err;
2426
2427 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2428 if (err < 0)
2429 return err;
2430
2431 if (cda[CTA_TUPLE_ORIG]) {
2432 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2433 u3, &zone);
2434 if (err < 0)
2435 return err;
2436 }
2437
2438 if (cda[CTA_TUPLE_REPLY]) {
2439 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2440 u3, &zone);
2441 if (err < 0)
2442 return err;
2443 }
2444
2445 if (cda[CTA_TUPLE_ORIG])
2446 h = nf_conntrack_find_get(info->net, &zone, &otuple);
2447 else if (cda[CTA_TUPLE_REPLY])
2448 h = nf_conntrack_find_get(info->net, &zone, &rtuple);
2449
2450 if (h == NULL) {
2451 err = -ENOENT;
2452 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
2453 enum ip_conntrack_events events;
2454
2455 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2456 return -EINVAL;
2457 if (otuple.dst.protonum != rtuple.dst.protonum)
2458 return -EINVAL;
2459
2460 ct = ctnetlink_create_conntrack(info->net, &zone, cda,
2461 &otuple, &rtuple, u3);
2462 if (IS_ERR(ct))
2463 return PTR_ERR(ct);
2464
2465 err = 0;
2466 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2467 events = 1 << IPCT_RELATED;
2468 else
2469 events = 1 << IPCT_NEW;
2470
2471 if (cda[CTA_LABELS] &&
2472 ctnetlink_attach_labels(ct, cda) == 0)
2473 events |= (1 << IPCT_LABEL);
2474
2475 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2476 (1 << IPCT_ASSURED) |
2477 (1 << IPCT_HELPER) |
2478 (1 << IPCT_PROTOINFO) |
2479 (1 << IPCT_SEQADJ) |
2480 (1 << IPCT_MARK) |
2481 (1 << IPCT_SYNPROXY) |
2482 events,
2483 ct, NETLINK_CB(skb).portid,
2484 nlmsg_report(info->nlh));
2485 nf_ct_put(ct);
2486 }
2487
2488 return err;
2489 }
2490 /* implicit 'else' */
2491
2492 err = -EEXIST;
2493 ct = nf_ct_tuplehash_to_ctrack(h);
2494 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL)) {
2495 err = ctnetlink_change_conntrack(ct, cda);
2496 if (err == 0) {
2497 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2498 (1 << IPCT_ASSURED) |
2499 (1 << IPCT_HELPER) |
2500 (1 << IPCT_LABEL) |
2501 (1 << IPCT_PROTOINFO) |
2502 (1 << IPCT_SEQADJ) |
2503 (1 << IPCT_MARK) |
2504 (1 << IPCT_SYNPROXY),
2505 ct, NETLINK_CB(skb).portid,
2506 nlmsg_report(info->nlh));
2507 }
2508 }
2509
2510 nf_ct_put(ct);
2511 return err;
2512 }
2513
2514 static int
ctnetlink_ct_stat_cpu_fill_info(struct sk_buff * skb,u32 portid,u32 seq,__u16 cpu,const struct ip_conntrack_stat * st)2515 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2516 __u16 cpu, const struct ip_conntrack_stat *st)
2517 {
2518 struct nlmsghdr *nlh;
2519 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2520
2521 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2522 IPCTNL_MSG_CT_GET_STATS_CPU);
2523 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2524 NFNETLINK_V0, htons(cpu));
2525 if (!nlh)
2526 goto nlmsg_failure;
2527
2528 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2529 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2530 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2531 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2532 htonl(st->insert_failed)) ||
2533 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2534 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2535 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2536 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2537 htonl(st->search_restart)) ||
2538 nla_put_be32(skb, CTA_STATS_CLASH_RESOLVE,
2539 htonl(st->clash_resolve)) ||
2540 nla_put_be32(skb, CTA_STATS_CHAIN_TOOLONG,
2541 htonl(st->chaintoolong)))
2542 goto nla_put_failure;
2543
2544 nlmsg_end(skb, nlh);
2545 return skb->len;
2546
2547 nla_put_failure:
2548 nlmsg_failure:
2549 nlmsg_cancel(skb, nlh);
2550 return -1;
2551 }
2552
2553 static int
ctnetlink_ct_stat_cpu_dump(struct sk_buff * skb,struct netlink_callback * cb)2554 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2555 {
2556 int cpu;
2557 struct net *net = sock_net(skb->sk);
2558
2559 if (cb->args[0] == nr_cpu_ids)
2560 return 0;
2561
2562 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2563 const struct ip_conntrack_stat *st;
2564
2565 if (!cpu_possible(cpu))
2566 continue;
2567
2568 st = per_cpu_ptr(net->ct.stat, cpu);
2569 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2570 NETLINK_CB(cb->skb).portid,
2571 cb->nlh->nlmsg_seq,
2572 cpu, st) < 0)
2573 break;
2574 }
2575 cb->args[0] = cpu;
2576
2577 return skb->len;
2578 }
2579
ctnetlink_stat_ct_cpu(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])2580 static int ctnetlink_stat_ct_cpu(struct sk_buff *skb,
2581 const struct nfnl_info *info,
2582 const struct nlattr * const cda[])
2583 {
2584 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
2585 struct netlink_dump_control c = {
2586 .dump = ctnetlink_ct_stat_cpu_dump,
2587 };
2588 return netlink_dump_start(info->sk, skb, info->nlh, &c);
2589 }
2590
2591 return 0;
2592 }
2593
2594 static int
ctnetlink_stat_ct_fill_info(struct sk_buff * skb,u32 portid,u32 seq,u32 type,struct net * net)2595 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2596 struct net *net)
2597 {
2598 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2599 unsigned int nr_conntracks;
2600 struct nlmsghdr *nlh;
2601
2602 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2603 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2604 NFNETLINK_V0, 0);
2605 if (!nlh)
2606 goto nlmsg_failure;
2607
2608 nr_conntracks = nf_conntrack_count(net);
2609 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2610 goto nla_put_failure;
2611
2612 if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2613 goto nla_put_failure;
2614
2615 nlmsg_end(skb, nlh);
2616 return skb->len;
2617
2618 nla_put_failure:
2619 nlmsg_failure:
2620 nlmsg_cancel(skb, nlh);
2621 return -1;
2622 }
2623
ctnetlink_stat_ct(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])2624 static int ctnetlink_stat_ct(struct sk_buff *skb, const struct nfnl_info *info,
2625 const struct nlattr * const cda[])
2626 {
2627 struct sk_buff *skb2;
2628 int err;
2629
2630 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2631 if (skb2 == NULL)
2632 return -ENOMEM;
2633
2634 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2635 info->nlh->nlmsg_seq,
2636 NFNL_MSG_TYPE(info->nlh->nlmsg_type),
2637 sock_net(skb->sk));
2638 if (err <= 0) {
2639 kfree_skb(skb2);
2640 return -ENOMEM;
2641 }
2642
2643 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
2644 }
2645
2646 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2647 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2648 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2649 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2650 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2651 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2652 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2653 .len = NF_CT_HELPER_NAME_LEN - 1 },
2654 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2655 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2656 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2657 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2658 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2659 };
2660
2661 static struct nf_conntrack_expect *
2662 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2663 struct nf_conntrack_helper *helper,
2664 struct nf_conntrack_tuple *tuple,
2665 struct nf_conntrack_tuple *mask);
2666
2667 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2668 static size_t
ctnetlink_glue_build_size(const struct nf_conn * ct)2669 ctnetlink_glue_build_size(const struct nf_conn *ct)
2670 {
2671 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2672 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2673 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2674 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2675 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2676 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2677 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2678 + nla_total_size(0) /* CTA_PROTOINFO */
2679 + nla_total_size(0) /* CTA_HELP */
2680 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2681 + ctnetlink_secctx_size(ct)
2682 + ctnetlink_acct_size(ct)
2683 + ctnetlink_timestamp_size(ct)
2684 #if IS_ENABLED(CONFIG_NF_NAT)
2685 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2686 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2687 #endif
2688 #ifdef CONFIG_NF_CONNTRACK_MARK
2689 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2690 #endif
2691 #ifdef CONFIG_NF_CONNTRACK_ZONES
2692 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2693 #endif
2694 + ctnetlink_proto_size(ct)
2695 ;
2696 }
2697
__ctnetlink_glue_build(struct sk_buff * skb,struct nf_conn * ct)2698 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2699 {
2700 const struct nf_conntrack_zone *zone;
2701 struct nlattr *nest_parms;
2702
2703 zone = nf_ct_zone(ct);
2704
2705 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2706 if (!nest_parms)
2707 goto nla_put_failure;
2708 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2709 goto nla_put_failure;
2710 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2711 NF_CT_ZONE_DIR_ORIG) < 0)
2712 goto nla_put_failure;
2713 nla_nest_end(skb, nest_parms);
2714
2715 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2716 if (!nest_parms)
2717 goto nla_put_failure;
2718 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2719 goto nla_put_failure;
2720 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2721 NF_CT_ZONE_DIR_REPL) < 0)
2722 goto nla_put_failure;
2723 nla_nest_end(skb, nest_parms);
2724
2725 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2726 NF_CT_DEFAULT_ZONE_DIR) < 0)
2727 goto nla_put_failure;
2728
2729 if (ctnetlink_dump_id(skb, ct) < 0)
2730 goto nla_put_failure;
2731
2732 if (ctnetlink_dump_status(skb, ct) < 0)
2733 goto nla_put_failure;
2734
2735 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
2736 goto nla_put_failure;
2737
2738 if (ctnetlink_dump_protoinfo(skb, ct, false) < 0)
2739 goto nla_put_failure;
2740
2741 if (ctnetlink_dump_acct(skb, ct, IPCTNL_MSG_CT_GET) < 0 ||
2742 ctnetlink_dump_timestamp(skb, ct) < 0)
2743 goto nla_put_failure;
2744
2745 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2746 goto nla_put_failure;
2747
2748 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2749 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2750 goto nla_put_failure;
2751 #endif
2752 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2753 goto nla_put_failure;
2754
2755 if ((ct->status & IPS_SEQ_ADJUST) &&
2756 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2757 goto nla_put_failure;
2758
2759 if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2760 goto nla_put_failure;
2761
2762 #ifdef CONFIG_NF_CONNTRACK_MARK
2763 if (ctnetlink_dump_mark(skb, ct, true) < 0)
2764 goto nla_put_failure;
2765 #endif
2766 if (ctnetlink_dump_labels(skb, ct) < 0)
2767 goto nla_put_failure;
2768 return 0;
2769
2770 nla_put_failure:
2771 return -ENOSPC;
2772 }
2773
2774 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)2775 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2776 enum ip_conntrack_info ctinfo,
2777 u_int16_t ct_attr, u_int16_t ct_info_attr)
2778 {
2779 struct nlattr *nest_parms;
2780
2781 nest_parms = nla_nest_start(skb, ct_attr);
2782 if (!nest_parms)
2783 goto nla_put_failure;
2784
2785 if (__ctnetlink_glue_build(skb, ct) < 0)
2786 goto nla_put_failure;
2787
2788 nla_nest_end(skb, nest_parms);
2789
2790 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2791 goto nla_put_failure;
2792
2793 return 0;
2794
2795 nla_put_failure:
2796 return -ENOSPC;
2797 }
2798
2799 static int
ctnetlink_update_status(struct nf_conn * ct,const struct nlattr * const cda[])2800 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2801 {
2802 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2803 unsigned long d = ct->status ^ status;
2804
2805 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2806 /* SEEN_REPLY bit can only be set */
2807 return -EBUSY;
2808
2809 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2810 /* ASSURED bit can only be set */
2811 return -EBUSY;
2812
2813 /* This check is less strict than ctnetlink_change_status()
2814 * because callers often flip IPS_EXPECTED bits when sending
2815 * an NFQA_CT attribute to the kernel. So ignore the
2816 * unchangeable bits but do not error out. Also user programs
2817 * are allowed to clear the bits that they are allowed to change.
2818 */
2819 __nf_ct_change_status(ct, status, ~status);
2820 return 0;
2821 }
2822
2823 static int
ctnetlink_glue_parse_ct(const struct nlattr * cda[],struct nf_conn * ct)2824 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2825 {
2826 int err;
2827
2828 if (cda[CTA_TIMEOUT]) {
2829 err = ctnetlink_change_timeout(ct, cda);
2830 if (err < 0)
2831 return err;
2832 }
2833 if (cda[CTA_STATUS]) {
2834 err = ctnetlink_update_status(ct, cda);
2835 if (err < 0)
2836 return err;
2837 }
2838 if (cda[CTA_HELP]) {
2839 err = ctnetlink_change_helper(ct, cda);
2840 if (err < 0)
2841 return err;
2842 }
2843 if (cda[CTA_LABELS]) {
2844 err = ctnetlink_attach_labels(ct, cda);
2845 if (err < 0)
2846 return err;
2847 }
2848 #if defined(CONFIG_NF_CONNTRACK_MARK)
2849 if (cda[CTA_MARK]) {
2850 ctnetlink_change_mark(ct, cda);
2851 }
2852 #endif
2853 return 0;
2854 }
2855
2856 static int
ctnetlink_glue_parse(const struct nlattr * attr,struct nf_conn * ct)2857 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2858 {
2859 struct nlattr *cda[CTA_MAX+1];
2860 int ret;
2861
2862 ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2863 NULL);
2864 if (ret < 0)
2865 return ret;
2866
2867 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2868 }
2869
ctnetlink_glue_exp_parse(const struct nlattr * const * cda,const struct nf_conn * ct,struct nf_conntrack_tuple * tuple,struct nf_conntrack_tuple * mask)2870 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2871 const struct nf_conn *ct,
2872 struct nf_conntrack_tuple *tuple,
2873 struct nf_conntrack_tuple *mask)
2874 {
2875 int err;
2876
2877 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2878 nf_ct_l3num(ct), NULL);
2879 if (err < 0)
2880 return err;
2881
2882 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2883 nf_ct_l3num(ct), NULL);
2884 }
2885
2886 static int
ctnetlink_glue_attach_expect(const struct nlattr * attr,struct nf_conn * ct,u32 portid,u32 report)2887 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2888 u32 portid, u32 report)
2889 {
2890 struct nlattr *cda[CTA_EXPECT_MAX+1];
2891 struct nf_conntrack_tuple tuple, mask;
2892 struct nf_conntrack_helper *helper = NULL;
2893 struct nf_conntrack_expect *exp;
2894 int err;
2895
2896 err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2897 exp_nla_policy, NULL);
2898 if (err < 0)
2899 return err;
2900
2901 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2902 ct, &tuple, &mask);
2903 if (err < 0)
2904 return err;
2905
2906 if (cda[CTA_EXPECT_HELP_NAME]) {
2907 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2908
2909 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2910 nf_ct_protonum(ct));
2911 if (helper == NULL)
2912 return -EOPNOTSUPP;
2913 }
2914
2915 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2916 helper, &tuple, &mask);
2917 if (IS_ERR(exp))
2918 return PTR_ERR(exp);
2919
2920 err = nf_ct_expect_related_report(exp, portid, report, 0);
2921 nf_ct_expect_put(exp);
2922 return err;
2923 }
2924
ctnetlink_glue_seqadj(struct sk_buff * skb,struct nf_conn * ct,enum ip_conntrack_info ctinfo,int diff)2925 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2926 enum ip_conntrack_info ctinfo, int diff)
2927 {
2928 if (!(ct->status & IPS_NAT_MASK))
2929 return;
2930
2931 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2932 }
2933
2934 static const struct nfnl_ct_hook ctnetlink_glue_hook = {
2935 .build_size = ctnetlink_glue_build_size,
2936 .build = ctnetlink_glue_build,
2937 .parse = ctnetlink_glue_parse,
2938 .attach_expect = ctnetlink_glue_attach_expect,
2939 .seq_adjust = ctnetlink_glue_seqadj,
2940 };
2941 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2942
2943 /***********************************************************************
2944 * EXPECT
2945 ***********************************************************************/
2946
ctnetlink_exp_dump_tuple(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple,u32 type)2947 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2948 const struct nf_conntrack_tuple *tuple,
2949 u32 type)
2950 {
2951 struct nlattr *nest_parms;
2952
2953 nest_parms = nla_nest_start(skb, type);
2954 if (!nest_parms)
2955 goto nla_put_failure;
2956 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2957 goto nla_put_failure;
2958 nla_nest_end(skb, nest_parms);
2959
2960 return 0;
2961
2962 nla_put_failure:
2963 return -1;
2964 }
2965
ctnetlink_exp_dump_mask(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple,const struct nf_conntrack_tuple_mask * mask)2966 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2967 const struct nf_conntrack_tuple *tuple,
2968 const struct nf_conntrack_tuple_mask *mask)
2969 {
2970 const struct nf_conntrack_l4proto *l4proto;
2971 struct nf_conntrack_tuple m;
2972 struct nlattr *nest_parms;
2973 int ret;
2974
2975 memset(&m, 0xFF, sizeof(m));
2976 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2977 m.src.u.all = mask->src.u.all;
2978 m.src.l3num = tuple->src.l3num;
2979 m.dst.protonum = tuple->dst.protonum;
2980
2981 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2982 if (!nest_parms)
2983 goto nla_put_failure;
2984
2985 rcu_read_lock();
2986 ret = ctnetlink_dump_tuples_ip(skb, &m);
2987 if (ret >= 0) {
2988 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2989 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2990 }
2991 rcu_read_unlock();
2992
2993 if (unlikely(ret < 0))
2994 goto nla_put_failure;
2995
2996 nla_nest_end(skb, nest_parms);
2997
2998 return 0;
2999
3000 nla_put_failure:
3001 return -1;
3002 }
3003
3004 #if IS_ENABLED(CONFIG_NF_NAT)
3005 static const union nf_inet_addr any_addr;
3006 #endif
3007
nf_expect_get_id(const struct nf_conntrack_expect * exp)3008 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
3009 {
3010 static siphash_aligned_key_t exp_id_seed;
3011 unsigned long a, b, c, d;
3012
3013 net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
3014
3015 a = (unsigned long)exp;
3016 b = (unsigned long)exp->helper;
3017 c = (unsigned long)exp->master;
3018 d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
3019
3020 #ifdef CONFIG_64BIT
3021 return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
3022 #else
3023 return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
3024 #endif
3025 }
3026
3027 static int
ctnetlink_exp_dump_expect(struct sk_buff * skb,const struct nf_conntrack_expect * exp)3028 ctnetlink_exp_dump_expect(struct sk_buff *skb,
3029 const struct nf_conntrack_expect *exp)
3030 {
3031 struct nf_conn *master = exp->master;
3032 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
3033 struct nf_conn_help *help;
3034 #if IS_ENABLED(CONFIG_NF_NAT)
3035 struct nlattr *nest_parms;
3036 struct nf_conntrack_tuple nat_tuple = {};
3037 #endif
3038 struct nf_ct_helper_expectfn *expfn;
3039
3040 if (timeout < 0)
3041 timeout = 0;
3042
3043 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
3044 goto nla_put_failure;
3045 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
3046 goto nla_put_failure;
3047 if (ctnetlink_exp_dump_tuple(skb,
3048 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
3049 CTA_EXPECT_MASTER) < 0)
3050 goto nla_put_failure;
3051
3052 #if IS_ENABLED(CONFIG_NF_NAT)
3053 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
3054 exp->saved_proto.all) {
3055 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
3056 if (!nest_parms)
3057 goto nla_put_failure;
3058
3059 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
3060 goto nla_put_failure;
3061
3062 nat_tuple.src.l3num = nf_ct_l3num(master);
3063 nat_tuple.src.u3 = exp->saved_addr;
3064 nat_tuple.dst.protonum = nf_ct_protonum(master);
3065 nat_tuple.src.u = exp->saved_proto;
3066
3067 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
3068 CTA_EXPECT_NAT_TUPLE) < 0)
3069 goto nla_put_failure;
3070 nla_nest_end(skb, nest_parms);
3071 }
3072 #endif
3073 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
3074 nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
3075 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
3076 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
3077 goto nla_put_failure;
3078 help = nfct_help(master);
3079 if (help) {
3080 struct nf_conntrack_helper *helper;
3081
3082 helper = rcu_dereference(help->helper);
3083 if (helper &&
3084 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
3085 goto nla_put_failure;
3086 }
3087 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
3088 if (expfn != NULL &&
3089 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
3090 goto nla_put_failure;
3091
3092 return 0;
3093
3094 nla_put_failure:
3095 return -1;
3096 }
3097
3098 static int
ctnetlink_exp_fill_info(struct sk_buff * skb,u32 portid,u32 seq,int event,const struct nf_conntrack_expect * exp)3099 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
3100 int event, const struct nf_conntrack_expect *exp)
3101 {
3102 struct nlmsghdr *nlh;
3103 unsigned int flags = portid ? NLM_F_MULTI : 0;
3104
3105 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
3106 nlh = nfnl_msg_put(skb, portid, seq, event, flags,
3107 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3108 if (!nlh)
3109 goto nlmsg_failure;
3110
3111 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3112 goto nla_put_failure;
3113
3114 nlmsg_end(skb, nlh);
3115 return skb->len;
3116
3117 nlmsg_failure:
3118 nla_put_failure:
3119 nlmsg_cancel(skb, nlh);
3120 return -1;
3121 }
3122
3123 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3124 static int
ctnetlink_expect_event(unsigned int events,const struct nf_exp_event * item)3125 ctnetlink_expect_event(unsigned int events, const struct nf_exp_event *item)
3126 {
3127 struct nf_conntrack_expect *exp = item->exp;
3128 struct net *net = nf_ct_exp_net(exp);
3129 struct nlmsghdr *nlh;
3130 struct sk_buff *skb;
3131 unsigned int type, group;
3132 int flags = 0;
3133
3134 if (events & (1 << IPEXP_DESTROY)) {
3135 type = IPCTNL_MSG_EXP_DELETE;
3136 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
3137 } else if (events & (1 << IPEXP_NEW)) {
3138 type = IPCTNL_MSG_EXP_NEW;
3139 flags = NLM_F_CREATE|NLM_F_EXCL;
3140 group = NFNLGRP_CONNTRACK_EXP_NEW;
3141 } else
3142 return 0;
3143
3144 if (!item->report && !nfnetlink_has_listeners(net, group))
3145 return 0;
3146
3147 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
3148 if (skb == NULL)
3149 goto errout;
3150
3151 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
3152 nlh = nfnl_msg_put(skb, item->portid, 0, type, flags,
3153 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3154 if (!nlh)
3155 goto nlmsg_failure;
3156
3157 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3158 goto nla_put_failure;
3159
3160 nlmsg_end(skb, nlh);
3161 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
3162 return 0;
3163
3164 nla_put_failure:
3165 nlmsg_cancel(skb, nlh);
3166 nlmsg_failure:
3167 kfree_skb(skb);
3168 errout:
3169 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
3170 return 0;
3171 }
3172 #endif
3173
ctnetlink_exp_id(const struct nf_conntrack_expect * exp)3174 static unsigned long ctnetlink_exp_id(const struct nf_conntrack_expect *exp)
3175 {
3176 unsigned long id = (unsigned long)exp;
3177
3178 id += nf_ct_get_id(exp->master);
3179 id += exp->class;
3180
3181 return id ? id : 1;
3182 }
3183
3184 static int
ctnetlink_exp_dump_table(struct sk_buff * skb,struct netlink_callback * cb)3185 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3186 {
3187 struct net *net = sock_net(skb->sk);
3188 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3189 u_int8_t l3proto = nfmsg->nfgen_family;
3190 unsigned long last_id = cb->args[1];
3191 struct nf_conntrack_expect *exp;
3192
3193 rcu_read_lock();
3194 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
3195 restart:
3196 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
3197 hnode) {
3198 if (l3proto && exp->tuple.src.l3num != l3proto)
3199 continue;
3200
3201 if (!net_eq(nf_ct_net(exp->master), net))
3202 continue;
3203
3204 if (cb->args[1]) {
3205 if (ctnetlink_exp_id(exp) != last_id)
3206 continue;
3207 cb->args[1] = 0;
3208 }
3209 if (ctnetlink_exp_fill_info(skb,
3210 NETLINK_CB(cb->skb).portid,
3211 cb->nlh->nlmsg_seq,
3212 IPCTNL_MSG_EXP_NEW,
3213 exp) < 0) {
3214 cb->args[1] = ctnetlink_exp_id(exp);
3215 goto out;
3216 }
3217 }
3218 if (cb->args[1]) {
3219 cb->args[1] = 0;
3220 goto restart;
3221 }
3222 }
3223 out:
3224 rcu_read_unlock();
3225 return skb->len;
3226 }
3227
3228 static int
ctnetlink_exp_ct_dump_table(struct sk_buff * skb,struct netlink_callback * cb)3229 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3230 {
3231 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3232 struct nf_conn *ct = cb->data;
3233 struct nf_conn_help *help = nfct_help(ct);
3234 u_int8_t l3proto = nfmsg->nfgen_family;
3235 unsigned long last_id = cb->args[1];
3236 struct nf_conntrack_expect *exp;
3237
3238 if (cb->args[0])
3239 return 0;
3240
3241 rcu_read_lock();
3242
3243 restart:
3244 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
3245 if (l3proto && exp->tuple.src.l3num != l3proto)
3246 continue;
3247 if (cb->args[1]) {
3248 if (ctnetlink_exp_id(exp) != last_id)
3249 continue;
3250 cb->args[1] = 0;
3251 }
3252 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
3253 cb->nlh->nlmsg_seq,
3254 IPCTNL_MSG_EXP_NEW,
3255 exp) < 0) {
3256 cb->args[1] = ctnetlink_exp_id(exp);
3257 goto out;
3258 }
3259 }
3260 if (cb->args[1]) {
3261 cb->args[1] = 0;
3262 goto restart;
3263 }
3264 cb->args[0] = 1;
3265 out:
3266 rcu_read_unlock();
3267 return skb->len;
3268 }
3269
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)3270 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
3271 struct sk_buff *skb,
3272 const struct nlmsghdr *nlh,
3273 const struct nlattr * const cda[],
3274 struct netlink_ext_ack *extack)
3275 {
3276 int err;
3277 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3278 u_int8_t u3 = nfmsg->nfgen_family;
3279 struct nf_conntrack_tuple tuple;
3280 struct nf_conntrack_tuple_hash *h;
3281 struct nf_conn *ct;
3282 struct nf_conntrack_zone zone;
3283 struct netlink_dump_control c = {
3284 .dump = ctnetlink_exp_ct_dump_table,
3285 };
3286
3287 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3288 u3, NULL);
3289 if (err < 0)
3290 return err;
3291
3292 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3293 if (err < 0)
3294 return err;
3295
3296 h = nf_conntrack_find_get(net, &zone, &tuple);
3297 if (!h)
3298 return -ENOENT;
3299
3300 ct = nf_ct_tuplehash_to_ctrack(h);
3301 /* No expectation linked to this connection tracking. */
3302 if (!nfct_help(ct)) {
3303 nf_ct_put(ct);
3304 return 0;
3305 }
3306
3307 c.data = ct;
3308
3309 err = netlink_dump_start(ctnl, skb, nlh, &c);
3310 nf_ct_put(ct);
3311
3312 return err;
3313 }
3314
ctnetlink_get_expect(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])3315 static int ctnetlink_get_expect(struct sk_buff *skb,
3316 const struct nfnl_info *info,
3317 const struct nlattr * const cda[])
3318 {
3319 u_int8_t u3 = info->nfmsg->nfgen_family;
3320 struct nf_conntrack_tuple tuple;
3321 struct nf_conntrack_expect *exp;
3322 struct nf_conntrack_zone zone;
3323 struct sk_buff *skb2;
3324 int err;
3325
3326 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3327 if (cda[CTA_EXPECT_MASTER])
3328 return ctnetlink_dump_exp_ct(info->net, info->sk, skb,
3329 info->nlh, cda,
3330 info->extack);
3331 else {
3332 struct netlink_dump_control c = {
3333 .dump = ctnetlink_exp_dump_table,
3334 };
3335 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3336 }
3337 }
3338
3339 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3340 if (err < 0)
3341 return err;
3342
3343 if (cda[CTA_EXPECT_TUPLE])
3344 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3345 u3, NULL);
3346 else if (cda[CTA_EXPECT_MASTER])
3347 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3348 u3, NULL);
3349 else
3350 return -EINVAL;
3351
3352 if (err < 0)
3353 return err;
3354
3355 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3356 if (!exp)
3357 return -ENOENT;
3358
3359 if (cda[CTA_EXPECT_ID]) {
3360 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3361
3362 if (id != nf_expect_get_id(exp)) {
3363 nf_ct_expect_put(exp);
3364 return -ENOENT;
3365 }
3366 }
3367
3368 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3369 if (!skb2) {
3370 nf_ct_expect_put(exp);
3371 return -ENOMEM;
3372 }
3373
3374 rcu_read_lock();
3375 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3376 info->nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
3377 exp);
3378 rcu_read_unlock();
3379 nf_ct_expect_put(exp);
3380 if (err <= 0) {
3381 kfree_skb(skb2);
3382 return -ENOMEM;
3383 }
3384
3385 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
3386 }
3387
expect_iter_name(struct nf_conntrack_expect * exp,void * data)3388 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3389 {
3390 struct nf_conntrack_helper *helper;
3391 const struct nf_conn_help *m_help;
3392 const char *name = data;
3393
3394 m_help = nfct_help(exp->master);
3395
3396 helper = rcu_dereference(m_help->helper);
3397 if (!helper)
3398 return false;
3399
3400 return strcmp(helper->name, name) == 0;
3401 }
3402
expect_iter_all(struct nf_conntrack_expect * exp,void * data)3403 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3404 {
3405 return true;
3406 }
3407
ctnetlink_del_expect(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])3408 static int ctnetlink_del_expect(struct sk_buff *skb,
3409 const struct nfnl_info *info,
3410 const struct nlattr * const cda[])
3411 {
3412 u_int8_t u3 = info->nfmsg->nfgen_family;
3413 struct nf_conntrack_expect *exp;
3414 struct nf_conntrack_tuple tuple;
3415 struct nf_conntrack_zone zone;
3416 int err;
3417
3418 if (cda[CTA_EXPECT_TUPLE]) {
3419 /* delete a single expect by tuple */
3420 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3421 if (err < 0)
3422 return err;
3423
3424 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3425 u3, NULL);
3426 if (err < 0)
3427 return err;
3428
3429 /* bump usage count to 2 */
3430 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3431 if (!exp)
3432 return -ENOENT;
3433
3434 if (cda[CTA_EXPECT_ID]) {
3435 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3436
3437 if (id != nf_expect_get_id(exp)) {
3438 nf_ct_expect_put(exp);
3439 return -ENOENT;
3440 }
3441 }
3442
3443 /* after list removal, usage count == 1 */
3444 spin_lock_bh(&nf_conntrack_expect_lock);
3445 if (timer_delete(&exp->timeout)) {
3446 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3447 nlmsg_report(info->nlh));
3448 nf_ct_expect_put(exp);
3449 }
3450 spin_unlock_bh(&nf_conntrack_expect_lock);
3451 /* have to put what we 'get' above.
3452 * after this line usage count == 0 */
3453 nf_ct_expect_put(exp);
3454 } else if (cda[CTA_EXPECT_HELP_NAME]) {
3455 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3456
3457 nf_ct_expect_iterate_net(info->net, expect_iter_name, name,
3458 NETLINK_CB(skb).portid,
3459 nlmsg_report(info->nlh));
3460 } else {
3461 /* This basically means we have to flush everything*/
3462 nf_ct_expect_iterate_net(info->net, expect_iter_all, NULL,
3463 NETLINK_CB(skb).portid,
3464 nlmsg_report(info->nlh));
3465 }
3466
3467 return 0;
3468 }
3469 static int
ctnetlink_change_expect(struct nf_conntrack_expect * x,const struct nlattr * const cda[])3470 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3471 const struct nlattr * const cda[])
3472 {
3473 if (cda[CTA_EXPECT_TIMEOUT]) {
3474 if (!timer_delete(&x->timeout))
3475 return -ETIME;
3476
3477 x->timeout.expires = jiffies +
3478 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3479 add_timer(&x->timeout);
3480 }
3481 return 0;
3482 }
3483
3484 #if IS_ENABLED(CONFIG_NF_NAT)
3485 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3486 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3487 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3488 };
3489 #endif
3490
3491 static int
ctnetlink_parse_expect_nat(const struct nlattr * attr,struct nf_conntrack_expect * exp,u_int8_t u3)3492 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3493 struct nf_conntrack_expect *exp,
3494 u_int8_t u3)
3495 {
3496 #if IS_ENABLED(CONFIG_NF_NAT)
3497 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3498 struct nf_conntrack_tuple nat_tuple = {};
3499 int err;
3500
3501 err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3502 exp_nat_nla_policy, NULL);
3503 if (err < 0)
3504 return err;
3505
3506 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3507 return -EINVAL;
3508
3509 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3510 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3511 u3, NULL);
3512 if (err < 0)
3513 return err;
3514
3515 exp->saved_addr = nat_tuple.src.u3;
3516 exp->saved_proto = nat_tuple.src.u;
3517 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3518
3519 return 0;
3520 #else
3521 return -EOPNOTSUPP;
3522 #endif
3523 }
3524
3525 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)3526 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3527 struct nf_conntrack_helper *helper,
3528 struct nf_conntrack_tuple *tuple,
3529 struct nf_conntrack_tuple *mask)
3530 {
3531 u_int32_t class = 0;
3532 struct nf_conntrack_expect *exp;
3533 struct nf_conn_help *help;
3534 int err;
3535
3536 help = nfct_help(ct);
3537 if (!help)
3538 return ERR_PTR(-EOPNOTSUPP);
3539
3540 if (cda[CTA_EXPECT_CLASS] && helper) {
3541 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3542 if (class > helper->expect_class_max)
3543 return ERR_PTR(-EINVAL);
3544 }
3545 exp = nf_ct_expect_alloc(ct);
3546 if (!exp)
3547 return ERR_PTR(-ENOMEM);
3548
3549 if (cda[CTA_EXPECT_FLAGS]) {
3550 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3551 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3552 } else {
3553 exp->flags = 0;
3554 }
3555 if (cda[CTA_EXPECT_FN]) {
3556 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3557 struct nf_ct_helper_expectfn *expfn;
3558
3559 expfn = nf_ct_helper_expectfn_find_by_name(name);
3560 if (expfn == NULL) {
3561 err = -EINVAL;
3562 goto err_out;
3563 }
3564 exp->expectfn = expfn->expectfn;
3565 } else
3566 exp->expectfn = NULL;
3567
3568 exp->class = class;
3569 exp->master = ct;
3570 exp->helper = helper;
3571 exp->tuple = *tuple;
3572 exp->mask.src.u3 = mask->src.u3;
3573 exp->mask.src.u.all = mask->src.u.all;
3574
3575 if (cda[CTA_EXPECT_NAT]) {
3576 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3577 exp, nf_ct_l3num(ct));
3578 if (err < 0)
3579 goto err_out;
3580 }
3581 return exp;
3582 err_out:
3583 nf_ct_expect_put(exp);
3584 return ERR_PTR(err);
3585 }
3586
3587 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)3588 ctnetlink_create_expect(struct net *net,
3589 const struct nf_conntrack_zone *zone,
3590 const struct nlattr * const cda[],
3591 u_int8_t u3, u32 portid, int report)
3592 {
3593 struct nf_conntrack_tuple tuple, mask, master_tuple;
3594 struct nf_conntrack_tuple_hash *h = NULL;
3595 struct nf_conntrack_helper *helper = NULL;
3596 struct nf_conntrack_expect *exp;
3597 struct nf_conn *ct;
3598 int err;
3599
3600 /* caller guarantees that those three CTA_EXPECT_* exist */
3601 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3602 u3, NULL);
3603 if (err < 0)
3604 return err;
3605 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3606 u3, NULL);
3607 if (err < 0)
3608 return err;
3609 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3610 u3, NULL);
3611 if (err < 0)
3612 return err;
3613
3614 /* Look for master conntrack of this expectation */
3615 h = nf_conntrack_find_get(net, zone, &master_tuple);
3616 if (!h)
3617 return -ENOENT;
3618 ct = nf_ct_tuplehash_to_ctrack(h);
3619
3620 rcu_read_lock();
3621 if (cda[CTA_EXPECT_HELP_NAME]) {
3622 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3623
3624 helper = __nf_conntrack_helper_find(helpname, u3,
3625 nf_ct_protonum(ct));
3626 if (helper == NULL) {
3627 rcu_read_unlock();
3628 #ifdef CONFIG_MODULES
3629 if (request_module("nfct-helper-%s", helpname) < 0) {
3630 err = -EOPNOTSUPP;
3631 goto err_ct;
3632 }
3633 rcu_read_lock();
3634 helper = __nf_conntrack_helper_find(helpname, u3,
3635 nf_ct_protonum(ct));
3636 if (helper) {
3637 err = -EAGAIN;
3638 goto err_rcu;
3639 }
3640 rcu_read_unlock();
3641 #endif
3642 err = -EOPNOTSUPP;
3643 goto err_ct;
3644 }
3645 }
3646
3647 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3648 if (IS_ERR(exp)) {
3649 err = PTR_ERR(exp);
3650 goto err_rcu;
3651 }
3652
3653 err = nf_ct_expect_related_report(exp, portid, report, 0);
3654 nf_ct_expect_put(exp);
3655 err_rcu:
3656 rcu_read_unlock();
3657 err_ct:
3658 nf_ct_put(ct);
3659 return err;
3660 }
3661
ctnetlink_new_expect(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])3662 static int ctnetlink_new_expect(struct sk_buff *skb,
3663 const struct nfnl_info *info,
3664 const struct nlattr * const cda[])
3665 {
3666 u_int8_t u3 = info->nfmsg->nfgen_family;
3667 struct nf_conntrack_tuple tuple;
3668 struct nf_conntrack_expect *exp;
3669 struct nf_conntrack_zone zone;
3670 int err;
3671
3672 if (!cda[CTA_EXPECT_TUPLE]
3673 || !cda[CTA_EXPECT_MASK]
3674 || !cda[CTA_EXPECT_MASTER])
3675 return -EINVAL;
3676
3677 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3678 if (err < 0)
3679 return err;
3680
3681 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3682 u3, NULL);
3683 if (err < 0)
3684 return err;
3685
3686 spin_lock_bh(&nf_conntrack_expect_lock);
3687 exp = __nf_ct_expect_find(info->net, &zone, &tuple);
3688 if (!exp) {
3689 spin_unlock_bh(&nf_conntrack_expect_lock);
3690 err = -ENOENT;
3691 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
3692 err = ctnetlink_create_expect(info->net, &zone, cda, u3,
3693 NETLINK_CB(skb).portid,
3694 nlmsg_report(info->nlh));
3695 }
3696 return err;
3697 }
3698
3699 err = -EEXIST;
3700 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL))
3701 err = ctnetlink_change_expect(exp, cda);
3702 spin_unlock_bh(&nf_conntrack_expect_lock);
3703
3704 return err;
3705 }
3706
3707 static int
ctnetlink_exp_stat_fill_info(struct sk_buff * skb,u32 portid,u32 seq,int cpu,const struct ip_conntrack_stat * st)3708 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3709 const struct ip_conntrack_stat *st)
3710 {
3711 struct nlmsghdr *nlh;
3712 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3713
3714 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3715 IPCTNL_MSG_EXP_GET_STATS_CPU);
3716 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
3717 NFNETLINK_V0, htons(cpu));
3718 if (!nlh)
3719 goto nlmsg_failure;
3720
3721 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3722 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3723 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3724 goto nla_put_failure;
3725
3726 nlmsg_end(skb, nlh);
3727 return skb->len;
3728
3729 nla_put_failure:
3730 nlmsg_failure:
3731 nlmsg_cancel(skb, nlh);
3732 return -1;
3733 }
3734
3735 static int
ctnetlink_exp_stat_cpu_dump(struct sk_buff * skb,struct netlink_callback * cb)3736 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3737 {
3738 int cpu;
3739 struct net *net = sock_net(skb->sk);
3740
3741 if (cb->args[0] == nr_cpu_ids)
3742 return 0;
3743
3744 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3745 const struct ip_conntrack_stat *st;
3746
3747 if (!cpu_possible(cpu))
3748 continue;
3749
3750 st = per_cpu_ptr(net->ct.stat, cpu);
3751 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3752 cb->nlh->nlmsg_seq,
3753 cpu, st) < 0)
3754 break;
3755 }
3756 cb->args[0] = cpu;
3757
3758 return skb->len;
3759 }
3760
ctnetlink_stat_exp_cpu(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const cda[])3761 static int ctnetlink_stat_exp_cpu(struct sk_buff *skb,
3762 const struct nfnl_info *info,
3763 const struct nlattr * const cda[])
3764 {
3765 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3766 struct netlink_dump_control c = {
3767 .dump = ctnetlink_exp_stat_cpu_dump,
3768 };
3769 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3770 }
3771
3772 return 0;
3773 }
3774
3775 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3776 static struct nf_ct_event_notifier ctnl_notifier = {
3777 .ct_event = ctnetlink_conntrack_event,
3778 .exp_event = ctnetlink_expect_event,
3779 };
3780 #endif
3781
3782 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3783 [IPCTNL_MSG_CT_NEW] = {
3784 .call = ctnetlink_new_conntrack,
3785 .type = NFNL_CB_MUTEX,
3786 .attr_count = CTA_MAX,
3787 .policy = ct_nla_policy
3788 },
3789 [IPCTNL_MSG_CT_GET] = {
3790 .call = ctnetlink_get_conntrack,
3791 .type = NFNL_CB_MUTEX,
3792 .attr_count = CTA_MAX,
3793 .policy = ct_nla_policy
3794 },
3795 [IPCTNL_MSG_CT_DELETE] = {
3796 .call = ctnetlink_del_conntrack,
3797 .type = NFNL_CB_MUTEX,
3798 .attr_count = CTA_MAX,
3799 .policy = ct_nla_policy
3800 },
3801 [IPCTNL_MSG_CT_GET_CTRZERO] = {
3802 .call = ctnetlink_get_conntrack,
3803 .type = NFNL_CB_MUTEX,
3804 .attr_count = CTA_MAX,
3805 .policy = ct_nla_policy
3806 },
3807 [IPCTNL_MSG_CT_GET_STATS_CPU] = {
3808 .call = ctnetlink_stat_ct_cpu,
3809 .type = NFNL_CB_MUTEX,
3810 },
3811 [IPCTNL_MSG_CT_GET_STATS] = {
3812 .call = ctnetlink_stat_ct,
3813 .type = NFNL_CB_MUTEX,
3814 },
3815 [IPCTNL_MSG_CT_GET_DYING] = {
3816 .call = ctnetlink_get_ct_dying,
3817 .type = NFNL_CB_MUTEX,
3818 },
3819 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = {
3820 .call = ctnetlink_get_ct_unconfirmed,
3821 .type = NFNL_CB_MUTEX,
3822 },
3823 };
3824
3825 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3826 [IPCTNL_MSG_EXP_GET] = {
3827 .call = ctnetlink_get_expect,
3828 .type = NFNL_CB_MUTEX,
3829 .attr_count = CTA_EXPECT_MAX,
3830 .policy = exp_nla_policy
3831 },
3832 [IPCTNL_MSG_EXP_NEW] = {
3833 .call = ctnetlink_new_expect,
3834 .type = NFNL_CB_MUTEX,
3835 .attr_count = CTA_EXPECT_MAX,
3836 .policy = exp_nla_policy
3837 },
3838 [IPCTNL_MSG_EXP_DELETE] = {
3839 .call = ctnetlink_del_expect,
3840 .type = NFNL_CB_MUTEX,
3841 .attr_count = CTA_EXPECT_MAX,
3842 .policy = exp_nla_policy
3843 },
3844 [IPCTNL_MSG_EXP_GET_STATS_CPU] = {
3845 .call = ctnetlink_stat_exp_cpu,
3846 .type = NFNL_CB_MUTEX,
3847 },
3848 };
3849
3850 static const struct nfnetlink_subsystem ctnl_subsys = {
3851 .name = "conntrack",
3852 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3853 .cb_count = IPCTNL_MSG_MAX,
3854 .cb = ctnl_cb,
3855 };
3856
3857 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3858 .name = "conntrack_expect",
3859 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3860 .cb_count = IPCTNL_MSG_EXP_MAX,
3861 .cb = ctnl_exp_cb,
3862 };
3863
3864 MODULE_ALIAS("ip_conntrack_netlink");
3865 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3866 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3867
ctnetlink_net_init(struct net * net)3868 static int __net_init ctnetlink_net_init(struct net *net)
3869 {
3870 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3871 nf_conntrack_register_notifier(net, &ctnl_notifier);
3872 #endif
3873 return 0;
3874 }
3875
ctnetlink_net_pre_exit(struct net * net)3876 static void ctnetlink_net_pre_exit(struct net *net)
3877 {
3878 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3879 nf_conntrack_unregister_notifier(net);
3880 #endif
3881 }
3882
3883 static struct pernet_operations ctnetlink_net_ops = {
3884 .init = ctnetlink_net_init,
3885 .pre_exit = ctnetlink_net_pre_exit,
3886 };
3887
ctnetlink_init(void)3888 static int __init ctnetlink_init(void)
3889 {
3890 int ret;
3891
3892 NL_ASSERT_CTX_FITS(struct ctnetlink_list_dump_ctx);
3893
3894 ret = nfnetlink_subsys_register(&ctnl_subsys);
3895 if (ret < 0) {
3896 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3897 goto err_out;
3898 }
3899
3900 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3901 if (ret < 0) {
3902 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3903 goto err_unreg_subsys;
3904 }
3905
3906 ret = register_pernet_subsys(&ctnetlink_net_ops);
3907 if (ret < 0) {
3908 pr_err("ctnetlink_init: cannot register pernet operations\n");
3909 goto err_unreg_exp_subsys;
3910 }
3911 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3912 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3913 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3914 #endif
3915 return 0;
3916
3917 err_unreg_exp_subsys:
3918 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3919 err_unreg_subsys:
3920 nfnetlink_subsys_unregister(&ctnl_subsys);
3921 err_out:
3922 return ret;
3923 }
3924
ctnetlink_exit(void)3925 static void __exit ctnetlink_exit(void)
3926 {
3927 unregister_pernet_subsys(&ctnetlink_net_ops);
3928 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3929 nfnetlink_subsys_unregister(&ctnl_subsys);
3930 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3931 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3932 #endif
3933 synchronize_rcu();
3934 }
3935
3936 module_init(ctnetlink_init);
3937 module_exit(ctnetlink_exit);
3938