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