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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
59MODULE_LICENSE("GPL");
60
61static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
62 const struct nf_conntrack_tuple *tuple,
63 const struct nf_conntrack_l4proto *l4proto)
64{
65 int ret = 0;
66 struct nlattr *nest_parms;
67
68 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO);
69 if (!nest_parms)
70 goto nla_put_failure;
71 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
72 goto nla_put_failure;
73
74 if (likely(l4proto->tuple_to_nlattr))
75 ret = l4proto->tuple_to_nlattr(skb, tuple);
76
77 nla_nest_end(skb, nest_parms);
78
79 return ret;
80
81nla_put_failure:
82 return -1;
83}
84
85static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
86 const struct nf_conntrack_tuple *tuple)
87{
88 if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
89 nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
90 return -EMSGSIZE;
91 return 0;
92}
93
94static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
95 const struct nf_conntrack_tuple *tuple)
96{
97 if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
98 nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
99 return -EMSGSIZE;
100 return 0;
101}
102
103static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
104 const struct nf_conntrack_tuple *tuple)
105{
106 int ret = 0;
107 struct nlattr *nest_parms;
108
109 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP);
110 if (!nest_parms)
111 goto nla_put_failure;
112
113 switch (tuple->src.l3num) {
114 case NFPROTO_IPV4:
115 ret = ipv4_tuple_to_nlattr(skb, tuple);
116 break;
117 case NFPROTO_IPV6:
118 ret = ipv6_tuple_to_nlattr(skb, tuple);
119 break;
120 }
121
122 nla_nest_end(skb, nest_parms);
123
124 return ret;
125
126nla_put_failure:
127 return -1;
128}
129
130static int ctnetlink_dump_tuples(struct sk_buff *skb,
131 const struct nf_conntrack_tuple *tuple)
132{
133 const struct nf_conntrack_l4proto *l4proto;
134 int ret;
135
136 rcu_read_lock();
137 ret = ctnetlink_dump_tuples_ip(skb, tuple);
138
139 if (ret >= 0) {
140 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
141 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
142 }
143 rcu_read_unlock();
144 return ret;
145}
146
147static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
148 const struct nf_conntrack_zone *zone, int dir)
149{
150 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
151 return 0;
152 if (nla_put_be16(skb, attrtype, htons(zone->id)))
153 goto nla_put_failure;
154 return 0;
155
156nla_put_failure:
157 return -1;
158}
159
160static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
161{
162 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
163 goto nla_put_failure;
164 return 0;
165
166nla_put_failure:
167 return -1;
168}
169
170static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct,
171 bool skip_zero)
172{
173 long timeout = nf_ct_expires(ct) / HZ;
174
175 if (skip_zero && timeout == 0)
176 return 0;
177
178 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
179 goto nla_put_failure;
180 return 0;
181
182nla_put_failure:
183 return -1;
184}
185
186static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct,
187 bool destroy)
188{
189 const struct nf_conntrack_l4proto *l4proto;
190 struct nlattr *nest_proto;
191 int ret;
192
193 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
194 if (!l4proto->to_nlattr)
195 return 0;
196
197 nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
198 if (!nest_proto)
199 goto nla_put_failure;
200
201 ret = l4proto->to_nlattr(skb, nest_proto, ct, destroy);
202
203 nla_nest_end(skb, nest_proto);
204
205 return ret;
206
207nla_put_failure:
208 return -1;
209}
210
211static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
212 const struct nf_conn *ct)
213{
214 struct nlattr *nest_helper;
215 const struct nf_conn_help *help = nfct_help(ct);
216 struct nf_conntrack_helper *helper;
217
218 if (!help)
219 return 0;
220
221 rcu_read_lock();
222 helper = rcu_dereference(help->helper);
223 if (!helper)
224 goto out;
225
226 nest_helper = nla_nest_start(skb, CTA_HELP);
227 if (!nest_helper)
228 goto nla_put_failure;
229 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
230 goto nla_put_failure;
231
232 if (helper->to_nlattr)
233 helper->to_nlattr(skb, ct);
234
235 nla_nest_end(skb, nest_helper);
236out:
237 rcu_read_unlock();
238 return 0;
239
240nla_put_failure:
241 rcu_read_unlock();
242 return -1;
243}
244
245static int
246dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
247 enum ip_conntrack_dir dir, int type)
248{
249 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
250 struct nf_conn_counter *counter = acct->counter;
251 struct nlattr *nest_count;
252 u64 pkts, bytes;
253
254 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
255 pkts = atomic64_xchg(&counter[dir].packets, 0);
256 bytes = atomic64_xchg(&counter[dir].bytes, 0);
257 } else {
258 pkts = atomic64_read(&counter[dir].packets);
259 bytes = atomic64_read(&counter[dir].bytes);
260 }
261
262 nest_count = nla_nest_start(skb, attr);
263 if (!nest_count)
264 goto nla_put_failure;
265
266 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
267 CTA_COUNTERS_PAD) ||
268 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
269 CTA_COUNTERS_PAD))
270 goto nla_put_failure;
271
272 nla_nest_end(skb, nest_count);
273
274 return 0;
275
276nla_put_failure:
277 return -1;
278}
279
280static int
281ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
282{
283 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
284
285 if (!acct)
286 return 0;
287
288 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
289 return -1;
290 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
291 return -1;
292
293 return 0;
294}
295
296static int
297ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
298{
299 struct nlattr *nest_count;
300 const struct nf_conn_tstamp *tstamp;
301
302 tstamp = nf_conn_tstamp_find(ct);
303 if (!tstamp)
304 return 0;
305
306 nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
307 if (!nest_count)
308 goto nla_put_failure;
309
310 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
311 CTA_TIMESTAMP_PAD) ||
312 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
313 cpu_to_be64(tstamp->stop),
314 CTA_TIMESTAMP_PAD)))
315 goto nla_put_failure;
316 nla_nest_end(skb, nest_count);
317
318 return 0;
319
320nla_put_failure:
321 return -1;
322}
323
324#ifdef CONFIG_NF_CONNTRACK_MARK
325static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
326{
327 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
328 goto nla_put_failure;
329 return 0;
330
331nla_put_failure:
332 return -1;
333}
334#else
335#define ctnetlink_dump_mark(a, b) (0)
336#endif
337
338#ifdef CONFIG_NF_CONNTRACK_SECMARK
339static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
340{
341 struct nlattr *nest_secctx;
342 int len, ret;
343 char *secctx;
344
345 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
346 if (ret)
347 return 0;
348
349 ret = -1;
350 nest_secctx = nla_nest_start(skb, CTA_SECCTX);
351 if (!nest_secctx)
352 goto nla_put_failure;
353
354 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
355 goto nla_put_failure;
356 nla_nest_end(skb, nest_secctx);
357
358 ret = 0;
359nla_put_failure:
360 security_release_secctx(secctx, len);
361 return ret;
362}
363#else
364#define ctnetlink_dump_secctx(a, b) (0)
365#endif
366
367#ifdef CONFIG_NF_CONNTRACK_LABELS
368static inline int ctnetlink_label_size(const struct nf_conn *ct)
369{
370 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
371
372 if (!labels)
373 return 0;
374 return nla_total_size(sizeof(labels->bits));
375}
376
377static int
378ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
379{
380 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
381 unsigned int i;
382
383 if (!labels)
384 return 0;
385
386 i = 0;
387 do {
388 if (labels->bits[i] != 0)
389 return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
390 labels->bits);
391 i++;
392 } while (i < ARRAY_SIZE(labels->bits));
393
394 return 0;
395}
396#else
397#define ctnetlink_dump_labels(a, b) (0)
398#define ctnetlink_label_size(a) (0)
399#endif
400
401#define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
402
403static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
404{
405 struct nlattr *nest_parms;
406
407 if (!(ct->status & IPS_EXPECTED))
408 return 0;
409
410 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
411 if (!nest_parms)
412 goto nla_put_failure;
413 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
414 goto nla_put_failure;
415 nla_nest_end(skb, nest_parms);
416
417 return 0;
418
419nla_put_failure:
420 return -1;
421}
422
423static int
424dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
425{
426 struct nlattr *nest_parms;
427
428 nest_parms = nla_nest_start(skb, type);
429 if (!nest_parms)
430 goto nla_put_failure;
431
432 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
433 htonl(seq->correction_pos)) ||
434 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
435 htonl(seq->offset_before)) ||
436 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
437 htonl(seq->offset_after)))
438 goto nla_put_failure;
439
440 nla_nest_end(skb, nest_parms);
441
442 return 0;
443
444nla_put_failure:
445 return -1;
446}
447
448static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
449{
450 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
451 struct nf_ct_seqadj *seq;
452
453 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
454 return 0;
455
456 spin_lock_bh(&ct->lock);
457 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
458 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
459 goto err;
460
461 seq = &seqadj->seq[IP_CT_DIR_REPLY];
462 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
463 goto err;
464
465 spin_unlock_bh(&ct->lock);
466 return 0;
467err:
468 spin_unlock_bh(&ct->lock);
469 return -1;
470}
471
472static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
473{
474 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
475 struct nlattr *nest_parms;
476
477 if (!synproxy)
478 return 0;
479
480 nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
481 if (!nest_parms)
482 goto nla_put_failure;
483
484 if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
485 nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
486 nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
487 goto nla_put_failure;
488
489 nla_nest_end(skb, nest_parms);
490
491 return 0;
492
493nla_put_failure:
494 return -1;
495}
496
497static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
498{
499 __be32 id = (__force __be32)nf_ct_get_id(ct);
500
501 if (nla_put_be32(skb, CTA_ID, id))
502 goto nla_put_failure;
503 return 0;
504
505nla_put_failure:
506 return -1;
507}
508
509static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
510{
511 if (nla_put_be32(skb, CTA_USE, htonl(refcount_read(&ct->ct_general.use))))
512 goto nla_put_failure;
513 return 0;
514
515nla_put_failure:
516 return -1;
517}
518
519
520
521
522
523static int ctnetlink_dump_extinfo(struct sk_buff *skb,
524 struct nf_conn *ct, u32 type)
525{
526 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
527 ctnetlink_dump_timestamp(skb, ct) < 0 ||
528 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
529 ctnetlink_dump_labels(skb, ct) < 0 ||
530 ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
531 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
532 return -1;
533
534 return 0;
535}
536
537static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
538{
539 if (ctnetlink_dump_status(skb, ct) < 0 ||
540 ctnetlink_dump_mark(skb, ct) < 0 ||
541 ctnetlink_dump_secctx(skb, ct) < 0 ||
542 ctnetlink_dump_id(skb, ct) < 0 ||
543 ctnetlink_dump_use(skb, ct) < 0 ||
544 ctnetlink_dump_master(skb, ct) < 0)
545 return -1;
546
547 if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
548 (ctnetlink_dump_timeout(skb, ct, false) < 0 ||
549 ctnetlink_dump_protoinfo(skb, ct, false) < 0))
550 return -1;
551
552 return 0;
553}
554
555static int
556ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
557 struct nf_conn *ct, bool extinfo, unsigned int flags)
558{
559 const struct nf_conntrack_zone *zone;
560 struct nlmsghdr *nlh;
561 struct nlattr *nest_parms;
562 unsigned int event;
563
564 if (portid)
565 flags |= NLM_F_MULTI;
566 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
567 nlh = nfnl_msg_put(skb, portid, seq, event, flags, nf_ct_l3num(ct),
568 NFNETLINK_V0, 0);
569 if (!nlh)
570 goto nlmsg_failure;
571
572 zone = nf_ct_zone(ct);
573
574 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
575 if (!nest_parms)
576 goto nla_put_failure;
577 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
578 goto nla_put_failure;
579 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
580 NF_CT_ZONE_DIR_ORIG) < 0)
581 goto nla_put_failure;
582 nla_nest_end(skb, nest_parms);
583
584 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
585 if (!nest_parms)
586 goto nla_put_failure;
587 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
588 goto nla_put_failure;
589 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
590 NF_CT_ZONE_DIR_REPL) < 0)
591 goto nla_put_failure;
592 nla_nest_end(skb, nest_parms);
593
594 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
595 NF_CT_DEFAULT_ZONE_DIR) < 0)
596 goto nla_put_failure;
597
598 if (ctnetlink_dump_info(skb, ct) < 0)
599 goto nla_put_failure;
600 if (extinfo && ctnetlink_dump_extinfo(skb, ct, type) < 0)
601 goto nla_put_failure;
602
603 nlmsg_end(skb, nlh);
604 return skb->len;
605
606nlmsg_failure:
607nla_put_failure:
608 nlmsg_cancel(skb, nlh);
609 return -1;
610}
611
612static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
613 [CTA_IP_V4_SRC] = { .type = NLA_U32 },
614 [CTA_IP_V4_DST] = { .type = NLA_U32 },
615 [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
616 [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
617};
618
619#if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
620static size_t ctnetlink_proto_size(const struct nf_conn *ct)
621{
622 const struct nf_conntrack_l4proto *l4proto;
623 size_t len, len4 = 0;
624
625 len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
626 len *= 3u;
627
628 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
629 len += l4proto->nlattr_size;
630 if (l4proto->nlattr_tuple_size) {
631 len4 = l4proto->nlattr_tuple_size();
632 len4 *= 3u;
633 }
634
635 return len + len4;
636}
637#endif
638
639static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
640{
641 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
642 return 0;
643 return 2 * nla_total_size(0)
644 + 2 * nla_total_size_64bit(sizeof(uint64_t))
645 + 2 * nla_total_size_64bit(sizeof(uint64_t))
646 ;
647}
648
649static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
650{
651#ifdef CONFIG_NF_CONNTRACK_SECMARK
652 int len, ret;
653
654 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
655 if (ret)
656 return 0;
657
658 return nla_total_size(0)
659 + nla_total_size(sizeof(char) * len);
660#else
661 return 0;
662#endif
663}
664
665static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
666{
667#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
668 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
669 return 0;
670 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
671#else
672 return 0;
673#endif
674}
675
676#ifdef CONFIG_NF_CONNTRACK_EVENTS
677static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
678{
679 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
680 + 3 * nla_total_size(0)
681 + 3 * nla_total_size(0)
682 + 3 * nla_total_size(0)
683 + 3 * nla_total_size(sizeof(u_int8_t))
684 + nla_total_size(sizeof(u_int32_t))
685 + nla_total_size(sizeof(u_int32_t))
686 + ctnetlink_acct_size(ct)
687 + ctnetlink_timestamp_size(ct)
688 + nla_total_size(sizeof(u_int32_t))
689 + nla_total_size(0)
690 + nla_total_size(0)
691 + nla_total_size(NF_CT_HELPER_NAME_LEN)
692 + ctnetlink_secctx_size(ct)
693#if IS_ENABLED(CONFIG_NF_NAT)
694 + 2 * nla_total_size(0)
695 + 6 * nla_total_size(sizeof(u_int32_t))
696#endif
697#ifdef CONFIG_NF_CONNTRACK_MARK
698 + nla_total_size(sizeof(u_int32_t))
699#endif
700#ifdef CONFIG_NF_CONNTRACK_ZONES
701 + nla_total_size(sizeof(u_int16_t))
702#endif
703 + ctnetlink_proto_size(ct)
704 + ctnetlink_label_size(ct)
705 ;
706}
707
708static int
709ctnetlink_conntrack_event(unsigned int events, const struct nf_ct_event *item)
710{
711 const struct nf_conntrack_zone *zone;
712 struct net *net;
713 struct nlmsghdr *nlh;
714 struct nlattr *nest_parms;
715 struct nf_conn *ct = item->ct;
716 struct sk_buff *skb;
717 unsigned int type;
718 unsigned int flags = 0, group;
719 int err;
720
721 if (events & (1 << IPCT_DESTROY)) {
722 type = IPCTNL_MSG_CT_DELETE;
723 group = NFNLGRP_CONNTRACK_DESTROY;
724 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
725 type = IPCTNL_MSG_CT_NEW;
726 flags = NLM_F_CREATE|NLM_F_EXCL;
727 group = NFNLGRP_CONNTRACK_NEW;
728 } else if (events) {
729 type = IPCTNL_MSG_CT_NEW;
730 group = NFNLGRP_CONNTRACK_UPDATE;
731 } else
732 return 0;
733
734 net = nf_ct_net(ct);
735 if (!item->report && !nfnetlink_has_listeners(net, group))
736 return 0;
737
738 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
739 if (skb == NULL)
740 goto errout;
741
742 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
743 nlh = nfnl_msg_put(skb, item->portid, 0, type, flags, nf_ct_l3num(ct),
744 NFNETLINK_V0, 0);
745 if (!nlh)
746 goto nlmsg_failure;
747
748 zone = nf_ct_zone(ct);
749
750 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
751 if (!nest_parms)
752 goto nla_put_failure;
753 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
754 goto nla_put_failure;
755 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
756 NF_CT_ZONE_DIR_ORIG) < 0)
757 goto nla_put_failure;
758 nla_nest_end(skb, nest_parms);
759
760 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
761 if (!nest_parms)
762 goto nla_put_failure;
763 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
764 goto nla_put_failure;
765 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
766 NF_CT_ZONE_DIR_REPL) < 0)
767 goto nla_put_failure;
768 nla_nest_end(skb, nest_parms);
769
770 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
771 NF_CT_DEFAULT_ZONE_DIR) < 0)
772 goto nla_put_failure;
773
774 if (ctnetlink_dump_id(skb, ct) < 0)
775 goto nla_put_failure;
776
777 if (ctnetlink_dump_status(skb, ct) < 0)
778 goto nla_put_failure;
779
780 if (events & (1 << IPCT_DESTROY)) {
781 if (ctnetlink_dump_timeout(skb, ct, true) < 0)
782 goto nla_put_failure;
783
784 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
785 ctnetlink_dump_timestamp(skb, ct) < 0 ||
786 ctnetlink_dump_protoinfo(skb, ct, true) < 0)
787 goto nla_put_failure;
788 } else {
789 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
790 goto nla_put_failure;
791
792 if (events & (1 << IPCT_PROTOINFO) &&
793 ctnetlink_dump_protoinfo(skb, ct, false) < 0)
794 goto nla_put_failure;
795
796 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
797 && ctnetlink_dump_helpinfo(skb, ct) < 0)
798 goto nla_put_failure;
799
800#ifdef CONFIG_NF_CONNTRACK_SECMARK
801 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
802 && ctnetlink_dump_secctx(skb, ct) < 0)
803 goto nla_put_failure;
804#endif
805 if (events & (1 << IPCT_LABEL) &&
806 ctnetlink_dump_labels(skb, ct) < 0)
807 goto nla_put_failure;
808
809 if (events & (1 << IPCT_RELATED) &&
810 ctnetlink_dump_master(skb, ct) < 0)
811 goto nla_put_failure;
812
813 if (events & (1 << IPCT_SEQADJ) &&
814 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
815 goto nla_put_failure;
816
817 if (events & (1 << IPCT_SYNPROXY) &&
818 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
819 goto nla_put_failure;
820 }
821
822#ifdef CONFIG_NF_CONNTRACK_MARK
823 if ((events & (1 << IPCT_MARK) || ct->mark)
824 && ctnetlink_dump_mark(skb, ct) < 0)
825 goto nla_put_failure;
826#endif
827 nlmsg_end(skb, nlh);
828 err = nfnetlink_send(skb, net, item->portid, group, item->report,
829 GFP_ATOMIC);
830 if (err == -ENOBUFS || err == -EAGAIN)
831 return -ENOBUFS;
832
833 return 0;
834
835nla_put_failure:
836 nlmsg_cancel(skb, nlh);
837nlmsg_failure:
838 kfree_skb(skb);
839errout:
840 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
841 return -ENOBUFS;
842
843 return 0;
844}
845#endif
846
847static int ctnetlink_done(struct netlink_callback *cb)
848{
849 if (cb->args[1])
850 nf_ct_put((struct nf_conn *)cb->args[1]);
851 kfree(cb->data);
852 return 0;
853}
854
855struct ctnetlink_filter_u32 {
856 u32 val;
857 u32 mask;
858};
859
860struct ctnetlink_filter {
861 u8 family;
862
863 u_int32_t orig_flags;
864 u_int32_t reply_flags;
865
866 struct nf_conntrack_tuple orig;
867 struct nf_conntrack_tuple reply;
868 struct nf_conntrack_zone zone;
869
870 struct ctnetlink_filter_u32 mark;
871 struct ctnetlink_filter_u32 status;
872};
873
874static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
875 [CTA_FILTER_ORIG_FLAGS] = { .type = NLA_U32 },
876 [CTA_FILTER_REPLY_FLAGS] = { .type = NLA_U32 },
877};
878
879static int ctnetlink_parse_filter(const struct nlattr *attr,
880 struct ctnetlink_filter *filter)
881{
882 struct nlattr *tb[CTA_FILTER_MAX + 1];
883 int ret = 0;
884
885 ret = nla_parse_nested(tb, CTA_FILTER_MAX, attr, cta_filter_nla_policy,
886 NULL);
887 if (ret)
888 return ret;
889
890 if (tb[CTA_FILTER_ORIG_FLAGS]) {
891 filter->orig_flags = nla_get_u32(tb[CTA_FILTER_ORIG_FLAGS]);
892 if (filter->orig_flags & ~CTA_FILTER_F_ALL)
893 return -EOPNOTSUPP;
894 }
895
896 if (tb[CTA_FILTER_REPLY_FLAGS]) {
897 filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
898 if (filter->reply_flags & ~CTA_FILTER_F_ALL)
899 return -EOPNOTSUPP;
900 }
901
902 return 0;
903}
904
905static int ctnetlink_parse_zone(const struct nlattr *attr,
906 struct nf_conntrack_zone *zone);
907static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
908 struct nf_conntrack_tuple *tuple,
909 u32 type, u_int8_t l3num,
910 struct nf_conntrack_zone *zone,
911 u_int32_t flags);
912
913static int ctnetlink_filter_parse_mark(struct ctnetlink_filter_u32 *mark,
914 const struct nlattr * const cda[])
915{
916#ifdef CONFIG_NF_CONNTRACK_MARK
917 if (cda[CTA_MARK]) {
918 mark->val = ntohl(nla_get_be32(cda[CTA_MARK]));
919
920 if (cda[CTA_MARK_MASK])
921 mark->mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
922 else
923 mark->mask = 0xffffffff;
924 } else if (cda[CTA_MARK_MASK]) {
925 return -EINVAL;
926 }
927#endif
928 return 0;
929}
930
931static int ctnetlink_filter_parse_status(struct ctnetlink_filter_u32 *status,
932 const struct nlattr * const cda[])
933{
934 if (cda[CTA_STATUS]) {
935 status->val = ntohl(nla_get_be32(cda[CTA_STATUS]));
936 if (cda[CTA_STATUS_MASK])
937 status->mask = ntohl(nla_get_be32(cda[CTA_STATUS_MASK]));
938 else
939 status->mask = status->val;
940
941
942 if (status->mask == 0)
943 return -EINVAL;
944 } else if (cda[CTA_STATUS_MASK]) {
945 return -EINVAL;
946 }
947
948
949 BUILD_BUG_ON(__IPS_MAX_BIT >= 32);
950 return 0;
951}
952
953static struct ctnetlink_filter *
954ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
955{
956 struct ctnetlink_filter *filter;
957 int err;
958
959#ifndef CONFIG_NF_CONNTRACK_MARK
960 if (cda[CTA_MARK] || cda[CTA_MARK_MASK])
961 return ERR_PTR(-EOPNOTSUPP);
962#endif
963
964 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
965 if (filter == NULL)
966 return ERR_PTR(-ENOMEM);
967
968 filter->family = family;
969
970 err = ctnetlink_filter_parse_mark(&filter->mark, cda);
971 if (err)
972 goto err_filter;
973
974 err = ctnetlink_filter_parse_status(&filter->status, cda);
975 if (err)
976 goto err_filter;
977
978 if (!cda[CTA_FILTER])
979 return filter;
980
981 err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
982 if (err < 0)
983 goto err_filter;
984
985 err = ctnetlink_parse_filter(cda[CTA_FILTER], filter);
986 if (err < 0)
987 goto err_filter;
988
989 if (filter->orig_flags) {
990 if (!cda[CTA_TUPLE_ORIG]) {
991 err = -EINVAL;
992 goto err_filter;
993 }
994
995 err = ctnetlink_parse_tuple_filter(cda, &filter->orig,
996 CTA_TUPLE_ORIG,
997 filter->family,
998 &filter->zone,
999 filter->orig_flags);
1000 if (err < 0)
1001 goto err_filter;
1002 }
1003
1004 if (filter->reply_flags) {
1005 if (!cda[CTA_TUPLE_REPLY]) {
1006 err = -EINVAL;
1007 goto err_filter;
1008 }
1009
1010 err = ctnetlink_parse_tuple_filter(cda, &filter->reply,
1011 CTA_TUPLE_REPLY,
1012 filter->family,
1013 &filter->zone,
1014 filter->reply_flags);
1015 if (err < 0)
1016 goto err_filter;
1017 }
1018
1019 return filter;
1020
1021err_filter:
1022 kfree(filter);
1023
1024 return ERR_PTR(err);
1025}
1026
1027static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
1028{
1029 return family || cda[CTA_MARK] || cda[CTA_FILTER] || cda[CTA_STATUS];
1030}
1031
1032static int ctnetlink_start(struct netlink_callback *cb)
1033{
1034 const struct nlattr * const *cda = cb->data;
1035 struct ctnetlink_filter *filter = NULL;
1036 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1037 u8 family = nfmsg->nfgen_family;
1038
1039 if (ctnetlink_needs_filter(family, cda)) {
1040 filter = ctnetlink_alloc_filter(cda, family);
1041 if (IS_ERR(filter))
1042 return PTR_ERR(filter);
1043 }
1044
1045 cb->data = filter;
1046 return 0;
1047}
1048
1049static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
1050 struct nf_conntrack_tuple *ct_tuple,
1051 u_int32_t flags, int family)
1052{
1053 switch (family) {
1054 case NFPROTO_IPV4:
1055 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1056 filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
1057 return 0;
1058
1059 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1060 filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
1061 return 0;
1062 break;
1063 case NFPROTO_IPV6:
1064 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1065 !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
1066 &ct_tuple->src.u3.in6))
1067 return 0;
1068
1069 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1070 !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
1071 &ct_tuple->dst.u3.in6))
1072 return 0;
1073 break;
1074 }
1075
1076 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
1077 filter_tuple->dst.protonum != ct_tuple->dst.protonum)
1078 return 0;
1079
1080 switch (ct_tuple->dst.protonum) {
1081 case IPPROTO_TCP:
1082 case IPPROTO_UDP:
1083 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
1084 filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
1085 return 0;
1086
1087 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
1088 filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
1089 return 0;
1090 break;
1091 case IPPROTO_ICMP:
1092 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
1093 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1094 return 0;
1095 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
1096 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1097 return 0;
1098 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
1099 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1100 return 0;
1101 break;
1102 case IPPROTO_ICMPV6:
1103 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
1104 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1105 return 0;
1106 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
1107 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1108 return 0;
1109 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
1110 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1111 return 0;
1112 break;
1113 }
1114
1115 return 1;
1116}
1117
1118static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
1119{
1120 struct ctnetlink_filter *filter = data;
1121 struct nf_conntrack_tuple *tuple;
1122 u32 status;
1123
1124 if (filter == NULL)
1125 goto out;
1126
1127
1128
1129
1130
1131 if (filter->family && nf_ct_l3num(ct) != filter->family)
1132 goto ignore_entry;
1133
1134 if (filter->orig_flags) {
1135 tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
1136 if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
1137 filter->orig_flags,
1138 filter->family))
1139 goto ignore_entry;
1140 }
1141
1142 if (filter->reply_flags) {
1143 tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
1144 if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
1145 filter->reply_flags,
1146 filter->family))
1147 goto ignore_entry;
1148 }
1149
1150#ifdef CONFIG_NF_CONNTRACK_MARK
1151 if ((ct->mark & filter->mark.mask) != filter->mark.val)
1152 goto ignore_entry;
1153#endif
1154 status = (u32)READ_ONCE(ct->status);
1155 if ((status & filter->status.mask) != filter->status.val)
1156 goto ignore_entry;
1157
1158out:
1159 return 1;
1160
1161ignore_entry:
1162 return 0;
1163}
1164
1165static int
1166ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1167{
1168 unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
1169 struct net *net = sock_net(skb->sk);
1170 struct nf_conn *ct, *last;
1171 struct nf_conntrack_tuple_hash *h;
1172 struct hlist_nulls_node *n;
1173 struct nf_conn *nf_ct_evict[8];
1174 int res, i;
1175 spinlock_t *lockp;
1176
1177 last = (struct nf_conn *)cb->args[1];
1178 i = 0;
1179
1180 local_bh_disable();
1181 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
1182restart:
1183 while (i) {
1184 i--;
1185 if (nf_ct_should_gc(nf_ct_evict[i]))
1186 nf_ct_kill(nf_ct_evict[i]);
1187 nf_ct_put(nf_ct_evict[i]);
1188 }
1189
1190 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
1191 nf_conntrack_lock(lockp);
1192 if (cb->args[0] >= nf_conntrack_htable_size) {
1193 spin_unlock(lockp);
1194 goto out;
1195 }
1196 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
1197 hnnode) {
1198 ct = nf_ct_tuplehash_to_ctrack(h);
1199 if (nf_ct_is_expired(ct)) {
1200 if (i < ARRAY_SIZE(nf_ct_evict) &&
1201 refcount_inc_not_zero(&ct->ct_general.use))
1202 nf_ct_evict[i++] = ct;
1203 continue;
1204 }
1205
1206 if (!net_eq(net, nf_ct_net(ct)))
1207 continue;
1208
1209 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
1210 continue;
1211
1212 if (cb->args[1]) {
1213 if (ct != last)
1214 continue;
1215 cb->args[1] = 0;
1216 }
1217 if (!ctnetlink_filter_match(ct, cb->data))
1218 continue;
1219
1220 res =
1221 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1222 cb->nlh->nlmsg_seq,
1223 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1224 ct, true, flags);
1225 if (res < 0) {
1226 nf_conntrack_get(&ct->ct_general);
1227 cb->args[1] = (unsigned long)ct;
1228 spin_unlock(lockp);
1229 goto out;
1230 }
1231 }
1232 spin_unlock(lockp);
1233 if (cb->args[1]) {
1234 cb->args[1] = 0;
1235 goto restart;
1236 }
1237 }
1238out:
1239 local_bh_enable();
1240 if (last) {
1241
1242 if ((struct nf_conn *)cb->args[1] == last)
1243 cb->args[1] = 0;
1244
1245 nf_ct_put(last);
1246 }
1247
1248 while (i) {
1249 i--;
1250 if (nf_ct_should_gc(nf_ct_evict[i]))
1251 nf_ct_kill(nf_ct_evict[i]);
1252 nf_ct_put(nf_ct_evict[i]);
1253 }
1254
1255 return skb->len;
1256}
1257
1258static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
1259 struct nf_conntrack_tuple *t,
1260 u_int32_t flags)
1261{
1262 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1263 if (!tb[CTA_IP_V4_SRC])
1264 return -EINVAL;
1265
1266 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1267 }
1268
1269 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1270 if (!tb[CTA_IP_V4_DST])
1271 return -EINVAL;
1272
1273 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1274 }
1275
1276 return 0;
1277}
1278
1279static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1280 struct nf_conntrack_tuple *t,
1281 u_int32_t flags)
1282{
1283 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1284 if (!tb[CTA_IP_V6_SRC])
1285 return -EINVAL;
1286
1287 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1288 }
1289
1290 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1291 if (!tb[CTA_IP_V6_DST])
1292 return -EINVAL;
1293
1294 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1295 }
1296
1297 return 0;
1298}
1299
1300static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1301 struct nf_conntrack_tuple *tuple,
1302 u_int32_t flags)
1303{
1304 struct nlattr *tb[CTA_IP_MAX+1];
1305 int ret = 0;
1306
1307 ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
1308 if (ret < 0)
1309 return ret;
1310
1311 ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
1312 cta_ip_nla_policy, NULL);
1313 if (ret)
1314 return ret;
1315
1316 switch (tuple->src.l3num) {
1317 case NFPROTO_IPV4:
1318 ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
1319 break;
1320 case NFPROTO_IPV6:
1321 ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
1322 break;
1323 }
1324
1325 return ret;
1326}
1327
1328static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1329 [CTA_PROTO_NUM] = { .type = NLA_U8 },
1330};
1331
1332static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1333 struct nf_conntrack_tuple *tuple,
1334 u_int32_t flags)
1335{
1336 const struct nf_conntrack_l4proto *l4proto;
1337 struct nlattr *tb[CTA_PROTO_MAX+1];
1338 int ret = 0;
1339
1340 ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1341 proto_nla_policy, NULL);
1342 if (ret < 0)
1343 return ret;
1344
1345 if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
1346 return 0;
1347
1348 if (!tb[CTA_PROTO_NUM])
1349 return -EINVAL;
1350
1351 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1352
1353 rcu_read_lock();
1354 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1355
1356 if (likely(l4proto->nlattr_to_tuple)) {
1357 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1358 l4proto->nla_policy,
1359 NULL);
1360 if (ret == 0)
1361 ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
1362 }
1363
1364 rcu_read_unlock();
1365
1366 return ret;
1367}
1368
1369static int
1370ctnetlink_parse_zone(const struct nlattr *attr,
1371 struct nf_conntrack_zone *zone)
1372{
1373 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1374 NF_CT_DEFAULT_ZONE_DIR, 0);
1375#ifdef CONFIG_NF_CONNTRACK_ZONES
1376 if (attr)
1377 zone->id = ntohs(nla_get_be16(attr));
1378#else
1379 if (attr)
1380 return -EOPNOTSUPP;
1381#endif
1382 return 0;
1383}
1384
1385static int
1386ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1387 struct nf_conntrack_zone *zone)
1388{
1389 int ret;
1390
1391 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1392 return -EINVAL;
1393
1394 ret = ctnetlink_parse_zone(attr, zone);
1395 if (ret < 0)
1396 return ret;
1397
1398 if (type == CTA_TUPLE_REPLY)
1399 zone->dir = NF_CT_ZONE_DIR_REPL;
1400 else
1401 zone->dir = NF_CT_ZONE_DIR_ORIG;
1402
1403 return 0;
1404}
1405
1406static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1407 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1408 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1409 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1410};
1411
1412#define CTA_FILTER_F_ALL_CTA_PROTO \
1413 (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
1414 CTA_FILTER_F_CTA_PROTO_DST_PORT | \
1415 CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
1416 CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
1417 CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
1418 CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
1419 CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
1420 CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
1421
1422static int
1423ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
1424 struct nf_conntrack_tuple *tuple, u32 type,
1425 u_int8_t l3num, struct nf_conntrack_zone *zone,
1426 u_int32_t flags)
1427{
1428 struct nlattr *tb[CTA_TUPLE_MAX+1];
1429 int err;
1430
1431 memset(tuple, 0, sizeof(*tuple));
1432
1433 err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1434 tuple_nla_policy, NULL);
1435 if (err < 0)
1436 return err;
1437
1438 if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1439 return -EOPNOTSUPP;
1440 tuple->src.l3num = l3num;
1441
1442 if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
1443 flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1444 if (!tb[CTA_TUPLE_IP])
1445 return -EINVAL;
1446
1447 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
1448 if (err < 0)
1449 return err;
1450 }
1451
1452 if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
1453 if (!tb[CTA_TUPLE_PROTO])
1454 return -EINVAL;
1455
1456 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
1457 if (err < 0)
1458 return err;
1459 } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
1460
1461 return -EINVAL;
1462 }
1463
1464 if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
1465 if (!zone)
1466 return -EINVAL;
1467
1468 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1469 type, zone);
1470 if (err < 0)
1471 return err;
1472 }
1473
1474
1475 if (type == CTA_TUPLE_REPLY)
1476 tuple->dst.dir = IP_CT_DIR_REPLY;
1477 else
1478 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1479
1480 return 0;
1481}
1482
1483static int
1484ctnetlink_parse_tuple(const struct nlattr * const cda[],
1485 struct nf_conntrack_tuple *tuple, u32 type,
1486 u_int8_t l3num, struct nf_conntrack_zone *zone)
1487{
1488 return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
1489 CTA_FILTER_FLAG(ALL));
1490}
1491
1492static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1493 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1494 .len = NF_CT_HELPER_NAME_LEN - 1 },
1495};
1496
1497static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1498 struct nlattr **helpinfo)
1499{
1500 int err;
1501 struct nlattr *tb[CTA_HELP_MAX+1];
1502
1503 err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1504 help_nla_policy, NULL);
1505 if (err < 0)
1506 return err;
1507
1508 if (!tb[CTA_HELP_NAME])
1509 return -EINVAL;
1510
1511 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1512
1513 if (tb[CTA_HELP_INFO])
1514 *helpinfo = tb[CTA_HELP_INFO];
1515
1516 return 0;
1517}
1518
1519static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1520 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1521 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1522 [CTA_STATUS] = { .type = NLA_U32 },
1523 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1524 [CTA_HELP] = { .type = NLA_NESTED },
1525 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1526 [CTA_TIMEOUT] = { .type = NLA_U32 },
1527 [CTA_MARK] = { .type = NLA_U32 },
1528 [CTA_ID] = { .type = NLA_U32 },
1529 [CTA_NAT_DST] = { .type = NLA_NESTED },
1530 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1531 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1532 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1533 [CTA_ZONE] = { .type = NLA_U16 },
1534 [CTA_MARK_MASK] = { .type = NLA_U32 },
1535 [CTA_LABELS] = { .type = NLA_BINARY,
1536 .len = NF_CT_LABELS_MAX_SIZE },
1537 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1538 .len = NF_CT_LABELS_MAX_SIZE },
1539 [CTA_FILTER] = { .type = NLA_NESTED },
1540 [CTA_STATUS_MASK] = { .type = NLA_U32 },
1541};
1542
1543static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1544{
1545 if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1546 return 0;
1547
1548 return ctnetlink_filter_match(ct, data);
1549}
1550
1551static int ctnetlink_flush_conntrack(struct net *net,
1552 const struct nlattr * const cda[],
1553 u32 portid, int report, u8 family)
1554{
1555 struct ctnetlink_filter *filter = NULL;
1556
1557 if (ctnetlink_needs_filter(family, cda)) {
1558 if (cda[CTA_FILTER])
1559 return -EOPNOTSUPP;
1560
1561 filter = ctnetlink_alloc_filter(cda, family);
1562 if (IS_ERR(filter))
1563 return PTR_ERR(filter);
1564 }
1565
1566 nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
1567 portid, report);
1568 kfree(filter);
1569
1570 return 0;
1571}
1572
1573static int ctnetlink_del_conntrack(struct sk_buff *skb,
1574 const struct nfnl_info *info,
1575 const struct nlattr * const cda[])
1576{
1577 u8 family = info->nfmsg->nfgen_family;
1578 struct nf_conntrack_tuple_hash *h;
1579 struct nf_conntrack_tuple tuple;
1580 struct nf_conntrack_zone zone;
1581 struct nf_conn *ct;
1582 int err;
1583
1584 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1585 if (err < 0)
1586 return err;
1587
1588 if (cda[CTA_TUPLE_ORIG])
1589 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1590 family, &zone);
1591 else if (cda[CTA_TUPLE_REPLY])
1592 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1593 family, &zone);
1594 else {
1595 u_int8_t u3 = info->nfmsg->version ? family : AF_UNSPEC;
1596
1597 return ctnetlink_flush_conntrack(info->net, cda,
1598 NETLINK_CB(skb).portid,
1599 nlmsg_report(info->nlh), u3);
1600 }
1601
1602 if (err < 0)
1603 return err;
1604
1605 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1606 if (!h)
1607 return -ENOENT;
1608
1609 ct = nf_ct_tuplehash_to_ctrack(h);
1610
1611 if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1612 nf_ct_put(ct);
1613 return -EBUSY;
1614 }
1615
1616 if (cda[CTA_ID]) {
1617 __be32 id = nla_get_be32(cda[CTA_ID]);
1618
1619 if (id != (__force __be32)nf_ct_get_id(ct)) {
1620 nf_ct_put(ct);
1621 return -ENOENT;
1622 }
1623 }
1624
1625 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(info->nlh));
1626 nf_ct_put(ct);
1627
1628 return 0;
1629}
1630
1631static int ctnetlink_get_conntrack(struct sk_buff *skb,
1632 const struct nfnl_info *info,
1633 const struct nlattr * const cda[])
1634{
1635 u_int8_t u3 = info->nfmsg->nfgen_family;
1636 struct nf_conntrack_tuple_hash *h;
1637 struct nf_conntrack_tuple tuple;
1638 struct nf_conntrack_zone zone;
1639 struct sk_buff *skb2;
1640 struct nf_conn *ct;
1641 int err;
1642
1643 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1644 struct netlink_dump_control c = {
1645 .start = ctnetlink_start,
1646 .dump = ctnetlink_dump_table,
1647 .done = ctnetlink_done,
1648 .data = (void *)cda,
1649 };
1650
1651 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1652 }
1653
1654 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1655 if (err < 0)
1656 return err;
1657
1658 if (cda[CTA_TUPLE_ORIG])
1659 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1660 u3, &zone);
1661 else if (cda[CTA_TUPLE_REPLY])
1662 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1663 u3, &zone);
1664 else
1665 return -EINVAL;
1666
1667 if (err < 0)
1668 return err;
1669
1670 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1671 if (!h)
1672 return -ENOENT;
1673
1674 ct = nf_ct_tuplehash_to_ctrack(h);
1675
1676 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1677 if (!skb2) {
1678 nf_ct_put(ct);
1679 return -ENOMEM;
1680 }
1681
1682 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid,
1683 info->nlh->nlmsg_seq,
1684 NFNL_MSG_TYPE(info->nlh->nlmsg_type), ct,
1685 true, 0);
1686 nf_ct_put(ct);
1687 if (err <= 0) {
1688 kfree_skb(skb2);
1689 return -ENOMEM;
1690 }
1691
1692 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
1693}
1694
1695static int ctnetlink_done_list(struct netlink_callback *cb)
1696{
1697 if (cb->args[1])
1698 nf_ct_put((struct nf_conn *)cb->args[1]);
1699 return 0;
1700}
1701
1702static int
1703ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1704{
1705 struct nf_conn *ct, *last;
1706 struct nf_conntrack_tuple_hash *h;
1707 struct hlist_nulls_node *n;
1708 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1709 u_int8_t l3proto = nfmsg->nfgen_family;
1710 int res;
1711 int cpu;
1712 struct hlist_nulls_head *list;
1713 struct net *net = sock_net(skb->sk);
1714
1715 if (cb->args[2])
1716 return 0;
1717
1718 last = (struct nf_conn *)cb->args[1];
1719
1720 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1721 struct ct_pcpu *pcpu;
1722
1723 if (!cpu_possible(cpu))
1724 continue;
1725
1726 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1727 spin_lock_bh(&pcpu->lock);
1728 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1729restart:
1730 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1731 ct = nf_ct_tuplehash_to_ctrack(h);
1732 if (l3proto && nf_ct_l3num(ct) != l3proto)
1733 continue;
1734 if (cb->args[1]) {
1735 if (ct != last)
1736 continue;
1737 cb->args[1] = 0;
1738 }
1739
1740
1741
1742
1743
1744
1745
1746
1747 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1748 cb->nlh->nlmsg_seq,
1749 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1750 ct, dying, 0);
1751 if (res < 0) {
1752 if (!refcount_inc_not_zero(&ct->ct_general.use))
1753 continue;
1754 cb->args[0] = cpu;
1755 cb->args[1] = (unsigned long)ct;
1756 spin_unlock_bh(&pcpu->lock);
1757 goto out;
1758 }
1759 }
1760 if (cb->args[1]) {
1761 cb->args[1] = 0;
1762 goto restart;
1763 }
1764 spin_unlock_bh(&pcpu->lock);
1765 }
1766 cb->args[2] = 1;
1767out:
1768 if (last)
1769 nf_ct_put(last);
1770
1771 return skb->len;
1772}
1773
1774static int
1775ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1776{
1777 return ctnetlink_dump_list(skb, cb, true);
1778}
1779
1780static int ctnetlink_get_ct_dying(struct sk_buff *skb,
1781 const struct nfnl_info *info,
1782 const struct nlattr * const cda[])
1783{
1784 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1785 struct netlink_dump_control c = {
1786 .dump = ctnetlink_dump_dying,
1787 .done = ctnetlink_done_list,
1788 };
1789 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1790 }
1791
1792 return -EOPNOTSUPP;
1793}
1794
1795static int
1796ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1797{
1798 return ctnetlink_dump_list(skb, cb, false);
1799}
1800
1801static int ctnetlink_get_ct_unconfirmed(struct sk_buff *skb,
1802 const struct nfnl_info *info,
1803 const struct nlattr * const cda[])
1804{
1805 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1806 struct netlink_dump_control c = {
1807 .dump = ctnetlink_dump_unconfirmed,
1808 .done = ctnetlink_done_list,
1809 };
1810 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1811 }
1812
1813 return -EOPNOTSUPP;
1814}
1815
1816#if IS_ENABLED(CONFIG_NF_NAT)
1817static int
1818ctnetlink_parse_nat_setup(struct nf_conn *ct,
1819 enum nf_nat_manip_type manip,
1820 const struct nlattr *attr)
1821 __must_hold(RCU)
1822{
1823 const struct nf_nat_hook *nat_hook;
1824 int err;
1825
1826 nat_hook = rcu_dereference(nf_nat_hook);
1827 if (!nat_hook) {
1828#ifdef CONFIG_MODULES
1829 rcu_read_unlock();
1830 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1831 if (request_module("nf-nat") < 0) {
1832 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1833 rcu_read_lock();
1834 return -EOPNOTSUPP;
1835 }
1836 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1837 rcu_read_lock();
1838 nat_hook = rcu_dereference(nf_nat_hook);
1839 if (nat_hook)
1840 return -EAGAIN;
1841#endif
1842 return -EOPNOTSUPP;
1843 }
1844
1845 err = nat_hook->parse_nat_setup(ct, manip, attr);
1846 if (err == -EAGAIN) {
1847#ifdef CONFIG_MODULES
1848 rcu_read_unlock();
1849 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1850 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1851 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1852 rcu_read_lock();
1853 return -EOPNOTSUPP;
1854 }
1855 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1856 rcu_read_lock();
1857#else
1858 err = -EOPNOTSUPP;
1859#endif
1860 }
1861 return err;
1862}
1863#endif
1864
1865static void
1866__ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1867 unsigned long off)
1868{
1869 unsigned int bit;
1870
1871
1872 on &= ~IPS_UNCHANGEABLE_MASK;
1873 off &= ~IPS_UNCHANGEABLE_MASK;
1874
1875 for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1876 if (on & (1 << bit))
1877 set_bit(bit, &ct->status);
1878 else if (off & (1 << bit))
1879 clear_bit(bit, &ct->status);
1880 }
1881}
1882
1883static int
1884ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1885{
1886 unsigned long d;
1887 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1888 d = ct->status ^ status;
1889
1890 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1891
1892 return -EBUSY;
1893
1894 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1895
1896 return -EBUSY;
1897
1898 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1899
1900 return -EBUSY;
1901
1902 __ctnetlink_change_status(ct, status, 0);
1903 return 0;
1904}
1905
1906static int
1907ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1908{
1909#if IS_ENABLED(CONFIG_NF_NAT)
1910 int ret;
1911
1912 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1913 return 0;
1914
1915 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1916 cda[CTA_NAT_DST]);
1917 if (ret < 0)
1918 return ret;
1919
1920 return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1921 cda[CTA_NAT_SRC]);
1922#else
1923 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1924 return 0;
1925 return -EOPNOTSUPP;
1926#endif
1927}
1928
1929static int ctnetlink_change_helper(struct nf_conn *ct,
1930 const struct nlattr * const cda[])
1931{
1932 struct nf_conntrack_helper *helper;
1933 struct nf_conn_help *help = nfct_help(ct);
1934 char *helpname = NULL;
1935 struct nlattr *helpinfo = NULL;
1936 int err;
1937
1938 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1939 if (err < 0)
1940 return err;
1941
1942
1943 if (ct->master) {
1944
1945
1946
1947
1948 err = -EBUSY;
1949 if (help) {
1950 rcu_read_lock();
1951 helper = rcu_dereference(help->helper);
1952 if (helper && !strcmp(helper->name, helpname))
1953 err = 0;
1954 rcu_read_unlock();
1955 }
1956
1957 return err;
1958 }
1959
1960 if (!strcmp(helpname, "")) {
1961 if (help && help->helper) {
1962
1963 nf_ct_remove_expectations(ct);
1964 RCU_INIT_POINTER(help->helper, NULL);
1965 }
1966
1967 return 0;
1968 }
1969
1970 rcu_read_lock();
1971 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1972 nf_ct_protonum(ct));
1973 if (helper == NULL) {
1974 rcu_read_unlock();
1975 return -EOPNOTSUPP;
1976 }
1977
1978 if (help) {
1979 if (help->helper == helper) {
1980
1981 if (helper->from_nlattr)
1982 helper->from_nlattr(helpinfo, ct);
1983 err = 0;
1984 } else
1985 err = -EBUSY;
1986 } else {
1987
1988 err = -EOPNOTSUPP;
1989 }
1990
1991 rcu_read_unlock();
1992 return err;
1993}
1994
1995static int ctnetlink_change_timeout(struct nf_conn *ct,
1996 const struct nlattr * const cda[])
1997{
1998 u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1999
2000 if (timeout > INT_MAX)
2001 timeout = INT_MAX;
2002 WRITE_ONCE(ct->timeout, nfct_time_stamp + (u32)timeout);
2003
2004 if (test_bit(IPS_DYING_BIT, &ct->status))
2005 return -ETIME;
2006
2007 return 0;
2008}
2009
2010#if defined(CONFIG_NF_CONNTRACK_MARK)
2011static void ctnetlink_change_mark(struct nf_conn *ct,
2012 const struct nlattr * const cda[])
2013{
2014 u32 mark, newmark, mask = 0;
2015
2016 if (cda[CTA_MARK_MASK])
2017 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2018
2019 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2020 newmark = (ct->mark & mask) ^ mark;
2021 if (newmark != ct->mark)
2022 ct->mark = newmark;
2023}
2024#endif
2025
2026static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
2027 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
2028 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
2029 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
2030};
2031
2032static int ctnetlink_change_protoinfo(struct nf_conn *ct,
2033 const struct nlattr * const cda[])
2034{
2035 const struct nlattr *attr = cda[CTA_PROTOINFO];
2036 const struct nf_conntrack_l4proto *l4proto;
2037 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
2038 int err = 0;
2039
2040 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
2041 protoinfo_policy, NULL);
2042 if (err < 0)
2043 return err;
2044
2045 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
2046 if (l4proto->from_nlattr)
2047 err = l4proto->from_nlattr(tb, ct);
2048
2049 return err;
2050}
2051
2052static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
2053 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
2054 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
2055 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
2056};
2057
2058static int change_seq_adj(struct nf_ct_seqadj *seq,
2059 const struct nlattr * const attr)
2060{
2061 int err;
2062 struct nlattr *cda[CTA_SEQADJ_MAX+1];
2063
2064 err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
2065 seqadj_policy, NULL);
2066 if (err < 0)
2067 return err;
2068
2069 if (!cda[CTA_SEQADJ_CORRECTION_POS])
2070 return -EINVAL;
2071
2072 seq->correction_pos =
2073 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
2074
2075 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
2076 return -EINVAL;
2077
2078 seq->offset_before =
2079 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
2080
2081 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
2082 return -EINVAL;
2083
2084 seq->offset_after =
2085 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
2086
2087 return 0;
2088}
2089
2090static int
2091ctnetlink_change_seq_adj(struct nf_conn *ct,
2092 const struct nlattr * const cda[])
2093{
2094 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
2095 int ret = 0;
2096
2097 if (!seqadj)
2098 return 0;
2099
2100 spin_lock_bh(&ct->lock);
2101 if (cda[CTA_SEQ_ADJ_ORIG]) {
2102 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
2103 cda[CTA_SEQ_ADJ_ORIG]);
2104 if (ret < 0)
2105 goto err;
2106
2107 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2108 }
2109
2110 if (cda[CTA_SEQ_ADJ_REPLY]) {
2111 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
2112 cda[CTA_SEQ_ADJ_REPLY]);
2113 if (ret < 0)
2114 goto err;
2115
2116 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2117 }
2118
2119 spin_unlock_bh(&ct->lock);
2120 return 0;
2121err:
2122 spin_unlock_bh(&ct->lock);
2123 return ret;
2124}
2125
2126static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
2127 [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
2128 [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
2129 [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
2130};
2131
2132static int ctnetlink_change_synproxy(struct nf_conn *ct,
2133 const struct nlattr * const cda[])
2134{
2135 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
2136 struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
2137 int err;
2138
2139 if (!synproxy)
2140 return 0;
2141
2142 err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
2143 cda[CTA_SYNPROXY], synproxy_policy,
2144 NULL);
2145 if (err < 0)
2146 return err;
2147
2148 if (!tb[CTA_SYNPROXY_ISN] ||
2149 !tb[CTA_SYNPROXY_ITS] ||
2150 !tb[CTA_SYNPROXY_TSOFF])
2151 return -EINVAL;
2152
2153 synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
2154 synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
2155 synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
2156
2157 return 0;
2158}
2159
2160static int
2161ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
2162{
2163#ifdef CONFIG_NF_CONNTRACK_LABELS
2164 size_t len = nla_len(cda[CTA_LABELS]);
2165 const void *mask = cda[CTA_LABELS_MASK];
2166
2167 if (len & (sizeof(u32)-1))
2168 return -EINVAL;
2169
2170 if (mask) {
2171 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
2172 nla_len(cda[CTA_LABELS_MASK]) != len)
2173 return -EINVAL;
2174 mask = nla_data(cda[CTA_LABELS_MASK]);
2175 }
2176
2177 len /= sizeof(u32);
2178
2179 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
2180#else
2181 return -EOPNOTSUPP;
2182#endif
2183}
2184
2185static int
2186ctnetlink_change_conntrack(struct nf_conn *ct,
2187 const struct nlattr * const cda[])
2188{
2189 int err;
2190
2191
2192 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
2193 return -EOPNOTSUPP;
2194
2195 if (cda[CTA_HELP]) {
2196 err = ctnetlink_change_helper(ct, cda);
2197 if (err < 0)
2198 return err;
2199 }
2200
2201 if (cda[CTA_TIMEOUT]) {
2202 err = ctnetlink_change_timeout(ct, cda);
2203 if (err < 0)
2204 return err;
2205 }
2206
2207 if (cda[CTA_STATUS]) {
2208 err = ctnetlink_change_status(ct, cda);
2209 if (err < 0)
2210 return err;
2211 }
2212
2213 if (cda[CTA_PROTOINFO]) {
2214 err = ctnetlink_change_protoinfo(ct, cda);
2215 if (err < 0)
2216 return err;
2217 }
2218
2219#if defined(CONFIG_NF_CONNTRACK_MARK)
2220 if (cda[CTA_MARK])
2221 ctnetlink_change_mark(ct, cda);
2222#endif
2223
2224 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2225 err = ctnetlink_change_seq_adj(ct, cda);
2226 if (err < 0)
2227 return err;
2228 }
2229
2230 if (cda[CTA_SYNPROXY]) {
2231 err = ctnetlink_change_synproxy(ct, cda);
2232 if (err < 0)
2233 return err;
2234 }
2235
2236 if (cda[CTA_LABELS]) {
2237 err = ctnetlink_attach_labels(ct, cda);
2238 if (err < 0)
2239 return err;
2240 }
2241
2242 return 0;
2243}
2244
2245static struct nf_conn *
2246ctnetlink_create_conntrack(struct net *net,
2247 const struct nf_conntrack_zone *zone,
2248 const struct nlattr * const cda[],
2249 struct nf_conntrack_tuple *otuple,
2250 struct nf_conntrack_tuple *rtuple,
2251 u8 u3)
2252{
2253 struct nf_conn *ct;
2254 int err = -EINVAL;
2255 struct nf_conntrack_helper *helper;
2256 struct nf_conn_tstamp *tstamp;
2257 u64 timeout;
2258
2259 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
2260 if (IS_ERR(ct))
2261 return ERR_PTR(-ENOMEM);
2262
2263 if (!cda[CTA_TIMEOUT])
2264 goto err1;
2265
2266 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2267 if (timeout > INT_MAX)
2268 timeout = INT_MAX;
2269 ct->timeout = (u32)timeout + nfct_time_stamp;
2270
2271 rcu_read_lock();
2272 if (cda[CTA_HELP]) {
2273 char *helpname = NULL;
2274 struct nlattr *helpinfo = NULL;
2275
2276 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
2277 if (err < 0)
2278 goto err2;
2279
2280 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2281 nf_ct_protonum(ct));
2282 if (helper == NULL) {
2283 rcu_read_unlock();
2284#ifdef CONFIG_MODULES
2285 if (request_module("nfct-helper-%s", helpname) < 0) {
2286 err = -EOPNOTSUPP;
2287 goto err1;
2288 }
2289
2290 rcu_read_lock();
2291 helper = __nf_conntrack_helper_find(helpname,
2292 nf_ct_l3num(ct),
2293 nf_ct_protonum(ct));
2294 if (helper) {
2295 err = -EAGAIN;
2296 goto err2;
2297 }
2298 rcu_read_unlock();
2299#endif
2300 err = -EOPNOTSUPP;
2301 goto err1;
2302 } else {
2303 struct nf_conn_help *help;
2304
2305 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2306 if (help == NULL) {
2307 err = -ENOMEM;
2308 goto err2;
2309 }
2310
2311 if (helper->from_nlattr)
2312 helper->from_nlattr(helpinfo, ct);
2313
2314
2315 ct->status |= IPS_HELPER;
2316 RCU_INIT_POINTER(help->helper, helper);
2317 }
2318 } else {
2319
2320 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
2321 if (err < 0)
2322 goto err2;
2323 }
2324
2325 err = ctnetlink_setup_nat(ct, cda);
2326 if (err < 0)
2327 goto err2;
2328
2329 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2330 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2331 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2332 nf_ct_labels_ext_add(ct);
2333 nfct_seqadj_ext_add(ct);
2334 nfct_synproxy_ext_add(ct);
2335
2336
2337 ct->status |= IPS_CONFIRMED;
2338
2339 if (cda[CTA_STATUS]) {
2340 err = ctnetlink_change_status(ct, cda);
2341 if (err < 0)
2342 goto err2;
2343 }
2344
2345 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2346 err = ctnetlink_change_seq_adj(ct, cda);
2347 if (err < 0)
2348 goto err2;
2349 }
2350
2351 memset(&ct->proto, 0, sizeof(ct->proto));
2352 if (cda[CTA_PROTOINFO]) {
2353 err = ctnetlink_change_protoinfo(ct, cda);
2354 if (err < 0)
2355 goto err2;
2356 }
2357
2358 if (cda[CTA_SYNPROXY]) {
2359 err = ctnetlink_change_synproxy(ct, cda);
2360 if (err < 0)
2361 goto err2;
2362 }
2363
2364#if defined(CONFIG_NF_CONNTRACK_MARK)
2365 if (cda[CTA_MARK])
2366 ctnetlink_change_mark(ct, cda);
2367#endif
2368
2369
2370 if (cda[CTA_TUPLE_MASTER]) {
2371 struct nf_conntrack_tuple master;
2372 struct nf_conntrack_tuple_hash *master_h;
2373 struct nf_conn *master_ct;
2374
2375 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2376 u3, NULL);
2377 if (err < 0)
2378 goto err2;
2379
2380 master_h = nf_conntrack_find_get(net, zone, &master);
2381 if (master_h == NULL) {
2382 err = -ENOENT;
2383 goto err2;
2384 }
2385 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2386 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2387 ct->master = master_ct;
2388 }
2389 tstamp = nf_conn_tstamp_find(ct);
2390 if (tstamp)
2391 tstamp->start = ktime_get_real_ns();
2392
2393 err = nf_conntrack_hash_check_insert(ct);
2394 if (err < 0)
2395 goto err2;
2396
2397 rcu_read_unlock();
2398
2399 return ct;
2400
2401err2:
2402 rcu_read_unlock();
2403err1:
2404 nf_conntrack_free(ct);
2405 return ERR_PTR(err);
2406}
2407
2408static int ctnetlink_new_conntrack(struct sk_buff *skb,
2409 const struct nfnl_info *info,
2410 const struct nlattr * const cda[])
2411{
2412 struct nf_conntrack_tuple otuple, rtuple;
2413 struct nf_conntrack_tuple_hash *h = NULL;
2414 u_int8_t u3 = info->nfmsg->nfgen_family;
2415 struct nf_conntrack_zone zone;
2416 struct nf_conn *ct;
2417 int err;
2418
2419 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2420 if (err < 0)
2421 return err;
2422
2423 if (cda[CTA_TUPLE_ORIG]) {
2424 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2425 u3, &zone);
2426 if (err < 0)
2427 return err;
2428 }
2429
2430 if (cda[CTA_TUPLE_REPLY]) {
2431 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2432 u3, &zone);
2433 if (err < 0)
2434 return err;
2435 }
2436
2437 if (cda[CTA_TUPLE_ORIG])
2438 h = nf_conntrack_find_get(info->net, &zone, &otuple);
2439 else if (cda[CTA_TUPLE_REPLY])
2440 h = nf_conntrack_find_get(info->net, &zone, &rtuple);
2441
2442 if (h == NULL) {
2443 err = -ENOENT;
2444 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
2445 enum ip_conntrack_events events;
2446
2447 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2448 return -EINVAL;
2449 if (otuple.dst.protonum != rtuple.dst.protonum)
2450 return -EINVAL;
2451
2452 ct = ctnetlink_create_conntrack(info->net, &zone, cda,
2453 &otuple, &rtuple, u3);
2454 if (IS_ERR(ct))
2455 return PTR_ERR(ct);
2456
2457 err = 0;
2458 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2459 events = 1 << IPCT_RELATED;
2460 else
2461 events = 1 << IPCT_NEW;
2462
2463 if (cda[CTA_LABELS] &&
2464 ctnetlink_attach_labels(ct, cda) == 0)
2465 events |= (1 << IPCT_LABEL);
2466
2467 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2468 (1 << IPCT_ASSURED) |
2469 (1 << IPCT_HELPER) |
2470 (1 << IPCT_PROTOINFO) |
2471 (1 << IPCT_SEQADJ) |
2472 (1 << IPCT_MARK) |
2473 (1 << IPCT_SYNPROXY) |
2474 events,
2475 ct, NETLINK_CB(skb).portid,
2476 nlmsg_report(info->nlh));
2477 nf_ct_put(ct);
2478 }
2479
2480 return err;
2481 }
2482
2483
2484 err = -EEXIST;
2485 ct = nf_ct_tuplehash_to_ctrack(h);
2486 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL)) {
2487 err = ctnetlink_change_conntrack(ct, cda);
2488 if (err == 0) {
2489 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2490 (1 << IPCT_ASSURED) |
2491 (1 << IPCT_HELPER) |
2492 (1 << IPCT_LABEL) |
2493 (1 << IPCT_PROTOINFO) |
2494 (1 << IPCT_SEQADJ) |
2495 (1 << IPCT_MARK) |
2496 (1 << IPCT_SYNPROXY),
2497 ct, NETLINK_CB(skb).portid,
2498 nlmsg_report(info->nlh));
2499 }
2500 }
2501
2502 nf_ct_put(ct);
2503 return err;
2504}
2505
2506static int
2507ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2508 __u16 cpu, const struct ip_conntrack_stat *st)
2509{
2510 struct nlmsghdr *nlh;
2511 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2512
2513 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2514 IPCTNL_MSG_CT_GET_STATS_CPU);
2515 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2516 NFNETLINK_V0, htons(cpu));
2517 if (!nlh)
2518 goto nlmsg_failure;
2519
2520 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2521 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2522 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2523 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2524 htonl(st->insert_failed)) ||
2525 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2526 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2527 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2528 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2529 htonl(st->search_restart)) ||
2530 nla_put_be32(skb, CTA_STATS_CLASH_RESOLVE,
2531 htonl(st->clash_resolve)) ||
2532 nla_put_be32(skb, CTA_STATS_CHAIN_TOOLONG,
2533 htonl(st->chaintoolong)))
2534 goto nla_put_failure;
2535
2536 nlmsg_end(skb, nlh);
2537 return skb->len;
2538
2539nla_put_failure:
2540nlmsg_failure:
2541 nlmsg_cancel(skb, nlh);
2542 return -1;
2543}
2544
2545static int
2546ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2547{
2548 int cpu;
2549 struct net *net = sock_net(skb->sk);
2550
2551 if (cb->args[0] == nr_cpu_ids)
2552 return 0;
2553
2554 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2555 const struct ip_conntrack_stat *st;
2556
2557 if (!cpu_possible(cpu))
2558 continue;
2559
2560 st = per_cpu_ptr(net->ct.stat, cpu);
2561 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2562 NETLINK_CB(cb->skb).portid,
2563 cb->nlh->nlmsg_seq,
2564 cpu, st) < 0)
2565 break;
2566 }
2567 cb->args[0] = cpu;
2568
2569 return skb->len;
2570}
2571
2572static int ctnetlink_stat_ct_cpu(struct sk_buff *skb,
2573 const struct nfnl_info *info,
2574 const struct nlattr * const cda[])
2575{
2576 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
2577 struct netlink_dump_control c = {
2578 .dump = ctnetlink_ct_stat_cpu_dump,
2579 };
2580 return netlink_dump_start(info->sk, skb, info->nlh, &c);
2581 }
2582
2583 return 0;
2584}
2585
2586static int
2587ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2588 struct net *net)
2589{
2590 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2591 unsigned int nr_conntracks;
2592 struct nlmsghdr *nlh;
2593
2594 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2595 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2596 NFNETLINK_V0, 0);
2597 if (!nlh)
2598 goto nlmsg_failure;
2599
2600 nr_conntracks = nf_conntrack_count(net);
2601 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2602 goto nla_put_failure;
2603
2604 if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2605 goto nla_put_failure;
2606
2607 nlmsg_end(skb, nlh);
2608 return skb->len;
2609
2610nla_put_failure:
2611nlmsg_failure:
2612 nlmsg_cancel(skb, nlh);
2613 return -1;
2614}
2615
2616static int ctnetlink_stat_ct(struct sk_buff *skb, const struct nfnl_info *info,
2617 const struct nlattr * const cda[])
2618{
2619 struct sk_buff *skb2;
2620 int err;
2621
2622 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2623 if (skb2 == NULL)
2624 return -ENOMEM;
2625
2626 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2627 info->nlh->nlmsg_seq,
2628 NFNL_MSG_TYPE(info->nlh->nlmsg_type),
2629 sock_net(skb->sk));
2630 if (err <= 0) {
2631 kfree_skb(skb2);
2632 return -ENOMEM;
2633 }
2634
2635 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
2636}
2637
2638static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2639 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2640 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2641 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2642 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2643 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2644 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2645 .len = NF_CT_HELPER_NAME_LEN - 1 },
2646 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2647 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2648 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2649 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2650 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2651};
2652
2653static struct nf_conntrack_expect *
2654ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2655 struct nf_conntrack_helper *helper,
2656 struct nf_conntrack_tuple *tuple,
2657 struct nf_conntrack_tuple *mask);
2658
2659#ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2660static size_t
2661ctnetlink_glue_build_size(const struct nf_conn *ct)
2662{
2663 return 3 * nla_total_size(0)
2664 + 3 * nla_total_size(0)
2665 + 3 * nla_total_size(0)
2666 + 3 * nla_total_size(sizeof(u_int8_t))
2667 + nla_total_size(sizeof(u_int32_t))
2668 + nla_total_size(sizeof(u_int32_t))
2669 + nla_total_size(sizeof(u_int32_t))
2670 + nla_total_size(0)
2671 + nla_total_size(0)
2672 + nla_total_size(NF_CT_HELPER_NAME_LEN)
2673 + ctnetlink_secctx_size(ct)
2674 + ctnetlink_acct_size(ct)
2675 + ctnetlink_timestamp_size(ct)
2676#if IS_ENABLED(CONFIG_NF_NAT)
2677 + 2 * nla_total_size(0)
2678 + 6 * nla_total_size(sizeof(u_int32_t))
2679#endif
2680#ifdef CONFIG_NF_CONNTRACK_MARK
2681 + nla_total_size(sizeof(u_int32_t))
2682#endif
2683#ifdef CONFIG_NF_CONNTRACK_ZONES
2684 + nla_total_size(sizeof(u_int16_t))
2685#endif
2686 + ctnetlink_proto_size(ct)
2687 ;
2688}
2689
2690static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2691{
2692 const struct nf_conntrack_zone *zone;
2693 struct nlattr *nest_parms;
2694
2695 zone = nf_ct_zone(ct);
2696
2697 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2698 if (!nest_parms)
2699 goto nla_put_failure;
2700 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2701 goto nla_put_failure;
2702 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2703 NF_CT_ZONE_DIR_ORIG) < 0)
2704 goto nla_put_failure;
2705 nla_nest_end(skb, nest_parms);
2706
2707 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2708 if (!nest_parms)
2709 goto nla_put_failure;
2710 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2711 goto nla_put_failure;
2712 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2713 NF_CT_ZONE_DIR_REPL) < 0)
2714 goto nla_put_failure;
2715 nla_nest_end(skb, nest_parms);
2716
2717 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2718 NF_CT_DEFAULT_ZONE_DIR) < 0)
2719 goto nla_put_failure;
2720
2721 if (ctnetlink_dump_id(skb, ct) < 0)
2722 goto nla_put_failure;
2723
2724 if (ctnetlink_dump_status(skb, ct) < 0)
2725 goto nla_put_failure;
2726
2727 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
2728 goto nla_put_failure;
2729
2730 if (ctnetlink_dump_protoinfo(skb, ct, false) < 0)
2731 goto nla_put_failure;
2732
2733 if (ctnetlink_dump_acct(skb, ct, IPCTNL_MSG_CT_GET) < 0 ||
2734 ctnetlink_dump_timestamp(skb, ct) < 0)
2735 goto nla_put_failure;
2736
2737 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2738 goto nla_put_failure;
2739
2740#ifdef CONFIG_NF_CONNTRACK_SECMARK
2741 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2742 goto nla_put_failure;
2743#endif
2744 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2745 goto nla_put_failure;
2746
2747 if ((ct->status & IPS_SEQ_ADJUST) &&
2748 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2749 goto nla_put_failure;
2750
2751 if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2752 goto nla_put_failure;
2753
2754#ifdef CONFIG_NF_CONNTRACK_MARK
2755 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2756 goto nla_put_failure;
2757#endif
2758 if (ctnetlink_dump_labels(skb, ct) < 0)
2759 goto nla_put_failure;
2760 return 0;
2761
2762nla_put_failure:
2763 return -ENOSPC;
2764}
2765
2766static int
2767ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2768 enum ip_conntrack_info ctinfo,
2769 u_int16_t ct_attr, u_int16_t ct_info_attr)
2770{
2771 struct nlattr *nest_parms;
2772
2773 nest_parms = nla_nest_start(skb, ct_attr);
2774 if (!nest_parms)
2775 goto nla_put_failure;
2776
2777 if (__ctnetlink_glue_build(skb, ct) < 0)
2778 goto nla_put_failure;
2779
2780 nla_nest_end(skb, nest_parms);
2781
2782 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2783 goto nla_put_failure;
2784
2785 return 0;
2786
2787nla_put_failure:
2788 return -ENOSPC;
2789}
2790
2791static int
2792ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2793{
2794 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2795 unsigned long d = ct->status ^ status;
2796
2797 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2798
2799 return -EBUSY;
2800
2801 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2802
2803 return -EBUSY;
2804
2805
2806
2807
2808
2809
2810
2811 __ctnetlink_change_status(ct, status, ~status);
2812 return 0;
2813}
2814
2815static int
2816ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2817{
2818 int err;
2819
2820 if (cda[CTA_TIMEOUT]) {
2821 err = ctnetlink_change_timeout(ct, cda);
2822 if (err < 0)
2823 return err;
2824 }
2825 if (cda[CTA_STATUS]) {
2826 err = ctnetlink_update_status(ct, cda);
2827 if (err < 0)
2828 return err;
2829 }
2830 if (cda[CTA_HELP]) {
2831 err = ctnetlink_change_helper(ct, cda);
2832 if (err < 0)
2833 return err;
2834 }
2835 if (cda[CTA_LABELS]) {
2836 err = ctnetlink_attach_labels(ct, cda);
2837 if (err < 0)
2838 return err;
2839 }
2840#if defined(CONFIG_NF_CONNTRACK_MARK)
2841 if (cda[CTA_MARK]) {
2842 ctnetlink_change_mark(ct, cda);
2843 }
2844#endif
2845 return 0;
2846}
2847
2848static int
2849ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2850{
2851 struct nlattr *cda[CTA_MAX+1];
2852 int ret;
2853
2854 ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2855 NULL);
2856 if (ret < 0)
2857 return ret;
2858
2859 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2860}
2861
2862static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2863 const struct nf_conn *ct,
2864 struct nf_conntrack_tuple *tuple,
2865 struct nf_conntrack_tuple *mask)
2866{
2867 int err;
2868
2869 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2870 nf_ct_l3num(ct), NULL);
2871 if (err < 0)
2872 return err;
2873
2874 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2875 nf_ct_l3num(ct), NULL);
2876}
2877
2878static int
2879ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2880 u32 portid, u32 report)
2881{
2882 struct nlattr *cda[CTA_EXPECT_MAX+1];
2883 struct nf_conntrack_tuple tuple, mask;
2884 struct nf_conntrack_helper *helper = NULL;
2885 struct nf_conntrack_expect *exp;
2886 int err;
2887
2888 err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2889 exp_nla_policy, NULL);
2890 if (err < 0)
2891 return err;
2892
2893 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2894 ct, &tuple, &mask);
2895 if (err < 0)
2896 return err;
2897
2898 if (cda[CTA_EXPECT_HELP_NAME]) {
2899 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2900
2901 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2902 nf_ct_protonum(ct));
2903 if (helper == NULL)
2904 return -EOPNOTSUPP;
2905 }
2906
2907 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2908 helper, &tuple, &mask);
2909 if (IS_ERR(exp))
2910 return PTR_ERR(exp);
2911
2912 err = nf_ct_expect_related_report(exp, portid, report, 0);
2913 nf_ct_expect_put(exp);
2914 return err;
2915}
2916
2917static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2918 enum ip_conntrack_info ctinfo, int diff)
2919{
2920 if (!(ct->status & IPS_NAT_MASK))
2921 return;
2922
2923 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2924}
2925
2926static const struct nfnl_ct_hook ctnetlink_glue_hook = {
2927 .build_size = ctnetlink_glue_build_size,
2928 .build = ctnetlink_glue_build,
2929 .parse = ctnetlink_glue_parse,
2930 .attach_expect = ctnetlink_glue_attach_expect,
2931 .seq_adjust = ctnetlink_glue_seqadj,
2932};
2933#endif
2934
2935
2936
2937
2938
2939static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2940 const struct nf_conntrack_tuple *tuple,
2941 u32 type)
2942{
2943 struct nlattr *nest_parms;
2944
2945 nest_parms = nla_nest_start(skb, type);
2946 if (!nest_parms)
2947 goto nla_put_failure;
2948 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2949 goto nla_put_failure;
2950 nla_nest_end(skb, nest_parms);
2951
2952 return 0;
2953
2954nla_put_failure:
2955 return -1;
2956}
2957
2958static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2959 const struct nf_conntrack_tuple *tuple,
2960 const struct nf_conntrack_tuple_mask *mask)
2961{
2962 const struct nf_conntrack_l4proto *l4proto;
2963 struct nf_conntrack_tuple m;
2964 struct nlattr *nest_parms;
2965 int ret;
2966
2967 memset(&m, 0xFF, sizeof(m));
2968 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2969 m.src.u.all = mask->src.u.all;
2970 m.src.l3num = tuple->src.l3num;
2971 m.dst.protonum = tuple->dst.protonum;
2972
2973 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2974 if (!nest_parms)
2975 goto nla_put_failure;
2976
2977 rcu_read_lock();
2978 ret = ctnetlink_dump_tuples_ip(skb, &m);
2979 if (ret >= 0) {
2980 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2981 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2982 }
2983 rcu_read_unlock();
2984
2985 if (unlikely(ret < 0))
2986 goto nla_put_failure;
2987
2988 nla_nest_end(skb, nest_parms);
2989
2990 return 0;
2991
2992nla_put_failure:
2993 return -1;
2994}
2995
2996static const union nf_inet_addr any_addr;
2997
2998static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2999{
3000 static siphash_aligned_key_t exp_id_seed;
3001 unsigned long a, b, c, d;
3002
3003 net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
3004
3005 a = (unsigned long)exp;
3006 b = (unsigned long)exp->helper;
3007 c = (unsigned long)exp->master;
3008 d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
3009
3010#ifdef CONFIG_64BIT
3011 return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
3012#else
3013 return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
3014#endif
3015}
3016
3017static int
3018ctnetlink_exp_dump_expect(struct sk_buff *skb,
3019 const struct nf_conntrack_expect *exp)
3020{
3021 struct nf_conn *master = exp->master;
3022 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
3023 struct nf_conn_help *help;
3024#if IS_ENABLED(CONFIG_NF_NAT)
3025 struct nlattr *nest_parms;
3026 struct nf_conntrack_tuple nat_tuple = {};
3027#endif
3028 struct nf_ct_helper_expectfn *expfn;
3029
3030 if (timeout < 0)
3031 timeout = 0;
3032
3033 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
3034 goto nla_put_failure;
3035 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
3036 goto nla_put_failure;
3037 if (ctnetlink_exp_dump_tuple(skb,
3038 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
3039 CTA_EXPECT_MASTER) < 0)
3040 goto nla_put_failure;
3041
3042#if IS_ENABLED(CONFIG_NF_NAT)
3043 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
3044 exp->saved_proto.all) {
3045 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
3046 if (!nest_parms)
3047 goto nla_put_failure;
3048
3049 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
3050 goto nla_put_failure;
3051
3052 nat_tuple.src.l3num = nf_ct_l3num(master);
3053 nat_tuple.src.u3 = exp->saved_addr;
3054 nat_tuple.dst.protonum = nf_ct_protonum(master);
3055 nat_tuple.src.u = exp->saved_proto;
3056
3057 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
3058 CTA_EXPECT_NAT_TUPLE) < 0)
3059 goto nla_put_failure;
3060 nla_nest_end(skb, nest_parms);
3061 }
3062#endif
3063 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
3064 nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
3065 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
3066 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
3067 goto nla_put_failure;
3068 help = nfct_help(master);
3069 if (help) {
3070 struct nf_conntrack_helper *helper;
3071
3072 helper = rcu_dereference(help->helper);
3073 if (helper &&
3074 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
3075 goto nla_put_failure;
3076 }
3077 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
3078 if (expfn != NULL &&
3079 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
3080 goto nla_put_failure;
3081
3082 return 0;
3083
3084nla_put_failure:
3085 return -1;
3086}
3087
3088static int
3089ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
3090 int event, const struct nf_conntrack_expect *exp)
3091{
3092 struct nlmsghdr *nlh;
3093 unsigned int flags = portid ? NLM_F_MULTI : 0;
3094
3095 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
3096 nlh = nfnl_msg_put(skb, portid, seq, event, flags,
3097 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3098 if (!nlh)
3099 goto nlmsg_failure;
3100
3101 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3102 goto nla_put_failure;
3103
3104 nlmsg_end(skb, nlh);
3105 return skb->len;
3106
3107nlmsg_failure:
3108nla_put_failure:
3109 nlmsg_cancel(skb, nlh);
3110 return -1;
3111}
3112
3113#ifdef CONFIG_NF_CONNTRACK_EVENTS
3114static int
3115ctnetlink_expect_event(unsigned int events, const struct nf_exp_event *item)
3116{
3117 struct nf_conntrack_expect *exp = item->exp;
3118 struct net *net = nf_ct_exp_net(exp);
3119 struct nlmsghdr *nlh;
3120 struct sk_buff *skb;
3121 unsigned int type, group;
3122 int flags = 0;
3123
3124 if (events & (1 << IPEXP_DESTROY)) {
3125 type = IPCTNL_MSG_EXP_DELETE;
3126 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
3127 } else if (events & (1 << IPEXP_NEW)) {
3128 type = IPCTNL_MSG_EXP_NEW;
3129 flags = NLM_F_CREATE|NLM_F_EXCL;
3130 group = NFNLGRP_CONNTRACK_EXP_NEW;
3131 } else
3132 return 0;
3133
3134 if (!item->report && !nfnetlink_has_listeners(net, group))
3135 return 0;
3136
3137 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
3138 if (skb == NULL)
3139 goto errout;
3140
3141 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
3142 nlh = nfnl_msg_put(skb, item->portid, 0, type, flags,
3143 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3144 if (!nlh)
3145 goto nlmsg_failure;
3146
3147 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3148 goto nla_put_failure;
3149
3150 nlmsg_end(skb, nlh);
3151 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
3152 return 0;
3153
3154nla_put_failure:
3155 nlmsg_cancel(skb, nlh);
3156nlmsg_failure:
3157 kfree_skb(skb);
3158errout:
3159 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
3160 return 0;
3161}
3162#endif
3163static int ctnetlink_exp_done(struct netlink_callback *cb)
3164{
3165 if (cb->args[1])
3166 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
3167 return 0;
3168}
3169
3170static int
3171ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3172{
3173 struct net *net = sock_net(skb->sk);
3174 struct nf_conntrack_expect *exp, *last;
3175 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3176 u_int8_t l3proto = nfmsg->nfgen_family;
3177
3178 rcu_read_lock();
3179 last = (struct nf_conntrack_expect *)cb->args[1];
3180 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
3181restart:
3182 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
3183 hnode) {
3184 if (l3proto && exp->tuple.src.l3num != l3proto)
3185 continue;
3186
3187 if (!net_eq(nf_ct_net(exp->master), net))
3188 continue;
3189
3190 if (cb->args[1]) {
3191 if (exp != last)
3192 continue;
3193 cb->args[1] = 0;
3194 }
3195 if (ctnetlink_exp_fill_info(skb,
3196 NETLINK_CB(cb->skb).portid,
3197 cb->nlh->nlmsg_seq,
3198 IPCTNL_MSG_EXP_NEW,
3199 exp) < 0) {
3200 if (!refcount_inc_not_zero(&exp->use))
3201 continue;
3202 cb->args[1] = (unsigned long)exp;
3203 goto out;
3204 }
3205 }
3206 if (cb->args[1]) {
3207 cb->args[1] = 0;
3208 goto restart;
3209 }
3210 }
3211out:
3212 rcu_read_unlock();
3213 if (last)
3214 nf_ct_expect_put(last);
3215
3216 return skb->len;
3217}
3218
3219static int
3220ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3221{
3222 struct nf_conntrack_expect *exp, *last;
3223 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3224 struct nf_conn *ct = cb->data;
3225 struct nf_conn_help *help = nfct_help(ct);
3226 u_int8_t l3proto = nfmsg->nfgen_family;
3227
3228 if (cb->args[0])
3229 return 0;
3230
3231 rcu_read_lock();
3232 last = (struct nf_conntrack_expect *)cb->args[1];
3233restart:
3234 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
3235 if (l3proto && exp->tuple.src.l3num != l3proto)
3236 continue;
3237 if (cb->args[1]) {
3238 if (exp != last)
3239 continue;
3240 cb->args[1] = 0;
3241 }
3242 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
3243 cb->nlh->nlmsg_seq,
3244 IPCTNL_MSG_EXP_NEW,
3245 exp) < 0) {
3246 if (!refcount_inc_not_zero(&exp->use))
3247 continue;
3248 cb->args[1] = (unsigned long)exp;
3249 goto out;
3250 }
3251 }
3252 if (cb->args[1]) {
3253 cb->args[1] = 0;
3254 goto restart;
3255 }
3256 cb->args[0] = 1;
3257out:
3258 rcu_read_unlock();
3259 if (last)
3260 nf_ct_expect_put(last);
3261
3262 return skb->len;
3263}
3264
3265static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
3266 struct sk_buff *skb,
3267 const struct nlmsghdr *nlh,
3268 const struct nlattr * const cda[],
3269 struct netlink_ext_ack *extack)
3270{
3271 int err;
3272 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3273 u_int8_t u3 = nfmsg->nfgen_family;
3274 struct nf_conntrack_tuple tuple;
3275 struct nf_conntrack_tuple_hash *h;
3276 struct nf_conn *ct;
3277 struct nf_conntrack_zone zone;
3278 struct netlink_dump_control c = {
3279 .dump = ctnetlink_exp_ct_dump_table,
3280 .done = ctnetlink_exp_done,
3281 };
3282
3283 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3284 u3, NULL);
3285 if (err < 0)
3286 return err;
3287
3288 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3289 if (err < 0)
3290 return err;
3291
3292 h = nf_conntrack_find_get(net, &zone, &tuple);
3293 if (!h)
3294 return -ENOENT;
3295
3296 ct = nf_ct_tuplehash_to_ctrack(h);
3297
3298 if (!nfct_help(ct)) {
3299 nf_ct_put(ct);
3300 return 0;
3301 }
3302
3303 c.data = ct;
3304
3305 err = netlink_dump_start(ctnl, skb, nlh, &c);
3306 nf_ct_put(ct);
3307
3308 return err;
3309}
3310
3311static int ctnetlink_get_expect(struct sk_buff *skb,
3312 const struct nfnl_info *info,
3313 const struct nlattr * const cda[])
3314{
3315 u_int8_t u3 = info->nfmsg->nfgen_family;
3316 struct nf_conntrack_tuple tuple;
3317 struct nf_conntrack_expect *exp;
3318 struct nf_conntrack_zone zone;
3319 struct sk_buff *skb2;
3320 int err;
3321
3322 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3323 if (cda[CTA_EXPECT_MASTER])
3324 return ctnetlink_dump_exp_ct(info->net, info->sk, skb,
3325 info->nlh, cda,
3326 info->extack);
3327 else {
3328 struct netlink_dump_control c = {
3329 .dump = ctnetlink_exp_dump_table,
3330 .done = ctnetlink_exp_done,
3331 };
3332 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3333 }
3334 }
3335
3336 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3337 if (err < 0)
3338 return err;
3339
3340 if (cda[CTA_EXPECT_TUPLE])
3341 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3342 u3, NULL);
3343 else if (cda[CTA_EXPECT_MASTER])
3344 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3345 u3, NULL);
3346 else
3347 return -EINVAL;
3348
3349 if (err < 0)
3350 return err;
3351
3352 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3353 if (!exp)
3354 return -ENOENT;
3355
3356 if (cda[CTA_EXPECT_ID]) {
3357 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3358
3359 if (id != nf_expect_get_id(exp)) {
3360 nf_ct_expect_put(exp);
3361 return -ENOENT;
3362 }
3363 }
3364
3365 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3366 if (!skb2) {
3367 nf_ct_expect_put(exp);
3368 return -ENOMEM;
3369 }
3370
3371 rcu_read_lock();
3372 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3373 info->nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
3374 exp);
3375 rcu_read_unlock();
3376 nf_ct_expect_put(exp);
3377 if (err <= 0) {
3378 kfree_skb(skb2);
3379 return -ENOMEM;
3380 }
3381
3382 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
3383}
3384
3385static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3386{
3387 const struct nf_conn_help *m_help;
3388 const char *name = data;
3389
3390 m_help = nfct_help(exp->master);
3391
3392 return strcmp(m_help->helper->name, name) == 0;
3393}
3394
3395static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3396{
3397 return true;
3398}
3399
3400static int ctnetlink_del_expect(struct sk_buff *skb,
3401 const struct nfnl_info *info,
3402 const struct nlattr * const cda[])
3403{
3404 u_int8_t u3 = info->nfmsg->nfgen_family;
3405 struct nf_conntrack_expect *exp;
3406 struct nf_conntrack_tuple tuple;
3407 struct nf_conntrack_zone zone;
3408 int err;
3409
3410 if (cda[CTA_EXPECT_TUPLE]) {
3411
3412 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3413 if (err < 0)
3414 return err;
3415
3416 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3417 u3, NULL);
3418 if (err < 0)
3419 return err;
3420
3421
3422 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3423 if (!exp)
3424 return -ENOENT;
3425
3426 if (cda[CTA_EXPECT_ID]) {
3427 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3428 if (ntohl(id) != (u32)(unsigned long)exp) {
3429 nf_ct_expect_put(exp);
3430 return -ENOENT;
3431 }
3432 }
3433
3434
3435 spin_lock_bh(&nf_conntrack_expect_lock);
3436 if (del_timer(&exp->timeout)) {
3437 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3438 nlmsg_report(info->nlh));
3439 nf_ct_expect_put(exp);
3440 }
3441 spin_unlock_bh(&nf_conntrack_expect_lock);
3442
3443
3444 nf_ct_expect_put(exp);
3445 } else if (cda[CTA_EXPECT_HELP_NAME]) {
3446 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3447
3448 nf_ct_expect_iterate_net(info->net, expect_iter_name, name,
3449 NETLINK_CB(skb).portid,
3450 nlmsg_report(info->nlh));
3451 } else {
3452
3453 nf_ct_expect_iterate_net(info->net, expect_iter_all, NULL,
3454 NETLINK_CB(skb).portid,
3455 nlmsg_report(info->nlh));
3456 }
3457
3458 return 0;
3459}
3460static int
3461ctnetlink_change_expect(struct nf_conntrack_expect *x,
3462 const struct nlattr * const cda[])
3463{
3464 if (cda[CTA_EXPECT_TIMEOUT]) {
3465 if (!del_timer(&x->timeout))
3466 return -ETIME;
3467
3468 x->timeout.expires = jiffies +
3469 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3470 add_timer(&x->timeout);
3471 }
3472 return 0;
3473}
3474
3475static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3476 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3477 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3478};
3479
3480static int
3481ctnetlink_parse_expect_nat(const struct nlattr *attr,
3482 struct nf_conntrack_expect *exp,
3483 u_int8_t u3)
3484{
3485#if IS_ENABLED(CONFIG_NF_NAT)
3486 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3487 struct nf_conntrack_tuple nat_tuple = {};
3488 int err;
3489
3490 err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3491 exp_nat_nla_policy, NULL);
3492 if (err < 0)
3493 return err;
3494
3495 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3496 return -EINVAL;
3497
3498 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3499 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3500 u3, NULL);
3501 if (err < 0)
3502 return err;
3503
3504 exp->saved_addr = nat_tuple.src.u3;
3505 exp->saved_proto = nat_tuple.src.u;
3506 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3507
3508 return 0;
3509#else
3510 return -EOPNOTSUPP;
3511#endif
3512}
3513
3514static struct nf_conntrack_expect *
3515ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3516 struct nf_conntrack_helper *helper,
3517 struct nf_conntrack_tuple *tuple,
3518 struct nf_conntrack_tuple *mask)
3519{
3520 u_int32_t class = 0;
3521 struct nf_conntrack_expect *exp;
3522 struct nf_conn_help *help;
3523 int err;
3524
3525 help = nfct_help(ct);
3526 if (!help)
3527 return ERR_PTR(-EOPNOTSUPP);
3528
3529 if (cda[CTA_EXPECT_CLASS] && helper) {
3530 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3531 if (class > helper->expect_class_max)
3532 return ERR_PTR(-EINVAL);
3533 }
3534 exp = nf_ct_expect_alloc(ct);
3535 if (!exp)
3536 return ERR_PTR(-ENOMEM);
3537
3538 if (cda[CTA_EXPECT_FLAGS]) {
3539 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3540 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3541 } else {
3542 exp->flags = 0;
3543 }
3544 if (cda[CTA_EXPECT_FN]) {
3545 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3546 struct nf_ct_helper_expectfn *expfn;
3547
3548 expfn = nf_ct_helper_expectfn_find_by_name(name);
3549 if (expfn == NULL) {
3550 err = -EINVAL;
3551 goto err_out;
3552 }
3553 exp->expectfn = expfn->expectfn;
3554 } else
3555 exp->expectfn = NULL;
3556
3557 exp->class = class;
3558 exp->master = ct;
3559 exp->helper = helper;
3560 exp->tuple = *tuple;
3561 exp->mask.src.u3 = mask->src.u3;
3562 exp->mask.src.u.all = mask->src.u.all;
3563
3564 if (cda[CTA_EXPECT_NAT]) {
3565 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3566 exp, nf_ct_l3num(ct));
3567 if (err < 0)
3568 goto err_out;
3569 }
3570 return exp;
3571err_out:
3572 nf_ct_expect_put(exp);
3573 return ERR_PTR(err);
3574}
3575
3576static int
3577ctnetlink_create_expect(struct net *net,
3578 const struct nf_conntrack_zone *zone,
3579 const struct nlattr * const cda[],
3580 u_int8_t u3, u32 portid, int report)
3581{
3582 struct nf_conntrack_tuple tuple, mask, master_tuple;
3583 struct nf_conntrack_tuple_hash *h = NULL;
3584 struct nf_conntrack_helper *helper = NULL;
3585 struct nf_conntrack_expect *exp;
3586 struct nf_conn *ct;
3587 int err;
3588
3589
3590 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3591 u3, NULL);
3592 if (err < 0)
3593 return err;
3594 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3595 u3, NULL);
3596 if (err < 0)
3597 return err;
3598 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3599 u3, NULL);
3600 if (err < 0)
3601 return err;
3602
3603
3604 h = nf_conntrack_find_get(net, zone, &master_tuple);
3605 if (!h)
3606 return -ENOENT;
3607 ct = nf_ct_tuplehash_to_ctrack(h);
3608
3609 rcu_read_lock();
3610 if (cda[CTA_EXPECT_HELP_NAME]) {
3611 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3612
3613 helper = __nf_conntrack_helper_find(helpname, u3,
3614 nf_ct_protonum(ct));
3615 if (helper == NULL) {
3616 rcu_read_unlock();
3617#ifdef CONFIG_MODULES
3618 if (request_module("nfct-helper-%s", helpname) < 0) {
3619 err = -EOPNOTSUPP;
3620 goto err_ct;
3621 }
3622 rcu_read_lock();
3623 helper = __nf_conntrack_helper_find(helpname, u3,
3624 nf_ct_protonum(ct));
3625 if (helper) {
3626 err = -EAGAIN;
3627 goto err_rcu;
3628 }
3629 rcu_read_unlock();
3630#endif
3631 err = -EOPNOTSUPP;
3632 goto err_ct;
3633 }
3634 }
3635
3636 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3637 if (IS_ERR(exp)) {
3638 err = PTR_ERR(exp);
3639 goto err_rcu;
3640 }
3641
3642 err = nf_ct_expect_related_report(exp, portid, report, 0);
3643 nf_ct_expect_put(exp);
3644err_rcu:
3645 rcu_read_unlock();
3646err_ct:
3647 nf_ct_put(ct);
3648 return err;
3649}
3650
3651static int ctnetlink_new_expect(struct sk_buff *skb,
3652 const struct nfnl_info *info,
3653 const struct nlattr * const cda[])
3654{
3655 u_int8_t u3 = info->nfmsg->nfgen_family;
3656 struct nf_conntrack_tuple tuple;
3657 struct nf_conntrack_expect *exp;
3658 struct nf_conntrack_zone zone;
3659 int err;
3660
3661 if (!cda[CTA_EXPECT_TUPLE]
3662 || !cda[CTA_EXPECT_MASK]
3663 || !cda[CTA_EXPECT_MASTER])
3664 return -EINVAL;
3665
3666 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3667 if (err < 0)
3668 return err;
3669
3670 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3671 u3, NULL);
3672 if (err < 0)
3673 return err;
3674
3675 spin_lock_bh(&nf_conntrack_expect_lock);
3676 exp = __nf_ct_expect_find(info->net, &zone, &tuple);
3677 if (!exp) {
3678 spin_unlock_bh(&nf_conntrack_expect_lock);
3679 err = -ENOENT;
3680 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
3681 err = ctnetlink_create_expect(info->net, &zone, cda, u3,
3682 NETLINK_CB(skb).portid,
3683 nlmsg_report(info->nlh));
3684 }
3685 return err;
3686 }
3687
3688 err = -EEXIST;
3689 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL))
3690 err = ctnetlink_change_expect(exp, cda);
3691 spin_unlock_bh(&nf_conntrack_expect_lock);
3692
3693 return err;
3694}
3695
3696static int
3697ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3698 const struct ip_conntrack_stat *st)
3699{
3700 struct nlmsghdr *nlh;
3701 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3702
3703 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3704 IPCTNL_MSG_EXP_GET_STATS_CPU);
3705 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
3706 NFNETLINK_V0, htons(cpu));
3707 if (!nlh)
3708 goto nlmsg_failure;
3709
3710 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3711 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3712 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3713 goto nla_put_failure;
3714
3715 nlmsg_end(skb, nlh);
3716 return skb->len;
3717
3718nla_put_failure:
3719nlmsg_failure:
3720 nlmsg_cancel(skb, nlh);
3721 return -1;
3722}
3723
3724static int
3725ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3726{
3727 int cpu;
3728 struct net *net = sock_net(skb->sk);
3729
3730 if (cb->args[0] == nr_cpu_ids)
3731 return 0;
3732
3733 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3734 const struct ip_conntrack_stat *st;
3735
3736 if (!cpu_possible(cpu))
3737 continue;
3738
3739 st = per_cpu_ptr(net->ct.stat, cpu);
3740 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3741 cb->nlh->nlmsg_seq,
3742 cpu, st) < 0)
3743 break;
3744 }
3745 cb->args[0] = cpu;
3746
3747 return skb->len;
3748}
3749
3750static int ctnetlink_stat_exp_cpu(struct sk_buff *skb,
3751 const struct nfnl_info *info,
3752 const struct nlattr * const cda[])
3753{
3754 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3755 struct netlink_dump_control c = {
3756 .dump = ctnetlink_exp_stat_cpu_dump,
3757 };
3758 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3759 }
3760
3761 return 0;
3762}
3763
3764#ifdef CONFIG_NF_CONNTRACK_EVENTS
3765static struct nf_ct_event_notifier ctnl_notifier = {
3766 .ct_event = ctnetlink_conntrack_event,
3767 .exp_event = ctnetlink_expect_event,
3768};
3769#endif
3770
3771static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3772 [IPCTNL_MSG_CT_NEW] = {
3773 .call = ctnetlink_new_conntrack,
3774 .type = NFNL_CB_MUTEX,
3775 .attr_count = CTA_MAX,
3776 .policy = ct_nla_policy
3777 },
3778 [IPCTNL_MSG_CT_GET] = {
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_DELETE] = {
3785 .call = ctnetlink_del_conntrack,
3786 .type = NFNL_CB_MUTEX,
3787 .attr_count = CTA_MAX,
3788 .policy = ct_nla_policy
3789 },
3790 [IPCTNL_MSG_CT_GET_CTRZERO] = {
3791 .call = ctnetlink_get_conntrack,
3792 .type = NFNL_CB_MUTEX,
3793 .attr_count = CTA_MAX,
3794 .policy = ct_nla_policy
3795 },
3796 [IPCTNL_MSG_CT_GET_STATS_CPU] = {
3797 .call = ctnetlink_stat_ct_cpu,
3798 .type = NFNL_CB_MUTEX,
3799 },
3800 [IPCTNL_MSG_CT_GET_STATS] = {
3801 .call = ctnetlink_stat_ct,
3802 .type = NFNL_CB_MUTEX,
3803 },
3804 [IPCTNL_MSG_CT_GET_DYING] = {
3805 .call = ctnetlink_get_ct_dying,
3806 .type = NFNL_CB_MUTEX,
3807 },
3808 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = {
3809 .call = ctnetlink_get_ct_unconfirmed,
3810 .type = NFNL_CB_MUTEX,
3811 },
3812};
3813
3814static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3815 [IPCTNL_MSG_EXP_GET] = {
3816 .call = ctnetlink_get_expect,
3817 .type = NFNL_CB_MUTEX,
3818 .attr_count = CTA_EXPECT_MAX,
3819 .policy = exp_nla_policy
3820 },
3821 [IPCTNL_MSG_EXP_NEW] = {
3822 .call = ctnetlink_new_expect,
3823 .type = NFNL_CB_MUTEX,
3824 .attr_count = CTA_EXPECT_MAX,
3825 .policy = exp_nla_policy
3826 },
3827 [IPCTNL_MSG_EXP_DELETE] = {
3828 .call = ctnetlink_del_expect,
3829 .type = NFNL_CB_MUTEX,
3830 .attr_count = CTA_EXPECT_MAX,
3831 .policy = exp_nla_policy
3832 },
3833 [IPCTNL_MSG_EXP_GET_STATS_CPU] = {
3834 .call = ctnetlink_stat_exp_cpu,
3835 .type = NFNL_CB_MUTEX,
3836 },
3837};
3838
3839static const struct nfnetlink_subsystem ctnl_subsys = {
3840 .name = "conntrack",
3841 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3842 .cb_count = IPCTNL_MSG_MAX,
3843 .cb = ctnl_cb,
3844};
3845
3846static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3847 .name = "conntrack_expect",
3848 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3849 .cb_count = IPCTNL_MSG_EXP_MAX,
3850 .cb = ctnl_exp_cb,
3851};
3852
3853MODULE_ALIAS("ip_conntrack_netlink");
3854MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3855MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3856
3857static int __net_init ctnetlink_net_init(struct net *net)
3858{
3859#ifdef CONFIG_NF_CONNTRACK_EVENTS
3860 nf_conntrack_register_notifier(net, &ctnl_notifier);
3861#endif
3862 return 0;
3863}
3864
3865static void ctnetlink_net_pre_exit(struct net *net)
3866{
3867#ifdef CONFIG_NF_CONNTRACK_EVENTS
3868 nf_conntrack_unregister_notifier(net);
3869#endif
3870}
3871
3872static struct pernet_operations ctnetlink_net_ops = {
3873 .init = ctnetlink_net_init,
3874 .pre_exit = ctnetlink_net_pre_exit,
3875};
3876
3877static int __init ctnetlink_init(void)
3878{
3879 int ret;
3880
3881 ret = nfnetlink_subsys_register(&ctnl_subsys);
3882 if (ret < 0) {
3883 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3884 goto err_out;
3885 }
3886
3887 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3888 if (ret < 0) {
3889 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3890 goto err_unreg_subsys;
3891 }
3892
3893 ret = register_pernet_subsys(&ctnetlink_net_ops);
3894 if (ret < 0) {
3895 pr_err("ctnetlink_init: cannot register pernet operations\n");
3896 goto err_unreg_exp_subsys;
3897 }
3898#ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3899
3900 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3901#endif
3902 return 0;
3903
3904err_unreg_exp_subsys:
3905 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3906err_unreg_subsys:
3907 nfnetlink_subsys_unregister(&ctnl_subsys);
3908err_out:
3909 return ret;
3910}
3911
3912static void __exit ctnetlink_exit(void)
3913{
3914 unregister_pernet_subsys(&ctnetlink_net_ops);
3915 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3916 nfnetlink_subsys_unregister(&ctnl_subsys);
3917#ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3918 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3919#endif
3920 synchronize_rcu();
3921}
3922
3923module_init(ctnetlink_init);
3924module_exit(ctnetlink_exit);
3925
