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Merge tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux
[mirror_ubuntu-jammy-kernel.git] / net / netfilter / nf_conntrack_netlink.c
1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/security.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
32 #include <linux/siphash.h>
33
34 #include <linux/netfilter.h>
35 #include <net/netlink.h>
36 #include <net/sock.h>
37 #include <net/netfilter/nf_conntrack.h>
38 #include <net/netfilter/nf_conntrack_core.h>
39 #include <net/netfilter/nf_conntrack_expect.h>
40 #include <net/netfilter/nf_conntrack_helper.h>
41 #include <net/netfilter/nf_conntrack_seqadj.h>
42 #include <net/netfilter/nf_conntrack_l4proto.h>
43 #include <net/netfilter/nf_conntrack_tuple.h>
44 #include <net/netfilter/nf_conntrack_acct.h>
45 #include <net/netfilter/nf_conntrack_zones.h>
46 #include <net/netfilter/nf_conntrack_timestamp.h>
47 #include <net/netfilter/nf_conntrack_labels.h>
48 #include <net/netfilter/nf_conntrack_synproxy.h>
49 #if IS_ENABLED(CONFIG_NF_NAT)
50 #include <net/netfilter/nf_nat.h>
51 #include <net/netfilter/nf_nat_helper.h>
52 #endif
53
54 #include <linux/netfilter/nfnetlink.h>
55 #include <linux/netfilter/nfnetlink_conntrack.h>
56
57 #include "nf_internals.h"
58
59 MODULE_LICENSE("GPL");
60
61 static 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
81 nla_put_failure:
82 return -1;
83 }
84
85 static 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
94 static 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
103 static 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
126 nla_put_failure:
127 return -1;
128 }
129
130 static 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
147 static 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
156 nla_put_failure:
157 return -1;
158 }
159
160 static 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
166 nla_put_failure:
167 return -1;
168 }
169
170 static 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
182 nla_put_failure:
183 return -1;
184 }
185
186 static 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
207 nla_put_failure:
208 return -1;
209 }
210
211 static 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);
236 out:
237 rcu_read_unlock();
238 return 0;
239
240 nla_put_failure:
241 rcu_read_unlock();
242 return -1;
243 }
244
245 static int
246 dump_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
276 nla_put_failure:
277 return -1;
278 }
279
280 static int
281 ctnetlink_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
296 static int
297 ctnetlink_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
320 nla_put_failure:
321 return -1;
322 }
323
324 #ifdef CONFIG_NF_CONNTRACK_MARK
325 static 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
331 nla_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
339 static 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;
359 nla_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
368 static 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
377 static int
378 ctnetlink_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
403 static 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
419 nla_put_failure:
420 return -1;
421 }
422
423 static int
424 dump_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
444 nla_put_failure:
445 return -1;
446 }
447
448 static 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;
467 err:
468 spin_unlock_bh(&ct->lock);
469 return -1;
470 }
471
472 static 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
493 nla_put_failure:
494 return -1;
495 }
496
497 static 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
505 nla_put_failure:
506 return -1;
507 }
508
509 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
510 {
511 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
512 goto nla_put_failure;
513 return 0;
514
515 nla_put_failure:
516 return -1;
517 }
518
519 /* all these functions access ct->ext. Caller must either hold a reference
520 * on ct or prevent its deletion by holding either the bucket spinlock or
521 * pcpu dying list lock.
522 */
523 static 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
537 static 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
555 static int
556 ctnetlink_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
606 nlmsg_failure:
607 nla_put_failure:
608 nlmsg_cancel(skb, nlh);
609 return -1;
610 }
611
612 static 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)
620 static 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; /* ORIG, REPLY, MASTER */
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; /* ORIG, REPLY, MASTER */
633 }
634
635 return len + len4;
636 }
637 #endif
638
639 static 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) /* CTA_COUNTERS_ORIG|REPL */
644 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
645 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
646 ;
647 }
648
649 static 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) /* CTA_SECCTX */
659 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
660 #else
661 return 0;
662 #endif
663 }
664
665 static 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
677 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
678 {
679 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
680 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
681 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
682 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
683 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
684 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
685 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
686 + ctnetlink_acct_size(ct)
687 + ctnetlink_timestamp_size(ct)
688 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
689 + nla_total_size(0) /* CTA_PROTOINFO */
690 + nla_total_size(0) /* CTA_HELP */
691 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
692 + ctnetlink_secctx_size(ct)
693 #if IS_ENABLED(CONFIG_NF_NAT)
694 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
695 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
696 #endif
697 #ifdef CONFIG_NF_CONNTRACK_MARK
698 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
699 #endif
700 #ifdef CONFIG_NF_CONNTRACK_ZONES
701 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
702 #endif
703 + ctnetlink_proto_size(ct)
704 + ctnetlink_label_size(ct)
705 ;
706 }
707
708 static int
709 ctnetlink_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
835 nla_put_failure:
836 nlmsg_cancel(skb, nlh);
837 nlmsg_failure:
838 kfree_skb(skb);
839 errout:
840 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
841 return -ENOBUFS;
842
843 return 0;
844 }
845 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
846
847 static 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
855 struct ctnetlink_filter_u32 {
856 u32 val;
857 u32 mask;
858 };
859
860 struct 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
874 static 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
879 static 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
905 static int ctnetlink_parse_zone(const struct nlattr *attr,
906 struct nf_conntrack_zone *zone);
907 static 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
913 static 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
931 static 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 /* status->val == 0? always true, else always false. */
942 if (status->mask == 0)
943 return -EINVAL;
944 } else if (cda[CTA_STATUS_MASK]) {
945 return -EINVAL;
946 }
947
948 /* CTA_STATUS is NLA_U32, if this fires UAPI needs to be extended */
949 BUILD_BUG_ON(__IPS_MAX_BIT >= 32);
950 return 0;
951 }
952
953 static struct ctnetlink_filter *
954 ctnetlink_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->orig_flags);
1015 if (err < 0) {
1016 err = -EINVAL;
1017 goto err_filter;
1018 }
1019 }
1020
1021 return filter;
1022
1023 err_filter:
1024 kfree(filter);
1025
1026 return ERR_PTR(err);
1027 }
1028
1029 static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
1030 {
1031 return family || cda[CTA_MARK] || cda[CTA_FILTER] || cda[CTA_STATUS];
1032 }
1033
1034 static int ctnetlink_start(struct netlink_callback *cb)
1035 {
1036 const struct nlattr * const *cda = cb->data;
1037 struct ctnetlink_filter *filter = NULL;
1038 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1039 u8 family = nfmsg->nfgen_family;
1040
1041 if (ctnetlink_needs_filter(family, cda)) {
1042 filter = ctnetlink_alloc_filter(cda, family);
1043 if (IS_ERR(filter))
1044 return PTR_ERR(filter);
1045 }
1046
1047 cb->data = filter;
1048 return 0;
1049 }
1050
1051 static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
1052 struct nf_conntrack_tuple *ct_tuple,
1053 u_int32_t flags, int family)
1054 {
1055 switch (family) {
1056 case NFPROTO_IPV4:
1057 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1058 filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
1059 return 0;
1060
1061 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1062 filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
1063 return 0;
1064 break;
1065 case NFPROTO_IPV6:
1066 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1067 !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
1068 &ct_tuple->src.u3.in6))
1069 return 0;
1070
1071 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1072 !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
1073 &ct_tuple->dst.u3.in6))
1074 return 0;
1075 break;
1076 }
1077
1078 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
1079 filter_tuple->dst.protonum != ct_tuple->dst.protonum)
1080 return 0;
1081
1082 switch (ct_tuple->dst.protonum) {
1083 case IPPROTO_TCP:
1084 case IPPROTO_UDP:
1085 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
1086 filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
1087 return 0;
1088
1089 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
1090 filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
1091 return 0;
1092 break;
1093 case IPPROTO_ICMP:
1094 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
1095 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1096 return 0;
1097 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
1098 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1099 return 0;
1100 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
1101 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1102 return 0;
1103 break;
1104 case IPPROTO_ICMPV6:
1105 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
1106 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1107 return 0;
1108 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
1109 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1110 return 0;
1111 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
1112 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1113 return 0;
1114 break;
1115 }
1116
1117 return 1;
1118 }
1119
1120 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
1121 {
1122 struct ctnetlink_filter *filter = data;
1123 struct nf_conntrack_tuple *tuple;
1124 u32 status;
1125
1126 if (filter == NULL)
1127 goto out;
1128
1129 /* Match entries of a given L3 protocol number.
1130 * If it is not specified, ie. l3proto == 0,
1131 * then match everything.
1132 */
1133 if (filter->family && nf_ct_l3num(ct) != filter->family)
1134 goto ignore_entry;
1135
1136 if (filter->orig_flags) {
1137 tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
1138 if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
1139 filter->orig_flags,
1140 filter->family))
1141 goto ignore_entry;
1142 }
1143
1144 if (filter->reply_flags) {
1145 tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
1146 if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
1147 filter->reply_flags,
1148 filter->family))
1149 goto ignore_entry;
1150 }
1151
1152 #ifdef CONFIG_NF_CONNTRACK_MARK
1153 if ((ct->mark & filter->mark.mask) != filter->mark.val)
1154 goto ignore_entry;
1155 #endif
1156 status = (u32)READ_ONCE(ct->status);
1157 if ((status & filter->status.mask) != filter->status.val)
1158 goto ignore_entry;
1159
1160 out:
1161 return 1;
1162
1163 ignore_entry:
1164 return 0;
1165 }
1166
1167 static int
1168 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1169 {
1170 unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
1171 struct net *net = sock_net(skb->sk);
1172 struct nf_conn *ct, *last;
1173 struct nf_conntrack_tuple_hash *h;
1174 struct hlist_nulls_node *n;
1175 struct nf_conn *nf_ct_evict[8];
1176 int res, i;
1177 spinlock_t *lockp;
1178
1179 last = (struct nf_conn *)cb->args[1];
1180 i = 0;
1181
1182 local_bh_disable();
1183 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
1184 restart:
1185 while (i) {
1186 i--;
1187 if (nf_ct_should_gc(nf_ct_evict[i]))
1188 nf_ct_kill(nf_ct_evict[i]);
1189 nf_ct_put(nf_ct_evict[i]);
1190 }
1191
1192 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
1193 nf_conntrack_lock(lockp);
1194 if (cb->args[0] >= nf_conntrack_htable_size) {
1195 spin_unlock(lockp);
1196 goto out;
1197 }
1198 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
1199 hnnode) {
1200 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
1201 continue;
1202 ct = nf_ct_tuplehash_to_ctrack(h);
1203 if (nf_ct_is_expired(ct)) {
1204 if (i < ARRAY_SIZE(nf_ct_evict) &&
1205 atomic_inc_not_zero(&ct->ct_general.use))
1206 nf_ct_evict[i++] = ct;
1207 continue;
1208 }
1209
1210 if (!net_eq(net, nf_ct_net(ct)))
1211 continue;
1212
1213 if (cb->args[1]) {
1214 if (ct != last)
1215 continue;
1216 cb->args[1] = 0;
1217 }
1218 if (!ctnetlink_filter_match(ct, cb->data))
1219 continue;
1220
1221 res =
1222 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1223 cb->nlh->nlmsg_seq,
1224 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1225 ct, true, flags);
1226 if (res < 0) {
1227 nf_conntrack_get(&ct->ct_general);
1228 cb->args[1] = (unsigned long)ct;
1229 spin_unlock(lockp);
1230 goto out;
1231 }
1232 }
1233 spin_unlock(lockp);
1234 if (cb->args[1]) {
1235 cb->args[1] = 0;
1236 goto restart;
1237 }
1238 }
1239 out:
1240 local_bh_enable();
1241 if (last) {
1242 /* nf ct hash resize happened, now clear the leftover. */
1243 if ((struct nf_conn *)cb->args[1] == last)
1244 cb->args[1] = 0;
1245
1246 nf_ct_put(last);
1247 }
1248
1249 while (i) {
1250 i--;
1251 if (nf_ct_should_gc(nf_ct_evict[i]))
1252 nf_ct_kill(nf_ct_evict[i]);
1253 nf_ct_put(nf_ct_evict[i]);
1254 }
1255
1256 return skb->len;
1257 }
1258
1259 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
1260 struct nf_conntrack_tuple *t,
1261 u_int32_t flags)
1262 {
1263 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1264 if (!tb[CTA_IP_V4_SRC])
1265 return -EINVAL;
1266
1267 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1268 }
1269
1270 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1271 if (!tb[CTA_IP_V4_DST])
1272 return -EINVAL;
1273
1274 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1275 }
1276
1277 return 0;
1278 }
1279
1280 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1281 struct nf_conntrack_tuple *t,
1282 u_int32_t flags)
1283 {
1284 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1285 if (!tb[CTA_IP_V6_SRC])
1286 return -EINVAL;
1287
1288 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1289 }
1290
1291 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1292 if (!tb[CTA_IP_V6_DST])
1293 return -EINVAL;
1294
1295 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1296 }
1297
1298 return 0;
1299 }
1300
1301 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1302 struct nf_conntrack_tuple *tuple,
1303 u_int32_t flags)
1304 {
1305 struct nlattr *tb[CTA_IP_MAX+1];
1306 int ret = 0;
1307
1308 ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
1309 if (ret < 0)
1310 return ret;
1311
1312 ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
1313 cta_ip_nla_policy, NULL);
1314 if (ret)
1315 return ret;
1316
1317 switch (tuple->src.l3num) {
1318 case NFPROTO_IPV4:
1319 ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
1320 break;
1321 case NFPROTO_IPV6:
1322 ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
1323 break;
1324 }
1325
1326 return ret;
1327 }
1328
1329 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1330 [CTA_PROTO_NUM] = { .type = NLA_U8 },
1331 };
1332
1333 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1334 struct nf_conntrack_tuple *tuple,
1335 u_int32_t flags)
1336 {
1337 const struct nf_conntrack_l4proto *l4proto;
1338 struct nlattr *tb[CTA_PROTO_MAX+1];
1339 int ret = 0;
1340
1341 ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1342 proto_nla_policy, NULL);
1343 if (ret < 0)
1344 return ret;
1345
1346 if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
1347 return 0;
1348
1349 if (!tb[CTA_PROTO_NUM])
1350 return -EINVAL;
1351
1352 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1353
1354 rcu_read_lock();
1355 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1356
1357 if (likely(l4proto->nlattr_to_tuple)) {
1358 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1359 l4proto->nla_policy,
1360 NULL);
1361 if (ret == 0)
1362 ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
1363 }
1364
1365 rcu_read_unlock();
1366
1367 return ret;
1368 }
1369
1370 static int
1371 ctnetlink_parse_zone(const struct nlattr *attr,
1372 struct nf_conntrack_zone *zone)
1373 {
1374 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1375 NF_CT_DEFAULT_ZONE_DIR, 0);
1376 #ifdef CONFIG_NF_CONNTRACK_ZONES
1377 if (attr)
1378 zone->id = ntohs(nla_get_be16(attr));
1379 #else
1380 if (attr)
1381 return -EOPNOTSUPP;
1382 #endif
1383 return 0;
1384 }
1385
1386 static int
1387 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1388 struct nf_conntrack_zone *zone)
1389 {
1390 int ret;
1391
1392 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1393 return -EINVAL;
1394
1395 ret = ctnetlink_parse_zone(attr, zone);
1396 if (ret < 0)
1397 return ret;
1398
1399 if (type == CTA_TUPLE_REPLY)
1400 zone->dir = NF_CT_ZONE_DIR_REPL;
1401 else
1402 zone->dir = NF_CT_ZONE_DIR_ORIG;
1403
1404 return 0;
1405 }
1406
1407 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1408 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1409 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1410 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1411 };
1412
1413 #define CTA_FILTER_F_ALL_CTA_PROTO \
1414 (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
1415 CTA_FILTER_F_CTA_PROTO_DST_PORT | \
1416 CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
1417 CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
1418 CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
1419 CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
1420 CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
1421 CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
1422
1423 static int
1424 ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
1425 struct nf_conntrack_tuple *tuple, u32 type,
1426 u_int8_t l3num, struct nf_conntrack_zone *zone,
1427 u_int32_t flags)
1428 {
1429 struct nlattr *tb[CTA_TUPLE_MAX+1];
1430 int err;
1431
1432 memset(tuple, 0, sizeof(*tuple));
1433
1434 err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1435 tuple_nla_policy, NULL);
1436 if (err < 0)
1437 return err;
1438
1439 if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1440 return -EOPNOTSUPP;
1441 tuple->src.l3num = l3num;
1442
1443 if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
1444 flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1445 if (!tb[CTA_TUPLE_IP])
1446 return -EINVAL;
1447
1448 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
1449 if (err < 0)
1450 return err;
1451 }
1452
1453 if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
1454 if (!tb[CTA_TUPLE_PROTO])
1455 return -EINVAL;
1456
1457 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
1458 if (err < 0)
1459 return err;
1460 } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
1461 /* Can't manage proto flags without a protonum */
1462 return -EINVAL;
1463 }
1464
1465 if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
1466 if (!zone)
1467 return -EINVAL;
1468
1469 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1470 type, zone);
1471 if (err < 0)
1472 return err;
1473 }
1474
1475 /* orig and expect tuples get DIR_ORIGINAL */
1476 if (type == CTA_TUPLE_REPLY)
1477 tuple->dst.dir = IP_CT_DIR_REPLY;
1478 else
1479 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1480
1481 return 0;
1482 }
1483
1484 static int
1485 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1486 struct nf_conntrack_tuple *tuple, u32 type,
1487 u_int8_t l3num, struct nf_conntrack_zone *zone)
1488 {
1489 return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
1490 CTA_FILTER_FLAG(ALL));
1491 }
1492
1493 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1494 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1495 .len = NF_CT_HELPER_NAME_LEN - 1 },
1496 };
1497
1498 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1499 struct nlattr **helpinfo)
1500 {
1501 int err;
1502 struct nlattr *tb[CTA_HELP_MAX+1];
1503
1504 err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1505 help_nla_policy, NULL);
1506 if (err < 0)
1507 return err;
1508
1509 if (!tb[CTA_HELP_NAME])
1510 return -EINVAL;
1511
1512 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1513
1514 if (tb[CTA_HELP_INFO])
1515 *helpinfo = tb[CTA_HELP_INFO];
1516
1517 return 0;
1518 }
1519
1520 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1521 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1522 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1523 [CTA_STATUS] = { .type = NLA_U32 },
1524 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1525 [CTA_HELP] = { .type = NLA_NESTED },
1526 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1527 [CTA_TIMEOUT] = { .type = NLA_U32 },
1528 [CTA_MARK] = { .type = NLA_U32 },
1529 [CTA_ID] = { .type = NLA_U32 },
1530 [CTA_NAT_DST] = { .type = NLA_NESTED },
1531 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1532 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1533 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1534 [CTA_ZONE] = { .type = NLA_U16 },
1535 [CTA_MARK_MASK] = { .type = NLA_U32 },
1536 [CTA_LABELS] = { .type = NLA_BINARY,
1537 .len = NF_CT_LABELS_MAX_SIZE },
1538 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1539 .len = NF_CT_LABELS_MAX_SIZE },
1540 [CTA_FILTER] = { .type = NLA_NESTED },
1541 [CTA_STATUS_MASK] = { .type = NLA_U32 },
1542 };
1543
1544 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1545 {
1546 if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1547 return 0;
1548
1549 return ctnetlink_filter_match(ct, data);
1550 }
1551
1552 static int ctnetlink_flush_conntrack(struct net *net,
1553 const struct nlattr * const cda[],
1554 u32 portid, int report, u8 family)
1555 {
1556 struct ctnetlink_filter *filter = NULL;
1557
1558 if (ctnetlink_needs_filter(family, cda)) {
1559 if (cda[CTA_FILTER])
1560 return -EOPNOTSUPP;
1561
1562 filter = ctnetlink_alloc_filter(cda, family);
1563 if (IS_ERR(filter))
1564 return PTR_ERR(filter);
1565 }
1566
1567 nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
1568 portid, report);
1569 kfree(filter);
1570
1571 return 0;
1572 }
1573
1574 static int ctnetlink_del_conntrack(struct sk_buff *skb,
1575 const struct nfnl_info *info,
1576 const struct nlattr * const cda[])
1577 {
1578 u8 family = info->nfmsg->nfgen_family;
1579 struct nf_conntrack_tuple_hash *h;
1580 struct nf_conntrack_tuple tuple;
1581 struct nf_conntrack_zone zone;
1582 struct nf_conn *ct;
1583 int err;
1584
1585 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1586 if (err < 0)
1587 return err;
1588
1589 if (cda[CTA_TUPLE_ORIG])
1590 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1591 family, &zone);
1592 else if (cda[CTA_TUPLE_REPLY])
1593 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1594 family, &zone);
1595 else {
1596 u_int8_t u3 = info->nfmsg->version ? family : AF_UNSPEC;
1597
1598 return ctnetlink_flush_conntrack(info->net, cda,
1599 NETLINK_CB(skb).portid,
1600 nlmsg_report(info->nlh), u3);
1601 }
1602
1603 if (err < 0)
1604 return err;
1605
1606 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1607 if (!h)
1608 return -ENOENT;
1609
1610 ct = nf_ct_tuplehash_to_ctrack(h);
1611
1612 if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1613 nf_ct_put(ct);
1614 return -EBUSY;
1615 }
1616
1617 if (cda[CTA_ID]) {
1618 __be32 id = nla_get_be32(cda[CTA_ID]);
1619
1620 if (id != (__force __be32)nf_ct_get_id(ct)) {
1621 nf_ct_put(ct);
1622 return -ENOENT;
1623 }
1624 }
1625
1626 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(info->nlh));
1627 nf_ct_put(ct);
1628
1629 return 0;
1630 }
1631
1632 static int ctnetlink_get_conntrack(struct sk_buff *skb,
1633 const struct nfnl_info *info,
1634 const struct nlattr * const cda[])
1635 {
1636 u_int8_t u3 = info->nfmsg->nfgen_family;
1637 struct nf_conntrack_tuple_hash *h;
1638 struct nf_conntrack_tuple tuple;
1639 struct nf_conntrack_zone zone;
1640 struct sk_buff *skb2;
1641 struct nf_conn *ct;
1642 int err;
1643
1644 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1645 struct netlink_dump_control c = {
1646 .start = ctnetlink_start,
1647 .dump = ctnetlink_dump_table,
1648 .done = ctnetlink_done,
1649 .data = (void *)cda,
1650 };
1651
1652 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1653 }
1654
1655 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1656 if (err < 0)
1657 return err;
1658
1659 if (cda[CTA_TUPLE_ORIG])
1660 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1661 u3, &zone);
1662 else if (cda[CTA_TUPLE_REPLY])
1663 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1664 u3, &zone);
1665 else
1666 return -EINVAL;
1667
1668 if (err < 0)
1669 return err;
1670
1671 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1672 if (!h)
1673 return -ENOENT;
1674
1675 ct = nf_ct_tuplehash_to_ctrack(h);
1676
1677 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1678 if (!skb2) {
1679 nf_ct_put(ct);
1680 return -ENOMEM;
1681 }
1682
1683 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid,
1684 info->nlh->nlmsg_seq,
1685 NFNL_MSG_TYPE(info->nlh->nlmsg_type), ct,
1686 true, 0);
1687 nf_ct_put(ct);
1688 if (err <= 0) {
1689 kfree_skb(skb2);
1690 return -ENOMEM;
1691 }
1692
1693 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
1694 }
1695
1696 static int ctnetlink_done_list(struct netlink_callback *cb)
1697 {
1698 if (cb->args[1])
1699 nf_ct_put((struct nf_conn *)cb->args[1]);
1700 return 0;
1701 }
1702
1703 static int
1704 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1705 {
1706 struct nf_conn *ct, *last;
1707 struct nf_conntrack_tuple_hash *h;
1708 struct hlist_nulls_node *n;
1709 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1710 u_int8_t l3proto = nfmsg->nfgen_family;
1711 int res;
1712 int cpu;
1713 struct hlist_nulls_head *list;
1714 struct net *net = sock_net(skb->sk);
1715
1716 if (cb->args[2])
1717 return 0;
1718
1719 last = (struct nf_conn *)cb->args[1];
1720
1721 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1722 struct ct_pcpu *pcpu;
1723
1724 if (!cpu_possible(cpu))
1725 continue;
1726
1727 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1728 spin_lock_bh(&pcpu->lock);
1729 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1730 restart:
1731 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1732 ct = nf_ct_tuplehash_to_ctrack(h);
1733 if (l3proto && nf_ct_l3num(ct) != l3proto)
1734 continue;
1735 if (cb->args[1]) {
1736 if (ct != last)
1737 continue;
1738 cb->args[1] = 0;
1739 }
1740
1741 /* We can't dump extension info for the unconfirmed
1742 * list because unconfirmed conntracks can have
1743 * ct->ext reallocated (and thus freed).
1744 *
1745 * In the dying list case ct->ext can't be free'd
1746 * until after we drop pcpu->lock.
1747 */
1748 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1749 cb->nlh->nlmsg_seq,
1750 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1751 ct, dying ? true : false, 0);
1752 if (res < 0) {
1753 if (!atomic_inc_not_zero(&ct->ct_general.use))
1754 continue;
1755 cb->args[0] = cpu;
1756 cb->args[1] = (unsigned long)ct;
1757 spin_unlock_bh(&pcpu->lock);
1758 goto out;
1759 }
1760 }
1761 if (cb->args[1]) {
1762 cb->args[1] = 0;
1763 goto restart;
1764 }
1765 spin_unlock_bh(&pcpu->lock);
1766 }
1767 cb->args[2] = 1;
1768 out:
1769 if (last)
1770 nf_ct_put(last);
1771
1772 return skb->len;
1773 }
1774
1775 static int
1776 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1777 {
1778 return ctnetlink_dump_list(skb, cb, true);
1779 }
1780
1781 static int ctnetlink_get_ct_dying(struct sk_buff *skb,
1782 const struct nfnl_info *info,
1783 const struct nlattr * const cda[])
1784 {
1785 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1786 struct netlink_dump_control c = {
1787 .dump = ctnetlink_dump_dying,
1788 .done = ctnetlink_done_list,
1789 };
1790 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1791 }
1792
1793 return -EOPNOTSUPP;
1794 }
1795
1796 static int
1797 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1798 {
1799 return ctnetlink_dump_list(skb, cb, false);
1800 }
1801
1802 static int ctnetlink_get_ct_unconfirmed(struct sk_buff *skb,
1803 const struct nfnl_info *info,
1804 const struct nlattr * const cda[])
1805 {
1806 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1807 struct netlink_dump_control c = {
1808 .dump = ctnetlink_dump_unconfirmed,
1809 .done = ctnetlink_done_list,
1810 };
1811 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1812 }
1813
1814 return -EOPNOTSUPP;
1815 }
1816
1817 #if IS_ENABLED(CONFIG_NF_NAT)
1818 static int
1819 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1820 enum nf_nat_manip_type manip,
1821 const struct nlattr *attr)
1822 __must_hold(RCU)
1823 {
1824 struct nf_nat_hook *nat_hook;
1825 int err;
1826
1827 nat_hook = rcu_dereference(nf_nat_hook);
1828 if (!nat_hook) {
1829 #ifdef CONFIG_MODULES
1830 rcu_read_unlock();
1831 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1832 if (request_module("nf-nat") < 0) {
1833 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1834 rcu_read_lock();
1835 return -EOPNOTSUPP;
1836 }
1837 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1838 rcu_read_lock();
1839 nat_hook = rcu_dereference(nf_nat_hook);
1840 if (nat_hook)
1841 return -EAGAIN;
1842 #endif
1843 return -EOPNOTSUPP;
1844 }
1845
1846 err = nat_hook->parse_nat_setup(ct, manip, attr);
1847 if (err == -EAGAIN) {
1848 #ifdef CONFIG_MODULES
1849 rcu_read_unlock();
1850 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1851 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1852 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1853 rcu_read_lock();
1854 return -EOPNOTSUPP;
1855 }
1856 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1857 rcu_read_lock();
1858 #else
1859 err = -EOPNOTSUPP;
1860 #endif
1861 }
1862 return err;
1863 }
1864 #endif
1865
1866 static void
1867 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1868 unsigned long off)
1869 {
1870 unsigned int bit;
1871
1872 /* Ignore these unchangable bits */
1873 on &= ~IPS_UNCHANGEABLE_MASK;
1874 off &= ~IPS_UNCHANGEABLE_MASK;
1875
1876 for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1877 if (on & (1 << bit))
1878 set_bit(bit, &ct->status);
1879 else if (off & (1 << bit))
1880 clear_bit(bit, &ct->status);
1881 }
1882 }
1883
1884 static int
1885 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1886 {
1887 unsigned long d;
1888 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1889 d = ct->status ^ status;
1890
1891 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1892 /* unchangeable */
1893 return -EBUSY;
1894
1895 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1896 /* SEEN_REPLY bit can only be set */
1897 return -EBUSY;
1898
1899 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1900 /* ASSURED bit can only be set */
1901 return -EBUSY;
1902
1903 __ctnetlink_change_status(ct, status, 0);
1904 return 0;
1905 }
1906
1907 static int
1908 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1909 {
1910 #if IS_ENABLED(CONFIG_NF_NAT)
1911 int ret;
1912
1913 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1914 return 0;
1915
1916 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1917 cda[CTA_NAT_DST]);
1918 if (ret < 0)
1919 return ret;
1920
1921 return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1922 cda[CTA_NAT_SRC]);
1923 #else
1924 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1925 return 0;
1926 return -EOPNOTSUPP;
1927 #endif
1928 }
1929
1930 static int ctnetlink_change_helper(struct nf_conn *ct,
1931 const struct nlattr * const cda[])
1932 {
1933 struct nf_conntrack_helper *helper;
1934 struct nf_conn_help *help = nfct_help(ct);
1935 char *helpname = NULL;
1936 struct nlattr *helpinfo = NULL;
1937 int err;
1938
1939 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1940 if (err < 0)
1941 return err;
1942
1943 /* don't change helper of sibling connections */
1944 if (ct->master) {
1945 /* If we try to change the helper to the same thing twice,
1946 * treat the second attempt as a no-op instead of returning
1947 * an error.
1948 */
1949 err = -EBUSY;
1950 if (help) {
1951 rcu_read_lock();
1952 helper = rcu_dereference(help->helper);
1953 if (helper && !strcmp(helper->name, helpname))
1954 err = 0;
1955 rcu_read_unlock();
1956 }
1957
1958 return err;
1959 }
1960
1961 if (!strcmp(helpname, "")) {
1962 if (help && help->helper) {
1963 /* we had a helper before ... */
1964 nf_ct_remove_expectations(ct);
1965 RCU_INIT_POINTER(help->helper, NULL);
1966 }
1967
1968 return 0;
1969 }
1970
1971 rcu_read_lock();
1972 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1973 nf_ct_protonum(ct));
1974 if (helper == NULL) {
1975 rcu_read_unlock();
1976 return -EOPNOTSUPP;
1977 }
1978
1979 if (help) {
1980 if (help->helper == helper) {
1981 /* update private helper data if allowed. */
1982 if (helper->from_nlattr)
1983 helper->from_nlattr(helpinfo, ct);
1984 err = 0;
1985 } else
1986 err = -EBUSY;
1987 } else {
1988 /* we cannot set a helper for an existing conntrack */
1989 err = -EOPNOTSUPP;
1990 }
1991
1992 rcu_read_unlock();
1993 return err;
1994 }
1995
1996 static int ctnetlink_change_timeout(struct nf_conn *ct,
1997 const struct nlattr * const cda[])
1998 {
1999 u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2000
2001 if (timeout > INT_MAX)
2002 timeout = INT_MAX;
2003 ct->timeout = nfct_time_stamp + (u32)timeout;
2004
2005 if (test_bit(IPS_DYING_BIT, &ct->status))
2006 return -ETIME;
2007
2008 return 0;
2009 }
2010
2011 #if defined(CONFIG_NF_CONNTRACK_MARK)
2012 static void ctnetlink_change_mark(struct nf_conn *ct,
2013 const struct nlattr * const cda[])
2014 {
2015 u32 mark, newmark, mask = 0;
2016
2017 if (cda[CTA_MARK_MASK])
2018 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2019
2020 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2021 newmark = (ct->mark & mask) ^ mark;
2022 if (newmark != ct->mark)
2023 ct->mark = newmark;
2024 }
2025 #endif
2026
2027 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
2028 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
2029 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
2030 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
2031 };
2032
2033 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
2034 const struct nlattr * const cda[])
2035 {
2036 const struct nlattr *attr = cda[CTA_PROTOINFO];
2037 const struct nf_conntrack_l4proto *l4proto;
2038 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
2039 int err = 0;
2040
2041 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
2042 protoinfo_policy, NULL);
2043 if (err < 0)
2044 return err;
2045
2046 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
2047 if (l4proto->from_nlattr)
2048 err = l4proto->from_nlattr(tb, ct);
2049
2050 return err;
2051 }
2052
2053 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
2054 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
2055 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
2056 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
2057 };
2058
2059 static int change_seq_adj(struct nf_ct_seqadj *seq,
2060 const struct nlattr * const attr)
2061 {
2062 int err;
2063 struct nlattr *cda[CTA_SEQADJ_MAX+1];
2064
2065 err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
2066 seqadj_policy, NULL);
2067 if (err < 0)
2068 return err;
2069
2070 if (!cda[CTA_SEQADJ_CORRECTION_POS])
2071 return -EINVAL;
2072
2073 seq->correction_pos =
2074 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
2075
2076 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
2077 return -EINVAL;
2078
2079 seq->offset_before =
2080 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
2081
2082 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
2083 return -EINVAL;
2084
2085 seq->offset_after =
2086 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
2087
2088 return 0;
2089 }
2090
2091 static int
2092 ctnetlink_change_seq_adj(struct nf_conn *ct,
2093 const struct nlattr * const cda[])
2094 {
2095 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
2096 int ret = 0;
2097
2098 if (!seqadj)
2099 return 0;
2100
2101 spin_lock_bh(&ct->lock);
2102 if (cda[CTA_SEQ_ADJ_ORIG]) {
2103 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
2104 cda[CTA_SEQ_ADJ_ORIG]);
2105 if (ret < 0)
2106 goto err;
2107
2108 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2109 }
2110
2111 if (cda[CTA_SEQ_ADJ_REPLY]) {
2112 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
2113 cda[CTA_SEQ_ADJ_REPLY]);
2114 if (ret < 0)
2115 goto err;
2116
2117 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2118 }
2119
2120 spin_unlock_bh(&ct->lock);
2121 return 0;
2122 err:
2123 spin_unlock_bh(&ct->lock);
2124 return ret;
2125 }
2126
2127 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
2128 [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
2129 [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
2130 [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
2131 };
2132
2133 static int ctnetlink_change_synproxy(struct nf_conn *ct,
2134 const struct nlattr * const cda[])
2135 {
2136 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
2137 struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
2138 int err;
2139
2140 if (!synproxy)
2141 return 0;
2142
2143 err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
2144 cda[CTA_SYNPROXY], synproxy_policy,
2145 NULL);
2146 if (err < 0)
2147 return err;
2148
2149 if (!tb[CTA_SYNPROXY_ISN] ||
2150 !tb[CTA_SYNPROXY_ITS] ||
2151 !tb[CTA_SYNPROXY_TSOFF])
2152 return -EINVAL;
2153
2154 synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
2155 synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
2156 synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
2157
2158 return 0;
2159 }
2160
2161 static int
2162 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
2163 {
2164 #ifdef CONFIG_NF_CONNTRACK_LABELS
2165 size_t len = nla_len(cda[CTA_LABELS]);
2166 const void *mask = cda[CTA_LABELS_MASK];
2167
2168 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
2169 return -EINVAL;
2170
2171 if (mask) {
2172 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
2173 nla_len(cda[CTA_LABELS_MASK]) != len)
2174 return -EINVAL;
2175 mask = nla_data(cda[CTA_LABELS_MASK]);
2176 }
2177
2178 len /= sizeof(u32);
2179
2180 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
2181 #else
2182 return -EOPNOTSUPP;
2183 #endif
2184 }
2185
2186 static int
2187 ctnetlink_change_conntrack(struct nf_conn *ct,
2188 const struct nlattr * const cda[])
2189 {
2190 int err;
2191
2192 /* only allow NAT changes and master assignation for new conntracks */
2193 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
2194 return -EOPNOTSUPP;
2195
2196 if (cda[CTA_HELP]) {
2197 err = ctnetlink_change_helper(ct, cda);
2198 if (err < 0)
2199 return err;
2200 }
2201
2202 if (cda[CTA_TIMEOUT]) {
2203 err = ctnetlink_change_timeout(ct, cda);
2204 if (err < 0)
2205 return err;
2206 }
2207
2208 if (cda[CTA_STATUS]) {
2209 err = ctnetlink_change_status(ct, cda);
2210 if (err < 0)
2211 return err;
2212 }
2213
2214 if (cda[CTA_PROTOINFO]) {
2215 err = ctnetlink_change_protoinfo(ct, cda);
2216 if (err < 0)
2217 return err;
2218 }
2219
2220 #if defined(CONFIG_NF_CONNTRACK_MARK)
2221 if (cda[CTA_MARK])
2222 ctnetlink_change_mark(ct, cda);
2223 #endif
2224
2225 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2226 err = ctnetlink_change_seq_adj(ct, cda);
2227 if (err < 0)
2228 return err;
2229 }
2230
2231 if (cda[CTA_SYNPROXY]) {
2232 err = ctnetlink_change_synproxy(ct, cda);
2233 if (err < 0)
2234 return err;
2235 }
2236
2237 if (cda[CTA_LABELS]) {
2238 err = ctnetlink_attach_labels(ct, cda);
2239 if (err < 0)
2240 return err;
2241 }
2242
2243 return 0;
2244 }
2245
2246 static struct nf_conn *
2247 ctnetlink_create_conntrack(struct net *net,
2248 const struct nf_conntrack_zone *zone,
2249 const struct nlattr * const cda[],
2250 struct nf_conntrack_tuple *otuple,
2251 struct nf_conntrack_tuple *rtuple,
2252 u8 u3)
2253 {
2254 struct nf_conn *ct;
2255 int err = -EINVAL;
2256 struct nf_conntrack_helper *helper;
2257 struct nf_conn_tstamp *tstamp;
2258 u64 timeout;
2259
2260 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
2261 if (IS_ERR(ct))
2262 return ERR_PTR(-ENOMEM);
2263
2264 if (!cda[CTA_TIMEOUT])
2265 goto err1;
2266
2267 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2268 if (timeout > INT_MAX)
2269 timeout = INT_MAX;
2270 ct->timeout = (u32)timeout + nfct_time_stamp;
2271
2272 rcu_read_lock();
2273 if (cda[CTA_HELP]) {
2274 char *helpname = NULL;
2275 struct nlattr *helpinfo = NULL;
2276
2277 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
2278 if (err < 0)
2279 goto err2;
2280
2281 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2282 nf_ct_protonum(ct));
2283 if (helper == NULL) {
2284 rcu_read_unlock();
2285 #ifdef CONFIG_MODULES
2286 if (request_module("nfct-helper-%s", helpname) < 0) {
2287 err = -EOPNOTSUPP;
2288 goto err1;
2289 }
2290
2291 rcu_read_lock();
2292 helper = __nf_conntrack_helper_find(helpname,
2293 nf_ct_l3num(ct),
2294 nf_ct_protonum(ct));
2295 if (helper) {
2296 err = -EAGAIN;
2297 goto err2;
2298 }
2299 rcu_read_unlock();
2300 #endif
2301 err = -EOPNOTSUPP;
2302 goto err1;
2303 } else {
2304 struct nf_conn_help *help;
2305
2306 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2307 if (help == NULL) {
2308 err = -ENOMEM;
2309 goto err2;
2310 }
2311 /* set private helper data if allowed. */
2312 if (helper->from_nlattr)
2313 helper->from_nlattr(helpinfo, ct);
2314
2315 /* not in hash table yet so not strictly necessary */
2316 RCU_INIT_POINTER(help->helper, helper);
2317 }
2318 } else {
2319 /* try an implicit helper assignation */
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 /* we must add conntrack extensions before confirmation. */
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 /* setup master conntrack: this is a confirmed expectation */
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
2401 err2:
2402 rcu_read_unlock();
2403 err1:
2404 nf_conntrack_free(ct);
2405 return ERR_PTR(err);
2406 }
2407
2408 static 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 /* implicit 'else' */
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
2506 static int
2507 ctnetlink_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
2539 nla_put_failure:
2540 nlmsg_failure:
2541 nlmsg_cancel(skb, nlh);
2542 return -1;
2543 }
2544
2545 static int
2546 ctnetlink_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
2572 static 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
2586 static int
2587 ctnetlink_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
2610 nla_put_failure:
2611 nlmsg_failure:
2612 nlmsg_cancel(skb, nlh);
2613 return -1;
2614 }
2615
2616 static 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
2638 static 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
2653 static struct nf_conntrack_expect *
2654 ctnetlink_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
2660 static size_t
2661 ctnetlink_glue_build_size(const struct nf_conn *ct)
2662 {
2663 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2664 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2665 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2666 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2667 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2668 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2669 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2670 + nla_total_size(0) /* CTA_PROTOINFO */
2671 + nla_total_size(0) /* CTA_HELP */
2672 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
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) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2678 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2679 #endif
2680 #ifdef CONFIG_NF_CONNTRACK_MARK
2681 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2682 #endif
2683 #ifdef CONFIG_NF_CONNTRACK_ZONES
2684 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2685 #endif
2686 + ctnetlink_proto_size(ct)
2687 ;
2688 }
2689
2690 static 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
2762 nla_put_failure:
2763 return -ENOSPC;
2764 }
2765
2766 static int
2767 ctnetlink_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
2787 nla_put_failure:
2788 return -ENOSPC;
2789 }
2790
2791 static int
2792 ctnetlink_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 /* SEEN_REPLY bit can only be set */
2799 return -EBUSY;
2800
2801 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2802 /* ASSURED bit can only be set */
2803 return -EBUSY;
2804
2805 /* This check is less strict than ctnetlink_change_status()
2806 * because callers often flip IPS_EXPECTED bits when sending
2807 * an NFQA_CT attribute to the kernel. So ignore the
2808 * unchangeable bits but do not error out. Also user programs
2809 * are allowed to clear the bits that they are allowed to change.
2810 */
2811 __ctnetlink_change_status(ct, status, ~status);
2812 return 0;
2813 }
2814
2815 static int
2816 ctnetlink_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
2848 static int
2849 ctnetlink_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
2862 static 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
2878 static int
2879 ctnetlink_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
2917 static 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
2926 static 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 /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2934
2935 /***********************************************************************
2936 * EXPECT
2937 ***********************************************************************/
2938
2939 static 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
2954 nla_put_failure:
2955 return -1;
2956 }
2957
2958 static 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
2992 nla_put_failure:
2993 return -1;
2994 }
2995
2996 static const union nf_inet_addr any_addr;
2997
2998 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2999 {
3000 static __read_mostly siphash_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
3017 static int
3018 ctnetlink_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
3084 nla_put_failure:
3085 return -1;
3086 }
3087
3088 static int
3089 ctnetlink_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
3107 nlmsg_failure:
3108 nla_put_failure:
3109 nlmsg_cancel(skb, nlh);
3110 return -1;
3111 }
3112
3113 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3114 static int
3115 ctnetlink_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
3154 nla_put_failure:
3155 nlmsg_cancel(skb, nlh);
3156 nlmsg_failure:
3157 kfree_skb(skb);
3158 errout:
3159 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
3160 return 0;
3161 }
3162 #endif
3163 static 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
3170 static int
3171 ctnetlink_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]++) {
3181 restart:
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 }
3211 out:
3212 rcu_read_unlock();
3213 if (last)
3214 nf_ct_expect_put(last);
3215
3216 return skb->len;
3217 }
3218
3219 static int
3220 ctnetlink_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];
3233 restart:
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;
3257 out:
3258 rcu_read_unlock();
3259 if (last)
3260 nf_ct_expect_put(last);
3261
3262 return skb->len;
3263 }
3264
3265 static 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 /* No expectation linked to this connection tracking. */
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
3311 static 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
3385 static 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
3395 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3396 {
3397 return true;
3398 }
3399
3400 static 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 /* delete a single expect by tuple */
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 /* bump usage count to 2 */
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 /* after list removal, usage count == 1 */
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 /* have to put what we 'get' above.
3443 * after this line usage count == 0 */
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 /* This basically means we have to flush everything*/
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 }
3460 static int
3461 ctnetlink_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
3475 static 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
3480 static int
3481 ctnetlink_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
3514 static struct nf_conntrack_expect *
3515 ctnetlink_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;
3571 err_out:
3572 nf_ct_expect_put(exp);
3573 return ERR_PTR(err);
3574 }
3575
3576 static int
3577 ctnetlink_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 /* caller guarantees that those three CTA_EXPECT_* exist */
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 /* Look for master conntrack of this expectation */
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);
3644 err_rcu:
3645 rcu_read_unlock();
3646 err_ct:
3647 nf_ct_put(ct);
3648 return err;
3649 }
3650
3651 static 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
3696 static int
3697 ctnetlink_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
3718 nla_put_failure:
3719 nlmsg_failure:
3720 nlmsg_cancel(skb, nlh);
3721 return -1;
3722 }
3723
3724 static int
3725 ctnetlink_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
3750 static 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
3765 static struct nf_ct_event_notifier ctnl_notifier = {
3766 .ct_event = ctnetlink_conntrack_event,
3767 .exp_event = ctnetlink_expect_event,
3768 };
3769 #endif
3770
3771 static 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
3814 static 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
3839 static 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
3846 static 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
3853 MODULE_ALIAS("ip_conntrack_netlink");
3854 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3855 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3856
3857 static 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
3865 static 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
3872 static struct pernet_operations ctnetlink_net_ops = {
3873 .init = ctnetlink_net_init,
3874 .pre_exit = ctnetlink_net_pre_exit,
3875 };
3876
3877 static 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 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3900 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3901 #endif
3902 return 0;
3903
3904 err_unreg_exp_subsys:
3905 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3906 err_unreg_subsys:
3907 nfnetlink_subsys_unregister(&ctnl_subsys);
3908 err_out:
3909 return ret;
3910 }
3911
3912 static 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
3923 module_init(ctnetlink_init);
3924 module_exit(ctnetlink_exit);
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