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