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