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)170 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
171 {
172 long timeout = nf_ct_expires(ct) / HZ;
173
174 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
175 goto nla_put_failure;
176 return 0;
177
178 nla_put_failure:
179 return -1;
180 }
181
ctnetlink_dump_protoinfo(struct sk_buff * skb,struct nf_conn * ct)182 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
183 {
184 const struct nf_conntrack_l4proto *l4proto;
185 struct nlattr *nest_proto;
186 int ret;
187
188 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
189 if (!l4proto->to_nlattr)
190 return 0;
191
192 nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
193 if (!nest_proto)
194 goto nla_put_failure;
195
196 ret = l4proto->to_nlattr(skb, nest_proto, ct);
197
198 nla_nest_end(skb, nest_proto);
199
200 return ret;
201
202 nla_put_failure:
203 return -1;
204 }
205
ctnetlink_dump_helpinfo(struct sk_buff * skb,const struct nf_conn * ct)206 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
207 const struct nf_conn *ct)
208 {
209 struct nlattr *nest_helper;
210 const struct nf_conn_help *help = nfct_help(ct);
211 struct nf_conntrack_helper *helper;
212
213 if (!help)
214 return 0;
215
216 helper = rcu_dereference(help->helper);
217 if (!helper)
218 goto out;
219
220 nest_helper = nla_nest_start(skb, CTA_HELP);
221 if (!nest_helper)
222 goto nla_put_failure;
223 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
224 goto nla_put_failure;
225
226 if (helper->to_nlattr)
227 helper->to_nlattr(skb, ct);
228
229 nla_nest_end(skb, nest_helper);
230 out:
231 return 0;
232
233 nla_put_failure:
234 return -1;
235 }
236
237 static int
dump_counters(struct sk_buff * skb,struct nf_conn_acct * acct,enum ip_conntrack_dir dir,int type)238 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
239 enum ip_conntrack_dir dir, int type)
240 {
241 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
242 struct nf_conn_counter *counter = acct->counter;
243 struct nlattr *nest_count;
244 u64 pkts, bytes;
245
246 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
247 pkts = atomic64_xchg(&counter[dir].packets, 0);
248 bytes = atomic64_xchg(&counter[dir].bytes, 0);
249 } else {
250 pkts = atomic64_read(&counter[dir].packets);
251 bytes = atomic64_read(&counter[dir].bytes);
252 }
253
254 nest_count = nla_nest_start(skb, attr);
255 if (!nest_count)
256 goto nla_put_failure;
257
258 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
259 CTA_COUNTERS_PAD) ||
260 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
261 CTA_COUNTERS_PAD))
262 goto nla_put_failure;
263
264 nla_nest_end(skb, nest_count);
265
266 return 0;
267
268 nla_put_failure:
269 return -1;
270 }
271
272 static int
ctnetlink_dump_acct(struct sk_buff * skb,const struct nf_conn * ct,int type)273 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
274 {
275 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
276
277 if (!acct)
278 return 0;
279
280 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
281 return -1;
282 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
283 return -1;
284
285 return 0;
286 }
287
288 static int
ctnetlink_dump_timestamp(struct sk_buff * skb,const struct nf_conn * ct)289 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
290 {
291 struct nlattr *nest_count;
292 const struct nf_conn_tstamp *tstamp;
293
294 tstamp = nf_conn_tstamp_find(ct);
295 if (!tstamp)
296 return 0;
297
298 nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
299 if (!nest_count)
300 goto nla_put_failure;
301
302 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
303 CTA_TIMESTAMP_PAD) ||
304 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
305 cpu_to_be64(tstamp->stop),
306 CTA_TIMESTAMP_PAD)))
307 goto nla_put_failure;
308 nla_nest_end(skb, nest_count);
309
310 return 0;
311
312 nla_put_failure:
313 return -1;
314 }
315
316 #ifdef CONFIG_NF_CONNTRACK_MARK
ctnetlink_dump_mark(struct sk_buff * skb,const struct nf_conn * ct)317 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
318 {
319 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
320 goto nla_put_failure;
321 return 0;
322
323 nla_put_failure:
324 return -1;
325 }
326 #else
327 #define ctnetlink_dump_mark(a, b) (0)
328 #endif
329
330 #ifdef CONFIG_NF_CONNTRACK_SECMARK
ctnetlink_dump_secctx(struct sk_buff * skb,const struct nf_conn * ct)331 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
332 {
333 struct nlattr *nest_secctx;
334 int len, ret;
335 char *secctx;
336
337 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
338 if (ret)
339 return 0;
340
341 ret = -1;
342 nest_secctx = nla_nest_start(skb, CTA_SECCTX);
343 if (!nest_secctx)
344 goto nla_put_failure;
345
346 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
347 goto nla_put_failure;
348 nla_nest_end(skb, nest_secctx);
349
350 ret = 0;
351 nla_put_failure:
352 security_release_secctx(secctx, len);
353 return ret;
354 }
355 #else
356 #define ctnetlink_dump_secctx(a, b) (0)
357 #endif
358
359 #ifdef CONFIG_NF_CONNTRACK_LABELS
ctnetlink_label_size(const struct nf_conn * ct)360 static inline int ctnetlink_label_size(const struct nf_conn *ct)
361 {
362 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
363
364 if (!labels)
365 return 0;
366 return nla_total_size(sizeof(labels->bits));
367 }
368
369 static int
ctnetlink_dump_labels(struct sk_buff * skb,const struct nf_conn * ct)370 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
371 {
372 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
373 unsigned int i;
374
375 if (!labels)
376 return 0;
377
378 i = 0;
379 do {
380 if (labels->bits[i] != 0)
381 return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
382 labels->bits);
383 i++;
384 } while (i < ARRAY_SIZE(labels->bits));
385
386 return 0;
387 }
388 #else
389 #define ctnetlink_dump_labels(a, b) (0)
390 #define ctnetlink_label_size(a) (0)
391 #endif
392
393 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
394
ctnetlink_dump_master(struct sk_buff * skb,const struct nf_conn * ct)395 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
396 {
397 struct nlattr *nest_parms;
398
399 if (!(ct->status & IPS_EXPECTED))
400 return 0;
401
402 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
403 if (!nest_parms)
404 goto nla_put_failure;
405 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
406 goto nla_put_failure;
407 nla_nest_end(skb, nest_parms);
408
409 return 0;
410
411 nla_put_failure:
412 return -1;
413 }
414
415 static int
dump_ct_seq_adj(struct sk_buff * skb,const struct nf_ct_seqadj * seq,int type)416 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
417 {
418 struct nlattr *nest_parms;
419
420 nest_parms = nla_nest_start(skb, type);
421 if (!nest_parms)
422 goto nla_put_failure;
423
424 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
425 htonl(seq->correction_pos)) ||
426 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
427 htonl(seq->offset_before)) ||
428 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
429 htonl(seq->offset_after)))
430 goto nla_put_failure;
431
432 nla_nest_end(skb, nest_parms);
433
434 return 0;
435
436 nla_put_failure:
437 return -1;
438 }
439
ctnetlink_dump_ct_seq_adj(struct sk_buff * skb,struct nf_conn * ct)440 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
441 {
442 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
443 struct nf_ct_seqadj *seq;
444
445 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
446 return 0;
447
448 spin_lock_bh(&ct->lock);
449 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
450 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
451 goto err;
452
453 seq = &seqadj->seq[IP_CT_DIR_REPLY];
454 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
455 goto err;
456
457 spin_unlock_bh(&ct->lock);
458 return 0;
459 err:
460 spin_unlock_bh(&ct->lock);
461 return -1;
462 }
463
ctnetlink_dump_ct_synproxy(struct sk_buff * skb,struct nf_conn * ct)464 static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
465 {
466 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
467 struct nlattr *nest_parms;
468
469 if (!synproxy)
470 return 0;
471
472 nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
473 if (!nest_parms)
474 goto nla_put_failure;
475
476 if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
477 nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
478 nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
479 goto nla_put_failure;
480
481 nla_nest_end(skb, nest_parms);
482
483 return 0;
484
485 nla_put_failure:
486 return -1;
487 }
488
ctnetlink_dump_id(struct sk_buff * skb,const struct nf_conn * ct)489 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
490 {
491 __be32 id = (__force __be32)nf_ct_get_id(ct);
492
493 if (nla_put_be32(skb, CTA_ID, id))
494 goto nla_put_failure;
495 return 0;
496
497 nla_put_failure:
498 return -1;
499 }
500
ctnetlink_dump_use(struct sk_buff * skb,const struct nf_conn * ct)501 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
502 {
503 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
504 goto nla_put_failure;
505 return 0;
506
507 nla_put_failure:
508 return -1;
509 }
510
511 /* all these functions access ct->ext. Caller must either hold a reference
512 * on ct or prevent its deletion by holding either the bucket spinlock or
513 * pcpu dying list lock.
514 */
ctnetlink_dump_extinfo(struct sk_buff * skb,struct nf_conn * ct,u32 type)515 static int ctnetlink_dump_extinfo(struct sk_buff *skb,
516 struct nf_conn *ct, u32 type)
517 {
518 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
519 ctnetlink_dump_timestamp(skb, ct) < 0 ||
520 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
521 ctnetlink_dump_labels(skb, ct) < 0 ||
522 ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
523 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
524 return -1;
525
526 return 0;
527 }
528
ctnetlink_dump_info(struct sk_buff * skb,struct nf_conn * ct)529 static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
530 {
531 if (ctnetlink_dump_status(skb, ct) < 0 ||
532 ctnetlink_dump_mark(skb, ct) < 0 ||
533 ctnetlink_dump_secctx(skb, ct) < 0 ||
534 ctnetlink_dump_id(skb, ct) < 0 ||
535 ctnetlink_dump_use(skb, ct) < 0 ||
536 ctnetlink_dump_master(skb, ct) < 0)
537 return -1;
538
539 if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
540 (ctnetlink_dump_timeout(skb, ct) < 0 ||
541 ctnetlink_dump_protoinfo(skb, ct) < 0))
542 return -1;
543
544 return 0;
545 }
546
547 static int
ctnetlink_fill_info(struct sk_buff * skb,u32 portid,u32 seq,u32 type,struct nf_conn * ct,bool extinfo,unsigned int flags)548 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
549 struct nf_conn *ct, bool extinfo, unsigned int flags)
550 {
551 const struct nf_conntrack_zone *zone;
552 struct nlmsghdr *nlh;
553 struct nfgenmsg *nfmsg;
554 struct nlattr *nest_parms;
555 unsigned int event;
556
557 if (portid)
558 flags |= NLM_F_MULTI;
559 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
560 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
561 if (nlh == NULL)
562 goto nlmsg_failure;
563
564 nfmsg = nlmsg_data(nlh);
565 nfmsg->nfgen_family = nf_ct_l3num(ct);
566 nfmsg->version = NFNETLINK_V0;
567 nfmsg->res_id = 0;
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 nfgenmsg *nfmsg;
712 struct nlattr *nest_parms;
713 struct nf_conn *ct = item->ct;
714 struct sk_buff *skb;
715 unsigned int type;
716 unsigned int flags = 0, group;
717 int err;
718
719 if (events & (1 << IPCT_DESTROY)) {
720 type = IPCTNL_MSG_CT_DELETE;
721 group = NFNLGRP_CONNTRACK_DESTROY;
722 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
723 type = IPCTNL_MSG_CT_NEW;
724 flags = NLM_F_CREATE|NLM_F_EXCL;
725 group = NFNLGRP_CONNTRACK_NEW;
726 } else if (events) {
727 type = IPCTNL_MSG_CT_NEW;
728 group = NFNLGRP_CONNTRACK_UPDATE;
729 } else
730 return 0;
731
732 net = nf_ct_net(ct);
733 if (!item->report && !nfnetlink_has_listeners(net, group))
734 return 0;
735
736 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
737 if (skb == NULL)
738 goto errout;
739
740 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
741 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
742 if (nlh == NULL)
743 goto nlmsg_failure;
744
745 nfmsg = nlmsg_data(nlh);
746 nfmsg->nfgen_family = nf_ct_l3num(ct);
747 nfmsg->version = NFNETLINK_V0;
748 nfmsg->res_id = 0;
749
750 zone = nf_ct_zone(ct);
751
752 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
753 if (!nest_parms)
754 goto nla_put_failure;
755 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
756 goto nla_put_failure;
757 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
758 NF_CT_ZONE_DIR_ORIG) < 0)
759 goto nla_put_failure;
760 nla_nest_end(skb, nest_parms);
761
762 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
763 if (!nest_parms)
764 goto nla_put_failure;
765 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
766 goto nla_put_failure;
767 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
768 NF_CT_ZONE_DIR_REPL) < 0)
769 goto nla_put_failure;
770 nla_nest_end(skb, nest_parms);
771
772 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
773 NF_CT_DEFAULT_ZONE_DIR) < 0)
774 goto nla_put_failure;
775
776 if (ctnetlink_dump_id(skb, ct) < 0)
777 goto nla_put_failure;
778
779 if (ctnetlink_dump_status(skb, ct) < 0)
780 goto nla_put_failure;
781
782 if (events & (1 << IPCT_DESTROY)) {
783 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
784 ctnetlink_dump_timestamp(skb, ct) < 0)
785 goto nla_put_failure;
786 } else {
787 if (ctnetlink_dump_timeout(skb, ct) < 0)
788 goto nla_put_failure;
789
790 if (events & (1 << IPCT_PROTOINFO)
791 && ctnetlink_dump_protoinfo(skb, ct) < 0)
792 goto nla_put_failure;
793
794 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
795 && ctnetlink_dump_helpinfo(skb, ct) < 0)
796 goto nla_put_failure;
797
798 #ifdef CONFIG_NF_CONNTRACK_SECMARK
799 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
800 && ctnetlink_dump_secctx(skb, ct) < 0)
801 goto nla_put_failure;
802 #endif
803 if (events & (1 << IPCT_LABEL) &&
804 ctnetlink_dump_labels(skb, ct) < 0)
805 goto nla_put_failure;
806
807 if (events & (1 << IPCT_RELATED) &&
808 ctnetlink_dump_master(skb, ct) < 0)
809 goto nla_put_failure;
810
811 if (events & (1 << IPCT_SEQADJ) &&
812 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
813 goto nla_put_failure;
814
815 if (events & (1 << IPCT_SYNPROXY) &&
816 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
817 goto nla_put_failure;
818 }
819
820 #ifdef CONFIG_NF_CONNTRACK_MARK
821 if ((events & (1 << IPCT_MARK) || ct->mark)
822 && ctnetlink_dump_mark(skb, ct) < 0)
823 goto nla_put_failure;
824 #endif
825 nlmsg_end(skb, nlh);
826 err = nfnetlink_send(skb, net, item->portid, group, item->report,
827 GFP_ATOMIC);
828 if (err == -ENOBUFS || err == -EAGAIN)
829 return -ENOBUFS;
830
831 return 0;
832
833 nla_put_failure:
834 nlmsg_cancel(skb, nlh);
835 nlmsg_failure:
836 kfree_skb(skb);
837 errout:
838 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
839 return -ENOBUFS;
840
841 return 0;
842 }
843 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
844
ctnetlink_done(struct netlink_callback * cb)845 static int ctnetlink_done(struct netlink_callback *cb)
846 {
847 if (cb->args[1])
848 nf_ct_put((struct nf_conn *)cb->args[1]);
849 kfree(cb->data);
850 return 0;
851 }
852
853 struct ctnetlink_filter {
854 u8 family;
855
856 u_int32_t orig_flags;
857 u_int32_t reply_flags;
858
859 struct nf_conntrack_tuple orig;
860 struct nf_conntrack_tuple reply;
861 struct nf_conntrack_zone zone;
862
863 struct {
864 u_int32_t val;
865 u_int32_t mask;
866 } mark;
867 };
868
869 static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
870 [CTA_FILTER_ORIG_FLAGS] = { .type = NLA_U32 },
871 [CTA_FILTER_REPLY_FLAGS] = { .type = NLA_U32 },
872 };
873
ctnetlink_parse_filter(const struct nlattr * attr,struct ctnetlink_filter * filter)874 static int ctnetlink_parse_filter(const struct nlattr *attr,
875 struct ctnetlink_filter *filter)
876 {
877 struct nlattr *tb[CTA_FILTER_MAX + 1];
878 int ret = 0;
879
880 ret = nla_parse_nested(tb, CTA_FILTER_MAX, attr, cta_filter_nla_policy,
881 NULL);
882 if (ret)
883 return ret;
884
885 if (tb[CTA_FILTER_ORIG_FLAGS]) {
886 filter->orig_flags = nla_get_u32(tb[CTA_FILTER_ORIG_FLAGS]);
887 if (filter->orig_flags & ~CTA_FILTER_F_ALL)
888 return -EOPNOTSUPP;
889 }
890
891 if (tb[CTA_FILTER_REPLY_FLAGS]) {
892 filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
893 if (filter->reply_flags & ~CTA_FILTER_F_ALL)
894 return -EOPNOTSUPP;
895 }
896
897 return 0;
898 }
899
900 static int ctnetlink_parse_zone(const struct nlattr *attr,
901 struct nf_conntrack_zone *zone);
902 static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
903 struct nf_conntrack_tuple *tuple,
904 u32 type, u_int8_t l3num,
905 struct nf_conntrack_zone *zone,
906 u_int32_t flags);
907
908 static struct ctnetlink_filter *
ctnetlink_alloc_filter(const struct nlattr * const cda[],u8 family)909 ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
910 {
911 struct ctnetlink_filter *filter;
912 int err;
913
914 #ifndef CONFIG_NF_CONNTRACK_MARK
915 if (cda[CTA_MARK] || cda[CTA_MARK_MASK])
916 return ERR_PTR(-EOPNOTSUPP);
917 #endif
918
919 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
920 if (filter == NULL)
921 return ERR_PTR(-ENOMEM);
922
923 filter->family = family;
924
925 #ifdef CONFIG_NF_CONNTRACK_MARK
926 if (cda[CTA_MARK]) {
927 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
928 if (cda[CTA_MARK_MASK])
929 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
930 else
931 filter->mark.mask = 0xffffffff;
932 } else if (cda[CTA_MARK_MASK]) {
933 err = -EINVAL;
934 goto err_filter;
935 }
936 #endif
937 if (!cda[CTA_FILTER])
938 return filter;
939
940 err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
941 if (err < 0)
942 goto err_filter;
943
944 err = ctnetlink_parse_filter(cda[CTA_FILTER], filter);
945 if (err < 0)
946 goto err_filter;
947
948 if (filter->orig_flags) {
949 if (!cda[CTA_TUPLE_ORIG]) {
950 err = -EINVAL;
951 goto err_filter;
952 }
953
954 err = ctnetlink_parse_tuple_filter(cda, &filter->orig,
955 CTA_TUPLE_ORIG,
956 filter->family,
957 &filter->zone,
958 filter->orig_flags);
959 if (err < 0)
960 goto err_filter;
961 }
962
963 if (filter->reply_flags) {
964 if (!cda[CTA_TUPLE_REPLY]) {
965 err = -EINVAL;
966 goto err_filter;
967 }
968
969 err = ctnetlink_parse_tuple_filter(cda, &filter->reply,
970 CTA_TUPLE_REPLY,
971 filter->family,
972 &filter->zone,
973 filter->orig_flags);
974 if (err < 0) {
975 err = -EINVAL;
976 goto err_filter;
977 }
978 }
979
980 return filter;
981
982 err_filter:
983 kfree(filter);
984
985 return ERR_PTR(err);
986 }
987
ctnetlink_needs_filter(u8 family,const struct nlattr * const * cda)988 static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
989 {
990 return family || cda[CTA_MARK] || cda[CTA_FILTER];
991 }
992
ctnetlink_start(struct netlink_callback * cb)993 static int ctnetlink_start(struct netlink_callback *cb)
994 {
995 const struct nlattr * const *cda = cb->data;
996 struct ctnetlink_filter *filter = NULL;
997 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
998 u8 family = nfmsg->nfgen_family;
999
1000 if (ctnetlink_needs_filter(family, cda)) {
1001 filter = ctnetlink_alloc_filter(cda, family);
1002 if (IS_ERR(filter))
1003 return PTR_ERR(filter);
1004 }
1005
1006 cb->data = filter;
1007 return 0;
1008 }
1009
ctnetlink_filter_match_tuple(struct nf_conntrack_tuple * filter_tuple,struct nf_conntrack_tuple * ct_tuple,u_int32_t flags,int family)1010 static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
1011 struct nf_conntrack_tuple *ct_tuple,
1012 u_int32_t flags, int family)
1013 {
1014 switch (family) {
1015 case NFPROTO_IPV4:
1016 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1017 filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
1018 return 0;
1019
1020 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1021 filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
1022 return 0;
1023 break;
1024 case NFPROTO_IPV6:
1025 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1026 !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
1027 &ct_tuple->src.u3.in6))
1028 return 0;
1029
1030 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1031 !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
1032 &ct_tuple->dst.u3.in6))
1033 return 0;
1034 break;
1035 }
1036
1037 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
1038 filter_tuple->dst.protonum != ct_tuple->dst.protonum)
1039 return 0;
1040
1041 switch (ct_tuple->dst.protonum) {
1042 case IPPROTO_TCP:
1043 case IPPROTO_UDP:
1044 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
1045 filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
1046 return 0;
1047
1048 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
1049 filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
1050 return 0;
1051 break;
1052 case IPPROTO_ICMP:
1053 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
1054 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1055 return 0;
1056 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
1057 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1058 return 0;
1059 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
1060 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1061 return 0;
1062 break;
1063 case IPPROTO_ICMPV6:
1064 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
1065 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1066 return 0;
1067 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
1068 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1069 return 0;
1070 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
1071 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1072 return 0;
1073 break;
1074 }
1075
1076 return 1;
1077 }
1078
ctnetlink_filter_match(struct nf_conn * ct,void * data)1079 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
1080 {
1081 struct ctnetlink_filter *filter = data;
1082 struct nf_conntrack_tuple *tuple;
1083
1084 if (filter == NULL)
1085 goto out;
1086
1087 /* Match entries of a given L3 protocol number.
1088 * If it is not specified, ie. l3proto == 0,
1089 * then match everything.
1090 */
1091 if (filter->family && nf_ct_l3num(ct) != filter->family)
1092 goto ignore_entry;
1093
1094 if (filter->orig_flags) {
1095 tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
1096 if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
1097 filter->orig_flags,
1098 filter->family))
1099 goto ignore_entry;
1100 }
1101
1102 if (filter->reply_flags) {
1103 tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
1104 if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
1105 filter->reply_flags,
1106 filter->family))
1107 goto ignore_entry;
1108 }
1109
1110 #ifdef CONFIG_NF_CONNTRACK_MARK
1111 if ((ct->mark & filter->mark.mask) != filter->mark.val)
1112 goto ignore_entry;
1113 #endif
1114
1115 out:
1116 return 1;
1117
1118 ignore_entry:
1119 return 0;
1120 }
1121
1122 static int
ctnetlink_dump_table(struct sk_buff * skb,struct netlink_callback * cb)1123 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1124 {
1125 unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
1126 struct net *net = sock_net(skb->sk);
1127 struct nf_conn *ct, *last;
1128 struct nf_conntrack_tuple_hash *h;
1129 struct hlist_nulls_node *n;
1130 struct nf_conn *nf_ct_evict[8];
1131 int res, i;
1132 spinlock_t *lockp;
1133
1134 last = (struct nf_conn *)cb->args[1];
1135 i = 0;
1136
1137 local_bh_disable();
1138 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
1139 restart:
1140 while (i) {
1141 i--;
1142 if (nf_ct_should_gc(nf_ct_evict[i]))
1143 nf_ct_kill(nf_ct_evict[i]);
1144 nf_ct_put(nf_ct_evict[i]);
1145 }
1146
1147 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
1148 nf_conntrack_lock(lockp);
1149 if (cb->args[0] >= nf_conntrack_htable_size) {
1150 spin_unlock(lockp);
1151 goto out;
1152 }
1153 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
1154 hnnode) {
1155 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
1156 continue;
1157 ct = nf_ct_tuplehash_to_ctrack(h);
1158 if (nf_ct_is_expired(ct)) {
1159 if (i < ARRAY_SIZE(nf_ct_evict) &&
1160 atomic_inc_not_zero(&ct->ct_general.use))
1161 nf_ct_evict[i++] = ct;
1162 continue;
1163 }
1164
1165 if (!net_eq(net, nf_ct_net(ct)))
1166 continue;
1167
1168 if (cb->args[1]) {
1169 if (ct != last)
1170 continue;
1171 cb->args[1] = 0;
1172 }
1173 if (!ctnetlink_filter_match(ct, cb->data))
1174 continue;
1175
1176 res =
1177 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1178 cb->nlh->nlmsg_seq,
1179 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1180 ct, true, flags);
1181 if (res < 0) {
1182 nf_conntrack_get(&ct->ct_general);
1183 cb->args[1] = (unsigned long)ct;
1184 spin_unlock(lockp);
1185 goto out;
1186 }
1187 }
1188 spin_unlock(lockp);
1189 if (cb->args[1]) {
1190 cb->args[1] = 0;
1191 goto restart;
1192 }
1193 }
1194 out:
1195 local_bh_enable();
1196 if (last) {
1197 /* nf ct hash resize happened, now clear the leftover. */
1198 if ((struct nf_conn *)cb->args[1] == last)
1199 cb->args[1] = 0;
1200
1201 nf_ct_put(last);
1202 }
1203
1204 while (i) {
1205 i--;
1206 if (nf_ct_should_gc(nf_ct_evict[i]))
1207 nf_ct_kill(nf_ct_evict[i]);
1208 nf_ct_put(nf_ct_evict[i]);
1209 }
1210
1211 return skb->len;
1212 }
1213
ipv4_nlattr_to_tuple(struct nlattr * tb[],struct nf_conntrack_tuple * t,u_int32_t flags)1214 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
1215 struct nf_conntrack_tuple *t,
1216 u_int32_t flags)
1217 {
1218 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1219 if (!tb[CTA_IP_V4_SRC])
1220 return -EINVAL;
1221
1222 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1223 }
1224
1225 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1226 if (!tb[CTA_IP_V4_DST])
1227 return -EINVAL;
1228
1229 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1230 }
1231
1232 return 0;
1233 }
1234
ipv6_nlattr_to_tuple(struct nlattr * tb[],struct nf_conntrack_tuple * t,u_int32_t flags)1235 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1236 struct nf_conntrack_tuple *t,
1237 u_int32_t flags)
1238 {
1239 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1240 if (!tb[CTA_IP_V6_SRC])
1241 return -EINVAL;
1242
1243 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1244 }
1245
1246 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1247 if (!tb[CTA_IP_V6_DST])
1248 return -EINVAL;
1249
1250 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1251 }
1252
1253 return 0;
1254 }
1255
ctnetlink_parse_tuple_ip(struct nlattr * attr,struct nf_conntrack_tuple * tuple,u_int32_t flags)1256 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1257 struct nf_conntrack_tuple *tuple,
1258 u_int32_t flags)
1259 {
1260 struct nlattr *tb[CTA_IP_MAX+1];
1261 int ret = 0;
1262
1263 ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
1264 if (ret < 0)
1265 return ret;
1266
1267 ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
1268 cta_ip_nla_policy, NULL);
1269 if (ret)
1270 return ret;
1271
1272 switch (tuple->src.l3num) {
1273 case NFPROTO_IPV4:
1274 ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
1275 break;
1276 case NFPROTO_IPV6:
1277 ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
1278 break;
1279 }
1280
1281 return ret;
1282 }
1283
1284 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1285 [CTA_PROTO_NUM] = { .type = NLA_U8 },
1286 };
1287
ctnetlink_parse_tuple_proto(struct nlattr * attr,struct nf_conntrack_tuple * tuple,u_int32_t flags)1288 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1289 struct nf_conntrack_tuple *tuple,
1290 u_int32_t flags)
1291 {
1292 const struct nf_conntrack_l4proto *l4proto;
1293 struct nlattr *tb[CTA_PROTO_MAX+1];
1294 int ret = 0;
1295
1296 ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1297 proto_nla_policy, NULL);
1298 if (ret < 0)
1299 return ret;
1300
1301 if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
1302 return 0;
1303
1304 if (!tb[CTA_PROTO_NUM])
1305 return -EINVAL;
1306
1307 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1308
1309 rcu_read_lock();
1310 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1311
1312 if (likely(l4proto->nlattr_to_tuple)) {
1313 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1314 l4proto->nla_policy,
1315 NULL);
1316 if (ret == 0)
1317 ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
1318 }
1319
1320 rcu_read_unlock();
1321
1322 return ret;
1323 }
1324
1325 static int
ctnetlink_parse_zone(const struct nlattr * attr,struct nf_conntrack_zone * zone)1326 ctnetlink_parse_zone(const struct nlattr *attr,
1327 struct nf_conntrack_zone *zone)
1328 {
1329 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1330 NF_CT_DEFAULT_ZONE_DIR, 0);
1331 #ifdef CONFIG_NF_CONNTRACK_ZONES
1332 if (attr)
1333 zone->id = ntohs(nla_get_be16(attr));
1334 #else
1335 if (attr)
1336 return -EOPNOTSUPP;
1337 #endif
1338 return 0;
1339 }
1340
1341 static int
ctnetlink_parse_tuple_zone(struct nlattr * attr,enum ctattr_type type,struct nf_conntrack_zone * zone)1342 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1343 struct nf_conntrack_zone *zone)
1344 {
1345 int ret;
1346
1347 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1348 return -EINVAL;
1349
1350 ret = ctnetlink_parse_zone(attr, zone);
1351 if (ret < 0)
1352 return ret;
1353
1354 if (type == CTA_TUPLE_REPLY)
1355 zone->dir = NF_CT_ZONE_DIR_REPL;
1356 else
1357 zone->dir = NF_CT_ZONE_DIR_ORIG;
1358
1359 return 0;
1360 }
1361
1362 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1363 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1364 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1365 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1366 };
1367
1368 #define CTA_FILTER_F_ALL_CTA_PROTO \
1369 (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
1370 CTA_FILTER_F_CTA_PROTO_DST_PORT | \
1371 CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
1372 CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
1373 CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
1374 CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
1375 CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
1376 CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
1377
1378 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)1379 ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
1380 struct nf_conntrack_tuple *tuple, u32 type,
1381 u_int8_t l3num, struct nf_conntrack_zone *zone,
1382 u_int32_t flags)
1383 {
1384 struct nlattr *tb[CTA_TUPLE_MAX+1];
1385 int err;
1386
1387 memset(tuple, 0, sizeof(*tuple));
1388
1389 err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1390 tuple_nla_policy, NULL);
1391 if (err < 0)
1392 return err;
1393
1394 if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1395 return -EOPNOTSUPP;
1396 tuple->src.l3num = l3num;
1397
1398 if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
1399 flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1400 if (!tb[CTA_TUPLE_IP])
1401 return -EINVAL;
1402
1403 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
1404 if (err < 0)
1405 return err;
1406 }
1407
1408 if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
1409 if (!tb[CTA_TUPLE_PROTO])
1410 return -EINVAL;
1411
1412 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
1413 if (err < 0)
1414 return err;
1415 } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
1416 /* Can't manage proto flags without a protonum */
1417 return -EINVAL;
1418 }
1419
1420 if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
1421 if (!zone)
1422 return -EINVAL;
1423
1424 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1425 type, zone);
1426 if (err < 0)
1427 return err;
1428 }
1429
1430 /* orig and expect tuples get DIR_ORIGINAL */
1431 if (type == CTA_TUPLE_REPLY)
1432 tuple->dst.dir = IP_CT_DIR_REPLY;
1433 else
1434 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1435
1436 return 0;
1437 }
1438
1439 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)1440 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1441 struct nf_conntrack_tuple *tuple, u32 type,
1442 u_int8_t l3num, struct nf_conntrack_zone *zone)
1443 {
1444 return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
1445 CTA_FILTER_FLAG(ALL));
1446 }
1447
1448 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1449 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1450 .len = NF_CT_HELPER_NAME_LEN - 1 },
1451 };
1452
ctnetlink_parse_help(const struct nlattr * attr,char ** helper_name,struct nlattr ** helpinfo)1453 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1454 struct nlattr **helpinfo)
1455 {
1456 int err;
1457 struct nlattr *tb[CTA_HELP_MAX+1];
1458
1459 err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1460 help_nla_policy, NULL);
1461 if (err < 0)
1462 return err;
1463
1464 if (!tb[CTA_HELP_NAME])
1465 return -EINVAL;
1466
1467 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1468
1469 if (tb[CTA_HELP_INFO])
1470 *helpinfo = tb[CTA_HELP_INFO];
1471
1472 return 0;
1473 }
1474
1475 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1476 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1477 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1478 [CTA_STATUS] = { .type = NLA_U32 },
1479 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1480 [CTA_HELP] = { .type = NLA_NESTED },
1481 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1482 [CTA_TIMEOUT] = { .type = NLA_U32 },
1483 [CTA_MARK] = { .type = NLA_U32 },
1484 [CTA_ID] = { .type = NLA_U32 },
1485 [CTA_NAT_DST] = { .type = NLA_NESTED },
1486 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1487 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1488 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1489 [CTA_ZONE] = { .type = NLA_U16 },
1490 [CTA_MARK_MASK] = { .type = NLA_U32 },
1491 [CTA_LABELS] = { .type = NLA_BINARY,
1492 .len = NF_CT_LABELS_MAX_SIZE },
1493 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1494 .len = NF_CT_LABELS_MAX_SIZE },
1495 [CTA_FILTER] = { .type = NLA_NESTED },
1496 };
1497
ctnetlink_flush_iterate(struct nf_conn * ct,void * data)1498 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1499 {
1500 if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1501 return 0;
1502
1503 return ctnetlink_filter_match(ct, data);
1504 }
1505
ctnetlink_flush_conntrack(struct net * net,const struct nlattr * const cda[],u32 portid,int report,u8 family)1506 static int ctnetlink_flush_conntrack(struct net *net,
1507 const struct nlattr * const cda[],
1508 u32 portid, int report, u8 family)
1509 {
1510 struct ctnetlink_filter *filter = NULL;
1511
1512 if (ctnetlink_needs_filter(family, cda)) {
1513 if (cda[CTA_FILTER])
1514 return -EOPNOTSUPP;
1515
1516 filter = ctnetlink_alloc_filter(cda, family);
1517 if (IS_ERR(filter))
1518 return PTR_ERR(filter);
1519 }
1520
1521 nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
1522 portid, report);
1523 kfree(filter);
1524
1525 return 0;
1526 }
1527
ctnetlink_del_conntrack(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[],struct netlink_ext_ack * extack)1528 static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1529 struct sk_buff *skb,
1530 const struct nlmsghdr *nlh,
1531 const struct nlattr * const cda[],
1532 struct netlink_ext_ack *extack)
1533 {
1534 struct nf_conntrack_tuple_hash *h;
1535 struct nf_conntrack_tuple tuple;
1536 struct nf_conn *ct;
1537 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1538 struct nf_conntrack_zone zone;
1539 int err;
1540
1541 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1542 if (err < 0)
1543 return err;
1544
1545 if (cda[CTA_TUPLE_ORIG])
1546 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1547 nfmsg->nfgen_family, &zone);
1548 else if (cda[CTA_TUPLE_REPLY])
1549 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1550 nfmsg->nfgen_family, &zone);
1551 else {
1552 u_int8_t u3 = nfmsg->version ? nfmsg->nfgen_family : AF_UNSPEC;
1553
1554 return ctnetlink_flush_conntrack(net, cda,
1555 NETLINK_CB(skb).portid,
1556 nlmsg_report(nlh), u3);
1557 }
1558
1559 if (err < 0)
1560 return err;
1561
1562 h = nf_conntrack_find_get(net, &zone, &tuple);
1563 if (!h)
1564 return -ENOENT;
1565
1566 ct = nf_ct_tuplehash_to_ctrack(h);
1567
1568 if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1569 nf_ct_put(ct);
1570 return -EBUSY;
1571 }
1572
1573 if (cda[CTA_ID]) {
1574 __be32 id = nla_get_be32(cda[CTA_ID]);
1575
1576 if (id != (__force __be32)nf_ct_get_id(ct)) {
1577 nf_ct_put(ct);
1578 return -ENOENT;
1579 }
1580 }
1581
1582 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1583 nf_ct_put(ct);
1584
1585 return 0;
1586 }
1587
ctnetlink_get_conntrack(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[],struct netlink_ext_ack * extack)1588 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1589 struct sk_buff *skb,
1590 const struct nlmsghdr *nlh,
1591 const struct nlattr * const cda[],
1592 struct netlink_ext_ack *extack)
1593 {
1594 struct nf_conntrack_tuple_hash *h;
1595 struct nf_conntrack_tuple tuple;
1596 struct nf_conn *ct;
1597 struct sk_buff *skb2 = NULL;
1598 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1599 u_int8_t u3 = nfmsg->nfgen_family;
1600 struct nf_conntrack_zone zone;
1601 int err;
1602
1603 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1604 struct netlink_dump_control c = {
1605 .start = ctnetlink_start,
1606 .dump = ctnetlink_dump_table,
1607 .done = ctnetlink_done,
1608 .data = (void *)cda,
1609 };
1610
1611 return netlink_dump_start(ctnl, skb, nlh, &c);
1612 }
1613
1614 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1615 if (err < 0)
1616 return err;
1617
1618 if (cda[CTA_TUPLE_ORIG])
1619 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1620 u3, &zone);
1621 else if (cda[CTA_TUPLE_REPLY])
1622 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1623 u3, &zone);
1624 else
1625 return -EINVAL;
1626
1627 if (err < 0)
1628 return err;
1629
1630 h = nf_conntrack_find_get(net, &zone, &tuple);
1631 if (!h)
1632 return -ENOENT;
1633
1634 ct = nf_ct_tuplehash_to_ctrack(h);
1635
1636 err = -ENOMEM;
1637 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1638 if (skb2 == NULL) {
1639 nf_ct_put(ct);
1640 return -ENOMEM;
1641 }
1642
1643 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1644 NFNL_MSG_TYPE(nlh->nlmsg_type), ct, true, 0);
1645 nf_ct_put(ct);
1646 if (err <= 0)
1647 goto free;
1648
1649 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1650 if (err < 0)
1651 goto out;
1652
1653 return 0;
1654
1655 free:
1656 kfree_skb(skb2);
1657 out:
1658 /* this avoids a loop in nfnetlink. */
1659 return err == -EAGAIN ? -ENOBUFS : err;
1660 }
1661
ctnetlink_done_list(struct netlink_callback * cb)1662 static int ctnetlink_done_list(struct netlink_callback *cb)
1663 {
1664 if (cb->args[1])
1665 nf_ct_put((struct nf_conn *)cb->args[1]);
1666 return 0;
1667 }
1668
1669 static int
ctnetlink_dump_list(struct sk_buff * skb,struct netlink_callback * cb,bool dying)1670 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1671 {
1672 struct nf_conn *ct, *last;
1673 struct nf_conntrack_tuple_hash *h;
1674 struct hlist_nulls_node *n;
1675 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1676 u_int8_t l3proto = nfmsg->nfgen_family;
1677 int res;
1678 int cpu;
1679 struct hlist_nulls_head *list;
1680 struct net *net = sock_net(skb->sk);
1681
1682 if (cb->args[2])
1683 return 0;
1684
1685 last = (struct nf_conn *)cb->args[1];
1686
1687 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1688 struct ct_pcpu *pcpu;
1689
1690 if (!cpu_possible(cpu))
1691 continue;
1692
1693 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1694 spin_lock_bh(&pcpu->lock);
1695 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1696 restart:
1697 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1698 ct = nf_ct_tuplehash_to_ctrack(h);
1699 if (l3proto && nf_ct_l3num(ct) != l3proto)
1700 continue;
1701 if (cb->args[1]) {
1702 if (ct != last)
1703 continue;
1704 cb->args[1] = 0;
1705 }
1706
1707 /* We can't dump extension info for the unconfirmed
1708 * list because unconfirmed conntracks can have
1709 * ct->ext reallocated (and thus freed).
1710 *
1711 * In the dying list case ct->ext can't be free'd
1712 * until after we drop pcpu->lock.
1713 */
1714 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1715 cb->nlh->nlmsg_seq,
1716 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1717 ct, dying ? true : false, 0);
1718 if (res < 0) {
1719 if (!atomic_inc_not_zero(&ct->ct_general.use))
1720 continue;
1721 cb->args[0] = cpu;
1722 cb->args[1] = (unsigned long)ct;
1723 spin_unlock_bh(&pcpu->lock);
1724 goto out;
1725 }
1726 }
1727 if (cb->args[1]) {
1728 cb->args[1] = 0;
1729 goto restart;
1730 }
1731 spin_unlock_bh(&pcpu->lock);
1732 }
1733 cb->args[2] = 1;
1734 out:
1735 if (last)
1736 nf_ct_put(last);
1737
1738 return skb->len;
1739 }
1740
1741 static int
ctnetlink_dump_dying(struct sk_buff * skb,struct netlink_callback * cb)1742 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1743 {
1744 return ctnetlink_dump_list(skb, cb, true);
1745 }
1746
ctnetlink_get_ct_dying(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[],struct netlink_ext_ack * extack)1747 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1748 struct sk_buff *skb,
1749 const struct nlmsghdr *nlh,
1750 const struct nlattr * const cda[],
1751 struct netlink_ext_ack *extack)
1752 {
1753 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1754 struct netlink_dump_control c = {
1755 .dump = ctnetlink_dump_dying,
1756 .done = ctnetlink_done_list,
1757 };
1758 return netlink_dump_start(ctnl, skb, nlh, &c);
1759 }
1760
1761 return -EOPNOTSUPP;
1762 }
1763
1764 static int
ctnetlink_dump_unconfirmed(struct sk_buff * skb,struct netlink_callback * cb)1765 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1766 {
1767 return ctnetlink_dump_list(skb, cb, false);
1768 }
1769
ctnetlink_get_ct_unconfirmed(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[],struct netlink_ext_ack * extack)1770 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1771 struct sk_buff *skb,
1772 const struct nlmsghdr *nlh,
1773 const struct nlattr * const cda[],
1774 struct netlink_ext_ack *extack)
1775 {
1776 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1777 struct netlink_dump_control c = {
1778 .dump = ctnetlink_dump_unconfirmed,
1779 .done = ctnetlink_done_list,
1780 };
1781 return netlink_dump_start(ctnl, skb, nlh, &c);
1782 }
1783
1784 return -EOPNOTSUPP;
1785 }
1786
1787 #if IS_ENABLED(CONFIG_NF_NAT)
1788 static int
ctnetlink_parse_nat_setup(struct nf_conn * ct,enum nf_nat_manip_type manip,const struct nlattr * attr)1789 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1790 enum nf_nat_manip_type manip,
1791 const struct nlattr *attr)
1792 __must_hold(RCU)
1793 {
1794 struct nf_nat_hook *nat_hook;
1795 int err;
1796
1797 nat_hook = rcu_dereference(nf_nat_hook);
1798 if (!nat_hook) {
1799 #ifdef CONFIG_MODULES
1800 rcu_read_unlock();
1801 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1802 if (request_module("nf-nat") < 0) {
1803 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1804 rcu_read_lock();
1805 return -EOPNOTSUPP;
1806 }
1807 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1808 rcu_read_lock();
1809 nat_hook = rcu_dereference(nf_nat_hook);
1810 if (nat_hook)
1811 return -EAGAIN;
1812 #endif
1813 return -EOPNOTSUPP;
1814 }
1815
1816 err = nat_hook->parse_nat_setup(ct, manip, attr);
1817 if (err == -EAGAIN) {
1818 #ifdef CONFIG_MODULES
1819 rcu_read_unlock();
1820 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1821 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1822 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1823 rcu_read_lock();
1824 return -EOPNOTSUPP;
1825 }
1826 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1827 rcu_read_lock();
1828 #else
1829 err = -EOPNOTSUPP;
1830 #endif
1831 }
1832 return err;
1833 }
1834 #endif
1835
1836 static void
__ctnetlink_change_status(struct nf_conn * ct,unsigned long on,unsigned long off)1837 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1838 unsigned long off)
1839 {
1840 unsigned int bit;
1841
1842 /* Ignore these unchangable bits */
1843 on &= ~IPS_UNCHANGEABLE_MASK;
1844 off &= ~IPS_UNCHANGEABLE_MASK;
1845
1846 for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1847 if (on & (1 << bit))
1848 set_bit(bit, &ct->status);
1849 else if (off & (1 << bit))
1850 clear_bit(bit, &ct->status);
1851 }
1852 }
1853
1854 static int
ctnetlink_change_status(struct nf_conn * ct,const struct nlattr * const cda[])1855 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1856 {
1857 unsigned long d;
1858 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1859 d = ct->status ^ status;
1860
1861 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1862 /* unchangeable */
1863 return -EBUSY;
1864
1865 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1866 /* SEEN_REPLY bit can only be set */
1867 return -EBUSY;
1868
1869 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1870 /* ASSURED bit can only be set */
1871 return -EBUSY;
1872
1873 __ctnetlink_change_status(ct, status, 0);
1874 return 0;
1875 }
1876
1877 static int
ctnetlink_setup_nat(struct nf_conn * ct,const struct nlattr * const cda[])1878 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1879 {
1880 #if IS_ENABLED(CONFIG_NF_NAT)
1881 int ret;
1882
1883 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1884 return 0;
1885
1886 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1887 cda[CTA_NAT_DST]);
1888 if (ret < 0)
1889 return ret;
1890
1891 return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1892 cda[CTA_NAT_SRC]);
1893 #else
1894 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1895 return 0;
1896 return -EOPNOTSUPP;
1897 #endif
1898 }
1899
ctnetlink_change_helper(struct nf_conn * ct,const struct nlattr * const cda[])1900 static int ctnetlink_change_helper(struct nf_conn *ct,
1901 const struct nlattr * const cda[])
1902 {
1903 struct nf_conntrack_helper *helper;
1904 struct nf_conn_help *help = nfct_help(ct);
1905 char *helpname = NULL;
1906 struct nlattr *helpinfo = NULL;
1907 int err;
1908
1909 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1910 if (err < 0)
1911 return err;
1912
1913 /* don't change helper of sibling connections */
1914 if (ct->master) {
1915 /* If we try to change the helper to the same thing twice,
1916 * treat the second attempt as a no-op instead of returning
1917 * an error.
1918 */
1919 err = -EBUSY;
1920 if (help) {
1921 rcu_read_lock();
1922 helper = rcu_dereference(help->helper);
1923 if (helper && !strcmp(helper->name, helpname))
1924 err = 0;
1925 rcu_read_unlock();
1926 }
1927
1928 return err;
1929 }
1930
1931 if (!strcmp(helpname, "")) {
1932 if (help && help->helper) {
1933 /* we had a helper before ... */
1934 nf_ct_remove_expectations(ct);
1935 RCU_INIT_POINTER(help->helper, NULL);
1936 }
1937
1938 return 0;
1939 }
1940
1941 rcu_read_lock();
1942 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1943 nf_ct_protonum(ct));
1944 if (helper == NULL) {
1945 rcu_read_unlock();
1946 return -EOPNOTSUPP;
1947 }
1948
1949 if (help) {
1950 if (help->helper == helper) {
1951 /* update private helper data if allowed. */
1952 if (helper->from_nlattr)
1953 helper->from_nlattr(helpinfo, ct);
1954 err = 0;
1955 } else
1956 err = -EBUSY;
1957 } else {
1958 /* we cannot set a helper for an existing conntrack */
1959 err = -EOPNOTSUPP;
1960 }
1961
1962 rcu_read_unlock();
1963 return err;
1964 }
1965
ctnetlink_change_timeout(struct nf_conn * ct,const struct nlattr * const cda[])1966 static int ctnetlink_change_timeout(struct nf_conn *ct,
1967 const struct nlattr * const cda[])
1968 {
1969 u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1970
1971 if (timeout > INT_MAX)
1972 timeout = INT_MAX;
1973 ct->timeout = nfct_time_stamp + (u32)timeout;
1974
1975 if (test_bit(IPS_DYING_BIT, &ct->status))
1976 return -ETIME;
1977
1978 return 0;
1979 }
1980
1981 #if defined(CONFIG_NF_CONNTRACK_MARK)
ctnetlink_change_mark(struct nf_conn * ct,const struct nlattr * const cda[])1982 static void ctnetlink_change_mark(struct nf_conn *ct,
1983 const struct nlattr * const cda[])
1984 {
1985 u32 mark, newmark, mask = 0;
1986
1987 if (cda[CTA_MARK_MASK])
1988 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1989
1990 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1991 newmark = (ct->mark & mask) ^ mark;
1992 if (newmark != ct->mark)
1993 ct->mark = newmark;
1994 }
1995 #endif
1996
1997 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1998 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1999 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
2000 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
2001 };
2002
ctnetlink_change_protoinfo(struct nf_conn * ct,const struct nlattr * const cda[])2003 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
2004 const struct nlattr * const cda[])
2005 {
2006 const struct nlattr *attr = cda[CTA_PROTOINFO];
2007 const struct nf_conntrack_l4proto *l4proto;
2008 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
2009 int err = 0;
2010
2011 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
2012 protoinfo_policy, NULL);
2013 if (err < 0)
2014 return err;
2015
2016 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
2017 if (l4proto->from_nlattr)
2018 err = l4proto->from_nlattr(tb, ct);
2019
2020 return err;
2021 }
2022
2023 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
2024 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
2025 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
2026 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
2027 };
2028
change_seq_adj(struct nf_ct_seqadj * seq,const struct nlattr * const attr)2029 static int change_seq_adj(struct nf_ct_seqadj *seq,
2030 const struct nlattr * const attr)
2031 {
2032 int err;
2033 struct nlattr *cda[CTA_SEQADJ_MAX+1];
2034
2035 err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
2036 seqadj_policy, NULL);
2037 if (err < 0)
2038 return err;
2039
2040 if (!cda[CTA_SEQADJ_CORRECTION_POS])
2041 return -EINVAL;
2042
2043 seq->correction_pos =
2044 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
2045
2046 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
2047 return -EINVAL;
2048
2049 seq->offset_before =
2050 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
2051
2052 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
2053 return -EINVAL;
2054
2055 seq->offset_after =
2056 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
2057
2058 return 0;
2059 }
2060
2061 static int
ctnetlink_change_seq_adj(struct nf_conn * ct,const struct nlattr * const cda[])2062 ctnetlink_change_seq_adj(struct nf_conn *ct,
2063 const struct nlattr * const cda[])
2064 {
2065 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
2066 int ret = 0;
2067
2068 if (!seqadj)
2069 return 0;
2070
2071 spin_lock_bh(&ct->lock);
2072 if (cda[CTA_SEQ_ADJ_ORIG]) {
2073 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
2074 cda[CTA_SEQ_ADJ_ORIG]);
2075 if (ret < 0)
2076 goto err;
2077
2078 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2079 }
2080
2081 if (cda[CTA_SEQ_ADJ_REPLY]) {
2082 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
2083 cda[CTA_SEQ_ADJ_REPLY]);
2084 if (ret < 0)
2085 goto err;
2086
2087 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2088 }
2089
2090 spin_unlock_bh(&ct->lock);
2091 return 0;
2092 err:
2093 spin_unlock_bh(&ct->lock);
2094 return ret;
2095 }
2096
2097 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
2098 [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
2099 [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
2100 [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
2101 };
2102
ctnetlink_change_synproxy(struct nf_conn * ct,const struct nlattr * const cda[])2103 static int ctnetlink_change_synproxy(struct nf_conn *ct,
2104 const struct nlattr * const cda[])
2105 {
2106 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
2107 struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
2108 int err;
2109
2110 if (!synproxy)
2111 return 0;
2112
2113 err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
2114 cda[CTA_SYNPROXY], synproxy_policy,
2115 NULL);
2116 if (err < 0)
2117 return err;
2118
2119 if (!tb[CTA_SYNPROXY_ISN] ||
2120 !tb[CTA_SYNPROXY_ITS] ||
2121 !tb[CTA_SYNPROXY_TSOFF])
2122 return -EINVAL;
2123
2124 synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
2125 synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
2126 synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
2127
2128 return 0;
2129 }
2130
2131 static int
ctnetlink_attach_labels(struct nf_conn * ct,const struct nlattr * const cda[])2132 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
2133 {
2134 #ifdef CONFIG_NF_CONNTRACK_LABELS
2135 size_t len = nla_len(cda[CTA_LABELS]);
2136 const void *mask = cda[CTA_LABELS_MASK];
2137
2138 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
2139 return -EINVAL;
2140
2141 if (mask) {
2142 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
2143 nla_len(cda[CTA_LABELS_MASK]) != len)
2144 return -EINVAL;
2145 mask = nla_data(cda[CTA_LABELS_MASK]);
2146 }
2147
2148 len /= sizeof(u32);
2149
2150 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
2151 #else
2152 return -EOPNOTSUPP;
2153 #endif
2154 }
2155
2156 static int
ctnetlink_change_conntrack(struct nf_conn * ct,const struct nlattr * const cda[])2157 ctnetlink_change_conntrack(struct nf_conn *ct,
2158 const struct nlattr * const cda[])
2159 {
2160 int err;
2161
2162 /* only allow NAT changes and master assignation for new conntracks */
2163 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
2164 return -EOPNOTSUPP;
2165
2166 if (cda[CTA_HELP]) {
2167 err = ctnetlink_change_helper(ct, cda);
2168 if (err < 0)
2169 return err;
2170 }
2171
2172 if (cda[CTA_TIMEOUT]) {
2173 err = ctnetlink_change_timeout(ct, cda);
2174 if (err < 0)
2175 return err;
2176 }
2177
2178 if (cda[CTA_STATUS]) {
2179 err = ctnetlink_change_status(ct, cda);
2180 if (err < 0)
2181 return err;
2182 }
2183
2184 if (cda[CTA_PROTOINFO]) {
2185 err = ctnetlink_change_protoinfo(ct, cda);
2186 if (err < 0)
2187 return err;
2188 }
2189
2190 #if defined(CONFIG_NF_CONNTRACK_MARK)
2191 if (cda[CTA_MARK])
2192 ctnetlink_change_mark(ct, cda);
2193 #endif
2194
2195 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2196 err = ctnetlink_change_seq_adj(ct, cda);
2197 if (err < 0)
2198 return err;
2199 }
2200
2201 if (cda[CTA_SYNPROXY]) {
2202 err = ctnetlink_change_synproxy(ct, cda);
2203 if (err < 0)
2204 return err;
2205 }
2206
2207 if (cda[CTA_LABELS]) {
2208 err = ctnetlink_attach_labels(ct, cda);
2209 if (err < 0)
2210 return err;
2211 }
2212
2213 return 0;
2214 }
2215
2216 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)2217 ctnetlink_create_conntrack(struct net *net,
2218 const struct nf_conntrack_zone *zone,
2219 const struct nlattr * const cda[],
2220 struct nf_conntrack_tuple *otuple,
2221 struct nf_conntrack_tuple *rtuple,
2222 u8 u3)
2223 {
2224 struct nf_conn *ct;
2225 int err = -EINVAL;
2226 struct nf_conntrack_helper *helper;
2227 struct nf_conn_tstamp *tstamp;
2228 u64 timeout;
2229
2230 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
2231 if (IS_ERR(ct))
2232 return ERR_PTR(-ENOMEM);
2233
2234 if (!cda[CTA_TIMEOUT])
2235 goto err1;
2236
2237 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2238 if (timeout > INT_MAX)
2239 timeout = INT_MAX;
2240 ct->timeout = (u32)timeout + nfct_time_stamp;
2241
2242 rcu_read_lock();
2243 if (cda[CTA_HELP]) {
2244 char *helpname = NULL;
2245 struct nlattr *helpinfo = NULL;
2246
2247 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
2248 if (err < 0)
2249 goto err2;
2250
2251 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2252 nf_ct_protonum(ct));
2253 if (helper == NULL) {
2254 rcu_read_unlock();
2255 #ifdef CONFIG_MODULES
2256 if (request_module("nfct-helper-%s", helpname) < 0) {
2257 err = -EOPNOTSUPP;
2258 goto err1;
2259 }
2260
2261 rcu_read_lock();
2262 helper = __nf_conntrack_helper_find(helpname,
2263 nf_ct_l3num(ct),
2264 nf_ct_protonum(ct));
2265 if (helper) {
2266 err = -EAGAIN;
2267 goto err2;
2268 }
2269 rcu_read_unlock();
2270 #endif
2271 err = -EOPNOTSUPP;
2272 goto err1;
2273 } else {
2274 struct nf_conn_help *help;
2275
2276 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2277 if (help == NULL) {
2278 err = -ENOMEM;
2279 goto err2;
2280 }
2281 /* set private helper data if allowed. */
2282 if (helper->from_nlattr)
2283 helper->from_nlattr(helpinfo, ct);
2284
2285 /* not in hash table yet so not strictly necessary */
2286 RCU_INIT_POINTER(help->helper, helper);
2287 }
2288 } else {
2289 /* try an implicit helper assignation */
2290 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
2291 if (err < 0)
2292 goto err2;
2293 }
2294
2295 err = ctnetlink_setup_nat(ct, cda);
2296 if (err < 0)
2297 goto err2;
2298
2299 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2300 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2301 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2302 nf_ct_labels_ext_add(ct);
2303 nfct_seqadj_ext_add(ct);
2304 nfct_synproxy_ext_add(ct);
2305
2306 /* we must add conntrack extensions before confirmation. */
2307 ct->status |= IPS_CONFIRMED;
2308
2309 if (cda[CTA_STATUS]) {
2310 err = ctnetlink_change_status(ct, cda);
2311 if (err < 0)
2312 goto err2;
2313 }
2314
2315 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2316 err = ctnetlink_change_seq_adj(ct, cda);
2317 if (err < 0)
2318 goto err2;
2319 }
2320
2321 memset(&ct->proto, 0, sizeof(ct->proto));
2322 if (cda[CTA_PROTOINFO]) {
2323 err = ctnetlink_change_protoinfo(ct, cda);
2324 if (err < 0)
2325 goto err2;
2326 }
2327
2328 if (cda[CTA_SYNPROXY]) {
2329 err = ctnetlink_change_synproxy(ct, cda);
2330 if (err < 0)
2331 goto err2;
2332 }
2333
2334 #if defined(CONFIG_NF_CONNTRACK_MARK)
2335 if (cda[CTA_MARK])
2336 ctnetlink_change_mark(ct, cda);
2337 #endif
2338
2339 /* setup master conntrack: this is a confirmed expectation */
2340 if (cda[CTA_TUPLE_MASTER]) {
2341 struct nf_conntrack_tuple master;
2342 struct nf_conntrack_tuple_hash *master_h;
2343 struct nf_conn *master_ct;
2344
2345 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2346 u3, NULL);
2347 if (err < 0)
2348 goto err2;
2349
2350 master_h = nf_conntrack_find_get(net, zone, &master);
2351 if (master_h == NULL) {
2352 err = -ENOENT;
2353 goto err2;
2354 }
2355 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2356 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2357 ct->master = master_ct;
2358 }
2359 tstamp = nf_conn_tstamp_find(ct);
2360 if (tstamp)
2361 tstamp->start = ktime_get_real_ns();
2362
2363 err = nf_conntrack_hash_check_insert(ct);
2364 if (err < 0)
2365 goto err2;
2366
2367 rcu_read_unlock();
2368
2369 return ct;
2370
2371 err2:
2372 rcu_read_unlock();
2373 err1:
2374 nf_conntrack_free(ct);
2375 return ERR_PTR(err);
2376 }
2377
ctnetlink_new_conntrack(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[],struct netlink_ext_ack * extack)2378 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
2379 struct sk_buff *skb,
2380 const struct nlmsghdr *nlh,
2381 const struct nlattr * const cda[],
2382 struct netlink_ext_ack *extack)
2383 {
2384 struct nf_conntrack_tuple otuple, rtuple;
2385 struct nf_conntrack_tuple_hash *h = NULL;
2386 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2387 struct nf_conn *ct;
2388 u_int8_t u3 = nfmsg->nfgen_family;
2389 struct nf_conntrack_zone zone;
2390 int err;
2391
2392 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2393 if (err < 0)
2394 return err;
2395
2396 if (cda[CTA_TUPLE_ORIG]) {
2397 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2398 u3, &zone);
2399 if (err < 0)
2400 return err;
2401 }
2402
2403 if (cda[CTA_TUPLE_REPLY]) {
2404 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2405 u3, &zone);
2406 if (err < 0)
2407 return err;
2408 }
2409
2410 if (cda[CTA_TUPLE_ORIG])
2411 h = nf_conntrack_find_get(net, &zone, &otuple);
2412 else if (cda[CTA_TUPLE_REPLY])
2413 h = nf_conntrack_find_get(net, &zone, &rtuple);
2414
2415 if (h == NULL) {
2416 err = -ENOENT;
2417 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2418 enum ip_conntrack_events events;
2419
2420 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2421 return -EINVAL;
2422 if (otuple.dst.protonum != rtuple.dst.protonum)
2423 return -EINVAL;
2424
2425 ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
2426 &rtuple, u3);
2427 if (IS_ERR(ct))
2428 return PTR_ERR(ct);
2429
2430 err = 0;
2431 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2432 events = 1 << IPCT_RELATED;
2433 else
2434 events = 1 << IPCT_NEW;
2435
2436 if (cda[CTA_LABELS] &&
2437 ctnetlink_attach_labels(ct, cda) == 0)
2438 events |= (1 << IPCT_LABEL);
2439
2440 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2441 (1 << IPCT_ASSURED) |
2442 (1 << IPCT_HELPER) |
2443 (1 << IPCT_PROTOINFO) |
2444 (1 << IPCT_SEQADJ) |
2445 (1 << IPCT_MARK) |
2446 (1 << IPCT_SYNPROXY) |
2447 events,
2448 ct, NETLINK_CB(skb).portid,
2449 nlmsg_report(nlh));
2450 nf_ct_put(ct);
2451 }
2452
2453 return err;
2454 }
2455 /* implicit 'else' */
2456
2457 err = -EEXIST;
2458 ct = nf_ct_tuplehash_to_ctrack(h);
2459 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
2460 err = ctnetlink_change_conntrack(ct, cda);
2461 if (err == 0) {
2462 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2463 (1 << IPCT_ASSURED) |
2464 (1 << IPCT_HELPER) |
2465 (1 << IPCT_LABEL) |
2466 (1 << IPCT_PROTOINFO) |
2467 (1 << IPCT_SEQADJ) |
2468 (1 << IPCT_MARK) |
2469 (1 << IPCT_SYNPROXY),
2470 ct, NETLINK_CB(skb).portid,
2471 nlmsg_report(nlh));
2472 }
2473 }
2474
2475 nf_ct_put(ct);
2476 return err;
2477 }
2478
2479 static int
ctnetlink_ct_stat_cpu_fill_info(struct sk_buff * skb,u32 portid,u32 seq,__u16 cpu,const struct ip_conntrack_stat * st)2480 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2481 __u16 cpu, const struct ip_conntrack_stat *st)
2482 {
2483 struct nlmsghdr *nlh;
2484 struct nfgenmsg *nfmsg;
2485 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2486
2487 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2488 IPCTNL_MSG_CT_GET_STATS_CPU);
2489 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2490 if (nlh == NULL)
2491 goto nlmsg_failure;
2492
2493 nfmsg = nlmsg_data(nlh);
2494 nfmsg->nfgen_family = AF_UNSPEC;
2495 nfmsg->version = NFNETLINK_V0;
2496 nfmsg->res_id = htons(cpu);
2497
2498 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2499 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2500 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2501 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2502 htonl(st->insert_failed)) ||
2503 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2504 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2505 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2506 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2507 htonl(st->search_restart)) ||
2508 nla_put_be32(skb, CTA_STATS_CLASH_RESOLVE,
2509 htonl(st->clash_resolve)))
2510 goto nla_put_failure;
2511
2512 nlmsg_end(skb, nlh);
2513 return skb->len;
2514
2515 nla_put_failure:
2516 nlmsg_failure:
2517 nlmsg_cancel(skb, nlh);
2518 return -1;
2519 }
2520
2521 static int
ctnetlink_ct_stat_cpu_dump(struct sk_buff * skb,struct netlink_callback * cb)2522 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2523 {
2524 int cpu;
2525 struct net *net = sock_net(skb->sk);
2526
2527 if (cb->args[0] == nr_cpu_ids)
2528 return 0;
2529
2530 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2531 const struct ip_conntrack_stat *st;
2532
2533 if (!cpu_possible(cpu))
2534 continue;
2535
2536 st = per_cpu_ptr(net->ct.stat, cpu);
2537 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2538 NETLINK_CB(cb->skb).portid,
2539 cb->nlh->nlmsg_seq,
2540 cpu, st) < 0)
2541 break;
2542 }
2543 cb->args[0] = cpu;
2544
2545 return skb->len;
2546 }
2547
ctnetlink_stat_ct_cpu(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[],struct netlink_ext_ack * extack)2548 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2549 struct sk_buff *skb,
2550 const struct nlmsghdr *nlh,
2551 const struct nlattr * const cda[],
2552 struct netlink_ext_ack *extack)
2553 {
2554 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2555 struct netlink_dump_control c = {
2556 .dump = ctnetlink_ct_stat_cpu_dump,
2557 };
2558 return netlink_dump_start(ctnl, skb, nlh, &c);
2559 }
2560
2561 return 0;
2562 }
2563
2564 static int
ctnetlink_stat_ct_fill_info(struct sk_buff * skb,u32 portid,u32 seq,u32 type,struct net * net)2565 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2566 struct net *net)
2567 {
2568 struct nlmsghdr *nlh;
2569 struct nfgenmsg *nfmsg;
2570 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2571 unsigned int nr_conntracks = atomic_read(&net->ct.count);
2572
2573 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2574 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2575 if (nlh == NULL)
2576 goto nlmsg_failure;
2577
2578 nfmsg = nlmsg_data(nlh);
2579 nfmsg->nfgen_family = AF_UNSPEC;
2580 nfmsg->version = NFNETLINK_V0;
2581 nfmsg->res_id = 0;
2582
2583 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2584 goto nla_put_failure;
2585
2586 if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2587 goto nla_put_failure;
2588
2589 nlmsg_end(skb, nlh);
2590 return skb->len;
2591
2592 nla_put_failure:
2593 nlmsg_failure:
2594 nlmsg_cancel(skb, nlh);
2595 return -1;
2596 }
2597
ctnetlink_stat_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)2598 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2599 struct sk_buff *skb, const struct nlmsghdr *nlh,
2600 const struct nlattr * const cda[],
2601 struct netlink_ext_ack *extack)
2602 {
2603 struct sk_buff *skb2;
2604 int err;
2605
2606 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2607 if (skb2 == NULL)
2608 return -ENOMEM;
2609
2610 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2611 nlh->nlmsg_seq,
2612 NFNL_MSG_TYPE(nlh->nlmsg_type),
2613 sock_net(skb->sk));
2614 if (err <= 0)
2615 goto free;
2616
2617 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2618 if (err < 0)
2619 goto out;
2620
2621 return 0;
2622
2623 free:
2624 kfree_skb(skb2);
2625 out:
2626 /* this avoids a loop in nfnetlink. */
2627 return err == -EAGAIN ? -ENOBUFS : err;
2628 }
2629
2630 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2631 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2632 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2633 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2634 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2635 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2636 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2637 .len = NF_CT_HELPER_NAME_LEN - 1 },
2638 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2639 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2640 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2641 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2642 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2643 };
2644
2645 static struct nf_conntrack_expect *
2646 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2647 struct nf_conntrack_helper *helper,
2648 struct nf_conntrack_tuple *tuple,
2649 struct nf_conntrack_tuple *mask);
2650
2651 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2652 static size_t
ctnetlink_glue_build_size(const struct nf_conn * ct)2653 ctnetlink_glue_build_size(const struct nf_conn *ct)
2654 {
2655 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2656 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2657 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2658 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2659 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2660 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2661 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2662 + nla_total_size(0) /* CTA_PROTOINFO */
2663 + nla_total_size(0) /* CTA_HELP */
2664 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2665 + ctnetlink_secctx_size(ct)
2666 #if IS_ENABLED(CONFIG_NF_NAT)
2667 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2668 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2669 #endif
2670 #ifdef CONFIG_NF_CONNTRACK_MARK
2671 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2672 #endif
2673 #ifdef CONFIG_NF_CONNTRACK_ZONES
2674 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2675 #endif
2676 + ctnetlink_proto_size(ct)
2677 ;
2678 }
2679
ctnetlink_glue_get_ct(const struct sk_buff * skb,enum ip_conntrack_info * ctinfo)2680 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2681 enum ip_conntrack_info *ctinfo)
2682 {
2683 return nf_ct_get(skb, ctinfo);
2684 }
2685
__ctnetlink_glue_build(struct sk_buff * skb,struct nf_conn * ct)2686 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2687 {
2688 const struct nf_conntrack_zone *zone;
2689 struct nlattr *nest_parms;
2690
2691 zone = nf_ct_zone(ct);
2692
2693 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2694 if (!nest_parms)
2695 goto nla_put_failure;
2696 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2697 goto nla_put_failure;
2698 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2699 NF_CT_ZONE_DIR_ORIG) < 0)
2700 goto nla_put_failure;
2701 nla_nest_end(skb, nest_parms);
2702
2703 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2704 if (!nest_parms)
2705 goto nla_put_failure;
2706 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2707 goto nla_put_failure;
2708 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2709 NF_CT_ZONE_DIR_REPL) < 0)
2710 goto nla_put_failure;
2711 nla_nest_end(skb, nest_parms);
2712
2713 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2714 NF_CT_DEFAULT_ZONE_DIR) < 0)
2715 goto nla_put_failure;
2716
2717 if (ctnetlink_dump_id(skb, ct) < 0)
2718 goto nla_put_failure;
2719
2720 if (ctnetlink_dump_status(skb, ct) < 0)
2721 goto nla_put_failure;
2722
2723 if (ctnetlink_dump_timeout(skb, ct) < 0)
2724 goto nla_put_failure;
2725
2726 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2727 goto nla_put_failure;
2728
2729 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2730 goto nla_put_failure;
2731
2732 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2733 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2734 goto nla_put_failure;
2735 #endif
2736 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2737 goto nla_put_failure;
2738
2739 if ((ct->status & IPS_SEQ_ADJUST) &&
2740 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2741 goto nla_put_failure;
2742
2743 if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2744 goto nla_put_failure;
2745
2746 #ifdef CONFIG_NF_CONNTRACK_MARK
2747 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2748 goto nla_put_failure;
2749 #endif
2750 if (ctnetlink_dump_labels(skb, ct) < 0)
2751 goto nla_put_failure;
2752 return 0;
2753
2754 nla_put_failure:
2755 return -ENOSPC;
2756 }
2757
2758 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)2759 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2760 enum ip_conntrack_info ctinfo,
2761 u_int16_t ct_attr, u_int16_t ct_info_attr)
2762 {
2763 struct nlattr *nest_parms;
2764
2765 nest_parms = nla_nest_start(skb, ct_attr);
2766 if (!nest_parms)
2767 goto nla_put_failure;
2768
2769 if (__ctnetlink_glue_build(skb, ct) < 0)
2770 goto nla_put_failure;
2771
2772 nla_nest_end(skb, nest_parms);
2773
2774 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2775 goto nla_put_failure;
2776
2777 return 0;
2778
2779 nla_put_failure:
2780 return -ENOSPC;
2781 }
2782
2783 static int
ctnetlink_update_status(struct nf_conn * ct,const struct nlattr * const cda[])2784 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2785 {
2786 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2787 unsigned long d = ct->status ^ status;
2788
2789 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2790 /* SEEN_REPLY bit can only be set */
2791 return -EBUSY;
2792
2793 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2794 /* ASSURED bit can only be set */
2795 return -EBUSY;
2796
2797 /* This check is less strict than ctnetlink_change_status()
2798 * because callers often flip IPS_EXPECTED bits when sending
2799 * an NFQA_CT attribute to the kernel. So ignore the
2800 * unchangeable bits but do not error out. Also user programs
2801 * are allowed to clear the bits that they are allowed to change.
2802 */
2803 __ctnetlink_change_status(ct, status, ~status);
2804 return 0;
2805 }
2806
2807 static int
ctnetlink_glue_parse_ct(const struct nlattr * cda[],struct nf_conn * ct)2808 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2809 {
2810 int err;
2811
2812 if (cda[CTA_TIMEOUT]) {
2813 err = ctnetlink_change_timeout(ct, cda);
2814 if (err < 0)
2815 return err;
2816 }
2817 if (cda[CTA_STATUS]) {
2818 err = ctnetlink_update_status(ct, cda);
2819 if (err < 0)
2820 return err;
2821 }
2822 if (cda[CTA_HELP]) {
2823 err = ctnetlink_change_helper(ct, cda);
2824 if (err < 0)
2825 return err;
2826 }
2827 if (cda[CTA_LABELS]) {
2828 err = ctnetlink_attach_labels(ct, cda);
2829 if (err < 0)
2830 return err;
2831 }
2832 #if defined(CONFIG_NF_CONNTRACK_MARK)
2833 if (cda[CTA_MARK]) {
2834 ctnetlink_change_mark(ct, cda);
2835 }
2836 #endif
2837 return 0;
2838 }
2839
2840 static int
ctnetlink_glue_parse(const struct nlattr * attr,struct nf_conn * ct)2841 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2842 {
2843 struct nlattr *cda[CTA_MAX+1];
2844 int ret;
2845
2846 ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2847 NULL);
2848 if (ret < 0)
2849 return ret;
2850
2851 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2852 }
2853
ctnetlink_glue_exp_parse(const struct nlattr * const * cda,const struct nf_conn * ct,struct nf_conntrack_tuple * tuple,struct nf_conntrack_tuple * mask)2854 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2855 const struct nf_conn *ct,
2856 struct nf_conntrack_tuple *tuple,
2857 struct nf_conntrack_tuple *mask)
2858 {
2859 int err;
2860
2861 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2862 nf_ct_l3num(ct), NULL);
2863 if (err < 0)
2864 return err;
2865
2866 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2867 nf_ct_l3num(ct), NULL);
2868 }
2869
2870 static int
ctnetlink_glue_attach_expect(const struct nlattr * attr,struct nf_conn * ct,u32 portid,u32 report)2871 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2872 u32 portid, u32 report)
2873 {
2874 struct nlattr *cda[CTA_EXPECT_MAX+1];
2875 struct nf_conntrack_tuple tuple, mask;
2876 struct nf_conntrack_helper *helper = NULL;
2877 struct nf_conntrack_expect *exp;
2878 int err;
2879
2880 err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2881 exp_nla_policy, NULL);
2882 if (err < 0)
2883 return err;
2884
2885 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2886 ct, &tuple, &mask);
2887 if (err < 0)
2888 return err;
2889
2890 if (cda[CTA_EXPECT_HELP_NAME]) {
2891 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2892
2893 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2894 nf_ct_protonum(ct));
2895 if (helper == NULL)
2896 return -EOPNOTSUPP;
2897 }
2898
2899 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2900 helper, &tuple, &mask);
2901 if (IS_ERR(exp))
2902 return PTR_ERR(exp);
2903
2904 err = nf_ct_expect_related_report(exp, portid, report, 0);
2905 nf_ct_expect_put(exp);
2906 return err;
2907 }
2908
ctnetlink_glue_seqadj(struct sk_buff * skb,struct nf_conn * ct,enum ip_conntrack_info ctinfo,int diff)2909 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2910 enum ip_conntrack_info ctinfo, int diff)
2911 {
2912 if (!(ct->status & IPS_NAT_MASK))
2913 return;
2914
2915 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2916 }
2917
2918 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2919 .get_ct = ctnetlink_glue_get_ct,
2920 .build_size = ctnetlink_glue_build_size,
2921 .build = ctnetlink_glue_build,
2922 .parse = ctnetlink_glue_parse,
2923 .attach_expect = ctnetlink_glue_attach_expect,
2924 .seq_adjust = ctnetlink_glue_seqadj,
2925 };
2926 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2927
2928 /***********************************************************************
2929 * EXPECT
2930 ***********************************************************************/
2931
ctnetlink_exp_dump_tuple(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple,u32 type)2932 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2933 const struct nf_conntrack_tuple *tuple,
2934 u32 type)
2935 {
2936 struct nlattr *nest_parms;
2937
2938 nest_parms = nla_nest_start(skb, type);
2939 if (!nest_parms)
2940 goto nla_put_failure;
2941 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2942 goto nla_put_failure;
2943 nla_nest_end(skb, nest_parms);
2944
2945 return 0;
2946
2947 nla_put_failure:
2948 return -1;
2949 }
2950
ctnetlink_exp_dump_mask(struct sk_buff * skb,const struct nf_conntrack_tuple * tuple,const struct nf_conntrack_tuple_mask * mask)2951 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2952 const struct nf_conntrack_tuple *tuple,
2953 const struct nf_conntrack_tuple_mask *mask)
2954 {
2955 const struct nf_conntrack_l4proto *l4proto;
2956 struct nf_conntrack_tuple m;
2957 struct nlattr *nest_parms;
2958 int ret;
2959
2960 memset(&m, 0xFF, sizeof(m));
2961 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2962 m.src.u.all = mask->src.u.all;
2963 m.dst.protonum = tuple->dst.protonum;
2964
2965 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2966 if (!nest_parms)
2967 goto nla_put_failure;
2968
2969 rcu_read_lock();
2970 ret = ctnetlink_dump_tuples_ip(skb, &m);
2971 if (ret >= 0) {
2972 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2973 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2974 }
2975 rcu_read_unlock();
2976
2977 if (unlikely(ret < 0))
2978 goto nla_put_failure;
2979
2980 nla_nest_end(skb, nest_parms);
2981
2982 return 0;
2983
2984 nla_put_failure:
2985 return -1;
2986 }
2987
2988 static const union nf_inet_addr any_addr;
2989
nf_expect_get_id(const struct nf_conntrack_expect * exp)2990 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2991 {
2992 static __read_mostly siphash_key_t exp_id_seed;
2993 unsigned long a, b, c, d;
2994
2995 net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
2996
2997 a = (unsigned long)exp;
2998 b = (unsigned long)exp->helper;
2999 c = (unsigned long)exp->master;
3000 d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
3001
3002 #ifdef CONFIG_64BIT
3003 return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
3004 #else
3005 return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
3006 #endif
3007 }
3008
3009 static int
ctnetlink_exp_dump_expect(struct sk_buff * skb,const struct nf_conntrack_expect * exp)3010 ctnetlink_exp_dump_expect(struct sk_buff *skb,
3011 const struct nf_conntrack_expect *exp)
3012 {
3013 struct nf_conn *master = exp->master;
3014 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
3015 struct nf_conn_help *help;
3016 #if IS_ENABLED(CONFIG_NF_NAT)
3017 struct nlattr *nest_parms;
3018 struct nf_conntrack_tuple nat_tuple = {};
3019 #endif
3020 struct nf_ct_helper_expectfn *expfn;
3021
3022 if (timeout < 0)
3023 timeout = 0;
3024
3025 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
3026 goto nla_put_failure;
3027 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
3028 goto nla_put_failure;
3029 if (ctnetlink_exp_dump_tuple(skb,
3030 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
3031 CTA_EXPECT_MASTER) < 0)
3032 goto nla_put_failure;
3033
3034 #if IS_ENABLED(CONFIG_NF_NAT)
3035 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
3036 exp->saved_proto.all) {
3037 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
3038 if (!nest_parms)
3039 goto nla_put_failure;
3040
3041 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
3042 goto nla_put_failure;
3043
3044 nat_tuple.src.l3num = nf_ct_l3num(master);
3045 nat_tuple.src.u3 = exp->saved_addr;
3046 nat_tuple.dst.protonum = nf_ct_protonum(master);
3047 nat_tuple.src.u = exp->saved_proto;
3048
3049 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
3050 CTA_EXPECT_NAT_TUPLE) < 0)
3051 goto nla_put_failure;
3052 nla_nest_end(skb, nest_parms);
3053 }
3054 #endif
3055 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
3056 nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
3057 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
3058 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
3059 goto nla_put_failure;
3060 help = nfct_help(master);
3061 if (help) {
3062 struct nf_conntrack_helper *helper;
3063
3064 helper = rcu_dereference(help->helper);
3065 if (helper &&
3066 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
3067 goto nla_put_failure;
3068 }
3069 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
3070 if (expfn != NULL &&
3071 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
3072 goto nla_put_failure;
3073
3074 return 0;
3075
3076 nla_put_failure:
3077 return -1;
3078 }
3079
3080 static int
ctnetlink_exp_fill_info(struct sk_buff * skb,u32 portid,u32 seq,int event,const struct nf_conntrack_expect * exp)3081 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
3082 int event, const struct nf_conntrack_expect *exp)
3083 {
3084 struct nlmsghdr *nlh;
3085 struct nfgenmsg *nfmsg;
3086 unsigned int flags = portid ? NLM_F_MULTI : 0;
3087
3088 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
3089 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3090 if (nlh == NULL)
3091 goto nlmsg_failure;
3092
3093 nfmsg = nlmsg_data(nlh);
3094 nfmsg->nfgen_family = exp->tuple.src.l3num;
3095 nfmsg->version = NFNETLINK_V0;
3096 nfmsg->res_id = 0;
3097
3098 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3099 goto nla_put_failure;
3100
3101 nlmsg_end(skb, nlh);
3102 return skb->len;
3103
3104 nlmsg_failure:
3105 nla_put_failure:
3106 nlmsg_cancel(skb, nlh);
3107 return -1;
3108 }
3109
3110 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3111 static int
ctnetlink_expect_event(unsigned int events,struct nf_exp_event * item)3112 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
3113 {
3114 struct nf_conntrack_expect *exp = item->exp;
3115 struct net *net = nf_ct_exp_net(exp);
3116 struct nlmsghdr *nlh;
3117 struct nfgenmsg *nfmsg;
3118 struct sk_buff *skb;
3119 unsigned int type, group;
3120 int flags = 0;
3121
3122 if (events & (1 << IPEXP_DESTROY)) {
3123 type = IPCTNL_MSG_EXP_DELETE;
3124 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
3125 } else if (events & (1 << IPEXP_NEW)) {
3126 type = IPCTNL_MSG_EXP_NEW;
3127 flags = NLM_F_CREATE|NLM_F_EXCL;
3128 group = NFNLGRP_CONNTRACK_EXP_NEW;
3129 } else
3130 return 0;
3131
3132 if (!item->report && !nfnetlink_has_listeners(net, group))
3133 return 0;
3134
3135 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
3136 if (skb == NULL)
3137 goto errout;
3138
3139 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
3140 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
3141 if (nlh == NULL)
3142 goto nlmsg_failure;
3143
3144 nfmsg = nlmsg_data(nlh);
3145 nfmsg->nfgen_family = exp->tuple.src.l3num;
3146 nfmsg->version = NFNETLINK_V0;
3147 nfmsg->res_id = 0;
3148
3149 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3150 goto nla_put_failure;
3151
3152 nlmsg_end(skb, nlh);
3153 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
3154 return 0;
3155
3156 nla_put_failure:
3157 nlmsg_cancel(skb, nlh);
3158 nlmsg_failure:
3159 kfree_skb(skb);
3160 errout:
3161 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
3162 return 0;
3163 }
3164 #endif
ctnetlink_exp_done(struct netlink_callback * cb)3165 static int ctnetlink_exp_done(struct netlink_callback *cb)
3166 {
3167 if (cb->args[1])
3168 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
3169 return 0;
3170 }
3171
3172 static int
ctnetlink_exp_dump_table(struct sk_buff * skb,struct netlink_callback * cb)3173 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3174 {
3175 struct net *net = sock_net(skb->sk);
3176 struct nf_conntrack_expect *exp, *last;
3177 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3178 u_int8_t l3proto = nfmsg->nfgen_family;
3179
3180 rcu_read_lock();
3181 last = (struct nf_conntrack_expect *)cb->args[1];
3182 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
3183 restart:
3184 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
3185 hnode) {
3186 if (l3proto && exp->tuple.src.l3num != l3proto)
3187 continue;
3188
3189 if (!net_eq(nf_ct_net(exp->master), net))
3190 continue;
3191
3192 if (cb->args[1]) {
3193 if (exp != last)
3194 continue;
3195 cb->args[1] = 0;
3196 }
3197 if (ctnetlink_exp_fill_info(skb,
3198 NETLINK_CB(cb->skb).portid,
3199 cb->nlh->nlmsg_seq,
3200 IPCTNL_MSG_EXP_NEW,
3201 exp) < 0) {
3202 if (!refcount_inc_not_zero(&exp->use))
3203 continue;
3204 cb->args[1] = (unsigned long)exp;
3205 goto out;
3206 }
3207 }
3208 if (cb->args[1]) {
3209 cb->args[1] = 0;
3210 goto restart;
3211 }
3212 }
3213 out:
3214 rcu_read_unlock();
3215 if (last)
3216 nf_ct_expect_put(last);
3217
3218 return skb->len;
3219 }
3220
3221 static int
ctnetlink_exp_ct_dump_table(struct sk_buff * skb,struct netlink_callback * cb)3222 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3223 {
3224 struct nf_conntrack_expect *exp, *last;
3225 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3226 struct nf_conn *ct = cb->data;
3227 struct nf_conn_help *help = nfct_help(ct);
3228 u_int8_t l3proto = nfmsg->nfgen_family;
3229
3230 if (cb->args[0])
3231 return 0;
3232
3233 rcu_read_lock();
3234 last = (struct nf_conntrack_expect *)cb->args[1];
3235 restart:
3236 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
3237 if (l3proto && exp->tuple.src.l3num != l3proto)
3238 continue;
3239 if (cb->args[1]) {
3240 if (exp != last)
3241 continue;
3242 cb->args[1] = 0;
3243 }
3244 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
3245 cb->nlh->nlmsg_seq,
3246 IPCTNL_MSG_EXP_NEW,
3247 exp) < 0) {
3248 if (!refcount_inc_not_zero(&exp->use))
3249 continue;
3250 cb->args[1] = (unsigned long)exp;
3251 goto out;
3252 }
3253 }
3254 if (cb->args[1]) {
3255 cb->args[1] = 0;
3256 goto restart;
3257 }
3258 cb->args[0] = 1;
3259 out:
3260 rcu_read_unlock();
3261 if (last)
3262 nf_ct_expect_put(last);
3263
3264 return skb->len;
3265 }
3266
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)3267 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
3268 struct sk_buff *skb,
3269 const struct nlmsghdr *nlh,
3270 const struct nlattr * const cda[],
3271 struct netlink_ext_ack *extack)
3272 {
3273 int err;
3274 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3275 u_int8_t u3 = nfmsg->nfgen_family;
3276 struct nf_conntrack_tuple tuple;
3277 struct nf_conntrack_tuple_hash *h;
3278 struct nf_conn *ct;
3279 struct nf_conntrack_zone zone;
3280 struct netlink_dump_control c = {
3281 .dump = ctnetlink_exp_ct_dump_table,
3282 .done = ctnetlink_exp_done,
3283 };
3284
3285 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3286 u3, NULL);
3287 if (err < 0)
3288 return err;
3289
3290 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3291 if (err < 0)
3292 return err;
3293
3294 h = nf_conntrack_find_get(net, &zone, &tuple);
3295 if (!h)
3296 return -ENOENT;
3297
3298 ct = nf_ct_tuplehash_to_ctrack(h);
3299 /* No expectation linked to this connection tracking. */
3300 if (!nfct_help(ct)) {
3301 nf_ct_put(ct);
3302 return 0;
3303 }
3304
3305 c.data = ct;
3306
3307 err = netlink_dump_start(ctnl, skb, nlh, &c);
3308 nf_ct_put(ct);
3309
3310 return err;
3311 }
3312
ctnetlink_get_expect(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[],struct netlink_ext_ack * extack)3313 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
3314 struct sk_buff *skb, const struct nlmsghdr *nlh,
3315 const struct nlattr * const cda[],
3316 struct netlink_ext_ack *extack)
3317 {
3318 struct nf_conntrack_tuple tuple;
3319 struct nf_conntrack_expect *exp;
3320 struct sk_buff *skb2;
3321 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3322 u_int8_t u3 = nfmsg->nfgen_family;
3323 struct nf_conntrack_zone zone;
3324 int err;
3325
3326 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3327 if (cda[CTA_EXPECT_MASTER])
3328 return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda,
3329 extack);
3330 else {
3331 struct netlink_dump_control c = {
3332 .dump = ctnetlink_exp_dump_table,
3333 .done = ctnetlink_exp_done,
3334 };
3335 return netlink_dump_start(ctnl, skb, nlh, &c);
3336 }
3337 }
3338
3339 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3340 if (err < 0)
3341 return err;
3342
3343 if (cda[CTA_EXPECT_TUPLE])
3344 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3345 u3, NULL);
3346 else if (cda[CTA_EXPECT_MASTER])
3347 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3348 u3, NULL);
3349 else
3350 return -EINVAL;
3351
3352 if (err < 0)
3353 return err;
3354
3355 exp = nf_ct_expect_find_get(net, &zone, &tuple);
3356 if (!exp)
3357 return -ENOENT;
3358
3359 if (cda[CTA_EXPECT_ID]) {
3360 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3361
3362 if (id != nf_expect_get_id(exp)) {
3363 nf_ct_expect_put(exp);
3364 return -ENOENT;
3365 }
3366 }
3367
3368 err = -ENOMEM;
3369 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3370 if (skb2 == NULL) {
3371 nf_ct_expect_put(exp);
3372 goto out;
3373 }
3374
3375 rcu_read_lock();
3376 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3377 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
3378 rcu_read_unlock();
3379 nf_ct_expect_put(exp);
3380 if (err <= 0)
3381 goto free;
3382
3383 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
3384 if (err < 0)
3385 goto out;
3386
3387 return 0;
3388
3389 free:
3390 kfree_skb(skb2);
3391 out:
3392 /* this avoids a loop in nfnetlink. */
3393 return err == -EAGAIN ? -ENOBUFS : err;
3394 }
3395
expect_iter_name(struct nf_conntrack_expect * exp,void * data)3396 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3397 {
3398 const struct nf_conn_help *m_help;
3399 const char *name = data;
3400
3401 m_help = nfct_help(exp->master);
3402
3403 return strcmp(m_help->helper->name, name) == 0;
3404 }
3405
expect_iter_all(struct nf_conntrack_expect * exp,void * data)3406 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3407 {
3408 return true;
3409 }
3410
ctnetlink_del_expect(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[],struct netlink_ext_ack * extack)3411 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
3412 struct sk_buff *skb, const struct nlmsghdr *nlh,
3413 const struct nlattr * const cda[],
3414 struct netlink_ext_ack *extack)
3415 {
3416 struct nf_conntrack_expect *exp;
3417 struct nf_conntrack_tuple tuple;
3418 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3419 u_int8_t u3 = nfmsg->nfgen_family;
3420 struct nf_conntrack_zone zone;
3421 int err;
3422
3423 if (cda[CTA_EXPECT_TUPLE]) {
3424 /* delete a single expect by tuple */
3425 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3426 if (err < 0)
3427 return err;
3428
3429 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3430 u3, NULL);
3431 if (err < 0)
3432 return err;
3433
3434 /* bump usage count to 2 */
3435 exp = nf_ct_expect_find_get(net, &zone, &tuple);
3436 if (!exp)
3437 return -ENOENT;
3438
3439 if (cda[CTA_EXPECT_ID]) {
3440 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3441 if (ntohl(id) != (u32)(unsigned long)exp) {
3442 nf_ct_expect_put(exp);
3443 return -ENOENT;
3444 }
3445 }
3446
3447 /* after list removal, usage count == 1 */
3448 spin_lock_bh(&nf_conntrack_expect_lock);
3449 if (del_timer(&exp->timeout)) {
3450 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3451 nlmsg_report(nlh));
3452 nf_ct_expect_put(exp);
3453 }
3454 spin_unlock_bh(&nf_conntrack_expect_lock);
3455 /* have to put what we 'get' above.
3456 * after this line usage count == 0 */
3457 nf_ct_expect_put(exp);
3458 } else if (cda[CTA_EXPECT_HELP_NAME]) {
3459 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3460
3461 nf_ct_expect_iterate_net(net, expect_iter_name, name,
3462 NETLINK_CB(skb).portid,
3463 nlmsg_report(nlh));
3464 } else {
3465 /* This basically means we have to flush everything*/
3466 nf_ct_expect_iterate_net(net, expect_iter_all, NULL,
3467 NETLINK_CB(skb).portid,
3468 nlmsg_report(nlh));
3469 }
3470
3471 return 0;
3472 }
3473 static int
ctnetlink_change_expect(struct nf_conntrack_expect * x,const struct nlattr * const cda[])3474 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3475 const struct nlattr * const cda[])
3476 {
3477 if (cda[CTA_EXPECT_TIMEOUT]) {
3478 if (!del_timer(&x->timeout))
3479 return -ETIME;
3480
3481 x->timeout.expires = jiffies +
3482 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3483 add_timer(&x->timeout);
3484 }
3485 return 0;
3486 }
3487
3488 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3489 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3490 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3491 };
3492
3493 static int
ctnetlink_parse_expect_nat(const struct nlattr * attr,struct nf_conntrack_expect * exp,u_int8_t u3)3494 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3495 struct nf_conntrack_expect *exp,
3496 u_int8_t u3)
3497 {
3498 #if IS_ENABLED(CONFIG_NF_NAT)
3499 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3500 struct nf_conntrack_tuple nat_tuple = {};
3501 int err;
3502
3503 err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3504 exp_nat_nla_policy, NULL);
3505 if (err < 0)
3506 return err;
3507
3508 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3509 return -EINVAL;
3510
3511 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3512 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3513 u3, NULL);
3514 if (err < 0)
3515 return err;
3516
3517 exp->saved_addr = nat_tuple.src.u3;
3518 exp->saved_proto = nat_tuple.src.u;
3519 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3520
3521 return 0;
3522 #else
3523 return -EOPNOTSUPP;
3524 #endif
3525 }
3526
3527 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)3528 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3529 struct nf_conntrack_helper *helper,
3530 struct nf_conntrack_tuple *tuple,
3531 struct nf_conntrack_tuple *mask)
3532 {
3533 u_int32_t class = 0;
3534 struct nf_conntrack_expect *exp;
3535 struct nf_conn_help *help;
3536 int err;
3537
3538 help = nfct_help(ct);
3539 if (!help)
3540 return ERR_PTR(-EOPNOTSUPP);
3541
3542 if (cda[CTA_EXPECT_CLASS] && helper) {
3543 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3544 if (class > helper->expect_class_max)
3545 return ERR_PTR(-EINVAL);
3546 }
3547 exp = nf_ct_expect_alloc(ct);
3548 if (!exp)
3549 return ERR_PTR(-ENOMEM);
3550
3551 if (cda[CTA_EXPECT_FLAGS]) {
3552 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3553 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3554 } else {
3555 exp->flags = 0;
3556 }
3557 if (cda[CTA_EXPECT_FN]) {
3558 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3559 struct nf_ct_helper_expectfn *expfn;
3560
3561 expfn = nf_ct_helper_expectfn_find_by_name(name);
3562 if (expfn == NULL) {
3563 err = -EINVAL;
3564 goto err_out;
3565 }
3566 exp->expectfn = expfn->expectfn;
3567 } else
3568 exp->expectfn = NULL;
3569
3570 exp->class = class;
3571 exp->master = ct;
3572 exp->helper = helper;
3573 exp->tuple = *tuple;
3574 exp->mask.src.u3 = mask->src.u3;
3575 exp->mask.src.u.all = mask->src.u.all;
3576
3577 if (cda[CTA_EXPECT_NAT]) {
3578 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3579 exp, nf_ct_l3num(ct));
3580 if (err < 0)
3581 goto err_out;
3582 }
3583 return exp;
3584 err_out:
3585 nf_ct_expect_put(exp);
3586 return ERR_PTR(err);
3587 }
3588
3589 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)3590 ctnetlink_create_expect(struct net *net,
3591 const struct nf_conntrack_zone *zone,
3592 const struct nlattr * const cda[],
3593 u_int8_t u3, u32 portid, int report)
3594 {
3595 struct nf_conntrack_tuple tuple, mask, master_tuple;
3596 struct nf_conntrack_tuple_hash *h = NULL;
3597 struct nf_conntrack_helper *helper = NULL;
3598 struct nf_conntrack_expect *exp;
3599 struct nf_conn *ct;
3600 int err;
3601
3602 /* caller guarantees that those three CTA_EXPECT_* exist */
3603 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3604 u3, NULL);
3605 if (err < 0)
3606 return err;
3607 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3608 u3, NULL);
3609 if (err < 0)
3610 return err;
3611 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3612 u3, NULL);
3613 if (err < 0)
3614 return err;
3615
3616 /* Look for master conntrack of this expectation */
3617 h = nf_conntrack_find_get(net, zone, &master_tuple);
3618 if (!h)
3619 return -ENOENT;
3620 ct = nf_ct_tuplehash_to_ctrack(h);
3621
3622 rcu_read_lock();
3623 if (cda[CTA_EXPECT_HELP_NAME]) {
3624 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3625
3626 helper = __nf_conntrack_helper_find(helpname, u3,
3627 nf_ct_protonum(ct));
3628 if (helper == NULL) {
3629 rcu_read_unlock();
3630 #ifdef CONFIG_MODULES
3631 if (request_module("nfct-helper-%s", helpname) < 0) {
3632 err = -EOPNOTSUPP;
3633 goto err_ct;
3634 }
3635 rcu_read_lock();
3636 helper = __nf_conntrack_helper_find(helpname, u3,
3637 nf_ct_protonum(ct));
3638 if (helper) {
3639 err = -EAGAIN;
3640 goto err_rcu;
3641 }
3642 rcu_read_unlock();
3643 #endif
3644 err = -EOPNOTSUPP;
3645 goto err_ct;
3646 }
3647 }
3648
3649 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3650 if (IS_ERR(exp)) {
3651 err = PTR_ERR(exp);
3652 goto err_rcu;
3653 }
3654
3655 err = nf_ct_expect_related_report(exp, portid, report, 0);
3656 nf_ct_expect_put(exp);
3657 err_rcu:
3658 rcu_read_unlock();
3659 err_ct:
3660 nf_ct_put(ct);
3661 return err;
3662 }
3663
ctnetlink_new_expect(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[],struct netlink_ext_ack * extack)3664 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3665 struct sk_buff *skb, const struct nlmsghdr *nlh,
3666 const struct nlattr * const cda[],
3667 struct netlink_ext_ack *extack)
3668 {
3669 struct nf_conntrack_tuple tuple;
3670 struct nf_conntrack_expect *exp;
3671 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3672 u_int8_t u3 = nfmsg->nfgen_family;
3673 struct nf_conntrack_zone zone;
3674 int err;
3675
3676 if (!cda[CTA_EXPECT_TUPLE]
3677 || !cda[CTA_EXPECT_MASK]
3678 || !cda[CTA_EXPECT_MASTER])
3679 return -EINVAL;
3680
3681 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3682 if (err < 0)
3683 return err;
3684
3685 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3686 u3, NULL);
3687 if (err < 0)
3688 return err;
3689
3690 spin_lock_bh(&nf_conntrack_expect_lock);
3691 exp = __nf_ct_expect_find(net, &zone, &tuple);
3692 if (!exp) {
3693 spin_unlock_bh(&nf_conntrack_expect_lock);
3694 err = -ENOENT;
3695 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3696 err = ctnetlink_create_expect(net, &zone, cda, u3,
3697 NETLINK_CB(skb).portid,
3698 nlmsg_report(nlh));
3699 }
3700 return err;
3701 }
3702
3703 err = -EEXIST;
3704 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3705 err = ctnetlink_change_expect(exp, cda);
3706 spin_unlock_bh(&nf_conntrack_expect_lock);
3707
3708 return err;
3709 }
3710
3711 static int
ctnetlink_exp_stat_fill_info(struct sk_buff * skb,u32 portid,u32 seq,int cpu,const struct ip_conntrack_stat * st)3712 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3713 const struct ip_conntrack_stat *st)
3714 {
3715 struct nlmsghdr *nlh;
3716 struct nfgenmsg *nfmsg;
3717 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3718
3719 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3720 IPCTNL_MSG_EXP_GET_STATS_CPU);
3721 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3722 if (nlh == NULL)
3723 goto nlmsg_failure;
3724
3725 nfmsg = nlmsg_data(nlh);
3726 nfmsg->nfgen_family = AF_UNSPEC;
3727 nfmsg->version = NFNETLINK_V0;
3728 nfmsg->res_id = htons(cpu);
3729
3730 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3731 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3732 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3733 goto nla_put_failure;
3734
3735 nlmsg_end(skb, nlh);
3736 return skb->len;
3737
3738 nla_put_failure:
3739 nlmsg_failure:
3740 nlmsg_cancel(skb, nlh);
3741 return -1;
3742 }
3743
3744 static int
ctnetlink_exp_stat_cpu_dump(struct sk_buff * skb,struct netlink_callback * cb)3745 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3746 {
3747 int cpu;
3748 struct net *net = sock_net(skb->sk);
3749
3750 if (cb->args[0] == nr_cpu_ids)
3751 return 0;
3752
3753 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3754 const struct ip_conntrack_stat *st;
3755
3756 if (!cpu_possible(cpu))
3757 continue;
3758
3759 st = per_cpu_ptr(net->ct.stat, cpu);
3760 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3761 cb->nlh->nlmsg_seq,
3762 cpu, st) < 0)
3763 break;
3764 }
3765 cb->args[0] = cpu;
3766
3767 return skb->len;
3768 }
3769
ctnetlink_stat_exp_cpu(struct net * net,struct sock * ctnl,struct sk_buff * skb,const struct nlmsghdr * nlh,const struct nlattr * const cda[],struct netlink_ext_ack * extack)3770 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3771 struct sk_buff *skb,
3772 const struct nlmsghdr *nlh,
3773 const struct nlattr * const cda[],
3774 struct netlink_ext_ack *extack)
3775 {
3776 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3777 struct netlink_dump_control c = {
3778 .dump = ctnetlink_exp_stat_cpu_dump,
3779 };
3780 return netlink_dump_start(ctnl, skb, nlh, &c);
3781 }
3782
3783 return 0;
3784 }
3785
3786 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3787 static struct nf_ct_event_notifier ctnl_notifier = {
3788 .fcn = ctnetlink_conntrack_event,
3789 };
3790
3791 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3792 .fcn = ctnetlink_expect_event,
3793 };
3794 #endif
3795
3796 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3797 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3798 .attr_count = CTA_MAX,
3799 .policy = ct_nla_policy },
3800 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3801 .attr_count = CTA_MAX,
3802 .policy = ct_nla_policy },
3803 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3804 .attr_count = CTA_MAX,
3805 .policy = ct_nla_policy },
3806 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3807 .attr_count = CTA_MAX,
3808 .policy = ct_nla_policy },
3809 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3810 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3811 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3812 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3813 };
3814
3815 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3816 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3817 .attr_count = CTA_EXPECT_MAX,
3818 .policy = exp_nla_policy },
3819 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3820 .attr_count = CTA_EXPECT_MAX,
3821 .policy = exp_nla_policy },
3822 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3823 .attr_count = CTA_EXPECT_MAX,
3824 .policy = exp_nla_policy },
3825 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3826 };
3827
3828 static const struct nfnetlink_subsystem ctnl_subsys = {
3829 .name = "conntrack",
3830 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3831 .cb_count = IPCTNL_MSG_MAX,
3832 .cb = ctnl_cb,
3833 };
3834
3835 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3836 .name = "conntrack_expect",
3837 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3838 .cb_count = IPCTNL_MSG_EXP_MAX,
3839 .cb = ctnl_exp_cb,
3840 };
3841
3842 MODULE_ALIAS("ip_conntrack_netlink");
3843 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3844 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3845
ctnetlink_net_init(struct net * net)3846 static int __net_init ctnetlink_net_init(struct net *net)
3847 {
3848 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3849 int ret;
3850
3851 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3852 if (ret < 0) {
3853 pr_err("ctnetlink_init: cannot register notifier.\n");
3854 goto err_out;
3855 }
3856
3857 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3858 if (ret < 0) {
3859 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3860 goto err_unreg_notifier;
3861 }
3862 #endif
3863 return 0;
3864
3865 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3866 err_unreg_notifier:
3867 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3868 err_out:
3869 return ret;
3870 #endif
3871 }
3872
ctnetlink_net_exit(struct net * net)3873 static void ctnetlink_net_exit(struct net *net)
3874 {
3875 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3876 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3877 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3878 #endif
3879 }
3880
ctnetlink_net_exit_batch(struct list_head * net_exit_list)3881 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3882 {
3883 struct net *net;
3884
3885 list_for_each_entry(net, net_exit_list, exit_list)
3886 ctnetlink_net_exit(net);
3887
3888 /* wait for other cpus until they are done with ctnl_notifiers */
3889 synchronize_rcu();
3890 }
3891
3892 static struct pernet_operations ctnetlink_net_ops = {
3893 .init = ctnetlink_net_init,
3894 .exit_batch = ctnetlink_net_exit_batch,
3895 };
3896
ctnetlink_init(void)3897 static int __init ctnetlink_init(void)
3898 {
3899 int ret;
3900
3901 ret = nfnetlink_subsys_register(&ctnl_subsys);
3902 if (ret < 0) {
3903 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3904 goto err_out;
3905 }
3906
3907 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3908 if (ret < 0) {
3909 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3910 goto err_unreg_subsys;
3911 }
3912
3913 ret = register_pernet_subsys(&ctnetlink_net_ops);
3914 if (ret < 0) {
3915 pr_err("ctnetlink_init: cannot register pernet operations\n");
3916 goto err_unreg_exp_subsys;
3917 }
3918 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3919 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3920 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3921 #endif
3922 return 0;
3923
3924 err_unreg_exp_subsys:
3925 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3926 err_unreg_subsys:
3927 nfnetlink_subsys_unregister(&ctnl_subsys);
3928 err_out:
3929 return ret;
3930 }
3931
ctnetlink_exit(void)3932 static void __exit ctnetlink_exit(void)
3933 {
3934 unregister_pernet_subsys(&ctnetlink_net_ops);
3935 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3936 nfnetlink_subsys_unregister(&ctnl_subsys);
3937 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3938 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3939 #endif
3940 synchronize_rcu();
3941 }
3942
3943 module_init(ctnetlink_init);
3944 module_exit(ctnetlink_exit);
3945