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[mirror_ubuntu-focal-kernel.git] / net / netfilter / nf_conntrack_netlink.c
1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/security.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
32
33 #include <linux/netfilter.h>
34 #include <net/netlink.h>
35 #include <net/sock.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_core.h>
38 #include <net/netfilter/nf_conntrack_expect.h>
39 #include <net/netfilter/nf_conntrack_helper.h>
40 #include <net/netfilter/nf_conntrack_seqadj.h>
41 #include <net/netfilter/nf_conntrack_l3proto.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_seqadj.h>
49 #include <net/netfilter/nf_conntrack_synproxy.h>
50 #ifdef CONFIG_NF_NAT_NEEDED
51 #include <net/netfilter/nf_nat_core.h>
52 #include <net/netfilter/nf_nat_l4proto.h>
53 #include <net/netfilter/nf_nat_helper.h>
54 #endif
55
56 #include <linux/netfilter/nfnetlink.h>
57 #include <linux/netfilter/nfnetlink_conntrack.h>
58
59 MODULE_LICENSE("GPL");
60
61 static char __initdata version[] = "0.93";
62
63 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
64 const struct nf_conntrack_tuple *tuple,
65 const struct nf_conntrack_l4proto *l4proto)
66 {
67 int ret = 0;
68 struct nlattr *nest_parms;
69
70 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
71 if (!nest_parms)
72 goto nla_put_failure;
73 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
74 goto nla_put_failure;
75
76 if (likely(l4proto->tuple_to_nlattr))
77 ret = l4proto->tuple_to_nlattr(skb, tuple);
78
79 nla_nest_end(skb, nest_parms);
80
81 return ret;
82
83 nla_put_failure:
84 return -1;
85 }
86
87 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
88 const struct nf_conntrack_tuple *tuple,
89 const struct nf_conntrack_l3proto *l3proto)
90 {
91 int ret = 0;
92 struct nlattr *nest_parms;
93
94 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
95 if (!nest_parms)
96 goto nla_put_failure;
97
98 if (likely(l3proto->tuple_to_nlattr))
99 ret = l3proto->tuple_to_nlattr(skb, tuple);
100
101 nla_nest_end(skb, nest_parms);
102
103 return ret;
104
105 nla_put_failure:
106 return -1;
107 }
108
109 static int ctnetlink_dump_tuples(struct sk_buff *skb,
110 const struct nf_conntrack_tuple *tuple)
111 {
112 const struct nf_conntrack_l3proto *l3proto;
113 const struct nf_conntrack_l4proto *l4proto;
114 int ret;
115
116 rcu_read_lock();
117 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
118 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
119
120 if (ret >= 0) {
121 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
122 tuple->dst.protonum);
123 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
124 }
125 rcu_read_unlock();
126 return ret;
127 }
128
129 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
130 const struct nf_conntrack_zone *zone, int dir)
131 {
132 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
133 return 0;
134 if (nla_put_be16(skb, attrtype, htons(zone->id)))
135 goto nla_put_failure;
136 return 0;
137
138 nla_put_failure:
139 return -1;
140 }
141
142 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
143 {
144 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
145 goto nla_put_failure;
146 return 0;
147
148 nla_put_failure:
149 return -1;
150 }
151
152 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
153 {
154 long timeout = nf_ct_expires(ct) / HZ;
155
156 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
157 goto nla_put_failure;
158 return 0;
159
160 nla_put_failure:
161 return -1;
162 }
163
164 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
165 {
166 const struct nf_conntrack_l4proto *l4proto;
167 struct nlattr *nest_proto;
168 int ret;
169
170 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
171 if (!l4proto->to_nlattr)
172 return 0;
173
174 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
175 if (!nest_proto)
176 goto nla_put_failure;
177
178 ret = l4proto->to_nlattr(skb, nest_proto, ct);
179
180 nla_nest_end(skb, nest_proto);
181
182 return ret;
183
184 nla_put_failure:
185 return -1;
186 }
187
188 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
189 const struct nf_conn *ct)
190 {
191 struct nlattr *nest_helper;
192 const struct nf_conn_help *help = nfct_help(ct);
193 struct nf_conntrack_helper *helper;
194
195 if (!help)
196 return 0;
197
198 helper = rcu_dereference(help->helper);
199 if (!helper)
200 goto out;
201
202 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
203 if (!nest_helper)
204 goto nla_put_failure;
205 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
206 goto nla_put_failure;
207
208 if (helper->to_nlattr)
209 helper->to_nlattr(skb, ct);
210
211 nla_nest_end(skb, nest_helper);
212 out:
213 return 0;
214
215 nla_put_failure:
216 return -1;
217 }
218
219 static int
220 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
221 enum ip_conntrack_dir dir, int type)
222 {
223 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
224 struct nf_conn_counter *counter = acct->counter;
225 struct nlattr *nest_count;
226 u64 pkts, bytes;
227
228 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
229 pkts = atomic64_xchg(&counter[dir].packets, 0);
230 bytes = atomic64_xchg(&counter[dir].bytes, 0);
231 } else {
232 pkts = atomic64_read(&counter[dir].packets);
233 bytes = atomic64_read(&counter[dir].bytes);
234 }
235
236 nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
237 if (!nest_count)
238 goto nla_put_failure;
239
240 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
241 CTA_COUNTERS_PAD) ||
242 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
243 CTA_COUNTERS_PAD))
244 goto nla_put_failure;
245
246 nla_nest_end(skb, nest_count);
247
248 return 0;
249
250 nla_put_failure:
251 return -1;
252 }
253
254 static int
255 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
256 {
257 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
258
259 if (!acct)
260 return 0;
261
262 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
263 return -1;
264 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
265 return -1;
266
267 return 0;
268 }
269
270 static int
271 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
272 {
273 struct nlattr *nest_count;
274 const struct nf_conn_tstamp *tstamp;
275
276 tstamp = nf_conn_tstamp_find(ct);
277 if (!tstamp)
278 return 0;
279
280 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
281 if (!nest_count)
282 goto nla_put_failure;
283
284 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
285 CTA_TIMESTAMP_PAD) ||
286 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
287 cpu_to_be64(tstamp->stop),
288 CTA_TIMESTAMP_PAD)))
289 goto nla_put_failure;
290 nla_nest_end(skb, nest_count);
291
292 return 0;
293
294 nla_put_failure:
295 return -1;
296 }
297
298 #ifdef CONFIG_NF_CONNTRACK_MARK
299 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
300 {
301 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
302 goto nla_put_failure;
303 return 0;
304
305 nla_put_failure:
306 return -1;
307 }
308 #else
309 #define ctnetlink_dump_mark(a, b) (0)
310 #endif
311
312 #ifdef CONFIG_NF_CONNTRACK_SECMARK
313 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
314 {
315 struct nlattr *nest_secctx;
316 int len, ret;
317 char *secctx;
318
319 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
320 if (ret)
321 return 0;
322
323 ret = -1;
324 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
325 if (!nest_secctx)
326 goto nla_put_failure;
327
328 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
329 goto nla_put_failure;
330 nla_nest_end(skb, nest_secctx);
331
332 ret = 0;
333 nla_put_failure:
334 security_release_secctx(secctx, len);
335 return ret;
336 }
337 #else
338 #define ctnetlink_dump_secctx(a, b) (0)
339 #endif
340
341 #ifdef CONFIG_NF_CONNTRACK_LABELS
342 static inline int ctnetlink_label_size(const struct nf_conn *ct)
343 {
344 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
345
346 if (!labels)
347 return 0;
348 return nla_total_size(sizeof(labels->bits));
349 }
350
351 static int
352 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
353 {
354 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
355 unsigned int i;
356
357 if (!labels)
358 return 0;
359
360 i = 0;
361 do {
362 if (labels->bits[i] != 0)
363 return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
364 labels->bits);
365 i++;
366 } while (i < ARRAY_SIZE(labels->bits));
367
368 return 0;
369 }
370 #else
371 #define ctnetlink_dump_labels(a, b) (0)
372 #define ctnetlink_label_size(a) (0)
373 #endif
374
375 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
376
377 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
378 {
379 struct nlattr *nest_parms;
380
381 if (!(ct->status & IPS_EXPECTED))
382 return 0;
383
384 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
385 if (!nest_parms)
386 goto nla_put_failure;
387 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
388 goto nla_put_failure;
389 nla_nest_end(skb, nest_parms);
390
391 return 0;
392
393 nla_put_failure:
394 return -1;
395 }
396
397 static int
398 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
399 {
400 struct nlattr *nest_parms;
401
402 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
403 if (!nest_parms)
404 goto nla_put_failure;
405
406 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
407 htonl(seq->correction_pos)) ||
408 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
409 htonl(seq->offset_before)) ||
410 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
411 htonl(seq->offset_after)))
412 goto nla_put_failure;
413
414 nla_nest_end(skb, nest_parms);
415
416 return 0;
417
418 nla_put_failure:
419 return -1;
420 }
421
422 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
423 {
424 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
425 struct nf_ct_seqadj *seq;
426
427 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
428 return 0;
429
430 spin_lock_bh(&ct->lock);
431 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
432 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
433 goto err;
434
435 seq = &seqadj->seq[IP_CT_DIR_REPLY];
436 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
437 goto err;
438
439 spin_unlock_bh(&ct->lock);
440 return 0;
441 err:
442 spin_unlock_bh(&ct->lock);
443 return -1;
444 }
445
446 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
447 {
448 if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
449 goto nla_put_failure;
450 return 0;
451
452 nla_put_failure:
453 return -1;
454 }
455
456 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
457 {
458 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
459 goto nla_put_failure;
460 return 0;
461
462 nla_put_failure:
463 return -1;
464 }
465
466 static int
467 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
468 struct nf_conn *ct)
469 {
470 const struct nf_conntrack_zone *zone;
471 struct nlmsghdr *nlh;
472 struct nfgenmsg *nfmsg;
473 struct nlattr *nest_parms;
474 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
475
476 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
477 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
478 if (nlh == NULL)
479 goto nlmsg_failure;
480
481 nfmsg = nlmsg_data(nlh);
482 nfmsg->nfgen_family = nf_ct_l3num(ct);
483 nfmsg->version = NFNETLINK_V0;
484 nfmsg->res_id = 0;
485
486 zone = nf_ct_zone(ct);
487
488 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
489 if (!nest_parms)
490 goto nla_put_failure;
491 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
492 goto nla_put_failure;
493 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
494 NF_CT_ZONE_DIR_ORIG) < 0)
495 goto nla_put_failure;
496 nla_nest_end(skb, nest_parms);
497
498 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
499 if (!nest_parms)
500 goto nla_put_failure;
501 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
502 goto nla_put_failure;
503 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
504 NF_CT_ZONE_DIR_REPL) < 0)
505 goto nla_put_failure;
506 nla_nest_end(skb, nest_parms);
507
508 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
509 NF_CT_DEFAULT_ZONE_DIR) < 0)
510 goto nla_put_failure;
511
512 if (ctnetlink_dump_status(skb, ct) < 0 ||
513 ctnetlink_dump_timeout(skb, ct) < 0 ||
514 ctnetlink_dump_acct(skb, ct, type) < 0 ||
515 ctnetlink_dump_timestamp(skb, ct) < 0 ||
516 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
517 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
518 ctnetlink_dump_mark(skb, ct) < 0 ||
519 ctnetlink_dump_secctx(skb, ct) < 0 ||
520 ctnetlink_dump_labels(skb, ct) < 0 ||
521 ctnetlink_dump_id(skb, ct) < 0 ||
522 ctnetlink_dump_use(skb, ct) < 0 ||
523 ctnetlink_dump_master(skb, ct) < 0 ||
524 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
525 goto nla_put_failure;
526
527 nlmsg_end(skb, nlh);
528 return skb->len;
529
530 nlmsg_failure:
531 nla_put_failure:
532 nlmsg_cancel(skb, nlh);
533 return -1;
534 }
535
536 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
537 static size_t ctnetlink_proto_size(const struct nf_conn *ct)
538 {
539 const struct nf_conntrack_l3proto *l3proto;
540 const struct nf_conntrack_l4proto *l4proto;
541 size_t len, len4 = 0;
542
543 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
544 len = l3proto->nla_size;
545 len *= 3u; /* ORIG, REPLY, MASTER */
546
547 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
548 len += l4proto->nla_size;
549 if (l4proto->nlattr_tuple_size) {
550 len4 = l4proto->nlattr_tuple_size();
551 len4 *= 3u; /* ORIG, REPLY, MASTER */
552 }
553
554 return len + len4;
555 }
556 #endif
557
558 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
559 {
560 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
561 return 0;
562 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
563 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
564 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
565 ;
566 }
567
568 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
569 {
570 #ifdef CONFIG_NF_CONNTRACK_SECMARK
571 int len, ret;
572
573 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
574 if (ret)
575 return 0;
576
577 return nla_total_size(0) /* CTA_SECCTX */
578 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
579 #else
580 return 0;
581 #endif
582 }
583
584 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
585 {
586 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
587 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
588 return 0;
589 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
590 #else
591 return 0;
592 #endif
593 }
594
595 #ifdef CONFIG_NF_CONNTRACK_EVENTS
596 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
597 {
598 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
599 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
600 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
601 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
602 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
603 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
604 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
605 + ctnetlink_acct_size(ct)
606 + ctnetlink_timestamp_size(ct)
607 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
608 + nla_total_size(0) /* CTA_PROTOINFO */
609 + nla_total_size(0) /* CTA_HELP */
610 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
611 + ctnetlink_secctx_size(ct)
612 #ifdef CONFIG_NF_NAT_NEEDED
613 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
614 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
615 #endif
616 #ifdef CONFIG_NF_CONNTRACK_MARK
617 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
618 #endif
619 #ifdef CONFIG_NF_CONNTRACK_ZONES
620 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
621 #endif
622 + ctnetlink_proto_size(ct)
623 + ctnetlink_label_size(ct)
624 ;
625 }
626
627 static int
628 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
629 {
630 const struct nf_conntrack_zone *zone;
631 struct net *net;
632 struct nlmsghdr *nlh;
633 struct nfgenmsg *nfmsg;
634 struct nlattr *nest_parms;
635 struct nf_conn *ct = item->ct;
636 struct sk_buff *skb;
637 unsigned int type;
638 unsigned int flags = 0, group;
639 int err;
640
641 if (events & (1 << IPCT_DESTROY)) {
642 type = IPCTNL_MSG_CT_DELETE;
643 group = NFNLGRP_CONNTRACK_DESTROY;
644 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
645 type = IPCTNL_MSG_CT_NEW;
646 flags = NLM_F_CREATE|NLM_F_EXCL;
647 group = NFNLGRP_CONNTRACK_NEW;
648 } else if (events) {
649 type = IPCTNL_MSG_CT_NEW;
650 group = NFNLGRP_CONNTRACK_UPDATE;
651 } else
652 return 0;
653
654 net = nf_ct_net(ct);
655 if (!item->report && !nfnetlink_has_listeners(net, group))
656 return 0;
657
658 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
659 if (skb == NULL)
660 goto errout;
661
662 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
663 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
664 if (nlh == NULL)
665 goto nlmsg_failure;
666
667 nfmsg = nlmsg_data(nlh);
668 nfmsg->nfgen_family = nf_ct_l3num(ct);
669 nfmsg->version = NFNETLINK_V0;
670 nfmsg->res_id = 0;
671
672 zone = nf_ct_zone(ct);
673
674 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
675 if (!nest_parms)
676 goto nla_put_failure;
677 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
678 goto nla_put_failure;
679 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
680 NF_CT_ZONE_DIR_ORIG) < 0)
681 goto nla_put_failure;
682 nla_nest_end(skb, nest_parms);
683
684 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
685 if (!nest_parms)
686 goto nla_put_failure;
687 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
688 goto nla_put_failure;
689 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
690 NF_CT_ZONE_DIR_REPL) < 0)
691 goto nla_put_failure;
692 nla_nest_end(skb, nest_parms);
693
694 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
695 NF_CT_DEFAULT_ZONE_DIR) < 0)
696 goto nla_put_failure;
697
698 if (ctnetlink_dump_id(skb, ct) < 0)
699 goto nla_put_failure;
700
701 if (ctnetlink_dump_status(skb, ct) < 0)
702 goto nla_put_failure;
703
704 if (events & (1 << IPCT_DESTROY)) {
705 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
706 ctnetlink_dump_timestamp(skb, ct) < 0)
707 goto nla_put_failure;
708 } else {
709 if (ctnetlink_dump_timeout(skb, ct) < 0)
710 goto nla_put_failure;
711
712 if (events & (1 << IPCT_PROTOINFO)
713 && ctnetlink_dump_protoinfo(skb, ct) < 0)
714 goto nla_put_failure;
715
716 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
717 && ctnetlink_dump_helpinfo(skb, ct) < 0)
718 goto nla_put_failure;
719
720 #ifdef CONFIG_NF_CONNTRACK_SECMARK
721 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
722 && ctnetlink_dump_secctx(skb, ct) < 0)
723 goto nla_put_failure;
724 #endif
725 if (events & (1 << IPCT_LABEL) &&
726 ctnetlink_dump_labels(skb, ct) < 0)
727 goto nla_put_failure;
728
729 if (events & (1 << IPCT_RELATED) &&
730 ctnetlink_dump_master(skb, ct) < 0)
731 goto nla_put_failure;
732
733 if (events & (1 << IPCT_SEQADJ) &&
734 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
735 goto nla_put_failure;
736 }
737
738 #ifdef CONFIG_NF_CONNTRACK_MARK
739 if ((events & (1 << IPCT_MARK) || ct->mark)
740 && ctnetlink_dump_mark(skb, ct) < 0)
741 goto nla_put_failure;
742 #endif
743 nlmsg_end(skb, nlh);
744 err = nfnetlink_send(skb, net, item->portid, group, item->report,
745 GFP_ATOMIC);
746 if (err == -ENOBUFS || err == -EAGAIN)
747 return -ENOBUFS;
748
749 return 0;
750
751 nla_put_failure:
752 nlmsg_cancel(skb, nlh);
753 nlmsg_failure:
754 kfree_skb(skb);
755 errout:
756 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
757 return -ENOBUFS;
758
759 return 0;
760 }
761 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
762
763 static int ctnetlink_done(struct netlink_callback *cb)
764 {
765 if (cb->args[1])
766 nf_ct_put((struct nf_conn *)cb->args[1]);
767 kfree(cb->data);
768 return 0;
769 }
770
771 struct ctnetlink_filter {
772 struct {
773 u_int32_t val;
774 u_int32_t mask;
775 } mark;
776 };
777
778 static struct ctnetlink_filter *
779 ctnetlink_alloc_filter(const struct nlattr * const cda[])
780 {
781 #ifdef CONFIG_NF_CONNTRACK_MARK
782 struct ctnetlink_filter *filter;
783
784 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
785 if (filter == NULL)
786 return ERR_PTR(-ENOMEM);
787
788 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
789 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
790
791 return filter;
792 #else
793 return ERR_PTR(-EOPNOTSUPP);
794 #endif
795 }
796
797 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
798 {
799 struct ctnetlink_filter *filter = data;
800
801 if (filter == NULL)
802 return 1;
803
804 #ifdef CONFIG_NF_CONNTRACK_MARK
805 if ((ct->mark & filter->mark.mask) == filter->mark.val)
806 return 1;
807 #endif
808
809 return 0;
810 }
811
812 static int
813 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
814 {
815 struct net *net = sock_net(skb->sk);
816 struct nf_conn *ct, *last;
817 struct nf_conntrack_tuple_hash *h;
818 struct hlist_nulls_node *n;
819 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
820 u_int8_t l3proto = nfmsg->nfgen_family;
821 struct nf_conn *nf_ct_evict[8];
822 int res, i;
823 spinlock_t *lockp;
824
825 last = (struct nf_conn *)cb->args[1];
826 i = 0;
827
828 local_bh_disable();
829 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
830 restart:
831 while (i) {
832 i--;
833 if (nf_ct_should_gc(nf_ct_evict[i]))
834 nf_ct_kill(nf_ct_evict[i]);
835 nf_ct_put(nf_ct_evict[i]);
836 }
837
838 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
839 nf_conntrack_lock(lockp);
840 if (cb->args[0] >= nf_conntrack_htable_size) {
841 spin_unlock(lockp);
842 goto out;
843 }
844 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
845 hnnode) {
846 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
847 continue;
848 ct = nf_ct_tuplehash_to_ctrack(h);
849 if (nf_ct_is_expired(ct)) {
850 if (i < ARRAY_SIZE(nf_ct_evict) &&
851 atomic_inc_not_zero(&ct->ct_general.use))
852 nf_ct_evict[i++] = ct;
853 continue;
854 }
855
856 if (!net_eq(net, nf_ct_net(ct)))
857 continue;
858
859 /* Dump entries of a given L3 protocol number.
860 * If it is not specified, ie. l3proto == 0,
861 * then dump everything. */
862 if (l3proto && nf_ct_l3num(ct) != l3proto)
863 continue;
864 if (cb->args[1]) {
865 if (ct != last)
866 continue;
867 cb->args[1] = 0;
868 }
869 if (!ctnetlink_filter_match(ct, cb->data))
870 continue;
871
872 rcu_read_lock();
873 res =
874 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
875 cb->nlh->nlmsg_seq,
876 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
877 ct);
878 rcu_read_unlock();
879 if (res < 0) {
880 nf_conntrack_get(&ct->ct_general);
881 cb->args[1] = (unsigned long)ct;
882 spin_unlock(lockp);
883 goto out;
884 }
885 }
886 spin_unlock(lockp);
887 if (cb->args[1]) {
888 cb->args[1] = 0;
889 goto restart;
890 }
891 }
892 out:
893 local_bh_enable();
894 if (last) {
895 /* nf ct hash resize happened, now clear the leftover. */
896 if ((struct nf_conn *)cb->args[1] == last)
897 cb->args[1] = 0;
898
899 nf_ct_put(last);
900 }
901
902 while (i) {
903 i--;
904 if (nf_ct_should_gc(nf_ct_evict[i]))
905 nf_ct_kill(nf_ct_evict[i]);
906 nf_ct_put(nf_ct_evict[i]);
907 }
908
909 return skb->len;
910 }
911
912 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
913 struct nf_conntrack_tuple *tuple)
914 {
915 struct nlattr *tb[CTA_IP_MAX+1];
916 struct nf_conntrack_l3proto *l3proto;
917 int ret = 0;
918
919 ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL, NULL);
920 if (ret < 0)
921 return ret;
922
923 rcu_read_lock();
924 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
925
926 if (likely(l3proto->nlattr_to_tuple)) {
927 ret = nla_validate_nested(attr, CTA_IP_MAX,
928 l3proto->nla_policy, NULL);
929 if (ret == 0)
930 ret = l3proto->nlattr_to_tuple(tb, tuple);
931 }
932
933 rcu_read_unlock();
934
935 return ret;
936 }
937
938 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
939 [CTA_PROTO_NUM] = { .type = NLA_U8 },
940 };
941
942 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
943 struct nf_conntrack_tuple *tuple)
944 {
945 const struct nf_conntrack_l4proto *l4proto;
946 struct nlattr *tb[CTA_PROTO_MAX+1];
947 int ret = 0;
948
949 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy,
950 NULL);
951 if (ret < 0)
952 return ret;
953
954 if (!tb[CTA_PROTO_NUM])
955 return -EINVAL;
956 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
957
958 rcu_read_lock();
959 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
960
961 if (likely(l4proto->nlattr_to_tuple)) {
962 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
963 l4proto->nla_policy, NULL);
964 if (ret == 0)
965 ret = l4proto->nlattr_to_tuple(tb, tuple);
966 }
967
968 rcu_read_unlock();
969
970 return ret;
971 }
972
973 static int
974 ctnetlink_parse_zone(const struct nlattr *attr,
975 struct nf_conntrack_zone *zone)
976 {
977 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
978 NF_CT_DEFAULT_ZONE_DIR, 0);
979 #ifdef CONFIG_NF_CONNTRACK_ZONES
980 if (attr)
981 zone->id = ntohs(nla_get_be16(attr));
982 #else
983 if (attr)
984 return -EOPNOTSUPP;
985 #endif
986 return 0;
987 }
988
989 static int
990 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
991 struct nf_conntrack_zone *zone)
992 {
993 int ret;
994
995 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
996 return -EINVAL;
997
998 ret = ctnetlink_parse_zone(attr, zone);
999 if (ret < 0)
1000 return ret;
1001
1002 if (type == CTA_TUPLE_REPLY)
1003 zone->dir = NF_CT_ZONE_DIR_REPL;
1004 else
1005 zone->dir = NF_CT_ZONE_DIR_ORIG;
1006
1007 return 0;
1008 }
1009
1010 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1011 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1012 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1013 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1014 };
1015
1016 static int
1017 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1018 struct nf_conntrack_tuple *tuple, u32 type,
1019 u_int8_t l3num, struct nf_conntrack_zone *zone)
1020 {
1021 struct nlattr *tb[CTA_TUPLE_MAX+1];
1022 int err;
1023
1024 memset(tuple, 0, sizeof(*tuple));
1025
1026 err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy,
1027 NULL);
1028 if (err < 0)
1029 return err;
1030
1031 if (!tb[CTA_TUPLE_IP])
1032 return -EINVAL;
1033
1034 tuple->src.l3num = l3num;
1035
1036 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
1037 if (err < 0)
1038 return err;
1039
1040 if (!tb[CTA_TUPLE_PROTO])
1041 return -EINVAL;
1042
1043 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
1044 if (err < 0)
1045 return err;
1046
1047 if (tb[CTA_TUPLE_ZONE]) {
1048 if (!zone)
1049 return -EINVAL;
1050
1051 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1052 type, zone);
1053 if (err < 0)
1054 return err;
1055 }
1056
1057 /* orig and expect tuples get DIR_ORIGINAL */
1058 if (type == CTA_TUPLE_REPLY)
1059 tuple->dst.dir = IP_CT_DIR_REPLY;
1060 else
1061 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1062
1063 return 0;
1064 }
1065
1066 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1067 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1068 .len = NF_CT_HELPER_NAME_LEN - 1 },
1069 };
1070
1071 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1072 struct nlattr **helpinfo)
1073 {
1074 int err;
1075 struct nlattr *tb[CTA_HELP_MAX+1];
1076
1077 err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy, NULL);
1078 if (err < 0)
1079 return err;
1080
1081 if (!tb[CTA_HELP_NAME])
1082 return -EINVAL;
1083
1084 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1085
1086 if (tb[CTA_HELP_INFO])
1087 *helpinfo = tb[CTA_HELP_INFO];
1088
1089 return 0;
1090 }
1091
1092 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1093 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1094 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1095 [CTA_STATUS] = { .type = NLA_U32 },
1096 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1097 [CTA_HELP] = { .type = NLA_NESTED },
1098 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1099 [CTA_TIMEOUT] = { .type = NLA_U32 },
1100 [CTA_MARK] = { .type = NLA_U32 },
1101 [CTA_ID] = { .type = NLA_U32 },
1102 [CTA_NAT_DST] = { .type = NLA_NESTED },
1103 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1104 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1105 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1106 [CTA_ZONE] = { .type = NLA_U16 },
1107 [CTA_MARK_MASK] = { .type = NLA_U32 },
1108 [CTA_LABELS] = { .type = NLA_BINARY,
1109 .len = NF_CT_LABELS_MAX_SIZE },
1110 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1111 .len = NF_CT_LABELS_MAX_SIZE },
1112 };
1113
1114 static int ctnetlink_flush_conntrack(struct net *net,
1115 const struct nlattr * const cda[],
1116 u32 portid, int report)
1117 {
1118 struct ctnetlink_filter *filter = NULL;
1119
1120 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1121 filter = ctnetlink_alloc_filter(cda);
1122 if (IS_ERR(filter))
1123 return PTR_ERR(filter);
1124 }
1125
1126 nf_ct_iterate_cleanup_net(net, ctnetlink_filter_match, filter,
1127 portid, report);
1128 kfree(filter);
1129
1130 return 0;
1131 }
1132
1133 static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1134 struct sk_buff *skb,
1135 const struct nlmsghdr *nlh,
1136 const struct nlattr * const cda[],
1137 struct netlink_ext_ack *extack)
1138 {
1139 struct nf_conntrack_tuple_hash *h;
1140 struct nf_conntrack_tuple tuple;
1141 struct nf_conn *ct;
1142 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1143 u_int8_t u3 = nfmsg->nfgen_family;
1144 struct nf_conntrack_zone zone;
1145 int err;
1146
1147 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1148 if (err < 0)
1149 return err;
1150
1151 if (cda[CTA_TUPLE_ORIG])
1152 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1153 u3, &zone);
1154 else if (cda[CTA_TUPLE_REPLY])
1155 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1156 u3, &zone);
1157 else {
1158 return ctnetlink_flush_conntrack(net, cda,
1159 NETLINK_CB(skb).portid,
1160 nlmsg_report(nlh));
1161 }
1162
1163 if (err < 0)
1164 return err;
1165
1166 h = nf_conntrack_find_get(net, &zone, &tuple);
1167 if (!h)
1168 return -ENOENT;
1169
1170 ct = nf_ct_tuplehash_to_ctrack(h);
1171
1172 if (cda[CTA_ID]) {
1173 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1174 if (id != (u32)(unsigned long)ct) {
1175 nf_ct_put(ct);
1176 return -ENOENT;
1177 }
1178 }
1179
1180 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1181 nf_ct_put(ct);
1182
1183 return 0;
1184 }
1185
1186 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1187 struct sk_buff *skb,
1188 const struct nlmsghdr *nlh,
1189 const struct nlattr * const cda[],
1190 struct netlink_ext_ack *extack)
1191 {
1192 struct nf_conntrack_tuple_hash *h;
1193 struct nf_conntrack_tuple tuple;
1194 struct nf_conn *ct;
1195 struct sk_buff *skb2 = NULL;
1196 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1197 u_int8_t u3 = nfmsg->nfgen_family;
1198 struct nf_conntrack_zone zone;
1199 int err;
1200
1201 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1202 struct netlink_dump_control c = {
1203 .dump = ctnetlink_dump_table,
1204 .done = ctnetlink_done,
1205 };
1206
1207 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1208 struct ctnetlink_filter *filter;
1209
1210 filter = ctnetlink_alloc_filter(cda);
1211 if (IS_ERR(filter))
1212 return PTR_ERR(filter);
1213
1214 c.data = filter;
1215 }
1216 return netlink_dump_start(ctnl, skb, nlh, &c);
1217 }
1218
1219 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1220 if (err < 0)
1221 return err;
1222
1223 if (cda[CTA_TUPLE_ORIG])
1224 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1225 u3, &zone);
1226 else if (cda[CTA_TUPLE_REPLY])
1227 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1228 u3, &zone);
1229 else
1230 return -EINVAL;
1231
1232 if (err < 0)
1233 return err;
1234
1235 h = nf_conntrack_find_get(net, &zone, &tuple);
1236 if (!h)
1237 return -ENOENT;
1238
1239 ct = nf_ct_tuplehash_to_ctrack(h);
1240
1241 err = -ENOMEM;
1242 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1243 if (skb2 == NULL) {
1244 nf_ct_put(ct);
1245 return -ENOMEM;
1246 }
1247
1248 rcu_read_lock();
1249 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1250 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1251 rcu_read_unlock();
1252 nf_ct_put(ct);
1253 if (err <= 0)
1254 goto free;
1255
1256 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1257 if (err < 0)
1258 goto out;
1259
1260 return 0;
1261
1262 free:
1263 kfree_skb(skb2);
1264 out:
1265 /* this avoids a loop in nfnetlink. */
1266 return err == -EAGAIN ? -ENOBUFS : err;
1267 }
1268
1269 static int ctnetlink_done_list(struct netlink_callback *cb)
1270 {
1271 if (cb->args[1])
1272 nf_ct_put((struct nf_conn *)cb->args[1]);
1273 return 0;
1274 }
1275
1276 static int
1277 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1278 {
1279 struct nf_conn *ct, *last;
1280 struct nf_conntrack_tuple_hash *h;
1281 struct hlist_nulls_node *n;
1282 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1283 u_int8_t l3proto = nfmsg->nfgen_family;
1284 int res;
1285 int cpu;
1286 struct hlist_nulls_head *list;
1287 struct net *net = sock_net(skb->sk);
1288
1289 if (cb->args[2])
1290 return 0;
1291
1292 last = (struct nf_conn *)cb->args[1];
1293
1294 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1295 struct ct_pcpu *pcpu;
1296
1297 if (!cpu_possible(cpu))
1298 continue;
1299
1300 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1301 spin_lock_bh(&pcpu->lock);
1302 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1303 restart:
1304 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1305 ct = nf_ct_tuplehash_to_ctrack(h);
1306 if (l3proto && nf_ct_l3num(ct) != l3proto)
1307 continue;
1308 if (cb->args[1]) {
1309 if (ct != last)
1310 continue;
1311 cb->args[1] = 0;
1312 }
1313 rcu_read_lock();
1314 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1315 cb->nlh->nlmsg_seq,
1316 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1317 ct);
1318 rcu_read_unlock();
1319 if (res < 0) {
1320 if (!atomic_inc_not_zero(&ct->ct_general.use))
1321 continue;
1322 cb->args[0] = cpu;
1323 cb->args[1] = (unsigned long)ct;
1324 spin_unlock_bh(&pcpu->lock);
1325 goto out;
1326 }
1327 }
1328 if (cb->args[1]) {
1329 cb->args[1] = 0;
1330 goto restart;
1331 }
1332 spin_unlock_bh(&pcpu->lock);
1333 }
1334 cb->args[2] = 1;
1335 out:
1336 if (last)
1337 nf_ct_put(last);
1338
1339 return skb->len;
1340 }
1341
1342 static int
1343 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1344 {
1345 return ctnetlink_dump_list(skb, cb, true);
1346 }
1347
1348 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1349 struct sk_buff *skb,
1350 const struct nlmsghdr *nlh,
1351 const struct nlattr * const cda[],
1352 struct netlink_ext_ack *extack)
1353 {
1354 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1355 struct netlink_dump_control c = {
1356 .dump = ctnetlink_dump_dying,
1357 .done = ctnetlink_done_list,
1358 };
1359 return netlink_dump_start(ctnl, skb, nlh, &c);
1360 }
1361
1362 return -EOPNOTSUPP;
1363 }
1364
1365 static int
1366 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1367 {
1368 return ctnetlink_dump_list(skb, cb, false);
1369 }
1370
1371 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1372 struct sk_buff *skb,
1373 const struct nlmsghdr *nlh,
1374 const struct nlattr * const cda[],
1375 struct netlink_ext_ack *extack)
1376 {
1377 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1378 struct netlink_dump_control c = {
1379 .dump = ctnetlink_dump_unconfirmed,
1380 .done = ctnetlink_done_list,
1381 };
1382 return netlink_dump_start(ctnl, skb, nlh, &c);
1383 }
1384
1385 return -EOPNOTSUPP;
1386 }
1387
1388 #ifdef CONFIG_NF_NAT_NEEDED
1389 static int
1390 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1391 enum nf_nat_manip_type manip,
1392 const struct nlattr *attr)
1393 {
1394 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1395 int err;
1396
1397 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1398 if (!parse_nat_setup) {
1399 #ifdef CONFIG_MODULES
1400 rcu_read_unlock();
1401 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1402 if (request_module("nf-nat") < 0) {
1403 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1404 rcu_read_lock();
1405 return -EOPNOTSUPP;
1406 }
1407 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1408 rcu_read_lock();
1409 if (nfnetlink_parse_nat_setup_hook)
1410 return -EAGAIN;
1411 #endif
1412 return -EOPNOTSUPP;
1413 }
1414
1415 err = parse_nat_setup(ct, manip, attr);
1416 if (err == -EAGAIN) {
1417 #ifdef CONFIG_MODULES
1418 rcu_read_unlock();
1419 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1420 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1421 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1422 rcu_read_lock();
1423 return -EOPNOTSUPP;
1424 }
1425 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1426 rcu_read_lock();
1427 #else
1428 err = -EOPNOTSUPP;
1429 #endif
1430 }
1431 return err;
1432 }
1433 #endif
1434
1435 static void
1436 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1437 unsigned long off)
1438 {
1439 unsigned int bit;
1440
1441 /* Ignore these unchangable bits */
1442 on &= ~IPS_UNCHANGEABLE_MASK;
1443 off &= ~IPS_UNCHANGEABLE_MASK;
1444
1445 for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1446 if (on & (1 << bit))
1447 set_bit(bit, &ct->status);
1448 else if (off & (1 << bit))
1449 clear_bit(bit, &ct->status);
1450 }
1451 }
1452
1453 static int
1454 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1455 {
1456 unsigned long d;
1457 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1458 d = ct->status ^ status;
1459
1460 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1461 /* unchangeable */
1462 return -EBUSY;
1463
1464 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1465 /* SEEN_REPLY bit can only be set */
1466 return -EBUSY;
1467
1468 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1469 /* ASSURED bit can only be set */
1470 return -EBUSY;
1471
1472 __ctnetlink_change_status(ct, status, 0);
1473 return 0;
1474 }
1475
1476 static int
1477 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1478 {
1479 #ifdef CONFIG_NF_NAT_NEEDED
1480 int ret;
1481
1482 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1483 return 0;
1484
1485 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1486 cda[CTA_NAT_DST]);
1487 if (ret < 0)
1488 return ret;
1489
1490 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1491 cda[CTA_NAT_SRC]);
1492 return ret;
1493 #else
1494 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1495 return 0;
1496 return -EOPNOTSUPP;
1497 #endif
1498 }
1499
1500 static int ctnetlink_change_helper(struct nf_conn *ct,
1501 const struct nlattr * const cda[])
1502 {
1503 struct nf_conntrack_helper *helper;
1504 struct nf_conn_help *help = nfct_help(ct);
1505 char *helpname = NULL;
1506 struct nlattr *helpinfo = NULL;
1507 int err;
1508
1509 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1510 if (err < 0)
1511 return err;
1512
1513 /* don't change helper of sibling connections */
1514 if (ct->master) {
1515 /* If we try to change the helper to the same thing twice,
1516 * treat the second attempt as a no-op instead of returning
1517 * an error.
1518 */
1519 err = -EBUSY;
1520 if (help) {
1521 rcu_read_lock();
1522 helper = rcu_dereference(help->helper);
1523 if (helper && !strcmp(helper->name, helpname))
1524 err = 0;
1525 rcu_read_unlock();
1526 }
1527
1528 return err;
1529 }
1530
1531 if (!strcmp(helpname, "")) {
1532 if (help && help->helper) {
1533 /* we had a helper before ... */
1534 nf_ct_remove_expectations(ct);
1535 RCU_INIT_POINTER(help->helper, NULL);
1536 }
1537
1538 return 0;
1539 }
1540
1541 rcu_read_lock();
1542 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1543 nf_ct_protonum(ct));
1544 if (helper == NULL) {
1545 rcu_read_unlock();
1546 return -EOPNOTSUPP;
1547 }
1548
1549 if (help) {
1550 if (help->helper == helper) {
1551 /* update private helper data if allowed. */
1552 if (helper->from_nlattr)
1553 helper->from_nlattr(helpinfo, ct);
1554 err = 0;
1555 } else
1556 err = -EBUSY;
1557 } else {
1558 /* we cannot set a helper for an existing conntrack */
1559 err = -EOPNOTSUPP;
1560 }
1561
1562 rcu_read_unlock();
1563 return err;
1564 }
1565
1566 static int ctnetlink_change_timeout(struct nf_conn *ct,
1567 const struct nlattr * const cda[])
1568 {
1569 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1570
1571 ct->timeout = nfct_time_stamp + timeout * HZ;
1572
1573 if (test_bit(IPS_DYING_BIT, &ct->status))
1574 return -ETIME;
1575
1576 return 0;
1577 }
1578
1579 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1580 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1581 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1582 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1583 };
1584
1585 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
1586 const struct nlattr * const cda[])
1587 {
1588 const struct nlattr *attr = cda[CTA_PROTOINFO];
1589 const struct nf_conntrack_l4proto *l4proto;
1590 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1591 int err = 0;
1592
1593 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy,
1594 NULL);
1595 if (err < 0)
1596 return err;
1597
1598 rcu_read_lock();
1599 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1600 if (l4proto->from_nlattr)
1601 err = l4proto->from_nlattr(tb, ct);
1602 rcu_read_unlock();
1603
1604 return err;
1605 }
1606
1607 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1608 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1609 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1610 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1611 };
1612
1613 static int change_seq_adj(struct nf_ct_seqadj *seq,
1614 const struct nlattr * const attr)
1615 {
1616 int err;
1617 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1618
1619 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy, NULL);
1620 if (err < 0)
1621 return err;
1622
1623 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1624 return -EINVAL;
1625
1626 seq->correction_pos =
1627 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1628
1629 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1630 return -EINVAL;
1631
1632 seq->offset_before =
1633 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1634
1635 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1636 return -EINVAL;
1637
1638 seq->offset_after =
1639 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1640
1641 return 0;
1642 }
1643
1644 static int
1645 ctnetlink_change_seq_adj(struct nf_conn *ct,
1646 const struct nlattr * const cda[])
1647 {
1648 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1649 int ret = 0;
1650
1651 if (!seqadj)
1652 return 0;
1653
1654 spin_lock_bh(&ct->lock);
1655 if (cda[CTA_SEQ_ADJ_ORIG]) {
1656 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1657 cda[CTA_SEQ_ADJ_ORIG]);
1658 if (ret < 0)
1659 goto err;
1660
1661 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1662 }
1663
1664 if (cda[CTA_SEQ_ADJ_REPLY]) {
1665 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1666 cda[CTA_SEQ_ADJ_REPLY]);
1667 if (ret < 0)
1668 goto err;
1669
1670 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1671 }
1672
1673 spin_unlock_bh(&ct->lock);
1674 return 0;
1675 err:
1676 spin_unlock_bh(&ct->lock);
1677 return ret;
1678 }
1679
1680 static int
1681 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1682 {
1683 #ifdef CONFIG_NF_CONNTRACK_LABELS
1684 size_t len = nla_len(cda[CTA_LABELS]);
1685 const void *mask = cda[CTA_LABELS_MASK];
1686
1687 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1688 return -EINVAL;
1689
1690 if (mask) {
1691 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1692 nla_len(cda[CTA_LABELS_MASK]) != len)
1693 return -EINVAL;
1694 mask = nla_data(cda[CTA_LABELS_MASK]);
1695 }
1696
1697 len /= sizeof(u32);
1698
1699 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1700 #else
1701 return -EOPNOTSUPP;
1702 #endif
1703 }
1704
1705 static int
1706 ctnetlink_change_conntrack(struct nf_conn *ct,
1707 const struct nlattr * const cda[])
1708 {
1709 int err;
1710
1711 /* only allow NAT changes and master assignation for new conntracks */
1712 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1713 return -EOPNOTSUPP;
1714
1715 if (cda[CTA_HELP]) {
1716 err = ctnetlink_change_helper(ct, cda);
1717 if (err < 0)
1718 return err;
1719 }
1720
1721 if (cda[CTA_TIMEOUT]) {
1722 err = ctnetlink_change_timeout(ct, cda);
1723 if (err < 0)
1724 return err;
1725 }
1726
1727 if (cda[CTA_STATUS]) {
1728 err = ctnetlink_change_status(ct, cda);
1729 if (err < 0)
1730 return err;
1731 }
1732
1733 if (cda[CTA_PROTOINFO]) {
1734 err = ctnetlink_change_protoinfo(ct, cda);
1735 if (err < 0)
1736 return err;
1737 }
1738
1739 #if defined(CONFIG_NF_CONNTRACK_MARK)
1740 if (cda[CTA_MARK])
1741 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1742 #endif
1743
1744 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1745 err = ctnetlink_change_seq_adj(ct, cda);
1746 if (err < 0)
1747 return err;
1748 }
1749
1750 if (cda[CTA_LABELS]) {
1751 err = ctnetlink_attach_labels(ct, cda);
1752 if (err < 0)
1753 return err;
1754 }
1755
1756 return 0;
1757 }
1758
1759 static struct nf_conn *
1760 ctnetlink_create_conntrack(struct net *net,
1761 const struct nf_conntrack_zone *zone,
1762 const struct nlattr * const cda[],
1763 struct nf_conntrack_tuple *otuple,
1764 struct nf_conntrack_tuple *rtuple,
1765 u8 u3)
1766 {
1767 struct nf_conn *ct;
1768 int err = -EINVAL;
1769 struct nf_conntrack_helper *helper;
1770 struct nf_conn_tstamp *tstamp;
1771
1772 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1773 if (IS_ERR(ct))
1774 return ERR_PTR(-ENOMEM);
1775
1776 if (!cda[CTA_TIMEOUT])
1777 goto err1;
1778
1779 ct->timeout = nfct_time_stamp + ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1780
1781 rcu_read_lock();
1782 if (cda[CTA_HELP]) {
1783 char *helpname = NULL;
1784 struct nlattr *helpinfo = NULL;
1785
1786 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1787 if (err < 0)
1788 goto err2;
1789
1790 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1791 nf_ct_protonum(ct));
1792 if (helper == NULL) {
1793 rcu_read_unlock();
1794 #ifdef CONFIG_MODULES
1795 if (request_module("nfct-helper-%s", helpname) < 0) {
1796 err = -EOPNOTSUPP;
1797 goto err1;
1798 }
1799
1800 rcu_read_lock();
1801 helper = __nf_conntrack_helper_find(helpname,
1802 nf_ct_l3num(ct),
1803 nf_ct_protonum(ct));
1804 if (helper) {
1805 err = -EAGAIN;
1806 goto err2;
1807 }
1808 rcu_read_unlock();
1809 #endif
1810 err = -EOPNOTSUPP;
1811 goto err1;
1812 } else {
1813 struct nf_conn_help *help;
1814
1815 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1816 if (help == NULL) {
1817 err = -ENOMEM;
1818 goto err2;
1819 }
1820 /* set private helper data if allowed. */
1821 if (helper->from_nlattr)
1822 helper->from_nlattr(helpinfo, ct);
1823
1824 /* not in hash table yet so not strictly necessary */
1825 RCU_INIT_POINTER(help->helper, helper);
1826 }
1827 } else {
1828 /* try an implicit helper assignation */
1829 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1830 if (err < 0)
1831 goto err2;
1832 }
1833
1834 err = ctnetlink_setup_nat(ct, cda);
1835 if (err < 0)
1836 goto err2;
1837
1838 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1839 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1840 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1841 nf_ct_labels_ext_add(ct);
1842 nfct_seqadj_ext_add(ct);
1843 nfct_synproxy_ext_add(ct);
1844
1845 /* we must add conntrack extensions before confirmation. */
1846 ct->status |= IPS_CONFIRMED;
1847
1848 if (cda[CTA_STATUS]) {
1849 err = ctnetlink_change_status(ct, cda);
1850 if (err < 0)
1851 goto err2;
1852 }
1853
1854 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1855 err = ctnetlink_change_seq_adj(ct, cda);
1856 if (err < 0)
1857 goto err2;
1858 }
1859
1860 memset(&ct->proto, 0, sizeof(ct->proto));
1861 if (cda[CTA_PROTOINFO]) {
1862 err = ctnetlink_change_protoinfo(ct, cda);
1863 if (err < 0)
1864 goto err2;
1865 }
1866
1867 #if defined(CONFIG_NF_CONNTRACK_MARK)
1868 if (cda[CTA_MARK])
1869 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1870 #endif
1871
1872 /* setup master conntrack: this is a confirmed expectation */
1873 if (cda[CTA_TUPLE_MASTER]) {
1874 struct nf_conntrack_tuple master;
1875 struct nf_conntrack_tuple_hash *master_h;
1876 struct nf_conn *master_ct;
1877
1878 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
1879 u3, NULL);
1880 if (err < 0)
1881 goto err2;
1882
1883 master_h = nf_conntrack_find_get(net, zone, &master);
1884 if (master_h == NULL) {
1885 err = -ENOENT;
1886 goto err2;
1887 }
1888 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1889 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1890 ct->master = master_ct;
1891 }
1892 tstamp = nf_conn_tstamp_find(ct);
1893 if (tstamp)
1894 tstamp->start = ktime_get_real_ns();
1895
1896 err = nf_conntrack_hash_check_insert(ct);
1897 if (err < 0)
1898 goto err2;
1899
1900 rcu_read_unlock();
1901
1902 return ct;
1903
1904 err2:
1905 rcu_read_unlock();
1906 err1:
1907 nf_conntrack_free(ct);
1908 return ERR_PTR(err);
1909 }
1910
1911 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
1912 struct sk_buff *skb,
1913 const struct nlmsghdr *nlh,
1914 const struct nlattr * const cda[],
1915 struct netlink_ext_ack *extack)
1916 {
1917 struct nf_conntrack_tuple otuple, rtuple;
1918 struct nf_conntrack_tuple_hash *h = NULL;
1919 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1920 struct nf_conn *ct;
1921 u_int8_t u3 = nfmsg->nfgen_family;
1922 struct nf_conntrack_zone zone;
1923 int err;
1924
1925 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1926 if (err < 0)
1927 return err;
1928
1929 if (cda[CTA_TUPLE_ORIG]) {
1930 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
1931 u3, &zone);
1932 if (err < 0)
1933 return err;
1934 }
1935
1936 if (cda[CTA_TUPLE_REPLY]) {
1937 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
1938 u3, &zone);
1939 if (err < 0)
1940 return err;
1941 }
1942
1943 if (cda[CTA_TUPLE_ORIG])
1944 h = nf_conntrack_find_get(net, &zone, &otuple);
1945 else if (cda[CTA_TUPLE_REPLY])
1946 h = nf_conntrack_find_get(net, &zone, &rtuple);
1947
1948 if (h == NULL) {
1949 err = -ENOENT;
1950 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1951 enum ip_conntrack_events events;
1952
1953 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1954 return -EINVAL;
1955 if (otuple.dst.protonum != rtuple.dst.protonum)
1956 return -EINVAL;
1957
1958 ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
1959 &rtuple, u3);
1960 if (IS_ERR(ct))
1961 return PTR_ERR(ct);
1962
1963 err = 0;
1964 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1965 events = 1 << IPCT_RELATED;
1966 else
1967 events = 1 << IPCT_NEW;
1968
1969 if (cda[CTA_LABELS] &&
1970 ctnetlink_attach_labels(ct, cda) == 0)
1971 events |= (1 << IPCT_LABEL);
1972
1973 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1974 (1 << IPCT_ASSURED) |
1975 (1 << IPCT_HELPER) |
1976 (1 << IPCT_PROTOINFO) |
1977 (1 << IPCT_SEQADJ) |
1978 (1 << IPCT_MARK) | events,
1979 ct, NETLINK_CB(skb).portid,
1980 nlmsg_report(nlh));
1981 nf_ct_put(ct);
1982 }
1983
1984 return err;
1985 }
1986 /* implicit 'else' */
1987
1988 err = -EEXIST;
1989 ct = nf_ct_tuplehash_to_ctrack(h);
1990 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1991 err = ctnetlink_change_conntrack(ct, cda);
1992 if (err == 0) {
1993 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1994 (1 << IPCT_ASSURED) |
1995 (1 << IPCT_HELPER) |
1996 (1 << IPCT_LABEL) |
1997 (1 << IPCT_PROTOINFO) |
1998 (1 << IPCT_SEQADJ) |
1999 (1 << IPCT_MARK),
2000 ct, NETLINK_CB(skb).portid,
2001 nlmsg_report(nlh));
2002 }
2003 }
2004
2005 nf_ct_put(ct);
2006 return err;
2007 }
2008
2009 static int
2010 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2011 __u16 cpu, const struct ip_conntrack_stat *st)
2012 {
2013 struct nlmsghdr *nlh;
2014 struct nfgenmsg *nfmsg;
2015 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2016
2017 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2018 IPCTNL_MSG_CT_GET_STATS_CPU);
2019 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2020 if (nlh == NULL)
2021 goto nlmsg_failure;
2022
2023 nfmsg = nlmsg_data(nlh);
2024 nfmsg->nfgen_family = AF_UNSPEC;
2025 nfmsg->version = NFNETLINK_V0;
2026 nfmsg->res_id = htons(cpu);
2027
2028 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2029 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2030 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
2031 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2032 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2033 htonl(st->insert_failed)) ||
2034 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2035 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2036 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2037 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2038 htonl(st->search_restart)))
2039 goto nla_put_failure;
2040
2041 nlmsg_end(skb, nlh);
2042 return skb->len;
2043
2044 nla_put_failure:
2045 nlmsg_failure:
2046 nlmsg_cancel(skb, nlh);
2047 return -1;
2048 }
2049
2050 static int
2051 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2052 {
2053 int cpu;
2054 struct net *net = sock_net(skb->sk);
2055
2056 if (cb->args[0] == nr_cpu_ids)
2057 return 0;
2058
2059 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2060 const struct ip_conntrack_stat *st;
2061
2062 if (!cpu_possible(cpu))
2063 continue;
2064
2065 st = per_cpu_ptr(net->ct.stat, cpu);
2066 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2067 NETLINK_CB(cb->skb).portid,
2068 cb->nlh->nlmsg_seq,
2069 cpu, st) < 0)
2070 break;
2071 }
2072 cb->args[0] = cpu;
2073
2074 return skb->len;
2075 }
2076
2077 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2078 struct sk_buff *skb,
2079 const struct nlmsghdr *nlh,
2080 const struct nlattr * const cda[],
2081 struct netlink_ext_ack *extack)
2082 {
2083 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2084 struct netlink_dump_control c = {
2085 .dump = ctnetlink_ct_stat_cpu_dump,
2086 };
2087 return netlink_dump_start(ctnl, skb, nlh, &c);
2088 }
2089
2090 return 0;
2091 }
2092
2093 static int
2094 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2095 struct net *net)
2096 {
2097 struct nlmsghdr *nlh;
2098 struct nfgenmsg *nfmsg;
2099 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2100 unsigned int nr_conntracks = atomic_read(&net->ct.count);
2101
2102 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2103 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2104 if (nlh == NULL)
2105 goto nlmsg_failure;
2106
2107 nfmsg = nlmsg_data(nlh);
2108 nfmsg->nfgen_family = AF_UNSPEC;
2109 nfmsg->version = NFNETLINK_V0;
2110 nfmsg->res_id = 0;
2111
2112 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2113 goto nla_put_failure;
2114
2115 nlmsg_end(skb, nlh);
2116 return skb->len;
2117
2118 nla_put_failure:
2119 nlmsg_failure:
2120 nlmsg_cancel(skb, nlh);
2121 return -1;
2122 }
2123
2124 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2125 struct sk_buff *skb, const struct nlmsghdr *nlh,
2126 const struct nlattr * const cda[],
2127 struct netlink_ext_ack *extack)
2128 {
2129 struct sk_buff *skb2;
2130 int err;
2131
2132 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2133 if (skb2 == NULL)
2134 return -ENOMEM;
2135
2136 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2137 nlh->nlmsg_seq,
2138 NFNL_MSG_TYPE(nlh->nlmsg_type),
2139 sock_net(skb->sk));
2140 if (err <= 0)
2141 goto free;
2142
2143 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2144 if (err < 0)
2145 goto out;
2146
2147 return 0;
2148
2149 free:
2150 kfree_skb(skb2);
2151 out:
2152 /* this avoids a loop in nfnetlink. */
2153 return err == -EAGAIN ? -ENOBUFS : err;
2154 }
2155
2156 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2157 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2158 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2159 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2160 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2161 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2162 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2163 .len = NF_CT_HELPER_NAME_LEN - 1 },
2164 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2165 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2166 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2167 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2168 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2169 };
2170
2171 static struct nf_conntrack_expect *
2172 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2173 struct nf_conntrack_helper *helper,
2174 struct nf_conntrack_tuple *tuple,
2175 struct nf_conntrack_tuple *mask);
2176
2177 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2178 static size_t
2179 ctnetlink_glue_build_size(const struct nf_conn *ct)
2180 {
2181 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2182 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2183 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2184 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2185 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2186 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2187 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2188 + nla_total_size(0) /* CTA_PROTOINFO */
2189 + nla_total_size(0) /* CTA_HELP */
2190 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2191 + ctnetlink_secctx_size(ct)
2192 #ifdef CONFIG_NF_NAT_NEEDED
2193 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2194 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2195 #endif
2196 #ifdef CONFIG_NF_CONNTRACK_MARK
2197 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2198 #endif
2199 #ifdef CONFIG_NF_CONNTRACK_ZONES
2200 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2201 #endif
2202 + ctnetlink_proto_size(ct)
2203 ;
2204 }
2205
2206 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2207 enum ip_conntrack_info *ctinfo)
2208 {
2209 return nf_ct_get(skb, ctinfo);
2210 }
2211
2212 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2213 {
2214 const struct nf_conntrack_zone *zone;
2215 struct nlattr *nest_parms;
2216
2217 zone = nf_ct_zone(ct);
2218
2219 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2220 if (!nest_parms)
2221 goto nla_put_failure;
2222 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2223 goto nla_put_failure;
2224 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2225 NF_CT_ZONE_DIR_ORIG) < 0)
2226 goto nla_put_failure;
2227 nla_nest_end(skb, nest_parms);
2228
2229 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2230 if (!nest_parms)
2231 goto nla_put_failure;
2232 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2233 goto nla_put_failure;
2234 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2235 NF_CT_ZONE_DIR_REPL) < 0)
2236 goto nla_put_failure;
2237 nla_nest_end(skb, nest_parms);
2238
2239 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2240 NF_CT_DEFAULT_ZONE_DIR) < 0)
2241 goto nla_put_failure;
2242
2243 if (ctnetlink_dump_id(skb, ct) < 0)
2244 goto nla_put_failure;
2245
2246 if (ctnetlink_dump_status(skb, ct) < 0)
2247 goto nla_put_failure;
2248
2249 if (ctnetlink_dump_timeout(skb, ct) < 0)
2250 goto nla_put_failure;
2251
2252 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2253 goto nla_put_failure;
2254
2255 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2256 goto nla_put_failure;
2257
2258 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2259 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2260 goto nla_put_failure;
2261 #endif
2262 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2263 goto nla_put_failure;
2264
2265 if ((ct->status & IPS_SEQ_ADJUST) &&
2266 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2267 goto nla_put_failure;
2268
2269 #ifdef CONFIG_NF_CONNTRACK_MARK
2270 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2271 goto nla_put_failure;
2272 #endif
2273 if (ctnetlink_dump_labels(skb, ct) < 0)
2274 goto nla_put_failure;
2275 return 0;
2276
2277 nla_put_failure:
2278 return -ENOSPC;
2279 }
2280
2281 static int
2282 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2283 enum ip_conntrack_info ctinfo,
2284 u_int16_t ct_attr, u_int16_t ct_info_attr)
2285 {
2286 struct nlattr *nest_parms;
2287
2288 nest_parms = nla_nest_start(skb, ct_attr | NLA_F_NESTED);
2289 if (!nest_parms)
2290 goto nla_put_failure;
2291
2292 if (__ctnetlink_glue_build(skb, ct) < 0)
2293 goto nla_put_failure;
2294
2295 nla_nest_end(skb, nest_parms);
2296
2297 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2298 goto nla_put_failure;
2299
2300 return 0;
2301
2302 nla_put_failure:
2303 return -ENOSPC;
2304 }
2305
2306 static int
2307 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2308 {
2309 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2310 unsigned long d = ct->status ^ status;
2311
2312 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2313 /* SEEN_REPLY bit can only be set */
2314 return -EBUSY;
2315
2316 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2317 /* ASSURED bit can only be set */
2318 return -EBUSY;
2319
2320 /* This check is less strict than ctnetlink_change_status()
2321 * because callers often flip IPS_EXPECTED bits when sending
2322 * an NFQA_CT attribute to the kernel. So ignore the
2323 * unchangeable bits but do not error out. Also user programs
2324 * are allowed to clear the bits that they are allowed to change.
2325 */
2326 __ctnetlink_change_status(ct, status, ~status);
2327 return 0;
2328 }
2329
2330 static int
2331 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2332 {
2333 int err;
2334
2335 if (cda[CTA_TIMEOUT]) {
2336 err = ctnetlink_change_timeout(ct, cda);
2337 if (err < 0)
2338 return err;
2339 }
2340 if (cda[CTA_STATUS]) {
2341 err = ctnetlink_update_status(ct, cda);
2342 if (err < 0)
2343 return err;
2344 }
2345 if (cda[CTA_HELP]) {
2346 err = ctnetlink_change_helper(ct, cda);
2347 if (err < 0)
2348 return err;
2349 }
2350 if (cda[CTA_LABELS]) {
2351 err = ctnetlink_attach_labels(ct, cda);
2352 if (err < 0)
2353 return err;
2354 }
2355 #if defined(CONFIG_NF_CONNTRACK_MARK)
2356 if (cda[CTA_MARK]) {
2357 u32 mask = 0, mark, newmark;
2358 if (cda[CTA_MARK_MASK])
2359 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2360
2361 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2362 newmark = (ct->mark & mask) ^ mark;
2363 if (newmark != ct->mark)
2364 ct->mark = newmark;
2365 }
2366 #endif
2367 return 0;
2368 }
2369
2370 static int
2371 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2372 {
2373 struct nlattr *cda[CTA_MAX+1];
2374 int ret;
2375
2376 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy, NULL);
2377 if (ret < 0)
2378 return ret;
2379
2380 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2381 }
2382
2383 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2384 const struct nf_conn *ct,
2385 struct nf_conntrack_tuple *tuple,
2386 struct nf_conntrack_tuple *mask)
2387 {
2388 int err;
2389
2390 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2391 nf_ct_l3num(ct), NULL);
2392 if (err < 0)
2393 return err;
2394
2395 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2396 nf_ct_l3num(ct), NULL);
2397 }
2398
2399 static int
2400 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2401 u32 portid, u32 report)
2402 {
2403 struct nlattr *cda[CTA_EXPECT_MAX+1];
2404 struct nf_conntrack_tuple tuple, mask;
2405 struct nf_conntrack_helper *helper = NULL;
2406 struct nf_conntrack_expect *exp;
2407 int err;
2408
2409 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy,
2410 NULL);
2411 if (err < 0)
2412 return err;
2413
2414 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2415 ct, &tuple, &mask);
2416 if (err < 0)
2417 return err;
2418
2419 if (cda[CTA_EXPECT_HELP_NAME]) {
2420 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2421
2422 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2423 nf_ct_protonum(ct));
2424 if (helper == NULL)
2425 return -EOPNOTSUPP;
2426 }
2427
2428 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2429 helper, &tuple, &mask);
2430 if (IS_ERR(exp))
2431 return PTR_ERR(exp);
2432
2433 err = nf_ct_expect_related_report(exp, portid, report);
2434 nf_ct_expect_put(exp);
2435 return err;
2436 }
2437
2438 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2439 enum ip_conntrack_info ctinfo, int diff)
2440 {
2441 if (!(ct->status & IPS_NAT_MASK))
2442 return;
2443
2444 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2445 }
2446
2447 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2448 .get_ct = ctnetlink_glue_get_ct,
2449 .build_size = ctnetlink_glue_build_size,
2450 .build = ctnetlink_glue_build,
2451 .parse = ctnetlink_glue_parse,
2452 .attach_expect = ctnetlink_glue_attach_expect,
2453 .seq_adjust = ctnetlink_glue_seqadj,
2454 };
2455 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2456
2457 /***********************************************************************
2458 * EXPECT
2459 ***********************************************************************/
2460
2461 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2462 const struct nf_conntrack_tuple *tuple,
2463 u32 type)
2464 {
2465 struct nlattr *nest_parms;
2466
2467 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2468 if (!nest_parms)
2469 goto nla_put_failure;
2470 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2471 goto nla_put_failure;
2472 nla_nest_end(skb, nest_parms);
2473
2474 return 0;
2475
2476 nla_put_failure:
2477 return -1;
2478 }
2479
2480 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2481 const struct nf_conntrack_tuple *tuple,
2482 const struct nf_conntrack_tuple_mask *mask)
2483 {
2484 const struct nf_conntrack_l3proto *l3proto;
2485 const struct nf_conntrack_l4proto *l4proto;
2486 struct nf_conntrack_tuple m;
2487 struct nlattr *nest_parms;
2488 int ret;
2489
2490 memset(&m, 0xFF, sizeof(m));
2491 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2492 m.src.u.all = mask->src.u.all;
2493 m.dst.protonum = tuple->dst.protonum;
2494
2495 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2496 if (!nest_parms)
2497 goto nla_put_failure;
2498
2499 rcu_read_lock();
2500 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2501 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2502 if (ret >= 0) {
2503 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2504 tuple->dst.protonum);
2505 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2506 }
2507 rcu_read_unlock();
2508
2509 if (unlikely(ret < 0))
2510 goto nla_put_failure;
2511
2512 nla_nest_end(skb, nest_parms);
2513
2514 return 0;
2515
2516 nla_put_failure:
2517 return -1;
2518 }
2519
2520 static const union nf_inet_addr any_addr;
2521
2522 static int
2523 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2524 const struct nf_conntrack_expect *exp)
2525 {
2526 struct nf_conn *master = exp->master;
2527 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2528 struct nf_conn_help *help;
2529 #ifdef CONFIG_NF_NAT_NEEDED
2530 struct nlattr *nest_parms;
2531 struct nf_conntrack_tuple nat_tuple = {};
2532 #endif
2533 struct nf_ct_helper_expectfn *expfn;
2534
2535 if (timeout < 0)
2536 timeout = 0;
2537
2538 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2539 goto nla_put_failure;
2540 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2541 goto nla_put_failure;
2542 if (ctnetlink_exp_dump_tuple(skb,
2543 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2544 CTA_EXPECT_MASTER) < 0)
2545 goto nla_put_failure;
2546
2547 #ifdef CONFIG_NF_NAT_NEEDED
2548 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2549 exp->saved_proto.all) {
2550 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2551 if (!nest_parms)
2552 goto nla_put_failure;
2553
2554 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2555 goto nla_put_failure;
2556
2557 nat_tuple.src.l3num = nf_ct_l3num(master);
2558 nat_tuple.src.u3 = exp->saved_addr;
2559 nat_tuple.dst.protonum = nf_ct_protonum(master);
2560 nat_tuple.src.u = exp->saved_proto;
2561
2562 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2563 CTA_EXPECT_NAT_TUPLE) < 0)
2564 goto nla_put_failure;
2565 nla_nest_end(skb, nest_parms);
2566 }
2567 #endif
2568 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2569 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2570 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2571 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2572 goto nla_put_failure;
2573 help = nfct_help(master);
2574 if (help) {
2575 struct nf_conntrack_helper *helper;
2576
2577 helper = rcu_dereference(help->helper);
2578 if (helper &&
2579 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2580 goto nla_put_failure;
2581 }
2582 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2583 if (expfn != NULL &&
2584 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2585 goto nla_put_failure;
2586
2587 return 0;
2588
2589 nla_put_failure:
2590 return -1;
2591 }
2592
2593 static int
2594 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2595 int event, const struct nf_conntrack_expect *exp)
2596 {
2597 struct nlmsghdr *nlh;
2598 struct nfgenmsg *nfmsg;
2599 unsigned int flags = portid ? NLM_F_MULTI : 0;
2600
2601 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
2602 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2603 if (nlh == NULL)
2604 goto nlmsg_failure;
2605
2606 nfmsg = nlmsg_data(nlh);
2607 nfmsg->nfgen_family = exp->tuple.src.l3num;
2608 nfmsg->version = NFNETLINK_V0;
2609 nfmsg->res_id = 0;
2610
2611 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2612 goto nla_put_failure;
2613
2614 nlmsg_end(skb, nlh);
2615 return skb->len;
2616
2617 nlmsg_failure:
2618 nla_put_failure:
2619 nlmsg_cancel(skb, nlh);
2620 return -1;
2621 }
2622
2623 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2624 static int
2625 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2626 {
2627 struct nf_conntrack_expect *exp = item->exp;
2628 struct net *net = nf_ct_exp_net(exp);
2629 struct nlmsghdr *nlh;
2630 struct nfgenmsg *nfmsg;
2631 struct sk_buff *skb;
2632 unsigned int type, group;
2633 int flags = 0;
2634
2635 if (events & (1 << IPEXP_DESTROY)) {
2636 type = IPCTNL_MSG_EXP_DELETE;
2637 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2638 } else if (events & (1 << IPEXP_NEW)) {
2639 type = IPCTNL_MSG_EXP_NEW;
2640 flags = NLM_F_CREATE|NLM_F_EXCL;
2641 group = NFNLGRP_CONNTRACK_EXP_NEW;
2642 } else
2643 return 0;
2644
2645 if (!item->report && !nfnetlink_has_listeners(net, group))
2646 return 0;
2647
2648 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2649 if (skb == NULL)
2650 goto errout;
2651
2652 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
2653 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2654 if (nlh == NULL)
2655 goto nlmsg_failure;
2656
2657 nfmsg = nlmsg_data(nlh);
2658 nfmsg->nfgen_family = exp->tuple.src.l3num;
2659 nfmsg->version = NFNETLINK_V0;
2660 nfmsg->res_id = 0;
2661
2662 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2663 goto nla_put_failure;
2664
2665 nlmsg_end(skb, nlh);
2666 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2667 return 0;
2668
2669 nla_put_failure:
2670 nlmsg_cancel(skb, nlh);
2671 nlmsg_failure:
2672 kfree_skb(skb);
2673 errout:
2674 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2675 return 0;
2676 }
2677 #endif
2678 static int ctnetlink_exp_done(struct netlink_callback *cb)
2679 {
2680 if (cb->args[1])
2681 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2682 return 0;
2683 }
2684
2685 static int
2686 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2687 {
2688 struct net *net = sock_net(skb->sk);
2689 struct nf_conntrack_expect *exp, *last;
2690 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2691 u_int8_t l3proto = nfmsg->nfgen_family;
2692
2693 rcu_read_lock();
2694 last = (struct nf_conntrack_expect *)cb->args[1];
2695 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2696 restart:
2697 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
2698 hnode) {
2699 if (l3proto && exp->tuple.src.l3num != l3proto)
2700 continue;
2701
2702 if (!net_eq(nf_ct_net(exp->master), net))
2703 continue;
2704
2705 if (cb->args[1]) {
2706 if (exp != last)
2707 continue;
2708 cb->args[1] = 0;
2709 }
2710 if (ctnetlink_exp_fill_info(skb,
2711 NETLINK_CB(cb->skb).portid,
2712 cb->nlh->nlmsg_seq,
2713 IPCTNL_MSG_EXP_NEW,
2714 exp) < 0) {
2715 if (!refcount_inc_not_zero(&exp->use))
2716 continue;
2717 cb->args[1] = (unsigned long)exp;
2718 goto out;
2719 }
2720 }
2721 if (cb->args[1]) {
2722 cb->args[1] = 0;
2723 goto restart;
2724 }
2725 }
2726 out:
2727 rcu_read_unlock();
2728 if (last)
2729 nf_ct_expect_put(last);
2730
2731 return skb->len;
2732 }
2733
2734 static int
2735 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2736 {
2737 struct nf_conntrack_expect *exp, *last;
2738 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2739 struct nf_conn *ct = cb->data;
2740 struct nf_conn_help *help = nfct_help(ct);
2741 u_int8_t l3proto = nfmsg->nfgen_family;
2742
2743 if (cb->args[0])
2744 return 0;
2745
2746 rcu_read_lock();
2747 last = (struct nf_conntrack_expect *)cb->args[1];
2748 restart:
2749 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
2750 if (l3proto && exp->tuple.src.l3num != l3proto)
2751 continue;
2752 if (cb->args[1]) {
2753 if (exp != last)
2754 continue;
2755 cb->args[1] = 0;
2756 }
2757 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2758 cb->nlh->nlmsg_seq,
2759 IPCTNL_MSG_EXP_NEW,
2760 exp) < 0) {
2761 if (!refcount_inc_not_zero(&exp->use))
2762 continue;
2763 cb->args[1] = (unsigned long)exp;
2764 goto out;
2765 }
2766 }
2767 if (cb->args[1]) {
2768 cb->args[1] = 0;
2769 goto restart;
2770 }
2771 cb->args[0] = 1;
2772 out:
2773 rcu_read_unlock();
2774 if (last)
2775 nf_ct_expect_put(last);
2776
2777 return skb->len;
2778 }
2779
2780 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
2781 struct sk_buff *skb,
2782 const struct nlmsghdr *nlh,
2783 const struct nlattr * const cda[],
2784 struct netlink_ext_ack *extack)
2785 {
2786 int err;
2787 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2788 u_int8_t u3 = nfmsg->nfgen_family;
2789 struct nf_conntrack_tuple tuple;
2790 struct nf_conntrack_tuple_hash *h;
2791 struct nf_conn *ct;
2792 struct nf_conntrack_zone zone;
2793 struct netlink_dump_control c = {
2794 .dump = ctnetlink_exp_ct_dump_table,
2795 .done = ctnetlink_exp_done,
2796 };
2797
2798 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2799 u3, NULL);
2800 if (err < 0)
2801 return err;
2802
2803 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2804 if (err < 0)
2805 return err;
2806
2807 h = nf_conntrack_find_get(net, &zone, &tuple);
2808 if (!h)
2809 return -ENOENT;
2810
2811 ct = nf_ct_tuplehash_to_ctrack(h);
2812 /* No expectation linked to this connection tracking. */
2813 if (!nfct_help(ct)) {
2814 nf_ct_put(ct);
2815 return 0;
2816 }
2817
2818 c.data = ct;
2819
2820 err = netlink_dump_start(ctnl, skb, nlh, &c);
2821 nf_ct_put(ct);
2822
2823 return err;
2824 }
2825
2826 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
2827 struct sk_buff *skb, const struct nlmsghdr *nlh,
2828 const struct nlattr * const cda[],
2829 struct netlink_ext_ack *extack)
2830 {
2831 struct nf_conntrack_tuple tuple;
2832 struct nf_conntrack_expect *exp;
2833 struct sk_buff *skb2;
2834 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2835 u_int8_t u3 = nfmsg->nfgen_family;
2836 struct nf_conntrack_zone zone;
2837 int err;
2838
2839 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2840 if (cda[CTA_EXPECT_MASTER])
2841 return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda,
2842 extack);
2843 else {
2844 struct netlink_dump_control c = {
2845 .dump = ctnetlink_exp_dump_table,
2846 .done = ctnetlink_exp_done,
2847 };
2848 return netlink_dump_start(ctnl, skb, nlh, &c);
2849 }
2850 }
2851
2852 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2853 if (err < 0)
2854 return err;
2855
2856 if (cda[CTA_EXPECT_TUPLE])
2857 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2858 u3, NULL);
2859 else if (cda[CTA_EXPECT_MASTER])
2860 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2861 u3, NULL);
2862 else
2863 return -EINVAL;
2864
2865 if (err < 0)
2866 return err;
2867
2868 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2869 if (!exp)
2870 return -ENOENT;
2871
2872 if (cda[CTA_EXPECT_ID]) {
2873 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2874 if (ntohl(id) != (u32)(unsigned long)exp) {
2875 nf_ct_expect_put(exp);
2876 return -ENOENT;
2877 }
2878 }
2879
2880 err = -ENOMEM;
2881 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2882 if (skb2 == NULL) {
2883 nf_ct_expect_put(exp);
2884 goto out;
2885 }
2886
2887 rcu_read_lock();
2888 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2889 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2890 rcu_read_unlock();
2891 nf_ct_expect_put(exp);
2892 if (err <= 0)
2893 goto free;
2894
2895 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2896 if (err < 0)
2897 goto out;
2898
2899 return 0;
2900
2901 free:
2902 kfree_skb(skb2);
2903 out:
2904 /* this avoids a loop in nfnetlink. */
2905 return err == -EAGAIN ? -ENOBUFS : err;
2906 }
2907
2908 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
2909 {
2910 const struct nf_conn_help *m_help;
2911 const char *name = data;
2912
2913 m_help = nfct_help(exp->master);
2914
2915 return strcmp(m_help->helper->name, name) == 0;
2916 }
2917
2918 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
2919 {
2920 return true;
2921 }
2922
2923 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
2924 struct sk_buff *skb, const struct nlmsghdr *nlh,
2925 const struct nlattr * const cda[],
2926 struct netlink_ext_ack *extack)
2927 {
2928 struct nf_conntrack_expect *exp;
2929 struct nf_conntrack_tuple tuple;
2930 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2931 u_int8_t u3 = nfmsg->nfgen_family;
2932 struct nf_conntrack_zone zone;
2933 int err;
2934
2935 if (cda[CTA_EXPECT_TUPLE]) {
2936 /* delete a single expect by tuple */
2937 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2938 if (err < 0)
2939 return err;
2940
2941 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2942 u3, NULL);
2943 if (err < 0)
2944 return err;
2945
2946 /* bump usage count to 2 */
2947 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2948 if (!exp)
2949 return -ENOENT;
2950
2951 if (cda[CTA_EXPECT_ID]) {
2952 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2953 if (ntohl(id) != (u32)(unsigned long)exp) {
2954 nf_ct_expect_put(exp);
2955 return -ENOENT;
2956 }
2957 }
2958
2959 /* after list removal, usage count == 1 */
2960 spin_lock_bh(&nf_conntrack_expect_lock);
2961 if (del_timer(&exp->timeout)) {
2962 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2963 nlmsg_report(nlh));
2964 nf_ct_expect_put(exp);
2965 }
2966 spin_unlock_bh(&nf_conntrack_expect_lock);
2967 /* have to put what we 'get' above.
2968 * after this line usage count == 0 */
2969 nf_ct_expect_put(exp);
2970 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2971 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2972
2973 nf_ct_expect_iterate_net(net, expect_iter_name, name,
2974 NETLINK_CB(skb).portid,
2975 nlmsg_report(nlh));
2976 } else {
2977 /* This basically means we have to flush everything*/
2978 nf_ct_expect_iterate_net(net, expect_iter_all, NULL,
2979 NETLINK_CB(skb).portid,
2980 nlmsg_report(nlh));
2981 }
2982
2983 return 0;
2984 }
2985 static int
2986 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2987 const struct nlattr * const cda[])
2988 {
2989 if (cda[CTA_EXPECT_TIMEOUT]) {
2990 if (!del_timer(&x->timeout))
2991 return -ETIME;
2992
2993 x->timeout.expires = jiffies +
2994 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2995 add_timer(&x->timeout);
2996 }
2997 return 0;
2998 }
2999
3000 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3001 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3002 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3003 };
3004
3005 static int
3006 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3007 struct nf_conntrack_expect *exp,
3008 u_int8_t u3)
3009 {
3010 #ifdef CONFIG_NF_NAT_NEEDED
3011 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3012 struct nf_conntrack_tuple nat_tuple = {};
3013 int err;
3014
3015 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr,
3016 exp_nat_nla_policy, NULL);
3017 if (err < 0)
3018 return err;
3019
3020 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3021 return -EINVAL;
3022
3023 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3024 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3025 u3, NULL);
3026 if (err < 0)
3027 return err;
3028
3029 exp->saved_addr = nat_tuple.src.u3;
3030 exp->saved_proto = nat_tuple.src.u;
3031 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3032
3033 return 0;
3034 #else
3035 return -EOPNOTSUPP;
3036 #endif
3037 }
3038
3039 static struct nf_conntrack_expect *
3040 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3041 struct nf_conntrack_helper *helper,
3042 struct nf_conntrack_tuple *tuple,
3043 struct nf_conntrack_tuple *mask)
3044 {
3045 u_int32_t class = 0;
3046 struct nf_conntrack_expect *exp;
3047 struct nf_conn_help *help;
3048 int err;
3049
3050 help = nfct_help(ct);
3051 if (!help)
3052 return ERR_PTR(-EOPNOTSUPP);
3053
3054 if (cda[CTA_EXPECT_CLASS] && helper) {
3055 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3056 if (class > helper->expect_class_max)
3057 return ERR_PTR(-EINVAL);
3058 }
3059 exp = nf_ct_expect_alloc(ct);
3060 if (!exp)
3061 return ERR_PTR(-ENOMEM);
3062
3063 if (cda[CTA_EXPECT_FLAGS]) {
3064 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3065 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3066 } else {
3067 exp->flags = 0;
3068 }
3069 if (cda[CTA_EXPECT_FN]) {
3070 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3071 struct nf_ct_helper_expectfn *expfn;
3072
3073 expfn = nf_ct_helper_expectfn_find_by_name(name);
3074 if (expfn == NULL) {
3075 err = -EINVAL;
3076 goto err_out;
3077 }
3078 exp->expectfn = expfn->expectfn;
3079 } else
3080 exp->expectfn = NULL;
3081
3082 exp->class = class;
3083 exp->master = ct;
3084 exp->helper = helper;
3085 exp->tuple = *tuple;
3086 exp->mask.src.u3 = mask->src.u3;
3087 exp->mask.src.u.all = mask->src.u.all;
3088
3089 if (cda[CTA_EXPECT_NAT]) {
3090 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3091 exp, nf_ct_l3num(ct));
3092 if (err < 0)
3093 goto err_out;
3094 }
3095 return exp;
3096 err_out:
3097 nf_ct_expect_put(exp);
3098 return ERR_PTR(err);
3099 }
3100
3101 static int
3102 ctnetlink_create_expect(struct net *net,
3103 const struct nf_conntrack_zone *zone,
3104 const struct nlattr * const cda[],
3105 u_int8_t u3, u32 portid, int report)
3106 {
3107 struct nf_conntrack_tuple tuple, mask, master_tuple;
3108 struct nf_conntrack_tuple_hash *h = NULL;
3109 struct nf_conntrack_helper *helper = NULL;
3110 struct nf_conntrack_expect *exp;
3111 struct nf_conn *ct;
3112 int err;
3113
3114 /* caller guarantees that those three CTA_EXPECT_* exist */
3115 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3116 u3, NULL);
3117 if (err < 0)
3118 return err;
3119 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3120 u3, NULL);
3121 if (err < 0)
3122 return err;
3123 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3124 u3, NULL);
3125 if (err < 0)
3126 return err;
3127
3128 /* Look for master conntrack of this expectation */
3129 h = nf_conntrack_find_get(net, zone, &master_tuple);
3130 if (!h)
3131 return -ENOENT;
3132 ct = nf_ct_tuplehash_to_ctrack(h);
3133
3134 rcu_read_lock();
3135 if (cda[CTA_EXPECT_HELP_NAME]) {
3136 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3137
3138 helper = __nf_conntrack_helper_find(helpname, u3,
3139 nf_ct_protonum(ct));
3140 if (helper == NULL) {
3141 rcu_read_unlock();
3142 #ifdef CONFIG_MODULES
3143 if (request_module("nfct-helper-%s", helpname) < 0) {
3144 err = -EOPNOTSUPP;
3145 goto err_ct;
3146 }
3147 rcu_read_lock();
3148 helper = __nf_conntrack_helper_find(helpname, u3,
3149 nf_ct_protonum(ct));
3150 if (helper) {
3151 err = -EAGAIN;
3152 goto err_rcu;
3153 }
3154 rcu_read_unlock();
3155 #endif
3156 err = -EOPNOTSUPP;
3157 goto err_ct;
3158 }
3159 }
3160
3161 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3162 if (IS_ERR(exp)) {
3163 err = PTR_ERR(exp);
3164 goto err_rcu;
3165 }
3166
3167 err = nf_ct_expect_related_report(exp, portid, report);
3168 nf_ct_expect_put(exp);
3169 err_rcu:
3170 rcu_read_unlock();
3171 err_ct:
3172 nf_ct_put(ct);
3173 return err;
3174 }
3175
3176 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3177 struct sk_buff *skb, const struct nlmsghdr *nlh,
3178 const struct nlattr * const cda[],
3179 struct netlink_ext_ack *extack)
3180 {
3181 struct nf_conntrack_tuple tuple;
3182 struct nf_conntrack_expect *exp;
3183 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3184 u_int8_t u3 = nfmsg->nfgen_family;
3185 struct nf_conntrack_zone zone;
3186 int err;
3187
3188 if (!cda[CTA_EXPECT_TUPLE]
3189 || !cda[CTA_EXPECT_MASK]
3190 || !cda[CTA_EXPECT_MASTER])
3191 return -EINVAL;
3192
3193 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3194 if (err < 0)
3195 return err;
3196
3197 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3198 u3, NULL);
3199 if (err < 0)
3200 return err;
3201
3202 spin_lock_bh(&nf_conntrack_expect_lock);
3203 exp = __nf_ct_expect_find(net, &zone, &tuple);
3204 if (!exp) {
3205 spin_unlock_bh(&nf_conntrack_expect_lock);
3206 err = -ENOENT;
3207 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3208 err = ctnetlink_create_expect(net, &zone, cda, u3,
3209 NETLINK_CB(skb).portid,
3210 nlmsg_report(nlh));
3211 }
3212 return err;
3213 }
3214
3215 err = -EEXIST;
3216 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3217 err = ctnetlink_change_expect(exp, cda);
3218 spin_unlock_bh(&nf_conntrack_expect_lock);
3219
3220 return err;
3221 }
3222
3223 static int
3224 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3225 const struct ip_conntrack_stat *st)
3226 {
3227 struct nlmsghdr *nlh;
3228 struct nfgenmsg *nfmsg;
3229 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3230
3231 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3232 IPCTNL_MSG_EXP_GET_STATS_CPU);
3233 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3234 if (nlh == NULL)
3235 goto nlmsg_failure;
3236
3237 nfmsg = nlmsg_data(nlh);
3238 nfmsg->nfgen_family = AF_UNSPEC;
3239 nfmsg->version = NFNETLINK_V0;
3240 nfmsg->res_id = htons(cpu);
3241
3242 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3243 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3244 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3245 goto nla_put_failure;
3246
3247 nlmsg_end(skb, nlh);
3248 return skb->len;
3249
3250 nla_put_failure:
3251 nlmsg_failure:
3252 nlmsg_cancel(skb, nlh);
3253 return -1;
3254 }
3255
3256 static int
3257 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3258 {
3259 int cpu;
3260 struct net *net = sock_net(skb->sk);
3261
3262 if (cb->args[0] == nr_cpu_ids)
3263 return 0;
3264
3265 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3266 const struct ip_conntrack_stat *st;
3267
3268 if (!cpu_possible(cpu))
3269 continue;
3270
3271 st = per_cpu_ptr(net->ct.stat, cpu);
3272 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3273 cb->nlh->nlmsg_seq,
3274 cpu, st) < 0)
3275 break;
3276 }
3277 cb->args[0] = cpu;
3278
3279 return skb->len;
3280 }
3281
3282 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3283 struct sk_buff *skb,
3284 const struct nlmsghdr *nlh,
3285 const struct nlattr * const cda[],
3286 struct netlink_ext_ack *extack)
3287 {
3288 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3289 struct netlink_dump_control c = {
3290 .dump = ctnetlink_exp_stat_cpu_dump,
3291 };
3292 return netlink_dump_start(ctnl, skb, nlh, &c);
3293 }
3294
3295 return 0;
3296 }
3297
3298 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3299 static struct nf_ct_event_notifier ctnl_notifier = {
3300 .fcn = ctnetlink_conntrack_event,
3301 };
3302
3303 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3304 .fcn = ctnetlink_expect_event,
3305 };
3306 #endif
3307
3308 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3309 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3310 .attr_count = CTA_MAX,
3311 .policy = ct_nla_policy },
3312 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3313 .attr_count = CTA_MAX,
3314 .policy = ct_nla_policy },
3315 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3316 .attr_count = CTA_MAX,
3317 .policy = ct_nla_policy },
3318 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3319 .attr_count = CTA_MAX,
3320 .policy = ct_nla_policy },
3321 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3322 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3323 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3324 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3325 };
3326
3327 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3328 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3329 .attr_count = CTA_EXPECT_MAX,
3330 .policy = exp_nla_policy },
3331 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3332 .attr_count = CTA_EXPECT_MAX,
3333 .policy = exp_nla_policy },
3334 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3335 .attr_count = CTA_EXPECT_MAX,
3336 .policy = exp_nla_policy },
3337 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3338 };
3339
3340 static const struct nfnetlink_subsystem ctnl_subsys = {
3341 .name = "conntrack",
3342 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3343 .cb_count = IPCTNL_MSG_MAX,
3344 .cb = ctnl_cb,
3345 };
3346
3347 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3348 .name = "conntrack_expect",
3349 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3350 .cb_count = IPCTNL_MSG_EXP_MAX,
3351 .cb = ctnl_exp_cb,
3352 };
3353
3354 MODULE_ALIAS("ip_conntrack_netlink");
3355 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3356 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3357
3358 static int __net_init ctnetlink_net_init(struct net *net)
3359 {
3360 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3361 int ret;
3362
3363 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3364 if (ret < 0) {
3365 pr_err("ctnetlink_init: cannot register notifier.\n");
3366 goto err_out;
3367 }
3368
3369 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3370 if (ret < 0) {
3371 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3372 goto err_unreg_notifier;
3373 }
3374 #endif
3375 return 0;
3376
3377 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3378 err_unreg_notifier:
3379 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3380 err_out:
3381 return ret;
3382 #endif
3383 }
3384
3385 static void ctnetlink_net_exit(struct net *net)
3386 {
3387 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3388 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3389 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3390 #endif
3391 }
3392
3393 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3394 {
3395 struct net *net;
3396
3397 list_for_each_entry(net, net_exit_list, exit_list)
3398 ctnetlink_net_exit(net);
3399 }
3400
3401 static struct pernet_operations ctnetlink_net_ops = {
3402 .init = ctnetlink_net_init,
3403 .exit_batch = ctnetlink_net_exit_batch,
3404 };
3405
3406 static int __init ctnetlink_init(void)
3407 {
3408 int ret;
3409
3410 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3411 ret = nfnetlink_subsys_register(&ctnl_subsys);
3412 if (ret < 0) {
3413 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3414 goto err_out;
3415 }
3416
3417 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3418 if (ret < 0) {
3419 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3420 goto err_unreg_subsys;
3421 }
3422
3423 ret = register_pernet_subsys(&ctnetlink_net_ops);
3424 if (ret < 0) {
3425 pr_err("ctnetlink_init: cannot register pernet operations\n");
3426 goto err_unreg_exp_subsys;
3427 }
3428 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3429 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3430 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3431 #endif
3432 return 0;
3433
3434 err_unreg_exp_subsys:
3435 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3436 err_unreg_subsys:
3437 nfnetlink_subsys_unregister(&ctnl_subsys);
3438 err_out:
3439 return ret;
3440 }
3441
3442 static void __exit ctnetlink_exit(void)
3443 {
3444 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3445
3446 unregister_pernet_subsys(&ctnetlink_net_ops);
3447 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3448 nfnetlink_subsys_unregister(&ctnl_subsys);
3449 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3450 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3451 #endif
3452 synchronize_rcu();
3453 }
3454
3455 module_init(ctnetlink_init);
3456 module_exit(ctnetlink_exit);
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