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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[deliverable/linux.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 #ifdef CONFIG_NF_NAT_NEEDED
49 #include <net/netfilter/nf_nat_core.h>
50 #include <net/netfilter/nf_nat_l4proto.h>
51 #include <net/netfilter/nf_nat_helper.h>
52 #endif
53
54 #include <linux/netfilter/nfnetlink.h>
55 #include <linux/netfilter/nfnetlink_conntrack.h>
56
57 MODULE_LICENSE("GPL");
58
59 static char __initdata version[] = "0.93";
60
61 static inline int
62 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
63 const struct nf_conntrack_tuple *tuple,
64 struct nf_conntrack_l4proto *l4proto)
65 {
66 int ret = 0;
67 struct nlattr *nest_parms;
68
69 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
70 if (!nest_parms)
71 goto nla_put_failure;
72 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
73 goto nla_put_failure;
74
75 if (likely(l4proto->tuple_to_nlattr))
76 ret = l4proto->tuple_to_nlattr(skb, tuple);
77
78 nla_nest_end(skb, nest_parms);
79
80 return ret;
81
82 nla_put_failure:
83 return -1;
84 }
85
86 static inline int
87 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
88 const struct nf_conntrack_tuple *tuple,
89 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
110 ctnetlink_dump_tuples(struct sk_buff *skb,
111 const struct nf_conntrack_tuple *tuple)
112 {
113 int ret;
114 struct nf_conntrack_l3proto *l3proto;
115 struct nf_conntrack_l4proto *l4proto;
116
117 rcu_read_lock();
118 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
119 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
120
121 if (ret >= 0) {
122 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
123 tuple->dst.protonum);
124 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
125 }
126 rcu_read_unlock();
127 return ret;
128 }
129
130 static inline int
131 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
132 {
133 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
134 goto nla_put_failure;
135 return 0;
136
137 nla_put_failure:
138 return -1;
139 }
140
141 static inline int
142 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
143 {
144 long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
145
146 if (timeout < 0)
147 timeout = 0;
148
149 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
150 goto nla_put_failure;
151 return 0;
152
153 nla_put_failure:
154 return -1;
155 }
156
157 static inline int
158 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
159 {
160 struct nf_conntrack_l4proto *l4proto;
161 struct nlattr *nest_proto;
162 int ret;
163
164 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
165 if (!l4proto->to_nlattr)
166 return 0;
167
168 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
169 if (!nest_proto)
170 goto nla_put_failure;
171
172 ret = l4proto->to_nlattr(skb, nest_proto, ct);
173
174 nla_nest_end(skb, nest_proto);
175
176 return ret;
177
178 nla_put_failure:
179 return -1;
180 }
181
182 static inline int
183 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
184 {
185 struct nlattr *nest_helper;
186 const struct nf_conn_help *help = nfct_help(ct);
187 struct nf_conntrack_helper *helper;
188
189 if (!help)
190 return 0;
191
192 helper = rcu_dereference(help->helper);
193 if (!helper)
194 goto out;
195
196 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
197 if (!nest_helper)
198 goto nla_put_failure;
199 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
200 goto nla_put_failure;
201
202 if (helper->to_nlattr)
203 helper->to_nlattr(skb, ct);
204
205 nla_nest_end(skb, nest_helper);
206 out:
207 return 0;
208
209 nla_put_failure:
210 return -1;
211 }
212
213 static int
214 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
215 enum ip_conntrack_dir dir, int type)
216 {
217 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
218 struct nf_conn_counter *counter = acct->counter;
219 struct nlattr *nest_count;
220 u64 pkts, bytes;
221
222 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
223 pkts = atomic64_xchg(&counter[dir].packets, 0);
224 bytes = atomic64_xchg(&counter[dir].bytes, 0);
225 } else {
226 pkts = atomic64_read(&counter[dir].packets);
227 bytes = atomic64_read(&counter[dir].bytes);
228 }
229
230 nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
231 if (!nest_count)
232 goto nla_put_failure;
233
234 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts)) ||
235 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes)))
236 goto nla_put_failure;
237
238 nla_nest_end(skb, nest_count);
239
240 return 0;
241
242 nla_put_failure:
243 return -1;
244 }
245
246 static int
247 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
248 {
249 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
250
251 if (!acct)
252 return 0;
253
254 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
255 return -1;
256 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
257 return -1;
258
259 return 0;
260 }
261
262 static int
263 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
264 {
265 struct nlattr *nest_count;
266 const struct nf_conn_tstamp *tstamp;
267
268 tstamp = nf_conn_tstamp_find(ct);
269 if (!tstamp)
270 return 0;
271
272 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
273 if (!nest_count)
274 goto nla_put_failure;
275
276 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start)) ||
277 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
278 cpu_to_be64(tstamp->stop))))
279 goto nla_put_failure;
280 nla_nest_end(skb, nest_count);
281
282 return 0;
283
284 nla_put_failure:
285 return -1;
286 }
287
288 #ifdef CONFIG_NF_CONNTRACK_MARK
289 static inline int
290 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
291 {
292 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
293 goto nla_put_failure;
294 return 0;
295
296 nla_put_failure:
297 return -1;
298 }
299 #else
300 #define ctnetlink_dump_mark(a, b) (0)
301 #endif
302
303 #ifdef CONFIG_NF_CONNTRACK_SECMARK
304 static inline int
305 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
306 {
307 struct nlattr *nest_secctx;
308 int len, ret;
309 char *secctx;
310
311 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
312 if (ret)
313 return 0;
314
315 ret = -1;
316 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
317 if (!nest_secctx)
318 goto nla_put_failure;
319
320 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
321 goto nla_put_failure;
322 nla_nest_end(skb, nest_secctx);
323
324 ret = 0;
325 nla_put_failure:
326 security_release_secctx(secctx, len);
327 return ret;
328 }
329 #else
330 #define ctnetlink_dump_secctx(a, b) (0)
331 #endif
332
333 #ifdef CONFIG_NF_CONNTRACK_LABELS
334 static int ctnetlink_label_size(const struct nf_conn *ct)
335 {
336 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
337
338 if (!labels)
339 return 0;
340 return nla_total_size(labels->words * sizeof(long));
341 }
342
343 static int
344 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
345 {
346 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
347 unsigned int len, i;
348
349 if (!labels)
350 return 0;
351
352 len = labels->words * sizeof(long);
353 i = 0;
354 do {
355 if (labels->bits[i] != 0)
356 return nla_put(skb, CTA_LABELS, len, labels->bits);
357 i++;
358 } while (i < labels->words);
359
360 return 0;
361 }
362 #else
363 #define ctnetlink_dump_labels(a, b) (0)
364 #define ctnetlink_label_size(a) (0)
365 #endif
366
367 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
368
369 static inline int
370 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
371 {
372 struct nlattr *nest_parms;
373
374 if (!(ct->status & IPS_EXPECTED))
375 return 0;
376
377 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
378 if (!nest_parms)
379 goto nla_put_failure;
380 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
381 goto nla_put_failure;
382 nla_nest_end(skb, nest_parms);
383
384 return 0;
385
386 nla_put_failure:
387 return -1;
388 }
389
390 static int
391 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
392 {
393 struct nlattr *nest_parms;
394
395 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
396 if (!nest_parms)
397 goto nla_put_failure;
398
399 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
400 htonl(seq->correction_pos)) ||
401 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
402 htonl(seq->offset_before)) ||
403 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
404 htonl(seq->offset_after)))
405 goto nla_put_failure;
406
407 nla_nest_end(skb, nest_parms);
408
409 return 0;
410
411 nla_put_failure:
412 return -1;
413 }
414
415 static inline int
416 ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
417 {
418 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
419 struct nf_ct_seqadj *seq;
420
421 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
422 return 0;
423
424 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
425 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
426 return -1;
427
428 seq = &seqadj->seq[IP_CT_DIR_REPLY];
429 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
430 return -1;
431
432 return 0;
433 }
434
435 static inline int
436 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
437 {
438 if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
439 goto nla_put_failure;
440 return 0;
441
442 nla_put_failure:
443 return -1;
444 }
445
446 static inline int
447 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
448 {
449 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
450 goto nla_put_failure;
451 return 0;
452
453 nla_put_failure:
454 return -1;
455 }
456
457 static int
458 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
459 struct nf_conn *ct)
460 {
461 struct nlmsghdr *nlh;
462 struct nfgenmsg *nfmsg;
463 struct nlattr *nest_parms;
464 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
465
466 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
467 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
468 if (nlh == NULL)
469 goto nlmsg_failure;
470
471 nfmsg = nlmsg_data(nlh);
472 nfmsg->nfgen_family = nf_ct_l3num(ct);
473 nfmsg->version = NFNETLINK_V0;
474 nfmsg->res_id = 0;
475
476 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
477 if (!nest_parms)
478 goto nla_put_failure;
479 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
480 goto nla_put_failure;
481 nla_nest_end(skb, nest_parms);
482
483 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
484 if (!nest_parms)
485 goto nla_put_failure;
486 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
487 goto nla_put_failure;
488 nla_nest_end(skb, nest_parms);
489
490 if (nf_ct_zone(ct) &&
491 nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
492 goto nla_put_failure;
493
494 if (ctnetlink_dump_status(skb, ct) < 0 ||
495 ctnetlink_dump_timeout(skb, ct) < 0 ||
496 ctnetlink_dump_acct(skb, ct, type) < 0 ||
497 ctnetlink_dump_timestamp(skb, ct) < 0 ||
498 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
499 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
500 ctnetlink_dump_mark(skb, ct) < 0 ||
501 ctnetlink_dump_secctx(skb, ct) < 0 ||
502 ctnetlink_dump_labels(skb, ct) < 0 ||
503 ctnetlink_dump_id(skb, ct) < 0 ||
504 ctnetlink_dump_use(skb, ct) < 0 ||
505 ctnetlink_dump_master(skb, ct) < 0 ||
506 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
507 goto nla_put_failure;
508
509 nlmsg_end(skb, nlh);
510 return skb->len;
511
512 nlmsg_failure:
513 nla_put_failure:
514 nlmsg_cancel(skb, nlh);
515 return -1;
516 }
517
518 static inline size_t
519 ctnetlink_proto_size(const struct nf_conn *ct)
520 {
521 struct nf_conntrack_l3proto *l3proto;
522 struct nf_conntrack_l4proto *l4proto;
523 size_t len = 0;
524
525 rcu_read_lock();
526 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
527 len += l3proto->nla_size;
528
529 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
530 len += l4proto->nla_size;
531 rcu_read_unlock();
532
533 return len;
534 }
535
536 static inline size_t
537 ctnetlink_acct_size(const struct nf_conn *ct)
538 {
539 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
540 return 0;
541 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
542 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
543 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
544 ;
545 }
546
547 static inline int
548 ctnetlink_secctx_size(const struct nf_conn *ct)
549 {
550 #ifdef CONFIG_NF_CONNTRACK_SECMARK
551 int len, ret;
552
553 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
554 if (ret)
555 return 0;
556
557 return nla_total_size(0) /* CTA_SECCTX */
558 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
559 #else
560 return 0;
561 #endif
562 }
563
564 static inline size_t
565 ctnetlink_timestamp_size(const struct nf_conn *ct)
566 {
567 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
568 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
569 return 0;
570 return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
571 #else
572 return 0;
573 #endif
574 }
575
576 static inline size_t
577 ctnetlink_nlmsg_size(const struct nf_conn *ct)
578 {
579 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
580 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
581 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
582 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
583 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
584 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
585 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
586 + ctnetlink_acct_size(ct)
587 + ctnetlink_timestamp_size(ct)
588 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
589 + nla_total_size(0) /* CTA_PROTOINFO */
590 + nla_total_size(0) /* CTA_HELP */
591 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
592 + ctnetlink_secctx_size(ct)
593 #ifdef CONFIG_NF_NAT_NEEDED
594 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
595 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
596 #endif
597 #ifdef CONFIG_NF_CONNTRACK_MARK
598 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
599 #endif
600 + ctnetlink_proto_size(ct)
601 + ctnetlink_label_size(ct)
602 ;
603 }
604
605 #ifdef CONFIG_NF_CONNTRACK_EVENTS
606 static int
607 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
608 {
609 struct net *net;
610 struct nlmsghdr *nlh;
611 struct nfgenmsg *nfmsg;
612 struct nlattr *nest_parms;
613 struct nf_conn *ct = item->ct;
614 struct sk_buff *skb;
615 unsigned int type;
616 unsigned int flags = 0, group;
617 int err;
618
619 /* ignore our fake conntrack entry */
620 if (nf_ct_is_untracked(ct))
621 return 0;
622
623 if (events & (1 << IPCT_DESTROY)) {
624 type = IPCTNL_MSG_CT_DELETE;
625 group = NFNLGRP_CONNTRACK_DESTROY;
626 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
627 type = IPCTNL_MSG_CT_NEW;
628 flags = NLM_F_CREATE|NLM_F_EXCL;
629 group = NFNLGRP_CONNTRACK_NEW;
630 } else if (events) {
631 type = IPCTNL_MSG_CT_NEW;
632 group = NFNLGRP_CONNTRACK_UPDATE;
633 } else
634 return 0;
635
636 net = nf_ct_net(ct);
637 if (!item->report && !nfnetlink_has_listeners(net, group))
638 return 0;
639
640 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
641 if (skb == NULL)
642 goto errout;
643
644 type |= NFNL_SUBSYS_CTNETLINK << 8;
645 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
646 if (nlh == NULL)
647 goto nlmsg_failure;
648
649 nfmsg = nlmsg_data(nlh);
650 nfmsg->nfgen_family = nf_ct_l3num(ct);
651 nfmsg->version = NFNETLINK_V0;
652 nfmsg->res_id = 0;
653
654 rcu_read_lock();
655 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
656 if (!nest_parms)
657 goto nla_put_failure;
658 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
659 goto nla_put_failure;
660 nla_nest_end(skb, nest_parms);
661
662 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
663 if (!nest_parms)
664 goto nla_put_failure;
665 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
666 goto nla_put_failure;
667 nla_nest_end(skb, nest_parms);
668
669 if (nf_ct_zone(ct) &&
670 nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
671 goto nla_put_failure;
672
673 if (ctnetlink_dump_id(skb, ct) < 0)
674 goto nla_put_failure;
675
676 if (ctnetlink_dump_status(skb, ct) < 0)
677 goto nla_put_failure;
678
679 if (events & (1 << IPCT_DESTROY)) {
680 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
681 ctnetlink_dump_timestamp(skb, ct) < 0)
682 goto nla_put_failure;
683 } else {
684 if (ctnetlink_dump_timeout(skb, ct) < 0)
685 goto nla_put_failure;
686
687 if (events & (1 << IPCT_PROTOINFO)
688 && ctnetlink_dump_protoinfo(skb, ct) < 0)
689 goto nla_put_failure;
690
691 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
692 && ctnetlink_dump_helpinfo(skb, ct) < 0)
693 goto nla_put_failure;
694
695 #ifdef CONFIG_NF_CONNTRACK_SECMARK
696 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
697 && ctnetlink_dump_secctx(skb, ct) < 0)
698 goto nla_put_failure;
699 #endif
700 if (events & (1 << IPCT_LABEL) &&
701 ctnetlink_dump_labels(skb, ct) < 0)
702 goto nla_put_failure;
703
704 if (events & (1 << IPCT_RELATED) &&
705 ctnetlink_dump_master(skb, ct) < 0)
706 goto nla_put_failure;
707
708 if (events & (1 << IPCT_SEQADJ) &&
709 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
710 goto nla_put_failure;
711 }
712
713 #ifdef CONFIG_NF_CONNTRACK_MARK
714 if ((events & (1 << IPCT_MARK) || ct->mark)
715 && ctnetlink_dump_mark(skb, ct) < 0)
716 goto nla_put_failure;
717 #endif
718 rcu_read_unlock();
719
720 nlmsg_end(skb, nlh);
721 err = nfnetlink_send(skb, net, item->portid, group, item->report,
722 GFP_ATOMIC);
723 if (err == -ENOBUFS || err == -EAGAIN)
724 return -ENOBUFS;
725
726 return 0;
727
728 nla_put_failure:
729 rcu_read_unlock();
730 nlmsg_cancel(skb, nlh);
731 nlmsg_failure:
732 kfree_skb(skb);
733 errout:
734 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
735 return -ENOBUFS;
736
737 return 0;
738 }
739 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
740
741 static int ctnetlink_done(struct netlink_callback *cb)
742 {
743 if (cb->args[1])
744 nf_ct_put((struct nf_conn *)cb->args[1]);
745 if (cb->data)
746 kfree(cb->data);
747 return 0;
748 }
749
750 struct ctnetlink_dump_filter {
751 struct {
752 u_int32_t val;
753 u_int32_t mask;
754 } mark;
755 };
756
757 static int
758 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
759 {
760 struct net *net = sock_net(skb->sk);
761 struct nf_conn *ct, *last;
762 struct nf_conntrack_tuple_hash *h;
763 struct hlist_nulls_node *n;
764 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
765 u_int8_t l3proto = nfmsg->nfgen_family;
766 int res;
767 #ifdef CONFIG_NF_CONNTRACK_MARK
768 const struct ctnetlink_dump_filter *filter = cb->data;
769 #endif
770
771 spin_lock_bh(&nf_conntrack_lock);
772 last = (struct nf_conn *)cb->args[1];
773 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
774 restart:
775 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
776 hnnode) {
777 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
778 continue;
779 ct = nf_ct_tuplehash_to_ctrack(h);
780 /* Dump entries of a given L3 protocol number.
781 * If it is not specified, ie. l3proto == 0,
782 * then dump everything. */
783 if (l3proto && nf_ct_l3num(ct) != l3proto)
784 continue;
785 if (cb->args[1]) {
786 if (ct != last)
787 continue;
788 cb->args[1] = 0;
789 }
790 #ifdef CONFIG_NF_CONNTRACK_MARK
791 if (filter && !((ct->mark & filter->mark.mask) ==
792 filter->mark.val)) {
793 continue;
794 }
795 #endif
796 rcu_read_lock();
797 res =
798 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
799 cb->nlh->nlmsg_seq,
800 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
801 ct);
802 rcu_read_unlock();
803 if (res < 0) {
804 nf_conntrack_get(&ct->ct_general);
805 cb->args[1] = (unsigned long)ct;
806 goto out;
807 }
808 }
809 if (cb->args[1]) {
810 cb->args[1] = 0;
811 goto restart;
812 }
813 }
814 out:
815 spin_unlock_bh(&nf_conntrack_lock);
816 if (last)
817 nf_ct_put(last);
818
819 return skb->len;
820 }
821
822 static inline int
823 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
824 {
825 struct nlattr *tb[CTA_IP_MAX+1];
826 struct nf_conntrack_l3proto *l3proto;
827 int ret = 0;
828
829 ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
830 if (ret < 0)
831 return ret;
832
833 rcu_read_lock();
834 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
835
836 if (likely(l3proto->nlattr_to_tuple)) {
837 ret = nla_validate_nested(attr, CTA_IP_MAX,
838 l3proto->nla_policy);
839 if (ret == 0)
840 ret = l3proto->nlattr_to_tuple(tb, tuple);
841 }
842
843 rcu_read_unlock();
844
845 return ret;
846 }
847
848 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
849 [CTA_PROTO_NUM] = { .type = NLA_U8 },
850 };
851
852 static inline int
853 ctnetlink_parse_tuple_proto(struct nlattr *attr,
854 struct nf_conntrack_tuple *tuple)
855 {
856 struct nlattr *tb[CTA_PROTO_MAX+1];
857 struct nf_conntrack_l4proto *l4proto;
858 int ret = 0;
859
860 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
861 if (ret < 0)
862 return ret;
863
864 if (!tb[CTA_PROTO_NUM])
865 return -EINVAL;
866 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
867
868 rcu_read_lock();
869 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
870
871 if (likely(l4proto->nlattr_to_tuple)) {
872 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
873 l4proto->nla_policy);
874 if (ret == 0)
875 ret = l4proto->nlattr_to_tuple(tb, tuple);
876 }
877
878 rcu_read_unlock();
879
880 return ret;
881 }
882
883 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
884 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
885 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
886 };
887
888 static int
889 ctnetlink_parse_tuple(const struct nlattr * const cda[],
890 struct nf_conntrack_tuple *tuple,
891 enum ctattr_type type, u_int8_t l3num)
892 {
893 struct nlattr *tb[CTA_TUPLE_MAX+1];
894 int err;
895
896 memset(tuple, 0, sizeof(*tuple));
897
898 err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
899 if (err < 0)
900 return err;
901
902 if (!tb[CTA_TUPLE_IP])
903 return -EINVAL;
904
905 tuple->src.l3num = l3num;
906
907 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
908 if (err < 0)
909 return err;
910
911 if (!tb[CTA_TUPLE_PROTO])
912 return -EINVAL;
913
914 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
915 if (err < 0)
916 return err;
917
918 /* orig and expect tuples get DIR_ORIGINAL */
919 if (type == CTA_TUPLE_REPLY)
920 tuple->dst.dir = IP_CT_DIR_REPLY;
921 else
922 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
923
924 return 0;
925 }
926
927 static int
928 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
929 {
930 if (attr)
931 #ifdef CONFIG_NF_CONNTRACK_ZONES
932 *zone = ntohs(nla_get_be16(attr));
933 #else
934 return -EOPNOTSUPP;
935 #endif
936 else
937 *zone = 0;
938
939 return 0;
940 }
941
942 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
943 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
944 .len = NF_CT_HELPER_NAME_LEN - 1 },
945 };
946
947 static inline int
948 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
949 struct nlattr **helpinfo)
950 {
951 int err;
952 struct nlattr *tb[CTA_HELP_MAX+1];
953
954 err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
955 if (err < 0)
956 return err;
957
958 if (!tb[CTA_HELP_NAME])
959 return -EINVAL;
960
961 *helper_name = nla_data(tb[CTA_HELP_NAME]);
962
963 if (tb[CTA_HELP_INFO])
964 *helpinfo = tb[CTA_HELP_INFO];
965
966 return 0;
967 }
968
969 #define __CTA_LABELS_MAX_LENGTH ((XT_CONNLABEL_MAXBIT + 1) / BITS_PER_BYTE)
970 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
971 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
972 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
973 [CTA_STATUS] = { .type = NLA_U32 },
974 [CTA_PROTOINFO] = { .type = NLA_NESTED },
975 [CTA_HELP] = { .type = NLA_NESTED },
976 [CTA_NAT_SRC] = { .type = NLA_NESTED },
977 [CTA_TIMEOUT] = { .type = NLA_U32 },
978 [CTA_MARK] = { .type = NLA_U32 },
979 [CTA_ID] = { .type = NLA_U32 },
980 [CTA_NAT_DST] = { .type = NLA_NESTED },
981 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
982 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
983 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
984 [CTA_ZONE] = { .type = NLA_U16 },
985 [CTA_MARK_MASK] = { .type = NLA_U32 },
986 [CTA_LABELS] = { .type = NLA_BINARY,
987 .len = __CTA_LABELS_MAX_LENGTH },
988 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
989 .len = __CTA_LABELS_MAX_LENGTH },
990 };
991
992 static int
993 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
994 const struct nlmsghdr *nlh,
995 const struct nlattr * const cda[])
996 {
997 struct net *net = sock_net(ctnl);
998 struct nf_conntrack_tuple_hash *h;
999 struct nf_conntrack_tuple tuple;
1000 struct nf_conn *ct;
1001 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1002 u_int8_t u3 = nfmsg->nfgen_family;
1003 u16 zone;
1004 int err;
1005
1006 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1007 if (err < 0)
1008 return err;
1009
1010 if (cda[CTA_TUPLE_ORIG])
1011 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1012 else if (cda[CTA_TUPLE_REPLY])
1013 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1014 else {
1015 /* Flush the whole table */
1016 nf_conntrack_flush_report(net,
1017 NETLINK_CB(skb).portid,
1018 nlmsg_report(nlh));
1019 return 0;
1020 }
1021
1022 if (err < 0)
1023 return err;
1024
1025 h = nf_conntrack_find_get(net, zone, &tuple);
1026 if (!h)
1027 return -ENOENT;
1028
1029 ct = nf_ct_tuplehash_to_ctrack(h);
1030
1031 if (cda[CTA_ID]) {
1032 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1033 if (id != (u32)(unsigned long)ct) {
1034 nf_ct_put(ct);
1035 return -ENOENT;
1036 }
1037 }
1038
1039 if (del_timer(&ct->timeout))
1040 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1041
1042 nf_ct_put(ct);
1043
1044 return 0;
1045 }
1046
1047 static int
1048 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
1049 const struct nlmsghdr *nlh,
1050 const struct nlattr * const cda[])
1051 {
1052 struct net *net = sock_net(ctnl);
1053 struct nf_conntrack_tuple_hash *h;
1054 struct nf_conntrack_tuple tuple;
1055 struct nf_conn *ct;
1056 struct sk_buff *skb2 = NULL;
1057 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1058 u_int8_t u3 = nfmsg->nfgen_family;
1059 u16 zone;
1060 int err;
1061
1062 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1063 struct netlink_dump_control c = {
1064 .dump = ctnetlink_dump_table,
1065 .done = ctnetlink_done,
1066 };
1067 #ifdef CONFIG_NF_CONNTRACK_MARK
1068 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1069 struct ctnetlink_dump_filter *filter;
1070
1071 filter = kzalloc(sizeof(struct ctnetlink_dump_filter),
1072 GFP_ATOMIC);
1073 if (filter == NULL)
1074 return -ENOMEM;
1075
1076 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
1077 filter->mark.mask =
1078 ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1079 c.data = filter;
1080 }
1081 #endif
1082 return netlink_dump_start(ctnl, skb, nlh, &c);
1083 }
1084
1085 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1086 if (err < 0)
1087 return err;
1088
1089 if (cda[CTA_TUPLE_ORIG])
1090 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1091 else if (cda[CTA_TUPLE_REPLY])
1092 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1093 else
1094 return -EINVAL;
1095
1096 if (err < 0)
1097 return err;
1098
1099 h = nf_conntrack_find_get(net, zone, &tuple);
1100 if (!h)
1101 return -ENOENT;
1102
1103 ct = nf_ct_tuplehash_to_ctrack(h);
1104
1105 err = -ENOMEM;
1106 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1107 if (skb2 == NULL) {
1108 nf_ct_put(ct);
1109 return -ENOMEM;
1110 }
1111
1112 rcu_read_lock();
1113 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1114 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1115 rcu_read_unlock();
1116 nf_ct_put(ct);
1117 if (err <= 0)
1118 goto free;
1119
1120 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1121 if (err < 0)
1122 goto out;
1123
1124 return 0;
1125
1126 free:
1127 kfree_skb(skb2);
1128 out:
1129 /* this avoids a loop in nfnetlink. */
1130 return err == -EAGAIN ? -ENOBUFS : err;
1131 }
1132
1133 static int ctnetlink_done_list(struct netlink_callback *cb)
1134 {
1135 if (cb->args[1])
1136 nf_ct_put((struct nf_conn *)cb->args[1]);
1137 return 0;
1138 }
1139
1140 static int
1141 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb,
1142 struct hlist_nulls_head *list)
1143 {
1144 struct nf_conn *ct, *last;
1145 struct nf_conntrack_tuple_hash *h;
1146 struct hlist_nulls_node *n;
1147 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1148 u_int8_t l3proto = nfmsg->nfgen_family;
1149 int res;
1150
1151 if (cb->args[2])
1152 return 0;
1153
1154 spin_lock_bh(&nf_conntrack_lock);
1155 last = (struct nf_conn *)cb->args[1];
1156 restart:
1157 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1158 ct = nf_ct_tuplehash_to_ctrack(h);
1159 if (l3proto && nf_ct_l3num(ct) != l3proto)
1160 continue;
1161 if (cb->args[1]) {
1162 if (ct != last)
1163 continue;
1164 cb->args[1] = 0;
1165 }
1166 rcu_read_lock();
1167 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1168 cb->nlh->nlmsg_seq,
1169 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1170 ct);
1171 rcu_read_unlock();
1172 if (res < 0) {
1173 nf_conntrack_get(&ct->ct_general);
1174 cb->args[1] = (unsigned long)ct;
1175 goto out;
1176 }
1177 }
1178 if (cb->args[1]) {
1179 cb->args[1] = 0;
1180 goto restart;
1181 } else
1182 cb->args[2] = 1;
1183 out:
1184 spin_unlock_bh(&nf_conntrack_lock);
1185 if (last)
1186 nf_ct_put(last);
1187
1188 return skb->len;
1189 }
1190
1191 static int
1192 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1193 {
1194 struct net *net = sock_net(skb->sk);
1195
1196 return ctnetlink_dump_list(skb, cb, &net->ct.dying);
1197 }
1198
1199 static int
1200 ctnetlink_get_ct_dying(struct sock *ctnl, struct sk_buff *skb,
1201 const struct nlmsghdr *nlh,
1202 const struct nlattr * const cda[])
1203 {
1204 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1205 struct netlink_dump_control c = {
1206 .dump = ctnetlink_dump_dying,
1207 .done = ctnetlink_done_list,
1208 };
1209 return netlink_dump_start(ctnl, skb, nlh, &c);
1210 }
1211
1212 return -EOPNOTSUPP;
1213 }
1214
1215 static int
1216 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1217 {
1218 struct net *net = sock_net(skb->sk);
1219
1220 return ctnetlink_dump_list(skb, cb, &net->ct.unconfirmed);
1221 }
1222
1223 static int
1224 ctnetlink_get_ct_unconfirmed(struct sock *ctnl, struct sk_buff *skb,
1225 const struct nlmsghdr *nlh,
1226 const struct nlattr * const cda[])
1227 {
1228 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1229 struct netlink_dump_control c = {
1230 .dump = ctnetlink_dump_unconfirmed,
1231 .done = ctnetlink_done_list,
1232 };
1233 return netlink_dump_start(ctnl, skb, nlh, &c);
1234 }
1235
1236 return -EOPNOTSUPP;
1237 }
1238
1239 #ifdef CONFIG_NF_NAT_NEEDED
1240 static int
1241 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1242 enum nf_nat_manip_type manip,
1243 const struct nlattr *attr)
1244 {
1245 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1246 int err;
1247
1248 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1249 if (!parse_nat_setup) {
1250 #ifdef CONFIG_MODULES
1251 rcu_read_unlock();
1252 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1253 if (request_module("nf-nat") < 0) {
1254 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1255 rcu_read_lock();
1256 return -EOPNOTSUPP;
1257 }
1258 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1259 rcu_read_lock();
1260 if (nfnetlink_parse_nat_setup_hook)
1261 return -EAGAIN;
1262 #endif
1263 return -EOPNOTSUPP;
1264 }
1265
1266 err = parse_nat_setup(ct, manip, attr);
1267 if (err == -EAGAIN) {
1268 #ifdef CONFIG_MODULES
1269 rcu_read_unlock();
1270 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1271 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1272 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1273 rcu_read_lock();
1274 return -EOPNOTSUPP;
1275 }
1276 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1277 rcu_read_lock();
1278 #else
1279 err = -EOPNOTSUPP;
1280 #endif
1281 }
1282 return err;
1283 }
1284 #endif
1285
1286 static int
1287 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1288 {
1289 unsigned long d;
1290 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1291 d = ct->status ^ status;
1292
1293 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1294 /* unchangeable */
1295 return -EBUSY;
1296
1297 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1298 /* SEEN_REPLY bit can only be set */
1299 return -EBUSY;
1300
1301 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1302 /* ASSURED bit can only be set */
1303 return -EBUSY;
1304
1305 /* Be careful here, modifying NAT bits can screw up things,
1306 * so don't let users modify them directly if they don't pass
1307 * nf_nat_range. */
1308 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1309 return 0;
1310 }
1311
1312 static int
1313 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1314 {
1315 #ifdef CONFIG_NF_NAT_NEEDED
1316 int ret;
1317
1318 if (cda[CTA_NAT_DST]) {
1319 ret = ctnetlink_parse_nat_setup(ct,
1320 NF_NAT_MANIP_DST,
1321 cda[CTA_NAT_DST]);
1322 if (ret < 0)
1323 return ret;
1324 }
1325 if (cda[CTA_NAT_SRC]) {
1326 ret = ctnetlink_parse_nat_setup(ct,
1327 NF_NAT_MANIP_SRC,
1328 cda[CTA_NAT_SRC]);
1329 if (ret < 0)
1330 return ret;
1331 }
1332 return 0;
1333 #else
1334 return -EOPNOTSUPP;
1335 #endif
1336 }
1337
1338 static inline int
1339 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1340 {
1341 struct nf_conntrack_helper *helper;
1342 struct nf_conn_help *help = nfct_help(ct);
1343 char *helpname = NULL;
1344 struct nlattr *helpinfo = NULL;
1345 int err;
1346
1347 /* don't change helper of sibling connections */
1348 if (ct->master)
1349 return -EBUSY;
1350
1351 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1352 if (err < 0)
1353 return err;
1354
1355 if (!strcmp(helpname, "")) {
1356 if (help && help->helper) {
1357 /* we had a helper before ... */
1358 nf_ct_remove_expectations(ct);
1359 RCU_INIT_POINTER(help->helper, NULL);
1360 }
1361
1362 return 0;
1363 }
1364
1365 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1366 nf_ct_protonum(ct));
1367 if (helper == NULL) {
1368 #ifdef CONFIG_MODULES
1369 spin_unlock_bh(&nf_conntrack_lock);
1370
1371 if (request_module("nfct-helper-%s", helpname) < 0) {
1372 spin_lock_bh(&nf_conntrack_lock);
1373 return -EOPNOTSUPP;
1374 }
1375
1376 spin_lock_bh(&nf_conntrack_lock);
1377 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1378 nf_ct_protonum(ct));
1379 if (helper)
1380 return -EAGAIN;
1381 #endif
1382 return -EOPNOTSUPP;
1383 }
1384
1385 if (help) {
1386 if (help->helper == helper) {
1387 /* update private helper data if allowed. */
1388 if (helper->from_nlattr)
1389 helper->from_nlattr(helpinfo, ct);
1390 return 0;
1391 } else
1392 return -EBUSY;
1393 }
1394
1395 /* we cannot set a helper for an existing conntrack */
1396 return -EOPNOTSUPP;
1397 }
1398
1399 static inline int
1400 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1401 {
1402 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1403
1404 if (!del_timer(&ct->timeout))
1405 return -ETIME;
1406
1407 ct->timeout.expires = jiffies + timeout * HZ;
1408 add_timer(&ct->timeout);
1409
1410 return 0;
1411 }
1412
1413 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1414 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1415 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1416 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1417 };
1418
1419 static inline int
1420 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1421 {
1422 const struct nlattr *attr = cda[CTA_PROTOINFO];
1423 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1424 struct nf_conntrack_l4proto *l4proto;
1425 int err = 0;
1426
1427 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1428 if (err < 0)
1429 return err;
1430
1431 rcu_read_lock();
1432 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1433 if (l4proto->from_nlattr)
1434 err = l4proto->from_nlattr(tb, ct);
1435 rcu_read_unlock();
1436
1437 return err;
1438 }
1439
1440 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1441 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1442 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1443 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1444 };
1445
1446 static inline int
1447 change_seq_adj(struct nf_ct_seqadj *seq, const struct nlattr * const attr)
1448 {
1449 int err;
1450 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1451
1452 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1453 if (err < 0)
1454 return err;
1455
1456 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1457 return -EINVAL;
1458
1459 seq->correction_pos =
1460 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1461
1462 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1463 return -EINVAL;
1464
1465 seq->offset_before =
1466 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1467
1468 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1469 return -EINVAL;
1470
1471 seq->offset_after =
1472 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1473
1474 return 0;
1475 }
1476
1477 static int
1478 ctnetlink_change_seq_adj(struct nf_conn *ct,
1479 const struct nlattr * const cda[])
1480 {
1481 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1482 int ret = 0;
1483
1484 if (!seqadj)
1485 return 0;
1486
1487 if (cda[CTA_SEQ_ADJ_ORIG]) {
1488 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1489 cda[CTA_SEQ_ADJ_ORIG]);
1490 if (ret < 0)
1491 return ret;
1492
1493 ct->status |= IPS_SEQ_ADJUST;
1494 }
1495
1496 if (cda[CTA_SEQ_ADJ_REPLY]) {
1497 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1498 cda[CTA_SEQ_ADJ_REPLY]);
1499 if (ret < 0)
1500 return ret;
1501
1502 ct->status |= IPS_SEQ_ADJUST;
1503 }
1504
1505 return 0;
1506 }
1507
1508 static int
1509 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1510 {
1511 #ifdef CONFIG_NF_CONNTRACK_LABELS
1512 size_t len = nla_len(cda[CTA_LABELS]);
1513 const void *mask = cda[CTA_LABELS_MASK];
1514
1515 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1516 return -EINVAL;
1517
1518 if (mask) {
1519 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1520 nla_len(cda[CTA_LABELS_MASK]) != len)
1521 return -EINVAL;
1522 mask = nla_data(cda[CTA_LABELS_MASK]);
1523 }
1524
1525 len /= sizeof(u32);
1526
1527 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1528 #else
1529 return -EOPNOTSUPP;
1530 #endif
1531 }
1532
1533 static int
1534 ctnetlink_change_conntrack(struct nf_conn *ct,
1535 const struct nlattr * const cda[])
1536 {
1537 int err;
1538
1539 /* only allow NAT changes and master assignation for new conntracks */
1540 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1541 return -EOPNOTSUPP;
1542
1543 if (cda[CTA_HELP]) {
1544 err = ctnetlink_change_helper(ct, cda);
1545 if (err < 0)
1546 return err;
1547 }
1548
1549 if (cda[CTA_TIMEOUT]) {
1550 err = ctnetlink_change_timeout(ct, cda);
1551 if (err < 0)
1552 return err;
1553 }
1554
1555 if (cda[CTA_STATUS]) {
1556 err = ctnetlink_change_status(ct, cda);
1557 if (err < 0)
1558 return err;
1559 }
1560
1561 if (cda[CTA_PROTOINFO]) {
1562 err = ctnetlink_change_protoinfo(ct, cda);
1563 if (err < 0)
1564 return err;
1565 }
1566
1567 #if defined(CONFIG_NF_CONNTRACK_MARK)
1568 if (cda[CTA_MARK])
1569 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1570 #endif
1571
1572 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1573 err = ctnetlink_change_seq_adj(ct, cda);
1574 if (err < 0)
1575 return err;
1576 }
1577
1578 if (cda[CTA_LABELS]) {
1579 err = ctnetlink_attach_labels(ct, cda);
1580 if (err < 0)
1581 return err;
1582 }
1583
1584 return 0;
1585 }
1586
1587 static struct nf_conn *
1588 ctnetlink_create_conntrack(struct net *net, u16 zone,
1589 const struct nlattr * const cda[],
1590 struct nf_conntrack_tuple *otuple,
1591 struct nf_conntrack_tuple *rtuple,
1592 u8 u3)
1593 {
1594 struct nf_conn *ct;
1595 int err = -EINVAL;
1596 struct nf_conntrack_helper *helper;
1597 struct nf_conn_tstamp *tstamp;
1598
1599 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1600 if (IS_ERR(ct))
1601 return ERR_PTR(-ENOMEM);
1602
1603 if (!cda[CTA_TIMEOUT])
1604 goto err1;
1605 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1606
1607 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1608
1609 rcu_read_lock();
1610 if (cda[CTA_HELP]) {
1611 char *helpname = NULL;
1612 struct nlattr *helpinfo = NULL;
1613
1614 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1615 if (err < 0)
1616 goto err2;
1617
1618 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1619 nf_ct_protonum(ct));
1620 if (helper == NULL) {
1621 rcu_read_unlock();
1622 #ifdef CONFIG_MODULES
1623 if (request_module("nfct-helper-%s", helpname) < 0) {
1624 err = -EOPNOTSUPP;
1625 goto err1;
1626 }
1627
1628 rcu_read_lock();
1629 helper = __nf_conntrack_helper_find(helpname,
1630 nf_ct_l3num(ct),
1631 nf_ct_protonum(ct));
1632 if (helper) {
1633 err = -EAGAIN;
1634 goto err2;
1635 }
1636 rcu_read_unlock();
1637 #endif
1638 err = -EOPNOTSUPP;
1639 goto err1;
1640 } else {
1641 struct nf_conn_help *help;
1642
1643 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1644 if (help == NULL) {
1645 err = -ENOMEM;
1646 goto err2;
1647 }
1648 /* set private helper data if allowed. */
1649 if (helper->from_nlattr)
1650 helper->from_nlattr(helpinfo, ct);
1651
1652 /* not in hash table yet so not strictly necessary */
1653 RCU_INIT_POINTER(help->helper, helper);
1654 }
1655 } else {
1656 /* try an implicit helper assignation */
1657 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1658 if (err < 0)
1659 goto err2;
1660 }
1661
1662 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1663 err = ctnetlink_change_nat(ct, cda);
1664 if (err < 0)
1665 goto err2;
1666 }
1667
1668 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1669 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1670 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1671 nf_ct_labels_ext_add(ct);
1672
1673 /* we must add conntrack extensions before confirmation. */
1674 ct->status |= IPS_CONFIRMED;
1675
1676 if (cda[CTA_STATUS]) {
1677 err = ctnetlink_change_status(ct, cda);
1678 if (err < 0)
1679 goto err2;
1680 }
1681
1682 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1683 err = ctnetlink_change_seq_adj(ct, cda);
1684 if (err < 0)
1685 goto err2;
1686 }
1687
1688 memset(&ct->proto, 0, sizeof(ct->proto));
1689 if (cda[CTA_PROTOINFO]) {
1690 err = ctnetlink_change_protoinfo(ct, cda);
1691 if (err < 0)
1692 goto err2;
1693 }
1694
1695 #if defined(CONFIG_NF_CONNTRACK_MARK)
1696 if (cda[CTA_MARK])
1697 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1698 #endif
1699
1700 /* setup master conntrack: this is a confirmed expectation */
1701 if (cda[CTA_TUPLE_MASTER]) {
1702 struct nf_conntrack_tuple master;
1703 struct nf_conntrack_tuple_hash *master_h;
1704 struct nf_conn *master_ct;
1705
1706 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1707 if (err < 0)
1708 goto err2;
1709
1710 master_h = nf_conntrack_find_get(net, zone, &master);
1711 if (master_h == NULL) {
1712 err = -ENOENT;
1713 goto err2;
1714 }
1715 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1716 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1717 ct->master = master_ct;
1718 }
1719 tstamp = nf_conn_tstamp_find(ct);
1720 if (tstamp)
1721 tstamp->start = ktime_to_ns(ktime_get_real());
1722
1723 err = nf_conntrack_hash_check_insert(ct);
1724 if (err < 0)
1725 goto err2;
1726
1727 rcu_read_unlock();
1728
1729 return ct;
1730
1731 err2:
1732 rcu_read_unlock();
1733 err1:
1734 nf_conntrack_free(ct);
1735 return ERR_PTR(err);
1736 }
1737
1738 static int
1739 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1740 const struct nlmsghdr *nlh,
1741 const struct nlattr * const cda[])
1742 {
1743 struct net *net = sock_net(ctnl);
1744 struct nf_conntrack_tuple otuple, rtuple;
1745 struct nf_conntrack_tuple_hash *h = NULL;
1746 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1747 struct nf_conn *ct;
1748 u_int8_t u3 = nfmsg->nfgen_family;
1749 u16 zone;
1750 int err;
1751
1752 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1753 if (err < 0)
1754 return err;
1755
1756 if (cda[CTA_TUPLE_ORIG]) {
1757 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1758 if (err < 0)
1759 return err;
1760 }
1761
1762 if (cda[CTA_TUPLE_REPLY]) {
1763 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1764 if (err < 0)
1765 return err;
1766 }
1767
1768 if (cda[CTA_TUPLE_ORIG])
1769 h = nf_conntrack_find_get(net, zone, &otuple);
1770 else if (cda[CTA_TUPLE_REPLY])
1771 h = nf_conntrack_find_get(net, zone, &rtuple);
1772
1773 if (h == NULL) {
1774 err = -ENOENT;
1775 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1776 enum ip_conntrack_events events;
1777
1778 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1779 return -EINVAL;
1780
1781 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1782 &rtuple, u3);
1783 if (IS_ERR(ct))
1784 return PTR_ERR(ct);
1785
1786 err = 0;
1787 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1788 events = IPCT_RELATED;
1789 else
1790 events = IPCT_NEW;
1791
1792 if (cda[CTA_LABELS] &&
1793 ctnetlink_attach_labels(ct, cda) == 0)
1794 events |= (1 << IPCT_LABEL);
1795
1796 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1797 (1 << IPCT_ASSURED) |
1798 (1 << IPCT_HELPER) |
1799 (1 << IPCT_PROTOINFO) |
1800 (1 << IPCT_SEQADJ) |
1801 (1 << IPCT_MARK) | events,
1802 ct, NETLINK_CB(skb).portid,
1803 nlmsg_report(nlh));
1804 nf_ct_put(ct);
1805 }
1806
1807 return err;
1808 }
1809 /* implicit 'else' */
1810
1811 err = -EEXIST;
1812 ct = nf_ct_tuplehash_to_ctrack(h);
1813 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1814 spin_lock_bh(&nf_conntrack_lock);
1815 err = ctnetlink_change_conntrack(ct, cda);
1816 spin_unlock_bh(&nf_conntrack_lock);
1817 if (err == 0) {
1818 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1819 (1 << IPCT_ASSURED) |
1820 (1 << IPCT_HELPER) |
1821 (1 << IPCT_LABEL) |
1822 (1 << IPCT_PROTOINFO) |
1823 (1 << IPCT_SEQADJ) |
1824 (1 << IPCT_MARK),
1825 ct, NETLINK_CB(skb).portid,
1826 nlmsg_report(nlh));
1827 }
1828 }
1829
1830 nf_ct_put(ct);
1831 return err;
1832 }
1833
1834 static int
1835 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1836 __u16 cpu, const struct ip_conntrack_stat *st)
1837 {
1838 struct nlmsghdr *nlh;
1839 struct nfgenmsg *nfmsg;
1840 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1841
1842 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1843 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1844 if (nlh == NULL)
1845 goto nlmsg_failure;
1846
1847 nfmsg = nlmsg_data(nlh);
1848 nfmsg->nfgen_family = AF_UNSPEC;
1849 nfmsg->version = NFNETLINK_V0;
1850 nfmsg->res_id = htons(cpu);
1851
1852 if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1853 nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1854 nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
1855 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1856 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1857 nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
1858 nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
1859 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1860 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1861 htonl(st->insert_failed)) ||
1862 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1863 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1864 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1865 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1866 htonl(st->search_restart)))
1867 goto nla_put_failure;
1868
1869 nlmsg_end(skb, nlh);
1870 return skb->len;
1871
1872 nla_put_failure:
1873 nlmsg_failure:
1874 nlmsg_cancel(skb, nlh);
1875 return -1;
1876 }
1877
1878 static int
1879 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
1880 {
1881 int cpu;
1882 struct net *net = sock_net(skb->sk);
1883
1884 if (cb->args[0] == nr_cpu_ids)
1885 return 0;
1886
1887 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1888 const struct ip_conntrack_stat *st;
1889
1890 if (!cpu_possible(cpu))
1891 continue;
1892
1893 st = per_cpu_ptr(net->ct.stat, cpu);
1894 if (ctnetlink_ct_stat_cpu_fill_info(skb,
1895 NETLINK_CB(cb->skb).portid,
1896 cb->nlh->nlmsg_seq,
1897 cpu, st) < 0)
1898 break;
1899 }
1900 cb->args[0] = cpu;
1901
1902 return skb->len;
1903 }
1904
1905 static int
1906 ctnetlink_stat_ct_cpu(struct sock *ctnl, struct sk_buff *skb,
1907 const struct nlmsghdr *nlh,
1908 const struct nlattr * const cda[])
1909 {
1910 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1911 struct netlink_dump_control c = {
1912 .dump = ctnetlink_ct_stat_cpu_dump,
1913 };
1914 return netlink_dump_start(ctnl, skb, nlh, &c);
1915 }
1916
1917 return 0;
1918 }
1919
1920 static int
1921 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
1922 struct net *net)
1923 {
1924 struct nlmsghdr *nlh;
1925 struct nfgenmsg *nfmsg;
1926 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1927 unsigned int nr_conntracks = atomic_read(&net->ct.count);
1928
1929 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
1930 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1931 if (nlh == NULL)
1932 goto nlmsg_failure;
1933
1934 nfmsg = nlmsg_data(nlh);
1935 nfmsg->nfgen_family = AF_UNSPEC;
1936 nfmsg->version = NFNETLINK_V0;
1937 nfmsg->res_id = 0;
1938
1939 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
1940 goto nla_put_failure;
1941
1942 nlmsg_end(skb, nlh);
1943 return skb->len;
1944
1945 nla_put_failure:
1946 nlmsg_failure:
1947 nlmsg_cancel(skb, nlh);
1948 return -1;
1949 }
1950
1951 static int
1952 ctnetlink_stat_ct(struct sock *ctnl, struct sk_buff *skb,
1953 const struct nlmsghdr *nlh,
1954 const struct nlattr * const cda[])
1955 {
1956 struct sk_buff *skb2;
1957 int err;
1958
1959 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1960 if (skb2 == NULL)
1961 return -ENOMEM;
1962
1963 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
1964 nlh->nlmsg_seq,
1965 NFNL_MSG_TYPE(nlh->nlmsg_type),
1966 sock_net(skb->sk));
1967 if (err <= 0)
1968 goto free;
1969
1970 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1971 if (err < 0)
1972 goto out;
1973
1974 return 0;
1975
1976 free:
1977 kfree_skb(skb2);
1978 out:
1979 /* this avoids a loop in nfnetlink. */
1980 return err == -EAGAIN ? -ENOBUFS : err;
1981 }
1982
1983 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1984 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1985 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1986 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1987 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1988 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1989 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
1990 .len = NF_CT_HELPER_NAME_LEN - 1 },
1991 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
1992 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
1993 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
1994 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
1995 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
1996 };
1997
1998 static struct nf_conntrack_expect *
1999 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2000 struct nf_conntrack_helper *helper,
2001 struct nf_conntrack_tuple *tuple,
2002 struct nf_conntrack_tuple *mask);
2003
2004 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
2005 static size_t
2006 ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
2007 {
2008 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2009 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2010 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2011 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2012 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2013 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2014 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2015 + nla_total_size(0) /* CTA_PROTOINFO */
2016 + nla_total_size(0) /* CTA_HELP */
2017 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2018 + ctnetlink_secctx_size(ct)
2019 #ifdef CONFIG_NF_NAT_NEEDED
2020 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2021 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2022 #endif
2023 #ifdef CONFIG_NF_CONNTRACK_MARK
2024 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2025 #endif
2026 + ctnetlink_proto_size(ct)
2027 ;
2028 }
2029
2030 static int
2031 ctnetlink_nfqueue_build(struct sk_buff *skb, struct nf_conn *ct)
2032 {
2033 struct nlattr *nest_parms;
2034
2035 rcu_read_lock();
2036 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2037 if (!nest_parms)
2038 goto nla_put_failure;
2039 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2040 goto nla_put_failure;
2041 nla_nest_end(skb, nest_parms);
2042
2043 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2044 if (!nest_parms)
2045 goto nla_put_failure;
2046 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2047 goto nla_put_failure;
2048 nla_nest_end(skb, nest_parms);
2049
2050 if (nf_ct_zone(ct)) {
2051 if (nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
2052 goto nla_put_failure;
2053 }
2054
2055 if (ctnetlink_dump_id(skb, ct) < 0)
2056 goto nla_put_failure;
2057
2058 if (ctnetlink_dump_status(skb, ct) < 0)
2059 goto nla_put_failure;
2060
2061 if (ctnetlink_dump_timeout(skb, ct) < 0)
2062 goto nla_put_failure;
2063
2064 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2065 goto nla_put_failure;
2066
2067 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2068 goto nla_put_failure;
2069
2070 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2071 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2072 goto nla_put_failure;
2073 #endif
2074 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2075 goto nla_put_failure;
2076
2077 if ((ct->status & IPS_SEQ_ADJUST) &&
2078 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2079 goto nla_put_failure;
2080
2081 #ifdef CONFIG_NF_CONNTRACK_MARK
2082 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2083 goto nla_put_failure;
2084 #endif
2085 if (ctnetlink_dump_labels(skb, ct) < 0)
2086 goto nla_put_failure;
2087 rcu_read_unlock();
2088 return 0;
2089
2090 nla_put_failure:
2091 rcu_read_unlock();
2092 return -ENOSPC;
2093 }
2094
2095 static int
2096 ctnetlink_nfqueue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2097 {
2098 int err;
2099
2100 if (cda[CTA_TIMEOUT]) {
2101 err = ctnetlink_change_timeout(ct, cda);
2102 if (err < 0)
2103 return err;
2104 }
2105 if (cda[CTA_STATUS]) {
2106 err = ctnetlink_change_status(ct, cda);
2107 if (err < 0)
2108 return err;
2109 }
2110 if (cda[CTA_HELP]) {
2111 err = ctnetlink_change_helper(ct, cda);
2112 if (err < 0)
2113 return err;
2114 }
2115 if (cda[CTA_LABELS]) {
2116 err = ctnetlink_attach_labels(ct, cda);
2117 if (err < 0)
2118 return err;
2119 }
2120 #if defined(CONFIG_NF_CONNTRACK_MARK)
2121 if (cda[CTA_MARK])
2122 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2123 #endif
2124 return 0;
2125 }
2126
2127 static int
2128 ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
2129 {
2130 struct nlattr *cda[CTA_MAX+1];
2131 int ret;
2132
2133 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2134 if (ret < 0)
2135 return ret;
2136
2137 spin_lock_bh(&nf_conntrack_lock);
2138 ret = ctnetlink_nfqueue_parse_ct((const struct nlattr **)cda, ct);
2139 spin_unlock_bh(&nf_conntrack_lock);
2140
2141 return ret;
2142 }
2143
2144 static int ctnetlink_nfqueue_exp_parse(const struct nlattr * const *cda,
2145 const struct nf_conn *ct,
2146 struct nf_conntrack_tuple *tuple,
2147 struct nf_conntrack_tuple *mask)
2148 {
2149 int err;
2150
2151 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2152 nf_ct_l3num(ct));
2153 if (err < 0)
2154 return err;
2155
2156 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2157 nf_ct_l3num(ct));
2158 }
2159
2160 static int
2161 ctnetlink_nfqueue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2162 u32 portid, u32 report)
2163 {
2164 struct nlattr *cda[CTA_EXPECT_MAX+1];
2165 struct nf_conntrack_tuple tuple, mask;
2166 struct nf_conntrack_helper *helper = NULL;
2167 struct nf_conntrack_expect *exp;
2168 int err;
2169
2170 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2171 if (err < 0)
2172 return err;
2173
2174 err = ctnetlink_nfqueue_exp_parse((const struct nlattr * const *)cda,
2175 ct, &tuple, &mask);
2176 if (err < 0)
2177 return err;
2178
2179 if (cda[CTA_EXPECT_HELP_NAME]) {
2180 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2181
2182 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2183 nf_ct_protonum(ct));
2184 if (helper == NULL)
2185 return -EOPNOTSUPP;
2186 }
2187
2188 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2189 helper, &tuple, &mask);
2190 if (IS_ERR(exp))
2191 return PTR_ERR(exp);
2192
2193 err = nf_ct_expect_related_report(exp, portid, report);
2194 if (err < 0) {
2195 nf_ct_expect_put(exp);
2196 return err;
2197 }
2198
2199 return 0;
2200 }
2201
2202 static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
2203 .build_size = ctnetlink_nfqueue_build_size,
2204 .build = ctnetlink_nfqueue_build,
2205 .parse = ctnetlink_nfqueue_parse,
2206 .attach_expect = ctnetlink_nfqueue_attach_expect,
2207 .seq_adjust = nf_ct_tcp_seqadj_set,
2208 };
2209 #endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
2210
2211 /***********************************************************************
2212 * EXPECT
2213 ***********************************************************************/
2214
2215 static inline int
2216 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2217 const struct nf_conntrack_tuple *tuple,
2218 enum ctattr_expect type)
2219 {
2220 struct nlattr *nest_parms;
2221
2222 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2223 if (!nest_parms)
2224 goto nla_put_failure;
2225 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2226 goto nla_put_failure;
2227 nla_nest_end(skb, nest_parms);
2228
2229 return 0;
2230
2231 nla_put_failure:
2232 return -1;
2233 }
2234
2235 static inline int
2236 ctnetlink_exp_dump_mask(struct sk_buff *skb,
2237 const struct nf_conntrack_tuple *tuple,
2238 const struct nf_conntrack_tuple_mask *mask)
2239 {
2240 int ret;
2241 struct nf_conntrack_l3proto *l3proto;
2242 struct nf_conntrack_l4proto *l4proto;
2243 struct nf_conntrack_tuple m;
2244 struct nlattr *nest_parms;
2245
2246 memset(&m, 0xFF, sizeof(m));
2247 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2248 m.src.u.all = mask->src.u.all;
2249 m.dst.protonum = tuple->dst.protonum;
2250
2251 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2252 if (!nest_parms)
2253 goto nla_put_failure;
2254
2255 rcu_read_lock();
2256 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2257 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2258 if (ret >= 0) {
2259 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2260 tuple->dst.protonum);
2261 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2262 }
2263 rcu_read_unlock();
2264
2265 if (unlikely(ret < 0))
2266 goto nla_put_failure;
2267
2268 nla_nest_end(skb, nest_parms);
2269
2270 return 0;
2271
2272 nla_put_failure:
2273 return -1;
2274 }
2275
2276 static const union nf_inet_addr any_addr;
2277
2278 static int
2279 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2280 const struct nf_conntrack_expect *exp)
2281 {
2282 struct nf_conn *master = exp->master;
2283 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2284 struct nf_conn_help *help;
2285 #ifdef CONFIG_NF_NAT_NEEDED
2286 struct nlattr *nest_parms;
2287 struct nf_conntrack_tuple nat_tuple = {};
2288 #endif
2289 struct nf_ct_helper_expectfn *expfn;
2290
2291 if (timeout < 0)
2292 timeout = 0;
2293
2294 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2295 goto nla_put_failure;
2296 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2297 goto nla_put_failure;
2298 if (ctnetlink_exp_dump_tuple(skb,
2299 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2300 CTA_EXPECT_MASTER) < 0)
2301 goto nla_put_failure;
2302
2303 #ifdef CONFIG_NF_NAT_NEEDED
2304 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2305 exp->saved_proto.all) {
2306 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2307 if (!nest_parms)
2308 goto nla_put_failure;
2309
2310 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2311 goto nla_put_failure;
2312
2313 nat_tuple.src.l3num = nf_ct_l3num(master);
2314 nat_tuple.src.u3 = exp->saved_addr;
2315 nat_tuple.dst.protonum = nf_ct_protonum(master);
2316 nat_tuple.src.u = exp->saved_proto;
2317
2318 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2319 CTA_EXPECT_NAT_TUPLE) < 0)
2320 goto nla_put_failure;
2321 nla_nest_end(skb, nest_parms);
2322 }
2323 #endif
2324 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2325 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2326 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2327 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2328 goto nla_put_failure;
2329 help = nfct_help(master);
2330 if (help) {
2331 struct nf_conntrack_helper *helper;
2332
2333 helper = rcu_dereference(help->helper);
2334 if (helper &&
2335 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2336 goto nla_put_failure;
2337 }
2338 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2339 if (expfn != NULL &&
2340 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2341 goto nla_put_failure;
2342
2343 return 0;
2344
2345 nla_put_failure:
2346 return -1;
2347 }
2348
2349 static int
2350 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2351 int event, const struct nf_conntrack_expect *exp)
2352 {
2353 struct nlmsghdr *nlh;
2354 struct nfgenmsg *nfmsg;
2355 unsigned int flags = portid ? NLM_F_MULTI : 0;
2356
2357 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2358 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2359 if (nlh == NULL)
2360 goto nlmsg_failure;
2361
2362 nfmsg = nlmsg_data(nlh);
2363 nfmsg->nfgen_family = exp->tuple.src.l3num;
2364 nfmsg->version = NFNETLINK_V0;
2365 nfmsg->res_id = 0;
2366
2367 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2368 goto nla_put_failure;
2369
2370 nlmsg_end(skb, nlh);
2371 return skb->len;
2372
2373 nlmsg_failure:
2374 nla_put_failure:
2375 nlmsg_cancel(skb, nlh);
2376 return -1;
2377 }
2378
2379 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2380 static int
2381 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2382 {
2383 struct nf_conntrack_expect *exp = item->exp;
2384 struct net *net = nf_ct_exp_net(exp);
2385 struct nlmsghdr *nlh;
2386 struct nfgenmsg *nfmsg;
2387 struct sk_buff *skb;
2388 unsigned int type, group;
2389 int flags = 0;
2390
2391 if (events & (1 << IPEXP_DESTROY)) {
2392 type = IPCTNL_MSG_EXP_DELETE;
2393 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2394 } else if (events & (1 << IPEXP_NEW)) {
2395 type = IPCTNL_MSG_EXP_NEW;
2396 flags = NLM_F_CREATE|NLM_F_EXCL;
2397 group = NFNLGRP_CONNTRACK_EXP_NEW;
2398 } else
2399 return 0;
2400
2401 if (!item->report && !nfnetlink_has_listeners(net, group))
2402 return 0;
2403
2404 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2405 if (skb == NULL)
2406 goto errout;
2407
2408 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2409 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2410 if (nlh == NULL)
2411 goto nlmsg_failure;
2412
2413 nfmsg = nlmsg_data(nlh);
2414 nfmsg->nfgen_family = exp->tuple.src.l3num;
2415 nfmsg->version = NFNETLINK_V0;
2416 nfmsg->res_id = 0;
2417
2418 rcu_read_lock();
2419 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2420 goto nla_put_failure;
2421 rcu_read_unlock();
2422
2423 nlmsg_end(skb, nlh);
2424 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2425 return 0;
2426
2427 nla_put_failure:
2428 rcu_read_unlock();
2429 nlmsg_cancel(skb, nlh);
2430 nlmsg_failure:
2431 kfree_skb(skb);
2432 errout:
2433 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2434 return 0;
2435 }
2436 #endif
2437 static int ctnetlink_exp_done(struct netlink_callback *cb)
2438 {
2439 if (cb->args[1])
2440 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2441 return 0;
2442 }
2443
2444 static int
2445 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2446 {
2447 struct net *net = sock_net(skb->sk);
2448 struct nf_conntrack_expect *exp, *last;
2449 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2450 u_int8_t l3proto = nfmsg->nfgen_family;
2451
2452 rcu_read_lock();
2453 last = (struct nf_conntrack_expect *)cb->args[1];
2454 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2455 restart:
2456 hlist_for_each_entry(exp, &net->ct.expect_hash[cb->args[0]],
2457 hnode) {
2458 if (l3proto && exp->tuple.src.l3num != l3proto)
2459 continue;
2460 if (cb->args[1]) {
2461 if (exp != last)
2462 continue;
2463 cb->args[1] = 0;
2464 }
2465 if (ctnetlink_exp_fill_info(skb,
2466 NETLINK_CB(cb->skb).portid,
2467 cb->nlh->nlmsg_seq,
2468 IPCTNL_MSG_EXP_NEW,
2469 exp) < 0) {
2470 if (!atomic_inc_not_zero(&exp->use))
2471 continue;
2472 cb->args[1] = (unsigned long)exp;
2473 goto out;
2474 }
2475 }
2476 if (cb->args[1]) {
2477 cb->args[1] = 0;
2478 goto restart;
2479 }
2480 }
2481 out:
2482 rcu_read_unlock();
2483 if (last)
2484 nf_ct_expect_put(last);
2485
2486 return skb->len;
2487 }
2488
2489 static int
2490 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2491 {
2492 struct nf_conntrack_expect *exp, *last;
2493 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2494 struct nf_conn *ct = cb->data;
2495 struct nf_conn_help *help = nfct_help(ct);
2496 u_int8_t l3proto = nfmsg->nfgen_family;
2497
2498 if (cb->args[0])
2499 return 0;
2500
2501 rcu_read_lock();
2502 last = (struct nf_conntrack_expect *)cb->args[1];
2503 restart:
2504 hlist_for_each_entry(exp, &help->expectations, lnode) {
2505 if (l3proto && exp->tuple.src.l3num != l3proto)
2506 continue;
2507 if (cb->args[1]) {
2508 if (exp != last)
2509 continue;
2510 cb->args[1] = 0;
2511 }
2512 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2513 cb->nlh->nlmsg_seq,
2514 IPCTNL_MSG_EXP_NEW,
2515 exp) < 0) {
2516 if (!atomic_inc_not_zero(&exp->use))
2517 continue;
2518 cb->args[1] = (unsigned long)exp;
2519 goto out;
2520 }
2521 }
2522 if (cb->args[1]) {
2523 cb->args[1] = 0;
2524 goto restart;
2525 }
2526 cb->args[0] = 1;
2527 out:
2528 rcu_read_unlock();
2529 if (last)
2530 nf_ct_expect_put(last);
2531
2532 return skb->len;
2533 }
2534
2535 static int ctnetlink_dump_exp_ct(struct sock *ctnl, struct sk_buff *skb,
2536 const struct nlmsghdr *nlh,
2537 const struct nlattr * const cda[])
2538 {
2539 int err;
2540 struct net *net = sock_net(ctnl);
2541 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2542 u_int8_t u3 = nfmsg->nfgen_family;
2543 struct nf_conntrack_tuple tuple;
2544 struct nf_conntrack_tuple_hash *h;
2545 struct nf_conn *ct;
2546 u16 zone = 0;
2547 struct netlink_dump_control c = {
2548 .dump = ctnetlink_exp_ct_dump_table,
2549 .done = ctnetlink_exp_done,
2550 };
2551
2552 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2553 if (err < 0)
2554 return err;
2555
2556 if (cda[CTA_EXPECT_ZONE]) {
2557 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2558 if (err < 0)
2559 return err;
2560 }
2561
2562 h = nf_conntrack_find_get(net, zone, &tuple);
2563 if (!h)
2564 return -ENOENT;
2565
2566 ct = nf_ct_tuplehash_to_ctrack(h);
2567 c.data = ct;
2568
2569 err = netlink_dump_start(ctnl, skb, nlh, &c);
2570 nf_ct_put(ct);
2571
2572 return err;
2573 }
2574
2575 static int
2576 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
2577 const struct nlmsghdr *nlh,
2578 const struct nlattr * const cda[])
2579 {
2580 struct net *net = sock_net(ctnl);
2581 struct nf_conntrack_tuple tuple;
2582 struct nf_conntrack_expect *exp;
2583 struct sk_buff *skb2;
2584 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2585 u_int8_t u3 = nfmsg->nfgen_family;
2586 u16 zone;
2587 int err;
2588
2589 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2590 if (cda[CTA_EXPECT_MASTER])
2591 return ctnetlink_dump_exp_ct(ctnl, skb, nlh, cda);
2592 else {
2593 struct netlink_dump_control c = {
2594 .dump = ctnetlink_exp_dump_table,
2595 .done = ctnetlink_exp_done,
2596 };
2597 return netlink_dump_start(ctnl, skb, nlh, &c);
2598 }
2599 }
2600
2601 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2602 if (err < 0)
2603 return err;
2604
2605 if (cda[CTA_EXPECT_TUPLE])
2606 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2607 else if (cda[CTA_EXPECT_MASTER])
2608 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2609 else
2610 return -EINVAL;
2611
2612 if (err < 0)
2613 return err;
2614
2615 exp = nf_ct_expect_find_get(net, zone, &tuple);
2616 if (!exp)
2617 return -ENOENT;
2618
2619 if (cda[CTA_EXPECT_ID]) {
2620 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2621 if (ntohl(id) != (u32)(unsigned long)exp) {
2622 nf_ct_expect_put(exp);
2623 return -ENOENT;
2624 }
2625 }
2626
2627 err = -ENOMEM;
2628 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2629 if (skb2 == NULL) {
2630 nf_ct_expect_put(exp);
2631 goto out;
2632 }
2633
2634 rcu_read_lock();
2635 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2636 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2637 rcu_read_unlock();
2638 nf_ct_expect_put(exp);
2639 if (err <= 0)
2640 goto free;
2641
2642 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2643 if (err < 0)
2644 goto out;
2645
2646 return 0;
2647
2648 free:
2649 kfree_skb(skb2);
2650 out:
2651 /* this avoids a loop in nfnetlink. */
2652 return err == -EAGAIN ? -ENOBUFS : err;
2653 }
2654
2655 static int
2656 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
2657 const struct nlmsghdr *nlh,
2658 const struct nlattr * const cda[])
2659 {
2660 struct net *net = sock_net(ctnl);
2661 struct nf_conntrack_expect *exp;
2662 struct nf_conntrack_tuple tuple;
2663 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2664 struct hlist_node *next;
2665 u_int8_t u3 = nfmsg->nfgen_family;
2666 unsigned int i;
2667 u16 zone;
2668 int err;
2669
2670 if (cda[CTA_EXPECT_TUPLE]) {
2671 /* delete a single expect by tuple */
2672 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2673 if (err < 0)
2674 return err;
2675
2676 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2677 if (err < 0)
2678 return err;
2679
2680 /* bump usage count to 2 */
2681 exp = nf_ct_expect_find_get(net, zone, &tuple);
2682 if (!exp)
2683 return -ENOENT;
2684
2685 if (cda[CTA_EXPECT_ID]) {
2686 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2687 if (ntohl(id) != (u32)(unsigned long)exp) {
2688 nf_ct_expect_put(exp);
2689 return -ENOENT;
2690 }
2691 }
2692
2693 /* after list removal, usage count == 1 */
2694 spin_lock_bh(&nf_conntrack_lock);
2695 if (del_timer(&exp->timeout)) {
2696 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2697 nlmsg_report(nlh));
2698 nf_ct_expect_put(exp);
2699 }
2700 spin_unlock_bh(&nf_conntrack_lock);
2701 /* have to put what we 'get' above.
2702 * after this line usage count == 0 */
2703 nf_ct_expect_put(exp);
2704 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2705 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2706 struct nf_conn_help *m_help;
2707
2708 /* delete all expectations for this helper */
2709 spin_lock_bh(&nf_conntrack_lock);
2710 for (i = 0; i < nf_ct_expect_hsize; i++) {
2711 hlist_for_each_entry_safe(exp, next,
2712 &net->ct.expect_hash[i],
2713 hnode) {
2714 m_help = nfct_help(exp->master);
2715 if (!strcmp(m_help->helper->name, name) &&
2716 del_timer(&exp->timeout)) {
2717 nf_ct_unlink_expect_report(exp,
2718 NETLINK_CB(skb).portid,
2719 nlmsg_report(nlh));
2720 nf_ct_expect_put(exp);
2721 }
2722 }
2723 }
2724 spin_unlock_bh(&nf_conntrack_lock);
2725 } else {
2726 /* This basically means we have to flush everything*/
2727 spin_lock_bh(&nf_conntrack_lock);
2728 for (i = 0; i < nf_ct_expect_hsize; i++) {
2729 hlist_for_each_entry_safe(exp, next,
2730 &net->ct.expect_hash[i],
2731 hnode) {
2732 if (del_timer(&exp->timeout)) {
2733 nf_ct_unlink_expect_report(exp,
2734 NETLINK_CB(skb).portid,
2735 nlmsg_report(nlh));
2736 nf_ct_expect_put(exp);
2737 }
2738 }
2739 }
2740 spin_unlock_bh(&nf_conntrack_lock);
2741 }
2742
2743 return 0;
2744 }
2745 static int
2746 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2747 const struct nlattr * const cda[])
2748 {
2749 if (cda[CTA_EXPECT_TIMEOUT]) {
2750 if (!del_timer(&x->timeout))
2751 return -ETIME;
2752
2753 x->timeout.expires = jiffies +
2754 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2755 add_timer(&x->timeout);
2756 }
2757 return 0;
2758 }
2759
2760 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2761 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2762 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2763 };
2764
2765 static int
2766 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2767 struct nf_conntrack_expect *exp,
2768 u_int8_t u3)
2769 {
2770 #ifdef CONFIG_NF_NAT_NEEDED
2771 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2772 struct nf_conntrack_tuple nat_tuple = {};
2773 int err;
2774
2775 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2776 if (err < 0)
2777 return err;
2778
2779 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2780 return -EINVAL;
2781
2782 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2783 &nat_tuple, CTA_EXPECT_NAT_TUPLE, u3);
2784 if (err < 0)
2785 return err;
2786
2787 exp->saved_addr = nat_tuple.src.u3;
2788 exp->saved_proto = nat_tuple.src.u;
2789 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2790
2791 return 0;
2792 #else
2793 return -EOPNOTSUPP;
2794 #endif
2795 }
2796
2797 static struct nf_conntrack_expect *
2798 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
2799 struct nf_conntrack_helper *helper,
2800 struct nf_conntrack_tuple *tuple,
2801 struct nf_conntrack_tuple *mask)
2802 {
2803 u_int32_t class = 0;
2804 struct nf_conntrack_expect *exp;
2805 struct nf_conn_help *help;
2806 int err;
2807
2808 if (cda[CTA_EXPECT_CLASS] && helper) {
2809 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
2810 if (class > helper->expect_class_max)
2811 return ERR_PTR(-EINVAL);
2812 }
2813 exp = nf_ct_expect_alloc(ct);
2814 if (!exp)
2815 return ERR_PTR(-ENOMEM);
2816
2817 help = nfct_help(ct);
2818 if (!help) {
2819 if (!cda[CTA_EXPECT_TIMEOUT]) {
2820 err = -EINVAL;
2821 goto err_out;
2822 }
2823 exp->timeout.expires =
2824 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2825
2826 exp->flags = NF_CT_EXPECT_USERSPACE;
2827 if (cda[CTA_EXPECT_FLAGS]) {
2828 exp->flags |=
2829 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2830 }
2831 } else {
2832 if (cda[CTA_EXPECT_FLAGS]) {
2833 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2834 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2835 } else
2836 exp->flags = 0;
2837 }
2838 if (cda[CTA_EXPECT_FN]) {
2839 const char *name = nla_data(cda[CTA_EXPECT_FN]);
2840 struct nf_ct_helper_expectfn *expfn;
2841
2842 expfn = nf_ct_helper_expectfn_find_by_name(name);
2843 if (expfn == NULL) {
2844 err = -EINVAL;
2845 goto err_out;
2846 }
2847 exp->expectfn = expfn->expectfn;
2848 } else
2849 exp->expectfn = NULL;
2850
2851 exp->class = class;
2852 exp->master = ct;
2853 exp->helper = helper;
2854 exp->tuple = *tuple;
2855 exp->mask.src.u3 = mask->src.u3;
2856 exp->mask.src.u.all = mask->src.u.all;
2857
2858 if (cda[CTA_EXPECT_NAT]) {
2859 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
2860 exp, nf_ct_l3num(ct));
2861 if (err < 0)
2862 goto err_out;
2863 }
2864 return exp;
2865 err_out:
2866 nf_ct_expect_put(exp);
2867 return ERR_PTR(err);
2868 }
2869
2870 static int
2871 ctnetlink_create_expect(struct net *net, u16 zone,
2872 const struct nlattr * const cda[],
2873 u_int8_t u3, u32 portid, int report)
2874 {
2875 struct nf_conntrack_tuple tuple, mask, master_tuple;
2876 struct nf_conntrack_tuple_hash *h = NULL;
2877 struct nf_conntrack_helper *helper = NULL;
2878 struct nf_conntrack_expect *exp;
2879 struct nf_conn *ct;
2880 int err;
2881
2882 /* caller guarantees that those three CTA_EXPECT_* exist */
2883 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2884 if (err < 0)
2885 return err;
2886 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2887 if (err < 0)
2888 return err;
2889 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2890 if (err < 0)
2891 return err;
2892
2893 /* Look for master conntrack of this expectation */
2894 h = nf_conntrack_find_get(net, zone, &master_tuple);
2895 if (!h)
2896 return -ENOENT;
2897 ct = nf_ct_tuplehash_to_ctrack(h);
2898
2899 if (cda[CTA_EXPECT_HELP_NAME]) {
2900 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2901
2902 helper = __nf_conntrack_helper_find(helpname, u3,
2903 nf_ct_protonum(ct));
2904 if (helper == NULL) {
2905 #ifdef CONFIG_MODULES
2906 if (request_module("nfct-helper-%s", helpname) < 0) {
2907 err = -EOPNOTSUPP;
2908 goto err_ct;
2909 }
2910 helper = __nf_conntrack_helper_find(helpname, u3,
2911 nf_ct_protonum(ct));
2912 if (helper) {
2913 err = -EAGAIN;
2914 goto err_ct;
2915 }
2916 #endif
2917 err = -EOPNOTSUPP;
2918 goto err_ct;
2919 }
2920 }
2921
2922 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
2923 if (IS_ERR(exp)) {
2924 err = PTR_ERR(exp);
2925 goto err_ct;
2926 }
2927
2928 err = nf_ct_expect_related_report(exp, portid, report);
2929 if (err < 0)
2930 goto err_exp;
2931
2932 return 0;
2933 err_exp:
2934 nf_ct_expect_put(exp);
2935 err_ct:
2936 nf_ct_put(ct);
2937 return err;
2938 }
2939
2940 static int
2941 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2942 const struct nlmsghdr *nlh,
2943 const struct nlattr * const cda[])
2944 {
2945 struct net *net = sock_net(ctnl);
2946 struct nf_conntrack_tuple tuple;
2947 struct nf_conntrack_expect *exp;
2948 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2949 u_int8_t u3 = nfmsg->nfgen_family;
2950 u16 zone;
2951 int err;
2952
2953 if (!cda[CTA_EXPECT_TUPLE]
2954 || !cda[CTA_EXPECT_MASK]
2955 || !cda[CTA_EXPECT_MASTER])
2956 return -EINVAL;
2957
2958 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2959 if (err < 0)
2960 return err;
2961
2962 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2963 if (err < 0)
2964 return err;
2965
2966 spin_lock_bh(&nf_conntrack_lock);
2967 exp = __nf_ct_expect_find(net, zone, &tuple);
2968
2969 if (!exp) {
2970 spin_unlock_bh(&nf_conntrack_lock);
2971 err = -ENOENT;
2972 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2973 err = ctnetlink_create_expect(net, zone, cda,
2974 u3,
2975 NETLINK_CB(skb).portid,
2976 nlmsg_report(nlh));
2977 }
2978 return err;
2979 }
2980
2981 err = -EEXIST;
2982 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2983 err = ctnetlink_change_expect(exp, cda);
2984 spin_unlock_bh(&nf_conntrack_lock);
2985
2986 return err;
2987 }
2988
2989 static int
2990 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
2991 const struct ip_conntrack_stat *st)
2992 {
2993 struct nlmsghdr *nlh;
2994 struct nfgenmsg *nfmsg;
2995 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2996
2997 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
2998 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2999 if (nlh == NULL)
3000 goto nlmsg_failure;
3001
3002 nfmsg = nlmsg_data(nlh);
3003 nfmsg->nfgen_family = AF_UNSPEC;
3004 nfmsg->version = NFNETLINK_V0;
3005 nfmsg->res_id = htons(cpu);
3006
3007 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3008 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3009 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3010 goto nla_put_failure;
3011
3012 nlmsg_end(skb, nlh);
3013 return skb->len;
3014
3015 nla_put_failure:
3016 nlmsg_failure:
3017 nlmsg_cancel(skb, nlh);
3018 return -1;
3019 }
3020
3021 static int
3022 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3023 {
3024 int cpu;
3025 struct net *net = sock_net(skb->sk);
3026
3027 if (cb->args[0] == nr_cpu_ids)
3028 return 0;
3029
3030 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3031 const struct ip_conntrack_stat *st;
3032
3033 if (!cpu_possible(cpu))
3034 continue;
3035
3036 st = per_cpu_ptr(net->ct.stat, cpu);
3037 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3038 cb->nlh->nlmsg_seq,
3039 cpu, st) < 0)
3040 break;
3041 }
3042 cb->args[0] = cpu;
3043
3044 return skb->len;
3045 }
3046
3047 static int
3048 ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
3049 const struct nlmsghdr *nlh,
3050 const struct nlattr * const cda[])
3051 {
3052 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3053 struct netlink_dump_control c = {
3054 .dump = ctnetlink_exp_stat_cpu_dump,
3055 };
3056 return netlink_dump_start(ctnl, skb, nlh, &c);
3057 }
3058
3059 return 0;
3060 }
3061
3062 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3063 static struct nf_ct_event_notifier ctnl_notifier = {
3064 .fcn = ctnetlink_conntrack_event,
3065 };
3066
3067 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3068 .fcn = ctnetlink_expect_event,
3069 };
3070 #endif
3071
3072 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3073 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3074 .attr_count = CTA_MAX,
3075 .policy = ct_nla_policy },
3076 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3077 .attr_count = CTA_MAX,
3078 .policy = ct_nla_policy },
3079 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3080 .attr_count = CTA_MAX,
3081 .policy = ct_nla_policy },
3082 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3083 .attr_count = CTA_MAX,
3084 .policy = ct_nla_policy },
3085 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3086 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3087 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3088 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3089 };
3090
3091 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3092 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3093 .attr_count = CTA_EXPECT_MAX,
3094 .policy = exp_nla_policy },
3095 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3096 .attr_count = CTA_EXPECT_MAX,
3097 .policy = exp_nla_policy },
3098 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3099 .attr_count = CTA_EXPECT_MAX,
3100 .policy = exp_nla_policy },
3101 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3102 };
3103
3104 static const struct nfnetlink_subsystem ctnl_subsys = {
3105 .name = "conntrack",
3106 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3107 .cb_count = IPCTNL_MSG_MAX,
3108 .cb = ctnl_cb,
3109 };
3110
3111 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3112 .name = "conntrack_expect",
3113 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3114 .cb_count = IPCTNL_MSG_EXP_MAX,
3115 .cb = ctnl_exp_cb,
3116 };
3117
3118 MODULE_ALIAS("ip_conntrack_netlink");
3119 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3120 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3121
3122 static int __net_init ctnetlink_net_init(struct net *net)
3123 {
3124 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3125 int ret;
3126
3127 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3128 if (ret < 0) {
3129 pr_err("ctnetlink_init: cannot register notifier.\n");
3130 goto err_out;
3131 }
3132
3133 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3134 if (ret < 0) {
3135 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3136 goto err_unreg_notifier;
3137 }
3138 #endif
3139 return 0;
3140
3141 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3142 err_unreg_notifier:
3143 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3144 err_out:
3145 return ret;
3146 #endif
3147 }
3148
3149 static void ctnetlink_net_exit(struct net *net)
3150 {
3151 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3152 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3153 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3154 #endif
3155 }
3156
3157 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3158 {
3159 struct net *net;
3160
3161 list_for_each_entry(net, net_exit_list, exit_list)
3162 ctnetlink_net_exit(net);
3163 }
3164
3165 static struct pernet_operations ctnetlink_net_ops = {
3166 .init = ctnetlink_net_init,
3167 .exit_batch = ctnetlink_net_exit_batch,
3168 };
3169
3170 static int __init ctnetlink_init(void)
3171 {
3172 int ret;
3173
3174 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3175 ret = nfnetlink_subsys_register(&ctnl_subsys);
3176 if (ret < 0) {
3177 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3178 goto err_out;
3179 }
3180
3181 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3182 if (ret < 0) {
3183 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3184 goto err_unreg_subsys;
3185 }
3186
3187 ret = register_pernet_subsys(&ctnetlink_net_ops);
3188 if (ret < 0) {
3189 pr_err("ctnetlink_init: cannot register pernet operations\n");
3190 goto err_unreg_exp_subsys;
3191 }
3192 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3193 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3194 RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
3195 #endif
3196 return 0;
3197
3198 err_unreg_exp_subsys:
3199 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3200 err_unreg_subsys:
3201 nfnetlink_subsys_unregister(&ctnl_subsys);
3202 err_out:
3203 return ret;
3204 }
3205
3206 static void __exit ctnetlink_exit(void)
3207 {
3208 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3209
3210 unregister_pernet_subsys(&ctnetlink_net_ops);
3211 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3212 nfnetlink_subsys_unregister(&ctnl_subsys);
3213 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3214 RCU_INIT_POINTER(nfq_ct_hook, NULL);
3215 #endif
3216 }
3217
3218 module_init(ctnetlink_init);
3219 module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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