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Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 #ifdef CONFIG_NF_CONNTRACK_ZONES
601 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE */
602 #endif
603 + ctnetlink_proto_size(ct)
604 + ctnetlink_label_size(ct)
605 ;
606 }
607
608 #ifdef CONFIG_NF_CONNTRACK_EVENTS
609 static int
610 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
611 {
612 struct net *net;
613 struct nlmsghdr *nlh;
614 struct nfgenmsg *nfmsg;
615 struct nlattr *nest_parms;
616 struct nf_conn *ct = item->ct;
617 struct sk_buff *skb;
618 unsigned int type;
619 unsigned int flags = 0, group;
620 int err;
621
622 /* ignore our fake conntrack entry */
623 if (nf_ct_is_untracked(ct))
624 return 0;
625
626 if (events & (1 << IPCT_DESTROY)) {
627 type = IPCTNL_MSG_CT_DELETE;
628 group = NFNLGRP_CONNTRACK_DESTROY;
629 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
630 type = IPCTNL_MSG_CT_NEW;
631 flags = NLM_F_CREATE|NLM_F_EXCL;
632 group = NFNLGRP_CONNTRACK_NEW;
633 } else if (events) {
634 type = IPCTNL_MSG_CT_NEW;
635 group = NFNLGRP_CONNTRACK_UPDATE;
636 } else
637 return 0;
638
639 net = nf_ct_net(ct);
640 if (!item->report && !nfnetlink_has_listeners(net, group))
641 return 0;
642
643 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
644 if (skb == NULL)
645 goto errout;
646
647 type |= NFNL_SUBSYS_CTNETLINK << 8;
648 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
649 if (nlh == NULL)
650 goto nlmsg_failure;
651
652 nfmsg = nlmsg_data(nlh);
653 nfmsg->nfgen_family = nf_ct_l3num(ct);
654 nfmsg->version = NFNETLINK_V0;
655 nfmsg->res_id = 0;
656
657 rcu_read_lock();
658 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
659 if (!nest_parms)
660 goto nla_put_failure;
661 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
662 goto nla_put_failure;
663 nla_nest_end(skb, nest_parms);
664
665 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
666 if (!nest_parms)
667 goto nla_put_failure;
668 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
669 goto nla_put_failure;
670 nla_nest_end(skb, nest_parms);
671
672 if (nf_ct_zone(ct) &&
673 nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
674 goto nla_put_failure;
675
676 if (ctnetlink_dump_id(skb, ct) < 0)
677 goto nla_put_failure;
678
679 if (ctnetlink_dump_status(skb, ct) < 0)
680 goto nla_put_failure;
681
682 if (events & (1 << IPCT_DESTROY)) {
683 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
684 ctnetlink_dump_timestamp(skb, ct) < 0)
685 goto nla_put_failure;
686 } else {
687 if (ctnetlink_dump_timeout(skb, ct) < 0)
688 goto nla_put_failure;
689
690 if (events & (1 << IPCT_PROTOINFO)
691 && ctnetlink_dump_protoinfo(skb, ct) < 0)
692 goto nla_put_failure;
693
694 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
695 && ctnetlink_dump_helpinfo(skb, ct) < 0)
696 goto nla_put_failure;
697
698 #ifdef CONFIG_NF_CONNTRACK_SECMARK
699 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
700 && ctnetlink_dump_secctx(skb, ct) < 0)
701 goto nla_put_failure;
702 #endif
703 if (events & (1 << IPCT_LABEL) &&
704 ctnetlink_dump_labels(skb, ct) < 0)
705 goto nla_put_failure;
706
707 if (events & (1 << IPCT_RELATED) &&
708 ctnetlink_dump_master(skb, ct) < 0)
709 goto nla_put_failure;
710
711 if (events & (1 << IPCT_SEQADJ) &&
712 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
713 goto nla_put_failure;
714 }
715
716 #ifdef CONFIG_NF_CONNTRACK_MARK
717 if ((events & (1 << IPCT_MARK) || ct->mark)
718 && ctnetlink_dump_mark(skb, ct) < 0)
719 goto nla_put_failure;
720 #endif
721 rcu_read_unlock();
722
723 nlmsg_end(skb, nlh);
724 err = nfnetlink_send(skb, net, item->portid, group, item->report,
725 GFP_ATOMIC);
726 if (err == -ENOBUFS || err == -EAGAIN)
727 return -ENOBUFS;
728
729 return 0;
730
731 nla_put_failure:
732 rcu_read_unlock();
733 nlmsg_cancel(skb, nlh);
734 nlmsg_failure:
735 kfree_skb(skb);
736 errout:
737 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
738 return -ENOBUFS;
739
740 return 0;
741 }
742 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
743
744 static int ctnetlink_done(struct netlink_callback *cb)
745 {
746 if (cb->args[1])
747 nf_ct_put((struct nf_conn *)cb->args[1]);
748 if (cb->data)
749 kfree(cb->data);
750 return 0;
751 }
752
753 struct ctnetlink_dump_filter {
754 struct {
755 u_int32_t val;
756 u_int32_t mask;
757 } mark;
758 };
759
760 static int
761 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
762 {
763 struct net *net = sock_net(skb->sk);
764 struct nf_conn *ct, *last;
765 struct nf_conntrack_tuple_hash *h;
766 struct hlist_nulls_node *n;
767 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
768 u_int8_t l3proto = nfmsg->nfgen_family;
769 int res;
770 spinlock_t *lockp;
771
772 #ifdef CONFIG_NF_CONNTRACK_MARK
773 const struct ctnetlink_dump_filter *filter = cb->data;
774 #endif
775
776 last = (struct nf_conn *)cb->args[1];
777
778 local_bh_disable();
779 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
780 restart:
781 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
782 spin_lock(lockp);
783 if (cb->args[0] >= net->ct.htable_size) {
784 spin_unlock(lockp);
785 goto out;
786 }
787 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
788 hnnode) {
789 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
790 continue;
791 ct = nf_ct_tuplehash_to_ctrack(h);
792 /* Dump entries of a given L3 protocol number.
793 * If it is not specified, ie. l3proto == 0,
794 * then dump everything. */
795 if (l3proto && nf_ct_l3num(ct) != l3proto)
796 continue;
797 if (cb->args[1]) {
798 if (ct != last)
799 continue;
800 cb->args[1] = 0;
801 }
802 #ifdef CONFIG_NF_CONNTRACK_MARK
803 if (filter && !((ct->mark & filter->mark.mask) ==
804 filter->mark.val)) {
805 continue;
806 }
807 #endif
808 rcu_read_lock();
809 res =
810 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
811 cb->nlh->nlmsg_seq,
812 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
813 ct);
814 rcu_read_unlock();
815 if (res < 0) {
816 nf_conntrack_get(&ct->ct_general);
817 cb->args[1] = (unsigned long)ct;
818 spin_unlock(lockp);
819 goto out;
820 }
821 }
822 spin_unlock(lockp);
823 if (cb->args[1]) {
824 cb->args[1] = 0;
825 goto restart;
826 }
827 }
828 out:
829 local_bh_enable();
830 if (last)
831 nf_ct_put(last);
832
833 return skb->len;
834 }
835
836 static inline int
837 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
838 {
839 struct nlattr *tb[CTA_IP_MAX+1];
840 struct nf_conntrack_l3proto *l3proto;
841 int ret = 0;
842
843 ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
844 if (ret < 0)
845 return ret;
846
847 rcu_read_lock();
848 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
849
850 if (likely(l3proto->nlattr_to_tuple)) {
851 ret = nla_validate_nested(attr, CTA_IP_MAX,
852 l3proto->nla_policy);
853 if (ret == 0)
854 ret = l3proto->nlattr_to_tuple(tb, tuple);
855 }
856
857 rcu_read_unlock();
858
859 return ret;
860 }
861
862 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
863 [CTA_PROTO_NUM] = { .type = NLA_U8 },
864 };
865
866 static inline int
867 ctnetlink_parse_tuple_proto(struct nlattr *attr,
868 struct nf_conntrack_tuple *tuple)
869 {
870 struct nlattr *tb[CTA_PROTO_MAX+1];
871 struct nf_conntrack_l4proto *l4proto;
872 int ret = 0;
873
874 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
875 if (ret < 0)
876 return ret;
877
878 if (!tb[CTA_PROTO_NUM])
879 return -EINVAL;
880 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
881
882 rcu_read_lock();
883 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
884
885 if (likely(l4proto->nlattr_to_tuple)) {
886 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
887 l4proto->nla_policy);
888 if (ret == 0)
889 ret = l4proto->nlattr_to_tuple(tb, tuple);
890 }
891
892 rcu_read_unlock();
893
894 return ret;
895 }
896
897 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
898 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
899 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
900 };
901
902 static int
903 ctnetlink_parse_tuple(const struct nlattr * const cda[],
904 struct nf_conntrack_tuple *tuple,
905 enum ctattr_type type, u_int8_t l3num)
906 {
907 struct nlattr *tb[CTA_TUPLE_MAX+1];
908 int err;
909
910 memset(tuple, 0, sizeof(*tuple));
911
912 err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
913 if (err < 0)
914 return err;
915
916 if (!tb[CTA_TUPLE_IP])
917 return -EINVAL;
918
919 tuple->src.l3num = l3num;
920
921 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
922 if (err < 0)
923 return err;
924
925 if (!tb[CTA_TUPLE_PROTO])
926 return -EINVAL;
927
928 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
929 if (err < 0)
930 return err;
931
932 /* orig and expect tuples get DIR_ORIGINAL */
933 if (type == CTA_TUPLE_REPLY)
934 tuple->dst.dir = IP_CT_DIR_REPLY;
935 else
936 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
937
938 return 0;
939 }
940
941 static int
942 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
943 {
944 if (attr)
945 #ifdef CONFIG_NF_CONNTRACK_ZONES
946 *zone = ntohs(nla_get_be16(attr));
947 #else
948 return -EOPNOTSUPP;
949 #endif
950 else
951 *zone = 0;
952
953 return 0;
954 }
955
956 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
957 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
958 .len = NF_CT_HELPER_NAME_LEN - 1 },
959 };
960
961 static inline int
962 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
963 struct nlattr **helpinfo)
964 {
965 int err;
966 struct nlattr *tb[CTA_HELP_MAX+1];
967
968 err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
969 if (err < 0)
970 return err;
971
972 if (!tb[CTA_HELP_NAME])
973 return -EINVAL;
974
975 *helper_name = nla_data(tb[CTA_HELP_NAME]);
976
977 if (tb[CTA_HELP_INFO])
978 *helpinfo = tb[CTA_HELP_INFO];
979
980 return 0;
981 }
982
983 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
984 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
985 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
986 [CTA_STATUS] = { .type = NLA_U32 },
987 [CTA_PROTOINFO] = { .type = NLA_NESTED },
988 [CTA_HELP] = { .type = NLA_NESTED },
989 [CTA_NAT_SRC] = { .type = NLA_NESTED },
990 [CTA_TIMEOUT] = { .type = NLA_U32 },
991 [CTA_MARK] = { .type = NLA_U32 },
992 [CTA_ID] = { .type = NLA_U32 },
993 [CTA_NAT_DST] = { .type = NLA_NESTED },
994 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
995 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
996 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
997 [CTA_ZONE] = { .type = NLA_U16 },
998 [CTA_MARK_MASK] = { .type = NLA_U32 },
999 [CTA_LABELS] = { .type = NLA_BINARY,
1000 .len = NF_CT_LABELS_MAX_SIZE },
1001 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1002 .len = NF_CT_LABELS_MAX_SIZE },
1003 };
1004
1005 static int
1006 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
1007 const struct nlmsghdr *nlh,
1008 const struct nlattr * const cda[])
1009 {
1010 struct net *net = sock_net(ctnl);
1011 struct nf_conntrack_tuple_hash *h;
1012 struct nf_conntrack_tuple tuple;
1013 struct nf_conn *ct;
1014 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1015 u_int8_t u3 = nfmsg->nfgen_family;
1016 u16 zone;
1017 int err;
1018
1019 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1020 if (err < 0)
1021 return err;
1022
1023 if (cda[CTA_TUPLE_ORIG])
1024 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1025 else if (cda[CTA_TUPLE_REPLY])
1026 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1027 else {
1028 /* Flush the whole table */
1029 nf_conntrack_flush_report(net,
1030 NETLINK_CB(skb).portid,
1031 nlmsg_report(nlh));
1032 return 0;
1033 }
1034
1035 if (err < 0)
1036 return err;
1037
1038 h = nf_conntrack_find_get(net, zone, &tuple);
1039 if (!h)
1040 return -ENOENT;
1041
1042 ct = nf_ct_tuplehash_to_ctrack(h);
1043
1044 if (cda[CTA_ID]) {
1045 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1046 if (id != (u32)(unsigned long)ct) {
1047 nf_ct_put(ct);
1048 return -ENOENT;
1049 }
1050 }
1051
1052 if (del_timer(&ct->timeout))
1053 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1054
1055 nf_ct_put(ct);
1056
1057 return 0;
1058 }
1059
1060 static int
1061 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
1062 const struct nlmsghdr *nlh,
1063 const struct nlattr * const cda[])
1064 {
1065 struct net *net = sock_net(ctnl);
1066 struct nf_conntrack_tuple_hash *h;
1067 struct nf_conntrack_tuple tuple;
1068 struct nf_conn *ct;
1069 struct sk_buff *skb2 = NULL;
1070 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1071 u_int8_t u3 = nfmsg->nfgen_family;
1072 u16 zone;
1073 int err;
1074
1075 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1076 struct netlink_dump_control c = {
1077 .dump = ctnetlink_dump_table,
1078 .done = ctnetlink_done,
1079 };
1080 #ifdef CONFIG_NF_CONNTRACK_MARK
1081 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1082 struct ctnetlink_dump_filter *filter;
1083
1084 filter = kzalloc(sizeof(struct ctnetlink_dump_filter),
1085 GFP_ATOMIC);
1086 if (filter == NULL)
1087 return -ENOMEM;
1088
1089 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
1090 filter->mark.mask =
1091 ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1092 c.data = filter;
1093 }
1094 #endif
1095 return netlink_dump_start(ctnl, skb, nlh, &c);
1096 }
1097
1098 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1099 if (err < 0)
1100 return err;
1101
1102 if (cda[CTA_TUPLE_ORIG])
1103 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1104 else if (cda[CTA_TUPLE_REPLY])
1105 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1106 else
1107 return -EINVAL;
1108
1109 if (err < 0)
1110 return err;
1111
1112 h = nf_conntrack_find_get(net, zone, &tuple);
1113 if (!h)
1114 return -ENOENT;
1115
1116 ct = nf_ct_tuplehash_to_ctrack(h);
1117
1118 err = -ENOMEM;
1119 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1120 if (skb2 == NULL) {
1121 nf_ct_put(ct);
1122 return -ENOMEM;
1123 }
1124
1125 rcu_read_lock();
1126 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1127 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1128 rcu_read_unlock();
1129 nf_ct_put(ct);
1130 if (err <= 0)
1131 goto free;
1132
1133 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1134 if (err < 0)
1135 goto out;
1136
1137 return 0;
1138
1139 free:
1140 kfree_skb(skb2);
1141 out:
1142 /* this avoids a loop in nfnetlink. */
1143 return err == -EAGAIN ? -ENOBUFS : err;
1144 }
1145
1146 static int ctnetlink_done_list(struct netlink_callback *cb)
1147 {
1148 if (cb->args[1])
1149 nf_ct_put((struct nf_conn *)cb->args[1]);
1150 return 0;
1151 }
1152
1153 static int
1154 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1155 {
1156 struct nf_conn *ct, *last;
1157 struct nf_conntrack_tuple_hash *h;
1158 struct hlist_nulls_node *n;
1159 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1160 u_int8_t l3proto = nfmsg->nfgen_family;
1161 int res;
1162 int cpu;
1163 struct hlist_nulls_head *list;
1164 struct net *net = sock_net(skb->sk);
1165
1166 if (cb->args[2])
1167 return 0;
1168
1169 last = (struct nf_conn *)cb->args[1];
1170
1171 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1172 struct ct_pcpu *pcpu;
1173
1174 if (!cpu_possible(cpu))
1175 continue;
1176
1177 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1178 spin_lock_bh(&pcpu->lock);
1179 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1180 restart:
1181 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1182 ct = nf_ct_tuplehash_to_ctrack(h);
1183 if (l3proto && nf_ct_l3num(ct) != l3proto)
1184 continue;
1185 if (cb->args[1]) {
1186 if (ct != last)
1187 continue;
1188 cb->args[1] = 0;
1189 }
1190 rcu_read_lock();
1191 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1192 cb->nlh->nlmsg_seq,
1193 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1194 ct);
1195 rcu_read_unlock();
1196 if (res < 0) {
1197 if (!atomic_inc_not_zero(&ct->ct_general.use))
1198 continue;
1199 cb->args[0] = cpu;
1200 cb->args[1] = (unsigned long)ct;
1201 spin_unlock_bh(&pcpu->lock);
1202 goto out;
1203 }
1204 }
1205 if (cb->args[1]) {
1206 cb->args[1] = 0;
1207 goto restart;
1208 }
1209 spin_unlock_bh(&pcpu->lock);
1210 }
1211 cb->args[2] = 1;
1212 out:
1213 if (last)
1214 nf_ct_put(last);
1215
1216 return skb->len;
1217 }
1218
1219 static int
1220 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1221 {
1222 return ctnetlink_dump_list(skb, cb, true);
1223 }
1224
1225 static int
1226 ctnetlink_get_ct_dying(struct sock *ctnl, struct sk_buff *skb,
1227 const struct nlmsghdr *nlh,
1228 const struct nlattr * const cda[])
1229 {
1230 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1231 struct netlink_dump_control c = {
1232 .dump = ctnetlink_dump_dying,
1233 .done = ctnetlink_done_list,
1234 };
1235 return netlink_dump_start(ctnl, skb, nlh, &c);
1236 }
1237
1238 return -EOPNOTSUPP;
1239 }
1240
1241 static int
1242 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1243 {
1244 return ctnetlink_dump_list(skb, cb, false);
1245 }
1246
1247 static int
1248 ctnetlink_get_ct_unconfirmed(struct sock *ctnl, struct sk_buff *skb,
1249 const struct nlmsghdr *nlh,
1250 const struct nlattr * const cda[])
1251 {
1252 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1253 struct netlink_dump_control c = {
1254 .dump = ctnetlink_dump_unconfirmed,
1255 .done = ctnetlink_done_list,
1256 };
1257 return netlink_dump_start(ctnl, skb, nlh, &c);
1258 }
1259
1260 return -EOPNOTSUPP;
1261 }
1262
1263 #ifdef CONFIG_NF_NAT_NEEDED
1264 static int
1265 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1266 enum nf_nat_manip_type manip,
1267 const struct nlattr *attr)
1268 {
1269 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1270 int err;
1271
1272 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1273 if (!parse_nat_setup) {
1274 #ifdef CONFIG_MODULES
1275 rcu_read_unlock();
1276 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1277 if (request_module("nf-nat") < 0) {
1278 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1279 rcu_read_lock();
1280 return -EOPNOTSUPP;
1281 }
1282 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1283 rcu_read_lock();
1284 if (nfnetlink_parse_nat_setup_hook)
1285 return -EAGAIN;
1286 #endif
1287 return -EOPNOTSUPP;
1288 }
1289
1290 err = parse_nat_setup(ct, manip, attr);
1291 if (err == -EAGAIN) {
1292 #ifdef CONFIG_MODULES
1293 rcu_read_unlock();
1294 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1295 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1296 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1297 rcu_read_lock();
1298 return -EOPNOTSUPP;
1299 }
1300 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1301 rcu_read_lock();
1302 #else
1303 err = -EOPNOTSUPP;
1304 #endif
1305 }
1306 return err;
1307 }
1308 #endif
1309
1310 static int
1311 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1312 {
1313 unsigned long d;
1314 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1315 d = ct->status ^ status;
1316
1317 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1318 /* unchangeable */
1319 return -EBUSY;
1320
1321 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1322 /* SEEN_REPLY bit can only be set */
1323 return -EBUSY;
1324
1325 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1326 /* ASSURED bit can only be set */
1327 return -EBUSY;
1328
1329 /* Be careful here, modifying NAT bits can screw up things,
1330 * so don't let users modify them directly if they don't pass
1331 * nf_nat_range. */
1332 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1333 return 0;
1334 }
1335
1336 static int
1337 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1338 {
1339 #ifdef CONFIG_NF_NAT_NEEDED
1340 int ret;
1341
1342 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1343 return 0;
1344
1345 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1346 cda[CTA_NAT_DST]);
1347 if (ret < 0)
1348 return ret;
1349
1350 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1351 cda[CTA_NAT_SRC]);
1352 return ret;
1353 #else
1354 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1355 return 0;
1356 return -EOPNOTSUPP;
1357 #endif
1358 }
1359
1360 static inline int
1361 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1362 {
1363 struct nf_conntrack_helper *helper;
1364 struct nf_conn_help *help = nfct_help(ct);
1365 char *helpname = NULL;
1366 struct nlattr *helpinfo = NULL;
1367 int err;
1368
1369 /* don't change helper of sibling connections */
1370 if (ct->master)
1371 return -EBUSY;
1372
1373 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1374 if (err < 0)
1375 return err;
1376
1377 if (!strcmp(helpname, "")) {
1378 if (help && help->helper) {
1379 /* we had a helper before ... */
1380 nf_ct_remove_expectations(ct);
1381 RCU_INIT_POINTER(help->helper, NULL);
1382 }
1383
1384 return 0;
1385 }
1386
1387 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1388 nf_ct_protonum(ct));
1389 if (helper == NULL) {
1390 #ifdef CONFIG_MODULES
1391 spin_unlock_bh(&nf_conntrack_expect_lock);
1392
1393 if (request_module("nfct-helper-%s", helpname) < 0) {
1394 spin_lock_bh(&nf_conntrack_expect_lock);
1395 return -EOPNOTSUPP;
1396 }
1397
1398 spin_lock_bh(&nf_conntrack_expect_lock);
1399 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1400 nf_ct_protonum(ct));
1401 if (helper)
1402 return -EAGAIN;
1403 #endif
1404 return -EOPNOTSUPP;
1405 }
1406
1407 if (help) {
1408 if (help->helper == helper) {
1409 /* update private helper data if allowed. */
1410 if (helper->from_nlattr)
1411 helper->from_nlattr(helpinfo, ct);
1412 return 0;
1413 } else
1414 return -EBUSY;
1415 }
1416
1417 /* we cannot set a helper for an existing conntrack */
1418 return -EOPNOTSUPP;
1419 }
1420
1421 static inline int
1422 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1423 {
1424 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1425
1426 if (!del_timer(&ct->timeout))
1427 return -ETIME;
1428
1429 ct->timeout.expires = jiffies + timeout * HZ;
1430 add_timer(&ct->timeout);
1431
1432 return 0;
1433 }
1434
1435 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1436 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1437 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1438 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1439 };
1440
1441 static inline int
1442 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1443 {
1444 const struct nlattr *attr = cda[CTA_PROTOINFO];
1445 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1446 struct nf_conntrack_l4proto *l4proto;
1447 int err = 0;
1448
1449 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1450 if (err < 0)
1451 return err;
1452
1453 rcu_read_lock();
1454 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1455 if (l4proto->from_nlattr)
1456 err = l4proto->from_nlattr(tb, ct);
1457 rcu_read_unlock();
1458
1459 return err;
1460 }
1461
1462 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1463 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1464 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1465 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1466 };
1467
1468 static inline int
1469 change_seq_adj(struct nf_ct_seqadj *seq, const struct nlattr * const attr)
1470 {
1471 int err;
1472 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1473
1474 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1475 if (err < 0)
1476 return err;
1477
1478 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1479 return -EINVAL;
1480
1481 seq->correction_pos =
1482 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1483
1484 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1485 return -EINVAL;
1486
1487 seq->offset_before =
1488 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1489
1490 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1491 return -EINVAL;
1492
1493 seq->offset_after =
1494 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1495
1496 return 0;
1497 }
1498
1499 static int
1500 ctnetlink_change_seq_adj(struct nf_conn *ct,
1501 const struct nlattr * const cda[])
1502 {
1503 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1504 int ret = 0;
1505
1506 if (!seqadj)
1507 return 0;
1508
1509 if (cda[CTA_SEQ_ADJ_ORIG]) {
1510 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1511 cda[CTA_SEQ_ADJ_ORIG]);
1512 if (ret < 0)
1513 return ret;
1514
1515 ct->status |= IPS_SEQ_ADJUST;
1516 }
1517
1518 if (cda[CTA_SEQ_ADJ_REPLY]) {
1519 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1520 cda[CTA_SEQ_ADJ_REPLY]);
1521 if (ret < 0)
1522 return ret;
1523
1524 ct->status |= IPS_SEQ_ADJUST;
1525 }
1526
1527 return 0;
1528 }
1529
1530 static int
1531 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1532 {
1533 #ifdef CONFIG_NF_CONNTRACK_LABELS
1534 size_t len = nla_len(cda[CTA_LABELS]);
1535 const void *mask = cda[CTA_LABELS_MASK];
1536
1537 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1538 return -EINVAL;
1539
1540 if (mask) {
1541 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1542 nla_len(cda[CTA_LABELS_MASK]) != len)
1543 return -EINVAL;
1544 mask = nla_data(cda[CTA_LABELS_MASK]);
1545 }
1546
1547 len /= sizeof(u32);
1548
1549 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1550 #else
1551 return -EOPNOTSUPP;
1552 #endif
1553 }
1554
1555 static int
1556 ctnetlink_change_conntrack(struct nf_conn *ct,
1557 const struct nlattr * const cda[])
1558 {
1559 int err;
1560
1561 /* only allow NAT changes and master assignation for new conntracks */
1562 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1563 return -EOPNOTSUPP;
1564
1565 if (cda[CTA_HELP]) {
1566 err = ctnetlink_change_helper(ct, cda);
1567 if (err < 0)
1568 return err;
1569 }
1570
1571 if (cda[CTA_TIMEOUT]) {
1572 err = ctnetlink_change_timeout(ct, cda);
1573 if (err < 0)
1574 return err;
1575 }
1576
1577 if (cda[CTA_STATUS]) {
1578 err = ctnetlink_change_status(ct, cda);
1579 if (err < 0)
1580 return err;
1581 }
1582
1583 if (cda[CTA_PROTOINFO]) {
1584 err = ctnetlink_change_protoinfo(ct, cda);
1585 if (err < 0)
1586 return err;
1587 }
1588
1589 #if defined(CONFIG_NF_CONNTRACK_MARK)
1590 if (cda[CTA_MARK])
1591 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1592 #endif
1593
1594 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1595 err = ctnetlink_change_seq_adj(ct, cda);
1596 if (err < 0)
1597 return err;
1598 }
1599
1600 if (cda[CTA_LABELS]) {
1601 err = ctnetlink_attach_labels(ct, cda);
1602 if (err < 0)
1603 return err;
1604 }
1605
1606 return 0;
1607 }
1608
1609 static struct nf_conn *
1610 ctnetlink_create_conntrack(struct net *net, u16 zone,
1611 const struct nlattr * const cda[],
1612 struct nf_conntrack_tuple *otuple,
1613 struct nf_conntrack_tuple *rtuple,
1614 u8 u3)
1615 {
1616 struct nf_conn *ct;
1617 int err = -EINVAL;
1618 struct nf_conntrack_helper *helper;
1619 struct nf_conn_tstamp *tstamp;
1620
1621 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1622 if (IS_ERR(ct))
1623 return ERR_PTR(-ENOMEM);
1624
1625 if (!cda[CTA_TIMEOUT])
1626 goto err1;
1627 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1628
1629 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1630
1631 rcu_read_lock();
1632 if (cda[CTA_HELP]) {
1633 char *helpname = NULL;
1634 struct nlattr *helpinfo = NULL;
1635
1636 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1637 if (err < 0)
1638 goto err2;
1639
1640 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1641 nf_ct_protonum(ct));
1642 if (helper == NULL) {
1643 rcu_read_unlock();
1644 #ifdef CONFIG_MODULES
1645 if (request_module("nfct-helper-%s", helpname) < 0) {
1646 err = -EOPNOTSUPP;
1647 goto err1;
1648 }
1649
1650 rcu_read_lock();
1651 helper = __nf_conntrack_helper_find(helpname,
1652 nf_ct_l3num(ct),
1653 nf_ct_protonum(ct));
1654 if (helper) {
1655 err = -EAGAIN;
1656 goto err2;
1657 }
1658 rcu_read_unlock();
1659 #endif
1660 err = -EOPNOTSUPP;
1661 goto err1;
1662 } else {
1663 struct nf_conn_help *help;
1664
1665 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1666 if (help == NULL) {
1667 err = -ENOMEM;
1668 goto err2;
1669 }
1670 /* set private helper data if allowed. */
1671 if (helper->from_nlattr)
1672 helper->from_nlattr(helpinfo, ct);
1673
1674 /* not in hash table yet so not strictly necessary */
1675 RCU_INIT_POINTER(help->helper, helper);
1676 }
1677 } else {
1678 /* try an implicit helper assignation */
1679 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1680 if (err < 0)
1681 goto err2;
1682 }
1683
1684 err = ctnetlink_setup_nat(ct, cda);
1685 if (err < 0)
1686 goto err2;
1687
1688 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1689 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1690 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1691 nf_ct_labels_ext_add(ct);
1692
1693 /* we must add conntrack extensions before confirmation. */
1694 ct->status |= IPS_CONFIRMED;
1695
1696 if (cda[CTA_STATUS]) {
1697 err = ctnetlink_change_status(ct, cda);
1698 if (err < 0)
1699 goto err2;
1700 }
1701
1702 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1703 err = ctnetlink_change_seq_adj(ct, cda);
1704 if (err < 0)
1705 goto err2;
1706 }
1707
1708 memset(&ct->proto, 0, sizeof(ct->proto));
1709 if (cda[CTA_PROTOINFO]) {
1710 err = ctnetlink_change_protoinfo(ct, cda);
1711 if (err < 0)
1712 goto err2;
1713 }
1714
1715 #if defined(CONFIG_NF_CONNTRACK_MARK)
1716 if (cda[CTA_MARK])
1717 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1718 #endif
1719
1720 /* setup master conntrack: this is a confirmed expectation */
1721 if (cda[CTA_TUPLE_MASTER]) {
1722 struct nf_conntrack_tuple master;
1723 struct nf_conntrack_tuple_hash *master_h;
1724 struct nf_conn *master_ct;
1725
1726 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1727 if (err < 0)
1728 goto err2;
1729
1730 master_h = nf_conntrack_find_get(net, zone, &master);
1731 if (master_h == NULL) {
1732 err = -ENOENT;
1733 goto err2;
1734 }
1735 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1736 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1737 ct->master = master_ct;
1738 }
1739 tstamp = nf_conn_tstamp_find(ct);
1740 if (tstamp)
1741 tstamp->start = ktime_to_ns(ktime_get_real());
1742
1743 err = nf_conntrack_hash_check_insert(ct);
1744 if (err < 0)
1745 goto err2;
1746
1747 rcu_read_unlock();
1748
1749 return ct;
1750
1751 err2:
1752 rcu_read_unlock();
1753 err1:
1754 nf_conntrack_free(ct);
1755 return ERR_PTR(err);
1756 }
1757
1758 static int
1759 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1760 const struct nlmsghdr *nlh,
1761 const struct nlattr * const cda[])
1762 {
1763 struct net *net = sock_net(ctnl);
1764 struct nf_conntrack_tuple otuple, rtuple;
1765 struct nf_conntrack_tuple_hash *h = NULL;
1766 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1767 struct nf_conn *ct;
1768 u_int8_t u3 = nfmsg->nfgen_family;
1769 u16 zone;
1770 int err;
1771
1772 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1773 if (err < 0)
1774 return err;
1775
1776 if (cda[CTA_TUPLE_ORIG]) {
1777 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1778 if (err < 0)
1779 return err;
1780 }
1781
1782 if (cda[CTA_TUPLE_REPLY]) {
1783 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1784 if (err < 0)
1785 return err;
1786 }
1787
1788 if (cda[CTA_TUPLE_ORIG])
1789 h = nf_conntrack_find_get(net, zone, &otuple);
1790 else if (cda[CTA_TUPLE_REPLY])
1791 h = nf_conntrack_find_get(net, zone, &rtuple);
1792
1793 if (h == NULL) {
1794 err = -ENOENT;
1795 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1796 enum ip_conntrack_events events;
1797
1798 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1799 return -EINVAL;
1800
1801 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1802 &rtuple, u3);
1803 if (IS_ERR(ct))
1804 return PTR_ERR(ct);
1805
1806 err = 0;
1807 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1808 events = IPCT_RELATED;
1809 else
1810 events = IPCT_NEW;
1811
1812 if (cda[CTA_LABELS] &&
1813 ctnetlink_attach_labels(ct, cda) == 0)
1814 events |= (1 << IPCT_LABEL);
1815
1816 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1817 (1 << IPCT_ASSURED) |
1818 (1 << IPCT_HELPER) |
1819 (1 << IPCT_PROTOINFO) |
1820 (1 << IPCT_SEQADJ) |
1821 (1 << IPCT_MARK) | events,
1822 ct, NETLINK_CB(skb).portid,
1823 nlmsg_report(nlh));
1824 nf_ct_put(ct);
1825 }
1826
1827 return err;
1828 }
1829 /* implicit 'else' */
1830
1831 err = -EEXIST;
1832 ct = nf_ct_tuplehash_to_ctrack(h);
1833 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1834 spin_lock_bh(&nf_conntrack_expect_lock);
1835 err = ctnetlink_change_conntrack(ct, cda);
1836 spin_unlock_bh(&nf_conntrack_expect_lock);
1837 if (err == 0) {
1838 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1839 (1 << IPCT_ASSURED) |
1840 (1 << IPCT_HELPER) |
1841 (1 << IPCT_LABEL) |
1842 (1 << IPCT_PROTOINFO) |
1843 (1 << IPCT_SEQADJ) |
1844 (1 << IPCT_MARK),
1845 ct, NETLINK_CB(skb).portid,
1846 nlmsg_report(nlh));
1847 }
1848 }
1849
1850 nf_ct_put(ct);
1851 return err;
1852 }
1853
1854 static int
1855 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1856 __u16 cpu, const struct ip_conntrack_stat *st)
1857 {
1858 struct nlmsghdr *nlh;
1859 struct nfgenmsg *nfmsg;
1860 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1861
1862 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1863 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1864 if (nlh == NULL)
1865 goto nlmsg_failure;
1866
1867 nfmsg = nlmsg_data(nlh);
1868 nfmsg->nfgen_family = AF_UNSPEC;
1869 nfmsg->version = NFNETLINK_V0;
1870 nfmsg->res_id = htons(cpu);
1871
1872 if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1873 nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1874 nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
1875 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1876 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1877 nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
1878 nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
1879 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1880 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1881 htonl(st->insert_failed)) ||
1882 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1883 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1884 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1885 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1886 htonl(st->search_restart)))
1887 goto nla_put_failure;
1888
1889 nlmsg_end(skb, nlh);
1890 return skb->len;
1891
1892 nla_put_failure:
1893 nlmsg_failure:
1894 nlmsg_cancel(skb, nlh);
1895 return -1;
1896 }
1897
1898 static int
1899 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
1900 {
1901 int cpu;
1902 struct net *net = sock_net(skb->sk);
1903
1904 if (cb->args[0] == nr_cpu_ids)
1905 return 0;
1906
1907 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1908 const struct ip_conntrack_stat *st;
1909
1910 if (!cpu_possible(cpu))
1911 continue;
1912
1913 st = per_cpu_ptr(net->ct.stat, cpu);
1914 if (ctnetlink_ct_stat_cpu_fill_info(skb,
1915 NETLINK_CB(cb->skb).portid,
1916 cb->nlh->nlmsg_seq,
1917 cpu, st) < 0)
1918 break;
1919 }
1920 cb->args[0] = cpu;
1921
1922 return skb->len;
1923 }
1924
1925 static int
1926 ctnetlink_stat_ct_cpu(struct sock *ctnl, struct sk_buff *skb,
1927 const struct nlmsghdr *nlh,
1928 const struct nlattr * const cda[])
1929 {
1930 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1931 struct netlink_dump_control c = {
1932 .dump = ctnetlink_ct_stat_cpu_dump,
1933 };
1934 return netlink_dump_start(ctnl, skb, nlh, &c);
1935 }
1936
1937 return 0;
1938 }
1939
1940 static int
1941 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
1942 struct net *net)
1943 {
1944 struct nlmsghdr *nlh;
1945 struct nfgenmsg *nfmsg;
1946 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1947 unsigned int nr_conntracks = atomic_read(&net->ct.count);
1948
1949 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
1950 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1951 if (nlh == NULL)
1952 goto nlmsg_failure;
1953
1954 nfmsg = nlmsg_data(nlh);
1955 nfmsg->nfgen_family = AF_UNSPEC;
1956 nfmsg->version = NFNETLINK_V0;
1957 nfmsg->res_id = 0;
1958
1959 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
1960 goto nla_put_failure;
1961
1962 nlmsg_end(skb, nlh);
1963 return skb->len;
1964
1965 nla_put_failure:
1966 nlmsg_failure:
1967 nlmsg_cancel(skb, nlh);
1968 return -1;
1969 }
1970
1971 static int
1972 ctnetlink_stat_ct(struct sock *ctnl, struct sk_buff *skb,
1973 const struct nlmsghdr *nlh,
1974 const struct nlattr * const cda[])
1975 {
1976 struct sk_buff *skb2;
1977 int err;
1978
1979 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1980 if (skb2 == NULL)
1981 return -ENOMEM;
1982
1983 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
1984 nlh->nlmsg_seq,
1985 NFNL_MSG_TYPE(nlh->nlmsg_type),
1986 sock_net(skb->sk));
1987 if (err <= 0)
1988 goto free;
1989
1990 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1991 if (err < 0)
1992 goto out;
1993
1994 return 0;
1995
1996 free:
1997 kfree_skb(skb2);
1998 out:
1999 /* this avoids a loop in nfnetlink. */
2000 return err == -EAGAIN ? -ENOBUFS : err;
2001 }
2002
2003 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2004 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2005 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2006 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2007 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2008 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2009 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2010 .len = NF_CT_HELPER_NAME_LEN - 1 },
2011 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2012 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2013 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2014 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2015 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2016 };
2017
2018 static struct nf_conntrack_expect *
2019 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2020 struct nf_conntrack_helper *helper,
2021 struct nf_conntrack_tuple *tuple,
2022 struct nf_conntrack_tuple *mask);
2023
2024 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
2025 static size_t
2026 ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
2027 {
2028 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2029 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2030 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2031 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2032 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2033 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2034 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2035 + nla_total_size(0) /* CTA_PROTOINFO */
2036 + nla_total_size(0) /* CTA_HELP */
2037 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2038 + ctnetlink_secctx_size(ct)
2039 #ifdef CONFIG_NF_NAT_NEEDED
2040 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2041 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2042 #endif
2043 #ifdef CONFIG_NF_CONNTRACK_MARK
2044 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2045 #endif
2046 #ifdef CONFIG_NF_CONNTRACK_ZONES
2047 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE */
2048 #endif
2049 + ctnetlink_proto_size(ct)
2050 ;
2051 }
2052
2053 static int
2054 ctnetlink_nfqueue_build(struct sk_buff *skb, struct nf_conn *ct)
2055 {
2056 struct nlattr *nest_parms;
2057
2058 rcu_read_lock();
2059 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2060 if (!nest_parms)
2061 goto nla_put_failure;
2062 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2063 goto nla_put_failure;
2064 nla_nest_end(skb, nest_parms);
2065
2066 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2067 if (!nest_parms)
2068 goto nla_put_failure;
2069 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2070 goto nla_put_failure;
2071 nla_nest_end(skb, nest_parms);
2072
2073 if (nf_ct_zone(ct)) {
2074 if (nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
2075 goto nla_put_failure;
2076 }
2077
2078 if (ctnetlink_dump_id(skb, ct) < 0)
2079 goto nla_put_failure;
2080
2081 if (ctnetlink_dump_status(skb, ct) < 0)
2082 goto nla_put_failure;
2083
2084 if (ctnetlink_dump_timeout(skb, ct) < 0)
2085 goto nla_put_failure;
2086
2087 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2088 goto nla_put_failure;
2089
2090 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2091 goto nla_put_failure;
2092
2093 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2094 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2095 goto nla_put_failure;
2096 #endif
2097 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2098 goto nla_put_failure;
2099
2100 if ((ct->status & IPS_SEQ_ADJUST) &&
2101 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2102 goto nla_put_failure;
2103
2104 #ifdef CONFIG_NF_CONNTRACK_MARK
2105 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2106 goto nla_put_failure;
2107 #endif
2108 if (ctnetlink_dump_labels(skb, ct) < 0)
2109 goto nla_put_failure;
2110 rcu_read_unlock();
2111 return 0;
2112
2113 nla_put_failure:
2114 rcu_read_unlock();
2115 return -ENOSPC;
2116 }
2117
2118 static int
2119 ctnetlink_nfqueue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2120 {
2121 int err;
2122
2123 if (cda[CTA_TIMEOUT]) {
2124 err = ctnetlink_change_timeout(ct, cda);
2125 if (err < 0)
2126 return err;
2127 }
2128 if (cda[CTA_STATUS]) {
2129 err = ctnetlink_change_status(ct, cda);
2130 if (err < 0)
2131 return err;
2132 }
2133 if (cda[CTA_HELP]) {
2134 err = ctnetlink_change_helper(ct, cda);
2135 if (err < 0)
2136 return err;
2137 }
2138 if (cda[CTA_LABELS]) {
2139 err = ctnetlink_attach_labels(ct, cda);
2140 if (err < 0)
2141 return err;
2142 }
2143 #if defined(CONFIG_NF_CONNTRACK_MARK)
2144 if (cda[CTA_MARK]) {
2145 u32 mask = 0, mark, newmark;
2146 if (cda[CTA_MARK_MASK])
2147 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2148
2149 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2150 newmark = (ct->mark & mask) ^ mark;
2151 if (newmark != ct->mark)
2152 ct->mark = newmark;
2153 }
2154 #endif
2155 return 0;
2156 }
2157
2158 static int
2159 ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
2160 {
2161 struct nlattr *cda[CTA_MAX+1];
2162 int ret;
2163
2164 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2165 if (ret < 0)
2166 return ret;
2167
2168 spin_lock_bh(&nf_conntrack_expect_lock);
2169 ret = ctnetlink_nfqueue_parse_ct((const struct nlattr **)cda, ct);
2170 spin_unlock_bh(&nf_conntrack_expect_lock);
2171
2172 return ret;
2173 }
2174
2175 static int ctnetlink_nfqueue_exp_parse(const struct nlattr * const *cda,
2176 const struct nf_conn *ct,
2177 struct nf_conntrack_tuple *tuple,
2178 struct nf_conntrack_tuple *mask)
2179 {
2180 int err;
2181
2182 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2183 nf_ct_l3num(ct));
2184 if (err < 0)
2185 return err;
2186
2187 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2188 nf_ct_l3num(ct));
2189 }
2190
2191 static int
2192 ctnetlink_nfqueue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2193 u32 portid, u32 report)
2194 {
2195 struct nlattr *cda[CTA_EXPECT_MAX+1];
2196 struct nf_conntrack_tuple tuple, mask;
2197 struct nf_conntrack_helper *helper = NULL;
2198 struct nf_conntrack_expect *exp;
2199 int err;
2200
2201 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2202 if (err < 0)
2203 return err;
2204
2205 err = ctnetlink_nfqueue_exp_parse((const struct nlattr * const *)cda,
2206 ct, &tuple, &mask);
2207 if (err < 0)
2208 return err;
2209
2210 if (cda[CTA_EXPECT_HELP_NAME]) {
2211 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2212
2213 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2214 nf_ct_protonum(ct));
2215 if (helper == NULL)
2216 return -EOPNOTSUPP;
2217 }
2218
2219 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2220 helper, &tuple, &mask);
2221 if (IS_ERR(exp))
2222 return PTR_ERR(exp);
2223
2224 err = nf_ct_expect_related_report(exp, portid, report);
2225 if (err < 0) {
2226 nf_ct_expect_put(exp);
2227 return err;
2228 }
2229
2230 return 0;
2231 }
2232
2233 static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
2234 .build_size = ctnetlink_nfqueue_build_size,
2235 .build = ctnetlink_nfqueue_build,
2236 .parse = ctnetlink_nfqueue_parse,
2237 .attach_expect = ctnetlink_nfqueue_attach_expect,
2238 .seq_adjust = nf_ct_tcp_seqadj_set,
2239 };
2240 #endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
2241
2242 /***********************************************************************
2243 * EXPECT
2244 ***********************************************************************/
2245
2246 static inline int
2247 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2248 const struct nf_conntrack_tuple *tuple,
2249 enum ctattr_expect type)
2250 {
2251 struct nlattr *nest_parms;
2252
2253 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2254 if (!nest_parms)
2255 goto nla_put_failure;
2256 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2257 goto nla_put_failure;
2258 nla_nest_end(skb, nest_parms);
2259
2260 return 0;
2261
2262 nla_put_failure:
2263 return -1;
2264 }
2265
2266 static inline int
2267 ctnetlink_exp_dump_mask(struct sk_buff *skb,
2268 const struct nf_conntrack_tuple *tuple,
2269 const struct nf_conntrack_tuple_mask *mask)
2270 {
2271 int ret;
2272 struct nf_conntrack_l3proto *l3proto;
2273 struct nf_conntrack_l4proto *l4proto;
2274 struct nf_conntrack_tuple m;
2275 struct nlattr *nest_parms;
2276
2277 memset(&m, 0xFF, sizeof(m));
2278 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2279 m.src.u.all = mask->src.u.all;
2280 m.dst.protonum = tuple->dst.protonum;
2281
2282 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2283 if (!nest_parms)
2284 goto nla_put_failure;
2285
2286 rcu_read_lock();
2287 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2288 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2289 if (ret >= 0) {
2290 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2291 tuple->dst.protonum);
2292 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2293 }
2294 rcu_read_unlock();
2295
2296 if (unlikely(ret < 0))
2297 goto nla_put_failure;
2298
2299 nla_nest_end(skb, nest_parms);
2300
2301 return 0;
2302
2303 nla_put_failure:
2304 return -1;
2305 }
2306
2307 static const union nf_inet_addr any_addr;
2308
2309 static int
2310 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2311 const struct nf_conntrack_expect *exp)
2312 {
2313 struct nf_conn *master = exp->master;
2314 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2315 struct nf_conn_help *help;
2316 #ifdef CONFIG_NF_NAT_NEEDED
2317 struct nlattr *nest_parms;
2318 struct nf_conntrack_tuple nat_tuple = {};
2319 #endif
2320 struct nf_ct_helper_expectfn *expfn;
2321
2322 if (timeout < 0)
2323 timeout = 0;
2324
2325 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2326 goto nla_put_failure;
2327 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2328 goto nla_put_failure;
2329 if (ctnetlink_exp_dump_tuple(skb,
2330 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2331 CTA_EXPECT_MASTER) < 0)
2332 goto nla_put_failure;
2333
2334 #ifdef CONFIG_NF_NAT_NEEDED
2335 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2336 exp->saved_proto.all) {
2337 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2338 if (!nest_parms)
2339 goto nla_put_failure;
2340
2341 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2342 goto nla_put_failure;
2343
2344 nat_tuple.src.l3num = nf_ct_l3num(master);
2345 nat_tuple.src.u3 = exp->saved_addr;
2346 nat_tuple.dst.protonum = nf_ct_protonum(master);
2347 nat_tuple.src.u = exp->saved_proto;
2348
2349 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2350 CTA_EXPECT_NAT_TUPLE) < 0)
2351 goto nla_put_failure;
2352 nla_nest_end(skb, nest_parms);
2353 }
2354 #endif
2355 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2356 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2357 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2358 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2359 goto nla_put_failure;
2360 help = nfct_help(master);
2361 if (help) {
2362 struct nf_conntrack_helper *helper;
2363
2364 helper = rcu_dereference(help->helper);
2365 if (helper &&
2366 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2367 goto nla_put_failure;
2368 }
2369 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2370 if (expfn != NULL &&
2371 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2372 goto nla_put_failure;
2373
2374 return 0;
2375
2376 nla_put_failure:
2377 return -1;
2378 }
2379
2380 static int
2381 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2382 int event, const struct nf_conntrack_expect *exp)
2383 {
2384 struct nlmsghdr *nlh;
2385 struct nfgenmsg *nfmsg;
2386 unsigned int flags = portid ? NLM_F_MULTI : 0;
2387
2388 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2389 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2390 if (nlh == NULL)
2391 goto nlmsg_failure;
2392
2393 nfmsg = nlmsg_data(nlh);
2394 nfmsg->nfgen_family = exp->tuple.src.l3num;
2395 nfmsg->version = NFNETLINK_V0;
2396 nfmsg->res_id = 0;
2397
2398 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2399 goto nla_put_failure;
2400
2401 nlmsg_end(skb, nlh);
2402 return skb->len;
2403
2404 nlmsg_failure:
2405 nla_put_failure:
2406 nlmsg_cancel(skb, nlh);
2407 return -1;
2408 }
2409
2410 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2411 static int
2412 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2413 {
2414 struct nf_conntrack_expect *exp = item->exp;
2415 struct net *net = nf_ct_exp_net(exp);
2416 struct nlmsghdr *nlh;
2417 struct nfgenmsg *nfmsg;
2418 struct sk_buff *skb;
2419 unsigned int type, group;
2420 int flags = 0;
2421
2422 if (events & (1 << IPEXP_DESTROY)) {
2423 type = IPCTNL_MSG_EXP_DELETE;
2424 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2425 } else if (events & (1 << IPEXP_NEW)) {
2426 type = IPCTNL_MSG_EXP_NEW;
2427 flags = NLM_F_CREATE|NLM_F_EXCL;
2428 group = NFNLGRP_CONNTRACK_EXP_NEW;
2429 } else
2430 return 0;
2431
2432 if (!item->report && !nfnetlink_has_listeners(net, group))
2433 return 0;
2434
2435 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2436 if (skb == NULL)
2437 goto errout;
2438
2439 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2440 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2441 if (nlh == NULL)
2442 goto nlmsg_failure;
2443
2444 nfmsg = nlmsg_data(nlh);
2445 nfmsg->nfgen_family = exp->tuple.src.l3num;
2446 nfmsg->version = NFNETLINK_V0;
2447 nfmsg->res_id = 0;
2448
2449 rcu_read_lock();
2450 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2451 goto nla_put_failure;
2452 rcu_read_unlock();
2453
2454 nlmsg_end(skb, nlh);
2455 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2456 return 0;
2457
2458 nla_put_failure:
2459 rcu_read_unlock();
2460 nlmsg_cancel(skb, nlh);
2461 nlmsg_failure:
2462 kfree_skb(skb);
2463 errout:
2464 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2465 return 0;
2466 }
2467 #endif
2468 static int ctnetlink_exp_done(struct netlink_callback *cb)
2469 {
2470 if (cb->args[1])
2471 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2472 return 0;
2473 }
2474
2475 static int
2476 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2477 {
2478 struct net *net = sock_net(skb->sk);
2479 struct nf_conntrack_expect *exp, *last;
2480 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2481 u_int8_t l3proto = nfmsg->nfgen_family;
2482
2483 rcu_read_lock();
2484 last = (struct nf_conntrack_expect *)cb->args[1];
2485 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2486 restart:
2487 hlist_for_each_entry(exp, &net->ct.expect_hash[cb->args[0]],
2488 hnode) {
2489 if (l3proto && exp->tuple.src.l3num != l3proto)
2490 continue;
2491 if (cb->args[1]) {
2492 if (exp != last)
2493 continue;
2494 cb->args[1] = 0;
2495 }
2496 if (ctnetlink_exp_fill_info(skb,
2497 NETLINK_CB(cb->skb).portid,
2498 cb->nlh->nlmsg_seq,
2499 IPCTNL_MSG_EXP_NEW,
2500 exp) < 0) {
2501 if (!atomic_inc_not_zero(&exp->use))
2502 continue;
2503 cb->args[1] = (unsigned long)exp;
2504 goto out;
2505 }
2506 }
2507 if (cb->args[1]) {
2508 cb->args[1] = 0;
2509 goto restart;
2510 }
2511 }
2512 out:
2513 rcu_read_unlock();
2514 if (last)
2515 nf_ct_expect_put(last);
2516
2517 return skb->len;
2518 }
2519
2520 static int
2521 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2522 {
2523 struct nf_conntrack_expect *exp, *last;
2524 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2525 struct nf_conn *ct = cb->data;
2526 struct nf_conn_help *help = nfct_help(ct);
2527 u_int8_t l3proto = nfmsg->nfgen_family;
2528
2529 if (cb->args[0])
2530 return 0;
2531
2532 rcu_read_lock();
2533 last = (struct nf_conntrack_expect *)cb->args[1];
2534 restart:
2535 hlist_for_each_entry(exp, &help->expectations, lnode) {
2536 if (l3proto && exp->tuple.src.l3num != l3proto)
2537 continue;
2538 if (cb->args[1]) {
2539 if (exp != last)
2540 continue;
2541 cb->args[1] = 0;
2542 }
2543 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2544 cb->nlh->nlmsg_seq,
2545 IPCTNL_MSG_EXP_NEW,
2546 exp) < 0) {
2547 if (!atomic_inc_not_zero(&exp->use))
2548 continue;
2549 cb->args[1] = (unsigned long)exp;
2550 goto out;
2551 }
2552 }
2553 if (cb->args[1]) {
2554 cb->args[1] = 0;
2555 goto restart;
2556 }
2557 cb->args[0] = 1;
2558 out:
2559 rcu_read_unlock();
2560 if (last)
2561 nf_ct_expect_put(last);
2562
2563 return skb->len;
2564 }
2565
2566 static int ctnetlink_dump_exp_ct(struct sock *ctnl, struct sk_buff *skb,
2567 const struct nlmsghdr *nlh,
2568 const struct nlattr * const cda[])
2569 {
2570 int err;
2571 struct net *net = sock_net(ctnl);
2572 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2573 u_int8_t u3 = nfmsg->nfgen_family;
2574 struct nf_conntrack_tuple tuple;
2575 struct nf_conntrack_tuple_hash *h;
2576 struct nf_conn *ct;
2577 u16 zone = 0;
2578 struct netlink_dump_control c = {
2579 .dump = ctnetlink_exp_ct_dump_table,
2580 .done = ctnetlink_exp_done,
2581 };
2582
2583 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2584 if (err < 0)
2585 return err;
2586
2587 if (cda[CTA_EXPECT_ZONE]) {
2588 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2589 if (err < 0)
2590 return err;
2591 }
2592
2593 h = nf_conntrack_find_get(net, zone, &tuple);
2594 if (!h)
2595 return -ENOENT;
2596
2597 ct = nf_ct_tuplehash_to_ctrack(h);
2598 c.data = ct;
2599
2600 err = netlink_dump_start(ctnl, skb, nlh, &c);
2601 nf_ct_put(ct);
2602
2603 return err;
2604 }
2605
2606 static int
2607 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
2608 const struct nlmsghdr *nlh,
2609 const struct nlattr * const cda[])
2610 {
2611 struct net *net = sock_net(ctnl);
2612 struct nf_conntrack_tuple tuple;
2613 struct nf_conntrack_expect *exp;
2614 struct sk_buff *skb2;
2615 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2616 u_int8_t u3 = nfmsg->nfgen_family;
2617 u16 zone;
2618 int err;
2619
2620 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2621 if (cda[CTA_EXPECT_MASTER])
2622 return ctnetlink_dump_exp_ct(ctnl, skb, nlh, cda);
2623 else {
2624 struct netlink_dump_control c = {
2625 .dump = ctnetlink_exp_dump_table,
2626 .done = ctnetlink_exp_done,
2627 };
2628 return netlink_dump_start(ctnl, skb, nlh, &c);
2629 }
2630 }
2631
2632 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2633 if (err < 0)
2634 return err;
2635
2636 if (cda[CTA_EXPECT_TUPLE])
2637 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2638 else if (cda[CTA_EXPECT_MASTER])
2639 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2640 else
2641 return -EINVAL;
2642
2643 if (err < 0)
2644 return err;
2645
2646 exp = nf_ct_expect_find_get(net, zone, &tuple);
2647 if (!exp)
2648 return -ENOENT;
2649
2650 if (cda[CTA_EXPECT_ID]) {
2651 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2652 if (ntohl(id) != (u32)(unsigned long)exp) {
2653 nf_ct_expect_put(exp);
2654 return -ENOENT;
2655 }
2656 }
2657
2658 err = -ENOMEM;
2659 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2660 if (skb2 == NULL) {
2661 nf_ct_expect_put(exp);
2662 goto out;
2663 }
2664
2665 rcu_read_lock();
2666 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2667 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2668 rcu_read_unlock();
2669 nf_ct_expect_put(exp);
2670 if (err <= 0)
2671 goto free;
2672
2673 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2674 if (err < 0)
2675 goto out;
2676
2677 return 0;
2678
2679 free:
2680 kfree_skb(skb2);
2681 out:
2682 /* this avoids a loop in nfnetlink. */
2683 return err == -EAGAIN ? -ENOBUFS : err;
2684 }
2685
2686 static int
2687 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
2688 const struct nlmsghdr *nlh,
2689 const struct nlattr * const cda[])
2690 {
2691 struct net *net = sock_net(ctnl);
2692 struct nf_conntrack_expect *exp;
2693 struct nf_conntrack_tuple tuple;
2694 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2695 struct hlist_node *next;
2696 u_int8_t u3 = nfmsg->nfgen_family;
2697 unsigned int i;
2698 u16 zone;
2699 int err;
2700
2701 if (cda[CTA_EXPECT_TUPLE]) {
2702 /* delete a single expect by tuple */
2703 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2704 if (err < 0)
2705 return err;
2706
2707 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2708 if (err < 0)
2709 return err;
2710
2711 /* bump usage count to 2 */
2712 exp = nf_ct_expect_find_get(net, zone, &tuple);
2713 if (!exp)
2714 return -ENOENT;
2715
2716 if (cda[CTA_EXPECT_ID]) {
2717 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2718 if (ntohl(id) != (u32)(unsigned long)exp) {
2719 nf_ct_expect_put(exp);
2720 return -ENOENT;
2721 }
2722 }
2723
2724 /* after list removal, usage count == 1 */
2725 spin_lock_bh(&nf_conntrack_expect_lock);
2726 if (del_timer(&exp->timeout)) {
2727 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2728 nlmsg_report(nlh));
2729 nf_ct_expect_put(exp);
2730 }
2731 spin_unlock_bh(&nf_conntrack_expect_lock);
2732 /* have to put what we 'get' above.
2733 * after this line usage count == 0 */
2734 nf_ct_expect_put(exp);
2735 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2736 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2737 struct nf_conn_help *m_help;
2738
2739 /* delete all expectations for this helper */
2740 spin_lock_bh(&nf_conntrack_expect_lock);
2741 for (i = 0; i < nf_ct_expect_hsize; i++) {
2742 hlist_for_each_entry_safe(exp, next,
2743 &net->ct.expect_hash[i],
2744 hnode) {
2745 m_help = nfct_help(exp->master);
2746 if (!strcmp(m_help->helper->name, name) &&
2747 del_timer(&exp->timeout)) {
2748 nf_ct_unlink_expect_report(exp,
2749 NETLINK_CB(skb).portid,
2750 nlmsg_report(nlh));
2751 nf_ct_expect_put(exp);
2752 }
2753 }
2754 }
2755 spin_unlock_bh(&nf_conntrack_expect_lock);
2756 } else {
2757 /* This basically means we have to flush everything*/
2758 spin_lock_bh(&nf_conntrack_expect_lock);
2759 for (i = 0; i < nf_ct_expect_hsize; i++) {
2760 hlist_for_each_entry_safe(exp, next,
2761 &net->ct.expect_hash[i],
2762 hnode) {
2763 if (del_timer(&exp->timeout)) {
2764 nf_ct_unlink_expect_report(exp,
2765 NETLINK_CB(skb).portid,
2766 nlmsg_report(nlh));
2767 nf_ct_expect_put(exp);
2768 }
2769 }
2770 }
2771 spin_unlock_bh(&nf_conntrack_expect_lock);
2772 }
2773
2774 return 0;
2775 }
2776 static int
2777 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2778 const struct nlattr * const cda[])
2779 {
2780 if (cda[CTA_EXPECT_TIMEOUT]) {
2781 if (!del_timer(&x->timeout))
2782 return -ETIME;
2783
2784 x->timeout.expires = jiffies +
2785 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2786 add_timer(&x->timeout);
2787 }
2788 return 0;
2789 }
2790
2791 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2792 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2793 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2794 };
2795
2796 static int
2797 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2798 struct nf_conntrack_expect *exp,
2799 u_int8_t u3)
2800 {
2801 #ifdef CONFIG_NF_NAT_NEEDED
2802 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2803 struct nf_conntrack_tuple nat_tuple = {};
2804 int err;
2805
2806 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2807 if (err < 0)
2808 return err;
2809
2810 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2811 return -EINVAL;
2812
2813 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2814 &nat_tuple, CTA_EXPECT_NAT_TUPLE, u3);
2815 if (err < 0)
2816 return err;
2817
2818 exp->saved_addr = nat_tuple.src.u3;
2819 exp->saved_proto = nat_tuple.src.u;
2820 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2821
2822 return 0;
2823 #else
2824 return -EOPNOTSUPP;
2825 #endif
2826 }
2827
2828 static struct nf_conntrack_expect *
2829 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
2830 struct nf_conntrack_helper *helper,
2831 struct nf_conntrack_tuple *tuple,
2832 struct nf_conntrack_tuple *mask)
2833 {
2834 u_int32_t class = 0;
2835 struct nf_conntrack_expect *exp;
2836 struct nf_conn_help *help;
2837 int err;
2838
2839 if (cda[CTA_EXPECT_CLASS] && helper) {
2840 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
2841 if (class > helper->expect_class_max)
2842 return ERR_PTR(-EINVAL);
2843 }
2844 exp = nf_ct_expect_alloc(ct);
2845 if (!exp)
2846 return ERR_PTR(-ENOMEM);
2847
2848 help = nfct_help(ct);
2849 if (!help) {
2850 if (!cda[CTA_EXPECT_TIMEOUT]) {
2851 err = -EINVAL;
2852 goto err_out;
2853 }
2854 exp->timeout.expires =
2855 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2856
2857 exp->flags = NF_CT_EXPECT_USERSPACE;
2858 if (cda[CTA_EXPECT_FLAGS]) {
2859 exp->flags |=
2860 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2861 }
2862 } else {
2863 if (cda[CTA_EXPECT_FLAGS]) {
2864 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2865 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2866 } else
2867 exp->flags = 0;
2868 }
2869 if (cda[CTA_EXPECT_FN]) {
2870 const char *name = nla_data(cda[CTA_EXPECT_FN]);
2871 struct nf_ct_helper_expectfn *expfn;
2872
2873 expfn = nf_ct_helper_expectfn_find_by_name(name);
2874 if (expfn == NULL) {
2875 err = -EINVAL;
2876 goto err_out;
2877 }
2878 exp->expectfn = expfn->expectfn;
2879 } else
2880 exp->expectfn = NULL;
2881
2882 exp->class = class;
2883 exp->master = ct;
2884 exp->helper = helper;
2885 exp->tuple = *tuple;
2886 exp->mask.src.u3 = mask->src.u3;
2887 exp->mask.src.u.all = mask->src.u.all;
2888
2889 if (cda[CTA_EXPECT_NAT]) {
2890 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
2891 exp, nf_ct_l3num(ct));
2892 if (err < 0)
2893 goto err_out;
2894 }
2895 return exp;
2896 err_out:
2897 nf_ct_expect_put(exp);
2898 return ERR_PTR(err);
2899 }
2900
2901 static int
2902 ctnetlink_create_expect(struct net *net, u16 zone,
2903 const struct nlattr * const cda[],
2904 u_int8_t u3, u32 portid, int report)
2905 {
2906 struct nf_conntrack_tuple tuple, mask, master_tuple;
2907 struct nf_conntrack_tuple_hash *h = NULL;
2908 struct nf_conntrack_helper *helper = NULL;
2909 struct nf_conntrack_expect *exp;
2910 struct nf_conn *ct;
2911 int err;
2912
2913 /* caller guarantees that those three CTA_EXPECT_* exist */
2914 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2915 if (err < 0)
2916 return err;
2917 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2918 if (err < 0)
2919 return err;
2920 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2921 if (err < 0)
2922 return err;
2923
2924 /* Look for master conntrack of this expectation */
2925 h = nf_conntrack_find_get(net, zone, &master_tuple);
2926 if (!h)
2927 return -ENOENT;
2928 ct = nf_ct_tuplehash_to_ctrack(h);
2929
2930 if (cda[CTA_EXPECT_HELP_NAME]) {
2931 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2932
2933 helper = __nf_conntrack_helper_find(helpname, u3,
2934 nf_ct_protonum(ct));
2935 if (helper == NULL) {
2936 #ifdef CONFIG_MODULES
2937 if (request_module("nfct-helper-%s", helpname) < 0) {
2938 err = -EOPNOTSUPP;
2939 goto err_ct;
2940 }
2941 helper = __nf_conntrack_helper_find(helpname, u3,
2942 nf_ct_protonum(ct));
2943 if (helper) {
2944 err = -EAGAIN;
2945 goto err_ct;
2946 }
2947 #endif
2948 err = -EOPNOTSUPP;
2949 goto err_ct;
2950 }
2951 }
2952
2953 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
2954 if (IS_ERR(exp)) {
2955 err = PTR_ERR(exp);
2956 goto err_ct;
2957 }
2958
2959 err = nf_ct_expect_related_report(exp, portid, report);
2960 if (err < 0)
2961 goto err_exp;
2962
2963 return 0;
2964 err_exp:
2965 nf_ct_expect_put(exp);
2966 err_ct:
2967 nf_ct_put(ct);
2968 return err;
2969 }
2970
2971 static int
2972 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2973 const struct nlmsghdr *nlh,
2974 const struct nlattr * const cda[])
2975 {
2976 struct net *net = sock_net(ctnl);
2977 struct nf_conntrack_tuple tuple;
2978 struct nf_conntrack_expect *exp;
2979 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2980 u_int8_t u3 = nfmsg->nfgen_family;
2981 u16 zone;
2982 int err;
2983
2984 if (!cda[CTA_EXPECT_TUPLE]
2985 || !cda[CTA_EXPECT_MASK]
2986 || !cda[CTA_EXPECT_MASTER])
2987 return -EINVAL;
2988
2989 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2990 if (err < 0)
2991 return err;
2992
2993 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2994 if (err < 0)
2995 return err;
2996
2997 spin_lock_bh(&nf_conntrack_expect_lock);
2998 exp = __nf_ct_expect_find(net, zone, &tuple);
2999
3000 if (!exp) {
3001 spin_unlock_bh(&nf_conntrack_expect_lock);
3002 err = -ENOENT;
3003 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3004 err = ctnetlink_create_expect(net, zone, cda,
3005 u3,
3006 NETLINK_CB(skb).portid,
3007 nlmsg_report(nlh));
3008 }
3009 return err;
3010 }
3011
3012 err = -EEXIST;
3013 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3014 err = ctnetlink_change_expect(exp, cda);
3015 spin_unlock_bh(&nf_conntrack_expect_lock);
3016
3017 return err;
3018 }
3019
3020 static int
3021 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3022 const struct ip_conntrack_stat *st)
3023 {
3024 struct nlmsghdr *nlh;
3025 struct nfgenmsg *nfmsg;
3026 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3027
3028 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
3029 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3030 if (nlh == NULL)
3031 goto nlmsg_failure;
3032
3033 nfmsg = nlmsg_data(nlh);
3034 nfmsg->nfgen_family = AF_UNSPEC;
3035 nfmsg->version = NFNETLINK_V0;
3036 nfmsg->res_id = htons(cpu);
3037
3038 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3039 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3040 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3041 goto nla_put_failure;
3042
3043 nlmsg_end(skb, nlh);
3044 return skb->len;
3045
3046 nla_put_failure:
3047 nlmsg_failure:
3048 nlmsg_cancel(skb, nlh);
3049 return -1;
3050 }
3051
3052 static int
3053 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3054 {
3055 int cpu;
3056 struct net *net = sock_net(skb->sk);
3057
3058 if (cb->args[0] == nr_cpu_ids)
3059 return 0;
3060
3061 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3062 const struct ip_conntrack_stat *st;
3063
3064 if (!cpu_possible(cpu))
3065 continue;
3066
3067 st = per_cpu_ptr(net->ct.stat, cpu);
3068 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3069 cb->nlh->nlmsg_seq,
3070 cpu, st) < 0)
3071 break;
3072 }
3073 cb->args[0] = cpu;
3074
3075 return skb->len;
3076 }
3077
3078 static int
3079 ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
3080 const struct nlmsghdr *nlh,
3081 const struct nlattr * const cda[])
3082 {
3083 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3084 struct netlink_dump_control c = {
3085 .dump = ctnetlink_exp_stat_cpu_dump,
3086 };
3087 return netlink_dump_start(ctnl, skb, nlh, &c);
3088 }
3089
3090 return 0;
3091 }
3092
3093 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3094 static struct nf_ct_event_notifier ctnl_notifier = {
3095 .fcn = ctnetlink_conntrack_event,
3096 };
3097
3098 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3099 .fcn = ctnetlink_expect_event,
3100 };
3101 #endif
3102
3103 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3104 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3105 .attr_count = CTA_MAX,
3106 .policy = ct_nla_policy },
3107 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3108 .attr_count = CTA_MAX,
3109 .policy = ct_nla_policy },
3110 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3111 .attr_count = CTA_MAX,
3112 .policy = ct_nla_policy },
3113 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3114 .attr_count = CTA_MAX,
3115 .policy = ct_nla_policy },
3116 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3117 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3118 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3119 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3120 };
3121
3122 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3123 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3124 .attr_count = CTA_EXPECT_MAX,
3125 .policy = exp_nla_policy },
3126 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3127 .attr_count = CTA_EXPECT_MAX,
3128 .policy = exp_nla_policy },
3129 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3130 .attr_count = CTA_EXPECT_MAX,
3131 .policy = exp_nla_policy },
3132 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3133 };
3134
3135 static const struct nfnetlink_subsystem ctnl_subsys = {
3136 .name = "conntrack",
3137 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3138 .cb_count = IPCTNL_MSG_MAX,
3139 .cb = ctnl_cb,
3140 };
3141
3142 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3143 .name = "conntrack_expect",
3144 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3145 .cb_count = IPCTNL_MSG_EXP_MAX,
3146 .cb = ctnl_exp_cb,
3147 };
3148
3149 MODULE_ALIAS("ip_conntrack_netlink");
3150 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3151 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3152
3153 static int __net_init ctnetlink_net_init(struct net *net)
3154 {
3155 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3156 int ret;
3157
3158 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3159 if (ret < 0) {
3160 pr_err("ctnetlink_init: cannot register notifier.\n");
3161 goto err_out;
3162 }
3163
3164 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3165 if (ret < 0) {
3166 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3167 goto err_unreg_notifier;
3168 }
3169 #endif
3170 return 0;
3171
3172 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3173 err_unreg_notifier:
3174 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3175 err_out:
3176 return ret;
3177 #endif
3178 }
3179
3180 static void ctnetlink_net_exit(struct net *net)
3181 {
3182 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3183 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3184 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3185 #endif
3186 }
3187
3188 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3189 {
3190 struct net *net;
3191
3192 list_for_each_entry(net, net_exit_list, exit_list)
3193 ctnetlink_net_exit(net);
3194 }
3195
3196 static struct pernet_operations ctnetlink_net_ops = {
3197 .init = ctnetlink_net_init,
3198 .exit_batch = ctnetlink_net_exit_batch,
3199 };
3200
3201 static int __init ctnetlink_init(void)
3202 {
3203 int ret;
3204
3205 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3206 ret = nfnetlink_subsys_register(&ctnl_subsys);
3207 if (ret < 0) {
3208 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3209 goto err_out;
3210 }
3211
3212 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3213 if (ret < 0) {
3214 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3215 goto err_unreg_subsys;
3216 }
3217
3218 ret = register_pernet_subsys(&ctnetlink_net_ops);
3219 if (ret < 0) {
3220 pr_err("ctnetlink_init: cannot register pernet operations\n");
3221 goto err_unreg_exp_subsys;
3222 }
3223 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3224 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3225 RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
3226 #endif
3227 return 0;
3228
3229 err_unreg_exp_subsys:
3230 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3231 err_unreg_subsys:
3232 nfnetlink_subsys_unregister(&ctnl_subsys);
3233 err_out:
3234 return ret;
3235 }
3236
3237 static void __exit ctnetlink_exit(void)
3238 {
3239 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3240
3241 unregister_pernet_subsys(&ctnetlink_net_ops);
3242 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3243 nfnetlink_subsys_unregister(&ctnl_subsys);
3244 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3245 RCU_INIT_POINTER(nfq_ct_hook, NULL);
3246 #endif
3247 }
3248
3249 module_init(ctnetlink_init);
3250 module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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