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netfilter: ctnetlink: netns support
[firewire-audio.git] / net / netfilter / nf_conntrack_netlink.c
blob79478dfba27ecf0309ada7805d4d64b077c56542
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) 2005-2008 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/skbuff.h>
26 #include <linux/errno.h>
27 #include <linux/netlink.h>
28 #include <linux/spinlock.h>
29 #include <linux/interrupt.h>
30
31 #include <linux/netfilter.h>
32 #include <net/netlink.h>
33 #include <net/sock.h>
34 #include <net/netfilter/nf_conntrack.h>
35 #include <net/netfilter/nf_conntrack_core.h>
36 #include <net/netfilter/nf_conntrack_expect.h>
37 #include <net/netfilter/nf_conntrack_helper.h>
38 #include <net/netfilter/nf_conntrack_l3proto.h>
39 #include <net/netfilter/nf_conntrack_l4proto.h>
40 #include <net/netfilter/nf_conntrack_tuple.h>
41 #include <net/netfilter/nf_conntrack_acct.h>
42 #ifdef CONFIG_NF_NAT_NEEDED
43 #include <net/netfilter/nf_nat_core.h>
44 #include <net/netfilter/nf_nat_protocol.h>
45 #endif
46
47 #include <linux/netfilter/nfnetlink.h>
48 #include <linux/netfilter/nfnetlink_conntrack.h>
49
50 MODULE_LICENSE("GPL");
51
52 static char __initdata version[] = "0.93";
53
54 static inline int
55 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
56 const struct nf_conntrack_tuple *tuple,
57 struct nf_conntrack_l4proto *l4proto)
58 {
59 int ret = 0;
60 struct nlattr *nest_parms;
61
62 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
63 if (!nest_parms)
64 goto nla_put_failure;
65 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
66
67 if (likely(l4proto->tuple_to_nlattr))
68 ret = l4proto->tuple_to_nlattr(skb, tuple);
69
70 nla_nest_end(skb, nest_parms);
71
72 return ret;
73
74 nla_put_failure:
75 return -1;
76 }
77
78 static inline int
79 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
80 const struct nf_conntrack_tuple *tuple,
81 struct nf_conntrack_l3proto *l3proto)
82 {
83 int ret = 0;
84 struct nlattr *nest_parms;
85
86 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
87 if (!nest_parms)
88 goto nla_put_failure;
89
90 if (likely(l3proto->tuple_to_nlattr))
91 ret = l3proto->tuple_to_nlattr(skb, tuple);
92
93 nla_nest_end(skb, nest_parms);
94
95 return ret;
96
97 nla_put_failure:
98 return -1;
99 }
100
101 static int
102 ctnetlink_dump_tuples(struct sk_buff *skb,
103 const struct nf_conntrack_tuple *tuple)
104 {
105 int ret;
106 struct nf_conntrack_l3proto *l3proto;
107 struct nf_conntrack_l4proto *l4proto;
108
109 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
110 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
111
112 if (unlikely(ret < 0))
113 return ret;
114
115 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
116 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
117
118 return ret;
119 }
120
121 static inline int
122 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
123 {
124 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
125 return 0;
126
127 nla_put_failure:
128 return -1;
129 }
130
131 static inline int
132 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
133 {
134 long timeout = (ct->timeout.expires - jiffies) / HZ;
135
136 if (timeout < 0)
137 timeout = 0;
138
139 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
140 return 0;
141
142 nla_put_failure:
143 return -1;
144 }
145
146 static inline int
147 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
148 {
149 struct nf_conntrack_l4proto *l4proto;
150 struct nlattr *nest_proto;
151 int ret;
152
153 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
154 if (!l4proto->to_nlattr)
155 return 0;
156
157 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
158 if (!nest_proto)
159 goto nla_put_failure;
160
161 ret = l4proto->to_nlattr(skb, nest_proto, ct);
162
163 nla_nest_end(skb, nest_proto);
164
165 return ret;
166
167 nla_put_failure:
168 return -1;
169 }
170
171 static inline int
172 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
173 {
174 struct nlattr *nest_helper;
175 const struct nf_conn_help *help = nfct_help(ct);
176 struct nf_conntrack_helper *helper;
177
178 if (!help)
179 return 0;
180
181 helper = rcu_dereference(help->helper);
182 if (!helper)
183 goto out;
184
185 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
186 if (!nest_helper)
187 goto nla_put_failure;
188 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
189
190 if (helper->to_nlattr)
191 helper->to_nlattr(skb, ct);
192
193 nla_nest_end(skb, nest_helper);
194 out:
195 return 0;
196
197 nla_put_failure:
198 return -1;
199 }
200
201 static int
202 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
203 enum ip_conntrack_dir dir)
204 {
205 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
206 struct nlattr *nest_count;
207 const struct nf_conn_counter *acct;
208
209 acct = nf_conn_acct_find(ct);
210 if (!acct)
211 return 0;
212
213 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
214 if (!nest_count)
215 goto nla_put_failure;
216
217 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
218 cpu_to_be64(acct[dir].packets));
219 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
220 cpu_to_be64(acct[dir].bytes));
221
222 nla_nest_end(skb, nest_count);
223
224 return 0;
225
226 nla_put_failure:
227 return -1;
228 }
229
230 #ifdef CONFIG_NF_CONNTRACK_MARK
231 static inline int
232 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
233 {
234 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
235 return 0;
236
237 nla_put_failure:
238 return -1;
239 }
240 #else
241 #define ctnetlink_dump_mark(a, b) (0)
242 #endif
243
244 #ifdef CONFIG_NF_CONNTRACK_SECMARK
245 static inline int
246 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
247 {
248 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
249 return 0;
250
251 nla_put_failure:
252 return -1;
253 }
254 #else
255 #define ctnetlink_dump_secmark(a, b) (0)
256 #endif
257
258 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
259
260 static inline int
261 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
262 {
263 struct nlattr *nest_parms;
264
265 if (!(ct->status & IPS_EXPECTED))
266 return 0;
267
268 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
269 if (!nest_parms)
270 goto nla_put_failure;
271 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
272 goto nla_put_failure;
273 nla_nest_end(skb, nest_parms);
274
275 return 0;
276
277 nla_put_failure:
278 return -1;
279 }
280
281 #ifdef CONFIG_NF_NAT_NEEDED
282 static int
283 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
284 {
285 struct nlattr *nest_parms;
286
287 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
288 if (!nest_parms)
289 goto nla_put_failure;
290
291 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
292 htonl(natseq->correction_pos));
293 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
294 htonl(natseq->offset_before));
295 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
296 htonl(natseq->offset_after));
297
298 nla_nest_end(skb, nest_parms);
299
300 return 0;
301
302 nla_put_failure:
303 return -1;
304 }
305
306 static inline int
307 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
308 {
309 struct nf_nat_seq *natseq;
310 struct nf_conn_nat *nat = nfct_nat(ct);
311
312 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
313 return 0;
314
315 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
316 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
317 return -1;
318
319 natseq = &nat->seq[IP_CT_DIR_REPLY];
320 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
321 return -1;
322
323 return 0;
324 }
325 #else
326 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
327 #endif
328
329 static inline int
330 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
331 {
332 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
333 return 0;
334
335 nla_put_failure:
336 return -1;
337 }
338
339 static inline int
340 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
341 {
342 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
343 return 0;
344
345 nla_put_failure:
346 return -1;
347 }
348
349 static int
350 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
351 int event, struct nf_conn *ct)
352 {
353 struct nlmsghdr *nlh;
354 struct nfgenmsg *nfmsg;
355 struct nlattr *nest_parms;
356 unsigned int flags = pid ? NLM_F_MULTI : 0;
357
358 event |= NFNL_SUBSYS_CTNETLINK << 8;
359 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
360 if (nlh == NULL)
361 goto nlmsg_failure;
362
363 nfmsg = nlmsg_data(nlh);
364 nfmsg->nfgen_family = nf_ct_l3num(ct);
365 nfmsg->version = NFNETLINK_V0;
366 nfmsg->res_id = 0;
367
368 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
369 if (!nest_parms)
370 goto nla_put_failure;
371 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
372 goto nla_put_failure;
373 nla_nest_end(skb, nest_parms);
374
375 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
376 if (!nest_parms)
377 goto nla_put_failure;
378 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
379 goto nla_put_failure;
380 nla_nest_end(skb, nest_parms);
381
382 if (ctnetlink_dump_status(skb, ct) < 0 ||
383 ctnetlink_dump_timeout(skb, ct) < 0 ||
384 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
385 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
386 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
387 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
388 ctnetlink_dump_mark(skb, ct) < 0 ||
389 ctnetlink_dump_secmark(skb, ct) < 0 ||
390 ctnetlink_dump_id(skb, ct) < 0 ||
391 ctnetlink_dump_use(skb, ct) < 0 ||
392 ctnetlink_dump_master(skb, ct) < 0 ||
393 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
394 goto nla_put_failure;
395
396 nlmsg_end(skb, nlh);
397 return skb->len;
398
399 nlmsg_failure:
400 nla_put_failure:
401 nlmsg_cancel(skb, nlh);
402 return -1;
403 }
404
405 #ifdef CONFIG_NF_CONNTRACK_EVENTS
406 static inline size_t
407 ctnetlink_proto_size(const struct nf_conn *ct)
408 {
409 struct nf_conntrack_l3proto *l3proto;
410 struct nf_conntrack_l4proto *l4proto;
411 size_t len = 0;
412
413 rcu_read_lock();
414 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
415 len += l3proto->nla_size;
416
417 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
418 len += l4proto->nla_size;
419 rcu_read_unlock();
420
421 return len;
422 }
423
424 static inline size_t
425 ctnetlink_nlmsg_size(const struct nf_conn *ct)
426 {
427 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
428 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
429 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
430 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
431 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
432 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
433 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
434 #ifdef CONFIG_NF_CT_ACCT
435 + 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
436 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
437 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
438 #endif
439 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
440 + nla_total_size(0) /* CTA_PROTOINFO */
441 + nla_total_size(0) /* CTA_HELP */
442 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
443 #ifdef CONFIG_NF_CONNTRACK_SECMARK
444 + nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
445 #endif
446 #ifdef CONFIG_NF_NAT_NEEDED
447 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
448 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
449 #endif
450 #ifdef CONFIG_NF_CONNTRACK_MARK
451 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
452 #endif
453 + ctnetlink_proto_size(ct)
454 ;
455 }
456
457 static int
458 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
459 {
460 struct net *net;
461 struct nlmsghdr *nlh;
462 struct nfgenmsg *nfmsg;
463 struct nlattr *nest_parms;
464 struct nf_conn *ct = item->ct;
465 struct sk_buff *skb;
466 unsigned int type;
467 unsigned int flags = 0, group;
468 int err;
469
470 /* ignore our fake conntrack entry */
471 if (ct == &nf_conntrack_untracked)
472 return 0;
473
474 if (events & (1 << IPCT_DESTROY)) {
475 type = IPCTNL_MSG_CT_DELETE;
476 group = NFNLGRP_CONNTRACK_DESTROY;
477 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
478 type = IPCTNL_MSG_CT_NEW;
479 flags = NLM_F_CREATE|NLM_F_EXCL;
480 group = NFNLGRP_CONNTRACK_NEW;
481 } else if (events) {
482 type = IPCTNL_MSG_CT_NEW;
483 group = NFNLGRP_CONNTRACK_UPDATE;
484 } else
485 return 0;
486
487 net = nf_ct_net(ct);
488 if (!item->report && !nfnetlink_has_listeners(net, group))
489 return 0;
490
491 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
492 if (skb == NULL)
493 goto errout;
494
495 type |= NFNL_SUBSYS_CTNETLINK << 8;
496 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
497 if (nlh == NULL)
498 goto nlmsg_failure;
499
500 nfmsg = nlmsg_data(nlh);
501 nfmsg->nfgen_family = nf_ct_l3num(ct);
502 nfmsg->version = NFNETLINK_V0;
503 nfmsg->res_id = 0;
504
505 rcu_read_lock();
506 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
507 if (!nest_parms)
508 goto nla_put_failure;
509 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
510 goto nla_put_failure;
511 nla_nest_end(skb, nest_parms);
512
513 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
514 if (!nest_parms)
515 goto nla_put_failure;
516 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
517 goto nla_put_failure;
518 nla_nest_end(skb, nest_parms);
519
520 if (ctnetlink_dump_id(skb, ct) < 0)
521 goto nla_put_failure;
522
523 if (ctnetlink_dump_status(skb, ct) < 0)
524 goto nla_put_failure;
525
526 if (events & (1 << IPCT_DESTROY)) {
527 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
528 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
529 goto nla_put_failure;
530 } else {
531 if (ctnetlink_dump_timeout(skb, ct) < 0)
532 goto nla_put_failure;
533
534 if (events & (1 << IPCT_PROTOINFO)
535 && ctnetlink_dump_protoinfo(skb, ct) < 0)
536 goto nla_put_failure;
537
538 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
539 && ctnetlink_dump_helpinfo(skb, ct) < 0)
540 goto nla_put_failure;
541
542 #ifdef CONFIG_NF_CONNTRACK_SECMARK
543 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
544 && ctnetlink_dump_secmark(skb, ct) < 0)
545 goto nla_put_failure;
546 #endif
547
548 if (events & (1 << IPCT_RELATED) &&
549 ctnetlink_dump_master(skb, ct) < 0)
550 goto nla_put_failure;
551
552 if (events & (1 << IPCT_NATSEQADJ) &&
553 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
554 goto nla_put_failure;
555 }
556
557 #ifdef CONFIG_NF_CONNTRACK_MARK
558 if ((events & (1 << IPCT_MARK) || ct->mark)
559 && ctnetlink_dump_mark(skb, ct) < 0)
560 goto nla_put_failure;
561 #endif
562 rcu_read_unlock();
563
564 nlmsg_end(skb, nlh);
565 err = nfnetlink_send(skb, net, item->pid, group, item->report,
566 GFP_ATOMIC);
567 if (err == -ENOBUFS || err == -EAGAIN)
568 return -ENOBUFS;
569
570 return 0;
571
572 nla_put_failure:
573 rcu_read_unlock();
574 nlmsg_cancel(skb, nlh);
575 nlmsg_failure:
576 kfree_skb(skb);
577 errout:
578 nfnetlink_set_err(net, 0, group, -ENOBUFS);
579 return 0;
580 }
581 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
582
583 static int ctnetlink_done(struct netlink_callback *cb)
584 {
585 if (cb->args[1])
586 nf_ct_put((struct nf_conn *)cb->args[1]);
587 return 0;
588 }
589
590 static int
591 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
592 {
593 struct net *net = sock_net(skb->sk);
594 struct nf_conn *ct, *last;
595 struct nf_conntrack_tuple_hash *h;
596 struct hlist_nulls_node *n;
597 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
598 u_int8_t l3proto = nfmsg->nfgen_family;
599
600 rcu_read_lock();
601 last = (struct nf_conn *)cb->args[1];
602 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
603 restart:
604 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
605 hnnode) {
606 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
607 continue;
608 ct = nf_ct_tuplehash_to_ctrack(h);
609 if (!atomic_inc_not_zero(&ct->ct_general.use))
610 continue;
611 /* Dump entries of a given L3 protocol number.
612 * If it is not specified, ie. l3proto == 0,
613 * then dump everything. */
614 if (l3proto && nf_ct_l3num(ct) != l3proto)
615 goto releasect;
616 if (cb->args[1]) {
617 if (ct != last)
618 goto releasect;
619 cb->args[1] = 0;
620 }
621 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
622 cb->nlh->nlmsg_seq,
623 IPCTNL_MSG_CT_NEW, ct) < 0) {
624 cb->args[1] = (unsigned long)ct;
625 goto out;
626 }
627
628 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
629 IPCTNL_MSG_CT_GET_CTRZERO) {
630 struct nf_conn_counter *acct;
631
632 acct = nf_conn_acct_find(ct);
633 if (acct)
634 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
635 }
636 releasect:
637 nf_ct_put(ct);
638 }
639 if (cb->args[1]) {
640 cb->args[1] = 0;
641 goto restart;
642 }
643 }
644 out:
645 rcu_read_unlock();
646 if (last)
647 nf_ct_put(last);
648
649 return skb->len;
650 }
651
652 static inline int
653 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
654 {
655 struct nlattr *tb[CTA_IP_MAX+1];
656 struct nf_conntrack_l3proto *l3proto;
657 int ret = 0;
658
659 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
660
661 rcu_read_lock();
662 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
663
664 if (likely(l3proto->nlattr_to_tuple)) {
665 ret = nla_validate_nested(attr, CTA_IP_MAX,
666 l3proto->nla_policy);
667 if (ret == 0)
668 ret = l3proto->nlattr_to_tuple(tb, tuple);
669 }
670
671 rcu_read_unlock();
672
673 return ret;
674 }
675
676 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
677 [CTA_PROTO_NUM] = { .type = NLA_U8 },
678 };
679
680 static inline int
681 ctnetlink_parse_tuple_proto(struct nlattr *attr,
682 struct nf_conntrack_tuple *tuple)
683 {
684 struct nlattr *tb[CTA_PROTO_MAX+1];
685 struct nf_conntrack_l4proto *l4proto;
686 int ret = 0;
687
688 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
689 if (ret < 0)
690 return ret;
691
692 if (!tb[CTA_PROTO_NUM])
693 return -EINVAL;
694 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
695
696 rcu_read_lock();
697 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
698
699 if (likely(l4proto->nlattr_to_tuple)) {
700 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
701 l4proto->nla_policy);
702 if (ret == 0)
703 ret = l4proto->nlattr_to_tuple(tb, tuple);
704 }
705
706 rcu_read_unlock();
707
708 return ret;
709 }
710
711 static int
712 ctnetlink_parse_tuple(const struct nlattr * const cda[],
713 struct nf_conntrack_tuple *tuple,
714 enum ctattr_tuple type, u_int8_t l3num)
715 {
716 struct nlattr *tb[CTA_TUPLE_MAX+1];
717 int err;
718
719 memset(tuple, 0, sizeof(*tuple));
720
721 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
722
723 if (!tb[CTA_TUPLE_IP])
724 return -EINVAL;
725
726 tuple->src.l3num = l3num;
727
728 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
729 if (err < 0)
730 return err;
731
732 if (!tb[CTA_TUPLE_PROTO])
733 return -EINVAL;
734
735 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
736 if (err < 0)
737 return err;
738
739 /* orig and expect tuples get DIR_ORIGINAL */
740 if (type == CTA_TUPLE_REPLY)
741 tuple->dst.dir = IP_CT_DIR_REPLY;
742 else
743 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
744
745 return 0;
746 }
747
748 static inline int
749 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
750 {
751 struct nlattr *tb[CTA_HELP_MAX+1];
752
753 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
754
755 if (!tb[CTA_HELP_NAME])
756 return -EINVAL;
757
758 *helper_name = nla_data(tb[CTA_HELP_NAME]);
759
760 return 0;
761 }
762
763 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
764 [CTA_STATUS] = { .type = NLA_U32 },
765 [CTA_TIMEOUT] = { .type = NLA_U32 },
766 [CTA_MARK] = { .type = NLA_U32 },
767 [CTA_USE] = { .type = NLA_U32 },
768 [CTA_ID] = { .type = NLA_U32 },
769 };
770
771 static int
772 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
773 const struct nlmsghdr *nlh,
774 const struct nlattr * const cda[])
775 {
776 struct net *net = sock_net(ctnl);
777 struct nf_conntrack_tuple_hash *h;
778 struct nf_conntrack_tuple tuple;
779 struct nf_conn *ct;
780 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
781 u_int8_t u3 = nfmsg->nfgen_family;
782 int err = 0;
783
784 if (cda[CTA_TUPLE_ORIG])
785 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
786 else if (cda[CTA_TUPLE_REPLY])
787 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
788 else {
789 /* Flush the whole table */
790 nf_conntrack_flush_report(net,
791 NETLINK_CB(skb).pid,
792 nlmsg_report(nlh));
793 return 0;
794 }
795
796 if (err < 0)
797 return err;
798
799 h = nf_conntrack_find_get(net, &tuple);
800 if (!h)
801 return -ENOENT;
802
803 ct = nf_ct_tuplehash_to_ctrack(h);
804
805 if (cda[CTA_ID]) {
806 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
807 if (id != (u32)(unsigned long)ct) {
808 nf_ct_put(ct);
809 return -ENOENT;
810 }
811 }
812
813 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
814 NETLINK_CB(skb).pid,
815 nlmsg_report(nlh)) < 0) {
816 nf_ct_delete_from_lists(ct);
817 /* we failed to report the event, try later */
818 nf_ct_insert_dying_list(ct);
819 nf_ct_put(ct);
820 return 0;
821 }
822
823 /* death_by_timeout would report the event again */
824 set_bit(IPS_DYING_BIT, &ct->status);
825
826 nf_ct_kill(ct);
827 nf_ct_put(ct);
828
829 return 0;
830 }
831
832 static int
833 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
834 const struct nlmsghdr *nlh,
835 const struct nlattr * const cda[])
836 {
837 struct net *net = sock_net(ctnl);
838 struct nf_conntrack_tuple_hash *h;
839 struct nf_conntrack_tuple tuple;
840 struct nf_conn *ct;
841 struct sk_buff *skb2 = NULL;
842 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
843 u_int8_t u3 = nfmsg->nfgen_family;
844 int err = 0;
845
846 if (nlh->nlmsg_flags & NLM_F_DUMP)
847 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
848 ctnetlink_done);
849
850 if (cda[CTA_TUPLE_ORIG])
851 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
852 else if (cda[CTA_TUPLE_REPLY])
853 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
854 else
855 return -EINVAL;
856
857 if (err < 0)
858 return err;
859
860 h = nf_conntrack_find_get(net, &tuple);
861 if (!h)
862 return -ENOENT;
863
864 ct = nf_ct_tuplehash_to_ctrack(h);
865
866 err = -ENOMEM;
867 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
868 if (skb2 == NULL) {
869 nf_ct_put(ct);
870 return -ENOMEM;
871 }
872
873 rcu_read_lock();
874 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
875 IPCTNL_MSG_CT_NEW, ct);
876 rcu_read_unlock();
877 nf_ct_put(ct);
878 if (err <= 0)
879 goto free;
880
881 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
882 if (err < 0)
883 goto out;
884
885 return 0;
886
887 free:
888 kfree_skb(skb2);
889 out:
890 return err;
891 }
892
893 #ifdef CONFIG_NF_NAT_NEEDED
894 static int
895 ctnetlink_parse_nat_setup(struct nf_conn *ct,
896 enum nf_nat_manip_type manip,
897 const struct nlattr *attr)
898 {
899 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
900
901 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
902 if (!parse_nat_setup) {
903 #ifdef CONFIG_MODULES
904 rcu_read_unlock();
905 spin_unlock_bh(&nf_conntrack_lock);
906 nfnl_unlock();
907 if (request_module("nf-nat-ipv4") < 0) {
908 nfnl_lock();
909 spin_lock_bh(&nf_conntrack_lock);
910 rcu_read_lock();
911 return -EOPNOTSUPP;
912 }
913 nfnl_lock();
914 spin_lock_bh(&nf_conntrack_lock);
915 rcu_read_lock();
916 if (nfnetlink_parse_nat_setup_hook)
917 return -EAGAIN;
918 #endif
919 return -EOPNOTSUPP;
920 }
921
922 return parse_nat_setup(ct, manip, attr);
923 }
924 #endif
925
926 static int
927 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
928 {
929 unsigned long d;
930 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
931 d = ct->status ^ status;
932
933 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
934 /* unchangeable */
935 return -EBUSY;
936
937 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
938 /* SEEN_REPLY bit can only be set */
939 return -EBUSY;
940
941 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
942 /* ASSURED bit can only be set */
943 return -EBUSY;
944
945 /* Be careful here, modifying NAT bits can screw up things,
946 * so don't let users modify them directly if they don't pass
947 * nf_nat_range. */
948 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
949 return 0;
950 }
951
952 static int
953 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
954 {
955 #ifdef CONFIG_NF_NAT_NEEDED
956 int ret;
957
958 if (cda[CTA_NAT_DST]) {
959 ret = ctnetlink_parse_nat_setup(ct,
960 IP_NAT_MANIP_DST,
961 cda[CTA_NAT_DST]);
962 if (ret < 0)
963 return ret;
964 }
965 if (cda[CTA_NAT_SRC]) {
966 ret = ctnetlink_parse_nat_setup(ct,
967 IP_NAT_MANIP_SRC,
968 cda[CTA_NAT_SRC]);
969 if (ret < 0)
970 return ret;
971 }
972 return 0;
973 #else
974 return -EOPNOTSUPP;
975 #endif
976 }
977
978 static inline int
979 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
980 {
981 struct nf_conntrack_helper *helper;
982 struct nf_conn_help *help = nfct_help(ct);
983 char *helpname = NULL;
984 int err;
985
986 /* don't change helper of sibling connections */
987 if (ct->master)
988 return -EBUSY;
989
990 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
991 if (err < 0)
992 return err;
993
994 if (!strcmp(helpname, "")) {
995 if (help && help->helper) {
996 /* we had a helper before ... */
997 nf_ct_remove_expectations(ct);
998 rcu_assign_pointer(help->helper, NULL);
999 }
1000
1001 return 0;
1002 }
1003
1004 helper = __nf_conntrack_helper_find_byname(helpname);
1005 if (helper == NULL) {
1006 #ifdef CONFIG_MODULES
1007 spin_unlock_bh(&nf_conntrack_lock);
1008
1009 if (request_module("nfct-helper-%s", helpname) < 0) {
1010 spin_lock_bh(&nf_conntrack_lock);
1011 return -EOPNOTSUPP;
1012 }
1013
1014 spin_lock_bh(&nf_conntrack_lock);
1015 helper = __nf_conntrack_helper_find_byname(helpname);
1016 if (helper)
1017 return -EAGAIN;
1018 #endif
1019 return -EOPNOTSUPP;
1020 }
1021
1022 if (help) {
1023 if (help->helper == helper)
1024 return 0;
1025 if (help->helper)
1026 return -EBUSY;
1027 /* need to zero data of old helper */
1028 memset(&help->help, 0, sizeof(help->help));
1029 } else {
1030 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1031 if (help == NULL)
1032 return -ENOMEM;
1033 }
1034
1035 rcu_assign_pointer(help->helper, helper);
1036
1037 return 0;
1038 }
1039
1040 static inline int
1041 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1042 {
1043 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1044
1045 if (!del_timer(&ct->timeout))
1046 return -ETIME;
1047
1048 ct->timeout.expires = jiffies + timeout * HZ;
1049 add_timer(&ct->timeout);
1050
1051 return 0;
1052 }
1053
1054 static inline int
1055 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1056 {
1057 const struct nlattr *attr = cda[CTA_PROTOINFO];
1058 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1059 struct nf_conntrack_l4proto *l4proto;
1060 int err = 0;
1061
1062 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1063
1064 rcu_read_lock();
1065 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1066 if (l4proto->from_nlattr)
1067 err = l4proto->from_nlattr(tb, ct);
1068 rcu_read_unlock();
1069
1070 return err;
1071 }
1072
1073 #ifdef CONFIG_NF_NAT_NEEDED
1074 static inline int
1075 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1076 {
1077 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1078
1079 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1080
1081 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1082 return -EINVAL;
1083
1084 natseq->correction_pos =
1085 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1086
1087 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1088 return -EINVAL;
1089
1090 natseq->offset_before =
1091 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1092
1093 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1094 return -EINVAL;
1095
1096 natseq->offset_after =
1097 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1098
1099 return 0;
1100 }
1101
1102 static int
1103 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1104 const struct nlattr * const cda[])
1105 {
1106 int ret = 0;
1107 struct nf_conn_nat *nat = nfct_nat(ct);
1108
1109 if (!nat)
1110 return 0;
1111
1112 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1113 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1114 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1115 if (ret < 0)
1116 return ret;
1117
1118 ct->status |= IPS_SEQ_ADJUST;
1119 }
1120
1121 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1122 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1123 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1124 if (ret < 0)
1125 return ret;
1126
1127 ct->status |= IPS_SEQ_ADJUST;
1128 }
1129
1130 return 0;
1131 }
1132 #endif
1133
1134 static int
1135 ctnetlink_change_conntrack(struct nf_conn *ct,
1136 const struct nlattr * const cda[])
1137 {
1138 int err;
1139
1140 /* only allow NAT changes and master assignation for new conntracks */
1141 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1142 return -EOPNOTSUPP;
1143
1144 if (cda[CTA_HELP]) {
1145 err = ctnetlink_change_helper(ct, cda);
1146 if (err < 0)
1147 return err;
1148 }
1149
1150 if (cda[CTA_TIMEOUT]) {
1151 err = ctnetlink_change_timeout(ct, cda);
1152 if (err < 0)
1153 return err;
1154 }
1155
1156 if (cda[CTA_STATUS]) {
1157 err = ctnetlink_change_status(ct, cda);
1158 if (err < 0)
1159 return err;
1160 }
1161
1162 if (cda[CTA_PROTOINFO]) {
1163 err = ctnetlink_change_protoinfo(ct, cda);
1164 if (err < 0)
1165 return err;
1166 }
1167
1168 #if defined(CONFIG_NF_CONNTRACK_MARK)
1169 if (cda[CTA_MARK])
1170 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1171 #endif
1172
1173 #ifdef CONFIG_NF_NAT_NEEDED
1174 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1175 err = ctnetlink_change_nat_seq_adj(ct, cda);
1176 if (err < 0)
1177 return err;
1178 }
1179 #endif
1180
1181 return 0;
1182 }
1183
1184 static struct nf_conn *
1185 ctnetlink_create_conntrack(struct net *net,
1186 const struct nlattr * const cda[],
1187 struct nf_conntrack_tuple *otuple,
1188 struct nf_conntrack_tuple *rtuple,
1189 u8 u3)
1190 {
1191 struct nf_conn *ct;
1192 int err = -EINVAL;
1193 struct nf_conntrack_helper *helper;
1194
1195 ct = nf_conntrack_alloc(net, otuple, rtuple, GFP_ATOMIC);
1196 if (IS_ERR(ct))
1197 return ERR_PTR(-ENOMEM);
1198
1199 if (!cda[CTA_TIMEOUT])
1200 goto err1;
1201 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1202
1203 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1204 ct->status |= IPS_CONFIRMED;
1205
1206 rcu_read_lock();
1207 if (cda[CTA_HELP]) {
1208 char *helpname = NULL;
1209
1210 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1211 if (err < 0)
1212 goto err2;
1213
1214 helper = __nf_conntrack_helper_find_byname(helpname);
1215 if (helper == NULL) {
1216 rcu_read_unlock();
1217 #ifdef CONFIG_MODULES
1218 if (request_module("nfct-helper-%s", helpname) < 0) {
1219 err = -EOPNOTSUPP;
1220 goto err1;
1221 }
1222
1223 rcu_read_lock();
1224 helper = __nf_conntrack_helper_find_byname(helpname);
1225 if (helper) {
1226 err = -EAGAIN;
1227 goto err2;
1228 }
1229 rcu_read_unlock();
1230 #endif
1231 err = -EOPNOTSUPP;
1232 goto err1;
1233 } else {
1234 struct nf_conn_help *help;
1235
1236 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1237 if (help == NULL) {
1238 err = -ENOMEM;
1239 goto err2;
1240 }
1241
1242 /* not in hash table yet so not strictly necessary */
1243 rcu_assign_pointer(help->helper, helper);
1244 }
1245 } else {
1246 /* try an implicit helper assignation */
1247 err = __nf_ct_try_assign_helper(ct, GFP_ATOMIC);
1248 if (err < 0)
1249 goto err2;
1250 }
1251
1252 if (cda[CTA_STATUS]) {
1253 err = ctnetlink_change_status(ct, cda);
1254 if (err < 0)
1255 goto err2;
1256 }
1257
1258 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1259 err = ctnetlink_change_nat(ct, cda);
1260 if (err < 0)
1261 goto err2;
1262 }
1263
1264 #ifdef CONFIG_NF_NAT_NEEDED
1265 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1266 err = ctnetlink_change_nat_seq_adj(ct, cda);
1267 if (err < 0)
1268 goto err2;
1269 }
1270 #endif
1271
1272 if (cda[CTA_PROTOINFO]) {
1273 err = ctnetlink_change_protoinfo(ct, cda);
1274 if (err < 0)
1275 goto err2;
1276 }
1277
1278 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1279 nf_ct_ecache_ext_add(ct, GFP_ATOMIC);
1280
1281 #if defined(CONFIG_NF_CONNTRACK_MARK)
1282 if (cda[CTA_MARK])
1283 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1284 #endif
1285
1286 /* setup master conntrack: this is a confirmed expectation */
1287 if (cda[CTA_TUPLE_MASTER]) {
1288 struct nf_conntrack_tuple master;
1289 struct nf_conntrack_tuple_hash *master_h;
1290 struct nf_conn *master_ct;
1291
1292 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1293 if (err < 0)
1294 goto err2;
1295
1296 master_h = nf_conntrack_find_get(net, &master);
1297 if (master_h == NULL) {
1298 err = -ENOENT;
1299 goto err2;
1300 }
1301 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1302 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1303 ct->master = master_ct;
1304 }
1305
1306 add_timer(&ct->timeout);
1307 nf_conntrack_hash_insert(ct);
1308 rcu_read_unlock();
1309
1310 return ct;
1311
1312 err2:
1313 rcu_read_unlock();
1314 err1:
1315 nf_conntrack_free(ct);
1316 return ERR_PTR(err);
1317 }
1318
1319 static int
1320 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1321 const struct nlmsghdr *nlh,
1322 const struct nlattr * const cda[])
1323 {
1324 struct net *net = sock_net(ctnl);
1325 struct nf_conntrack_tuple otuple, rtuple;
1326 struct nf_conntrack_tuple_hash *h = NULL;
1327 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1328 u_int8_t u3 = nfmsg->nfgen_family;
1329 int err = 0;
1330
1331 if (cda[CTA_TUPLE_ORIG]) {
1332 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1333 if (err < 0)
1334 return err;
1335 }
1336
1337 if (cda[CTA_TUPLE_REPLY]) {
1338 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1339 if (err < 0)
1340 return err;
1341 }
1342
1343 spin_lock_bh(&nf_conntrack_lock);
1344 if (cda[CTA_TUPLE_ORIG])
1345 h = __nf_conntrack_find(net, &otuple);
1346 else if (cda[CTA_TUPLE_REPLY])
1347 h = __nf_conntrack_find(net, &rtuple);
1348
1349 if (h == NULL) {
1350 err = -ENOENT;
1351 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1352 struct nf_conn *ct;
1353 enum ip_conntrack_events events;
1354
1355 ct = ctnetlink_create_conntrack(net, cda, &otuple,
1356 &rtuple, u3);
1357 if (IS_ERR(ct)) {
1358 err = PTR_ERR(ct);
1359 goto out_unlock;
1360 }
1361 err = 0;
1362 nf_conntrack_get(&ct->ct_general);
1363 spin_unlock_bh(&nf_conntrack_lock);
1364 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1365 events = IPCT_RELATED;
1366 else
1367 events = IPCT_NEW;
1368
1369 nf_conntrack_eventmask_report((1 << IPCT_STATUS) |
1370 (1 << IPCT_HELPER) |
1371 (1 << IPCT_PROTOINFO) |
1372 (1 << IPCT_NATSEQADJ) |
1373 (1 << IPCT_MARK) | events,
1374 ct, NETLINK_CB(skb).pid,
1375 nlmsg_report(nlh));
1376 nf_ct_put(ct);
1377 } else
1378 spin_unlock_bh(&nf_conntrack_lock);
1379
1380 return err;
1381 }
1382 /* implicit 'else' */
1383
1384 /* We manipulate the conntrack inside the global conntrack table lock,
1385 * so there's no need to increase the refcount */
1386 err = -EEXIST;
1387 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1388 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1389
1390 err = ctnetlink_change_conntrack(ct, cda);
1391 if (err == 0) {
1392 nf_conntrack_get(&ct->ct_general);
1393 spin_unlock_bh(&nf_conntrack_lock);
1394 nf_conntrack_eventmask_report((1 << IPCT_STATUS) |
1395 (1 << IPCT_HELPER) |
1396 (1 << IPCT_PROTOINFO) |
1397 (1 << IPCT_NATSEQADJ) |
1398 (1 << IPCT_MARK),
1399 ct, NETLINK_CB(skb).pid,
1400 nlmsg_report(nlh));
1401 nf_ct_put(ct);
1402 } else
1403 spin_unlock_bh(&nf_conntrack_lock);
1404
1405 return err;
1406 }
1407
1408 out_unlock:
1409 spin_unlock_bh(&nf_conntrack_lock);
1410 return err;
1411 }
1412
1413 /***********************************************************************
1414 * EXPECT
1415 ***********************************************************************/
1416
1417 static inline int
1418 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1419 const struct nf_conntrack_tuple *tuple,
1420 enum ctattr_expect type)
1421 {
1422 struct nlattr *nest_parms;
1423
1424 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1425 if (!nest_parms)
1426 goto nla_put_failure;
1427 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1428 goto nla_put_failure;
1429 nla_nest_end(skb, nest_parms);
1430
1431 return 0;
1432
1433 nla_put_failure:
1434 return -1;
1435 }
1436
1437 static inline int
1438 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1439 const struct nf_conntrack_tuple *tuple,
1440 const struct nf_conntrack_tuple_mask *mask)
1441 {
1442 int ret;
1443 struct nf_conntrack_l3proto *l3proto;
1444 struct nf_conntrack_l4proto *l4proto;
1445 struct nf_conntrack_tuple m;
1446 struct nlattr *nest_parms;
1447
1448 memset(&m, 0xFF, sizeof(m));
1449 m.src.u.all = mask->src.u.all;
1450 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1451
1452 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1453 if (!nest_parms)
1454 goto nla_put_failure;
1455
1456 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1457 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1458
1459 if (unlikely(ret < 0))
1460 goto nla_put_failure;
1461
1462 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1463 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1464 if (unlikely(ret < 0))
1465 goto nla_put_failure;
1466
1467 nla_nest_end(skb, nest_parms);
1468
1469 return 0;
1470
1471 nla_put_failure:
1472 return -1;
1473 }
1474
1475 static int
1476 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1477 const struct nf_conntrack_expect *exp)
1478 {
1479 struct nf_conn *master = exp->master;
1480 long timeout = (exp->timeout.expires - jiffies) / HZ;
1481
1482 if (timeout < 0)
1483 timeout = 0;
1484
1485 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1486 goto nla_put_failure;
1487 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1488 goto nla_put_failure;
1489 if (ctnetlink_exp_dump_tuple(skb,
1490 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1491 CTA_EXPECT_MASTER) < 0)
1492 goto nla_put_failure;
1493
1494 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1495 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1496
1497 return 0;
1498
1499 nla_put_failure:
1500 return -1;
1501 }
1502
1503 static int
1504 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1505 int event, const struct nf_conntrack_expect *exp)
1506 {
1507 struct nlmsghdr *nlh;
1508 struct nfgenmsg *nfmsg;
1509 unsigned int flags = pid ? NLM_F_MULTI : 0;
1510
1511 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1512 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1513 if (nlh == NULL)
1514 goto nlmsg_failure;
1515
1516 nfmsg = nlmsg_data(nlh);
1517 nfmsg->nfgen_family = exp->tuple.src.l3num;
1518 nfmsg->version = NFNETLINK_V0;
1519 nfmsg->res_id = 0;
1520
1521 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1522 goto nla_put_failure;
1523
1524 nlmsg_end(skb, nlh);
1525 return skb->len;
1526
1527 nlmsg_failure:
1528 nla_put_failure:
1529 nlmsg_cancel(skb, nlh);
1530 return -1;
1531 }
1532
1533 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1534 static int
1535 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1536 {
1537 struct nf_conntrack_expect *exp = item->exp;
1538 struct net *net = nf_ct_exp_net(exp);
1539 struct nlmsghdr *nlh;
1540 struct nfgenmsg *nfmsg;
1541 struct sk_buff *skb;
1542 unsigned int type;
1543 int flags = 0;
1544
1545 if (events & (1 << IPEXP_NEW)) {
1546 type = IPCTNL_MSG_EXP_NEW;
1547 flags = NLM_F_CREATE|NLM_F_EXCL;
1548 } else
1549 return 0;
1550
1551 if (!item->report &&
1552 !nfnetlink_has_listeners(net, NFNLGRP_CONNTRACK_EXP_NEW))
1553 return 0;
1554
1555 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1556 if (skb == NULL)
1557 goto errout;
1558
1559 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1560 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1561 if (nlh == NULL)
1562 goto nlmsg_failure;
1563
1564 nfmsg = nlmsg_data(nlh);
1565 nfmsg->nfgen_family = exp->tuple.src.l3num;
1566 nfmsg->version = NFNETLINK_V0;
1567 nfmsg->res_id = 0;
1568
1569 rcu_read_lock();
1570 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1571 goto nla_put_failure;
1572 rcu_read_unlock();
1573
1574 nlmsg_end(skb, nlh);
1575 nfnetlink_send(skb, net, item->pid, NFNLGRP_CONNTRACK_EXP_NEW,
1576 item->report, GFP_ATOMIC);
1577 return 0;
1578
1579 nla_put_failure:
1580 rcu_read_unlock();
1581 nlmsg_cancel(skb, nlh);
1582 nlmsg_failure:
1583 kfree_skb(skb);
1584 errout:
1585 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1586 return 0;
1587 }
1588 #endif
1589 static int ctnetlink_exp_done(struct netlink_callback *cb)
1590 {
1591 if (cb->args[1])
1592 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1593 return 0;
1594 }
1595
1596 static int
1597 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1598 {
1599 struct net *net = sock_net(skb->sk);
1600 struct nf_conntrack_expect *exp, *last;
1601 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1602 struct hlist_node *n;
1603 u_int8_t l3proto = nfmsg->nfgen_family;
1604
1605 rcu_read_lock();
1606 last = (struct nf_conntrack_expect *)cb->args[1];
1607 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1608 restart:
1609 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1610 hnode) {
1611 if (l3proto && exp->tuple.src.l3num != l3proto)
1612 continue;
1613 if (cb->args[1]) {
1614 if (exp != last)
1615 continue;
1616 cb->args[1] = 0;
1617 }
1618 if (ctnetlink_exp_fill_info(skb,
1619 NETLINK_CB(cb->skb).pid,
1620 cb->nlh->nlmsg_seq,
1621 IPCTNL_MSG_EXP_NEW,
1622 exp) < 0) {
1623 if (!atomic_inc_not_zero(&exp->use))
1624 continue;
1625 cb->args[1] = (unsigned long)exp;
1626 goto out;
1627 }
1628 }
1629 if (cb->args[1]) {
1630 cb->args[1] = 0;
1631 goto restart;
1632 }
1633 }
1634 out:
1635 rcu_read_unlock();
1636 if (last)
1637 nf_ct_expect_put(last);
1638
1639 return skb->len;
1640 }
1641
1642 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1643 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1644 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1645 };
1646
1647 static int
1648 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1649 const struct nlmsghdr *nlh,
1650 const struct nlattr * const cda[])
1651 {
1652 struct net *net = sock_net(ctnl);
1653 struct nf_conntrack_tuple tuple;
1654 struct nf_conntrack_expect *exp;
1655 struct sk_buff *skb2;
1656 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1657 u_int8_t u3 = nfmsg->nfgen_family;
1658 int err = 0;
1659
1660 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1661 return netlink_dump_start(ctnl, skb, nlh,
1662 ctnetlink_exp_dump_table,
1663 ctnetlink_exp_done);
1664 }
1665
1666 if (cda[CTA_EXPECT_MASTER])
1667 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1668 else
1669 return -EINVAL;
1670
1671 if (err < 0)
1672 return err;
1673
1674 exp = nf_ct_expect_find_get(net, &tuple);
1675 if (!exp)
1676 return -ENOENT;
1677
1678 if (cda[CTA_EXPECT_ID]) {
1679 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1680 if (ntohl(id) != (u32)(unsigned long)exp) {
1681 nf_ct_expect_put(exp);
1682 return -ENOENT;
1683 }
1684 }
1685
1686 err = -ENOMEM;
1687 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1688 if (skb2 == NULL)
1689 goto out;
1690
1691 rcu_read_lock();
1692 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1693 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1694 rcu_read_unlock();
1695 if (err <= 0)
1696 goto free;
1697
1698 nf_ct_expect_put(exp);
1699
1700 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1701
1702 free:
1703 kfree_skb(skb2);
1704 out:
1705 nf_ct_expect_put(exp);
1706 return err;
1707 }
1708
1709 static int
1710 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1711 const struct nlmsghdr *nlh,
1712 const struct nlattr * const cda[])
1713 {
1714 struct net *net = sock_net(ctnl);
1715 struct nf_conntrack_expect *exp;
1716 struct nf_conntrack_tuple tuple;
1717 struct nf_conntrack_helper *h;
1718 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1719 struct hlist_node *n, *next;
1720 u_int8_t u3 = nfmsg->nfgen_family;
1721 unsigned int i;
1722 int err;
1723
1724 if (cda[CTA_EXPECT_TUPLE]) {
1725 /* delete a single expect by tuple */
1726 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1727 if (err < 0)
1728 return err;
1729
1730 /* bump usage count to 2 */
1731 exp = nf_ct_expect_find_get(net, &tuple);
1732 if (!exp)
1733 return -ENOENT;
1734
1735 if (cda[CTA_EXPECT_ID]) {
1736 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1737 if (ntohl(id) != (u32)(unsigned long)exp) {
1738 nf_ct_expect_put(exp);
1739 return -ENOENT;
1740 }
1741 }
1742
1743 /* after list removal, usage count == 1 */
1744 nf_ct_unexpect_related(exp);
1745 /* have to put what we 'get' above.
1746 * after this line usage count == 0 */
1747 nf_ct_expect_put(exp);
1748 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1749 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1750 struct nf_conn_help *m_help;
1751
1752 /* delete all expectations for this helper */
1753 spin_lock_bh(&nf_conntrack_lock);
1754 h = __nf_conntrack_helper_find_byname(name);
1755 if (!h) {
1756 spin_unlock_bh(&nf_conntrack_lock);
1757 return -EOPNOTSUPP;
1758 }
1759 for (i = 0; i < nf_ct_expect_hsize; i++) {
1760 hlist_for_each_entry_safe(exp, n, next,
1761 &net->ct.expect_hash[i],
1762 hnode) {
1763 m_help = nfct_help(exp->master);
1764 if (m_help->helper == h
1765 && del_timer(&exp->timeout)) {
1766 nf_ct_unlink_expect(exp);
1767 nf_ct_expect_put(exp);
1768 }
1769 }
1770 }
1771 spin_unlock_bh(&nf_conntrack_lock);
1772 } else {
1773 /* This basically means we have to flush everything*/
1774 spin_lock_bh(&nf_conntrack_lock);
1775 for (i = 0; i < nf_ct_expect_hsize; i++) {
1776 hlist_for_each_entry_safe(exp, n, next,
1777 &net->ct.expect_hash[i],
1778 hnode) {
1779 if (del_timer(&exp->timeout)) {
1780 nf_ct_unlink_expect(exp);
1781 nf_ct_expect_put(exp);
1782 }
1783 }
1784 }
1785 spin_unlock_bh(&nf_conntrack_lock);
1786 }
1787
1788 return 0;
1789 }
1790 static int
1791 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1792 const struct nlattr * const cda[])
1793 {
1794 return -EOPNOTSUPP;
1795 }
1796
1797 static int
1798 ctnetlink_create_expect(struct net *net, const struct nlattr * const cda[],
1799 u_int8_t u3,
1800 u32 pid, int report)
1801 {
1802 struct nf_conntrack_tuple tuple, mask, master_tuple;
1803 struct nf_conntrack_tuple_hash *h = NULL;
1804 struct nf_conntrack_expect *exp;
1805 struct nf_conn *ct;
1806 struct nf_conn_help *help;
1807 int err = 0;
1808
1809 /* caller guarantees that those three CTA_EXPECT_* exist */
1810 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1811 if (err < 0)
1812 return err;
1813 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1814 if (err < 0)
1815 return err;
1816 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1817 if (err < 0)
1818 return err;
1819
1820 /* Look for master conntrack of this expectation */
1821 h = nf_conntrack_find_get(net, &master_tuple);
1822 if (!h)
1823 return -ENOENT;
1824 ct = nf_ct_tuplehash_to_ctrack(h);
1825 help = nfct_help(ct);
1826
1827 if (!help || !help->helper) {
1828 /* such conntrack hasn't got any helper, abort */
1829 err = -EOPNOTSUPP;
1830 goto out;
1831 }
1832
1833 exp = nf_ct_expect_alloc(ct);
1834 if (!exp) {
1835 err = -ENOMEM;
1836 goto out;
1837 }
1838
1839 exp->class = 0;
1840 exp->expectfn = NULL;
1841 exp->flags = 0;
1842 exp->master = ct;
1843 exp->helper = NULL;
1844 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1845 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1846 exp->mask.src.u.all = mask.src.u.all;
1847
1848 err = nf_ct_expect_related_report(exp, pid, report);
1849 nf_ct_expect_put(exp);
1850
1851 out:
1852 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1853 return err;
1854 }
1855
1856 static int
1857 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1858 const struct nlmsghdr *nlh,
1859 const struct nlattr * const cda[])
1860 {
1861 struct net *net = sock_net(ctnl);
1862 struct nf_conntrack_tuple tuple;
1863 struct nf_conntrack_expect *exp;
1864 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1865 u_int8_t u3 = nfmsg->nfgen_family;
1866 int err = 0;
1867
1868 if (!cda[CTA_EXPECT_TUPLE]
1869 || !cda[CTA_EXPECT_MASK]
1870 || !cda[CTA_EXPECT_MASTER])
1871 return -EINVAL;
1872
1873 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1874 if (err < 0)
1875 return err;
1876
1877 spin_lock_bh(&nf_conntrack_lock);
1878 exp = __nf_ct_expect_find(net, &tuple);
1879
1880 if (!exp) {
1881 spin_unlock_bh(&nf_conntrack_lock);
1882 err = -ENOENT;
1883 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1884 err = ctnetlink_create_expect(net, cda,
1885 u3,
1886 NETLINK_CB(skb).pid,
1887 nlmsg_report(nlh));
1888 }
1889 return err;
1890 }
1891
1892 err = -EEXIST;
1893 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1894 err = ctnetlink_change_expect(exp, cda);
1895 spin_unlock_bh(&nf_conntrack_lock);
1896
1897 return err;
1898 }
1899
1900 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1901 static struct nf_ct_event_notifier ctnl_notifier = {
1902 .fcn = ctnetlink_conntrack_event,
1903 };
1904
1905 static struct nf_exp_event_notifier ctnl_notifier_exp = {
1906 .fcn = ctnetlink_expect_event,
1907 };
1908 #endif
1909
1910 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1911 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1912 .attr_count = CTA_MAX,
1913 .policy = ct_nla_policy },
1914 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1915 .attr_count = CTA_MAX,
1916 .policy = ct_nla_policy },
1917 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1918 .attr_count = CTA_MAX,
1919 .policy = ct_nla_policy },
1920 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1921 .attr_count = CTA_MAX,
1922 .policy = ct_nla_policy },
1923 };
1924
1925 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1926 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1927 .attr_count = CTA_EXPECT_MAX,
1928 .policy = exp_nla_policy },
1929 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1930 .attr_count = CTA_EXPECT_MAX,
1931 .policy = exp_nla_policy },
1932 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1933 .attr_count = CTA_EXPECT_MAX,
1934 .policy = exp_nla_policy },
1935 };
1936
1937 static const struct nfnetlink_subsystem ctnl_subsys = {
1938 .name = "conntrack",
1939 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1940 .cb_count = IPCTNL_MSG_MAX,
1941 .cb = ctnl_cb,
1942 };
1943
1944 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1945 .name = "conntrack_expect",
1946 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1947 .cb_count = IPCTNL_MSG_EXP_MAX,
1948 .cb = ctnl_exp_cb,
1949 };
1950
1951 MODULE_ALIAS("ip_conntrack_netlink");
1952 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1953 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1954
1955 static int __init ctnetlink_init(void)
1956 {
1957 int ret;
1958
1959 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1960 ret = nfnetlink_subsys_register(&ctnl_subsys);
1961 if (ret < 0) {
1962 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1963 goto err_out;
1964 }
1965
1966 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1967 if (ret < 0) {
1968 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1969 goto err_unreg_subsys;
1970 }
1971
1972 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1973 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1974 if (ret < 0) {
1975 printk("ctnetlink_init: cannot register notifier.\n");
1976 goto err_unreg_exp_subsys;
1977 }
1978
1979 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1980 if (ret < 0) {
1981 printk("ctnetlink_init: cannot expect register notifier.\n");
1982 goto err_unreg_notifier;
1983 }
1984 #endif
1985
1986 return 0;
1987
1988 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1989 err_unreg_notifier:
1990 nf_conntrack_unregister_notifier(&ctnl_notifier);
1991 err_unreg_exp_subsys:
1992 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1993 #endif
1994 err_unreg_subsys:
1995 nfnetlink_subsys_unregister(&ctnl_subsys);
1996 err_out:
1997 return ret;
1998 }
1999
2000 static void __exit ctnetlink_exit(void)
2001 {
2002 printk("ctnetlink: unregistering from nfnetlink.\n");
2003
2004 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2005 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2006 nf_conntrack_unregister_notifier(&ctnl_notifier);
2007 #endif
2008
2009 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2010 nfnetlink_subsys_unregister(&ctnl_subsys);
2011 return;
2012 }
2013
2014 module_init(ctnetlink_init);
2015 module_exit(ctnetlink_exit);
AMDTP streaming driver for the Linux FireWire stack (Juju)