d4eedc68cc76d19642754dd678cbf57433ecb4c6
[linux-2.6.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) 2005-2007 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/types.h>
22 #include <linux/timer.h>
23 #include <linux/skbuff.h>
24 #include <linux/errno.h>
25 #include <linux/netlink.h>
26 #include <linux/spinlock.h>
27 #include <linux/interrupt.h>
28 #include <linux/notifier.h>
29
30 #include <linux/netfilter.h>
31 #include <net/netlink.h>
32 #include <net/netfilter/nf_conntrack.h>
33 #include <net/netfilter/nf_conntrack_core.h>
34 #include <net/netfilter/nf_conntrack_expect.h>
35 #include <net/netfilter/nf_conntrack_helper.h>
36 #include <net/netfilter/nf_conntrack_l3proto.h>
37 #include <net/netfilter/nf_conntrack_l4proto.h>
38 #include <net/netfilter/nf_conntrack_tuple.h>
39 #ifdef CONFIG_NF_NAT_NEEDED
40 #include <net/netfilter/nf_nat_core.h>
41 #include <net/netfilter/nf_nat_protocol.h>
42 #endif
43
44 #include <linux/netfilter/nfnetlink.h>
45 #include <linux/netfilter/nfnetlink_conntrack.h>
46
47 MODULE_LICENSE("GPL");
48
49 static char __initdata version[] = "0.93";
50
51 static inline int
52 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
53                             const struct nf_conntrack_tuple *tuple,
54                             struct nf_conntrack_l4proto *l4proto)
55 {
56         int ret = 0;
57         struct nlattr *nest_parms;
58
59         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
60         if (!nest_parms)
61                 goto nla_put_failure;
62         NLA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
63
64         if (likely(l4proto->tuple_to_nlattr))
65                 ret = l4proto->tuple_to_nlattr(skb, tuple);
66
67         nla_nest_end(skb, nest_parms);
68
69         return ret;
70
71 nla_put_failure:
72         return -1;
73 }
74
75 static inline int
76 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
77                          const struct nf_conntrack_tuple *tuple,
78                          struct nf_conntrack_l3proto *l3proto)
79 {
80         int ret = 0;
81         struct nlattr *nest_parms;
82
83         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
84         if (!nest_parms)
85                 goto nla_put_failure;
86
87         if (likely(l3proto->tuple_to_nlattr))
88                 ret = l3proto->tuple_to_nlattr(skb, tuple);
89
90         nla_nest_end(skb, nest_parms);
91
92         return ret;
93
94 nla_put_failure:
95         return -1;
96 }
97
98 static inline int
99 ctnetlink_dump_tuples(struct sk_buff *skb,
100                       const struct nf_conntrack_tuple *tuple)
101 {
102         int ret;
103         struct nf_conntrack_l3proto *l3proto;
104         struct nf_conntrack_l4proto *l4proto;
105
106         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
107         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
108         nf_ct_l3proto_put(l3proto);
109
110         if (unlikely(ret < 0))
111                 return ret;
112
113         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
114         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
115         nf_ct_l4proto_put(l4proto);
116
117         return ret;
118 }
119
120 static inline int
121 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
122 {
123         __be32 status = htonl((u_int32_t) ct->status);
124         NLA_PUT(skb, CTA_STATUS, sizeof(status), &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_l = ct->timeout.expires - jiffies;
135         __be32 timeout;
136
137         if (timeout_l < 0)
138                 timeout = 0;
139         else
140                 timeout = htonl(timeout_l / HZ);
141
142         NLA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
143         return 0;
144
145 nla_put_failure:
146         return -1;
147 }
148
149 static inline int
150 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
151 {
152         struct nf_conntrack_l4proto *l4proto = nf_ct_l4proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
153         struct nlattr *nest_proto;
154         int ret;
155
156         if (!l4proto->to_nlattr) {
157                 nf_ct_l4proto_put(l4proto);
158                 return 0;
159         }
160
161         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
162         if (!nest_proto)
163                 goto nla_put_failure;
164
165         ret = l4proto->to_nlattr(skb, nest_proto, ct);
166
167         nf_ct_l4proto_put(l4proto);
168
169         nla_nest_end(skb, nest_proto);
170
171         return ret;
172
173 nla_put_failure:
174         nf_ct_l4proto_put(l4proto);
175         return -1;
176 }
177
178 static inline int
179 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
180 {
181         struct nlattr *nest_helper;
182         const struct nf_conn_help *help = nfct_help(ct);
183         struct nf_conntrack_helper *helper;
184
185         if (!help)
186                 return 0;
187
188         rcu_read_lock();
189         helper = rcu_dereference(help->helper);
190         if (!helper)
191                 goto out;
192
193         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
194         if (!nest_helper)
195                 goto nla_put_failure;
196         NLA_PUT(skb, CTA_HELP_NAME, strlen(helper->name), helper->name);
197
198         if (helper->to_nlattr)
199                 helper->to_nlattr(skb, ct);
200
201         nla_nest_end(skb, nest_helper);
202 out:
203         rcu_read_unlock();
204         return 0;
205
206 nla_put_failure:
207         rcu_read_unlock();
208         return -1;
209 }
210
211 #ifdef CONFIG_NF_CT_ACCT
212 static inline int
213 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
214                         enum ip_conntrack_dir dir)
215 {
216         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
217         struct nlattr *nest_count;
218         __be32 tmp;
219
220         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
221         if (!nest_count)
222                 goto nla_put_failure;
223
224         tmp = htonl(ct->counters[dir].packets);
225         NLA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
226
227         tmp = htonl(ct->counters[dir].bytes);
228         NLA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
229
230         nla_nest_end(skb, nest_count);
231
232         return 0;
233
234 nla_put_failure:
235         return -1;
236 }
237 #else
238 #define ctnetlink_dump_counters(a, b, c) (0)
239 #endif
240
241 #ifdef CONFIG_NF_CONNTRACK_MARK
242 static inline int
243 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
244 {
245         __be32 mark = htonl(ct->mark);
246
247         NLA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
248         return 0;
249
250 nla_put_failure:
251         return -1;
252 }
253 #else
254 #define ctnetlink_dump_mark(a, b) (0)
255 #endif
256
257 #ifdef CONFIG_NF_CONNTRACK_SECMARK
258 static inline int
259 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
260 {
261         __be32 mark = htonl(ct->secmark);
262
263         NLA_PUT(skb, CTA_SECMARK, sizeof(u_int32_t), &mark);
264         return 0;
265
266 nla_put_failure:
267         return -1;
268 }
269 #else
270 #define ctnetlink_dump_secmark(a, b) (0)
271 #endif
272
273 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
274
275 static inline int
276 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
277 {
278         struct nlattr *nest_parms;
279
280         if (!(ct->status & IPS_EXPECTED))
281                 return 0;
282
283         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
284         if (!nest_parms)
285                 goto nla_put_failure;
286         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
287                 goto nla_put_failure;
288         nla_nest_end(skb, nest_parms);
289
290         return 0;
291
292 nla_put_failure:
293         return -1;
294 }
295
296 #ifdef CONFIG_NF_NAT_NEEDED
297 static inline int
298 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
299 {
300         __be32 tmp;
301         struct nlattr *nest_parms;
302
303         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
304         if (!nest_parms)
305                 goto nla_put_failure;
306
307         tmp = htonl(natseq->correction_pos);
308         NLA_PUT(skb, CTA_NAT_SEQ_CORRECTION_POS, sizeof(tmp), &tmp);
309         tmp = htonl(natseq->offset_before);
310         NLA_PUT(skb, CTA_NAT_SEQ_OFFSET_BEFORE, sizeof(tmp), &tmp);
311         tmp = htonl(natseq->offset_after);
312         NLA_PUT(skb, CTA_NAT_SEQ_OFFSET_AFTER, sizeof(tmp), &tmp);
313
314         nla_nest_end(skb, nest_parms);
315
316         return 0;
317
318 nla_put_failure:
319         return -1;
320 }
321
322 static inline int
323 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
324 {
325         struct nf_nat_seq *natseq;
326         struct nf_conn_nat *nat = nfct_nat(ct);
327
328         if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
329                 return 0;
330
331         natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
332         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
333                 return -1;
334
335         natseq = &nat->seq[IP_CT_DIR_REPLY];
336         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
337                 return -1;
338
339         return 0;
340 }
341 #else
342 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
343 #endif
344
345 static inline int
346 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
347 {
348         __be32 id = htonl((unsigned long)ct);
349         NLA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
350         return 0;
351
352 nla_put_failure:
353         return -1;
354 }
355
356 static inline int
357 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
358 {
359         __be32 use = htonl(atomic_read(&ct->ct_general.use));
360
361         NLA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
362         return 0;
363
364 nla_put_failure:
365         return -1;
366 }
367
368 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
369
370 static int
371 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
372                     int event, int nowait,
373                     const struct nf_conn *ct)
374 {
375         struct nlmsghdr *nlh;
376         struct nfgenmsg *nfmsg;
377         struct nlattr *nest_parms;
378         unsigned char *b = skb_tail_pointer(skb);
379
380         event |= NFNL_SUBSYS_CTNETLINK << 8;
381         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
382         nfmsg  = NLMSG_DATA(nlh);
383
384         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
385         nfmsg->nfgen_family =
386                 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
387         nfmsg->version      = NFNETLINK_V0;
388         nfmsg->res_id       = 0;
389
390         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
391         if (!nest_parms)
392                 goto nla_put_failure;
393         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
394                 goto nla_put_failure;
395         nla_nest_end(skb, nest_parms);
396
397         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
398         if (!nest_parms)
399                 goto nla_put_failure;
400         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
401                 goto nla_put_failure;
402         nla_nest_end(skb, nest_parms);
403
404         if (ctnetlink_dump_status(skb, ct) < 0 ||
405             ctnetlink_dump_timeout(skb, ct) < 0 ||
406             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
407             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
408             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
409             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
410             ctnetlink_dump_mark(skb, ct) < 0 ||
411             ctnetlink_dump_secmark(skb, ct) < 0 ||
412             ctnetlink_dump_id(skb, ct) < 0 ||
413             ctnetlink_dump_use(skb, ct) < 0 ||
414             ctnetlink_dump_master(skb, ct) < 0 ||
415             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
416                 goto nla_put_failure;
417
418         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
419         return skb->len;
420
421 nlmsg_failure:
422 nla_put_failure:
423         nlmsg_trim(skb, b);
424         return -1;
425 }
426
427 #ifdef CONFIG_NF_CONNTRACK_EVENTS
428 static int ctnetlink_conntrack_event(struct notifier_block *this,
429                                      unsigned long events, void *ptr)
430 {
431         struct nlmsghdr *nlh;
432         struct nfgenmsg *nfmsg;
433         struct nlattr *nest_parms;
434         struct nf_conn *ct = (struct nf_conn *)ptr;
435         struct sk_buff *skb;
436         unsigned int type;
437         sk_buff_data_t b;
438         unsigned int flags = 0, group;
439
440         /* ignore our fake conntrack entry */
441         if (ct == &nf_conntrack_untracked)
442                 return NOTIFY_DONE;
443
444         if (events & IPCT_DESTROY) {
445                 type = IPCTNL_MSG_CT_DELETE;
446                 group = NFNLGRP_CONNTRACK_DESTROY;
447         } else  if (events & (IPCT_NEW | IPCT_RELATED)) {
448                 type = IPCTNL_MSG_CT_NEW;
449                 flags = NLM_F_CREATE|NLM_F_EXCL;
450                 group = NFNLGRP_CONNTRACK_NEW;
451         } else  if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
452                 type = IPCTNL_MSG_CT_NEW;
453                 group = NFNLGRP_CONNTRACK_UPDATE;
454         } else
455                 return NOTIFY_DONE;
456
457         if (!nfnetlink_has_listeners(group))
458                 return NOTIFY_DONE;
459
460         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
461         if (!skb)
462                 return NOTIFY_DONE;
463
464         b = skb->tail;
465
466         type |= NFNL_SUBSYS_CTNETLINK << 8;
467         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
468         nfmsg = NLMSG_DATA(nlh);
469
470         nlh->nlmsg_flags    = flags;
471         nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
472         nfmsg->version  = NFNETLINK_V0;
473         nfmsg->res_id   = 0;
474
475         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
476         if (!nest_parms)
477                 goto nla_put_failure;
478         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
479                 goto nla_put_failure;
480         nla_nest_end(skb, nest_parms);
481
482         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
483         if (!nest_parms)
484                 goto nla_put_failure;
485         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
486                 goto nla_put_failure;
487         nla_nest_end(skb, nest_parms);
488
489         if (events & IPCT_DESTROY) {
490                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
491                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
492                         goto nla_put_failure;
493         } else {
494                 if (ctnetlink_dump_status(skb, ct) < 0)
495                         goto nla_put_failure;
496
497                 if (ctnetlink_dump_timeout(skb, ct) < 0)
498                         goto nla_put_failure;
499
500                 if (events & IPCT_PROTOINFO
501                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
502                         goto nla_put_failure;
503
504                 if ((events & IPCT_HELPER || nfct_help(ct))
505                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
506                         goto nla_put_failure;
507
508 #ifdef CONFIG_NF_CONNTRACK_MARK
509                 if ((events & IPCT_MARK || ct->mark)
510                     && ctnetlink_dump_mark(skb, ct) < 0)
511                         goto nla_put_failure;
512 #endif
513 #ifdef CONFIG_NF_CONNTRACK_SECMARK
514                 if ((events & IPCT_SECMARK || ct->secmark)
515                     && ctnetlink_dump_secmark(skb, ct) < 0)
516                         goto nla_put_failure;
517 #endif
518
519                 if (events & IPCT_COUNTER_FILLING &&
520                     (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
521                      ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
522                         goto nla_put_failure;
523
524                 if (events & IPCT_RELATED &&
525                     ctnetlink_dump_master(skb, ct) < 0)
526                         goto nla_put_failure;
527
528                 if (events & IPCT_NATSEQADJ &&
529                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
530                         goto nla_put_failure;
531         }
532
533         nlh->nlmsg_len = skb->tail - b;
534         nfnetlink_send(skb, 0, group, 0);
535         return NOTIFY_DONE;
536
537 nlmsg_failure:
538 nla_put_failure:
539         kfree_skb(skb);
540         return NOTIFY_DONE;
541 }
542 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
543
544 static int ctnetlink_done(struct netlink_callback *cb)
545 {
546         if (cb->args[1])
547                 nf_ct_put((struct nf_conn *)cb->args[1]);
548         return 0;
549 }
550
551 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
552
553 static int
554 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
555 {
556         struct nf_conn *ct, *last;
557         struct nf_conntrack_tuple_hash *h;
558         struct hlist_node *n;
559         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
560         u_int8_t l3proto = nfmsg->nfgen_family;
561
562         read_lock_bh(&nf_conntrack_lock);
563         last = (struct nf_conn *)cb->args[1];
564         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
565 restart:
566                 hlist_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
567                                      hnode) {
568                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
569                                 continue;
570                         ct = nf_ct_tuplehash_to_ctrack(h);
571                         /* Dump entries of a given L3 protocol number.
572                          * If it is not specified, ie. l3proto == 0,
573                          * then dump everything. */
574                         if (l3proto && L3PROTO(ct) != l3proto)
575                                 continue;
576                         if (cb->args[1]) {
577                                 if (ct != last)
578                                         continue;
579                                 cb->args[1] = 0;
580                         }
581                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
582                                                 cb->nlh->nlmsg_seq,
583                                                 IPCTNL_MSG_CT_NEW,
584                                                 1, ct) < 0) {
585                                 nf_conntrack_get(&ct->ct_general);
586                                 cb->args[1] = (unsigned long)ct;
587                                 goto out;
588                         }
589 #ifdef CONFIG_NF_CT_ACCT
590                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
591                                                 IPCTNL_MSG_CT_GET_CTRZERO)
592                                 memset(&ct->counters, 0, sizeof(ct->counters));
593 #endif
594                 }
595                 if (cb->args[1]) {
596                         cb->args[1] = 0;
597                         goto restart;
598                 }
599         }
600 out:
601         read_unlock_bh(&nf_conntrack_lock);
602         if (last)
603                 nf_ct_put(last);
604
605         return skb->len;
606 }
607
608 static inline int
609 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
610 {
611         struct nlattr *tb[CTA_IP_MAX+1];
612         struct nf_conntrack_l3proto *l3proto;
613         int ret = 0;
614
615         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
616
617         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
618
619         if (likely(l3proto->nlattr_to_tuple)) {
620                 ret = nla_validate_nested(attr, CTA_IP_MAX,
621                                           l3proto->nla_policy);
622                 if (ret == 0)
623                         ret = l3proto->nlattr_to_tuple(tb, tuple);
624         }
625
626         nf_ct_l3proto_put(l3proto);
627
628         return ret;
629 }
630
631 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
632         [CTA_PROTO_NUM] = { .type = NLA_U8 },
633 };
634
635 static inline int
636 ctnetlink_parse_tuple_proto(struct nlattr *attr,
637                             struct nf_conntrack_tuple *tuple)
638 {
639         struct nlattr *tb[CTA_PROTO_MAX+1];
640         struct nf_conntrack_l4proto *l4proto;
641         int ret = 0;
642
643         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
644         if (ret < 0)
645                 return ret;
646
647         if (!tb[CTA_PROTO_NUM])
648                 return -EINVAL;
649         tuple->dst.protonum = *(u_int8_t *)nla_data(tb[CTA_PROTO_NUM]);
650
651         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
652
653         if (likely(l4proto->nlattr_to_tuple)) {
654                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
655                                           l4proto->nla_policy);
656                 if (ret == 0)
657                         ret = l4proto->nlattr_to_tuple(tb, tuple);
658         }
659
660         nf_ct_l4proto_put(l4proto);
661
662         return ret;
663 }
664
665 static inline int
666 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
667                       enum ctattr_tuple type, u_int8_t l3num)
668 {
669         struct nlattr *tb[CTA_TUPLE_MAX+1];
670         int err;
671
672         memset(tuple, 0, sizeof(*tuple));
673
674         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
675
676         if (!tb[CTA_TUPLE_IP])
677                 return -EINVAL;
678
679         tuple->src.l3num = l3num;
680
681         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
682         if (err < 0)
683                 return err;
684
685         if (!tb[CTA_TUPLE_PROTO])
686                 return -EINVAL;
687
688         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
689         if (err < 0)
690                 return err;
691
692         /* orig and expect tuples get DIR_ORIGINAL */
693         if (type == CTA_TUPLE_REPLY)
694                 tuple->dst.dir = IP_CT_DIR_REPLY;
695         else
696                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
697
698         return 0;
699 }
700
701 #ifdef CONFIG_NF_NAT_NEEDED
702 static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
703         [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 },
704         [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 },
705 };
706
707 static int nfnetlink_parse_nat_proto(struct nlattr *attr,
708                                      const struct nf_conn *ct,
709                                      struct nf_nat_range *range)
710 {
711         struct nlattr *tb[CTA_PROTONAT_MAX+1];
712         struct nf_nat_protocol *npt;
713         int err;
714
715         err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
716         if (err < 0)
717                 return err;
718
719         npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
720
721         if (!npt->nlattr_to_range) {
722                 nf_nat_proto_put(npt);
723                 return 0;
724         }
725
726         /* nlattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
727         if (npt->nlattr_to_range(tb, range) > 0)
728                 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
729
730         nf_nat_proto_put(npt);
731
732         return 0;
733 }
734
735 static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
736         [CTA_NAT_MINIP]         = { .type = NLA_U32 },
737         [CTA_NAT_MAXIP]         = { .type = NLA_U32 },
738 };
739
740 static inline int
741 nfnetlink_parse_nat(struct nlattr *nat,
742                     const struct nf_conn *ct, struct nf_nat_range *range)
743 {
744         struct nlattr *tb[CTA_NAT_MAX+1];
745         int err;
746
747         memset(range, 0, sizeof(*range));
748
749         err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
750         if (err < 0)
751                 return err;
752
753         if (tb[CTA_NAT_MINIP])
754                 range->min_ip = *(__be32 *)nla_data(tb[CTA_NAT_MINIP]);
755
756         if (!tb[CTA_NAT_MAXIP])
757                 range->max_ip = range->min_ip;
758         else
759                 range->max_ip = *(__be32 *)nla_data(tb[CTA_NAT_MAXIP]);
760
761         if (range->min_ip)
762                 range->flags |= IP_NAT_RANGE_MAP_IPS;
763
764         if (!tb[CTA_NAT_PROTO])
765                 return 0;
766
767         err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
768         if (err < 0)
769                 return err;
770
771         return 0;
772 }
773 #endif
774
775 static inline int
776 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
777 {
778         struct nlattr *tb[CTA_HELP_MAX+1];
779
780         nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
781
782         if (!tb[CTA_HELP_NAME])
783                 return -EINVAL;
784
785         *helper_name = nla_data(tb[CTA_HELP_NAME]);
786
787         return 0;
788 }
789
790 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
791         [CTA_STATUS]            = { .type = NLA_U32 },
792         [CTA_TIMEOUT]           = { .type = NLA_U32 },
793         [CTA_MARK]              = { .type = NLA_U32 },
794         [CTA_USE]               = { .type = NLA_U32 },
795         [CTA_ID]                = { .type = NLA_U32 },
796 };
797
798 static int
799 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
800                         struct nlmsghdr *nlh, struct nlattr *cda[])
801 {
802         struct nf_conntrack_tuple_hash *h;
803         struct nf_conntrack_tuple tuple;
804         struct nf_conn *ct;
805         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
806         u_int8_t u3 = nfmsg->nfgen_family;
807         int err = 0;
808
809         if (cda[CTA_TUPLE_ORIG])
810                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
811         else if (cda[CTA_TUPLE_REPLY])
812                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
813         else {
814                 /* Flush the whole table */
815                 nf_conntrack_flush();
816                 return 0;
817         }
818
819         if (err < 0)
820                 return err;
821
822         h = nf_conntrack_find_get(&tuple);
823         if (!h)
824                 return -ENOENT;
825
826         ct = nf_ct_tuplehash_to_ctrack(h);
827
828         if (cda[CTA_ID]) {
829                 u_int32_t id = ntohl(*(__be32 *)nla_data(cda[CTA_ID]));
830                 if (id != (u32)(unsigned long)ct) {
831                         nf_ct_put(ct);
832                         return -ENOENT;
833                 }
834         }
835         if (del_timer(&ct->timeout))
836                 ct->timeout.function((unsigned long)ct);
837
838         nf_ct_put(ct);
839
840         return 0;
841 }
842
843 static int
844 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
845                         struct nlmsghdr *nlh, struct nlattr *cda[])
846 {
847         struct nf_conntrack_tuple_hash *h;
848         struct nf_conntrack_tuple tuple;
849         struct nf_conn *ct;
850         struct sk_buff *skb2 = NULL;
851         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
852         u_int8_t u3 = nfmsg->nfgen_family;
853         int err = 0;
854
855         if (nlh->nlmsg_flags & NLM_F_DUMP) {
856 #ifndef CONFIG_NF_CT_ACCT
857                 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
858                         return -ENOTSUPP;
859 #endif
860                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
861                                           ctnetlink_done);
862         }
863
864         if (cda[CTA_TUPLE_ORIG])
865                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
866         else if (cda[CTA_TUPLE_REPLY])
867                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
868         else
869                 return -EINVAL;
870
871         if (err < 0)
872                 return err;
873
874         h = nf_conntrack_find_get(&tuple);
875         if (!h)
876                 return -ENOENT;
877
878         ct = nf_ct_tuplehash_to_ctrack(h);
879
880         err = -ENOMEM;
881         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
882         if (!skb2) {
883                 nf_ct_put(ct);
884                 return -ENOMEM;
885         }
886
887         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
888                                   IPCTNL_MSG_CT_NEW, 1, ct);
889         nf_ct_put(ct);
890         if (err <= 0)
891                 goto free;
892
893         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
894         if (err < 0)
895                 goto out;
896
897         return 0;
898
899 free:
900         kfree_skb(skb2);
901 out:
902         return err;
903 }
904
905 static inline int
906 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
907 {
908         unsigned long d;
909         unsigned int status = ntohl(*(__be32 *)nla_data(cda[CTA_STATUS]));
910         d = ct->status ^ status;
911
912         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
913                 /* unchangeable */
914                 return -EINVAL;
915
916         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
917                 /* SEEN_REPLY bit can only be set */
918                 return -EINVAL;
919
920
921         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
922                 /* ASSURED bit can only be set */
923                 return -EINVAL;
924
925         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
926 #ifndef CONFIG_NF_NAT_NEEDED
927                 return -EINVAL;
928 #else
929                 struct nf_nat_range range;
930
931                 if (cda[CTA_NAT_DST]) {
932                         if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
933                                                 &range) < 0)
934                                 return -EINVAL;
935                         if (nf_nat_initialized(ct,
936                                                HOOK2MANIP(NF_INET_PRE_ROUTING)))
937                                 return -EEXIST;
938                         nf_nat_setup_info(ct, &range, NF_INET_PRE_ROUTING);
939                 }
940                 if (cda[CTA_NAT_SRC]) {
941                         if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
942                                                 &range) < 0)
943                                 return -EINVAL;
944                         if (nf_nat_initialized(ct,
945                                                HOOK2MANIP(NF_INET_POST_ROUTING)))
946                                 return -EEXIST;
947                         nf_nat_setup_info(ct, &range, NF_INET_POST_ROUTING);
948                 }
949 #endif
950         }
951
952         /* Be careful here, modifying NAT bits can screw up things,
953          * so don't let users modify them directly if they don't pass
954          * nf_nat_range. */
955         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
956         return 0;
957 }
958
959
960 static inline int
961 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
962 {
963         struct nf_conntrack_helper *helper;
964         struct nf_conn_help *help = nfct_help(ct);
965         char *helpname;
966         int err;
967
968         /* don't change helper of sibling connections */
969         if (ct->master)
970                 return -EINVAL;
971
972         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
973         if (err < 0)
974                 return err;
975
976         if (!strcmp(helpname, "")) {
977                 if (help && help->helper) {
978                         /* we had a helper before ... */
979                         nf_ct_remove_expectations(ct);
980                         rcu_assign_pointer(help->helper, NULL);
981                 }
982
983                 return 0;
984         }
985
986         helper = __nf_conntrack_helper_find_byname(helpname);
987         if (helper == NULL)
988                 return -EINVAL;
989
990         if (help) {
991                 if (help->helper == helper)
992                         return 0;
993                 if (help->helper)
994                         return -EBUSY;
995                 /* need to zero data of old helper */
996                 memset(&help->help, 0, sizeof(help->help));
997         } else {
998                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
999                 if (help == NULL)
1000                         return -ENOMEM;
1001         }
1002
1003         rcu_assign_pointer(help->helper, helper);
1004
1005         return 0;
1006 }
1007
1008 static inline int
1009 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
1010 {
1011         u_int32_t timeout = ntohl(*(__be32 *)nla_data(cda[CTA_TIMEOUT]));
1012
1013         if (!del_timer(&ct->timeout))
1014                 return -ETIME;
1015
1016         ct->timeout.expires = jiffies + timeout * HZ;
1017         add_timer(&ct->timeout);
1018
1019         return 0;
1020 }
1021
1022 static inline int
1023 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1024 {
1025         struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1026         struct nf_conntrack_l4proto *l4proto;
1027         u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
1028         u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
1029         int err = 0;
1030
1031         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1032
1033         l4proto = nf_ct_l4proto_find_get(l3num, npt);
1034
1035         if (l4proto->from_nlattr)
1036                 err = l4proto->from_nlattr(tb, ct);
1037         nf_ct_l4proto_put(l4proto);
1038
1039         return err;
1040 }
1041
1042 #ifdef CONFIG_NF_NAT_NEEDED
1043 static inline int
1044 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1045 {
1046         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1047
1048         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1049
1050         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1051                 return -EINVAL;
1052
1053         natseq->correction_pos =
1054                 ntohl(*(__be32 *)nla_data(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1055
1056         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1057                 return -EINVAL;
1058
1059         natseq->offset_before =
1060                 ntohl(*(__be32 *)nla_data(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1061
1062         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1063                 return -EINVAL;
1064
1065         natseq->offset_after =
1066                 ntohl(*(__be32 *)nla_data(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1067
1068         return 0;
1069 }
1070
1071 static int
1072 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1073 {
1074         int ret = 0;
1075         struct nf_conn_nat *nat = nfct_nat(ct);
1076
1077         if (!nat)
1078                 return 0;
1079
1080         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1081                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1082                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1083                 if (ret < 0)
1084                         return ret;
1085
1086                 ct->status |= IPS_SEQ_ADJUST;
1087         }
1088
1089         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1090                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1091                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1092                 if (ret < 0)
1093                         return ret;
1094
1095                 ct->status |= IPS_SEQ_ADJUST;
1096         }
1097
1098         return 0;
1099 }
1100 #endif
1101
1102 static int
1103 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1104 {
1105         int err;
1106
1107         if (cda[CTA_HELP]) {
1108                 err = ctnetlink_change_helper(ct, cda);
1109                 if (err < 0)
1110                         return err;
1111         }
1112
1113         if (cda[CTA_TIMEOUT]) {
1114                 err = ctnetlink_change_timeout(ct, cda);
1115                 if (err < 0)
1116                         return err;
1117         }
1118
1119         if (cda[CTA_STATUS]) {
1120                 err = ctnetlink_change_status(ct, cda);
1121                 if (err < 0)
1122                         return err;
1123         }
1124
1125         if (cda[CTA_PROTOINFO]) {
1126                 err = ctnetlink_change_protoinfo(ct, cda);
1127                 if (err < 0)
1128                         return err;
1129         }
1130
1131 #if defined(CONFIG_NF_CONNTRACK_MARK)
1132         if (cda[CTA_MARK])
1133                 ct->mark = ntohl(*(__be32 *)nla_data(cda[CTA_MARK]));
1134 #endif
1135
1136 #ifdef CONFIG_NF_NAT_NEEDED
1137         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1138                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1139                 if (err < 0)
1140                         return err;
1141         }
1142 #endif
1143
1144         return 0;
1145 }
1146
1147 static int
1148 ctnetlink_create_conntrack(struct nlattr *cda[],
1149                            struct nf_conntrack_tuple *otuple,
1150                            struct nf_conntrack_tuple *rtuple,
1151                            struct nf_conn *master_ct)
1152 {
1153         struct nf_conn *ct;
1154         int err = -EINVAL;
1155         struct nf_conn_help *help;
1156         struct nf_conntrack_helper *helper;
1157
1158         ct = nf_conntrack_alloc(otuple, rtuple);
1159         if (ct == NULL || IS_ERR(ct))
1160                 return -ENOMEM;
1161
1162         if (!cda[CTA_TIMEOUT])
1163                 goto err;
1164         ct->timeout.expires = ntohl(*(__be32 *)nla_data(cda[CTA_TIMEOUT]));
1165
1166         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1167         ct->status |= IPS_CONFIRMED;
1168
1169         if (cda[CTA_STATUS]) {
1170                 err = ctnetlink_change_status(ct, cda);
1171                 if (err < 0)
1172                         goto err;
1173         }
1174
1175         if (cda[CTA_PROTOINFO]) {
1176                 err = ctnetlink_change_protoinfo(ct, cda);
1177                 if (err < 0)
1178                         goto err;
1179         }
1180
1181 #if defined(CONFIG_NF_CONNTRACK_MARK)
1182         if (cda[CTA_MARK])
1183                 ct->mark = ntohl(*(__be32 *)nla_data(cda[CTA_MARK]));
1184 #endif
1185
1186         helper = nf_ct_helper_find_get(rtuple);
1187         if (helper) {
1188                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
1189                 if (help == NULL) {
1190                         nf_ct_helper_put(helper);
1191                         err = -ENOMEM;
1192                         goto err;
1193                 }
1194                 /* not in hash table yet so not strictly necessary */
1195                 rcu_assign_pointer(help->helper, helper);
1196         }
1197
1198         /* setup master conntrack: this is a confirmed expectation */
1199         if (master_ct) {
1200                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1201                 ct->master = master_ct;
1202         }
1203
1204         add_timer(&ct->timeout);
1205         nf_conntrack_hash_insert(ct);
1206
1207         if (helper)
1208                 nf_ct_helper_put(helper);
1209
1210         return 0;
1211
1212 err:
1213         nf_conntrack_free(ct);
1214         return err;
1215 }
1216
1217 static int
1218 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1219                         struct nlmsghdr *nlh, struct nlattr *cda[])
1220 {
1221         struct nf_conntrack_tuple otuple, rtuple;
1222         struct nf_conntrack_tuple_hash *h = NULL;
1223         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1224         u_int8_t u3 = nfmsg->nfgen_family;
1225         int err = 0;
1226
1227         if (cda[CTA_TUPLE_ORIG]) {
1228                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1229                 if (err < 0)
1230                         return err;
1231         }
1232
1233         if (cda[CTA_TUPLE_REPLY]) {
1234                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1235                 if (err < 0)
1236                         return err;
1237         }
1238
1239         write_lock_bh(&nf_conntrack_lock);
1240         if (cda[CTA_TUPLE_ORIG])
1241                 h = __nf_conntrack_find(&otuple, NULL);
1242         else if (cda[CTA_TUPLE_REPLY])
1243                 h = __nf_conntrack_find(&rtuple, NULL);
1244
1245         if (h == NULL) {
1246                 struct nf_conntrack_tuple master;
1247                 struct nf_conntrack_tuple_hash *master_h = NULL;
1248                 struct nf_conn *master_ct = NULL;
1249
1250                 if (cda[CTA_TUPLE_MASTER]) {
1251                         err = ctnetlink_parse_tuple(cda,
1252                                                     &master,
1253                                                     CTA_TUPLE_MASTER,
1254                                                     u3);
1255                         if (err < 0)
1256                                 return err;
1257
1258                         master_h = __nf_conntrack_find(&master, NULL);
1259                         if (master_h == NULL) {
1260                                 err = -ENOENT;
1261                                 goto out_unlock;
1262                         }
1263                         master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1264                         atomic_inc(&master_ct->ct_general.use);
1265                 }
1266
1267                 write_unlock_bh(&nf_conntrack_lock);
1268                 err = -ENOENT;
1269                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1270                         err = ctnetlink_create_conntrack(cda,
1271                                                          &otuple,
1272                                                          &rtuple,
1273                                                          master_ct);
1274                 if (err < 0 && master_ct)
1275                         nf_ct_put(master_ct);
1276
1277                 return err;
1278         }
1279         /* implicit 'else' */
1280
1281         /* We manipulate the conntrack inside the global conntrack table lock,
1282          * so there's no need to increase the refcount */
1283         err = -EEXIST;
1284         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1285                 /* we only allow nat config for new conntracks */
1286                 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1287                         err = -EINVAL;
1288                         goto out_unlock;
1289                 }
1290                 /* can't link an existing conntrack to a master */
1291                 if (cda[CTA_TUPLE_MASTER]) {
1292                         err = -EINVAL;
1293                         goto out_unlock;
1294                 }
1295                 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1296                                                  cda);
1297         }
1298
1299 out_unlock:
1300         write_unlock_bh(&nf_conntrack_lock);
1301         return err;
1302 }
1303
1304 /***********************************************************************
1305  * EXPECT
1306  ***********************************************************************/
1307
1308 static inline int
1309 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1310                          const struct nf_conntrack_tuple *tuple,
1311                          enum ctattr_expect type)
1312 {
1313         struct nlattr *nest_parms;
1314
1315         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1316         if (!nest_parms)
1317                 goto nla_put_failure;
1318         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1319                 goto nla_put_failure;
1320         nla_nest_end(skb, nest_parms);
1321
1322         return 0;
1323
1324 nla_put_failure:
1325         return -1;
1326 }
1327
1328 static inline int
1329 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1330                         const struct nf_conntrack_tuple *tuple,
1331                         const struct nf_conntrack_tuple_mask *mask)
1332 {
1333         int ret;
1334         struct nf_conntrack_l3proto *l3proto;
1335         struct nf_conntrack_l4proto *l4proto;
1336         struct nf_conntrack_tuple m;
1337         struct nlattr *nest_parms;
1338
1339         memset(&m, 0xFF, sizeof(m));
1340         m.src.u.all = mask->src.u.all;
1341         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1342
1343         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1344         if (!nest_parms)
1345                 goto nla_put_failure;
1346
1347         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1348         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1349         nf_ct_l3proto_put(l3proto);
1350
1351         if (unlikely(ret < 0))
1352                 goto nla_put_failure;
1353
1354         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1355         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1356         nf_ct_l4proto_put(l4proto);
1357         if (unlikely(ret < 0))
1358                 goto nla_put_failure;
1359
1360         nla_nest_end(skb, nest_parms);
1361
1362         return 0;
1363
1364 nla_put_failure:
1365         return -1;
1366 }
1367
1368 static inline int
1369 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1370                           const struct nf_conntrack_expect *exp)
1371 {
1372         struct nf_conn *master = exp->master;
1373         __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1374         __be32 id = htonl((unsigned long)exp);
1375
1376         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1377                 goto nla_put_failure;
1378         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1379                 goto nla_put_failure;
1380         if (ctnetlink_exp_dump_tuple(skb,
1381                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1382                                  CTA_EXPECT_MASTER) < 0)
1383                 goto nla_put_failure;
1384
1385         NLA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1386         NLA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1387
1388         return 0;
1389
1390 nla_put_failure:
1391         return -1;
1392 }
1393
1394 static int
1395 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1396                     int event,
1397                     int nowait,
1398                     const struct nf_conntrack_expect *exp)
1399 {
1400         struct nlmsghdr *nlh;
1401         struct nfgenmsg *nfmsg;
1402         unsigned char *b = skb_tail_pointer(skb);
1403
1404         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1405         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1406         nfmsg  = NLMSG_DATA(nlh);
1407
1408         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1409         nfmsg->nfgen_family = exp->tuple.src.l3num;
1410         nfmsg->version      = NFNETLINK_V0;
1411         nfmsg->res_id       = 0;
1412
1413         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1414                 goto nla_put_failure;
1415
1416         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1417         return skb->len;
1418
1419 nlmsg_failure:
1420 nla_put_failure:
1421         nlmsg_trim(skb, b);
1422         return -1;
1423 }
1424
1425 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1426 static int ctnetlink_expect_event(struct notifier_block *this,
1427                                   unsigned long events, void *ptr)
1428 {
1429         struct nlmsghdr *nlh;
1430         struct nfgenmsg *nfmsg;
1431         struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1432         struct sk_buff *skb;
1433         unsigned int type;
1434         sk_buff_data_t b;
1435         int flags = 0;
1436
1437         if (events & IPEXP_NEW) {
1438                 type = IPCTNL_MSG_EXP_NEW;
1439                 flags = NLM_F_CREATE|NLM_F_EXCL;
1440         } else
1441                 return NOTIFY_DONE;
1442
1443         if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1444                 return NOTIFY_DONE;
1445
1446         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1447         if (!skb)
1448                 return NOTIFY_DONE;
1449
1450         b = skb->tail;
1451
1452         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1453         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1454         nfmsg = NLMSG_DATA(nlh);
1455
1456         nlh->nlmsg_flags    = flags;
1457         nfmsg->nfgen_family = exp->tuple.src.l3num;
1458         nfmsg->version      = NFNETLINK_V0;
1459         nfmsg->res_id       = 0;
1460
1461         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1462                 goto nla_put_failure;
1463
1464         nlh->nlmsg_len = skb->tail - b;
1465         nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1466         return NOTIFY_DONE;
1467
1468 nlmsg_failure:
1469 nla_put_failure:
1470         kfree_skb(skb);
1471         return NOTIFY_DONE;
1472 }
1473 #endif
1474 static int ctnetlink_exp_done(struct netlink_callback *cb)
1475 {
1476         if (cb->args[1])
1477                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1478         return 0;
1479 }
1480
1481 static int
1482 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1483 {
1484         struct nf_conntrack_expect *exp, *last;
1485         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1486         struct hlist_node *n;
1487         u_int8_t l3proto = nfmsg->nfgen_family;
1488
1489         read_lock_bh(&nf_conntrack_lock);
1490         last = (struct nf_conntrack_expect *)cb->args[1];
1491         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1492 restart:
1493                 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1494                                      hnode) {
1495                         if (l3proto && exp->tuple.src.l3num != l3proto)
1496                                 continue;
1497                         if (cb->args[1]) {
1498                                 if (exp != last)
1499                                         continue;
1500                                 cb->args[1] = 0;
1501                         }
1502                         if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1503                                                     cb->nlh->nlmsg_seq,
1504                                                     IPCTNL_MSG_EXP_NEW,
1505                                                     1, exp) < 0) {
1506                                 atomic_inc(&exp->use);
1507                                 cb->args[1] = (unsigned long)exp;
1508                                 goto out;
1509                         }
1510                 }
1511                 if (cb->args[1]) {
1512                         cb->args[1] = 0;
1513                         goto restart;
1514                 }
1515         }
1516 out:
1517         read_unlock_bh(&nf_conntrack_lock);
1518         if (last)
1519                 nf_ct_expect_put(last);
1520
1521         return skb->len;
1522 }
1523
1524 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1525         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1526         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1527 };
1528
1529 static int
1530 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1531                      struct nlmsghdr *nlh, struct nlattr *cda[])
1532 {
1533         struct nf_conntrack_tuple tuple;
1534         struct nf_conntrack_expect *exp;
1535         struct sk_buff *skb2;
1536         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1537         u_int8_t u3 = nfmsg->nfgen_family;
1538         int err = 0;
1539
1540         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1541                 return netlink_dump_start(ctnl, skb, nlh,
1542                                           ctnetlink_exp_dump_table,
1543                                           ctnetlink_exp_done);
1544         }
1545
1546         if (cda[CTA_EXPECT_MASTER])
1547                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1548         else
1549                 return -EINVAL;
1550
1551         if (err < 0)
1552                 return err;
1553
1554         exp = nf_ct_expect_find_get(&tuple);
1555         if (!exp)
1556                 return -ENOENT;
1557
1558         if (cda[CTA_EXPECT_ID]) {
1559                 __be32 id = *(__be32 *)nla_data(cda[CTA_EXPECT_ID]);
1560                 if (ntohl(id) != (u32)(unsigned long)exp) {
1561                         nf_ct_expect_put(exp);
1562                         return -ENOENT;
1563                 }
1564         }
1565
1566         err = -ENOMEM;
1567         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1568         if (!skb2)
1569                 goto out;
1570
1571         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1572                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1573                                       1, exp);
1574         if (err <= 0)
1575                 goto free;
1576
1577         nf_ct_expect_put(exp);
1578
1579         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1580
1581 free:
1582         kfree_skb(skb2);
1583 out:
1584         nf_ct_expect_put(exp);
1585         return err;
1586 }
1587
1588 static int
1589 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1590                      struct nlmsghdr *nlh, struct nlattr *cda[])
1591 {
1592         struct nf_conntrack_expect *exp;
1593         struct nf_conntrack_tuple tuple;
1594         struct nf_conntrack_helper *h;
1595         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1596         struct hlist_node *n, *next;
1597         u_int8_t u3 = nfmsg->nfgen_family;
1598         unsigned int i;
1599         int err;
1600
1601         if (cda[CTA_EXPECT_TUPLE]) {
1602                 /* delete a single expect by tuple */
1603                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1604                 if (err < 0)
1605                         return err;
1606
1607                 /* bump usage count to 2 */
1608                 exp = nf_ct_expect_find_get(&tuple);
1609                 if (!exp)
1610                         return -ENOENT;
1611
1612                 if (cda[CTA_EXPECT_ID]) {
1613                         __be32 id = *(__be32 *)nla_data(cda[CTA_EXPECT_ID]);
1614                         if (ntohl(id) != (u32)(unsigned long)exp) {
1615                                 nf_ct_expect_put(exp);
1616                                 return -ENOENT;
1617                         }
1618                 }
1619
1620                 /* after list removal, usage count == 1 */
1621                 nf_ct_unexpect_related(exp);
1622                 /* have to put what we 'get' above.
1623                  * after this line usage count == 0 */
1624                 nf_ct_expect_put(exp);
1625         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1626                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1627                 struct nf_conn_help *m_help;
1628
1629                 /* delete all expectations for this helper */
1630                 write_lock_bh(&nf_conntrack_lock);
1631                 h = __nf_conntrack_helper_find_byname(name);
1632                 if (!h) {
1633                         write_unlock_bh(&nf_conntrack_lock);
1634                         return -EINVAL;
1635                 }
1636                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1637                         hlist_for_each_entry_safe(exp, n, next,
1638                                                   &nf_ct_expect_hash[i],
1639                                                   hnode) {
1640                                 m_help = nfct_help(exp->master);
1641                                 if (m_help->helper == h
1642                                     && del_timer(&exp->timeout)) {
1643                                         nf_ct_unlink_expect(exp);
1644                                         nf_ct_expect_put(exp);
1645                                 }
1646                         }
1647                 }
1648                 write_unlock_bh(&nf_conntrack_lock);
1649         } else {
1650                 /* This basically means we have to flush everything*/
1651                 write_lock_bh(&nf_conntrack_lock);
1652                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1653                         hlist_for_each_entry_safe(exp, n, next,
1654                                                   &nf_ct_expect_hash[i],
1655                                                   hnode) {
1656                                 if (del_timer(&exp->timeout)) {
1657                                         nf_ct_unlink_expect(exp);
1658                                         nf_ct_expect_put(exp);
1659                                 }
1660                         }
1661                 }
1662                 write_unlock_bh(&nf_conntrack_lock);
1663         }
1664
1665         return 0;
1666 }
1667 static int
1668 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1669 {
1670         return -EOPNOTSUPP;
1671 }
1672
1673 static int
1674 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1675 {
1676         struct nf_conntrack_tuple tuple, mask, master_tuple;
1677         struct nf_conntrack_tuple_hash *h = NULL;
1678         struct nf_conntrack_expect *exp;
1679         struct nf_conn *ct;
1680         struct nf_conn_help *help;
1681         int err = 0;
1682
1683         /* caller guarantees that those three CTA_EXPECT_* exist */
1684         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1685         if (err < 0)
1686                 return err;
1687         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1688         if (err < 0)
1689                 return err;
1690         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1691         if (err < 0)
1692                 return err;
1693
1694         /* Look for master conntrack of this expectation */
1695         h = nf_conntrack_find_get(&master_tuple);
1696         if (!h)
1697                 return -ENOENT;
1698         ct = nf_ct_tuplehash_to_ctrack(h);
1699         help = nfct_help(ct);
1700
1701         if (!help || !help->helper) {
1702                 /* such conntrack hasn't got any helper, abort */
1703                 err = -EINVAL;
1704                 goto out;
1705         }
1706
1707         exp = nf_ct_expect_alloc(ct);
1708         if (!exp) {
1709                 err = -ENOMEM;
1710                 goto out;
1711         }
1712
1713         exp->expectfn = NULL;
1714         exp->flags = 0;
1715         exp->master = ct;
1716         exp->helper = NULL;
1717         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1718         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1719         exp->mask.src.u.all = mask.src.u.all;
1720
1721         err = nf_ct_expect_related(exp);
1722         nf_ct_expect_put(exp);
1723
1724 out:
1725         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1726         return err;
1727 }
1728
1729 static int
1730 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1731                      struct nlmsghdr *nlh, struct nlattr *cda[])
1732 {
1733         struct nf_conntrack_tuple tuple;
1734         struct nf_conntrack_expect *exp;
1735         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1736         u_int8_t u3 = nfmsg->nfgen_family;
1737         int err = 0;
1738
1739         if (!cda[CTA_EXPECT_TUPLE]
1740             || !cda[CTA_EXPECT_MASK]
1741             || !cda[CTA_EXPECT_MASTER])
1742                 return -EINVAL;
1743
1744         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1745         if (err < 0)
1746                 return err;
1747
1748         write_lock_bh(&nf_conntrack_lock);
1749         exp = __nf_ct_expect_find(&tuple);
1750
1751         if (!exp) {
1752                 write_unlock_bh(&nf_conntrack_lock);
1753                 err = -ENOENT;
1754                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1755                         err = ctnetlink_create_expect(cda, u3);
1756                 return err;
1757         }
1758
1759         err = -EEXIST;
1760         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1761                 err = ctnetlink_change_expect(exp, cda);
1762         write_unlock_bh(&nf_conntrack_lock);
1763
1764         return err;
1765 }
1766
1767 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1768 static struct notifier_block ctnl_notifier = {
1769         .notifier_call  = ctnetlink_conntrack_event,
1770 };
1771
1772 static struct notifier_block ctnl_notifier_exp = {
1773         .notifier_call  = ctnetlink_expect_event,
1774 };
1775 #endif
1776
1777 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1778         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1779                                             .attr_count = CTA_MAX,
1780                                             .policy = ct_nla_policy },
1781         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1782                                             .attr_count = CTA_MAX,
1783                                             .policy = ct_nla_policy },
1784         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1785                                             .attr_count = CTA_MAX,
1786                                             .policy = ct_nla_policy },
1787         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1788                                             .attr_count = CTA_MAX,
1789                                             .policy = ct_nla_policy },
1790 };
1791
1792 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1793         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1794                                             .attr_count = CTA_EXPECT_MAX,
1795                                             .policy = exp_nla_policy },
1796         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1797                                             .attr_count = CTA_EXPECT_MAX,
1798                                             .policy = exp_nla_policy },
1799         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1800                                             .attr_count = CTA_EXPECT_MAX,
1801                                             .policy = exp_nla_policy },
1802 };
1803
1804 static const struct nfnetlink_subsystem ctnl_subsys = {
1805         .name                           = "conntrack",
1806         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1807         .cb_count                       = IPCTNL_MSG_MAX,
1808         .cb                             = ctnl_cb,
1809 };
1810
1811 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1812         .name                           = "conntrack_expect",
1813         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1814         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1815         .cb                             = ctnl_exp_cb,
1816 };
1817
1818 MODULE_ALIAS("ip_conntrack_netlink");
1819 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1820 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1821
1822 static int __init ctnetlink_init(void)
1823 {
1824         int ret;
1825
1826         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1827         ret = nfnetlink_subsys_register(&ctnl_subsys);
1828         if (ret < 0) {
1829                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1830                 goto err_out;
1831         }
1832
1833         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1834         if (ret < 0) {
1835                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1836                 goto err_unreg_subsys;
1837         }
1838
1839 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1840         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1841         if (ret < 0) {
1842                 printk("ctnetlink_init: cannot register notifier.\n");
1843                 goto err_unreg_exp_subsys;
1844         }
1845
1846         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1847         if (ret < 0) {
1848                 printk("ctnetlink_init: cannot expect register notifier.\n");
1849                 goto err_unreg_notifier;
1850         }
1851 #endif
1852
1853         return 0;
1854
1855 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1856 err_unreg_notifier:
1857         nf_conntrack_unregister_notifier(&ctnl_notifier);
1858 err_unreg_exp_subsys:
1859         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1860 #endif
1861 err_unreg_subsys:
1862         nfnetlink_subsys_unregister(&ctnl_subsys);
1863 err_out:
1864         return ret;
1865 }
1866
1867 static void __exit ctnetlink_exit(void)
1868 {
1869         printk("ctnetlink: unregistering from nfnetlink.\n");
1870
1871 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1872         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1873         nf_conntrack_unregister_notifier(&ctnl_notifier);
1874 #endif
1875
1876         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1877         nfnetlink_subsys_unregister(&ctnl_subsys);
1878         return;
1879 }
1880
1881 module_init(ctnetlink_init);
1882 module_exit(ctnetlink_exit);