Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6
[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) 2005-2008 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 #include <linux/notifier.h>
31
32 #include <linux/netfilter.h>
33 #include <net/netlink.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, const 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 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
350
351 static int
352 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
353                     int event, int nowait,
354                     const struct nf_conn *ct)
355 {
356         struct nlmsghdr *nlh;
357         struct nfgenmsg *nfmsg;
358         struct nlattr *nest_parms;
359         unsigned char *b = skb_tail_pointer(skb);
360
361         event |= NFNL_SUBSYS_CTNETLINK << 8;
362         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
363         nfmsg  = NLMSG_DATA(nlh);
364
365         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
366         nfmsg->nfgen_family = nf_ct_l3num(ct);
367         nfmsg->version      = NFNETLINK_V0;
368         nfmsg->res_id       = 0;
369
370         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
371         if (!nest_parms)
372                 goto nla_put_failure;
373         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
374                 goto nla_put_failure;
375         nla_nest_end(skb, nest_parms);
376
377         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
378         if (!nest_parms)
379                 goto nla_put_failure;
380         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
381                 goto nla_put_failure;
382         nla_nest_end(skb, nest_parms);
383
384         if (ctnetlink_dump_status(skb, ct) < 0 ||
385             ctnetlink_dump_timeout(skb, ct) < 0 ||
386             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
387             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
388             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
389             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
390             ctnetlink_dump_mark(skb, ct) < 0 ||
391             ctnetlink_dump_secmark(skb, ct) < 0 ||
392             ctnetlink_dump_id(skb, ct) < 0 ||
393             ctnetlink_dump_use(skb, ct) < 0 ||
394             ctnetlink_dump_master(skb, ct) < 0 ||
395             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
396                 goto nla_put_failure;
397
398         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
399         return skb->len;
400
401 nlmsg_failure:
402 nla_put_failure:
403         nlmsg_trim(skb, b);
404         return -1;
405 }
406
407 #ifdef CONFIG_NF_CONNTRACK_EVENTS
408 /*
409  * The general structure of a ctnetlink event is
410  *
411  *  CTA_TUPLE_ORIG
412  *    <l3/l4-proto-attributes>
413  *  CTA_TUPLE_REPLY
414  *    <l3/l4-proto-attributes>
415  *  CTA_ID
416  *  ...
417  *  CTA_PROTOINFO
418  *    <l4-proto-attributes>
419  *  CTA_TUPLE_MASTER
420  *    <l3/l4-proto-attributes>
421  *
422  * Therefore the formular is
423  *
424  *   size = sizeof(headers) + sizeof(generic_nlas) + 3 * sizeof(tuple_nlas)
425  *              + sizeof(protoinfo_nlas)
426  */
427 static struct sk_buff *
428 ctnetlink_alloc_skb(const struct nf_conntrack_tuple *tuple, gfp_t gfp)
429 {
430         struct nf_conntrack_l3proto *l3proto;
431         struct nf_conntrack_l4proto *l4proto;
432         int len;
433
434 #define NLA_TYPE_SIZE(type)             nla_total_size(sizeof(type))
435
436         /* proto independant part */
437         len = NLMSG_SPACE(sizeof(struct nfgenmsg))
438                 + 3 * nla_total_size(0)         /* CTA_TUPLE_ORIG|REPL|MASTER */
439                 + 3 * nla_total_size(0)         /* CTA_TUPLE_IP */
440                 + 3 * nla_total_size(0)         /* CTA_TUPLE_PROTO */
441                 + 3 * NLA_TYPE_SIZE(u_int8_t)   /* CTA_PROTO_NUM */
442                 + NLA_TYPE_SIZE(u_int32_t)      /* CTA_ID */
443                 + NLA_TYPE_SIZE(u_int32_t)      /* CTA_STATUS */
444 #ifdef CONFIG_NF_CT_ACCT
445                 + 2 * nla_total_size(0)         /* CTA_COUNTERS_ORIG|REPL */
446                 + 2 * NLA_TYPE_SIZE(uint64_t)   /* CTA_COUNTERS_PACKETS */
447                 + 2 * NLA_TYPE_SIZE(uint64_t)   /* CTA_COUNTERS_BYTES */
448 #endif
449                 + NLA_TYPE_SIZE(u_int32_t)      /* CTA_TIMEOUT */
450                 + nla_total_size(0)             /* CTA_PROTOINFO */
451                 + nla_total_size(0)             /* CTA_HELP */
452                 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
453 #ifdef CONFIG_NF_CONNTRACK_SECMARK
454                 + NLA_TYPE_SIZE(u_int32_t)      /* CTA_SECMARK */
455 #endif
456 #ifdef CONFIG_NF_NAT_NEEDED
457                 + 2 * nla_total_size(0)         /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
458                 + 2 * NLA_TYPE_SIZE(u_int32_t)  /* CTA_NAT_SEQ_CORRECTION_POS */
459                 + 2 * NLA_TYPE_SIZE(u_int32_t)  /* CTA_NAT_SEQ_CORRECTION_BEFORE */
460                 + 2 * NLA_TYPE_SIZE(u_int32_t)  /* CTA_NAT_SEQ_CORRECTION_AFTER */
461 #endif
462 #ifdef CONFIG_NF_CONNTRACK_MARK
463                 + NLA_TYPE_SIZE(u_int32_t)      /* CTA_MARK */
464 #endif
465                 ;
466
467 #undef NLA_TYPE_SIZE
468
469         rcu_read_lock();
470         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
471         len += l3proto->nla_size;
472
473         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
474         len += l4proto->nla_size;
475         rcu_read_unlock();
476
477         return alloc_skb(len, gfp);
478 }
479
480 static int ctnetlink_conntrack_event(struct notifier_block *this,
481                                      unsigned long events, void *ptr)
482 {
483         struct nlmsghdr *nlh;
484         struct nfgenmsg *nfmsg;
485         struct nlattr *nest_parms;
486         struct nf_ct_event *item = (struct nf_ct_event *)ptr;
487         struct nf_conn *ct = item->ct;
488         struct sk_buff *skb;
489         unsigned int type;
490         sk_buff_data_t b;
491         unsigned int flags = 0, group;
492
493         /* ignore our fake conntrack entry */
494         if (ct == &nf_conntrack_untracked)
495                 return NOTIFY_DONE;
496
497         if (events & IPCT_DESTROY) {
498                 type = IPCTNL_MSG_CT_DELETE;
499                 group = NFNLGRP_CONNTRACK_DESTROY;
500         } else  if (events & (IPCT_NEW | IPCT_RELATED)) {
501                 type = IPCTNL_MSG_CT_NEW;
502                 flags = NLM_F_CREATE|NLM_F_EXCL;
503                 group = NFNLGRP_CONNTRACK_NEW;
504         } else  if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
505                 type = IPCTNL_MSG_CT_NEW;
506                 group = NFNLGRP_CONNTRACK_UPDATE;
507         } else
508                 return NOTIFY_DONE;
509
510         if (!item->report && !nfnetlink_has_listeners(group))
511                 return NOTIFY_DONE;
512
513         skb = ctnetlink_alloc_skb(tuple(ct, IP_CT_DIR_ORIGINAL), GFP_ATOMIC);
514         if (!skb)
515                 return NOTIFY_DONE;
516
517         b = skb->tail;
518
519         type |= NFNL_SUBSYS_CTNETLINK << 8;
520         nlh   = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
521         nfmsg = NLMSG_DATA(nlh);
522
523         nlh->nlmsg_flags    = flags;
524         nfmsg->nfgen_family = nf_ct_l3num(ct);
525         nfmsg->version  = NFNETLINK_V0;
526         nfmsg->res_id   = 0;
527
528         rcu_read_lock();
529         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
530         if (!nest_parms)
531                 goto nla_put_failure;
532         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
533                 goto nla_put_failure;
534         nla_nest_end(skb, nest_parms);
535
536         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
537         if (!nest_parms)
538                 goto nla_put_failure;
539         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
540                 goto nla_put_failure;
541         nla_nest_end(skb, nest_parms);
542
543         if (ctnetlink_dump_id(skb, ct) < 0)
544                 goto nla_put_failure;
545
546         if (ctnetlink_dump_status(skb, ct) < 0)
547                 goto nla_put_failure;
548
549         if (events & IPCT_DESTROY) {
550                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
551                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
552                         goto nla_put_failure;
553         } else {
554                 if (ctnetlink_dump_timeout(skb, ct) < 0)
555                         goto nla_put_failure;
556
557                 if (events & IPCT_PROTOINFO
558                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
559                         goto nla_put_failure;
560
561                 if ((events & IPCT_HELPER || nfct_help(ct))
562                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
563                         goto nla_put_failure;
564
565 #ifdef CONFIG_NF_CONNTRACK_SECMARK
566                 if ((events & IPCT_SECMARK || ct->secmark)
567                     && ctnetlink_dump_secmark(skb, ct) < 0)
568                         goto nla_put_failure;
569 #endif
570
571                 if (events & IPCT_RELATED &&
572                     ctnetlink_dump_master(skb, ct) < 0)
573                         goto nla_put_failure;
574
575                 if (events & IPCT_NATSEQADJ &&
576                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
577                         goto nla_put_failure;
578         }
579
580 #ifdef CONFIG_NF_CONNTRACK_MARK
581         if ((events & IPCT_MARK || ct->mark)
582             && ctnetlink_dump_mark(skb, ct) < 0)
583                 goto nla_put_failure;
584 #endif
585         rcu_read_unlock();
586
587         nlh->nlmsg_len = skb->tail - b;
588         nfnetlink_send(skb, item->pid, group, item->report);
589         return NOTIFY_DONE;
590
591 nla_put_failure:
592         rcu_read_unlock();
593 nlmsg_failure:
594         nfnetlink_set_err(0, group, -ENOBUFS);
595         kfree_skb(skb);
596         return NOTIFY_DONE;
597 }
598 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
599
600 static int ctnetlink_done(struct netlink_callback *cb)
601 {
602         if (cb->args[1])
603                 nf_ct_put((struct nf_conn *)cb->args[1]);
604         return 0;
605 }
606
607 static int
608 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
609 {
610         struct nf_conn *ct, *last;
611         struct nf_conntrack_tuple_hash *h;
612         struct hlist_nulls_node *n;
613         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
614         u_int8_t l3proto = nfmsg->nfgen_family;
615
616         rcu_read_lock();
617         last = (struct nf_conn *)cb->args[1];
618         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
619 restart:
620                 hlist_nulls_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
621                                          hnnode) {
622                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
623                                 continue;
624                         ct = nf_ct_tuplehash_to_ctrack(h);
625                         if (!atomic_inc_not_zero(&ct->ct_general.use))
626                                 continue;
627                         /* Dump entries of a given L3 protocol number.
628                          * If it is not specified, ie. l3proto == 0,
629                          * then dump everything. */
630                         if (l3proto && nf_ct_l3num(ct) != l3proto)
631                                 goto releasect;
632                         if (cb->args[1]) {
633                                 if (ct != last)
634                                         goto releasect;
635                                 cb->args[1] = 0;
636                         }
637                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
638                                                 cb->nlh->nlmsg_seq,
639                                                 IPCTNL_MSG_CT_NEW,
640                                                 1, ct) < 0) {
641                                 cb->args[1] = (unsigned long)ct;
642                                 goto out;
643                         }
644
645                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
646                                                 IPCTNL_MSG_CT_GET_CTRZERO) {
647                                 struct nf_conn_counter *acct;
648
649                                 acct = nf_conn_acct_find(ct);
650                                 if (acct)
651                                         memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
652                         }
653 releasect:
654                 nf_ct_put(ct);
655                 }
656                 if (cb->args[1]) {
657                         cb->args[1] = 0;
658                         goto restart;
659                 }
660         }
661 out:
662         rcu_read_unlock();
663         if (last)
664                 nf_ct_put(last);
665
666         return skb->len;
667 }
668
669 static inline int
670 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
671 {
672         struct nlattr *tb[CTA_IP_MAX+1];
673         struct nf_conntrack_l3proto *l3proto;
674         int ret = 0;
675
676         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
677
678         rcu_read_lock();
679         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
680
681         if (likely(l3proto->nlattr_to_tuple)) {
682                 ret = nla_validate_nested(attr, CTA_IP_MAX,
683                                           l3proto->nla_policy);
684                 if (ret == 0)
685                         ret = l3proto->nlattr_to_tuple(tb, tuple);
686         }
687
688         rcu_read_unlock();
689
690         return ret;
691 }
692
693 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
694         [CTA_PROTO_NUM] = { .type = NLA_U8 },
695 };
696
697 static inline int
698 ctnetlink_parse_tuple_proto(struct nlattr *attr,
699                             struct nf_conntrack_tuple *tuple)
700 {
701         struct nlattr *tb[CTA_PROTO_MAX+1];
702         struct nf_conntrack_l4proto *l4proto;
703         int ret = 0;
704
705         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
706         if (ret < 0)
707                 return ret;
708
709         if (!tb[CTA_PROTO_NUM])
710                 return -EINVAL;
711         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
712
713         rcu_read_lock();
714         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
715
716         if (likely(l4proto->nlattr_to_tuple)) {
717                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
718                                           l4proto->nla_policy);
719                 if (ret == 0)
720                         ret = l4proto->nlattr_to_tuple(tb, tuple);
721         }
722
723         rcu_read_unlock();
724
725         return ret;
726 }
727
728 static int
729 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
730                       enum ctattr_tuple type, u_int8_t l3num)
731 {
732         struct nlattr *tb[CTA_TUPLE_MAX+1];
733         int err;
734
735         memset(tuple, 0, sizeof(*tuple));
736
737         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
738
739         if (!tb[CTA_TUPLE_IP])
740                 return -EINVAL;
741
742         tuple->src.l3num = l3num;
743
744         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
745         if (err < 0)
746                 return err;
747
748         if (!tb[CTA_TUPLE_PROTO])
749                 return -EINVAL;
750
751         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
752         if (err < 0)
753                 return err;
754
755         /* orig and expect tuples get DIR_ORIGINAL */
756         if (type == CTA_TUPLE_REPLY)
757                 tuple->dst.dir = IP_CT_DIR_REPLY;
758         else
759                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
760
761         return 0;
762 }
763
764 static inline int
765 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
766 {
767         struct nlattr *tb[CTA_HELP_MAX+1];
768
769         nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
770
771         if (!tb[CTA_HELP_NAME])
772                 return -EINVAL;
773
774         *helper_name = nla_data(tb[CTA_HELP_NAME]);
775
776         return 0;
777 }
778
779 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
780         [CTA_STATUS]            = { .type = NLA_U32 },
781         [CTA_TIMEOUT]           = { .type = NLA_U32 },
782         [CTA_MARK]              = { .type = NLA_U32 },
783         [CTA_USE]               = { .type = NLA_U32 },
784         [CTA_ID]                = { .type = NLA_U32 },
785 };
786
787 static int
788 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
789                         struct nlmsghdr *nlh, struct nlattr *cda[])
790 {
791         struct nf_conntrack_tuple_hash *h;
792         struct nf_conntrack_tuple tuple;
793         struct nf_conn *ct;
794         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
795         u_int8_t u3 = nfmsg->nfgen_family;
796         int err = 0;
797
798         if (cda[CTA_TUPLE_ORIG])
799                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
800         else if (cda[CTA_TUPLE_REPLY])
801                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
802         else {
803                 /* Flush the whole table */
804                 nf_conntrack_flush(&init_net, 
805                                    NETLINK_CB(skb).pid, 
806                                    nlmsg_report(nlh));
807                 return 0;
808         }
809
810         if (err < 0)
811                 return err;
812
813         h = nf_conntrack_find_get(&init_net, &tuple);
814         if (!h)
815                 return -ENOENT;
816
817         ct = nf_ct_tuplehash_to_ctrack(h);
818
819         if (cda[CTA_ID]) {
820                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
821                 if (id != (u32)(unsigned long)ct) {
822                         nf_ct_put(ct);
823                         return -ENOENT;
824                 }
825         }
826
827         nf_conntrack_event_report(IPCT_DESTROY,
828                                   ct,
829                                   NETLINK_CB(skb).pid,
830                                   nlmsg_report(nlh));
831
832         /* death_by_timeout would report the event again */
833         set_bit(IPS_DYING_BIT, &ct->status);
834
835         nf_ct_kill(ct);
836         nf_ct_put(ct);
837
838         return 0;
839 }
840
841 static int
842 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
843                         struct nlmsghdr *nlh, struct nlattr *cda[])
844 {
845         struct nf_conntrack_tuple_hash *h;
846         struct nf_conntrack_tuple tuple;
847         struct nf_conn *ct;
848         struct sk_buff *skb2 = NULL;
849         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
850         u_int8_t u3 = nfmsg->nfgen_family;
851         int err = 0;
852
853         if (nlh->nlmsg_flags & NLM_F_DUMP)
854                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
855                                           ctnetlink_done);
856
857         if (cda[CTA_TUPLE_ORIG])
858                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
859         else if (cda[CTA_TUPLE_REPLY])
860                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
861         else
862                 return -EINVAL;
863
864         if (err < 0)
865                 return err;
866
867         h = nf_conntrack_find_get(&init_net, &tuple);
868         if (!h)
869                 return -ENOENT;
870
871         ct = nf_ct_tuplehash_to_ctrack(h);
872
873         err = -ENOMEM;
874         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
875         if (!skb2) {
876                 nf_ct_put(ct);
877                 return -ENOMEM;
878         }
879
880         rcu_read_lock();
881         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
882                                   IPCTNL_MSG_CT_NEW, 1, ct);
883         rcu_read_unlock();
884         nf_ct_put(ct);
885         if (err <= 0)
886                 goto free;
887
888         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
889         if (err < 0)
890                 goto out;
891
892         return 0;
893
894 free:
895         kfree_skb(skb2);
896 out:
897         return err;
898 }
899
900 #ifdef CONFIG_NF_NAT_NEEDED
901 static int
902 ctnetlink_parse_nat_setup(struct nf_conn *ct,
903                           enum nf_nat_manip_type manip,
904                           struct nlattr *attr)
905 {
906         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
907
908         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
909         if (!parse_nat_setup) {
910 #ifdef CONFIG_MODULES
911                 rcu_read_unlock();
912                 spin_unlock_bh(&nf_conntrack_lock);
913                 nfnl_unlock();
914                 if (request_module("nf-nat-ipv4") < 0) {
915                         nfnl_lock();
916                         spin_lock_bh(&nf_conntrack_lock);
917                         rcu_read_lock();
918                         return -EOPNOTSUPP;
919                 }
920                 nfnl_lock();
921                 spin_lock_bh(&nf_conntrack_lock);
922                 rcu_read_lock();
923                 if (nfnetlink_parse_nat_setup_hook)
924                         return -EAGAIN;
925 #endif
926                 return -EOPNOTSUPP;
927         }
928
929         return parse_nat_setup(ct, manip, attr);
930 }
931 #endif
932
933 static int
934 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
935 {
936         unsigned long d;
937         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
938         d = ct->status ^ status;
939
940         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
941                 /* unchangeable */
942                 return -EBUSY;
943
944         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
945                 /* SEEN_REPLY bit can only be set */
946                 return -EBUSY;
947
948         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
949                 /* ASSURED bit can only be set */
950                 return -EBUSY;
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 static int
960 ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[])
961 {
962 #ifdef CONFIG_NF_NAT_NEEDED
963         int ret;
964
965         if (cda[CTA_NAT_DST]) {
966                 ret = ctnetlink_parse_nat_setup(ct,
967                                                 IP_NAT_MANIP_DST,
968                                                 cda[CTA_NAT_DST]);
969                 if (ret < 0)
970                         return ret;
971         }
972         if (cda[CTA_NAT_SRC]) {
973                 ret = ctnetlink_parse_nat_setup(ct,
974                                                 IP_NAT_MANIP_SRC,
975                                                 cda[CTA_NAT_SRC]);
976                 if (ret < 0)
977                         return ret;
978         }
979         return 0;
980 #else
981         return -EOPNOTSUPP;
982 #endif
983 }
984
985 static inline int
986 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
987 {
988         struct nf_conntrack_helper *helper;
989         struct nf_conn_help *help = nfct_help(ct);
990         char *helpname;
991         int err;
992
993         /* don't change helper of sibling connections */
994         if (ct->master)
995                 return -EBUSY;
996
997         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
998         if (err < 0)
999                 return err;
1000
1001         if (!strcmp(helpname, "")) {
1002                 if (help && help->helper) {
1003                         /* we had a helper before ... */
1004                         nf_ct_remove_expectations(ct);
1005                         rcu_assign_pointer(help->helper, NULL);
1006                 }
1007
1008                 return 0;
1009         }
1010
1011         helper = __nf_conntrack_helper_find_byname(helpname);
1012         if (helper == NULL) {
1013 #ifdef CONFIG_MODULES
1014                 spin_unlock_bh(&nf_conntrack_lock);
1015
1016                 if (request_module("nfct-helper-%s", helpname) < 0) {
1017                         spin_lock_bh(&nf_conntrack_lock);
1018                         return -EOPNOTSUPP;
1019                 }
1020
1021                 spin_lock_bh(&nf_conntrack_lock);
1022                 helper = __nf_conntrack_helper_find_byname(helpname);
1023                 if (helper)
1024                         return -EAGAIN;
1025 #endif
1026                 return -EOPNOTSUPP;
1027         }
1028
1029         if (help) {
1030                 if (help->helper == helper)
1031                         return 0;
1032                 if (help->helper)
1033                         return -EBUSY;
1034                 /* need to zero data of old helper */
1035                 memset(&help->help, 0, sizeof(help->help));
1036         } else {
1037                 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1038                 if (help == NULL)
1039                         return -ENOMEM;
1040         }
1041
1042         rcu_assign_pointer(help->helper, helper);
1043
1044         return 0;
1045 }
1046
1047 static inline int
1048 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
1049 {
1050         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1051
1052         if (!del_timer(&ct->timeout))
1053                 return -ETIME;
1054
1055         ct->timeout.expires = jiffies + timeout * HZ;
1056         add_timer(&ct->timeout);
1057
1058         return 0;
1059 }
1060
1061 static inline int
1062 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1063 {
1064         struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1065         struct nf_conntrack_l4proto *l4proto;
1066         int err = 0;
1067
1068         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1069
1070         rcu_read_lock();
1071         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1072         if (l4proto->from_nlattr)
1073                 err = l4proto->from_nlattr(tb, ct);
1074         rcu_read_unlock();
1075
1076         return err;
1077 }
1078
1079 #ifdef CONFIG_NF_NAT_NEEDED
1080 static inline int
1081 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1082 {
1083         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1084
1085         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1086
1087         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1088                 return -EINVAL;
1089
1090         natseq->correction_pos =
1091                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1092
1093         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1094                 return -EINVAL;
1095
1096         natseq->offset_before =
1097                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1098
1099         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1100                 return -EINVAL;
1101
1102         natseq->offset_after =
1103                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1104
1105         return 0;
1106 }
1107
1108 static int
1109 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1110 {
1111         int ret = 0;
1112         struct nf_conn_nat *nat = nfct_nat(ct);
1113
1114         if (!nat)
1115                 return 0;
1116
1117         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1118                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1119                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1120                 if (ret < 0)
1121                         return ret;
1122
1123                 ct->status |= IPS_SEQ_ADJUST;
1124         }
1125
1126         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1127                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1128                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1129                 if (ret < 0)
1130                         return ret;
1131
1132                 ct->status |= IPS_SEQ_ADJUST;
1133         }
1134
1135         return 0;
1136 }
1137 #endif
1138
1139 static int
1140 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1141 {
1142         int err;
1143
1144         /* only allow NAT changes and master assignation for new conntracks */
1145         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1146                 return -EOPNOTSUPP;
1147
1148         if (cda[CTA_HELP]) {
1149                 err = ctnetlink_change_helper(ct, cda);
1150                 if (err < 0)
1151                         return err;
1152         }
1153
1154         if (cda[CTA_TIMEOUT]) {
1155                 err = ctnetlink_change_timeout(ct, cda);
1156                 if (err < 0)
1157                         return err;
1158         }
1159
1160         if (cda[CTA_STATUS]) {
1161                 err = ctnetlink_change_status(ct, cda);
1162                 if (err < 0)
1163                         return err;
1164         }
1165
1166         if (cda[CTA_PROTOINFO]) {
1167                 err = ctnetlink_change_protoinfo(ct, cda);
1168                 if (err < 0)
1169                         return err;
1170         }
1171
1172 #if defined(CONFIG_NF_CONNTRACK_MARK)
1173         if (cda[CTA_MARK])
1174                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1175 #endif
1176
1177 #ifdef CONFIG_NF_NAT_NEEDED
1178         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1179                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1180                 if (err < 0)
1181                         return err;
1182         }
1183 #endif
1184
1185         return 0;
1186 }
1187
1188 static inline void
1189 ctnetlink_event_report(struct nf_conn *ct, u32 pid, int report)
1190 {
1191         unsigned int events = 0;
1192
1193         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1194                 events |= IPCT_RELATED;
1195         else
1196                 events |= IPCT_NEW;
1197
1198         nf_conntrack_event_report(IPCT_STATUS |
1199                                   IPCT_HELPER |
1200                                   IPCT_REFRESH |
1201                                   IPCT_PROTOINFO |
1202                                   IPCT_NATSEQADJ |
1203                                   IPCT_MARK |
1204                                   events,
1205                                   ct,
1206                                   pid,
1207                                   report);
1208 }
1209
1210 static struct nf_conn *
1211 ctnetlink_create_conntrack(struct nlattr *cda[],
1212                            struct nf_conntrack_tuple *otuple,
1213                            struct nf_conntrack_tuple *rtuple,
1214                            u8 u3)
1215 {
1216         struct nf_conn *ct;
1217         int err = -EINVAL;
1218         struct nf_conntrack_helper *helper;
1219
1220         ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_ATOMIC);
1221         if (IS_ERR(ct))
1222                 return ERR_PTR(-ENOMEM);
1223
1224         if (!cda[CTA_TIMEOUT])
1225                 goto err1;
1226         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1227
1228         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1229         ct->status |= IPS_CONFIRMED;
1230
1231         rcu_read_lock();
1232         if (cda[CTA_HELP]) {
1233                 char *helpname;
1234  
1235                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1236                 if (err < 0)
1237                         goto err2;
1238
1239                 helper = __nf_conntrack_helper_find_byname(helpname);
1240                 if (helper == NULL) {
1241                         rcu_read_unlock();
1242 #ifdef CONFIG_MODULES
1243                         if (request_module("nfct-helper-%s", helpname) < 0) {
1244                                 err = -EOPNOTSUPP;
1245                                 goto err1;
1246                         }
1247
1248                         rcu_read_lock();
1249                         helper = __nf_conntrack_helper_find_byname(helpname);
1250                         if (helper) {
1251                                 err = -EAGAIN;
1252                                 goto err2;
1253                         }
1254                         rcu_read_unlock();
1255 #endif
1256                         err = -EOPNOTSUPP;
1257                         goto err1;
1258                 } else {
1259                         struct nf_conn_help *help;
1260
1261                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1262                         if (help == NULL) {
1263                                 err = -ENOMEM;
1264                                 goto err2;
1265                         }
1266
1267                         /* not in hash table yet so not strictly necessary */
1268                         rcu_assign_pointer(help->helper, helper);
1269                 }
1270         } else {
1271                 /* try an implicit helper assignation */
1272                 err = __nf_ct_try_assign_helper(ct, GFP_ATOMIC);
1273                 if (err < 0)
1274                         goto err2;
1275         }
1276
1277         if (cda[CTA_STATUS]) {
1278                 err = ctnetlink_change_status(ct, cda);
1279                 if (err < 0)
1280                         goto err2;
1281         }
1282
1283         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1284                 err = ctnetlink_change_nat(ct, cda);
1285                 if (err < 0)
1286                         goto err2;
1287         }
1288
1289 #ifdef CONFIG_NF_NAT_NEEDED
1290         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1291                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1292                 if (err < 0)
1293                         goto err2;
1294         }
1295 #endif
1296
1297         if (cda[CTA_PROTOINFO]) {
1298                 err = ctnetlink_change_protoinfo(ct, cda);
1299                 if (err < 0)
1300                         goto err2;
1301         }
1302
1303         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1304
1305 #if defined(CONFIG_NF_CONNTRACK_MARK)
1306         if (cda[CTA_MARK])
1307                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1308 #endif
1309
1310         /* setup master conntrack: this is a confirmed expectation */
1311         if (cda[CTA_TUPLE_MASTER]) {
1312                 struct nf_conntrack_tuple master;
1313                 struct nf_conntrack_tuple_hash *master_h;
1314                 struct nf_conn *master_ct;
1315
1316                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1317                 if (err < 0)
1318                         goto err2;
1319
1320                 master_h = nf_conntrack_find_get(&init_net, &master);
1321                 if (master_h == NULL) {
1322                         err = -ENOENT;
1323                         goto err2;
1324                 }
1325                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1326                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1327                 ct->master = master_ct;
1328         }
1329
1330         add_timer(&ct->timeout);
1331         nf_conntrack_hash_insert(ct);
1332         rcu_read_unlock();
1333
1334         return ct;
1335
1336 err2:
1337         rcu_read_unlock();
1338 err1:
1339         nf_conntrack_free(ct);
1340         return ERR_PTR(err);
1341 }
1342
1343 static int
1344 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1345                         struct nlmsghdr *nlh, struct nlattr *cda[])
1346 {
1347         struct nf_conntrack_tuple otuple, rtuple;
1348         struct nf_conntrack_tuple_hash *h = NULL;
1349         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1350         u_int8_t u3 = nfmsg->nfgen_family;
1351         int err = 0;
1352
1353         if (cda[CTA_TUPLE_ORIG]) {
1354                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1355                 if (err < 0)
1356                         return err;
1357         }
1358
1359         if (cda[CTA_TUPLE_REPLY]) {
1360                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1361                 if (err < 0)
1362                         return err;
1363         }
1364
1365         spin_lock_bh(&nf_conntrack_lock);
1366         if (cda[CTA_TUPLE_ORIG])
1367                 h = __nf_conntrack_find(&init_net, &otuple);
1368         else if (cda[CTA_TUPLE_REPLY])
1369                 h = __nf_conntrack_find(&init_net, &rtuple);
1370
1371         if (h == NULL) {
1372                 err = -ENOENT;
1373                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1374                         struct nf_conn *ct;
1375
1376                         ct = ctnetlink_create_conntrack(cda, &otuple,
1377                                                         &rtuple, u3);
1378                         if (IS_ERR(ct)) {
1379                                 err = PTR_ERR(ct);
1380                                 goto out_unlock;
1381                         }
1382                         err = 0;
1383                         nf_conntrack_get(&ct->ct_general);
1384                         spin_unlock_bh(&nf_conntrack_lock);
1385                         ctnetlink_event_report(ct,
1386                                                NETLINK_CB(skb).pid,
1387                                                nlmsg_report(nlh));
1388                         nf_ct_put(ct);
1389                 } else
1390                         spin_unlock_bh(&nf_conntrack_lock);
1391
1392                 return err;
1393         }
1394         /* implicit 'else' */
1395
1396         /* We manipulate the conntrack inside the global conntrack table lock,
1397          * so there's no need to increase the refcount */
1398         err = -EEXIST;
1399         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1400                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1401
1402                 err = ctnetlink_change_conntrack(ct, cda);
1403                 if (err == 0) {
1404                         nf_conntrack_get(&ct->ct_general);
1405                         spin_unlock_bh(&nf_conntrack_lock);
1406                         ctnetlink_event_report(ct,
1407                                                NETLINK_CB(skb).pid,
1408                                                nlmsg_report(nlh));
1409                         nf_ct_put(ct);
1410                 } else
1411                         spin_unlock_bh(&nf_conntrack_lock);
1412
1413                 return err;
1414         }
1415
1416 out_unlock:
1417         spin_unlock_bh(&nf_conntrack_lock);
1418         return err;
1419 }
1420
1421 /***********************************************************************
1422  * EXPECT
1423  ***********************************************************************/
1424
1425 static inline int
1426 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1427                          const struct nf_conntrack_tuple *tuple,
1428                          enum ctattr_expect type)
1429 {
1430         struct nlattr *nest_parms;
1431
1432         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1433         if (!nest_parms)
1434                 goto nla_put_failure;
1435         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1436                 goto nla_put_failure;
1437         nla_nest_end(skb, nest_parms);
1438
1439         return 0;
1440
1441 nla_put_failure:
1442         return -1;
1443 }
1444
1445 static inline int
1446 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1447                         const struct nf_conntrack_tuple *tuple,
1448                         const struct nf_conntrack_tuple_mask *mask)
1449 {
1450         int ret;
1451         struct nf_conntrack_l3proto *l3proto;
1452         struct nf_conntrack_l4proto *l4proto;
1453         struct nf_conntrack_tuple m;
1454         struct nlattr *nest_parms;
1455
1456         memset(&m, 0xFF, sizeof(m));
1457         m.src.u.all = mask->src.u.all;
1458         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1459
1460         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1461         if (!nest_parms)
1462                 goto nla_put_failure;
1463
1464         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1465         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1466
1467         if (unlikely(ret < 0))
1468                 goto nla_put_failure;
1469
1470         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1471         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1472         if (unlikely(ret < 0))
1473                 goto nla_put_failure;
1474
1475         nla_nest_end(skb, nest_parms);
1476
1477         return 0;
1478
1479 nla_put_failure:
1480         return -1;
1481 }
1482
1483 static int
1484 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1485                           const struct nf_conntrack_expect *exp)
1486 {
1487         struct nf_conn *master = exp->master;
1488         long timeout = (exp->timeout.expires - jiffies) / HZ;
1489
1490         if (timeout < 0)
1491                 timeout = 0;
1492
1493         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1494                 goto nla_put_failure;
1495         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1496                 goto nla_put_failure;
1497         if (ctnetlink_exp_dump_tuple(skb,
1498                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1499                                  CTA_EXPECT_MASTER) < 0)
1500                 goto nla_put_failure;
1501
1502         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1503         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1504
1505         return 0;
1506
1507 nla_put_failure:
1508         return -1;
1509 }
1510
1511 static int
1512 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1513                     int event,
1514                     int nowait,
1515                     const struct nf_conntrack_expect *exp)
1516 {
1517         struct nlmsghdr *nlh;
1518         struct nfgenmsg *nfmsg;
1519         unsigned char *b = skb_tail_pointer(skb);
1520
1521         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1522         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1523         nfmsg  = NLMSG_DATA(nlh);
1524
1525         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1526         nfmsg->nfgen_family = exp->tuple.src.l3num;
1527         nfmsg->version      = NFNETLINK_V0;
1528         nfmsg->res_id       = 0;
1529
1530         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1531                 goto nla_put_failure;
1532
1533         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1534         return skb->len;
1535
1536 nlmsg_failure:
1537 nla_put_failure:
1538         nlmsg_trim(skb, b);
1539         return -1;
1540 }
1541
1542 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1543 static int ctnetlink_expect_event(struct notifier_block *this,
1544                                   unsigned long events, void *ptr)
1545 {
1546         struct nlmsghdr *nlh;
1547         struct nfgenmsg *nfmsg;
1548         struct nf_exp_event *item = (struct nf_exp_event *)ptr;
1549         struct nf_conntrack_expect *exp = item->exp;
1550         struct sk_buff *skb;
1551         unsigned int type;
1552         sk_buff_data_t b;
1553         int flags = 0;
1554
1555         if (events & IPEXP_NEW) {
1556                 type = IPCTNL_MSG_EXP_NEW;
1557                 flags = NLM_F_CREATE|NLM_F_EXCL;
1558         } else
1559                 return NOTIFY_DONE;
1560
1561         if (!item->report &&
1562             !nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1563                 return NOTIFY_DONE;
1564
1565         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1566         if (!skb)
1567                 return NOTIFY_DONE;
1568
1569         b = skb->tail;
1570
1571         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1572         nlh   = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
1573         nfmsg = NLMSG_DATA(nlh);
1574
1575         nlh->nlmsg_flags    = flags;
1576         nfmsg->nfgen_family = exp->tuple.src.l3num;
1577         nfmsg->version      = NFNETLINK_V0;
1578         nfmsg->res_id       = 0;
1579
1580         rcu_read_lock();
1581         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1582                 goto nla_put_failure;
1583         rcu_read_unlock();
1584
1585         nlh->nlmsg_len = skb->tail - b;
1586         nfnetlink_send(skb, item->pid, NFNLGRP_CONNTRACK_EXP_NEW, item->report);
1587         return NOTIFY_DONE;
1588
1589 nla_put_failure:
1590         rcu_read_unlock();
1591 nlmsg_failure:
1592         nfnetlink_set_err(0, 0, -ENOBUFS);
1593         kfree_skb(skb);
1594         return NOTIFY_DONE;
1595 }
1596 #endif
1597 static int ctnetlink_exp_done(struct netlink_callback *cb)
1598 {
1599         if (cb->args[1])
1600                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1601         return 0;
1602 }
1603
1604 static int
1605 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1606 {
1607         struct net *net = &init_net;
1608         struct nf_conntrack_expect *exp, *last;
1609         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1610         struct hlist_node *n;
1611         u_int8_t l3proto = nfmsg->nfgen_family;
1612
1613         rcu_read_lock();
1614         last = (struct nf_conntrack_expect *)cb->args[1];
1615         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1616 restart:
1617                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1618                                      hnode) {
1619                         if (l3proto && exp->tuple.src.l3num != l3proto)
1620                                 continue;
1621                         if (cb->args[1]) {
1622                                 if (exp != last)
1623                                         continue;
1624                                 cb->args[1] = 0;
1625                         }
1626                         if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1627                                                     cb->nlh->nlmsg_seq,
1628                                                     IPCTNL_MSG_EXP_NEW,
1629                                                     1, exp) < 0) {
1630                                 if (!atomic_inc_not_zero(&exp->use))
1631                                         continue;
1632                                 cb->args[1] = (unsigned long)exp;
1633                                 goto out;
1634                         }
1635                 }
1636                 if (cb->args[1]) {
1637                         cb->args[1] = 0;
1638                         goto restart;
1639                 }
1640         }
1641 out:
1642         rcu_read_unlock();
1643         if (last)
1644                 nf_ct_expect_put(last);
1645
1646         return skb->len;
1647 }
1648
1649 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1650         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1651         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1652 };
1653
1654 static int
1655 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1656                      struct nlmsghdr *nlh, struct nlattr *cda[])
1657 {
1658         struct nf_conntrack_tuple tuple;
1659         struct nf_conntrack_expect *exp;
1660         struct sk_buff *skb2;
1661         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1662         u_int8_t u3 = nfmsg->nfgen_family;
1663         int err = 0;
1664
1665         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1666                 return netlink_dump_start(ctnl, skb, nlh,
1667                                           ctnetlink_exp_dump_table,
1668                                           ctnetlink_exp_done);
1669         }
1670
1671         if (cda[CTA_EXPECT_MASTER])
1672                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1673         else
1674                 return -EINVAL;
1675
1676         if (err < 0)
1677                 return err;
1678
1679         exp = nf_ct_expect_find_get(&init_net, &tuple);
1680         if (!exp)
1681                 return -ENOENT;
1682
1683         if (cda[CTA_EXPECT_ID]) {
1684                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1685                 if (ntohl(id) != (u32)(unsigned long)exp) {
1686                         nf_ct_expect_put(exp);
1687                         return -ENOENT;
1688                 }
1689         }
1690
1691         err = -ENOMEM;
1692         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1693         if (!skb2)
1694                 goto out;
1695
1696         rcu_read_lock();
1697         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1698                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1699                                       1, exp);
1700         rcu_read_unlock();
1701         if (err <= 0)
1702                 goto free;
1703
1704         nf_ct_expect_put(exp);
1705
1706         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1707
1708 free:
1709         kfree_skb(skb2);
1710 out:
1711         nf_ct_expect_put(exp);
1712         return err;
1713 }
1714
1715 static int
1716 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1717                      struct nlmsghdr *nlh, struct nlattr *cda[])
1718 {
1719         struct nf_conntrack_expect *exp;
1720         struct nf_conntrack_tuple tuple;
1721         struct nf_conntrack_helper *h;
1722         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1723         struct hlist_node *n, *next;
1724         u_int8_t u3 = nfmsg->nfgen_family;
1725         unsigned int i;
1726         int err;
1727
1728         if (cda[CTA_EXPECT_TUPLE]) {
1729                 /* delete a single expect by tuple */
1730                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1731                 if (err < 0)
1732                         return err;
1733
1734                 /* bump usage count to 2 */
1735                 exp = nf_ct_expect_find_get(&init_net, &tuple);
1736                 if (!exp)
1737                         return -ENOENT;
1738
1739                 if (cda[CTA_EXPECT_ID]) {
1740                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1741                         if (ntohl(id) != (u32)(unsigned long)exp) {
1742                                 nf_ct_expect_put(exp);
1743                                 return -ENOENT;
1744                         }
1745                 }
1746
1747                 /* after list removal, usage count == 1 */
1748                 nf_ct_unexpect_related(exp);
1749                 /* have to put what we 'get' above.
1750                  * after this line usage count == 0 */
1751                 nf_ct_expect_put(exp);
1752         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1753                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1754                 struct nf_conn_help *m_help;
1755
1756                 /* delete all expectations for this helper */
1757                 spin_lock_bh(&nf_conntrack_lock);
1758                 h = __nf_conntrack_helper_find_byname(name);
1759                 if (!h) {
1760                         spin_unlock_bh(&nf_conntrack_lock);
1761                         return -EOPNOTSUPP;
1762                 }
1763                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1764                         hlist_for_each_entry_safe(exp, n, next,
1765                                                   &init_net.ct.expect_hash[i],
1766                                                   hnode) {
1767                                 m_help = nfct_help(exp->master);
1768                                 if (m_help->helper == h
1769                                     && del_timer(&exp->timeout)) {
1770                                         nf_ct_unlink_expect(exp);
1771                                         nf_ct_expect_put(exp);
1772                                 }
1773                         }
1774                 }
1775                 spin_unlock_bh(&nf_conntrack_lock);
1776         } else {
1777                 /* This basically means we have to flush everything*/
1778                 spin_lock_bh(&nf_conntrack_lock);
1779                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1780                         hlist_for_each_entry_safe(exp, n, next,
1781                                                   &init_net.ct.expect_hash[i],
1782                                                   hnode) {
1783                                 if (del_timer(&exp->timeout)) {
1784                                         nf_ct_unlink_expect(exp);
1785                                         nf_ct_expect_put(exp);
1786                                 }
1787                         }
1788                 }
1789                 spin_unlock_bh(&nf_conntrack_lock);
1790         }
1791
1792         return 0;
1793 }
1794 static int
1795 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1796 {
1797         return -EOPNOTSUPP;
1798 }
1799
1800 static int
1801 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3, u32 pid, int report)
1802 {
1803         struct nf_conntrack_tuple tuple, mask, master_tuple;
1804         struct nf_conntrack_tuple_hash *h = NULL;
1805         struct nf_conntrack_expect *exp;
1806         struct nf_conn *ct;
1807         struct nf_conn_help *help;
1808         int err = 0;
1809
1810         /* caller guarantees that those three CTA_EXPECT_* exist */
1811         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1812         if (err < 0)
1813                 return err;
1814         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1815         if (err < 0)
1816                 return err;
1817         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1818         if (err < 0)
1819                 return err;
1820
1821         /* Look for master conntrack of this expectation */
1822         h = nf_conntrack_find_get(&init_net, &master_tuple);
1823         if (!h)
1824                 return -ENOENT;
1825         ct = nf_ct_tuplehash_to_ctrack(h);
1826         help = nfct_help(ct);
1827
1828         if (!help || !help->helper) {
1829                 /* such conntrack hasn't got any helper, abort */
1830                 err = -EOPNOTSUPP;
1831                 goto out;
1832         }
1833
1834         exp = nf_ct_expect_alloc(ct);
1835         if (!exp) {
1836                 err = -ENOMEM;
1837                 goto out;
1838         }
1839
1840         exp->class = 0;
1841         exp->expectfn = NULL;
1842         exp->flags = 0;
1843         exp->master = ct;
1844         exp->helper = NULL;
1845         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1846         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1847         exp->mask.src.u.all = mask.src.u.all;
1848
1849         err = nf_ct_expect_related_report(exp, pid, report);
1850         nf_ct_expect_put(exp);
1851
1852 out:
1853         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1854         return err;
1855 }
1856
1857 static int
1858 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1859                      struct nlmsghdr *nlh, struct nlattr *cda[])
1860 {
1861         struct nf_conntrack_tuple tuple;
1862         struct nf_conntrack_expect *exp;
1863         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1864         u_int8_t u3 = nfmsg->nfgen_family;
1865         int err = 0;
1866
1867         if (!cda[CTA_EXPECT_TUPLE]
1868             || !cda[CTA_EXPECT_MASK]
1869             || !cda[CTA_EXPECT_MASTER])
1870                 return -EINVAL;
1871
1872         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1873         if (err < 0)
1874                 return err;
1875
1876         spin_lock_bh(&nf_conntrack_lock);
1877         exp = __nf_ct_expect_find(&init_net, &tuple);
1878
1879         if (!exp) {
1880                 spin_unlock_bh(&nf_conntrack_lock);
1881                 err = -ENOENT;
1882                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1883                         err = ctnetlink_create_expect(cda,
1884                                                       u3,
1885                                                       NETLINK_CB(skb).pid,
1886                                                       nlmsg_report(nlh));
1887                 }
1888                 return err;
1889         }
1890
1891         err = -EEXIST;
1892         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1893                 err = ctnetlink_change_expect(exp, cda);
1894         spin_unlock_bh(&nf_conntrack_lock);
1895
1896         return err;
1897 }
1898
1899 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1900 static struct notifier_block ctnl_notifier = {
1901         .notifier_call  = ctnetlink_conntrack_event,
1902 };
1903
1904 static struct notifier_block ctnl_notifier_exp = {
1905         .notifier_call  = ctnetlink_expect_event,
1906 };
1907 #endif
1908
1909 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1910         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1911                                             .attr_count = CTA_MAX,
1912                                             .policy = ct_nla_policy },
1913         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1914                                             .attr_count = CTA_MAX,
1915                                             .policy = ct_nla_policy },
1916         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1917                                             .attr_count = CTA_MAX,
1918                                             .policy = ct_nla_policy },
1919         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1920                                             .attr_count = CTA_MAX,
1921                                             .policy = ct_nla_policy },
1922 };
1923
1924 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1925         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1926                                             .attr_count = CTA_EXPECT_MAX,
1927                                             .policy = exp_nla_policy },
1928         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1929                                             .attr_count = CTA_EXPECT_MAX,
1930                                             .policy = exp_nla_policy },
1931         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1932                                             .attr_count = CTA_EXPECT_MAX,
1933                                             .policy = exp_nla_policy },
1934 };
1935
1936 static const struct nfnetlink_subsystem ctnl_subsys = {
1937         .name                           = "conntrack",
1938         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1939         .cb_count                       = IPCTNL_MSG_MAX,
1940         .cb                             = ctnl_cb,
1941 };
1942
1943 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1944         .name                           = "conntrack_expect",
1945         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1946         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1947         .cb                             = ctnl_exp_cb,
1948 };
1949
1950 MODULE_ALIAS("ip_conntrack_netlink");
1951 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1952 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1953
1954 static int __init ctnetlink_init(void)
1955 {
1956         int ret;
1957
1958         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1959         ret = nfnetlink_subsys_register(&ctnl_subsys);
1960         if (ret < 0) {
1961                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1962                 goto err_out;
1963         }
1964
1965         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1966         if (ret < 0) {
1967                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1968                 goto err_unreg_subsys;
1969         }
1970
1971 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1972         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1973         if (ret < 0) {
1974                 printk("ctnetlink_init: cannot register notifier.\n");
1975                 goto err_unreg_exp_subsys;
1976         }
1977
1978         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1979         if (ret < 0) {
1980                 printk("ctnetlink_init: cannot expect register notifier.\n");
1981                 goto err_unreg_notifier;
1982         }
1983 #endif
1984
1985         return 0;
1986
1987 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1988 err_unreg_notifier:
1989         nf_conntrack_unregister_notifier(&ctnl_notifier);
1990 err_unreg_exp_subsys:
1991         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1992 #endif
1993 err_unreg_subsys:
1994         nfnetlink_subsys_unregister(&ctnl_subsys);
1995 err_out:
1996         return ret;
1997 }
1998
1999 static void __exit ctnetlink_exit(void)
2000 {
2001         printk("ctnetlink: unregistering from nfnetlink.\n");
2002
2003 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2004         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2005         nf_conntrack_unregister_notifier(&ctnl_notifier);
2006 #endif
2007
2008         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2009         nfnetlink_subsys_unregister(&ctnl_subsys);
2010         return;
2011 }
2012
2013 module_init(ctnetlink_init);
2014 module_exit(ctnetlink_exit);