5fcf91d617cd44e66a59559b31636c144307a6ac
[linux-2.6.git] / net / ipv4 / netfilter / ip_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) 2002-2005 by Harald Welte <laforge@gnumonks.org>
6  * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7  * (C) 2005-2006 by Pablo Neira Ayuso <pablo@eurodev.net>
8  *
9  * I've reworked this stuff to use attributes instead of conntrack 
10  * structures. 5.44 am. I need more tea. --pablo 05/07/11.
11  *
12  * Initial connection tracking via netlink development funded and 
13  * generally made possible by Network Robots, Inc. (www.networkrobots.com)
14  *
15  * Further development of this code funded by Astaro AG (http://www.astaro.com)
16  *
17  * This software may be used and distributed according to the terms
18  * of the GNU General Public License, incorporated herein by reference.
19  */
20
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/types.h>
25 #include <linux/timer.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/notifier.h>
32
33 #include <linux/netfilter.h>
34 #include <linux/netfilter_ipv4/ip_conntrack.h>
35 #include <linux/netfilter_ipv4/ip_conntrack_core.h>
36 #include <linux/netfilter_ipv4/ip_conntrack_helper.h>
37 #include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
38 #include <linux/netfilter_ipv4/ip_nat_protocol.h>
39
40 #include <linux/netfilter/nfnetlink.h>
41 #include <linux/netfilter/nfnetlink_conntrack.h>
42
43 MODULE_LICENSE("GPL");
44
45 static char __initdata version[] = "0.90";
46
47 static inline int
48 ctnetlink_dump_tuples_proto(struct sk_buff *skb, 
49                             const struct ip_conntrack_tuple *tuple,
50                             struct ip_conntrack_protocol *proto)
51 {
52         int ret = 0;
53         struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
54
55         NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
56
57         if (likely(proto->tuple_to_nfattr))
58                 ret = proto->tuple_to_nfattr(skb, tuple);
59         
60         NFA_NEST_END(skb, nest_parms);
61
62         return ret;
63
64 nfattr_failure:
65         return -1;
66 }
67
68 static inline int
69 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
70                          const struct ip_conntrack_tuple *tuple)
71 {
72         struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
73         
74         NFA_PUT(skb, CTA_IP_V4_SRC, sizeof(__be32), &tuple->src.ip);
75         NFA_PUT(skb, CTA_IP_V4_DST, sizeof(__be32), &tuple->dst.ip);
76
77         NFA_NEST_END(skb, nest_parms);
78
79         return 0;
80
81 nfattr_failure:
82         return -1;
83 }
84
85 static inline int
86 ctnetlink_dump_tuples(struct sk_buff *skb,
87                       const struct ip_conntrack_tuple *tuple)
88 {
89         int ret;
90         struct ip_conntrack_protocol *proto;
91
92         ret = ctnetlink_dump_tuples_ip(skb, tuple);
93         if (unlikely(ret < 0))
94                 return ret;
95
96         proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
97         ret = ctnetlink_dump_tuples_proto(skb, tuple, proto);
98         ip_conntrack_proto_put(proto);
99
100         return ret;
101 }
102
103 static inline int
104 ctnetlink_dump_status(struct sk_buff *skb, const struct ip_conntrack *ct)
105 {
106         __be32 status = htonl((u_int32_t) ct->status);
107         NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
108         return 0;
109
110 nfattr_failure:
111         return -1;
112 }
113
114 static inline int
115 ctnetlink_dump_timeout(struct sk_buff *skb, const struct ip_conntrack *ct)
116 {
117         long timeout_l = ct->timeout.expires - jiffies;
118         __be32 timeout;
119
120         if (timeout_l < 0)
121                 timeout = 0;
122         else
123                 timeout = htonl(timeout_l / HZ);
124         
125         NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
126         return 0;
127
128 nfattr_failure:
129         return -1;
130 }
131
132 static inline int
133 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
134 {
135         struct ip_conntrack_protocol *proto = ip_conntrack_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
136
137         struct nfattr *nest_proto;
138         int ret;
139
140         if (!proto->to_nfattr) {
141                 ip_conntrack_proto_put(proto);
142                 return 0;
143         }
144         
145         nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
146
147         ret = proto->to_nfattr(skb, nest_proto, ct);
148
149         ip_conntrack_proto_put(proto);
150
151         NFA_NEST_END(skb, nest_proto);
152
153         return ret;
154
155 nfattr_failure:
156         ip_conntrack_proto_put(proto);
157         return -1;
158 }
159
160 static inline int
161 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
162 {
163         struct nfattr *nest_helper;
164
165         if (!ct->helper)
166                 return 0;
167                 
168         nest_helper = NFA_NEST(skb, CTA_HELP);
169         NFA_PUT(skb, CTA_HELP_NAME, strlen(ct->helper->name), ct->helper->name);
170
171         if (ct->helper->to_nfattr)
172                 ct->helper->to_nfattr(skb, ct);
173
174         NFA_NEST_END(skb, nest_helper);
175
176         return 0;
177
178 nfattr_failure:
179         return -1;
180 }
181
182 #ifdef CONFIG_IP_NF_CT_ACCT
183 static inline int
184 ctnetlink_dump_counters(struct sk_buff *skb, const struct ip_conntrack *ct,
185                         enum ip_conntrack_dir dir)
186 {
187         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
188         struct nfattr *nest_count = NFA_NEST(skb, type);
189         __be32 tmp;
190
191         tmp = htonl(ct->counters[dir].packets);
192         NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(__be32), &tmp);
193
194         tmp = htonl(ct->counters[dir].bytes);
195         NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(__be32), &tmp);
196
197         NFA_NEST_END(skb, nest_count);
198
199         return 0;
200
201 nfattr_failure:
202         return -1;
203 }
204 #else
205 #define ctnetlink_dump_counters(a, b, c) (0)
206 #endif
207
208 #ifdef CONFIG_IP_NF_CONNTRACK_MARK
209 static inline int
210 ctnetlink_dump_mark(struct sk_buff *skb, const struct ip_conntrack *ct)
211 {
212         __be32 mark = htonl(ct->mark);
213
214         NFA_PUT(skb, CTA_MARK, sizeof(__be32), &mark);
215         return 0;
216
217 nfattr_failure:
218         return -1;
219 }
220 #else
221 #define ctnetlink_dump_mark(a, b) (0)
222 #endif
223
224 static inline int
225 ctnetlink_dump_id(struct sk_buff *skb, const struct ip_conntrack *ct)
226 {
227         __be32 id = htonl(ct->id);
228         NFA_PUT(skb, CTA_ID, sizeof(__be32), &id);
229         return 0;
230
231 nfattr_failure:
232         return -1;
233 }
234
235 static inline int
236 ctnetlink_dump_use(struct sk_buff *skb, const struct ip_conntrack *ct)
237 {
238         __be32 use = htonl(atomic_read(&ct->ct_general.use));
239         
240         NFA_PUT(skb, CTA_USE, sizeof(__be32), &use);
241         return 0;
242
243 nfattr_failure:
244         return -1;
245 }
246
247 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
248
249 static int
250 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
251                     int event, int nowait, 
252                     const struct ip_conntrack *ct)
253 {
254         struct nlmsghdr *nlh;
255         struct nfgenmsg *nfmsg;
256         struct nfattr *nest_parms;
257         unsigned char *b;
258
259         b = skb->tail;
260
261         event |= NFNL_SUBSYS_CTNETLINK << 8;
262         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
263         nfmsg  = NLMSG_DATA(nlh);
264
265         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
266         nfmsg->nfgen_family = AF_INET;
267         nfmsg->version      = NFNETLINK_V0;
268         nfmsg->res_id       = 0;
269
270         nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
271         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
272                 goto nfattr_failure;
273         NFA_NEST_END(skb, nest_parms);
274         
275         nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
276         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
277                 goto nfattr_failure;
278         NFA_NEST_END(skb, nest_parms);
279
280         if (ctnetlink_dump_status(skb, ct) < 0 ||
281             ctnetlink_dump_timeout(skb, ct) < 0 ||
282             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
283             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
284             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
285             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
286             ctnetlink_dump_mark(skb, ct) < 0 ||
287             ctnetlink_dump_id(skb, ct) < 0 ||
288             ctnetlink_dump_use(skb, ct) < 0)
289                 goto nfattr_failure;
290
291         nlh->nlmsg_len = skb->tail - b;
292         return skb->len;
293
294 nlmsg_failure:
295 nfattr_failure:
296         skb_trim(skb, b - skb->data);
297         return -1;
298 }
299
300 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
301 static int ctnetlink_conntrack_event(struct notifier_block *this,
302                                      unsigned long events, void *ptr)
303 {
304         struct nlmsghdr *nlh;
305         struct nfgenmsg *nfmsg;
306         struct nfattr *nest_parms;
307         struct ip_conntrack *ct = (struct ip_conntrack *)ptr;
308         struct sk_buff *skb;
309         unsigned int type;
310         unsigned char *b;
311         unsigned int flags = 0, group;
312
313         /* ignore our fake conntrack entry */
314         if (ct == &ip_conntrack_untracked)
315                 return NOTIFY_DONE;
316
317         if (events & IPCT_DESTROY) {
318                 type = IPCTNL_MSG_CT_DELETE;
319                 group = NFNLGRP_CONNTRACK_DESTROY;
320         } else if (events & (IPCT_NEW | IPCT_RELATED)) {
321                 type = IPCTNL_MSG_CT_NEW;
322                 flags = NLM_F_CREATE|NLM_F_EXCL;
323                 group = NFNLGRP_CONNTRACK_NEW;
324         } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
325                 type = IPCTNL_MSG_CT_NEW;
326                 group = NFNLGRP_CONNTRACK_UPDATE;
327         } else 
328                 return NOTIFY_DONE;
329
330         if (!nfnetlink_has_listeners(group))
331                 return NOTIFY_DONE;
332
333         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
334         if (!skb)
335                 return NOTIFY_DONE;
336
337         b = skb->tail;
338
339         type |= NFNL_SUBSYS_CTNETLINK << 8;
340         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
341         nfmsg = NLMSG_DATA(nlh);
342
343         nlh->nlmsg_flags    = flags;
344         nfmsg->nfgen_family = AF_INET;
345         nfmsg->version  = NFNETLINK_V0;
346         nfmsg->res_id   = 0;
347
348         nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
349         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
350                 goto nfattr_failure;
351         NFA_NEST_END(skb, nest_parms);
352         
353         nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
354         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
355                 goto nfattr_failure;
356         NFA_NEST_END(skb, nest_parms);
357
358         if (events & IPCT_DESTROY) {
359                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
360                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
361                         goto nfattr_failure;
362         } else {
363                 if (ctnetlink_dump_status(skb, ct) < 0)
364                         goto nfattr_failure;
365
366                 if (ctnetlink_dump_timeout(skb, ct) < 0)
367                         goto nfattr_failure;
368
369                 if (events & IPCT_PROTOINFO
370                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
371                         goto nfattr_failure;
372
373                 if ((events & IPCT_HELPER || ct->helper)
374                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
375                         goto nfattr_failure;
376
377                 if ((events & IPCT_MARK || ct->mark)
378                     && ctnetlink_dump_mark(skb, ct) < 0)
379                         goto nfattr_failure;
380
381                 if (events & IPCT_COUNTER_FILLING &&
382                     (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
383                      ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
384                         goto nfattr_failure;
385         }
386
387         nlh->nlmsg_len = skb->tail - b;
388         nfnetlink_send(skb, 0, group, 0);
389         return NOTIFY_DONE;
390
391 nlmsg_failure:
392 nfattr_failure:
393         kfree_skb(skb);
394         return NOTIFY_DONE;
395 }
396 #endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
397
398 static int ctnetlink_done(struct netlink_callback *cb)
399 {
400         if (cb->args[1])
401                 ip_conntrack_put((struct ip_conntrack *)cb->args[1]);
402         return 0;
403 }
404
405 static int
406 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
407 {
408         struct ip_conntrack *ct, *last;
409         struct ip_conntrack_tuple_hash *h;
410         struct list_head *i;
411
412         read_lock_bh(&ip_conntrack_lock);
413         last = (struct ip_conntrack *)cb->args[1];
414         for (; cb->args[0] < ip_conntrack_htable_size; cb->args[0]++) {
415 restart:
416                 list_for_each_prev(i, &ip_conntrack_hash[cb->args[0]]) {
417                         h = (struct ip_conntrack_tuple_hash *) i;
418                         if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
419                                 continue;
420                         ct = tuplehash_to_ctrack(h);
421                         if (cb->args[1]) {
422                                 if (ct != last)
423                                         continue;
424                                 cb->args[1] = 0;
425                         }
426                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
427                                                 cb->nlh->nlmsg_seq,
428                                                 IPCTNL_MSG_CT_NEW,
429                                                 1, ct) < 0) {
430                                 nf_conntrack_get(&ct->ct_general);
431                                 cb->args[1] = (unsigned long)ct;
432                                 goto out;
433                         }
434 #ifdef CONFIG_NF_CT_ACCT
435                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
436                                                 IPCTNL_MSG_CT_GET_CTRZERO)
437                                 memset(&ct->counters, 0, sizeof(ct->counters));
438 #endif
439                 }
440                 if (cb->args[1]) {
441                         cb->args[1] = 0;
442                         goto restart;
443                 }
444         }
445 out:
446         read_unlock_bh(&ip_conntrack_lock);
447         if (last)
448                 ip_conntrack_put(last);
449
450         return skb->len;
451 }
452
453 static const size_t cta_min_ip[CTA_IP_MAX] = {
454         [CTA_IP_V4_SRC-1]       = sizeof(__be32),
455         [CTA_IP_V4_DST-1]       = sizeof(__be32),
456 };
457
458 static inline int
459 ctnetlink_parse_tuple_ip(struct nfattr *attr, struct ip_conntrack_tuple *tuple)
460 {
461         struct nfattr *tb[CTA_IP_MAX];
462
463         nfattr_parse_nested(tb, CTA_IP_MAX, attr);
464
465         if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip))
466                 return -EINVAL;
467
468         if (!tb[CTA_IP_V4_SRC-1])
469                 return -EINVAL;
470         tuple->src.ip = *(__be32 *)NFA_DATA(tb[CTA_IP_V4_SRC-1]);
471
472         if (!tb[CTA_IP_V4_DST-1])
473                 return -EINVAL;
474         tuple->dst.ip = *(__be32 *)NFA_DATA(tb[CTA_IP_V4_DST-1]);
475
476         return 0;
477 }
478
479 static const size_t cta_min_proto[CTA_PROTO_MAX] = {
480         [CTA_PROTO_NUM-1]       = sizeof(u_int8_t),
481         [CTA_PROTO_SRC_PORT-1]  = sizeof(u_int16_t),
482         [CTA_PROTO_DST_PORT-1]  = sizeof(u_int16_t),
483         [CTA_PROTO_ICMP_TYPE-1] = sizeof(u_int8_t),
484         [CTA_PROTO_ICMP_CODE-1] = sizeof(u_int8_t),
485         [CTA_PROTO_ICMP_ID-1]   = sizeof(u_int16_t),
486 };
487
488 static inline int
489 ctnetlink_parse_tuple_proto(struct nfattr *attr, 
490                             struct ip_conntrack_tuple *tuple)
491 {
492         struct nfattr *tb[CTA_PROTO_MAX];
493         struct ip_conntrack_protocol *proto;
494         int ret = 0;
495
496         nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
497
498         if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
499                 return -EINVAL;
500
501         if (!tb[CTA_PROTO_NUM-1])
502                 return -EINVAL;
503         tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
504
505         proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
506
507         if (likely(proto->nfattr_to_tuple))
508                 ret = proto->nfattr_to_tuple(tb, tuple);
509         
510         ip_conntrack_proto_put(proto);
511         
512         return ret;
513 }
514
515 static inline int
516 ctnetlink_parse_tuple(struct nfattr *cda[], struct ip_conntrack_tuple *tuple,
517                       enum ctattr_tuple type)
518 {
519         struct nfattr *tb[CTA_TUPLE_MAX];
520         int err;
521
522         memset(tuple, 0, sizeof(*tuple));
523
524         nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
525
526         if (!tb[CTA_TUPLE_IP-1])
527                 return -EINVAL;
528
529         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
530         if (err < 0)
531                 return err;
532
533         if (!tb[CTA_TUPLE_PROTO-1])
534                 return -EINVAL;
535
536         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
537         if (err < 0)
538                 return err;
539
540         /* orig and expect tuples get DIR_ORIGINAL */
541         if (type == CTA_TUPLE_REPLY)
542                 tuple->dst.dir = IP_CT_DIR_REPLY;
543         else
544                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
545
546         return 0;
547 }
548
549 #ifdef CONFIG_IP_NF_NAT_NEEDED
550 static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
551         [CTA_PROTONAT_PORT_MIN-1]       = sizeof(u_int16_t),
552         [CTA_PROTONAT_PORT_MAX-1]       = sizeof(u_int16_t),
553 };
554
555 static int ctnetlink_parse_nat_proto(struct nfattr *attr,
556                                      const struct ip_conntrack *ct,
557                                      struct ip_nat_range *range)
558 {
559         struct nfattr *tb[CTA_PROTONAT_MAX];
560         struct ip_nat_protocol *npt;
561
562         nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
563
564         if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
565                 return -EINVAL;
566
567         npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
568
569         if (!npt->nfattr_to_range) {
570                 ip_nat_proto_put(npt);
571                 return 0;
572         }
573
574         /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
575         if (npt->nfattr_to_range(tb, range) > 0)
576                 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
577
578         ip_nat_proto_put(npt);
579
580         return 0;
581 }
582
583 static const size_t cta_min_nat[CTA_NAT_MAX] = {
584         [CTA_NAT_MINIP-1]       = sizeof(__be32),
585         [CTA_NAT_MAXIP-1]       = sizeof(__be32),
586 };
587
588 static inline int
589 ctnetlink_parse_nat(struct nfattr *nat,
590                     const struct ip_conntrack *ct, struct ip_nat_range *range)
591 {
592         struct nfattr *tb[CTA_NAT_MAX];
593         int err;
594
595         memset(range, 0, sizeof(*range));
596         
597         nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
598
599         if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
600                 return -EINVAL;
601
602         if (tb[CTA_NAT_MINIP-1])
603                 range->min_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
604
605         if (!tb[CTA_NAT_MAXIP-1])
606                 range->max_ip = range->min_ip;
607         else
608                 range->max_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
609
610         if (range->min_ip)
611                 range->flags |= IP_NAT_RANGE_MAP_IPS;
612
613         if (!tb[CTA_NAT_PROTO-1])
614                 return 0;
615
616         err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
617         if (err < 0)
618                 return err;
619
620         return 0;
621 }
622 #endif
623
624 static inline int
625 ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
626 {
627         struct nfattr *tb[CTA_HELP_MAX];
628
629         nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
630
631         if (!tb[CTA_HELP_NAME-1])
632                 return -EINVAL;
633
634         *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
635
636         return 0;
637 }
638
639 static const size_t cta_min[CTA_MAX] = {
640         [CTA_STATUS-1]          = sizeof(__be32),
641         [CTA_TIMEOUT-1]         = sizeof(__be32),
642         [CTA_MARK-1]            = sizeof(__be32),
643         [CTA_USE-1]             = sizeof(__be32),
644         [CTA_ID-1]              = sizeof(__be32)
645 };
646
647 static int
648 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb, 
649                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
650 {
651         struct ip_conntrack_tuple_hash *h;
652         struct ip_conntrack_tuple tuple;
653         struct ip_conntrack *ct;
654         int err = 0;
655
656         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
657                 return -EINVAL;
658
659         if (cda[CTA_TUPLE_ORIG-1])
660                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
661         else if (cda[CTA_TUPLE_REPLY-1])
662                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
663         else {
664                 /* Flush the whole table */
665                 ip_conntrack_flush();
666                 return 0;
667         }
668
669         if (err < 0)
670                 return err;
671
672         h = ip_conntrack_find_get(&tuple, NULL);
673         if (!h)
674                 return -ENOENT;
675
676         ct = tuplehash_to_ctrack(h);
677         
678         if (cda[CTA_ID-1]) {
679                 u_int32_t id = ntohl(*(__be32 *)NFA_DATA(cda[CTA_ID-1]));
680                 if (ct->id != id) {
681                         ip_conntrack_put(ct);
682                         return -ENOENT;
683                 }
684         }       
685         if (del_timer(&ct->timeout))
686                 ct->timeout.function((unsigned long)ct);
687
688         ip_conntrack_put(ct);
689
690         return 0;
691 }
692
693 static int
694 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb, 
695                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
696 {
697         struct ip_conntrack_tuple_hash *h;
698         struct ip_conntrack_tuple tuple;
699         struct ip_conntrack *ct;
700         struct sk_buff *skb2 = NULL;
701         int err = 0;
702
703         if (nlh->nlmsg_flags & NLM_F_DUMP) {
704                 struct nfgenmsg *msg = NLMSG_DATA(nlh);
705                 u32 rlen;
706
707                 if (msg->nfgen_family != AF_INET)
708                         return -EAFNOSUPPORT;
709
710 #ifndef CONFIG_IP_NF_CT_ACCT
711                 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
712                         return -ENOTSUPP;
713 #endif
714                 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
715                                                 ctnetlink_dump_table,
716                                                 ctnetlink_done)) != 0)
717                         return -EINVAL;
718
719                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
720                 if (rlen > skb->len)
721                         rlen = skb->len;
722                 skb_pull(skb, rlen);
723                 return 0;
724         }
725
726         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
727                 return -EINVAL;
728
729         if (cda[CTA_TUPLE_ORIG-1])
730                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
731         else if (cda[CTA_TUPLE_REPLY-1])
732                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
733         else
734                 return -EINVAL;
735
736         if (err < 0)
737                 return err;
738
739         h = ip_conntrack_find_get(&tuple, NULL);
740         if (!h)
741                 return -ENOENT;
742
743         ct = tuplehash_to_ctrack(h);
744
745         err = -ENOMEM;
746         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
747         if (!skb2) {
748                 ip_conntrack_put(ct);
749                 return -ENOMEM;
750         }
751
752         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 
753                                   IPCTNL_MSG_CT_NEW, 1, ct);
754         ip_conntrack_put(ct);
755         if (err <= 0)
756                 goto free;
757
758         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
759         if (err < 0)
760                 goto out;
761
762         return 0;
763
764 free:
765         kfree_skb(skb2);
766 out:
767         return err;
768 }
769
770 static inline int
771 ctnetlink_change_status(struct ip_conntrack *ct, struct nfattr *cda[])
772 {
773         unsigned long d;
774         unsigned status = ntohl(*(__be32 *)NFA_DATA(cda[CTA_STATUS-1]));
775         d = ct->status ^ status;
776
777         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
778                 /* unchangeable */
779                 return -EINVAL;
780         
781         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
782                 /* SEEN_REPLY bit can only be set */
783                 return -EINVAL;
784
785         
786         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
787                 /* ASSURED bit can only be set */
788                 return -EINVAL;
789
790         if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
791 #ifndef CONFIG_IP_NF_NAT_NEEDED
792                 return -EINVAL;
793 #else
794                 struct ip_nat_range range;
795
796                 if (cda[CTA_NAT_DST-1]) {
797                         if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
798                                                 &range) < 0)
799                                 return -EINVAL;
800                         if (ip_nat_initialized(ct,
801                                                HOOK2MANIP(NF_IP_PRE_ROUTING)))
802                                 return -EEXIST;
803                         ip_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
804                 }
805                 if (cda[CTA_NAT_SRC-1]) {
806                         if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
807                                                 &range) < 0)
808                                 return -EINVAL;
809                         if (ip_nat_initialized(ct,
810                                                HOOK2MANIP(NF_IP_POST_ROUTING)))
811                                 return -EEXIST;
812                         ip_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
813                 }
814 #endif
815         }
816
817         /* Be careful here, modifying NAT bits can screw up things,
818          * so don't let users modify them directly if they don't pass
819          * ip_nat_range. */
820         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
821         return 0;
822 }
823
824
825 static inline int
826 ctnetlink_change_helper(struct ip_conntrack *ct, struct nfattr *cda[])
827 {
828         struct ip_conntrack_helper *helper;
829         char *helpname;
830         int err;
831
832         /* don't change helper of sibling connections */
833         if (ct->master)
834                 return -EINVAL;
835
836         err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
837         if (err < 0)
838                 return err;
839
840         helper = __ip_conntrack_helper_find_byname(helpname);
841         if (!helper) {
842                 if (!strcmp(helpname, ""))
843                         helper = NULL;
844                 else
845                         return -EINVAL;
846         }
847
848         if (ct->helper) {
849                 if (!helper) {
850                         /* we had a helper before ... */
851                         ip_ct_remove_expectations(ct);
852                         ct->helper = NULL;
853                 } else {
854                         /* need to zero data of old helper */
855                         memset(&ct->help, 0, sizeof(ct->help));
856                 }
857         }
858         
859         ct->helper = helper;
860
861         return 0;
862 }
863
864 static inline int
865 ctnetlink_change_timeout(struct ip_conntrack *ct, struct nfattr *cda[])
866 {
867         u_int32_t timeout = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
868         
869         if (!del_timer(&ct->timeout))
870                 return -ETIME;
871
872         ct->timeout.expires = jiffies + timeout * HZ;
873         add_timer(&ct->timeout);
874
875         return 0;
876 }
877
878 static inline int
879 ctnetlink_change_protoinfo(struct ip_conntrack *ct, struct nfattr *cda[])
880 {
881         struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
882         struct ip_conntrack_protocol *proto;
883         u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
884         int err = 0;
885
886         nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
887
888         proto = ip_conntrack_proto_find_get(npt);
889
890         if (proto->from_nfattr)
891                 err = proto->from_nfattr(tb, ct);
892         ip_conntrack_proto_put(proto); 
893
894         return err;
895 }
896
897 static int
898 ctnetlink_change_conntrack(struct ip_conntrack *ct, struct nfattr *cda[])
899 {
900         int err;
901
902         if (cda[CTA_HELP-1]) {
903                 err = ctnetlink_change_helper(ct, cda);
904                 if (err < 0)
905                         return err;
906         }
907
908         if (cda[CTA_TIMEOUT-1]) {
909                 err = ctnetlink_change_timeout(ct, cda);
910                 if (err < 0)
911                         return err;
912         }
913
914         if (cda[CTA_STATUS-1]) {
915                 err = ctnetlink_change_status(ct, cda);
916                 if (err < 0)
917                         return err;
918         }
919
920         if (cda[CTA_PROTOINFO-1]) {
921                 err = ctnetlink_change_protoinfo(ct, cda);
922                 if (err < 0)
923                         return err;
924         }
925
926 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
927         if (cda[CTA_MARK-1])
928                 ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
929 #endif
930
931         return 0;
932 }
933
934 static int
935 ctnetlink_create_conntrack(struct nfattr *cda[], 
936                            struct ip_conntrack_tuple *otuple,
937                            struct ip_conntrack_tuple *rtuple)
938 {
939         struct ip_conntrack *ct;
940         int err = -EINVAL;
941
942         ct = ip_conntrack_alloc(otuple, rtuple);
943         if (ct == NULL || IS_ERR(ct))
944                 return -ENOMEM; 
945
946         if (!cda[CTA_TIMEOUT-1])
947                 goto err;
948         ct->timeout.expires = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
949
950         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
951         ct->status |= IPS_CONFIRMED;
952
953         if (cda[CTA_STATUS-1]) {
954                 err = ctnetlink_change_status(ct, cda);
955                 if (err < 0)
956                         goto err;
957         }
958
959         if (cda[CTA_PROTOINFO-1]) {
960                 err = ctnetlink_change_protoinfo(ct, cda);
961                 if (err < 0)
962                         return err;
963         }
964
965 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
966         if (cda[CTA_MARK-1])
967                 ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
968 #endif
969
970         ct->helper = ip_conntrack_helper_find_get(rtuple);
971
972         add_timer(&ct->timeout);
973         ip_conntrack_hash_insert(ct);
974
975         if (ct->helper)
976                 ip_conntrack_helper_put(ct->helper);
977
978         return 0;
979
980 err:    
981         ip_conntrack_free(ct);
982         return err;
983 }
984
985 static int 
986 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb, 
987                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
988 {
989         struct ip_conntrack_tuple otuple, rtuple;
990         struct ip_conntrack_tuple_hash *h = NULL;
991         int err = 0;
992
993         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
994                 return -EINVAL;
995
996         if (cda[CTA_TUPLE_ORIG-1]) {
997                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG);
998                 if (err < 0)
999                         return err;
1000         }
1001
1002         if (cda[CTA_TUPLE_REPLY-1]) {
1003                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY);
1004                 if (err < 0)
1005                         return err;
1006         }
1007
1008         write_lock_bh(&ip_conntrack_lock);
1009         if (cda[CTA_TUPLE_ORIG-1])
1010                 h = __ip_conntrack_find(&otuple, NULL);
1011         else if (cda[CTA_TUPLE_REPLY-1])
1012                 h = __ip_conntrack_find(&rtuple, NULL);
1013
1014         if (h == NULL) {
1015                 write_unlock_bh(&ip_conntrack_lock);
1016                 err = -ENOENT;
1017                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1018                         err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
1019                 return err;
1020         }
1021         /* implicit 'else' */
1022
1023         /* we only allow nat config for new conntracks */
1024         if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
1025                 err = -EINVAL;
1026                 goto out_unlock;
1027         }
1028
1029         /* We manipulate the conntrack inside the global conntrack table lock,
1030          * so there's no need to increase the refcount */
1031         err = -EEXIST;
1032         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1033                 err = ctnetlink_change_conntrack(tuplehash_to_ctrack(h), cda);
1034
1035 out_unlock:
1036         write_unlock_bh(&ip_conntrack_lock);
1037         return err;
1038 }
1039
1040 /*********************************************************************** 
1041  * EXPECT 
1042  ***********************************************************************/ 
1043
1044 static inline int
1045 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1046                          const struct ip_conntrack_tuple *tuple,
1047                          enum ctattr_expect type)
1048 {
1049         struct nfattr *nest_parms = NFA_NEST(skb, type);
1050         
1051         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1052                 goto nfattr_failure;
1053
1054         NFA_NEST_END(skb, nest_parms);
1055
1056         return 0;
1057
1058 nfattr_failure:
1059         return -1;
1060 }                       
1061
1062 static inline int
1063 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1064                         const struct ip_conntrack_tuple *tuple,
1065                         const struct ip_conntrack_tuple *mask)
1066 {
1067         int ret;
1068         struct ip_conntrack_protocol *proto;
1069         struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
1070
1071         ret = ctnetlink_dump_tuples_ip(skb, mask);
1072         if (unlikely(ret < 0))
1073                 goto nfattr_failure;
1074
1075         proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
1076         ret = ctnetlink_dump_tuples_proto(skb, mask, proto);
1077         ip_conntrack_proto_put(proto);
1078         if (unlikely(ret < 0))
1079                 goto nfattr_failure;
1080
1081         NFA_NEST_END(skb, nest_parms);
1082
1083         return 0;
1084
1085 nfattr_failure:
1086         return -1;
1087 }
1088
1089 static inline int
1090 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1091                           const struct ip_conntrack_expect *exp)
1092 {
1093         struct ip_conntrack *master = exp->master;
1094         __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1095         __be32 id = htonl(exp->id);
1096
1097         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1098                 goto nfattr_failure;
1099         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1100                 goto nfattr_failure;
1101         if (ctnetlink_exp_dump_tuple(skb,
1102                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1103                                  CTA_EXPECT_MASTER) < 0)
1104                 goto nfattr_failure;
1105         
1106         NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(__be32), &timeout);
1107         NFA_PUT(skb, CTA_EXPECT_ID, sizeof(__be32), &id);
1108
1109         return 0;
1110         
1111 nfattr_failure:
1112         return -1;
1113 }
1114
1115 static int
1116 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1117                     int event, 
1118                     int nowait, 
1119                     const struct ip_conntrack_expect *exp)
1120 {
1121         struct nlmsghdr *nlh;
1122         struct nfgenmsg *nfmsg;
1123         unsigned char *b;
1124
1125         b = skb->tail;
1126
1127         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1128         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1129         nfmsg  = NLMSG_DATA(nlh);
1130
1131         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1132         nfmsg->nfgen_family = AF_INET;
1133         nfmsg->version      = NFNETLINK_V0;
1134         nfmsg->res_id       = 0;
1135
1136         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1137                 goto nfattr_failure;
1138
1139         nlh->nlmsg_len = skb->tail - b;
1140         return skb->len;
1141
1142 nlmsg_failure:
1143 nfattr_failure:
1144         skb_trim(skb, b - skb->data);
1145         return -1;
1146 }
1147
1148 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1149 static int ctnetlink_expect_event(struct notifier_block *this,
1150                                   unsigned long events, void *ptr)
1151 {
1152         struct nlmsghdr *nlh;
1153         struct nfgenmsg *nfmsg;
1154         struct ip_conntrack_expect *exp = (struct ip_conntrack_expect *)ptr;
1155         struct sk_buff *skb;
1156         unsigned int type;
1157         unsigned char *b;
1158         int flags = 0;
1159
1160         if (events & IPEXP_NEW) {
1161                 type = IPCTNL_MSG_EXP_NEW;
1162                 flags = NLM_F_CREATE|NLM_F_EXCL;
1163         } else
1164                 return NOTIFY_DONE;
1165
1166         if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1167                 return NOTIFY_DONE;
1168
1169         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1170         if (!skb)
1171                 return NOTIFY_DONE;
1172
1173         b = skb->tail;
1174
1175         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1176         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1177         nfmsg = NLMSG_DATA(nlh);
1178
1179         nlh->nlmsg_flags    = flags;
1180         nfmsg->nfgen_family = AF_INET;
1181         nfmsg->version      = NFNETLINK_V0;
1182         nfmsg->res_id       = 0;
1183
1184         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1185                 goto nfattr_failure;
1186
1187         nlh->nlmsg_len = skb->tail - b;
1188         nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1189         return NOTIFY_DONE;
1190
1191 nlmsg_failure:
1192 nfattr_failure:
1193         kfree_skb(skb);
1194         return NOTIFY_DONE;
1195 }
1196 #endif
1197
1198 static int
1199 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1200 {
1201         struct ip_conntrack_expect *exp = NULL;
1202         struct list_head *i;
1203         u_int32_t *id = (u_int32_t *) &cb->args[0];
1204
1205         read_lock_bh(&ip_conntrack_lock);
1206         list_for_each_prev(i, &ip_conntrack_expect_list) {
1207                 exp = (struct ip_conntrack_expect *) i;
1208                 if (exp->id <= *id)
1209                         continue;
1210                 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1211                                             cb->nlh->nlmsg_seq,
1212                                             IPCTNL_MSG_EXP_NEW,
1213                                             1, exp) < 0)
1214                         goto out;
1215                 *id = exp->id;
1216         }
1217 out:    
1218         read_unlock_bh(&ip_conntrack_lock);
1219
1220         return skb->len;
1221 }
1222
1223 static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
1224         [CTA_EXPECT_TIMEOUT-1]          = sizeof(__be32),
1225         [CTA_EXPECT_ID-1]               = sizeof(__be32)
1226 };
1227
1228 static int
1229 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb, 
1230                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1231 {
1232         struct ip_conntrack_tuple tuple;
1233         struct ip_conntrack_expect *exp;
1234         struct sk_buff *skb2;
1235         int err = 0;
1236
1237         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1238                 return -EINVAL;
1239
1240         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1241                 struct nfgenmsg *msg = NLMSG_DATA(nlh);
1242                 u32 rlen;
1243
1244                 if (msg->nfgen_family != AF_INET)
1245                         return -EAFNOSUPPORT;
1246
1247                 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
1248                                                 ctnetlink_exp_dump_table,
1249                                                 ctnetlink_done)) != 0)
1250                         return -EINVAL;
1251                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1252                 if (rlen > skb->len)
1253                         rlen = skb->len;
1254                 skb_pull(skb, rlen);
1255                 return 0;
1256         }
1257
1258         if (cda[CTA_EXPECT_MASTER-1])
1259                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER);
1260         else
1261                 return -EINVAL;
1262
1263         if (err < 0)
1264                 return err;
1265
1266         exp = ip_conntrack_expect_find_get(&tuple);
1267         if (!exp)
1268                 return -ENOENT;
1269
1270         if (cda[CTA_EXPECT_ID-1]) {
1271                 __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1272                 if (exp->id != ntohl(id)) {
1273                         ip_conntrack_expect_put(exp);
1274                         return -ENOENT;
1275                 }
1276         }       
1277
1278         err = -ENOMEM;
1279         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1280         if (!skb2)
1281                 goto out;
1282
1283         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid, 
1284                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1285                                       1, exp);
1286         if (err <= 0)
1287                 goto free;
1288
1289         ip_conntrack_expect_put(exp);
1290
1291         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1292
1293 free:
1294         kfree_skb(skb2);
1295 out:
1296         ip_conntrack_expect_put(exp);
1297         return err;
1298 }
1299
1300 static int
1301 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb, 
1302                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1303 {
1304         struct ip_conntrack_expect *exp, *tmp;
1305         struct ip_conntrack_tuple tuple;
1306         struct ip_conntrack_helper *h;
1307         int err;
1308
1309         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1310                 return -EINVAL;
1311
1312         if (cda[CTA_EXPECT_TUPLE-1]) {
1313                 /* delete a single expect by tuple */
1314                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1315                 if (err < 0)
1316                         return err;
1317
1318                 /* bump usage count to 2 */
1319                 exp = ip_conntrack_expect_find_get(&tuple);
1320                 if (!exp)
1321                         return -ENOENT;
1322
1323                 if (cda[CTA_EXPECT_ID-1]) {
1324                         __be32 id =
1325                                 *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1326                         if (exp->id != ntohl(id)) {
1327                                 ip_conntrack_expect_put(exp);
1328                                 return -ENOENT;
1329                         }
1330                 }
1331
1332                 /* after list removal, usage count == 1 */
1333                 ip_conntrack_unexpect_related(exp);
1334                 /* have to put what we 'get' above. 
1335                  * after this line usage count == 0 */
1336                 ip_conntrack_expect_put(exp);
1337         } else if (cda[CTA_EXPECT_HELP_NAME-1]) {
1338                 char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
1339
1340                 /* delete all expectations for this helper */
1341                 write_lock_bh(&ip_conntrack_lock);
1342                 h = __ip_conntrack_helper_find_byname(name);
1343                 if (!h) {
1344                         write_unlock_bh(&ip_conntrack_lock);
1345                         return -EINVAL;
1346                 }
1347                 list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
1348                                          list) {
1349                         if (exp->master->helper == h 
1350                             && del_timer(&exp->timeout)) {
1351                                 ip_ct_unlink_expect(exp);
1352                                 ip_conntrack_expect_put(exp);
1353                         }
1354                 }
1355                 write_unlock_bh(&ip_conntrack_lock);
1356         } else {
1357                 /* This basically means we have to flush everything*/
1358                 write_lock_bh(&ip_conntrack_lock);
1359                 list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
1360                                          list) {
1361                         if (del_timer(&exp->timeout)) {
1362                                 ip_ct_unlink_expect(exp);
1363                                 ip_conntrack_expect_put(exp);
1364                         }
1365                 }
1366                 write_unlock_bh(&ip_conntrack_lock);
1367         }
1368
1369         return 0;
1370 }
1371 static int
1372 ctnetlink_change_expect(struct ip_conntrack_expect *x, struct nfattr *cda[])
1373 {
1374         return -EOPNOTSUPP;
1375 }
1376
1377 static int
1378 ctnetlink_create_expect(struct nfattr *cda[])
1379 {
1380         struct ip_conntrack_tuple tuple, mask, master_tuple;
1381         struct ip_conntrack_tuple_hash *h = NULL;
1382         struct ip_conntrack_expect *exp;
1383         struct ip_conntrack *ct;
1384         int err = 0;
1385
1386         /* caller guarantees that those three CTA_EXPECT_* exist */
1387         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1388         if (err < 0)
1389                 return err;
1390         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK);
1391         if (err < 0)
1392                 return err;
1393         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER);
1394         if (err < 0)
1395                 return err;
1396
1397         /* Look for master conntrack of this expectation */
1398         h = ip_conntrack_find_get(&master_tuple, NULL);
1399         if (!h)
1400                 return -ENOENT;
1401         ct = tuplehash_to_ctrack(h);
1402
1403         if (!ct->helper) {
1404                 /* such conntrack hasn't got any helper, abort */
1405                 err = -EINVAL;
1406                 goto out;
1407         }
1408
1409         exp = ip_conntrack_expect_alloc(ct);
1410         if (!exp) {
1411                 err = -ENOMEM;
1412                 goto out;
1413         }
1414         
1415         exp->expectfn = NULL;
1416         exp->flags = 0;
1417         exp->master = ct;
1418         memcpy(&exp->tuple, &tuple, sizeof(struct ip_conntrack_tuple));
1419         memcpy(&exp->mask, &mask, sizeof(struct ip_conntrack_tuple));
1420
1421         err = ip_conntrack_expect_related(exp);
1422         ip_conntrack_expect_put(exp);
1423
1424 out:    
1425         ip_conntrack_put(tuplehash_to_ctrack(h));
1426         return err;
1427 }
1428
1429 static int
1430 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1431                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1432 {
1433         struct ip_conntrack_tuple tuple;
1434         struct ip_conntrack_expect *exp;
1435         int err = 0;
1436
1437         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1438                 return -EINVAL;
1439
1440         if (!cda[CTA_EXPECT_TUPLE-1]
1441             || !cda[CTA_EXPECT_MASK-1]
1442             || !cda[CTA_EXPECT_MASTER-1])
1443                 return -EINVAL;
1444
1445         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1446         if (err < 0)
1447                 return err;
1448
1449         write_lock_bh(&ip_conntrack_lock);
1450         exp = __ip_conntrack_expect_find(&tuple);
1451
1452         if (!exp) {
1453                 write_unlock_bh(&ip_conntrack_lock);
1454                 err = -ENOENT;
1455                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1456                         err = ctnetlink_create_expect(cda);
1457                 return err;
1458         }
1459
1460         err = -EEXIST;
1461         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1462                 err = ctnetlink_change_expect(exp, cda);
1463         write_unlock_bh(&ip_conntrack_lock);
1464
1465         return err;
1466 }
1467
1468 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1469 static struct notifier_block ctnl_notifier = {
1470         .notifier_call  = ctnetlink_conntrack_event,
1471 };
1472
1473 static struct notifier_block ctnl_notifier_exp = {
1474         .notifier_call  = ctnetlink_expect_event,
1475 };
1476 #endif
1477
1478 static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1479         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1480                                             .attr_count = CTA_MAX, },
1481         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1482                                             .attr_count = CTA_MAX, },
1483         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1484                                             .attr_count = CTA_MAX, },
1485         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1486                                             .attr_count = CTA_MAX, },
1487 };
1488
1489 static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1490         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1491                                             .attr_count = CTA_EXPECT_MAX, },
1492         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1493                                             .attr_count = CTA_EXPECT_MAX, },
1494         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1495                                             .attr_count = CTA_EXPECT_MAX, },
1496 };
1497
1498 static struct nfnetlink_subsystem ctnl_subsys = {
1499         .name                           = "conntrack",
1500         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1501         .cb_count                       = IPCTNL_MSG_MAX,
1502         .cb                             = ctnl_cb,
1503 };
1504
1505 static struct nfnetlink_subsystem ctnl_exp_subsys = {
1506         .name                           = "conntrack_expect",
1507         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1508         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1509         .cb                             = ctnl_exp_cb,
1510 };
1511
1512 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1513 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1514
1515 static int __init ctnetlink_init(void)
1516 {
1517         int ret;
1518
1519         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1520         ret = nfnetlink_subsys_register(&ctnl_subsys);
1521         if (ret < 0) {
1522                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1523                 goto err_out;
1524         }
1525
1526         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1527         if (ret < 0) {
1528                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1529                 goto err_unreg_subsys;
1530         }
1531
1532 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1533         ret = ip_conntrack_register_notifier(&ctnl_notifier);
1534         if (ret < 0) {
1535                 printk("ctnetlink_init: cannot register notifier.\n");
1536                 goto err_unreg_exp_subsys;
1537         }
1538
1539         ret = ip_conntrack_expect_register_notifier(&ctnl_notifier_exp);
1540         if (ret < 0) {
1541                 printk("ctnetlink_init: cannot expect register notifier.\n");
1542                 goto err_unreg_notifier;
1543         }
1544 #endif
1545
1546         return 0;
1547
1548 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1549 err_unreg_notifier:
1550         ip_conntrack_unregister_notifier(&ctnl_notifier);
1551 err_unreg_exp_subsys:
1552         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1553 #endif
1554 err_unreg_subsys:
1555         nfnetlink_subsys_unregister(&ctnl_subsys);
1556 err_out:
1557         return ret;
1558 }
1559
1560 static void __exit ctnetlink_exit(void)
1561 {
1562         printk("ctnetlink: unregistering from nfnetlink.\n");
1563
1564 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1565         ip_conntrack_expect_unregister_notifier(&ctnl_notifier_exp);
1566         ip_conntrack_unregister_notifier(&ctnl_notifier);
1567 #endif
1568
1569         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1570         nfnetlink_subsys_unregister(&ctnl_subsys);
1571         return;
1572 }
1573
1574 module_init(ctnetlink_init);
1575 module_exit(ctnetlink_exit);