[NETLINK]: Remove unused dst_pid field in netlink_skb_parms
[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                 /* dump everything */
324                 events = ~0UL;
325                 group = NFNLGRP_CONNTRACK_NEW;
326         } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
327                 type = IPCTNL_MSG_CT_NEW;
328                 group = NFNLGRP_CONNTRACK_UPDATE;
329         } else 
330                 return NOTIFY_DONE;
331
332         if (!nfnetlink_has_listeners(group))
333                 return NOTIFY_DONE;
334
335         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
336         if (!skb)
337                 return NOTIFY_DONE;
338
339         b = skb->tail;
340
341         type |= NFNL_SUBSYS_CTNETLINK << 8;
342         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
343         nfmsg = NLMSG_DATA(nlh);
344
345         nlh->nlmsg_flags    = flags;
346         nfmsg->nfgen_family = AF_INET;
347         nfmsg->version  = NFNETLINK_V0;
348         nfmsg->res_id   = 0;
349
350         nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
351         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
352                 goto nfattr_failure;
353         NFA_NEST_END(skb, nest_parms);
354         
355         nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
356         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
357                 goto nfattr_failure;
358         NFA_NEST_END(skb, nest_parms);
359         
360         /* NAT stuff is now a status flag */
361         if ((events & IPCT_STATUS || events & IPCT_NATINFO)
362             && ctnetlink_dump_status(skb, ct) < 0)
363                 goto nfattr_failure;
364         if (events & IPCT_REFRESH
365             && ctnetlink_dump_timeout(skb, ct) < 0)
366                 goto nfattr_failure;
367         if (events & IPCT_PROTOINFO
368             && ctnetlink_dump_protoinfo(skb, ct) < 0)
369                 goto nfattr_failure;
370         if (events & IPCT_HELPINFO
371             && ctnetlink_dump_helpinfo(skb, ct) < 0)
372                 goto nfattr_failure;
373
374         if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
375             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
376                 goto nfattr_failure;
377
378         if (events & IPCT_MARK
379             && ctnetlink_dump_mark(skb, ct) < 0)
380                 goto nfattr_failure;
381
382         nlh->nlmsg_len = skb->tail - b;
383         nfnetlink_send(skb, 0, group, 0);
384         return NOTIFY_DONE;
385
386 nlmsg_failure:
387 nfattr_failure:
388         kfree_skb(skb);
389         return NOTIFY_DONE;
390 }
391 #endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
392
393 static int ctnetlink_done(struct netlink_callback *cb)
394 {
395         if (cb->args[1])
396                 ip_conntrack_put((struct ip_conntrack *)cb->args[1]);
397         return 0;
398 }
399
400 static int
401 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
402 {
403         struct ip_conntrack *ct, *last;
404         struct ip_conntrack_tuple_hash *h;
405         struct list_head *i;
406
407         read_lock_bh(&ip_conntrack_lock);
408         last = (struct ip_conntrack *)cb->args[1];
409         for (; cb->args[0] < ip_conntrack_htable_size; cb->args[0]++) {
410 restart:
411                 list_for_each_prev(i, &ip_conntrack_hash[cb->args[0]]) {
412                         h = (struct ip_conntrack_tuple_hash *) i;
413                         if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
414                                 continue;
415                         ct = tuplehash_to_ctrack(h);
416                         if (cb->args[1]) {
417                                 if (ct != last)
418                                         continue;
419                                 cb->args[1] = 0;
420                         }
421                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
422                                                 cb->nlh->nlmsg_seq,
423                                                 IPCTNL_MSG_CT_NEW,
424                                                 1, ct) < 0) {
425                                 nf_conntrack_get(&ct->ct_general);
426                                 cb->args[1] = (unsigned long)ct;
427                                 goto out;
428                         }
429 #ifdef CONFIG_NF_CT_ACCT
430                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
431                                                 IPCTNL_MSG_CT_GET_CTRZERO)
432                                 memset(&ct->counters, 0, sizeof(ct->counters));
433 #endif
434                 }
435                 if (cb->args[1]) {
436                         cb->args[1] = 0;
437                         goto restart;
438                 }
439         }
440 out:
441         read_unlock_bh(&ip_conntrack_lock);
442         if (last)
443                 ip_conntrack_put(last);
444
445         return skb->len;
446 }
447
448 static const size_t cta_min_ip[CTA_IP_MAX] = {
449         [CTA_IP_V4_SRC-1]       = sizeof(__be32),
450         [CTA_IP_V4_DST-1]       = sizeof(__be32),
451 };
452
453 static inline int
454 ctnetlink_parse_tuple_ip(struct nfattr *attr, struct ip_conntrack_tuple *tuple)
455 {
456         struct nfattr *tb[CTA_IP_MAX];
457
458         nfattr_parse_nested(tb, CTA_IP_MAX, attr);
459
460         if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip))
461                 return -EINVAL;
462
463         if (!tb[CTA_IP_V4_SRC-1])
464                 return -EINVAL;
465         tuple->src.ip = *(__be32 *)NFA_DATA(tb[CTA_IP_V4_SRC-1]);
466
467         if (!tb[CTA_IP_V4_DST-1])
468                 return -EINVAL;
469         tuple->dst.ip = *(__be32 *)NFA_DATA(tb[CTA_IP_V4_DST-1]);
470
471         return 0;
472 }
473
474 static const size_t cta_min_proto[CTA_PROTO_MAX] = {
475         [CTA_PROTO_NUM-1]       = sizeof(u_int8_t),
476         [CTA_PROTO_SRC_PORT-1]  = sizeof(u_int16_t),
477         [CTA_PROTO_DST_PORT-1]  = sizeof(u_int16_t),
478         [CTA_PROTO_ICMP_TYPE-1] = sizeof(u_int8_t),
479         [CTA_PROTO_ICMP_CODE-1] = sizeof(u_int8_t),
480         [CTA_PROTO_ICMP_ID-1]   = sizeof(u_int16_t),
481 };
482
483 static inline int
484 ctnetlink_parse_tuple_proto(struct nfattr *attr, 
485                             struct ip_conntrack_tuple *tuple)
486 {
487         struct nfattr *tb[CTA_PROTO_MAX];
488         struct ip_conntrack_protocol *proto;
489         int ret = 0;
490
491         nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
492
493         if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
494                 return -EINVAL;
495
496         if (!tb[CTA_PROTO_NUM-1])
497                 return -EINVAL;
498         tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
499
500         proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
501
502         if (likely(proto->nfattr_to_tuple))
503                 ret = proto->nfattr_to_tuple(tb, tuple);
504         
505         ip_conntrack_proto_put(proto);
506         
507         return ret;
508 }
509
510 static inline int
511 ctnetlink_parse_tuple(struct nfattr *cda[], struct ip_conntrack_tuple *tuple,
512                       enum ctattr_tuple type)
513 {
514         struct nfattr *tb[CTA_TUPLE_MAX];
515         int err;
516
517         memset(tuple, 0, sizeof(*tuple));
518
519         nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
520
521         if (!tb[CTA_TUPLE_IP-1])
522                 return -EINVAL;
523
524         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
525         if (err < 0)
526                 return err;
527
528         if (!tb[CTA_TUPLE_PROTO-1])
529                 return -EINVAL;
530
531         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
532         if (err < 0)
533                 return err;
534
535         /* orig and expect tuples get DIR_ORIGINAL */
536         if (type == CTA_TUPLE_REPLY)
537                 tuple->dst.dir = IP_CT_DIR_REPLY;
538         else
539                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
540
541         return 0;
542 }
543
544 #ifdef CONFIG_IP_NF_NAT_NEEDED
545 static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
546         [CTA_PROTONAT_PORT_MIN-1]       = sizeof(u_int16_t),
547         [CTA_PROTONAT_PORT_MAX-1]       = sizeof(u_int16_t),
548 };
549
550 static int ctnetlink_parse_nat_proto(struct nfattr *attr,
551                                      const struct ip_conntrack *ct,
552                                      struct ip_nat_range *range)
553 {
554         struct nfattr *tb[CTA_PROTONAT_MAX];
555         struct ip_nat_protocol *npt;
556
557         nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
558
559         if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
560                 return -EINVAL;
561
562         npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
563
564         if (!npt->nfattr_to_range) {
565                 ip_nat_proto_put(npt);
566                 return 0;
567         }
568
569         /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
570         if (npt->nfattr_to_range(tb, range) > 0)
571                 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
572
573         ip_nat_proto_put(npt);
574
575         return 0;
576 }
577
578 static const size_t cta_min_nat[CTA_NAT_MAX] = {
579         [CTA_NAT_MINIP-1]       = sizeof(__be32),
580         [CTA_NAT_MAXIP-1]       = sizeof(__be32),
581 };
582
583 static inline int
584 ctnetlink_parse_nat(struct nfattr *nat,
585                     const struct ip_conntrack *ct, struct ip_nat_range *range)
586 {
587         struct nfattr *tb[CTA_NAT_MAX];
588         int err;
589
590         memset(range, 0, sizeof(*range));
591         
592         nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
593
594         if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
595                 return -EINVAL;
596
597         if (tb[CTA_NAT_MINIP-1])
598                 range->min_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
599
600         if (!tb[CTA_NAT_MAXIP-1])
601                 range->max_ip = range->min_ip;
602         else
603                 range->max_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
604
605         if (range->min_ip)
606                 range->flags |= IP_NAT_RANGE_MAP_IPS;
607
608         if (!tb[CTA_NAT_PROTO-1])
609                 return 0;
610
611         err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
612         if (err < 0)
613                 return err;
614
615         return 0;
616 }
617 #endif
618
619 static inline int
620 ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
621 {
622         struct nfattr *tb[CTA_HELP_MAX];
623
624         nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
625
626         if (!tb[CTA_HELP_NAME-1])
627                 return -EINVAL;
628
629         *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
630
631         return 0;
632 }
633
634 static const size_t cta_min[CTA_MAX] = {
635         [CTA_STATUS-1]          = sizeof(__be32),
636         [CTA_TIMEOUT-1]         = sizeof(__be32),
637         [CTA_MARK-1]            = sizeof(__be32),
638         [CTA_USE-1]             = sizeof(__be32),
639         [CTA_ID-1]              = sizeof(__be32)
640 };
641
642 static int
643 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb, 
644                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
645 {
646         struct ip_conntrack_tuple_hash *h;
647         struct ip_conntrack_tuple tuple;
648         struct ip_conntrack *ct;
649         int err = 0;
650
651         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
652                 return -EINVAL;
653
654         if (cda[CTA_TUPLE_ORIG-1])
655                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
656         else if (cda[CTA_TUPLE_REPLY-1])
657                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
658         else {
659                 /* Flush the whole table */
660                 ip_conntrack_flush();
661                 return 0;
662         }
663
664         if (err < 0)
665                 return err;
666
667         h = ip_conntrack_find_get(&tuple, NULL);
668         if (!h)
669                 return -ENOENT;
670
671         ct = tuplehash_to_ctrack(h);
672         
673         if (cda[CTA_ID-1]) {
674                 u_int32_t id = ntohl(*(__be32 *)NFA_DATA(cda[CTA_ID-1]));
675                 if (ct->id != id) {
676                         ip_conntrack_put(ct);
677                         return -ENOENT;
678                 }
679         }       
680         if (del_timer(&ct->timeout))
681                 ct->timeout.function((unsigned long)ct);
682
683         ip_conntrack_put(ct);
684
685         return 0;
686 }
687
688 static int
689 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb, 
690                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
691 {
692         struct ip_conntrack_tuple_hash *h;
693         struct ip_conntrack_tuple tuple;
694         struct ip_conntrack *ct;
695         struct sk_buff *skb2 = NULL;
696         int err = 0;
697
698         if (nlh->nlmsg_flags & NLM_F_DUMP) {
699                 struct nfgenmsg *msg = NLMSG_DATA(nlh);
700                 u32 rlen;
701
702                 if (msg->nfgen_family != AF_INET)
703                         return -EAFNOSUPPORT;
704
705 #ifndef CONFIG_IP_NF_CT_ACCT
706                 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
707                         return -ENOTSUPP;
708 #endif
709                 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
710                                                 ctnetlink_dump_table,
711                                                 ctnetlink_done)) != 0)
712                         return -EINVAL;
713
714                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
715                 if (rlen > skb->len)
716                         rlen = skb->len;
717                 skb_pull(skb, rlen);
718                 return 0;
719         }
720
721         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
722                 return -EINVAL;
723
724         if (cda[CTA_TUPLE_ORIG-1])
725                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
726         else if (cda[CTA_TUPLE_REPLY-1])
727                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
728         else
729                 return -EINVAL;
730
731         if (err < 0)
732                 return err;
733
734         h = ip_conntrack_find_get(&tuple, NULL);
735         if (!h)
736                 return -ENOENT;
737
738         ct = tuplehash_to_ctrack(h);
739
740         err = -ENOMEM;
741         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
742         if (!skb2) {
743                 ip_conntrack_put(ct);
744                 return -ENOMEM;
745         }
746
747         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 
748                                   IPCTNL_MSG_CT_NEW, 1, ct);
749         ip_conntrack_put(ct);
750         if (err <= 0)
751                 goto free;
752
753         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
754         if (err < 0)
755                 goto out;
756
757         return 0;
758
759 free:
760         kfree_skb(skb2);
761 out:
762         return err;
763 }
764
765 static inline int
766 ctnetlink_change_status(struct ip_conntrack *ct, struct nfattr *cda[])
767 {
768         unsigned long d;
769         unsigned status = ntohl(*(__be32 *)NFA_DATA(cda[CTA_STATUS-1]));
770         d = ct->status ^ status;
771
772         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
773                 /* unchangeable */
774                 return -EINVAL;
775         
776         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
777                 /* SEEN_REPLY bit can only be set */
778                 return -EINVAL;
779
780         
781         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
782                 /* ASSURED bit can only be set */
783                 return -EINVAL;
784
785         if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
786 #ifndef CONFIG_IP_NF_NAT_NEEDED
787                 return -EINVAL;
788 #else
789                 struct ip_nat_range range;
790
791                 if (cda[CTA_NAT_DST-1]) {
792                         if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
793                                                 &range) < 0)
794                                 return -EINVAL;
795                         if (ip_nat_initialized(ct,
796                                                HOOK2MANIP(NF_IP_PRE_ROUTING)))
797                                 return -EEXIST;
798                         ip_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
799                 }
800                 if (cda[CTA_NAT_SRC-1]) {
801                         if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
802                                                 &range) < 0)
803                                 return -EINVAL;
804                         if (ip_nat_initialized(ct,
805                                                HOOK2MANIP(NF_IP_POST_ROUTING)))
806                                 return -EEXIST;
807                         ip_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
808                 }
809 #endif
810         }
811
812         /* Be careful here, modifying NAT bits can screw up things,
813          * so don't let users modify them directly if they don't pass
814          * ip_nat_range. */
815         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
816         return 0;
817 }
818
819
820 static inline int
821 ctnetlink_change_helper(struct ip_conntrack *ct, struct nfattr *cda[])
822 {
823         struct ip_conntrack_helper *helper;
824         char *helpname;
825         int err;
826
827         /* don't change helper of sibling connections */
828         if (ct->master)
829                 return -EINVAL;
830
831         err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
832         if (err < 0)
833                 return err;
834
835         helper = __ip_conntrack_helper_find_byname(helpname);
836         if (!helper) {
837                 if (!strcmp(helpname, ""))
838                         helper = NULL;
839                 else
840                         return -EINVAL;
841         }
842
843         if (ct->helper) {
844                 if (!helper) {
845                         /* we had a helper before ... */
846                         ip_ct_remove_expectations(ct);
847                         ct->helper = NULL;
848                 } else {
849                         /* need to zero data of old helper */
850                         memset(&ct->help, 0, sizeof(ct->help));
851                 }
852         }
853         
854         ct->helper = helper;
855
856         return 0;
857 }
858
859 static inline int
860 ctnetlink_change_timeout(struct ip_conntrack *ct, struct nfattr *cda[])
861 {
862         u_int32_t timeout = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
863         
864         if (!del_timer(&ct->timeout))
865                 return -ETIME;
866
867         ct->timeout.expires = jiffies + timeout * HZ;
868         add_timer(&ct->timeout);
869
870         return 0;
871 }
872
873 static inline int
874 ctnetlink_change_protoinfo(struct ip_conntrack *ct, struct nfattr *cda[])
875 {
876         struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
877         struct ip_conntrack_protocol *proto;
878         u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
879         int err = 0;
880
881         nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
882
883         proto = ip_conntrack_proto_find_get(npt);
884
885         if (proto->from_nfattr)
886                 err = proto->from_nfattr(tb, ct);
887         ip_conntrack_proto_put(proto); 
888
889         return err;
890 }
891
892 static int
893 ctnetlink_change_conntrack(struct ip_conntrack *ct, struct nfattr *cda[])
894 {
895         int err;
896
897         if (cda[CTA_HELP-1]) {
898                 err = ctnetlink_change_helper(ct, cda);
899                 if (err < 0)
900                         return err;
901         }
902
903         if (cda[CTA_TIMEOUT-1]) {
904                 err = ctnetlink_change_timeout(ct, cda);
905                 if (err < 0)
906                         return err;
907         }
908
909         if (cda[CTA_STATUS-1]) {
910                 err = ctnetlink_change_status(ct, cda);
911                 if (err < 0)
912                         return err;
913         }
914
915         if (cda[CTA_PROTOINFO-1]) {
916                 err = ctnetlink_change_protoinfo(ct, cda);
917                 if (err < 0)
918                         return err;
919         }
920
921 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
922         if (cda[CTA_MARK-1])
923                 ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
924 #endif
925
926         return 0;
927 }
928
929 static int
930 ctnetlink_create_conntrack(struct nfattr *cda[], 
931                            struct ip_conntrack_tuple *otuple,
932                            struct ip_conntrack_tuple *rtuple)
933 {
934         struct ip_conntrack *ct;
935         int err = -EINVAL;
936
937         ct = ip_conntrack_alloc(otuple, rtuple);
938         if (ct == NULL || IS_ERR(ct))
939                 return -ENOMEM; 
940
941         if (!cda[CTA_TIMEOUT-1])
942                 goto err;
943         ct->timeout.expires = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
944
945         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
946         ct->status |= IPS_CONFIRMED;
947
948         err = ctnetlink_change_status(ct, cda);
949         if (err < 0)
950                 goto err;
951
952         if (cda[CTA_PROTOINFO-1]) {
953                 err = ctnetlink_change_protoinfo(ct, cda);
954                 if (err < 0)
955                         return err;
956         }
957
958 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
959         if (cda[CTA_MARK-1])
960                 ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
961 #endif
962
963         ct->helper = ip_conntrack_helper_find_get(rtuple);
964
965         add_timer(&ct->timeout);
966         ip_conntrack_hash_insert(ct);
967
968         if (ct->helper)
969                 ip_conntrack_helper_put(ct->helper);
970
971         return 0;
972
973 err:    
974         ip_conntrack_free(ct);
975         return err;
976 }
977
978 static int 
979 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb, 
980                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
981 {
982         struct ip_conntrack_tuple otuple, rtuple;
983         struct ip_conntrack_tuple_hash *h = NULL;
984         int err = 0;
985
986         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
987                 return -EINVAL;
988
989         if (cda[CTA_TUPLE_ORIG-1]) {
990                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG);
991                 if (err < 0)
992                         return err;
993         }
994
995         if (cda[CTA_TUPLE_REPLY-1]) {
996                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY);
997                 if (err < 0)
998                         return err;
999         }
1000
1001         write_lock_bh(&ip_conntrack_lock);
1002         if (cda[CTA_TUPLE_ORIG-1])
1003                 h = __ip_conntrack_find(&otuple, NULL);
1004         else if (cda[CTA_TUPLE_REPLY-1])
1005                 h = __ip_conntrack_find(&rtuple, NULL);
1006
1007         if (h == NULL) {
1008                 write_unlock_bh(&ip_conntrack_lock);
1009                 err = -ENOENT;
1010                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1011                         err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
1012                 return err;
1013         }
1014         /* implicit 'else' */
1015
1016         /* we only allow nat config for new conntracks */
1017         if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
1018                 err = -EINVAL;
1019                 goto out_unlock;
1020         }
1021
1022         /* We manipulate the conntrack inside the global conntrack table lock,
1023          * so there's no need to increase the refcount */
1024         err = -EEXIST;
1025         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1026                 err = ctnetlink_change_conntrack(tuplehash_to_ctrack(h), cda);
1027
1028 out_unlock:
1029         write_unlock_bh(&ip_conntrack_lock);
1030         return err;
1031 }
1032
1033 /*********************************************************************** 
1034  * EXPECT 
1035  ***********************************************************************/ 
1036
1037 static inline int
1038 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1039                          const struct ip_conntrack_tuple *tuple,
1040                          enum ctattr_expect type)
1041 {
1042         struct nfattr *nest_parms = NFA_NEST(skb, type);
1043         
1044         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1045                 goto nfattr_failure;
1046
1047         NFA_NEST_END(skb, nest_parms);
1048
1049         return 0;
1050
1051 nfattr_failure:
1052         return -1;
1053 }                       
1054
1055 static inline int
1056 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1057                         const struct ip_conntrack_tuple *tuple,
1058                         const struct ip_conntrack_tuple *mask)
1059 {
1060         int ret;
1061         struct ip_conntrack_protocol *proto;
1062         struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
1063
1064         ret = ctnetlink_dump_tuples_ip(skb, mask);
1065         if (unlikely(ret < 0))
1066                 goto nfattr_failure;
1067
1068         proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
1069         ret = ctnetlink_dump_tuples_proto(skb, mask, proto);
1070         ip_conntrack_proto_put(proto);
1071         if (unlikely(ret < 0))
1072                 goto nfattr_failure;
1073
1074         NFA_NEST_END(skb, nest_parms);
1075
1076         return 0;
1077
1078 nfattr_failure:
1079         return -1;
1080 }
1081
1082 static inline int
1083 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1084                           const struct ip_conntrack_expect *exp)
1085 {
1086         struct ip_conntrack *master = exp->master;
1087         __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1088         __be32 id = htonl(exp->id);
1089
1090         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1091                 goto nfattr_failure;
1092         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1093                 goto nfattr_failure;
1094         if (ctnetlink_exp_dump_tuple(skb,
1095                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1096                                  CTA_EXPECT_MASTER) < 0)
1097                 goto nfattr_failure;
1098         
1099         NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(__be32), &timeout);
1100         NFA_PUT(skb, CTA_EXPECT_ID, sizeof(__be32), &id);
1101
1102         return 0;
1103         
1104 nfattr_failure:
1105         return -1;
1106 }
1107
1108 static int
1109 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1110                     int event, 
1111                     int nowait, 
1112                     const struct ip_conntrack_expect *exp)
1113 {
1114         struct nlmsghdr *nlh;
1115         struct nfgenmsg *nfmsg;
1116         unsigned char *b;
1117
1118         b = skb->tail;
1119
1120         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1121         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1122         nfmsg  = NLMSG_DATA(nlh);
1123
1124         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1125         nfmsg->nfgen_family = AF_INET;
1126         nfmsg->version      = NFNETLINK_V0;
1127         nfmsg->res_id       = 0;
1128
1129         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1130                 goto nfattr_failure;
1131
1132         nlh->nlmsg_len = skb->tail - b;
1133         return skb->len;
1134
1135 nlmsg_failure:
1136 nfattr_failure:
1137         skb_trim(skb, b - skb->data);
1138         return -1;
1139 }
1140
1141 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1142 static int ctnetlink_expect_event(struct notifier_block *this,
1143                                   unsigned long events, void *ptr)
1144 {
1145         struct nlmsghdr *nlh;
1146         struct nfgenmsg *nfmsg;
1147         struct ip_conntrack_expect *exp = (struct ip_conntrack_expect *)ptr;
1148         struct sk_buff *skb;
1149         unsigned int type;
1150         unsigned char *b;
1151         int flags = 0;
1152
1153         if (events & IPEXP_NEW) {
1154                 type = IPCTNL_MSG_EXP_NEW;
1155                 flags = NLM_F_CREATE|NLM_F_EXCL;
1156         } else
1157                 return NOTIFY_DONE;
1158
1159         if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1160                 return NOTIFY_DONE;
1161
1162         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1163         if (!skb)
1164                 return NOTIFY_DONE;
1165
1166         b = skb->tail;
1167
1168         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1169         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1170         nfmsg = NLMSG_DATA(nlh);
1171
1172         nlh->nlmsg_flags    = flags;
1173         nfmsg->nfgen_family = AF_INET;
1174         nfmsg->version      = NFNETLINK_V0;
1175         nfmsg->res_id       = 0;
1176
1177         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1178                 goto nfattr_failure;
1179
1180         nlh->nlmsg_len = skb->tail - b;
1181         nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1182         return NOTIFY_DONE;
1183
1184 nlmsg_failure:
1185 nfattr_failure:
1186         kfree_skb(skb);
1187         return NOTIFY_DONE;
1188 }
1189 #endif
1190
1191 static int
1192 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1193 {
1194         struct ip_conntrack_expect *exp = NULL;
1195         struct list_head *i;
1196         u_int32_t *id = (u_int32_t *) &cb->args[0];
1197
1198         read_lock_bh(&ip_conntrack_lock);
1199         list_for_each_prev(i, &ip_conntrack_expect_list) {
1200                 exp = (struct ip_conntrack_expect *) i;
1201                 if (exp->id <= *id)
1202                         continue;
1203                 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1204                                             cb->nlh->nlmsg_seq,
1205                                             IPCTNL_MSG_EXP_NEW,
1206                                             1, exp) < 0)
1207                         goto out;
1208                 *id = exp->id;
1209         }
1210 out:    
1211         read_unlock_bh(&ip_conntrack_lock);
1212
1213         return skb->len;
1214 }
1215
1216 static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
1217         [CTA_EXPECT_TIMEOUT-1]          = sizeof(__be32),
1218         [CTA_EXPECT_ID-1]               = sizeof(__be32)
1219 };
1220
1221 static int
1222 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb, 
1223                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1224 {
1225         struct ip_conntrack_tuple tuple;
1226         struct ip_conntrack_expect *exp;
1227         struct sk_buff *skb2;
1228         int err = 0;
1229
1230         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1231                 return -EINVAL;
1232
1233         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1234                 struct nfgenmsg *msg = NLMSG_DATA(nlh);
1235                 u32 rlen;
1236
1237                 if (msg->nfgen_family != AF_INET)
1238                         return -EAFNOSUPPORT;
1239
1240                 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
1241                                                 ctnetlink_exp_dump_table,
1242                                                 ctnetlink_done)) != 0)
1243                         return -EINVAL;
1244                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1245                 if (rlen > skb->len)
1246                         rlen = skb->len;
1247                 skb_pull(skb, rlen);
1248                 return 0;
1249         }
1250
1251         if (cda[CTA_EXPECT_MASTER-1])
1252                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER);
1253         else
1254                 return -EINVAL;
1255
1256         if (err < 0)
1257                 return err;
1258
1259         exp = ip_conntrack_expect_find(&tuple);
1260         if (!exp)
1261                 return -ENOENT;
1262
1263         if (cda[CTA_EXPECT_ID-1]) {
1264                 __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1265                 if (exp->id != ntohl(id)) {
1266                         ip_conntrack_expect_put(exp);
1267                         return -ENOENT;
1268                 }
1269         }       
1270
1271         err = -ENOMEM;
1272         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1273         if (!skb2)
1274                 goto out;
1275
1276         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid, 
1277                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1278                                       1, exp);
1279         if (err <= 0)
1280                 goto free;
1281
1282         ip_conntrack_expect_put(exp);
1283
1284         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1285
1286 free:
1287         kfree_skb(skb2);
1288 out:
1289         ip_conntrack_expect_put(exp);
1290         return err;
1291 }
1292
1293 static int
1294 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb, 
1295                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1296 {
1297         struct ip_conntrack_expect *exp, *tmp;
1298         struct ip_conntrack_tuple tuple;
1299         struct ip_conntrack_helper *h;
1300         int err;
1301
1302         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1303                 return -EINVAL;
1304
1305         if (cda[CTA_EXPECT_TUPLE-1]) {
1306                 /* delete a single expect by tuple */
1307                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1308                 if (err < 0)
1309                         return err;
1310
1311                 /* bump usage count to 2 */
1312                 exp = ip_conntrack_expect_find(&tuple);
1313                 if (!exp)
1314                         return -ENOENT;
1315
1316                 if (cda[CTA_EXPECT_ID-1]) {
1317                         __be32 id =
1318                                 *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1319                         if (exp->id != ntohl(id)) {
1320                                 ip_conntrack_expect_put(exp);
1321                                 return -ENOENT;
1322                         }
1323                 }
1324
1325                 /* after list removal, usage count == 1 */
1326                 ip_conntrack_unexpect_related(exp);
1327                 /* have to put what we 'get' above. 
1328                  * after this line usage count == 0 */
1329                 ip_conntrack_expect_put(exp);
1330         } else if (cda[CTA_EXPECT_HELP_NAME-1]) {
1331                 char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
1332
1333                 /* delete all expectations for this helper */
1334                 write_lock_bh(&ip_conntrack_lock);
1335                 h = __ip_conntrack_helper_find_byname(name);
1336                 if (!h) {
1337                         write_unlock_bh(&ip_conntrack_lock);
1338                         return -EINVAL;
1339                 }
1340                 list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
1341                                          list) {
1342                         if (exp->master->helper == h 
1343                             && del_timer(&exp->timeout)) {
1344                                 ip_ct_unlink_expect(exp);
1345                                 ip_conntrack_expect_put(exp);
1346                         }
1347                 }
1348                 write_unlock_bh(&ip_conntrack_lock);
1349         } else {
1350                 /* This basically means we have to flush everything*/
1351                 write_lock_bh(&ip_conntrack_lock);
1352                 list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
1353                                          list) {
1354                         if (del_timer(&exp->timeout)) {
1355                                 ip_ct_unlink_expect(exp);
1356                                 ip_conntrack_expect_put(exp);
1357                         }
1358                 }
1359                 write_unlock_bh(&ip_conntrack_lock);
1360         }
1361
1362         return 0;
1363 }
1364 static int
1365 ctnetlink_change_expect(struct ip_conntrack_expect *x, struct nfattr *cda[])
1366 {
1367         return -EOPNOTSUPP;
1368 }
1369
1370 static int
1371 ctnetlink_create_expect(struct nfattr *cda[])
1372 {
1373         struct ip_conntrack_tuple tuple, mask, master_tuple;
1374         struct ip_conntrack_tuple_hash *h = NULL;
1375         struct ip_conntrack_expect *exp;
1376         struct ip_conntrack *ct;
1377         int err = 0;
1378
1379         /* caller guarantees that those three CTA_EXPECT_* exist */
1380         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1381         if (err < 0)
1382                 return err;
1383         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK);
1384         if (err < 0)
1385                 return err;
1386         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER);
1387         if (err < 0)
1388                 return err;
1389
1390         /* Look for master conntrack of this expectation */
1391         h = ip_conntrack_find_get(&master_tuple, NULL);
1392         if (!h)
1393                 return -ENOENT;
1394         ct = tuplehash_to_ctrack(h);
1395
1396         if (!ct->helper) {
1397                 /* such conntrack hasn't got any helper, abort */
1398                 err = -EINVAL;
1399                 goto out;
1400         }
1401
1402         exp = ip_conntrack_expect_alloc(ct);
1403         if (!exp) {
1404                 err = -ENOMEM;
1405                 goto out;
1406         }
1407         
1408         exp->expectfn = NULL;
1409         exp->flags = 0;
1410         exp->master = ct;
1411         memcpy(&exp->tuple, &tuple, sizeof(struct ip_conntrack_tuple));
1412         memcpy(&exp->mask, &mask, sizeof(struct ip_conntrack_tuple));
1413
1414         err = ip_conntrack_expect_related(exp);
1415         ip_conntrack_expect_put(exp);
1416
1417 out:    
1418         ip_conntrack_put(tuplehash_to_ctrack(h));
1419         return err;
1420 }
1421
1422 static int
1423 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1424                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1425 {
1426         struct ip_conntrack_tuple tuple;
1427         struct ip_conntrack_expect *exp;
1428         int err = 0;
1429
1430         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1431                 return -EINVAL;
1432
1433         if (!cda[CTA_EXPECT_TUPLE-1]
1434             || !cda[CTA_EXPECT_MASK-1]
1435             || !cda[CTA_EXPECT_MASTER-1])
1436                 return -EINVAL;
1437
1438         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1439         if (err < 0)
1440                 return err;
1441
1442         write_lock_bh(&ip_conntrack_lock);
1443         exp = __ip_conntrack_expect_find(&tuple);
1444
1445         if (!exp) {
1446                 write_unlock_bh(&ip_conntrack_lock);
1447                 err = -ENOENT;
1448                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1449                         err = ctnetlink_create_expect(cda);
1450                 return err;
1451         }
1452
1453         err = -EEXIST;
1454         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1455                 err = ctnetlink_change_expect(exp, cda);
1456         write_unlock_bh(&ip_conntrack_lock);
1457
1458         return err;
1459 }
1460
1461 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1462 static struct notifier_block ctnl_notifier = {
1463         .notifier_call  = ctnetlink_conntrack_event,
1464 };
1465
1466 static struct notifier_block ctnl_notifier_exp = {
1467         .notifier_call  = ctnetlink_expect_event,
1468 };
1469 #endif
1470
1471 static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1472         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1473                                             .attr_count = CTA_MAX, },
1474         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1475                                             .attr_count = CTA_MAX, },
1476         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1477                                             .attr_count = CTA_MAX, },
1478         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1479                                             .attr_count = CTA_MAX, },
1480 };
1481
1482 static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1483         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1484                                             .attr_count = CTA_EXPECT_MAX, },
1485         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1486                                             .attr_count = CTA_EXPECT_MAX, },
1487         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1488                                             .attr_count = CTA_EXPECT_MAX, },
1489 };
1490
1491 static struct nfnetlink_subsystem ctnl_subsys = {
1492         .name                           = "conntrack",
1493         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1494         .cb_count                       = IPCTNL_MSG_MAX,
1495         .cb                             = ctnl_cb,
1496 };
1497
1498 static struct nfnetlink_subsystem ctnl_exp_subsys = {
1499         .name                           = "conntrack_expect",
1500         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1501         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1502         .cb                             = ctnl_exp_cb,
1503 };
1504
1505 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1506 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1507
1508 static int __init ctnetlink_init(void)
1509 {
1510         int ret;
1511
1512         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1513         ret = nfnetlink_subsys_register(&ctnl_subsys);
1514         if (ret < 0) {
1515                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1516                 goto err_out;
1517         }
1518
1519         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1520         if (ret < 0) {
1521                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1522                 goto err_unreg_subsys;
1523         }
1524
1525 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1526         ret = ip_conntrack_register_notifier(&ctnl_notifier);
1527         if (ret < 0) {
1528                 printk("ctnetlink_init: cannot register notifier.\n");
1529                 goto err_unreg_exp_subsys;
1530         }
1531
1532         ret = ip_conntrack_expect_register_notifier(&ctnl_notifier_exp);
1533         if (ret < 0) {
1534                 printk("ctnetlink_init: cannot expect register notifier.\n");
1535                 goto err_unreg_notifier;
1536         }
1537 #endif
1538
1539         return 0;
1540
1541 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1542 err_unreg_notifier:
1543         ip_conntrack_unregister_notifier(&ctnl_notifier);
1544 err_unreg_exp_subsys:
1545         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1546 #endif
1547 err_unreg_subsys:
1548         nfnetlink_subsys_unregister(&ctnl_subsys);
1549 err_out:
1550         return ret;
1551 }
1552
1553 static void __exit ctnetlink_exit(void)
1554 {
1555         printk("ctnetlink: unregistering from nfnetlink.\n");
1556
1557 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1558         ip_conntrack_expect_unregister_notifier(&ctnl_notifier_exp);
1559         ip_conntrack_unregister_notifier(&ctnl_notifier);
1560 #endif
1561
1562         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1563         nfnetlink_subsys_unregister(&ctnl_subsys);
1564         return;
1565 }
1566
1567 module_init(ctnetlink_init);
1568 module_exit(ctnetlink_exit);