[NETFILTER]: nfnetlink: convert to generic netlink attribute functions
[linux-2.6.git] / net / netfilter / nf_conntrack_netlink.c
1 /* Connection tracking via netlink socket. Allows for user space
2  * protocol helpers and general trouble making from userspace.
3  *
4  * (C) 2001 by Jay Schulist <jschlst@samba.org>
5  * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6  * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7  * (C) 2005-2006 by Pablo Neira Ayuso <pablo@eurodev.net>
8  *
9  * Initial connection tracking via netlink development funded and
10  * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11  *
12  * Further development of this code funded by Astaro AG (http://www.astaro.com)
13  *
14  * This software may be used and distributed according to the terms
15  * of the GNU General Public License, incorporated herein by reference.
16  */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/types.h>
22 #include <linux/timer.h>
23 #include <linux/skbuff.h>
24 #include <linux/errno.h>
25 #include <linux/netlink.h>
26 #include <linux/spinlock.h>
27 #include <linux/interrupt.h>
28 #include <linux/notifier.h>
29
30 #include <linux/netfilter.h>
31 #include <net/netlink.h>
32 #include <net/netfilter/nf_conntrack.h>
33 #include <net/netfilter/nf_conntrack_core.h>
34 #include <net/netfilter/nf_conntrack_expect.h>
35 #include <net/netfilter/nf_conntrack_helper.h>
36 #include <net/netfilter/nf_conntrack_l3proto.h>
37 #include <net/netfilter/nf_conntrack_l4proto.h>
38 #include <net/netfilter/nf_conntrack_tuple.h>
39 #ifdef CONFIG_NF_NAT_NEEDED
40 #include <net/netfilter/nf_nat_core.h>
41 #include <net/netfilter/nf_nat_protocol.h>
42 #endif
43
44 #include <linux/netfilter/nfnetlink.h>
45 #include <linux/netfilter/nfnetlink_conntrack.h>
46
47 MODULE_LICENSE("GPL");
48
49 static char __initdata version[] = "0.93";
50
51 static inline int
52 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
53                             const struct nf_conntrack_tuple *tuple,
54                             struct nf_conntrack_l4proto *l4proto)
55 {
56         int ret = 0;
57         struct nlattr *nest_parms;
58
59         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
60         if (!nest_parms)
61                 goto nla_put_failure;
62         NLA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
63
64         if (likely(l4proto->tuple_to_nfattr))
65                 ret = l4proto->tuple_to_nfattr(skb, tuple);
66
67         nla_nest_end(skb, nest_parms);
68
69         return ret;
70
71 nla_put_failure:
72         return -1;
73 }
74
75 static inline int
76 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
77                          const struct nf_conntrack_tuple *tuple,
78                          struct nf_conntrack_l3proto *l3proto)
79 {
80         int ret = 0;
81         struct nlattr *nest_parms;
82
83         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
84         if (!nest_parms)
85                 goto nla_put_failure;
86
87         if (likely(l3proto->tuple_to_nfattr))
88                 ret = l3proto->tuple_to_nfattr(skb, tuple);
89
90         nla_nest_end(skb, nest_parms);
91
92         return ret;
93
94 nla_put_failure:
95         return -1;
96 }
97
98 static inline int
99 ctnetlink_dump_tuples(struct sk_buff *skb,
100                       const struct nf_conntrack_tuple *tuple)
101 {
102         int ret;
103         struct nf_conntrack_l3proto *l3proto;
104         struct nf_conntrack_l4proto *l4proto;
105
106         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
107         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
108         nf_ct_l3proto_put(l3proto);
109
110         if (unlikely(ret < 0))
111                 return ret;
112
113         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
114         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
115         nf_ct_l4proto_put(l4proto);
116
117         return ret;
118 }
119
120 static inline int
121 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
122 {
123         __be32 status = htonl((u_int32_t) ct->status);
124         NLA_PUT(skb, CTA_STATUS, sizeof(status), &status);
125         return 0;
126
127 nla_put_failure:
128         return -1;
129 }
130
131 static inline int
132 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
133 {
134         long timeout_l = ct->timeout.expires - jiffies;
135         __be32 timeout;
136
137         if (timeout_l < 0)
138                 timeout = 0;
139         else
140                 timeout = htonl(timeout_l / HZ);
141
142         NLA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
143         return 0;
144
145 nla_put_failure:
146         return -1;
147 }
148
149 static inline int
150 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
151 {
152         struct nf_conntrack_l4proto *l4proto = nf_ct_l4proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
153         struct nlattr *nest_proto;
154         int ret;
155
156         if (!l4proto->to_nfattr) {
157                 nf_ct_l4proto_put(l4proto);
158                 return 0;
159         }
160
161         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
162         if (!nest_proto)
163                 goto nla_put_failure;
164
165         ret = l4proto->to_nfattr(skb, nest_proto, ct);
166
167         nf_ct_l4proto_put(l4proto);
168
169         nla_nest_end(skb, nest_proto);
170
171         return ret;
172
173 nla_put_failure:
174         nf_ct_l4proto_put(l4proto);
175         return -1;
176 }
177
178 static inline int
179 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
180 {
181         struct nlattr *nest_helper;
182         const struct nf_conn_help *help = nfct_help(ct);
183         struct nf_conntrack_helper *helper;
184
185         if (!help)
186                 return 0;
187
188         rcu_read_lock();
189         helper = rcu_dereference(help->helper);
190         if (!helper)
191                 goto out;
192
193         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
194         if (!nest_helper)
195                 goto nla_put_failure;
196         NLA_PUT(skb, CTA_HELP_NAME, strlen(helper->name), helper->name);
197
198         if (helper->to_nfattr)
199                 helper->to_nfattr(skb, ct);
200
201         nla_nest_end(skb, nest_helper);
202 out:
203         rcu_read_unlock();
204         return 0;
205
206 nla_put_failure:
207         rcu_read_unlock();
208         return -1;
209 }
210
211 #ifdef CONFIG_NF_CT_ACCT
212 static inline int
213 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
214                         enum ip_conntrack_dir dir)
215 {
216         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
217         struct nlattr *nest_count;
218         __be32 tmp;
219
220         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
221         if (!nest_count)
222                 goto nla_put_failure;
223
224         tmp = htonl(ct->counters[dir].packets);
225         NLA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
226
227         tmp = htonl(ct->counters[dir].bytes);
228         NLA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
229
230         nla_nest_end(skb, nest_count);
231
232         return 0;
233
234 nla_put_failure:
235         return -1;
236 }
237 #else
238 #define ctnetlink_dump_counters(a, b, c) (0)
239 #endif
240
241 #ifdef CONFIG_NF_CONNTRACK_MARK
242 static inline int
243 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
244 {
245         __be32 mark = htonl(ct->mark);
246
247         NLA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
248         return 0;
249
250 nla_put_failure:
251         return -1;
252 }
253 #else
254 #define ctnetlink_dump_mark(a, b) (0)
255 #endif
256
257 static inline int
258 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
259 {
260         __be32 id = htonl(ct->id);
261         NLA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
262         return 0;
263
264 nla_put_failure:
265         return -1;
266 }
267
268 static inline int
269 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
270 {
271         __be32 use = htonl(atomic_read(&ct->ct_general.use));
272
273         NLA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
274         return 0;
275
276 nla_put_failure:
277         return -1;
278 }
279
280 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
281
282 static int
283 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
284                     int event, int nowait,
285                     const struct nf_conn *ct)
286 {
287         struct nlmsghdr *nlh;
288         struct nfgenmsg *nfmsg;
289         struct nlattr *nest_parms;
290         unsigned char *b = skb_tail_pointer(skb);
291
292         event |= NFNL_SUBSYS_CTNETLINK << 8;
293         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
294         nfmsg  = NLMSG_DATA(nlh);
295
296         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
297         nfmsg->nfgen_family =
298                 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
299         nfmsg->version      = NFNETLINK_V0;
300         nfmsg->res_id       = 0;
301
302         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
303         if (!nest_parms)
304                 goto nla_put_failure;
305         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
306                 goto nla_put_failure;
307         nla_nest_end(skb, nest_parms);
308
309         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
310         if (!nest_parms)
311                 goto nla_put_failure;
312         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
313                 goto nla_put_failure;
314         nla_nest_end(skb, nest_parms);
315
316         if (ctnetlink_dump_status(skb, ct) < 0 ||
317             ctnetlink_dump_timeout(skb, ct) < 0 ||
318             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
319             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
320             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
321             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
322             ctnetlink_dump_mark(skb, ct) < 0 ||
323             ctnetlink_dump_id(skb, ct) < 0 ||
324             ctnetlink_dump_use(skb, ct) < 0)
325                 goto nla_put_failure;
326
327         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
328         return skb->len;
329
330 nlmsg_failure:
331 nla_put_failure:
332         nlmsg_trim(skb, b);
333         return -1;
334 }
335
336 #ifdef CONFIG_NF_CONNTRACK_EVENTS
337 static int ctnetlink_conntrack_event(struct notifier_block *this,
338                                      unsigned long events, void *ptr)
339 {
340         struct nlmsghdr *nlh;
341         struct nfgenmsg *nfmsg;
342         struct nlattr *nest_parms;
343         struct nf_conn *ct = (struct nf_conn *)ptr;
344         struct sk_buff *skb;
345         unsigned int type;
346         sk_buff_data_t b;
347         unsigned int flags = 0, group;
348
349         /* ignore our fake conntrack entry */
350         if (ct == &nf_conntrack_untracked)
351                 return NOTIFY_DONE;
352
353         if (events & IPCT_DESTROY) {
354                 type = IPCTNL_MSG_CT_DELETE;
355                 group = NFNLGRP_CONNTRACK_DESTROY;
356         } else  if (events & (IPCT_NEW | IPCT_RELATED)) {
357                 type = IPCTNL_MSG_CT_NEW;
358                 flags = NLM_F_CREATE|NLM_F_EXCL;
359                 group = NFNLGRP_CONNTRACK_NEW;
360         } else  if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
361                 type = IPCTNL_MSG_CT_NEW;
362                 group = NFNLGRP_CONNTRACK_UPDATE;
363         } else
364                 return NOTIFY_DONE;
365
366         if (!nfnetlink_has_listeners(group))
367                 return NOTIFY_DONE;
368
369         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
370         if (!skb)
371                 return NOTIFY_DONE;
372
373         b = skb->tail;
374
375         type |= NFNL_SUBSYS_CTNETLINK << 8;
376         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
377         nfmsg = NLMSG_DATA(nlh);
378
379         nlh->nlmsg_flags    = flags;
380         nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
381         nfmsg->version  = NFNETLINK_V0;
382         nfmsg->res_id   = 0;
383
384         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
385         if (!nest_parms)
386                 goto nla_put_failure;
387         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
388                 goto nla_put_failure;
389         nla_nest_end(skb, nest_parms);
390
391         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
392         if (!nest_parms)
393                 goto nla_put_failure;
394         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
395                 goto nla_put_failure;
396         nla_nest_end(skb, nest_parms);
397
398         if (events & IPCT_DESTROY) {
399                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
400                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
401                         goto nla_put_failure;
402         } else {
403                 if (ctnetlink_dump_status(skb, ct) < 0)
404                         goto nla_put_failure;
405
406                 if (ctnetlink_dump_timeout(skb, ct) < 0)
407                         goto nla_put_failure;
408
409                 if (events & IPCT_PROTOINFO
410                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
411                         goto nla_put_failure;
412
413                 if ((events & IPCT_HELPER || nfct_help(ct))
414                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
415                         goto nla_put_failure;
416
417 #ifdef CONFIG_NF_CONNTRACK_MARK
418                 if ((events & IPCT_MARK || ct->mark)
419                     && ctnetlink_dump_mark(skb, ct) < 0)
420                         goto nla_put_failure;
421 #endif
422
423                 if (events & IPCT_COUNTER_FILLING &&
424                     (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
425                      ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
426                         goto nla_put_failure;
427         }
428
429         nlh->nlmsg_len = skb->tail - b;
430         nfnetlink_send(skb, 0, group, 0);
431         return NOTIFY_DONE;
432
433 nlmsg_failure:
434 nla_put_failure:
435         kfree_skb(skb);
436         return NOTIFY_DONE;
437 }
438 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
439
440 static int ctnetlink_done(struct netlink_callback *cb)
441 {
442         if (cb->args[1])
443                 nf_ct_put((struct nf_conn *)cb->args[1]);
444         return 0;
445 }
446
447 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
448
449 static int
450 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
451 {
452         struct nf_conn *ct, *last;
453         struct nf_conntrack_tuple_hash *h;
454         struct hlist_node *n;
455         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
456         u_int8_t l3proto = nfmsg->nfgen_family;
457
458         read_lock_bh(&nf_conntrack_lock);
459         last = (struct nf_conn *)cb->args[1];
460         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
461 restart:
462                 hlist_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
463                                      hnode) {
464                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
465                                 continue;
466                         ct = nf_ct_tuplehash_to_ctrack(h);
467                         /* Dump entries of a given L3 protocol number.
468                          * If it is not specified, ie. l3proto == 0,
469                          * then dump everything. */
470                         if (l3proto && L3PROTO(ct) != l3proto)
471                                 continue;
472                         if (cb->args[1]) {
473                                 if (ct != last)
474                                         continue;
475                                 cb->args[1] = 0;
476                         }
477                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
478                                                 cb->nlh->nlmsg_seq,
479                                                 IPCTNL_MSG_CT_NEW,
480                                                 1, ct) < 0) {
481                                 nf_conntrack_get(&ct->ct_general);
482                                 cb->args[1] = (unsigned long)ct;
483                                 goto out;
484                         }
485 #ifdef CONFIG_NF_CT_ACCT
486                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
487                                                 IPCTNL_MSG_CT_GET_CTRZERO)
488                                 memset(&ct->counters, 0, sizeof(ct->counters));
489 #endif
490                 }
491                 if (cb->args[1]) {
492                         cb->args[1] = 0;
493                         goto restart;
494                 }
495         }
496 out:
497         read_unlock_bh(&nf_conntrack_lock);
498         if (last)
499                 nf_ct_put(last);
500
501         return skb->len;
502 }
503
504 static inline int
505 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
506 {
507         struct nlattr *tb[CTA_IP_MAX+1];
508         struct nf_conntrack_l3proto *l3proto;
509         int ret = 0;
510
511         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
512
513         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
514
515         if (likely(l3proto->nfattr_to_tuple))
516                 ret = l3proto->nfattr_to_tuple(tb, tuple);
517
518         nf_ct_l3proto_put(l3proto);
519
520         return ret;
521 }
522
523 static const size_t cta_min_proto[CTA_PROTO_MAX+1] = {
524         [CTA_PROTO_NUM] = sizeof(u_int8_t),
525 };
526
527 static inline int
528 ctnetlink_parse_tuple_proto(struct nlattr *attr,
529                             struct nf_conntrack_tuple *tuple)
530 {
531         struct nlattr *tb[CTA_PROTO_MAX+1];
532         struct nf_conntrack_l4proto *l4proto;
533         int ret = 0;
534
535         nla_parse_nested(tb, CTA_PROTO_MAX, attr, NULL);
536
537         if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
538                 return -EINVAL;
539
540         if (!tb[CTA_PROTO_NUM])
541                 return -EINVAL;
542         tuple->dst.protonum = *(u_int8_t *)nla_data(tb[CTA_PROTO_NUM]);
543
544         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
545
546         if (likely(l4proto->nfattr_to_tuple))
547                 ret = l4proto->nfattr_to_tuple(tb, tuple);
548
549         nf_ct_l4proto_put(l4proto);
550
551         return ret;
552 }
553
554 static inline int
555 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
556                       enum ctattr_tuple type, u_int8_t l3num)
557 {
558         struct nlattr *tb[CTA_TUPLE_MAX+1];
559         int err;
560
561         memset(tuple, 0, sizeof(*tuple));
562
563         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
564
565         if (!tb[CTA_TUPLE_IP])
566                 return -EINVAL;
567
568         tuple->src.l3num = l3num;
569
570         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
571         if (err < 0)
572                 return err;
573
574         if (!tb[CTA_TUPLE_PROTO])
575                 return -EINVAL;
576
577         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
578         if (err < 0)
579                 return err;
580
581         /* orig and expect tuples get DIR_ORIGINAL */
582         if (type == CTA_TUPLE_REPLY)
583                 tuple->dst.dir = IP_CT_DIR_REPLY;
584         else
585                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
586
587         return 0;
588 }
589
590 #ifdef CONFIG_NF_NAT_NEEDED
591 static const size_t cta_min_protonat[CTA_PROTONAT_MAX+1] = {
592         [CTA_PROTONAT_PORT_MIN] = sizeof(u_int16_t),
593         [CTA_PROTONAT_PORT_MAX] = sizeof(u_int16_t),
594 };
595
596 static int nfnetlink_parse_nat_proto(struct nlattr *attr,
597                                      const struct nf_conn *ct,
598                                      struct nf_nat_range *range)
599 {
600         struct nlattr *tb[CTA_PROTONAT_MAX+1];
601         struct nf_nat_protocol *npt;
602
603         nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, NULL);
604
605         if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
606                 return -EINVAL;
607
608         npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
609
610         if (!npt->nfattr_to_range) {
611                 nf_nat_proto_put(npt);
612                 return 0;
613         }
614
615         /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
616         if (npt->nfattr_to_range(tb, range) > 0)
617                 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
618
619         nf_nat_proto_put(npt);
620
621         return 0;
622 }
623
624 static const size_t cta_min_nat[CTA_NAT_MAX+1] = {
625         [CTA_NAT_MINIP]         = sizeof(u_int32_t),
626         [CTA_NAT_MAXIP]         = sizeof(u_int32_t),
627 };
628
629 static inline int
630 nfnetlink_parse_nat(struct nlattr *nat,
631                     const struct nf_conn *ct, struct nf_nat_range *range)
632 {
633         struct nlattr *tb[CTA_NAT_MAX+1];
634         int err;
635
636         memset(range, 0, sizeof(*range));
637
638         nla_parse_nested(tb, CTA_NAT_MAX, nat, NULL);
639
640         if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
641                 return -EINVAL;
642
643         if (tb[CTA_NAT_MINIP])
644                 range->min_ip = *(__be32 *)nla_data(tb[CTA_NAT_MINIP]);
645
646         if (!tb[CTA_NAT_MAXIP])
647                 range->max_ip = range->min_ip;
648         else
649                 range->max_ip = *(__be32 *)nla_data(tb[CTA_NAT_MAXIP]);
650
651         if (range->min_ip)
652                 range->flags |= IP_NAT_RANGE_MAP_IPS;
653
654         if (!tb[CTA_NAT_PROTO])
655                 return 0;
656
657         err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
658         if (err < 0)
659                 return err;
660
661         return 0;
662 }
663 #endif
664
665 static inline int
666 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
667 {
668         struct nlattr *tb[CTA_HELP_MAX+1];
669
670         nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
671
672         if (!tb[CTA_HELP_NAME])
673                 return -EINVAL;
674
675         *helper_name = nla_data(tb[CTA_HELP_NAME]);
676
677         return 0;
678 }
679
680 static const size_t cta_min[CTA_MAX+1] = {
681         [CTA_STATUS]            = sizeof(u_int32_t),
682         [CTA_TIMEOUT]           = sizeof(u_int32_t),
683         [CTA_MARK]              = sizeof(u_int32_t),
684         [CTA_USE]               = sizeof(u_int32_t),
685         [CTA_ID]                = sizeof(u_int32_t)
686 };
687
688 static int
689 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
690                         struct nlmsghdr *nlh, struct nlattr *cda[])
691 {
692         struct nf_conntrack_tuple_hash *h;
693         struct nf_conntrack_tuple tuple;
694         struct nf_conn *ct;
695         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
696         u_int8_t u3 = nfmsg->nfgen_family;
697         int err = 0;
698
699         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
700                 return -EINVAL;
701
702         if (cda[CTA_TUPLE_ORIG])
703                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
704         else if (cda[CTA_TUPLE_REPLY])
705                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
706         else {
707                 /* Flush the whole table */
708                 nf_conntrack_flush();
709                 return 0;
710         }
711
712         if (err < 0)
713                 return err;
714
715         h = nf_conntrack_find_get(&tuple);
716         if (!h)
717                 return -ENOENT;
718
719         ct = nf_ct_tuplehash_to_ctrack(h);
720
721         if (cda[CTA_ID]) {
722                 u_int32_t id = ntohl(*(__be32 *)nla_data(cda[CTA_ID]));
723                 if (ct->id != id) {
724                         nf_ct_put(ct);
725                         return -ENOENT;
726                 }
727         }
728         if (del_timer(&ct->timeout))
729                 ct->timeout.function((unsigned long)ct);
730
731         nf_ct_put(ct);
732
733         return 0;
734 }
735
736 static int
737 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
738                         struct nlmsghdr *nlh, struct nlattr *cda[])
739 {
740         struct nf_conntrack_tuple_hash *h;
741         struct nf_conntrack_tuple tuple;
742         struct nf_conn *ct;
743         struct sk_buff *skb2 = NULL;
744         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
745         u_int8_t u3 = nfmsg->nfgen_family;
746         int err = 0;
747
748         if (nlh->nlmsg_flags & NLM_F_DUMP) {
749 #ifndef CONFIG_NF_CT_ACCT
750                 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
751                         return -ENOTSUPP;
752 #endif
753                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
754                                           ctnetlink_done);
755         }
756
757         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
758                 return -EINVAL;
759
760         if (cda[CTA_TUPLE_ORIG])
761                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
762         else if (cda[CTA_TUPLE_REPLY])
763                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
764         else
765                 return -EINVAL;
766
767         if (err < 0)
768                 return err;
769
770         h = nf_conntrack_find_get(&tuple);
771         if (!h)
772                 return -ENOENT;
773
774         ct = nf_ct_tuplehash_to_ctrack(h);
775
776         err = -ENOMEM;
777         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
778         if (!skb2) {
779                 nf_ct_put(ct);
780                 return -ENOMEM;
781         }
782
783         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
784                                   IPCTNL_MSG_CT_NEW, 1, ct);
785         nf_ct_put(ct);
786         if (err <= 0)
787                 goto free;
788
789         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
790         if (err < 0)
791                 goto out;
792
793         return 0;
794
795 free:
796         kfree_skb(skb2);
797 out:
798         return err;
799 }
800
801 static inline int
802 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
803 {
804         unsigned long d;
805         unsigned int status = ntohl(*(__be32 *)nla_data(cda[CTA_STATUS]));
806         d = ct->status ^ status;
807
808         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
809                 /* unchangeable */
810                 return -EINVAL;
811
812         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
813                 /* SEEN_REPLY bit can only be set */
814                 return -EINVAL;
815
816
817         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
818                 /* ASSURED bit can only be set */
819                 return -EINVAL;
820
821         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
822 #ifndef CONFIG_NF_NAT_NEEDED
823                 return -EINVAL;
824 #else
825                 struct nf_nat_range range;
826
827                 if (cda[CTA_NAT_DST]) {
828                         if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
829                                                 &range) < 0)
830                                 return -EINVAL;
831                         if (nf_nat_initialized(ct,
832                                                HOOK2MANIP(NF_IP_PRE_ROUTING)))
833                                 return -EEXIST;
834                         nf_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
835                 }
836                 if (cda[CTA_NAT_SRC]) {
837                         if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
838                                                 &range) < 0)
839                                 return -EINVAL;
840                         if (nf_nat_initialized(ct,
841                                                HOOK2MANIP(NF_IP_POST_ROUTING)))
842                                 return -EEXIST;
843                         nf_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
844                 }
845 #endif
846         }
847
848         /* Be careful here, modifying NAT bits can screw up things,
849          * so don't let users modify them directly if they don't pass
850          * nf_nat_range. */
851         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
852         return 0;
853 }
854
855
856 static inline int
857 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
858 {
859         struct nf_conntrack_helper *helper;
860         struct nf_conn_help *help = nfct_help(ct);
861         char *helpname;
862         int err;
863
864         /* don't change helper of sibling connections */
865         if (ct->master)
866                 return -EINVAL;
867
868         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
869         if (err < 0)
870                 return err;
871
872         if (!strcmp(helpname, "")) {
873                 if (help && help->helper) {
874                         /* we had a helper before ... */
875                         nf_ct_remove_expectations(ct);
876                         rcu_assign_pointer(help->helper, NULL);
877                 }
878
879                 return 0;
880         }
881
882         helper = __nf_conntrack_helper_find_byname(helpname);
883         if (helper == NULL)
884                 return -EINVAL;
885
886         if (help) {
887                 if (help->helper == helper)
888                         return 0;
889                 if (help->helper)
890                         return -EBUSY;
891                 /* need to zero data of old helper */
892                 memset(&help->help, 0, sizeof(help->help));
893         } else {
894                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
895                 if (help == NULL)
896                         return -ENOMEM;
897         }
898
899         rcu_assign_pointer(help->helper, helper);
900
901         return 0;
902 }
903
904 static inline int
905 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
906 {
907         u_int32_t timeout = ntohl(*(__be32 *)nla_data(cda[CTA_TIMEOUT]));
908
909         if (!del_timer(&ct->timeout))
910                 return -ETIME;
911
912         ct->timeout.expires = jiffies + timeout * HZ;
913         add_timer(&ct->timeout);
914
915         return 0;
916 }
917
918 static inline int
919 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
920 {
921         struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
922         struct nf_conntrack_l4proto *l4proto;
923         u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
924         u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
925         int err = 0;
926
927         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
928
929         l4proto = nf_ct_l4proto_find_get(l3num, npt);
930
931         if (l4proto->from_nfattr)
932                 err = l4proto->from_nfattr(tb, ct);
933         nf_ct_l4proto_put(l4proto);
934
935         return err;
936 }
937
938 static int
939 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
940 {
941         int err;
942
943         if (cda[CTA_HELP]) {
944                 err = ctnetlink_change_helper(ct, cda);
945                 if (err < 0)
946                         return err;
947         }
948
949         if (cda[CTA_TIMEOUT]) {
950                 err = ctnetlink_change_timeout(ct, cda);
951                 if (err < 0)
952                         return err;
953         }
954
955         if (cda[CTA_STATUS]) {
956                 err = ctnetlink_change_status(ct, cda);
957                 if (err < 0)
958                         return err;
959         }
960
961         if (cda[CTA_PROTOINFO]) {
962                 err = ctnetlink_change_protoinfo(ct, cda);
963                 if (err < 0)
964                         return err;
965         }
966
967 #if defined(CONFIG_NF_CONNTRACK_MARK)
968         if (cda[CTA_MARK])
969                 ct->mark = ntohl(*(__be32 *)nla_data(cda[CTA_MARK]));
970 #endif
971
972         return 0;
973 }
974
975 static int
976 ctnetlink_create_conntrack(struct nlattr *cda[],
977                            struct nf_conntrack_tuple *otuple,
978                            struct nf_conntrack_tuple *rtuple)
979 {
980         struct nf_conn *ct;
981         int err = -EINVAL;
982         struct nf_conn_help *help;
983         struct nf_conntrack_helper *helper;
984
985         ct = nf_conntrack_alloc(otuple, rtuple);
986         if (ct == NULL || IS_ERR(ct))
987                 return -ENOMEM;
988
989         if (!cda[CTA_TIMEOUT])
990                 goto err;
991         ct->timeout.expires = ntohl(*(__be32 *)nla_data(cda[CTA_TIMEOUT]));
992
993         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
994         ct->status |= IPS_CONFIRMED;
995
996         if (cda[CTA_STATUS]) {
997                 err = ctnetlink_change_status(ct, cda);
998                 if (err < 0)
999                         goto err;
1000         }
1001
1002         if (cda[CTA_PROTOINFO]) {
1003                 err = ctnetlink_change_protoinfo(ct, cda);
1004                 if (err < 0)
1005                         goto err;
1006         }
1007
1008 #if defined(CONFIG_NF_CONNTRACK_MARK)
1009         if (cda[CTA_MARK])
1010                 ct->mark = ntohl(*(__be32 *)nla_data(cda[CTA_MARK]));
1011 #endif
1012
1013         helper = nf_ct_helper_find_get(rtuple);
1014         if (helper) {
1015                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
1016                 if (help == NULL) {
1017                         nf_ct_helper_put(helper);
1018                         err = -ENOMEM;
1019                         goto err;
1020                 }
1021                 /* not in hash table yet so not strictly necessary */
1022                 rcu_assign_pointer(help->helper, helper);
1023         }
1024
1025         add_timer(&ct->timeout);
1026         nf_conntrack_hash_insert(ct);
1027
1028         if (helper)
1029                 nf_ct_helper_put(helper);
1030
1031         return 0;
1032
1033 err:
1034         nf_conntrack_free(ct);
1035         return err;
1036 }
1037
1038 static int
1039 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1040                         struct nlmsghdr *nlh, struct nlattr *cda[])
1041 {
1042         struct nf_conntrack_tuple otuple, rtuple;
1043         struct nf_conntrack_tuple_hash *h = NULL;
1044         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1045         u_int8_t u3 = nfmsg->nfgen_family;
1046         int err = 0;
1047
1048         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
1049                 return -EINVAL;
1050
1051         if (cda[CTA_TUPLE_ORIG]) {
1052                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1053                 if (err < 0)
1054                         return err;
1055         }
1056
1057         if (cda[CTA_TUPLE_REPLY]) {
1058                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1059                 if (err < 0)
1060                         return err;
1061         }
1062
1063         write_lock_bh(&nf_conntrack_lock);
1064         if (cda[CTA_TUPLE_ORIG])
1065                 h = __nf_conntrack_find(&otuple, NULL);
1066         else if (cda[CTA_TUPLE_REPLY])
1067                 h = __nf_conntrack_find(&rtuple, NULL);
1068
1069         if (h == NULL) {
1070                 write_unlock_bh(&nf_conntrack_lock);
1071                 err = -ENOENT;
1072                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1073                         err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
1074                 return err;
1075         }
1076         /* implicit 'else' */
1077
1078         /* We manipulate the conntrack inside the global conntrack table lock,
1079          * so there's no need to increase the refcount */
1080         err = -EEXIST;
1081         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1082                 /* we only allow nat config for new conntracks */
1083                 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1084                         err = -EINVAL;
1085                         goto out_unlock;
1086                 }
1087                 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1088                                                  cda);
1089         }
1090
1091 out_unlock:
1092         write_unlock_bh(&nf_conntrack_lock);
1093         return err;
1094 }
1095
1096 /***********************************************************************
1097  * EXPECT
1098  ***********************************************************************/
1099
1100 static inline int
1101 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1102                          const struct nf_conntrack_tuple *tuple,
1103                          enum ctattr_expect type)
1104 {
1105         struct nlattr *nest_parms;
1106
1107         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1108         if (!nest_parms)
1109                 goto nla_put_failure;
1110         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1111                 goto nla_put_failure;
1112         nla_nest_end(skb, nest_parms);
1113
1114         return 0;
1115
1116 nla_put_failure:
1117         return -1;
1118 }
1119
1120 static inline int
1121 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1122                         const struct nf_conntrack_tuple *tuple,
1123                         const struct nf_conntrack_tuple_mask *mask)
1124 {
1125         int ret;
1126         struct nf_conntrack_l3proto *l3proto;
1127         struct nf_conntrack_l4proto *l4proto;
1128         struct nf_conntrack_tuple m;
1129         struct nlattr *nest_parms;
1130
1131         memset(&m, 0xFF, sizeof(m));
1132         m.src.u.all = mask->src.u.all;
1133         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1134
1135         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1136         if (!nest_parms)
1137                 goto nla_put_failure;
1138
1139         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1140         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1141         nf_ct_l3proto_put(l3proto);
1142
1143         if (unlikely(ret < 0))
1144                 goto nla_put_failure;
1145
1146         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1147         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1148         nf_ct_l4proto_put(l4proto);
1149         if (unlikely(ret < 0))
1150                 goto nla_put_failure;
1151
1152         nla_nest_end(skb, nest_parms);
1153
1154         return 0;
1155
1156 nla_put_failure:
1157         return -1;
1158 }
1159
1160 static inline int
1161 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1162                           const struct nf_conntrack_expect *exp)
1163 {
1164         struct nf_conn *master = exp->master;
1165         __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1166         __be32 id = htonl(exp->id);
1167
1168         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1169                 goto nla_put_failure;
1170         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1171                 goto nla_put_failure;
1172         if (ctnetlink_exp_dump_tuple(skb,
1173                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1174                                  CTA_EXPECT_MASTER) < 0)
1175                 goto nla_put_failure;
1176
1177         NLA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1178         NLA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1179
1180         return 0;
1181
1182 nla_put_failure:
1183         return -1;
1184 }
1185
1186 static int
1187 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1188                     int event,
1189                     int nowait,
1190                     const struct nf_conntrack_expect *exp)
1191 {
1192         struct nlmsghdr *nlh;
1193         struct nfgenmsg *nfmsg;
1194         unsigned char *b = skb_tail_pointer(skb);
1195
1196         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1197         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1198         nfmsg  = NLMSG_DATA(nlh);
1199
1200         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1201         nfmsg->nfgen_family = exp->tuple.src.l3num;
1202         nfmsg->version      = NFNETLINK_V0;
1203         nfmsg->res_id       = 0;
1204
1205         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1206                 goto nla_put_failure;
1207
1208         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1209         return skb->len;
1210
1211 nlmsg_failure:
1212 nla_put_failure:
1213         nlmsg_trim(skb, b);
1214         return -1;
1215 }
1216
1217 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1218 static int ctnetlink_expect_event(struct notifier_block *this,
1219                                   unsigned long events, void *ptr)
1220 {
1221         struct nlmsghdr *nlh;
1222         struct nfgenmsg *nfmsg;
1223         struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1224         struct sk_buff *skb;
1225         unsigned int type;
1226         sk_buff_data_t b;
1227         int flags = 0;
1228
1229         if (events & IPEXP_NEW) {
1230                 type = IPCTNL_MSG_EXP_NEW;
1231                 flags = NLM_F_CREATE|NLM_F_EXCL;
1232         } else
1233                 return NOTIFY_DONE;
1234
1235         if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1236                 return NOTIFY_DONE;
1237
1238         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1239         if (!skb)
1240                 return NOTIFY_DONE;
1241
1242         b = skb->tail;
1243
1244         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1245         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1246         nfmsg = NLMSG_DATA(nlh);
1247
1248         nlh->nlmsg_flags    = flags;
1249         nfmsg->nfgen_family = exp->tuple.src.l3num;
1250         nfmsg->version      = NFNETLINK_V0;
1251         nfmsg->res_id       = 0;
1252
1253         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1254                 goto nla_put_failure;
1255
1256         nlh->nlmsg_len = skb->tail - b;
1257         nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1258         return NOTIFY_DONE;
1259
1260 nlmsg_failure:
1261 nla_put_failure:
1262         kfree_skb(skb);
1263         return NOTIFY_DONE;
1264 }
1265 #endif
1266 static int ctnetlink_exp_done(struct netlink_callback *cb)
1267 {
1268         if (cb->args[1])
1269                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1270         return 0;
1271 }
1272
1273 static int
1274 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1275 {
1276         struct nf_conntrack_expect *exp, *last;
1277         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1278         struct hlist_node *n;
1279         u_int8_t l3proto = nfmsg->nfgen_family;
1280
1281         read_lock_bh(&nf_conntrack_lock);
1282         last = (struct nf_conntrack_expect *)cb->args[1];
1283         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1284 restart:
1285                 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1286                                      hnode) {
1287                         if (l3proto && exp->tuple.src.l3num != l3proto)
1288                                 continue;
1289                         if (cb->args[1]) {
1290                                 if (exp != last)
1291                                         continue;
1292                                 cb->args[1] = 0;
1293                         }
1294                         if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1295                                                     cb->nlh->nlmsg_seq,
1296                                                     IPCTNL_MSG_EXP_NEW,
1297                                                     1, exp) < 0) {
1298                                 atomic_inc(&exp->use);
1299                                 cb->args[1] = (unsigned long)exp;
1300                                 goto out;
1301                         }
1302                 }
1303                 if (cb->args[1]) {
1304                         cb->args[1] = 0;
1305                         goto restart;
1306                 }
1307         }
1308 out:
1309         read_unlock_bh(&nf_conntrack_lock);
1310         if (last)
1311                 nf_ct_expect_put(last);
1312
1313         return skb->len;
1314 }
1315
1316 static const size_t cta_min_exp[CTA_EXPECT_MAX+1] = {
1317         [CTA_EXPECT_TIMEOUT]    = sizeof(u_int32_t),
1318         [CTA_EXPECT_ID]         = sizeof(u_int32_t)
1319 };
1320
1321 static int
1322 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1323                      struct nlmsghdr *nlh, struct nlattr *cda[])
1324 {
1325         struct nf_conntrack_tuple tuple;
1326         struct nf_conntrack_expect *exp;
1327         struct sk_buff *skb2;
1328         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1329         u_int8_t u3 = nfmsg->nfgen_family;
1330         int err = 0;
1331
1332         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1333                 return -EINVAL;
1334
1335         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1336                 return netlink_dump_start(ctnl, skb, nlh,
1337                                           ctnetlink_exp_dump_table,
1338                                           ctnetlink_exp_done);
1339         }
1340
1341         if (cda[CTA_EXPECT_MASTER])
1342                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1343         else
1344                 return -EINVAL;
1345
1346         if (err < 0)
1347                 return err;
1348
1349         exp = nf_ct_expect_find_get(&tuple);
1350         if (!exp)
1351                 return -ENOENT;
1352
1353         if (cda[CTA_EXPECT_ID]) {
1354                 __be32 id = *(__be32 *)nla_data(cda[CTA_EXPECT_ID]);
1355                 if (exp->id != ntohl(id)) {
1356                         nf_ct_expect_put(exp);
1357                         return -ENOENT;
1358                 }
1359         }
1360
1361         err = -ENOMEM;
1362         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1363         if (!skb2)
1364                 goto out;
1365
1366         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1367                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1368                                       1, exp);
1369         if (err <= 0)
1370                 goto free;
1371
1372         nf_ct_expect_put(exp);
1373
1374         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1375
1376 free:
1377         kfree_skb(skb2);
1378 out:
1379         nf_ct_expect_put(exp);
1380         return err;
1381 }
1382
1383 static int
1384 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1385                      struct nlmsghdr *nlh, struct nlattr *cda[])
1386 {
1387         struct nf_conntrack_expect *exp;
1388         struct nf_conntrack_tuple tuple;
1389         struct nf_conntrack_helper *h;
1390         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1391         struct hlist_node *n, *next;
1392         u_int8_t u3 = nfmsg->nfgen_family;
1393         unsigned int i;
1394         int err;
1395
1396         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1397                 return -EINVAL;
1398
1399         if (cda[CTA_EXPECT_TUPLE]) {
1400                 /* delete a single expect by tuple */
1401                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1402                 if (err < 0)
1403                         return err;
1404
1405                 /* bump usage count to 2 */
1406                 exp = nf_ct_expect_find_get(&tuple);
1407                 if (!exp)
1408                         return -ENOENT;
1409
1410                 if (cda[CTA_EXPECT_ID]) {
1411                         __be32 id = *(__be32 *)nla_data(cda[CTA_EXPECT_ID]);
1412                         if (exp->id != ntohl(id)) {
1413                                 nf_ct_expect_put(exp);
1414                                 return -ENOENT;
1415                         }
1416                 }
1417
1418                 /* after list removal, usage count == 1 */
1419                 nf_ct_unexpect_related(exp);
1420                 /* have to put what we 'get' above.
1421                  * after this line usage count == 0 */
1422                 nf_ct_expect_put(exp);
1423         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1424                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1425                 struct nf_conn_help *m_help;
1426
1427                 /* delete all expectations for this helper */
1428                 write_lock_bh(&nf_conntrack_lock);
1429                 h = __nf_conntrack_helper_find_byname(name);
1430                 if (!h) {
1431                         write_unlock_bh(&nf_conntrack_lock);
1432                         return -EINVAL;
1433                 }
1434                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1435                         hlist_for_each_entry_safe(exp, n, next,
1436                                                   &nf_ct_expect_hash[i],
1437                                                   hnode) {
1438                                 m_help = nfct_help(exp->master);
1439                                 if (m_help->helper == h
1440                                     && del_timer(&exp->timeout)) {
1441                                         nf_ct_unlink_expect(exp);
1442                                         nf_ct_expect_put(exp);
1443                                 }
1444                         }
1445                 }
1446                 write_unlock_bh(&nf_conntrack_lock);
1447         } else {
1448                 /* This basically means we have to flush everything*/
1449                 write_lock_bh(&nf_conntrack_lock);
1450                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1451                         hlist_for_each_entry_safe(exp, n, next,
1452                                                   &nf_ct_expect_hash[i],
1453                                                   hnode) {
1454                                 if (del_timer(&exp->timeout)) {
1455                                         nf_ct_unlink_expect(exp);
1456                                         nf_ct_expect_put(exp);
1457                                 }
1458                         }
1459                 }
1460                 write_unlock_bh(&nf_conntrack_lock);
1461         }
1462
1463         return 0;
1464 }
1465 static int
1466 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1467 {
1468         return -EOPNOTSUPP;
1469 }
1470
1471 static int
1472 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1473 {
1474         struct nf_conntrack_tuple tuple, mask, master_tuple;
1475         struct nf_conntrack_tuple_hash *h = NULL;
1476         struct nf_conntrack_expect *exp;
1477         struct nf_conn *ct;
1478         struct nf_conn_help *help;
1479         int err = 0;
1480
1481         /* caller guarantees that those three CTA_EXPECT_* exist */
1482         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1483         if (err < 0)
1484                 return err;
1485         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1486         if (err < 0)
1487                 return err;
1488         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1489         if (err < 0)
1490                 return err;
1491
1492         /* Look for master conntrack of this expectation */
1493         h = nf_conntrack_find_get(&master_tuple);
1494         if (!h)
1495                 return -ENOENT;
1496         ct = nf_ct_tuplehash_to_ctrack(h);
1497         help = nfct_help(ct);
1498
1499         if (!help || !help->helper) {
1500                 /* such conntrack hasn't got any helper, abort */
1501                 err = -EINVAL;
1502                 goto out;
1503         }
1504
1505         exp = nf_ct_expect_alloc(ct);
1506         if (!exp) {
1507                 err = -ENOMEM;
1508                 goto out;
1509         }
1510
1511         exp->expectfn = NULL;
1512         exp->flags = 0;
1513         exp->master = ct;
1514         exp->helper = NULL;
1515         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1516         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1517         exp->mask.src.u.all = mask.src.u.all;
1518
1519         err = nf_ct_expect_related(exp);
1520         nf_ct_expect_put(exp);
1521
1522 out:
1523         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1524         return err;
1525 }
1526
1527 static int
1528 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1529                      struct nlmsghdr *nlh, struct nlattr *cda[])
1530 {
1531         struct nf_conntrack_tuple tuple;
1532         struct nf_conntrack_expect *exp;
1533         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1534         u_int8_t u3 = nfmsg->nfgen_family;
1535         int err = 0;
1536
1537         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1538                 return -EINVAL;
1539
1540         if (!cda[CTA_EXPECT_TUPLE]
1541             || !cda[CTA_EXPECT_MASK]
1542             || !cda[CTA_EXPECT_MASTER])
1543                 return -EINVAL;
1544
1545         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1546         if (err < 0)
1547                 return err;
1548
1549         write_lock_bh(&nf_conntrack_lock);
1550         exp = __nf_ct_expect_find(&tuple);
1551
1552         if (!exp) {
1553                 write_unlock_bh(&nf_conntrack_lock);
1554                 err = -ENOENT;
1555                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1556                         err = ctnetlink_create_expect(cda, u3);
1557                 return err;
1558         }
1559
1560         err = -EEXIST;
1561         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1562                 err = ctnetlink_change_expect(exp, cda);
1563         write_unlock_bh(&nf_conntrack_lock);
1564
1565         return err;
1566 }
1567
1568 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1569 static struct notifier_block ctnl_notifier = {
1570         .notifier_call  = ctnetlink_conntrack_event,
1571 };
1572
1573 static struct notifier_block ctnl_notifier_exp = {
1574         .notifier_call  = ctnetlink_expect_event,
1575 };
1576 #endif
1577
1578 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1579         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1580                                             .attr_count = CTA_MAX, },
1581         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1582                                             .attr_count = CTA_MAX, },
1583         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1584                                             .attr_count = CTA_MAX, },
1585         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1586                                             .attr_count = CTA_MAX, },
1587 };
1588
1589 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1590         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1591                                             .attr_count = CTA_EXPECT_MAX, },
1592         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1593                                             .attr_count = CTA_EXPECT_MAX, },
1594         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1595                                             .attr_count = CTA_EXPECT_MAX, },
1596 };
1597
1598 static const struct nfnetlink_subsystem ctnl_subsys = {
1599         .name                           = "conntrack",
1600         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1601         .cb_count                       = IPCTNL_MSG_MAX,
1602         .cb                             = ctnl_cb,
1603 };
1604
1605 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1606         .name                           = "conntrack_expect",
1607         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1608         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1609         .cb                             = ctnl_exp_cb,
1610 };
1611
1612 MODULE_ALIAS("ip_conntrack_netlink");
1613 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1614 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1615
1616 static int __init ctnetlink_init(void)
1617 {
1618         int ret;
1619
1620         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1621         ret = nfnetlink_subsys_register(&ctnl_subsys);
1622         if (ret < 0) {
1623                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1624                 goto err_out;
1625         }
1626
1627         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1628         if (ret < 0) {
1629                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1630                 goto err_unreg_subsys;
1631         }
1632
1633 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1634         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1635         if (ret < 0) {
1636                 printk("ctnetlink_init: cannot register notifier.\n");
1637                 goto err_unreg_exp_subsys;
1638         }
1639
1640         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1641         if (ret < 0) {
1642                 printk("ctnetlink_init: cannot expect register notifier.\n");
1643                 goto err_unreg_notifier;
1644         }
1645 #endif
1646
1647         return 0;
1648
1649 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1650 err_unreg_notifier:
1651         nf_conntrack_unregister_notifier(&ctnl_notifier);
1652 err_unreg_exp_subsys:
1653         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1654 #endif
1655 err_unreg_subsys:
1656         nfnetlink_subsys_unregister(&ctnl_subsys);
1657 err_out:
1658         return ret;
1659 }
1660
1661 static void __exit ctnetlink_exit(void)
1662 {
1663         printk("ctnetlink: unregistering from nfnetlink.\n");
1664
1665 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1666         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1667         nf_conntrack_unregister_notifier(&ctnl_notifier);
1668 #endif
1669
1670         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1671         nfnetlink_subsys_unregister(&ctnl_subsys);
1672         return;
1673 }
1674
1675 module_init(ctnetlink_init);
1676 module_exit(ctnetlink_exit);