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