[NETFILTER]: nf_conntrack: endian annotations
[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  * I've reworked this stuff to use attributes instead of conntrack 
10  * structures. 5.44 am. I need more tea. --pablo 05/07/11.
11  *
12  * Initial connection tracking via netlink development funded and 
13  * generally made possible by Network Robots, Inc. (www.networkrobots.com)
14  *
15  * Further development of this code funded by Astaro AG (http://www.astaro.com)
16  *
17  * This software may be used and distributed according to the terms
18  * of the GNU General Public License, incorporated herein by reference.
19  *
20  * Derived from ip_conntrack_netlink.c: Port by Pablo Neira Ayuso (05/11/14)
21  */
22
23 #include <linux/init.h>
24 #include <linux/module.h>
25 #include <linux/kernel.h>
26 #include <linux/types.h>
27 #include <linux/timer.h>
28 #include <linux/skbuff.h>
29 #include <linux/errno.h>
30 #include <linux/netlink.h>
31 #include <linux/spinlock.h>
32 #include <linux/interrupt.h>
33 #include <linux/notifier.h>
34
35 #include <linux/netfilter.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_core.h>
38 #include <net/netfilter/nf_conntrack_expect.h>
39 #include <net/netfilter/nf_conntrack_helper.h>
40 #include <net/netfilter/nf_conntrack_l3proto.h>
41 #include <net/netfilter/nf_conntrack_l4proto.h>
42 #include <linux/netfilter_ipv4/ip_nat_protocol.h>
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
175         if (!help || !help->helper)
176                 return 0;
177                 
178         nest_helper = NFA_NEST(skb, CTA_HELP);
179         NFA_PUT(skb, CTA_HELP_NAME, strlen(help->helper->name), help->helper->name);
180
181         if (help->helper->to_nfattr)
182                 help->helper->to_nfattr(skb, ct);
183
184         NFA_NEST_END(skb, nest_helper);
185
186         return 0;
187
188 nfattr_failure:
189         return -1;
190 }
191
192 #ifdef CONFIG_NF_CT_ACCT
193 static inline int
194 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
195                         enum ip_conntrack_dir dir)
196 {
197         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
198         struct nfattr *nest_count = NFA_NEST(skb, type);
199         __be32 tmp;
200
201         tmp = htonl(ct->counters[dir].packets);
202         NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
203
204         tmp = htonl(ct->counters[dir].bytes);
205         NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
206
207         NFA_NEST_END(skb, nest_count);
208
209         return 0;
210
211 nfattr_failure:
212         return -1;
213 }
214 #else
215 #define ctnetlink_dump_counters(a, b, c) (0)
216 #endif
217
218 #ifdef CONFIG_NF_CONNTRACK_MARK
219 static inline int
220 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
221 {
222         __be32 mark = htonl(ct->mark);
223
224         NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
225         return 0;
226
227 nfattr_failure:
228         return -1;
229 }
230 #else
231 #define ctnetlink_dump_mark(a, b) (0)
232 #endif
233
234 static inline int
235 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
236 {
237         __be32 id = htonl(ct->id);
238         NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
239         return 0;
240
241 nfattr_failure:
242         return -1;
243 }
244
245 static inline int
246 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
247 {
248         __be32 use = htonl(atomic_read(&ct->ct_general.use));
249         
250         NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
251         return 0;
252
253 nfattr_failure:
254         return -1;
255 }
256
257 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
258
259 static int
260 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
261                     int event, int nowait, 
262                     const struct nf_conn *ct)
263 {
264         struct nlmsghdr *nlh;
265         struct nfgenmsg *nfmsg;
266         struct nfattr *nest_parms;
267         unsigned char *b;
268
269         b = skb->tail;
270
271         event |= NFNL_SUBSYS_CTNETLINK << 8;
272         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
273         nfmsg  = NLMSG_DATA(nlh);
274
275         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
276         nfmsg->nfgen_family = 
277                 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
278         nfmsg->version      = NFNETLINK_V0;
279         nfmsg->res_id       = 0;
280
281         nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
282         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
283                 goto nfattr_failure;
284         NFA_NEST_END(skb, nest_parms);
285         
286         nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
287         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
288                 goto nfattr_failure;
289         NFA_NEST_END(skb, nest_parms);
290
291         if (ctnetlink_dump_status(skb, ct) < 0 ||
292             ctnetlink_dump_timeout(skb, ct) < 0 ||
293             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
294             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
295             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
296             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
297             ctnetlink_dump_mark(skb, ct) < 0 ||
298             ctnetlink_dump_id(skb, ct) < 0 ||
299             ctnetlink_dump_use(skb, ct) < 0)
300                 goto nfattr_failure;
301
302         nlh->nlmsg_len = skb->tail - b;
303         return skb->len;
304
305 nlmsg_failure:
306 nfattr_failure:
307         skb_trim(skb, b - skb->data);
308         return -1;
309 }
310
311 #ifdef CONFIG_NF_CONNTRACK_EVENTS
312 static int ctnetlink_conntrack_event(struct notifier_block *this,
313                                      unsigned long events, void *ptr)
314 {
315         struct nlmsghdr *nlh;
316         struct nfgenmsg *nfmsg;
317         struct nfattr *nest_parms;
318         struct nf_conn *ct = (struct nf_conn *)ptr;
319         struct sk_buff *skb;
320         unsigned int type;
321         unsigned char *b;
322         unsigned int flags = 0, group;
323
324         /* ignore our fake conntrack entry */
325         if (ct == &nf_conntrack_untracked)
326                 return NOTIFY_DONE;
327
328         if (events & IPCT_DESTROY) {
329                 type = IPCTNL_MSG_CT_DELETE;
330                 group = NFNLGRP_CONNTRACK_DESTROY;
331         } else  if (events & (IPCT_NEW | IPCT_RELATED)) {
332                 type = IPCTNL_MSG_CT_NEW;
333                 flags = NLM_F_CREATE|NLM_F_EXCL;
334                 group = NFNLGRP_CONNTRACK_NEW;
335         } else  if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
336                 type = IPCTNL_MSG_CT_NEW;
337                 group = NFNLGRP_CONNTRACK_UPDATE;
338         } else
339                 return NOTIFY_DONE;
340
341         if (!nfnetlink_has_listeners(group))
342                 return NOTIFY_DONE;
343
344         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
345         if (!skb)
346                 return NOTIFY_DONE;
347
348         b = skb->tail;
349
350         type |= NFNL_SUBSYS_CTNETLINK << 8;
351         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
352         nfmsg = NLMSG_DATA(nlh);
353
354         nlh->nlmsg_flags    = flags;
355         nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
356         nfmsg->version  = NFNETLINK_V0;
357         nfmsg->res_id   = 0;
358
359         nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
360         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
361                 goto nfattr_failure;
362         NFA_NEST_END(skb, nest_parms);
363         
364         nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
365         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
366                 goto nfattr_failure;
367         NFA_NEST_END(skb, nest_parms);
368
369         if (events & IPCT_DESTROY) {
370                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
371                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
372                         goto nfattr_failure;
373         } else {
374                 if (ctnetlink_dump_status(skb, ct) < 0)
375                         goto nfattr_failure;
376
377                 if (ctnetlink_dump_timeout(skb, ct) < 0)
378                         goto nfattr_failure;
379
380                 if (events & IPCT_PROTOINFO
381                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
382                         goto nfattr_failure;
383
384                 if ((events & IPCT_HELPER || nfct_help(ct))
385                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
386                         goto nfattr_failure;
387
388                 if ((events & IPCT_MARK || ct->mark)
389                     && ctnetlink_dump_mark(skb, ct) < 0)
390                         goto nfattr_failure;
391
392                 if (events & IPCT_COUNTER_FILLING &&
393                     (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
394                      ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
395                         goto nfattr_failure;
396         }
397
398         nlh->nlmsg_len = skb->tail - b;
399         nfnetlink_send(skb, 0, group, 0);
400         return NOTIFY_DONE;
401
402 nlmsg_failure:
403 nfattr_failure:
404         kfree_skb(skb);
405         return NOTIFY_DONE;
406 }
407 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
408
409 static int ctnetlink_done(struct netlink_callback *cb)
410 {
411         if (cb->args[1])
412                 nf_ct_put((struct nf_conn *)cb->args[1]);
413         return 0;
414 }
415
416 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
417
418 static int
419 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
420 {
421         struct nf_conn *ct, *last;
422         struct nf_conntrack_tuple_hash *h;
423         struct list_head *i;
424         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
425         u_int8_t l3proto = nfmsg->nfgen_family;
426
427         read_lock_bh(&nf_conntrack_lock);
428         last = (struct nf_conn *)cb->args[1];
429         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
430 restart:
431                 list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
432                         h = (struct nf_conntrack_tuple_hash *) i;
433                         if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
434                                 continue;
435                         ct = nf_ct_tuplehash_to_ctrack(h);
436                         /* Dump entries of a given L3 protocol number.
437                          * If it is not specified, ie. l3proto == 0,
438                          * then dump everything. */
439                         if (l3proto && L3PROTO(ct) != l3proto)
440                                 continue;
441                         if (cb->args[1]) {
442                                 if (ct != last)
443                                         continue;
444                                 cb->args[1] = 0;
445                         }
446                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
447                                                 cb->nlh->nlmsg_seq,
448                                                 IPCTNL_MSG_CT_NEW,
449                                                 1, ct) < 0) {
450                                 nf_conntrack_get(&ct->ct_general);
451                                 cb->args[1] = (unsigned long)ct;
452                                 goto out;
453                         }
454 #ifdef CONFIG_NF_CT_ACCT
455                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
456                                                 IPCTNL_MSG_CT_GET_CTRZERO)
457                                 memset(&ct->counters, 0, sizeof(ct->counters));
458 #endif
459                 }
460                 if (cb->args[1]) {
461                         cb->args[1] = 0;
462                         goto restart;
463                 }
464         }
465 out:
466         read_unlock_bh(&nf_conntrack_lock);
467         if (last)
468                 nf_ct_put(last);
469
470         return skb->len;
471 }
472
473 static inline int
474 ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple)
475 {
476         struct nfattr *tb[CTA_IP_MAX];
477         struct nf_conntrack_l3proto *l3proto;
478         int ret = 0;
479
480         nfattr_parse_nested(tb, CTA_IP_MAX, attr);
481
482         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
483
484         if (likely(l3proto->nfattr_to_tuple))
485                 ret = l3proto->nfattr_to_tuple(tb, tuple);
486
487         nf_ct_l3proto_put(l3proto);
488
489         return ret;
490 }
491
492 static const size_t cta_min_proto[CTA_PROTO_MAX] = {
493         [CTA_PROTO_NUM-1]       = sizeof(u_int8_t),
494 };
495
496 static inline int
497 ctnetlink_parse_tuple_proto(struct nfattr *attr, 
498                             struct nf_conntrack_tuple *tuple)
499 {
500         struct nfattr *tb[CTA_PROTO_MAX];
501         struct nf_conntrack_l4proto *l4proto;
502         int ret = 0;
503
504         nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
505
506         if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
507                 return -EINVAL;
508
509         if (!tb[CTA_PROTO_NUM-1])
510                 return -EINVAL;
511         tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
512
513         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
514
515         if (likely(l4proto->nfattr_to_tuple))
516                 ret = l4proto->nfattr_to_tuple(tb, tuple);
517
518         nf_ct_l4proto_put(l4proto);
519         
520         return ret;
521 }
522
523 static inline int
524 ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple,
525                       enum ctattr_tuple type, u_int8_t l3num)
526 {
527         struct nfattr *tb[CTA_TUPLE_MAX];
528         int err;
529
530         memset(tuple, 0, sizeof(*tuple));
531
532         nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
533
534         if (!tb[CTA_TUPLE_IP-1])
535                 return -EINVAL;
536
537         tuple->src.l3num = l3num;
538
539         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
540         if (err < 0)
541                 return err;
542
543         if (!tb[CTA_TUPLE_PROTO-1])
544                 return -EINVAL;
545
546         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
547         if (err < 0)
548                 return err;
549
550         /* orig and expect tuples get DIR_ORIGINAL */
551         if (type == CTA_TUPLE_REPLY)
552                 tuple->dst.dir = IP_CT_DIR_REPLY;
553         else
554                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
555
556         return 0;
557 }
558
559 #ifdef CONFIG_IP_NF_NAT_NEEDED
560 static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
561         [CTA_PROTONAT_PORT_MIN-1]       = sizeof(u_int16_t),
562         [CTA_PROTONAT_PORT_MAX-1]       = sizeof(u_int16_t),
563 };
564
565 static int ctnetlink_parse_nat_proto(struct nfattr *attr,
566                                      const struct nf_conn *ct,
567                                      struct ip_nat_range *range)
568 {
569         struct nfattr *tb[CTA_PROTONAT_MAX];
570         struct ip_nat_protocol *npt;
571
572         nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
573
574         if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
575                 return -EINVAL;
576
577         npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
578
579         if (!npt->nfattr_to_range) {
580                 ip_nat_proto_put(npt);
581                 return 0;
582         }
583
584         /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
585         if (npt->nfattr_to_range(tb, range) > 0)
586                 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
587
588         ip_nat_proto_put(npt);
589
590         return 0;
591 }
592
593 static const size_t cta_min_nat[CTA_NAT_MAX] = {
594         [CTA_NAT_MINIP-1]       = sizeof(u_int32_t),
595         [CTA_NAT_MAXIP-1]       = sizeof(u_int32_t),
596 };
597
598 static inline int
599 ctnetlink_parse_nat(struct nfattr *nat,
600                     const struct nf_conn *ct, struct ip_nat_range *range)
601 {
602         struct nfattr *tb[CTA_NAT_MAX];
603         int err;
604
605         memset(range, 0, sizeof(*range));
606         
607         nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
608
609         if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
610                 return -EINVAL;
611
612         if (tb[CTA_NAT_MINIP-1])
613                 range->min_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
614
615         if (!tb[CTA_NAT_MAXIP-1])
616                 range->max_ip = range->min_ip;
617         else
618                 range->max_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
619
620         if (range->min_ip)
621                 range->flags |= IP_NAT_RANGE_MAP_IPS;
622
623         if (!tb[CTA_NAT_PROTO-1])
624                 return 0;
625
626         err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
627         if (err < 0)
628                 return err;
629
630         return 0;
631 }
632 #endif
633
634 static inline int
635 ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
636 {
637         struct nfattr *tb[CTA_HELP_MAX];
638
639         nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
640
641         if (!tb[CTA_HELP_NAME-1])
642                 return -EINVAL;
643
644         *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
645
646         return 0;
647 }
648
649 static const size_t cta_min[CTA_MAX] = {
650         [CTA_STATUS-1]          = sizeof(u_int32_t),
651         [CTA_TIMEOUT-1]         = sizeof(u_int32_t),
652         [CTA_MARK-1]            = sizeof(u_int32_t),
653         [CTA_USE-1]             = sizeof(u_int32_t),
654         [CTA_ID-1]              = sizeof(u_int32_t)
655 };
656
657 static int
658 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb, 
659                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
660 {
661         struct nf_conntrack_tuple_hash *h;
662         struct nf_conntrack_tuple tuple;
663         struct nf_conn *ct;
664         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
665         u_int8_t u3 = nfmsg->nfgen_family;
666         int err = 0;
667
668         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
669                 return -EINVAL;
670
671         if (cda[CTA_TUPLE_ORIG-1])
672                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
673         else if (cda[CTA_TUPLE_REPLY-1])
674                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
675         else {
676                 /* Flush the whole table */
677                 nf_conntrack_flush();
678                 return 0;
679         }
680
681         if (err < 0)
682                 return err;
683
684         h = nf_conntrack_find_get(&tuple, NULL);
685         if (!h)
686                 return -ENOENT;
687
688         ct = nf_ct_tuplehash_to_ctrack(h);
689         
690         if (cda[CTA_ID-1]) {
691                 u_int32_t id = ntohl(*(__be32 *)NFA_DATA(cda[CTA_ID-1]));
692                 if (ct->id != id) {
693                         nf_ct_put(ct);
694                         return -ENOENT;
695                 }
696         }       
697         if (del_timer(&ct->timeout))
698                 ct->timeout.function((unsigned long)ct);
699
700         nf_ct_put(ct);
701
702         return 0;
703 }
704
705 static int
706 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb, 
707                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
708 {
709         struct nf_conntrack_tuple_hash *h;
710         struct nf_conntrack_tuple tuple;
711         struct nf_conn *ct;
712         struct sk_buff *skb2 = NULL;
713         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
714         u_int8_t u3 = nfmsg->nfgen_family;
715         int err = 0;
716
717         if (nlh->nlmsg_flags & NLM_F_DUMP) {
718                 u32 rlen;
719
720 #ifndef CONFIG_NF_CT_ACCT
721                 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
722                         return -ENOTSUPP;
723 #endif
724                 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
725                                                 ctnetlink_dump_table,
726                                                 ctnetlink_done)) != 0)
727                         return -EINVAL;
728
729                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
730                 if (rlen > skb->len)
731                         rlen = skb->len;
732                 skb_pull(skb, rlen);
733                 return 0;
734         }
735
736         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
737                 return -EINVAL;
738
739         if (cda[CTA_TUPLE_ORIG-1])
740                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
741         else if (cda[CTA_TUPLE_REPLY-1])
742                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
743         else
744                 return -EINVAL;
745
746         if (err < 0)
747                 return err;
748
749         h = nf_conntrack_find_get(&tuple, NULL);
750         if (!h)
751                 return -ENOENT;
752
753         ct = nf_ct_tuplehash_to_ctrack(h);
754
755         err = -ENOMEM;
756         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
757         if (!skb2) {
758                 nf_ct_put(ct);
759                 return -ENOMEM;
760         }
761
762         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 
763                                   IPCTNL_MSG_CT_NEW, 1, ct);
764         nf_ct_put(ct);
765         if (err <= 0)
766                 goto free;
767
768         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
769         if (err < 0)
770                 goto out;
771
772         return 0;
773
774 free:
775         kfree_skb(skb2);
776 out:
777         return err;
778 }
779
780 static inline int
781 ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[])
782 {
783         unsigned long d;
784         unsigned int status = ntohl(*(__be32 *)NFA_DATA(cda[CTA_STATUS-1]));
785         d = ct->status ^ status;
786
787         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
788                 /* unchangeable */
789                 return -EINVAL;
790         
791         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
792                 /* SEEN_REPLY bit can only be set */
793                 return -EINVAL;
794
795         
796         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
797                 /* ASSURED bit can only be set */
798                 return -EINVAL;
799
800         if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
801 #ifndef CONFIG_IP_NF_NAT_NEEDED
802                 return -EINVAL;
803 #else
804                 struct ip_nat_range range;
805
806                 if (cda[CTA_NAT_DST-1]) {
807                         if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
808                                                 &range) < 0)
809                                 return -EINVAL;
810                         if (ip_nat_initialized(ct,
811                                                HOOK2MANIP(NF_IP_PRE_ROUTING)))
812                                 return -EEXIST;
813                         ip_nat_setup_info(ct, &range, hooknum);
814                 }
815                 if (cda[CTA_NAT_SRC-1]) {
816                         if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
817                                                 &range) < 0)
818                                 return -EINVAL;
819                         if (ip_nat_initialized(ct,
820                                                HOOK2MANIP(NF_IP_POST_ROUTING)))
821                                 return -EEXIST;
822                         ip_nat_setup_info(ct, &range, hooknum);
823                 }
824 #endif
825         }
826
827         /* Be careful here, modifying NAT bits can screw up things,
828          * so don't let users modify them directly if they don't pass
829          * ip_nat_range. */
830         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
831         return 0;
832 }
833
834
835 static inline int
836 ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[])
837 {
838         struct nf_conntrack_helper *helper;
839         struct nf_conn_help *help = nfct_help(ct);
840         char *helpname;
841         int err;
842
843         if (!help) {
844                 /* FIXME: we need to reallocate and rehash */
845                 return -EBUSY;
846         }
847
848         /* don't change helper of sibling connections */
849         if (ct->master)
850                 return -EINVAL;
851
852         err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
853         if (err < 0)
854                 return err;
855
856         helper = __nf_conntrack_helper_find_byname(helpname);
857         if (!helper) {
858                 if (!strcmp(helpname, ""))
859                         helper = NULL;
860                 else
861                         return -EINVAL;
862         }
863
864         if (help->helper) {
865                 if (!helper) {
866                         /* we had a helper before ... */
867                         nf_ct_remove_expectations(ct);
868                         help->helper = NULL;
869                 } else {
870                         /* need to zero data of old helper */
871                         memset(&help->help, 0, sizeof(help->help));
872                 }
873         }
874         
875         help->helper = helper;
876
877         return 0;
878 }
879
880 static inline int
881 ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[])
882 {
883         u_int32_t timeout = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
884         
885         if (!del_timer(&ct->timeout))
886                 return -ETIME;
887
888         ct->timeout.expires = jiffies + timeout * HZ;
889         add_timer(&ct->timeout);
890
891         return 0;
892 }
893
894 static inline int
895 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[])
896 {
897         struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
898         struct nf_conntrack_l4proto *l4proto;
899         u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
900         u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
901         int err = 0;
902
903         nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
904
905         l4proto = nf_ct_l4proto_find_get(l3num, npt);
906
907         if (l4proto->from_nfattr)
908                 err = l4proto->from_nfattr(tb, ct);
909         nf_ct_l4proto_put(l4proto);
910
911         return err;
912 }
913
914 static int
915 ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[])
916 {
917         int err;
918
919         if (cda[CTA_HELP-1]) {
920                 err = ctnetlink_change_helper(ct, cda);
921                 if (err < 0)
922                         return err;
923         }
924
925         if (cda[CTA_TIMEOUT-1]) {
926                 err = ctnetlink_change_timeout(ct, cda);
927                 if (err < 0)
928                         return err;
929         }
930
931         if (cda[CTA_STATUS-1]) {
932                 err = ctnetlink_change_status(ct, cda);
933                 if (err < 0)
934                         return err;
935         }
936
937         if (cda[CTA_PROTOINFO-1]) {
938                 err = ctnetlink_change_protoinfo(ct, cda);
939                 if (err < 0)
940                         return err;
941         }
942
943 #if defined(CONFIG_NF_CONNTRACK_MARK)
944         if (cda[CTA_MARK-1])
945                 ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
946 #endif
947
948         return 0;
949 }
950
951 static int
952 ctnetlink_create_conntrack(struct nfattr *cda[], 
953                            struct nf_conntrack_tuple *otuple,
954                            struct nf_conntrack_tuple *rtuple)
955 {
956         struct nf_conn *ct;
957         int err = -EINVAL;
958         struct nf_conn_help *help;
959
960         ct = nf_conntrack_alloc(otuple, rtuple);
961         if (ct == NULL || IS_ERR(ct))
962                 return -ENOMEM; 
963
964         if (!cda[CTA_TIMEOUT-1])
965                 goto err;
966         ct->timeout.expires = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
967
968         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
969         ct->status |= IPS_CONFIRMED;
970
971         if (cda[CTA_STATUS-1]) {
972                 err = ctnetlink_change_status(ct, cda);
973                 if (err < 0)
974                         goto err;
975         }
976
977         if (cda[CTA_PROTOINFO-1]) {
978                 err = ctnetlink_change_protoinfo(ct, cda);
979                 if (err < 0)
980                         return err;
981         }
982
983 #if defined(CONFIG_NF_CONNTRACK_MARK)
984         if (cda[CTA_MARK-1])
985                 ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
986 #endif
987
988         help = nfct_help(ct);
989         if (help)
990                 help->helper = nf_ct_helper_find_get(rtuple);
991
992         add_timer(&ct->timeout);
993         nf_conntrack_hash_insert(ct);
994
995         if (help && help->helper)
996                 nf_ct_helper_put(help->helper);
997
998         return 0;
999
1000 err:    
1001         nf_conntrack_free(ct);
1002         return err;
1003 }
1004
1005 static int 
1006 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb, 
1007                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1008 {
1009         struct nf_conntrack_tuple otuple, rtuple;
1010         struct nf_conntrack_tuple_hash *h = NULL;
1011         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1012         u_int8_t u3 = nfmsg->nfgen_family;
1013         int err = 0;
1014
1015         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
1016                 return -EINVAL;
1017
1018         if (cda[CTA_TUPLE_ORIG-1]) {
1019                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1020                 if (err < 0)
1021                         return err;
1022         }
1023
1024         if (cda[CTA_TUPLE_REPLY-1]) {
1025                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1026                 if (err < 0)
1027                         return err;
1028         }
1029
1030         write_lock_bh(&nf_conntrack_lock);
1031         if (cda[CTA_TUPLE_ORIG-1])
1032                 h = __nf_conntrack_find(&otuple, NULL);
1033         else if (cda[CTA_TUPLE_REPLY-1])
1034                 h = __nf_conntrack_find(&rtuple, NULL);
1035
1036         if (h == NULL) {
1037                 write_unlock_bh(&nf_conntrack_lock);
1038                 err = -ENOENT;
1039                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1040                         err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
1041                 return err;
1042         }
1043         /* implicit 'else' */
1044
1045         /* we only allow nat config for new conntracks */
1046         if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
1047                 err = -EINVAL;
1048                 goto out_unlock;
1049         }
1050
1051         /* We manipulate the conntrack inside the global conntrack table lock,
1052          * so there's no need to increase the refcount */
1053         err = -EEXIST;
1054         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1055                 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda);
1056
1057 out_unlock:
1058         write_unlock_bh(&nf_conntrack_lock);
1059         return err;
1060 }
1061
1062 /*********************************************************************** 
1063  * EXPECT 
1064  ***********************************************************************/ 
1065
1066 static inline int
1067 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1068                          const struct nf_conntrack_tuple *tuple,
1069                          enum ctattr_expect type)
1070 {
1071         struct nfattr *nest_parms = NFA_NEST(skb, type);
1072         
1073         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1074                 goto nfattr_failure;
1075
1076         NFA_NEST_END(skb, nest_parms);
1077
1078         return 0;
1079
1080 nfattr_failure:
1081         return -1;
1082 }                       
1083
1084 static inline int
1085 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1086                         const struct nf_conntrack_tuple *tuple,
1087                         const struct nf_conntrack_tuple *mask)
1088 {
1089         int ret;
1090         struct nf_conntrack_l3proto *l3proto;
1091         struct nf_conntrack_l4proto *l4proto;
1092         struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
1093
1094         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1095         ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto);
1096         nf_ct_l3proto_put(l3proto);
1097
1098         if (unlikely(ret < 0))
1099                 goto nfattr_failure;
1100
1101         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1102         ret = ctnetlink_dump_tuples_proto(skb, mask, l4proto);
1103         nf_ct_l4proto_put(l4proto);
1104         if (unlikely(ret < 0))
1105                 goto nfattr_failure;
1106
1107         NFA_NEST_END(skb, nest_parms);
1108
1109         return 0;
1110
1111 nfattr_failure:
1112         return -1;
1113 }
1114
1115 static inline int
1116 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1117                           const struct nf_conntrack_expect *exp)
1118 {
1119         struct nf_conn *master = exp->master;
1120         __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1121         __be32 id = htonl(exp->id);
1122
1123         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1124                 goto nfattr_failure;
1125         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1126                 goto nfattr_failure;
1127         if (ctnetlink_exp_dump_tuple(skb,
1128                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1129                                  CTA_EXPECT_MASTER) < 0)
1130                 goto nfattr_failure;
1131         
1132         NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1133         NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1134
1135         return 0;
1136         
1137 nfattr_failure:
1138         return -1;
1139 }
1140
1141 static int
1142 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1143                     int event, 
1144                     int nowait, 
1145                     const struct nf_conntrack_expect *exp)
1146 {
1147         struct nlmsghdr *nlh;
1148         struct nfgenmsg *nfmsg;
1149         unsigned char *b;
1150
1151         b = skb->tail;
1152
1153         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1154         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1155         nfmsg  = NLMSG_DATA(nlh);
1156
1157         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1158         nfmsg->nfgen_family = exp->tuple.src.l3num;
1159         nfmsg->version      = NFNETLINK_V0;
1160         nfmsg->res_id       = 0;
1161
1162         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1163                 goto nfattr_failure;
1164
1165         nlh->nlmsg_len = skb->tail - b;
1166         return skb->len;
1167
1168 nlmsg_failure:
1169 nfattr_failure:
1170         skb_trim(skb, b - skb->data);
1171         return -1;
1172 }
1173
1174 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1175 static int ctnetlink_expect_event(struct notifier_block *this,
1176                                   unsigned long events, void *ptr)
1177 {
1178         struct nlmsghdr *nlh;
1179         struct nfgenmsg *nfmsg;
1180         struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1181         struct sk_buff *skb;
1182         unsigned int type;
1183         unsigned char *b;
1184         int flags = 0;
1185
1186         if (events & IPEXP_NEW) {
1187                 type = IPCTNL_MSG_EXP_NEW;
1188                 flags = NLM_F_CREATE|NLM_F_EXCL;
1189         } else
1190                 return NOTIFY_DONE;
1191
1192         if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1193                 return NOTIFY_DONE;
1194
1195         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1196         if (!skb)
1197                 return NOTIFY_DONE;
1198
1199         b = skb->tail;
1200
1201         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1202         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1203         nfmsg = NLMSG_DATA(nlh);
1204
1205         nlh->nlmsg_flags    = flags;
1206         nfmsg->nfgen_family = exp->tuple.src.l3num;
1207         nfmsg->version      = NFNETLINK_V0;
1208         nfmsg->res_id       = 0;
1209
1210         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1211                 goto nfattr_failure;
1212
1213         nlh->nlmsg_len = skb->tail - b;
1214         nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1215         return NOTIFY_DONE;
1216
1217 nlmsg_failure:
1218 nfattr_failure:
1219         kfree_skb(skb);
1220         return NOTIFY_DONE;
1221 }
1222 #endif
1223
1224 static int
1225 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1226 {
1227         struct nf_conntrack_expect *exp = NULL;
1228         struct list_head *i;
1229         u_int32_t *id = (u_int32_t *) &cb->args[0];
1230         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1231         u_int8_t l3proto = nfmsg->nfgen_family;
1232
1233         read_lock_bh(&nf_conntrack_lock);
1234         list_for_each_prev(i, &nf_conntrack_expect_list) {
1235                 exp = (struct nf_conntrack_expect *) i;
1236                 if (l3proto && exp->tuple.src.l3num != l3proto)
1237                         continue;
1238                 if (exp->id <= *id)
1239                         continue;
1240                 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1241                                             cb->nlh->nlmsg_seq,
1242                                             IPCTNL_MSG_EXP_NEW,
1243                                             1, exp) < 0)
1244                         goto out;
1245                 *id = exp->id;
1246         }
1247 out:    
1248         read_unlock_bh(&nf_conntrack_lock);
1249
1250         return skb->len;
1251 }
1252
1253 static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
1254         [CTA_EXPECT_TIMEOUT-1]          = sizeof(u_int32_t),
1255         [CTA_EXPECT_ID-1]               = sizeof(u_int32_t)
1256 };
1257
1258 static int
1259 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb, 
1260                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1261 {
1262         struct nf_conntrack_tuple tuple;
1263         struct nf_conntrack_expect *exp;
1264         struct sk_buff *skb2;
1265         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1266         u_int8_t u3 = nfmsg->nfgen_family;
1267         int err = 0;
1268
1269         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1270                 return -EINVAL;
1271
1272         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1273                 u32 rlen;
1274
1275                 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
1276                                                 ctnetlink_exp_dump_table,
1277                                                 ctnetlink_done)) != 0)
1278                         return -EINVAL;
1279                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1280                 if (rlen > skb->len)
1281                         rlen = skb->len;
1282                 skb_pull(skb, rlen);
1283                 return 0;
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_conntrack_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_conntrack_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_conntrack_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_conntrack_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[], int *errp)
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_conntrack_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_conntrack_expect_put(exp);
1357                                 return -ENOENT;
1358                         }
1359                 }
1360
1361                 /* after list removal, usage count == 1 */
1362                 nf_conntrack_unexpect_related(exp);
1363                 /* have to put what we 'get' above. 
1364                  * after this line usage count == 0 */
1365                 nf_conntrack_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_conntrack_expect_list,
1377                                          list) {
1378                         struct nf_conn_help *m_help = nfct_help(exp->master);
1379                         if (m_help->helper == h
1380                             && del_timer(&exp->timeout)) {
1381                                 nf_ct_unlink_expect(exp);
1382                                 nf_conntrack_expect_put(exp);
1383                         }
1384                 }
1385                 write_unlock_bh(&nf_conntrack_lock);
1386         } else {
1387                 /* This basically means we have to flush everything*/
1388                 write_lock_bh(&nf_conntrack_lock);
1389                 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1390                                          list) {
1391                         if (del_timer(&exp->timeout)) {
1392                                 nf_ct_unlink_expect(exp);
1393                                 nf_conntrack_expect_put(exp);
1394                         }
1395                 }
1396                 write_unlock_bh(&nf_conntrack_lock);
1397         }
1398
1399         return 0;
1400 }
1401 static int
1402 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[])
1403 {
1404         return -EOPNOTSUPP;
1405 }
1406
1407 static int
1408 ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3)
1409 {
1410         struct nf_conntrack_tuple tuple, mask, master_tuple;
1411         struct nf_conntrack_tuple_hash *h = NULL;
1412         struct nf_conntrack_expect *exp;
1413         struct nf_conn *ct;
1414         struct nf_conn_help *help;
1415         int err = 0;
1416
1417         /* caller guarantees that those three CTA_EXPECT_* exist */
1418         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1419         if (err < 0)
1420                 return err;
1421         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1422         if (err < 0)
1423                 return err;
1424         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1425         if (err < 0)
1426                 return err;
1427
1428         /* Look for master conntrack of this expectation */
1429         h = nf_conntrack_find_get(&master_tuple, NULL);
1430         if (!h)
1431                 return -ENOENT;
1432         ct = nf_ct_tuplehash_to_ctrack(h);
1433         help = nfct_help(ct);
1434
1435         if (!help || !help->helper) {
1436                 /* such conntrack hasn't got any helper, abort */
1437                 err = -EINVAL;
1438                 goto out;
1439         }
1440
1441         exp = nf_conntrack_expect_alloc(ct);
1442         if (!exp) {
1443                 err = -ENOMEM;
1444                 goto out;
1445         }
1446         
1447         exp->expectfn = NULL;
1448         exp->flags = 0;
1449         exp->master = ct;
1450         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1451         memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple));
1452
1453         err = nf_conntrack_expect_related(exp);
1454         nf_conntrack_expect_put(exp);
1455
1456 out:    
1457         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1458         return err;
1459 }
1460
1461 static int
1462 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1463                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1464 {
1465         struct nf_conntrack_tuple tuple;
1466         struct nf_conntrack_expect *exp;
1467         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1468         u_int8_t u3 = nfmsg->nfgen_family;
1469         int err = 0;
1470
1471         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1472                 return -EINVAL;
1473
1474         if (!cda[CTA_EXPECT_TUPLE-1]
1475             || !cda[CTA_EXPECT_MASK-1]
1476             || !cda[CTA_EXPECT_MASTER-1])
1477                 return -EINVAL;
1478
1479         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1480         if (err < 0)
1481                 return err;
1482
1483         write_lock_bh(&nf_conntrack_lock);
1484         exp = __nf_conntrack_expect_find(&tuple);
1485
1486         if (!exp) {
1487                 write_unlock_bh(&nf_conntrack_lock);
1488                 err = -ENOENT;
1489                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1490                         err = ctnetlink_create_expect(cda, u3);
1491                 return err;
1492         }
1493
1494         err = -EEXIST;
1495         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1496                 err = ctnetlink_change_expect(exp, cda);
1497         write_unlock_bh(&nf_conntrack_lock);
1498
1499         return err;
1500 }
1501
1502 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1503 static struct notifier_block ctnl_notifier = {
1504         .notifier_call  = ctnetlink_conntrack_event,
1505 };
1506
1507 static struct notifier_block ctnl_notifier_exp = {
1508         .notifier_call  = ctnetlink_expect_event,
1509 };
1510 #endif
1511
1512 static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1513         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1514                                             .attr_count = CTA_MAX, },
1515         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1516                                             .attr_count = CTA_MAX, },
1517         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1518                                             .attr_count = CTA_MAX, },
1519         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1520                                             .attr_count = CTA_MAX, },
1521 };
1522
1523 static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1524         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1525                                             .attr_count = CTA_EXPECT_MAX, },
1526         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1527                                             .attr_count = CTA_EXPECT_MAX, },
1528         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1529                                             .attr_count = CTA_EXPECT_MAX, },
1530 };
1531
1532 static struct nfnetlink_subsystem ctnl_subsys = {
1533         .name                           = "conntrack",
1534         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1535         .cb_count                       = IPCTNL_MSG_MAX,
1536         .cb                             = ctnl_cb,
1537 };
1538
1539 static struct nfnetlink_subsystem ctnl_exp_subsys = {
1540         .name                           = "conntrack_expect",
1541         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1542         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1543         .cb                             = ctnl_exp_cb,
1544 };
1545
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_conntrack_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_conntrack_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);