[NETFILTER]: x_tables: remove some unnecessary casts
[linux-2.6] / 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/notifier.h>
33
34 #include <linux/netfilter.h>
35 #include <net/netfilter/nf_conntrack.h>
36 #include <net/netfilter/nf_conntrack_core.h>
37 #include <net/netfilter/nf_conntrack_helper.h>
38 #include <net/netfilter/nf_conntrack_l3proto.h>
39 #include <net/netfilter/nf_conntrack_protocol.h>
40 #include <linux/netfilter_ipv4/ip_nat_protocol.h>
41
42 #include <linux/netfilter/nfnetlink.h>
43 #include <linux/netfilter/nfnetlink_conntrack.h>
44
45 MODULE_LICENSE("GPL");
46
47 static char __initdata version[] = "0.93";
48
49 #if 0
50 #define DEBUGP printk
51 #else
52 #define DEBUGP(format, args...)
53 #endif
54
55
56 static inline int
57 ctnetlink_dump_tuples_proto(struct sk_buff *skb, 
58                             const struct nf_conntrack_tuple *tuple,
59                             struct nf_conntrack_protocol *proto)
60 {
61         int ret = 0;
62         struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
63
64         NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
65
66         if (likely(proto->tuple_to_nfattr))
67                 ret = proto->tuple_to_nfattr(skb, tuple);
68         
69         NFA_NEST_END(skb, nest_parms);
70
71         return ret;
72
73 nfattr_failure:
74         return -1;
75 }
76
77 static inline int
78 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
79                          const struct nf_conntrack_tuple *tuple,
80                          struct nf_conntrack_l3proto *l3proto)
81 {
82         int ret = 0;
83         struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
84
85         if (likely(l3proto->tuple_to_nfattr))
86                 ret = l3proto->tuple_to_nfattr(skb, tuple);
87
88         NFA_NEST_END(skb, nest_parms);
89
90         return ret;
91
92 nfattr_failure:
93         return -1;
94 }
95
96 static inline int
97 ctnetlink_dump_tuples(struct sk_buff *skb,
98                       const struct nf_conntrack_tuple *tuple)
99 {
100         int ret;
101         struct nf_conntrack_l3proto *l3proto;
102         struct nf_conntrack_protocol *proto;
103
104         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
105         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
106         nf_ct_l3proto_put(l3proto);
107
108         if (unlikely(ret < 0))
109                 return ret;
110
111         proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
112         ret = ctnetlink_dump_tuples_proto(skb, tuple, proto);
113         nf_ct_proto_put(proto);
114
115         return ret;
116 }
117
118 static inline int
119 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
120 {
121         u_int32_t status = htonl((u_int32_t) ct->status);
122         NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
123         return 0;
124
125 nfattr_failure:
126         return -1;
127 }
128
129 static inline int
130 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
131 {
132         long timeout_l = ct->timeout.expires - jiffies;
133         u_int32_t timeout;
134
135         if (timeout_l < 0)
136                 timeout = 0;
137         else
138                 timeout = htonl(timeout_l / HZ);
139         
140         NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
141         return 0;
142
143 nfattr_failure:
144         return -1;
145 }
146
147 static inline int
148 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
149 {
150         struct nf_conntrack_protocol *proto = nf_ct_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
151         struct nfattr *nest_proto;
152         int ret;
153
154         if (!proto->to_nfattr) {
155                 nf_ct_proto_put(proto);
156                 return 0;
157         }
158         
159         nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
160
161         ret = proto->to_nfattr(skb, nest_proto, ct);
162
163         nf_ct_proto_put(proto);
164
165         NFA_NEST_END(skb, nest_proto);
166
167         return ret;
168
169 nfattr_failure:
170         return -1;
171 }
172
173 static inline int
174 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
175 {
176         struct nfattr *nest_helper;
177         const struct nf_conn_help *help = nfct_help(ct);
178
179         if (!help || !help->helper)
180                 return 0;
181                 
182         nest_helper = NFA_NEST(skb, CTA_HELP);
183         NFA_PUT(skb, CTA_HELP_NAME, strlen(help->helper->name), help->helper->name);
184
185         if (help->helper->to_nfattr)
186                 help->helper->to_nfattr(skb, ct);
187
188         NFA_NEST_END(skb, nest_helper);
189
190         return 0;
191
192 nfattr_failure:
193         return -1;
194 }
195
196 #ifdef CONFIG_NF_CT_ACCT
197 static inline int
198 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
199                         enum ip_conntrack_dir dir)
200 {
201         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
202         struct nfattr *nest_count = NFA_NEST(skb, type);
203         u_int32_t tmp;
204
205         tmp = htonl(ct->counters[dir].packets);
206         NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
207
208         tmp = htonl(ct->counters[dir].bytes);
209         NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
210
211         NFA_NEST_END(skb, nest_count);
212
213         return 0;
214
215 nfattr_failure:
216         return -1;
217 }
218 #else
219 #define ctnetlink_dump_counters(a, b, c) (0)
220 #endif
221
222 #ifdef CONFIG_NF_CONNTRACK_MARK
223 static inline int
224 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
225 {
226         u_int32_t mark = htonl(ct->mark);
227
228         NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
229         return 0;
230
231 nfattr_failure:
232         return -1;
233 }
234 #else
235 #define ctnetlink_dump_mark(a, b) (0)
236 #endif
237
238 static inline int
239 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
240 {
241         u_int32_t id = htonl(ct->id);
242         NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
243         return 0;
244
245 nfattr_failure:
246         return -1;
247 }
248
249 static inline int
250 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
251 {
252         u_int32_t use = htonl(atomic_read(&ct->ct_general.use));
253         
254         NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
255         return 0;
256
257 nfattr_failure:
258         return -1;
259 }
260
261 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
262
263 static int
264 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
265                     int event, int nowait, 
266                     const struct nf_conn *ct)
267 {
268         struct nlmsghdr *nlh;
269         struct nfgenmsg *nfmsg;
270         struct nfattr *nest_parms;
271         unsigned char *b;
272
273         b = skb->tail;
274
275         event |= NFNL_SUBSYS_CTNETLINK << 8;
276         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
277         nfmsg  = NLMSG_DATA(nlh);
278
279         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
280         nfmsg->nfgen_family = 
281                 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
282         nfmsg->version      = NFNETLINK_V0;
283         nfmsg->res_id       = 0;
284
285         nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
286         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
287                 goto nfattr_failure;
288         NFA_NEST_END(skb, nest_parms);
289         
290         nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
291         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
292                 goto nfattr_failure;
293         NFA_NEST_END(skb, nest_parms);
294
295         if (ctnetlink_dump_status(skb, ct) < 0 ||
296             ctnetlink_dump_timeout(skb, ct) < 0 ||
297             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
298             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
299             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
300             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
301             ctnetlink_dump_mark(skb, ct) < 0 ||
302             ctnetlink_dump_id(skb, ct) < 0 ||
303             ctnetlink_dump_use(skb, ct) < 0)
304                 goto nfattr_failure;
305
306         nlh->nlmsg_len = skb->tail - b;
307         return skb->len;
308
309 nlmsg_failure:
310 nfattr_failure:
311         skb_trim(skb, b - skb->data);
312         return -1;
313 }
314
315 #ifdef CONFIG_NF_CONNTRACK_EVENTS
316 static int ctnetlink_conntrack_event(struct notifier_block *this,
317                                      unsigned long events, void *ptr)
318 {
319         struct nlmsghdr *nlh;
320         struct nfgenmsg *nfmsg;
321         struct nfattr *nest_parms;
322         struct nf_conn *ct = (struct nf_conn *)ptr;
323         struct sk_buff *skb;
324         unsigned int type;
325         unsigned char *b;
326         unsigned int flags = 0, group;
327
328         /* ignore our fake conntrack entry */
329         if (ct == &nf_conntrack_untracked)
330                 return NOTIFY_DONE;
331
332         if (events & IPCT_DESTROY) {
333                 type = IPCTNL_MSG_CT_DELETE;
334                 group = NFNLGRP_CONNTRACK_DESTROY;
335         } else  if (events & (IPCT_NEW | IPCT_RELATED)) {
336                 type = IPCTNL_MSG_CT_NEW;
337                 flags = NLM_F_CREATE|NLM_F_EXCL;
338                 /* dump everything */
339                 events = ~0UL;
340                 group = NFNLGRP_CONNTRACK_NEW;
341         } else  if (events & (IPCT_STATUS |
342                       IPCT_PROTOINFO |
343                       IPCT_HELPER |
344                       IPCT_HELPINFO |
345                       IPCT_NATINFO)) {
346                 type = IPCTNL_MSG_CT_NEW;
347                 group = NFNLGRP_CONNTRACK_UPDATE;
348         } else
349                 return NOTIFY_DONE;
350
351         if (!nfnetlink_has_listeners(group))
352                 return NOTIFY_DONE;
353
354         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
355         if (!skb)
356                 return NOTIFY_DONE;
357
358         b = skb->tail;
359
360         type |= NFNL_SUBSYS_CTNETLINK << 8;
361         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
362         nfmsg = NLMSG_DATA(nlh);
363
364         nlh->nlmsg_flags    = flags;
365         nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
366         nfmsg->version  = NFNETLINK_V0;
367         nfmsg->res_id   = 0;
368
369         nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
370         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
371                 goto nfattr_failure;
372         NFA_NEST_END(skb, nest_parms);
373         
374         nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
375         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
376                 goto nfattr_failure;
377         NFA_NEST_END(skb, nest_parms);
378         
379         /* NAT stuff is now a status flag */
380         if ((events & IPCT_STATUS || events & IPCT_NATINFO)
381             && ctnetlink_dump_status(skb, ct) < 0)
382                 goto nfattr_failure;
383         if (events & IPCT_REFRESH
384             && ctnetlink_dump_timeout(skb, ct) < 0)
385                 goto nfattr_failure;
386         if (events & IPCT_PROTOINFO
387             && ctnetlink_dump_protoinfo(skb, ct) < 0)
388                 goto nfattr_failure;
389         if (events & IPCT_HELPINFO
390             && ctnetlink_dump_helpinfo(skb, ct) < 0)
391                 goto nfattr_failure;
392
393         if (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         nlh->nlmsg_len = skb->tail - b;
398         nfnetlink_send(skb, 0, group, 0);
399         return NOTIFY_DONE;
400
401 nlmsg_failure:
402 nfattr_failure:
403         kfree_skb(skb);
404         return NOTIFY_DONE;
405 }
406 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
407
408 static int ctnetlink_done(struct netlink_callback *cb)
409 {
410         DEBUGP("entered %s\n", __FUNCTION__);
411         return 0;
412 }
413
414 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
415
416 static int
417 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
418 {
419         struct nf_conn *ct = NULL;
420         struct nf_conntrack_tuple_hash *h;
421         struct list_head *i;
422         u_int32_t *id = (u_int32_t *) &cb->args[1];
423         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
424         u_int8_t l3proto = nfmsg->nfgen_family;
425
426         DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__, 
427                         cb->args[0], *id);
428
429         read_lock_bh(&nf_conntrack_lock);
430         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++, *id = 0) {
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 (ct->id <= *id)
442                                 continue;
443                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
444                                                 cb->nlh->nlmsg_seq,
445                                                 IPCTNL_MSG_CT_NEW,
446                                                 1, ct) < 0)
447                                 goto out;
448                         *id = ct->id;
449                 }
450         }
451 out:    
452         read_unlock_bh(&nf_conntrack_lock);
453
454         DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
455
456         return skb->len;
457 }
458
459 #ifdef CONFIG_NF_CT_ACCT
460 static int
461 ctnetlink_dump_table_w(struct sk_buff *skb, struct netlink_callback *cb)
462 {
463         struct nf_conn *ct = NULL;
464         struct nf_conntrack_tuple_hash *h;
465         struct list_head *i;
466         u_int32_t *id = (u_int32_t *) &cb->args[1];
467         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
468         u_int8_t l3proto = nfmsg->nfgen_family; 
469
470         DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__, 
471                         cb->args[0], *id);
472
473         write_lock_bh(&nf_conntrack_lock);
474         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++, *id = 0) {
475                 list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
476                         h = (struct nf_conntrack_tuple_hash *) i;
477                         if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
478                                 continue;
479                         ct = nf_ct_tuplehash_to_ctrack(h);
480                         if (l3proto && L3PROTO(ct) != l3proto)
481                                 continue;
482                         if (ct->id <= *id)
483                                 continue;
484                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
485                                                 cb->nlh->nlmsg_seq,
486                                                 IPCTNL_MSG_CT_NEW,
487                                                 1, ct) < 0)
488                                 goto out;
489                         *id = ct->id;
490
491                         memset(&ct->counters, 0, sizeof(ct->counters));
492                 }
493         }
494 out:    
495         write_unlock_bh(&nf_conntrack_lock);
496
497         DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
498
499         return skb->len;
500 }
501 #endif
502
503 static inline int
504 ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple)
505 {
506         struct nfattr *tb[CTA_IP_MAX];
507         struct nf_conntrack_l3proto *l3proto;
508         int ret = 0;
509
510         DEBUGP("entered %s\n", __FUNCTION__);
511
512         nfattr_parse_nested(tb, CTA_IP_MAX, attr);
513
514         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
515
516         if (likely(l3proto->nfattr_to_tuple))
517                 ret = l3proto->nfattr_to_tuple(tb, tuple);
518
519         nf_ct_l3proto_put(l3proto);
520
521         DEBUGP("leaving\n");
522
523         return ret;
524 }
525
526 static const size_t cta_min_proto[CTA_PROTO_MAX] = {
527         [CTA_PROTO_NUM-1]       = sizeof(u_int8_t),
528 };
529
530 static inline int
531 ctnetlink_parse_tuple_proto(struct nfattr *attr, 
532                             struct nf_conntrack_tuple *tuple)
533 {
534         struct nfattr *tb[CTA_PROTO_MAX];
535         struct nf_conntrack_protocol *proto;
536         int ret = 0;
537
538         DEBUGP("entered %s\n", __FUNCTION__);
539
540         nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
541
542         if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
543                 return -EINVAL;
544
545         if (!tb[CTA_PROTO_NUM-1])
546                 return -EINVAL;
547         tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
548
549         proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
550
551         if (likely(proto->nfattr_to_tuple))
552                 ret = proto->nfattr_to_tuple(tb, tuple);
553
554         nf_ct_proto_put(proto);
555         
556         return ret;
557 }
558
559 static inline int
560 ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple,
561                       enum ctattr_tuple type, u_int8_t l3num)
562 {
563         struct nfattr *tb[CTA_TUPLE_MAX];
564         int err;
565
566         DEBUGP("entered %s\n", __FUNCTION__);
567
568         memset(tuple, 0, sizeof(*tuple));
569
570         nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
571
572         if (!tb[CTA_TUPLE_IP-1])
573                 return -EINVAL;
574
575         tuple->src.l3num = l3num;
576
577         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
578         if (err < 0)
579                 return err;
580
581         if (!tb[CTA_TUPLE_PROTO-1])
582                 return -EINVAL;
583
584         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
585         if (err < 0)
586                 return err;
587
588         /* orig and expect tuples get DIR_ORIGINAL */
589         if (type == CTA_TUPLE_REPLY)
590                 tuple->dst.dir = IP_CT_DIR_REPLY;
591         else
592                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
593
594         NF_CT_DUMP_TUPLE(tuple);
595
596         DEBUGP("leaving\n");
597
598         return 0;
599 }
600
601 #ifdef CONFIG_IP_NF_NAT_NEEDED
602 static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
603         [CTA_PROTONAT_PORT_MIN-1]       = sizeof(u_int16_t),
604         [CTA_PROTONAT_PORT_MAX-1]       = sizeof(u_int16_t),
605 };
606
607 static int ctnetlink_parse_nat_proto(struct nfattr *attr,
608                                      const struct nf_conn *ct,
609                                      struct ip_nat_range *range)
610 {
611         struct nfattr *tb[CTA_PROTONAT_MAX];
612         struct ip_nat_protocol *npt;
613
614         DEBUGP("entered %s\n", __FUNCTION__);
615
616         nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
617
618         if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
619                 return -EINVAL;
620
621         npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
622
623         if (!npt->nfattr_to_range) {
624                 ip_nat_proto_put(npt);
625                 return 0;
626         }
627
628         /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
629         if (npt->nfattr_to_range(tb, range) > 0)
630                 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
631
632         ip_nat_proto_put(npt);
633
634         DEBUGP("leaving\n");
635         return 0;
636 }
637
638 static const size_t cta_min_nat[CTA_NAT_MAX] = {
639         [CTA_NAT_MINIP-1]       = sizeof(u_int32_t),
640         [CTA_NAT_MAXIP-1]       = sizeof(u_int32_t),
641 };
642
643 static inline int
644 ctnetlink_parse_nat(struct nfattr *cda[],
645                     const struct nf_conn *ct, struct ip_nat_range *range)
646 {
647         struct nfattr *tb[CTA_NAT_MAX];
648         int err;
649
650         DEBUGP("entered %s\n", __FUNCTION__);
651
652         memset(range, 0, sizeof(*range));
653         
654         nfattr_parse_nested(tb, CTA_NAT_MAX, cda[CTA_NAT-1]);
655
656         if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
657                 return -EINVAL;
658
659         if (tb[CTA_NAT_MINIP-1])
660                 range->min_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
661
662         if (!tb[CTA_NAT_MAXIP-1])
663                 range->max_ip = range->min_ip;
664         else
665                 range->max_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
666
667         if (range->min_ip)
668                 range->flags |= IP_NAT_RANGE_MAP_IPS;
669
670         if (!tb[CTA_NAT_PROTO-1])
671                 return 0;
672
673         err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
674         if (err < 0)
675                 return err;
676
677         DEBUGP("leaving\n");
678         return 0;
679 }
680 #endif
681
682 static inline int
683 ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
684 {
685         struct nfattr *tb[CTA_HELP_MAX];
686
687         DEBUGP("entered %s\n", __FUNCTION__);
688
689         nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
690
691         if (!tb[CTA_HELP_NAME-1])
692                 return -EINVAL;
693
694         *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
695
696         return 0;
697 }
698
699 static const size_t cta_min[CTA_MAX] = {
700         [CTA_STATUS-1]          = sizeof(u_int32_t),
701         [CTA_TIMEOUT-1]         = sizeof(u_int32_t),
702         [CTA_MARK-1]            = sizeof(u_int32_t),
703         [CTA_USE-1]             = sizeof(u_int32_t),
704         [CTA_ID-1]              = sizeof(u_int32_t)
705 };
706
707 static int
708 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb, 
709                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
710 {
711         struct nf_conntrack_tuple_hash *h;
712         struct nf_conntrack_tuple tuple;
713         struct nf_conn *ct;
714         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
715         u_int8_t u3 = nfmsg->nfgen_family;
716         int err = 0;
717
718         DEBUGP("entered %s\n", __FUNCTION__);
719
720         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
721                 return -EINVAL;
722
723         if (cda[CTA_TUPLE_ORIG-1])
724                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
725         else if (cda[CTA_TUPLE_REPLY-1])
726                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
727         else {
728                 /* Flush the whole table */
729                 nf_conntrack_flush();
730                 return 0;
731         }
732
733         if (err < 0)
734                 return err;
735
736         h = nf_conntrack_find_get(&tuple, NULL);
737         if (!h) {
738                 DEBUGP("tuple not found in conntrack hash\n");
739                 return -ENOENT;
740         }
741
742         ct = nf_ct_tuplehash_to_ctrack(h);
743         
744         if (cda[CTA_ID-1]) {
745                 u_int32_t id = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_ID-1]));
746                 if (ct->id != id) {
747                         nf_ct_put(ct);
748                         return -ENOENT;
749                 }
750         }       
751         if (del_timer(&ct->timeout))
752                 ct->timeout.function((unsigned long)ct);
753
754         nf_ct_put(ct);
755         DEBUGP("leaving\n");
756
757         return 0;
758 }
759
760 static int
761 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb, 
762                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
763 {
764         struct nf_conntrack_tuple_hash *h;
765         struct nf_conntrack_tuple tuple;
766         struct nf_conn *ct;
767         struct sk_buff *skb2 = NULL;
768         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
769         u_int8_t u3 = nfmsg->nfgen_family;
770         int err = 0;
771
772         DEBUGP("entered %s\n", __FUNCTION__);
773
774         if (nlh->nlmsg_flags & NLM_F_DUMP) {
775                 u32 rlen;
776
777                 if (NFNL_MSG_TYPE(nlh->nlmsg_type) ==
778                                         IPCTNL_MSG_CT_GET_CTRZERO) {
779 #ifdef CONFIG_NF_CT_ACCT
780                         if ((*errp = netlink_dump_start(ctnl, skb, nlh,
781                                                 ctnetlink_dump_table_w,
782                                                 ctnetlink_done)) != 0)
783                                 return -EINVAL;
784 #else
785                         return -ENOTSUPP;
786 #endif
787                 } else {
788                         if ((*errp = netlink_dump_start(ctnl, skb, nlh,
789                                                         ctnetlink_dump_table,
790                                                         ctnetlink_done)) != 0)
791                         return -EINVAL;
792                 }
793
794                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
795                 if (rlen > skb->len)
796                         rlen = skb->len;
797                 skb_pull(skb, rlen);
798                 return 0;
799         }
800
801         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
802                 return -EINVAL;
803
804         if (cda[CTA_TUPLE_ORIG-1])
805                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
806         else if (cda[CTA_TUPLE_REPLY-1])
807                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
808         else
809                 return -EINVAL;
810
811         if (err < 0)
812                 return err;
813
814         h = nf_conntrack_find_get(&tuple, NULL);
815         if (!h) {
816                 DEBUGP("tuple not found in conntrack hash");
817                 return -ENOENT;
818         }
819         DEBUGP("tuple found\n");
820         ct = nf_ct_tuplehash_to_ctrack(h);
821
822         err = -ENOMEM;
823         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
824         if (!skb2) {
825                 nf_ct_put(ct);
826                 return -ENOMEM;
827         }
828         NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
829
830         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 
831                                   IPCTNL_MSG_CT_NEW, 1, ct);
832         nf_ct_put(ct);
833         if (err <= 0)
834                 goto free;
835
836         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
837         if (err < 0)
838                 goto out;
839
840         DEBUGP("leaving\n");
841         return 0;
842
843 free:
844         kfree_skb(skb2);
845 out:
846         return err;
847 }
848
849 static inline int
850 ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[])
851 {
852         unsigned long d;
853         unsigned status = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_STATUS-1]));
854         d = ct->status ^ status;
855
856         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
857                 /* unchangeable */
858                 return -EINVAL;
859         
860         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
861                 /* SEEN_REPLY bit can only be set */
862                 return -EINVAL;
863
864         
865         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
866                 /* ASSURED bit can only be set */
867                 return -EINVAL;
868
869         if (cda[CTA_NAT-1]) {
870 #ifndef CONFIG_IP_NF_NAT_NEEDED
871                 return -EINVAL;
872 #else
873                 unsigned int hooknum;
874                 struct ip_nat_range range;
875
876                 if (ctnetlink_parse_nat(cda, ct, &range) < 0)
877                         return -EINVAL;
878
879                 DEBUGP("NAT: %u.%u.%u.%u-%u.%u.%u.%u:%u-%u\n", 
880                        NIPQUAD(range.min_ip), NIPQUAD(range.max_ip),
881                        htons(range.min.all), htons(range.max.all));
882                 
883                 /* This is tricky but it works. ip_nat_setup_info needs the
884                  * hook number as parameter, so let's do the correct 
885                  * conversion and run away */
886                 if (status & IPS_SRC_NAT_DONE)
887                         hooknum = NF_IP_POST_ROUTING; /* IP_NAT_MANIP_SRC */
888                 else if (status & IPS_DST_NAT_DONE)
889                         hooknum = NF_IP_PRE_ROUTING;  /* IP_NAT_MANIP_DST */
890                 else 
891                         return -EINVAL; /* Missing NAT flags */
892
893                 DEBUGP("NAT status: %lu\n", 
894                        status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
895                 
896                 if (ip_nat_initialized(ct, HOOK2MANIP(hooknum)))
897                         return -EEXIST;
898                 ip_nat_setup_info(ct, &range, hooknum);
899
900                 DEBUGP("NAT status after setup_info: %lu\n",
901                        ct->status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
902 #endif
903         }
904
905         /* Be careful here, modifying NAT bits can screw up things,
906          * so don't let users modify them directly if they don't pass
907          * ip_nat_range. */
908         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
909         return 0;
910 }
911
912
913 static inline int
914 ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[])
915 {
916         struct nf_conntrack_helper *helper;
917         struct nf_conn_help *help = nfct_help(ct);
918         char *helpname;
919         int err;
920
921         DEBUGP("entered %s\n", __FUNCTION__);
922
923         if (!help) {
924                 /* FIXME: we need to reallocate and rehash */
925                 return -EBUSY;
926         }
927
928         /* don't change helper of sibling connections */
929         if (ct->master)
930                 return -EINVAL;
931
932         err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
933         if (err < 0)
934                 return err;
935
936         helper = __nf_conntrack_helper_find_byname(helpname);
937         if (!helper) {
938                 if (!strcmp(helpname, ""))
939                         helper = NULL;
940                 else
941                         return -EINVAL;
942         }
943
944         if (help->helper) {
945                 if (!helper) {
946                         /* we had a helper before ... */
947                         nf_ct_remove_expectations(ct);
948                         help->helper = NULL;
949                 } else {
950                         /* need to zero data of old helper */
951                         memset(&help->help, 0, sizeof(help->help));
952                 }
953         }
954         
955         help->helper = helper;
956
957         return 0;
958 }
959
960 static inline int
961 ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[])
962 {
963         u_int32_t timeout = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
964         
965         if (!del_timer(&ct->timeout))
966                 return -ETIME;
967
968         ct->timeout.expires = jiffies + timeout * HZ;
969         add_timer(&ct->timeout);
970
971         return 0;
972 }
973
974 static inline int
975 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[])
976 {
977         struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
978         struct nf_conntrack_protocol *proto;
979         u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
980         u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
981         int err = 0;
982
983         nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
984
985         proto = nf_ct_proto_find_get(l3num, npt);
986
987         if (proto->from_nfattr)
988                 err = proto->from_nfattr(tb, ct);
989         nf_ct_proto_put(proto); 
990
991         return err;
992 }
993
994 static int
995 ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[])
996 {
997         int err;
998
999         DEBUGP("entered %s\n", __FUNCTION__);
1000
1001         if (cda[CTA_HELP-1]) {
1002                 err = ctnetlink_change_helper(ct, cda);
1003                 if (err < 0)
1004                         return err;
1005         }
1006
1007         if (cda[CTA_TIMEOUT-1]) {
1008                 err = ctnetlink_change_timeout(ct, cda);
1009                 if (err < 0)
1010                         return err;
1011         }
1012
1013         if (cda[CTA_STATUS-1]) {
1014                 err = ctnetlink_change_status(ct, cda);
1015                 if (err < 0)
1016                         return err;
1017         }
1018
1019         if (cda[CTA_PROTOINFO-1]) {
1020                 err = ctnetlink_change_protoinfo(ct, cda);
1021                 if (err < 0)
1022                         return err;
1023         }
1024
1025 #if defined(CONFIG_NF_CONNTRACK_MARK)
1026         if (cda[CTA_MARK-1])
1027                 ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
1028 #endif
1029
1030         DEBUGP("all done\n");
1031         return 0;
1032 }
1033
1034 static int
1035 ctnetlink_create_conntrack(struct nfattr *cda[], 
1036                            struct nf_conntrack_tuple *otuple,
1037                            struct nf_conntrack_tuple *rtuple)
1038 {
1039         struct nf_conn *ct;
1040         int err = -EINVAL;
1041
1042         DEBUGP("entered %s\n", __FUNCTION__);
1043
1044         ct = nf_conntrack_alloc(otuple, rtuple);
1045         if (ct == NULL || IS_ERR(ct))
1046                 return -ENOMEM; 
1047
1048         if (!cda[CTA_TIMEOUT-1])
1049                 goto err;
1050         ct->timeout.expires = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
1051
1052         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1053         ct->status |= IPS_CONFIRMED;
1054
1055         err = ctnetlink_change_status(ct, cda);
1056         if (err < 0)
1057                 goto err;
1058
1059         if (cda[CTA_PROTOINFO-1]) {
1060                 err = ctnetlink_change_protoinfo(ct, cda);
1061                 if (err < 0)
1062                         return err;
1063         }
1064
1065 #if defined(CONFIG_NF_CONNTRACK_MARK)
1066         if (cda[CTA_MARK-1])
1067                 ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
1068 #endif
1069
1070         add_timer(&ct->timeout);
1071         nf_conntrack_hash_insert(ct);
1072
1073         DEBUGP("conntrack with id %u inserted\n", ct->id);
1074         return 0;
1075
1076 err:    
1077         nf_conntrack_free(ct);
1078         return err;
1079 }
1080
1081 static int 
1082 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb, 
1083                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1084 {
1085         struct nf_conntrack_tuple otuple, rtuple;
1086         struct nf_conntrack_tuple_hash *h = NULL;
1087         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1088         u_int8_t u3 = nfmsg->nfgen_family;
1089         int err = 0;
1090
1091         DEBUGP("entered %s\n", __FUNCTION__);
1092
1093         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
1094                 return -EINVAL;
1095
1096         if (cda[CTA_TUPLE_ORIG-1]) {
1097                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1098                 if (err < 0)
1099                         return err;
1100         }
1101
1102         if (cda[CTA_TUPLE_REPLY-1]) {
1103                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1104                 if (err < 0)
1105                         return err;
1106         }
1107
1108         write_lock_bh(&nf_conntrack_lock);
1109         if (cda[CTA_TUPLE_ORIG-1])
1110                 h = __nf_conntrack_find(&otuple, NULL);
1111         else if (cda[CTA_TUPLE_REPLY-1])
1112                 h = __nf_conntrack_find(&rtuple, NULL);
1113
1114         if (h == NULL) {
1115                 write_unlock_bh(&nf_conntrack_lock);
1116                 DEBUGP("no such conntrack, create new\n");
1117                 err = -ENOENT;
1118                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1119                         err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
1120                 return err;
1121         }
1122         /* implicit 'else' */
1123
1124         /* we only allow nat config for new conntracks */
1125         if (cda[CTA_NAT-1]) {
1126                 err = -EINVAL;
1127                 goto out_unlock;
1128         }
1129
1130         /* We manipulate the conntrack inside the global conntrack table lock,
1131          * so there's no need to increase the refcount */
1132         DEBUGP("conntrack found\n");
1133         err = -EEXIST;
1134         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1135                 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda);
1136
1137 out_unlock:
1138         write_unlock_bh(&nf_conntrack_lock);
1139         return err;
1140 }
1141
1142 /*********************************************************************** 
1143  * EXPECT 
1144  ***********************************************************************/ 
1145
1146 static inline int
1147 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1148                          const struct nf_conntrack_tuple *tuple,
1149                          enum ctattr_expect type)
1150 {
1151         struct nfattr *nest_parms = NFA_NEST(skb, type);
1152         
1153         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1154                 goto nfattr_failure;
1155
1156         NFA_NEST_END(skb, nest_parms);
1157
1158         return 0;
1159
1160 nfattr_failure:
1161         return -1;
1162 }                       
1163
1164 static inline int
1165 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1166                         const struct nf_conntrack_tuple *tuple,
1167                         const struct nf_conntrack_tuple *mask)
1168 {
1169         int ret;
1170         struct nf_conntrack_l3proto *l3proto;
1171         struct nf_conntrack_protocol *proto;
1172         struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
1173
1174         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1175         ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto);
1176         nf_ct_l3proto_put(l3proto);
1177
1178         if (unlikely(ret < 0))
1179                 goto nfattr_failure;
1180
1181         proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1182         ret = ctnetlink_dump_tuples_proto(skb, mask, proto);
1183         nf_ct_proto_put(proto);
1184         if (unlikely(ret < 0))
1185                 goto nfattr_failure;
1186
1187         NFA_NEST_END(skb, nest_parms);
1188
1189         return 0;
1190
1191 nfattr_failure:
1192         return -1;
1193 }
1194
1195 static inline int
1196 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1197                           const struct nf_conntrack_expect *exp)
1198 {
1199         struct nf_conn *master = exp->master;
1200         u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1201         u_int32_t id = htonl(exp->id);
1202
1203         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1204                 goto nfattr_failure;
1205         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1206                 goto nfattr_failure;
1207         if (ctnetlink_exp_dump_tuple(skb,
1208                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1209                                  CTA_EXPECT_MASTER) < 0)
1210                 goto nfattr_failure;
1211         
1212         NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1213         NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1214
1215         return 0;
1216         
1217 nfattr_failure:
1218         return -1;
1219 }
1220
1221 static int
1222 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1223                     int event, 
1224                     int nowait, 
1225                     const struct nf_conntrack_expect *exp)
1226 {
1227         struct nlmsghdr *nlh;
1228         struct nfgenmsg *nfmsg;
1229         unsigned char *b;
1230
1231         b = skb->tail;
1232
1233         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1234         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1235         nfmsg  = NLMSG_DATA(nlh);
1236
1237         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1238         nfmsg->nfgen_family = exp->tuple.src.l3num;
1239         nfmsg->version      = NFNETLINK_V0;
1240         nfmsg->res_id       = 0;
1241
1242         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1243                 goto nfattr_failure;
1244
1245         nlh->nlmsg_len = skb->tail - b;
1246         return skb->len;
1247
1248 nlmsg_failure:
1249 nfattr_failure:
1250         skb_trim(skb, b - skb->data);
1251         return -1;
1252 }
1253
1254 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1255 static int ctnetlink_expect_event(struct notifier_block *this,
1256                                   unsigned long events, void *ptr)
1257 {
1258         struct nlmsghdr *nlh;
1259         struct nfgenmsg *nfmsg;
1260         struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1261         struct sk_buff *skb;
1262         unsigned int type;
1263         unsigned char *b;
1264         int flags = 0;
1265
1266         if (events & IPEXP_NEW) {
1267                 type = IPCTNL_MSG_EXP_NEW;
1268                 flags = NLM_F_CREATE|NLM_F_EXCL;
1269         } else
1270                 return NOTIFY_DONE;
1271
1272         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1273         if (!skb)
1274                 return NOTIFY_DONE;
1275
1276         b = skb->tail;
1277
1278         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1279         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1280         nfmsg = NLMSG_DATA(nlh);
1281
1282         nlh->nlmsg_flags    = flags;
1283         nfmsg->nfgen_family = exp->tuple.src.l3num;
1284         nfmsg->version      = NFNETLINK_V0;
1285         nfmsg->res_id       = 0;
1286
1287         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1288                 goto nfattr_failure;
1289
1290         nlh->nlmsg_len = skb->tail - b;
1291         nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1292         return NOTIFY_DONE;
1293
1294 nlmsg_failure:
1295 nfattr_failure:
1296         kfree_skb(skb);
1297         return NOTIFY_DONE;
1298 }
1299 #endif
1300
1301 static int
1302 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1303 {
1304         struct nf_conntrack_expect *exp = NULL;
1305         struct list_head *i;
1306         u_int32_t *id = (u_int32_t *) &cb->args[0];
1307         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1308         u_int8_t l3proto = nfmsg->nfgen_family;
1309
1310         DEBUGP("entered %s, last id=%llu\n", __FUNCTION__, *id);
1311
1312         read_lock_bh(&nf_conntrack_lock);
1313         list_for_each_prev(i, &nf_conntrack_expect_list) {
1314                 exp = (struct nf_conntrack_expect *) i;
1315                 if (l3proto && exp->tuple.src.l3num != l3proto)
1316                         continue;
1317                 if (exp->id <= *id)
1318                         continue;
1319                 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1320                                             cb->nlh->nlmsg_seq,
1321                                             IPCTNL_MSG_EXP_NEW,
1322                                             1, exp) < 0)
1323                         goto out;
1324                 *id = exp->id;
1325         }
1326 out:    
1327         read_unlock_bh(&nf_conntrack_lock);
1328
1329         DEBUGP("leaving, last id=%llu\n", *id);
1330
1331         return skb->len;
1332 }
1333
1334 static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
1335         [CTA_EXPECT_TIMEOUT-1]          = sizeof(u_int32_t),
1336         [CTA_EXPECT_ID-1]               = sizeof(u_int32_t)
1337 };
1338
1339 static int
1340 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb, 
1341                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1342 {
1343         struct nf_conntrack_tuple tuple;
1344         struct nf_conntrack_expect *exp;
1345         struct sk_buff *skb2;
1346         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1347         u_int8_t u3 = nfmsg->nfgen_family;
1348         int err = 0;
1349
1350         DEBUGP("entered %s\n", __FUNCTION__);
1351
1352         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1353                 return -EINVAL;
1354
1355         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1356                 u32 rlen;
1357
1358                 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
1359                                                 ctnetlink_exp_dump_table,
1360                                                 ctnetlink_done)) != 0)
1361                         return -EINVAL;
1362                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1363                 if (rlen > skb->len)
1364                         rlen = skb->len;
1365                 skb_pull(skb, rlen);
1366                 return 0;
1367         }
1368
1369         if (cda[CTA_EXPECT_MASTER-1])
1370                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1371         else
1372                 return -EINVAL;
1373
1374         if (err < 0)
1375                 return err;
1376
1377         exp = nf_conntrack_expect_find(&tuple);
1378         if (!exp)
1379                 return -ENOENT;
1380
1381         if (cda[CTA_EXPECT_ID-1]) {
1382                 u_int32_t id = *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1383                 if (exp->id != ntohl(id)) {
1384                         nf_conntrack_expect_put(exp);
1385                         return -ENOENT;
1386                 }
1387         }       
1388
1389         err = -ENOMEM;
1390         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1391         if (!skb2)
1392                 goto out;
1393         NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
1394         
1395         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid, 
1396                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1397                                       1, exp);
1398         if (err <= 0)
1399                 goto free;
1400
1401         nf_conntrack_expect_put(exp);
1402
1403         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1404
1405 free:
1406         kfree_skb(skb2);
1407 out:
1408         nf_conntrack_expect_put(exp);
1409         return err;
1410 }
1411
1412 static int
1413 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb, 
1414                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1415 {
1416         struct nf_conntrack_expect *exp, *tmp;
1417         struct nf_conntrack_tuple tuple;
1418         struct nf_conntrack_helper *h;
1419         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1420         u_int8_t u3 = nfmsg->nfgen_family;
1421         int err;
1422
1423         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1424                 return -EINVAL;
1425
1426         if (cda[CTA_EXPECT_TUPLE-1]) {
1427                 /* delete a single expect by tuple */
1428                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1429                 if (err < 0)
1430                         return err;
1431
1432                 /* bump usage count to 2 */
1433                 exp = nf_conntrack_expect_find(&tuple);
1434                 if (!exp)
1435                         return -ENOENT;
1436
1437                 if (cda[CTA_EXPECT_ID-1]) {
1438                         u_int32_t id = 
1439                                 *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1440                         if (exp->id != ntohl(id)) {
1441                                 nf_conntrack_expect_put(exp);
1442                                 return -ENOENT;
1443                         }
1444                 }
1445
1446                 /* after list removal, usage count == 1 */
1447                 nf_conntrack_unexpect_related(exp);
1448                 /* have to put what we 'get' above. 
1449                  * after this line usage count == 0 */
1450                 nf_conntrack_expect_put(exp);
1451         } else if (cda[CTA_EXPECT_HELP_NAME-1]) {
1452                 char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
1453
1454                 /* delete all expectations for this helper */
1455                 write_lock_bh(&nf_conntrack_lock);
1456                 h = __nf_conntrack_helper_find_byname(name);
1457                 if (!h) {
1458                         write_unlock_bh(&nf_conntrack_lock);
1459                         return -EINVAL;
1460                 }
1461                 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1462                                          list) {
1463                         struct nf_conn_help *m_help = nfct_help(exp->master);
1464                         if (m_help->helper == h
1465                             && del_timer(&exp->timeout)) {
1466                                 nf_ct_unlink_expect(exp);
1467                                 nf_conntrack_expect_put(exp);
1468                         }
1469                 }
1470                 write_unlock_bh(&nf_conntrack_lock);
1471         } else {
1472                 /* This basically means we have to flush everything*/
1473                 write_lock_bh(&nf_conntrack_lock);
1474                 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1475                                          list) {
1476                         if (del_timer(&exp->timeout)) {
1477                                 nf_ct_unlink_expect(exp);
1478                                 nf_conntrack_expect_put(exp);
1479                         }
1480                 }
1481                 write_unlock_bh(&nf_conntrack_lock);
1482         }
1483
1484         return 0;
1485 }
1486 static int
1487 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[])
1488 {
1489         return -EOPNOTSUPP;
1490 }
1491
1492 static int
1493 ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3)
1494 {
1495         struct nf_conntrack_tuple tuple, mask, master_tuple;
1496         struct nf_conntrack_tuple_hash *h = NULL;
1497         struct nf_conntrack_expect *exp;
1498         struct nf_conn *ct;
1499         struct nf_conn_help *help;
1500         int err = 0;
1501
1502         DEBUGP("entered %s\n", __FUNCTION__);
1503
1504         /* caller guarantees that those three CTA_EXPECT_* exist */
1505         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1506         if (err < 0)
1507                 return err;
1508         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1509         if (err < 0)
1510                 return err;
1511         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1512         if (err < 0)
1513                 return err;
1514
1515         /* Look for master conntrack of this expectation */
1516         h = nf_conntrack_find_get(&master_tuple, NULL);
1517         if (!h)
1518                 return -ENOENT;
1519         ct = nf_ct_tuplehash_to_ctrack(h);
1520         help = nfct_help(ct);
1521
1522         if (!help || !help->helper) {
1523                 /* such conntrack hasn't got any helper, abort */
1524                 err = -EINVAL;
1525                 goto out;
1526         }
1527
1528         exp = nf_conntrack_expect_alloc(ct);
1529         if (!exp) {
1530                 err = -ENOMEM;
1531                 goto out;
1532         }
1533         
1534         exp->expectfn = NULL;
1535         exp->flags = 0;
1536         exp->master = ct;
1537         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1538         memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple));
1539
1540         err = nf_conntrack_expect_related(exp);
1541         nf_conntrack_expect_put(exp);
1542
1543 out:    
1544         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1545         return err;
1546 }
1547
1548 static int
1549 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1550                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1551 {
1552         struct nf_conntrack_tuple tuple;
1553         struct nf_conntrack_expect *exp;
1554         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1555         u_int8_t u3 = nfmsg->nfgen_family;
1556         int err = 0;
1557
1558         DEBUGP("entered %s\n", __FUNCTION__);   
1559
1560         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1561                 return -EINVAL;
1562
1563         if (!cda[CTA_EXPECT_TUPLE-1]
1564             || !cda[CTA_EXPECT_MASK-1]
1565             || !cda[CTA_EXPECT_MASTER-1])
1566                 return -EINVAL;
1567
1568         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1569         if (err < 0)
1570                 return err;
1571
1572         write_lock_bh(&nf_conntrack_lock);
1573         exp = __nf_conntrack_expect_find(&tuple);
1574
1575         if (!exp) {
1576                 write_unlock_bh(&nf_conntrack_lock);
1577                 err = -ENOENT;
1578                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1579                         err = ctnetlink_create_expect(cda, u3);
1580                 return err;
1581         }
1582
1583         err = -EEXIST;
1584         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1585                 err = ctnetlink_change_expect(exp, cda);
1586         write_unlock_bh(&nf_conntrack_lock);
1587
1588         DEBUGP("leaving\n");
1589         
1590         return err;
1591 }
1592
1593 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1594 static struct notifier_block ctnl_notifier = {
1595         .notifier_call  = ctnetlink_conntrack_event,
1596 };
1597
1598 static struct notifier_block ctnl_notifier_exp = {
1599         .notifier_call  = ctnetlink_expect_event,
1600 };
1601 #endif
1602
1603 static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1604         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1605                                             .attr_count = CTA_MAX, },
1606         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1607                                             .attr_count = CTA_MAX, },
1608         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1609                                             .attr_count = CTA_MAX, },
1610         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1611                                             .attr_count = CTA_MAX, },
1612 };
1613
1614 static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1615         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1616                                             .attr_count = CTA_EXPECT_MAX, },
1617         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1618                                             .attr_count = CTA_EXPECT_MAX, },
1619         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1620                                             .attr_count = CTA_EXPECT_MAX, },
1621 };
1622
1623 static struct nfnetlink_subsystem ctnl_subsys = {
1624         .name                           = "conntrack",
1625         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1626         .cb_count                       = IPCTNL_MSG_MAX,
1627         .cb                             = ctnl_cb,
1628 };
1629
1630 static struct nfnetlink_subsystem ctnl_exp_subsys = {
1631         .name                           = "conntrack_expect",
1632         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1633         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1634         .cb                             = ctnl_exp_cb,
1635 };
1636
1637 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1638 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1639
1640 static int __init ctnetlink_init(void)
1641 {
1642         int ret;
1643
1644         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1645         ret = nfnetlink_subsys_register(&ctnl_subsys);
1646         if (ret < 0) {
1647                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1648                 goto err_out;
1649         }
1650
1651         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1652         if (ret < 0) {
1653                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1654                 goto err_unreg_subsys;
1655         }
1656
1657 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1658         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1659         if (ret < 0) {
1660                 printk("ctnetlink_init: cannot register notifier.\n");
1661                 goto err_unreg_exp_subsys;
1662         }
1663
1664         ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp);
1665         if (ret < 0) {
1666                 printk("ctnetlink_init: cannot expect register notifier.\n");
1667                 goto err_unreg_notifier;
1668         }
1669 #endif
1670
1671         return 0;
1672
1673 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1674 err_unreg_notifier:
1675         nf_conntrack_unregister_notifier(&ctnl_notifier);
1676 err_unreg_exp_subsys:
1677         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1678 #endif
1679 err_unreg_subsys:
1680         nfnetlink_subsys_unregister(&ctnl_subsys);
1681 err_out:
1682         return ret;
1683 }
1684
1685 static void __exit ctnetlink_exit(void)
1686 {
1687         printk("ctnetlink: unregistering from nfnetlink.\n");
1688
1689 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1690         nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp);
1691         nf_conntrack_unregister_notifier(&ctnl_notifier);
1692 #endif
1693
1694         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1695         nfnetlink_subsys_unregister(&ctnl_subsys);
1696         return;
1697 }
1698
1699 module_init(ctnetlink_init);
1700 module_exit(ctnetlink_exit);