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Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[deliverable/linux.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) 2005-2007 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/types.h>
22 #include <linux/timer.h>
23 #include <linux/skbuff.h>
24 #include <linux/errno.h>
25 #include <linux/netlink.h>
26 #include <linux/spinlock.h>
27 #include <linux/interrupt.h>
28 #include <linux/notifier.h>
29
30 #include <linux/netfilter.h>
31 #include <net/netlink.h>
32 #include <net/netfilter/nf_conntrack.h>
33 #include <net/netfilter/nf_conntrack_core.h>
34 #include <net/netfilter/nf_conntrack_expect.h>
35 #include <net/netfilter/nf_conntrack_helper.h>
36 #include <net/netfilter/nf_conntrack_l3proto.h>
37 #include <net/netfilter/nf_conntrack_l4proto.h>
38 #include <net/netfilter/nf_conntrack_tuple.h>
39 #ifdef CONFIG_NF_NAT_NEEDED
40 #include <net/netfilter/nf_nat_core.h>
41 #include <net/netfilter/nf_nat_protocol.h>
42 #endif
43
44 #include <linux/netfilter/nfnetlink.h>
45 #include <linux/netfilter/nfnetlink_conntrack.h>
46
47 MODULE_LICENSE("GPL");
48
49 static char __initdata version[] = "0.93";
50
51 static inline int
52 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
53 const struct nf_conntrack_tuple *tuple,
54 struct nf_conntrack_l4proto *l4proto)
55 {
56 int ret = 0;
57 struct nlattr *nest_parms;
58
59 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
60 if (!nest_parms)
61 goto nla_put_failure;
62 NLA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
63
64 if (likely(l4proto->tuple_to_nlattr))
65 ret = l4proto->tuple_to_nlattr(skb, tuple);
66
67 nla_nest_end(skb, nest_parms);
68
69 return ret;
70
71 nla_put_failure:
72 return -1;
73 }
74
75 static inline int
76 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
77 const struct nf_conntrack_tuple *tuple,
78 struct nf_conntrack_l3proto *l3proto)
79 {
80 int ret = 0;
81 struct nlattr *nest_parms;
82
83 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
84 if (!nest_parms)
85 goto nla_put_failure;
86
87 if (likely(l3proto->tuple_to_nlattr))
88 ret = l3proto->tuple_to_nlattr(skb, tuple);
89
90 nla_nest_end(skb, nest_parms);
91
92 return ret;
93
94 nla_put_failure:
95 return -1;
96 }
97
98 static inline int
99 ctnetlink_dump_tuples(struct sk_buff *skb,
100 const struct nf_conntrack_tuple *tuple)
101 {
102 int ret;
103 struct nf_conntrack_l3proto *l3proto;
104 struct nf_conntrack_l4proto *l4proto;
105
106 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
107 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
108 nf_ct_l3proto_put(l3proto);
109
110 if (unlikely(ret < 0))
111 return ret;
112
113 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
114 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
115 nf_ct_l4proto_put(l4proto);
116
117 return ret;
118 }
119
120 static inline int
121 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
122 {
123 __be32 status = htonl((u_int32_t) ct->status);
124 NLA_PUT(skb, CTA_STATUS, sizeof(status), &status);
125 return 0;
126
127 nla_put_failure:
128 return -1;
129 }
130
131 static inline int
132 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
133 {
134 long timeout_l = ct->timeout.expires - jiffies;
135 __be32 timeout;
136
137 if (timeout_l < 0)
138 timeout = 0;
139 else
140 timeout = htonl(timeout_l / HZ);
141
142 NLA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
143 return 0;
144
145 nla_put_failure:
146 return -1;
147 }
148
149 static inline int
150 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
151 {
152 struct nf_conntrack_l4proto *l4proto = nf_ct_l4proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
153 struct nlattr *nest_proto;
154 int ret;
155
156 if (!l4proto->to_nlattr) {
157 nf_ct_l4proto_put(l4proto);
158 return 0;
159 }
160
161 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
162 if (!nest_proto)
163 goto nla_put_failure;
164
165 ret = l4proto->to_nlattr(skb, nest_proto, ct);
166
167 nf_ct_l4proto_put(l4proto);
168
169 nla_nest_end(skb, nest_proto);
170
171 return ret;
172
173 nla_put_failure:
174 nf_ct_l4proto_put(l4proto);
175 return -1;
176 }
177
178 static inline int
179 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
180 {
181 struct nlattr *nest_helper;
182 const struct nf_conn_help *help = nfct_help(ct);
183 struct nf_conntrack_helper *helper;
184
185 if (!help)
186 return 0;
187
188 rcu_read_lock();
189 helper = rcu_dereference(help->helper);
190 if (!helper)
191 goto out;
192
193 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
194 if (!nest_helper)
195 goto nla_put_failure;
196 NLA_PUT(skb, CTA_HELP_NAME, strlen(helper->name), helper->name);
197
198 if (helper->to_nlattr)
199 helper->to_nlattr(skb, ct);
200
201 nla_nest_end(skb, nest_helper);
202 out:
203 rcu_read_unlock();
204 return 0;
205
206 nla_put_failure:
207 rcu_read_unlock();
208 return -1;
209 }
210
211 #ifdef CONFIG_NF_CT_ACCT
212 static inline int
213 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
214 enum ip_conntrack_dir dir)
215 {
216 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
217 struct nlattr *nest_count;
218 __be32 tmp;
219
220 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
221 if (!nest_count)
222 goto nla_put_failure;
223
224 tmp = htonl(ct->counters[dir].packets);
225 NLA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
226
227 tmp = htonl(ct->counters[dir].bytes);
228 NLA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
229
230 nla_nest_end(skb, nest_count);
231
232 return 0;
233
234 nla_put_failure:
235 return -1;
236 }
237 #else
238 #define ctnetlink_dump_counters(a, b, c) (0)
239 #endif
240
241 #ifdef CONFIG_NF_CONNTRACK_MARK
242 static inline int
243 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
244 {
245 __be32 mark = htonl(ct->mark);
246
247 NLA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
248 return 0;
249
250 nla_put_failure:
251 return -1;
252 }
253 #else
254 #define ctnetlink_dump_mark(a, b) (0)
255 #endif
256
257 static inline int
258 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
259 {
260 __be32 id = htonl((unsigned long)ct);
261 NLA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
262 return 0;
263
264 nla_put_failure:
265 return -1;
266 }
267
268 static inline int
269 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
270 {
271 __be32 use = htonl(atomic_read(&ct->ct_general.use));
272
273 NLA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
274 return 0;
275
276 nla_put_failure:
277 return -1;
278 }
279
280 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
281
282 static int
283 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
284 int event, int nowait,
285 const struct nf_conn *ct)
286 {
287 struct nlmsghdr *nlh;
288 struct nfgenmsg *nfmsg;
289 struct nlattr *nest_parms;
290 unsigned char *b = skb_tail_pointer(skb);
291
292 event |= NFNL_SUBSYS_CTNETLINK << 8;
293 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
294 nfmsg = NLMSG_DATA(nlh);
295
296 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
297 nfmsg->nfgen_family =
298 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
299 nfmsg->version = NFNETLINK_V0;
300 nfmsg->res_id = 0;
301
302 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
303 if (!nest_parms)
304 goto nla_put_failure;
305 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
306 goto nla_put_failure;
307 nla_nest_end(skb, nest_parms);
308
309 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
310 if (!nest_parms)
311 goto nla_put_failure;
312 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
313 goto nla_put_failure;
314 nla_nest_end(skb, nest_parms);
315
316 if (ctnetlink_dump_status(skb, ct) < 0 ||
317 ctnetlink_dump_timeout(skb, ct) < 0 ||
318 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
319 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
320 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
321 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
322 ctnetlink_dump_mark(skb, ct) < 0 ||
323 ctnetlink_dump_id(skb, ct) < 0 ||
324 ctnetlink_dump_use(skb, ct) < 0)
325 goto nla_put_failure;
326
327 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
328 return skb->len;
329
330 nlmsg_failure:
331 nla_put_failure:
332 nlmsg_trim(skb, b);
333 return -1;
334 }
335
336 #ifdef CONFIG_NF_CONNTRACK_EVENTS
337 static int ctnetlink_conntrack_event(struct notifier_block *this,
338 unsigned long events, void *ptr)
339 {
340 struct nlmsghdr *nlh;
341 struct nfgenmsg *nfmsg;
342 struct nlattr *nest_parms;
343 struct nf_conn *ct = (struct nf_conn *)ptr;
344 struct sk_buff *skb;
345 unsigned int type;
346 sk_buff_data_t b;
347 unsigned int flags = 0, group;
348
349 /* ignore our fake conntrack entry */
350 if (ct == &nf_conntrack_untracked)
351 return NOTIFY_DONE;
352
353 if (events & IPCT_DESTROY) {
354 type = IPCTNL_MSG_CT_DELETE;
355 group = NFNLGRP_CONNTRACK_DESTROY;
356 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
357 type = IPCTNL_MSG_CT_NEW;
358 flags = NLM_F_CREATE|NLM_F_EXCL;
359 group = NFNLGRP_CONNTRACK_NEW;
360 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
361 type = IPCTNL_MSG_CT_NEW;
362 group = NFNLGRP_CONNTRACK_UPDATE;
363 } else
364 return NOTIFY_DONE;
365
366 if (!nfnetlink_has_listeners(group))
367 return NOTIFY_DONE;
368
369 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
370 if (!skb)
371 return NOTIFY_DONE;
372
373 b = skb->tail;
374
375 type |= NFNL_SUBSYS_CTNETLINK << 8;
376 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
377 nfmsg = NLMSG_DATA(nlh);
378
379 nlh->nlmsg_flags = flags;
380 nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
381 nfmsg->version = NFNETLINK_V0;
382 nfmsg->res_id = 0;
383
384 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
385 if (!nest_parms)
386 goto nla_put_failure;
387 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
388 goto nla_put_failure;
389 nla_nest_end(skb, nest_parms);
390
391 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
392 if (!nest_parms)
393 goto nla_put_failure;
394 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
395 goto nla_put_failure;
396 nla_nest_end(skb, nest_parms);
397
398 if (events & IPCT_DESTROY) {
399 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
400 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
401 goto nla_put_failure;
402 } else {
403 if (ctnetlink_dump_status(skb, ct) < 0)
404 goto nla_put_failure;
405
406 if (ctnetlink_dump_timeout(skb, ct) < 0)
407 goto nla_put_failure;
408
409 if (events & IPCT_PROTOINFO
410 && ctnetlink_dump_protoinfo(skb, ct) < 0)
411 goto nla_put_failure;
412
413 if ((events & IPCT_HELPER || nfct_help(ct))
414 && ctnetlink_dump_helpinfo(skb, ct) < 0)
415 goto nla_put_failure;
416
417 #ifdef CONFIG_NF_CONNTRACK_MARK
418 if ((events & IPCT_MARK || ct->mark)
419 && ctnetlink_dump_mark(skb, ct) < 0)
420 goto nla_put_failure;
421 #endif
422
423 if (events & IPCT_COUNTER_FILLING &&
424 (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
425 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
426 goto nla_put_failure;
427 }
428
429 nlh->nlmsg_len = skb->tail - b;
430 nfnetlink_send(skb, 0, group, 0);
431 return NOTIFY_DONE;
432
433 nlmsg_failure:
434 nla_put_failure:
435 kfree_skb(skb);
436 return NOTIFY_DONE;
437 }
438 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
439
440 static int ctnetlink_done(struct netlink_callback *cb)
441 {
442 if (cb->args[1])
443 nf_ct_put((struct nf_conn *)cb->args[1]);
444 return 0;
445 }
446
447 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
448
449 static int
450 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
451 {
452 struct nf_conn *ct, *last;
453 struct nf_conntrack_tuple_hash *h;
454 struct hlist_node *n;
455 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
456 u_int8_t l3proto = nfmsg->nfgen_family;
457
458 read_lock_bh(&nf_conntrack_lock);
459 last = (struct nf_conn *)cb->args[1];
460 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
461 restart:
462 hlist_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
463 hnode) {
464 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
465 continue;
466 ct = nf_ct_tuplehash_to_ctrack(h);
467 /* Dump entries of a given L3 protocol number.
468 * If it is not specified, ie. l3proto == 0,
469 * then dump everything. */
470 if (l3proto && L3PROTO(ct) != l3proto)
471 continue;
472 if (cb->args[1]) {
473 if (ct != last)
474 continue;
475 cb->args[1] = 0;
476 }
477 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
478 cb->nlh->nlmsg_seq,
479 IPCTNL_MSG_CT_NEW,
480 1, ct) < 0) {
481 nf_conntrack_get(&ct->ct_general);
482 cb->args[1] = (unsigned long)ct;
483 goto out;
484 }
485 #ifdef CONFIG_NF_CT_ACCT
486 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
487 IPCTNL_MSG_CT_GET_CTRZERO)
488 memset(&ct->counters, 0, sizeof(ct->counters));
489 #endif
490 }
491 if (cb->args[1]) {
492 cb->args[1] = 0;
493 goto restart;
494 }
495 }
496 out:
497 read_unlock_bh(&nf_conntrack_lock);
498 if (last)
499 nf_ct_put(last);
500
501 return skb->len;
502 }
503
504 static inline int
505 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
506 {
507 struct nlattr *tb[CTA_IP_MAX+1];
508 struct nf_conntrack_l3proto *l3proto;
509 int ret = 0;
510
511 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
512
513 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
514
515 if (likely(l3proto->nlattr_to_tuple)) {
516 ret = nla_validate_nested(attr, CTA_IP_MAX,
517 l3proto->nla_policy);
518 if (ret == 0)
519 ret = l3proto->nlattr_to_tuple(tb, tuple);
520 }
521
522 nf_ct_l3proto_put(l3proto);
523
524 return ret;
525 }
526
527 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
528 [CTA_PROTO_NUM] = { .type = NLA_U8 },
529 };
530
531 static inline int
532 ctnetlink_parse_tuple_proto(struct nlattr *attr,
533 struct nf_conntrack_tuple *tuple)
534 {
535 struct nlattr *tb[CTA_PROTO_MAX+1];
536 struct nf_conntrack_l4proto *l4proto;
537 int ret = 0;
538
539 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
540 if (ret < 0)
541 return ret;
542
543 if (!tb[CTA_PROTO_NUM])
544 return -EINVAL;
545 tuple->dst.protonum = *(u_int8_t *)nla_data(tb[CTA_PROTO_NUM]);
546
547 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
548
549 if (likely(l4proto->nlattr_to_tuple)) {
550 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
551 l4proto->nla_policy);
552 if (ret == 0)
553 ret = l4proto->nlattr_to_tuple(tb, tuple);
554 }
555
556 nf_ct_l4proto_put(l4proto);
557
558 return ret;
559 }
560
561 static inline int
562 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
563 enum ctattr_tuple type, u_int8_t l3num)
564 {
565 struct nlattr *tb[CTA_TUPLE_MAX+1];
566 int err;
567
568 memset(tuple, 0, sizeof(*tuple));
569
570 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
571
572 if (!tb[CTA_TUPLE_IP])
573 return -EINVAL;
574
575 tuple->src.l3num = l3num;
576
577 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
578 if (err < 0)
579 return err;
580
581 if (!tb[CTA_TUPLE_PROTO])
582 return -EINVAL;
583
584 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], 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 return 0;
595 }
596
597 #ifdef CONFIG_NF_NAT_NEEDED
598 static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
599 [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 },
600 [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 },
601 };
602
603 static int nfnetlink_parse_nat_proto(struct nlattr *attr,
604 const struct nf_conn *ct,
605 struct nf_nat_range *range)
606 {
607 struct nlattr *tb[CTA_PROTONAT_MAX+1];
608 struct nf_nat_protocol *npt;
609 int err;
610
611 err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
612 if (err < 0)
613 return err;
614
615 npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
616
617 if (!npt->nlattr_to_range) {
618 nf_nat_proto_put(npt);
619 return 0;
620 }
621
622 /* nlattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
623 if (npt->nlattr_to_range(tb, range) > 0)
624 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
625
626 nf_nat_proto_put(npt);
627
628 return 0;
629 }
630
631 static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
632 [CTA_NAT_MINIP] = { .type = NLA_U32 },
633 [CTA_NAT_MAXIP] = { .type = NLA_U32 },
634 };
635
636 static inline int
637 nfnetlink_parse_nat(struct nlattr *nat,
638 const struct nf_conn *ct, struct nf_nat_range *range)
639 {
640 struct nlattr *tb[CTA_NAT_MAX+1];
641 int err;
642
643 memset(range, 0, sizeof(*range));
644
645 err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
646 if (err < 0)
647 return err;
648
649 if (tb[CTA_NAT_MINIP])
650 range->min_ip = *(__be32 *)nla_data(tb[CTA_NAT_MINIP]);
651
652 if (!tb[CTA_NAT_MAXIP])
653 range->max_ip = range->min_ip;
654 else
655 range->max_ip = *(__be32 *)nla_data(tb[CTA_NAT_MAXIP]);
656
657 if (range->min_ip)
658 range->flags |= IP_NAT_RANGE_MAP_IPS;
659
660 if (!tb[CTA_NAT_PROTO])
661 return 0;
662
663 err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
664 if (err < 0)
665 return err;
666
667 return 0;
668 }
669 #endif
670
671 static inline int
672 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
673 {
674 struct nlattr *tb[CTA_HELP_MAX+1];
675
676 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
677
678 if (!tb[CTA_HELP_NAME])
679 return -EINVAL;
680
681 *helper_name = nla_data(tb[CTA_HELP_NAME]);
682
683 return 0;
684 }
685
686 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
687 [CTA_STATUS] = { .type = NLA_U32 },
688 [CTA_TIMEOUT] = { .type = NLA_U32 },
689 [CTA_MARK] = { .type = NLA_U32 },
690 [CTA_USE] = { .type = NLA_U32 },
691 [CTA_ID] = { .type = NLA_U32 },
692 };
693
694 static int
695 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
696 struct nlmsghdr *nlh, struct nlattr *cda[])
697 {
698 struct nf_conntrack_tuple_hash *h;
699 struct nf_conntrack_tuple tuple;
700 struct nf_conn *ct;
701 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
702 u_int8_t u3 = nfmsg->nfgen_family;
703 int err = 0;
704
705 if (cda[CTA_TUPLE_ORIG])
706 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
707 else if (cda[CTA_TUPLE_REPLY])
708 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
709 else {
710 /* Flush the whole table */
711 nf_conntrack_flush();
712 return 0;
713 }
714
715 if (err < 0)
716 return err;
717
718 h = nf_conntrack_find_get(&tuple);
719 if (!h)
720 return -ENOENT;
721
722 ct = nf_ct_tuplehash_to_ctrack(h);
723
724 if (cda[CTA_ID]) {
725 u_int32_t id = ntohl(*(__be32 *)nla_data(cda[CTA_ID]));
726 if (id != (u32)(unsigned long)ct) {
727 nf_ct_put(ct);
728 return -ENOENT;
729 }
730 }
731 if (del_timer(&ct->timeout))
732 ct->timeout.function((unsigned long)ct);
733
734 nf_ct_put(ct);
735
736 return 0;
737 }
738
739 static int
740 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
741 struct nlmsghdr *nlh, struct nlattr *cda[])
742 {
743 struct nf_conntrack_tuple_hash *h;
744 struct nf_conntrack_tuple tuple;
745 struct nf_conn *ct;
746 struct sk_buff *skb2 = NULL;
747 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
748 u_int8_t u3 = nfmsg->nfgen_family;
749 int err = 0;
750
751 if (nlh->nlmsg_flags & NLM_F_DUMP) {
752 #ifndef CONFIG_NF_CT_ACCT
753 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
754 return -ENOTSUPP;
755 #endif
756 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
757 ctnetlink_done);
758 }
759
760 if (cda[CTA_TUPLE_ORIG])
761 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
762 else if (cda[CTA_TUPLE_REPLY])
763 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
764 else
765 return -EINVAL;
766
767 if (err < 0)
768 return err;
769
770 h = nf_conntrack_find_get(&tuple);
771 if (!h)
772 return -ENOENT;
773
774 ct = nf_ct_tuplehash_to_ctrack(h);
775
776 err = -ENOMEM;
777 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
778 if (!skb2) {
779 nf_ct_put(ct);
780 return -ENOMEM;
781 }
782
783 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
784 IPCTNL_MSG_CT_NEW, 1, ct);
785 nf_ct_put(ct);
786 if (err <= 0)
787 goto free;
788
789 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
790 if (err < 0)
791 goto out;
792
793 return 0;
794
795 free:
796 kfree_skb(skb2);
797 out:
798 return err;
799 }
800
801 static inline int
802 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
803 {
804 unsigned long d;
805 unsigned int status = ntohl(*(__be32 *)nla_data(cda[CTA_STATUS]));
806 d = ct->status ^ status;
807
808 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
809 /* unchangeable */
810 return -EINVAL;
811
812 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
813 /* SEEN_REPLY bit can only be set */
814 return -EINVAL;
815
816
817 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
818 /* ASSURED bit can only be set */
819 return -EINVAL;
820
821 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
822 #ifndef CONFIG_NF_NAT_NEEDED
823 return -EINVAL;
824 #else
825 struct nf_nat_range range;
826
827 if (cda[CTA_NAT_DST]) {
828 if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
829 &range) < 0)
830 return -EINVAL;
831 if (nf_nat_initialized(ct,
832 HOOK2MANIP(NF_IP_PRE_ROUTING)))
833 return -EEXIST;
834 nf_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
835 }
836 if (cda[CTA_NAT_SRC]) {
837 if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
838 &range) < 0)
839 return -EINVAL;
840 if (nf_nat_initialized(ct,
841 HOOK2MANIP(NF_IP_POST_ROUTING)))
842 return -EEXIST;
843 nf_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
844 }
845 #endif
846 }
847
848 /* Be careful here, modifying NAT bits can screw up things,
849 * so don't let users modify them directly if they don't pass
850 * nf_nat_range. */
851 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
852 return 0;
853 }
854
855
856 static inline int
857 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
858 {
859 struct nf_conntrack_helper *helper;
860 struct nf_conn_help *help = nfct_help(ct);
861 char *helpname;
862 int err;
863
864 /* don't change helper of sibling connections */
865 if (ct->master)
866 return -EINVAL;
867
868 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
869 if (err < 0)
870 return err;
871
872 if (!strcmp(helpname, "")) {
873 if (help && help->helper) {
874 /* we had a helper before ... */
875 nf_ct_remove_expectations(ct);
876 rcu_assign_pointer(help->helper, NULL);
877 }
878
879 return 0;
880 }
881
882 helper = __nf_conntrack_helper_find_byname(helpname);
883 if (helper == NULL)
884 return -EINVAL;
885
886 if (help) {
887 if (help->helper == helper)
888 return 0;
889 if (help->helper)
890 return -EBUSY;
891 /* need to zero data of old helper */
892 memset(&help->help, 0, sizeof(help->help));
893 } else {
894 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
895 if (help == NULL)
896 return -ENOMEM;
897 }
898
899 rcu_assign_pointer(help->helper, helper);
900
901 return 0;
902 }
903
904 static inline int
905 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
906 {
907 u_int32_t timeout = ntohl(*(__be32 *)nla_data(cda[CTA_TIMEOUT]));
908
909 if (!del_timer(&ct->timeout))
910 return -ETIME;
911
912 ct->timeout.expires = jiffies + timeout * HZ;
913 add_timer(&ct->timeout);
914
915 return 0;
916 }
917
918 static inline int
919 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
920 {
921 struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
922 struct nf_conntrack_l4proto *l4proto;
923 u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
924 u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
925 int err = 0;
926
927 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
928
929 l4proto = nf_ct_l4proto_find_get(l3num, npt);
930
931 if (l4proto->from_nlattr)
932 err = l4proto->from_nlattr(tb, ct);
933 nf_ct_l4proto_put(l4proto);
934
935 return err;
936 }
937
938 static int
939 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
940 {
941 int err;
942
943 if (cda[CTA_HELP]) {
944 err = ctnetlink_change_helper(ct, cda);
945 if (err < 0)
946 return err;
947 }
948
949 if (cda[CTA_TIMEOUT]) {
950 err = ctnetlink_change_timeout(ct, cda);
951 if (err < 0)
952 return err;
953 }
954
955 if (cda[CTA_STATUS]) {
956 err = ctnetlink_change_status(ct, cda);
957 if (err < 0)
958 return err;
959 }
960
961 if (cda[CTA_PROTOINFO]) {
962 err = ctnetlink_change_protoinfo(ct, cda);
963 if (err < 0)
964 return err;
965 }
966
967 #if defined(CONFIG_NF_CONNTRACK_MARK)
968 if (cda[CTA_MARK])
969 ct->mark = ntohl(*(__be32 *)nla_data(cda[CTA_MARK]));
970 #endif
971
972 return 0;
973 }
974
975 static int
976 ctnetlink_create_conntrack(struct nlattr *cda[],
977 struct nf_conntrack_tuple *otuple,
978 struct nf_conntrack_tuple *rtuple,
979 struct nf_conn *master_ct)
980 {
981 struct nf_conn *ct;
982 int err = -EINVAL;
983 struct nf_conn_help *help;
984 struct nf_conntrack_helper *helper;
985
986 ct = nf_conntrack_alloc(otuple, rtuple);
987 if (ct == NULL || IS_ERR(ct))
988 return -ENOMEM;
989
990 if (!cda[CTA_TIMEOUT])
991 goto err;
992 ct->timeout.expires = ntohl(*(__be32 *)nla_data(cda[CTA_TIMEOUT]));
993
994 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
995 ct->status |= IPS_CONFIRMED;
996
997 if (cda[CTA_STATUS]) {
998 err = ctnetlink_change_status(ct, cda);
999 if (err < 0)
1000 goto err;
1001 }
1002
1003 if (cda[CTA_PROTOINFO]) {
1004 err = ctnetlink_change_protoinfo(ct, cda);
1005 if (err < 0)
1006 goto err;
1007 }
1008
1009 #if defined(CONFIG_NF_CONNTRACK_MARK)
1010 if (cda[CTA_MARK])
1011 ct->mark = ntohl(*(__be32 *)nla_data(cda[CTA_MARK]));
1012 #endif
1013
1014 helper = nf_ct_helper_find_get(rtuple);
1015 if (helper) {
1016 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
1017 if (help == NULL) {
1018 nf_ct_helper_put(helper);
1019 err = -ENOMEM;
1020 goto err;
1021 }
1022 /* not in hash table yet so not strictly necessary */
1023 rcu_assign_pointer(help->helper, helper);
1024 }
1025
1026 /* setup master conntrack: this is a confirmed expectation */
1027 if (master_ct) {
1028 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1029 ct->master = master_ct;
1030 }
1031
1032 add_timer(&ct->timeout);
1033 nf_conntrack_hash_insert(ct);
1034
1035 if (helper)
1036 nf_ct_helper_put(helper);
1037
1038 return 0;
1039
1040 err:
1041 nf_conntrack_free(ct);
1042 return err;
1043 }
1044
1045 static int
1046 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1047 struct nlmsghdr *nlh, struct nlattr *cda[])
1048 {
1049 struct nf_conntrack_tuple otuple, rtuple;
1050 struct nf_conntrack_tuple_hash *h = NULL;
1051 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1052 u_int8_t u3 = nfmsg->nfgen_family;
1053 int err = 0;
1054
1055 if (cda[CTA_TUPLE_ORIG]) {
1056 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1057 if (err < 0)
1058 return err;
1059 }
1060
1061 if (cda[CTA_TUPLE_REPLY]) {
1062 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1063 if (err < 0)
1064 return err;
1065 }
1066
1067 write_lock_bh(&nf_conntrack_lock);
1068 if (cda[CTA_TUPLE_ORIG])
1069 h = __nf_conntrack_find(&otuple, NULL);
1070 else if (cda[CTA_TUPLE_REPLY])
1071 h = __nf_conntrack_find(&rtuple, NULL);
1072
1073 if (h == NULL) {
1074 struct nf_conntrack_tuple master;
1075 struct nf_conntrack_tuple_hash *master_h = NULL;
1076 struct nf_conn *master_ct = NULL;
1077
1078 if (cda[CTA_TUPLE_MASTER]) {
1079 err = ctnetlink_parse_tuple(cda,
1080 &master,
1081 CTA_TUPLE_MASTER,
1082 u3);
1083 if (err < 0)
1084 return err;
1085
1086 master_h = __nf_conntrack_find(&master, NULL);
1087 if (master_h == NULL) {
1088 err = -ENOENT;
1089 goto out_unlock;
1090 }
1091 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1092 atomic_inc(&master_ct->ct_general.use);
1093 }
1094
1095 write_unlock_bh(&nf_conntrack_lock);
1096 err = -ENOENT;
1097 if (nlh->nlmsg_flags & NLM_F_CREATE)
1098 err = ctnetlink_create_conntrack(cda,
1099 &otuple,
1100 &rtuple,
1101 master_ct);
1102 if (err < 0 && master_ct)
1103 nf_ct_put(master_ct);
1104
1105 return err;
1106 }
1107 /* implicit 'else' */
1108
1109 /* We manipulate the conntrack inside the global conntrack table lock,
1110 * so there's no need to increase the refcount */
1111 err = -EEXIST;
1112 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1113 /* we only allow nat config for new conntracks */
1114 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1115 err = -EINVAL;
1116 goto out_unlock;
1117 }
1118 /* can't link an existing conntrack to a master */
1119 if (cda[CTA_TUPLE_MASTER]) {
1120 err = -EINVAL;
1121 goto out_unlock;
1122 }
1123 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1124 cda);
1125 }
1126
1127 out_unlock:
1128 write_unlock_bh(&nf_conntrack_lock);
1129 return err;
1130 }
1131
1132 /***********************************************************************
1133 * EXPECT
1134 ***********************************************************************/
1135
1136 static inline int
1137 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1138 const struct nf_conntrack_tuple *tuple,
1139 enum ctattr_expect type)
1140 {
1141 struct nlattr *nest_parms;
1142
1143 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1144 if (!nest_parms)
1145 goto nla_put_failure;
1146 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1147 goto nla_put_failure;
1148 nla_nest_end(skb, nest_parms);
1149
1150 return 0;
1151
1152 nla_put_failure:
1153 return -1;
1154 }
1155
1156 static inline int
1157 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1158 const struct nf_conntrack_tuple *tuple,
1159 const struct nf_conntrack_tuple_mask *mask)
1160 {
1161 int ret;
1162 struct nf_conntrack_l3proto *l3proto;
1163 struct nf_conntrack_l4proto *l4proto;
1164 struct nf_conntrack_tuple m;
1165 struct nlattr *nest_parms;
1166
1167 memset(&m, 0xFF, sizeof(m));
1168 m.src.u.all = mask->src.u.all;
1169 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1170
1171 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1172 if (!nest_parms)
1173 goto nla_put_failure;
1174
1175 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1176 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1177 nf_ct_l3proto_put(l3proto);
1178
1179 if (unlikely(ret < 0))
1180 goto nla_put_failure;
1181
1182 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1183 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1184 nf_ct_l4proto_put(l4proto);
1185 if (unlikely(ret < 0))
1186 goto nla_put_failure;
1187
1188 nla_nest_end(skb, nest_parms);
1189
1190 return 0;
1191
1192 nla_put_failure:
1193 return -1;
1194 }
1195
1196 static inline int
1197 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1198 const struct nf_conntrack_expect *exp)
1199 {
1200 struct nf_conn *master = exp->master;
1201 __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1202 __be32 id = htonl((unsigned long)exp);
1203
1204 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1205 goto nla_put_failure;
1206 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1207 goto nla_put_failure;
1208 if (ctnetlink_exp_dump_tuple(skb,
1209 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1210 CTA_EXPECT_MASTER) < 0)
1211 goto nla_put_failure;
1212
1213 NLA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1214 NLA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1215
1216 return 0;
1217
1218 nla_put_failure:
1219 return -1;
1220 }
1221
1222 static int
1223 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1224 int event,
1225 int nowait,
1226 const struct nf_conntrack_expect *exp)
1227 {
1228 struct nlmsghdr *nlh;
1229 struct nfgenmsg *nfmsg;
1230 unsigned char *b = skb_tail_pointer(skb);
1231
1232 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1233 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1234 nfmsg = NLMSG_DATA(nlh);
1235
1236 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1237 nfmsg->nfgen_family = exp->tuple.src.l3num;
1238 nfmsg->version = NFNETLINK_V0;
1239 nfmsg->res_id = 0;
1240
1241 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1242 goto nla_put_failure;
1243
1244 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1245 return skb->len;
1246
1247 nlmsg_failure:
1248 nla_put_failure:
1249 nlmsg_trim(skb, b);
1250 return -1;
1251 }
1252
1253 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1254 static int ctnetlink_expect_event(struct notifier_block *this,
1255 unsigned long events, void *ptr)
1256 {
1257 struct nlmsghdr *nlh;
1258 struct nfgenmsg *nfmsg;
1259 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1260 struct sk_buff *skb;
1261 unsigned int type;
1262 sk_buff_data_t b;
1263 int flags = 0;
1264
1265 if (events & IPEXP_NEW) {
1266 type = IPCTNL_MSG_EXP_NEW;
1267 flags = NLM_F_CREATE|NLM_F_EXCL;
1268 } else
1269 return NOTIFY_DONE;
1270
1271 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1272 return NOTIFY_DONE;
1273
1274 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1275 if (!skb)
1276 return NOTIFY_DONE;
1277
1278 b = skb->tail;
1279
1280 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1281 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1282 nfmsg = NLMSG_DATA(nlh);
1283
1284 nlh->nlmsg_flags = flags;
1285 nfmsg->nfgen_family = exp->tuple.src.l3num;
1286 nfmsg->version = NFNETLINK_V0;
1287 nfmsg->res_id = 0;
1288
1289 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1290 goto nla_put_failure;
1291
1292 nlh->nlmsg_len = skb->tail - b;
1293 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1294 return NOTIFY_DONE;
1295
1296 nlmsg_failure:
1297 nla_put_failure:
1298 kfree_skb(skb);
1299 return NOTIFY_DONE;
1300 }
1301 #endif
1302 static int ctnetlink_exp_done(struct netlink_callback *cb)
1303 {
1304 if (cb->args[1])
1305 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1306 return 0;
1307 }
1308
1309 static int
1310 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1311 {
1312 struct nf_conntrack_expect *exp, *last;
1313 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1314 struct hlist_node *n;
1315 u_int8_t l3proto = nfmsg->nfgen_family;
1316
1317 read_lock_bh(&nf_conntrack_lock);
1318 last = (struct nf_conntrack_expect *)cb->args[1];
1319 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1320 restart:
1321 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1322 hnode) {
1323 if (l3proto && exp->tuple.src.l3num != l3proto)
1324 continue;
1325 if (cb->args[1]) {
1326 if (exp != last)
1327 continue;
1328 cb->args[1] = 0;
1329 }
1330 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1331 cb->nlh->nlmsg_seq,
1332 IPCTNL_MSG_EXP_NEW,
1333 1, exp) < 0) {
1334 atomic_inc(&exp->use);
1335 cb->args[1] = (unsigned long)exp;
1336 goto out;
1337 }
1338 }
1339 if (cb->args[1]) {
1340 cb->args[1] = 0;
1341 goto restart;
1342 }
1343 }
1344 out:
1345 read_unlock_bh(&nf_conntrack_lock);
1346 if (last)
1347 nf_ct_expect_put(last);
1348
1349 return skb->len;
1350 }
1351
1352 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1353 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1354 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1355 };
1356
1357 static int
1358 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1359 struct nlmsghdr *nlh, struct nlattr *cda[])
1360 {
1361 struct nf_conntrack_tuple tuple;
1362 struct nf_conntrack_expect *exp;
1363 struct sk_buff *skb2;
1364 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1365 u_int8_t u3 = nfmsg->nfgen_family;
1366 int err = 0;
1367
1368 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1369 return netlink_dump_start(ctnl, skb, nlh,
1370 ctnetlink_exp_dump_table,
1371 ctnetlink_exp_done);
1372 }
1373
1374 if (cda[CTA_EXPECT_MASTER])
1375 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1376 else
1377 return -EINVAL;
1378
1379 if (err < 0)
1380 return err;
1381
1382 exp = nf_ct_expect_find_get(&tuple);
1383 if (!exp)
1384 return -ENOENT;
1385
1386 if (cda[CTA_EXPECT_ID]) {
1387 __be32 id = *(__be32 *)nla_data(cda[CTA_EXPECT_ID]);
1388 if (ntohl(id) != (u32)(unsigned long)exp) {
1389 nf_ct_expect_put(exp);
1390 return -ENOENT;
1391 }
1392 }
1393
1394 err = -ENOMEM;
1395 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1396 if (!skb2)
1397 goto out;
1398
1399 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1400 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1401 1, exp);
1402 if (err <= 0)
1403 goto free;
1404
1405 nf_ct_expect_put(exp);
1406
1407 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1408
1409 free:
1410 kfree_skb(skb2);
1411 out:
1412 nf_ct_expect_put(exp);
1413 return err;
1414 }
1415
1416 static int
1417 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1418 struct nlmsghdr *nlh, struct nlattr *cda[])
1419 {
1420 struct nf_conntrack_expect *exp;
1421 struct nf_conntrack_tuple tuple;
1422 struct nf_conntrack_helper *h;
1423 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1424 struct hlist_node *n, *next;
1425 u_int8_t u3 = nfmsg->nfgen_family;
1426 unsigned int i;
1427 int err;
1428
1429 if (cda[CTA_EXPECT_TUPLE]) {
1430 /* delete a single expect by tuple */
1431 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1432 if (err < 0)
1433 return err;
1434
1435 /* bump usage count to 2 */
1436 exp = nf_ct_expect_find_get(&tuple);
1437 if (!exp)
1438 return -ENOENT;
1439
1440 if (cda[CTA_EXPECT_ID]) {
1441 __be32 id = *(__be32 *)nla_data(cda[CTA_EXPECT_ID]);
1442 if (ntohl(id) != (u32)(unsigned long)exp) {
1443 nf_ct_expect_put(exp);
1444 return -ENOENT;
1445 }
1446 }
1447
1448 /* after list removal, usage count == 1 */
1449 nf_ct_unexpect_related(exp);
1450 /* have to put what we 'get' above.
1451 * after this line usage count == 0 */
1452 nf_ct_expect_put(exp);
1453 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1454 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1455 struct nf_conn_help *m_help;
1456
1457 /* delete all expectations for this helper */
1458 write_lock_bh(&nf_conntrack_lock);
1459 h = __nf_conntrack_helper_find_byname(name);
1460 if (!h) {
1461 write_unlock_bh(&nf_conntrack_lock);
1462 return -EINVAL;
1463 }
1464 for (i = 0; i < nf_ct_expect_hsize; i++) {
1465 hlist_for_each_entry_safe(exp, n, next,
1466 &nf_ct_expect_hash[i],
1467 hnode) {
1468 m_help = nfct_help(exp->master);
1469 if (m_help->helper == h
1470 && del_timer(&exp->timeout)) {
1471 nf_ct_unlink_expect(exp);
1472 nf_ct_expect_put(exp);
1473 }
1474 }
1475 }
1476 write_unlock_bh(&nf_conntrack_lock);
1477 } else {
1478 /* This basically means we have to flush everything*/
1479 write_lock_bh(&nf_conntrack_lock);
1480 for (i = 0; i < nf_ct_expect_hsize; i++) {
1481 hlist_for_each_entry_safe(exp, n, next,
1482 &nf_ct_expect_hash[i],
1483 hnode) {
1484 if (del_timer(&exp->timeout)) {
1485 nf_ct_unlink_expect(exp);
1486 nf_ct_expect_put(exp);
1487 }
1488 }
1489 }
1490 write_unlock_bh(&nf_conntrack_lock);
1491 }
1492
1493 return 0;
1494 }
1495 static int
1496 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1497 {
1498 return -EOPNOTSUPP;
1499 }
1500
1501 static int
1502 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1503 {
1504 struct nf_conntrack_tuple tuple, mask, master_tuple;
1505 struct nf_conntrack_tuple_hash *h = NULL;
1506 struct nf_conntrack_expect *exp;
1507 struct nf_conn *ct;
1508 struct nf_conn_help *help;
1509 int err = 0;
1510
1511 /* caller guarantees that those three CTA_EXPECT_* exist */
1512 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1513 if (err < 0)
1514 return err;
1515 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1516 if (err < 0)
1517 return err;
1518 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1519 if (err < 0)
1520 return err;
1521
1522 /* Look for master conntrack of this expectation */
1523 h = nf_conntrack_find_get(&master_tuple);
1524 if (!h)
1525 return -ENOENT;
1526 ct = nf_ct_tuplehash_to_ctrack(h);
1527 help = nfct_help(ct);
1528
1529 if (!help || !help->helper) {
1530 /* such conntrack hasn't got any helper, abort */
1531 err = -EINVAL;
1532 goto out;
1533 }
1534
1535 exp = nf_ct_expect_alloc(ct);
1536 if (!exp) {
1537 err = -ENOMEM;
1538 goto out;
1539 }
1540
1541 exp->expectfn = NULL;
1542 exp->flags = 0;
1543 exp->master = ct;
1544 exp->helper = NULL;
1545 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1546 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1547 exp->mask.src.u.all = mask.src.u.all;
1548
1549 err = nf_ct_expect_related(exp);
1550 nf_ct_expect_put(exp);
1551
1552 out:
1553 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1554 return err;
1555 }
1556
1557 static int
1558 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1559 struct nlmsghdr *nlh, struct nlattr *cda[])
1560 {
1561 struct nf_conntrack_tuple tuple;
1562 struct nf_conntrack_expect *exp;
1563 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1564 u_int8_t u3 = nfmsg->nfgen_family;
1565 int err = 0;
1566
1567 if (!cda[CTA_EXPECT_TUPLE]
1568 || !cda[CTA_EXPECT_MASK]
1569 || !cda[CTA_EXPECT_MASTER])
1570 return -EINVAL;
1571
1572 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1573 if (err < 0)
1574 return err;
1575
1576 write_lock_bh(&nf_conntrack_lock);
1577 exp = __nf_ct_expect_find(&tuple);
1578
1579 if (!exp) {
1580 write_unlock_bh(&nf_conntrack_lock);
1581 err = -ENOENT;
1582 if (nlh->nlmsg_flags & NLM_F_CREATE)
1583 err = ctnetlink_create_expect(cda, u3);
1584 return err;
1585 }
1586
1587 err = -EEXIST;
1588 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1589 err = ctnetlink_change_expect(exp, cda);
1590 write_unlock_bh(&nf_conntrack_lock);
1591
1592 return err;
1593 }
1594
1595 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1596 static struct notifier_block ctnl_notifier = {
1597 .notifier_call = ctnetlink_conntrack_event,
1598 };
1599
1600 static struct notifier_block ctnl_notifier_exp = {
1601 .notifier_call = ctnetlink_expect_event,
1602 };
1603 #endif
1604
1605 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1606 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1607 .attr_count = CTA_MAX,
1608 .policy = ct_nla_policy },
1609 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1610 .attr_count = CTA_MAX,
1611 .policy = ct_nla_policy },
1612 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1613 .attr_count = CTA_MAX,
1614 .policy = ct_nla_policy },
1615 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1616 .attr_count = CTA_MAX,
1617 .policy = ct_nla_policy },
1618 };
1619
1620 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1621 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1622 .attr_count = CTA_EXPECT_MAX,
1623 .policy = exp_nla_policy },
1624 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1625 .attr_count = CTA_EXPECT_MAX,
1626 .policy = exp_nla_policy },
1627 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1628 .attr_count = CTA_EXPECT_MAX,
1629 .policy = exp_nla_policy },
1630 };
1631
1632 static const struct nfnetlink_subsystem ctnl_subsys = {
1633 .name = "conntrack",
1634 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1635 .cb_count = IPCTNL_MSG_MAX,
1636 .cb = ctnl_cb,
1637 };
1638
1639 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1640 .name = "conntrack_expect",
1641 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1642 .cb_count = IPCTNL_MSG_EXP_MAX,
1643 .cb = ctnl_exp_cb,
1644 };
1645
1646 MODULE_ALIAS("ip_conntrack_netlink");
1647 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1648 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1649
1650 static int __init ctnetlink_init(void)
1651 {
1652 int ret;
1653
1654 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1655 ret = nfnetlink_subsys_register(&ctnl_subsys);
1656 if (ret < 0) {
1657 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1658 goto err_out;
1659 }
1660
1661 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1662 if (ret < 0) {
1663 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1664 goto err_unreg_subsys;
1665 }
1666
1667 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1668 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1669 if (ret < 0) {
1670 printk("ctnetlink_init: cannot register notifier.\n");
1671 goto err_unreg_exp_subsys;
1672 }
1673
1674 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1675 if (ret < 0) {
1676 printk("ctnetlink_init: cannot expect register notifier.\n");
1677 goto err_unreg_notifier;
1678 }
1679 #endif
1680
1681 return 0;
1682
1683 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1684 err_unreg_notifier:
1685 nf_conntrack_unregister_notifier(&ctnl_notifier);
1686 err_unreg_exp_subsys:
1687 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1688 #endif
1689 err_unreg_subsys:
1690 nfnetlink_subsys_unregister(&ctnl_subsys);
1691 err_out:
1692 return ret;
1693 }
1694
1695 static void __exit ctnetlink_exit(void)
1696 {
1697 printk("ctnetlink: unregistering from nfnetlink.\n");
1698
1699 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1700 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1701 nf_conntrack_unregister_notifier(&ctnl_notifier);
1702 #endif
1703
1704 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1705 nfnetlink_subsys_unregister(&ctnl_subsys);
1706 return;
1707 }
1708
1709 module_init(ctnetlink_init);
1710 module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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