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Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw
[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 ct->master = master_ct;
1029
1030 add_timer(&ct->timeout);
1031 nf_conntrack_hash_insert(ct);
1032
1033 if (helper)
1034 nf_ct_helper_put(helper);
1035
1036 return 0;
1037
1038 err:
1039 nf_conntrack_free(ct);
1040 return err;
1041 }
1042
1043 static int
1044 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1045 struct nlmsghdr *nlh, struct nlattr *cda[])
1046 {
1047 struct nf_conntrack_tuple otuple, rtuple;
1048 struct nf_conntrack_tuple_hash *h = NULL;
1049 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1050 u_int8_t u3 = nfmsg->nfgen_family;
1051 int err = 0;
1052
1053 if (cda[CTA_TUPLE_ORIG]) {
1054 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1055 if (err < 0)
1056 return err;
1057 }
1058
1059 if (cda[CTA_TUPLE_REPLY]) {
1060 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1061 if (err < 0)
1062 return err;
1063 }
1064
1065 write_lock_bh(&nf_conntrack_lock);
1066 if (cda[CTA_TUPLE_ORIG])
1067 h = __nf_conntrack_find(&otuple, NULL);
1068 else if (cda[CTA_TUPLE_REPLY])
1069 h = __nf_conntrack_find(&rtuple, NULL);
1070
1071 if (h == NULL) {
1072 struct nf_conntrack_tuple master;
1073 struct nf_conntrack_tuple_hash *master_h = NULL;
1074 struct nf_conn *master_ct = NULL;
1075
1076 if (cda[CTA_TUPLE_MASTER]) {
1077 err = ctnetlink_parse_tuple(cda,
1078 &master,
1079 CTA_TUPLE_MASTER,
1080 u3);
1081 if (err < 0)
1082 return err;
1083
1084 master_h = __nf_conntrack_find(&master, NULL);
1085 if (master_h == NULL) {
1086 err = -ENOENT;
1087 goto out_unlock;
1088 }
1089 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1090 atomic_inc(&master_ct->ct_general.use);
1091 }
1092
1093 write_unlock_bh(&nf_conntrack_lock);
1094 err = -ENOENT;
1095 if (nlh->nlmsg_flags & NLM_F_CREATE)
1096 err = ctnetlink_create_conntrack(cda,
1097 &otuple,
1098 &rtuple,
1099 master_ct);
1100 if (err < 0 && master_ct)
1101 nf_ct_put(master_ct);
1102
1103 return err;
1104 }
1105 /* implicit 'else' */
1106
1107 /* We manipulate the conntrack inside the global conntrack table lock,
1108 * so there's no need to increase the refcount */
1109 err = -EEXIST;
1110 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1111 /* we only allow nat config for new conntracks */
1112 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1113 err = -EINVAL;
1114 goto out_unlock;
1115 }
1116 /* can't link an existing conntrack to a master */
1117 if (cda[CTA_TUPLE_MASTER]) {
1118 err = -EINVAL;
1119 goto out_unlock;
1120 }
1121 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1122 cda);
1123 }
1124
1125 out_unlock:
1126 write_unlock_bh(&nf_conntrack_lock);
1127 return err;
1128 }
1129
1130 /***********************************************************************
1131 * EXPECT
1132 ***********************************************************************/
1133
1134 static inline int
1135 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1136 const struct nf_conntrack_tuple *tuple,
1137 enum ctattr_expect type)
1138 {
1139 struct nlattr *nest_parms;
1140
1141 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1142 if (!nest_parms)
1143 goto nla_put_failure;
1144 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1145 goto nla_put_failure;
1146 nla_nest_end(skb, nest_parms);
1147
1148 return 0;
1149
1150 nla_put_failure:
1151 return -1;
1152 }
1153
1154 static inline int
1155 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1156 const struct nf_conntrack_tuple *tuple,
1157 const struct nf_conntrack_tuple_mask *mask)
1158 {
1159 int ret;
1160 struct nf_conntrack_l3proto *l3proto;
1161 struct nf_conntrack_l4proto *l4proto;
1162 struct nf_conntrack_tuple m;
1163 struct nlattr *nest_parms;
1164
1165 memset(&m, 0xFF, sizeof(m));
1166 m.src.u.all = mask->src.u.all;
1167 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1168
1169 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1170 if (!nest_parms)
1171 goto nla_put_failure;
1172
1173 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1174 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1175 nf_ct_l3proto_put(l3proto);
1176
1177 if (unlikely(ret < 0))
1178 goto nla_put_failure;
1179
1180 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1181 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1182 nf_ct_l4proto_put(l4proto);
1183 if (unlikely(ret < 0))
1184 goto nla_put_failure;
1185
1186 nla_nest_end(skb, nest_parms);
1187
1188 return 0;
1189
1190 nla_put_failure:
1191 return -1;
1192 }
1193
1194 static inline int
1195 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1196 const struct nf_conntrack_expect *exp)
1197 {
1198 struct nf_conn *master = exp->master;
1199 __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1200 __be32 id = htonl((unsigned long)exp);
1201
1202 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1203 goto nla_put_failure;
1204 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1205 goto nla_put_failure;
1206 if (ctnetlink_exp_dump_tuple(skb,
1207 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1208 CTA_EXPECT_MASTER) < 0)
1209 goto nla_put_failure;
1210
1211 NLA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1212 NLA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1213
1214 return 0;
1215
1216 nla_put_failure:
1217 return -1;
1218 }
1219
1220 static int
1221 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1222 int event,
1223 int nowait,
1224 const struct nf_conntrack_expect *exp)
1225 {
1226 struct nlmsghdr *nlh;
1227 struct nfgenmsg *nfmsg;
1228 unsigned char *b = skb_tail_pointer(skb);
1229
1230 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1231 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1232 nfmsg = NLMSG_DATA(nlh);
1233
1234 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1235 nfmsg->nfgen_family = exp->tuple.src.l3num;
1236 nfmsg->version = NFNETLINK_V0;
1237 nfmsg->res_id = 0;
1238
1239 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1240 goto nla_put_failure;
1241
1242 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1243 return skb->len;
1244
1245 nlmsg_failure:
1246 nla_put_failure:
1247 nlmsg_trim(skb, b);
1248 return -1;
1249 }
1250
1251 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1252 static int ctnetlink_expect_event(struct notifier_block *this,
1253 unsigned long events, void *ptr)
1254 {
1255 struct nlmsghdr *nlh;
1256 struct nfgenmsg *nfmsg;
1257 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1258 struct sk_buff *skb;
1259 unsigned int type;
1260 sk_buff_data_t b;
1261 int flags = 0;
1262
1263 if (events & IPEXP_NEW) {
1264 type = IPCTNL_MSG_EXP_NEW;
1265 flags = NLM_F_CREATE|NLM_F_EXCL;
1266 } else
1267 return NOTIFY_DONE;
1268
1269 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
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 nla_put_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 nla_put_failure:
1296 kfree_skb(skb);
1297 return NOTIFY_DONE;
1298 }
1299 #endif
1300 static int ctnetlink_exp_done(struct netlink_callback *cb)
1301 {
1302 if (cb->args[1])
1303 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1304 return 0;
1305 }
1306
1307 static int
1308 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1309 {
1310 struct nf_conntrack_expect *exp, *last;
1311 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1312 struct hlist_node *n;
1313 u_int8_t l3proto = nfmsg->nfgen_family;
1314
1315 read_lock_bh(&nf_conntrack_lock);
1316 last = (struct nf_conntrack_expect *)cb->args[1];
1317 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1318 restart:
1319 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1320 hnode) {
1321 if (l3proto && exp->tuple.src.l3num != l3proto)
1322 continue;
1323 if (cb->args[1]) {
1324 if (exp != last)
1325 continue;
1326 cb->args[1] = 0;
1327 }
1328 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1329 cb->nlh->nlmsg_seq,
1330 IPCTNL_MSG_EXP_NEW,
1331 1, exp) < 0) {
1332 atomic_inc(&exp->use);
1333 cb->args[1] = (unsigned long)exp;
1334 goto out;
1335 }
1336 }
1337 if (cb->args[1]) {
1338 cb->args[1] = 0;
1339 goto restart;
1340 }
1341 }
1342 out:
1343 read_unlock_bh(&nf_conntrack_lock);
1344 if (last)
1345 nf_ct_expect_put(last);
1346
1347 return skb->len;
1348 }
1349
1350 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1351 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1352 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1353 };
1354
1355 static int
1356 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1357 struct nlmsghdr *nlh, struct nlattr *cda[])
1358 {
1359 struct nf_conntrack_tuple tuple;
1360 struct nf_conntrack_expect *exp;
1361 struct sk_buff *skb2;
1362 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1363 u_int8_t u3 = nfmsg->nfgen_family;
1364 int err = 0;
1365
1366 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1367 return netlink_dump_start(ctnl, skb, nlh,
1368 ctnetlink_exp_dump_table,
1369 ctnetlink_exp_done);
1370 }
1371
1372 if (cda[CTA_EXPECT_MASTER])
1373 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1374 else
1375 return -EINVAL;
1376
1377 if (err < 0)
1378 return err;
1379
1380 exp = nf_ct_expect_find_get(&tuple);
1381 if (!exp)
1382 return -ENOENT;
1383
1384 if (cda[CTA_EXPECT_ID]) {
1385 __be32 id = *(__be32 *)nla_data(cda[CTA_EXPECT_ID]);
1386 if (ntohl(id) != (u32)(unsigned long)exp) {
1387 nf_ct_expect_put(exp);
1388 return -ENOENT;
1389 }
1390 }
1391
1392 err = -ENOMEM;
1393 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1394 if (!skb2)
1395 goto out;
1396
1397 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1398 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1399 1, exp);
1400 if (err <= 0)
1401 goto free;
1402
1403 nf_ct_expect_put(exp);
1404
1405 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1406
1407 free:
1408 kfree_skb(skb2);
1409 out:
1410 nf_ct_expect_put(exp);
1411 return err;
1412 }
1413
1414 static int
1415 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1416 struct nlmsghdr *nlh, struct nlattr *cda[])
1417 {
1418 struct nf_conntrack_expect *exp;
1419 struct nf_conntrack_tuple tuple;
1420 struct nf_conntrack_helper *h;
1421 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1422 struct hlist_node *n, *next;
1423 u_int8_t u3 = nfmsg->nfgen_family;
1424 unsigned int i;
1425 int err;
1426
1427 if (cda[CTA_EXPECT_TUPLE]) {
1428 /* delete a single expect by tuple */
1429 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1430 if (err < 0)
1431 return err;
1432
1433 /* bump usage count to 2 */
1434 exp = nf_ct_expect_find_get(&tuple);
1435 if (!exp)
1436 return -ENOENT;
1437
1438 if (cda[CTA_EXPECT_ID]) {
1439 __be32 id = *(__be32 *)nla_data(cda[CTA_EXPECT_ID]);
1440 if (ntohl(id) != (u32)(unsigned long)exp) {
1441 nf_ct_expect_put(exp);
1442 return -ENOENT;
1443 }
1444 }
1445
1446 /* after list removal, usage count == 1 */
1447 nf_ct_unexpect_related(exp);
1448 /* have to put what we 'get' above.
1449 * after this line usage count == 0 */
1450 nf_ct_expect_put(exp);
1451 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1452 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1453 struct nf_conn_help *m_help;
1454
1455 /* delete all expectations for this helper */
1456 write_lock_bh(&nf_conntrack_lock);
1457 h = __nf_conntrack_helper_find_byname(name);
1458 if (!h) {
1459 write_unlock_bh(&nf_conntrack_lock);
1460 return -EINVAL;
1461 }
1462 for (i = 0; i < nf_ct_expect_hsize; i++) {
1463 hlist_for_each_entry_safe(exp, n, next,
1464 &nf_ct_expect_hash[i],
1465 hnode) {
1466 m_help = nfct_help(exp->master);
1467 if (m_help->helper == h
1468 && del_timer(&exp->timeout)) {
1469 nf_ct_unlink_expect(exp);
1470 nf_ct_expect_put(exp);
1471 }
1472 }
1473 }
1474 write_unlock_bh(&nf_conntrack_lock);
1475 } else {
1476 /* This basically means we have to flush everything*/
1477 write_lock_bh(&nf_conntrack_lock);
1478 for (i = 0; i < nf_ct_expect_hsize; i++) {
1479 hlist_for_each_entry_safe(exp, n, next,
1480 &nf_ct_expect_hash[i],
1481 hnode) {
1482 if (del_timer(&exp->timeout)) {
1483 nf_ct_unlink_expect(exp);
1484 nf_ct_expect_put(exp);
1485 }
1486 }
1487 }
1488 write_unlock_bh(&nf_conntrack_lock);
1489 }
1490
1491 return 0;
1492 }
1493 static int
1494 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1495 {
1496 return -EOPNOTSUPP;
1497 }
1498
1499 static int
1500 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1501 {
1502 struct nf_conntrack_tuple tuple, mask, master_tuple;
1503 struct nf_conntrack_tuple_hash *h = NULL;
1504 struct nf_conntrack_expect *exp;
1505 struct nf_conn *ct;
1506 struct nf_conn_help *help;
1507 int err = 0;
1508
1509 /* caller guarantees that those three CTA_EXPECT_* exist */
1510 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1511 if (err < 0)
1512 return err;
1513 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1514 if (err < 0)
1515 return err;
1516 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1517 if (err < 0)
1518 return err;
1519
1520 /* Look for master conntrack of this expectation */
1521 h = nf_conntrack_find_get(&master_tuple);
1522 if (!h)
1523 return -ENOENT;
1524 ct = nf_ct_tuplehash_to_ctrack(h);
1525 help = nfct_help(ct);
1526
1527 if (!help || !help->helper) {
1528 /* such conntrack hasn't got any helper, abort */
1529 err = -EINVAL;
1530 goto out;
1531 }
1532
1533 exp = nf_ct_expect_alloc(ct);
1534 if (!exp) {
1535 err = -ENOMEM;
1536 goto out;
1537 }
1538
1539 exp->expectfn = NULL;
1540 exp->flags = 0;
1541 exp->master = ct;
1542 exp->helper = NULL;
1543 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1544 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1545 exp->mask.src.u.all = mask.src.u.all;
1546
1547 err = nf_ct_expect_related(exp);
1548 nf_ct_expect_put(exp);
1549
1550 out:
1551 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1552 return err;
1553 }
1554
1555 static int
1556 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1557 struct nlmsghdr *nlh, struct nlattr *cda[])
1558 {
1559 struct nf_conntrack_tuple tuple;
1560 struct nf_conntrack_expect *exp;
1561 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1562 u_int8_t u3 = nfmsg->nfgen_family;
1563 int err = 0;
1564
1565 if (!cda[CTA_EXPECT_TUPLE]
1566 || !cda[CTA_EXPECT_MASK]
1567 || !cda[CTA_EXPECT_MASTER])
1568 return -EINVAL;
1569
1570 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1571 if (err < 0)
1572 return err;
1573
1574 write_lock_bh(&nf_conntrack_lock);
1575 exp = __nf_ct_expect_find(&tuple);
1576
1577 if (!exp) {
1578 write_unlock_bh(&nf_conntrack_lock);
1579 err = -ENOENT;
1580 if (nlh->nlmsg_flags & NLM_F_CREATE)
1581 err = ctnetlink_create_expect(cda, u3);
1582 return err;
1583 }
1584
1585 err = -EEXIST;
1586 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1587 err = ctnetlink_change_expect(exp, cda);
1588 write_unlock_bh(&nf_conntrack_lock);
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 const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1604 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1605 .attr_count = CTA_MAX,
1606 .policy = ct_nla_policy },
1607 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1608 .attr_count = CTA_MAX,
1609 .policy = ct_nla_policy },
1610 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1611 .attr_count = CTA_MAX,
1612 .policy = ct_nla_policy },
1613 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1614 .attr_count = CTA_MAX,
1615 .policy = ct_nla_policy },
1616 };
1617
1618 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1619 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1620 .attr_count = CTA_EXPECT_MAX,
1621 .policy = exp_nla_policy },
1622 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1623 .attr_count = CTA_EXPECT_MAX,
1624 .policy = exp_nla_policy },
1625 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1626 .attr_count = CTA_EXPECT_MAX,
1627 .policy = exp_nla_policy },
1628 };
1629
1630 static const struct nfnetlink_subsystem ctnl_subsys = {
1631 .name = "conntrack",
1632 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1633 .cb_count = IPCTNL_MSG_MAX,
1634 .cb = ctnl_cb,
1635 };
1636
1637 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1638 .name = "conntrack_expect",
1639 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1640 .cb_count = IPCTNL_MSG_EXP_MAX,
1641 .cb = ctnl_exp_cb,
1642 };
1643
1644 MODULE_ALIAS("ip_conntrack_netlink");
1645 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1646 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1647
1648 static int __init ctnetlink_init(void)
1649 {
1650 int ret;
1651
1652 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1653 ret = nfnetlink_subsys_register(&ctnl_subsys);
1654 if (ret < 0) {
1655 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1656 goto err_out;
1657 }
1658
1659 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1660 if (ret < 0) {
1661 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1662 goto err_unreg_subsys;
1663 }
1664
1665 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1666 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1667 if (ret < 0) {
1668 printk("ctnetlink_init: cannot register notifier.\n");
1669 goto err_unreg_exp_subsys;
1670 }
1671
1672 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1673 if (ret < 0) {
1674 printk("ctnetlink_init: cannot expect register notifier.\n");
1675 goto err_unreg_notifier;
1676 }
1677 #endif
1678
1679 return 0;
1680
1681 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1682 err_unreg_notifier:
1683 nf_conntrack_unregister_notifier(&ctnl_notifier);
1684 err_unreg_exp_subsys:
1685 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1686 #endif
1687 err_unreg_subsys:
1688 nfnetlink_subsys_unregister(&ctnl_subsys);
1689 err_out:
1690 return ret;
1691 }
1692
1693 static void __exit ctnetlink_exit(void)
1694 {
1695 printk("ctnetlink: unregistering from nfnetlink.\n");
1696
1697 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1698 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1699 nf_conntrack_unregister_notifier(&ctnl_notifier);
1700 #endif
1701
1702 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1703 nfnetlink_subsys_unregister(&ctnl_subsys);
1704 return;
1705 }
1706
1707 module_init(ctnetlink_init);
1708 module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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