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[NETFILTER]: nf_conntrack_netlink: clean up NAT protocol parsing
[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_U8(skb, CTA_PROTO_NUM, 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 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 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
124 return 0;
125
126 nla_put_failure:
127 return -1;
128 }
129
130 static inline int
131 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
132 {
133 long timeout = (ct->timeout.expires - jiffies) / HZ;
134
135 if (timeout < 0)
136 timeout = 0;
137
138 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
139 return 0;
140
141 nla_put_failure:
142 return -1;
143 }
144
145 static inline int
146 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
147 {
148 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);
149 struct nlattr *nest_proto;
150 int ret;
151
152 if (!l4proto->to_nlattr) {
153 nf_ct_l4proto_put(l4proto);
154 return 0;
155 }
156
157 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
158 if (!nest_proto)
159 goto nla_put_failure;
160
161 ret = l4proto->to_nlattr(skb, nest_proto, ct);
162
163 nf_ct_l4proto_put(l4proto);
164
165 nla_nest_end(skb, nest_proto);
166
167 return ret;
168
169 nla_put_failure:
170 nf_ct_l4proto_put(l4proto);
171 return -1;
172 }
173
174 static inline int
175 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
176 {
177 struct nlattr *nest_helper;
178 const struct nf_conn_help *help = nfct_help(ct);
179 struct nf_conntrack_helper *helper;
180
181 if (!help)
182 return 0;
183
184 rcu_read_lock();
185 helper = rcu_dereference(help->helper);
186 if (!helper)
187 goto out;
188
189 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
190 if (!nest_helper)
191 goto nla_put_failure;
192 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
193
194 if (helper->to_nlattr)
195 helper->to_nlattr(skb, ct);
196
197 nla_nest_end(skb, nest_helper);
198 out:
199 rcu_read_unlock();
200 return 0;
201
202 nla_put_failure:
203 rcu_read_unlock();
204 return -1;
205 }
206
207 #ifdef CONFIG_NF_CT_ACCT
208 static int
209 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
210 enum ip_conntrack_dir dir)
211 {
212 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
213 struct nlattr *nest_count;
214
215 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
216 if (!nest_count)
217 goto nla_put_failure;
218
219 NLA_PUT_BE32(skb, CTA_COUNTERS32_PACKETS,
220 htonl(ct->counters[dir].packets));
221 NLA_PUT_BE32(skb, CTA_COUNTERS32_BYTES,
222 htonl(ct->counters[dir].bytes));
223
224 nla_nest_end(skb, nest_count);
225
226 return 0;
227
228 nla_put_failure:
229 return -1;
230 }
231 #else
232 #define ctnetlink_dump_counters(a, b, c) (0)
233 #endif
234
235 #ifdef CONFIG_NF_CONNTRACK_MARK
236 static inline int
237 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
238 {
239 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
240 return 0;
241
242 nla_put_failure:
243 return -1;
244 }
245 #else
246 #define ctnetlink_dump_mark(a, b) (0)
247 #endif
248
249 #ifdef CONFIG_NF_CONNTRACK_SECMARK
250 static inline int
251 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
252 {
253 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
254 return 0;
255
256 nla_put_failure:
257 return -1;
258 }
259 #else
260 #define ctnetlink_dump_secmark(a, b) (0)
261 #endif
262
263 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
264
265 static inline int
266 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
267 {
268 struct nlattr *nest_parms;
269
270 if (!(ct->status & IPS_EXPECTED))
271 return 0;
272
273 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
274 if (!nest_parms)
275 goto nla_put_failure;
276 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
277 goto nla_put_failure;
278 nla_nest_end(skb, nest_parms);
279
280 return 0;
281
282 nla_put_failure:
283 return -1;
284 }
285
286 #ifdef CONFIG_NF_NAT_NEEDED
287 static int
288 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
289 {
290 struct nlattr *nest_parms;
291
292 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
293 if (!nest_parms)
294 goto nla_put_failure;
295
296 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
297 htonl(natseq->correction_pos));
298 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
299 htonl(natseq->offset_before));
300 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
301 htonl(natseq->offset_after));
302
303 nla_nest_end(skb, nest_parms);
304
305 return 0;
306
307 nla_put_failure:
308 return -1;
309 }
310
311 static inline int
312 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
313 {
314 struct nf_nat_seq *natseq;
315 struct nf_conn_nat *nat = nfct_nat(ct);
316
317 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
318 return 0;
319
320 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
321 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
322 return -1;
323
324 natseq = &nat->seq[IP_CT_DIR_REPLY];
325 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
326 return -1;
327
328 return 0;
329 }
330 #else
331 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
332 #endif
333
334 static inline int
335 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
336 {
337 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
338 return 0;
339
340 nla_put_failure:
341 return -1;
342 }
343
344 static inline int
345 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
346 {
347 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
348 return 0;
349
350 nla_put_failure:
351 return -1;
352 }
353
354 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
355
356 static int
357 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
358 int event, int nowait,
359 const struct nf_conn *ct)
360 {
361 struct nlmsghdr *nlh;
362 struct nfgenmsg *nfmsg;
363 struct nlattr *nest_parms;
364 unsigned char *b = skb_tail_pointer(skb);
365
366 event |= NFNL_SUBSYS_CTNETLINK << 8;
367 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
368 nfmsg = NLMSG_DATA(nlh);
369
370 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
371 nfmsg->nfgen_family =
372 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
373 nfmsg->version = NFNETLINK_V0;
374 nfmsg->res_id = 0;
375
376 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
377 if (!nest_parms)
378 goto nla_put_failure;
379 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
380 goto nla_put_failure;
381 nla_nest_end(skb, nest_parms);
382
383 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
384 if (!nest_parms)
385 goto nla_put_failure;
386 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
387 goto nla_put_failure;
388 nla_nest_end(skb, nest_parms);
389
390 if (ctnetlink_dump_status(skb, ct) < 0 ||
391 ctnetlink_dump_timeout(skb, ct) < 0 ||
392 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
393 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
394 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
395 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
396 ctnetlink_dump_mark(skb, ct) < 0 ||
397 ctnetlink_dump_secmark(skb, ct) < 0 ||
398 ctnetlink_dump_id(skb, ct) < 0 ||
399 ctnetlink_dump_use(skb, ct) < 0 ||
400 ctnetlink_dump_master(skb, ct) < 0 ||
401 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
402 goto nla_put_failure;
403
404 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
405 return skb->len;
406
407 nlmsg_failure:
408 nla_put_failure:
409 nlmsg_trim(skb, b);
410 return -1;
411 }
412
413 #ifdef CONFIG_NF_CONNTRACK_EVENTS
414 static int ctnetlink_conntrack_event(struct notifier_block *this,
415 unsigned long events, void *ptr)
416 {
417 struct nlmsghdr *nlh;
418 struct nfgenmsg *nfmsg;
419 struct nlattr *nest_parms;
420 struct nf_conn *ct = (struct nf_conn *)ptr;
421 struct sk_buff *skb;
422 unsigned int type;
423 sk_buff_data_t b;
424 unsigned int flags = 0, group;
425
426 /* ignore our fake conntrack entry */
427 if (ct == &nf_conntrack_untracked)
428 return NOTIFY_DONE;
429
430 if (events & IPCT_DESTROY) {
431 type = IPCTNL_MSG_CT_DELETE;
432 group = NFNLGRP_CONNTRACK_DESTROY;
433 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
434 type = IPCTNL_MSG_CT_NEW;
435 flags = NLM_F_CREATE|NLM_F_EXCL;
436 group = NFNLGRP_CONNTRACK_NEW;
437 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
438 type = IPCTNL_MSG_CT_NEW;
439 group = NFNLGRP_CONNTRACK_UPDATE;
440 } else
441 return NOTIFY_DONE;
442
443 if (!nfnetlink_has_listeners(group))
444 return NOTIFY_DONE;
445
446 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
447 if (!skb)
448 return NOTIFY_DONE;
449
450 b = skb->tail;
451
452 type |= NFNL_SUBSYS_CTNETLINK << 8;
453 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
454 nfmsg = NLMSG_DATA(nlh);
455
456 nlh->nlmsg_flags = flags;
457 nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
458 nfmsg->version = NFNETLINK_V0;
459 nfmsg->res_id = 0;
460
461 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
462 if (!nest_parms)
463 goto nla_put_failure;
464 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
465 goto nla_put_failure;
466 nla_nest_end(skb, nest_parms);
467
468 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
469 if (!nest_parms)
470 goto nla_put_failure;
471 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
472 goto nla_put_failure;
473 nla_nest_end(skb, nest_parms);
474
475 if (events & IPCT_DESTROY) {
476 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
477 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
478 goto nla_put_failure;
479 } else {
480 if (ctnetlink_dump_status(skb, ct) < 0)
481 goto nla_put_failure;
482
483 if (ctnetlink_dump_timeout(skb, ct) < 0)
484 goto nla_put_failure;
485
486 if (events & IPCT_PROTOINFO
487 && ctnetlink_dump_protoinfo(skb, ct) < 0)
488 goto nla_put_failure;
489
490 if ((events & IPCT_HELPER || nfct_help(ct))
491 && ctnetlink_dump_helpinfo(skb, ct) < 0)
492 goto nla_put_failure;
493
494 #ifdef CONFIG_NF_CONNTRACK_SECMARK
495 if ((events & IPCT_SECMARK || ct->secmark)
496 && ctnetlink_dump_secmark(skb, ct) < 0)
497 goto nla_put_failure;
498 #endif
499
500 if (events & IPCT_COUNTER_FILLING &&
501 (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
502 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
503 goto nla_put_failure;
504
505 if (events & IPCT_RELATED &&
506 ctnetlink_dump_master(skb, ct) < 0)
507 goto nla_put_failure;
508
509 if (events & IPCT_NATSEQADJ &&
510 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
511 goto nla_put_failure;
512 }
513
514 #ifdef CONFIG_NF_CONNTRACK_MARK
515 if ((events & IPCT_MARK || ct->mark)
516 && ctnetlink_dump_mark(skb, ct) < 0)
517 goto nla_put_failure;
518 #endif
519
520 nlh->nlmsg_len = skb->tail - b;
521 nfnetlink_send(skb, 0, group, 0);
522 return NOTIFY_DONE;
523
524 nlmsg_failure:
525 nla_put_failure:
526 kfree_skb(skb);
527 return NOTIFY_DONE;
528 }
529 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
530
531 static int ctnetlink_done(struct netlink_callback *cb)
532 {
533 if (cb->args[1])
534 nf_ct_put((struct nf_conn *)cb->args[1]);
535 return 0;
536 }
537
538 #define L3PROTO(ct) (ct)->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
539
540 static int
541 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
542 {
543 struct nf_conn *ct, *last;
544 struct nf_conntrack_tuple_hash *h;
545 struct hlist_node *n;
546 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
547 u_int8_t l3proto = nfmsg->nfgen_family;
548
549 rcu_read_lock();
550 last = (struct nf_conn *)cb->args[1];
551 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
552 restart:
553 hlist_for_each_entry_rcu(h, n, &nf_conntrack_hash[cb->args[0]],
554 hnode) {
555 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
556 continue;
557 ct = nf_ct_tuplehash_to_ctrack(h);
558 /* Dump entries of a given L3 protocol number.
559 * If it is not specified, ie. l3proto == 0,
560 * then dump everything. */
561 if (l3proto && L3PROTO(ct) != l3proto)
562 continue;
563 if (cb->args[1]) {
564 if (ct != last)
565 continue;
566 cb->args[1] = 0;
567 }
568 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
569 cb->nlh->nlmsg_seq,
570 IPCTNL_MSG_CT_NEW,
571 1, ct) < 0) {
572 if (!atomic_inc_not_zero(&ct->ct_general.use))
573 continue;
574 cb->args[1] = (unsigned long)ct;
575 goto out;
576 }
577 #ifdef CONFIG_NF_CT_ACCT
578 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
579 IPCTNL_MSG_CT_GET_CTRZERO)
580 memset(&ct->counters, 0, sizeof(ct->counters));
581 #endif
582 }
583 if (cb->args[1]) {
584 cb->args[1] = 0;
585 goto restart;
586 }
587 }
588 out:
589 rcu_read_unlock();
590 if (last)
591 nf_ct_put(last);
592
593 return skb->len;
594 }
595
596 static inline int
597 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
598 {
599 struct nlattr *tb[CTA_IP_MAX+1];
600 struct nf_conntrack_l3proto *l3proto;
601 int ret = 0;
602
603 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
604
605 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
606
607 if (likely(l3proto->nlattr_to_tuple)) {
608 ret = nla_validate_nested(attr, CTA_IP_MAX,
609 l3proto->nla_policy);
610 if (ret == 0)
611 ret = l3proto->nlattr_to_tuple(tb, tuple);
612 }
613
614 nf_ct_l3proto_put(l3proto);
615
616 return ret;
617 }
618
619 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
620 [CTA_PROTO_NUM] = { .type = NLA_U8 },
621 };
622
623 static inline int
624 ctnetlink_parse_tuple_proto(struct nlattr *attr,
625 struct nf_conntrack_tuple *tuple)
626 {
627 struct nlattr *tb[CTA_PROTO_MAX+1];
628 struct nf_conntrack_l4proto *l4proto;
629 int ret = 0;
630
631 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
632 if (ret < 0)
633 return ret;
634
635 if (!tb[CTA_PROTO_NUM])
636 return -EINVAL;
637 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
638
639 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
640
641 if (likely(l4proto->nlattr_to_tuple)) {
642 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
643 l4proto->nla_policy);
644 if (ret == 0)
645 ret = l4proto->nlattr_to_tuple(tb, tuple);
646 }
647
648 nf_ct_l4proto_put(l4proto);
649
650 return ret;
651 }
652
653 static int
654 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
655 enum ctattr_tuple type, u_int8_t l3num)
656 {
657 struct nlattr *tb[CTA_TUPLE_MAX+1];
658 int err;
659
660 memset(tuple, 0, sizeof(*tuple));
661
662 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
663
664 if (!tb[CTA_TUPLE_IP])
665 return -EINVAL;
666
667 tuple->src.l3num = l3num;
668
669 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
670 if (err < 0)
671 return err;
672
673 if (!tb[CTA_TUPLE_PROTO])
674 return -EINVAL;
675
676 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
677 if (err < 0)
678 return err;
679
680 /* orig and expect tuples get DIR_ORIGINAL */
681 if (type == CTA_TUPLE_REPLY)
682 tuple->dst.dir = IP_CT_DIR_REPLY;
683 else
684 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
685
686 return 0;
687 }
688
689 #ifdef CONFIG_NF_NAT_NEEDED
690 static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
691 [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 },
692 [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 },
693 };
694
695 static int nfnetlink_parse_nat_proto(struct nlattr *attr,
696 const struct nf_conn *ct,
697 struct nf_nat_range *range)
698 {
699 struct nlattr *tb[CTA_PROTONAT_MAX+1];
700 const struct nf_nat_protocol *npt;
701 int err;
702
703 err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
704 if (err < 0)
705 return err;
706
707 npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
708 if (npt->nlattr_to_range)
709 err = npt->nlattr_to_range(tb, range);
710 nf_nat_proto_put(npt);
711 return err;
712 }
713
714 static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
715 [CTA_NAT_MINIP] = { .type = NLA_U32 },
716 [CTA_NAT_MAXIP] = { .type = NLA_U32 },
717 };
718
719 static inline int
720 nfnetlink_parse_nat(struct nlattr *nat,
721 const struct nf_conn *ct, struct nf_nat_range *range)
722 {
723 struct nlattr *tb[CTA_NAT_MAX+1];
724 int err;
725
726 memset(range, 0, sizeof(*range));
727
728 err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
729 if (err < 0)
730 return err;
731
732 if (tb[CTA_NAT_MINIP])
733 range->min_ip = nla_get_be32(tb[CTA_NAT_MINIP]);
734
735 if (!tb[CTA_NAT_MAXIP])
736 range->max_ip = range->min_ip;
737 else
738 range->max_ip = nla_get_be32(tb[CTA_NAT_MAXIP]);
739
740 if (range->min_ip)
741 range->flags |= IP_NAT_RANGE_MAP_IPS;
742
743 if (!tb[CTA_NAT_PROTO])
744 return 0;
745
746 err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
747 if (err < 0)
748 return err;
749
750 return 0;
751 }
752 #endif
753
754 static inline int
755 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
756 {
757 struct nlattr *tb[CTA_HELP_MAX+1];
758
759 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
760
761 if (!tb[CTA_HELP_NAME])
762 return -EINVAL;
763
764 *helper_name = nla_data(tb[CTA_HELP_NAME]);
765
766 return 0;
767 }
768
769 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
770 [CTA_STATUS] = { .type = NLA_U32 },
771 [CTA_TIMEOUT] = { .type = NLA_U32 },
772 [CTA_MARK] = { .type = NLA_U32 },
773 [CTA_USE] = { .type = NLA_U32 },
774 [CTA_ID] = { .type = NLA_U32 },
775 };
776
777 static int
778 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
779 struct nlmsghdr *nlh, struct nlattr *cda[])
780 {
781 struct nf_conntrack_tuple_hash *h;
782 struct nf_conntrack_tuple tuple;
783 struct nf_conn *ct;
784 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
785 u_int8_t u3 = nfmsg->nfgen_family;
786 int err = 0;
787
788 if (cda[CTA_TUPLE_ORIG])
789 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
790 else if (cda[CTA_TUPLE_REPLY])
791 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
792 else {
793 /* Flush the whole table */
794 nf_conntrack_flush();
795 return 0;
796 }
797
798 if (err < 0)
799 return err;
800
801 h = nf_conntrack_find_get(&tuple);
802 if (!h)
803 return -ENOENT;
804
805 ct = nf_ct_tuplehash_to_ctrack(h);
806
807 if (cda[CTA_ID]) {
808 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
809 if (id != (u32)(unsigned long)ct) {
810 nf_ct_put(ct);
811 return -ENOENT;
812 }
813 }
814 if (del_timer(&ct->timeout))
815 ct->timeout.function((unsigned long)ct);
816
817 nf_ct_put(ct);
818
819 return 0;
820 }
821
822 static int
823 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
824 struct nlmsghdr *nlh, struct nlattr *cda[])
825 {
826 struct nf_conntrack_tuple_hash *h;
827 struct nf_conntrack_tuple tuple;
828 struct nf_conn *ct;
829 struct sk_buff *skb2 = NULL;
830 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
831 u_int8_t u3 = nfmsg->nfgen_family;
832 int err = 0;
833
834 if (nlh->nlmsg_flags & NLM_F_DUMP) {
835 #ifndef CONFIG_NF_CT_ACCT
836 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
837 return -ENOTSUPP;
838 #endif
839 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
840 ctnetlink_done);
841 }
842
843 if (cda[CTA_TUPLE_ORIG])
844 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
845 else if (cda[CTA_TUPLE_REPLY])
846 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
847 else
848 return -EINVAL;
849
850 if (err < 0)
851 return err;
852
853 h = nf_conntrack_find_get(&tuple);
854 if (!h)
855 return -ENOENT;
856
857 ct = nf_ct_tuplehash_to_ctrack(h);
858
859 err = -ENOMEM;
860 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
861 if (!skb2) {
862 nf_ct_put(ct);
863 return -ENOMEM;
864 }
865
866 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
867 IPCTNL_MSG_CT_NEW, 1, ct);
868 nf_ct_put(ct);
869 if (err <= 0)
870 goto free;
871
872 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
873 if (err < 0)
874 goto out;
875
876 return 0;
877
878 free:
879 kfree_skb(skb2);
880 out:
881 return err;
882 }
883
884 static int
885 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
886 {
887 unsigned long d;
888 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
889 d = ct->status ^ status;
890
891 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
892 /* unchangeable */
893 return -EINVAL;
894
895 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
896 /* SEEN_REPLY bit can only be set */
897 return -EINVAL;
898
899
900 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
901 /* ASSURED bit can only be set */
902 return -EINVAL;
903
904 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
905 #ifndef CONFIG_NF_NAT_NEEDED
906 return -EINVAL;
907 #else
908 struct nf_nat_range range;
909
910 if (cda[CTA_NAT_DST]) {
911 if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
912 &range) < 0)
913 return -EINVAL;
914 if (nf_nat_initialized(ct, IP_NAT_MANIP_DST))
915 return -EEXIST;
916 nf_nat_setup_info(ct, &range, IP_NAT_MANIP_DST);
917 }
918 if (cda[CTA_NAT_SRC]) {
919 if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
920 &range) < 0)
921 return -EINVAL;
922 if (nf_nat_initialized(ct, IP_NAT_MANIP_SRC))
923 return -EEXIST;
924 nf_nat_setup_info(ct, &range, IP_NAT_MANIP_SRC);
925 }
926 #endif
927 }
928
929 /* Be careful here, modifying NAT bits can screw up things,
930 * so don't let users modify them directly if they don't pass
931 * nf_nat_range. */
932 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
933 return 0;
934 }
935
936
937 static inline int
938 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
939 {
940 struct nf_conntrack_helper *helper;
941 struct nf_conn_help *help = nfct_help(ct);
942 char *helpname;
943 int err;
944
945 /* don't change helper of sibling connections */
946 if (ct->master)
947 return -EINVAL;
948
949 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
950 if (err < 0)
951 return err;
952
953 if (!strcmp(helpname, "")) {
954 if (help && help->helper) {
955 /* we had a helper before ... */
956 nf_ct_remove_expectations(ct);
957 rcu_assign_pointer(help->helper, NULL);
958 }
959
960 return 0;
961 }
962
963 helper = __nf_conntrack_helper_find_byname(helpname);
964 if (helper == NULL)
965 return -EINVAL;
966
967 if (help) {
968 if (help->helper == helper)
969 return 0;
970 if (help->helper)
971 return -EBUSY;
972 /* need to zero data of old helper */
973 memset(&help->help, 0, sizeof(help->help));
974 } else {
975 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
976 if (help == NULL)
977 return -ENOMEM;
978 }
979
980 rcu_assign_pointer(help->helper, helper);
981
982 return 0;
983 }
984
985 static inline int
986 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
987 {
988 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
989
990 if (!del_timer(&ct->timeout))
991 return -ETIME;
992
993 ct->timeout.expires = jiffies + timeout * HZ;
994 add_timer(&ct->timeout);
995
996 return 0;
997 }
998
999 static inline int
1000 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1001 {
1002 struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1003 struct nf_conntrack_l4proto *l4proto;
1004 u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
1005 u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
1006 int err = 0;
1007
1008 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1009
1010 l4proto = nf_ct_l4proto_find_get(l3num, npt);
1011
1012 if (l4proto->from_nlattr)
1013 err = l4proto->from_nlattr(tb, ct);
1014 nf_ct_l4proto_put(l4proto);
1015
1016 return err;
1017 }
1018
1019 #ifdef CONFIG_NF_NAT_NEEDED
1020 static inline int
1021 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1022 {
1023 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1024
1025 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1026
1027 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1028 return -EINVAL;
1029
1030 natseq->correction_pos =
1031 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1032
1033 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1034 return -EINVAL;
1035
1036 natseq->offset_before =
1037 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1038
1039 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1040 return -EINVAL;
1041
1042 natseq->offset_after =
1043 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1044
1045 return 0;
1046 }
1047
1048 static int
1049 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1050 {
1051 int ret = 0;
1052 struct nf_conn_nat *nat = nfct_nat(ct);
1053
1054 if (!nat)
1055 return 0;
1056
1057 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1058 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1059 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1060 if (ret < 0)
1061 return ret;
1062
1063 ct->status |= IPS_SEQ_ADJUST;
1064 }
1065
1066 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1067 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1068 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1069 if (ret < 0)
1070 return ret;
1071
1072 ct->status |= IPS_SEQ_ADJUST;
1073 }
1074
1075 return 0;
1076 }
1077 #endif
1078
1079 static int
1080 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1081 {
1082 int err;
1083
1084 if (cda[CTA_HELP]) {
1085 err = ctnetlink_change_helper(ct, cda);
1086 if (err < 0)
1087 return err;
1088 }
1089
1090 if (cda[CTA_TIMEOUT]) {
1091 err = ctnetlink_change_timeout(ct, cda);
1092 if (err < 0)
1093 return err;
1094 }
1095
1096 if (cda[CTA_STATUS]) {
1097 err = ctnetlink_change_status(ct, cda);
1098 if (err < 0)
1099 return err;
1100 }
1101
1102 if (cda[CTA_PROTOINFO]) {
1103 err = ctnetlink_change_protoinfo(ct, cda);
1104 if (err < 0)
1105 return err;
1106 }
1107
1108 #if defined(CONFIG_NF_CONNTRACK_MARK)
1109 if (cda[CTA_MARK])
1110 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1111 #endif
1112
1113 #ifdef CONFIG_NF_NAT_NEEDED
1114 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1115 err = ctnetlink_change_nat_seq_adj(ct, cda);
1116 if (err < 0)
1117 return err;
1118 }
1119 #endif
1120
1121 return 0;
1122 }
1123
1124 static int
1125 ctnetlink_create_conntrack(struct nlattr *cda[],
1126 struct nf_conntrack_tuple *otuple,
1127 struct nf_conntrack_tuple *rtuple,
1128 struct nf_conn *master_ct)
1129 {
1130 struct nf_conn *ct;
1131 int err = -EINVAL;
1132 struct nf_conn_help *help;
1133 struct nf_conntrack_helper *helper;
1134
1135 ct = nf_conntrack_alloc(otuple, rtuple);
1136 if (ct == NULL || IS_ERR(ct))
1137 return -ENOMEM;
1138
1139 if (!cda[CTA_TIMEOUT])
1140 goto err;
1141 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1142
1143 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1144 ct->status |= IPS_CONFIRMED;
1145
1146 if (cda[CTA_STATUS]) {
1147 err = ctnetlink_change_status(ct, cda);
1148 if (err < 0)
1149 goto err;
1150 }
1151
1152 if (cda[CTA_PROTOINFO]) {
1153 err = ctnetlink_change_protoinfo(ct, cda);
1154 if (err < 0)
1155 goto err;
1156 }
1157
1158 #if defined(CONFIG_NF_CONNTRACK_MARK)
1159 if (cda[CTA_MARK])
1160 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1161 #endif
1162
1163 rcu_read_lock();
1164 helper = __nf_ct_helper_find(rtuple);
1165 if (helper) {
1166 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
1167 if (help == NULL) {
1168 rcu_read_unlock();
1169 err = -ENOMEM;
1170 goto err;
1171 }
1172 /* not in hash table yet so not strictly necessary */
1173 rcu_assign_pointer(help->helper, helper);
1174 }
1175
1176 /* setup master conntrack: this is a confirmed expectation */
1177 if (master_ct) {
1178 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1179 ct->master = master_ct;
1180 }
1181
1182 add_timer(&ct->timeout);
1183 nf_conntrack_hash_insert(ct);
1184 rcu_read_unlock();
1185
1186 return 0;
1187
1188 err:
1189 nf_conntrack_free(ct);
1190 return err;
1191 }
1192
1193 static int
1194 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1195 struct nlmsghdr *nlh, struct nlattr *cda[])
1196 {
1197 struct nf_conntrack_tuple otuple, rtuple;
1198 struct nf_conntrack_tuple_hash *h = NULL;
1199 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1200 u_int8_t u3 = nfmsg->nfgen_family;
1201 int err = 0;
1202
1203 if (cda[CTA_TUPLE_ORIG]) {
1204 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1205 if (err < 0)
1206 return err;
1207 }
1208
1209 if (cda[CTA_TUPLE_REPLY]) {
1210 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1211 if (err < 0)
1212 return err;
1213 }
1214
1215 spin_lock_bh(&nf_conntrack_lock);
1216 if (cda[CTA_TUPLE_ORIG])
1217 h = __nf_conntrack_find(&otuple);
1218 else if (cda[CTA_TUPLE_REPLY])
1219 h = __nf_conntrack_find(&rtuple);
1220
1221 if (h == NULL) {
1222 struct nf_conntrack_tuple master;
1223 struct nf_conntrack_tuple_hash *master_h = NULL;
1224 struct nf_conn *master_ct = NULL;
1225
1226 if (cda[CTA_TUPLE_MASTER]) {
1227 err = ctnetlink_parse_tuple(cda,
1228 &master,
1229 CTA_TUPLE_MASTER,
1230 u3);
1231 if (err < 0)
1232 goto out_unlock;
1233
1234 master_h = __nf_conntrack_find(&master);
1235 if (master_h == NULL) {
1236 err = -ENOENT;
1237 goto out_unlock;
1238 }
1239 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1240 atomic_inc(&master_ct->ct_general.use);
1241 }
1242
1243 spin_unlock_bh(&nf_conntrack_lock);
1244 err = -ENOENT;
1245 if (nlh->nlmsg_flags & NLM_F_CREATE)
1246 err = ctnetlink_create_conntrack(cda,
1247 &otuple,
1248 &rtuple,
1249 master_ct);
1250 if (err < 0 && master_ct)
1251 nf_ct_put(master_ct);
1252
1253 return err;
1254 }
1255 /* implicit 'else' */
1256
1257 /* We manipulate the conntrack inside the global conntrack table lock,
1258 * so there's no need to increase the refcount */
1259 err = -EEXIST;
1260 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1261 /* we only allow nat config for new conntracks */
1262 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1263 err = -EINVAL;
1264 goto out_unlock;
1265 }
1266 /* can't link an existing conntrack to a master */
1267 if (cda[CTA_TUPLE_MASTER]) {
1268 err = -EINVAL;
1269 goto out_unlock;
1270 }
1271 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1272 cda);
1273 }
1274
1275 out_unlock:
1276 spin_unlock_bh(&nf_conntrack_lock);
1277 return err;
1278 }
1279
1280 /***********************************************************************
1281 * EXPECT
1282 ***********************************************************************/
1283
1284 static inline int
1285 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1286 const struct nf_conntrack_tuple *tuple,
1287 enum ctattr_expect type)
1288 {
1289 struct nlattr *nest_parms;
1290
1291 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1292 if (!nest_parms)
1293 goto nla_put_failure;
1294 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1295 goto nla_put_failure;
1296 nla_nest_end(skb, nest_parms);
1297
1298 return 0;
1299
1300 nla_put_failure:
1301 return -1;
1302 }
1303
1304 static inline int
1305 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1306 const struct nf_conntrack_tuple *tuple,
1307 const struct nf_conntrack_tuple_mask *mask)
1308 {
1309 int ret;
1310 struct nf_conntrack_l3proto *l3proto;
1311 struct nf_conntrack_l4proto *l4proto;
1312 struct nf_conntrack_tuple m;
1313 struct nlattr *nest_parms;
1314
1315 memset(&m, 0xFF, sizeof(m));
1316 m.src.u.all = mask->src.u.all;
1317 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1318
1319 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1320 if (!nest_parms)
1321 goto nla_put_failure;
1322
1323 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1324 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1325 nf_ct_l3proto_put(l3proto);
1326
1327 if (unlikely(ret < 0))
1328 goto nla_put_failure;
1329
1330 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1331 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1332 nf_ct_l4proto_put(l4proto);
1333 if (unlikely(ret < 0))
1334 goto nla_put_failure;
1335
1336 nla_nest_end(skb, nest_parms);
1337
1338 return 0;
1339
1340 nla_put_failure:
1341 return -1;
1342 }
1343
1344 static int
1345 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1346 const struct nf_conntrack_expect *exp)
1347 {
1348 struct nf_conn *master = exp->master;
1349 long timeout = (exp->timeout.expires - jiffies) / HZ;
1350
1351 if (timeout < 0)
1352 timeout = 0;
1353
1354 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1355 goto nla_put_failure;
1356 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1357 goto nla_put_failure;
1358 if (ctnetlink_exp_dump_tuple(skb,
1359 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1360 CTA_EXPECT_MASTER) < 0)
1361 goto nla_put_failure;
1362
1363 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1364 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1365
1366 return 0;
1367
1368 nla_put_failure:
1369 return -1;
1370 }
1371
1372 static int
1373 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1374 int event,
1375 int nowait,
1376 const struct nf_conntrack_expect *exp)
1377 {
1378 struct nlmsghdr *nlh;
1379 struct nfgenmsg *nfmsg;
1380 unsigned char *b = skb_tail_pointer(skb);
1381
1382 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1383 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1384 nfmsg = NLMSG_DATA(nlh);
1385
1386 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1387 nfmsg->nfgen_family = exp->tuple.src.l3num;
1388 nfmsg->version = NFNETLINK_V0;
1389 nfmsg->res_id = 0;
1390
1391 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1392 goto nla_put_failure;
1393
1394 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1395 return skb->len;
1396
1397 nlmsg_failure:
1398 nla_put_failure:
1399 nlmsg_trim(skb, b);
1400 return -1;
1401 }
1402
1403 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1404 static int ctnetlink_expect_event(struct notifier_block *this,
1405 unsigned long events, void *ptr)
1406 {
1407 struct nlmsghdr *nlh;
1408 struct nfgenmsg *nfmsg;
1409 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1410 struct sk_buff *skb;
1411 unsigned int type;
1412 sk_buff_data_t b;
1413 int flags = 0;
1414
1415 if (events & IPEXP_NEW) {
1416 type = IPCTNL_MSG_EXP_NEW;
1417 flags = NLM_F_CREATE|NLM_F_EXCL;
1418 } else
1419 return NOTIFY_DONE;
1420
1421 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1422 return NOTIFY_DONE;
1423
1424 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1425 if (!skb)
1426 return NOTIFY_DONE;
1427
1428 b = skb->tail;
1429
1430 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1431 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1432 nfmsg = NLMSG_DATA(nlh);
1433
1434 nlh->nlmsg_flags = flags;
1435 nfmsg->nfgen_family = exp->tuple.src.l3num;
1436 nfmsg->version = NFNETLINK_V0;
1437 nfmsg->res_id = 0;
1438
1439 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1440 goto nla_put_failure;
1441
1442 nlh->nlmsg_len = skb->tail - b;
1443 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1444 return NOTIFY_DONE;
1445
1446 nlmsg_failure:
1447 nla_put_failure:
1448 kfree_skb(skb);
1449 return NOTIFY_DONE;
1450 }
1451 #endif
1452 static int ctnetlink_exp_done(struct netlink_callback *cb)
1453 {
1454 if (cb->args[1])
1455 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1456 return 0;
1457 }
1458
1459 static int
1460 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1461 {
1462 struct nf_conntrack_expect *exp, *last;
1463 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1464 struct hlist_node *n;
1465 u_int8_t l3proto = nfmsg->nfgen_family;
1466
1467 rcu_read_lock();
1468 last = (struct nf_conntrack_expect *)cb->args[1];
1469 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1470 restart:
1471 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1472 hnode) {
1473 if (l3proto && exp->tuple.src.l3num != l3proto)
1474 continue;
1475 if (cb->args[1]) {
1476 if (exp != last)
1477 continue;
1478 cb->args[1] = 0;
1479 }
1480 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1481 cb->nlh->nlmsg_seq,
1482 IPCTNL_MSG_EXP_NEW,
1483 1, exp) < 0) {
1484 if (!atomic_inc_not_zero(&exp->use))
1485 continue;
1486 cb->args[1] = (unsigned long)exp;
1487 goto out;
1488 }
1489 }
1490 if (cb->args[1]) {
1491 cb->args[1] = 0;
1492 goto restart;
1493 }
1494 }
1495 out:
1496 rcu_read_unlock();
1497 if (last)
1498 nf_ct_expect_put(last);
1499
1500 return skb->len;
1501 }
1502
1503 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1504 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1505 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1506 };
1507
1508 static int
1509 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1510 struct nlmsghdr *nlh, struct nlattr *cda[])
1511 {
1512 struct nf_conntrack_tuple tuple;
1513 struct nf_conntrack_expect *exp;
1514 struct sk_buff *skb2;
1515 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1516 u_int8_t u3 = nfmsg->nfgen_family;
1517 int err = 0;
1518
1519 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1520 return netlink_dump_start(ctnl, skb, nlh,
1521 ctnetlink_exp_dump_table,
1522 ctnetlink_exp_done);
1523 }
1524
1525 if (cda[CTA_EXPECT_MASTER])
1526 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1527 else
1528 return -EINVAL;
1529
1530 if (err < 0)
1531 return err;
1532
1533 exp = nf_ct_expect_find_get(&tuple);
1534 if (!exp)
1535 return -ENOENT;
1536
1537 if (cda[CTA_EXPECT_ID]) {
1538 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1539 if (ntohl(id) != (u32)(unsigned long)exp) {
1540 nf_ct_expect_put(exp);
1541 return -ENOENT;
1542 }
1543 }
1544
1545 err = -ENOMEM;
1546 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1547 if (!skb2)
1548 goto out;
1549
1550 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1551 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1552 1, exp);
1553 if (err <= 0)
1554 goto free;
1555
1556 nf_ct_expect_put(exp);
1557
1558 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1559
1560 free:
1561 kfree_skb(skb2);
1562 out:
1563 nf_ct_expect_put(exp);
1564 return err;
1565 }
1566
1567 static int
1568 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1569 struct nlmsghdr *nlh, struct nlattr *cda[])
1570 {
1571 struct nf_conntrack_expect *exp;
1572 struct nf_conntrack_tuple tuple;
1573 struct nf_conntrack_helper *h;
1574 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1575 struct hlist_node *n, *next;
1576 u_int8_t u3 = nfmsg->nfgen_family;
1577 unsigned int i;
1578 int err;
1579
1580 if (cda[CTA_EXPECT_TUPLE]) {
1581 /* delete a single expect by tuple */
1582 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1583 if (err < 0)
1584 return err;
1585
1586 /* bump usage count to 2 */
1587 exp = nf_ct_expect_find_get(&tuple);
1588 if (!exp)
1589 return -ENOENT;
1590
1591 if (cda[CTA_EXPECT_ID]) {
1592 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1593 if (ntohl(id) != (u32)(unsigned long)exp) {
1594 nf_ct_expect_put(exp);
1595 return -ENOENT;
1596 }
1597 }
1598
1599 /* after list removal, usage count == 1 */
1600 nf_ct_unexpect_related(exp);
1601 /* have to put what we 'get' above.
1602 * after this line usage count == 0 */
1603 nf_ct_expect_put(exp);
1604 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1605 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1606 struct nf_conn_help *m_help;
1607
1608 /* delete all expectations for this helper */
1609 spin_lock_bh(&nf_conntrack_lock);
1610 h = __nf_conntrack_helper_find_byname(name);
1611 if (!h) {
1612 spin_unlock_bh(&nf_conntrack_lock);
1613 return -EINVAL;
1614 }
1615 for (i = 0; i < nf_ct_expect_hsize; i++) {
1616 hlist_for_each_entry_safe(exp, n, next,
1617 &nf_ct_expect_hash[i],
1618 hnode) {
1619 m_help = nfct_help(exp->master);
1620 if (m_help->helper == h
1621 && del_timer(&exp->timeout)) {
1622 nf_ct_unlink_expect(exp);
1623 nf_ct_expect_put(exp);
1624 }
1625 }
1626 }
1627 spin_unlock_bh(&nf_conntrack_lock);
1628 } else {
1629 /* This basically means we have to flush everything*/
1630 spin_lock_bh(&nf_conntrack_lock);
1631 for (i = 0; i < nf_ct_expect_hsize; i++) {
1632 hlist_for_each_entry_safe(exp, n, next,
1633 &nf_ct_expect_hash[i],
1634 hnode) {
1635 if (del_timer(&exp->timeout)) {
1636 nf_ct_unlink_expect(exp);
1637 nf_ct_expect_put(exp);
1638 }
1639 }
1640 }
1641 spin_unlock_bh(&nf_conntrack_lock);
1642 }
1643
1644 return 0;
1645 }
1646 static int
1647 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1648 {
1649 return -EOPNOTSUPP;
1650 }
1651
1652 static int
1653 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1654 {
1655 struct nf_conntrack_tuple tuple, mask, master_tuple;
1656 struct nf_conntrack_tuple_hash *h = NULL;
1657 struct nf_conntrack_expect *exp;
1658 struct nf_conn *ct;
1659 struct nf_conn_help *help;
1660 int err = 0;
1661
1662 /* caller guarantees that those three CTA_EXPECT_* exist */
1663 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1664 if (err < 0)
1665 return err;
1666 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1667 if (err < 0)
1668 return err;
1669 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1670 if (err < 0)
1671 return err;
1672
1673 /* Look for master conntrack of this expectation */
1674 h = nf_conntrack_find_get(&master_tuple);
1675 if (!h)
1676 return -ENOENT;
1677 ct = nf_ct_tuplehash_to_ctrack(h);
1678 help = nfct_help(ct);
1679
1680 if (!help || !help->helper) {
1681 /* such conntrack hasn't got any helper, abort */
1682 err = -EINVAL;
1683 goto out;
1684 }
1685
1686 exp = nf_ct_expect_alloc(ct);
1687 if (!exp) {
1688 err = -ENOMEM;
1689 goto out;
1690 }
1691
1692 exp->expectfn = NULL;
1693 exp->flags = 0;
1694 exp->master = ct;
1695 exp->helper = NULL;
1696 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1697 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1698 exp->mask.src.u.all = mask.src.u.all;
1699
1700 err = nf_ct_expect_related(exp);
1701 nf_ct_expect_put(exp);
1702
1703 out:
1704 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1705 return err;
1706 }
1707
1708 static int
1709 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1710 struct nlmsghdr *nlh, struct nlattr *cda[])
1711 {
1712 struct nf_conntrack_tuple tuple;
1713 struct nf_conntrack_expect *exp;
1714 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1715 u_int8_t u3 = nfmsg->nfgen_family;
1716 int err = 0;
1717
1718 if (!cda[CTA_EXPECT_TUPLE]
1719 || !cda[CTA_EXPECT_MASK]
1720 || !cda[CTA_EXPECT_MASTER])
1721 return -EINVAL;
1722
1723 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1724 if (err < 0)
1725 return err;
1726
1727 spin_lock_bh(&nf_conntrack_lock);
1728 exp = __nf_ct_expect_find(&tuple);
1729
1730 if (!exp) {
1731 spin_unlock_bh(&nf_conntrack_lock);
1732 err = -ENOENT;
1733 if (nlh->nlmsg_flags & NLM_F_CREATE)
1734 err = ctnetlink_create_expect(cda, u3);
1735 return err;
1736 }
1737
1738 err = -EEXIST;
1739 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1740 err = ctnetlink_change_expect(exp, cda);
1741 spin_unlock_bh(&nf_conntrack_lock);
1742
1743 return err;
1744 }
1745
1746 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1747 static struct notifier_block ctnl_notifier = {
1748 .notifier_call = ctnetlink_conntrack_event,
1749 };
1750
1751 static struct notifier_block ctnl_notifier_exp = {
1752 .notifier_call = ctnetlink_expect_event,
1753 };
1754 #endif
1755
1756 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1757 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1758 .attr_count = CTA_MAX,
1759 .policy = ct_nla_policy },
1760 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1761 .attr_count = CTA_MAX,
1762 .policy = ct_nla_policy },
1763 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1764 .attr_count = CTA_MAX,
1765 .policy = ct_nla_policy },
1766 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1767 .attr_count = CTA_MAX,
1768 .policy = ct_nla_policy },
1769 };
1770
1771 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1772 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1773 .attr_count = CTA_EXPECT_MAX,
1774 .policy = exp_nla_policy },
1775 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1776 .attr_count = CTA_EXPECT_MAX,
1777 .policy = exp_nla_policy },
1778 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1779 .attr_count = CTA_EXPECT_MAX,
1780 .policy = exp_nla_policy },
1781 };
1782
1783 static const struct nfnetlink_subsystem ctnl_subsys = {
1784 .name = "conntrack",
1785 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1786 .cb_count = IPCTNL_MSG_MAX,
1787 .cb = ctnl_cb,
1788 };
1789
1790 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1791 .name = "conntrack_expect",
1792 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1793 .cb_count = IPCTNL_MSG_EXP_MAX,
1794 .cb = ctnl_exp_cb,
1795 };
1796
1797 MODULE_ALIAS("ip_conntrack_netlink");
1798 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1799 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1800
1801 static int __init ctnetlink_init(void)
1802 {
1803 int ret;
1804
1805 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1806 ret = nfnetlink_subsys_register(&ctnl_subsys);
1807 if (ret < 0) {
1808 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1809 goto err_out;
1810 }
1811
1812 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1813 if (ret < 0) {
1814 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1815 goto err_unreg_subsys;
1816 }
1817
1818 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1819 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1820 if (ret < 0) {
1821 printk("ctnetlink_init: cannot register notifier.\n");
1822 goto err_unreg_exp_subsys;
1823 }
1824
1825 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1826 if (ret < 0) {
1827 printk("ctnetlink_init: cannot expect register notifier.\n");
1828 goto err_unreg_notifier;
1829 }
1830 #endif
1831
1832 return 0;
1833
1834 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1835 err_unreg_notifier:
1836 nf_conntrack_unregister_notifier(&ctnl_notifier);
1837 err_unreg_exp_subsys:
1838 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1839 #endif
1840 err_unreg_subsys:
1841 nfnetlink_subsys_unregister(&ctnl_subsys);
1842 err_out:
1843 return ret;
1844 }
1845
1846 static void __exit ctnetlink_exit(void)
1847 {
1848 printk("ctnetlink: unregistering from nfnetlink.\n");
1849
1850 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1851 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1852 nf_conntrack_unregister_notifier(&ctnl_notifier);
1853 #endif
1854
1855 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1856 nfnetlink_subsys_unregister(&ctnl_subsys);
1857 return;
1858 }
1859
1860 module_init(ctnetlink_init);
1861 module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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