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[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_MARK
495 if ((events & IPCT_MARK || ct->mark)
496 && ctnetlink_dump_mark(skb, ct) < 0)
497 goto nla_put_failure;
498 #endif
499 #ifdef CONFIG_NF_CONNTRACK_SECMARK
500 if ((events & IPCT_SECMARK || ct->secmark)
501 && ctnetlink_dump_secmark(skb, ct) < 0)
502 goto nla_put_failure;
503 #endif
504
505 if (events & IPCT_COUNTER_FILLING &&
506 (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
507 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
508 goto nla_put_failure;
509
510 if (events & IPCT_RELATED &&
511 ctnetlink_dump_master(skb, ct) < 0)
512 goto nla_put_failure;
513
514 if (events & IPCT_NATSEQADJ &&
515 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
516 goto nla_put_failure;
517 }
518
519 nlh->nlmsg_len = skb->tail - b;
520 nfnetlink_send(skb, 0, group, 0);
521 return NOTIFY_DONE;
522
523 nlmsg_failure:
524 nla_put_failure:
525 kfree_skb(skb);
526 return NOTIFY_DONE;
527 }
528 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
529
530 static int ctnetlink_done(struct netlink_callback *cb)
531 {
532 if (cb->args[1])
533 nf_ct_put((struct nf_conn *)cb->args[1]);
534 return 0;
535 }
536
537 #define L3PROTO(ct) (ct)->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
538
539 static int
540 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
541 {
542 struct nf_conn *ct, *last;
543 struct nf_conntrack_tuple_hash *h;
544 struct hlist_node *n;
545 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
546 u_int8_t l3proto = nfmsg->nfgen_family;
547
548 rcu_read_lock();
549 last = (struct nf_conn *)cb->args[1];
550 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
551 restart:
552 hlist_for_each_entry_rcu(h, n, &nf_conntrack_hash[cb->args[0]],
553 hnode) {
554 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
555 continue;
556 ct = nf_ct_tuplehash_to_ctrack(h);
557 /* Dump entries of a given L3 protocol number.
558 * If it is not specified, ie. l3proto == 0,
559 * then dump everything. */
560 if (l3proto && L3PROTO(ct) != l3proto)
561 continue;
562 if (cb->args[1]) {
563 if (ct != last)
564 continue;
565 cb->args[1] = 0;
566 }
567 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
568 cb->nlh->nlmsg_seq,
569 IPCTNL_MSG_CT_NEW,
570 1, ct) < 0) {
571 if (!atomic_inc_not_zero(&ct->ct_general.use))
572 continue;
573 cb->args[1] = (unsigned long)ct;
574 goto out;
575 }
576 #ifdef CONFIG_NF_CT_ACCT
577 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
578 IPCTNL_MSG_CT_GET_CTRZERO)
579 memset(&ct->counters, 0, sizeof(ct->counters));
580 #endif
581 }
582 if (cb->args[1]) {
583 cb->args[1] = 0;
584 goto restart;
585 }
586 }
587 out:
588 rcu_read_unlock();
589 if (last)
590 nf_ct_put(last);
591
592 return skb->len;
593 }
594
595 static inline int
596 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
597 {
598 struct nlattr *tb[CTA_IP_MAX+1];
599 struct nf_conntrack_l3proto *l3proto;
600 int ret = 0;
601
602 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
603
604 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
605
606 if (likely(l3proto->nlattr_to_tuple)) {
607 ret = nla_validate_nested(attr, CTA_IP_MAX,
608 l3proto->nla_policy);
609 if (ret == 0)
610 ret = l3proto->nlattr_to_tuple(tb, tuple);
611 }
612
613 nf_ct_l3proto_put(l3proto);
614
615 return ret;
616 }
617
618 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
619 [CTA_PROTO_NUM] = { .type = NLA_U8 },
620 };
621
622 static inline int
623 ctnetlink_parse_tuple_proto(struct nlattr *attr,
624 struct nf_conntrack_tuple *tuple)
625 {
626 struct nlattr *tb[CTA_PROTO_MAX+1];
627 struct nf_conntrack_l4proto *l4proto;
628 int ret = 0;
629
630 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
631 if (ret < 0)
632 return ret;
633
634 if (!tb[CTA_PROTO_NUM])
635 return -EINVAL;
636 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
637
638 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
639
640 if (likely(l4proto->nlattr_to_tuple)) {
641 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
642 l4proto->nla_policy);
643 if (ret == 0)
644 ret = l4proto->nlattr_to_tuple(tb, tuple);
645 }
646
647 nf_ct_l4proto_put(l4proto);
648
649 return ret;
650 }
651
652 static int
653 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
654 enum ctattr_tuple type, u_int8_t l3num)
655 {
656 struct nlattr *tb[CTA_TUPLE_MAX+1];
657 int err;
658
659 memset(tuple, 0, sizeof(*tuple));
660
661 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
662
663 if (!tb[CTA_TUPLE_IP])
664 return -EINVAL;
665
666 tuple->src.l3num = l3num;
667
668 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
669 if (err < 0)
670 return err;
671
672 if (!tb[CTA_TUPLE_PROTO])
673 return -EINVAL;
674
675 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
676 if (err < 0)
677 return err;
678
679 /* orig and expect tuples get DIR_ORIGINAL */
680 if (type == CTA_TUPLE_REPLY)
681 tuple->dst.dir = IP_CT_DIR_REPLY;
682 else
683 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
684
685 return 0;
686 }
687
688 #ifdef CONFIG_NF_NAT_NEEDED
689 static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
690 [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 },
691 [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 },
692 };
693
694 static int nfnetlink_parse_nat_proto(struct nlattr *attr,
695 const struct nf_conn *ct,
696 struct nf_nat_range *range)
697 {
698 struct nlattr *tb[CTA_PROTONAT_MAX+1];
699 const struct nf_nat_protocol *npt;
700 int err;
701
702 err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
703 if (err < 0)
704 return err;
705
706 npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
707
708 if (!npt->nlattr_to_range) {
709 nf_nat_proto_put(npt);
710 return 0;
711 }
712
713 /* nlattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
714 if (npt->nlattr_to_range(tb, range) > 0)
715 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
716
717 nf_nat_proto_put(npt);
718
719 return 0;
720 }
721
722 static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
723 [CTA_NAT_MINIP] = { .type = NLA_U32 },
724 [CTA_NAT_MAXIP] = { .type = NLA_U32 },
725 };
726
727 static inline int
728 nfnetlink_parse_nat(struct nlattr *nat,
729 const struct nf_conn *ct, struct nf_nat_range *range)
730 {
731 struct nlattr *tb[CTA_NAT_MAX+1];
732 int err;
733
734 memset(range, 0, sizeof(*range));
735
736 err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
737 if (err < 0)
738 return err;
739
740 if (tb[CTA_NAT_MINIP])
741 range->min_ip = nla_get_be32(tb[CTA_NAT_MINIP]);
742
743 if (!tb[CTA_NAT_MAXIP])
744 range->max_ip = range->min_ip;
745 else
746 range->max_ip = nla_get_be32(tb[CTA_NAT_MAXIP]);
747
748 if (range->min_ip)
749 range->flags |= IP_NAT_RANGE_MAP_IPS;
750
751 if (!tb[CTA_NAT_PROTO])
752 return 0;
753
754 err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
755 if (err < 0)
756 return err;
757
758 return 0;
759 }
760 #endif
761
762 static inline int
763 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
764 {
765 struct nlattr *tb[CTA_HELP_MAX+1];
766
767 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
768
769 if (!tb[CTA_HELP_NAME])
770 return -EINVAL;
771
772 *helper_name = nla_data(tb[CTA_HELP_NAME]);
773
774 return 0;
775 }
776
777 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
778 [CTA_STATUS] = { .type = NLA_U32 },
779 [CTA_TIMEOUT] = { .type = NLA_U32 },
780 [CTA_MARK] = { .type = NLA_U32 },
781 [CTA_USE] = { .type = NLA_U32 },
782 [CTA_ID] = { .type = NLA_U32 },
783 };
784
785 static int
786 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
787 struct nlmsghdr *nlh, struct nlattr *cda[])
788 {
789 struct nf_conntrack_tuple_hash *h;
790 struct nf_conntrack_tuple tuple;
791 struct nf_conn *ct;
792 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
793 u_int8_t u3 = nfmsg->nfgen_family;
794 int err = 0;
795
796 if (cda[CTA_TUPLE_ORIG])
797 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
798 else if (cda[CTA_TUPLE_REPLY])
799 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
800 else {
801 /* Flush the whole table */
802 nf_conntrack_flush();
803 return 0;
804 }
805
806 if (err < 0)
807 return err;
808
809 h = nf_conntrack_find_get(&tuple);
810 if (!h)
811 return -ENOENT;
812
813 ct = nf_ct_tuplehash_to_ctrack(h);
814
815 if (cda[CTA_ID]) {
816 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
817 if (id != (u32)(unsigned long)ct) {
818 nf_ct_put(ct);
819 return -ENOENT;
820 }
821 }
822 if (del_timer(&ct->timeout))
823 ct->timeout.function((unsigned long)ct);
824
825 nf_ct_put(ct);
826
827 return 0;
828 }
829
830 static int
831 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
832 struct nlmsghdr *nlh, struct nlattr *cda[])
833 {
834 struct nf_conntrack_tuple_hash *h;
835 struct nf_conntrack_tuple tuple;
836 struct nf_conn *ct;
837 struct sk_buff *skb2 = NULL;
838 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
839 u_int8_t u3 = nfmsg->nfgen_family;
840 int err = 0;
841
842 if (nlh->nlmsg_flags & NLM_F_DUMP) {
843 #ifndef CONFIG_NF_CT_ACCT
844 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
845 return -ENOTSUPP;
846 #endif
847 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
848 ctnetlink_done);
849 }
850
851 if (cda[CTA_TUPLE_ORIG])
852 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
853 else if (cda[CTA_TUPLE_REPLY])
854 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
855 else
856 return -EINVAL;
857
858 if (err < 0)
859 return err;
860
861 h = nf_conntrack_find_get(&tuple);
862 if (!h)
863 return -ENOENT;
864
865 ct = nf_ct_tuplehash_to_ctrack(h);
866
867 err = -ENOMEM;
868 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
869 if (!skb2) {
870 nf_ct_put(ct);
871 return -ENOMEM;
872 }
873
874 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
875 IPCTNL_MSG_CT_NEW, 1, ct);
876 nf_ct_put(ct);
877 if (err <= 0)
878 goto free;
879
880 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
881 if (err < 0)
882 goto out;
883
884 return 0;
885
886 free:
887 kfree_skb(skb2);
888 out:
889 return err;
890 }
891
892 static int
893 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
894 {
895 unsigned long d;
896 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
897 d = ct->status ^ status;
898
899 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
900 /* unchangeable */
901 return -EINVAL;
902
903 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
904 /* SEEN_REPLY bit can only be set */
905 return -EINVAL;
906
907
908 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
909 /* ASSURED bit can only be set */
910 return -EINVAL;
911
912 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
913 #ifndef CONFIG_NF_NAT_NEEDED
914 return -EINVAL;
915 #else
916 struct nf_nat_range range;
917
918 if (cda[CTA_NAT_DST]) {
919 if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
920 &range) < 0)
921 return -EINVAL;
922 if (nf_nat_initialized(ct, IP_NAT_MANIP_DST))
923 return -EEXIST;
924 nf_nat_setup_info(ct, &range, IP_NAT_MANIP_DST);
925 }
926 if (cda[CTA_NAT_SRC]) {
927 if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
928 &range) < 0)
929 return -EINVAL;
930 if (nf_nat_initialized(ct, IP_NAT_MANIP_SRC))
931 return -EEXIST;
932 nf_nat_setup_info(ct, &range, IP_NAT_MANIP_SRC);
933 }
934 #endif
935 }
936
937 /* Be careful here, modifying NAT bits can screw up things,
938 * so don't let users modify them directly if they don't pass
939 * nf_nat_range. */
940 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
941 return 0;
942 }
943
944
945 static inline int
946 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
947 {
948 struct nf_conntrack_helper *helper;
949 struct nf_conn_help *help = nfct_help(ct);
950 char *helpname;
951 int err;
952
953 /* don't change helper of sibling connections */
954 if (ct->master)
955 return -EINVAL;
956
957 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
958 if (err < 0)
959 return err;
960
961 if (!strcmp(helpname, "")) {
962 if (help && help->helper) {
963 /* we had a helper before ... */
964 nf_ct_remove_expectations(ct);
965 rcu_assign_pointer(help->helper, NULL);
966 }
967
968 return 0;
969 }
970
971 helper = __nf_conntrack_helper_find_byname(helpname);
972 if (helper == NULL)
973 return -EINVAL;
974
975 if (help) {
976 if (help->helper == helper)
977 return 0;
978 if (help->helper)
979 return -EBUSY;
980 /* need to zero data of old helper */
981 memset(&help->help, 0, sizeof(help->help));
982 } else {
983 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
984 if (help == NULL)
985 return -ENOMEM;
986 }
987
988 rcu_assign_pointer(help->helper, helper);
989
990 return 0;
991 }
992
993 static inline int
994 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
995 {
996 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
997
998 if (!del_timer(&ct->timeout))
999 return -ETIME;
1000
1001 ct->timeout.expires = jiffies + timeout * HZ;
1002 add_timer(&ct->timeout);
1003
1004 return 0;
1005 }
1006
1007 static inline int
1008 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1009 {
1010 struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1011 struct nf_conntrack_l4proto *l4proto;
1012 u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
1013 u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
1014 int err = 0;
1015
1016 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1017
1018 l4proto = nf_ct_l4proto_find_get(l3num, npt);
1019
1020 if (l4proto->from_nlattr)
1021 err = l4proto->from_nlattr(tb, ct);
1022 nf_ct_l4proto_put(l4proto);
1023
1024 return err;
1025 }
1026
1027 #ifdef CONFIG_NF_NAT_NEEDED
1028 static inline int
1029 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1030 {
1031 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1032
1033 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1034
1035 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1036 return -EINVAL;
1037
1038 natseq->correction_pos =
1039 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1040
1041 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1042 return -EINVAL;
1043
1044 natseq->offset_before =
1045 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1046
1047 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1048 return -EINVAL;
1049
1050 natseq->offset_after =
1051 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1052
1053 return 0;
1054 }
1055
1056 static int
1057 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1058 {
1059 int ret = 0;
1060 struct nf_conn_nat *nat = nfct_nat(ct);
1061
1062 if (!nat)
1063 return 0;
1064
1065 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1066 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1067 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1068 if (ret < 0)
1069 return ret;
1070
1071 ct->status |= IPS_SEQ_ADJUST;
1072 }
1073
1074 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1075 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1076 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1077 if (ret < 0)
1078 return ret;
1079
1080 ct->status |= IPS_SEQ_ADJUST;
1081 }
1082
1083 return 0;
1084 }
1085 #endif
1086
1087 static int
1088 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1089 {
1090 int err;
1091
1092 if (cda[CTA_HELP]) {
1093 err = ctnetlink_change_helper(ct, cda);
1094 if (err < 0)
1095 return err;
1096 }
1097
1098 if (cda[CTA_TIMEOUT]) {
1099 err = ctnetlink_change_timeout(ct, cda);
1100 if (err < 0)
1101 return err;
1102 }
1103
1104 if (cda[CTA_STATUS]) {
1105 err = ctnetlink_change_status(ct, cda);
1106 if (err < 0)
1107 return err;
1108 }
1109
1110 if (cda[CTA_PROTOINFO]) {
1111 err = ctnetlink_change_protoinfo(ct, cda);
1112 if (err < 0)
1113 return err;
1114 }
1115
1116 #if defined(CONFIG_NF_CONNTRACK_MARK)
1117 if (cda[CTA_MARK])
1118 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1119 #endif
1120
1121 #ifdef CONFIG_NF_NAT_NEEDED
1122 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1123 err = ctnetlink_change_nat_seq_adj(ct, cda);
1124 if (err < 0)
1125 return err;
1126 }
1127 #endif
1128
1129 return 0;
1130 }
1131
1132 static int
1133 ctnetlink_create_conntrack(struct nlattr *cda[],
1134 struct nf_conntrack_tuple *otuple,
1135 struct nf_conntrack_tuple *rtuple,
1136 struct nf_conn *master_ct)
1137 {
1138 struct nf_conn *ct;
1139 int err = -EINVAL;
1140 struct nf_conn_help *help;
1141 struct nf_conntrack_helper *helper;
1142
1143 ct = nf_conntrack_alloc(otuple, rtuple);
1144 if (ct == NULL || IS_ERR(ct))
1145 return -ENOMEM;
1146
1147 if (!cda[CTA_TIMEOUT])
1148 goto err;
1149 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1150
1151 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1152 ct->status |= IPS_CONFIRMED;
1153
1154 if (cda[CTA_STATUS]) {
1155 err = ctnetlink_change_status(ct, cda);
1156 if (err < 0)
1157 goto err;
1158 }
1159
1160 if (cda[CTA_PROTOINFO]) {
1161 err = ctnetlink_change_protoinfo(ct, cda);
1162 if (err < 0)
1163 goto err;
1164 }
1165
1166 #if defined(CONFIG_NF_CONNTRACK_MARK)
1167 if (cda[CTA_MARK])
1168 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1169 #endif
1170
1171 rcu_read_lock();
1172 helper = __nf_ct_helper_find(rtuple);
1173 if (helper) {
1174 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
1175 if (help == NULL) {
1176 rcu_read_unlock();
1177 err = -ENOMEM;
1178 goto err;
1179 }
1180 /* not in hash table yet so not strictly necessary */
1181 rcu_assign_pointer(help->helper, helper);
1182 }
1183
1184 /* setup master conntrack: this is a confirmed expectation */
1185 if (master_ct) {
1186 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1187 ct->master = master_ct;
1188 }
1189
1190 add_timer(&ct->timeout);
1191 nf_conntrack_hash_insert(ct);
1192 rcu_read_unlock();
1193
1194 return 0;
1195
1196 err:
1197 nf_conntrack_free(ct);
1198 return err;
1199 }
1200
1201 static int
1202 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1203 struct nlmsghdr *nlh, struct nlattr *cda[])
1204 {
1205 struct nf_conntrack_tuple otuple, rtuple;
1206 struct nf_conntrack_tuple_hash *h = NULL;
1207 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1208 u_int8_t u3 = nfmsg->nfgen_family;
1209 int err = 0;
1210
1211 if (cda[CTA_TUPLE_ORIG]) {
1212 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1213 if (err < 0)
1214 return err;
1215 }
1216
1217 if (cda[CTA_TUPLE_REPLY]) {
1218 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1219 if (err < 0)
1220 return err;
1221 }
1222
1223 write_lock_bh(&nf_conntrack_lock);
1224 if (cda[CTA_TUPLE_ORIG])
1225 h = __nf_conntrack_find(&otuple, NULL);
1226 else if (cda[CTA_TUPLE_REPLY])
1227 h = __nf_conntrack_find(&rtuple, NULL);
1228
1229 if (h == NULL) {
1230 struct nf_conntrack_tuple master;
1231 struct nf_conntrack_tuple_hash *master_h = NULL;
1232 struct nf_conn *master_ct = NULL;
1233
1234 if (cda[CTA_TUPLE_MASTER]) {
1235 err = ctnetlink_parse_tuple(cda,
1236 &master,
1237 CTA_TUPLE_MASTER,
1238 u3);
1239 if (err < 0)
1240 goto out_unlock;
1241
1242 master_h = __nf_conntrack_find(&master, NULL);
1243 if (master_h == NULL) {
1244 err = -ENOENT;
1245 goto out_unlock;
1246 }
1247 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1248 atomic_inc(&master_ct->ct_general.use);
1249 }
1250
1251 write_unlock_bh(&nf_conntrack_lock);
1252 err = -ENOENT;
1253 if (nlh->nlmsg_flags & NLM_F_CREATE)
1254 err = ctnetlink_create_conntrack(cda,
1255 &otuple,
1256 &rtuple,
1257 master_ct);
1258 if (err < 0 && master_ct)
1259 nf_ct_put(master_ct);
1260
1261 return err;
1262 }
1263 /* implicit 'else' */
1264
1265 /* We manipulate the conntrack inside the global conntrack table lock,
1266 * so there's no need to increase the refcount */
1267 err = -EEXIST;
1268 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1269 /* we only allow nat config for new conntracks */
1270 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1271 err = -EINVAL;
1272 goto out_unlock;
1273 }
1274 /* can't link an existing conntrack to a master */
1275 if (cda[CTA_TUPLE_MASTER]) {
1276 err = -EINVAL;
1277 goto out_unlock;
1278 }
1279 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1280 cda);
1281 }
1282
1283 out_unlock:
1284 write_unlock_bh(&nf_conntrack_lock);
1285 return err;
1286 }
1287
1288 /***********************************************************************
1289 * EXPECT
1290 ***********************************************************************/
1291
1292 static inline int
1293 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1294 const struct nf_conntrack_tuple *tuple,
1295 enum ctattr_expect type)
1296 {
1297 struct nlattr *nest_parms;
1298
1299 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1300 if (!nest_parms)
1301 goto nla_put_failure;
1302 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1303 goto nla_put_failure;
1304 nla_nest_end(skb, nest_parms);
1305
1306 return 0;
1307
1308 nla_put_failure:
1309 return -1;
1310 }
1311
1312 static inline int
1313 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1314 const struct nf_conntrack_tuple *tuple,
1315 const struct nf_conntrack_tuple_mask *mask)
1316 {
1317 int ret;
1318 struct nf_conntrack_l3proto *l3proto;
1319 struct nf_conntrack_l4proto *l4proto;
1320 struct nf_conntrack_tuple m;
1321 struct nlattr *nest_parms;
1322
1323 memset(&m, 0xFF, sizeof(m));
1324 m.src.u.all = mask->src.u.all;
1325 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1326
1327 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1328 if (!nest_parms)
1329 goto nla_put_failure;
1330
1331 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1332 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1333 nf_ct_l3proto_put(l3proto);
1334
1335 if (unlikely(ret < 0))
1336 goto nla_put_failure;
1337
1338 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1339 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1340 nf_ct_l4proto_put(l4proto);
1341 if (unlikely(ret < 0))
1342 goto nla_put_failure;
1343
1344 nla_nest_end(skb, nest_parms);
1345
1346 return 0;
1347
1348 nla_put_failure:
1349 return -1;
1350 }
1351
1352 static int
1353 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1354 const struct nf_conntrack_expect *exp)
1355 {
1356 struct nf_conn *master = exp->master;
1357 long timeout = (exp->timeout.expires - jiffies) / HZ;
1358
1359 if (timeout < 0)
1360 timeout = 0;
1361
1362 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1363 goto nla_put_failure;
1364 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1365 goto nla_put_failure;
1366 if (ctnetlink_exp_dump_tuple(skb,
1367 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1368 CTA_EXPECT_MASTER) < 0)
1369 goto nla_put_failure;
1370
1371 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1372 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1373
1374 return 0;
1375
1376 nla_put_failure:
1377 return -1;
1378 }
1379
1380 static int
1381 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1382 int event,
1383 int nowait,
1384 const struct nf_conntrack_expect *exp)
1385 {
1386 struct nlmsghdr *nlh;
1387 struct nfgenmsg *nfmsg;
1388 unsigned char *b = skb_tail_pointer(skb);
1389
1390 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1391 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1392 nfmsg = NLMSG_DATA(nlh);
1393
1394 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1395 nfmsg->nfgen_family = exp->tuple.src.l3num;
1396 nfmsg->version = NFNETLINK_V0;
1397 nfmsg->res_id = 0;
1398
1399 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1400 goto nla_put_failure;
1401
1402 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1403 return skb->len;
1404
1405 nlmsg_failure:
1406 nla_put_failure:
1407 nlmsg_trim(skb, b);
1408 return -1;
1409 }
1410
1411 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1412 static int ctnetlink_expect_event(struct notifier_block *this,
1413 unsigned long events, void *ptr)
1414 {
1415 struct nlmsghdr *nlh;
1416 struct nfgenmsg *nfmsg;
1417 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1418 struct sk_buff *skb;
1419 unsigned int type;
1420 sk_buff_data_t b;
1421 int flags = 0;
1422
1423 if (events & IPEXP_NEW) {
1424 type = IPCTNL_MSG_EXP_NEW;
1425 flags = NLM_F_CREATE|NLM_F_EXCL;
1426 } else
1427 return NOTIFY_DONE;
1428
1429 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1430 return NOTIFY_DONE;
1431
1432 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1433 if (!skb)
1434 return NOTIFY_DONE;
1435
1436 b = skb->tail;
1437
1438 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1439 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1440 nfmsg = NLMSG_DATA(nlh);
1441
1442 nlh->nlmsg_flags = flags;
1443 nfmsg->nfgen_family = exp->tuple.src.l3num;
1444 nfmsg->version = NFNETLINK_V0;
1445 nfmsg->res_id = 0;
1446
1447 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1448 goto nla_put_failure;
1449
1450 nlh->nlmsg_len = skb->tail - b;
1451 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1452 return NOTIFY_DONE;
1453
1454 nlmsg_failure:
1455 nla_put_failure:
1456 kfree_skb(skb);
1457 return NOTIFY_DONE;
1458 }
1459 #endif
1460 static int ctnetlink_exp_done(struct netlink_callback *cb)
1461 {
1462 if (cb->args[1])
1463 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1464 return 0;
1465 }
1466
1467 static int
1468 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1469 {
1470 struct nf_conntrack_expect *exp, *last;
1471 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1472 struct hlist_node *n;
1473 u_int8_t l3proto = nfmsg->nfgen_family;
1474
1475 rcu_read_lock();
1476 last = (struct nf_conntrack_expect *)cb->args[1];
1477 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1478 restart:
1479 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1480 hnode) {
1481 if (l3proto && exp->tuple.src.l3num != l3proto)
1482 continue;
1483 if (cb->args[1]) {
1484 if (exp != last)
1485 continue;
1486 cb->args[1] = 0;
1487 }
1488 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1489 cb->nlh->nlmsg_seq,
1490 IPCTNL_MSG_EXP_NEW,
1491 1, exp) < 0) {
1492 if (!atomic_inc_not_zero(&exp->use))
1493 continue;
1494 cb->args[1] = (unsigned long)exp;
1495 goto out;
1496 }
1497 }
1498 if (cb->args[1]) {
1499 cb->args[1] = 0;
1500 goto restart;
1501 }
1502 }
1503 out:
1504 rcu_read_unlock();
1505 if (last)
1506 nf_ct_expect_put(last);
1507
1508 return skb->len;
1509 }
1510
1511 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1512 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1513 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1514 };
1515
1516 static int
1517 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1518 struct nlmsghdr *nlh, struct nlattr *cda[])
1519 {
1520 struct nf_conntrack_tuple tuple;
1521 struct nf_conntrack_expect *exp;
1522 struct sk_buff *skb2;
1523 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1524 u_int8_t u3 = nfmsg->nfgen_family;
1525 int err = 0;
1526
1527 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1528 return netlink_dump_start(ctnl, skb, nlh,
1529 ctnetlink_exp_dump_table,
1530 ctnetlink_exp_done);
1531 }
1532
1533 if (cda[CTA_EXPECT_MASTER])
1534 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1535 else
1536 return -EINVAL;
1537
1538 if (err < 0)
1539 return err;
1540
1541 exp = nf_ct_expect_find_get(&tuple);
1542 if (!exp)
1543 return -ENOENT;
1544
1545 if (cda[CTA_EXPECT_ID]) {
1546 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1547 if (ntohl(id) != (u32)(unsigned long)exp) {
1548 nf_ct_expect_put(exp);
1549 return -ENOENT;
1550 }
1551 }
1552
1553 err = -ENOMEM;
1554 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1555 if (!skb2)
1556 goto out;
1557
1558 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1559 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1560 1, exp);
1561 if (err <= 0)
1562 goto free;
1563
1564 nf_ct_expect_put(exp);
1565
1566 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1567
1568 free:
1569 kfree_skb(skb2);
1570 out:
1571 nf_ct_expect_put(exp);
1572 return err;
1573 }
1574
1575 static int
1576 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1577 struct nlmsghdr *nlh, struct nlattr *cda[])
1578 {
1579 struct nf_conntrack_expect *exp;
1580 struct nf_conntrack_tuple tuple;
1581 struct nf_conntrack_helper *h;
1582 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1583 struct hlist_node *n, *next;
1584 u_int8_t u3 = nfmsg->nfgen_family;
1585 unsigned int i;
1586 int err;
1587
1588 if (cda[CTA_EXPECT_TUPLE]) {
1589 /* delete a single expect by tuple */
1590 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1591 if (err < 0)
1592 return err;
1593
1594 /* bump usage count to 2 */
1595 exp = nf_ct_expect_find_get(&tuple);
1596 if (!exp)
1597 return -ENOENT;
1598
1599 if (cda[CTA_EXPECT_ID]) {
1600 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1601 if (ntohl(id) != (u32)(unsigned long)exp) {
1602 nf_ct_expect_put(exp);
1603 return -ENOENT;
1604 }
1605 }
1606
1607 /* after list removal, usage count == 1 */
1608 nf_ct_unexpect_related(exp);
1609 /* have to put what we 'get' above.
1610 * after this line usage count == 0 */
1611 nf_ct_expect_put(exp);
1612 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1613 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1614 struct nf_conn_help *m_help;
1615
1616 /* delete all expectations for this helper */
1617 write_lock_bh(&nf_conntrack_lock);
1618 h = __nf_conntrack_helper_find_byname(name);
1619 if (!h) {
1620 write_unlock_bh(&nf_conntrack_lock);
1621 return -EINVAL;
1622 }
1623 for (i = 0; i < nf_ct_expect_hsize; i++) {
1624 hlist_for_each_entry_safe(exp, n, next,
1625 &nf_ct_expect_hash[i],
1626 hnode) {
1627 m_help = nfct_help(exp->master);
1628 if (m_help->helper == h
1629 && del_timer(&exp->timeout)) {
1630 nf_ct_unlink_expect(exp);
1631 nf_ct_expect_put(exp);
1632 }
1633 }
1634 }
1635 write_unlock_bh(&nf_conntrack_lock);
1636 } else {
1637 /* This basically means we have to flush everything*/
1638 write_lock_bh(&nf_conntrack_lock);
1639 for (i = 0; i < nf_ct_expect_hsize; i++) {
1640 hlist_for_each_entry_safe(exp, n, next,
1641 &nf_ct_expect_hash[i],
1642 hnode) {
1643 if (del_timer(&exp->timeout)) {
1644 nf_ct_unlink_expect(exp);
1645 nf_ct_expect_put(exp);
1646 }
1647 }
1648 }
1649 write_unlock_bh(&nf_conntrack_lock);
1650 }
1651
1652 return 0;
1653 }
1654 static int
1655 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1656 {
1657 return -EOPNOTSUPP;
1658 }
1659
1660 static int
1661 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1662 {
1663 struct nf_conntrack_tuple tuple, mask, master_tuple;
1664 struct nf_conntrack_tuple_hash *h = NULL;
1665 struct nf_conntrack_expect *exp;
1666 struct nf_conn *ct;
1667 struct nf_conn_help *help;
1668 int err = 0;
1669
1670 /* caller guarantees that those three CTA_EXPECT_* exist */
1671 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1672 if (err < 0)
1673 return err;
1674 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1675 if (err < 0)
1676 return err;
1677 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1678 if (err < 0)
1679 return err;
1680
1681 /* Look for master conntrack of this expectation */
1682 h = nf_conntrack_find_get(&master_tuple);
1683 if (!h)
1684 return -ENOENT;
1685 ct = nf_ct_tuplehash_to_ctrack(h);
1686 help = nfct_help(ct);
1687
1688 if (!help || !help->helper) {
1689 /* such conntrack hasn't got any helper, abort */
1690 err = -EINVAL;
1691 goto out;
1692 }
1693
1694 exp = nf_ct_expect_alloc(ct);
1695 if (!exp) {
1696 err = -ENOMEM;
1697 goto out;
1698 }
1699
1700 exp->expectfn = NULL;
1701 exp->flags = 0;
1702 exp->master = ct;
1703 exp->helper = NULL;
1704 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1705 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1706 exp->mask.src.u.all = mask.src.u.all;
1707
1708 err = nf_ct_expect_related(exp);
1709 nf_ct_expect_put(exp);
1710
1711 out:
1712 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1713 return err;
1714 }
1715
1716 static int
1717 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1718 struct nlmsghdr *nlh, struct nlattr *cda[])
1719 {
1720 struct nf_conntrack_tuple tuple;
1721 struct nf_conntrack_expect *exp;
1722 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1723 u_int8_t u3 = nfmsg->nfgen_family;
1724 int err = 0;
1725
1726 if (!cda[CTA_EXPECT_TUPLE]
1727 || !cda[CTA_EXPECT_MASK]
1728 || !cda[CTA_EXPECT_MASTER])
1729 return -EINVAL;
1730
1731 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1732 if (err < 0)
1733 return err;
1734
1735 write_lock_bh(&nf_conntrack_lock);
1736 exp = __nf_ct_expect_find(&tuple);
1737
1738 if (!exp) {
1739 write_unlock_bh(&nf_conntrack_lock);
1740 err = -ENOENT;
1741 if (nlh->nlmsg_flags & NLM_F_CREATE)
1742 err = ctnetlink_create_expect(cda, u3);
1743 return err;
1744 }
1745
1746 err = -EEXIST;
1747 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1748 err = ctnetlink_change_expect(exp, cda);
1749 write_unlock_bh(&nf_conntrack_lock);
1750
1751 return err;
1752 }
1753
1754 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1755 static struct notifier_block ctnl_notifier = {
1756 .notifier_call = ctnetlink_conntrack_event,
1757 };
1758
1759 static struct notifier_block ctnl_notifier_exp = {
1760 .notifier_call = ctnetlink_expect_event,
1761 };
1762 #endif
1763
1764 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1765 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1766 .attr_count = CTA_MAX,
1767 .policy = ct_nla_policy },
1768 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1769 .attr_count = CTA_MAX,
1770 .policy = ct_nla_policy },
1771 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1772 .attr_count = CTA_MAX,
1773 .policy = ct_nla_policy },
1774 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1775 .attr_count = CTA_MAX,
1776 .policy = ct_nla_policy },
1777 };
1778
1779 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1780 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1781 .attr_count = CTA_EXPECT_MAX,
1782 .policy = exp_nla_policy },
1783 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1784 .attr_count = CTA_EXPECT_MAX,
1785 .policy = exp_nla_policy },
1786 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1787 .attr_count = CTA_EXPECT_MAX,
1788 .policy = exp_nla_policy },
1789 };
1790
1791 static const struct nfnetlink_subsystem ctnl_subsys = {
1792 .name = "conntrack",
1793 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1794 .cb_count = IPCTNL_MSG_MAX,
1795 .cb = ctnl_cb,
1796 };
1797
1798 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1799 .name = "conntrack_expect",
1800 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1801 .cb_count = IPCTNL_MSG_EXP_MAX,
1802 .cb = ctnl_exp_cb,
1803 };
1804
1805 MODULE_ALIAS("ip_conntrack_netlink");
1806 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1807 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1808
1809 static int __init ctnetlink_init(void)
1810 {
1811 int ret;
1812
1813 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1814 ret = nfnetlink_subsys_register(&ctnl_subsys);
1815 if (ret < 0) {
1816 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1817 goto err_out;
1818 }
1819
1820 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1821 if (ret < 0) {
1822 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1823 goto err_unreg_subsys;
1824 }
1825
1826 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1827 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1828 if (ret < 0) {
1829 printk("ctnetlink_init: cannot register notifier.\n");
1830 goto err_unreg_exp_subsys;
1831 }
1832
1833 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1834 if (ret < 0) {
1835 printk("ctnetlink_init: cannot expect register notifier.\n");
1836 goto err_unreg_notifier;
1837 }
1838 #endif
1839
1840 return 0;
1841
1842 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1843 err_unreg_notifier:
1844 nf_conntrack_unregister_notifier(&ctnl_notifier);
1845 err_unreg_exp_subsys:
1846 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1847 #endif
1848 err_unreg_subsys:
1849 nfnetlink_subsys_unregister(&ctnl_subsys);
1850 err_out:
1851 return ret;
1852 }
1853
1854 static void __exit ctnetlink_exit(void)
1855 {
1856 printk("ctnetlink: unregistering from nfnetlink.\n");
1857
1858 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1859 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1860 nf_conntrack_unregister_notifier(&ctnl_notifier);
1861 #endif
1862
1863 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1864 nfnetlink_subsys_unregister(&ctnl_subsys);
1865 return;
1866 }
1867
1868 module_init(ctnetlink_init);
1869 module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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