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netfilter: ctnetlink: group errors into logical errno sets
[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) 2005-2008 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;
149 struct nlattr *nest_proto;
150 int ret;
151
152 l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
153 if (!l4proto->to_nlattr) {
154 nf_ct_l4proto_put(l4proto);
155 return 0;
156 }
157
158 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
159 if (!nest_proto)
160 goto nla_put_failure;
161
162 ret = l4proto->to_nlattr(skb, nest_proto, ct);
163
164 nf_ct_l4proto_put(l4proto);
165
166 nla_nest_end(skb, nest_proto);
167
168 return ret;
169
170 nla_put_failure:
171 nf_ct_l4proto_put(l4proto);
172 return -1;
173 }
174
175 static inline int
176 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
177 {
178 struct nlattr *nest_helper;
179 const struct nf_conn_help *help = nfct_help(ct);
180 struct nf_conntrack_helper *helper;
181
182 if (!help)
183 return 0;
184
185 rcu_read_lock();
186 helper = rcu_dereference(help->helper);
187 if (!helper)
188 goto out;
189
190 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
191 if (!nest_helper)
192 goto nla_put_failure;
193 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
194
195 if (helper->to_nlattr)
196 helper->to_nlattr(skb, ct);
197
198 nla_nest_end(skb, nest_helper);
199 out:
200 rcu_read_unlock();
201 return 0;
202
203 nla_put_failure:
204 rcu_read_unlock();
205 return -1;
206 }
207
208 #ifdef CONFIG_NF_CT_ACCT
209 static int
210 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
211 enum ip_conntrack_dir dir)
212 {
213 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
214 struct nlattr *nest_count;
215
216 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
217 if (!nest_count)
218 goto nla_put_failure;
219
220 NLA_PUT_BE32(skb, CTA_COUNTERS32_PACKETS,
221 htonl(ct->counters[dir].packets));
222 NLA_PUT_BE32(skb, CTA_COUNTERS32_BYTES,
223 htonl(ct->counters[dir].bytes));
224
225 nla_nest_end(skb, nest_count);
226
227 return 0;
228
229 nla_put_failure:
230 return -1;
231 }
232 #else
233 #define ctnetlink_dump_counters(a, b, c) (0)
234 #endif
235
236 #ifdef CONFIG_NF_CONNTRACK_MARK
237 static inline int
238 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
239 {
240 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
241 return 0;
242
243 nla_put_failure:
244 return -1;
245 }
246 #else
247 #define ctnetlink_dump_mark(a, b) (0)
248 #endif
249
250 #ifdef CONFIG_NF_CONNTRACK_SECMARK
251 static inline int
252 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
253 {
254 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
255 return 0;
256
257 nla_put_failure:
258 return -1;
259 }
260 #else
261 #define ctnetlink_dump_secmark(a, b) (0)
262 #endif
263
264 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
265
266 static inline int
267 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
268 {
269 struct nlattr *nest_parms;
270
271 if (!(ct->status & IPS_EXPECTED))
272 return 0;
273
274 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
275 if (!nest_parms)
276 goto nla_put_failure;
277 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
278 goto nla_put_failure;
279 nla_nest_end(skb, nest_parms);
280
281 return 0;
282
283 nla_put_failure:
284 return -1;
285 }
286
287 #ifdef CONFIG_NF_NAT_NEEDED
288 static int
289 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
290 {
291 struct nlattr *nest_parms;
292
293 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
294 if (!nest_parms)
295 goto nla_put_failure;
296
297 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
298 htonl(natseq->correction_pos));
299 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
300 htonl(natseq->offset_before));
301 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
302 htonl(natseq->offset_after));
303
304 nla_nest_end(skb, nest_parms);
305
306 return 0;
307
308 nla_put_failure:
309 return -1;
310 }
311
312 static inline int
313 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
314 {
315 struct nf_nat_seq *natseq;
316 struct nf_conn_nat *nat = nfct_nat(ct);
317
318 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
319 return 0;
320
321 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
322 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
323 return -1;
324
325 natseq = &nat->seq[IP_CT_DIR_REPLY];
326 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
327 return -1;
328
329 return 0;
330 }
331 #else
332 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
333 #endif
334
335 static inline int
336 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
337 {
338 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
339 return 0;
340
341 nla_put_failure:
342 return -1;
343 }
344
345 static inline int
346 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
347 {
348 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
349 return 0;
350
351 nla_put_failure:
352 return -1;
353 }
354
355 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
356
357 static int
358 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
359 int event, int nowait,
360 const struct nf_conn *ct)
361 {
362 struct nlmsghdr *nlh;
363 struct nfgenmsg *nfmsg;
364 struct nlattr *nest_parms;
365 unsigned char *b = skb_tail_pointer(skb);
366
367 event |= NFNL_SUBSYS_CTNETLINK << 8;
368 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
369 nfmsg = NLMSG_DATA(nlh);
370
371 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
372 nfmsg->nfgen_family = nf_ct_l3num(ct);
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 = nf_ct_l3num(ct);
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 (ctnetlink_dump_id(skb, ct) < 0)
476 goto nla_put_failure;
477
478 if (events & IPCT_DESTROY) {
479 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
480 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
481 goto nla_put_failure;
482 } else {
483 if (ctnetlink_dump_status(skb, ct) < 0)
484 goto nla_put_failure;
485
486 if (ctnetlink_dump_timeout(skb, ct) < 0)
487 goto nla_put_failure;
488
489 if (events & IPCT_PROTOINFO
490 && ctnetlink_dump_protoinfo(skb, ct) < 0)
491 goto nla_put_failure;
492
493 if ((events & IPCT_HELPER || nfct_help(ct))
494 && ctnetlink_dump_helpinfo(skb, ct) < 0)
495 goto nla_put_failure;
496
497 #ifdef CONFIG_NF_CONNTRACK_SECMARK
498 if ((events & IPCT_SECMARK || ct->secmark)
499 && ctnetlink_dump_secmark(skb, ct) < 0)
500 goto nla_put_failure;
501 #endif
502
503 if (events & IPCT_COUNTER_FILLING &&
504 (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
505 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
506 goto nla_put_failure;
507
508 if (events & IPCT_RELATED &&
509 ctnetlink_dump_master(skb, ct) < 0)
510 goto nla_put_failure;
511
512 if (events & IPCT_NATSEQADJ &&
513 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
514 goto nla_put_failure;
515 }
516
517 #ifdef CONFIG_NF_CONNTRACK_MARK
518 if ((events & IPCT_MARK || ct->mark)
519 && ctnetlink_dump_mark(skb, ct) < 0)
520 goto nla_put_failure;
521 #endif
522
523 nlh->nlmsg_len = skb->tail - b;
524 nfnetlink_send(skb, 0, group, 0);
525 return NOTIFY_DONE;
526
527 nlmsg_failure:
528 nla_put_failure:
529 kfree_skb(skb);
530 return NOTIFY_DONE;
531 }
532 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
533
534 static int ctnetlink_done(struct netlink_callback *cb)
535 {
536 if (cb->args[1])
537 nf_ct_put((struct nf_conn *)cb->args[1]);
538 return 0;
539 }
540
541 static int
542 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
543 {
544 struct nf_conn *ct, *last;
545 struct nf_conntrack_tuple_hash *h;
546 struct hlist_node *n;
547 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
548 u_int8_t l3proto = nfmsg->nfgen_family;
549
550 rcu_read_lock();
551 last = (struct nf_conn *)cb->args[1];
552 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
553 restart:
554 hlist_for_each_entry_rcu(h, n, &nf_conntrack_hash[cb->args[0]],
555 hnode) {
556 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
557 continue;
558 ct = nf_ct_tuplehash_to_ctrack(h);
559 /* Dump entries of a given L3 protocol number.
560 * If it is not specified, ie. l3proto == 0,
561 * then dump everything. */
562 if (l3proto && nf_ct_l3num(ct) != l3proto)
563 continue;
564 if (cb->args[1]) {
565 if (ct != last)
566 continue;
567 cb->args[1] = 0;
568 }
569 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
570 cb->nlh->nlmsg_seq,
571 IPCTNL_MSG_CT_NEW,
572 1, ct) < 0) {
573 if (!atomic_inc_not_zero(&ct->ct_general.use))
574 continue;
575 cb->args[1] = (unsigned long)ct;
576 goto out;
577 }
578 #ifdef CONFIG_NF_CT_ACCT
579 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
580 IPCTNL_MSG_CT_GET_CTRZERO)
581 memset(&ct->counters, 0, sizeof(ct->counters));
582 #endif
583 }
584 if (cb->args[1]) {
585 cb->args[1] = 0;
586 goto restart;
587 }
588 }
589 out:
590 rcu_read_unlock();
591 if (last)
592 nf_ct_put(last);
593
594 return skb->len;
595 }
596
597 static inline int
598 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
599 {
600 struct nlattr *tb[CTA_IP_MAX+1];
601 struct nf_conntrack_l3proto *l3proto;
602 int ret = 0;
603
604 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
605
606 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
607
608 if (likely(l3proto->nlattr_to_tuple)) {
609 ret = nla_validate_nested(attr, CTA_IP_MAX,
610 l3proto->nla_policy);
611 if (ret == 0)
612 ret = l3proto->nlattr_to_tuple(tb, tuple);
613 }
614
615 nf_ct_l3proto_put(l3proto);
616
617 return ret;
618 }
619
620 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
621 [CTA_PROTO_NUM] = { .type = NLA_U8 },
622 };
623
624 static inline int
625 ctnetlink_parse_tuple_proto(struct nlattr *attr,
626 struct nf_conntrack_tuple *tuple)
627 {
628 struct nlattr *tb[CTA_PROTO_MAX+1];
629 struct nf_conntrack_l4proto *l4proto;
630 int ret = 0;
631
632 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
633 if (ret < 0)
634 return ret;
635
636 if (!tb[CTA_PROTO_NUM])
637 return -EINVAL;
638 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
639
640 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
641
642 if (likely(l4proto->nlattr_to_tuple)) {
643 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
644 l4proto->nla_policy);
645 if (ret == 0)
646 ret = l4proto->nlattr_to_tuple(tb, tuple);
647 }
648
649 nf_ct_l4proto_put(l4proto);
650
651 return ret;
652 }
653
654 static int
655 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
656 enum ctattr_tuple type, u_int8_t l3num)
657 {
658 struct nlattr *tb[CTA_TUPLE_MAX+1];
659 int err;
660
661 memset(tuple, 0, sizeof(*tuple));
662
663 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
664
665 if (!tb[CTA_TUPLE_IP])
666 return -EINVAL;
667
668 tuple->src.l3num = l3num;
669
670 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
671 if (err < 0)
672 return err;
673
674 if (!tb[CTA_TUPLE_PROTO])
675 return -EINVAL;
676
677 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
678 if (err < 0)
679 return err;
680
681 /* orig and expect tuples get DIR_ORIGINAL */
682 if (type == CTA_TUPLE_REPLY)
683 tuple->dst.dir = IP_CT_DIR_REPLY;
684 else
685 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
686
687 return 0;
688 }
689
690 #ifdef CONFIG_NF_NAT_NEEDED
691 static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
692 [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 },
693 [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 },
694 };
695
696 static int nfnetlink_parse_nat_proto(struct nlattr *attr,
697 const struct nf_conn *ct,
698 struct nf_nat_range *range)
699 {
700 struct nlattr *tb[CTA_PROTONAT_MAX+1];
701 const struct nf_nat_protocol *npt;
702 int err;
703
704 err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
705 if (err < 0)
706 return err;
707
708 npt = nf_nat_proto_find_get(nf_ct_protonum(ct));
709 if (npt->nlattr_to_range)
710 err = npt->nlattr_to_range(tb, range);
711 nf_nat_proto_put(npt);
712 return err;
713 }
714
715 static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
716 [CTA_NAT_MINIP] = { .type = NLA_U32 },
717 [CTA_NAT_MAXIP] = { .type = NLA_U32 },
718 };
719
720 static inline int
721 nfnetlink_parse_nat(struct nlattr *nat,
722 const struct nf_conn *ct, struct nf_nat_range *range)
723 {
724 struct nlattr *tb[CTA_NAT_MAX+1];
725 int err;
726
727 memset(range, 0, sizeof(*range));
728
729 err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
730 if (err < 0)
731 return err;
732
733 if (tb[CTA_NAT_MINIP])
734 range->min_ip = nla_get_be32(tb[CTA_NAT_MINIP]);
735
736 if (!tb[CTA_NAT_MAXIP])
737 range->max_ip = range->min_ip;
738 else
739 range->max_ip = nla_get_be32(tb[CTA_NAT_MAXIP]);
740
741 if (range->min_ip)
742 range->flags |= IP_NAT_RANGE_MAP_IPS;
743
744 if (!tb[CTA_NAT_PROTO])
745 return 0;
746
747 err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
748 if (err < 0)
749 return err;
750
751 return 0;
752 }
753 #endif
754
755 static inline int
756 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
757 {
758 struct nlattr *tb[CTA_HELP_MAX+1];
759
760 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
761
762 if (!tb[CTA_HELP_NAME])
763 return -EINVAL;
764
765 *helper_name = nla_data(tb[CTA_HELP_NAME]);
766
767 return 0;
768 }
769
770 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
771 [CTA_STATUS] = { .type = NLA_U32 },
772 [CTA_TIMEOUT] = { .type = NLA_U32 },
773 [CTA_MARK] = { .type = NLA_U32 },
774 [CTA_USE] = { .type = NLA_U32 },
775 [CTA_ID] = { .type = NLA_U32 },
776 };
777
778 static int
779 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
780 struct nlmsghdr *nlh, struct nlattr *cda[])
781 {
782 struct nf_conntrack_tuple_hash *h;
783 struct nf_conntrack_tuple tuple;
784 struct nf_conn *ct;
785 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
786 u_int8_t u3 = nfmsg->nfgen_family;
787 int err = 0;
788
789 if (cda[CTA_TUPLE_ORIG])
790 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
791 else if (cda[CTA_TUPLE_REPLY])
792 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
793 else {
794 /* Flush the whole table */
795 nf_conntrack_flush();
796 return 0;
797 }
798
799 if (err < 0)
800 return err;
801
802 h = nf_conntrack_find_get(&tuple);
803 if (!h)
804 return -ENOENT;
805
806 ct = nf_ct_tuplehash_to_ctrack(h);
807
808 if (cda[CTA_ID]) {
809 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
810 if (id != (u32)(unsigned long)ct) {
811 nf_ct_put(ct);
812 return -ENOENT;
813 }
814 }
815 if (del_timer(&ct->timeout))
816 ct->timeout.function((unsigned long)ct);
817
818 nf_ct_put(ct);
819
820 return 0;
821 }
822
823 static int
824 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
825 struct nlmsghdr *nlh, struct nlattr *cda[])
826 {
827 struct nf_conntrack_tuple_hash *h;
828 struct nf_conntrack_tuple tuple;
829 struct nf_conn *ct;
830 struct sk_buff *skb2 = NULL;
831 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
832 u_int8_t u3 = nfmsg->nfgen_family;
833 int err = 0;
834
835 if (nlh->nlmsg_flags & NLM_F_DUMP) {
836 #ifndef CONFIG_NF_CT_ACCT
837 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
838 return -ENOTSUPP;
839 #endif
840 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
841 ctnetlink_done);
842 }
843
844 if (cda[CTA_TUPLE_ORIG])
845 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
846 else if (cda[CTA_TUPLE_REPLY])
847 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
848 else
849 return -EINVAL;
850
851 if (err < 0)
852 return err;
853
854 h = nf_conntrack_find_get(&tuple);
855 if (!h)
856 return -ENOENT;
857
858 ct = nf_ct_tuplehash_to_ctrack(h);
859
860 err = -ENOMEM;
861 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
862 if (!skb2) {
863 nf_ct_put(ct);
864 return -ENOMEM;
865 }
866
867 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
868 IPCTNL_MSG_CT_NEW, 1, ct);
869 nf_ct_put(ct);
870 if (err <= 0)
871 goto free;
872
873 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
874 if (err < 0)
875 goto out;
876
877 return 0;
878
879 free:
880 kfree_skb(skb2);
881 out:
882 return err;
883 }
884
885 static int
886 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
887 {
888 unsigned long d;
889 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
890 d = ct->status ^ status;
891
892 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
893 /* unchangeable */
894 return -EBUSY;
895
896 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
897 /* SEEN_REPLY bit can only be set */
898 return -EBUSY;
899
900 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
901 /* ASSURED bit can only be set */
902 return -EBUSY;
903
904 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
905 #ifndef CONFIG_NF_NAT_NEEDED
906 return -EOPNOTSUPP;
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 -EBUSY;
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 -EOPNOTSUPP;
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 int err = 0;
1005
1006 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1007
1008 l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
1009 if (l4proto->from_nlattr)
1010 err = l4proto->from_nlattr(tb, ct);
1011 nf_ct_l4proto_put(l4proto);
1012
1013 return err;
1014 }
1015
1016 #ifdef CONFIG_NF_NAT_NEEDED
1017 static inline int
1018 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1019 {
1020 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1021
1022 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1023
1024 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1025 return -EINVAL;
1026
1027 natseq->correction_pos =
1028 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1029
1030 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1031 return -EINVAL;
1032
1033 natseq->offset_before =
1034 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1035
1036 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1037 return -EINVAL;
1038
1039 natseq->offset_after =
1040 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1041
1042 return 0;
1043 }
1044
1045 static int
1046 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1047 {
1048 int ret = 0;
1049 struct nf_conn_nat *nat = nfct_nat(ct);
1050
1051 if (!nat)
1052 return 0;
1053
1054 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1055 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1056 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1057 if (ret < 0)
1058 return ret;
1059
1060 ct->status |= IPS_SEQ_ADJUST;
1061 }
1062
1063 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1064 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1065 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1066 if (ret < 0)
1067 return ret;
1068
1069 ct->status |= IPS_SEQ_ADJUST;
1070 }
1071
1072 return 0;
1073 }
1074 #endif
1075
1076 static int
1077 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1078 {
1079 int err;
1080
1081 if (cda[CTA_HELP]) {
1082 err = ctnetlink_change_helper(ct, cda);
1083 if (err < 0)
1084 return err;
1085 }
1086
1087 if (cda[CTA_TIMEOUT]) {
1088 err = ctnetlink_change_timeout(ct, cda);
1089 if (err < 0)
1090 return err;
1091 }
1092
1093 if (cda[CTA_STATUS]) {
1094 err = ctnetlink_change_status(ct, cda);
1095 if (err < 0)
1096 return err;
1097 }
1098
1099 if (cda[CTA_PROTOINFO]) {
1100 err = ctnetlink_change_protoinfo(ct, cda);
1101 if (err < 0)
1102 return err;
1103 }
1104
1105 #if defined(CONFIG_NF_CONNTRACK_MARK)
1106 if (cda[CTA_MARK])
1107 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1108 #endif
1109
1110 #ifdef CONFIG_NF_NAT_NEEDED
1111 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1112 err = ctnetlink_change_nat_seq_adj(ct, cda);
1113 if (err < 0)
1114 return err;
1115 }
1116 #endif
1117
1118 return 0;
1119 }
1120
1121 static int
1122 ctnetlink_create_conntrack(struct nlattr *cda[],
1123 struct nf_conntrack_tuple *otuple,
1124 struct nf_conntrack_tuple *rtuple,
1125 struct nf_conn *master_ct)
1126 {
1127 struct nf_conn *ct;
1128 int err = -EINVAL;
1129 struct nf_conn_help *help;
1130 struct nf_conntrack_helper *helper;
1131
1132 ct = nf_conntrack_alloc(otuple, rtuple);
1133 if (ct == NULL || IS_ERR(ct))
1134 return -ENOMEM;
1135
1136 if (!cda[CTA_TIMEOUT])
1137 goto err;
1138 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1139
1140 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1141 ct->status |= IPS_CONFIRMED;
1142
1143 if (cda[CTA_STATUS]) {
1144 err = ctnetlink_change_status(ct, cda);
1145 if (err < 0)
1146 goto err;
1147 }
1148
1149 if (cda[CTA_PROTOINFO]) {
1150 err = ctnetlink_change_protoinfo(ct, cda);
1151 if (err < 0)
1152 goto err;
1153 }
1154
1155 #if defined(CONFIG_NF_CONNTRACK_MARK)
1156 if (cda[CTA_MARK])
1157 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1158 #endif
1159
1160 rcu_read_lock();
1161 helper = __nf_ct_helper_find(rtuple);
1162 if (helper) {
1163 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
1164 if (help == NULL) {
1165 rcu_read_unlock();
1166 err = -ENOMEM;
1167 goto err;
1168 }
1169 /* not in hash table yet so not strictly necessary */
1170 rcu_assign_pointer(help->helper, helper);
1171 }
1172
1173 /* setup master conntrack: this is a confirmed expectation */
1174 if (master_ct) {
1175 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1176 ct->master = master_ct;
1177 }
1178
1179 add_timer(&ct->timeout);
1180 nf_conntrack_hash_insert(ct);
1181 rcu_read_unlock();
1182
1183 return 0;
1184
1185 err:
1186 nf_conntrack_free(ct);
1187 return err;
1188 }
1189
1190 static int
1191 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1192 struct nlmsghdr *nlh, struct nlattr *cda[])
1193 {
1194 struct nf_conntrack_tuple otuple, rtuple;
1195 struct nf_conntrack_tuple_hash *h = NULL;
1196 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1197 u_int8_t u3 = nfmsg->nfgen_family;
1198 int err = 0;
1199
1200 if (cda[CTA_TUPLE_ORIG]) {
1201 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1202 if (err < 0)
1203 return err;
1204 }
1205
1206 if (cda[CTA_TUPLE_REPLY]) {
1207 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1208 if (err < 0)
1209 return err;
1210 }
1211
1212 spin_lock_bh(&nf_conntrack_lock);
1213 if (cda[CTA_TUPLE_ORIG])
1214 h = __nf_conntrack_find(&otuple);
1215 else if (cda[CTA_TUPLE_REPLY])
1216 h = __nf_conntrack_find(&rtuple);
1217
1218 if (h == NULL) {
1219 struct nf_conntrack_tuple master;
1220 struct nf_conntrack_tuple_hash *master_h = NULL;
1221 struct nf_conn *master_ct = NULL;
1222
1223 if (cda[CTA_TUPLE_MASTER]) {
1224 err = ctnetlink_parse_tuple(cda,
1225 &master,
1226 CTA_TUPLE_MASTER,
1227 u3);
1228 if (err < 0)
1229 goto out_unlock;
1230
1231 master_h = __nf_conntrack_find(&master);
1232 if (master_h == NULL) {
1233 err = -ENOENT;
1234 goto out_unlock;
1235 }
1236 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1237 atomic_inc(&master_ct->ct_general.use);
1238 }
1239
1240 spin_unlock_bh(&nf_conntrack_lock);
1241 err = -ENOENT;
1242 if (nlh->nlmsg_flags & NLM_F_CREATE)
1243 err = ctnetlink_create_conntrack(cda,
1244 &otuple,
1245 &rtuple,
1246 master_ct);
1247 if (err < 0 && master_ct)
1248 nf_ct_put(master_ct);
1249
1250 return err;
1251 }
1252 /* implicit 'else' */
1253
1254 /* We manipulate the conntrack inside the global conntrack table lock,
1255 * so there's no need to increase the refcount */
1256 err = -EEXIST;
1257 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1258 /* we only allow nat config for new conntracks */
1259 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1260 err = -EOPNOTSUPP;
1261 goto out_unlock;
1262 }
1263 /* can't link an existing conntrack to a master */
1264 if (cda[CTA_TUPLE_MASTER]) {
1265 err = -EOPNOTSUPP;
1266 goto out_unlock;
1267 }
1268 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1269 cda);
1270 }
1271
1272 out_unlock:
1273 spin_unlock_bh(&nf_conntrack_lock);
1274 return err;
1275 }
1276
1277 /***********************************************************************
1278 * EXPECT
1279 ***********************************************************************/
1280
1281 static inline int
1282 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1283 const struct nf_conntrack_tuple *tuple,
1284 enum ctattr_expect type)
1285 {
1286 struct nlattr *nest_parms;
1287
1288 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1289 if (!nest_parms)
1290 goto nla_put_failure;
1291 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1292 goto nla_put_failure;
1293 nla_nest_end(skb, nest_parms);
1294
1295 return 0;
1296
1297 nla_put_failure:
1298 return -1;
1299 }
1300
1301 static inline int
1302 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1303 const struct nf_conntrack_tuple *tuple,
1304 const struct nf_conntrack_tuple_mask *mask)
1305 {
1306 int ret;
1307 struct nf_conntrack_l3proto *l3proto;
1308 struct nf_conntrack_l4proto *l4proto;
1309 struct nf_conntrack_tuple m;
1310 struct nlattr *nest_parms;
1311
1312 memset(&m, 0xFF, sizeof(m));
1313 m.src.u.all = mask->src.u.all;
1314 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1315
1316 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1317 if (!nest_parms)
1318 goto nla_put_failure;
1319
1320 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1321 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1322 nf_ct_l3proto_put(l3proto);
1323
1324 if (unlikely(ret < 0))
1325 goto nla_put_failure;
1326
1327 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1328 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1329 nf_ct_l4proto_put(l4proto);
1330 if (unlikely(ret < 0))
1331 goto nla_put_failure;
1332
1333 nla_nest_end(skb, nest_parms);
1334
1335 return 0;
1336
1337 nla_put_failure:
1338 return -1;
1339 }
1340
1341 static int
1342 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1343 const struct nf_conntrack_expect *exp)
1344 {
1345 struct nf_conn *master = exp->master;
1346 long timeout = (exp->timeout.expires - jiffies) / HZ;
1347
1348 if (timeout < 0)
1349 timeout = 0;
1350
1351 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1352 goto nla_put_failure;
1353 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1354 goto nla_put_failure;
1355 if (ctnetlink_exp_dump_tuple(skb,
1356 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1357 CTA_EXPECT_MASTER) < 0)
1358 goto nla_put_failure;
1359
1360 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1361 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1362
1363 return 0;
1364
1365 nla_put_failure:
1366 return -1;
1367 }
1368
1369 static int
1370 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1371 int event,
1372 int nowait,
1373 const struct nf_conntrack_expect *exp)
1374 {
1375 struct nlmsghdr *nlh;
1376 struct nfgenmsg *nfmsg;
1377 unsigned char *b = skb_tail_pointer(skb);
1378
1379 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1380 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1381 nfmsg = NLMSG_DATA(nlh);
1382
1383 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1384 nfmsg->nfgen_family = exp->tuple.src.l3num;
1385 nfmsg->version = NFNETLINK_V0;
1386 nfmsg->res_id = 0;
1387
1388 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1389 goto nla_put_failure;
1390
1391 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1392 return skb->len;
1393
1394 nlmsg_failure:
1395 nla_put_failure:
1396 nlmsg_trim(skb, b);
1397 return -1;
1398 }
1399
1400 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1401 static int ctnetlink_expect_event(struct notifier_block *this,
1402 unsigned long events, void *ptr)
1403 {
1404 struct nlmsghdr *nlh;
1405 struct nfgenmsg *nfmsg;
1406 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1407 struct sk_buff *skb;
1408 unsigned int type;
1409 sk_buff_data_t b;
1410 int flags = 0;
1411
1412 if (events & IPEXP_NEW) {
1413 type = IPCTNL_MSG_EXP_NEW;
1414 flags = NLM_F_CREATE|NLM_F_EXCL;
1415 } else
1416 return NOTIFY_DONE;
1417
1418 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1419 return NOTIFY_DONE;
1420
1421 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1422 if (!skb)
1423 return NOTIFY_DONE;
1424
1425 b = skb->tail;
1426
1427 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1428 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1429 nfmsg = NLMSG_DATA(nlh);
1430
1431 nlh->nlmsg_flags = flags;
1432 nfmsg->nfgen_family = exp->tuple.src.l3num;
1433 nfmsg->version = NFNETLINK_V0;
1434 nfmsg->res_id = 0;
1435
1436 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1437 goto nla_put_failure;
1438
1439 nlh->nlmsg_len = skb->tail - b;
1440 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1441 return NOTIFY_DONE;
1442
1443 nlmsg_failure:
1444 nla_put_failure:
1445 kfree_skb(skb);
1446 return NOTIFY_DONE;
1447 }
1448 #endif
1449 static int ctnetlink_exp_done(struct netlink_callback *cb)
1450 {
1451 if (cb->args[1])
1452 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1453 return 0;
1454 }
1455
1456 static int
1457 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1458 {
1459 struct nf_conntrack_expect *exp, *last;
1460 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1461 struct hlist_node *n;
1462 u_int8_t l3proto = nfmsg->nfgen_family;
1463
1464 rcu_read_lock();
1465 last = (struct nf_conntrack_expect *)cb->args[1];
1466 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1467 restart:
1468 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1469 hnode) {
1470 if (l3proto && exp->tuple.src.l3num != l3proto)
1471 continue;
1472 if (cb->args[1]) {
1473 if (exp != last)
1474 continue;
1475 cb->args[1] = 0;
1476 }
1477 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1478 cb->nlh->nlmsg_seq,
1479 IPCTNL_MSG_EXP_NEW,
1480 1, exp) < 0) {
1481 if (!atomic_inc_not_zero(&exp->use))
1482 continue;
1483 cb->args[1] = (unsigned long)exp;
1484 goto out;
1485 }
1486 }
1487 if (cb->args[1]) {
1488 cb->args[1] = 0;
1489 goto restart;
1490 }
1491 }
1492 out:
1493 rcu_read_unlock();
1494 if (last)
1495 nf_ct_expect_put(last);
1496
1497 return skb->len;
1498 }
1499
1500 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1501 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1502 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1503 };
1504
1505 static int
1506 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1507 struct nlmsghdr *nlh, struct nlattr *cda[])
1508 {
1509 struct nf_conntrack_tuple tuple;
1510 struct nf_conntrack_expect *exp;
1511 struct sk_buff *skb2;
1512 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1513 u_int8_t u3 = nfmsg->nfgen_family;
1514 int err = 0;
1515
1516 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1517 return netlink_dump_start(ctnl, skb, nlh,
1518 ctnetlink_exp_dump_table,
1519 ctnetlink_exp_done);
1520 }
1521
1522 if (cda[CTA_EXPECT_MASTER])
1523 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1524 else
1525 return -EINVAL;
1526
1527 if (err < 0)
1528 return err;
1529
1530 exp = nf_ct_expect_find_get(&tuple);
1531 if (!exp)
1532 return -ENOENT;
1533
1534 if (cda[CTA_EXPECT_ID]) {
1535 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1536 if (ntohl(id) != (u32)(unsigned long)exp) {
1537 nf_ct_expect_put(exp);
1538 return -ENOENT;
1539 }
1540 }
1541
1542 err = -ENOMEM;
1543 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1544 if (!skb2)
1545 goto out;
1546
1547 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1548 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1549 1, exp);
1550 if (err <= 0)
1551 goto free;
1552
1553 nf_ct_expect_put(exp);
1554
1555 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1556
1557 free:
1558 kfree_skb(skb2);
1559 out:
1560 nf_ct_expect_put(exp);
1561 return err;
1562 }
1563
1564 static int
1565 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1566 struct nlmsghdr *nlh, struct nlattr *cda[])
1567 {
1568 struct nf_conntrack_expect *exp;
1569 struct nf_conntrack_tuple tuple;
1570 struct nf_conntrack_helper *h;
1571 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1572 struct hlist_node *n, *next;
1573 u_int8_t u3 = nfmsg->nfgen_family;
1574 unsigned int i;
1575 int err;
1576
1577 if (cda[CTA_EXPECT_TUPLE]) {
1578 /* delete a single expect by tuple */
1579 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1580 if (err < 0)
1581 return err;
1582
1583 /* bump usage count to 2 */
1584 exp = nf_ct_expect_find_get(&tuple);
1585 if (!exp)
1586 return -ENOENT;
1587
1588 if (cda[CTA_EXPECT_ID]) {
1589 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1590 if (ntohl(id) != (u32)(unsigned long)exp) {
1591 nf_ct_expect_put(exp);
1592 return -ENOENT;
1593 }
1594 }
1595
1596 /* after list removal, usage count == 1 */
1597 nf_ct_unexpect_related(exp);
1598 /* have to put what we 'get' above.
1599 * after this line usage count == 0 */
1600 nf_ct_expect_put(exp);
1601 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1602 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1603 struct nf_conn_help *m_help;
1604
1605 /* delete all expectations for this helper */
1606 spin_lock_bh(&nf_conntrack_lock);
1607 h = __nf_conntrack_helper_find_byname(name);
1608 if (!h) {
1609 spin_unlock_bh(&nf_conntrack_lock);
1610 return -EOPNOTSUPP;
1611 }
1612 for (i = 0; i < nf_ct_expect_hsize; i++) {
1613 hlist_for_each_entry_safe(exp, n, next,
1614 &nf_ct_expect_hash[i],
1615 hnode) {
1616 m_help = nfct_help(exp->master);
1617 if (m_help->helper == h
1618 && del_timer(&exp->timeout)) {
1619 nf_ct_unlink_expect(exp);
1620 nf_ct_expect_put(exp);
1621 }
1622 }
1623 }
1624 spin_unlock_bh(&nf_conntrack_lock);
1625 } else {
1626 /* This basically means we have to flush everything*/
1627 spin_lock_bh(&nf_conntrack_lock);
1628 for (i = 0; i < nf_ct_expect_hsize; i++) {
1629 hlist_for_each_entry_safe(exp, n, next,
1630 &nf_ct_expect_hash[i],
1631 hnode) {
1632 if (del_timer(&exp->timeout)) {
1633 nf_ct_unlink_expect(exp);
1634 nf_ct_expect_put(exp);
1635 }
1636 }
1637 }
1638 spin_unlock_bh(&nf_conntrack_lock);
1639 }
1640
1641 return 0;
1642 }
1643 static int
1644 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1645 {
1646 return -EOPNOTSUPP;
1647 }
1648
1649 static int
1650 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1651 {
1652 struct nf_conntrack_tuple tuple, mask, master_tuple;
1653 struct nf_conntrack_tuple_hash *h = NULL;
1654 struct nf_conntrack_expect *exp;
1655 struct nf_conn *ct;
1656 struct nf_conn_help *help;
1657 int err = 0;
1658
1659 /* caller guarantees that those three CTA_EXPECT_* exist */
1660 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1661 if (err < 0)
1662 return err;
1663 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1664 if (err < 0)
1665 return err;
1666 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1667 if (err < 0)
1668 return err;
1669
1670 /* Look for master conntrack of this expectation */
1671 h = nf_conntrack_find_get(&master_tuple);
1672 if (!h)
1673 return -ENOENT;
1674 ct = nf_ct_tuplehash_to_ctrack(h);
1675 help = nfct_help(ct);
1676
1677 if (!help || !help->helper) {
1678 /* such conntrack hasn't got any helper, abort */
1679 err = -EINVAL;
1680 goto out;
1681 }
1682
1683 exp = nf_ct_expect_alloc(ct);
1684 if (!exp) {
1685 err = -ENOMEM;
1686 goto out;
1687 }
1688
1689 exp->expectfn = NULL;
1690 exp->flags = 0;
1691 exp->master = ct;
1692 exp->helper = NULL;
1693 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1694 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1695 exp->mask.src.u.all = mask.src.u.all;
1696
1697 err = nf_ct_expect_related(exp);
1698 nf_ct_expect_put(exp);
1699
1700 out:
1701 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1702 return err;
1703 }
1704
1705 static int
1706 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1707 struct nlmsghdr *nlh, struct nlattr *cda[])
1708 {
1709 struct nf_conntrack_tuple tuple;
1710 struct nf_conntrack_expect *exp;
1711 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1712 u_int8_t u3 = nfmsg->nfgen_family;
1713 int err = 0;
1714
1715 if (!cda[CTA_EXPECT_TUPLE]
1716 || !cda[CTA_EXPECT_MASK]
1717 || !cda[CTA_EXPECT_MASTER])
1718 return -EINVAL;
1719
1720 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1721 if (err < 0)
1722 return err;
1723
1724 spin_lock_bh(&nf_conntrack_lock);
1725 exp = __nf_ct_expect_find(&tuple);
1726
1727 if (!exp) {
1728 spin_unlock_bh(&nf_conntrack_lock);
1729 err = -ENOENT;
1730 if (nlh->nlmsg_flags & NLM_F_CREATE)
1731 err = ctnetlink_create_expect(cda, u3);
1732 return err;
1733 }
1734
1735 err = -EEXIST;
1736 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1737 err = ctnetlink_change_expect(exp, cda);
1738 spin_unlock_bh(&nf_conntrack_lock);
1739
1740 return err;
1741 }
1742
1743 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1744 static struct notifier_block ctnl_notifier = {
1745 .notifier_call = ctnetlink_conntrack_event,
1746 };
1747
1748 static struct notifier_block ctnl_notifier_exp = {
1749 .notifier_call = ctnetlink_expect_event,
1750 };
1751 #endif
1752
1753 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1754 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1755 .attr_count = CTA_MAX,
1756 .policy = ct_nla_policy },
1757 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1758 .attr_count = CTA_MAX,
1759 .policy = ct_nla_policy },
1760 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1761 .attr_count = CTA_MAX,
1762 .policy = ct_nla_policy },
1763 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1764 .attr_count = CTA_MAX,
1765 .policy = ct_nla_policy },
1766 };
1767
1768 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1769 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1770 .attr_count = CTA_EXPECT_MAX,
1771 .policy = exp_nla_policy },
1772 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1773 .attr_count = CTA_EXPECT_MAX,
1774 .policy = exp_nla_policy },
1775 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1776 .attr_count = CTA_EXPECT_MAX,
1777 .policy = exp_nla_policy },
1778 };
1779
1780 static const struct nfnetlink_subsystem ctnl_subsys = {
1781 .name = "conntrack",
1782 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1783 .cb_count = IPCTNL_MSG_MAX,
1784 .cb = ctnl_cb,
1785 };
1786
1787 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1788 .name = "conntrack_expect",
1789 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1790 .cb_count = IPCTNL_MSG_EXP_MAX,
1791 .cb = ctnl_exp_cb,
1792 };
1793
1794 MODULE_ALIAS("ip_conntrack_netlink");
1795 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1796 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1797
1798 static int __init ctnetlink_init(void)
1799 {
1800 int ret;
1801
1802 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1803 ret = nfnetlink_subsys_register(&ctnl_subsys);
1804 if (ret < 0) {
1805 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1806 goto err_out;
1807 }
1808
1809 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1810 if (ret < 0) {
1811 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1812 goto err_unreg_subsys;
1813 }
1814
1815 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1816 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1817 if (ret < 0) {
1818 printk("ctnetlink_init: cannot register notifier.\n");
1819 goto err_unreg_exp_subsys;
1820 }
1821
1822 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1823 if (ret < 0) {
1824 printk("ctnetlink_init: cannot expect register notifier.\n");
1825 goto err_unreg_notifier;
1826 }
1827 #endif
1828
1829 return 0;
1830
1831 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1832 err_unreg_notifier:
1833 nf_conntrack_unregister_notifier(&ctnl_notifier);
1834 err_unreg_exp_subsys:
1835 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1836 #endif
1837 err_unreg_subsys:
1838 nfnetlink_subsys_unregister(&ctnl_subsys);
1839 err_out:
1840 return ret;
1841 }
1842
1843 static void __exit ctnetlink_exit(void)
1844 {
1845 printk("ctnetlink: unregistering from nfnetlink.\n");
1846
1847 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1848 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1849 nf_conntrack_unregister_notifier(&ctnl_notifier);
1850 #endif
1851
1852 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1853 nfnetlink_subsys_unregister(&ctnl_subsys);
1854 return;
1855 }
1856
1857 module_init(ctnetlink_init);
1858 module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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