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[mirror_ubuntu-zesty-kernel.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/rculist.h>
22 #include <linux/types.h>
23 #include <linux/timer.h>
24 #include <linux/skbuff.h>
25 #include <linux/errno.h>
26 #include <linux/netlink.h>
27 #include <linux/spinlock.h>
28 #include <linux/interrupt.h>
29 #include <linux/notifier.h>
30
31 #include <linux/netfilter.h>
32 #include <net/netlink.h>
33 #include <net/netfilter/nf_conntrack.h>
34 #include <net/netfilter/nf_conntrack_core.h>
35 #include <net/netfilter/nf_conntrack_expect.h>
36 #include <net/netfilter/nf_conntrack_helper.h>
37 #include <net/netfilter/nf_conntrack_l3proto.h>
38 #include <net/netfilter/nf_conntrack_l4proto.h>
39 #include <net/netfilter/nf_conntrack_tuple.h>
40 #include <net/netfilter/nf_conntrack_acct.h>
41 #ifdef CONFIG_NF_NAT_NEEDED
42 #include <net/netfilter/nf_nat_core.h>
43 #include <net/netfilter/nf_nat_protocol.h>
44 #endif
45
46 #include <linux/netfilter/nfnetlink.h>
47 #include <linux/netfilter/nfnetlink_conntrack.h>
48
49 MODULE_LICENSE("GPL");
50
51 static char __initdata version[] = "0.93";
52
53 static inline int
54 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
55 const struct nf_conntrack_tuple *tuple,
56 struct nf_conntrack_l4proto *l4proto)
57 {
58 int ret = 0;
59 struct nlattr *nest_parms;
60
61 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
62 if (!nest_parms)
63 goto nla_put_failure;
64 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
65
66 if (likely(l4proto->tuple_to_nlattr))
67 ret = l4proto->tuple_to_nlattr(skb, tuple);
68
69 nla_nest_end(skb, nest_parms);
70
71 return ret;
72
73 nla_put_failure:
74 return -1;
75 }
76
77 static inline int
78 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
79 const struct nf_conntrack_tuple *tuple,
80 struct nf_conntrack_l3proto *l3proto)
81 {
82 int ret = 0;
83 struct nlattr *nest_parms;
84
85 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
86 if (!nest_parms)
87 goto nla_put_failure;
88
89 if (likely(l3proto->tuple_to_nlattr))
90 ret = l3proto->tuple_to_nlattr(skb, tuple);
91
92 nla_nest_end(skb, nest_parms);
93
94 return ret;
95
96 nla_put_failure:
97 return -1;
98 }
99
100 static int
101 ctnetlink_dump_tuples(struct sk_buff *skb,
102 const struct nf_conntrack_tuple *tuple)
103 {
104 int ret;
105 struct nf_conntrack_l3proto *l3proto;
106 struct nf_conntrack_l4proto *l4proto;
107
108 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
109 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
110 nf_ct_l3proto_put(l3proto);
111
112 if (unlikely(ret < 0))
113 return ret;
114
115 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
116 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
117 nf_ct_l4proto_put(l4proto);
118
119 return ret;
120 }
121
122 static inline int
123 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
124 {
125 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
126 return 0;
127
128 nla_put_failure:
129 return -1;
130 }
131
132 static inline int
133 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
134 {
135 long timeout = (ct->timeout.expires - jiffies) / HZ;
136
137 if (timeout < 0)
138 timeout = 0;
139
140 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
141 return 0;
142
143 nla_put_failure:
144 return -1;
145 }
146
147 static inline int
148 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
149 {
150 struct nf_conntrack_l4proto *l4proto;
151 struct nlattr *nest_proto;
152 int ret;
153
154 l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
155 if (!l4proto->to_nlattr) {
156 nf_ct_l4proto_put(l4proto);
157 return 0;
158 }
159
160 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
161 if (!nest_proto)
162 goto nla_put_failure;
163
164 ret = l4proto->to_nlattr(skb, nest_proto, ct);
165
166 nf_ct_l4proto_put(l4proto);
167
168 nla_nest_end(skb, nest_proto);
169
170 return ret;
171
172 nla_put_failure:
173 nf_ct_l4proto_put(l4proto);
174 return -1;
175 }
176
177 static inline int
178 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
179 {
180 struct nlattr *nest_helper;
181 const struct nf_conn_help *help = nfct_help(ct);
182 struct nf_conntrack_helper *helper;
183
184 if (!help)
185 return 0;
186
187 rcu_read_lock();
188 helper = rcu_dereference(help->helper);
189 if (!helper)
190 goto out;
191
192 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
193 if (!nest_helper)
194 goto nla_put_failure;
195 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
196
197 if (helper->to_nlattr)
198 helper->to_nlattr(skb, ct);
199
200 nla_nest_end(skb, nest_helper);
201 out:
202 rcu_read_unlock();
203 return 0;
204
205 nla_put_failure:
206 rcu_read_unlock();
207 return -1;
208 }
209
210 static int
211 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
212 enum ip_conntrack_dir dir)
213 {
214 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
215 struct nlattr *nest_count;
216 const struct nf_conn_counter *acct;
217
218 acct = nf_conn_acct_find(ct);
219 if (!acct)
220 return 0;
221
222 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
223 if (!nest_count)
224 goto nla_put_failure;
225
226 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
227 cpu_to_be64(acct[dir].packets));
228 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
229 cpu_to_be64(acct[dir].bytes));
230
231 nla_nest_end(skb, nest_count);
232
233 return 0;
234
235 nla_put_failure:
236 return -1;
237 }
238
239 #ifdef CONFIG_NF_CONNTRACK_MARK
240 static inline int
241 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
242 {
243 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
244 return 0;
245
246 nla_put_failure:
247 return -1;
248 }
249 #else
250 #define ctnetlink_dump_mark(a, b) (0)
251 #endif
252
253 #ifdef CONFIG_NF_CONNTRACK_SECMARK
254 static inline int
255 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
256 {
257 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
258 return 0;
259
260 nla_put_failure:
261 return -1;
262 }
263 #else
264 #define ctnetlink_dump_secmark(a, b) (0)
265 #endif
266
267 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
268
269 static inline int
270 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
271 {
272 struct nlattr *nest_parms;
273
274 if (!(ct->status & IPS_EXPECTED))
275 return 0;
276
277 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
278 if (!nest_parms)
279 goto nla_put_failure;
280 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
281 goto nla_put_failure;
282 nla_nest_end(skb, nest_parms);
283
284 return 0;
285
286 nla_put_failure:
287 return -1;
288 }
289
290 #ifdef CONFIG_NF_NAT_NEEDED
291 static int
292 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
293 {
294 struct nlattr *nest_parms;
295
296 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
297 if (!nest_parms)
298 goto nla_put_failure;
299
300 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
301 htonl(natseq->correction_pos));
302 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
303 htonl(natseq->offset_before));
304 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
305 htonl(natseq->offset_after));
306
307 nla_nest_end(skb, nest_parms);
308
309 return 0;
310
311 nla_put_failure:
312 return -1;
313 }
314
315 static inline int
316 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
317 {
318 struct nf_nat_seq *natseq;
319 struct nf_conn_nat *nat = nfct_nat(ct);
320
321 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
322 return 0;
323
324 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
325 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
326 return -1;
327
328 natseq = &nat->seq[IP_CT_DIR_REPLY];
329 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
330 return -1;
331
332 return 0;
333 }
334 #else
335 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
336 #endif
337
338 static inline int
339 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
340 {
341 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
342 return 0;
343
344 nla_put_failure:
345 return -1;
346 }
347
348 static inline int
349 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
350 {
351 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
352 return 0;
353
354 nla_put_failure:
355 return -1;
356 }
357
358 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
359
360 static int
361 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
362 int event, int nowait,
363 const struct nf_conn *ct)
364 {
365 struct nlmsghdr *nlh;
366 struct nfgenmsg *nfmsg;
367 struct nlattr *nest_parms;
368 unsigned char *b = skb_tail_pointer(skb);
369
370 event |= NFNL_SUBSYS_CTNETLINK << 8;
371 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
372 nfmsg = NLMSG_DATA(nlh);
373
374 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
375 nfmsg->nfgen_family = nf_ct_l3num(ct);
376 nfmsg->version = NFNETLINK_V0;
377 nfmsg->res_id = 0;
378
379 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
380 if (!nest_parms)
381 goto nla_put_failure;
382 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
383 goto nla_put_failure;
384 nla_nest_end(skb, nest_parms);
385
386 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
387 if (!nest_parms)
388 goto nla_put_failure;
389 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
390 goto nla_put_failure;
391 nla_nest_end(skb, nest_parms);
392
393 if (ctnetlink_dump_status(skb, ct) < 0 ||
394 ctnetlink_dump_timeout(skb, ct) < 0 ||
395 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
396 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
397 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
398 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
399 ctnetlink_dump_mark(skb, ct) < 0 ||
400 ctnetlink_dump_secmark(skb, ct) < 0 ||
401 ctnetlink_dump_id(skb, ct) < 0 ||
402 ctnetlink_dump_use(skb, ct) < 0 ||
403 ctnetlink_dump_master(skb, ct) < 0 ||
404 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
405 goto nla_put_failure;
406
407 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
408 return skb->len;
409
410 nlmsg_failure:
411 nla_put_failure:
412 nlmsg_trim(skb, b);
413 return -1;
414 }
415
416 #ifdef CONFIG_NF_CONNTRACK_EVENTS
417 static int ctnetlink_conntrack_event(struct notifier_block *this,
418 unsigned long events, void *ptr)
419 {
420 struct nlmsghdr *nlh;
421 struct nfgenmsg *nfmsg;
422 struct nlattr *nest_parms;
423 struct nf_conn *ct = (struct nf_conn *)ptr;
424 struct sk_buff *skb;
425 unsigned int type;
426 sk_buff_data_t b;
427 unsigned int flags = 0, group;
428
429 /* ignore our fake conntrack entry */
430 if (ct == &nf_conntrack_untracked)
431 return NOTIFY_DONE;
432
433 if (events & IPCT_DESTROY) {
434 type = IPCTNL_MSG_CT_DELETE;
435 group = NFNLGRP_CONNTRACK_DESTROY;
436 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
437 type = IPCTNL_MSG_CT_NEW;
438 flags = NLM_F_CREATE|NLM_F_EXCL;
439 group = NFNLGRP_CONNTRACK_NEW;
440 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
441 type = IPCTNL_MSG_CT_NEW;
442 group = NFNLGRP_CONNTRACK_UPDATE;
443 } else
444 return NOTIFY_DONE;
445
446 if (!nfnetlink_has_listeners(group))
447 return NOTIFY_DONE;
448
449 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
450 if (!skb)
451 return NOTIFY_DONE;
452
453 b = skb->tail;
454
455 type |= NFNL_SUBSYS_CTNETLINK << 8;
456 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
457 nfmsg = NLMSG_DATA(nlh);
458
459 nlh->nlmsg_flags = flags;
460 nfmsg->nfgen_family = nf_ct_l3num(ct);
461 nfmsg->version = NFNETLINK_V0;
462 nfmsg->res_id = 0;
463
464 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
465 if (!nest_parms)
466 goto nla_put_failure;
467 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
468 goto nla_put_failure;
469 nla_nest_end(skb, nest_parms);
470
471 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
472 if (!nest_parms)
473 goto nla_put_failure;
474 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
475 goto nla_put_failure;
476 nla_nest_end(skb, nest_parms);
477
478 if (ctnetlink_dump_id(skb, ct) < 0)
479 goto nla_put_failure;
480
481 if (ctnetlink_dump_status(skb, ct) < 0)
482 goto nla_put_failure;
483
484 if (events & IPCT_DESTROY) {
485 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
486 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
487 goto nla_put_failure;
488 } else {
489 if (ctnetlink_dump_timeout(skb, ct) < 0)
490 goto nla_put_failure;
491
492 if (events & IPCT_PROTOINFO
493 && ctnetlink_dump_protoinfo(skb, ct) < 0)
494 goto nla_put_failure;
495
496 if ((events & IPCT_HELPER || nfct_help(ct))
497 && ctnetlink_dump_helpinfo(skb, ct) < 0)
498 goto nla_put_failure;
499
500 #ifdef CONFIG_NF_CONNTRACK_SECMARK
501 if ((events & IPCT_SECMARK || ct->secmark)
502 && ctnetlink_dump_secmark(skb, ct) < 0)
503 goto nla_put_failure;
504 #endif
505
506 if (events & IPCT_RELATED &&
507 ctnetlink_dump_master(skb, ct) < 0)
508 goto nla_put_failure;
509
510 if (events & IPCT_NATSEQADJ &&
511 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
512 goto nla_put_failure;
513 }
514
515 #ifdef CONFIG_NF_CONNTRACK_MARK
516 if ((events & IPCT_MARK || ct->mark)
517 && ctnetlink_dump_mark(skb, ct) < 0)
518 goto nla_put_failure;
519 #endif
520
521 nlh->nlmsg_len = skb->tail - b;
522 nfnetlink_send(skb, 0, group, 0);
523 return NOTIFY_DONE;
524
525 nlmsg_failure:
526 nla_put_failure:
527 kfree_skb(skb);
528 return NOTIFY_DONE;
529 }
530 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
531
532 static int ctnetlink_done(struct netlink_callback *cb)
533 {
534 if (cb->args[1])
535 nf_ct_put((struct nf_conn *)cb->args[1]);
536 return 0;
537 }
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 && nf_ct_l3num(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
577 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
578 IPCTNL_MSG_CT_GET_CTRZERO) {
579 struct nf_conn_counter *acct;
580
581 acct = nf_conn_acct_find(ct);
582 if (acct)
583 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
584 }
585 }
586 if (cb->args[1]) {
587 cb->args[1] = 0;
588 goto restart;
589 }
590 }
591 out:
592 rcu_read_unlock();
593 if (last)
594 nf_ct_put(last);
595
596 return skb->len;
597 }
598
599 static inline int
600 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
601 {
602 struct nlattr *tb[CTA_IP_MAX+1];
603 struct nf_conntrack_l3proto *l3proto;
604 int ret = 0;
605
606 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
607
608 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
609
610 if (likely(l3proto->nlattr_to_tuple)) {
611 ret = nla_validate_nested(attr, CTA_IP_MAX,
612 l3proto->nla_policy);
613 if (ret == 0)
614 ret = l3proto->nlattr_to_tuple(tb, tuple);
615 }
616
617 nf_ct_l3proto_put(l3proto);
618
619 return ret;
620 }
621
622 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
623 [CTA_PROTO_NUM] = { .type = NLA_U8 },
624 };
625
626 static inline int
627 ctnetlink_parse_tuple_proto(struct nlattr *attr,
628 struct nf_conntrack_tuple *tuple)
629 {
630 struct nlattr *tb[CTA_PROTO_MAX+1];
631 struct nf_conntrack_l4proto *l4proto;
632 int ret = 0;
633
634 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
635 if (ret < 0)
636 return ret;
637
638 if (!tb[CTA_PROTO_NUM])
639 return -EINVAL;
640 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
641
642 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
643
644 if (likely(l4proto->nlattr_to_tuple)) {
645 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
646 l4proto->nla_policy);
647 if (ret == 0)
648 ret = l4proto->nlattr_to_tuple(tb, tuple);
649 }
650
651 nf_ct_l4proto_put(l4proto);
652
653 return ret;
654 }
655
656 static int
657 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
658 enum ctattr_tuple type, u_int8_t l3num)
659 {
660 struct nlattr *tb[CTA_TUPLE_MAX+1];
661 int err;
662
663 memset(tuple, 0, sizeof(*tuple));
664
665 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
666
667 if (!tb[CTA_TUPLE_IP])
668 return -EINVAL;
669
670 tuple->src.l3num = l3num;
671
672 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
673 if (err < 0)
674 return err;
675
676 if (!tb[CTA_TUPLE_PROTO])
677 return -EINVAL;
678
679 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
680 if (err < 0)
681 return err;
682
683 /* orig and expect tuples get DIR_ORIGINAL */
684 if (type == CTA_TUPLE_REPLY)
685 tuple->dst.dir = IP_CT_DIR_REPLY;
686 else
687 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
688
689 return 0;
690 }
691
692 #ifdef CONFIG_NF_NAT_NEEDED
693 static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
694 [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 },
695 [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 },
696 };
697
698 static int nfnetlink_parse_nat_proto(struct nlattr *attr,
699 const struct nf_conn *ct,
700 struct nf_nat_range *range)
701 {
702 struct nlattr *tb[CTA_PROTONAT_MAX+1];
703 const struct nf_nat_protocol *npt;
704 int err;
705
706 err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
707 if (err < 0)
708 return err;
709
710 npt = nf_nat_proto_find_get(nf_ct_protonum(ct));
711 if (npt->nlattr_to_range)
712 err = npt->nlattr_to_range(tb, range);
713 nf_nat_proto_put(npt);
714 return err;
715 }
716
717 static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
718 [CTA_NAT_MINIP] = { .type = NLA_U32 },
719 [CTA_NAT_MAXIP] = { .type = NLA_U32 },
720 };
721
722 static inline int
723 nfnetlink_parse_nat(struct nlattr *nat,
724 const struct nf_conn *ct, struct nf_nat_range *range)
725 {
726 struct nlattr *tb[CTA_NAT_MAX+1];
727 int err;
728
729 memset(range, 0, sizeof(*range));
730
731 err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
732 if (err < 0)
733 return err;
734
735 if (tb[CTA_NAT_MINIP])
736 range->min_ip = nla_get_be32(tb[CTA_NAT_MINIP]);
737
738 if (!tb[CTA_NAT_MAXIP])
739 range->max_ip = range->min_ip;
740 else
741 range->max_ip = nla_get_be32(tb[CTA_NAT_MAXIP]);
742
743 if (range->min_ip)
744 range->flags |= IP_NAT_RANGE_MAP_IPS;
745
746 if (!tb[CTA_NAT_PROTO])
747 return 0;
748
749 err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
750 if (err < 0)
751 return err;
752
753 return 0;
754 }
755 #endif
756
757 static inline int
758 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
759 {
760 struct nlattr *tb[CTA_HELP_MAX+1];
761
762 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
763
764 if (!tb[CTA_HELP_NAME])
765 return -EINVAL;
766
767 *helper_name = nla_data(tb[CTA_HELP_NAME]);
768
769 return 0;
770 }
771
772 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
773 [CTA_STATUS] = { .type = NLA_U32 },
774 [CTA_TIMEOUT] = { .type = NLA_U32 },
775 [CTA_MARK] = { .type = NLA_U32 },
776 [CTA_USE] = { .type = NLA_U32 },
777 [CTA_ID] = { .type = NLA_U32 },
778 };
779
780 static int
781 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
782 struct nlmsghdr *nlh, struct nlattr *cda[])
783 {
784 struct nf_conntrack_tuple_hash *h;
785 struct nf_conntrack_tuple tuple;
786 struct nf_conn *ct;
787 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
788 u_int8_t u3 = nfmsg->nfgen_family;
789 int err = 0;
790
791 if (cda[CTA_TUPLE_ORIG])
792 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
793 else if (cda[CTA_TUPLE_REPLY])
794 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
795 else {
796 /* Flush the whole table */
797 nf_conntrack_flush();
798 return 0;
799 }
800
801 if (err < 0)
802 return err;
803
804 h = nf_conntrack_find_get(&tuple);
805 if (!h)
806 return -ENOENT;
807
808 ct = nf_ct_tuplehash_to_ctrack(h);
809
810 if (cda[CTA_ID]) {
811 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
812 if (id != (u32)(unsigned long)ct) {
813 nf_ct_put(ct);
814 return -ENOENT;
815 }
816 }
817
818 nf_ct_kill(ct);
819 nf_ct_put(ct);
820
821 return 0;
822 }
823
824 static int
825 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
826 struct nlmsghdr *nlh, struct nlattr *cda[])
827 {
828 struct nf_conntrack_tuple_hash *h;
829 struct nf_conntrack_tuple tuple;
830 struct nf_conn *ct;
831 struct sk_buff *skb2 = NULL;
832 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
833 u_int8_t u3 = nfmsg->nfgen_family;
834 int err = 0;
835
836 if (nlh->nlmsg_flags & NLM_F_DUMP)
837 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
838 ctnetlink_done);
839
840 if (cda[CTA_TUPLE_ORIG])
841 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
842 else if (cda[CTA_TUPLE_REPLY])
843 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
844 else
845 return -EINVAL;
846
847 if (err < 0)
848 return err;
849
850 h = nf_conntrack_find_get(&tuple);
851 if (!h)
852 return -ENOENT;
853
854 ct = nf_ct_tuplehash_to_ctrack(h);
855
856 err = -ENOMEM;
857 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
858 if (!skb2) {
859 nf_ct_put(ct);
860 return -ENOMEM;
861 }
862
863 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
864 IPCTNL_MSG_CT_NEW, 1, ct);
865 nf_ct_put(ct);
866 if (err <= 0)
867 goto free;
868
869 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
870 if (err < 0)
871 goto out;
872
873 return 0;
874
875 free:
876 kfree_skb(skb2);
877 out:
878 return err;
879 }
880
881 static int
882 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
883 {
884 unsigned long d;
885 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
886 d = ct->status ^ status;
887
888 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
889 /* unchangeable */
890 return -EBUSY;
891
892 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
893 /* SEEN_REPLY bit can only be set */
894 return -EBUSY;
895
896 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
897 /* ASSURED bit can only be set */
898 return -EBUSY;
899
900 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
901 #ifndef CONFIG_NF_NAT_NEEDED
902 return -EOPNOTSUPP;
903 #else
904 struct nf_nat_range range;
905
906 if (cda[CTA_NAT_DST]) {
907 if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
908 &range) < 0)
909 return -EINVAL;
910 if (nf_nat_initialized(ct, IP_NAT_MANIP_DST))
911 return -EEXIST;
912 nf_nat_setup_info(ct, &range, IP_NAT_MANIP_DST);
913 }
914 if (cda[CTA_NAT_SRC]) {
915 if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
916 &range) < 0)
917 return -EINVAL;
918 if (nf_nat_initialized(ct, IP_NAT_MANIP_SRC))
919 return -EEXIST;
920 nf_nat_setup_info(ct, &range, IP_NAT_MANIP_SRC);
921 }
922 #endif
923 }
924
925 /* Be careful here, modifying NAT bits can screw up things,
926 * so don't let users modify them directly if they don't pass
927 * nf_nat_range. */
928 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
929 return 0;
930 }
931
932
933 static inline int
934 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
935 {
936 struct nf_conntrack_helper *helper;
937 struct nf_conn_help *help = nfct_help(ct);
938 char *helpname;
939 int err;
940
941 /* don't change helper of sibling connections */
942 if (ct->master)
943 return -EBUSY;
944
945 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
946 if (err < 0)
947 return err;
948
949 if (!strcmp(helpname, "")) {
950 if (help && help->helper) {
951 /* we had a helper before ... */
952 nf_ct_remove_expectations(ct);
953 rcu_assign_pointer(help->helper, NULL);
954 }
955
956 return 0;
957 }
958
959 helper = __nf_conntrack_helper_find_byname(helpname);
960 if (helper == NULL)
961 return -EOPNOTSUPP;
962
963 if (help) {
964 if (help->helper == helper)
965 return 0;
966 if (help->helper)
967 return -EBUSY;
968 /* need to zero data of old helper */
969 memset(&help->help, 0, sizeof(help->help));
970 } else {
971 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
972 if (help == NULL)
973 return -ENOMEM;
974 }
975
976 rcu_assign_pointer(help->helper, helper);
977
978 return 0;
979 }
980
981 static inline int
982 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
983 {
984 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
985
986 if (!del_timer(&ct->timeout))
987 return -ETIME;
988
989 ct->timeout.expires = jiffies + timeout * HZ;
990 add_timer(&ct->timeout);
991
992 return 0;
993 }
994
995 static inline int
996 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
997 {
998 struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
999 struct nf_conntrack_l4proto *l4proto;
1000 int err = 0;
1001
1002 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1003
1004 l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
1005 if (l4proto->from_nlattr)
1006 err = l4proto->from_nlattr(tb, ct);
1007 nf_ct_l4proto_put(l4proto);
1008
1009 return err;
1010 }
1011
1012 #ifdef CONFIG_NF_NAT_NEEDED
1013 static inline int
1014 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1015 {
1016 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1017
1018 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1019
1020 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1021 return -EINVAL;
1022
1023 natseq->correction_pos =
1024 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1025
1026 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1027 return -EINVAL;
1028
1029 natseq->offset_before =
1030 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1031
1032 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1033 return -EINVAL;
1034
1035 natseq->offset_after =
1036 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1037
1038 return 0;
1039 }
1040
1041 static int
1042 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1043 {
1044 int ret = 0;
1045 struct nf_conn_nat *nat = nfct_nat(ct);
1046
1047 if (!nat)
1048 return 0;
1049
1050 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1051 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1052 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1053 if (ret < 0)
1054 return ret;
1055
1056 ct->status |= IPS_SEQ_ADJUST;
1057 }
1058
1059 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1060 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1061 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1062 if (ret < 0)
1063 return ret;
1064
1065 ct->status |= IPS_SEQ_ADJUST;
1066 }
1067
1068 return 0;
1069 }
1070 #endif
1071
1072 static int
1073 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1074 {
1075 int err;
1076
1077 if (cda[CTA_HELP]) {
1078 err = ctnetlink_change_helper(ct, cda);
1079 if (err < 0)
1080 return err;
1081 }
1082
1083 if (cda[CTA_TIMEOUT]) {
1084 err = ctnetlink_change_timeout(ct, cda);
1085 if (err < 0)
1086 return err;
1087 }
1088
1089 if (cda[CTA_STATUS]) {
1090 err = ctnetlink_change_status(ct, cda);
1091 if (err < 0)
1092 return err;
1093 }
1094
1095 if (cda[CTA_PROTOINFO]) {
1096 err = ctnetlink_change_protoinfo(ct, cda);
1097 if (err < 0)
1098 return err;
1099 }
1100
1101 #if defined(CONFIG_NF_CONNTRACK_MARK)
1102 if (cda[CTA_MARK])
1103 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1104 #endif
1105
1106 #ifdef CONFIG_NF_NAT_NEEDED
1107 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1108 err = ctnetlink_change_nat_seq_adj(ct, cda);
1109 if (err < 0)
1110 return err;
1111 }
1112 #endif
1113
1114 return 0;
1115 }
1116
1117 static int
1118 ctnetlink_create_conntrack(struct nlattr *cda[],
1119 struct nf_conntrack_tuple *otuple,
1120 struct nf_conntrack_tuple *rtuple,
1121 struct nf_conn *master_ct)
1122 {
1123 struct nf_conn *ct;
1124 int err = -EINVAL;
1125 struct nf_conn_help *help;
1126 struct nf_conntrack_helper *helper;
1127
1128 ct = nf_conntrack_alloc(otuple, rtuple, GFP_KERNEL);
1129 if (ct == NULL || IS_ERR(ct))
1130 return -ENOMEM;
1131
1132 if (!cda[CTA_TIMEOUT])
1133 goto err;
1134 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1135
1136 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1137 ct->status |= IPS_CONFIRMED;
1138
1139 rcu_read_lock();
1140 helper = __nf_ct_helper_find(rtuple);
1141 if (helper) {
1142 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1143 if (help == NULL) {
1144 rcu_read_unlock();
1145 err = -ENOMEM;
1146 goto err;
1147 }
1148 /* not in hash table yet so not strictly necessary */
1149 rcu_assign_pointer(help->helper, helper);
1150 }
1151
1152 if (cda[CTA_STATUS]) {
1153 err = ctnetlink_change_status(ct, cda);
1154 if (err < 0) {
1155 rcu_read_unlock();
1156 goto err;
1157 }
1158 }
1159
1160 if (cda[CTA_PROTOINFO]) {
1161 err = ctnetlink_change_protoinfo(ct, cda);
1162 if (err < 0) {
1163 rcu_read_unlock();
1164 goto err;
1165 }
1166 }
1167
1168 nf_ct_acct_ext_add(ct, GFP_KERNEL);
1169
1170 #if defined(CONFIG_NF_CONNTRACK_MARK)
1171 if (cda[CTA_MARK])
1172 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1173 #endif
1174
1175 /* setup master conntrack: this is a confirmed expectation */
1176 if (master_ct) {
1177 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1178 ct->master = master_ct;
1179 }
1180
1181 add_timer(&ct->timeout);
1182 nf_conntrack_hash_insert(ct);
1183 rcu_read_unlock();
1184
1185 return 0;
1186
1187 err:
1188 nf_conntrack_free(ct);
1189 return err;
1190 }
1191
1192 static int
1193 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1194 struct nlmsghdr *nlh, struct nlattr *cda[])
1195 {
1196 struct nf_conntrack_tuple otuple, rtuple;
1197 struct nf_conntrack_tuple_hash *h = NULL;
1198 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1199 u_int8_t u3 = nfmsg->nfgen_family;
1200 int err = 0;
1201
1202 if (cda[CTA_TUPLE_ORIG]) {
1203 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1204 if (err < 0)
1205 return err;
1206 }
1207
1208 if (cda[CTA_TUPLE_REPLY]) {
1209 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1210 if (err < 0)
1211 return err;
1212 }
1213
1214 spin_lock_bh(&nf_conntrack_lock);
1215 if (cda[CTA_TUPLE_ORIG])
1216 h = __nf_conntrack_find(&otuple);
1217 else if (cda[CTA_TUPLE_REPLY])
1218 h = __nf_conntrack_find(&rtuple);
1219
1220 if (h == NULL) {
1221 struct nf_conntrack_tuple master;
1222 struct nf_conntrack_tuple_hash *master_h = NULL;
1223 struct nf_conn *master_ct = NULL;
1224
1225 if (cda[CTA_TUPLE_MASTER]) {
1226 err = ctnetlink_parse_tuple(cda,
1227 &master,
1228 CTA_TUPLE_MASTER,
1229 u3);
1230 if (err < 0)
1231 goto out_unlock;
1232
1233 master_h = __nf_conntrack_find(&master);
1234 if (master_h == NULL) {
1235 err = -ENOENT;
1236 goto out_unlock;
1237 }
1238 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1239 atomic_inc(&master_ct->ct_general.use);
1240 }
1241
1242 spin_unlock_bh(&nf_conntrack_lock);
1243 err = -ENOENT;
1244 if (nlh->nlmsg_flags & NLM_F_CREATE)
1245 err = ctnetlink_create_conntrack(cda,
1246 &otuple,
1247 &rtuple,
1248 master_ct);
1249 if (err < 0 && master_ct)
1250 nf_ct_put(master_ct);
1251
1252 return err;
1253 }
1254 /* implicit 'else' */
1255
1256 /* We manipulate the conntrack inside the global conntrack table lock,
1257 * so there's no need to increase the refcount */
1258 err = -EEXIST;
1259 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1260 /* we only allow nat config for new conntracks */
1261 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1262 err = -EOPNOTSUPP;
1263 goto out_unlock;
1264 }
1265 /* can't link an existing conntrack to a master */
1266 if (cda[CTA_TUPLE_MASTER]) {
1267 err = -EOPNOTSUPP;
1268 goto out_unlock;
1269 }
1270 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1271 cda);
1272 }
1273
1274 out_unlock:
1275 spin_unlock_bh(&nf_conntrack_lock);
1276 return err;
1277 }
1278
1279 /***********************************************************************
1280 * EXPECT
1281 ***********************************************************************/
1282
1283 static inline int
1284 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1285 const struct nf_conntrack_tuple *tuple,
1286 enum ctattr_expect type)
1287 {
1288 struct nlattr *nest_parms;
1289
1290 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1291 if (!nest_parms)
1292 goto nla_put_failure;
1293 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1294 goto nla_put_failure;
1295 nla_nest_end(skb, nest_parms);
1296
1297 return 0;
1298
1299 nla_put_failure:
1300 return -1;
1301 }
1302
1303 static inline int
1304 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1305 const struct nf_conntrack_tuple *tuple,
1306 const struct nf_conntrack_tuple_mask *mask)
1307 {
1308 int ret;
1309 struct nf_conntrack_l3proto *l3proto;
1310 struct nf_conntrack_l4proto *l4proto;
1311 struct nf_conntrack_tuple m;
1312 struct nlattr *nest_parms;
1313
1314 memset(&m, 0xFF, sizeof(m));
1315 m.src.u.all = mask->src.u.all;
1316 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1317
1318 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1319 if (!nest_parms)
1320 goto nla_put_failure;
1321
1322 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1323 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1324 nf_ct_l3proto_put(l3proto);
1325
1326 if (unlikely(ret < 0))
1327 goto nla_put_failure;
1328
1329 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1330 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1331 nf_ct_l4proto_put(l4proto);
1332 if (unlikely(ret < 0))
1333 goto nla_put_failure;
1334
1335 nla_nest_end(skb, nest_parms);
1336
1337 return 0;
1338
1339 nla_put_failure:
1340 return -1;
1341 }
1342
1343 static int
1344 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1345 const struct nf_conntrack_expect *exp)
1346 {
1347 struct nf_conn *master = exp->master;
1348 long timeout = (exp->timeout.expires - jiffies) / HZ;
1349
1350 if (timeout < 0)
1351 timeout = 0;
1352
1353 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1354 goto nla_put_failure;
1355 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1356 goto nla_put_failure;
1357 if (ctnetlink_exp_dump_tuple(skb,
1358 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1359 CTA_EXPECT_MASTER) < 0)
1360 goto nla_put_failure;
1361
1362 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1363 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1364
1365 return 0;
1366
1367 nla_put_failure:
1368 return -1;
1369 }
1370
1371 static int
1372 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1373 int event,
1374 int nowait,
1375 const struct nf_conntrack_expect *exp)
1376 {
1377 struct nlmsghdr *nlh;
1378 struct nfgenmsg *nfmsg;
1379 unsigned char *b = skb_tail_pointer(skb);
1380
1381 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1382 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1383 nfmsg = NLMSG_DATA(nlh);
1384
1385 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1386 nfmsg->nfgen_family = exp->tuple.src.l3num;
1387 nfmsg->version = NFNETLINK_V0;
1388 nfmsg->res_id = 0;
1389
1390 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1391 goto nla_put_failure;
1392
1393 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1394 return skb->len;
1395
1396 nlmsg_failure:
1397 nla_put_failure:
1398 nlmsg_trim(skb, b);
1399 return -1;
1400 }
1401
1402 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1403 static int ctnetlink_expect_event(struct notifier_block *this,
1404 unsigned long events, void *ptr)
1405 {
1406 struct nlmsghdr *nlh;
1407 struct nfgenmsg *nfmsg;
1408 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1409 struct sk_buff *skb;
1410 unsigned int type;
1411 sk_buff_data_t b;
1412 int flags = 0;
1413
1414 if (events & IPEXP_NEW) {
1415 type = IPCTNL_MSG_EXP_NEW;
1416 flags = NLM_F_CREATE|NLM_F_EXCL;
1417 } else
1418 return NOTIFY_DONE;
1419
1420 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1421 return NOTIFY_DONE;
1422
1423 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1424 if (!skb)
1425 return NOTIFY_DONE;
1426
1427 b = skb->tail;
1428
1429 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1430 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1431 nfmsg = NLMSG_DATA(nlh);
1432
1433 nlh->nlmsg_flags = flags;
1434 nfmsg->nfgen_family = exp->tuple.src.l3num;
1435 nfmsg->version = NFNETLINK_V0;
1436 nfmsg->res_id = 0;
1437
1438 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1439 goto nla_put_failure;
1440
1441 nlh->nlmsg_len = skb->tail - b;
1442 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1443 return NOTIFY_DONE;
1444
1445 nlmsg_failure:
1446 nla_put_failure:
1447 kfree_skb(skb);
1448 return NOTIFY_DONE;
1449 }
1450 #endif
1451 static int ctnetlink_exp_done(struct netlink_callback *cb)
1452 {
1453 if (cb->args[1])
1454 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1455 return 0;
1456 }
1457
1458 static int
1459 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1460 {
1461 struct nf_conntrack_expect *exp, *last;
1462 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1463 struct hlist_node *n;
1464 u_int8_t l3proto = nfmsg->nfgen_family;
1465
1466 rcu_read_lock();
1467 last = (struct nf_conntrack_expect *)cb->args[1];
1468 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1469 restart:
1470 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1471 hnode) {
1472 if (l3proto && exp->tuple.src.l3num != l3proto)
1473 continue;
1474 if (cb->args[1]) {
1475 if (exp != last)
1476 continue;
1477 cb->args[1] = 0;
1478 }
1479 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1480 cb->nlh->nlmsg_seq,
1481 IPCTNL_MSG_EXP_NEW,
1482 1, exp) < 0) {
1483 if (!atomic_inc_not_zero(&exp->use))
1484 continue;
1485 cb->args[1] = (unsigned long)exp;
1486 goto out;
1487 }
1488 }
1489 if (cb->args[1]) {
1490 cb->args[1] = 0;
1491 goto restart;
1492 }
1493 }
1494 out:
1495 rcu_read_unlock();
1496 if (last)
1497 nf_ct_expect_put(last);
1498
1499 return skb->len;
1500 }
1501
1502 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1503 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1504 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1505 };
1506
1507 static int
1508 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1509 struct nlmsghdr *nlh, struct nlattr *cda[])
1510 {
1511 struct nf_conntrack_tuple tuple;
1512 struct nf_conntrack_expect *exp;
1513 struct sk_buff *skb2;
1514 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1515 u_int8_t u3 = nfmsg->nfgen_family;
1516 int err = 0;
1517
1518 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1519 return netlink_dump_start(ctnl, skb, nlh,
1520 ctnetlink_exp_dump_table,
1521 ctnetlink_exp_done);
1522 }
1523
1524 if (cda[CTA_EXPECT_MASTER])
1525 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1526 else
1527 return -EINVAL;
1528
1529 if (err < 0)
1530 return err;
1531
1532 exp = nf_ct_expect_find_get(&tuple);
1533 if (!exp)
1534 return -ENOENT;
1535
1536 if (cda[CTA_EXPECT_ID]) {
1537 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1538 if (ntohl(id) != (u32)(unsigned long)exp) {
1539 nf_ct_expect_put(exp);
1540 return -ENOENT;
1541 }
1542 }
1543
1544 err = -ENOMEM;
1545 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1546 if (!skb2)
1547 goto out;
1548
1549 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1550 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1551 1, exp);
1552 if (err <= 0)
1553 goto free;
1554
1555 nf_ct_expect_put(exp);
1556
1557 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1558
1559 free:
1560 kfree_skb(skb2);
1561 out:
1562 nf_ct_expect_put(exp);
1563 return err;
1564 }
1565
1566 static int
1567 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1568 struct nlmsghdr *nlh, struct nlattr *cda[])
1569 {
1570 struct nf_conntrack_expect *exp;
1571 struct nf_conntrack_tuple tuple;
1572 struct nf_conntrack_helper *h;
1573 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1574 struct hlist_node *n, *next;
1575 u_int8_t u3 = nfmsg->nfgen_family;
1576 unsigned int i;
1577 int err;
1578
1579 if (cda[CTA_EXPECT_TUPLE]) {
1580 /* delete a single expect by tuple */
1581 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1582 if (err < 0)
1583 return err;
1584
1585 /* bump usage count to 2 */
1586 exp = nf_ct_expect_find_get(&tuple);
1587 if (!exp)
1588 return -ENOENT;
1589
1590 if (cda[CTA_EXPECT_ID]) {
1591 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1592 if (ntohl(id) != (u32)(unsigned long)exp) {
1593 nf_ct_expect_put(exp);
1594 return -ENOENT;
1595 }
1596 }
1597
1598 /* after list removal, usage count == 1 */
1599 nf_ct_unexpect_related(exp);
1600 /* have to put what we 'get' above.
1601 * after this line usage count == 0 */
1602 nf_ct_expect_put(exp);
1603 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1604 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1605 struct nf_conn_help *m_help;
1606
1607 /* delete all expectations for this helper */
1608 spin_lock_bh(&nf_conntrack_lock);
1609 h = __nf_conntrack_helper_find_byname(name);
1610 if (!h) {
1611 spin_unlock_bh(&nf_conntrack_lock);
1612 return -EOPNOTSUPP;
1613 }
1614 for (i = 0; i < nf_ct_expect_hsize; i++) {
1615 hlist_for_each_entry_safe(exp, n, next,
1616 &nf_ct_expect_hash[i],
1617 hnode) {
1618 m_help = nfct_help(exp->master);
1619 if (m_help->helper == h
1620 && del_timer(&exp->timeout)) {
1621 nf_ct_unlink_expect(exp);
1622 nf_ct_expect_put(exp);
1623 }
1624 }
1625 }
1626 spin_unlock_bh(&nf_conntrack_lock);
1627 } else {
1628 /* This basically means we have to flush everything*/
1629 spin_lock_bh(&nf_conntrack_lock);
1630 for (i = 0; i < nf_ct_expect_hsize; i++) {
1631 hlist_for_each_entry_safe(exp, n, next,
1632 &nf_ct_expect_hash[i],
1633 hnode) {
1634 if (del_timer(&exp->timeout)) {
1635 nf_ct_unlink_expect(exp);
1636 nf_ct_expect_put(exp);
1637 }
1638 }
1639 }
1640 spin_unlock_bh(&nf_conntrack_lock);
1641 }
1642
1643 return 0;
1644 }
1645 static int
1646 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1647 {
1648 return -EOPNOTSUPP;
1649 }
1650
1651 static int
1652 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1653 {
1654 struct nf_conntrack_tuple tuple, mask, master_tuple;
1655 struct nf_conntrack_tuple_hash *h = NULL;
1656 struct nf_conntrack_expect *exp;
1657 struct nf_conn *ct;
1658 struct nf_conn_help *help;
1659 int err = 0;
1660
1661 /* caller guarantees that those three CTA_EXPECT_* exist */
1662 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1663 if (err < 0)
1664 return err;
1665 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1666 if (err < 0)
1667 return err;
1668 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1669 if (err < 0)
1670 return err;
1671
1672 /* Look for master conntrack of this expectation */
1673 h = nf_conntrack_find_get(&master_tuple);
1674 if (!h)
1675 return -ENOENT;
1676 ct = nf_ct_tuplehash_to_ctrack(h);
1677 help = nfct_help(ct);
1678
1679 if (!help || !help->helper) {
1680 /* such conntrack hasn't got any helper, abort */
1681 err = -EINVAL;
1682 goto out;
1683 }
1684
1685 exp = nf_ct_expect_alloc(ct);
1686 if (!exp) {
1687 err = -ENOMEM;
1688 goto out;
1689 }
1690
1691 exp->expectfn = NULL;
1692 exp->flags = 0;
1693 exp->master = ct;
1694 exp->helper = NULL;
1695 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1696 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1697 exp->mask.src.u.all = mask.src.u.all;
1698
1699 err = nf_ct_expect_related(exp);
1700 nf_ct_expect_put(exp);
1701
1702 out:
1703 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1704 return err;
1705 }
1706
1707 static int
1708 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1709 struct nlmsghdr *nlh, struct nlattr *cda[])
1710 {
1711 struct nf_conntrack_tuple tuple;
1712 struct nf_conntrack_expect *exp;
1713 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1714 u_int8_t u3 = nfmsg->nfgen_family;
1715 int err = 0;
1716
1717 if (!cda[CTA_EXPECT_TUPLE]
1718 || !cda[CTA_EXPECT_MASK]
1719 || !cda[CTA_EXPECT_MASTER])
1720 return -EINVAL;
1721
1722 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1723 if (err < 0)
1724 return err;
1725
1726 spin_lock_bh(&nf_conntrack_lock);
1727 exp = __nf_ct_expect_find(&tuple);
1728
1729 if (!exp) {
1730 spin_unlock_bh(&nf_conntrack_lock);
1731 err = -ENOENT;
1732 if (nlh->nlmsg_flags & NLM_F_CREATE)
1733 err = ctnetlink_create_expect(cda, u3);
1734 return err;
1735 }
1736
1737 err = -EEXIST;
1738 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1739 err = ctnetlink_change_expect(exp, cda);
1740 spin_unlock_bh(&nf_conntrack_lock);
1741
1742 return err;
1743 }
1744
1745 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1746 static struct notifier_block ctnl_notifier = {
1747 .notifier_call = ctnetlink_conntrack_event,
1748 };
1749
1750 static struct notifier_block ctnl_notifier_exp = {
1751 .notifier_call = ctnetlink_expect_event,
1752 };
1753 #endif
1754
1755 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1756 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1757 .attr_count = CTA_MAX,
1758 .policy = ct_nla_policy },
1759 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1760 .attr_count = CTA_MAX,
1761 .policy = ct_nla_policy },
1762 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1763 .attr_count = CTA_MAX,
1764 .policy = ct_nla_policy },
1765 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1766 .attr_count = CTA_MAX,
1767 .policy = ct_nla_policy },
1768 };
1769
1770 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1771 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1772 .attr_count = CTA_EXPECT_MAX,
1773 .policy = exp_nla_policy },
1774 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1775 .attr_count = CTA_EXPECT_MAX,
1776 .policy = exp_nla_policy },
1777 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1778 .attr_count = CTA_EXPECT_MAX,
1779 .policy = exp_nla_policy },
1780 };
1781
1782 static const struct nfnetlink_subsystem ctnl_subsys = {
1783 .name = "conntrack",
1784 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1785 .cb_count = IPCTNL_MSG_MAX,
1786 .cb = ctnl_cb,
1787 };
1788
1789 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1790 .name = "conntrack_expect",
1791 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1792 .cb_count = IPCTNL_MSG_EXP_MAX,
1793 .cb = ctnl_exp_cb,
1794 };
1795
1796 MODULE_ALIAS("ip_conntrack_netlink");
1797 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1798 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1799
1800 static int __init ctnetlink_init(void)
1801 {
1802 int ret;
1803
1804 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1805 ret = nfnetlink_subsys_register(&ctnl_subsys);
1806 if (ret < 0) {
1807 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1808 goto err_out;
1809 }
1810
1811 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1812 if (ret < 0) {
1813 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1814 goto err_unreg_subsys;
1815 }
1816
1817 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1818 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1819 if (ret < 0) {
1820 printk("ctnetlink_init: cannot register notifier.\n");
1821 goto err_unreg_exp_subsys;
1822 }
1823
1824 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1825 if (ret < 0) {
1826 printk("ctnetlink_init: cannot expect register notifier.\n");
1827 goto err_unreg_notifier;
1828 }
1829 #endif
1830
1831 return 0;
1832
1833 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1834 err_unreg_notifier:
1835 nf_conntrack_unregister_notifier(&ctnl_notifier);
1836 err_unreg_exp_subsys:
1837 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1838 #endif
1839 err_unreg_subsys:
1840 nfnetlink_subsys_unregister(&ctnl_subsys);
1841 err_out:
1842 return ret;
1843 }
1844
1845 static void __exit ctnetlink_exit(void)
1846 {
1847 printk("ctnetlink: unregistering from nfnetlink.\n");
1848
1849 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1850 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1851 nf_conntrack_unregister_notifier(&ctnl_notifier);
1852 #endif
1853
1854 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1855 nfnetlink_subsys_unregister(&ctnl_subsys);
1856 return;
1857 }
1858
1859 module_init(ctnetlink_init);
1860 module_exit(ctnetlink_exit);
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