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Char: mxser, simplify mxser_get_serial_info
[wrt350n-kernel.git] / net / netfilter / nf_conntrack_netlink.c
blob4a1b42b2b7a5bc55b7f4cdce9000a968caef2562
1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2007 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/types.h>
22 #include <linux/timer.h>
23 #include <linux/skbuff.h>
24 #include <linux/errno.h>
25 #include <linux/netlink.h>
26 #include <linux/spinlock.h>
27 #include <linux/interrupt.h>
28 #include <linux/notifier.h>
29
30 #include <linux/netfilter.h>
31 #include <net/netlink.h>
32 #include <net/netfilter/nf_conntrack.h>
33 #include <net/netfilter/nf_conntrack_core.h>
34 #include <net/netfilter/nf_conntrack_expect.h>
35 #include <net/netfilter/nf_conntrack_helper.h>
36 #include <net/netfilter/nf_conntrack_l3proto.h>
37 #include <net/netfilter/nf_conntrack_l4proto.h>
38 #include <net/netfilter/nf_conntrack_tuple.h>
39 #ifdef CONFIG_NF_NAT_NEEDED
40 #include <net/netfilter/nf_nat_core.h>
41 #include <net/netfilter/nf_nat_protocol.h>
42 #endif
43
44 #include <linux/netfilter/nfnetlink.h>
45 #include <linux/netfilter/nfnetlink_conntrack.h>
46
47 MODULE_LICENSE("GPL");
48
49 static char __initdata version[] = "0.93";
50
51 static inline int
52 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
53 const struct nf_conntrack_tuple *tuple,
54 struct nf_conntrack_l4proto *l4proto)
55 {
56 int ret = 0;
57 struct nlattr *nest_parms;
58
59 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
60 if (!nest_parms)
61 goto nla_put_failure;
62 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
63
64 if (likely(l4proto->tuple_to_nlattr))
65 ret = l4proto->tuple_to_nlattr(skb, tuple);
66
67 nla_nest_end(skb, nest_parms);
68
69 return ret;
70
71 nla_put_failure:
72 return -1;
73 }
74
75 static inline int
76 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
77 const struct nf_conntrack_tuple *tuple,
78 struct nf_conntrack_l3proto *l3proto)
79 {
80 int ret = 0;
81 struct nlattr *nest_parms;
82
83 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
84 if (!nest_parms)
85 goto nla_put_failure;
86
87 if (likely(l3proto->tuple_to_nlattr))
88 ret = l3proto->tuple_to_nlattr(skb, tuple);
89
90 nla_nest_end(skb, nest_parms);
91
92 return ret;
93
94 nla_put_failure:
95 return -1;
96 }
97
98 static int
99 ctnetlink_dump_tuples(struct sk_buff *skb,
100 const struct nf_conntrack_tuple *tuple)
101 {
102 int ret;
103 struct nf_conntrack_l3proto *l3proto;
104 struct nf_conntrack_l4proto *l4proto;
105
106 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
107 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
108 nf_ct_l3proto_put(l3proto);
109
110 if (unlikely(ret < 0))
111 return ret;
112
113 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
114 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
115 nf_ct_l4proto_put(l4proto);
116
117 return ret;
118 }
119
120 static inline int
121 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
122 {
123 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
124 return 0;
125
126 nla_put_failure:
127 return -1;
128 }
129
130 static inline int
131 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
132 {
133 long timeout = (ct->timeout.expires - jiffies) / HZ;
134
135 if (timeout < 0)
136 timeout = 0;
137
138 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
139 return 0;
140
141 nla_put_failure:
142 return -1;
143 }
144
145 static inline int
146 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
147 {
148 struct nf_conntrack_l4proto *l4proto = nf_ct_l4proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
149 struct nlattr *nest_proto;
150 int ret;
151
152 if (!l4proto->to_nlattr) {
153 nf_ct_l4proto_put(l4proto);
154 return 0;
155 }
156
157 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
158 if (!nest_proto)
159 goto nla_put_failure;
160
161 ret = l4proto->to_nlattr(skb, nest_proto, ct);
162
163 nf_ct_l4proto_put(l4proto);
164
165 nla_nest_end(skb, nest_proto);
166
167 return ret;
168
169 nla_put_failure:
170 nf_ct_l4proto_put(l4proto);
171 return -1;
172 }
173
174 static inline int
175 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
176 {
177 struct nlattr *nest_helper;
178 const struct nf_conn_help *help = nfct_help(ct);
179 struct nf_conntrack_helper *helper;
180
181 if (!help)
182 return 0;
183
184 rcu_read_lock();
185 helper = rcu_dereference(help->helper);
186 if (!helper)
187 goto out;
188
189 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
190 if (!nest_helper)
191 goto nla_put_failure;
192 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
193
194 if (helper->to_nlattr)
195 helper->to_nlattr(skb, ct);
196
197 nla_nest_end(skb, nest_helper);
198 out:
199 rcu_read_unlock();
200 return 0;
201
202 nla_put_failure:
203 rcu_read_unlock();
204 return -1;
205 }
206
207 #ifdef CONFIG_NF_CT_ACCT
208 static int
209 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
210 enum ip_conntrack_dir dir)
211 {
212 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
213 struct nlattr *nest_count;
214
215 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
216 if (!nest_count)
217 goto nla_put_failure;
218
219 NLA_PUT_BE32(skb, CTA_COUNTERS32_PACKETS,
220 htonl(ct->counters[dir].packets));
221 NLA_PUT_BE32(skb, CTA_COUNTERS32_BYTES,
222 htonl(ct->counters[dir].bytes));
223
224 nla_nest_end(skb, nest_count);
225
226 return 0;
227
228 nla_put_failure:
229 return -1;
230 }
231 #else
232 #define ctnetlink_dump_counters(a, b, c) (0)
233 #endif
234
235 #ifdef CONFIG_NF_CONNTRACK_MARK
236 static inline int
237 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
238 {
239 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
240 return 0;
241
242 nla_put_failure:
243 return -1;
244 }
245 #else
246 #define ctnetlink_dump_mark(a, b) (0)
247 #endif
248
249 #ifdef CONFIG_NF_CONNTRACK_SECMARK
250 static inline int
251 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
252 {
253 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
254 return 0;
255
256 nla_put_failure:
257 return -1;
258 }
259 #else
260 #define ctnetlink_dump_secmark(a, b) (0)
261 #endif
262
263 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
264
265 static inline int
266 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
267 {
268 struct nlattr *nest_parms;
269
270 if (!(ct->status & IPS_EXPECTED))
271 return 0;
272
273 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
274 if (!nest_parms)
275 goto nla_put_failure;
276 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
277 goto nla_put_failure;
278 nla_nest_end(skb, nest_parms);
279
280 return 0;
281
282 nla_put_failure:
283 return -1;
284 }
285
286 #ifdef CONFIG_NF_NAT_NEEDED
287 static int
288 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
289 {
290 struct nlattr *nest_parms;
291
292 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
293 if (!nest_parms)
294 goto nla_put_failure;
295
296 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
297 htonl(natseq->correction_pos));
298 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
299 htonl(natseq->offset_before));
300 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
301 htonl(natseq->offset_after));
302
303 nla_nest_end(skb, nest_parms);
304
305 return 0;
306
307 nla_put_failure:
308 return -1;
309 }
310
311 static inline int
312 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
313 {
314 struct nf_nat_seq *natseq;
315 struct nf_conn_nat *nat = nfct_nat(ct);
316
317 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
318 return 0;
319
320 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
321 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
322 return -1;
323
324 natseq = &nat->seq[IP_CT_DIR_REPLY];
325 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
326 return -1;
327
328 return 0;
329 }
330 #else
331 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
332 #endif
333
334 static inline int
335 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
336 {
337 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
338 return 0;
339
340 nla_put_failure:
341 return -1;
342 }
343
344 static inline int
345 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
346 {
347 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
348 return 0;
349
350 nla_put_failure:
351 return -1;
352 }
353
354 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
355
356 static int
357 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
358 int event, int nowait,
359 const struct nf_conn *ct)
360 {
361 struct nlmsghdr *nlh;
362 struct nfgenmsg *nfmsg;
363 struct nlattr *nest_parms;
364 unsigned char *b = skb_tail_pointer(skb);
365
366 event |= NFNL_SUBSYS_CTNETLINK << 8;
367 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
368 nfmsg = NLMSG_DATA(nlh);
369
370 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
371 nfmsg->nfgen_family =
372 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
373 nfmsg->version = NFNETLINK_V0;
374 nfmsg->res_id = 0;
375
376 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
377 if (!nest_parms)
378 goto nla_put_failure;
379 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
380 goto nla_put_failure;
381 nla_nest_end(skb, nest_parms);
382
383 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
384 if (!nest_parms)
385 goto nla_put_failure;
386 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
387 goto nla_put_failure;
388 nla_nest_end(skb, nest_parms);
389
390 if (ctnetlink_dump_status(skb, ct) < 0 ||
391 ctnetlink_dump_timeout(skb, ct) < 0 ||
392 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
393 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
394 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
395 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
396 ctnetlink_dump_mark(skb, ct) < 0 ||
397 ctnetlink_dump_secmark(skb, ct) < 0 ||
398 ctnetlink_dump_id(skb, ct) < 0 ||
399 ctnetlink_dump_use(skb, ct) < 0 ||
400 ctnetlink_dump_master(skb, ct) < 0 ||
401 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
402 goto nla_put_failure;
403
404 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
405 return skb->len;
406
407 nlmsg_failure:
408 nla_put_failure:
409 nlmsg_trim(skb, b);
410 return -1;
411 }
412
413 #ifdef CONFIG_NF_CONNTRACK_EVENTS
414 static int ctnetlink_conntrack_event(struct notifier_block *this,
415 unsigned long events, void *ptr)
416 {
417 struct nlmsghdr *nlh;
418 struct nfgenmsg *nfmsg;
419 struct nlattr *nest_parms;
420 struct nf_conn *ct = (struct nf_conn *)ptr;
421 struct sk_buff *skb;
422 unsigned int type;
423 sk_buff_data_t b;
424 unsigned int flags = 0, group;
425
426 /* ignore our fake conntrack entry */
427 if (ct == &nf_conntrack_untracked)
428 return NOTIFY_DONE;
429
430 if (events & IPCT_DESTROY) {
431 type = IPCTNL_MSG_CT_DELETE;
432 group = NFNLGRP_CONNTRACK_DESTROY;
433 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
434 type = IPCTNL_MSG_CT_NEW;
435 flags = NLM_F_CREATE|NLM_F_EXCL;
436 group = NFNLGRP_CONNTRACK_NEW;
437 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
438 type = IPCTNL_MSG_CT_NEW;
439 group = NFNLGRP_CONNTRACK_UPDATE;
440 } else
441 return NOTIFY_DONE;
442
443 if (!nfnetlink_has_listeners(group))
444 return NOTIFY_DONE;
445
446 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
447 if (!skb)
448 return NOTIFY_DONE;
449
450 b = skb->tail;
451
452 type |= NFNL_SUBSYS_CTNETLINK << 8;
453 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
454 nfmsg = NLMSG_DATA(nlh);
455
456 nlh->nlmsg_flags = flags;
457 nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
458 nfmsg->version = NFNETLINK_V0;
459 nfmsg->res_id = 0;
460
461 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
462 if (!nest_parms)
463 goto nla_put_failure;
464 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
465 goto nla_put_failure;
466 nla_nest_end(skb, nest_parms);
467
468 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
469 if (!nest_parms)
470 goto nla_put_failure;
471 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
472 goto nla_put_failure;
473 nla_nest_end(skb, nest_parms);
474
475 if (events & IPCT_DESTROY) {
476 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
477 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
478 goto nla_put_failure;
479 } else {
480 if (ctnetlink_dump_status(skb, ct) < 0)
481 goto nla_put_failure;
482
483 if (ctnetlink_dump_timeout(skb, ct) < 0)
484 goto nla_put_failure;
485
486 if (events & IPCT_PROTOINFO
487 && ctnetlink_dump_protoinfo(skb, ct) < 0)
488 goto nla_put_failure;
489
490 if ((events & IPCT_HELPER || nfct_help(ct))
491 && ctnetlink_dump_helpinfo(skb, ct) < 0)
492 goto nla_put_failure;
493
494 #ifdef CONFIG_NF_CONNTRACK_SECMARK
495 if ((events & IPCT_SECMARK || ct->secmark)
496 && ctnetlink_dump_secmark(skb, ct) < 0)
497 goto nla_put_failure;
498 #endif
499
500 if (events & IPCT_COUNTER_FILLING &&
501 (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
502 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
503 goto nla_put_failure;
504
505 if (events & IPCT_RELATED &&
506 ctnetlink_dump_master(skb, ct) < 0)
507 goto nla_put_failure;
508
509 if (events & IPCT_NATSEQADJ &&
510 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
511 goto nla_put_failure;
512 }
513
514 #ifdef CONFIG_NF_CONNTRACK_MARK
515 if ((events & IPCT_MARK || ct->mark)
516 && ctnetlink_dump_mark(skb, ct) < 0)
517 goto nla_put_failure;
518 #endif
519
520 nlh->nlmsg_len = skb->tail - b;
521 nfnetlink_send(skb, 0, group, 0);
522 return NOTIFY_DONE;
523
524 nlmsg_failure:
525 nla_put_failure:
526 kfree_skb(skb);
527 return NOTIFY_DONE;
528 }
529 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
530
531 static int ctnetlink_done(struct netlink_callback *cb)
532 {
533 if (cb->args[1])
534 nf_ct_put((struct nf_conn *)cb->args[1]);
535 return 0;
536 }
537
538 #define L3PROTO(ct) (ct)->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
539
540 static int
541 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
542 {
543 struct nf_conn *ct, *last;
544 struct nf_conntrack_tuple_hash *h;
545 struct hlist_node *n;
546 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
547 u_int8_t l3proto = nfmsg->nfgen_family;
548
549 rcu_read_lock();
550 last = (struct nf_conn *)cb->args[1];
551 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
552 restart:
553 hlist_for_each_entry_rcu(h, n, &nf_conntrack_hash[cb->args[0]],
554 hnode) {
555 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
556 continue;
557 ct = nf_ct_tuplehash_to_ctrack(h);
558 /* Dump entries of a given L3 protocol number.
559 * If it is not specified, ie. l3proto == 0,
560 * then dump everything. */
561 if (l3proto && L3PROTO(ct) != l3proto)
562 continue;
563 if (cb->args[1]) {
564 if (ct != last)
565 continue;
566 cb->args[1] = 0;
567 }
568 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
569 cb->nlh->nlmsg_seq,
570 IPCTNL_MSG_CT_NEW,
571 1, ct) < 0) {
572 if (!atomic_inc_not_zero(&ct->ct_general.use))
573 continue;
574 cb->args[1] = (unsigned long)ct;
575 goto out;
576 }
577 #ifdef CONFIG_NF_CT_ACCT
578 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
579 IPCTNL_MSG_CT_GET_CTRZERO)
580 memset(&ct->counters, 0, sizeof(ct->counters));
581 #endif
582 }
583 if (cb->args[1]) {
584 cb->args[1] = 0;
585 goto restart;
586 }
587 }
588 out:
589 rcu_read_unlock();
590 if (last)
591 nf_ct_put(last);
592
593 return skb->len;
594 }
595
596 static inline int
597 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
598 {
599 struct nlattr *tb[CTA_IP_MAX+1];
600 struct nf_conntrack_l3proto *l3proto;
601 int ret = 0;
602
603 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
604
605 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
606
607 if (likely(l3proto->nlattr_to_tuple)) {
608 ret = nla_validate_nested(attr, CTA_IP_MAX,
609 l3proto->nla_policy);
610 if (ret == 0)
611 ret = l3proto->nlattr_to_tuple(tb, tuple);
612 }
613
614 nf_ct_l3proto_put(l3proto);
615
616 return ret;
617 }
618
619 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
620 [CTA_PROTO_NUM] = { .type = NLA_U8 },
621 };
622
623 static inline int
624 ctnetlink_parse_tuple_proto(struct nlattr *attr,
625 struct nf_conntrack_tuple *tuple)
626 {
627 struct nlattr *tb[CTA_PROTO_MAX+1];
628 struct nf_conntrack_l4proto *l4proto;
629 int ret = 0;
630
631 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
632 if (ret < 0)
633 return ret;
634
635 if (!tb[CTA_PROTO_NUM])
636 return -EINVAL;
637 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
638
639 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
640
641 if (likely(l4proto->nlattr_to_tuple)) {
642 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
643 l4proto->nla_policy);
644 if (ret == 0)
645 ret = l4proto->nlattr_to_tuple(tb, tuple);
646 }
647
648 nf_ct_l4proto_put(l4proto);
649
650 return ret;
651 }
652
653 static int
654 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
655 enum ctattr_tuple type, u_int8_t l3num)
656 {
657 struct nlattr *tb[CTA_TUPLE_MAX+1];
658 int err;
659
660 memset(tuple, 0, sizeof(*tuple));
661
662 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
663
664 if (!tb[CTA_TUPLE_IP])
665 return -EINVAL;
666
667 tuple->src.l3num = l3num;
668
669 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
670 if (err < 0)
671 return err;
672
673 if (!tb[CTA_TUPLE_PROTO])
674 return -EINVAL;
675
676 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
677 if (err < 0)
678 return err;
679
680 /* orig and expect tuples get DIR_ORIGINAL */
681 if (type == CTA_TUPLE_REPLY)
682 tuple->dst.dir = IP_CT_DIR_REPLY;
683 else
684 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
685
686 return 0;
687 }
688
689 #ifdef CONFIG_NF_NAT_NEEDED
690 static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
691 [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 },
692 [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 },
693 };
694
695 static int nfnetlink_parse_nat_proto(struct nlattr *attr,
696 const struct nf_conn *ct,
697 struct nf_nat_range *range)
698 {
699 struct nlattr *tb[CTA_PROTONAT_MAX+1];
700 const struct nf_nat_protocol *npt;
701 int err;
702
703 err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
704 if (err < 0)
705 return err;
706
707 npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
708
709 if (!npt->nlattr_to_range) {
710 nf_nat_proto_put(npt);
711 return 0;
712 }
713
714 /* nlattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
715 if (npt->nlattr_to_range(tb, range) > 0)
716 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
717
718 nf_nat_proto_put(npt);
719
720 return 0;
721 }
722
723 static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
724 [CTA_NAT_MINIP] = { .type = NLA_U32 },
725 [CTA_NAT_MAXIP] = { .type = NLA_U32 },
726 };
727
728 static inline int
729 nfnetlink_parse_nat(struct nlattr *nat,
730 const struct nf_conn *ct, struct nf_nat_range *range)
731 {
732 struct nlattr *tb[CTA_NAT_MAX+1];
733 int err;
734
735 memset(range, 0, sizeof(*range));
736
737 err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
738 if (err < 0)
739 return err;
740
741 if (tb[CTA_NAT_MINIP])
742 range->min_ip = nla_get_be32(tb[CTA_NAT_MINIP]);
743
744 if (!tb[CTA_NAT_MAXIP])
745 range->max_ip = range->min_ip;
746 else
747 range->max_ip = nla_get_be32(tb[CTA_NAT_MAXIP]);
748
749 if (range->min_ip)
750 range->flags |= IP_NAT_RANGE_MAP_IPS;
751
752 if (!tb[CTA_NAT_PROTO])
753 return 0;
754
755 err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
756 if (err < 0)
757 return err;
758
759 return 0;
760 }
761 #endif
762
763 static inline int
764 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
765 {
766 struct nlattr *tb[CTA_HELP_MAX+1];
767
768 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
769
770 if (!tb[CTA_HELP_NAME])
771 return -EINVAL;
772
773 *helper_name = nla_data(tb[CTA_HELP_NAME]);
774
775 return 0;
776 }
777
778 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
779 [CTA_STATUS] = { .type = NLA_U32 },
780 [CTA_TIMEOUT] = { .type = NLA_U32 },
781 [CTA_MARK] = { .type = NLA_U32 },
782 [CTA_USE] = { .type = NLA_U32 },
783 [CTA_ID] = { .type = NLA_U32 },
784 };
785
786 static int
787 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
788 struct nlmsghdr *nlh, struct nlattr *cda[])
789 {
790 struct nf_conntrack_tuple_hash *h;
791 struct nf_conntrack_tuple tuple;
792 struct nf_conn *ct;
793 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
794 u_int8_t u3 = nfmsg->nfgen_family;
795 int err = 0;
796
797 if (cda[CTA_TUPLE_ORIG])
798 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
799 else if (cda[CTA_TUPLE_REPLY])
800 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
801 else {
802 /* Flush the whole table */
803 nf_conntrack_flush();
804 return 0;
805 }
806
807 if (err < 0)
808 return err;
809
810 h = nf_conntrack_find_get(&tuple);
811 if (!h)
812 return -ENOENT;
813
814 ct = nf_ct_tuplehash_to_ctrack(h);
815
816 if (cda[CTA_ID]) {
817 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
818 if (id != (u32)(unsigned long)ct) {
819 nf_ct_put(ct);
820 return -ENOENT;
821 }
822 }
823 if (del_timer(&ct->timeout))
824 ct->timeout.function((unsigned long)ct);
825
826 nf_ct_put(ct);
827
828 return 0;
829 }
830
831 static int
832 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
833 struct nlmsghdr *nlh, struct nlattr *cda[])
834 {
835 struct nf_conntrack_tuple_hash *h;
836 struct nf_conntrack_tuple tuple;
837 struct nf_conn *ct;
838 struct sk_buff *skb2 = NULL;
839 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
840 u_int8_t u3 = nfmsg->nfgen_family;
841 int err = 0;
842
843 if (nlh->nlmsg_flags & NLM_F_DUMP) {
844 #ifndef CONFIG_NF_CT_ACCT
845 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
846 return -ENOTSUPP;
847 #endif
848 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
849 ctnetlink_done);
850 }
851
852 if (cda[CTA_TUPLE_ORIG])
853 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
854 else if (cda[CTA_TUPLE_REPLY])
855 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
856 else
857 return -EINVAL;
858
859 if (err < 0)
860 return err;
861
862 h = nf_conntrack_find_get(&tuple);
863 if (!h)
864 return -ENOENT;
865
866 ct = nf_ct_tuplehash_to_ctrack(h);
867
868 err = -ENOMEM;
869 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
870 if (!skb2) {
871 nf_ct_put(ct);
872 return -ENOMEM;
873 }
874
875 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
876 IPCTNL_MSG_CT_NEW, 1, ct);
877 nf_ct_put(ct);
878 if (err <= 0)
879 goto free;
880
881 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
882 if (err < 0)
883 goto out;
884
885 return 0;
886
887 free:
888 kfree_skb(skb2);
889 out:
890 return err;
891 }
892
893 static int
894 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
895 {
896 unsigned long d;
897 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
898 d = ct->status ^ status;
899
900 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
901 /* unchangeable */
902 return -EINVAL;
903
904 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
905 /* SEEN_REPLY bit can only be set */
906 return -EINVAL;
907
908
909 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
910 /* ASSURED bit can only be set */
911 return -EINVAL;
912
913 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
914 #ifndef CONFIG_NF_NAT_NEEDED
915 return -EINVAL;
916 #else
917 struct nf_nat_range range;
918
919 if (cda[CTA_NAT_DST]) {
920 if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
921 &range) < 0)
922 return -EINVAL;
923 if (nf_nat_initialized(ct, IP_NAT_MANIP_DST))
924 return -EEXIST;
925 nf_nat_setup_info(ct, &range, IP_NAT_MANIP_DST);
926 }
927 if (cda[CTA_NAT_SRC]) {
928 if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
929 &range) < 0)
930 return -EINVAL;
931 if (nf_nat_initialized(ct, IP_NAT_MANIP_SRC))
932 return -EEXIST;
933 nf_nat_setup_info(ct, &range, IP_NAT_MANIP_SRC);
934 }
935 #endif
936 }
937
938 /* Be careful here, modifying NAT bits can screw up things,
939 * so don't let users modify them directly if they don't pass
940 * nf_nat_range. */
941 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
942 return 0;
943 }
944
945
946 static inline int
947 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
948 {
949 struct nf_conntrack_helper *helper;
950 struct nf_conn_help *help = nfct_help(ct);
951 char *helpname;
952 int err;
953
954 /* don't change helper of sibling connections */
955 if (ct->master)
956 return -EINVAL;
957
958 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
959 if (err < 0)
960 return err;
961
962 if (!strcmp(helpname, "")) {
963 if (help && help->helper) {
964 /* we had a helper before ... */
965 nf_ct_remove_expectations(ct);
966 rcu_assign_pointer(help->helper, NULL);
967 }
968
969 return 0;
970 }
971
972 helper = __nf_conntrack_helper_find_byname(helpname);
973 if (helper == NULL)
974 return -EINVAL;
975
976 if (help) {
977 if (help->helper == helper)
978 return 0;
979 if (help->helper)
980 return -EBUSY;
981 /* need to zero data of old helper */
982 memset(&help->help, 0, sizeof(help->help));
983 } else {
984 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
985 if (help == NULL)
986 return -ENOMEM;
987 }
988
989 rcu_assign_pointer(help->helper, helper);
990
991 return 0;
992 }
993
994 static inline int
995 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
996 {
997 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
998
999 if (!del_timer(&ct->timeout))
1000 return -ETIME;
1001
1002 ct->timeout.expires = jiffies + timeout * HZ;
1003 add_timer(&ct->timeout);
1004
1005 return 0;
1006 }
1007
1008 static inline int
1009 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1010 {
1011 struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1012 struct nf_conntrack_l4proto *l4proto;
1013 u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
1014 u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
1015 int err = 0;
1016
1017 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1018
1019 l4proto = nf_ct_l4proto_find_get(l3num, npt);
1020
1021 if (l4proto->from_nlattr)
1022 err = l4proto->from_nlattr(tb, ct);
1023 nf_ct_l4proto_put(l4proto);
1024
1025 return err;
1026 }
1027
1028 #ifdef CONFIG_NF_NAT_NEEDED
1029 static inline int
1030 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1031 {
1032 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1033
1034 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1035
1036 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1037 return -EINVAL;
1038
1039 natseq->correction_pos =
1040 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1041
1042 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1043 return -EINVAL;
1044
1045 natseq->offset_before =
1046 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1047
1048 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1049 return -EINVAL;
1050
1051 natseq->offset_after =
1052 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1053
1054 return 0;
1055 }
1056
1057 static int
1058 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1059 {
1060 int ret = 0;
1061 struct nf_conn_nat *nat = nfct_nat(ct);
1062
1063 if (!nat)
1064 return 0;
1065
1066 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1067 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1068 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1069 if (ret < 0)
1070 return ret;
1071
1072 ct->status |= IPS_SEQ_ADJUST;
1073 }
1074
1075 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1076 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1077 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1078 if (ret < 0)
1079 return ret;
1080
1081 ct->status |= IPS_SEQ_ADJUST;
1082 }
1083
1084 return 0;
1085 }
1086 #endif
1087
1088 static int
1089 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1090 {
1091 int err;
1092
1093 if (cda[CTA_HELP]) {
1094 err = ctnetlink_change_helper(ct, cda);
1095 if (err < 0)
1096 return err;
1097 }
1098
1099 if (cda[CTA_TIMEOUT]) {
1100 err = ctnetlink_change_timeout(ct, cda);
1101 if (err < 0)
1102 return err;
1103 }
1104
1105 if (cda[CTA_STATUS]) {
1106 err = ctnetlink_change_status(ct, cda);
1107 if (err < 0)
1108 return err;
1109 }
1110
1111 if (cda[CTA_PROTOINFO]) {
1112 err = ctnetlink_change_protoinfo(ct, cda);
1113 if (err < 0)
1114 return err;
1115 }
1116
1117 #if defined(CONFIG_NF_CONNTRACK_MARK)
1118 if (cda[CTA_MARK])
1119 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1120 #endif
1121
1122 #ifdef CONFIG_NF_NAT_NEEDED
1123 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1124 err = ctnetlink_change_nat_seq_adj(ct, cda);
1125 if (err < 0)
1126 return err;
1127 }
1128 #endif
1129
1130 return 0;
1131 }
1132
1133 static int
1134 ctnetlink_create_conntrack(struct nlattr *cda[],
1135 struct nf_conntrack_tuple *otuple,
1136 struct nf_conntrack_tuple *rtuple,
1137 struct nf_conn *master_ct)
1138 {
1139 struct nf_conn *ct;
1140 int err = -EINVAL;
1141 struct nf_conn_help *help;
1142 struct nf_conntrack_helper *helper;
1143
1144 ct = nf_conntrack_alloc(otuple, rtuple);
1145 if (ct == NULL || IS_ERR(ct))
1146 return -ENOMEM;
1147
1148 if (!cda[CTA_TIMEOUT])
1149 goto err;
1150 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1151
1152 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1153 ct->status |= IPS_CONFIRMED;
1154
1155 if (cda[CTA_STATUS]) {
1156 err = ctnetlink_change_status(ct, cda);
1157 if (err < 0)
1158 goto err;
1159 }
1160
1161 if (cda[CTA_PROTOINFO]) {
1162 err = ctnetlink_change_protoinfo(ct, cda);
1163 if (err < 0)
1164 goto err;
1165 }
1166
1167 #if defined(CONFIG_NF_CONNTRACK_MARK)
1168 if (cda[CTA_MARK])
1169 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1170 #endif
1171
1172 rcu_read_lock();
1173 helper = __nf_ct_helper_find(rtuple);
1174 if (helper) {
1175 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
1176 if (help == NULL) {
1177 rcu_read_unlock();
1178 err = -ENOMEM;
1179 goto err;
1180 }
1181 /* not in hash table yet so not strictly necessary */
1182 rcu_assign_pointer(help->helper, helper);
1183 }
1184
1185 /* setup master conntrack: this is a confirmed expectation */
1186 if (master_ct) {
1187 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1188 ct->master = master_ct;
1189 }
1190
1191 add_timer(&ct->timeout);
1192 nf_conntrack_hash_insert(ct);
1193 rcu_read_unlock();
1194
1195 return 0;
1196
1197 err:
1198 nf_conntrack_free(ct);
1199 return err;
1200 }
1201
1202 static int
1203 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1204 struct nlmsghdr *nlh, struct nlattr *cda[])
1205 {
1206 struct nf_conntrack_tuple otuple, rtuple;
1207 struct nf_conntrack_tuple_hash *h = NULL;
1208 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1209 u_int8_t u3 = nfmsg->nfgen_family;
1210 int err = 0;
1211
1212 if (cda[CTA_TUPLE_ORIG]) {
1213 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1214 if (err < 0)
1215 return err;
1216 }
1217
1218 if (cda[CTA_TUPLE_REPLY]) {
1219 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1220 if (err < 0)
1221 return err;
1222 }
1223
1224 spin_lock_bh(&nf_conntrack_lock);
1225 if (cda[CTA_TUPLE_ORIG])
1226 h = __nf_conntrack_find(&otuple);
1227 else if (cda[CTA_TUPLE_REPLY])
1228 h = __nf_conntrack_find(&rtuple);
1229
1230 if (h == NULL) {
1231 struct nf_conntrack_tuple master;
1232 struct nf_conntrack_tuple_hash *master_h = NULL;
1233 struct nf_conn *master_ct = NULL;
1234
1235 if (cda[CTA_TUPLE_MASTER]) {
1236 err = ctnetlink_parse_tuple(cda,
1237 &master,
1238 CTA_TUPLE_MASTER,
1239 u3);
1240 if (err < 0)
1241 goto out_unlock;
1242
1243 master_h = __nf_conntrack_find(&master);
1244 if (master_h == NULL) {
1245 err = -ENOENT;
1246 goto out_unlock;
1247 }
1248 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1249 atomic_inc(&master_ct->ct_general.use);
1250 }
1251
1252 spin_unlock_bh(&nf_conntrack_lock);
1253 err = -ENOENT;
1254 if (nlh->nlmsg_flags & NLM_F_CREATE)
1255 err = ctnetlink_create_conntrack(cda,
1256 &otuple,
1257 &rtuple,
1258 master_ct);
1259 if (err < 0 && master_ct)
1260 nf_ct_put(master_ct);
1261
1262 return err;
1263 }
1264 /* implicit 'else' */
1265
1266 /* We manipulate the conntrack inside the global conntrack table lock,
1267 * so there's no need to increase the refcount */
1268 err = -EEXIST;
1269 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1270 /* we only allow nat config for new conntracks */
1271 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1272 err = -EINVAL;
1273 goto out_unlock;
1274 }
1275 /* can't link an existing conntrack to a master */
1276 if (cda[CTA_TUPLE_MASTER]) {
1277 err = -EINVAL;
1278 goto out_unlock;
1279 }
1280 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1281 cda);
1282 }
1283
1284 out_unlock:
1285 spin_unlock_bh(&nf_conntrack_lock);
1286 return err;
1287 }
1288
1289 /***********************************************************************
1290 * EXPECT
1291 ***********************************************************************/
1292
1293 static inline int
1294 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1295 const struct nf_conntrack_tuple *tuple,
1296 enum ctattr_expect type)
1297 {
1298 struct nlattr *nest_parms;
1299
1300 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1301 if (!nest_parms)
1302 goto nla_put_failure;
1303 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1304 goto nla_put_failure;
1305 nla_nest_end(skb, nest_parms);
1306
1307 return 0;
1308
1309 nla_put_failure:
1310 return -1;
1311 }
1312
1313 static inline int
1314 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1315 const struct nf_conntrack_tuple *tuple,
1316 const struct nf_conntrack_tuple_mask *mask)
1317 {
1318 int ret;
1319 struct nf_conntrack_l3proto *l3proto;
1320 struct nf_conntrack_l4proto *l4proto;
1321 struct nf_conntrack_tuple m;
1322 struct nlattr *nest_parms;
1323
1324 memset(&m, 0xFF, sizeof(m));
1325 m.src.u.all = mask->src.u.all;
1326 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1327
1328 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1329 if (!nest_parms)
1330 goto nla_put_failure;
1331
1332 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1333 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1334 nf_ct_l3proto_put(l3proto);
1335
1336 if (unlikely(ret < 0))
1337 goto nla_put_failure;
1338
1339 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1340 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1341 nf_ct_l4proto_put(l4proto);
1342 if (unlikely(ret < 0))
1343 goto nla_put_failure;
1344
1345 nla_nest_end(skb, nest_parms);
1346
1347 return 0;
1348
1349 nla_put_failure:
1350 return -1;
1351 }
1352
1353 static int
1354 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1355 const struct nf_conntrack_expect *exp)
1356 {
1357 struct nf_conn *master = exp->master;
1358 long timeout = (exp->timeout.expires - jiffies) / HZ;
1359
1360 if (timeout < 0)
1361 timeout = 0;
1362
1363 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1364 goto nla_put_failure;
1365 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1366 goto nla_put_failure;
1367 if (ctnetlink_exp_dump_tuple(skb,
1368 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1369 CTA_EXPECT_MASTER) < 0)
1370 goto nla_put_failure;
1371
1372 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1373 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1374
1375 return 0;
1376
1377 nla_put_failure:
1378 return -1;
1379 }
1380
1381 static int
1382 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1383 int event,
1384 int nowait,
1385 const struct nf_conntrack_expect *exp)
1386 {
1387 struct nlmsghdr *nlh;
1388 struct nfgenmsg *nfmsg;
1389 unsigned char *b = skb_tail_pointer(skb);
1390
1391 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1392 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1393 nfmsg = NLMSG_DATA(nlh);
1394
1395 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1396 nfmsg->nfgen_family = exp->tuple.src.l3num;
1397 nfmsg->version = NFNETLINK_V0;
1398 nfmsg->res_id = 0;
1399
1400 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1401 goto nla_put_failure;
1402
1403 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1404 return skb->len;
1405
1406 nlmsg_failure:
1407 nla_put_failure:
1408 nlmsg_trim(skb, b);
1409 return -1;
1410 }
1411
1412 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1413 static int ctnetlink_expect_event(struct notifier_block *this,
1414 unsigned long events, void *ptr)
1415 {
1416 struct nlmsghdr *nlh;
1417 struct nfgenmsg *nfmsg;
1418 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1419 struct sk_buff *skb;
1420 unsigned int type;
1421 sk_buff_data_t b;
1422 int flags = 0;
1423
1424 if (events & IPEXP_NEW) {
1425 type = IPCTNL_MSG_EXP_NEW;
1426 flags = NLM_F_CREATE|NLM_F_EXCL;
1427 } else
1428 return NOTIFY_DONE;
1429
1430 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1431 return NOTIFY_DONE;
1432
1433 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1434 if (!skb)
1435 return NOTIFY_DONE;
1436
1437 b = skb->tail;
1438
1439 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1440 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1441 nfmsg = NLMSG_DATA(nlh);
1442
1443 nlh->nlmsg_flags = flags;
1444 nfmsg->nfgen_family = exp->tuple.src.l3num;
1445 nfmsg->version = NFNETLINK_V0;
1446 nfmsg->res_id = 0;
1447
1448 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1449 goto nla_put_failure;
1450
1451 nlh->nlmsg_len = skb->tail - b;
1452 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1453 return NOTIFY_DONE;
1454
1455 nlmsg_failure:
1456 nla_put_failure:
1457 kfree_skb(skb);
1458 return NOTIFY_DONE;
1459 }
1460 #endif
1461 static int ctnetlink_exp_done(struct netlink_callback *cb)
1462 {
1463 if (cb->args[1])
1464 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1465 return 0;
1466 }
1467
1468 static int
1469 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1470 {
1471 struct nf_conntrack_expect *exp, *last;
1472 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1473 struct hlist_node *n;
1474 u_int8_t l3proto = nfmsg->nfgen_family;
1475
1476 rcu_read_lock();
1477 last = (struct nf_conntrack_expect *)cb->args[1];
1478 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1479 restart:
1480 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1481 hnode) {
1482 if (l3proto && exp->tuple.src.l3num != l3proto)
1483 continue;
1484 if (cb->args[1]) {
1485 if (exp != last)
1486 continue;
1487 cb->args[1] = 0;
1488 }
1489 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1490 cb->nlh->nlmsg_seq,
1491 IPCTNL_MSG_EXP_NEW,
1492 1, exp) < 0) {
1493 if (!atomic_inc_not_zero(&exp->use))
1494 continue;
1495 cb->args[1] = (unsigned long)exp;
1496 goto out;
1497 }
1498 }
1499 if (cb->args[1]) {
1500 cb->args[1] = 0;
1501 goto restart;
1502 }
1503 }
1504 out:
1505 rcu_read_unlock();
1506 if (last)
1507 nf_ct_expect_put(last);
1508
1509 return skb->len;
1510 }
1511
1512 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1513 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1514 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1515 };
1516
1517 static int
1518 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1519 struct nlmsghdr *nlh, struct nlattr *cda[])
1520 {
1521 struct nf_conntrack_tuple tuple;
1522 struct nf_conntrack_expect *exp;
1523 struct sk_buff *skb2;
1524 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1525 u_int8_t u3 = nfmsg->nfgen_family;
1526 int err = 0;
1527
1528 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1529 return netlink_dump_start(ctnl, skb, nlh,
1530 ctnetlink_exp_dump_table,
1531 ctnetlink_exp_done);
1532 }
1533
1534 if (cda[CTA_EXPECT_MASTER])
1535 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1536 else
1537 return -EINVAL;
1538
1539 if (err < 0)
1540 return err;
1541
1542 exp = nf_ct_expect_find_get(&tuple);
1543 if (!exp)
1544 return -ENOENT;
1545
1546 if (cda[CTA_EXPECT_ID]) {
1547 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1548 if (ntohl(id) != (u32)(unsigned long)exp) {
1549 nf_ct_expect_put(exp);
1550 return -ENOENT;
1551 }
1552 }
1553
1554 err = -ENOMEM;
1555 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1556 if (!skb2)
1557 goto out;
1558
1559 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1560 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1561 1, exp);
1562 if (err <= 0)
1563 goto free;
1564
1565 nf_ct_expect_put(exp);
1566
1567 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1568
1569 free:
1570 kfree_skb(skb2);
1571 out:
1572 nf_ct_expect_put(exp);
1573 return err;
1574 }
1575
1576 static int
1577 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1578 struct nlmsghdr *nlh, struct nlattr *cda[])
1579 {
1580 struct nf_conntrack_expect *exp;
1581 struct nf_conntrack_tuple tuple;
1582 struct nf_conntrack_helper *h;
1583 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1584 struct hlist_node *n, *next;
1585 u_int8_t u3 = nfmsg->nfgen_family;
1586 unsigned int i;
1587 int err;
1588
1589 if (cda[CTA_EXPECT_TUPLE]) {
1590 /* delete a single expect by tuple */
1591 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1592 if (err < 0)
1593 return err;
1594
1595 /* bump usage count to 2 */
1596 exp = nf_ct_expect_find_get(&tuple);
1597 if (!exp)
1598 return -ENOENT;
1599
1600 if (cda[CTA_EXPECT_ID]) {
1601 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1602 if (ntohl(id) != (u32)(unsigned long)exp) {
1603 nf_ct_expect_put(exp);
1604 return -ENOENT;
1605 }
1606 }
1607
1608 /* after list removal, usage count == 1 */
1609 nf_ct_unexpect_related(exp);
1610 /* have to put what we 'get' above.
1611 * after this line usage count == 0 */
1612 nf_ct_expect_put(exp);
1613 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1614 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1615 struct nf_conn_help *m_help;
1616
1617 /* delete all expectations for this helper */
1618 spin_lock_bh(&nf_conntrack_lock);
1619 h = __nf_conntrack_helper_find_byname(name);
1620 if (!h) {
1621 spin_unlock_bh(&nf_conntrack_lock);
1622 return -EINVAL;
1623 }
1624 for (i = 0; i < nf_ct_expect_hsize; i++) {
1625 hlist_for_each_entry_safe(exp, n, next,
1626 &nf_ct_expect_hash[i],
1627 hnode) {
1628 m_help = nfct_help(exp->master);
1629 if (m_help->helper == h
1630 && del_timer(&exp->timeout)) {
1631 nf_ct_unlink_expect(exp);
1632 nf_ct_expect_put(exp);
1633 }
1634 }
1635 }
1636 spin_unlock_bh(&nf_conntrack_lock);
1637 } else {
1638 /* This basically means we have to flush everything*/
1639 spin_lock_bh(&nf_conntrack_lock);
1640 for (i = 0; i < nf_ct_expect_hsize; i++) {
1641 hlist_for_each_entry_safe(exp, n, next,
1642 &nf_ct_expect_hash[i],
1643 hnode) {
1644 if (del_timer(&exp->timeout)) {
1645 nf_ct_unlink_expect(exp);
1646 nf_ct_expect_put(exp);
1647 }
1648 }
1649 }
1650 spin_unlock_bh(&nf_conntrack_lock);
1651 }
1652
1653 return 0;
1654 }
1655 static int
1656 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1657 {
1658 return -EOPNOTSUPP;
1659 }
1660
1661 static int
1662 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1663 {
1664 struct nf_conntrack_tuple tuple, mask, master_tuple;
1665 struct nf_conntrack_tuple_hash *h = NULL;
1666 struct nf_conntrack_expect *exp;
1667 struct nf_conn *ct;
1668 struct nf_conn_help *help;
1669 int err = 0;
1670
1671 /* caller guarantees that those three CTA_EXPECT_* exist */
1672 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1673 if (err < 0)
1674 return err;
1675 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1676 if (err < 0)
1677 return err;
1678 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1679 if (err < 0)
1680 return err;
1681
1682 /* Look for master conntrack of this expectation */
1683 h = nf_conntrack_find_get(&master_tuple);
1684 if (!h)
1685 return -ENOENT;
1686 ct = nf_ct_tuplehash_to_ctrack(h);
1687 help = nfct_help(ct);
1688
1689 if (!help || !help->helper) {
1690 /* such conntrack hasn't got any helper, abort */
1691 err = -EINVAL;
1692 goto out;
1693 }
1694
1695 exp = nf_ct_expect_alloc(ct);
1696 if (!exp) {
1697 err = -ENOMEM;
1698 goto out;
1699 }
1700
1701 exp->expectfn = NULL;
1702 exp->flags = 0;
1703 exp->master = ct;
1704 exp->helper = NULL;
1705 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1706 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1707 exp->mask.src.u.all = mask.src.u.all;
1708
1709 err = nf_ct_expect_related(exp);
1710 nf_ct_expect_put(exp);
1711
1712 out:
1713 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1714 return err;
1715 }
1716
1717 static int
1718 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1719 struct nlmsghdr *nlh, struct nlattr *cda[])
1720 {
1721 struct nf_conntrack_tuple tuple;
1722 struct nf_conntrack_expect *exp;
1723 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1724 u_int8_t u3 = nfmsg->nfgen_family;
1725 int err = 0;
1726
1727 if (!cda[CTA_EXPECT_TUPLE]
1728 || !cda[CTA_EXPECT_MASK]
1729 || !cda[CTA_EXPECT_MASTER])
1730 return -EINVAL;
1731
1732 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1733 if (err < 0)
1734 return err;
1735
1736 spin_lock_bh(&nf_conntrack_lock);
1737 exp = __nf_ct_expect_find(&tuple);
1738
1739 if (!exp) {
1740 spin_unlock_bh(&nf_conntrack_lock);
1741 err = -ENOENT;
1742 if (nlh->nlmsg_flags & NLM_F_CREATE)
1743 err = ctnetlink_create_expect(cda, u3);
1744 return err;
1745 }
1746
1747 err = -EEXIST;
1748 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1749 err = ctnetlink_change_expect(exp, cda);
1750 spin_unlock_bh(&nf_conntrack_lock);
1751
1752 return err;
1753 }
1754
1755 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1756 static struct notifier_block ctnl_notifier = {
1757 .notifier_call = ctnetlink_conntrack_event,
1758 };
1759
1760 static struct notifier_block ctnl_notifier_exp = {
1761 .notifier_call = ctnetlink_expect_event,
1762 };
1763 #endif
1764
1765 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1766 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1767 .attr_count = CTA_MAX,
1768 .policy = ct_nla_policy },
1769 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1770 .attr_count = CTA_MAX,
1771 .policy = ct_nla_policy },
1772 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1773 .attr_count = CTA_MAX,
1774 .policy = ct_nla_policy },
1775 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1776 .attr_count = CTA_MAX,
1777 .policy = ct_nla_policy },
1778 };
1779
1780 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1781 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1782 .attr_count = CTA_EXPECT_MAX,
1783 .policy = exp_nla_policy },
1784 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1785 .attr_count = CTA_EXPECT_MAX,
1786 .policy = exp_nla_policy },
1787 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1788 .attr_count = CTA_EXPECT_MAX,
1789 .policy = exp_nla_policy },
1790 };
1791
1792 static const struct nfnetlink_subsystem ctnl_subsys = {
1793 .name = "conntrack",
1794 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1795 .cb_count = IPCTNL_MSG_MAX,
1796 .cb = ctnl_cb,
1797 };
1798
1799 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1800 .name = "conntrack_expect",
1801 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1802 .cb_count = IPCTNL_MSG_EXP_MAX,
1803 .cb = ctnl_exp_cb,
1804 };
1805
1806 MODULE_ALIAS("ip_conntrack_netlink");
1807 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1808 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1809
1810 static int __init ctnetlink_init(void)
1811 {
1812 int ret;
1813
1814 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1815 ret = nfnetlink_subsys_register(&ctnl_subsys);
1816 if (ret < 0) {
1817 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1818 goto err_out;
1819 }
1820
1821 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1822 if (ret < 0) {
1823 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1824 goto err_unreg_subsys;
1825 }
1826
1827 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1828 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1829 if (ret < 0) {
1830 printk("ctnetlink_init: cannot register notifier.\n");
1831 goto err_unreg_exp_subsys;
1832 }
1833
1834 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1835 if (ret < 0) {
1836 printk("ctnetlink_init: cannot expect register notifier.\n");
1837 goto err_unreg_notifier;
1838 }
1839 #endif
1840
1841 return 0;
1842
1843 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1844 err_unreg_notifier:
1845 nf_conntrack_unregister_notifier(&ctnl_notifier);
1846 err_unreg_exp_subsys:
1847 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1848 #endif
1849 err_unreg_subsys:
1850 nfnetlink_subsys_unregister(&ctnl_subsys);
1851 err_out:
1852 return ret;
1853 }
1854
1855 static void __exit ctnetlink_exit(void)
1856 {
1857 printk("ctnetlink: unregistering from nfnetlink.\n");
1858
1859 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1860 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1861 nf_conntrack_unregister_notifier(&ctnl_notifier);
1862 #endif
1863
1864 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1865 nfnetlink_subsys_unregister(&ctnl_subsys);
1866 return;
1867 }
1868
1869 module_init(ctnetlink_init);
1870 module_exit(ctnetlink_exit);
WRT350N Kernel Patches