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netfilter: nf_conntrack: use SLAB_DESTROY_BY_RCU and get rid of call_rcu()
[linux-2.6/libata-dev.git] / net / netfilter / nf_conntrack_netlink.c
blob349bbefe5517682fd8d5592472606454a3282f71
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/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/skbuff.h>
26 #include <linux/errno.h>
27 #include <linux/netlink.h>
28 #include <linux/spinlock.h>
29 #include <linux/interrupt.h>
30 #include <linux/notifier.h>
31
32 #include <linux/netfilter.h>
33 #include <net/netlink.h>
34 #include <net/netfilter/nf_conntrack.h>
35 #include <net/netfilter/nf_conntrack_core.h>
36 #include <net/netfilter/nf_conntrack_expect.h>
37 #include <net/netfilter/nf_conntrack_helper.h>
38 #include <net/netfilter/nf_conntrack_l3proto.h>
39 #include <net/netfilter/nf_conntrack_l4proto.h>
40 #include <net/netfilter/nf_conntrack_tuple.h>
41 #include <net/netfilter/nf_conntrack_acct.h>
42 #ifdef CONFIG_NF_NAT_NEEDED
43 #include <net/netfilter/nf_nat_core.h>
44 #include <net/netfilter/nf_nat_protocol.h>
45 #endif
46
47 #include <linux/netfilter/nfnetlink.h>
48 #include <linux/netfilter/nfnetlink_conntrack.h>
49
50 MODULE_LICENSE("GPL");
51
52 static char __initdata version[] = "0.93";
53
54 static inline int
55 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
56 const struct nf_conntrack_tuple *tuple,
57 struct nf_conntrack_l4proto *l4proto)
58 {
59 int ret = 0;
60 struct nlattr *nest_parms;
61
62 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
63 if (!nest_parms)
64 goto nla_put_failure;
65 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
66
67 if (likely(l4proto->tuple_to_nlattr))
68 ret = l4proto->tuple_to_nlattr(skb, tuple);
69
70 nla_nest_end(skb, nest_parms);
71
72 return ret;
73
74 nla_put_failure:
75 return -1;
76 }
77
78 static inline int
79 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
80 const struct nf_conntrack_tuple *tuple,
81 struct nf_conntrack_l3proto *l3proto)
82 {
83 int ret = 0;
84 struct nlattr *nest_parms;
85
86 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
87 if (!nest_parms)
88 goto nla_put_failure;
89
90 if (likely(l3proto->tuple_to_nlattr))
91 ret = l3proto->tuple_to_nlattr(skb, tuple);
92
93 nla_nest_end(skb, nest_parms);
94
95 return ret;
96
97 nla_put_failure:
98 return -1;
99 }
100
101 static int
102 ctnetlink_dump_tuples(struct sk_buff *skb,
103 const struct nf_conntrack_tuple *tuple)
104 {
105 int ret;
106 struct nf_conntrack_l3proto *l3proto;
107 struct nf_conntrack_l4proto *l4proto;
108
109 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
110 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
111
112 if (unlikely(ret < 0))
113 return ret;
114
115 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
116 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
117
118 return ret;
119 }
120
121 static inline int
122 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
123 {
124 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
125 return 0;
126
127 nla_put_failure:
128 return -1;
129 }
130
131 static inline int
132 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
133 {
134 long timeout = (ct->timeout.expires - jiffies) / HZ;
135
136 if (timeout < 0)
137 timeout = 0;
138
139 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
140 return 0;
141
142 nla_put_failure:
143 return -1;
144 }
145
146 static inline int
147 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
148 {
149 struct nf_conntrack_l4proto *l4proto;
150 struct nlattr *nest_proto;
151 int ret;
152
153 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
154 if (!l4proto->to_nlattr)
155 return 0;
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 nla_nest_end(skb, nest_proto);
164
165 return ret;
166
167 nla_put_failure:
168 return -1;
169 }
170
171 static inline int
172 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
173 {
174 struct nlattr *nest_helper;
175 const struct nf_conn_help *help = nfct_help(ct);
176 struct nf_conntrack_helper *helper;
177
178 if (!help)
179 return 0;
180
181 helper = rcu_dereference(help->helper);
182 if (!helper)
183 goto out;
184
185 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
186 if (!nest_helper)
187 goto nla_put_failure;
188 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
189
190 if (helper->to_nlattr)
191 helper->to_nlattr(skb, ct);
192
193 nla_nest_end(skb, nest_helper);
194 out:
195 return 0;
196
197 nla_put_failure:
198 return -1;
199 }
200
201 static int
202 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
203 enum ip_conntrack_dir dir)
204 {
205 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
206 struct nlattr *nest_count;
207 const struct nf_conn_counter *acct;
208
209 acct = nf_conn_acct_find(ct);
210 if (!acct)
211 return 0;
212
213 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
214 if (!nest_count)
215 goto nla_put_failure;
216
217 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
218 cpu_to_be64(acct[dir].packets));
219 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
220 cpu_to_be64(acct[dir].bytes));
221
222 nla_nest_end(skb, nest_count);
223
224 return 0;
225
226 nla_put_failure:
227 return -1;
228 }
229
230 #ifdef CONFIG_NF_CONNTRACK_MARK
231 static inline int
232 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
233 {
234 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
235 return 0;
236
237 nla_put_failure:
238 return -1;
239 }
240 #else
241 #define ctnetlink_dump_mark(a, b) (0)
242 #endif
243
244 #ifdef CONFIG_NF_CONNTRACK_SECMARK
245 static inline int
246 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
247 {
248 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
249 return 0;
250
251 nla_put_failure:
252 return -1;
253 }
254 #else
255 #define ctnetlink_dump_secmark(a, b) (0)
256 #endif
257
258 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
259
260 static inline int
261 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
262 {
263 struct nlattr *nest_parms;
264
265 if (!(ct->status & IPS_EXPECTED))
266 return 0;
267
268 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
269 if (!nest_parms)
270 goto nla_put_failure;
271 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
272 goto nla_put_failure;
273 nla_nest_end(skb, nest_parms);
274
275 return 0;
276
277 nla_put_failure:
278 return -1;
279 }
280
281 #ifdef CONFIG_NF_NAT_NEEDED
282 static int
283 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
284 {
285 struct nlattr *nest_parms;
286
287 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
288 if (!nest_parms)
289 goto nla_put_failure;
290
291 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
292 htonl(natseq->correction_pos));
293 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
294 htonl(natseq->offset_before));
295 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
296 htonl(natseq->offset_after));
297
298 nla_nest_end(skb, nest_parms);
299
300 return 0;
301
302 nla_put_failure:
303 return -1;
304 }
305
306 static inline int
307 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
308 {
309 struct nf_nat_seq *natseq;
310 struct nf_conn_nat *nat = nfct_nat(ct);
311
312 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
313 return 0;
314
315 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
316 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
317 return -1;
318
319 natseq = &nat->seq[IP_CT_DIR_REPLY];
320 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
321 return -1;
322
323 return 0;
324 }
325 #else
326 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
327 #endif
328
329 static inline int
330 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
331 {
332 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
333 return 0;
334
335 nla_put_failure:
336 return -1;
337 }
338
339 static inline int
340 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
341 {
342 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
343 return 0;
344
345 nla_put_failure:
346 return -1;
347 }
348
349 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
350
351 static int
352 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
353 int event, int nowait,
354 const struct nf_conn *ct)
355 {
356 struct nlmsghdr *nlh;
357 struct nfgenmsg *nfmsg;
358 struct nlattr *nest_parms;
359 unsigned char *b = skb_tail_pointer(skb);
360
361 event |= NFNL_SUBSYS_CTNETLINK << 8;
362 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
363 nfmsg = NLMSG_DATA(nlh);
364
365 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
366 nfmsg->nfgen_family = nf_ct_l3num(ct);
367 nfmsg->version = NFNETLINK_V0;
368 nfmsg->res_id = 0;
369
370 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
371 if (!nest_parms)
372 goto nla_put_failure;
373 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
374 goto nla_put_failure;
375 nla_nest_end(skb, nest_parms);
376
377 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
378 if (!nest_parms)
379 goto nla_put_failure;
380 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
381 goto nla_put_failure;
382 nla_nest_end(skb, nest_parms);
383
384 if (ctnetlink_dump_status(skb, ct) < 0 ||
385 ctnetlink_dump_timeout(skb, ct) < 0 ||
386 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
387 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
388 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
389 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
390 ctnetlink_dump_mark(skb, ct) < 0 ||
391 ctnetlink_dump_secmark(skb, ct) < 0 ||
392 ctnetlink_dump_id(skb, ct) < 0 ||
393 ctnetlink_dump_use(skb, ct) < 0 ||
394 ctnetlink_dump_master(skb, ct) < 0 ||
395 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
396 goto nla_put_failure;
397
398 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
399 return skb->len;
400
401 nlmsg_failure:
402 nla_put_failure:
403 nlmsg_trim(skb, b);
404 return -1;
405 }
406
407 #ifdef CONFIG_NF_CONNTRACK_EVENTS
408 static int ctnetlink_conntrack_event(struct notifier_block *this,
409 unsigned long events, void *ptr)
410 {
411 struct nlmsghdr *nlh;
412 struct nfgenmsg *nfmsg;
413 struct nlattr *nest_parms;
414 struct nf_ct_event *item = (struct nf_ct_event *)ptr;
415 struct nf_conn *ct = item->ct;
416 struct sk_buff *skb;
417 unsigned int type;
418 sk_buff_data_t b;
419 unsigned int flags = 0, group;
420
421 /* ignore our fake conntrack entry */
422 if (ct == &nf_conntrack_untracked)
423 return NOTIFY_DONE;
424
425 if (events & IPCT_DESTROY) {
426 type = IPCTNL_MSG_CT_DELETE;
427 group = NFNLGRP_CONNTRACK_DESTROY;
428 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
429 type = IPCTNL_MSG_CT_NEW;
430 flags = NLM_F_CREATE|NLM_F_EXCL;
431 group = NFNLGRP_CONNTRACK_NEW;
432 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
433 type = IPCTNL_MSG_CT_NEW;
434 group = NFNLGRP_CONNTRACK_UPDATE;
435 } else
436 return NOTIFY_DONE;
437
438 if (!item->report && !nfnetlink_has_listeners(group))
439 return NOTIFY_DONE;
440
441 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
442 if (!skb)
443 return NOTIFY_DONE;
444
445 b = skb->tail;
446
447 type |= NFNL_SUBSYS_CTNETLINK << 8;
448 nlh = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
449 nfmsg = NLMSG_DATA(nlh);
450
451 nlh->nlmsg_flags = flags;
452 nfmsg->nfgen_family = nf_ct_l3num(ct);
453 nfmsg->version = NFNETLINK_V0;
454 nfmsg->res_id = 0;
455
456 rcu_read_lock();
457 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
458 if (!nest_parms)
459 goto nla_put_failure;
460 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
461 goto nla_put_failure;
462 nla_nest_end(skb, nest_parms);
463
464 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
465 if (!nest_parms)
466 goto nla_put_failure;
467 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
468 goto nla_put_failure;
469 nla_nest_end(skb, nest_parms);
470
471 if (ctnetlink_dump_id(skb, ct) < 0)
472 goto nla_put_failure;
473
474 if (ctnetlink_dump_status(skb, ct) < 0)
475 goto nla_put_failure;
476
477 if (events & IPCT_DESTROY) {
478 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
479 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
480 goto nla_put_failure;
481 } else {
482 if (ctnetlink_dump_timeout(skb, ct) < 0)
483 goto nla_put_failure;
484
485 if (events & IPCT_PROTOINFO
486 && ctnetlink_dump_protoinfo(skb, ct) < 0)
487 goto nla_put_failure;
488
489 if ((events & IPCT_HELPER || nfct_help(ct))
490 && ctnetlink_dump_helpinfo(skb, ct) < 0)
491 goto nla_put_failure;
492
493 #ifdef CONFIG_NF_CONNTRACK_SECMARK
494 if ((events & IPCT_SECMARK || ct->secmark)
495 && ctnetlink_dump_secmark(skb, ct) < 0)
496 goto nla_put_failure;
497 #endif
498
499 if (events & IPCT_RELATED &&
500 ctnetlink_dump_master(skb, ct) < 0)
501 goto nla_put_failure;
502
503 if (events & IPCT_NATSEQADJ &&
504 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
505 goto nla_put_failure;
506 }
507
508 #ifdef CONFIG_NF_CONNTRACK_MARK
509 if ((events & IPCT_MARK || ct->mark)
510 && ctnetlink_dump_mark(skb, ct) < 0)
511 goto nla_put_failure;
512 #endif
513 rcu_read_unlock();
514
515 nlh->nlmsg_len = skb->tail - b;
516 nfnetlink_send(skb, item->pid, group, item->report);
517 return NOTIFY_DONE;
518
519 nla_put_failure:
520 rcu_read_unlock();
521 nlmsg_failure:
522 nfnetlink_set_err(0, group, -ENOBUFS);
523 kfree_skb(skb);
524 return NOTIFY_DONE;
525 }
526 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
527
528 static int ctnetlink_done(struct netlink_callback *cb)
529 {
530 if (cb->args[1])
531 nf_ct_put((struct nf_conn *)cb->args[1]);
532 return 0;
533 }
534
535 static int
536 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
537 {
538 struct nf_conn *ct, *last;
539 struct nf_conntrack_tuple_hash *h;
540 struct hlist_nulls_node *n;
541 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
542 u_int8_t l3proto = nfmsg->nfgen_family;
543
544 rcu_read_lock();
545 last = (struct nf_conn *)cb->args[1];
546 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
547 restart:
548 hlist_nulls_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
549 hnnode) {
550 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
551 continue;
552 ct = nf_ct_tuplehash_to_ctrack(h);
553 if (!atomic_inc_not_zero(&ct->ct_general.use))
554 continue;
555 /* Dump entries of a given L3 protocol number.
556 * If it is not specified, ie. l3proto == 0,
557 * then dump everything. */
558 if (l3proto && nf_ct_l3num(ct) != l3proto)
559 goto releasect;
560 if (cb->args[1]) {
561 if (ct != last)
562 goto releasect;
563 cb->args[1] = 0;
564 }
565 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
566 cb->nlh->nlmsg_seq,
567 IPCTNL_MSG_CT_NEW,
568 1, ct) < 0) {
569 cb->args[1] = (unsigned long)ct;
570 goto out;
571 }
572
573 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
574 IPCTNL_MSG_CT_GET_CTRZERO) {
575 struct nf_conn_counter *acct;
576
577 acct = nf_conn_acct_find(ct);
578 if (acct)
579 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
580 }
581 releasect:
582 nf_ct_put(ct);
583 }
584 if (cb->args[1]) {
585 cb->args[1] = 0;
586 goto restart;
587 }
588 }
589 out:
590 rcu_read_unlock();
591 if (last)
592 nf_ct_put(last);
593
594 return skb->len;
595 }
596
597 static inline int
598 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
599 {
600 struct nlattr *tb[CTA_IP_MAX+1];
601 struct nf_conntrack_l3proto *l3proto;
602 int ret = 0;
603
604 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
605
606 rcu_read_lock();
607 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
608
609 if (likely(l3proto->nlattr_to_tuple)) {
610 ret = nla_validate_nested(attr, CTA_IP_MAX,
611 l3proto->nla_policy);
612 if (ret == 0)
613 ret = l3proto->nlattr_to_tuple(tb, tuple);
614 }
615
616 rcu_read_unlock();
617
618 return ret;
619 }
620
621 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
622 [CTA_PROTO_NUM] = { .type = NLA_U8 },
623 };
624
625 static inline int
626 ctnetlink_parse_tuple_proto(struct nlattr *attr,
627 struct nf_conntrack_tuple *tuple)
628 {
629 struct nlattr *tb[CTA_PROTO_MAX+1];
630 struct nf_conntrack_l4proto *l4proto;
631 int ret = 0;
632
633 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
634 if (ret < 0)
635 return ret;
636
637 if (!tb[CTA_PROTO_NUM])
638 return -EINVAL;
639 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
640
641 rcu_read_lock();
642 l4proto = __nf_ct_l4proto_find(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 rcu_read_unlock();
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 static inline int
693 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
694 {
695 struct nlattr *tb[CTA_HELP_MAX+1];
696
697 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
698
699 if (!tb[CTA_HELP_NAME])
700 return -EINVAL;
701
702 *helper_name = nla_data(tb[CTA_HELP_NAME]);
703
704 return 0;
705 }
706
707 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
708 [CTA_STATUS] = { .type = NLA_U32 },
709 [CTA_TIMEOUT] = { .type = NLA_U32 },
710 [CTA_MARK] = { .type = NLA_U32 },
711 [CTA_USE] = { .type = NLA_U32 },
712 [CTA_ID] = { .type = NLA_U32 },
713 };
714
715 static int
716 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
717 struct nlmsghdr *nlh, struct nlattr *cda[])
718 {
719 struct nf_conntrack_tuple_hash *h;
720 struct nf_conntrack_tuple tuple;
721 struct nf_conn *ct;
722 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
723 u_int8_t u3 = nfmsg->nfgen_family;
724 int err = 0;
725
726 if (cda[CTA_TUPLE_ORIG])
727 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
728 else if (cda[CTA_TUPLE_REPLY])
729 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
730 else {
731 /* Flush the whole table */
732 nf_conntrack_flush(&init_net,
733 NETLINK_CB(skb).pid,
734 nlmsg_report(nlh));
735 return 0;
736 }
737
738 if (err < 0)
739 return err;
740
741 h = nf_conntrack_find_get(&init_net, &tuple);
742 if (!h)
743 return -ENOENT;
744
745 ct = nf_ct_tuplehash_to_ctrack(h);
746
747 if (cda[CTA_ID]) {
748 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
749 if (id != (u32)(unsigned long)ct) {
750 nf_ct_put(ct);
751 return -ENOENT;
752 }
753 }
754
755 nf_conntrack_event_report(IPCT_DESTROY,
756 ct,
757 NETLINK_CB(skb).pid,
758 nlmsg_report(nlh));
759
760 /* death_by_timeout would report the event again */
761 set_bit(IPS_DYING_BIT, &ct->status);
762
763 nf_ct_kill(ct);
764 nf_ct_put(ct);
765
766 return 0;
767 }
768
769 static int
770 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
771 struct nlmsghdr *nlh, struct nlattr *cda[])
772 {
773 struct nf_conntrack_tuple_hash *h;
774 struct nf_conntrack_tuple tuple;
775 struct nf_conn *ct;
776 struct sk_buff *skb2 = NULL;
777 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
778 u_int8_t u3 = nfmsg->nfgen_family;
779 int err = 0;
780
781 if (nlh->nlmsg_flags & NLM_F_DUMP)
782 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
783 ctnetlink_done);
784
785 if (cda[CTA_TUPLE_ORIG])
786 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
787 else if (cda[CTA_TUPLE_REPLY])
788 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
789 else
790 return -EINVAL;
791
792 if (err < 0)
793 return err;
794
795 h = nf_conntrack_find_get(&init_net, &tuple);
796 if (!h)
797 return -ENOENT;
798
799 ct = nf_ct_tuplehash_to_ctrack(h);
800
801 err = -ENOMEM;
802 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
803 if (!skb2) {
804 nf_ct_put(ct);
805 return -ENOMEM;
806 }
807
808 rcu_read_lock();
809 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
810 IPCTNL_MSG_CT_NEW, 1, ct);
811 rcu_read_unlock();
812 nf_ct_put(ct);
813 if (err <= 0)
814 goto free;
815
816 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
817 if (err < 0)
818 goto out;
819
820 return 0;
821
822 free:
823 kfree_skb(skb2);
824 out:
825 return err;
826 }
827
828 #ifdef CONFIG_NF_NAT_NEEDED
829 static int
830 ctnetlink_parse_nat_setup(struct nf_conn *ct,
831 enum nf_nat_manip_type manip,
832 struct nlattr *attr)
833 {
834 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
835
836 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
837 if (!parse_nat_setup) {
838 #ifdef CONFIG_MODULES
839 rcu_read_unlock();
840 spin_unlock_bh(&nf_conntrack_lock);
841 nfnl_unlock();
842 if (request_module("nf-nat-ipv4") < 0) {
843 nfnl_lock();
844 spin_lock_bh(&nf_conntrack_lock);
845 rcu_read_lock();
846 return -EOPNOTSUPP;
847 }
848 nfnl_lock();
849 spin_lock_bh(&nf_conntrack_lock);
850 rcu_read_lock();
851 if (nfnetlink_parse_nat_setup_hook)
852 return -EAGAIN;
853 #endif
854 return -EOPNOTSUPP;
855 }
856
857 return parse_nat_setup(ct, manip, attr);
858 }
859 #endif
860
861 static int
862 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
863 {
864 unsigned long d;
865 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
866 d = ct->status ^ status;
867
868 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
869 /* unchangeable */
870 return -EBUSY;
871
872 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
873 /* SEEN_REPLY bit can only be set */
874 return -EBUSY;
875
876 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
877 /* ASSURED bit can only be set */
878 return -EBUSY;
879
880 /* Be careful here, modifying NAT bits can screw up things,
881 * so don't let users modify them directly if they don't pass
882 * nf_nat_range. */
883 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
884 return 0;
885 }
886
887 static int
888 ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[])
889 {
890 #ifdef CONFIG_NF_NAT_NEEDED
891 int ret;
892
893 if (cda[CTA_NAT_DST]) {
894 ret = ctnetlink_parse_nat_setup(ct,
895 IP_NAT_MANIP_DST,
896 cda[CTA_NAT_DST]);
897 if (ret < 0)
898 return ret;
899 }
900 if (cda[CTA_NAT_SRC]) {
901 ret = ctnetlink_parse_nat_setup(ct,
902 IP_NAT_MANIP_SRC,
903 cda[CTA_NAT_SRC]);
904 if (ret < 0)
905 return ret;
906 }
907 return 0;
908 #else
909 return -EOPNOTSUPP;
910 #endif
911 }
912
913 static inline int
914 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
915 {
916 struct nf_conntrack_helper *helper;
917 struct nf_conn_help *help = nfct_help(ct);
918 char *helpname;
919 int err;
920
921 /* don't change helper of sibling connections */
922 if (ct->master)
923 return -EBUSY;
924
925 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
926 if (err < 0)
927 return err;
928
929 if (!strcmp(helpname, "")) {
930 if (help && help->helper) {
931 /* we had a helper before ... */
932 nf_ct_remove_expectations(ct);
933 rcu_assign_pointer(help->helper, NULL);
934 }
935
936 return 0;
937 }
938
939 helper = __nf_conntrack_helper_find_byname(helpname);
940 if (helper == NULL) {
941 #ifdef CONFIG_MODULES
942 spin_unlock_bh(&nf_conntrack_lock);
943
944 if (request_module("nfct-helper-%s", helpname) < 0) {
945 spin_lock_bh(&nf_conntrack_lock);
946 return -EOPNOTSUPP;
947 }
948
949 spin_lock_bh(&nf_conntrack_lock);
950 helper = __nf_conntrack_helper_find_byname(helpname);
951 if (helper)
952 return -EAGAIN;
953 #endif
954 return -EOPNOTSUPP;
955 }
956
957 if (help) {
958 if (help->helper == helper)
959 return 0;
960 if (help->helper)
961 return -EBUSY;
962 /* need to zero data of old helper */
963 memset(&help->help, 0, sizeof(help->help));
964 } else {
965 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
966 if (help == NULL)
967 return -ENOMEM;
968 }
969
970 rcu_assign_pointer(help->helper, helper);
971
972 return 0;
973 }
974
975 static inline int
976 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
977 {
978 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
979
980 if (!del_timer(&ct->timeout))
981 return -ETIME;
982
983 ct->timeout.expires = jiffies + timeout * HZ;
984 add_timer(&ct->timeout);
985
986 return 0;
987 }
988
989 static inline int
990 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
991 {
992 struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
993 struct nf_conntrack_l4proto *l4proto;
994 int err = 0;
995
996 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
997
998 rcu_read_lock();
999 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1000 if (l4proto->from_nlattr)
1001 err = l4proto->from_nlattr(tb, ct);
1002 rcu_read_unlock();
1003
1004 return err;
1005 }
1006
1007 #ifdef CONFIG_NF_NAT_NEEDED
1008 static inline int
1009 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1010 {
1011 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1012
1013 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1014
1015 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1016 return -EINVAL;
1017
1018 natseq->correction_pos =
1019 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1020
1021 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1022 return -EINVAL;
1023
1024 natseq->offset_before =
1025 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1026
1027 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1028 return -EINVAL;
1029
1030 natseq->offset_after =
1031 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1032
1033 return 0;
1034 }
1035
1036 static int
1037 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1038 {
1039 int ret = 0;
1040 struct nf_conn_nat *nat = nfct_nat(ct);
1041
1042 if (!nat)
1043 return 0;
1044
1045 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1046 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1047 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1048 if (ret < 0)
1049 return ret;
1050
1051 ct->status |= IPS_SEQ_ADJUST;
1052 }
1053
1054 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1055 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1056 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1057 if (ret < 0)
1058 return ret;
1059
1060 ct->status |= IPS_SEQ_ADJUST;
1061 }
1062
1063 return 0;
1064 }
1065 #endif
1066
1067 static int
1068 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1069 {
1070 int err;
1071
1072 /* only allow NAT changes and master assignation for new conntracks */
1073 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1074 return -EOPNOTSUPP;
1075
1076 if (cda[CTA_HELP]) {
1077 err = ctnetlink_change_helper(ct, cda);
1078 if (err < 0)
1079 return err;
1080 }
1081
1082 if (cda[CTA_TIMEOUT]) {
1083 err = ctnetlink_change_timeout(ct, cda);
1084 if (err < 0)
1085 return err;
1086 }
1087
1088 if (cda[CTA_STATUS]) {
1089 err = ctnetlink_change_status(ct, cda);
1090 if (err < 0)
1091 return err;
1092 }
1093
1094 if (cda[CTA_PROTOINFO]) {
1095 err = ctnetlink_change_protoinfo(ct, cda);
1096 if (err < 0)
1097 return err;
1098 }
1099
1100 #if defined(CONFIG_NF_CONNTRACK_MARK)
1101 if (cda[CTA_MARK])
1102 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1103 #endif
1104
1105 #ifdef CONFIG_NF_NAT_NEEDED
1106 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1107 err = ctnetlink_change_nat_seq_adj(ct, cda);
1108 if (err < 0)
1109 return err;
1110 }
1111 #endif
1112
1113 return 0;
1114 }
1115
1116 static inline void
1117 ctnetlink_event_report(struct nf_conn *ct, u32 pid, int report)
1118 {
1119 unsigned int events = 0;
1120
1121 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1122 events |= IPCT_RELATED;
1123 else
1124 events |= IPCT_NEW;
1125
1126 nf_conntrack_event_report(IPCT_STATUS |
1127 IPCT_HELPER |
1128 IPCT_REFRESH |
1129 IPCT_PROTOINFO |
1130 IPCT_NATSEQADJ |
1131 IPCT_MARK |
1132 events,
1133 ct,
1134 pid,
1135 report);
1136 }
1137
1138 static struct nf_conn *
1139 ctnetlink_create_conntrack(struct nlattr *cda[],
1140 struct nf_conntrack_tuple *otuple,
1141 struct nf_conntrack_tuple *rtuple,
1142 u8 u3)
1143 {
1144 struct nf_conn *ct;
1145 int err = -EINVAL;
1146 struct nf_conntrack_helper *helper;
1147
1148 ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_ATOMIC);
1149 if (IS_ERR(ct))
1150 return ERR_PTR(-ENOMEM);
1151
1152 if (!cda[CTA_TIMEOUT])
1153 goto err1;
1154 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1155
1156 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1157 ct->status |= IPS_CONFIRMED;
1158
1159 rcu_read_lock();
1160 if (cda[CTA_HELP]) {
1161 char *helpname;
1162
1163 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1164 if (err < 0)
1165 goto err2;
1166
1167 helper = __nf_conntrack_helper_find_byname(helpname);
1168 if (helper == NULL) {
1169 rcu_read_unlock();
1170 #ifdef CONFIG_MODULES
1171 if (request_module("nfct-helper-%s", helpname) < 0) {
1172 err = -EOPNOTSUPP;
1173 goto err1;
1174 }
1175
1176 rcu_read_lock();
1177 helper = __nf_conntrack_helper_find_byname(helpname);
1178 if (helper) {
1179 err = -EAGAIN;
1180 goto err2;
1181 }
1182 rcu_read_unlock();
1183 #endif
1184 err = -EOPNOTSUPP;
1185 goto err1;
1186 } else {
1187 struct nf_conn_help *help;
1188
1189 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1190 if (help == NULL) {
1191 err = -ENOMEM;
1192 goto err2;
1193 }
1194
1195 /* not in hash table yet so not strictly necessary */
1196 rcu_assign_pointer(help->helper, helper);
1197 }
1198 } else {
1199 /* try an implicit helper assignation */
1200 err = __nf_ct_try_assign_helper(ct, GFP_ATOMIC);
1201 if (err < 0)
1202 goto err2;
1203 }
1204
1205 if (cda[CTA_STATUS]) {
1206 err = ctnetlink_change_status(ct, cda);
1207 if (err < 0)
1208 goto err2;
1209 }
1210
1211 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1212 err = ctnetlink_change_nat(ct, cda);
1213 if (err < 0)
1214 goto err2;
1215 }
1216
1217 #ifdef CONFIG_NF_NAT_NEEDED
1218 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1219 err = ctnetlink_change_nat_seq_adj(ct, cda);
1220 if (err < 0)
1221 goto err2;
1222 }
1223 #endif
1224
1225 if (cda[CTA_PROTOINFO]) {
1226 err = ctnetlink_change_protoinfo(ct, cda);
1227 if (err < 0)
1228 goto err2;
1229 }
1230
1231 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1232
1233 #if defined(CONFIG_NF_CONNTRACK_MARK)
1234 if (cda[CTA_MARK])
1235 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1236 #endif
1237
1238 /* setup master conntrack: this is a confirmed expectation */
1239 if (cda[CTA_TUPLE_MASTER]) {
1240 struct nf_conntrack_tuple master;
1241 struct nf_conntrack_tuple_hash *master_h;
1242 struct nf_conn *master_ct;
1243
1244 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1245 if (err < 0)
1246 goto err2;
1247
1248 master_h = nf_conntrack_find_get(&init_net, &master);
1249 if (master_h == NULL) {
1250 err = -ENOENT;
1251 goto err2;
1252 }
1253 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1254 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1255 ct->master = master_ct;
1256 }
1257
1258 add_timer(&ct->timeout);
1259 nf_conntrack_hash_insert(ct);
1260 rcu_read_unlock();
1261
1262 return ct;
1263
1264 err2:
1265 rcu_read_unlock();
1266 err1:
1267 nf_conntrack_free(ct);
1268 return ERR_PTR(err);
1269 }
1270
1271 static int
1272 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1273 struct nlmsghdr *nlh, struct nlattr *cda[])
1274 {
1275 struct nf_conntrack_tuple otuple, rtuple;
1276 struct nf_conntrack_tuple_hash *h = NULL;
1277 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1278 u_int8_t u3 = nfmsg->nfgen_family;
1279 int err = 0;
1280
1281 if (cda[CTA_TUPLE_ORIG]) {
1282 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1283 if (err < 0)
1284 return err;
1285 }
1286
1287 if (cda[CTA_TUPLE_REPLY]) {
1288 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1289 if (err < 0)
1290 return err;
1291 }
1292
1293 spin_lock_bh(&nf_conntrack_lock);
1294 if (cda[CTA_TUPLE_ORIG])
1295 h = __nf_conntrack_find(&init_net, &otuple);
1296 else if (cda[CTA_TUPLE_REPLY])
1297 h = __nf_conntrack_find(&init_net, &rtuple);
1298
1299 if (h == NULL) {
1300 err = -ENOENT;
1301 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1302 struct nf_conn *ct;
1303
1304 ct = ctnetlink_create_conntrack(cda, &otuple,
1305 &rtuple, u3);
1306 if (IS_ERR(ct)) {
1307 err = PTR_ERR(ct);
1308 goto out_unlock;
1309 }
1310 err = 0;
1311 nf_conntrack_get(&ct->ct_general);
1312 spin_unlock_bh(&nf_conntrack_lock);
1313 ctnetlink_event_report(ct,
1314 NETLINK_CB(skb).pid,
1315 nlmsg_report(nlh));
1316 nf_ct_put(ct);
1317 } else
1318 spin_unlock_bh(&nf_conntrack_lock);
1319
1320 return err;
1321 }
1322 /* implicit 'else' */
1323
1324 /* We manipulate the conntrack inside the global conntrack table lock,
1325 * so there's no need to increase the refcount */
1326 err = -EEXIST;
1327 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1328 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1329
1330 err = ctnetlink_change_conntrack(ct, cda);
1331 if (err == 0) {
1332 nf_conntrack_get(&ct->ct_general);
1333 spin_unlock_bh(&nf_conntrack_lock);
1334 ctnetlink_event_report(ct,
1335 NETLINK_CB(skb).pid,
1336 nlmsg_report(nlh));
1337 nf_ct_put(ct);
1338 } else
1339 spin_unlock_bh(&nf_conntrack_lock);
1340
1341 return err;
1342 }
1343
1344 out_unlock:
1345 spin_unlock_bh(&nf_conntrack_lock);
1346 return err;
1347 }
1348
1349 /***********************************************************************
1350 * EXPECT
1351 ***********************************************************************/
1352
1353 static inline int
1354 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1355 const struct nf_conntrack_tuple *tuple,
1356 enum ctattr_expect type)
1357 {
1358 struct nlattr *nest_parms;
1359
1360 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1361 if (!nest_parms)
1362 goto nla_put_failure;
1363 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1364 goto nla_put_failure;
1365 nla_nest_end(skb, nest_parms);
1366
1367 return 0;
1368
1369 nla_put_failure:
1370 return -1;
1371 }
1372
1373 static inline int
1374 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1375 const struct nf_conntrack_tuple *tuple,
1376 const struct nf_conntrack_tuple_mask *mask)
1377 {
1378 int ret;
1379 struct nf_conntrack_l3proto *l3proto;
1380 struct nf_conntrack_l4proto *l4proto;
1381 struct nf_conntrack_tuple m;
1382 struct nlattr *nest_parms;
1383
1384 memset(&m, 0xFF, sizeof(m));
1385 m.src.u.all = mask->src.u.all;
1386 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1387
1388 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1389 if (!nest_parms)
1390 goto nla_put_failure;
1391
1392 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1393 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1394
1395 if (unlikely(ret < 0))
1396 goto nla_put_failure;
1397
1398 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1399 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1400 if (unlikely(ret < 0))
1401 goto nla_put_failure;
1402
1403 nla_nest_end(skb, nest_parms);
1404
1405 return 0;
1406
1407 nla_put_failure:
1408 return -1;
1409 }
1410
1411 static int
1412 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1413 const struct nf_conntrack_expect *exp)
1414 {
1415 struct nf_conn *master = exp->master;
1416 long timeout = (exp->timeout.expires - jiffies) / HZ;
1417
1418 if (timeout < 0)
1419 timeout = 0;
1420
1421 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1422 goto nla_put_failure;
1423 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1424 goto nla_put_failure;
1425 if (ctnetlink_exp_dump_tuple(skb,
1426 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1427 CTA_EXPECT_MASTER) < 0)
1428 goto nla_put_failure;
1429
1430 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1431 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1432
1433 return 0;
1434
1435 nla_put_failure:
1436 return -1;
1437 }
1438
1439 static int
1440 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1441 int event,
1442 int nowait,
1443 const struct nf_conntrack_expect *exp)
1444 {
1445 struct nlmsghdr *nlh;
1446 struct nfgenmsg *nfmsg;
1447 unsigned char *b = skb_tail_pointer(skb);
1448
1449 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1450 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1451 nfmsg = NLMSG_DATA(nlh);
1452
1453 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1454 nfmsg->nfgen_family = exp->tuple.src.l3num;
1455 nfmsg->version = NFNETLINK_V0;
1456 nfmsg->res_id = 0;
1457
1458 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1459 goto nla_put_failure;
1460
1461 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1462 return skb->len;
1463
1464 nlmsg_failure:
1465 nla_put_failure:
1466 nlmsg_trim(skb, b);
1467 return -1;
1468 }
1469
1470 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1471 static int ctnetlink_expect_event(struct notifier_block *this,
1472 unsigned long events, void *ptr)
1473 {
1474 struct nlmsghdr *nlh;
1475 struct nfgenmsg *nfmsg;
1476 struct nf_exp_event *item = (struct nf_exp_event *)ptr;
1477 struct nf_conntrack_expect *exp = item->exp;
1478 struct sk_buff *skb;
1479 unsigned int type;
1480 sk_buff_data_t b;
1481 int flags = 0;
1482
1483 if (events & IPEXP_NEW) {
1484 type = IPCTNL_MSG_EXP_NEW;
1485 flags = NLM_F_CREATE|NLM_F_EXCL;
1486 } else
1487 return NOTIFY_DONE;
1488
1489 if (!item->report &&
1490 !nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1491 return NOTIFY_DONE;
1492
1493 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1494 if (!skb)
1495 return NOTIFY_DONE;
1496
1497 b = skb->tail;
1498
1499 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1500 nlh = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
1501 nfmsg = NLMSG_DATA(nlh);
1502
1503 nlh->nlmsg_flags = flags;
1504 nfmsg->nfgen_family = exp->tuple.src.l3num;
1505 nfmsg->version = NFNETLINK_V0;
1506 nfmsg->res_id = 0;
1507
1508 rcu_read_lock();
1509 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1510 goto nla_put_failure;
1511 rcu_read_unlock();
1512
1513 nlh->nlmsg_len = skb->tail - b;
1514 nfnetlink_send(skb, item->pid, NFNLGRP_CONNTRACK_EXP_NEW, item->report);
1515 return NOTIFY_DONE;
1516
1517 nla_put_failure:
1518 rcu_read_unlock();
1519 nlmsg_failure:
1520 nfnetlink_set_err(0, 0, -ENOBUFS);
1521 kfree_skb(skb);
1522 return NOTIFY_DONE;
1523 }
1524 #endif
1525 static int ctnetlink_exp_done(struct netlink_callback *cb)
1526 {
1527 if (cb->args[1])
1528 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1529 return 0;
1530 }
1531
1532 static int
1533 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1534 {
1535 struct net *net = &init_net;
1536 struct nf_conntrack_expect *exp, *last;
1537 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1538 struct hlist_node *n;
1539 u_int8_t l3proto = nfmsg->nfgen_family;
1540
1541 rcu_read_lock();
1542 last = (struct nf_conntrack_expect *)cb->args[1];
1543 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1544 restart:
1545 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1546 hnode) {
1547 if (l3proto && exp->tuple.src.l3num != l3proto)
1548 continue;
1549 if (cb->args[1]) {
1550 if (exp != last)
1551 continue;
1552 cb->args[1] = 0;
1553 }
1554 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1555 cb->nlh->nlmsg_seq,
1556 IPCTNL_MSG_EXP_NEW,
1557 1, exp) < 0) {
1558 if (!atomic_inc_not_zero(&exp->use))
1559 continue;
1560 cb->args[1] = (unsigned long)exp;
1561 goto out;
1562 }
1563 }
1564 if (cb->args[1]) {
1565 cb->args[1] = 0;
1566 goto restart;
1567 }
1568 }
1569 out:
1570 rcu_read_unlock();
1571 if (last)
1572 nf_ct_expect_put(last);
1573
1574 return skb->len;
1575 }
1576
1577 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1578 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1579 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1580 };
1581
1582 static int
1583 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1584 struct nlmsghdr *nlh, struct nlattr *cda[])
1585 {
1586 struct nf_conntrack_tuple tuple;
1587 struct nf_conntrack_expect *exp;
1588 struct sk_buff *skb2;
1589 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1590 u_int8_t u3 = nfmsg->nfgen_family;
1591 int err = 0;
1592
1593 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1594 return netlink_dump_start(ctnl, skb, nlh,
1595 ctnetlink_exp_dump_table,
1596 ctnetlink_exp_done);
1597 }
1598
1599 if (cda[CTA_EXPECT_MASTER])
1600 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1601 else
1602 return -EINVAL;
1603
1604 if (err < 0)
1605 return err;
1606
1607 exp = nf_ct_expect_find_get(&init_net, &tuple);
1608 if (!exp)
1609 return -ENOENT;
1610
1611 if (cda[CTA_EXPECT_ID]) {
1612 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1613 if (ntohl(id) != (u32)(unsigned long)exp) {
1614 nf_ct_expect_put(exp);
1615 return -ENOENT;
1616 }
1617 }
1618
1619 err = -ENOMEM;
1620 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1621 if (!skb2)
1622 goto out;
1623
1624 rcu_read_lock();
1625 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1626 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1627 1, exp);
1628 rcu_read_unlock();
1629 if (err <= 0)
1630 goto free;
1631
1632 nf_ct_expect_put(exp);
1633
1634 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1635
1636 free:
1637 kfree_skb(skb2);
1638 out:
1639 nf_ct_expect_put(exp);
1640 return err;
1641 }
1642
1643 static int
1644 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1645 struct nlmsghdr *nlh, struct nlattr *cda[])
1646 {
1647 struct nf_conntrack_expect *exp;
1648 struct nf_conntrack_tuple tuple;
1649 struct nf_conntrack_helper *h;
1650 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1651 struct hlist_node *n, *next;
1652 u_int8_t u3 = nfmsg->nfgen_family;
1653 unsigned int i;
1654 int err;
1655
1656 if (cda[CTA_EXPECT_TUPLE]) {
1657 /* delete a single expect by tuple */
1658 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1659 if (err < 0)
1660 return err;
1661
1662 /* bump usage count to 2 */
1663 exp = nf_ct_expect_find_get(&init_net, &tuple);
1664 if (!exp)
1665 return -ENOENT;
1666
1667 if (cda[CTA_EXPECT_ID]) {
1668 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1669 if (ntohl(id) != (u32)(unsigned long)exp) {
1670 nf_ct_expect_put(exp);
1671 return -ENOENT;
1672 }
1673 }
1674
1675 /* after list removal, usage count == 1 */
1676 nf_ct_unexpect_related(exp);
1677 /* have to put what we 'get' above.
1678 * after this line usage count == 0 */
1679 nf_ct_expect_put(exp);
1680 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1681 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1682 struct nf_conn_help *m_help;
1683
1684 /* delete all expectations for this helper */
1685 spin_lock_bh(&nf_conntrack_lock);
1686 h = __nf_conntrack_helper_find_byname(name);
1687 if (!h) {
1688 spin_unlock_bh(&nf_conntrack_lock);
1689 return -EOPNOTSUPP;
1690 }
1691 for (i = 0; i < nf_ct_expect_hsize; i++) {
1692 hlist_for_each_entry_safe(exp, n, next,
1693 &init_net.ct.expect_hash[i],
1694 hnode) {
1695 m_help = nfct_help(exp->master);
1696 if (m_help->helper == h
1697 && del_timer(&exp->timeout)) {
1698 nf_ct_unlink_expect(exp);
1699 nf_ct_expect_put(exp);
1700 }
1701 }
1702 }
1703 spin_unlock_bh(&nf_conntrack_lock);
1704 } else {
1705 /* This basically means we have to flush everything*/
1706 spin_lock_bh(&nf_conntrack_lock);
1707 for (i = 0; i < nf_ct_expect_hsize; i++) {
1708 hlist_for_each_entry_safe(exp, n, next,
1709 &init_net.ct.expect_hash[i],
1710 hnode) {
1711 if (del_timer(&exp->timeout)) {
1712 nf_ct_unlink_expect(exp);
1713 nf_ct_expect_put(exp);
1714 }
1715 }
1716 }
1717 spin_unlock_bh(&nf_conntrack_lock);
1718 }
1719
1720 return 0;
1721 }
1722 static int
1723 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1724 {
1725 return -EOPNOTSUPP;
1726 }
1727
1728 static int
1729 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3, u32 pid, int report)
1730 {
1731 struct nf_conntrack_tuple tuple, mask, master_tuple;
1732 struct nf_conntrack_tuple_hash *h = NULL;
1733 struct nf_conntrack_expect *exp;
1734 struct nf_conn *ct;
1735 struct nf_conn_help *help;
1736 int err = 0;
1737
1738 /* caller guarantees that those three CTA_EXPECT_* exist */
1739 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1740 if (err < 0)
1741 return err;
1742 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1743 if (err < 0)
1744 return err;
1745 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1746 if (err < 0)
1747 return err;
1748
1749 /* Look for master conntrack of this expectation */
1750 h = nf_conntrack_find_get(&init_net, &master_tuple);
1751 if (!h)
1752 return -ENOENT;
1753 ct = nf_ct_tuplehash_to_ctrack(h);
1754 help = nfct_help(ct);
1755
1756 if (!help || !help->helper) {
1757 /* such conntrack hasn't got any helper, abort */
1758 err = -EOPNOTSUPP;
1759 goto out;
1760 }
1761
1762 exp = nf_ct_expect_alloc(ct);
1763 if (!exp) {
1764 err = -ENOMEM;
1765 goto out;
1766 }
1767
1768 exp->expectfn = NULL;
1769 exp->flags = 0;
1770 exp->master = ct;
1771 exp->helper = NULL;
1772 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1773 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1774 exp->mask.src.u.all = mask.src.u.all;
1775
1776 err = nf_ct_expect_related_report(exp, pid, report);
1777 nf_ct_expect_put(exp);
1778
1779 out:
1780 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1781 return err;
1782 }
1783
1784 static int
1785 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1786 struct nlmsghdr *nlh, struct nlattr *cda[])
1787 {
1788 struct nf_conntrack_tuple tuple;
1789 struct nf_conntrack_expect *exp;
1790 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1791 u_int8_t u3 = nfmsg->nfgen_family;
1792 int err = 0;
1793
1794 if (!cda[CTA_EXPECT_TUPLE]
1795 || !cda[CTA_EXPECT_MASK]
1796 || !cda[CTA_EXPECT_MASTER])
1797 return -EINVAL;
1798
1799 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1800 if (err < 0)
1801 return err;
1802
1803 spin_lock_bh(&nf_conntrack_lock);
1804 exp = __nf_ct_expect_find(&init_net, &tuple);
1805
1806 if (!exp) {
1807 spin_unlock_bh(&nf_conntrack_lock);
1808 err = -ENOENT;
1809 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1810 err = ctnetlink_create_expect(cda,
1811 u3,
1812 NETLINK_CB(skb).pid,
1813 nlmsg_report(nlh));
1814 }
1815 return err;
1816 }
1817
1818 err = -EEXIST;
1819 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1820 err = ctnetlink_change_expect(exp, cda);
1821 spin_unlock_bh(&nf_conntrack_lock);
1822
1823 return err;
1824 }
1825
1826 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1827 static struct notifier_block ctnl_notifier = {
1828 .notifier_call = ctnetlink_conntrack_event,
1829 };
1830
1831 static struct notifier_block ctnl_notifier_exp = {
1832 .notifier_call = ctnetlink_expect_event,
1833 };
1834 #endif
1835
1836 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1837 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1838 .attr_count = CTA_MAX,
1839 .policy = ct_nla_policy },
1840 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1841 .attr_count = CTA_MAX,
1842 .policy = ct_nla_policy },
1843 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1844 .attr_count = CTA_MAX,
1845 .policy = ct_nla_policy },
1846 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1847 .attr_count = CTA_MAX,
1848 .policy = ct_nla_policy },
1849 };
1850
1851 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1852 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1853 .attr_count = CTA_EXPECT_MAX,
1854 .policy = exp_nla_policy },
1855 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1856 .attr_count = CTA_EXPECT_MAX,
1857 .policy = exp_nla_policy },
1858 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1859 .attr_count = CTA_EXPECT_MAX,
1860 .policy = exp_nla_policy },
1861 };
1862
1863 static const struct nfnetlink_subsystem ctnl_subsys = {
1864 .name = "conntrack",
1865 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1866 .cb_count = IPCTNL_MSG_MAX,
1867 .cb = ctnl_cb,
1868 };
1869
1870 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1871 .name = "conntrack_expect",
1872 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1873 .cb_count = IPCTNL_MSG_EXP_MAX,
1874 .cb = ctnl_exp_cb,
1875 };
1876
1877 MODULE_ALIAS("ip_conntrack_netlink");
1878 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1879 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1880
1881 static int __init ctnetlink_init(void)
1882 {
1883 int ret;
1884
1885 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1886 ret = nfnetlink_subsys_register(&ctnl_subsys);
1887 if (ret < 0) {
1888 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1889 goto err_out;
1890 }
1891
1892 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1893 if (ret < 0) {
1894 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1895 goto err_unreg_subsys;
1896 }
1897
1898 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1899 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1900 if (ret < 0) {
1901 printk("ctnetlink_init: cannot register notifier.\n");
1902 goto err_unreg_exp_subsys;
1903 }
1904
1905 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1906 if (ret < 0) {
1907 printk("ctnetlink_init: cannot expect register notifier.\n");
1908 goto err_unreg_notifier;
1909 }
1910 #endif
1911
1912 return 0;
1913
1914 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1915 err_unreg_notifier:
1916 nf_conntrack_unregister_notifier(&ctnl_notifier);
1917 err_unreg_exp_subsys:
1918 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1919 #endif
1920 err_unreg_subsys:
1921 nfnetlink_subsys_unregister(&ctnl_subsys);
1922 err_out:
1923 return ret;
1924 }
1925
1926 static void __exit ctnetlink_exit(void)
1927 {
1928 printk("ctnetlink: unregistering from nfnetlink.\n");
1929
1930 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1931 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1932 nf_conntrack_unregister_notifier(&ctnl_notifier);
1933 #endif
1934
1935 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1936 nfnetlink_subsys_unregister(&ctnl_subsys);
1937 return;
1938 }
1939
1940 module_init(ctnetlink_init);
1941 module_exit(ctnetlink_exit);
Linux 2.6 libata-dev (mirror)