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netfilter: xt_cluster: fix use of cluster match with 32 nodes
[deliverable/linux.git] / net / netfilter / nf_conntrack_netlink.c
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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
50MODULE_LICENSE("GPL");
51
52static char __initdata version[] = "0.93";
53
54static inline int
55ctnetlink_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
74nla_put_failure:
75 return -1;
76}
77
78static inline int
79ctnetlink_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
97nla_put_failure:
98 return -1;
99}
100
101static int
102ctnetlink_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
121static inline int
122ctnetlink_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
127nla_put_failure:
128 return -1;
129}
130
131static inline int
132ctnetlink_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
142nla_put_failure:
143 return -1;
144}
145
146static inline int
147ctnetlink_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
167nla_put_failure:
168 return -1;
169}
170
171static inline int
172ctnetlink_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);
194out:
195 return 0;
196
197nla_put_failure:
198 return -1;
199}
200
201static int
202ctnetlink_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
226nla_put_failure:
227 return -1;
228}
229
230#ifdef CONFIG_NF_CONNTRACK_MARK
231static inline int
232ctnetlink_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
237nla_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
245static inline int
246ctnetlink_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
251nla_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
260static inline int
261ctnetlink_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
277nla_put_failure:
278 return -1;
279}
280
281#ifdef CONFIG_NF_NAT_NEEDED
282static int
283dump_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
302nla_put_failure:
303 return -1;
304}
305
306static inline int
307ctnetlink_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
329static inline int
330ctnetlink_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
335nla_put_failure:
336 return -1;
337}
338
339static inline int
340ctnetlink_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
345nla_put_failure:
346 return -1;
347}
348
349#define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
350
351static int
352ctnetlink_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
401nlmsg_failure:
402nla_put_failure:
403 nlmsg_trim(skb, b);
404 return -1;
405}
406
407#ifdef CONFIG_NF_CONNTRACK_EVENTS
408/*
409 * The general structure of a ctnetlink event is
410 *
411 * CTA_TUPLE_ORIG
412 * <l3/l4-proto-attributes>
413 * CTA_TUPLE_REPLY
414 * <l3/l4-proto-attributes>
415 * CTA_ID
416 * ...
417 * CTA_PROTOINFO
418 * <l4-proto-attributes>
419 * CTA_TUPLE_MASTER
420 * <l3/l4-proto-attributes>
421 *
422 * Therefore the formular is
423 *
424 * size = sizeof(headers) + sizeof(generic_nlas) + 3 * sizeof(tuple_nlas)
425 * + sizeof(protoinfo_nlas)
426 */
427static struct sk_buff *
428ctnetlink_alloc_skb(const struct nf_conntrack_tuple *tuple, gfp_t gfp)
429{
430 struct nf_conntrack_l3proto *l3proto;
431 struct nf_conntrack_l4proto *l4proto;
432 int len;
433
434#define NLA_TYPE_SIZE(type) nla_total_size(sizeof(type))
435
436 /* proto independant part */
437 len = NLMSG_SPACE(sizeof(struct nfgenmsg))
438 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
439 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
440 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
441 + 3 * NLA_TYPE_SIZE(u_int8_t) /* CTA_PROTO_NUM */
442 + NLA_TYPE_SIZE(u_int32_t) /* CTA_ID */
443 + NLA_TYPE_SIZE(u_int32_t) /* CTA_STATUS */
444#ifdef CONFIG_NF_CT_ACCT
445 + 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
446 + 2 * NLA_TYPE_SIZE(uint64_t) /* CTA_COUNTERS_PACKETS */
447 + 2 * NLA_TYPE_SIZE(uint64_t) /* CTA_COUNTERS_BYTES */
448#endif
449 + NLA_TYPE_SIZE(u_int32_t) /* CTA_TIMEOUT */
450 + nla_total_size(0) /* CTA_PROTOINFO */
451 + nla_total_size(0) /* CTA_HELP */
452 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
453#ifdef CONFIG_NF_CONNTRACK_SECMARK
454 + NLA_TYPE_SIZE(u_int32_t) /* CTA_SECMARK */
455#endif
456#ifdef CONFIG_NF_NAT_NEEDED
457 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
458 + 2 * NLA_TYPE_SIZE(u_int32_t) /* CTA_NAT_SEQ_CORRECTION_POS */
459 + 2 * NLA_TYPE_SIZE(u_int32_t) /* CTA_NAT_SEQ_CORRECTION_BEFORE */
460 + 2 * NLA_TYPE_SIZE(u_int32_t) /* CTA_NAT_SEQ_CORRECTION_AFTER */
461#endif
462#ifdef CONFIG_NF_CONNTRACK_MARK
463 + NLA_TYPE_SIZE(u_int32_t) /* CTA_MARK */
464#endif
465 ;
466
467#undef NLA_TYPE_SIZE
468
469 rcu_read_lock();
470 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
471 len += l3proto->nla_size;
472
473 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
474 len += l4proto->nla_size;
475 rcu_read_unlock();
476
477 return alloc_skb(len, gfp);
478}
479
480static int ctnetlink_conntrack_event(struct notifier_block *this,
481 unsigned long events, void *ptr)
482{
483 struct nlmsghdr *nlh;
484 struct nfgenmsg *nfmsg;
485 struct nlattr *nest_parms;
486 struct nf_ct_event *item = (struct nf_ct_event *)ptr;
487 struct nf_conn *ct = item->ct;
488 struct sk_buff *skb;
489 unsigned int type;
490 sk_buff_data_t b;
491 unsigned int flags = 0, group;
492
493 /* ignore our fake conntrack entry */
494 if (ct == &nf_conntrack_untracked)
495 return NOTIFY_DONE;
496
497 if (events & IPCT_DESTROY) {
498 type = IPCTNL_MSG_CT_DELETE;
499 group = NFNLGRP_CONNTRACK_DESTROY;
500 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
501 type = IPCTNL_MSG_CT_NEW;
502 flags = NLM_F_CREATE|NLM_F_EXCL;
503 group = NFNLGRP_CONNTRACK_NEW;
504 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
505 type = IPCTNL_MSG_CT_NEW;
506 group = NFNLGRP_CONNTRACK_UPDATE;
507 } else
508 return NOTIFY_DONE;
509
510 if (!item->report && !nfnetlink_has_listeners(group))
511 return NOTIFY_DONE;
512
513 skb = ctnetlink_alloc_skb(tuple(ct, IP_CT_DIR_ORIGINAL), GFP_ATOMIC);
514 if (!skb)
515 goto errout;
516
517 b = skb->tail;
518
519 type |= NFNL_SUBSYS_CTNETLINK << 8;
520 nlh = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
521 nfmsg = NLMSG_DATA(nlh);
522
523 nlh->nlmsg_flags = flags;
524 nfmsg->nfgen_family = nf_ct_l3num(ct);
525 nfmsg->version = NFNETLINK_V0;
526 nfmsg->res_id = 0;
527
528 rcu_read_lock();
529 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
530 if (!nest_parms)
531 goto nla_put_failure;
532 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
533 goto nla_put_failure;
534 nla_nest_end(skb, nest_parms);
535
536 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
537 if (!nest_parms)
538 goto nla_put_failure;
539 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
540 goto nla_put_failure;
541 nla_nest_end(skb, nest_parms);
542
543 if (ctnetlink_dump_id(skb, ct) < 0)
544 goto nla_put_failure;
545
546 if (ctnetlink_dump_status(skb, ct) < 0)
547 goto nla_put_failure;
548
549 if (events & IPCT_DESTROY) {
550 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
551 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
552 goto nla_put_failure;
553 } else {
554 if (ctnetlink_dump_timeout(skb, ct) < 0)
555 goto nla_put_failure;
556
557 if (events & IPCT_PROTOINFO
558 && ctnetlink_dump_protoinfo(skb, ct) < 0)
559 goto nla_put_failure;
560
561 if ((events & IPCT_HELPER || nfct_help(ct))
562 && ctnetlink_dump_helpinfo(skb, ct) < 0)
563 goto nla_put_failure;
564
565#ifdef CONFIG_NF_CONNTRACK_SECMARK
566 if ((events & IPCT_SECMARK || ct->secmark)
567 && ctnetlink_dump_secmark(skb, ct) < 0)
568 goto nla_put_failure;
569#endif
570
571 if (events & IPCT_RELATED &&
572 ctnetlink_dump_master(skb, ct) < 0)
573 goto nla_put_failure;
574
575 if (events & IPCT_NATSEQADJ &&
576 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
577 goto nla_put_failure;
578 }
579
580#ifdef CONFIG_NF_CONNTRACK_MARK
581 if ((events & IPCT_MARK || ct->mark)
582 && ctnetlink_dump_mark(skb, ct) < 0)
583 goto nla_put_failure;
584#endif
585 rcu_read_unlock();
586
587 nlh->nlmsg_len = skb->tail - b;
588 nfnetlink_send(skb, item->pid, group, item->report);
589 return NOTIFY_DONE;
590
591nla_put_failure:
592 rcu_read_unlock();
593nlmsg_failure:
594 kfree_skb(skb);
595errout:
596 nfnetlink_set_err(0, group, -ENOBUFS);
597 return NOTIFY_DONE;
598}
599#endif /* CONFIG_NF_CONNTRACK_EVENTS */
600
601static int ctnetlink_done(struct netlink_callback *cb)
602{
603 if (cb->args[1])
604 nf_ct_put((struct nf_conn *)cb->args[1]);
605 return 0;
606}
607
608static int
609ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
610{
611 struct nf_conn *ct, *last;
612 struct nf_conntrack_tuple_hash *h;
613 struct hlist_nulls_node *n;
614 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
615 u_int8_t l3proto = nfmsg->nfgen_family;
616
617 rcu_read_lock();
618 last = (struct nf_conn *)cb->args[1];
619 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
620restart:
621 hlist_nulls_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
622 hnnode) {
623 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
624 continue;
625 ct = nf_ct_tuplehash_to_ctrack(h);
626 if (!atomic_inc_not_zero(&ct->ct_general.use))
627 continue;
628 /* Dump entries of a given L3 protocol number.
629 * If it is not specified, ie. l3proto == 0,
630 * then dump everything. */
631 if (l3proto && nf_ct_l3num(ct) != l3proto)
632 goto releasect;
633 if (cb->args[1]) {
634 if (ct != last)
635 goto releasect;
636 cb->args[1] = 0;
637 }
638 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
639 cb->nlh->nlmsg_seq,
640 IPCTNL_MSG_CT_NEW,
641 1, ct) < 0) {
642 cb->args[1] = (unsigned long)ct;
643 goto out;
644 }
645
646 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
647 IPCTNL_MSG_CT_GET_CTRZERO) {
648 struct nf_conn_counter *acct;
649
650 acct = nf_conn_acct_find(ct);
651 if (acct)
652 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
653 }
654releasect:
655 nf_ct_put(ct);
656 }
657 if (cb->args[1]) {
658 cb->args[1] = 0;
659 goto restart;
660 }
661 }
662out:
663 rcu_read_unlock();
664 if (last)
665 nf_ct_put(last);
666
667 return skb->len;
668}
669
670static inline int
671ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
672{
673 struct nlattr *tb[CTA_IP_MAX+1];
674 struct nf_conntrack_l3proto *l3proto;
675 int ret = 0;
676
677 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
678
679 rcu_read_lock();
680 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
681
682 if (likely(l3proto->nlattr_to_tuple)) {
683 ret = nla_validate_nested(attr, CTA_IP_MAX,
684 l3proto->nla_policy);
685 if (ret == 0)
686 ret = l3proto->nlattr_to_tuple(tb, tuple);
687 }
688
689 rcu_read_unlock();
690
691 return ret;
692}
693
694static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
695 [CTA_PROTO_NUM] = { .type = NLA_U8 },
696};
697
698static inline int
699ctnetlink_parse_tuple_proto(struct nlattr *attr,
700 struct nf_conntrack_tuple *tuple)
701{
702 struct nlattr *tb[CTA_PROTO_MAX+1];
703 struct nf_conntrack_l4proto *l4proto;
704 int ret = 0;
705
706 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
707 if (ret < 0)
708 return ret;
709
710 if (!tb[CTA_PROTO_NUM])
711 return -EINVAL;
712 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
713
714 rcu_read_lock();
715 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
716
717 if (likely(l4proto->nlattr_to_tuple)) {
718 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
719 l4proto->nla_policy);
720 if (ret == 0)
721 ret = l4proto->nlattr_to_tuple(tb, tuple);
722 }
723
724 rcu_read_unlock();
725
726 return ret;
727}
728
729static int
730ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
731 enum ctattr_tuple type, u_int8_t l3num)
732{
733 struct nlattr *tb[CTA_TUPLE_MAX+1];
734 int err;
735
736 memset(tuple, 0, sizeof(*tuple));
737
738 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
739
740 if (!tb[CTA_TUPLE_IP])
741 return -EINVAL;
742
743 tuple->src.l3num = l3num;
744
745 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
746 if (err < 0)
747 return err;
748
749 if (!tb[CTA_TUPLE_PROTO])
750 return -EINVAL;
751
752 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
753 if (err < 0)
754 return err;
755
756 /* orig and expect tuples get DIR_ORIGINAL */
757 if (type == CTA_TUPLE_REPLY)
758 tuple->dst.dir = IP_CT_DIR_REPLY;
759 else
760 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
761
762 return 0;
763}
764
765static inline int
766ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
767{
768 struct nlattr *tb[CTA_HELP_MAX+1];
769
770 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
771
772 if (!tb[CTA_HELP_NAME])
773 return -EINVAL;
774
775 *helper_name = nla_data(tb[CTA_HELP_NAME]);
776
777 return 0;
778}
779
780static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
781 [CTA_STATUS] = { .type = NLA_U32 },
782 [CTA_TIMEOUT] = { .type = NLA_U32 },
783 [CTA_MARK] = { .type = NLA_U32 },
784 [CTA_USE] = { .type = NLA_U32 },
785 [CTA_ID] = { .type = NLA_U32 },
786};
787
788static int
789ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
790 struct nlmsghdr *nlh, struct nlattr *cda[])
791{
792 struct nf_conntrack_tuple_hash *h;
793 struct nf_conntrack_tuple tuple;
794 struct nf_conn *ct;
795 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
796 u_int8_t u3 = nfmsg->nfgen_family;
797 int err = 0;
798
799 if (cda[CTA_TUPLE_ORIG])
800 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
801 else if (cda[CTA_TUPLE_REPLY])
802 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
803 else {
804 /* Flush the whole table */
805 nf_conntrack_flush(&init_net,
806 NETLINK_CB(skb).pid,
807 nlmsg_report(nlh));
808 return 0;
809 }
810
811 if (err < 0)
812 return err;
813
814 h = nf_conntrack_find_get(&init_net, &tuple);
815 if (!h)
816 return -ENOENT;
817
818 ct = nf_ct_tuplehash_to_ctrack(h);
819
820 if (cda[CTA_ID]) {
821 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
822 if (id != (u32)(unsigned long)ct) {
823 nf_ct_put(ct);
824 return -ENOENT;
825 }
826 }
827
828 nf_conntrack_event_report(IPCT_DESTROY,
829 ct,
830 NETLINK_CB(skb).pid,
831 nlmsg_report(nlh));
832
833 /* death_by_timeout would report the event again */
834 set_bit(IPS_DYING_BIT, &ct->status);
835
836 nf_ct_kill(ct);
837 nf_ct_put(ct);
838
839 return 0;
840}
841
842static int
843ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
844 struct nlmsghdr *nlh, struct nlattr *cda[])
845{
846 struct nf_conntrack_tuple_hash *h;
847 struct nf_conntrack_tuple tuple;
848 struct nf_conn *ct;
849 struct sk_buff *skb2 = NULL;
850 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
851 u_int8_t u3 = nfmsg->nfgen_family;
852 int err = 0;
853
854 if (nlh->nlmsg_flags & NLM_F_DUMP)
855 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
856 ctnetlink_done);
857
858 if (cda[CTA_TUPLE_ORIG])
859 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
860 else if (cda[CTA_TUPLE_REPLY])
861 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
862 else
863 return -EINVAL;
864
865 if (err < 0)
866 return err;
867
868 h = nf_conntrack_find_get(&init_net, &tuple);
869 if (!h)
870 return -ENOENT;
871
872 ct = nf_ct_tuplehash_to_ctrack(h);
873
874 err = -ENOMEM;
875 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
876 if (!skb2) {
877 nf_ct_put(ct);
878 return -ENOMEM;
879 }
880
881 rcu_read_lock();
882 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
883 IPCTNL_MSG_CT_NEW, 1, ct);
884 rcu_read_unlock();
885 nf_ct_put(ct);
886 if (err <= 0)
887 goto free;
888
889 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
890 if (err < 0)
891 goto out;
892
893 return 0;
894
895free:
896 kfree_skb(skb2);
897out:
898 return err;
899}
900
901#ifdef CONFIG_NF_NAT_NEEDED
902static int
903ctnetlink_parse_nat_setup(struct nf_conn *ct,
904 enum nf_nat_manip_type manip,
905 struct nlattr *attr)
906{
907 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
908
909 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
910 if (!parse_nat_setup) {
911#ifdef CONFIG_MODULES
912 rcu_read_unlock();
913 spin_unlock_bh(&nf_conntrack_lock);
914 nfnl_unlock();
915 if (request_module("nf-nat-ipv4") < 0) {
916 nfnl_lock();
917 spin_lock_bh(&nf_conntrack_lock);
918 rcu_read_lock();
919 return -EOPNOTSUPP;
920 }
921 nfnl_lock();
922 spin_lock_bh(&nf_conntrack_lock);
923 rcu_read_lock();
924 if (nfnetlink_parse_nat_setup_hook)
925 return -EAGAIN;
926#endif
927 return -EOPNOTSUPP;
928 }
929
930 return parse_nat_setup(ct, manip, attr);
931}
932#endif
933
934static int
935ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
936{
937 unsigned long d;
938 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
939 d = ct->status ^ status;
940
941 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
942 /* unchangeable */
943 return -EBUSY;
944
945 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
946 /* SEEN_REPLY bit can only be set */
947 return -EBUSY;
948
949 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
950 /* ASSURED bit can only be set */
951 return -EBUSY;
952
953 /* Be careful here, modifying NAT bits can screw up things,
954 * so don't let users modify them directly if they don't pass
955 * nf_nat_range. */
956 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
957 return 0;
958}
959
960static int
961ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[])
962{
963#ifdef CONFIG_NF_NAT_NEEDED
964 int ret;
965
966 if (cda[CTA_NAT_DST]) {
967 ret = ctnetlink_parse_nat_setup(ct,
968 IP_NAT_MANIP_DST,
969 cda[CTA_NAT_DST]);
970 if (ret < 0)
971 return ret;
972 }
973 if (cda[CTA_NAT_SRC]) {
974 ret = ctnetlink_parse_nat_setup(ct,
975 IP_NAT_MANIP_SRC,
976 cda[CTA_NAT_SRC]);
977 if (ret < 0)
978 return ret;
979 }
980 return 0;
981#else
982 return -EOPNOTSUPP;
983#endif
984}
985
986static inline int
987ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
988{
989 struct nf_conntrack_helper *helper;
990 struct nf_conn_help *help = nfct_help(ct);
991 char *helpname;
992 int err;
993
994 /* don't change helper of sibling connections */
995 if (ct->master)
996 return -EBUSY;
997
998 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
999 if (err < 0)
1000 return err;
1001
1002 if (!strcmp(helpname, "")) {
1003 if (help && help->helper) {
1004 /* we had a helper before ... */
1005 nf_ct_remove_expectations(ct);
1006 rcu_assign_pointer(help->helper, NULL);
1007 }
1008
1009 return 0;
1010 }
1011
1012 helper = __nf_conntrack_helper_find_byname(helpname);
1013 if (helper == NULL) {
1014#ifdef CONFIG_MODULES
1015 spin_unlock_bh(&nf_conntrack_lock);
1016
1017 if (request_module("nfct-helper-%s", helpname) < 0) {
1018 spin_lock_bh(&nf_conntrack_lock);
1019 return -EOPNOTSUPP;
1020 }
1021
1022 spin_lock_bh(&nf_conntrack_lock);
1023 helper = __nf_conntrack_helper_find_byname(helpname);
1024 if (helper)
1025 return -EAGAIN;
1026#endif
1027 return -EOPNOTSUPP;
1028 }
1029
1030 if (help) {
1031 if (help->helper == helper)
1032 return 0;
1033 if (help->helper)
1034 return -EBUSY;
1035 /* need to zero data of old helper */
1036 memset(&help->help, 0, sizeof(help->help));
1037 } else {
1038 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1039 if (help == NULL)
1040 return -ENOMEM;
1041 }
1042
1043 rcu_assign_pointer(help->helper, helper);
1044
1045 return 0;
1046}
1047
1048static inline int
1049ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
1050{
1051 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1052
1053 if (!del_timer(&ct->timeout))
1054 return -ETIME;
1055
1056 ct->timeout.expires = jiffies + timeout * HZ;
1057 add_timer(&ct->timeout);
1058
1059 return 0;
1060}
1061
1062static inline int
1063ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1064{
1065 struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1066 struct nf_conntrack_l4proto *l4proto;
1067 int err = 0;
1068
1069 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1070
1071 rcu_read_lock();
1072 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1073 if (l4proto->from_nlattr)
1074 err = l4proto->from_nlattr(tb, ct);
1075 rcu_read_unlock();
1076
1077 return err;
1078}
1079
1080#ifdef CONFIG_NF_NAT_NEEDED
1081static inline int
1082change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1083{
1084 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1085
1086 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1087
1088 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1089 return -EINVAL;
1090
1091 natseq->correction_pos =
1092 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1093
1094 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1095 return -EINVAL;
1096
1097 natseq->offset_before =
1098 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1099
1100 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1101 return -EINVAL;
1102
1103 natseq->offset_after =
1104 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1105
1106 return 0;
1107}
1108
1109static int
1110ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1111{
1112 int ret = 0;
1113 struct nf_conn_nat *nat = nfct_nat(ct);
1114
1115 if (!nat)
1116 return 0;
1117
1118 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1119 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1120 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1121 if (ret < 0)
1122 return ret;
1123
1124 ct->status |= IPS_SEQ_ADJUST;
1125 }
1126
1127 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1128 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1129 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1130 if (ret < 0)
1131 return ret;
1132
1133 ct->status |= IPS_SEQ_ADJUST;
1134 }
1135
1136 return 0;
1137}
1138#endif
1139
1140static int
1141ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1142{
1143 int err;
1144
1145 /* only allow NAT changes and master assignation for new conntracks */
1146 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1147 return -EOPNOTSUPP;
1148
1149 if (cda[CTA_HELP]) {
1150 err = ctnetlink_change_helper(ct, cda);
1151 if (err < 0)
1152 return err;
1153 }
1154
1155 if (cda[CTA_TIMEOUT]) {
1156 err = ctnetlink_change_timeout(ct, cda);
1157 if (err < 0)
1158 return err;
1159 }
1160
1161 if (cda[CTA_STATUS]) {
1162 err = ctnetlink_change_status(ct, cda);
1163 if (err < 0)
1164 return err;
1165 }
1166
1167 if (cda[CTA_PROTOINFO]) {
1168 err = ctnetlink_change_protoinfo(ct, cda);
1169 if (err < 0)
1170 return err;
1171 }
1172
1173#if defined(CONFIG_NF_CONNTRACK_MARK)
1174 if (cda[CTA_MARK])
1175 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1176#endif
1177
1178#ifdef CONFIG_NF_NAT_NEEDED
1179 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1180 err = ctnetlink_change_nat_seq_adj(ct, cda);
1181 if (err < 0)
1182 return err;
1183 }
1184#endif
1185
1186 return 0;
1187}
1188
1189static inline void
1190ctnetlink_event_report(struct nf_conn *ct, u32 pid, int report)
1191{
1192 unsigned int events = 0;
1193
1194 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1195 events |= IPCT_RELATED;
1196 else
1197 events |= IPCT_NEW;
1198
1199 nf_conntrack_event_report(IPCT_STATUS |
1200 IPCT_HELPER |
1201 IPCT_REFRESH |
1202 IPCT_PROTOINFO |
1203 IPCT_NATSEQADJ |
1204 IPCT_MARK |
1205 events,
1206 ct,
1207 pid,
1208 report);
1209}
1210
1211static struct nf_conn *
1212ctnetlink_create_conntrack(struct nlattr *cda[],
1213 struct nf_conntrack_tuple *otuple,
1214 struct nf_conntrack_tuple *rtuple,
1215 u8 u3)
1216{
1217 struct nf_conn *ct;
1218 int err = -EINVAL;
1219 struct nf_conntrack_helper *helper;
1220
1221 ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_ATOMIC);
1222 if (IS_ERR(ct))
1223 return ERR_PTR(-ENOMEM);
1224
1225 if (!cda[CTA_TIMEOUT])
1226 goto err1;
1227 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1228
1229 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1230 ct->status |= IPS_CONFIRMED;
1231
1232 rcu_read_lock();
1233 if (cda[CTA_HELP]) {
1234 char *helpname;
1235
1236 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1237 if (err < 0)
1238 goto err2;
1239
1240 helper = __nf_conntrack_helper_find_byname(helpname);
1241 if (helper == NULL) {
1242 rcu_read_unlock();
1243#ifdef CONFIG_MODULES
1244 if (request_module("nfct-helper-%s", helpname) < 0) {
1245 err = -EOPNOTSUPP;
1246 goto err1;
1247 }
1248
1249 rcu_read_lock();
1250 helper = __nf_conntrack_helper_find_byname(helpname);
1251 if (helper) {
1252 err = -EAGAIN;
1253 goto err2;
1254 }
1255 rcu_read_unlock();
1256#endif
1257 err = -EOPNOTSUPP;
1258 goto err1;
1259 } else {
1260 struct nf_conn_help *help;
1261
1262 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1263 if (help == NULL) {
1264 err = -ENOMEM;
1265 goto err2;
1266 }
1267
1268 /* not in hash table yet so not strictly necessary */
1269 rcu_assign_pointer(help->helper, helper);
1270 }
1271 } else {
1272 /* try an implicit helper assignation */
1273 err = __nf_ct_try_assign_helper(ct, GFP_ATOMIC);
1274 if (err < 0)
1275 goto err2;
1276 }
1277
1278 if (cda[CTA_STATUS]) {
1279 err = ctnetlink_change_status(ct, cda);
1280 if (err < 0)
1281 goto err2;
1282 }
1283
1284 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1285 err = ctnetlink_change_nat(ct, cda);
1286 if (err < 0)
1287 goto err2;
1288 }
1289
1290#ifdef CONFIG_NF_NAT_NEEDED
1291 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1292 err = ctnetlink_change_nat_seq_adj(ct, cda);
1293 if (err < 0)
1294 goto err2;
1295 }
1296#endif
1297
1298 if (cda[CTA_PROTOINFO]) {
1299 err = ctnetlink_change_protoinfo(ct, cda);
1300 if (err < 0)
1301 goto err2;
1302 }
1303
1304 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1305
1306#if defined(CONFIG_NF_CONNTRACK_MARK)
1307 if (cda[CTA_MARK])
1308 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1309#endif
1310
1311 /* setup master conntrack: this is a confirmed expectation */
1312 if (cda[CTA_TUPLE_MASTER]) {
1313 struct nf_conntrack_tuple master;
1314 struct nf_conntrack_tuple_hash *master_h;
1315 struct nf_conn *master_ct;
1316
1317 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1318 if (err < 0)
1319 goto err2;
1320
1321 master_h = nf_conntrack_find_get(&init_net, &master);
1322 if (master_h == NULL) {
1323 err = -ENOENT;
1324 goto err2;
1325 }
1326 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1327 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1328 ct->master = master_ct;
1329 }
1330
1331 add_timer(&ct->timeout);
1332 nf_conntrack_hash_insert(ct);
1333 rcu_read_unlock();
1334
1335 return ct;
1336
1337err2:
1338 rcu_read_unlock();
1339err1:
1340 nf_conntrack_free(ct);
1341 return ERR_PTR(err);
1342}
1343
1344static int
1345ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1346 struct nlmsghdr *nlh, struct nlattr *cda[])
1347{
1348 struct nf_conntrack_tuple otuple, rtuple;
1349 struct nf_conntrack_tuple_hash *h = NULL;
1350 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1351 u_int8_t u3 = nfmsg->nfgen_family;
1352 int err = 0;
1353
1354 if (cda[CTA_TUPLE_ORIG]) {
1355 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1356 if (err < 0)
1357 return err;
1358 }
1359
1360 if (cda[CTA_TUPLE_REPLY]) {
1361 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1362 if (err < 0)
1363 return err;
1364 }
1365
1366 spin_lock_bh(&nf_conntrack_lock);
1367 if (cda[CTA_TUPLE_ORIG])
1368 h = __nf_conntrack_find(&init_net, &otuple);
1369 else if (cda[CTA_TUPLE_REPLY])
1370 h = __nf_conntrack_find(&init_net, &rtuple);
1371
1372 if (h == NULL) {
1373 err = -ENOENT;
1374 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1375 struct nf_conn *ct;
1376
1377 ct = ctnetlink_create_conntrack(cda, &otuple,
1378 &rtuple, u3);
1379 if (IS_ERR(ct)) {
1380 err = PTR_ERR(ct);
1381 goto out_unlock;
1382 }
1383 err = 0;
1384 nf_conntrack_get(&ct->ct_general);
1385 spin_unlock_bh(&nf_conntrack_lock);
1386 ctnetlink_event_report(ct,
1387 NETLINK_CB(skb).pid,
1388 nlmsg_report(nlh));
1389 nf_ct_put(ct);
1390 } else
1391 spin_unlock_bh(&nf_conntrack_lock);
1392
1393 return err;
1394 }
1395 /* implicit 'else' */
1396
1397 /* We manipulate the conntrack inside the global conntrack table lock,
1398 * so there's no need to increase the refcount */
1399 err = -EEXIST;
1400 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1401 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1402
1403 err = ctnetlink_change_conntrack(ct, cda);
1404 if (err == 0) {
1405 nf_conntrack_get(&ct->ct_general);
1406 spin_unlock_bh(&nf_conntrack_lock);
1407 ctnetlink_event_report(ct,
1408 NETLINK_CB(skb).pid,
1409 nlmsg_report(nlh));
1410 nf_ct_put(ct);
1411 } else
1412 spin_unlock_bh(&nf_conntrack_lock);
1413
1414 return err;
1415 }
1416
1417out_unlock:
1418 spin_unlock_bh(&nf_conntrack_lock);
1419 return err;
1420}
1421
1422/***********************************************************************
1423 * EXPECT
1424 ***********************************************************************/
1425
1426static inline int
1427ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1428 const struct nf_conntrack_tuple *tuple,
1429 enum ctattr_expect type)
1430{
1431 struct nlattr *nest_parms;
1432
1433 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1434 if (!nest_parms)
1435 goto nla_put_failure;
1436 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1437 goto nla_put_failure;
1438 nla_nest_end(skb, nest_parms);
1439
1440 return 0;
1441
1442nla_put_failure:
1443 return -1;
1444}
1445
1446static inline int
1447ctnetlink_exp_dump_mask(struct sk_buff *skb,
1448 const struct nf_conntrack_tuple *tuple,
1449 const struct nf_conntrack_tuple_mask *mask)
1450{
1451 int ret;
1452 struct nf_conntrack_l3proto *l3proto;
1453 struct nf_conntrack_l4proto *l4proto;
1454 struct nf_conntrack_tuple m;
1455 struct nlattr *nest_parms;
1456
1457 memset(&m, 0xFF, sizeof(m));
1458 m.src.u.all = mask->src.u.all;
1459 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1460
1461 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1462 if (!nest_parms)
1463 goto nla_put_failure;
1464
1465 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1466 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1467
1468 if (unlikely(ret < 0))
1469 goto nla_put_failure;
1470
1471 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1472 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1473 if (unlikely(ret < 0))
1474 goto nla_put_failure;
1475
1476 nla_nest_end(skb, nest_parms);
1477
1478 return 0;
1479
1480nla_put_failure:
1481 return -1;
1482}
1483
1484static int
1485ctnetlink_exp_dump_expect(struct sk_buff *skb,
1486 const struct nf_conntrack_expect *exp)
1487{
1488 struct nf_conn *master = exp->master;
1489 long timeout = (exp->timeout.expires - jiffies) / HZ;
1490
1491 if (timeout < 0)
1492 timeout = 0;
1493
1494 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1495 goto nla_put_failure;
1496 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1497 goto nla_put_failure;
1498 if (ctnetlink_exp_dump_tuple(skb,
1499 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1500 CTA_EXPECT_MASTER) < 0)
1501 goto nla_put_failure;
1502
1503 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1504 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1505
1506 return 0;
1507
1508nla_put_failure:
1509 return -1;
1510}
1511
1512static int
1513ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1514 int event,
1515 int nowait,
1516 const struct nf_conntrack_expect *exp)
1517{
1518 struct nlmsghdr *nlh;
1519 struct nfgenmsg *nfmsg;
1520 unsigned char *b = skb_tail_pointer(skb);
1521
1522 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1523 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1524 nfmsg = NLMSG_DATA(nlh);
1525
1526 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1527 nfmsg->nfgen_family = exp->tuple.src.l3num;
1528 nfmsg->version = NFNETLINK_V0;
1529 nfmsg->res_id = 0;
1530
1531 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1532 goto nla_put_failure;
1533
1534 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1535 return skb->len;
1536
1537nlmsg_failure:
1538nla_put_failure:
1539 nlmsg_trim(skb, b);
1540 return -1;
1541}
1542
1543#ifdef CONFIG_NF_CONNTRACK_EVENTS
1544static int ctnetlink_expect_event(struct notifier_block *this,
1545 unsigned long events, void *ptr)
1546{
1547 struct nlmsghdr *nlh;
1548 struct nfgenmsg *nfmsg;
1549 struct nf_exp_event *item = (struct nf_exp_event *)ptr;
1550 struct nf_conntrack_expect *exp = item->exp;
1551 struct sk_buff *skb;
1552 unsigned int type;
1553 sk_buff_data_t b;
1554 int flags = 0;
1555
1556 if (events & IPEXP_NEW) {
1557 type = IPCTNL_MSG_EXP_NEW;
1558 flags = NLM_F_CREATE|NLM_F_EXCL;
1559 } else
1560 return NOTIFY_DONE;
1561
1562 if (!item->report &&
1563 !nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1564 return NOTIFY_DONE;
1565
1566 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1567 if (!skb)
1568 goto errout;
1569
1570 b = skb->tail;
1571
1572 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1573 nlh = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
1574 nfmsg = NLMSG_DATA(nlh);
1575
1576 nlh->nlmsg_flags = flags;
1577 nfmsg->nfgen_family = exp->tuple.src.l3num;
1578 nfmsg->version = NFNETLINK_V0;
1579 nfmsg->res_id = 0;
1580
1581 rcu_read_lock();
1582 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1583 goto nla_put_failure;
1584 rcu_read_unlock();
1585
1586 nlh->nlmsg_len = skb->tail - b;
1587 nfnetlink_send(skb, item->pid, NFNLGRP_CONNTRACK_EXP_NEW, item->report);
1588 return NOTIFY_DONE;
1589
1590nla_put_failure:
1591 rcu_read_unlock();
1592nlmsg_failure:
1593 kfree_skb(skb);
1594errout:
1595 nfnetlink_set_err(0, 0, -ENOBUFS);
1596 return NOTIFY_DONE;
1597}
1598#endif
1599static int ctnetlink_exp_done(struct netlink_callback *cb)
1600{
1601 if (cb->args[1])
1602 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1603 return 0;
1604}
1605
1606static int
1607ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1608{
1609 struct net *net = &init_net;
1610 struct nf_conntrack_expect *exp, *last;
1611 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1612 struct hlist_node *n;
1613 u_int8_t l3proto = nfmsg->nfgen_family;
1614
1615 rcu_read_lock();
1616 last = (struct nf_conntrack_expect *)cb->args[1];
1617 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1618restart:
1619 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1620 hnode) {
1621 if (l3proto && exp->tuple.src.l3num != l3proto)
1622 continue;
1623 if (cb->args[1]) {
1624 if (exp != last)
1625 continue;
1626 cb->args[1] = 0;
1627 }
1628 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1629 cb->nlh->nlmsg_seq,
1630 IPCTNL_MSG_EXP_NEW,
1631 1, exp) < 0) {
1632 if (!atomic_inc_not_zero(&exp->use))
1633 continue;
1634 cb->args[1] = (unsigned long)exp;
1635 goto out;
1636 }
1637 }
1638 if (cb->args[1]) {
1639 cb->args[1] = 0;
1640 goto restart;
1641 }
1642 }
1643out:
1644 rcu_read_unlock();
1645 if (last)
1646 nf_ct_expect_put(last);
1647
1648 return skb->len;
1649}
1650
1651static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1652 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1653 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1654};
1655
1656static int
1657ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1658 struct nlmsghdr *nlh, struct nlattr *cda[])
1659{
1660 struct nf_conntrack_tuple tuple;
1661 struct nf_conntrack_expect *exp;
1662 struct sk_buff *skb2;
1663 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1664 u_int8_t u3 = nfmsg->nfgen_family;
1665 int err = 0;
1666
1667 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1668 return netlink_dump_start(ctnl, skb, nlh,
1669 ctnetlink_exp_dump_table,
1670 ctnetlink_exp_done);
1671 }
1672
1673 if (cda[CTA_EXPECT_MASTER])
1674 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1675 else
1676 return -EINVAL;
1677
1678 if (err < 0)
1679 return err;
1680
1681 exp = nf_ct_expect_find_get(&init_net, &tuple);
1682 if (!exp)
1683 return -ENOENT;
1684
1685 if (cda[CTA_EXPECT_ID]) {
1686 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1687 if (ntohl(id) != (u32)(unsigned long)exp) {
1688 nf_ct_expect_put(exp);
1689 return -ENOENT;
1690 }
1691 }
1692
1693 err = -ENOMEM;
1694 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1695 if (!skb2)
1696 goto out;
1697
1698 rcu_read_lock();
1699 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1700 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1701 1, exp);
1702 rcu_read_unlock();
1703 if (err <= 0)
1704 goto free;
1705
1706 nf_ct_expect_put(exp);
1707
1708 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1709
1710free:
1711 kfree_skb(skb2);
1712out:
1713 nf_ct_expect_put(exp);
1714 return err;
1715}
1716
1717static int
1718ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1719 struct nlmsghdr *nlh, struct nlattr *cda[])
1720{
1721 struct nf_conntrack_expect *exp;
1722 struct nf_conntrack_tuple tuple;
1723 struct nf_conntrack_helper *h;
1724 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1725 struct hlist_node *n, *next;
1726 u_int8_t u3 = nfmsg->nfgen_family;
1727 unsigned int i;
1728 int err;
1729
1730 if (cda[CTA_EXPECT_TUPLE]) {
1731 /* delete a single expect by tuple */
1732 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1733 if (err < 0)
1734 return err;
1735
1736 /* bump usage count to 2 */
1737 exp = nf_ct_expect_find_get(&init_net, &tuple);
1738 if (!exp)
1739 return -ENOENT;
1740
1741 if (cda[CTA_EXPECT_ID]) {
1742 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1743 if (ntohl(id) != (u32)(unsigned long)exp) {
1744 nf_ct_expect_put(exp);
1745 return -ENOENT;
1746 }
1747 }
1748
1749 /* after list removal, usage count == 1 */
1750 nf_ct_unexpect_related(exp);
1751 /* have to put what we 'get' above.
1752 * after this line usage count == 0 */
1753 nf_ct_expect_put(exp);
1754 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1755 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1756 struct nf_conn_help *m_help;
1757
1758 /* delete all expectations for this helper */
1759 spin_lock_bh(&nf_conntrack_lock);
1760 h = __nf_conntrack_helper_find_byname(name);
1761 if (!h) {
1762 spin_unlock_bh(&nf_conntrack_lock);
1763 return -EOPNOTSUPP;
1764 }
1765 for (i = 0; i < nf_ct_expect_hsize; i++) {
1766 hlist_for_each_entry_safe(exp, n, next,
1767 &init_net.ct.expect_hash[i],
1768 hnode) {
1769 m_help = nfct_help(exp->master);
1770 if (m_help->helper == h
1771 && del_timer(&exp->timeout)) {
1772 nf_ct_unlink_expect(exp);
1773 nf_ct_expect_put(exp);
1774 }
1775 }
1776 }
1777 spin_unlock_bh(&nf_conntrack_lock);
1778 } else {
1779 /* This basically means we have to flush everything*/
1780 spin_lock_bh(&nf_conntrack_lock);
1781 for (i = 0; i < nf_ct_expect_hsize; i++) {
1782 hlist_for_each_entry_safe(exp, n, next,
1783 &init_net.ct.expect_hash[i],
1784 hnode) {
1785 if (del_timer(&exp->timeout)) {
1786 nf_ct_unlink_expect(exp);
1787 nf_ct_expect_put(exp);
1788 }
1789 }
1790 }
1791 spin_unlock_bh(&nf_conntrack_lock);
1792 }
1793
1794 return 0;
1795}
1796static int
1797ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1798{
1799 return -EOPNOTSUPP;
1800}
1801
1802static int
1803ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3, u32 pid, int report)
1804{
1805 struct nf_conntrack_tuple tuple, mask, master_tuple;
1806 struct nf_conntrack_tuple_hash *h = NULL;
1807 struct nf_conntrack_expect *exp;
1808 struct nf_conn *ct;
1809 struct nf_conn_help *help;
1810 int err = 0;
1811
1812 /* caller guarantees that those three CTA_EXPECT_* exist */
1813 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1814 if (err < 0)
1815 return err;
1816 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1817 if (err < 0)
1818 return err;
1819 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1820 if (err < 0)
1821 return err;
1822
1823 /* Look for master conntrack of this expectation */
1824 h = nf_conntrack_find_get(&init_net, &master_tuple);
1825 if (!h)
1826 return -ENOENT;
1827 ct = nf_ct_tuplehash_to_ctrack(h);
1828 help = nfct_help(ct);
1829
1830 if (!help || !help->helper) {
1831 /* such conntrack hasn't got any helper, abort */
1832 err = -EOPNOTSUPP;
1833 goto out;
1834 }
1835
1836 exp = nf_ct_expect_alloc(ct);
1837 if (!exp) {
1838 err = -ENOMEM;
1839 goto out;
1840 }
1841
1842 exp->class = 0;
1843 exp->expectfn = NULL;
1844 exp->flags = 0;
1845 exp->master = ct;
1846 exp->helper = NULL;
1847 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1848 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1849 exp->mask.src.u.all = mask.src.u.all;
1850
1851 err = nf_ct_expect_related_report(exp, pid, report);
1852 nf_ct_expect_put(exp);
1853
1854out:
1855 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1856 return err;
1857}
1858
1859static int
1860ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1861 struct nlmsghdr *nlh, struct nlattr *cda[])
1862{
1863 struct nf_conntrack_tuple tuple;
1864 struct nf_conntrack_expect *exp;
1865 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1866 u_int8_t u3 = nfmsg->nfgen_family;
1867 int err = 0;
1868
1869 if (!cda[CTA_EXPECT_TUPLE]
1870 || !cda[CTA_EXPECT_MASK]
1871 || !cda[CTA_EXPECT_MASTER])
1872 return -EINVAL;
1873
1874 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1875 if (err < 0)
1876 return err;
1877
1878 spin_lock_bh(&nf_conntrack_lock);
1879 exp = __nf_ct_expect_find(&init_net, &tuple);
1880
1881 if (!exp) {
1882 spin_unlock_bh(&nf_conntrack_lock);
1883 err = -ENOENT;
1884 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1885 err = ctnetlink_create_expect(cda,
1886 u3,
1887 NETLINK_CB(skb).pid,
1888 nlmsg_report(nlh));
1889 }
1890 return err;
1891 }
1892
1893 err = -EEXIST;
1894 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1895 err = ctnetlink_change_expect(exp, cda);
1896 spin_unlock_bh(&nf_conntrack_lock);
1897
1898 return err;
1899}
1900
1901#ifdef CONFIG_NF_CONNTRACK_EVENTS
1902static struct notifier_block ctnl_notifier = {
1903 .notifier_call = ctnetlink_conntrack_event,
1904};
1905
1906static struct notifier_block ctnl_notifier_exp = {
1907 .notifier_call = ctnetlink_expect_event,
1908};
1909#endif
1910
1911static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1912 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1913 .attr_count = CTA_MAX,
1914 .policy = ct_nla_policy },
1915 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1916 .attr_count = CTA_MAX,
1917 .policy = ct_nla_policy },
1918 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1919 .attr_count = CTA_MAX,
1920 .policy = ct_nla_policy },
1921 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1922 .attr_count = CTA_MAX,
1923 .policy = ct_nla_policy },
1924};
1925
1926static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1927 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1928 .attr_count = CTA_EXPECT_MAX,
1929 .policy = exp_nla_policy },
1930 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1931 .attr_count = CTA_EXPECT_MAX,
1932 .policy = exp_nla_policy },
1933 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1934 .attr_count = CTA_EXPECT_MAX,
1935 .policy = exp_nla_policy },
1936};
1937
1938static const struct nfnetlink_subsystem ctnl_subsys = {
1939 .name = "conntrack",
1940 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1941 .cb_count = IPCTNL_MSG_MAX,
1942 .cb = ctnl_cb,
1943};
1944
1945static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1946 .name = "conntrack_expect",
1947 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1948 .cb_count = IPCTNL_MSG_EXP_MAX,
1949 .cb = ctnl_exp_cb,
1950};
1951
1952MODULE_ALIAS("ip_conntrack_netlink");
1953MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1954MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1955
1956static int __init ctnetlink_init(void)
1957{
1958 int ret;
1959
1960 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1961 ret = nfnetlink_subsys_register(&ctnl_subsys);
1962 if (ret < 0) {
1963 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1964 goto err_out;
1965 }
1966
1967 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1968 if (ret < 0) {
1969 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1970 goto err_unreg_subsys;
1971 }
1972
1973#ifdef CONFIG_NF_CONNTRACK_EVENTS
1974 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1975 if (ret < 0) {
1976 printk("ctnetlink_init: cannot register notifier.\n");
1977 goto err_unreg_exp_subsys;
1978 }
1979
1980 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1981 if (ret < 0) {
1982 printk("ctnetlink_init: cannot expect register notifier.\n");
1983 goto err_unreg_notifier;
1984 }
1985#endif
1986
1987 return 0;
1988
1989#ifdef CONFIG_NF_CONNTRACK_EVENTS
1990err_unreg_notifier:
1991 nf_conntrack_unregister_notifier(&ctnl_notifier);
1992err_unreg_exp_subsys:
1993 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1994#endif
1995err_unreg_subsys:
1996 nfnetlink_subsys_unregister(&ctnl_subsys);
1997err_out:
1998 return ret;
1999}
2000
2001static void __exit ctnetlink_exit(void)
2002{
2003 printk("ctnetlink: unregistering from nfnetlink.\n");
2004
2005#ifdef CONFIG_NF_CONNTRACK_EVENTS
2006 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2007 nf_conntrack_unregister_notifier(&ctnl_notifier);
2008#endif
2009
2010 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2011 nfnetlink_subsys_unregister(&ctnl_subsys);
2012 return;
2013}
2014
2015module_init(ctnetlink_init);
2016module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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