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netfilter: nf_conntrack: support conntrack templates
[net-next-2.6.git] / net / netfilter / nf_conntrack_netlink.c
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CommitLineData
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
31#include <linux/netfilter.h>
32#include <net/netlink.h>
33#include <net/sock.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, 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
349static int
350ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
351 int event, struct nf_conn *ct)
352{
353 struct nlmsghdr *nlh;
354 struct nfgenmsg *nfmsg;
355 struct nlattr *nest_parms;
356 unsigned int flags = pid ? NLM_F_MULTI : 0;
357
358 event |= NFNL_SUBSYS_CTNETLINK << 8;
359 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
360 if (nlh == NULL)
361 goto nlmsg_failure;
362
363 nfmsg = nlmsg_data(nlh);
364 nfmsg->nfgen_family = nf_ct_l3num(ct);
365 nfmsg->version = NFNETLINK_V0;
366 nfmsg->res_id = 0;
367
368 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
369 if (!nest_parms)
370 goto nla_put_failure;
371 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
372 goto nla_put_failure;
373 nla_nest_end(skb, nest_parms);
374
375 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
376 if (!nest_parms)
377 goto nla_put_failure;
378 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
379 goto nla_put_failure;
380 nla_nest_end(skb, nest_parms);
381
382 if (ctnetlink_dump_status(skb, ct) < 0 ||
383 ctnetlink_dump_timeout(skb, ct) < 0 ||
384 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
385 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
386 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
387 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
388 ctnetlink_dump_mark(skb, ct) < 0 ||
389 ctnetlink_dump_secmark(skb, ct) < 0 ||
390 ctnetlink_dump_id(skb, ct) < 0 ||
391 ctnetlink_dump_use(skb, ct) < 0 ||
392 ctnetlink_dump_master(skb, ct) < 0 ||
393 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
394 goto nla_put_failure;
395
396 nlmsg_end(skb, nlh);
397 return skb->len;
398
399nlmsg_failure:
400nla_put_failure:
401 nlmsg_cancel(skb, nlh);
402 return -1;
403}
404
405#ifdef CONFIG_NF_CONNTRACK_EVENTS
406static inline size_t
407ctnetlink_proto_size(const struct nf_conn *ct)
408{
409 struct nf_conntrack_l3proto *l3proto;
410 struct nf_conntrack_l4proto *l4proto;
411 size_t len = 0;
412
413 rcu_read_lock();
414 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
415 len += l3proto->nla_size;
416
417 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
418 len += l4proto->nla_size;
419 rcu_read_unlock();
420
421 return len;
422}
423
424static inline size_t
425ctnetlink_nlmsg_size(const struct nf_conn *ct)
426{
427 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
428 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
429 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
430 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
431 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
432 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
433 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
434#ifdef CONFIG_NF_CT_ACCT
435 + 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
436 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
437 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
438#endif
439 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
440 + nla_total_size(0) /* CTA_PROTOINFO */
441 + nla_total_size(0) /* CTA_HELP */
442 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
443#ifdef CONFIG_NF_CONNTRACK_SECMARK
444 + nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
445#endif
446#ifdef CONFIG_NF_NAT_NEEDED
447 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
448 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
449#endif
450#ifdef CONFIG_NF_CONNTRACK_MARK
451 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
452#endif
453 + ctnetlink_proto_size(ct)
454 ;
455}
456
457static int
458ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
459{
460 struct net *net;
461 struct nlmsghdr *nlh;
462 struct nfgenmsg *nfmsg;
463 struct nlattr *nest_parms;
464 struct nf_conn *ct = item->ct;
465 struct sk_buff *skb;
466 unsigned int type;
467 unsigned int flags = 0, group;
468 int err;
469
470 /* ignore our fake conntrack entry */
471 if (ct == &nf_conntrack_untracked)
472 return 0;
473
474 if (events & (1 << IPCT_DESTROY)) {
475 type = IPCTNL_MSG_CT_DELETE;
476 group = NFNLGRP_CONNTRACK_DESTROY;
477 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
478 type = IPCTNL_MSG_CT_NEW;
479 flags = NLM_F_CREATE|NLM_F_EXCL;
480 group = NFNLGRP_CONNTRACK_NEW;
481 } else if (events) {
482 type = IPCTNL_MSG_CT_NEW;
483 group = NFNLGRP_CONNTRACK_UPDATE;
484 } else
485 return 0;
486
487 net = nf_ct_net(ct);
488 if (!item->report && !nfnetlink_has_listeners(net, group))
489 return 0;
490
491 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
492 if (skb == NULL)
493 goto errout;
494
495 type |= NFNL_SUBSYS_CTNETLINK << 8;
496 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
497 if (nlh == NULL)
498 goto nlmsg_failure;
499
500 nfmsg = nlmsg_data(nlh);
501 nfmsg->nfgen_family = nf_ct_l3num(ct);
502 nfmsg->version = NFNETLINK_V0;
503 nfmsg->res_id = 0;
504
505 rcu_read_lock();
506 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
507 if (!nest_parms)
508 goto nla_put_failure;
509 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
510 goto nla_put_failure;
511 nla_nest_end(skb, nest_parms);
512
513 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
514 if (!nest_parms)
515 goto nla_put_failure;
516 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
517 goto nla_put_failure;
518 nla_nest_end(skb, nest_parms);
519
520 if (ctnetlink_dump_id(skb, ct) < 0)
521 goto nla_put_failure;
522
523 if (ctnetlink_dump_status(skb, ct) < 0)
524 goto nla_put_failure;
525
526 if (events & (1 << IPCT_DESTROY)) {
527 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
528 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
529 goto nla_put_failure;
530 } else {
531 if (ctnetlink_dump_timeout(skb, ct) < 0)
532 goto nla_put_failure;
533
534 if (events & (1 << IPCT_PROTOINFO)
535 && ctnetlink_dump_protoinfo(skb, ct) < 0)
536 goto nla_put_failure;
537
538 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
539 && ctnetlink_dump_helpinfo(skb, ct) < 0)
540 goto nla_put_failure;
541
542#ifdef CONFIG_NF_CONNTRACK_SECMARK
543 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
544 && ctnetlink_dump_secmark(skb, ct) < 0)
545 goto nla_put_failure;
546#endif
547
548 if (events & (1 << IPCT_RELATED) &&
549 ctnetlink_dump_master(skb, ct) < 0)
550 goto nla_put_failure;
551
552 if (events & (1 << IPCT_NATSEQADJ) &&
553 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
554 goto nla_put_failure;
555 }
556
557#ifdef CONFIG_NF_CONNTRACK_MARK
558 if ((events & (1 << IPCT_MARK) || ct->mark)
559 && ctnetlink_dump_mark(skb, ct) < 0)
560 goto nla_put_failure;
561#endif
562 rcu_read_unlock();
563
564 nlmsg_end(skb, nlh);
565 err = nfnetlink_send(skb, net, item->pid, group, item->report,
566 GFP_ATOMIC);
567 if (err == -ENOBUFS || err == -EAGAIN)
568 return -ENOBUFS;
569
570 return 0;
571
572nla_put_failure:
573 rcu_read_unlock();
574 nlmsg_cancel(skb, nlh);
575nlmsg_failure:
576 kfree_skb(skb);
577errout:
578 nfnetlink_set_err(net, 0, group, -ENOBUFS);
579 return 0;
580}
581#endif /* CONFIG_NF_CONNTRACK_EVENTS */
582
583static int ctnetlink_done(struct netlink_callback *cb)
584{
585 if (cb->args[1])
586 nf_ct_put((struct nf_conn *)cb->args[1]);
587 return 0;
588}
589
590static int
591ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
592{
593 struct net *net = sock_net(skb->sk);
594 struct nf_conn *ct, *last;
595 struct nf_conntrack_tuple_hash *h;
596 struct hlist_nulls_node *n;
597 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
598 u_int8_t l3proto = nfmsg->nfgen_family;
599
600 rcu_read_lock();
601 last = (struct nf_conn *)cb->args[1];
602 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
603restart:
604 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
605 hnnode) {
606 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
607 continue;
608 ct = nf_ct_tuplehash_to_ctrack(h);
609 if (!atomic_inc_not_zero(&ct->ct_general.use))
610 continue;
611 /* Dump entries of a given L3 protocol number.
612 * If it is not specified, ie. l3proto == 0,
613 * then dump everything. */
614 if (l3proto && nf_ct_l3num(ct) != l3proto)
615 goto releasect;
616 if (cb->args[1]) {
617 if (ct != last)
618 goto releasect;
619 cb->args[1] = 0;
620 }
621 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
622 cb->nlh->nlmsg_seq,
623 IPCTNL_MSG_CT_NEW, ct) < 0) {
624 cb->args[1] = (unsigned long)ct;
625 goto out;
626 }
627
628 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
629 IPCTNL_MSG_CT_GET_CTRZERO) {
630 struct nf_conn_counter *acct;
631
632 acct = nf_conn_acct_find(ct);
633 if (acct)
634 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
635 }
636releasect:
637 nf_ct_put(ct);
638 }
639 if (cb->args[1]) {
640 cb->args[1] = 0;
641 goto restart;
642 }
643 }
644out:
645 rcu_read_unlock();
646 if (last)
647 nf_ct_put(last);
648
649 return skb->len;
650}
651
652static inline int
653ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
654{
655 struct nlattr *tb[CTA_IP_MAX+1];
656 struct nf_conntrack_l3proto *l3proto;
657 int ret = 0;
658
659 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
660
661 rcu_read_lock();
662 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
663
664 if (likely(l3proto->nlattr_to_tuple)) {
665 ret = nla_validate_nested(attr, CTA_IP_MAX,
666 l3proto->nla_policy);
667 if (ret == 0)
668 ret = l3proto->nlattr_to_tuple(tb, tuple);
669 }
670
671 rcu_read_unlock();
672
673 return ret;
674}
675
676static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
677 [CTA_PROTO_NUM] = { .type = NLA_U8 },
678};
679
680static inline int
681ctnetlink_parse_tuple_proto(struct nlattr *attr,
682 struct nf_conntrack_tuple *tuple)
683{
684 struct nlattr *tb[CTA_PROTO_MAX+1];
685 struct nf_conntrack_l4proto *l4proto;
686 int ret = 0;
687
688 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
689 if (ret < 0)
690 return ret;
691
692 if (!tb[CTA_PROTO_NUM])
693 return -EINVAL;
694 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
695
696 rcu_read_lock();
697 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
698
699 if (likely(l4proto->nlattr_to_tuple)) {
700 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
701 l4proto->nla_policy);
702 if (ret == 0)
703 ret = l4proto->nlattr_to_tuple(tb, tuple);
704 }
705
706 rcu_read_unlock();
707
708 return ret;
709}
710
711static int
712ctnetlink_parse_tuple(const struct nlattr * const cda[],
713 struct nf_conntrack_tuple *tuple,
714 enum ctattr_tuple type, u_int8_t l3num)
715{
716 struct nlattr *tb[CTA_TUPLE_MAX+1];
717 int err;
718
719 memset(tuple, 0, sizeof(*tuple));
720
721 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
722
723 if (!tb[CTA_TUPLE_IP])
724 return -EINVAL;
725
726 tuple->src.l3num = l3num;
727
728 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
729 if (err < 0)
730 return err;
731
732 if (!tb[CTA_TUPLE_PROTO])
733 return -EINVAL;
734
735 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
736 if (err < 0)
737 return err;
738
739 /* orig and expect tuples get DIR_ORIGINAL */
740 if (type == CTA_TUPLE_REPLY)
741 tuple->dst.dir = IP_CT_DIR_REPLY;
742 else
743 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
744
745 return 0;
746}
747
748static inline int
749ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
750{
751 struct nlattr *tb[CTA_HELP_MAX+1];
752
753 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
754
755 if (!tb[CTA_HELP_NAME])
756 return -EINVAL;
757
758 *helper_name = nla_data(tb[CTA_HELP_NAME]);
759
760 return 0;
761}
762
763static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
764 [CTA_STATUS] = { .type = NLA_U32 },
765 [CTA_TIMEOUT] = { .type = NLA_U32 },
766 [CTA_MARK] = { .type = NLA_U32 },
767 [CTA_USE] = { .type = NLA_U32 },
768 [CTA_ID] = { .type = NLA_U32 },
769};
770
771static int
772ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
773 const struct nlmsghdr *nlh,
774 const struct nlattr * const cda[])
775{
776 struct net *net = sock_net(ctnl);
777 struct nf_conntrack_tuple_hash *h;
778 struct nf_conntrack_tuple tuple;
779 struct nf_conn *ct;
780 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
781 u_int8_t u3 = nfmsg->nfgen_family;
782 int err = 0;
783
784 if (cda[CTA_TUPLE_ORIG])
785 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
786 else if (cda[CTA_TUPLE_REPLY])
787 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
788 else {
789 /* Flush the whole table */
790 nf_conntrack_flush_report(net,
791 NETLINK_CB(skb).pid,
792 nlmsg_report(nlh));
793 return 0;
794 }
795
796 if (err < 0)
797 return err;
798
799 h = nf_conntrack_find_get(net, &tuple);
800 if (!h)
801 return -ENOENT;
802
803 ct = nf_ct_tuplehash_to_ctrack(h);
804
805 if (cda[CTA_ID]) {
806 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
807 if (id != (u32)(unsigned long)ct) {
808 nf_ct_put(ct);
809 return -ENOENT;
810 }
811 }
812
813 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
814 NETLINK_CB(skb).pid,
815 nlmsg_report(nlh)) < 0) {
816 nf_ct_delete_from_lists(ct);
817 /* we failed to report the event, try later */
818 nf_ct_insert_dying_list(ct);
819 nf_ct_put(ct);
820 return 0;
821 }
822
823 /* death_by_timeout would report the event again */
824 set_bit(IPS_DYING_BIT, &ct->status);
825
826 nf_ct_kill(ct);
827 nf_ct_put(ct);
828
829 return 0;
830}
831
832static int
833ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
834 const struct nlmsghdr *nlh,
835 const struct nlattr * const cda[])
836{
837 struct net *net = sock_net(ctnl);
838 struct nf_conntrack_tuple_hash *h;
839 struct nf_conntrack_tuple tuple;
840 struct nf_conn *ct;
841 struct sk_buff *skb2 = NULL;
842 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
843 u_int8_t u3 = nfmsg->nfgen_family;
844 int err = 0;
845
846 if (nlh->nlmsg_flags & NLM_F_DUMP)
847 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
848 ctnetlink_done);
849
850 if (cda[CTA_TUPLE_ORIG])
851 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
852 else if (cda[CTA_TUPLE_REPLY])
853 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
854 else
855 return -EINVAL;
856
857 if (err < 0)
858 return err;
859
860 h = nf_conntrack_find_get(net, &tuple);
861 if (!h)
862 return -ENOENT;
863
864 ct = nf_ct_tuplehash_to_ctrack(h);
865
866 err = -ENOMEM;
867 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
868 if (skb2 == NULL) {
869 nf_ct_put(ct);
870 return -ENOMEM;
871 }
872
873 rcu_read_lock();
874 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
875 IPCTNL_MSG_CT_NEW, ct);
876 rcu_read_unlock();
877 nf_ct_put(ct);
878 if (err <= 0)
879 goto free;
880
881 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
882 if (err < 0)
883 goto out;
884
885 return 0;
886
887free:
888 kfree_skb(skb2);
889out:
890 return err;
891}
892
893#ifdef CONFIG_NF_NAT_NEEDED
894static int
895ctnetlink_parse_nat_setup(struct nf_conn *ct,
896 enum nf_nat_manip_type manip,
897 const struct nlattr *attr)
898{
899 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
900
901 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
902 if (!parse_nat_setup) {
903#ifdef CONFIG_MODULES
904 rcu_read_unlock();
905 spin_unlock_bh(&nf_conntrack_lock);
906 nfnl_unlock();
907 if (request_module("nf-nat-ipv4") < 0) {
908 nfnl_lock();
909 spin_lock_bh(&nf_conntrack_lock);
910 rcu_read_lock();
911 return -EOPNOTSUPP;
912 }
913 nfnl_lock();
914 spin_lock_bh(&nf_conntrack_lock);
915 rcu_read_lock();
916 if (nfnetlink_parse_nat_setup_hook)
917 return -EAGAIN;
918#endif
919 return -EOPNOTSUPP;
920 }
921
922 return parse_nat_setup(ct, manip, attr);
923}
924#endif
925
926static int
927ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
928{
929 unsigned long d;
930 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
931 d = ct->status ^ status;
932
933 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
934 /* unchangeable */
935 return -EBUSY;
936
937 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
938 /* SEEN_REPLY bit can only be set */
939 return -EBUSY;
940
941 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
942 /* ASSURED bit can only be set */
943 return -EBUSY;
944
945 /* Be careful here, modifying NAT bits can screw up things,
946 * so don't let users modify them directly if they don't pass
947 * nf_nat_range. */
948 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
949 return 0;
950}
951
952static int
953ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
954{
955#ifdef CONFIG_NF_NAT_NEEDED
956 int ret;
957
958 if (cda[CTA_NAT_DST]) {
959 ret = ctnetlink_parse_nat_setup(ct,
960 IP_NAT_MANIP_DST,
961 cda[CTA_NAT_DST]);
962 if (ret < 0)
963 return ret;
964 }
965 if (cda[CTA_NAT_SRC]) {
966 ret = ctnetlink_parse_nat_setup(ct,
967 IP_NAT_MANIP_SRC,
968 cda[CTA_NAT_SRC]);
969 if (ret < 0)
970 return ret;
971 }
972 return 0;
973#else
974 return -EOPNOTSUPP;
975#endif
976}
977
978static inline int
979ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
980{
981 struct nf_conntrack_helper *helper;
982 struct nf_conn_help *help = nfct_help(ct);
983 char *helpname = NULL;
984 int err;
985
986 /* don't change helper of sibling connections */
987 if (ct->master)
988 return -EBUSY;
989
990 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
991 if (err < 0)
992 return err;
993
994 if (!strcmp(helpname, "")) {
995 if (help && help->helper) {
996 /* we had a helper before ... */
997 nf_ct_remove_expectations(ct);
998 rcu_assign_pointer(help->helper, NULL);
999 }
1000
1001 return 0;
1002 }
1003
1004 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1005 nf_ct_protonum(ct));
1006 if (helper == NULL) {
1007#ifdef CONFIG_MODULES
1008 spin_unlock_bh(&nf_conntrack_lock);
1009
1010 if (request_module("nfct-helper-%s", helpname) < 0) {
1011 spin_lock_bh(&nf_conntrack_lock);
1012 return -EOPNOTSUPP;
1013 }
1014
1015 spin_lock_bh(&nf_conntrack_lock);
1016 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1017 nf_ct_protonum(ct));
1018 if (helper)
1019 return -EAGAIN;
1020#endif
1021 return -EOPNOTSUPP;
1022 }
1023
1024 if (help) {
1025 if (help->helper == helper)
1026 return 0;
1027 if (help->helper)
1028 return -EBUSY;
1029 /* need to zero data of old helper */
1030 memset(&help->help, 0, sizeof(help->help));
1031 } else {
1032 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1033 if (help == NULL)
1034 return -ENOMEM;
1035 }
1036
1037 rcu_assign_pointer(help->helper, helper);
1038
1039 return 0;
1040}
1041
1042static inline int
1043ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1044{
1045 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1046
1047 if (!del_timer(&ct->timeout))
1048 return -ETIME;
1049
1050 ct->timeout.expires = jiffies + timeout * HZ;
1051 add_timer(&ct->timeout);
1052
1053 return 0;
1054}
1055
1056static inline int
1057ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1058{
1059 const struct nlattr *attr = cda[CTA_PROTOINFO];
1060 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1061 struct nf_conntrack_l4proto *l4proto;
1062 int err = 0;
1063
1064 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1065
1066 rcu_read_lock();
1067 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1068 if (l4proto->from_nlattr)
1069 err = l4proto->from_nlattr(tb, ct);
1070 rcu_read_unlock();
1071
1072 return err;
1073}
1074
1075#ifdef CONFIG_NF_NAT_NEEDED
1076static inline int
1077change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1078{
1079 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1080
1081 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1082
1083 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1084 return -EINVAL;
1085
1086 natseq->correction_pos =
1087 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1088
1089 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1090 return -EINVAL;
1091
1092 natseq->offset_before =
1093 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1094
1095 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1096 return -EINVAL;
1097
1098 natseq->offset_after =
1099 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1100
1101 return 0;
1102}
1103
1104static int
1105ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1106 const struct nlattr * const cda[])
1107{
1108 int ret = 0;
1109 struct nf_conn_nat *nat = nfct_nat(ct);
1110
1111 if (!nat)
1112 return 0;
1113
1114 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1115 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1116 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1117 if (ret < 0)
1118 return ret;
1119
1120 ct->status |= IPS_SEQ_ADJUST;
1121 }
1122
1123 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1124 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1125 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1126 if (ret < 0)
1127 return ret;
1128
1129 ct->status |= IPS_SEQ_ADJUST;
1130 }
1131
1132 return 0;
1133}
1134#endif
1135
1136static int
1137ctnetlink_change_conntrack(struct nf_conn *ct,
1138 const struct nlattr * const cda[])
1139{
1140 int err;
1141
1142 /* only allow NAT changes and master assignation for new conntracks */
1143 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1144 return -EOPNOTSUPP;
1145
1146 if (cda[CTA_HELP]) {
1147 err = ctnetlink_change_helper(ct, cda);
1148 if (err < 0)
1149 return err;
1150 }
1151
1152 if (cda[CTA_TIMEOUT]) {
1153 err = ctnetlink_change_timeout(ct, cda);
1154 if (err < 0)
1155 return err;
1156 }
1157
1158 if (cda[CTA_STATUS]) {
1159 err = ctnetlink_change_status(ct, cda);
1160 if (err < 0)
1161 return err;
1162 }
1163
1164 if (cda[CTA_PROTOINFO]) {
1165 err = ctnetlink_change_protoinfo(ct, cda);
1166 if (err < 0)
1167 return err;
1168 }
1169
1170#if defined(CONFIG_NF_CONNTRACK_MARK)
1171 if (cda[CTA_MARK])
1172 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1173#endif
1174
1175#ifdef CONFIG_NF_NAT_NEEDED
1176 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1177 err = ctnetlink_change_nat_seq_adj(ct, cda);
1178 if (err < 0)
1179 return err;
1180 }
1181#endif
1182
1183 return 0;
1184}
1185
1186static struct nf_conn *
1187ctnetlink_create_conntrack(struct net *net,
1188 const struct nlattr * const cda[],
1189 struct nf_conntrack_tuple *otuple,
1190 struct nf_conntrack_tuple *rtuple,
1191 u8 u3)
1192{
1193 struct nf_conn *ct;
1194 int err = -EINVAL;
1195 struct nf_conntrack_helper *helper;
1196
1197 ct = nf_conntrack_alloc(net, otuple, rtuple, GFP_ATOMIC);
1198 if (IS_ERR(ct))
1199 return ERR_PTR(-ENOMEM);
1200
1201 if (!cda[CTA_TIMEOUT])
1202 goto err1;
1203 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1204
1205 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1206 ct->status |= IPS_CONFIRMED;
1207
1208 rcu_read_lock();
1209 if (cda[CTA_HELP]) {
1210 char *helpname = NULL;
1211
1212 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1213 if (err < 0)
1214 goto err2;
1215
1216 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1217 nf_ct_protonum(ct));
1218 if (helper == NULL) {
1219 rcu_read_unlock();
1220#ifdef CONFIG_MODULES
1221 if (request_module("nfct-helper-%s", helpname) < 0) {
1222 err = -EOPNOTSUPP;
1223 goto err1;
1224 }
1225
1226 rcu_read_lock();
1227 helper = __nf_conntrack_helper_find(helpname,
1228 nf_ct_l3num(ct),
1229 nf_ct_protonum(ct));
1230 if (helper) {
1231 err = -EAGAIN;
1232 goto err2;
1233 }
1234 rcu_read_unlock();
1235#endif
1236 err = -EOPNOTSUPP;
1237 goto err1;
1238 } else {
1239 struct nf_conn_help *help;
1240
1241 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1242 if (help == NULL) {
1243 err = -ENOMEM;
1244 goto err2;
1245 }
1246
1247 /* not in hash table yet so not strictly necessary */
1248 rcu_assign_pointer(help->helper, helper);
1249 }
1250 } else {
1251 /* try an implicit helper assignation */
1252 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1253 if (err < 0)
1254 goto err2;
1255 }
1256
1257 if (cda[CTA_STATUS]) {
1258 err = ctnetlink_change_status(ct, cda);
1259 if (err < 0)
1260 goto err2;
1261 }
1262
1263 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1264 err = ctnetlink_change_nat(ct, cda);
1265 if (err < 0)
1266 goto err2;
1267 }
1268
1269#ifdef CONFIG_NF_NAT_NEEDED
1270 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1271 err = ctnetlink_change_nat_seq_adj(ct, cda);
1272 if (err < 0)
1273 goto err2;
1274 }
1275#endif
1276
1277 if (cda[CTA_PROTOINFO]) {
1278 err = ctnetlink_change_protoinfo(ct, cda);
1279 if (err < 0)
1280 goto err2;
1281 }
1282
1283 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1284 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1285
1286#if defined(CONFIG_NF_CONNTRACK_MARK)
1287 if (cda[CTA_MARK])
1288 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1289#endif
1290
1291 /* setup master conntrack: this is a confirmed expectation */
1292 if (cda[CTA_TUPLE_MASTER]) {
1293 struct nf_conntrack_tuple master;
1294 struct nf_conntrack_tuple_hash *master_h;
1295 struct nf_conn *master_ct;
1296
1297 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1298 if (err < 0)
1299 goto err2;
1300
1301 master_h = nf_conntrack_find_get(net, &master);
1302 if (master_h == NULL) {
1303 err = -ENOENT;
1304 goto err2;
1305 }
1306 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1307 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1308 ct->master = master_ct;
1309 }
1310
1311 add_timer(&ct->timeout);
1312 nf_conntrack_hash_insert(ct);
1313 rcu_read_unlock();
1314
1315 return ct;
1316
1317err2:
1318 rcu_read_unlock();
1319err1:
1320 nf_conntrack_free(ct);
1321 return ERR_PTR(err);
1322}
1323
1324static int
1325ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1326 const struct nlmsghdr *nlh,
1327 const struct nlattr * const cda[])
1328{
1329 struct net *net = sock_net(ctnl);
1330 struct nf_conntrack_tuple otuple, rtuple;
1331 struct nf_conntrack_tuple_hash *h = NULL;
1332 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1333 u_int8_t u3 = nfmsg->nfgen_family;
1334 int err = 0;
1335
1336 if (cda[CTA_TUPLE_ORIG]) {
1337 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1338 if (err < 0)
1339 return err;
1340 }
1341
1342 if (cda[CTA_TUPLE_REPLY]) {
1343 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1344 if (err < 0)
1345 return err;
1346 }
1347
1348 spin_lock_bh(&nf_conntrack_lock);
1349 if (cda[CTA_TUPLE_ORIG])
1350 h = __nf_conntrack_find(net, &otuple);
1351 else if (cda[CTA_TUPLE_REPLY])
1352 h = __nf_conntrack_find(net, &rtuple);
1353
1354 if (h == NULL) {
1355 err = -ENOENT;
1356 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1357 struct nf_conn *ct;
1358 enum ip_conntrack_events events;
1359
1360 ct = ctnetlink_create_conntrack(net, cda, &otuple,
1361 &rtuple, u3);
1362 if (IS_ERR(ct)) {
1363 err = PTR_ERR(ct);
1364 goto out_unlock;
1365 }
1366 err = 0;
1367 nf_conntrack_get(&ct->ct_general);
1368 spin_unlock_bh(&nf_conntrack_lock);
1369 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1370 events = IPCT_RELATED;
1371 else
1372 events = IPCT_NEW;
1373
1374 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1375 (1 << IPCT_ASSURED) |
1376 (1 << IPCT_HELPER) |
1377 (1 << IPCT_PROTOINFO) |
1378 (1 << IPCT_NATSEQADJ) |
1379 (1 << IPCT_MARK) | events,
1380 ct, NETLINK_CB(skb).pid,
1381 nlmsg_report(nlh));
1382 nf_ct_put(ct);
1383 } else
1384 spin_unlock_bh(&nf_conntrack_lock);
1385
1386 return err;
1387 }
1388 /* implicit 'else' */
1389
1390 /* We manipulate the conntrack inside the global conntrack table lock,
1391 * so there's no need to increase the refcount */
1392 err = -EEXIST;
1393 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1394 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1395
1396 err = ctnetlink_change_conntrack(ct, cda);
1397 if (err == 0) {
1398 nf_conntrack_get(&ct->ct_general);
1399 spin_unlock_bh(&nf_conntrack_lock);
1400 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1401 (1 << IPCT_ASSURED) |
1402 (1 << IPCT_HELPER) |
1403 (1 << IPCT_PROTOINFO) |
1404 (1 << IPCT_NATSEQADJ) |
1405 (1 << IPCT_MARK),
1406 ct, NETLINK_CB(skb).pid,
1407 nlmsg_report(nlh));
1408 nf_ct_put(ct);
1409 } else
1410 spin_unlock_bh(&nf_conntrack_lock);
1411
1412 return err;
1413 }
1414
1415out_unlock:
1416 spin_unlock_bh(&nf_conntrack_lock);
1417 return err;
1418}
1419
1420/***********************************************************************
1421 * EXPECT
1422 ***********************************************************************/
1423
1424static inline int
1425ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1426 const struct nf_conntrack_tuple *tuple,
1427 enum ctattr_expect type)
1428{
1429 struct nlattr *nest_parms;
1430
1431 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1432 if (!nest_parms)
1433 goto nla_put_failure;
1434 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1435 goto nla_put_failure;
1436 nla_nest_end(skb, nest_parms);
1437
1438 return 0;
1439
1440nla_put_failure:
1441 return -1;
1442}
1443
1444static inline int
1445ctnetlink_exp_dump_mask(struct sk_buff *skb,
1446 const struct nf_conntrack_tuple *tuple,
1447 const struct nf_conntrack_tuple_mask *mask)
1448{
1449 int ret;
1450 struct nf_conntrack_l3proto *l3proto;
1451 struct nf_conntrack_l4proto *l4proto;
1452 struct nf_conntrack_tuple m;
1453 struct nlattr *nest_parms;
1454
1455 memset(&m, 0xFF, sizeof(m));
1456 m.src.u.all = mask->src.u.all;
1457 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1458
1459 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1460 if (!nest_parms)
1461 goto nla_put_failure;
1462
1463 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1464 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1465
1466 if (unlikely(ret < 0))
1467 goto nla_put_failure;
1468
1469 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1470 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1471 if (unlikely(ret < 0))
1472 goto nla_put_failure;
1473
1474 nla_nest_end(skb, nest_parms);
1475
1476 return 0;
1477
1478nla_put_failure:
1479 return -1;
1480}
1481
1482static int
1483ctnetlink_exp_dump_expect(struct sk_buff *skb,
1484 const struct nf_conntrack_expect *exp)
1485{
1486 struct nf_conn *master = exp->master;
1487 long timeout = (exp->timeout.expires - jiffies) / HZ;
1488
1489 if (timeout < 0)
1490 timeout = 0;
1491
1492 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1493 goto nla_put_failure;
1494 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1495 goto nla_put_failure;
1496 if (ctnetlink_exp_dump_tuple(skb,
1497 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1498 CTA_EXPECT_MASTER) < 0)
1499 goto nla_put_failure;
1500
1501 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1502 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1503
1504 return 0;
1505
1506nla_put_failure:
1507 return -1;
1508}
1509
1510static int
1511ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1512 int event, const struct nf_conntrack_expect *exp)
1513{
1514 struct nlmsghdr *nlh;
1515 struct nfgenmsg *nfmsg;
1516 unsigned int flags = pid ? NLM_F_MULTI : 0;
1517
1518 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1519 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1520 if (nlh == NULL)
1521 goto nlmsg_failure;
1522
1523 nfmsg = nlmsg_data(nlh);
1524 nfmsg->nfgen_family = exp->tuple.src.l3num;
1525 nfmsg->version = NFNETLINK_V0;
1526 nfmsg->res_id = 0;
1527
1528 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1529 goto nla_put_failure;
1530
1531 nlmsg_end(skb, nlh);
1532 return skb->len;
1533
1534nlmsg_failure:
1535nla_put_failure:
1536 nlmsg_cancel(skb, nlh);
1537 return -1;
1538}
1539
1540#ifdef CONFIG_NF_CONNTRACK_EVENTS
1541static int
1542ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1543{
1544 struct nf_conntrack_expect *exp = item->exp;
1545 struct net *net = nf_ct_exp_net(exp);
1546 struct nlmsghdr *nlh;
1547 struct nfgenmsg *nfmsg;
1548 struct sk_buff *skb;
1549 unsigned int type;
1550 int flags = 0;
1551
1552 if (events & (1 << IPEXP_NEW)) {
1553 type = IPCTNL_MSG_EXP_NEW;
1554 flags = NLM_F_CREATE|NLM_F_EXCL;
1555 } else
1556 return 0;
1557
1558 if (!item->report &&
1559 !nfnetlink_has_listeners(net, NFNLGRP_CONNTRACK_EXP_NEW))
1560 return 0;
1561
1562 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1563 if (skb == NULL)
1564 goto errout;
1565
1566 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1567 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1568 if (nlh == NULL)
1569 goto nlmsg_failure;
1570
1571 nfmsg = nlmsg_data(nlh);
1572 nfmsg->nfgen_family = exp->tuple.src.l3num;
1573 nfmsg->version = NFNETLINK_V0;
1574 nfmsg->res_id = 0;
1575
1576 rcu_read_lock();
1577 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1578 goto nla_put_failure;
1579 rcu_read_unlock();
1580
1581 nlmsg_end(skb, nlh);
1582 nfnetlink_send(skb, net, item->pid, NFNLGRP_CONNTRACK_EXP_NEW,
1583 item->report, GFP_ATOMIC);
1584 return 0;
1585
1586nla_put_failure:
1587 rcu_read_unlock();
1588 nlmsg_cancel(skb, nlh);
1589nlmsg_failure:
1590 kfree_skb(skb);
1591errout:
1592 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1593 return 0;
1594}
1595#endif
1596static int ctnetlink_exp_done(struct netlink_callback *cb)
1597{
1598 if (cb->args[1])
1599 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1600 return 0;
1601}
1602
1603static int
1604ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1605{
1606 struct net *net = sock_net(skb->sk);
1607 struct nf_conntrack_expect *exp, *last;
1608 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1609 struct hlist_node *n;
1610 u_int8_t l3proto = nfmsg->nfgen_family;
1611
1612 rcu_read_lock();
1613 last = (struct nf_conntrack_expect *)cb->args[1];
1614 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1615restart:
1616 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1617 hnode) {
1618 if (l3proto && exp->tuple.src.l3num != l3proto)
1619 continue;
1620 if (cb->args[1]) {
1621 if (exp != last)
1622 continue;
1623 cb->args[1] = 0;
1624 }
1625 if (ctnetlink_exp_fill_info(skb,
1626 NETLINK_CB(cb->skb).pid,
1627 cb->nlh->nlmsg_seq,
1628 IPCTNL_MSG_EXP_NEW,
1629 exp) < 0) {
1630 if (!atomic_inc_not_zero(&exp->use))
1631 continue;
1632 cb->args[1] = (unsigned long)exp;
1633 goto out;
1634 }
1635 }
1636 if (cb->args[1]) {
1637 cb->args[1] = 0;
1638 goto restart;
1639 }
1640 }
1641out:
1642 rcu_read_unlock();
1643 if (last)
1644 nf_ct_expect_put(last);
1645
1646 return skb->len;
1647}
1648
1649static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1650 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1651 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1652};
1653
1654static int
1655ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1656 const struct nlmsghdr *nlh,
1657 const struct nlattr * const cda[])
1658{
1659 struct net *net = sock_net(ctnl);
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(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 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1695 if (skb2 == NULL)
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, exp);
1701 rcu_read_unlock();
1702 if (err <= 0)
1703 goto free;
1704
1705 nf_ct_expect_put(exp);
1706
1707 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1708
1709free:
1710 kfree_skb(skb2);
1711out:
1712 nf_ct_expect_put(exp);
1713 return err;
1714}
1715
1716static int
1717ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1718 const struct nlmsghdr *nlh,
1719 const struct nlattr * const cda[])
1720{
1721 struct net *net = sock_net(ctnl);
1722 struct nf_conntrack_expect *exp;
1723 struct nf_conntrack_tuple tuple;
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(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 for (i = 0; i < nf_ct_expect_hsize; i++) {
1761 hlist_for_each_entry_safe(exp, n, next,
1762 &net->ct.expect_hash[i],
1763 hnode) {
1764 m_help = nfct_help(exp->master);
1765 if (!strcmp(m_help->helper->name, name) &&
1766 del_timer(&exp->timeout)) {
1767 nf_ct_unlink_expect(exp);
1768 nf_ct_expect_put(exp);
1769 }
1770 }
1771 }
1772 spin_unlock_bh(&nf_conntrack_lock);
1773 } else {
1774 /* This basically means we have to flush everything*/
1775 spin_lock_bh(&nf_conntrack_lock);
1776 for (i = 0; i < nf_ct_expect_hsize; i++) {
1777 hlist_for_each_entry_safe(exp, n, next,
1778 &net->ct.expect_hash[i],
1779 hnode) {
1780 if (del_timer(&exp->timeout)) {
1781 nf_ct_unlink_expect(exp);
1782 nf_ct_expect_put(exp);
1783 }
1784 }
1785 }
1786 spin_unlock_bh(&nf_conntrack_lock);
1787 }
1788
1789 return 0;
1790}
1791static int
1792ctnetlink_change_expect(struct nf_conntrack_expect *x,
1793 const struct nlattr * const cda[])
1794{
1795 return -EOPNOTSUPP;
1796}
1797
1798static int
1799ctnetlink_create_expect(struct net *net, const struct nlattr * const cda[],
1800 u_int8_t u3,
1801 u32 pid, int report)
1802{
1803 struct nf_conntrack_tuple tuple, mask, master_tuple;
1804 struct nf_conntrack_tuple_hash *h = NULL;
1805 struct nf_conntrack_expect *exp;
1806 struct nf_conn *ct;
1807 struct nf_conn_help *help;
1808 int err = 0;
1809
1810 /* caller guarantees that those three CTA_EXPECT_* exist */
1811 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1812 if (err < 0)
1813 return err;
1814 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1815 if (err < 0)
1816 return err;
1817 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1818 if (err < 0)
1819 return err;
1820
1821 /* Look for master conntrack of this expectation */
1822 h = nf_conntrack_find_get(net, &master_tuple);
1823 if (!h)
1824 return -ENOENT;
1825 ct = nf_ct_tuplehash_to_ctrack(h);
1826 help = nfct_help(ct);
1827
1828 if (!help || !help->helper) {
1829 /* such conntrack hasn't got any helper, abort */
1830 err = -EOPNOTSUPP;
1831 goto out;
1832 }
1833
1834 exp = nf_ct_expect_alloc(ct);
1835 if (!exp) {
1836 err = -ENOMEM;
1837 goto out;
1838 }
1839
1840 exp->class = 0;
1841 exp->expectfn = NULL;
1842 exp->flags = 0;
1843 exp->master = ct;
1844 exp->helper = NULL;
1845 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1846 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1847 exp->mask.src.u.all = mask.src.u.all;
1848
1849 err = nf_ct_expect_related_report(exp, pid, report);
1850 nf_ct_expect_put(exp);
1851
1852out:
1853 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1854 return err;
1855}
1856
1857static int
1858ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1859 const struct nlmsghdr *nlh,
1860 const struct nlattr * const cda[])
1861{
1862 struct net *net = sock_net(ctnl);
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(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(net, 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 nf_ct_event_notifier ctnl_notifier = {
1903 .fcn = ctnetlink_conntrack_event,
1904};
1905
1906static struct nf_exp_event_notifier ctnl_notifier_exp = {
1907 .fcn = 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);
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