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davinci: audio clocks: use struct device instead of clock names
[linux-ginger.git] / net / netfilter / nf_conntrack_netlink.c
blob49479d1945700b14a8e86de3c6781ed471411694
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/netfilter/nf_conntrack.h>
34 #include <net/netfilter/nf_conntrack_core.h>
35 #include <net/netfilter/nf_conntrack_expect.h>
36 #include <net/netfilter/nf_conntrack_helper.h>
37 #include <net/netfilter/nf_conntrack_l3proto.h>
38 #include <net/netfilter/nf_conntrack_l4proto.h>
39 #include <net/netfilter/nf_conntrack_tuple.h>
40 #include <net/netfilter/nf_conntrack_acct.h>
41 #ifdef CONFIG_NF_NAT_NEEDED
42 #include <net/netfilter/nf_nat_core.h>
43 #include <net/netfilter/nf_nat_protocol.h>
44 #endif
45
46 #include <linux/netfilter/nfnetlink.h>
47 #include <linux/netfilter/nfnetlink_conntrack.h>
48
49 MODULE_LICENSE("GPL");
50
51 static char __initdata version[] = "0.93";
52
53 static inline int
54 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
55 const struct nf_conntrack_tuple *tuple,
56 struct nf_conntrack_l4proto *l4proto)
57 {
58 int ret = 0;
59 struct nlattr *nest_parms;
60
61 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
62 if (!nest_parms)
63 goto nla_put_failure;
64 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
65
66 if (likely(l4proto->tuple_to_nlattr))
67 ret = l4proto->tuple_to_nlattr(skb, tuple);
68
69 nla_nest_end(skb, nest_parms);
70
71 return ret;
72
73 nla_put_failure:
74 return -1;
75 }
76
77 static inline int
78 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
79 const struct nf_conntrack_tuple *tuple,
80 struct nf_conntrack_l3proto *l3proto)
81 {
82 int ret = 0;
83 struct nlattr *nest_parms;
84
85 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
86 if (!nest_parms)
87 goto nla_put_failure;
88
89 if (likely(l3proto->tuple_to_nlattr))
90 ret = l3proto->tuple_to_nlattr(skb, tuple);
91
92 nla_nest_end(skb, nest_parms);
93
94 return ret;
95
96 nla_put_failure:
97 return -1;
98 }
99
100 static int
101 ctnetlink_dump_tuples(struct sk_buff *skb,
102 const struct nf_conntrack_tuple *tuple)
103 {
104 int ret;
105 struct nf_conntrack_l3proto *l3proto;
106 struct nf_conntrack_l4proto *l4proto;
107
108 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
109 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
110
111 if (unlikely(ret < 0))
112 return ret;
113
114 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
115 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
116
117 return ret;
118 }
119
120 static inline int
121 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
122 {
123 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
124 return 0;
125
126 nla_put_failure:
127 return -1;
128 }
129
130 static inline int
131 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
132 {
133 long timeout = (ct->timeout.expires - jiffies) / HZ;
134
135 if (timeout < 0)
136 timeout = 0;
137
138 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
139 return 0;
140
141 nla_put_failure:
142 return -1;
143 }
144
145 static inline int
146 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
147 {
148 struct nf_conntrack_l4proto *l4proto;
149 struct nlattr *nest_proto;
150 int ret;
151
152 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
153 if (!l4proto->to_nlattr)
154 return 0;
155
156 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
157 if (!nest_proto)
158 goto nla_put_failure;
159
160 ret = l4proto->to_nlattr(skb, nest_proto, ct);
161
162 nla_nest_end(skb, nest_proto);
163
164 return ret;
165
166 nla_put_failure:
167 return -1;
168 }
169
170 static inline int
171 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
172 {
173 struct nlattr *nest_helper;
174 const struct nf_conn_help *help = nfct_help(ct);
175 struct nf_conntrack_helper *helper;
176
177 if (!help)
178 return 0;
179
180 helper = rcu_dereference(help->helper);
181 if (!helper)
182 goto out;
183
184 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
185 if (!nest_helper)
186 goto nla_put_failure;
187 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
188
189 if (helper->to_nlattr)
190 helper->to_nlattr(skb, ct);
191
192 nla_nest_end(skb, nest_helper);
193 out:
194 return 0;
195
196 nla_put_failure:
197 return -1;
198 }
199
200 static int
201 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
202 enum ip_conntrack_dir dir)
203 {
204 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
205 struct nlattr *nest_count;
206 const struct nf_conn_counter *acct;
207
208 acct = nf_conn_acct_find(ct);
209 if (!acct)
210 return 0;
211
212 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
213 if (!nest_count)
214 goto nla_put_failure;
215
216 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
217 cpu_to_be64(acct[dir].packets));
218 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
219 cpu_to_be64(acct[dir].bytes));
220
221 nla_nest_end(skb, nest_count);
222
223 return 0;
224
225 nla_put_failure:
226 return -1;
227 }
228
229 #ifdef CONFIG_NF_CONNTRACK_MARK
230 static inline int
231 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
232 {
233 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
234 return 0;
235
236 nla_put_failure:
237 return -1;
238 }
239 #else
240 #define ctnetlink_dump_mark(a, b) (0)
241 #endif
242
243 #ifdef CONFIG_NF_CONNTRACK_SECMARK
244 static inline int
245 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
246 {
247 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
248 return 0;
249
250 nla_put_failure:
251 return -1;
252 }
253 #else
254 #define ctnetlink_dump_secmark(a, b) (0)
255 #endif
256
257 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
258
259 static inline int
260 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
261 {
262 struct nlattr *nest_parms;
263
264 if (!(ct->status & IPS_EXPECTED))
265 return 0;
266
267 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
268 if (!nest_parms)
269 goto nla_put_failure;
270 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
271 goto nla_put_failure;
272 nla_nest_end(skb, nest_parms);
273
274 return 0;
275
276 nla_put_failure:
277 return -1;
278 }
279
280 #ifdef CONFIG_NF_NAT_NEEDED
281 static int
282 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
283 {
284 struct nlattr *nest_parms;
285
286 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
287 if (!nest_parms)
288 goto nla_put_failure;
289
290 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
291 htonl(natseq->correction_pos));
292 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
293 htonl(natseq->offset_before));
294 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
295 htonl(natseq->offset_after));
296
297 nla_nest_end(skb, nest_parms);
298
299 return 0;
300
301 nla_put_failure:
302 return -1;
303 }
304
305 static inline int
306 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
307 {
308 struct nf_nat_seq *natseq;
309 struct nf_conn_nat *nat = nfct_nat(ct);
310
311 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
312 return 0;
313
314 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
315 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
316 return -1;
317
318 natseq = &nat->seq[IP_CT_DIR_REPLY];
319 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
320 return -1;
321
322 return 0;
323 }
324 #else
325 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
326 #endif
327
328 static inline int
329 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
330 {
331 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
332 return 0;
333
334 nla_put_failure:
335 return -1;
336 }
337
338 static inline int
339 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
340 {
341 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
342 return 0;
343
344 nla_put_failure:
345 return -1;
346 }
347
348 static int
349 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
350 int event, struct nf_conn *ct)
351 {
352 struct nlmsghdr *nlh;
353 struct nfgenmsg *nfmsg;
354 struct nlattr *nest_parms;
355 unsigned int flags = pid ? NLM_F_MULTI : 0;
356
357 event |= NFNL_SUBSYS_CTNETLINK << 8;
358 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
359 if (nlh == NULL)
360 goto nlmsg_failure;
361
362 nfmsg = nlmsg_data(nlh);
363 nfmsg->nfgen_family = nf_ct_l3num(ct);
364 nfmsg->version = NFNETLINK_V0;
365 nfmsg->res_id = 0;
366
367 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
368 if (!nest_parms)
369 goto nla_put_failure;
370 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
371 goto nla_put_failure;
372 nla_nest_end(skb, nest_parms);
373
374 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
375 if (!nest_parms)
376 goto nla_put_failure;
377 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
378 goto nla_put_failure;
379 nla_nest_end(skb, nest_parms);
380
381 if (ctnetlink_dump_status(skb, ct) < 0 ||
382 ctnetlink_dump_timeout(skb, ct) < 0 ||
383 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
384 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
385 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
386 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
387 ctnetlink_dump_mark(skb, ct) < 0 ||
388 ctnetlink_dump_secmark(skb, ct) < 0 ||
389 ctnetlink_dump_id(skb, ct) < 0 ||
390 ctnetlink_dump_use(skb, ct) < 0 ||
391 ctnetlink_dump_master(skb, ct) < 0 ||
392 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
393 goto nla_put_failure;
394
395 nlmsg_end(skb, nlh);
396 return skb->len;
397
398 nlmsg_failure:
399 nla_put_failure:
400 nlmsg_cancel(skb, nlh);
401 return -1;
402 }
403
404 #ifdef CONFIG_NF_CONNTRACK_EVENTS
405 static inline size_t
406 ctnetlink_proto_size(const struct nf_conn *ct)
407 {
408 struct nf_conntrack_l3proto *l3proto;
409 struct nf_conntrack_l4proto *l4proto;
410 size_t len = 0;
411
412 rcu_read_lock();
413 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
414 len += l3proto->nla_size;
415
416 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
417 len += l4proto->nla_size;
418 rcu_read_unlock();
419
420 return len;
421 }
422
423 static inline size_t
424 ctnetlink_nlmsg_size(const struct nf_conn *ct)
425 {
426 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
427 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
428 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
429 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
430 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
431 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
432 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
433 #ifdef CONFIG_NF_CT_ACCT
434 + 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
435 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
436 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
437 #endif
438 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
439 + nla_total_size(0) /* CTA_PROTOINFO */
440 + nla_total_size(0) /* CTA_HELP */
441 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
442 #ifdef CONFIG_NF_CONNTRACK_SECMARK
443 + nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
444 #endif
445 #ifdef CONFIG_NF_NAT_NEEDED
446 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
447 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
448 #endif
449 #ifdef CONFIG_NF_CONNTRACK_MARK
450 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
451 #endif
452 + ctnetlink_proto_size(ct)
453 ;
454 }
455
456 static int
457 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
458 {
459 struct nlmsghdr *nlh;
460 struct nfgenmsg *nfmsg;
461 struct nlattr *nest_parms;
462 struct nf_conn *ct = item->ct;
463 struct sk_buff *skb;
464 unsigned int type;
465 unsigned int flags = 0, group;
466 int err;
467
468 /* ignore our fake conntrack entry */
469 if (ct == &nf_conntrack_untracked)
470 return 0;
471
472 if (events & (1 << IPCT_DESTROY)) {
473 type = IPCTNL_MSG_CT_DELETE;
474 group = NFNLGRP_CONNTRACK_DESTROY;
475 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
476 type = IPCTNL_MSG_CT_NEW;
477 flags = NLM_F_CREATE|NLM_F_EXCL;
478 group = NFNLGRP_CONNTRACK_NEW;
479 } else if (events) {
480 type = IPCTNL_MSG_CT_NEW;
481 group = NFNLGRP_CONNTRACK_UPDATE;
482 } else
483 return 0;
484
485 if (!item->report && !nfnetlink_has_listeners(group))
486 return 0;
487
488 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
489 if (skb == NULL)
490 goto errout;
491
492 type |= NFNL_SUBSYS_CTNETLINK << 8;
493 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
494 if (nlh == NULL)
495 goto nlmsg_failure;
496
497 nfmsg = nlmsg_data(nlh);
498 nfmsg->nfgen_family = nf_ct_l3num(ct);
499 nfmsg->version = NFNETLINK_V0;
500 nfmsg->res_id = 0;
501
502 rcu_read_lock();
503 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
504 if (!nest_parms)
505 goto nla_put_failure;
506 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
507 goto nla_put_failure;
508 nla_nest_end(skb, nest_parms);
509
510 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
511 if (!nest_parms)
512 goto nla_put_failure;
513 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
514 goto nla_put_failure;
515 nla_nest_end(skb, nest_parms);
516
517 if (ctnetlink_dump_id(skb, ct) < 0)
518 goto nla_put_failure;
519
520 if (ctnetlink_dump_status(skb, ct) < 0)
521 goto nla_put_failure;
522
523 if (events & (1 << IPCT_DESTROY)) {
524 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
525 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
526 goto nla_put_failure;
527 } else {
528 if (ctnetlink_dump_timeout(skb, ct) < 0)
529 goto nla_put_failure;
530
531 if (events & (1 << IPCT_PROTOINFO)
532 && ctnetlink_dump_protoinfo(skb, ct) < 0)
533 goto nla_put_failure;
534
535 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
536 && ctnetlink_dump_helpinfo(skb, ct) < 0)
537 goto nla_put_failure;
538
539 #ifdef CONFIG_NF_CONNTRACK_SECMARK
540 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
541 && ctnetlink_dump_secmark(skb, ct) < 0)
542 goto nla_put_failure;
543 #endif
544
545 if (events & (1 << IPCT_RELATED) &&
546 ctnetlink_dump_master(skb, ct) < 0)
547 goto nla_put_failure;
548
549 if (events & (1 << IPCT_NATSEQADJ) &&
550 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
551 goto nla_put_failure;
552 }
553
554 #ifdef CONFIG_NF_CONNTRACK_MARK
555 if ((events & (1 << IPCT_MARK) || ct->mark)
556 && ctnetlink_dump_mark(skb, ct) < 0)
557 goto nla_put_failure;
558 #endif
559 rcu_read_unlock();
560
561 nlmsg_end(skb, nlh);
562 err = nfnetlink_send(skb, item->pid, group, item->report, GFP_ATOMIC);
563 if (err == -ENOBUFS || err == -EAGAIN)
564 return -ENOBUFS;
565
566 return 0;
567
568 nla_put_failure:
569 rcu_read_unlock();
570 nlmsg_cancel(skb, nlh);
571 nlmsg_failure:
572 kfree_skb(skb);
573 errout:
574 nfnetlink_set_err(0, group, -ENOBUFS);
575 return 0;
576 }
577 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
578
579 static int ctnetlink_done(struct netlink_callback *cb)
580 {
581 if (cb->args[1])
582 nf_ct_put((struct nf_conn *)cb->args[1]);
583 return 0;
584 }
585
586 static int
587 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
588 {
589 struct nf_conn *ct, *last;
590 struct nf_conntrack_tuple_hash *h;
591 struct hlist_nulls_node *n;
592 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
593 u_int8_t l3proto = nfmsg->nfgen_family;
594
595 rcu_read_lock();
596 last = (struct nf_conn *)cb->args[1];
597 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
598 restart:
599 hlist_nulls_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
600 hnnode) {
601 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
602 continue;
603 ct = nf_ct_tuplehash_to_ctrack(h);
604 if (!atomic_inc_not_zero(&ct->ct_general.use))
605 continue;
606 /* Dump entries of a given L3 protocol number.
607 * If it is not specified, ie. l3proto == 0,
608 * then dump everything. */
609 if (l3proto && nf_ct_l3num(ct) != l3proto)
610 goto releasect;
611 if (cb->args[1]) {
612 if (ct != last)
613 goto releasect;
614 cb->args[1] = 0;
615 }
616 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
617 cb->nlh->nlmsg_seq,
618 IPCTNL_MSG_CT_NEW, ct) < 0) {
619 cb->args[1] = (unsigned long)ct;
620 goto out;
621 }
622
623 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
624 IPCTNL_MSG_CT_GET_CTRZERO) {
625 struct nf_conn_counter *acct;
626
627 acct = nf_conn_acct_find(ct);
628 if (acct)
629 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
630 }
631 releasect:
632 nf_ct_put(ct);
633 }
634 if (cb->args[1]) {
635 cb->args[1] = 0;
636 goto restart;
637 }
638 }
639 out:
640 rcu_read_unlock();
641 if (last)
642 nf_ct_put(last);
643
644 return skb->len;
645 }
646
647 static inline int
648 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
649 {
650 struct nlattr *tb[CTA_IP_MAX+1];
651 struct nf_conntrack_l3proto *l3proto;
652 int ret = 0;
653
654 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
655
656 rcu_read_lock();
657 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
658
659 if (likely(l3proto->nlattr_to_tuple)) {
660 ret = nla_validate_nested(attr, CTA_IP_MAX,
661 l3proto->nla_policy);
662 if (ret == 0)
663 ret = l3proto->nlattr_to_tuple(tb, tuple);
664 }
665
666 rcu_read_unlock();
667
668 return ret;
669 }
670
671 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
672 [CTA_PROTO_NUM] = { .type = NLA_U8 },
673 };
674
675 static inline int
676 ctnetlink_parse_tuple_proto(struct nlattr *attr,
677 struct nf_conntrack_tuple *tuple)
678 {
679 struct nlattr *tb[CTA_PROTO_MAX+1];
680 struct nf_conntrack_l4proto *l4proto;
681 int ret = 0;
682
683 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
684 if (ret < 0)
685 return ret;
686
687 if (!tb[CTA_PROTO_NUM])
688 return -EINVAL;
689 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
690
691 rcu_read_lock();
692 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
693
694 if (likely(l4proto->nlattr_to_tuple)) {
695 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
696 l4proto->nla_policy);
697 if (ret == 0)
698 ret = l4proto->nlattr_to_tuple(tb, tuple);
699 }
700
701 rcu_read_unlock();
702
703 return ret;
704 }
705
706 static int
707 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
708 enum ctattr_tuple type, u_int8_t l3num)
709 {
710 struct nlattr *tb[CTA_TUPLE_MAX+1];
711 int err;
712
713 memset(tuple, 0, sizeof(*tuple));
714
715 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
716
717 if (!tb[CTA_TUPLE_IP])
718 return -EINVAL;
719
720 tuple->src.l3num = l3num;
721
722 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
723 if (err < 0)
724 return err;
725
726 if (!tb[CTA_TUPLE_PROTO])
727 return -EINVAL;
728
729 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
730 if (err < 0)
731 return err;
732
733 /* orig and expect tuples get DIR_ORIGINAL */
734 if (type == CTA_TUPLE_REPLY)
735 tuple->dst.dir = IP_CT_DIR_REPLY;
736 else
737 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
738
739 return 0;
740 }
741
742 static inline int
743 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
744 {
745 struct nlattr *tb[CTA_HELP_MAX+1];
746
747 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
748
749 if (!tb[CTA_HELP_NAME])
750 return -EINVAL;
751
752 *helper_name = nla_data(tb[CTA_HELP_NAME]);
753
754 return 0;
755 }
756
757 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
758 [CTA_STATUS] = { .type = NLA_U32 },
759 [CTA_TIMEOUT] = { .type = NLA_U32 },
760 [CTA_MARK] = { .type = NLA_U32 },
761 [CTA_USE] = { .type = NLA_U32 },
762 [CTA_ID] = { .type = NLA_U32 },
763 };
764
765 static int
766 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
767 struct nlmsghdr *nlh, struct nlattr *cda[])
768 {
769 struct nf_conntrack_tuple_hash *h;
770 struct nf_conntrack_tuple tuple;
771 struct nf_conn *ct;
772 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
773 u_int8_t u3 = nfmsg->nfgen_family;
774 int err = 0;
775
776 if (cda[CTA_TUPLE_ORIG])
777 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
778 else if (cda[CTA_TUPLE_REPLY])
779 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
780 else {
781 /* Flush the whole table */
782 nf_conntrack_flush_report(&init_net,
783 NETLINK_CB(skb).pid,
784 nlmsg_report(nlh));
785 return 0;
786 }
787
788 if (err < 0)
789 return err;
790
791 h = nf_conntrack_find_get(&init_net, &tuple);
792 if (!h)
793 return -ENOENT;
794
795 ct = nf_ct_tuplehash_to_ctrack(h);
796
797 if (cda[CTA_ID]) {
798 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
799 if (id != (u32)(unsigned long)ct) {
800 nf_ct_put(ct);
801 return -ENOENT;
802 }
803 }
804
805 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
806 NETLINK_CB(skb).pid,
807 nlmsg_report(nlh)) < 0) {
808 nf_ct_delete_from_lists(ct);
809 /* we failed to report the event, try later */
810 nf_ct_insert_dying_list(ct);
811 nf_ct_put(ct);
812 return 0;
813 }
814
815 /* death_by_timeout would report the event again */
816 set_bit(IPS_DYING_BIT, &ct->status);
817
818 nf_ct_kill(ct);
819 nf_ct_put(ct);
820
821 return 0;
822 }
823
824 static int
825 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
826 struct nlmsghdr *nlh, struct nlattr *cda[])
827 {
828 struct nf_conntrack_tuple_hash *h;
829 struct nf_conntrack_tuple tuple;
830 struct nf_conn *ct;
831 struct sk_buff *skb2 = NULL;
832 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
833 u_int8_t u3 = nfmsg->nfgen_family;
834 int err = 0;
835
836 if (nlh->nlmsg_flags & NLM_F_DUMP)
837 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
838 ctnetlink_done);
839
840 if (cda[CTA_TUPLE_ORIG])
841 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
842 else if (cda[CTA_TUPLE_REPLY])
843 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
844 else
845 return -EINVAL;
846
847 if (err < 0)
848 return err;
849
850 h = nf_conntrack_find_get(&init_net, &tuple);
851 if (!h)
852 return -ENOENT;
853
854 ct = nf_ct_tuplehash_to_ctrack(h);
855
856 err = -ENOMEM;
857 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
858 if (skb2 == NULL) {
859 nf_ct_put(ct);
860 return -ENOMEM;
861 }
862
863 rcu_read_lock();
864 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
865 IPCTNL_MSG_CT_NEW, ct);
866 rcu_read_unlock();
867 nf_ct_put(ct);
868 if (err <= 0)
869 goto free;
870
871 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
872 if (err < 0)
873 goto out;
874
875 return 0;
876
877 free:
878 kfree_skb(skb2);
879 out:
880 return err;
881 }
882
883 #ifdef CONFIG_NF_NAT_NEEDED
884 static int
885 ctnetlink_parse_nat_setup(struct nf_conn *ct,
886 enum nf_nat_manip_type manip,
887 struct nlattr *attr)
888 {
889 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
890
891 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
892 if (!parse_nat_setup) {
893 #ifdef CONFIG_MODULES
894 rcu_read_unlock();
895 spin_unlock_bh(&nf_conntrack_lock);
896 nfnl_unlock();
897 if (request_module("nf-nat-ipv4") < 0) {
898 nfnl_lock();
899 spin_lock_bh(&nf_conntrack_lock);
900 rcu_read_lock();
901 return -EOPNOTSUPP;
902 }
903 nfnl_lock();
904 spin_lock_bh(&nf_conntrack_lock);
905 rcu_read_lock();
906 if (nfnetlink_parse_nat_setup_hook)
907 return -EAGAIN;
908 #endif
909 return -EOPNOTSUPP;
910 }
911
912 return parse_nat_setup(ct, manip, attr);
913 }
914 #endif
915
916 static int
917 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
918 {
919 unsigned long d;
920 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
921 d = ct->status ^ status;
922
923 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
924 /* unchangeable */
925 return -EBUSY;
926
927 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
928 /* SEEN_REPLY bit can only be set */
929 return -EBUSY;
930
931 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
932 /* ASSURED bit can only be set */
933 return -EBUSY;
934
935 /* Be careful here, modifying NAT bits can screw up things,
936 * so don't let users modify them directly if they don't pass
937 * nf_nat_range. */
938 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
939 return 0;
940 }
941
942 static int
943 ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[])
944 {
945 #ifdef CONFIG_NF_NAT_NEEDED
946 int ret;
947
948 if (cda[CTA_NAT_DST]) {
949 ret = ctnetlink_parse_nat_setup(ct,
950 IP_NAT_MANIP_DST,
951 cda[CTA_NAT_DST]);
952 if (ret < 0)
953 return ret;
954 }
955 if (cda[CTA_NAT_SRC]) {
956 ret = ctnetlink_parse_nat_setup(ct,
957 IP_NAT_MANIP_SRC,
958 cda[CTA_NAT_SRC]);
959 if (ret < 0)
960 return ret;
961 }
962 return 0;
963 #else
964 return -EOPNOTSUPP;
965 #endif
966 }
967
968 static inline int
969 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
970 {
971 struct nf_conntrack_helper *helper;
972 struct nf_conn_help *help = nfct_help(ct);
973 char *helpname = NULL;
974 int err;
975
976 /* don't change helper of sibling connections */
977 if (ct->master)
978 return -EBUSY;
979
980 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
981 if (err < 0)
982 return err;
983
984 if (!strcmp(helpname, "")) {
985 if (help && help->helper) {
986 /* we had a helper before ... */
987 nf_ct_remove_expectations(ct);
988 rcu_assign_pointer(help->helper, NULL);
989 }
990
991 return 0;
992 }
993
994 helper = __nf_conntrack_helper_find_byname(helpname);
995 if (helper == NULL) {
996 #ifdef CONFIG_MODULES
997 spin_unlock_bh(&nf_conntrack_lock);
998
999 if (request_module("nfct-helper-%s", helpname) < 0) {
1000 spin_lock_bh(&nf_conntrack_lock);
1001 return -EOPNOTSUPP;
1002 }
1003
1004 spin_lock_bh(&nf_conntrack_lock);
1005 helper = __nf_conntrack_helper_find_byname(helpname);
1006 if (helper)
1007 return -EAGAIN;
1008 #endif
1009 return -EOPNOTSUPP;
1010 }
1011
1012 if (help) {
1013 if (help->helper == helper)
1014 return 0;
1015 if (help->helper)
1016 return -EBUSY;
1017 /* need to zero data of old helper */
1018 memset(&help->help, 0, sizeof(help->help));
1019 } else {
1020 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1021 if (help == NULL)
1022 return -ENOMEM;
1023 }
1024
1025 rcu_assign_pointer(help->helper, helper);
1026
1027 return 0;
1028 }
1029
1030 static inline int
1031 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
1032 {
1033 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1034
1035 if (!del_timer(&ct->timeout))
1036 return -ETIME;
1037
1038 ct->timeout.expires = jiffies + timeout * HZ;
1039 add_timer(&ct->timeout);
1040
1041 return 0;
1042 }
1043
1044 static inline int
1045 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1046 {
1047 struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1048 struct nf_conntrack_l4proto *l4proto;
1049 int err = 0;
1050
1051 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1052
1053 rcu_read_lock();
1054 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1055 if (l4proto->from_nlattr)
1056 err = l4proto->from_nlattr(tb, ct);
1057 rcu_read_unlock();
1058
1059 return err;
1060 }
1061
1062 #ifdef CONFIG_NF_NAT_NEEDED
1063 static inline int
1064 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1065 {
1066 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1067
1068 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1069
1070 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1071 return -EINVAL;
1072
1073 natseq->correction_pos =
1074 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1075
1076 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1077 return -EINVAL;
1078
1079 natseq->offset_before =
1080 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1081
1082 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1083 return -EINVAL;
1084
1085 natseq->offset_after =
1086 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1087
1088 return 0;
1089 }
1090
1091 static int
1092 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1093 {
1094 int ret = 0;
1095 struct nf_conn_nat *nat = nfct_nat(ct);
1096
1097 if (!nat)
1098 return 0;
1099
1100 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1101 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1102 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1103 if (ret < 0)
1104 return ret;
1105
1106 ct->status |= IPS_SEQ_ADJUST;
1107 }
1108
1109 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1110 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1111 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1112 if (ret < 0)
1113 return ret;
1114
1115 ct->status |= IPS_SEQ_ADJUST;
1116 }
1117
1118 return 0;
1119 }
1120 #endif
1121
1122 static int
1123 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1124 {
1125 int err;
1126
1127 /* only allow NAT changes and master assignation for new conntracks */
1128 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1129 return -EOPNOTSUPP;
1130
1131 if (cda[CTA_HELP]) {
1132 err = ctnetlink_change_helper(ct, cda);
1133 if (err < 0)
1134 return err;
1135 }
1136
1137 if (cda[CTA_TIMEOUT]) {
1138 err = ctnetlink_change_timeout(ct, cda);
1139 if (err < 0)
1140 return err;
1141 }
1142
1143 if (cda[CTA_STATUS]) {
1144 err = ctnetlink_change_status(ct, cda);
1145 if (err < 0)
1146 return err;
1147 }
1148
1149 if (cda[CTA_PROTOINFO]) {
1150 err = ctnetlink_change_protoinfo(ct, cda);
1151 if (err < 0)
1152 return err;
1153 }
1154
1155 #if defined(CONFIG_NF_CONNTRACK_MARK)
1156 if (cda[CTA_MARK])
1157 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1158 #endif
1159
1160 #ifdef CONFIG_NF_NAT_NEEDED
1161 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1162 err = ctnetlink_change_nat_seq_adj(ct, cda);
1163 if (err < 0)
1164 return err;
1165 }
1166 #endif
1167
1168 return 0;
1169 }
1170
1171 static struct nf_conn *
1172 ctnetlink_create_conntrack(struct nlattr *cda[],
1173 struct nf_conntrack_tuple *otuple,
1174 struct nf_conntrack_tuple *rtuple,
1175 u8 u3)
1176 {
1177 struct nf_conn *ct;
1178 int err = -EINVAL;
1179 struct nf_conntrack_helper *helper;
1180
1181 ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_ATOMIC);
1182 if (IS_ERR(ct))
1183 return ERR_PTR(-ENOMEM);
1184
1185 if (!cda[CTA_TIMEOUT])
1186 goto err1;
1187 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1188
1189 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1190 ct->status |= IPS_CONFIRMED;
1191
1192 rcu_read_lock();
1193 if (cda[CTA_HELP]) {
1194 char *helpname = NULL;
1195
1196 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1197 if (err < 0)
1198 goto err2;
1199
1200 helper = __nf_conntrack_helper_find_byname(helpname);
1201 if (helper == NULL) {
1202 rcu_read_unlock();
1203 #ifdef CONFIG_MODULES
1204 if (request_module("nfct-helper-%s", helpname) < 0) {
1205 err = -EOPNOTSUPP;
1206 goto err1;
1207 }
1208
1209 rcu_read_lock();
1210 helper = __nf_conntrack_helper_find_byname(helpname);
1211 if (helper) {
1212 err = -EAGAIN;
1213 goto err2;
1214 }
1215 rcu_read_unlock();
1216 #endif
1217 err = -EOPNOTSUPP;
1218 goto err1;
1219 } else {
1220 struct nf_conn_help *help;
1221
1222 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1223 if (help == NULL) {
1224 err = -ENOMEM;
1225 goto err2;
1226 }
1227
1228 /* not in hash table yet so not strictly necessary */
1229 rcu_assign_pointer(help->helper, helper);
1230 }
1231 } else {
1232 /* try an implicit helper assignation */
1233 err = __nf_ct_try_assign_helper(ct, GFP_ATOMIC);
1234 if (err < 0)
1235 goto err2;
1236 }
1237
1238 if (cda[CTA_STATUS]) {
1239 err = ctnetlink_change_status(ct, cda);
1240 if (err < 0)
1241 goto err2;
1242 }
1243
1244 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1245 err = ctnetlink_change_nat(ct, cda);
1246 if (err < 0)
1247 goto err2;
1248 }
1249
1250 #ifdef CONFIG_NF_NAT_NEEDED
1251 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1252 err = ctnetlink_change_nat_seq_adj(ct, cda);
1253 if (err < 0)
1254 goto err2;
1255 }
1256 #endif
1257
1258 if (cda[CTA_PROTOINFO]) {
1259 err = ctnetlink_change_protoinfo(ct, cda);
1260 if (err < 0)
1261 goto err2;
1262 }
1263
1264 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1265 nf_ct_ecache_ext_add(ct, GFP_ATOMIC);
1266
1267 #if defined(CONFIG_NF_CONNTRACK_MARK)
1268 if (cda[CTA_MARK])
1269 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1270 #endif
1271
1272 /* setup master conntrack: this is a confirmed expectation */
1273 if (cda[CTA_TUPLE_MASTER]) {
1274 struct nf_conntrack_tuple master;
1275 struct nf_conntrack_tuple_hash *master_h;
1276 struct nf_conn *master_ct;
1277
1278 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1279 if (err < 0)
1280 goto err2;
1281
1282 master_h = nf_conntrack_find_get(&init_net, &master);
1283 if (master_h == NULL) {
1284 err = -ENOENT;
1285 goto err2;
1286 }
1287 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1288 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1289 ct->master = master_ct;
1290 }
1291
1292 add_timer(&ct->timeout);
1293 nf_conntrack_hash_insert(ct);
1294 rcu_read_unlock();
1295
1296 return ct;
1297
1298 err2:
1299 rcu_read_unlock();
1300 err1:
1301 nf_conntrack_free(ct);
1302 return ERR_PTR(err);
1303 }
1304
1305 static int
1306 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1307 struct nlmsghdr *nlh, struct nlattr *cda[])
1308 {
1309 struct nf_conntrack_tuple otuple, rtuple;
1310 struct nf_conntrack_tuple_hash *h = NULL;
1311 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1312 u_int8_t u3 = nfmsg->nfgen_family;
1313 int err = 0;
1314
1315 if (cda[CTA_TUPLE_ORIG]) {
1316 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1317 if (err < 0)
1318 return err;
1319 }
1320
1321 if (cda[CTA_TUPLE_REPLY]) {
1322 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1323 if (err < 0)
1324 return err;
1325 }
1326
1327 spin_lock_bh(&nf_conntrack_lock);
1328 if (cda[CTA_TUPLE_ORIG])
1329 h = __nf_conntrack_find(&init_net, &otuple);
1330 else if (cda[CTA_TUPLE_REPLY])
1331 h = __nf_conntrack_find(&init_net, &rtuple);
1332
1333 if (h == NULL) {
1334 err = -ENOENT;
1335 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1336 struct nf_conn *ct;
1337 enum ip_conntrack_events events;
1338
1339 ct = ctnetlink_create_conntrack(cda, &otuple,
1340 &rtuple, u3);
1341 if (IS_ERR(ct)) {
1342 err = PTR_ERR(ct);
1343 goto out_unlock;
1344 }
1345 err = 0;
1346 nf_conntrack_get(&ct->ct_general);
1347 spin_unlock_bh(&nf_conntrack_lock);
1348 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1349 events = IPCT_RELATED;
1350 else
1351 events = IPCT_NEW;
1352
1353 nf_conntrack_eventmask_report((1 << IPCT_STATUS) |
1354 (1 << IPCT_HELPER) |
1355 (1 << IPCT_PROTOINFO) |
1356 (1 << IPCT_NATSEQADJ) |
1357 (1 << IPCT_MARK) | events,
1358 ct, NETLINK_CB(skb).pid,
1359 nlmsg_report(nlh));
1360 nf_ct_put(ct);
1361 } else
1362 spin_unlock_bh(&nf_conntrack_lock);
1363
1364 return err;
1365 }
1366 /* implicit 'else' */
1367
1368 /* We manipulate the conntrack inside the global conntrack table lock,
1369 * so there's no need to increase the refcount */
1370 err = -EEXIST;
1371 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1372 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1373
1374 err = ctnetlink_change_conntrack(ct, cda);
1375 if (err == 0) {
1376 nf_conntrack_get(&ct->ct_general);
1377 spin_unlock_bh(&nf_conntrack_lock);
1378 nf_conntrack_eventmask_report((1 << IPCT_STATUS) |
1379 (1 << IPCT_HELPER) |
1380 (1 << IPCT_PROTOINFO) |
1381 (1 << IPCT_NATSEQADJ) |
1382 (1 << IPCT_MARK),
1383 ct, NETLINK_CB(skb).pid,
1384 nlmsg_report(nlh));
1385 nf_ct_put(ct);
1386 } else
1387 spin_unlock_bh(&nf_conntrack_lock);
1388
1389 return err;
1390 }
1391
1392 out_unlock:
1393 spin_unlock_bh(&nf_conntrack_lock);
1394 return err;
1395 }
1396
1397 /***********************************************************************
1398 * EXPECT
1399 ***********************************************************************/
1400
1401 static inline int
1402 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1403 const struct nf_conntrack_tuple *tuple,
1404 enum ctattr_expect type)
1405 {
1406 struct nlattr *nest_parms;
1407
1408 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1409 if (!nest_parms)
1410 goto nla_put_failure;
1411 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1412 goto nla_put_failure;
1413 nla_nest_end(skb, nest_parms);
1414
1415 return 0;
1416
1417 nla_put_failure:
1418 return -1;
1419 }
1420
1421 static inline int
1422 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1423 const struct nf_conntrack_tuple *tuple,
1424 const struct nf_conntrack_tuple_mask *mask)
1425 {
1426 int ret;
1427 struct nf_conntrack_l3proto *l3proto;
1428 struct nf_conntrack_l4proto *l4proto;
1429 struct nf_conntrack_tuple m;
1430 struct nlattr *nest_parms;
1431
1432 memset(&m, 0xFF, sizeof(m));
1433 m.src.u.all = mask->src.u.all;
1434 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1435
1436 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1437 if (!nest_parms)
1438 goto nla_put_failure;
1439
1440 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1441 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1442
1443 if (unlikely(ret < 0))
1444 goto nla_put_failure;
1445
1446 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1447 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1448 if (unlikely(ret < 0))
1449 goto nla_put_failure;
1450
1451 nla_nest_end(skb, nest_parms);
1452
1453 return 0;
1454
1455 nla_put_failure:
1456 return -1;
1457 }
1458
1459 static int
1460 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1461 const struct nf_conntrack_expect *exp)
1462 {
1463 struct nf_conn *master = exp->master;
1464 long timeout = (exp->timeout.expires - jiffies) / HZ;
1465
1466 if (timeout < 0)
1467 timeout = 0;
1468
1469 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1470 goto nla_put_failure;
1471 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1472 goto nla_put_failure;
1473 if (ctnetlink_exp_dump_tuple(skb,
1474 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1475 CTA_EXPECT_MASTER) < 0)
1476 goto nla_put_failure;
1477
1478 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1479 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1480
1481 return 0;
1482
1483 nla_put_failure:
1484 return -1;
1485 }
1486
1487 static int
1488 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1489 int event, const struct nf_conntrack_expect *exp)
1490 {
1491 struct nlmsghdr *nlh;
1492 struct nfgenmsg *nfmsg;
1493 unsigned int flags = pid ? NLM_F_MULTI : 0;
1494
1495 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1496 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1497 if (nlh == NULL)
1498 goto nlmsg_failure;
1499
1500 nfmsg = nlmsg_data(nlh);
1501 nfmsg->nfgen_family = exp->tuple.src.l3num;
1502 nfmsg->version = NFNETLINK_V0;
1503 nfmsg->res_id = 0;
1504
1505 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1506 goto nla_put_failure;
1507
1508 nlmsg_end(skb, nlh);
1509 return skb->len;
1510
1511 nlmsg_failure:
1512 nla_put_failure:
1513 nlmsg_cancel(skb, nlh);
1514 return -1;
1515 }
1516
1517 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1518 static int
1519 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1520 {
1521 struct nlmsghdr *nlh;
1522 struct nfgenmsg *nfmsg;
1523 struct nf_conntrack_expect *exp = item->exp;
1524 struct sk_buff *skb;
1525 unsigned int type;
1526 int flags = 0;
1527
1528 if (events & (1 << IPEXP_NEW)) {
1529 type = IPCTNL_MSG_EXP_NEW;
1530 flags = NLM_F_CREATE|NLM_F_EXCL;
1531 } else
1532 return 0;
1533
1534 if (!item->report &&
1535 !nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1536 return 0;
1537
1538 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1539 if (skb == NULL)
1540 goto errout;
1541
1542 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1543 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1544 if (nlh == NULL)
1545 goto nlmsg_failure;
1546
1547 nfmsg = nlmsg_data(nlh);
1548 nfmsg->nfgen_family = exp->tuple.src.l3num;
1549 nfmsg->version = NFNETLINK_V0;
1550 nfmsg->res_id = 0;
1551
1552 rcu_read_lock();
1553 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1554 goto nla_put_failure;
1555 rcu_read_unlock();
1556
1557 nlmsg_end(skb, nlh);
1558 nfnetlink_send(skb, item->pid, NFNLGRP_CONNTRACK_EXP_NEW,
1559 item->report, GFP_ATOMIC);
1560 return 0;
1561
1562 nla_put_failure:
1563 rcu_read_unlock();
1564 nlmsg_cancel(skb, nlh);
1565 nlmsg_failure:
1566 kfree_skb(skb);
1567 errout:
1568 nfnetlink_set_err(0, 0, -ENOBUFS);
1569 return 0;
1570 }
1571 #endif
1572 static int ctnetlink_exp_done(struct netlink_callback *cb)
1573 {
1574 if (cb->args[1])
1575 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1576 return 0;
1577 }
1578
1579 static int
1580 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1581 {
1582 struct net *net = &init_net;
1583 struct nf_conntrack_expect *exp, *last;
1584 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1585 struct hlist_node *n;
1586 u_int8_t l3proto = nfmsg->nfgen_family;
1587
1588 rcu_read_lock();
1589 last = (struct nf_conntrack_expect *)cb->args[1];
1590 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1591 restart:
1592 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1593 hnode) {
1594 if (l3proto && exp->tuple.src.l3num != l3proto)
1595 continue;
1596 if (cb->args[1]) {
1597 if (exp != last)
1598 continue;
1599 cb->args[1] = 0;
1600 }
1601 if (ctnetlink_exp_fill_info(skb,
1602 NETLINK_CB(cb->skb).pid,
1603 cb->nlh->nlmsg_seq,
1604 IPCTNL_MSG_EXP_NEW,
1605 exp) < 0) {
1606 if (!atomic_inc_not_zero(&exp->use))
1607 continue;
1608 cb->args[1] = (unsigned long)exp;
1609 goto out;
1610 }
1611 }
1612 if (cb->args[1]) {
1613 cb->args[1] = 0;
1614 goto restart;
1615 }
1616 }
1617 out:
1618 rcu_read_unlock();
1619 if (last)
1620 nf_ct_expect_put(last);
1621
1622 return skb->len;
1623 }
1624
1625 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1626 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1627 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1628 };
1629
1630 static int
1631 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1632 struct nlmsghdr *nlh, struct nlattr *cda[])
1633 {
1634 struct nf_conntrack_tuple tuple;
1635 struct nf_conntrack_expect *exp;
1636 struct sk_buff *skb2;
1637 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1638 u_int8_t u3 = nfmsg->nfgen_family;
1639 int err = 0;
1640
1641 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1642 return netlink_dump_start(ctnl, skb, nlh,
1643 ctnetlink_exp_dump_table,
1644 ctnetlink_exp_done);
1645 }
1646
1647 if (cda[CTA_EXPECT_MASTER])
1648 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1649 else
1650 return -EINVAL;
1651
1652 if (err < 0)
1653 return err;
1654
1655 exp = nf_ct_expect_find_get(&init_net, &tuple);
1656 if (!exp)
1657 return -ENOENT;
1658
1659 if (cda[CTA_EXPECT_ID]) {
1660 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1661 if (ntohl(id) != (u32)(unsigned long)exp) {
1662 nf_ct_expect_put(exp);
1663 return -ENOENT;
1664 }
1665 }
1666
1667 err = -ENOMEM;
1668 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1669 if (skb2 == NULL)
1670 goto out;
1671
1672 rcu_read_lock();
1673 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1674 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1675 rcu_read_unlock();
1676 if (err <= 0)
1677 goto free;
1678
1679 nf_ct_expect_put(exp);
1680
1681 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1682
1683 free:
1684 kfree_skb(skb2);
1685 out:
1686 nf_ct_expect_put(exp);
1687 return err;
1688 }
1689
1690 static int
1691 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1692 struct nlmsghdr *nlh, struct nlattr *cda[])
1693 {
1694 struct nf_conntrack_expect *exp;
1695 struct nf_conntrack_tuple tuple;
1696 struct nf_conntrack_helper *h;
1697 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1698 struct hlist_node *n, *next;
1699 u_int8_t u3 = nfmsg->nfgen_family;
1700 unsigned int i;
1701 int err;
1702
1703 if (cda[CTA_EXPECT_TUPLE]) {
1704 /* delete a single expect by tuple */
1705 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1706 if (err < 0)
1707 return err;
1708
1709 /* bump usage count to 2 */
1710 exp = nf_ct_expect_find_get(&init_net, &tuple);
1711 if (!exp)
1712 return -ENOENT;
1713
1714 if (cda[CTA_EXPECT_ID]) {
1715 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1716 if (ntohl(id) != (u32)(unsigned long)exp) {
1717 nf_ct_expect_put(exp);
1718 return -ENOENT;
1719 }
1720 }
1721
1722 /* after list removal, usage count == 1 */
1723 nf_ct_unexpect_related(exp);
1724 /* have to put what we 'get' above.
1725 * after this line usage count == 0 */
1726 nf_ct_expect_put(exp);
1727 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1728 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1729 struct nf_conn_help *m_help;
1730
1731 /* delete all expectations for this helper */
1732 spin_lock_bh(&nf_conntrack_lock);
1733 h = __nf_conntrack_helper_find_byname(name);
1734 if (!h) {
1735 spin_unlock_bh(&nf_conntrack_lock);
1736 return -EOPNOTSUPP;
1737 }
1738 for (i = 0; i < nf_ct_expect_hsize; i++) {
1739 hlist_for_each_entry_safe(exp, n, next,
1740 &init_net.ct.expect_hash[i],
1741 hnode) {
1742 m_help = nfct_help(exp->master);
1743 if (m_help->helper == h
1744 && del_timer(&exp->timeout)) {
1745 nf_ct_unlink_expect(exp);
1746 nf_ct_expect_put(exp);
1747 }
1748 }
1749 }
1750 spin_unlock_bh(&nf_conntrack_lock);
1751 } else {
1752 /* This basically means we have to flush everything*/
1753 spin_lock_bh(&nf_conntrack_lock);
1754 for (i = 0; i < nf_ct_expect_hsize; i++) {
1755 hlist_for_each_entry_safe(exp, n, next,
1756 &init_net.ct.expect_hash[i],
1757 hnode) {
1758 if (del_timer(&exp->timeout)) {
1759 nf_ct_unlink_expect(exp);
1760 nf_ct_expect_put(exp);
1761 }
1762 }
1763 }
1764 spin_unlock_bh(&nf_conntrack_lock);
1765 }
1766
1767 return 0;
1768 }
1769 static int
1770 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1771 {
1772 return -EOPNOTSUPP;
1773 }
1774
1775 static int
1776 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3, u32 pid, int report)
1777 {
1778 struct nf_conntrack_tuple tuple, mask, master_tuple;
1779 struct nf_conntrack_tuple_hash *h = NULL;
1780 struct nf_conntrack_expect *exp;
1781 struct nf_conn *ct;
1782 struct nf_conn_help *help;
1783 int err = 0;
1784
1785 /* caller guarantees that those three CTA_EXPECT_* exist */
1786 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1787 if (err < 0)
1788 return err;
1789 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1790 if (err < 0)
1791 return err;
1792 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1793 if (err < 0)
1794 return err;
1795
1796 /* Look for master conntrack of this expectation */
1797 h = nf_conntrack_find_get(&init_net, &master_tuple);
1798 if (!h)
1799 return -ENOENT;
1800 ct = nf_ct_tuplehash_to_ctrack(h);
1801 help = nfct_help(ct);
1802
1803 if (!help || !help->helper) {
1804 /* such conntrack hasn't got any helper, abort */
1805 err = -EOPNOTSUPP;
1806 goto out;
1807 }
1808
1809 exp = nf_ct_expect_alloc(ct);
1810 if (!exp) {
1811 err = -ENOMEM;
1812 goto out;
1813 }
1814
1815 exp->class = 0;
1816 exp->expectfn = NULL;
1817 exp->flags = 0;
1818 exp->master = ct;
1819 exp->helper = NULL;
1820 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1821 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1822 exp->mask.src.u.all = mask.src.u.all;
1823
1824 err = nf_ct_expect_related_report(exp, pid, report);
1825 nf_ct_expect_put(exp);
1826
1827 out:
1828 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1829 return err;
1830 }
1831
1832 static int
1833 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1834 struct nlmsghdr *nlh, struct nlattr *cda[])
1835 {
1836 struct nf_conntrack_tuple tuple;
1837 struct nf_conntrack_expect *exp;
1838 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1839 u_int8_t u3 = nfmsg->nfgen_family;
1840 int err = 0;
1841
1842 if (!cda[CTA_EXPECT_TUPLE]
1843 || !cda[CTA_EXPECT_MASK]
1844 || !cda[CTA_EXPECT_MASTER])
1845 return -EINVAL;
1846
1847 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1848 if (err < 0)
1849 return err;
1850
1851 spin_lock_bh(&nf_conntrack_lock);
1852 exp = __nf_ct_expect_find(&init_net, &tuple);
1853
1854 if (!exp) {
1855 spin_unlock_bh(&nf_conntrack_lock);
1856 err = -ENOENT;
1857 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1858 err = ctnetlink_create_expect(cda,
1859 u3,
1860 NETLINK_CB(skb).pid,
1861 nlmsg_report(nlh));
1862 }
1863 return err;
1864 }
1865
1866 err = -EEXIST;
1867 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1868 err = ctnetlink_change_expect(exp, cda);
1869 spin_unlock_bh(&nf_conntrack_lock);
1870
1871 return err;
1872 }
1873
1874 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1875 static struct nf_ct_event_notifier ctnl_notifier = {
1876 .fcn = ctnetlink_conntrack_event,
1877 };
1878
1879 static struct nf_exp_event_notifier ctnl_notifier_exp = {
1880 .fcn = ctnetlink_expect_event,
1881 };
1882 #endif
1883
1884 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1885 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1886 .attr_count = CTA_MAX,
1887 .policy = ct_nla_policy },
1888 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1889 .attr_count = CTA_MAX,
1890 .policy = ct_nla_policy },
1891 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1892 .attr_count = CTA_MAX,
1893 .policy = ct_nla_policy },
1894 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1895 .attr_count = CTA_MAX,
1896 .policy = ct_nla_policy },
1897 };
1898
1899 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1900 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1901 .attr_count = CTA_EXPECT_MAX,
1902 .policy = exp_nla_policy },
1903 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1904 .attr_count = CTA_EXPECT_MAX,
1905 .policy = exp_nla_policy },
1906 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1907 .attr_count = CTA_EXPECT_MAX,
1908 .policy = exp_nla_policy },
1909 };
1910
1911 static const struct nfnetlink_subsystem ctnl_subsys = {
1912 .name = "conntrack",
1913 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1914 .cb_count = IPCTNL_MSG_MAX,
1915 .cb = ctnl_cb,
1916 };
1917
1918 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1919 .name = "conntrack_expect",
1920 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1921 .cb_count = IPCTNL_MSG_EXP_MAX,
1922 .cb = ctnl_exp_cb,
1923 };
1924
1925 MODULE_ALIAS("ip_conntrack_netlink");
1926 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1927 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1928
1929 static int __init ctnetlink_init(void)
1930 {
1931 int ret;
1932
1933 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1934 ret = nfnetlink_subsys_register(&ctnl_subsys);
1935 if (ret < 0) {
1936 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1937 goto err_out;
1938 }
1939
1940 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1941 if (ret < 0) {
1942 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1943 goto err_unreg_subsys;
1944 }
1945
1946 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1947 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1948 if (ret < 0) {
1949 printk("ctnetlink_init: cannot register notifier.\n");
1950 goto err_unreg_exp_subsys;
1951 }
1952
1953 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1954 if (ret < 0) {
1955 printk("ctnetlink_init: cannot expect register notifier.\n");
1956 goto err_unreg_notifier;
1957 }
1958 #endif
1959
1960 return 0;
1961
1962 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1963 err_unreg_notifier:
1964 nf_conntrack_unregister_notifier(&ctnl_notifier);
1965 err_unreg_exp_subsys:
1966 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1967 #endif
1968 err_unreg_subsys:
1969 nfnetlink_subsys_unregister(&ctnl_subsys);
1970 err_out:
1971 return ret;
1972 }
1973
1974 static void __exit ctnetlink_exit(void)
1975 {
1976 printk("ctnetlink: unregistering from nfnetlink.\n");
1977
1978 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1979 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1980 nf_conntrack_unregister_notifier(&ctnl_notifier);
1981 #endif
1982
1983 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1984 nfnetlink_subsys_unregister(&ctnl_subsys);
1985 return;
1986 }
1987
1988 module_init(ctnetlink_init);
1989 module_exit(ctnetlink_exit);
Linux for Ginger Game Console