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OMAP3: PM: Ensure MUSB block can idle when driver not loaded
[linux-ginger.git] / net / netfilter / nf_conntrack_netlink.c
blobc523f0b8cee53bd9e304af4db77a4a474c44bcbe
1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/skbuff.h>
26 #include <linux/errno.h>
27 #include <linux/netlink.h>
28 #include <linux/spinlock.h>
29 #include <linux/interrupt.h>
30 #include <linux/notifier.h>
31
32 #include <linux/netfilter.h>
33 #include <net/netlink.h>
34 #include <net/netfilter/nf_conntrack.h>
35 #include <net/netfilter/nf_conntrack_core.h>
36 #include <net/netfilter/nf_conntrack_expect.h>
37 #include <net/netfilter/nf_conntrack_helper.h>
38 #include <net/netfilter/nf_conntrack_l3proto.h>
39 #include <net/netfilter/nf_conntrack_l4proto.h>
40 #include <net/netfilter/nf_conntrack_tuple.h>
41 #include <net/netfilter/nf_conntrack_acct.h>
42 #ifdef CONFIG_NF_NAT_NEEDED
43 #include <net/netfilter/nf_nat_core.h>
44 #include <net/netfilter/nf_nat_protocol.h>
45 #endif
46
47 #include <linux/netfilter/nfnetlink.h>
48 #include <linux/netfilter/nfnetlink_conntrack.h>
49
50 MODULE_LICENSE("GPL");
51
52 static char __initdata version[] = "0.93";
53
54 static inline int
55 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
56 const struct nf_conntrack_tuple *tuple,
57 struct nf_conntrack_l4proto *l4proto)
58 {
59 int ret = 0;
60 struct nlattr *nest_parms;
61
62 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
63 if (!nest_parms)
64 goto nla_put_failure;
65 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
66
67 if (likely(l4proto->tuple_to_nlattr))
68 ret = l4proto->tuple_to_nlattr(skb, tuple);
69
70 nla_nest_end(skb, nest_parms);
71
72 return ret;
73
74 nla_put_failure:
75 return -1;
76 }
77
78 static inline int
79 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
80 const struct nf_conntrack_tuple *tuple,
81 struct nf_conntrack_l3proto *l3proto)
82 {
83 int ret = 0;
84 struct nlattr *nest_parms;
85
86 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
87 if (!nest_parms)
88 goto nla_put_failure;
89
90 if (likely(l3proto->tuple_to_nlattr))
91 ret = l3proto->tuple_to_nlattr(skb, tuple);
92
93 nla_nest_end(skb, nest_parms);
94
95 return ret;
96
97 nla_put_failure:
98 return -1;
99 }
100
101 static int
102 ctnetlink_dump_tuples(struct sk_buff *skb,
103 const struct nf_conntrack_tuple *tuple)
104 {
105 int ret;
106 struct nf_conntrack_l3proto *l3proto;
107 struct nf_conntrack_l4proto *l4proto;
108
109 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
110 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
111
112 if (unlikely(ret < 0))
113 return ret;
114
115 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
116 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
117
118 return ret;
119 }
120
121 static inline int
122 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
123 {
124 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
125 return 0;
126
127 nla_put_failure:
128 return -1;
129 }
130
131 static inline int
132 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
133 {
134 long timeout = (ct->timeout.expires - jiffies) / HZ;
135
136 if (timeout < 0)
137 timeout = 0;
138
139 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
140 return 0;
141
142 nla_put_failure:
143 return -1;
144 }
145
146 static inline int
147 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
148 {
149 struct nf_conntrack_l4proto *l4proto;
150 struct nlattr *nest_proto;
151 int ret;
152
153 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
154 if (!l4proto->to_nlattr)
155 return 0;
156
157 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
158 if (!nest_proto)
159 goto nla_put_failure;
160
161 ret = l4proto->to_nlattr(skb, nest_proto, ct);
162
163 nla_nest_end(skb, nest_proto);
164
165 return ret;
166
167 nla_put_failure:
168 return -1;
169 }
170
171 static inline int
172 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
173 {
174 struct nlattr *nest_helper;
175 const struct nf_conn_help *help = nfct_help(ct);
176 struct nf_conntrack_helper *helper;
177
178 if (!help)
179 return 0;
180
181 helper = rcu_dereference(help->helper);
182 if (!helper)
183 goto out;
184
185 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
186 if (!nest_helper)
187 goto nla_put_failure;
188 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
189
190 if (helper->to_nlattr)
191 helper->to_nlattr(skb, ct);
192
193 nla_nest_end(skb, nest_helper);
194 out:
195 return 0;
196
197 nla_put_failure:
198 return -1;
199 }
200
201 static int
202 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
203 enum ip_conntrack_dir dir)
204 {
205 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
206 struct nlattr *nest_count;
207 const struct nf_conn_counter *acct;
208
209 acct = nf_conn_acct_find(ct);
210 if (!acct)
211 return 0;
212
213 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
214 if (!nest_count)
215 goto nla_put_failure;
216
217 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
218 cpu_to_be64(acct[dir].packets));
219 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
220 cpu_to_be64(acct[dir].bytes));
221
222 nla_nest_end(skb, nest_count);
223
224 return 0;
225
226 nla_put_failure:
227 return -1;
228 }
229
230 #ifdef CONFIG_NF_CONNTRACK_MARK
231 static inline int
232 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
233 {
234 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
235 return 0;
236
237 nla_put_failure:
238 return -1;
239 }
240 #else
241 #define ctnetlink_dump_mark(a, b) (0)
242 #endif
243
244 #ifdef CONFIG_NF_CONNTRACK_SECMARK
245 static inline int
246 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
247 {
248 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
249 return 0;
250
251 nla_put_failure:
252 return -1;
253 }
254 #else
255 #define ctnetlink_dump_secmark(a, b) (0)
256 #endif
257
258 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
259
260 static inline int
261 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
262 {
263 struct nlattr *nest_parms;
264
265 if (!(ct->status & IPS_EXPECTED))
266 return 0;
267
268 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
269 if (!nest_parms)
270 goto nla_put_failure;
271 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
272 goto nla_put_failure;
273 nla_nest_end(skb, nest_parms);
274
275 return 0;
276
277 nla_put_failure:
278 return -1;
279 }
280
281 #ifdef CONFIG_NF_NAT_NEEDED
282 static int
283 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
284 {
285 struct nlattr *nest_parms;
286
287 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
288 if (!nest_parms)
289 goto nla_put_failure;
290
291 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
292 htonl(natseq->correction_pos));
293 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
294 htonl(natseq->offset_before));
295 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
296 htonl(natseq->offset_after));
297
298 nla_nest_end(skb, nest_parms);
299
300 return 0;
301
302 nla_put_failure:
303 return -1;
304 }
305
306 static inline int
307 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
308 {
309 struct nf_nat_seq *natseq;
310 struct nf_conn_nat *nat = nfct_nat(ct);
311
312 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
313 return 0;
314
315 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
316 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
317 return -1;
318
319 natseq = &nat->seq[IP_CT_DIR_REPLY];
320 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
321 return -1;
322
323 return 0;
324 }
325 #else
326 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
327 #endif
328
329 static inline int
330 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
331 {
332 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
333 return 0;
334
335 nla_put_failure:
336 return -1;
337 }
338
339 static inline int
340 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
341 {
342 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
343 return 0;
344
345 nla_put_failure:
346 return -1;
347 }
348
349 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
350
351 static int
352 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
353 int event, int nowait,
354 const struct nf_conn *ct)
355 {
356 struct nlmsghdr *nlh;
357 struct nfgenmsg *nfmsg;
358 struct nlattr *nest_parms;
359 unsigned char *b = skb_tail_pointer(skb);
360
361 event |= NFNL_SUBSYS_CTNETLINK << 8;
362 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
363 nfmsg = NLMSG_DATA(nlh);
364
365 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
366 nfmsg->nfgen_family = nf_ct_l3num(ct);
367 nfmsg->version = NFNETLINK_V0;
368 nfmsg->res_id = 0;
369
370 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
371 if (!nest_parms)
372 goto nla_put_failure;
373 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
374 goto nla_put_failure;
375 nla_nest_end(skb, nest_parms);
376
377 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
378 if (!nest_parms)
379 goto nla_put_failure;
380 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
381 goto nla_put_failure;
382 nla_nest_end(skb, nest_parms);
383
384 if (ctnetlink_dump_status(skb, ct) < 0 ||
385 ctnetlink_dump_timeout(skb, ct) < 0 ||
386 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
387 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
388 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
389 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
390 ctnetlink_dump_mark(skb, ct) < 0 ||
391 ctnetlink_dump_secmark(skb, ct) < 0 ||
392 ctnetlink_dump_id(skb, ct) < 0 ||
393 ctnetlink_dump_use(skb, ct) < 0 ||
394 ctnetlink_dump_master(skb, ct) < 0 ||
395 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
396 goto nla_put_failure;
397
398 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
399 return skb->len;
400
401 nlmsg_failure:
402 nla_put_failure:
403 nlmsg_trim(skb, b);
404 return -1;
405 }
406
407 #ifdef CONFIG_NF_CONNTRACK_EVENTS
408 /*
409 * The general structure of a ctnetlink event is
410 *
411 * CTA_TUPLE_ORIG
412 * <l3/l4-proto-attributes>
413 * CTA_TUPLE_REPLY
414 * <l3/l4-proto-attributes>
415 * CTA_ID
416 * ...
417 * CTA_PROTOINFO
418 * <l4-proto-attributes>
419 * CTA_TUPLE_MASTER
420 * <l3/l4-proto-attributes>
421 *
422 * Therefore the formular is
423 *
424 * size = sizeof(headers) + sizeof(generic_nlas) + 3 * sizeof(tuple_nlas)
425 * + sizeof(protoinfo_nlas)
426 */
427 static struct sk_buff *
428 ctnetlink_alloc_skb(const struct nf_conntrack_tuple *tuple, gfp_t gfp)
429 {
430 struct nf_conntrack_l3proto *l3proto;
431 struct nf_conntrack_l4proto *l4proto;
432 int len;
433
434 #define NLA_TYPE_SIZE(type) nla_total_size(sizeof(type))
435
436 /* proto independant part */
437 len = NLMSG_SPACE(sizeof(struct nfgenmsg))
438 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
439 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
440 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
441 + 3 * NLA_TYPE_SIZE(u_int8_t) /* CTA_PROTO_NUM */
442 + NLA_TYPE_SIZE(u_int32_t) /* CTA_ID */
443 + NLA_TYPE_SIZE(u_int32_t) /* CTA_STATUS */
444 #ifdef CONFIG_NF_CT_ACCT
445 + 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
446 + 2 * NLA_TYPE_SIZE(uint64_t) /* CTA_COUNTERS_PACKETS */
447 + 2 * NLA_TYPE_SIZE(uint64_t) /* CTA_COUNTERS_BYTES */
448 #endif
449 + NLA_TYPE_SIZE(u_int32_t) /* CTA_TIMEOUT */
450 + nla_total_size(0) /* CTA_PROTOINFO */
451 + nla_total_size(0) /* CTA_HELP */
452 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
453 #ifdef CONFIG_NF_CONNTRACK_SECMARK
454 + NLA_TYPE_SIZE(u_int32_t) /* CTA_SECMARK */
455 #endif
456 #ifdef CONFIG_NF_NAT_NEEDED
457 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
458 + 2 * NLA_TYPE_SIZE(u_int32_t) /* CTA_NAT_SEQ_CORRECTION_POS */
459 + 2 * NLA_TYPE_SIZE(u_int32_t) /* CTA_NAT_SEQ_CORRECTION_BEFORE */
460 + 2 * NLA_TYPE_SIZE(u_int32_t) /* CTA_NAT_SEQ_CORRECTION_AFTER */
461 #endif
462 #ifdef CONFIG_NF_CONNTRACK_MARK
463 + NLA_TYPE_SIZE(u_int32_t) /* CTA_MARK */
464 #endif
465 ;
466
467 #undef NLA_TYPE_SIZE
468
469 rcu_read_lock();
470 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
471 len += l3proto->nla_size;
472
473 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
474 len += l4proto->nla_size;
475 rcu_read_unlock();
476
477 return alloc_skb(len, gfp);
478 }
479
480 static int ctnetlink_conntrack_event(struct notifier_block *this,
481 unsigned long events, void *ptr)
482 {
483 struct nlmsghdr *nlh;
484 struct nfgenmsg *nfmsg;
485 struct nlattr *nest_parms;
486 struct nf_ct_event *item = (struct nf_ct_event *)ptr;
487 struct nf_conn *ct = item->ct;
488 struct sk_buff *skb;
489 unsigned int type;
490 sk_buff_data_t b;
491 unsigned int flags = 0, group;
492
493 /* ignore our fake conntrack entry */
494 if (ct == &nf_conntrack_untracked)
495 return NOTIFY_DONE;
496
497 if (events & IPCT_DESTROY) {
498 type = IPCTNL_MSG_CT_DELETE;
499 group = NFNLGRP_CONNTRACK_DESTROY;
500 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
501 type = IPCTNL_MSG_CT_NEW;
502 flags = NLM_F_CREATE|NLM_F_EXCL;
503 group = NFNLGRP_CONNTRACK_NEW;
504 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
505 type = IPCTNL_MSG_CT_NEW;
506 group = NFNLGRP_CONNTRACK_UPDATE;
507 } else
508 return NOTIFY_DONE;
509
510 if (!item->report && !nfnetlink_has_listeners(group))
511 return NOTIFY_DONE;
512
513 skb = ctnetlink_alloc_skb(tuple(ct, IP_CT_DIR_ORIGINAL), GFP_ATOMIC);
514 if (!skb)
515 goto errout;
516
517 b = skb->tail;
518
519 type |= NFNL_SUBSYS_CTNETLINK << 8;
520 nlh = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
521 nfmsg = NLMSG_DATA(nlh);
522
523 nlh->nlmsg_flags = flags;
524 nfmsg->nfgen_family = nf_ct_l3num(ct);
525 nfmsg->version = NFNETLINK_V0;
526 nfmsg->res_id = 0;
527
528 rcu_read_lock();
529 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
530 if (!nest_parms)
531 goto nla_put_failure;
532 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
533 goto nla_put_failure;
534 nla_nest_end(skb, nest_parms);
535
536 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
537 if (!nest_parms)
538 goto nla_put_failure;
539 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
540 goto nla_put_failure;
541 nla_nest_end(skb, nest_parms);
542
543 if (ctnetlink_dump_id(skb, ct) < 0)
544 goto nla_put_failure;
545
546 if (ctnetlink_dump_status(skb, ct) < 0)
547 goto nla_put_failure;
548
549 if (events & IPCT_DESTROY) {
550 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
551 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
552 goto nla_put_failure;
553 } else {
554 if (ctnetlink_dump_timeout(skb, ct) < 0)
555 goto nla_put_failure;
556
557 if (events & IPCT_PROTOINFO
558 && ctnetlink_dump_protoinfo(skb, ct) < 0)
559 goto nla_put_failure;
560
561 if ((events & IPCT_HELPER || nfct_help(ct))
562 && ctnetlink_dump_helpinfo(skb, ct) < 0)
563 goto nla_put_failure;
564
565 #ifdef CONFIG_NF_CONNTRACK_SECMARK
566 if ((events & IPCT_SECMARK || ct->secmark)
567 && ctnetlink_dump_secmark(skb, ct) < 0)
568 goto nla_put_failure;
569 #endif
570
571 if (events & IPCT_RELATED &&
572 ctnetlink_dump_master(skb, ct) < 0)
573 goto nla_put_failure;
574
575 if (events & IPCT_NATSEQADJ &&
576 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
577 goto nla_put_failure;
578 }
579
580 #ifdef CONFIG_NF_CONNTRACK_MARK
581 if ((events & IPCT_MARK || ct->mark)
582 && ctnetlink_dump_mark(skb, ct) < 0)
583 goto nla_put_failure;
584 #endif
585 rcu_read_unlock();
586
587 nlh->nlmsg_len = skb->tail - b;
588 nfnetlink_send(skb, item->pid, group, item->report);
589 return NOTIFY_DONE;
590
591 nla_put_failure:
592 rcu_read_unlock();
593 nlmsg_failure:
594 kfree_skb(skb);
595 errout:
596 nfnetlink_set_err(0, group, -ENOBUFS);
597 return NOTIFY_DONE;
598 }
599 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
600
601 static int ctnetlink_done(struct netlink_callback *cb)
602 {
603 if (cb->args[1])
604 nf_ct_put((struct nf_conn *)cb->args[1]);
605 return 0;
606 }
607
608 static int
609 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
610 {
611 struct nf_conn *ct, *last;
612 struct nf_conntrack_tuple_hash *h;
613 struct hlist_nulls_node *n;
614 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
615 u_int8_t l3proto = nfmsg->nfgen_family;
616
617 rcu_read_lock();
618 last = (struct nf_conn *)cb->args[1];
619 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
620 restart:
621 hlist_nulls_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
622 hnnode) {
623 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
624 continue;
625 ct = nf_ct_tuplehash_to_ctrack(h);
626 if (!atomic_inc_not_zero(&ct->ct_general.use))
627 continue;
628 /* Dump entries of a given L3 protocol number.
629 * If it is not specified, ie. l3proto == 0,
630 * then dump everything. */
631 if (l3proto && nf_ct_l3num(ct) != l3proto)
632 goto releasect;
633 if (cb->args[1]) {
634 if (ct != last)
635 goto releasect;
636 cb->args[1] = 0;
637 }
638 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
639 cb->nlh->nlmsg_seq,
640 IPCTNL_MSG_CT_NEW,
641 1, ct) < 0) {
642 cb->args[1] = (unsigned long)ct;
643 goto out;
644 }
645
646 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
647 IPCTNL_MSG_CT_GET_CTRZERO) {
648 struct nf_conn_counter *acct;
649
650 acct = nf_conn_acct_find(ct);
651 if (acct)
652 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
653 }
654 releasect:
655 nf_ct_put(ct);
656 }
657 if (cb->args[1]) {
658 cb->args[1] = 0;
659 goto restart;
660 }
661 }
662 out:
663 rcu_read_unlock();
664 if (last)
665 nf_ct_put(last);
666
667 return skb->len;
668 }
669
670 static inline int
671 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
672 {
673 struct nlattr *tb[CTA_IP_MAX+1];
674 struct nf_conntrack_l3proto *l3proto;
675 int ret = 0;
676
677 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
678
679 rcu_read_lock();
680 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
681
682 if (likely(l3proto->nlattr_to_tuple)) {
683 ret = nla_validate_nested(attr, CTA_IP_MAX,
684 l3proto->nla_policy);
685 if (ret == 0)
686 ret = l3proto->nlattr_to_tuple(tb, tuple);
687 }
688
689 rcu_read_unlock();
690
691 return ret;
692 }
693
694 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
695 [CTA_PROTO_NUM] = { .type = NLA_U8 },
696 };
697
698 static inline int
699 ctnetlink_parse_tuple_proto(struct nlattr *attr,
700 struct nf_conntrack_tuple *tuple)
701 {
702 struct nlattr *tb[CTA_PROTO_MAX+1];
703 struct nf_conntrack_l4proto *l4proto;
704 int ret = 0;
705
706 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
707 if (ret < 0)
708 return ret;
709
710 if (!tb[CTA_PROTO_NUM])
711 return -EINVAL;
712 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
713
714 rcu_read_lock();
715 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
716
717 if (likely(l4proto->nlattr_to_tuple)) {
718 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
719 l4proto->nla_policy);
720 if (ret == 0)
721 ret = l4proto->nlattr_to_tuple(tb, tuple);
722 }
723
724 rcu_read_unlock();
725
726 return ret;
727 }
728
729 static int
730 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
731 enum ctattr_tuple type, u_int8_t l3num)
732 {
733 struct nlattr *tb[CTA_TUPLE_MAX+1];
734 int err;
735
736 memset(tuple, 0, sizeof(*tuple));
737
738 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
739
740 if (!tb[CTA_TUPLE_IP])
741 return -EINVAL;
742
743 tuple->src.l3num = l3num;
744
745 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
746 if (err < 0)
747 return err;
748
749 if (!tb[CTA_TUPLE_PROTO])
750 return -EINVAL;
751
752 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
753 if (err < 0)
754 return err;
755
756 /* orig and expect tuples get DIR_ORIGINAL */
757 if (type == CTA_TUPLE_REPLY)
758 tuple->dst.dir = IP_CT_DIR_REPLY;
759 else
760 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
761
762 return 0;
763 }
764
765 static inline int
766 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
767 {
768 struct nlattr *tb[CTA_HELP_MAX+1];
769
770 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
771
772 if (!tb[CTA_HELP_NAME])
773 return -EINVAL;
774
775 *helper_name = nla_data(tb[CTA_HELP_NAME]);
776
777 return 0;
778 }
779
780 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
781 [CTA_STATUS] = { .type = NLA_U32 },
782 [CTA_TIMEOUT] = { .type = NLA_U32 },
783 [CTA_MARK] = { .type = NLA_U32 },
784 [CTA_USE] = { .type = NLA_U32 },
785 [CTA_ID] = { .type = NLA_U32 },
786 };
787
788 static int
789 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
790 struct nlmsghdr *nlh, struct nlattr *cda[])
791 {
792 struct nf_conntrack_tuple_hash *h;
793 struct nf_conntrack_tuple tuple;
794 struct nf_conn *ct;
795 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
796 u_int8_t u3 = nfmsg->nfgen_family;
797 int err = 0;
798
799 if (cda[CTA_TUPLE_ORIG])
800 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
801 else if (cda[CTA_TUPLE_REPLY])
802 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
803 else {
804 /* Flush the whole table */
805 nf_conntrack_flush(&init_net,
806 NETLINK_CB(skb).pid,
807 nlmsg_report(nlh));
808 return 0;
809 }
810
811 if (err < 0)
812 return err;
813
814 h = nf_conntrack_find_get(&init_net, &tuple);
815 if (!h)
816 return -ENOENT;
817
818 ct = nf_ct_tuplehash_to_ctrack(h);
819
820 if (cda[CTA_ID]) {
821 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
822 if (id != (u32)(unsigned long)ct) {
823 nf_ct_put(ct);
824 return -ENOENT;
825 }
826 }
827
828 nf_conntrack_event_report(IPCT_DESTROY,
829 ct,
830 NETLINK_CB(skb).pid,
831 nlmsg_report(nlh));
832
833 /* death_by_timeout would report the event again */
834 set_bit(IPS_DYING_BIT, &ct->status);
835
836 nf_ct_kill(ct);
837 nf_ct_put(ct);
838
839 return 0;
840 }
841
842 static int
843 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
844 struct nlmsghdr *nlh, struct nlattr *cda[])
845 {
846 struct nf_conntrack_tuple_hash *h;
847 struct nf_conntrack_tuple tuple;
848 struct nf_conn *ct;
849 struct sk_buff *skb2 = NULL;
850 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
851 u_int8_t u3 = nfmsg->nfgen_family;
852 int err = 0;
853
854 if (nlh->nlmsg_flags & NLM_F_DUMP)
855 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
856 ctnetlink_done);
857
858 if (cda[CTA_TUPLE_ORIG])
859 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
860 else if (cda[CTA_TUPLE_REPLY])
861 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
862 else
863 return -EINVAL;
864
865 if (err < 0)
866 return err;
867
868 h = nf_conntrack_find_get(&init_net, &tuple);
869 if (!h)
870 return -ENOENT;
871
872 ct = nf_ct_tuplehash_to_ctrack(h);
873
874 err = -ENOMEM;
875 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
876 if (!skb2) {
877 nf_ct_put(ct);
878 return -ENOMEM;
879 }
880
881 rcu_read_lock();
882 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
883 IPCTNL_MSG_CT_NEW, 1, ct);
884 rcu_read_unlock();
885 nf_ct_put(ct);
886 if (err <= 0)
887 goto free;
888
889 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
890 if (err < 0)
891 goto out;
892
893 return 0;
894
895 free:
896 kfree_skb(skb2);
897 out:
898 return err;
899 }
900
901 #ifdef CONFIG_NF_NAT_NEEDED
902 static int
903 ctnetlink_parse_nat_setup(struct nf_conn *ct,
904 enum nf_nat_manip_type manip,
905 struct nlattr *attr)
906 {
907 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
908
909 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
910 if (!parse_nat_setup) {
911 #ifdef CONFIG_MODULES
912 rcu_read_unlock();
913 spin_unlock_bh(&nf_conntrack_lock);
914 nfnl_unlock();
915 if (request_module("nf-nat-ipv4") < 0) {
916 nfnl_lock();
917 spin_lock_bh(&nf_conntrack_lock);
918 rcu_read_lock();
919 return -EOPNOTSUPP;
920 }
921 nfnl_lock();
922 spin_lock_bh(&nf_conntrack_lock);
923 rcu_read_lock();
924 if (nfnetlink_parse_nat_setup_hook)
925 return -EAGAIN;
926 #endif
927 return -EOPNOTSUPP;
928 }
929
930 return parse_nat_setup(ct, manip, attr);
931 }
932 #endif
933
934 static int
935 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
936 {
937 unsigned long d;
938 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
939 d = ct->status ^ status;
940
941 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
942 /* unchangeable */
943 return -EBUSY;
944
945 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
946 /* SEEN_REPLY bit can only be set */
947 return -EBUSY;
948
949 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
950 /* ASSURED bit can only be set */
951 return -EBUSY;
952
953 /* Be careful here, modifying NAT bits can screw up things,
954 * so don't let users modify them directly if they don't pass
955 * nf_nat_range. */
956 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
957 return 0;
958 }
959
960 static int
961 ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[])
962 {
963 #ifdef CONFIG_NF_NAT_NEEDED
964 int ret;
965
966 if (cda[CTA_NAT_DST]) {
967 ret = ctnetlink_parse_nat_setup(ct,
968 IP_NAT_MANIP_DST,
969 cda[CTA_NAT_DST]);
970 if (ret < 0)
971 return ret;
972 }
973 if (cda[CTA_NAT_SRC]) {
974 ret = ctnetlink_parse_nat_setup(ct,
975 IP_NAT_MANIP_SRC,
976 cda[CTA_NAT_SRC]);
977 if (ret < 0)
978 return ret;
979 }
980 return 0;
981 #else
982 return -EOPNOTSUPP;
983 #endif
984 }
985
986 static inline int
987 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
988 {
989 struct nf_conntrack_helper *helper;
990 struct nf_conn_help *help = nfct_help(ct);
991 char *helpname = NULL;
992 int err;
993
994 /* don't change helper of sibling connections */
995 if (ct->master)
996 return -EBUSY;
997
998 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
999 if (err < 0)
1000 return err;
1001
1002 if (!strcmp(helpname, "")) {
1003 if (help && help->helper) {
1004 /* we had a helper before ... */
1005 nf_ct_remove_expectations(ct);
1006 rcu_assign_pointer(help->helper, NULL);
1007 }
1008
1009 return 0;
1010 }
1011
1012 helper = __nf_conntrack_helper_find_byname(helpname);
1013 if (helper == NULL) {
1014 #ifdef CONFIG_MODULES
1015 spin_unlock_bh(&nf_conntrack_lock);
1016
1017 if (request_module("nfct-helper-%s", helpname) < 0) {
1018 spin_lock_bh(&nf_conntrack_lock);
1019 return -EOPNOTSUPP;
1020 }
1021
1022 spin_lock_bh(&nf_conntrack_lock);
1023 helper = __nf_conntrack_helper_find_byname(helpname);
1024 if (helper)
1025 return -EAGAIN;
1026 #endif
1027 return -EOPNOTSUPP;
1028 }
1029
1030 if (help) {
1031 if (help->helper == helper)
1032 return 0;
1033 if (help->helper)
1034 return -EBUSY;
1035 /* need to zero data of old helper */
1036 memset(&help->help, 0, sizeof(help->help));
1037 } else {
1038 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1039 if (help == NULL)
1040 return -ENOMEM;
1041 }
1042
1043 rcu_assign_pointer(help->helper, helper);
1044
1045 return 0;
1046 }
1047
1048 static inline int
1049 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
1050 {
1051 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1052
1053 if (!del_timer(&ct->timeout))
1054 return -ETIME;
1055
1056 ct->timeout.expires = jiffies + timeout * HZ;
1057 add_timer(&ct->timeout);
1058
1059 return 0;
1060 }
1061
1062 static inline int
1063 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1064 {
1065 struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1066 struct nf_conntrack_l4proto *l4proto;
1067 int err = 0;
1068
1069 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1070
1071 rcu_read_lock();
1072 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1073 if (l4proto->from_nlattr)
1074 err = l4proto->from_nlattr(tb, ct);
1075 rcu_read_unlock();
1076
1077 return err;
1078 }
1079
1080 #ifdef CONFIG_NF_NAT_NEEDED
1081 static inline int
1082 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1083 {
1084 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1085
1086 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1087
1088 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1089 return -EINVAL;
1090
1091 natseq->correction_pos =
1092 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1093
1094 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1095 return -EINVAL;
1096
1097 natseq->offset_before =
1098 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1099
1100 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1101 return -EINVAL;
1102
1103 natseq->offset_after =
1104 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1105
1106 return 0;
1107 }
1108
1109 static int
1110 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1111 {
1112 int ret = 0;
1113 struct nf_conn_nat *nat = nfct_nat(ct);
1114
1115 if (!nat)
1116 return 0;
1117
1118 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1119 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1120 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1121 if (ret < 0)
1122 return ret;
1123
1124 ct->status |= IPS_SEQ_ADJUST;
1125 }
1126
1127 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1128 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1129 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1130 if (ret < 0)
1131 return ret;
1132
1133 ct->status |= IPS_SEQ_ADJUST;
1134 }
1135
1136 return 0;
1137 }
1138 #endif
1139
1140 static int
1141 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1142 {
1143 int err;
1144
1145 /* only allow NAT changes and master assignation for new conntracks */
1146 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1147 return -EOPNOTSUPP;
1148
1149 if (cda[CTA_HELP]) {
1150 err = ctnetlink_change_helper(ct, cda);
1151 if (err < 0)
1152 return err;
1153 }
1154
1155 if (cda[CTA_TIMEOUT]) {
1156 err = ctnetlink_change_timeout(ct, cda);
1157 if (err < 0)
1158 return err;
1159 }
1160
1161 if (cda[CTA_STATUS]) {
1162 err = ctnetlink_change_status(ct, cda);
1163 if (err < 0)
1164 return err;
1165 }
1166
1167 if (cda[CTA_PROTOINFO]) {
1168 err = ctnetlink_change_protoinfo(ct, cda);
1169 if (err < 0)
1170 return err;
1171 }
1172
1173 #if defined(CONFIG_NF_CONNTRACK_MARK)
1174 if (cda[CTA_MARK])
1175 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1176 #endif
1177
1178 #ifdef CONFIG_NF_NAT_NEEDED
1179 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1180 err = ctnetlink_change_nat_seq_adj(ct, cda);
1181 if (err < 0)
1182 return err;
1183 }
1184 #endif
1185
1186 return 0;
1187 }
1188
1189 static struct nf_conn *
1190 ctnetlink_create_conntrack(struct nlattr *cda[],
1191 struct nf_conntrack_tuple *otuple,
1192 struct nf_conntrack_tuple *rtuple,
1193 u8 u3)
1194 {
1195 struct nf_conn *ct;
1196 int err = -EINVAL;
1197 struct nf_conntrack_helper *helper;
1198
1199 ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_ATOMIC);
1200 if (IS_ERR(ct))
1201 return ERR_PTR(-ENOMEM);
1202
1203 if (!cda[CTA_TIMEOUT])
1204 goto err1;
1205 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1206
1207 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1208 ct->status |= IPS_CONFIRMED;
1209
1210 rcu_read_lock();
1211 if (cda[CTA_HELP]) {
1212 char *helpname = NULL;
1213
1214 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1215 if (err < 0)
1216 goto err2;
1217
1218 helper = __nf_conntrack_helper_find_byname(helpname);
1219 if (helper == NULL) {
1220 rcu_read_unlock();
1221 #ifdef CONFIG_MODULES
1222 if (request_module("nfct-helper-%s", helpname) < 0) {
1223 err = -EOPNOTSUPP;
1224 goto err1;
1225 }
1226
1227 rcu_read_lock();
1228 helper = __nf_conntrack_helper_find_byname(helpname);
1229 if (helper) {
1230 err = -EAGAIN;
1231 goto err2;
1232 }
1233 rcu_read_unlock();
1234 #endif
1235 err = -EOPNOTSUPP;
1236 goto err1;
1237 } else {
1238 struct nf_conn_help *help;
1239
1240 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1241 if (help == NULL) {
1242 err = -ENOMEM;
1243 goto err2;
1244 }
1245
1246 /* not in hash table yet so not strictly necessary */
1247 rcu_assign_pointer(help->helper, helper);
1248 }
1249 } else {
1250 /* try an implicit helper assignation */
1251 err = __nf_ct_try_assign_helper(ct, GFP_ATOMIC);
1252 if (err < 0)
1253 goto err2;
1254 }
1255
1256 if (cda[CTA_STATUS]) {
1257 err = ctnetlink_change_status(ct, cda);
1258 if (err < 0)
1259 goto err2;
1260 }
1261
1262 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1263 err = ctnetlink_change_nat(ct, cda);
1264 if (err < 0)
1265 goto err2;
1266 }
1267
1268 #ifdef CONFIG_NF_NAT_NEEDED
1269 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1270 err = ctnetlink_change_nat_seq_adj(ct, cda);
1271 if (err < 0)
1272 goto err2;
1273 }
1274 #endif
1275
1276 if (cda[CTA_PROTOINFO]) {
1277 err = ctnetlink_change_protoinfo(ct, cda);
1278 if (err < 0)
1279 goto err2;
1280 }
1281
1282 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1283
1284 #if defined(CONFIG_NF_CONNTRACK_MARK)
1285 if (cda[CTA_MARK])
1286 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1287 #endif
1288
1289 /* setup master conntrack: this is a confirmed expectation */
1290 if (cda[CTA_TUPLE_MASTER]) {
1291 struct nf_conntrack_tuple master;
1292 struct nf_conntrack_tuple_hash *master_h;
1293 struct nf_conn *master_ct;
1294
1295 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1296 if (err < 0)
1297 goto err2;
1298
1299 master_h = nf_conntrack_find_get(&init_net, &master);
1300 if (master_h == NULL) {
1301 err = -ENOENT;
1302 goto err2;
1303 }
1304 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1305 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1306 ct->master = master_ct;
1307 }
1308
1309 add_timer(&ct->timeout);
1310 nf_conntrack_hash_insert(ct);
1311 rcu_read_unlock();
1312
1313 return ct;
1314
1315 err2:
1316 rcu_read_unlock();
1317 err1:
1318 nf_conntrack_free(ct);
1319 return ERR_PTR(err);
1320 }
1321
1322 static int
1323 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1324 struct nlmsghdr *nlh, struct nlattr *cda[])
1325 {
1326 struct nf_conntrack_tuple otuple, rtuple;
1327 struct nf_conntrack_tuple_hash *h = NULL;
1328 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1329 u_int8_t u3 = nfmsg->nfgen_family;
1330 int err = 0;
1331
1332 if (cda[CTA_TUPLE_ORIG]) {
1333 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1334 if (err < 0)
1335 return err;
1336 }
1337
1338 if (cda[CTA_TUPLE_REPLY]) {
1339 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1340 if (err < 0)
1341 return err;
1342 }
1343
1344 spin_lock_bh(&nf_conntrack_lock);
1345 if (cda[CTA_TUPLE_ORIG])
1346 h = __nf_conntrack_find(&init_net, &otuple);
1347 else if (cda[CTA_TUPLE_REPLY])
1348 h = __nf_conntrack_find(&init_net, &rtuple);
1349
1350 if (h == NULL) {
1351 err = -ENOENT;
1352 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1353 struct nf_conn *ct;
1354 enum ip_conntrack_events events;
1355
1356 ct = ctnetlink_create_conntrack(cda, &otuple,
1357 &rtuple, u3);
1358 if (IS_ERR(ct)) {
1359 err = PTR_ERR(ct);
1360 goto out_unlock;
1361 }
1362 err = 0;
1363 nf_conntrack_get(&ct->ct_general);
1364 spin_unlock_bh(&nf_conntrack_lock);
1365 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1366 events = IPCT_RELATED;
1367 else
1368 events = IPCT_NEW;
1369
1370 nf_conntrack_event_report(IPCT_STATUS |
1371 IPCT_HELPER |
1372 IPCT_PROTOINFO |
1373 IPCT_NATSEQADJ |
1374 IPCT_MARK | events,
1375 ct, NETLINK_CB(skb).pid,
1376 nlmsg_report(nlh));
1377 nf_ct_put(ct);
1378 } else
1379 spin_unlock_bh(&nf_conntrack_lock);
1380
1381 return err;
1382 }
1383 /* implicit 'else' */
1384
1385 /* We manipulate the conntrack inside the global conntrack table lock,
1386 * so there's no need to increase the refcount */
1387 err = -EEXIST;
1388 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1389 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1390
1391 err = ctnetlink_change_conntrack(ct, cda);
1392 if (err == 0) {
1393 nf_conntrack_get(&ct->ct_general);
1394 spin_unlock_bh(&nf_conntrack_lock);
1395 nf_conntrack_event_report(IPCT_STATUS |
1396 IPCT_HELPER |
1397 IPCT_PROTOINFO |
1398 IPCT_NATSEQADJ |
1399 IPCT_MARK,
1400 ct, NETLINK_CB(skb).pid,
1401 nlmsg_report(nlh));
1402 nf_ct_put(ct);
1403 } else
1404 spin_unlock_bh(&nf_conntrack_lock);
1405
1406 return err;
1407 }
1408
1409 out_unlock:
1410 spin_unlock_bh(&nf_conntrack_lock);
1411 return err;
1412 }
1413
1414 /***********************************************************************
1415 * EXPECT
1416 ***********************************************************************/
1417
1418 static inline int
1419 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1420 const struct nf_conntrack_tuple *tuple,
1421 enum ctattr_expect type)
1422 {
1423 struct nlattr *nest_parms;
1424
1425 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1426 if (!nest_parms)
1427 goto nla_put_failure;
1428 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1429 goto nla_put_failure;
1430 nla_nest_end(skb, nest_parms);
1431
1432 return 0;
1433
1434 nla_put_failure:
1435 return -1;
1436 }
1437
1438 static inline int
1439 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1440 const struct nf_conntrack_tuple *tuple,
1441 const struct nf_conntrack_tuple_mask *mask)
1442 {
1443 int ret;
1444 struct nf_conntrack_l3proto *l3proto;
1445 struct nf_conntrack_l4proto *l4proto;
1446 struct nf_conntrack_tuple m;
1447 struct nlattr *nest_parms;
1448
1449 memset(&m, 0xFF, sizeof(m));
1450 m.src.u.all = mask->src.u.all;
1451 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1452
1453 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1454 if (!nest_parms)
1455 goto nla_put_failure;
1456
1457 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1458 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1459
1460 if (unlikely(ret < 0))
1461 goto nla_put_failure;
1462
1463 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1464 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1465 if (unlikely(ret < 0))
1466 goto nla_put_failure;
1467
1468 nla_nest_end(skb, nest_parms);
1469
1470 return 0;
1471
1472 nla_put_failure:
1473 return -1;
1474 }
1475
1476 static int
1477 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1478 const struct nf_conntrack_expect *exp)
1479 {
1480 struct nf_conn *master = exp->master;
1481 long timeout = (exp->timeout.expires - jiffies) / HZ;
1482
1483 if (timeout < 0)
1484 timeout = 0;
1485
1486 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1487 goto nla_put_failure;
1488 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1489 goto nla_put_failure;
1490 if (ctnetlink_exp_dump_tuple(skb,
1491 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1492 CTA_EXPECT_MASTER) < 0)
1493 goto nla_put_failure;
1494
1495 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1496 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1497
1498 return 0;
1499
1500 nla_put_failure:
1501 return -1;
1502 }
1503
1504 static int
1505 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1506 int event,
1507 int nowait,
1508 const struct nf_conntrack_expect *exp)
1509 {
1510 struct nlmsghdr *nlh;
1511 struct nfgenmsg *nfmsg;
1512 unsigned char *b = skb_tail_pointer(skb);
1513
1514 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1515 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1516 nfmsg = NLMSG_DATA(nlh);
1517
1518 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1519 nfmsg->nfgen_family = exp->tuple.src.l3num;
1520 nfmsg->version = NFNETLINK_V0;
1521 nfmsg->res_id = 0;
1522
1523 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1524 goto nla_put_failure;
1525
1526 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1527 return skb->len;
1528
1529 nlmsg_failure:
1530 nla_put_failure:
1531 nlmsg_trim(skb, b);
1532 return -1;
1533 }
1534
1535 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1536 static int ctnetlink_expect_event(struct notifier_block *this,
1537 unsigned long events, void *ptr)
1538 {
1539 struct nlmsghdr *nlh;
1540 struct nfgenmsg *nfmsg;
1541 struct nf_exp_event *item = (struct nf_exp_event *)ptr;
1542 struct nf_conntrack_expect *exp = item->exp;
1543 struct sk_buff *skb;
1544 unsigned int type;
1545 sk_buff_data_t b;
1546 int flags = 0;
1547
1548 if (events & IPEXP_NEW) {
1549 type = IPCTNL_MSG_EXP_NEW;
1550 flags = NLM_F_CREATE|NLM_F_EXCL;
1551 } else
1552 return NOTIFY_DONE;
1553
1554 if (!item->report &&
1555 !nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1556 return NOTIFY_DONE;
1557
1558 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1559 if (!skb)
1560 goto errout;
1561
1562 b = skb->tail;
1563
1564 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1565 nlh = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
1566 nfmsg = NLMSG_DATA(nlh);
1567
1568 nlh->nlmsg_flags = flags;
1569 nfmsg->nfgen_family = exp->tuple.src.l3num;
1570 nfmsg->version = NFNETLINK_V0;
1571 nfmsg->res_id = 0;
1572
1573 rcu_read_lock();
1574 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1575 goto nla_put_failure;
1576 rcu_read_unlock();
1577
1578 nlh->nlmsg_len = skb->tail - b;
1579 nfnetlink_send(skb, item->pid, NFNLGRP_CONNTRACK_EXP_NEW, item->report);
1580 return NOTIFY_DONE;
1581
1582 nla_put_failure:
1583 rcu_read_unlock();
1584 nlmsg_failure:
1585 kfree_skb(skb);
1586 errout:
1587 nfnetlink_set_err(0, 0, -ENOBUFS);
1588 return NOTIFY_DONE;
1589 }
1590 #endif
1591 static int ctnetlink_exp_done(struct netlink_callback *cb)
1592 {
1593 if (cb->args[1])
1594 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1595 return 0;
1596 }
1597
1598 static int
1599 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1600 {
1601 struct net *net = &init_net;
1602 struct nf_conntrack_expect *exp, *last;
1603 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1604 struct hlist_node *n;
1605 u_int8_t l3proto = nfmsg->nfgen_family;
1606
1607 rcu_read_lock();
1608 last = (struct nf_conntrack_expect *)cb->args[1];
1609 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1610 restart:
1611 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1612 hnode) {
1613 if (l3proto && exp->tuple.src.l3num != l3proto)
1614 continue;
1615 if (cb->args[1]) {
1616 if (exp != last)
1617 continue;
1618 cb->args[1] = 0;
1619 }
1620 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1621 cb->nlh->nlmsg_seq,
1622 IPCTNL_MSG_EXP_NEW,
1623 1, exp) < 0) {
1624 if (!atomic_inc_not_zero(&exp->use))
1625 continue;
1626 cb->args[1] = (unsigned long)exp;
1627 goto out;
1628 }
1629 }
1630 if (cb->args[1]) {
1631 cb->args[1] = 0;
1632 goto restart;
1633 }
1634 }
1635 out:
1636 rcu_read_unlock();
1637 if (last)
1638 nf_ct_expect_put(last);
1639
1640 return skb->len;
1641 }
1642
1643 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1644 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1645 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1646 };
1647
1648 static int
1649 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1650 struct nlmsghdr *nlh, struct nlattr *cda[])
1651 {
1652 struct nf_conntrack_tuple tuple;
1653 struct nf_conntrack_expect *exp;
1654 struct sk_buff *skb2;
1655 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1656 u_int8_t u3 = nfmsg->nfgen_family;
1657 int err = 0;
1658
1659 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1660 return netlink_dump_start(ctnl, skb, nlh,
1661 ctnetlink_exp_dump_table,
1662 ctnetlink_exp_done);
1663 }
1664
1665 if (cda[CTA_EXPECT_MASTER])
1666 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1667 else
1668 return -EINVAL;
1669
1670 if (err < 0)
1671 return err;
1672
1673 exp = nf_ct_expect_find_get(&init_net, &tuple);
1674 if (!exp)
1675 return -ENOENT;
1676
1677 if (cda[CTA_EXPECT_ID]) {
1678 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1679 if (ntohl(id) != (u32)(unsigned long)exp) {
1680 nf_ct_expect_put(exp);
1681 return -ENOENT;
1682 }
1683 }
1684
1685 err = -ENOMEM;
1686 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1687 if (!skb2)
1688 goto out;
1689
1690 rcu_read_lock();
1691 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1692 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1693 1, exp);
1694 rcu_read_unlock();
1695 if (err <= 0)
1696 goto free;
1697
1698 nf_ct_expect_put(exp);
1699
1700 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1701
1702 free:
1703 kfree_skb(skb2);
1704 out:
1705 nf_ct_expect_put(exp);
1706 return err;
1707 }
1708
1709 static int
1710 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1711 struct nlmsghdr *nlh, struct nlattr *cda[])
1712 {
1713 struct nf_conntrack_expect *exp;
1714 struct nf_conntrack_tuple tuple;
1715 struct nf_conntrack_helper *h;
1716 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1717 struct hlist_node *n, *next;
1718 u_int8_t u3 = nfmsg->nfgen_family;
1719 unsigned int i;
1720 int err;
1721
1722 if (cda[CTA_EXPECT_TUPLE]) {
1723 /* delete a single expect by tuple */
1724 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1725 if (err < 0)
1726 return err;
1727
1728 /* bump usage count to 2 */
1729 exp = nf_ct_expect_find_get(&init_net, &tuple);
1730 if (!exp)
1731 return -ENOENT;
1732
1733 if (cda[CTA_EXPECT_ID]) {
1734 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1735 if (ntohl(id) != (u32)(unsigned long)exp) {
1736 nf_ct_expect_put(exp);
1737 return -ENOENT;
1738 }
1739 }
1740
1741 /* after list removal, usage count == 1 */
1742 nf_ct_unexpect_related(exp);
1743 /* have to put what we 'get' above.
1744 * after this line usage count == 0 */
1745 nf_ct_expect_put(exp);
1746 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1747 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1748 struct nf_conn_help *m_help;
1749
1750 /* delete all expectations for this helper */
1751 spin_lock_bh(&nf_conntrack_lock);
1752 h = __nf_conntrack_helper_find_byname(name);
1753 if (!h) {
1754 spin_unlock_bh(&nf_conntrack_lock);
1755 return -EOPNOTSUPP;
1756 }
1757 for (i = 0; i < nf_ct_expect_hsize; i++) {
1758 hlist_for_each_entry_safe(exp, n, next,
1759 &init_net.ct.expect_hash[i],
1760 hnode) {
1761 m_help = nfct_help(exp->master);
1762 if (m_help->helper == h
1763 && del_timer(&exp->timeout)) {
1764 nf_ct_unlink_expect(exp);
1765 nf_ct_expect_put(exp);
1766 }
1767 }
1768 }
1769 spin_unlock_bh(&nf_conntrack_lock);
1770 } else {
1771 /* This basically means we have to flush everything*/
1772 spin_lock_bh(&nf_conntrack_lock);
1773 for (i = 0; i < nf_ct_expect_hsize; i++) {
1774 hlist_for_each_entry_safe(exp, n, next,
1775 &init_net.ct.expect_hash[i],
1776 hnode) {
1777 if (del_timer(&exp->timeout)) {
1778 nf_ct_unlink_expect(exp);
1779 nf_ct_expect_put(exp);
1780 }
1781 }
1782 }
1783 spin_unlock_bh(&nf_conntrack_lock);
1784 }
1785
1786 return 0;
1787 }
1788 static int
1789 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1790 {
1791 return -EOPNOTSUPP;
1792 }
1793
1794 static int
1795 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3, u32 pid, int report)
1796 {
1797 struct nf_conntrack_tuple tuple, mask, master_tuple;
1798 struct nf_conntrack_tuple_hash *h = NULL;
1799 struct nf_conntrack_expect *exp;
1800 struct nf_conn *ct;
1801 struct nf_conn_help *help;
1802 int err = 0;
1803
1804 /* caller guarantees that those three CTA_EXPECT_* exist */
1805 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1806 if (err < 0)
1807 return err;
1808 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1809 if (err < 0)
1810 return err;
1811 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1812 if (err < 0)
1813 return err;
1814
1815 /* Look for master conntrack of this expectation */
1816 h = nf_conntrack_find_get(&init_net, &master_tuple);
1817 if (!h)
1818 return -ENOENT;
1819 ct = nf_ct_tuplehash_to_ctrack(h);
1820 help = nfct_help(ct);
1821
1822 if (!help || !help->helper) {
1823 /* such conntrack hasn't got any helper, abort */
1824 err = -EOPNOTSUPP;
1825 goto out;
1826 }
1827
1828 exp = nf_ct_expect_alloc(ct);
1829 if (!exp) {
1830 err = -ENOMEM;
1831 goto out;
1832 }
1833
1834 exp->class = 0;
1835 exp->expectfn = NULL;
1836 exp->flags = 0;
1837 exp->master = ct;
1838 exp->helper = NULL;
1839 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1840 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1841 exp->mask.src.u.all = mask.src.u.all;
1842
1843 err = nf_ct_expect_related_report(exp, pid, report);
1844 nf_ct_expect_put(exp);
1845
1846 out:
1847 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1848 return err;
1849 }
1850
1851 static int
1852 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1853 struct nlmsghdr *nlh, struct nlattr *cda[])
1854 {
1855 struct nf_conntrack_tuple tuple;
1856 struct nf_conntrack_expect *exp;
1857 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1858 u_int8_t u3 = nfmsg->nfgen_family;
1859 int err = 0;
1860
1861 if (!cda[CTA_EXPECT_TUPLE]
1862 || !cda[CTA_EXPECT_MASK]
1863 || !cda[CTA_EXPECT_MASTER])
1864 return -EINVAL;
1865
1866 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1867 if (err < 0)
1868 return err;
1869
1870 spin_lock_bh(&nf_conntrack_lock);
1871 exp = __nf_ct_expect_find(&init_net, &tuple);
1872
1873 if (!exp) {
1874 spin_unlock_bh(&nf_conntrack_lock);
1875 err = -ENOENT;
1876 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1877 err = ctnetlink_create_expect(cda,
1878 u3,
1879 NETLINK_CB(skb).pid,
1880 nlmsg_report(nlh));
1881 }
1882 return err;
1883 }
1884
1885 err = -EEXIST;
1886 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1887 err = ctnetlink_change_expect(exp, cda);
1888 spin_unlock_bh(&nf_conntrack_lock);
1889
1890 return err;
1891 }
1892
1893 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1894 static struct notifier_block ctnl_notifier = {
1895 .notifier_call = ctnetlink_conntrack_event,
1896 };
1897
1898 static struct notifier_block ctnl_notifier_exp = {
1899 .notifier_call = ctnetlink_expect_event,
1900 };
1901 #endif
1902
1903 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1904 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1905 .attr_count = CTA_MAX,
1906 .policy = ct_nla_policy },
1907 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1908 .attr_count = CTA_MAX,
1909 .policy = ct_nla_policy },
1910 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1911 .attr_count = CTA_MAX,
1912 .policy = ct_nla_policy },
1913 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1914 .attr_count = CTA_MAX,
1915 .policy = ct_nla_policy },
1916 };
1917
1918 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1919 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1920 .attr_count = CTA_EXPECT_MAX,
1921 .policy = exp_nla_policy },
1922 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1923 .attr_count = CTA_EXPECT_MAX,
1924 .policy = exp_nla_policy },
1925 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1926 .attr_count = CTA_EXPECT_MAX,
1927 .policy = exp_nla_policy },
1928 };
1929
1930 static const struct nfnetlink_subsystem ctnl_subsys = {
1931 .name = "conntrack",
1932 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1933 .cb_count = IPCTNL_MSG_MAX,
1934 .cb = ctnl_cb,
1935 };
1936
1937 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1938 .name = "conntrack_expect",
1939 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1940 .cb_count = IPCTNL_MSG_EXP_MAX,
1941 .cb = ctnl_exp_cb,
1942 };
1943
1944 MODULE_ALIAS("ip_conntrack_netlink");
1945 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1946 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1947
1948 static int __init ctnetlink_init(void)
1949 {
1950 int ret;
1951
1952 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1953 ret = nfnetlink_subsys_register(&ctnl_subsys);
1954 if (ret < 0) {
1955 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1956 goto err_out;
1957 }
1958
1959 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1960 if (ret < 0) {
1961 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1962 goto err_unreg_subsys;
1963 }
1964
1965 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1966 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1967 if (ret < 0) {
1968 printk("ctnetlink_init: cannot register notifier.\n");
1969 goto err_unreg_exp_subsys;
1970 }
1971
1972 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1973 if (ret < 0) {
1974 printk("ctnetlink_init: cannot expect register notifier.\n");
1975 goto err_unreg_notifier;
1976 }
1977 #endif
1978
1979 return 0;
1980
1981 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1982 err_unreg_notifier:
1983 nf_conntrack_unregister_notifier(&ctnl_notifier);
1984 err_unreg_exp_subsys:
1985 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1986 #endif
1987 err_unreg_subsys:
1988 nfnetlink_subsys_unregister(&ctnl_subsys);
1989 err_out:
1990 return ret;
1991 }
1992
1993 static void __exit ctnetlink_exit(void)
1994 {
1995 printk("ctnetlink: unregistering from nfnetlink.\n");
1996
1997 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1998 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1999 nf_conntrack_unregister_notifier(&ctnl_notifier);
2000 #endif
2001
2002 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2003 nfnetlink_subsys_unregister(&ctnl_subsys);
2004 return;
2005 }
2006
2007 module_init(ctnetlink_init);
2008 module_exit(ctnetlink_exit);
Linux for Ginger Game Console