?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
netfilter: ctnetlink: compute message size properly
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / netfilter / nf_conntrack_netlink.c
blob9a0c0d99dbfd3eb77017f5888bd33a231d28c537
1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/skbuff.h>
26 #include <linux/errno.h>
27 #include <linux/netlink.h>
28 #include <linux/spinlock.h>
29 #include <linux/interrupt.h>
30
31 #include <linux/netfilter.h>
32 #include <net/netlink.h>
33 #include <net/sock.h>
34 #include <net/netfilter/nf_conntrack.h>
35 #include <net/netfilter/nf_conntrack_core.h>
36 #include <net/netfilter/nf_conntrack_expect.h>
37 #include <net/netfilter/nf_conntrack_helper.h>
38 #include <net/netfilter/nf_conntrack_l3proto.h>
39 #include <net/netfilter/nf_conntrack_l4proto.h>
40 #include <net/netfilter/nf_conntrack_tuple.h>
41 #include <net/netfilter/nf_conntrack_acct.h>
42 #include <net/netfilter/nf_conntrack_zones.h>
43 #ifdef CONFIG_NF_NAT_NEEDED
44 #include <net/netfilter/nf_nat_core.h>
45 #include <net/netfilter/nf_nat_protocol.h>
46 #endif
47
48 #include <linux/netfilter/nfnetlink.h>
49 #include <linux/netfilter/nfnetlink_conntrack.h>
50
51 MODULE_LICENSE("GPL");
52
53 static char __initdata version[] = "0.93";
54
55 static inline int
56 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
57 const struct nf_conntrack_tuple *tuple,
58 struct nf_conntrack_l4proto *l4proto)
59 {
60 int ret = 0;
61 struct nlattr *nest_parms;
62
63 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
64 if (!nest_parms)
65 goto nla_put_failure;
66 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
67
68 if (likely(l4proto->tuple_to_nlattr))
69 ret = l4proto->tuple_to_nlattr(skb, tuple);
70
71 nla_nest_end(skb, nest_parms);
72
73 return ret;
74
75 nla_put_failure:
76 return -1;
77 }
78
79 static inline int
80 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
81 const struct nf_conntrack_tuple *tuple,
82 struct nf_conntrack_l3proto *l3proto)
83 {
84 int ret = 0;
85 struct nlattr *nest_parms;
86
87 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
88 if (!nest_parms)
89 goto nla_put_failure;
90
91 if (likely(l3proto->tuple_to_nlattr))
92 ret = l3proto->tuple_to_nlattr(skb, tuple);
93
94 nla_nest_end(skb, nest_parms);
95
96 return ret;
97
98 nla_put_failure:
99 return -1;
100 }
101
102 static int
103 ctnetlink_dump_tuples(struct sk_buff *skb,
104 const struct nf_conntrack_tuple *tuple)
105 {
106 int ret;
107 struct nf_conntrack_l3proto *l3proto;
108 struct nf_conntrack_l4proto *l4proto;
109
110 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
111 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
112
113 if (unlikely(ret < 0))
114 return ret;
115
116 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
117 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
118
119 return ret;
120 }
121
122 static inline int
123 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
124 {
125 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
126 return 0;
127
128 nla_put_failure:
129 return -1;
130 }
131
132 static inline int
133 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
134 {
135 long timeout = (ct->timeout.expires - jiffies) / HZ;
136
137 if (timeout < 0)
138 timeout = 0;
139
140 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
141 return 0;
142
143 nla_put_failure:
144 return -1;
145 }
146
147 static inline int
148 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
149 {
150 struct nf_conntrack_l4proto *l4proto;
151 struct nlattr *nest_proto;
152 int ret;
153
154 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
155 if (!l4proto->to_nlattr)
156 return 0;
157
158 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
159 if (!nest_proto)
160 goto nla_put_failure;
161
162 ret = l4proto->to_nlattr(skb, nest_proto, ct);
163
164 nla_nest_end(skb, nest_proto);
165
166 return ret;
167
168 nla_put_failure:
169 return -1;
170 }
171
172 static inline int
173 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
174 {
175 struct nlattr *nest_helper;
176 const struct nf_conn_help *help = nfct_help(ct);
177 struct nf_conntrack_helper *helper;
178
179 if (!help)
180 return 0;
181
182 helper = rcu_dereference(help->helper);
183 if (!helper)
184 goto out;
185
186 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
187 if (!nest_helper)
188 goto nla_put_failure;
189 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
190
191 if (helper->to_nlattr)
192 helper->to_nlattr(skb, ct);
193
194 nla_nest_end(skb, nest_helper);
195 out:
196 return 0;
197
198 nla_put_failure:
199 return -1;
200 }
201
202 static int
203 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
204 enum ip_conntrack_dir dir)
205 {
206 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
207 struct nlattr *nest_count;
208 const struct nf_conn_counter *acct;
209
210 acct = nf_conn_acct_find(ct);
211 if (!acct)
212 return 0;
213
214 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
215 if (!nest_count)
216 goto nla_put_failure;
217
218 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
219 cpu_to_be64(acct[dir].packets));
220 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
221 cpu_to_be64(acct[dir].bytes));
222
223 nla_nest_end(skb, nest_count);
224
225 return 0;
226
227 nla_put_failure:
228 return -1;
229 }
230
231 #ifdef CONFIG_NF_CONNTRACK_MARK
232 static inline int
233 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
234 {
235 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
236 return 0;
237
238 nla_put_failure:
239 return -1;
240 }
241 #else
242 #define ctnetlink_dump_mark(a, b) (0)
243 #endif
244
245 #ifdef CONFIG_NF_CONNTRACK_SECMARK
246 static inline int
247 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
248 {
249 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
250 return 0;
251
252 nla_put_failure:
253 return -1;
254 }
255 #else
256 #define ctnetlink_dump_secmark(a, b) (0)
257 #endif
258
259 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
260
261 static inline int
262 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
263 {
264 struct nlattr *nest_parms;
265
266 if (!(ct->status & IPS_EXPECTED))
267 return 0;
268
269 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
270 if (!nest_parms)
271 goto nla_put_failure;
272 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
273 goto nla_put_failure;
274 nla_nest_end(skb, nest_parms);
275
276 return 0;
277
278 nla_put_failure:
279 return -1;
280 }
281
282 #ifdef CONFIG_NF_NAT_NEEDED
283 static int
284 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
285 {
286 struct nlattr *nest_parms;
287
288 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
289 if (!nest_parms)
290 goto nla_put_failure;
291
292 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
293 htonl(natseq->correction_pos));
294 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
295 htonl(natseq->offset_before));
296 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
297 htonl(natseq->offset_after));
298
299 nla_nest_end(skb, nest_parms);
300
301 return 0;
302
303 nla_put_failure:
304 return -1;
305 }
306
307 static inline int
308 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
309 {
310 struct nf_nat_seq *natseq;
311 struct nf_conn_nat *nat = nfct_nat(ct);
312
313 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
314 return 0;
315
316 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
317 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
318 return -1;
319
320 natseq = &nat->seq[IP_CT_DIR_REPLY];
321 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
322 return -1;
323
324 return 0;
325 }
326 #else
327 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
328 #endif
329
330 static inline int
331 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
332 {
333 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
334 return 0;
335
336 nla_put_failure:
337 return -1;
338 }
339
340 static inline int
341 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
342 {
343 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
344 return 0;
345
346 nla_put_failure:
347 return -1;
348 }
349
350 static int
351 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
352 int event, struct nf_conn *ct)
353 {
354 struct nlmsghdr *nlh;
355 struct nfgenmsg *nfmsg;
356 struct nlattr *nest_parms;
357 unsigned int flags = pid ? NLM_F_MULTI : 0;
358
359 event |= NFNL_SUBSYS_CTNETLINK << 8;
360 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
361 if (nlh == NULL)
362 goto nlmsg_failure;
363
364 nfmsg = nlmsg_data(nlh);
365 nfmsg->nfgen_family = nf_ct_l3num(ct);
366 nfmsg->version = NFNETLINK_V0;
367 nfmsg->res_id = 0;
368
369 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
370 if (!nest_parms)
371 goto nla_put_failure;
372 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
373 goto nla_put_failure;
374 nla_nest_end(skb, nest_parms);
375
376 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
377 if (!nest_parms)
378 goto nla_put_failure;
379 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
380 goto nla_put_failure;
381 nla_nest_end(skb, nest_parms);
382
383 if (nf_ct_zone(ct))
384 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
385
386 if (ctnetlink_dump_status(skb, ct) < 0 ||
387 ctnetlink_dump_timeout(skb, ct) < 0 ||
388 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
389 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
390 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
391 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
392 ctnetlink_dump_mark(skb, ct) < 0 ||
393 ctnetlink_dump_secmark(skb, ct) < 0 ||
394 ctnetlink_dump_id(skb, ct) < 0 ||
395 ctnetlink_dump_use(skb, ct) < 0 ||
396 ctnetlink_dump_master(skb, ct) < 0 ||
397 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
398 goto nla_put_failure;
399
400 nlmsg_end(skb, nlh);
401 return skb->len;
402
403 nlmsg_failure:
404 nla_put_failure:
405 nlmsg_cancel(skb, nlh);
406 return -1;
407 }
408
409 #ifdef CONFIG_NF_CONNTRACK_EVENTS
410 static inline size_t
411 ctnetlink_proto_size(const struct nf_conn *ct)
412 {
413 struct nf_conntrack_l3proto *l3proto;
414 struct nf_conntrack_l4proto *l4proto;
415 size_t len = 0;
416
417 rcu_read_lock();
418 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
419 len += l3proto->nla_size;
420
421 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
422 len += l4proto->nla_size;
423 rcu_read_unlock();
424
425 return len;
426 }
427
428 static inline size_t
429 ctnetlink_counters_size(const struct nf_conn *ct)
430 {
431 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
432 return 0;
433 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
434 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
435 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
436 ;
437 }
438
439 static inline size_t
440 ctnetlink_nlmsg_size(const struct nf_conn *ct)
441 {
442 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
443 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
444 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
445 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
446 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
447 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
448 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
449 + ctnetlink_counters_size(ct)
450 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
451 + nla_total_size(0) /* CTA_PROTOINFO */
452 + nla_total_size(0) /* CTA_HELP */
453 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
454 #ifdef CONFIG_NF_CONNTRACK_SECMARK
455 + nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
456 #endif
457 #ifdef CONFIG_NF_NAT_NEEDED
458 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
459 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
460 #endif
461 #ifdef CONFIG_NF_CONNTRACK_MARK
462 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
463 #endif
464 + ctnetlink_proto_size(ct)
465 ;
466 }
467
468 static int
469 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
470 {
471 struct net *net;
472 struct nlmsghdr *nlh;
473 struct nfgenmsg *nfmsg;
474 struct nlattr *nest_parms;
475 struct nf_conn *ct = item->ct;
476 struct sk_buff *skb;
477 unsigned int type;
478 unsigned int flags = 0, group;
479 int err;
480
481 /* ignore our fake conntrack entry */
482 if (ct == &nf_conntrack_untracked)
483 return 0;
484
485 if (events & (1 << IPCT_DESTROY)) {
486 type = IPCTNL_MSG_CT_DELETE;
487 group = NFNLGRP_CONNTRACK_DESTROY;
488 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
489 type = IPCTNL_MSG_CT_NEW;
490 flags = NLM_F_CREATE|NLM_F_EXCL;
491 group = NFNLGRP_CONNTRACK_NEW;
492 } else if (events) {
493 type = IPCTNL_MSG_CT_NEW;
494 group = NFNLGRP_CONNTRACK_UPDATE;
495 } else
496 return 0;
497
498 net = nf_ct_net(ct);
499 if (!item->report && !nfnetlink_has_listeners(net, group))
500 return 0;
501
502 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
503 if (skb == NULL)
504 goto errout;
505
506 type |= NFNL_SUBSYS_CTNETLINK << 8;
507 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
508 if (nlh == NULL)
509 goto nlmsg_failure;
510
511 nfmsg = nlmsg_data(nlh);
512 nfmsg->nfgen_family = nf_ct_l3num(ct);
513 nfmsg->version = NFNETLINK_V0;
514 nfmsg->res_id = 0;
515
516 rcu_read_lock();
517 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
518 if (!nest_parms)
519 goto nla_put_failure;
520 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
521 goto nla_put_failure;
522 nla_nest_end(skb, nest_parms);
523
524 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
525 if (!nest_parms)
526 goto nla_put_failure;
527 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
528 goto nla_put_failure;
529 nla_nest_end(skb, nest_parms);
530
531 if (nf_ct_zone(ct))
532 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
533
534 if (ctnetlink_dump_id(skb, ct) < 0)
535 goto nla_put_failure;
536
537 if (ctnetlink_dump_status(skb, ct) < 0)
538 goto nla_put_failure;
539
540 if (events & (1 << IPCT_DESTROY)) {
541 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
542 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
543 goto nla_put_failure;
544 } else {
545 if (ctnetlink_dump_timeout(skb, ct) < 0)
546 goto nla_put_failure;
547
548 if (events & (1 << IPCT_PROTOINFO)
549 && ctnetlink_dump_protoinfo(skb, ct) < 0)
550 goto nla_put_failure;
551
552 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
553 && ctnetlink_dump_helpinfo(skb, ct) < 0)
554 goto nla_put_failure;
555
556 #ifdef CONFIG_NF_CONNTRACK_SECMARK
557 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
558 && ctnetlink_dump_secmark(skb, ct) < 0)
559 goto nla_put_failure;
560 #endif
561
562 if (events & (1 << IPCT_RELATED) &&
563 ctnetlink_dump_master(skb, ct) < 0)
564 goto nla_put_failure;
565
566 if (events & (1 << IPCT_NATSEQADJ) &&
567 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
568 goto nla_put_failure;
569 }
570
571 #ifdef CONFIG_NF_CONNTRACK_MARK
572 if ((events & (1 << IPCT_MARK) || ct->mark)
573 && ctnetlink_dump_mark(skb, ct) < 0)
574 goto nla_put_failure;
575 #endif
576 rcu_read_unlock();
577
578 nlmsg_end(skb, nlh);
579 err = nfnetlink_send(skb, net, item->pid, group, item->report,
580 GFP_ATOMIC);
581 if (err == -ENOBUFS || err == -EAGAIN)
582 return -ENOBUFS;
583
584 return 0;
585
586 nla_put_failure:
587 rcu_read_unlock();
588 nlmsg_cancel(skb, nlh);
589 nlmsg_failure:
590 kfree_skb(skb);
591 errout:
592 nfnetlink_set_err(net, 0, group, -ENOBUFS);
593 return 0;
594 }
595 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
596
597 static int ctnetlink_done(struct netlink_callback *cb)
598 {
599 if (cb->args[1])
600 nf_ct_put((struct nf_conn *)cb->args[1]);
601 return 0;
602 }
603
604 static int
605 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
606 {
607 struct net *net = sock_net(skb->sk);
608 struct nf_conn *ct, *last;
609 struct nf_conntrack_tuple_hash *h;
610 struct hlist_nulls_node *n;
611 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
612 u_int8_t l3proto = nfmsg->nfgen_family;
613
614 rcu_read_lock();
615 last = (struct nf_conn *)cb->args[1];
616 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
617 restart:
618 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
619 hnnode) {
620 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
621 continue;
622 ct = nf_ct_tuplehash_to_ctrack(h);
623 if (!atomic_inc_not_zero(&ct->ct_general.use))
624 continue;
625 /* Dump entries of a given L3 protocol number.
626 * If it is not specified, ie. l3proto == 0,
627 * then dump everything. */
628 if (l3proto && nf_ct_l3num(ct) != l3proto)
629 goto releasect;
630 if (cb->args[1]) {
631 if (ct != last)
632 goto releasect;
633 cb->args[1] = 0;
634 }
635 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
636 cb->nlh->nlmsg_seq,
637 IPCTNL_MSG_CT_NEW, ct) < 0) {
638 cb->args[1] = (unsigned long)ct;
639 goto out;
640 }
641
642 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
643 IPCTNL_MSG_CT_GET_CTRZERO) {
644 struct nf_conn_counter *acct;
645
646 acct = nf_conn_acct_find(ct);
647 if (acct)
648 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
649 }
650 releasect:
651 nf_ct_put(ct);
652 }
653 if (cb->args[1]) {
654 cb->args[1] = 0;
655 goto restart;
656 }
657 }
658 out:
659 rcu_read_unlock();
660 if (last)
661 nf_ct_put(last);
662
663 return skb->len;
664 }
665
666 static inline int
667 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
668 {
669 struct nlattr *tb[CTA_IP_MAX+1];
670 struct nf_conntrack_l3proto *l3proto;
671 int ret = 0;
672
673 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
674
675 rcu_read_lock();
676 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
677
678 if (likely(l3proto->nlattr_to_tuple)) {
679 ret = nla_validate_nested(attr, CTA_IP_MAX,
680 l3proto->nla_policy);
681 if (ret == 0)
682 ret = l3proto->nlattr_to_tuple(tb, tuple);
683 }
684
685 rcu_read_unlock();
686
687 return ret;
688 }
689
690 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
691 [CTA_PROTO_NUM] = { .type = NLA_U8 },
692 };
693
694 static inline int
695 ctnetlink_parse_tuple_proto(struct nlattr *attr,
696 struct nf_conntrack_tuple *tuple)
697 {
698 struct nlattr *tb[CTA_PROTO_MAX+1];
699 struct nf_conntrack_l4proto *l4proto;
700 int ret = 0;
701
702 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
703 if (ret < 0)
704 return ret;
705
706 if (!tb[CTA_PROTO_NUM])
707 return -EINVAL;
708 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
709
710 rcu_read_lock();
711 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
712
713 if (likely(l4proto->nlattr_to_tuple)) {
714 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
715 l4proto->nla_policy);
716 if (ret == 0)
717 ret = l4proto->nlattr_to_tuple(tb, tuple);
718 }
719
720 rcu_read_unlock();
721
722 return ret;
723 }
724
725 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
726 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
727 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
728 };
729
730 static int
731 ctnetlink_parse_tuple(const struct nlattr * const cda[],
732 struct nf_conntrack_tuple *tuple,
733 enum ctattr_tuple type, u_int8_t l3num)
734 {
735 struct nlattr *tb[CTA_TUPLE_MAX+1];
736 int err;
737
738 memset(tuple, 0, sizeof(*tuple));
739
740 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
741
742 if (!tb[CTA_TUPLE_IP])
743 return -EINVAL;
744
745 tuple->src.l3num = l3num;
746
747 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
748 if (err < 0)
749 return err;
750
751 if (!tb[CTA_TUPLE_PROTO])
752 return -EINVAL;
753
754 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
755 if (err < 0)
756 return err;
757
758 /* orig and expect tuples get DIR_ORIGINAL */
759 if (type == CTA_TUPLE_REPLY)
760 tuple->dst.dir = IP_CT_DIR_REPLY;
761 else
762 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
763
764 return 0;
765 }
766
767 static int
768 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
769 {
770 if (attr)
771 #ifdef CONFIG_NF_CONNTRACK_ZONES
772 *zone = ntohs(nla_get_be16(attr));
773 #else
774 return -EOPNOTSUPP;
775 #endif
776 else
777 *zone = 0;
778
779 return 0;
780 }
781
782 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
783 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
784 };
785
786 static inline int
787 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
788 {
789 struct nlattr *tb[CTA_HELP_MAX+1];
790
791 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
792
793 if (!tb[CTA_HELP_NAME])
794 return -EINVAL;
795
796 *helper_name = nla_data(tb[CTA_HELP_NAME]);
797
798 return 0;
799 }
800
801 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
802 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
803 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
804 [CTA_STATUS] = { .type = NLA_U32 },
805 [CTA_PROTOINFO] = { .type = NLA_NESTED },
806 [CTA_HELP] = { .type = NLA_NESTED },
807 [CTA_NAT_SRC] = { .type = NLA_NESTED },
808 [CTA_TIMEOUT] = { .type = NLA_U32 },
809 [CTA_MARK] = { .type = NLA_U32 },
810 [CTA_ID] = { .type = NLA_U32 },
811 [CTA_NAT_DST] = { .type = NLA_NESTED },
812 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
813 [CTA_ZONE] = { .type = NLA_U16 },
814 };
815
816 static int
817 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
818 const struct nlmsghdr *nlh,
819 const struct nlattr * const cda[])
820 {
821 struct net *net = sock_net(ctnl);
822 struct nf_conntrack_tuple_hash *h;
823 struct nf_conntrack_tuple tuple;
824 struct nf_conn *ct;
825 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
826 u_int8_t u3 = nfmsg->nfgen_family;
827 u16 zone;
828 int err;
829
830 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
831 if (err < 0)
832 return err;
833
834 if (cda[CTA_TUPLE_ORIG])
835 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
836 else if (cda[CTA_TUPLE_REPLY])
837 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
838 else {
839 /* Flush the whole table */
840 nf_conntrack_flush_report(net,
841 NETLINK_CB(skb).pid,
842 nlmsg_report(nlh));
843 return 0;
844 }
845
846 if (err < 0)
847 return err;
848
849 h = nf_conntrack_find_get(net, zone, &tuple);
850 if (!h)
851 return -ENOENT;
852
853 ct = nf_ct_tuplehash_to_ctrack(h);
854
855 if (cda[CTA_ID]) {
856 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
857 if (id != (u32)(unsigned long)ct) {
858 nf_ct_put(ct);
859 return -ENOENT;
860 }
861 }
862
863 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
864 NETLINK_CB(skb).pid,
865 nlmsg_report(nlh)) < 0) {
866 nf_ct_delete_from_lists(ct);
867 /* we failed to report the event, try later */
868 nf_ct_insert_dying_list(ct);
869 nf_ct_put(ct);
870 return 0;
871 }
872
873 /* death_by_timeout would report the event again */
874 set_bit(IPS_DYING_BIT, &ct->status);
875
876 nf_ct_kill(ct);
877 nf_ct_put(ct);
878
879 return 0;
880 }
881
882 static int
883 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
884 const struct nlmsghdr *nlh,
885 const struct nlattr * const cda[])
886 {
887 struct net *net = sock_net(ctnl);
888 struct nf_conntrack_tuple_hash *h;
889 struct nf_conntrack_tuple tuple;
890 struct nf_conn *ct;
891 struct sk_buff *skb2 = NULL;
892 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
893 u_int8_t u3 = nfmsg->nfgen_family;
894 u16 zone;
895 int err;
896
897 if (nlh->nlmsg_flags & NLM_F_DUMP)
898 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
899 ctnetlink_done);
900
901 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
902 if (err < 0)
903 return err;
904
905 if (cda[CTA_TUPLE_ORIG])
906 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
907 else if (cda[CTA_TUPLE_REPLY])
908 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
909 else
910 return -EINVAL;
911
912 if (err < 0)
913 return err;
914
915 h = nf_conntrack_find_get(net, zone, &tuple);
916 if (!h)
917 return -ENOENT;
918
919 ct = nf_ct_tuplehash_to_ctrack(h);
920
921 err = -ENOMEM;
922 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
923 if (skb2 == NULL) {
924 nf_ct_put(ct);
925 return -ENOMEM;
926 }
927
928 rcu_read_lock();
929 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
930 IPCTNL_MSG_CT_NEW, ct);
931 rcu_read_unlock();
932 nf_ct_put(ct);
933 if (err <= 0)
934 goto free;
935
936 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
937 if (err < 0)
938 goto out;
939
940 return 0;
941
942 free:
943 kfree_skb(skb2);
944 out:
945 return err;
946 }
947
948 #ifdef CONFIG_NF_NAT_NEEDED
949 static int
950 ctnetlink_parse_nat_setup(struct nf_conn *ct,
951 enum nf_nat_manip_type manip,
952 const struct nlattr *attr)
953 {
954 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
955
956 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
957 if (!parse_nat_setup) {
958 #ifdef CONFIG_MODULES
959 rcu_read_unlock();
960 spin_unlock_bh(&nf_conntrack_lock);
961 nfnl_unlock();
962 if (request_module("nf-nat-ipv4") < 0) {
963 nfnl_lock();
964 spin_lock_bh(&nf_conntrack_lock);
965 rcu_read_lock();
966 return -EOPNOTSUPP;
967 }
968 nfnl_lock();
969 spin_lock_bh(&nf_conntrack_lock);
970 rcu_read_lock();
971 if (nfnetlink_parse_nat_setup_hook)
972 return -EAGAIN;
973 #endif
974 return -EOPNOTSUPP;
975 }
976
977 return parse_nat_setup(ct, manip, attr);
978 }
979 #endif
980
981 static int
982 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
983 {
984 unsigned long d;
985 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
986 d = ct->status ^ status;
987
988 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
989 /* unchangeable */
990 return -EBUSY;
991
992 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
993 /* SEEN_REPLY bit can only be set */
994 return -EBUSY;
995
996 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
997 /* ASSURED bit can only be set */
998 return -EBUSY;
999
1000 /* Be careful here, modifying NAT bits can screw up things,
1001 * so don't let users modify them directly if they don't pass
1002 * nf_nat_range. */
1003 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1004 return 0;
1005 }
1006
1007 static int
1008 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1009 {
1010 #ifdef CONFIG_NF_NAT_NEEDED
1011 int ret;
1012
1013 if (cda[CTA_NAT_DST]) {
1014 ret = ctnetlink_parse_nat_setup(ct,
1015 IP_NAT_MANIP_DST,
1016 cda[CTA_NAT_DST]);
1017 if (ret < 0)
1018 return ret;
1019 }
1020 if (cda[CTA_NAT_SRC]) {
1021 ret = ctnetlink_parse_nat_setup(ct,
1022 IP_NAT_MANIP_SRC,
1023 cda[CTA_NAT_SRC]);
1024 if (ret < 0)
1025 return ret;
1026 }
1027 return 0;
1028 #else
1029 return -EOPNOTSUPP;
1030 #endif
1031 }
1032
1033 static inline int
1034 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1035 {
1036 struct nf_conntrack_helper *helper;
1037 struct nf_conn_help *help = nfct_help(ct);
1038 char *helpname = NULL;
1039 int err;
1040
1041 /* don't change helper of sibling connections */
1042 if (ct->master)
1043 return -EBUSY;
1044
1045 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1046 if (err < 0)
1047 return err;
1048
1049 if (!strcmp(helpname, "")) {
1050 if (help && help->helper) {
1051 /* we had a helper before ... */
1052 nf_ct_remove_expectations(ct);
1053 rcu_assign_pointer(help->helper, NULL);
1054 }
1055
1056 return 0;
1057 }
1058
1059 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1060 nf_ct_protonum(ct));
1061 if (helper == NULL) {
1062 #ifdef CONFIG_MODULES
1063 spin_unlock_bh(&nf_conntrack_lock);
1064
1065 if (request_module("nfct-helper-%s", helpname) < 0) {
1066 spin_lock_bh(&nf_conntrack_lock);
1067 return -EOPNOTSUPP;
1068 }
1069
1070 spin_lock_bh(&nf_conntrack_lock);
1071 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1072 nf_ct_protonum(ct));
1073 if (helper)
1074 return -EAGAIN;
1075 #endif
1076 return -EOPNOTSUPP;
1077 }
1078
1079 if (help) {
1080 if (help->helper == helper)
1081 return 0;
1082 if (help->helper)
1083 return -EBUSY;
1084 /* need to zero data of old helper */
1085 memset(&help->help, 0, sizeof(help->help));
1086 } else {
1087 /* we cannot set a helper for an existing conntrack */
1088 return -EOPNOTSUPP;
1089 }
1090
1091 rcu_assign_pointer(help->helper, helper);
1092
1093 return 0;
1094 }
1095
1096 static inline int
1097 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1098 {
1099 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1100
1101 if (!del_timer(&ct->timeout))
1102 return -ETIME;
1103
1104 ct->timeout.expires = jiffies + timeout * HZ;
1105 add_timer(&ct->timeout);
1106
1107 return 0;
1108 }
1109
1110 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1111 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1112 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1113 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1114 };
1115
1116 static inline int
1117 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1118 {
1119 const struct nlattr *attr = cda[CTA_PROTOINFO];
1120 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1121 struct nf_conntrack_l4proto *l4proto;
1122 int err = 0;
1123
1124 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1125
1126 rcu_read_lock();
1127 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1128 if (l4proto->from_nlattr)
1129 err = l4proto->from_nlattr(tb, ct);
1130 rcu_read_unlock();
1131
1132 return err;
1133 }
1134
1135 #ifdef CONFIG_NF_NAT_NEEDED
1136 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1137 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1138 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1139 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1140 };
1141
1142 static inline int
1143 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1144 {
1145 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1146
1147 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1148
1149 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1150 return -EINVAL;
1151
1152 natseq->correction_pos =
1153 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1154
1155 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1156 return -EINVAL;
1157
1158 natseq->offset_before =
1159 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1160
1161 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1162 return -EINVAL;
1163
1164 natseq->offset_after =
1165 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1166
1167 return 0;
1168 }
1169
1170 static int
1171 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1172 const struct nlattr * const cda[])
1173 {
1174 int ret = 0;
1175 struct nf_conn_nat *nat = nfct_nat(ct);
1176
1177 if (!nat)
1178 return 0;
1179
1180 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1181 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1182 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1183 if (ret < 0)
1184 return ret;
1185
1186 ct->status |= IPS_SEQ_ADJUST;
1187 }
1188
1189 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1190 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1191 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1192 if (ret < 0)
1193 return ret;
1194
1195 ct->status |= IPS_SEQ_ADJUST;
1196 }
1197
1198 return 0;
1199 }
1200 #endif
1201
1202 static int
1203 ctnetlink_change_conntrack(struct nf_conn *ct,
1204 const struct nlattr * const cda[])
1205 {
1206 int err;
1207
1208 /* only allow NAT changes and master assignation for new conntracks */
1209 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1210 return -EOPNOTSUPP;
1211
1212 if (cda[CTA_HELP]) {
1213 err = ctnetlink_change_helper(ct, cda);
1214 if (err < 0)
1215 return err;
1216 }
1217
1218 if (cda[CTA_TIMEOUT]) {
1219 err = ctnetlink_change_timeout(ct, cda);
1220 if (err < 0)
1221 return err;
1222 }
1223
1224 if (cda[CTA_STATUS]) {
1225 err = ctnetlink_change_status(ct, cda);
1226 if (err < 0)
1227 return err;
1228 }
1229
1230 if (cda[CTA_PROTOINFO]) {
1231 err = ctnetlink_change_protoinfo(ct, cda);
1232 if (err < 0)
1233 return err;
1234 }
1235
1236 #if defined(CONFIG_NF_CONNTRACK_MARK)
1237 if (cda[CTA_MARK])
1238 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1239 #endif
1240
1241 #ifdef CONFIG_NF_NAT_NEEDED
1242 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1243 err = ctnetlink_change_nat_seq_adj(ct, cda);
1244 if (err < 0)
1245 return err;
1246 }
1247 #endif
1248
1249 return 0;
1250 }
1251
1252 static struct nf_conn *
1253 ctnetlink_create_conntrack(struct net *net, u16 zone,
1254 const struct nlattr * const cda[],
1255 struct nf_conntrack_tuple *otuple,
1256 struct nf_conntrack_tuple *rtuple,
1257 u8 u3)
1258 {
1259 struct nf_conn *ct;
1260 int err = -EINVAL;
1261 struct nf_conntrack_helper *helper;
1262
1263 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1264 if (IS_ERR(ct))
1265 return ERR_PTR(-ENOMEM);
1266
1267 if (!cda[CTA_TIMEOUT])
1268 goto err1;
1269 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1270
1271 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1272
1273 rcu_read_lock();
1274 if (cda[CTA_HELP]) {
1275 char *helpname = NULL;
1276
1277 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1278 if (err < 0)
1279 goto err2;
1280
1281 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1282 nf_ct_protonum(ct));
1283 if (helper == NULL) {
1284 rcu_read_unlock();
1285 #ifdef CONFIG_MODULES
1286 if (request_module("nfct-helper-%s", helpname) < 0) {
1287 err = -EOPNOTSUPP;
1288 goto err1;
1289 }
1290
1291 rcu_read_lock();
1292 helper = __nf_conntrack_helper_find(helpname,
1293 nf_ct_l3num(ct),
1294 nf_ct_protonum(ct));
1295 if (helper) {
1296 err = -EAGAIN;
1297 goto err2;
1298 }
1299 rcu_read_unlock();
1300 #endif
1301 err = -EOPNOTSUPP;
1302 goto err1;
1303 } else {
1304 struct nf_conn_help *help;
1305
1306 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1307 if (help == NULL) {
1308 err = -ENOMEM;
1309 goto err2;
1310 }
1311
1312 /* not in hash table yet so not strictly necessary */
1313 rcu_assign_pointer(help->helper, helper);
1314 }
1315 } else {
1316 /* try an implicit helper assignation */
1317 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1318 if (err < 0)
1319 goto err2;
1320 }
1321
1322 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1323 err = ctnetlink_change_nat(ct, cda);
1324 if (err < 0)
1325 goto err2;
1326 }
1327
1328 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1329 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1330 /* we must add conntrack extensions before confirmation. */
1331 ct->status |= IPS_CONFIRMED;
1332
1333 if (cda[CTA_STATUS]) {
1334 err = ctnetlink_change_status(ct, cda);
1335 if (err < 0)
1336 goto err2;
1337 }
1338
1339 #ifdef CONFIG_NF_NAT_NEEDED
1340 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1341 err = ctnetlink_change_nat_seq_adj(ct, cda);
1342 if (err < 0)
1343 goto err2;
1344 }
1345 #endif
1346
1347 if (cda[CTA_PROTOINFO]) {
1348 err = ctnetlink_change_protoinfo(ct, cda);
1349 if (err < 0)
1350 goto err2;
1351 }
1352
1353 #if defined(CONFIG_NF_CONNTRACK_MARK)
1354 if (cda[CTA_MARK])
1355 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1356 #endif
1357
1358 /* setup master conntrack: this is a confirmed expectation */
1359 if (cda[CTA_TUPLE_MASTER]) {
1360 struct nf_conntrack_tuple master;
1361 struct nf_conntrack_tuple_hash *master_h;
1362 struct nf_conn *master_ct;
1363
1364 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1365 if (err < 0)
1366 goto err2;
1367
1368 master_h = nf_conntrack_find_get(net, zone, &master);
1369 if (master_h == NULL) {
1370 err = -ENOENT;
1371 goto err2;
1372 }
1373 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1374 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1375 ct->master = master_ct;
1376 }
1377
1378 add_timer(&ct->timeout);
1379 nf_conntrack_hash_insert(ct);
1380 rcu_read_unlock();
1381
1382 return ct;
1383
1384 err2:
1385 rcu_read_unlock();
1386 err1:
1387 nf_conntrack_free(ct);
1388 return ERR_PTR(err);
1389 }
1390
1391 static int
1392 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1393 const struct nlmsghdr *nlh,
1394 const struct nlattr * const cda[])
1395 {
1396 struct net *net = sock_net(ctnl);
1397 struct nf_conntrack_tuple otuple, rtuple;
1398 struct nf_conntrack_tuple_hash *h = NULL;
1399 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1400 u_int8_t u3 = nfmsg->nfgen_family;
1401 u16 zone;
1402 int err;
1403
1404 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1405 if (err < 0)
1406 return err;
1407
1408 if (cda[CTA_TUPLE_ORIG]) {
1409 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1410 if (err < 0)
1411 return err;
1412 }
1413
1414 if (cda[CTA_TUPLE_REPLY]) {
1415 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1416 if (err < 0)
1417 return err;
1418 }
1419
1420 spin_lock_bh(&nf_conntrack_lock);
1421 if (cda[CTA_TUPLE_ORIG])
1422 h = __nf_conntrack_find(net, zone, &otuple);
1423 else if (cda[CTA_TUPLE_REPLY])
1424 h = __nf_conntrack_find(net, zone, &rtuple);
1425
1426 if (h == NULL) {
1427 err = -ENOENT;
1428 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1429 struct nf_conn *ct;
1430 enum ip_conntrack_events events;
1431
1432 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1433 &rtuple, u3);
1434 if (IS_ERR(ct)) {
1435 err = PTR_ERR(ct);
1436 goto out_unlock;
1437 }
1438 err = 0;
1439 nf_conntrack_get(&ct->ct_general);
1440 spin_unlock_bh(&nf_conntrack_lock);
1441 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1442 events = IPCT_RELATED;
1443 else
1444 events = IPCT_NEW;
1445
1446 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1447 (1 << IPCT_ASSURED) |
1448 (1 << IPCT_HELPER) |
1449 (1 << IPCT_PROTOINFO) |
1450 (1 << IPCT_NATSEQADJ) |
1451 (1 << IPCT_MARK) | events,
1452 ct, NETLINK_CB(skb).pid,
1453 nlmsg_report(nlh));
1454 nf_ct_put(ct);
1455 } else
1456 spin_unlock_bh(&nf_conntrack_lock);
1457
1458 return err;
1459 }
1460 /* implicit 'else' */
1461
1462 /* We manipulate the conntrack inside the global conntrack table lock,
1463 * so there's no need to increase the refcount */
1464 err = -EEXIST;
1465 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1466 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1467
1468 err = ctnetlink_change_conntrack(ct, cda);
1469 if (err == 0) {
1470 nf_conntrack_get(&ct->ct_general);
1471 spin_unlock_bh(&nf_conntrack_lock);
1472 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1473 (1 << IPCT_ASSURED) |
1474 (1 << IPCT_HELPER) |
1475 (1 << IPCT_PROTOINFO) |
1476 (1 << IPCT_NATSEQADJ) |
1477 (1 << IPCT_MARK),
1478 ct, NETLINK_CB(skb).pid,
1479 nlmsg_report(nlh));
1480 nf_ct_put(ct);
1481 } else
1482 spin_unlock_bh(&nf_conntrack_lock);
1483
1484 return err;
1485 }
1486
1487 out_unlock:
1488 spin_unlock_bh(&nf_conntrack_lock);
1489 return err;
1490 }
1491
1492 /***********************************************************************
1493 * EXPECT
1494 ***********************************************************************/
1495
1496 static inline int
1497 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1498 const struct nf_conntrack_tuple *tuple,
1499 enum ctattr_expect type)
1500 {
1501 struct nlattr *nest_parms;
1502
1503 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1504 if (!nest_parms)
1505 goto nla_put_failure;
1506 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1507 goto nla_put_failure;
1508 nla_nest_end(skb, nest_parms);
1509
1510 return 0;
1511
1512 nla_put_failure:
1513 return -1;
1514 }
1515
1516 static inline int
1517 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1518 const struct nf_conntrack_tuple *tuple,
1519 const struct nf_conntrack_tuple_mask *mask)
1520 {
1521 int ret;
1522 struct nf_conntrack_l3proto *l3proto;
1523 struct nf_conntrack_l4proto *l4proto;
1524 struct nf_conntrack_tuple m;
1525 struct nlattr *nest_parms;
1526
1527 memset(&m, 0xFF, sizeof(m));
1528 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1529 m.src.u.all = mask->src.u.all;
1530 m.dst.protonum = tuple->dst.protonum;
1531
1532 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1533 if (!nest_parms)
1534 goto nla_put_failure;
1535
1536 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1537 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1538
1539 if (unlikely(ret < 0))
1540 goto nla_put_failure;
1541
1542 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1543 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1544 if (unlikely(ret < 0))
1545 goto nla_put_failure;
1546
1547 nla_nest_end(skb, nest_parms);
1548
1549 return 0;
1550
1551 nla_put_failure:
1552 return -1;
1553 }
1554
1555 static int
1556 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1557 const struct nf_conntrack_expect *exp)
1558 {
1559 struct nf_conn *master = exp->master;
1560 struct nf_conntrack_helper *helper;
1561 long timeout = (exp->timeout.expires - jiffies) / HZ;
1562
1563 if (timeout < 0)
1564 timeout = 0;
1565
1566 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1567 goto nla_put_failure;
1568 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1569 goto nla_put_failure;
1570 if (ctnetlink_exp_dump_tuple(skb,
1571 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1572 CTA_EXPECT_MASTER) < 0)
1573 goto nla_put_failure;
1574
1575 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1576 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1577 helper = rcu_dereference(nfct_help(master)->helper);
1578 if (helper)
1579 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1580
1581 return 0;
1582
1583 nla_put_failure:
1584 return -1;
1585 }
1586
1587 static int
1588 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1589 int event, const struct nf_conntrack_expect *exp)
1590 {
1591 struct nlmsghdr *nlh;
1592 struct nfgenmsg *nfmsg;
1593 unsigned int flags = pid ? NLM_F_MULTI : 0;
1594
1595 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1596 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1597 if (nlh == NULL)
1598 goto nlmsg_failure;
1599
1600 nfmsg = nlmsg_data(nlh);
1601 nfmsg->nfgen_family = exp->tuple.src.l3num;
1602 nfmsg->version = NFNETLINK_V0;
1603 nfmsg->res_id = 0;
1604
1605 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1606 goto nla_put_failure;
1607
1608 nlmsg_end(skb, nlh);
1609 return skb->len;
1610
1611 nlmsg_failure:
1612 nla_put_failure:
1613 nlmsg_cancel(skb, nlh);
1614 return -1;
1615 }
1616
1617 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1618 static int
1619 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1620 {
1621 struct nf_conntrack_expect *exp = item->exp;
1622 struct net *net = nf_ct_exp_net(exp);
1623 struct nlmsghdr *nlh;
1624 struct nfgenmsg *nfmsg;
1625 struct sk_buff *skb;
1626 unsigned int type;
1627 int flags = 0;
1628
1629 if (events & (1 << IPEXP_NEW)) {
1630 type = IPCTNL_MSG_EXP_NEW;
1631 flags = NLM_F_CREATE|NLM_F_EXCL;
1632 } else
1633 return 0;
1634
1635 if (!item->report &&
1636 !nfnetlink_has_listeners(net, NFNLGRP_CONNTRACK_EXP_NEW))
1637 return 0;
1638
1639 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1640 if (skb == NULL)
1641 goto errout;
1642
1643 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1644 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1645 if (nlh == NULL)
1646 goto nlmsg_failure;
1647
1648 nfmsg = nlmsg_data(nlh);
1649 nfmsg->nfgen_family = exp->tuple.src.l3num;
1650 nfmsg->version = NFNETLINK_V0;
1651 nfmsg->res_id = 0;
1652
1653 rcu_read_lock();
1654 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1655 goto nla_put_failure;
1656 rcu_read_unlock();
1657
1658 nlmsg_end(skb, nlh);
1659 nfnetlink_send(skb, net, item->pid, NFNLGRP_CONNTRACK_EXP_NEW,
1660 item->report, GFP_ATOMIC);
1661 return 0;
1662
1663 nla_put_failure:
1664 rcu_read_unlock();
1665 nlmsg_cancel(skb, nlh);
1666 nlmsg_failure:
1667 kfree_skb(skb);
1668 errout:
1669 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1670 return 0;
1671 }
1672 #endif
1673 static int ctnetlink_exp_done(struct netlink_callback *cb)
1674 {
1675 if (cb->args[1])
1676 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1677 return 0;
1678 }
1679
1680 static int
1681 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1682 {
1683 struct net *net = sock_net(skb->sk);
1684 struct nf_conntrack_expect *exp, *last;
1685 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1686 struct hlist_node *n;
1687 u_int8_t l3proto = nfmsg->nfgen_family;
1688
1689 rcu_read_lock();
1690 last = (struct nf_conntrack_expect *)cb->args[1];
1691 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1692 restart:
1693 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1694 hnode) {
1695 if (l3proto && exp->tuple.src.l3num != l3proto)
1696 continue;
1697 if (cb->args[1]) {
1698 if (exp != last)
1699 continue;
1700 cb->args[1] = 0;
1701 }
1702 if (ctnetlink_exp_fill_info(skb,
1703 NETLINK_CB(cb->skb).pid,
1704 cb->nlh->nlmsg_seq,
1705 IPCTNL_MSG_EXP_NEW,
1706 exp) < 0) {
1707 if (!atomic_inc_not_zero(&exp->use))
1708 continue;
1709 cb->args[1] = (unsigned long)exp;
1710 goto out;
1711 }
1712 }
1713 if (cb->args[1]) {
1714 cb->args[1] = 0;
1715 goto restart;
1716 }
1717 }
1718 out:
1719 rcu_read_unlock();
1720 if (last)
1721 nf_ct_expect_put(last);
1722
1723 return skb->len;
1724 }
1725
1726 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1727 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1728 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1729 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1730 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1731 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1732 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1733 };
1734
1735 static int
1736 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1737 const struct nlmsghdr *nlh,
1738 const struct nlattr * const cda[])
1739 {
1740 struct net *net = sock_net(ctnl);
1741 struct nf_conntrack_tuple tuple;
1742 struct nf_conntrack_expect *exp;
1743 struct sk_buff *skb2;
1744 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1745 u_int8_t u3 = nfmsg->nfgen_family;
1746 u16 zone;
1747 int err;
1748
1749 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1750 return netlink_dump_start(ctnl, skb, nlh,
1751 ctnetlink_exp_dump_table,
1752 ctnetlink_exp_done);
1753 }
1754
1755 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1756 if (err < 0)
1757 return err;
1758
1759 if (cda[CTA_EXPECT_MASTER])
1760 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1761 else
1762 return -EINVAL;
1763
1764 if (err < 0)
1765 return err;
1766
1767 exp = nf_ct_expect_find_get(net, zone, &tuple);
1768 if (!exp)
1769 return -ENOENT;
1770
1771 if (cda[CTA_EXPECT_ID]) {
1772 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1773 if (ntohl(id) != (u32)(unsigned long)exp) {
1774 nf_ct_expect_put(exp);
1775 return -ENOENT;
1776 }
1777 }
1778
1779 err = -ENOMEM;
1780 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1781 if (skb2 == NULL)
1782 goto out;
1783
1784 rcu_read_lock();
1785 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1786 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1787 rcu_read_unlock();
1788 if (err <= 0)
1789 goto free;
1790
1791 nf_ct_expect_put(exp);
1792
1793 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1794
1795 free:
1796 kfree_skb(skb2);
1797 out:
1798 nf_ct_expect_put(exp);
1799 return err;
1800 }
1801
1802 static int
1803 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1804 const struct nlmsghdr *nlh,
1805 const struct nlattr * const cda[])
1806 {
1807 struct net *net = sock_net(ctnl);
1808 struct nf_conntrack_expect *exp;
1809 struct nf_conntrack_tuple tuple;
1810 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1811 struct hlist_node *n, *next;
1812 u_int8_t u3 = nfmsg->nfgen_family;
1813 unsigned int i;
1814 u16 zone;
1815 int err;
1816
1817 if (cda[CTA_EXPECT_TUPLE]) {
1818 /* delete a single expect by tuple */
1819 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1820 if (err < 0)
1821 return err;
1822
1823 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1824 if (err < 0)
1825 return err;
1826
1827 /* bump usage count to 2 */
1828 exp = nf_ct_expect_find_get(net, zone, &tuple);
1829 if (!exp)
1830 return -ENOENT;
1831
1832 if (cda[CTA_EXPECT_ID]) {
1833 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1834 if (ntohl(id) != (u32)(unsigned long)exp) {
1835 nf_ct_expect_put(exp);
1836 return -ENOENT;
1837 }
1838 }
1839
1840 /* after list removal, usage count == 1 */
1841 nf_ct_unexpect_related(exp);
1842 /* have to put what we 'get' above.
1843 * after this line usage count == 0 */
1844 nf_ct_expect_put(exp);
1845 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1846 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1847 struct nf_conn_help *m_help;
1848
1849 /* delete all expectations for this helper */
1850 spin_lock_bh(&nf_conntrack_lock);
1851 for (i = 0; i < nf_ct_expect_hsize; i++) {
1852 hlist_for_each_entry_safe(exp, n, next,
1853 &net->ct.expect_hash[i],
1854 hnode) {
1855 m_help = nfct_help(exp->master);
1856 if (!strcmp(m_help->helper->name, name) &&
1857 del_timer(&exp->timeout)) {
1858 nf_ct_unlink_expect(exp);
1859 nf_ct_expect_put(exp);
1860 }
1861 }
1862 }
1863 spin_unlock_bh(&nf_conntrack_lock);
1864 } else {
1865 /* This basically means we have to flush everything*/
1866 spin_lock_bh(&nf_conntrack_lock);
1867 for (i = 0; i < nf_ct_expect_hsize; i++) {
1868 hlist_for_each_entry_safe(exp, n, next,
1869 &net->ct.expect_hash[i],
1870 hnode) {
1871 if (del_timer(&exp->timeout)) {
1872 nf_ct_unlink_expect(exp);
1873 nf_ct_expect_put(exp);
1874 }
1875 }
1876 }
1877 spin_unlock_bh(&nf_conntrack_lock);
1878 }
1879
1880 return 0;
1881 }
1882 static int
1883 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1884 const struct nlattr * const cda[])
1885 {
1886 return -EOPNOTSUPP;
1887 }
1888
1889 static int
1890 ctnetlink_create_expect(struct net *net, u16 zone,
1891 const struct nlattr * const cda[],
1892 u_int8_t u3,
1893 u32 pid, int report)
1894 {
1895 struct nf_conntrack_tuple tuple, mask, master_tuple;
1896 struct nf_conntrack_tuple_hash *h = NULL;
1897 struct nf_conntrack_expect *exp;
1898 struct nf_conn *ct;
1899 struct nf_conn_help *help;
1900 int err = 0;
1901
1902 /* caller guarantees that those three CTA_EXPECT_* exist */
1903 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1904 if (err < 0)
1905 return err;
1906 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1907 if (err < 0)
1908 return err;
1909 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1910 if (err < 0)
1911 return err;
1912
1913 /* Look for master conntrack of this expectation */
1914 h = nf_conntrack_find_get(net, zone, &master_tuple);
1915 if (!h)
1916 return -ENOENT;
1917 ct = nf_ct_tuplehash_to_ctrack(h);
1918 help = nfct_help(ct);
1919
1920 if (!help || !help->helper) {
1921 /* such conntrack hasn't got any helper, abort */
1922 err = -EOPNOTSUPP;
1923 goto out;
1924 }
1925
1926 exp = nf_ct_expect_alloc(ct);
1927 if (!exp) {
1928 err = -ENOMEM;
1929 goto out;
1930 }
1931
1932 exp->class = 0;
1933 exp->expectfn = NULL;
1934 exp->flags = 0;
1935 exp->master = ct;
1936 exp->helper = NULL;
1937 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1938 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1939 exp->mask.src.u.all = mask.src.u.all;
1940
1941 err = nf_ct_expect_related_report(exp, pid, report);
1942 nf_ct_expect_put(exp);
1943
1944 out:
1945 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1946 return err;
1947 }
1948
1949 static int
1950 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1951 const struct nlmsghdr *nlh,
1952 const struct nlattr * const cda[])
1953 {
1954 struct net *net = sock_net(ctnl);
1955 struct nf_conntrack_tuple tuple;
1956 struct nf_conntrack_expect *exp;
1957 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1958 u_int8_t u3 = nfmsg->nfgen_family;
1959 u16 zone;
1960 int err;
1961
1962 if (!cda[CTA_EXPECT_TUPLE]
1963 || !cda[CTA_EXPECT_MASK]
1964 || !cda[CTA_EXPECT_MASTER])
1965 return -EINVAL;
1966
1967 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1968 if (err < 0)
1969 return err;
1970
1971 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1972 if (err < 0)
1973 return err;
1974
1975 spin_lock_bh(&nf_conntrack_lock);
1976 exp = __nf_ct_expect_find(net, zone, &tuple);
1977
1978 if (!exp) {
1979 spin_unlock_bh(&nf_conntrack_lock);
1980 err = -ENOENT;
1981 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1982 err = ctnetlink_create_expect(net, zone, cda,
1983 u3,
1984 NETLINK_CB(skb).pid,
1985 nlmsg_report(nlh));
1986 }
1987 return err;
1988 }
1989
1990 err = -EEXIST;
1991 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1992 err = ctnetlink_change_expect(exp, cda);
1993 spin_unlock_bh(&nf_conntrack_lock);
1994
1995 return err;
1996 }
1997
1998 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1999 static struct nf_ct_event_notifier ctnl_notifier = {
2000 .fcn = ctnetlink_conntrack_event,
2001 };
2002
2003 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2004 .fcn = ctnetlink_expect_event,
2005 };
2006 #endif
2007
2008 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2009 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2010 .attr_count = CTA_MAX,
2011 .policy = ct_nla_policy },
2012 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2013 .attr_count = CTA_MAX,
2014 .policy = ct_nla_policy },
2015 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2016 .attr_count = CTA_MAX,
2017 .policy = ct_nla_policy },
2018 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2019 .attr_count = CTA_MAX,
2020 .policy = ct_nla_policy },
2021 };
2022
2023 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2024 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2025 .attr_count = CTA_EXPECT_MAX,
2026 .policy = exp_nla_policy },
2027 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2028 .attr_count = CTA_EXPECT_MAX,
2029 .policy = exp_nla_policy },
2030 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2031 .attr_count = CTA_EXPECT_MAX,
2032 .policy = exp_nla_policy },
2033 };
2034
2035 static const struct nfnetlink_subsystem ctnl_subsys = {
2036 .name = "conntrack",
2037 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2038 .cb_count = IPCTNL_MSG_MAX,
2039 .cb = ctnl_cb,
2040 };
2041
2042 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2043 .name = "conntrack_expect",
2044 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2045 .cb_count = IPCTNL_MSG_EXP_MAX,
2046 .cb = ctnl_exp_cb,
2047 };
2048
2049 MODULE_ALIAS("ip_conntrack_netlink");
2050 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2051 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2052
2053 static int __init ctnetlink_init(void)
2054 {
2055 int ret;
2056
2057 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
2058 ret = nfnetlink_subsys_register(&ctnl_subsys);
2059 if (ret < 0) {
2060 printk("ctnetlink_init: cannot register with nfnetlink.\n");
2061 goto err_out;
2062 }
2063
2064 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2065 if (ret < 0) {
2066 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
2067 goto err_unreg_subsys;
2068 }
2069
2070 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2071 ret = nf_conntrack_register_notifier(&ctnl_notifier);
2072 if (ret < 0) {
2073 printk("ctnetlink_init: cannot register notifier.\n");
2074 goto err_unreg_exp_subsys;
2075 }
2076
2077 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2078 if (ret < 0) {
2079 printk("ctnetlink_init: cannot expect register notifier.\n");
2080 goto err_unreg_notifier;
2081 }
2082 #endif
2083
2084 return 0;
2085
2086 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2087 err_unreg_notifier:
2088 nf_conntrack_unregister_notifier(&ctnl_notifier);
2089 err_unreg_exp_subsys:
2090 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2091 #endif
2092 err_unreg_subsys:
2093 nfnetlink_subsys_unregister(&ctnl_subsys);
2094 err_out:
2095 return ret;
2096 }
2097
2098 static void __exit ctnetlink_exit(void)
2099 {
2100 printk("ctnetlink: unregistering from nfnetlink.\n");
2101
2102 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2103 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2104 nf_conntrack_unregister_notifier(&ctnl_notifier);
2105 #endif
2106
2107 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2108 nfnetlink_subsys_unregister(&ctnl_subsys);
2109 return;
2110 }
2111
2112 module_init(ctnetlink_init);
2113 module_exit(ctnetlink_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree