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netfilter: fix race in conntrack between dump_table and destroy
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / netfilter / nf_conntrack_netlink.c
blob5cb8d3027b18b1cb990229a30db52a3e8004fe1a
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/security.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
32
33 #include <linux/netfilter.h>
34 #include <net/netlink.h>
35 #include <net/sock.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_core.h>
38 #include <net/netfilter/nf_conntrack_expect.h>
39 #include <net/netfilter/nf_conntrack_helper.h>
40 #include <net/netfilter/nf_conntrack_l3proto.h>
41 #include <net/netfilter/nf_conntrack_l4proto.h>
42 #include <net/netfilter/nf_conntrack_tuple.h>
43 #include <net/netfilter/nf_conntrack_acct.h>
44 #include <net/netfilter/nf_conntrack_zones.h>
45 #ifdef CONFIG_NF_NAT_NEEDED
46 #include <net/netfilter/nf_nat_core.h>
47 #include <net/netfilter/nf_nat_protocol.h>
48 #endif
49
50 #include <linux/netfilter/nfnetlink.h>
51 #include <linux/netfilter/nfnetlink_conntrack.h>
52
53 MODULE_LICENSE("GPL");
54
55 static char __initdata version[] = "0.93";
56
57 static inline int
58 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
59 const struct nf_conntrack_tuple *tuple,
60 struct nf_conntrack_l4proto *l4proto)
61 {
62 int ret = 0;
63 struct nlattr *nest_parms;
64
65 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
66 if (!nest_parms)
67 goto nla_put_failure;
68 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
69
70 if (likely(l4proto->tuple_to_nlattr))
71 ret = l4proto->tuple_to_nlattr(skb, tuple);
72
73 nla_nest_end(skb, nest_parms);
74
75 return ret;
76
77 nla_put_failure:
78 return -1;
79 }
80
81 static inline int
82 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
83 const struct nf_conntrack_tuple *tuple,
84 struct nf_conntrack_l3proto *l3proto)
85 {
86 int ret = 0;
87 struct nlattr *nest_parms;
88
89 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
90 if (!nest_parms)
91 goto nla_put_failure;
92
93 if (likely(l3proto->tuple_to_nlattr))
94 ret = l3proto->tuple_to_nlattr(skb, tuple);
95
96 nla_nest_end(skb, nest_parms);
97
98 return ret;
99
100 nla_put_failure:
101 return -1;
102 }
103
104 static int
105 ctnetlink_dump_tuples(struct sk_buff *skb,
106 const struct nf_conntrack_tuple *tuple)
107 {
108 int ret;
109 struct nf_conntrack_l3proto *l3proto;
110 struct nf_conntrack_l4proto *l4proto;
111
112 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
113 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
114
115 if (unlikely(ret < 0))
116 return ret;
117
118 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
119 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
120
121 return ret;
122 }
123
124 static inline int
125 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
126 {
127 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
128 return 0;
129
130 nla_put_failure:
131 return -1;
132 }
133
134 static inline int
135 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
136 {
137 long timeout = (ct->timeout.expires - jiffies) / HZ;
138
139 if (timeout < 0)
140 timeout = 0;
141
142 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
143 return 0;
144
145 nla_put_failure:
146 return -1;
147 }
148
149 static inline int
150 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
151 {
152 struct nf_conntrack_l4proto *l4proto;
153 struct nlattr *nest_proto;
154 int ret;
155
156 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
157 if (!l4proto->to_nlattr)
158 return 0;
159
160 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
161 if (!nest_proto)
162 goto nla_put_failure;
163
164 ret = l4proto->to_nlattr(skb, nest_proto, ct);
165
166 nla_nest_end(skb, nest_proto);
167
168 return ret;
169
170 nla_put_failure:
171 return -1;
172 }
173
174 static inline int
175 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
176 {
177 struct nlattr *nest_helper;
178 const struct nf_conn_help *help = nfct_help(ct);
179 struct nf_conntrack_helper *helper;
180
181 if (!help)
182 return 0;
183
184 helper = rcu_dereference(help->helper);
185 if (!helper)
186 goto out;
187
188 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
189 if (!nest_helper)
190 goto nla_put_failure;
191 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
192
193 if (helper->to_nlattr)
194 helper->to_nlattr(skb, ct);
195
196 nla_nest_end(skb, nest_helper);
197 out:
198 return 0;
199
200 nla_put_failure:
201 return -1;
202 }
203
204 static int
205 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
206 enum ip_conntrack_dir dir)
207 {
208 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
209 struct nlattr *nest_count;
210 const struct nf_conn_counter *acct;
211
212 acct = nf_conn_acct_find(ct);
213 if (!acct)
214 return 0;
215
216 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
217 if (!nest_count)
218 goto nla_put_failure;
219
220 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
221 cpu_to_be64(acct[dir].packets));
222 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
223 cpu_to_be64(acct[dir].bytes));
224
225 nla_nest_end(skb, nest_count);
226
227 return 0;
228
229 nla_put_failure:
230 return -1;
231 }
232
233 #ifdef CONFIG_NF_CONNTRACK_MARK
234 static inline int
235 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
236 {
237 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
238 return 0;
239
240 nla_put_failure:
241 return -1;
242 }
243 #else
244 #define ctnetlink_dump_mark(a, b) (0)
245 #endif
246
247 #ifdef CONFIG_NF_CONNTRACK_SECMARK
248 static inline int
249 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
250 {
251 struct nlattr *nest_secctx;
252 int len, ret;
253 char *secctx;
254
255 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
256 if (ret)
257 return 0;
258
259 ret = -1;
260 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
261 if (!nest_secctx)
262 goto nla_put_failure;
263
264 NLA_PUT_STRING(skb, CTA_SECCTX_NAME, secctx);
265 nla_nest_end(skb, nest_secctx);
266
267 ret = 0;
268 nla_put_failure:
269 security_release_secctx(secctx, len);
270 return ret;
271 }
272 #else
273 #define ctnetlink_dump_secctx(a, b) (0)
274 #endif
275
276 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
277
278 static inline int
279 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
280 {
281 struct nlattr *nest_parms;
282
283 if (!(ct->status & IPS_EXPECTED))
284 return 0;
285
286 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
287 if (!nest_parms)
288 goto nla_put_failure;
289 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
290 goto nla_put_failure;
291 nla_nest_end(skb, nest_parms);
292
293 return 0;
294
295 nla_put_failure:
296 return -1;
297 }
298
299 #ifdef CONFIG_NF_NAT_NEEDED
300 static int
301 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
302 {
303 struct nlattr *nest_parms;
304
305 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
306 if (!nest_parms)
307 goto nla_put_failure;
308
309 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
310 htonl(natseq->correction_pos));
311 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
312 htonl(natseq->offset_before));
313 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
314 htonl(natseq->offset_after));
315
316 nla_nest_end(skb, nest_parms);
317
318 return 0;
319
320 nla_put_failure:
321 return -1;
322 }
323
324 static inline int
325 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
326 {
327 struct nf_nat_seq *natseq;
328 struct nf_conn_nat *nat = nfct_nat(ct);
329
330 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
331 return 0;
332
333 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
334 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
335 return -1;
336
337 natseq = &nat->seq[IP_CT_DIR_REPLY];
338 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
339 return -1;
340
341 return 0;
342 }
343 #else
344 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
345 #endif
346
347 static inline int
348 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
349 {
350 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
351 return 0;
352
353 nla_put_failure:
354 return -1;
355 }
356
357 static inline int
358 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
359 {
360 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
361 return 0;
362
363 nla_put_failure:
364 return -1;
365 }
366
367 static int
368 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
369 int event, struct nf_conn *ct)
370 {
371 struct nlmsghdr *nlh;
372 struct nfgenmsg *nfmsg;
373 struct nlattr *nest_parms;
374 unsigned int flags = pid ? NLM_F_MULTI : 0;
375
376 event |= NFNL_SUBSYS_CTNETLINK << 8;
377 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
378 if (nlh == NULL)
379 goto nlmsg_failure;
380
381 nfmsg = nlmsg_data(nlh);
382 nfmsg->nfgen_family = nf_ct_l3num(ct);
383 nfmsg->version = NFNETLINK_V0;
384 nfmsg->res_id = 0;
385
386 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
387 if (!nest_parms)
388 goto nla_put_failure;
389 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
390 goto nla_put_failure;
391 nla_nest_end(skb, nest_parms);
392
393 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
394 if (!nest_parms)
395 goto nla_put_failure;
396 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
397 goto nla_put_failure;
398 nla_nest_end(skb, nest_parms);
399
400 if (nf_ct_zone(ct))
401 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
402
403 if (ctnetlink_dump_status(skb, ct) < 0 ||
404 ctnetlink_dump_timeout(skb, ct) < 0 ||
405 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
406 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
407 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
408 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
409 ctnetlink_dump_mark(skb, ct) < 0 ||
410 ctnetlink_dump_secctx(skb, ct) < 0 ||
411 ctnetlink_dump_id(skb, ct) < 0 ||
412 ctnetlink_dump_use(skb, ct) < 0 ||
413 ctnetlink_dump_master(skb, ct) < 0 ||
414 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
415 goto nla_put_failure;
416
417 nlmsg_end(skb, nlh);
418 return skb->len;
419
420 nlmsg_failure:
421 nla_put_failure:
422 nlmsg_cancel(skb, nlh);
423 return -1;
424 }
425
426 #ifdef CONFIG_NF_CONNTRACK_EVENTS
427 static inline size_t
428 ctnetlink_proto_size(const struct nf_conn *ct)
429 {
430 struct nf_conntrack_l3proto *l3proto;
431 struct nf_conntrack_l4proto *l4proto;
432 size_t len = 0;
433
434 rcu_read_lock();
435 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
436 len += l3proto->nla_size;
437
438 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
439 len += l4proto->nla_size;
440 rcu_read_unlock();
441
442 return len;
443 }
444
445 static inline size_t
446 ctnetlink_counters_size(const struct nf_conn *ct)
447 {
448 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
449 return 0;
450 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
451 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
452 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
453 ;
454 }
455
456 static inline int
457 ctnetlink_secctx_size(const struct nf_conn *ct)
458 {
459 #ifdef CONFIG_NF_CONNTRACK_SECMARK
460 int len, ret;
461
462 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
463 if (ret)
464 return 0;
465
466 return nla_total_size(0) /* CTA_SECCTX */
467 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
468 #else
469 return 0;
470 #endif
471 }
472
473 static inline size_t
474 ctnetlink_nlmsg_size(const struct nf_conn *ct)
475 {
476 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
477 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
478 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
479 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
480 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
481 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
482 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
483 + ctnetlink_counters_size(ct)
484 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
485 + nla_total_size(0) /* CTA_PROTOINFO */
486 + nla_total_size(0) /* CTA_HELP */
487 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
488 + ctnetlink_secctx_size(ct)
489 #ifdef CONFIG_NF_NAT_NEEDED
490 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
491 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
492 #endif
493 #ifdef CONFIG_NF_CONNTRACK_MARK
494 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
495 #endif
496 + ctnetlink_proto_size(ct)
497 ;
498 }
499
500 static int
501 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
502 {
503 struct net *net;
504 struct nlmsghdr *nlh;
505 struct nfgenmsg *nfmsg;
506 struct nlattr *nest_parms;
507 struct nf_conn *ct = item->ct;
508 struct sk_buff *skb;
509 unsigned int type;
510 unsigned int flags = 0, group;
511 int err;
512
513 /* ignore our fake conntrack entry */
514 if (nf_ct_is_untracked(ct))
515 return 0;
516
517 if (events & (1 << IPCT_DESTROY)) {
518 type = IPCTNL_MSG_CT_DELETE;
519 group = NFNLGRP_CONNTRACK_DESTROY;
520 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
521 type = IPCTNL_MSG_CT_NEW;
522 flags = NLM_F_CREATE|NLM_F_EXCL;
523 group = NFNLGRP_CONNTRACK_NEW;
524 } else if (events) {
525 type = IPCTNL_MSG_CT_NEW;
526 group = NFNLGRP_CONNTRACK_UPDATE;
527 } else
528 return 0;
529
530 net = nf_ct_net(ct);
531 if (!item->report && !nfnetlink_has_listeners(net, group))
532 return 0;
533
534 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
535 if (skb == NULL)
536 goto errout;
537
538 type |= NFNL_SUBSYS_CTNETLINK << 8;
539 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
540 if (nlh == NULL)
541 goto nlmsg_failure;
542
543 nfmsg = nlmsg_data(nlh);
544 nfmsg->nfgen_family = nf_ct_l3num(ct);
545 nfmsg->version = NFNETLINK_V0;
546 nfmsg->res_id = 0;
547
548 rcu_read_lock();
549 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
550 if (!nest_parms)
551 goto nla_put_failure;
552 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
553 goto nla_put_failure;
554 nla_nest_end(skb, nest_parms);
555
556 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
557 if (!nest_parms)
558 goto nla_put_failure;
559 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
560 goto nla_put_failure;
561 nla_nest_end(skb, nest_parms);
562
563 if (nf_ct_zone(ct))
564 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
565
566 if (ctnetlink_dump_id(skb, ct) < 0)
567 goto nla_put_failure;
568
569 if (ctnetlink_dump_status(skb, ct) < 0)
570 goto nla_put_failure;
571
572 if (events & (1 << IPCT_DESTROY)) {
573 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
574 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
575 goto nla_put_failure;
576 } else {
577 if (ctnetlink_dump_timeout(skb, ct) < 0)
578 goto nla_put_failure;
579
580 if (events & (1 << IPCT_PROTOINFO)
581 && ctnetlink_dump_protoinfo(skb, ct) < 0)
582 goto nla_put_failure;
583
584 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
585 && ctnetlink_dump_helpinfo(skb, ct) < 0)
586 goto nla_put_failure;
587
588 #ifdef CONFIG_NF_CONNTRACK_SECMARK
589 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
590 && ctnetlink_dump_secctx(skb, ct) < 0)
591 goto nla_put_failure;
592 #endif
593
594 if (events & (1 << IPCT_RELATED) &&
595 ctnetlink_dump_master(skb, ct) < 0)
596 goto nla_put_failure;
597
598 if (events & (1 << IPCT_NATSEQADJ) &&
599 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
600 goto nla_put_failure;
601 }
602
603 #ifdef CONFIG_NF_CONNTRACK_MARK
604 if ((events & (1 << IPCT_MARK) || ct->mark)
605 && ctnetlink_dump_mark(skb, ct) < 0)
606 goto nla_put_failure;
607 #endif
608 rcu_read_unlock();
609
610 nlmsg_end(skb, nlh);
611 err = nfnetlink_send(skb, net, item->pid, group, item->report,
612 GFP_ATOMIC);
613 if (err == -ENOBUFS || err == -EAGAIN)
614 return -ENOBUFS;
615
616 return 0;
617
618 nla_put_failure:
619 rcu_read_unlock();
620 nlmsg_cancel(skb, nlh);
621 nlmsg_failure:
622 kfree_skb(skb);
623 errout:
624 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
625 return -ENOBUFS;
626
627 return 0;
628 }
629 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
630
631 static int ctnetlink_done(struct netlink_callback *cb)
632 {
633 if (cb->args[1])
634 nf_ct_put((struct nf_conn *)cb->args[1]);
635 return 0;
636 }
637
638 static int
639 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
640 {
641 struct net *net = sock_net(skb->sk);
642 struct nf_conn *ct, *last;
643 struct nf_conntrack_tuple_hash *h;
644 struct hlist_nulls_node *n;
645 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
646 u_int8_t l3proto = nfmsg->nfgen_family;
647
648 spin_lock_bh(&nf_conntrack_lock);
649 last = (struct nf_conn *)cb->args[1];
650 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
651 restart:
652 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
653 hnnode) {
654 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
655 continue;
656 ct = nf_ct_tuplehash_to_ctrack(h);
657 /* Dump entries of a given L3 protocol number.
658 * If it is not specified, ie. l3proto == 0,
659 * then dump everything. */
660 if (l3proto && nf_ct_l3num(ct) != l3proto)
661 continue;
662 if (cb->args[1]) {
663 if (ct != last)
664 continue;
665 cb->args[1] = 0;
666 }
667 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
668 cb->nlh->nlmsg_seq,
669 IPCTNL_MSG_CT_NEW, ct) < 0) {
670 cb->args[1] = (unsigned long)ct;
671 goto out;
672 }
673
674 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
675 IPCTNL_MSG_CT_GET_CTRZERO) {
676 struct nf_conn_counter *acct;
677
678 acct = nf_conn_acct_find(ct);
679 if (acct)
680 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
681 }
682 }
683 if (cb->args[1]) {
684 cb->args[1] = 0;
685 goto restart;
686 }
687 }
688 out:
689 spin_unlock_bh(&nf_conntrack_lock);
690 if (last)
691 nf_ct_put(last);
692
693 return skb->len;
694 }
695
696 static inline int
697 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
698 {
699 struct nlattr *tb[CTA_IP_MAX+1];
700 struct nf_conntrack_l3proto *l3proto;
701 int ret = 0;
702
703 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
704
705 rcu_read_lock();
706 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
707
708 if (likely(l3proto->nlattr_to_tuple)) {
709 ret = nla_validate_nested(attr, CTA_IP_MAX,
710 l3proto->nla_policy);
711 if (ret == 0)
712 ret = l3proto->nlattr_to_tuple(tb, tuple);
713 }
714
715 rcu_read_unlock();
716
717 return ret;
718 }
719
720 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
721 [CTA_PROTO_NUM] = { .type = NLA_U8 },
722 };
723
724 static inline int
725 ctnetlink_parse_tuple_proto(struct nlattr *attr,
726 struct nf_conntrack_tuple *tuple)
727 {
728 struct nlattr *tb[CTA_PROTO_MAX+1];
729 struct nf_conntrack_l4proto *l4proto;
730 int ret = 0;
731
732 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
733 if (ret < 0)
734 return ret;
735
736 if (!tb[CTA_PROTO_NUM])
737 return -EINVAL;
738 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
739
740 rcu_read_lock();
741 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
742
743 if (likely(l4proto->nlattr_to_tuple)) {
744 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
745 l4proto->nla_policy);
746 if (ret == 0)
747 ret = l4proto->nlattr_to_tuple(tb, tuple);
748 }
749
750 rcu_read_unlock();
751
752 return ret;
753 }
754
755 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
756 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
757 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
758 };
759
760 static int
761 ctnetlink_parse_tuple(const struct nlattr * const cda[],
762 struct nf_conntrack_tuple *tuple,
763 enum ctattr_tuple type, u_int8_t l3num)
764 {
765 struct nlattr *tb[CTA_TUPLE_MAX+1];
766 int err;
767
768 memset(tuple, 0, sizeof(*tuple));
769
770 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
771
772 if (!tb[CTA_TUPLE_IP])
773 return -EINVAL;
774
775 tuple->src.l3num = l3num;
776
777 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
778 if (err < 0)
779 return err;
780
781 if (!tb[CTA_TUPLE_PROTO])
782 return -EINVAL;
783
784 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
785 if (err < 0)
786 return err;
787
788 /* orig and expect tuples get DIR_ORIGINAL */
789 if (type == CTA_TUPLE_REPLY)
790 tuple->dst.dir = IP_CT_DIR_REPLY;
791 else
792 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
793
794 return 0;
795 }
796
797 static int
798 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
799 {
800 if (attr)
801 #ifdef CONFIG_NF_CONNTRACK_ZONES
802 *zone = ntohs(nla_get_be16(attr));
803 #else
804 return -EOPNOTSUPP;
805 #endif
806 else
807 *zone = 0;
808
809 return 0;
810 }
811
812 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
813 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
814 };
815
816 static inline int
817 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
818 {
819 struct nlattr *tb[CTA_HELP_MAX+1];
820
821 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
822
823 if (!tb[CTA_HELP_NAME])
824 return -EINVAL;
825
826 *helper_name = nla_data(tb[CTA_HELP_NAME]);
827
828 return 0;
829 }
830
831 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
832 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
833 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
834 [CTA_STATUS] = { .type = NLA_U32 },
835 [CTA_PROTOINFO] = { .type = NLA_NESTED },
836 [CTA_HELP] = { .type = NLA_NESTED },
837 [CTA_NAT_SRC] = { .type = NLA_NESTED },
838 [CTA_TIMEOUT] = { .type = NLA_U32 },
839 [CTA_MARK] = { .type = NLA_U32 },
840 [CTA_ID] = { .type = NLA_U32 },
841 [CTA_NAT_DST] = { .type = NLA_NESTED },
842 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
843 [CTA_ZONE] = { .type = NLA_U16 },
844 };
845
846 static int
847 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
848 const struct nlmsghdr *nlh,
849 const struct nlattr * const cda[])
850 {
851 struct net *net = sock_net(ctnl);
852 struct nf_conntrack_tuple_hash *h;
853 struct nf_conntrack_tuple tuple;
854 struct nf_conn *ct;
855 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
856 u_int8_t u3 = nfmsg->nfgen_family;
857 u16 zone;
858 int err;
859
860 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
861 if (err < 0)
862 return err;
863
864 if (cda[CTA_TUPLE_ORIG])
865 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
866 else if (cda[CTA_TUPLE_REPLY])
867 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
868 else {
869 /* Flush the whole table */
870 nf_conntrack_flush_report(net,
871 NETLINK_CB(skb).pid,
872 nlmsg_report(nlh));
873 return 0;
874 }
875
876 if (err < 0)
877 return err;
878
879 h = nf_conntrack_find_get(net, zone, &tuple);
880 if (!h)
881 return -ENOENT;
882
883 ct = nf_ct_tuplehash_to_ctrack(h);
884
885 if (cda[CTA_ID]) {
886 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
887 if (id != (u32)(unsigned long)ct) {
888 nf_ct_put(ct);
889 return -ENOENT;
890 }
891 }
892
893 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
894 NETLINK_CB(skb).pid,
895 nlmsg_report(nlh)) < 0) {
896 nf_ct_delete_from_lists(ct);
897 /* we failed to report the event, try later */
898 nf_ct_insert_dying_list(ct);
899 nf_ct_put(ct);
900 return 0;
901 }
902
903 /* death_by_timeout would report the event again */
904 set_bit(IPS_DYING_BIT, &ct->status);
905
906 nf_ct_kill(ct);
907 nf_ct_put(ct);
908
909 return 0;
910 }
911
912 static int
913 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
914 const struct nlmsghdr *nlh,
915 const struct nlattr * const cda[])
916 {
917 struct net *net = sock_net(ctnl);
918 struct nf_conntrack_tuple_hash *h;
919 struct nf_conntrack_tuple tuple;
920 struct nf_conn *ct;
921 struct sk_buff *skb2 = NULL;
922 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
923 u_int8_t u3 = nfmsg->nfgen_family;
924 u16 zone;
925 int err;
926
927 if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP)
928 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
929 ctnetlink_done);
930
931 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
932 if (err < 0)
933 return err;
934
935 if (cda[CTA_TUPLE_ORIG])
936 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
937 else if (cda[CTA_TUPLE_REPLY])
938 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
939 else
940 return -EINVAL;
941
942 if (err < 0)
943 return err;
944
945 h = nf_conntrack_find_get(net, zone, &tuple);
946 if (!h)
947 return -ENOENT;
948
949 ct = nf_ct_tuplehash_to_ctrack(h);
950
951 err = -ENOMEM;
952 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
953 if (skb2 == NULL) {
954 nf_ct_put(ct);
955 return -ENOMEM;
956 }
957
958 rcu_read_lock();
959 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
960 IPCTNL_MSG_CT_NEW, ct);
961 rcu_read_unlock();
962 nf_ct_put(ct);
963 if (err <= 0)
964 goto free;
965
966 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
967 if (err < 0)
968 goto out;
969
970 return 0;
971
972 free:
973 kfree_skb(skb2);
974 out:
975 return err;
976 }
977
978 #ifdef CONFIG_NF_NAT_NEEDED
979 static int
980 ctnetlink_parse_nat_setup(struct nf_conn *ct,
981 enum nf_nat_manip_type manip,
982 const struct nlattr *attr)
983 {
984 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
985
986 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
987 if (!parse_nat_setup) {
988 #ifdef CONFIG_MODULES
989 rcu_read_unlock();
990 spin_unlock_bh(&nf_conntrack_lock);
991 nfnl_unlock();
992 if (request_module("nf-nat-ipv4") < 0) {
993 nfnl_lock();
994 spin_lock_bh(&nf_conntrack_lock);
995 rcu_read_lock();
996 return -EOPNOTSUPP;
997 }
998 nfnl_lock();
999 spin_lock_bh(&nf_conntrack_lock);
1000 rcu_read_lock();
1001 if (nfnetlink_parse_nat_setup_hook)
1002 return -EAGAIN;
1003 #endif
1004 return -EOPNOTSUPP;
1005 }
1006
1007 return parse_nat_setup(ct, manip, attr);
1008 }
1009 #endif
1010
1011 static int
1012 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1013 {
1014 unsigned long d;
1015 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1016 d = ct->status ^ status;
1017
1018 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1019 /* unchangeable */
1020 return -EBUSY;
1021
1022 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1023 /* SEEN_REPLY bit can only be set */
1024 return -EBUSY;
1025
1026 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1027 /* ASSURED bit can only be set */
1028 return -EBUSY;
1029
1030 /* Be careful here, modifying NAT bits can screw up things,
1031 * so don't let users modify them directly if they don't pass
1032 * nf_nat_range. */
1033 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1034 return 0;
1035 }
1036
1037 static int
1038 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1039 {
1040 #ifdef CONFIG_NF_NAT_NEEDED
1041 int ret;
1042
1043 if (cda[CTA_NAT_DST]) {
1044 ret = ctnetlink_parse_nat_setup(ct,
1045 IP_NAT_MANIP_DST,
1046 cda[CTA_NAT_DST]);
1047 if (ret < 0)
1048 return ret;
1049 }
1050 if (cda[CTA_NAT_SRC]) {
1051 ret = ctnetlink_parse_nat_setup(ct,
1052 IP_NAT_MANIP_SRC,
1053 cda[CTA_NAT_SRC]);
1054 if (ret < 0)
1055 return ret;
1056 }
1057 return 0;
1058 #else
1059 return -EOPNOTSUPP;
1060 #endif
1061 }
1062
1063 static inline int
1064 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1065 {
1066 struct nf_conntrack_helper *helper;
1067 struct nf_conn_help *help = nfct_help(ct);
1068 char *helpname = NULL;
1069 int err;
1070
1071 /* don't change helper of sibling connections */
1072 if (ct->master)
1073 return -EBUSY;
1074
1075 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1076 if (err < 0)
1077 return err;
1078
1079 if (!strcmp(helpname, "")) {
1080 if (help && help->helper) {
1081 /* we had a helper before ... */
1082 nf_ct_remove_expectations(ct);
1083 rcu_assign_pointer(help->helper, NULL);
1084 }
1085
1086 return 0;
1087 }
1088
1089 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1090 nf_ct_protonum(ct));
1091 if (helper == NULL) {
1092 #ifdef CONFIG_MODULES
1093 spin_unlock_bh(&nf_conntrack_lock);
1094
1095 if (request_module("nfct-helper-%s", helpname) < 0) {
1096 spin_lock_bh(&nf_conntrack_lock);
1097 return -EOPNOTSUPP;
1098 }
1099
1100 spin_lock_bh(&nf_conntrack_lock);
1101 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1102 nf_ct_protonum(ct));
1103 if (helper)
1104 return -EAGAIN;
1105 #endif
1106 return -EOPNOTSUPP;
1107 }
1108
1109 if (help) {
1110 if (help->helper == helper)
1111 return 0;
1112 if (help->helper)
1113 return -EBUSY;
1114 /* need to zero data of old helper */
1115 memset(&help->help, 0, sizeof(help->help));
1116 } else {
1117 /* we cannot set a helper for an existing conntrack */
1118 return -EOPNOTSUPP;
1119 }
1120
1121 rcu_assign_pointer(help->helper, helper);
1122
1123 return 0;
1124 }
1125
1126 static inline int
1127 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1128 {
1129 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1130
1131 if (!del_timer(&ct->timeout))
1132 return -ETIME;
1133
1134 ct->timeout.expires = jiffies + timeout * HZ;
1135 add_timer(&ct->timeout);
1136
1137 return 0;
1138 }
1139
1140 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1141 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1142 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1143 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1144 };
1145
1146 static inline int
1147 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1148 {
1149 const struct nlattr *attr = cda[CTA_PROTOINFO];
1150 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1151 struct nf_conntrack_l4proto *l4proto;
1152 int err = 0;
1153
1154 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1155
1156 rcu_read_lock();
1157 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1158 if (l4proto->from_nlattr)
1159 err = l4proto->from_nlattr(tb, ct);
1160 rcu_read_unlock();
1161
1162 return err;
1163 }
1164
1165 #ifdef CONFIG_NF_NAT_NEEDED
1166 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1167 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1168 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1169 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1170 };
1171
1172 static inline int
1173 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1174 {
1175 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1176
1177 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1178
1179 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1180 return -EINVAL;
1181
1182 natseq->correction_pos =
1183 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1184
1185 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1186 return -EINVAL;
1187
1188 natseq->offset_before =
1189 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1190
1191 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1192 return -EINVAL;
1193
1194 natseq->offset_after =
1195 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1196
1197 return 0;
1198 }
1199
1200 static int
1201 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1202 const struct nlattr * const cda[])
1203 {
1204 int ret = 0;
1205 struct nf_conn_nat *nat = nfct_nat(ct);
1206
1207 if (!nat)
1208 return 0;
1209
1210 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1211 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1212 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1213 if (ret < 0)
1214 return ret;
1215
1216 ct->status |= IPS_SEQ_ADJUST;
1217 }
1218
1219 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1220 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1221 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1222 if (ret < 0)
1223 return ret;
1224
1225 ct->status |= IPS_SEQ_ADJUST;
1226 }
1227
1228 return 0;
1229 }
1230 #endif
1231
1232 static int
1233 ctnetlink_change_conntrack(struct nf_conn *ct,
1234 const struct nlattr * const cda[])
1235 {
1236 int err;
1237
1238 /* only allow NAT changes and master assignation for new conntracks */
1239 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1240 return -EOPNOTSUPP;
1241
1242 if (cda[CTA_HELP]) {
1243 err = ctnetlink_change_helper(ct, cda);
1244 if (err < 0)
1245 return err;
1246 }
1247
1248 if (cda[CTA_TIMEOUT]) {
1249 err = ctnetlink_change_timeout(ct, cda);
1250 if (err < 0)
1251 return err;
1252 }
1253
1254 if (cda[CTA_STATUS]) {
1255 err = ctnetlink_change_status(ct, cda);
1256 if (err < 0)
1257 return err;
1258 }
1259
1260 if (cda[CTA_PROTOINFO]) {
1261 err = ctnetlink_change_protoinfo(ct, cda);
1262 if (err < 0)
1263 return err;
1264 }
1265
1266 #if defined(CONFIG_NF_CONNTRACK_MARK)
1267 if (cda[CTA_MARK])
1268 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1269 #endif
1270
1271 #ifdef CONFIG_NF_NAT_NEEDED
1272 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1273 err = ctnetlink_change_nat_seq_adj(ct, cda);
1274 if (err < 0)
1275 return err;
1276 }
1277 #endif
1278
1279 return 0;
1280 }
1281
1282 static struct nf_conn *
1283 ctnetlink_create_conntrack(struct net *net, u16 zone,
1284 const struct nlattr * const cda[],
1285 struct nf_conntrack_tuple *otuple,
1286 struct nf_conntrack_tuple *rtuple,
1287 u8 u3)
1288 {
1289 struct nf_conn *ct;
1290 int err = -EINVAL;
1291 struct nf_conntrack_helper *helper;
1292
1293 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1294 if (IS_ERR(ct))
1295 return ERR_PTR(-ENOMEM);
1296
1297 if (!cda[CTA_TIMEOUT])
1298 goto err1;
1299 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1300
1301 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1302
1303 rcu_read_lock();
1304 if (cda[CTA_HELP]) {
1305 char *helpname = NULL;
1306
1307 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1308 if (err < 0)
1309 goto err2;
1310
1311 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1312 nf_ct_protonum(ct));
1313 if (helper == NULL) {
1314 rcu_read_unlock();
1315 #ifdef CONFIG_MODULES
1316 if (request_module("nfct-helper-%s", helpname) < 0) {
1317 err = -EOPNOTSUPP;
1318 goto err1;
1319 }
1320
1321 rcu_read_lock();
1322 helper = __nf_conntrack_helper_find(helpname,
1323 nf_ct_l3num(ct),
1324 nf_ct_protonum(ct));
1325 if (helper) {
1326 err = -EAGAIN;
1327 goto err2;
1328 }
1329 rcu_read_unlock();
1330 #endif
1331 err = -EOPNOTSUPP;
1332 goto err1;
1333 } else {
1334 struct nf_conn_help *help;
1335
1336 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1337 if (help == NULL) {
1338 err = -ENOMEM;
1339 goto err2;
1340 }
1341
1342 /* not in hash table yet so not strictly necessary */
1343 rcu_assign_pointer(help->helper, helper);
1344 }
1345 } else {
1346 /* try an implicit helper assignation */
1347 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1348 if (err < 0)
1349 goto err2;
1350 }
1351
1352 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1353 err = ctnetlink_change_nat(ct, cda);
1354 if (err < 0)
1355 goto err2;
1356 }
1357
1358 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1359 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1360 /* we must add conntrack extensions before confirmation. */
1361 ct->status |= IPS_CONFIRMED;
1362
1363 if (cda[CTA_STATUS]) {
1364 err = ctnetlink_change_status(ct, cda);
1365 if (err < 0)
1366 goto err2;
1367 }
1368
1369 #ifdef CONFIG_NF_NAT_NEEDED
1370 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1371 err = ctnetlink_change_nat_seq_adj(ct, cda);
1372 if (err < 0)
1373 goto err2;
1374 }
1375 #endif
1376
1377 if (cda[CTA_PROTOINFO]) {
1378 err = ctnetlink_change_protoinfo(ct, cda);
1379 if (err < 0)
1380 goto err2;
1381 }
1382
1383 #if defined(CONFIG_NF_CONNTRACK_MARK)
1384 if (cda[CTA_MARK])
1385 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1386 #endif
1387
1388 /* setup master conntrack: this is a confirmed expectation */
1389 if (cda[CTA_TUPLE_MASTER]) {
1390 struct nf_conntrack_tuple master;
1391 struct nf_conntrack_tuple_hash *master_h;
1392 struct nf_conn *master_ct;
1393
1394 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1395 if (err < 0)
1396 goto err2;
1397
1398 master_h = nf_conntrack_find_get(net, zone, &master);
1399 if (master_h == NULL) {
1400 err = -ENOENT;
1401 goto err2;
1402 }
1403 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1404 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1405 ct->master = master_ct;
1406 }
1407
1408 add_timer(&ct->timeout);
1409 nf_conntrack_hash_insert(ct);
1410 rcu_read_unlock();
1411
1412 return ct;
1413
1414 err2:
1415 rcu_read_unlock();
1416 err1:
1417 nf_conntrack_free(ct);
1418 return ERR_PTR(err);
1419 }
1420
1421 static int
1422 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1423 const struct nlmsghdr *nlh,
1424 const struct nlattr * const cda[])
1425 {
1426 struct net *net = sock_net(ctnl);
1427 struct nf_conntrack_tuple otuple, rtuple;
1428 struct nf_conntrack_tuple_hash *h = NULL;
1429 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1430 u_int8_t u3 = nfmsg->nfgen_family;
1431 u16 zone;
1432 int err;
1433
1434 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1435 if (err < 0)
1436 return err;
1437
1438 if (cda[CTA_TUPLE_ORIG]) {
1439 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1440 if (err < 0)
1441 return err;
1442 }
1443
1444 if (cda[CTA_TUPLE_REPLY]) {
1445 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1446 if (err < 0)
1447 return err;
1448 }
1449
1450 spin_lock_bh(&nf_conntrack_lock);
1451 if (cda[CTA_TUPLE_ORIG])
1452 h = __nf_conntrack_find(net, zone, &otuple);
1453 else if (cda[CTA_TUPLE_REPLY])
1454 h = __nf_conntrack_find(net, zone, &rtuple);
1455
1456 if (h == NULL) {
1457 err = -ENOENT;
1458 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1459 struct nf_conn *ct;
1460 enum ip_conntrack_events events;
1461
1462 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1463 &rtuple, u3);
1464 if (IS_ERR(ct)) {
1465 err = PTR_ERR(ct);
1466 goto out_unlock;
1467 }
1468 err = 0;
1469 nf_conntrack_get(&ct->ct_general);
1470 spin_unlock_bh(&nf_conntrack_lock);
1471 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1472 events = IPCT_RELATED;
1473 else
1474 events = IPCT_NEW;
1475
1476 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1477 (1 << IPCT_ASSURED) |
1478 (1 << IPCT_HELPER) |
1479 (1 << IPCT_PROTOINFO) |
1480 (1 << IPCT_NATSEQADJ) |
1481 (1 << IPCT_MARK) | events,
1482 ct, NETLINK_CB(skb).pid,
1483 nlmsg_report(nlh));
1484 nf_ct_put(ct);
1485 } else
1486 spin_unlock_bh(&nf_conntrack_lock);
1487
1488 return err;
1489 }
1490 /* implicit 'else' */
1491
1492 /* We manipulate the conntrack inside the global conntrack table lock,
1493 * so there's no need to increase the refcount */
1494 err = -EEXIST;
1495 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1496 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1497
1498 err = ctnetlink_change_conntrack(ct, cda);
1499 if (err == 0) {
1500 nf_conntrack_get(&ct->ct_general);
1501 spin_unlock_bh(&nf_conntrack_lock);
1502 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1503 (1 << IPCT_ASSURED) |
1504 (1 << IPCT_HELPER) |
1505 (1 << IPCT_PROTOINFO) |
1506 (1 << IPCT_NATSEQADJ) |
1507 (1 << IPCT_MARK),
1508 ct, NETLINK_CB(skb).pid,
1509 nlmsg_report(nlh));
1510 nf_ct_put(ct);
1511 } else
1512 spin_unlock_bh(&nf_conntrack_lock);
1513
1514 return err;
1515 }
1516
1517 out_unlock:
1518 spin_unlock_bh(&nf_conntrack_lock);
1519 return err;
1520 }
1521
1522 /***********************************************************************
1523 * EXPECT
1524 ***********************************************************************/
1525
1526 static inline int
1527 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1528 const struct nf_conntrack_tuple *tuple,
1529 enum ctattr_expect type)
1530 {
1531 struct nlattr *nest_parms;
1532
1533 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1534 if (!nest_parms)
1535 goto nla_put_failure;
1536 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1537 goto nla_put_failure;
1538 nla_nest_end(skb, nest_parms);
1539
1540 return 0;
1541
1542 nla_put_failure:
1543 return -1;
1544 }
1545
1546 static inline int
1547 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1548 const struct nf_conntrack_tuple *tuple,
1549 const struct nf_conntrack_tuple_mask *mask)
1550 {
1551 int ret;
1552 struct nf_conntrack_l3proto *l3proto;
1553 struct nf_conntrack_l4proto *l4proto;
1554 struct nf_conntrack_tuple m;
1555 struct nlattr *nest_parms;
1556
1557 memset(&m, 0xFF, sizeof(m));
1558 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1559 m.src.u.all = mask->src.u.all;
1560 m.dst.protonum = tuple->dst.protonum;
1561
1562 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1563 if (!nest_parms)
1564 goto nla_put_failure;
1565
1566 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1567 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1568
1569 if (unlikely(ret < 0))
1570 goto nla_put_failure;
1571
1572 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1573 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1574 if (unlikely(ret < 0))
1575 goto nla_put_failure;
1576
1577 nla_nest_end(skb, nest_parms);
1578
1579 return 0;
1580
1581 nla_put_failure:
1582 return -1;
1583 }
1584
1585 static int
1586 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1587 const struct nf_conntrack_expect *exp)
1588 {
1589 struct nf_conn *master = exp->master;
1590 long timeout = (exp->timeout.expires - jiffies) / HZ;
1591 struct nf_conn_help *help;
1592
1593 if (timeout < 0)
1594 timeout = 0;
1595
1596 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1597 goto nla_put_failure;
1598 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1599 goto nla_put_failure;
1600 if (ctnetlink_exp_dump_tuple(skb,
1601 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1602 CTA_EXPECT_MASTER) < 0)
1603 goto nla_put_failure;
1604
1605 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1606 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1607 NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1608 help = nfct_help(master);
1609 if (help) {
1610 struct nf_conntrack_helper *helper;
1611
1612 helper = rcu_dereference(help->helper);
1613 if (helper)
1614 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1615 }
1616
1617 return 0;
1618
1619 nla_put_failure:
1620 return -1;
1621 }
1622
1623 static int
1624 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1625 int event, const struct nf_conntrack_expect *exp)
1626 {
1627 struct nlmsghdr *nlh;
1628 struct nfgenmsg *nfmsg;
1629 unsigned int flags = pid ? NLM_F_MULTI : 0;
1630
1631 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1632 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1633 if (nlh == NULL)
1634 goto nlmsg_failure;
1635
1636 nfmsg = nlmsg_data(nlh);
1637 nfmsg->nfgen_family = exp->tuple.src.l3num;
1638 nfmsg->version = NFNETLINK_V0;
1639 nfmsg->res_id = 0;
1640
1641 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1642 goto nla_put_failure;
1643
1644 nlmsg_end(skb, nlh);
1645 return skb->len;
1646
1647 nlmsg_failure:
1648 nla_put_failure:
1649 nlmsg_cancel(skb, nlh);
1650 return -1;
1651 }
1652
1653 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1654 static int
1655 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1656 {
1657 struct nf_conntrack_expect *exp = item->exp;
1658 struct net *net = nf_ct_exp_net(exp);
1659 struct nlmsghdr *nlh;
1660 struct nfgenmsg *nfmsg;
1661 struct sk_buff *skb;
1662 unsigned int type, group;
1663 int flags = 0;
1664
1665 if (events & (1 << IPEXP_DESTROY)) {
1666 type = IPCTNL_MSG_EXP_DELETE;
1667 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1668 } else if (events & (1 << IPEXP_NEW)) {
1669 type = IPCTNL_MSG_EXP_NEW;
1670 flags = NLM_F_CREATE|NLM_F_EXCL;
1671 group = NFNLGRP_CONNTRACK_EXP_NEW;
1672 } else
1673 return 0;
1674
1675 if (!item->report && !nfnetlink_has_listeners(net, group))
1676 return 0;
1677
1678 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1679 if (skb == NULL)
1680 goto errout;
1681
1682 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1683 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1684 if (nlh == NULL)
1685 goto nlmsg_failure;
1686
1687 nfmsg = nlmsg_data(nlh);
1688 nfmsg->nfgen_family = exp->tuple.src.l3num;
1689 nfmsg->version = NFNETLINK_V0;
1690 nfmsg->res_id = 0;
1691
1692 rcu_read_lock();
1693 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1694 goto nla_put_failure;
1695 rcu_read_unlock();
1696
1697 nlmsg_end(skb, nlh);
1698 nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1699 return 0;
1700
1701 nla_put_failure:
1702 rcu_read_unlock();
1703 nlmsg_cancel(skb, nlh);
1704 nlmsg_failure:
1705 kfree_skb(skb);
1706 errout:
1707 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1708 return 0;
1709 }
1710 #endif
1711 static int ctnetlink_exp_done(struct netlink_callback *cb)
1712 {
1713 if (cb->args[1])
1714 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1715 return 0;
1716 }
1717
1718 static int
1719 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1720 {
1721 struct net *net = sock_net(skb->sk);
1722 struct nf_conntrack_expect *exp, *last;
1723 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1724 struct hlist_node *n;
1725 u_int8_t l3proto = nfmsg->nfgen_family;
1726
1727 rcu_read_lock();
1728 last = (struct nf_conntrack_expect *)cb->args[1];
1729 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1730 restart:
1731 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1732 hnode) {
1733 if (l3proto && exp->tuple.src.l3num != l3proto)
1734 continue;
1735 if (cb->args[1]) {
1736 if (exp != last)
1737 continue;
1738 cb->args[1] = 0;
1739 }
1740 if (ctnetlink_exp_fill_info(skb,
1741 NETLINK_CB(cb->skb).pid,
1742 cb->nlh->nlmsg_seq,
1743 IPCTNL_MSG_EXP_NEW,
1744 exp) < 0) {
1745 if (!atomic_inc_not_zero(&exp->use))
1746 continue;
1747 cb->args[1] = (unsigned long)exp;
1748 goto out;
1749 }
1750 }
1751 if (cb->args[1]) {
1752 cb->args[1] = 0;
1753 goto restart;
1754 }
1755 }
1756 out:
1757 rcu_read_unlock();
1758 if (last)
1759 nf_ct_expect_put(last);
1760
1761 return skb->len;
1762 }
1763
1764 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1765 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1766 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1767 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1768 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1769 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1770 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1771 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
1772 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
1773 };
1774
1775 static int
1776 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1777 const struct nlmsghdr *nlh,
1778 const struct nlattr * const cda[])
1779 {
1780 struct net *net = sock_net(ctnl);
1781 struct nf_conntrack_tuple tuple;
1782 struct nf_conntrack_expect *exp;
1783 struct sk_buff *skb2;
1784 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1785 u_int8_t u3 = nfmsg->nfgen_family;
1786 u16 zone;
1787 int err;
1788
1789 if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
1790 return netlink_dump_start(ctnl, skb, nlh,
1791 ctnetlink_exp_dump_table,
1792 ctnetlink_exp_done);
1793 }
1794
1795 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1796 if (err < 0)
1797 return err;
1798
1799 if (cda[CTA_EXPECT_MASTER])
1800 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1801 else
1802 return -EINVAL;
1803
1804 if (err < 0)
1805 return err;
1806
1807 exp = nf_ct_expect_find_get(net, zone, &tuple);
1808 if (!exp)
1809 return -ENOENT;
1810
1811 if (cda[CTA_EXPECT_ID]) {
1812 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1813 if (ntohl(id) != (u32)(unsigned long)exp) {
1814 nf_ct_expect_put(exp);
1815 return -ENOENT;
1816 }
1817 }
1818
1819 err = -ENOMEM;
1820 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1821 if (skb2 == NULL)
1822 goto out;
1823
1824 rcu_read_lock();
1825 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1826 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1827 rcu_read_unlock();
1828 if (err <= 0)
1829 goto free;
1830
1831 nf_ct_expect_put(exp);
1832
1833 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1834
1835 free:
1836 kfree_skb(skb2);
1837 out:
1838 nf_ct_expect_put(exp);
1839 return err;
1840 }
1841
1842 static int
1843 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1844 const struct nlmsghdr *nlh,
1845 const struct nlattr * const cda[])
1846 {
1847 struct net *net = sock_net(ctnl);
1848 struct nf_conntrack_expect *exp;
1849 struct nf_conntrack_tuple tuple;
1850 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1851 struct hlist_node *n, *next;
1852 u_int8_t u3 = nfmsg->nfgen_family;
1853 unsigned int i;
1854 u16 zone;
1855 int err;
1856
1857 if (cda[CTA_EXPECT_TUPLE]) {
1858 /* delete a single expect by tuple */
1859 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1860 if (err < 0)
1861 return err;
1862
1863 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1864 if (err < 0)
1865 return err;
1866
1867 /* bump usage count to 2 */
1868 exp = nf_ct_expect_find_get(net, zone, &tuple);
1869 if (!exp)
1870 return -ENOENT;
1871
1872 if (cda[CTA_EXPECT_ID]) {
1873 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1874 if (ntohl(id) != (u32)(unsigned long)exp) {
1875 nf_ct_expect_put(exp);
1876 return -ENOENT;
1877 }
1878 }
1879
1880 /* after list removal, usage count == 1 */
1881 spin_lock_bh(&nf_conntrack_lock);
1882 if (del_timer(&exp->timeout)) {
1883 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1884 nlmsg_report(nlh));
1885 nf_ct_expect_put(exp);
1886 }
1887 spin_unlock_bh(&nf_conntrack_lock);
1888 /* have to put what we 'get' above.
1889 * after this line usage count == 0 */
1890 nf_ct_expect_put(exp);
1891 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1892 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1893 struct nf_conn_help *m_help;
1894
1895 /* delete all expectations for this helper */
1896 spin_lock_bh(&nf_conntrack_lock);
1897 for (i = 0; i < nf_ct_expect_hsize; i++) {
1898 hlist_for_each_entry_safe(exp, n, next,
1899 &net->ct.expect_hash[i],
1900 hnode) {
1901 m_help = nfct_help(exp->master);
1902 if (!strcmp(m_help->helper->name, name) &&
1903 del_timer(&exp->timeout)) {
1904 nf_ct_unlink_expect_report(exp,
1905 NETLINK_CB(skb).pid,
1906 nlmsg_report(nlh));
1907 nf_ct_expect_put(exp);
1908 }
1909 }
1910 }
1911 spin_unlock_bh(&nf_conntrack_lock);
1912 } else {
1913 /* This basically means we have to flush everything*/
1914 spin_lock_bh(&nf_conntrack_lock);
1915 for (i = 0; i < nf_ct_expect_hsize; i++) {
1916 hlist_for_each_entry_safe(exp, n, next,
1917 &net->ct.expect_hash[i],
1918 hnode) {
1919 if (del_timer(&exp->timeout)) {
1920 nf_ct_unlink_expect_report(exp,
1921 NETLINK_CB(skb).pid,
1922 nlmsg_report(nlh));
1923 nf_ct_expect_put(exp);
1924 }
1925 }
1926 }
1927 spin_unlock_bh(&nf_conntrack_lock);
1928 }
1929
1930 return 0;
1931 }
1932 static int
1933 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1934 const struct nlattr * const cda[])
1935 {
1936 return -EOPNOTSUPP;
1937 }
1938
1939 static int
1940 ctnetlink_create_expect(struct net *net, u16 zone,
1941 const struct nlattr * const cda[],
1942 u_int8_t u3,
1943 u32 pid, int report)
1944 {
1945 struct nf_conntrack_tuple tuple, mask, master_tuple;
1946 struct nf_conntrack_tuple_hash *h = NULL;
1947 struct nf_conntrack_expect *exp;
1948 struct nf_conn *ct;
1949 struct nf_conn_help *help;
1950 int err = 0;
1951
1952 /* caller guarantees that those three CTA_EXPECT_* exist */
1953 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1954 if (err < 0)
1955 return err;
1956 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1957 if (err < 0)
1958 return err;
1959 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1960 if (err < 0)
1961 return err;
1962
1963 /* Look for master conntrack of this expectation */
1964 h = nf_conntrack_find_get(net, zone, &master_tuple);
1965 if (!h)
1966 return -ENOENT;
1967 ct = nf_ct_tuplehash_to_ctrack(h);
1968 exp = nf_ct_expect_alloc(ct);
1969 if (!exp) {
1970 err = -ENOMEM;
1971 goto out;
1972 }
1973 help = nfct_help(ct);
1974 if (!help) {
1975 if (!cda[CTA_EXPECT_TIMEOUT]) {
1976 err = -EINVAL;
1977 goto out;
1978 }
1979 exp->timeout.expires =
1980 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
1981
1982 exp->flags = NF_CT_EXPECT_USERSPACE;
1983 if (cda[CTA_EXPECT_FLAGS]) {
1984 exp->flags |=
1985 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
1986 }
1987 } else {
1988 if (cda[CTA_EXPECT_FLAGS]) {
1989 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
1990 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
1991 } else
1992 exp->flags = 0;
1993 }
1994
1995 exp->class = 0;
1996 exp->expectfn = NULL;
1997 exp->master = ct;
1998 exp->helper = NULL;
1999 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2000 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2001 exp->mask.src.u.all = mask.src.u.all;
2002
2003 err = nf_ct_expect_related_report(exp, pid, report);
2004 nf_ct_expect_put(exp);
2005
2006 out:
2007 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2008 return err;
2009 }
2010
2011 static int
2012 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2013 const struct nlmsghdr *nlh,
2014 const struct nlattr * const cda[])
2015 {
2016 struct net *net = sock_net(ctnl);
2017 struct nf_conntrack_tuple tuple;
2018 struct nf_conntrack_expect *exp;
2019 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2020 u_int8_t u3 = nfmsg->nfgen_family;
2021 u16 zone;
2022 int err;
2023
2024 if (!cda[CTA_EXPECT_TUPLE]
2025 || !cda[CTA_EXPECT_MASK]
2026 || !cda[CTA_EXPECT_MASTER])
2027 return -EINVAL;
2028
2029 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2030 if (err < 0)
2031 return err;
2032
2033 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2034 if (err < 0)
2035 return err;
2036
2037 spin_lock_bh(&nf_conntrack_lock);
2038 exp = __nf_ct_expect_find(net, zone, &tuple);
2039
2040 if (!exp) {
2041 spin_unlock_bh(&nf_conntrack_lock);
2042 err = -ENOENT;
2043 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2044 err = ctnetlink_create_expect(net, zone, cda,
2045 u3,
2046 NETLINK_CB(skb).pid,
2047 nlmsg_report(nlh));
2048 }
2049 return err;
2050 }
2051
2052 err = -EEXIST;
2053 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2054 err = ctnetlink_change_expect(exp, cda);
2055 spin_unlock_bh(&nf_conntrack_lock);
2056
2057 return err;
2058 }
2059
2060 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2061 static struct nf_ct_event_notifier ctnl_notifier = {
2062 .fcn = ctnetlink_conntrack_event,
2063 };
2064
2065 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2066 .fcn = ctnetlink_expect_event,
2067 };
2068 #endif
2069
2070 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2071 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2072 .attr_count = CTA_MAX,
2073 .policy = ct_nla_policy },
2074 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2075 .attr_count = CTA_MAX,
2076 .policy = ct_nla_policy },
2077 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2078 .attr_count = CTA_MAX,
2079 .policy = ct_nla_policy },
2080 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2081 .attr_count = CTA_MAX,
2082 .policy = ct_nla_policy },
2083 };
2084
2085 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2086 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2087 .attr_count = CTA_EXPECT_MAX,
2088 .policy = exp_nla_policy },
2089 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2090 .attr_count = CTA_EXPECT_MAX,
2091 .policy = exp_nla_policy },
2092 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2093 .attr_count = CTA_EXPECT_MAX,
2094 .policy = exp_nla_policy },
2095 };
2096
2097 static const struct nfnetlink_subsystem ctnl_subsys = {
2098 .name = "conntrack",
2099 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2100 .cb_count = IPCTNL_MSG_MAX,
2101 .cb = ctnl_cb,
2102 };
2103
2104 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2105 .name = "conntrack_expect",
2106 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2107 .cb_count = IPCTNL_MSG_EXP_MAX,
2108 .cb = ctnl_exp_cb,
2109 };
2110
2111 MODULE_ALIAS("ip_conntrack_netlink");
2112 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2113 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2114
2115 static int __init ctnetlink_init(void)
2116 {
2117 int ret;
2118
2119 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2120 ret = nfnetlink_subsys_register(&ctnl_subsys);
2121 if (ret < 0) {
2122 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2123 goto err_out;
2124 }
2125
2126 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2127 if (ret < 0) {
2128 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2129 goto err_unreg_subsys;
2130 }
2131
2132 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2133 ret = nf_conntrack_register_notifier(&ctnl_notifier);
2134 if (ret < 0) {
2135 pr_err("ctnetlink_init: cannot register notifier.\n");
2136 goto err_unreg_exp_subsys;
2137 }
2138
2139 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2140 if (ret < 0) {
2141 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2142 goto err_unreg_notifier;
2143 }
2144 #endif
2145
2146 return 0;
2147
2148 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2149 err_unreg_notifier:
2150 nf_conntrack_unregister_notifier(&ctnl_notifier);
2151 err_unreg_exp_subsys:
2152 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2153 #endif
2154 err_unreg_subsys:
2155 nfnetlink_subsys_unregister(&ctnl_subsys);
2156 err_out:
2157 return ret;
2158 }
2159
2160 static void __exit ctnetlink_exit(void)
2161 {
2162 pr_info("ctnetlink: unregistering from nfnetlink.\n");
2163
2164 nf_ct_remove_userspace_expectations();
2165 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2166 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2167 nf_conntrack_unregister_notifier(&ctnl_notifier);
2168 #endif
2169
2170 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2171 nfnetlink_subsys_unregister(&ctnl_subsys);
2172 }
2173
2174 module_init(ctnetlink_init);
2175 module_exit(ctnetlink_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree