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Merge branch 'sched/urgent'
[linux-2.6/x86.git] / net / netfilter / nf_conntrack_netlink.c
blob7dec88a1755b9fddcd1fb9d03c66fd54c396eac6
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 #include <net/netfilter/nf_conntrack_timestamp.h>
46 #ifdef CONFIG_NF_NAT_NEEDED
47 #include <net/netfilter/nf_nat_core.h>
48 #include <net/netfilter/nf_nat_protocol.h>
49 #endif
50
51 #include <linux/netfilter/nfnetlink.h>
52 #include <linux/netfilter/nfnetlink_conntrack.h>
53
54 MODULE_LICENSE("GPL");
55
56 static char __initdata version[] = "0.93";
57
58 static inline int
59 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
60 const struct nf_conntrack_tuple *tuple,
61 struct nf_conntrack_l4proto *l4proto)
62 {
63 int ret = 0;
64 struct nlattr *nest_parms;
65
66 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
67 if (!nest_parms)
68 goto nla_put_failure;
69 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
70
71 if (likely(l4proto->tuple_to_nlattr))
72 ret = l4proto->tuple_to_nlattr(skb, tuple);
73
74 nla_nest_end(skb, nest_parms);
75
76 return ret;
77
78 nla_put_failure:
79 return -1;
80 }
81
82 static inline int
83 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
84 const struct nf_conntrack_tuple *tuple,
85 struct nf_conntrack_l3proto *l3proto)
86 {
87 int ret = 0;
88 struct nlattr *nest_parms;
89
90 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
91 if (!nest_parms)
92 goto nla_put_failure;
93
94 if (likely(l3proto->tuple_to_nlattr))
95 ret = l3proto->tuple_to_nlattr(skb, tuple);
96
97 nla_nest_end(skb, nest_parms);
98
99 return ret;
100
101 nla_put_failure:
102 return -1;
103 }
104
105 static int
106 ctnetlink_dump_tuples(struct sk_buff *skb,
107 const struct nf_conntrack_tuple *tuple)
108 {
109 int ret;
110 struct nf_conntrack_l3proto *l3proto;
111 struct nf_conntrack_l4proto *l4proto;
112
113 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
114 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
115
116 if (unlikely(ret < 0))
117 return ret;
118
119 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
120 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
121
122 return ret;
123 }
124
125 static inline int
126 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
127 {
128 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
129 return 0;
130
131 nla_put_failure:
132 return -1;
133 }
134
135 static inline int
136 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
137 {
138 long timeout = (ct->timeout.expires - jiffies) / HZ;
139
140 if (timeout < 0)
141 timeout = 0;
142
143 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
144 return 0;
145
146 nla_put_failure:
147 return -1;
148 }
149
150 static inline int
151 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
152 {
153 struct nf_conntrack_l4proto *l4proto;
154 struct nlattr *nest_proto;
155 int ret;
156
157 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
158 if (!l4proto->to_nlattr)
159 return 0;
160
161 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
162 if (!nest_proto)
163 goto nla_put_failure;
164
165 ret = l4proto->to_nlattr(skb, nest_proto, ct);
166
167 nla_nest_end(skb, nest_proto);
168
169 return ret;
170
171 nla_put_failure:
172 return -1;
173 }
174
175 static inline int
176 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
177 {
178 struct nlattr *nest_helper;
179 const struct nf_conn_help *help = nfct_help(ct);
180 struct nf_conntrack_helper *helper;
181
182 if (!help)
183 return 0;
184
185 helper = rcu_dereference(help->helper);
186 if (!helper)
187 goto out;
188
189 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
190 if (!nest_helper)
191 goto nla_put_failure;
192 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
193
194 if (helper->to_nlattr)
195 helper->to_nlattr(skb, ct);
196
197 nla_nest_end(skb, nest_helper);
198 out:
199 return 0;
200
201 nla_put_failure:
202 return -1;
203 }
204
205 static int
206 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
207 enum ip_conntrack_dir dir)
208 {
209 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
210 struct nlattr *nest_count;
211 const struct nf_conn_counter *acct;
212
213 acct = nf_conn_acct_find(ct);
214 if (!acct)
215 return 0;
216
217 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
218 if (!nest_count)
219 goto nla_put_failure;
220
221 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
222 cpu_to_be64(acct[dir].packets));
223 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
224 cpu_to_be64(acct[dir].bytes));
225
226 nla_nest_end(skb, nest_count);
227
228 return 0;
229
230 nla_put_failure:
231 return -1;
232 }
233
234 static int
235 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
236 {
237 struct nlattr *nest_count;
238 const struct nf_conn_tstamp *tstamp;
239
240 tstamp = nf_conn_tstamp_find(ct);
241 if (!tstamp)
242 return 0;
243
244 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
245 if (!nest_count)
246 goto nla_put_failure;
247
248 NLA_PUT_BE64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start));
249 if (tstamp->stop != 0) {
250 NLA_PUT_BE64(skb, CTA_TIMESTAMP_STOP,
251 cpu_to_be64(tstamp->stop));
252 }
253 nla_nest_end(skb, nest_count);
254
255 return 0;
256
257 nla_put_failure:
258 return -1;
259 }
260
261 #ifdef CONFIG_NF_CONNTRACK_MARK
262 static inline int
263 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
264 {
265 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
266 return 0;
267
268 nla_put_failure:
269 return -1;
270 }
271 #else
272 #define ctnetlink_dump_mark(a, b) (0)
273 #endif
274
275 #ifdef CONFIG_NF_CONNTRACK_SECMARK
276 static inline int
277 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
278 {
279 struct nlattr *nest_secctx;
280 int len, ret;
281 char *secctx;
282
283 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
284 if (ret)
285 return 0;
286
287 ret = -1;
288 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
289 if (!nest_secctx)
290 goto nla_put_failure;
291
292 NLA_PUT_STRING(skb, CTA_SECCTX_NAME, secctx);
293 nla_nest_end(skb, nest_secctx);
294
295 ret = 0;
296 nla_put_failure:
297 security_release_secctx(secctx, len);
298 return ret;
299 }
300 #else
301 #define ctnetlink_dump_secctx(a, b) (0)
302 #endif
303
304 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
305
306 static inline int
307 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
308 {
309 struct nlattr *nest_parms;
310
311 if (!(ct->status & IPS_EXPECTED))
312 return 0;
313
314 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
315 if (!nest_parms)
316 goto nla_put_failure;
317 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
318 goto nla_put_failure;
319 nla_nest_end(skb, nest_parms);
320
321 return 0;
322
323 nla_put_failure:
324 return -1;
325 }
326
327 #ifdef CONFIG_NF_NAT_NEEDED
328 static int
329 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
330 {
331 struct nlattr *nest_parms;
332
333 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
334 if (!nest_parms)
335 goto nla_put_failure;
336
337 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
338 htonl(natseq->correction_pos));
339 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
340 htonl(natseq->offset_before));
341 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
342 htonl(natseq->offset_after));
343
344 nla_nest_end(skb, nest_parms);
345
346 return 0;
347
348 nla_put_failure:
349 return -1;
350 }
351
352 static inline int
353 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
354 {
355 struct nf_nat_seq *natseq;
356 struct nf_conn_nat *nat = nfct_nat(ct);
357
358 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
359 return 0;
360
361 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
362 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
363 return -1;
364
365 natseq = &nat->seq[IP_CT_DIR_REPLY];
366 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
367 return -1;
368
369 return 0;
370 }
371 #else
372 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
373 #endif
374
375 static inline int
376 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
377 {
378 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
379 return 0;
380
381 nla_put_failure:
382 return -1;
383 }
384
385 static inline int
386 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
387 {
388 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
389 return 0;
390
391 nla_put_failure:
392 return -1;
393 }
394
395 static int
396 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
397 int event, struct nf_conn *ct)
398 {
399 struct nlmsghdr *nlh;
400 struct nfgenmsg *nfmsg;
401 struct nlattr *nest_parms;
402 unsigned int flags = pid ? NLM_F_MULTI : 0;
403
404 event |= NFNL_SUBSYS_CTNETLINK << 8;
405 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
406 if (nlh == NULL)
407 goto nlmsg_failure;
408
409 nfmsg = nlmsg_data(nlh);
410 nfmsg->nfgen_family = nf_ct_l3num(ct);
411 nfmsg->version = NFNETLINK_V0;
412 nfmsg->res_id = 0;
413
414 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
415 if (!nest_parms)
416 goto nla_put_failure;
417 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
418 goto nla_put_failure;
419 nla_nest_end(skb, nest_parms);
420
421 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
422 if (!nest_parms)
423 goto nla_put_failure;
424 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
425 goto nla_put_failure;
426 nla_nest_end(skb, nest_parms);
427
428 if (nf_ct_zone(ct))
429 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
430
431 if (ctnetlink_dump_status(skb, ct) < 0 ||
432 ctnetlink_dump_timeout(skb, ct) < 0 ||
433 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
434 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
435 ctnetlink_dump_timestamp(skb, ct) < 0 ||
436 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
437 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
438 ctnetlink_dump_mark(skb, ct) < 0 ||
439 ctnetlink_dump_secctx(skb, ct) < 0 ||
440 ctnetlink_dump_id(skb, ct) < 0 ||
441 ctnetlink_dump_use(skb, ct) < 0 ||
442 ctnetlink_dump_master(skb, ct) < 0 ||
443 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
444 goto nla_put_failure;
445
446 nlmsg_end(skb, nlh);
447 return skb->len;
448
449 nlmsg_failure:
450 nla_put_failure:
451 nlmsg_cancel(skb, nlh);
452 return -1;
453 }
454
455 #ifdef CONFIG_NF_CONNTRACK_EVENTS
456 static inline size_t
457 ctnetlink_proto_size(const struct nf_conn *ct)
458 {
459 struct nf_conntrack_l3proto *l3proto;
460 struct nf_conntrack_l4proto *l4proto;
461 size_t len = 0;
462
463 rcu_read_lock();
464 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
465 len += l3proto->nla_size;
466
467 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
468 len += l4proto->nla_size;
469 rcu_read_unlock();
470
471 return len;
472 }
473
474 static inline size_t
475 ctnetlink_counters_size(const struct nf_conn *ct)
476 {
477 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
478 return 0;
479 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
480 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
481 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
482 ;
483 }
484
485 static inline int
486 ctnetlink_secctx_size(const struct nf_conn *ct)
487 {
488 #ifdef CONFIG_NF_CONNTRACK_SECMARK
489 int len, ret;
490
491 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
492 if (ret)
493 return 0;
494
495 return nla_total_size(0) /* CTA_SECCTX */
496 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
497 #else
498 return 0;
499 #endif
500 }
501
502 static inline size_t
503 ctnetlink_timestamp_size(const struct nf_conn *ct)
504 {
505 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
506 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
507 return 0;
508 return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
509 #else
510 return 0;
511 #endif
512 }
513
514 static inline size_t
515 ctnetlink_nlmsg_size(const struct nf_conn *ct)
516 {
517 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
518 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
519 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
520 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
521 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
522 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
523 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
524 + ctnetlink_counters_size(ct)
525 + ctnetlink_timestamp_size(ct)
526 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
527 + nla_total_size(0) /* CTA_PROTOINFO */
528 + nla_total_size(0) /* CTA_HELP */
529 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
530 + ctnetlink_secctx_size(ct)
531 #ifdef CONFIG_NF_NAT_NEEDED
532 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
533 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
534 #endif
535 #ifdef CONFIG_NF_CONNTRACK_MARK
536 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
537 #endif
538 + ctnetlink_proto_size(ct)
539 ;
540 }
541
542 static int
543 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
544 {
545 struct net *net;
546 struct nlmsghdr *nlh;
547 struct nfgenmsg *nfmsg;
548 struct nlattr *nest_parms;
549 struct nf_conn *ct = item->ct;
550 struct sk_buff *skb;
551 unsigned int type;
552 unsigned int flags = 0, group;
553 int err;
554
555 /* ignore our fake conntrack entry */
556 if (nf_ct_is_untracked(ct))
557 return 0;
558
559 if (events & (1 << IPCT_DESTROY)) {
560 type = IPCTNL_MSG_CT_DELETE;
561 group = NFNLGRP_CONNTRACK_DESTROY;
562 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
563 type = IPCTNL_MSG_CT_NEW;
564 flags = NLM_F_CREATE|NLM_F_EXCL;
565 group = NFNLGRP_CONNTRACK_NEW;
566 } else if (events) {
567 type = IPCTNL_MSG_CT_NEW;
568 group = NFNLGRP_CONNTRACK_UPDATE;
569 } else
570 return 0;
571
572 net = nf_ct_net(ct);
573 if (!item->report && !nfnetlink_has_listeners(net, group))
574 return 0;
575
576 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
577 if (skb == NULL)
578 goto errout;
579
580 type |= NFNL_SUBSYS_CTNETLINK << 8;
581 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
582 if (nlh == NULL)
583 goto nlmsg_failure;
584
585 nfmsg = nlmsg_data(nlh);
586 nfmsg->nfgen_family = nf_ct_l3num(ct);
587 nfmsg->version = NFNETLINK_V0;
588 nfmsg->res_id = 0;
589
590 rcu_read_lock();
591 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
592 if (!nest_parms)
593 goto nla_put_failure;
594 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
595 goto nla_put_failure;
596 nla_nest_end(skb, nest_parms);
597
598 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
599 if (!nest_parms)
600 goto nla_put_failure;
601 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
602 goto nla_put_failure;
603 nla_nest_end(skb, nest_parms);
604
605 if (nf_ct_zone(ct))
606 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
607
608 if (ctnetlink_dump_id(skb, ct) < 0)
609 goto nla_put_failure;
610
611 if (ctnetlink_dump_status(skb, ct) < 0)
612 goto nla_put_failure;
613
614 if (events & (1 << IPCT_DESTROY)) {
615 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
616 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
617 ctnetlink_dump_timestamp(skb, ct) < 0)
618 goto nla_put_failure;
619 } else {
620 if (ctnetlink_dump_timeout(skb, ct) < 0)
621 goto nla_put_failure;
622
623 if (events & (1 << IPCT_PROTOINFO)
624 && ctnetlink_dump_protoinfo(skb, ct) < 0)
625 goto nla_put_failure;
626
627 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
628 && ctnetlink_dump_helpinfo(skb, ct) < 0)
629 goto nla_put_failure;
630
631 #ifdef CONFIG_NF_CONNTRACK_SECMARK
632 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
633 && ctnetlink_dump_secctx(skb, ct) < 0)
634 goto nla_put_failure;
635 #endif
636
637 if (events & (1 << IPCT_RELATED) &&
638 ctnetlink_dump_master(skb, ct) < 0)
639 goto nla_put_failure;
640
641 if (events & (1 << IPCT_NATSEQADJ) &&
642 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
643 goto nla_put_failure;
644 }
645
646 #ifdef CONFIG_NF_CONNTRACK_MARK
647 if ((events & (1 << IPCT_MARK) || ct->mark)
648 && ctnetlink_dump_mark(skb, ct) < 0)
649 goto nla_put_failure;
650 #endif
651 rcu_read_unlock();
652
653 nlmsg_end(skb, nlh);
654 err = nfnetlink_send(skb, net, item->pid, group, item->report,
655 GFP_ATOMIC);
656 if (err == -ENOBUFS || err == -EAGAIN)
657 return -ENOBUFS;
658
659 return 0;
660
661 nla_put_failure:
662 rcu_read_unlock();
663 nlmsg_cancel(skb, nlh);
664 nlmsg_failure:
665 kfree_skb(skb);
666 errout:
667 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
668 return -ENOBUFS;
669
670 return 0;
671 }
672 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
673
674 static int ctnetlink_done(struct netlink_callback *cb)
675 {
676 if (cb->args[1])
677 nf_ct_put((struct nf_conn *)cb->args[1]);
678 return 0;
679 }
680
681 static int
682 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
683 {
684 struct net *net = sock_net(skb->sk);
685 struct nf_conn *ct, *last;
686 struct nf_conntrack_tuple_hash *h;
687 struct hlist_nulls_node *n;
688 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
689 u_int8_t l3proto = nfmsg->nfgen_family;
690
691 spin_lock_bh(&nf_conntrack_lock);
692 last = (struct nf_conn *)cb->args[1];
693 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
694 restart:
695 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
696 hnnode) {
697 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
698 continue;
699 ct = nf_ct_tuplehash_to_ctrack(h);
700 /* Dump entries of a given L3 protocol number.
701 * If it is not specified, ie. l3proto == 0,
702 * then dump everything. */
703 if (l3proto && nf_ct_l3num(ct) != l3proto)
704 continue;
705 if (cb->args[1]) {
706 if (ct != last)
707 continue;
708 cb->args[1] = 0;
709 }
710 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
711 cb->nlh->nlmsg_seq,
712 IPCTNL_MSG_CT_NEW, ct) < 0) {
713 nf_conntrack_get(&ct->ct_general);
714 cb->args[1] = (unsigned long)ct;
715 goto out;
716 }
717
718 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
719 IPCTNL_MSG_CT_GET_CTRZERO) {
720 struct nf_conn_counter *acct;
721
722 acct = nf_conn_acct_find(ct);
723 if (acct)
724 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
725 }
726 }
727 if (cb->args[1]) {
728 cb->args[1] = 0;
729 goto restart;
730 }
731 }
732 out:
733 spin_unlock_bh(&nf_conntrack_lock);
734 if (last)
735 nf_ct_put(last);
736
737 return skb->len;
738 }
739
740 static inline int
741 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
742 {
743 struct nlattr *tb[CTA_IP_MAX+1];
744 struct nf_conntrack_l3proto *l3proto;
745 int ret = 0;
746
747 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
748
749 rcu_read_lock();
750 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
751
752 if (likely(l3proto->nlattr_to_tuple)) {
753 ret = nla_validate_nested(attr, CTA_IP_MAX,
754 l3proto->nla_policy);
755 if (ret == 0)
756 ret = l3proto->nlattr_to_tuple(tb, tuple);
757 }
758
759 rcu_read_unlock();
760
761 return ret;
762 }
763
764 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
765 [CTA_PROTO_NUM] = { .type = NLA_U8 },
766 };
767
768 static inline int
769 ctnetlink_parse_tuple_proto(struct nlattr *attr,
770 struct nf_conntrack_tuple *tuple)
771 {
772 struct nlattr *tb[CTA_PROTO_MAX+1];
773 struct nf_conntrack_l4proto *l4proto;
774 int ret = 0;
775
776 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
777 if (ret < 0)
778 return ret;
779
780 if (!tb[CTA_PROTO_NUM])
781 return -EINVAL;
782 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
783
784 rcu_read_lock();
785 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
786
787 if (likely(l4proto->nlattr_to_tuple)) {
788 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
789 l4proto->nla_policy);
790 if (ret == 0)
791 ret = l4proto->nlattr_to_tuple(tb, tuple);
792 }
793
794 rcu_read_unlock();
795
796 return ret;
797 }
798
799 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
800 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
801 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
802 };
803
804 static int
805 ctnetlink_parse_tuple(const struct nlattr * const cda[],
806 struct nf_conntrack_tuple *tuple,
807 enum ctattr_type type, u_int8_t l3num)
808 {
809 struct nlattr *tb[CTA_TUPLE_MAX+1];
810 int err;
811
812 memset(tuple, 0, sizeof(*tuple));
813
814 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
815
816 if (!tb[CTA_TUPLE_IP])
817 return -EINVAL;
818
819 tuple->src.l3num = l3num;
820
821 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
822 if (err < 0)
823 return err;
824
825 if (!tb[CTA_TUPLE_PROTO])
826 return -EINVAL;
827
828 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
829 if (err < 0)
830 return err;
831
832 /* orig and expect tuples get DIR_ORIGINAL */
833 if (type == CTA_TUPLE_REPLY)
834 tuple->dst.dir = IP_CT_DIR_REPLY;
835 else
836 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
837
838 return 0;
839 }
840
841 static int
842 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
843 {
844 if (attr)
845 #ifdef CONFIG_NF_CONNTRACK_ZONES
846 *zone = ntohs(nla_get_be16(attr));
847 #else
848 return -EOPNOTSUPP;
849 #endif
850 else
851 *zone = 0;
852
853 return 0;
854 }
855
856 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
857 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
858 };
859
860 static inline int
861 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
862 {
863 struct nlattr *tb[CTA_HELP_MAX+1];
864
865 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
866
867 if (!tb[CTA_HELP_NAME])
868 return -EINVAL;
869
870 *helper_name = nla_data(tb[CTA_HELP_NAME]);
871
872 return 0;
873 }
874
875 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
876 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
877 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
878 [CTA_STATUS] = { .type = NLA_U32 },
879 [CTA_PROTOINFO] = { .type = NLA_NESTED },
880 [CTA_HELP] = { .type = NLA_NESTED },
881 [CTA_NAT_SRC] = { .type = NLA_NESTED },
882 [CTA_TIMEOUT] = { .type = NLA_U32 },
883 [CTA_MARK] = { .type = NLA_U32 },
884 [CTA_ID] = { .type = NLA_U32 },
885 [CTA_NAT_DST] = { .type = NLA_NESTED },
886 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
887 [CTA_ZONE] = { .type = NLA_U16 },
888 };
889
890 static int
891 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
892 const struct nlmsghdr *nlh,
893 const struct nlattr * const cda[])
894 {
895 struct net *net = sock_net(ctnl);
896 struct nf_conntrack_tuple_hash *h;
897 struct nf_conntrack_tuple tuple;
898 struct nf_conn *ct;
899 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
900 u_int8_t u3 = nfmsg->nfgen_family;
901 u16 zone;
902 int err;
903
904 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
905 if (err < 0)
906 return err;
907
908 if (cda[CTA_TUPLE_ORIG])
909 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
910 else if (cda[CTA_TUPLE_REPLY])
911 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
912 else {
913 /* Flush the whole table */
914 nf_conntrack_flush_report(net,
915 NETLINK_CB(skb).pid,
916 nlmsg_report(nlh));
917 return 0;
918 }
919
920 if (err < 0)
921 return err;
922
923 h = nf_conntrack_find_get(net, zone, &tuple);
924 if (!h)
925 return -ENOENT;
926
927 ct = nf_ct_tuplehash_to_ctrack(h);
928
929 if (cda[CTA_ID]) {
930 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
931 if (id != (u32)(unsigned long)ct) {
932 nf_ct_put(ct);
933 return -ENOENT;
934 }
935 }
936
937 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
938 NETLINK_CB(skb).pid,
939 nlmsg_report(nlh)) < 0) {
940 nf_ct_delete_from_lists(ct);
941 /* we failed to report the event, try later */
942 nf_ct_insert_dying_list(ct);
943 nf_ct_put(ct);
944 return 0;
945 }
946
947 /* death_by_timeout would report the event again */
948 set_bit(IPS_DYING_BIT, &ct->status);
949
950 nf_ct_kill(ct);
951 nf_ct_put(ct);
952
953 return 0;
954 }
955
956 static int
957 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
958 const struct nlmsghdr *nlh,
959 const struct nlattr * const cda[])
960 {
961 struct net *net = sock_net(ctnl);
962 struct nf_conntrack_tuple_hash *h;
963 struct nf_conntrack_tuple tuple;
964 struct nf_conn *ct;
965 struct sk_buff *skb2 = NULL;
966 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
967 u_int8_t u3 = nfmsg->nfgen_family;
968 u16 zone;
969 int err;
970
971 if (nlh->nlmsg_flags & NLM_F_DUMP)
972 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
973 ctnetlink_done, 0);
974
975 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
976 if (err < 0)
977 return err;
978
979 if (cda[CTA_TUPLE_ORIG])
980 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
981 else if (cda[CTA_TUPLE_REPLY])
982 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
983 else
984 return -EINVAL;
985
986 if (err < 0)
987 return err;
988
989 h = nf_conntrack_find_get(net, zone, &tuple);
990 if (!h)
991 return -ENOENT;
992
993 ct = nf_ct_tuplehash_to_ctrack(h);
994
995 err = -ENOMEM;
996 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
997 if (skb2 == NULL) {
998 nf_ct_put(ct);
999 return -ENOMEM;
1000 }
1001
1002 rcu_read_lock();
1003 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
1004 IPCTNL_MSG_CT_NEW, ct);
1005 rcu_read_unlock();
1006 nf_ct_put(ct);
1007 if (err <= 0)
1008 goto free;
1009
1010 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1011 if (err < 0)
1012 goto out;
1013
1014 return 0;
1015
1016 free:
1017 kfree_skb(skb2);
1018 out:
1019 /* this avoids a loop in nfnetlink. */
1020 return err == -EAGAIN ? -ENOBUFS : err;
1021 }
1022
1023 #ifdef CONFIG_NF_NAT_NEEDED
1024 static int
1025 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1026 enum nf_nat_manip_type manip,
1027 const struct nlattr *attr)
1028 {
1029 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1030
1031 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1032 if (!parse_nat_setup) {
1033 #ifdef CONFIG_MODULES
1034 rcu_read_unlock();
1035 spin_unlock_bh(&nf_conntrack_lock);
1036 nfnl_unlock();
1037 if (request_module("nf-nat-ipv4") < 0) {
1038 nfnl_lock();
1039 spin_lock_bh(&nf_conntrack_lock);
1040 rcu_read_lock();
1041 return -EOPNOTSUPP;
1042 }
1043 nfnl_lock();
1044 spin_lock_bh(&nf_conntrack_lock);
1045 rcu_read_lock();
1046 if (nfnetlink_parse_nat_setup_hook)
1047 return -EAGAIN;
1048 #endif
1049 return -EOPNOTSUPP;
1050 }
1051
1052 return parse_nat_setup(ct, manip, attr);
1053 }
1054 #endif
1055
1056 static int
1057 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1058 {
1059 unsigned long d;
1060 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1061 d = ct->status ^ status;
1062
1063 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1064 /* unchangeable */
1065 return -EBUSY;
1066
1067 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1068 /* SEEN_REPLY bit can only be set */
1069 return -EBUSY;
1070
1071 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1072 /* ASSURED bit can only be set */
1073 return -EBUSY;
1074
1075 /* Be careful here, modifying NAT bits can screw up things,
1076 * so don't let users modify them directly if they don't pass
1077 * nf_nat_range. */
1078 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1079 return 0;
1080 }
1081
1082 static int
1083 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1084 {
1085 #ifdef CONFIG_NF_NAT_NEEDED
1086 int ret;
1087
1088 if (cda[CTA_NAT_DST]) {
1089 ret = ctnetlink_parse_nat_setup(ct,
1090 IP_NAT_MANIP_DST,
1091 cda[CTA_NAT_DST]);
1092 if (ret < 0)
1093 return ret;
1094 }
1095 if (cda[CTA_NAT_SRC]) {
1096 ret = ctnetlink_parse_nat_setup(ct,
1097 IP_NAT_MANIP_SRC,
1098 cda[CTA_NAT_SRC]);
1099 if (ret < 0)
1100 return ret;
1101 }
1102 return 0;
1103 #else
1104 return -EOPNOTSUPP;
1105 #endif
1106 }
1107
1108 static inline int
1109 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1110 {
1111 struct nf_conntrack_helper *helper;
1112 struct nf_conn_help *help = nfct_help(ct);
1113 char *helpname = NULL;
1114 int err;
1115
1116 /* don't change helper of sibling connections */
1117 if (ct->master)
1118 return -EBUSY;
1119
1120 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1121 if (err < 0)
1122 return err;
1123
1124 if (!strcmp(helpname, "")) {
1125 if (help && help->helper) {
1126 /* we had a helper before ... */
1127 nf_ct_remove_expectations(ct);
1128 rcu_assign_pointer(help->helper, NULL);
1129 }
1130
1131 return 0;
1132 }
1133
1134 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1135 nf_ct_protonum(ct));
1136 if (helper == NULL) {
1137 #ifdef CONFIG_MODULES
1138 spin_unlock_bh(&nf_conntrack_lock);
1139
1140 if (request_module("nfct-helper-%s", helpname) < 0) {
1141 spin_lock_bh(&nf_conntrack_lock);
1142 return -EOPNOTSUPP;
1143 }
1144
1145 spin_lock_bh(&nf_conntrack_lock);
1146 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1147 nf_ct_protonum(ct));
1148 if (helper)
1149 return -EAGAIN;
1150 #endif
1151 return -EOPNOTSUPP;
1152 }
1153
1154 if (help) {
1155 if (help->helper == helper)
1156 return 0;
1157 if (help->helper)
1158 return -EBUSY;
1159 /* need to zero data of old helper */
1160 memset(&help->help, 0, sizeof(help->help));
1161 } else {
1162 /* we cannot set a helper for an existing conntrack */
1163 return -EOPNOTSUPP;
1164 }
1165
1166 rcu_assign_pointer(help->helper, helper);
1167
1168 return 0;
1169 }
1170
1171 static inline int
1172 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1173 {
1174 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1175
1176 if (!del_timer(&ct->timeout))
1177 return -ETIME;
1178
1179 ct->timeout.expires = jiffies + timeout * HZ;
1180 add_timer(&ct->timeout);
1181
1182 return 0;
1183 }
1184
1185 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1186 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1187 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1188 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1189 };
1190
1191 static inline int
1192 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1193 {
1194 const struct nlattr *attr = cda[CTA_PROTOINFO];
1195 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1196 struct nf_conntrack_l4proto *l4proto;
1197 int err = 0;
1198
1199 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1200
1201 rcu_read_lock();
1202 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1203 if (l4proto->from_nlattr)
1204 err = l4proto->from_nlattr(tb, ct);
1205 rcu_read_unlock();
1206
1207 return err;
1208 }
1209
1210 #ifdef CONFIG_NF_NAT_NEEDED
1211 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1212 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1213 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1214 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1215 };
1216
1217 static inline int
1218 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1219 {
1220 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1221
1222 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1223
1224 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1225 return -EINVAL;
1226
1227 natseq->correction_pos =
1228 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1229
1230 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1231 return -EINVAL;
1232
1233 natseq->offset_before =
1234 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1235
1236 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1237 return -EINVAL;
1238
1239 natseq->offset_after =
1240 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1241
1242 return 0;
1243 }
1244
1245 static int
1246 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1247 const struct nlattr * const cda[])
1248 {
1249 int ret = 0;
1250 struct nf_conn_nat *nat = nfct_nat(ct);
1251
1252 if (!nat)
1253 return 0;
1254
1255 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1256 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1257 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1258 if (ret < 0)
1259 return ret;
1260
1261 ct->status |= IPS_SEQ_ADJUST;
1262 }
1263
1264 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1265 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1266 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1267 if (ret < 0)
1268 return ret;
1269
1270 ct->status |= IPS_SEQ_ADJUST;
1271 }
1272
1273 return 0;
1274 }
1275 #endif
1276
1277 static int
1278 ctnetlink_change_conntrack(struct nf_conn *ct,
1279 const struct nlattr * const cda[])
1280 {
1281 int err;
1282
1283 /* only allow NAT changes and master assignation for new conntracks */
1284 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1285 return -EOPNOTSUPP;
1286
1287 if (cda[CTA_HELP]) {
1288 err = ctnetlink_change_helper(ct, cda);
1289 if (err < 0)
1290 return err;
1291 }
1292
1293 if (cda[CTA_TIMEOUT]) {
1294 err = ctnetlink_change_timeout(ct, cda);
1295 if (err < 0)
1296 return err;
1297 }
1298
1299 if (cda[CTA_STATUS]) {
1300 err = ctnetlink_change_status(ct, cda);
1301 if (err < 0)
1302 return err;
1303 }
1304
1305 if (cda[CTA_PROTOINFO]) {
1306 err = ctnetlink_change_protoinfo(ct, cda);
1307 if (err < 0)
1308 return err;
1309 }
1310
1311 #if defined(CONFIG_NF_CONNTRACK_MARK)
1312 if (cda[CTA_MARK])
1313 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1314 #endif
1315
1316 #ifdef CONFIG_NF_NAT_NEEDED
1317 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1318 err = ctnetlink_change_nat_seq_adj(ct, cda);
1319 if (err < 0)
1320 return err;
1321 }
1322 #endif
1323
1324 return 0;
1325 }
1326
1327 static struct nf_conn *
1328 ctnetlink_create_conntrack(struct net *net, u16 zone,
1329 const struct nlattr * const cda[],
1330 struct nf_conntrack_tuple *otuple,
1331 struct nf_conntrack_tuple *rtuple,
1332 u8 u3)
1333 {
1334 struct nf_conn *ct;
1335 int err = -EINVAL;
1336 struct nf_conntrack_helper *helper;
1337 struct nf_conn_tstamp *tstamp;
1338
1339 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1340 if (IS_ERR(ct))
1341 return ERR_PTR(-ENOMEM);
1342
1343 if (!cda[CTA_TIMEOUT])
1344 goto err1;
1345 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1346
1347 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1348
1349 rcu_read_lock();
1350 if (cda[CTA_HELP]) {
1351 char *helpname = NULL;
1352
1353 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1354 if (err < 0)
1355 goto err2;
1356
1357 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1358 nf_ct_protonum(ct));
1359 if (helper == NULL) {
1360 rcu_read_unlock();
1361 #ifdef CONFIG_MODULES
1362 if (request_module("nfct-helper-%s", helpname) < 0) {
1363 err = -EOPNOTSUPP;
1364 goto err1;
1365 }
1366
1367 rcu_read_lock();
1368 helper = __nf_conntrack_helper_find(helpname,
1369 nf_ct_l3num(ct),
1370 nf_ct_protonum(ct));
1371 if (helper) {
1372 err = -EAGAIN;
1373 goto err2;
1374 }
1375 rcu_read_unlock();
1376 #endif
1377 err = -EOPNOTSUPP;
1378 goto err1;
1379 } else {
1380 struct nf_conn_help *help;
1381
1382 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1383 if (help == NULL) {
1384 err = -ENOMEM;
1385 goto err2;
1386 }
1387
1388 /* not in hash table yet so not strictly necessary */
1389 rcu_assign_pointer(help->helper, helper);
1390 }
1391 } else {
1392 /* try an implicit helper assignation */
1393 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1394 if (err < 0)
1395 goto err2;
1396 }
1397
1398 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1399 err = ctnetlink_change_nat(ct, cda);
1400 if (err < 0)
1401 goto err2;
1402 }
1403
1404 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1405 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1406 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1407 /* we must add conntrack extensions before confirmation. */
1408 ct->status |= IPS_CONFIRMED;
1409
1410 if (cda[CTA_STATUS]) {
1411 err = ctnetlink_change_status(ct, cda);
1412 if (err < 0)
1413 goto err2;
1414 }
1415
1416 #ifdef CONFIG_NF_NAT_NEEDED
1417 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1418 err = ctnetlink_change_nat_seq_adj(ct, cda);
1419 if (err < 0)
1420 goto err2;
1421 }
1422 #endif
1423
1424 memset(&ct->proto, 0, sizeof(ct->proto));
1425 if (cda[CTA_PROTOINFO]) {
1426 err = ctnetlink_change_protoinfo(ct, cda);
1427 if (err < 0)
1428 goto err2;
1429 }
1430
1431 #if defined(CONFIG_NF_CONNTRACK_MARK)
1432 if (cda[CTA_MARK])
1433 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1434 #endif
1435
1436 /* setup master conntrack: this is a confirmed expectation */
1437 if (cda[CTA_TUPLE_MASTER]) {
1438 struct nf_conntrack_tuple master;
1439 struct nf_conntrack_tuple_hash *master_h;
1440 struct nf_conn *master_ct;
1441
1442 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1443 if (err < 0)
1444 goto err2;
1445
1446 master_h = nf_conntrack_find_get(net, zone, &master);
1447 if (master_h == NULL) {
1448 err = -ENOENT;
1449 goto err2;
1450 }
1451 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1452 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1453 ct->master = master_ct;
1454 }
1455 tstamp = nf_conn_tstamp_find(ct);
1456 if (tstamp)
1457 tstamp->start = ktime_to_ns(ktime_get_real());
1458
1459 add_timer(&ct->timeout);
1460 nf_conntrack_hash_insert(ct);
1461 rcu_read_unlock();
1462
1463 return ct;
1464
1465 err2:
1466 rcu_read_unlock();
1467 err1:
1468 nf_conntrack_free(ct);
1469 return ERR_PTR(err);
1470 }
1471
1472 static int
1473 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1474 const struct nlmsghdr *nlh,
1475 const struct nlattr * const cda[])
1476 {
1477 struct net *net = sock_net(ctnl);
1478 struct nf_conntrack_tuple otuple, rtuple;
1479 struct nf_conntrack_tuple_hash *h = NULL;
1480 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1481 u_int8_t u3 = nfmsg->nfgen_family;
1482 u16 zone;
1483 int err;
1484
1485 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1486 if (err < 0)
1487 return err;
1488
1489 if (cda[CTA_TUPLE_ORIG]) {
1490 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1491 if (err < 0)
1492 return err;
1493 }
1494
1495 if (cda[CTA_TUPLE_REPLY]) {
1496 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1497 if (err < 0)
1498 return err;
1499 }
1500
1501 spin_lock_bh(&nf_conntrack_lock);
1502 if (cda[CTA_TUPLE_ORIG])
1503 h = __nf_conntrack_find(net, zone, &otuple);
1504 else if (cda[CTA_TUPLE_REPLY])
1505 h = __nf_conntrack_find(net, zone, &rtuple);
1506
1507 if (h == NULL) {
1508 err = -ENOENT;
1509 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1510 struct nf_conn *ct;
1511 enum ip_conntrack_events events;
1512
1513 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1514 &rtuple, u3);
1515 if (IS_ERR(ct)) {
1516 err = PTR_ERR(ct);
1517 goto out_unlock;
1518 }
1519 err = 0;
1520 nf_conntrack_get(&ct->ct_general);
1521 spin_unlock_bh(&nf_conntrack_lock);
1522 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1523 events = IPCT_RELATED;
1524 else
1525 events = IPCT_NEW;
1526
1527 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1528 (1 << IPCT_ASSURED) |
1529 (1 << IPCT_HELPER) |
1530 (1 << IPCT_PROTOINFO) |
1531 (1 << IPCT_NATSEQADJ) |
1532 (1 << IPCT_MARK) | events,
1533 ct, NETLINK_CB(skb).pid,
1534 nlmsg_report(nlh));
1535 nf_ct_put(ct);
1536 } else
1537 spin_unlock_bh(&nf_conntrack_lock);
1538
1539 return err;
1540 }
1541 /* implicit 'else' */
1542
1543 /* We manipulate the conntrack inside the global conntrack table lock,
1544 * so there's no need to increase the refcount */
1545 err = -EEXIST;
1546 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1547 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1548
1549 err = ctnetlink_change_conntrack(ct, cda);
1550 if (err == 0) {
1551 nf_conntrack_get(&ct->ct_general);
1552 spin_unlock_bh(&nf_conntrack_lock);
1553 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1554 (1 << IPCT_ASSURED) |
1555 (1 << IPCT_HELPER) |
1556 (1 << IPCT_PROTOINFO) |
1557 (1 << IPCT_NATSEQADJ) |
1558 (1 << IPCT_MARK),
1559 ct, NETLINK_CB(skb).pid,
1560 nlmsg_report(nlh));
1561 nf_ct_put(ct);
1562 } else
1563 spin_unlock_bh(&nf_conntrack_lock);
1564
1565 return err;
1566 }
1567
1568 out_unlock:
1569 spin_unlock_bh(&nf_conntrack_lock);
1570 return err;
1571 }
1572
1573 /***********************************************************************
1574 * EXPECT
1575 ***********************************************************************/
1576
1577 static inline int
1578 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1579 const struct nf_conntrack_tuple *tuple,
1580 enum ctattr_expect type)
1581 {
1582 struct nlattr *nest_parms;
1583
1584 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1585 if (!nest_parms)
1586 goto nla_put_failure;
1587 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1588 goto nla_put_failure;
1589 nla_nest_end(skb, nest_parms);
1590
1591 return 0;
1592
1593 nla_put_failure:
1594 return -1;
1595 }
1596
1597 static inline int
1598 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1599 const struct nf_conntrack_tuple *tuple,
1600 const struct nf_conntrack_tuple_mask *mask)
1601 {
1602 int ret;
1603 struct nf_conntrack_l3proto *l3proto;
1604 struct nf_conntrack_l4proto *l4proto;
1605 struct nf_conntrack_tuple m;
1606 struct nlattr *nest_parms;
1607
1608 memset(&m, 0xFF, sizeof(m));
1609 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1610 m.src.u.all = mask->src.u.all;
1611 m.dst.protonum = tuple->dst.protonum;
1612
1613 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1614 if (!nest_parms)
1615 goto nla_put_failure;
1616
1617 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1618 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1619
1620 if (unlikely(ret < 0))
1621 goto nla_put_failure;
1622
1623 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1624 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1625 if (unlikely(ret < 0))
1626 goto nla_put_failure;
1627
1628 nla_nest_end(skb, nest_parms);
1629
1630 return 0;
1631
1632 nla_put_failure:
1633 return -1;
1634 }
1635
1636 static int
1637 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1638 const struct nf_conntrack_expect *exp)
1639 {
1640 struct nf_conn *master = exp->master;
1641 long timeout = (exp->timeout.expires - jiffies) / HZ;
1642 struct nf_conn_help *help;
1643
1644 if (timeout < 0)
1645 timeout = 0;
1646
1647 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1648 goto nla_put_failure;
1649 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1650 goto nla_put_failure;
1651 if (ctnetlink_exp_dump_tuple(skb,
1652 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1653 CTA_EXPECT_MASTER) < 0)
1654 goto nla_put_failure;
1655
1656 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1657 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1658 NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1659 help = nfct_help(master);
1660 if (help) {
1661 struct nf_conntrack_helper *helper;
1662
1663 helper = rcu_dereference(help->helper);
1664 if (helper)
1665 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1666 }
1667
1668 return 0;
1669
1670 nla_put_failure:
1671 return -1;
1672 }
1673
1674 static int
1675 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1676 int event, const struct nf_conntrack_expect *exp)
1677 {
1678 struct nlmsghdr *nlh;
1679 struct nfgenmsg *nfmsg;
1680 unsigned int flags = pid ? NLM_F_MULTI : 0;
1681
1682 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1683 nlh = nlmsg_put(skb, pid, seq, event, 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 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1693 goto nla_put_failure;
1694
1695 nlmsg_end(skb, nlh);
1696 return skb->len;
1697
1698 nlmsg_failure:
1699 nla_put_failure:
1700 nlmsg_cancel(skb, nlh);
1701 return -1;
1702 }
1703
1704 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1705 static int
1706 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1707 {
1708 struct nf_conntrack_expect *exp = item->exp;
1709 struct net *net = nf_ct_exp_net(exp);
1710 struct nlmsghdr *nlh;
1711 struct nfgenmsg *nfmsg;
1712 struct sk_buff *skb;
1713 unsigned int type, group;
1714 int flags = 0;
1715
1716 if (events & (1 << IPEXP_DESTROY)) {
1717 type = IPCTNL_MSG_EXP_DELETE;
1718 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1719 } else if (events & (1 << IPEXP_NEW)) {
1720 type = IPCTNL_MSG_EXP_NEW;
1721 flags = NLM_F_CREATE|NLM_F_EXCL;
1722 group = NFNLGRP_CONNTRACK_EXP_NEW;
1723 } else
1724 return 0;
1725
1726 if (!item->report && !nfnetlink_has_listeners(net, group))
1727 return 0;
1728
1729 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1730 if (skb == NULL)
1731 goto errout;
1732
1733 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1734 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1735 if (nlh == NULL)
1736 goto nlmsg_failure;
1737
1738 nfmsg = nlmsg_data(nlh);
1739 nfmsg->nfgen_family = exp->tuple.src.l3num;
1740 nfmsg->version = NFNETLINK_V0;
1741 nfmsg->res_id = 0;
1742
1743 rcu_read_lock();
1744 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1745 goto nla_put_failure;
1746 rcu_read_unlock();
1747
1748 nlmsg_end(skb, nlh);
1749 nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1750 return 0;
1751
1752 nla_put_failure:
1753 rcu_read_unlock();
1754 nlmsg_cancel(skb, nlh);
1755 nlmsg_failure:
1756 kfree_skb(skb);
1757 errout:
1758 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1759 return 0;
1760 }
1761 #endif
1762 static int ctnetlink_exp_done(struct netlink_callback *cb)
1763 {
1764 if (cb->args[1])
1765 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1766 return 0;
1767 }
1768
1769 static int
1770 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1771 {
1772 struct net *net = sock_net(skb->sk);
1773 struct nf_conntrack_expect *exp, *last;
1774 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1775 struct hlist_node *n;
1776 u_int8_t l3proto = nfmsg->nfgen_family;
1777
1778 rcu_read_lock();
1779 last = (struct nf_conntrack_expect *)cb->args[1];
1780 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1781 restart:
1782 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1783 hnode) {
1784 if (l3proto && exp->tuple.src.l3num != l3proto)
1785 continue;
1786 if (cb->args[1]) {
1787 if (exp != last)
1788 continue;
1789 cb->args[1] = 0;
1790 }
1791 if (ctnetlink_exp_fill_info(skb,
1792 NETLINK_CB(cb->skb).pid,
1793 cb->nlh->nlmsg_seq,
1794 IPCTNL_MSG_EXP_NEW,
1795 exp) < 0) {
1796 if (!atomic_inc_not_zero(&exp->use))
1797 continue;
1798 cb->args[1] = (unsigned long)exp;
1799 goto out;
1800 }
1801 }
1802 if (cb->args[1]) {
1803 cb->args[1] = 0;
1804 goto restart;
1805 }
1806 }
1807 out:
1808 rcu_read_unlock();
1809 if (last)
1810 nf_ct_expect_put(last);
1811
1812 return skb->len;
1813 }
1814
1815 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1816 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1817 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1818 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1819 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1820 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1821 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1822 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
1823 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
1824 };
1825
1826 static int
1827 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1828 const struct nlmsghdr *nlh,
1829 const struct nlattr * const cda[])
1830 {
1831 struct net *net = sock_net(ctnl);
1832 struct nf_conntrack_tuple tuple;
1833 struct nf_conntrack_expect *exp;
1834 struct sk_buff *skb2;
1835 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1836 u_int8_t u3 = nfmsg->nfgen_family;
1837 u16 zone;
1838 int err;
1839
1840 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1841 return netlink_dump_start(ctnl, skb, nlh,
1842 ctnetlink_exp_dump_table,
1843 ctnetlink_exp_done, 0);
1844 }
1845
1846 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1847 if (err < 0)
1848 return err;
1849
1850 if (cda[CTA_EXPECT_MASTER])
1851 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1852 else
1853 return -EINVAL;
1854
1855 if (err < 0)
1856 return err;
1857
1858 exp = nf_ct_expect_find_get(net, zone, &tuple);
1859 if (!exp)
1860 return -ENOENT;
1861
1862 if (cda[CTA_EXPECT_ID]) {
1863 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1864 if (ntohl(id) != (u32)(unsigned long)exp) {
1865 nf_ct_expect_put(exp);
1866 return -ENOENT;
1867 }
1868 }
1869
1870 err = -ENOMEM;
1871 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1872 if (skb2 == NULL)
1873 goto out;
1874
1875 rcu_read_lock();
1876 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1877 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1878 rcu_read_unlock();
1879 if (err <= 0)
1880 goto free;
1881
1882 nf_ct_expect_put(exp);
1883
1884 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1885
1886 free:
1887 kfree_skb(skb2);
1888 out:
1889 nf_ct_expect_put(exp);
1890 return err;
1891 }
1892
1893 static int
1894 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1895 const struct nlmsghdr *nlh,
1896 const struct nlattr * const cda[])
1897 {
1898 struct net *net = sock_net(ctnl);
1899 struct nf_conntrack_expect *exp;
1900 struct nf_conntrack_tuple tuple;
1901 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1902 struct hlist_node *n, *next;
1903 u_int8_t u3 = nfmsg->nfgen_family;
1904 unsigned int i;
1905 u16 zone;
1906 int err;
1907
1908 if (cda[CTA_EXPECT_TUPLE]) {
1909 /* delete a single expect by tuple */
1910 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1911 if (err < 0)
1912 return err;
1913
1914 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1915 if (err < 0)
1916 return err;
1917
1918 /* bump usage count to 2 */
1919 exp = nf_ct_expect_find_get(net, zone, &tuple);
1920 if (!exp)
1921 return -ENOENT;
1922
1923 if (cda[CTA_EXPECT_ID]) {
1924 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1925 if (ntohl(id) != (u32)(unsigned long)exp) {
1926 nf_ct_expect_put(exp);
1927 return -ENOENT;
1928 }
1929 }
1930
1931 /* after list removal, usage count == 1 */
1932 spin_lock_bh(&nf_conntrack_lock);
1933 if (del_timer(&exp->timeout)) {
1934 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1935 nlmsg_report(nlh));
1936 nf_ct_expect_put(exp);
1937 }
1938 spin_unlock_bh(&nf_conntrack_lock);
1939 /* have to put what we 'get' above.
1940 * after this line usage count == 0 */
1941 nf_ct_expect_put(exp);
1942 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1943 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1944 struct nf_conn_help *m_help;
1945
1946 /* delete all expectations for this helper */
1947 spin_lock_bh(&nf_conntrack_lock);
1948 for (i = 0; i < nf_ct_expect_hsize; i++) {
1949 hlist_for_each_entry_safe(exp, n, next,
1950 &net->ct.expect_hash[i],
1951 hnode) {
1952 m_help = nfct_help(exp->master);
1953 if (!strcmp(m_help->helper->name, name) &&
1954 del_timer(&exp->timeout)) {
1955 nf_ct_unlink_expect_report(exp,
1956 NETLINK_CB(skb).pid,
1957 nlmsg_report(nlh));
1958 nf_ct_expect_put(exp);
1959 }
1960 }
1961 }
1962 spin_unlock_bh(&nf_conntrack_lock);
1963 } else {
1964 /* This basically means we have to flush everything*/
1965 spin_lock_bh(&nf_conntrack_lock);
1966 for (i = 0; i < nf_ct_expect_hsize; i++) {
1967 hlist_for_each_entry_safe(exp, n, next,
1968 &net->ct.expect_hash[i],
1969 hnode) {
1970 if (del_timer(&exp->timeout)) {
1971 nf_ct_unlink_expect_report(exp,
1972 NETLINK_CB(skb).pid,
1973 nlmsg_report(nlh));
1974 nf_ct_expect_put(exp);
1975 }
1976 }
1977 }
1978 spin_unlock_bh(&nf_conntrack_lock);
1979 }
1980
1981 return 0;
1982 }
1983 static int
1984 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1985 const struct nlattr * const cda[])
1986 {
1987 return -EOPNOTSUPP;
1988 }
1989
1990 static int
1991 ctnetlink_create_expect(struct net *net, u16 zone,
1992 const struct nlattr * const cda[],
1993 u_int8_t u3,
1994 u32 pid, int report)
1995 {
1996 struct nf_conntrack_tuple tuple, mask, master_tuple;
1997 struct nf_conntrack_tuple_hash *h = NULL;
1998 struct nf_conntrack_expect *exp;
1999 struct nf_conn *ct;
2000 struct nf_conn_help *help;
2001 int err = 0;
2002
2003 /* caller guarantees that those three CTA_EXPECT_* exist */
2004 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2005 if (err < 0)
2006 return err;
2007 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2008 if (err < 0)
2009 return err;
2010 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2011 if (err < 0)
2012 return err;
2013
2014 /* Look for master conntrack of this expectation */
2015 h = nf_conntrack_find_get(net, zone, &master_tuple);
2016 if (!h)
2017 return -ENOENT;
2018 ct = nf_ct_tuplehash_to_ctrack(h);
2019 exp = nf_ct_expect_alloc(ct);
2020 if (!exp) {
2021 err = -ENOMEM;
2022 goto out;
2023 }
2024 help = nfct_help(ct);
2025 if (!help) {
2026 if (!cda[CTA_EXPECT_TIMEOUT]) {
2027 err = -EINVAL;
2028 goto out;
2029 }
2030 exp->timeout.expires =
2031 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2032
2033 exp->flags = NF_CT_EXPECT_USERSPACE;
2034 if (cda[CTA_EXPECT_FLAGS]) {
2035 exp->flags |=
2036 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2037 }
2038 } else {
2039 if (cda[CTA_EXPECT_FLAGS]) {
2040 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2041 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2042 } else
2043 exp->flags = 0;
2044 }
2045
2046 exp->class = 0;
2047 exp->expectfn = NULL;
2048 exp->master = ct;
2049 exp->helper = NULL;
2050 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2051 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2052 exp->mask.src.u.all = mask.src.u.all;
2053
2054 err = nf_ct_expect_related_report(exp, pid, report);
2055 nf_ct_expect_put(exp);
2056
2057 out:
2058 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2059 return err;
2060 }
2061
2062 static int
2063 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2064 const struct nlmsghdr *nlh,
2065 const struct nlattr * const cda[])
2066 {
2067 struct net *net = sock_net(ctnl);
2068 struct nf_conntrack_tuple tuple;
2069 struct nf_conntrack_expect *exp;
2070 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2071 u_int8_t u3 = nfmsg->nfgen_family;
2072 u16 zone;
2073 int err;
2074
2075 if (!cda[CTA_EXPECT_TUPLE]
2076 || !cda[CTA_EXPECT_MASK]
2077 || !cda[CTA_EXPECT_MASTER])
2078 return -EINVAL;
2079
2080 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2081 if (err < 0)
2082 return err;
2083
2084 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2085 if (err < 0)
2086 return err;
2087
2088 spin_lock_bh(&nf_conntrack_lock);
2089 exp = __nf_ct_expect_find(net, zone, &tuple);
2090
2091 if (!exp) {
2092 spin_unlock_bh(&nf_conntrack_lock);
2093 err = -ENOENT;
2094 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2095 err = ctnetlink_create_expect(net, zone, cda,
2096 u3,
2097 NETLINK_CB(skb).pid,
2098 nlmsg_report(nlh));
2099 }
2100 return err;
2101 }
2102
2103 err = -EEXIST;
2104 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2105 err = ctnetlink_change_expect(exp, cda);
2106 spin_unlock_bh(&nf_conntrack_lock);
2107
2108 return err;
2109 }
2110
2111 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2112 static struct nf_ct_event_notifier ctnl_notifier = {
2113 .fcn = ctnetlink_conntrack_event,
2114 };
2115
2116 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2117 .fcn = ctnetlink_expect_event,
2118 };
2119 #endif
2120
2121 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2122 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2123 .attr_count = CTA_MAX,
2124 .policy = ct_nla_policy },
2125 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2126 .attr_count = CTA_MAX,
2127 .policy = ct_nla_policy },
2128 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2129 .attr_count = CTA_MAX,
2130 .policy = ct_nla_policy },
2131 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2132 .attr_count = CTA_MAX,
2133 .policy = ct_nla_policy },
2134 };
2135
2136 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2137 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2138 .attr_count = CTA_EXPECT_MAX,
2139 .policy = exp_nla_policy },
2140 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2141 .attr_count = CTA_EXPECT_MAX,
2142 .policy = exp_nla_policy },
2143 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2144 .attr_count = CTA_EXPECT_MAX,
2145 .policy = exp_nla_policy },
2146 };
2147
2148 static const struct nfnetlink_subsystem ctnl_subsys = {
2149 .name = "conntrack",
2150 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2151 .cb_count = IPCTNL_MSG_MAX,
2152 .cb = ctnl_cb,
2153 };
2154
2155 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2156 .name = "conntrack_expect",
2157 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2158 .cb_count = IPCTNL_MSG_EXP_MAX,
2159 .cb = ctnl_exp_cb,
2160 };
2161
2162 MODULE_ALIAS("ip_conntrack_netlink");
2163 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2164 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2165
2166 static int __init ctnetlink_init(void)
2167 {
2168 int ret;
2169
2170 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2171 ret = nfnetlink_subsys_register(&ctnl_subsys);
2172 if (ret < 0) {
2173 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2174 goto err_out;
2175 }
2176
2177 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2178 if (ret < 0) {
2179 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2180 goto err_unreg_subsys;
2181 }
2182
2183 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2184 ret = nf_conntrack_register_notifier(&ctnl_notifier);
2185 if (ret < 0) {
2186 pr_err("ctnetlink_init: cannot register notifier.\n");
2187 goto err_unreg_exp_subsys;
2188 }
2189
2190 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2191 if (ret < 0) {
2192 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2193 goto err_unreg_notifier;
2194 }
2195 #endif
2196
2197 return 0;
2198
2199 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2200 err_unreg_notifier:
2201 nf_conntrack_unregister_notifier(&ctnl_notifier);
2202 err_unreg_exp_subsys:
2203 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2204 #endif
2205 err_unreg_subsys:
2206 nfnetlink_subsys_unregister(&ctnl_subsys);
2207 err_out:
2208 return ret;
2209 }
2210
2211 static void __exit ctnetlink_exit(void)
2212 {
2213 pr_info("ctnetlink: unregistering from nfnetlink.\n");
2214
2215 nf_ct_remove_userspace_expectations();
2216 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2217 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2218 nf_conntrack_unregister_notifier(&ctnl_notifier);
2219 #endif
2220
2221 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2222 nfnetlink_subsys_unregister(&ctnl_subsys);
2223 }
2224
2225 module_init(ctnetlink_init);
2226 module_exit(ctnetlink_exit);
x86 "subsystem" repository