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Merge branch 'v3.2-samsung-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / net / netfilter / nf_conntrack_netlink.c
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) 2005-2011 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_INIT_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_INIT_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 spin_unlock_bh(&nf_conntrack_lock);
1362 #ifdef CONFIG_MODULES
1363 if (request_module("nfct-helper-%s", helpname) < 0) {
1364 spin_lock_bh(&nf_conntrack_lock);
1365 err = -EOPNOTSUPP;
1366 goto err1;
1367 }
1368
1369 spin_lock_bh(&nf_conntrack_lock);
1370 rcu_read_lock();
1371 helper = __nf_conntrack_helper_find(helpname,
1372 nf_ct_l3num(ct),
1373 nf_ct_protonum(ct));
1374 if (helper) {
1375 err = -EAGAIN;
1376 goto err2;
1377 }
1378 rcu_read_unlock();
1379 #endif
1380 err = -EOPNOTSUPP;
1381 goto err1;
1382 } else {
1383 struct nf_conn_help *help;
1384
1385 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1386 if (help == NULL) {
1387 err = -ENOMEM;
1388 goto err2;
1389 }
1390
1391 /* not in hash table yet so not strictly necessary */
1392 RCU_INIT_POINTER(help->helper, helper);
1393 }
1394 } else {
1395 /* try an implicit helper assignation */
1396 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1397 if (err < 0)
1398 goto err2;
1399 }
1400
1401 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1402 err = ctnetlink_change_nat(ct, cda);
1403 if (err < 0)
1404 goto err2;
1405 }
1406
1407 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1408 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1409 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1410 /* we must add conntrack extensions before confirmation. */
1411 ct->status |= IPS_CONFIRMED;
1412
1413 if (cda[CTA_STATUS]) {
1414 err = ctnetlink_change_status(ct, cda);
1415 if (err < 0)
1416 goto err2;
1417 }
1418
1419 #ifdef CONFIG_NF_NAT_NEEDED
1420 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1421 err = ctnetlink_change_nat_seq_adj(ct, cda);
1422 if (err < 0)
1423 goto err2;
1424 }
1425 #endif
1426
1427 memset(&ct->proto, 0, sizeof(ct->proto));
1428 if (cda[CTA_PROTOINFO]) {
1429 err = ctnetlink_change_protoinfo(ct, cda);
1430 if (err < 0)
1431 goto err2;
1432 }
1433
1434 #if defined(CONFIG_NF_CONNTRACK_MARK)
1435 if (cda[CTA_MARK])
1436 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1437 #endif
1438
1439 /* setup master conntrack: this is a confirmed expectation */
1440 if (cda[CTA_TUPLE_MASTER]) {
1441 struct nf_conntrack_tuple master;
1442 struct nf_conntrack_tuple_hash *master_h;
1443 struct nf_conn *master_ct;
1444
1445 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1446 if (err < 0)
1447 goto err2;
1448
1449 master_h = nf_conntrack_find_get(net, zone, &master);
1450 if (master_h == NULL) {
1451 err = -ENOENT;
1452 goto err2;
1453 }
1454 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1455 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1456 ct->master = master_ct;
1457 }
1458 tstamp = nf_conn_tstamp_find(ct);
1459 if (tstamp)
1460 tstamp->start = ktime_to_ns(ktime_get_real());
1461
1462 add_timer(&ct->timeout);
1463 nf_conntrack_hash_insert(ct);
1464 rcu_read_unlock();
1465
1466 return ct;
1467
1468 err2:
1469 rcu_read_unlock();
1470 err1:
1471 nf_conntrack_free(ct);
1472 return ERR_PTR(err);
1473 }
1474
1475 static int
1476 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1477 const struct nlmsghdr *nlh,
1478 const struct nlattr * const cda[])
1479 {
1480 struct net *net = sock_net(ctnl);
1481 struct nf_conntrack_tuple otuple, rtuple;
1482 struct nf_conntrack_tuple_hash *h = NULL;
1483 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1484 u_int8_t u3 = nfmsg->nfgen_family;
1485 u16 zone;
1486 int err;
1487
1488 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1489 if (err < 0)
1490 return err;
1491
1492 if (cda[CTA_TUPLE_ORIG]) {
1493 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1494 if (err < 0)
1495 return err;
1496 }
1497
1498 if (cda[CTA_TUPLE_REPLY]) {
1499 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1500 if (err < 0)
1501 return err;
1502 }
1503
1504 spin_lock_bh(&nf_conntrack_lock);
1505 if (cda[CTA_TUPLE_ORIG])
1506 h = __nf_conntrack_find(net, zone, &otuple);
1507 else if (cda[CTA_TUPLE_REPLY])
1508 h = __nf_conntrack_find(net, zone, &rtuple);
1509
1510 if (h == NULL) {
1511 err = -ENOENT;
1512 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1513 struct nf_conn *ct;
1514 enum ip_conntrack_events events;
1515
1516 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1517 &rtuple, u3);
1518 if (IS_ERR(ct)) {
1519 err = PTR_ERR(ct);
1520 goto out_unlock;
1521 }
1522 err = 0;
1523 nf_conntrack_get(&ct->ct_general);
1524 spin_unlock_bh(&nf_conntrack_lock);
1525 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1526 events = IPCT_RELATED;
1527 else
1528 events = IPCT_NEW;
1529
1530 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1531 (1 << IPCT_ASSURED) |
1532 (1 << IPCT_HELPER) |
1533 (1 << IPCT_PROTOINFO) |
1534 (1 << IPCT_NATSEQADJ) |
1535 (1 << IPCT_MARK) | events,
1536 ct, NETLINK_CB(skb).pid,
1537 nlmsg_report(nlh));
1538 nf_ct_put(ct);
1539 } else
1540 spin_unlock_bh(&nf_conntrack_lock);
1541
1542 return err;
1543 }
1544 /* implicit 'else' */
1545
1546 /* We manipulate the conntrack inside the global conntrack table lock,
1547 * so there's no need to increase the refcount */
1548 err = -EEXIST;
1549 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1550 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1551
1552 err = ctnetlink_change_conntrack(ct, cda);
1553 if (err == 0) {
1554 nf_conntrack_get(&ct->ct_general);
1555 spin_unlock_bh(&nf_conntrack_lock);
1556 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1557 (1 << IPCT_ASSURED) |
1558 (1 << IPCT_HELPER) |
1559 (1 << IPCT_PROTOINFO) |
1560 (1 << IPCT_NATSEQADJ) |
1561 (1 << IPCT_MARK),
1562 ct, NETLINK_CB(skb).pid,
1563 nlmsg_report(nlh));
1564 nf_ct_put(ct);
1565 } else
1566 spin_unlock_bh(&nf_conntrack_lock);
1567
1568 return err;
1569 }
1570
1571 out_unlock:
1572 spin_unlock_bh(&nf_conntrack_lock);
1573 return err;
1574 }
1575
1576 /***********************************************************************
1577 * EXPECT
1578 ***********************************************************************/
1579
1580 static inline int
1581 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1582 const struct nf_conntrack_tuple *tuple,
1583 enum ctattr_expect type)
1584 {
1585 struct nlattr *nest_parms;
1586
1587 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1588 if (!nest_parms)
1589 goto nla_put_failure;
1590 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1591 goto nla_put_failure;
1592 nla_nest_end(skb, nest_parms);
1593
1594 return 0;
1595
1596 nla_put_failure:
1597 return -1;
1598 }
1599
1600 static inline int
1601 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1602 const struct nf_conntrack_tuple *tuple,
1603 const struct nf_conntrack_tuple_mask *mask)
1604 {
1605 int ret;
1606 struct nf_conntrack_l3proto *l3proto;
1607 struct nf_conntrack_l4proto *l4proto;
1608 struct nf_conntrack_tuple m;
1609 struct nlattr *nest_parms;
1610
1611 memset(&m, 0xFF, sizeof(m));
1612 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1613 m.src.u.all = mask->src.u.all;
1614 m.dst.protonum = tuple->dst.protonum;
1615
1616 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1617 if (!nest_parms)
1618 goto nla_put_failure;
1619
1620 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1621 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1622
1623 if (unlikely(ret < 0))
1624 goto nla_put_failure;
1625
1626 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1627 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1628 if (unlikely(ret < 0))
1629 goto nla_put_failure;
1630
1631 nla_nest_end(skb, nest_parms);
1632
1633 return 0;
1634
1635 nla_put_failure:
1636 return -1;
1637 }
1638
1639 static int
1640 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1641 const struct nf_conntrack_expect *exp)
1642 {
1643 struct nf_conn *master = exp->master;
1644 long timeout = (exp->timeout.expires - jiffies) / HZ;
1645 struct nf_conn_help *help;
1646
1647 if (timeout < 0)
1648 timeout = 0;
1649
1650 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1651 goto nla_put_failure;
1652 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1653 goto nla_put_failure;
1654 if (ctnetlink_exp_dump_tuple(skb,
1655 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1656 CTA_EXPECT_MASTER) < 0)
1657 goto nla_put_failure;
1658
1659 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1660 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1661 NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1662 help = nfct_help(master);
1663 if (help) {
1664 struct nf_conntrack_helper *helper;
1665
1666 helper = rcu_dereference(help->helper);
1667 if (helper)
1668 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1669 }
1670
1671 return 0;
1672
1673 nla_put_failure:
1674 return -1;
1675 }
1676
1677 static int
1678 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1679 int event, const struct nf_conntrack_expect *exp)
1680 {
1681 struct nlmsghdr *nlh;
1682 struct nfgenmsg *nfmsg;
1683 unsigned int flags = pid ? NLM_F_MULTI : 0;
1684
1685 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1686 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1687 if (nlh == NULL)
1688 goto nlmsg_failure;
1689
1690 nfmsg = nlmsg_data(nlh);
1691 nfmsg->nfgen_family = exp->tuple.src.l3num;
1692 nfmsg->version = NFNETLINK_V0;
1693 nfmsg->res_id = 0;
1694
1695 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1696 goto nla_put_failure;
1697
1698 nlmsg_end(skb, nlh);
1699 return skb->len;
1700
1701 nlmsg_failure:
1702 nla_put_failure:
1703 nlmsg_cancel(skb, nlh);
1704 return -1;
1705 }
1706
1707 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1708 static int
1709 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1710 {
1711 struct nf_conntrack_expect *exp = item->exp;
1712 struct net *net = nf_ct_exp_net(exp);
1713 struct nlmsghdr *nlh;
1714 struct nfgenmsg *nfmsg;
1715 struct sk_buff *skb;
1716 unsigned int type, group;
1717 int flags = 0;
1718
1719 if (events & (1 << IPEXP_DESTROY)) {
1720 type = IPCTNL_MSG_EXP_DELETE;
1721 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1722 } else if (events & (1 << IPEXP_NEW)) {
1723 type = IPCTNL_MSG_EXP_NEW;
1724 flags = NLM_F_CREATE|NLM_F_EXCL;
1725 group = NFNLGRP_CONNTRACK_EXP_NEW;
1726 } else
1727 return 0;
1728
1729 if (!item->report && !nfnetlink_has_listeners(net, group))
1730 return 0;
1731
1732 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1733 if (skb == NULL)
1734 goto errout;
1735
1736 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1737 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1738 if (nlh == NULL)
1739 goto nlmsg_failure;
1740
1741 nfmsg = nlmsg_data(nlh);
1742 nfmsg->nfgen_family = exp->tuple.src.l3num;
1743 nfmsg->version = NFNETLINK_V0;
1744 nfmsg->res_id = 0;
1745
1746 rcu_read_lock();
1747 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1748 goto nla_put_failure;
1749 rcu_read_unlock();
1750
1751 nlmsg_end(skb, nlh);
1752 nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1753 return 0;
1754
1755 nla_put_failure:
1756 rcu_read_unlock();
1757 nlmsg_cancel(skb, nlh);
1758 nlmsg_failure:
1759 kfree_skb(skb);
1760 errout:
1761 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1762 return 0;
1763 }
1764 #endif
1765 static int ctnetlink_exp_done(struct netlink_callback *cb)
1766 {
1767 if (cb->args[1])
1768 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1769 return 0;
1770 }
1771
1772 static int
1773 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1774 {
1775 struct net *net = sock_net(skb->sk);
1776 struct nf_conntrack_expect *exp, *last;
1777 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1778 struct hlist_node *n;
1779 u_int8_t l3proto = nfmsg->nfgen_family;
1780
1781 rcu_read_lock();
1782 last = (struct nf_conntrack_expect *)cb->args[1];
1783 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1784 restart:
1785 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1786 hnode) {
1787 if (l3proto && exp->tuple.src.l3num != l3proto)
1788 continue;
1789 if (cb->args[1]) {
1790 if (exp != last)
1791 continue;
1792 cb->args[1] = 0;
1793 }
1794 if (ctnetlink_exp_fill_info(skb,
1795 NETLINK_CB(cb->skb).pid,
1796 cb->nlh->nlmsg_seq,
1797 IPCTNL_MSG_EXP_NEW,
1798 exp) < 0) {
1799 if (!atomic_inc_not_zero(&exp->use))
1800 continue;
1801 cb->args[1] = (unsigned long)exp;
1802 goto out;
1803 }
1804 }
1805 if (cb->args[1]) {
1806 cb->args[1] = 0;
1807 goto restart;
1808 }
1809 }
1810 out:
1811 rcu_read_unlock();
1812 if (last)
1813 nf_ct_expect_put(last);
1814
1815 return skb->len;
1816 }
1817
1818 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1819 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1820 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1821 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1822 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1823 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1824 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1825 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
1826 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
1827 };
1828
1829 static int
1830 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1831 const struct nlmsghdr *nlh,
1832 const struct nlattr * const cda[])
1833 {
1834 struct net *net = sock_net(ctnl);
1835 struct nf_conntrack_tuple tuple;
1836 struct nf_conntrack_expect *exp;
1837 struct sk_buff *skb2;
1838 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1839 u_int8_t u3 = nfmsg->nfgen_family;
1840 u16 zone;
1841 int err;
1842
1843 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1844 return netlink_dump_start(ctnl, skb, nlh,
1845 ctnetlink_exp_dump_table,
1846 ctnetlink_exp_done, 0);
1847 }
1848
1849 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1850 if (err < 0)
1851 return err;
1852
1853 if (cda[CTA_EXPECT_MASTER])
1854 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1855 else
1856 return -EINVAL;
1857
1858 if (err < 0)
1859 return err;
1860
1861 exp = nf_ct_expect_find_get(net, zone, &tuple);
1862 if (!exp)
1863 return -ENOENT;
1864
1865 if (cda[CTA_EXPECT_ID]) {
1866 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1867 if (ntohl(id) != (u32)(unsigned long)exp) {
1868 nf_ct_expect_put(exp);
1869 return -ENOENT;
1870 }
1871 }
1872
1873 err = -ENOMEM;
1874 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1875 if (skb2 == NULL) {
1876 nf_ct_expect_put(exp);
1877 goto out;
1878 }
1879
1880 rcu_read_lock();
1881 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1882 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1883 rcu_read_unlock();
1884 nf_ct_expect_put(exp);
1885 if (err <= 0)
1886 goto free;
1887
1888 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1889 if (err < 0)
1890 goto out;
1891
1892 return 0;
1893
1894 free:
1895 kfree_skb(skb2);
1896 out:
1897 /* this avoids a loop in nfnetlink. */
1898 return err == -EAGAIN ? -ENOBUFS : err;
1899 }
1900
1901 static int
1902 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1903 const struct nlmsghdr *nlh,
1904 const struct nlattr * const cda[])
1905 {
1906 struct net *net = sock_net(ctnl);
1907 struct nf_conntrack_expect *exp;
1908 struct nf_conntrack_tuple tuple;
1909 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1910 struct hlist_node *n, *next;
1911 u_int8_t u3 = nfmsg->nfgen_family;
1912 unsigned int i;
1913 u16 zone;
1914 int err;
1915
1916 if (cda[CTA_EXPECT_TUPLE]) {
1917 /* delete a single expect by tuple */
1918 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1919 if (err < 0)
1920 return err;
1921
1922 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1923 if (err < 0)
1924 return err;
1925
1926 /* bump usage count to 2 */
1927 exp = nf_ct_expect_find_get(net, zone, &tuple);
1928 if (!exp)
1929 return -ENOENT;
1930
1931 if (cda[CTA_EXPECT_ID]) {
1932 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1933 if (ntohl(id) != (u32)(unsigned long)exp) {
1934 nf_ct_expect_put(exp);
1935 return -ENOENT;
1936 }
1937 }
1938
1939 /* after list removal, usage count == 1 */
1940 spin_lock_bh(&nf_conntrack_lock);
1941 if (del_timer(&exp->timeout)) {
1942 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1943 nlmsg_report(nlh));
1944 nf_ct_expect_put(exp);
1945 }
1946 spin_unlock_bh(&nf_conntrack_lock);
1947 /* have to put what we 'get' above.
1948 * after this line usage count == 0 */
1949 nf_ct_expect_put(exp);
1950 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1951 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1952 struct nf_conn_help *m_help;
1953
1954 /* delete all expectations for this helper */
1955 spin_lock_bh(&nf_conntrack_lock);
1956 for (i = 0; i < nf_ct_expect_hsize; i++) {
1957 hlist_for_each_entry_safe(exp, n, next,
1958 &net->ct.expect_hash[i],
1959 hnode) {
1960 m_help = nfct_help(exp->master);
1961 if (!strcmp(m_help->helper->name, name) &&
1962 del_timer(&exp->timeout)) {
1963 nf_ct_unlink_expect_report(exp,
1964 NETLINK_CB(skb).pid,
1965 nlmsg_report(nlh));
1966 nf_ct_expect_put(exp);
1967 }
1968 }
1969 }
1970 spin_unlock_bh(&nf_conntrack_lock);
1971 } else {
1972 /* This basically means we have to flush everything*/
1973 spin_lock_bh(&nf_conntrack_lock);
1974 for (i = 0; i < nf_ct_expect_hsize; i++) {
1975 hlist_for_each_entry_safe(exp, n, next,
1976 &net->ct.expect_hash[i],
1977 hnode) {
1978 if (del_timer(&exp->timeout)) {
1979 nf_ct_unlink_expect_report(exp,
1980 NETLINK_CB(skb).pid,
1981 nlmsg_report(nlh));
1982 nf_ct_expect_put(exp);
1983 }
1984 }
1985 }
1986 spin_unlock_bh(&nf_conntrack_lock);
1987 }
1988
1989 return 0;
1990 }
1991 static int
1992 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1993 const struct nlattr * const cda[])
1994 {
1995 return -EOPNOTSUPP;
1996 }
1997
1998 static int
1999 ctnetlink_create_expect(struct net *net, u16 zone,
2000 const struct nlattr * const cda[],
2001 u_int8_t u3,
2002 u32 pid, int report)
2003 {
2004 struct nf_conntrack_tuple tuple, mask, master_tuple;
2005 struct nf_conntrack_tuple_hash *h = NULL;
2006 struct nf_conntrack_expect *exp;
2007 struct nf_conn *ct;
2008 struct nf_conn_help *help;
2009 int err = 0;
2010
2011 /* caller guarantees that those three CTA_EXPECT_* exist */
2012 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2013 if (err < 0)
2014 return err;
2015 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2016 if (err < 0)
2017 return err;
2018 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2019 if (err < 0)
2020 return err;
2021
2022 /* Look for master conntrack of this expectation */
2023 h = nf_conntrack_find_get(net, zone, &master_tuple);
2024 if (!h)
2025 return -ENOENT;
2026 ct = nf_ct_tuplehash_to_ctrack(h);
2027 exp = nf_ct_expect_alloc(ct);
2028 if (!exp) {
2029 err = -ENOMEM;
2030 goto out;
2031 }
2032 help = nfct_help(ct);
2033 if (!help) {
2034 if (!cda[CTA_EXPECT_TIMEOUT]) {
2035 err = -EINVAL;
2036 goto out;
2037 }
2038 exp->timeout.expires =
2039 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2040
2041 exp->flags = NF_CT_EXPECT_USERSPACE;
2042 if (cda[CTA_EXPECT_FLAGS]) {
2043 exp->flags |=
2044 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2045 }
2046 } else {
2047 if (cda[CTA_EXPECT_FLAGS]) {
2048 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2049 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2050 } else
2051 exp->flags = 0;
2052 }
2053
2054 exp->class = 0;
2055 exp->expectfn = NULL;
2056 exp->master = ct;
2057 exp->helper = NULL;
2058 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2059 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2060 exp->mask.src.u.all = mask.src.u.all;
2061
2062 err = nf_ct_expect_related_report(exp, pid, report);
2063 nf_ct_expect_put(exp);
2064
2065 out:
2066 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2067 return err;
2068 }
2069
2070 static int
2071 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2072 const struct nlmsghdr *nlh,
2073 const struct nlattr * const cda[])
2074 {
2075 struct net *net = sock_net(ctnl);
2076 struct nf_conntrack_tuple tuple;
2077 struct nf_conntrack_expect *exp;
2078 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2079 u_int8_t u3 = nfmsg->nfgen_family;
2080 u16 zone;
2081 int err;
2082
2083 if (!cda[CTA_EXPECT_TUPLE]
2084 || !cda[CTA_EXPECT_MASK]
2085 || !cda[CTA_EXPECT_MASTER])
2086 return -EINVAL;
2087
2088 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2089 if (err < 0)
2090 return err;
2091
2092 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2093 if (err < 0)
2094 return err;
2095
2096 spin_lock_bh(&nf_conntrack_lock);
2097 exp = __nf_ct_expect_find(net, zone, &tuple);
2098
2099 if (!exp) {
2100 spin_unlock_bh(&nf_conntrack_lock);
2101 err = -ENOENT;
2102 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2103 err = ctnetlink_create_expect(net, zone, cda,
2104 u3,
2105 NETLINK_CB(skb).pid,
2106 nlmsg_report(nlh));
2107 }
2108 return err;
2109 }
2110
2111 err = -EEXIST;
2112 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2113 err = ctnetlink_change_expect(exp, cda);
2114 spin_unlock_bh(&nf_conntrack_lock);
2115
2116 return err;
2117 }
2118
2119 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2120 static struct nf_ct_event_notifier ctnl_notifier = {
2121 .fcn = ctnetlink_conntrack_event,
2122 };
2123
2124 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2125 .fcn = ctnetlink_expect_event,
2126 };
2127 #endif
2128
2129 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2130 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2131 .attr_count = CTA_MAX,
2132 .policy = ct_nla_policy },
2133 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2134 .attr_count = CTA_MAX,
2135 .policy = ct_nla_policy },
2136 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2137 .attr_count = CTA_MAX,
2138 .policy = ct_nla_policy },
2139 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2140 .attr_count = CTA_MAX,
2141 .policy = ct_nla_policy },
2142 };
2143
2144 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2145 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2146 .attr_count = CTA_EXPECT_MAX,
2147 .policy = exp_nla_policy },
2148 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2149 .attr_count = CTA_EXPECT_MAX,
2150 .policy = exp_nla_policy },
2151 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2152 .attr_count = CTA_EXPECT_MAX,
2153 .policy = exp_nla_policy },
2154 };
2155
2156 static const struct nfnetlink_subsystem ctnl_subsys = {
2157 .name = "conntrack",
2158 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2159 .cb_count = IPCTNL_MSG_MAX,
2160 .cb = ctnl_cb,
2161 };
2162
2163 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2164 .name = "conntrack_expect",
2165 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2166 .cb_count = IPCTNL_MSG_EXP_MAX,
2167 .cb = ctnl_exp_cb,
2168 };
2169
2170 MODULE_ALIAS("ip_conntrack_netlink");
2171 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2172 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2173
2174 static int __net_init ctnetlink_net_init(struct net *net)
2175 {
2176 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2177 int ret;
2178
2179 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
2180 if (ret < 0) {
2181 pr_err("ctnetlink_init: cannot register notifier.\n");
2182 goto err_out;
2183 }
2184
2185 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
2186 if (ret < 0) {
2187 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2188 goto err_unreg_notifier;
2189 }
2190 #endif
2191 return 0;
2192
2193 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2194 err_unreg_notifier:
2195 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2196 err_out:
2197 return ret;
2198 #endif
2199 }
2200
2201 static void ctnetlink_net_exit(struct net *net)
2202 {
2203 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2204 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
2205 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2206 #endif
2207 }
2208
2209 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
2210 {
2211 struct net *net;
2212
2213 list_for_each_entry(net, net_exit_list, exit_list)
2214 ctnetlink_net_exit(net);
2215 }
2216
2217 static struct pernet_operations ctnetlink_net_ops = {
2218 .init = ctnetlink_net_init,
2219 .exit_batch = ctnetlink_net_exit_batch,
2220 };
2221
2222 static int __init ctnetlink_init(void)
2223 {
2224 int ret;
2225
2226 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2227 ret = nfnetlink_subsys_register(&ctnl_subsys);
2228 if (ret < 0) {
2229 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2230 goto err_out;
2231 }
2232
2233 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2234 if (ret < 0) {
2235 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2236 goto err_unreg_subsys;
2237 }
2238
2239 if (register_pernet_subsys(&ctnetlink_net_ops)) {
2240 pr_err("ctnetlink_init: cannot register pernet operations\n");
2241 goto err_unreg_exp_subsys;
2242 }
2243
2244 return 0;
2245
2246 err_unreg_exp_subsys:
2247 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2248 err_unreg_subsys:
2249 nfnetlink_subsys_unregister(&ctnl_subsys);
2250 err_out:
2251 return ret;
2252 }
2253
2254 static void __exit ctnetlink_exit(void)
2255 {
2256 pr_info("ctnetlink: unregistering from nfnetlink.\n");
2257
2258 nf_ct_remove_userspace_expectations();
2259 unregister_pernet_subsys(&ctnetlink_net_ops);
2260 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2261 nfnetlink_subsys_unregister(&ctnl_subsys);
2262 }
2263
2264 module_init(ctnetlink_init);
2265 module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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