projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'master' of /repos/git/net-next-2.6
[GitHub/exynos8895/android_kernel_samsung_universal8895.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) 2005-2008 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 cb->args[1] = (unsigned long)ct;
714 goto out;
715 }
716
717 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
718 IPCTNL_MSG_CT_GET_CTRZERO) {
719 struct nf_conn_counter *acct;
720
721 acct = nf_conn_acct_find(ct);
722 if (acct)
723 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
724 }
725 }
726 if (cb->args[1]) {
727 cb->args[1] = 0;
728 goto restart;
729 }
730 }
731 out:
732 spin_unlock_bh(&nf_conntrack_lock);
733 if (last)
734 nf_ct_put(last);
735
736 return skb->len;
737 }
738
739 static inline int
740 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
741 {
742 struct nlattr *tb[CTA_IP_MAX+1];
743 struct nf_conntrack_l3proto *l3proto;
744 int ret = 0;
745
746 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
747
748 rcu_read_lock();
749 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
750
751 if (likely(l3proto->nlattr_to_tuple)) {
752 ret = nla_validate_nested(attr, CTA_IP_MAX,
753 l3proto->nla_policy);
754 if (ret == 0)
755 ret = l3proto->nlattr_to_tuple(tb, tuple);
756 }
757
758 rcu_read_unlock();
759
760 return ret;
761 }
762
763 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
764 [CTA_PROTO_NUM] = { .type = NLA_U8 },
765 };
766
767 static inline int
768 ctnetlink_parse_tuple_proto(struct nlattr *attr,
769 struct nf_conntrack_tuple *tuple)
770 {
771 struct nlattr *tb[CTA_PROTO_MAX+1];
772 struct nf_conntrack_l4proto *l4proto;
773 int ret = 0;
774
775 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
776 if (ret < 0)
777 return ret;
778
779 if (!tb[CTA_PROTO_NUM])
780 return -EINVAL;
781 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
782
783 rcu_read_lock();
784 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
785
786 if (likely(l4proto->nlattr_to_tuple)) {
787 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
788 l4proto->nla_policy);
789 if (ret == 0)
790 ret = l4proto->nlattr_to_tuple(tb, tuple);
791 }
792
793 rcu_read_unlock();
794
795 return ret;
796 }
797
798 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
799 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
800 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
801 };
802
803 static int
804 ctnetlink_parse_tuple(const struct nlattr * const cda[],
805 struct nf_conntrack_tuple *tuple,
806 enum ctattr_tuple type, u_int8_t l3num)
807 {
808 struct nlattr *tb[CTA_TUPLE_MAX+1];
809 int err;
810
811 memset(tuple, 0, sizeof(*tuple));
812
813 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
814
815 if (!tb[CTA_TUPLE_IP])
816 return -EINVAL;
817
818 tuple->src.l3num = l3num;
819
820 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
821 if (err < 0)
822 return err;
823
824 if (!tb[CTA_TUPLE_PROTO])
825 return -EINVAL;
826
827 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
828 if (err < 0)
829 return err;
830
831 /* orig and expect tuples get DIR_ORIGINAL */
832 if (type == CTA_TUPLE_REPLY)
833 tuple->dst.dir = IP_CT_DIR_REPLY;
834 else
835 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
836
837 return 0;
838 }
839
840 static int
841 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
842 {
843 if (attr)
844 #ifdef CONFIG_NF_CONNTRACK_ZONES
845 *zone = ntohs(nla_get_be16(attr));
846 #else
847 return -EOPNOTSUPP;
848 #endif
849 else
850 *zone = 0;
851
852 return 0;
853 }
854
855 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
856 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
857 };
858
859 static inline int
860 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
861 {
862 struct nlattr *tb[CTA_HELP_MAX+1];
863
864 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
865
866 if (!tb[CTA_HELP_NAME])
867 return -EINVAL;
868
869 *helper_name = nla_data(tb[CTA_HELP_NAME]);
870
871 return 0;
872 }
873
874 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
875 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
876 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
877 [CTA_STATUS] = { .type = NLA_U32 },
878 [CTA_PROTOINFO] = { .type = NLA_NESTED },
879 [CTA_HELP] = { .type = NLA_NESTED },
880 [CTA_NAT_SRC] = { .type = NLA_NESTED },
881 [CTA_TIMEOUT] = { .type = NLA_U32 },
882 [CTA_MARK] = { .type = NLA_U32 },
883 [CTA_ID] = { .type = NLA_U32 },
884 [CTA_NAT_DST] = { .type = NLA_NESTED },
885 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
886 [CTA_ZONE] = { .type = NLA_U16 },
887 };
888
889 static int
890 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
891 const struct nlmsghdr *nlh,
892 const struct nlattr * const cda[])
893 {
894 struct net *net = sock_net(ctnl);
895 struct nf_conntrack_tuple_hash *h;
896 struct nf_conntrack_tuple tuple;
897 struct nf_conn *ct;
898 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
899 u_int8_t u3 = nfmsg->nfgen_family;
900 u16 zone;
901 int err;
902
903 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
904 if (err < 0)
905 return err;
906
907 if (cda[CTA_TUPLE_ORIG])
908 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
909 else if (cda[CTA_TUPLE_REPLY])
910 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
911 else {
912 /* Flush the whole table */
913 nf_conntrack_flush_report(net,
914 NETLINK_CB(skb).pid,
915 nlmsg_report(nlh));
916 return 0;
917 }
918
919 if (err < 0)
920 return err;
921
922 h = nf_conntrack_find_get(net, zone, &tuple);
923 if (!h)
924 return -ENOENT;
925
926 ct = nf_ct_tuplehash_to_ctrack(h);
927
928 if (cda[CTA_ID]) {
929 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
930 if (id != (u32)(unsigned long)ct) {
931 nf_ct_put(ct);
932 return -ENOENT;
933 }
934 }
935
936 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
937 NETLINK_CB(skb).pid,
938 nlmsg_report(nlh)) < 0) {
939 nf_ct_delete_from_lists(ct);
940 /* we failed to report the event, try later */
941 nf_ct_insert_dying_list(ct);
942 nf_ct_put(ct);
943 return 0;
944 }
945
946 /* death_by_timeout would report the event again */
947 set_bit(IPS_DYING_BIT, &ct->status);
948
949 nf_ct_kill(ct);
950 nf_ct_put(ct);
951
952 return 0;
953 }
954
955 static int
956 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
957 const struct nlmsghdr *nlh,
958 const struct nlattr * const cda[])
959 {
960 struct net *net = sock_net(ctnl);
961 struct nf_conntrack_tuple_hash *h;
962 struct nf_conntrack_tuple tuple;
963 struct nf_conn *ct;
964 struct sk_buff *skb2 = NULL;
965 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
966 u_int8_t u3 = nfmsg->nfgen_family;
967 u16 zone;
968 int err;
969
970 if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP)
971 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
972 ctnetlink_done);
973
974 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
975 if (err < 0)
976 return err;
977
978 if (cda[CTA_TUPLE_ORIG])
979 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
980 else if (cda[CTA_TUPLE_REPLY])
981 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
982 else
983 return -EINVAL;
984
985 if (err < 0)
986 return err;
987
988 h = nf_conntrack_find_get(net, zone, &tuple);
989 if (!h)
990 return -ENOENT;
991
992 ct = nf_ct_tuplehash_to_ctrack(h);
993
994 err = -ENOMEM;
995 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
996 if (skb2 == NULL) {
997 nf_ct_put(ct);
998 return -ENOMEM;
999 }
1000
1001 rcu_read_lock();
1002 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
1003 IPCTNL_MSG_CT_NEW, ct);
1004 rcu_read_unlock();
1005 nf_ct_put(ct);
1006 if (err <= 0)
1007 goto free;
1008
1009 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1010 if (err < 0)
1011 goto out;
1012
1013 return 0;
1014
1015 free:
1016 kfree_skb(skb2);
1017 out:
1018 /* this avoids a loop in nfnetlink. */
1019 return err == -EAGAIN ? -ENOBUFS : err;
1020 }
1021
1022 #ifdef CONFIG_NF_NAT_NEEDED
1023 static int
1024 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1025 enum nf_nat_manip_type manip,
1026 const struct nlattr *attr)
1027 {
1028 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1029
1030 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1031 if (!parse_nat_setup) {
1032 #ifdef CONFIG_MODULES
1033 rcu_read_unlock();
1034 spin_unlock_bh(&nf_conntrack_lock);
1035 nfnl_unlock();
1036 if (request_module("nf-nat-ipv4") < 0) {
1037 nfnl_lock();
1038 spin_lock_bh(&nf_conntrack_lock);
1039 rcu_read_lock();
1040 return -EOPNOTSUPP;
1041 }
1042 nfnl_lock();
1043 spin_lock_bh(&nf_conntrack_lock);
1044 rcu_read_lock();
1045 if (nfnetlink_parse_nat_setup_hook)
1046 return -EAGAIN;
1047 #endif
1048 return -EOPNOTSUPP;
1049 }
1050
1051 return parse_nat_setup(ct, manip, attr);
1052 }
1053 #endif
1054
1055 static int
1056 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1057 {
1058 unsigned long d;
1059 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1060 d = ct->status ^ status;
1061
1062 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1063 /* unchangeable */
1064 return -EBUSY;
1065
1066 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1067 /* SEEN_REPLY bit can only be set */
1068 return -EBUSY;
1069
1070 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1071 /* ASSURED bit can only be set */
1072 return -EBUSY;
1073
1074 /* Be careful here, modifying NAT bits can screw up things,
1075 * so don't let users modify them directly if they don't pass
1076 * nf_nat_range. */
1077 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1078 return 0;
1079 }
1080
1081 static int
1082 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1083 {
1084 #ifdef CONFIG_NF_NAT_NEEDED
1085 int ret;
1086
1087 if (cda[CTA_NAT_DST]) {
1088 ret = ctnetlink_parse_nat_setup(ct,
1089 IP_NAT_MANIP_DST,
1090 cda[CTA_NAT_DST]);
1091 if (ret < 0)
1092 return ret;
1093 }
1094 if (cda[CTA_NAT_SRC]) {
1095 ret = ctnetlink_parse_nat_setup(ct,
1096 IP_NAT_MANIP_SRC,
1097 cda[CTA_NAT_SRC]);
1098 if (ret < 0)
1099 return ret;
1100 }
1101 return 0;
1102 #else
1103 return -EOPNOTSUPP;
1104 #endif
1105 }
1106
1107 static inline int
1108 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1109 {
1110 struct nf_conntrack_helper *helper;
1111 struct nf_conn_help *help = nfct_help(ct);
1112 char *helpname = NULL;
1113 int err;
1114
1115 /* don't change helper of sibling connections */
1116 if (ct->master)
1117 return -EBUSY;
1118
1119 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1120 if (err < 0)
1121 return err;
1122
1123 if (!strcmp(helpname, "")) {
1124 if (help && help->helper) {
1125 /* we had a helper before ... */
1126 nf_ct_remove_expectations(ct);
1127 rcu_assign_pointer(help->helper, NULL);
1128 }
1129
1130 return 0;
1131 }
1132
1133 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1134 nf_ct_protonum(ct));
1135 if (helper == NULL) {
1136 #ifdef CONFIG_MODULES
1137 spin_unlock_bh(&nf_conntrack_lock);
1138
1139 if (request_module("nfct-helper-%s", helpname) < 0) {
1140 spin_lock_bh(&nf_conntrack_lock);
1141 return -EOPNOTSUPP;
1142 }
1143
1144 spin_lock_bh(&nf_conntrack_lock);
1145 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1146 nf_ct_protonum(ct));
1147 if (helper)
1148 return -EAGAIN;
1149 #endif
1150 return -EOPNOTSUPP;
1151 }
1152
1153 if (help) {
1154 if (help->helper == helper)
1155 return 0;
1156 if (help->helper)
1157 return -EBUSY;
1158 /* need to zero data of old helper */
1159 memset(&help->help, 0, sizeof(help->help));
1160 } else {
1161 /* we cannot set a helper for an existing conntrack */
1162 return -EOPNOTSUPP;
1163 }
1164
1165 rcu_assign_pointer(help->helper, helper);
1166
1167 return 0;
1168 }
1169
1170 static inline int
1171 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1172 {
1173 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1174
1175 if (!del_timer(&ct->timeout))
1176 return -ETIME;
1177
1178 ct->timeout.expires = jiffies + timeout * HZ;
1179 add_timer(&ct->timeout);
1180
1181 return 0;
1182 }
1183
1184 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1185 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1186 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1187 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1188 };
1189
1190 static inline int
1191 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1192 {
1193 const struct nlattr *attr = cda[CTA_PROTOINFO];
1194 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1195 struct nf_conntrack_l4proto *l4proto;
1196 int err = 0;
1197
1198 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1199
1200 rcu_read_lock();
1201 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1202 if (l4proto->from_nlattr)
1203 err = l4proto->from_nlattr(tb, ct);
1204 rcu_read_unlock();
1205
1206 return err;
1207 }
1208
1209 #ifdef CONFIG_NF_NAT_NEEDED
1210 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1211 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1212 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1213 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1214 };
1215
1216 static inline int
1217 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1218 {
1219 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1220
1221 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1222
1223 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1224 return -EINVAL;
1225
1226 natseq->correction_pos =
1227 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1228
1229 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1230 return -EINVAL;
1231
1232 natseq->offset_before =
1233 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1234
1235 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1236 return -EINVAL;
1237
1238 natseq->offset_after =
1239 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1240
1241 return 0;
1242 }
1243
1244 static int
1245 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1246 const struct nlattr * const cda[])
1247 {
1248 int ret = 0;
1249 struct nf_conn_nat *nat = nfct_nat(ct);
1250
1251 if (!nat)
1252 return 0;
1253
1254 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1255 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1256 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1257 if (ret < 0)
1258 return ret;
1259
1260 ct->status |= IPS_SEQ_ADJUST;
1261 }
1262
1263 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1264 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1265 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1266 if (ret < 0)
1267 return ret;
1268
1269 ct->status |= IPS_SEQ_ADJUST;
1270 }
1271
1272 return 0;
1273 }
1274 #endif
1275
1276 static int
1277 ctnetlink_change_conntrack(struct nf_conn *ct,
1278 const struct nlattr * const cda[])
1279 {
1280 int err;
1281
1282 /* only allow NAT changes and master assignation for new conntracks */
1283 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1284 return -EOPNOTSUPP;
1285
1286 if (cda[CTA_HELP]) {
1287 err = ctnetlink_change_helper(ct, cda);
1288 if (err < 0)
1289 return err;
1290 }
1291
1292 if (cda[CTA_TIMEOUT]) {
1293 err = ctnetlink_change_timeout(ct, cda);
1294 if (err < 0)
1295 return err;
1296 }
1297
1298 if (cda[CTA_STATUS]) {
1299 err = ctnetlink_change_status(ct, cda);
1300 if (err < 0)
1301 return err;
1302 }
1303
1304 if (cda[CTA_PROTOINFO]) {
1305 err = ctnetlink_change_protoinfo(ct, cda);
1306 if (err < 0)
1307 return err;
1308 }
1309
1310 #if defined(CONFIG_NF_CONNTRACK_MARK)
1311 if (cda[CTA_MARK])
1312 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1313 #endif
1314
1315 #ifdef CONFIG_NF_NAT_NEEDED
1316 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1317 err = ctnetlink_change_nat_seq_adj(ct, cda);
1318 if (err < 0)
1319 return err;
1320 }
1321 #endif
1322
1323 return 0;
1324 }
1325
1326 static struct nf_conn *
1327 ctnetlink_create_conntrack(struct net *net, u16 zone,
1328 const struct nlattr * const cda[],
1329 struct nf_conntrack_tuple *otuple,
1330 struct nf_conntrack_tuple *rtuple,
1331 u8 u3)
1332 {
1333 struct nf_conn *ct;
1334 int err = -EINVAL;
1335 struct nf_conntrack_helper *helper;
1336
1337 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1338 if (IS_ERR(ct))
1339 return ERR_PTR(-ENOMEM);
1340
1341 if (!cda[CTA_TIMEOUT])
1342 goto err1;
1343 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1344
1345 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1346
1347 rcu_read_lock();
1348 if (cda[CTA_HELP]) {
1349 char *helpname = NULL;
1350
1351 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1352 if (err < 0)
1353 goto err2;
1354
1355 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1356 nf_ct_protonum(ct));
1357 if (helper == NULL) {
1358 rcu_read_unlock();
1359 #ifdef CONFIG_MODULES
1360 if (request_module("nfct-helper-%s", helpname) < 0) {
1361 err = -EOPNOTSUPP;
1362 goto err1;
1363 }
1364
1365 rcu_read_lock();
1366 helper = __nf_conntrack_helper_find(helpname,
1367 nf_ct_l3num(ct),
1368 nf_ct_protonum(ct));
1369 if (helper) {
1370 err = -EAGAIN;
1371 goto err2;
1372 }
1373 rcu_read_unlock();
1374 #endif
1375 err = -EOPNOTSUPP;
1376 goto err1;
1377 } else {
1378 struct nf_conn_help *help;
1379
1380 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1381 if (help == NULL) {
1382 err = -ENOMEM;
1383 goto err2;
1384 }
1385
1386 /* not in hash table yet so not strictly necessary */
1387 rcu_assign_pointer(help->helper, helper);
1388 }
1389 } else {
1390 /* try an implicit helper assignation */
1391 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1392 if (err < 0)
1393 goto err2;
1394 }
1395
1396 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1397 err = ctnetlink_change_nat(ct, cda);
1398 if (err < 0)
1399 goto err2;
1400 }
1401
1402 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1403 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1404 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1405 /* we must add conntrack extensions before confirmation. */
1406 ct->status |= IPS_CONFIRMED;
1407
1408 if (cda[CTA_STATUS]) {
1409 err = ctnetlink_change_status(ct, cda);
1410 if (err < 0)
1411 goto err2;
1412 }
1413
1414 #ifdef CONFIG_NF_NAT_NEEDED
1415 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1416 err = ctnetlink_change_nat_seq_adj(ct, cda);
1417 if (err < 0)
1418 goto err2;
1419 }
1420 #endif
1421
1422 memset(&ct->proto, 0, sizeof(ct->proto));
1423 if (cda[CTA_PROTOINFO]) {
1424 err = ctnetlink_change_protoinfo(ct, cda);
1425 if (err < 0)
1426 goto err2;
1427 }
1428
1429 #if defined(CONFIG_NF_CONNTRACK_MARK)
1430 if (cda[CTA_MARK])
1431 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1432 #endif
1433
1434 /* setup master conntrack: this is a confirmed expectation */
1435 if (cda[CTA_TUPLE_MASTER]) {
1436 struct nf_conntrack_tuple master;
1437 struct nf_conntrack_tuple_hash *master_h;
1438 struct nf_conn *master_ct;
1439
1440 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1441 if (err < 0)
1442 goto err2;
1443
1444 master_h = nf_conntrack_find_get(net, zone, &master);
1445 if (master_h == NULL) {
1446 err = -ENOENT;
1447 goto err2;
1448 }
1449 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1450 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1451 ct->master = master_ct;
1452 }
1453
1454 add_timer(&ct->timeout);
1455 nf_conntrack_hash_insert(ct);
1456 rcu_read_unlock();
1457
1458 return ct;
1459
1460 err2:
1461 rcu_read_unlock();
1462 err1:
1463 nf_conntrack_free(ct);
1464 return ERR_PTR(err);
1465 }
1466
1467 static int
1468 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1469 const struct nlmsghdr *nlh,
1470 const struct nlattr * const cda[])
1471 {
1472 struct net *net = sock_net(ctnl);
1473 struct nf_conntrack_tuple otuple, rtuple;
1474 struct nf_conntrack_tuple_hash *h = NULL;
1475 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1476 u_int8_t u3 = nfmsg->nfgen_family;
1477 u16 zone;
1478 int err;
1479
1480 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1481 if (err < 0)
1482 return err;
1483
1484 if (cda[CTA_TUPLE_ORIG]) {
1485 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1486 if (err < 0)
1487 return err;
1488 }
1489
1490 if (cda[CTA_TUPLE_REPLY]) {
1491 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1492 if (err < 0)
1493 return err;
1494 }
1495
1496 spin_lock_bh(&nf_conntrack_lock);
1497 if (cda[CTA_TUPLE_ORIG])
1498 h = __nf_conntrack_find(net, zone, &otuple);
1499 else if (cda[CTA_TUPLE_REPLY])
1500 h = __nf_conntrack_find(net, zone, &rtuple);
1501
1502 if (h == NULL) {
1503 err = -ENOENT;
1504 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1505 struct nf_conn *ct;
1506 enum ip_conntrack_events events;
1507
1508 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1509 &rtuple, u3);
1510 if (IS_ERR(ct)) {
1511 err = PTR_ERR(ct);
1512 goto out_unlock;
1513 }
1514 err = 0;
1515 nf_conntrack_get(&ct->ct_general);
1516 spin_unlock_bh(&nf_conntrack_lock);
1517 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1518 events = IPCT_RELATED;
1519 else
1520 events = IPCT_NEW;
1521
1522 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1523 (1 << IPCT_ASSURED) |
1524 (1 << IPCT_HELPER) |
1525 (1 << IPCT_PROTOINFO) |
1526 (1 << IPCT_NATSEQADJ) |
1527 (1 << IPCT_MARK) | events,
1528 ct, NETLINK_CB(skb).pid,
1529 nlmsg_report(nlh));
1530 nf_ct_put(ct);
1531 } else
1532 spin_unlock_bh(&nf_conntrack_lock);
1533
1534 return err;
1535 }
1536 /* implicit 'else' */
1537
1538 /* We manipulate the conntrack inside the global conntrack table lock,
1539 * so there's no need to increase the refcount */
1540 err = -EEXIST;
1541 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1542 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1543
1544 err = ctnetlink_change_conntrack(ct, cda);
1545 if (err == 0) {
1546 nf_conntrack_get(&ct->ct_general);
1547 spin_unlock_bh(&nf_conntrack_lock);
1548 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1549 (1 << IPCT_ASSURED) |
1550 (1 << IPCT_HELPER) |
1551 (1 << IPCT_PROTOINFO) |
1552 (1 << IPCT_NATSEQADJ) |
1553 (1 << IPCT_MARK),
1554 ct, NETLINK_CB(skb).pid,
1555 nlmsg_report(nlh));
1556 nf_ct_put(ct);
1557 } else
1558 spin_unlock_bh(&nf_conntrack_lock);
1559
1560 return err;
1561 }
1562
1563 out_unlock:
1564 spin_unlock_bh(&nf_conntrack_lock);
1565 return err;
1566 }
1567
1568 /***********************************************************************
1569 * EXPECT
1570 ***********************************************************************/
1571
1572 static inline int
1573 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1574 const struct nf_conntrack_tuple *tuple,
1575 enum ctattr_expect type)
1576 {
1577 struct nlattr *nest_parms;
1578
1579 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1580 if (!nest_parms)
1581 goto nla_put_failure;
1582 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1583 goto nla_put_failure;
1584 nla_nest_end(skb, nest_parms);
1585
1586 return 0;
1587
1588 nla_put_failure:
1589 return -1;
1590 }
1591
1592 static inline int
1593 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1594 const struct nf_conntrack_tuple *tuple,
1595 const struct nf_conntrack_tuple_mask *mask)
1596 {
1597 int ret;
1598 struct nf_conntrack_l3proto *l3proto;
1599 struct nf_conntrack_l4proto *l4proto;
1600 struct nf_conntrack_tuple m;
1601 struct nlattr *nest_parms;
1602
1603 memset(&m, 0xFF, sizeof(m));
1604 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1605 m.src.u.all = mask->src.u.all;
1606 m.dst.protonum = tuple->dst.protonum;
1607
1608 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1609 if (!nest_parms)
1610 goto nla_put_failure;
1611
1612 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1613 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1614
1615 if (unlikely(ret < 0))
1616 goto nla_put_failure;
1617
1618 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1619 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1620 if (unlikely(ret < 0))
1621 goto nla_put_failure;
1622
1623 nla_nest_end(skb, nest_parms);
1624
1625 return 0;
1626
1627 nla_put_failure:
1628 return -1;
1629 }
1630
1631 static int
1632 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1633 const struct nf_conntrack_expect *exp)
1634 {
1635 struct nf_conn *master = exp->master;
1636 long timeout = (exp->timeout.expires - jiffies) / HZ;
1637 struct nf_conn_help *help;
1638
1639 if (timeout < 0)
1640 timeout = 0;
1641
1642 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1643 goto nla_put_failure;
1644 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1645 goto nla_put_failure;
1646 if (ctnetlink_exp_dump_tuple(skb,
1647 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1648 CTA_EXPECT_MASTER) < 0)
1649 goto nla_put_failure;
1650
1651 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1652 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1653 NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1654 help = nfct_help(master);
1655 if (help) {
1656 struct nf_conntrack_helper *helper;
1657
1658 helper = rcu_dereference(help->helper);
1659 if (helper)
1660 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1661 }
1662
1663 return 0;
1664
1665 nla_put_failure:
1666 return -1;
1667 }
1668
1669 static int
1670 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1671 int event, const struct nf_conntrack_expect *exp)
1672 {
1673 struct nlmsghdr *nlh;
1674 struct nfgenmsg *nfmsg;
1675 unsigned int flags = pid ? NLM_F_MULTI : 0;
1676
1677 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1678 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1679 if (nlh == NULL)
1680 goto nlmsg_failure;
1681
1682 nfmsg = nlmsg_data(nlh);
1683 nfmsg->nfgen_family = exp->tuple.src.l3num;
1684 nfmsg->version = NFNETLINK_V0;
1685 nfmsg->res_id = 0;
1686
1687 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1688 goto nla_put_failure;
1689
1690 nlmsg_end(skb, nlh);
1691 return skb->len;
1692
1693 nlmsg_failure:
1694 nla_put_failure:
1695 nlmsg_cancel(skb, nlh);
1696 return -1;
1697 }
1698
1699 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1700 static int
1701 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1702 {
1703 struct nf_conntrack_expect *exp = item->exp;
1704 struct net *net = nf_ct_exp_net(exp);
1705 struct nlmsghdr *nlh;
1706 struct nfgenmsg *nfmsg;
1707 struct sk_buff *skb;
1708 unsigned int type, group;
1709 int flags = 0;
1710
1711 if (events & (1 << IPEXP_DESTROY)) {
1712 type = IPCTNL_MSG_EXP_DELETE;
1713 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1714 } else if (events & (1 << IPEXP_NEW)) {
1715 type = IPCTNL_MSG_EXP_NEW;
1716 flags = NLM_F_CREATE|NLM_F_EXCL;
1717 group = NFNLGRP_CONNTRACK_EXP_NEW;
1718 } else
1719 return 0;
1720
1721 if (!item->report && !nfnetlink_has_listeners(net, group))
1722 return 0;
1723
1724 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1725 if (skb == NULL)
1726 goto errout;
1727
1728 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1729 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1730 if (nlh == NULL)
1731 goto nlmsg_failure;
1732
1733 nfmsg = nlmsg_data(nlh);
1734 nfmsg->nfgen_family = exp->tuple.src.l3num;
1735 nfmsg->version = NFNETLINK_V0;
1736 nfmsg->res_id = 0;
1737
1738 rcu_read_lock();
1739 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1740 goto nla_put_failure;
1741 rcu_read_unlock();
1742
1743 nlmsg_end(skb, nlh);
1744 nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1745 return 0;
1746
1747 nla_put_failure:
1748 rcu_read_unlock();
1749 nlmsg_cancel(skb, nlh);
1750 nlmsg_failure:
1751 kfree_skb(skb);
1752 errout:
1753 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1754 return 0;
1755 }
1756 #endif
1757 static int ctnetlink_exp_done(struct netlink_callback *cb)
1758 {
1759 if (cb->args[1])
1760 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1761 return 0;
1762 }
1763
1764 static int
1765 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1766 {
1767 struct net *net = sock_net(skb->sk);
1768 struct nf_conntrack_expect *exp, *last;
1769 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1770 struct hlist_node *n;
1771 u_int8_t l3proto = nfmsg->nfgen_family;
1772
1773 rcu_read_lock();
1774 last = (struct nf_conntrack_expect *)cb->args[1];
1775 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1776 restart:
1777 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1778 hnode) {
1779 if (l3proto && exp->tuple.src.l3num != l3proto)
1780 continue;
1781 if (cb->args[1]) {
1782 if (exp != last)
1783 continue;
1784 cb->args[1] = 0;
1785 }
1786 if (ctnetlink_exp_fill_info(skb,
1787 NETLINK_CB(cb->skb).pid,
1788 cb->nlh->nlmsg_seq,
1789 IPCTNL_MSG_EXP_NEW,
1790 exp) < 0) {
1791 if (!atomic_inc_not_zero(&exp->use))
1792 continue;
1793 cb->args[1] = (unsigned long)exp;
1794 goto out;
1795 }
1796 }
1797 if (cb->args[1]) {
1798 cb->args[1] = 0;
1799 goto restart;
1800 }
1801 }
1802 out:
1803 rcu_read_unlock();
1804 if (last)
1805 nf_ct_expect_put(last);
1806
1807 return skb->len;
1808 }
1809
1810 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1811 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1812 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1813 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1814 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1815 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1816 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1817 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
1818 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
1819 };
1820
1821 static int
1822 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1823 const struct nlmsghdr *nlh,
1824 const struct nlattr * const cda[])
1825 {
1826 struct net *net = sock_net(ctnl);
1827 struct nf_conntrack_tuple tuple;
1828 struct nf_conntrack_expect *exp;
1829 struct sk_buff *skb2;
1830 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1831 u_int8_t u3 = nfmsg->nfgen_family;
1832 u16 zone;
1833 int err;
1834
1835 if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
1836 return netlink_dump_start(ctnl, skb, nlh,
1837 ctnetlink_exp_dump_table,
1838 ctnetlink_exp_done);
1839 }
1840
1841 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1842 if (err < 0)
1843 return err;
1844
1845 if (cda[CTA_EXPECT_MASTER])
1846 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1847 else
1848 return -EINVAL;
1849
1850 if (err < 0)
1851 return err;
1852
1853 exp = nf_ct_expect_find_get(net, zone, &tuple);
1854 if (!exp)
1855 return -ENOENT;
1856
1857 if (cda[CTA_EXPECT_ID]) {
1858 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1859 if (ntohl(id) != (u32)(unsigned long)exp) {
1860 nf_ct_expect_put(exp);
1861 return -ENOENT;
1862 }
1863 }
1864
1865 err = -ENOMEM;
1866 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1867 if (skb2 == NULL)
1868 goto out;
1869
1870 rcu_read_lock();
1871 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1872 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1873 rcu_read_unlock();
1874 if (err <= 0)
1875 goto free;
1876
1877 nf_ct_expect_put(exp);
1878
1879 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1880
1881 free:
1882 kfree_skb(skb2);
1883 out:
1884 nf_ct_expect_put(exp);
1885 return err;
1886 }
1887
1888 static int
1889 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1890 const struct nlmsghdr *nlh,
1891 const struct nlattr * const cda[])
1892 {
1893 struct net *net = sock_net(ctnl);
1894 struct nf_conntrack_expect *exp;
1895 struct nf_conntrack_tuple tuple;
1896 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1897 struct hlist_node *n, *next;
1898 u_int8_t u3 = nfmsg->nfgen_family;
1899 unsigned int i;
1900 u16 zone;
1901 int err;
1902
1903 if (cda[CTA_EXPECT_TUPLE]) {
1904 /* delete a single expect by tuple */
1905 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1906 if (err < 0)
1907 return err;
1908
1909 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1910 if (err < 0)
1911 return err;
1912
1913 /* bump usage count to 2 */
1914 exp = nf_ct_expect_find_get(net, zone, &tuple);
1915 if (!exp)
1916 return -ENOENT;
1917
1918 if (cda[CTA_EXPECT_ID]) {
1919 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1920 if (ntohl(id) != (u32)(unsigned long)exp) {
1921 nf_ct_expect_put(exp);
1922 return -ENOENT;
1923 }
1924 }
1925
1926 /* after list removal, usage count == 1 */
1927 spin_lock_bh(&nf_conntrack_lock);
1928 if (del_timer(&exp->timeout)) {
1929 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1930 nlmsg_report(nlh));
1931 nf_ct_expect_put(exp);
1932 }
1933 spin_unlock_bh(&nf_conntrack_lock);
1934 /* have to put what we 'get' above.
1935 * after this line usage count == 0 */
1936 nf_ct_expect_put(exp);
1937 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1938 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1939 struct nf_conn_help *m_help;
1940
1941 /* delete all expectations for this helper */
1942 spin_lock_bh(&nf_conntrack_lock);
1943 for (i = 0; i < nf_ct_expect_hsize; i++) {
1944 hlist_for_each_entry_safe(exp, n, next,
1945 &net->ct.expect_hash[i],
1946 hnode) {
1947 m_help = nfct_help(exp->master);
1948 if (!strcmp(m_help->helper->name, name) &&
1949 del_timer(&exp->timeout)) {
1950 nf_ct_unlink_expect_report(exp,
1951 NETLINK_CB(skb).pid,
1952 nlmsg_report(nlh));
1953 nf_ct_expect_put(exp);
1954 }
1955 }
1956 }
1957 spin_unlock_bh(&nf_conntrack_lock);
1958 } else {
1959 /* This basically means we have to flush everything*/
1960 spin_lock_bh(&nf_conntrack_lock);
1961 for (i = 0; i < nf_ct_expect_hsize; i++) {
1962 hlist_for_each_entry_safe(exp, n, next,
1963 &net->ct.expect_hash[i],
1964 hnode) {
1965 if (del_timer(&exp->timeout)) {
1966 nf_ct_unlink_expect_report(exp,
1967 NETLINK_CB(skb).pid,
1968 nlmsg_report(nlh));
1969 nf_ct_expect_put(exp);
1970 }
1971 }
1972 }
1973 spin_unlock_bh(&nf_conntrack_lock);
1974 }
1975
1976 return 0;
1977 }
1978 static int
1979 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1980 const struct nlattr * const cda[])
1981 {
1982 return -EOPNOTSUPP;
1983 }
1984
1985 static int
1986 ctnetlink_create_expect(struct net *net, u16 zone,
1987 const struct nlattr * const cda[],
1988 u_int8_t u3,
1989 u32 pid, int report)
1990 {
1991 struct nf_conntrack_tuple tuple, mask, master_tuple;
1992 struct nf_conntrack_tuple_hash *h = NULL;
1993 struct nf_conntrack_expect *exp;
1994 struct nf_conn *ct;
1995 struct nf_conn_help *help;
1996 int err = 0;
1997
1998 /* caller guarantees that those three CTA_EXPECT_* exist */
1999 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2000 if (err < 0)
2001 return err;
2002 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2003 if (err < 0)
2004 return err;
2005 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2006 if (err < 0)
2007 return err;
2008
2009 /* Look for master conntrack of this expectation */
2010 h = nf_conntrack_find_get(net, zone, &master_tuple);
2011 if (!h)
2012 return -ENOENT;
2013 ct = nf_ct_tuplehash_to_ctrack(h);
2014 exp = nf_ct_expect_alloc(ct);
2015 if (!exp) {
2016 err = -ENOMEM;
2017 goto out;
2018 }
2019 help = nfct_help(ct);
2020 if (!help) {
2021 if (!cda[CTA_EXPECT_TIMEOUT]) {
2022 err = -EINVAL;
2023 goto out;
2024 }
2025 exp->timeout.expires =
2026 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2027
2028 exp->flags = NF_CT_EXPECT_USERSPACE;
2029 if (cda[CTA_EXPECT_FLAGS]) {
2030 exp->flags |=
2031 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2032 }
2033 } else {
2034 if (cda[CTA_EXPECT_FLAGS]) {
2035 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2036 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2037 } else
2038 exp->flags = 0;
2039 }
2040
2041 exp->class = 0;
2042 exp->expectfn = NULL;
2043 exp->master = ct;
2044 exp->helper = NULL;
2045 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2046 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2047 exp->mask.src.u.all = mask.src.u.all;
2048
2049 err = nf_ct_expect_related_report(exp, pid, report);
2050 nf_ct_expect_put(exp);
2051
2052 out:
2053 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2054 return err;
2055 }
2056
2057 static int
2058 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2059 const struct nlmsghdr *nlh,
2060 const struct nlattr * const cda[])
2061 {
2062 struct net *net = sock_net(ctnl);
2063 struct nf_conntrack_tuple tuple;
2064 struct nf_conntrack_expect *exp;
2065 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2066 u_int8_t u3 = nfmsg->nfgen_family;
2067 u16 zone;
2068 int err;
2069
2070 if (!cda[CTA_EXPECT_TUPLE]
2071 || !cda[CTA_EXPECT_MASK]
2072 || !cda[CTA_EXPECT_MASTER])
2073 return -EINVAL;
2074
2075 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2076 if (err < 0)
2077 return err;
2078
2079 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2080 if (err < 0)
2081 return err;
2082
2083 spin_lock_bh(&nf_conntrack_lock);
2084 exp = __nf_ct_expect_find(net, zone, &tuple);
2085
2086 if (!exp) {
2087 spin_unlock_bh(&nf_conntrack_lock);
2088 err = -ENOENT;
2089 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2090 err = ctnetlink_create_expect(net, zone, cda,
2091 u3,
2092 NETLINK_CB(skb).pid,
2093 nlmsg_report(nlh));
2094 }
2095 return err;
2096 }
2097
2098 err = -EEXIST;
2099 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2100 err = ctnetlink_change_expect(exp, cda);
2101 spin_unlock_bh(&nf_conntrack_lock);
2102
2103 return err;
2104 }
2105
2106 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2107 static struct nf_ct_event_notifier ctnl_notifier = {
2108 .fcn = ctnetlink_conntrack_event,
2109 };
2110
2111 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2112 .fcn = ctnetlink_expect_event,
2113 };
2114 #endif
2115
2116 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2117 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2118 .attr_count = CTA_MAX,
2119 .policy = ct_nla_policy },
2120 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2121 .attr_count = CTA_MAX,
2122 .policy = ct_nla_policy },
2123 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2124 .attr_count = CTA_MAX,
2125 .policy = ct_nla_policy },
2126 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2127 .attr_count = CTA_MAX,
2128 .policy = ct_nla_policy },
2129 };
2130
2131 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2132 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2133 .attr_count = CTA_EXPECT_MAX,
2134 .policy = exp_nla_policy },
2135 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2136 .attr_count = CTA_EXPECT_MAX,
2137 .policy = exp_nla_policy },
2138 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2139 .attr_count = CTA_EXPECT_MAX,
2140 .policy = exp_nla_policy },
2141 };
2142
2143 static const struct nfnetlink_subsystem ctnl_subsys = {
2144 .name = "conntrack",
2145 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2146 .cb_count = IPCTNL_MSG_MAX,
2147 .cb = ctnl_cb,
2148 };
2149
2150 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2151 .name = "conntrack_expect",
2152 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2153 .cb_count = IPCTNL_MSG_EXP_MAX,
2154 .cb = ctnl_exp_cb,
2155 };
2156
2157 MODULE_ALIAS("ip_conntrack_netlink");
2158 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2159 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2160
2161 static int __init ctnetlink_init(void)
2162 {
2163 int ret;
2164
2165 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2166 ret = nfnetlink_subsys_register(&ctnl_subsys);
2167 if (ret < 0) {
2168 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2169 goto err_out;
2170 }
2171
2172 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2173 if (ret < 0) {
2174 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2175 goto err_unreg_subsys;
2176 }
2177
2178 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2179 ret = nf_conntrack_register_notifier(&ctnl_notifier);
2180 if (ret < 0) {
2181 pr_err("ctnetlink_init: cannot register notifier.\n");
2182 goto err_unreg_exp_subsys;
2183 }
2184
2185 ret = nf_ct_expect_register_notifier(&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
2192 return 0;
2193
2194 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2195 err_unreg_notifier:
2196 nf_conntrack_unregister_notifier(&ctnl_notifier);
2197 err_unreg_exp_subsys:
2198 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2199 #endif
2200 err_unreg_subsys:
2201 nfnetlink_subsys_unregister(&ctnl_subsys);
2202 err_out:
2203 return ret;
2204 }
2205
2206 static void __exit ctnetlink_exit(void)
2207 {
2208 pr_info("ctnetlink: unregistering from nfnetlink.\n");
2209
2210 nf_ct_remove_userspace_expectations();
2211 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2212 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2213 nf_conntrack_unregister_notifier(&ctnl_notifier);
2214 #endif
2215
2216 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2217 nfnetlink_subsys_unregister(&ctnl_subsys);
2218 }
2219
2220 module_init(ctnetlink_init);
2221 module_exit(ctnetlink_exit);