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[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 = ((long)ct->timeout.expires - (long)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 dump_counters(struct sk_buff *skb, u64 pkts, u64 bytes,
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
212 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
213 if (!nest_count)
214 goto nla_put_failure;
215
216 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts));
217 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes));
218
219 nla_nest_end(skb, nest_count);
220
221 return 0;
222
223 nla_put_failure:
224 return -1;
225 }
226
227 static int
228 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
229 enum ip_conntrack_dir dir, int type)
230 {
231 struct nf_conn_counter *acct;
232 u64 pkts, bytes;
233
234 acct = nf_conn_acct_find(ct);
235 if (!acct)
236 return 0;
237
238 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
239 pkts = atomic64_xchg(&acct[dir].packets, 0);
240 bytes = atomic64_xchg(&acct[dir].bytes, 0);
241 } else {
242 pkts = atomic64_read(&acct[dir].packets);
243 bytes = atomic64_read(&acct[dir].bytes);
244 }
245 return dump_counters(skb, pkts, bytes, dir);
246 }
247
248 static int
249 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
250 {
251 struct nlattr *nest_count;
252 const struct nf_conn_tstamp *tstamp;
253
254 tstamp = nf_conn_tstamp_find(ct);
255 if (!tstamp)
256 return 0;
257
258 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
259 if (!nest_count)
260 goto nla_put_failure;
261
262 NLA_PUT_BE64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start));
263 if (tstamp->stop != 0) {
264 NLA_PUT_BE64(skb, CTA_TIMESTAMP_STOP,
265 cpu_to_be64(tstamp->stop));
266 }
267 nla_nest_end(skb, nest_count);
268
269 return 0;
270
271 nla_put_failure:
272 return -1;
273 }
274
275 #ifdef CONFIG_NF_CONNTRACK_MARK
276 static inline int
277 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
278 {
279 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
280 return 0;
281
282 nla_put_failure:
283 return -1;
284 }
285 #else
286 #define ctnetlink_dump_mark(a, b) (0)
287 #endif
288
289 #ifdef CONFIG_NF_CONNTRACK_SECMARK
290 static inline int
291 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
292 {
293 struct nlattr *nest_secctx;
294 int len, ret;
295 char *secctx;
296
297 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
298 if (ret)
299 return 0;
300
301 ret = -1;
302 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
303 if (!nest_secctx)
304 goto nla_put_failure;
305
306 NLA_PUT_STRING(skb, CTA_SECCTX_NAME, secctx);
307 nla_nest_end(skb, nest_secctx);
308
309 ret = 0;
310 nla_put_failure:
311 security_release_secctx(secctx, len);
312 return ret;
313 }
314 #else
315 #define ctnetlink_dump_secctx(a, b) (0)
316 #endif
317
318 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
319
320 static inline int
321 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
322 {
323 struct nlattr *nest_parms;
324
325 if (!(ct->status & IPS_EXPECTED))
326 return 0;
327
328 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
329 if (!nest_parms)
330 goto nla_put_failure;
331 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
332 goto nla_put_failure;
333 nla_nest_end(skb, nest_parms);
334
335 return 0;
336
337 nla_put_failure:
338 return -1;
339 }
340
341 #ifdef CONFIG_NF_NAT_NEEDED
342 static int
343 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
344 {
345 struct nlattr *nest_parms;
346
347 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
348 if (!nest_parms)
349 goto nla_put_failure;
350
351 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
352 htonl(natseq->correction_pos));
353 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
354 htonl(natseq->offset_before));
355 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
356 htonl(natseq->offset_after));
357
358 nla_nest_end(skb, nest_parms);
359
360 return 0;
361
362 nla_put_failure:
363 return -1;
364 }
365
366 static inline int
367 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
368 {
369 struct nf_nat_seq *natseq;
370 struct nf_conn_nat *nat = nfct_nat(ct);
371
372 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
373 return 0;
374
375 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
376 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
377 return -1;
378
379 natseq = &nat->seq[IP_CT_DIR_REPLY];
380 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
381 return -1;
382
383 return 0;
384 }
385 #else
386 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
387 #endif
388
389 static inline int
390 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
391 {
392 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
393 return 0;
394
395 nla_put_failure:
396 return -1;
397 }
398
399 static inline int
400 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
401 {
402 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
403 return 0;
404
405 nla_put_failure:
406 return -1;
407 }
408
409 static int
410 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq, u32 type,
411 struct nf_conn *ct)
412 {
413 struct nlmsghdr *nlh;
414 struct nfgenmsg *nfmsg;
415 struct nlattr *nest_parms;
416 unsigned int flags = pid ? NLM_F_MULTI : 0, event;
417
418 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
419 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
420 if (nlh == NULL)
421 goto nlmsg_failure;
422
423 nfmsg = nlmsg_data(nlh);
424 nfmsg->nfgen_family = nf_ct_l3num(ct);
425 nfmsg->version = NFNETLINK_V0;
426 nfmsg->res_id = 0;
427
428 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
429 if (!nest_parms)
430 goto nla_put_failure;
431 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
432 goto nla_put_failure;
433 nla_nest_end(skb, nest_parms);
434
435 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
436 if (!nest_parms)
437 goto nla_put_failure;
438 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
439 goto nla_put_failure;
440 nla_nest_end(skb, nest_parms);
441
442 if (nf_ct_zone(ct))
443 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
444
445 if (ctnetlink_dump_status(skb, ct) < 0 ||
446 ctnetlink_dump_timeout(skb, ct) < 0 ||
447 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL, type) < 0 ||
448 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY, type) < 0 ||
449 ctnetlink_dump_timestamp(skb, ct) < 0 ||
450 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
451 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
452 ctnetlink_dump_mark(skb, ct) < 0 ||
453 ctnetlink_dump_secctx(skb, ct) < 0 ||
454 ctnetlink_dump_id(skb, ct) < 0 ||
455 ctnetlink_dump_use(skb, ct) < 0 ||
456 ctnetlink_dump_master(skb, ct) < 0 ||
457 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
458 goto nla_put_failure;
459
460 nlmsg_end(skb, nlh);
461 return skb->len;
462
463 nlmsg_failure:
464 nla_put_failure:
465 nlmsg_cancel(skb, nlh);
466 return -1;
467 }
468
469 #ifdef CONFIG_NF_CONNTRACK_EVENTS
470 static inline size_t
471 ctnetlink_proto_size(const struct nf_conn *ct)
472 {
473 struct nf_conntrack_l3proto *l3proto;
474 struct nf_conntrack_l4proto *l4proto;
475 size_t len = 0;
476
477 rcu_read_lock();
478 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
479 len += l3proto->nla_size;
480
481 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
482 len += l4proto->nla_size;
483 rcu_read_unlock();
484
485 return len;
486 }
487
488 static inline size_t
489 ctnetlink_counters_size(const struct nf_conn *ct)
490 {
491 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
492 return 0;
493 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
494 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
495 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
496 ;
497 }
498
499 static inline int
500 ctnetlink_secctx_size(const struct nf_conn *ct)
501 {
502 #ifdef CONFIG_NF_CONNTRACK_SECMARK
503 int len, ret;
504
505 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
506 if (ret)
507 return 0;
508
509 return nla_total_size(0) /* CTA_SECCTX */
510 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
511 #else
512 return 0;
513 #endif
514 }
515
516 static inline size_t
517 ctnetlink_timestamp_size(const struct nf_conn *ct)
518 {
519 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
520 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
521 return 0;
522 return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
523 #else
524 return 0;
525 #endif
526 }
527
528 static inline size_t
529 ctnetlink_nlmsg_size(const struct nf_conn *ct)
530 {
531 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
532 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
533 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
534 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
535 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
536 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
537 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
538 + ctnetlink_counters_size(ct)
539 + ctnetlink_timestamp_size(ct)
540 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
541 + nla_total_size(0) /* CTA_PROTOINFO */
542 + nla_total_size(0) /* CTA_HELP */
543 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
544 + ctnetlink_secctx_size(ct)
545 #ifdef CONFIG_NF_NAT_NEEDED
546 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
547 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
548 #endif
549 #ifdef CONFIG_NF_CONNTRACK_MARK
550 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
551 #endif
552 + ctnetlink_proto_size(ct)
553 ;
554 }
555
556 static int
557 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
558 {
559 struct net *net;
560 struct nlmsghdr *nlh;
561 struct nfgenmsg *nfmsg;
562 struct nlattr *nest_parms;
563 struct nf_conn *ct = item->ct;
564 struct sk_buff *skb;
565 unsigned int type;
566 unsigned int flags = 0, group;
567 int err;
568
569 /* ignore our fake conntrack entry */
570 if (nf_ct_is_untracked(ct))
571 return 0;
572
573 if (events & (1 << IPCT_DESTROY)) {
574 type = IPCTNL_MSG_CT_DELETE;
575 group = NFNLGRP_CONNTRACK_DESTROY;
576 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
577 type = IPCTNL_MSG_CT_NEW;
578 flags = NLM_F_CREATE|NLM_F_EXCL;
579 group = NFNLGRP_CONNTRACK_NEW;
580 } else if (events) {
581 type = IPCTNL_MSG_CT_NEW;
582 group = NFNLGRP_CONNTRACK_UPDATE;
583 } else
584 return 0;
585
586 net = nf_ct_net(ct);
587 if (!item->report && !nfnetlink_has_listeners(net, group))
588 return 0;
589
590 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
591 if (skb == NULL)
592 goto errout;
593
594 type |= NFNL_SUBSYS_CTNETLINK << 8;
595 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
596 if (nlh == NULL)
597 goto nlmsg_failure;
598
599 nfmsg = nlmsg_data(nlh);
600 nfmsg->nfgen_family = nf_ct_l3num(ct);
601 nfmsg->version = NFNETLINK_V0;
602 nfmsg->res_id = 0;
603
604 rcu_read_lock();
605 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
606 if (!nest_parms)
607 goto nla_put_failure;
608 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
609 goto nla_put_failure;
610 nla_nest_end(skb, nest_parms);
611
612 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
613 if (!nest_parms)
614 goto nla_put_failure;
615 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
616 goto nla_put_failure;
617 nla_nest_end(skb, nest_parms);
618
619 if (nf_ct_zone(ct))
620 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
621
622 if (ctnetlink_dump_id(skb, ct) < 0)
623 goto nla_put_failure;
624
625 if (ctnetlink_dump_status(skb, ct) < 0)
626 goto nla_put_failure;
627
628 if (events & (1 << IPCT_DESTROY)) {
629 if (ctnetlink_dump_counters(skb, ct,
630 IP_CT_DIR_ORIGINAL, type) < 0 ||
631 ctnetlink_dump_counters(skb, ct,
632 IP_CT_DIR_REPLY, type) < 0 ||
633 ctnetlink_dump_timestamp(skb, ct) < 0)
634 goto nla_put_failure;
635 } else {
636 if (ctnetlink_dump_timeout(skb, ct) < 0)
637 goto nla_put_failure;
638
639 if (events & (1 << IPCT_PROTOINFO)
640 && ctnetlink_dump_protoinfo(skb, ct) < 0)
641 goto nla_put_failure;
642
643 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
644 && ctnetlink_dump_helpinfo(skb, ct) < 0)
645 goto nla_put_failure;
646
647 #ifdef CONFIG_NF_CONNTRACK_SECMARK
648 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
649 && ctnetlink_dump_secctx(skb, ct) < 0)
650 goto nla_put_failure;
651 #endif
652
653 if (events & (1 << IPCT_RELATED) &&
654 ctnetlink_dump_master(skb, ct) < 0)
655 goto nla_put_failure;
656
657 if (events & (1 << IPCT_NATSEQADJ) &&
658 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
659 goto nla_put_failure;
660 }
661
662 #ifdef CONFIG_NF_CONNTRACK_MARK
663 if ((events & (1 << IPCT_MARK) || ct->mark)
664 && ctnetlink_dump_mark(skb, ct) < 0)
665 goto nla_put_failure;
666 #endif
667 rcu_read_unlock();
668
669 nlmsg_end(skb, nlh);
670 err = nfnetlink_send(skb, net, item->pid, group, item->report,
671 GFP_ATOMIC);
672 if (err == -ENOBUFS || err == -EAGAIN)
673 return -ENOBUFS;
674
675 return 0;
676
677 nla_put_failure:
678 rcu_read_unlock();
679 nlmsg_cancel(skb, nlh);
680 nlmsg_failure:
681 kfree_skb(skb);
682 errout:
683 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
684 return -ENOBUFS;
685
686 return 0;
687 }
688 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
689
690 static int ctnetlink_done(struct netlink_callback *cb)
691 {
692 if (cb->args[1])
693 nf_ct_put((struct nf_conn *)cb->args[1]);
694 return 0;
695 }
696
697 static int
698 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
699 {
700 struct net *net = sock_net(skb->sk);
701 struct nf_conn *ct, *last;
702 struct nf_conntrack_tuple_hash *h;
703 struct hlist_nulls_node *n;
704 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
705 u_int8_t l3proto = nfmsg->nfgen_family;
706
707 spin_lock_bh(&nf_conntrack_lock);
708 last = (struct nf_conn *)cb->args[1];
709 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
710 restart:
711 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
712 hnnode) {
713 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
714 continue;
715 ct = nf_ct_tuplehash_to_ctrack(h);
716 /* Dump entries of a given L3 protocol number.
717 * If it is not specified, ie. l3proto == 0,
718 * then dump everything. */
719 if (l3proto && nf_ct_l3num(ct) != l3proto)
720 continue;
721 if (cb->args[1]) {
722 if (ct != last)
723 continue;
724 cb->args[1] = 0;
725 }
726 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
727 cb->nlh->nlmsg_seq,
728 NFNL_MSG_TYPE(
729 cb->nlh->nlmsg_type),
730 ct) < 0) {
731 nf_conntrack_get(&ct->ct_general);
732 cb->args[1] = (unsigned long)ct;
733 goto out;
734 }
735 }
736 if (cb->args[1]) {
737 cb->args[1] = 0;
738 goto restart;
739 }
740 }
741 out:
742 spin_unlock_bh(&nf_conntrack_lock);
743 if (last)
744 nf_ct_put(last);
745
746 return skb->len;
747 }
748
749 static inline int
750 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
751 {
752 struct nlattr *tb[CTA_IP_MAX+1];
753 struct nf_conntrack_l3proto *l3proto;
754 int ret = 0;
755
756 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
757
758 rcu_read_lock();
759 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
760
761 if (likely(l3proto->nlattr_to_tuple)) {
762 ret = nla_validate_nested(attr, CTA_IP_MAX,
763 l3proto->nla_policy);
764 if (ret == 0)
765 ret = l3proto->nlattr_to_tuple(tb, tuple);
766 }
767
768 rcu_read_unlock();
769
770 return ret;
771 }
772
773 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
774 [CTA_PROTO_NUM] = { .type = NLA_U8 },
775 };
776
777 static inline int
778 ctnetlink_parse_tuple_proto(struct nlattr *attr,
779 struct nf_conntrack_tuple *tuple)
780 {
781 struct nlattr *tb[CTA_PROTO_MAX+1];
782 struct nf_conntrack_l4proto *l4proto;
783 int ret = 0;
784
785 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
786 if (ret < 0)
787 return ret;
788
789 if (!tb[CTA_PROTO_NUM])
790 return -EINVAL;
791 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
792
793 rcu_read_lock();
794 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
795
796 if (likely(l4proto->nlattr_to_tuple)) {
797 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
798 l4proto->nla_policy);
799 if (ret == 0)
800 ret = l4proto->nlattr_to_tuple(tb, tuple);
801 }
802
803 rcu_read_unlock();
804
805 return ret;
806 }
807
808 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
809 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
810 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
811 };
812
813 static int
814 ctnetlink_parse_tuple(const struct nlattr * const cda[],
815 struct nf_conntrack_tuple *tuple,
816 enum ctattr_type type, u_int8_t l3num)
817 {
818 struct nlattr *tb[CTA_TUPLE_MAX+1];
819 int err;
820
821 memset(tuple, 0, sizeof(*tuple));
822
823 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
824
825 if (!tb[CTA_TUPLE_IP])
826 return -EINVAL;
827
828 tuple->src.l3num = l3num;
829
830 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
831 if (err < 0)
832 return err;
833
834 if (!tb[CTA_TUPLE_PROTO])
835 return -EINVAL;
836
837 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
838 if (err < 0)
839 return err;
840
841 /* orig and expect tuples get DIR_ORIGINAL */
842 if (type == CTA_TUPLE_REPLY)
843 tuple->dst.dir = IP_CT_DIR_REPLY;
844 else
845 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
846
847 return 0;
848 }
849
850 static int
851 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
852 {
853 if (attr)
854 #ifdef CONFIG_NF_CONNTRACK_ZONES
855 *zone = ntohs(nla_get_be16(attr));
856 #else
857 return -EOPNOTSUPP;
858 #endif
859 else
860 *zone = 0;
861
862 return 0;
863 }
864
865 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
866 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
867 };
868
869 static inline int
870 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
871 {
872 struct nlattr *tb[CTA_HELP_MAX+1];
873
874 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
875
876 if (!tb[CTA_HELP_NAME])
877 return -EINVAL;
878
879 *helper_name = nla_data(tb[CTA_HELP_NAME]);
880
881 return 0;
882 }
883
884 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
885 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
886 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
887 [CTA_STATUS] = { .type = NLA_U32 },
888 [CTA_PROTOINFO] = { .type = NLA_NESTED },
889 [CTA_HELP] = { .type = NLA_NESTED },
890 [CTA_NAT_SRC] = { .type = NLA_NESTED },
891 [CTA_TIMEOUT] = { .type = NLA_U32 },
892 [CTA_MARK] = { .type = NLA_U32 },
893 [CTA_ID] = { .type = NLA_U32 },
894 [CTA_NAT_DST] = { .type = NLA_NESTED },
895 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
896 [CTA_ZONE] = { .type = NLA_U16 },
897 };
898
899 static int
900 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
901 const struct nlmsghdr *nlh,
902 const struct nlattr * const cda[])
903 {
904 struct net *net = sock_net(ctnl);
905 struct nf_conntrack_tuple_hash *h;
906 struct nf_conntrack_tuple tuple;
907 struct nf_conn *ct;
908 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
909 u_int8_t u3 = nfmsg->nfgen_family;
910 u16 zone;
911 int err;
912
913 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
914 if (err < 0)
915 return err;
916
917 if (cda[CTA_TUPLE_ORIG])
918 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
919 else if (cda[CTA_TUPLE_REPLY])
920 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
921 else {
922 /* Flush the whole table */
923 nf_conntrack_flush_report(net,
924 NETLINK_CB(skb).pid,
925 nlmsg_report(nlh));
926 return 0;
927 }
928
929 if (err < 0)
930 return err;
931
932 h = nf_conntrack_find_get(net, zone, &tuple);
933 if (!h)
934 return -ENOENT;
935
936 ct = nf_ct_tuplehash_to_ctrack(h);
937
938 if (cda[CTA_ID]) {
939 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
940 if (id != (u32)(unsigned long)ct) {
941 nf_ct_put(ct);
942 return -ENOENT;
943 }
944 }
945
946 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
947 NETLINK_CB(skb).pid,
948 nlmsg_report(nlh)) < 0) {
949 nf_ct_delete_from_lists(ct);
950 /* we failed to report the event, try later */
951 nf_ct_insert_dying_list(ct);
952 nf_ct_put(ct);
953 return 0;
954 }
955
956 /* death_by_timeout would report the event again */
957 set_bit(IPS_DYING_BIT, &ct->status);
958
959 nf_ct_kill(ct);
960 nf_ct_put(ct);
961
962 return 0;
963 }
964
965 static int
966 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
967 const struct nlmsghdr *nlh,
968 const struct nlattr * const cda[])
969 {
970 struct net *net = sock_net(ctnl);
971 struct nf_conntrack_tuple_hash *h;
972 struct nf_conntrack_tuple tuple;
973 struct nf_conn *ct;
974 struct sk_buff *skb2 = NULL;
975 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
976 u_int8_t u3 = nfmsg->nfgen_family;
977 u16 zone;
978 int err;
979
980 if (nlh->nlmsg_flags & NLM_F_DUMP) {
981 struct netlink_dump_control c = {
982 .dump = ctnetlink_dump_table,
983 .done = ctnetlink_done,
984 };
985 return netlink_dump_start(ctnl, skb, nlh, &c);
986 }
987
988 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
989 if (err < 0)
990 return err;
991
992 if (cda[CTA_TUPLE_ORIG])
993 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
994 else if (cda[CTA_TUPLE_REPLY])
995 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
996 else
997 return -EINVAL;
998
999 if (err < 0)
1000 return err;
1001
1002 h = nf_conntrack_find_get(net, zone, &tuple);
1003 if (!h)
1004 return -ENOENT;
1005
1006 ct = nf_ct_tuplehash_to_ctrack(h);
1007
1008 err = -ENOMEM;
1009 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1010 if (skb2 == NULL) {
1011 nf_ct_put(ct);
1012 return -ENOMEM;
1013 }
1014
1015 rcu_read_lock();
1016 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
1017 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1018 rcu_read_unlock();
1019 nf_ct_put(ct);
1020 if (err <= 0)
1021 goto free;
1022
1023 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1024 if (err < 0)
1025 goto out;
1026
1027 return 0;
1028
1029 free:
1030 kfree_skb(skb2);
1031 out:
1032 /* this avoids a loop in nfnetlink. */
1033 return err == -EAGAIN ? -ENOBUFS : err;
1034 }
1035
1036 #ifdef CONFIG_NF_NAT_NEEDED
1037 static int
1038 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1039 enum nf_nat_manip_type manip,
1040 const struct nlattr *attr)
1041 {
1042 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1043
1044 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1045 if (!parse_nat_setup) {
1046 #ifdef CONFIG_MODULES
1047 rcu_read_unlock();
1048 spin_unlock_bh(&nf_conntrack_lock);
1049 nfnl_unlock();
1050 if (request_module("nf-nat-ipv4") < 0) {
1051 nfnl_lock();
1052 spin_lock_bh(&nf_conntrack_lock);
1053 rcu_read_lock();
1054 return -EOPNOTSUPP;
1055 }
1056 nfnl_lock();
1057 spin_lock_bh(&nf_conntrack_lock);
1058 rcu_read_lock();
1059 if (nfnetlink_parse_nat_setup_hook)
1060 return -EAGAIN;
1061 #endif
1062 return -EOPNOTSUPP;
1063 }
1064
1065 return parse_nat_setup(ct, manip, attr);
1066 }
1067 #endif
1068
1069 static int
1070 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1071 {
1072 unsigned long d;
1073 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1074 d = ct->status ^ status;
1075
1076 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1077 /* unchangeable */
1078 return -EBUSY;
1079
1080 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1081 /* SEEN_REPLY bit can only be set */
1082 return -EBUSY;
1083
1084 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1085 /* ASSURED bit can only be set */
1086 return -EBUSY;
1087
1088 /* Be careful here, modifying NAT bits can screw up things,
1089 * so don't let users modify them directly if they don't pass
1090 * nf_nat_range. */
1091 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1092 return 0;
1093 }
1094
1095 static int
1096 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1097 {
1098 #ifdef CONFIG_NF_NAT_NEEDED
1099 int ret;
1100
1101 if (cda[CTA_NAT_DST]) {
1102 ret = ctnetlink_parse_nat_setup(ct,
1103 NF_NAT_MANIP_DST,
1104 cda[CTA_NAT_DST]);
1105 if (ret < 0)
1106 return ret;
1107 }
1108 if (cda[CTA_NAT_SRC]) {
1109 ret = ctnetlink_parse_nat_setup(ct,
1110 NF_NAT_MANIP_SRC,
1111 cda[CTA_NAT_SRC]);
1112 if (ret < 0)
1113 return ret;
1114 }
1115 return 0;
1116 #else
1117 return -EOPNOTSUPP;
1118 #endif
1119 }
1120
1121 static inline int
1122 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1123 {
1124 struct nf_conntrack_helper *helper;
1125 struct nf_conn_help *help = nfct_help(ct);
1126 char *helpname = NULL;
1127 int err;
1128
1129 /* don't change helper of sibling connections */
1130 if (ct->master)
1131 return -EBUSY;
1132
1133 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1134 if (err < 0)
1135 return err;
1136
1137 if (!strcmp(helpname, "")) {
1138 if (help && help->helper) {
1139 /* we had a helper before ... */
1140 nf_ct_remove_expectations(ct);
1141 RCU_INIT_POINTER(help->helper, NULL);
1142 }
1143
1144 return 0;
1145 }
1146
1147 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1148 nf_ct_protonum(ct));
1149 if (helper == NULL) {
1150 #ifdef CONFIG_MODULES
1151 spin_unlock_bh(&nf_conntrack_lock);
1152
1153 if (request_module("nfct-helper-%s", helpname) < 0) {
1154 spin_lock_bh(&nf_conntrack_lock);
1155 return -EOPNOTSUPP;
1156 }
1157
1158 spin_lock_bh(&nf_conntrack_lock);
1159 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1160 nf_ct_protonum(ct));
1161 if (helper)
1162 return -EAGAIN;
1163 #endif
1164 return -EOPNOTSUPP;
1165 }
1166
1167 if (help) {
1168 if (help->helper == helper)
1169 return 0;
1170 if (help->helper)
1171 return -EBUSY;
1172 /* need to zero data of old helper */
1173 memset(&help->help, 0, sizeof(help->help));
1174 } else {
1175 /* we cannot set a helper for an existing conntrack */
1176 return -EOPNOTSUPP;
1177 }
1178
1179 rcu_assign_pointer(help->helper, helper);
1180
1181 return 0;
1182 }
1183
1184 static inline int
1185 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1186 {
1187 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1188
1189 if (!del_timer(&ct->timeout))
1190 return -ETIME;
1191
1192 ct->timeout.expires = jiffies + timeout * HZ;
1193 add_timer(&ct->timeout);
1194
1195 return 0;
1196 }
1197
1198 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1199 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1200 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1201 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1202 };
1203
1204 static inline int
1205 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1206 {
1207 const struct nlattr *attr = cda[CTA_PROTOINFO];
1208 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1209 struct nf_conntrack_l4proto *l4proto;
1210 int err = 0;
1211
1212 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1213
1214 rcu_read_lock();
1215 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1216 if (l4proto->from_nlattr)
1217 err = l4proto->from_nlattr(tb, ct);
1218 rcu_read_unlock();
1219
1220 return err;
1221 }
1222
1223 #ifdef CONFIG_NF_NAT_NEEDED
1224 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1225 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1226 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1227 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1228 };
1229
1230 static inline int
1231 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1232 {
1233 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1234
1235 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1236
1237 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1238 return -EINVAL;
1239
1240 natseq->correction_pos =
1241 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1242
1243 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1244 return -EINVAL;
1245
1246 natseq->offset_before =
1247 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1248
1249 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1250 return -EINVAL;
1251
1252 natseq->offset_after =
1253 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1254
1255 return 0;
1256 }
1257
1258 static int
1259 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1260 const struct nlattr * const cda[])
1261 {
1262 int ret = 0;
1263 struct nf_conn_nat *nat = nfct_nat(ct);
1264
1265 if (!nat)
1266 return 0;
1267
1268 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1269 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1270 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1271 if (ret < 0)
1272 return ret;
1273
1274 ct->status |= IPS_SEQ_ADJUST;
1275 }
1276
1277 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1278 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1279 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1280 if (ret < 0)
1281 return ret;
1282
1283 ct->status |= IPS_SEQ_ADJUST;
1284 }
1285
1286 return 0;
1287 }
1288 #endif
1289
1290 static int
1291 ctnetlink_change_conntrack(struct nf_conn *ct,
1292 const struct nlattr * const cda[])
1293 {
1294 int err;
1295
1296 /* only allow NAT changes and master assignation for new conntracks */
1297 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1298 return -EOPNOTSUPP;
1299
1300 if (cda[CTA_HELP]) {
1301 err = ctnetlink_change_helper(ct, cda);
1302 if (err < 0)
1303 return err;
1304 }
1305
1306 if (cda[CTA_TIMEOUT]) {
1307 err = ctnetlink_change_timeout(ct, cda);
1308 if (err < 0)
1309 return err;
1310 }
1311
1312 if (cda[CTA_STATUS]) {
1313 err = ctnetlink_change_status(ct, cda);
1314 if (err < 0)
1315 return err;
1316 }
1317
1318 if (cda[CTA_PROTOINFO]) {
1319 err = ctnetlink_change_protoinfo(ct, cda);
1320 if (err < 0)
1321 return err;
1322 }
1323
1324 #if defined(CONFIG_NF_CONNTRACK_MARK)
1325 if (cda[CTA_MARK])
1326 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1327 #endif
1328
1329 #ifdef CONFIG_NF_NAT_NEEDED
1330 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1331 err = ctnetlink_change_nat_seq_adj(ct, cda);
1332 if (err < 0)
1333 return err;
1334 }
1335 #endif
1336
1337 return 0;
1338 }
1339
1340 static struct nf_conn *
1341 ctnetlink_create_conntrack(struct net *net, u16 zone,
1342 const struct nlattr * const cda[],
1343 struct nf_conntrack_tuple *otuple,
1344 struct nf_conntrack_tuple *rtuple,
1345 u8 u3)
1346 {
1347 struct nf_conn *ct;
1348 int err = -EINVAL;
1349 struct nf_conntrack_helper *helper;
1350 struct nf_conn_tstamp *tstamp;
1351
1352 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1353 if (IS_ERR(ct))
1354 return ERR_PTR(-ENOMEM);
1355
1356 if (!cda[CTA_TIMEOUT])
1357 goto err1;
1358 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1359
1360 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1361
1362 rcu_read_lock();
1363 if (cda[CTA_HELP]) {
1364 char *helpname = NULL;
1365
1366 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1367 if (err < 0)
1368 goto err2;
1369
1370 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1371 nf_ct_protonum(ct));
1372 if (helper == NULL) {
1373 rcu_read_unlock();
1374 spin_unlock_bh(&nf_conntrack_lock);
1375 #ifdef CONFIG_MODULES
1376 if (request_module("nfct-helper-%s", helpname) < 0) {
1377 spin_lock_bh(&nf_conntrack_lock);
1378 err = -EOPNOTSUPP;
1379 goto err1;
1380 }
1381
1382 spin_lock_bh(&nf_conntrack_lock);
1383 rcu_read_lock();
1384 helper = __nf_conntrack_helper_find(helpname,
1385 nf_ct_l3num(ct),
1386 nf_ct_protonum(ct));
1387 if (helper) {
1388 err = -EAGAIN;
1389 goto err2;
1390 }
1391 rcu_read_unlock();
1392 #endif
1393 err = -EOPNOTSUPP;
1394 goto err1;
1395 } else {
1396 struct nf_conn_help *help;
1397
1398 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1399 if (help == NULL) {
1400 err = -ENOMEM;
1401 goto err2;
1402 }
1403
1404 /* not in hash table yet so not strictly necessary */
1405 RCU_INIT_POINTER(help->helper, helper);
1406 }
1407 } else {
1408 /* try an implicit helper assignation */
1409 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1410 if (err < 0)
1411 goto err2;
1412 }
1413
1414 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1415 err = ctnetlink_change_nat(ct, cda);
1416 if (err < 0)
1417 goto err2;
1418 }
1419
1420 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1421 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1422 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1423 /* we must add conntrack extensions before confirmation. */
1424 ct->status |= IPS_CONFIRMED;
1425
1426 if (cda[CTA_STATUS]) {
1427 err = ctnetlink_change_status(ct, cda);
1428 if (err < 0)
1429 goto err2;
1430 }
1431
1432 #ifdef CONFIG_NF_NAT_NEEDED
1433 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1434 err = ctnetlink_change_nat_seq_adj(ct, cda);
1435 if (err < 0)
1436 goto err2;
1437 }
1438 #endif
1439
1440 memset(&ct->proto, 0, sizeof(ct->proto));
1441 if (cda[CTA_PROTOINFO]) {
1442 err = ctnetlink_change_protoinfo(ct, cda);
1443 if (err < 0)
1444 goto err2;
1445 }
1446
1447 #if defined(CONFIG_NF_CONNTRACK_MARK)
1448 if (cda[CTA_MARK])
1449 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1450 #endif
1451
1452 /* setup master conntrack: this is a confirmed expectation */
1453 if (cda[CTA_TUPLE_MASTER]) {
1454 struct nf_conntrack_tuple master;
1455 struct nf_conntrack_tuple_hash *master_h;
1456 struct nf_conn *master_ct;
1457
1458 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1459 if (err < 0)
1460 goto err2;
1461
1462 master_h = nf_conntrack_find_get(net, zone, &master);
1463 if (master_h == NULL) {
1464 err = -ENOENT;
1465 goto err2;
1466 }
1467 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1468 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1469 ct->master = master_ct;
1470 }
1471 tstamp = nf_conn_tstamp_find(ct);
1472 if (tstamp)
1473 tstamp->start = ktime_to_ns(ktime_get_real());
1474
1475 add_timer(&ct->timeout);
1476 nf_conntrack_hash_insert(ct);
1477 rcu_read_unlock();
1478
1479 return ct;
1480
1481 err2:
1482 rcu_read_unlock();
1483 err1:
1484 nf_conntrack_free(ct);
1485 return ERR_PTR(err);
1486 }
1487
1488 static int
1489 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1490 const struct nlmsghdr *nlh,
1491 const struct nlattr * const cda[])
1492 {
1493 struct net *net = sock_net(ctnl);
1494 struct nf_conntrack_tuple otuple, rtuple;
1495 struct nf_conntrack_tuple_hash *h = NULL;
1496 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1497 u_int8_t u3 = nfmsg->nfgen_family;
1498 u16 zone;
1499 int err;
1500
1501 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1502 if (err < 0)
1503 return err;
1504
1505 if (cda[CTA_TUPLE_ORIG]) {
1506 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1507 if (err < 0)
1508 return err;
1509 }
1510
1511 if (cda[CTA_TUPLE_REPLY]) {
1512 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1513 if (err < 0)
1514 return err;
1515 }
1516
1517 spin_lock_bh(&nf_conntrack_lock);
1518 if (cda[CTA_TUPLE_ORIG])
1519 h = __nf_conntrack_find(net, zone, &otuple);
1520 else if (cda[CTA_TUPLE_REPLY])
1521 h = __nf_conntrack_find(net, zone, &rtuple);
1522
1523 if (h == NULL) {
1524 err = -ENOENT;
1525 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1526 struct nf_conn *ct;
1527 enum ip_conntrack_events events;
1528
1529 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1530 &rtuple, u3);
1531 if (IS_ERR(ct)) {
1532 err = PTR_ERR(ct);
1533 goto out_unlock;
1534 }
1535 err = 0;
1536 nf_conntrack_get(&ct->ct_general);
1537 spin_unlock_bh(&nf_conntrack_lock);
1538 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1539 events = IPCT_RELATED;
1540 else
1541 events = IPCT_NEW;
1542
1543 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1544 (1 << IPCT_ASSURED) |
1545 (1 << IPCT_HELPER) |
1546 (1 << IPCT_PROTOINFO) |
1547 (1 << IPCT_NATSEQADJ) |
1548 (1 << IPCT_MARK) | events,
1549 ct, NETLINK_CB(skb).pid,
1550 nlmsg_report(nlh));
1551 nf_ct_put(ct);
1552 } else
1553 spin_unlock_bh(&nf_conntrack_lock);
1554
1555 return err;
1556 }
1557 /* implicit 'else' */
1558
1559 /* We manipulate the conntrack inside the global conntrack table lock,
1560 * so there's no need to increase the refcount */
1561 err = -EEXIST;
1562 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1563 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1564
1565 err = ctnetlink_change_conntrack(ct, cda);
1566 if (err == 0) {
1567 nf_conntrack_get(&ct->ct_general);
1568 spin_unlock_bh(&nf_conntrack_lock);
1569 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1570 (1 << IPCT_ASSURED) |
1571 (1 << IPCT_HELPER) |
1572 (1 << IPCT_PROTOINFO) |
1573 (1 << IPCT_NATSEQADJ) |
1574 (1 << IPCT_MARK),
1575 ct, NETLINK_CB(skb).pid,
1576 nlmsg_report(nlh));
1577 nf_ct_put(ct);
1578 } else
1579 spin_unlock_bh(&nf_conntrack_lock);
1580
1581 return err;
1582 }
1583
1584 out_unlock:
1585 spin_unlock_bh(&nf_conntrack_lock);
1586 return err;
1587 }
1588
1589 /***********************************************************************
1590 * EXPECT
1591 ***********************************************************************/
1592
1593 static inline int
1594 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1595 const struct nf_conntrack_tuple *tuple,
1596 enum ctattr_expect type)
1597 {
1598 struct nlattr *nest_parms;
1599
1600 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1601 if (!nest_parms)
1602 goto nla_put_failure;
1603 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1604 goto nla_put_failure;
1605 nla_nest_end(skb, nest_parms);
1606
1607 return 0;
1608
1609 nla_put_failure:
1610 return -1;
1611 }
1612
1613 static inline int
1614 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1615 const struct nf_conntrack_tuple *tuple,
1616 const struct nf_conntrack_tuple_mask *mask)
1617 {
1618 int ret;
1619 struct nf_conntrack_l3proto *l3proto;
1620 struct nf_conntrack_l4proto *l4proto;
1621 struct nf_conntrack_tuple m;
1622 struct nlattr *nest_parms;
1623
1624 memset(&m, 0xFF, sizeof(m));
1625 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1626 m.src.u.all = mask->src.u.all;
1627 m.dst.protonum = tuple->dst.protonum;
1628
1629 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1630 if (!nest_parms)
1631 goto nla_put_failure;
1632
1633 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1634 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1635
1636 if (unlikely(ret < 0))
1637 goto nla_put_failure;
1638
1639 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1640 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1641 if (unlikely(ret < 0))
1642 goto nla_put_failure;
1643
1644 nla_nest_end(skb, nest_parms);
1645
1646 return 0;
1647
1648 nla_put_failure:
1649 return -1;
1650 }
1651
1652 static int
1653 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1654 const struct nf_conntrack_expect *exp)
1655 {
1656 struct nf_conn *master = exp->master;
1657 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
1658 struct nf_conn_help *help;
1659
1660 if (timeout < 0)
1661 timeout = 0;
1662
1663 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1664 goto nla_put_failure;
1665 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1666 goto nla_put_failure;
1667 if (ctnetlink_exp_dump_tuple(skb,
1668 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1669 CTA_EXPECT_MASTER) < 0)
1670 goto nla_put_failure;
1671
1672 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1673 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1674 NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1675 help = nfct_help(master);
1676 if (help) {
1677 struct nf_conntrack_helper *helper;
1678
1679 helper = rcu_dereference(help->helper);
1680 if (helper)
1681 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1682 }
1683
1684 return 0;
1685
1686 nla_put_failure:
1687 return -1;
1688 }
1689
1690 static int
1691 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1692 int event, const struct nf_conntrack_expect *exp)
1693 {
1694 struct nlmsghdr *nlh;
1695 struct nfgenmsg *nfmsg;
1696 unsigned int flags = pid ? NLM_F_MULTI : 0;
1697
1698 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1699 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1700 if (nlh == NULL)
1701 goto nlmsg_failure;
1702
1703 nfmsg = nlmsg_data(nlh);
1704 nfmsg->nfgen_family = exp->tuple.src.l3num;
1705 nfmsg->version = NFNETLINK_V0;
1706 nfmsg->res_id = 0;
1707
1708 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1709 goto nla_put_failure;
1710
1711 nlmsg_end(skb, nlh);
1712 return skb->len;
1713
1714 nlmsg_failure:
1715 nla_put_failure:
1716 nlmsg_cancel(skb, nlh);
1717 return -1;
1718 }
1719
1720 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1721 static int
1722 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1723 {
1724 struct nf_conntrack_expect *exp = item->exp;
1725 struct net *net = nf_ct_exp_net(exp);
1726 struct nlmsghdr *nlh;
1727 struct nfgenmsg *nfmsg;
1728 struct sk_buff *skb;
1729 unsigned int type, group;
1730 int flags = 0;
1731
1732 if (events & (1 << IPEXP_DESTROY)) {
1733 type = IPCTNL_MSG_EXP_DELETE;
1734 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1735 } else if (events & (1 << IPEXP_NEW)) {
1736 type = IPCTNL_MSG_EXP_NEW;
1737 flags = NLM_F_CREATE|NLM_F_EXCL;
1738 group = NFNLGRP_CONNTRACK_EXP_NEW;
1739 } else
1740 return 0;
1741
1742 if (!item->report && !nfnetlink_has_listeners(net, group))
1743 return 0;
1744
1745 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1746 if (skb == NULL)
1747 goto errout;
1748
1749 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1750 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1751 if (nlh == NULL)
1752 goto nlmsg_failure;
1753
1754 nfmsg = nlmsg_data(nlh);
1755 nfmsg->nfgen_family = exp->tuple.src.l3num;
1756 nfmsg->version = NFNETLINK_V0;
1757 nfmsg->res_id = 0;
1758
1759 rcu_read_lock();
1760 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1761 goto nla_put_failure;
1762 rcu_read_unlock();
1763
1764 nlmsg_end(skb, nlh);
1765 nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1766 return 0;
1767
1768 nla_put_failure:
1769 rcu_read_unlock();
1770 nlmsg_cancel(skb, nlh);
1771 nlmsg_failure:
1772 kfree_skb(skb);
1773 errout:
1774 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1775 return 0;
1776 }
1777 #endif
1778 static int ctnetlink_exp_done(struct netlink_callback *cb)
1779 {
1780 if (cb->args[1])
1781 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1782 return 0;
1783 }
1784
1785 static int
1786 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1787 {
1788 struct net *net = sock_net(skb->sk);
1789 struct nf_conntrack_expect *exp, *last;
1790 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1791 struct hlist_node *n;
1792 u_int8_t l3proto = nfmsg->nfgen_family;
1793
1794 rcu_read_lock();
1795 last = (struct nf_conntrack_expect *)cb->args[1];
1796 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1797 restart:
1798 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1799 hnode) {
1800 if (l3proto && exp->tuple.src.l3num != l3proto)
1801 continue;
1802 if (cb->args[1]) {
1803 if (exp != last)
1804 continue;
1805 cb->args[1] = 0;
1806 }
1807 if (ctnetlink_exp_fill_info(skb,
1808 NETLINK_CB(cb->skb).pid,
1809 cb->nlh->nlmsg_seq,
1810 IPCTNL_MSG_EXP_NEW,
1811 exp) < 0) {
1812 if (!atomic_inc_not_zero(&exp->use))
1813 continue;
1814 cb->args[1] = (unsigned long)exp;
1815 goto out;
1816 }
1817 }
1818 if (cb->args[1]) {
1819 cb->args[1] = 0;
1820 goto restart;
1821 }
1822 }
1823 out:
1824 rcu_read_unlock();
1825 if (last)
1826 nf_ct_expect_put(last);
1827
1828 return skb->len;
1829 }
1830
1831 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1832 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1833 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1834 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1835 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1836 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1837 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1838 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
1839 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
1840 };
1841
1842 static int
1843 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1844 const struct nlmsghdr *nlh,
1845 const struct nlattr * const cda[])
1846 {
1847 struct net *net = sock_net(ctnl);
1848 struct nf_conntrack_tuple tuple;
1849 struct nf_conntrack_expect *exp;
1850 struct sk_buff *skb2;
1851 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1852 u_int8_t u3 = nfmsg->nfgen_family;
1853 u16 zone;
1854 int err;
1855
1856 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1857 struct netlink_dump_control c = {
1858 .dump = ctnetlink_exp_dump_table,
1859 .done = ctnetlink_exp_done,
1860 };
1861 return netlink_dump_start(ctnl, skb, nlh, &c);
1862 }
1863
1864 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1865 if (err < 0)
1866 return err;
1867
1868 if (cda[CTA_EXPECT_TUPLE])
1869 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1870 else if (cda[CTA_EXPECT_MASTER])
1871 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1872 else
1873 return -EINVAL;
1874
1875 if (err < 0)
1876 return err;
1877
1878 exp = nf_ct_expect_find_get(net, zone, &tuple);
1879 if (!exp)
1880 return -ENOENT;
1881
1882 if (cda[CTA_EXPECT_ID]) {
1883 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1884 if (ntohl(id) != (u32)(unsigned long)exp) {
1885 nf_ct_expect_put(exp);
1886 return -ENOENT;
1887 }
1888 }
1889
1890 err = -ENOMEM;
1891 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1892 if (skb2 == NULL) {
1893 nf_ct_expect_put(exp);
1894 goto out;
1895 }
1896
1897 rcu_read_lock();
1898 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1899 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1900 rcu_read_unlock();
1901 nf_ct_expect_put(exp);
1902 if (err <= 0)
1903 goto free;
1904
1905 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1906 if (err < 0)
1907 goto out;
1908
1909 return 0;
1910
1911 free:
1912 kfree_skb(skb2);
1913 out:
1914 /* this avoids a loop in nfnetlink. */
1915 return err == -EAGAIN ? -ENOBUFS : err;
1916 }
1917
1918 static int
1919 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1920 const struct nlmsghdr *nlh,
1921 const struct nlattr * const cda[])
1922 {
1923 struct net *net = sock_net(ctnl);
1924 struct nf_conntrack_expect *exp;
1925 struct nf_conntrack_tuple tuple;
1926 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1927 struct hlist_node *n, *next;
1928 u_int8_t u3 = nfmsg->nfgen_family;
1929 unsigned int i;
1930 u16 zone;
1931 int err;
1932
1933 if (cda[CTA_EXPECT_TUPLE]) {
1934 /* delete a single expect by tuple */
1935 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1936 if (err < 0)
1937 return err;
1938
1939 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1940 if (err < 0)
1941 return err;
1942
1943 /* bump usage count to 2 */
1944 exp = nf_ct_expect_find_get(net, zone, &tuple);
1945 if (!exp)
1946 return -ENOENT;
1947
1948 if (cda[CTA_EXPECT_ID]) {
1949 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1950 if (ntohl(id) != (u32)(unsigned long)exp) {
1951 nf_ct_expect_put(exp);
1952 return -ENOENT;
1953 }
1954 }
1955
1956 /* after list removal, usage count == 1 */
1957 spin_lock_bh(&nf_conntrack_lock);
1958 if (del_timer(&exp->timeout)) {
1959 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1960 nlmsg_report(nlh));
1961 nf_ct_expect_put(exp);
1962 }
1963 spin_unlock_bh(&nf_conntrack_lock);
1964 /* have to put what we 'get' above.
1965 * after this line usage count == 0 */
1966 nf_ct_expect_put(exp);
1967 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1968 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1969 struct nf_conn_help *m_help;
1970
1971 /* delete all expectations for this helper */
1972 spin_lock_bh(&nf_conntrack_lock);
1973 for (i = 0; i < nf_ct_expect_hsize; i++) {
1974 hlist_for_each_entry_safe(exp, n, next,
1975 &net->ct.expect_hash[i],
1976 hnode) {
1977 m_help = nfct_help(exp->master);
1978 if (!strcmp(m_help->helper->name, name) &&
1979 del_timer(&exp->timeout)) {
1980 nf_ct_unlink_expect_report(exp,
1981 NETLINK_CB(skb).pid,
1982 nlmsg_report(nlh));
1983 nf_ct_expect_put(exp);
1984 }
1985 }
1986 }
1987 spin_unlock_bh(&nf_conntrack_lock);
1988 } else {
1989 /* This basically means we have to flush everything*/
1990 spin_lock_bh(&nf_conntrack_lock);
1991 for (i = 0; i < nf_ct_expect_hsize; i++) {
1992 hlist_for_each_entry_safe(exp, n, next,
1993 &net->ct.expect_hash[i],
1994 hnode) {
1995 if (del_timer(&exp->timeout)) {
1996 nf_ct_unlink_expect_report(exp,
1997 NETLINK_CB(skb).pid,
1998 nlmsg_report(nlh));
1999 nf_ct_expect_put(exp);
2000 }
2001 }
2002 }
2003 spin_unlock_bh(&nf_conntrack_lock);
2004 }
2005
2006 return 0;
2007 }
2008 static int
2009 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2010 const struct nlattr * const cda[])
2011 {
2012 return -EOPNOTSUPP;
2013 }
2014
2015 static int
2016 ctnetlink_create_expect(struct net *net, u16 zone,
2017 const struct nlattr * const cda[],
2018 u_int8_t u3,
2019 u32 pid, int report)
2020 {
2021 struct nf_conntrack_tuple tuple, mask, master_tuple;
2022 struct nf_conntrack_tuple_hash *h = NULL;
2023 struct nf_conntrack_expect *exp;
2024 struct nf_conn *ct;
2025 struct nf_conn_help *help;
2026 int err = 0;
2027
2028 /* caller guarantees that those three CTA_EXPECT_* exist */
2029 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2030 if (err < 0)
2031 return err;
2032 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2033 if (err < 0)
2034 return err;
2035 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2036 if (err < 0)
2037 return err;
2038
2039 /* Look for master conntrack of this expectation */
2040 h = nf_conntrack_find_get(net, zone, &master_tuple);
2041 if (!h)
2042 return -ENOENT;
2043 ct = nf_ct_tuplehash_to_ctrack(h);
2044 exp = nf_ct_expect_alloc(ct);
2045 if (!exp) {
2046 err = -ENOMEM;
2047 goto out;
2048 }
2049 help = nfct_help(ct);
2050 if (!help) {
2051 if (!cda[CTA_EXPECT_TIMEOUT]) {
2052 err = -EINVAL;
2053 goto out;
2054 }
2055 exp->timeout.expires =
2056 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2057
2058 exp->flags = NF_CT_EXPECT_USERSPACE;
2059 if (cda[CTA_EXPECT_FLAGS]) {
2060 exp->flags |=
2061 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2062 }
2063 } else {
2064 if (cda[CTA_EXPECT_FLAGS]) {
2065 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2066 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2067 } else
2068 exp->flags = 0;
2069 }
2070
2071 exp->class = 0;
2072 exp->expectfn = NULL;
2073 exp->master = ct;
2074 exp->helper = NULL;
2075 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2076 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2077 exp->mask.src.u.all = mask.src.u.all;
2078
2079 err = nf_ct_expect_related_report(exp, pid, report);
2080 nf_ct_expect_put(exp);
2081
2082 out:
2083 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2084 return err;
2085 }
2086
2087 static int
2088 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2089 const struct nlmsghdr *nlh,
2090 const struct nlattr * const cda[])
2091 {
2092 struct net *net = sock_net(ctnl);
2093 struct nf_conntrack_tuple tuple;
2094 struct nf_conntrack_expect *exp;
2095 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2096 u_int8_t u3 = nfmsg->nfgen_family;
2097 u16 zone;
2098 int err;
2099
2100 if (!cda[CTA_EXPECT_TUPLE]
2101 || !cda[CTA_EXPECT_MASK]
2102 || !cda[CTA_EXPECT_MASTER])
2103 return -EINVAL;
2104
2105 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2106 if (err < 0)
2107 return err;
2108
2109 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2110 if (err < 0)
2111 return err;
2112
2113 spin_lock_bh(&nf_conntrack_lock);
2114 exp = __nf_ct_expect_find(net, zone, &tuple);
2115
2116 if (!exp) {
2117 spin_unlock_bh(&nf_conntrack_lock);
2118 err = -ENOENT;
2119 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2120 err = ctnetlink_create_expect(net, zone, cda,
2121 u3,
2122 NETLINK_CB(skb).pid,
2123 nlmsg_report(nlh));
2124 }
2125 return err;
2126 }
2127
2128 err = -EEXIST;
2129 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2130 err = ctnetlink_change_expect(exp, cda);
2131 spin_unlock_bh(&nf_conntrack_lock);
2132
2133 return err;
2134 }
2135
2136 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2137 static struct nf_ct_event_notifier ctnl_notifier = {
2138 .fcn = ctnetlink_conntrack_event,
2139 };
2140
2141 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2142 .fcn = ctnetlink_expect_event,
2143 };
2144 #endif
2145
2146 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2147 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2148 .attr_count = CTA_MAX,
2149 .policy = ct_nla_policy },
2150 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2151 .attr_count = CTA_MAX,
2152 .policy = ct_nla_policy },
2153 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2154 .attr_count = CTA_MAX,
2155 .policy = ct_nla_policy },
2156 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2157 .attr_count = CTA_MAX,
2158 .policy = ct_nla_policy },
2159 };
2160
2161 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2162 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2163 .attr_count = CTA_EXPECT_MAX,
2164 .policy = exp_nla_policy },
2165 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2166 .attr_count = CTA_EXPECT_MAX,
2167 .policy = exp_nla_policy },
2168 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2169 .attr_count = CTA_EXPECT_MAX,
2170 .policy = exp_nla_policy },
2171 };
2172
2173 static const struct nfnetlink_subsystem ctnl_subsys = {
2174 .name = "conntrack",
2175 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2176 .cb_count = IPCTNL_MSG_MAX,
2177 .cb = ctnl_cb,
2178 };
2179
2180 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2181 .name = "conntrack_expect",
2182 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2183 .cb_count = IPCTNL_MSG_EXP_MAX,
2184 .cb = ctnl_exp_cb,
2185 };
2186
2187 MODULE_ALIAS("ip_conntrack_netlink");
2188 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2189 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2190
2191 static int __net_init ctnetlink_net_init(struct net *net)
2192 {
2193 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2194 int ret;
2195
2196 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
2197 if (ret < 0) {
2198 pr_err("ctnetlink_init: cannot register notifier.\n");
2199 goto err_out;
2200 }
2201
2202 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
2203 if (ret < 0) {
2204 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2205 goto err_unreg_notifier;
2206 }
2207 #endif
2208 return 0;
2209
2210 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2211 err_unreg_notifier:
2212 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2213 err_out:
2214 return ret;
2215 #endif
2216 }
2217
2218 static void ctnetlink_net_exit(struct net *net)
2219 {
2220 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2221 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
2222 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2223 #endif
2224 }
2225
2226 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
2227 {
2228 struct net *net;
2229
2230 list_for_each_entry(net, net_exit_list, exit_list)
2231 ctnetlink_net_exit(net);
2232 }
2233
2234 static struct pernet_operations ctnetlink_net_ops = {
2235 .init = ctnetlink_net_init,
2236 .exit_batch = ctnetlink_net_exit_batch,
2237 };
2238
2239 static int __init ctnetlink_init(void)
2240 {
2241 int ret;
2242
2243 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2244 ret = nfnetlink_subsys_register(&ctnl_subsys);
2245 if (ret < 0) {
2246 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2247 goto err_out;
2248 }
2249
2250 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2251 if (ret < 0) {
2252 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2253 goto err_unreg_subsys;
2254 }
2255
2256 if (register_pernet_subsys(&ctnetlink_net_ops)) {
2257 pr_err("ctnetlink_init: cannot register pernet operations\n");
2258 goto err_unreg_exp_subsys;
2259 }
2260
2261 return 0;
2262
2263 err_unreg_exp_subsys:
2264 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2265 err_unreg_subsys:
2266 nfnetlink_subsys_unregister(&ctnl_subsys);
2267 err_out:
2268 return ret;
2269 }
2270
2271 static void __exit ctnetlink_exit(void)
2272 {
2273 pr_info("ctnetlink: unregistering from nfnetlink.\n");
2274
2275 unregister_pernet_subsys(&ctnetlink_net_ops);
2276 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2277 nfnetlink_subsys_unregister(&ctnl_subsys);
2278 }
2279
2280 module_init(ctnetlink_init);
2281 module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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