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netfilter: ctnetlink: use expect instead of master tuple in get operation
[linux-2.6/libata-dev.git] / net / netfilter / nf_conntrack_netlink.c
blob77d209c235a0c9a9497ee8158741250659e632eb
1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2011 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/security.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
32
33 #include <linux/netfilter.h>
34 #include <net/netlink.h>
35 #include <net/sock.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_core.h>
38 #include <net/netfilter/nf_conntrack_expect.h>
39 #include <net/netfilter/nf_conntrack_helper.h>
40 #include <net/netfilter/nf_conntrack_l3proto.h>
41 #include <net/netfilter/nf_conntrack_l4proto.h>
42 #include <net/netfilter/nf_conntrack_tuple.h>
43 #include <net/netfilter/nf_conntrack_acct.h>
44 #include <net/netfilter/nf_conntrack_zones.h>
45 #include <net/netfilter/nf_conntrack_timestamp.h>
46 #ifdef CONFIG_NF_NAT_NEEDED
47 #include <net/netfilter/nf_nat_core.h>
48 #include <net/netfilter/nf_nat_protocol.h>
49 #endif
50
51 #include <linux/netfilter/nfnetlink.h>
52 #include <linux/netfilter/nfnetlink_conntrack.h>
53
54 MODULE_LICENSE("GPL");
55
56 static char __initdata version[] = "0.93";
57
58 static inline int
59 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
60 const struct nf_conntrack_tuple *tuple,
61 struct nf_conntrack_l4proto *l4proto)
62 {
63 int ret = 0;
64 struct nlattr *nest_parms;
65
66 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
67 if (!nest_parms)
68 goto nla_put_failure;
69 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
70
71 if (likely(l4proto->tuple_to_nlattr))
72 ret = l4proto->tuple_to_nlattr(skb, tuple);
73
74 nla_nest_end(skb, nest_parms);
75
76 return ret;
77
78 nla_put_failure:
79 return -1;
80 }
81
82 static inline int
83 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
84 const struct nf_conntrack_tuple *tuple,
85 struct nf_conntrack_l3proto *l3proto)
86 {
87 int ret = 0;
88 struct nlattr *nest_parms;
89
90 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
91 if (!nest_parms)
92 goto nla_put_failure;
93
94 if (likely(l3proto->tuple_to_nlattr))
95 ret = l3proto->tuple_to_nlattr(skb, tuple);
96
97 nla_nest_end(skb, nest_parms);
98
99 return ret;
100
101 nla_put_failure:
102 return -1;
103 }
104
105 static int
106 ctnetlink_dump_tuples(struct sk_buff *skb,
107 const struct nf_conntrack_tuple *tuple)
108 {
109 int ret;
110 struct nf_conntrack_l3proto *l3proto;
111 struct nf_conntrack_l4proto *l4proto;
112
113 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
114 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
115
116 if (unlikely(ret < 0))
117 return ret;
118
119 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
120 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
121
122 return ret;
123 }
124
125 static inline int
126 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
127 {
128 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
129 return 0;
130
131 nla_put_failure:
132 return -1;
133 }
134
135 static inline int
136 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
137 {
138 long timeout = (ct->timeout.expires - jiffies) / HZ;
139
140 if (timeout < 0)
141 timeout = 0;
142
143 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
144 return 0;
145
146 nla_put_failure:
147 return -1;
148 }
149
150 static inline int
151 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
152 {
153 struct nf_conntrack_l4proto *l4proto;
154 struct nlattr *nest_proto;
155 int ret;
156
157 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
158 if (!l4proto->to_nlattr)
159 return 0;
160
161 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
162 if (!nest_proto)
163 goto nla_put_failure;
164
165 ret = l4proto->to_nlattr(skb, nest_proto, ct);
166
167 nla_nest_end(skb, nest_proto);
168
169 return ret;
170
171 nla_put_failure:
172 return -1;
173 }
174
175 static inline int
176 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
177 {
178 struct nlattr *nest_helper;
179 const struct nf_conn_help *help = nfct_help(ct);
180 struct nf_conntrack_helper *helper;
181
182 if (!help)
183 return 0;
184
185 helper = rcu_dereference(help->helper);
186 if (!helper)
187 goto out;
188
189 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
190 if (!nest_helper)
191 goto nla_put_failure;
192 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
193
194 if (helper->to_nlattr)
195 helper->to_nlattr(skb, ct);
196
197 nla_nest_end(skb, nest_helper);
198 out:
199 return 0;
200
201 nla_put_failure:
202 return -1;
203 }
204
205 static int
206 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
207 enum ip_conntrack_dir dir)
208 {
209 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
210 struct nlattr *nest_count;
211 const struct nf_conn_counter *acct;
212
213 acct = nf_conn_acct_find(ct);
214 if (!acct)
215 return 0;
216
217 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
218 if (!nest_count)
219 goto nla_put_failure;
220
221 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
222 cpu_to_be64(atomic64_read(&acct[dir].packets)));
223 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
224 cpu_to_be64(atomic64_read(&acct[dir].bytes)));
225
226 nla_nest_end(skb, nest_count);
227
228 return 0;
229
230 nla_put_failure:
231 return -1;
232 }
233
234 static int
235 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
236 {
237 struct nlattr *nest_count;
238 const struct nf_conn_tstamp *tstamp;
239
240 tstamp = nf_conn_tstamp_find(ct);
241 if (!tstamp)
242 return 0;
243
244 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
245 if (!nest_count)
246 goto nla_put_failure;
247
248 NLA_PUT_BE64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start));
249 if (tstamp->stop != 0) {
250 NLA_PUT_BE64(skb, CTA_TIMESTAMP_STOP,
251 cpu_to_be64(tstamp->stop));
252 }
253 nla_nest_end(skb, nest_count);
254
255 return 0;
256
257 nla_put_failure:
258 return -1;
259 }
260
261 #ifdef CONFIG_NF_CONNTRACK_MARK
262 static inline int
263 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
264 {
265 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
266 return 0;
267
268 nla_put_failure:
269 return -1;
270 }
271 #else
272 #define ctnetlink_dump_mark(a, b) (0)
273 #endif
274
275 #ifdef CONFIG_NF_CONNTRACK_SECMARK
276 static inline int
277 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
278 {
279 struct nlattr *nest_secctx;
280 int len, ret;
281 char *secctx;
282
283 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
284 if (ret)
285 return 0;
286
287 ret = -1;
288 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
289 if (!nest_secctx)
290 goto nla_put_failure;
291
292 NLA_PUT_STRING(skb, CTA_SECCTX_NAME, secctx);
293 nla_nest_end(skb, nest_secctx);
294
295 ret = 0;
296 nla_put_failure:
297 security_release_secctx(secctx, len);
298 return ret;
299 }
300 #else
301 #define ctnetlink_dump_secctx(a, b) (0)
302 #endif
303
304 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
305
306 static inline int
307 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
308 {
309 struct nlattr *nest_parms;
310
311 if (!(ct->status & IPS_EXPECTED))
312 return 0;
313
314 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
315 if (!nest_parms)
316 goto nla_put_failure;
317 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
318 goto nla_put_failure;
319 nla_nest_end(skb, nest_parms);
320
321 return 0;
322
323 nla_put_failure:
324 return -1;
325 }
326
327 #ifdef CONFIG_NF_NAT_NEEDED
328 static int
329 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
330 {
331 struct nlattr *nest_parms;
332
333 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
334 if (!nest_parms)
335 goto nla_put_failure;
336
337 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
338 htonl(natseq->correction_pos));
339 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
340 htonl(natseq->offset_before));
341 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
342 htonl(natseq->offset_after));
343
344 nla_nest_end(skb, nest_parms);
345
346 return 0;
347
348 nla_put_failure:
349 return -1;
350 }
351
352 static inline int
353 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
354 {
355 struct nf_nat_seq *natseq;
356 struct nf_conn_nat *nat = nfct_nat(ct);
357
358 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
359 return 0;
360
361 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
362 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
363 return -1;
364
365 natseq = &nat->seq[IP_CT_DIR_REPLY];
366 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
367 return -1;
368
369 return 0;
370 }
371 #else
372 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
373 #endif
374
375 static inline int
376 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
377 {
378 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
379 return 0;
380
381 nla_put_failure:
382 return -1;
383 }
384
385 static inline int
386 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
387 {
388 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
389 return 0;
390
391 nla_put_failure:
392 return -1;
393 }
394
395 static int
396 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
397 int event, struct nf_conn *ct)
398 {
399 struct nlmsghdr *nlh;
400 struct nfgenmsg *nfmsg;
401 struct nlattr *nest_parms;
402 unsigned int flags = pid ? NLM_F_MULTI : 0;
403
404 event |= NFNL_SUBSYS_CTNETLINK << 8;
405 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
406 if (nlh == NULL)
407 goto nlmsg_failure;
408
409 nfmsg = nlmsg_data(nlh);
410 nfmsg->nfgen_family = nf_ct_l3num(ct);
411 nfmsg->version = NFNETLINK_V0;
412 nfmsg->res_id = 0;
413
414 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
415 if (!nest_parms)
416 goto nla_put_failure;
417 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
418 goto nla_put_failure;
419 nla_nest_end(skb, nest_parms);
420
421 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
422 if (!nest_parms)
423 goto nla_put_failure;
424 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
425 goto nla_put_failure;
426 nla_nest_end(skb, nest_parms);
427
428 if (nf_ct_zone(ct))
429 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
430
431 if (ctnetlink_dump_status(skb, ct) < 0 ||
432 ctnetlink_dump_timeout(skb, ct) < 0 ||
433 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
434 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
435 ctnetlink_dump_timestamp(skb, ct) < 0 ||
436 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
437 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
438 ctnetlink_dump_mark(skb, ct) < 0 ||
439 ctnetlink_dump_secctx(skb, ct) < 0 ||
440 ctnetlink_dump_id(skb, ct) < 0 ||
441 ctnetlink_dump_use(skb, ct) < 0 ||
442 ctnetlink_dump_master(skb, ct) < 0 ||
443 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
444 goto nla_put_failure;
445
446 nlmsg_end(skb, nlh);
447 return skb->len;
448
449 nlmsg_failure:
450 nla_put_failure:
451 nlmsg_cancel(skb, nlh);
452 return -1;
453 }
454
455 #ifdef CONFIG_NF_CONNTRACK_EVENTS
456 static inline size_t
457 ctnetlink_proto_size(const struct nf_conn *ct)
458 {
459 struct nf_conntrack_l3proto *l3proto;
460 struct nf_conntrack_l4proto *l4proto;
461 size_t len = 0;
462
463 rcu_read_lock();
464 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
465 len += l3proto->nla_size;
466
467 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
468 len += l4proto->nla_size;
469 rcu_read_unlock();
470
471 return len;
472 }
473
474 static inline size_t
475 ctnetlink_counters_size(const struct nf_conn *ct)
476 {
477 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
478 return 0;
479 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
480 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
481 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
482 ;
483 }
484
485 static inline int
486 ctnetlink_secctx_size(const struct nf_conn *ct)
487 {
488 #ifdef CONFIG_NF_CONNTRACK_SECMARK
489 int len, ret;
490
491 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
492 if (ret)
493 return 0;
494
495 return nla_total_size(0) /* CTA_SECCTX */
496 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
497 #else
498 return 0;
499 #endif
500 }
501
502 static inline size_t
503 ctnetlink_timestamp_size(const struct nf_conn *ct)
504 {
505 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
506 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
507 return 0;
508 return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
509 #else
510 return 0;
511 #endif
512 }
513
514 static inline size_t
515 ctnetlink_nlmsg_size(const struct nf_conn *ct)
516 {
517 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
518 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
519 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
520 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
521 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
522 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
523 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
524 + ctnetlink_counters_size(ct)
525 + ctnetlink_timestamp_size(ct)
526 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
527 + nla_total_size(0) /* CTA_PROTOINFO */
528 + nla_total_size(0) /* CTA_HELP */
529 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
530 + ctnetlink_secctx_size(ct)
531 #ifdef CONFIG_NF_NAT_NEEDED
532 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
533 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
534 #endif
535 #ifdef CONFIG_NF_CONNTRACK_MARK
536 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
537 #endif
538 + ctnetlink_proto_size(ct)
539 ;
540 }
541
542 static int
543 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
544 {
545 struct net *net;
546 struct nlmsghdr *nlh;
547 struct nfgenmsg *nfmsg;
548 struct nlattr *nest_parms;
549 struct nf_conn *ct = item->ct;
550 struct sk_buff *skb;
551 unsigned int type;
552 unsigned int flags = 0, group;
553 int err;
554
555 /* ignore our fake conntrack entry */
556 if (nf_ct_is_untracked(ct))
557 return 0;
558
559 if (events & (1 << IPCT_DESTROY)) {
560 type = IPCTNL_MSG_CT_DELETE;
561 group = NFNLGRP_CONNTRACK_DESTROY;
562 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
563 type = IPCTNL_MSG_CT_NEW;
564 flags = NLM_F_CREATE|NLM_F_EXCL;
565 group = NFNLGRP_CONNTRACK_NEW;
566 } else if (events) {
567 type = IPCTNL_MSG_CT_NEW;
568 group = NFNLGRP_CONNTRACK_UPDATE;
569 } else
570 return 0;
571
572 net = nf_ct_net(ct);
573 if (!item->report && !nfnetlink_has_listeners(net, group))
574 return 0;
575
576 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
577 if (skb == NULL)
578 goto errout;
579
580 type |= NFNL_SUBSYS_CTNETLINK << 8;
581 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
582 if (nlh == NULL)
583 goto nlmsg_failure;
584
585 nfmsg = nlmsg_data(nlh);
586 nfmsg->nfgen_family = nf_ct_l3num(ct);
587 nfmsg->version = NFNETLINK_V0;
588 nfmsg->res_id = 0;
589
590 rcu_read_lock();
591 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
592 if (!nest_parms)
593 goto nla_put_failure;
594 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
595 goto nla_put_failure;
596 nla_nest_end(skb, nest_parms);
597
598 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
599 if (!nest_parms)
600 goto nla_put_failure;
601 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
602 goto nla_put_failure;
603 nla_nest_end(skb, nest_parms);
604
605 if (nf_ct_zone(ct))
606 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
607
608 if (ctnetlink_dump_id(skb, ct) < 0)
609 goto nla_put_failure;
610
611 if (ctnetlink_dump_status(skb, ct) < 0)
612 goto nla_put_failure;
613
614 if (events & (1 << IPCT_DESTROY)) {
615 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
616 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
617 ctnetlink_dump_timestamp(skb, ct) < 0)
618 goto nla_put_failure;
619 } else {
620 if (ctnetlink_dump_timeout(skb, ct) < 0)
621 goto nla_put_failure;
622
623 if (events & (1 << IPCT_PROTOINFO)
624 && ctnetlink_dump_protoinfo(skb, ct) < 0)
625 goto nla_put_failure;
626
627 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
628 && ctnetlink_dump_helpinfo(skb, ct) < 0)
629 goto nla_put_failure;
630
631 #ifdef CONFIG_NF_CONNTRACK_SECMARK
632 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
633 && ctnetlink_dump_secctx(skb, ct) < 0)
634 goto nla_put_failure;
635 #endif
636
637 if (events & (1 << IPCT_RELATED) &&
638 ctnetlink_dump_master(skb, ct) < 0)
639 goto nla_put_failure;
640
641 if (events & (1 << IPCT_NATSEQADJ) &&
642 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
643 goto nla_put_failure;
644 }
645
646 #ifdef CONFIG_NF_CONNTRACK_MARK
647 if ((events & (1 << IPCT_MARK) || ct->mark)
648 && ctnetlink_dump_mark(skb, ct) < 0)
649 goto nla_put_failure;
650 #endif
651 rcu_read_unlock();
652
653 nlmsg_end(skb, nlh);
654 err = nfnetlink_send(skb, net, item->pid, group, item->report,
655 GFP_ATOMIC);
656 if (err == -ENOBUFS || err == -EAGAIN)
657 return -ENOBUFS;
658
659 return 0;
660
661 nla_put_failure:
662 rcu_read_unlock();
663 nlmsg_cancel(skb, nlh);
664 nlmsg_failure:
665 kfree_skb(skb);
666 errout:
667 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
668 return -ENOBUFS;
669
670 return 0;
671 }
672 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
673
674 static int ctnetlink_done(struct netlink_callback *cb)
675 {
676 if (cb->args[1])
677 nf_ct_put((struct nf_conn *)cb->args[1]);
678 return 0;
679 }
680
681 static int
682 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
683 {
684 struct net *net = sock_net(skb->sk);
685 struct nf_conn *ct, *last;
686 struct nf_conntrack_tuple_hash *h;
687 struct hlist_nulls_node *n;
688 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
689 u_int8_t l3proto = nfmsg->nfgen_family;
690
691 spin_lock_bh(&nf_conntrack_lock);
692 last = (struct nf_conn *)cb->args[1];
693 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
694 restart:
695 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
696 hnnode) {
697 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
698 continue;
699 ct = nf_ct_tuplehash_to_ctrack(h);
700 /* Dump entries of a given L3 protocol number.
701 * If it is not specified, ie. l3proto == 0,
702 * then dump everything. */
703 if (l3proto && nf_ct_l3num(ct) != l3proto)
704 continue;
705 if (cb->args[1]) {
706 if (ct != last)
707 continue;
708 cb->args[1] = 0;
709 }
710 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
711 cb->nlh->nlmsg_seq,
712 IPCTNL_MSG_CT_NEW, ct) < 0) {
713 nf_conntrack_get(&ct->ct_general);
714 cb->args[1] = (unsigned long)ct;
715 goto out;
716 }
717
718 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
719 IPCTNL_MSG_CT_GET_CTRZERO) {
720 struct nf_conn_counter *acct;
721
722 acct = nf_conn_acct_find(ct);
723 if (acct) {
724 atomic64_set(&acct[IP_CT_DIR_ORIGINAL].bytes, 0);
725 atomic64_set(&acct[IP_CT_DIR_ORIGINAL].packets, 0);
726 atomic64_set(&acct[IP_CT_DIR_REPLY].bytes, 0);
727 atomic64_set(&acct[IP_CT_DIR_REPLY].packets, 0);
728 }
729 }
730 }
731 if (cb->args[1]) {
732 cb->args[1] = 0;
733 goto restart;
734 }
735 }
736 out:
737 spin_unlock_bh(&nf_conntrack_lock);
738 if (last)
739 nf_ct_put(last);
740
741 return skb->len;
742 }
743
744 static inline int
745 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
746 {
747 struct nlattr *tb[CTA_IP_MAX+1];
748 struct nf_conntrack_l3proto *l3proto;
749 int ret = 0;
750
751 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
752
753 rcu_read_lock();
754 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
755
756 if (likely(l3proto->nlattr_to_tuple)) {
757 ret = nla_validate_nested(attr, CTA_IP_MAX,
758 l3proto->nla_policy);
759 if (ret == 0)
760 ret = l3proto->nlattr_to_tuple(tb, tuple);
761 }
762
763 rcu_read_unlock();
764
765 return ret;
766 }
767
768 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
769 [CTA_PROTO_NUM] = { .type = NLA_U8 },
770 };
771
772 static inline int
773 ctnetlink_parse_tuple_proto(struct nlattr *attr,
774 struct nf_conntrack_tuple *tuple)
775 {
776 struct nlattr *tb[CTA_PROTO_MAX+1];
777 struct nf_conntrack_l4proto *l4proto;
778 int ret = 0;
779
780 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
781 if (ret < 0)
782 return ret;
783
784 if (!tb[CTA_PROTO_NUM])
785 return -EINVAL;
786 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
787
788 rcu_read_lock();
789 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
790
791 if (likely(l4proto->nlattr_to_tuple)) {
792 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
793 l4proto->nla_policy);
794 if (ret == 0)
795 ret = l4proto->nlattr_to_tuple(tb, tuple);
796 }
797
798 rcu_read_unlock();
799
800 return ret;
801 }
802
803 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
804 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
805 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
806 };
807
808 static int
809 ctnetlink_parse_tuple(const struct nlattr * const cda[],
810 struct nf_conntrack_tuple *tuple,
811 enum ctattr_type type, u_int8_t l3num)
812 {
813 struct nlattr *tb[CTA_TUPLE_MAX+1];
814 int err;
815
816 memset(tuple, 0, sizeof(*tuple));
817
818 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
819
820 if (!tb[CTA_TUPLE_IP])
821 return -EINVAL;
822
823 tuple->src.l3num = l3num;
824
825 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
826 if (err < 0)
827 return err;
828
829 if (!tb[CTA_TUPLE_PROTO])
830 return -EINVAL;
831
832 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
833 if (err < 0)
834 return err;
835
836 /* orig and expect tuples get DIR_ORIGINAL */
837 if (type == CTA_TUPLE_REPLY)
838 tuple->dst.dir = IP_CT_DIR_REPLY;
839 else
840 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
841
842 return 0;
843 }
844
845 static int
846 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
847 {
848 if (attr)
849 #ifdef CONFIG_NF_CONNTRACK_ZONES
850 *zone = ntohs(nla_get_be16(attr));
851 #else
852 return -EOPNOTSUPP;
853 #endif
854 else
855 *zone = 0;
856
857 return 0;
858 }
859
860 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
861 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
862 };
863
864 static inline int
865 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
866 {
867 struct nlattr *tb[CTA_HELP_MAX+1];
868
869 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
870
871 if (!tb[CTA_HELP_NAME])
872 return -EINVAL;
873
874 *helper_name = nla_data(tb[CTA_HELP_NAME]);
875
876 return 0;
877 }
878
879 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
880 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
881 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
882 [CTA_STATUS] = { .type = NLA_U32 },
883 [CTA_PROTOINFO] = { .type = NLA_NESTED },
884 [CTA_HELP] = { .type = NLA_NESTED },
885 [CTA_NAT_SRC] = { .type = NLA_NESTED },
886 [CTA_TIMEOUT] = { .type = NLA_U32 },
887 [CTA_MARK] = { .type = NLA_U32 },
888 [CTA_ID] = { .type = NLA_U32 },
889 [CTA_NAT_DST] = { .type = NLA_NESTED },
890 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
891 [CTA_ZONE] = { .type = NLA_U16 },
892 };
893
894 static int
895 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
896 const struct nlmsghdr *nlh,
897 const struct nlattr * const cda[])
898 {
899 struct net *net = sock_net(ctnl);
900 struct nf_conntrack_tuple_hash *h;
901 struct nf_conntrack_tuple tuple;
902 struct nf_conn *ct;
903 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
904 u_int8_t u3 = nfmsg->nfgen_family;
905 u16 zone;
906 int err;
907
908 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
909 if (err < 0)
910 return err;
911
912 if (cda[CTA_TUPLE_ORIG])
913 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
914 else if (cda[CTA_TUPLE_REPLY])
915 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
916 else {
917 /* Flush the whole table */
918 nf_conntrack_flush_report(net,
919 NETLINK_CB(skb).pid,
920 nlmsg_report(nlh));
921 return 0;
922 }
923
924 if (err < 0)
925 return err;
926
927 h = nf_conntrack_find_get(net, zone, &tuple);
928 if (!h)
929 return -ENOENT;
930
931 ct = nf_ct_tuplehash_to_ctrack(h);
932
933 if (cda[CTA_ID]) {
934 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
935 if (id != (u32)(unsigned long)ct) {
936 nf_ct_put(ct);
937 return -ENOENT;
938 }
939 }
940
941 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
942 NETLINK_CB(skb).pid,
943 nlmsg_report(nlh)) < 0) {
944 nf_ct_delete_from_lists(ct);
945 /* we failed to report the event, try later */
946 nf_ct_insert_dying_list(ct);
947 nf_ct_put(ct);
948 return 0;
949 }
950
951 /* death_by_timeout would report the event again */
952 set_bit(IPS_DYING_BIT, &ct->status);
953
954 nf_ct_kill(ct);
955 nf_ct_put(ct);
956
957 return 0;
958 }
959
960 static int
961 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
962 const struct nlmsghdr *nlh,
963 const struct nlattr * const cda[])
964 {
965 struct net *net = sock_net(ctnl);
966 struct nf_conntrack_tuple_hash *h;
967 struct nf_conntrack_tuple tuple;
968 struct nf_conn *ct;
969 struct sk_buff *skb2 = NULL;
970 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
971 u_int8_t u3 = nfmsg->nfgen_family;
972 u16 zone;
973 int err;
974
975 if (nlh->nlmsg_flags & NLM_F_DUMP)
976 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
977 ctnetlink_done, 0);
978
979 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
980 if (err < 0)
981 return err;
982
983 if (cda[CTA_TUPLE_ORIG])
984 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
985 else if (cda[CTA_TUPLE_REPLY])
986 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
987 else
988 return -EINVAL;
989
990 if (err < 0)
991 return err;
992
993 h = nf_conntrack_find_get(net, zone, &tuple);
994 if (!h)
995 return -ENOENT;
996
997 ct = nf_ct_tuplehash_to_ctrack(h);
998
999 err = -ENOMEM;
1000 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1001 if (skb2 == NULL) {
1002 nf_ct_put(ct);
1003 return -ENOMEM;
1004 }
1005
1006 rcu_read_lock();
1007 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
1008 IPCTNL_MSG_CT_NEW, ct);
1009 rcu_read_unlock();
1010 nf_ct_put(ct);
1011 if (err <= 0)
1012 goto free;
1013
1014 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1015 if (err < 0)
1016 goto out;
1017
1018 return 0;
1019
1020 free:
1021 kfree_skb(skb2);
1022 out:
1023 /* this avoids a loop in nfnetlink. */
1024 return err == -EAGAIN ? -ENOBUFS : err;
1025 }
1026
1027 #ifdef CONFIG_NF_NAT_NEEDED
1028 static int
1029 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1030 enum nf_nat_manip_type manip,
1031 const struct nlattr *attr)
1032 {
1033 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1034
1035 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1036 if (!parse_nat_setup) {
1037 #ifdef CONFIG_MODULES
1038 rcu_read_unlock();
1039 spin_unlock_bh(&nf_conntrack_lock);
1040 nfnl_unlock();
1041 if (request_module("nf-nat-ipv4") < 0) {
1042 nfnl_lock();
1043 spin_lock_bh(&nf_conntrack_lock);
1044 rcu_read_lock();
1045 return -EOPNOTSUPP;
1046 }
1047 nfnl_lock();
1048 spin_lock_bh(&nf_conntrack_lock);
1049 rcu_read_lock();
1050 if (nfnetlink_parse_nat_setup_hook)
1051 return -EAGAIN;
1052 #endif
1053 return -EOPNOTSUPP;
1054 }
1055
1056 return parse_nat_setup(ct, manip, attr);
1057 }
1058 #endif
1059
1060 static int
1061 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1062 {
1063 unsigned long d;
1064 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1065 d = ct->status ^ status;
1066
1067 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1068 /* unchangeable */
1069 return -EBUSY;
1070
1071 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1072 /* SEEN_REPLY bit can only be set */
1073 return -EBUSY;
1074
1075 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1076 /* ASSURED bit can only be set */
1077 return -EBUSY;
1078
1079 /* Be careful here, modifying NAT bits can screw up things,
1080 * so don't let users modify them directly if they don't pass
1081 * nf_nat_range. */
1082 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1083 return 0;
1084 }
1085
1086 static int
1087 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1088 {
1089 #ifdef CONFIG_NF_NAT_NEEDED
1090 int ret;
1091
1092 if (cda[CTA_NAT_DST]) {
1093 ret = ctnetlink_parse_nat_setup(ct,
1094 IP_NAT_MANIP_DST,
1095 cda[CTA_NAT_DST]);
1096 if (ret < 0)
1097 return ret;
1098 }
1099 if (cda[CTA_NAT_SRC]) {
1100 ret = ctnetlink_parse_nat_setup(ct,
1101 IP_NAT_MANIP_SRC,
1102 cda[CTA_NAT_SRC]);
1103 if (ret < 0)
1104 return ret;
1105 }
1106 return 0;
1107 #else
1108 return -EOPNOTSUPP;
1109 #endif
1110 }
1111
1112 static inline int
1113 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1114 {
1115 struct nf_conntrack_helper *helper;
1116 struct nf_conn_help *help = nfct_help(ct);
1117 char *helpname = NULL;
1118 int err;
1119
1120 /* don't change helper of sibling connections */
1121 if (ct->master)
1122 return -EBUSY;
1123
1124 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1125 if (err < 0)
1126 return err;
1127
1128 if (!strcmp(helpname, "")) {
1129 if (help && help->helper) {
1130 /* we had a helper before ... */
1131 nf_ct_remove_expectations(ct);
1132 RCU_INIT_POINTER(help->helper, NULL);
1133 }
1134
1135 return 0;
1136 }
1137
1138 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1139 nf_ct_protonum(ct));
1140 if (helper == NULL) {
1141 #ifdef CONFIG_MODULES
1142 spin_unlock_bh(&nf_conntrack_lock);
1143
1144 if (request_module("nfct-helper-%s", helpname) < 0) {
1145 spin_lock_bh(&nf_conntrack_lock);
1146 return -EOPNOTSUPP;
1147 }
1148
1149 spin_lock_bh(&nf_conntrack_lock);
1150 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1151 nf_ct_protonum(ct));
1152 if (helper)
1153 return -EAGAIN;
1154 #endif
1155 return -EOPNOTSUPP;
1156 }
1157
1158 if (help) {
1159 if (help->helper == helper)
1160 return 0;
1161 if (help->helper)
1162 return -EBUSY;
1163 /* need to zero data of old helper */
1164 memset(&help->help, 0, sizeof(help->help));
1165 } else {
1166 /* we cannot set a helper for an existing conntrack */
1167 return -EOPNOTSUPP;
1168 }
1169
1170 RCU_INIT_POINTER(help->helper, helper);
1171
1172 return 0;
1173 }
1174
1175 static inline int
1176 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1177 {
1178 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1179
1180 if (!del_timer(&ct->timeout))
1181 return -ETIME;
1182
1183 ct->timeout.expires = jiffies + timeout * HZ;
1184 add_timer(&ct->timeout);
1185
1186 return 0;
1187 }
1188
1189 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1190 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1191 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1192 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1193 };
1194
1195 static inline int
1196 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1197 {
1198 const struct nlattr *attr = cda[CTA_PROTOINFO];
1199 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1200 struct nf_conntrack_l4proto *l4proto;
1201 int err = 0;
1202
1203 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1204
1205 rcu_read_lock();
1206 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1207 if (l4proto->from_nlattr)
1208 err = l4proto->from_nlattr(tb, ct);
1209 rcu_read_unlock();
1210
1211 return err;
1212 }
1213
1214 #ifdef CONFIG_NF_NAT_NEEDED
1215 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1216 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1217 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1218 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1219 };
1220
1221 static inline int
1222 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1223 {
1224 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1225
1226 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1227
1228 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1229 return -EINVAL;
1230
1231 natseq->correction_pos =
1232 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1233
1234 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1235 return -EINVAL;
1236
1237 natseq->offset_before =
1238 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1239
1240 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1241 return -EINVAL;
1242
1243 natseq->offset_after =
1244 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1245
1246 return 0;
1247 }
1248
1249 static int
1250 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1251 const struct nlattr * const cda[])
1252 {
1253 int ret = 0;
1254 struct nf_conn_nat *nat = nfct_nat(ct);
1255
1256 if (!nat)
1257 return 0;
1258
1259 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1260 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1261 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1262 if (ret < 0)
1263 return ret;
1264
1265 ct->status |= IPS_SEQ_ADJUST;
1266 }
1267
1268 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1269 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1270 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1271 if (ret < 0)
1272 return ret;
1273
1274 ct->status |= IPS_SEQ_ADJUST;
1275 }
1276
1277 return 0;
1278 }
1279 #endif
1280
1281 static int
1282 ctnetlink_change_conntrack(struct nf_conn *ct,
1283 const struct nlattr * const cda[])
1284 {
1285 int err;
1286
1287 /* only allow NAT changes and master assignation for new conntracks */
1288 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1289 return -EOPNOTSUPP;
1290
1291 if (cda[CTA_HELP]) {
1292 err = ctnetlink_change_helper(ct, cda);
1293 if (err < 0)
1294 return err;
1295 }
1296
1297 if (cda[CTA_TIMEOUT]) {
1298 err = ctnetlink_change_timeout(ct, cda);
1299 if (err < 0)
1300 return err;
1301 }
1302
1303 if (cda[CTA_STATUS]) {
1304 err = ctnetlink_change_status(ct, cda);
1305 if (err < 0)
1306 return err;
1307 }
1308
1309 if (cda[CTA_PROTOINFO]) {
1310 err = ctnetlink_change_protoinfo(ct, cda);
1311 if (err < 0)
1312 return err;
1313 }
1314
1315 #if defined(CONFIG_NF_CONNTRACK_MARK)
1316 if (cda[CTA_MARK])
1317 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1318 #endif
1319
1320 #ifdef CONFIG_NF_NAT_NEEDED
1321 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1322 err = ctnetlink_change_nat_seq_adj(ct, cda);
1323 if (err < 0)
1324 return err;
1325 }
1326 #endif
1327
1328 return 0;
1329 }
1330
1331 static struct nf_conn *
1332 ctnetlink_create_conntrack(struct net *net, u16 zone,
1333 const struct nlattr * const cda[],
1334 struct nf_conntrack_tuple *otuple,
1335 struct nf_conntrack_tuple *rtuple,
1336 u8 u3)
1337 {
1338 struct nf_conn *ct;
1339 int err = -EINVAL;
1340 struct nf_conntrack_helper *helper;
1341 struct nf_conn_tstamp *tstamp;
1342
1343 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1344 if (IS_ERR(ct))
1345 return ERR_PTR(-ENOMEM);
1346
1347 if (!cda[CTA_TIMEOUT])
1348 goto err1;
1349 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1350
1351 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1352
1353 rcu_read_lock();
1354 if (cda[CTA_HELP]) {
1355 char *helpname = NULL;
1356
1357 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1358 if (err < 0)
1359 goto err2;
1360
1361 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1362 nf_ct_protonum(ct));
1363 if (helper == NULL) {
1364 rcu_read_unlock();
1365 #ifdef CONFIG_MODULES
1366 if (request_module("nfct-helper-%s", helpname) < 0) {
1367 err = -EOPNOTSUPP;
1368 goto err1;
1369 }
1370
1371 rcu_read_lock();
1372 helper = __nf_conntrack_helper_find(helpname,
1373 nf_ct_l3num(ct),
1374 nf_ct_protonum(ct));
1375 if (helper) {
1376 err = -EAGAIN;
1377 goto err2;
1378 }
1379 rcu_read_unlock();
1380 #endif
1381 err = -EOPNOTSUPP;
1382 goto err1;
1383 } else {
1384 struct nf_conn_help *help;
1385
1386 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1387 if (help == NULL) {
1388 err = -ENOMEM;
1389 goto err2;
1390 }
1391
1392 /* not in hash table yet so not strictly necessary */
1393 RCU_INIT_POINTER(help->helper, helper);
1394 }
1395 } else {
1396 /* try an implicit helper assignation */
1397 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1398 if (err < 0)
1399 goto err2;
1400 }
1401
1402 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1403 err = ctnetlink_change_nat(ct, cda);
1404 if (err < 0)
1405 goto err2;
1406 }
1407
1408 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1409 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1410 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1411 /* we must add conntrack extensions before confirmation. */
1412 ct->status |= IPS_CONFIRMED;
1413
1414 if (cda[CTA_STATUS]) {
1415 err = ctnetlink_change_status(ct, cda);
1416 if (err < 0)
1417 goto err2;
1418 }
1419
1420 #ifdef CONFIG_NF_NAT_NEEDED
1421 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1422 err = ctnetlink_change_nat_seq_adj(ct, cda);
1423 if (err < 0)
1424 goto err2;
1425 }
1426 #endif
1427
1428 memset(&ct->proto, 0, sizeof(ct->proto));
1429 if (cda[CTA_PROTOINFO]) {
1430 err = ctnetlink_change_protoinfo(ct, cda);
1431 if (err < 0)
1432 goto err2;
1433 }
1434
1435 #if defined(CONFIG_NF_CONNTRACK_MARK)
1436 if (cda[CTA_MARK])
1437 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1438 #endif
1439
1440 /* setup master conntrack: this is a confirmed expectation */
1441 if (cda[CTA_TUPLE_MASTER]) {
1442 struct nf_conntrack_tuple master;
1443 struct nf_conntrack_tuple_hash *master_h;
1444 struct nf_conn *master_ct;
1445
1446 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1447 if (err < 0)
1448 goto err2;
1449
1450 master_h = nf_conntrack_find_get(net, zone, &master);
1451 if (master_h == NULL) {
1452 err = -ENOENT;
1453 goto err2;
1454 }
1455 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1456 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1457 ct->master = master_ct;
1458 }
1459 tstamp = nf_conn_tstamp_find(ct);
1460 if (tstamp)
1461 tstamp->start = ktime_to_ns(ktime_get_real());
1462
1463 add_timer(&ct->timeout);
1464 nf_conntrack_hash_insert(ct);
1465 rcu_read_unlock();
1466
1467 return ct;
1468
1469 err2:
1470 rcu_read_unlock();
1471 err1:
1472 nf_conntrack_free(ct);
1473 return ERR_PTR(err);
1474 }
1475
1476 static int
1477 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1478 const struct nlmsghdr *nlh,
1479 const struct nlattr * const cda[])
1480 {
1481 struct net *net = sock_net(ctnl);
1482 struct nf_conntrack_tuple otuple, rtuple;
1483 struct nf_conntrack_tuple_hash *h = NULL;
1484 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1485 u_int8_t u3 = nfmsg->nfgen_family;
1486 u16 zone;
1487 int err;
1488
1489 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1490 if (err < 0)
1491 return err;
1492
1493 if (cda[CTA_TUPLE_ORIG]) {
1494 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1495 if (err < 0)
1496 return err;
1497 }
1498
1499 if (cda[CTA_TUPLE_REPLY]) {
1500 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1501 if (err < 0)
1502 return err;
1503 }
1504
1505 spin_lock_bh(&nf_conntrack_lock);
1506 if (cda[CTA_TUPLE_ORIG])
1507 h = __nf_conntrack_find(net, zone, &otuple);
1508 else if (cda[CTA_TUPLE_REPLY])
1509 h = __nf_conntrack_find(net, zone, &rtuple);
1510
1511 if (h == NULL) {
1512 err = -ENOENT;
1513 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1514 struct nf_conn *ct;
1515 enum ip_conntrack_events events;
1516
1517 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1518 &rtuple, u3);
1519 if (IS_ERR(ct)) {
1520 err = PTR_ERR(ct);
1521 goto out_unlock;
1522 }
1523 err = 0;
1524 nf_conntrack_get(&ct->ct_general);
1525 spin_unlock_bh(&nf_conntrack_lock);
1526 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1527 events = IPCT_RELATED;
1528 else
1529 events = IPCT_NEW;
1530
1531 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1532 (1 << IPCT_ASSURED) |
1533 (1 << IPCT_HELPER) |
1534 (1 << IPCT_PROTOINFO) |
1535 (1 << IPCT_NATSEQADJ) |
1536 (1 << IPCT_MARK) | events,
1537 ct, NETLINK_CB(skb).pid,
1538 nlmsg_report(nlh));
1539 nf_ct_put(ct);
1540 } else
1541 spin_unlock_bh(&nf_conntrack_lock);
1542
1543 return err;
1544 }
1545 /* implicit 'else' */
1546
1547 /* We manipulate the conntrack inside the global conntrack table lock,
1548 * so there's no need to increase the refcount */
1549 err = -EEXIST;
1550 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1551 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1552
1553 err = ctnetlink_change_conntrack(ct, cda);
1554 if (err == 0) {
1555 nf_conntrack_get(&ct->ct_general);
1556 spin_unlock_bh(&nf_conntrack_lock);
1557 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1558 (1 << IPCT_ASSURED) |
1559 (1 << IPCT_HELPER) |
1560 (1 << IPCT_PROTOINFO) |
1561 (1 << IPCT_NATSEQADJ) |
1562 (1 << IPCT_MARK),
1563 ct, NETLINK_CB(skb).pid,
1564 nlmsg_report(nlh));
1565 nf_ct_put(ct);
1566 } else
1567 spin_unlock_bh(&nf_conntrack_lock);
1568
1569 return err;
1570 }
1571
1572 out_unlock:
1573 spin_unlock_bh(&nf_conntrack_lock);
1574 return err;
1575 }
1576
1577 /***********************************************************************
1578 * EXPECT
1579 ***********************************************************************/
1580
1581 static inline int
1582 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1583 const struct nf_conntrack_tuple *tuple,
1584 enum ctattr_expect type)
1585 {
1586 struct nlattr *nest_parms;
1587
1588 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1589 if (!nest_parms)
1590 goto nla_put_failure;
1591 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1592 goto nla_put_failure;
1593 nla_nest_end(skb, nest_parms);
1594
1595 return 0;
1596
1597 nla_put_failure:
1598 return -1;
1599 }
1600
1601 static inline int
1602 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1603 const struct nf_conntrack_tuple *tuple,
1604 const struct nf_conntrack_tuple_mask *mask)
1605 {
1606 int ret;
1607 struct nf_conntrack_l3proto *l3proto;
1608 struct nf_conntrack_l4proto *l4proto;
1609 struct nf_conntrack_tuple m;
1610 struct nlattr *nest_parms;
1611
1612 memset(&m, 0xFF, sizeof(m));
1613 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1614 m.src.u.all = mask->src.u.all;
1615 m.dst.protonum = tuple->dst.protonum;
1616
1617 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1618 if (!nest_parms)
1619 goto nla_put_failure;
1620
1621 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1622 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1623
1624 if (unlikely(ret < 0))
1625 goto nla_put_failure;
1626
1627 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1628 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1629 if (unlikely(ret < 0))
1630 goto nla_put_failure;
1631
1632 nla_nest_end(skb, nest_parms);
1633
1634 return 0;
1635
1636 nla_put_failure:
1637 return -1;
1638 }
1639
1640 static int
1641 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1642 const struct nf_conntrack_expect *exp)
1643 {
1644 struct nf_conn *master = exp->master;
1645 long timeout = (exp->timeout.expires - jiffies) / HZ;
1646 struct nf_conn_help *help;
1647
1648 if (timeout < 0)
1649 timeout = 0;
1650
1651 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1652 goto nla_put_failure;
1653 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1654 goto nla_put_failure;
1655 if (ctnetlink_exp_dump_tuple(skb,
1656 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1657 CTA_EXPECT_MASTER) < 0)
1658 goto nla_put_failure;
1659
1660 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1661 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1662 NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1663 help = nfct_help(master);
1664 if (help) {
1665 struct nf_conntrack_helper *helper;
1666
1667 helper = rcu_dereference(help->helper);
1668 if (helper)
1669 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1670 }
1671
1672 return 0;
1673
1674 nla_put_failure:
1675 return -1;
1676 }
1677
1678 static int
1679 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1680 int event, const struct nf_conntrack_expect *exp)
1681 {
1682 struct nlmsghdr *nlh;
1683 struct nfgenmsg *nfmsg;
1684 unsigned int flags = pid ? NLM_F_MULTI : 0;
1685
1686 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1687 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1688 if (nlh == NULL)
1689 goto nlmsg_failure;
1690
1691 nfmsg = nlmsg_data(nlh);
1692 nfmsg->nfgen_family = exp->tuple.src.l3num;
1693 nfmsg->version = NFNETLINK_V0;
1694 nfmsg->res_id = 0;
1695
1696 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1697 goto nla_put_failure;
1698
1699 nlmsg_end(skb, nlh);
1700 return skb->len;
1701
1702 nlmsg_failure:
1703 nla_put_failure:
1704 nlmsg_cancel(skb, nlh);
1705 return -1;
1706 }
1707
1708 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1709 static int
1710 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1711 {
1712 struct nf_conntrack_expect *exp = item->exp;
1713 struct net *net = nf_ct_exp_net(exp);
1714 struct nlmsghdr *nlh;
1715 struct nfgenmsg *nfmsg;
1716 struct sk_buff *skb;
1717 unsigned int type, group;
1718 int flags = 0;
1719
1720 if (events & (1 << IPEXP_DESTROY)) {
1721 type = IPCTNL_MSG_EXP_DELETE;
1722 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1723 } else if (events & (1 << IPEXP_NEW)) {
1724 type = IPCTNL_MSG_EXP_NEW;
1725 flags = NLM_F_CREATE|NLM_F_EXCL;
1726 group = NFNLGRP_CONNTRACK_EXP_NEW;
1727 } else
1728 return 0;
1729
1730 if (!item->report && !nfnetlink_has_listeners(net, group))
1731 return 0;
1732
1733 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1734 if (skb == NULL)
1735 goto errout;
1736
1737 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1738 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1739 if (nlh == NULL)
1740 goto nlmsg_failure;
1741
1742 nfmsg = nlmsg_data(nlh);
1743 nfmsg->nfgen_family = exp->tuple.src.l3num;
1744 nfmsg->version = NFNETLINK_V0;
1745 nfmsg->res_id = 0;
1746
1747 rcu_read_lock();
1748 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1749 goto nla_put_failure;
1750 rcu_read_unlock();
1751
1752 nlmsg_end(skb, nlh);
1753 nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1754 return 0;
1755
1756 nla_put_failure:
1757 rcu_read_unlock();
1758 nlmsg_cancel(skb, nlh);
1759 nlmsg_failure:
1760 kfree_skb(skb);
1761 errout:
1762 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1763 return 0;
1764 }
1765 #endif
1766 static int ctnetlink_exp_done(struct netlink_callback *cb)
1767 {
1768 if (cb->args[1])
1769 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1770 return 0;
1771 }
1772
1773 static int
1774 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1775 {
1776 struct net *net = sock_net(skb->sk);
1777 struct nf_conntrack_expect *exp, *last;
1778 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1779 struct hlist_node *n;
1780 u_int8_t l3proto = nfmsg->nfgen_family;
1781
1782 rcu_read_lock();
1783 last = (struct nf_conntrack_expect *)cb->args[1];
1784 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1785 restart:
1786 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1787 hnode) {
1788 if (l3proto && exp->tuple.src.l3num != l3proto)
1789 continue;
1790 if (cb->args[1]) {
1791 if (exp != last)
1792 continue;
1793 cb->args[1] = 0;
1794 }
1795 if (ctnetlink_exp_fill_info(skb,
1796 NETLINK_CB(cb->skb).pid,
1797 cb->nlh->nlmsg_seq,
1798 IPCTNL_MSG_EXP_NEW,
1799 exp) < 0) {
1800 if (!atomic_inc_not_zero(&exp->use))
1801 continue;
1802 cb->args[1] = (unsigned long)exp;
1803 goto out;
1804 }
1805 }
1806 if (cb->args[1]) {
1807 cb->args[1] = 0;
1808 goto restart;
1809 }
1810 }
1811 out:
1812 rcu_read_unlock();
1813 if (last)
1814 nf_ct_expect_put(last);
1815
1816 return skb->len;
1817 }
1818
1819 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1820 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1821 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1822 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1823 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1824 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1825 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1826 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
1827 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
1828 };
1829
1830 static int
1831 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1832 const struct nlmsghdr *nlh,
1833 const struct nlattr * const cda[])
1834 {
1835 struct net *net = sock_net(ctnl);
1836 struct nf_conntrack_tuple tuple;
1837 struct nf_conntrack_expect *exp;
1838 struct sk_buff *skb2;
1839 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1840 u_int8_t u3 = nfmsg->nfgen_family;
1841 u16 zone;
1842 int err;
1843
1844 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1845 return netlink_dump_start(ctnl, skb, nlh,
1846 ctnetlink_exp_dump_table,
1847 ctnetlink_exp_done, 0);
1848 }
1849
1850 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1851 if (err < 0)
1852 return err;
1853
1854 if (cda[CTA_EXPECT_TUPLE])
1855 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1856 else if (cda[CTA_EXPECT_MASTER])
1857 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1858 else
1859 return -EINVAL;
1860
1861 if (err < 0)
1862 return err;
1863
1864 exp = nf_ct_expect_find_get(net, zone, &tuple);
1865 if (!exp)
1866 return -ENOENT;
1867
1868 if (cda[CTA_EXPECT_ID]) {
1869 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1870 if (ntohl(id) != (u32)(unsigned long)exp) {
1871 nf_ct_expect_put(exp);
1872 return -ENOENT;
1873 }
1874 }
1875
1876 err = -ENOMEM;
1877 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1878 if (skb2 == NULL)
1879 goto out;
1880
1881 rcu_read_lock();
1882 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1883 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1884 rcu_read_unlock();
1885 if (err <= 0)
1886 goto free;
1887
1888 nf_ct_expect_put(exp);
1889
1890 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1891
1892 free:
1893 kfree_skb(skb2);
1894 out:
1895 nf_ct_expect_put(exp);
1896 return err;
1897 }
1898
1899 static int
1900 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1901 const struct nlmsghdr *nlh,
1902 const struct nlattr * const cda[])
1903 {
1904 struct net *net = sock_net(ctnl);
1905 struct nf_conntrack_expect *exp;
1906 struct nf_conntrack_tuple tuple;
1907 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1908 struct hlist_node *n, *next;
1909 u_int8_t u3 = nfmsg->nfgen_family;
1910 unsigned int i;
1911 u16 zone;
1912 int err;
1913
1914 if (cda[CTA_EXPECT_TUPLE]) {
1915 /* delete a single expect by tuple */
1916 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1917 if (err < 0)
1918 return err;
1919
1920 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1921 if (err < 0)
1922 return err;
1923
1924 /* bump usage count to 2 */
1925 exp = nf_ct_expect_find_get(net, zone, &tuple);
1926 if (!exp)
1927 return -ENOENT;
1928
1929 if (cda[CTA_EXPECT_ID]) {
1930 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1931 if (ntohl(id) != (u32)(unsigned long)exp) {
1932 nf_ct_expect_put(exp);
1933 return -ENOENT;
1934 }
1935 }
1936
1937 /* after list removal, usage count == 1 */
1938 spin_lock_bh(&nf_conntrack_lock);
1939 if (del_timer(&exp->timeout)) {
1940 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1941 nlmsg_report(nlh));
1942 nf_ct_expect_put(exp);
1943 }
1944 spin_unlock_bh(&nf_conntrack_lock);
1945 /* have to put what we 'get' above.
1946 * after this line usage count == 0 */
1947 nf_ct_expect_put(exp);
1948 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1949 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1950 struct nf_conn_help *m_help;
1951
1952 /* delete all expectations for this helper */
1953 spin_lock_bh(&nf_conntrack_lock);
1954 for (i = 0; i < nf_ct_expect_hsize; i++) {
1955 hlist_for_each_entry_safe(exp, n, next,
1956 &net->ct.expect_hash[i],
1957 hnode) {
1958 m_help = nfct_help(exp->master);
1959 if (!strcmp(m_help->helper->name, name) &&
1960 del_timer(&exp->timeout)) {
1961 nf_ct_unlink_expect_report(exp,
1962 NETLINK_CB(skb).pid,
1963 nlmsg_report(nlh));
1964 nf_ct_expect_put(exp);
1965 }
1966 }
1967 }
1968 spin_unlock_bh(&nf_conntrack_lock);
1969 } else {
1970 /* This basically means we have to flush everything*/
1971 spin_lock_bh(&nf_conntrack_lock);
1972 for (i = 0; i < nf_ct_expect_hsize; i++) {
1973 hlist_for_each_entry_safe(exp, n, next,
1974 &net->ct.expect_hash[i],
1975 hnode) {
1976 if (del_timer(&exp->timeout)) {
1977 nf_ct_unlink_expect_report(exp,
1978 NETLINK_CB(skb).pid,
1979 nlmsg_report(nlh));
1980 nf_ct_expect_put(exp);
1981 }
1982 }
1983 }
1984 spin_unlock_bh(&nf_conntrack_lock);
1985 }
1986
1987 return 0;
1988 }
1989 static int
1990 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1991 const struct nlattr * const cda[])
1992 {
1993 return -EOPNOTSUPP;
1994 }
1995
1996 static int
1997 ctnetlink_create_expect(struct net *net, u16 zone,
1998 const struct nlattr * const cda[],
1999 u_int8_t u3,
2000 u32 pid, int report)
2001 {
2002 struct nf_conntrack_tuple tuple, mask, master_tuple;
2003 struct nf_conntrack_tuple_hash *h = NULL;
2004 struct nf_conntrack_expect *exp;
2005 struct nf_conn *ct;
2006 struct nf_conn_help *help;
2007 int err = 0;
2008
2009 /* caller guarantees that those three CTA_EXPECT_* exist */
2010 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2011 if (err < 0)
2012 return err;
2013 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2014 if (err < 0)
2015 return err;
2016 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2017 if (err < 0)
2018 return err;
2019
2020 /* Look for master conntrack of this expectation */
2021 h = nf_conntrack_find_get(net, zone, &master_tuple);
2022 if (!h)
2023 return -ENOENT;
2024 ct = nf_ct_tuplehash_to_ctrack(h);
2025 exp = nf_ct_expect_alloc(ct);
2026 if (!exp) {
2027 err = -ENOMEM;
2028 goto out;
2029 }
2030 help = nfct_help(ct);
2031 if (!help) {
2032 if (!cda[CTA_EXPECT_TIMEOUT]) {
2033 err = -EINVAL;
2034 goto out;
2035 }
2036 exp->timeout.expires =
2037 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2038
2039 exp->flags = NF_CT_EXPECT_USERSPACE;
2040 if (cda[CTA_EXPECT_FLAGS]) {
2041 exp->flags |=
2042 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2043 }
2044 } else {
2045 if (cda[CTA_EXPECT_FLAGS]) {
2046 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2047 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2048 } else
2049 exp->flags = 0;
2050 }
2051
2052 exp->class = 0;
2053 exp->expectfn = NULL;
2054 exp->master = ct;
2055 exp->helper = NULL;
2056 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2057 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2058 exp->mask.src.u.all = mask.src.u.all;
2059
2060 err = nf_ct_expect_related_report(exp, pid, report);
2061 nf_ct_expect_put(exp);
2062
2063 out:
2064 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2065 return err;
2066 }
2067
2068 static int
2069 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2070 const struct nlmsghdr *nlh,
2071 const struct nlattr * const cda[])
2072 {
2073 struct net *net = sock_net(ctnl);
2074 struct nf_conntrack_tuple tuple;
2075 struct nf_conntrack_expect *exp;
2076 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2077 u_int8_t u3 = nfmsg->nfgen_family;
2078 u16 zone;
2079 int err;
2080
2081 if (!cda[CTA_EXPECT_TUPLE]
2082 || !cda[CTA_EXPECT_MASK]
2083 || !cda[CTA_EXPECT_MASTER])
2084 return -EINVAL;
2085
2086 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2087 if (err < 0)
2088 return err;
2089
2090 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2091 if (err < 0)
2092 return err;
2093
2094 spin_lock_bh(&nf_conntrack_lock);
2095 exp = __nf_ct_expect_find(net, zone, &tuple);
2096
2097 if (!exp) {
2098 spin_unlock_bh(&nf_conntrack_lock);
2099 err = -ENOENT;
2100 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2101 err = ctnetlink_create_expect(net, zone, cda,
2102 u3,
2103 NETLINK_CB(skb).pid,
2104 nlmsg_report(nlh));
2105 }
2106 return err;
2107 }
2108
2109 err = -EEXIST;
2110 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2111 err = ctnetlink_change_expect(exp, cda);
2112 spin_unlock_bh(&nf_conntrack_lock);
2113
2114 return err;
2115 }
2116
2117 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2118 static struct nf_ct_event_notifier ctnl_notifier = {
2119 .fcn = ctnetlink_conntrack_event,
2120 };
2121
2122 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2123 .fcn = ctnetlink_expect_event,
2124 };
2125 #endif
2126
2127 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2128 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2129 .attr_count = CTA_MAX,
2130 .policy = ct_nla_policy },
2131 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2132 .attr_count = CTA_MAX,
2133 .policy = ct_nla_policy },
2134 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2135 .attr_count = CTA_MAX,
2136 .policy = ct_nla_policy },
2137 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2138 .attr_count = CTA_MAX,
2139 .policy = ct_nla_policy },
2140 };
2141
2142 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2143 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2144 .attr_count = CTA_EXPECT_MAX,
2145 .policy = exp_nla_policy },
2146 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2147 .attr_count = CTA_EXPECT_MAX,
2148 .policy = exp_nla_policy },
2149 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2150 .attr_count = CTA_EXPECT_MAX,
2151 .policy = exp_nla_policy },
2152 };
2153
2154 static const struct nfnetlink_subsystem ctnl_subsys = {
2155 .name = "conntrack",
2156 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2157 .cb_count = IPCTNL_MSG_MAX,
2158 .cb = ctnl_cb,
2159 };
2160
2161 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2162 .name = "conntrack_expect",
2163 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2164 .cb_count = IPCTNL_MSG_EXP_MAX,
2165 .cb = ctnl_exp_cb,
2166 };
2167
2168 MODULE_ALIAS("ip_conntrack_netlink");
2169 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2170 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2171
2172 static int __net_init ctnetlink_net_init(struct net *net)
2173 {
2174 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2175 int ret;
2176
2177 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
2178 if (ret < 0) {
2179 pr_err("ctnetlink_init: cannot register notifier.\n");
2180 goto err_out;
2181 }
2182
2183 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
2184 if (ret < 0) {
2185 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2186 goto err_unreg_notifier;
2187 }
2188 #endif
2189 return 0;
2190
2191 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2192 err_unreg_notifier:
2193 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2194 err_out:
2195 return ret;
2196 #endif
2197 }
2198
2199 static void ctnetlink_net_exit(struct net *net)
2200 {
2201 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2202 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
2203 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2204 #endif
2205 }
2206
2207 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
2208 {
2209 struct net *net;
2210
2211 list_for_each_entry(net, net_exit_list, exit_list)
2212 ctnetlink_net_exit(net);
2213 }
2214
2215 static struct pernet_operations ctnetlink_net_ops = {
2216 .init = ctnetlink_net_init,
2217 .exit_batch = ctnetlink_net_exit_batch,
2218 };
2219
2220 static int __init ctnetlink_init(void)
2221 {
2222 int ret;
2223
2224 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2225 ret = nfnetlink_subsys_register(&ctnl_subsys);
2226 if (ret < 0) {
2227 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2228 goto err_out;
2229 }
2230
2231 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2232 if (ret < 0) {
2233 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2234 goto err_unreg_subsys;
2235 }
2236
2237 if (register_pernet_subsys(&ctnetlink_net_ops)) {
2238 pr_err("ctnetlink_init: cannot register pernet operations\n");
2239 goto err_unreg_exp_subsys;
2240 }
2241
2242 return 0;
2243
2244 err_unreg_exp_subsys:
2245 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2246 err_unreg_subsys:
2247 nfnetlink_subsys_unregister(&ctnl_subsys);
2248 err_out:
2249 return ret;
2250 }
2251
2252 static void __exit ctnetlink_exit(void)
2253 {
2254 pr_info("ctnetlink: unregistering from nfnetlink.\n");
2255
2256 nf_ct_remove_userspace_expectations();
2257 unregister_pernet_subsys(&ctnetlink_net_ops);
2258 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2259 nfnetlink_subsys_unregister(&ctnl_subsys);
2260 }
2261
2262 module_init(ctnetlink_init);
2263 module_exit(ctnetlink_exit);
Linux 2.6 libata-dev (mirror)