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netfilter: ctnetlink: fix refcnt leak in dying/unconfirmed list dumper
[mirror_ubuntu-artful-kernel.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) 2005-2012 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_seqadj.h>
41 #include <net/netfilter/nf_conntrack_l3proto.h>
42 #include <net/netfilter/nf_conntrack_l4proto.h>
43 #include <net/netfilter/nf_conntrack_tuple.h>
44 #include <net/netfilter/nf_conntrack_acct.h>
45 #include <net/netfilter/nf_conntrack_zones.h>
46 #include <net/netfilter/nf_conntrack_timestamp.h>
47 #include <net/netfilter/nf_conntrack_labels.h>
48 #ifdef CONFIG_NF_NAT_NEEDED
49 #include <net/netfilter/nf_nat_core.h>
50 #include <net/netfilter/nf_nat_l4proto.h>
51 #include <net/netfilter/nf_nat_helper.h>
52 #endif
53
54 #include <linux/netfilter/nfnetlink.h>
55 #include <linux/netfilter/nfnetlink_conntrack.h>
56
57 MODULE_LICENSE("GPL");
58
59 static char __initdata version[] = "0.93";
60
61 static inline int
62 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
63 const struct nf_conntrack_tuple *tuple,
64 struct nf_conntrack_l4proto *l4proto)
65 {
66 int ret = 0;
67 struct nlattr *nest_parms;
68
69 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
70 if (!nest_parms)
71 goto nla_put_failure;
72 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
73 goto nla_put_failure;
74
75 if (likely(l4proto->tuple_to_nlattr))
76 ret = l4proto->tuple_to_nlattr(skb, tuple);
77
78 nla_nest_end(skb, nest_parms);
79
80 return ret;
81
82 nla_put_failure:
83 return -1;
84 }
85
86 static inline int
87 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
88 const struct nf_conntrack_tuple *tuple,
89 struct nf_conntrack_l3proto *l3proto)
90 {
91 int ret = 0;
92 struct nlattr *nest_parms;
93
94 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
95 if (!nest_parms)
96 goto nla_put_failure;
97
98 if (likely(l3proto->tuple_to_nlattr))
99 ret = l3proto->tuple_to_nlattr(skb, tuple);
100
101 nla_nest_end(skb, nest_parms);
102
103 return ret;
104
105 nla_put_failure:
106 return -1;
107 }
108
109 static int
110 ctnetlink_dump_tuples(struct sk_buff *skb,
111 const struct nf_conntrack_tuple *tuple)
112 {
113 int ret;
114 struct nf_conntrack_l3proto *l3proto;
115 struct nf_conntrack_l4proto *l4proto;
116
117 rcu_read_lock();
118 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
119 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
120
121 if (ret >= 0) {
122 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
123 tuple->dst.protonum);
124 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
125 }
126 rcu_read_unlock();
127 return ret;
128 }
129
130 static inline int
131 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
132 {
133 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
134 goto nla_put_failure;
135 return 0;
136
137 nla_put_failure:
138 return -1;
139 }
140
141 static inline int
142 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
143 {
144 long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
145
146 if (timeout < 0)
147 timeout = 0;
148
149 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
150 goto nla_put_failure;
151 return 0;
152
153 nla_put_failure:
154 return -1;
155 }
156
157 static inline int
158 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
159 {
160 struct nf_conntrack_l4proto *l4proto;
161 struct nlattr *nest_proto;
162 int ret;
163
164 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
165 if (!l4proto->to_nlattr)
166 return 0;
167
168 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
169 if (!nest_proto)
170 goto nla_put_failure;
171
172 ret = l4proto->to_nlattr(skb, nest_proto, ct);
173
174 nla_nest_end(skb, nest_proto);
175
176 return ret;
177
178 nla_put_failure:
179 return -1;
180 }
181
182 static inline int
183 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
184 {
185 struct nlattr *nest_helper;
186 const struct nf_conn_help *help = nfct_help(ct);
187 struct nf_conntrack_helper *helper;
188
189 if (!help)
190 return 0;
191
192 helper = rcu_dereference(help->helper);
193 if (!helper)
194 goto out;
195
196 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
197 if (!nest_helper)
198 goto nla_put_failure;
199 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
200 goto nla_put_failure;
201
202 if (helper->to_nlattr)
203 helper->to_nlattr(skb, ct);
204
205 nla_nest_end(skb, nest_helper);
206 out:
207 return 0;
208
209 nla_put_failure:
210 return -1;
211 }
212
213 static int
214 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
215 enum ip_conntrack_dir dir, int type)
216 {
217 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
218 struct nf_conn_counter *counter = acct->counter;
219 struct nlattr *nest_count;
220 u64 pkts, bytes;
221
222 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
223 pkts = atomic64_xchg(&counter[dir].packets, 0);
224 bytes = atomic64_xchg(&counter[dir].bytes, 0);
225 } else {
226 pkts = atomic64_read(&counter[dir].packets);
227 bytes = atomic64_read(&counter[dir].bytes);
228 }
229
230 nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
231 if (!nest_count)
232 goto nla_put_failure;
233
234 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts)) ||
235 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes)))
236 goto nla_put_failure;
237
238 nla_nest_end(skb, nest_count);
239
240 return 0;
241
242 nla_put_failure:
243 return -1;
244 }
245
246 static int
247 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
248 {
249 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
250
251 if (!acct)
252 return 0;
253
254 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
255 return -1;
256 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
257 return -1;
258
259 return 0;
260 }
261
262 static int
263 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
264 {
265 struct nlattr *nest_count;
266 const struct nf_conn_tstamp *tstamp;
267
268 tstamp = nf_conn_tstamp_find(ct);
269 if (!tstamp)
270 return 0;
271
272 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
273 if (!nest_count)
274 goto nla_put_failure;
275
276 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start)) ||
277 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
278 cpu_to_be64(tstamp->stop))))
279 goto nla_put_failure;
280 nla_nest_end(skb, nest_count);
281
282 return 0;
283
284 nla_put_failure:
285 return -1;
286 }
287
288 #ifdef CONFIG_NF_CONNTRACK_MARK
289 static inline int
290 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
291 {
292 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
293 goto nla_put_failure;
294 return 0;
295
296 nla_put_failure:
297 return -1;
298 }
299 #else
300 #define ctnetlink_dump_mark(a, b) (0)
301 #endif
302
303 #ifdef CONFIG_NF_CONNTRACK_SECMARK
304 static inline int
305 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
306 {
307 struct nlattr *nest_secctx;
308 int len, ret;
309 char *secctx;
310
311 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
312 if (ret)
313 return 0;
314
315 ret = -1;
316 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
317 if (!nest_secctx)
318 goto nla_put_failure;
319
320 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
321 goto nla_put_failure;
322 nla_nest_end(skb, nest_secctx);
323
324 ret = 0;
325 nla_put_failure:
326 security_release_secctx(secctx, len);
327 return ret;
328 }
329 #else
330 #define ctnetlink_dump_secctx(a, b) (0)
331 #endif
332
333 #ifdef CONFIG_NF_CONNTRACK_LABELS
334 static int ctnetlink_label_size(const struct nf_conn *ct)
335 {
336 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
337
338 if (!labels)
339 return 0;
340 return nla_total_size(labels->words * sizeof(long));
341 }
342
343 static int
344 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
345 {
346 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
347 unsigned int len, i;
348
349 if (!labels)
350 return 0;
351
352 len = labels->words * sizeof(long);
353 i = 0;
354 do {
355 if (labels->bits[i] != 0)
356 return nla_put(skb, CTA_LABELS, len, labels->bits);
357 i++;
358 } while (i < labels->words);
359
360 return 0;
361 }
362 #else
363 #define ctnetlink_dump_labels(a, b) (0)
364 #define ctnetlink_label_size(a) (0)
365 #endif
366
367 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
368
369 static inline int
370 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
371 {
372 struct nlattr *nest_parms;
373
374 if (!(ct->status & IPS_EXPECTED))
375 return 0;
376
377 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
378 if (!nest_parms)
379 goto nla_put_failure;
380 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
381 goto nla_put_failure;
382 nla_nest_end(skb, nest_parms);
383
384 return 0;
385
386 nla_put_failure:
387 return -1;
388 }
389
390 static int
391 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
392 {
393 struct nlattr *nest_parms;
394
395 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
396 if (!nest_parms)
397 goto nla_put_failure;
398
399 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
400 htonl(seq->correction_pos)) ||
401 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
402 htonl(seq->offset_before)) ||
403 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
404 htonl(seq->offset_after)))
405 goto nla_put_failure;
406
407 nla_nest_end(skb, nest_parms);
408
409 return 0;
410
411 nla_put_failure:
412 return -1;
413 }
414
415 static inline int
416 ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
417 {
418 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
419 struct nf_ct_seqadj *seq;
420
421 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
422 return 0;
423
424 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
425 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
426 return -1;
427
428 seq = &seqadj->seq[IP_CT_DIR_REPLY];
429 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
430 return -1;
431
432 return 0;
433 }
434
435 static inline int
436 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
437 {
438 if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
439 goto nla_put_failure;
440 return 0;
441
442 nla_put_failure:
443 return -1;
444 }
445
446 static inline int
447 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
448 {
449 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
450 goto nla_put_failure;
451 return 0;
452
453 nla_put_failure:
454 return -1;
455 }
456
457 static int
458 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
459 struct nf_conn *ct)
460 {
461 struct nlmsghdr *nlh;
462 struct nfgenmsg *nfmsg;
463 struct nlattr *nest_parms;
464 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
465
466 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
467 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
468 if (nlh == NULL)
469 goto nlmsg_failure;
470
471 nfmsg = nlmsg_data(nlh);
472 nfmsg->nfgen_family = nf_ct_l3num(ct);
473 nfmsg->version = NFNETLINK_V0;
474 nfmsg->res_id = 0;
475
476 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
477 if (!nest_parms)
478 goto nla_put_failure;
479 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
480 goto nla_put_failure;
481 nla_nest_end(skb, nest_parms);
482
483 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
484 if (!nest_parms)
485 goto nla_put_failure;
486 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
487 goto nla_put_failure;
488 nla_nest_end(skb, nest_parms);
489
490 if (nf_ct_zone(ct) &&
491 nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
492 goto nla_put_failure;
493
494 if (ctnetlink_dump_status(skb, ct) < 0 ||
495 ctnetlink_dump_timeout(skb, ct) < 0 ||
496 ctnetlink_dump_acct(skb, ct, type) < 0 ||
497 ctnetlink_dump_timestamp(skb, ct) < 0 ||
498 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
499 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
500 ctnetlink_dump_mark(skb, ct) < 0 ||
501 ctnetlink_dump_secctx(skb, ct) < 0 ||
502 ctnetlink_dump_labels(skb, ct) < 0 ||
503 ctnetlink_dump_id(skb, ct) < 0 ||
504 ctnetlink_dump_use(skb, ct) < 0 ||
505 ctnetlink_dump_master(skb, ct) < 0 ||
506 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
507 goto nla_put_failure;
508
509 nlmsg_end(skb, nlh);
510 return skb->len;
511
512 nlmsg_failure:
513 nla_put_failure:
514 nlmsg_cancel(skb, nlh);
515 return -1;
516 }
517
518 static inline size_t
519 ctnetlink_proto_size(const struct nf_conn *ct)
520 {
521 struct nf_conntrack_l3proto *l3proto;
522 struct nf_conntrack_l4proto *l4proto;
523 size_t len = 0;
524
525 rcu_read_lock();
526 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
527 len += l3proto->nla_size;
528
529 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
530 len += l4proto->nla_size;
531 rcu_read_unlock();
532
533 return len;
534 }
535
536 static inline size_t
537 ctnetlink_acct_size(const struct nf_conn *ct)
538 {
539 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
540 return 0;
541 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
542 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
543 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
544 ;
545 }
546
547 static inline int
548 ctnetlink_secctx_size(const struct nf_conn *ct)
549 {
550 #ifdef CONFIG_NF_CONNTRACK_SECMARK
551 int len, ret;
552
553 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
554 if (ret)
555 return 0;
556
557 return nla_total_size(0) /* CTA_SECCTX */
558 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
559 #else
560 return 0;
561 #endif
562 }
563
564 static inline size_t
565 ctnetlink_timestamp_size(const struct nf_conn *ct)
566 {
567 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
568 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
569 return 0;
570 return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
571 #else
572 return 0;
573 #endif
574 }
575
576 static inline size_t
577 ctnetlink_nlmsg_size(const struct nf_conn *ct)
578 {
579 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
580 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
581 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
582 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
583 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
584 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
585 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
586 + ctnetlink_acct_size(ct)
587 + ctnetlink_timestamp_size(ct)
588 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
589 + nla_total_size(0) /* CTA_PROTOINFO */
590 + nla_total_size(0) /* CTA_HELP */
591 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
592 + ctnetlink_secctx_size(ct)
593 #ifdef CONFIG_NF_NAT_NEEDED
594 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
595 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
596 #endif
597 #ifdef CONFIG_NF_CONNTRACK_MARK
598 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
599 #endif
600 + ctnetlink_proto_size(ct)
601 + ctnetlink_label_size(ct)
602 ;
603 }
604
605 #ifdef CONFIG_NF_CONNTRACK_EVENTS
606 static int
607 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
608 {
609 struct net *net;
610 struct nlmsghdr *nlh;
611 struct nfgenmsg *nfmsg;
612 struct nlattr *nest_parms;
613 struct nf_conn *ct = item->ct;
614 struct sk_buff *skb;
615 unsigned int type;
616 unsigned int flags = 0, group;
617 int err;
618
619 /* ignore our fake conntrack entry */
620 if (nf_ct_is_untracked(ct))
621 return 0;
622
623 if (events & (1 << IPCT_DESTROY)) {
624 type = IPCTNL_MSG_CT_DELETE;
625 group = NFNLGRP_CONNTRACK_DESTROY;
626 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
627 type = IPCTNL_MSG_CT_NEW;
628 flags = NLM_F_CREATE|NLM_F_EXCL;
629 group = NFNLGRP_CONNTRACK_NEW;
630 } else if (events) {
631 type = IPCTNL_MSG_CT_NEW;
632 group = NFNLGRP_CONNTRACK_UPDATE;
633 } else
634 return 0;
635
636 net = nf_ct_net(ct);
637 if (!item->report && !nfnetlink_has_listeners(net, group))
638 return 0;
639
640 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
641 if (skb == NULL)
642 goto errout;
643
644 type |= NFNL_SUBSYS_CTNETLINK << 8;
645 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
646 if (nlh == NULL)
647 goto nlmsg_failure;
648
649 nfmsg = nlmsg_data(nlh);
650 nfmsg->nfgen_family = nf_ct_l3num(ct);
651 nfmsg->version = NFNETLINK_V0;
652 nfmsg->res_id = 0;
653
654 rcu_read_lock();
655 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
656 if (!nest_parms)
657 goto nla_put_failure;
658 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
659 goto nla_put_failure;
660 nla_nest_end(skb, nest_parms);
661
662 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
663 if (!nest_parms)
664 goto nla_put_failure;
665 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
666 goto nla_put_failure;
667 nla_nest_end(skb, nest_parms);
668
669 if (nf_ct_zone(ct) &&
670 nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
671 goto nla_put_failure;
672
673 if (ctnetlink_dump_id(skb, ct) < 0)
674 goto nla_put_failure;
675
676 if (ctnetlink_dump_status(skb, ct) < 0)
677 goto nla_put_failure;
678
679 if (events & (1 << IPCT_DESTROY)) {
680 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
681 ctnetlink_dump_timestamp(skb, ct) < 0)
682 goto nla_put_failure;
683 } else {
684 if (ctnetlink_dump_timeout(skb, ct) < 0)
685 goto nla_put_failure;
686
687 if (events & (1 << IPCT_PROTOINFO)
688 && ctnetlink_dump_protoinfo(skb, ct) < 0)
689 goto nla_put_failure;
690
691 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
692 && ctnetlink_dump_helpinfo(skb, ct) < 0)
693 goto nla_put_failure;
694
695 #ifdef CONFIG_NF_CONNTRACK_SECMARK
696 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
697 && ctnetlink_dump_secctx(skb, ct) < 0)
698 goto nla_put_failure;
699 #endif
700 if (events & (1 << IPCT_LABEL) &&
701 ctnetlink_dump_labels(skb, ct) < 0)
702 goto nla_put_failure;
703
704 if (events & (1 << IPCT_RELATED) &&
705 ctnetlink_dump_master(skb, ct) < 0)
706 goto nla_put_failure;
707
708 if (events & (1 << IPCT_SEQADJ) &&
709 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
710 goto nla_put_failure;
711 }
712
713 #ifdef CONFIG_NF_CONNTRACK_MARK
714 if ((events & (1 << IPCT_MARK) || ct->mark)
715 && ctnetlink_dump_mark(skb, ct) < 0)
716 goto nla_put_failure;
717 #endif
718 rcu_read_unlock();
719
720 nlmsg_end(skb, nlh);
721 err = nfnetlink_send(skb, net, item->portid, group, item->report,
722 GFP_ATOMIC);
723 if (err == -ENOBUFS || err == -EAGAIN)
724 return -ENOBUFS;
725
726 return 0;
727
728 nla_put_failure:
729 rcu_read_unlock();
730 nlmsg_cancel(skb, nlh);
731 nlmsg_failure:
732 kfree_skb(skb);
733 errout:
734 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
735 return -ENOBUFS;
736
737 return 0;
738 }
739 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
740
741 static int ctnetlink_done(struct netlink_callback *cb)
742 {
743 if (cb->args[1])
744 nf_ct_put((struct nf_conn *)cb->args[1]);
745 if (cb->data)
746 kfree(cb->data);
747 return 0;
748 }
749
750 struct ctnetlink_dump_filter {
751 struct {
752 u_int32_t val;
753 u_int32_t mask;
754 } mark;
755 };
756
757 static int
758 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
759 {
760 struct net *net = sock_net(skb->sk);
761 struct nf_conn *ct, *last;
762 struct nf_conntrack_tuple_hash *h;
763 struct hlist_nulls_node *n;
764 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
765 u_int8_t l3proto = nfmsg->nfgen_family;
766 int res;
767 spinlock_t *lockp;
768
769 #ifdef CONFIG_NF_CONNTRACK_MARK
770 const struct ctnetlink_dump_filter *filter = cb->data;
771 #endif
772
773 last = (struct nf_conn *)cb->args[1];
774
775 local_bh_disable();
776 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
777 restart:
778 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
779 spin_lock(lockp);
780 if (cb->args[0] >= net->ct.htable_size) {
781 spin_unlock(lockp);
782 goto out;
783 }
784 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
785 hnnode) {
786 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
787 continue;
788 ct = nf_ct_tuplehash_to_ctrack(h);
789 /* Dump entries of a given L3 protocol number.
790 * If it is not specified, ie. l3proto == 0,
791 * then dump everything. */
792 if (l3proto && nf_ct_l3num(ct) != l3proto)
793 continue;
794 if (cb->args[1]) {
795 if (ct != last)
796 continue;
797 cb->args[1] = 0;
798 }
799 #ifdef CONFIG_NF_CONNTRACK_MARK
800 if (filter && !((ct->mark & filter->mark.mask) ==
801 filter->mark.val)) {
802 continue;
803 }
804 #endif
805 rcu_read_lock();
806 res =
807 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
808 cb->nlh->nlmsg_seq,
809 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
810 ct);
811 rcu_read_unlock();
812 if (res < 0) {
813 nf_conntrack_get(&ct->ct_general);
814 cb->args[1] = (unsigned long)ct;
815 spin_unlock(lockp);
816 goto out;
817 }
818 }
819 spin_unlock(lockp);
820 if (cb->args[1]) {
821 cb->args[1] = 0;
822 goto restart;
823 }
824 }
825 out:
826 local_bh_enable();
827 if (last)
828 nf_ct_put(last);
829
830 return skb->len;
831 }
832
833 static inline int
834 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
835 {
836 struct nlattr *tb[CTA_IP_MAX+1];
837 struct nf_conntrack_l3proto *l3proto;
838 int ret = 0;
839
840 ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
841 if (ret < 0)
842 return ret;
843
844 rcu_read_lock();
845 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
846
847 if (likely(l3proto->nlattr_to_tuple)) {
848 ret = nla_validate_nested(attr, CTA_IP_MAX,
849 l3proto->nla_policy);
850 if (ret == 0)
851 ret = l3proto->nlattr_to_tuple(tb, tuple);
852 }
853
854 rcu_read_unlock();
855
856 return ret;
857 }
858
859 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
860 [CTA_PROTO_NUM] = { .type = NLA_U8 },
861 };
862
863 static inline int
864 ctnetlink_parse_tuple_proto(struct nlattr *attr,
865 struct nf_conntrack_tuple *tuple)
866 {
867 struct nlattr *tb[CTA_PROTO_MAX+1];
868 struct nf_conntrack_l4proto *l4proto;
869 int ret = 0;
870
871 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
872 if (ret < 0)
873 return ret;
874
875 if (!tb[CTA_PROTO_NUM])
876 return -EINVAL;
877 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
878
879 rcu_read_lock();
880 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
881
882 if (likely(l4proto->nlattr_to_tuple)) {
883 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
884 l4proto->nla_policy);
885 if (ret == 0)
886 ret = l4proto->nlattr_to_tuple(tb, tuple);
887 }
888
889 rcu_read_unlock();
890
891 return ret;
892 }
893
894 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
895 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
896 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
897 };
898
899 static int
900 ctnetlink_parse_tuple(const struct nlattr * const cda[],
901 struct nf_conntrack_tuple *tuple,
902 enum ctattr_type type, u_int8_t l3num)
903 {
904 struct nlattr *tb[CTA_TUPLE_MAX+1];
905 int err;
906
907 memset(tuple, 0, sizeof(*tuple));
908
909 err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
910 if (err < 0)
911 return err;
912
913 if (!tb[CTA_TUPLE_IP])
914 return -EINVAL;
915
916 tuple->src.l3num = l3num;
917
918 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
919 if (err < 0)
920 return err;
921
922 if (!tb[CTA_TUPLE_PROTO])
923 return -EINVAL;
924
925 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
926 if (err < 0)
927 return err;
928
929 /* orig and expect tuples get DIR_ORIGINAL */
930 if (type == CTA_TUPLE_REPLY)
931 tuple->dst.dir = IP_CT_DIR_REPLY;
932 else
933 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
934
935 return 0;
936 }
937
938 static int
939 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
940 {
941 if (attr)
942 #ifdef CONFIG_NF_CONNTRACK_ZONES
943 *zone = ntohs(nla_get_be16(attr));
944 #else
945 return -EOPNOTSUPP;
946 #endif
947 else
948 *zone = 0;
949
950 return 0;
951 }
952
953 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
954 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
955 .len = NF_CT_HELPER_NAME_LEN - 1 },
956 };
957
958 static inline int
959 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
960 struct nlattr **helpinfo)
961 {
962 int err;
963 struct nlattr *tb[CTA_HELP_MAX+1];
964
965 err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
966 if (err < 0)
967 return err;
968
969 if (!tb[CTA_HELP_NAME])
970 return -EINVAL;
971
972 *helper_name = nla_data(tb[CTA_HELP_NAME]);
973
974 if (tb[CTA_HELP_INFO])
975 *helpinfo = tb[CTA_HELP_INFO];
976
977 return 0;
978 }
979
980 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
981 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
982 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
983 [CTA_STATUS] = { .type = NLA_U32 },
984 [CTA_PROTOINFO] = { .type = NLA_NESTED },
985 [CTA_HELP] = { .type = NLA_NESTED },
986 [CTA_NAT_SRC] = { .type = NLA_NESTED },
987 [CTA_TIMEOUT] = { .type = NLA_U32 },
988 [CTA_MARK] = { .type = NLA_U32 },
989 [CTA_ID] = { .type = NLA_U32 },
990 [CTA_NAT_DST] = { .type = NLA_NESTED },
991 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
992 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
993 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
994 [CTA_ZONE] = { .type = NLA_U16 },
995 [CTA_MARK_MASK] = { .type = NLA_U32 },
996 [CTA_LABELS] = { .type = NLA_BINARY,
997 .len = NF_CT_LABELS_MAX_SIZE },
998 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
999 .len = NF_CT_LABELS_MAX_SIZE },
1000 };
1001
1002 static int
1003 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
1004 const struct nlmsghdr *nlh,
1005 const struct nlattr * const cda[])
1006 {
1007 struct net *net = sock_net(ctnl);
1008 struct nf_conntrack_tuple_hash *h;
1009 struct nf_conntrack_tuple tuple;
1010 struct nf_conn *ct;
1011 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1012 u_int8_t u3 = nfmsg->nfgen_family;
1013 u16 zone;
1014 int err;
1015
1016 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1017 if (err < 0)
1018 return err;
1019
1020 if (cda[CTA_TUPLE_ORIG])
1021 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1022 else if (cda[CTA_TUPLE_REPLY])
1023 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1024 else {
1025 /* Flush the whole table */
1026 nf_conntrack_flush_report(net,
1027 NETLINK_CB(skb).portid,
1028 nlmsg_report(nlh));
1029 return 0;
1030 }
1031
1032 if (err < 0)
1033 return err;
1034
1035 h = nf_conntrack_find_get(net, zone, &tuple);
1036 if (!h)
1037 return -ENOENT;
1038
1039 ct = nf_ct_tuplehash_to_ctrack(h);
1040
1041 if (cda[CTA_ID]) {
1042 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1043 if (id != (u32)(unsigned long)ct) {
1044 nf_ct_put(ct);
1045 return -ENOENT;
1046 }
1047 }
1048
1049 if (del_timer(&ct->timeout))
1050 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1051
1052 nf_ct_put(ct);
1053
1054 return 0;
1055 }
1056
1057 static int
1058 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
1059 const struct nlmsghdr *nlh,
1060 const struct nlattr * const cda[])
1061 {
1062 struct net *net = sock_net(ctnl);
1063 struct nf_conntrack_tuple_hash *h;
1064 struct nf_conntrack_tuple tuple;
1065 struct nf_conn *ct;
1066 struct sk_buff *skb2 = NULL;
1067 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1068 u_int8_t u3 = nfmsg->nfgen_family;
1069 u16 zone;
1070 int err;
1071
1072 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1073 struct netlink_dump_control c = {
1074 .dump = ctnetlink_dump_table,
1075 .done = ctnetlink_done,
1076 };
1077 #ifdef CONFIG_NF_CONNTRACK_MARK
1078 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1079 struct ctnetlink_dump_filter *filter;
1080
1081 filter = kzalloc(sizeof(struct ctnetlink_dump_filter),
1082 GFP_ATOMIC);
1083 if (filter == NULL)
1084 return -ENOMEM;
1085
1086 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
1087 filter->mark.mask =
1088 ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1089 c.data = filter;
1090 }
1091 #endif
1092 return netlink_dump_start(ctnl, skb, nlh, &c);
1093 }
1094
1095 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1096 if (err < 0)
1097 return err;
1098
1099 if (cda[CTA_TUPLE_ORIG])
1100 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1101 else if (cda[CTA_TUPLE_REPLY])
1102 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1103 else
1104 return -EINVAL;
1105
1106 if (err < 0)
1107 return err;
1108
1109 h = nf_conntrack_find_get(net, zone, &tuple);
1110 if (!h)
1111 return -ENOENT;
1112
1113 ct = nf_ct_tuplehash_to_ctrack(h);
1114
1115 err = -ENOMEM;
1116 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1117 if (skb2 == NULL) {
1118 nf_ct_put(ct);
1119 return -ENOMEM;
1120 }
1121
1122 rcu_read_lock();
1123 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1124 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1125 rcu_read_unlock();
1126 nf_ct_put(ct);
1127 if (err <= 0)
1128 goto free;
1129
1130 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1131 if (err < 0)
1132 goto out;
1133
1134 return 0;
1135
1136 free:
1137 kfree_skb(skb2);
1138 out:
1139 /* this avoids a loop in nfnetlink. */
1140 return err == -EAGAIN ? -ENOBUFS : err;
1141 }
1142
1143 static int ctnetlink_done_list(struct netlink_callback *cb)
1144 {
1145 if (cb->args[1])
1146 nf_ct_put((struct nf_conn *)cb->args[1]);
1147 return 0;
1148 }
1149
1150 static int
1151 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1152 {
1153 struct nf_conn *ct, *last;
1154 struct nf_conntrack_tuple_hash *h;
1155 struct hlist_nulls_node *n;
1156 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1157 u_int8_t l3proto = nfmsg->nfgen_family;
1158 int res;
1159 int cpu;
1160 struct hlist_nulls_head *list;
1161 struct net *net = sock_net(skb->sk);
1162
1163 if (cb->args[2])
1164 return 0;
1165
1166 last = (struct nf_conn *)cb->args[1];
1167
1168 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1169 struct ct_pcpu *pcpu;
1170
1171 if (!cpu_possible(cpu))
1172 continue;
1173
1174 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1175 spin_lock_bh(&pcpu->lock);
1176 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1177 restart:
1178 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1179 ct = nf_ct_tuplehash_to_ctrack(h);
1180 if (l3proto && nf_ct_l3num(ct) != l3proto)
1181 continue;
1182 if (cb->args[1]) {
1183 if (ct != last)
1184 continue;
1185 cb->args[1] = 0;
1186 }
1187 rcu_read_lock();
1188 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1189 cb->nlh->nlmsg_seq,
1190 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1191 ct);
1192 rcu_read_unlock();
1193 if (res < 0) {
1194 if (!atomic_inc_not_zero(&ct->ct_general.use))
1195 continue;
1196 cb->args[0] = cpu;
1197 cb->args[1] = (unsigned long)ct;
1198 spin_unlock_bh(&pcpu->lock);
1199 goto out;
1200 }
1201 }
1202 if (cb->args[1]) {
1203 cb->args[1] = 0;
1204 goto restart;
1205 }
1206 spin_unlock_bh(&pcpu->lock);
1207 }
1208 cb->args[2] = 1;
1209 out:
1210 if (last)
1211 nf_ct_put(last);
1212
1213 return skb->len;
1214 }
1215
1216 static int
1217 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1218 {
1219 return ctnetlink_dump_list(skb, cb, true);
1220 }
1221
1222 static int
1223 ctnetlink_get_ct_dying(struct sock *ctnl, struct sk_buff *skb,
1224 const struct nlmsghdr *nlh,
1225 const struct nlattr * const cda[])
1226 {
1227 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1228 struct netlink_dump_control c = {
1229 .dump = ctnetlink_dump_dying,
1230 .done = ctnetlink_done_list,
1231 };
1232 return netlink_dump_start(ctnl, skb, nlh, &c);
1233 }
1234
1235 return -EOPNOTSUPP;
1236 }
1237
1238 static int
1239 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1240 {
1241 return ctnetlink_dump_list(skb, cb, false);
1242 }
1243
1244 static int
1245 ctnetlink_get_ct_unconfirmed(struct sock *ctnl, struct sk_buff *skb,
1246 const struct nlmsghdr *nlh,
1247 const struct nlattr * const cda[])
1248 {
1249 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1250 struct netlink_dump_control c = {
1251 .dump = ctnetlink_dump_unconfirmed,
1252 .done = ctnetlink_done_list,
1253 };
1254 return netlink_dump_start(ctnl, skb, nlh, &c);
1255 }
1256
1257 return -EOPNOTSUPP;
1258 }
1259
1260 #ifdef CONFIG_NF_NAT_NEEDED
1261 static int
1262 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1263 enum nf_nat_manip_type manip,
1264 const struct nlattr *attr)
1265 {
1266 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1267 int err;
1268
1269 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1270 if (!parse_nat_setup) {
1271 #ifdef CONFIG_MODULES
1272 rcu_read_unlock();
1273 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1274 if (request_module("nf-nat") < 0) {
1275 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1276 rcu_read_lock();
1277 return -EOPNOTSUPP;
1278 }
1279 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1280 rcu_read_lock();
1281 if (nfnetlink_parse_nat_setup_hook)
1282 return -EAGAIN;
1283 #endif
1284 return -EOPNOTSUPP;
1285 }
1286
1287 err = parse_nat_setup(ct, manip, attr);
1288 if (err == -EAGAIN) {
1289 #ifdef CONFIG_MODULES
1290 rcu_read_unlock();
1291 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1292 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1293 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1294 rcu_read_lock();
1295 return -EOPNOTSUPP;
1296 }
1297 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1298 rcu_read_lock();
1299 #else
1300 err = -EOPNOTSUPP;
1301 #endif
1302 }
1303 return err;
1304 }
1305 #endif
1306
1307 static int
1308 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1309 {
1310 unsigned long d;
1311 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1312 d = ct->status ^ status;
1313
1314 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1315 /* unchangeable */
1316 return -EBUSY;
1317
1318 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1319 /* SEEN_REPLY bit can only be set */
1320 return -EBUSY;
1321
1322 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1323 /* ASSURED bit can only be set */
1324 return -EBUSY;
1325
1326 /* Be careful here, modifying NAT bits can screw up things,
1327 * so don't let users modify them directly if they don't pass
1328 * nf_nat_range. */
1329 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1330 return 0;
1331 }
1332
1333 static int
1334 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1335 {
1336 #ifdef CONFIG_NF_NAT_NEEDED
1337 int ret;
1338
1339 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1340 return 0;
1341
1342 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1343 cda[CTA_NAT_DST]);
1344 if (ret < 0)
1345 return ret;
1346
1347 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1348 cda[CTA_NAT_SRC]);
1349 return ret;
1350 #else
1351 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1352 return 0;
1353 return -EOPNOTSUPP;
1354 #endif
1355 }
1356
1357 static inline int
1358 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1359 {
1360 struct nf_conntrack_helper *helper;
1361 struct nf_conn_help *help = nfct_help(ct);
1362 char *helpname = NULL;
1363 struct nlattr *helpinfo = NULL;
1364 int err;
1365
1366 /* don't change helper of sibling connections */
1367 if (ct->master)
1368 return -EBUSY;
1369
1370 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1371 if (err < 0)
1372 return err;
1373
1374 if (!strcmp(helpname, "")) {
1375 if (help && help->helper) {
1376 /* we had a helper before ... */
1377 nf_ct_remove_expectations(ct);
1378 RCU_INIT_POINTER(help->helper, NULL);
1379 }
1380
1381 return 0;
1382 }
1383
1384 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1385 nf_ct_protonum(ct));
1386 if (helper == NULL) {
1387 #ifdef CONFIG_MODULES
1388 spin_unlock_bh(&nf_conntrack_expect_lock);
1389
1390 if (request_module("nfct-helper-%s", helpname) < 0) {
1391 spin_lock_bh(&nf_conntrack_expect_lock);
1392 return -EOPNOTSUPP;
1393 }
1394
1395 spin_lock_bh(&nf_conntrack_expect_lock);
1396 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1397 nf_ct_protonum(ct));
1398 if (helper)
1399 return -EAGAIN;
1400 #endif
1401 return -EOPNOTSUPP;
1402 }
1403
1404 if (help) {
1405 if (help->helper == helper) {
1406 /* update private helper data if allowed. */
1407 if (helper->from_nlattr)
1408 helper->from_nlattr(helpinfo, ct);
1409 return 0;
1410 } else
1411 return -EBUSY;
1412 }
1413
1414 /* we cannot set a helper for an existing conntrack */
1415 return -EOPNOTSUPP;
1416 }
1417
1418 static inline int
1419 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1420 {
1421 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1422
1423 if (!del_timer(&ct->timeout))
1424 return -ETIME;
1425
1426 ct->timeout.expires = jiffies + timeout * HZ;
1427 add_timer(&ct->timeout);
1428
1429 return 0;
1430 }
1431
1432 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1433 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1434 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1435 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1436 };
1437
1438 static inline int
1439 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1440 {
1441 const struct nlattr *attr = cda[CTA_PROTOINFO];
1442 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1443 struct nf_conntrack_l4proto *l4proto;
1444 int err = 0;
1445
1446 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1447 if (err < 0)
1448 return err;
1449
1450 rcu_read_lock();
1451 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1452 if (l4proto->from_nlattr)
1453 err = l4proto->from_nlattr(tb, ct);
1454 rcu_read_unlock();
1455
1456 return err;
1457 }
1458
1459 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1460 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1461 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1462 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1463 };
1464
1465 static inline int
1466 change_seq_adj(struct nf_ct_seqadj *seq, const struct nlattr * const attr)
1467 {
1468 int err;
1469 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1470
1471 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1472 if (err < 0)
1473 return err;
1474
1475 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1476 return -EINVAL;
1477
1478 seq->correction_pos =
1479 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1480
1481 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1482 return -EINVAL;
1483
1484 seq->offset_before =
1485 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1486
1487 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1488 return -EINVAL;
1489
1490 seq->offset_after =
1491 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1492
1493 return 0;
1494 }
1495
1496 static int
1497 ctnetlink_change_seq_adj(struct nf_conn *ct,
1498 const struct nlattr * const cda[])
1499 {
1500 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1501 int ret = 0;
1502
1503 if (!seqadj)
1504 return 0;
1505
1506 if (cda[CTA_SEQ_ADJ_ORIG]) {
1507 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1508 cda[CTA_SEQ_ADJ_ORIG]);
1509 if (ret < 0)
1510 return ret;
1511
1512 ct->status |= IPS_SEQ_ADJUST;
1513 }
1514
1515 if (cda[CTA_SEQ_ADJ_REPLY]) {
1516 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1517 cda[CTA_SEQ_ADJ_REPLY]);
1518 if (ret < 0)
1519 return ret;
1520
1521 ct->status |= IPS_SEQ_ADJUST;
1522 }
1523
1524 return 0;
1525 }
1526
1527 static int
1528 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1529 {
1530 #ifdef CONFIG_NF_CONNTRACK_LABELS
1531 size_t len = nla_len(cda[CTA_LABELS]);
1532 const void *mask = cda[CTA_LABELS_MASK];
1533
1534 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1535 return -EINVAL;
1536
1537 if (mask) {
1538 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1539 nla_len(cda[CTA_LABELS_MASK]) != len)
1540 return -EINVAL;
1541 mask = nla_data(cda[CTA_LABELS_MASK]);
1542 }
1543
1544 len /= sizeof(u32);
1545
1546 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1547 #else
1548 return -EOPNOTSUPP;
1549 #endif
1550 }
1551
1552 static int
1553 ctnetlink_change_conntrack(struct nf_conn *ct,
1554 const struct nlattr * const cda[])
1555 {
1556 int err;
1557
1558 /* only allow NAT changes and master assignation for new conntracks */
1559 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1560 return -EOPNOTSUPP;
1561
1562 if (cda[CTA_HELP]) {
1563 err = ctnetlink_change_helper(ct, cda);
1564 if (err < 0)
1565 return err;
1566 }
1567
1568 if (cda[CTA_TIMEOUT]) {
1569 err = ctnetlink_change_timeout(ct, cda);
1570 if (err < 0)
1571 return err;
1572 }
1573
1574 if (cda[CTA_STATUS]) {
1575 err = ctnetlink_change_status(ct, cda);
1576 if (err < 0)
1577 return err;
1578 }
1579
1580 if (cda[CTA_PROTOINFO]) {
1581 err = ctnetlink_change_protoinfo(ct, cda);
1582 if (err < 0)
1583 return err;
1584 }
1585
1586 #if defined(CONFIG_NF_CONNTRACK_MARK)
1587 if (cda[CTA_MARK])
1588 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1589 #endif
1590
1591 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1592 err = ctnetlink_change_seq_adj(ct, cda);
1593 if (err < 0)
1594 return err;
1595 }
1596
1597 if (cda[CTA_LABELS]) {
1598 err = ctnetlink_attach_labels(ct, cda);
1599 if (err < 0)
1600 return err;
1601 }
1602
1603 return 0;
1604 }
1605
1606 static struct nf_conn *
1607 ctnetlink_create_conntrack(struct net *net, u16 zone,
1608 const struct nlattr * const cda[],
1609 struct nf_conntrack_tuple *otuple,
1610 struct nf_conntrack_tuple *rtuple,
1611 u8 u3)
1612 {
1613 struct nf_conn *ct;
1614 int err = -EINVAL;
1615 struct nf_conntrack_helper *helper;
1616 struct nf_conn_tstamp *tstamp;
1617
1618 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1619 if (IS_ERR(ct))
1620 return ERR_PTR(-ENOMEM);
1621
1622 if (!cda[CTA_TIMEOUT])
1623 goto err1;
1624 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1625
1626 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1627
1628 rcu_read_lock();
1629 if (cda[CTA_HELP]) {
1630 char *helpname = NULL;
1631 struct nlattr *helpinfo = NULL;
1632
1633 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1634 if (err < 0)
1635 goto err2;
1636
1637 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1638 nf_ct_protonum(ct));
1639 if (helper == NULL) {
1640 rcu_read_unlock();
1641 #ifdef CONFIG_MODULES
1642 if (request_module("nfct-helper-%s", helpname) < 0) {
1643 err = -EOPNOTSUPP;
1644 goto err1;
1645 }
1646
1647 rcu_read_lock();
1648 helper = __nf_conntrack_helper_find(helpname,
1649 nf_ct_l3num(ct),
1650 nf_ct_protonum(ct));
1651 if (helper) {
1652 err = -EAGAIN;
1653 goto err2;
1654 }
1655 rcu_read_unlock();
1656 #endif
1657 err = -EOPNOTSUPP;
1658 goto err1;
1659 } else {
1660 struct nf_conn_help *help;
1661
1662 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1663 if (help == NULL) {
1664 err = -ENOMEM;
1665 goto err2;
1666 }
1667 /* set private helper data if allowed. */
1668 if (helper->from_nlattr)
1669 helper->from_nlattr(helpinfo, ct);
1670
1671 /* not in hash table yet so not strictly necessary */
1672 RCU_INIT_POINTER(help->helper, helper);
1673 }
1674 } else {
1675 /* try an implicit helper assignation */
1676 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1677 if (err < 0)
1678 goto err2;
1679 }
1680
1681 err = ctnetlink_setup_nat(ct, cda);
1682 if (err < 0)
1683 goto err2;
1684
1685 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1686 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1687 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1688 nf_ct_labels_ext_add(ct);
1689
1690 /* we must add conntrack extensions before confirmation. */
1691 ct->status |= IPS_CONFIRMED;
1692
1693 if (cda[CTA_STATUS]) {
1694 err = ctnetlink_change_status(ct, cda);
1695 if (err < 0)
1696 goto err2;
1697 }
1698
1699 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1700 err = ctnetlink_change_seq_adj(ct, cda);
1701 if (err < 0)
1702 goto err2;
1703 }
1704
1705 memset(&ct->proto, 0, sizeof(ct->proto));
1706 if (cda[CTA_PROTOINFO]) {
1707 err = ctnetlink_change_protoinfo(ct, cda);
1708 if (err < 0)
1709 goto err2;
1710 }
1711
1712 #if defined(CONFIG_NF_CONNTRACK_MARK)
1713 if (cda[CTA_MARK])
1714 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1715 #endif
1716
1717 /* setup master conntrack: this is a confirmed expectation */
1718 if (cda[CTA_TUPLE_MASTER]) {
1719 struct nf_conntrack_tuple master;
1720 struct nf_conntrack_tuple_hash *master_h;
1721 struct nf_conn *master_ct;
1722
1723 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1724 if (err < 0)
1725 goto err2;
1726
1727 master_h = nf_conntrack_find_get(net, zone, &master);
1728 if (master_h == NULL) {
1729 err = -ENOENT;
1730 goto err2;
1731 }
1732 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1733 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1734 ct->master = master_ct;
1735 }
1736 tstamp = nf_conn_tstamp_find(ct);
1737 if (tstamp)
1738 tstamp->start = ktime_to_ns(ktime_get_real());
1739
1740 err = nf_conntrack_hash_check_insert(ct);
1741 if (err < 0)
1742 goto err2;
1743
1744 rcu_read_unlock();
1745
1746 return ct;
1747
1748 err2:
1749 rcu_read_unlock();
1750 err1:
1751 nf_conntrack_free(ct);
1752 return ERR_PTR(err);
1753 }
1754
1755 static int
1756 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1757 const struct nlmsghdr *nlh,
1758 const struct nlattr * const cda[])
1759 {
1760 struct net *net = sock_net(ctnl);
1761 struct nf_conntrack_tuple otuple, rtuple;
1762 struct nf_conntrack_tuple_hash *h = NULL;
1763 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1764 struct nf_conn *ct;
1765 u_int8_t u3 = nfmsg->nfgen_family;
1766 u16 zone;
1767 int err;
1768
1769 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1770 if (err < 0)
1771 return err;
1772
1773 if (cda[CTA_TUPLE_ORIG]) {
1774 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1775 if (err < 0)
1776 return err;
1777 }
1778
1779 if (cda[CTA_TUPLE_REPLY]) {
1780 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1781 if (err < 0)
1782 return err;
1783 }
1784
1785 if (cda[CTA_TUPLE_ORIG])
1786 h = nf_conntrack_find_get(net, zone, &otuple);
1787 else if (cda[CTA_TUPLE_REPLY])
1788 h = nf_conntrack_find_get(net, zone, &rtuple);
1789
1790 if (h == NULL) {
1791 err = -ENOENT;
1792 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1793 enum ip_conntrack_events events;
1794
1795 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1796 return -EINVAL;
1797
1798 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1799 &rtuple, u3);
1800 if (IS_ERR(ct))
1801 return PTR_ERR(ct);
1802
1803 err = 0;
1804 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1805 events = IPCT_RELATED;
1806 else
1807 events = IPCT_NEW;
1808
1809 if (cda[CTA_LABELS] &&
1810 ctnetlink_attach_labels(ct, cda) == 0)
1811 events |= (1 << IPCT_LABEL);
1812
1813 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1814 (1 << IPCT_ASSURED) |
1815 (1 << IPCT_HELPER) |
1816 (1 << IPCT_PROTOINFO) |
1817 (1 << IPCT_SEQADJ) |
1818 (1 << IPCT_MARK) | events,
1819 ct, NETLINK_CB(skb).portid,
1820 nlmsg_report(nlh));
1821 nf_ct_put(ct);
1822 }
1823
1824 return err;
1825 }
1826 /* implicit 'else' */
1827
1828 err = -EEXIST;
1829 ct = nf_ct_tuplehash_to_ctrack(h);
1830 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1831 spin_lock_bh(&nf_conntrack_expect_lock);
1832 err = ctnetlink_change_conntrack(ct, cda);
1833 spin_unlock_bh(&nf_conntrack_expect_lock);
1834 if (err == 0) {
1835 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1836 (1 << IPCT_ASSURED) |
1837 (1 << IPCT_HELPER) |
1838 (1 << IPCT_LABEL) |
1839 (1 << IPCT_PROTOINFO) |
1840 (1 << IPCT_SEQADJ) |
1841 (1 << IPCT_MARK),
1842 ct, NETLINK_CB(skb).portid,
1843 nlmsg_report(nlh));
1844 }
1845 }
1846
1847 nf_ct_put(ct);
1848 return err;
1849 }
1850
1851 static int
1852 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1853 __u16 cpu, const struct ip_conntrack_stat *st)
1854 {
1855 struct nlmsghdr *nlh;
1856 struct nfgenmsg *nfmsg;
1857 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1858
1859 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1860 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1861 if (nlh == NULL)
1862 goto nlmsg_failure;
1863
1864 nfmsg = nlmsg_data(nlh);
1865 nfmsg->nfgen_family = AF_UNSPEC;
1866 nfmsg->version = NFNETLINK_V0;
1867 nfmsg->res_id = htons(cpu);
1868
1869 if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1870 nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1871 nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
1872 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1873 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1874 nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
1875 nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
1876 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1877 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1878 htonl(st->insert_failed)) ||
1879 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1880 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1881 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1882 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1883 htonl(st->search_restart)))
1884 goto nla_put_failure;
1885
1886 nlmsg_end(skb, nlh);
1887 return skb->len;
1888
1889 nla_put_failure:
1890 nlmsg_failure:
1891 nlmsg_cancel(skb, nlh);
1892 return -1;
1893 }
1894
1895 static int
1896 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
1897 {
1898 int cpu;
1899 struct net *net = sock_net(skb->sk);
1900
1901 if (cb->args[0] == nr_cpu_ids)
1902 return 0;
1903
1904 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1905 const struct ip_conntrack_stat *st;
1906
1907 if (!cpu_possible(cpu))
1908 continue;
1909
1910 st = per_cpu_ptr(net->ct.stat, cpu);
1911 if (ctnetlink_ct_stat_cpu_fill_info(skb,
1912 NETLINK_CB(cb->skb).portid,
1913 cb->nlh->nlmsg_seq,
1914 cpu, st) < 0)
1915 break;
1916 }
1917 cb->args[0] = cpu;
1918
1919 return skb->len;
1920 }
1921
1922 static int
1923 ctnetlink_stat_ct_cpu(struct sock *ctnl, struct sk_buff *skb,
1924 const struct nlmsghdr *nlh,
1925 const struct nlattr * const cda[])
1926 {
1927 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1928 struct netlink_dump_control c = {
1929 .dump = ctnetlink_ct_stat_cpu_dump,
1930 };
1931 return netlink_dump_start(ctnl, skb, nlh, &c);
1932 }
1933
1934 return 0;
1935 }
1936
1937 static int
1938 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
1939 struct net *net)
1940 {
1941 struct nlmsghdr *nlh;
1942 struct nfgenmsg *nfmsg;
1943 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1944 unsigned int nr_conntracks = atomic_read(&net->ct.count);
1945
1946 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
1947 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1948 if (nlh == NULL)
1949 goto nlmsg_failure;
1950
1951 nfmsg = nlmsg_data(nlh);
1952 nfmsg->nfgen_family = AF_UNSPEC;
1953 nfmsg->version = NFNETLINK_V0;
1954 nfmsg->res_id = 0;
1955
1956 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
1957 goto nla_put_failure;
1958
1959 nlmsg_end(skb, nlh);
1960 return skb->len;
1961
1962 nla_put_failure:
1963 nlmsg_failure:
1964 nlmsg_cancel(skb, nlh);
1965 return -1;
1966 }
1967
1968 static int
1969 ctnetlink_stat_ct(struct sock *ctnl, struct sk_buff *skb,
1970 const struct nlmsghdr *nlh,
1971 const struct nlattr * const cda[])
1972 {
1973 struct sk_buff *skb2;
1974 int err;
1975
1976 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1977 if (skb2 == NULL)
1978 return -ENOMEM;
1979
1980 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
1981 nlh->nlmsg_seq,
1982 NFNL_MSG_TYPE(nlh->nlmsg_type),
1983 sock_net(skb->sk));
1984 if (err <= 0)
1985 goto free;
1986
1987 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1988 if (err < 0)
1989 goto out;
1990
1991 return 0;
1992
1993 free:
1994 kfree_skb(skb2);
1995 out:
1996 /* this avoids a loop in nfnetlink. */
1997 return err == -EAGAIN ? -ENOBUFS : err;
1998 }
1999
2000 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2001 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2002 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2003 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2004 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2005 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2006 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2007 .len = NF_CT_HELPER_NAME_LEN - 1 },
2008 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2009 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2010 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2011 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2012 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2013 };
2014
2015 static struct nf_conntrack_expect *
2016 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2017 struct nf_conntrack_helper *helper,
2018 struct nf_conntrack_tuple *tuple,
2019 struct nf_conntrack_tuple *mask);
2020
2021 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
2022 static size_t
2023 ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
2024 {
2025 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2026 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2027 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2028 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2029 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2030 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2031 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2032 + nla_total_size(0) /* CTA_PROTOINFO */
2033 + nla_total_size(0) /* CTA_HELP */
2034 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2035 + ctnetlink_secctx_size(ct)
2036 #ifdef CONFIG_NF_NAT_NEEDED
2037 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2038 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2039 #endif
2040 #ifdef CONFIG_NF_CONNTRACK_MARK
2041 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2042 #endif
2043 + ctnetlink_proto_size(ct)
2044 ;
2045 }
2046
2047 static int
2048 ctnetlink_nfqueue_build(struct sk_buff *skb, struct nf_conn *ct)
2049 {
2050 struct nlattr *nest_parms;
2051
2052 rcu_read_lock();
2053 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2054 if (!nest_parms)
2055 goto nla_put_failure;
2056 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2057 goto nla_put_failure;
2058 nla_nest_end(skb, nest_parms);
2059
2060 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2061 if (!nest_parms)
2062 goto nla_put_failure;
2063 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2064 goto nla_put_failure;
2065 nla_nest_end(skb, nest_parms);
2066
2067 if (nf_ct_zone(ct)) {
2068 if (nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
2069 goto nla_put_failure;
2070 }
2071
2072 if (ctnetlink_dump_id(skb, ct) < 0)
2073 goto nla_put_failure;
2074
2075 if (ctnetlink_dump_status(skb, ct) < 0)
2076 goto nla_put_failure;
2077
2078 if (ctnetlink_dump_timeout(skb, ct) < 0)
2079 goto nla_put_failure;
2080
2081 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2082 goto nla_put_failure;
2083
2084 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2085 goto nla_put_failure;
2086
2087 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2088 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2089 goto nla_put_failure;
2090 #endif
2091 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2092 goto nla_put_failure;
2093
2094 if ((ct->status & IPS_SEQ_ADJUST) &&
2095 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2096 goto nla_put_failure;
2097
2098 #ifdef CONFIG_NF_CONNTRACK_MARK
2099 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2100 goto nla_put_failure;
2101 #endif
2102 if (ctnetlink_dump_labels(skb, ct) < 0)
2103 goto nla_put_failure;
2104 rcu_read_unlock();
2105 return 0;
2106
2107 nla_put_failure:
2108 rcu_read_unlock();
2109 return -ENOSPC;
2110 }
2111
2112 static int
2113 ctnetlink_nfqueue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2114 {
2115 int err;
2116
2117 if (cda[CTA_TIMEOUT]) {
2118 err = ctnetlink_change_timeout(ct, cda);
2119 if (err < 0)
2120 return err;
2121 }
2122 if (cda[CTA_STATUS]) {
2123 err = ctnetlink_change_status(ct, cda);
2124 if (err < 0)
2125 return err;
2126 }
2127 if (cda[CTA_HELP]) {
2128 err = ctnetlink_change_helper(ct, cda);
2129 if (err < 0)
2130 return err;
2131 }
2132 if (cda[CTA_LABELS]) {
2133 err = ctnetlink_attach_labels(ct, cda);
2134 if (err < 0)
2135 return err;
2136 }
2137 #if defined(CONFIG_NF_CONNTRACK_MARK)
2138 if (cda[CTA_MARK]) {
2139 u32 mask = 0, mark, newmark;
2140 if (cda[CTA_MARK_MASK])
2141 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2142
2143 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2144 newmark = (ct->mark & mask) ^ mark;
2145 if (newmark != ct->mark)
2146 ct->mark = newmark;
2147 }
2148 #endif
2149 return 0;
2150 }
2151
2152 static int
2153 ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
2154 {
2155 struct nlattr *cda[CTA_MAX+1];
2156 int ret;
2157
2158 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2159 if (ret < 0)
2160 return ret;
2161
2162 spin_lock_bh(&nf_conntrack_expect_lock);
2163 ret = ctnetlink_nfqueue_parse_ct((const struct nlattr **)cda, ct);
2164 spin_unlock_bh(&nf_conntrack_expect_lock);
2165
2166 return ret;
2167 }
2168
2169 static int ctnetlink_nfqueue_exp_parse(const struct nlattr * const *cda,
2170 const struct nf_conn *ct,
2171 struct nf_conntrack_tuple *tuple,
2172 struct nf_conntrack_tuple *mask)
2173 {
2174 int err;
2175
2176 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2177 nf_ct_l3num(ct));
2178 if (err < 0)
2179 return err;
2180
2181 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2182 nf_ct_l3num(ct));
2183 }
2184
2185 static int
2186 ctnetlink_nfqueue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2187 u32 portid, u32 report)
2188 {
2189 struct nlattr *cda[CTA_EXPECT_MAX+1];
2190 struct nf_conntrack_tuple tuple, mask;
2191 struct nf_conntrack_helper *helper = NULL;
2192 struct nf_conntrack_expect *exp;
2193 int err;
2194
2195 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2196 if (err < 0)
2197 return err;
2198
2199 err = ctnetlink_nfqueue_exp_parse((const struct nlattr * const *)cda,
2200 ct, &tuple, &mask);
2201 if (err < 0)
2202 return err;
2203
2204 if (cda[CTA_EXPECT_HELP_NAME]) {
2205 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2206
2207 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2208 nf_ct_protonum(ct));
2209 if (helper == NULL)
2210 return -EOPNOTSUPP;
2211 }
2212
2213 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2214 helper, &tuple, &mask);
2215 if (IS_ERR(exp))
2216 return PTR_ERR(exp);
2217
2218 err = nf_ct_expect_related_report(exp, portid, report);
2219 if (err < 0) {
2220 nf_ct_expect_put(exp);
2221 return err;
2222 }
2223
2224 return 0;
2225 }
2226
2227 static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
2228 .build_size = ctnetlink_nfqueue_build_size,
2229 .build = ctnetlink_nfqueue_build,
2230 .parse = ctnetlink_nfqueue_parse,
2231 .attach_expect = ctnetlink_nfqueue_attach_expect,
2232 .seq_adjust = nf_ct_tcp_seqadj_set,
2233 };
2234 #endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
2235
2236 /***********************************************************************
2237 * EXPECT
2238 ***********************************************************************/
2239
2240 static inline int
2241 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2242 const struct nf_conntrack_tuple *tuple,
2243 enum ctattr_expect type)
2244 {
2245 struct nlattr *nest_parms;
2246
2247 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2248 if (!nest_parms)
2249 goto nla_put_failure;
2250 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2251 goto nla_put_failure;
2252 nla_nest_end(skb, nest_parms);
2253
2254 return 0;
2255
2256 nla_put_failure:
2257 return -1;
2258 }
2259
2260 static inline int
2261 ctnetlink_exp_dump_mask(struct sk_buff *skb,
2262 const struct nf_conntrack_tuple *tuple,
2263 const struct nf_conntrack_tuple_mask *mask)
2264 {
2265 int ret;
2266 struct nf_conntrack_l3proto *l3proto;
2267 struct nf_conntrack_l4proto *l4proto;
2268 struct nf_conntrack_tuple m;
2269 struct nlattr *nest_parms;
2270
2271 memset(&m, 0xFF, sizeof(m));
2272 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2273 m.src.u.all = mask->src.u.all;
2274 m.dst.protonum = tuple->dst.protonum;
2275
2276 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2277 if (!nest_parms)
2278 goto nla_put_failure;
2279
2280 rcu_read_lock();
2281 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2282 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2283 if (ret >= 0) {
2284 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2285 tuple->dst.protonum);
2286 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2287 }
2288 rcu_read_unlock();
2289
2290 if (unlikely(ret < 0))
2291 goto nla_put_failure;
2292
2293 nla_nest_end(skb, nest_parms);
2294
2295 return 0;
2296
2297 nla_put_failure:
2298 return -1;
2299 }
2300
2301 static const union nf_inet_addr any_addr;
2302
2303 static int
2304 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2305 const struct nf_conntrack_expect *exp)
2306 {
2307 struct nf_conn *master = exp->master;
2308 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2309 struct nf_conn_help *help;
2310 #ifdef CONFIG_NF_NAT_NEEDED
2311 struct nlattr *nest_parms;
2312 struct nf_conntrack_tuple nat_tuple = {};
2313 #endif
2314 struct nf_ct_helper_expectfn *expfn;
2315
2316 if (timeout < 0)
2317 timeout = 0;
2318
2319 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2320 goto nla_put_failure;
2321 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2322 goto nla_put_failure;
2323 if (ctnetlink_exp_dump_tuple(skb,
2324 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2325 CTA_EXPECT_MASTER) < 0)
2326 goto nla_put_failure;
2327
2328 #ifdef CONFIG_NF_NAT_NEEDED
2329 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2330 exp->saved_proto.all) {
2331 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2332 if (!nest_parms)
2333 goto nla_put_failure;
2334
2335 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2336 goto nla_put_failure;
2337
2338 nat_tuple.src.l3num = nf_ct_l3num(master);
2339 nat_tuple.src.u3 = exp->saved_addr;
2340 nat_tuple.dst.protonum = nf_ct_protonum(master);
2341 nat_tuple.src.u = exp->saved_proto;
2342
2343 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2344 CTA_EXPECT_NAT_TUPLE) < 0)
2345 goto nla_put_failure;
2346 nla_nest_end(skb, nest_parms);
2347 }
2348 #endif
2349 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2350 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2351 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2352 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2353 goto nla_put_failure;
2354 help = nfct_help(master);
2355 if (help) {
2356 struct nf_conntrack_helper *helper;
2357
2358 helper = rcu_dereference(help->helper);
2359 if (helper &&
2360 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2361 goto nla_put_failure;
2362 }
2363 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2364 if (expfn != NULL &&
2365 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2366 goto nla_put_failure;
2367
2368 return 0;
2369
2370 nla_put_failure:
2371 return -1;
2372 }
2373
2374 static int
2375 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2376 int event, const struct nf_conntrack_expect *exp)
2377 {
2378 struct nlmsghdr *nlh;
2379 struct nfgenmsg *nfmsg;
2380 unsigned int flags = portid ? NLM_F_MULTI : 0;
2381
2382 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2383 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2384 if (nlh == NULL)
2385 goto nlmsg_failure;
2386
2387 nfmsg = nlmsg_data(nlh);
2388 nfmsg->nfgen_family = exp->tuple.src.l3num;
2389 nfmsg->version = NFNETLINK_V0;
2390 nfmsg->res_id = 0;
2391
2392 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2393 goto nla_put_failure;
2394
2395 nlmsg_end(skb, nlh);
2396 return skb->len;
2397
2398 nlmsg_failure:
2399 nla_put_failure:
2400 nlmsg_cancel(skb, nlh);
2401 return -1;
2402 }
2403
2404 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2405 static int
2406 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2407 {
2408 struct nf_conntrack_expect *exp = item->exp;
2409 struct net *net = nf_ct_exp_net(exp);
2410 struct nlmsghdr *nlh;
2411 struct nfgenmsg *nfmsg;
2412 struct sk_buff *skb;
2413 unsigned int type, group;
2414 int flags = 0;
2415
2416 if (events & (1 << IPEXP_DESTROY)) {
2417 type = IPCTNL_MSG_EXP_DELETE;
2418 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2419 } else if (events & (1 << IPEXP_NEW)) {
2420 type = IPCTNL_MSG_EXP_NEW;
2421 flags = NLM_F_CREATE|NLM_F_EXCL;
2422 group = NFNLGRP_CONNTRACK_EXP_NEW;
2423 } else
2424 return 0;
2425
2426 if (!item->report && !nfnetlink_has_listeners(net, group))
2427 return 0;
2428
2429 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2430 if (skb == NULL)
2431 goto errout;
2432
2433 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2434 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2435 if (nlh == NULL)
2436 goto nlmsg_failure;
2437
2438 nfmsg = nlmsg_data(nlh);
2439 nfmsg->nfgen_family = exp->tuple.src.l3num;
2440 nfmsg->version = NFNETLINK_V0;
2441 nfmsg->res_id = 0;
2442
2443 rcu_read_lock();
2444 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2445 goto nla_put_failure;
2446 rcu_read_unlock();
2447
2448 nlmsg_end(skb, nlh);
2449 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2450 return 0;
2451
2452 nla_put_failure:
2453 rcu_read_unlock();
2454 nlmsg_cancel(skb, nlh);
2455 nlmsg_failure:
2456 kfree_skb(skb);
2457 errout:
2458 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2459 return 0;
2460 }
2461 #endif
2462 static int ctnetlink_exp_done(struct netlink_callback *cb)
2463 {
2464 if (cb->args[1])
2465 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2466 return 0;
2467 }
2468
2469 static int
2470 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2471 {
2472 struct net *net = sock_net(skb->sk);
2473 struct nf_conntrack_expect *exp, *last;
2474 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2475 u_int8_t l3proto = nfmsg->nfgen_family;
2476
2477 rcu_read_lock();
2478 last = (struct nf_conntrack_expect *)cb->args[1];
2479 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2480 restart:
2481 hlist_for_each_entry(exp, &net->ct.expect_hash[cb->args[0]],
2482 hnode) {
2483 if (l3proto && exp->tuple.src.l3num != l3proto)
2484 continue;
2485 if (cb->args[1]) {
2486 if (exp != last)
2487 continue;
2488 cb->args[1] = 0;
2489 }
2490 if (ctnetlink_exp_fill_info(skb,
2491 NETLINK_CB(cb->skb).portid,
2492 cb->nlh->nlmsg_seq,
2493 IPCTNL_MSG_EXP_NEW,
2494 exp) < 0) {
2495 if (!atomic_inc_not_zero(&exp->use))
2496 continue;
2497 cb->args[1] = (unsigned long)exp;
2498 goto out;
2499 }
2500 }
2501 if (cb->args[1]) {
2502 cb->args[1] = 0;
2503 goto restart;
2504 }
2505 }
2506 out:
2507 rcu_read_unlock();
2508 if (last)
2509 nf_ct_expect_put(last);
2510
2511 return skb->len;
2512 }
2513
2514 static int
2515 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2516 {
2517 struct nf_conntrack_expect *exp, *last;
2518 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2519 struct nf_conn *ct = cb->data;
2520 struct nf_conn_help *help = nfct_help(ct);
2521 u_int8_t l3proto = nfmsg->nfgen_family;
2522
2523 if (cb->args[0])
2524 return 0;
2525
2526 rcu_read_lock();
2527 last = (struct nf_conntrack_expect *)cb->args[1];
2528 restart:
2529 hlist_for_each_entry(exp, &help->expectations, lnode) {
2530 if (l3proto && exp->tuple.src.l3num != l3proto)
2531 continue;
2532 if (cb->args[1]) {
2533 if (exp != last)
2534 continue;
2535 cb->args[1] = 0;
2536 }
2537 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2538 cb->nlh->nlmsg_seq,
2539 IPCTNL_MSG_EXP_NEW,
2540 exp) < 0) {
2541 if (!atomic_inc_not_zero(&exp->use))
2542 continue;
2543 cb->args[1] = (unsigned long)exp;
2544 goto out;
2545 }
2546 }
2547 if (cb->args[1]) {
2548 cb->args[1] = 0;
2549 goto restart;
2550 }
2551 cb->args[0] = 1;
2552 out:
2553 rcu_read_unlock();
2554 if (last)
2555 nf_ct_expect_put(last);
2556
2557 return skb->len;
2558 }
2559
2560 static int ctnetlink_dump_exp_ct(struct sock *ctnl, struct sk_buff *skb,
2561 const struct nlmsghdr *nlh,
2562 const struct nlattr * const cda[])
2563 {
2564 int err;
2565 struct net *net = sock_net(ctnl);
2566 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2567 u_int8_t u3 = nfmsg->nfgen_family;
2568 struct nf_conntrack_tuple tuple;
2569 struct nf_conntrack_tuple_hash *h;
2570 struct nf_conn *ct;
2571 u16 zone = 0;
2572 struct netlink_dump_control c = {
2573 .dump = ctnetlink_exp_ct_dump_table,
2574 .done = ctnetlink_exp_done,
2575 };
2576
2577 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2578 if (err < 0)
2579 return err;
2580
2581 if (cda[CTA_EXPECT_ZONE]) {
2582 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2583 if (err < 0)
2584 return err;
2585 }
2586
2587 h = nf_conntrack_find_get(net, zone, &tuple);
2588 if (!h)
2589 return -ENOENT;
2590
2591 ct = nf_ct_tuplehash_to_ctrack(h);
2592 c.data = ct;
2593
2594 err = netlink_dump_start(ctnl, skb, nlh, &c);
2595 nf_ct_put(ct);
2596
2597 return err;
2598 }
2599
2600 static int
2601 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
2602 const struct nlmsghdr *nlh,
2603 const struct nlattr * const cda[])
2604 {
2605 struct net *net = sock_net(ctnl);
2606 struct nf_conntrack_tuple tuple;
2607 struct nf_conntrack_expect *exp;
2608 struct sk_buff *skb2;
2609 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2610 u_int8_t u3 = nfmsg->nfgen_family;
2611 u16 zone;
2612 int err;
2613
2614 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2615 if (cda[CTA_EXPECT_MASTER])
2616 return ctnetlink_dump_exp_ct(ctnl, skb, nlh, cda);
2617 else {
2618 struct netlink_dump_control c = {
2619 .dump = ctnetlink_exp_dump_table,
2620 .done = ctnetlink_exp_done,
2621 };
2622 return netlink_dump_start(ctnl, skb, nlh, &c);
2623 }
2624 }
2625
2626 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2627 if (err < 0)
2628 return err;
2629
2630 if (cda[CTA_EXPECT_TUPLE])
2631 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2632 else if (cda[CTA_EXPECT_MASTER])
2633 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2634 else
2635 return -EINVAL;
2636
2637 if (err < 0)
2638 return err;
2639
2640 exp = nf_ct_expect_find_get(net, zone, &tuple);
2641 if (!exp)
2642 return -ENOENT;
2643
2644 if (cda[CTA_EXPECT_ID]) {
2645 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2646 if (ntohl(id) != (u32)(unsigned long)exp) {
2647 nf_ct_expect_put(exp);
2648 return -ENOENT;
2649 }
2650 }
2651
2652 err = -ENOMEM;
2653 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2654 if (skb2 == NULL) {
2655 nf_ct_expect_put(exp);
2656 goto out;
2657 }
2658
2659 rcu_read_lock();
2660 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2661 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2662 rcu_read_unlock();
2663 nf_ct_expect_put(exp);
2664 if (err <= 0)
2665 goto free;
2666
2667 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2668 if (err < 0)
2669 goto out;
2670
2671 return 0;
2672
2673 free:
2674 kfree_skb(skb2);
2675 out:
2676 /* this avoids a loop in nfnetlink. */
2677 return err == -EAGAIN ? -ENOBUFS : err;
2678 }
2679
2680 static int
2681 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
2682 const struct nlmsghdr *nlh,
2683 const struct nlattr * const cda[])
2684 {
2685 struct net *net = sock_net(ctnl);
2686 struct nf_conntrack_expect *exp;
2687 struct nf_conntrack_tuple tuple;
2688 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2689 struct hlist_node *next;
2690 u_int8_t u3 = nfmsg->nfgen_family;
2691 unsigned int i;
2692 u16 zone;
2693 int err;
2694
2695 if (cda[CTA_EXPECT_TUPLE]) {
2696 /* delete a single expect by tuple */
2697 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2698 if (err < 0)
2699 return err;
2700
2701 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2702 if (err < 0)
2703 return err;
2704
2705 /* bump usage count to 2 */
2706 exp = nf_ct_expect_find_get(net, zone, &tuple);
2707 if (!exp)
2708 return -ENOENT;
2709
2710 if (cda[CTA_EXPECT_ID]) {
2711 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2712 if (ntohl(id) != (u32)(unsigned long)exp) {
2713 nf_ct_expect_put(exp);
2714 return -ENOENT;
2715 }
2716 }
2717
2718 /* after list removal, usage count == 1 */
2719 spin_lock_bh(&nf_conntrack_expect_lock);
2720 if (del_timer(&exp->timeout)) {
2721 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2722 nlmsg_report(nlh));
2723 nf_ct_expect_put(exp);
2724 }
2725 spin_unlock_bh(&nf_conntrack_expect_lock);
2726 /* have to put what we 'get' above.
2727 * after this line usage count == 0 */
2728 nf_ct_expect_put(exp);
2729 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2730 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2731 struct nf_conn_help *m_help;
2732
2733 /* delete all expectations for this helper */
2734 spin_lock_bh(&nf_conntrack_expect_lock);
2735 for (i = 0; i < nf_ct_expect_hsize; i++) {
2736 hlist_for_each_entry_safe(exp, next,
2737 &net->ct.expect_hash[i],
2738 hnode) {
2739 m_help = nfct_help(exp->master);
2740 if (!strcmp(m_help->helper->name, name) &&
2741 del_timer(&exp->timeout)) {
2742 nf_ct_unlink_expect_report(exp,
2743 NETLINK_CB(skb).portid,
2744 nlmsg_report(nlh));
2745 nf_ct_expect_put(exp);
2746 }
2747 }
2748 }
2749 spin_unlock_bh(&nf_conntrack_expect_lock);
2750 } else {
2751 /* This basically means we have to flush everything*/
2752 spin_lock_bh(&nf_conntrack_expect_lock);
2753 for (i = 0; i < nf_ct_expect_hsize; i++) {
2754 hlist_for_each_entry_safe(exp, next,
2755 &net->ct.expect_hash[i],
2756 hnode) {
2757 if (del_timer(&exp->timeout)) {
2758 nf_ct_unlink_expect_report(exp,
2759 NETLINK_CB(skb).portid,
2760 nlmsg_report(nlh));
2761 nf_ct_expect_put(exp);
2762 }
2763 }
2764 }
2765 spin_unlock_bh(&nf_conntrack_expect_lock);
2766 }
2767
2768 return 0;
2769 }
2770 static int
2771 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2772 const struct nlattr * const cda[])
2773 {
2774 if (cda[CTA_EXPECT_TIMEOUT]) {
2775 if (!del_timer(&x->timeout))
2776 return -ETIME;
2777
2778 x->timeout.expires = jiffies +
2779 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2780 add_timer(&x->timeout);
2781 }
2782 return 0;
2783 }
2784
2785 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2786 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2787 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2788 };
2789
2790 static int
2791 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2792 struct nf_conntrack_expect *exp,
2793 u_int8_t u3)
2794 {
2795 #ifdef CONFIG_NF_NAT_NEEDED
2796 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2797 struct nf_conntrack_tuple nat_tuple = {};
2798 int err;
2799
2800 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2801 if (err < 0)
2802 return err;
2803
2804 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2805 return -EINVAL;
2806
2807 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2808 &nat_tuple, CTA_EXPECT_NAT_TUPLE, u3);
2809 if (err < 0)
2810 return err;
2811
2812 exp->saved_addr = nat_tuple.src.u3;
2813 exp->saved_proto = nat_tuple.src.u;
2814 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2815
2816 return 0;
2817 #else
2818 return -EOPNOTSUPP;
2819 #endif
2820 }
2821
2822 static struct nf_conntrack_expect *
2823 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
2824 struct nf_conntrack_helper *helper,
2825 struct nf_conntrack_tuple *tuple,
2826 struct nf_conntrack_tuple *mask)
2827 {
2828 u_int32_t class = 0;
2829 struct nf_conntrack_expect *exp;
2830 struct nf_conn_help *help;
2831 int err;
2832
2833 if (cda[CTA_EXPECT_CLASS] && helper) {
2834 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
2835 if (class > helper->expect_class_max)
2836 return ERR_PTR(-EINVAL);
2837 }
2838 exp = nf_ct_expect_alloc(ct);
2839 if (!exp)
2840 return ERR_PTR(-ENOMEM);
2841
2842 help = nfct_help(ct);
2843 if (!help) {
2844 if (!cda[CTA_EXPECT_TIMEOUT]) {
2845 err = -EINVAL;
2846 goto err_out;
2847 }
2848 exp->timeout.expires =
2849 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2850
2851 exp->flags = NF_CT_EXPECT_USERSPACE;
2852 if (cda[CTA_EXPECT_FLAGS]) {
2853 exp->flags |=
2854 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2855 }
2856 } else {
2857 if (cda[CTA_EXPECT_FLAGS]) {
2858 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2859 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2860 } else
2861 exp->flags = 0;
2862 }
2863 if (cda[CTA_EXPECT_FN]) {
2864 const char *name = nla_data(cda[CTA_EXPECT_FN]);
2865 struct nf_ct_helper_expectfn *expfn;
2866
2867 expfn = nf_ct_helper_expectfn_find_by_name(name);
2868 if (expfn == NULL) {
2869 err = -EINVAL;
2870 goto err_out;
2871 }
2872 exp->expectfn = expfn->expectfn;
2873 } else
2874 exp->expectfn = NULL;
2875
2876 exp->class = class;
2877 exp->master = ct;
2878 exp->helper = helper;
2879 exp->tuple = *tuple;
2880 exp->mask.src.u3 = mask->src.u3;
2881 exp->mask.src.u.all = mask->src.u.all;
2882
2883 if (cda[CTA_EXPECT_NAT]) {
2884 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
2885 exp, nf_ct_l3num(ct));
2886 if (err < 0)
2887 goto err_out;
2888 }
2889 return exp;
2890 err_out:
2891 nf_ct_expect_put(exp);
2892 return ERR_PTR(err);
2893 }
2894
2895 static int
2896 ctnetlink_create_expect(struct net *net, u16 zone,
2897 const struct nlattr * const cda[],
2898 u_int8_t u3, u32 portid, int report)
2899 {
2900 struct nf_conntrack_tuple tuple, mask, master_tuple;
2901 struct nf_conntrack_tuple_hash *h = NULL;
2902 struct nf_conntrack_helper *helper = NULL;
2903 struct nf_conntrack_expect *exp;
2904 struct nf_conn *ct;
2905 int err;
2906
2907 /* caller guarantees that those three CTA_EXPECT_* exist */
2908 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2909 if (err < 0)
2910 return err;
2911 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2912 if (err < 0)
2913 return err;
2914 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2915 if (err < 0)
2916 return err;
2917
2918 /* Look for master conntrack of this expectation */
2919 h = nf_conntrack_find_get(net, zone, &master_tuple);
2920 if (!h)
2921 return -ENOENT;
2922 ct = nf_ct_tuplehash_to_ctrack(h);
2923
2924 if (cda[CTA_EXPECT_HELP_NAME]) {
2925 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2926
2927 helper = __nf_conntrack_helper_find(helpname, u3,
2928 nf_ct_protonum(ct));
2929 if (helper == NULL) {
2930 #ifdef CONFIG_MODULES
2931 if (request_module("nfct-helper-%s", helpname) < 0) {
2932 err = -EOPNOTSUPP;
2933 goto err_ct;
2934 }
2935 helper = __nf_conntrack_helper_find(helpname, u3,
2936 nf_ct_protonum(ct));
2937 if (helper) {
2938 err = -EAGAIN;
2939 goto err_ct;
2940 }
2941 #endif
2942 err = -EOPNOTSUPP;
2943 goto err_ct;
2944 }
2945 }
2946
2947 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
2948 if (IS_ERR(exp)) {
2949 err = PTR_ERR(exp);
2950 goto err_ct;
2951 }
2952
2953 err = nf_ct_expect_related_report(exp, portid, report);
2954 if (err < 0)
2955 goto err_exp;
2956
2957 return 0;
2958 err_exp:
2959 nf_ct_expect_put(exp);
2960 err_ct:
2961 nf_ct_put(ct);
2962 return err;
2963 }
2964
2965 static int
2966 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2967 const struct nlmsghdr *nlh,
2968 const struct nlattr * const cda[])
2969 {
2970 struct net *net = sock_net(ctnl);
2971 struct nf_conntrack_tuple tuple;
2972 struct nf_conntrack_expect *exp;
2973 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2974 u_int8_t u3 = nfmsg->nfgen_family;
2975 u16 zone;
2976 int err;
2977
2978 if (!cda[CTA_EXPECT_TUPLE]
2979 || !cda[CTA_EXPECT_MASK]
2980 || !cda[CTA_EXPECT_MASTER])
2981 return -EINVAL;
2982
2983 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2984 if (err < 0)
2985 return err;
2986
2987 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2988 if (err < 0)
2989 return err;
2990
2991 spin_lock_bh(&nf_conntrack_expect_lock);
2992 exp = __nf_ct_expect_find(net, zone, &tuple);
2993
2994 if (!exp) {
2995 spin_unlock_bh(&nf_conntrack_expect_lock);
2996 err = -ENOENT;
2997 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2998 err = ctnetlink_create_expect(net, zone, cda,
2999 u3,
3000 NETLINK_CB(skb).portid,
3001 nlmsg_report(nlh));
3002 }
3003 return err;
3004 }
3005
3006 err = -EEXIST;
3007 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3008 err = ctnetlink_change_expect(exp, cda);
3009 spin_unlock_bh(&nf_conntrack_expect_lock);
3010
3011 return err;
3012 }
3013
3014 static int
3015 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3016 const struct ip_conntrack_stat *st)
3017 {
3018 struct nlmsghdr *nlh;
3019 struct nfgenmsg *nfmsg;
3020 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3021
3022 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
3023 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3024 if (nlh == NULL)
3025 goto nlmsg_failure;
3026
3027 nfmsg = nlmsg_data(nlh);
3028 nfmsg->nfgen_family = AF_UNSPEC;
3029 nfmsg->version = NFNETLINK_V0;
3030 nfmsg->res_id = htons(cpu);
3031
3032 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3033 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3034 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3035 goto nla_put_failure;
3036
3037 nlmsg_end(skb, nlh);
3038 return skb->len;
3039
3040 nla_put_failure:
3041 nlmsg_failure:
3042 nlmsg_cancel(skb, nlh);
3043 return -1;
3044 }
3045
3046 static int
3047 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3048 {
3049 int cpu;
3050 struct net *net = sock_net(skb->sk);
3051
3052 if (cb->args[0] == nr_cpu_ids)
3053 return 0;
3054
3055 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3056 const struct ip_conntrack_stat *st;
3057
3058 if (!cpu_possible(cpu))
3059 continue;
3060
3061 st = per_cpu_ptr(net->ct.stat, cpu);
3062 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3063 cb->nlh->nlmsg_seq,
3064 cpu, st) < 0)
3065 break;
3066 }
3067 cb->args[0] = cpu;
3068
3069 return skb->len;
3070 }
3071
3072 static int
3073 ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
3074 const struct nlmsghdr *nlh,
3075 const struct nlattr * const cda[])
3076 {
3077 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3078 struct netlink_dump_control c = {
3079 .dump = ctnetlink_exp_stat_cpu_dump,
3080 };
3081 return netlink_dump_start(ctnl, skb, nlh, &c);
3082 }
3083
3084 return 0;
3085 }
3086
3087 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3088 static struct nf_ct_event_notifier ctnl_notifier = {
3089 .fcn = ctnetlink_conntrack_event,
3090 };
3091
3092 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3093 .fcn = ctnetlink_expect_event,
3094 };
3095 #endif
3096
3097 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3098 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3099 .attr_count = CTA_MAX,
3100 .policy = ct_nla_policy },
3101 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3102 .attr_count = CTA_MAX,
3103 .policy = ct_nla_policy },
3104 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3105 .attr_count = CTA_MAX,
3106 .policy = ct_nla_policy },
3107 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3108 .attr_count = CTA_MAX,
3109 .policy = ct_nla_policy },
3110 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3111 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3112 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3113 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3114 };
3115
3116 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3117 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3118 .attr_count = CTA_EXPECT_MAX,
3119 .policy = exp_nla_policy },
3120 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3121 .attr_count = CTA_EXPECT_MAX,
3122 .policy = exp_nla_policy },
3123 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3124 .attr_count = CTA_EXPECT_MAX,
3125 .policy = exp_nla_policy },
3126 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3127 };
3128
3129 static const struct nfnetlink_subsystem ctnl_subsys = {
3130 .name = "conntrack",
3131 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3132 .cb_count = IPCTNL_MSG_MAX,
3133 .cb = ctnl_cb,
3134 };
3135
3136 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3137 .name = "conntrack_expect",
3138 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3139 .cb_count = IPCTNL_MSG_EXP_MAX,
3140 .cb = ctnl_exp_cb,
3141 };
3142
3143 MODULE_ALIAS("ip_conntrack_netlink");
3144 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3145 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3146
3147 static int __net_init ctnetlink_net_init(struct net *net)
3148 {
3149 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3150 int ret;
3151
3152 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3153 if (ret < 0) {
3154 pr_err("ctnetlink_init: cannot register notifier.\n");
3155 goto err_out;
3156 }
3157
3158 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3159 if (ret < 0) {
3160 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3161 goto err_unreg_notifier;
3162 }
3163 #endif
3164 return 0;
3165
3166 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3167 err_unreg_notifier:
3168 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3169 err_out:
3170 return ret;
3171 #endif
3172 }
3173
3174 static void ctnetlink_net_exit(struct net *net)
3175 {
3176 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3177 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3178 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3179 #endif
3180 }
3181
3182 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3183 {
3184 struct net *net;
3185
3186 list_for_each_entry(net, net_exit_list, exit_list)
3187 ctnetlink_net_exit(net);
3188 }
3189
3190 static struct pernet_operations ctnetlink_net_ops = {
3191 .init = ctnetlink_net_init,
3192 .exit_batch = ctnetlink_net_exit_batch,
3193 };
3194
3195 static int __init ctnetlink_init(void)
3196 {
3197 int ret;
3198
3199 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3200 ret = nfnetlink_subsys_register(&ctnl_subsys);
3201 if (ret < 0) {
3202 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3203 goto err_out;
3204 }
3205
3206 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3207 if (ret < 0) {
3208 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3209 goto err_unreg_subsys;
3210 }
3211
3212 ret = register_pernet_subsys(&ctnetlink_net_ops);
3213 if (ret < 0) {
3214 pr_err("ctnetlink_init: cannot register pernet operations\n");
3215 goto err_unreg_exp_subsys;
3216 }
3217 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3218 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3219 RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
3220 #endif
3221 return 0;
3222
3223 err_unreg_exp_subsys:
3224 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3225 err_unreg_subsys:
3226 nfnetlink_subsys_unregister(&ctnl_subsys);
3227 err_out:
3228 return ret;
3229 }
3230
3231 static void __exit ctnetlink_exit(void)
3232 {
3233 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3234
3235 unregister_pernet_subsys(&ctnetlink_net_ops);
3236 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3237 nfnetlink_subsys_unregister(&ctnl_subsys);
3238 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3239 RCU_INIT_POINTER(nfq_ct_hook, NULL);
3240 #endif
3241 }
3242
3243 module_init(ctnetlink_init);
3244 module_exit(ctnetlink_exit);
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