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[deliverable/linux.git] / net / netfilter / nf_conntrack_netlink.c
1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2012 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 #ifdef CONFIG_NF_CONNTRACK_ZONES
601 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE */
602 #endif
603 + ctnetlink_proto_size(ct)
604 + ctnetlink_label_size(ct)
605 ;
606 }
607
608 #ifdef CONFIG_NF_CONNTRACK_EVENTS
609 static int
610 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
611 {
612 struct net *net;
613 struct nlmsghdr *nlh;
614 struct nfgenmsg *nfmsg;
615 struct nlattr *nest_parms;
616 struct nf_conn *ct = item->ct;
617 struct sk_buff *skb;
618 unsigned int type;
619 unsigned int flags = 0, group;
620 int err;
621
622 /* ignore our fake conntrack entry */
623 if (nf_ct_is_untracked(ct))
624 return 0;
625
626 if (events & (1 << IPCT_DESTROY)) {
627 type = IPCTNL_MSG_CT_DELETE;
628 group = NFNLGRP_CONNTRACK_DESTROY;
629 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
630 type = IPCTNL_MSG_CT_NEW;
631 flags = NLM_F_CREATE|NLM_F_EXCL;
632 group = NFNLGRP_CONNTRACK_NEW;
633 } else if (events) {
634 type = IPCTNL_MSG_CT_NEW;
635 group = NFNLGRP_CONNTRACK_UPDATE;
636 } else
637 return 0;
638
639 net = nf_ct_net(ct);
640 if (!item->report && !nfnetlink_has_listeners(net, group))
641 return 0;
642
643 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
644 if (skb == NULL)
645 goto errout;
646
647 type |= NFNL_SUBSYS_CTNETLINK << 8;
648 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
649 if (nlh == NULL)
650 goto nlmsg_failure;
651
652 nfmsg = nlmsg_data(nlh);
653 nfmsg->nfgen_family = nf_ct_l3num(ct);
654 nfmsg->version = NFNETLINK_V0;
655 nfmsg->res_id = 0;
656
657 rcu_read_lock();
658 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
659 if (!nest_parms)
660 goto nla_put_failure;
661 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
662 goto nla_put_failure;
663 nla_nest_end(skb, nest_parms);
664
665 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
666 if (!nest_parms)
667 goto nla_put_failure;
668 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
669 goto nla_put_failure;
670 nla_nest_end(skb, nest_parms);
671
672 if (nf_ct_zone(ct) &&
673 nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
674 goto nla_put_failure;
675
676 if (ctnetlink_dump_id(skb, ct) < 0)
677 goto nla_put_failure;
678
679 if (ctnetlink_dump_status(skb, ct) < 0)
680 goto nla_put_failure;
681
682 if (events & (1 << IPCT_DESTROY)) {
683 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
684 ctnetlink_dump_timestamp(skb, ct) < 0)
685 goto nla_put_failure;
686 } else {
687 if (ctnetlink_dump_timeout(skb, ct) < 0)
688 goto nla_put_failure;
689
690 if (events & (1 << IPCT_PROTOINFO)
691 && ctnetlink_dump_protoinfo(skb, ct) < 0)
692 goto nla_put_failure;
693
694 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
695 && ctnetlink_dump_helpinfo(skb, ct) < 0)
696 goto nla_put_failure;
697
698 #ifdef CONFIG_NF_CONNTRACK_SECMARK
699 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
700 && ctnetlink_dump_secctx(skb, ct) < 0)
701 goto nla_put_failure;
702 #endif
703 if (events & (1 << IPCT_LABEL) &&
704 ctnetlink_dump_labels(skb, ct) < 0)
705 goto nla_put_failure;
706
707 if (events & (1 << IPCT_RELATED) &&
708 ctnetlink_dump_master(skb, ct) < 0)
709 goto nla_put_failure;
710
711 if (events & (1 << IPCT_SEQADJ) &&
712 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
713 goto nla_put_failure;
714 }
715
716 #ifdef CONFIG_NF_CONNTRACK_MARK
717 if ((events & (1 << IPCT_MARK) || ct->mark)
718 && ctnetlink_dump_mark(skb, ct) < 0)
719 goto nla_put_failure;
720 #endif
721 rcu_read_unlock();
722
723 nlmsg_end(skb, nlh);
724 err = nfnetlink_send(skb, net, item->portid, group, item->report,
725 GFP_ATOMIC);
726 if (err == -ENOBUFS || err == -EAGAIN)
727 return -ENOBUFS;
728
729 return 0;
730
731 nla_put_failure:
732 rcu_read_unlock();
733 nlmsg_cancel(skb, nlh);
734 nlmsg_failure:
735 kfree_skb(skb);
736 errout:
737 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
738 return -ENOBUFS;
739
740 return 0;
741 }
742 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
743
744 static int ctnetlink_done(struct netlink_callback *cb)
745 {
746 if (cb->args[1])
747 nf_ct_put((struct nf_conn *)cb->args[1]);
748 kfree(cb->data);
749 return 0;
750 }
751
752 struct ctnetlink_dump_filter {
753 struct {
754 u_int32_t val;
755 u_int32_t mask;
756 } mark;
757 };
758
759 static int
760 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
761 {
762 struct net *net = sock_net(skb->sk);
763 struct nf_conn *ct, *last;
764 struct nf_conntrack_tuple_hash *h;
765 struct hlist_nulls_node *n;
766 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
767 u_int8_t l3proto = nfmsg->nfgen_family;
768 int res;
769 spinlock_t *lockp;
770
771 #ifdef CONFIG_NF_CONNTRACK_MARK
772 const struct ctnetlink_dump_filter *filter = cb->data;
773 #endif
774
775 last = (struct nf_conn *)cb->args[1];
776
777 local_bh_disable();
778 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
779 restart:
780 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
781 spin_lock(lockp);
782 if (cb->args[0] >= net->ct.htable_size) {
783 spin_unlock(lockp);
784 goto out;
785 }
786 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
787 hnnode) {
788 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
789 continue;
790 ct = nf_ct_tuplehash_to_ctrack(h);
791 /* Dump entries of a given L3 protocol number.
792 * If it is not specified, ie. l3proto == 0,
793 * then dump everything. */
794 if (l3proto && nf_ct_l3num(ct) != l3proto)
795 continue;
796 if (cb->args[1]) {
797 if (ct != last)
798 continue;
799 cb->args[1] = 0;
800 }
801 #ifdef CONFIG_NF_CONNTRACK_MARK
802 if (filter && !((ct->mark & filter->mark.mask) ==
803 filter->mark.val)) {
804 continue;
805 }
806 #endif
807 rcu_read_lock();
808 res =
809 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
810 cb->nlh->nlmsg_seq,
811 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
812 ct);
813 rcu_read_unlock();
814 if (res < 0) {
815 nf_conntrack_get(&ct->ct_general);
816 cb->args[1] = (unsigned long)ct;
817 spin_unlock(lockp);
818 goto out;
819 }
820 }
821 spin_unlock(lockp);
822 if (cb->args[1]) {
823 cb->args[1] = 0;
824 goto restart;
825 }
826 }
827 out:
828 local_bh_enable();
829 if (last)
830 nf_ct_put(last);
831
832 return skb->len;
833 }
834
835 static inline int
836 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
837 {
838 struct nlattr *tb[CTA_IP_MAX+1];
839 struct nf_conntrack_l3proto *l3proto;
840 int ret = 0;
841
842 ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
843 if (ret < 0)
844 return ret;
845
846 rcu_read_lock();
847 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
848
849 if (likely(l3proto->nlattr_to_tuple)) {
850 ret = nla_validate_nested(attr, CTA_IP_MAX,
851 l3proto->nla_policy);
852 if (ret == 0)
853 ret = l3proto->nlattr_to_tuple(tb, tuple);
854 }
855
856 rcu_read_unlock();
857
858 return ret;
859 }
860
861 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
862 [CTA_PROTO_NUM] = { .type = NLA_U8 },
863 };
864
865 static inline int
866 ctnetlink_parse_tuple_proto(struct nlattr *attr,
867 struct nf_conntrack_tuple *tuple)
868 {
869 struct nlattr *tb[CTA_PROTO_MAX+1];
870 struct nf_conntrack_l4proto *l4proto;
871 int ret = 0;
872
873 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
874 if (ret < 0)
875 return ret;
876
877 if (!tb[CTA_PROTO_NUM])
878 return -EINVAL;
879 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
880
881 rcu_read_lock();
882 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
883
884 if (likely(l4proto->nlattr_to_tuple)) {
885 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
886 l4proto->nla_policy);
887 if (ret == 0)
888 ret = l4proto->nlattr_to_tuple(tb, tuple);
889 }
890
891 rcu_read_unlock();
892
893 return ret;
894 }
895
896 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
897 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
898 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
899 };
900
901 static int
902 ctnetlink_parse_tuple(const struct nlattr * const cda[],
903 struct nf_conntrack_tuple *tuple,
904 enum ctattr_type type, u_int8_t l3num)
905 {
906 struct nlattr *tb[CTA_TUPLE_MAX+1];
907 int err;
908
909 memset(tuple, 0, sizeof(*tuple));
910
911 err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
912 if (err < 0)
913 return err;
914
915 if (!tb[CTA_TUPLE_IP])
916 return -EINVAL;
917
918 tuple->src.l3num = l3num;
919
920 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
921 if (err < 0)
922 return err;
923
924 if (!tb[CTA_TUPLE_PROTO])
925 return -EINVAL;
926
927 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
928 if (err < 0)
929 return err;
930
931 /* orig and expect tuples get DIR_ORIGINAL */
932 if (type == CTA_TUPLE_REPLY)
933 tuple->dst.dir = IP_CT_DIR_REPLY;
934 else
935 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
936
937 return 0;
938 }
939
940 static int
941 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
942 {
943 if (attr)
944 #ifdef CONFIG_NF_CONNTRACK_ZONES
945 *zone = ntohs(nla_get_be16(attr));
946 #else
947 return -EOPNOTSUPP;
948 #endif
949 else
950 *zone = 0;
951
952 return 0;
953 }
954
955 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
956 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
957 .len = NF_CT_HELPER_NAME_LEN - 1 },
958 };
959
960 static inline int
961 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
962 struct nlattr **helpinfo)
963 {
964 int err;
965 struct nlattr *tb[CTA_HELP_MAX+1];
966
967 err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
968 if (err < 0)
969 return err;
970
971 if (!tb[CTA_HELP_NAME])
972 return -EINVAL;
973
974 *helper_name = nla_data(tb[CTA_HELP_NAME]);
975
976 if (tb[CTA_HELP_INFO])
977 *helpinfo = tb[CTA_HELP_INFO];
978
979 return 0;
980 }
981
982 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
983 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
984 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
985 [CTA_STATUS] = { .type = NLA_U32 },
986 [CTA_PROTOINFO] = { .type = NLA_NESTED },
987 [CTA_HELP] = { .type = NLA_NESTED },
988 [CTA_NAT_SRC] = { .type = NLA_NESTED },
989 [CTA_TIMEOUT] = { .type = NLA_U32 },
990 [CTA_MARK] = { .type = NLA_U32 },
991 [CTA_ID] = { .type = NLA_U32 },
992 [CTA_NAT_DST] = { .type = NLA_NESTED },
993 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
994 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
995 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
996 [CTA_ZONE] = { .type = NLA_U16 },
997 [CTA_MARK_MASK] = { .type = NLA_U32 },
998 [CTA_LABELS] = { .type = NLA_BINARY,
999 .len = NF_CT_LABELS_MAX_SIZE },
1000 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1001 .len = NF_CT_LABELS_MAX_SIZE },
1002 };
1003
1004 static int
1005 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
1006 const struct nlmsghdr *nlh,
1007 const struct nlattr * const cda[])
1008 {
1009 struct net *net = sock_net(ctnl);
1010 struct nf_conntrack_tuple_hash *h;
1011 struct nf_conntrack_tuple tuple;
1012 struct nf_conn *ct;
1013 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1014 u_int8_t u3 = nfmsg->nfgen_family;
1015 u16 zone;
1016 int err;
1017
1018 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1019 if (err < 0)
1020 return err;
1021
1022 if (cda[CTA_TUPLE_ORIG])
1023 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1024 else if (cda[CTA_TUPLE_REPLY])
1025 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1026 else {
1027 /* Flush the whole table */
1028 nf_conntrack_flush_report(net,
1029 NETLINK_CB(skb).portid,
1030 nlmsg_report(nlh));
1031 return 0;
1032 }
1033
1034 if (err < 0)
1035 return err;
1036
1037 h = nf_conntrack_find_get(net, zone, &tuple);
1038 if (!h)
1039 return -ENOENT;
1040
1041 ct = nf_ct_tuplehash_to_ctrack(h);
1042
1043 if (cda[CTA_ID]) {
1044 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1045 if (id != (u32)(unsigned long)ct) {
1046 nf_ct_put(ct);
1047 return -ENOENT;
1048 }
1049 }
1050
1051 if (del_timer(&ct->timeout))
1052 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1053
1054 nf_ct_put(ct);
1055
1056 return 0;
1057 }
1058
1059 static int
1060 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
1061 const struct nlmsghdr *nlh,
1062 const struct nlattr * const cda[])
1063 {
1064 struct net *net = sock_net(ctnl);
1065 struct nf_conntrack_tuple_hash *h;
1066 struct nf_conntrack_tuple tuple;
1067 struct nf_conn *ct;
1068 struct sk_buff *skb2 = NULL;
1069 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1070 u_int8_t u3 = nfmsg->nfgen_family;
1071 u16 zone;
1072 int err;
1073
1074 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1075 struct netlink_dump_control c = {
1076 .dump = ctnetlink_dump_table,
1077 .done = ctnetlink_done,
1078 };
1079 #ifdef CONFIG_NF_CONNTRACK_MARK
1080 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1081 struct ctnetlink_dump_filter *filter;
1082
1083 filter = kzalloc(sizeof(struct ctnetlink_dump_filter),
1084 GFP_ATOMIC);
1085 if (filter == NULL)
1086 return -ENOMEM;
1087
1088 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
1089 filter->mark.mask =
1090 ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1091 c.data = filter;
1092 }
1093 #endif
1094 return netlink_dump_start(ctnl, skb, nlh, &c);
1095 }
1096
1097 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1098 if (err < 0)
1099 return err;
1100
1101 if (cda[CTA_TUPLE_ORIG])
1102 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1103 else if (cda[CTA_TUPLE_REPLY])
1104 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1105 else
1106 return -EINVAL;
1107
1108 if (err < 0)
1109 return err;
1110
1111 h = nf_conntrack_find_get(net, zone, &tuple);
1112 if (!h)
1113 return -ENOENT;
1114
1115 ct = nf_ct_tuplehash_to_ctrack(h);
1116
1117 err = -ENOMEM;
1118 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1119 if (skb2 == NULL) {
1120 nf_ct_put(ct);
1121 return -ENOMEM;
1122 }
1123
1124 rcu_read_lock();
1125 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1126 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1127 rcu_read_unlock();
1128 nf_ct_put(ct);
1129 if (err <= 0)
1130 goto free;
1131
1132 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1133 if (err < 0)
1134 goto out;
1135
1136 return 0;
1137
1138 free:
1139 kfree_skb(skb2);
1140 out:
1141 /* this avoids a loop in nfnetlink. */
1142 return err == -EAGAIN ? -ENOBUFS : err;
1143 }
1144
1145 static int ctnetlink_done_list(struct netlink_callback *cb)
1146 {
1147 if (cb->args[1])
1148 nf_ct_put((struct nf_conn *)cb->args[1]);
1149 return 0;
1150 }
1151
1152 static int
1153 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1154 {
1155 struct nf_conn *ct, *last;
1156 struct nf_conntrack_tuple_hash *h;
1157 struct hlist_nulls_node *n;
1158 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1159 u_int8_t l3proto = nfmsg->nfgen_family;
1160 int res;
1161 int cpu;
1162 struct hlist_nulls_head *list;
1163 struct net *net = sock_net(skb->sk);
1164
1165 if (cb->args[2])
1166 return 0;
1167
1168 last = (struct nf_conn *)cb->args[1];
1169
1170 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1171 struct ct_pcpu *pcpu;
1172
1173 if (!cpu_possible(cpu))
1174 continue;
1175
1176 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1177 spin_lock_bh(&pcpu->lock);
1178 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1179 restart:
1180 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1181 ct = nf_ct_tuplehash_to_ctrack(h);
1182 if (l3proto && nf_ct_l3num(ct) != l3proto)
1183 continue;
1184 if (cb->args[1]) {
1185 if (ct != last)
1186 continue;
1187 cb->args[1] = 0;
1188 }
1189 rcu_read_lock();
1190 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1191 cb->nlh->nlmsg_seq,
1192 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1193 ct);
1194 rcu_read_unlock();
1195 if (res < 0) {
1196 if (!atomic_inc_not_zero(&ct->ct_general.use))
1197 continue;
1198 cb->args[0] = cpu;
1199 cb->args[1] = (unsigned long)ct;
1200 spin_unlock_bh(&pcpu->lock);
1201 goto out;
1202 }
1203 }
1204 if (cb->args[1]) {
1205 cb->args[1] = 0;
1206 goto restart;
1207 }
1208 spin_unlock_bh(&pcpu->lock);
1209 }
1210 cb->args[2] = 1;
1211 out:
1212 if (last)
1213 nf_ct_put(last);
1214
1215 return skb->len;
1216 }
1217
1218 static int
1219 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1220 {
1221 return ctnetlink_dump_list(skb, cb, true);
1222 }
1223
1224 static int
1225 ctnetlink_get_ct_dying(struct sock *ctnl, struct sk_buff *skb,
1226 const struct nlmsghdr *nlh,
1227 const struct nlattr * const cda[])
1228 {
1229 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1230 struct netlink_dump_control c = {
1231 .dump = ctnetlink_dump_dying,
1232 .done = ctnetlink_done_list,
1233 };
1234 return netlink_dump_start(ctnl, skb, nlh, &c);
1235 }
1236
1237 return -EOPNOTSUPP;
1238 }
1239
1240 static int
1241 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1242 {
1243 return ctnetlink_dump_list(skb, cb, false);
1244 }
1245
1246 static int
1247 ctnetlink_get_ct_unconfirmed(struct sock *ctnl, struct sk_buff *skb,
1248 const struct nlmsghdr *nlh,
1249 const struct nlattr * const cda[])
1250 {
1251 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1252 struct netlink_dump_control c = {
1253 .dump = ctnetlink_dump_unconfirmed,
1254 .done = ctnetlink_done_list,
1255 };
1256 return netlink_dump_start(ctnl, skb, nlh, &c);
1257 }
1258
1259 return -EOPNOTSUPP;
1260 }
1261
1262 #ifdef CONFIG_NF_NAT_NEEDED
1263 static int
1264 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1265 enum nf_nat_manip_type manip,
1266 const struct nlattr *attr)
1267 {
1268 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1269 int err;
1270
1271 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1272 if (!parse_nat_setup) {
1273 #ifdef CONFIG_MODULES
1274 rcu_read_unlock();
1275 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1276 if (request_module("nf-nat") < 0) {
1277 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1278 rcu_read_lock();
1279 return -EOPNOTSUPP;
1280 }
1281 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1282 rcu_read_lock();
1283 if (nfnetlink_parse_nat_setup_hook)
1284 return -EAGAIN;
1285 #endif
1286 return -EOPNOTSUPP;
1287 }
1288
1289 err = parse_nat_setup(ct, manip, attr);
1290 if (err == -EAGAIN) {
1291 #ifdef CONFIG_MODULES
1292 rcu_read_unlock();
1293 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1294 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1295 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1296 rcu_read_lock();
1297 return -EOPNOTSUPP;
1298 }
1299 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1300 rcu_read_lock();
1301 #else
1302 err = -EOPNOTSUPP;
1303 #endif
1304 }
1305 return err;
1306 }
1307 #endif
1308
1309 static int
1310 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1311 {
1312 unsigned long d;
1313 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1314 d = ct->status ^ status;
1315
1316 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1317 /* unchangeable */
1318 return -EBUSY;
1319
1320 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1321 /* SEEN_REPLY bit can only be set */
1322 return -EBUSY;
1323
1324 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1325 /* ASSURED bit can only be set */
1326 return -EBUSY;
1327
1328 /* Be careful here, modifying NAT bits can screw up things,
1329 * so don't let users modify them directly if they don't pass
1330 * nf_nat_range. */
1331 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1332 return 0;
1333 }
1334
1335 static int
1336 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1337 {
1338 #ifdef CONFIG_NF_NAT_NEEDED
1339 int ret;
1340
1341 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1342 return 0;
1343
1344 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1345 cda[CTA_NAT_DST]);
1346 if (ret < 0)
1347 return ret;
1348
1349 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1350 cda[CTA_NAT_SRC]);
1351 return ret;
1352 #else
1353 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1354 return 0;
1355 return -EOPNOTSUPP;
1356 #endif
1357 }
1358
1359 static inline int
1360 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1361 {
1362 struct nf_conntrack_helper *helper;
1363 struct nf_conn_help *help = nfct_help(ct);
1364 char *helpname = NULL;
1365 struct nlattr *helpinfo = NULL;
1366 int err;
1367
1368 /* don't change helper of sibling connections */
1369 if (ct->master)
1370 return -EBUSY;
1371
1372 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1373 if (err < 0)
1374 return err;
1375
1376 if (!strcmp(helpname, "")) {
1377 if (help && help->helper) {
1378 /* we had a helper before ... */
1379 nf_ct_remove_expectations(ct);
1380 RCU_INIT_POINTER(help->helper, NULL);
1381 }
1382
1383 return 0;
1384 }
1385
1386 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1387 nf_ct_protonum(ct));
1388 if (helper == NULL) {
1389 #ifdef CONFIG_MODULES
1390 spin_unlock_bh(&nf_conntrack_expect_lock);
1391
1392 if (request_module("nfct-helper-%s", helpname) < 0) {
1393 spin_lock_bh(&nf_conntrack_expect_lock);
1394 return -EOPNOTSUPP;
1395 }
1396
1397 spin_lock_bh(&nf_conntrack_expect_lock);
1398 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1399 nf_ct_protonum(ct));
1400 if (helper)
1401 return -EAGAIN;
1402 #endif
1403 return -EOPNOTSUPP;
1404 }
1405
1406 if (help) {
1407 if (help->helper == helper) {
1408 /* update private helper data if allowed. */
1409 if (helper->from_nlattr)
1410 helper->from_nlattr(helpinfo, ct);
1411 return 0;
1412 } else
1413 return -EBUSY;
1414 }
1415
1416 /* we cannot set a helper for an existing conntrack */
1417 return -EOPNOTSUPP;
1418 }
1419
1420 static inline int
1421 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1422 {
1423 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1424
1425 if (!del_timer(&ct->timeout))
1426 return -ETIME;
1427
1428 ct->timeout.expires = jiffies + timeout * HZ;
1429 add_timer(&ct->timeout);
1430
1431 return 0;
1432 }
1433
1434 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1435 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1436 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1437 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1438 };
1439
1440 static inline int
1441 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1442 {
1443 const struct nlattr *attr = cda[CTA_PROTOINFO];
1444 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1445 struct nf_conntrack_l4proto *l4proto;
1446 int err = 0;
1447
1448 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1449 if (err < 0)
1450 return err;
1451
1452 rcu_read_lock();
1453 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1454 if (l4proto->from_nlattr)
1455 err = l4proto->from_nlattr(tb, ct);
1456 rcu_read_unlock();
1457
1458 return err;
1459 }
1460
1461 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1462 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1463 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1464 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1465 };
1466
1467 static inline int
1468 change_seq_adj(struct nf_ct_seqadj *seq, const struct nlattr * const attr)
1469 {
1470 int err;
1471 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1472
1473 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1474 if (err < 0)
1475 return err;
1476
1477 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1478 return -EINVAL;
1479
1480 seq->correction_pos =
1481 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1482
1483 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1484 return -EINVAL;
1485
1486 seq->offset_before =
1487 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1488
1489 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1490 return -EINVAL;
1491
1492 seq->offset_after =
1493 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1494
1495 return 0;
1496 }
1497
1498 static int
1499 ctnetlink_change_seq_adj(struct nf_conn *ct,
1500 const struct nlattr * const cda[])
1501 {
1502 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1503 int ret = 0;
1504
1505 if (!seqadj)
1506 return 0;
1507
1508 if (cda[CTA_SEQ_ADJ_ORIG]) {
1509 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1510 cda[CTA_SEQ_ADJ_ORIG]);
1511 if (ret < 0)
1512 return ret;
1513
1514 ct->status |= IPS_SEQ_ADJUST;
1515 }
1516
1517 if (cda[CTA_SEQ_ADJ_REPLY]) {
1518 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1519 cda[CTA_SEQ_ADJ_REPLY]);
1520 if (ret < 0)
1521 return ret;
1522
1523 ct->status |= IPS_SEQ_ADJUST;
1524 }
1525
1526 return 0;
1527 }
1528
1529 static int
1530 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1531 {
1532 #ifdef CONFIG_NF_CONNTRACK_LABELS
1533 size_t len = nla_len(cda[CTA_LABELS]);
1534 const void *mask = cda[CTA_LABELS_MASK];
1535
1536 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1537 return -EINVAL;
1538
1539 if (mask) {
1540 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1541 nla_len(cda[CTA_LABELS_MASK]) != len)
1542 return -EINVAL;
1543 mask = nla_data(cda[CTA_LABELS_MASK]);
1544 }
1545
1546 len /= sizeof(u32);
1547
1548 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1549 #else
1550 return -EOPNOTSUPP;
1551 #endif
1552 }
1553
1554 static int
1555 ctnetlink_change_conntrack(struct nf_conn *ct,
1556 const struct nlattr * const cda[])
1557 {
1558 int err;
1559
1560 /* only allow NAT changes and master assignation for new conntracks */
1561 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1562 return -EOPNOTSUPP;
1563
1564 if (cda[CTA_HELP]) {
1565 err = ctnetlink_change_helper(ct, cda);
1566 if (err < 0)
1567 return err;
1568 }
1569
1570 if (cda[CTA_TIMEOUT]) {
1571 err = ctnetlink_change_timeout(ct, cda);
1572 if (err < 0)
1573 return err;
1574 }
1575
1576 if (cda[CTA_STATUS]) {
1577 err = ctnetlink_change_status(ct, cda);
1578 if (err < 0)
1579 return err;
1580 }
1581
1582 if (cda[CTA_PROTOINFO]) {
1583 err = ctnetlink_change_protoinfo(ct, cda);
1584 if (err < 0)
1585 return err;
1586 }
1587
1588 #if defined(CONFIG_NF_CONNTRACK_MARK)
1589 if (cda[CTA_MARK])
1590 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1591 #endif
1592
1593 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1594 err = ctnetlink_change_seq_adj(ct, cda);
1595 if (err < 0)
1596 return err;
1597 }
1598
1599 if (cda[CTA_LABELS]) {
1600 err = ctnetlink_attach_labels(ct, cda);
1601 if (err < 0)
1602 return err;
1603 }
1604
1605 return 0;
1606 }
1607
1608 static struct nf_conn *
1609 ctnetlink_create_conntrack(struct net *net, u16 zone,
1610 const struct nlattr * const cda[],
1611 struct nf_conntrack_tuple *otuple,
1612 struct nf_conntrack_tuple *rtuple,
1613 u8 u3)
1614 {
1615 struct nf_conn *ct;
1616 int err = -EINVAL;
1617 struct nf_conntrack_helper *helper;
1618 struct nf_conn_tstamp *tstamp;
1619
1620 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1621 if (IS_ERR(ct))
1622 return ERR_PTR(-ENOMEM);
1623
1624 if (!cda[CTA_TIMEOUT])
1625 goto err1;
1626 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1627
1628 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1629
1630 rcu_read_lock();
1631 if (cda[CTA_HELP]) {
1632 char *helpname = NULL;
1633 struct nlattr *helpinfo = NULL;
1634
1635 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1636 if (err < 0)
1637 goto err2;
1638
1639 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1640 nf_ct_protonum(ct));
1641 if (helper == NULL) {
1642 rcu_read_unlock();
1643 #ifdef CONFIG_MODULES
1644 if (request_module("nfct-helper-%s", helpname) < 0) {
1645 err = -EOPNOTSUPP;
1646 goto err1;
1647 }
1648
1649 rcu_read_lock();
1650 helper = __nf_conntrack_helper_find(helpname,
1651 nf_ct_l3num(ct),
1652 nf_ct_protonum(ct));
1653 if (helper) {
1654 err = -EAGAIN;
1655 goto err2;
1656 }
1657 rcu_read_unlock();
1658 #endif
1659 err = -EOPNOTSUPP;
1660 goto err1;
1661 } else {
1662 struct nf_conn_help *help;
1663
1664 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1665 if (help == NULL) {
1666 err = -ENOMEM;
1667 goto err2;
1668 }
1669 /* set private helper data if allowed. */
1670 if (helper->from_nlattr)
1671 helper->from_nlattr(helpinfo, ct);
1672
1673 /* not in hash table yet so not strictly necessary */
1674 RCU_INIT_POINTER(help->helper, helper);
1675 }
1676 } else {
1677 /* try an implicit helper assignation */
1678 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1679 if (err < 0)
1680 goto err2;
1681 }
1682
1683 err = ctnetlink_setup_nat(ct, cda);
1684 if (err < 0)
1685 goto err2;
1686
1687 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1688 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1689 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1690 nf_ct_labels_ext_add(ct);
1691
1692 /* we must add conntrack extensions before confirmation. */
1693 ct->status |= IPS_CONFIRMED;
1694
1695 if (cda[CTA_STATUS]) {
1696 err = ctnetlink_change_status(ct, cda);
1697 if (err < 0)
1698 goto err2;
1699 }
1700
1701 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1702 err = ctnetlink_change_seq_adj(ct, cda);
1703 if (err < 0)
1704 goto err2;
1705 }
1706
1707 memset(&ct->proto, 0, sizeof(ct->proto));
1708 if (cda[CTA_PROTOINFO]) {
1709 err = ctnetlink_change_protoinfo(ct, cda);
1710 if (err < 0)
1711 goto err2;
1712 }
1713
1714 #if defined(CONFIG_NF_CONNTRACK_MARK)
1715 if (cda[CTA_MARK])
1716 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1717 #endif
1718
1719 /* setup master conntrack: this is a confirmed expectation */
1720 if (cda[CTA_TUPLE_MASTER]) {
1721 struct nf_conntrack_tuple master;
1722 struct nf_conntrack_tuple_hash *master_h;
1723 struct nf_conn *master_ct;
1724
1725 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1726 if (err < 0)
1727 goto err2;
1728
1729 master_h = nf_conntrack_find_get(net, zone, &master);
1730 if (master_h == NULL) {
1731 err = -ENOENT;
1732 goto err2;
1733 }
1734 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1735 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1736 ct->master = master_ct;
1737 }
1738 tstamp = nf_conn_tstamp_find(ct);
1739 if (tstamp)
1740 tstamp->start = ktime_get_real_ns();
1741
1742 err = nf_conntrack_hash_check_insert(ct);
1743 if (err < 0)
1744 goto err2;
1745
1746 rcu_read_unlock();
1747
1748 return ct;
1749
1750 err2:
1751 rcu_read_unlock();
1752 err1:
1753 nf_conntrack_free(ct);
1754 return ERR_PTR(err);
1755 }
1756
1757 static int
1758 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1759 const struct nlmsghdr *nlh,
1760 const struct nlattr * const cda[])
1761 {
1762 struct net *net = sock_net(ctnl);
1763 struct nf_conntrack_tuple otuple, rtuple;
1764 struct nf_conntrack_tuple_hash *h = NULL;
1765 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1766 struct nf_conn *ct;
1767 u_int8_t u3 = nfmsg->nfgen_family;
1768 u16 zone;
1769 int err;
1770
1771 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1772 if (err < 0)
1773 return err;
1774
1775 if (cda[CTA_TUPLE_ORIG]) {
1776 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1777 if (err < 0)
1778 return err;
1779 }
1780
1781 if (cda[CTA_TUPLE_REPLY]) {
1782 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1783 if (err < 0)
1784 return err;
1785 }
1786
1787 if (cda[CTA_TUPLE_ORIG])
1788 h = nf_conntrack_find_get(net, zone, &otuple);
1789 else if (cda[CTA_TUPLE_REPLY])
1790 h = nf_conntrack_find_get(net, zone, &rtuple);
1791
1792 if (h == NULL) {
1793 err = -ENOENT;
1794 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1795 enum ip_conntrack_events events;
1796
1797 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1798 return -EINVAL;
1799
1800 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1801 &rtuple, u3);
1802 if (IS_ERR(ct))
1803 return PTR_ERR(ct);
1804
1805 err = 0;
1806 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1807 events = IPCT_RELATED;
1808 else
1809 events = IPCT_NEW;
1810
1811 if (cda[CTA_LABELS] &&
1812 ctnetlink_attach_labels(ct, cda) == 0)
1813 events |= (1 << IPCT_LABEL);
1814
1815 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1816 (1 << IPCT_ASSURED) |
1817 (1 << IPCT_HELPER) |
1818 (1 << IPCT_PROTOINFO) |
1819 (1 << IPCT_SEQADJ) |
1820 (1 << IPCT_MARK) | events,
1821 ct, NETLINK_CB(skb).portid,
1822 nlmsg_report(nlh));
1823 nf_ct_put(ct);
1824 }
1825
1826 return err;
1827 }
1828 /* implicit 'else' */
1829
1830 err = -EEXIST;
1831 ct = nf_ct_tuplehash_to_ctrack(h);
1832 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1833 spin_lock_bh(&nf_conntrack_expect_lock);
1834 err = ctnetlink_change_conntrack(ct, cda);
1835 spin_unlock_bh(&nf_conntrack_expect_lock);
1836 if (err == 0) {
1837 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1838 (1 << IPCT_ASSURED) |
1839 (1 << IPCT_HELPER) |
1840 (1 << IPCT_LABEL) |
1841 (1 << IPCT_PROTOINFO) |
1842 (1 << IPCT_SEQADJ) |
1843 (1 << IPCT_MARK),
1844 ct, NETLINK_CB(skb).portid,
1845 nlmsg_report(nlh));
1846 }
1847 }
1848
1849 nf_ct_put(ct);
1850 return err;
1851 }
1852
1853 static int
1854 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1855 __u16 cpu, const struct ip_conntrack_stat *st)
1856 {
1857 struct nlmsghdr *nlh;
1858 struct nfgenmsg *nfmsg;
1859 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1860
1861 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1862 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1863 if (nlh == NULL)
1864 goto nlmsg_failure;
1865
1866 nfmsg = nlmsg_data(nlh);
1867 nfmsg->nfgen_family = AF_UNSPEC;
1868 nfmsg->version = NFNETLINK_V0;
1869 nfmsg->res_id = htons(cpu);
1870
1871 if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1872 nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1873 nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
1874 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1875 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1876 nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
1877 nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
1878 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1879 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1880 htonl(st->insert_failed)) ||
1881 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1882 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1883 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1884 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1885 htonl(st->search_restart)))
1886 goto nla_put_failure;
1887
1888 nlmsg_end(skb, nlh);
1889 return skb->len;
1890
1891 nla_put_failure:
1892 nlmsg_failure:
1893 nlmsg_cancel(skb, nlh);
1894 return -1;
1895 }
1896
1897 static int
1898 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
1899 {
1900 int cpu;
1901 struct net *net = sock_net(skb->sk);
1902
1903 if (cb->args[0] == nr_cpu_ids)
1904 return 0;
1905
1906 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1907 const struct ip_conntrack_stat *st;
1908
1909 if (!cpu_possible(cpu))
1910 continue;
1911
1912 st = per_cpu_ptr(net->ct.stat, cpu);
1913 if (ctnetlink_ct_stat_cpu_fill_info(skb,
1914 NETLINK_CB(cb->skb).portid,
1915 cb->nlh->nlmsg_seq,
1916 cpu, st) < 0)
1917 break;
1918 }
1919 cb->args[0] = cpu;
1920
1921 return skb->len;
1922 }
1923
1924 static int
1925 ctnetlink_stat_ct_cpu(struct sock *ctnl, struct sk_buff *skb,
1926 const struct nlmsghdr *nlh,
1927 const struct nlattr * const cda[])
1928 {
1929 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1930 struct netlink_dump_control c = {
1931 .dump = ctnetlink_ct_stat_cpu_dump,
1932 };
1933 return netlink_dump_start(ctnl, skb, nlh, &c);
1934 }
1935
1936 return 0;
1937 }
1938
1939 static int
1940 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
1941 struct net *net)
1942 {
1943 struct nlmsghdr *nlh;
1944 struct nfgenmsg *nfmsg;
1945 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1946 unsigned int nr_conntracks = atomic_read(&net->ct.count);
1947
1948 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
1949 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1950 if (nlh == NULL)
1951 goto nlmsg_failure;
1952
1953 nfmsg = nlmsg_data(nlh);
1954 nfmsg->nfgen_family = AF_UNSPEC;
1955 nfmsg->version = NFNETLINK_V0;
1956 nfmsg->res_id = 0;
1957
1958 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
1959 goto nla_put_failure;
1960
1961 nlmsg_end(skb, nlh);
1962 return skb->len;
1963
1964 nla_put_failure:
1965 nlmsg_failure:
1966 nlmsg_cancel(skb, nlh);
1967 return -1;
1968 }
1969
1970 static int
1971 ctnetlink_stat_ct(struct sock *ctnl, struct sk_buff *skb,
1972 const struct nlmsghdr *nlh,
1973 const struct nlattr * const cda[])
1974 {
1975 struct sk_buff *skb2;
1976 int err;
1977
1978 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1979 if (skb2 == NULL)
1980 return -ENOMEM;
1981
1982 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
1983 nlh->nlmsg_seq,
1984 NFNL_MSG_TYPE(nlh->nlmsg_type),
1985 sock_net(skb->sk));
1986 if (err <= 0)
1987 goto free;
1988
1989 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1990 if (err < 0)
1991 goto out;
1992
1993 return 0;
1994
1995 free:
1996 kfree_skb(skb2);
1997 out:
1998 /* this avoids a loop in nfnetlink. */
1999 return err == -EAGAIN ? -ENOBUFS : err;
2000 }
2001
2002 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2003 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2004 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2005 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2006 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2007 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2008 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2009 .len = NF_CT_HELPER_NAME_LEN - 1 },
2010 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2011 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2012 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2013 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2014 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2015 };
2016
2017 static struct nf_conntrack_expect *
2018 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2019 struct nf_conntrack_helper *helper,
2020 struct nf_conntrack_tuple *tuple,
2021 struct nf_conntrack_tuple *mask);
2022
2023 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
2024 static size_t
2025 ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
2026 {
2027 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2028 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2029 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2030 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2031 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2032 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2033 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2034 + nla_total_size(0) /* CTA_PROTOINFO */
2035 + nla_total_size(0) /* CTA_HELP */
2036 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2037 + ctnetlink_secctx_size(ct)
2038 #ifdef CONFIG_NF_NAT_NEEDED
2039 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2040 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2041 #endif
2042 #ifdef CONFIG_NF_CONNTRACK_MARK
2043 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2044 #endif
2045 #ifdef CONFIG_NF_CONNTRACK_ZONES
2046 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE */
2047 #endif
2048 + ctnetlink_proto_size(ct)
2049 ;
2050 }
2051
2052 static int
2053 ctnetlink_nfqueue_build(struct sk_buff *skb, struct nf_conn *ct)
2054 {
2055 struct nlattr *nest_parms;
2056
2057 rcu_read_lock();
2058 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2059 if (!nest_parms)
2060 goto nla_put_failure;
2061 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2062 goto nla_put_failure;
2063 nla_nest_end(skb, nest_parms);
2064
2065 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2066 if (!nest_parms)
2067 goto nla_put_failure;
2068 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2069 goto nla_put_failure;
2070 nla_nest_end(skb, nest_parms);
2071
2072 if (nf_ct_zone(ct)) {
2073 if (nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
2074 goto nla_put_failure;
2075 }
2076
2077 if (ctnetlink_dump_id(skb, ct) < 0)
2078 goto nla_put_failure;
2079
2080 if (ctnetlink_dump_status(skb, ct) < 0)
2081 goto nla_put_failure;
2082
2083 if (ctnetlink_dump_timeout(skb, ct) < 0)
2084 goto nla_put_failure;
2085
2086 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2087 goto nla_put_failure;
2088
2089 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2090 goto nla_put_failure;
2091
2092 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2093 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2094 goto nla_put_failure;
2095 #endif
2096 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2097 goto nla_put_failure;
2098
2099 if ((ct->status & IPS_SEQ_ADJUST) &&
2100 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2101 goto nla_put_failure;
2102
2103 #ifdef CONFIG_NF_CONNTRACK_MARK
2104 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2105 goto nla_put_failure;
2106 #endif
2107 if (ctnetlink_dump_labels(skb, ct) < 0)
2108 goto nla_put_failure;
2109 rcu_read_unlock();
2110 return 0;
2111
2112 nla_put_failure:
2113 rcu_read_unlock();
2114 return -ENOSPC;
2115 }
2116
2117 static int
2118 ctnetlink_nfqueue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2119 {
2120 int err;
2121
2122 if (cda[CTA_TIMEOUT]) {
2123 err = ctnetlink_change_timeout(ct, cda);
2124 if (err < 0)
2125 return err;
2126 }
2127 if (cda[CTA_STATUS]) {
2128 err = ctnetlink_change_status(ct, cda);
2129 if (err < 0)
2130 return err;
2131 }
2132 if (cda[CTA_HELP]) {
2133 err = ctnetlink_change_helper(ct, cda);
2134 if (err < 0)
2135 return err;
2136 }
2137 if (cda[CTA_LABELS]) {
2138 err = ctnetlink_attach_labels(ct, cda);
2139 if (err < 0)
2140 return err;
2141 }
2142 #if defined(CONFIG_NF_CONNTRACK_MARK)
2143 if (cda[CTA_MARK]) {
2144 u32 mask = 0, mark, newmark;
2145 if (cda[CTA_MARK_MASK])
2146 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2147
2148 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2149 newmark = (ct->mark & mask) ^ mark;
2150 if (newmark != ct->mark)
2151 ct->mark = newmark;
2152 }
2153 #endif
2154 return 0;
2155 }
2156
2157 static int
2158 ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
2159 {
2160 struct nlattr *cda[CTA_MAX+1];
2161 int ret;
2162
2163 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2164 if (ret < 0)
2165 return ret;
2166
2167 spin_lock_bh(&nf_conntrack_expect_lock);
2168 ret = ctnetlink_nfqueue_parse_ct((const struct nlattr **)cda, ct);
2169 spin_unlock_bh(&nf_conntrack_expect_lock);
2170
2171 return ret;
2172 }
2173
2174 static int ctnetlink_nfqueue_exp_parse(const struct nlattr * const *cda,
2175 const struct nf_conn *ct,
2176 struct nf_conntrack_tuple *tuple,
2177 struct nf_conntrack_tuple *mask)
2178 {
2179 int err;
2180
2181 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2182 nf_ct_l3num(ct));
2183 if (err < 0)
2184 return err;
2185
2186 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2187 nf_ct_l3num(ct));
2188 }
2189
2190 static int
2191 ctnetlink_nfqueue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2192 u32 portid, u32 report)
2193 {
2194 struct nlattr *cda[CTA_EXPECT_MAX+1];
2195 struct nf_conntrack_tuple tuple, mask;
2196 struct nf_conntrack_helper *helper = NULL;
2197 struct nf_conntrack_expect *exp;
2198 int err;
2199
2200 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2201 if (err < 0)
2202 return err;
2203
2204 err = ctnetlink_nfqueue_exp_parse((const struct nlattr * const *)cda,
2205 ct, &tuple, &mask);
2206 if (err < 0)
2207 return err;
2208
2209 if (cda[CTA_EXPECT_HELP_NAME]) {
2210 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2211
2212 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2213 nf_ct_protonum(ct));
2214 if (helper == NULL)
2215 return -EOPNOTSUPP;
2216 }
2217
2218 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2219 helper, &tuple, &mask);
2220 if (IS_ERR(exp))
2221 return PTR_ERR(exp);
2222
2223 err = nf_ct_expect_related_report(exp, portid, report);
2224 if (err < 0) {
2225 nf_ct_expect_put(exp);
2226 return err;
2227 }
2228
2229 return 0;
2230 }
2231
2232 static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
2233 .build_size = ctnetlink_nfqueue_build_size,
2234 .build = ctnetlink_nfqueue_build,
2235 .parse = ctnetlink_nfqueue_parse,
2236 .attach_expect = ctnetlink_nfqueue_attach_expect,
2237 .seq_adjust = nf_ct_tcp_seqadj_set,
2238 };
2239 #endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
2240
2241 /***********************************************************************
2242 * EXPECT
2243 ***********************************************************************/
2244
2245 static inline int
2246 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2247 const struct nf_conntrack_tuple *tuple,
2248 enum ctattr_expect type)
2249 {
2250 struct nlattr *nest_parms;
2251
2252 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2253 if (!nest_parms)
2254 goto nla_put_failure;
2255 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2256 goto nla_put_failure;
2257 nla_nest_end(skb, nest_parms);
2258
2259 return 0;
2260
2261 nla_put_failure:
2262 return -1;
2263 }
2264
2265 static inline int
2266 ctnetlink_exp_dump_mask(struct sk_buff *skb,
2267 const struct nf_conntrack_tuple *tuple,
2268 const struct nf_conntrack_tuple_mask *mask)
2269 {
2270 int ret;
2271 struct nf_conntrack_l3proto *l3proto;
2272 struct nf_conntrack_l4proto *l4proto;
2273 struct nf_conntrack_tuple m;
2274 struct nlattr *nest_parms;
2275
2276 memset(&m, 0xFF, sizeof(m));
2277 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2278 m.src.u.all = mask->src.u.all;
2279 m.dst.protonum = tuple->dst.protonum;
2280
2281 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2282 if (!nest_parms)
2283 goto nla_put_failure;
2284
2285 rcu_read_lock();
2286 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2287 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2288 if (ret >= 0) {
2289 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2290 tuple->dst.protonum);
2291 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2292 }
2293 rcu_read_unlock();
2294
2295 if (unlikely(ret < 0))
2296 goto nla_put_failure;
2297
2298 nla_nest_end(skb, nest_parms);
2299
2300 return 0;
2301
2302 nla_put_failure:
2303 return -1;
2304 }
2305
2306 static const union nf_inet_addr any_addr;
2307
2308 static int
2309 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2310 const struct nf_conntrack_expect *exp)
2311 {
2312 struct nf_conn *master = exp->master;
2313 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2314 struct nf_conn_help *help;
2315 #ifdef CONFIG_NF_NAT_NEEDED
2316 struct nlattr *nest_parms;
2317 struct nf_conntrack_tuple nat_tuple = {};
2318 #endif
2319 struct nf_ct_helper_expectfn *expfn;
2320
2321 if (timeout < 0)
2322 timeout = 0;
2323
2324 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2325 goto nla_put_failure;
2326 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2327 goto nla_put_failure;
2328 if (ctnetlink_exp_dump_tuple(skb,
2329 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2330 CTA_EXPECT_MASTER) < 0)
2331 goto nla_put_failure;
2332
2333 #ifdef CONFIG_NF_NAT_NEEDED
2334 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2335 exp->saved_proto.all) {
2336 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2337 if (!nest_parms)
2338 goto nla_put_failure;
2339
2340 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2341 goto nla_put_failure;
2342
2343 nat_tuple.src.l3num = nf_ct_l3num(master);
2344 nat_tuple.src.u3 = exp->saved_addr;
2345 nat_tuple.dst.protonum = nf_ct_protonum(master);
2346 nat_tuple.src.u = exp->saved_proto;
2347
2348 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2349 CTA_EXPECT_NAT_TUPLE) < 0)
2350 goto nla_put_failure;
2351 nla_nest_end(skb, nest_parms);
2352 }
2353 #endif
2354 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2355 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2356 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2357 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2358 goto nla_put_failure;
2359 help = nfct_help(master);
2360 if (help) {
2361 struct nf_conntrack_helper *helper;
2362
2363 helper = rcu_dereference(help->helper);
2364 if (helper &&
2365 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2366 goto nla_put_failure;
2367 }
2368 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2369 if (expfn != NULL &&
2370 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2371 goto nla_put_failure;
2372
2373 return 0;
2374
2375 nla_put_failure:
2376 return -1;
2377 }
2378
2379 static int
2380 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2381 int event, const struct nf_conntrack_expect *exp)
2382 {
2383 struct nlmsghdr *nlh;
2384 struct nfgenmsg *nfmsg;
2385 unsigned int flags = portid ? NLM_F_MULTI : 0;
2386
2387 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2388 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2389 if (nlh == NULL)
2390 goto nlmsg_failure;
2391
2392 nfmsg = nlmsg_data(nlh);
2393 nfmsg->nfgen_family = exp->tuple.src.l3num;
2394 nfmsg->version = NFNETLINK_V0;
2395 nfmsg->res_id = 0;
2396
2397 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2398 goto nla_put_failure;
2399
2400 nlmsg_end(skb, nlh);
2401 return skb->len;
2402
2403 nlmsg_failure:
2404 nla_put_failure:
2405 nlmsg_cancel(skb, nlh);
2406 return -1;
2407 }
2408
2409 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2410 static int
2411 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2412 {
2413 struct nf_conntrack_expect *exp = item->exp;
2414 struct net *net = nf_ct_exp_net(exp);
2415 struct nlmsghdr *nlh;
2416 struct nfgenmsg *nfmsg;
2417 struct sk_buff *skb;
2418 unsigned int type, group;
2419 int flags = 0;
2420
2421 if (events & (1 << IPEXP_DESTROY)) {
2422 type = IPCTNL_MSG_EXP_DELETE;
2423 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2424 } else if (events & (1 << IPEXP_NEW)) {
2425 type = IPCTNL_MSG_EXP_NEW;
2426 flags = NLM_F_CREATE|NLM_F_EXCL;
2427 group = NFNLGRP_CONNTRACK_EXP_NEW;
2428 } else
2429 return 0;
2430
2431 if (!item->report && !nfnetlink_has_listeners(net, group))
2432 return 0;
2433
2434 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2435 if (skb == NULL)
2436 goto errout;
2437
2438 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2439 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2440 if (nlh == NULL)
2441 goto nlmsg_failure;
2442
2443 nfmsg = nlmsg_data(nlh);
2444 nfmsg->nfgen_family = exp->tuple.src.l3num;
2445 nfmsg->version = NFNETLINK_V0;
2446 nfmsg->res_id = 0;
2447
2448 rcu_read_lock();
2449 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2450 goto nla_put_failure;
2451 rcu_read_unlock();
2452
2453 nlmsg_end(skb, nlh);
2454 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2455 return 0;
2456
2457 nla_put_failure:
2458 rcu_read_unlock();
2459 nlmsg_cancel(skb, nlh);
2460 nlmsg_failure:
2461 kfree_skb(skb);
2462 errout:
2463 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2464 return 0;
2465 }
2466 #endif
2467 static int ctnetlink_exp_done(struct netlink_callback *cb)
2468 {
2469 if (cb->args[1])
2470 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2471 return 0;
2472 }
2473
2474 static int
2475 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2476 {
2477 struct net *net = sock_net(skb->sk);
2478 struct nf_conntrack_expect *exp, *last;
2479 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2480 u_int8_t l3proto = nfmsg->nfgen_family;
2481
2482 rcu_read_lock();
2483 last = (struct nf_conntrack_expect *)cb->args[1];
2484 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2485 restart:
2486 hlist_for_each_entry(exp, &net->ct.expect_hash[cb->args[0]],
2487 hnode) {
2488 if (l3proto && exp->tuple.src.l3num != l3proto)
2489 continue;
2490 if (cb->args[1]) {
2491 if (exp != last)
2492 continue;
2493 cb->args[1] = 0;
2494 }
2495 if (ctnetlink_exp_fill_info(skb,
2496 NETLINK_CB(cb->skb).portid,
2497 cb->nlh->nlmsg_seq,
2498 IPCTNL_MSG_EXP_NEW,
2499 exp) < 0) {
2500 if (!atomic_inc_not_zero(&exp->use))
2501 continue;
2502 cb->args[1] = (unsigned long)exp;
2503 goto out;
2504 }
2505 }
2506 if (cb->args[1]) {
2507 cb->args[1] = 0;
2508 goto restart;
2509 }
2510 }
2511 out:
2512 rcu_read_unlock();
2513 if (last)
2514 nf_ct_expect_put(last);
2515
2516 return skb->len;
2517 }
2518
2519 static int
2520 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2521 {
2522 struct nf_conntrack_expect *exp, *last;
2523 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2524 struct nf_conn *ct = cb->data;
2525 struct nf_conn_help *help = nfct_help(ct);
2526 u_int8_t l3proto = nfmsg->nfgen_family;
2527
2528 if (cb->args[0])
2529 return 0;
2530
2531 rcu_read_lock();
2532 last = (struct nf_conntrack_expect *)cb->args[1];
2533 restart:
2534 hlist_for_each_entry(exp, &help->expectations, lnode) {
2535 if (l3proto && exp->tuple.src.l3num != l3proto)
2536 continue;
2537 if (cb->args[1]) {
2538 if (exp != last)
2539 continue;
2540 cb->args[1] = 0;
2541 }
2542 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2543 cb->nlh->nlmsg_seq,
2544 IPCTNL_MSG_EXP_NEW,
2545 exp) < 0) {
2546 if (!atomic_inc_not_zero(&exp->use))
2547 continue;
2548 cb->args[1] = (unsigned long)exp;
2549 goto out;
2550 }
2551 }
2552 if (cb->args[1]) {
2553 cb->args[1] = 0;
2554 goto restart;
2555 }
2556 cb->args[0] = 1;
2557 out:
2558 rcu_read_unlock();
2559 if (last)
2560 nf_ct_expect_put(last);
2561
2562 return skb->len;
2563 }
2564
2565 static int ctnetlink_dump_exp_ct(struct sock *ctnl, struct sk_buff *skb,
2566 const struct nlmsghdr *nlh,
2567 const struct nlattr * const cda[])
2568 {
2569 int err;
2570 struct net *net = sock_net(ctnl);
2571 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2572 u_int8_t u3 = nfmsg->nfgen_family;
2573 struct nf_conntrack_tuple tuple;
2574 struct nf_conntrack_tuple_hash *h;
2575 struct nf_conn *ct;
2576 u16 zone = 0;
2577 struct netlink_dump_control c = {
2578 .dump = ctnetlink_exp_ct_dump_table,
2579 .done = ctnetlink_exp_done,
2580 };
2581
2582 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2583 if (err < 0)
2584 return err;
2585
2586 if (cda[CTA_EXPECT_ZONE]) {
2587 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2588 if (err < 0)
2589 return err;
2590 }
2591
2592 h = nf_conntrack_find_get(net, zone, &tuple);
2593 if (!h)
2594 return -ENOENT;
2595
2596 ct = nf_ct_tuplehash_to_ctrack(h);
2597 c.data = ct;
2598
2599 err = netlink_dump_start(ctnl, skb, nlh, &c);
2600 nf_ct_put(ct);
2601
2602 return err;
2603 }
2604
2605 static int
2606 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
2607 const struct nlmsghdr *nlh,
2608 const struct nlattr * const cda[])
2609 {
2610 struct net *net = sock_net(ctnl);
2611 struct nf_conntrack_tuple tuple;
2612 struct nf_conntrack_expect *exp;
2613 struct sk_buff *skb2;
2614 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2615 u_int8_t u3 = nfmsg->nfgen_family;
2616 u16 zone;
2617 int err;
2618
2619 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2620 if (cda[CTA_EXPECT_MASTER])
2621 return ctnetlink_dump_exp_ct(ctnl, skb, nlh, cda);
2622 else {
2623 struct netlink_dump_control c = {
2624 .dump = ctnetlink_exp_dump_table,
2625 .done = ctnetlink_exp_done,
2626 };
2627 return netlink_dump_start(ctnl, skb, nlh, &c);
2628 }
2629 }
2630
2631 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2632 if (err < 0)
2633 return err;
2634
2635 if (cda[CTA_EXPECT_TUPLE])
2636 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2637 else if (cda[CTA_EXPECT_MASTER])
2638 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2639 else
2640 return -EINVAL;
2641
2642 if (err < 0)
2643 return err;
2644
2645 exp = nf_ct_expect_find_get(net, zone, &tuple);
2646 if (!exp)
2647 return -ENOENT;
2648
2649 if (cda[CTA_EXPECT_ID]) {
2650 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2651 if (ntohl(id) != (u32)(unsigned long)exp) {
2652 nf_ct_expect_put(exp);
2653 return -ENOENT;
2654 }
2655 }
2656
2657 err = -ENOMEM;
2658 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2659 if (skb2 == NULL) {
2660 nf_ct_expect_put(exp);
2661 goto out;
2662 }
2663
2664 rcu_read_lock();
2665 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2666 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2667 rcu_read_unlock();
2668 nf_ct_expect_put(exp);
2669 if (err <= 0)
2670 goto free;
2671
2672 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2673 if (err < 0)
2674 goto out;
2675
2676 return 0;
2677
2678 free:
2679 kfree_skb(skb2);
2680 out:
2681 /* this avoids a loop in nfnetlink. */
2682 return err == -EAGAIN ? -ENOBUFS : err;
2683 }
2684
2685 static int
2686 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
2687 const struct nlmsghdr *nlh,
2688 const struct nlattr * const cda[])
2689 {
2690 struct net *net = sock_net(ctnl);
2691 struct nf_conntrack_expect *exp;
2692 struct nf_conntrack_tuple tuple;
2693 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2694 struct hlist_node *next;
2695 u_int8_t u3 = nfmsg->nfgen_family;
2696 unsigned int i;
2697 u16 zone;
2698 int err;
2699
2700 if (cda[CTA_EXPECT_TUPLE]) {
2701 /* delete a single expect by tuple */
2702 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2703 if (err < 0)
2704 return err;
2705
2706 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2707 if (err < 0)
2708 return err;
2709
2710 /* bump usage count to 2 */
2711 exp = nf_ct_expect_find_get(net, zone, &tuple);
2712 if (!exp)
2713 return -ENOENT;
2714
2715 if (cda[CTA_EXPECT_ID]) {
2716 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2717 if (ntohl(id) != (u32)(unsigned long)exp) {
2718 nf_ct_expect_put(exp);
2719 return -ENOENT;
2720 }
2721 }
2722
2723 /* after list removal, usage count == 1 */
2724 spin_lock_bh(&nf_conntrack_expect_lock);
2725 if (del_timer(&exp->timeout)) {
2726 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2727 nlmsg_report(nlh));
2728 nf_ct_expect_put(exp);
2729 }
2730 spin_unlock_bh(&nf_conntrack_expect_lock);
2731 /* have to put what we 'get' above.
2732 * after this line usage count == 0 */
2733 nf_ct_expect_put(exp);
2734 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2735 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2736 struct nf_conn_help *m_help;
2737
2738 /* delete all expectations for this helper */
2739 spin_lock_bh(&nf_conntrack_expect_lock);
2740 for (i = 0; i < nf_ct_expect_hsize; i++) {
2741 hlist_for_each_entry_safe(exp, next,
2742 &net->ct.expect_hash[i],
2743 hnode) {
2744 m_help = nfct_help(exp->master);
2745 if (!strcmp(m_help->helper->name, name) &&
2746 del_timer(&exp->timeout)) {
2747 nf_ct_unlink_expect_report(exp,
2748 NETLINK_CB(skb).portid,
2749 nlmsg_report(nlh));
2750 nf_ct_expect_put(exp);
2751 }
2752 }
2753 }
2754 spin_unlock_bh(&nf_conntrack_expect_lock);
2755 } else {
2756 /* This basically means we have to flush everything*/
2757 spin_lock_bh(&nf_conntrack_expect_lock);
2758 for (i = 0; i < nf_ct_expect_hsize; i++) {
2759 hlist_for_each_entry_safe(exp, next,
2760 &net->ct.expect_hash[i],
2761 hnode) {
2762 if (del_timer(&exp->timeout)) {
2763 nf_ct_unlink_expect_report(exp,
2764 NETLINK_CB(skb).portid,
2765 nlmsg_report(nlh));
2766 nf_ct_expect_put(exp);
2767 }
2768 }
2769 }
2770 spin_unlock_bh(&nf_conntrack_expect_lock);
2771 }
2772
2773 return 0;
2774 }
2775 static int
2776 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2777 const struct nlattr * const cda[])
2778 {
2779 if (cda[CTA_EXPECT_TIMEOUT]) {
2780 if (!del_timer(&x->timeout))
2781 return -ETIME;
2782
2783 x->timeout.expires = jiffies +
2784 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2785 add_timer(&x->timeout);
2786 }
2787 return 0;
2788 }
2789
2790 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2791 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2792 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2793 };
2794
2795 static int
2796 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2797 struct nf_conntrack_expect *exp,
2798 u_int8_t u3)
2799 {
2800 #ifdef CONFIG_NF_NAT_NEEDED
2801 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2802 struct nf_conntrack_tuple nat_tuple = {};
2803 int err;
2804
2805 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2806 if (err < 0)
2807 return err;
2808
2809 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2810 return -EINVAL;
2811
2812 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2813 &nat_tuple, CTA_EXPECT_NAT_TUPLE, u3);
2814 if (err < 0)
2815 return err;
2816
2817 exp->saved_addr = nat_tuple.src.u3;
2818 exp->saved_proto = nat_tuple.src.u;
2819 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2820
2821 return 0;
2822 #else
2823 return -EOPNOTSUPP;
2824 #endif
2825 }
2826
2827 static struct nf_conntrack_expect *
2828 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
2829 struct nf_conntrack_helper *helper,
2830 struct nf_conntrack_tuple *tuple,
2831 struct nf_conntrack_tuple *mask)
2832 {
2833 u_int32_t class = 0;
2834 struct nf_conntrack_expect *exp;
2835 struct nf_conn_help *help;
2836 int err;
2837
2838 if (cda[CTA_EXPECT_CLASS] && helper) {
2839 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
2840 if (class > helper->expect_class_max)
2841 return ERR_PTR(-EINVAL);
2842 }
2843 exp = nf_ct_expect_alloc(ct);
2844 if (!exp)
2845 return ERR_PTR(-ENOMEM);
2846
2847 help = nfct_help(ct);
2848 if (!help) {
2849 if (!cda[CTA_EXPECT_TIMEOUT]) {
2850 err = -EINVAL;
2851 goto err_out;
2852 }
2853 exp->timeout.expires =
2854 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2855
2856 exp->flags = NF_CT_EXPECT_USERSPACE;
2857 if (cda[CTA_EXPECT_FLAGS]) {
2858 exp->flags |=
2859 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2860 }
2861 } else {
2862 if (cda[CTA_EXPECT_FLAGS]) {
2863 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2864 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2865 } else
2866 exp->flags = 0;
2867 }
2868 if (cda[CTA_EXPECT_FN]) {
2869 const char *name = nla_data(cda[CTA_EXPECT_FN]);
2870 struct nf_ct_helper_expectfn *expfn;
2871
2872 expfn = nf_ct_helper_expectfn_find_by_name(name);
2873 if (expfn == NULL) {
2874 err = -EINVAL;
2875 goto err_out;
2876 }
2877 exp->expectfn = expfn->expectfn;
2878 } else
2879 exp->expectfn = NULL;
2880
2881 exp->class = class;
2882 exp->master = ct;
2883 exp->helper = helper;
2884 exp->tuple = *tuple;
2885 exp->mask.src.u3 = mask->src.u3;
2886 exp->mask.src.u.all = mask->src.u.all;
2887
2888 if (cda[CTA_EXPECT_NAT]) {
2889 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
2890 exp, nf_ct_l3num(ct));
2891 if (err < 0)
2892 goto err_out;
2893 }
2894 return exp;
2895 err_out:
2896 nf_ct_expect_put(exp);
2897 return ERR_PTR(err);
2898 }
2899
2900 static int
2901 ctnetlink_create_expect(struct net *net, u16 zone,
2902 const struct nlattr * const cda[],
2903 u_int8_t u3, u32 portid, int report)
2904 {
2905 struct nf_conntrack_tuple tuple, mask, master_tuple;
2906 struct nf_conntrack_tuple_hash *h = NULL;
2907 struct nf_conntrack_helper *helper = NULL;
2908 struct nf_conntrack_expect *exp;
2909 struct nf_conn *ct;
2910 int err;
2911
2912 /* caller guarantees that those three CTA_EXPECT_* exist */
2913 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2914 if (err < 0)
2915 return err;
2916 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2917 if (err < 0)
2918 return err;
2919 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2920 if (err < 0)
2921 return err;
2922
2923 /* Look for master conntrack of this expectation */
2924 h = nf_conntrack_find_get(net, zone, &master_tuple);
2925 if (!h)
2926 return -ENOENT;
2927 ct = nf_ct_tuplehash_to_ctrack(h);
2928
2929 if (cda[CTA_EXPECT_HELP_NAME]) {
2930 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2931
2932 helper = __nf_conntrack_helper_find(helpname, u3,
2933 nf_ct_protonum(ct));
2934 if (helper == NULL) {
2935 #ifdef CONFIG_MODULES
2936 if (request_module("nfct-helper-%s", helpname) < 0) {
2937 err = -EOPNOTSUPP;
2938 goto err_ct;
2939 }
2940 helper = __nf_conntrack_helper_find(helpname, u3,
2941 nf_ct_protonum(ct));
2942 if (helper) {
2943 err = -EAGAIN;
2944 goto err_ct;
2945 }
2946 #endif
2947 err = -EOPNOTSUPP;
2948 goto err_ct;
2949 }
2950 }
2951
2952 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
2953 if (IS_ERR(exp)) {
2954 err = PTR_ERR(exp);
2955 goto err_ct;
2956 }
2957
2958 err = nf_ct_expect_related_report(exp, portid, report);
2959 if (err < 0)
2960 goto err_exp;
2961
2962 return 0;
2963 err_exp:
2964 nf_ct_expect_put(exp);
2965 err_ct:
2966 nf_ct_put(ct);
2967 return err;
2968 }
2969
2970 static int
2971 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2972 const struct nlmsghdr *nlh,
2973 const struct nlattr * const cda[])
2974 {
2975 struct net *net = sock_net(ctnl);
2976 struct nf_conntrack_tuple tuple;
2977 struct nf_conntrack_expect *exp;
2978 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2979 u_int8_t u3 = nfmsg->nfgen_family;
2980 u16 zone;
2981 int err;
2982
2983 if (!cda[CTA_EXPECT_TUPLE]
2984 || !cda[CTA_EXPECT_MASK]
2985 || !cda[CTA_EXPECT_MASTER])
2986 return -EINVAL;
2987
2988 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2989 if (err < 0)
2990 return err;
2991
2992 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2993 if (err < 0)
2994 return err;
2995
2996 spin_lock_bh(&nf_conntrack_expect_lock);
2997 exp = __nf_ct_expect_find(net, zone, &tuple);
2998
2999 if (!exp) {
3000 spin_unlock_bh(&nf_conntrack_expect_lock);
3001 err = -ENOENT;
3002 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3003 err = ctnetlink_create_expect(net, zone, cda,
3004 u3,
3005 NETLINK_CB(skb).portid,
3006 nlmsg_report(nlh));
3007 }
3008 return err;
3009 }
3010
3011 err = -EEXIST;
3012 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3013 err = ctnetlink_change_expect(exp, cda);
3014 spin_unlock_bh(&nf_conntrack_expect_lock);
3015
3016 return err;
3017 }
3018
3019 static int
3020 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3021 const struct ip_conntrack_stat *st)
3022 {
3023 struct nlmsghdr *nlh;
3024 struct nfgenmsg *nfmsg;
3025 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3026
3027 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
3028 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3029 if (nlh == NULL)
3030 goto nlmsg_failure;
3031
3032 nfmsg = nlmsg_data(nlh);
3033 nfmsg->nfgen_family = AF_UNSPEC;
3034 nfmsg->version = NFNETLINK_V0;
3035 nfmsg->res_id = htons(cpu);
3036
3037 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3038 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3039 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3040 goto nla_put_failure;
3041
3042 nlmsg_end(skb, nlh);
3043 return skb->len;
3044
3045 nla_put_failure:
3046 nlmsg_failure:
3047 nlmsg_cancel(skb, nlh);
3048 return -1;
3049 }
3050
3051 static int
3052 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3053 {
3054 int cpu;
3055 struct net *net = sock_net(skb->sk);
3056
3057 if (cb->args[0] == nr_cpu_ids)
3058 return 0;
3059
3060 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3061 const struct ip_conntrack_stat *st;
3062
3063 if (!cpu_possible(cpu))
3064 continue;
3065
3066 st = per_cpu_ptr(net->ct.stat, cpu);
3067 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3068 cb->nlh->nlmsg_seq,
3069 cpu, st) < 0)
3070 break;
3071 }
3072 cb->args[0] = cpu;
3073
3074 return skb->len;
3075 }
3076
3077 static int
3078 ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
3079 const struct nlmsghdr *nlh,
3080 const struct nlattr * const cda[])
3081 {
3082 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3083 struct netlink_dump_control c = {
3084 .dump = ctnetlink_exp_stat_cpu_dump,
3085 };
3086 return netlink_dump_start(ctnl, skb, nlh, &c);
3087 }
3088
3089 return 0;
3090 }
3091
3092 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3093 static struct nf_ct_event_notifier ctnl_notifier = {
3094 .fcn = ctnetlink_conntrack_event,
3095 };
3096
3097 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3098 .fcn = ctnetlink_expect_event,
3099 };
3100 #endif
3101
3102 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3103 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3104 .attr_count = CTA_MAX,
3105 .policy = ct_nla_policy },
3106 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3107 .attr_count = CTA_MAX,
3108 .policy = ct_nla_policy },
3109 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3110 .attr_count = CTA_MAX,
3111 .policy = ct_nla_policy },
3112 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3113 .attr_count = CTA_MAX,
3114 .policy = ct_nla_policy },
3115 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3116 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3117 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3118 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3119 };
3120
3121 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3122 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3123 .attr_count = CTA_EXPECT_MAX,
3124 .policy = exp_nla_policy },
3125 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3126 .attr_count = CTA_EXPECT_MAX,
3127 .policy = exp_nla_policy },
3128 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3129 .attr_count = CTA_EXPECT_MAX,
3130 .policy = exp_nla_policy },
3131 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3132 };
3133
3134 static const struct nfnetlink_subsystem ctnl_subsys = {
3135 .name = "conntrack",
3136 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3137 .cb_count = IPCTNL_MSG_MAX,
3138 .cb = ctnl_cb,
3139 };
3140
3141 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3142 .name = "conntrack_expect",
3143 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3144 .cb_count = IPCTNL_MSG_EXP_MAX,
3145 .cb = ctnl_exp_cb,
3146 };
3147
3148 MODULE_ALIAS("ip_conntrack_netlink");
3149 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3150 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3151
3152 static int __net_init ctnetlink_net_init(struct net *net)
3153 {
3154 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3155 int ret;
3156
3157 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3158 if (ret < 0) {
3159 pr_err("ctnetlink_init: cannot register notifier.\n");
3160 goto err_out;
3161 }
3162
3163 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3164 if (ret < 0) {
3165 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3166 goto err_unreg_notifier;
3167 }
3168 #endif
3169 return 0;
3170
3171 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3172 err_unreg_notifier:
3173 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3174 err_out:
3175 return ret;
3176 #endif
3177 }
3178
3179 static void ctnetlink_net_exit(struct net *net)
3180 {
3181 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3182 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3183 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3184 #endif
3185 }
3186
3187 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3188 {
3189 struct net *net;
3190
3191 list_for_each_entry(net, net_exit_list, exit_list)
3192 ctnetlink_net_exit(net);
3193 }
3194
3195 static struct pernet_operations ctnetlink_net_ops = {
3196 .init = ctnetlink_net_init,
3197 .exit_batch = ctnetlink_net_exit_batch,
3198 };
3199
3200 static int __init ctnetlink_init(void)
3201 {
3202 int ret;
3203
3204 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3205 ret = nfnetlink_subsys_register(&ctnl_subsys);
3206 if (ret < 0) {
3207 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3208 goto err_out;
3209 }
3210
3211 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3212 if (ret < 0) {
3213 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3214 goto err_unreg_subsys;
3215 }
3216
3217 ret = register_pernet_subsys(&ctnetlink_net_ops);
3218 if (ret < 0) {
3219 pr_err("ctnetlink_init: cannot register pernet operations\n");
3220 goto err_unreg_exp_subsys;
3221 }
3222 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3223 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3224 RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
3225 #endif
3226 return 0;
3227
3228 err_unreg_exp_subsys:
3229 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3230 err_unreg_subsys:
3231 nfnetlink_subsys_unregister(&ctnl_subsys);
3232 err_out:
3233 return ret;
3234 }
3235
3236 static void __exit ctnetlink_exit(void)
3237 {
3238 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3239
3240 unregister_pernet_subsys(&ctnetlink_net_ops);
3241 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3242 nfnetlink_subsys_unregister(&ctnl_subsys);
3243 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3244 RCU_INIT_POINTER(nfq_ct_hook, NULL);
3245 #endif
3246 }
3247
3248 module_init(ctnetlink_init);
3249 module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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