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Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux...
[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_l3proto.h>
41 #include <net/netfilter/nf_conntrack_l4proto.h>
42 #include <net/netfilter/nf_conntrack_tuple.h>
43 #include <net/netfilter/nf_conntrack_acct.h>
44 #include <net/netfilter/nf_conntrack_zones.h>
45 #include <net/netfilter/nf_conntrack_timestamp.h>
46 #include <net/netfilter/nf_conntrack_labels.h>
47 #ifdef CONFIG_NF_NAT_NEEDED
48 #include <net/netfilter/nf_nat_core.h>
49 #include <net/netfilter/nf_nat_l4proto.h>
50 #include <net/netfilter/nf_nat_helper.h>
51 #endif
52
53 #include <linux/netfilter/nfnetlink.h>
54 #include <linux/netfilter/nfnetlink_conntrack.h>
55
56 MODULE_LICENSE("GPL");
57
58 static char __initdata version[] = "0.93";
59
60 static inline int
61 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
62 const struct nf_conntrack_tuple *tuple,
63 struct nf_conntrack_l4proto *l4proto)
64 {
65 int ret = 0;
66 struct nlattr *nest_parms;
67
68 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
69 if (!nest_parms)
70 goto nla_put_failure;
71 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
72 goto nla_put_failure;
73
74 if (likely(l4proto->tuple_to_nlattr))
75 ret = l4proto->tuple_to_nlattr(skb, tuple);
76
77 nla_nest_end(skb, nest_parms);
78
79 return ret;
80
81 nla_put_failure:
82 return -1;
83 }
84
85 static inline int
86 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
87 const struct nf_conntrack_tuple *tuple,
88 struct nf_conntrack_l3proto *l3proto)
89 {
90 int ret = 0;
91 struct nlattr *nest_parms;
92
93 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
94 if (!nest_parms)
95 goto nla_put_failure;
96
97 if (likely(l3proto->tuple_to_nlattr))
98 ret = l3proto->tuple_to_nlattr(skb, tuple);
99
100 nla_nest_end(skb, nest_parms);
101
102 return ret;
103
104 nla_put_failure:
105 return -1;
106 }
107
108 static int
109 ctnetlink_dump_tuples(struct sk_buff *skb,
110 const struct nf_conntrack_tuple *tuple)
111 {
112 int ret;
113 struct nf_conntrack_l3proto *l3proto;
114 struct nf_conntrack_l4proto *l4proto;
115
116 rcu_read_lock();
117 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
118 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
119
120 if (ret >= 0) {
121 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
122 tuple->dst.protonum);
123 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
124 }
125 rcu_read_unlock();
126 return ret;
127 }
128
129 static inline int
130 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
131 {
132 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
133 goto nla_put_failure;
134 return 0;
135
136 nla_put_failure:
137 return -1;
138 }
139
140 static inline int
141 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
142 {
143 long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
144
145 if (timeout < 0)
146 timeout = 0;
147
148 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
149 goto nla_put_failure;
150 return 0;
151
152 nla_put_failure:
153 return -1;
154 }
155
156 static inline int
157 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
158 {
159 struct nf_conntrack_l4proto *l4proto;
160 struct nlattr *nest_proto;
161 int ret;
162
163 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
164 if (!l4proto->to_nlattr)
165 return 0;
166
167 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
168 if (!nest_proto)
169 goto nla_put_failure;
170
171 ret = l4proto->to_nlattr(skb, nest_proto, ct);
172
173 nla_nest_end(skb, nest_proto);
174
175 return ret;
176
177 nla_put_failure:
178 return -1;
179 }
180
181 static inline int
182 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
183 {
184 struct nlattr *nest_helper;
185 const struct nf_conn_help *help = nfct_help(ct);
186 struct nf_conntrack_helper *helper;
187
188 if (!help)
189 return 0;
190
191 helper = rcu_dereference(help->helper);
192 if (!helper)
193 goto out;
194
195 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
196 if (!nest_helper)
197 goto nla_put_failure;
198 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
199 goto nla_put_failure;
200
201 if (helper->to_nlattr)
202 helper->to_nlattr(skb, ct);
203
204 nla_nest_end(skb, nest_helper);
205 out:
206 return 0;
207
208 nla_put_failure:
209 return -1;
210 }
211
212 static int
213 dump_counters(struct sk_buff *skb, u64 pkts, u64 bytes,
214 enum ip_conntrack_dir dir)
215 {
216 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
217 struct nlattr *nest_count;
218
219 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
220 if (!nest_count)
221 goto nla_put_failure;
222
223 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts)) ||
224 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes)))
225 goto nla_put_failure;
226
227 nla_nest_end(skb, nest_count);
228
229 return 0;
230
231 nla_put_failure:
232 return -1;
233 }
234
235 static int
236 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
237 enum ip_conntrack_dir dir, int type)
238 {
239 struct nf_conn_counter *acct;
240 u64 pkts, bytes;
241
242 acct = nf_conn_acct_find(ct);
243 if (!acct)
244 return 0;
245
246 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
247 pkts = atomic64_xchg(&acct[dir].packets, 0);
248 bytes = atomic64_xchg(&acct[dir].bytes, 0);
249 } else {
250 pkts = atomic64_read(&acct[dir].packets);
251 bytes = atomic64_read(&acct[dir].bytes);
252 }
253 return dump_counters(skb, pkts, bytes, dir);
254 }
255
256 static int
257 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
258 {
259 struct nlattr *nest_count;
260 const struct nf_conn_tstamp *tstamp;
261
262 tstamp = nf_conn_tstamp_find(ct);
263 if (!tstamp)
264 return 0;
265
266 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
267 if (!nest_count)
268 goto nla_put_failure;
269
270 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start)) ||
271 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
272 cpu_to_be64(tstamp->stop))))
273 goto nla_put_failure;
274 nla_nest_end(skb, nest_count);
275
276 return 0;
277
278 nla_put_failure:
279 return -1;
280 }
281
282 #ifdef CONFIG_NF_CONNTRACK_MARK
283 static inline int
284 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
285 {
286 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
287 goto nla_put_failure;
288 return 0;
289
290 nla_put_failure:
291 return -1;
292 }
293 #else
294 #define ctnetlink_dump_mark(a, b) (0)
295 #endif
296
297 #ifdef CONFIG_NF_CONNTRACK_SECMARK
298 static inline int
299 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
300 {
301 struct nlattr *nest_secctx;
302 int len, ret;
303 char *secctx;
304
305 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
306 if (ret)
307 return 0;
308
309 ret = -1;
310 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
311 if (!nest_secctx)
312 goto nla_put_failure;
313
314 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
315 goto nla_put_failure;
316 nla_nest_end(skb, nest_secctx);
317
318 ret = 0;
319 nla_put_failure:
320 security_release_secctx(secctx, len);
321 return ret;
322 }
323 #else
324 #define ctnetlink_dump_secctx(a, b) (0)
325 #endif
326
327 #ifdef CONFIG_NF_CONNTRACK_LABELS
328 static int ctnetlink_label_size(const struct nf_conn *ct)
329 {
330 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
331
332 if (!labels)
333 return 0;
334 return nla_total_size(labels->words * sizeof(long));
335 }
336
337 static int
338 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
339 {
340 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
341 unsigned int len, i;
342
343 if (!labels)
344 return 0;
345
346 len = labels->words * sizeof(long);
347 i = 0;
348 do {
349 if (labels->bits[i] != 0)
350 return nla_put(skb, CTA_LABELS, len, labels->bits);
351 i++;
352 } while (i < labels->words);
353
354 return 0;
355 }
356 #else
357 #define ctnetlink_dump_labels(a, b) (0)
358 #define ctnetlink_label_size(a) (0)
359 #endif
360
361 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
362
363 static inline int
364 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
365 {
366 struct nlattr *nest_parms;
367
368 if (!(ct->status & IPS_EXPECTED))
369 return 0;
370
371 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
372 if (!nest_parms)
373 goto nla_put_failure;
374 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
375 goto nla_put_failure;
376 nla_nest_end(skb, nest_parms);
377
378 return 0;
379
380 nla_put_failure:
381 return -1;
382 }
383
384 #ifdef CONFIG_NF_NAT_NEEDED
385 static int
386 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
387 {
388 struct nlattr *nest_parms;
389
390 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
391 if (!nest_parms)
392 goto nla_put_failure;
393
394 if (nla_put_be32(skb, CTA_NAT_SEQ_CORRECTION_POS,
395 htonl(natseq->correction_pos)) ||
396 nla_put_be32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
397 htonl(natseq->offset_before)) ||
398 nla_put_be32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
399 htonl(natseq->offset_after)))
400 goto nla_put_failure;
401
402 nla_nest_end(skb, nest_parms);
403
404 return 0;
405
406 nla_put_failure:
407 return -1;
408 }
409
410 static inline int
411 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
412 {
413 struct nf_nat_seq *natseq;
414 struct nf_conn_nat *nat = nfct_nat(ct);
415
416 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
417 return 0;
418
419 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
420 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
421 return -1;
422
423 natseq = &nat->seq[IP_CT_DIR_REPLY];
424 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
425 return -1;
426
427 return 0;
428 }
429 #else
430 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
431 #endif
432
433 static inline int
434 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
435 {
436 if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
437 goto nla_put_failure;
438 return 0;
439
440 nla_put_failure:
441 return -1;
442 }
443
444 static inline int
445 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
446 {
447 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
448 goto nla_put_failure;
449 return 0;
450
451 nla_put_failure:
452 return -1;
453 }
454
455 static int
456 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
457 struct nf_conn *ct)
458 {
459 struct nlmsghdr *nlh;
460 struct nfgenmsg *nfmsg;
461 struct nlattr *nest_parms;
462 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
463
464 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
465 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
466 if (nlh == NULL)
467 goto nlmsg_failure;
468
469 nfmsg = nlmsg_data(nlh);
470 nfmsg->nfgen_family = nf_ct_l3num(ct);
471 nfmsg->version = NFNETLINK_V0;
472 nfmsg->res_id = 0;
473
474 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
475 if (!nest_parms)
476 goto nla_put_failure;
477 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
478 goto nla_put_failure;
479 nla_nest_end(skb, nest_parms);
480
481 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
482 if (!nest_parms)
483 goto nla_put_failure;
484 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
485 goto nla_put_failure;
486 nla_nest_end(skb, nest_parms);
487
488 if (nf_ct_zone(ct) &&
489 nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
490 goto nla_put_failure;
491
492 if (ctnetlink_dump_status(skb, ct) < 0 ||
493 ctnetlink_dump_timeout(skb, ct) < 0 ||
494 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL, type) < 0 ||
495 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY, type) < 0 ||
496 ctnetlink_dump_timestamp(skb, ct) < 0 ||
497 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
498 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
499 ctnetlink_dump_mark(skb, ct) < 0 ||
500 ctnetlink_dump_secctx(skb, ct) < 0 ||
501 ctnetlink_dump_labels(skb, ct) < 0 ||
502 ctnetlink_dump_id(skb, ct) < 0 ||
503 ctnetlink_dump_use(skb, ct) < 0 ||
504 ctnetlink_dump_master(skb, ct) < 0 ||
505 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
506 goto nla_put_failure;
507
508 nlmsg_end(skb, nlh);
509 return skb->len;
510
511 nlmsg_failure:
512 nla_put_failure:
513 nlmsg_cancel(skb, nlh);
514 return -1;
515 }
516
517 static inline size_t
518 ctnetlink_proto_size(const struct nf_conn *ct)
519 {
520 struct nf_conntrack_l3proto *l3proto;
521 struct nf_conntrack_l4proto *l4proto;
522 size_t len = 0;
523
524 rcu_read_lock();
525 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
526 len += l3proto->nla_size;
527
528 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
529 len += l4proto->nla_size;
530 rcu_read_unlock();
531
532 return len;
533 }
534
535 static inline size_t
536 ctnetlink_counters_size(const struct nf_conn *ct)
537 {
538 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
539 return 0;
540 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
541 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
542 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
543 ;
544 }
545
546 static inline int
547 ctnetlink_secctx_size(const struct nf_conn *ct)
548 {
549 #ifdef CONFIG_NF_CONNTRACK_SECMARK
550 int len, ret;
551
552 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
553 if (ret)
554 return 0;
555
556 return nla_total_size(0) /* CTA_SECCTX */
557 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
558 #else
559 return 0;
560 #endif
561 }
562
563 static inline size_t
564 ctnetlink_timestamp_size(const struct nf_conn *ct)
565 {
566 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
567 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
568 return 0;
569 return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
570 #else
571 return 0;
572 #endif
573 }
574
575 static inline size_t
576 ctnetlink_nlmsg_size(const struct nf_conn *ct)
577 {
578 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
579 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
580 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
581 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
582 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
583 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
584 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
585 + ctnetlink_counters_size(ct)
586 + ctnetlink_timestamp_size(ct)
587 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
588 + nla_total_size(0) /* CTA_PROTOINFO */
589 + nla_total_size(0) /* CTA_HELP */
590 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
591 + ctnetlink_secctx_size(ct)
592 #ifdef CONFIG_NF_NAT_NEEDED
593 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
594 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
595 #endif
596 #ifdef CONFIG_NF_CONNTRACK_MARK
597 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
598 #endif
599 + ctnetlink_proto_size(ct)
600 + ctnetlink_label_size(ct)
601 ;
602 }
603
604 #ifdef CONFIG_NF_CONNTRACK_EVENTS
605 static int
606 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
607 {
608 struct net *net;
609 struct nlmsghdr *nlh;
610 struct nfgenmsg *nfmsg;
611 struct nlattr *nest_parms;
612 struct nf_conn *ct = item->ct;
613 struct sk_buff *skb;
614 unsigned int type;
615 unsigned int flags = 0, group;
616 int err;
617
618 /* ignore our fake conntrack entry */
619 if (nf_ct_is_untracked(ct))
620 return 0;
621
622 if (events & (1 << IPCT_DESTROY)) {
623 type = IPCTNL_MSG_CT_DELETE;
624 group = NFNLGRP_CONNTRACK_DESTROY;
625 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
626 type = IPCTNL_MSG_CT_NEW;
627 flags = NLM_F_CREATE|NLM_F_EXCL;
628 group = NFNLGRP_CONNTRACK_NEW;
629 } else if (events) {
630 type = IPCTNL_MSG_CT_NEW;
631 group = NFNLGRP_CONNTRACK_UPDATE;
632 } else
633 return 0;
634
635 net = nf_ct_net(ct);
636 if (!item->report && !nfnetlink_has_listeners(net, group))
637 return 0;
638
639 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
640 if (skb == NULL)
641 goto errout;
642
643 type |= NFNL_SUBSYS_CTNETLINK << 8;
644 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
645 if (nlh == NULL)
646 goto nlmsg_failure;
647
648 nfmsg = nlmsg_data(nlh);
649 nfmsg->nfgen_family = nf_ct_l3num(ct);
650 nfmsg->version = NFNETLINK_V0;
651 nfmsg->res_id = 0;
652
653 rcu_read_lock();
654 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
655 if (!nest_parms)
656 goto nla_put_failure;
657 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
658 goto nla_put_failure;
659 nla_nest_end(skb, nest_parms);
660
661 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
662 if (!nest_parms)
663 goto nla_put_failure;
664 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
665 goto nla_put_failure;
666 nla_nest_end(skb, nest_parms);
667
668 if (nf_ct_zone(ct) &&
669 nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
670 goto nla_put_failure;
671
672 if (ctnetlink_dump_id(skb, ct) < 0)
673 goto nla_put_failure;
674
675 if (ctnetlink_dump_status(skb, ct) < 0)
676 goto nla_put_failure;
677
678 if (events & (1 << IPCT_DESTROY)) {
679 if (ctnetlink_dump_counters(skb, ct,
680 IP_CT_DIR_ORIGINAL, type) < 0 ||
681 ctnetlink_dump_counters(skb, ct,
682 IP_CT_DIR_REPLY, type) < 0 ||
683 ctnetlink_dump_timestamp(skb, ct) < 0)
684 goto nla_put_failure;
685 } else {
686 if (ctnetlink_dump_timeout(skb, ct) < 0)
687 goto nla_put_failure;
688
689 if (events & (1 << IPCT_PROTOINFO)
690 && ctnetlink_dump_protoinfo(skb, ct) < 0)
691 goto nla_put_failure;
692
693 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
694 && ctnetlink_dump_helpinfo(skb, ct) < 0)
695 goto nla_put_failure;
696
697 #ifdef CONFIG_NF_CONNTRACK_SECMARK
698 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
699 && ctnetlink_dump_secctx(skb, ct) < 0)
700 goto nla_put_failure;
701 #endif
702 if (events & (1 << IPCT_LABEL) &&
703 ctnetlink_dump_labels(skb, ct) < 0)
704 goto nla_put_failure;
705
706 if (events & (1 << IPCT_RELATED) &&
707 ctnetlink_dump_master(skb, ct) < 0)
708 goto nla_put_failure;
709
710 if (events & (1 << IPCT_NATSEQADJ) &&
711 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
712 goto nla_put_failure;
713 }
714
715 #ifdef CONFIG_NF_CONNTRACK_MARK
716 if ((events & (1 << IPCT_MARK) || ct->mark)
717 && ctnetlink_dump_mark(skb, ct) < 0)
718 goto nla_put_failure;
719 #endif
720 rcu_read_unlock();
721
722 nlmsg_end(skb, nlh);
723 err = nfnetlink_send(skb, net, item->portid, group, item->report,
724 GFP_ATOMIC);
725 if (err == -ENOBUFS || err == -EAGAIN)
726 return -ENOBUFS;
727
728 return 0;
729
730 nla_put_failure:
731 rcu_read_unlock();
732 nlmsg_cancel(skb, nlh);
733 nlmsg_failure:
734 kfree_skb(skb);
735 errout:
736 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
737 return -ENOBUFS;
738
739 return 0;
740 }
741 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
742
743 static int ctnetlink_done(struct netlink_callback *cb)
744 {
745 if (cb->args[1])
746 nf_ct_put((struct nf_conn *)cb->args[1]);
747 if (cb->data)
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 #ifdef CONFIG_NF_CONNTRACK_MARK
770 const struct ctnetlink_dump_filter *filter = cb->data;
771 #endif
772
773 spin_lock_bh(&nf_conntrack_lock);
774 last = (struct nf_conn *)cb->args[1];
775 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
776 restart:
777 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
778 hnnode) {
779 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
780 continue;
781 ct = nf_ct_tuplehash_to_ctrack(h);
782 /* Dump entries of a given L3 protocol number.
783 * If it is not specified, ie. l3proto == 0,
784 * then dump everything. */
785 if (l3proto && nf_ct_l3num(ct) != l3proto)
786 continue;
787 if (cb->args[1]) {
788 if (ct != last)
789 continue;
790 cb->args[1] = 0;
791 }
792 #ifdef CONFIG_NF_CONNTRACK_MARK
793 if (filter && !((ct->mark & filter->mark.mask) ==
794 filter->mark.val)) {
795 continue;
796 }
797 #endif
798 rcu_read_lock();
799 res =
800 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
801 cb->nlh->nlmsg_seq,
802 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
803 ct);
804 rcu_read_unlock();
805 if (res < 0) {
806 nf_conntrack_get(&ct->ct_general);
807 cb->args[1] = (unsigned long)ct;
808 goto out;
809 }
810 }
811 if (cb->args[1]) {
812 cb->args[1] = 0;
813 goto restart;
814 }
815 }
816 out:
817 spin_unlock_bh(&nf_conntrack_lock);
818 if (last)
819 nf_ct_put(last);
820
821 return skb->len;
822 }
823
824 static inline int
825 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
826 {
827 struct nlattr *tb[CTA_IP_MAX+1];
828 struct nf_conntrack_l3proto *l3proto;
829 int ret = 0;
830
831 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
832
833 rcu_read_lock();
834 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
835
836 if (likely(l3proto->nlattr_to_tuple)) {
837 ret = nla_validate_nested(attr, CTA_IP_MAX,
838 l3proto->nla_policy);
839 if (ret == 0)
840 ret = l3proto->nlattr_to_tuple(tb, tuple);
841 }
842
843 rcu_read_unlock();
844
845 return ret;
846 }
847
848 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
849 [CTA_PROTO_NUM] = { .type = NLA_U8 },
850 };
851
852 static inline int
853 ctnetlink_parse_tuple_proto(struct nlattr *attr,
854 struct nf_conntrack_tuple *tuple)
855 {
856 struct nlattr *tb[CTA_PROTO_MAX+1];
857 struct nf_conntrack_l4proto *l4proto;
858 int ret = 0;
859
860 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
861 if (ret < 0)
862 return ret;
863
864 if (!tb[CTA_PROTO_NUM])
865 return -EINVAL;
866 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
867
868 rcu_read_lock();
869 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
870
871 if (likely(l4proto->nlattr_to_tuple)) {
872 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
873 l4proto->nla_policy);
874 if (ret == 0)
875 ret = l4proto->nlattr_to_tuple(tb, tuple);
876 }
877
878 rcu_read_unlock();
879
880 return ret;
881 }
882
883 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
884 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
885 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
886 };
887
888 static int
889 ctnetlink_parse_tuple(const struct nlattr * const cda[],
890 struct nf_conntrack_tuple *tuple,
891 enum ctattr_type type, u_int8_t l3num)
892 {
893 struct nlattr *tb[CTA_TUPLE_MAX+1];
894 int err;
895
896 memset(tuple, 0, sizeof(*tuple));
897
898 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
899
900 if (!tb[CTA_TUPLE_IP])
901 return -EINVAL;
902
903 tuple->src.l3num = l3num;
904
905 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
906 if (err < 0)
907 return err;
908
909 if (!tb[CTA_TUPLE_PROTO])
910 return -EINVAL;
911
912 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
913 if (err < 0)
914 return err;
915
916 /* orig and expect tuples get DIR_ORIGINAL */
917 if (type == CTA_TUPLE_REPLY)
918 tuple->dst.dir = IP_CT_DIR_REPLY;
919 else
920 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
921
922 return 0;
923 }
924
925 static int
926 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
927 {
928 if (attr)
929 #ifdef CONFIG_NF_CONNTRACK_ZONES
930 *zone = ntohs(nla_get_be16(attr));
931 #else
932 return -EOPNOTSUPP;
933 #endif
934 else
935 *zone = 0;
936
937 return 0;
938 }
939
940 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
941 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
942 .len = NF_CT_HELPER_NAME_LEN - 1 },
943 };
944
945 static inline int
946 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
947 struct nlattr **helpinfo)
948 {
949 struct nlattr *tb[CTA_HELP_MAX+1];
950
951 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
952
953 if (!tb[CTA_HELP_NAME])
954 return -EINVAL;
955
956 *helper_name = nla_data(tb[CTA_HELP_NAME]);
957
958 if (tb[CTA_HELP_INFO])
959 *helpinfo = tb[CTA_HELP_INFO];
960
961 return 0;
962 }
963
964 #define __CTA_LABELS_MAX_LENGTH ((XT_CONNLABEL_MAXBIT + 1) / BITS_PER_BYTE)
965 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
966 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
967 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
968 [CTA_STATUS] = { .type = NLA_U32 },
969 [CTA_PROTOINFO] = { .type = NLA_NESTED },
970 [CTA_HELP] = { .type = NLA_NESTED },
971 [CTA_NAT_SRC] = { .type = NLA_NESTED },
972 [CTA_TIMEOUT] = { .type = NLA_U32 },
973 [CTA_MARK] = { .type = NLA_U32 },
974 [CTA_ID] = { .type = NLA_U32 },
975 [CTA_NAT_DST] = { .type = NLA_NESTED },
976 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
977 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
978 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
979 [CTA_ZONE] = { .type = NLA_U16 },
980 [CTA_MARK_MASK] = { .type = NLA_U32 },
981 [CTA_LABELS] = { .type = NLA_BINARY,
982 .len = __CTA_LABELS_MAX_LENGTH },
983 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
984 .len = __CTA_LABELS_MAX_LENGTH },
985 };
986
987 static int
988 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
989 const struct nlmsghdr *nlh,
990 const struct nlattr * const cda[])
991 {
992 struct net *net = sock_net(ctnl);
993 struct nf_conntrack_tuple_hash *h;
994 struct nf_conntrack_tuple tuple;
995 struct nf_conn *ct;
996 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
997 u_int8_t u3 = nfmsg->nfgen_family;
998 u16 zone;
999 int err;
1000
1001 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1002 if (err < 0)
1003 return err;
1004
1005 if (cda[CTA_TUPLE_ORIG])
1006 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1007 else if (cda[CTA_TUPLE_REPLY])
1008 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1009 else {
1010 /* Flush the whole table */
1011 nf_conntrack_flush_report(net,
1012 NETLINK_CB(skb).portid,
1013 nlmsg_report(nlh));
1014 return 0;
1015 }
1016
1017 if (err < 0)
1018 return err;
1019
1020 h = nf_conntrack_find_get(net, zone, &tuple);
1021 if (!h)
1022 return -ENOENT;
1023
1024 ct = nf_ct_tuplehash_to_ctrack(h);
1025
1026 if (cda[CTA_ID]) {
1027 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1028 if (id != (u32)(unsigned long)ct) {
1029 nf_ct_put(ct);
1030 return -ENOENT;
1031 }
1032 }
1033
1034 if (del_timer(&ct->timeout)) {
1035 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
1036 NETLINK_CB(skb).portid,
1037 nlmsg_report(nlh)) < 0) {
1038 nf_ct_delete_from_lists(ct);
1039 /* we failed to report the event, try later */
1040 nf_ct_dying_timeout(ct);
1041 nf_ct_put(ct);
1042 return 0;
1043 }
1044 /* death_by_timeout would report the event again */
1045 set_bit(IPS_DYING_BIT, &ct->status);
1046 nf_ct_delete_from_lists(ct);
1047 nf_ct_put(ct);
1048 }
1049 nf_ct_put(ct);
1050
1051 return 0;
1052 }
1053
1054 static int
1055 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
1056 const struct nlmsghdr *nlh,
1057 const struct nlattr * const cda[])
1058 {
1059 struct net *net = sock_net(ctnl);
1060 struct nf_conntrack_tuple_hash *h;
1061 struct nf_conntrack_tuple tuple;
1062 struct nf_conn *ct;
1063 struct sk_buff *skb2 = NULL;
1064 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1065 u_int8_t u3 = nfmsg->nfgen_family;
1066 u16 zone;
1067 int err;
1068
1069 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1070 struct netlink_dump_control c = {
1071 .dump = ctnetlink_dump_table,
1072 .done = ctnetlink_done,
1073 };
1074 #ifdef CONFIG_NF_CONNTRACK_MARK
1075 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1076 struct ctnetlink_dump_filter *filter;
1077
1078 filter = kzalloc(sizeof(struct ctnetlink_dump_filter),
1079 GFP_ATOMIC);
1080 if (filter == NULL)
1081 return -ENOMEM;
1082
1083 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
1084 filter->mark.mask =
1085 ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1086 c.data = filter;
1087 }
1088 #endif
1089 return netlink_dump_start(ctnl, skb, nlh, &c);
1090 }
1091
1092 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1093 if (err < 0)
1094 return err;
1095
1096 if (cda[CTA_TUPLE_ORIG])
1097 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1098 else if (cda[CTA_TUPLE_REPLY])
1099 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1100 else
1101 return -EINVAL;
1102
1103 if (err < 0)
1104 return err;
1105
1106 h = nf_conntrack_find_get(net, zone, &tuple);
1107 if (!h)
1108 return -ENOENT;
1109
1110 ct = nf_ct_tuplehash_to_ctrack(h);
1111
1112 err = -ENOMEM;
1113 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1114 if (skb2 == NULL) {
1115 nf_ct_put(ct);
1116 return -ENOMEM;
1117 }
1118
1119 rcu_read_lock();
1120 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1121 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1122 rcu_read_unlock();
1123 nf_ct_put(ct);
1124 if (err <= 0)
1125 goto free;
1126
1127 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1128 if (err < 0)
1129 goto out;
1130
1131 return 0;
1132
1133 free:
1134 kfree_skb(skb2);
1135 out:
1136 /* this avoids a loop in nfnetlink. */
1137 return err == -EAGAIN ? -ENOBUFS : err;
1138 }
1139
1140 static int ctnetlink_done_list(struct netlink_callback *cb)
1141 {
1142 if (cb->args[1])
1143 nf_ct_put((struct nf_conn *)cb->args[1]);
1144 return 0;
1145 }
1146
1147 static int
1148 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb,
1149 struct hlist_nulls_head *list)
1150 {
1151 struct nf_conn *ct, *last;
1152 struct nf_conntrack_tuple_hash *h;
1153 struct hlist_nulls_node *n;
1154 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1155 u_int8_t l3proto = nfmsg->nfgen_family;
1156 int res;
1157
1158 if (cb->args[2])
1159 return 0;
1160
1161 spin_lock_bh(&nf_conntrack_lock);
1162 last = (struct nf_conn *)cb->args[1];
1163 restart:
1164 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1165 ct = nf_ct_tuplehash_to_ctrack(h);
1166 if (l3proto && nf_ct_l3num(ct) != l3proto)
1167 continue;
1168 if (cb->args[1]) {
1169 if (ct != last)
1170 continue;
1171 cb->args[1] = 0;
1172 }
1173 rcu_read_lock();
1174 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1175 cb->nlh->nlmsg_seq,
1176 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1177 ct);
1178 rcu_read_unlock();
1179 if (res < 0) {
1180 nf_conntrack_get(&ct->ct_general);
1181 cb->args[1] = (unsigned long)ct;
1182 goto out;
1183 }
1184 }
1185 if (cb->args[1]) {
1186 cb->args[1] = 0;
1187 goto restart;
1188 } else
1189 cb->args[2] = 1;
1190 out:
1191 spin_unlock_bh(&nf_conntrack_lock);
1192 if (last)
1193 nf_ct_put(last);
1194
1195 return skb->len;
1196 }
1197
1198 static int
1199 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1200 {
1201 struct net *net = sock_net(skb->sk);
1202
1203 return ctnetlink_dump_list(skb, cb, &net->ct.dying);
1204 }
1205
1206 static int
1207 ctnetlink_get_ct_dying(struct sock *ctnl, struct sk_buff *skb,
1208 const struct nlmsghdr *nlh,
1209 const struct nlattr * const cda[])
1210 {
1211 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1212 struct netlink_dump_control c = {
1213 .dump = ctnetlink_dump_dying,
1214 .done = ctnetlink_done_list,
1215 };
1216 return netlink_dump_start(ctnl, skb, nlh, &c);
1217 }
1218
1219 return -EOPNOTSUPP;
1220 }
1221
1222 static int
1223 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1224 {
1225 struct net *net = sock_net(skb->sk);
1226
1227 return ctnetlink_dump_list(skb, cb, &net->ct.unconfirmed);
1228 }
1229
1230 static int
1231 ctnetlink_get_ct_unconfirmed(struct sock *ctnl, struct sk_buff *skb,
1232 const struct nlmsghdr *nlh,
1233 const struct nlattr * const cda[])
1234 {
1235 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1236 struct netlink_dump_control c = {
1237 .dump = ctnetlink_dump_unconfirmed,
1238 .done = ctnetlink_done_list,
1239 };
1240 return netlink_dump_start(ctnl, skb, nlh, &c);
1241 }
1242
1243 return -EOPNOTSUPP;
1244 }
1245
1246 #ifdef CONFIG_NF_NAT_NEEDED
1247 static int
1248 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1249 enum nf_nat_manip_type manip,
1250 const struct nlattr *attr)
1251 {
1252 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1253 int err;
1254
1255 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1256 if (!parse_nat_setup) {
1257 #ifdef CONFIG_MODULES
1258 rcu_read_unlock();
1259 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1260 if (request_module("nf-nat") < 0) {
1261 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1262 rcu_read_lock();
1263 return -EOPNOTSUPP;
1264 }
1265 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1266 rcu_read_lock();
1267 if (nfnetlink_parse_nat_setup_hook)
1268 return -EAGAIN;
1269 #endif
1270 return -EOPNOTSUPP;
1271 }
1272
1273 err = parse_nat_setup(ct, manip, attr);
1274 if (err == -EAGAIN) {
1275 #ifdef CONFIG_MODULES
1276 rcu_read_unlock();
1277 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1278 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1279 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1280 rcu_read_lock();
1281 return -EOPNOTSUPP;
1282 }
1283 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1284 rcu_read_lock();
1285 #else
1286 err = -EOPNOTSUPP;
1287 #endif
1288 }
1289 return err;
1290 }
1291 #endif
1292
1293 static int
1294 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1295 {
1296 unsigned long d;
1297 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1298 d = ct->status ^ status;
1299
1300 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1301 /* unchangeable */
1302 return -EBUSY;
1303
1304 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1305 /* SEEN_REPLY bit can only be set */
1306 return -EBUSY;
1307
1308 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1309 /* ASSURED bit can only be set */
1310 return -EBUSY;
1311
1312 /* Be careful here, modifying NAT bits can screw up things,
1313 * so don't let users modify them directly if they don't pass
1314 * nf_nat_range. */
1315 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1316 return 0;
1317 }
1318
1319 static int
1320 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1321 {
1322 #ifdef CONFIG_NF_NAT_NEEDED
1323 int ret;
1324
1325 if (cda[CTA_NAT_DST]) {
1326 ret = ctnetlink_parse_nat_setup(ct,
1327 NF_NAT_MANIP_DST,
1328 cda[CTA_NAT_DST]);
1329 if (ret < 0)
1330 return ret;
1331 }
1332 if (cda[CTA_NAT_SRC]) {
1333 ret = ctnetlink_parse_nat_setup(ct,
1334 NF_NAT_MANIP_SRC,
1335 cda[CTA_NAT_SRC]);
1336 if (ret < 0)
1337 return ret;
1338 }
1339 return 0;
1340 #else
1341 return -EOPNOTSUPP;
1342 #endif
1343 }
1344
1345 static inline int
1346 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1347 {
1348 struct nf_conntrack_helper *helper;
1349 struct nf_conn_help *help = nfct_help(ct);
1350 char *helpname = NULL;
1351 struct nlattr *helpinfo = NULL;
1352 int err;
1353
1354 /* don't change helper of sibling connections */
1355 if (ct->master)
1356 return -EBUSY;
1357
1358 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1359 if (err < 0)
1360 return err;
1361
1362 if (!strcmp(helpname, "")) {
1363 if (help && help->helper) {
1364 /* we had a helper before ... */
1365 nf_ct_remove_expectations(ct);
1366 RCU_INIT_POINTER(help->helper, NULL);
1367 }
1368
1369 return 0;
1370 }
1371
1372 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1373 nf_ct_protonum(ct));
1374 if (helper == NULL) {
1375 #ifdef CONFIG_MODULES
1376 spin_unlock_bh(&nf_conntrack_lock);
1377
1378 if (request_module("nfct-helper-%s", helpname) < 0) {
1379 spin_lock_bh(&nf_conntrack_lock);
1380 return -EOPNOTSUPP;
1381 }
1382
1383 spin_lock_bh(&nf_conntrack_lock);
1384 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1385 nf_ct_protonum(ct));
1386 if (helper)
1387 return -EAGAIN;
1388 #endif
1389 return -EOPNOTSUPP;
1390 }
1391
1392 if (help) {
1393 if (help->helper == helper) {
1394 /* update private helper data if allowed. */
1395 if (helper->from_nlattr)
1396 helper->from_nlattr(helpinfo, ct);
1397 return 0;
1398 } else
1399 return -EBUSY;
1400 }
1401
1402 /* we cannot set a helper for an existing conntrack */
1403 return -EOPNOTSUPP;
1404 }
1405
1406 static inline int
1407 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1408 {
1409 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1410
1411 if (!del_timer(&ct->timeout))
1412 return -ETIME;
1413
1414 ct->timeout.expires = jiffies + timeout * HZ;
1415 add_timer(&ct->timeout);
1416
1417 return 0;
1418 }
1419
1420 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1421 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1422 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1423 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1424 };
1425
1426 static inline int
1427 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1428 {
1429 const struct nlattr *attr = cda[CTA_PROTOINFO];
1430 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1431 struct nf_conntrack_l4proto *l4proto;
1432 int err = 0;
1433
1434 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1435
1436 rcu_read_lock();
1437 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1438 if (l4proto->from_nlattr)
1439 err = l4proto->from_nlattr(tb, ct);
1440 rcu_read_unlock();
1441
1442 return err;
1443 }
1444
1445 #ifdef CONFIG_NF_NAT_NEEDED
1446 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1447 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1448 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1449 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1450 };
1451
1452 static inline int
1453 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1454 {
1455 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1456
1457 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1458
1459 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1460 return -EINVAL;
1461
1462 natseq->correction_pos =
1463 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1464
1465 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1466 return -EINVAL;
1467
1468 natseq->offset_before =
1469 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1470
1471 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1472 return -EINVAL;
1473
1474 natseq->offset_after =
1475 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1476
1477 return 0;
1478 }
1479
1480 static int
1481 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1482 const struct nlattr * const cda[])
1483 {
1484 int ret = 0;
1485 struct nf_conn_nat *nat = nfct_nat(ct);
1486
1487 if (!nat)
1488 return 0;
1489
1490 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1491 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1492 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1493 if (ret < 0)
1494 return ret;
1495
1496 ct->status |= IPS_SEQ_ADJUST;
1497 }
1498
1499 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1500 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1501 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1502 if (ret < 0)
1503 return ret;
1504
1505 ct->status |= IPS_SEQ_ADJUST;
1506 }
1507
1508 return 0;
1509 }
1510 #endif
1511
1512 static int
1513 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1514 {
1515 #ifdef CONFIG_NF_CONNTRACK_LABELS
1516 size_t len = nla_len(cda[CTA_LABELS]);
1517 const void *mask = cda[CTA_LABELS_MASK];
1518
1519 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1520 return -EINVAL;
1521
1522 if (mask) {
1523 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1524 nla_len(cda[CTA_LABELS_MASK]) != len)
1525 return -EINVAL;
1526 mask = nla_data(cda[CTA_LABELS_MASK]);
1527 }
1528
1529 len /= sizeof(u32);
1530
1531 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1532 #else
1533 return -EOPNOTSUPP;
1534 #endif
1535 }
1536
1537 static int
1538 ctnetlink_change_conntrack(struct nf_conn *ct,
1539 const struct nlattr * const cda[])
1540 {
1541 int err;
1542
1543 /* only allow NAT changes and master assignation for new conntracks */
1544 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1545 return -EOPNOTSUPP;
1546
1547 if (cda[CTA_HELP]) {
1548 err = ctnetlink_change_helper(ct, cda);
1549 if (err < 0)
1550 return err;
1551 }
1552
1553 if (cda[CTA_TIMEOUT]) {
1554 err = ctnetlink_change_timeout(ct, cda);
1555 if (err < 0)
1556 return err;
1557 }
1558
1559 if (cda[CTA_STATUS]) {
1560 err = ctnetlink_change_status(ct, cda);
1561 if (err < 0)
1562 return err;
1563 }
1564
1565 if (cda[CTA_PROTOINFO]) {
1566 err = ctnetlink_change_protoinfo(ct, cda);
1567 if (err < 0)
1568 return err;
1569 }
1570
1571 #if defined(CONFIG_NF_CONNTRACK_MARK)
1572 if (cda[CTA_MARK])
1573 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1574 #endif
1575
1576 #ifdef CONFIG_NF_NAT_NEEDED
1577 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1578 err = ctnetlink_change_nat_seq_adj(ct, cda);
1579 if (err < 0)
1580 return err;
1581 }
1582 #endif
1583 if (cda[CTA_LABELS]) {
1584 err = ctnetlink_attach_labels(ct, cda);
1585 if (err < 0)
1586 return err;
1587 }
1588
1589 return 0;
1590 }
1591
1592 static struct nf_conn *
1593 ctnetlink_create_conntrack(struct net *net, u16 zone,
1594 const struct nlattr * const cda[],
1595 struct nf_conntrack_tuple *otuple,
1596 struct nf_conntrack_tuple *rtuple,
1597 u8 u3)
1598 {
1599 struct nf_conn *ct;
1600 int err = -EINVAL;
1601 struct nf_conntrack_helper *helper;
1602 struct nf_conn_tstamp *tstamp;
1603
1604 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1605 if (IS_ERR(ct))
1606 return ERR_PTR(-ENOMEM);
1607
1608 if (!cda[CTA_TIMEOUT])
1609 goto err1;
1610 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1611
1612 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1613
1614 rcu_read_lock();
1615 if (cda[CTA_HELP]) {
1616 char *helpname = NULL;
1617 struct nlattr *helpinfo = NULL;
1618
1619 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1620 if (err < 0)
1621 goto err2;
1622
1623 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1624 nf_ct_protonum(ct));
1625 if (helper == NULL) {
1626 rcu_read_unlock();
1627 #ifdef CONFIG_MODULES
1628 if (request_module("nfct-helper-%s", helpname) < 0) {
1629 err = -EOPNOTSUPP;
1630 goto err1;
1631 }
1632
1633 rcu_read_lock();
1634 helper = __nf_conntrack_helper_find(helpname,
1635 nf_ct_l3num(ct),
1636 nf_ct_protonum(ct));
1637 if (helper) {
1638 err = -EAGAIN;
1639 goto err2;
1640 }
1641 rcu_read_unlock();
1642 #endif
1643 err = -EOPNOTSUPP;
1644 goto err1;
1645 } else {
1646 struct nf_conn_help *help;
1647
1648 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1649 if (help == NULL) {
1650 err = -ENOMEM;
1651 goto err2;
1652 }
1653 /* set private helper data if allowed. */
1654 if (helper->from_nlattr)
1655 helper->from_nlattr(helpinfo, ct);
1656
1657 /* not in hash table yet so not strictly necessary */
1658 RCU_INIT_POINTER(help->helper, helper);
1659 }
1660 } else {
1661 /* try an implicit helper assignation */
1662 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1663 if (err < 0)
1664 goto err2;
1665 }
1666
1667 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1668 err = ctnetlink_change_nat(ct, cda);
1669 if (err < 0)
1670 goto err2;
1671 }
1672
1673 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1674 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1675 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1676 nf_ct_labels_ext_add(ct);
1677
1678 /* we must add conntrack extensions before confirmation. */
1679 ct->status |= IPS_CONFIRMED;
1680
1681 if (cda[CTA_STATUS]) {
1682 err = ctnetlink_change_status(ct, cda);
1683 if (err < 0)
1684 goto err2;
1685 }
1686
1687 #ifdef CONFIG_NF_NAT_NEEDED
1688 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1689 err = ctnetlink_change_nat_seq_adj(ct, cda);
1690 if (err < 0)
1691 goto err2;
1692 }
1693 #endif
1694
1695 memset(&ct->proto, 0, sizeof(ct->proto));
1696 if (cda[CTA_PROTOINFO]) {
1697 err = ctnetlink_change_protoinfo(ct, cda);
1698 if (err < 0)
1699 goto err2;
1700 }
1701
1702 #if defined(CONFIG_NF_CONNTRACK_MARK)
1703 if (cda[CTA_MARK])
1704 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1705 #endif
1706
1707 /* setup master conntrack: this is a confirmed expectation */
1708 if (cda[CTA_TUPLE_MASTER]) {
1709 struct nf_conntrack_tuple master;
1710 struct nf_conntrack_tuple_hash *master_h;
1711 struct nf_conn *master_ct;
1712
1713 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1714 if (err < 0)
1715 goto err2;
1716
1717 master_h = nf_conntrack_find_get(net, zone, &master);
1718 if (master_h == NULL) {
1719 err = -ENOENT;
1720 goto err2;
1721 }
1722 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1723 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1724 ct->master = master_ct;
1725 }
1726 tstamp = nf_conn_tstamp_find(ct);
1727 if (tstamp)
1728 tstamp->start = ktime_to_ns(ktime_get_real());
1729
1730 err = nf_conntrack_hash_check_insert(ct);
1731 if (err < 0)
1732 goto err2;
1733
1734 rcu_read_unlock();
1735
1736 return ct;
1737
1738 err2:
1739 rcu_read_unlock();
1740 err1:
1741 nf_conntrack_free(ct);
1742 return ERR_PTR(err);
1743 }
1744
1745 static int
1746 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1747 const struct nlmsghdr *nlh,
1748 const struct nlattr * const cda[])
1749 {
1750 struct net *net = sock_net(ctnl);
1751 struct nf_conntrack_tuple otuple, rtuple;
1752 struct nf_conntrack_tuple_hash *h = NULL;
1753 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1754 struct nf_conn *ct;
1755 u_int8_t u3 = nfmsg->nfgen_family;
1756 u16 zone;
1757 int err;
1758
1759 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1760 if (err < 0)
1761 return err;
1762
1763 if (cda[CTA_TUPLE_ORIG]) {
1764 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1765 if (err < 0)
1766 return err;
1767 }
1768
1769 if (cda[CTA_TUPLE_REPLY]) {
1770 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1771 if (err < 0)
1772 return err;
1773 }
1774
1775 if (cda[CTA_TUPLE_ORIG])
1776 h = nf_conntrack_find_get(net, zone, &otuple);
1777 else if (cda[CTA_TUPLE_REPLY])
1778 h = nf_conntrack_find_get(net, zone, &rtuple);
1779
1780 if (h == NULL) {
1781 err = -ENOENT;
1782 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1783 enum ip_conntrack_events events;
1784
1785 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1786 return -EINVAL;
1787
1788 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1789 &rtuple, u3);
1790 if (IS_ERR(ct))
1791 return PTR_ERR(ct);
1792
1793 err = 0;
1794 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1795 events = IPCT_RELATED;
1796 else
1797 events = IPCT_NEW;
1798
1799 if (cda[CTA_LABELS] &&
1800 ctnetlink_attach_labels(ct, cda) == 0)
1801 events |= (1 << IPCT_LABEL);
1802
1803 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1804 (1 << IPCT_ASSURED) |
1805 (1 << IPCT_HELPER) |
1806 (1 << IPCT_PROTOINFO) |
1807 (1 << IPCT_NATSEQADJ) |
1808 (1 << IPCT_MARK) | events,
1809 ct, NETLINK_CB(skb).portid,
1810 nlmsg_report(nlh));
1811 nf_ct_put(ct);
1812 }
1813
1814 return err;
1815 }
1816 /* implicit 'else' */
1817
1818 err = -EEXIST;
1819 ct = nf_ct_tuplehash_to_ctrack(h);
1820 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1821 spin_lock_bh(&nf_conntrack_lock);
1822 err = ctnetlink_change_conntrack(ct, cda);
1823 spin_unlock_bh(&nf_conntrack_lock);
1824 if (err == 0) {
1825 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1826 (1 << IPCT_ASSURED) |
1827 (1 << IPCT_HELPER) |
1828 (1 << IPCT_PROTOINFO) |
1829 (1 << IPCT_NATSEQADJ) |
1830 (1 << IPCT_MARK),
1831 ct, NETLINK_CB(skb).portid,
1832 nlmsg_report(nlh));
1833 }
1834 }
1835
1836 nf_ct_put(ct);
1837 return err;
1838 }
1839
1840 static int
1841 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1842 __u16 cpu, const struct ip_conntrack_stat *st)
1843 {
1844 struct nlmsghdr *nlh;
1845 struct nfgenmsg *nfmsg;
1846 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1847
1848 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1849 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1850 if (nlh == NULL)
1851 goto nlmsg_failure;
1852
1853 nfmsg = nlmsg_data(nlh);
1854 nfmsg->nfgen_family = AF_UNSPEC;
1855 nfmsg->version = NFNETLINK_V0;
1856 nfmsg->res_id = htons(cpu);
1857
1858 if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1859 nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1860 nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
1861 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1862 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1863 nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
1864 nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
1865 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1866 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1867 htonl(st->insert_failed)) ||
1868 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1869 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1870 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1871 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1872 htonl(st->search_restart)))
1873 goto nla_put_failure;
1874
1875 nlmsg_end(skb, nlh);
1876 return skb->len;
1877
1878 nla_put_failure:
1879 nlmsg_failure:
1880 nlmsg_cancel(skb, nlh);
1881 return -1;
1882 }
1883
1884 static int
1885 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
1886 {
1887 int cpu;
1888 struct net *net = sock_net(skb->sk);
1889
1890 if (cb->args[0] == nr_cpu_ids)
1891 return 0;
1892
1893 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1894 const struct ip_conntrack_stat *st;
1895
1896 if (!cpu_possible(cpu))
1897 continue;
1898
1899 st = per_cpu_ptr(net->ct.stat, cpu);
1900 if (ctnetlink_ct_stat_cpu_fill_info(skb,
1901 NETLINK_CB(cb->skb).portid,
1902 cb->nlh->nlmsg_seq,
1903 cpu, st) < 0)
1904 break;
1905 }
1906 cb->args[0] = cpu;
1907
1908 return skb->len;
1909 }
1910
1911 static int
1912 ctnetlink_stat_ct_cpu(struct sock *ctnl, struct sk_buff *skb,
1913 const struct nlmsghdr *nlh,
1914 const struct nlattr * const cda[])
1915 {
1916 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1917 struct netlink_dump_control c = {
1918 .dump = ctnetlink_ct_stat_cpu_dump,
1919 };
1920 return netlink_dump_start(ctnl, skb, nlh, &c);
1921 }
1922
1923 return 0;
1924 }
1925
1926 static int
1927 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
1928 struct net *net)
1929 {
1930 struct nlmsghdr *nlh;
1931 struct nfgenmsg *nfmsg;
1932 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1933 unsigned int nr_conntracks = atomic_read(&net->ct.count);
1934
1935 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
1936 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1937 if (nlh == NULL)
1938 goto nlmsg_failure;
1939
1940 nfmsg = nlmsg_data(nlh);
1941 nfmsg->nfgen_family = AF_UNSPEC;
1942 nfmsg->version = NFNETLINK_V0;
1943 nfmsg->res_id = 0;
1944
1945 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
1946 goto nla_put_failure;
1947
1948 nlmsg_end(skb, nlh);
1949 return skb->len;
1950
1951 nla_put_failure:
1952 nlmsg_failure:
1953 nlmsg_cancel(skb, nlh);
1954 return -1;
1955 }
1956
1957 static int
1958 ctnetlink_stat_ct(struct sock *ctnl, struct sk_buff *skb,
1959 const struct nlmsghdr *nlh,
1960 const struct nlattr * const cda[])
1961 {
1962 struct sk_buff *skb2;
1963 int err;
1964
1965 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1966 if (skb2 == NULL)
1967 return -ENOMEM;
1968
1969 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
1970 nlh->nlmsg_seq,
1971 NFNL_MSG_TYPE(nlh->nlmsg_type),
1972 sock_net(skb->sk));
1973 if (err <= 0)
1974 goto free;
1975
1976 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1977 if (err < 0)
1978 goto out;
1979
1980 return 0;
1981
1982 free:
1983 kfree_skb(skb2);
1984 out:
1985 /* this avoids a loop in nfnetlink. */
1986 return err == -EAGAIN ? -ENOBUFS : err;
1987 }
1988
1989 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
1990 static size_t
1991 ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
1992 {
1993 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
1994 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
1995 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
1996 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
1997 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
1998 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
1999 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2000 + nla_total_size(0) /* CTA_PROTOINFO */
2001 + nla_total_size(0) /* CTA_HELP */
2002 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2003 + ctnetlink_secctx_size(ct)
2004 #ifdef CONFIG_NF_NAT_NEEDED
2005 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2006 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2007 #endif
2008 #ifdef CONFIG_NF_CONNTRACK_MARK
2009 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2010 #endif
2011 + ctnetlink_proto_size(ct)
2012 ;
2013 }
2014
2015 static int
2016 ctnetlink_nfqueue_build(struct sk_buff *skb, struct nf_conn *ct)
2017 {
2018 struct nlattr *nest_parms;
2019
2020 rcu_read_lock();
2021 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2022 if (!nest_parms)
2023 goto nla_put_failure;
2024 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2025 goto nla_put_failure;
2026 nla_nest_end(skb, nest_parms);
2027
2028 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2029 if (!nest_parms)
2030 goto nla_put_failure;
2031 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2032 goto nla_put_failure;
2033 nla_nest_end(skb, nest_parms);
2034
2035 if (nf_ct_zone(ct)) {
2036 if (nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
2037 goto nla_put_failure;
2038 }
2039
2040 if (ctnetlink_dump_id(skb, ct) < 0)
2041 goto nla_put_failure;
2042
2043 if (ctnetlink_dump_status(skb, ct) < 0)
2044 goto nla_put_failure;
2045
2046 if (ctnetlink_dump_timeout(skb, ct) < 0)
2047 goto nla_put_failure;
2048
2049 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2050 goto nla_put_failure;
2051
2052 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2053 goto nla_put_failure;
2054
2055 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2056 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2057 goto nla_put_failure;
2058 #endif
2059 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2060 goto nla_put_failure;
2061
2062 if ((ct->status & IPS_SEQ_ADJUST) &&
2063 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
2064 goto nla_put_failure;
2065
2066 #ifdef CONFIG_NF_CONNTRACK_MARK
2067 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2068 goto nla_put_failure;
2069 #endif
2070 if (ctnetlink_dump_labels(skb, ct) < 0)
2071 goto nla_put_failure;
2072 rcu_read_unlock();
2073 return 0;
2074
2075 nla_put_failure:
2076 rcu_read_unlock();
2077 return -ENOSPC;
2078 }
2079
2080 static int
2081 ctnetlink_nfqueue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2082 {
2083 int err;
2084
2085 if (cda[CTA_TIMEOUT]) {
2086 err = ctnetlink_change_timeout(ct, cda);
2087 if (err < 0)
2088 return err;
2089 }
2090 if (cda[CTA_STATUS]) {
2091 err = ctnetlink_change_status(ct, cda);
2092 if (err < 0)
2093 return err;
2094 }
2095 if (cda[CTA_HELP]) {
2096 err = ctnetlink_change_helper(ct, cda);
2097 if (err < 0)
2098 return err;
2099 }
2100 if (cda[CTA_LABELS]) {
2101 err = ctnetlink_attach_labels(ct, cda);
2102 if (err < 0)
2103 return err;
2104 }
2105 #if defined(CONFIG_NF_CONNTRACK_MARK)
2106 if (cda[CTA_MARK])
2107 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2108 #endif
2109 return 0;
2110 }
2111
2112 static int
2113 ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
2114 {
2115 struct nlattr *cda[CTA_MAX+1];
2116 int ret;
2117
2118 nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2119
2120 spin_lock_bh(&nf_conntrack_lock);
2121 ret = ctnetlink_nfqueue_parse_ct((const struct nlattr **)cda, ct);
2122 spin_unlock_bh(&nf_conntrack_lock);
2123
2124 return ret;
2125 }
2126
2127 static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
2128 .build_size = ctnetlink_nfqueue_build_size,
2129 .build = ctnetlink_nfqueue_build,
2130 .parse = ctnetlink_nfqueue_parse,
2131 };
2132 #endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
2133
2134 /***********************************************************************
2135 * EXPECT
2136 ***********************************************************************/
2137
2138 static inline int
2139 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2140 const struct nf_conntrack_tuple *tuple,
2141 enum ctattr_expect type)
2142 {
2143 struct nlattr *nest_parms;
2144
2145 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2146 if (!nest_parms)
2147 goto nla_put_failure;
2148 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2149 goto nla_put_failure;
2150 nla_nest_end(skb, nest_parms);
2151
2152 return 0;
2153
2154 nla_put_failure:
2155 return -1;
2156 }
2157
2158 static inline int
2159 ctnetlink_exp_dump_mask(struct sk_buff *skb,
2160 const struct nf_conntrack_tuple *tuple,
2161 const struct nf_conntrack_tuple_mask *mask)
2162 {
2163 int ret;
2164 struct nf_conntrack_l3proto *l3proto;
2165 struct nf_conntrack_l4proto *l4proto;
2166 struct nf_conntrack_tuple m;
2167 struct nlattr *nest_parms;
2168
2169 memset(&m, 0xFF, sizeof(m));
2170 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2171 m.src.u.all = mask->src.u.all;
2172 m.dst.protonum = tuple->dst.protonum;
2173
2174 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2175 if (!nest_parms)
2176 goto nla_put_failure;
2177
2178 rcu_read_lock();
2179 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2180 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2181 if (ret >= 0) {
2182 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2183 tuple->dst.protonum);
2184 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2185 }
2186 rcu_read_unlock();
2187
2188 if (unlikely(ret < 0))
2189 goto nla_put_failure;
2190
2191 nla_nest_end(skb, nest_parms);
2192
2193 return 0;
2194
2195 nla_put_failure:
2196 return -1;
2197 }
2198
2199 static const union nf_inet_addr any_addr;
2200
2201 static int
2202 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2203 const struct nf_conntrack_expect *exp)
2204 {
2205 struct nf_conn *master = exp->master;
2206 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2207 struct nf_conn_help *help;
2208 #ifdef CONFIG_NF_NAT_NEEDED
2209 struct nlattr *nest_parms;
2210 struct nf_conntrack_tuple nat_tuple = {};
2211 #endif
2212 struct nf_ct_helper_expectfn *expfn;
2213
2214 if (timeout < 0)
2215 timeout = 0;
2216
2217 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2218 goto nla_put_failure;
2219 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2220 goto nla_put_failure;
2221 if (ctnetlink_exp_dump_tuple(skb,
2222 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2223 CTA_EXPECT_MASTER) < 0)
2224 goto nla_put_failure;
2225
2226 #ifdef CONFIG_NF_NAT_NEEDED
2227 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2228 exp->saved_proto.all) {
2229 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2230 if (!nest_parms)
2231 goto nla_put_failure;
2232
2233 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2234 goto nla_put_failure;
2235
2236 nat_tuple.src.l3num = nf_ct_l3num(master);
2237 nat_tuple.src.u3 = exp->saved_addr;
2238 nat_tuple.dst.protonum = nf_ct_protonum(master);
2239 nat_tuple.src.u = exp->saved_proto;
2240
2241 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2242 CTA_EXPECT_NAT_TUPLE) < 0)
2243 goto nla_put_failure;
2244 nla_nest_end(skb, nest_parms);
2245 }
2246 #endif
2247 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2248 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2249 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2250 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2251 goto nla_put_failure;
2252 help = nfct_help(master);
2253 if (help) {
2254 struct nf_conntrack_helper *helper;
2255
2256 helper = rcu_dereference(help->helper);
2257 if (helper &&
2258 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2259 goto nla_put_failure;
2260 }
2261 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2262 if (expfn != NULL &&
2263 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2264 goto nla_put_failure;
2265
2266 return 0;
2267
2268 nla_put_failure:
2269 return -1;
2270 }
2271
2272 static int
2273 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2274 int event, const struct nf_conntrack_expect *exp)
2275 {
2276 struct nlmsghdr *nlh;
2277 struct nfgenmsg *nfmsg;
2278 unsigned int flags = portid ? NLM_F_MULTI : 0;
2279
2280 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2281 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2282 if (nlh == NULL)
2283 goto nlmsg_failure;
2284
2285 nfmsg = nlmsg_data(nlh);
2286 nfmsg->nfgen_family = exp->tuple.src.l3num;
2287 nfmsg->version = NFNETLINK_V0;
2288 nfmsg->res_id = 0;
2289
2290 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2291 goto nla_put_failure;
2292
2293 nlmsg_end(skb, nlh);
2294 return skb->len;
2295
2296 nlmsg_failure:
2297 nla_put_failure:
2298 nlmsg_cancel(skb, nlh);
2299 return -1;
2300 }
2301
2302 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2303 static int
2304 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2305 {
2306 struct nf_conntrack_expect *exp = item->exp;
2307 struct net *net = nf_ct_exp_net(exp);
2308 struct nlmsghdr *nlh;
2309 struct nfgenmsg *nfmsg;
2310 struct sk_buff *skb;
2311 unsigned int type, group;
2312 int flags = 0;
2313
2314 if (events & (1 << IPEXP_DESTROY)) {
2315 type = IPCTNL_MSG_EXP_DELETE;
2316 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2317 } else if (events & (1 << IPEXP_NEW)) {
2318 type = IPCTNL_MSG_EXP_NEW;
2319 flags = NLM_F_CREATE|NLM_F_EXCL;
2320 group = NFNLGRP_CONNTRACK_EXP_NEW;
2321 } else
2322 return 0;
2323
2324 if (!item->report && !nfnetlink_has_listeners(net, group))
2325 return 0;
2326
2327 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2328 if (skb == NULL)
2329 goto errout;
2330
2331 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2332 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2333 if (nlh == NULL)
2334 goto nlmsg_failure;
2335
2336 nfmsg = nlmsg_data(nlh);
2337 nfmsg->nfgen_family = exp->tuple.src.l3num;
2338 nfmsg->version = NFNETLINK_V0;
2339 nfmsg->res_id = 0;
2340
2341 rcu_read_lock();
2342 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2343 goto nla_put_failure;
2344 rcu_read_unlock();
2345
2346 nlmsg_end(skb, nlh);
2347 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2348 return 0;
2349
2350 nla_put_failure:
2351 rcu_read_unlock();
2352 nlmsg_cancel(skb, nlh);
2353 nlmsg_failure:
2354 kfree_skb(skb);
2355 errout:
2356 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2357 return 0;
2358 }
2359 #endif
2360 static int ctnetlink_exp_done(struct netlink_callback *cb)
2361 {
2362 if (cb->args[1])
2363 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2364 return 0;
2365 }
2366
2367 static int
2368 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2369 {
2370 struct net *net = sock_net(skb->sk);
2371 struct nf_conntrack_expect *exp, *last;
2372 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2373 struct hlist_node *n;
2374 u_int8_t l3proto = nfmsg->nfgen_family;
2375
2376 rcu_read_lock();
2377 last = (struct nf_conntrack_expect *)cb->args[1];
2378 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2379 restart:
2380 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
2381 hnode) {
2382 if (l3proto && exp->tuple.src.l3num != l3proto)
2383 continue;
2384 if (cb->args[1]) {
2385 if (exp != last)
2386 continue;
2387 cb->args[1] = 0;
2388 }
2389 if (ctnetlink_exp_fill_info(skb,
2390 NETLINK_CB(cb->skb).portid,
2391 cb->nlh->nlmsg_seq,
2392 IPCTNL_MSG_EXP_NEW,
2393 exp) < 0) {
2394 if (!atomic_inc_not_zero(&exp->use))
2395 continue;
2396 cb->args[1] = (unsigned long)exp;
2397 goto out;
2398 }
2399 }
2400 if (cb->args[1]) {
2401 cb->args[1] = 0;
2402 goto restart;
2403 }
2404 }
2405 out:
2406 rcu_read_unlock();
2407 if (last)
2408 nf_ct_expect_put(last);
2409
2410 return skb->len;
2411 }
2412
2413 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2414 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2415 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2416 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2417 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2418 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2419 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2420 .len = NF_CT_HELPER_NAME_LEN - 1 },
2421 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2422 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2423 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2424 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2425 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2426 };
2427
2428 static int
2429 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
2430 const struct nlmsghdr *nlh,
2431 const struct nlattr * const cda[])
2432 {
2433 struct net *net = sock_net(ctnl);
2434 struct nf_conntrack_tuple tuple;
2435 struct nf_conntrack_expect *exp;
2436 struct sk_buff *skb2;
2437 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2438 u_int8_t u3 = nfmsg->nfgen_family;
2439 u16 zone;
2440 int err;
2441
2442 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2443 struct netlink_dump_control c = {
2444 .dump = ctnetlink_exp_dump_table,
2445 .done = ctnetlink_exp_done,
2446 };
2447 return netlink_dump_start(ctnl, skb, nlh, &c);
2448 }
2449
2450 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2451 if (err < 0)
2452 return err;
2453
2454 if (cda[CTA_EXPECT_TUPLE])
2455 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2456 else if (cda[CTA_EXPECT_MASTER])
2457 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2458 else
2459 return -EINVAL;
2460
2461 if (err < 0)
2462 return err;
2463
2464 exp = nf_ct_expect_find_get(net, zone, &tuple);
2465 if (!exp)
2466 return -ENOENT;
2467
2468 if (cda[CTA_EXPECT_ID]) {
2469 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2470 if (ntohl(id) != (u32)(unsigned long)exp) {
2471 nf_ct_expect_put(exp);
2472 return -ENOENT;
2473 }
2474 }
2475
2476 err = -ENOMEM;
2477 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2478 if (skb2 == NULL) {
2479 nf_ct_expect_put(exp);
2480 goto out;
2481 }
2482
2483 rcu_read_lock();
2484 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2485 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2486 rcu_read_unlock();
2487 nf_ct_expect_put(exp);
2488 if (err <= 0)
2489 goto free;
2490
2491 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2492 if (err < 0)
2493 goto out;
2494
2495 return 0;
2496
2497 free:
2498 kfree_skb(skb2);
2499 out:
2500 /* this avoids a loop in nfnetlink. */
2501 return err == -EAGAIN ? -ENOBUFS : err;
2502 }
2503
2504 static int
2505 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
2506 const struct nlmsghdr *nlh,
2507 const struct nlattr * const cda[])
2508 {
2509 struct net *net = sock_net(ctnl);
2510 struct nf_conntrack_expect *exp;
2511 struct nf_conntrack_tuple tuple;
2512 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2513 struct hlist_node *n, *next;
2514 u_int8_t u3 = nfmsg->nfgen_family;
2515 unsigned int i;
2516 u16 zone;
2517 int err;
2518
2519 if (cda[CTA_EXPECT_TUPLE]) {
2520 /* delete a single expect by tuple */
2521 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2522 if (err < 0)
2523 return err;
2524
2525 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2526 if (err < 0)
2527 return err;
2528
2529 /* bump usage count to 2 */
2530 exp = nf_ct_expect_find_get(net, zone, &tuple);
2531 if (!exp)
2532 return -ENOENT;
2533
2534 if (cda[CTA_EXPECT_ID]) {
2535 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2536 if (ntohl(id) != (u32)(unsigned long)exp) {
2537 nf_ct_expect_put(exp);
2538 return -ENOENT;
2539 }
2540 }
2541
2542 /* after list removal, usage count == 1 */
2543 spin_lock_bh(&nf_conntrack_lock);
2544 if (del_timer(&exp->timeout)) {
2545 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2546 nlmsg_report(nlh));
2547 nf_ct_expect_put(exp);
2548 }
2549 spin_unlock_bh(&nf_conntrack_lock);
2550 /* have to put what we 'get' above.
2551 * after this line usage count == 0 */
2552 nf_ct_expect_put(exp);
2553 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2554 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2555 struct nf_conn_help *m_help;
2556
2557 /* delete all expectations for this helper */
2558 spin_lock_bh(&nf_conntrack_lock);
2559 for (i = 0; i < nf_ct_expect_hsize; i++) {
2560 hlist_for_each_entry_safe(exp, n, next,
2561 &net->ct.expect_hash[i],
2562 hnode) {
2563 m_help = nfct_help(exp->master);
2564 if (!strcmp(m_help->helper->name, name) &&
2565 del_timer(&exp->timeout)) {
2566 nf_ct_unlink_expect_report(exp,
2567 NETLINK_CB(skb).portid,
2568 nlmsg_report(nlh));
2569 nf_ct_expect_put(exp);
2570 }
2571 }
2572 }
2573 spin_unlock_bh(&nf_conntrack_lock);
2574 } else {
2575 /* This basically means we have to flush everything*/
2576 spin_lock_bh(&nf_conntrack_lock);
2577 for (i = 0; i < nf_ct_expect_hsize; i++) {
2578 hlist_for_each_entry_safe(exp, n, next,
2579 &net->ct.expect_hash[i],
2580 hnode) {
2581 if (del_timer(&exp->timeout)) {
2582 nf_ct_unlink_expect_report(exp,
2583 NETLINK_CB(skb).portid,
2584 nlmsg_report(nlh));
2585 nf_ct_expect_put(exp);
2586 }
2587 }
2588 }
2589 spin_unlock_bh(&nf_conntrack_lock);
2590 }
2591
2592 return 0;
2593 }
2594 static int
2595 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2596 const struct nlattr * const cda[])
2597 {
2598 if (cda[CTA_EXPECT_TIMEOUT]) {
2599 if (!del_timer(&x->timeout))
2600 return -ETIME;
2601
2602 x->timeout.expires = jiffies +
2603 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2604 add_timer(&x->timeout);
2605 }
2606 return 0;
2607 }
2608
2609 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2610 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2611 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2612 };
2613
2614 static int
2615 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2616 struct nf_conntrack_expect *exp,
2617 u_int8_t u3)
2618 {
2619 #ifdef CONFIG_NF_NAT_NEEDED
2620 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2621 struct nf_conntrack_tuple nat_tuple = {};
2622 int err;
2623
2624 nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2625
2626 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2627 return -EINVAL;
2628
2629 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2630 &nat_tuple, CTA_EXPECT_NAT_TUPLE, u3);
2631 if (err < 0)
2632 return err;
2633
2634 exp->saved_addr = nat_tuple.src.u3;
2635 exp->saved_proto = nat_tuple.src.u;
2636 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2637
2638 return 0;
2639 #else
2640 return -EOPNOTSUPP;
2641 #endif
2642 }
2643
2644 static int
2645 ctnetlink_create_expect(struct net *net, u16 zone,
2646 const struct nlattr * const cda[],
2647 u_int8_t u3,
2648 u32 portid, int report)
2649 {
2650 struct nf_conntrack_tuple tuple, mask, master_tuple;
2651 struct nf_conntrack_tuple_hash *h = NULL;
2652 struct nf_conntrack_expect *exp;
2653 struct nf_conn *ct;
2654 struct nf_conn_help *help;
2655 struct nf_conntrack_helper *helper = NULL;
2656 u_int32_t class = 0;
2657 int err = 0;
2658
2659 /* caller guarantees that those three CTA_EXPECT_* exist */
2660 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2661 if (err < 0)
2662 return err;
2663 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2664 if (err < 0)
2665 return err;
2666 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2667 if (err < 0)
2668 return err;
2669
2670 /* Look for master conntrack of this expectation */
2671 h = nf_conntrack_find_get(net, zone, &master_tuple);
2672 if (!h)
2673 return -ENOENT;
2674 ct = nf_ct_tuplehash_to_ctrack(h);
2675
2676 /* Look for helper of this expectation */
2677 if (cda[CTA_EXPECT_HELP_NAME]) {
2678 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2679
2680 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2681 nf_ct_protonum(ct));
2682 if (helper == NULL) {
2683 #ifdef CONFIG_MODULES
2684 if (request_module("nfct-helper-%s", helpname) < 0) {
2685 err = -EOPNOTSUPP;
2686 goto out;
2687 }
2688
2689 helper = __nf_conntrack_helper_find(helpname,
2690 nf_ct_l3num(ct),
2691 nf_ct_protonum(ct));
2692 if (helper) {
2693 err = -EAGAIN;
2694 goto out;
2695 }
2696 #endif
2697 err = -EOPNOTSUPP;
2698 goto out;
2699 }
2700 }
2701
2702 if (cda[CTA_EXPECT_CLASS] && helper) {
2703 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
2704 if (class > helper->expect_class_max) {
2705 err = -EINVAL;
2706 goto out;
2707 }
2708 }
2709 exp = nf_ct_expect_alloc(ct);
2710 if (!exp) {
2711 err = -ENOMEM;
2712 goto out;
2713 }
2714 help = nfct_help(ct);
2715 if (!help) {
2716 if (!cda[CTA_EXPECT_TIMEOUT]) {
2717 err = -EINVAL;
2718 goto err_out;
2719 }
2720 exp->timeout.expires =
2721 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2722
2723 exp->flags = NF_CT_EXPECT_USERSPACE;
2724 if (cda[CTA_EXPECT_FLAGS]) {
2725 exp->flags |=
2726 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2727 }
2728 } else {
2729 if (cda[CTA_EXPECT_FLAGS]) {
2730 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2731 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2732 } else
2733 exp->flags = 0;
2734 }
2735 if (cda[CTA_EXPECT_FN]) {
2736 const char *name = nla_data(cda[CTA_EXPECT_FN]);
2737 struct nf_ct_helper_expectfn *expfn;
2738
2739 expfn = nf_ct_helper_expectfn_find_by_name(name);
2740 if (expfn == NULL) {
2741 err = -EINVAL;
2742 goto err_out;
2743 }
2744 exp->expectfn = expfn->expectfn;
2745 } else
2746 exp->expectfn = NULL;
2747
2748 exp->class = class;
2749 exp->master = ct;
2750 exp->helper = helper;
2751 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2752 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2753 exp->mask.src.u.all = mask.src.u.all;
2754
2755 if (cda[CTA_EXPECT_NAT]) {
2756 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
2757 exp, u3);
2758 if (err < 0)
2759 goto err_out;
2760 }
2761 err = nf_ct_expect_related_report(exp, portid, report);
2762 err_out:
2763 nf_ct_expect_put(exp);
2764 out:
2765 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2766 return err;
2767 }
2768
2769 static int
2770 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2771 const struct nlmsghdr *nlh,
2772 const struct nlattr * const cda[])
2773 {
2774 struct net *net = sock_net(ctnl);
2775 struct nf_conntrack_tuple tuple;
2776 struct nf_conntrack_expect *exp;
2777 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2778 u_int8_t u3 = nfmsg->nfgen_family;
2779 u16 zone;
2780 int err;
2781
2782 if (!cda[CTA_EXPECT_TUPLE]
2783 || !cda[CTA_EXPECT_MASK]
2784 || !cda[CTA_EXPECT_MASTER])
2785 return -EINVAL;
2786
2787 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2788 if (err < 0)
2789 return err;
2790
2791 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2792 if (err < 0)
2793 return err;
2794
2795 spin_lock_bh(&nf_conntrack_lock);
2796 exp = __nf_ct_expect_find(net, zone, &tuple);
2797
2798 if (!exp) {
2799 spin_unlock_bh(&nf_conntrack_lock);
2800 err = -ENOENT;
2801 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2802 err = ctnetlink_create_expect(net, zone, cda,
2803 u3,
2804 NETLINK_CB(skb).portid,
2805 nlmsg_report(nlh));
2806 }
2807 return err;
2808 }
2809
2810 err = -EEXIST;
2811 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2812 err = ctnetlink_change_expect(exp, cda);
2813 spin_unlock_bh(&nf_conntrack_lock);
2814
2815 return err;
2816 }
2817
2818 static int
2819 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
2820 const struct ip_conntrack_stat *st)
2821 {
2822 struct nlmsghdr *nlh;
2823 struct nfgenmsg *nfmsg;
2824 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2825
2826 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
2827 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2828 if (nlh == NULL)
2829 goto nlmsg_failure;
2830
2831 nfmsg = nlmsg_data(nlh);
2832 nfmsg->nfgen_family = AF_UNSPEC;
2833 nfmsg->version = NFNETLINK_V0;
2834 nfmsg->res_id = htons(cpu);
2835
2836 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
2837 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
2838 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
2839 goto nla_put_failure;
2840
2841 nlmsg_end(skb, nlh);
2842 return skb->len;
2843
2844 nla_put_failure:
2845 nlmsg_failure:
2846 nlmsg_cancel(skb, nlh);
2847 return -1;
2848 }
2849
2850 static int
2851 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2852 {
2853 int cpu;
2854 struct net *net = sock_net(skb->sk);
2855
2856 if (cb->args[0] == nr_cpu_ids)
2857 return 0;
2858
2859 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2860 const struct ip_conntrack_stat *st;
2861
2862 if (!cpu_possible(cpu))
2863 continue;
2864
2865 st = per_cpu_ptr(net->ct.stat, cpu);
2866 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
2867 cb->nlh->nlmsg_seq,
2868 cpu, st) < 0)
2869 break;
2870 }
2871 cb->args[0] = cpu;
2872
2873 return skb->len;
2874 }
2875
2876 static int
2877 ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
2878 const struct nlmsghdr *nlh,
2879 const struct nlattr * const cda[])
2880 {
2881 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2882 struct netlink_dump_control c = {
2883 .dump = ctnetlink_exp_stat_cpu_dump,
2884 };
2885 return netlink_dump_start(ctnl, skb, nlh, &c);
2886 }
2887
2888 return 0;
2889 }
2890
2891 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2892 static struct nf_ct_event_notifier ctnl_notifier = {
2893 .fcn = ctnetlink_conntrack_event,
2894 };
2895
2896 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2897 .fcn = ctnetlink_expect_event,
2898 };
2899 #endif
2900
2901 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2902 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2903 .attr_count = CTA_MAX,
2904 .policy = ct_nla_policy },
2905 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2906 .attr_count = CTA_MAX,
2907 .policy = ct_nla_policy },
2908 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2909 .attr_count = CTA_MAX,
2910 .policy = ct_nla_policy },
2911 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2912 .attr_count = CTA_MAX,
2913 .policy = ct_nla_policy },
2914 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
2915 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
2916 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
2917 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
2918 };
2919
2920 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2921 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2922 .attr_count = CTA_EXPECT_MAX,
2923 .policy = exp_nla_policy },
2924 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2925 .attr_count = CTA_EXPECT_MAX,
2926 .policy = exp_nla_policy },
2927 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2928 .attr_count = CTA_EXPECT_MAX,
2929 .policy = exp_nla_policy },
2930 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
2931 };
2932
2933 static const struct nfnetlink_subsystem ctnl_subsys = {
2934 .name = "conntrack",
2935 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2936 .cb_count = IPCTNL_MSG_MAX,
2937 .cb = ctnl_cb,
2938 };
2939
2940 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2941 .name = "conntrack_expect",
2942 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2943 .cb_count = IPCTNL_MSG_EXP_MAX,
2944 .cb = ctnl_exp_cb,
2945 };
2946
2947 MODULE_ALIAS("ip_conntrack_netlink");
2948 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2949 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2950
2951 static int __net_init ctnetlink_net_init(struct net *net)
2952 {
2953 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2954 int ret;
2955
2956 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
2957 if (ret < 0) {
2958 pr_err("ctnetlink_init: cannot register notifier.\n");
2959 goto err_out;
2960 }
2961
2962 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
2963 if (ret < 0) {
2964 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2965 goto err_unreg_notifier;
2966 }
2967 #endif
2968 return 0;
2969
2970 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2971 err_unreg_notifier:
2972 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2973 err_out:
2974 return ret;
2975 #endif
2976 }
2977
2978 static void ctnetlink_net_exit(struct net *net)
2979 {
2980 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2981 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
2982 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2983 #endif
2984 }
2985
2986 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
2987 {
2988 struct net *net;
2989
2990 list_for_each_entry(net, net_exit_list, exit_list)
2991 ctnetlink_net_exit(net);
2992 }
2993
2994 static struct pernet_operations ctnetlink_net_ops = {
2995 .init = ctnetlink_net_init,
2996 .exit_batch = ctnetlink_net_exit_batch,
2997 };
2998
2999 static int __init ctnetlink_init(void)
3000 {
3001 int ret;
3002
3003 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3004 ret = nfnetlink_subsys_register(&ctnl_subsys);
3005 if (ret < 0) {
3006 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3007 goto err_out;
3008 }
3009
3010 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3011 if (ret < 0) {
3012 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3013 goto err_unreg_subsys;
3014 }
3015
3016 ret = register_pernet_subsys(&ctnetlink_net_ops);
3017 if (ret < 0) {
3018 pr_err("ctnetlink_init: cannot register pernet operations\n");
3019 goto err_unreg_exp_subsys;
3020 }
3021 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3022 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3023 RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
3024 #endif
3025 return 0;
3026
3027 err_unreg_exp_subsys:
3028 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3029 err_unreg_subsys:
3030 nfnetlink_subsys_unregister(&ctnl_subsys);
3031 err_out:
3032 return ret;
3033 }
3034
3035 static void __exit ctnetlink_exit(void)
3036 {
3037 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3038
3039 unregister_pernet_subsys(&ctnetlink_net_ops);
3040 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3041 nfnetlink_subsys_unregister(&ctnl_subsys);
3042 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3043 RCU_INIT_POINTER(nfq_ct_hook, NULL);
3044 #endif
3045 }
3046
3047 module_init(ctnetlink_init);
3048 module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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