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netfilter: nf_conntrack: add direction support for zones
[mirror_ubuntu-artful-kernel.git] / net / netfilter / nf_conntrack_netlink.c
1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/security.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
32
33 #include <linux/netfilter.h>
34 #include <net/netlink.h>
35 #include <net/sock.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_core.h>
38 #include <net/netfilter/nf_conntrack_expect.h>
39 #include <net/netfilter/nf_conntrack_helper.h>
40 #include <net/netfilter/nf_conntrack_seqadj.h>
41 #include <net/netfilter/nf_conntrack_l3proto.h>
42 #include <net/netfilter/nf_conntrack_l4proto.h>
43 #include <net/netfilter/nf_conntrack_tuple.h>
44 #include <net/netfilter/nf_conntrack_acct.h>
45 #include <net/netfilter/nf_conntrack_zones.h>
46 #include <net/netfilter/nf_conntrack_timestamp.h>
47 #include <net/netfilter/nf_conntrack_labels.h>
48 #ifdef CONFIG_NF_NAT_NEEDED
49 #include <net/netfilter/nf_nat_core.h>
50 #include <net/netfilter/nf_nat_l4proto.h>
51 #include <net/netfilter/nf_nat_helper.h>
52 #endif
53
54 #include <linux/netfilter/nfnetlink.h>
55 #include <linux/netfilter/nfnetlink_conntrack.h>
56
57 MODULE_LICENSE("GPL");
58
59 static char __initdata version[] = "0.93";
60
61 static inline int
62 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
63 const struct nf_conntrack_tuple *tuple,
64 struct nf_conntrack_l4proto *l4proto)
65 {
66 int ret = 0;
67 struct nlattr *nest_parms;
68
69 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
70 if (!nest_parms)
71 goto nla_put_failure;
72 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
73 goto nla_put_failure;
74
75 if (likely(l4proto->tuple_to_nlattr))
76 ret = l4proto->tuple_to_nlattr(skb, tuple);
77
78 nla_nest_end(skb, nest_parms);
79
80 return ret;
81
82 nla_put_failure:
83 return -1;
84 }
85
86 static inline int
87 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
88 const struct nf_conntrack_tuple *tuple,
89 struct nf_conntrack_l3proto *l3proto)
90 {
91 int ret = 0;
92 struct nlattr *nest_parms;
93
94 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
95 if (!nest_parms)
96 goto nla_put_failure;
97
98 if (likely(l3proto->tuple_to_nlattr))
99 ret = l3proto->tuple_to_nlattr(skb, tuple);
100
101 nla_nest_end(skb, nest_parms);
102
103 return ret;
104
105 nla_put_failure:
106 return -1;
107 }
108
109 static int
110 ctnetlink_dump_tuples(struct sk_buff *skb,
111 const struct nf_conntrack_tuple *tuple)
112 {
113 int ret;
114 struct nf_conntrack_l3proto *l3proto;
115 struct nf_conntrack_l4proto *l4proto;
116
117 rcu_read_lock();
118 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
119 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
120
121 if (ret >= 0) {
122 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
123 tuple->dst.protonum);
124 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
125 }
126 rcu_read_unlock();
127 return ret;
128 }
129
130 static inline int
131 ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
132 const struct nf_conntrack_zone *zone, int dir)
133 {
134 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
135 return 0;
136 if (nla_put_be16(skb, attrtype, htons(zone->id)))
137 goto nla_put_failure;
138 return 0;
139
140 nla_put_failure:
141 return -1;
142 }
143
144 static inline int
145 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
146 {
147 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
148 goto nla_put_failure;
149 return 0;
150
151 nla_put_failure:
152 return -1;
153 }
154
155 static inline int
156 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
157 {
158 long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
159
160 if (timeout < 0)
161 timeout = 0;
162
163 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
164 goto nla_put_failure;
165 return 0;
166
167 nla_put_failure:
168 return -1;
169 }
170
171 static inline int
172 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
173 {
174 struct nf_conntrack_l4proto *l4proto;
175 struct nlattr *nest_proto;
176 int ret;
177
178 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
179 if (!l4proto->to_nlattr)
180 return 0;
181
182 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
183 if (!nest_proto)
184 goto nla_put_failure;
185
186 ret = l4proto->to_nlattr(skb, nest_proto, ct);
187
188 nla_nest_end(skb, nest_proto);
189
190 return ret;
191
192 nla_put_failure:
193 return -1;
194 }
195
196 static inline int
197 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
198 {
199 struct nlattr *nest_helper;
200 const struct nf_conn_help *help = nfct_help(ct);
201 struct nf_conntrack_helper *helper;
202
203 if (!help)
204 return 0;
205
206 helper = rcu_dereference(help->helper);
207 if (!helper)
208 goto out;
209
210 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
211 if (!nest_helper)
212 goto nla_put_failure;
213 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
214 goto nla_put_failure;
215
216 if (helper->to_nlattr)
217 helper->to_nlattr(skb, ct);
218
219 nla_nest_end(skb, nest_helper);
220 out:
221 return 0;
222
223 nla_put_failure:
224 return -1;
225 }
226
227 static int
228 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
229 enum ip_conntrack_dir dir, int type)
230 {
231 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
232 struct nf_conn_counter *counter = acct->counter;
233 struct nlattr *nest_count;
234 u64 pkts, bytes;
235
236 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
237 pkts = atomic64_xchg(&counter[dir].packets, 0);
238 bytes = atomic64_xchg(&counter[dir].bytes, 0);
239 } else {
240 pkts = atomic64_read(&counter[dir].packets);
241 bytes = atomic64_read(&counter[dir].bytes);
242 }
243
244 nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
245 if (!nest_count)
246 goto nla_put_failure;
247
248 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts)) ||
249 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes)))
250 goto nla_put_failure;
251
252 nla_nest_end(skb, nest_count);
253
254 return 0;
255
256 nla_put_failure:
257 return -1;
258 }
259
260 static int
261 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
262 {
263 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
264
265 if (!acct)
266 return 0;
267
268 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
269 return -1;
270 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
271 return -1;
272
273 return 0;
274 }
275
276 static int
277 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
278 {
279 struct nlattr *nest_count;
280 const struct nf_conn_tstamp *tstamp;
281
282 tstamp = nf_conn_tstamp_find(ct);
283 if (!tstamp)
284 return 0;
285
286 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
287 if (!nest_count)
288 goto nla_put_failure;
289
290 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start)) ||
291 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
292 cpu_to_be64(tstamp->stop))))
293 goto nla_put_failure;
294 nla_nest_end(skb, nest_count);
295
296 return 0;
297
298 nla_put_failure:
299 return -1;
300 }
301
302 #ifdef CONFIG_NF_CONNTRACK_MARK
303 static inline int
304 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
305 {
306 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
307 goto nla_put_failure;
308 return 0;
309
310 nla_put_failure:
311 return -1;
312 }
313 #else
314 #define ctnetlink_dump_mark(a, b) (0)
315 #endif
316
317 #ifdef CONFIG_NF_CONNTRACK_SECMARK
318 static inline int
319 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
320 {
321 struct nlattr *nest_secctx;
322 int len, ret;
323 char *secctx;
324
325 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
326 if (ret)
327 return 0;
328
329 ret = -1;
330 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
331 if (!nest_secctx)
332 goto nla_put_failure;
333
334 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
335 goto nla_put_failure;
336 nla_nest_end(skb, nest_secctx);
337
338 ret = 0;
339 nla_put_failure:
340 security_release_secctx(secctx, len);
341 return ret;
342 }
343 #else
344 #define ctnetlink_dump_secctx(a, b) (0)
345 #endif
346
347 #ifdef CONFIG_NF_CONNTRACK_LABELS
348 static int ctnetlink_label_size(const struct nf_conn *ct)
349 {
350 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
351
352 if (!labels)
353 return 0;
354 return nla_total_size(labels->words * sizeof(long));
355 }
356
357 static int
358 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
359 {
360 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
361 unsigned int len, i;
362
363 if (!labels)
364 return 0;
365
366 len = labels->words * sizeof(long);
367 i = 0;
368 do {
369 if (labels->bits[i] != 0)
370 return nla_put(skb, CTA_LABELS, len, labels->bits);
371 i++;
372 } while (i < labels->words);
373
374 return 0;
375 }
376 #else
377 #define ctnetlink_dump_labels(a, b) (0)
378 #define ctnetlink_label_size(a) (0)
379 #endif
380
381 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
382
383 static inline int
384 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
385 {
386 struct nlattr *nest_parms;
387
388 if (!(ct->status & IPS_EXPECTED))
389 return 0;
390
391 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
392 if (!nest_parms)
393 goto nla_put_failure;
394 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
395 goto nla_put_failure;
396 nla_nest_end(skb, nest_parms);
397
398 return 0;
399
400 nla_put_failure:
401 return -1;
402 }
403
404 static int
405 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
406 {
407 struct nlattr *nest_parms;
408
409 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
410 if (!nest_parms)
411 goto nla_put_failure;
412
413 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
414 htonl(seq->correction_pos)) ||
415 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
416 htonl(seq->offset_before)) ||
417 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
418 htonl(seq->offset_after)))
419 goto nla_put_failure;
420
421 nla_nest_end(skb, nest_parms);
422
423 return 0;
424
425 nla_put_failure:
426 return -1;
427 }
428
429 static inline int
430 ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
431 {
432 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
433 struct nf_ct_seqadj *seq;
434
435 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
436 return 0;
437
438 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
439 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
440 return -1;
441
442 seq = &seqadj->seq[IP_CT_DIR_REPLY];
443 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
444 return -1;
445
446 return 0;
447 }
448
449 static inline int
450 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
451 {
452 if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
453 goto nla_put_failure;
454 return 0;
455
456 nla_put_failure:
457 return -1;
458 }
459
460 static inline int
461 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
462 {
463 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
464 goto nla_put_failure;
465 return 0;
466
467 nla_put_failure:
468 return -1;
469 }
470
471 static int
472 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
473 struct nf_conn *ct)
474 {
475 const struct nf_conntrack_zone *zone;
476 struct nlmsghdr *nlh;
477 struct nfgenmsg *nfmsg;
478 struct nlattr *nest_parms;
479 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
480
481 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
482 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
483 if (nlh == NULL)
484 goto nlmsg_failure;
485
486 nfmsg = nlmsg_data(nlh);
487 nfmsg->nfgen_family = nf_ct_l3num(ct);
488 nfmsg->version = NFNETLINK_V0;
489 nfmsg->res_id = 0;
490
491 zone = nf_ct_zone(ct);
492
493 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
494 if (!nest_parms)
495 goto nla_put_failure;
496 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
497 goto nla_put_failure;
498 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
499 NF_CT_ZONE_DIR_ORIG) < 0)
500 goto nla_put_failure;
501 nla_nest_end(skb, nest_parms);
502
503 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
504 if (!nest_parms)
505 goto nla_put_failure;
506 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
507 goto nla_put_failure;
508 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
509 NF_CT_ZONE_DIR_REPL) < 0)
510 goto nla_put_failure;
511 nla_nest_end(skb, nest_parms);
512
513 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
514 NF_CT_DEFAULT_ZONE_DIR) < 0)
515 goto nla_put_failure;
516
517 if (ctnetlink_dump_status(skb, ct) < 0 ||
518 ctnetlink_dump_timeout(skb, ct) < 0 ||
519 ctnetlink_dump_acct(skb, ct, type) < 0 ||
520 ctnetlink_dump_timestamp(skb, ct) < 0 ||
521 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
522 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
523 ctnetlink_dump_mark(skb, ct) < 0 ||
524 ctnetlink_dump_secctx(skb, ct) < 0 ||
525 ctnetlink_dump_labels(skb, ct) < 0 ||
526 ctnetlink_dump_id(skb, ct) < 0 ||
527 ctnetlink_dump_use(skb, ct) < 0 ||
528 ctnetlink_dump_master(skb, ct) < 0 ||
529 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
530 goto nla_put_failure;
531
532 nlmsg_end(skb, nlh);
533 return skb->len;
534
535 nlmsg_failure:
536 nla_put_failure:
537 nlmsg_cancel(skb, nlh);
538 return -1;
539 }
540
541 static inline size_t
542 ctnetlink_proto_size(const struct nf_conn *ct)
543 {
544 struct nf_conntrack_l3proto *l3proto;
545 struct nf_conntrack_l4proto *l4proto;
546 size_t len = 0;
547
548 rcu_read_lock();
549 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
550 len += l3proto->nla_size;
551
552 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
553 len += l4proto->nla_size;
554 rcu_read_unlock();
555
556 return len;
557 }
558
559 static inline size_t
560 ctnetlink_acct_size(const struct nf_conn *ct)
561 {
562 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
563 return 0;
564 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
565 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
566 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
567 ;
568 }
569
570 static inline int
571 ctnetlink_secctx_size(const struct nf_conn *ct)
572 {
573 #ifdef CONFIG_NF_CONNTRACK_SECMARK
574 int len, ret;
575
576 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
577 if (ret)
578 return 0;
579
580 return nla_total_size(0) /* CTA_SECCTX */
581 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
582 #else
583 return 0;
584 #endif
585 }
586
587 static inline size_t
588 ctnetlink_timestamp_size(const struct nf_conn *ct)
589 {
590 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
591 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
592 return 0;
593 return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
594 #else
595 return 0;
596 #endif
597 }
598
599 static inline size_t
600 ctnetlink_nlmsg_size(const struct nf_conn *ct)
601 {
602 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
603 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
604 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
605 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
606 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
607 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
608 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
609 + ctnetlink_acct_size(ct)
610 + ctnetlink_timestamp_size(ct)
611 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
612 + nla_total_size(0) /* CTA_PROTOINFO */
613 + nla_total_size(0) /* CTA_HELP */
614 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
615 + ctnetlink_secctx_size(ct)
616 #ifdef CONFIG_NF_NAT_NEEDED
617 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
618 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
619 #endif
620 #ifdef CONFIG_NF_CONNTRACK_MARK
621 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
622 #endif
623 #ifdef CONFIG_NF_CONNTRACK_ZONES
624 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
625 #endif
626 + ctnetlink_proto_size(ct)
627 + ctnetlink_label_size(ct)
628 ;
629 }
630
631 #ifdef CONFIG_NF_CONNTRACK_EVENTS
632 static int
633 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
634 {
635 const struct nf_conntrack_zone *zone;
636 struct net *net;
637 struct nlmsghdr *nlh;
638 struct nfgenmsg *nfmsg;
639 struct nlattr *nest_parms;
640 struct nf_conn *ct = item->ct;
641 struct sk_buff *skb;
642 unsigned int type;
643 unsigned int flags = 0, group;
644 int err;
645
646 /* ignore our fake conntrack entry */
647 if (nf_ct_is_untracked(ct))
648 return 0;
649
650 if (events & (1 << IPCT_DESTROY)) {
651 type = IPCTNL_MSG_CT_DELETE;
652 group = NFNLGRP_CONNTRACK_DESTROY;
653 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
654 type = IPCTNL_MSG_CT_NEW;
655 flags = NLM_F_CREATE|NLM_F_EXCL;
656 group = NFNLGRP_CONNTRACK_NEW;
657 } else if (events) {
658 type = IPCTNL_MSG_CT_NEW;
659 group = NFNLGRP_CONNTRACK_UPDATE;
660 } else
661 return 0;
662
663 net = nf_ct_net(ct);
664 if (!item->report && !nfnetlink_has_listeners(net, group))
665 return 0;
666
667 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
668 if (skb == NULL)
669 goto errout;
670
671 type |= NFNL_SUBSYS_CTNETLINK << 8;
672 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
673 if (nlh == NULL)
674 goto nlmsg_failure;
675
676 nfmsg = nlmsg_data(nlh);
677 nfmsg->nfgen_family = nf_ct_l3num(ct);
678 nfmsg->version = NFNETLINK_V0;
679 nfmsg->res_id = 0;
680
681 rcu_read_lock();
682 zone = nf_ct_zone(ct);
683
684 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
685 if (!nest_parms)
686 goto nla_put_failure;
687 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
688 goto nla_put_failure;
689 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
690 NF_CT_ZONE_DIR_ORIG) < 0)
691 goto nla_put_failure;
692 nla_nest_end(skb, nest_parms);
693
694 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
695 if (!nest_parms)
696 goto nla_put_failure;
697 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
698 goto nla_put_failure;
699 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
700 NF_CT_ZONE_DIR_REPL) < 0)
701 goto nla_put_failure;
702 nla_nest_end(skb, nest_parms);
703
704 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
705 NF_CT_DEFAULT_ZONE_DIR) < 0)
706 goto nla_put_failure;
707
708 if (ctnetlink_dump_id(skb, ct) < 0)
709 goto nla_put_failure;
710
711 if (ctnetlink_dump_status(skb, ct) < 0)
712 goto nla_put_failure;
713
714 if (events & (1 << IPCT_DESTROY)) {
715 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
716 ctnetlink_dump_timestamp(skb, ct) < 0)
717 goto nla_put_failure;
718 } else {
719 if (ctnetlink_dump_timeout(skb, ct) < 0)
720 goto nla_put_failure;
721
722 if (events & (1 << IPCT_PROTOINFO)
723 && ctnetlink_dump_protoinfo(skb, ct) < 0)
724 goto nla_put_failure;
725
726 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
727 && ctnetlink_dump_helpinfo(skb, ct) < 0)
728 goto nla_put_failure;
729
730 #ifdef CONFIG_NF_CONNTRACK_SECMARK
731 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
732 && ctnetlink_dump_secctx(skb, ct) < 0)
733 goto nla_put_failure;
734 #endif
735 if (events & (1 << IPCT_LABEL) &&
736 ctnetlink_dump_labels(skb, ct) < 0)
737 goto nla_put_failure;
738
739 if (events & (1 << IPCT_RELATED) &&
740 ctnetlink_dump_master(skb, ct) < 0)
741 goto nla_put_failure;
742
743 if (events & (1 << IPCT_SEQADJ) &&
744 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
745 goto nla_put_failure;
746 }
747
748 #ifdef CONFIG_NF_CONNTRACK_MARK
749 if ((events & (1 << IPCT_MARK) || ct->mark)
750 && ctnetlink_dump_mark(skb, ct) < 0)
751 goto nla_put_failure;
752 #endif
753 rcu_read_unlock();
754
755 nlmsg_end(skb, nlh);
756 err = nfnetlink_send(skb, net, item->portid, group, item->report,
757 GFP_ATOMIC);
758 if (err == -ENOBUFS || err == -EAGAIN)
759 return -ENOBUFS;
760
761 return 0;
762
763 nla_put_failure:
764 rcu_read_unlock();
765 nlmsg_cancel(skb, nlh);
766 nlmsg_failure:
767 kfree_skb(skb);
768 errout:
769 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
770 return -ENOBUFS;
771
772 return 0;
773 }
774 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
775
776 static int ctnetlink_done(struct netlink_callback *cb)
777 {
778 if (cb->args[1])
779 nf_ct_put((struct nf_conn *)cb->args[1]);
780 kfree(cb->data);
781 return 0;
782 }
783
784 struct ctnetlink_filter {
785 struct {
786 u_int32_t val;
787 u_int32_t mask;
788 } mark;
789 };
790
791 static struct ctnetlink_filter *
792 ctnetlink_alloc_filter(const struct nlattr * const cda[])
793 {
794 #ifdef CONFIG_NF_CONNTRACK_MARK
795 struct ctnetlink_filter *filter;
796
797 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
798 if (filter == NULL)
799 return ERR_PTR(-ENOMEM);
800
801 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
802 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
803
804 return filter;
805 #else
806 return ERR_PTR(-EOPNOTSUPP);
807 #endif
808 }
809
810 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
811 {
812 struct ctnetlink_filter *filter = data;
813
814 if (filter == NULL)
815 return 1;
816
817 #ifdef CONFIG_NF_CONNTRACK_MARK
818 if ((ct->mark & filter->mark.mask) == filter->mark.val)
819 return 1;
820 #endif
821
822 return 0;
823 }
824
825 static int
826 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
827 {
828 struct net *net = sock_net(skb->sk);
829 struct nf_conn *ct, *last;
830 struct nf_conntrack_tuple_hash *h;
831 struct hlist_nulls_node *n;
832 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
833 u_int8_t l3proto = nfmsg->nfgen_family;
834 int res;
835 spinlock_t *lockp;
836
837 last = (struct nf_conn *)cb->args[1];
838
839 local_bh_disable();
840 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
841 restart:
842 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
843 spin_lock(lockp);
844 if (cb->args[0] >= net->ct.htable_size) {
845 spin_unlock(lockp);
846 goto out;
847 }
848 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
849 hnnode) {
850 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
851 continue;
852 ct = nf_ct_tuplehash_to_ctrack(h);
853 /* Dump entries of a given L3 protocol number.
854 * If it is not specified, ie. l3proto == 0,
855 * then dump everything. */
856 if (l3proto && nf_ct_l3num(ct) != l3proto)
857 continue;
858 if (cb->args[1]) {
859 if (ct != last)
860 continue;
861 cb->args[1] = 0;
862 }
863 if (!ctnetlink_filter_match(ct, cb->data))
864 continue;
865
866 rcu_read_lock();
867 res =
868 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
869 cb->nlh->nlmsg_seq,
870 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
871 ct);
872 rcu_read_unlock();
873 if (res < 0) {
874 nf_conntrack_get(&ct->ct_general);
875 cb->args[1] = (unsigned long)ct;
876 spin_unlock(lockp);
877 goto out;
878 }
879 }
880 spin_unlock(lockp);
881 if (cb->args[1]) {
882 cb->args[1] = 0;
883 goto restart;
884 }
885 }
886 out:
887 local_bh_enable();
888 if (last)
889 nf_ct_put(last);
890
891 return skb->len;
892 }
893
894 static inline int
895 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
896 {
897 struct nlattr *tb[CTA_IP_MAX+1];
898 struct nf_conntrack_l3proto *l3proto;
899 int ret = 0;
900
901 ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
902 if (ret < 0)
903 return ret;
904
905 rcu_read_lock();
906 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
907
908 if (likely(l3proto->nlattr_to_tuple)) {
909 ret = nla_validate_nested(attr, CTA_IP_MAX,
910 l3proto->nla_policy);
911 if (ret == 0)
912 ret = l3proto->nlattr_to_tuple(tb, tuple);
913 }
914
915 rcu_read_unlock();
916
917 return ret;
918 }
919
920 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
921 [CTA_PROTO_NUM] = { .type = NLA_U8 },
922 };
923
924 static inline int
925 ctnetlink_parse_tuple_proto(struct nlattr *attr,
926 struct nf_conntrack_tuple *tuple)
927 {
928 struct nlattr *tb[CTA_PROTO_MAX+1];
929 struct nf_conntrack_l4proto *l4proto;
930 int ret = 0;
931
932 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
933 if (ret < 0)
934 return ret;
935
936 if (!tb[CTA_PROTO_NUM])
937 return -EINVAL;
938 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
939
940 rcu_read_lock();
941 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
942
943 if (likely(l4proto->nlattr_to_tuple)) {
944 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
945 l4proto->nla_policy);
946 if (ret == 0)
947 ret = l4proto->nlattr_to_tuple(tb, tuple);
948 }
949
950 rcu_read_unlock();
951
952 return ret;
953 }
954
955 static int
956 ctnetlink_parse_zone(const struct nlattr *attr,
957 struct nf_conntrack_zone *zone)
958 {
959 zone->id = NF_CT_DEFAULT_ZONE_ID;
960 zone->dir = NF_CT_DEFAULT_ZONE_DIR;
961
962 #ifdef CONFIG_NF_CONNTRACK_ZONES
963 if (attr)
964 zone->id = ntohs(nla_get_be16(attr));
965 #else
966 if (attr)
967 return -EOPNOTSUPP;
968 #endif
969 return 0;
970 }
971
972 static int
973 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
974 struct nf_conntrack_zone *zone)
975 {
976 int ret;
977
978 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
979 return -EINVAL;
980
981 ret = ctnetlink_parse_zone(attr, zone);
982 if (ret < 0)
983 return ret;
984
985 if (type == CTA_TUPLE_REPLY)
986 zone->dir = NF_CT_ZONE_DIR_REPL;
987 else
988 zone->dir = NF_CT_ZONE_DIR_ORIG;
989
990 return 0;
991 }
992
993 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
994 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
995 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
996 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
997 };
998
999 static int
1000 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1001 struct nf_conntrack_tuple *tuple,
1002 enum ctattr_type type, u_int8_t l3num,
1003 struct nf_conntrack_zone *zone)
1004 {
1005 struct nlattr *tb[CTA_TUPLE_MAX+1];
1006 int err;
1007
1008 memset(tuple, 0, sizeof(*tuple));
1009
1010 err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
1011 if (err < 0)
1012 return err;
1013
1014 if (!tb[CTA_TUPLE_IP])
1015 return -EINVAL;
1016
1017 tuple->src.l3num = l3num;
1018
1019 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
1020 if (err < 0)
1021 return err;
1022
1023 if (!tb[CTA_TUPLE_PROTO])
1024 return -EINVAL;
1025
1026 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
1027 if (err < 0)
1028 return err;
1029
1030 if (tb[CTA_TUPLE_ZONE]) {
1031 if (!zone)
1032 return -EINVAL;
1033
1034 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1035 type, zone);
1036 if (err < 0)
1037 return err;
1038 }
1039
1040 /* orig and expect tuples get DIR_ORIGINAL */
1041 if (type == CTA_TUPLE_REPLY)
1042 tuple->dst.dir = IP_CT_DIR_REPLY;
1043 else
1044 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1045
1046 return 0;
1047 }
1048
1049 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1050 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1051 .len = NF_CT_HELPER_NAME_LEN - 1 },
1052 };
1053
1054 static inline int
1055 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1056 struct nlattr **helpinfo)
1057 {
1058 int err;
1059 struct nlattr *tb[CTA_HELP_MAX+1];
1060
1061 err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
1062 if (err < 0)
1063 return err;
1064
1065 if (!tb[CTA_HELP_NAME])
1066 return -EINVAL;
1067
1068 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1069
1070 if (tb[CTA_HELP_INFO])
1071 *helpinfo = tb[CTA_HELP_INFO];
1072
1073 return 0;
1074 }
1075
1076 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1077 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1078 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1079 [CTA_STATUS] = { .type = NLA_U32 },
1080 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1081 [CTA_HELP] = { .type = NLA_NESTED },
1082 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1083 [CTA_TIMEOUT] = { .type = NLA_U32 },
1084 [CTA_MARK] = { .type = NLA_U32 },
1085 [CTA_ID] = { .type = NLA_U32 },
1086 [CTA_NAT_DST] = { .type = NLA_NESTED },
1087 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1088 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1089 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1090 [CTA_ZONE] = { .type = NLA_U16 },
1091 [CTA_MARK_MASK] = { .type = NLA_U32 },
1092 [CTA_LABELS] = { .type = NLA_BINARY,
1093 .len = NF_CT_LABELS_MAX_SIZE },
1094 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1095 .len = NF_CT_LABELS_MAX_SIZE },
1096 };
1097
1098 static int ctnetlink_flush_conntrack(struct net *net,
1099 const struct nlattr * const cda[],
1100 u32 portid, int report)
1101 {
1102 struct ctnetlink_filter *filter = NULL;
1103
1104 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1105 filter = ctnetlink_alloc_filter(cda);
1106 if (IS_ERR(filter))
1107 return PTR_ERR(filter);
1108 }
1109
1110 nf_ct_iterate_cleanup(net, ctnetlink_filter_match, filter,
1111 portid, report);
1112 kfree(filter);
1113
1114 return 0;
1115 }
1116
1117 static int
1118 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
1119 const struct nlmsghdr *nlh,
1120 const struct nlattr * const cda[])
1121 {
1122 struct net *net = sock_net(ctnl);
1123 struct nf_conntrack_tuple_hash *h;
1124 struct nf_conntrack_tuple tuple;
1125 struct nf_conn *ct;
1126 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1127 u_int8_t u3 = nfmsg->nfgen_family;
1128 struct nf_conntrack_zone zone;
1129 int err;
1130
1131 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1132 if (err < 0)
1133 return err;
1134
1135 if (cda[CTA_TUPLE_ORIG])
1136 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1137 u3, &zone);
1138 else if (cda[CTA_TUPLE_REPLY])
1139 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1140 u3, &zone);
1141 else {
1142 return ctnetlink_flush_conntrack(net, cda,
1143 NETLINK_CB(skb).portid,
1144 nlmsg_report(nlh));
1145 }
1146
1147 if (err < 0)
1148 return err;
1149
1150 h = nf_conntrack_find_get(net, &zone, &tuple);
1151 if (!h)
1152 return -ENOENT;
1153
1154 ct = nf_ct_tuplehash_to_ctrack(h);
1155
1156 if (cda[CTA_ID]) {
1157 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1158 if (id != (u32)(unsigned long)ct) {
1159 nf_ct_put(ct);
1160 return -ENOENT;
1161 }
1162 }
1163
1164 if (del_timer(&ct->timeout))
1165 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1166
1167 nf_ct_put(ct);
1168
1169 return 0;
1170 }
1171
1172 static int
1173 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
1174 const struct nlmsghdr *nlh,
1175 const struct nlattr * const cda[])
1176 {
1177 struct net *net = sock_net(ctnl);
1178 struct nf_conntrack_tuple_hash *h;
1179 struct nf_conntrack_tuple tuple;
1180 struct nf_conn *ct;
1181 struct sk_buff *skb2 = NULL;
1182 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1183 u_int8_t u3 = nfmsg->nfgen_family;
1184 struct nf_conntrack_zone zone;
1185 int err;
1186
1187 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1188 struct netlink_dump_control c = {
1189 .dump = ctnetlink_dump_table,
1190 .done = ctnetlink_done,
1191 };
1192
1193 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1194 struct ctnetlink_filter *filter;
1195
1196 filter = ctnetlink_alloc_filter(cda);
1197 if (IS_ERR(filter))
1198 return PTR_ERR(filter);
1199
1200 c.data = filter;
1201 }
1202 return netlink_dump_start(ctnl, skb, nlh, &c);
1203 }
1204
1205 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1206 if (err < 0)
1207 return err;
1208
1209 if (cda[CTA_TUPLE_ORIG])
1210 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1211 u3, &zone);
1212 else if (cda[CTA_TUPLE_REPLY])
1213 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1214 u3, &zone);
1215 else
1216 return -EINVAL;
1217
1218 if (err < 0)
1219 return err;
1220
1221 h = nf_conntrack_find_get(net, &zone, &tuple);
1222 if (!h)
1223 return -ENOENT;
1224
1225 ct = nf_ct_tuplehash_to_ctrack(h);
1226
1227 err = -ENOMEM;
1228 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1229 if (skb2 == NULL) {
1230 nf_ct_put(ct);
1231 return -ENOMEM;
1232 }
1233
1234 rcu_read_lock();
1235 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1236 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1237 rcu_read_unlock();
1238 nf_ct_put(ct);
1239 if (err <= 0)
1240 goto free;
1241
1242 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1243 if (err < 0)
1244 goto out;
1245
1246 return 0;
1247
1248 free:
1249 kfree_skb(skb2);
1250 out:
1251 /* this avoids a loop in nfnetlink. */
1252 return err == -EAGAIN ? -ENOBUFS : err;
1253 }
1254
1255 static int ctnetlink_done_list(struct netlink_callback *cb)
1256 {
1257 if (cb->args[1])
1258 nf_ct_put((struct nf_conn *)cb->args[1]);
1259 return 0;
1260 }
1261
1262 static int
1263 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1264 {
1265 struct nf_conn *ct, *last;
1266 struct nf_conntrack_tuple_hash *h;
1267 struct hlist_nulls_node *n;
1268 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1269 u_int8_t l3proto = nfmsg->nfgen_family;
1270 int res;
1271 int cpu;
1272 struct hlist_nulls_head *list;
1273 struct net *net = sock_net(skb->sk);
1274
1275 if (cb->args[2])
1276 return 0;
1277
1278 last = (struct nf_conn *)cb->args[1];
1279
1280 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1281 struct ct_pcpu *pcpu;
1282
1283 if (!cpu_possible(cpu))
1284 continue;
1285
1286 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1287 spin_lock_bh(&pcpu->lock);
1288 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1289 restart:
1290 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1291 ct = nf_ct_tuplehash_to_ctrack(h);
1292 if (l3proto && nf_ct_l3num(ct) != l3proto)
1293 continue;
1294 if (cb->args[1]) {
1295 if (ct != last)
1296 continue;
1297 cb->args[1] = 0;
1298 }
1299 rcu_read_lock();
1300 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1301 cb->nlh->nlmsg_seq,
1302 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1303 ct);
1304 rcu_read_unlock();
1305 if (res < 0) {
1306 if (!atomic_inc_not_zero(&ct->ct_general.use))
1307 continue;
1308 cb->args[0] = cpu;
1309 cb->args[1] = (unsigned long)ct;
1310 spin_unlock_bh(&pcpu->lock);
1311 goto out;
1312 }
1313 }
1314 if (cb->args[1]) {
1315 cb->args[1] = 0;
1316 goto restart;
1317 }
1318 spin_unlock_bh(&pcpu->lock);
1319 }
1320 cb->args[2] = 1;
1321 out:
1322 if (last)
1323 nf_ct_put(last);
1324
1325 return skb->len;
1326 }
1327
1328 static int
1329 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1330 {
1331 return ctnetlink_dump_list(skb, cb, true);
1332 }
1333
1334 static int
1335 ctnetlink_get_ct_dying(struct sock *ctnl, struct sk_buff *skb,
1336 const struct nlmsghdr *nlh,
1337 const struct nlattr * const cda[])
1338 {
1339 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1340 struct netlink_dump_control c = {
1341 .dump = ctnetlink_dump_dying,
1342 .done = ctnetlink_done_list,
1343 };
1344 return netlink_dump_start(ctnl, skb, nlh, &c);
1345 }
1346
1347 return -EOPNOTSUPP;
1348 }
1349
1350 static int
1351 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1352 {
1353 return ctnetlink_dump_list(skb, cb, false);
1354 }
1355
1356 static int
1357 ctnetlink_get_ct_unconfirmed(struct sock *ctnl, struct sk_buff *skb,
1358 const struct nlmsghdr *nlh,
1359 const struct nlattr * const cda[])
1360 {
1361 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1362 struct netlink_dump_control c = {
1363 .dump = ctnetlink_dump_unconfirmed,
1364 .done = ctnetlink_done_list,
1365 };
1366 return netlink_dump_start(ctnl, skb, nlh, &c);
1367 }
1368
1369 return -EOPNOTSUPP;
1370 }
1371
1372 #ifdef CONFIG_NF_NAT_NEEDED
1373 static int
1374 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1375 enum nf_nat_manip_type manip,
1376 const struct nlattr *attr)
1377 {
1378 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1379 int err;
1380
1381 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1382 if (!parse_nat_setup) {
1383 #ifdef CONFIG_MODULES
1384 rcu_read_unlock();
1385 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1386 if (request_module("nf-nat") < 0) {
1387 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1388 rcu_read_lock();
1389 return -EOPNOTSUPP;
1390 }
1391 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1392 rcu_read_lock();
1393 if (nfnetlink_parse_nat_setup_hook)
1394 return -EAGAIN;
1395 #endif
1396 return -EOPNOTSUPP;
1397 }
1398
1399 err = parse_nat_setup(ct, manip, attr);
1400 if (err == -EAGAIN) {
1401 #ifdef CONFIG_MODULES
1402 rcu_read_unlock();
1403 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1404 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1405 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1406 rcu_read_lock();
1407 return -EOPNOTSUPP;
1408 }
1409 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1410 rcu_read_lock();
1411 #else
1412 err = -EOPNOTSUPP;
1413 #endif
1414 }
1415 return err;
1416 }
1417 #endif
1418
1419 static int
1420 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1421 {
1422 unsigned long d;
1423 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1424 d = ct->status ^ status;
1425
1426 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1427 /* unchangeable */
1428 return -EBUSY;
1429
1430 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1431 /* SEEN_REPLY bit can only be set */
1432 return -EBUSY;
1433
1434 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1435 /* ASSURED bit can only be set */
1436 return -EBUSY;
1437
1438 /* Be careful here, modifying NAT bits can screw up things,
1439 * so don't let users modify them directly if they don't pass
1440 * nf_nat_range. */
1441 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1442 return 0;
1443 }
1444
1445 static int
1446 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1447 {
1448 #ifdef CONFIG_NF_NAT_NEEDED
1449 int ret;
1450
1451 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1452 return 0;
1453
1454 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1455 cda[CTA_NAT_DST]);
1456 if (ret < 0)
1457 return ret;
1458
1459 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1460 cda[CTA_NAT_SRC]);
1461 return ret;
1462 #else
1463 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1464 return 0;
1465 return -EOPNOTSUPP;
1466 #endif
1467 }
1468
1469 static inline int
1470 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1471 {
1472 struct nf_conntrack_helper *helper;
1473 struct nf_conn_help *help = nfct_help(ct);
1474 char *helpname = NULL;
1475 struct nlattr *helpinfo = NULL;
1476 int err;
1477
1478 /* don't change helper of sibling connections */
1479 if (ct->master)
1480 return -EBUSY;
1481
1482 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1483 if (err < 0)
1484 return err;
1485
1486 if (!strcmp(helpname, "")) {
1487 if (help && help->helper) {
1488 /* we had a helper before ... */
1489 nf_ct_remove_expectations(ct);
1490 RCU_INIT_POINTER(help->helper, NULL);
1491 }
1492
1493 return 0;
1494 }
1495
1496 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1497 nf_ct_protonum(ct));
1498 if (helper == NULL) {
1499 #ifdef CONFIG_MODULES
1500 spin_unlock_bh(&nf_conntrack_expect_lock);
1501
1502 if (request_module("nfct-helper-%s", helpname) < 0) {
1503 spin_lock_bh(&nf_conntrack_expect_lock);
1504 return -EOPNOTSUPP;
1505 }
1506
1507 spin_lock_bh(&nf_conntrack_expect_lock);
1508 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1509 nf_ct_protonum(ct));
1510 if (helper)
1511 return -EAGAIN;
1512 #endif
1513 return -EOPNOTSUPP;
1514 }
1515
1516 if (help) {
1517 if (help->helper == helper) {
1518 /* update private helper data if allowed. */
1519 if (helper->from_nlattr)
1520 helper->from_nlattr(helpinfo, ct);
1521 return 0;
1522 } else
1523 return -EBUSY;
1524 }
1525
1526 /* we cannot set a helper for an existing conntrack */
1527 return -EOPNOTSUPP;
1528 }
1529
1530 static inline int
1531 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1532 {
1533 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1534
1535 if (!del_timer(&ct->timeout))
1536 return -ETIME;
1537
1538 ct->timeout.expires = jiffies + timeout * HZ;
1539 add_timer(&ct->timeout);
1540
1541 return 0;
1542 }
1543
1544 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1545 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1546 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1547 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1548 };
1549
1550 static inline int
1551 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1552 {
1553 const struct nlattr *attr = cda[CTA_PROTOINFO];
1554 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1555 struct nf_conntrack_l4proto *l4proto;
1556 int err = 0;
1557
1558 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1559 if (err < 0)
1560 return err;
1561
1562 rcu_read_lock();
1563 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1564 if (l4proto->from_nlattr)
1565 err = l4proto->from_nlattr(tb, ct);
1566 rcu_read_unlock();
1567
1568 return err;
1569 }
1570
1571 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1572 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1573 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1574 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1575 };
1576
1577 static inline int
1578 change_seq_adj(struct nf_ct_seqadj *seq, const struct nlattr * const attr)
1579 {
1580 int err;
1581 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1582
1583 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1584 if (err < 0)
1585 return err;
1586
1587 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1588 return -EINVAL;
1589
1590 seq->correction_pos =
1591 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1592
1593 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1594 return -EINVAL;
1595
1596 seq->offset_before =
1597 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1598
1599 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1600 return -EINVAL;
1601
1602 seq->offset_after =
1603 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1604
1605 return 0;
1606 }
1607
1608 static int
1609 ctnetlink_change_seq_adj(struct nf_conn *ct,
1610 const struct nlattr * const cda[])
1611 {
1612 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1613 int ret = 0;
1614
1615 if (!seqadj)
1616 return 0;
1617
1618 if (cda[CTA_SEQ_ADJ_ORIG]) {
1619 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1620 cda[CTA_SEQ_ADJ_ORIG]);
1621 if (ret < 0)
1622 return ret;
1623
1624 ct->status |= IPS_SEQ_ADJUST;
1625 }
1626
1627 if (cda[CTA_SEQ_ADJ_REPLY]) {
1628 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1629 cda[CTA_SEQ_ADJ_REPLY]);
1630 if (ret < 0)
1631 return ret;
1632
1633 ct->status |= IPS_SEQ_ADJUST;
1634 }
1635
1636 return 0;
1637 }
1638
1639 static int
1640 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1641 {
1642 #ifdef CONFIG_NF_CONNTRACK_LABELS
1643 size_t len = nla_len(cda[CTA_LABELS]);
1644 const void *mask = cda[CTA_LABELS_MASK];
1645
1646 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1647 return -EINVAL;
1648
1649 if (mask) {
1650 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1651 nla_len(cda[CTA_LABELS_MASK]) != len)
1652 return -EINVAL;
1653 mask = nla_data(cda[CTA_LABELS_MASK]);
1654 }
1655
1656 len /= sizeof(u32);
1657
1658 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1659 #else
1660 return -EOPNOTSUPP;
1661 #endif
1662 }
1663
1664 static int
1665 ctnetlink_change_conntrack(struct nf_conn *ct,
1666 const struct nlattr * const cda[])
1667 {
1668 int err;
1669
1670 /* only allow NAT changes and master assignation for new conntracks */
1671 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1672 return -EOPNOTSUPP;
1673
1674 if (cda[CTA_HELP]) {
1675 err = ctnetlink_change_helper(ct, cda);
1676 if (err < 0)
1677 return err;
1678 }
1679
1680 if (cda[CTA_TIMEOUT]) {
1681 err = ctnetlink_change_timeout(ct, cda);
1682 if (err < 0)
1683 return err;
1684 }
1685
1686 if (cda[CTA_STATUS]) {
1687 err = ctnetlink_change_status(ct, cda);
1688 if (err < 0)
1689 return err;
1690 }
1691
1692 if (cda[CTA_PROTOINFO]) {
1693 err = ctnetlink_change_protoinfo(ct, cda);
1694 if (err < 0)
1695 return err;
1696 }
1697
1698 #if defined(CONFIG_NF_CONNTRACK_MARK)
1699 if (cda[CTA_MARK])
1700 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1701 #endif
1702
1703 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1704 err = ctnetlink_change_seq_adj(ct, cda);
1705 if (err < 0)
1706 return err;
1707 }
1708
1709 if (cda[CTA_LABELS]) {
1710 err = ctnetlink_attach_labels(ct, cda);
1711 if (err < 0)
1712 return err;
1713 }
1714
1715 return 0;
1716 }
1717
1718 static struct nf_conn *
1719 ctnetlink_create_conntrack(struct net *net,
1720 const struct nf_conntrack_zone *zone,
1721 const struct nlattr * const cda[],
1722 struct nf_conntrack_tuple *otuple,
1723 struct nf_conntrack_tuple *rtuple,
1724 u8 u3)
1725 {
1726 struct nf_conn *ct;
1727 int err = -EINVAL;
1728 struct nf_conntrack_helper *helper;
1729 struct nf_conn_tstamp *tstamp;
1730
1731 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1732 if (IS_ERR(ct))
1733 return ERR_PTR(-ENOMEM);
1734
1735 if (!cda[CTA_TIMEOUT])
1736 goto err1;
1737 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1738
1739 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1740
1741 rcu_read_lock();
1742 if (cda[CTA_HELP]) {
1743 char *helpname = NULL;
1744 struct nlattr *helpinfo = NULL;
1745
1746 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1747 if (err < 0)
1748 goto err2;
1749
1750 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1751 nf_ct_protonum(ct));
1752 if (helper == NULL) {
1753 rcu_read_unlock();
1754 #ifdef CONFIG_MODULES
1755 if (request_module("nfct-helper-%s", helpname) < 0) {
1756 err = -EOPNOTSUPP;
1757 goto err1;
1758 }
1759
1760 rcu_read_lock();
1761 helper = __nf_conntrack_helper_find(helpname,
1762 nf_ct_l3num(ct),
1763 nf_ct_protonum(ct));
1764 if (helper) {
1765 err = -EAGAIN;
1766 goto err2;
1767 }
1768 rcu_read_unlock();
1769 #endif
1770 err = -EOPNOTSUPP;
1771 goto err1;
1772 } else {
1773 struct nf_conn_help *help;
1774
1775 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1776 if (help == NULL) {
1777 err = -ENOMEM;
1778 goto err2;
1779 }
1780 /* set private helper data if allowed. */
1781 if (helper->from_nlattr)
1782 helper->from_nlattr(helpinfo, ct);
1783
1784 /* not in hash table yet so not strictly necessary */
1785 RCU_INIT_POINTER(help->helper, helper);
1786 }
1787 } else {
1788 /* try an implicit helper assignation */
1789 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1790 if (err < 0)
1791 goto err2;
1792 }
1793
1794 err = ctnetlink_setup_nat(ct, cda);
1795 if (err < 0)
1796 goto err2;
1797
1798 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1799 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1800 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1801 nf_ct_labels_ext_add(ct);
1802
1803 /* we must add conntrack extensions before confirmation. */
1804 ct->status |= IPS_CONFIRMED;
1805
1806 if (cda[CTA_STATUS]) {
1807 err = ctnetlink_change_status(ct, cda);
1808 if (err < 0)
1809 goto err2;
1810 }
1811
1812 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1813 err = ctnetlink_change_seq_adj(ct, cda);
1814 if (err < 0)
1815 goto err2;
1816 }
1817
1818 memset(&ct->proto, 0, sizeof(ct->proto));
1819 if (cda[CTA_PROTOINFO]) {
1820 err = ctnetlink_change_protoinfo(ct, cda);
1821 if (err < 0)
1822 goto err2;
1823 }
1824
1825 #if defined(CONFIG_NF_CONNTRACK_MARK)
1826 if (cda[CTA_MARK])
1827 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1828 #endif
1829
1830 /* setup master conntrack: this is a confirmed expectation */
1831 if (cda[CTA_TUPLE_MASTER]) {
1832 struct nf_conntrack_tuple master;
1833 struct nf_conntrack_tuple_hash *master_h;
1834 struct nf_conn *master_ct;
1835
1836 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
1837 u3, NULL);
1838 if (err < 0)
1839 goto err2;
1840
1841 master_h = nf_conntrack_find_get(net, zone, &master);
1842 if (master_h == NULL) {
1843 err = -ENOENT;
1844 goto err2;
1845 }
1846 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1847 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1848 ct->master = master_ct;
1849 }
1850 tstamp = nf_conn_tstamp_find(ct);
1851 if (tstamp)
1852 tstamp->start = ktime_get_real_ns();
1853
1854 err = nf_conntrack_hash_check_insert(ct);
1855 if (err < 0)
1856 goto err2;
1857
1858 rcu_read_unlock();
1859
1860 return ct;
1861
1862 err2:
1863 rcu_read_unlock();
1864 err1:
1865 nf_conntrack_free(ct);
1866 return ERR_PTR(err);
1867 }
1868
1869 static int
1870 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1871 const struct nlmsghdr *nlh,
1872 const struct nlattr * const cda[])
1873 {
1874 struct net *net = sock_net(ctnl);
1875 struct nf_conntrack_tuple otuple, rtuple;
1876 struct nf_conntrack_tuple_hash *h = NULL;
1877 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1878 struct nf_conn *ct;
1879 u_int8_t u3 = nfmsg->nfgen_family;
1880 struct nf_conntrack_zone zone;
1881 int err;
1882
1883 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1884 if (err < 0)
1885 return err;
1886
1887 if (cda[CTA_TUPLE_ORIG]) {
1888 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
1889 u3, &zone);
1890 if (err < 0)
1891 return err;
1892 }
1893
1894 if (cda[CTA_TUPLE_REPLY]) {
1895 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
1896 u3, &zone);
1897 if (err < 0)
1898 return err;
1899 }
1900
1901 if (cda[CTA_TUPLE_ORIG])
1902 h = nf_conntrack_find_get(net, &zone, &otuple);
1903 else if (cda[CTA_TUPLE_REPLY])
1904 h = nf_conntrack_find_get(net, &zone, &rtuple);
1905
1906 if (h == NULL) {
1907 err = -ENOENT;
1908 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1909 enum ip_conntrack_events events;
1910
1911 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1912 return -EINVAL;
1913
1914 ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
1915 &rtuple, u3);
1916 if (IS_ERR(ct))
1917 return PTR_ERR(ct);
1918
1919 err = 0;
1920 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1921 events = IPCT_RELATED;
1922 else
1923 events = IPCT_NEW;
1924
1925 if (cda[CTA_LABELS] &&
1926 ctnetlink_attach_labels(ct, cda) == 0)
1927 events |= (1 << IPCT_LABEL);
1928
1929 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1930 (1 << IPCT_ASSURED) |
1931 (1 << IPCT_HELPER) |
1932 (1 << IPCT_PROTOINFO) |
1933 (1 << IPCT_SEQADJ) |
1934 (1 << IPCT_MARK) | events,
1935 ct, NETLINK_CB(skb).portid,
1936 nlmsg_report(nlh));
1937 nf_ct_put(ct);
1938 }
1939
1940 return err;
1941 }
1942 /* implicit 'else' */
1943
1944 err = -EEXIST;
1945 ct = nf_ct_tuplehash_to_ctrack(h);
1946 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1947 spin_lock_bh(&nf_conntrack_expect_lock);
1948 err = ctnetlink_change_conntrack(ct, cda);
1949 spin_unlock_bh(&nf_conntrack_expect_lock);
1950 if (err == 0) {
1951 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1952 (1 << IPCT_ASSURED) |
1953 (1 << IPCT_HELPER) |
1954 (1 << IPCT_LABEL) |
1955 (1 << IPCT_PROTOINFO) |
1956 (1 << IPCT_SEQADJ) |
1957 (1 << IPCT_MARK),
1958 ct, NETLINK_CB(skb).portid,
1959 nlmsg_report(nlh));
1960 }
1961 }
1962
1963 nf_ct_put(ct);
1964 return err;
1965 }
1966
1967 static int
1968 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1969 __u16 cpu, const struct ip_conntrack_stat *st)
1970 {
1971 struct nlmsghdr *nlh;
1972 struct nfgenmsg *nfmsg;
1973 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1974
1975 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1976 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1977 if (nlh == NULL)
1978 goto nlmsg_failure;
1979
1980 nfmsg = nlmsg_data(nlh);
1981 nfmsg->nfgen_family = AF_UNSPEC;
1982 nfmsg->version = NFNETLINK_V0;
1983 nfmsg->res_id = htons(cpu);
1984
1985 if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1986 nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1987 nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
1988 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1989 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1990 nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
1991 nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
1992 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1993 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1994 htonl(st->insert_failed)) ||
1995 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1996 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1997 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1998 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1999 htonl(st->search_restart)))
2000 goto nla_put_failure;
2001
2002 nlmsg_end(skb, nlh);
2003 return skb->len;
2004
2005 nla_put_failure:
2006 nlmsg_failure:
2007 nlmsg_cancel(skb, nlh);
2008 return -1;
2009 }
2010
2011 static int
2012 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2013 {
2014 int cpu;
2015 struct net *net = sock_net(skb->sk);
2016
2017 if (cb->args[0] == nr_cpu_ids)
2018 return 0;
2019
2020 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2021 const struct ip_conntrack_stat *st;
2022
2023 if (!cpu_possible(cpu))
2024 continue;
2025
2026 st = per_cpu_ptr(net->ct.stat, cpu);
2027 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2028 NETLINK_CB(cb->skb).portid,
2029 cb->nlh->nlmsg_seq,
2030 cpu, st) < 0)
2031 break;
2032 }
2033 cb->args[0] = cpu;
2034
2035 return skb->len;
2036 }
2037
2038 static int
2039 ctnetlink_stat_ct_cpu(struct sock *ctnl, struct sk_buff *skb,
2040 const struct nlmsghdr *nlh,
2041 const struct nlattr * const cda[])
2042 {
2043 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2044 struct netlink_dump_control c = {
2045 .dump = ctnetlink_ct_stat_cpu_dump,
2046 };
2047 return netlink_dump_start(ctnl, skb, nlh, &c);
2048 }
2049
2050 return 0;
2051 }
2052
2053 static int
2054 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2055 struct net *net)
2056 {
2057 struct nlmsghdr *nlh;
2058 struct nfgenmsg *nfmsg;
2059 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2060 unsigned int nr_conntracks = atomic_read(&net->ct.count);
2061
2062 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
2063 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2064 if (nlh == NULL)
2065 goto nlmsg_failure;
2066
2067 nfmsg = nlmsg_data(nlh);
2068 nfmsg->nfgen_family = AF_UNSPEC;
2069 nfmsg->version = NFNETLINK_V0;
2070 nfmsg->res_id = 0;
2071
2072 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2073 goto nla_put_failure;
2074
2075 nlmsg_end(skb, nlh);
2076 return skb->len;
2077
2078 nla_put_failure:
2079 nlmsg_failure:
2080 nlmsg_cancel(skb, nlh);
2081 return -1;
2082 }
2083
2084 static int
2085 ctnetlink_stat_ct(struct sock *ctnl, struct sk_buff *skb,
2086 const struct nlmsghdr *nlh,
2087 const struct nlattr * const cda[])
2088 {
2089 struct sk_buff *skb2;
2090 int err;
2091
2092 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2093 if (skb2 == NULL)
2094 return -ENOMEM;
2095
2096 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2097 nlh->nlmsg_seq,
2098 NFNL_MSG_TYPE(nlh->nlmsg_type),
2099 sock_net(skb->sk));
2100 if (err <= 0)
2101 goto free;
2102
2103 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2104 if (err < 0)
2105 goto out;
2106
2107 return 0;
2108
2109 free:
2110 kfree_skb(skb2);
2111 out:
2112 /* this avoids a loop in nfnetlink. */
2113 return err == -EAGAIN ? -ENOBUFS : err;
2114 }
2115
2116 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2117 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2118 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2119 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2120 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2121 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2122 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2123 .len = NF_CT_HELPER_NAME_LEN - 1 },
2124 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2125 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2126 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2127 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2128 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2129 };
2130
2131 static struct nf_conntrack_expect *
2132 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2133 struct nf_conntrack_helper *helper,
2134 struct nf_conntrack_tuple *tuple,
2135 struct nf_conntrack_tuple *mask);
2136
2137 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
2138 static size_t
2139 ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
2140 {
2141 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2142 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2143 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2144 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2145 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2146 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2147 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2148 + nla_total_size(0) /* CTA_PROTOINFO */
2149 + nla_total_size(0) /* CTA_HELP */
2150 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2151 + ctnetlink_secctx_size(ct)
2152 #ifdef CONFIG_NF_NAT_NEEDED
2153 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2154 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2155 #endif
2156 #ifdef CONFIG_NF_CONNTRACK_MARK
2157 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2158 #endif
2159 #ifdef CONFIG_NF_CONNTRACK_ZONES
2160 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2161 #endif
2162 + ctnetlink_proto_size(ct)
2163 ;
2164 }
2165
2166 static int
2167 ctnetlink_nfqueue_build(struct sk_buff *skb, struct nf_conn *ct)
2168 {
2169 const struct nf_conntrack_zone *zone;
2170 struct nlattr *nest_parms;
2171
2172 rcu_read_lock();
2173 zone = nf_ct_zone(ct);
2174
2175 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2176 if (!nest_parms)
2177 goto nla_put_failure;
2178 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2179 goto nla_put_failure;
2180 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2181 NF_CT_ZONE_DIR_ORIG) < 0)
2182 goto nla_put_failure;
2183 nla_nest_end(skb, nest_parms);
2184
2185 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2186 if (!nest_parms)
2187 goto nla_put_failure;
2188 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2189 goto nla_put_failure;
2190 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2191 NF_CT_ZONE_DIR_REPL) < 0)
2192 goto nla_put_failure;
2193 nla_nest_end(skb, nest_parms);
2194
2195 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2196 NF_CT_DEFAULT_ZONE_DIR) < 0)
2197 goto nla_put_failure;
2198
2199 if (ctnetlink_dump_id(skb, ct) < 0)
2200 goto nla_put_failure;
2201
2202 if (ctnetlink_dump_status(skb, ct) < 0)
2203 goto nla_put_failure;
2204
2205 if (ctnetlink_dump_timeout(skb, ct) < 0)
2206 goto nla_put_failure;
2207
2208 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2209 goto nla_put_failure;
2210
2211 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2212 goto nla_put_failure;
2213
2214 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2215 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2216 goto nla_put_failure;
2217 #endif
2218 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2219 goto nla_put_failure;
2220
2221 if ((ct->status & IPS_SEQ_ADJUST) &&
2222 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2223 goto nla_put_failure;
2224
2225 #ifdef CONFIG_NF_CONNTRACK_MARK
2226 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2227 goto nla_put_failure;
2228 #endif
2229 if (ctnetlink_dump_labels(skb, ct) < 0)
2230 goto nla_put_failure;
2231 rcu_read_unlock();
2232 return 0;
2233
2234 nla_put_failure:
2235 rcu_read_unlock();
2236 return -ENOSPC;
2237 }
2238
2239 static int
2240 ctnetlink_nfqueue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2241 {
2242 int err;
2243
2244 if (cda[CTA_TIMEOUT]) {
2245 err = ctnetlink_change_timeout(ct, cda);
2246 if (err < 0)
2247 return err;
2248 }
2249 if (cda[CTA_STATUS]) {
2250 err = ctnetlink_change_status(ct, cda);
2251 if (err < 0)
2252 return err;
2253 }
2254 if (cda[CTA_HELP]) {
2255 err = ctnetlink_change_helper(ct, cda);
2256 if (err < 0)
2257 return err;
2258 }
2259 if (cda[CTA_LABELS]) {
2260 err = ctnetlink_attach_labels(ct, cda);
2261 if (err < 0)
2262 return err;
2263 }
2264 #if defined(CONFIG_NF_CONNTRACK_MARK)
2265 if (cda[CTA_MARK]) {
2266 u32 mask = 0, mark, newmark;
2267 if (cda[CTA_MARK_MASK])
2268 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2269
2270 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2271 newmark = (ct->mark & mask) ^ mark;
2272 if (newmark != ct->mark)
2273 ct->mark = newmark;
2274 }
2275 #endif
2276 return 0;
2277 }
2278
2279 static int
2280 ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
2281 {
2282 struct nlattr *cda[CTA_MAX+1];
2283 int ret;
2284
2285 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2286 if (ret < 0)
2287 return ret;
2288
2289 spin_lock_bh(&nf_conntrack_expect_lock);
2290 ret = ctnetlink_nfqueue_parse_ct((const struct nlattr **)cda, ct);
2291 spin_unlock_bh(&nf_conntrack_expect_lock);
2292
2293 return ret;
2294 }
2295
2296 static int ctnetlink_nfqueue_exp_parse(const struct nlattr * const *cda,
2297 const struct nf_conn *ct,
2298 struct nf_conntrack_tuple *tuple,
2299 struct nf_conntrack_tuple *mask)
2300 {
2301 int err;
2302
2303 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2304 nf_ct_l3num(ct), NULL);
2305 if (err < 0)
2306 return err;
2307
2308 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2309 nf_ct_l3num(ct), NULL);
2310 }
2311
2312 static int
2313 ctnetlink_nfqueue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2314 u32 portid, u32 report)
2315 {
2316 struct nlattr *cda[CTA_EXPECT_MAX+1];
2317 struct nf_conntrack_tuple tuple, mask;
2318 struct nf_conntrack_helper *helper = NULL;
2319 struct nf_conntrack_expect *exp;
2320 int err;
2321
2322 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2323 if (err < 0)
2324 return err;
2325
2326 err = ctnetlink_nfqueue_exp_parse((const struct nlattr * const *)cda,
2327 ct, &tuple, &mask);
2328 if (err < 0)
2329 return err;
2330
2331 if (cda[CTA_EXPECT_HELP_NAME]) {
2332 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2333
2334 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2335 nf_ct_protonum(ct));
2336 if (helper == NULL)
2337 return -EOPNOTSUPP;
2338 }
2339
2340 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2341 helper, &tuple, &mask);
2342 if (IS_ERR(exp))
2343 return PTR_ERR(exp);
2344
2345 err = nf_ct_expect_related_report(exp, portid, report);
2346 if (err < 0) {
2347 nf_ct_expect_put(exp);
2348 return err;
2349 }
2350
2351 return 0;
2352 }
2353
2354 static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
2355 .build_size = ctnetlink_nfqueue_build_size,
2356 .build = ctnetlink_nfqueue_build,
2357 .parse = ctnetlink_nfqueue_parse,
2358 .attach_expect = ctnetlink_nfqueue_attach_expect,
2359 .seq_adjust = nf_ct_tcp_seqadj_set,
2360 };
2361 #endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
2362
2363 /***********************************************************************
2364 * EXPECT
2365 ***********************************************************************/
2366
2367 static inline int
2368 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2369 const struct nf_conntrack_tuple *tuple,
2370 enum ctattr_expect type)
2371 {
2372 struct nlattr *nest_parms;
2373
2374 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2375 if (!nest_parms)
2376 goto nla_put_failure;
2377 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2378 goto nla_put_failure;
2379 nla_nest_end(skb, nest_parms);
2380
2381 return 0;
2382
2383 nla_put_failure:
2384 return -1;
2385 }
2386
2387 static inline int
2388 ctnetlink_exp_dump_mask(struct sk_buff *skb,
2389 const struct nf_conntrack_tuple *tuple,
2390 const struct nf_conntrack_tuple_mask *mask)
2391 {
2392 int ret;
2393 struct nf_conntrack_l3proto *l3proto;
2394 struct nf_conntrack_l4proto *l4proto;
2395 struct nf_conntrack_tuple m;
2396 struct nlattr *nest_parms;
2397
2398 memset(&m, 0xFF, sizeof(m));
2399 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2400 m.src.u.all = mask->src.u.all;
2401 m.dst.protonum = tuple->dst.protonum;
2402
2403 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2404 if (!nest_parms)
2405 goto nla_put_failure;
2406
2407 rcu_read_lock();
2408 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2409 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2410 if (ret >= 0) {
2411 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2412 tuple->dst.protonum);
2413 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2414 }
2415 rcu_read_unlock();
2416
2417 if (unlikely(ret < 0))
2418 goto nla_put_failure;
2419
2420 nla_nest_end(skb, nest_parms);
2421
2422 return 0;
2423
2424 nla_put_failure:
2425 return -1;
2426 }
2427
2428 static const union nf_inet_addr any_addr;
2429
2430 static int
2431 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2432 const struct nf_conntrack_expect *exp)
2433 {
2434 struct nf_conn *master = exp->master;
2435 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2436 struct nf_conn_help *help;
2437 #ifdef CONFIG_NF_NAT_NEEDED
2438 struct nlattr *nest_parms;
2439 struct nf_conntrack_tuple nat_tuple = {};
2440 #endif
2441 struct nf_ct_helper_expectfn *expfn;
2442
2443 if (timeout < 0)
2444 timeout = 0;
2445
2446 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2447 goto nla_put_failure;
2448 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2449 goto nla_put_failure;
2450 if (ctnetlink_exp_dump_tuple(skb,
2451 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2452 CTA_EXPECT_MASTER) < 0)
2453 goto nla_put_failure;
2454
2455 #ifdef CONFIG_NF_NAT_NEEDED
2456 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2457 exp->saved_proto.all) {
2458 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2459 if (!nest_parms)
2460 goto nla_put_failure;
2461
2462 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2463 goto nla_put_failure;
2464
2465 nat_tuple.src.l3num = nf_ct_l3num(master);
2466 nat_tuple.src.u3 = exp->saved_addr;
2467 nat_tuple.dst.protonum = nf_ct_protonum(master);
2468 nat_tuple.src.u = exp->saved_proto;
2469
2470 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2471 CTA_EXPECT_NAT_TUPLE) < 0)
2472 goto nla_put_failure;
2473 nla_nest_end(skb, nest_parms);
2474 }
2475 #endif
2476 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2477 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2478 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2479 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2480 goto nla_put_failure;
2481 help = nfct_help(master);
2482 if (help) {
2483 struct nf_conntrack_helper *helper;
2484
2485 helper = rcu_dereference(help->helper);
2486 if (helper &&
2487 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2488 goto nla_put_failure;
2489 }
2490 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2491 if (expfn != NULL &&
2492 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2493 goto nla_put_failure;
2494
2495 return 0;
2496
2497 nla_put_failure:
2498 return -1;
2499 }
2500
2501 static int
2502 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2503 int event, const struct nf_conntrack_expect *exp)
2504 {
2505 struct nlmsghdr *nlh;
2506 struct nfgenmsg *nfmsg;
2507 unsigned int flags = portid ? NLM_F_MULTI : 0;
2508
2509 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2510 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2511 if (nlh == NULL)
2512 goto nlmsg_failure;
2513
2514 nfmsg = nlmsg_data(nlh);
2515 nfmsg->nfgen_family = exp->tuple.src.l3num;
2516 nfmsg->version = NFNETLINK_V0;
2517 nfmsg->res_id = 0;
2518
2519 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2520 goto nla_put_failure;
2521
2522 nlmsg_end(skb, nlh);
2523 return skb->len;
2524
2525 nlmsg_failure:
2526 nla_put_failure:
2527 nlmsg_cancel(skb, nlh);
2528 return -1;
2529 }
2530
2531 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2532 static int
2533 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2534 {
2535 struct nf_conntrack_expect *exp = item->exp;
2536 struct net *net = nf_ct_exp_net(exp);
2537 struct nlmsghdr *nlh;
2538 struct nfgenmsg *nfmsg;
2539 struct sk_buff *skb;
2540 unsigned int type, group;
2541 int flags = 0;
2542
2543 if (events & (1 << IPEXP_DESTROY)) {
2544 type = IPCTNL_MSG_EXP_DELETE;
2545 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2546 } else if (events & (1 << IPEXP_NEW)) {
2547 type = IPCTNL_MSG_EXP_NEW;
2548 flags = NLM_F_CREATE|NLM_F_EXCL;
2549 group = NFNLGRP_CONNTRACK_EXP_NEW;
2550 } else
2551 return 0;
2552
2553 if (!item->report && !nfnetlink_has_listeners(net, group))
2554 return 0;
2555
2556 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2557 if (skb == NULL)
2558 goto errout;
2559
2560 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2561 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2562 if (nlh == NULL)
2563 goto nlmsg_failure;
2564
2565 nfmsg = nlmsg_data(nlh);
2566 nfmsg->nfgen_family = exp->tuple.src.l3num;
2567 nfmsg->version = NFNETLINK_V0;
2568 nfmsg->res_id = 0;
2569
2570 rcu_read_lock();
2571 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2572 goto nla_put_failure;
2573 rcu_read_unlock();
2574
2575 nlmsg_end(skb, nlh);
2576 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2577 return 0;
2578
2579 nla_put_failure:
2580 rcu_read_unlock();
2581 nlmsg_cancel(skb, nlh);
2582 nlmsg_failure:
2583 kfree_skb(skb);
2584 errout:
2585 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2586 return 0;
2587 }
2588 #endif
2589 static int ctnetlink_exp_done(struct netlink_callback *cb)
2590 {
2591 if (cb->args[1])
2592 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2593 return 0;
2594 }
2595
2596 static int
2597 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2598 {
2599 struct net *net = sock_net(skb->sk);
2600 struct nf_conntrack_expect *exp, *last;
2601 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2602 u_int8_t l3proto = nfmsg->nfgen_family;
2603
2604 rcu_read_lock();
2605 last = (struct nf_conntrack_expect *)cb->args[1];
2606 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2607 restart:
2608 hlist_for_each_entry(exp, &net->ct.expect_hash[cb->args[0]],
2609 hnode) {
2610 if (l3proto && exp->tuple.src.l3num != l3proto)
2611 continue;
2612 if (cb->args[1]) {
2613 if (exp != last)
2614 continue;
2615 cb->args[1] = 0;
2616 }
2617 if (ctnetlink_exp_fill_info(skb,
2618 NETLINK_CB(cb->skb).portid,
2619 cb->nlh->nlmsg_seq,
2620 IPCTNL_MSG_EXP_NEW,
2621 exp) < 0) {
2622 if (!atomic_inc_not_zero(&exp->use))
2623 continue;
2624 cb->args[1] = (unsigned long)exp;
2625 goto out;
2626 }
2627 }
2628 if (cb->args[1]) {
2629 cb->args[1] = 0;
2630 goto restart;
2631 }
2632 }
2633 out:
2634 rcu_read_unlock();
2635 if (last)
2636 nf_ct_expect_put(last);
2637
2638 return skb->len;
2639 }
2640
2641 static int
2642 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2643 {
2644 struct nf_conntrack_expect *exp, *last;
2645 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2646 struct nf_conn *ct = cb->data;
2647 struct nf_conn_help *help = nfct_help(ct);
2648 u_int8_t l3proto = nfmsg->nfgen_family;
2649
2650 if (cb->args[0])
2651 return 0;
2652
2653 rcu_read_lock();
2654 last = (struct nf_conntrack_expect *)cb->args[1];
2655 restart:
2656 hlist_for_each_entry(exp, &help->expectations, lnode) {
2657 if (l3proto && exp->tuple.src.l3num != l3proto)
2658 continue;
2659 if (cb->args[1]) {
2660 if (exp != last)
2661 continue;
2662 cb->args[1] = 0;
2663 }
2664 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2665 cb->nlh->nlmsg_seq,
2666 IPCTNL_MSG_EXP_NEW,
2667 exp) < 0) {
2668 if (!atomic_inc_not_zero(&exp->use))
2669 continue;
2670 cb->args[1] = (unsigned long)exp;
2671 goto out;
2672 }
2673 }
2674 if (cb->args[1]) {
2675 cb->args[1] = 0;
2676 goto restart;
2677 }
2678 cb->args[0] = 1;
2679 out:
2680 rcu_read_unlock();
2681 if (last)
2682 nf_ct_expect_put(last);
2683
2684 return skb->len;
2685 }
2686
2687 static int ctnetlink_dump_exp_ct(struct sock *ctnl, struct sk_buff *skb,
2688 const struct nlmsghdr *nlh,
2689 const struct nlattr * const cda[])
2690 {
2691 int err;
2692 struct net *net = sock_net(ctnl);
2693 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2694 u_int8_t u3 = nfmsg->nfgen_family;
2695 struct nf_conntrack_tuple tuple;
2696 struct nf_conntrack_tuple_hash *h;
2697 struct nf_conn *ct;
2698 struct nf_conntrack_zone zone;
2699 struct netlink_dump_control c = {
2700 .dump = ctnetlink_exp_ct_dump_table,
2701 .done = ctnetlink_exp_done,
2702 };
2703
2704 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2705 u3, NULL);
2706 if (err < 0)
2707 return err;
2708
2709 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2710 if (err < 0)
2711 return err;
2712
2713 h = nf_conntrack_find_get(net, &zone, &tuple);
2714 if (!h)
2715 return -ENOENT;
2716
2717 ct = nf_ct_tuplehash_to_ctrack(h);
2718 c.data = ct;
2719
2720 err = netlink_dump_start(ctnl, skb, nlh, &c);
2721 nf_ct_put(ct);
2722
2723 return err;
2724 }
2725
2726 static int
2727 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
2728 const struct nlmsghdr *nlh,
2729 const struct nlattr * const cda[])
2730 {
2731 struct net *net = sock_net(ctnl);
2732 struct nf_conntrack_tuple tuple;
2733 struct nf_conntrack_expect *exp;
2734 struct sk_buff *skb2;
2735 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2736 u_int8_t u3 = nfmsg->nfgen_family;
2737 struct nf_conntrack_zone zone;
2738 int err;
2739
2740 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2741 if (cda[CTA_EXPECT_MASTER])
2742 return ctnetlink_dump_exp_ct(ctnl, skb, nlh, cda);
2743 else {
2744 struct netlink_dump_control c = {
2745 .dump = ctnetlink_exp_dump_table,
2746 .done = ctnetlink_exp_done,
2747 };
2748 return netlink_dump_start(ctnl, skb, nlh, &c);
2749 }
2750 }
2751
2752 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2753 if (err < 0)
2754 return err;
2755
2756 if (cda[CTA_EXPECT_TUPLE])
2757 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2758 u3, NULL);
2759 else if (cda[CTA_EXPECT_MASTER])
2760 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2761 u3, NULL);
2762 else
2763 return -EINVAL;
2764
2765 if (err < 0)
2766 return err;
2767
2768 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2769 if (!exp)
2770 return -ENOENT;
2771
2772 if (cda[CTA_EXPECT_ID]) {
2773 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2774 if (ntohl(id) != (u32)(unsigned long)exp) {
2775 nf_ct_expect_put(exp);
2776 return -ENOENT;
2777 }
2778 }
2779
2780 err = -ENOMEM;
2781 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2782 if (skb2 == NULL) {
2783 nf_ct_expect_put(exp);
2784 goto out;
2785 }
2786
2787 rcu_read_lock();
2788 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2789 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2790 rcu_read_unlock();
2791 nf_ct_expect_put(exp);
2792 if (err <= 0)
2793 goto free;
2794
2795 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2796 if (err < 0)
2797 goto out;
2798
2799 return 0;
2800
2801 free:
2802 kfree_skb(skb2);
2803 out:
2804 /* this avoids a loop in nfnetlink. */
2805 return err == -EAGAIN ? -ENOBUFS : err;
2806 }
2807
2808 static int
2809 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
2810 const struct nlmsghdr *nlh,
2811 const struct nlattr * const cda[])
2812 {
2813 struct net *net = sock_net(ctnl);
2814 struct nf_conntrack_expect *exp;
2815 struct nf_conntrack_tuple tuple;
2816 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2817 struct hlist_node *next;
2818 u_int8_t u3 = nfmsg->nfgen_family;
2819 struct nf_conntrack_zone zone;
2820 unsigned int i;
2821 int err;
2822
2823 if (cda[CTA_EXPECT_TUPLE]) {
2824 /* delete a single expect by tuple */
2825 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2826 if (err < 0)
2827 return err;
2828
2829 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2830 u3, NULL);
2831 if (err < 0)
2832 return err;
2833
2834 /* bump usage count to 2 */
2835 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2836 if (!exp)
2837 return -ENOENT;
2838
2839 if (cda[CTA_EXPECT_ID]) {
2840 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2841 if (ntohl(id) != (u32)(unsigned long)exp) {
2842 nf_ct_expect_put(exp);
2843 return -ENOENT;
2844 }
2845 }
2846
2847 /* after list removal, usage count == 1 */
2848 spin_lock_bh(&nf_conntrack_expect_lock);
2849 if (del_timer(&exp->timeout)) {
2850 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2851 nlmsg_report(nlh));
2852 nf_ct_expect_put(exp);
2853 }
2854 spin_unlock_bh(&nf_conntrack_expect_lock);
2855 /* have to put what we 'get' above.
2856 * after this line usage count == 0 */
2857 nf_ct_expect_put(exp);
2858 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2859 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2860 struct nf_conn_help *m_help;
2861
2862 /* delete all expectations for this helper */
2863 spin_lock_bh(&nf_conntrack_expect_lock);
2864 for (i = 0; i < nf_ct_expect_hsize; i++) {
2865 hlist_for_each_entry_safe(exp, next,
2866 &net->ct.expect_hash[i],
2867 hnode) {
2868 m_help = nfct_help(exp->master);
2869 if (!strcmp(m_help->helper->name, name) &&
2870 del_timer(&exp->timeout)) {
2871 nf_ct_unlink_expect_report(exp,
2872 NETLINK_CB(skb).portid,
2873 nlmsg_report(nlh));
2874 nf_ct_expect_put(exp);
2875 }
2876 }
2877 }
2878 spin_unlock_bh(&nf_conntrack_expect_lock);
2879 } else {
2880 /* This basically means we have to flush everything*/
2881 spin_lock_bh(&nf_conntrack_expect_lock);
2882 for (i = 0; i < nf_ct_expect_hsize; i++) {
2883 hlist_for_each_entry_safe(exp, next,
2884 &net->ct.expect_hash[i],
2885 hnode) {
2886 if (del_timer(&exp->timeout)) {
2887 nf_ct_unlink_expect_report(exp,
2888 NETLINK_CB(skb).portid,
2889 nlmsg_report(nlh));
2890 nf_ct_expect_put(exp);
2891 }
2892 }
2893 }
2894 spin_unlock_bh(&nf_conntrack_expect_lock);
2895 }
2896
2897 return 0;
2898 }
2899 static int
2900 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2901 const struct nlattr * const cda[])
2902 {
2903 if (cda[CTA_EXPECT_TIMEOUT]) {
2904 if (!del_timer(&x->timeout))
2905 return -ETIME;
2906
2907 x->timeout.expires = jiffies +
2908 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2909 add_timer(&x->timeout);
2910 }
2911 return 0;
2912 }
2913
2914 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2915 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2916 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2917 };
2918
2919 static int
2920 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2921 struct nf_conntrack_expect *exp,
2922 u_int8_t u3)
2923 {
2924 #ifdef CONFIG_NF_NAT_NEEDED
2925 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2926 struct nf_conntrack_tuple nat_tuple = {};
2927 int err;
2928
2929 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2930 if (err < 0)
2931 return err;
2932
2933 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2934 return -EINVAL;
2935
2936 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2937 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
2938 u3, NULL);
2939 if (err < 0)
2940 return err;
2941
2942 exp->saved_addr = nat_tuple.src.u3;
2943 exp->saved_proto = nat_tuple.src.u;
2944 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2945
2946 return 0;
2947 #else
2948 return -EOPNOTSUPP;
2949 #endif
2950 }
2951
2952 static struct nf_conntrack_expect *
2953 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
2954 struct nf_conntrack_helper *helper,
2955 struct nf_conntrack_tuple *tuple,
2956 struct nf_conntrack_tuple *mask)
2957 {
2958 u_int32_t class = 0;
2959 struct nf_conntrack_expect *exp;
2960 struct nf_conn_help *help;
2961 int err;
2962
2963 if (cda[CTA_EXPECT_CLASS] && helper) {
2964 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
2965 if (class > helper->expect_class_max)
2966 return ERR_PTR(-EINVAL);
2967 }
2968 exp = nf_ct_expect_alloc(ct);
2969 if (!exp)
2970 return ERR_PTR(-ENOMEM);
2971
2972 help = nfct_help(ct);
2973 if (!help) {
2974 if (!cda[CTA_EXPECT_TIMEOUT]) {
2975 err = -EINVAL;
2976 goto err_out;
2977 }
2978 exp->timeout.expires =
2979 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2980
2981 exp->flags = NF_CT_EXPECT_USERSPACE;
2982 if (cda[CTA_EXPECT_FLAGS]) {
2983 exp->flags |=
2984 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2985 }
2986 } else {
2987 if (cda[CTA_EXPECT_FLAGS]) {
2988 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2989 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2990 } else
2991 exp->flags = 0;
2992 }
2993 if (cda[CTA_EXPECT_FN]) {
2994 const char *name = nla_data(cda[CTA_EXPECT_FN]);
2995 struct nf_ct_helper_expectfn *expfn;
2996
2997 expfn = nf_ct_helper_expectfn_find_by_name(name);
2998 if (expfn == NULL) {
2999 err = -EINVAL;
3000 goto err_out;
3001 }
3002 exp->expectfn = expfn->expectfn;
3003 } else
3004 exp->expectfn = NULL;
3005
3006 exp->class = class;
3007 exp->master = ct;
3008 exp->helper = helper;
3009 exp->tuple = *tuple;
3010 exp->mask.src.u3 = mask->src.u3;
3011 exp->mask.src.u.all = mask->src.u.all;
3012
3013 if (cda[CTA_EXPECT_NAT]) {
3014 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3015 exp, nf_ct_l3num(ct));
3016 if (err < 0)
3017 goto err_out;
3018 }
3019 return exp;
3020 err_out:
3021 nf_ct_expect_put(exp);
3022 return ERR_PTR(err);
3023 }
3024
3025 static int
3026 ctnetlink_create_expect(struct net *net,
3027 const struct nf_conntrack_zone *zone,
3028 const struct nlattr * const cda[],
3029 u_int8_t u3, u32 portid, int report)
3030 {
3031 struct nf_conntrack_tuple tuple, mask, master_tuple;
3032 struct nf_conntrack_tuple_hash *h = NULL;
3033 struct nf_conntrack_helper *helper = NULL;
3034 struct nf_conntrack_expect *exp;
3035 struct nf_conn *ct;
3036 int err;
3037
3038 /* caller guarantees that those three CTA_EXPECT_* exist */
3039 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3040 u3, NULL);
3041 if (err < 0)
3042 return err;
3043 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3044 u3, NULL);
3045 if (err < 0)
3046 return err;
3047 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3048 u3, NULL);
3049 if (err < 0)
3050 return err;
3051
3052 /* Look for master conntrack of this expectation */
3053 h = nf_conntrack_find_get(net, zone, &master_tuple);
3054 if (!h)
3055 return -ENOENT;
3056 ct = nf_ct_tuplehash_to_ctrack(h);
3057
3058 if (cda[CTA_EXPECT_HELP_NAME]) {
3059 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3060
3061 helper = __nf_conntrack_helper_find(helpname, u3,
3062 nf_ct_protonum(ct));
3063 if (helper == NULL) {
3064 #ifdef CONFIG_MODULES
3065 if (request_module("nfct-helper-%s", helpname) < 0) {
3066 err = -EOPNOTSUPP;
3067 goto err_ct;
3068 }
3069 helper = __nf_conntrack_helper_find(helpname, u3,
3070 nf_ct_protonum(ct));
3071 if (helper) {
3072 err = -EAGAIN;
3073 goto err_ct;
3074 }
3075 #endif
3076 err = -EOPNOTSUPP;
3077 goto err_ct;
3078 }
3079 }
3080
3081 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3082 if (IS_ERR(exp)) {
3083 err = PTR_ERR(exp);
3084 goto err_ct;
3085 }
3086
3087 err = nf_ct_expect_related_report(exp, portid, report);
3088 nf_ct_expect_put(exp);
3089 err_ct:
3090 nf_ct_put(ct);
3091 return err;
3092 }
3093
3094 static int
3095 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
3096 const struct nlmsghdr *nlh,
3097 const struct nlattr * const cda[])
3098 {
3099 struct net *net = sock_net(ctnl);
3100 struct nf_conntrack_tuple tuple;
3101 struct nf_conntrack_expect *exp;
3102 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3103 u_int8_t u3 = nfmsg->nfgen_family;
3104 struct nf_conntrack_zone zone;
3105 int err;
3106
3107 if (!cda[CTA_EXPECT_TUPLE]
3108 || !cda[CTA_EXPECT_MASK]
3109 || !cda[CTA_EXPECT_MASTER])
3110 return -EINVAL;
3111
3112 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3113 if (err < 0)
3114 return err;
3115
3116 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3117 u3, NULL);
3118 if (err < 0)
3119 return err;
3120
3121 spin_lock_bh(&nf_conntrack_expect_lock);
3122 exp = __nf_ct_expect_find(net, &zone, &tuple);
3123 if (!exp) {
3124 spin_unlock_bh(&nf_conntrack_expect_lock);
3125 err = -ENOENT;
3126 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3127 err = ctnetlink_create_expect(net, &zone, cda, u3,
3128 NETLINK_CB(skb).portid,
3129 nlmsg_report(nlh));
3130 }
3131 return err;
3132 }
3133
3134 err = -EEXIST;
3135 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3136 err = ctnetlink_change_expect(exp, cda);
3137 spin_unlock_bh(&nf_conntrack_expect_lock);
3138
3139 return err;
3140 }
3141
3142 static int
3143 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3144 const struct ip_conntrack_stat *st)
3145 {
3146 struct nlmsghdr *nlh;
3147 struct nfgenmsg *nfmsg;
3148 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3149
3150 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
3151 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3152 if (nlh == NULL)
3153 goto nlmsg_failure;
3154
3155 nfmsg = nlmsg_data(nlh);
3156 nfmsg->nfgen_family = AF_UNSPEC;
3157 nfmsg->version = NFNETLINK_V0;
3158 nfmsg->res_id = htons(cpu);
3159
3160 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3161 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3162 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3163 goto nla_put_failure;
3164
3165 nlmsg_end(skb, nlh);
3166 return skb->len;
3167
3168 nla_put_failure:
3169 nlmsg_failure:
3170 nlmsg_cancel(skb, nlh);
3171 return -1;
3172 }
3173
3174 static int
3175 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3176 {
3177 int cpu;
3178 struct net *net = sock_net(skb->sk);
3179
3180 if (cb->args[0] == nr_cpu_ids)
3181 return 0;
3182
3183 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3184 const struct ip_conntrack_stat *st;
3185
3186 if (!cpu_possible(cpu))
3187 continue;
3188
3189 st = per_cpu_ptr(net->ct.stat, cpu);
3190 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3191 cb->nlh->nlmsg_seq,
3192 cpu, st) < 0)
3193 break;
3194 }
3195 cb->args[0] = cpu;
3196
3197 return skb->len;
3198 }
3199
3200 static int
3201 ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
3202 const struct nlmsghdr *nlh,
3203 const struct nlattr * const cda[])
3204 {
3205 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3206 struct netlink_dump_control c = {
3207 .dump = ctnetlink_exp_stat_cpu_dump,
3208 };
3209 return netlink_dump_start(ctnl, skb, nlh, &c);
3210 }
3211
3212 return 0;
3213 }
3214
3215 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3216 static struct nf_ct_event_notifier ctnl_notifier = {
3217 .fcn = ctnetlink_conntrack_event,
3218 };
3219
3220 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3221 .fcn = ctnetlink_expect_event,
3222 };
3223 #endif
3224
3225 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3226 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3227 .attr_count = CTA_MAX,
3228 .policy = ct_nla_policy },
3229 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3230 .attr_count = CTA_MAX,
3231 .policy = ct_nla_policy },
3232 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3233 .attr_count = CTA_MAX,
3234 .policy = ct_nla_policy },
3235 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3236 .attr_count = CTA_MAX,
3237 .policy = ct_nla_policy },
3238 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3239 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3240 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3241 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3242 };
3243
3244 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3245 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3246 .attr_count = CTA_EXPECT_MAX,
3247 .policy = exp_nla_policy },
3248 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3249 .attr_count = CTA_EXPECT_MAX,
3250 .policy = exp_nla_policy },
3251 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3252 .attr_count = CTA_EXPECT_MAX,
3253 .policy = exp_nla_policy },
3254 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3255 };
3256
3257 static const struct nfnetlink_subsystem ctnl_subsys = {
3258 .name = "conntrack",
3259 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3260 .cb_count = IPCTNL_MSG_MAX,
3261 .cb = ctnl_cb,
3262 };
3263
3264 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3265 .name = "conntrack_expect",
3266 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3267 .cb_count = IPCTNL_MSG_EXP_MAX,
3268 .cb = ctnl_exp_cb,
3269 };
3270
3271 MODULE_ALIAS("ip_conntrack_netlink");
3272 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3273 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3274
3275 static int __net_init ctnetlink_net_init(struct net *net)
3276 {
3277 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3278 int ret;
3279
3280 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3281 if (ret < 0) {
3282 pr_err("ctnetlink_init: cannot register notifier.\n");
3283 goto err_out;
3284 }
3285
3286 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3287 if (ret < 0) {
3288 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3289 goto err_unreg_notifier;
3290 }
3291 #endif
3292 return 0;
3293
3294 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3295 err_unreg_notifier:
3296 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3297 err_out:
3298 return ret;
3299 #endif
3300 }
3301
3302 static void ctnetlink_net_exit(struct net *net)
3303 {
3304 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3305 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3306 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3307 #endif
3308 }
3309
3310 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3311 {
3312 struct net *net;
3313
3314 list_for_each_entry(net, net_exit_list, exit_list)
3315 ctnetlink_net_exit(net);
3316 }
3317
3318 static struct pernet_operations ctnetlink_net_ops = {
3319 .init = ctnetlink_net_init,
3320 .exit_batch = ctnetlink_net_exit_batch,
3321 };
3322
3323 static int __init ctnetlink_init(void)
3324 {
3325 int ret;
3326
3327 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3328 ret = nfnetlink_subsys_register(&ctnl_subsys);
3329 if (ret < 0) {
3330 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3331 goto err_out;
3332 }
3333
3334 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3335 if (ret < 0) {
3336 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3337 goto err_unreg_subsys;
3338 }
3339
3340 ret = register_pernet_subsys(&ctnetlink_net_ops);
3341 if (ret < 0) {
3342 pr_err("ctnetlink_init: cannot register pernet operations\n");
3343 goto err_unreg_exp_subsys;
3344 }
3345 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3346 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3347 RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
3348 #endif
3349 return 0;
3350
3351 err_unreg_exp_subsys:
3352 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3353 err_unreg_subsys:
3354 nfnetlink_subsys_unregister(&ctnl_subsys);
3355 err_out:
3356 return ret;
3357 }
3358
3359 static void __exit ctnetlink_exit(void)
3360 {
3361 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3362
3363 unregister_pernet_subsys(&ctnetlink_net_ops);
3364 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3365 nfnetlink_subsys_unregister(&ctnl_subsys);
3366 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3367 RCU_INIT_POINTER(nfq_ct_hook, NULL);
3368 #endif
3369 }
3370
3371 module_init(ctnetlink_init);
3372 module_exit(ctnetlink_exit);
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