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 #include <linux/siphash.h>
33
34 #include <linux/netfilter.h>
35 #include <net/netlink.h>
36 #include <net/sock.h>
37 #include <net/netfilter/nf_conntrack.h>
38 #include <net/netfilter/nf_conntrack_core.h>
39 #include <net/netfilter/nf_conntrack_expect.h>
40 #include <net/netfilter/nf_conntrack_helper.h>
41 #include <net/netfilter/nf_conntrack_seqadj.h>
42 #include <net/netfilter/nf_conntrack_l3proto.h>
43 #include <net/netfilter/nf_conntrack_l4proto.h>
44 #include <net/netfilter/nf_conntrack_tuple.h>
45 #include <net/netfilter/nf_conntrack_acct.h>
46 #include <net/netfilter/nf_conntrack_zones.h>
47 #include <net/netfilter/nf_conntrack_timestamp.h>
48 #include <net/netfilter/nf_conntrack_labels.h>
49 #include <net/netfilter/nf_conntrack_seqadj.h>
50 #include <net/netfilter/nf_conntrack_synproxy.h>
51 #ifdef CONFIG_NF_NAT_NEEDED
52 #include <net/netfilter/nf_nat_core.h>
53 #include <net/netfilter/nf_nat_l4proto.h>
54 #include <net/netfilter/nf_nat_helper.h>
55 #endif
56
57 #include <linux/netfilter/nfnetlink.h>
58 #include <linux/netfilter/nfnetlink_conntrack.h>
59
60 MODULE_LICENSE("GPL");
61
62 static char __initdata version[] = "0.93";
63
64 static inline int
65 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
66 const struct nf_conntrack_tuple *tuple,
67 struct nf_conntrack_l4proto *l4proto)
68 {
69 int ret = 0;
70 struct nlattr *nest_parms;
71
72 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
73 if (!nest_parms)
74 goto nla_put_failure;
75 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
76 goto nla_put_failure;
77
78 if (likely(l4proto->tuple_to_nlattr))
79 ret = l4proto->tuple_to_nlattr(skb, tuple);
80
81 nla_nest_end(skb, nest_parms);
82
83 return ret;
84
85 nla_put_failure:
86 return -1;
87 }
88
89 static inline int
90 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
91 const struct nf_conntrack_tuple *tuple,
92 struct nf_conntrack_l3proto *l3proto)
93 {
94 int ret = 0;
95 struct nlattr *nest_parms;
96
97 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
98 if (!nest_parms)
99 goto nla_put_failure;
100
101 if (likely(l3proto->tuple_to_nlattr))
102 ret = l3proto->tuple_to_nlattr(skb, tuple);
103
104 nla_nest_end(skb, nest_parms);
105
106 return ret;
107
108 nla_put_failure:
109 return -1;
110 }
111
112 static int
113 ctnetlink_dump_tuples(struct sk_buff *skb,
114 const struct nf_conntrack_tuple *tuple)
115 {
116 int ret;
117 struct nf_conntrack_l3proto *l3proto;
118 struct nf_conntrack_l4proto *l4proto;
119
120 rcu_read_lock();
121 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
122 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
123
124 if (ret >= 0) {
125 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
126 tuple->dst.protonum);
127 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
128 }
129 rcu_read_unlock();
130 return ret;
131 }
132
133 static inline int
134 ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
135 const struct nf_conntrack_zone *zone, int dir)
136 {
137 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
138 return 0;
139 if (nla_put_be16(skb, attrtype, htons(zone->id)))
140 goto nla_put_failure;
141 return 0;
142
143 nla_put_failure:
144 return -1;
145 }
146
147 static inline int
148 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
149 {
150 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
151 goto nla_put_failure;
152 return 0;
153
154 nla_put_failure:
155 return -1;
156 }
157
158 static inline int
159 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
160 {
161 long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
162
163 if (timeout < 0)
164 timeout = 0;
165
166 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
167 goto nla_put_failure;
168 return 0;
169
170 nla_put_failure:
171 return -1;
172 }
173
174 static inline int
175 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
176 {
177 struct nf_conntrack_l4proto *l4proto;
178 struct nlattr *nest_proto;
179 int ret;
180
181 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
182 if (!l4proto->to_nlattr)
183 return 0;
184
185 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
186 if (!nest_proto)
187 goto nla_put_failure;
188
189 ret = l4proto->to_nlattr(skb, nest_proto, ct);
190
191 nla_nest_end(skb, nest_proto);
192
193 return ret;
194
195 nla_put_failure:
196 return -1;
197 }
198
199 static inline int
200 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
201 {
202 struct nlattr *nest_helper;
203 const struct nf_conn_help *help = nfct_help(ct);
204 struct nf_conntrack_helper *helper;
205
206 if (!help)
207 return 0;
208
209 helper = rcu_dereference(help->helper);
210 if (!helper)
211 goto out;
212
213 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
214 if (!nest_helper)
215 goto nla_put_failure;
216 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
217 goto nla_put_failure;
218
219 if (helper->to_nlattr)
220 helper->to_nlattr(skb, ct);
221
222 nla_nest_end(skb, nest_helper);
223 out:
224 return 0;
225
226 nla_put_failure:
227 return -1;
228 }
229
230 static int
231 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
232 enum ip_conntrack_dir dir, int type)
233 {
234 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
235 struct nf_conn_counter *counter = acct->counter;
236 struct nlattr *nest_count;
237 u64 pkts, bytes;
238
239 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
240 pkts = atomic64_xchg(&counter[dir].packets, 0);
241 bytes = atomic64_xchg(&counter[dir].bytes, 0);
242 } else {
243 pkts = atomic64_read(&counter[dir].packets);
244 bytes = atomic64_read(&counter[dir].bytes);
245 }
246
247 nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
248 if (!nest_count)
249 goto nla_put_failure;
250
251 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts)) ||
252 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes)))
253 goto nla_put_failure;
254
255 nla_nest_end(skb, nest_count);
256
257 return 0;
258
259 nla_put_failure:
260 return -1;
261 }
262
263 static int
264 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
265 {
266 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
267
268 if (!acct)
269 return 0;
270
271 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
272 return -1;
273 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
274 return -1;
275
276 return 0;
277 }
278
279 static int
280 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
281 {
282 struct nlattr *nest_count;
283 const struct nf_conn_tstamp *tstamp;
284
285 tstamp = nf_conn_tstamp_find(ct);
286 if (!tstamp)
287 return 0;
288
289 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
290 if (!nest_count)
291 goto nla_put_failure;
292
293 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start)) ||
294 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
295 cpu_to_be64(tstamp->stop))))
296 goto nla_put_failure;
297 nla_nest_end(skb, nest_count);
298
299 return 0;
300
301 nla_put_failure:
302 return -1;
303 }
304
305 #ifdef CONFIG_NF_CONNTRACK_MARK
306 static inline int
307 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
308 {
309 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
310 goto nla_put_failure;
311 return 0;
312
313 nla_put_failure:
314 return -1;
315 }
316 #else
317 #define ctnetlink_dump_mark(a, b) (0)
318 #endif
319
320 #ifdef CONFIG_NF_CONNTRACK_SECMARK
321 static inline int
322 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
323 {
324 struct nlattr *nest_secctx;
325 int len, ret;
326 char *secctx;
327
328 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
329 if (ret)
330 return 0;
331
332 ret = -1;
333 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
334 if (!nest_secctx)
335 goto nla_put_failure;
336
337 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
338 goto nla_put_failure;
339 nla_nest_end(skb, nest_secctx);
340
341 ret = 0;
342 nla_put_failure:
343 security_release_secctx(secctx, len);
344 return ret;
345 }
346 #else
347 #define ctnetlink_dump_secctx(a, b) (0)
348 #endif
349
350 #ifdef CONFIG_NF_CONNTRACK_LABELS
351 static int ctnetlink_label_size(const struct nf_conn *ct)
352 {
353 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
354
355 if (!labels)
356 return 0;
357 return nla_total_size(labels->words * sizeof(long));
358 }
359
360 static int
361 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
362 {
363 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
364 unsigned int len, i;
365
366 if (!labels)
367 return 0;
368
369 len = labels->words * sizeof(long);
370 i = 0;
371 do {
372 if (labels->bits[i] != 0)
373 return nla_put(skb, CTA_LABELS, len, labels->bits);
374 i++;
375 } while (i < labels->words);
376
377 return 0;
378 }
379 #else
380 #define ctnetlink_dump_labels(a, b) (0)
381 #define ctnetlink_label_size(a) (0)
382 #endif
383
384 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
385
386 static inline int
387 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
388 {
389 struct nlattr *nest_parms;
390
391 if (!(ct->status & IPS_EXPECTED))
392 return 0;
393
394 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
395 if (!nest_parms)
396 goto nla_put_failure;
397 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
398 goto nla_put_failure;
399 nla_nest_end(skb, nest_parms);
400
401 return 0;
402
403 nla_put_failure:
404 return -1;
405 }
406
407 static int
408 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
409 {
410 struct nlattr *nest_parms;
411
412 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
413 if (!nest_parms)
414 goto nla_put_failure;
415
416 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
417 htonl(seq->correction_pos)) ||
418 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
419 htonl(seq->offset_before)) ||
420 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
421 htonl(seq->offset_after)))
422 goto nla_put_failure;
423
424 nla_nest_end(skb, nest_parms);
425
426 return 0;
427
428 nla_put_failure:
429 return -1;
430 }
431
432 static inline int
433 ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
434 {
435 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
436 struct nf_ct_seqadj *seq;
437
438 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
439 return 0;
440
441 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
442 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
443 return -1;
444
445 seq = &seqadj->seq[IP_CT_DIR_REPLY];
446 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
447 return -1;
448
449 return 0;
450 }
451
452 static inline int
453 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
454 {
455 __be32 id = (__force __be32)nf_ct_get_id(ct);
456
457 if (nla_put_be32(skb, CTA_ID, id))
458 goto nla_put_failure;
459 return 0;
460
461 nla_put_failure:
462 return -1;
463 }
464
465 static inline int
466 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
467 {
468 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
469 goto nla_put_failure;
470 return 0;
471
472 nla_put_failure:
473 return -1;
474 }
475
476 static int
477 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
478 struct nf_conn *ct)
479 {
480 const struct nf_conntrack_zone *zone;
481 struct nlmsghdr *nlh;
482 struct nfgenmsg *nfmsg;
483 struct nlattr *nest_parms;
484 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
485
486 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
487 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
488 if (nlh == NULL)
489 goto nlmsg_failure;
490
491 nfmsg = nlmsg_data(nlh);
492 nfmsg->nfgen_family = nf_ct_l3num(ct);
493 nfmsg->version = NFNETLINK_V0;
494 nfmsg->res_id = 0;
495
496 zone = nf_ct_zone(ct);
497
498 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
499 if (!nest_parms)
500 goto nla_put_failure;
501 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
502 goto nla_put_failure;
503 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
504 NF_CT_ZONE_DIR_ORIG) < 0)
505 goto nla_put_failure;
506 nla_nest_end(skb, nest_parms);
507
508 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
509 if (!nest_parms)
510 goto nla_put_failure;
511 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
512 goto nla_put_failure;
513 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
514 NF_CT_ZONE_DIR_REPL) < 0)
515 goto nla_put_failure;
516 nla_nest_end(skb, nest_parms);
517
518 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
519 NF_CT_DEFAULT_ZONE_DIR) < 0)
520 goto nla_put_failure;
521
522 if (ctnetlink_dump_status(skb, ct) < 0 ||
523 ctnetlink_dump_timeout(skb, ct) < 0 ||
524 ctnetlink_dump_acct(skb, ct, type) < 0 ||
525 ctnetlink_dump_timestamp(skb, ct) < 0 ||
526 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
527 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
528 ctnetlink_dump_mark(skb, ct) < 0 ||
529 ctnetlink_dump_secctx(skb, ct) < 0 ||
530 ctnetlink_dump_labels(skb, ct) < 0 ||
531 ctnetlink_dump_id(skb, ct) < 0 ||
532 ctnetlink_dump_use(skb, ct) < 0 ||
533 ctnetlink_dump_master(skb, ct) < 0 ||
534 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
535 goto nla_put_failure;
536
537 nlmsg_end(skb, nlh);
538 return skb->len;
539
540 nlmsg_failure:
541 nla_put_failure:
542 nlmsg_cancel(skb, nlh);
543 return -1;
544 }
545
546 static inline size_t
547 ctnetlink_proto_size(const struct nf_conn *ct)
548 {
549 struct nf_conntrack_l3proto *l3proto;
550 struct nf_conntrack_l4proto *l4proto;
551 size_t len = 0;
552
553 rcu_read_lock();
554 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
555 len += l3proto->nla_size;
556
557 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
558 len += l4proto->nla_size;
559 rcu_read_unlock();
560
561 return len;
562 }
563
564 static inline size_t
565 ctnetlink_acct_size(const struct nf_conn *ct)
566 {
567 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
568 return 0;
569 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
570 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
571 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
572 ;
573 }
574
575 static inline int
576 ctnetlink_secctx_size(const struct nf_conn *ct)
577 {
578 #ifdef CONFIG_NF_CONNTRACK_SECMARK
579 int len, ret;
580
581 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
582 if (ret)
583 return 0;
584
585 return nla_total_size(0) /* CTA_SECCTX */
586 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
587 #else
588 return 0;
589 #endif
590 }
591
592 static inline size_t
593 ctnetlink_timestamp_size(const struct nf_conn *ct)
594 {
595 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
596 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
597 return 0;
598 return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
599 #else
600 return 0;
601 #endif
602 }
603
604 static inline size_t
605 ctnetlink_nlmsg_size(const struct nf_conn *ct)
606 {
607 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
608 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
609 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
610 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
611 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
612 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
613 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
614 + ctnetlink_acct_size(ct)
615 + ctnetlink_timestamp_size(ct)
616 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
617 + nla_total_size(0) /* CTA_PROTOINFO */
618 + nla_total_size(0) /* CTA_HELP */
619 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
620 + ctnetlink_secctx_size(ct)
621 #ifdef CONFIG_NF_NAT_NEEDED
622 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
623 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
624 #endif
625 #ifdef CONFIG_NF_CONNTRACK_MARK
626 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
627 #endif
628 #ifdef CONFIG_NF_CONNTRACK_ZONES
629 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
630 #endif
631 + ctnetlink_proto_size(ct)
632 + ctnetlink_label_size(ct)
633 ;
634 }
635
636 #ifdef CONFIG_NF_CONNTRACK_EVENTS
637 static int
638 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
639 {
640 const struct nf_conntrack_zone *zone;
641 struct net *net;
642 struct nlmsghdr *nlh;
643 struct nfgenmsg *nfmsg;
644 struct nlattr *nest_parms;
645 struct nf_conn *ct = item->ct;
646 struct sk_buff *skb;
647 unsigned int type;
648 unsigned int flags = 0, group;
649 int err;
650
651 /* ignore our fake conntrack entry */
652 if (nf_ct_is_untracked(ct))
653 return 0;
654
655 if (events & (1 << IPCT_DESTROY)) {
656 type = IPCTNL_MSG_CT_DELETE;
657 group = NFNLGRP_CONNTRACK_DESTROY;
658 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
659 type = IPCTNL_MSG_CT_NEW;
660 flags = NLM_F_CREATE|NLM_F_EXCL;
661 group = NFNLGRP_CONNTRACK_NEW;
662 } else if (events) {
663 type = IPCTNL_MSG_CT_NEW;
664 group = NFNLGRP_CONNTRACK_UPDATE;
665 } else
666 return 0;
667
668 net = nf_ct_net(ct);
669 if (!item->report && !nfnetlink_has_listeners(net, group))
670 return 0;
671
672 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
673 if (skb == NULL)
674 goto errout;
675
676 type |= NFNL_SUBSYS_CTNETLINK << 8;
677 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
678 if (nlh == NULL)
679 goto nlmsg_failure;
680
681 nfmsg = nlmsg_data(nlh);
682 nfmsg->nfgen_family = nf_ct_l3num(ct);
683 nfmsg->version = NFNETLINK_V0;
684 nfmsg->res_id = 0;
685
686 rcu_read_lock();
687 zone = nf_ct_zone(ct);
688
689 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
690 if (!nest_parms)
691 goto nla_put_failure;
692 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
693 goto nla_put_failure;
694 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
695 NF_CT_ZONE_DIR_ORIG) < 0)
696 goto nla_put_failure;
697 nla_nest_end(skb, nest_parms);
698
699 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
700 if (!nest_parms)
701 goto nla_put_failure;
702 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
703 goto nla_put_failure;
704 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
705 NF_CT_ZONE_DIR_REPL) < 0)
706 goto nla_put_failure;
707 nla_nest_end(skb, nest_parms);
708
709 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
710 NF_CT_DEFAULT_ZONE_DIR) < 0)
711 goto nla_put_failure;
712
713 if (ctnetlink_dump_id(skb, ct) < 0)
714 goto nla_put_failure;
715
716 if (ctnetlink_dump_status(skb, ct) < 0)
717 goto nla_put_failure;
718
719 if (events & (1 << IPCT_DESTROY)) {
720 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
721 ctnetlink_dump_timestamp(skb, ct) < 0)
722 goto nla_put_failure;
723 } else {
724 if (ctnetlink_dump_timeout(skb, ct) < 0)
725 goto nla_put_failure;
726
727 if (events & (1 << IPCT_PROTOINFO)
728 && ctnetlink_dump_protoinfo(skb, ct) < 0)
729 goto nla_put_failure;
730
731 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
732 && ctnetlink_dump_helpinfo(skb, ct) < 0)
733 goto nla_put_failure;
734
735 #ifdef CONFIG_NF_CONNTRACK_SECMARK
736 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
737 && ctnetlink_dump_secctx(skb, ct) < 0)
738 goto nla_put_failure;
739 #endif
740 if (events & (1 << IPCT_LABEL) &&
741 ctnetlink_dump_labels(skb, ct) < 0)
742 goto nla_put_failure;
743
744 if (events & (1 << IPCT_RELATED) &&
745 ctnetlink_dump_master(skb, ct) < 0)
746 goto nla_put_failure;
747
748 if (events & (1 << IPCT_SEQADJ) &&
749 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
750 goto nla_put_failure;
751 }
752
753 #ifdef CONFIG_NF_CONNTRACK_MARK
754 if ((events & (1 << IPCT_MARK) || ct->mark)
755 && ctnetlink_dump_mark(skb, ct) < 0)
756 goto nla_put_failure;
757 #endif
758 rcu_read_unlock();
759
760 nlmsg_end(skb, nlh);
761 err = nfnetlink_send(skb, net, item->portid, group, item->report,
762 GFP_ATOMIC);
763 if (err == -ENOBUFS || err == -EAGAIN)
764 return -ENOBUFS;
765
766 return 0;
767
768 nla_put_failure:
769 rcu_read_unlock();
770 nlmsg_cancel(skb, nlh);
771 nlmsg_failure:
772 kfree_skb(skb);
773 errout:
774 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
775 return -ENOBUFS;
776
777 return 0;
778 }
779 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
780
781 static int ctnetlink_done(struct netlink_callback *cb)
782 {
783 if (cb->args[1])
784 nf_ct_put((struct nf_conn *)cb->args[1]);
785 kfree(cb->data);
786 return 0;
787 }
788
789 struct ctnetlink_filter {
790 struct {
791 u_int32_t val;
792 u_int32_t mask;
793 } mark;
794 };
795
796 static struct ctnetlink_filter *
797 ctnetlink_alloc_filter(const struct nlattr * const cda[])
798 {
799 #ifdef CONFIG_NF_CONNTRACK_MARK
800 struct ctnetlink_filter *filter;
801
802 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
803 if (filter == NULL)
804 return ERR_PTR(-ENOMEM);
805
806 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
807 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
808
809 return filter;
810 #else
811 return ERR_PTR(-EOPNOTSUPP);
812 #endif
813 }
814
815 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
816 {
817 struct ctnetlink_filter *filter = data;
818
819 if (filter == NULL)
820 return 1;
821
822 #ifdef CONFIG_NF_CONNTRACK_MARK
823 if ((ct->mark & filter->mark.mask) == filter->mark.val)
824 return 1;
825 #endif
826
827 return 0;
828 }
829
830 static int
831 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
832 {
833 struct net *net = sock_net(skb->sk);
834 struct nf_conn *ct, *last;
835 struct nf_conntrack_tuple_hash *h;
836 struct hlist_nulls_node *n;
837 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
838 u_int8_t l3proto = nfmsg->nfgen_family;
839 int res;
840 spinlock_t *lockp;
841
842 last = (struct nf_conn *)cb->args[1];
843
844 local_bh_disable();
845 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
846 restart:
847 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
848 spin_lock(lockp);
849 if (cb->args[0] >= net->ct.htable_size) {
850 spin_unlock(lockp);
851 goto out;
852 }
853 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
854 hnnode) {
855 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
856 continue;
857 ct = nf_ct_tuplehash_to_ctrack(h);
858 /* Dump entries of a given L3 protocol number.
859 * If it is not specified, ie. l3proto == 0,
860 * then dump everything. */
861 if (l3proto && nf_ct_l3num(ct) != l3proto)
862 continue;
863 if (cb->args[1]) {
864 if (ct != last)
865 continue;
866 cb->args[1] = 0;
867 }
868 if (!ctnetlink_filter_match(ct, cb->data))
869 continue;
870
871 rcu_read_lock();
872 res =
873 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
874 cb->nlh->nlmsg_seq,
875 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
876 ct);
877 rcu_read_unlock();
878 if (res < 0) {
879 nf_conntrack_get(&ct->ct_general);
880 cb->args[1] = (unsigned long)ct;
881 spin_unlock(lockp);
882 goto out;
883 }
884 }
885 spin_unlock(lockp);
886 if (cb->args[1]) {
887 cb->args[1] = 0;
888 goto restart;
889 }
890 }
891 out:
892 local_bh_enable();
893 if (last) {
894 /* nf ct hash resize happened, now clear the leftover. */
895 if ((struct nf_conn *)cb->args[1] == last)
896 cb->args[1] = 0;
897
898 nf_ct_put(last);
899 }
900
901 return skb->len;
902 }
903
904 static inline int
905 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
906 {
907 struct nlattr *tb[CTA_IP_MAX+1];
908 struct nf_conntrack_l3proto *l3proto;
909 int ret = 0;
910
911 ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
912 if (ret < 0)
913 return ret;
914
915 rcu_read_lock();
916 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
917
918 if (likely(l3proto->nlattr_to_tuple)) {
919 ret = nla_validate_nested(attr, CTA_IP_MAX,
920 l3proto->nla_policy);
921 if (ret == 0)
922 ret = l3proto->nlattr_to_tuple(tb, tuple);
923 }
924
925 rcu_read_unlock();
926
927 return ret;
928 }
929
930 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
931 [CTA_PROTO_NUM] = { .type = NLA_U8 },
932 };
933
934 static inline int
935 ctnetlink_parse_tuple_proto(struct nlattr *attr,
936 struct nf_conntrack_tuple *tuple)
937 {
938 struct nlattr *tb[CTA_PROTO_MAX+1];
939 struct nf_conntrack_l4proto *l4proto;
940 int ret = 0;
941
942 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
943 if (ret < 0)
944 return ret;
945
946 if (!tb[CTA_PROTO_NUM])
947 return -EINVAL;
948 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
949
950 rcu_read_lock();
951 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
952
953 if (likely(l4proto->nlattr_to_tuple)) {
954 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
955 l4proto->nla_policy);
956 if (ret == 0)
957 ret = l4proto->nlattr_to_tuple(tb, tuple);
958 }
959
960 rcu_read_unlock();
961
962 return ret;
963 }
964
965 static int
966 ctnetlink_parse_zone(const struct nlattr *attr,
967 struct nf_conntrack_zone *zone)
968 {
969 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
970 NF_CT_DEFAULT_ZONE_DIR, 0);
971 #ifdef CONFIG_NF_CONNTRACK_ZONES
972 if (attr)
973 zone->id = ntohs(nla_get_be16(attr));
974 #else
975 if (attr)
976 return -EOPNOTSUPP;
977 #endif
978 return 0;
979 }
980
981 static int
982 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
983 struct nf_conntrack_zone *zone)
984 {
985 int ret;
986
987 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
988 return -EINVAL;
989
990 ret = ctnetlink_parse_zone(attr, zone);
991 if (ret < 0)
992 return ret;
993
994 if (type == CTA_TUPLE_REPLY)
995 zone->dir = NF_CT_ZONE_DIR_REPL;
996 else
997 zone->dir = NF_CT_ZONE_DIR_ORIG;
998
999 return 0;
1000 }
1001
1002 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1003 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1004 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1005 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1006 };
1007
1008 static int
1009 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1010 struct nf_conntrack_tuple *tuple, u32 type,
1011 u_int8_t l3num, struct nf_conntrack_zone *zone)
1012 {
1013 struct nlattr *tb[CTA_TUPLE_MAX+1];
1014 int err;
1015
1016 memset(tuple, 0, sizeof(*tuple));
1017
1018 err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
1019 if (err < 0)
1020 return err;
1021
1022 if (!tb[CTA_TUPLE_IP])
1023 return -EINVAL;
1024
1025 if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1026 return -EOPNOTSUPP;
1027 tuple->src.l3num = l3num;
1028
1029 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
1030 if (err < 0)
1031 return err;
1032
1033 if (!tb[CTA_TUPLE_PROTO])
1034 return -EINVAL;
1035
1036 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
1037 if (err < 0)
1038 return err;
1039
1040 if (tb[CTA_TUPLE_ZONE]) {
1041 if (!zone)
1042 return -EINVAL;
1043
1044 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1045 type, zone);
1046 if (err < 0)
1047 return err;
1048 }
1049
1050 /* orig and expect tuples get DIR_ORIGINAL */
1051 if (type == CTA_TUPLE_REPLY)
1052 tuple->dst.dir = IP_CT_DIR_REPLY;
1053 else
1054 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1055
1056 return 0;
1057 }
1058
1059 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1060 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1061 .len = NF_CT_HELPER_NAME_LEN - 1 },
1062 };
1063
1064 static inline int
1065 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1066 struct nlattr **helpinfo)
1067 {
1068 int err;
1069 struct nlattr *tb[CTA_HELP_MAX+1];
1070
1071 err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
1072 if (err < 0)
1073 return err;
1074
1075 if (!tb[CTA_HELP_NAME])
1076 return -EINVAL;
1077
1078 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1079
1080 if (tb[CTA_HELP_INFO])
1081 *helpinfo = tb[CTA_HELP_INFO];
1082
1083 return 0;
1084 }
1085
1086 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1087 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1088 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1089 [CTA_STATUS] = { .type = NLA_U32 },
1090 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1091 [CTA_HELP] = { .type = NLA_NESTED },
1092 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1093 [CTA_TIMEOUT] = { .type = NLA_U32 },
1094 [CTA_MARK] = { .type = NLA_U32 },
1095 [CTA_ID] = { .type = NLA_U32 },
1096 [CTA_NAT_DST] = { .type = NLA_NESTED },
1097 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1098 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1099 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1100 [CTA_ZONE] = { .type = NLA_U16 },
1101 [CTA_MARK_MASK] = { .type = NLA_U32 },
1102 [CTA_LABELS] = { .type = NLA_BINARY,
1103 .len = NF_CT_LABELS_MAX_SIZE },
1104 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1105 .len = NF_CT_LABELS_MAX_SIZE },
1106 };
1107
1108 static int ctnetlink_flush_conntrack(struct net *net,
1109 const struct nlattr * const cda[],
1110 u32 portid, int report)
1111 {
1112 struct ctnetlink_filter *filter = NULL;
1113
1114 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1115 filter = ctnetlink_alloc_filter(cda);
1116 if (IS_ERR(filter))
1117 return PTR_ERR(filter);
1118 }
1119
1120 nf_ct_iterate_cleanup(net, ctnetlink_filter_match, filter,
1121 portid, report);
1122 kfree(filter);
1123
1124 return 0;
1125 }
1126
1127 static int
1128 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
1129 const struct nlmsghdr *nlh,
1130 const struct nlattr * const cda[])
1131 {
1132 struct net *net = sock_net(ctnl);
1133 struct nf_conntrack_tuple_hash *h;
1134 struct nf_conntrack_tuple tuple;
1135 struct nf_conn *ct;
1136 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1137 u_int8_t u3 = nfmsg->nfgen_family;
1138 struct nf_conntrack_zone zone;
1139 int err;
1140
1141 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1142 if (err < 0)
1143 return err;
1144
1145 if (cda[CTA_TUPLE_ORIG])
1146 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1147 u3, &zone);
1148 else if (cda[CTA_TUPLE_REPLY])
1149 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1150 u3, &zone);
1151 else {
1152 return ctnetlink_flush_conntrack(net, cda,
1153 NETLINK_CB(skb).portid,
1154 nlmsg_report(nlh));
1155 }
1156
1157 if (err < 0)
1158 return err;
1159
1160 h = nf_conntrack_find_get(net, &zone, &tuple);
1161 if (!h)
1162 return -ENOENT;
1163
1164 ct = nf_ct_tuplehash_to_ctrack(h);
1165
1166 if (cda[CTA_ID]) {
1167 __be32 id = nla_get_be32(cda[CTA_ID]);
1168
1169 if (id != (__force __be32)nf_ct_get_id(ct)) {
1170 nf_ct_put(ct);
1171 return -ENOENT;
1172 }
1173 }
1174
1175 if (del_timer(&ct->timeout))
1176 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1177
1178 nf_ct_put(ct);
1179
1180 return 0;
1181 }
1182
1183 static int
1184 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
1185 const struct nlmsghdr *nlh,
1186 const struct nlattr * const cda[])
1187 {
1188 struct net *net = sock_net(ctnl);
1189 struct nf_conntrack_tuple_hash *h;
1190 struct nf_conntrack_tuple tuple;
1191 struct nf_conn *ct;
1192 struct sk_buff *skb2 = NULL;
1193 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1194 u_int8_t u3 = nfmsg->nfgen_family;
1195 struct nf_conntrack_zone zone;
1196 int err;
1197
1198 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1199 struct netlink_dump_control c = {
1200 .dump = ctnetlink_dump_table,
1201 .done = ctnetlink_done,
1202 };
1203
1204 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1205 struct ctnetlink_filter *filter;
1206
1207 filter = ctnetlink_alloc_filter(cda);
1208 if (IS_ERR(filter))
1209 return PTR_ERR(filter);
1210
1211 c.data = filter;
1212 }
1213 return netlink_dump_start(ctnl, skb, nlh, &c);
1214 }
1215
1216 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1217 if (err < 0)
1218 return err;
1219
1220 if (cda[CTA_TUPLE_ORIG])
1221 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1222 u3, &zone);
1223 else if (cda[CTA_TUPLE_REPLY])
1224 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1225 u3, &zone);
1226 else
1227 return -EINVAL;
1228
1229 if (err < 0)
1230 return err;
1231
1232 h = nf_conntrack_find_get(net, &zone, &tuple);
1233 if (!h)
1234 return -ENOENT;
1235
1236 ct = nf_ct_tuplehash_to_ctrack(h);
1237
1238 err = -ENOMEM;
1239 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1240 if (skb2 == NULL) {
1241 nf_ct_put(ct);
1242 return -ENOMEM;
1243 }
1244
1245 rcu_read_lock();
1246 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1247 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1248 rcu_read_unlock();
1249 nf_ct_put(ct);
1250 if (err <= 0)
1251 goto free;
1252
1253 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1254 if (err < 0)
1255 goto out;
1256
1257 return 0;
1258
1259 free:
1260 kfree_skb(skb2);
1261 out:
1262 /* this avoids a loop in nfnetlink. */
1263 return err == -EAGAIN ? -ENOBUFS : err;
1264 }
1265
1266 static int ctnetlink_done_list(struct netlink_callback *cb)
1267 {
1268 if (cb->args[1])
1269 nf_ct_put((struct nf_conn *)cb->args[1]);
1270 return 0;
1271 }
1272
1273 static int
1274 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1275 {
1276 struct nf_conn *ct, *last;
1277 struct nf_conntrack_tuple_hash *h;
1278 struct hlist_nulls_node *n;
1279 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1280 u_int8_t l3proto = nfmsg->nfgen_family;
1281 int res;
1282 int cpu;
1283 struct hlist_nulls_head *list;
1284 struct net *net = sock_net(skb->sk);
1285
1286 if (cb->args[2])
1287 return 0;
1288
1289 last = (struct nf_conn *)cb->args[1];
1290
1291 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1292 struct ct_pcpu *pcpu;
1293
1294 if (!cpu_possible(cpu))
1295 continue;
1296
1297 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1298 spin_lock_bh(&pcpu->lock);
1299 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1300 restart:
1301 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1302 ct = nf_ct_tuplehash_to_ctrack(h);
1303 if (l3proto && nf_ct_l3num(ct) != l3proto)
1304 continue;
1305 if (cb->args[1]) {
1306 if (ct != last)
1307 continue;
1308 cb->args[1] = 0;
1309 }
1310 rcu_read_lock();
1311 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1312 cb->nlh->nlmsg_seq,
1313 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1314 ct);
1315 rcu_read_unlock();
1316 if (res < 0) {
1317 if (!atomic_inc_not_zero(&ct->ct_general.use))
1318 continue;
1319 cb->args[0] = cpu;
1320 cb->args[1] = (unsigned long)ct;
1321 spin_unlock_bh(&pcpu->lock);
1322 goto out;
1323 }
1324 }
1325 if (cb->args[1]) {
1326 cb->args[1] = 0;
1327 goto restart;
1328 }
1329 spin_unlock_bh(&pcpu->lock);
1330 }
1331 cb->args[2] = 1;
1332 out:
1333 if (last)
1334 nf_ct_put(last);
1335
1336 return skb->len;
1337 }
1338
1339 static int
1340 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1341 {
1342 return ctnetlink_dump_list(skb, cb, true);
1343 }
1344
1345 static int
1346 ctnetlink_get_ct_dying(struct sock *ctnl, struct sk_buff *skb,
1347 const struct nlmsghdr *nlh,
1348 const struct nlattr * const cda[])
1349 {
1350 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1351 struct netlink_dump_control c = {
1352 .dump = ctnetlink_dump_dying,
1353 .done = ctnetlink_done_list,
1354 };
1355 return netlink_dump_start(ctnl, skb, nlh, &c);
1356 }
1357
1358 return -EOPNOTSUPP;
1359 }
1360
1361 static int
1362 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1363 {
1364 return ctnetlink_dump_list(skb, cb, false);
1365 }
1366
1367 static int
1368 ctnetlink_get_ct_unconfirmed(struct sock *ctnl, struct sk_buff *skb,
1369 const struct nlmsghdr *nlh,
1370 const struct nlattr * const cda[])
1371 {
1372 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1373 struct netlink_dump_control c = {
1374 .dump = ctnetlink_dump_unconfirmed,
1375 .done = ctnetlink_done_list,
1376 };
1377 return netlink_dump_start(ctnl, skb, nlh, &c);
1378 }
1379
1380 return -EOPNOTSUPP;
1381 }
1382
1383 #ifdef CONFIG_NF_NAT_NEEDED
1384 static int
1385 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1386 enum nf_nat_manip_type manip,
1387 const struct nlattr *attr)
1388 {
1389 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1390 int err;
1391
1392 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1393 if (!parse_nat_setup) {
1394 #ifdef CONFIG_MODULES
1395 rcu_read_unlock();
1396 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1397 if (request_module("nf-nat") < 0) {
1398 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1399 rcu_read_lock();
1400 return -EOPNOTSUPP;
1401 }
1402 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1403 rcu_read_lock();
1404 if (nfnetlink_parse_nat_setup_hook)
1405 return -EAGAIN;
1406 #endif
1407 return -EOPNOTSUPP;
1408 }
1409
1410 err = parse_nat_setup(ct, manip, attr);
1411 if (err == -EAGAIN) {
1412 #ifdef CONFIG_MODULES
1413 rcu_read_unlock();
1414 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1415 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1416 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1417 rcu_read_lock();
1418 return -EOPNOTSUPP;
1419 }
1420 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1421 rcu_read_lock();
1422 #else
1423 err = -EOPNOTSUPP;
1424 #endif
1425 }
1426 return err;
1427 }
1428 #endif
1429
1430 static int
1431 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1432 {
1433 unsigned long d;
1434 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1435 d = ct->status ^ status;
1436
1437 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1438 /* unchangeable */
1439 return -EBUSY;
1440
1441 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1442 /* SEEN_REPLY bit can only be set */
1443 return -EBUSY;
1444
1445 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1446 /* ASSURED bit can only be set */
1447 return -EBUSY;
1448
1449 /* Be careful here, modifying NAT bits can screw up things,
1450 * so don't let users modify them directly if they don't pass
1451 * nf_nat_range. */
1452 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1453 return 0;
1454 }
1455
1456 static int
1457 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1458 {
1459 #ifdef CONFIG_NF_NAT_NEEDED
1460 int ret;
1461
1462 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1463 return 0;
1464
1465 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1466 cda[CTA_NAT_DST]);
1467 if (ret < 0)
1468 return ret;
1469
1470 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1471 cda[CTA_NAT_SRC]);
1472 return ret;
1473 #else
1474 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1475 return 0;
1476 return -EOPNOTSUPP;
1477 #endif
1478 }
1479
1480 static inline int
1481 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1482 {
1483 struct nf_conntrack_helper *helper;
1484 struct nf_conn_help *help = nfct_help(ct);
1485 char *helpname = NULL;
1486 struct nlattr *helpinfo = NULL;
1487 int err;
1488
1489 /* don't change helper of sibling connections */
1490 if (ct->master)
1491 return -EBUSY;
1492
1493 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1494 if (err < 0)
1495 return err;
1496
1497 if (!strcmp(helpname, "")) {
1498 if (help && help->helper) {
1499 /* we had a helper before ... */
1500 nf_ct_remove_expectations(ct);
1501 RCU_INIT_POINTER(help->helper, NULL);
1502 }
1503
1504 return 0;
1505 }
1506
1507 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1508 nf_ct_protonum(ct));
1509 if (helper == NULL) {
1510 #ifdef CONFIG_MODULES
1511 spin_unlock_bh(&nf_conntrack_expect_lock);
1512
1513 if (request_module("nfct-helper-%s", helpname) < 0) {
1514 spin_lock_bh(&nf_conntrack_expect_lock);
1515 return -EOPNOTSUPP;
1516 }
1517
1518 spin_lock_bh(&nf_conntrack_expect_lock);
1519 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1520 nf_ct_protonum(ct));
1521 if (helper)
1522 return -EAGAIN;
1523 #endif
1524 return -EOPNOTSUPP;
1525 }
1526
1527 if (help) {
1528 if (help->helper == helper) {
1529 /* update private helper data if allowed. */
1530 if (helper->from_nlattr)
1531 helper->from_nlattr(helpinfo, ct);
1532 return 0;
1533 } else
1534 return -EBUSY;
1535 }
1536
1537 /* we cannot set a helper for an existing conntrack */
1538 return -EOPNOTSUPP;
1539 }
1540
1541 static inline int
1542 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1543 {
1544 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1545
1546 if (!del_timer(&ct->timeout))
1547 return -ETIME;
1548
1549 ct->timeout.expires = jiffies + timeout * HZ;
1550 add_timer(&ct->timeout);
1551
1552 return 0;
1553 }
1554
1555 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1556 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1557 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1558 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1559 };
1560
1561 static inline int
1562 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1563 {
1564 const struct nlattr *attr = cda[CTA_PROTOINFO];
1565 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1566 struct nf_conntrack_l4proto *l4proto;
1567 int err = 0;
1568
1569 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1570 if (err < 0)
1571 return err;
1572
1573 rcu_read_lock();
1574 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1575 if (l4proto->from_nlattr)
1576 err = l4proto->from_nlattr(tb, ct);
1577 rcu_read_unlock();
1578
1579 return err;
1580 }
1581
1582 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1583 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1584 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1585 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1586 };
1587
1588 static inline int
1589 change_seq_adj(struct nf_ct_seqadj *seq, const struct nlattr * const attr)
1590 {
1591 int err;
1592 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1593
1594 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1595 if (err < 0)
1596 return err;
1597
1598 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1599 return -EINVAL;
1600
1601 seq->correction_pos =
1602 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1603
1604 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1605 return -EINVAL;
1606
1607 seq->offset_before =
1608 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1609
1610 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1611 return -EINVAL;
1612
1613 seq->offset_after =
1614 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1615
1616 return 0;
1617 }
1618
1619 static int
1620 ctnetlink_change_seq_adj(struct nf_conn *ct,
1621 const struct nlattr * const cda[])
1622 {
1623 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1624 int ret = 0;
1625
1626 if (!seqadj)
1627 return 0;
1628
1629 if (cda[CTA_SEQ_ADJ_ORIG]) {
1630 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1631 cda[CTA_SEQ_ADJ_ORIG]);
1632 if (ret < 0)
1633 return ret;
1634
1635 ct->status |= IPS_SEQ_ADJUST;
1636 }
1637
1638 if (cda[CTA_SEQ_ADJ_REPLY]) {
1639 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1640 cda[CTA_SEQ_ADJ_REPLY]);
1641 if (ret < 0)
1642 return ret;
1643
1644 ct->status |= IPS_SEQ_ADJUST;
1645 }
1646
1647 return 0;
1648 }
1649
1650 static int
1651 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1652 {
1653 #ifdef CONFIG_NF_CONNTRACK_LABELS
1654 size_t len = nla_len(cda[CTA_LABELS]);
1655 const void *mask = cda[CTA_LABELS_MASK];
1656
1657 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1658 return -EINVAL;
1659
1660 if (mask) {
1661 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1662 nla_len(cda[CTA_LABELS_MASK]) != len)
1663 return -EINVAL;
1664 mask = nla_data(cda[CTA_LABELS_MASK]);
1665 }
1666
1667 len /= sizeof(u32);
1668
1669 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1670 #else
1671 return -EOPNOTSUPP;
1672 #endif
1673 }
1674
1675 static int
1676 ctnetlink_change_conntrack(struct nf_conn *ct,
1677 const struct nlattr * const cda[])
1678 {
1679 int err;
1680
1681 /* only allow NAT changes and master assignation for new conntracks */
1682 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1683 return -EOPNOTSUPP;
1684
1685 if (cda[CTA_HELP]) {
1686 err = ctnetlink_change_helper(ct, cda);
1687 if (err < 0)
1688 return err;
1689 }
1690
1691 if (cda[CTA_TIMEOUT]) {
1692 err = ctnetlink_change_timeout(ct, cda);
1693 if (err < 0)
1694 return err;
1695 }
1696
1697 if (cda[CTA_STATUS]) {
1698 err = ctnetlink_change_status(ct, cda);
1699 if (err < 0)
1700 return err;
1701 }
1702
1703 if (cda[CTA_PROTOINFO]) {
1704 err = ctnetlink_change_protoinfo(ct, cda);
1705 if (err < 0)
1706 return err;
1707 }
1708
1709 #if defined(CONFIG_NF_CONNTRACK_MARK)
1710 if (cda[CTA_MARK])
1711 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1712 #endif
1713
1714 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1715 err = ctnetlink_change_seq_adj(ct, cda);
1716 if (err < 0)
1717 return err;
1718 }
1719
1720 if (cda[CTA_LABELS]) {
1721 err = ctnetlink_attach_labels(ct, cda);
1722 if (err < 0)
1723 return err;
1724 }
1725
1726 return 0;
1727 }
1728
1729 static struct nf_conn *
1730 ctnetlink_create_conntrack(struct net *net,
1731 const struct nf_conntrack_zone *zone,
1732 const struct nlattr * const cda[],
1733 struct nf_conntrack_tuple *otuple,
1734 struct nf_conntrack_tuple *rtuple,
1735 u8 u3)
1736 {
1737 struct nf_conn *ct;
1738 int err = -EINVAL;
1739 struct nf_conntrack_helper *helper;
1740 struct nf_conn_tstamp *tstamp;
1741
1742 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1743 if (IS_ERR(ct))
1744 return ERR_PTR(-ENOMEM);
1745
1746 if (!cda[CTA_TIMEOUT])
1747 goto err1;
1748 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1749
1750 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1751
1752 rcu_read_lock();
1753 if (cda[CTA_HELP]) {
1754 char *helpname = NULL;
1755 struct nlattr *helpinfo = NULL;
1756
1757 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1758 if (err < 0)
1759 goto err2;
1760
1761 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1762 nf_ct_protonum(ct));
1763 if (helper == NULL) {
1764 rcu_read_unlock();
1765 #ifdef CONFIG_MODULES
1766 if (request_module("nfct-helper-%s", helpname) < 0) {
1767 err = -EOPNOTSUPP;
1768 goto err1;
1769 }
1770
1771 rcu_read_lock();
1772 helper = __nf_conntrack_helper_find(helpname,
1773 nf_ct_l3num(ct),
1774 nf_ct_protonum(ct));
1775 if (helper) {
1776 err = -EAGAIN;
1777 goto err2;
1778 }
1779 rcu_read_unlock();
1780 #endif
1781 err = -EOPNOTSUPP;
1782 goto err1;
1783 } else {
1784 struct nf_conn_help *help;
1785
1786 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1787 if (help == NULL) {
1788 err = -ENOMEM;
1789 goto err2;
1790 }
1791 /* set private helper data if allowed. */
1792 if (helper->from_nlattr)
1793 helper->from_nlattr(helpinfo, ct);
1794
1795 /* not in hash table yet so not strictly necessary */
1796 RCU_INIT_POINTER(help->helper, helper);
1797 }
1798 } else {
1799 /* try an implicit helper assignation */
1800 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1801 if (err < 0)
1802 goto err2;
1803 }
1804
1805 err = ctnetlink_setup_nat(ct, cda);
1806 if (err < 0)
1807 goto err2;
1808
1809 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1810 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1811 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1812 nf_ct_labels_ext_add(ct);
1813 nfct_seqadj_ext_add(ct);
1814 nfct_synproxy_ext_add(ct);
1815
1816 /* we must add conntrack extensions before confirmation. */
1817 ct->status |= IPS_CONFIRMED;
1818
1819 if (cda[CTA_STATUS]) {
1820 err = ctnetlink_change_status(ct, cda);
1821 if (err < 0)
1822 goto err2;
1823 }
1824
1825 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1826 err = ctnetlink_change_seq_adj(ct, cda);
1827 if (err < 0)
1828 goto err2;
1829 }
1830
1831 memset(&ct->proto, 0, sizeof(ct->proto));
1832 if (cda[CTA_PROTOINFO]) {
1833 err = ctnetlink_change_protoinfo(ct, cda);
1834 if (err < 0)
1835 goto err2;
1836 }
1837
1838 #if defined(CONFIG_NF_CONNTRACK_MARK)
1839 if (cda[CTA_MARK])
1840 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1841 #endif
1842
1843 /* setup master conntrack: this is a confirmed expectation */
1844 if (cda[CTA_TUPLE_MASTER]) {
1845 struct nf_conntrack_tuple master;
1846 struct nf_conntrack_tuple_hash *master_h;
1847 struct nf_conn *master_ct;
1848
1849 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
1850 u3, NULL);
1851 if (err < 0)
1852 goto err2;
1853
1854 master_h = nf_conntrack_find_get(net, zone, &master);
1855 if (master_h == NULL) {
1856 err = -ENOENT;
1857 goto err2;
1858 }
1859 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1860 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1861 ct->master = master_ct;
1862 }
1863 tstamp = nf_conn_tstamp_find(ct);
1864 if (tstamp)
1865 tstamp->start = ktime_get_real_ns();
1866
1867 err = nf_conntrack_hash_check_insert(ct);
1868 if (err < 0)
1869 goto err2;
1870
1871 rcu_read_unlock();
1872
1873 return ct;
1874
1875 err2:
1876 rcu_read_unlock();
1877 err1:
1878 nf_conntrack_free(ct);
1879 return ERR_PTR(err);
1880 }
1881
1882 static int
1883 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1884 const struct nlmsghdr *nlh,
1885 const struct nlattr * const cda[])
1886 {
1887 struct net *net = sock_net(ctnl);
1888 struct nf_conntrack_tuple otuple, rtuple;
1889 struct nf_conntrack_tuple_hash *h = NULL;
1890 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1891 struct nf_conn *ct;
1892 u_int8_t u3 = nfmsg->nfgen_family;
1893 struct nf_conntrack_zone zone;
1894 int err;
1895
1896 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1897 if (err < 0)
1898 return err;
1899
1900 if (cda[CTA_TUPLE_ORIG]) {
1901 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
1902 u3, &zone);
1903 if (err < 0)
1904 return err;
1905 }
1906
1907 if (cda[CTA_TUPLE_REPLY]) {
1908 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
1909 u3, &zone);
1910 if (err < 0)
1911 return err;
1912 }
1913
1914 if (cda[CTA_TUPLE_ORIG])
1915 h = nf_conntrack_find_get(net, &zone, &otuple);
1916 else if (cda[CTA_TUPLE_REPLY])
1917 h = nf_conntrack_find_get(net, &zone, &rtuple);
1918
1919 if (h == NULL) {
1920 err = -ENOENT;
1921 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1922 enum ip_conntrack_events events;
1923
1924 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1925 return -EINVAL;
1926
1927 ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
1928 &rtuple, u3);
1929 if (IS_ERR(ct))
1930 return PTR_ERR(ct);
1931
1932 err = 0;
1933 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1934 events = IPCT_RELATED;
1935 else
1936 events = IPCT_NEW;
1937
1938 if (cda[CTA_LABELS] &&
1939 ctnetlink_attach_labels(ct, cda) == 0)
1940 events |= (1 << IPCT_LABEL);
1941
1942 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1943 (1 << IPCT_ASSURED) |
1944 (1 << IPCT_HELPER) |
1945 (1 << IPCT_PROTOINFO) |
1946 (1 << IPCT_SEQADJ) |
1947 (1 << IPCT_MARK) | events,
1948 ct, NETLINK_CB(skb).portid,
1949 nlmsg_report(nlh));
1950 nf_ct_put(ct);
1951 }
1952
1953 return err;
1954 }
1955 /* implicit 'else' */
1956
1957 err = -EEXIST;
1958 ct = nf_ct_tuplehash_to_ctrack(h);
1959 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1960 spin_lock_bh(&nf_conntrack_expect_lock);
1961 err = ctnetlink_change_conntrack(ct, cda);
1962 spin_unlock_bh(&nf_conntrack_expect_lock);
1963 if (err == 0) {
1964 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1965 (1 << IPCT_ASSURED) |
1966 (1 << IPCT_HELPER) |
1967 (1 << IPCT_LABEL) |
1968 (1 << IPCT_PROTOINFO) |
1969 (1 << IPCT_SEQADJ) |
1970 (1 << IPCT_MARK),
1971 ct, NETLINK_CB(skb).portid,
1972 nlmsg_report(nlh));
1973 }
1974 }
1975
1976 nf_ct_put(ct);
1977 return err;
1978 }
1979
1980 static int
1981 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1982 __u16 cpu, const struct ip_conntrack_stat *st)
1983 {
1984 struct nlmsghdr *nlh;
1985 struct nfgenmsg *nfmsg;
1986 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1987
1988 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1989 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1990 if (nlh == NULL)
1991 goto nlmsg_failure;
1992
1993 nfmsg = nlmsg_data(nlh);
1994 nfmsg->nfgen_family = AF_UNSPEC;
1995 nfmsg->version = NFNETLINK_V0;
1996 nfmsg->res_id = htons(cpu);
1997
1998 if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1999 nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2000 nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
2001 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2002 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
2003 nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
2004 nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
2005 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2006 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2007 htonl(st->insert_failed)) ||
2008 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2009 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2010 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2011 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2012 htonl(st->search_restart)))
2013 goto nla_put_failure;
2014
2015 nlmsg_end(skb, nlh);
2016 return skb->len;
2017
2018 nla_put_failure:
2019 nlmsg_failure:
2020 nlmsg_cancel(skb, nlh);
2021 return -1;
2022 }
2023
2024 static int
2025 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2026 {
2027 int cpu;
2028 struct net *net = sock_net(skb->sk);
2029
2030 if (cb->args[0] == nr_cpu_ids)
2031 return 0;
2032
2033 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2034 const struct ip_conntrack_stat *st;
2035
2036 if (!cpu_possible(cpu))
2037 continue;
2038
2039 st = per_cpu_ptr(net->ct.stat, cpu);
2040 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2041 NETLINK_CB(cb->skb).portid,
2042 cb->nlh->nlmsg_seq,
2043 cpu, st) < 0)
2044 break;
2045 }
2046 cb->args[0] = cpu;
2047
2048 return skb->len;
2049 }
2050
2051 static int
2052 ctnetlink_stat_ct_cpu(struct sock *ctnl, struct sk_buff *skb,
2053 const struct nlmsghdr *nlh,
2054 const struct nlattr * const cda[])
2055 {
2056 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2057 struct netlink_dump_control c = {
2058 .dump = ctnetlink_ct_stat_cpu_dump,
2059 };
2060 return netlink_dump_start(ctnl, skb, nlh, &c);
2061 }
2062
2063 return 0;
2064 }
2065
2066 static int
2067 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2068 struct net *net)
2069 {
2070 struct nlmsghdr *nlh;
2071 struct nfgenmsg *nfmsg;
2072 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2073 unsigned int nr_conntracks = atomic_read(&net->ct.count);
2074
2075 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
2076 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2077 if (nlh == NULL)
2078 goto nlmsg_failure;
2079
2080 nfmsg = nlmsg_data(nlh);
2081 nfmsg->nfgen_family = AF_UNSPEC;
2082 nfmsg->version = NFNETLINK_V0;
2083 nfmsg->res_id = 0;
2084
2085 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2086 goto nla_put_failure;
2087
2088 nlmsg_end(skb, nlh);
2089 return skb->len;
2090
2091 nla_put_failure:
2092 nlmsg_failure:
2093 nlmsg_cancel(skb, nlh);
2094 return -1;
2095 }
2096
2097 static int
2098 ctnetlink_stat_ct(struct sock *ctnl, struct sk_buff *skb,
2099 const struct nlmsghdr *nlh,
2100 const struct nlattr * const cda[])
2101 {
2102 struct sk_buff *skb2;
2103 int err;
2104
2105 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2106 if (skb2 == NULL)
2107 return -ENOMEM;
2108
2109 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2110 nlh->nlmsg_seq,
2111 NFNL_MSG_TYPE(nlh->nlmsg_type),
2112 sock_net(skb->sk));
2113 if (err <= 0)
2114 goto free;
2115
2116 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2117 if (err < 0)
2118 goto out;
2119
2120 return 0;
2121
2122 free:
2123 kfree_skb(skb2);
2124 out:
2125 /* this avoids a loop in nfnetlink. */
2126 return err == -EAGAIN ? -ENOBUFS : err;
2127 }
2128
2129 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2130 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2131 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2132 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2133 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2134 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2135 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2136 .len = NF_CT_HELPER_NAME_LEN - 1 },
2137 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2138 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2139 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2140 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2141 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2142 };
2143
2144 static struct nf_conntrack_expect *
2145 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2146 struct nf_conntrack_helper *helper,
2147 struct nf_conntrack_tuple *tuple,
2148 struct nf_conntrack_tuple *mask);
2149
2150 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2151 static size_t
2152 ctnetlink_glue_build_size(const struct nf_conn *ct)
2153 {
2154 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2155 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2156 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2157 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2158 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2159 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2160 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2161 + nla_total_size(0) /* CTA_PROTOINFO */
2162 + nla_total_size(0) /* CTA_HELP */
2163 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2164 + ctnetlink_secctx_size(ct)
2165 #ifdef CONFIG_NF_NAT_NEEDED
2166 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2167 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2168 #endif
2169 #ifdef CONFIG_NF_CONNTRACK_MARK
2170 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2171 #endif
2172 #ifdef CONFIG_NF_CONNTRACK_ZONES
2173 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2174 #endif
2175 + ctnetlink_proto_size(ct)
2176 ;
2177 }
2178
2179 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2180 enum ip_conntrack_info *ctinfo)
2181 {
2182 struct nf_conn *ct;
2183
2184 ct = nf_ct_get(skb, ctinfo);
2185 if (ct && nf_ct_is_untracked(ct))
2186 ct = NULL;
2187
2188 return ct;
2189 }
2190
2191 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2192 {
2193 const struct nf_conntrack_zone *zone;
2194 struct nlattr *nest_parms;
2195
2196 rcu_read_lock();
2197 zone = nf_ct_zone(ct);
2198
2199 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2200 if (!nest_parms)
2201 goto nla_put_failure;
2202 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2203 goto nla_put_failure;
2204 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2205 NF_CT_ZONE_DIR_ORIG) < 0)
2206 goto nla_put_failure;
2207 nla_nest_end(skb, nest_parms);
2208
2209 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2210 if (!nest_parms)
2211 goto nla_put_failure;
2212 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2213 goto nla_put_failure;
2214 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2215 NF_CT_ZONE_DIR_REPL) < 0)
2216 goto nla_put_failure;
2217 nla_nest_end(skb, nest_parms);
2218
2219 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2220 NF_CT_DEFAULT_ZONE_DIR) < 0)
2221 goto nla_put_failure;
2222
2223 if (ctnetlink_dump_id(skb, ct) < 0)
2224 goto nla_put_failure;
2225
2226 if (ctnetlink_dump_status(skb, ct) < 0)
2227 goto nla_put_failure;
2228
2229 if (ctnetlink_dump_timeout(skb, ct) < 0)
2230 goto nla_put_failure;
2231
2232 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2233 goto nla_put_failure;
2234
2235 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2236 goto nla_put_failure;
2237
2238 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2239 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2240 goto nla_put_failure;
2241 #endif
2242 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2243 goto nla_put_failure;
2244
2245 if ((ct->status & IPS_SEQ_ADJUST) &&
2246 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2247 goto nla_put_failure;
2248
2249 #ifdef CONFIG_NF_CONNTRACK_MARK
2250 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2251 goto nla_put_failure;
2252 #endif
2253 if (ctnetlink_dump_labels(skb, ct) < 0)
2254 goto nla_put_failure;
2255 rcu_read_unlock();
2256 return 0;
2257
2258 nla_put_failure:
2259 rcu_read_unlock();
2260 return -ENOSPC;
2261 }
2262
2263 static int
2264 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2265 enum ip_conntrack_info ctinfo,
2266 u_int16_t ct_attr, u_int16_t ct_info_attr)
2267 {
2268 struct nlattr *nest_parms;
2269
2270 nest_parms = nla_nest_start(skb, ct_attr | NLA_F_NESTED);
2271 if (!nest_parms)
2272 goto nla_put_failure;
2273
2274 if (__ctnetlink_glue_build(skb, ct) < 0)
2275 goto nla_put_failure;
2276
2277 nla_nest_end(skb, nest_parms);
2278
2279 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2280 goto nla_put_failure;
2281
2282 return 0;
2283
2284 nla_put_failure:
2285 return -ENOSPC;
2286 }
2287
2288 static int
2289 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2290 {
2291 int err;
2292
2293 if (cda[CTA_TIMEOUT]) {
2294 err = ctnetlink_change_timeout(ct, cda);
2295 if (err < 0)
2296 return err;
2297 }
2298 if (cda[CTA_STATUS]) {
2299 err = ctnetlink_change_status(ct, cda);
2300 if (err < 0)
2301 return err;
2302 }
2303 if (cda[CTA_HELP]) {
2304 err = ctnetlink_change_helper(ct, cda);
2305 if (err < 0)
2306 return err;
2307 }
2308 if (cda[CTA_LABELS]) {
2309 err = ctnetlink_attach_labels(ct, cda);
2310 if (err < 0)
2311 return err;
2312 }
2313 #if defined(CONFIG_NF_CONNTRACK_MARK)
2314 if (cda[CTA_MARK]) {
2315 u32 mask = 0, mark, newmark;
2316 if (cda[CTA_MARK_MASK])
2317 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2318
2319 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2320 newmark = (ct->mark & mask) ^ mark;
2321 if (newmark != ct->mark)
2322 ct->mark = newmark;
2323 }
2324 #endif
2325 return 0;
2326 }
2327
2328 static int
2329 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2330 {
2331 struct nlattr *cda[CTA_MAX+1];
2332 int ret;
2333
2334 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2335 if (ret < 0)
2336 return ret;
2337
2338 spin_lock_bh(&nf_conntrack_expect_lock);
2339 ret = ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2340 spin_unlock_bh(&nf_conntrack_expect_lock);
2341
2342 return ret;
2343 }
2344
2345 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2346 const struct nf_conn *ct,
2347 struct nf_conntrack_tuple *tuple,
2348 struct nf_conntrack_tuple *mask)
2349 {
2350 int err;
2351
2352 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2353 nf_ct_l3num(ct), NULL);
2354 if (err < 0)
2355 return err;
2356
2357 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2358 nf_ct_l3num(ct), NULL);
2359 }
2360
2361 static int
2362 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2363 u32 portid, u32 report)
2364 {
2365 struct nlattr *cda[CTA_EXPECT_MAX+1];
2366 struct nf_conntrack_tuple tuple, mask;
2367 struct nf_conntrack_helper *helper = NULL;
2368 struct nf_conntrack_expect *exp;
2369 int err;
2370
2371 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2372 if (err < 0)
2373 return err;
2374
2375 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2376 ct, &tuple, &mask);
2377 if (err < 0)
2378 return err;
2379
2380 if (cda[CTA_EXPECT_HELP_NAME]) {
2381 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2382
2383 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2384 nf_ct_protonum(ct));
2385 if (helper == NULL)
2386 return -EOPNOTSUPP;
2387 }
2388
2389 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2390 helper, &tuple, &mask);
2391 if (IS_ERR(exp))
2392 return PTR_ERR(exp);
2393
2394 err = nf_ct_expect_related_report(exp, portid, report);
2395 if (err < 0) {
2396 nf_ct_expect_put(exp);
2397 return err;
2398 }
2399
2400 return 0;
2401 }
2402
2403 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2404 enum ip_conntrack_info ctinfo, int diff)
2405 {
2406 if (!(ct->status & IPS_NAT_MASK))
2407 return;
2408
2409 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2410 }
2411
2412 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2413 .get_ct = ctnetlink_glue_get_ct,
2414 .build_size = ctnetlink_glue_build_size,
2415 .build = ctnetlink_glue_build,
2416 .parse = ctnetlink_glue_parse,
2417 .attach_expect = ctnetlink_glue_attach_expect,
2418 .seq_adjust = ctnetlink_glue_seqadj,
2419 };
2420 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2421
2422 /***********************************************************************
2423 * EXPECT
2424 ***********************************************************************/
2425
2426 static inline int
2427 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2428 const struct nf_conntrack_tuple *tuple,
2429 u32 type)
2430 {
2431 struct nlattr *nest_parms;
2432
2433 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2434 if (!nest_parms)
2435 goto nla_put_failure;
2436 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2437 goto nla_put_failure;
2438 nla_nest_end(skb, nest_parms);
2439
2440 return 0;
2441
2442 nla_put_failure:
2443 return -1;
2444 }
2445
2446 static inline int
2447 ctnetlink_exp_dump_mask(struct sk_buff *skb,
2448 const struct nf_conntrack_tuple *tuple,
2449 const struct nf_conntrack_tuple_mask *mask)
2450 {
2451 int ret;
2452 struct nf_conntrack_l3proto *l3proto;
2453 struct nf_conntrack_l4proto *l4proto;
2454 struct nf_conntrack_tuple m;
2455 struct nlattr *nest_parms;
2456
2457 memset(&m, 0xFF, sizeof(m));
2458 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2459 m.src.u.all = mask->src.u.all;
2460 m.dst.protonum = tuple->dst.protonum;
2461
2462 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2463 if (!nest_parms)
2464 goto nla_put_failure;
2465
2466 rcu_read_lock();
2467 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2468 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2469 if (ret >= 0) {
2470 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2471 tuple->dst.protonum);
2472 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2473 }
2474 rcu_read_unlock();
2475
2476 if (unlikely(ret < 0))
2477 goto nla_put_failure;
2478
2479 nla_nest_end(skb, nest_parms);
2480
2481 return 0;
2482
2483 nla_put_failure:
2484 return -1;
2485 }
2486
2487 static const union nf_inet_addr any_addr;
2488
2489 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2490 {
2491 static __read_mostly siphash_key_t exp_id_seed;
2492 unsigned long a, b, c, d;
2493
2494 net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
2495
2496 a = (unsigned long)exp;
2497 b = (unsigned long)exp->helper;
2498 c = (unsigned long)exp->master;
2499 d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
2500
2501 #ifdef CONFIG_64BIT
2502 return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
2503 #else
2504 return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
2505 #endif
2506 }
2507
2508 static int
2509 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2510 const struct nf_conntrack_expect *exp)
2511 {
2512 struct nf_conn *master = exp->master;
2513 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2514 struct nf_conn_help *help;
2515 #ifdef CONFIG_NF_NAT_NEEDED
2516 struct nlattr *nest_parms;
2517 struct nf_conntrack_tuple nat_tuple = {};
2518 #endif
2519 struct nf_ct_helper_expectfn *expfn;
2520
2521 if (timeout < 0)
2522 timeout = 0;
2523
2524 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2525 goto nla_put_failure;
2526 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2527 goto nla_put_failure;
2528 if (ctnetlink_exp_dump_tuple(skb,
2529 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2530 CTA_EXPECT_MASTER) < 0)
2531 goto nla_put_failure;
2532
2533 #ifdef CONFIG_NF_NAT_NEEDED
2534 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2535 exp->saved_proto.all) {
2536 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2537 if (!nest_parms)
2538 goto nla_put_failure;
2539
2540 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2541 goto nla_put_failure;
2542
2543 nat_tuple.src.l3num = nf_ct_l3num(master);
2544 nat_tuple.src.u3 = exp->saved_addr;
2545 nat_tuple.dst.protonum = nf_ct_protonum(master);
2546 nat_tuple.src.u = exp->saved_proto;
2547
2548 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2549 CTA_EXPECT_NAT_TUPLE) < 0)
2550 goto nla_put_failure;
2551 nla_nest_end(skb, nest_parms);
2552 }
2553 #endif
2554 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2555 nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
2556 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2557 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2558 goto nla_put_failure;
2559 help = nfct_help(master);
2560 if (help) {
2561 struct nf_conntrack_helper *helper;
2562
2563 helper = rcu_dereference(help->helper);
2564 if (helper &&
2565 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2566 goto nla_put_failure;
2567 }
2568 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2569 if (expfn != NULL &&
2570 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2571 goto nla_put_failure;
2572
2573 return 0;
2574
2575 nla_put_failure:
2576 return -1;
2577 }
2578
2579 static int
2580 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2581 int event, const struct nf_conntrack_expect *exp)
2582 {
2583 struct nlmsghdr *nlh;
2584 struct nfgenmsg *nfmsg;
2585 unsigned int flags = portid ? NLM_F_MULTI : 0;
2586
2587 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2588 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2589 if (nlh == NULL)
2590 goto nlmsg_failure;
2591
2592 nfmsg = nlmsg_data(nlh);
2593 nfmsg->nfgen_family = exp->tuple.src.l3num;
2594 nfmsg->version = NFNETLINK_V0;
2595 nfmsg->res_id = 0;
2596
2597 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2598 goto nla_put_failure;
2599
2600 nlmsg_end(skb, nlh);
2601 return skb->len;
2602
2603 nlmsg_failure:
2604 nla_put_failure:
2605 nlmsg_cancel(skb, nlh);
2606 return -1;
2607 }
2608
2609 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2610 static int
2611 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2612 {
2613 struct nf_conntrack_expect *exp = item->exp;
2614 struct net *net = nf_ct_exp_net(exp);
2615 struct nlmsghdr *nlh;
2616 struct nfgenmsg *nfmsg;
2617 struct sk_buff *skb;
2618 unsigned int type, group;
2619 int flags = 0;
2620
2621 if (events & (1 << IPEXP_DESTROY)) {
2622 type = IPCTNL_MSG_EXP_DELETE;
2623 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2624 } else if (events & (1 << IPEXP_NEW)) {
2625 type = IPCTNL_MSG_EXP_NEW;
2626 flags = NLM_F_CREATE|NLM_F_EXCL;
2627 group = NFNLGRP_CONNTRACK_EXP_NEW;
2628 } else
2629 return 0;
2630
2631 if (!item->report && !nfnetlink_has_listeners(net, group))
2632 return 0;
2633
2634 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2635 if (skb == NULL)
2636 goto errout;
2637
2638 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2639 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2640 if (nlh == NULL)
2641 goto nlmsg_failure;
2642
2643 nfmsg = nlmsg_data(nlh);
2644 nfmsg->nfgen_family = exp->tuple.src.l3num;
2645 nfmsg->version = NFNETLINK_V0;
2646 nfmsg->res_id = 0;
2647
2648 rcu_read_lock();
2649 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2650 goto nla_put_failure;
2651 rcu_read_unlock();
2652
2653 nlmsg_end(skb, nlh);
2654 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2655 return 0;
2656
2657 nla_put_failure:
2658 rcu_read_unlock();
2659 nlmsg_cancel(skb, nlh);
2660 nlmsg_failure:
2661 kfree_skb(skb);
2662 errout:
2663 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2664 return 0;
2665 }
2666 #endif
2667 static int ctnetlink_exp_done(struct netlink_callback *cb)
2668 {
2669 if (cb->args[1])
2670 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2671 return 0;
2672 }
2673
2674 static int
2675 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2676 {
2677 struct net *net = sock_net(skb->sk);
2678 struct nf_conntrack_expect *exp, *last;
2679 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2680 u_int8_t l3proto = nfmsg->nfgen_family;
2681
2682 rcu_read_lock();
2683 last = (struct nf_conntrack_expect *)cb->args[1];
2684 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2685 restart:
2686 hlist_for_each_entry(exp, &net->ct.expect_hash[cb->args[0]],
2687 hnode) {
2688 if (l3proto && exp->tuple.src.l3num != l3proto)
2689 continue;
2690 if (cb->args[1]) {
2691 if (exp != last)
2692 continue;
2693 cb->args[1] = 0;
2694 }
2695 if (ctnetlink_exp_fill_info(skb,
2696 NETLINK_CB(cb->skb).portid,
2697 cb->nlh->nlmsg_seq,
2698 IPCTNL_MSG_EXP_NEW,
2699 exp) < 0) {
2700 if (!atomic_inc_not_zero(&exp->use))
2701 continue;
2702 cb->args[1] = (unsigned long)exp;
2703 goto out;
2704 }
2705 }
2706 if (cb->args[1]) {
2707 cb->args[1] = 0;
2708 goto restart;
2709 }
2710 }
2711 out:
2712 rcu_read_unlock();
2713 if (last)
2714 nf_ct_expect_put(last);
2715
2716 return skb->len;
2717 }
2718
2719 static int
2720 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2721 {
2722 struct nf_conntrack_expect *exp, *last;
2723 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2724 struct nf_conn *ct = cb->data;
2725 struct nf_conn_help *help = nfct_help(ct);
2726 u_int8_t l3proto = nfmsg->nfgen_family;
2727
2728 if (cb->args[0])
2729 return 0;
2730
2731 rcu_read_lock();
2732 last = (struct nf_conntrack_expect *)cb->args[1];
2733 restart:
2734 hlist_for_each_entry(exp, &help->expectations, lnode) {
2735 if (l3proto && exp->tuple.src.l3num != l3proto)
2736 continue;
2737 if (cb->args[1]) {
2738 if (exp != last)
2739 continue;
2740 cb->args[1] = 0;
2741 }
2742 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2743 cb->nlh->nlmsg_seq,
2744 IPCTNL_MSG_EXP_NEW,
2745 exp) < 0) {
2746 if (!atomic_inc_not_zero(&exp->use))
2747 continue;
2748 cb->args[1] = (unsigned long)exp;
2749 goto out;
2750 }
2751 }
2752 if (cb->args[1]) {
2753 cb->args[1] = 0;
2754 goto restart;
2755 }
2756 cb->args[0] = 1;
2757 out:
2758 rcu_read_unlock();
2759 if (last)
2760 nf_ct_expect_put(last);
2761
2762 return skb->len;
2763 }
2764
2765 static int ctnetlink_dump_exp_ct(struct sock *ctnl, struct sk_buff *skb,
2766 const struct nlmsghdr *nlh,
2767 const struct nlattr * const cda[])
2768 {
2769 int err;
2770 struct net *net = sock_net(ctnl);
2771 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2772 u_int8_t u3 = nfmsg->nfgen_family;
2773 struct nf_conntrack_tuple tuple;
2774 struct nf_conntrack_tuple_hash *h;
2775 struct nf_conn *ct;
2776 struct nf_conntrack_zone zone;
2777 struct netlink_dump_control c = {
2778 .dump = ctnetlink_exp_ct_dump_table,
2779 .done = ctnetlink_exp_done,
2780 };
2781
2782 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2783 u3, NULL);
2784 if (err < 0)
2785 return err;
2786
2787 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2788 if (err < 0)
2789 return err;
2790
2791 h = nf_conntrack_find_get(net, &zone, &tuple);
2792 if (!h)
2793 return -ENOENT;
2794
2795 ct = nf_ct_tuplehash_to_ctrack(h);
2796 c.data = ct;
2797
2798 err = netlink_dump_start(ctnl, skb, nlh, &c);
2799 nf_ct_put(ct);
2800
2801 return err;
2802 }
2803
2804 static int
2805 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
2806 const struct nlmsghdr *nlh,
2807 const struct nlattr * const cda[])
2808 {
2809 struct net *net = sock_net(ctnl);
2810 struct nf_conntrack_tuple tuple;
2811 struct nf_conntrack_expect *exp;
2812 struct sk_buff *skb2;
2813 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2814 u_int8_t u3 = nfmsg->nfgen_family;
2815 struct nf_conntrack_zone zone;
2816 int err;
2817
2818 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2819 if (cda[CTA_EXPECT_MASTER])
2820 return ctnetlink_dump_exp_ct(ctnl, skb, nlh, cda);
2821 else {
2822 struct netlink_dump_control c = {
2823 .dump = ctnetlink_exp_dump_table,
2824 .done = ctnetlink_exp_done,
2825 };
2826 return netlink_dump_start(ctnl, skb, nlh, &c);
2827 }
2828 }
2829
2830 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2831 if (err < 0)
2832 return err;
2833
2834 if (cda[CTA_EXPECT_TUPLE])
2835 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2836 u3, NULL);
2837 else if (cda[CTA_EXPECT_MASTER])
2838 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2839 u3, NULL);
2840 else
2841 return -EINVAL;
2842
2843 if (err < 0)
2844 return err;
2845
2846 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2847 if (!exp)
2848 return -ENOENT;
2849
2850 if (cda[CTA_EXPECT_ID]) {
2851 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2852
2853 if (id != nf_expect_get_id(exp)) {
2854 nf_ct_expect_put(exp);
2855 return -ENOENT;
2856 }
2857 }
2858
2859 err = -ENOMEM;
2860 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2861 if (skb2 == NULL) {
2862 nf_ct_expect_put(exp);
2863 goto out;
2864 }
2865
2866 rcu_read_lock();
2867 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2868 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2869 rcu_read_unlock();
2870 nf_ct_expect_put(exp);
2871 if (err <= 0)
2872 goto free;
2873
2874 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2875 if (err < 0)
2876 goto out;
2877
2878 return 0;
2879
2880 free:
2881 kfree_skb(skb2);
2882 out:
2883 /* this avoids a loop in nfnetlink. */
2884 return err == -EAGAIN ? -ENOBUFS : err;
2885 }
2886
2887 static int
2888 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
2889 const struct nlmsghdr *nlh,
2890 const struct nlattr * const cda[])
2891 {
2892 struct net *net = sock_net(ctnl);
2893 struct nf_conntrack_expect *exp;
2894 struct nf_conntrack_tuple tuple;
2895 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2896 struct hlist_node *next;
2897 u_int8_t u3 = nfmsg->nfgen_family;
2898 struct nf_conntrack_zone zone;
2899 unsigned int i;
2900 int err;
2901
2902 if (cda[CTA_EXPECT_TUPLE]) {
2903 /* delete a single expect by tuple */
2904 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2905 if (err < 0)
2906 return err;
2907
2908 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2909 u3, NULL);
2910 if (err < 0)
2911 return err;
2912
2913 /* bump usage count to 2 */
2914 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2915 if (!exp)
2916 return -ENOENT;
2917
2918 if (cda[CTA_EXPECT_ID]) {
2919 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2920 if (ntohl(id) != (u32)(unsigned long)exp) {
2921 nf_ct_expect_put(exp);
2922 return -ENOENT;
2923 }
2924 }
2925
2926 /* after list removal, usage count == 1 */
2927 spin_lock_bh(&nf_conntrack_expect_lock);
2928 if (del_timer(&exp->timeout)) {
2929 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2930 nlmsg_report(nlh));
2931 nf_ct_expect_put(exp);
2932 }
2933 spin_unlock_bh(&nf_conntrack_expect_lock);
2934 /* have to put what we 'get' above.
2935 * after this line usage count == 0 */
2936 nf_ct_expect_put(exp);
2937 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2938 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2939 struct nf_conn_help *m_help;
2940
2941 /* delete all expectations for this helper */
2942 spin_lock_bh(&nf_conntrack_expect_lock);
2943 for (i = 0; i < nf_ct_expect_hsize; i++) {
2944 hlist_for_each_entry_safe(exp, next,
2945 &net->ct.expect_hash[i],
2946 hnode) {
2947 m_help = nfct_help(exp->master);
2948 if (!strcmp(m_help->helper->name, name) &&
2949 del_timer(&exp->timeout)) {
2950 nf_ct_unlink_expect_report(exp,
2951 NETLINK_CB(skb).portid,
2952 nlmsg_report(nlh));
2953 nf_ct_expect_put(exp);
2954 }
2955 }
2956 }
2957 spin_unlock_bh(&nf_conntrack_expect_lock);
2958 } else {
2959 /* This basically means we have to flush everything*/
2960 spin_lock_bh(&nf_conntrack_expect_lock);
2961 for (i = 0; i < nf_ct_expect_hsize; i++) {
2962 hlist_for_each_entry_safe(exp, next,
2963 &net->ct.expect_hash[i],
2964 hnode) {
2965 if (del_timer(&exp->timeout)) {
2966 nf_ct_unlink_expect_report(exp,
2967 NETLINK_CB(skb).portid,
2968 nlmsg_report(nlh));
2969 nf_ct_expect_put(exp);
2970 }
2971 }
2972 }
2973 spin_unlock_bh(&nf_conntrack_expect_lock);
2974 }
2975
2976 return 0;
2977 }
2978 static int
2979 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2980 const struct nlattr * const cda[])
2981 {
2982 if (cda[CTA_EXPECT_TIMEOUT]) {
2983 if (!del_timer(&x->timeout))
2984 return -ETIME;
2985
2986 x->timeout.expires = jiffies +
2987 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2988 add_timer(&x->timeout);
2989 }
2990 return 0;
2991 }
2992
2993 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2994 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2995 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2996 };
2997
2998 static int
2999 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3000 struct nf_conntrack_expect *exp,
3001 u_int8_t u3)
3002 {
3003 #ifdef CONFIG_NF_NAT_NEEDED
3004 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3005 struct nf_conntrack_tuple nat_tuple = {};
3006 int err;
3007
3008 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
3009 if (err < 0)
3010 return err;
3011
3012 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3013 return -EINVAL;
3014
3015 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3016 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3017 u3, NULL);
3018 if (err < 0)
3019 return err;
3020
3021 exp->saved_addr = nat_tuple.src.u3;
3022 exp->saved_proto = nat_tuple.src.u;
3023 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3024
3025 return 0;
3026 #else
3027 return -EOPNOTSUPP;
3028 #endif
3029 }
3030
3031 static struct nf_conntrack_expect *
3032 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3033 struct nf_conntrack_helper *helper,
3034 struct nf_conntrack_tuple *tuple,
3035 struct nf_conntrack_tuple *mask)
3036 {
3037 u_int32_t class = 0;
3038 struct nf_conntrack_expect *exp;
3039 struct nf_conn_help *help;
3040 int err;
3041
3042 if (cda[CTA_EXPECT_CLASS] && helper) {
3043 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3044 if (class > helper->expect_class_max)
3045 return ERR_PTR(-EINVAL);
3046 }
3047 exp = nf_ct_expect_alloc(ct);
3048 if (!exp)
3049 return ERR_PTR(-ENOMEM);
3050
3051 help = nfct_help(ct);
3052 if (!help) {
3053 if (!cda[CTA_EXPECT_TIMEOUT]) {
3054 err = -EINVAL;
3055 goto err_out;
3056 }
3057 exp->timeout.expires =
3058 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3059
3060 exp->flags = NF_CT_EXPECT_USERSPACE;
3061 if (cda[CTA_EXPECT_FLAGS]) {
3062 exp->flags |=
3063 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3064 }
3065 } else {
3066 if (cda[CTA_EXPECT_FLAGS]) {
3067 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3068 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3069 } else
3070 exp->flags = 0;
3071 }
3072 if (cda[CTA_EXPECT_FN]) {
3073 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3074 struct nf_ct_helper_expectfn *expfn;
3075
3076 expfn = nf_ct_helper_expectfn_find_by_name(name);
3077 if (expfn == NULL) {
3078 err = -EINVAL;
3079 goto err_out;
3080 }
3081 exp->expectfn = expfn->expectfn;
3082 } else
3083 exp->expectfn = NULL;
3084
3085 exp->class = class;
3086 exp->master = ct;
3087 exp->helper = helper;
3088 exp->tuple = *tuple;
3089 exp->mask.src.u3 = mask->src.u3;
3090 exp->mask.src.u.all = mask->src.u.all;
3091
3092 if (cda[CTA_EXPECT_NAT]) {
3093 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3094 exp, nf_ct_l3num(ct));
3095 if (err < 0)
3096 goto err_out;
3097 }
3098 return exp;
3099 err_out:
3100 nf_ct_expect_put(exp);
3101 return ERR_PTR(err);
3102 }
3103
3104 static int
3105 ctnetlink_create_expect(struct net *net,
3106 const struct nf_conntrack_zone *zone,
3107 const struct nlattr * const cda[],
3108 u_int8_t u3, u32 portid, int report)
3109 {
3110 struct nf_conntrack_tuple tuple, mask, master_tuple;
3111 struct nf_conntrack_tuple_hash *h = NULL;
3112 struct nf_conntrack_helper *helper = NULL;
3113 struct nf_conntrack_expect *exp;
3114 struct nf_conn *ct;
3115 int err;
3116
3117 /* caller guarantees that those three CTA_EXPECT_* exist */
3118 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3119 u3, NULL);
3120 if (err < 0)
3121 return err;
3122 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3123 u3, NULL);
3124 if (err < 0)
3125 return err;
3126 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3127 u3, NULL);
3128 if (err < 0)
3129 return err;
3130
3131 /* Look for master conntrack of this expectation */
3132 h = nf_conntrack_find_get(net, zone, &master_tuple);
3133 if (!h)
3134 return -ENOENT;
3135 ct = nf_ct_tuplehash_to_ctrack(h);
3136
3137 if (cda[CTA_EXPECT_HELP_NAME]) {
3138 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3139
3140 helper = __nf_conntrack_helper_find(helpname, u3,
3141 nf_ct_protonum(ct));
3142 if (helper == NULL) {
3143 #ifdef CONFIG_MODULES
3144 if (request_module("nfct-helper-%s", helpname) < 0) {
3145 err = -EOPNOTSUPP;
3146 goto err_ct;
3147 }
3148 helper = __nf_conntrack_helper_find(helpname, u3,
3149 nf_ct_protonum(ct));
3150 if (helper) {
3151 err = -EAGAIN;
3152 goto err_ct;
3153 }
3154 #endif
3155 err = -EOPNOTSUPP;
3156 goto err_ct;
3157 }
3158 }
3159
3160 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3161 if (IS_ERR(exp)) {
3162 err = PTR_ERR(exp);
3163 goto err_ct;
3164 }
3165
3166 err = nf_ct_expect_related_report(exp, portid, report);
3167 nf_ct_expect_put(exp);
3168 err_ct:
3169 nf_ct_put(ct);
3170 return err;
3171 }
3172
3173 static int
3174 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
3175 const struct nlmsghdr *nlh,
3176 const struct nlattr * const cda[])
3177 {
3178 struct net *net = sock_net(ctnl);
3179 struct nf_conntrack_tuple tuple;
3180 struct nf_conntrack_expect *exp;
3181 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3182 u_int8_t u3 = nfmsg->nfgen_family;
3183 struct nf_conntrack_zone zone;
3184 int err;
3185
3186 if (!cda[CTA_EXPECT_TUPLE]
3187 || !cda[CTA_EXPECT_MASK]
3188 || !cda[CTA_EXPECT_MASTER])
3189 return -EINVAL;
3190
3191 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3192 if (err < 0)
3193 return err;
3194
3195 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3196 u3, NULL);
3197 if (err < 0)
3198 return err;
3199
3200 spin_lock_bh(&nf_conntrack_expect_lock);
3201 exp = __nf_ct_expect_find(net, &zone, &tuple);
3202 if (!exp) {
3203 spin_unlock_bh(&nf_conntrack_expect_lock);
3204 err = -ENOENT;
3205 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3206 err = ctnetlink_create_expect(net, &zone, cda, u3,
3207 NETLINK_CB(skb).portid,
3208 nlmsg_report(nlh));
3209 }
3210 return err;
3211 }
3212
3213 err = -EEXIST;
3214 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3215 err = ctnetlink_change_expect(exp, cda);
3216 spin_unlock_bh(&nf_conntrack_expect_lock);
3217
3218 return err;
3219 }
3220
3221 static int
3222 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3223 const struct ip_conntrack_stat *st)
3224 {
3225 struct nlmsghdr *nlh;
3226 struct nfgenmsg *nfmsg;
3227 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3228
3229 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
3230 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3231 if (nlh == NULL)
3232 goto nlmsg_failure;
3233
3234 nfmsg = nlmsg_data(nlh);
3235 nfmsg->nfgen_family = AF_UNSPEC;
3236 nfmsg->version = NFNETLINK_V0;
3237 nfmsg->res_id = htons(cpu);
3238
3239 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3240 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3241 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3242 goto nla_put_failure;
3243
3244 nlmsg_end(skb, nlh);
3245 return skb->len;
3246
3247 nla_put_failure:
3248 nlmsg_failure:
3249 nlmsg_cancel(skb, nlh);
3250 return -1;
3251 }
3252
3253 static int
3254 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3255 {
3256 int cpu;
3257 struct net *net = sock_net(skb->sk);
3258
3259 if (cb->args[0] == nr_cpu_ids)
3260 return 0;
3261
3262 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3263 const struct ip_conntrack_stat *st;
3264
3265 if (!cpu_possible(cpu))
3266 continue;
3267
3268 st = per_cpu_ptr(net->ct.stat, cpu);
3269 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3270 cb->nlh->nlmsg_seq,
3271 cpu, st) < 0)
3272 break;
3273 }
3274 cb->args[0] = cpu;
3275
3276 return skb->len;
3277 }
3278
3279 static int
3280 ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
3281 const struct nlmsghdr *nlh,
3282 const struct nlattr * const cda[])
3283 {
3284 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3285 struct netlink_dump_control c = {
3286 .dump = ctnetlink_exp_stat_cpu_dump,
3287 };
3288 return netlink_dump_start(ctnl, skb, nlh, &c);
3289 }
3290
3291 return 0;
3292 }
3293
3294 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3295 static struct nf_ct_event_notifier ctnl_notifier = {
3296 .fcn = ctnetlink_conntrack_event,
3297 };
3298
3299 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3300 .fcn = ctnetlink_expect_event,
3301 };
3302 #endif
3303
3304 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3305 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3306 .attr_count = CTA_MAX,
3307 .policy = ct_nla_policy },
3308 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3309 .attr_count = CTA_MAX,
3310 .policy = ct_nla_policy },
3311 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3312 .attr_count = CTA_MAX,
3313 .policy = ct_nla_policy },
3314 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3315 .attr_count = CTA_MAX,
3316 .policy = ct_nla_policy },
3317 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3318 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3319 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3320 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3321 };
3322
3323 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3324 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3325 .attr_count = CTA_EXPECT_MAX,
3326 .policy = exp_nla_policy },
3327 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3328 .attr_count = CTA_EXPECT_MAX,
3329 .policy = exp_nla_policy },
3330 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3331 .attr_count = CTA_EXPECT_MAX,
3332 .policy = exp_nla_policy },
3333 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3334 };
3335
3336 static const struct nfnetlink_subsystem ctnl_subsys = {
3337 .name = "conntrack",
3338 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3339 .cb_count = IPCTNL_MSG_MAX,
3340 .cb = ctnl_cb,
3341 };
3342
3343 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3344 .name = "conntrack_expect",
3345 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3346 .cb_count = IPCTNL_MSG_EXP_MAX,
3347 .cb = ctnl_exp_cb,
3348 };
3349
3350 MODULE_ALIAS("ip_conntrack_netlink");
3351 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3352 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3353
3354 static int __net_init ctnetlink_net_init(struct net *net)
3355 {
3356 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3357 int ret;
3358
3359 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3360 if (ret < 0) {
3361 pr_err("ctnetlink_init: cannot register notifier.\n");
3362 goto err_out;
3363 }
3364
3365 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3366 if (ret < 0) {
3367 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3368 goto err_unreg_notifier;
3369 }
3370 #endif
3371 return 0;
3372
3373 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3374 err_unreg_notifier:
3375 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3376 err_out:
3377 return ret;
3378 #endif
3379 }
3380
3381 static void ctnetlink_net_exit(struct net *net)
3382 {
3383 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3384 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3385 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3386 #endif
3387 }
3388
3389 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3390 {
3391 struct net *net;
3392
3393 list_for_each_entry(net, net_exit_list, exit_list)
3394 ctnetlink_net_exit(net);
3395
3396 /* wait for other cpus until they are done with ctnl_notifiers */
3397 synchronize_rcu();
3398 }
3399
3400 static struct pernet_operations ctnetlink_net_ops = {
3401 .init = ctnetlink_net_init,
3402 .exit_batch = ctnetlink_net_exit_batch,
3403 };
3404
3405 static int __init ctnetlink_init(void)
3406 {
3407 int ret;
3408
3409 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3410 ret = nfnetlink_subsys_register(&ctnl_subsys);
3411 if (ret < 0) {
3412 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3413 goto err_out;
3414 }
3415
3416 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3417 if (ret < 0) {
3418 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3419 goto err_unreg_subsys;
3420 }
3421
3422 ret = register_pernet_subsys(&ctnetlink_net_ops);
3423 if (ret < 0) {
3424 pr_err("ctnetlink_init: cannot register pernet operations\n");
3425 goto err_unreg_exp_subsys;
3426 }
3427 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3428 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3429 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3430 #endif
3431 return 0;
3432
3433 err_unreg_exp_subsys:
3434 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3435 err_unreg_subsys:
3436 nfnetlink_subsys_unregister(&ctnl_subsys);
3437 err_out:
3438 return ret;
3439 }
3440
3441 static void __exit ctnetlink_exit(void)
3442 {
3443 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3444
3445 unregister_pernet_subsys(&ctnetlink_net_ops);
3446 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3447 nfnetlink_subsys_unregister(&ctnl_subsys);
3448 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3449 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3450 #endif
3451 synchronize_rcu();
3452 }
3453
3454 module_init(ctnetlink_init);
3455 module_exit(ctnetlink_exit);
3456
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