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[mirror_ubuntu-artful-kernel.git] / net / netfilter / nf_conntrack_netlink.c
1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/security.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
32
33 #include <linux/netfilter.h>
34 #include <net/netlink.h>
35 #include <net/sock.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_core.h>
38 #include <net/netfilter/nf_conntrack_expect.h>
39 #include <net/netfilter/nf_conntrack_helper.h>
40 #include <net/netfilter/nf_conntrack_seqadj.h>
41 #include <net/netfilter/nf_conntrack_l3proto.h>
42 #include <net/netfilter/nf_conntrack_l4proto.h>
43 #include <net/netfilter/nf_conntrack_tuple.h>
44 #include <net/netfilter/nf_conntrack_acct.h>
45 #include <net/netfilter/nf_conntrack_zones.h>
46 #include <net/netfilter/nf_conntrack_timestamp.h>
47 #include <net/netfilter/nf_conntrack_labels.h>
48 #include <net/netfilter/nf_conntrack_seqadj.h>
49 #include <net/netfilter/nf_conntrack_synproxy.h>
50 #ifdef CONFIG_NF_NAT_NEEDED
51 #include <net/netfilter/nf_nat_core.h>
52 #include <net/netfilter/nf_nat_l4proto.h>
53 #include <net/netfilter/nf_nat_helper.h>
54 #endif
55
56 #include <linux/netfilter/nfnetlink.h>
57 #include <linux/netfilter/nfnetlink_conntrack.h>
58
59 MODULE_LICENSE("GPL");
60
61 static char __initdata version[] = "0.93";
62
63 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
64 const struct nf_conntrack_tuple *tuple,
65 struct nf_conntrack_l4proto *l4proto)
66 {
67 int ret = 0;
68 struct nlattr *nest_parms;
69
70 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
71 if (!nest_parms)
72 goto nla_put_failure;
73 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
74 goto nla_put_failure;
75
76 if (likely(l4proto->tuple_to_nlattr))
77 ret = l4proto->tuple_to_nlattr(skb, tuple);
78
79 nla_nest_end(skb, nest_parms);
80
81 return ret;
82
83 nla_put_failure:
84 return -1;
85 }
86
87 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
88 const struct nf_conntrack_tuple *tuple,
89 struct nf_conntrack_l3proto *l3proto)
90 {
91 int ret = 0;
92 struct nlattr *nest_parms;
93
94 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
95 if (!nest_parms)
96 goto nla_put_failure;
97
98 if (likely(l3proto->tuple_to_nlattr))
99 ret = l3proto->tuple_to_nlattr(skb, tuple);
100
101 nla_nest_end(skb, nest_parms);
102
103 return ret;
104
105 nla_put_failure:
106 return -1;
107 }
108
109 static int ctnetlink_dump_tuples(struct sk_buff *skb,
110 const struct nf_conntrack_tuple *tuple)
111 {
112 int ret;
113 struct nf_conntrack_l3proto *l3proto;
114 struct nf_conntrack_l4proto *l4proto;
115
116 rcu_read_lock();
117 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
118 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
119
120 if (ret >= 0) {
121 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
122 tuple->dst.protonum);
123 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
124 }
125 rcu_read_unlock();
126 return ret;
127 }
128
129 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
130 const struct nf_conntrack_zone *zone, int dir)
131 {
132 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
133 return 0;
134 if (nla_put_be16(skb, attrtype, htons(zone->id)))
135 goto nla_put_failure;
136 return 0;
137
138 nla_put_failure:
139 return -1;
140 }
141
142 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
143 {
144 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
145 goto nla_put_failure;
146 return 0;
147
148 nla_put_failure:
149 return -1;
150 }
151
152 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
153 {
154 long timeout = nf_ct_expires(ct) / HZ;
155
156 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
157 goto nla_put_failure;
158 return 0;
159
160 nla_put_failure:
161 return -1;
162 }
163
164 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
165 {
166 struct nf_conntrack_l4proto *l4proto;
167 struct nlattr *nest_proto;
168 int ret;
169
170 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
171 if (!l4proto->to_nlattr)
172 return 0;
173
174 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
175 if (!nest_proto)
176 goto nla_put_failure;
177
178 ret = l4proto->to_nlattr(skb, nest_proto, ct);
179
180 nla_nest_end(skb, nest_proto);
181
182 return ret;
183
184 nla_put_failure:
185 return -1;
186 }
187
188 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
189 const struct nf_conn *ct)
190 {
191 struct nlattr *nest_helper;
192 const struct nf_conn_help *help = nfct_help(ct);
193 struct nf_conntrack_helper *helper;
194
195 if (!help)
196 return 0;
197
198 helper = rcu_dereference(help->helper);
199 if (!helper)
200 goto out;
201
202 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
203 if (!nest_helper)
204 goto nla_put_failure;
205 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
206 goto nla_put_failure;
207
208 if (helper->to_nlattr)
209 helper->to_nlattr(skb, ct);
210
211 nla_nest_end(skb, nest_helper);
212 out:
213 return 0;
214
215 nla_put_failure:
216 return -1;
217 }
218
219 static int
220 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
221 enum ip_conntrack_dir dir, int type)
222 {
223 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
224 struct nf_conn_counter *counter = acct->counter;
225 struct nlattr *nest_count;
226 u64 pkts, bytes;
227
228 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
229 pkts = atomic64_xchg(&counter[dir].packets, 0);
230 bytes = atomic64_xchg(&counter[dir].bytes, 0);
231 } else {
232 pkts = atomic64_read(&counter[dir].packets);
233 bytes = atomic64_read(&counter[dir].bytes);
234 }
235
236 nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
237 if (!nest_count)
238 goto nla_put_failure;
239
240 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
241 CTA_COUNTERS_PAD) ||
242 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
243 CTA_COUNTERS_PAD))
244 goto nla_put_failure;
245
246 nla_nest_end(skb, nest_count);
247
248 return 0;
249
250 nla_put_failure:
251 return -1;
252 }
253
254 static int
255 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
256 {
257 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
258
259 if (!acct)
260 return 0;
261
262 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
263 return -1;
264 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
265 return -1;
266
267 return 0;
268 }
269
270 static int
271 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
272 {
273 struct nlattr *nest_count;
274 const struct nf_conn_tstamp *tstamp;
275
276 tstamp = nf_conn_tstamp_find(ct);
277 if (!tstamp)
278 return 0;
279
280 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
281 if (!nest_count)
282 goto nla_put_failure;
283
284 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
285 CTA_TIMESTAMP_PAD) ||
286 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
287 cpu_to_be64(tstamp->stop),
288 CTA_TIMESTAMP_PAD)))
289 goto nla_put_failure;
290 nla_nest_end(skb, nest_count);
291
292 return 0;
293
294 nla_put_failure:
295 return -1;
296 }
297
298 #ifdef CONFIG_NF_CONNTRACK_MARK
299 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
300 {
301 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
302 goto nla_put_failure;
303 return 0;
304
305 nla_put_failure:
306 return -1;
307 }
308 #else
309 #define ctnetlink_dump_mark(a, b) (0)
310 #endif
311
312 #ifdef CONFIG_NF_CONNTRACK_SECMARK
313 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
314 {
315 struct nlattr *nest_secctx;
316 int len, ret;
317 char *secctx;
318
319 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
320 if (ret)
321 return 0;
322
323 ret = -1;
324 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
325 if (!nest_secctx)
326 goto nla_put_failure;
327
328 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
329 goto nla_put_failure;
330 nla_nest_end(skb, nest_secctx);
331
332 ret = 0;
333 nla_put_failure:
334 security_release_secctx(secctx, len);
335 return ret;
336 }
337 #else
338 #define ctnetlink_dump_secctx(a, b) (0)
339 #endif
340
341 #ifdef CONFIG_NF_CONNTRACK_LABELS
342 static inline int ctnetlink_label_size(const struct nf_conn *ct)
343 {
344 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
345
346 if (!labels)
347 return 0;
348 return nla_total_size(sizeof(labels->bits));
349 }
350
351 static int
352 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
353 {
354 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
355 unsigned int i;
356
357 if (!labels)
358 return 0;
359
360 i = 0;
361 do {
362 if (labels->bits[i] != 0)
363 return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
364 labels->bits);
365 i++;
366 } while (i < ARRAY_SIZE(labels->bits));
367
368 return 0;
369 }
370 #else
371 #define ctnetlink_dump_labels(a, b) (0)
372 #define ctnetlink_label_size(a) (0)
373 #endif
374
375 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
376
377 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
378 {
379 struct nlattr *nest_parms;
380
381 if (!(ct->status & IPS_EXPECTED))
382 return 0;
383
384 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
385 if (!nest_parms)
386 goto nla_put_failure;
387 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
388 goto nla_put_failure;
389 nla_nest_end(skb, nest_parms);
390
391 return 0;
392
393 nla_put_failure:
394 return -1;
395 }
396
397 static int
398 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
399 {
400 struct nlattr *nest_parms;
401
402 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
403 if (!nest_parms)
404 goto nla_put_failure;
405
406 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
407 htonl(seq->correction_pos)) ||
408 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
409 htonl(seq->offset_before)) ||
410 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
411 htonl(seq->offset_after)))
412 goto nla_put_failure;
413
414 nla_nest_end(skb, nest_parms);
415
416 return 0;
417
418 nla_put_failure:
419 return -1;
420 }
421
422 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
423 {
424 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
425 struct nf_ct_seqadj *seq;
426
427 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
428 return 0;
429
430 spin_lock_bh(&ct->lock);
431 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
432 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
433 goto err;
434
435 seq = &seqadj->seq[IP_CT_DIR_REPLY];
436 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
437 goto err;
438
439 spin_unlock_bh(&ct->lock);
440 return 0;
441 err:
442 spin_unlock_bh(&ct->lock);
443 return -1;
444 }
445
446 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
447 {
448 if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
449 goto nla_put_failure;
450 return 0;
451
452 nla_put_failure:
453 return -1;
454 }
455
456 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
457 {
458 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
459 goto nla_put_failure;
460 return 0;
461
462 nla_put_failure:
463 return -1;
464 }
465
466 static int
467 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
468 struct nf_conn *ct)
469 {
470 const struct nf_conntrack_zone *zone;
471 struct nlmsghdr *nlh;
472 struct nfgenmsg *nfmsg;
473 struct nlattr *nest_parms;
474 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
475
476 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
477 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
478 if (nlh == NULL)
479 goto nlmsg_failure;
480
481 nfmsg = nlmsg_data(nlh);
482 nfmsg->nfgen_family = nf_ct_l3num(ct);
483 nfmsg->version = NFNETLINK_V0;
484 nfmsg->res_id = 0;
485
486 zone = nf_ct_zone(ct);
487
488 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
489 if (!nest_parms)
490 goto nla_put_failure;
491 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
492 goto nla_put_failure;
493 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
494 NF_CT_ZONE_DIR_ORIG) < 0)
495 goto nla_put_failure;
496 nla_nest_end(skb, nest_parms);
497
498 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | 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_REPLY)) < 0)
502 goto nla_put_failure;
503 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
504 NF_CT_ZONE_DIR_REPL) < 0)
505 goto nla_put_failure;
506 nla_nest_end(skb, nest_parms);
507
508 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
509 NF_CT_DEFAULT_ZONE_DIR) < 0)
510 goto nla_put_failure;
511
512 if (ctnetlink_dump_status(skb, ct) < 0 ||
513 ctnetlink_dump_timeout(skb, ct) < 0 ||
514 ctnetlink_dump_acct(skb, ct, type) < 0 ||
515 ctnetlink_dump_timestamp(skb, ct) < 0 ||
516 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
517 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
518 ctnetlink_dump_mark(skb, ct) < 0 ||
519 ctnetlink_dump_secctx(skb, ct) < 0 ||
520 ctnetlink_dump_labels(skb, ct) < 0 ||
521 ctnetlink_dump_id(skb, ct) < 0 ||
522 ctnetlink_dump_use(skb, ct) < 0 ||
523 ctnetlink_dump_master(skb, ct) < 0 ||
524 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
525 goto nla_put_failure;
526
527 nlmsg_end(skb, nlh);
528 return skb->len;
529
530 nlmsg_failure:
531 nla_put_failure:
532 nlmsg_cancel(skb, nlh);
533 return -1;
534 }
535
536 static inline size_t ctnetlink_proto_size(const struct nf_conn *ct)
537 {
538 struct nf_conntrack_l3proto *l3proto;
539 struct nf_conntrack_l4proto *l4proto;
540 size_t len = 0;
541
542 rcu_read_lock();
543 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
544 len += l3proto->nla_size;
545
546 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
547 len += l4proto->nla_size;
548 rcu_read_unlock();
549
550 return len;
551 }
552
553 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
554 {
555 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
556 return 0;
557 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
558 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
559 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
560 ;
561 }
562
563 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
564 {
565 #ifdef CONFIG_NF_CONNTRACK_SECMARK
566 int len, ret;
567
568 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
569 if (ret)
570 return 0;
571
572 return nla_total_size(0) /* CTA_SECCTX */
573 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
574 #else
575 return 0;
576 #endif
577 }
578
579 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
580 {
581 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
582 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
583 return 0;
584 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
585 #else
586 return 0;
587 #endif
588 }
589
590 #ifdef CONFIG_NF_CONNTRACK_EVENTS
591 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
592 {
593 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
594 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
595 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
596 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
597 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
598 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
599 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
600 + ctnetlink_acct_size(ct)
601 + ctnetlink_timestamp_size(ct)
602 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
603 + nla_total_size(0) /* CTA_PROTOINFO */
604 + nla_total_size(0) /* CTA_HELP */
605 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
606 + ctnetlink_secctx_size(ct)
607 #ifdef CONFIG_NF_NAT_NEEDED
608 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
609 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
610 #endif
611 #ifdef CONFIG_NF_CONNTRACK_MARK
612 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
613 #endif
614 #ifdef CONFIG_NF_CONNTRACK_ZONES
615 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
616 #endif
617 + ctnetlink_proto_size(ct)
618 + ctnetlink_label_size(ct)
619 ;
620 }
621
622 static int
623 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
624 {
625 const struct nf_conntrack_zone *zone;
626 struct net *net;
627 struct nlmsghdr *nlh;
628 struct nfgenmsg *nfmsg;
629 struct nlattr *nest_parms;
630 struct nf_conn *ct = item->ct;
631 struct sk_buff *skb;
632 unsigned int type;
633 unsigned int flags = 0, group;
634 int err;
635
636 if (events & (1 << IPCT_DESTROY)) {
637 type = IPCTNL_MSG_CT_DELETE;
638 group = NFNLGRP_CONNTRACK_DESTROY;
639 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
640 type = IPCTNL_MSG_CT_NEW;
641 flags = NLM_F_CREATE|NLM_F_EXCL;
642 group = NFNLGRP_CONNTRACK_NEW;
643 } else if (events) {
644 type = IPCTNL_MSG_CT_NEW;
645 group = NFNLGRP_CONNTRACK_UPDATE;
646 } else
647 return 0;
648
649 net = nf_ct_net(ct);
650 if (!item->report && !nfnetlink_has_listeners(net, group))
651 return 0;
652
653 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
654 if (skb == NULL)
655 goto errout;
656
657 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
658 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
659 if (nlh == NULL)
660 goto nlmsg_failure;
661
662 nfmsg = nlmsg_data(nlh);
663 nfmsg->nfgen_family = nf_ct_l3num(ct);
664 nfmsg->version = NFNETLINK_V0;
665 nfmsg->res_id = 0;
666
667 rcu_read_lock();
668 zone = nf_ct_zone(ct);
669
670 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
671 if (!nest_parms)
672 goto nla_put_failure;
673 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
674 goto nla_put_failure;
675 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
676 NF_CT_ZONE_DIR_ORIG) < 0)
677 goto nla_put_failure;
678 nla_nest_end(skb, nest_parms);
679
680 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
681 if (!nest_parms)
682 goto nla_put_failure;
683 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
684 goto nla_put_failure;
685 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
686 NF_CT_ZONE_DIR_REPL) < 0)
687 goto nla_put_failure;
688 nla_nest_end(skb, nest_parms);
689
690 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
691 NF_CT_DEFAULT_ZONE_DIR) < 0)
692 goto nla_put_failure;
693
694 if (ctnetlink_dump_id(skb, ct) < 0)
695 goto nla_put_failure;
696
697 if (ctnetlink_dump_status(skb, ct) < 0)
698 goto nla_put_failure;
699
700 if (events & (1 << IPCT_DESTROY)) {
701 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
702 ctnetlink_dump_timestamp(skb, ct) < 0)
703 goto nla_put_failure;
704 } else {
705 if (ctnetlink_dump_timeout(skb, ct) < 0)
706 goto nla_put_failure;
707
708 if (events & (1 << IPCT_PROTOINFO)
709 && ctnetlink_dump_protoinfo(skb, ct) < 0)
710 goto nla_put_failure;
711
712 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
713 && ctnetlink_dump_helpinfo(skb, ct) < 0)
714 goto nla_put_failure;
715
716 #ifdef CONFIG_NF_CONNTRACK_SECMARK
717 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
718 && ctnetlink_dump_secctx(skb, ct) < 0)
719 goto nla_put_failure;
720 #endif
721 if (events & (1 << IPCT_LABEL) &&
722 ctnetlink_dump_labels(skb, ct) < 0)
723 goto nla_put_failure;
724
725 if (events & (1 << IPCT_RELATED) &&
726 ctnetlink_dump_master(skb, ct) < 0)
727 goto nla_put_failure;
728
729 if (events & (1 << IPCT_SEQADJ) &&
730 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
731 goto nla_put_failure;
732 }
733
734 #ifdef CONFIG_NF_CONNTRACK_MARK
735 if ((events & (1 << IPCT_MARK) || ct->mark)
736 && ctnetlink_dump_mark(skb, ct) < 0)
737 goto nla_put_failure;
738 #endif
739 rcu_read_unlock();
740
741 nlmsg_end(skb, nlh);
742 err = nfnetlink_send(skb, net, item->portid, group, item->report,
743 GFP_ATOMIC);
744 if (err == -ENOBUFS || err == -EAGAIN)
745 return -ENOBUFS;
746
747 return 0;
748
749 nla_put_failure:
750 rcu_read_unlock();
751 nlmsg_cancel(skb, nlh);
752 nlmsg_failure:
753 kfree_skb(skb);
754 errout:
755 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
756 return -ENOBUFS;
757
758 return 0;
759 }
760 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
761
762 static int ctnetlink_done(struct netlink_callback *cb)
763 {
764 if (cb->args[1])
765 nf_ct_put((struct nf_conn *)cb->args[1]);
766 kfree(cb->data);
767 return 0;
768 }
769
770 struct ctnetlink_filter {
771 struct {
772 u_int32_t val;
773 u_int32_t mask;
774 } mark;
775 };
776
777 static struct ctnetlink_filter *
778 ctnetlink_alloc_filter(const struct nlattr * const cda[])
779 {
780 #ifdef CONFIG_NF_CONNTRACK_MARK
781 struct ctnetlink_filter *filter;
782
783 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
784 if (filter == NULL)
785 return ERR_PTR(-ENOMEM);
786
787 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
788 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
789
790 return filter;
791 #else
792 return ERR_PTR(-EOPNOTSUPP);
793 #endif
794 }
795
796 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
797 {
798 struct ctnetlink_filter *filter = data;
799
800 if (filter == NULL)
801 return 1;
802
803 #ifdef CONFIG_NF_CONNTRACK_MARK
804 if ((ct->mark & filter->mark.mask) == filter->mark.val)
805 return 1;
806 #endif
807
808 return 0;
809 }
810
811 static int
812 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
813 {
814 struct net *net = sock_net(skb->sk);
815 struct nf_conn *ct, *last;
816 struct nf_conntrack_tuple_hash *h;
817 struct hlist_nulls_node *n;
818 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
819 u_int8_t l3proto = nfmsg->nfgen_family;
820 struct nf_conn *nf_ct_evict[8];
821 int res, i;
822 spinlock_t *lockp;
823
824 last = (struct nf_conn *)cb->args[1];
825 i = 0;
826
827 local_bh_disable();
828 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
829 restart:
830 while (i) {
831 i--;
832 if (nf_ct_should_gc(nf_ct_evict[i]))
833 nf_ct_kill(nf_ct_evict[i]);
834 nf_ct_put(nf_ct_evict[i]);
835 }
836
837 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
838 nf_conntrack_lock(lockp);
839 if (cb->args[0] >= nf_conntrack_htable_size) {
840 spin_unlock(lockp);
841 goto out;
842 }
843 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
844 hnnode) {
845 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
846 continue;
847 ct = nf_ct_tuplehash_to_ctrack(h);
848 if (nf_ct_is_expired(ct)) {
849 if (i < ARRAY_SIZE(nf_ct_evict) &&
850 atomic_inc_not_zero(&ct->ct_general.use))
851 nf_ct_evict[i++] = ct;
852 continue;
853 }
854
855 if (!net_eq(net, nf_ct_net(ct)))
856 continue;
857
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_put(last);
895
896 while (i) {
897 i--;
898 if (nf_ct_should_gc(nf_ct_evict[i]))
899 nf_ct_kill(nf_ct_evict[i]);
900 nf_ct_put(nf_ct_evict[i]);
901 }
902
903 return skb->len;
904 }
905
906 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
907 struct nf_conntrack_tuple *tuple)
908 {
909 struct nlattr *tb[CTA_IP_MAX+1];
910 struct nf_conntrack_l3proto *l3proto;
911 int ret = 0;
912
913 ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL, NULL);
914 if (ret < 0)
915 return ret;
916
917 rcu_read_lock();
918 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
919
920 if (likely(l3proto->nlattr_to_tuple)) {
921 ret = nla_validate_nested(attr, CTA_IP_MAX,
922 l3proto->nla_policy, NULL);
923 if (ret == 0)
924 ret = l3proto->nlattr_to_tuple(tb, tuple);
925 }
926
927 rcu_read_unlock();
928
929 return ret;
930 }
931
932 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
933 [CTA_PROTO_NUM] = { .type = NLA_U8 },
934 };
935
936 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
937 struct nf_conntrack_tuple *tuple)
938 {
939 struct nlattr *tb[CTA_PROTO_MAX+1];
940 struct nf_conntrack_l4proto *l4proto;
941 int ret = 0;
942
943 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy,
944 NULL);
945 if (ret < 0)
946 return ret;
947
948 if (!tb[CTA_PROTO_NUM])
949 return -EINVAL;
950 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
951
952 rcu_read_lock();
953 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
954
955 if (likely(l4proto->nlattr_to_tuple)) {
956 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
957 l4proto->nla_policy, NULL);
958 if (ret == 0)
959 ret = l4proto->nlattr_to_tuple(tb, tuple);
960 }
961
962 rcu_read_unlock();
963
964 return ret;
965 }
966
967 static int
968 ctnetlink_parse_zone(const struct nlattr *attr,
969 struct nf_conntrack_zone *zone)
970 {
971 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
972 NF_CT_DEFAULT_ZONE_DIR, 0);
973 #ifdef CONFIG_NF_CONNTRACK_ZONES
974 if (attr)
975 zone->id = ntohs(nla_get_be16(attr));
976 #else
977 if (attr)
978 return -EOPNOTSUPP;
979 #endif
980 return 0;
981 }
982
983 static int
984 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
985 struct nf_conntrack_zone *zone)
986 {
987 int ret;
988
989 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
990 return -EINVAL;
991
992 ret = ctnetlink_parse_zone(attr, zone);
993 if (ret < 0)
994 return ret;
995
996 if (type == CTA_TUPLE_REPLY)
997 zone->dir = NF_CT_ZONE_DIR_REPL;
998 else
999 zone->dir = NF_CT_ZONE_DIR_ORIG;
1000
1001 return 0;
1002 }
1003
1004 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1005 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1006 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1007 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1008 };
1009
1010 static int
1011 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1012 struct nf_conntrack_tuple *tuple, u32 type,
1013 u_int8_t l3num, struct nf_conntrack_zone *zone)
1014 {
1015 struct nlattr *tb[CTA_TUPLE_MAX+1];
1016 int err;
1017
1018 memset(tuple, 0, sizeof(*tuple));
1019
1020 err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy,
1021 NULL);
1022 if (err < 0)
1023 return err;
1024
1025 if (!tb[CTA_TUPLE_IP])
1026 return -EINVAL;
1027
1028 tuple->src.l3num = l3num;
1029
1030 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
1031 if (err < 0)
1032 return err;
1033
1034 if (!tb[CTA_TUPLE_PROTO])
1035 return -EINVAL;
1036
1037 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
1038 if (err < 0)
1039 return err;
1040
1041 if (tb[CTA_TUPLE_ZONE]) {
1042 if (!zone)
1043 return -EINVAL;
1044
1045 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1046 type, zone);
1047 if (err < 0)
1048 return err;
1049 }
1050
1051 /* orig and expect tuples get DIR_ORIGINAL */
1052 if (type == CTA_TUPLE_REPLY)
1053 tuple->dst.dir = IP_CT_DIR_REPLY;
1054 else
1055 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1056
1057 return 0;
1058 }
1059
1060 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1061 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1062 .len = NF_CT_HELPER_NAME_LEN - 1 },
1063 };
1064
1065 static int 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, NULL);
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 ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1128 struct sk_buff *skb,
1129 const struct nlmsghdr *nlh,
1130 const struct nlattr * const cda[])
1131 {
1132 struct nf_conntrack_tuple_hash *h;
1133 struct nf_conntrack_tuple tuple;
1134 struct nf_conn *ct;
1135 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1136 u_int8_t u3 = nfmsg->nfgen_family;
1137 struct nf_conntrack_zone zone;
1138 int err;
1139
1140 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1141 if (err < 0)
1142 return err;
1143
1144 if (cda[CTA_TUPLE_ORIG])
1145 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1146 u3, &zone);
1147 else if (cda[CTA_TUPLE_REPLY])
1148 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1149 u3, &zone);
1150 else {
1151 return ctnetlink_flush_conntrack(net, cda,
1152 NETLINK_CB(skb).portid,
1153 nlmsg_report(nlh));
1154 }
1155
1156 if (err < 0)
1157 return err;
1158
1159 h = nf_conntrack_find_get(net, &zone, &tuple);
1160 if (!h)
1161 return -ENOENT;
1162
1163 ct = nf_ct_tuplehash_to_ctrack(h);
1164
1165 if (cda[CTA_ID]) {
1166 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1167 if (id != (u32)(unsigned long)ct) {
1168 nf_ct_put(ct);
1169 return -ENOENT;
1170 }
1171 }
1172
1173 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1174 nf_ct_put(ct);
1175
1176 return 0;
1177 }
1178
1179 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1180 struct sk_buff *skb,
1181 const struct nlmsghdr *nlh,
1182 const struct nlattr * const cda[])
1183 {
1184 struct nf_conntrack_tuple_hash *h;
1185 struct nf_conntrack_tuple tuple;
1186 struct nf_conn *ct;
1187 struct sk_buff *skb2 = NULL;
1188 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1189 u_int8_t u3 = nfmsg->nfgen_family;
1190 struct nf_conntrack_zone zone;
1191 int err;
1192
1193 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1194 struct netlink_dump_control c = {
1195 .dump = ctnetlink_dump_table,
1196 .done = ctnetlink_done,
1197 };
1198
1199 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1200 struct ctnetlink_filter *filter;
1201
1202 filter = ctnetlink_alloc_filter(cda);
1203 if (IS_ERR(filter))
1204 return PTR_ERR(filter);
1205
1206 c.data = filter;
1207 }
1208 return netlink_dump_start(ctnl, skb, nlh, &c);
1209 }
1210
1211 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1212 if (err < 0)
1213 return err;
1214
1215 if (cda[CTA_TUPLE_ORIG])
1216 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1217 u3, &zone);
1218 else if (cda[CTA_TUPLE_REPLY])
1219 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1220 u3, &zone);
1221 else
1222 return -EINVAL;
1223
1224 if (err < 0)
1225 return err;
1226
1227 h = nf_conntrack_find_get(net, &zone, &tuple);
1228 if (!h)
1229 return -ENOENT;
1230
1231 ct = nf_ct_tuplehash_to_ctrack(h);
1232
1233 err = -ENOMEM;
1234 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1235 if (skb2 == NULL) {
1236 nf_ct_put(ct);
1237 return -ENOMEM;
1238 }
1239
1240 rcu_read_lock();
1241 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1242 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1243 rcu_read_unlock();
1244 nf_ct_put(ct);
1245 if (err <= 0)
1246 goto free;
1247
1248 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1249 if (err < 0)
1250 goto out;
1251
1252 return 0;
1253
1254 free:
1255 kfree_skb(skb2);
1256 out:
1257 /* this avoids a loop in nfnetlink. */
1258 return err == -EAGAIN ? -ENOBUFS : err;
1259 }
1260
1261 static int ctnetlink_done_list(struct netlink_callback *cb)
1262 {
1263 if (cb->args[1])
1264 nf_ct_put((struct nf_conn *)cb->args[1]);
1265 return 0;
1266 }
1267
1268 static int
1269 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1270 {
1271 struct nf_conn *ct, *last;
1272 struct nf_conntrack_tuple_hash *h;
1273 struct hlist_nulls_node *n;
1274 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1275 u_int8_t l3proto = nfmsg->nfgen_family;
1276 int res;
1277 int cpu;
1278 struct hlist_nulls_head *list;
1279 struct net *net = sock_net(skb->sk);
1280
1281 if (cb->args[2])
1282 return 0;
1283
1284 last = (struct nf_conn *)cb->args[1];
1285
1286 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1287 struct ct_pcpu *pcpu;
1288
1289 if (!cpu_possible(cpu))
1290 continue;
1291
1292 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1293 spin_lock_bh(&pcpu->lock);
1294 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1295 restart:
1296 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1297 ct = nf_ct_tuplehash_to_ctrack(h);
1298 if (l3proto && nf_ct_l3num(ct) != l3proto)
1299 continue;
1300 if (cb->args[1]) {
1301 if (ct != last)
1302 continue;
1303 cb->args[1] = 0;
1304 }
1305 rcu_read_lock();
1306 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1307 cb->nlh->nlmsg_seq,
1308 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1309 ct);
1310 rcu_read_unlock();
1311 if (res < 0) {
1312 if (!atomic_inc_not_zero(&ct->ct_general.use))
1313 continue;
1314 cb->args[0] = cpu;
1315 cb->args[1] = (unsigned long)ct;
1316 spin_unlock_bh(&pcpu->lock);
1317 goto out;
1318 }
1319 }
1320 if (cb->args[1]) {
1321 cb->args[1] = 0;
1322 goto restart;
1323 }
1324 spin_unlock_bh(&pcpu->lock);
1325 }
1326 cb->args[2] = 1;
1327 out:
1328 if (last)
1329 nf_ct_put(last);
1330
1331 return skb->len;
1332 }
1333
1334 static int
1335 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1336 {
1337 return ctnetlink_dump_list(skb, cb, true);
1338 }
1339
1340 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1341 struct sk_buff *skb,
1342 const struct nlmsghdr *nlh,
1343 const struct nlattr * const cda[])
1344 {
1345 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1346 struct netlink_dump_control c = {
1347 .dump = ctnetlink_dump_dying,
1348 .done = ctnetlink_done_list,
1349 };
1350 return netlink_dump_start(ctnl, skb, nlh, &c);
1351 }
1352
1353 return -EOPNOTSUPP;
1354 }
1355
1356 static int
1357 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1358 {
1359 return ctnetlink_dump_list(skb, cb, false);
1360 }
1361
1362 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1363 struct sk_buff *skb,
1364 const struct nlmsghdr *nlh,
1365 const struct nlattr * const cda[])
1366 {
1367 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1368 struct netlink_dump_control c = {
1369 .dump = ctnetlink_dump_unconfirmed,
1370 .done = ctnetlink_done_list,
1371 };
1372 return netlink_dump_start(ctnl, skb, nlh, &c);
1373 }
1374
1375 return -EOPNOTSUPP;
1376 }
1377
1378 #ifdef CONFIG_NF_NAT_NEEDED
1379 static int
1380 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1381 enum nf_nat_manip_type manip,
1382 const struct nlattr *attr)
1383 {
1384 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1385 int err;
1386
1387 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1388 if (!parse_nat_setup) {
1389 #ifdef CONFIG_MODULES
1390 rcu_read_unlock();
1391 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1392 if (request_module("nf-nat") < 0) {
1393 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1394 rcu_read_lock();
1395 return -EOPNOTSUPP;
1396 }
1397 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1398 rcu_read_lock();
1399 if (nfnetlink_parse_nat_setup_hook)
1400 return -EAGAIN;
1401 #endif
1402 return -EOPNOTSUPP;
1403 }
1404
1405 err = parse_nat_setup(ct, manip, attr);
1406 if (err == -EAGAIN) {
1407 #ifdef CONFIG_MODULES
1408 rcu_read_unlock();
1409 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1410 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1411 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1412 rcu_read_lock();
1413 return -EOPNOTSUPP;
1414 }
1415 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1416 rcu_read_lock();
1417 #else
1418 err = -EOPNOTSUPP;
1419 #endif
1420 }
1421 return err;
1422 }
1423 #endif
1424
1425 static void
1426 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1427 unsigned long off)
1428 {
1429 unsigned int bit;
1430
1431 /* Ignore these unchangable bits */
1432 on &= ~IPS_UNCHANGEABLE_MASK;
1433 off &= ~IPS_UNCHANGEABLE_MASK;
1434
1435 for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1436 if (on & (1 << bit))
1437 set_bit(bit, &ct->status);
1438 else if (off & (1 << bit))
1439 clear_bit(bit, &ct->status);
1440 }
1441 }
1442
1443 static int
1444 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1445 {
1446 unsigned long d;
1447 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1448 d = ct->status ^ status;
1449
1450 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1451 /* unchangeable */
1452 return -EBUSY;
1453
1454 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1455 /* SEEN_REPLY bit can only be set */
1456 return -EBUSY;
1457
1458 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1459 /* ASSURED bit can only be set */
1460 return -EBUSY;
1461
1462 __ctnetlink_change_status(ct, status, 0);
1463 return 0;
1464 }
1465
1466 static int
1467 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1468 {
1469 #ifdef CONFIG_NF_NAT_NEEDED
1470 int ret;
1471
1472 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1473 return 0;
1474
1475 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1476 cda[CTA_NAT_DST]);
1477 if (ret < 0)
1478 return ret;
1479
1480 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1481 cda[CTA_NAT_SRC]);
1482 return ret;
1483 #else
1484 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1485 return 0;
1486 return -EOPNOTSUPP;
1487 #endif
1488 }
1489
1490 static int ctnetlink_change_helper(struct nf_conn *ct,
1491 const struct nlattr * const cda[])
1492 {
1493 struct nf_conntrack_helper *helper;
1494 struct nf_conn_help *help = nfct_help(ct);
1495 char *helpname = NULL;
1496 struct nlattr *helpinfo = NULL;
1497 int err;
1498
1499 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1500 if (err < 0)
1501 return err;
1502
1503 /* don't change helper of sibling connections */
1504 if (ct->master) {
1505 /* If we try to change the helper to the same thing twice,
1506 * treat the second attempt as a no-op instead of returning
1507 * an error.
1508 */
1509 err = -EBUSY;
1510 if (help) {
1511 rcu_read_lock();
1512 helper = rcu_dereference(help->helper);
1513 if (helper && !strcmp(helper->name, helpname))
1514 err = 0;
1515 rcu_read_unlock();
1516 }
1517
1518 return err;
1519 }
1520
1521 if (!strcmp(helpname, "")) {
1522 if (help && help->helper) {
1523 /* we had a helper before ... */
1524 nf_ct_remove_expectations(ct);
1525 RCU_INIT_POINTER(help->helper, NULL);
1526 }
1527
1528 return 0;
1529 }
1530
1531 rcu_read_lock();
1532 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1533 nf_ct_protonum(ct));
1534 if (helper == NULL) {
1535 rcu_read_unlock();
1536 return -EOPNOTSUPP;
1537 }
1538
1539 if (help) {
1540 if (help->helper == helper) {
1541 /* update private helper data if allowed. */
1542 if (helper->from_nlattr)
1543 helper->from_nlattr(helpinfo, ct);
1544 err = 0;
1545 } else
1546 err = -EBUSY;
1547 } else {
1548 /* we cannot set a helper for an existing conntrack */
1549 err = -EOPNOTSUPP;
1550 }
1551
1552 rcu_read_unlock();
1553 return err;
1554 }
1555
1556 static int ctnetlink_change_timeout(struct nf_conn *ct,
1557 const struct nlattr * const cda[])
1558 {
1559 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1560
1561 ct->timeout = nfct_time_stamp + timeout * HZ;
1562
1563 if (test_bit(IPS_DYING_BIT, &ct->status))
1564 return -ETIME;
1565
1566 return 0;
1567 }
1568
1569 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1570 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1571 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1572 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1573 };
1574
1575 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
1576 const struct nlattr * const cda[])
1577 {
1578 const struct nlattr *attr = cda[CTA_PROTOINFO];
1579 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1580 struct nf_conntrack_l4proto *l4proto;
1581 int err = 0;
1582
1583 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy,
1584 NULL);
1585 if (err < 0)
1586 return err;
1587
1588 rcu_read_lock();
1589 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1590 if (l4proto->from_nlattr)
1591 err = l4proto->from_nlattr(tb, ct);
1592 rcu_read_unlock();
1593
1594 return err;
1595 }
1596
1597 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1598 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1599 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1600 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1601 };
1602
1603 static int change_seq_adj(struct nf_ct_seqadj *seq,
1604 const struct nlattr * const attr)
1605 {
1606 int err;
1607 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1608
1609 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy, NULL);
1610 if (err < 0)
1611 return err;
1612
1613 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1614 return -EINVAL;
1615
1616 seq->correction_pos =
1617 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1618
1619 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1620 return -EINVAL;
1621
1622 seq->offset_before =
1623 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1624
1625 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1626 return -EINVAL;
1627
1628 seq->offset_after =
1629 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1630
1631 return 0;
1632 }
1633
1634 static int
1635 ctnetlink_change_seq_adj(struct nf_conn *ct,
1636 const struct nlattr * const cda[])
1637 {
1638 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1639 int ret = 0;
1640
1641 if (!seqadj)
1642 return 0;
1643
1644 spin_lock_bh(&ct->lock);
1645 if (cda[CTA_SEQ_ADJ_ORIG]) {
1646 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1647 cda[CTA_SEQ_ADJ_ORIG]);
1648 if (ret < 0)
1649 goto err;
1650
1651 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1652 }
1653
1654 if (cda[CTA_SEQ_ADJ_REPLY]) {
1655 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1656 cda[CTA_SEQ_ADJ_REPLY]);
1657 if (ret < 0)
1658 goto err;
1659
1660 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1661 }
1662
1663 spin_unlock_bh(&ct->lock);
1664 return 0;
1665 err:
1666 spin_unlock_bh(&ct->lock);
1667 return ret;
1668 }
1669
1670 static int
1671 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1672 {
1673 #ifdef CONFIG_NF_CONNTRACK_LABELS
1674 size_t len = nla_len(cda[CTA_LABELS]);
1675 const void *mask = cda[CTA_LABELS_MASK];
1676
1677 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1678 return -EINVAL;
1679
1680 if (mask) {
1681 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1682 nla_len(cda[CTA_LABELS_MASK]) != len)
1683 return -EINVAL;
1684 mask = nla_data(cda[CTA_LABELS_MASK]);
1685 }
1686
1687 len /= sizeof(u32);
1688
1689 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1690 #else
1691 return -EOPNOTSUPP;
1692 #endif
1693 }
1694
1695 static int
1696 ctnetlink_change_conntrack(struct nf_conn *ct,
1697 const struct nlattr * const cda[])
1698 {
1699 int err;
1700
1701 /* only allow NAT changes and master assignation for new conntracks */
1702 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1703 return -EOPNOTSUPP;
1704
1705 if (cda[CTA_HELP]) {
1706 err = ctnetlink_change_helper(ct, cda);
1707 if (err < 0)
1708 return err;
1709 }
1710
1711 if (cda[CTA_TIMEOUT]) {
1712 err = ctnetlink_change_timeout(ct, cda);
1713 if (err < 0)
1714 return err;
1715 }
1716
1717 if (cda[CTA_STATUS]) {
1718 err = ctnetlink_change_status(ct, cda);
1719 if (err < 0)
1720 return err;
1721 }
1722
1723 if (cda[CTA_PROTOINFO]) {
1724 err = ctnetlink_change_protoinfo(ct, cda);
1725 if (err < 0)
1726 return err;
1727 }
1728
1729 #if defined(CONFIG_NF_CONNTRACK_MARK)
1730 if (cda[CTA_MARK])
1731 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1732 #endif
1733
1734 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1735 err = ctnetlink_change_seq_adj(ct, cda);
1736 if (err < 0)
1737 return err;
1738 }
1739
1740 if (cda[CTA_LABELS]) {
1741 err = ctnetlink_attach_labels(ct, cda);
1742 if (err < 0)
1743 return err;
1744 }
1745
1746 return 0;
1747 }
1748
1749 static struct nf_conn *
1750 ctnetlink_create_conntrack(struct net *net,
1751 const struct nf_conntrack_zone *zone,
1752 const struct nlattr * const cda[],
1753 struct nf_conntrack_tuple *otuple,
1754 struct nf_conntrack_tuple *rtuple,
1755 u8 u3)
1756 {
1757 struct nf_conn *ct;
1758 int err = -EINVAL;
1759 struct nf_conntrack_helper *helper;
1760 struct nf_conn_tstamp *tstamp;
1761
1762 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1763 if (IS_ERR(ct))
1764 return ERR_PTR(-ENOMEM);
1765
1766 if (!cda[CTA_TIMEOUT])
1767 goto err1;
1768
1769 ct->timeout = nfct_time_stamp + ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1770
1771 rcu_read_lock();
1772 if (cda[CTA_HELP]) {
1773 char *helpname = NULL;
1774 struct nlattr *helpinfo = NULL;
1775
1776 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1777 if (err < 0)
1778 goto err2;
1779
1780 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1781 nf_ct_protonum(ct));
1782 if (helper == NULL) {
1783 rcu_read_unlock();
1784 #ifdef CONFIG_MODULES
1785 if (request_module("nfct-helper-%s", helpname) < 0) {
1786 err = -EOPNOTSUPP;
1787 goto err1;
1788 }
1789
1790 rcu_read_lock();
1791 helper = __nf_conntrack_helper_find(helpname,
1792 nf_ct_l3num(ct),
1793 nf_ct_protonum(ct));
1794 if (helper) {
1795 err = -EAGAIN;
1796 goto err2;
1797 }
1798 rcu_read_unlock();
1799 #endif
1800 err = -EOPNOTSUPP;
1801 goto err1;
1802 } else {
1803 struct nf_conn_help *help;
1804
1805 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1806 if (help == NULL) {
1807 err = -ENOMEM;
1808 goto err2;
1809 }
1810 /* set private helper data if allowed. */
1811 if (helper->from_nlattr)
1812 helper->from_nlattr(helpinfo, ct);
1813
1814 /* not in hash table yet so not strictly necessary */
1815 RCU_INIT_POINTER(help->helper, helper);
1816 }
1817 } else {
1818 /* try an implicit helper assignation */
1819 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1820 if (err < 0)
1821 goto err2;
1822 }
1823
1824 err = ctnetlink_setup_nat(ct, cda);
1825 if (err < 0)
1826 goto err2;
1827
1828 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1829 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1830 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1831 nf_ct_labels_ext_add(ct);
1832 nfct_seqadj_ext_add(ct);
1833 nfct_synproxy_ext_add(ct);
1834
1835 /* we must add conntrack extensions before confirmation. */
1836 ct->status |= IPS_CONFIRMED;
1837
1838 if (cda[CTA_STATUS]) {
1839 err = ctnetlink_change_status(ct, cda);
1840 if (err < 0)
1841 goto err2;
1842 }
1843
1844 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1845 err = ctnetlink_change_seq_adj(ct, cda);
1846 if (err < 0)
1847 goto err2;
1848 }
1849
1850 memset(&ct->proto, 0, sizeof(ct->proto));
1851 if (cda[CTA_PROTOINFO]) {
1852 err = ctnetlink_change_protoinfo(ct, cda);
1853 if (err < 0)
1854 goto err2;
1855 }
1856
1857 #if defined(CONFIG_NF_CONNTRACK_MARK)
1858 if (cda[CTA_MARK])
1859 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1860 #endif
1861
1862 /* setup master conntrack: this is a confirmed expectation */
1863 if (cda[CTA_TUPLE_MASTER]) {
1864 struct nf_conntrack_tuple master;
1865 struct nf_conntrack_tuple_hash *master_h;
1866 struct nf_conn *master_ct;
1867
1868 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
1869 u3, NULL);
1870 if (err < 0)
1871 goto err2;
1872
1873 master_h = nf_conntrack_find_get(net, zone, &master);
1874 if (master_h == NULL) {
1875 err = -ENOENT;
1876 goto err2;
1877 }
1878 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1879 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1880 ct->master = master_ct;
1881 }
1882 tstamp = nf_conn_tstamp_find(ct);
1883 if (tstamp)
1884 tstamp->start = ktime_get_real_ns();
1885
1886 err = nf_conntrack_hash_check_insert(ct);
1887 if (err < 0)
1888 goto err2;
1889
1890 rcu_read_unlock();
1891
1892 return ct;
1893
1894 err2:
1895 rcu_read_unlock();
1896 err1:
1897 nf_conntrack_free(ct);
1898 return ERR_PTR(err);
1899 }
1900
1901 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
1902 struct sk_buff *skb,
1903 const struct nlmsghdr *nlh,
1904 const struct nlattr * const cda[])
1905 {
1906 struct nf_conntrack_tuple otuple, rtuple;
1907 struct nf_conntrack_tuple_hash *h = NULL;
1908 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1909 struct nf_conn *ct;
1910 u_int8_t u3 = nfmsg->nfgen_family;
1911 struct nf_conntrack_zone zone;
1912 int err;
1913
1914 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1915 if (err < 0)
1916 return err;
1917
1918 if (cda[CTA_TUPLE_ORIG]) {
1919 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
1920 u3, &zone);
1921 if (err < 0)
1922 return err;
1923 }
1924
1925 if (cda[CTA_TUPLE_REPLY]) {
1926 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
1927 u3, &zone);
1928 if (err < 0)
1929 return err;
1930 }
1931
1932 if (cda[CTA_TUPLE_ORIG])
1933 h = nf_conntrack_find_get(net, &zone, &otuple);
1934 else if (cda[CTA_TUPLE_REPLY])
1935 h = nf_conntrack_find_get(net, &zone, &rtuple);
1936
1937 if (h == NULL) {
1938 err = -ENOENT;
1939 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1940 enum ip_conntrack_events events;
1941
1942 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1943 return -EINVAL;
1944 if (otuple.dst.protonum != rtuple.dst.protonum)
1945 return -EINVAL;
1946
1947 ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
1948 &rtuple, u3);
1949 if (IS_ERR(ct))
1950 return PTR_ERR(ct);
1951
1952 err = 0;
1953 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1954 events = 1 << IPCT_RELATED;
1955 else
1956 events = 1 << IPCT_NEW;
1957
1958 if (cda[CTA_LABELS] &&
1959 ctnetlink_attach_labels(ct, cda) == 0)
1960 events |= (1 << IPCT_LABEL);
1961
1962 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1963 (1 << IPCT_ASSURED) |
1964 (1 << IPCT_HELPER) |
1965 (1 << IPCT_PROTOINFO) |
1966 (1 << IPCT_SEQADJ) |
1967 (1 << IPCT_MARK) | events,
1968 ct, NETLINK_CB(skb).portid,
1969 nlmsg_report(nlh));
1970 nf_ct_put(ct);
1971 }
1972
1973 return err;
1974 }
1975 /* implicit 'else' */
1976
1977 err = -EEXIST;
1978 ct = nf_ct_tuplehash_to_ctrack(h);
1979 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1980 err = ctnetlink_change_conntrack(ct, cda);
1981 if (err == 0) {
1982 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1983 (1 << IPCT_ASSURED) |
1984 (1 << IPCT_HELPER) |
1985 (1 << IPCT_LABEL) |
1986 (1 << IPCT_PROTOINFO) |
1987 (1 << IPCT_SEQADJ) |
1988 (1 << IPCT_MARK),
1989 ct, NETLINK_CB(skb).portid,
1990 nlmsg_report(nlh));
1991 }
1992 }
1993
1994 nf_ct_put(ct);
1995 return err;
1996 }
1997
1998 static int
1999 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2000 __u16 cpu, const struct ip_conntrack_stat *st)
2001 {
2002 struct nlmsghdr *nlh;
2003 struct nfgenmsg *nfmsg;
2004 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2005
2006 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2007 IPCTNL_MSG_CT_GET_STATS_CPU);
2008 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2009 if (nlh == NULL)
2010 goto nlmsg_failure;
2011
2012 nfmsg = nlmsg_data(nlh);
2013 nfmsg->nfgen_family = AF_UNSPEC;
2014 nfmsg->version = NFNETLINK_V0;
2015 nfmsg->res_id = htons(cpu);
2016
2017 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2018 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2019 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
2020 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2021 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2022 htonl(st->insert_failed)) ||
2023 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2024 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2025 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2026 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2027 htonl(st->search_restart)))
2028 goto nla_put_failure;
2029
2030 nlmsg_end(skb, nlh);
2031 return skb->len;
2032
2033 nla_put_failure:
2034 nlmsg_failure:
2035 nlmsg_cancel(skb, nlh);
2036 return -1;
2037 }
2038
2039 static int
2040 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2041 {
2042 int cpu;
2043 struct net *net = sock_net(skb->sk);
2044
2045 if (cb->args[0] == nr_cpu_ids)
2046 return 0;
2047
2048 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2049 const struct ip_conntrack_stat *st;
2050
2051 if (!cpu_possible(cpu))
2052 continue;
2053
2054 st = per_cpu_ptr(net->ct.stat, cpu);
2055 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2056 NETLINK_CB(cb->skb).portid,
2057 cb->nlh->nlmsg_seq,
2058 cpu, st) < 0)
2059 break;
2060 }
2061 cb->args[0] = cpu;
2062
2063 return skb->len;
2064 }
2065
2066 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2067 struct sk_buff *skb,
2068 const struct nlmsghdr *nlh,
2069 const struct nlattr * const cda[])
2070 {
2071 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2072 struct netlink_dump_control c = {
2073 .dump = ctnetlink_ct_stat_cpu_dump,
2074 };
2075 return netlink_dump_start(ctnl, skb, nlh, &c);
2076 }
2077
2078 return 0;
2079 }
2080
2081 static int
2082 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2083 struct net *net)
2084 {
2085 struct nlmsghdr *nlh;
2086 struct nfgenmsg *nfmsg;
2087 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2088 unsigned int nr_conntracks = atomic_read(&net->ct.count);
2089
2090 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2091 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2092 if (nlh == NULL)
2093 goto nlmsg_failure;
2094
2095 nfmsg = nlmsg_data(nlh);
2096 nfmsg->nfgen_family = AF_UNSPEC;
2097 nfmsg->version = NFNETLINK_V0;
2098 nfmsg->res_id = 0;
2099
2100 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2101 goto nla_put_failure;
2102
2103 nlmsg_end(skb, nlh);
2104 return skb->len;
2105
2106 nla_put_failure:
2107 nlmsg_failure:
2108 nlmsg_cancel(skb, nlh);
2109 return -1;
2110 }
2111
2112 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2113 struct sk_buff *skb, const struct nlmsghdr *nlh,
2114 const struct nlattr * const cda[])
2115 {
2116 struct sk_buff *skb2;
2117 int err;
2118
2119 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2120 if (skb2 == NULL)
2121 return -ENOMEM;
2122
2123 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2124 nlh->nlmsg_seq,
2125 NFNL_MSG_TYPE(nlh->nlmsg_type),
2126 sock_net(skb->sk));
2127 if (err <= 0)
2128 goto free;
2129
2130 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2131 if (err < 0)
2132 goto out;
2133
2134 return 0;
2135
2136 free:
2137 kfree_skb(skb2);
2138 out:
2139 /* this avoids a loop in nfnetlink. */
2140 return err == -EAGAIN ? -ENOBUFS : err;
2141 }
2142
2143 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2144 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2145 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2146 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2147 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2148 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2149 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2150 .len = NF_CT_HELPER_NAME_LEN - 1 },
2151 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2152 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2153 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2154 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2155 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2156 };
2157
2158 static struct nf_conntrack_expect *
2159 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2160 struct nf_conntrack_helper *helper,
2161 struct nf_conntrack_tuple *tuple,
2162 struct nf_conntrack_tuple *mask);
2163
2164 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2165 static size_t
2166 ctnetlink_glue_build_size(const struct nf_conn *ct)
2167 {
2168 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2169 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2170 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2171 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2172 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2173 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2174 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2175 + nla_total_size(0) /* CTA_PROTOINFO */
2176 + nla_total_size(0) /* CTA_HELP */
2177 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2178 + ctnetlink_secctx_size(ct)
2179 #ifdef CONFIG_NF_NAT_NEEDED
2180 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2181 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2182 #endif
2183 #ifdef CONFIG_NF_CONNTRACK_MARK
2184 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2185 #endif
2186 #ifdef CONFIG_NF_CONNTRACK_ZONES
2187 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2188 #endif
2189 + ctnetlink_proto_size(ct)
2190 ;
2191 }
2192
2193 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2194 enum ip_conntrack_info *ctinfo)
2195 {
2196 return nf_ct_get(skb, ctinfo);
2197 }
2198
2199 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2200 {
2201 const struct nf_conntrack_zone *zone;
2202 struct nlattr *nest_parms;
2203
2204 rcu_read_lock();
2205 zone = nf_ct_zone(ct);
2206
2207 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2208 if (!nest_parms)
2209 goto nla_put_failure;
2210 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2211 goto nla_put_failure;
2212 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2213 NF_CT_ZONE_DIR_ORIG) < 0)
2214 goto nla_put_failure;
2215 nla_nest_end(skb, nest_parms);
2216
2217 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2218 if (!nest_parms)
2219 goto nla_put_failure;
2220 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2221 goto nla_put_failure;
2222 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2223 NF_CT_ZONE_DIR_REPL) < 0)
2224 goto nla_put_failure;
2225 nla_nest_end(skb, nest_parms);
2226
2227 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2228 NF_CT_DEFAULT_ZONE_DIR) < 0)
2229 goto nla_put_failure;
2230
2231 if (ctnetlink_dump_id(skb, ct) < 0)
2232 goto nla_put_failure;
2233
2234 if (ctnetlink_dump_status(skb, ct) < 0)
2235 goto nla_put_failure;
2236
2237 if (ctnetlink_dump_timeout(skb, ct) < 0)
2238 goto nla_put_failure;
2239
2240 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2241 goto nla_put_failure;
2242
2243 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2244 goto nla_put_failure;
2245
2246 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2247 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2248 goto nla_put_failure;
2249 #endif
2250 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2251 goto nla_put_failure;
2252
2253 if ((ct->status & IPS_SEQ_ADJUST) &&
2254 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2255 goto nla_put_failure;
2256
2257 #ifdef CONFIG_NF_CONNTRACK_MARK
2258 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2259 goto nla_put_failure;
2260 #endif
2261 if (ctnetlink_dump_labels(skb, ct) < 0)
2262 goto nla_put_failure;
2263 rcu_read_unlock();
2264 return 0;
2265
2266 nla_put_failure:
2267 rcu_read_unlock();
2268 return -ENOSPC;
2269 }
2270
2271 static int
2272 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2273 enum ip_conntrack_info ctinfo,
2274 u_int16_t ct_attr, u_int16_t ct_info_attr)
2275 {
2276 struct nlattr *nest_parms;
2277
2278 nest_parms = nla_nest_start(skb, ct_attr | NLA_F_NESTED);
2279 if (!nest_parms)
2280 goto nla_put_failure;
2281
2282 if (__ctnetlink_glue_build(skb, ct) < 0)
2283 goto nla_put_failure;
2284
2285 nla_nest_end(skb, nest_parms);
2286
2287 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2288 goto nla_put_failure;
2289
2290 return 0;
2291
2292 nla_put_failure:
2293 return -ENOSPC;
2294 }
2295
2296 static int
2297 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2298 {
2299 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2300 unsigned long d = ct->status ^ status;
2301
2302 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2303 /* SEEN_REPLY bit can only be set */
2304 return -EBUSY;
2305
2306 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2307 /* ASSURED bit can only be set */
2308 return -EBUSY;
2309
2310 /* This check is less strict than ctnetlink_change_status()
2311 * because callers often flip IPS_EXPECTED bits when sending
2312 * an NFQA_CT attribute to the kernel. So ignore the
2313 * unchangeable bits but do not error out. Also user programs
2314 * are allowed to clear the bits that they are allowed to change.
2315 */
2316 __ctnetlink_change_status(ct, status, ~status);
2317 return 0;
2318 }
2319
2320 static int
2321 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2322 {
2323 int err;
2324
2325 if (cda[CTA_TIMEOUT]) {
2326 err = ctnetlink_change_timeout(ct, cda);
2327 if (err < 0)
2328 return err;
2329 }
2330 if (cda[CTA_STATUS]) {
2331 err = ctnetlink_update_status(ct, cda);
2332 if (err < 0)
2333 return err;
2334 }
2335 if (cda[CTA_HELP]) {
2336 err = ctnetlink_change_helper(ct, cda);
2337 if (err < 0)
2338 return err;
2339 }
2340 if (cda[CTA_LABELS]) {
2341 err = ctnetlink_attach_labels(ct, cda);
2342 if (err < 0)
2343 return err;
2344 }
2345 #if defined(CONFIG_NF_CONNTRACK_MARK)
2346 if (cda[CTA_MARK]) {
2347 u32 mask = 0, mark, newmark;
2348 if (cda[CTA_MARK_MASK])
2349 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2350
2351 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2352 newmark = (ct->mark & mask) ^ mark;
2353 if (newmark != ct->mark)
2354 ct->mark = newmark;
2355 }
2356 #endif
2357 return 0;
2358 }
2359
2360 static int
2361 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2362 {
2363 struct nlattr *cda[CTA_MAX+1];
2364 int ret;
2365
2366 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy, NULL);
2367 if (ret < 0)
2368 return ret;
2369
2370 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2371 }
2372
2373 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2374 const struct nf_conn *ct,
2375 struct nf_conntrack_tuple *tuple,
2376 struct nf_conntrack_tuple *mask)
2377 {
2378 int err;
2379
2380 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2381 nf_ct_l3num(ct), NULL);
2382 if (err < 0)
2383 return err;
2384
2385 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2386 nf_ct_l3num(ct), NULL);
2387 }
2388
2389 static int
2390 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2391 u32 portid, u32 report)
2392 {
2393 struct nlattr *cda[CTA_EXPECT_MAX+1];
2394 struct nf_conntrack_tuple tuple, mask;
2395 struct nf_conntrack_helper *helper = NULL;
2396 struct nf_conntrack_expect *exp;
2397 int err;
2398
2399 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy,
2400 NULL);
2401 if (err < 0)
2402 return err;
2403
2404 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2405 ct, &tuple, &mask);
2406 if (err < 0)
2407 return err;
2408
2409 if (cda[CTA_EXPECT_HELP_NAME]) {
2410 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2411
2412 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2413 nf_ct_protonum(ct));
2414 if (helper == NULL)
2415 return -EOPNOTSUPP;
2416 }
2417
2418 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2419 helper, &tuple, &mask);
2420 if (IS_ERR(exp))
2421 return PTR_ERR(exp);
2422
2423 err = nf_ct_expect_related_report(exp, portid, report);
2424 nf_ct_expect_put(exp);
2425 return err;
2426 }
2427
2428 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2429 enum ip_conntrack_info ctinfo, int diff)
2430 {
2431 if (!(ct->status & IPS_NAT_MASK))
2432 return;
2433
2434 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2435 }
2436
2437 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2438 .get_ct = ctnetlink_glue_get_ct,
2439 .build_size = ctnetlink_glue_build_size,
2440 .build = ctnetlink_glue_build,
2441 .parse = ctnetlink_glue_parse,
2442 .attach_expect = ctnetlink_glue_attach_expect,
2443 .seq_adjust = ctnetlink_glue_seqadj,
2444 };
2445 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2446
2447 /***********************************************************************
2448 * EXPECT
2449 ***********************************************************************/
2450
2451 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2452 const struct nf_conntrack_tuple *tuple,
2453 u32 type)
2454 {
2455 struct nlattr *nest_parms;
2456
2457 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2458 if (!nest_parms)
2459 goto nla_put_failure;
2460 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2461 goto nla_put_failure;
2462 nla_nest_end(skb, nest_parms);
2463
2464 return 0;
2465
2466 nla_put_failure:
2467 return -1;
2468 }
2469
2470 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2471 const struct nf_conntrack_tuple *tuple,
2472 const struct nf_conntrack_tuple_mask *mask)
2473 {
2474 int ret;
2475 struct nf_conntrack_l3proto *l3proto;
2476 struct nf_conntrack_l4proto *l4proto;
2477 struct nf_conntrack_tuple m;
2478 struct nlattr *nest_parms;
2479
2480 memset(&m, 0xFF, sizeof(m));
2481 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2482 m.src.u.all = mask->src.u.all;
2483 m.dst.protonum = tuple->dst.protonum;
2484
2485 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2486 if (!nest_parms)
2487 goto nla_put_failure;
2488
2489 rcu_read_lock();
2490 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2491 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2492 if (ret >= 0) {
2493 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2494 tuple->dst.protonum);
2495 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2496 }
2497 rcu_read_unlock();
2498
2499 if (unlikely(ret < 0))
2500 goto nla_put_failure;
2501
2502 nla_nest_end(skb, nest_parms);
2503
2504 return 0;
2505
2506 nla_put_failure:
2507 return -1;
2508 }
2509
2510 static const union nf_inet_addr any_addr;
2511
2512 static int
2513 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2514 const struct nf_conntrack_expect *exp)
2515 {
2516 struct nf_conn *master = exp->master;
2517 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2518 struct nf_conn_help *help;
2519 #ifdef CONFIG_NF_NAT_NEEDED
2520 struct nlattr *nest_parms;
2521 struct nf_conntrack_tuple nat_tuple = {};
2522 #endif
2523 struct nf_ct_helper_expectfn *expfn;
2524
2525 if (timeout < 0)
2526 timeout = 0;
2527
2528 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2529 goto nla_put_failure;
2530 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2531 goto nla_put_failure;
2532 if (ctnetlink_exp_dump_tuple(skb,
2533 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2534 CTA_EXPECT_MASTER) < 0)
2535 goto nla_put_failure;
2536
2537 #ifdef CONFIG_NF_NAT_NEEDED
2538 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2539 exp->saved_proto.all) {
2540 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2541 if (!nest_parms)
2542 goto nla_put_failure;
2543
2544 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2545 goto nla_put_failure;
2546
2547 nat_tuple.src.l3num = nf_ct_l3num(master);
2548 nat_tuple.src.u3 = exp->saved_addr;
2549 nat_tuple.dst.protonum = nf_ct_protonum(master);
2550 nat_tuple.src.u = exp->saved_proto;
2551
2552 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2553 CTA_EXPECT_NAT_TUPLE) < 0)
2554 goto nla_put_failure;
2555 nla_nest_end(skb, nest_parms);
2556 }
2557 #endif
2558 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2559 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2560 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2561 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2562 goto nla_put_failure;
2563 help = nfct_help(master);
2564 if (help) {
2565 struct nf_conntrack_helper *helper;
2566
2567 helper = rcu_dereference(help->helper);
2568 if (helper &&
2569 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2570 goto nla_put_failure;
2571 }
2572 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2573 if (expfn != NULL &&
2574 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2575 goto nla_put_failure;
2576
2577 return 0;
2578
2579 nla_put_failure:
2580 return -1;
2581 }
2582
2583 static int
2584 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2585 int event, const struct nf_conntrack_expect *exp)
2586 {
2587 struct nlmsghdr *nlh;
2588 struct nfgenmsg *nfmsg;
2589 unsigned int flags = portid ? NLM_F_MULTI : 0;
2590
2591 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
2592 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2593 if (nlh == NULL)
2594 goto nlmsg_failure;
2595
2596 nfmsg = nlmsg_data(nlh);
2597 nfmsg->nfgen_family = exp->tuple.src.l3num;
2598 nfmsg->version = NFNETLINK_V0;
2599 nfmsg->res_id = 0;
2600
2601 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2602 goto nla_put_failure;
2603
2604 nlmsg_end(skb, nlh);
2605 return skb->len;
2606
2607 nlmsg_failure:
2608 nla_put_failure:
2609 nlmsg_cancel(skb, nlh);
2610 return -1;
2611 }
2612
2613 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2614 static int
2615 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2616 {
2617 struct nf_conntrack_expect *exp = item->exp;
2618 struct net *net = nf_ct_exp_net(exp);
2619 struct nlmsghdr *nlh;
2620 struct nfgenmsg *nfmsg;
2621 struct sk_buff *skb;
2622 unsigned int type, group;
2623 int flags = 0;
2624
2625 if (events & (1 << IPEXP_DESTROY)) {
2626 type = IPCTNL_MSG_EXP_DELETE;
2627 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2628 } else if (events & (1 << IPEXP_NEW)) {
2629 type = IPCTNL_MSG_EXP_NEW;
2630 flags = NLM_F_CREATE|NLM_F_EXCL;
2631 group = NFNLGRP_CONNTRACK_EXP_NEW;
2632 } else
2633 return 0;
2634
2635 if (!item->report && !nfnetlink_has_listeners(net, group))
2636 return 0;
2637
2638 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2639 if (skb == NULL)
2640 goto errout;
2641
2642 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
2643 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2644 if (nlh == NULL)
2645 goto nlmsg_failure;
2646
2647 nfmsg = nlmsg_data(nlh);
2648 nfmsg->nfgen_family = exp->tuple.src.l3num;
2649 nfmsg->version = NFNETLINK_V0;
2650 nfmsg->res_id = 0;
2651
2652 rcu_read_lock();
2653 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2654 goto nla_put_failure;
2655 rcu_read_unlock();
2656
2657 nlmsg_end(skb, nlh);
2658 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2659 return 0;
2660
2661 nla_put_failure:
2662 rcu_read_unlock();
2663 nlmsg_cancel(skb, nlh);
2664 nlmsg_failure:
2665 kfree_skb(skb);
2666 errout:
2667 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2668 return 0;
2669 }
2670 #endif
2671 static int ctnetlink_exp_done(struct netlink_callback *cb)
2672 {
2673 if (cb->args[1])
2674 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2675 return 0;
2676 }
2677
2678 static int
2679 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2680 {
2681 struct net *net = sock_net(skb->sk);
2682 struct nf_conntrack_expect *exp, *last;
2683 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2684 u_int8_t l3proto = nfmsg->nfgen_family;
2685
2686 rcu_read_lock();
2687 last = (struct nf_conntrack_expect *)cb->args[1];
2688 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2689 restart:
2690 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
2691 hnode) {
2692 if (l3proto && exp->tuple.src.l3num != l3proto)
2693 continue;
2694
2695 if (!net_eq(nf_ct_net(exp->master), net))
2696 continue;
2697
2698 if (cb->args[1]) {
2699 if (exp != last)
2700 continue;
2701 cb->args[1] = 0;
2702 }
2703 if (ctnetlink_exp_fill_info(skb,
2704 NETLINK_CB(cb->skb).portid,
2705 cb->nlh->nlmsg_seq,
2706 IPCTNL_MSG_EXP_NEW,
2707 exp) < 0) {
2708 if (!refcount_inc_not_zero(&exp->use))
2709 continue;
2710 cb->args[1] = (unsigned long)exp;
2711 goto out;
2712 }
2713 }
2714 if (cb->args[1]) {
2715 cb->args[1] = 0;
2716 goto restart;
2717 }
2718 }
2719 out:
2720 rcu_read_unlock();
2721 if (last)
2722 nf_ct_expect_put(last);
2723
2724 return skb->len;
2725 }
2726
2727 static int
2728 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2729 {
2730 struct nf_conntrack_expect *exp, *last;
2731 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2732 struct nf_conn *ct = cb->data;
2733 struct nf_conn_help *help = nfct_help(ct);
2734 u_int8_t l3proto = nfmsg->nfgen_family;
2735
2736 if (cb->args[0])
2737 return 0;
2738
2739 rcu_read_lock();
2740 last = (struct nf_conntrack_expect *)cb->args[1];
2741 restart:
2742 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
2743 if (l3proto && exp->tuple.src.l3num != l3proto)
2744 continue;
2745 if (cb->args[1]) {
2746 if (exp != last)
2747 continue;
2748 cb->args[1] = 0;
2749 }
2750 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2751 cb->nlh->nlmsg_seq,
2752 IPCTNL_MSG_EXP_NEW,
2753 exp) < 0) {
2754 if (!refcount_inc_not_zero(&exp->use))
2755 continue;
2756 cb->args[1] = (unsigned long)exp;
2757 goto out;
2758 }
2759 }
2760 if (cb->args[1]) {
2761 cb->args[1] = 0;
2762 goto restart;
2763 }
2764 cb->args[0] = 1;
2765 out:
2766 rcu_read_unlock();
2767 if (last)
2768 nf_ct_expect_put(last);
2769
2770 return skb->len;
2771 }
2772
2773 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
2774 struct sk_buff *skb,
2775 const struct nlmsghdr *nlh,
2776 const struct nlattr * const cda[])
2777 {
2778 int err;
2779 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2780 u_int8_t u3 = nfmsg->nfgen_family;
2781 struct nf_conntrack_tuple tuple;
2782 struct nf_conntrack_tuple_hash *h;
2783 struct nf_conn *ct;
2784 struct nf_conntrack_zone zone;
2785 struct netlink_dump_control c = {
2786 .dump = ctnetlink_exp_ct_dump_table,
2787 .done = ctnetlink_exp_done,
2788 };
2789
2790 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2791 u3, NULL);
2792 if (err < 0)
2793 return err;
2794
2795 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2796 if (err < 0)
2797 return err;
2798
2799 h = nf_conntrack_find_get(net, &zone, &tuple);
2800 if (!h)
2801 return -ENOENT;
2802
2803 ct = nf_ct_tuplehash_to_ctrack(h);
2804 /* No expectation linked to this connection tracking. */
2805 if (!nfct_help(ct)) {
2806 nf_ct_put(ct);
2807 return 0;
2808 }
2809
2810 c.data = ct;
2811
2812 err = netlink_dump_start(ctnl, skb, nlh, &c);
2813 nf_ct_put(ct);
2814
2815 return err;
2816 }
2817
2818 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
2819 struct sk_buff *skb, const struct nlmsghdr *nlh,
2820 const struct nlattr * const cda[])
2821 {
2822 struct nf_conntrack_tuple tuple;
2823 struct nf_conntrack_expect *exp;
2824 struct sk_buff *skb2;
2825 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2826 u_int8_t u3 = nfmsg->nfgen_family;
2827 struct nf_conntrack_zone zone;
2828 int err;
2829
2830 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2831 if (cda[CTA_EXPECT_MASTER])
2832 return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda);
2833 else {
2834 struct netlink_dump_control c = {
2835 .dump = ctnetlink_exp_dump_table,
2836 .done = ctnetlink_exp_done,
2837 };
2838 return netlink_dump_start(ctnl, skb, nlh, &c);
2839 }
2840 }
2841
2842 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2843 if (err < 0)
2844 return err;
2845
2846 if (cda[CTA_EXPECT_TUPLE])
2847 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2848 u3, NULL);
2849 else if (cda[CTA_EXPECT_MASTER])
2850 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2851 u3, NULL);
2852 else
2853 return -EINVAL;
2854
2855 if (err < 0)
2856 return err;
2857
2858 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2859 if (!exp)
2860 return -ENOENT;
2861
2862 if (cda[CTA_EXPECT_ID]) {
2863 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2864 if (ntohl(id) != (u32)(unsigned long)exp) {
2865 nf_ct_expect_put(exp);
2866 return -ENOENT;
2867 }
2868 }
2869
2870 err = -ENOMEM;
2871 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2872 if (skb2 == NULL) {
2873 nf_ct_expect_put(exp);
2874 goto out;
2875 }
2876
2877 rcu_read_lock();
2878 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2879 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2880 rcu_read_unlock();
2881 nf_ct_expect_put(exp);
2882 if (err <= 0)
2883 goto free;
2884
2885 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2886 if (err < 0)
2887 goto out;
2888
2889 return 0;
2890
2891 free:
2892 kfree_skb(skb2);
2893 out:
2894 /* this avoids a loop in nfnetlink. */
2895 return err == -EAGAIN ? -ENOBUFS : err;
2896 }
2897
2898 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
2899 struct sk_buff *skb, const struct nlmsghdr *nlh,
2900 const struct nlattr * const cda[])
2901 {
2902 struct nf_conntrack_expect *exp;
2903 struct nf_conntrack_tuple tuple;
2904 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2905 struct hlist_node *next;
2906 u_int8_t u3 = nfmsg->nfgen_family;
2907 struct nf_conntrack_zone zone;
2908 unsigned int i;
2909 int err;
2910
2911 if (cda[CTA_EXPECT_TUPLE]) {
2912 /* delete a single expect by tuple */
2913 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2914 if (err < 0)
2915 return err;
2916
2917 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2918 u3, NULL);
2919 if (err < 0)
2920 return err;
2921
2922 /* bump usage count to 2 */
2923 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2924 if (!exp)
2925 return -ENOENT;
2926
2927 if (cda[CTA_EXPECT_ID]) {
2928 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2929 if (ntohl(id) != (u32)(unsigned long)exp) {
2930 nf_ct_expect_put(exp);
2931 return -ENOENT;
2932 }
2933 }
2934
2935 /* after list removal, usage count == 1 */
2936 spin_lock_bh(&nf_conntrack_expect_lock);
2937 if (del_timer(&exp->timeout)) {
2938 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2939 nlmsg_report(nlh));
2940 nf_ct_expect_put(exp);
2941 }
2942 spin_unlock_bh(&nf_conntrack_expect_lock);
2943 /* have to put what we 'get' above.
2944 * after this line usage count == 0 */
2945 nf_ct_expect_put(exp);
2946 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2947 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2948 struct nf_conn_help *m_help;
2949
2950 /* delete all expectations for this helper */
2951 spin_lock_bh(&nf_conntrack_expect_lock);
2952 for (i = 0; i < nf_ct_expect_hsize; i++) {
2953 hlist_for_each_entry_safe(exp, next,
2954 &nf_ct_expect_hash[i],
2955 hnode) {
2956
2957 if (!net_eq(nf_ct_exp_net(exp), net))
2958 continue;
2959
2960 m_help = nfct_help(exp->master);
2961 if (!strcmp(m_help->helper->name, name) &&
2962 del_timer(&exp->timeout)) {
2963 nf_ct_unlink_expect_report(exp,
2964 NETLINK_CB(skb).portid,
2965 nlmsg_report(nlh));
2966 nf_ct_expect_put(exp);
2967 }
2968 }
2969 }
2970 spin_unlock_bh(&nf_conntrack_expect_lock);
2971 } else {
2972 /* This basically means we have to flush everything*/
2973 spin_lock_bh(&nf_conntrack_expect_lock);
2974 for (i = 0; i < nf_ct_expect_hsize; i++) {
2975 hlist_for_each_entry_safe(exp, next,
2976 &nf_ct_expect_hash[i],
2977 hnode) {
2978
2979 if (!net_eq(nf_ct_exp_net(exp), net))
2980 continue;
2981
2982 if (del_timer(&exp->timeout)) {
2983 nf_ct_unlink_expect_report(exp,
2984 NETLINK_CB(skb).portid,
2985 nlmsg_report(nlh));
2986 nf_ct_expect_put(exp);
2987 }
2988 }
2989 }
2990 spin_unlock_bh(&nf_conntrack_expect_lock);
2991 }
2992
2993 return 0;
2994 }
2995 static int
2996 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2997 const struct nlattr * const cda[])
2998 {
2999 if (cda[CTA_EXPECT_TIMEOUT]) {
3000 if (!del_timer(&x->timeout))
3001 return -ETIME;
3002
3003 x->timeout.expires = jiffies +
3004 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3005 add_timer(&x->timeout);
3006 }
3007 return 0;
3008 }
3009
3010 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3011 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3012 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3013 };
3014
3015 static int
3016 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3017 struct nf_conntrack_expect *exp,
3018 u_int8_t u3)
3019 {
3020 #ifdef CONFIG_NF_NAT_NEEDED
3021 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3022 struct nf_conntrack_tuple nat_tuple = {};
3023 int err;
3024
3025 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr,
3026 exp_nat_nla_policy, NULL);
3027 if (err < 0)
3028 return err;
3029
3030 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3031 return -EINVAL;
3032
3033 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3034 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3035 u3, NULL);
3036 if (err < 0)
3037 return err;
3038
3039 exp->saved_addr = nat_tuple.src.u3;
3040 exp->saved_proto = nat_tuple.src.u;
3041 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3042
3043 return 0;
3044 #else
3045 return -EOPNOTSUPP;
3046 #endif
3047 }
3048
3049 static struct nf_conntrack_expect *
3050 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3051 struct nf_conntrack_helper *helper,
3052 struct nf_conntrack_tuple *tuple,
3053 struct nf_conntrack_tuple *mask)
3054 {
3055 u_int32_t class = 0;
3056 struct nf_conntrack_expect *exp;
3057 struct nf_conn_help *help;
3058 int err;
3059
3060 help = nfct_help(ct);
3061 if (!help)
3062 return ERR_PTR(-EOPNOTSUPP);
3063
3064 if (cda[CTA_EXPECT_CLASS] && helper) {
3065 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3066 if (class > helper->expect_class_max)
3067 return ERR_PTR(-EINVAL);
3068 }
3069 exp = nf_ct_expect_alloc(ct);
3070 if (!exp)
3071 return ERR_PTR(-ENOMEM);
3072
3073 if (cda[CTA_EXPECT_FLAGS]) {
3074 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3075 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3076 } else {
3077 exp->flags = 0;
3078 }
3079 if (cda[CTA_EXPECT_FN]) {
3080 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3081 struct nf_ct_helper_expectfn *expfn;
3082
3083 expfn = nf_ct_helper_expectfn_find_by_name(name);
3084 if (expfn == NULL) {
3085 err = -EINVAL;
3086 goto err_out;
3087 }
3088 exp->expectfn = expfn->expectfn;
3089 } else
3090 exp->expectfn = NULL;
3091
3092 exp->class = class;
3093 exp->master = ct;
3094 exp->helper = helper;
3095 exp->tuple = *tuple;
3096 exp->mask.src.u3 = mask->src.u3;
3097 exp->mask.src.u.all = mask->src.u.all;
3098
3099 if (cda[CTA_EXPECT_NAT]) {
3100 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3101 exp, nf_ct_l3num(ct));
3102 if (err < 0)
3103 goto err_out;
3104 }
3105 return exp;
3106 err_out:
3107 nf_ct_expect_put(exp);
3108 return ERR_PTR(err);
3109 }
3110
3111 static int
3112 ctnetlink_create_expect(struct net *net,
3113 const struct nf_conntrack_zone *zone,
3114 const struct nlattr * const cda[],
3115 u_int8_t u3, u32 portid, int report)
3116 {
3117 struct nf_conntrack_tuple tuple, mask, master_tuple;
3118 struct nf_conntrack_tuple_hash *h = NULL;
3119 struct nf_conntrack_helper *helper = NULL;
3120 struct nf_conntrack_expect *exp;
3121 struct nf_conn *ct;
3122 int err;
3123
3124 /* caller guarantees that those three CTA_EXPECT_* exist */
3125 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3126 u3, NULL);
3127 if (err < 0)
3128 return err;
3129 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3130 u3, NULL);
3131 if (err < 0)
3132 return err;
3133 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3134 u3, NULL);
3135 if (err < 0)
3136 return err;
3137
3138 /* Look for master conntrack of this expectation */
3139 h = nf_conntrack_find_get(net, zone, &master_tuple);
3140 if (!h)
3141 return -ENOENT;
3142 ct = nf_ct_tuplehash_to_ctrack(h);
3143
3144 rcu_read_lock();
3145 if (cda[CTA_EXPECT_HELP_NAME]) {
3146 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3147
3148 helper = __nf_conntrack_helper_find(helpname, u3,
3149 nf_ct_protonum(ct));
3150 if (helper == NULL) {
3151 rcu_read_unlock();
3152 #ifdef CONFIG_MODULES
3153 if (request_module("nfct-helper-%s", helpname) < 0) {
3154 err = -EOPNOTSUPP;
3155 goto err_ct;
3156 }
3157 rcu_read_lock();
3158 helper = __nf_conntrack_helper_find(helpname, u3,
3159 nf_ct_protonum(ct));
3160 if (helper) {
3161 err = -EAGAIN;
3162 goto err_rcu;
3163 }
3164 rcu_read_unlock();
3165 #endif
3166 err = -EOPNOTSUPP;
3167 goto err_ct;
3168 }
3169 }
3170
3171 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3172 if (IS_ERR(exp)) {
3173 err = PTR_ERR(exp);
3174 goto err_rcu;
3175 }
3176
3177 err = nf_ct_expect_related_report(exp, portid, report);
3178 nf_ct_expect_put(exp);
3179 err_rcu:
3180 rcu_read_unlock();
3181 err_ct:
3182 nf_ct_put(ct);
3183 return err;
3184 }
3185
3186 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3187 struct sk_buff *skb, const struct nlmsghdr *nlh,
3188 const struct nlattr * const cda[])
3189 {
3190 struct nf_conntrack_tuple tuple;
3191 struct nf_conntrack_expect *exp;
3192 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3193 u_int8_t u3 = nfmsg->nfgen_family;
3194 struct nf_conntrack_zone zone;
3195 int err;
3196
3197 if (!cda[CTA_EXPECT_TUPLE]
3198 || !cda[CTA_EXPECT_MASK]
3199 || !cda[CTA_EXPECT_MASTER])
3200 return -EINVAL;
3201
3202 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3203 if (err < 0)
3204 return err;
3205
3206 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3207 u3, NULL);
3208 if (err < 0)
3209 return err;
3210
3211 spin_lock_bh(&nf_conntrack_expect_lock);
3212 exp = __nf_ct_expect_find(net, &zone, &tuple);
3213 if (!exp) {
3214 spin_unlock_bh(&nf_conntrack_expect_lock);
3215 err = -ENOENT;
3216 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3217 err = ctnetlink_create_expect(net, &zone, cda, u3,
3218 NETLINK_CB(skb).portid,
3219 nlmsg_report(nlh));
3220 }
3221 return err;
3222 }
3223
3224 err = -EEXIST;
3225 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3226 err = ctnetlink_change_expect(exp, cda);
3227 spin_unlock_bh(&nf_conntrack_expect_lock);
3228
3229 return err;
3230 }
3231
3232 static int
3233 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3234 const struct ip_conntrack_stat *st)
3235 {
3236 struct nlmsghdr *nlh;
3237 struct nfgenmsg *nfmsg;
3238 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3239
3240 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3241 IPCTNL_MSG_EXP_GET_STATS_CPU);
3242 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3243 if (nlh == NULL)
3244 goto nlmsg_failure;
3245
3246 nfmsg = nlmsg_data(nlh);
3247 nfmsg->nfgen_family = AF_UNSPEC;
3248 nfmsg->version = NFNETLINK_V0;
3249 nfmsg->res_id = htons(cpu);
3250
3251 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3252 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3253 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3254 goto nla_put_failure;
3255
3256 nlmsg_end(skb, nlh);
3257 return skb->len;
3258
3259 nla_put_failure:
3260 nlmsg_failure:
3261 nlmsg_cancel(skb, nlh);
3262 return -1;
3263 }
3264
3265 static int
3266 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3267 {
3268 int cpu;
3269 struct net *net = sock_net(skb->sk);
3270
3271 if (cb->args[0] == nr_cpu_ids)
3272 return 0;
3273
3274 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3275 const struct ip_conntrack_stat *st;
3276
3277 if (!cpu_possible(cpu))
3278 continue;
3279
3280 st = per_cpu_ptr(net->ct.stat, cpu);
3281 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3282 cb->nlh->nlmsg_seq,
3283 cpu, st) < 0)
3284 break;
3285 }
3286 cb->args[0] = cpu;
3287
3288 return skb->len;
3289 }
3290
3291 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3292 struct sk_buff *skb,
3293 const struct nlmsghdr *nlh,
3294 const struct nlattr * const cda[])
3295 {
3296 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3297 struct netlink_dump_control c = {
3298 .dump = ctnetlink_exp_stat_cpu_dump,
3299 };
3300 return netlink_dump_start(ctnl, skb, nlh, &c);
3301 }
3302
3303 return 0;
3304 }
3305
3306 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3307 static struct nf_ct_event_notifier ctnl_notifier = {
3308 .fcn = ctnetlink_conntrack_event,
3309 };
3310
3311 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3312 .fcn = ctnetlink_expect_event,
3313 };
3314 #endif
3315
3316 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3317 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3318 .attr_count = CTA_MAX,
3319 .policy = ct_nla_policy },
3320 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3321 .attr_count = CTA_MAX,
3322 .policy = ct_nla_policy },
3323 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3324 .attr_count = CTA_MAX,
3325 .policy = ct_nla_policy },
3326 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3327 .attr_count = CTA_MAX,
3328 .policy = ct_nla_policy },
3329 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3330 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3331 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3332 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3333 };
3334
3335 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3336 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3337 .attr_count = CTA_EXPECT_MAX,
3338 .policy = exp_nla_policy },
3339 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3340 .attr_count = CTA_EXPECT_MAX,
3341 .policy = exp_nla_policy },
3342 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3343 .attr_count = CTA_EXPECT_MAX,
3344 .policy = exp_nla_policy },
3345 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3346 };
3347
3348 static const struct nfnetlink_subsystem ctnl_subsys = {
3349 .name = "conntrack",
3350 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3351 .cb_count = IPCTNL_MSG_MAX,
3352 .cb = ctnl_cb,
3353 };
3354
3355 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3356 .name = "conntrack_expect",
3357 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3358 .cb_count = IPCTNL_MSG_EXP_MAX,
3359 .cb = ctnl_exp_cb,
3360 };
3361
3362 MODULE_ALIAS("ip_conntrack_netlink");
3363 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3364 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3365
3366 static int __net_init ctnetlink_net_init(struct net *net)
3367 {
3368 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3369 int ret;
3370
3371 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3372 if (ret < 0) {
3373 pr_err("ctnetlink_init: cannot register notifier.\n");
3374 goto err_out;
3375 }
3376
3377 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3378 if (ret < 0) {
3379 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3380 goto err_unreg_notifier;
3381 }
3382 #endif
3383 return 0;
3384
3385 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3386 err_unreg_notifier:
3387 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3388 err_out:
3389 return ret;
3390 #endif
3391 }
3392
3393 static void ctnetlink_net_exit(struct net *net)
3394 {
3395 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3396 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3397 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3398 #endif
3399 }
3400
3401 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3402 {
3403 struct net *net;
3404
3405 list_for_each_entry(net, net_exit_list, exit_list)
3406 ctnetlink_net_exit(net);
3407 }
3408
3409 static struct pernet_operations ctnetlink_net_ops = {
3410 .init = ctnetlink_net_init,
3411 .exit_batch = ctnetlink_net_exit_batch,
3412 };
3413
3414 static int __init ctnetlink_init(void)
3415 {
3416 int ret;
3417
3418 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3419 ret = nfnetlink_subsys_register(&ctnl_subsys);
3420 if (ret < 0) {
3421 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3422 goto err_out;
3423 }
3424
3425 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3426 if (ret < 0) {
3427 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3428 goto err_unreg_subsys;
3429 }
3430
3431 ret = register_pernet_subsys(&ctnetlink_net_ops);
3432 if (ret < 0) {
3433 pr_err("ctnetlink_init: cannot register pernet operations\n");
3434 goto err_unreg_exp_subsys;
3435 }
3436 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3437 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3438 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3439 #endif
3440 return 0;
3441
3442 err_unreg_exp_subsys:
3443 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3444 err_unreg_subsys:
3445 nfnetlink_subsys_unregister(&ctnl_subsys);
3446 err_out:
3447 return ret;
3448 }
3449
3450 static void __exit ctnetlink_exit(void)
3451 {
3452 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3453
3454 unregister_pernet_subsys(&ctnetlink_net_ops);
3455 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3456 nfnetlink_subsys_unregister(&ctnl_subsys);
3457 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3458 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3459 #endif
3460 synchronize_rcu();
3461 }
3462
3463 module_init(ctnetlink_init);
3464 module_exit(ctnetlink_exit);
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