projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'platform-drivers-x86-v4.3-2' of git://git.infradead.org/users/dvhart/linux...
[deliverable/linux.git] / net / netfilter / nf_conntrack_netlink.c
1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/security.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
32
33 #include <linux/netfilter.h>
34 #include <net/netlink.h>
35 #include <net/sock.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_core.h>
38 #include <net/netfilter/nf_conntrack_expect.h>
39 #include <net/netfilter/nf_conntrack_helper.h>
40 #include <net/netfilter/nf_conntrack_seqadj.h>
41 #include <net/netfilter/nf_conntrack_l3proto.h>
42 #include <net/netfilter/nf_conntrack_l4proto.h>
43 #include <net/netfilter/nf_conntrack_tuple.h>
44 #include <net/netfilter/nf_conntrack_acct.h>
45 #include <net/netfilter/nf_conntrack_zones.h>
46 #include <net/netfilter/nf_conntrack_timestamp.h>
47 #include <net/netfilter/nf_conntrack_labels.h>
48 #ifdef CONFIG_NF_NAT_NEEDED
49 #include <net/netfilter/nf_nat_core.h>
50 #include <net/netfilter/nf_nat_l4proto.h>
51 #include <net/netfilter/nf_nat_helper.h>
52 #endif
53
54 #include <linux/netfilter/nfnetlink.h>
55 #include <linux/netfilter/nfnetlink_conntrack.h>
56
57 MODULE_LICENSE("GPL");
58
59 static char __initdata version[] = "0.93";
60
61 static inline int
62 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
63 const struct nf_conntrack_tuple *tuple,
64 struct nf_conntrack_l4proto *l4proto)
65 {
66 int ret = 0;
67 struct nlattr *nest_parms;
68
69 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
70 if (!nest_parms)
71 goto nla_put_failure;
72 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
73 goto nla_put_failure;
74
75 if (likely(l4proto->tuple_to_nlattr))
76 ret = l4proto->tuple_to_nlattr(skb, tuple);
77
78 nla_nest_end(skb, nest_parms);
79
80 return ret;
81
82 nla_put_failure:
83 return -1;
84 }
85
86 static inline int
87 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
88 const struct nf_conntrack_tuple *tuple,
89 struct nf_conntrack_l3proto *l3proto)
90 {
91 int ret = 0;
92 struct nlattr *nest_parms;
93
94 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
95 if (!nest_parms)
96 goto nla_put_failure;
97
98 if (likely(l3proto->tuple_to_nlattr))
99 ret = l3proto->tuple_to_nlattr(skb, tuple);
100
101 nla_nest_end(skb, nest_parms);
102
103 return ret;
104
105 nla_put_failure:
106 return -1;
107 }
108
109 static int
110 ctnetlink_dump_tuples(struct sk_buff *skb,
111 const struct nf_conntrack_tuple *tuple)
112 {
113 int ret;
114 struct nf_conntrack_l3proto *l3proto;
115 struct nf_conntrack_l4proto *l4proto;
116
117 rcu_read_lock();
118 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
119 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
120
121 if (ret >= 0) {
122 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
123 tuple->dst.protonum);
124 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
125 }
126 rcu_read_unlock();
127 return ret;
128 }
129
130 static inline int
131 ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
132 const struct nf_conntrack_zone *zone, int dir)
133 {
134 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
135 return 0;
136 if (nla_put_be16(skb, attrtype, htons(zone->id)))
137 goto nla_put_failure;
138 return 0;
139
140 nla_put_failure:
141 return -1;
142 }
143
144 static inline int
145 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
146 {
147 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
148 goto nla_put_failure;
149 return 0;
150
151 nla_put_failure:
152 return -1;
153 }
154
155 static inline int
156 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
157 {
158 long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
159
160 if (timeout < 0)
161 timeout = 0;
162
163 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
164 goto nla_put_failure;
165 return 0;
166
167 nla_put_failure:
168 return -1;
169 }
170
171 static inline int
172 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
173 {
174 struct nf_conntrack_l4proto *l4proto;
175 struct nlattr *nest_proto;
176 int ret;
177
178 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
179 if (!l4proto->to_nlattr)
180 return 0;
181
182 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
183 if (!nest_proto)
184 goto nla_put_failure;
185
186 ret = l4proto->to_nlattr(skb, nest_proto, ct);
187
188 nla_nest_end(skb, nest_proto);
189
190 return ret;
191
192 nla_put_failure:
193 return -1;
194 }
195
196 static inline int
197 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
198 {
199 struct nlattr *nest_helper;
200 const struct nf_conn_help *help = nfct_help(ct);
201 struct nf_conntrack_helper *helper;
202
203 if (!help)
204 return 0;
205
206 helper = rcu_dereference(help->helper);
207 if (!helper)
208 goto out;
209
210 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
211 if (!nest_helper)
212 goto nla_put_failure;
213 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
214 goto nla_put_failure;
215
216 if (helper->to_nlattr)
217 helper->to_nlattr(skb, ct);
218
219 nla_nest_end(skb, nest_helper);
220 out:
221 return 0;
222
223 nla_put_failure:
224 return -1;
225 }
226
227 static int
228 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
229 enum ip_conntrack_dir dir, int type)
230 {
231 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
232 struct nf_conn_counter *counter = acct->counter;
233 struct nlattr *nest_count;
234 u64 pkts, bytes;
235
236 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
237 pkts = atomic64_xchg(&counter[dir].packets, 0);
238 bytes = atomic64_xchg(&counter[dir].bytes, 0);
239 } else {
240 pkts = atomic64_read(&counter[dir].packets);
241 bytes = atomic64_read(&counter[dir].bytes);
242 }
243
244 nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
245 if (!nest_count)
246 goto nla_put_failure;
247
248 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts)) ||
249 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes)))
250 goto nla_put_failure;
251
252 nla_nest_end(skb, nest_count);
253
254 return 0;
255
256 nla_put_failure:
257 return -1;
258 }
259
260 static int
261 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
262 {
263 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
264
265 if (!acct)
266 return 0;
267
268 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
269 return -1;
270 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
271 return -1;
272
273 return 0;
274 }
275
276 static int
277 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
278 {
279 struct nlattr *nest_count;
280 const struct nf_conn_tstamp *tstamp;
281
282 tstamp = nf_conn_tstamp_find(ct);
283 if (!tstamp)
284 return 0;
285
286 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
287 if (!nest_count)
288 goto nla_put_failure;
289
290 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start)) ||
291 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
292 cpu_to_be64(tstamp->stop))))
293 goto nla_put_failure;
294 nla_nest_end(skb, nest_count);
295
296 return 0;
297
298 nla_put_failure:
299 return -1;
300 }
301
302 #ifdef CONFIG_NF_CONNTRACK_MARK
303 static inline int
304 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
305 {
306 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
307 goto nla_put_failure;
308 return 0;
309
310 nla_put_failure:
311 return -1;
312 }
313 #else
314 #define ctnetlink_dump_mark(a, b) (0)
315 #endif
316
317 #ifdef CONFIG_NF_CONNTRACK_SECMARK
318 static inline int
319 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
320 {
321 struct nlattr *nest_secctx;
322 int len, ret;
323 char *secctx;
324
325 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
326 if (ret)
327 return 0;
328
329 ret = -1;
330 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
331 if (!nest_secctx)
332 goto nla_put_failure;
333
334 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
335 goto nla_put_failure;
336 nla_nest_end(skb, nest_secctx);
337
338 ret = 0;
339 nla_put_failure:
340 security_release_secctx(secctx, len);
341 return ret;
342 }
343 #else
344 #define ctnetlink_dump_secctx(a, b) (0)
345 #endif
346
347 #ifdef CONFIG_NF_CONNTRACK_LABELS
348 static int ctnetlink_label_size(const struct nf_conn *ct)
349 {
350 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
351
352 if (!labels)
353 return 0;
354 return nla_total_size(labels->words * sizeof(long));
355 }
356
357 static int
358 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
359 {
360 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
361 unsigned int len, i;
362
363 if (!labels)
364 return 0;
365
366 len = labels->words * sizeof(long);
367 i = 0;
368 do {
369 if (labels->bits[i] != 0)
370 return nla_put(skb, CTA_LABELS, len, labels->bits);
371 i++;
372 } while (i < labels->words);
373
374 return 0;
375 }
376 #else
377 #define ctnetlink_dump_labels(a, b) (0)
378 #define ctnetlink_label_size(a) (0)
379 #endif
380
381 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
382
383 static inline int
384 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
385 {
386 struct nlattr *nest_parms;
387
388 if (!(ct->status & IPS_EXPECTED))
389 return 0;
390
391 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
392 if (!nest_parms)
393 goto nla_put_failure;
394 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
395 goto nla_put_failure;
396 nla_nest_end(skb, nest_parms);
397
398 return 0;
399
400 nla_put_failure:
401 return -1;
402 }
403
404 static int
405 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
406 {
407 struct nlattr *nest_parms;
408
409 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
410 if (!nest_parms)
411 goto nla_put_failure;
412
413 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
414 htonl(seq->correction_pos)) ||
415 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
416 htonl(seq->offset_before)) ||
417 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
418 htonl(seq->offset_after)))
419 goto nla_put_failure;
420
421 nla_nest_end(skb, nest_parms);
422
423 return 0;
424
425 nla_put_failure:
426 return -1;
427 }
428
429 static inline int
430 ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
431 {
432 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
433 struct nf_ct_seqadj *seq;
434
435 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
436 return 0;
437
438 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
439 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
440 return -1;
441
442 seq = &seqadj->seq[IP_CT_DIR_REPLY];
443 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
444 return -1;
445
446 return 0;
447 }
448
449 static inline int
450 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
451 {
452 if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
453 goto nla_put_failure;
454 return 0;
455
456 nla_put_failure:
457 return -1;
458 }
459
460 static inline int
461 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
462 {
463 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
464 goto nla_put_failure;
465 return 0;
466
467 nla_put_failure:
468 return -1;
469 }
470
471 static int
472 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
473 struct nf_conn *ct)
474 {
475 const struct nf_conntrack_zone *zone;
476 struct nlmsghdr *nlh;
477 struct nfgenmsg *nfmsg;
478 struct nlattr *nest_parms;
479 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
480
481 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
482 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
483 if (nlh == NULL)
484 goto nlmsg_failure;
485
486 nfmsg = nlmsg_data(nlh);
487 nfmsg->nfgen_family = nf_ct_l3num(ct);
488 nfmsg->version = NFNETLINK_V0;
489 nfmsg->res_id = 0;
490
491 zone = nf_ct_zone(ct);
492
493 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
494 if (!nest_parms)
495 goto nla_put_failure;
496 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
497 goto nla_put_failure;
498 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
499 NF_CT_ZONE_DIR_ORIG) < 0)
500 goto nla_put_failure;
501 nla_nest_end(skb, nest_parms);
502
503 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
504 if (!nest_parms)
505 goto nla_put_failure;
506 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
507 goto nla_put_failure;
508 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
509 NF_CT_ZONE_DIR_REPL) < 0)
510 goto nla_put_failure;
511 nla_nest_end(skb, nest_parms);
512
513 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
514 NF_CT_DEFAULT_ZONE_DIR) < 0)
515 goto nla_put_failure;
516
517 if (ctnetlink_dump_status(skb, ct) < 0 ||
518 ctnetlink_dump_timeout(skb, ct) < 0 ||
519 ctnetlink_dump_acct(skb, ct, type) < 0 ||
520 ctnetlink_dump_timestamp(skb, ct) < 0 ||
521 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
522 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
523 ctnetlink_dump_mark(skb, ct) < 0 ||
524 ctnetlink_dump_secctx(skb, ct) < 0 ||
525 ctnetlink_dump_labels(skb, ct) < 0 ||
526 ctnetlink_dump_id(skb, ct) < 0 ||
527 ctnetlink_dump_use(skb, ct) < 0 ||
528 ctnetlink_dump_master(skb, ct) < 0 ||
529 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
530 goto nla_put_failure;
531
532 nlmsg_end(skb, nlh);
533 return skb->len;
534
535 nlmsg_failure:
536 nla_put_failure:
537 nlmsg_cancel(skb, nlh);
538 return -1;
539 }
540
541 static inline size_t
542 ctnetlink_proto_size(const struct nf_conn *ct)
543 {
544 struct nf_conntrack_l3proto *l3proto;
545 struct nf_conntrack_l4proto *l4proto;
546 size_t len = 0;
547
548 rcu_read_lock();
549 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
550 len += l3proto->nla_size;
551
552 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
553 len += l4proto->nla_size;
554 rcu_read_unlock();
555
556 return len;
557 }
558
559 static inline size_t
560 ctnetlink_acct_size(const struct nf_conn *ct)
561 {
562 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
563 return 0;
564 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
565 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
566 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
567 ;
568 }
569
570 static inline int
571 ctnetlink_secctx_size(const struct nf_conn *ct)
572 {
573 #ifdef CONFIG_NF_CONNTRACK_SECMARK
574 int len, ret;
575
576 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
577 if (ret)
578 return 0;
579
580 return nla_total_size(0) /* CTA_SECCTX */
581 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
582 #else
583 return 0;
584 #endif
585 }
586
587 static inline size_t
588 ctnetlink_timestamp_size(const struct nf_conn *ct)
589 {
590 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
591 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
592 return 0;
593 return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
594 #else
595 return 0;
596 #endif
597 }
598
599 static inline size_t
600 ctnetlink_nlmsg_size(const struct nf_conn *ct)
601 {
602 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
603 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
604 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
605 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
606 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
607 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
608 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
609 + ctnetlink_acct_size(ct)
610 + ctnetlink_timestamp_size(ct)
611 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
612 + nla_total_size(0) /* CTA_PROTOINFO */
613 + nla_total_size(0) /* CTA_HELP */
614 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
615 + ctnetlink_secctx_size(ct)
616 #ifdef CONFIG_NF_NAT_NEEDED
617 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
618 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
619 #endif
620 #ifdef CONFIG_NF_CONNTRACK_MARK
621 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
622 #endif
623 #ifdef CONFIG_NF_CONNTRACK_ZONES
624 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
625 #endif
626 + ctnetlink_proto_size(ct)
627 + ctnetlink_label_size(ct)
628 ;
629 }
630
631 #ifdef CONFIG_NF_CONNTRACK_EVENTS
632 static int
633 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
634 {
635 const struct nf_conntrack_zone *zone;
636 struct net *net;
637 struct nlmsghdr *nlh;
638 struct nfgenmsg *nfmsg;
639 struct nlattr *nest_parms;
640 struct nf_conn *ct = item->ct;
641 struct sk_buff *skb;
642 unsigned int type;
643 unsigned int flags = 0, group;
644 int err;
645
646 /* ignore our fake conntrack entry */
647 if (nf_ct_is_untracked(ct))
648 return 0;
649
650 if (events & (1 << IPCT_DESTROY)) {
651 type = IPCTNL_MSG_CT_DELETE;
652 group = NFNLGRP_CONNTRACK_DESTROY;
653 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
654 type = IPCTNL_MSG_CT_NEW;
655 flags = NLM_F_CREATE|NLM_F_EXCL;
656 group = NFNLGRP_CONNTRACK_NEW;
657 } else if (events) {
658 type = IPCTNL_MSG_CT_NEW;
659 group = NFNLGRP_CONNTRACK_UPDATE;
660 } else
661 return 0;
662
663 net = nf_ct_net(ct);
664 if (!item->report && !nfnetlink_has_listeners(net, group))
665 return 0;
666
667 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
668 if (skb == NULL)
669 goto errout;
670
671 type |= NFNL_SUBSYS_CTNETLINK << 8;
672 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
673 if (nlh == NULL)
674 goto nlmsg_failure;
675
676 nfmsg = nlmsg_data(nlh);
677 nfmsg->nfgen_family = nf_ct_l3num(ct);
678 nfmsg->version = NFNETLINK_V0;
679 nfmsg->res_id = 0;
680
681 rcu_read_lock();
682 zone = nf_ct_zone(ct);
683
684 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
685 if (!nest_parms)
686 goto nla_put_failure;
687 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
688 goto nla_put_failure;
689 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
690 NF_CT_ZONE_DIR_ORIG) < 0)
691 goto nla_put_failure;
692 nla_nest_end(skb, nest_parms);
693
694 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
695 if (!nest_parms)
696 goto nla_put_failure;
697 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
698 goto nla_put_failure;
699 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
700 NF_CT_ZONE_DIR_REPL) < 0)
701 goto nla_put_failure;
702 nla_nest_end(skb, nest_parms);
703
704 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
705 NF_CT_DEFAULT_ZONE_DIR) < 0)
706 goto nla_put_failure;
707
708 if (ctnetlink_dump_id(skb, ct) < 0)
709 goto nla_put_failure;
710
711 if (ctnetlink_dump_status(skb, ct) < 0)
712 goto nla_put_failure;
713
714 if (events & (1 << IPCT_DESTROY)) {
715 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
716 ctnetlink_dump_timestamp(skb, ct) < 0)
717 goto nla_put_failure;
718 } else {
719 if (ctnetlink_dump_timeout(skb, ct) < 0)
720 goto nla_put_failure;
721
722 if (events & (1 << IPCT_PROTOINFO)
723 && ctnetlink_dump_protoinfo(skb, ct) < 0)
724 goto nla_put_failure;
725
726 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
727 && ctnetlink_dump_helpinfo(skb, ct) < 0)
728 goto nla_put_failure;
729
730 #ifdef CONFIG_NF_CONNTRACK_SECMARK
731 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
732 && ctnetlink_dump_secctx(skb, ct) < 0)
733 goto nla_put_failure;
734 #endif
735 if (events & (1 << IPCT_LABEL) &&
736 ctnetlink_dump_labels(skb, ct) < 0)
737 goto nla_put_failure;
738
739 if (events & (1 << IPCT_RELATED) &&
740 ctnetlink_dump_master(skb, ct) < 0)
741 goto nla_put_failure;
742
743 if (events & (1 << IPCT_SEQADJ) &&
744 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
745 goto nla_put_failure;
746 }
747
748 #ifdef CONFIG_NF_CONNTRACK_MARK
749 if ((events & (1 << IPCT_MARK) || ct->mark)
750 && ctnetlink_dump_mark(skb, ct) < 0)
751 goto nla_put_failure;
752 #endif
753 rcu_read_unlock();
754
755 nlmsg_end(skb, nlh);
756 err = nfnetlink_send(skb, net, item->portid, group, item->report,
757 GFP_ATOMIC);
758 if (err == -ENOBUFS || err == -EAGAIN)
759 return -ENOBUFS;
760
761 return 0;
762
763 nla_put_failure:
764 rcu_read_unlock();
765 nlmsg_cancel(skb, nlh);
766 nlmsg_failure:
767 kfree_skb(skb);
768 errout:
769 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
770 return -ENOBUFS;
771
772 return 0;
773 }
774 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
775
776 static int ctnetlink_done(struct netlink_callback *cb)
777 {
778 if (cb->args[1])
779 nf_ct_put((struct nf_conn *)cb->args[1]);
780 kfree(cb->data);
781 return 0;
782 }
783
784 struct ctnetlink_filter {
785 struct {
786 u_int32_t val;
787 u_int32_t mask;
788 } mark;
789 };
790
791 static struct ctnetlink_filter *
792 ctnetlink_alloc_filter(const struct nlattr * const cda[])
793 {
794 #ifdef CONFIG_NF_CONNTRACK_MARK
795 struct ctnetlink_filter *filter;
796
797 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
798 if (filter == NULL)
799 return ERR_PTR(-ENOMEM);
800
801 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
802 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
803
804 return filter;
805 #else
806 return ERR_PTR(-EOPNOTSUPP);
807 #endif
808 }
809
810 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
811 {
812 struct ctnetlink_filter *filter = data;
813
814 if (filter == NULL)
815 return 1;
816
817 #ifdef CONFIG_NF_CONNTRACK_MARK
818 if ((ct->mark & filter->mark.mask) == filter->mark.val)
819 return 1;
820 #endif
821
822 return 0;
823 }
824
825 static int
826 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
827 {
828 struct net *net = sock_net(skb->sk);
829 struct nf_conn *ct, *last;
830 struct nf_conntrack_tuple_hash *h;
831 struct hlist_nulls_node *n;
832 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
833 u_int8_t l3proto = nfmsg->nfgen_family;
834 int res;
835 spinlock_t *lockp;
836
837 last = (struct nf_conn *)cb->args[1];
838
839 local_bh_disable();
840 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
841 restart:
842 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
843 spin_lock(lockp);
844 if (cb->args[0] >= net->ct.htable_size) {
845 spin_unlock(lockp);
846 goto out;
847 }
848 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
849 hnnode) {
850 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
851 continue;
852 ct = nf_ct_tuplehash_to_ctrack(h);
853 /* Dump entries of a given L3 protocol number.
854 * If it is not specified, ie. l3proto == 0,
855 * then dump everything. */
856 if (l3proto && nf_ct_l3num(ct) != l3proto)
857 continue;
858 if (cb->args[1]) {
859 if (ct != last)
860 continue;
861 cb->args[1] = 0;
862 }
863 if (!ctnetlink_filter_match(ct, cb->data))
864 continue;
865
866 rcu_read_lock();
867 res =
868 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
869 cb->nlh->nlmsg_seq,
870 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
871 ct);
872 rcu_read_unlock();
873 if (res < 0) {
874 nf_conntrack_get(&ct->ct_general);
875 cb->args[1] = (unsigned long)ct;
876 spin_unlock(lockp);
877 goto out;
878 }
879 }
880 spin_unlock(lockp);
881 if (cb->args[1]) {
882 cb->args[1] = 0;
883 goto restart;
884 }
885 }
886 out:
887 local_bh_enable();
888 if (last)
889 nf_ct_put(last);
890
891 return skb->len;
892 }
893
894 static inline int
895 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
896 {
897 struct nlattr *tb[CTA_IP_MAX+1];
898 struct nf_conntrack_l3proto *l3proto;
899 int ret = 0;
900
901 ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
902 if (ret < 0)
903 return ret;
904
905 rcu_read_lock();
906 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
907
908 if (likely(l3proto->nlattr_to_tuple)) {
909 ret = nla_validate_nested(attr, CTA_IP_MAX,
910 l3proto->nla_policy);
911 if (ret == 0)
912 ret = l3proto->nlattr_to_tuple(tb, tuple);
913 }
914
915 rcu_read_unlock();
916
917 return ret;
918 }
919
920 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
921 [CTA_PROTO_NUM] = { .type = NLA_U8 },
922 };
923
924 static inline int
925 ctnetlink_parse_tuple_proto(struct nlattr *attr,
926 struct nf_conntrack_tuple *tuple)
927 {
928 struct nlattr *tb[CTA_PROTO_MAX+1];
929 struct nf_conntrack_l4proto *l4proto;
930 int ret = 0;
931
932 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
933 if (ret < 0)
934 return ret;
935
936 if (!tb[CTA_PROTO_NUM])
937 return -EINVAL;
938 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
939
940 rcu_read_lock();
941 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
942
943 if (likely(l4proto->nlattr_to_tuple)) {
944 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
945 l4proto->nla_policy);
946 if (ret == 0)
947 ret = l4proto->nlattr_to_tuple(tb, tuple);
948 }
949
950 rcu_read_unlock();
951
952 return ret;
953 }
954
955 static int
956 ctnetlink_parse_zone(const struct nlattr *attr,
957 struct nf_conntrack_zone *zone)
958 {
959 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
960 NF_CT_DEFAULT_ZONE_DIR, 0);
961 #ifdef CONFIG_NF_CONNTRACK_ZONES
962 if (attr)
963 zone->id = ntohs(nla_get_be16(attr));
964 #else
965 if (attr)
966 return -EOPNOTSUPP;
967 #endif
968 return 0;
969 }
970
971 static int
972 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
973 struct nf_conntrack_zone *zone)
974 {
975 int ret;
976
977 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
978 return -EINVAL;
979
980 ret = ctnetlink_parse_zone(attr, zone);
981 if (ret < 0)
982 return ret;
983
984 if (type == CTA_TUPLE_REPLY)
985 zone->dir = NF_CT_ZONE_DIR_REPL;
986 else
987 zone->dir = NF_CT_ZONE_DIR_ORIG;
988
989 return 0;
990 }
991
992 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
993 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
994 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
995 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
996 };
997
998 static int
999 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1000 struct nf_conntrack_tuple *tuple,
1001 enum ctattr_type type, u_int8_t l3num,
1002 struct nf_conntrack_zone *zone)
1003 {
1004 struct nlattr *tb[CTA_TUPLE_MAX+1];
1005 int err;
1006
1007 memset(tuple, 0, sizeof(*tuple));
1008
1009 err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
1010 if (err < 0)
1011 return err;
1012
1013 if (!tb[CTA_TUPLE_IP])
1014 return -EINVAL;
1015
1016 tuple->src.l3num = l3num;
1017
1018 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
1019 if (err < 0)
1020 return err;
1021
1022 if (!tb[CTA_TUPLE_PROTO])
1023 return -EINVAL;
1024
1025 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
1026 if (err < 0)
1027 return err;
1028
1029 if (tb[CTA_TUPLE_ZONE]) {
1030 if (!zone)
1031 return -EINVAL;
1032
1033 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1034 type, zone);
1035 if (err < 0)
1036 return err;
1037 }
1038
1039 /* orig and expect tuples get DIR_ORIGINAL */
1040 if (type == CTA_TUPLE_REPLY)
1041 tuple->dst.dir = IP_CT_DIR_REPLY;
1042 else
1043 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1044
1045 return 0;
1046 }
1047
1048 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1049 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1050 .len = NF_CT_HELPER_NAME_LEN - 1 },
1051 };
1052
1053 static inline int
1054 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1055 struct nlattr **helpinfo)
1056 {
1057 int err;
1058 struct nlattr *tb[CTA_HELP_MAX+1];
1059
1060 err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
1061 if (err < 0)
1062 return err;
1063
1064 if (!tb[CTA_HELP_NAME])
1065 return -EINVAL;
1066
1067 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1068
1069 if (tb[CTA_HELP_INFO])
1070 *helpinfo = tb[CTA_HELP_INFO];
1071
1072 return 0;
1073 }
1074
1075 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1076 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1077 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1078 [CTA_STATUS] = { .type = NLA_U32 },
1079 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1080 [CTA_HELP] = { .type = NLA_NESTED },
1081 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1082 [CTA_TIMEOUT] = { .type = NLA_U32 },
1083 [CTA_MARK] = { .type = NLA_U32 },
1084 [CTA_ID] = { .type = NLA_U32 },
1085 [CTA_NAT_DST] = { .type = NLA_NESTED },
1086 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1087 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1088 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1089 [CTA_ZONE] = { .type = NLA_U16 },
1090 [CTA_MARK_MASK] = { .type = NLA_U32 },
1091 [CTA_LABELS] = { .type = NLA_BINARY,
1092 .len = NF_CT_LABELS_MAX_SIZE },
1093 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1094 .len = NF_CT_LABELS_MAX_SIZE },
1095 };
1096
1097 static int ctnetlink_flush_conntrack(struct net *net,
1098 const struct nlattr * const cda[],
1099 u32 portid, int report)
1100 {
1101 struct ctnetlink_filter *filter = NULL;
1102
1103 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1104 filter = ctnetlink_alloc_filter(cda);
1105 if (IS_ERR(filter))
1106 return PTR_ERR(filter);
1107 }
1108
1109 nf_ct_iterate_cleanup(net, ctnetlink_filter_match, filter,
1110 portid, report);
1111 kfree(filter);
1112
1113 return 0;
1114 }
1115
1116 static int
1117 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
1118 const struct nlmsghdr *nlh,
1119 const struct nlattr * const cda[])
1120 {
1121 struct net *net = sock_net(ctnl);
1122 struct nf_conntrack_tuple_hash *h;
1123 struct nf_conntrack_tuple tuple;
1124 struct nf_conn *ct;
1125 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1126 u_int8_t u3 = nfmsg->nfgen_family;
1127 struct nf_conntrack_zone zone;
1128 int err;
1129
1130 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1131 if (err < 0)
1132 return err;
1133
1134 if (cda[CTA_TUPLE_ORIG])
1135 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1136 u3, &zone);
1137 else if (cda[CTA_TUPLE_REPLY])
1138 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1139 u3, &zone);
1140 else {
1141 return ctnetlink_flush_conntrack(net, cda,
1142 NETLINK_CB(skb).portid,
1143 nlmsg_report(nlh));
1144 }
1145
1146 if (err < 0)
1147 return err;
1148
1149 h = nf_conntrack_find_get(net, &zone, &tuple);
1150 if (!h)
1151 return -ENOENT;
1152
1153 ct = nf_ct_tuplehash_to_ctrack(h);
1154
1155 if (cda[CTA_ID]) {
1156 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1157 if (id != (u32)(unsigned long)ct) {
1158 nf_ct_put(ct);
1159 return -ENOENT;
1160 }
1161 }
1162
1163 if (del_timer(&ct->timeout))
1164 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1165
1166 nf_ct_put(ct);
1167
1168 return 0;
1169 }
1170
1171 static int
1172 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
1173 const struct nlmsghdr *nlh,
1174 const struct nlattr * const cda[])
1175 {
1176 struct net *net = sock_net(ctnl);
1177 struct nf_conntrack_tuple_hash *h;
1178 struct nf_conntrack_tuple tuple;
1179 struct nf_conn *ct;
1180 struct sk_buff *skb2 = NULL;
1181 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1182 u_int8_t u3 = nfmsg->nfgen_family;
1183 struct nf_conntrack_zone zone;
1184 int err;
1185
1186 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1187 struct netlink_dump_control c = {
1188 .dump = ctnetlink_dump_table,
1189 .done = ctnetlink_done,
1190 };
1191
1192 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1193 struct ctnetlink_filter *filter;
1194
1195 filter = ctnetlink_alloc_filter(cda);
1196 if (IS_ERR(filter))
1197 return PTR_ERR(filter);
1198
1199 c.data = filter;
1200 }
1201 return netlink_dump_start(ctnl, skb, nlh, &c);
1202 }
1203
1204 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1205 if (err < 0)
1206 return err;
1207
1208 if (cda[CTA_TUPLE_ORIG])
1209 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1210 u3, &zone);
1211 else if (cda[CTA_TUPLE_REPLY])
1212 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1213 u3, &zone);
1214 else
1215 return -EINVAL;
1216
1217 if (err < 0)
1218 return err;
1219
1220 h = nf_conntrack_find_get(net, &zone, &tuple);
1221 if (!h)
1222 return -ENOENT;
1223
1224 ct = nf_ct_tuplehash_to_ctrack(h);
1225
1226 err = -ENOMEM;
1227 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1228 if (skb2 == NULL) {
1229 nf_ct_put(ct);
1230 return -ENOMEM;
1231 }
1232
1233 rcu_read_lock();
1234 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1235 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1236 rcu_read_unlock();
1237 nf_ct_put(ct);
1238 if (err <= 0)
1239 goto free;
1240
1241 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1242 if (err < 0)
1243 goto out;
1244
1245 return 0;
1246
1247 free:
1248 kfree_skb(skb2);
1249 out:
1250 /* this avoids a loop in nfnetlink. */
1251 return err == -EAGAIN ? -ENOBUFS : err;
1252 }
1253
1254 static int ctnetlink_done_list(struct netlink_callback *cb)
1255 {
1256 if (cb->args[1])
1257 nf_ct_put((struct nf_conn *)cb->args[1]);
1258 return 0;
1259 }
1260
1261 static int
1262 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1263 {
1264 struct nf_conn *ct, *last;
1265 struct nf_conntrack_tuple_hash *h;
1266 struct hlist_nulls_node *n;
1267 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1268 u_int8_t l3proto = nfmsg->nfgen_family;
1269 int res;
1270 int cpu;
1271 struct hlist_nulls_head *list;
1272 struct net *net = sock_net(skb->sk);
1273
1274 if (cb->args[2])
1275 return 0;
1276
1277 last = (struct nf_conn *)cb->args[1];
1278
1279 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1280 struct ct_pcpu *pcpu;
1281
1282 if (!cpu_possible(cpu))
1283 continue;
1284
1285 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1286 spin_lock_bh(&pcpu->lock);
1287 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1288 restart:
1289 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1290 ct = nf_ct_tuplehash_to_ctrack(h);
1291 if (l3proto && nf_ct_l3num(ct) != l3proto)
1292 continue;
1293 if (cb->args[1]) {
1294 if (ct != last)
1295 continue;
1296 cb->args[1] = 0;
1297 }
1298 rcu_read_lock();
1299 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1300 cb->nlh->nlmsg_seq,
1301 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1302 ct);
1303 rcu_read_unlock();
1304 if (res < 0) {
1305 if (!atomic_inc_not_zero(&ct->ct_general.use))
1306 continue;
1307 cb->args[0] = cpu;
1308 cb->args[1] = (unsigned long)ct;
1309 spin_unlock_bh(&pcpu->lock);
1310 goto out;
1311 }
1312 }
1313 if (cb->args[1]) {
1314 cb->args[1] = 0;
1315 goto restart;
1316 }
1317 spin_unlock_bh(&pcpu->lock);
1318 }
1319 cb->args[2] = 1;
1320 out:
1321 if (last)
1322 nf_ct_put(last);
1323
1324 return skb->len;
1325 }
1326
1327 static int
1328 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1329 {
1330 return ctnetlink_dump_list(skb, cb, true);
1331 }
1332
1333 static int
1334 ctnetlink_get_ct_dying(struct sock *ctnl, struct sk_buff *skb,
1335 const struct nlmsghdr *nlh,
1336 const struct nlattr * const cda[])
1337 {
1338 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1339 struct netlink_dump_control c = {
1340 .dump = ctnetlink_dump_dying,
1341 .done = ctnetlink_done_list,
1342 };
1343 return netlink_dump_start(ctnl, skb, nlh, &c);
1344 }
1345
1346 return -EOPNOTSUPP;
1347 }
1348
1349 static int
1350 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1351 {
1352 return ctnetlink_dump_list(skb, cb, false);
1353 }
1354
1355 static int
1356 ctnetlink_get_ct_unconfirmed(struct sock *ctnl, struct sk_buff *skb,
1357 const struct nlmsghdr *nlh,
1358 const struct nlattr * const cda[])
1359 {
1360 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1361 struct netlink_dump_control c = {
1362 .dump = ctnetlink_dump_unconfirmed,
1363 .done = ctnetlink_done_list,
1364 };
1365 return netlink_dump_start(ctnl, skb, nlh, &c);
1366 }
1367
1368 return -EOPNOTSUPP;
1369 }
1370
1371 #ifdef CONFIG_NF_NAT_NEEDED
1372 static int
1373 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1374 enum nf_nat_manip_type manip,
1375 const struct nlattr *attr)
1376 {
1377 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1378 int err;
1379
1380 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1381 if (!parse_nat_setup) {
1382 #ifdef CONFIG_MODULES
1383 rcu_read_unlock();
1384 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1385 if (request_module("nf-nat") < 0) {
1386 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1387 rcu_read_lock();
1388 return -EOPNOTSUPP;
1389 }
1390 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1391 rcu_read_lock();
1392 if (nfnetlink_parse_nat_setup_hook)
1393 return -EAGAIN;
1394 #endif
1395 return -EOPNOTSUPP;
1396 }
1397
1398 err = parse_nat_setup(ct, manip, attr);
1399 if (err == -EAGAIN) {
1400 #ifdef CONFIG_MODULES
1401 rcu_read_unlock();
1402 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1403 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1404 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1405 rcu_read_lock();
1406 return -EOPNOTSUPP;
1407 }
1408 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1409 rcu_read_lock();
1410 #else
1411 err = -EOPNOTSUPP;
1412 #endif
1413 }
1414 return err;
1415 }
1416 #endif
1417
1418 static int
1419 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1420 {
1421 unsigned long d;
1422 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1423 d = ct->status ^ status;
1424
1425 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1426 /* unchangeable */
1427 return -EBUSY;
1428
1429 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1430 /* SEEN_REPLY bit can only be set */
1431 return -EBUSY;
1432
1433 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1434 /* ASSURED bit can only be set */
1435 return -EBUSY;
1436
1437 /* Be careful here, modifying NAT bits can screw up things,
1438 * so don't let users modify them directly if they don't pass
1439 * nf_nat_range. */
1440 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1441 return 0;
1442 }
1443
1444 static int
1445 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1446 {
1447 #ifdef CONFIG_NF_NAT_NEEDED
1448 int ret;
1449
1450 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1451 return 0;
1452
1453 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1454 cda[CTA_NAT_DST]);
1455 if (ret < 0)
1456 return ret;
1457
1458 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1459 cda[CTA_NAT_SRC]);
1460 return ret;
1461 #else
1462 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1463 return 0;
1464 return -EOPNOTSUPP;
1465 #endif
1466 }
1467
1468 static inline int
1469 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1470 {
1471 struct nf_conntrack_helper *helper;
1472 struct nf_conn_help *help = nfct_help(ct);
1473 char *helpname = NULL;
1474 struct nlattr *helpinfo = NULL;
1475 int err;
1476
1477 /* don't change helper of sibling connections */
1478 if (ct->master)
1479 return -EBUSY;
1480
1481 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1482 if (err < 0)
1483 return err;
1484
1485 if (!strcmp(helpname, "")) {
1486 if (help && help->helper) {
1487 /* we had a helper before ... */
1488 nf_ct_remove_expectations(ct);
1489 RCU_INIT_POINTER(help->helper, NULL);
1490 }
1491
1492 return 0;
1493 }
1494
1495 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1496 nf_ct_protonum(ct));
1497 if (helper == NULL) {
1498 #ifdef CONFIG_MODULES
1499 spin_unlock_bh(&nf_conntrack_expect_lock);
1500
1501 if (request_module("nfct-helper-%s", helpname) < 0) {
1502 spin_lock_bh(&nf_conntrack_expect_lock);
1503 return -EOPNOTSUPP;
1504 }
1505
1506 spin_lock_bh(&nf_conntrack_expect_lock);
1507 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1508 nf_ct_protonum(ct));
1509 if (helper)
1510 return -EAGAIN;
1511 #endif
1512 return -EOPNOTSUPP;
1513 }
1514
1515 if (help) {
1516 if (help->helper == helper) {
1517 /* update private helper data if allowed. */
1518 if (helper->from_nlattr)
1519 helper->from_nlattr(helpinfo, ct);
1520 return 0;
1521 } else
1522 return -EBUSY;
1523 }
1524
1525 /* we cannot set a helper for an existing conntrack */
1526 return -EOPNOTSUPP;
1527 }
1528
1529 static inline int
1530 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1531 {
1532 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1533
1534 if (!del_timer(&ct->timeout))
1535 return -ETIME;
1536
1537 ct->timeout.expires = jiffies + timeout * HZ;
1538 add_timer(&ct->timeout);
1539
1540 return 0;
1541 }
1542
1543 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1544 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1545 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1546 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1547 };
1548
1549 static inline int
1550 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1551 {
1552 const struct nlattr *attr = cda[CTA_PROTOINFO];
1553 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1554 struct nf_conntrack_l4proto *l4proto;
1555 int err = 0;
1556
1557 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1558 if (err < 0)
1559 return err;
1560
1561 rcu_read_lock();
1562 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1563 if (l4proto->from_nlattr)
1564 err = l4proto->from_nlattr(tb, ct);
1565 rcu_read_unlock();
1566
1567 return err;
1568 }
1569
1570 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1571 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1572 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1573 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1574 };
1575
1576 static inline int
1577 change_seq_adj(struct nf_ct_seqadj *seq, const struct nlattr * const attr)
1578 {
1579 int err;
1580 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1581
1582 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1583 if (err < 0)
1584 return err;
1585
1586 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1587 return -EINVAL;
1588
1589 seq->correction_pos =
1590 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1591
1592 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1593 return -EINVAL;
1594
1595 seq->offset_before =
1596 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1597
1598 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1599 return -EINVAL;
1600
1601 seq->offset_after =
1602 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1603
1604 return 0;
1605 }
1606
1607 static int
1608 ctnetlink_change_seq_adj(struct nf_conn *ct,
1609 const struct nlattr * const cda[])
1610 {
1611 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1612 int ret = 0;
1613
1614 if (!seqadj)
1615 return 0;
1616
1617 if (cda[CTA_SEQ_ADJ_ORIG]) {
1618 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1619 cda[CTA_SEQ_ADJ_ORIG]);
1620 if (ret < 0)
1621 return ret;
1622
1623 ct->status |= IPS_SEQ_ADJUST;
1624 }
1625
1626 if (cda[CTA_SEQ_ADJ_REPLY]) {
1627 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1628 cda[CTA_SEQ_ADJ_REPLY]);
1629 if (ret < 0)
1630 return ret;
1631
1632 ct->status |= IPS_SEQ_ADJUST;
1633 }
1634
1635 return 0;
1636 }
1637
1638 static int
1639 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1640 {
1641 #ifdef CONFIG_NF_CONNTRACK_LABELS
1642 size_t len = nla_len(cda[CTA_LABELS]);
1643 const void *mask = cda[CTA_LABELS_MASK];
1644
1645 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1646 return -EINVAL;
1647
1648 if (mask) {
1649 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1650 nla_len(cda[CTA_LABELS_MASK]) != len)
1651 return -EINVAL;
1652 mask = nla_data(cda[CTA_LABELS_MASK]);
1653 }
1654
1655 len /= sizeof(u32);
1656
1657 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1658 #else
1659 return -EOPNOTSUPP;
1660 #endif
1661 }
1662
1663 static int
1664 ctnetlink_change_conntrack(struct nf_conn *ct,
1665 const struct nlattr * const cda[])
1666 {
1667 int err;
1668
1669 /* only allow NAT changes and master assignation for new conntracks */
1670 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1671 return -EOPNOTSUPP;
1672
1673 if (cda[CTA_HELP]) {
1674 err = ctnetlink_change_helper(ct, cda);
1675 if (err < 0)
1676 return err;
1677 }
1678
1679 if (cda[CTA_TIMEOUT]) {
1680 err = ctnetlink_change_timeout(ct, cda);
1681 if (err < 0)
1682 return err;
1683 }
1684
1685 if (cda[CTA_STATUS]) {
1686 err = ctnetlink_change_status(ct, cda);
1687 if (err < 0)
1688 return err;
1689 }
1690
1691 if (cda[CTA_PROTOINFO]) {
1692 err = ctnetlink_change_protoinfo(ct, cda);
1693 if (err < 0)
1694 return err;
1695 }
1696
1697 #if defined(CONFIG_NF_CONNTRACK_MARK)
1698 if (cda[CTA_MARK])
1699 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1700 #endif
1701
1702 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1703 err = ctnetlink_change_seq_adj(ct, cda);
1704 if (err < 0)
1705 return err;
1706 }
1707
1708 if (cda[CTA_LABELS]) {
1709 err = ctnetlink_attach_labels(ct, cda);
1710 if (err < 0)
1711 return err;
1712 }
1713
1714 return 0;
1715 }
1716
1717 static struct nf_conn *
1718 ctnetlink_create_conntrack(struct net *net,
1719 const struct nf_conntrack_zone *zone,
1720 const struct nlattr * const cda[],
1721 struct nf_conntrack_tuple *otuple,
1722 struct nf_conntrack_tuple *rtuple,
1723 u8 u3)
1724 {
1725 struct nf_conn *ct;
1726 int err = -EINVAL;
1727 struct nf_conntrack_helper *helper;
1728 struct nf_conn_tstamp *tstamp;
1729
1730 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1731 if (IS_ERR(ct))
1732 return ERR_PTR(-ENOMEM);
1733
1734 if (!cda[CTA_TIMEOUT])
1735 goto err1;
1736 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1737
1738 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1739
1740 rcu_read_lock();
1741 if (cda[CTA_HELP]) {
1742 char *helpname = NULL;
1743 struct nlattr *helpinfo = NULL;
1744
1745 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1746 if (err < 0)
1747 goto err2;
1748
1749 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1750 nf_ct_protonum(ct));
1751 if (helper == NULL) {
1752 rcu_read_unlock();
1753 #ifdef CONFIG_MODULES
1754 if (request_module("nfct-helper-%s", helpname) < 0) {
1755 err = -EOPNOTSUPP;
1756 goto err1;
1757 }
1758
1759 rcu_read_lock();
1760 helper = __nf_conntrack_helper_find(helpname,
1761 nf_ct_l3num(ct),
1762 nf_ct_protonum(ct));
1763 if (helper) {
1764 err = -EAGAIN;
1765 goto err2;
1766 }
1767 rcu_read_unlock();
1768 #endif
1769 err = -EOPNOTSUPP;
1770 goto err1;
1771 } else {
1772 struct nf_conn_help *help;
1773
1774 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1775 if (help == NULL) {
1776 err = -ENOMEM;
1777 goto err2;
1778 }
1779 /* set private helper data if allowed. */
1780 if (helper->from_nlattr)
1781 helper->from_nlattr(helpinfo, ct);
1782
1783 /* not in hash table yet so not strictly necessary */
1784 RCU_INIT_POINTER(help->helper, helper);
1785 }
1786 } else {
1787 /* try an implicit helper assignation */
1788 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1789 if (err < 0)
1790 goto err2;
1791 }
1792
1793 err = ctnetlink_setup_nat(ct, cda);
1794 if (err < 0)
1795 goto err2;
1796
1797 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1798 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1799 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1800 nf_ct_labels_ext_add(ct);
1801
1802 /* we must add conntrack extensions before confirmation. */
1803 ct->status |= IPS_CONFIRMED;
1804
1805 if (cda[CTA_STATUS]) {
1806 err = ctnetlink_change_status(ct, cda);
1807 if (err < 0)
1808 goto err2;
1809 }
1810
1811 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1812 err = ctnetlink_change_seq_adj(ct, cda);
1813 if (err < 0)
1814 goto err2;
1815 }
1816
1817 memset(&ct->proto, 0, sizeof(ct->proto));
1818 if (cda[CTA_PROTOINFO]) {
1819 err = ctnetlink_change_protoinfo(ct, cda);
1820 if (err < 0)
1821 goto err2;
1822 }
1823
1824 #if defined(CONFIG_NF_CONNTRACK_MARK)
1825 if (cda[CTA_MARK])
1826 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1827 #endif
1828
1829 /* setup master conntrack: this is a confirmed expectation */
1830 if (cda[CTA_TUPLE_MASTER]) {
1831 struct nf_conntrack_tuple master;
1832 struct nf_conntrack_tuple_hash *master_h;
1833 struct nf_conn *master_ct;
1834
1835 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
1836 u3, NULL);
1837 if (err < 0)
1838 goto err2;
1839
1840 master_h = nf_conntrack_find_get(net, zone, &master);
1841 if (master_h == NULL) {
1842 err = -ENOENT;
1843 goto err2;
1844 }
1845 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1846 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1847 ct->master = master_ct;
1848 }
1849 tstamp = nf_conn_tstamp_find(ct);
1850 if (tstamp)
1851 tstamp->start = ktime_get_real_ns();
1852
1853 err = nf_conntrack_hash_check_insert(ct);
1854 if (err < 0)
1855 goto err2;
1856
1857 rcu_read_unlock();
1858
1859 return ct;
1860
1861 err2:
1862 rcu_read_unlock();
1863 err1:
1864 nf_conntrack_free(ct);
1865 return ERR_PTR(err);
1866 }
1867
1868 static int
1869 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1870 const struct nlmsghdr *nlh,
1871 const struct nlattr * const cda[])
1872 {
1873 struct net *net = sock_net(ctnl);
1874 struct nf_conntrack_tuple otuple, rtuple;
1875 struct nf_conntrack_tuple_hash *h = NULL;
1876 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1877 struct nf_conn *ct;
1878 u_int8_t u3 = nfmsg->nfgen_family;
1879 struct nf_conntrack_zone zone;
1880 int err;
1881
1882 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1883 if (err < 0)
1884 return err;
1885
1886 if (cda[CTA_TUPLE_ORIG]) {
1887 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
1888 u3, &zone);
1889 if (err < 0)
1890 return err;
1891 }
1892
1893 if (cda[CTA_TUPLE_REPLY]) {
1894 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
1895 u3, &zone);
1896 if (err < 0)
1897 return err;
1898 }
1899
1900 if (cda[CTA_TUPLE_ORIG])
1901 h = nf_conntrack_find_get(net, &zone, &otuple);
1902 else if (cda[CTA_TUPLE_REPLY])
1903 h = nf_conntrack_find_get(net, &zone, &rtuple);
1904
1905 if (h == NULL) {
1906 err = -ENOENT;
1907 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1908 enum ip_conntrack_events events;
1909
1910 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1911 return -EINVAL;
1912
1913 ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
1914 &rtuple, u3);
1915 if (IS_ERR(ct))
1916 return PTR_ERR(ct);
1917
1918 err = 0;
1919 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1920 events = IPCT_RELATED;
1921 else
1922 events = IPCT_NEW;
1923
1924 if (cda[CTA_LABELS] &&
1925 ctnetlink_attach_labels(ct, cda) == 0)
1926 events |= (1 << IPCT_LABEL);
1927
1928 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1929 (1 << IPCT_ASSURED) |
1930 (1 << IPCT_HELPER) |
1931 (1 << IPCT_PROTOINFO) |
1932 (1 << IPCT_SEQADJ) |
1933 (1 << IPCT_MARK) | events,
1934 ct, NETLINK_CB(skb).portid,
1935 nlmsg_report(nlh));
1936 nf_ct_put(ct);
1937 }
1938
1939 return err;
1940 }
1941 /* implicit 'else' */
1942
1943 err = -EEXIST;
1944 ct = nf_ct_tuplehash_to_ctrack(h);
1945 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1946 spin_lock_bh(&nf_conntrack_expect_lock);
1947 err = ctnetlink_change_conntrack(ct, cda);
1948 spin_unlock_bh(&nf_conntrack_expect_lock);
1949 if (err == 0) {
1950 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1951 (1 << IPCT_ASSURED) |
1952 (1 << IPCT_HELPER) |
1953 (1 << IPCT_LABEL) |
1954 (1 << IPCT_PROTOINFO) |
1955 (1 << IPCT_SEQADJ) |
1956 (1 << IPCT_MARK),
1957 ct, NETLINK_CB(skb).portid,
1958 nlmsg_report(nlh));
1959 }
1960 }
1961
1962 nf_ct_put(ct);
1963 return err;
1964 }
1965
1966 static int
1967 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1968 __u16 cpu, const struct ip_conntrack_stat *st)
1969 {
1970 struct nlmsghdr *nlh;
1971 struct nfgenmsg *nfmsg;
1972 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1973
1974 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1975 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1976 if (nlh == NULL)
1977 goto nlmsg_failure;
1978
1979 nfmsg = nlmsg_data(nlh);
1980 nfmsg->nfgen_family = AF_UNSPEC;
1981 nfmsg->version = NFNETLINK_V0;
1982 nfmsg->res_id = htons(cpu);
1983
1984 if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1985 nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1986 nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
1987 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1988 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1989 nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
1990 nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
1991 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1992 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1993 htonl(st->insert_failed)) ||
1994 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1995 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1996 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1997 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1998 htonl(st->search_restart)))
1999 goto nla_put_failure;
2000
2001 nlmsg_end(skb, nlh);
2002 return skb->len;
2003
2004 nla_put_failure:
2005 nlmsg_failure:
2006 nlmsg_cancel(skb, nlh);
2007 return -1;
2008 }
2009
2010 static int
2011 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2012 {
2013 int cpu;
2014 struct net *net = sock_net(skb->sk);
2015
2016 if (cb->args[0] == nr_cpu_ids)
2017 return 0;
2018
2019 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2020 const struct ip_conntrack_stat *st;
2021
2022 if (!cpu_possible(cpu))
2023 continue;
2024
2025 st = per_cpu_ptr(net->ct.stat, cpu);
2026 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2027 NETLINK_CB(cb->skb).portid,
2028 cb->nlh->nlmsg_seq,
2029 cpu, st) < 0)
2030 break;
2031 }
2032 cb->args[0] = cpu;
2033
2034 return skb->len;
2035 }
2036
2037 static int
2038 ctnetlink_stat_ct_cpu(struct sock *ctnl, struct sk_buff *skb,
2039 const struct nlmsghdr *nlh,
2040 const struct nlattr * const cda[])
2041 {
2042 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2043 struct netlink_dump_control c = {
2044 .dump = ctnetlink_ct_stat_cpu_dump,
2045 };
2046 return netlink_dump_start(ctnl, skb, nlh, &c);
2047 }
2048
2049 return 0;
2050 }
2051
2052 static int
2053 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2054 struct net *net)
2055 {
2056 struct nlmsghdr *nlh;
2057 struct nfgenmsg *nfmsg;
2058 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2059 unsigned int nr_conntracks = atomic_read(&net->ct.count);
2060
2061 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
2062 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2063 if (nlh == NULL)
2064 goto nlmsg_failure;
2065
2066 nfmsg = nlmsg_data(nlh);
2067 nfmsg->nfgen_family = AF_UNSPEC;
2068 nfmsg->version = NFNETLINK_V0;
2069 nfmsg->res_id = 0;
2070
2071 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2072 goto nla_put_failure;
2073
2074 nlmsg_end(skb, nlh);
2075 return skb->len;
2076
2077 nla_put_failure:
2078 nlmsg_failure:
2079 nlmsg_cancel(skb, nlh);
2080 return -1;
2081 }
2082
2083 static int
2084 ctnetlink_stat_ct(struct sock *ctnl, struct sk_buff *skb,
2085 const struct nlmsghdr *nlh,
2086 const struct nlattr * const cda[])
2087 {
2088 struct sk_buff *skb2;
2089 int err;
2090
2091 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2092 if (skb2 == NULL)
2093 return -ENOMEM;
2094
2095 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2096 nlh->nlmsg_seq,
2097 NFNL_MSG_TYPE(nlh->nlmsg_type),
2098 sock_net(skb->sk));
2099 if (err <= 0)
2100 goto free;
2101
2102 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2103 if (err < 0)
2104 goto out;
2105
2106 return 0;
2107
2108 free:
2109 kfree_skb(skb2);
2110 out:
2111 /* this avoids a loop in nfnetlink. */
2112 return err == -EAGAIN ? -ENOBUFS : err;
2113 }
2114
2115 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2116 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2117 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2118 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2119 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2120 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2121 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2122 .len = NF_CT_HELPER_NAME_LEN - 1 },
2123 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2124 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2125 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2126 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2127 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2128 };
2129
2130 static struct nf_conntrack_expect *
2131 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2132 struct nf_conntrack_helper *helper,
2133 struct nf_conntrack_tuple *tuple,
2134 struct nf_conntrack_tuple *mask);
2135
2136 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
2137 static size_t
2138 ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
2139 {
2140 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2141 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2142 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2143 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2144 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2145 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2146 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2147 + nla_total_size(0) /* CTA_PROTOINFO */
2148 + nla_total_size(0) /* CTA_HELP */
2149 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2150 + ctnetlink_secctx_size(ct)
2151 #ifdef CONFIG_NF_NAT_NEEDED
2152 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2153 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2154 #endif
2155 #ifdef CONFIG_NF_CONNTRACK_MARK
2156 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2157 #endif
2158 #ifdef CONFIG_NF_CONNTRACK_ZONES
2159 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2160 #endif
2161 + ctnetlink_proto_size(ct)
2162 ;
2163 }
2164
2165 static int
2166 ctnetlink_nfqueue_build(struct sk_buff *skb, struct nf_conn *ct)
2167 {
2168 const struct nf_conntrack_zone *zone;
2169 struct nlattr *nest_parms;
2170
2171 rcu_read_lock();
2172 zone = nf_ct_zone(ct);
2173
2174 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2175 if (!nest_parms)
2176 goto nla_put_failure;
2177 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2178 goto nla_put_failure;
2179 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2180 NF_CT_ZONE_DIR_ORIG) < 0)
2181 goto nla_put_failure;
2182 nla_nest_end(skb, nest_parms);
2183
2184 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2185 if (!nest_parms)
2186 goto nla_put_failure;
2187 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2188 goto nla_put_failure;
2189 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2190 NF_CT_ZONE_DIR_REPL) < 0)
2191 goto nla_put_failure;
2192 nla_nest_end(skb, nest_parms);
2193
2194 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2195 NF_CT_DEFAULT_ZONE_DIR) < 0)
2196 goto nla_put_failure;
2197
2198 if (ctnetlink_dump_id(skb, ct) < 0)
2199 goto nla_put_failure;
2200
2201 if (ctnetlink_dump_status(skb, ct) < 0)
2202 goto nla_put_failure;
2203
2204 if (ctnetlink_dump_timeout(skb, ct) < 0)
2205 goto nla_put_failure;
2206
2207 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2208 goto nla_put_failure;
2209
2210 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2211 goto nla_put_failure;
2212
2213 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2214 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2215 goto nla_put_failure;
2216 #endif
2217 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2218 goto nla_put_failure;
2219
2220 if ((ct->status & IPS_SEQ_ADJUST) &&
2221 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2222 goto nla_put_failure;
2223
2224 #ifdef CONFIG_NF_CONNTRACK_MARK
2225 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2226 goto nla_put_failure;
2227 #endif
2228 if (ctnetlink_dump_labels(skb, ct) < 0)
2229 goto nla_put_failure;
2230 rcu_read_unlock();
2231 return 0;
2232
2233 nla_put_failure:
2234 rcu_read_unlock();
2235 return -ENOSPC;
2236 }
2237
2238 static int
2239 ctnetlink_nfqueue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2240 {
2241 int err;
2242
2243 if (cda[CTA_TIMEOUT]) {
2244 err = ctnetlink_change_timeout(ct, cda);
2245 if (err < 0)
2246 return err;
2247 }
2248 if (cda[CTA_STATUS]) {
2249 err = ctnetlink_change_status(ct, cda);
2250 if (err < 0)
2251 return err;
2252 }
2253 if (cda[CTA_HELP]) {
2254 err = ctnetlink_change_helper(ct, cda);
2255 if (err < 0)
2256 return err;
2257 }
2258 if (cda[CTA_LABELS]) {
2259 err = ctnetlink_attach_labels(ct, cda);
2260 if (err < 0)
2261 return err;
2262 }
2263 #if defined(CONFIG_NF_CONNTRACK_MARK)
2264 if (cda[CTA_MARK]) {
2265 u32 mask = 0, mark, newmark;
2266 if (cda[CTA_MARK_MASK])
2267 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2268
2269 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2270 newmark = (ct->mark & mask) ^ mark;
2271 if (newmark != ct->mark)
2272 ct->mark = newmark;
2273 }
2274 #endif
2275 return 0;
2276 }
2277
2278 static int
2279 ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
2280 {
2281 struct nlattr *cda[CTA_MAX+1];
2282 int ret;
2283
2284 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2285 if (ret < 0)
2286 return ret;
2287
2288 spin_lock_bh(&nf_conntrack_expect_lock);
2289 ret = ctnetlink_nfqueue_parse_ct((const struct nlattr **)cda, ct);
2290 spin_unlock_bh(&nf_conntrack_expect_lock);
2291
2292 return ret;
2293 }
2294
2295 static int ctnetlink_nfqueue_exp_parse(const struct nlattr * const *cda,
2296 const struct nf_conn *ct,
2297 struct nf_conntrack_tuple *tuple,
2298 struct nf_conntrack_tuple *mask)
2299 {
2300 int err;
2301
2302 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2303 nf_ct_l3num(ct), NULL);
2304 if (err < 0)
2305 return err;
2306
2307 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2308 nf_ct_l3num(ct), NULL);
2309 }
2310
2311 static int
2312 ctnetlink_nfqueue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2313 u32 portid, u32 report)
2314 {
2315 struct nlattr *cda[CTA_EXPECT_MAX+1];
2316 struct nf_conntrack_tuple tuple, mask;
2317 struct nf_conntrack_helper *helper = NULL;
2318 struct nf_conntrack_expect *exp;
2319 int err;
2320
2321 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2322 if (err < 0)
2323 return err;
2324
2325 err = ctnetlink_nfqueue_exp_parse((const struct nlattr * const *)cda,
2326 ct, &tuple, &mask);
2327 if (err < 0)
2328 return err;
2329
2330 if (cda[CTA_EXPECT_HELP_NAME]) {
2331 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2332
2333 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2334 nf_ct_protonum(ct));
2335 if (helper == NULL)
2336 return -EOPNOTSUPP;
2337 }
2338
2339 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2340 helper, &tuple, &mask);
2341 if (IS_ERR(exp))
2342 return PTR_ERR(exp);
2343
2344 err = nf_ct_expect_related_report(exp, portid, report);
2345 if (err < 0) {
2346 nf_ct_expect_put(exp);
2347 return err;
2348 }
2349
2350 return 0;
2351 }
2352
2353 static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
2354 .build_size = ctnetlink_nfqueue_build_size,
2355 .build = ctnetlink_nfqueue_build,
2356 .parse = ctnetlink_nfqueue_parse,
2357 .attach_expect = ctnetlink_nfqueue_attach_expect,
2358 .seq_adjust = nf_ct_tcp_seqadj_set,
2359 };
2360 #endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
2361
2362 /***********************************************************************
2363 * EXPECT
2364 ***********************************************************************/
2365
2366 static inline int
2367 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2368 const struct nf_conntrack_tuple *tuple,
2369 enum ctattr_expect type)
2370 {
2371 struct nlattr *nest_parms;
2372
2373 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2374 if (!nest_parms)
2375 goto nla_put_failure;
2376 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2377 goto nla_put_failure;
2378 nla_nest_end(skb, nest_parms);
2379
2380 return 0;
2381
2382 nla_put_failure:
2383 return -1;
2384 }
2385
2386 static inline int
2387 ctnetlink_exp_dump_mask(struct sk_buff *skb,
2388 const struct nf_conntrack_tuple *tuple,
2389 const struct nf_conntrack_tuple_mask *mask)
2390 {
2391 int ret;
2392 struct nf_conntrack_l3proto *l3proto;
2393 struct nf_conntrack_l4proto *l4proto;
2394 struct nf_conntrack_tuple m;
2395 struct nlattr *nest_parms;
2396
2397 memset(&m, 0xFF, sizeof(m));
2398 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2399 m.src.u.all = mask->src.u.all;
2400 m.dst.protonum = tuple->dst.protonum;
2401
2402 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2403 if (!nest_parms)
2404 goto nla_put_failure;
2405
2406 rcu_read_lock();
2407 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2408 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2409 if (ret >= 0) {
2410 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2411 tuple->dst.protonum);
2412 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2413 }
2414 rcu_read_unlock();
2415
2416 if (unlikely(ret < 0))
2417 goto nla_put_failure;
2418
2419 nla_nest_end(skb, nest_parms);
2420
2421 return 0;
2422
2423 nla_put_failure:
2424 return -1;
2425 }
2426
2427 static const union nf_inet_addr any_addr;
2428
2429 static int
2430 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2431 const struct nf_conntrack_expect *exp)
2432 {
2433 struct nf_conn *master = exp->master;
2434 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2435 struct nf_conn_help *help;
2436 #ifdef CONFIG_NF_NAT_NEEDED
2437 struct nlattr *nest_parms;
2438 struct nf_conntrack_tuple nat_tuple = {};
2439 #endif
2440 struct nf_ct_helper_expectfn *expfn;
2441
2442 if (timeout < 0)
2443 timeout = 0;
2444
2445 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2446 goto nla_put_failure;
2447 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2448 goto nla_put_failure;
2449 if (ctnetlink_exp_dump_tuple(skb,
2450 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2451 CTA_EXPECT_MASTER) < 0)
2452 goto nla_put_failure;
2453
2454 #ifdef CONFIG_NF_NAT_NEEDED
2455 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2456 exp->saved_proto.all) {
2457 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2458 if (!nest_parms)
2459 goto nla_put_failure;
2460
2461 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2462 goto nla_put_failure;
2463
2464 nat_tuple.src.l3num = nf_ct_l3num(master);
2465 nat_tuple.src.u3 = exp->saved_addr;
2466 nat_tuple.dst.protonum = nf_ct_protonum(master);
2467 nat_tuple.src.u = exp->saved_proto;
2468
2469 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2470 CTA_EXPECT_NAT_TUPLE) < 0)
2471 goto nla_put_failure;
2472 nla_nest_end(skb, nest_parms);
2473 }
2474 #endif
2475 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2476 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2477 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2478 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2479 goto nla_put_failure;
2480 help = nfct_help(master);
2481 if (help) {
2482 struct nf_conntrack_helper *helper;
2483
2484 helper = rcu_dereference(help->helper);
2485 if (helper &&
2486 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2487 goto nla_put_failure;
2488 }
2489 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2490 if (expfn != NULL &&
2491 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2492 goto nla_put_failure;
2493
2494 return 0;
2495
2496 nla_put_failure:
2497 return -1;
2498 }
2499
2500 static int
2501 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2502 int event, const struct nf_conntrack_expect *exp)
2503 {
2504 struct nlmsghdr *nlh;
2505 struct nfgenmsg *nfmsg;
2506 unsigned int flags = portid ? NLM_F_MULTI : 0;
2507
2508 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2509 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2510 if (nlh == NULL)
2511 goto nlmsg_failure;
2512
2513 nfmsg = nlmsg_data(nlh);
2514 nfmsg->nfgen_family = exp->tuple.src.l3num;
2515 nfmsg->version = NFNETLINK_V0;
2516 nfmsg->res_id = 0;
2517
2518 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2519 goto nla_put_failure;
2520
2521 nlmsg_end(skb, nlh);
2522 return skb->len;
2523
2524 nlmsg_failure:
2525 nla_put_failure:
2526 nlmsg_cancel(skb, nlh);
2527 return -1;
2528 }
2529
2530 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2531 static int
2532 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2533 {
2534 struct nf_conntrack_expect *exp = item->exp;
2535 struct net *net = nf_ct_exp_net(exp);
2536 struct nlmsghdr *nlh;
2537 struct nfgenmsg *nfmsg;
2538 struct sk_buff *skb;
2539 unsigned int type, group;
2540 int flags = 0;
2541
2542 if (events & (1 << IPEXP_DESTROY)) {
2543 type = IPCTNL_MSG_EXP_DELETE;
2544 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2545 } else if (events & (1 << IPEXP_NEW)) {
2546 type = IPCTNL_MSG_EXP_NEW;
2547 flags = NLM_F_CREATE|NLM_F_EXCL;
2548 group = NFNLGRP_CONNTRACK_EXP_NEW;
2549 } else
2550 return 0;
2551
2552 if (!item->report && !nfnetlink_has_listeners(net, group))
2553 return 0;
2554
2555 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2556 if (skb == NULL)
2557 goto errout;
2558
2559 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2560 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2561 if (nlh == NULL)
2562 goto nlmsg_failure;
2563
2564 nfmsg = nlmsg_data(nlh);
2565 nfmsg->nfgen_family = exp->tuple.src.l3num;
2566 nfmsg->version = NFNETLINK_V0;
2567 nfmsg->res_id = 0;
2568
2569 rcu_read_lock();
2570 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2571 goto nla_put_failure;
2572 rcu_read_unlock();
2573
2574 nlmsg_end(skb, nlh);
2575 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2576 return 0;
2577
2578 nla_put_failure:
2579 rcu_read_unlock();
2580 nlmsg_cancel(skb, nlh);
2581 nlmsg_failure:
2582 kfree_skb(skb);
2583 errout:
2584 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2585 return 0;
2586 }
2587 #endif
2588 static int ctnetlink_exp_done(struct netlink_callback *cb)
2589 {
2590 if (cb->args[1])
2591 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2592 return 0;
2593 }
2594
2595 static int
2596 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2597 {
2598 struct net *net = sock_net(skb->sk);
2599 struct nf_conntrack_expect *exp, *last;
2600 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2601 u_int8_t l3proto = nfmsg->nfgen_family;
2602
2603 rcu_read_lock();
2604 last = (struct nf_conntrack_expect *)cb->args[1];
2605 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2606 restart:
2607 hlist_for_each_entry(exp, &net->ct.expect_hash[cb->args[0]],
2608 hnode) {
2609 if (l3proto && exp->tuple.src.l3num != l3proto)
2610 continue;
2611 if (cb->args[1]) {
2612 if (exp != last)
2613 continue;
2614 cb->args[1] = 0;
2615 }
2616 if (ctnetlink_exp_fill_info(skb,
2617 NETLINK_CB(cb->skb).portid,
2618 cb->nlh->nlmsg_seq,
2619 IPCTNL_MSG_EXP_NEW,
2620 exp) < 0) {
2621 if (!atomic_inc_not_zero(&exp->use))
2622 continue;
2623 cb->args[1] = (unsigned long)exp;
2624 goto out;
2625 }
2626 }
2627 if (cb->args[1]) {
2628 cb->args[1] = 0;
2629 goto restart;
2630 }
2631 }
2632 out:
2633 rcu_read_unlock();
2634 if (last)
2635 nf_ct_expect_put(last);
2636
2637 return skb->len;
2638 }
2639
2640 static int
2641 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2642 {
2643 struct nf_conntrack_expect *exp, *last;
2644 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2645 struct nf_conn *ct = cb->data;
2646 struct nf_conn_help *help = nfct_help(ct);
2647 u_int8_t l3proto = nfmsg->nfgen_family;
2648
2649 if (cb->args[0])
2650 return 0;
2651
2652 rcu_read_lock();
2653 last = (struct nf_conntrack_expect *)cb->args[1];
2654 restart:
2655 hlist_for_each_entry(exp, &help->expectations, lnode) {
2656 if (l3proto && exp->tuple.src.l3num != l3proto)
2657 continue;
2658 if (cb->args[1]) {
2659 if (exp != last)
2660 continue;
2661 cb->args[1] = 0;
2662 }
2663 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2664 cb->nlh->nlmsg_seq,
2665 IPCTNL_MSG_EXP_NEW,
2666 exp) < 0) {
2667 if (!atomic_inc_not_zero(&exp->use))
2668 continue;
2669 cb->args[1] = (unsigned long)exp;
2670 goto out;
2671 }
2672 }
2673 if (cb->args[1]) {
2674 cb->args[1] = 0;
2675 goto restart;
2676 }
2677 cb->args[0] = 1;
2678 out:
2679 rcu_read_unlock();
2680 if (last)
2681 nf_ct_expect_put(last);
2682
2683 return skb->len;
2684 }
2685
2686 static int ctnetlink_dump_exp_ct(struct sock *ctnl, struct sk_buff *skb,
2687 const struct nlmsghdr *nlh,
2688 const struct nlattr * const cda[])
2689 {
2690 int err;
2691 struct net *net = sock_net(ctnl);
2692 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2693 u_int8_t u3 = nfmsg->nfgen_family;
2694 struct nf_conntrack_tuple tuple;
2695 struct nf_conntrack_tuple_hash *h;
2696 struct nf_conn *ct;
2697 struct nf_conntrack_zone zone;
2698 struct netlink_dump_control c = {
2699 .dump = ctnetlink_exp_ct_dump_table,
2700 .done = ctnetlink_exp_done,
2701 };
2702
2703 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2704 u3, NULL);
2705 if (err < 0)
2706 return err;
2707
2708 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2709 if (err < 0)
2710 return err;
2711
2712 h = nf_conntrack_find_get(net, &zone, &tuple);
2713 if (!h)
2714 return -ENOENT;
2715
2716 ct = nf_ct_tuplehash_to_ctrack(h);
2717 c.data = ct;
2718
2719 err = netlink_dump_start(ctnl, skb, nlh, &c);
2720 nf_ct_put(ct);
2721
2722 return err;
2723 }
2724
2725 static int
2726 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
2727 const struct nlmsghdr *nlh,
2728 const struct nlattr * const cda[])
2729 {
2730 struct net *net = sock_net(ctnl);
2731 struct nf_conntrack_tuple tuple;
2732 struct nf_conntrack_expect *exp;
2733 struct sk_buff *skb2;
2734 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2735 u_int8_t u3 = nfmsg->nfgen_family;
2736 struct nf_conntrack_zone zone;
2737 int err;
2738
2739 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2740 if (cda[CTA_EXPECT_MASTER])
2741 return ctnetlink_dump_exp_ct(ctnl, skb, nlh, cda);
2742 else {
2743 struct netlink_dump_control c = {
2744 .dump = ctnetlink_exp_dump_table,
2745 .done = ctnetlink_exp_done,
2746 };
2747 return netlink_dump_start(ctnl, skb, nlh, &c);
2748 }
2749 }
2750
2751 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2752 if (err < 0)
2753 return err;
2754
2755 if (cda[CTA_EXPECT_TUPLE])
2756 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2757 u3, NULL);
2758 else if (cda[CTA_EXPECT_MASTER])
2759 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2760 u3, NULL);
2761 else
2762 return -EINVAL;
2763
2764 if (err < 0)
2765 return err;
2766
2767 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2768 if (!exp)
2769 return -ENOENT;
2770
2771 if (cda[CTA_EXPECT_ID]) {
2772 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2773 if (ntohl(id) != (u32)(unsigned long)exp) {
2774 nf_ct_expect_put(exp);
2775 return -ENOENT;
2776 }
2777 }
2778
2779 err = -ENOMEM;
2780 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2781 if (skb2 == NULL) {
2782 nf_ct_expect_put(exp);
2783 goto out;
2784 }
2785
2786 rcu_read_lock();
2787 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2788 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2789 rcu_read_unlock();
2790 nf_ct_expect_put(exp);
2791 if (err <= 0)
2792 goto free;
2793
2794 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2795 if (err < 0)
2796 goto out;
2797
2798 return 0;
2799
2800 free:
2801 kfree_skb(skb2);
2802 out:
2803 /* this avoids a loop in nfnetlink. */
2804 return err == -EAGAIN ? -ENOBUFS : err;
2805 }
2806
2807 static int
2808 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
2809 const struct nlmsghdr *nlh,
2810 const struct nlattr * const cda[])
2811 {
2812 struct net *net = sock_net(ctnl);
2813 struct nf_conntrack_expect *exp;
2814 struct nf_conntrack_tuple tuple;
2815 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2816 struct hlist_node *next;
2817 u_int8_t u3 = nfmsg->nfgen_family;
2818 struct nf_conntrack_zone zone;
2819 unsigned int i;
2820 int err;
2821
2822 if (cda[CTA_EXPECT_TUPLE]) {
2823 /* delete a single expect by tuple */
2824 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2825 if (err < 0)
2826 return err;
2827
2828 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2829 u3, NULL);
2830 if (err < 0)
2831 return err;
2832
2833 /* bump usage count to 2 */
2834 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2835 if (!exp)
2836 return -ENOENT;
2837
2838 if (cda[CTA_EXPECT_ID]) {
2839 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2840 if (ntohl(id) != (u32)(unsigned long)exp) {
2841 nf_ct_expect_put(exp);
2842 return -ENOENT;
2843 }
2844 }
2845
2846 /* after list removal, usage count == 1 */
2847 spin_lock_bh(&nf_conntrack_expect_lock);
2848 if (del_timer(&exp->timeout)) {
2849 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2850 nlmsg_report(nlh));
2851 nf_ct_expect_put(exp);
2852 }
2853 spin_unlock_bh(&nf_conntrack_expect_lock);
2854 /* have to put what we 'get' above.
2855 * after this line usage count == 0 */
2856 nf_ct_expect_put(exp);
2857 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2858 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2859 struct nf_conn_help *m_help;
2860
2861 /* delete all expectations for this helper */
2862 spin_lock_bh(&nf_conntrack_expect_lock);
2863 for (i = 0; i < nf_ct_expect_hsize; i++) {
2864 hlist_for_each_entry_safe(exp, next,
2865 &net->ct.expect_hash[i],
2866 hnode) {
2867 m_help = nfct_help(exp->master);
2868 if (!strcmp(m_help->helper->name, name) &&
2869 del_timer(&exp->timeout)) {
2870 nf_ct_unlink_expect_report(exp,
2871 NETLINK_CB(skb).portid,
2872 nlmsg_report(nlh));
2873 nf_ct_expect_put(exp);
2874 }
2875 }
2876 }
2877 spin_unlock_bh(&nf_conntrack_expect_lock);
2878 } else {
2879 /* This basically means we have to flush everything*/
2880 spin_lock_bh(&nf_conntrack_expect_lock);
2881 for (i = 0; i < nf_ct_expect_hsize; i++) {
2882 hlist_for_each_entry_safe(exp, next,
2883 &net->ct.expect_hash[i],
2884 hnode) {
2885 if (del_timer(&exp->timeout)) {
2886 nf_ct_unlink_expect_report(exp,
2887 NETLINK_CB(skb).portid,
2888 nlmsg_report(nlh));
2889 nf_ct_expect_put(exp);
2890 }
2891 }
2892 }
2893 spin_unlock_bh(&nf_conntrack_expect_lock);
2894 }
2895
2896 return 0;
2897 }
2898 static int
2899 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2900 const struct nlattr * const cda[])
2901 {
2902 if (cda[CTA_EXPECT_TIMEOUT]) {
2903 if (!del_timer(&x->timeout))
2904 return -ETIME;
2905
2906 x->timeout.expires = jiffies +
2907 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2908 add_timer(&x->timeout);
2909 }
2910 return 0;
2911 }
2912
2913 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2914 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2915 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2916 };
2917
2918 static int
2919 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2920 struct nf_conntrack_expect *exp,
2921 u_int8_t u3)
2922 {
2923 #ifdef CONFIG_NF_NAT_NEEDED
2924 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2925 struct nf_conntrack_tuple nat_tuple = {};
2926 int err;
2927
2928 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2929 if (err < 0)
2930 return err;
2931
2932 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2933 return -EINVAL;
2934
2935 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2936 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
2937 u3, NULL);
2938 if (err < 0)
2939 return err;
2940
2941 exp->saved_addr = nat_tuple.src.u3;
2942 exp->saved_proto = nat_tuple.src.u;
2943 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2944
2945 return 0;
2946 #else
2947 return -EOPNOTSUPP;
2948 #endif
2949 }
2950
2951 static struct nf_conntrack_expect *
2952 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
2953 struct nf_conntrack_helper *helper,
2954 struct nf_conntrack_tuple *tuple,
2955 struct nf_conntrack_tuple *mask)
2956 {
2957 u_int32_t class = 0;
2958 struct nf_conntrack_expect *exp;
2959 struct nf_conn_help *help;
2960 int err;
2961
2962 if (cda[CTA_EXPECT_CLASS] && helper) {
2963 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
2964 if (class > helper->expect_class_max)
2965 return ERR_PTR(-EINVAL);
2966 }
2967 exp = nf_ct_expect_alloc(ct);
2968 if (!exp)
2969 return ERR_PTR(-ENOMEM);
2970
2971 help = nfct_help(ct);
2972 if (!help) {
2973 if (!cda[CTA_EXPECT_TIMEOUT]) {
2974 err = -EINVAL;
2975 goto err_out;
2976 }
2977 exp->timeout.expires =
2978 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2979
2980 exp->flags = NF_CT_EXPECT_USERSPACE;
2981 if (cda[CTA_EXPECT_FLAGS]) {
2982 exp->flags |=
2983 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2984 }
2985 } else {
2986 if (cda[CTA_EXPECT_FLAGS]) {
2987 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2988 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2989 } else
2990 exp->flags = 0;
2991 }
2992 if (cda[CTA_EXPECT_FN]) {
2993 const char *name = nla_data(cda[CTA_EXPECT_FN]);
2994 struct nf_ct_helper_expectfn *expfn;
2995
2996 expfn = nf_ct_helper_expectfn_find_by_name(name);
2997 if (expfn == NULL) {
2998 err = -EINVAL;
2999 goto err_out;
3000 }
3001 exp->expectfn = expfn->expectfn;
3002 } else
3003 exp->expectfn = NULL;
3004
3005 exp->class = class;
3006 exp->master = ct;
3007 exp->helper = helper;
3008 exp->tuple = *tuple;
3009 exp->mask.src.u3 = mask->src.u3;
3010 exp->mask.src.u.all = mask->src.u.all;
3011
3012 if (cda[CTA_EXPECT_NAT]) {
3013 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3014 exp, nf_ct_l3num(ct));
3015 if (err < 0)
3016 goto err_out;
3017 }
3018 return exp;
3019 err_out:
3020 nf_ct_expect_put(exp);
3021 return ERR_PTR(err);
3022 }
3023
3024 static int
3025 ctnetlink_create_expect(struct net *net,
3026 const struct nf_conntrack_zone *zone,
3027 const struct nlattr * const cda[],
3028 u_int8_t u3, u32 portid, int report)
3029 {
3030 struct nf_conntrack_tuple tuple, mask, master_tuple;
3031 struct nf_conntrack_tuple_hash *h = NULL;
3032 struct nf_conntrack_helper *helper = NULL;
3033 struct nf_conntrack_expect *exp;
3034 struct nf_conn *ct;
3035 int err;
3036
3037 /* caller guarantees that those three CTA_EXPECT_* exist */
3038 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3039 u3, NULL);
3040 if (err < 0)
3041 return err;
3042 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3043 u3, NULL);
3044 if (err < 0)
3045 return err;
3046 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3047 u3, NULL);
3048 if (err < 0)
3049 return err;
3050
3051 /* Look for master conntrack of this expectation */
3052 h = nf_conntrack_find_get(net, zone, &master_tuple);
3053 if (!h)
3054 return -ENOENT;
3055 ct = nf_ct_tuplehash_to_ctrack(h);
3056
3057 if (cda[CTA_EXPECT_HELP_NAME]) {
3058 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3059
3060 helper = __nf_conntrack_helper_find(helpname, u3,
3061 nf_ct_protonum(ct));
3062 if (helper == NULL) {
3063 #ifdef CONFIG_MODULES
3064 if (request_module("nfct-helper-%s", helpname) < 0) {
3065 err = -EOPNOTSUPP;
3066 goto err_ct;
3067 }
3068 helper = __nf_conntrack_helper_find(helpname, u3,
3069 nf_ct_protonum(ct));
3070 if (helper) {
3071 err = -EAGAIN;
3072 goto err_ct;
3073 }
3074 #endif
3075 err = -EOPNOTSUPP;
3076 goto err_ct;
3077 }
3078 }
3079
3080 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3081 if (IS_ERR(exp)) {
3082 err = PTR_ERR(exp);
3083 goto err_ct;
3084 }
3085
3086 err = nf_ct_expect_related_report(exp, portid, report);
3087 nf_ct_expect_put(exp);
3088 err_ct:
3089 nf_ct_put(ct);
3090 return err;
3091 }
3092
3093 static int
3094 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
3095 const struct nlmsghdr *nlh,
3096 const struct nlattr * const cda[])
3097 {
3098 struct net *net = sock_net(ctnl);
3099 struct nf_conntrack_tuple tuple;
3100 struct nf_conntrack_expect *exp;
3101 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3102 u_int8_t u3 = nfmsg->nfgen_family;
3103 struct nf_conntrack_zone zone;
3104 int err;
3105
3106 if (!cda[CTA_EXPECT_TUPLE]
3107 || !cda[CTA_EXPECT_MASK]
3108 || !cda[CTA_EXPECT_MASTER])
3109 return -EINVAL;
3110
3111 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3112 if (err < 0)
3113 return err;
3114
3115 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3116 u3, NULL);
3117 if (err < 0)
3118 return err;
3119
3120 spin_lock_bh(&nf_conntrack_expect_lock);
3121 exp = __nf_ct_expect_find(net, &zone, &tuple);
3122 if (!exp) {
3123 spin_unlock_bh(&nf_conntrack_expect_lock);
3124 err = -ENOENT;
3125 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3126 err = ctnetlink_create_expect(net, &zone, cda, u3,
3127 NETLINK_CB(skb).portid,
3128 nlmsg_report(nlh));
3129 }
3130 return err;
3131 }
3132
3133 err = -EEXIST;
3134 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3135 err = ctnetlink_change_expect(exp, cda);
3136 spin_unlock_bh(&nf_conntrack_expect_lock);
3137
3138 return err;
3139 }
3140
3141 static int
3142 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3143 const struct ip_conntrack_stat *st)
3144 {
3145 struct nlmsghdr *nlh;
3146 struct nfgenmsg *nfmsg;
3147 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3148
3149 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
3150 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3151 if (nlh == NULL)
3152 goto nlmsg_failure;
3153
3154 nfmsg = nlmsg_data(nlh);
3155 nfmsg->nfgen_family = AF_UNSPEC;
3156 nfmsg->version = NFNETLINK_V0;
3157 nfmsg->res_id = htons(cpu);
3158
3159 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3160 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3161 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3162 goto nla_put_failure;
3163
3164 nlmsg_end(skb, nlh);
3165 return skb->len;
3166
3167 nla_put_failure:
3168 nlmsg_failure:
3169 nlmsg_cancel(skb, nlh);
3170 return -1;
3171 }
3172
3173 static int
3174 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3175 {
3176 int cpu;
3177 struct net *net = sock_net(skb->sk);
3178
3179 if (cb->args[0] == nr_cpu_ids)
3180 return 0;
3181
3182 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3183 const struct ip_conntrack_stat *st;
3184
3185 if (!cpu_possible(cpu))
3186 continue;
3187
3188 st = per_cpu_ptr(net->ct.stat, cpu);
3189 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3190 cb->nlh->nlmsg_seq,
3191 cpu, st) < 0)
3192 break;
3193 }
3194 cb->args[0] = cpu;
3195
3196 return skb->len;
3197 }
3198
3199 static int
3200 ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
3201 const struct nlmsghdr *nlh,
3202 const struct nlattr * const cda[])
3203 {
3204 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3205 struct netlink_dump_control c = {
3206 .dump = ctnetlink_exp_stat_cpu_dump,
3207 };
3208 return netlink_dump_start(ctnl, skb, nlh, &c);
3209 }
3210
3211 return 0;
3212 }
3213
3214 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3215 static struct nf_ct_event_notifier ctnl_notifier = {
3216 .fcn = ctnetlink_conntrack_event,
3217 };
3218
3219 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3220 .fcn = ctnetlink_expect_event,
3221 };
3222 #endif
3223
3224 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3225 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3226 .attr_count = CTA_MAX,
3227 .policy = ct_nla_policy },
3228 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3229 .attr_count = CTA_MAX,
3230 .policy = ct_nla_policy },
3231 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3232 .attr_count = CTA_MAX,
3233 .policy = ct_nla_policy },
3234 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3235 .attr_count = CTA_MAX,
3236 .policy = ct_nla_policy },
3237 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3238 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3239 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3240 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3241 };
3242
3243 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3244 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3245 .attr_count = CTA_EXPECT_MAX,
3246 .policy = exp_nla_policy },
3247 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3248 .attr_count = CTA_EXPECT_MAX,
3249 .policy = exp_nla_policy },
3250 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3251 .attr_count = CTA_EXPECT_MAX,
3252 .policy = exp_nla_policy },
3253 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3254 };
3255
3256 static const struct nfnetlink_subsystem ctnl_subsys = {
3257 .name = "conntrack",
3258 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3259 .cb_count = IPCTNL_MSG_MAX,
3260 .cb = ctnl_cb,
3261 };
3262
3263 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3264 .name = "conntrack_expect",
3265 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3266 .cb_count = IPCTNL_MSG_EXP_MAX,
3267 .cb = ctnl_exp_cb,
3268 };
3269
3270 MODULE_ALIAS("ip_conntrack_netlink");
3271 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3272 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3273
3274 static int __net_init ctnetlink_net_init(struct net *net)
3275 {
3276 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3277 int ret;
3278
3279 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3280 if (ret < 0) {
3281 pr_err("ctnetlink_init: cannot register notifier.\n");
3282 goto err_out;
3283 }
3284
3285 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3286 if (ret < 0) {
3287 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3288 goto err_unreg_notifier;
3289 }
3290 #endif
3291 return 0;
3292
3293 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3294 err_unreg_notifier:
3295 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3296 err_out:
3297 return ret;
3298 #endif
3299 }
3300
3301 static void ctnetlink_net_exit(struct net *net)
3302 {
3303 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3304 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3305 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3306 #endif
3307 }
3308
3309 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3310 {
3311 struct net *net;
3312
3313 list_for_each_entry(net, net_exit_list, exit_list)
3314 ctnetlink_net_exit(net);
3315 }
3316
3317 static struct pernet_operations ctnetlink_net_ops = {
3318 .init = ctnetlink_net_init,
3319 .exit_batch = ctnetlink_net_exit_batch,
3320 };
3321
3322 static int __init ctnetlink_init(void)
3323 {
3324 int ret;
3325
3326 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3327 ret = nfnetlink_subsys_register(&ctnl_subsys);
3328 if (ret < 0) {
3329 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3330 goto err_out;
3331 }
3332
3333 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3334 if (ret < 0) {
3335 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3336 goto err_unreg_subsys;
3337 }
3338
3339 ret = register_pernet_subsys(&ctnetlink_net_ops);
3340 if (ret < 0) {
3341 pr_err("ctnetlink_init: cannot register pernet operations\n");
3342 goto err_unreg_exp_subsys;
3343 }
3344 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3345 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3346 RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
3347 #endif
3348 return 0;
3349
3350 err_unreg_exp_subsys:
3351 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3352 err_unreg_subsys:
3353 nfnetlink_subsys_unregister(&ctnl_subsys);
3354 err_out:
3355 return ret;
3356 }
3357
3358 static void __exit ctnetlink_exit(void)
3359 {
3360 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3361
3362 unregister_pernet_subsys(&ctnetlink_net_ops);
3363 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3364 nfnetlink_subsys_unregister(&ctnl_subsys);
3365 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3366 RCU_INIT_POINTER(nfq_ct_hook, NULL);
3367 #endif
3368 }
3369
3370 module_init(ctnetlink_init);
3371 module_exit(ctnetlink_exit);
Linux kernel - Deliverables
This page took 0.108959 seconds and 6 git commands to generate.