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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[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_GLUE_CT
2137 static size_t
2138 ctnetlink_glue_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 struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2166 enum ip_conntrack_info *ctinfo)
2167 {
2168 struct nf_conn *ct;
2169
2170 ct = nf_ct_get(skb, ctinfo);
2171 if (ct && nf_ct_is_untracked(ct))
2172 ct = NULL;
2173
2174 return ct;
2175 }
2176
2177 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2178 {
2179 const struct nf_conntrack_zone *zone;
2180 struct nlattr *nest_parms;
2181
2182 rcu_read_lock();
2183 zone = nf_ct_zone(ct);
2184
2185 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2186 if (!nest_parms)
2187 goto nla_put_failure;
2188 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2189 goto nla_put_failure;
2190 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2191 NF_CT_ZONE_DIR_ORIG) < 0)
2192 goto nla_put_failure;
2193 nla_nest_end(skb, nest_parms);
2194
2195 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2196 if (!nest_parms)
2197 goto nla_put_failure;
2198 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2199 goto nla_put_failure;
2200 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2201 NF_CT_ZONE_DIR_REPL) < 0)
2202 goto nla_put_failure;
2203 nla_nest_end(skb, nest_parms);
2204
2205 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2206 NF_CT_DEFAULT_ZONE_DIR) < 0)
2207 goto nla_put_failure;
2208
2209 if (ctnetlink_dump_id(skb, ct) < 0)
2210 goto nla_put_failure;
2211
2212 if (ctnetlink_dump_status(skb, ct) < 0)
2213 goto nla_put_failure;
2214
2215 if (ctnetlink_dump_timeout(skb, ct) < 0)
2216 goto nla_put_failure;
2217
2218 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2219 goto nla_put_failure;
2220
2221 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2222 goto nla_put_failure;
2223
2224 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2225 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2226 goto nla_put_failure;
2227 #endif
2228 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2229 goto nla_put_failure;
2230
2231 if ((ct->status & IPS_SEQ_ADJUST) &&
2232 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2233 goto nla_put_failure;
2234
2235 #ifdef CONFIG_NF_CONNTRACK_MARK
2236 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2237 goto nla_put_failure;
2238 #endif
2239 if (ctnetlink_dump_labels(skb, ct) < 0)
2240 goto nla_put_failure;
2241 rcu_read_unlock();
2242 return 0;
2243
2244 nla_put_failure:
2245 rcu_read_unlock();
2246 return -ENOSPC;
2247 }
2248
2249 static int
2250 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2251 enum ip_conntrack_info ctinfo,
2252 u_int16_t ct_attr, u_int16_t ct_info_attr)
2253 {
2254 struct nlattr *nest_parms;
2255
2256 nest_parms = nla_nest_start(skb, ct_attr | NLA_F_NESTED);
2257 if (!nest_parms)
2258 goto nla_put_failure;
2259
2260 if (__ctnetlink_glue_build(skb, ct) < 0)
2261 goto nla_put_failure;
2262
2263 nla_nest_end(skb, nest_parms);
2264
2265 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2266 goto nla_put_failure;
2267
2268 return 0;
2269
2270 nla_put_failure:
2271 return -ENOSPC;
2272 }
2273
2274 static int
2275 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2276 {
2277 int err;
2278
2279 if (cda[CTA_TIMEOUT]) {
2280 err = ctnetlink_change_timeout(ct, cda);
2281 if (err < 0)
2282 return err;
2283 }
2284 if (cda[CTA_STATUS]) {
2285 err = ctnetlink_change_status(ct, cda);
2286 if (err < 0)
2287 return err;
2288 }
2289 if (cda[CTA_HELP]) {
2290 err = ctnetlink_change_helper(ct, cda);
2291 if (err < 0)
2292 return err;
2293 }
2294 if (cda[CTA_LABELS]) {
2295 err = ctnetlink_attach_labels(ct, cda);
2296 if (err < 0)
2297 return err;
2298 }
2299 #if defined(CONFIG_NF_CONNTRACK_MARK)
2300 if (cda[CTA_MARK]) {
2301 u32 mask = 0, mark, newmark;
2302 if (cda[CTA_MARK_MASK])
2303 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2304
2305 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2306 newmark = (ct->mark & mask) ^ mark;
2307 if (newmark != ct->mark)
2308 ct->mark = newmark;
2309 }
2310 #endif
2311 return 0;
2312 }
2313
2314 static int
2315 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2316 {
2317 struct nlattr *cda[CTA_MAX+1];
2318 int ret;
2319
2320 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2321 if (ret < 0)
2322 return ret;
2323
2324 spin_lock_bh(&nf_conntrack_expect_lock);
2325 ret = ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2326 spin_unlock_bh(&nf_conntrack_expect_lock);
2327
2328 return ret;
2329 }
2330
2331 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2332 const struct nf_conn *ct,
2333 struct nf_conntrack_tuple *tuple,
2334 struct nf_conntrack_tuple *mask)
2335 {
2336 int err;
2337
2338 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2339 nf_ct_l3num(ct), NULL);
2340 if (err < 0)
2341 return err;
2342
2343 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2344 nf_ct_l3num(ct), NULL);
2345 }
2346
2347 static int
2348 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2349 u32 portid, u32 report)
2350 {
2351 struct nlattr *cda[CTA_EXPECT_MAX+1];
2352 struct nf_conntrack_tuple tuple, mask;
2353 struct nf_conntrack_helper *helper = NULL;
2354 struct nf_conntrack_expect *exp;
2355 int err;
2356
2357 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2358 if (err < 0)
2359 return err;
2360
2361 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2362 ct, &tuple, &mask);
2363 if (err < 0)
2364 return err;
2365
2366 if (cda[CTA_EXPECT_HELP_NAME]) {
2367 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2368
2369 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2370 nf_ct_protonum(ct));
2371 if (helper == NULL)
2372 return -EOPNOTSUPP;
2373 }
2374
2375 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2376 helper, &tuple, &mask);
2377 if (IS_ERR(exp))
2378 return PTR_ERR(exp);
2379
2380 err = nf_ct_expect_related_report(exp, portid, report);
2381 if (err < 0) {
2382 nf_ct_expect_put(exp);
2383 return err;
2384 }
2385
2386 return 0;
2387 }
2388
2389 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2390 enum ip_conntrack_info ctinfo, int diff)
2391 {
2392 if (!(ct->status & IPS_NAT_MASK))
2393 return;
2394
2395 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2396 }
2397
2398 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2399 .get_ct = ctnetlink_glue_get_ct,
2400 .build_size = ctnetlink_glue_build_size,
2401 .build = ctnetlink_glue_build,
2402 .parse = ctnetlink_glue_parse,
2403 .attach_expect = ctnetlink_glue_attach_expect,
2404 .seq_adjust = ctnetlink_glue_seqadj,
2405 };
2406 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2407
2408 /***********************************************************************
2409 * EXPECT
2410 ***********************************************************************/
2411
2412 static inline int
2413 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2414 const struct nf_conntrack_tuple *tuple,
2415 enum ctattr_expect type)
2416 {
2417 struct nlattr *nest_parms;
2418
2419 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2420 if (!nest_parms)
2421 goto nla_put_failure;
2422 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2423 goto nla_put_failure;
2424 nla_nest_end(skb, nest_parms);
2425
2426 return 0;
2427
2428 nla_put_failure:
2429 return -1;
2430 }
2431
2432 static inline int
2433 ctnetlink_exp_dump_mask(struct sk_buff *skb,
2434 const struct nf_conntrack_tuple *tuple,
2435 const struct nf_conntrack_tuple_mask *mask)
2436 {
2437 int ret;
2438 struct nf_conntrack_l3proto *l3proto;
2439 struct nf_conntrack_l4proto *l4proto;
2440 struct nf_conntrack_tuple m;
2441 struct nlattr *nest_parms;
2442
2443 memset(&m, 0xFF, sizeof(m));
2444 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2445 m.src.u.all = mask->src.u.all;
2446 m.dst.protonum = tuple->dst.protonum;
2447
2448 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2449 if (!nest_parms)
2450 goto nla_put_failure;
2451
2452 rcu_read_lock();
2453 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2454 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2455 if (ret >= 0) {
2456 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2457 tuple->dst.protonum);
2458 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2459 }
2460 rcu_read_unlock();
2461
2462 if (unlikely(ret < 0))
2463 goto nla_put_failure;
2464
2465 nla_nest_end(skb, nest_parms);
2466
2467 return 0;
2468
2469 nla_put_failure:
2470 return -1;
2471 }
2472
2473 static const union nf_inet_addr any_addr;
2474
2475 static int
2476 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2477 const struct nf_conntrack_expect *exp)
2478 {
2479 struct nf_conn *master = exp->master;
2480 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2481 struct nf_conn_help *help;
2482 #ifdef CONFIG_NF_NAT_NEEDED
2483 struct nlattr *nest_parms;
2484 struct nf_conntrack_tuple nat_tuple = {};
2485 #endif
2486 struct nf_ct_helper_expectfn *expfn;
2487
2488 if (timeout < 0)
2489 timeout = 0;
2490
2491 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2492 goto nla_put_failure;
2493 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2494 goto nla_put_failure;
2495 if (ctnetlink_exp_dump_tuple(skb,
2496 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2497 CTA_EXPECT_MASTER) < 0)
2498 goto nla_put_failure;
2499
2500 #ifdef CONFIG_NF_NAT_NEEDED
2501 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2502 exp->saved_proto.all) {
2503 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2504 if (!nest_parms)
2505 goto nla_put_failure;
2506
2507 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2508 goto nla_put_failure;
2509
2510 nat_tuple.src.l3num = nf_ct_l3num(master);
2511 nat_tuple.src.u3 = exp->saved_addr;
2512 nat_tuple.dst.protonum = nf_ct_protonum(master);
2513 nat_tuple.src.u = exp->saved_proto;
2514
2515 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2516 CTA_EXPECT_NAT_TUPLE) < 0)
2517 goto nla_put_failure;
2518 nla_nest_end(skb, nest_parms);
2519 }
2520 #endif
2521 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2522 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2523 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2524 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2525 goto nla_put_failure;
2526 help = nfct_help(master);
2527 if (help) {
2528 struct nf_conntrack_helper *helper;
2529
2530 helper = rcu_dereference(help->helper);
2531 if (helper &&
2532 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2533 goto nla_put_failure;
2534 }
2535 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2536 if (expfn != NULL &&
2537 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2538 goto nla_put_failure;
2539
2540 return 0;
2541
2542 nla_put_failure:
2543 return -1;
2544 }
2545
2546 static int
2547 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2548 int event, const struct nf_conntrack_expect *exp)
2549 {
2550 struct nlmsghdr *nlh;
2551 struct nfgenmsg *nfmsg;
2552 unsigned int flags = portid ? NLM_F_MULTI : 0;
2553
2554 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2555 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2556 if (nlh == NULL)
2557 goto nlmsg_failure;
2558
2559 nfmsg = nlmsg_data(nlh);
2560 nfmsg->nfgen_family = exp->tuple.src.l3num;
2561 nfmsg->version = NFNETLINK_V0;
2562 nfmsg->res_id = 0;
2563
2564 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2565 goto nla_put_failure;
2566
2567 nlmsg_end(skb, nlh);
2568 return skb->len;
2569
2570 nlmsg_failure:
2571 nla_put_failure:
2572 nlmsg_cancel(skb, nlh);
2573 return -1;
2574 }
2575
2576 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2577 static int
2578 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2579 {
2580 struct nf_conntrack_expect *exp = item->exp;
2581 struct net *net = nf_ct_exp_net(exp);
2582 struct nlmsghdr *nlh;
2583 struct nfgenmsg *nfmsg;
2584 struct sk_buff *skb;
2585 unsigned int type, group;
2586 int flags = 0;
2587
2588 if (events & (1 << IPEXP_DESTROY)) {
2589 type = IPCTNL_MSG_EXP_DELETE;
2590 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2591 } else if (events & (1 << IPEXP_NEW)) {
2592 type = IPCTNL_MSG_EXP_NEW;
2593 flags = NLM_F_CREATE|NLM_F_EXCL;
2594 group = NFNLGRP_CONNTRACK_EXP_NEW;
2595 } else
2596 return 0;
2597
2598 if (!item->report && !nfnetlink_has_listeners(net, group))
2599 return 0;
2600
2601 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2602 if (skb == NULL)
2603 goto errout;
2604
2605 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2606 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2607 if (nlh == NULL)
2608 goto nlmsg_failure;
2609
2610 nfmsg = nlmsg_data(nlh);
2611 nfmsg->nfgen_family = exp->tuple.src.l3num;
2612 nfmsg->version = NFNETLINK_V0;
2613 nfmsg->res_id = 0;
2614
2615 rcu_read_lock();
2616 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2617 goto nla_put_failure;
2618 rcu_read_unlock();
2619
2620 nlmsg_end(skb, nlh);
2621 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2622 return 0;
2623
2624 nla_put_failure:
2625 rcu_read_unlock();
2626 nlmsg_cancel(skb, nlh);
2627 nlmsg_failure:
2628 kfree_skb(skb);
2629 errout:
2630 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2631 return 0;
2632 }
2633 #endif
2634 static int ctnetlink_exp_done(struct netlink_callback *cb)
2635 {
2636 if (cb->args[1])
2637 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2638 return 0;
2639 }
2640
2641 static int
2642 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2643 {
2644 struct net *net = sock_net(skb->sk);
2645 struct nf_conntrack_expect *exp, *last;
2646 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2647 u_int8_t l3proto = nfmsg->nfgen_family;
2648
2649 rcu_read_lock();
2650 last = (struct nf_conntrack_expect *)cb->args[1];
2651 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2652 restart:
2653 hlist_for_each_entry(exp, &net->ct.expect_hash[cb->args[0]],
2654 hnode) {
2655 if (l3proto && exp->tuple.src.l3num != l3proto)
2656 continue;
2657 if (cb->args[1]) {
2658 if (exp != last)
2659 continue;
2660 cb->args[1] = 0;
2661 }
2662 if (ctnetlink_exp_fill_info(skb,
2663 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 }
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
2687 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2688 {
2689 struct nf_conntrack_expect *exp, *last;
2690 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2691 struct nf_conn *ct = cb->data;
2692 struct nf_conn_help *help = nfct_help(ct);
2693 u_int8_t l3proto = nfmsg->nfgen_family;
2694
2695 if (cb->args[0])
2696 return 0;
2697
2698 rcu_read_lock();
2699 last = (struct nf_conntrack_expect *)cb->args[1];
2700 restart:
2701 hlist_for_each_entry(exp, &help->expectations, lnode) {
2702 if (l3proto && exp->tuple.src.l3num != l3proto)
2703 continue;
2704 if (cb->args[1]) {
2705 if (exp != last)
2706 continue;
2707 cb->args[1] = 0;
2708 }
2709 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2710 cb->nlh->nlmsg_seq,
2711 IPCTNL_MSG_EXP_NEW,
2712 exp) < 0) {
2713 if (!atomic_inc_not_zero(&exp->use))
2714 continue;
2715 cb->args[1] = (unsigned long)exp;
2716 goto out;
2717 }
2718 }
2719 if (cb->args[1]) {
2720 cb->args[1] = 0;
2721 goto restart;
2722 }
2723 cb->args[0] = 1;
2724 out:
2725 rcu_read_unlock();
2726 if (last)
2727 nf_ct_expect_put(last);
2728
2729 return skb->len;
2730 }
2731
2732 static int ctnetlink_dump_exp_ct(struct sock *ctnl, struct sk_buff *skb,
2733 const struct nlmsghdr *nlh,
2734 const struct nlattr * const cda[])
2735 {
2736 int err;
2737 struct net *net = sock_net(ctnl);
2738 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2739 u_int8_t u3 = nfmsg->nfgen_family;
2740 struct nf_conntrack_tuple tuple;
2741 struct nf_conntrack_tuple_hash *h;
2742 struct nf_conn *ct;
2743 struct nf_conntrack_zone zone;
2744 struct netlink_dump_control c = {
2745 .dump = ctnetlink_exp_ct_dump_table,
2746 .done = ctnetlink_exp_done,
2747 };
2748
2749 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2750 u3, NULL);
2751 if (err < 0)
2752 return err;
2753
2754 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2755 if (err < 0)
2756 return err;
2757
2758 h = nf_conntrack_find_get(net, &zone, &tuple);
2759 if (!h)
2760 return -ENOENT;
2761
2762 ct = nf_ct_tuplehash_to_ctrack(h);
2763 c.data = ct;
2764
2765 err = netlink_dump_start(ctnl, skb, nlh, &c);
2766 nf_ct_put(ct);
2767
2768 return err;
2769 }
2770
2771 static int
2772 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
2773 const struct nlmsghdr *nlh,
2774 const struct nlattr * const cda[])
2775 {
2776 struct net *net = sock_net(ctnl);
2777 struct nf_conntrack_tuple tuple;
2778 struct nf_conntrack_expect *exp;
2779 struct sk_buff *skb2;
2780 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2781 u_int8_t u3 = nfmsg->nfgen_family;
2782 struct nf_conntrack_zone zone;
2783 int err;
2784
2785 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2786 if (cda[CTA_EXPECT_MASTER])
2787 return ctnetlink_dump_exp_ct(ctnl, skb, nlh, cda);
2788 else {
2789 struct netlink_dump_control c = {
2790 .dump = ctnetlink_exp_dump_table,
2791 .done = ctnetlink_exp_done,
2792 };
2793 return netlink_dump_start(ctnl, skb, nlh, &c);
2794 }
2795 }
2796
2797 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2798 if (err < 0)
2799 return err;
2800
2801 if (cda[CTA_EXPECT_TUPLE])
2802 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2803 u3, NULL);
2804 else if (cda[CTA_EXPECT_MASTER])
2805 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2806 u3, NULL);
2807 else
2808 return -EINVAL;
2809
2810 if (err < 0)
2811 return err;
2812
2813 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2814 if (!exp)
2815 return -ENOENT;
2816
2817 if (cda[CTA_EXPECT_ID]) {
2818 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2819 if (ntohl(id) != (u32)(unsigned long)exp) {
2820 nf_ct_expect_put(exp);
2821 return -ENOENT;
2822 }
2823 }
2824
2825 err = -ENOMEM;
2826 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2827 if (skb2 == NULL) {
2828 nf_ct_expect_put(exp);
2829 goto out;
2830 }
2831
2832 rcu_read_lock();
2833 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2834 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2835 rcu_read_unlock();
2836 nf_ct_expect_put(exp);
2837 if (err <= 0)
2838 goto free;
2839
2840 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2841 if (err < 0)
2842 goto out;
2843
2844 return 0;
2845
2846 free:
2847 kfree_skb(skb2);
2848 out:
2849 /* this avoids a loop in nfnetlink. */
2850 return err == -EAGAIN ? -ENOBUFS : err;
2851 }
2852
2853 static int
2854 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
2855 const struct nlmsghdr *nlh,
2856 const struct nlattr * const cda[])
2857 {
2858 struct net *net = sock_net(ctnl);
2859 struct nf_conntrack_expect *exp;
2860 struct nf_conntrack_tuple tuple;
2861 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2862 struct hlist_node *next;
2863 u_int8_t u3 = nfmsg->nfgen_family;
2864 struct nf_conntrack_zone zone;
2865 unsigned int i;
2866 int err;
2867
2868 if (cda[CTA_EXPECT_TUPLE]) {
2869 /* delete a single expect by tuple */
2870 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2871 if (err < 0)
2872 return err;
2873
2874 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2875 u3, NULL);
2876 if (err < 0)
2877 return err;
2878
2879 /* bump usage count to 2 */
2880 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2881 if (!exp)
2882 return -ENOENT;
2883
2884 if (cda[CTA_EXPECT_ID]) {
2885 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2886 if (ntohl(id) != (u32)(unsigned long)exp) {
2887 nf_ct_expect_put(exp);
2888 return -ENOENT;
2889 }
2890 }
2891
2892 /* after list removal, usage count == 1 */
2893 spin_lock_bh(&nf_conntrack_expect_lock);
2894 if (del_timer(&exp->timeout)) {
2895 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2896 nlmsg_report(nlh));
2897 nf_ct_expect_put(exp);
2898 }
2899 spin_unlock_bh(&nf_conntrack_expect_lock);
2900 /* have to put what we 'get' above.
2901 * after this line usage count == 0 */
2902 nf_ct_expect_put(exp);
2903 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2904 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2905 struct nf_conn_help *m_help;
2906
2907 /* delete all expectations for this helper */
2908 spin_lock_bh(&nf_conntrack_expect_lock);
2909 for (i = 0; i < nf_ct_expect_hsize; i++) {
2910 hlist_for_each_entry_safe(exp, next,
2911 &net->ct.expect_hash[i],
2912 hnode) {
2913 m_help = nfct_help(exp->master);
2914 if (!strcmp(m_help->helper->name, name) &&
2915 del_timer(&exp->timeout)) {
2916 nf_ct_unlink_expect_report(exp,
2917 NETLINK_CB(skb).portid,
2918 nlmsg_report(nlh));
2919 nf_ct_expect_put(exp);
2920 }
2921 }
2922 }
2923 spin_unlock_bh(&nf_conntrack_expect_lock);
2924 } else {
2925 /* This basically means we have to flush everything*/
2926 spin_lock_bh(&nf_conntrack_expect_lock);
2927 for (i = 0; i < nf_ct_expect_hsize; i++) {
2928 hlist_for_each_entry_safe(exp, next,
2929 &net->ct.expect_hash[i],
2930 hnode) {
2931 if (del_timer(&exp->timeout)) {
2932 nf_ct_unlink_expect_report(exp,
2933 NETLINK_CB(skb).portid,
2934 nlmsg_report(nlh));
2935 nf_ct_expect_put(exp);
2936 }
2937 }
2938 }
2939 spin_unlock_bh(&nf_conntrack_expect_lock);
2940 }
2941
2942 return 0;
2943 }
2944 static int
2945 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2946 const struct nlattr * const cda[])
2947 {
2948 if (cda[CTA_EXPECT_TIMEOUT]) {
2949 if (!del_timer(&x->timeout))
2950 return -ETIME;
2951
2952 x->timeout.expires = jiffies +
2953 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2954 add_timer(&x->timeout);
2955 }
2956 return 0;
2957 }
2958
2959 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2960 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2961 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2962 };
2963
2964 static int
2965 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2966 struct nf_conntrack_expect *exp,
2967 u_int8_t u3)
2968 {
2969 #ifdef CONFIG_NF_NAT_NEEDED
2970 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2971 struct nf_conntrack_tuple nat_tuple = {};
2972 int err;
2973
2974 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2975 if (err < 0)
2976 return err;
2977
2978 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2979 return -EINVAL;
2980
2981 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2982 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
2983 u3, NULL);
2984 if (err < 0)
2985 return err;
2986
2987 exp->saved_addr = nat_tuple.src.u3;
2988 exp->saved_proto = nat_tuple.src.u;
2989 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2990
2991 return 0;
2992 #else
2993 return -EOPNOTSUPP;
2994 #endif
2995 }
2996
2997 static struct nf_conntrack_expect *
2998 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
2999 struct nf_conntrack_helper *helper,
3000 struct nf_conntrack_tuple *tuple,
3001 struct nf_conntrack_tuple *mask)
3002 {
3003 u_int32_t class = 0;
3004 struct nf_conntrack_expect *exp;
3005 struct nf_conn_help *help;
3006 int err;
3007
3008 if (cda[CTA_EXPECT_CLASS] && helper) {
3009 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3010 if (class > helper->expect_class_max)
3011 return ERR_PTR(-EINVAL);
3012 }
3013 exp = nf_ct_expect_alloc(ct);
3014 if (!exp)
3015 return ERR_PTR(-ENOMEM);
3016
3017 help = nfct_help(ct);
3018 if (!help) {
3019 if (!cda[CTA_EXPECT_TIMEOUT]) {
3020 err = -EINVAL;
3021 goto err_out;
3022 }
3023 exp->timeout.expires =
3024 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3025
3026 exp->flags = NF_CT_EXPECT_USERSPACE;
3027 if (cda[CTA_EXPECT_FLAGS]) {
3028 exp->flags |=
3029 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3030 }
3031 } else {
3032 if (cda[CTA_EXPECT_FLAGS]) {
3033 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3034 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3035 } else
3036 exp->flags = 0;
3037 }
3038 if (cda[CTA_EXPECT_FN]) {
3039 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3040 struct nf_ct_helper_expectfn *expfn;
3041
3042 expfn = nf_ct_helper_expectfn_find_by_name(name);
3043 if (expfn == NULL) {
3044 err = -EINVAL;
3045 goto err_out;
3046 }
3047 exp->expectfn = expfn->expectfn;
3048 } else
3049 exp->expectfn = NULL;
3050
3051 exp->class = class;
3052 exp->master = ct;
3053 exp->helper = helper;
3054 exp->tuple = *tuple;
3055 exp->mask.src.u3 = mask->src.u3;
3056 exp->mask.src.u.all = mask->src.u.all;
3057
3058 if (cda[CTA_EXPECT_NAT]) {
3059 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3060 exp, nf_ct_l3num(ct));
3061 if (err < 0)
3062 goto err_out;
3063 }
3064 return exp;
3065 err_out:
3066 nf_ct_expect_put(exp);
3067 return ERR_PTR(err);
3068 }
3069
3070 static int
3071 ctnetlink_create_expect(struct net *net,
3072 const struct nf_conntrack_zone *zone,
3073 const struct nlattr * const cda[],
3074 u_int8_t u3, u32 portid, int report)
3075 {
3076 struct nf_conntrack_tuple tuple, mask, master_tuple;
3077 struct nf_conntrack_tuple_hash *h = NULL;
3078 struct nf_conntrack_helper *helper = NULL;
3079 struct nf_conntrack_expect *exp;
3080 struct nf_conn *ct;
3081 int err;
3082
3083 /* caller guarantees that those three CTA_EXPECT_* exist */
3084 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3085 u3, NULL);
3086 if (err < 0)
3087 return err;
3088 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3089 u3, NULL);
3090 if (err < 0)
3091 return err;
3092 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3093 u3, NULL);
3094 if (err < 0)
3095 return err;
3096
3097 /* Look for master conntrack of this expectation */
3098 h = nf_conntrack_find_get(net, zone, &master_tuple);
3099 if (!h)
3100 return -ENOENT;
3101 ct = nf_ct_tuplehash_to_ctrack(h);
3102
3103 if (cda[CTA_EXPECT_HELP_NAME]) {
3104 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3105
3106 helper = __nf_conntrack_helper_find(helpname, u3,
3107 nf_ct_protonum(ct));
3108 if (helper == NULL) {
3109 #ifdef CONFIG_MODULES
3110 if (request_module("nfct-helper-%s", helpname) < 0) {
3111 err = -EOPNOTSUPP;
3112 goto err_ct;
3113 }
3114 helper = __nf_conntrack_helper_find(helpname, u3,
3115 nf_ct_protonum(ct));
3116 if (helper) {
3117 err = -EAGAIN;
3118 goto err_ct;
3119 }
3120 #endif
3121 err = -EOPNOTSUPP;
3122 goto err_ct;
3123 }
3124 }
3125
3126 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3127 if (IS_ERR(exp)) {
3128 err = PTR_ERR(exp);
3129 goto err_ct;
3130 }
3131
3132 err = nf_ct_expect_related_report(exp, portid, report);
3133 nf_ct_expect_put(exp);
3134 err_ct:
3135 nf_ct_put(ct);
3136 return err;
3137 }
3138
3139 static int
3140 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
3141 const struct nlmsghdr *nlh,
3142 const struct nlattr * const cda[])
3143 {
3144 struct net *net = sock_net(ctnl);
3145 struct nf_conntrack_tuple tuple;
3146 struct nf_conntrack_expect *exp;
3147 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3148 u_int8_t u3 = nfmsg->nfgen_family;
3149 struct nf_conntrack_zone zone;
3150 int err;
3151
3152 if (!cda[CTA_EXPECT_TUPLE]
3153 || !cda[CTA_EXPECT_MASK]
3154 || !cda[CTA_EXPECT_MASTER])
3155 return -EINVAL;
3156
3157 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3158 if (err < 0)
3159 return err;
3160
3161 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3162 u3, NULL);
3163 if (err < 0)
3164 return err;
3165
3166 spin_lock_bh(&nf_conntrack_expect_lock);
3167 exp = __nf_ct_expect_find(net, &zone, &tuple);
3168 if (!exp) {
3169 spin_unlock_bh(&nf_conntrack_expect_lock);
3170 err = -ENOENT;
3171 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3172 err = ctnetlink_create_expect(net, &zone, cda, u3,
3173 NETLINK_CB(skb).portid,
3174 nlmsg_report(nlh));
3175 }
3176 return err;
3177 }
3178
3179 err = -EEXIST;
3180 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3181 err = ctnetlink_change_expect(exp, cda);
3182 spin_unlock_bh(&nf_conntrack_expect_lock);
3183
3184 return err;
3185 }
3186
3187 static int
3188 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3189 const struct ip_conntrack_stat *st)
3190 {
3191 struct nlmsghdr *nlh;
3192 struct nfgenmsg *nfmsg;
3193 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3194
3195 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
3196 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3197 if (nlh == NULL)
3198 goto nlmsg_failure;
3199
3200 nfmsg = nlmsg_data(nlh);
3201 nfmsg->nfgen_family = AF_UNSPEC;
3202 nfmsg->version = NFNETLINK_V0;
3203 nfmsg->res_id = htons(cpu);
3204
3205 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3206 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3207 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3208 goto nla_put_failure;
3209
3210 nlmsg_end(skb, nlh);
3211 return skb->len;
3212
3213 nla_put_failure:
3214 nlmsg_failure:
3215 nlmsg_cancel(skb, nlh);
3216 return -1;
3217 }
3218
3219 static int
3220 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3221 {
3222 int cpu;
3223 struct net *net = sock_net(skb->sk);
3224
3225 if (cb->args[0] == nr_cpu_ids)
3226 return 0;
3227
3228 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3229 const struct ip_conntrack_stat *st;
3230
3231 if (!cpu_possible(cpu))
3232 continue;
3233
3234 st = per_cpu_ptr(net->ct.stat, cpu);
3235 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3236 cb->nlh->nlmsg_seq,
3237 cpu, st) < 0)
3238 break;
3239 }
3240 cb->args[0] = cpu;
3241
3242 return skb->len;
3243 }
3244
3245 static int
3246 ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
3247 const struct nlmsghdr *nlh,
3248 const struct nlattr * const cda[])
3249 {
3250 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3251 struct netlink_dump_control c = {
3252 .dump = ctnetlink_exp_stat_cpu_dump,
3253 };
3254 return netlink_dump_start(ctnl, skb, nlh, &c);
3255 }
3256
3257 return 0;
3258 }
3259
3260 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3261 static struct nf_ct_event_notifier ctnl_notifier = {
3262 .fcn = ctnetlink_conntrack_event,
3263 };
3264
3265 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3266 .fcn = ctnetlink_expect_event,
3267 };
3268 #endif
3269
3270 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3271 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3272 .attr_count = CTA_MAX,
3273 .policy = ct_nla_policy },
3274 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3275 .attr_count = CTA_MAX,
3276 .policy = ct_nla_policy },
3277 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3278 .attr_count = CTA_MAX,
3279 .policy = ct_nla_policy },
3280 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3281 .attr_count = CTA_MAX,
3282 .policy = ct_nla_policy },
3283 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3284 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3285 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3286 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3287 };
3288
3289 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3290 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3291 .attr_count = CTA_EXPECT_MAX,
3292 .policy = exp_nla_policy },
3293 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3294 .attr_count = CTA_EXPECT_MAX,
3295 .policy = exp_nla_policy },
3296 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3297 .attr_count = CTA_EXPECT_MAX,
3298 .policy = exp_nla_policy },
3299 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3300 };
3301
3302 static const struct nfnetlink_subsystem ctnl_subsys = {
3303 .name = "conntrack",
3304 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3305 .cb_count = IPCTNL_MSG_MAX,
3306 .cb = ctnl_cb,
3307 };
3308
3309 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3310 .name = "conntrack_expect",
3311 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3312 .cb_count = IPCTNL_MSG_EXP_MAX,
3313 .cb = ctnl_exp_cb,
3314 };
3315
3316 MODULE_ALIAS("ip_conntrack_netlink");
3317 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3318 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3319
3320 static int __net_init ctnetlink_net_init(struct net *net)
3321 {
3322 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3323 int ret;
3324
3325 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3326 if (ret < 0) {
3327 pr_err("ctnetlink_init: cannot register notifier.\n");
3328 goto err_out;
3329 }
3330
3331 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3332 if (ret < 0) {
3333 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3334 goto err_unreg_notifier;
3335 }
3336 #endif
3337 return 0;
3338
3339 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3340 err_unreg_notifier:
3341 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3342 err_out:
3343 return ret;
3344 #endif
3345 }
3346
3347 static void ctnetlink_net_exit(struct net *net)
3348 {
3349 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3350 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3351 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3352 #endif
3353 }
3354
3355 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3356 {
3357 struct net *net;
3358
3359 list_for_each_entry(net, net_exit_list, exit_list)
3360 ctnetlink_net_exit(net);
3361 }
3362
3363 static struct pernet_operations ctnetlink_net_ops = {
3364 .init = ctnetlink_net_init,
3365 .exit_batch = ctnetlink_net_exit_batch,
3366 };
3367
3368 static int __init ctnetlink_init(void)
3369 {
3370 int ret;
3371
3372 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3373 ret = nfnetlink_subsys_register(&ctnl_subsys);
3374 if (ret < 0) {
3375 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3376 goto err_out;
3377 }
3378
3379 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3380 if (ret < 0) {
3381 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3382 goto err_unreg_subsys;
3383 }
3384
3385 ret = register_pernet_subsys(&ctnetlink_net_ops);
3386 if (ret < 0) {
3387 pr_err("ctnetlink_init: cannot register pernet operations\n");
3388 goto err_unreg_exp_subsys;
3389 }
3390 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3391 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3392 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3393 #endif
3394 return 0;
3395
3396 err_unreg_exp_subsys:
3397 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3398 err_unreg_subsys:
3399 nfnetlink_subsys_unregister(&ctnl_subsys);
3400 err_out:
3401 return ret;
3402 }
3403
3404 static void __exit ctnetlink_exit(void)
3405 {
3406 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3407
3408 unregister_pernet_subsys(&ctnetlink_net_ops);
3409 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3410 nfnetlink_subsys_unregister(&ctnl_subsys);
3411 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3412 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3413 #endif
3414 }
3415
3416 module_init(ctnetlink_init);
3417 module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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