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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[mirror_ubuntu-zesty-kernel.git] / net / netfilter / nf_conntrack_netlink.c
1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/security.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
32
33 #include <linux/netfilter.h>
34 #include <net/netlink.h>
35 #include <net/sock.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_core.h>
38 #include <net/netfilter/nf_conntrack_expect.h>
39 #include <net/netfilter/nf_conntrack_helper.h>
40 #include <net/netfilter/nf_conntrack_seqadj.h>
41 #include <net/netfilter/nf_conntrack_l3proto.h>
42 #include <net/netfilter/nf_conntrack_l4proto.h>
43 #include <net/netfilter/nf_conntrack_tuple.h>
44 #include <net/netfilter/nf_conntrack_acct.h>
45 #include <net/netfilter/nf_conntrack_zones.h>
46 #include <net/netfilter/nf_conntrack_timestamp.h>
47 #include <net/netfilter/nf_conntrack_labels.h>
48 #ifdef CONFIG_NF_NAT_NEEDED
49 #include <net/netfilter/nf_nat_core.h>
50 #include <net/netfilter/nf_nat_l4proto.h>
51 #include <net/netfilter/nf_nat_helper.h>
52 #endif
53
54 #include <linux/netfilter/nfnetlink.h>
55 #include <linux/netfilter/nfnetlink_conntrack.h>
56
57 MODULE_LICENSE("GPL");
58
59 static char __initdata version[] = "0.93";
60
61 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
62 const struct nf_conntrack_tuple *tuple,
63 struct nf_conntrack_l4proto *l4proto)
64 {
65 int ret = 0;
66 struct nlattr *nest_parms;
67
68 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
69 if (!nest_parms)
70 goto nla_put_failure;
71 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
72 goto nla_put_failure;
73
74 if (likely(l4proto->tuple_to_nlattr))
75 ret = l4proto->tuple_to_nlattr(skb, tuple);
76
77 nla_nest_end(skb, nest_parms);
78
79 return ret;
80
81 nla_put_failure:
82 return -1;
83 }
84
85 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
86 const struct nf_conntrack_tuple *tuple,
87 struct nf_conntrack_l3proto *l3proto)
88 {
89 int ret = 0;
90 struct nlattr *nest_parms;
91
92 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
93 if (!nest_parms)
94 goto nla_put_failure;
95
96 if (likely(l3proto->tuple_to_nlattr))
97 ret = l3proto->tuple_to_nlattr(skb, tuple);
98
99 nla_nest_end(skb, nest_parms);
100
101 return ret;
102
103 nla_put_failure:
104 return -1;
105 }
106
107 static int ctnetlink_dump_tuples(struct sk_buff *skb,
108 const struct nf_conntrack_tuple *tuple)
109 {
110 int ret;
111 struct nf_conntrack_l3proto *l3proto;
112 struct nf_conntrack_l4proto *l4proto;
113
114 rcu_read_lock();
115 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
116 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
117
118 if (ret >= 0) {
119 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
120 tuple->dst.protonum);
121 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
122 }
123 rcu_read_unlock();
124 return ret;
125 }
126
127 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
128 const struct nf_conntrack_zone *zone, int dir)
129 {
130 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
131 return 0;
132 if (nla_put_be16(skb, attrtype, htons(zone->id)))
133 goto nla_put_failure;
134 return 0;
135
136 nla_put_failure:
137 return -1;
138 }
139
140 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
141 {
142 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
143 goto nla_put_failure;
144 return 0;
145
146 nla_put_failure:
147 return -1;
148 }
149
150 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
151 {
152 long timeout = nf_ct_expires(ct) / HZ;
153
154 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
155 goto nla_put_failure;
156 return 0;
157
158 nla_put_failure:
159 return -1;
160 }
161
162 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
163 {
164 struct nf_conntrack_l4proto *l4proto;
165 struct nlattr *nest_proto;
166 int ret;
167
168 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
169 if (!l4proto->to_nlattr)
170 return 0;
171
172 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
173 if (!nest_proto)
174 goto nla_put_failure;
175
176 ret = l4proto->to_nlattr(skb, nest_proto, ct);
177
178 nla_nest_end(skb, nest_proto);
179
180 return ret;
181
182 nla_put_failure:
183 return -1;
184 }
185
186 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
187 const struct nf_conn *ct)
188 {
189 struct nlattr *nest_helper;
190 const struct nf_conn_help *help = nfct_help(ct);
191 struct nf_conntrack_helper *helper;
192
193 if (!help)
194 return 0;
195
196 helper = rcu_dereference(help->helper);
197 if (!helper)
198 goto out;
199
200 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
201 if (!nest_helper)
202 goto nla_put_failure;
203 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
204 goto nla_put_failure;
205
206 if (helper->to_nlattr)
207 helper->to_nlattr(skb, ct);
208
209 nla_nest_end(skb, nest_helper);
210 out:
211 return 0;
212
213 nla_put_failure:
214 return -1;
215 }
216
217 static int
218 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
219 enum ip_conntrack_dir dir, int type)
220 {
221 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
222 struct nf_conn_counter *counter = acct->counter;
223 struct nlattr *nest_count;
224 u64 pkts, bytes;
225
226 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
227 pkts = atomic64_xchg(&counter[dir].packets, 0);
228 bytes = atomic64_xchg(&counter[dir].bytes, 0);
229 } else {
230 pkts = atomic64_read(&counter[dir].packets);
231 bytes = atomic64_read(&counter[dir].bytes);
232 }
233
234 nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
235 if (!nest_count)
236 goto nla_put_failure;
237
238 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
239 CTA_COUNTERS_PAD) ||
240 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
241 CTA_COUNTERS_PAD))
242 goto nla_put_failure;
243
244 nla_nest_end(skb, nest_count);
245
246 return 0;
247
248 nla_put_failure:
249 return -1;
250 }
251
252 static int
253 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
254 {
255 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
256
257 if (!acct)
258 return 0;
259
260 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
261 return -1;
262 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
263 return -1;
264
265 return 0;
266 }
267
268 static int
269 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
270 {
271 struct nlattr *nest_count;
272 const struct nf_conn_tstamp *tstamp;
273
274 tstamp = nf_conn_tstamp_find(ct);
275 if (!tstamp)
276 return 0;
277
278 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
279 if (!nest_count)
280 goto nla_put_failure;
281
282 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
283 CTA_TIMESTAMP_PAD) ||
284 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
285 cpu_to_be64(tstamp->stop),
286 CTA_TIMESTAMP_PAD)))
287 goto nla_put_failure;
288 nla_nest_end(skb, nest_count);
289
290 return 0;
291
292 nla_put_failure:
293 return -1;
294 }
295
296 #ifdef CONFIG_NF_CONNTRACK_MARK
297 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
298 {
299 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
300 goto nla_put_failure;
301 return 0;
302
303 nla_put_failure:
304 return -1;
305 }
306 #else
307 #define ctnetlink_dump_mark(a, b) (0)
308 #endif
309
310 #ifdef CONFIG_NF_CONNTRACK_SECMARK
311 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
312 {
313 struct nlattr *nest_secctx;
314 int len, ret;
315 char *secctx;
316
317 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
318 if (ret)
319 return 0;
320
321 ret = -1;
322 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
323 if (!nest_secctx)
324 goto nla_put_failure;
325
326 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
327 goto nla_put_failure;
328 nla_nest_end(skb, nest_secctx);
329
330 ret = 0;
331 nla_put_failure:
332 security_release_secctx(secctx, len);
333 return ret;
334 }
335 #else
336 #define ctnetlink_dump_secctx(a, b) (0)
337 #endif
338
339 #ifdef CONFIG_NF_CONNTRACK_LABELS
340 static inline int ctnetlink_label_size(const struct nf_conn *ct)
341 {
342 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
343
344 if (!labels)
345 return 0;
346 return nla_total_size(sizeof(labels->bits));
347 }
348
349 static int
350 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
351 {
352 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
353 unsigned int i;
354
355 if (!labels)
356 return 0;
357
358 i = 0;
359 do {
360 if (labels->bits[i] != 0)
361 return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
362 labels->bits);
363 i++;
364 } while (i < ARRAY_SIZE(labels->bits));
365
366 return 0;
367 }
368 #else
369 #define ctnetlink_dump_labels(a, b) (0)
370 #define ctnetlink_label_size(a) (0)
371 #endif
372
373 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
374
375 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
376 {
377 struct nlattr *nest_parms;
378
379 if (!(ct->status & IPS_EXPECTED))
380 return 0;
381
382 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
383 if (!nest_parms)
384 goto nla_put_failure;
385 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
386 goto nla_put_failure;
387 nla_nest_end(skb, nest_parms);
388
389 return 0;
390
391 nla_put_failure:
392 return -1;
393 }
394
395 static int
396 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
397 {
398 struct nlattr *nest_parms;
399
400 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
401 if (!nest_parms)
402 goto nla_put_failure;
403
404 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
405 htonl(seq->correction_pos)) ||
406 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
407 htonl(seq->offset_before)) ||
408 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
409 htonl(seq->offset_after)))
410 goto nla_put_failure;
411
412 nla_nest_end(skb, nest_parms);
413
414 return 0;
415
416 nla_put_failure:
417 return -1;
418 }
419
420 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb,
421 const struct nf_conn *ct)
422 {
423 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
424 struct nf_ct_seqadj *seq;
425
426 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
427 return 0;
428
429 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
430 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
431 return -1;
432
433 seq = &seqadj->seq[IP_CT_DIR_REPLY];
434 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
435 return -1;
436
437 return 0;
438 }
439
440 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
441 {
442 if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
443 goto nla_put_failure;
444 return 0;
445
446 nla_put_failure:
447 return -1;
448 }
449
450 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
451 {
452 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
453 goto nla_put_failure;
454 return 0;
455
456 nla_put_failure:
457 return -1;
458 }
459
460 static int
461 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
462 struct nf_conn *ct)
463 {
464 const struct nf_conntrack_zone *zone;
465 struct nlmsghdr *nlh;
466 struct nfgenmsg *nfmsg;
467 struct nlattr *nest_parms;
468 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
469
470 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
471 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
472 if (nlh == NULL)
473 goto nlmsg_failure;
474
475 nfmsg = nlmsg_data(nlh);
476 nfmsg->nfgen_family = nf_ct_l3num(ct);
477 nfmsg->version = NFNETLINK_V0;
478 nfmsg->res_id = 0;
479
480 zone = nf_ct_zone(ct);
481
482 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
483 if (!nest_parms)
484 goto nla_put_failure;
485 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
486 goto nla_put_failure;
487 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
488 NF_CT_ZONE_DIR_ORIG) < 0)
489 goto nla_put_failure;
490 nla_nest_end(skb, nest_parms);
491
492 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
493 if (!nest_parms)
494 goto nla_put_failure;
495 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
496 goto nla_put_failure;
497 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
498 NF_CT_ZONE_DIR_REPL) < 0)
499 goto nla_put_failure;
500 nla_nest_end(skb, nest_parms);
501
502 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
503 NF_CT_DEFAULT_ZONE_DIR) < 0)
504 goto nla_put_failure;
505
506 if (ctnetlink_dump_status(skb, ct) < 0 ||
507 ctnetlink_dump_timeout(skb, ct) < 0 ||
508 ctnetlink_dump_acct(skb, ct, type) < 0 ||
509 ctnetlink_dump_timestamp(skb, ct) < 0 ||
510 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
511 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
512 ctnetlink_dump_mark(skb, ct) < 0 ||
513 ctnetlink_dump_secctx(skb, ct) < 0 ||
514 ctnetlink_dump_labels(skb, ct) < 0 ||
515 ctnetlink_dump_id(skb, ct) < 0 ||
516 ctnetlink_dump_use(skb, ct) < 0 ||
517 ctnetlink_dump_master(skb, ct) < 0 ||
518 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
519 goto nla_put_failure;
520
521 nlmsg_end(skb, nlh);
522 return skb->len;
523
524 nlmsg_failure:
525 nla_put_failure:
526 nlmsg_cancel(skb, nlh);
527 return -1;
528 }
529
530 static inline size_t ctnetlink_proto_size(const struct nf_conn *ct)
531 {
532 struct nf_conntrack_l3proto *l3proto;
533 struct nf_conntrack_l4proto *l4proto;
534 size_t len = 0;
535
536 rcu_read_lock();
537 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
538 len += l3proto->nla_size;
539
540 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
541 len += l4proto->nla_size;
542 rcu_read_unlock();
543
544 return len;
545 }
546
547 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
548 {
549 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
550 return 0;
551 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
552 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
553 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
554 ;
555 }
556
557 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
558 {
559 #ifdef CONFIG_NF_CONNTRACK_SECMARK
560 int len, ret;
561
562 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
563 if (ret)
564 return 0;
565
566 return nla_total_size(0) /* CTA_SECCTX */
567 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
568 #else
569 return 0;
570 #endif
571 }
572
573 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
574 {
575 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
576 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
577 return 0;
578 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
579 #else
580 return 0;
581 #endif
582 }
583
584 #ifdef CONFIG_NF_CONNTRACK_EVENTS
585 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
586 {
587 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
588 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
589 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
590 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
591 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
592 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
593 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
594 + ctnetlink_acct_size(ct)
595 + ctnetlink_timestamp_size(ct)
596 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
597 + nla_total_size(0) /* CTA_PROTOINFO */
598 + nla_total_size(0) /* CTA_HELP */
599 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
600 + ctnetlink_secctx_size(ct)
601 #ifdef CONFIG_NF_NAT_NEEDED
602 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
603 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
604 #endif
605 #ifdef CONFIG_NF_CONNTRACK_MARK
606 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
607 #endif
608 #ifdef CONFIG_NF_CONNTRACK_ZONES
609 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
610 #endif
611 + ctnetlink_proto_size(ct)
612 + ctnetlink_label_size(ct)
613 ;
614 }
615
616 static int
617 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
618 {
619 const struct nf_conntrack_zone *zone;
620 struct net *net;
621 struct nlmsghdr *nlh;
622 struct nfgenmsg *nfmsg;
623 struct nlattr *nest_parms;
624 struct nf_conn *ct = item->ct;
625 struct sk_buff *skb;
626 unsigned int type;
627 unsigned int flags = 0, group;
628 int err;
629
630 /* ignore our fake conntrack entry */
631 if (nf_ct_is_untracked(ct))
632 return 0;
633
634 if (events & (1 << IPCT_DESTROY)) {
635 type = IPCTNL_MSG_CT_DELETE;
636 group = NFNLGRP_CONNTRACK_DESTROY;
637 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
638 type = IPCTNL_MSG_CT_NEW;
639 flags = NLM_F_CREATE|NLM_F_EXCL;
640 group = NFNLGRP_CONNTRACK_NEW;
641 } else if (events) {
642 type = IPCTNL_MSG_CT_NEW;
643 group = NFNLGRP_CONNTRACK_UPDATE;
644 } else
645 return 0;
646
647 net = nf_ct_net(ct);
648 if (!item->report && !nfnetlink_has_listeners(net, group))
649 return 0;
650
651 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
652 if (skb == NULL)
653 goto errout;
654
655 type |= NFNL_SUBSYS_CTNETLINK << 8;
656 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
657 if (nlh == NULL)
658 goto nlmsg_failure;
659
660 nfmsg = nlmsg_data(nlh);
661 nfmsg->nfgen_family = nf_ct_l3num(ct);
662 nfmsg->version = NFNETLINK_V0;
663 nfmsg->res_id = 0;
664
665 rcu_read_lock();
666 zone = nf_ct_zone(ct);
667
668 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
669 if (!nest_parms)
670 goto nla_put_failure;
671 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
672 goto nla_put_failure;
673 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
674 NF_CT_ZONE_DIR_ORIG) < 0)
675 goto nla_put_failure;
676 nla_nest_end(skb, nest_parms);
677
678 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
679 if (!nest_parms)
680 goto nla_put_failure;
681 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
682 goto nla_put_failure;
683 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
684 NF_CT_ZONE_DIR_REPL) < 0)
685 goto nla_put_failure;
686 nla_nest_end(skb, nest_parms);
687
688 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
689 NF_CT_DEFAULT_ZONE_DIR) < 0)
690 goto nla_put_failure;
691
692 if (ctnetlink_dump_id(skb, ct) < 0)
693 goto nla_put_failure;
694
695 if (ctnetlink_dump_status(skb, ct) < 0)
696 goto nla_put_failure;
697
698 if (events & (1 << IPCT_DESTROY)) {
699 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
700 ctnetlink_dump_timestamp(skb, ct) < 0)
701 goto nla_put_failure;
702 } else {
703 if (ctnetlink_dump_timeout(skb, ct) < 0)
704 goto nla_put_failure;
705
706 if (events & (1 << IPCT_PROTOINFO)
707 && ctnetlink_dump_protoinfo(skb, ct) < 0)
708 goto nla_put_failure;
709
710 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
711 && ctnetlink_dump_helpinfo(skb, ct) < 0)
712 goto nla_put_failure;
713
714 #ifdef CONFIG_NF_CONNTRACK_SECMARK
715 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
716 && ctnetlink_dump_secctx(skb, ct) < 0)
717 goto nla_put_failure;
718 #endif
719 if (events & (1 << IPCT_LABEL) &&
720 ctnetlink_dump_labels(skb, ct) < 0)
721 goto nla_put_failure;
722
723 if (events & (1 << IPCT_RELATED) &&
724 ctnetlink_dump_master(skb, ct) < 0)
725 goto nla_put_failure;
726
727 if (events & (1 << IPCT_SEQADJ) &&
728 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
729 goto nla_put_failure;
730 }
731
732 #ifdef CONFIG_NF_CONNTRACK_MARK
733 if ((events & (1 << IPCT_MARK) || ct->mark)
734 && ctnetlink_dump_mark(skb, ct) < 0)
735 goto nla_put_failure;
736 #endif
737 rcu_read_unlock();
738
739 nlmsg_end(skb, nlh);
740 err = nfnetlink_send(skb, net, item->portid, group, item->report,
741 GFP_ATOMIC);
742 if (err == -ENOBUFS || err == -EAGAIN)
743 return -ENOBUFS;
744
745 return 0;
746
747 nla_put_failure:
748 rcu_read_unlock();
749 nlmsg_cancel(skb, nlh);
750 nlmsg_failure:
751 kfree_skb(skb);
752 errout:
753 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
754 return -ENOBUFS;
755
756 return 0;
757 }
758 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
759
760 static int ctnetlink_done(struct netlink_callback *cb)
761 {
762 if (cb->args[1])
763 nf_ct_put((struct nf_conn *)cb->args[1]);
764 kfree(cb->data);
765 return 0;
766 }
767
768 struct ctnetlink_filter {
769 struct {
770 u_int32_t val;
771 u_int32_t mask;
772 } mark;
773 };
774
775 static struct ctnetlink_filter *
776 ctnetlink_alloc_filter(const struct nlattr * const cda[])
777 {
778 #ifdef CONFIG_NF_CONNTRACK_MARK
779 struct ctnetlink_filter *filter;
780
781 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
782 if (filter == NULL)
783 return ERR_PTR(-ENOMEM);
784
785 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
786 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
787
788 return filter;
789 #else
790 return ERR_PTR(-EOPNOTSUPP);
791 #endif
792 }
793
794 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
795 {
796 struct ctnetlink_filter *filter = data;
797
798 if (filter == NULL)
799 return 1;
800
801 #ifdef CONFIG_NF_CONNTRACK_MARK
802 if ((ct->mark & filter->mark.mask) == filter->mark.val)
803 return 1;
804 #endif
805
806 return 0;
807 }
808
809 static int
810 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
811 {
812 struct net *net = sock_net(skb->sk);
813 struct nf_conn *ct, *last;
814 struct nf_conntrack_tuple_hash *h;
815 struct hlist_nulls_node *n;
816 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
817 u_int8_t l3proto = nfmsg->nfgen_family;
818 struct nf_conn *nf_ct_evict[8];
819 int res, i;
820 spinlock_t *lockp;
821
822 last = (struct nf_conn *)cb->args[1];
823 i = 0;
824
825 local_bh_disable();
826 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
827 restart:
828 while (i) {
829 i--;
830 if (nf_ct_should_gc(nf_ct_evict[i]))
831 nf_ct_kill(nf_ct_evict[i]);
832 nf_ct_put(nf_ct_evict[i]);
833 }
834
835 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
836 nf_conntrack_lock(lockp);
837 if (cb->args[0] >= nf_conntrack_htable_size) {
838 spin_unlock(lockp);
839 goto out;
840 }
841 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
842 hnnode) {
843 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
844 continue;
845 ct = nf_ct_tuplehash_to_ctrack(h);
846 if (nf_ct_is_expired(ct)) {
847 if (i < ARRAY_SIZE(nf_ct_evict) &&
848 atomic_inc_not_zero(&ct->ct_general.use))
849 nf_ct_evict[i++] = ct;
850 continue;
851 }
852
853 if (!net_eq(net, nf_ct_net(ct)))
854 continue;
855
856 /* Dump entries of a given L3 protocol number.
857 * If it is not specified, ie. l3proto == 0,
858 * then dump everything. */
859 if (l3proto && nf_ct_l3num(ct) != l3proto)
860 continue;
861 if (cb->args[1]) {
862 if (ct != last)
863 continue;
864 cb->args[1] = 0;
865 }
866 if (!ctnetlink_filter_match(ct, cb->data))
867 continue;
868
869 rcu_read_lock();
870 res =
871 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
872 cb->nlh->nlmsg_seq,
873 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
874 ct);
875 rcu_read_unlock();
876 if (res < 0) {
877 nf_conntrack_get(&ct->ct_general);
878 cb->args[1] = (unsigned long)ct;
879 spin_unlock(lockp);
880 goto out;
881 }
882 }
883 spin_unlock(lockp);
884 if (cb->args[1]) {
885 cb->args[1] = 0;
886 goto restart;
887 }
888 }
889 out:
890 local_bh_enable();
891 if (last)
892 nf_ct_put(last);
893
894 while (i) {
895 i--;
896 if (nf_ct_should_gc(nf_ct_evict[i]))
897 nf_ct_kill(nf_ct_evict[i]);
898 nf_ct_put(nf_ct_evict[i]);
899 }
900
901 return skb->len;
902 }
903
904 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
905 struct nf_conntrack_tuple *tuple)
906 {
907 struct nlattr *tb[CTA_IP_MAX+1];
908 struct nf_conntrack_l3proto *l3proto;
909 int ret = 0;
910
911 ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
912 if (ret < 0)
913 return ret;
914
915 rcu_read_lock();
916 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
917
918 if (likely(l3proto->nlattr_to_tuple)) {
919 ret = nla_validate_nested(attr, CTA_IP_MAX,
920 l3proto->nla_policy);
921 if (ret == 0)
922 ret = l3proto->nlattr_to_tuple(tb, tuple);
923 }
924
925 rcu_read_unlock();
926
927 return ret;
928 }
929
930 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
931 [CTA_PROTO_NUM] = { .type = NLA_U8 },
932 };
933
934 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
935 struct nf_conntrack_tuple *tuple)
936 {
937 struct nlattr *tb[CTA_PROTO_MAX+1];
938 struct nf_conntrack_l4proto *l4proto;
939 int ret = 0;
940
941 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
942 if (ret < 0)
943 return ret;
944
945 if (!tb[CTA_PROTO_NUM])
946 return -EINVAL;
947 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
948
949 rcu_read_lock();
950 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
951
952 if (likely(l4proto->nlattr_to_tuple)) {
953 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
954 l4proto->nla_policy);
955 if (ret == 0)
956 ret = l4proto->nlattr_to_tuple(tb, tuple);
957 }
958
959 rcu_read_unlock();
960
961 return ret;
962 }
963
964 static int
965 ctnetlink_parse_zone(const struct nlattr *attr,
966 struct nf_conntrack_zone *zone)
967 {
968 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
969 NF_CT_DEFAULT_ZONE_DIR, 0);
970 #ifdef CONFIG_NF_CONNTRACK_ZONES
971 if (attr)
972 zone->id = ntohs(nla_get_be16(attr));
973 #else
974 if (attr)
975 return -EOPNOTSUPP;
976 #endif
977 return 0;
978 }
979
980 static int
981 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
982 struct nf_conntrack_zone *zone)
983 {
984 int ret;
985
986 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
987 return -EINVAL;
988
989 ret = ctnetlink_parse_zone(attr, zone);
990 if (ret < 0)
991 return ret;
992
993 if (type == CTA_TUPLE_REPLY)
994 zone->dir = NF_CT_ZONE_DIR_REPL;
995 else
996 zone->dir = NF_CT_ZONE_DIR_ORIG;
997
998 return 0;
999 }
1000
1001 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1002 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1003 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1004 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1005 };
1006
1007 static int
1008 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1009 struct nf_conntrack_tuple *tuple,
1010 enum ctattr_type type, u_int8_t l3num,
1011 struct nf_conntrack_zone *zone)
1012 {
1013 struct nlattr *tb[CTA_TUPLE_MAX+1];
1014 int err;
1015
1016 memset(tuple, 0, sizeof(*tuple));
1017
1018 err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
1019 if (err < 0)
1020 return err;
1021
1022 if (!tb[CTA_TUPLE_IP])
1023 return -EINVAL;
1024
1025 tuple->src.l3num = l3num;
1026
1027 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
1028 if (err < 0)
1029 return err;
1030
1031 if (!tb[CTA_TUPLE_PROTO])
1032 return -EINVAL;
1033
1034 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
1035 if (err < 0)
1036 return err;
1037
1038 if (tb[CTA_TUPLE_ZONE]) {
1039 if (!zone)
1040 return -EINVAL;
1041
1042 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1043 type, zone);
1044 if (err < 0)
1045 return err;
1046 }
1047
1048 /* orig and expect tuples get DIR_ORIGINAL */
1049 if (type == CTA_TUPLE_REPLY)
1050 tuple->dst.dir = IP_CT_DIR_REPLY;
1051 else
1052 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1053
1054 return 0;
1055 }
1056
1057 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1058 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1059 .len = NF_CT_HELPER_NAME_LEN - 1 },
1060 };
1061
1062 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1063 struct nlattr **helpinfo)
1064 {
1065 int err;
1066 struct nlattr *tb[CTA_HELP_MAX+1];
1067
1068 err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
1069 if (err < 0)
1070 return err;
1071
1072 if (!tb[CTA_HELP_NAME])
1073 return -EINVAL;
1074
1075 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1076
1077 if (tb[CTA_HELP_INFO])
1078 *helpinfo = tb[CTA_HELP_INFO];
1079
1080 return 0;
1081 }
1082
1083 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1084 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1085 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1086 [CTA_STATUS] = { .type = NLA_U32 },
1087 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1088 [CTA_HELP] = { .type = NLA_NESTED },
1089 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1090 [CTA_TIMEOUT] = { .type = NLA_U32 },
1091 [CTA_MARK] = { .type = NLA_U32 },
1092 [CTA_ID] = { .type = NLA_U32 },
1093 [CTA_NAT_DST] = { .type = NLA_NESTED },
1094 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1095 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1096 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1097 [CTA_ZONE] = { .type = NLA_U16 },
1098 [CTA_MARK_MASK] = { .type = NLA_U32 },
1099 [CTA_LABELS] = { .type = NLA_BINARY,
1100 .len = NF_CT_LABELS_MAX_SIZE },
1101 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1102 .len = NF_CT_LABELS_MAX_SIZE },
1103 };
1104
1105 static int ctnetlink_flush_conntrack(struct net *net,
1106 const struct nlattr * const cda[],
1107 u32 portid, int report)
1108 {
1109 struct ctnetlink_filter *filter = NULL;
1110
1111 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1112 filter = ctnetlink_alloc_filter(cda);
1113 if (IS_ERR(filter))
1114 return PTR_ERR(filter);
1115 }
1116
1117 nf_ct_iterate_cleanup(net, ctnetlink_filter_match, filter,
1118 portid, report);
1119 kfree(filter);
1120
1121 return 0;
1122 }
1123
1124 static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1125 struct sk_buff *skb,
1126 const struct nlmsghdr *nlh,
1127 const struct nlattr * const cda[])
1128 {
1129 struct nf_conntrack_tuple_hash *h;
1130 struct nf_conntrack_tuple tuple;
1131 struct nf_conn *ct;
1132 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1133 u_int8_t u3 = nfmsg->nfgen_family;
1134 struct nf_conntrack_zone zone;
1135 int err;
1136
1137 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1138 if (err < 0)
1139 return err;
1140
1141 if (cda[CTA_TUPLE_ORIG])
1142 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1143 u3, &zone);
1144 else if (cda[CTA_TUPLE_REPLY])
1145 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1146 u3, &zone);
1147 else {
1148 return ctnetlink_flush_conntrack(net, cda,
1149 NETLINK_CB(skb).portid,
1150 nlmsg_report(nlh));
1151 }
1152
1153 if (err < 0)
1154 return err;
1155
1156 h = nf_conntrack_find_get(net, &zone, &tuple);
1157 if (!h)
1158 return -ENOENT;
1159
1160 ct = nf_ct_tuplehash_to_ctrack(h);
1161
1162 if (cda[CTA_ID]) {
1163 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1164 if (id != (u32)(unsigned long)ct) {
1165 nf_ct_put(ct);
1166 return -ENOENT;
1167 }
1168 }
1169
1170 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1171 nf_ct_put(ct);
1172
1173 return 0;
1174 }
1175
1176 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1177 struct sk_buff *skb,
1178 const struct nlmsghdr *nlh,
1179 const struct nlattr * const cda[])
1180 {
1181 struct nf_conntrack_tuple_hash *h;
1182 struct nf_conntrack_tuple tuple;
1183 struct nf_conn *ct;
1184 struct sk_buff *skb2 = NULL;
1185 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1186 u_int8_t u3 = nfmsg->nfgen_family;
1187 struct nf_conntrack_zone zone;
1188 int err;
1189
1190 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1191 struct netlink_dump_control c = {
1192 .dump = ctnetlink_dump_table,
1193 .done = ctnetlink_done,
1194 };
1195
1196 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1197 struct ctnetlink_filter *filter;
1198
1199 filter = ctnetlink_alloc_filter(cda);
1200 if (IS_ERR(filter))
1201 return PTR_ERR(filter);
1202
1203 c.data = filter;
1204 }
1205 return netlink_dump_start(ctnl, skb, nlh, &c);
1206 }
1207
1208 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1209 if (err < 0)
1210 return err;
1211
1212 if (cda[CTA_TUPLE_ORIG])
1213 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1214 u3, &zone);
1215 else if (cda[CTA_TUPLE_REPLY])
1216 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1217 u3, &zone);
1218 else
1219 return -EINVAL;
1220
1221 if (err < 0)
1222 return err;
1223
1224 h = nf_conntrack_find_get(net, &zone, &tuple);
1225 if (!h)
1226 return -ENOENT;
1227
1228 ct = nf_ct_tuplehash_to_ctrack(h);
1229
1230 err = -ENOMEM;
1231 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1232 if (skb2 == NULL) {
1233 nf_ct_put(ct);
1234 return -ENOMEM;
1235 }
1236
1237 rcu_read_lock();
1238 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1239 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1240 rcu_read_unlock();
1241 nf_ct_put(ct);
1242 if (err <= 0)
1243 goto free;
1244
1245 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1246 if (err < 0)
1247 goto out;
1248
1249 return 0;
1250
1251 free:
1252 kfree_skb(skb2);
1253 out:
1254 /* this avoids a loop in nfnetlink. */
1255 return err == -EAGAIN ? -ENOBUFS : err;
1256 }
1257
1258 static int ctnetlink_done_list(struct netlink_callback *cb)
1259 {
1260 if (cb->args[1])
1261 nf_ct_put((struct nf_conn *)cb->args[1]);
1262 return 0;
1263 }
1264
1265 static int
1266 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1267 {
1268 struct nf_conn *ct, *last;
1269 struct nf_conntrack_tuple_hash *h;
1270 struct hlist_nulls_node *n;
1271 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1272 u_int8_t l3proto = nfmsg->nfgen_family;
1273 int res;
1274 int cpu;
1275 struct hlist_nulls_head *list;
1276 struct net *net = sock_net(skb->sk);
1277
1278 if (cb->args[2])
1279 return 0;
1280
1281 last = (struct nf_conn *)cb->args[1];
1282
1283 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1284 struct ct_pcpu *pcpu;
1285
1286 if (!cpu_possible(cpu))
1287 continue;
1288
1289 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1290 spin_lock_bh(&pcpu->lock);
1291 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1292 restart:
1293 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1294 ct = nf_ct_tuplehash_to_ctrack(h);
1295 if (l3proto && nf_ct_l3num(ct) != l3proto)
1296 continue;
1297 if (cb->args[1]) {
1298 if (ct != last)
1299 continue;
1300 cb->args[1] = 0;
1301 }
1302 rcu_read_lock();
1303 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1304 cb->nlh->nlmsg_seq,
1305 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1306 ct);
1307 rcu_read_unlock();
1308 if (res < 0) {
1309 if (!atomic_inc_not_zero(&ct->ct_general.use))
1310 continue;
1311 cb->args[0] = cpu;
1312 cb->args[1] = (unsigned long)ct;
1313 spin_unlock_bh(&pcpu->lock);
1314 goto out;
1315 }
1316 }
1317 if (cb->args[1]) {
1318 cb->args[1] = 0;
1319 goto restart;
1320 }
1321 spin_unlock_bh(&pcpu->lock);
1322 }
1323 cb->args[2] = 1;
1324 out:
1325 if (last)
1326 nf_ct_put(last);
1327
1328 return skb->len;
1329 }
1330
1331 static int
1332 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1333 {
1334 return ctnetlink_dump_list(skb, cb, true);
1335 }
1336
1337 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1338 struct sk_buff *skb,
1339 const struct nlmsghdr *nlh,
1340 const struct nlattr * const cda[])
1341 {
1342 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1343 struct netlink_dump_control c = {
1344 .dump = ctnetlink_dump_dying,
1345 .done = ctnetlink_done_list,
1346 };
1347 return netlink_dump_start(ctnl, skb, nlh, &c);
1348 }
1349
1350 return -EOPNOTSUPP;
1351 }
1352
1353 static int
1354 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1355 {
1356 return ctnetlink_dump_list(skb, cb, false);
1357 }
1358
1359 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1360 struct sk_buff *skb,
1361 const struct nlmsghdr *nlh,
1362 const struct nlattr * const cda[])
1363 {
1364 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1365 struct netlink_dump_control c = {
1366 .dump = ctnetlink_dump_unconfirmed,
1367 .done = ctnetlink_done_list,
1368 };
1369 return netlink_dump_start(ctnl, skb, nlh, &c);
1370 }
1371
1372 return -EOPNOTSUPP;
1373 }
1374
1375 #ifdef CONFIG_NF_NAT_NEEDED
1376 static int
1377 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1378 enum nf_nat_manip_type manip,
1379 const struct nlattr *attr)
1380 {
1381 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1382 int err;
1383
1384 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1385 if (!parse_nat_setup) {
1386 #ifdef CONFIG_MODULES
1387 rcu_read_unlock();
1388 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1389 if (request_module("nf-nat") < 0) {
1390 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1391 rcu_read_lock();
1392 return -EOPNOTSUPP;
1393 }
1394 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1395 rcu_read_lock();
1396 if (nfnetlink_parse_nat_setup_hook)
1397 return -EAGAIN;
1398 #endif
1399 return -EOPNOTSUPP;
1400 }
1401
1402 err = parse_nat_setup(ct, manip, attr);
1403 if (err == -EAGAIN) {
1404 #ifdef CONFIG_MODULES
1405 rcu_read_unlock();
1406 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1407 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1408 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1409 rcu_read_lock();
1410 return -EOPNOTSUPP;
1411 }
1412 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1413 rcu_read_lock();
1414 #else
1415 err = -EOPNOTSUPP;
1416 #endif
1417 }
1418 return err;
1419 }
1420 #endif
1421
1422 static int
1423 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1424 {
1425 unsigned long d;
1426 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1427 d = ct->status ^ status;
1428
1429 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1430 /* unchangeable */
1431 return -EBUSY;
1432
1433 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1434 /* SEEN_REPLY bit can only be set */
1435 return -EBUSY;
1436
1437 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1438 /* ASSURED bit can only be set */
1439 return -EBUSY;
1440
1441 /* Be careful here, modifying NAT bits can screw up things,
1442 * so don't let users modify them directly if they don't pass
1443 * nf_nat_range. */
1444 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1445 return 0;
1446 }
1447
1448 static int
1449 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1450 {
1451 #ifdef CONFIG_NF_NAT_NEEDED
1452 int ret;
1453
1454 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1455 return 0;
1456
1457 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1458 cda[CTA_NAT_DST]);
1459 if (ret < 0)
1460 return ret;
1461
1462 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1463 cda[CTA_NAT_SRC]);
1464 return ret;
1465 #else
1466 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1467 return 0;
1468 return -EOPNOTSUPP;
1469 #endif
1470 }
1471
1472 static int ctnetlink_change_helper(struct nf_conn *ct,
1473 const struct nlattr * const cda[])
1474 {
1475 struct nf_conntrack_helper *helper;
1476 struct nf_conn_help *help = nfct_help(ct);
1477 char *helpname = NULL;
1478 struct nlattr *helpinfo = NULL;
1479 int err;
1480
1481 /* don't change helper of sibling connections */
1482 if (ct->master)
1483 return -EBUSY;
1484
1485 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1486 if (err < 0)
1487 return err;
1488
1489 if (!strcmp(helpname, "")) {
1490 if (help && help->helper) {
1491 /* we had a helper before ... */
1492 nf_ct_remove_expectations(ct);
1493 RCU_INIT_POINTER(help->helper, NULL);
1494 }
1495
1496 return 0;
1497 }
1498
1499 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1500 nf_ct_protonum(ct));
1501 if (helper == NULL) {
1502 #ifdef CONFIG_MODULES
1503 spin_unlock_bh(&nf_conntrack_expect_lock);
1504
1505 if (request_module("nfct-helper-%s", helpname) < 0) {
1506 spin_lock_bh(&nf_conntrack_expect_lock);
1507 return -EOPNOTSUPP;
1508 }
1509
1510 spin_lock_bh(&nf_conntrack_expect_lock);
1511 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1512 nf_ct_protonum(ct));
1513 if (helper)
1514 return -EAGAIN;
1515 #endif
1516 return -EOPNOTSUPP;
1517 }
1518
1519 if (help) {
1520 if (help->helper == helper) {
1521 /* update private helper data if allowed. */
1522 if (helper->from_nlattr)
1523 helper->from_nlattr(helpinfo, ct);
1524 return 0;
1525 } else
1526 return -EBUSY;
1527 }
1528
1529 /* we cannot set a helper for an existing conntrack */
1530 return -EOPNOTSUPP;
1531 }
1532
1533 static int ctnetlink_change_timeout(struct nf_conn *ct,
1534 const struct nlattr * const cda[])
1535 {
1536 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1537
1538 ct->timeout = nfct_time_stamp + timeout * HZ;
1539
1540 if (test_bit(IPS_DYING_BIT, &ct->status))
1541 return -ETIME;
1542
1543 return 0;
1544 }
1545
1546 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1547 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1548 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1549 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1550 };
1551
1552 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
1553 const struct nlattr * const cda[])
1554 {
1555 const struct nlattr *attr = cda[CTA_PROTOINFO];
1556 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1557 struct nf_conntrack_l4proto *l4proto;
1558 int err = 0;
1559
1560 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1561 if (err < 0)
1562 return err;
1563
1564 rcu_read_lock();
1565 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1566 if (l4proto->from_nlattr)
1567 err = l4proto->from_nlattr(tb, ct);
1568 rcu_read_unlock();
1569
1570 return err;
1571 }
1572
1573 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1574 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1575 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1576 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1577 };
1578
1579 static int change_seq_adj(struct nf_ct_seqadj *seq,
1580 const struct nlattr * const attr)
1581 {
1582 int err;
1583 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1584
1585 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1586 if (err < 0)
1587 return err;
1588
1589 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1590 return -EINVAL;
1591
1592 seq->correction_pos =
1593 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1594
1595 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1596 return -EINVAL;
1597
1598 seq->offset_before =
1599 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1600
1601 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1602 return -EINVAL;
1603
1604 seq->offset_after =
1605 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1606
1607 return 0;
1608 }
1609
1610 static int
1611 ctnetlink_change_seq_adj(struct nf_conn *ct,
1612 const struct nlattr * const cda[])
1613 {
1614 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1615 int ret = 0;
1616
1617 if (!seqadj)
1618 return 0;
1619
1620 if (cda[CTA_SEQ_ADJ_ORIG]) {
1621 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1622 cda[CTA_SEQ_ADJ_ORIG]);
1623 if (ret < 0)
1624 return ret;
1625
1626 ct->status |= IPS_SEQ_ADJUST;
1627 }
1628
1629 if (cda[CTA_SEQ_ADJ_REPLY]) {
1630 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1631 cda[CTA_SEQ_ADJ_REPLY]);
1632 if (ret < 0)
1633 return ret;
1634
1635 ct->status |= IPS_SEQ_ADJUST;
1636 }
1637
1638 return 0;
1639 }
1640
1641 static int
1642 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1643 {
1644 #ifdef CONFIG_NF_CONNTRACK_LABELS
1645 size_t len = nla_len(cda[CTA_LABELS]);
1646 const void *mask = cda[CTA_LABELS_MASK];
1647
1648 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1649 return -EINVAL;
1650
1651 if (mask) {
1652 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1653 nla_len(cda[CTA_LABELS_MASK]) != len)
1654 return -EINVAL;
1655 mask = nla_data(cda[CTA_LABELS_MASK]);
1656 }
1657
1658 len /= sizeof(u32);
1659
1660 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1661 #else
1662 return -EOPNOTSUPP;
1663 #endif
1664 }
1665
1666 static int
1667 ctnetlink_change_conntrack(struct nf_conn *ct,
1668 const struct nlattr * const cda[])
1669 {
1670 int err;
1671
1672 /* only allow NAT changes and master assignation for new conntracks */
1673 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1674 return -EOPNOTSUPP;
1675
1676 if (cda[CTA_HELP]) {
1677 err = ctnetlink_change_helper(ct, cda);
1678 if (err < 0)
1679 return err;
1680 }
1681
1682 if (cda[CTA_TIMEOUT]) {
1683 err = ctnetlink_change_timeout(ct, cda);
1684 if (err < 0)
1685 return err;
1686 }
1687
1688 if (cda[CTA_STATUS]) {
1689 err = ctnetlink_change_status(ct, cda);
1690 if (err < 0)
1691 return err;
1692 }
1693
1694 if (cda[CTA_PROTOINFO]) {
1695 err = ctnetlink_change_protoinfo(ct, cda);
1696 if (err < 0)
1697 return err;
1698 }
1699
1700 #if defined(CONFIG_NF_CONNTRACK_MARK)
1701 if (cda[CTA_MARK])
1702 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1703 #endif
1704
1705 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1706 err = ctnetlink_change_seq_adj(ct, cda);
1707 if (err < 0)
1708 return err;
1709 }
1710
1711 if (cda[CTA_LABELS]) {
1712 err = ctnetlink_attach_labels(ct, cda);
1713 if (err < 0)
1714 return err;
1715 }
1716
1717 return 0;
1718 }
1719
1720 static struct nf_conn *
1721 ctnetlink_create_conntrack(struct net *net,
1722 const struct nf_conntrack_zone *zone,
1723 const struct nlattr * const cda[],
1724 struct nf_conntrack_tuple *otuple,
1725 struct nf_conntrack_tuple *rtuple,
1726 u8 u3)
1727 {
1728 struct nf_conn *ct;
1729 int err = -EINVAL;
1730 struct nf_conntrack_helper *helper;
1731 struct nf_conn_tstamp *tstamp;
1732
1733 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1734 if (IS_ERR(ct))
1735 return ERR_PTR(-ENOMEM);
1736
1737 if (!cda[CTA_TIMEOUT])
1738 goto err1;
1739
1740 ct->timeout = nfct_time_stamp + ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1741
1742 rcu_read_lock();
1743 if (cda[CTA_HELP]) {
1744 char *helpname = NULL;
1745 struct nlattr *helpinfo = NULL;
1746
1747 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1748 if (err < 0)
1749 goto err2;
1750
1751 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1752 nf_ct_protonum(ct));
1753 if (helper == NULL) {
1754 rcu_read_unlock();
1755 #ifdef CONFIG_MODULES
1756 if (request_module("nfct-helper-%s", helpname) < 0) {
1757 err = -EOPNOTSUPP;
1758 goto err1;
1759 }
1760
1761 rcu_read_lock();
1762 helper = __nf_conntrack_helper_find(helpname,
1763 nf_ct_l3num(ct),
1764 nf_ct_protonum(ct));
1765 if (helper) {
1766 err = -EAGAIN;
1767 goto err2;
1768 }
1769 rcu_read_unlock();
1770 #endif
1771 err = -EOPNOTSUPP;
1772 goto err1;
1773 } else {
1774 struct nf_conn_help *help;
1775
1776 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1777 if (help == NULL) {
1778 err = -ENOMEM;
1779 goto err2;
1780 }
1781 /* set private helper data if allowed. */
1782 if (helper->from_nlattr)
1783 helper->from_nlattr(helpinfo, ct);
1784
1785 /* not in hash table yet so not strictly necessary */
1786 RCU_INIT_POINTER(help->helper, helper);
1787 }
1788 } else {
1789 /* try an implicit helper assignation */
1790 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1791 if (err < 0)
1792 goto err2;
1793 }
1794
1795 err = ctnetlink_setup_nat(ct, cda);
1796 if (err < 0)
1797 goto err2;
1798
1799 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1800 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1801 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1802 nf_ct_labels_ext_add(ct);
1803
1804 /* we must add conntrack extensions before confirmation. */
1805 ct->status |= IPS_CONFIRMED;
1806
1807 if (cda[CTA_STATUS]) {
1808 err = ctnetlink_change_status(ct, cda);
1809 if (err < 0)
1810 goto err2;
1811 }
1812
1813 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1814 err = ctnetlink_change_seq_adj(ct, cda);
1815 if (err < 0)
1816 goto err2;
1817 }
1818
1819 memset(&ct->proto, 0, sizeof(ct->proto));
1820 if (cda[CTA_PROTOINFO]) {
1821 err = ctnetlink_change_protoinfo(ct, cda);
1822 if (err < 0)
1823 goto err2;
1824 }
1825
1826 #if defined(CONFIG_NF_CONNTRACK_MARK)
1827 if (cda[CTA_MARK])
1828 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1829 #endif
1830
1831 /* setup master conntrack: this is a confirmed expectation */
1832 if (cda[CTA_TUPLE_MASTER]) {
1833 struct nf_conntrack_tuple master;
1834 struct nf_conntrack_tuple_hash *master_h;
1835 struct nf_conn *master_ct;
1836
1837 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
1838 u3, NULL);
1839 if (err < 0)
1840 goto err2;
1841
1842 master_h = nf_conntrack_find_get(net, zone, &master);
1843 if (master_h == NULL) {
1844 err = -ENOENT;
1845 goto err2;
1846 }
1847 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1848 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1849 ct->master = master_ct;
1850 }
1851 tstamp = nf_conn_tstamp_find(ct);
1852 if (tstamp)
1853 tstamp->start = ktime_get_real_ns();
1854
1855 err = nf_conntrack_hash_check_insert(ct);
1856 if (err < 0)
1857 goto err2;
1858
1859 rcu_read_unlock();
1860
1861 return ct;
1862
1863 err2:
1864 rcu_read_unlock();
1865 err1:
1866 nf_conntrack_free(ct);
1867 return ERR_PTR(err);
1868 }
1869
1870 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
1871 struct sk_buff *skb,
1872 const struct nlmsghdr *nlh,
1873 const struct nlattr * const cda[])
1874 {
1875 struct nf_conntrack_tuple otuple, rtuple;
1876 struct nf_conntrack_tuple_hash *h = NULL;
1877 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1878 struct nf_conn *ct;
1879 u_int8_t u3 = nfmsg->nfgen_family;
1880 struct nf_conntrack_zone zone;
1881 int err;
1882
1883 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1884 if (err < 0)
1885 return err;
1886
1887 if (cda[CTA_TUPLE_ORIG]) {
1888 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
1889 u3, &zone);
1890 if (err < 0)
1891 return err;
1892 }
1893
1894 if (cda[CTA_TUPLE_REPLY]) {
1895 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
1896 u3, &zone);
1897 if (err < 0)
1898 return err;
1899 }
1900
1901 if (cda[CTA_TUPLE_ORIG])
1902 h = nf_conntrack_find_get(net, &zone, &otuple);
1903 else if (cda[CTA_TUPLE_REPLY])
1904 h = nf_conntrack_find_get(net, &zone, &rtuple);
1905
1906 if (h == NULL) {
1907 err = -ENOENT;
1908 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1909 enum ip_conntrack_events events;
1910
1911 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1912 return -EINVAL;
1913 if (otuple.dst.protonum != rtuple.dst.protonum)
1914 return -EINVAL;
1915
1916 ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
1917 &rtuple, u3);
1918 if (IS_ERR(ct))
1919 return PTR_ERR(ct);
1920
1921 err = 0;
1922 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1923 events = IPCT_RELATED;
1924 else
1925 events = IPCT_NEW;
1926
1927 if (cda[CTA_LABELS] &&
1928 ctnetlink_attach_labels(ct, cda) == 0)
1929 events |= (1 << IPCT_LABEL);
1930
1931 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1932 (1 << IPCT_ASSURED) |
1933 (1 << IPCT_HELPER) |
1934 (1 << IPCT_PROTOINFO) |
1935 (1 << IPCT_SEQADJ) |
1936 (1 << IPCT_MARK) | events,
1937 ct, NETLINK_CB(skb).portid,
1938 nlmsg_report(nlh));
1939 nf_ct_put(ct);
1940 }
1941
1942 return err;
1943 }
1944 /* implicit 'else' */
1945
1946 err = -EEXIST;
1947 ct = nf_ct_tuplehash_to_ctrack(h);
1948 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1949 spin_lock_bh(&nf_conntrack_expect_lock);
1950 err = ctnetlink_change_conntrack(ct, cda);
1951 spin_unlock_bh(&nf_conntrack_expect_lock);
1952 if (err == 0) {
1953 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1954 (1 << IPCT_ASSURED) |
1955 (1 << IPCT_HELPER) |
1956 (1 << IPCT_LABEL) |
1957 (1 << IPCT_PROTOINFO) |
1958 (1 << IPCT_SEQADJ) |
1959 (1 << IPCT_MARK),
1960 ct, NETLINK_CB(skb).portid,
1961 nlmsg_report(nlh));
1962 }
1963 }
1964
1965 nf_ct_put(ct);
1966 return err;
1967 }
1968
1969 static int
1970 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1971 __u16 cpu, const struct ip_conntrack_stat *st)
1972 {
1973 struct nlmsghdr *nlh;
1974 struct nfgenmsg *nfmsg;
1975 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1976
1977 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1978 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1979 if (nlh == NULL)
1980 goto nlmsg_failure;
1981
1982 nfmsg = nlmsg_data(nlh);
1983 nfmsg->nfgen_family = AF_UNSPEC;
1984 nfmsg->version = NFNETLINK_V0;
1985 nfmsg->res_id = htons(cpu);
1986
1987 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1988 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1989 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1990 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1991 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1992 htonl(st->insert_failed)) ||
1993 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1994 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1995 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1996 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1997 htonl(st->search_restart)))
1998 goto nla_put_failure;
1999
2000 nlmsg_end(skb, nlh);
2001 return skb->len;
2002
2003 nla_put_failure:
2004 nlmsg_failure:
2005 nlmsg_cancel(skb, nlh);
2006 return -1;
2007 }
2008
2009 static int
2010 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2011 {
2012 int cpu;
2013 struct net *net = sock_net(skb->sk);
2014
2015 if (cb->args[0] == nr_cpu_ids)
2016 return 0;
2017
2018 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2019 const struct ip_conntrack_stat *st;
2020
2021 if (!cpu_possible(cpu))
2022 continue;
2023
2024 st = per_cpu_ptr(net->ct.stat, cpu);
2025 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2026 NETLINK_CB(cb->skb).portid,
2027 cb->nlh->nlmsg_seq,
2028 cpu, st) < 0)
2029 break;
2030 }
2031 cb->args[0] = cpu;
2032
2033 return skb->len;
2034 }
2035
2036 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2037 struct sk_buff *skb,
2038 const struct nlmsghdr *nlh,
2039 const struct nlattr * const cda[])
2040 {
2041 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2042 struct netlink_dump_control c = {
2043 .dump = ctnetlink_ct_stat_cpu_dump,
2044 };
2045 return netlink_dump_start(ctnl, skb, nlh, &c);
2046 }
2047
2048 return 0;
2049 }
2050
2051 static int
2052 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2053 struct net *net)
2054 {
2055 struct nlmsghdr *nlh;
2056 struct nfgenmsg *nfmsg;
2057 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2058 unsigned int nr_conntracks = atomic_read(&net->ct.count);
2059
2060 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
2061 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2062 if (nlh == NULL)
2063 goto nlmsg_failure;
2064
2065 nfmsg = nlmsg_data(nlh);
2066 nfmsg->nfgen_family = AF_UNSPEC;
2067 nfmsg->version = NFNETLINK_V0;
2068 nfmsg->res_id = 0;
2069
2070 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2071 goto nla_put_failure;
2072
2073 nlmsg_end(skb, nlh);
2074 return skb->len;
2075
2076 nla_put_failure:
2077 nlmsg_failure:
2078 nlmsg_cancel(skb, nlh);
2079 return -1;
2080 }
2081
2082 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2083 struct sk_buff *skb, const struct nlmsghdr *nlh,
2084 const struct nlattr * const cda[])
2085 {
2086 struct sk_buff *skb2;
2087 int err;
2088
2089 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2090 if (skb2 == NULL)
2091 return -ENOMEM;
2092
2093 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2094 nlh->nlmsg_seq,
2095 NFNL_MSG_TYPE(nlh->nlmsg_type),
2096 sock_net(skb->sk));
2097 if (err <= 0)
2098 goto free;
2099
2100 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2101 if (err < 0)
2102 goto out;
2103
2104 return 0;
2105
2106 free:
2107 kfree_skb(skb2);
2108 out:
2109 /* this avoids a loop in nfnetlink. */
2110 return err == -EAGAIN ? -ENOBUFS : err;
2111 }
2112
2113 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2114 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2115 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2116 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2117 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2118 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2119 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2120 .len = NF_CT_HELPER_NAME_LEN - 1 },
2121 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2122 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2123 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2124 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2125 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2126 };
2127
2128 static struct nf_conntrack_expect *
2129 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2130 struct nf_conntrack_helper *helper,
2131 struct nf_conntrack_tuple *tuple,
2132 struct nf_conntrack_tuple *mask);
2133
2134 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2135 static size_t
2136 ctnetlink_glue_build_size(const struct nf_conn *ct)
2137 {
2138 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2139 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2140 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2141 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2142 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2143 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2144 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2145 + nla_total_size(0) /* CTA_PROTOINFO */
2146 + nla_total_size(0) /* CTA_HELP */
2147 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2148 + ctnetlink_secctx_size(ct)
2149 #ifdef CONFIG_NF_NAT_NEEDED
2150 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2151 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2152 #endif
2153 #ifdef CONFIG_NF_CONNTRACK_MARK
2154 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2155 #endif
2156 #ifdef CONFIG_NF_CONNTRACK_ZONES
2157 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2158 #endif
2159 + ctnetlink_proto_size(ct)
2160 ;
2161 }
2162
2163 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2164 enum ip_conntrack_info *ctinfo)
2165 {
2166 struct nf_conn *ct;
2167
2168 ct = nf_ct_get(skb, ctinfo);
2169 if (ct && nf_ct_is_untracked(ct))
2170 ct = NULL;
2171
2172 return ct;
2173 }
2174
2175 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2176 {
2177 const struct nf_conntrack_zone *zone;
2178 struct nlattr *nest_parms;
2179
2180 rcu_read_lock();
2181 zone = nf_ct_zone(ct);
2182
2183 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2184 if (!nest_parms)
2185 goto nla_put_failure;
2186 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2187 goto nla_put_failure;
2188 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2189 NF_CT_ZONE_DIR_ORIG) < 0)
2190 goto nla_put_failure;
2191 nla_nest_end(skb, nest_parms);
2192
2193 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2194 if (!nest_parms)
2195 goto nla_put_failure;
2196 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2197 goto nla_put_failure;
2198 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2199 NF_CT_ZONE_DIR_REPL) < 0)
2200 goto nla_put_failure;
2201 nla_nest_end(skb, nest_parms);
2202
2203 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2204 NF_CT_DEFAULT_ZONE_DIR) < 0)
2205 goto nla_put_failure;
2206
2207 if (ctnetlink_dump_id(skb, ct) < 0)
2208 goto nla_put_failure;
2209
2210 if (ctnetlink_dump_status(skb, ct) < 0)
2211 goto nla_put_failure;
2212
2213 if (ctnetlink_dump_timeout(skb, ct) < 0)
2214 goto nla_put_failure;
2215
2216 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2217 goto nla_put_failure;
2218
2219 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2220 goto nla_put_failure;
2221
2222 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2223 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2224 goto nla_put_failure;
2225 #endif
2226 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2227 goto nla_put_failure;
2228
2229 if ((ct->status & IPS_SEQ_ADJUST) &&
2230 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2231 goto nla_put_failure;
2232
2233 #ifdef CONFIG_NF_CONNTRACK_MARK
2234 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2235 goto nla_put_failure;
2236 #endif
2237 if (ctnetlink_dump_labels(skb, ct) < 0)
2238 goto nla_put_failure;
2239 rcu_read_unlock();
2240 return 0;
2241
2242 nla_put_failure:
2243 rcu_read_unlock();
2244 return -ENOSPC;
2245 }
2246
2247 static int
2248 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2249 enum ip_conntrack_info ctinfo,
2250 u_int16_t ct_attr, u_int16_t ct_info_attr)
2251 {
2252 struct nlattr *nest_parms;
2253
2254 nest_parms = nla_nest_start(skb, ct_attr | NLA_F_NESTED);
2255 if (!nest_parms)
2256 goto nla_put_failure;
2257
2258 if (__ctnetlink_glue_build(skb, ct) < 0)
2259 goto nla_put_failure;
2260
2261 nla_nest_end(skb, nest_parms);
2262
2263 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2264 goto nla_put_failure;
2265
2266 return 0;
2267
2268 nla_put_failure:
2269 return -ENOSPC;
2270 }
2271
2272 static int
2273 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2274 {
2275 int err;
2276
2277 if (cda[CTA_TIMEOUT]) {
2278 err = ctnetlink_change_timeout(ct, cda);
2279 if (err < 0)
2280 return err;
2281 }
2282 if (cda[CTA_STATUS]) {
2283 err = ctnetlink_change_status(ct, cda);
2284 if (err < 0)
2285 return err;
2286 }
2287 if (cda[CTA_HELP]) {
2288 err = ctnetlink_change_helper(ct, cda);
2289 if (err < 0)
2290 return err;
2291 }
2292 if (cda[CTA_LABELS]) {
2293 err = ctnetlink_attach_labels(ct, cda);
2294 if (err < 0)
2295 return err;
2296 }
2297 #if defined(CONFIG_NF_CONNTRACK_MARK)
2298 if (cda[CTA_MARK]) {
2299 u32 mask = 0, mark, newmark;
2300 if (cda[CTA_MARK_MASK])
2301 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2302
2303 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2304 newmark = (ct->mark & mask) ^ mark;
2305 if (newmark != ct->mark)
2306 ct->mark = newmark;
2307 }
2308 #endif
2309 return 0;
2310 }
2311
2312 static int
2313 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2314 {
2315 struct nlattr *cda[CTA_MAX+1];
2316 int ret;
2317
2318 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2319 if (ret < 0)
2320 return ret;
2321
2322 spin_lock_bh(&nf_conntrack_expect_lock);
2323 ret = ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2324 spin_unlock_bh(&nf_conntrack_expect_lock);
2325
2326 return ret;
2327 }
2328
2329 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2330 const struct nf_conn *ct,
2331 struct nf_conntrack_tuple *tuple,
2332 struct nf_conntrack_tuple *mask)
2333 {
2334 int err;
2335
2336 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2337 nf_ct_l3num(ct), NULL);
2338 if (err < 0)
2339 return err;
2340
2341 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2342 nf_ct_l3num(ct), NULL);
2343 }
2344
2345 static int
2346 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2347 u32 portid, u32 report)
2348 {
2349 struct nlattr *cda[CTA_EXPECT_MAX+1];
2350 struct nf_conntrack_tuple tuple, mask;
2351 struct nf_conntrack_helper *helper = NULL;
2352 struct nf_conntrack_expect *exp;
2353 int err;
2354
2355 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2356 if (err < 0)
2357 return err;
2358
2359 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2360 ct, &tuple, &mask);
2361 if (err < 0)
2362 return err;
2363
2364 if (cda[CTA_EXPECT_HELP_NAME]) {
2365 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2366
2367 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2368 nf_ct_protonum(ct));
2369 if (helper == NULL)
2370 return -EOPNOTSUPP;
2371 }
2372
2373 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2374 helper, &tuple, &mask);
2375 if (IS_ERR(exp))
2376 return PTR_ERR(exp);
2377
2378 err = nf_ct_expect_related_report(exp, portid, report);
2379 nf_ct_expect_put(exp);
2380 return err;
2381 }
2382
2383 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2384 enum ip_conntrack_info ctinfo, int diff)
2385 {
2386 if (!(ct->status & IPS_NAT_MASK))
2387 return;
2388
2389 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2390 }
2391
2392 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2393 .get_ct = ctnetlink_glue_get_ct,
2394 .build_size = ctnetlink_glue_build_size,
2395 .build = ctnetlink_glue_build,
2396 .parse = ctnetlink_glue_parse,
2397 .attach_expect = ctnetlink_glue_attach_expect,
2398 .seq_adjust = ctnetlink_glue_seqadj,
2399 };
2400 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2401
2402 /***********************************************************************
2403 * EXPECT
2404 ***********************************************************************/
2405
2406 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2407 const struct nf_conntrack_tuple *tuple,
2408 enum ctattr_expect type)
2409 {
2410 struct nlattr *nest_parms;
2411
2412 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2413 if (!nest_parms)
2414 goto nla_put_failure;
2415 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2416 goto nla_put_failure;
2417 nla_nest_end(skb, nest_parms);
2418
2419 return 0;
2420
2421 nla_put_failure:
2422 return -1;
2423 }
2424
2425 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2426 const struct nf_conntrack_tuple *tuple,
2427 const struct nf_conntrack_tuple_mask *mask)
2428 {
2429 int ret;
2430 struct nf_conntrack_l3proto *l3proto;
2431 struct nf_conntrack_l4proto *l4proto;
2432 struct nf_conntrack_tuple m;
2433 struct nlattr *nest_parms;
2434
2435 memset(&m, 0xFF, sizeof(m));
2436 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2437 m.src.u.all = mask->src.u.all;
2438 m.dst.protonum = tuple->dst.protonum;
2439
2440 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2441 if (!nest_parms)
2442 goto nla_put_failure;
2443
2444 rcu_read_lock();
2445 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2446 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2447 if (ret >= 0) {
2448 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2449 tuple->dst.protonum);
2450 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2451 }
2452 rcu_read_unlock();
2453
2454 if (unlikely(ret < 0))
2455 goto nla_put_failure;
2456
2457 nla_nest_end(skb, nest_parms);
2458
2459 return 0;
2460
2461 nla_put_failure:
2462 return -1;
2463 }
2464
2465 static const union nf_inet_addr any_addr;
2466
2467 static int
2468 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2469 const struct nf_conntrack_expect *exp)
2470 {
2471 struct nf_conn *master = exp->master;
2472 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2473 struct nf_conn_help *help;
2474 #ifdef CONFIG_NF_NAT_NEEDED
2475 struct nlattr *nest_parms;
2476 struct nf_conntrack_tuple nat_tuple = {};
2477 #endif
2478 struct nf_ct_helper_expectfn *expfn;
2479
2480 if (timeout < 0)
2481 timeout = 0;
2482
2483 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2484 goto nla_put_failure;
2485 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2486 goto nla_put_failure;
2487 if (ctnetlink_exp_dump_tuple(skb,
2488 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2489 CTA_EXPECT_MASTER) < 0)
2490 goto nla_put_failure;
2491
2492 #ifdef CONFIG_NF_NAT_NEEDED
2493 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2494 exp->saved_proto.all) {
2495 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2496 if (!nest_parms)
2497 goto nla_put_failure;
2498
2499 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2500 goto nla_put_failure;
2501
2502 nat_tuple.src.l3num = nf_ct_l3num(master);
2503 nat_tuple.src.u3 = exp->saved_addr;
2504 nat_tuple.dst.protonum = nf_ct_protonum(master);
2505 nat_tuple.src.u = exp->saved_proto;
2506
2507 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2508 CTA_EXPECT_NAT_TUPLE) < 0)
2509 goto nla_put_failure;
2510 nla_nest_end(skb, nest_parms);
2511 }
2512 #endif
2513 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2514 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2515 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2516 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2517 goto nla_put_failure;
2518 help = nfct_help(master);
2519 if (help) {
2520 struct nf_conntrack_helper *helper;
2521
2522 helper = rcu_dereference(help->helper);
2523 if (helper &&
2524 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2525 goto nla_put_failure;
2526 }
2527 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2528 if (expfn != NULL &&
2529 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2530 goto nla_put_failure;
2531
2532 return 0;
2533
2534 nla_put_failure:
2535 return -1;
2536 }
2537
2538 static int
2539 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2540 int event, const struct nf_conntrack_expect *exp)
2541 {
2542 struct nlmsghdr *nlh;
2543 struct nfgenmsg *nfmsg;
2544 unsigned int flags = portid ? NLM_F_MULTI : 0;
2545
2546 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2547 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2548 if (nlh == NULL)
2549 goto nlmsg_failure;
2550
2551 nfmsg = nlmsg_data(nlh);
2552 nfmsg->nfgen_family = exp->tuple.src.l3num;
2553 nfmsg->version = NFNETLINK_V0;
2554 nfmsg->res_id = 0;
2555
2556 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2557 goto nla_put_failure;
2558
2559 nlmsg_end(skb, nlh);
2560 return skb->len;
2561
2562 nlmsg_failure:
2563 nla_put_failure:
2564 nlmsg_cancel(skb, nlh);
2565 return -1;
2566 }
2567
2568 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2569 static int
2570 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2571 {
2572 struct nf_conntrack_expect *exp = item->exp;
2573 struct net *net = nf_ct_exp_net(exp);
2574 struct nlmsghdr *nlh;
2575 struct nfgenmsg *nfmsg;
2576 struct sk_buff *skb;
2577 unsigned int type, group;
2578 int flags = 0;
2579
2580 if (events & (1 << IPEXP_DESTROY)) {
2581 type = IPCTNL_MSG_EXP_DELETE;
2582 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2583 } else if (events & (1 << IPEXP_NEW)) {
2584 type = IPCTNL_MSG_EXP_NEW;
2585 flags = NLM_F_CREATE|NLM_F_EXCL;
2586 group = NFNLGRP_CONNTRACK_EXP_NEW;
2587 } else
2588 return 0;
2589
2590 if (!item->report && !nfnetlink_has_listeners(net, group))
2591 return 0;
2592
2593 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2594 if (skb == NULL)
2595 goto errout;
2596
2597 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2598 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2599 if (nlh == NULL)
2600 goto nlmsg_failure;
2601
2602 nfmsg = nlmsg_data(nlh);
2603 nfmsg->nfgen_family = exp->tuple.src.l3num;
2604 nfmsg->version = NFNETLINK_V0;
2605 nfmsg->res_id = 0;
2606
2607 rcu_read_lock();
2608 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2609 goto nla_put_failure;
2610 rcu_read_unlock();
2611
2612 nlmsg_end(skb, nlh);
2613 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2614 return 0;
2615
2616 nla_put_failure:
2617 rcu_read_unlock();
2618 nlmsg_cancel(skb, nlh);
2619 nlmsg_failure:
2620 kfree_skb(skb);
2621 errout:
2622 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2623 return 0;
2624 }
2625 #endif
2626 static int ctnetlink_exp_done(struct netlink_callback *cb)
2627 {
2628 if (cb->args[1])
2629 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2630 return 0;
2631 }
2632
2633 static int
2634 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2635 {
2636 struct net *net = sock_net(skb->sk);
2637 struct nf_conntrack_expect *exp, *last;
2638 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2639 u_int8_t l3proto = nfmsg->nfgen_family;
2640
2641 rcu_read_lock();
2642 last = (struct nf_conntrack_expect *)cb->args[1];
2643 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2644 restart:
2645 hlist_for_each_entry(exp, &nf_ct_expect_hash[cb->args[0]],
2646 hnode) {
2647 if (l3proto && exp->tuple.src.l3num != l3proto)
2648 continue;
2649
2650 if (!net_eq(nf_ct_net(exp->master), net))
2651 continue;
2652
2653 if (cb->args[1]) {
2654 if (exp != last)
2655 continue;
2656 cb->args[1] = 0;
2657 }
2658 if (ctnetlink_exp_fill_info(skb,
2659 NETLINK_CB(cb->skb).portid,
2660 cb->nlh->nlmsg_seq,
2661 IPCTNL_MSG_EXP_NEW,
2662 exp) < 0) {
2663 if (!atomic_inc_not_zero(&exp->use))
2664 continue;
2665 cb->args[1] = (unsigned long)exp;
2666 goto out;
2667 }
2668 }
2669 if (cb->args[1]) {
2670 cb->args[1] = 0;
2671 goto restart;
2672 }
2673 }
2674 out:
2675 rcu_read_unlock();
2676 if (last)
2677 nf_ct_expect_put(last);
2678
2679 return skb->len;
2680 }
2681
2682 static int
2683 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2684 {
2685 struct nf_conntrack_expect *exp, *last;
2686 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2687 struct nf_conn *ct = cb->data;
2688 struct nf_conn_help *help = nfct_help(ct);
2689 u_int8_t l3proto = nfmsg->nfgen_family;
2690
2691 if (cb->args[0])
2692 return 0;
2693
2694 rcu_read_lock();
2695 last = (struct nf_conntrack_expect *)cb->args[1];
2696 restart:
2697 hlist_for_each_entry(exp, &help->expectations, lnode) {
2698 if (l3proto && exp->tuple.src.l3num != l3proto)
2699 continue;
2700 if (cb->args[1]) {
2701 if (exp != last)
2702 continue;
2703 cb->args[1] = 0;
2704 }
2705 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2706 cb->nlh->nlmsg_seq,
2707 IPCTNL_MSG_EXP_NEW,
2708 exp) < 0) {
2709 if (!atomic_inc_not_zero(&exp->use))
2710 continue;
2711 cb->args[1] = (unsigned long)exp;
2712 goto out;
2713 }
2714 }
2715 if (cb->args[1]) {
2716 cb->args[1] = 0;
2717 goto restart;
2718 }
2719 cb->args[0] = 1;
2720 out:
2721 rcu_read_unlock();
2722 if (last)
2723 nf_ct_expect_put(last);
2724
2725 return skb->len;
2726 }
2727
2728 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
2729 struct sk_buff *skb,
2730 const struct nlmsghdr *nlh,
2731 const struct nlattr * const cda[])
2732 {
2733 int err;
2734 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2735 u_int8_t u3 = nfmsg->nfgen_family;
2736 struct nf_conntrack_tuple tuple;
2737 struct nf_conntrack_tuple_hash *h;
2738 struct nf_conn *ct;
2739 struct nf_conntrack_zone zone;
2740 struct netlink_dump_control c = {
2741 .dump = ctnetlink_exp_ct_dump_table,
2742 .done = ctnetlink_exp_done,
2743 };
2744
2745 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2746 u3, NULL);
2747 if (err < 0)
2748 return err;
2749
2750 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2751 if (err < 0)
2752 return err;
2753
2754 h = nf_conntrack_find_get(net, &zone, &tuple);
2755 if (!h)
2756 return -ENOENT;
2757
2758 ct = nf_ct_tuplehash_to_ctrack(h);
2759 c.data = ct;
2760
2761 err = netlink_dump_start(ctnl, skb, nlh, &c);
2762 nf_ct_put(ct);
2763
2764 return err;
2765 }
2766
2767 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
2768 struct sk_buff *skb, const struct nlmsghdr *nlh,
2769 const struct nlattr * const cda[])
2770 {
2771 struct nf_conntrack_tuple tuple;
2772 struct nf_conntrack_expect *exp;
2773 struct sk_buff *skb2;
2774 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2775 u_int8_t u3 = nfmsg->nfgen_family;
2776 struct nf_conntrack_zone zone;
2777 int err;
2778
2779 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2780 if (cda[CTA_EXPECT_MASTER])
2781 return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda);
2782 else {
2783 struct netlink_dump_control c = {
2784 .dump = ctnetlink_exp_dump_table,
2785 .done = ctnetlink_exp_done,
2786 };
2787 return netlink_dump_start(ctnl, skb, nlh, &c);
2788 }
2789 }
2790
2791 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2792 if (err < 0)
2793 return err;
2794
2795 if (cda[CTA_EXPECT_TUPLE])
2796 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2797 u3, NULL);
2798 else if (cda[CTA_EXPECT_MASTER])
2799 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2800 u3, NULL);
2801 else
2802 return -EINVAL;
2803
2804 if (err < 0)
2805 return err;
2806
2807 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2808 if (!exp)
2809 return -ENOENT;
2810
2811 if (cda[CTA_EXPECT_ID]) {
2812 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2813 if (ntohl(id) != (u32)(unsigned long)exp) {
2814 nf_ct_expect_put(exp);
2815 return -ENOENT;
2816 }
2817 }
2818
2819 err = -ENOMEM;
2820 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2821 if (skb2 == NULL) {
2822 nf_ct_expect_put(exp);
2823 goto out;
2824 }
2825
2826 rcu_read_lock();
2827 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2828 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2829 rcu_read_unlock();
2830 nf_ct_expect_put(exp);
2831 if (err <= 0)
2832 goto free;
2833
2834 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2835 if (err < 0)
2836 goto out;
2837
2838 return 0;
2839
2840 free:
2841 kfree_skb(skb2);
2842 out:
2843 /* this avoids a loop in nfnetlink. */
2844 return err == -EAGAIN ? -ENOBUFS : err;
2845 }
2846
2847 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
2848 struct sk_buff *skb, const struct nlmsghdr *nlh,
2849 const struct nlattr * const cda[])
2850 {
2851 struct nf_conntrack_expect *exp;
2852 struct nf_conntrack_tuple tuple;
2853 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2854 struct hlist_node *next;
2855 u_int8_t u3 = nfmsg->nfgen_family;
2856 struct nf_conntrack_zone zone;
2857 unsigned int i;
2858 int err;
2859
2860 if (cda[CTA_EXPECT_TUPLE]) {
2861 /* delete a single expect by tuple */
2862 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2863 if (err < 0)
2864 return err;
2865
2866 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2867 u3, NULL);
2868 if (err < 0)
2869 return err;
2870
2871 /* bump usage count to 2 */
2872 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2873 if (!exp)
2874 return -ENOENT;
2875
2876 if (cda[CTA_EXPECT_ID]) {
2877 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2878 if (ntohl(id) != (u32)(unsigned long)exp) {
2879 nf_ct_expect_put(exp);
2880 return -ENOENT;
2881 }
2882 }
2883
2884 /* after list removal, usage count == 1 */
2885 spin_lock_bh(&nf_conntrack_expect_lock);
2886 if (del_timer(&exp->timeout)) {
2887 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2888 nlmsg_report(nlh));
2889 nf_ct_expect_put(exp);
2890 }
2891 spin_unlock_bh(&nf_conntrack_expect_lock);
2892 /* have to put what we 'get' above.
2893 * after this line usage count == 0 */
2894 nf_ct_expect_put(exp);
2895 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2896 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2897 struct nf_conn_help *m_help;
2898
2899 /* delete all expectations for this helper */
2900 spin_lock_bh(&nf_conntrack_expect_lock);
2901 for (i = 0; i < nf_ct_expect_hsize; i++) {
2902 hlist_for_each_entry_safe(exp, next,
2903 &nf_ct_expect_hash[i],
2904 hnode) {
2905
2906 if (!net_eq(nf_ct_exp_net(exp), net))
2907 continue;
2908
2909 m_help = nfct_help(exp->master);
2910 if (!strcmp(m_help->helper->name, name) &&
2911 del_timer(&exp->timeout)) {
2912 nf_ct_unlink_expect_report(exp,
2913 NETLINK_CB(skb).portid,
2914 nlmsg_report(nlh));
2915 nf_ct_expect_put(exp);
2916 }
2917 }
2918 }
2919 spin_unlock_bh(&nf_conntrack_expect_lock);
2920 } else {
2921 /* This basically means we have to flush everything*/
2922 spin_lock_bh(&nf_conntrack_expect_lock);
2923 for (i = 0; i < nf_ct_expect_hsize; i++) {
2924 hlist_for_each_entry_safe(exp, next,
2925 &nf_ct_expect_hash[i],
2926 hnode) {
2927
2928 if (!net_eq(nf_ct_exp_net(exp), net))
2929 continue;
2930
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 ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3140 struct sk_buff *skb, const struct nlmsghdr *nlh,
3141 const struct nlattr * const cda[])
3142 {
3143 struct nf_conntrack_tuple tuple;
3144 struct nf_conntrack_expect *exp;
3145 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3146 u_int8_t u3 = nfmsg->nfgen_family;
3147 struct nf_conntrack_zone zone;
3148 int err;
3149
3150 if (!cda[CTA_EXPECT_TUPLE]
3151 || !cda[CTA_EXPECT_MASK]
3152 || !cda[CTA_EXPECT_MASTER])
3153 return -EINVAL;
3154
3155 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3156 if (err < 0)
3157 return err;
3158
3159 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3160 u3, NULL);
3161 if (err < 0)
3162 return err;
3163
3164 spin_lock_bh(&nf_conntrack_expect_lock);
3165 exp = __nf_ct_expect_find(net, &zone, &tuple);
3166 if (!exp) {
3167 spin_unlock_bh(&nf_conntrack_expect_lock);
3168 err = -ENOENT;
3169 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3170 err = ctnetlink_create_expect(net, &zone, cda, u3,
3171 NETLINK_CB(skb).portid,
3172 nlmsg_report(nlh));
3173 }
3174 return err;
3175 }
3176
3177 err = -EEXIST;
3178 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3179 err = ctnetlink_change_expect(exp, cda);
3180 spin_unlock_bh(&nf_conntrack_expect_lock);
3181
3182 return err;
3183 }
3184
3185 static int
3186 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3187 const struct ip_conntrack_stat *st)
3188 {
3189 struct nlmsghdr *nlh;
3190 struct nfgenmsg *nfmsg;
3191 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3192
3193 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
3194 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3195 if (nlh == NULL)
3196 goto nlmsg_failure;
3197
3198 nfmsg = nlmsg_data(nlh);
3199 nfmsg->nfgen_family = AF_UNSPEC;
3200 nfmsg->version = NFNETLINK_V0;
3201 nfmsg->res_id = htons(cpu);
3202
3203 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3204 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3205 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3206 goto nla_put_failure;
3207
3208 nlmsg_end(skb, nlh);
3209 return skb->len;
3210
3211 nla_put_failure:
3212 nlmsg_failure:
3213 nlmsg_cancel(skb, nlh);
3214 return -1;
3215 }
3216
3217 static int
3218 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3219 {
3220 int cpu;
3221 struct net *net = sock_net(skb->sk);
3222
3223 if (cb->args[0] == nr_cpu_ids)
3224 return 0;
3225
3226 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3227 const struct ip_conntrack_stat *st;
3228
3229 if (!cpu_possible(cpu))
3230 continue;
3231
3232 st = per_cpu_ptr(net->ct.stat, cpu);
3233 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3234 cb->nlh->nlmsg_seq,
3235 cpu, st) < 0)
3236 break;
3237 }
3238 cb->args[0] = cpu;
3239
3240 return skb->len;
3241 }
3242
3243 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3244 struct sk_buff *skb,
3245 const struct nlmsghdr *nlh,
3246 const struct nlattr * const cda[])
3247 {
3248 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3249 struct netlink_dump_control c = {
3250 .dump = ctnetlink_exp_stat_cpu_dump,
3251 };
3252 return netlink_dump_start(ctnl, skb, nlh, &c);
3253 }
3254
3255 return 0;
3256 }
3257
3258 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3259 static struct nf_ct_event_notifier ctnl_notifier = {
3260 .fcn = ctnetlink_conntrack_event,
3261 };
3262
3263 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3264 .fcn = ctnetlink_expect_event,
3265 };
3266 #endif
3267
3268 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3269 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3270 .attr_count = CTA_MAX,
3271 .policy = ct_nla_policy },
3272 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3273 .attr_count = CTA_MAX,
3274 .policy = ct_nla_policy },
3275 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3276 .attr_count = CTA_MAX,
3277 .policy = ct_nla_policy },
3278 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3279 .attr_count = CTA_MAX,
3280 .policy = ct_nla_policy },
3281 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3282 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3283 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3284 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3285 };
3286
3287 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3288 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3289 .attr_count = CTA_EXPECT_MAX,
3290 .policy = exp_nla_policy },
3291 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3292 .attr_count = CTA_EXPECT_MAX,
3293 .policy = exp_nla_policy },
3294 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3295 .attr_count = CTA_EXPECT_MAX,
3296 .policy = exp_nla_policy },
3297 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3298 };
3299
3300 static const struct nfnetlink_subsystem ctnl_subsys = {
3301 .name = "conntrack",
3302 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3303 .cb_count = IPCTNL_MSG_MAX,
3304 .cb = ctnl_cb,
3305 };
3306
3307 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3308 .name = "conntrack_expect",
3309 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3310 .cb_count = IPCTNL_MSG_EXP_MAX,
3311 .cb = ctnl_exp_cb,
3312 };
3313
3314 MODULE_ALIAS("ip_conntrack_netlink");
3315 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3316 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3317
3318 static int __net_init ctnetlink_net_init(struct net *net)
3319 {
3320 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3321 int ret;
3322
3323 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3324 if (ret < 0) {
3325 pr_err("ctnetlink_init: cannot register notifier.\n");
3326 goto err_out;
3327 }
3328
3329 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3330 if (ret < 0) {
3331 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3332 goto err_unreg_notifier;
3333 }
3334 #endif
3335 return 0;
3336
3337 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3338 err_unreg_notifier:
3339 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3340 err_out:
3341 return ret;
3342 #endif
3343 }
3344
3345 static void ctnetlink_net_exit(struct net *net)
3346 {
3347 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3348 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3349 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3350 #endif
3351 }
3352
3353 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3354 {
3355 struct net *net;
3356
3357 list_for_each_entry(net, net_exit_list, exit_list)
3358 ctnetlink_net_exit(net);
3359 }
3360
3361 static struct pernet_operations ctnetlink_net_ops = {
3362 .init = ctnetlink_net_init,
3363 .exit_batch = ctnetlink_net_exit_batch,
3364 };
3365
3366 static int __init ctnetlink_init(void)
3367 {
3368 int ret;
3369
3370 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3371 ret = nfnetlink_subsys_register(&ctnl_subsys);
3372 if (ret < 0) {
3373 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3374 goto err_out;
3375 }
3376
3377 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3378 if (ret < 0) {
3379 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3380 goto err_unreg_subsys;
3381 }
3382
3383 ret = register_pernet_subsys(&ctnetlink_net_ops);
3384 if (ret < 0) {
3385 pr_err("ctnetlink_init: cannot register pernet operations\n");
3386 goto err_unreg_exp_subsys;
3387 }
3388 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3389 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3390 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3391 #endif
3392 return 0;
3393
3394 err_unreg_exp_subsys:
3395 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3396 err_unreg_subsys:
3397 nfnetlink_subsys_unregister(&ctnl_subsys);
3398 err_out:
3399 return ret;
3400 }
3401
3402 static void __exit ctnetlink_exit(void)
3403 {
3404 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3405
3406 unregister_pernet_subsys(&ctnetlink_net_ops);
3407 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3408 nfnetlink_subsys_unregister(&ctnl_subsys);
3409 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3410 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3411 #endif
3412 }
3413
3414 module_init(ctnetlink_init);
3415 module_exit(ctnetlink_exit);
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