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netfilter: ctnetlink: Expectations must have a conntrack helper area
[mirror_ubuntu-artful-kernel.git] / net / netfilter / nf_conntrack_netlink.c
1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
8 *
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
11 *
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
13 *
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/security.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
32
33 #include <linux/netfilter.h>
34 #include <net/netlink.h>
35 #include <net/sock.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_core.h>
38 #include <net/netfilter/nf_conntrack_expect.h>
39 #include <net/netfilter/nf_conntrack_helper.h>
40 #include <net/netfilter/nf_conntrack_seqadj.h>
41 #include <net/netfilter/nf_conntrack_l3proto.h>
42 #include <net/netfilter/nf_conntrack_l4proto.h>
43 #include <net/netfilter/nf_conntrack_tuple.h>
44 #include <net/netfilter/nf_conntrack_acct.h>
45 #include <net/netfilter/nf_conntrack_zones.h>
46 #include <net/netfilter/nf_conntrack_timestamp.h>
47 #include <net/netfilter/nf_conntrack_labels.h>
48 #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 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1482 if (err < 0)
1483 return err;
1484
1485 /* don't change helper of sibling connections */
1486 if (ct->master) {
1487 /* If we try to change the helper to the same thing twice,
1488 * treat the second attempt as a no-op instead of returning
1489 * an error.
1490 */
1491 if (help && help->helper &&
1492 !strcmp(help->helper->name, helpname))
1493 return 0;
1494 else
1495 return -EBUSY;
1496 }
1497
1498 if (!strcmp(helpname, "")) {
1499 if (help && help->helper) {
1500 /* we had a helper before ... */
1501 nf_ct_remove_expectations(ct);
1502 RCU_INIT_POINTER(help->helper, NULL);
1503 }
1504
1505 return 0;
1506 }
1507
1508 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1509 nf_ct_protonum(ct));
1510 if (helper == NULL) {
1511 #ifdef CONFIG_MODULES
1512 spin_unlock_bh(&nf_conntrack_expect_lock);
1513
1514 if (request_module("nfct-helper-%s", helpname) < 0) {
1515 spin_lock_bh(&nf_conntrack_expect_lock);
1516 return -EOPNOTSUPP;
1517 }
1518
1519 spin_lock_bh(&nf_conntrack_expect_lock);
1520 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1521 nf_ct_protonum(ct));
1522 if (helper)
1523 return -EAGAIN;
1524 #endif
1525 return -EOPNOTSUPP;
1526 }
1527
1528 if (help) {
1529 if (help->helper == helper) {
1530 /* update private helper data if allowed. */
1531 if (helper->from_nlattr)
1532 helper->from_nlattr(helpinfo, ct);
1533 return 0;
1534 } else
1535 return -EBUSY;
1536 }
1537
1538 /* we cannot set a helper for an existing conntrack */
1539 return -EOPNOTSUPP;
1540 }
1541
1542 static int ctnetlink_change_timeout(struct nf_conn *ct,
1543 const struct nlattr * const cda[])
1544 {
1545 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1546
1547 ct->timeout = nfct_time_stamp + timeout * HZ;
1548
1549 if (test_bit(IPS_DYING_BIT, &ct->status))
1550 return -ETIME;
1551
1552 return 0;
1553 }
1554
1555 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1556 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1557 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1558 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1559 };
1560
1561 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
1562 const struct nlattr * const cda[])
1563 {
1564 const struct nlattr *attr = cda[CTA_PROTOINFO];
1565 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1566 struct nf_conntrack_l4proto *l4proto;
1567 int err = 0;
1568
1569 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1570 if (err < 0)
1571 return err;
1572
1573 rcu_read_lock();
1574 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1575 if (l4proto->from_nlattr)
1576 err = l4proto->from_nlattr(tb, ct);
1577 rcu_read_unlock();
1578
1579 return err;
1580 }
1581
1582 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1583 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1584 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1585 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1586 };
1587
1588 static int change_seq_adj(struct nf_ct_seqadj *seq,
1589 const struct nlattr * const attr)
1590 {
1591 int err;
1592 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1593
1594 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1595 if (err < 0)
1596 return err;
1597
1598 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1599 return -EINVAL;
1600
1601 seq->correction_pos =
1602 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1603
1604 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1605 return -EINVAL;
1606
1607 seq->offset_before =
1608 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1609
1610 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1611 return -EINVAL;
1612
1613 seq->offset_after =
1614 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1615
1616 return 0;
1617 }
1618
1619 static int
1620 ctnetlink_change_seq_adj(struct nf_conn *ct,
1621 const struct nlattr * const cda[])
1622 {
1623 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1624 int ret = 0;
1625
1626 if (!seqadj)
1627 return 0;
1628
1629 if (cda[CTA_SEQ_ADJ_ORIG]) {
1630 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1631 cda[CTA_SEQ_ADJ_ORIG]);
1632 if (ret < 0)
1633 return ret;
1634
1635 ct->status |= IPS_SEQ_ADJUST;
1636 }
1637
1638 if (cda[CTA_SEQ_ADJ_REPLY]) {
1639 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1640 cda[CTA_SEQ_ADJ_REPLY]);
1641 if (ret < 0)
1642 return ret;
1643
1644 ct->status |= IPS_SEQ_ADJUST;
1645 }
1646
1647 return 0;
1648 }
1649
1650 static int
1651 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1652 {
1653 #ifdef CONFIG_NF_CONNTRACK_LABELS
1654 size_t len = nla_len(cda[CTA_LABELS]);
1655 const void *mask = cda[CTA_LABELS_MASK];
1656
1657 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1658 return -EINVAL;
1659
1660 if (mask) {
1661 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1662 nla_len(cda[CTA_LABELS_MASK]) != len)
1663 return -EINVAL;
1664 mask = nla_data(cda[CTA_LABELS_MASK]);
1665 }
1666
1667 len /= sizeof(u32);
1668
1669 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1670 #else
1671 return -EOPNOTSUPP;
1672 #endif
1673 }
1674
1675 static int
1676 ctnetlink_change_conntrack(struct nf_conn *ct,
1677 const struct nlattr * const cda[])
1678 {
1679 int err;
1680
1681 /* only allow NAT changes and master assignation for new conntracks */
1682 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1683 return -EOPNOTSUPP;
1684
1685 if (cda[CTA_HELP]) {
1686 err = ctnetlink_change_helper(ct, cda);
1687 if (err < 0)
1688 return err;
1689 }
1690
1691 if (cda[CTA_TIMEOUT]) {
1692 err = ctnetlink_change_timeout(ct, cda);
1693 if (err < 0)
1694 return err;
1695 }
1696
1697 if (cda[CTA_STATUS]) {
1698 err = ctnetlink_change_status(ct, cda);
1699 if (err < 0)
1700 return err;
1701 }
1702
1703 if (cda[CTA_PROTOINFO]) {
1704 err = ctnetlink_change_protoinfo(ct, cda);
1705 if (err < 0)
1706 return err;
1707 }
1708
1709 #if defined(CONFIG_NF_CONNTRACK_MARK)
1710 if (cda[CTA_MARK])
1711 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1712 #endif
1713
1714 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1715 err = ctnetlink_change_seq_adj(ct, cda);
1716 if (err < 0)
1717 return err;
1718 }
1719
1720 if (cda[CTA_LABELS]) {
1721 err = ctnetlink_attach_labels(ct, cda);
1722 if (err < 0)
1723 return err;
1724 }
1725
1726 return 0;
1727 }
1728
1729 static struct nf_conn *
1730 ctnetlink_create_conntrack(struct net *net,
1731 const struct nf_conntrack_zone *zone,
1732 const struct nlattr * const cda[],
1733 struct nf_conntrack_tuple *otuple,
1734 struct nf_conntrack_tuple *rtuple,
1735 u8 u3)
1736 {
1737 struct nf_conn *ct;
1738 int err = -EINVAL;
1739 struct nf_conntrack_helper *helper;
1740 struct nf_conn_tstamp *tstamp;
1741
1742 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1743 if (IS_ERR(ct))
1744 return ERR_PTR(-ENOMEM);
1745
1746 if (!cda[CTA_TIMEOUT])
1747 goto err1;
1748
1749 ct->timeout = nfct_time_stamp + ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1750
1751 rcu_read_lock();
1752 if (cda[CTA_HELP]) {
1753 char *helpname = NULL;
1754 struct nlattr *helpinfo = NULL;
1755
1756 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1757 if (err < 0)
1758 goto err2;
1759
1760 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1761 nf_ct_protonum(ct));
1762 if (helper == NULL) {
1763 rcu_read_unlock();
1764 #ifdef CONFIG_MODULES
1765 if (request_module("nfct-helper-%s", helpname) < 0) {
1766 err = -EOPNOTSUPP;
1767 goto err1;
1768 }
1769
1770 rcu_read_lock();
1771 helper = __nf_conntrack_helper_find(helpname,
1772 nf_ct_l3num(ct),
1773 nf_ct_protonum(ct));
1774 if (helper) {
1775 err = -EAGAIN;
1776 goto err2;
1777 }
1778 rcu_read_unlock();
1779 #endif
1780 err = -EOPNOTSUPP;
1781 goto err1;
1782 } else {
1783 struct nf_conn_help *help;
1784
1785 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1786 if (help == NULL) {
1787 err = -ENOMEM;
1788 goto err2;
1789 }
1790 /* set private helper data if allowed. */
1791 if (helper->from_nlattr)
1792 helper->from_nlattr(helpinfo, ct);
1793
1794 /* not in hash table yet so not strictly necessary */
1795 RCU_INIT_POINTER(help->helper, helper);
1796 }
1797 } else {
1798 /* try an implicit helper assignation */
1799 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1800 if (err < 0)
1801 goto err2;
1802 }
1803
1804 err = ctnetlink_setup_nat(ct, cda);
1805 if (err < 0)
1806 goto err2;
1807
1808 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1809 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1810 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1811 nf_ct_labels_ext_add(ct);
1812
1813 /* we must add conntrack extensions before confirmation. */
1814 ct->status |= IPS_CONFIRMED;
1815
1816 if (cda[CTA_STATUS]) {
1817 err = ctnetlink_change_status(ct, cda);
1818 if (err < 0)
1819 goto err2;
1820 }
1821
1822 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1823 err = ctnetlink_change_seq_adj(ct, cda);
1824 if (err < 0)
1825 goto err2;
1826 }
1827
1828 memset(&ct->proto, 0, sizeof(ct->proto));
1829 if (cda[CTA_PROTOINFO]) {
1830 err = ctnetlink_change_protoinfo(ct, cda);
1831 if (err < 0)
1832 goto err2;
1833 }
1834
1835 #if defined(CONFIG_NF_CONNTRACK_MARK)
1836 if (cda[CTA_MARK])
1837 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1838 #endif
1839
1840 /* setup master conntrack: this is a confirmed expectation */
1841 if (cda[CTA_TUPLE_MASTER]) {
1842 struct nf_conntrack_tuple master;
1843 struct nf_conntrack_tuple_hash *master_h;
1844 struct nf_conn *master_ct;
1845
1846 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
1847 u3, NULL);
1848 if (err < 0)
1849 goto err2;
1850
1851 master_h = nf_conntrack_find_get(net, zone, &master);
1852 if (master_h == NULL) {
1853 err = -ENOENT;
1854 goto err2;
1855 }
1856 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1857 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1858 ct->master = master_ct;
1859 }
1860 tstamp = nf_conn_tstamp_find(ct);
1861 if (tstamp)
1862 tstamp->start = ktime_get_real_ns();
1863
1864 err = nf_conntrack_hash_check_insert(ct);
1865 if (err < 0)
1866 goto err2;
1867
1868 rcu_read_unlock();
1869
1870 return ct;
1871
1872 err2:
1873 rcu_read_unlock();
1874 err1:
1875 nf_conntrack_free(ct);
1876 return ERR_PTR(err);
1877 }
1878
1879 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
1880 struct sk_buff *skb,
1881 const struct nlmsghdr *nlh,
1882 const struct nlattr * const cda[])
1883 {
1884 struct nf_conntrack_tuple otuple, rtuple;
1885 struct nf_conntrack_tuple_hash *h = NULL;
1886 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1887 struct nf_conn *ct;
1888 u_int8_t u3 = nfmsg->nfgen_family;
1889 struct nf_conntrack_zone zone;
1890 int err;
1891
1892 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1893 if (err < 0)
1894 return err;
1895
1896 if (cda[CTA_TUPLE_ORIG]) {
1897 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
1898 u3, &zone);
1899 if (err < 0)
1900 return err;
1901 }
1902
1903 if (cda[CTA_TUPLE_REPLY]) {
1904 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
1905 u3, &zone);
1906 if (err < 0)
1907 return err;
1908 }
1909
1910 if (cda[CTA_TUPLE_ORIG])
1911 h = nf_conntrack_find_get(net, &zone, &otuple);
1912 else if (cda[CTA_TUPLE_REPLY])
1913 h = nf_conntrack_find_get(net, &zone, &rtuple);
1914
1915 if (h == NULL) {
1916 err = -ENOENT;
1917 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1918 enum ip_conntrack_events events;
1919
1920 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1921 return -EINVAL;
1922 if (otuple.dst.protonum != rtuple.dst.protonum)
1923 return -EINVAL;
1924
1925 ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
1926 &rtuple, u3);
1927 if (IS_ERR(ct))
1928 return PTR_ERR(ct);
1929
1930 err = 0;
1931 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1932 events = IPCT_RELATED;
1933 else
1934 events = IPCT_NEW;
1935
1936 if (cda[CTA_LABELS] &&
1937 ctnetlink_attach_labels(ct, cda) == 0)
1938 events |= (1 << IPCT_LABEL);
1939
1940 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1941 (1 << IPCT_ASSURED) |
1942 (1 << IPCT_HELPER) |
1943 (1 << IPCT_PROTOINFO) |
1944 (1 << IPCT_SEQADJ) |
1945 (1 << IPCT_MARK) | events,
1946 ct, NETLINK_CB(skb).portid,
1947 nlmsg_report(nlh));
1948 nf_ct_put(ct);
1949 }
1950
1951 return err;
1952 }
1953 /* implicit 'else' */
1954
1955 err = -EEXIST;
1956 ct = nf_ct_tuplehash_to_ctrack(h);
1957 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1958 spin_lock_bh(&nf_conntrack_expect_lock);
1959 err = ctnetlink_change_conntrack(ct, cda);
1960 spin_unlock_bh(&nf_conntrack_expect_lock);
1961 if (err == 0) {
1962 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1963 (1 << IPCT_ASSURED) |
1964 (1 << IPCT_HELPER) |
1965 (1 << IPCT_LABEL) |
1966 (1 << IPCT_PROTOINFO) |
1967 (1 << IPCT_SEQADJ) |
1968 (1 << IPCT_MARK),
1969 ct, NETLINK_CB(skb).portid,
1970 nlmsg_report(nlh));
1971 }
1972 }
1973
1974 nf_ct_put(ct);
1975 return err;
1976 }
1977
1978 static int
1979 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1980 __u16 cpu, const struct ip_conntrack_stat *st)
1981 {
1982 struct nlmsghdr *nlh;
1983 struct nfgenmsg *nfmsg;
1984 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1985
1986 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1987 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1988 if (nlh == NULL)
1989 goto nlmsg_failure;
1990
1991 nfmsg = nlmsg_data(nlh);
1992 nfmsg->nfgen_family = AF_UNSPEC;
1993 nfmsg->version = NFNETLINK_V0;
1994 nfmsg->res_id = htons(cpu);
1995
1996 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1997 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1998 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1999 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2000 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2001 htonl(st->insert_failed)) ||
2002 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2003 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2004 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2005 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2006 htonl(st->search_restart)))
2007 goto nla_put_failure;
2008
2009 nlmsg_end(skb, nlh);
2010 return skb->len;
2011
2012 nla_put_failure:
2013 nlmsg_failure:
2014 nlmsg_cancel(skb, nlh);
2015 return -1;
2016 }
2017
2018 static int
2019 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2020 {
2021 int cpu;
2022 struct net *net = sock_net(skb->sk);
2023
2024 if (cb->args[0] == nr_cpu_ids)
2025 return 0;
2026
2027 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2028 const struct ip_conntrack_stat *st;
2029
2030 if (!cpu_possible(cpu))
2031 continue;
2032
2033 st = per_cpu_ptr(net->ct.stat, cpu);
2034 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2035 NETLINK_CB(cb->skb).portid,
2036 cb->nlh->nlmsg_seq,
2037 cpu, st) < 0)
2038 break;
2039 }
2040 cb->args[0] = cpu;
2041
2042 return skb->len;
2043 }
2044
2045 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2046 struct sk_buff *skb,
2047 const struct nlmsghdr *nlh,
2048 const struct nlattr * const cda[])
2049 {
2050 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2051 struct netlink_dump_control c = {
2052 .dump = ctnetlink_ct_stat_cpu_dump,
2053 };
2054 return netlink_dump_start(ctnl, skb, nlh, &c);
2055 }
2056
2057 return 0;
2058 }
2059
2060 static int
2061 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2062 struct net *net)
2063 {
2064 struct nlmsghdr *nlh;
2065 struct nfgenmsg *nfmsg;
2066 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2067 unsigned int nr_conntracks = atomic_read(&net->ct.count);
2068
2069 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
2070 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2071 if (nlh == NULL)
2072 goto nlmsg_failure;
2073
2074 nfmsg = nlmsg_data(nlh);
2075 nfmsg->nfgen_family = AF_UNSPEC;
2076 nfmsg->version = NFNETLINK_V0;
2077 nfmsg->res_id = 0;
2078
2079 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2080 goto nla_put_failure;
2081
2082 nlmsg_end(skb, nlh);
2083 return skb->len;
2084
2085 nla_put_failure:
2086 nlmsg_failure:
2087 nlmsg_cancel(skb, nlh);
2088 return -1;
2089 }
2090
2091 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2092 struct sk_buff *skb, const struct nlmsghdr *nlh,
2093 const struct nlattr * const cda[])
2094 {
2095 struct sk_buff *skb2;
2096 int err;
2097
2098 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2099 if (skb2 == NULL)
2100 return -ENOMEM;
2101
2102 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2103 nlh->nlmsg_seq,
2104 NFNL_MSG_TYPE(nlh->nlmsg_type),
2105 sock_net(skb->sk));
2106 if (err <= 0)
2107 goto free;
2108
2109 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2110 if (err < 0)
2111 goto out;
2112
2113 return 0;
2114
2115 free:
2116 kfree_skb(skb2);
2117 out:
2118 /* this avoids a loop in nfnetlink. */
2119 return err == -EAGAIN ? -ENOBUFS : err;
2120 }
2121
2122 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2123 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2124 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2125 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2126 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2127 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2128 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2129 .len = NF_CT_HELPER_NAME_LEN - 1 },
2130 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2131 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2132 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2133 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2134 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2135 };
2136
2137 static struct nf_conntrack_expect *
2138 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2139 struct nf_conntrack_helper *helper,
2140 struct nf_conntrack_tuple *tuple,
2141 struct nf_conntrack_tuple *mask);
2142
2143 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2144 static size_t
2145 ctnetlink_glue_build_size(const struct nf_conn *ct)
2146 {
2147 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2148 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2149 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2150 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2151 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2152 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2153 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2154 + nla_total_size(0) /* CTA_PROTOINFO */
2155 + nla_total_size(0) /* CTA_HELP */
2156 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2157 + ctnetlink_secctx_size(ct)
2158 #ifdef CONFIG_NF_NAT_NEEDED
2159 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2160 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2161 #endif
2162 #ifdef CONFIG_NF_CONNTRACK_MARK
2163 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2164 #endif
2165 #ifdef CONFIG_NF_CONNTRACK_ZONES
2166 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2167 #endif
2168 + ctnetlink_proto_size(ct)
2169 ;
2170 }
2171
2172 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2173 enum ip_conntrack_info *ctinfo)
2174 {
2175 struct nf_conn *ct;
2176
2177 ct = nf_ct_get(skb, ctinfo);
2178 if (ct && nf_ct_is_untracked(ct))
2179 ct = NULL;
2180
2181 return ct;
2182 }
2183
2184 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2185 {
2186 const struct nf_conntrack_zone *zone;
2187 struct nlattr *nest_parms;
2188
2189 rcu_read_lock();
2190 zone = nf_ct_zone(ct);
2191
2192 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2193 if (!nest_parms)
2194 goto nla_put_failure;
2195 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2196 goto nla_put_failure;
2197 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2198 NF_CT_ZONE_DIR_ORIG) < 0)
2199 goto nla_put_failure;
2200 nla_nest_end(skb, nest_parms);
2201
2202 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2203 if (!nest_parms)
2204 goto nla_put_failure;
2205 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2206 goto nla_put_failure;
2207 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2208 NF_CT_ZONE_DIR_REPL) < 0)
2209 goto nla_put_failure;
2210 nla_nest_end(skb, nest_parms);
2211
2212 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2213 NF_CT_DEFAULT_ZONE_DIR) < 0)
2214 goto nla_put_failure;
2215
2216 if (ctnetlink_dump_id(skb, ct) < 0)
2217 goto nla_put_failure;
2218
2219 if (ctnetlink_dump_status(skb, ct) < 0)
2220 goto nla_put_failure;
2221
2222 if (ctnetlink_dump_timeout(skb, ct) < 0)
2223 goto nla_put_failure;
2224
2225 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2226 goto nla_put_failure;
2227
2228 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2229 goto nla_put_failure;
2230
2231 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2232 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2233 goto nla_put_failure;
2234 #endif
2235 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2236 goto nla_put_failure;
2237
2238 if ((ct->status & IPS_SEQ_ADJUST) &&
2239 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2240 goto nla_put_failure;
2241
2242 #ifdef CONFIG_NF_CONNTRACK_MARK
2243 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2244 goto nla_put_failure;
2245 #endif
2246 if (ctnetlink_dump_labels(skb, ct) < 0)
2247 goto nla_put_failure;
2248 rcu_read_unlock();
2249 return 0;
2250
2251 nla_put_failure:
2252 rcu_read_unlock();
2253 return -ENOSPC;
2254 }
2255
2256 static int
2257 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2258 enum ip_conntrack_info ctinfo,
2259 u_int16_t ct_attr, u_int16_t ct_info_attr)
2260 {
2261 struct nlattr *nest_parms;
2262
2263 nest_parms = nla_nest_start(skb, ct_attr | NLA_F_NESTED);
2264 if (!nest_parms)
2265 goto nla_put_failure;
2266
2267 if (__ctnetlink_glue_build(skb, ct) < 0)
2268 goto nla_put_failure;
2269
2270 nla_nest_end(skb, nest_parms);
2271
2272 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2273 goto nla_put_failure;
2274
2275 return 0;
2276
2277 nla_put_failure:
2278 return -ENOSPC;
2279 }
2280
2281 static int
2282 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2283 {
2284 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2285 unsigned long d = ct->status ^ status;
2286
2287 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2288 /* SEEN_REPLY bit can only be set */
2289 return -EBUSY;
2290
2291 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2292 /* ASSURED bit can only be set */
2293 return -EBUSY;
2294
2295 /* This check is less strict than ctnetlink_change_status()
2296 * because callers often flip IPS_EXPECTED bits when sending
2297 * an NFQA_CT attribute to the kernel. So ignore the
2298 * unchangeable bits but do not error out.
2299 */
2300 ct->status = (status & ~IPS_UNCHANGEABLE_MASK) |
2301 (ct->status & IPS_UNCHANGEABLE_MASK);
2302 return 0;
2303 }
2304
2305 static int
2306 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2307 {
2308 int err;
2309
2310 if (cda[CTA_TIMEOUT]) {
2311 err = ctnetlink_change_timeout(ct, cda);
2312 if (err < 0)
2313 return err;
2314 }
2315 if (cda[CTA_STATUS]) {
2316 err = ctnetlink_update_status(ct, cda);
2317 if (err < 0)
2318 return err;
2319 }
2320 if (cda[CTA_HELP]) {
2321 err = ctnetlink_change_helper(ct, cda);
2322 if (err < 0)
2323 return err;
2324 }
2325 if (cda[CTA_LABELS]) {
2326 err = ctnetlink_attach_labels(ct, cda);
2327 if (err < 0)
2328 return err;
2329 }
2330 #if defined(CONFIG_NF_CONNTRACK_MARK)
2331 if (cda[CTA_MARK]) {
2332 u32 mask = 0, mark, newmark;
2333 if (cda[CTA_MARK_MASK])
2334 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2335
2336 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2337 newmark = (ct->mark & mask) ^ mark;
2338 if (newmark != ct->mark)
2339 ct->mark = newmark;
2340 }
2341 #endif
2342 return 0;
2343 }
2344
2345 static int
2346 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2347 {
2348 struct nlattr *cda[CTA_MAX+1];
2349 int ret;
2350
2351 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2352 if (ret < 0)
2353 return ret;
2354
2355 spin_lock_bh(&nf_conntrack_expect_lock);
2356 ret = ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2357 spin_unlock_bh(&nf_conntrack_expect_lock);
2358
2359 return ret;
2360 }
2361
2362 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2363 const struct nf_conn *ct,
2364 struct nf_conntrack_tuple *tuple,
2365 struct nf_conntrack_tuple *mask)
2366 {
2367 int err;
2368
2369 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2370 nf_ct_l3num(ct), NULL);
2371 if (err < 0)
2372 return err;
2373
2374 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2375 nf_ct_l3num(ct), NULL);
2376 }
2377
2378 static int
2379 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2380 u32 portid, u32 report)
2381 {
2382 struct nlattr *cda[CTA_EXPECT_MAX+1];
2383 struct nf_conntrack_tuple tuple, mask;
2384 struct nf_conntrack_helper *helper = NULL;
2385 struct nf_conntrack_expect *exp;
2386 int err;
2387
2388 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2389 if (err < 0)
2390 return err;
2391
2392 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2393 ct, &tuple, &mask);
2394 if (err < 0)
2395 return err;
2396
2397 if (cda[CTA_EXPECT_HELP_NAME]) {
2398 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2399
2400 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2401 nf_ct_protonum(ct));
2402 if (helper == NULL)
2403 return -EOPNOTSUPP;
2404 }
2405
2406 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2407 helper, &tuple, &mask);
2408 if (IS_ERR(exp))
2409 return PTR_ERR(exp);
2410
2411 err = nf_ct_expect_related_report(exp, portid, report);
2412 nf_ct_expect_put(exp);
2413 return err;
2414 }
2415
2416 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2417 enum ip_conntrack_info ctinfo, int diff)
2418 {
2419 if (!(ct->status & IPS_NAT_MASK))
2420 return;
2421
2422 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2423 }
2424
2425 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2426 .get_ct = ctnetlink_glue_get_ct,
2427 .build_size = ctnetlink_glue_build_size,
2428 .build = ctnetlink_glue_build,
2429 .parse = ctnetlink_glue_parse,
2430 .attach_expect = ctnetlink_glue_attach_expect,
2431 .seq_adjust = ctnetlink_glue_seqadj,
2432 };
2433 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2434
2435 /***********************************************************************
2436 * EXPECT
2437 ***********************************************************************/
2438
2439 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2440 const struct nf_conntrack_tuple *tuple,
2441 enum ctattr_expect type)
2442 {
2443 struct nlattr *nest_parms;
2444
2445 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2446 if (!nest_parms)
2447 goto nla_put_failure;
2448 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2449 goto nla_put_failure;
2450 nla_nest_end(skb, nest_parms);
2451
2452 return 0;
2453
2454 nla_put_failure:
2455 return -1;
2456 }
2457
2458 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2459 const struct nf_conntrack_tuple *tuple,
2460 const struct nf_conntrack_tuple_mask *mask)
2461 {
2462 int ret;
2463 struct nf_conntrack_l3proto *l3proto;
2464 struct nf_conntrack_l4proto *l4proto;
2465 struct nf_conntrack_tuple m;
2466 struct nlattr *nest_parms;
2467
2468 memset(&m, 0xFF, sizeof(m));
2469 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2470 m.src.u.all = mask->src.u.all;
2471 m.dst.protonum = tuple->dst.protonum;
2472
2473 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2474 if (!nest_parms)
2475 goto nla_put_failure;
2476
2477 rcu_read_lock();
2478 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2479 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2480 if (ret >= 0) {
2481 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2482 tuple->dst.protonum);
2483 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2484 }
2485 rcu_read_unlock();
2486
2487 if (unlikely(ret < 0))
2488 goto nla_put_failure;
2489
2490 nla_nest_end(skb, nest_parms);
2491
2492 return 0;
2493
2494 nla_put_failure:
2495 return -1;
2496 }
2497
2498 static const union nf_inet_addr any_addr;
2499
2500 static int
2501 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2502 const struct nf_conntrack_expect *exp)
2503 {
2504 struct nf_conn *master = exp->master;
2505 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2506 struct nf_conn_help *help;
2507 #ifdef CONFIG_NF_NAT_NEEDED
2508 struct nlattr *nest_parms;
2509 struct nf_conntrack_tuple nat_tuple = {};
2510 #endif
2511 struct nf_ct_helper_expectfn *expfn;
2512
2513 if (timeout < 0)
2514 timeout = 0;
2515
2516 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2517 goto nla_put_failure;
2518 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2519 goto nla_put_failure;
2520 if (ctnetlink_exp_dump_tuple(skb,
2521 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2522 CTA_EXPECT_MASTER) < 0)
2523 goto nla_put_failure;
2524
2525 #ifdef CONFIG_NF_NAT_NEEDED
2526 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2527 exp->saved_proto.all) {
2528 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2529 if (!nest_parms)
2530 goto nla_put_failure;
2531
2532 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2533 goto nla_put_failure;
2534
2535 nat_tuple.src.l3num = nf_ct_l3num(master);
2536 nat_tuple.src.u3 = exp->saved_addr;
2537 nat_tuple.dst.protonum = nf_ct_protonum(master);
2538 nat_tuple.src.u = exp->saved_proto;
2539
2540 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2541 CTA_EXPECT_NAT_TUPLE) < 0)
2542 goto nla_put_failure;
2543 nla_nest_end(skb, nest_parms);
2544 }
2545 #endif
2546 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2547 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2548 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2549 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2550 goto nla_put_failure;
2551 help = nfct_help(master);
2552 if (help) {
2553 struct nf_conntrack_helper *helper;
2554
2555 helper = rcu_dereference(help->helper);
2556 if (helper &&
2557 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2558 goto nla_put_failure;
2559 }
2560 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2561 if (expfn != NULL &&
2562 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2563 goto nla_put_failure;
2564
2565 return 0;
2566
2567 nla_put_failure:
2568 return -1;
2569 }
2570
2571 static int
2572 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2573 int event, const struct nf_conntrack_expect *exp)
2574 {
2575 struct nlmsghdr *nlh;
2576 struct nfgenmsg *nfmsg;
2577 unsigned int flags = portid ? NLM_F_MULTI : 0;
2578
2579 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2580 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2581 if (nlh == NULL)
2582 goto nlmsg_failure;
2583
2584 nfmsg = nlmsg_data(nlh);
2585 nfmsg->nfgen_family = exp->tuple.src.l3num;
2586 nfmsg->version = NFNETLINK_V0;
2587 nfmsg->res_id = 0;
2588
2589 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2590 goto nla_put_failure;
2591
2592 nlmsg_end(skb, nlh);
2593 return skb->len;
2594
2595 nlmsg_failure:
2596 nla_put_failure:
2597 nlmsg_cancel(skb, nlh);
2598 return -1;
2599 }
2600
2601 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2602 static int
2603 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2604 {
2605 struct nf_conntrack_expect *exp = item->exp;
2606 struct net *net = nf_ct_exp_net(exp);
2607 struct nlmsghdr *nlh;
2608 struct nfgenmsg *nfmsg;
2609 struct sk_buff *skb;
2610 unsigned int type, group;
2611 int flags = 0;
2612
2613 if (events & (1 << IPEXP_DESTROY)) {
2614 type = IPCTNL_MSG_EXP_DELETE;
2615 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2616 } else if (events & (1 << IPEXP_NEW)) {
2617 type = IPCTNL_MSG_EXP_NEW;
2618 flags = NLM_F_CREATE|NLM_F_EXCL;
2619 group = NFNLGRP_CONNTRACK_EXP_NEW;
2620 } else
2621 return 0;
2622
2623 if (!item->report && !nfnetlink_has_listeners(net, group))
2624 return 0;
2625
2626 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2627 if (skb == NULL)
2628 goto errout;
2629
2630 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2631 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2632 if (nlh == NULL)
2633 goto nlmsg_failure;
2634
2635 nfmsg = nlmsg_data(nlh);
2636 nfmsg->nfgen_family = exp->tuple.src.l3num;
2637 nfmsg->version = NFNETLINK_V0;
2638 nfmsg->res_id = 0;
2639
2640 rcu_read_lock();
2641 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2642 goto nla_put_failure;
2643 rcu_read_unlock();
2644
2645 nlmsg_end(skb, nlh);
2646 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2647 return 0;
2648
2649 nla_put_failure:
2650 rcu_read_unlock();
2651 nlmsg_cancel(skb, nlh);
2652 nlmsg_failure:
2653 kfree_skb(skb);
2654 errout:
2655 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2656 return 0;
2657 }
2658 #endif
2659 static int ctnetlink_exp_done(struct netlink_callback *cb)
2660 {
2661 if (cb->args[1])
2662 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2663 return 0;
2664 }
2665
2666 static int
2667 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2668 {
2669 struct net *net = sock_net(skb->sk);
2670 struct nf_conntrack_expect *exp, *last;
2671 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2672 u_int8_t l3proto = nfmsg->nfgen_family;
2673
2674 rcu_read_lock();
2675 last = (struct nf_conntrack_expect *)cb->args[1];
2676 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2677 restart:
2678 hlist_for_each_entry(exp, &nf_ct_expect_hash[cb->args[0]],
2679 hnode) {
2680 if (l3proto && exp->tuple.src.l3num != l3proto)
2681 continue;
2682
2683 if (!net_eq(nf_ct_net(exp->master), net))
2684 continue;
2685
2686 if (cb->args[1]) {
2687 if (exp != last)
2688 continue;
2689 cb->args[1] = 0;
2690 }
2691 if (ctnetlink_exp_fill_info(skb,
2692 NETLINK_CB(cb->skb).portid,
2693 cb->nlh->nlmsg_seq,
2694 IPCTNL_MSG_EXP_NEW,
2695 exp) < 0) {
2696 if (!refcount_inc_not_zero(&exp->use))
2697 continue;
2698 cb->args[1] = (unsigned long)exp;
2699 goto out;
2700 }
2701 }
2702 if (cb->args[1]) {
2703 cb->args[1] = 0;
2704 goto restart;
2705 }
2706 }
2707 out:
2708 rcu_read_unlock();
2709 if (last)
2710 nf_ct_expect_put(last);
2711
2712 return skb->len;
2713 }
2714
2715 static int
2716 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2717 {
2718 struct nf_conntrack_expect *exp, *last;
2719 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2720 struct nf_conn *ct = cb->data;
2721 struct nf_conn_help *help = nfct_help(ct);
2722 u_int8_t l3proto = nfmsg->nfgen_family;
2723
2724 if (cb->args[0])
2725 return 0;
2726
2727 rcu_read_lock();
2728 last = (struct nf_conntrack_expect *)cb->args[1];
2729 restart:
2730 hlist_for_each_entry(exp, &help->expectations, lnode) {
2731 if (l3proto && exp->tuple.src.l3num != l3proto)
2732 continue;
2733 if (cb->args[1]) {
2734 if (exp != last)
2735 continue;
2736 cb->args[1] = 0;
2737 }
2738 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2739 cb->nlh->nlmsg_seq,
2740 IPCTNL_MSG_EXP_NEW,
2741 exp) < 0) {
2742 if (!refcount_inc_not_zero(&exp->use))
2743 continue;
2744 cb->args[1] = (unsigned long)exp;
2745 goto out;
2746 }
2747 }
2748 if (cb->args[1]) {
2749 cb->args[1] = 0;
2750 goto restart;
2751 }
2752 cb->args[0] = 1;
2753 out:
2754 rcu_read_unlock();
2755 if (last)
2756 nf_ct_expect_put(last);
2757
2758 return skb->len;
2759 }
2760
2761 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
2762 struct sk_buff *skb,
2763 const struct nlmsghdr *nlh,
2764 const struct nlattr * const cda[])
2765 {
2766 int err;
2767 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2768 u_int8_t u3 = nfmsg->nfgen_family;
2769 struct nf_conntrack_tuple tuple;
2770 struct nf_conntrack_tuple_hash *h;
2771 struct nf_conn *ct;
2772 struct nf_conntrack_zone zone;
2773 struct netlink_dump_control c = {
2774 .dump = ctnetlink_exp_ct_dump_table,
2775 .done = ctnetlink_exp_done,
2776 };
2777
2778 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2779 u3, NULL);
2780 if (err < 0)
2781 return err;
2782
2783 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2784 if (err < 0)
2785 return err;
2786
2787 h = nf_conntrack_find_get(net, &zone, &tuple);
2788 if (!h)
2789 return -ENOENT;
2790
2791 ct = nf_ct_tuplehash_to_ctrack(h);
2792 c.data = ct;
2793
2794 err = netlink_dump_start(ctnl, skb, nlh, &c);
2795 nf_ct_put(ct);
2796
2797 return err;
2798 }
2799
2800 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
2801 struct sk_buff *skb, const struct nlmsghdr *nlh,
2802 const struct nlattr * const cda[])
2803 {
2804 struct nf_conntrack_tuple tuple;
2805 struct nf_conntrack_expect *exp;
2806 struct sk_buff *skb2;
2807 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2808 u_int8_t u3 = nfmsg->nfgen_family;
2809 struct nf_conntrack_zone zone;
2810 int err;
2811
2812 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2813 if (cda[CTA_EXPECT_MASTER])
2814 return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda);
2815 else {
2816 struct netlink_dump_control c = {
2817 .dump = ctnetlink_exp_dump_table,
2818 .done = ctnetlink_exp_done,
2819 };
2820 return netlink_dump_start(ctnl, skb, nlh, &c);
2821 }
2822 }
2823
2824 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2825 if (err < 0)
2826 return err;
2827
2828 if (cda[CTA_EXPECT_TUPLE])
2829 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2830 u3, NULL);
2831 else if (cda[CTA_EXPECT_MASTER])
2832 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2833 u3, NULL);
2834 else
2835 return -EINVAL;
2836
2837 if (err < 0)
2838 return err;
2839
2840 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2841 if (!exp)
2842 return -ENOENT;
2843
2844 if (cda[CTA_EXPECT_ID]) {
2845 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2846 if (ntohl(id) != (u32)(unsigned long)exp) {
2847 nf_ct_expect_put(exp);
2848 return -ENOENT;
2849 }
2850 }
2851
2852 err = -ENOMEM;
2853 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2854 if (skb2 == NULL) {
2855 nf_ct_expect_put(exp);
2856 goto out;
2857 }
2858
2859 rcu_read_lock();
2860 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2861 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2862 rcu_read_unlock();
2863 nf_ct_expect_put(exp);
2864 if (err <= 0)
2865 goto free;
2866
2867 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2868 if (err < 0)
2869 goto out;
2870
2871 return 0;
2872
2873 free:
2874 kfree_skb(skb2);
2875 out:
2876 /* this avoids a loop in nfnetlink. */
2877 return err == -EAGAIN ? -ENOBUFS : err;
2878 }
2879
2880 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
2881 struct sk_buff *skb, const struct nlmsghdr *nlh,
2882 const struct nlattr * const cda[])
2883 {
2884 struct nf_conntrack_expect *exp;
2885 struct nf_conntrack_tuple tuple;
2886 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2887 struct hlist_node *next;
2888 u_int8_t u3 = nfmsg->nfgen_family;
2889 struct nf_conntrack_zone zone;
2890 unsigned int i;
2891 int err;
2892
2893 if (cda[CTA_EXPECT_TUPLE]) {
2894 /* delete a single expect by tuple */
2895 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2896 if (err < 0)
2897 return err;
2898
2899 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2900 u3, NULL);
2901 if (err < 0)
2902 return err;
2903
2904 /* bump usage count to 2 */
2905 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2906 if (!exp)
2907 return -ENOENT;
2908
2909 if (cda[CTA_EXPECT_ID]) {
2910 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2911 if (ntohl(id) != (u32)(unsigned long)exp) {
2912 nf_ct_expect_put(exp);
2913 return -ENOENT;
2914 }
2915 }
2916
2917 /* after list removal, usage count == 1 */
2918 spin_lock_bh(&nf_conntrack_expect_lock);
2919 if (del_timer(&exp->timeout)) {
2920 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2921 nlmsg_report(nlh));
2922 nf_ct_expect_put(exp);
2923 }
2924 spin_unlock_bh(&nf_conntrack_expect_lock);
2925 /* have to put what we 'get' above.
2926 * after this line usage count == 0 */
2927 nf_ct_expect_put(exp);
2928 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2929 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2930 struct nf_conn_help *m_help;
2931
2932 /* delete all expectations for this helper */
2933 spin_lock_bh(&nf_conntrack_expect_lock);
2934 for (i = 0; i < nf_ct_expect_hsize; i++) {
2935 hlist_for_each_entry_safe(exp, next,
2936 &nf_ct_expect_hash[i],
2937 hnode) {
2938
2939 if (!net_eq(nf_ct_exp_net(exp), net))
2940 continue;
2941
2942 m_help = nfct_help(exp->master);
2943 if (!strcmp(m_help->helper->name, name) &&
2944 del_timer(&exp->timeout)) {
2945 nf_ct_unlink_expect_report(exp,
2946 NETLINK_CB(skb).portid,
2947 nlmsg_report(nlh));
2948 nf_ct_expect_put(exp);
2949 }
2950 }
2951 }
2952 spin_unlock_bh(&nf_conntrack_expect_lock);
2953 } else {
2954 /* This basically means we have to flush everything*/
2955 spin_lock_bh(&nf_conntrack_expect_lock);
2956 for (i = 0; i < nf_ct_expect_hsize; i++) {
2957 hlist_for_each_entry_safe(exp, next,
2958 &nf_ct_expect_hash[i],
2959 hnode) {
2960
2961 if (!net_eq(nf_ct_exp_net(exp), net))
2962 continue;
2963
2964 if (del_timer(&exp->timeout)) {
2965 nf_ct_unlink_expect_report(exp,
2966 NETLINK_CB(skb).portid,
2967 nlmsg_report(nlh));
2968 nf_ct_expect_put(exp);
2969 }
2970 }
2971 }
2972 spin_unlock_bh(&nf_conntrack_expect_lock);
2973 }
2974
2975 return 0;
2976 }
2977 static int
2978 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2979 const struct nlattr * const cda[])
2980 {
2981 if (cda[CTA_EXPECT_TIMEOUT]) {
2982 if (!del_timer(&x->timeout))
2983 return -ETIME;
2984
2985 x->timeout.expires = jiffies +
2986 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2987 add_timer(&x->timeout);
2988 }
2989 return 0;
2990 }
2991
2992 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2993 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2994 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2995 };
2996
2997 static int
2998 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2999 struct nf_conntrack_expect *exp,
3000 u_int8_t u3)
3001 {
3002 #ifdef CONFIG_NF_NAT_NEEDED
3003 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3004 struct nf_conntrack_tuple nat_tuple = {};
3005 int err;
3006
3007 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
3008 if (err < 0)
3009 return err;
3010
3011 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3012 return -EINVAL;
3013
3014 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3015 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3016 u3, NULL);
3017 if (err < 0)
3018 return err;
3019
3020 exp->saved_addr = nat_tuple.src.u3;
3021 exp->saved_proto = nat_tuple.src.u;
3022 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3023
3024 return 0;
3025 #else
3026 return -EOPNOTSUPP;
3027 #endif
3028 }
3029
3030 static struct nf_conntrack_expect *
3031 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3032 struct nf_conntrack_helper *helper,
3033 struct nf_conntrack_tuple *tuple,
3034 struct nf_conntrack_tuple *mask)
3035 {
3036 u_int32_t class = 0;
3037 struct nf_conntrack_expect *exp;
3038 struct nf_conn_help *help;
3039 int err;
3040
3041 help = nfct_help(ct);
3042 if (!help)
3043 return ERR_PTR(-EOPNOTSUPP);
3044
3045 if (cda[CTA_EXPECT_CLASS] && helper) {
3046 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3047 if (class > helper->expect_class_max)
3048 return ERR_PTR(-EINVAL);
3049 }
3050 exp = nf_ct_expect_alloc(ct);
3051 if (!exp)
3052 return ERR_PTR(-ENOMEM);
3053
3054 if (cda[CTA_EXPECT_FLAGS]) {
3055 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3056 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3057 } else {
3058 exp->flags = 0;
3059 }
3060 if (cda[CTA_EXPECT_FN]) {
3061 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3062 struct nf_ct_helper_expectfn *expfn;
3063
3064 expfn = nf_ct_helper_expectfn_find_by_name(name);
3065 if (expfn == NULL) {
3066 err = -EINVAL;
3067 goto err_out;
3068 }
3069 exp->expectfn = expfn->expectfn;
3070 } else
3071 exp->expectfn = NULL;
3072
3073 exp->class = class;
3074 exp->master = ct;
3075 exp->helper = helper;
3076 exp->tuple = *tuple;
3077 exp->mask.src.u3 = mask->src.u3;
3078 exp->mask.src.u.all = mask->src.u.all;
3079
3080 if (cda[CTA_EXPECT_NAT]) {
3081 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3082 exp, nf_ct_l3num(ct));
3083 if (err < 0)
3084 goto err_out;
3085 }
3086 return exp;
3087 err_out:
3088 nf_ct_expect_put(exp);
3089 return ERR_PTR(err);
3090 }
3091
3092 static int
3093 ctnetlink_create_expect(struct net *net,
3094 const struct nf_conntrack_zone *zone,
3095 const struct nlattr * const cda[],
3096 u_int8_t u3, u32 portid, int report)
3097 {
3098 struct nf_conntrack_tuple tuple, mask, master_tuple;
3099 struct nf_conntrack_tuple_hash *h = NULL;
3100 struct nf_conntrack_helper *helper = NULL;
3101 struct nf_conntrack_expect *exp;
3102 struct nf_conn *ct;
3103 int err;
3104
3105 /* caller guarantees that those three CTA_EXPECT_* exist */
3106 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3107 u3, NULL);
3108 if (err < 0)
3109 return err;
3110 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3111 u3, NULL);
3112 if (err < 0)
3113 return err;
3114 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3115 u3, NULL);
3116 if (err < 0)
3117 return err;
3118
3119 /* Look for master conntrack of this expectation */
3120 h = nf_conntrack_find_get(net, zone, &master_tuple);
3121 if (!h)
3122 return -ENOENT;
3123 ct = nf_ct_tuplehash_to_ctrack(h);
3124
3125 if (cda[CTA_EXPECT_HELP_NAME]) {
3126 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3127
3128 helper = __nf_conntrack_helper_find(helpname, u3,
3129 nf_ct_protonum(ct));
3130 if (helper == NULL) {
3131 #ifdef CONFIG_MODULES
3132 if (request_module("nfct-helper-%s", helpname) < 0) {
3133 err = -EOPNOTSUPP;
3134 goto err_ct;
3135 }
3136 helper = __nf_conntrack_helper_find(helpname, u3,
3137 nf_ct_protonum(ct));
3138 if (helper) {
3139 err = -EAGAIN;
3140 goto err_ct;
3141 }
3142 #endif
3143 err = -EOPNOTSUPP;
3144 goto err_ct;
3145 }
3146 }
3147
3148 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3149 if (IS_ERR(exp)) {
3150 err = PTR_ERR(exp);
3151 goto err_ct;
3152 }
3153
3154 err = nf_ct_expect_related_report(exp, portid, report);
3155 nf_ct_expect_put(exp);
3156 err_ct:
3157 nf_ct_put(ct);
3158 return err;
3159 }
3160
3161 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3162 struct sk_buff *skb, const struct nlmsghdr *nlh,
3163 const struct nlattr * const cda[])
3164 {
3165 struct nf_conntrack_tuple tuple;
3166 struct nf_conntrack_expect *exp;
3167 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3168 u_int8_t u3 = nfmsg->nfgen_family;
3169 struct nf_conntrack_zone zone;
3170 int err;
3171
3172 if (!cda[CTA_EXPECT_TUPLE]
3173 || !cda[CTA_EXPECT_MASK]
3174 || !cda[CTA_EXPECT_MASTER])
3175 return -EINVAL;
3176
3177 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3178 if (err < 0)
3179 return err;
3180
3181 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3182 u3, NULL);
3183 if (err < 0)
3184 return err;
3185
3186 spin_lock_bh(&nf_conntrack_expect_lock);
3187 exp = __nf_ct_expect_find(net, &zone, &tuple);
3188 if (!exp) {
3189 spin_unlock_bh(&nf_conntrack_expect_lock);
3190 err = -ENOENT;
3191 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3192 err = ctnetlink_create_expect(net, &zone, cda, u3,
3193 NETLINK_CB(skb).portid,
3194 nlmsg_report(nlh));
3195 }
3196 return err;
3197 }
3198
3199 err = -EEXIST;
3200 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3201 err = ctnetlink_change_expect(exp, cda);
3202 spin_unlock_bh(&nf_conntrack_expect_lock);
3203
3204 return err;
3205 }
3206
3207 static int
3208 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3209 const struct ip_conntrack_stat *st)
3210 {
3211 struct nlmsghdr *nlh;
3212 struct nfgenmsg *nfmsg;
3213 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3214
3215 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
3216 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3217 if (nlh == NULL)
3218 goto nlmsg_failure;
3219
3220 nfmsg = nlmsg_data(nlh);
3221 nfmsg->nfgen_family = AF_UNSPEC;
3222 nfmsg->version = NFNETLINK_V0;
3223 nfmsg->res_id = htons(cpu);
3224
3225 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3226 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3227 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3228 goto nla_put_failure;
3229
3230 nlmsg_end(skb, nlh);
3231 return skb->len;
3232
3233 nla_put_failure:
3234 nlmsg_failure:
3235 nlmsg_cancel(skb, nlh);
3236 return -1;
3237 }
3238
3239 static int
3240 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3241 {
3242 int cpu;
3243 struct net *net = sock_net(skb->sk);
3244
3245 if (cb->args[0] == nr_cpu_ids)
3246 return 0;
3247
3248 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3249 const struct ip_conntrack_stat *st;
3250
3251 if (!cpu_possible(cpu))
3252 continue;
3253
3254 st = per_cpu_ptr(net->ct.stat, cpu);
3255 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3256 cb->nlh->nlmsg_seq,
3257 cpu, st) < 0)
3258 break;
3259 }
3260 cb->args[0] = cpu;
3261
3262 return skb->len;
3263 }
3264
3265 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3266 struct sk_buff *skb,
3267 const struct nlmsghdr *nlh,
3268 const struct nlattr * const cda[])
3269 {
3270 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3271 struct netlink_dump_control c = {
3272 .dump = ctnetlink_exp_stat_cpu_dump,
3273 };
3274 return netlink_dump_start(ctnl, skb, nlh, &c);
3275 }
3276
3277 return 0;
3278 }
3279
3280 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3281 static struct nf_ct_event_notifier ctnl_notifier = {
3282 .fcn = ctnetlink_conntrack_event,
3283 };
3284
3285 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3286 .fcn = ctnetlink_expect_event,
3287 };
3288 #endif
3289
3290 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3291 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3292 .attr_count = CTA_MAX,
3293 .policy = ct_nla_policy },
3294 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3295 .attr_count = CTA_MAX,
3296 .policy = ct_nla_policy },
3297 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3298 .attr_count = CTA_MAX,
3299 .policy = ct_nla_policy },
3300 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3301 .attr_count = CTA_MAX,
3302 .policy = ct_nla_policy },
3303 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3304 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3305 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3306 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3307 };
3308
3309 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3310 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3311 .attr_count = CTA_EXPECT_MAX,
3312 .policy = exp_nla_policy },
3313 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3314 .attr_count = CTA_EXPECT_MAX,
3315 .policy = exp_nla_policy },
3316 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3317 .attr_count = CTA_EXPECT_MAX,
3318 .policy = exp_nla_policy },
3319 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3320 };
3321
3322 static const struct nfnetlink_subsystem ctnl_subsys = {
3323 .name = "conntrack",
3324 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3325 .cb_count = IPCTNL_MSG_MAX,
3326 .cb = ctnl_cb,
3327 };
3328
3329 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3330 .name = "conntrack_expect",
3331 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3332 .cb_count = IPCTNL_MSG_EXP_MAX,
3333 .cb = ctnl_exp_cb,
3334 };
3335
3336 MODULE_ALIAS("ip_conntrack_netlink");
3337 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3338 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3339
3340 static int __net_init ctnetlink_net_init(struct net *net)
3341 {
3342 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3343 int ret;
3344
3345 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3346 if (ret < 0) {
3347 pr_err("ctnetlink_init: cannot register notifier.\n");
3348 goto err_out;
3349 }
3350
3351 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3352 if (ret < 0) {
3353 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3354 goto err_unreg_notifier;
3355 }
3356 #endif
3357 return 0;
3358
3359 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3360 err_unreg_notifier:
3361 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3362 err_out:
3363 return ret;
3364 #endif
3365 }
3366
3367 static void ctnetlink_net_exit(struct net *net)
3368 {
3369 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3370 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3371 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3372 #endif
3373 }
3374
3375 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3376 {
3377 struct net *net;
3378
3379 list_for_each_entry(net, net_exit_list, exit_list)
3380 ctnetlink_net_exit(net);
3381 }
3382
3383 static struct pernet_operations ctnetlink_net_ops = {
3384 .init = ctnetlink_net_init,
3385 .exit_batch = ctnetlink_net_exit_batch,
3386 };
3387
3388 static int __init ctnetlink_init(void)
3389 {
3390 int ret;
3391
3392 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3393 ret = nfnetlink_subsys_register(&ctnl_subsys);
3394 if (ret < 0) {
3395 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3396 goto err_out;
3397 }
3398
3399 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3400 if (ret < 0) {
3401 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3402 goto err_unreg_subsys;
3403 }
3404
3405 ret = register_pernet_subsys(&ctnetlink_net_ops);
3406 if (ret < 0) {
3407 pr_err("ctnetlink_init: cannot register pernet operations\n");
3408 goto err_unreg_exp_subsys;
3409 }
3410 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3411 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3412 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3413 #endif
3414 return 0;
3415
3416 err_unreg_exp_subsys:
3417 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3418 err_unreg_subsys:
3419 nfnetlink_subsys_unregister(&ctnl_subsys);
3420 err_out:
3421 return ret;
3422 }
3423
3424 static void __exit ctnetlink_exit(void)
3425 {
3426 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3427
3428 unregister_pernet_subsys(&ctnetlink_net_ops);
3429 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3430 nfnetlink_subsys_unregister(&ctnl_subsys);
3431 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3432 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3433 #endif
3434 synchronize_rcu();
3435 }
3436
3437 module_init(ctnetlink_init);
3438 module_exit(ctnetlink_exit);
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