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[mirror_ubuntu-bionic-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 inline int
62 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
63 const struct nf_conntrack_tuple *tuple,
64 struct nf_conntrack_l4proto *l4proto)
65 {
66 int ret = 0;
67 struct nlattr *nest_parms;
68
69 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
70 if (!nest_parms)
71 goto nla_put_failure;
72 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
73 goto nla_put_failure;
74
75 if (likely(l4proto->tuple_to_nlattr))
76 ret = l4proto->tuple_to_nlattr(skb, tuple);
77
78 nla_nest_end(skb, nest_parms);
79
80 return ret;
81
82 nla_put_failure:
83 return -1;
84 }
85
86 static inline int
87 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
88 const struct nf_conntrack_tuple *tuple,
89 struct nf_conntrack_l3proto *l3proto)
90 {
91 int ret = 0;
92 struct nlattr *nest_parms;
93
94 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
95 if (!nest_parms)
96 goto nla_put_failure;
97
98 if (likely(l3proto->tuple_to_nlattr))
99 ret = l3proto->tuple_to_nlattr(skb, tuple);
100
101 nla_nest_end(skb, nest_parms);
102
103 return ret;
104
105 nla_put_failure:
106 return -1;
107 }
108
109 static int
110 ctnetlink_dump_tuples(struct sk_buff *skb,
111 const struct nf_conntrack_tuple *tuple)
112 {
113 int ret;
114 struct nf_conntrack_l3proto *l3proto;
115 struct nf_conntrack_l4proto *l4proto;
116
117 rcu_read_lock();
118 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
119 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
120
121 if (ret >= 0) {
122 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
123 tuple->dst.protonum);
124 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
125 }
126 rcu_read_unlock();
127 return ret;
128 }
129
130 static inline int
131 ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
132 const struct nf_conntrack_zone *zone, int dir)
133 {
134 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
135 return 0;
136 if (nla_put_be16(skb, attrtype, htons(zone->id)))
137 goto nla_put_failure;
138 return 0;
139
140 nla_put_failure:
141 return -1;
142 }
143
144 static inline int
145 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
146 {
147 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
148 goto nla_put_failure;
149 return 0;
150
151 nla_put_failure:
152 return -1;
153 }
154
155 static inline int
156 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
157 {
158 long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
159
160 if (timeout < 0)
161 timeout = 0;
162
163 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
164 goto nla_put_failure;
165 return 0;
166
167 nla_put_failure:
168 return -1;
169 }
170
171 static inline int
172 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
173 {
174 struct nf_conntrack_l4proto *l4proto;
175 struct nlattr *nest_proto;
176 int ret;
177
178 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
179 if (!l4proto->to_nlattr)
180 return 0;
181
182 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
183 if (!nest_proto)
184 goto nla_put_failure;
185
186 ret = l4proto->to_nlattr(skb, nest_proto, ct);
187
188 nla_nest_end(skb, nest_proto);
189
190 return ret;
191
192 nla_put_failure:
193 return -1;
194 }
195
196 static inline int
197 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
198 {
199 struct nlattr *nest_helper;
200 const struct nf_conn_help *help = nfct_help(ct);
201 struct nf_conntrack_helper *helper;
202
203 if (!help)
204 return 0;
205
206 helper = rcu_dereference(help->helper);
207 if (!helper)
208 goto out;
209
210 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
211 if (!nest_helper)
212 goto nla_put_failure;
213 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
214 goto nla_put_failure;
215
216 if (helper->to_nlattr)
217 helper->to_nlattr(skb, ct);
218
219 nla_nest_end(skb, nest_helper);
220 out:
221 return 0;
222
223 nla_put_failure:
224 return -1;
225 }
226
227 static int
228 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
229 enum ip_conntrack_dir dir, int type)
230 {
231 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
232 struct nf_conn_counter *counter = acct->counter;
233 struct nlattr *nest_count;
234 u64 pkts, bytes;
235
236 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
237 pkts = atomic64_xchg(&counter[dir].packets, 0);
238 bytes = atomic64_xchg(&counter[dir].bytes, 0);
239 } else {
240 pkts = atomic64_read(&counter[dir].packets);
241 bytes = atomic64_read(&counter[dir].bytes);
242 }
243
244 nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
245 if (!nest_count)
246 goto nla_put_failure;
247
248 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
249 CTA_COUNTERS_PAD) ||
250 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
251 CTA_COUNTERS_PAD))
252 goto nla_put_failure;
253
254 nla_nest_end(skb, nest_count);
255
256 return 0;
257
258 nla_put_failure:
259 return -1;
260 }
261
262 static int
263 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
264 {
265 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
266
267 if (!acct)
268 return 0;
269
270 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
271 return -1;
272 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
273 return -1;
274
275 return 0;
276 }
277
278 static int
279 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
280 {
281 struct nlattr *nest_count;
282 const struct nf_conn_tstamp *tstamp;
283
284 tstamp = nf_conn_tstamp_find(ct);
285 if (!tstamp)
286 return 0;
287
288 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
289 if (!nest_count)
290 goto nla_put_failure;
291
292 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
293 CTA_TIMESTAMP_PAD) ||
294 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
295 cpu_to_be64(tstamp->stop),
296 CTA_TIMESTAMP_PAD)))
297 goto nla_put_failure;
298 nla_nest_end(skb, nest_count);
299
300 return 0;
301
302 nla_put_failure:
303 return -1;
304 }
305
306 #ifdef CONFIG_NF_CONNTRACK_MARK
307 static inline int
308 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
309 {
310 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
311 goto nla_put_failure;
312 return 0;
313
314 nla_put_failure:
315 return -1;
316 }
317 #else
318 #define ctnetlink_dump_mark(a, b) (0)
319 #endif
320
321 #ifdef CONFIG_NF_CONNTRACK_SECMARK
322 static inline int
323 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
324 {
325 struct nlattr *nest_secctx;
326 int len, ret;
327 char *secctx;
328
329 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
330 if (ret)
331 return 0;
332
333 ret = -1;
334 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
335 if (!nest_secctx)
336 goto nla_put_failure;
337
338 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
339 goto nla_put_failure;
340 nla_nest_end(skb, nest_secctx);
341
342 ret = 0;
343 nla_put_failure:
344 security_release_secctx(secctx, len);
345 return ret;
346 }
347 #else
348 #define ctnetlink_dump_secctx(a, b) (0)
349 #endif
350
351 #ifdef CONFIG_NF_CONNTRACK_LABELS
352 static int ctnetlink_label_size(const struct nf_conn *ct)
353 {
354 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
355
356 if (!labels)
357 return 0;
358 return nla_total_size(labels->words * sizeof(long));
359 }
360
361 static int
362 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
363 {
364 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
365 unsigned int len, i;
366
367 if (!labels)
368 return 0;
369
370 len = labels->words * sizeof(long);
371 i = 0;
372 do {
373 if (labels->bits[i] != 0)
374 return nla_put(skb, CTA_LABELS, len, labels->bits);
375 i++;
376 } while (i < labels->words);
377
378 return 0;
379 }
380 #else
381 #define ctnetlink_dump_labels(a, b) (0)
382 #define ctnetlink_label_size(a) (0)
383 #endif
384
385 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
386
387 static inline int
388 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
389 {
390 struct nlattr *nest_parms;
391
392 if (!(ct->status & IPS_EXPECTED))
393 return 0;
394
395 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
396 if (!nest_parms)
397 goto nla_put_failure;
398 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
399 goto nla_put_failure;
400 nla_nest_end(skb, nest_parms);
401
402 return 0;
403
404 nla_put_failure:
405 return -1;
406 }
407
408 static int
409 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
410 {
411 struct nlattr *nest_parms;
412
413 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
414 if (!nest_parms)
415 goto nla_put_failure;
416
417 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
418 htonl(seq->correction_pos)) ||
419 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
420 htonl(seq->offset_before)) ||
421 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
422 htonl(seq->offset_after)))
423 goto nla_put_failure;
424
425 nla_nest_end(skb, nest_parms);
426
427 return 0;
428
429 nla_put_failure:
430 return -1;
431 }
432
433 static inline int
434 ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
435 {
436 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
437 struct nf_ct_seqadj *seq;
438
439 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
440 return 0;
441
442 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
443 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
444 return -1;
445
446 seq = &seqadj->seq[IP_CT_DIR_REPLY];
447 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
448 return -1;
449
450 return 0;
451 }
452
453 static inline int
454 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
455 {
456 if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
457 goto nla_put_failure;
458 return 0;
459
460 nla_put_failure:
461 return -1;
462 }
463
464 static inline int
465 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
466 {
467 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
468 goto nla_put_failure;
469 return 0;
470
471 nla_put_failure:
472 return -1;
473 }
474
475 static int
476 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
477 struct nf_conn *ct)
478 {
479 const struct nf_conntrack_zone *zone;
480 struct nlmsghdr *nlh;
481 struct nfgenmsg *nfmsg;
482 struct nlattr *nest_parms;
483 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
484
485 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
486 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
487 if (nlh == NULL)
488 goto nlmsg_failure;
489
490 nfmsg = nlmsg_data(nlh);
491 nfmsg->nfgen_family = nf_ct_l3num(ct);
492 nfmsg->version = NFNETLINK_V0;
493 nfmsg->res_id = 0;
494
495 zone = nf_ct_zone(ct);
496
497 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
498 if (!nest_parms)
499 goto nla_put_failure;
500 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
501 goto nla_put_failure;
502 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
503 NF_CT_ZONE_DIR_ORIG) < 0)
504 goto nla_put_failure;
505 nla_nest_end(skb, nest_parms);
506
507 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
508 if (!nest_parms)
509 goto nla_put_failure;
510 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
511 goto nla_put_failure;
512 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
513 NF_CT_ZONE_DIR_REPL) < 0)
514 goto nla_put_failure;
515 nla_nest_end(skb, nest_parms);
516
517 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
518 NF_CT_DEFAULT_ZONE_DIR) < 0)
519 goto nla_put_failure;
520
521 if (ctnetlink_dump_status(skb, ct) < 0 ||
522 ctnetlink_dump_timeout(skb, ct) < 0 ||
523 ctnetlink_dump_acct(skb, ct, type) < 0 ||
524 ctnetlink_dump_timestamp(skb, ct) < 0 ||
525 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
526 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
527 ctnetlink_dump_mark(skb, ct) < 0 ||
528 ctnetlink_dump_secctx(skb, ct) < 0 ||
529 ctnetlink_dump_labels(skb, ct) < 0 ||
530 ctnetlink_dump_id(skb, ct) < 0 ||
531 ctnetlink_dump_use(skb, ct) < 0 ||
532 ctnetlink_dump_master(skb, ct) < 0 ||
533 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
534 goto nla_put_failure;
535
536 nlmsg_end(skb, nlh);
537 return skb->len;
538
539 nlmsg_failure:
540 nla_put_failure:
541 nlmsg_cancel(skb, nlh);
542 return -1;
543 }
544
545 static inline size_t
546 ctnetlink_proto_size(const struct nf_conn *ct)
547 {
548 struct nf_conntrack_l3proto *l3proto;
549 struct nf_conntrack_l4proto *l4proto;
550 size_t len = 0;
551
552 rcu_read_lock();
553 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
554 len += l3proto->nla_size;
555
556 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
557 len += l4proto->nla_size;
558 rcu_read_unlock();
559
560 return len;
561 }
562
563 static inline size_t
564 ctnetlink_acct_size(const struct nf_conn *ct)
565 {
566 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
567 return 0;
568 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
569 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
570 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
571 ;
572 }
573
574 static inline int
575 ctnetlink_secctx_size(const struct nf_conn *ct)
576 {
577 #ifdef CONFIG_NF_CONNTRACK_SECMARK
578 int len, ret;
579
580 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
581 if (ret)
582 return 0;
583
584 return nla_total_size(0) /* CTA_SECCTX */
585 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
586 #else
587 return 0;
588 #endif
589 }
590
591 static inline size_t
592 ctnetlink_timestamp_size(const struct nf_conn *ct)
593 {
594 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
595 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
596 return 0;
597 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
598 #else
599 return 0;
600 #endif
601 }
602
603 static inline size_t
604 ctnetlink_nlmsg_size(const struct nf_conn *ct)
605 {
606 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
607 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
608 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
609 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
610 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
611 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
612 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
613 + ctnetlink_acct_size(ct)
614 + ctnetlink_timestamp_size(ct)
615 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
616 + nla_total_size(0) /* CTA_PROTOINFO */
617 + nla_total_size(0) /* CTA_HELP */
618 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
619 + ctnetlink_secctx_size(ct)
620 #ifdef CONFIG_NF_NAT_NEEDED
621 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
622 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
623 #endif
624 #ifdef CONFIG_NF_CONNTRACK_MARK
625 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
626 #endif
627 #ifdef CONFIG_NF_CONNTRACK_ZONES
628 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
629 #endif
630 + ctnetlink_proto_size(ct)
631 + ctnetlink_label_size(ct)
632 ;
633 }
634
635 #ifdef CONFIG_NF_CONNTRACK_EVENTS
636 static int
637 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
638 {
639 const struct nf_conntrack_zone *zone;
640 struct net *net;
641 struct nlmsghdr *nlh;
642 struct nfgenmsg *nfmsg;
643 struct nlattr *nest_parms;
644 struct nf_conn *ct = item->ct;
645 struct sk_buff *skb;
646 unsigned int type;
647 unsigned int flags = 0, group;
648 int err;
649
650 /* ignore our fake conntrack entry */
651 if (nf_ct_is_untracked(ct))
652 return 0;
653
654 if (events & (1 << IPCT_DESTROY)) {
655 type = IPCTNL_MSG_CT_DELETE;
656 group = NFNLGRP_CONNTRACK_DESTROY;
657 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
658 type = IPCTNL_MSG_CT_NEW;
659 flags = NLM_F_CREATE|NLM_F_EXCL;
660 group = NFNLGRP_CONNTRACK_NEW;
661 } else if (events) {
662 type = IPCTNL_MSG_CT_NEW;
663 group = NFNLGRP_CONNTRACK_UPDATE;
664 } else
665 return 0;
666
667 net = nf_ct_net(ct);
668 if (!item->report && !nfnetlink_has_listeners(net, group))
669 return 0;
670
671 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
672 if (skb == NULL)
673 goto errout;
674
675 type |= NFNL_SUBSYS_CTNETLINK << 8;
676 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
677 if (nlh == NULL)
678 goto nlmsg_failure;
679
680 nfmsg = nlmsg_data(nlh);
681 nfmsg->nfgen_family = nf_ct_l3num(ct);
682 nfmsg->version = NFNETLINK_V0;
683 nfmsg->res_id = 0;
684
685 rcu_read_lock();
686 zone = nf_ct_zone(ct);
687
688 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
689 if (!nest_parms)
690 goto nla_put_failure;
691 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
692 goto nla_put_failure;
693 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
694 NF_CT_ZONE_DIR_ORIG) < 0)
695 goto nla_put_failure;
696 nla_nest_end(skb, nest_parms);
697
698 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
699 if (!nest_parms)
700 goto nla_put_failure;
701 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
702 goto nla_put_failure;
703 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
704 NF_CT_ZONE_DIR_REPL) < 0)
705 goto nla_put_failure;
706 nla_nest_end(skb, nest_parms);
707
708 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
709 NF_CT_DEFAULT_ZONE_DIR) < 0)
710 goto nla_put_failure;
711
712 if (ctnetlink_dump_id(skb, ct) < 0)
713 goto nla_put_failure;
714
715 if (ctnetlink_dump_status(skb, ct) < 0)
716 goto nla_put_failure;
717
718 if (events & (1 << IPCT_DESTROY)) {
719 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
720 ctnetlink_dump_timestamp(skb, ct) < 0)
721 goto nla_put_failure;
722 } else {
723 if (ctnetlink_dump_timeout(skb, ct) < 0)
724 goto nla_put_failure;
725
726 if (events & (1 << IPCT_PROTOINFO)
727 && ctnetlink_dump_protoinfo(skb, ct) < 0)
728 goto nla_put_failure;
729
730 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
731 && ctnetlink_dump_helpinfo(skb, ct) < 0)
732 goto nla_put_failure;
733
734 #ifdef CONFIG_NF_CONNTRACK_SECMARK
735 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
736 && ctnetlink_dump_secctx(skb, ct) < 0)
737 goto nla_put_failure;
738 #endif
739 if (events & (1 << IPCT_LABEL) &&
740 ctnetlink_dump_labels(skb, ct) < 0)
741 goto nla_put_failure;
742
743 if (events & (1 << IPCT_RELATED) &&
744 ctnetlink_dump_master(skb, ct) < 0)
745 goto nla_put_failure;
746
747 if (events & (1 << IPCT_SEQADJ) &&
748 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
749 goto nla_put_failure;
750 }
751
752 #ifdef CONFIG_NF_CONNTRACK_MARK
753 if ((events & (1 << IPCT_MARK) || ct->mark)
754 && ctnetlink_dump_mark(skb, ct) < 0)
755 goto nla_put_failure;
756 #endif
757 rcu_read_unlock();
758
759 nlmsg_end(skb, nlh);
760 err = nfnetlink_send(skb, net, item->portid, group, item->report,
761 GFP_ATOMIC);
762 if (err == -ENOBUFS || err == -EAGAIN)
763 return -ENOBUFS;
764
765 return 0;
766
767 nla_put_failure:
768 rcu_read_unlock();
769 nlmsg_cancel(skb, nlh);
770 nlmsg_failure:
771 kfree_skb(skb);
772 errout:
773 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
774 return -ENOBUFS;
775
776 return 0;
777 }
778 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
779
780 static int ctnetlink_done(struct netlink_callback *cb)
781 {
782 if (cb->args[1])
783 nf_ct_put((struct nf_conn *)cb->args[1]);
784 kfree(cb->data);
785 return 0;
786 }
787
788 struct ctnetlink_filter {
789 struct {
790 u_int32_t val;
791 u_int32_t mask;
792 } mark;
793 };
794
795 static struct ctnetlink_filter *
796 ctnetlink_alloc_filter(const struct nlattr * const cda[])
797 {
798 #ifdef CONFIG_NF_CONNTRACK_MARK
799 struct ctnetlink_filter *filter;
800
801 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
802 if (filter == NULL)
803 return ERR_PTR(-ENOMEM);
804
805 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
806 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
807
808 return filter;
809 #else
810 return ERR_PTR(-EOPNOTSUPP);
811 #endif
812 }
813
814 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
815 {
816 struct ctnetlink_filter *filter = data;
817
818 if (filter == NULL)
819 return 1;
820
821 #ifdef CONFIG_NF_CONNTRACK_MARK
822 if ((ct->mark & filter->mark.mask) == filter->mark.val)
823 return 1;
824 #endif
825
826 return 0;
827 }
828
829 static int
830 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
831 {
832 struct net *net = sock_net(skb->sk);
833 struct nf_conn *ct, *last;
834 struct nf_conntrack_tuple_hash *h;
835 struct hlist_nulls_node *n;
836 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
837 u_int8_t l3proto = nfmsg->nfgen_family;
838 int res;
839 spinlock_t *lockp;
840
841 last = (struct nf_conn *)cb->args[1];
842
843 local_bh_disable();
844 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
845 restart:
846 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
847 nf_conntrack_lock(lockp);
848 if (cb->args[0] >= net->ct.htable_size) {
849 spin_unlock(lockp);
850 goto out;
851 }
852 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
853 hnnode) {
854 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
855 continue;
856 ct = nf_ct_tuplehash_to_ctrack(h);
857 /* Dump entries of a given L3 protocol number.
858 * If it is not specified, ie. l3proto == 0,
859 * then dump everything. */
860 if (l3proto && nf_ct_l3num(ct) != l3proto)
861 continue;
862 if (cb->args[1]) {
863 if (ct != last)
864 continue;
865 cb->args[1] = 0;
866 }
867 if (!ctnetlink_filter_match(ct, cb->data))
868 continue;
869
870 rcu_read_lock();
871 res =
872 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
873 cb->nlh->nlmsg_seq,
874 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
875 ct);
876 rcu_read_unlock();
877 if (res < 0) {
878 nf_conntrack_get(&ct->ct_general);
879 cb->args[1] = (unsigned long)ct;
880 spin_unlock(lockp);
881 goto out;
882 }
883 }
884 spin_unlock(lockp);
885 if (cb->args[1]) {
886 cb->args[1] = 0;
887 goto restart;
888 }
889 }
890 out:
891 local_bh_enable();
892 if (last)
893 nf_ct_put(last);
894
895 return skb->len;
896 }
897
898 static inline int
899 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
900 {
901 struct nlattr *tb[CTA_IP_MAX+1];
902 struct nf_conntrack_l3proto *l3proto;
903 int ret = 0;
904
905 ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
906 if (ret < 0)
907 return ret;
908
909 rcu_read_lock();
910 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
911
912 if (likely(l3proto->nlattr_to_tuple)) {
913 ret = nla_validate_nested(attr, CTA_IP_MAX,
914 l3proto->nla_policy);
915 if (ret == 0)
916 ret = l3proto->nlattr_to_tuple(tb, tuple);
917 }
918
919 rcu_read_unlock();
920
921 return ret;
922 }
923
924 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
925 [CTA_PROTO_NUM] = { .type = NLA_U8 },
926 };
927
928 static inline int
929 ctnetlink_parse_tuple_proto(struct nlattr *attr,
930 struct nf_conntrack_tuple *tuple)
931 {
932 struct nlattr *tb[CTA_PROTO_MAX+1];
933 struct nf_conntrack_l4proto *l4proto;
934 int ret = 0;
935
936 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
937 if (ret < 0)
938 return ret;
939
940 if (!tb[CTA_PROTO_NUM])
941 return -EINVAL;
942 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
943
944 rcu_read_lock();
945 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
946
947 if (likely(l4proto->nlattr_to_tuple)) {
948 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
949 l4proto->nla_policy);
950 if (ret == 0)
951 ret = l4proto->nlattr_to_tuple(tb, tuple);
952 }
953
954 rcu_read_unlock();
955
956 return ret;
957 }
958
959 static int
960 ctnetlink_parse_zone(const struct nlattr *attr,
961 struct nf_conntrack_zone *zone)
962 {
963 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
964 NF_CT_DEFAULT_ZONE_DIR, 0);
965 #ifdef CONFIG_NF_CONNTRACK_ZONES
966 if (attr)
967 zone->id = ntohs(nla_get_be16(attr));
968 #else
969 if (attr)
970 return -EOPNOTSUPP;
971 #endif
972 return 0;
973 }
974
975 static int
976 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
977 struct nf_conntrack_zone *zone)
978 {
979 int ret;
980
981 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
982 return -EINVAL;
983
984 ret = ctnetlink_parse_zone(attr, zone);
985 if (ret < 0)
986 return ret;
987
988 if (type == CTA_TUPLE_REPLY)
989 zone->dir = NF_CT_ZONE_DIR_REPL;
990 else
991 zone->dir = NF_CT_ZONE_DIR_ORIG;
992
993 return 0;
994 }
995
996 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
997 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
998 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
999 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1000 };
1001
1002 static int
1003 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1004 struct nf_conntrack_tuple *tuple,
1005 enum ctattr_type type, u_int8_t l3num,
1006 struct nf_conntrack_zone *zone)
1007 {
1008 struct nlattr *tb[CTA_TUPLE_MAX+1];
1009 int err;
1010
1011 memset(tuple, 0, sizeof(*tuple));
1012
1013 err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
1014 if (err < 0)
1015 return err;
1016
1017 if (!tb[CTA_TUPLE_IP])
1018 return -EINVAL;
1019
1020 tuple->src.l3num = l3num;
1021
1022 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
1023 if (err < 0)
1024 return err;
1025
1026 if (!tb[CTA_TUPLE_PROTO])
1027 return -EINVAL;
1028
1029 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
1030 if (err < 0)
1031 return err;
1032
1033 if (tb[CTA_TUPLE_ZONE]) {
1034 if (!zone)
1035 return -EINVAL;
1036
1037 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1038 type, zone);
1039 if (err < 0)
1040 return err;
1041 }
1042
1043 /* orig and expect tuples get DIR_ORIGINAL */
1044 if (type == CTA_TUPLE_REPLY)
1045 tuple->dst.dir = IP_CT_DIR_REPLY;
1046 else
1047 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1048
1049 return 0;
1050 }
1051
1052 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1053 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1054 .len = NF_CT_HELPER_NAME_LEN - 1 },
1055 };
1056
1057 static inline int
1058 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1059 struct nlattr **helpinfo)
1060 {
1061 int err;
1062 struct nlattr *tb[CTA_HELP_MAX+1];
1063
1064 err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
1065 if (err < 0)
1066 return err;
1067
1068 if (!tb[CTA_HELP_NAME])
1069 return -EINVAL;
1070
1071 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1072
1073 if (tb[CTA_HELP_INFO])
1074 *helpinfo = tb[CTA_HELP_INFO];
1075
1076 return 0;
1077 }
1078
1079 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1080 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1081 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1082 [CTA_STATUS] = { .type = NLA_U32 },
1083 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1084 [CTA_HELP] = { .type = NLA_NESTED },
1085 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1086 [CTA_TIMEOUT] = { .type = NLA_U32 },
1087 [CTA_MARK] = { .type = NLA_U32 },
1088 [CTA_ID] = { .type = NLA_U32 },
1089 [CTA_NAT_DST] = { .type = NLA_NESTED },
1090 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1091 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1092 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1093 [CTA_ZONE] = { .type = NLA_U16 },
1094 [CTA_MARK_MASK] = { .type = NLA_U32 },
1095 [CTA_LABELS] = { .type = NLA_BINARY,
1096 .len = NF_CT_LABELS_MAX_SIZE },
1097 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1098 .len = NF_CT_LABELS_MAX_SIZE },
1099 };
1100
1101 static int ctnetlink_flush_conntrack(struct net *net,
1102 const struct nlattr * const cda[],
1103 u32 portid, int report)
1104 {
1105 struct ctnetlink_filter *filter = NULL;
1106
1107 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1108 filter = ctnetlink_alloc_filter(cda);
1109 if (IS_ERR(filter))
1110 return PTR_ERR(filter);
1111 }
1112
1113 nf_ct_iterate_cleanup(net, ctnetlink_filter_match, filter,
1114 portid, report);
1115 kfree(filter);
1116
1117 return 0;
1118 }
1119
1120 static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1121 struct sk_buff *skb,
1122 const struct nlmsghdr *nlh,
1123 const struct nlattr * const cda[])
1124 {
1125 struct nf_conntrack_tuple_hash *h;
1126 struct nf_conntrack_tuple tuple;
1127 struct nf_conn *ct;
1128 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1129 u_int8_t u3 = nfmsg->nfgen_family;
1130 struct nf_conntrack_zone zone;
1131 int err;
1132
1133 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1134 if (err < 0)
1135 return err;
1136
1137 if (cda[CTA_TUPLE_ORIG])
1138 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1139 u3, &zone);
1140 else if (cda[CTA_TUPLE_REPLY])
1141 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1142 u3, &zone);
1143 else {
1144 return ctnetlink_flush_conntrack(net, cda,
1145 NETLINK_CB(skb).portid,
1146 nlmsg_report(nlh));
1147 }
1148
1149 if (err < 0)
1150 return err;
1151
1152 h = nf_conntrack_find_get(net, &zone, &tuple);
1153 if (!h)
1154 return -ENOENT;
1155
1156 ct = nf_ct_tuplehash_to_ctrack(h);
1157
1158 if (cda[CTA_ID]) {
1159 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1160 if (id != (u32)(unsigned long)ct) {
1161 nf_ct_put(ct);
1162 return -ENOENT;
1163 }
1164 }
1165
1166 if (del_timer(&ct->timeout))
1167 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1168
1169 nf_ct_put(ct);
1170
1171 return 0;
1172 }
1173
1174 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1175 struct sk_buff *skb,
1176 const struct nlmsghdr *nlh,
1177 const struct nlattr * const cda[])
1178 {
1179 struct nf_conntrack_tuple_hash *h;
1180 struct nf_conntrack_tuple tuple;
1181 struct nf_conn *ct;
1182 struct sk_buff *skb2 = NULL;
1183 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1184 u_int8_t u3 = nfmsg->nfgen_family;
1185 struct nf_conntrack_zone zone;
1186 int err;
1187
1188 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1189 struct netlink_dump_control c = {
1190 .dump = ctnetlink_dump_table,
1191 .done = ctnetlink_done,
1192 };
1193
1194 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1195 struct ctnetlink_filter *filter;
1196
1197 filter = ctnetlink_alloc_filter(cda);
1198 if (IS_ERR(filter))
1199 return PTR_ERR(filter);
1200
1201 c.data = filter;
1202 }
1203 return netlink_dump_start(ctnl, skb, nlh, &c);
1204 }
1205
1206 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1207 if (err < 0)
1208 return err;
1209
1210 if (cda[CTA_TUPLE_ORIG])
1211 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1212 u3, &zone);
1213 else if (cda[CTA_TUPLE_REPLY])
1214 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1215 u3, &zone);
1216 else
1217 return -EINVAL;
1218
1219 if (err < 0)
1220 return err;
1221
1222 h = nf_conntrack_find_get(net, &zone, &tuple);
1223 if (!h)
1224 return -ENOENT;
1225
1226 ct = nf_ct_tuplehash_to_ctrack(h);
1227
1228 err = -ENOMEM;
1229 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1230 if (skb2 == NULL) {
1231 nf_ct_put(ct);
1232 return -ENOMEM;
1233 }
1234
1235 rcu_read_lock();
1236 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1237 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1238 rcu_read_unlock();
1239 nf_ct_put(ct);
1240 if (err <= 0)
1241 goto free;
1242
1243 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1244 if (err < 0)
1245 goto out;
1246
1247 return 0;
1248
1249 free:
1250 kfree_skb(skb2);
1251 out:
1252 /* this avoids a loop in nfnetlink. */
1253 return err == -EAGAIN ? -ENOBUFS : err;
1254 }
1255
1256 static int ctnetlink_done_list(struct netlink_callback *cb)
1257 {
1258 if (cb->args[1])
1259 nf_ct_put((struct nf_conn *)cb->args[1]);
1260 return 0;
1261 }
1262
1263 static int
1264 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1265 {
1266 struct nf_conn *ct, *last;
1267 struct nf_conntrack_tuple_hash *h;
1268 struct hlist_nulls_node *n;
1269 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1270 u_int8_t l3proto = nfmsg->nfgen_family;
1271 int res;
1272 int cpu;
1273 struct hlist_nulls_head *list;
1274 struct net *net = sock_net(skb->sk);
1275
1276 if (cb->args[2])
1277 return 0;
1278
1279 last = (struct nf_conn *)cb->args[1];
1280
1281 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1282 struct ct_pcpu *pcpu;
1283
1284 if (!cpu_possible(cpu))
1285 continue;
1286
1287 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1288 spin_lock_bh(&pcpu->lock);
1289 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1290 restart:
1291 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1292 ct = nf_ct_tuplehash_to_ctrack(h);
1293 if (l3proto && nf_ct_l3num(ct) != l3proto)
1294 continue;
1295 if (cb->args[1]) {
1296 if (ct != last)
1297 continue;
1298 cb->args[1] = 0;
1299 }
1300 rcu_read_lock();
1301 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1302 cb->nlh->nlmsg_seq,
1303 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1304 ct);
1305 rcu_read_unlock();
1306 if (res < 0) {
1307 if (!atomic_inc_not_zero(&ct->ct_general.use))
1308 continue;
1309 cb->args[0] = cpu;
1310 cb->args[1] = (unsigned long)ct;
1311 spin_unlock_bh(&pcpu->lock);
1312 goto out;
1313 }
1314 }
1315 if (cb->args[1]) {
1316 cb->args[1] = 0;
1317 goto restart;
1318 }
1319 spin_unlock_bh(&pcpu->lock);
1320 }
1321 cb->args[2] = 1;
1322 out:
1323 if (last)
1324 nf_ct_put(last);
1325
1326 return skb->len;
1327 }
1328
1329 static int
1330 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1331 {
1332 return ctnetlink_dump_list(skb, cb, true);
1333 }
1334
1335 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1336 struct sk_buff *skb,
1337 const struct nlmsghdr *nlh,
1338 const struct nlattr * const cda[])
1339 {
1340 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1341 struct netlink_dump_control c = {
1342 .dump = ctnetlink_dump_dying,
1343 .done = ctnetlink_done_list,
1344 };
1345 return netlink_dump_start(ctnl, skb, nlh, &c);
1346 }
1347
1348 return -EOPNOTSUPP;
1349 }
1350
1351 static int
1352 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1353 {
1354 return ctnetlink_dump_list(skb, cb, false);
1355 }
1356
1357 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1358 struct sk_buff *skb,
1359 const struct nlmsghdr *nlh,
1360 const struct nlattr * const cda[])
1361 {
1362 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1363 struct netlink_dump_control c = {
1364 .dump = ctnetlink_dump_unconfirmed,
1365 .done = ctnetlink_done_list,
1366 };
1367 return netlink_dump_start(ctnl, skb, nlh, &c);
1368 }
1369
1370 return -EOPNOTSUPP;
1371 }
1372
1373 #ifdef CONFIG_NF_NAT_NEEDED
1374 static int
1375 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1376 enum nf_nat_manip_type manip,
1377 const struct nlattr *attr)
1378 {
1379 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1380 int err;
1381
1382 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1383 if (!parse_nat_setup) {
1384 #ifdef CONFIG_MODULES
1385 rcu_read_unlock();
1386 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1387 if (request_module("nf-nat") < 0) {
1388 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1389 rcu_read_lock();
1390 return -EOPNOTSUPP;
1391 }
1392 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1393 rcu_read_lock();
1394 if (nfnetlink_parse_nat_setup_hook)
1395 return -EAGAIN;
1396 #endif
1397 return -EOPNOTSUPP;
1398 }
1399
1400 err = parse_nat_setup(ct, manip, attr);
1401 if (err == -EAGAIN) {
1402 #ifdef CONFIG_MODULES
1403 rcu_read_unlock();
1404 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1405 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1406 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1407 rcu_read_lock();
1408 return -EOPNOTSUPP;
1409 }
1410 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1411 rcu_read_lock();
1412 #else
1413 err = -EOPNOTSUPP;
1414 #endif
1415 }
1416 return err;
1417 }
1418 #endif
1419
1420 static int
1421 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1422 {
1423 unsigned long d;
1424 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1425 d = ct->status ^ status;
1426
1427 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1428 /* unchangeable */
1429 return -EBUSY;
1430
1431 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1432 /* SEEN_REPLY bit can only be set */
1433 return -EBUSY;
1434
1435 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1436 /* ASSURED bit can only be set */
1437 return -EBUSY;
1438
1439 /* Be careful here, modifying NAT bits can screw up things,
1440 * so don't let users modify them directly if they don't pass
1441 * nf_nat_range. */
1442 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1443 return 0;
1444 }
1445
1446 static int
1447 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1448 {
1449 #ifdef CONFIG_NF_NAT_NEEDED
1450 int ret;
1451
1452 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1453 return 0;
1454
1455 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1456 cda[CTA_NAT_DST]);
1457 if (ret < 0)
1458 return ret;
1459
1460 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1461 cda[CTA_NAT_SRC]);
1462 return ret;
1463 #else
1464 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1465 return 0;
1466 return -EOPNOTSUPP;
1467 #endif
1468 }
1469
1470 static inline int
1471 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1472 {
1473 struct nf_conntrack_helper *helper;
1474 struct nf_conn_help *help = nfct_help(ct);
1475 char *helpname = NULL;
1476 struct nlattr *helpinfo = NULL;
1477 int err;
1478
1479 /* don't change helper of sibling connections */
1480 if (ct->master)
1481 return -EBUSY;
1482
1483 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1484 if (err < 0)
1485 return err;
1486
1487 if (!strcmp(helpname, "")) {
1488 if (help && help->helper) {
1489 /* we had a helper before ... */
1490 nf_ct_remove_expectations(ct);
1491 RCU_INIT_POINTER(help->helper, NULL);
1492 }
1493
1494 return 0;
1495 }
1496
1497 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1498 nf_ct_protonum(ct));
1499 if (helper == NULL) {
1500 #ifdef CONFIG_MODULES
1501 spin_unlock_bh(&nf_conntrack_expect_lock);
1502
1503 if (request_module("nfct-helper-%s", helpname) < 0) {
1504 spin_lock_bh(&nf_conntrack_expect_lock);
1505 return -EOPNOTSUPP;
1506 }
1507
1508 spin_lock_bh(&nf_conntrack_expect_lock);
1509 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1510 nf_ct_protonum(ct));
1511 if (helper)
1512 return -EAGAIN;
1513 #endif
1514 return -EOPNOTSUPP;
1515 }
1516
1517 if (help) {
1518 if (help->helper == helper) {
1519 /* update private helper data if allowed. */
1520 if (helper->from_nlattr)
1521 helper->from_nlattr(helpinfo, ct);
1522 return 0;
1523 } else
1524 return -EBUSY;
1525 }
1526
1527 /* we cannot set a helper for an existing conntrack */
1528 return -EOPNOTSUPP;
1529 }
1530
1531 static inline int
1532 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1533 {
1534 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1535
1536 if (!del_timer(&ct->timeout))
1537 return -ETIME;
1538
1539 ct->timeout.expires = jiffies + timeout * HZ;
1540 add_timer(&ct->timeout);
1541
1542 return 0;
1543 }
1544
1545 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1546 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1547 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1548 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1549 };
1550
1551 static inline int
1552 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1553 {
1554 const struct nlattr *attr = cda[CTA_PROTOINFO];
1555 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1556 struct nf_conntrack_l4proto *l4proto;
1557 int err = 0;
1558
1559 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1560 if (err < 0)
1561 return err;
1562
1563 rcu_read_lock();
1564 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1565 if (l4proto->from_nlattr)
1566 err = l4proto->from_nlattr(tb, ct);
1567 rcu_read_unlock();
1568
1569 return err;
1570 }
1571
1572 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1573 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1574 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1575 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1576 };
1577
1578 static inline int
1579 change_seq_adj(struct nf_ct_seqadj *seq, const struct nlattr * const attr)
1580 {
1581 int err;
1582 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1583
1584 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1585 if (err < 0)
1586 return err;
1587
1588 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1589 return -EINVAL;
1590
1591 seq->correction_pos =
1592 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1593
1594 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1595 return -EINVAL;
1596
1597 seq->offset_before =
1598 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1599
1600 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1601 return -EINVAL;
1602
1603 seq->offset_after =
1604 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1605
1606 return 0;
1607 }
1608
1609 static int
1610 ctnetlink_change_seq_adj(struct nf_conn *ct,
1611 const struct nlattr * const cda[])
1612 {
1613 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1614 int ret = 0;
1615
1616 if (!seqadj)
1617 return 0;
1618
1619 if (cda[CTA_SEQ_ADJ_ORIG]) {
1620 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1621 cda[CTA_SEQ_ADJ_ORIG]);
1622 if (ret < 0)
1623 return ret;
1624
1625 ct->status |= IPS_SEQ_ADJUST;
1626 }
1627
1628 if (cda[CTA_SEQ_ADJ_REPLY]) {
1629 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1630 cda[CTA_SEQ_ADJ_REPLY]);
1631 if (ret < 0)
1632 return ret;
1633
1634 ct->status |= IPS_SEQ_ADJUST;
1635 }
1636
1637 return 0;
1638 }
1639
1640 static int
1641 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1642 {
1643 #ifdef CONFIG_NF_CONNTRACK_LABELS
1644 size_t len = nla_len(cda[CTA_LABELS]);
1645 const void *mask = cda[CTA_LABELS_MASK];
1646
1647 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1648 return -EINVAL;
1649
1650 if (mask) {
1651 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1652 nla_len(cda[CTA_LABELS_MASK]) != len)
1653 return -EINVAL;
1654 mask = nla_data(cda[CTA_LABELS_MASK]);
1655 }
1656
1657 len /= sizeof(u32);
1658
1659 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1660 #else
1661 return -EOPNOTSUPP;
1662 #endif
1663 }
1664
1665 static int
1666 ctnetlink_change_conntrack(struct nf_conn *ct,
1667 const struct nlattr * const cda[])
1668 {
1669 int err;
1670
1671 /* only allow NAT changes and master assignation for new conntracks */
1672 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1673 return -EOPNOTSUPP;
1674
1675 if (cda[CTA_HELP]) {
1676 err = ctnetlink_change_helper(ct, cda);
1677 if (err < 0)
1678 return err;
1679 }
1680
1681 if (cda[CTA_TIMEOUT]) {
1682 err = ctnetlink_change_timeout(ct, cda);
1683 if (err < 0)
1684 return err;
1685 }
1686
1687 if (cda[CTA_STATUS]) {
1688 err = ctnetlink_change_status(ct, cda);
1689 if (err < 0)
1690 return err;
1691 }
1692
1693 if (cda[CTA_PROTOINFO]) {
1694 err = ctnetlink_change_protoinfo(ct, cda);
1695 if (err < 0)
1696 return err;
1697 }
1698
1699 #if defined(CONFIG_NF_CONNTRACK_MARK)
1700 if (cda[CTA_MARK])
1701 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1702 #endif
1703
1704 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1705 err = ctnetlink_change_seq_adj(ct, cda);
1706 if (err < 0)
1707 return err;
1708 }
1709
1710 if (cda[CTA_LABELS]) {
1711 err = ctnetlink_attach_labels(ct, cda);
1712 if (err < 0)
1713 return err;
1714 }
1715
1716 return 0;
1717 }
1718
1719 static struct nf_conn *
1720 ctnetlink_create_conntrack(struct net *net,
1721 const struct nf_conntrack_zone *zone,
1722 const struct nlattr * const cda[],
1723 struct nf_conntrack_tuple *otuple,
1724 struct nf_conntrack_tuple *rtuple,
1725 u8 u3)
1726 {
1727 struct nf_conn *ct;
1728 int err = -EINVAL;
1729 struct nf_conntrack_helper *helper;
1730 struct nf_conn_tstamp *tstamp;
1731
1732 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1733 if (IS_ERR(ct))
1734 return ERR_PTR(-ENOMEM);
1735
1736 if (!cda[CTA_TIMEOUT])
1737 goto err1;
1738 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1739
1740 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1741
1742 rcu_read_lock();
1743 if (cda[CTA_HELP]) {
1744 char *helpname = NULL;
1745 struct nlattr *helpinfo = NULL;
1746
1747 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1748 if (err < 0)
1749 goto err2;
1750
1751 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1752 nf_ct_protonum(ct));
1753 if (helper == NULL) {
1754 rcu_read_unlock();
1755 #ifdef CONFIG_MODULES
1756 if (request_module("nfct-helper-%s", helpname) < 0) {
1757 err = -EOPNOTSUPP;
1758 goto err1;
1759 }
1760
1761 rcu_read_lock();
1762 helper = __nf_conntrack_helper_find(helpname,
1763 nf_ct_l3num(ct),
1764 nf_ct_protonum(ct));
1765 if (helper) {
1766 err = -EAGAIN;
1767 goto err2;
1768 }
1769 rcu_read_unlock();
1770 #endif
1771 err = -EOPNOTSUPP;
1772 goto err1;
1773 } else {
1774 struct nf_conn_help *help;
1775
1776 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1777 if (help == NULL) {
1778 err = -ENOMEM;
1779 goto err2;
1780 }
1781 /* set private helper data if allowed. */
1782 if (helper->from_nlattr)
1783 helper->from_nlattr(helpinfo, ct);
1784
1785 /* not in hash table yet so not strictly necessary */
1786 RCU_INIT_POINTER(help->helper, helper);
1787 }
1788 } else {
1789 /* try an implicit helper assignation */
1790 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1791 if (err < 0)
1792 goto err2;
1793 }
1794
1795 err = ctnetlink_setup_nat(ct, cda);
1796 if (err < 0)
1797 goto err2;
1798
1799 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1800 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1801 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1802 nf_ct_labels_ext_add(ct);
1803
1804 /* we must add conntrack extensions before confirmation. */
1805 ct->status |= IPS_CONFIRMED;
1806
1807 if (cda[CTA_STATUS]) {
1808 err = ctnetlink_change_status(ct, cda);
1809 if (err < 0)
1810 goto err2;
1811 }
1812
1813 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1814 err = ctnetlink_change_seq_adj(ct, cda);
1815 if (err < 0)
1816 goto err2;
1817 }
1818
1819 memset(&ct->proto, 0, sizeof(ct->proto));
1820 if (cda[CTA_PROTOINFO]) {
1821 err = ctnetlink_change_protoinfo(ct, cda);
1822 if (err < 0)
1823 goto err2;
1824 }
1825
1826 #if defined(CONFIG_NF_CONNTRACK_MARK)
1827 if (cda[CTA_MARK])
1828 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1829 #endif
1830
1831 /* setup master conntrack: this is a confirmed expectation */
1832 if (cda[CTA_TUPLE_MASTER]) {
1833 struct nf_conntrack_tuple master;
1834 struct nf_conntrack_tuple_hash *master_h;
1835 struct nf_conn *master_ct;
1836
1837 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
1838 u3, NULL);
1839 if (err < 0)
1840 goto err2;
1841
1842 master_h = nf_conntrack_find_get(net, zone, &master);
1843 if (master_h == NULL) {
1844 err = -ENOENT;
1845 goto err2;
1846 }
1847 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1848 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1849 ct->master = master_ct;
1850 }
1851 tstamp = nf_conn_tstamp_find(ct);
1852 if (tstamp)
1853 tstamp->start = ktime_get_real_ns();
1854
1855 err = nf_conntrack_hash_check_insert(ct);
1856 if (err < 0)
1857 goto err2;
1858
1859 rcu_read_unlock();
1860
1861 return ct;
1862
1863 err2:
1864 rcu_read_unlock();
1865 err1:
1866 nf_conntrack_free(ct);
1867 return ERR_PTR(err);
1868 }
1869
1870 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
1871 struct sk_buff *skb,
1872 const struct nlmsghdr *nlh,
1873 const struct nlattr * const cda[])
1874 {
1875 struct nf_conntrack_tuple otuple, rtuple;
1876 struct nf_conntrack_tuple_hash *h = NULL;
1877 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1878 struct nf_conn *ct;
1879 u_int8_t u3 = nfmsg->nfgen_family;
1880 struct nf_conntrack_zone zone;
1881 int err;
1882
1883 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1884 if (err < 0)
1885 return err;
1886
1887 if (cda[CTA_TUPLE_ORIG]) {
1888 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
1889 u3, &zone);
1890 if (err < 0)
1891 return err;
1892 }
1893
1894 if (cda[CTA_TUPLE_REPLY]) {
1895 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
1896 u3, &zone);
1897 if (err < 0)
1898 return err;
1899 }
1900
1901 if (cda[CTA_TUPLE_ORIG])
1902 h = nf_conntrack_find_get(net, &zone, &otuple);
1903 else if (cda[CTA_TUPLE_REPLY])
1904 h = nf_conntrack_find_get(net, &zone, &rtuple);
1905
1906 if (h == NULL) {
1907 err = -ENOENT;
1908 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1909 enum ip_conntrack_events events;
1910
1911 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1912 return -EINVAL;
1913
1914 ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
1915 &rtuple, u3);
1916 if (IS_ERR(ct))
1917 return PTR_ERR(ct);
1918
1919 err = 0;
1920 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1921 events = IPCT_RELATED;
1922 else
1923 events = IPCT_NEW;
1924
1925 if (cda[CTA_LABELS] &&
1926 ctnetlink_attach_labels(ct, cda) == 0)
1927 events |= (1 << IPCT_LABEL);
1928
1929 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1930 (1 << IPCT_ASSURED) |
1931 (1 << IPCT_HELPER) |
1932 (1 << IPCT_PROTOINFO) |
1933 (1 << IPCT_SEQADJ) |
1934 (1 << IPCT_MARK) | events,
1935 ct, NETLINK_CB(skb).portid,
1936 nlmsg_report(nlh));
1937 nf_ct_put(ct);
1938 }
1939
1940 return err;
1941 }
1942 /* implicit 'else' */
1943
1944 err = -EEXIST;
1945 ct = nf_ct_tuplehash_to_ctrack(h);
1946 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1947 spin_lock_bh(&nf_conntrack_expect_lock);
1948 err = ctnetlink_change_conntrack(ct, cda);
1949 spin_unlock_bh(&nf_conntrack_expect_lock);
1950 if (err == 0) {
1951 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1952 (1 << IPCT_ASSURED) |
1953 (1 << IPCT_HELPER) |
1954 (1 << IPCT_LABEL) |
1955 (1 << IPCT_PROTOINFO) |
1956 (1 << IPCT_SEQADJ) |
1957 (1 << IPCT_MARK),
1958 ct, NETLINK_CB(skb).portid,
1959 nlmsg_report(nlh));
1960 }
1961 }
1962
1963 nf_ct_put(ct);
1964 return err;
1965 }
1966
1967 static int
1968 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1969 __u16 cpu, const struct ip_conntrack_stat *st)
1970 {
1971 struct nlmsghdr *nlh;
1972 struct nfgenmsg *nfmsg;
1973 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1974
1975 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1976 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1977 if (nlh == NULL)
1978 goto nlmsg_failure;
1979
1980 nfmsg = nlmsg_data(nlh);
1981 nfmsg->nfgen_family = AF_UNSPEC;
1982 nfmsg->version = NFNETLINK_V0;
1983 nfmsg->res_id = htons(cpu);
1984
1985 if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1986 nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1987 nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
1988 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1989 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1990 nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
1991 nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
1992 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1993 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1994 htonl(st->insert_failed)) ||
1995 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1996 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1997 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1998 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1999 htonl(st->search_restart)))
2000 goto nla_put_failure;
2001
2002 nlmsg_end(skb, nlh);
2003 return skb->len;
2004
2005 nla_put_failure:
2006 nlmsg_failure:
2007 nlmsg_cancel(skb, nlh);
2008 return -1;
2009 }
2010
2011 static int
2012 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2013 {
2014 int cpu;
2015 struct net *net = sock_net(skb->sk);
2016
2017 if (cb->args[0] == nr_cpu_ids)
2018 return 0;
2019
2020 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2021 const struct ip_conntrack_stat *st;
2022
2023 if (!cpu_possible(cpu))
2024 continue;
2025
2026 st = per_cpu_ptr(net->ct.stat, cpu);
2027 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2028 NETLINK_CB(cb->skb).portid,
2029 cb->nlh->nlmsg_seq,
2030 cpu, st) < 0)
2031 break;
2032 }
2033 cb->args[0] = cpu;
2034
2035 return skb->len;
2036 }
2037
2038 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2039 struct sk_buff *skb,
2040 const struct nlmsghdr *nlh,
2041 const struct nlattr * const cda[])
2042 {
2043 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2044 struct netlink_dump_control c = {
2045 .dump = ctnetlink_ct_stat_cpu_dump,
2046 };
2047 return netlink_dump_start(ctnl, skb, nlh, &c);
2048 }
2049
2050 return 0;
2051 }
2052
2053 static int
2054 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2055 struct net *net)
2056 {
2057 struct nlmsghdr *nlh;
2058 struct nfgenmsg *nfmsg;
2059 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2060 unsigned int nr_conntracks = atomic_read(&net->ct.count);
2061
2062 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
2063 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2064 if (nlh == NULL)
2065 goto nlmsg_failure;
2066
2067 nfmsg = nlmsg_data(nlh);
2068 nfmsg->nfgen_family = AF_UNSPEC;
2069 nfmsg->version = NFNETLINK_V0;
2070 nfmsg->res_id = 0;
2071
2072 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2073 goto nla_put_failure;
2074
2075 nlmsg_end(skb, nlh);
2076 return skb->len;
2077
2078 nla_put_failure:
2079 nlmsg_failure:
2080 nlmsg_cancel(skb, nlh);
2081 return -1;
2082 }
2083
2084 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2085 struct sk_buff *skb, const struct nlmsghdr *nlh,
2086 const struct nlattr * const cda[])
2087 {
2088 struct sk_buff *skb2;
2089 int err;
2090
2091 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2092 if (skb2 == NULL)
2093 return -ENOMEM;
2094
2095 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2096 nlh->nlmsg_seq,
2097 NFNL_MSG_TYPE(nlh->nlmsg_type),
2098 sock_net(skb->sk));
2099 if (err <= 0)
2100 goto free;
2101
2102 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2103 if (err < 0)
2104 goto out;
2105
2106 return 0;
2107
2108 free:
2109 kfree_skb(skb2);
2110 out:
2111 /* this avoids a loop in nfnetlink. */
2112 return err == -EAGAIN ? -ENOBUFS : err;
2113 }
2114
2115 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2116 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2117 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2118 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2119 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2120 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2121 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2122 .len = NF_CT_HELPER_NAME_LEN - 1 },
2123 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2124 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2125 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2126 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2127 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2128 };
2129
2130 static struct nf_conntrack_expect *
2131 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2132 struct nf_conntrack_helper *helper,
2133 struct nf_conntrack_tuple *tuple,
2134 struct nf_conntrack_tuple *mask);
2135
2136 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2137 static size_t
2138 ctnetlink_glue_build_size(const struct nf_conn *ct)
2139 {
2140 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2141 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2142 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2143 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2144 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2145 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2146 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2147 + nla_total_size(0) /* CTA_PROTOINFO */
2148 + nla_total_size(0) /* CTA_HELP */
2149 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2150 + ctnetlink_secctx_size(ct)
2151 #ifdef CONFIG_NF_NAT_NEEDED
2152 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2153 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2154 #endif
2155 #ifdef CONFIG_NF_CONNTRACK_MARK
2156 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2157 #endif
2158 #ifdef CONFIG_NF_CONNTRACK_ZONES
2159 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2160 #endif
2161 + ctnetlink_proto_size(ct)
2162 ;
2163 }
2164
2165 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2166 enum ip_conntrack_info *ctinfo)
2167 {
2168 struct nf_conn *ct;
2169
2170 ct = nf_ct_get(skb, ctinfo);
2171 if (ct && nf_ct_is_untracked(ct))
2172 ct = NULL;
2173
2174 return ct;
2175 }
2176
2177 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2178 {
2179 const struct nf_conntrack_zone *zone;
2180 struct nlattr *nest_parms;
2181
2182 rcu_read_lock();
2183 zone = nf_ct_zone(ct);
2184
2185 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2186 if (!nest_parms)
2187 goto nla_put_failure;
2188 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2189 goto nla_put_failure;
2190 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2191 NF_CT_ZONE_DIR_ORIG) < 0)
2192 goto nla_put_failure;
2193 nla_nest_end(skb, nest_parms);
2194
2195 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2196 if (!nest_parms)
2197 goto nla_put_failure;
2198 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2199 goto nla_put_failure;
2200 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2201 NF_CT_ZONE_DIR_REPL) < 0)
2202 goto nla_put_failure;
2203 nla_nest_end(skb, nest_parms);
2204
2205 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2206 NF_CT_DEFAULT_ZONE_DIR) < 0)
2207 goto nla_put_failure;
2208
2209 if (ctnetlink_dump_id(skb, ct) < 0)
2210 goto nla_put_failure;
2211
2212 if (ctnetlink_dump_status(skb, ct) < 0)
2213 goto nla_put_failure;
2214
2215 if (ctnetlink_dump_timeout(skb, ct) < 0)
2216 goto nla_put_failure;
2217
2218 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2219 goto nla_put_failure;
2220
2221 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2222 goto nla_put_failure;
2223
2224 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2225 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2226 goto nla_put_failure;
2227 #endif
2228 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2229 goto nla_put_failure;
2230
2231 if ((ct->status & IPS_SEQ_ADJUST) &&
2232 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2233 goto nla_put_failure;
2234
2235 #ifdef CONFIG_NF_CONNTRACK_MARK
2236 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2237 goto nla_put_failure;
2238 #endif
2239 if (ctnetlink_dump_labels(skb, ct) < 0)
2240 goto nla_put_failure;
2241 rcu_read_unlock();
2242 return 0;
2243
2244 nla_put_failure:
2245 rcu_read_unlock();
2246 return -ENOSPC;
2247 }
2248
2249 static int
2250 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2251 enum ip_conntrack_info ctinfo,
2252 u_int16_t ct_attr, u_int16_t ct_info_attr)
2253 {
2254 struct nlattr *nest_parms;
2255
2256 nest_parms = nla_nest_start(skb, ct_attr | NLA_F_NESTED);
2257 if (!nest_parms)
2258 goto nla_put_failure;
2259
2260 if (__ctnetlink_glue_build(skb, ct) < 0)
2261 goto nla_put_failure;
2262
2263 nla_nest_end(skb, nest_parms);
2264
2265 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2266 goto nla_put_failure;
2267
2268 return 0;
2269
2270 nla_put_failure:
2271 return -ENOSPC;
2272 }
2273
2274 static int
2275 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2276 {
2277 int err;
2278
2279 if (cda[CTA_TIMEOUT]) {
2280 err = ctnetlink_change_timeout(ct, cda);
2281 if (err < 0)
2282 return err;
2283 }
2284 if (cda[CTA_STATUS]) {
2285 err = ctnetlink_change_status(ct, cda);
2286 if (err < 0)
2287 return err;
2288 }
2289 if (cda[CTA_HELP]) {
2290 err = ctnetlink_change_helper(ct, cda);
2291 if (err < 0)
2292 return err;
2293 }
2294 if (cda[CTA_LABELS]) {
2295 err = ctnetlink_attach_labels(ct, cda);
2296 if (err < 0)
2297 return err;
2298 }
2299 #if defined(CONFIG_NF_CONNTRACK_MARK)
2300 if (cda[CTA_MARK]) {
2301 u32 mask = 0, mark, newmark;
2302 if (cda[CTA_MARK_MASK])
2303 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2304
2305 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2306 newmark = (ct->mark & mask) ^ mark;
2307 if (newmark != ct->mark)
2308 ct->mark = newmark;
2309 }
2310 #endif
2311 return 0;
2312 }
2313
2314 static int
2315 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2316 {
2317 struct nlattr *cda[CTA_MAX+1];
2318 int ret;
2319
2320 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2321 if (ret < 0)
2322 return ret;
2323
2324 spin_lock_bh(&nf_conntrack_expect_lock);
2325 ret = ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2326 spin_unlock_bh(&nf_conntrack_expect_lock);
2327
2328 return ret;
2329 }
2330
2331 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2332 const struct nf_conn *ct,
2333 struct nf_conntrack_tuple *tuple,
2334 struct nf_conntrack_tuple *mask)
2335 {
2336 int err;
2337
2338 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2339 nf_ct_l3num(ct), NULL);
2340 if (err < 0)
2341 return err;
2342
2343 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2344 nf_ct_l3num(ct), NULL);
2345 }
2346
2347 static int
2348 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2349 u32 portid, u32 report)
2350 {
2351 struct nlattr *cda[CTA_EXPECT_MAX+1];
2352 struct nf_conntrack_tuple tuple, mask;
2353 struct nf_conntrack_helper *helper = NULL;
2354 struct nf_conntrack_expect *exp;
2355 int err;
2356
2357 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2358 if (err < 0)
2359 return err;
2360
2361 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2362 ct, &tuple, &mask);
2363 if (err < 0)
2364 return err;
2365
2366 if (cda[CTA_EXPECT_HELP_NAME]) {
2367 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2368
2369 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2370 nf_ct_protonum(ct));
2371 if (helper == NULL)
2372 return -EOPNOTSUPP;
2373 }
2374
2375 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2376 helper, &tuple, &mask);
2377 if (IS_ERR(exp))
2378 return PTR_ERR(exp);
2379
2380 err = nf_ct_expect_related_report(exp, portid, report);
2381 if (err < 0) {
2382 nf_ct_expect_put(exp);
2383 return err;
2384 }
2385
2386 return 0;
2387 }
2388
2389 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2390 enum ip_conntrack_info ctinfo, int diff)
2391 {
2392 if (!(ct->status & IPS_NAT_MASK))
2393 return;
2394
2395 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2396 }
2397
2398 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2399 .get_ct = ctnetlink_glue_get_ct,
2400 .build_size = ctnetlink_glue_build_size,
2401 .build = ctnetlink_glue_build,
2402 .parse = ctnetlink_glue_parse,
2403 .attach_expect = ctnetlink_glue_attach_expect,
2404 .seq_adjust = ctnetlink_glue_seqadj,
2405 };
2406 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2407
2408 /***********************************************************************
2409 * EXPECT
2410 ***********************************************************************/
2411
2412 static inline int
2413 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2414 const struct nf_conntrack_tuple *tuple,
2415 enum ctattr_expect type)
2416 {
2417 struct nlattr *nest_parms;
2418
2419 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2420 if (!nest_parms)
2421 goto nla_put_failure;
2422 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2423 goto nla_put_failure;
2424 nla_nest_end(skb, nest_parms);
2425
2426 return 0;
2427
2428 nla_put_failure:
2429 return -1;
2430 }
2431
2432 static inline int
2433 ctnetlink_exp_dump_mask(struct sk_buff *skb,
2434 const struct nf_conntrack_tuple *tuple,
2435 const struct nf_conntrack_tuple_mask *mask)
2436 {
2437 int ret;
2438 struct nf_conntrack_l3proto *l3proto;
2439 struct nf_conntrack_l4proto *l4proto;
2440 struct nf_conntrack_tuple m;
2441 struct nlattr *nest_parms;
2442
2443 memset(&m, 0xFF, sizeof(m));
2444 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2445 m.src.u.all = mask->src.u.all;
2446 m.dst.protonum = tuple->dst.protonum;
2447
2448 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2449 if (!nest_parms)
2450 goto nla_put_failure;
2451
2452 rcu_read_lock();
2453 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2454 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2455 if (ret >= 0) {
2456 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2457 tuple->dst.protonum);
2458 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2459 }
2460 rcu_read_unlock();
2461
2462 if (unlikely(ret < 0))
2463 goto nla_put_failure;
2464
2465 nla_nest_end(skb, nest_parms);
2466
2467 return 0;
2468
2469 nla_put_failure:
2470 return -1;
2471 }
2472
2473 static const union nf_inet_addr any_addr;
2474
2475 static int
2476 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2477 const struct nf_conntrack_expect *exp)
2478 {
2479 struct nf_conn *master = exp->master;
2480 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2481 struct nf_conn_help *help;
2482 #ifdef CONFIG_NF_NAT_NEEDED
2483 struct nlattr *nest_parms;
2484 struct nf_conntrack_tuple nat_tuple = {};
2485 #endif
2486 struct nf_ct_helper_expectfn *expfn;
2487
2488 if (timeout < 0)
2489 timeout = 0;
2490
2491 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2492 goto nla_put_failure;
2493 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2494 goto nla_put_failure;
2495 if (ctnetlink_exp_dump_tuple(skb,
2496 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2497 CTA_EXPECT_MASTER) < 0)
2498 goto nla_put_failure;
2499
2500 #ifdef CONFIG_NF_NAT_NEEDED
2501 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2502 exp->saved_proto.all) {
2503 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2504 if (!nest_parms)
2505 goto nla_put_failure;
2506
2507 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2508 goto nla_put_failure;
2509
2510 nat_tuple.src.l3num = nf_ct_l3num(master);
2511 nat_tuple.src.u3 = exp->saved_addr;
2512 nat_tuple.dst.protonum = nf_ct_protonum(master);
2513 nat_tuple.src.u = exp->saved_proto;
2514
2515 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2516 CTA_EXPECT_NAT_TUPLE) < 0)
2517 goto nla_put_failure;
2518 nla_nest_end(skb, nest_parms);
2519 }
2520 #endif
2521 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2522 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2523 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2524 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2525 goto nla_put_failure;
2526 help = nfct_help(master);
2527 if (help) {
2528 struct nf_conntrack_helper *helper;
2529
2530 helper = rcu_dereference(help->helper);
2531 if (helper &&
2532 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2533 goto nla_put_failure;
2534 }
2535 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2536 if (expfn != NULL &&
2537 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2538 goto nla_put_failure;
2539
2540 return 0;
2541
2542 nla_put_failure:
2543 return -1;
2544 }
2545
2546 static int
2547 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2548 int event, const struct nf_conntrack_expect *exp)
2549 {
2550 struct nlmsghdr *nlh;
2551 struct nfgenmsg *nfmsg;
2552 unsigned int flags = portid ? NLM_F_MULTI : 0;
2553
2554 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2555 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2556 if (nlh == NULL)
2557 goto nlmsg_failure;
2558
2559 nfmsg = nlmsg_data(nlh);
2560 nfmsg->nfgen_family = exp->tuple.src.l3num;
2561 nfmsg->version = NFNETLINK_V0;
2562 nfmsg->res_id = 0;
2563
2564 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2565 goto nla_put_failure;
2566
2567 nlmsg_end(skb, nlh);
2568 return skb->len;
2569
2570 nlmsg_failure:
2571 nla_put_failure:
2572 nlmsg_cancel(skb, nlh);
2573 return -1;
2574 }
2575
2576 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2577 static int
2578 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2579 {
2580 struct nf_conntrack_expect *exp = item->exp;
2581 struct net *net = nf_ct_exp_net(exp);
2582 struct nlmsghdr *nlh;
2583 struct nfgenmsg *nfmsg;
2584 struct sk_buff *skb;
2585 unsigned int type, group;
2586 int flags = 0;
2587
2588 if (events & (1 << IPEXP_DESTROY)) {
2589 type = IPCTNL_MSG_EXP_DELETE;
2590 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2591 } else if (events & (1 << IPEXP_NEW)) {
2592 type = IPCTNL_MSG_EXP_NEW;
2593 flags = NLM_F_CREATE|NLM_F_EXCL;
2594 group = NFNLGRP_CONNTRACK_EXP_NEW;
2595 } else
2596 return 0;
2597
2598 if (!item->report && !nfnetlink_has_listeners(net, group))
2599 return 0;
2600
2601 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2602 if (skb == NULL)
2603 goto errout;
2604
2605 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2606 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2607 if (nlh == NULL)
2608 goto nlmsg_failure;
2609
2610 nfmsg = nlmsg_data(nlh);
2611 nfmsg->nfgen_family = exp->tuple.src.l3num;
2612 nfmsg->version = NFNETLINK_V0;
2613 nfmsg->res_id = 0;
2614
2615 rcu_read_lock();
2616 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2617 goto nla_put_failure;
2618 rcu_read_unlock();
2619
2620 nlmsg_end(skb, nlh);
2621 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2622 return 0;
2623
2624 nla_put_failure:
2625 rcu_read_unlock();
2626 nlmsg_cancel(skb, nlh);
2627 nlmsg_failure:
2628 kfree_skb(skb);
2629 errout:
2630 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2631 return 0;
2632 }
2633 #endif
2634 static int ctnetlink_exp_done(struct netlink_callback *cb)
2635 {
2636 if (cb->args[1])
2637 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2638 return 0;
2639 }
2640
2641 static int
2642 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2643 {
2644 struct net *net = sock_net(skb->sk);
2645 struct nf_conntrack_expect *exp, *last;
2646 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2647 u_int8_t l3proto = nfmsg->nfgen_family;
2648
2649 rcu_read_lock();
2650 last = (struct nf_conntrack_expect *)cb->args[1];
2651 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2652 restart:
2653 hlist_for_each_entry(exp, &net->ct.expect_hash[cb->args[0]],
2654 hnode) {
2655 if (l3proto && exp->tuple.src.l3num != l3proto)
2656 continue;
2657 if (cb->args[1]) {
2658 if (exp != last)
2659 continue;
2660 cb->args[1] = 0;
2661 }
2662 if (ctnetlink_exp_fill_info(skb,
2663 NETLINK_CB(cb->skb).portid,
2664 cb->nlh->nlmsg_seq,
2665 IPCTNL_MSG_EXP_NEW,
2666 exp) < 0) {
2667 if (!atomic_inc_not_zero(&exp->use))
2668 continue;
2669 cb->args[1] = (unsigned long)exp;
2670 goto out;
2671 }
2672 }
2673 if (cb->args[1]) {
2674 cb->args[1] = 0;
2675 goto restart;
2676 }
2677 }
2678 out:
2679 rcu_read_unlock();
2680 if (last)
2681 nf_ct_expect_put(last);
2682
2683 return skb->len;
2684 }
2685
2686 static int
2687 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2688 {
2689 struct nf_conntrack_expect *exp, *last;
2690 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2691 struct nf_conn *ct = cb->data;
2692 struct nf_conn_help *help = nfct_help(ct);
2693 u_int8_t l3proto = nfmsg->nfgen_family;
2694
2695 if (cb->args[0])
2696 return 0;
2697
2698 rcu_read_lock();
2699 last = (struct nf_conntrack_expect *)cb->args[1];
2700 restart:
2701 hlist_for_each_entry(exp, &help->expectations, lnode) {
2702 if (l3proto && exp->tuple.src.l3num != l3proto)
2703 continue;
2704 if (cb->args[1]) {
2705 if (exp != last)
2706 continue;
2707 cb->args[1] = 0;
2708 }
2709 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2710 cb->nlh->nlmsg_seq,
2711 IPCTNL_MSG_EXP_NEW,
2712 exp) < 0) {
2713 if (!atomic_inc_not_zero(&exp->use))
2714 continue;
2715 cb->args[1] = (unsigned long)exp;
2716 goto out;
2717 }
2718 }
2719 if (cb->args[1]) {
2720 cb->args[1] = 0;
2721 goto restart;
2722 }
2723 cb->args[0] = 1;
2724 out:
2725 rcu_read_unlock();
2726 if (last)
2727 nf_ct_expect_put(last);
2728
2729 return skb->len;
2730 }
2731
2732 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
2733 struct sk_buff *skb,
2734 const struct nlmsghdr *nlh,
2735 const struct nlattr * const cda[])
2736 {
2737 int err;
2738 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2739 u_int8_t u3 = nfmsg->nfgen_family;
2740 struct nf_conntrack_tuple tuple;
2741 struct nf_conntrack_tuple_hash *h;
2742 struct nf_conn *ct;
2743 struct nf_conntrack_zone zone;
2744 struct netlink_dump_control c = {
2745 .dump = ctnetlink_exp_ct_dump_table,
2746 .done = ctnetlink_exp_done,
2747 };
2748
2749 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2750 u3, NULL);
2751 if (err < 0)
2752 return err;
2753
2754 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2755 if (err < 0)
2756 return err;
2757
2758 h = nf_conntrack_find_get(net, &zone, &tuple);
2759 if (!h)
2760 return -ENOENT;
2761
2762 ct = nf_ct_tuplehash_to_ctrack(h);
2763 c.data = ct;
2764
2765 err = netlink_dump_start(ctnl, skb, nlh, &c);
2766 nf_ct_put(ct);
2767
2768 return err;
2769 }
2770
2771 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
2772 struct sk_buff *skb, const struct nlmsghdr *nlh,
2773 const struct nlattr * const cda[])
2774 {
2775 struct nf_conntrack_tuple tuple;
2776 struct nf_conntrack_expect *exp;
2777 struct sk_buff *skb2;
2778 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2779 u_int8_t u3 = nfmsg->nfgen_family;
2780 struct nf_conntrack_zone zone;
2781 int err;
2782
2783 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2784 if (cda[CTA_EXPECT_MASTER])
2785 return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda);
2786 else {
2787 struct netlink_dump_control c = {
2788 .dump = ctnetlink_exp_dump_table,
2789 .done = ctnetlink_exp_done,
2790 };
2791 return netlink_dump_start(ctnl, skb, nlh, &c);
2792 }
2793 }
2794
2795 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2796 if (err < 0)
2797 return err;
2798
2799 if (cda[CTA_EXPECT_TUPLE])
2800 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2801 u3, NULL);
2802 else if (cda[CTA_EXPECT_MASTER])
2803 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2804 u3, NULL);
2805 else
2806 return -EINVAL;
2807
2808 if (err < 0)
2809 return err;
2810
2811 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2812 if (!exp)
2813 return -ENOENT;
2814
2815 if (cda[CTA_EXPECT_ID]) {
2816 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2817 if (ntohl(id) != (u32)(unsigned long)exp) {
2818 nf_ct_expect_put(exp);
2819 return -ENOENT;
2820 }
2821 }
2822
2823 err = -ENOMEM;
2824 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2825 if (skb2 == NULL) {
2826 nf_ct_expect_put(exp);
2827 goto out;
2828 }
2829
2830 rcu_read_lock();
2831 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2832 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2833 rcu_read_unlock();
2834 nf_ct_expect_put(exp);
2835 if (err <= 0)
2836 goto free;
2837
2838 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2839 if (err < 0)
2840 goto out;
2841
2842 return 0;
2843
2844 free:
2845 kfree_skb(skb2);
2846 out:
2847 /* this avoids a loop in nfnetlink. */
2848 return err == -EAGAIN ? -ENOBUFS : err;
2849 }
2850
2851 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
2852 struct sk_buff *skb, const struct nlmsghdr *nlh,
2853 const struct nlattr * const cda[])
2854 {
2855 struct nf_conntrack_expect *exp;
2856 struct nf_conntrack_tuple tuple;
2857 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2858 struct hlist_node *next;
2859 u_int8_t u3 = nfmsg->nfgen_family;
2860 struct nf_conntrack_zone zone;
2861 unsigned int i;
2862 int err;
2863
2864 if (cda[CTA_EXPECT_TUPLE]) {
2865 /* delete a single expect by tuple */
2866 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2867 if (err < 0)
2868 return err;
2869
2870 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
2871 u3, NULL);
2872 if (err < 0)
2873 return err;
2874
2875 /* bump usage count to 2 */
2876 exp = nf_ct_expect_find_get(net, &zone, &tuple);
2877 if (!exp)
2878 return -ENOENT;
2879
2880 if (cda[CTA_EXPECT_ID]) {
2881 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2882 if (ntohl(id) != (u32)(unsigned long)exp) {
2883 nf_ct_expect_put(exp);
2884 return -ENOENT;
2885 }
2886 }
2887
2888 /* after list removal, usage count == 1 */
2889 spin_lock_bh(&nf_conntrack_expect_lock);
2890 if (del_timer(&exp->timeout)) {
2891 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2892 nlmsg_report(nlh));
2893 nf_ct_expect_put(exp);
2894 }
2895 spin_unlock_bh(&nf_conntrack_expect_lock);
2896 /* have to put what we 'get' above.
2897 * after this line usage count == 0 */
2898 nf_ct_expect_put(exp);
2899 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2900 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2901 struct nf_conn_help *m_help;
2902
2903 /* delete all expectations for this helper */
2904 spin_lock_bh(&nf_conntrack_expect_lock);
2905 for (i = 0; i < nf_ct_expect_hsize; i++) {
2906 hlist_for_each_entry_safe(exp, next,
2907 &net->ct.expect_hash[i],
2908 hnode) {
2909 m_help = nfct_help(exp->master);
2910 if (!strcmp(m_help->helper->name, name) &&
2911 del_timer(&exp->timeout)) {
2912 nf_ct_unlink_expect_report(exp,
2913 NETLINK_CB(skb).portid,
2914 nlmsg_report(nlh));
2915 nf_ct_expect_put(exp);
2916 }
2917 }
2918 }
2919 spin_unlock_bh(&nf_conntrack_expect_lock);
2920 } else {
2921 /* This basically means we have to flush everything*/
2922 spin_lock_bh(&nf_conntrack_expect_lock);
2923 for (i = 0; i < nf_ct_expect_hsize; i++) {
2924 hlist_for_each_entry_safe(exp, next,
2925 &net->ct.expect_hash[i],
2926 hnode) {
2927 if (del_timer(&exp->timeout)) {
2928 nf_ct_unlink_expect_report(exp,
2929 NETLINK_CB(skb).portid,
2930 nlmsg_report(nlh));
2931 nf_ct_expect_put(exp);
2932 }
2933 }
2934 }
2935 spin_unlock_bh(&nf_conntrack_expect_lock);
2936 }
2937
2938 return 0;
2939 }
2940 static int
2941 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2942 const struct nlattr * const cda[])
2943 {
2944 if (cda[CTA_EXPECT_TIMEOUT]) {
2945 if (!del_timer(&x->timeout))
2946 return -ETIME;
2947
2948 x->timeout.expires = jiffies +
2949 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2950 add_timer(&x->timeout);
2951 }
2952 return 0;
2953 }
2954
2955 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2956 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2957 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2958 };
2959
2960 static int
2961 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2962 struct nf_conntrack_expect *exp,
2963 u_int8_t u3)
2964 {
2965 #ifdef CONFIG_NF_NAT_NEEDED
2966 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2967 struct nf_conntrack_tuple nat_tuple = {};
2968 int err;
2969
2970 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2971 if (err < 0)
2972 return err;
2973
2974 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2975 return -EINVAL;
2976
2977 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2978 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
2979 u3, NULL);
2980 if (err < 0)
2981 return err;
2982
2983 exp->saved_addr = nat_tuple.src.u3;
2984 exp->saved_proto = nat_tuple.src.u;
2985 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2986
2987 return 0;
2988 #else
2989 return -EOPNOTSUPP;
2990 #endif
2991 }
2992
2993 static struct nf_conntrack_expect *
2994 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
2995 struct nf_conntrack_helper *helper,
2996 struct nf_conntrack_tuple *tuple,
2997 struct nf_conntrack_tuple *mask)
2998 {
2999 u_int32_t class = 0;
3000 struct nf_conntrack_expect *exp;
3001 struct nf_conn_help *help;
3002 int err;
3003
3004 if (cda[CTA_EXPECT_CLASS] && helper) {
3005 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3006 if (class > helper->expect_class_max)
3007 return ERR_PTR(-EINVAL);
3008 }
3009 exp = nf_ct_expect_alloc(ct);
3010 if (!exp)
3011 return ERR_PTR(-ENOMEM);
3012
3013 help = nfct_help(ct);
3014 if (!help) {
3015 if (!cda[CTA_EXPECT_TIMEOUT]) {
3016 err = -EINVAL;
3017 goto err_out;
3018 }
3019 exp->timeout.expires =
3020 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3021
3022 exp->flags = NF_CT_EXPECT_USERSPACE;
3023 if (cda[CTA_EXPECT_FLAGS]) {
3024 exp->flags |=
3025 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3026 }
3027 } else {
3028 if (cda[CTA_EXPECT_FLAGS]) {
3029 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3030 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3031 } else
3032 exp->flags = 0;
3033 }
3034 if (cda[CTA_EXPECT_FN]) {
3035 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3036 struct nf_ct_helper_expectfn *expfn;
3037
3038 expfn = nf_ct_helper_expectfn_find_by_name(name);
3039 if (expfn == NULL) {
3040 err = -EINVAL;
3041 goto err_out;
3042 }
3043 exp->expectfn = expfn->expectfn;
3044 } else
3045 exp->expectfn = NULL;
3046
3047 exp->class = class;
3048 exp->master = ct;
3049 exp->helper = helper;
3050 exp->tuple = *tuple;
3051 exp->mask.src.u3 = mask->src.u3;
3052 exp->mask.src.u.all = mask->src.u.all;
3053
3054 if (cda[CTA_EXPECT_NAT]) {
3055 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3056 exp, nf_ct_l3num(ct));
3057 if (err < 0)
3058 goto err_out;
3059 }
3060 return exp;
3061 err_out:
3062 nf_ct_expect_put(exp);
3063 return ERR_PTR(err);
3064 }
3065
3066 static int
3067 ctnetlink_create_expect(struct net *net,
3068 const struct nf_conntrack_zone *zone,
3069 const struct nlattr * const cda[],
3070 u_int8_t u3, u32 portid, int report)
3071 {
3072 struct nf_conntrack_tuple tuple, mask, master_tuple;
3073 struct nf_conntrack_tuple_hash *h = NULL;
3074 struct nf_conntrack_helper *helper = NULL;
3075 struct nf_conntrack_expect *exp;
3076 struct nf_conn *ct;
3077 int err;
3078
3079 /* caller guarantees that those three CTA_EXPECT_* exist */
3080 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3081 u3, NULL);
3082 if (err < 0)
3083 return err;
3084 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3085 u3, NULL);
3086 if (err < 0)
3087 return err;
3088 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3089 u3, NULL);
3090 if (err < 0)
3091 return err;
3092
3093 /* Look for master conntrack of this expectation */
3094 h = nf_conntrack_find_get(net, zone, &master_tuple);
3095 if (!h)
3096 return -ENOENT;
3097 ct = nf_ct_tuplehash_to_ctrack(h);
3098
3099 if (cda[CTA_EXPECT_HELP_NAME]) {
3100 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3101
3102 helper = __nf_conntrack_helper_find(helpname, u3,
3103 nf_ct_protonum(ct));
3104 if (helper == NULL) {
3105 #ifdef CONFIG_MODULES
3106 if (request_module("nfct-helper-%s", helpname) < 0) {
3107 err = -EOPNOTSUPP;
3108 goto err_ct;
3109 }
3110 helper = __nf_conntrack_helper_find(helpname, u3,
3111 nf_ct_protonum(ct));
3112 if (helper) {
3113 err = -EAGAIN;
3114 goto err_ct;
3115 }
3116 #endif
3117 err = -EOPNOTSUPP;
3118 goto err_ct;
3119 }
3120 }
3121
3122 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3123 if (IS_ERR(exp)) {
3124 err = PTR_ERR(exp);
3125 goto err_ct;
3126 }
3127
3128 err = nf_ct_expect_related_report(exp, portid, report);
3129 nf_ct_expect_put(exp);
3130 err_ct:
3131 nf_ct_put(ct);
3132 return err;
3133 }
3134
3135 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3136 struct sk_buff *skb, const struct nlmsghdr *nlh,
3137 const struct nlattr * const cda[])
3138 {
3139 struct nf_conntrack_tuple tuple;
3140 struct nf_conntrack_expect *exp;
3141 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3142 u_int8_t u3 = nfmsg->nfgen_family;
3143 struct nf_conntrack_zone zone;
3144 int err;
3145
3146 if (!cda[CTA_EXPECT_TUPLE]
3147 || !cda[CTA_EXPECT_MASK]
3148 || !cda[CTA_EXPECT_MASTER])
3149 return -EINVAL;
3150
3151 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3152 if (err < 0)
3153 return err;
3154
3155 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3156 u3, NULL);
3157 if (err < 0)
3158 return err;
3159
3160 spin_lock_bh(&nf_conntrack_expect_lock);
3161 exp = __nf_ct_expect_find(net, &zone, &tuple);
3162 if (!exp) {
3163 spin_unlock_bh(&nf_conntrack_expect_lock);
3164 err = -ENOENT;
3165 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3166 err = ctnetlink_create_expect(net, &zone, cda, u3,
3167 NETLINK_CB(skb).portid,
3168 nlmsg_report(nlh));
3169 }
3170 return err;
3171 }
3172
3173 err = -EEXIST;
3174 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3175 err = ctnetlink_change_expect(exp, cda);
3176 spin_unlock_bh(&nf_conntrack_expect_lock);
3177
3178 return err;
3179 }
3180
3181 static int
3182 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3183 const struct ip_conntrack_stat *st)
3184 {
3185 struct nlmsghdr *nlh;
3186 struct nfgenmsg *nfmsg;
3187 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3188
3189 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
3190 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3191 if (nlh == NULL)
3192 goto nlmsg_failure;
3193
3194 nfmsg = nlmsg_data(nlh);
3195 nfmsg->nfgen_family = AF_UNSPEC;
3196 nfmsg->version = NFNETLINK_V0;
3197 nfmsg->res_id = htons(cpu);
3198
3199 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3200 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3201 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3202 goto nla_put_failure;
3203
3204 nlmsg_end(skb, nlh);
3205 return skb->len;
3206
3207 nla_put_failure:
3208 nlmsg_failure:
3209 nlmsg_cancel(skb, nlh);
3210 return -1;
3211 }
3212
3213 static int
3214 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3215 {
3216 int cpu;
3217 struct net *net = sock_net(skb->sk);
3218
3219 if (cb->args[0] == nr_cpu_ids)
3220 return 0;
3221
3222 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3223 const struct ip_conntrack_stat *st;
3224
3225 if (!cpu_possible(cpu))
3226 continue;
3227
3228 st = per_cpu_ptr(net->ct.stat, cpu);
3229 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3230 cb->nlh->nlmsg_seq,
3231 cpu, st) < 0)
3232 break;
3233 }
3234 cb->args[0] = cpu;
3235
3236 return skb->len;
3237 }
3238
3239 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3240 struct sk_buff *skb,
3241 const struct nlmsghdr *nlh,
3242 const struct nlattr * const cda[])
3243 {
3244 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3245 struct netlink_dump_control c = {
3246 .dump = ctnetlink_exp_stat_cpu_dump,
3247 };
3248 return netlink_dump_start(ctnl, skb, nlh, &c);
3249 }
3250
3251 return 0;
3252 }
3253
3254 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3255 static struct nf_ct_event_notifier ctnl_notifier = {
3256 .fcn = ctnetlink_conntrack_event,
3257 };
3258
3259 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3260 .fcn = ctnetlink_expect_event,
3261 };
3262 #endif
3263
3264 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3265 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3266 .attr_count = CTA_MAX,
3267 .policy = ct_nla_policy },
3268 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3269 .attr_count = CTA_MAX,
3270 .policy = ct_nla_policy },
3271 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3272 .attr_count = CTA_MAX,
3273 .policy = ct_nla_policy },
3274 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3275 .attr_count = CTA_MAX,
3276 .policy = ct_nla_policy },
3277 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3278 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3279 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3280 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3281 };
3282
3283 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3284 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3285 .attr_count = CTA_EXPECT_MAX,
3286 .policy = exp_nla_policy },
3287 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3288 .attr_count = CTA_EXPECT_MAX,
3289 .policy = exp_nla_policy },
3290 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3291 .attr_count = CTA_EXPECT_MAX,
3292 .policy = exp_nla_policy },
3293 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3294 };
3295
3296 static const struct nfnetlink_subsystem ctnl_subsys = {
3297 .name = "conntrack",
3298 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3299 .cb_count = IPCTNL_MSG_MAX,
3300 .cb = ctnl_cb,
3301 };
3302
3303 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3304 .name = "conntrack_expect",
3305 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3306 .cb_count = IPCTNL_MSG_EXP_MAX,
3307 .cb = ctnl_exp_cb,
3308 };
3309
3310 MODULE_ALIAS("ip_conntrack_netlink");
3311 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3312 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3313
3314 static int __net_init ctnetlink_net_init(struct net *net)
3315 {
3316 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3317 int ret;
3318
3319 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3320 if (ret < 0) {
3321 pr_err("ctnetlink_init: cannot register notifier.\n");
3322 goto err_out;
3323 }
3324
3325 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3326 if (ret < 0) {
3327 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3328 goto err_unreg_notifier;
3329 }
3330 #endif
3331 return 0;
3332
3333 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3334 err_unreg_notifier:
3335 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3336 err_out:
3337 return ret;
3338 #endif
3339 }
3340
3341 static void ctnetlink_net_exit(struct net *net)
3342 {
3343 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3344 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3345 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3346 #endif
3347 }
3348
3349 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3350 {
3351 struct net *net;
3352
3353 list_for_each_entry(net, net_exit_list, exit_list)
3354 ctnetlink_net_exit(net);
3355 }
3356
3357 static struct pernet_operations ctnetlink_net_ops = {
3358 .init = ctnetlink_net_init,
3359 .exit_batch = ctnetlink_net_exit_batch,
3360 };
3361
3362 static int __init ctnetlink_init(void)
3363 {
3364 int ret;
3365
3366 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3367 ret = nfnetlink_subsys_register(&ctnl_subsys);
3368 if (ret < 0) {
3369 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3370 goto err_out;
3371 }
3372
3373 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3374 if (ret < 0) {
3375 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3376 goto err_unreg_subsys;
3377 }
3378
3379 ret = register_pernet_subsys(&ctnetlink_net_ops);
3380 if (ret < 0) {
3381 pr_err("ctnetlink_init: cannot register pernet operations\n");
3382 goto err_unreg_exp_subsys;
3383 }
3384 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3385 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3386 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3387 #endif
3388 return 0;
3389
3390 err_unreg_exp_subsys:
3391 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3392 err_unreg_subsys:
3393 nfnetlink_subsys_unregister(&ctnl_subsys);
3394 err_out:
3395 return ret;
3396 }
3397
3398 static void __exit ctnetlink_exit(void)
3399 {
3400 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3401
3402 unregister_pernet_subsys(&ctnetlink_net_ops);
3403 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3404 nfnetlink_subsys_unregister(&ctnl_subsys);
3405 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3406 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3407 #endif
3408 }
3409
3410 module_init(ctnetlink_init);
3411 module_exit(ctnetlink_exit);
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