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[NET]: Add documentation for TFRC structures
[deliverable/linux.git] / net / netfilter / nf_conntrack_netlink.c
CommitLineData
c1d10adb
PNA		 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>
dc808fe2 5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
c1d10adb 6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
1cde6436 7 * (C) 2005-2006 by Pablo Neira Ayuso <pablo@eurodev.net>
c1d10adb
PNA		 8 *
9 * I've reworked this stuff to use attributes instead of conntrack
10 * structures. 5.44 am. I need more tea. --pablo 05/07/11.
11 *
12 * Initial connection tracking via netlink development funded and
13 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
14 *
15 * Further development of this code funded by Astaro AG (http://www.astaro.com)
16 *
17 * This software may be used and distributed according to the terms
18 * of the GNU General Public License, incorporated herein by reference.
19 *
20 * Derived from ip_conntrack_netlink.c: Port by Pablo Neira Ayuso (05/11/14)
21 */
22
23#include <linux/init.h>
24#include <linux/module.h>
25#include <linux/kernel.h>
26#include <linux/types.h>
27#include <linux/timer.h>
28#include <linux/skbuff.h>
29#include <linux/errno.h>
30#include <linux/netlink.h>
31#include <linux/spinlock.h>
40a839fd 32#include <linux/interrupt.h>
c1d10adb
PNA		 33#include <linux/notifier.h>
34
35#include <linux/netfilter.h>
36#include <net/netfilter/nf_conntrack.h>
37#include <net/netfilter/nf_conntrack_core.h>
38#include <net/netfilter/nf_conntrack_helper.h>
39#include <net/netfilter/nf_conntrack_l3proto.h>
40#include <net/netfilter/nf_conntrack_protocol.h>
41#include <linux/netfilter_ipv4/ip_nat_protocol.h>
42
43#include <linux/netfilter/nfnetlink.h>
44#include <linux/netfilter/nfnetlink_conntrack.h>
45
46MODULE_LICENSE("GPL");
47
dc808fe2 48static char __initdata version[] = "0.93";
c1d10adb 49
c1d10adb
PNA		 50static inline int
51ctnetlink_dump_tuples_proto(struct sk_buff *skb,
1cde6436
PNA		 52 const struct nf_conntrack_tuple *tuple,
53 struct nf_conntrack_protocol *proto)
c1d10adb 54{
c1d10adb 55 int ret = 0;
1cde6436 56 struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
c1d10adb
PNA		 57
58 NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
59
c1d10adb
PNA		 60 if (likely(proto->tuple_to_nfattr))
61 ret = proto->tuple_to_nfattr(skb, tuple);
62
1cde6436 63 NFA_NEST_END(skb, nest_parms);
c1d10adb
PNA		 64
65 return ret;
66
67nfattr_failure:
68 return -1;
69}
70
71static inline int
1cde6436
PNA		 72ctnetlink_dump_tuples_ip(struct sk_buff *skb,
73 const struct nf_conntrack_tuple *tuple,
74 struct nf_conntrack_l3proto *l3proto)
c1d10adb 75{
c1d10adb 76 int ret = 0;
1cde6436
PNA		 77 struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
78
c1d10adb
PNA		 79 if (likely(l3proto->tuple_to_nfattr))
80 ret = l3proto->tuple_to_nfattr(skb, tuple);
1cde6436 81
c1d10adb
PNA		 82 NFA_NEST_END(skb, nest_parms);
83
1cde6436
PNA		 84 return ret;
85
86nfattr_failure:
87 return -1;
88}
89
90static inline int
91ctnetlink_dump_tuples(struct sk_buff *skb,
92 const struct nf_conntrack_tuple *tuple)
93{
94 int ret;
95 struct nf_conntrack_l3proto *l3proto;
96 struct nf_conntrack_protocol *proto;
97
98 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
99 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
c1d10adb
PNA		 100 nf_ct_l3proto_put(l3proto);
101
102 if (unlikely(ret < 0))
103 return ret;
104
1cde6436
PNA		 105 proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
106 ret = ctnetlink_dump_tuples_proto(skb, tuple, proto);
107 nf_ct_proto_put(proto);
c1d10adb
PNA		 108
109 return ret;
c1d10adb
PNA		 110}
111
112static inline int
113ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
114{
115 u_int32_t status = htonl((u_int32_t) ct->status);
116 NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
117 return 0;
118
119nfattr_failure:
120 return -1;
121}
122
123static inline int
124ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
125{
126 long timeout_l = ct->timeout.expires - jiffies;
127 u_int32_t timeout;
128
129 if (timeout_l < 0)
130 timeout = 0;
131 else
132 timeout = htonl(timeout_l / HZ);
133
134 NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
135 return 0;
136
137nfattr_failure:
138 return -1;
139}
140
141static inline int
142ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
143{
144 struct nf_conntrack_protocol *proto = nf_ct_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
145 struct nfattr *nest_proto;
146 int ret;
147
148 if (!proto->to_nfattr) {
149 nf_ct_proto_put(proto);
150 return 0;
151 }
152
153 nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
154
155 ret = proto->to_nfattr(skb, nest_proto, ct);
156
157 nf_ct_proto_put(proto);
158
159 NFA_NEST_END(skb, nest_proto);
160
161 return ret;
162
163nfattr_failure:
c537b75a 164 nf_ct_proto_put(proto);
c1d10adb
PNA		 165 return -1;
166}
167
168static inline int
169ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
170{
171 struct nfattr *nest_helper;
dc808fe2 172 const struct nf_conn_help *help = nfct_help(ct);
c1d10adb 173
dc808fe2 174 if (!help || !help->helper)
c1d10adb
PNA		 175 return 0;
176
177 nest_helper = NFA_NEST(skb, CTA_HELP);
dc808fe2 178 NFA_PUT(skb, CTA_HELP_NAME, strlen(help->helper->name), help->helper->name);
c1d10adb 179
dc808fe2
HW		 180 if (help->helper->to_nfattr)
181 help->helper->to_nfattr(skb, ct);
c1d10adb
PNA		 182
183 NFA_NEST_END(skb, nest_helper);
184
185 return 0;
186
187nfattr_failure:
188 return -1;
189}
190
191#ifdef CONFIG_NF_CT_ACCT
192static inline int
193ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
194 enum ip_conntrack_dir dir)
195{
196 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
197 struct nfattr *nest_count = NFA_NEST(skb, type);
198 u_int32_t tmp;
199
200 tmp = htonl(ct->counters[dir].packets);
201 NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
202
203 tmp = htonl(ct->counters[dir].bytes);
204 NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
205
206 NFA_NEST_END(skb, nest_count);
207
208 return 0;
209
210nfattr_failure:
211 return -1;
212}
213#else
214#define ctnetlink_dump_counters(a, b, c) (0)
215#endif
216
217#ifdef CONFIG_NF_CONNTRACK_MARK
218static inline int
219ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
220{
221 u_int32_t mark = htonl(ct->mark);
222
223 NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
224 return 0;
225
226nfattr_failure:
227 return -1;
228}
229#else
230#define ctnetlink_dump_mark(a, b) (0)
231#endif
232
233static inline int
234ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
235{
236 u_int32_t id = htonl(ct->id);
237 NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
238 return 0;
239
240nfattr_failure:
241 return -1;
242}
243
244static inline int
245ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
246{
247 u_int32_t use = htonl(atomic_read(&ct->ct_general.use));
248
249 NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
250 return 0;
251
252nfattr_failure:
253 return -1;
254}
255
256#define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
257
258static int
259ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
260 int event, int nowait,
261 const struct nf_conn *ct)
262{
263 struct nlmsghdr *nlh;
264 struct nfgenmsg *nfmsg;
265 struct nfattr *nest_parms;
266 unsigned char *b;
267
268 b = skb->tail;
269
270 event |= NFNL_SUBSYS_CTNETLINK << 8;
271 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
272 nfmsg = NLMSG_DATA(nlh);
273
274 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
275 nfmsg->nfgen_family =
276 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
277 nfmsg->version = NFNETLINK_V0;
278 nfmsg->res_id = 0;
279
280 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
281 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
282 goto nfattr_failure;
283 NFA_NEST_END(skb, nest_parms);
284
285 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
286 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
287 goto nfattr_failure;
288 NFA_NEST_END(skb, nest_parms);
289
290 if (ctnetlink_dump_status(skb, ct) < 0 ||
291 ctnetlink_dump_timeout(skb, ct) < 0 ||
292 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
293 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
294 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
295 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
296 ctnetlink_dump_mark(skb, ct) < 0 ||
297 ctnetlink_dump_id(skb, ct) < 0 ||
298 ctnetlink_dump_use(skb, ct) < 0)
299 goto nfattr_failure;
300
301 nlh->nlmsg_len = skb->tail - b;
302 return skb->len;
303
304nlmsg_failure:
305nfattr_failure:
306 skb_trim(skb, b - skb->data);
307 return -1;
308}
309
310#ifdef CONFIG_NF_CONNTRACK_EVENTS
311static int ctnetlink_conntrack_event(struct notifier_block *this,
312 unsigned long events, void *ptr)
313{
314 struct nlmsghdr *nlh;
315 struct nfgenmsg *nfmsg;
316 struct nfattr *nest_parms;
317 struct nf_conn *ct = (struct nf_conn *)ptr;
318 struct sk_buff *skb;
319 unsigned int type;
320 unsigned char *b;
321 unsigned int flags = 0, group;
322
323 /* ignore our fake conntrack entry */
324 if (ct == &nf_conntrack_untracked)
325 return NOTIFY_DONE;
326
327 if (events & IPCT_DESTROY) {
328 type = IPCTNL_MSG_CT_DELETE;
329 group = NFNLGRP_CONNTRACK_DESTROY;
330 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
331 type = IPCTNL_MSG_CT_NEW;
332 flags = NLM_F_CREATE|NLM_F_EXCL;
333 /* dump everything */
334 events = ~0UL;
335 group = NFNLGRP_CONNTRACK_NEW;
1a31526b 336 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
c1d10adb
PNA		 337 type = IPCTNL_MSG_CT_NEW;
338 group = NFNLGRP_CONNTRACK_UPDATE;
339 } else
340 return NOTIFY_DONE;
a2427692
PM		 341
342 if (!nfnetlink_has_listeners(group))
343 return NOTIFY_DONE;
344
c1d10adb
PNA		 345 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
346 if (!skb)
347 return NOTIFY_DONE;
348
349 b = skb->tail;
350
351 type |= NFNL_SUBSYS_CTNETLINK << 8;
352 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
353 nfmsg = NLMSG_DATA(nlh);
354
355 nlh->nlmsg_flags = flags;
356 nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
357 nfmsg->version = NFNETLINK_V0;
358 nfmsg->res_id = 0;
359
360 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
361 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
362 goto nfattr_failure;
363 NFA_NEST_END(skb, nest_parms);
364
365 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
366 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
367 goto nfattr_failure;
368 NFA_NEST_END(skb, nest_parms);
369
370 /* NAT stuff is now a status flag */
371 if ((events & IPCT_STATUS || events & IPCT_NATINFO)
372 && ctnetlink_dump_status(skb, ct) < 0)
373 goto nfattr_failure;
374 if (events & IPCT_REFRESH
375 && ctnetlink_dump_timeout(skb, ct) < 0)
376 goto nfattr_failure;
377 if (events & IPCT_PROTOINFO
378 && ctnetlink_dump_protoinfo(skb, ct) < 0)
379 goto nfattr_failure;
380 if (events & IPCT_HELPINFO
381 && ctnetlink_dump_helpinfo(skb, ct) < 0)
382 goto nfattr_failure;
383
384 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
385 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
386 goto nfattr_failure;
387
b9a37e0c
PNA		 388 if (events & IPCT_MARK
389 && ctnetlink_dump_mark(skb, ct) < 0)
390 goto nfattr_failure;
391
c1d10adb
PNA		 392 nlh->nlmsg_len = skb->tail - b;
393 nfnetlink_send(skb, 0, group, 0);
394 return NOTIFY_DONE;
395
396nlmsg_failure:
397nfattr_failure:
398 kfree_skb(skb);
399 return NOTIFY_DONE;
400}
401#endif /* CONFIG_NF_CONNTRACK_EVENTS */
402
403static int ctnetlink_done(struct netlink_callback *cb)
404{
89f2e218
PM		 405 if (cb->args[1])
406 nf_ct_put((struct nf_conn *)cb->args[1]);
c1d10adb
PNA		 407 return 0;
408}
409
87711cb8
PNA		 410#define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
411
c1d10adb
PNA		 412static int
413ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
414{
89f2e218 415 struct nf_conn *ct, *last;
c1d10adb
PNA		 416 struct nf_conntrack_tuple_hash *h;
417 struct list_head *i;
87711cb8
PNA		 418 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
419 u_int8_t l3proto = nfmsg->nfgen_family;
c1d10adb 420
c1d10adb 421 read_lock_bh(&nf_conntrack_lock);
d205dc40 422 last = (struct nf_conn *)cb->args[1];
89f2e218
PM		 423 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
424restart:
c1d10adb
PNA		 425 list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
426 h = (struct nf_conntrack_tuple_hash *) i;
427 if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
428 continue;
429 ct = nf_ct_tuplehash_to_ctrack(h);
87711cb8
PNA		 430 /* Dump entries of a given L3 protocol number.
431 * If it is not specified, ie. l3proto == 0,
432 * then dump everything. */
433 if (l3proto && L3PROTO(ct) != l3proto)
434 continue;
d205dc40
PM		 435 if (cb->args[1]) {
436 if (ct != last)
89f2e218 437 continue;
d205dc40 438 cb->args[1] = 0;
89f2e218 439 }
c1d10adb
PNA		 440 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
441 cb->nlh->nlmsg_seq,
442 IPCTNL_MSG_CT_NEW,
89f2e218
PM		 443 1, ct) < 0) {
444 nf_conntrack_get(&ct->ct_general);
445 cb->args[1] = (unsigned long)ct;
c1d10adb 446 goto out;
89f2e218 447 }
01f34848
PNA		 448#ifdef CONFIG_NF_CT_ACCT
449 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
450 IPCTNL_MSG_CT_GET_CTRZERO)
451 memset(&ct->counters, 0, sizeof(ct->counters));
452#endif
89f2e218 453 }
d205dc40 454 if (cb->args[1]) {
89f2e218
PM		 455 cb->args[1] = 0;
456 goto restart;
c1d10adb
PNA		 457 }
458 }
89f2e218 459out:
c1d10adb 460 read_unlock_bh(&nf_conntrack_lock);
d205dc40
PM		 461 if (last)
462 nf_ct_put(last);
c1d10adb 463
c1d10adb
PNA		 464 return skb->len;
465}
466
c1d10adb
PNA		 467static inline int
468ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple)
469{
470 struct nfattr *tb[CTA_IP_MAX];
471 struct nf_conntrack_l3proto *l3proto;
472 int ret = 0;
473
c1d10adb
PNA		 474 nfattr_parse_nested(tb, CTA_IP_MAX, attr);
475
476 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
477
478 if (likely(l3proto->nfattr_to_tuple))
479 ret = l3proto->nfattr_to_tuple(tb, tuple);
480
481 nf_ct_l3proto_put(l3proto);
482
c1d10adb
PNA		 483 return ret;
484}
485
486static const size_t cta_min_proto[CTA_PROTO_MAX] = {
487 [CTA_PROTO_NUM-1] = sizeof(u_int8_t),
488};
489
490static inline int
491ctnetlink_parse_tuple_proto(struct nfattr *attr,
492 struct nf_conntrack_tuple *tuple)
493{
494 struct nfattr *tb[CTA_PROTO_MAX];
495 struct nf_conntrack_protocol *proto;
496 int ret = 0;
497
c1d10adb
PNA		 498 nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
499
500 if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
501 return -EINVAL;
502
503 if (!tb[CTA_PROTO_NUM-1])
504 return -EINVAL;
505 tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
506
507 proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
508
509 if (likely(proto->nfattr_to_tuple))
510 ret = proto->nfattr_to_tuple(tb, tuple);
511
512 nf_ct_proto_put(proto);
513
514 return ret;
515}
516
517static inline int
518ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple,
519 enum ctattr_tuple type, u_int8_t l3num)
520{
521 struct nfattr *tb[CTA_TUPLE_MAX];
522 int err;
523
c1d10adb
PNA		 524 memset(tuple, 0, sizeof(*tuple));
525
526 nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
527
528 if (!tb[CTA_TUPLE_IP-1])
529 return -EINVAL;
530
531 tuple->src.l3num = l3num;
532
533 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
534 if (err < 0)
535 return err;
536
537 if (!tb[CTA_TUPLE_PROTO-1])
538 return -EINVAL;
539
540 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
541 if (err < 0)
542 return err;
543
544 /* orig and expect tuples get DIR_ORIGINAL */
545 if (type == CTA_TUPLE_REPLY)
546 tuple->dst.dir = IP_CT_DIR_REPLY;
547 else
548 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
549
c1d10adb
PNA		 550 return 0;
551}
552
553#ifdef CONFIG_IP_NF_NAT_NEEDED
554static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
555 [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t),
556 [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t),
557};
558
559static int ctnetlink_parse_nat_proto(struct nfattr *attr,
560 const struct nf_conn *ct,
561 struct ip_nat_range *range)
562{
563 struct nfattr *tb[CTA_PROTONAT_MAX];
564 struct ip_nat_protocol *npt;
565
c1d10adb
PNA		 566 nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
567
568 if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
569 return -EINVAL;
570
571 npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
572
573 if (!npt->nfattr_to_range) {
574 ip_nat_proto_put(npt);
575 return 0;
576 }
577
578 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
579 if (npt->nfattr_to_range(tb, range) > 0)
580 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
581
582 ip_nat_proto_put(npt);
583
c1d10adb
PNA		 584 return 0;
585}
586
587static const size_t cta_min_nat[CTA_NAT_MAX] = {
588 [CTA_NAT_MINIP-1] = sizeof(u_int32_t),
589 [CTA_NAT_MAXIP-1] = sizeof(u_int32_t),
590};
591
592static inline int
3726add7 593ctnetlink_parse_nat(struct nfattr *nat,
c1d10adb
PNA		 594 const struct nf_conn *ct, struct ip_nat_range *range)
595{
596 struct nfattr *tb[CTA_NAT_MAX];
597 int err;
598
c1d10adb
PNA		 599 memset(range, 0, sizeof(*range));
600
3726add7 601 nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
c1d10adb
PNA		 602
603 if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
604 return -EINVAL;
605
606 if (tb[CTA_NAT_MINIP-1])
607 range->min_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
608
609 if (!tb[CTA_NAT_MAXIP-1])
610 range->max_ip = range->min_ip;
611 else
612 range->max_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
613
614 if (range->min_ip)
615 range->flags |= IP_NAT_RANGE_MAP_IPS;
616
617 if (!tb[CTA_NAT_PROTO-1])
618 return 0;
619
620 err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
621 if (err < 0)
622 return err;
623
c1d10adb
PNA		 624 return 0;
625}
626#endif
627
628static inline int
629ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
630{
631 struct nfattr *tb[CTA_HELP_MAX];
632
c1d10adb
PNA		 633 nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
634
635 if (!tb[CTA_HELP_NAME-1])
636 return -EINVAL;
637
638 *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
639
640 return 0;
641}
642
643static const size_t cta_min[CTA_MAX] = {
644 [CTA_STATUS-1] = sizeof(u_int32_t),
645 [CTA_TIMEOUT-1] = sizeof(u_int32_t),
646 [CTA_MARK-1] = sizeof(u_int32_t),
647 [CTA_USE-1] = sizeof(u_int32_t),
648 [CTA_ID-1] = sizeof(u_int32_t)
649};
650
651static int
652ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
653 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
654{
655 struct nf_conntrack_tuple_hash *h;
656 struct nf_conntrack_tuple tuple;
657 struct nf_conn *ct;
658 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
659 u_int8_t u3 = nfmsg->nfgen_family;
660 int err = 0;
661
c1d10adb
PNA		 662 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
663 return -EINVAL;
664
665 if (cda[CTA_TUPLE_ORIG-1])
666 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
667 else if (cda[CTA_TUPLE_REPLY-1])
668 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
669 else {
670 /* Flush the whole table */
671 nf_conntrack_flush();
672 return 0;
673 }
674
675 if (err < 0)
676 return err;
677
678 h = nf_conntrack_find_get(&tuple, NULL);
9ea8cfd6 679 if (!h)
c1d10adb 680 return -ENOENT;
c1d10adb
PNA		 681
682 ct = nf_ct_tuplehash_to_ctrack(h);
683
684 if (cda[CTA_ID-1]) {
685 u_int32_t id = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_ID-1]));
686 if (ct->id != id) {
687 nf_ct_put(ct);
688 return -ENOENT;
689 }
690 }
691 if (del_timer(&ct->timeout))
692 ct->timeout.function((unsigned long)ct);
693
694 nf_ct_put(ct);
c1d10adb
PNA		 695
696 return 0;
697}
698
699static int
700ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
701 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
702{
703 struct nf_conntrack_tuple_hash *h;
704 struct nf_conntrack_tuple tuple;
705 struct nf_conn *ct;
706 struct sk_buff *skb2 = NULL;
707 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
708 u_int8_t u3 = nfmsg->nfgen_family;
709 int err = 0;
710
c1d10adb
PNA		 711 if (nlh->nlmsg_flags & NLM_F_DUMP) {
712 u32 rlen;
713
01f34848
PNA		 714#ifndef CONFIG_NF_CT_ACCT
715 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
c1d10adb
PNA		 716 return -ENOTSUPP;
717#endif
01f34848
PNA		 718 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
719 ctnetlink_dump_table,
720 ctnetlink_done)) != 0)
c1d10adb 721 return -EINVAL;
c1d10adb
PNA		 722
723 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
724 if (rlen > skb->len)
725 rlen = skb->len;
726 skb_pull(skb, rlen);
727 return 0;
728 }
729
730 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
731 return -EINVAL;
732
733 if (cda[CTA_TUPLE_ORIG-1])
734 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
735 else if (cda[CTA_TUPLE_REPLY-1])
736 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
737 else
738 return -EINVAL;
739
740 if (err < 0)
741 return err;
742
743 h = nf_conntrack_find_get(&tuple, NULL);
9ea8cfd6 744 if (!h)
c1d10adb 745 return -ENOENT;
9ea8cfd6 746
c1d10adb
PNA		 747 ct = nf_ct_tuplehash_to_ctrack(h);
748
749 err = -ENOMEM;
750 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
751 if (!skb2) {
752 nf_ct_put(ct);
753 return -ENOMEM;
754 }
755 NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
756
757 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
758 IPCTNL_MSG_CT_NEW, 1, ct);
759 nf_ct_put(ct);
760 if (err <= 0)
761 goto free;
762
763 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
764 if (err < 0)
765 goto out;
766
c1d10adb
PNA		 767 return 0;
768
769free:
770 kfree_skb(skb2);
771out:
772 return err;
773}
774
775static inline int
776ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[])
777{
778 unsigned long d;
779 unsigned status = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_STATUS-1]));
780 d = ct->status ^ status;
781
782 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
783 /* unchangeable */
784 return -EINVAL;
785
786 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
787 /* SEEN_REPLY bit can only be set */
788 return -EINVAL;
789
790
791 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
792 /* ASSURED bit can only be set */
793 return -EINVAL;
794
3726add7 795 if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
c1d10adb
PNA		 796#ifndef CONFIG_IP_NF_NAT_NEEDED
797 return -EINVAL;
798#else
c1d10adb
PNA		 799 struct ip_nat_range range;
800
3726add7
PM		 801 if (cda[CTA_NAT_DST-1]) {
802 if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
803 &range) < 0)
804 return -EINVAL;
805 if (ip_nat_initialized(ct,
806 HOOK2MANIP(NF_IP_PRE_ROUTING)))
807 return -EEXIST;
808 ip_nat_setup_info(ct, &range, hooknum);
809 }
810 if (cda[CTA_NAT_SRC-1]) {
811 if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
812 &range) < 0)
813 return -EINVAL;
814 if (ip_nat_initialized(ct,
815 HOOK2MANIP(NF_IP_POST_ROUTING)))
816 return -EEXIST;
817 ip_nat_setup_info(ct, &range, hooknum);
818 }
c1d10adb
PNA		 819#endif
820 }
821
822 /* Be careful here, modifying NAT bits can screw up things,
823 * so don't let users modify them directly if they don't pass
824 * ip_nat_range. */
825 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
826 return 0;
827}
828
829
830static inline int
831ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[])
832{
833 struct nf_conntrack_helper *helper;
dc808fe2 834 struct nf_conn_help *help = nfct_help(ct);
c1d10adb
PNA		 835 char *helpname;
836 int err;
837
dc808fe2
HW		 838 if (!help) {
839 /* FIXME: we need to reallocate and rehash */
840 return -EBUSY;
841 }
842
c1d10adb
PNA		 843 /* don't change helper of sibling connections */
844 if (ct->master)
845 return -EINVAL;
846
847 err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
848 if (err < 0)
849 return err;
850
851 helper = __nf_conntrack_helper_find_byname(helpname);
852 if (!helper) {
853 if (!strcmp(helpname, ""))
854 helper = NULL;
855 else
856 return -EINVAL;
857 }
858
dc808fe2 859 if (help->helper) {
c1d10adb
PNA		 860 if (!helper) {
861 /* we had a helper before ... */
862 nf_ct_remove_expectations(ct);
dc808fe2 863 help->helper = NULL;
c1d10adb
PNA		 864 } else {
865 /* need to zero data of old helper */
dc808fe2 866 memset(&help->help, 0, sizeof(help->help));
c1d10adb
PNA		 867 }
868 }
869
dc808fe2 870 help->helper = helper;
c1d10adb
PNA		 871
872 return 0;
873}
874
875static inline int
876ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[])
877{
878 u_int32_t timeout = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
879
880 if (!del_timer(&ct->timeout))
881 return -ETIME;
882
883 ct->timeout.expires = jiffies + timeout * HZ;
884 add_timer(&ct->timeout);
885
886 return 0;
887}
888
889static inline int
890ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[])
891{
892 struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
893 struct nf_conntrack_protocol *proto;
894 u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
895 u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
896 int err = 0;
897
898 nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
899
900 proto = nf_ct_proto_find_get(l3num, npt);
901
902 if (proto->from_nfattr)
903 err = proto->from_nfattr(tb, ct);
904 nf_ct_proto_put(proto);
905
906 return err;
907}
908
909static int
910ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[])
911{
912 int err;
913
c1d10adb
PNA		 914 if (cda[CTA_HELP-1]) {
915 err = ctnetlink_change_helper(ct, cda);
916 if (err < 0)
917 return err;
918 }
919
920 if (cda[CTA_TIMEOUT-1]) {
921 err = ctnetlink_change_timeout(ct, cda);
922 if (err < 0)
923 return err;
924 }
925
926 if (cda[CTA_STATUS-1]) {
927 err = ctnetlink_change_status(ct, cda);
928 if (err < 0)
929 return err;
930 }
931
932 if (cda[CTA_PROTOINFO-1]) {
933 err = ctnetlink_change_protoinfo(ct, cda);
934 if (err < 0)
935 return err;
936 }
937
bcd1e830 938#if defined(CONFIG_NF_CONNTRACK_MARK)
c1d10adb
PNA		 939 if (cda[CTA_MARK-1])
940 ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
941#endif
942
c1d10adb
PNA		 943 return 0;
944}
945
946static int
947ctnetlink_create_conntrack(struct nfattr *cda[],
948 struct nf_conntrack_tuple *otuple,
949 struct nf_conntrack_tuple *rtuple)
950{
951 struct nf_conn *ct;
952 int err = -EINVAL;
dafc741c 953 struct nf_conn_help *help;
c1d10adb 954
c1d10adb
PNA		 955 ct = nf_conntrack_alloc(otuple, rtuple);
956 if (ct == NULL || IS_ERR(ct))
957 return -ENOMEM;
958
959 if (!cda[CTA_TIMEOUT-1])
960 goto err;
961 ct->timeout.expires = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
962
963 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
964 ct->status |= IPS_CONFIRMED;
965
966 err = ctnetlink_change_status(ct, cda);
967 if (err < 0)
968 goto err;
969
970 if (cda[CTA_PROTOINFO-1]) {
971 err = ctnetlink_change_protoinfo(ct, cda);
972 if (err < 0)
973 return err;
974 }
975
bcd1e830 976#if defined(CONFIG_NF_CONNTRACK_MARK)
c1d10adb
PNA		 977 if (cda[CTA_MARK-1])
978 ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
979#endif
980
dafc741c
YK		 981 help = nfct_help(ct);
982 if (help)
983 help->helper = nf_ct_helper_find_get(rtuple);
984
c1d10adb
PNA		 985 add_timer(&ct->timeout);
986 nf_conntrack_hash_insert(ct);
987
dafc741c
YK		 988 if (help && help->helper)
989 nf_ct_helper_put(help->helper);
990
c1d10adb
PNA		 991 return 0;
992
993err:
994 nf_conntrack_free(ct);
995 return err;
996}
997
998static int
999ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1000 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1001{
1002 struct nf_conntrack_tuple otuple, rtuple;
1003 struct nf_conntrack_tuple_hash *h = NULL;
1004 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1005 u_int8_t u3 = nfmsg->nfgen_family;
1006 int err = 0;
1007
c1d10adb
PNA		 1008 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
1009 return -EINVAL;
1010
1011 if (cda[CTA_TUPLE_ORIG-1]) {
1012 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1013 if (err < 0)
1014 return err;
1015 }
1016
1017 if (cda[CTA_TUPLE_REPLY-1]) {
1018 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1019 if (err < 0)
1020 return err;
1021 }
1022
1023 write_lock_bh(&nf_conntrack_lock);
1024 if (cda[CTA_TUPLE_ORIG-1])
1025 h = __nf_conntrack_find(&otuple, NULL);
1026 else if (cda[CTA_TUPLE_REPLY-1])
1027 h = __nf_conntrack_find(&rtuple, NULL);
1028
1029 if (h == NULL) {
1030 write_unlock_bh(&nf_conntrack_lock);
c1d10adb
PNA		 1031 err = -ENOENT;
1032 if (nlh->nlmsg_flags & NLM_F_CREATE)
1033 err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
1034 return err;
1035 }
1036 /* implicit 'else' */
1037
1038 /* we only allow nat config for new conntracks */
3726add7 1039 if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
c1d10adb
PNA		 1040 err = -EINVAL;
1041 goto out_unlock;
1042 }
1043
1044 /* We manipulate the conntrack inside the global conntrack table lock,
1045 * so there's no need to increase the refcount */
c1d10adb
PNA		 1046 err = -EEXIST;
1047 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1048 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda);
1049
1050out_unlock:
1051 write_unlock_bh(&nf_conntrack_lock);
1052 return err;
1053}
1054
1055/***********************************************************************
1056 * EXPECT
1057 ***********************************************************************/
1058
1059static inline int
1060ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1061 const struct nf_conntrack_tuple *tuple,
1062 enum ctattr_expect type)
1063{
1064 struct nfattr *nest_parms = NFA_NEST(skb, type);
1065
1066 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1067 goto nfattr_failure;
1068
1069 NFA_NEST_END(skb, nest_parms);
1070
1071 return 0;
1072
1073nfattr_failure:
1074 return -1;
1075}
1076
1cde6436
PNA		 1077static inline int
1078ctnetlink_exp_dump_mask(struct sk_buff *skb,
1079 const struct nf_conntrack_tuple *tuple,
1080 const struct nf_conntrack_tuple *mask)
1081{
1082 int ret;
1083 struct nf_conntrack_l3proto *l3proto;
1084 struct nf_conntrack_protocol *proto;
1085 struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
1086
1087 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1088 ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto);
1089 nf_ct_l3proto_put(l3proto);
1090
1091 if (unlikely(ret < 0))
1092 goto nfattr_failure;
1093
1094 proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1095 ret = ctnetlink_dump_tuples_proto(skb, mask, proto);
1096 nf_ct_proto_put(proto);
1097 if (unlikely(ret < 0))
1098 goto nfattr_failure;
1099
1100 NFA_NEST_END(skb, nest_parms);
1101
1102 return 0;
1103
1104nfattr_failure:
1105 return -1;
1106}
1107
c1d10adb
PNA		 1108static inline int
1109ctnetlink_exp_dump_expect(struct sk_buff *skb,
1110 const struct nf_conntrack_expect *exp)
1111{
1112 struct nf_conn *master = exp->master;
1113 u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1114 u_int32_t id = htonl(exp->id);
1115
1116 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1117 goto nfattr_failure;
1cde6436 1118 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
c1d10adb
PNA		 1119 goto nfattr_failure;
1120 if (ctnetlink_exp_dump_tuple(skb,
1121 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1122 CTA_EXPECT_MASTER) < 0)
1123 goto nfattr_failure;
1124
1125 NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1126 NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1127
1128 return 0;
1129
1130nfattr_failure:
1131 return -1;
1132}
1133
1134static int
1135ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1136 int event,
1137 int nowait,
1138 const struct nf_conntrack_expect *exp)
1139{
1140 struct nlmsghdr *nlh;
1141 struct nfgenmsg *nfmsg;
1142 unsigned char *b;
1143
1144 b = skb->tail;
1145
1146 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1147 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1148 nfmsg = NLMSG_DATA(nlh);
1149
1150 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1151 nfmsg->nfgen_family = exp->tuple.src.l3num;
1152 nfmsg->version = NFNETLINK_V0;
1153 nfmsg->res_id = 0;
1154
1155 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1156 goto nfattr_failure;
1157
1158 nlh->nlmsg_len = skb->tail - b;
1159 return skb->len;
1160
1161nlmsg_failure:
1162nfattr_failure:
1163 skb_trim(skb, b - skb->data);
1164 return -1;
1165}
1166
1167#ifdef CONFIG_NF_CONNTRACK_EVENTS
1168static int ctnetlink_expect_event(struct notifier_block *this,
1169 unsigned long events, void *ptr)
1170{
1171 struct nlmsghdr *nlh;
1172 struct nfgenmsg *nfmsg;
1173 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1174 struct sk_buff *skb;
1175 unsigned int type;
1176 unsigned char *b;
1177 int flags = 0;
1178
1179 if (events & IPEXP_NEW) {
1180 type = IPCTNL_MSG_EXP_NEW;
1181 flags = NLM_F_CREATE|NLM_F_EXCL;
1182 } else
1183 return NOTIFY_DONE;
1184
b3a27bfb
PNA		 1185 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1186 return NOTIFY_DONE;
1187
c1d10adb
PNA		 1188 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1189 if (!skb)
1190 return NOTIFY_DONE;
1191
1192 b = skb->tail;
1193
b633ad5f 1194 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
c1d10adb
PNA		 1195 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1196 nfmsg = NLMSG_DATA(nlh);
1197
1198 nlh->nlmsg_flags = flags;
1199 nfmsg->nfgen_family = exp->tuple.src.l3num;
1200 nfmsg->version = NFNETLINK_V0;
1201 nfmsg->res_id = 0;
1202
1203 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1204 goto nfattr_failure;
1205
1206 nlh->nlmsg_len = skb->tail - b;
1207 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1208 return NOTIFY_DONE;
1209
1210nlmsg_failure:
1211nfattr_failure:
1212 kfree_skb(skb);
1213 return NOTIFY_DONE;
1214}
1215#endif
1216
1217static int
1218ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1219{
1220 struct nf_conntrack_expect *exp = NULL;
1221 struct list_head *i;
1222 u_int32_t *id = (u_int32_t *) &cb->args[0];
87711cb8
PNA		 1223 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1224 u_int8_t l3proto = nfmsg->nfgen_family;
c1d10adb 1225
c1d10adb
PNA		 1226 read_lock_bh(&nf_conntrack_lock);
1227 list_for_each_prev(i, &nf_conntrack_expect_list) {
1228 exp = (struct nf_conntrack_expect *) i;
87711cb8
PNA		 1229 if (l3proto && exp->tuple.src.l3num != l3proto)
1230 continue;
c1d10adb
PNA		 1231 if (exp->id <= *id)
1232 continue;
1233 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1234 cb->nlh->nlmsg_seq,
1235 IPCTNL_MSG_EXP_NEW,
1236 1, exp) < 0)
1237 goto out;
1238 *id = exp->id;
1239 }
1240out:
1241 read_unlock_bh(&nf_conntrack_lock);
1242
c1d10adb
PNA		 1243 return skb->len;
1244}
1245
1246static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
1247 [CTA_EXPECT_TIMEOUT-1] = sizeof(u_int32_t),
1248 [CTA_EXPECT_ID-1] = sizeof(u_int32_t)
1249};
1250
1251static int
1252ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1253 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1254{
1255 struct nf_conntrack_tuple tuple;
1256 struct nf_conntrack_expect *exp;
1257 struct sk_buff *skb2;
1258 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1259 u_int8_t u3 = nfmsg->nfgen_family;
1260 int err = 0;
1261
c1d10adb
PNA		 1262 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1263 return -EINVAL;
1264
1265 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1266 u32 rlen;
1267
c1d10adb
PNA		 1268 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
1269 ctnetlink_exp_dump_table,
1270 ctnetlink_done)) != 0)
1271 return -EINVAL;
1272 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1273 if (rlen > skb->len)
1274 rlen = skb->len;
1275 skb_pull(skb, rlen);
1276 return 0;
1277 }
1278
1279 if (cda[CTA_EXPECT_MASTER-1])
1280 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1281 else
1282 return -EINVAL;
1283
1284 if (err < 0)
1285 return err;
1286
1287 exp = nf_conntrack_expect_find(&tuple);
1288 if (!exp)
1289 return -ENOENT;
1290
1291 if (cda[CTA_EXPECT_ID-1]) {
1292 u_int32_t id = *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1293 if (exp->id != ntohl(id)) {
1294 nf_conntrack_expect_put(exp);
1295 return -ENOENT;
1296 }
1297 }
1298
1299 err = -ENOMEM;
1300 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1301 if (!skb2)
1302 goto out;
1303 NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
1304
1305 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1306 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1307 1, exp);
1308 if (err <= 0)
1309 goto free;
1310
1311 nf_conntrack_expect_put(exp);
1312
1313 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1314
1315free:
1316 kfree_skb(skb2);
1317out:
1318 nf_conntrack_expect_put(exp);
1319 return err;
1320}
1321
1322static int
1323ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1324 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1325{
1326 struct nf_conntrack_expect *exp, *tmp;
1327 struct nf_conntrack_tuple tuple;
1328 struct nf_conntrack_helper *h;
1329 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1330 u_int8_t u3 = nfmsg->nfgen_family;
1331 int err;
1332
1333 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1334 return -EINVAL;
1335
1336 if (cda[CTA_EXPECT_TUPLE-1]) {
1337 /* delete a single expect by tuple */
1338 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1339 if (err < 0)
1340 return err;
1341
1342 /* bump usage count to 2 */
1343 exp = nf_conntrack_expect_find(&tuple);
1344 if (!exp)
1345 return -ENOENT;
1346
1347 if (cda[CTA_EXPECT_ID-1]) {
1348 u_int32_t id =
1349 *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1350 if (exp->id != ntohl(id)) {
1351 nf_conntrack_expect_put(exp);
1352 return -ENOENT;
1353 }
1354 }
1355
1356 /* after list removal, usage count == 1 */
1357 nf_conntrack_unexpect_related(exp);
1358 /* have to put what we 'get' above.
1359 * after this line usage count == 0 */
1360 nf_conntrack_expect_put(exp);
1361 } else if (cda[CTA_EXPECT_HELP_NAME-1]) {
1362 char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
1363
1364 /* delete all expectations for this helper */
1365 write_lock_bh(&nf_conntrack_lock);
1366 h = __nf_conntrack_helper_find_byname(name);
1367 if (!h) {
1368 write_unlock_bh(&nf_conntrack_lock);
1369 return -EINVAL;
1370 }
1371 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1372 list) {
dc808fe2
HW		 1373 struct nf_conn_help *m_help = nfct_help(exp->master);
1374 if (m_help->helper == h
c1d10adb
PNA		 1375 && del_timer(&exp->timeout)) {
1376 nf_ct_unlink_expect(exp);
1377 nf_conntrack_expect_put(exp);
1378 }
1379 }
1380 write_unlock_bh(&nf_conntrack_lock);
1381 } else {
1382 /* This basically means we have to flush everything*/
1383 write_lock_bh(&nf_conntrack_lock);
1384 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1385 list) {
1386 if (del_timer(&exp->timeout)) {
1387 nf_ct_unlink_expect(exp);
1388 nf_conntrack_expect_put(exp);
1389 }
1390 }
1391 write_unlock_bh(&nf_conntrack_lock);
1392 }
1393
1394 return 0;
1395}
1396static int
1397ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[])
1398{
1399 return -EOPNOTSUPP;
1400}
1401
1402static int
1403ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3)
1404{
1405 struct nf_conntrack_tuple tuple, mask, master_tuple;
1406 struct nf_conntrack_tuple_hash *h = NULL;
1407 struct nf_conntrack_expect *exp;
1408 struct nf_conn *ct;
dc808fe2 1409 struct nf_conn_help *help;
c1d10adb
PNA		 1410 int err = 0;
1411
c1d10adb
PNA		 1412 /* caller guarantees that those three CTA_EXPECT_* exist */
1413 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1414 if (err < 0)
1415 return err;
1416 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1417 if (err < 0)
1418 return err;
1419 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1420 if (err < 0)
1421 return err;
1422
1423 /* Look for master conntrack of this expectation */
1424 h = nf_conntrack_find_get(&master_tuple, NULL);
1425 if (!h)
1426 return -ENOENT;
1427 ct = nf_ct_tuplehash_to_ctrack(h);
dc808fe2 1428 help = nfct_help(ct);
c1d10adb 1429
dc808fe2 1430 if (!help || !help->helper) {
c1d10adb
PNA		 1431 /* such conntrack hasn't got any helper, abort */
1432 err = -EINVAL;
1433 goto out;
1434 }
1435
1436 exp = nf_conntrack_expect_alloc(ct);
1437 if (!exp) {
1438 err = -ENOMEM;
1439 goto out;
1440 }
1441
1442 exp->expectfn = NULL;
1443 exp->flags = 0;
1444 exp->master = ct;
1445 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1446 memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple));
1447
1448 err = nf_conntrack_expect_related(exp);
1449 nf_conntrack_expect_put(exp);
1450
1451out:
1452 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1453 return err;
1454}
1455
1456static int
1457ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1458 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1459{
1460 struct nf_conntrack_tuple tuple;
1461 struct nf_conntrack_expect *exp;
1462 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1463 u_int8_t u3 = nfmsg->nfgen_family;
1464 int err = 0;
1465
c1d10adb
PNA		 1466 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1467 return -EINVAL;
1468
1469 if (!cda[CTA_EXPECT_TUPLE-1]
1470 || !cda[CTA_EXPECT_MASK-1]
1471 || !cda[CTA_EXPECT_MASTER-1])
1472 return -EINVAL;
1473
1474 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1475 if (err < 0)
1476 return err;
1477
1478 write_lock_bh(&nf_conntrack_lock);
1479 exp = __nf_conntrack_expect_find(&tuple);
1480
1481 if (!exp) {
1482 write_unlock_bh(&nf_conntrack_lock);
1483 err = -ENOENT;
1484 if (nlh->nlmsg_flags & NLM_F_CREATE)
1485 err = ctnetlink_create_expect(cda, u3);
1486 return err;
1487 }
1488
1489 err = -EEXIST;
1490 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1491 err = ctnetlink_change_expect(exp, cda);
1492 write_unlock_bh(&nf_conntrack_lock);
1493
c1d10adb
PNA		 1494 return err;
1495}
1496
1497#ifdef CONFIG_NF_CONNTRACK_EVENTS
1498static struct notifier_block ctnl_notifier = {
1499 .notifier_call = ctnetlink_conntrack_event,
1500};
1501
1502static struct notifier_block ctnl_notifier_exp = {
1503 .notifier_call = ctnetlink_expect_event,
1504};
1505#endif
1506
1507static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1508 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1509 .attr_count = CTA_MAX, },
1510 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1511 .attr_count = CTA_MAX, },
1512 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1513 .attr_count = CTA_MAX, },
1514 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1515 .attr_count = CTA_MAX, },
1516};
1517
1518static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1519 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1520 .attr_count = CTA_EXPECT_MAX, },
1521 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1522 .attr_count = CTA_EXPECT_MAX, },
1523 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1524 .attr_count = CTA_EXPECT_MAX, },
1525};
1526
1527static struct nfnetlink_subsystem ctnl_subsys = {
1528 .name = "conntrack",
1529 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1530 .cb_count = IPCTNL_MSG_MAX,
1531 .cb = ctnl_cb,
1532};
1533
1534static struct nfnetlink_subsystem ctnl_exp_subsys = {
1535 .name = "conntrack_expect",
1536 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1537 .cb_count = IPCTNL_MSG_EXP_MAX,
1538 .cb = ctnl_exp_cb,
1539};
1540
1541MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
34f9a2e4 1542MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
c1d10adb
PNA		 1543
1544static int __init ctnetlink_init(void)
1545{
1546 int ret;
1547
1548 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1549 ret = nfnetlink_subsys_register(&ctnl_subsys);
1550 if (ret < 0) {
1551 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1552 goto err_out;
1553 }
1554
1555 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1556 if (ret < 0) {
1557 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1558 goto err_unreg_subsys;
1559 }
1560
1561#ifdef CONFIG_NF_CONNTRACK_EVENTS
1562 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1563 if (ret < 0) {
1564 printk("ctnetlink_init: cannot register notifier.\n");
1565 goto err_unreg_exp_subsys;
1566 }
1567
1568 ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp);
1569 if (ret < 0) {
1570 printk("ctnetlink_init: cannot expect register notifier.\n");
1571 goto err_unreg_notifier;
1572 }
1573#endif
1574
1575 return 0;
1576
1577#ifdef CONFIG_NF_CONNTRACK_EVENTS
1578err_unreg_notifier:
1579 nf_conntrack_unregister_notifier(&ctnl_notifier);
1580err_unreg_exp_subsys:
1581 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1582#endif
1583err_unreg_subsys:
1584 nfnetlink_subsys_unregister(&ctnl_subsys);
1585err_out:
1586 return ret;
1587}
1588
1589static void __exit ctnetlink_exit(void)
1590{
1591 printk("ctnetlink: unregistering from nfnetlink.\n");
1592
1593#ifdef CONFIG_NF_CONNTRACK_EVENTS
e64a70be 1594 nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp);
c1d10adb
PNA		 1595 nf_conntrack_unregister_notifier(&ctnl_notifier);
1596#endif
1597
1598 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1599 nfnetlink_subsys_unregister(&ctnl_subsys);
1600 return;
1601}
1602
1603module_init(ctnetlink_init);
1604module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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