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[NETFILTER] nat: remove bogus structure member
[deliverable/linux.git] / net / ipv4 / netfilter / ip_conntrack_netlink.c
CommitLineData
080774a2
HW		 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) 2002-2005 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005 by Pablo Neira Ayuso <pablo@eurodev.net>
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
21#include <linux/init.h>
22#include <linux/module.h>
23#include <linux/kernel.h>
24#include <linux/types.h>
25#include <linux/timer.h>
26#include <linux/skbuff.h>
27#include <linux/errno.h>
28#include <linux/netlink.h>
29#include <linux/spinlock.h>
30#include <linux/notifier.h>
31#include <linux/rtnetlink.h>
32
33#include <linux/netfilter.h>
34#include <linux/netfilter_ipv4.h>
35#include <linux/netfilter_ipv4/ip_tables.h>
36#include <linux/netfilter_ipv4/ip_conntrack.h>
37#include <linux/netfilter_ipv4/ip_conntrack_core.h>
38#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
39#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
40#include <linux/netfilter_ipv4/ip_nat_protocol.h>
41
42#include <linux/netfilter/nfnetlink.h>
43#include <linux/netfilter/nfnetlink_conntrack.h>
44
45MODULE_LICENSE("GPL");
46
47static char __initdata version[] = "0.90";
48
49#if 0
50#define DEBUGP printk
51#else
52#define DEBUGP(format, args...)
53#endif
54
55
56static inline int
57ctnetlink_dump_tuples_proto(struct sk_buff *skb,
58 const struct ip_conntrack_tuple *tuple)
59{
60 struct ip_conntrack_protocol *proto;
61
62 NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
63
64 proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
65 if (proto && proto->tuple_to_nfattr)
66 return proto->tuple_to_nfattr(skb, tuple);
67
68 return 0;
69
70nfattr_failure:
71 return -1;
72}
73
74static inline int
75ctnetlink_dump_tuples(struct sk_buff *skb,
76 const struct ip_conntrack_tuple *tuple)
77{
78 struct nfattr *nest_parms;
79
80 nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
81 NFA_PUT(skb, CTA_IP_V4_SRC, sizeof(u_int32_t), &tuple->src.ip);
82 NFA_PUT(skb, CTA_IP_V4_DST, sizeof(u_int32_t), &tuple->dst.ip);
83 NFA_NEST_END(skb, nest_parms);
84
85 nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
86 ctnetlink_dump_tuples_proto(skb, tuple);
87 NFA_NEST_END(skb, nest_parms);
88
89 return 0;
90
91nfattr_failure:
92 return -1;
93}
94
95static inline int
96ctnetlink_dump_status(struct sk_buff *skb, const struct ip_conntrack *ct)
97{
98 u_int32_t status = htonl((u_int32_t) ct->status);
99 NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
100 return 0;
101
102nfattr_failure:
103 return -1;
104}
105
106static inline int
107ctnetlink_dump_timeout(struct sk_buff *skb, const struct ip_conntrack *ct)
108{
109 long timeout_l = ct->timeout.expires - jiffies;
110 u_int32_t timeout;
111
112 if (timeout_l < 0)
113 timeout = 0;
114 else
115 timeout = htonl(timeout_l / HZ);
116
117 NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
118 return 0;
119
120nfattr_failure:
121 return -1;
122}
123
124static inline int
125ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
126{
127 struct ip_conntrack_protocol *proto = ip_conntrack_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
128
129 struct nfattr *nest_proto;
130 int ret;
131
132 if (!proto || !proto->to_nfattr)
133 return 0;
134
135 nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
136
137 ret = proto->to_nfattr(skb, nest_proto, ct);
138
139 ip_conntrack_proto_put(proto);
140
141 NFA_NEST_END(skb, nest_proto);
142
143 return ret;
144
145nfattr_failure:
146 return -1;
147}
148
149static inline int
150ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
151{
152 struct nfattr *nest_helper;
153
154 if (!ct->helper)
155 return 0;
156
157 nest_helper = NFA_NEST(skb, CTA_HELP);
158 NFA_PUT(skb, CTA_HELP_NAME, CTA_HELP_MAXNAMESIZE, &ct->helper->name);
159
160 if (ct->helper->to_nfattr)
161 ct->helper->to_nfattr(skb, ct);
162
163 NFA_NEST_END(skb, nest_helper);
164
165 return 0;
166
167nfattr_failure:
168 return -1;
169}
170
171#ifdef CONFIG_IP_NF_CT_ACCT
172static inline int
173ctnetlink_dump_counters(struct sk_buff *skb, const struct ip_conntrack *ct,
174 enum ip_conntrack_dir dir)
175{
176 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
177 struct nfattr *nest_count = NFA_NEST(skb, type);
178 u_int64_t tmp;
179
180 tmp = cpu_to_be64(ct->counters[dir].packets);
181 NFA_PUT(skb, CTA_COUNTERS_PACKETS, sizeof(u_int64_t), &tmp);
182
183 tmp = cpu_to_be64(ct->counters[dir].bytes);
184 NFA_PUT(skb, CTA_COUNTERS_BYTES, sizeof(u_int64_t), &tmp);
185
186 NFA_NEST_END(skb, nest_count);
187
188 return 0;
189
190nfattr_failure:
191 return -1;
192}
193#else
194#define ctnetlink_dump_counters(a, b, c) (0)
195#endif
196
197#ifdef CONFIG_IP_NF_CONNTRACK_MARK
198static inline int
199ctnetlink_dump_mark(struct sk_buff *skb, const struct ip_conntrack *ct)
200{
201 u_int32_t mark = htonl(ct->mark);
202
203 NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
204 return 0;
205
206nfattr_failure:
207 return -1;
208}
209#else
210#define ctnetlink_dump_mark(a, b) (0)
211#endif
212
213static inline int
214ctnetlink_dump_id(struct sk_buff *skb, const struct ip_conntrack *ct)
215{
216 u_int32_t id = htonl(ct->id);
217 NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
218 return 0;
219
220nfattr_failure:
221 return -1;
222}
223
224static inline int
225ctnetlink_dump_use(struct sk_buff *skb, const struct ip_conntrack *ct)
226{
227 unsigned int use = htonl(atomic_read(&ct->ct_general.use));
228
229 NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
230 return 0;
231
232nfattr_failure:
233 return -1;
234}
235
236#define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
237
238static int
239ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
240 int event, int nowait,
241 const struct ip_conntrack *ct)
242{
243 struct nlmsghdr *nlh;
244 struct nfgenmsg *nfmsg;
245 struct nfattr *nest_parms;
246 unsigned char *b;
247
248 b = skb->tail;
249
250 event |= NFNL_SUBSYS_CTNETLINK << 8;
251 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
252 nfmsg = NLMSG_DATA(nlh);
253
254 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
255 nfmsg->nfgen_family = AF_INET;
256 nfmsg->version = NFNETLINK_V0;
257 nfmsg->res_id = 0;
258
259 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
260 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
261 goto nfattr_failure;
262 NFA_NEST_END(skb, nest_parms);
263
264 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
265 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
266 goto nfattr_failure;
267 NFA_NEST_END(skb, nest_parms);
268
269 if (ctnetlink_dump_status(skb, ct) < 0 ||
270 ctnetlink_dump_timeout(skb, ct) < 0 ||
271 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
272 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
273 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
274 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
275 ctnetlink_dump_mark(skb, ct) < 0 ||
276 ctnetlink_dump_id(skb, ct) < 0 ||
277 ctnetlink_dump_use(skb, ct) < 0)
278 goto nfattr_failure;
279
280 nlh->nlmsg_len = skb->tail - b;
281 return skb->len;
282
283nlmsg_failure:
284nfattr_failure:
285 skb_trim(skb, b - skb->data);
286 return -1;
287}
288
289#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
290static int ctnetlink_conntrack_event(struct notifier_block *this,
291 unsigned long events, void *ptr)
292{
293 struct nlmsghdr *nlh;
294 struct nfgenmsg *nfmsg;
295 struct nfattr *nest_parms;
296 struct ip_conntrack *ct = (struct ip_conntrack *)ptr;
297 struct sk_buff *skb;
298 unsigned int type;
299 unsigned char *b;
ac6d439d 300 unsigned int flags = 0, group;
080774a2
HW		 301
302 /* ignore our fake conntrack entry */
303 if (ct == &ip_conntrack_untracked)
304 return NOTIFY_DONE;
305
306 if (events & IPCT_DESTROY) {
307 type = IPCTNL_MSG_CT_DELETE;
ac6d439d 308 group = NFNLGRP_CONNTRACK_DESTROY;
080774a2
HW		 309 goto alloc_skb;
310 }
311 if (events & (IPCT_NEW | IPCT_RELATED)) {
312 type = IPCTNL_MSG_CT_NEW;
313 flags = NLM_F_CREATE|NLM_F_EXCL;
314 /* dump everything */
315 events = ~0UL;
ac6d439d 316 group = NFNLGRP_CONNTRACK_NEW;
080774a2
HW		 317 goto alloc_skb;
318 }
319 if (events & (IPCT_STATUS |
320 IPCT_PROTOINFO |
321 IPCT_HELPER |
322 IPCT_HELPINFO |
323 IPCT_NATINFO)) {
324 type = IPCTNL_MSG_CT_NEW;
ac6d439d 325 group = NFNLGRP_CONNTRACK_UPDATE;
080774a2
HW		 326 goto alloc_skb;
327 }
328
329 return NOTIFY_DONE;
330
331alloc_skb:
332 /* FIXME: Check if there are any listeners before, don't hurt performance */
333
334 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
335 if (!skb)
336 return NOTIFY_DONE;
337
338 b = skb->tail;
339
340 type |= NFNL_SUBSYS_CTNETLINK << 8;
341 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
342 nfmsg = NLMSG_DATA(nlh);
343
344 nlh->nlmsg_flags = flags;
345 nfmsg->nfgen_family = AF_INET;
346 nfmsg->version = NFNETLINK_V0;
347 nfmsg->res_id = 0;
348
349 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
350 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
351 goto nfattr_failure;
352 NFA_NEST_END(skb, nest_parms);
353
354 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
355 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
356 goto nfattr_failure;
357 NFA_NEST_END(skb, nest_parms);
358
359 /* NAT stuff is now a status flag */
360 if ((events & IPCT_STATUS || events & IPCT_NATINFO)
361 && ctnetlink_dump_status(skb, ct) < 0)
362 goto nfattr_failure;
363 if (events & IPCT_REFRESH
364 && ctnetlink_dump_timeout(skb, ct) < 0)
365 goto nfattr_failure;
366 if (events & IPCT_PROTOINFO
367 && ctnetlink_dump_protoinfo(skb, ct) < 0)
368 goto nfattr_failure;
369 if (events & IPCT_HELPINFO
370 && ctnetlink_dump_helpinfo(skb, ct) < 0)
371 goto nfattr_failure;
372
373 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
374 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
375 goto nfattr_failure;
376
377 nlh->nlmsg_len = skb->tail - b;
ac6d439d 378 nfnetlink_send(skb, 0, group, 0);
080774a2
HW		 379 return NOTIFY_DONE;
380
381nlmsg_failure:
382nfattr_failure:
383 kfree_skb(skb);
384 return NOTIFY_DONE;
385}
386#endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
387
388static int ctnetlink_done(struct netlink_callback *cb)
389{
390 DEBUGP("entered %s\n", __FUNCTION__);
391 return 0;
392}
393
394static int
395ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
396{
397 struct ip_conntrack *ct = NULL;
398 struct ip_conntrack_tuple_hash *h;
399 struct list_head *i;
400 u_int32_t *id = (u_int32_t *) &cb->args[1];
401
402 DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__,
403 cb->args[0], *id);
404
405 read_lock_bh(&ip_conntrack_lock);
406 for (; cb->args[0] < ip_conntrack_htable_size; cb->args[0]++, *id = 0) {
ff21d577 407 list_for_each_prev(i, &ip_conntrack_hash[cb->args[0]]) {
080774a2
HW		 408 h = (struct ip_conntrack_tuple_hash *) i;
409 if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
410 continue;
411 ct = tuplehash_to_ctrack(h);
412 if (ct->id <= *id)
413 continue;
414 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
415 cb->nlh->nlmsg_seq,
416 IPCTNL_MSG_CT_NEW,
417 1, ct) < 0)
418 goto out;
419 *id = ct->id;
420 }
421 }
422out:
423 read_unlock_bh(&ip_conntrack_lock);
424
425 DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
426
427 return skb->len;
428}
429
430#ifdef CONFIG_IP_NF_CT_ACCT
431static int
432ctnetlink_dump_table_w(struct sk_buff *skb, struct netlink_callback *cb)
433{
434 struct ip_conntrack *ct = NULL;
435 struct ip_conntrack_tuple_hash *h;
436 struct list_head *i;
437 u_int32_t *id = (u_int32_t *) &cb->args[1];
438
439 DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__,
440 cb->args[0], *id);
441
442 write_lock_bh(&ip_conntrack_lock);
443 for (; cb->args[0] < ip_conntrack_htable_size; cb->args[0]++, *id = 0) {
ff21d577 444 list_for_each_prev(i, &ip_conntrack_hash[cb->args[0]]) {
080774a2
HW		 445 h = (struct ip_conntrack_tuple_hash *) i;
446 if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
447 continue;
448 ct = tuplehash_to_ctrack(h);
449 if (ct->id <= *id)
450 continue;
451 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
452 cb->nlh->nlmsg_seq,
453 IPCTNL_MSG_CT_NEW,
454 1, ct) < 0)
455 goto out;
456 *id = ct->id;
457
458 memset(&ct->counters, 0, sizeof(ct->counters));
459 }
460 }
461out:
462 write_unlock_bh(&ip_conntrack_lock);
463
464 DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
465
466 return skb->len;
467}
468#endif
469
470static const int cta_min_ip[CTA_IP_MAX] = {
471 [CTA_IP_V4_SRC-1] = sizeof(u_int32_t),
472 [CTA_IP_V4_DST-1] = sizeof(u_int32_t),
473};
474
475static inline int
476ctnetlink_parse_tuple_ip(struct nfattr *attr, struct ip_conntrack_tuple *tuple)
477{
478 struct nfattr *tb[CTA_IP_MAX];
479
480 DEBUGP("entered %s\n", __FUNCTION__);
481
080774a2
HW		 482
483 if (nfattr_parse_nested(tb, CTA_IP_MAX, attr) < 0)
484 goto nfattr_failure;
485
486 if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip))
487 return -EINVAL;
488
489 if (!tb[CTA_IP_V4_SRC-1])
490 return -EINVAL;
491 tuple->src.ip = *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_SRC-1]);
492
493 if (!tb[CTA_IP_V4_DST-1])
494 return -EINVAL;
495 tuple->dst.ip = *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_DST-1]);
496
497 DEBUGP("leaving\n");
498
499 return 0;
500
501nfattr_failure:
502 return -1;
503}
504
505static const int cta_min_proto[CTA_PROTO_MAX] = {
506 [CTA_PROTO_NUM-1] = sizeof(u_int16_t),
507 [CTA_PROTO_SRC_PORT-1] = sizeof(u_int16_t),
508 [CTA_PROTO_DST_PORT-1] = sizeof(u_int16_t),
509 [CTA_PROTO_ICMP_TYPE-1] = sizeof(u_int8_t),
510 [CTA_PROTO_ICMP_CODE-1] = sizeof(u_int8_t),
511 [CTA_PROTO_ICMP_ID-1] = sizeof(u_int16_t),
512};
513
514static inline int
515ctnetlink_parse_tuple_proto(struct nfattr *attr,
516 struct ip_conntrack_tuple *tuple)
517{
518 struct nfattr *tb[CTA_PROTO_MAX];
519 struct ip_conntrack_protocol *proto;
520 int ret = 0;
521
522 DEBUGP("entered %s\n", __FUNCTION__);
523
080774a2
HW		 524 if (nfattr_parse_nested(tb, CTA_PROTO_MAX, attr) < 0)
525 goto nfattr_failure;
526
527 if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
528 return -EINVAL;
529
530 if (!tb[CTA_PROTO_NUM-1])
531 return -EINVAL;
532 tuple->dst.protonum = *(u_int16_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
533
534 proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
535
536 if (likely(proto && proto->nfattr_to_tuple)) {
537 ret = proto->nfattr_to_tuple(tb, tuple);
538 ip_conntrack_proto_put(proto);
539 }
540
541 return ret;
542
543nfattr_failure:
544 return -1;
545}
546
547static inline int
548ctnetlink_parse_tuple(struct nfattr *cda[], struct ip_conntrack_tuple *tuple,
549 enum ctattr_tuple type)
550{
551 struct nfattr *tb[CTA_TUPLE_MAX];
552 int err;
553
554 DEBUGP("entered %s\n", __FUNCTION__);
555
080774a2
HW		 556 memset(tuple, 0, sizeof(*tuple));
557
558 if (nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]) < 0)
559 goto nfattr_failure;
560
561 if (!tb[CTA_TUPLE_IP-1])
562 return -EINVAL;
563
564 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
565 if (err < 0)
566 return err;
567
568 if (!tb[CTA_TUPLE_PROTO-1])
569 return -EINVAL;
570
571 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
572 if (err < 0)
573 return err;
574
575 /* orig and expect tuples get DIR_ORIGINAL */
576 if (type == CTA_TUPLE_REPLY)
577 tuple->dst.dir = IP_CT_DIR_REPLY;
578 else
579 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
580
581 DUMP_TUPLE(tuple);
582
583 DEBUGP("leaving\n");
584
585 return 0;
586
587nfattr_failure:
588 return -1;
589}
590
591#ifdef CONFIG_IP_NF_NAT_NEEDED
592static const int cta_min_protonat[CTA_PROTONAT_MAX] = {
593 [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t),
594 [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t),
595};
596
597static int ctnetlink_parse_nat_proto(struct nfattr *attr,
598 const struct ip_conntrack *ct,
599 struct ip_nat_range *range)
600{
601 struct nfattr *tb[CTA_PROTONAT_MAX];
602 struct ip_nat_protocol *npt;
603
604 DEBUGP("entered %s\n", __FUNCTION__);
605
080774a2
HW		 606 if (nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr) < 0)
607 goto nfattr_failure;
608
609 if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
610 goto nfattr_failure;
611
612 npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
613 if (!npt)
614 return 0;
615
616 if (!npt->nfattr_to_range) {
617 ip_nat_proto_put(npt);
618 return 0;
619 }
620
621 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
622 if (npt->nfattr_to_range(tb, range) > 0)
623 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
624
625 ip_nat_proto_put(npt);
626
627 DEBUGP("leaving\n");
628 return 0;
629
630nfattr_failure:
631 return -1;
632}
633
634static inline int
635ctnetlink_parse_nat(struct nfattr *cda[],
636 const struct ip_conntrack *ct, struct ip_nat_range *range)
637{
638 struct nfattr *tb[CTA_NAT_MAX];
639 int err;
640
641 DEBUGP("entered %s\n", __FUNCTION__);
642
080774a2
HW		 643 memset(range, 0, sizeof(*range));
644
645 if (nfattr_parse_nested(tb, CTA_NAT_MAX, cda[CTA_NAT-1]) < 0)
646 goto nfattr_failure;
647
648 if (tb[CTA_NAT_MINIP-1])
649 range->min_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
650
651 if (!tb[CTA_NAT_MAXIP-1])
652 range->max_ip = range->min_ip;
653 else
654 range->max_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
655
656 if (range->min_ip)
657 range->flags |= IP_NAT_RANGE_MAP_IPS;
658
659 if (!tb[CTA_NAT_PROTO-1])
660 return 0;
661
662 err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
663 if (err < 0)
664 return err;
665
666 DEBUGP("leaving\n");
667 return 0;
668
669nfattr_failure:
670 return -1;
671}
672#endif
673
674static inline int
675ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
676{
677 struct nfattr *tb[CTA_HELP_MAX];
678
679 DEBUGP("entered %s\n", __FUNCTION__);
080774a2
HW		 680
681 if (nfattr_parse_nested(tb, CTA_HELP_MAX, attr) < 0)
682 goto nfattr_failure;
683
684 if (!tb[CTA_HELP_NAME-1])
685 return -EINVAL;
686
687 *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
688
689 return 0;
690
691nfattr_failure:
692 return -1;
693}
694
695static int
696ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
697 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
698{
699 struct ip_conntrack_tuple_hash *h;
700 struct ip_conntrack_tuple tuple;
701 struct ip_conntrack *ct;
702 int err = 0;
703
704 DEBUGP("entered %s\n", __FUNCTION__);
705
706 if (cda[CTA_TUPLE_ORIG-1])
707 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
708 else if (cda[CTA_TUPLE_REPLY-1])
709 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
710 else {
711 /* Flush the whole table */
712 ip_conntrack_flush();
713 return 0;
714 }
715
716 if (err < 0)
717 return err;
718
719 h = ip_conntrack_find_get(&tuple, NULL);
720 if (!h) {
721 DEBUGP("tuple not found in conntrack hash\n");
722 return -ENOENT;
723 }
724
725 ct = tuplehash_to_ctrack(h);
726
727 if (cda[CTA_ID-1]) {
728 u_int32_t id = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_ID-1]));
729 if (ct->id != id) {
730 ip_conntrack_put(ct);
731 return -ENOENT;
732 }
733 }
734 if (del_timer(&ct->timeout)) {
735 ip_conntrack_put(ct);
736 ct->timeout.function((unsigned long)ct);
737 return 0;
738 }
739 ip_conntrack_put(ct);
740 DEBUGP("leaving\n");
741
742 return 0;
743}
744
745static int
746ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
747 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
748{
749 struct ip_conntrack_tuple_hash *h;
750 struct ip_conntrack_tuple tuple;
751 struct ip_conntrack *ct;
752 struct sk_buff *skb2 = NULL;
753 int err = 0;
754
755 DEBUGP("entered %s\n", __FUNCTION__);
756
757 if (nlh->nlmsg_flags & NLM_F_DUMP) {
758 struct nfgenmsg *msg = NLMSG_DATA(nlh);
759 u32 rlen;
760
761 if (msg->nfgen_family != AF_INET)
762 return -EAFNOSUPPORT;
763
764 if (NFNL_MSG_TYPE(nlh->nlmsg_type) ==
765 IPCTNL_MSG_CT_GET_CTRZERO) {
766#ifdef CONFIG_IP_NF_CT_ACCT
767 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
768 ctnetlink_dump_table_w,
769 ctnetlink_done)) != 0)
770 return -EINVAL;
771#else
772 return -ENOTSUPP;
773#endif
774 } else {
775 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
776 ctnetlink_dump_table,
777 ctnetlink_done)) != 0)
778 return -EINVAL;
779 }
780
781 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
782 if (rlen > skb->len)
783 rlen = skb->len;
784 skb_pull(skb, rlen);
785 return 0;
786 }
787
788 if (cda[CTA_TUPLE_ORIG-1])
789 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
790 else if (cda[CTA_TUPLE_REPLY-1])
791 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
792 else
793 return -EINVAL;
794
795 if (err < 0)
796 return err;
797
798 h = ip_conntrack_find_get(&tuple, NULL);
799 if (!h) {
800 DEBUGP("tuple not found in conntrack hash");
801 return -ENOENT;
802 }
803 DEBUGP("tuple found\n");
804 ct = tuplehash_to_ctrack(h);
805
806 err = -ENOMEM;
807 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
808 if (!skb2) {
809 ip_conntrack_put(ct);
810 return -ENOMEM;
811 }
812 NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
813
814 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
815 IPCTNL_MSG_CT_NEW, 1, ct);
816 ip_conntrack_put(ct);
817 if (err <= 0)
818 goto out;
819
820 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
821 if (err < 0)
822 goto out;
823
824 DEBUGP("leaving\n");
825 return 0;
826
827out:
828 if (skb2)
829 kfree_skb(skb2);
830 return -1;
831}
832
833static inline int
834ctnetlink_change_status(struct ip_conntrack *ct, struct nfattr *cda[])
835{
836 unsigned long d, status = *(u_int32_t *)NFA_DATA(cda[CTA_STATUS-1]);
837 d = ct->status ^ status;
838
839 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
840 /* unchangeable */
841 return -EINVAL;
842
843 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
844 /* SEEN_REPLY bit can only be set */
845 return -EINVAL;
846
847
848 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
849 /* ASSURED bit can only be set */
850 return -EINVAL;
851
852 if (cda[CTA_NAT-1]) {
853#ifndef CONFIG_IP_NF_NAT_NEEDED
854 return -EINVAL;
855#else
856 unsigned int hooknum;
857 struct ip_nat_range range;
858
859 if (ctnetlink_parse_nat(cda, ct, &range) < 0)
860 return -EINVAL;
861
862 DEBUGP("NAT: %u.%u.%u.%u-%u.%u.%u.%u:%u-%u\n",
863 NIPQUAD(range.min_ip), NIPQUAD(range.max_ip),
864 htons(range.min.all), htons(range.max.all));
865
866 /* This is tricky but it works. ip_nat_setup_info needs the
867 * hook number as parameter, so let's do the correct
868 * conversion and run away */
869 if (status & IPS_SRC_NAT_DONE)
870 hooknum = NF_IP_POST_ROUTING; /* IP_NAT_MANIP_SRC */
871 else if (status & IPS_DST_NAT_DONE)
872 hooknum = NF_IP_PRE_ROUTING; /* IP_NAT_MANIP_DST */
873 else
874 return -EINVAL; /* Missing NAT flags */
875
876 DEBUGP("NAT status: %lu\n",
877 status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
878
879 if (ip_nat_initialized(ct, hooknum))
880 return -EEXIST;
881 ip_nat_setup_info(ct, &range, hooknum);
882
883 DEBUGP("NAT status after setup_info: %lu\n",
884 ct->status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
885#endif
886 }
887
888 /* Be careful here, modifying NAT bits can screw up things,
889 * so don't let users modify them directly if they don't pass
890 * ip_nat_range. */
891 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
892 return 0;
893}
894
895
896static inline int
897ctnetlink_change_helper(struct ip_conntrack *ct, struct nfattr *cda[])
898{
899 struct ip_conntrack_helper *helper;
900 char *helpname;
901 int err;
902
903 DEBUGP("entered %s\n", __FUNCTION__);
904
905 /* don't change helper of sibling connections */
906 if (ct->master)
907 return -EINVAL;
908
909 err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
910 if (err < 0)
911 return err;
912
913 helper = __ip_conntrack_helper_find_byname(helpname);
914 if (!helper) {
915 if (!strcmp(helpname, ""))
916 helper = NULL;
917 else
918 return -EINVAL;
919 }
920
921 if (ct->helper) {
922 if (!helper) {
923 /* we had a helper before ... */
924 ip_ct_remove_expectations(ct);
925 ct->helper = NULL;
926 } else {
927 /* need to zero data of old helper */
928 memset(&ct->help, 0, sizeof(ct->help));
929 }
930 }
931
932 ct->helper = helper;
933
934 return 0;
935}
936
937static inline int
938ctnetlink_change_timeout(struct ip_conntrack *ct, struct nfattr *cda[])
939{
940 u_int32_t timeout = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
941
942 if (!del_timer(&ct->timeout))
943 return -ETIME;
944
945 ct->timeout.expires = jiffies + timeout * HZ;
946 add_timer(&ct->timeout);
947
948 return 0;
949}
950
951static int
952ctnetlink_change_conntrack(struct ip_conntrack *ct, struct nfattr *cda[])
953{
954 int err;
955
956 DEBUGP("entered %s\n", __FUNCTION__);
957
958 if (cda[CTA_HELP-1]) {
959 err = ctnetlink_change_helper(ct, cda);
960 if (err < 0)
961 return err;
962 }
963
964 if (cda[CTA_TIMEOUT-1]) {
965 err = ctnetlink_change_timeout(ct, cda);
966 if (err < 0)
967 return err;
968 }
969
970 if (cda[CTA_STATUS-1]) {
971 err = ctnetlink_change_status(ct, cda);
972 if (err < 0)
973 return err;
974 }
975
976 DEBUGP("all done\n");
977 return 0;
978}
979
980static int
981ctnetlink_create_conntrack(struct nfattr *cda[],
982 struct ip_conntrack_tuple *otuple,
983 struct ip_conntrack_tuple *rtuple)
984{
985 struct ip_conntrack *ct;
986 int err = -EINVAL;
987
988 DEBUGP("entered %s\n", __FUNCTION__);
989
990 ct = ip_conntrack_alloc(otuple, rtuple);
991 if (ct == NULL || IS_ERR(ct))
992 return -ENOMEM;
993
994 if (!cda[CTA_TIMEOUT-1])
995 goto err;
996 ct->timeout.expires = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
997
998 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
999 ct->status |= IPS_CONFIRMED;
1000
1001 err = ctnetlink_change_status(ct, cda);
1002 if (err < 0)
1003 goto err;
1004
1005 ct->helper = ip_conntrack_helper_find_get(rtuple);
1006
1007 add_timer(&ct->timeout);
1008 ip_conntrack_hash_insert(ct);
1009
1010 if (ct->helper)
1011 ip_conntrack_helper_put(ct->helper);
1012
1013 DEBUGP("conntrack with id %u inserted\n", ct->id);
1014 return 0;
1015
1016err:
1017 ip_conntrack_free(ct);
1018 return err;
1019}
1020
1021static int
1022ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1023 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1024{
1025 struct ip_conntrack_tuple otuple, rtuple;
1026 struct ip_conntrack_tuple_hash *h = NULL;
1027 int err = 0;
1028
1029 DEBUGP("entered %s\n", __FUNCTION__);
1030
1031 if (cda[CTA_TUPLE_ORIG-1]) {
1032 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG);
1033 if (err < 0)
1034 return err;
1035 }
1036
1037 if (cda[CTA_TUPLE_REPLY-1]) {
1038 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY);
1039 if (err < 0)
1040 return err;
1041 }
1042
1043 write_lock_bh(&ip_conntrack_lock);
1044 if (cda[CTA_TUPLE_ORIG-1])
1045 h = __ip_conntrack_find(&otuple, NULL);
1046 else if (cda[CTA_TUPLE_REPLY-1])
1047 h = __ip_conntrack_find(&rtuple, NULL);
1048
1049 if (h == NULL) {
1050 write_unlock_bh(&ip_conntrack_lock);
1051 DEBUGP("no such conntrack, create new\n");
1052 err = -ENOENT;
1053 if (nlh->nlmsg_flags & NLM_F_CREATE)
1054 err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
88aa0429
PN		 1055 return err;
1056 }
1057 /* implicit 'else' */
1058
1059 /* we only allow nat config for new conntracks */
1060 if (cda[CTA_NAT-1]) {
1061 err = -EINVAL;
080774a2 1062 goto out_unlock;
080774a2
HW		 1063 }
1064
1065 /* We manipulate the conntrack inside the global conntrack table lock,
1066 * so there's no need to increase the refcount */
1067 DEBUGP("conntrack found\n");
1068 err = -EEXIST;
1069 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1070 err = ctnetlink_change_conntrack(tuplehash_to_ctrack(h), cda);
1071
1072out_unlock:
1073 write_unlock_bh(&ip_conntrack_lock);
1074 return err;
1075}
1076
1077/***********************************************************************
1078 * EXPECT
1079 ***********************************************************************/
1080
1081static inline int
1082ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1083 const struct ip_conntrack_tuple *tuple,
1084 enum ctattr_expect type)
1085{
1086 struct nfattr *nest_parms = NFA_NEST(skb, type);
1087
1088 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1089 goto nfattr_failure;
1090
1091 NFA_NEST_END(skb, nest_parms);
1092
1093 return 0;
1094
1095nfattr_failure:
1096 return -1;
1097}
1098
1099static inline int
1100ctnetlink_exp_dump_expect(struct sk_buff *skb,
1101 const struct ip_conntrack_expect *exp)
1102{
1444fc55 1103 struct ip_conntrack *master = exp->master;
080774a2
HW		 1104 u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1105 u_int32_t id = htonl(exp->id);
080774a2
HW		 1106
1107 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1108 goto nfattr_failure;
1109 if (ctnetlink_exp_dump_tuple(skb, &exp->mask, CTA_EXPECT_MASK) < 0)
1110 goto nfattr_failure;
1444fc55
HW		 1111 if (ctnetlink_exp_dump_tuple(skb,
1112 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1113 CTA_EXPECT_MASTER) < 0)
1114 goto nfattr_failure;
080774a2
HW		 1115
1116 NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1117 NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
080774a2
HW		 1118
1119 return 0;
1120
1121nfattr_failure:
1122 return -1;
1123}
1124
1125static int
1126ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1127 int event,
1128 int nowait,
1129 const struct ip_conntrack_expect *exp)
1130{
1131 struct nlmsghdr *nlh;
1132 struct nfgenmsg *nfmsg;
1133 unsigned char *b;
1134
1135 b = skb->tail;
1136
1137 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1138 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1139 nfmsg = NLMSG_DATA(nlh);
1140
1141 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1142 nfmsg->nfgen_family = AF_INET;
1143 nfmsg->version = NFNETLINK_V0;
1144 nfmsg->res_id = 0;
1145
1146 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1147 goto nfattr_failure;
1148
1149 nlh->nlmsg_len = skb->tail - b;
1150 return skb->len;
1151
1152nlmsg_failure:
1153nfattr_failure:
1154 skb_trim(skb, b - skb->data);
1155 return -1;
1156}
1157
1158#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1159static int ctnetlink_expect_event(struct notifier_block *this,
1160 unsigned long events, void *ptr)
1161{
1162 struct nlmsghdr *nlh;
1163 struct nfgenmsg *nfmsg;
1164 struct ip_conntrack_expect *exp = (struct ip_conntrack_expect *)ptr;
1165 struct sk_buff *skb;
1166 unsigned int type;
1167 unsigned char *b;
1168 int flags = 0;
1169 u16 proto;
1170
1171 if (events & IPEXP_NEW) {
1172 type = IPCTNL_MSG_EXP_NEW;
1173 flags = NLM_F_CREATE|NLM_F_EXCL;
1174 } else
1175 return NOTIFY_DONE;
1176
1177 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1178 if (!skb)
1179 return NOTIFY_DONE;
1180
1181 b = skb->tail;
1182
1183 type |= NFNL_SUBSYS_CTNETLINK << 8;
1184 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1185 nfmsg = NLMSG_DATA(nlh);
1186
1187 nlh->nlmsg_flags = flags;
1188 nfmsg->nfgen_family = AF_INET;
1189 nfmsg->version = NFNETLINK_V0;
1190 nfmsg->res_id = 0;
1191
1192 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1193 goto nfattr_failure;
1194
1195 nlh->nlmsg_len = skb->tail - b;
1196 proto = exp->tuple.dst.protonum;
ac6d439d 1197 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
080774a2
HW		 1198 return NOTIFY_DONE;
1199
1200nlmsg_failure:
1201nfattr_failure:
1202 kfree_skb(skb);
1203 return NOTIFY_DONE;
1204}
1205#endif
1206
1207static int
1208ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1209{
1210 struct ip_conntrack_expect *exp = NULL;
1211 struct list_head *i;
1212 u_int32_t *id = (u_int32_t *) &cb->args[0];
1213
1214 DEBUGP("entered %s, last id=%llu\n", __FUNCTION__, *id);
1215
1216 read_lock_bh(&ip_conntrack_lock);
ff21d577 1217 list_for_each_prev(i, &ip_conntrack_expect_list) {
080774a2
HW		 1218 exp = (struct ip_conntrack_expect *) i;
1219 if (exp->id <= *id)
1220 continue;
1221 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1222 cb->nlh->nlmsg_seq,
1223 IPCTNL_MSG_EXP_NEW,
1224 1, exp) < 0)
1225 goto out;
1226 *id = exp->id;
1227 }
1228out:
1229 read_unlock_bh(&ip_conntrack_lock);
1230
1231 DEBUGP("leaving, last id=%llu\n", *id);
1232
1233 return skb->len;
1234}
1235
1236static int
1237ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1238 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1239{
1240 struct ip_conntrack_tuple tuple;
1241 struct ip_conntrack_expect *exp;
1242 struct sk_buff *skb2;
1243 int err = 0;
1244
1245 DEBUGP("entered %s\n", __FUNCTION__);
1246
1247 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1248 struct nfgenmsg *msg = NLMSG_DATA(nlh);
1249 u32 rlen;
1250
1251 if (msg->nfgen_family != AF_INET)
1252 return -EAFNOSUPPORT;
1253
1254 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
1255 ctnetlink_exp_dump_table,
1256 ctnetlink_done)) != 0)
1257 return -EINVAL;
1258 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1259 if (rlen > skb->len)
1260 rlen = skb->len;
1261 skb_pull(skb, rlen);
1262 return 0;
1263 }
1264
1444fc55
HW		 1265 if (cda[CTA_EXPECT_MASTER-1])
1266 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER);
080774a2
HW		 1267 else
1268 return -EINVAL;
1269
1270 if (err < 0)
1271 return err;
1272
a41bc002 1273 exp = ip_conntrack_expect_find(&tuple);
080774a2
HW		 1274 if (!exp)
1275 return -ENOENT;
1276
1277 err = -ENOMEM;
1278 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1279 if (!skb2)
1280 goto out;
1281 NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
1282
1283 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1284 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1285 1, exp);
1286 if (err <= 0)
1287 goto out;
1288
1289 ip_conntrack_expect_put(exp);
1290
1291 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1292 if (err < 0)
1293 goto free;
1294
1295 return err;
1296
1297out:
1298 ip_conntrack_expect_put(exp);
1299free:
1300 if (skb2)
1301 kfree_skb(skb2);
1302 return err;
1303}
1304
1305static int
1306ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1307 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1308{
1309 struct ip_conntrack_expect *exp, *tmp;
1310 struct ip_conntrack_tuple tuple;
1311 struct ip_conntrack_helper *h;
1312 int err;
1313
1444fc55
HW		 1314 if (cda[CTA_EXPECT_TUPLE-1]) {
1315 /* delete a single expect by tuple */
1316 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1317 if (err < 0)
1318 return err;
1319
1320 /* bump usage count to 2 */
a41bc002 1321 exp = ip_conntrack_expect_find(&tuple);
1444fc55
HW		 1322 if (!exp)
1323 return -ENOENT;
1324
1325 if (cda[CTA_EXPECT_ID-1]) {
1326 u_int32_t id =
1327 *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1328 if (exp->id != ntohl(id)) {
1329 ip_conntrack_expect_put(exp);
1330 return -ENOENT;
1331 }
1332 }
1333
1334 /* after list removal, usage count == 1 */
1335 ip_conntrack_unexpect_related(exp);
1336 /* have to put what we 'get' above.
1337 * after this line usage count == 0 */
1338 ip_conntrack_expect_put(exp);
1339 } else if (cda[CTA_EXPECT_HELP_NAME-1]) {
1340 char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
080774a2
HW		 1341
1342 /* delete all expectations for this helper */
1343 write_lock_bh(&ip_conntrack_lock);
1344 h = __ip_conntrack_helper_find_byname(name);
1345 if (!h) {
1346 write_unlock_bh(&ip_conntrack_lock);
1347 return -EINVAL;
1348 }
1349 list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
1350 list) {
1351 if (exp->master->helper == h
49719eb3
PNA		 1352 && del_timer(&exp->timeout)) {
1353 ip_ct_unlink_expect(exp);
1354 ip_conntrack_expect_put(exp);
1355 }
080774a2
HW		 1356 }
1357 write_unlock(&ip_conntrack_lock);
080774a2
HW		 1358 } else {
1359 /* This basically means we have to flush everything*/
1360 write_lock_bh(&ip_conntrack_lock);
1361 list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
1362 list) {
49719eb3
PNA		 1363 if (del_timer(&exp->timeout)) {
1364 ip_ct_unlink_expect(exp);
1365 ip_conntrack_expect_put(exp);
1366 }
080774a2
HW		 1367 }
1368 write_unlock_bh(&ip_conntrack_lock);
080774a2
HW		 1369 }
1370
080774a2
HW		 1371 return 0;
1372}
1373static int
1374ctnetlink_change_expect(struct ip_conntrack_expect *x, struct nfattr *cda[])
1375{
1376 return -EOPNOTSUPP;
1377}
1378
1379static int
1380ctnetlink_create_expect(struct nfattr *cda[])
1381{
1382 struct ip_conntrack_tuple tuple, mask, master_tuple;
1383 struct ip_conntrack_tuple_hash *h = NULL;
1384 struct ip_conntrack_expect *exp;
1385 struct ip_conntrack *ct;
1386 int err = 0;
1387
1388 DEBUGP("entered %s\n", __FUNCTION__);
1389
1444fc55 1390 /* caller guarantees that those three CTA_EXPECT_* exist */
080774a2
HW		 1391 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1392 if (err < 0)
1393 return err;
bd9a26b7 1394 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK);
080774a2
HW		 1395 if (err < 0)
1396 return err;
1444fc55 1397 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER);
080774a2
HW		 1398 if (err < 0)
1399 return err;
1400
1401 /* Look for master conntrack of this expectation */
1402 h = ip_conntrack_find_get(&master_tuple, NULL);
1403 if (!h)
1404 return -ENOENT;
1405 ct = tuplehash_to_ctrack(h);
1406
1407 if (!ct->helper) {
1408 /* such conntrack hasn't got any helper, abort */
1409 err = -EINVAL;
1410 goto out;
1411 }
1412
1413 exp = ip_conntrack_expect_alloc(ct);
1414 if (!exp) {
1415 err = -ENOMEM;
1416 goto out;
1417 }
1418
1419 exp->expectfn = NULL;
2248bcfc 1420 exp->flags = 0;
080774a2
HW		 1421 exp->master = ct;
1422 memcpy(&exp->tuple, &tuple, sizeof(struct ip_conntrack_tuple));
1423 memcpy(&exp->mask, &mask, sizeof(struct ip_conntrack_tuple));
1424
1425 err = ip_conntrack_expect_related(exp);
1426 ip_conntrack_expect_put(exp);
1427
1428out:
1429 ip_conntrack_put(tuplehash_to_ctrack(h));
1430 return err;
1431}
1432
1433static int
1434ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1435 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1436{
1437 struct ip_conntrack_tuple tuple;
1438 struct ip_conntrack_expect *exp;
1439 int err = 0;
1440
1441 DEBUGP("entered %s\n", __FUNCTION__);
1442
1444fc55
HW		 1443 if (!cda[CTA_EXPECT_TUPLE-1]
1444 || !cda[CTA_EXPECT_MASK-1]
1445 || !cda[CTA_EXPECT_MASTER-1])
080774a2
HW		 1446 return -EINVAL;
1447
1448 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1449 if (err < 0)
1450 return err;
1451
1452 write_lock_bh(&ip_conntrack_lock);
1453 exp = __ip_conntrack_expect_find(&tuple);
1454
1455 if (!exp) {
1456 write_unlock_bh(&ip_conntrack_lock);
1457 err = -ENOENT;
1458 if (nlh->nlmsg_flags & NLM_F_CREATE)
1459 err = ctnetlink_create_expect(cda);
1460 return err;
1461 }
1462
1463 err = -EEXIST;
1464 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1465 err = ctnetlink_change_expect(exp, cda);
1466 write_unlock_bh(&ip_conntrack_lock);
1467
1468 DEBUGP("leaving\n");
1469
1470 return err;
1471}
1472
1473#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1474static struct notifier_block ctnl_notifier = {
1475 .notifier_call = ctnetlink_conntrack_event,
1476};
1477
1478static struct notifier_block ctnl_notifier_exp = {
1479 .notifier_call = ctnetlink_expect_event,
1480};
1481#endif
1482
1483static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1484 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
927ccbcc 1485 .attr_count = CTA_MAX,
080774a2
HW		 1486 .cap_required = CAP_NET_ADMIN },
1487 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
927ccbcc 1488 .attr_count = CTA_MAX,
080774a2
HW		 1489 .cap_required = CAP_NET_ADMIN },
1490 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
927ccbcc 1491 .attr_count = CTA_MAX,
080774a2
HW		 1492 .cap_required = CAP_NET_ADMIN },
1493 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
927ccbcc 1494 .attr_count = CTA_MAX,
080774a2
HW		 1495 .cap_required = CAP_NET_ADMIN },
1496};
1497
28b19d99 1498static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
080774a2 1499 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
927ccbcc 1500 .attr_count = CTA_EXPECT_MAX,
080774a2
HW		 1501 .cap_required = CAP_NET_ADMIN },
1502 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
927ccbcc 1503 .attr_count = CTA_EXPECT_MAX,
080774a2
HW		 1504 .cap_required = CAP_NET_ADMIN },
1505 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
927ccbcc 1506 .attr_count = CTA_EXPECT_MAX,
080774a2
HW		 1507 .cap_required = CAP_NET_ADMIN },
1508};
1509
1510static struct nfnetlink_subsystem ctnl_subsys = {
1511 .name = "conntrack",
1512 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1513 .cb_count = IPCTNL_MSG_MAX,
080774a2
HW		 1514 .cb = ctnl_cb,
1515};
1516
1517static struct nfnetlink_subsystem ctnl_exp_subsys = {
1518 .name = "conntrack_expect",
1519 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1520 .cb_count = IPCTNL_MSG_EXP_MAX,
080774a2
HW		 1521 .cb = ctnl_exp_cb,
1522};
1523
1524static int __init ctnetlink_init(void)
1525{
1526 int ret;
1527
1528 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1529 ret = nfnetlink_subsys_register(&ctnl_subsys);
1530 if (ret < 0) {
1531 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1532 goto err_out;
1533 }
1534
1535 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1536 if (ret < 0) {
1537 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1538 goto err_unreg_subsys;
1539 }
1540
1541#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1542 ret = ip_conntrack_register_notifier(&ctnl_notifier);
1543 if (ret < 0) {
1544 printk("ctnetlink_init: cannot register notifier.\n");
1545 goto err_unreg_exp_subsys;
1546 }
1547
1548 ret = ip_conntrack_expect_register_notifier(&ctnl_notifier_exp);
1549 if (ret < 0) {
1550 printk("ctnetlink_init: cannot expect register notifier.\n");
1551 goto err_unreg_notifier;
1552 }
1553#endif
1554
1555 return 0;
1556
1557#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1558err_unreg_notifier:
1559 ip_conntrack_unregister_notifier(&ctnl_notifier);
1560err_unreg_exp_subsys:
1561 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1562#endif
1563err_unreg_subsys:
1564 nfnetlink_subsys_unregister(&ctnl_subsys);
1565err_out:
1566 return ret;
1567}
1568
1569static void __exit ctnetlink_exit(void)
1570{
1571 printk("ctnetlink: unregistering from nfnetlink.\n");
1572
1573#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1574 ip_conntrack_unregister_notifier(&ctnl_notifier_exp);
1575 ip_conntrack_unregister_notifier(&ctnl_notifier);
1576#endif
1577
1578 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1579 nfnetlink_subsys_unregister(&ctnl_subsys);
1580 return;
1581}
1582
1583module_init(ctnetlink_init);
1584module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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