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[NETFILTER] ctnetlink: propagate error instaed of returning -EPERM
[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>
080774a2
HW		 31
32#include <linux/netfilter.h>
080774a2
HW		 33#include <linux/netfilter_ipv4/ip_conntrack.h>
34#include <linux/netfilter_ipv4/ip_conntrack_core.h>
35#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
36#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
37#include <linux/netfilter_ipv4/ip_nat_protocol.h>
38
39#include <linux/netfilter/nfnetlink.h>
40#include <linux/netfilter/nfnetlink_conntrack.h>
41
42MODULE_LICENSE("GPL");
43
44static char __initdata version[] = "0.90";
45
46#if 0
47#define DEBUGP printk
48#else
49#define DEBUGP(format, args...)
50#endif
51
52
53static inline int
54ctnetlink_dump_tuples_proto(struct sk_buff *skb,
55 const struct ip_conntrack_tuple *tuple)
56{
57 struct ip_conntrack_protocol *proto;
eaae4fa4 58 int ret = 0;
080774a2
HW		 59
60 NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
61
62 proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
eaae4fa4
YK		 63 if (likely(proto && proto->tuple_to_nfattr)) {
64 ret = proto->tuple_to_nfattr(skb, tuple);
65 ip_conntrack_proto_put(proto);
66 }
080774a2 67
eaae4fa4 68 return ret;
080774a2
HW		 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);
46998f59 178 u_int32_t tmp;
080774a2 179
a051a8f7
HW		 180 tmp = htonl(ct->counters[dir].packets);
181 NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
080774a2 182
a051a8f7
HW		 183 tmp = htonl(ct->counters[dir].bytes);
184 NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
080774a2
HW		 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
a2506c04 482 nfattr_parse_nested(tb, CTA_IP_MAX, attr);
080774a2
HW		 483
484 if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip))
485 return -EINVAL;
486
487 if (!tb[CTA_IP_V4_SRC-1])
488 return -EINVAL;
489 tuple->src.ip = *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_SRC-1]);
490
491 if (!tb[CTA_IP_V4_DST-1])
492 return -EINVAL;
493 tuple->dst.ip = *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_DST-1]);
494
495 DEBUGP("leaving\n");
496
497 return 0;
080774a2
HW		 498}
499
500static const int cta_min_proto[CTA_PROTO_MAX] = {
501 [CTA_PROTO_NUM-1] = sizeof(u_int16_t),
502 [CTA_PROTO_SRC_PORT-1] = sizeof(u_int16_t),
503 [CTA_PROTO_DST_PORT-1] = sizeof(u_int16_t),
504 [CTA_PROTO_ICMP_TYPE-1] = sizeof(u_int8_t),
505 [CTA_PROTO_ICMP_CODE-1] = sizeof(u_int8_t),
506 [CTA_PROTO_ICMP_ID-1] = sizeof(u_int16_t),
507};
508
509static inline int
510ctnetlink_parse_tuple_proto(struct nfattr *attr,
511 struct ip_conntrack_tuple *tuple)
512{
513 struct nfattr *tb[CTA_PROTO_MAX];
514 struct ip_conntrack_protocol *proto;
515 int ret = 0;
516
517 DEBUGP("entered %s\n", __FUNCTION__);
518
a2506c04 519 nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
080774a2
HW		 520
521 if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
522 return -EINVAL;
523
524 if (!tb[CTA_PROTO_NUM-1])
525 return -EINVAL;
526 tuple->dst.protonum = *(u_int16_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
527
528 proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
529
530 if (likely(proto && proto->nfattr_to_tuple)) {
531 ret = proto->nfattr_to_tuple(tb, tuple);
532 ip_conntrack_proto_put(proto);
533 }
534
535 return ret;
080774a2
HW		 536}
537
538static inline int
539ctnetlink_parse_tuple(struct nfattr *cda[], struct ip_conntrack_tuple *tuple,
540 enum ctattr_tuple type)
541{
542 struct nfattr *tb[CTA_TUPLE_MAX];
543 int err;
544
545 DEBUGP("entered %s\n", __FUNCTION__);
546
080774a2
HW		 547 memset(tuple, 0, sizeof(*tuple));
548
a2506c04 549 nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
080774a2
HW		 550
551 if (!tb[CTA_TUPLE_IP-1])
552 return -EINVAL;
553
554 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
555 if (err < 0)
556 return err;
557
558 if (!tb[CTA_TUPLE_PROTO-1])
559 return -EINVAL;
560
561 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
562 if (err < 0)
563 return err;
564
565 /* orig and expect tuples get DIR_ORIGINAL */
566 if (type == CTA_TUPLE_REPLY)
567 tuple->dst.dir = IP_CT_DIR_REPLY;
568 else
569 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
570
571 DUMP_TUPLE(tuple);
572
573 DEBUGP("leaving\n");
574
575 return 0;
080774a2
HW		 576}
577
578#ifdef CONFIG_IP_NF_NAT_NEEDED
579static const int cta_min_protonat[CTA_PROTONAT_MAX] = {
580 [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t),
581 [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t),
582};
583
584static int ctnetlink_parse_nat_proto(struct nfattr *attr,
585 const struct ip_conntrack *ct,
586 struct ip_nat_range *range)
587{
588 struct nfattr *tb[CTA_PROTONAT_MAX];
589 struct ip_nat_protocol *npt;
590
591 DEBUGP("entered %s\n", __FUNCTION__);
592
a2506c04 593 nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
080774a2
HW		 594
595 if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
fe902a91 596 return -EINVAL;
080774a2
HW		 597
598 npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
599 if (!npt)
600 return 0;
601
602 if (!npt->nfattr_to_range) {
603 ip_nat_proto_put(npt);
604 return 0;
605 }
606
607 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
608 if (npt->nfattr_to_range(tb, range) > 0)
609 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
610
611 ip_nat_proto_put(npt);
612
613 DEBUGP("leaving\n");
614 return 0;
080774a2
HW		 615}
616
617static inline int
618ctnetlink_parse_nat(struct nfattr *cda[],
619 const struct ip_conntrack *ct, struct ip_nat_range *range)
620{
621 struct nfattr *tb[CTA_NAT_MAX];
622 int err;
623
624 DEBUGP("entered %s\n", __FUNCTION__);
625
080774a2
HW		 626 memset(range, 0, sizeof(*range));
627
a2506c04 628 nfattr_parse_nested(tb, CTA_NAT_MAX, cda[CTA_NAT-1]);
080774a2
HW		 629
630 if (tb[CTA_NAT_MINIP-1])
631 range->min_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
632
633 if (!tb[CTA_NAT_MAXIP-1])
634 range->max_ip = range->min_ip;
635 else
636 range->max_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
637
638 if (range->min_ip)
639 range->flags |= IP_NAT_RANGE_MAP_IPS;
640
641 if (!tb[CTA_NAT_PROTO-1])
642 return 0;
643
644 err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
645 if (err < 0)
646 return err;
647
648 DEBUGP("leaving\n");
649 return 0;
080774a2
HW		 650}
651#endif
652
653static inline int
654ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
655{
656 struct nfattr *tb[CTA_HELP_MAX];
657
658 DEBUGP("entered %s\n", __FUNCTION__);
080774a2 659
a2506c04 660 nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
080774a2
HW		 661
662 if (!tb[CTA_HELP_NAME-1])
663 return -EINVAL;
664
665 *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
666
667 return 0;
080774a2
HW		 668}
669
670static int
671ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
672 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
673{
674 struct ip_conntrack_tuple_hash *h;
675 struct ip_conntrack_tuple tuple;
676 struct ip_conntrack *ct;
677 int err = 0;
678
679 DEBUGP("entered %s\n", __FUNCTION__);
680
681 if (cda[CTA_TUPLE_ORIG-1])
682 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
683 else if (cda[CTA_TUPLE_REPLY-1])
684 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
685 else {
686 /* Flush the whole table */
687 ip_conntrack_flush();
688 return 0;
689 }
690
691 if (err < 0)
692 return err;
693
694 h = ip_conntrack_find_get(&tuple, NULL);
695 if (!h) {
696 DEBUGP("tuple not found in conntrack hash\n");
697 return -ENOENT;
698 }
699
700 ct = tuplehash_to_ctrack(h);
701
702 if (cda[CTA_ID-1]) {
703 u_int32_t id = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_ID-1]));
704 if (ct->id != id) {
705 ip_conntrack_put(ct);
706 return -ENOENT;
707 }
708 }
709 if (del_timer(&ct->timeout)) {
710 ip_conntrack_put(ct);
711 ct->timeout.function((unsigned long)ct);
712 return 0;
713 }
714 ip_conntrack_put(ct);
715 DEBUGP("leaving\n");
716
717 return 0;
718}
719
720static int
721ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
722 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
723{
724 struct ip_conntrack_tuple_hash *h;
725 struct ip_conntrack_tuple tuple;
726 struct ip_conntrack *ct;
727 struct sk_buff *skb2 = NULL;
728 int err = 0;
729
730 DEBUGP("entered %s\n", __FUNCTION__);
731
732 if (nlh->nlmsg_flags & NLM_F_DUMP) {
733 struct nfgenmsg *msg = NLMSG_DATA(nlh);
734 u32 rlen;
735
736 if (msg->nfgen_family != AF_INET)
737 return -EAFNOSUPPORT;
738
739 if (NFNL_MSG_TYPE(nlh->nlmsg_type) ==
740 IPCTNL_MSG_CT_GET_CTRZERO) {
741#ifdef CONFIG_IP_NF_CT_ACCT
742 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
743 ctnetlink_dump_table_w,
744 ctnetlink_done)) != 0)
745 return -EINVAL;
746#else
747 return -ENOTSUPP;
748#endif
749 } else {
750 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
751 ctnetlink_dump_table,
752 ctnetlink_done)) != 0)
753 return -EINVAL;
754 }
755
756 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
757 if (rlen > skb->len)
758 rlen = skb->len;
759 skb_pull(skb, rlen);
760 return 0;
761 }
762
763 if (cda[CTA_TUPLE_ORIG-1])
764 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
765 else if (cda[CTA_TUPLE_REPLY-1])
766 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
767 else
768 return -EINVAL;
769
770 if (err < 0)
771 return err;
772
773 h = ip_conntrack_find_get(&tuple, NULL);
774 if (!h) {
775 DEBUGP("tuple not found in conntrack hash");
776 return -ENOENT;
777 }
778 DEBUGP("tuple found\n");
779 ct = tuplehash_to_ctrack(h);
780
781 err = -ENOMEM;
81e5c27d 782 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
080774a2
HW		 783 if (!skb2) {
784 ip_conntrack_put(ct);
785 return -ENOMEM;
786 }
787 NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
788
789 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
790 IPCTNL_MSG_CT_NEW, 1, ct);
791 ip_conntrack_put(ct);
792 if (err <= 0)
0f81eb4d 793 goto free;
080774a2
HW		 794
795 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
796 if (err < 0)
797 goto out;
798
799 DEBUGP("leaving\n");
800 return 0;
801
0f81eb4d
HW		 802free:
803 kfree_skb(skb2);
080774a2 804out:
fcda4612 805 return err;
080774a2
HW		 806}
807
808static inline int
809ctnetlink_change_status(struct ip_conntrack *ct, struct nfattr *cda[])
810{
d000eaf7
HW		 811 unsigned long d;
812 unsigned status = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_STATUS-1]));
080774a2
HW		 813 d = ct->status ^ status;
814
815 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
816 /* unchangeable */
817 return -EINVAL;
818
819 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
820 /* SEEN_REPLY bit can only be set */
821 return -EINVAL;
822
823
824 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
825 /* ASSURED bit can only be set */
826 return -EINVAL;
827
828 if (cda[CTA_NAT-1]) {
829#ifndef CONFIG_IP_NF_NAT_NEEDED
830 return -EINVAL;
831#else
832 unsigned int hooknum;
833 struct ip_nat_range range;
834
835 if (ctnetlink_parse_nat(cda, ct, &range) < 0)
836 return -EINVAL;
837
838 DEBUGP("NAT: %u.%u.%u.%u-%u.%u.%u.%u:%u-%u\n",
839 NIPQUAD(range.min_ip), NIPQUAD(range.max_ip),
840 htons(range.min.all), htons(range.max.all));
841
842 /* This is tricky but it works. ip_nat_setup_info needs the
843 * hook number as parameter, so let's do the correct
844 * conversion and run away */
845 if (status & IPS_SRC_NAT_DONE)
846 hooknum = NF_IP_POST_ROUTING; /* IP_NAT_MANIP_SRC */
847 else if (status & IPS_DST_NAT_DONE)
848 hooknum = NF_IP_PRE_ROUTING; /* IP_NAT_MANIP_DST */
849 else
850 return -EINVAL; /* Missing NAT flags */
851
852 DEBUGP("NAT status: %lu\n",
853 status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
854
855 if (ip_nat_initialized(ct, hooknum))
856 return -EEXIST;
857 ip_nat_setup_info(ct, &range, hooknum);
858
859 DEBUGP("NAT status after setup_info: %lu\n",
860 ct->status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
861#endif
862 }
863
864 /* Be careful here, modifying NAT bits can screw up things,
865 * so don't let users modify them directly if they don't pass
866 * ip_nat_range. */
867 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
868 return 0;
869}
870
871
872static inline int
873ctnetlink_change_helper(struct ip_conntrack *ct, struct nfattr *cda[])
874{
875 struct ip_conntrack_helper *helper;
876 char *helpname;
877 int err;
878
879 DEBUGP("entered %s\n", __FUNCTION__);
880
881 /* don't change helper of sibling connections */
882 if (ct->master)
883 return -EINVAL;
884
885 err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
886 if (err < 0)
887 return err;
888
889 helper = __ip_conntrack_helper_find_byname(helpname);
890 if (!helper) {
891 if (!strcmp(helpname, ""))
892 helper = NULL;
893 else
894 return -EINVAL;
895 }
896
897 if (ct->helper) {
898 if (!helper) {
899 /* we had a helper before ... */
900 ip_ct_remove_expectations(ct);
901 ct->helper = NULL;
902 } else {
903 /* need to zero data of old helper */
904 memset(&ct->help, 0, sizeof(ct->help));
905 }
906 }
907
908 ct->helper = helper;
909
910 return 0;
911}
912
913static inline int
914ctnetlink_change_timeout(struct ip_conntrack *ct, struct nfattr *cda[])
915{
916 u_int32_t timeout = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
917
918 if (!del_timer(&ct->timeout))
919 return -ETIME;
920
921 ct->timeout.expires = jiffies + timeout * HZ;
922 add_timer(&ct->timeout);
923
924 return 0;
925}
926
061cb4a0
PNA		 927static inline int
928ctnetlink_change_protoinfo(struct ip_conntrack *ct, struct nfattr *cda[])
929{
930 struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
931 struct ip_conntrack_protocol *proto;
932 u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
933 int err = 0;
934
a2506c04 935 nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
061cb4a0
PNA		 936
937 proto = ip_conntrack_proto_find_get(npt);
938 if (!proto)
939 return -EINVAL;
940
941 if (proto->from_nfattr)
942 err = proto->from_nfattr(tb, ct);
943 ip_conntrack_proto_put(proto);
944
945 return err;
061cb4a0
PNA		 946}
947
080774a2
HW		 948static int
949ctnetlink_change_conntrack(struct ip_conntrack *ct, struct nfattr *cda[])
950{
951 int err;
952
953 DEBUGP("entered %s\n", __FUNCTION__);
954
955 if (cda[CTA_HELP-1]) {
956 err = ctnetlink_change_helper(ct, cda);
957 if (err < 0)
958 return err;
959 }
960
961 if (cda[CTA_TIMEOUT-1]) {
962 err = ctnetlink_change_timeout(ct, cda);
963 if (err < 0)
964 return err;
965 }
966
967 if (cda[CTA_STATUS-1]) {
968 err = ctnetlink_change_status(ct, cda);
969 if (err < 0)
970 return err;
971 }
972
061cb4a0
PNA		 973 if (cda[CTA_PROTOINFO-1]) {
974 err = ctnetlink_change_protoinfo(ct, cda);
975 if (err < 0)
976 return err;
977 }
978
02a78cdf
PNA		 979#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
980 if (cda[CTA_MARK-1])
981 ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
982#endif
983
080774a2
HW		 984 DEBUGP("all done\n");
985 return 0;
986}
987
988static int
989ctnetlink_create_conntrack(struct nfattr *cda[],
990 struct ip_conntrack_tuple *otuple,
991 struct ip_conntrack_tuple *rtuple)
992{
993 struct ip_conntrack *ct;
994 int err = -EINVAL;
995
996 DEBUGP("entered %s\n", __FUNCTION__);
997
998 ct = ip_conntrack_alloc(otuple, rtuple);
999 if (ct == NULL || IS_ERR(ct))
1000 return -ENOMEM;
1001
1002 if (!cda[CTA_TIMEOUT-1])
1003 goto err;
1004 ct->timeout.expires = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
1005
1006 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1007 ct->status |= IPS_CONFIRMED;
1008
1009 err = ctnetlink_change_status(ct, cda);
1010 if (err < 0)
1011 goto err;
1012
061cb4a0
PNA		 1013 if (cda[CTA_PROTOINFO-1]) {
1014 err = ctnetlink_change_protoinfo(ct, cda);
1015 if (err < 0)
1016 return err;
1017 }
1018
080774a2
HW		 1019 ct->helper = ip_conntrack_helper_find_get(rtuple);
1020
1021 add_timer(&ct->timeout);
1022 ip_conntrack_hash_insert(ct);
1023
1024 if (ct->helper)
1025 ip_conntrack_helper_put(ct->helper);
1026
02a78cdf
PNA		 1027#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
1028 if (cda[CTA_MARK-1])
1029 ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
1030#endif
1031
080774a2
HW		 1032 DEBUGP("conntrack with id %u inserted\n", ct->id);
1033 return 0;
1034
1035err:
1036 ip_conntrack_free(ct);
1037 return err;
1038}
1039
1040static int
1041ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1042 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1043{
1044 struct ip_conntrack_tuple otuple, rtuple;
1045 struct ip_conntrack_tuple_hash *h = NULL;
1046 int err = 0;
1047
1048 DEBUGP("entered %s\n", __FUNCTION__);
1049
1050 if (cda[CTA_TUPLE_ORIG-1]) {
1051 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG);
1052 if (err < 0)
1053 return err;
1054 }
1055
1056 if (cda[CTA_TUPLE_REPLY-1]) {
1057 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY);
1058 if (err < 0)
1059 return err;
1060 }
1061
1062 write_lock_bh(&ip_conntrack_lock);
1063 if (cda[CTA_TUPLE_ORIG-1])
1064 h = __ip_conntrack_find(&otuple, NULL);
1065 else if (cda[CTA_TUPLE_REPLY-1])
1066 h = __ip_conntrack_find(&rtuple, NULL);
1067
1068 if (h == NULL) {
1069 write_unlock_bh(&ip_conntrack_lock);
1070 DEBUGP("no such conntrack, create new\n");
1071 err = -ENOENT;
1072 if (nlh->nlmsg_flags & NLM_F_CREATE)
1073 err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
88aa0429
PN		 1074 return err;
1075 }
1076 /* implicit 'else' */
1077
1078 /* we only allow nat config for new conntracks */
1079 if (cda[CTA_NAT-1]) {
1080 err = -EINVAL;
080774a2 1081 goto out_unlock;
080774a2
HW		 1082 }
1083
1084 /* We manipulate the conntrack inside the global conntrack table lock,
1085 * so there's no need to increase the refcount */
1086 DEBUGP("conntrack found\n");
1087 err = -EEXIST;
1088 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1089 err = ctnetlink_change_conntrack(tuplehash_to_ctrack(h), cda);
1090
1091out_unlock:
1092 write_unlock_bh(&ip_conntrack_lock);
1093 return err;
1094}
1095
1096/***********************************************************************
1097 * EXPECT
1098 ***********************************************************************/
1099
1100static inline int
1101ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1102 const struct ip_conntrack_tuple *tuple,
1103 enum ctattr_expect type)
1104{
1105 struct nfattr *nest_parms = NFA_NEST(skb, type);
1106
1107 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1108 goto nfattr_failure;
1109
1110 NFA_NEST_END(skb, nest_parms);
1111
1112 return 0;
1113
1114nfattr_failure:
1115 return -1;
1116}
1117
1118static inline int
1119ctnetlink_exp_dump_expect(struct sk_buff *skb,
1120 const struct ip_conntrack_expect *exp)
1121{
1444fc55 1122 struct ip_conntrack *master = exp->master;
080774a2
HW		 1123 u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1124 u_int32_t id = htonl(exp->id);
080774a2
HW		 1125
1126 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1127 goto nfattr_failure;
1128 if (ctnetlink_exp_dump_tuple(skb, &exp->mask, CTA_EXPECT_MASK) < 0)
1129 goto nfattr_failure;
1444fc55
HW		 1130 if (ctnetlink_exp_dump_tuple(skb,
1131 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1132 CTA_EXPECT_MASTER) < 0)
1133 goto nfattr_failure;
080774a2
HW		 1134
1135 NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1136 NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
080774a2
HW		 1137
1138 return 0;
1139
1140nfattr_failure:
1141 return -1;
1142}
1143
1144static int
1145ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1146 int event,
1147 int nowait,
1148 const struct ip_conntrack_expect *exp)
1149{
1150 struct nlmsghdr *nlh;
1151 struct nfgenmsg *nfmsg;
1152 unsigned char *b;
1153
1154 b = skb->tail;
1155
1156 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1157 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1158 nfmsg = NLMSG_DATA(nlh);
1159
1160 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1161 nfmsg->nfgen_family = AF_INET;
1162 nfmsg->version = NFNETLINK_V0;
1163 nfmsg->res_id = 0;
1164
1165 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1166 goto nfattr_failure;
1167
1168 nlh->nlmsg_len = skb->tail - b;
1169 return skb->len;
1170
1171nlmsg_failure:
1172nfattr_failure:
1173 skb_trim(skb, b - skb->data);
1174 return -1;
1175}
1176
1177#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1178static int ctnetlink_expect_event(struct notifier_block *this,
1179 unsigned long events, void *ptr)
1180{
1181 struct nlmsghdr *nlh;
1182 struct nfgenmsg *nfmsg;
1183 struct ip_conntrack_expect *exp = (struct ip_conntrack_expect *)ptr;
1184 struct sk_buff *skb;
1185 unsigned int type;
1186 unsigned char *b;
1187 int flags = 0;
1188 u16 proto;
1189
1190 if (events & IPEXP_NEW) {
1191 type = IPCTNL_MSG_EXP_NEW;
1192 flags = NLM_F_CREATE|NLM_F_EXCL;
1193 } else
1194 return NOTIFY_DONE;
1195
1196 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1197 if (!skb)
1198 return NOTIFY_DONE;
1199
1200 b = skb->tail;
1201
1202 type |= NFNL_SUBSYS_CTNETLINK << 8;
1203 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1204 nfmsg = NLMSG_DATA(nlh);
1205
1206 nlh->nlmsg_flags = flags;
1207 nfmsg->nfgen_family = AF_INET;
1208 nfmsg->version = NFNETLINK_V0;
1209 nfmsg->res_id = 0;
1210
1211 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1212 goto nfattr_failure;
1213
1214 nlh->nlmsg_len = skb->tail - b;
1215 proto = exp->tuple.dst.protonum;
ac6d439d 1216 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
080774a2
HW		 1217 return NOTIFY_DONE;
1218
1219nlmsg_failure:
1220nfattr_failure:
1221 kfree_skb(skb);
1222 return NOTIFY_DONE;
1223}
1224#endif
1225
1226static int
1227ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1228{
1229 struct ip_conntrack_expect *exp = NULL;
1230 struct list_head *i;
1231 u_int32_t *id = (u_int32_t *) &cb->args[0];
1232
1233 DEBUGP("entered %s, last id=%llu\n", __FUNCTION__, *id);
1234
1235 read_lock_bh(&ip_conntrack_lock);
ff21d577 1236 list_for_each_prev(i, &ip_conntrack_expect_list) {
080774a2
HW		 1237 exp = (struct ip_conntrack_expect *) i;
1238 if (exp->id <= *id)
1239 continue;
1240 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1241 cb->nlh->nlmsg_seq,
1242 IPCTNL_MSG_EXP_NEW,
1243 1, exp) < 0)
1244 goto out;
1245 *id = exp->id;
1246 }
1247out:
1248 read_unlock_bh(&ip_conntrack_lock);
1249
1250 DEBUGP("leaving, last id=%llu\n", *id);
1251
1252 return skb->len;
1253}
1254
1255static int
1256ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1257 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1258{
1259 struct ip_conntrack_tuple tuple;
1260 struct ip_conntrack_expect *exp;
1261 struct sk_buff *skb2;
1262 int err = 0;
1263
1264 DEBUGP("entered %s\n", __FUNCTION__);
1265
1266 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1267 struct nfgenmsg *msg = NLMSG_DATA(nlh);
1268 u32 rlen;
1269
1270 if (msg->nfgen_family != AF_INET)
1271 return -EAFNOSUPPORT;
1272
1273 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
1274 ctnetlink_exp_dump_table,
1275 ctnetlink_done)) != 0)
1276 return -EINVAL;
1277 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1278 if (rlen > skb->len)
1279 rlen = skb->len;
1280 skb_pull(skb, rlen);
1281 return 0;
1282 }
1283
1444fc55
HW		 1284 if (cda[CTA_EXPECT_MASTER-1])
1285 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER);
080774a2
HW		 1286 else
1287 return -EINVAL;
1288
1289 if (err < 0)
1290 return err;
1291
a41bc002 1292 exp = ip_conntrack_expect_find(&tuple);
080774a2
HW		 1293 if (!exp)
1294 return -ENOENT;
1295
1296 err = -ENOMEM;
1297 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1298 if (!skb2)
1299 goto out;
1300 NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
1301
1302 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1303 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1304 1, exp);
1305 if (err <= 0)
0f81eb4d 1306 goto free;
080774a2
HW		 1307
1308 ip_conntrack_expect_put(exp);
1309
0f81eb4d 1310 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
080774a2 1311
0f81eb4d
HW		 1312free:
1313 kfree_skb(skb2);
080774a2
HW		 1314out:
1315 ip_conntrack_expect_put(exp);
080774a2
HW		 1316 return err;
1317}
1318
1319static int
1320ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1321 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1322{
1323 struct ip_conntrack_expect *exp, *tmp;
1324 struct ip_conntrack_tuple tuple;
1325 struct ip_conntrack_helper *h;
1326 int err;
1327
1444fc55
HW		 1328 if (cda[CTA_EXPECT_TUPLE-1]) {
1329 /* delete a single expect by tuple */
1330 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1331 if (err < 0)
1332 return err;
1333
1334 /* bump usage count to 2 */
a41bc002 1335 exp = ip_conntrack_expect_find(&tuple);
1444fc55
HW		 1336 if (!exp)
1337 return -ENOENT;
1338
1339 if (cda[CTA_EXPECT_ID-1]) {
1340 u_int32_t id =
1341 *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1342 if (exp->id != ntohl(id)) {
1343 ip_conntrack_expect_put(exp);
1344 return -ENOENT;
1345 }
1346 }
1347
1348 /* after list removal, usage count == 1 */
1349 ip_conntrack_unexpect_related(exp);
1350 /* have to put what we 'get' above.
1351 * after this line usage count == 0 */
1352 ip_conntrack_expect_put(exp);
1353 } else if (cda[CTA_EXPECT_HELP_NAME-1]) {
1354 char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
080774a2
HW		 1355
1356 /* delete all expectations for this helper */
1357 write_lock_bh(&ip_conntrack_lock);
1358 h = __ip_conntrack_helper_find_byname(name);
1359 if (!h) {
1360 write_unlock_bh(&ip_conntrack_lock);
1361 return -EINVAL;
1362 }
1363 list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
1364 list) {
1365 if (exp->master->helper == h
49719eb3
PNA		 1366 && del_timer(&exp->timeout)) {
1367 ip_ct_unlink_expect(exp);
1368 ip_conntrack_expect_put(exp);
1369 }
080774a2
HW		 1370 }
1371 write_unlock(&ip_conntrack_lock);
080774a2
HW		 1372 } else {
1373 /* This basically means we have to flush everything*/
1374 write_lock_bh(&ip_conntrack_lock);
1375 list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
1376 list) {
49719eb3
PNA		 1377 if (del_timer(&exp->timeout)) {
1378 ip_ct_unlink_expect(exp);
1379 ip_conntrack_expect_put(exp);
1380 }
080774a2
HW		 1381 }
1382 write_unlock_bh(&ip_conntrack_lock);
080774a2
HW		 1383 }
1384
080774a2
HW		 1385 return 0;
1386}
1387static int
1388ctnetlink_change_expect(struct ip_conntrack_expect *x, struct nfattr *cda[])
1389{
1390 return -EOPNOTSUPP;
1391}
1392
1393static int
1394ctnetlink_create_expect(struct nfattr *cda[])
1395{
1396 struct ip_conntrack_tuple tuple, mask, master_tuple;
1397 struct ip_conntrack_tuple_hash *h = NULL;
1398 struct ip_conntrack_expect *exp;
1399 struct ip_conntrack *ct;
1400 int err = 0;
1401
1402 DEBUGP("entered %s\n", __FUNCTION__);
1403
1444fc55 1404 /* caller guarantees that those three CTA_EXPECT_* exist */
080774a2
HW		 1405 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1406 if (err < 0)
1407 return err;
bd9a26b7 1408 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK);
080774a2
HW		 1409 if (err < 0)
1410 return err;
1444fc55 1411 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER);
080774a2
HW		 1412 if (err < 0)
1413 return err;
1414
1415 /* Look for master conntrack of this expectation */
1416 h = ip_conntrack_find_get(&master_tuple, NULL);
1417 if (!h)
1418 return -ENOENT;
1419 ct = tuplehash_to_ctrack(h);
1420
1421 if (!ct->helper) {
1422 /* such conntrack hasn't got any helper, abort */
1423 err = -EINVAL;
1424 goto out;
1425 }
1426
1427 exp = ip_conntrack_expect_alloc(ct);
1428 if (!exp) {
1429 err = -ENOMEM;
1430 goto out;
1431 }
1432
1433 exp->expectfn = NULL;
2248bcfc 1434 exp->flags = 0;
080774a2
HW		 1435 exp->master = ct;
1436 memcpy(&exp->tuple, &tuple, sizeof(struct ip_conntrack_tuple));
1437 memcpy(&exp->mask, &mask, sizeof(struct ip_conntrack_tuple));
1438
1439 err = ip_conntrack_expect_related(exp);
1440 ip_conntrack_expect_put(exp);
1441
1442out:
1443 ip_conntrack_put(tuplehash_to_ctrack(h));
1444 return err;
1445}
1446
1447static int
1448ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1449 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1450{
1451 struct ip_conntrack_tuple tuple;
1452 struct ip_conntrack_expect *exp;
1453 int err = 0;
1454
1455 DEBUGP("entered %s\n", __FUNCTION__);
1456
1444fc55
HW		 1457 if (!cda[CTA_EXPECT_TUPLE-1]
1458 || !cda[CTA_EXPECT_MASK-1]
1459 || !cda[CTA_EXPECT_MASTER-1])
080774a2
HW		 1460 return -EINVAL;
1461
1462 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1463 if (err < 0)
1464 return err;
1465
1466 write_lock_bh(&ip_conntrack_lock);
1467 exp = __ip_conntrack_expect_find(&tuple);
1468
1469 if (!exp) {
1470 write_unlock_bh(&ip_conntrack_lock);
1471 err = -ENOENT;
1472 if (nlh->nlmsg_flags & NLM_F_CREATE)
1473 err = ctnetlink_create_expect(cda);
1474 return err;
1475 }
1476
1477 err = -EEXIST;
1478 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1479 err = ctnetlink_change_expect(exp, cda);
1480 write_unlock_bh(&ip_conntrack_lock);
1481
1482 DEBUGP("leaving\n");
1483
1484 return err;
1485}
1486
1487#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1488static struct notifier_block ctnl_notifier = {
1489 .notifier_call = ctnetlink_conntrack_event,
1490};
1491
1492static struct notifier_block ctnl_notifier_exp = {
1493 .notifier_call = ctnetlink_expect_event,
1494};
1495#endif
1496
1497static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1498 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
927ccbcc 1499 .attr_count = CTA_MAX,
080774a2
HW		 1500 .cap_required = CAP_NET_ADMIN },
1501 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
927ccbcc 1502 .attr_count = CTA_MAX,
080774a2
HW		 1503 .cap_required = CAP_NET_ADMIN },
1504 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
927ccbcc 1505 .attr_count = CTA_MAX,
080774a2
HW		 1506 .cap_required = CAP_NET_ADMIN },
1507 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
927ccbcc 1508 .attr_count = CTA_MAX,
080774a2
HW		 1509 .cap_required = CAP_NET_ADMIN },
1510};
1511
28b19d99 1512static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
080774a2 1513 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
927ccbcc 1514 .attr_count = CTA_EXPECT_MAX,
080774a2
HW		 1515 .cap_required = CAP_NET_ADMIN },
1516 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
927ccbcc 1517 .attr_count = CTA_EXPECT_MAX,
080774a2
HW		 1518 .cap_required = CAP_NET_ADMIN },
1519 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
927ccbcc 1520 .attr_count = CTA_EXPECT_MAX,
080774a2
HW		 1521 .cap_required = CAP_NET_ADMIN },
1522};
1523
1524static struct nfnetlink_subsystem ctnl_subsys = {
1525 .name = "conntrack",
1526 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1527 .cb_count = IPCTNL_MSG_MAX,
080774a2
HW		 1528 .cb = ctnl_cb,
1529};
1530
1531static struct nfnetlink_subsystem ctnl_exp_subsys = {
1532 .name = "conntrack_expect",
1533 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1534 .cb_count = IPCTNL_MSG_EXP_MAX,
080774a2
HW		 1535 .cb = ctnl_exp_cb,
1536};
1537
119a3184
PNA		 1538MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1539
080774a2
HW		 1540static int __init ctnetlink_init(void)
1541{
1542 int ret;
1543
1544 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1545 ret = nfnetlink_subsys_register(&ctnl_subsys);
1546 if (ret < 0) {
1547 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1548 goto err_out;
1549 }
1550
1551 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1552 if (ret < 0) {
1553 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1554 goto err_unreg_subsys;
1555 }
1556
1557#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1558 ret = ip_conntrack_register_notifier(&ctnl_notifier);
1559 if (ret < 0) {
1560 printk("ctnetlink_init: cannot register notifier.\n");
1561 goto err_unreg_exp_subsys;
1562 }
1563
1564 ret = ip_conntrack_expect_register_notifier(&ctnl_notifier_exp);
1565 if (ret < 0) {
1566 printk("ctnetlink_init: cannot expect register notifier.\n");
1567 goto err_unreg_notifier;
1568 }
1569#endif
1570
1571 return 0;
1572
1573#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1574err_unreg_notifier:
1575 ip_conntrack_unregister_notifier(&ctnl_notifier);
1576err_unreg_exp_subsys:
1577 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1578#endif
1579err_unreg_subsys:
1580 nfnetlink_subsys_unregister(&ctnl_subsys);
1581err_out:
1582 return ret;
1583}
1584
1585static void __exit ctnetlink_exit(void)
1586{
1587 printk("ctnetlink: unregistering from nfnetlink.\n");
1588
1589#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1590 ip_conntrack_unregister_notifier(&ctnl_notifier_exp);
1591 ip_conntrack_unregister_notifier(&ctnl_notifier);
1592#endif
1593
1594 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1595 nfnetlink_subsys_unregister(&ctnl_subsys);
1596 return;
1597}
1598
1599module_init(ctnetlink_init);
1600module_exit(ctnetlink_exit);
Linux kernel - Deliverables
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