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[net-next-2.6.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>
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 * 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>
32#include <linux/notifier.h>
33
34#include <linux/netfilter.h>
35#include <net/netfilter/nf_conntrack.h>
36#include <net/netfilter/nf_conntrack_core.h>
37#include <net/netfilter/nf_conntrack_helper.h>
38#include <net/netfilter/nf_conntrack_l3proto.h>
39#include <net/netfilter/nf_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[] = "0.92";
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 nf_conntrack_tuple *tuple)
59{
60 struct nf_conntrack_protocol *proto;
61 int ret = 0;
62
63 NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
64
65 /* If no protocol helper is found, this function will return the
66 * generic protocol helper, so proto won't *ever* be NULL */
67 proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
68 if (likely(proto->tuple_to_nfattr))
69 ret = proto->tuple_to_nfattr(skb, tuple);
70
71 nf_ct_proto_put(proto);
72
73 return ret;
74
75nfattr_failure:
76 return -1;
77}
78
79static inline int
80ctnetlink_dump_tuples(struct sk_buff *skb,
81 const struct nf_conntrack_tuple *tuple)
82{
83 struct nfattr *nest_parms;
84 struct nf_conntrack_l3proto *l3proto;
85 int ret = 0;
86
87 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
88
89 nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
90 if (likely(l3proto->tuple_to_nfattr))
91 ret = l3proto->tuple_to_nfattr(skb, tuple);
92 NFA_NEST_END(skb, nest_parms);
93
94 nf_ct_l3proto_put(l3proto);
95
96 if (unlikely(ret < 0))
97 return ret;
98
99 nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
100 ret = ctnetlink_dump_tuples_proto(skb, tuple);
101 NFA_NEST_END(skb, nest_parms);
102
103 return ret;
104
105nfattr_failure:
106 return -1;
107}
108
109static inline int
110ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
111{
112 u_int32_t status = htonl((u_int32_t) ct->status);
113 NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
114 return 0;
115
116nfattr_failure:
117 return -1;
118}
119
120static inline int
121ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
122{
123 long timeout_l = ct->timeout.expires - jiffies;
124 u_int32_t timeout;
125
126 if (timeout_l < 0)
127 timeout = 0;
128 else
129 timeout = htonl(timeout_l / HZ);
130
131 NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
132 return 0;
133
134nfattr_failure:
135 return -1;
136}
137
138static inline int
139ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
140{
141 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);
142 struct nfattr *nest_proto;
143 int ret;
144
145 if (!proto->to_nfattr) {
146 nf_ct_proto_put(proto);
147 return 0;
148 }
149
150 nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
151
152 ret = proto->to_nfattr(skb, nest_proto, ct);
153
154 nf_ct_proto_put(proto);
155
156 NFA_NEST_END(skb, nest_proto);
157
158 return ret;
159
160nfattr_failure:
161 return -1;
162}
163
164static inline int
165ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
166{
167 struct nfattr *nest_helper;
168
169 if (!ct->helper)
170 return 0;
171
172 nest_helper = NFA_NEST(skb, CTA_HELP);
173 NFA_PUT(skb, CTA_HELP_NAME, strlen(ct->helper->name), ct->helper->name);
174
175 if (ct->helper->to_nfattr)
176 ct->helper->to_nfattr(skb, ct);
177
178 NFA_NEST_END(skb, nest_helper);
179
180 return 0;
181
182nfattr_failure:
183 return -1;
184}
185
186#ifdef CONFIG_NF_CT_ACCT
187static inline int
188ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
189 enum ip_conntrack_dir dir)
190{
191 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
192 struct nfattr *nest_count = NFA_NEST(skb, type);
193 u_int32_t tmp;
194
195 tmp = htonl(ct->counters[dir].packets);
196 NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
197
198 tmp = htonl(ct->counters[dir].bytes);
199 NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
200
201 NFA_NEST_END(skb, nest_count);
202
203 return 0;
204
205nfattr_failure:
206 return -1;
207}
208#else
209#define ctnetlink_dump_counters(a, b, c) (0)
210#endif
211
212#ifdef CONFIG_NF_CONNTRACK_MARK
213static inline int
214ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
215{
216 u_int32_t mark = htonl(ct->mark);
217
218 NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
219 return 0;
220
221nfattr_failure:
222 return -1;
223}
224#else
225#define ctnetlink_dump_mark(a, b) (0)
226#endif
227
228static inline int
229ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
230{
231 u_int32_t id = htonl(ct->id);
232 NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
233 return 0;
234
235nfattr_failure:
236 return -1;
237}
238
239static inline int
240ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
241{
242 u_int32_t use = htonl(atomic_read(&ct->ct_general.use));
243
244 NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
245 return 0;
246
247nfattr_failure:
248 return -1;
249}
250
251#define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
252
253static int
254ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
255 int event, int nowait,
256 const struct nf_conn *ct)
257{
258 struct nlmsghdr *nlh;
259 struct nfgenmsg *nfmsg;
260 struct nfattr *nest_parms;
261 unsigned char *b;
262
263 b = skb->tail;
264
265 event |= NFNL_SUBSYS_CTNETLINK << 8;
266 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
267 nfmsg = NLMSG_DATA(nlh);
268
269 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
270 nfmsg->nfgen_family =
271 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
272 nfmsg->version = NFNETLINK_V0;
273 nfmsg->res_id = 0;
274
275 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
276 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
277 goto nfattr_failure;
278 NFA_NEST_END(skb, nest_parms);
279
280 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
281 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
282 goto nfattr_failure;
283 NFA_NEST_END(skb, nest_parms);
284
285 if (ctnetlink_dump_status(skb, ct) < 0 ||
286 ctnetlink_dump_timeout(skb, ct) < 0 ||
287 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
288 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
289 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
290 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
291 ctnetlink_dump_mark(skb, ct) < 0 ||
292 ctnetlink_dump_id(skb, ct) < 0 ||
293 ctnetlink_dump_use(skb, ct) < 0)
294 goto nfattr_failure;
295
296 nlh->nlmsg_len = skb->tail - b;
297 return skb->len;
298
299nlmsg_failure:
300nfattr_failure:
301 skb_trim(skb, b - skb->data);
302 return -1;
303}
304
305#ifdef CONFIG_NF_CONNTRACK_EVENTS
306static int ctnetlink_conntrack_event(struct notifier_block *this,
307 unsigned long events, void *ptr)
308{
309 struct nlmsghdr *nlh;
310 struct nfgenmsg *nfmsg;
311 struct nfattr *nest_parms;
312 struct nf_conn *ct = (struct nf_conn *)ptr;
313 struct sk_buff *skb;
314 unsigned int type;
315 unsigned char *b;
316 unsigned int flags = 0, group;
317
318 /* ignore our fake conntrack entry */
319 if (ct == &nf_conntrack_untracked)
320 return NOTIFY_DONE;
321
322 if (events & IPCT_DESTROY) {
323 type = IPCTNL_MSG_CT_DELETE;
324 group = NFNLGRP_CONNTRACK_DESTROY;
325 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
326 type = IPCTNL_MSG_CT_NEW;
327 flags = NLM_F_CREATE|NLM_F_EXCL;
328 /* dump everything */
329 events = ~0UL;
330 group = NFNLGRP_CONNTRACK_NEW;
331 } else if (events & (IPCT_STATUS |
332 IPCT_PROTOINFO |
333 IPCT_HELPER |
334 IPCT_HELPINFO |
335 IPCT_NATINFO)) {
336 type = IPCTNL_MSG_CT_NEW;
337 group = NFNLGRP_CONNTRACK_UPDATE;
338 } else
339 return NOTIFY_DONE;
340
341 /* FIXME: Check if there are any listeners before, don't hurt performance */
342
343 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
344 if (!skb)
345 return NOTIFY_DONE;
346
347 b = skb->tail;
348
349 type |= NFNL_SUBSYS_CTNETLINK << 8;
350 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
351 nfmsg = NLMSG_DATA(nlh);
352
353 nlh->nlmsg_flags = flags;
354 nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
355 nfmsg->version = NFNETLINK_V0;
356 nfmsg->res_id = 0;
357
358 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
359 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
360 goto nfattr_failure;
361 NFA_NEST_END(skb, nest_parms);
362
363 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
364 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
365 goto nfattr_failure;
366 NFA_NEST_END(skb, nest_parms);
367
368 /* NAT stuff is now a status flag */
369 if ((events & IPCT_STATUS || events & IPCT_NATINFO)
370 && ctnetlink_dump_status(skb, ct) < 0)
371 goto nfattr_failure;
372 if (events & IPCT_REFRESH
373 && ctnetlink_dump_timeout(skb, ct) < 0)
374 goto nfattr_failure;
375 if (events & IPCT_PROTOINFO
376 && ctnetlink_dump_protoinfo(skb, ct) < 0)
377 goto nfattr_failure;
378 if (events & IPCT_HELPINFO
379 && ctnetlink_dump_helpinfo(skb, ct) < 0)
380 goto nfattr_failure;
381
382 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
383 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
384 goto nfattr_failure;
385
386 nlh->nlmsg_len = skb->tail - b;
387 nfnetlink_send(skb, 0, group, 0);
388 return NOTIFY_DONE;
389
390nlmsg_failure:
391nfattr_failure:
392 kfree_skb(skb);
393 return NOTIFY_DONE;
394}
395#endif /* CONFIG_NF_CONNTRACK_EVENTS */
396
397static int ctnetlink_done(struct netlink_callback *cb)
398{
399 DEBUGP("entered %s\n", __FUNCTION__);
400 return 0;
401}
402
87711cb8
PNA		 403#define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
404
c1d10adb
PNA		 405static int
406ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
407{
408 struct nf_conn *ct = NULL;
409 struct nf_conntrack_tuple_hash *h;
410 struct list_head *i;
411 u_int32_t *id = (u_int32_t *) &cb->args[1];
87711cb8
PNA		 412 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
413 u_int8_t l3proto = nfmsg->nfgen_family;
c1d10adb
PNA		 414
415 DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__,
416 cb->args[0], *id);
417
418 read_lock_bh(&nf_conntrack_lock);
419 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++, *id = 0) {
420 list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
421 h = (struct nf_conntrack_tuple_hash *) i;
422 if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
423 continue;
424 ct = nf_ct_tuplehash_to_ctrack(h);
87711cb8
PNA		 425 /* Dump entries of a given L3 protocol number.
426 * If it is not specified, ie. l3proto == 0,
427 * then dump everything. */
428 if (l3proto && L3PROTO(ct) != l3proto)
429 continue;
c1d10adb
PNA		 430 if (ct->id <= *id)
431 continue;
432 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
433 cb->nlh->nlmsg_seq,
434 IPCTNL_MSG_CT_NEW,
435 1, ct) < 0)
436 goto out;
437 *id = ct->id;
438 }
439 }
440out:
441 read_unlock_bh(&nf_conntrack_lock);
442
443 DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
444
445 return skb->len;
446}
447
448#ifdef CONFIG_NF_CT_ACCT
449static int
450ctnetlink_dump_table_w(struct sk_buff *skb, struct netlink_callback *cb)
451{
452 struct nf_conn *ct = NULL;
453 struct nf_conntrack_tuple_hash *h;
454 struct list_head *i;
455 u_int32_t *id = (u_int32_t *) &cb->args[1];
87711cb8
PNA		 456 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
457 u_int8_t l3proto = nfmsg->nfgen_family;
c1d10adb
PNA		 458
459 DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__,
460 cb->args[0], *id);
461
462 write_lock_bh(&nf_conntrack_lock);
463 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++, *id = 0) {
464 list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
465 h = (struct nf_conntrack_tuple_hash *) i;
466 if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
467 continue;
468 ct = nf_ct_tuplehash_to_ctrack(h);
87711cb8
PNA		 469 if (l3proto && L3PROTO(ct) != l3proto)
470 continue;
c1d10adb
PNA		 471 if (ct->id <= *id)
472 continue;
473 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
474 cb->nlh->nlmsg_seq,
475 IPCTNL_MSG_CT_NEW,
476 1, ct) < 0)
477 goto out;
478 *id = ct->id;
479
480 memset(&ct->counters, 0, sizeof(ct->counters));
481 }
482 }
483out:
484 write_unlock_bh(&nf_conntrack_lock);
485
486 DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
487
488 return skb->len;
489}
490#endif
491
492static inline int
493ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple)
494{
495 struct nfattr *tb[CTA_IP_MAX];
496 struct nf_conntrack_l3proto *l3proto;
497 int ret = 0;
498
499 DEBUGP("entered %s\n", __FUNCTION__);
500
501 nfattr_parse_nested(tb, CTA_IP_MAX, attr);
502
503 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
504
505 if (likely(l3proto->nfattr_to_tuple))
506 ret = l3proto->nfattr_to_tuple(tb, tuple);
507
508 nf_ct_l3proto_put(l3proto);
509
510 DEBUGP("leaving\n");
511
512 return ret;
513}
514
515static const size_t cta_min_proto[CTA_PROTO_MAX] = {
516 [CTA_PROTO_NUM-1] = sizeof(u_int8_t),
517};
518
519static inline int
520ctnetlink_parse_tuple_proto(struct nfattr *attr,
521 struct nf_conntrack_tuple *tuple)
522{
523 struct nfattr *tb[CTA_PROTO_MAX];
524 struct nf_conntrack_protocol *proto;
525 int ret = 0;
526
527 DEBUGP("entered %s\n", __FUNCTION__);
528
529 nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
530
531 if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
532 return -EINVAL;
533
534 if (!tb[CTA_PROTO_NUM-1])
535 return -EINVAL;
536 tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
537
538 proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
539
540 if (likely(proto->nfattr_to_tuple))
541 ret = proto->nfattr_to_tuple(tb, tuple);
542
543 nf_ct_proto_put(proto);
544
545 return ret;
546}
547
548static inline int
549ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple,
550 enum ctattr_tuple type, u_int8_t l3num)
551{
552 struct nfattr *tb[CTA_TUPLE_MAX];
553 int err;
554
555 DEBUGP("entered %s\n", __FUNCTION__);
556
557 memset(tuple, 0, sizeof(*tuple));
558
559 nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
560
561 if (!tb[CTA_TUPLE_IP-1])
562 return -EINVAL;
563
564 tuple->src.l3num = l3num;
565
566 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
567 if (err < 0)
568 return err;
569
570 if (!tb[CTA_TUPLE_PROTO-1])
571 return -EINVAL;
572
573 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
574 if (err < 0)
575 return err;
576
577 /* orig and expect tuples get DIR_ORIGINAL */
578 if (type == CTA_TUPLE_REPLY)
579 tuple->dst.dir = IP_CT_DIR_REPLY;
580 else
581 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
582
583 NF_CT_DUMP_TUPLE(tuple);
584
585 DEBUGP("leaving\n");
586
587 return 0;
588}
589
590#ifdef CONFIG_IP_NF_NAT_NEEDED
591static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
592 [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t),
593 [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t),
594};
595
596static int ctnetlink_parse_nat_proto(struct nfattr *attr,
597 const struct nf_conn *ct,
598 struct ip_nat_range *range)
599{
600 struct nfattr *tb[CTA_PROTONAT_MAX];
601 struct ip_nat_protocol *npt;
602
603 DEBUGP("entered %s\n", __FUNCTION__);
604
605 nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
606
607 if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
608 return -EINVAL;
609
610 npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
611
612 if (!npt->nfattr_to_range) {
613 ip_nat_proto_put(npt);
614 return 0;
615 }
616
617 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
618 if (npt->nfattr_to_range(tb, range) > 0)
619 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
620
621 ip_nat_proto_put(npt);
622
623 DEBUGP("leaving\n");
624 return 0;
625}
626
627static const size_t cta_min_nat[CTA_NAT_MAX] = {
628 [CTA_NAT_MINIP-1] = sizeof(u_int32_t),
629 [CTA_NAT_MAXIP-1] = sizeof(u_int32_t),
630};
631
632static inline int
633ctnetlink_parse_nat(struct nfattr *cda[],
634 const struct nf_conn *ct, struct ip_nat_range *range)
635{
636 struct nfattr *tb[CTA_NAT_MAX];
637 int err;
638
639 DEBUGP("entered %s\n", __FUNCTION__);
640
641 memset(range, 0, sizeof(*range));
642
643 nfattr_parse_nested(tb, CTA_NAT_MAX, cda[CTA_NAT-1]);
644
645 if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
646 return -EINVAL;
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}
669#endif
670
671static inline int
672ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
673{
674 struct nfattr *tb[CTA_HELP_MAX];
675
676 DEBUGP("entered %s\n", __FUNCTION__);
677
678 nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
679
680 if (!tb[CTA_HELP_NAME-1])
681 return -EINVAL;
682
683 *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
684
685 return 0;
686}
687
688static const size_t cta_min[CTA_MAX] = {
689 [CTA_STATUS-1] = sizeof(u_int32_t),
690 [CTA_TIMEOUT-1] = sizeof(u_int32_t),
691 [CTA_MARK-1] = sizeof(u_int32_t),
692 [CTA_USE-1] = sizeof(u_int32_t),
693 [CTA_ID-1] = sizeof(u_int32_t)
694};
695
696static int
697ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
698 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
699{
700 struct nf_conntrack_tuple_hash *h;
701 struct nf_conntrack_tuple tuple;
702 struct nf_conn *ct;
703 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
704 u_int8_t u3 = nfmsg->nfgen_family;
705 int err = 0;
706
707 DEBUGP("entered %s\n", __FUNCTION__);
708
709 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
710 return -EINVAL;
711
712 if (cda[CTA_TUPLE_ORIG-1])
713 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
714 else if (cda[CTA_TUPLE_REPLY-1])
715 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
716 else {
717 /* Flush the whole table */
718 nf_conntrack_flush();
719 return 0;
720 }
721
722 if (err < 0)
723 return err;
724
725 h = nf_conntrack_find_get(&tuple, NULL);
726 if (!h) {
727 DEBUGP("tuple not found in conntrack hash\n");
728 return -ENOENT;
729 }
730
731 ct = nf_ct_tuplehash_to_ctrack(h);
732
733 if (cda[CTA_ID-1]) {
734 u_int32_t id = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_ID-1]));
735 if (ct->id != id) {
736 nf_ct_put(ct);
737 return -ENOENT;
738 }
739 }
740 if (del_timer(&ct->timeout))
741 ct->timeout.function((unsigned long)ct);
742
743 nf_ct_put(ct);
744 DEBUGP("leaving\n");
745
746 return 0;
747}
748
749static int
750ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
751 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
752{
753 struct nf_conntrack_tuple_hash *h;
754 struct nf_conntrack_tuple tuple;
755 struct nf_conn *ct;
756 struct sk_buff *skb2 = NULL;
757 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
758 u_int8_t u3 = nfmsg->nfgen_family;
759 int err = 0;
760
761 DEBUGP("entered %s\n", __FUNCTION__);
762
763 if (nlh->nlmsg_flags & NLM_F_DUMP) {
764 u32 rlen;
765
c1d10adb
PNA		 766 if (NFNL_MSG_TYPE(nlh->nlmsg_type) ==
767 IPCTNL_MSG_CT_GET_CTRZERO) {
768#ifdef CONFIG_NF_CT_ACCT
769 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
770 ctnetlink_dump_table_w,
771 ctnetlink_done)) != 0)
772 return -EINVAL;
773#else
774 return -ENOTSUPP;
775#endif
776 } else {
777 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
778 ctnetlink_dump_table,
779 ctnetlink_done)) != 0)
780 return -EINVAL;
781 }
782
783 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
784 if (rlen > skb->len)
785 rlen = skb->len;
786 skb_pull(skb, rlen);
787 return 0;
788 }
789
790 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
791 return -EINVAL;
792
793 if (cda[CTA_TUPLE_ORIG-1])
794 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
795 else if (cda[CTA_TUPLE_REPLY-1])
796 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
797 else
798 return -EINVAL;
799
800 if (err < 0)
801 return err;
802
803 h = nf_conntrack_find_get(&tuple, NULL);
804 if (!h) {
805 DEBUGP("tuple not found in conntrack hash");
806 return -ENOENT;
807 }
808 DEBUGP("tuple found\n");
809 ct = nf_ct_tuplehash_to_ctrack(h);
810
811 err = -ENOMEM;
812 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
813 if (!skb2) {
814 nf_ct_put(ct);
815 return -ENOMEM;
816 }
817 NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
818
819 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
820 IPCTNL_MSG_CT_NEW, 1, ct);
821 nf_ct_put(ct);
822 if (err <= 0)
823 goto free;
824
825 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
826 if (err < 0)
827 goto out;
828
829 DEBUGP("leaving\n");
830 return 0;
831
832free:
833 kfree_skb(skb2);
834out:
835 return err;
836}
837
838static inline int
839ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[])
840{
841 unsigned long d;
842 unsigned status = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_STATUS-1]));
843 d = ct->status ^ status;
844
845 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
846 /* unchangeable */
847 return -EINVAL;
848
849 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
850 /* SEEN_REPLY bit can only be set */
851 return -EINVAL;
852
853
854 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
855 /* ASSURED bit can only be set */
856 return -EINVAL;
857
858 if (cda[CTA_NAT-1]) {
859#ifndef CONFIG_IP_NF_NAT_NEEDED
860 return -EINVAL;
861#else
862 unsigned int hooknum;
863 struct ip_nat_range range;
864
865 if (ctnetlink_parse_nat(cda, ct, &range) < 0)
866 return -EINVAL;
867
868 DEBUGP("NAT: %u.%u.%u.%u-%u.%u.%u.%u:%u-%u\n",
869 NIPQUAD(range.min_ip), NIPQUAD(range.max_ip),
870 htons(range.min.all), htons(range.max.all));
871
872 /* This is tricky but it works. ip_nat_setup_info needs the
873 * hook number as parameter, so let's do the correct
874 * conversion and run away */
875 if (status & IPS_SRC_NAT_DONE)
876 hooknum = NF_IP_POST_ROUTING; /* IP_NAT_MANIP_SRC */
877 else if (status & IPS_DST_NAT_DONE)
878 hooknum = NF_IP_PRE_ROUTING; /* IP_NAT_MANIP_DST */
879 else
880 return -EINVAL; /* Missing NAT flags */
881
882 DEBUGP("NAT status: %lu\n",
883 status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
884
885 if (ip_nat_initialized(ct, HOOK2MANIP(hooknum)))
886 return -EEXIST;
887 ip_nat_setup_info(ct, &range, hooknum);
888
889 DEBUGP("NAT status after setup_info: %lu\n",
890 ct->status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
891#endif
892 }
893
894 /* Be careful here, modifying NAT bits can screw up things,
895 * so don't let users modify them directly if they don't pass
896 * ip_nat_range. */
897 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
898 return 0;
899}
900
901
902static inline int
903ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[])
904{
905 struct nf_conntrack_helper *helper;
906 char *helpname;
907 int err;
908
909 DEBUGP("entered %s\n", __FUNCTION__);
910
911 /* don't change helper of sibling connections */
912 if (ct->master)
913 return -EINVAL;
914
915 err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
916 if (err < 0)
917 return err;
918
919 helper = __nf_conntrack_helper_find_byname(helpname);
920 if (!helper) {
921 if (!strcmp(helpname, ""))
922 helper = NULL;
923 else
924 return -EINVAL;
925 }
926
927 if (ct->helper) {
928 if (!helper) {
929 /* we had a helper before ... */
930 nf_ct_remove_expectations(ct);
931 ct->helper = NULL;
932 } else {
933 /* need to zero data of old helper */
934 memset(&ct->help, 0, sizeof(ct->help));
935 }
936 }
937
938 ct->helper = helper;
939
940 return 0;
941}
942
943static inline int
944ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[])
945{
946 u_int32_t timeout = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
947
948 if (!del_timer(&ct->timeout))
949 return -ETIME;
950
951 ct->timeout.expires = jiffies + timeout * HZ;
952 add_timer(&ct->timeout);
953
954 return 0;
955}
956
957static inline int
958ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[])
959{
960 struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
961 struct nf_conntrack_protocol *proto;
962 u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
963 u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
964 int err = 0;
965
966 nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
967
968 proto = nf_ct_proto_find_get(l3num, npt);
969
970 if (proto->from_nfattr)
971 err = proto->from_nfattr(tb, ct);
972 nf_ct_proto_put(proto);
973
974 return err;
975}
976
977static int
978ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[])
979{
980 int err;
981
982 DEBUGP("entered %s\n", __FUNCTION__);
983
984 if (cda[CTA_HELP-1]) {
985 err = ctnetlink_change_helper(ct, cda);
986 if (err < 0)
987 return err;
988 }
989
990 if (cda[CTA_TIMEOUT-1]) {
991 err = ctnetlink_change_timeout(ct, cda);
992 if (err < 0)
993 return err;
994 }
995
996 if (cda[CTA_STATUS-1]) {
997 err = ctnetlink_change_status(ct, cda);
998 if (err < 0)
999 return err;
1000 }
1001
1002 if (cda[CTA_PROTOINFO-1]) {
1003 err = ctnetlink_change_protoinfo(ct, cda);
1004 if (err < 0)
1005 return err;
1006 }
1007
1008#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
1009 if (cda[CTA_MARK-1])
1010 ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
1011#endif
1012
1013 DEBUGP("all done\n");
1014 return 0;
1015}
1016
1017static int
1018ctnetlink_create_conntrack(struct nfattr *cda[],
1019 struct nf_conntrack_tuple *otuple,
1020 struct nf_conntrack_tuple *rtuple)
1021{
1022 struct nf_conn *ct;
1023 int err = -EINVAL;
1024
1025 DEBUGP("entered %s\n", __FUNCTION__);
1026
1027 ct = nf_conntrack_alloc(otuple, rtuple);
1028 if (ct == NULL || IS_ERR(ct))
1029 return -ENOMEM;
1030
1031 if (!cda[CTA_TIMEOUT-1])
1032 goto err;
1033 ct->timeout.expires = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
1034
1035 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1036 ct->status |= IPS_CONFIRMED;
1037
1038 err = ctnetlink_change_status(ct, cda);
1039 if (err < 0)
1040 goto err;
1041
1042 if (cda[CTA_PROTOINFO-1]) {
1043 err = ctnetlink_change_protoinfo(ct, cda);
1044 if (err < 0)
1045 return err;
1046 }
1047
1048#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
1049 if (cda[CTA_MARK-1])
1050 ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
1051#endif
1052
1053 ct->helper = nf_ct_helper_find_get(rtuple);
1054
1055 add_timer(&ct->timeout);
1056 nf_conntrack_hash_insert(ct);
1057
1058 if (ct->helper)
1059 nf_ct_helper_put(ct->helper);
1060
1061 DEBUGP("conntrack with id %u inserted\n", ct->id);
1062 return 0;
1063
1064err:
1065 nf_conntrack_free(ct);
1066 return err;
1067}
1068
1069static int
1070ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1071 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1072{
1073 struct nf_conntrack_tuple otuple, rtuple;
1074 struct nf_conntrack_tuple_hash *h = NULL;
1075 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1076 u_int8_t u3 = nfmsg->nfgen_family;
1077 int err = 0;
1078
1079 DEBUGP("entered %s\n", __FUNCTION__);
1080
1081 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
1082 return -EINVAL;
1083
1084 if (cda[CTA_TUPLE_ORIG-1]) {
1085 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1086 if (err < 0)
1087 return err;
1088 }
1089
1090 if (cda[CTA_TUPLE_REPLY-1]) {
1091 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1092 if (err < 0)
1093 return err;
1094 }
1095
1096 write_lock_bh(&nf_conntrack_lock);
1097 if (cda[CTA_TUPLE_ORIG-1])
1098 h = __nf_conntrack_find(&otuple, NULL);
1099 else if (cda[CTA_TUPLE_REPLY-1])
1100 h = __nf_conntrack_find(&rtuple, NULL);
1101
1102 if (h == NULL) {
1103 write_unlock_bh(&nf_conntrack_lock);
1104 DEBUGP("no such conntrack, create new\n");
1105 err = -ENOENT;
1106 if (nlh->nlmsg_flags & NLM_F_CREATE)
1107 err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
1108 return err;
1109 }
1110 /* implicit 'else' */
1111
1112 /* we only allow nat config for new conntracks */
1113 if (cda[CTA_NAT-1]) {
1114 err = -EINVAL;
1115 goto out_unlock;
1116 }
1117
1118 /* We manipulate the conntrack inside the global conntrack table lock,
1119 * so there's no need to increase the refcount */
1120 DEBUGP("conntrack found\n");
1121 err = -EEXIST;
1122 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1123 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda);
1124
1125out_unlock:
1126 write_unlock_bh(&nf_conntrack_lock);
1127 return err;
1128}
1129
1130/***********************************************************************
1131 * EXPECT
1132 ***********************************************************************/
1133
1134static inline int
1135ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1136 const struct nf_conntrack_tuple *tuple,
1137 enum ctattr_expect type)
1138{
1139 struct nfattr *nest_parms = NFA_NEST(skb, type);
1140
1141 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1142 goto nfattr_failure;
1143
1144 NFA_NEST_END(skb, nest_parms);
1145
1146 return 0;
1147
1148nfattr_failure:
1149 return -1;
1150}
1151
1152static inline int
1153ctnetlink_exp_dump_expect(struct sk_buff *skb,
1154 const struct nf_conntrack_expect *exp)
1155{
1156 struct nf_conn *master = exp->master;
1157 u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1158 u_int32_t id = htonl(exp->id);
1159
1160 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1161 goto nfattr_failure;
1162 if (ctnetlink_exp_dump_tuple(skb, &exp->mask, CTA_EXPECT_MASK) < 0)
1163 goto nfattr_failure;
1164 if (ctnetlink_exp_dump_tuple(skb,
1165 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1166 CTA_EXPECT_MASTER) < 0)
1167 goto nfattr_failure;
1168
1169 NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1170 NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1171
1172 return 0;
1173
1174nfattr_failure:
1175 return -1;
1176}
1177
1178static int
1179ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1180 int event,
1181 int nowait,
1182 const struct nf_conntrack_expect *exp)
1183{
1184 struct nlmsghdr *nlh;
1185 struct nfgenmsg *nfmsg;
1186 unsigned char *b;
1187
1188 b = skb->tail;
1189
1190 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1191 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1192 nfmsg = NLMSG_DATA(nlh);
1193
1194 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1195 nfmsg->nfgen_family = exp->tuple.src.l3num;
1196 nfmsg->version = NFNETLINK_V0;
1197 nfmsg->res_id = 0;
1198
1199 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1200 goto nfattr_failure;
1201
1202 nlh->nlmsg_len = skb->tail - b;
1203 return skb->len;
1204
1205nlmsg_failure:
1206nfattr_failure:
1207 skb_trim(skb, b - skb->data);
1208 return -1;
1209}
1210
1211#ifdef CONFIG_NF_CONNTRACK_EVENTS
1212static int ctnetlink_expect_event(struct notifier_block *this,
1213 unsigned long events, void *ptr)
1214{
1215 struct nlmsghdr *nlh;
1216 struct nfgenmsg *nfmsg;
1217 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1218 struct sk_buff *skb;
1219 unsigned int type;
1220 unsigned char *b;
1221 int flags = 0;
1222
1223 if (events & IPEXP_NEW) {
1224 type = IPCTNL_MSG_EXP_NEW;
1225 flags = NLM_F_CREATE|NLM_F_EXCL;
1226 } else
1227 return NOTIFY_DONE;
1228
1229 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1230 if (!skb)
1231 return NOTIFY_DONE;
1232
1233 b = skb->tail;
1234
b633ad5f 1235 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
c1d10adb
PNA		 1236 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1237 nfmsg = NLMSG_DATA(nlh);
1238
1239 nlh->nlmsg_flags = flags;
1240 nfmsg->nfgen_family = exp->tuple.src.l3num;
1241 nfmsg->version = NFNETLINK_V0;
1242 nfmsg->res_id = 0;
1243
1244 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1245 goto nfattr_failure;
1246
1247 nlh->nlmsg_len = skb->tail - b;
1248 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1249 return NOTIFY_DONE;
1250
1251nlmsg_failure:
1252nfattr_failure:
1253 kfree_skb(skb);
1254 return NOTIFY_DONE;
1255}
1256#endif
1257
1258static int
1259ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1260{
1261 struct nf_conntrack_expect *exp = NULL;
1262 struct list_head *i;
1263 u_int32_t *id = (u_int32_t *) &cb->args[0];
87711cb8
PNA		 1264 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1265 u_int8_t l3proto = nfmsg->nfgen_family;
c1d10adb
PNA		 1266
1267 DEBUGP("entered %s, last id=%llu\n", __FUNCTION__, *id);
1268
1269 read_lock_bh(&nf_conntrack_lock);
1270 list_for_each_prev(i, &nf_conntrack_expect_list) {
1271 exp = (struct nf_conntrack_expect *) i;
87711cb8
PNA		 1272 if (l3proto && exp->tuple.src.l3num != l3proto)
1273 continue;
c1d10adb
PNA		 1274 if (exp->id <= *id)
1275 continue;
1276 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1277 cb->nlh->nlmsg_seq,
1278 IPCTNL_MSG_EXP_NEW,
1279 1, exp) < 0)
1280 goto out;
1281 *id = exp->id;
1282 }
1283out:
1284 read_unlock_bh(&nf_conntrack_lock);
1285
1286 DEBUGP("leaving, last id=%llu\n", *id);
1287
1288 return skb->len;
1289}
1290
1291static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
1292 [CTA_EXPECT_TIMEOUT-1] = sizeof(u_int32_t),
1293 [CTA_EXPECT_ID-1] = sizeof(u_int32_t)
1294};
1295
1296static int
1297ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1298 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1299{
1300 struct nf_conntrack_tuple tuple;
1301 struct nf_conntrack_expect *exp;
1302 struct sk_buff *skb2;
1303 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1304 u_int8_t u3 = nfmsg->nfgen_family;
1305 int err = 0;
1306
1307 DEBUGP("entered %s\n", __FUNCTION__);
1308
1309 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1310 return -EINVAL;
1311
1312 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1313 u32 rlen;
1314
c1d10adb
PNA		 1315 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
1316 ctnetlink_exp_dump_table,
1317 ctnetlink_done)) != 0)
1318 return -EINVAL;
1319 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1320 if (rlen > skb->len)
1321 rlen = skb->len;
1322 skb_pull(skb, rlen);
1323 return 0;
1324 }
1325
1326 if (cda[CTA_EXPECT_MASTER-1])
1327 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1328 else
1329 return -EINVAL;
1330
1331 if (err < 0)
1332 return err;
1333
1334 exp = nf_conntrack_expect_find(&tuple);
1335 if (!exp)
1336 return -ENOENT;
1337
1338 if (cda[CTA_EXPECT_ID-1]) {
1339 u_int32_t id = *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1340 if (exp->id != ntohl(id)) {
1341 nf_conntrack_expect_put(exp);
1342 return -ENOENT;
1343 }
1344 }
1345
1346 err = -ENOMEM;
1347 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1348 if (!skb2)
1349 goto out;
1350 NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
1351
1352 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1353 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1354 1, exp);
1355 if (err <= 0)
1356 goto free;
1357
1358 nf_conntrack_expect_put(exp);
1359
1360 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1361
1362free:
1363 kfree_skb(skb2);
1364out:
1365 nf_conntrack_expect_put(exp);
1366 return err;
1367}
1368
1369static int
1370ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1371 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1372{
1373 struct nf_conntrack_expect *exp, *tmp;
1374 struct nf_conntrack_tuple tuple;
1375 struct nf_conntrack_helper *h;
1376 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1377 u_int8_t u3 = nfmsg->nfgen_family;
1378 int err;
1379
1380 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1381 return -EINVAL;
1382
1383 if (cda[CTA_EXPECT_TUPLE-1]) {
1384 /* delete a single expect by tuple */
1385 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1386 if (err < 0)
1387 return err;
1388
1389 /* bump usage count to 2 */
1390 exp = nf_conntrack_expect_find(&tuple);
1391 if (!exp)
1392 return -ENOENT;
1393
1394 if (cda[CTA_EXPECT_ID-1]) {
1395 u_int32_t id =
1396 *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1397 if (exp->id != ntohl(id)) {
1398 nf_conntrack_expect_put(exp);
1399 return -ENOENT;
1400 }
1401 }
1402
1403 /* after list removal, usage count == 1 */
1404 nf_conntrack_unexpect_related(exp);
1405 /* have to put what we 'get' above.
1406 * after this line usage count == 0 */
1407 nf_conntrack_expect_put(exp);
1408 } else if (cda[CTA_EXPECT_HELP_NAME-1]) {
1409 char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
1410
1411 /* delete all expectations for this helper */
1412 write_lock_bh(&nf_conntrack_lock);
1413 h = __nf_conntrack_helper_find_byname(name);
1414 if (!h) {
1415 write_unlock_bh(&nf_conntrack_lock);
1416 return -EINVAL;
1417 }
1418 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1419 list) {
1420 if (exp->master->helper == h
1421 && del_timer(&exp->timeout)) {
1422 nf_ct_unlink_expect(exp);
1423 nf_conntrack_expect_put(exp);
1424 }
1425 }
1426 write_unlock_bh(&nf_conntrack_lock);
1427 } else {
1428 /* This basically means we have to flush everything*/
1429 write_lock_bh(&nf_conntrack_lock);
1430 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1431 list) {
1432 if (del_timer(&exp->timeout)) {
1433 nf_ct_unlink_expect(exp);
1434 nf_conntrack_expect_put(exp);
1435 }
1436 }
1437 write_unlock_bh(&nf_conntrack_lock);
1438 }
1439
1440 return 0;
1441}
1442static int
1443ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[])
1444{
1445 return -EOPNOTSUPP;
1446}
1447
1448static int
1449ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3)
1450{
1451 struct nf_conntrack_tuple tuple, mask, master_tuple;
1452 struct nf_conntrack_tuple_hash *h = NULL;
1453 struct nf_conntrack_expect *exp;
1454 struct nf_conn *ct;
1455 int err = 0;
1456
1457 DEBUGP("entered %s\n", __FUNCTION__);
1458
1459 /* caller guarantees that those three CTA_EXPECT_* exist */
1460 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1461 if (err < 0)
1462 return err;
1463 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1464 if (err < 0)
1465 return err;
1466 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1467 if (err < 0)
1468 return err;
1469
1470 /* Look for master conntrack of this expectation */
1471 h = nf_conntrack_find_get(&master_tuple, NULL);
1472 if (!h)
1473 return -ENOENT;
1474 ct = nf_ct_tuplehash_to_ctrack(h);
1475
1476 if (!ct->helper) {
1477 /* such conntrack hasn't got any helper, abort */
1478 err = -EINVAL;
1479 goto out;
1480 }
1481
1482 exp = nf_conntrack_expect_alloc(ct);
1483 if (!exp) {
1484 err = -ENOMEM;
1485 goto out;
1486 }
1487
1488 exp->expectfn = NULL;
1489 exp->flags = 0;
1490 exp->master = ct;
1491 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1492 memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple));
1493
1494 err = nf_conntrack_expect_related(exp);
1495 nf_conntrack_expect_put(exp);
1496
1497out:
1498 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1499 return err;
1500}
1501
1502static int
1503ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1504 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1505{
1506 struct nf_conntrack_tuple tuple;
1507 struct nf_conntrack_expect *exp;
1508 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1509 u_int8_t u3 = nfmsg->nfgen_family;
1510 int err = 0;
1511
1512 DEBUGP("entered %s\n", __FUNCTION__);
1513
1514 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1515 return -EINVAL;
1516
1517 if (!cda[CTA_EXPECT_TUPLE-1]
1518 || !cda[CTA_EXPECT_MASK-1]
1519 || !cda[CTA_EXPECT_MASTER-1])
1520 return -EINVAL;
1521
1522 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1523 if (err < 0)
1524 return err;
1525
1526 write_lock_bh(&nf_conntrack_lock);
1527 exp = __nf_conntrack_expect_find(&tuple);
1528
1529 if (!exp) {
1530 write_unlock_bh(&nf_conntrack_lock);
1531 err = -ENOENT;
1532 if (nlh->nlmsg_flags & NLM_F_CREATE)
1533 err = ctnetlink_create_expect(cda, u3);
1534 return err;
1535 }
1536
1537 err = -EEXIST;
1538 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1539 err = ctnetlink_change_expect(exp, cda);
1540 write_unlock_bh(&nf_conntrack_lock);
1541
1542 DEBUGP("leaving\n");
1543
1544 return err;
1545}
1546
1547#ifdef CONFIG_NF_CONNTRACK_EVENTS
1548static struct notifier_block ctnl_notifier = {
1549 .notifier_call = ctnetlink_conntrack_event,
1550};
1551
1552static struct notifier_block ctnl_notifier_exp = {
1553 .notifier_call = ctnetlink_expect_event,
1554};
1555#endif
1556
1557static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1558 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1559 .attr_count = CTA_MAX, },
1560 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1561 .attr_count = CTA_MAX, },
1562 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1563 .attr_count = CTA_MAX, },
1564 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1565 .attr_count = CTA_MAX, },
1566};
1567
1568static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1569 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1570 .attr_count = CTA_EXPECT_MAX, },
1571 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1572 .attr_count = CTA_EXPECT_MAX, },
1573 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1574 .attr_count = CTA_EXPECT_MAX, },
1575};
1576
1577static struct nfnetlink_subsystem ctnl_subsys = {
1578 .name = "conntrack",
1579 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1580 .cb_count = IPCTNL_MSG_MAX,
1581 .cb = ctnl_cb,
1582};
1583
1584static struct nfnetlink_subsystem ctnl_exp_subsys = {
1585 .name = "conntrack_expect",
1586 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1587 .cb_count = IPCTNL_MSG_EXP_MAX,
1588 .cb = ctnl_exp_cb,
1589};
1590
1591MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
34f9a2e4 1592MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
c1d10adb
PNA		 1593
1594static int __init ctnetlink_init(void)
1595{
1596 int ret;
1597
1598 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1599 ret = nfnetlink_subsys_register(&ctnl_subsys);
1600 if (ret < 0) {
1601 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1602 goto err_out;
1603 }
1604
1605 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1606 if (ret < 0) {
1607 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1608 goto err_unreg_subsys;
1609 }
1610
1611#ifdef CONFIG_NF_CONNTRACK_EVENTS
1612 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1613 if (ret < 0) {
1614 printk("ctnetlink_init: cannot register notifier.\n");
1615 goto err_unreg_exp_subsys;
1616 }
1617
1618 ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp);
1619 if (ret < 0) {
1620 printk("ctnetlink_init: cannot expect register notifier.\n");
1621 goto err_unreg_notifier;
1622 }
1623#endif
1624
1625 return 0;
1626
1627#ifdef CONFIG_NF_CONNTRACK_EVENTS
1628err_unreg_notifier:
1629 nf_conntrack_unregister_notifier(&ctnl_notifier);
1630err_unreg_exp_subsys:
1631 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1632#endif
1633err_unreg_subsys:
1634 nfnetlink_subsys_unregister(&ctnl_subsys);
1635err_out:
1636 return ret;
1637}
1638
1639static void __exit ctnetlink_exit(void)
1640{
1641 printk("ctnetlink: unregistering from nfnetlink.\n");
1642
1643#ifdef CONFIG_NF_CONNTRACK_EVENTS
1644 nf_conntrack_unregister_notifier(&ctnl_notifier_exp);
1645 nf_conntrack_unregister_notifier(&ctnl_notifier);
1646#endif
1647
1648 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1649 nfnetlink_subsys_unregister(&ctnl_subsys);
1650 return;
1651}
1652
1653module_init(ctnetlink_init);
1654module_exit(ctnetlink_exit);
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