1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
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) 2005-2006 by Pablo Neira Ayuso <pablo@eurodev.net>
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.
12 * Initial connection tracking via netlink development funded and
13 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
15 * Further development of this code funded by Astaro AG (http://www.astaro.com)
17 * This software may be used and distributed according to the terms
18 * of the GNU General Public License, incorporated herein by reference.
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/interrupt.h>
31 #include <linux/notifier.h>
33 #include <linux/netfilter.h>
34 #include <linux/netfilter_ipv4/ip_conntrack.h>
35 #include <linux/netfilter_ipv4/ip_conntrack_core.h>
36 #include <linux/netfilter_ipv4/ip_conntrack_helper.h>
37 #include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
38 #include <linux/netfilter_ipv4/ip_nat_protocol.h>
40 #include <linux/netfilter/nfnetlink.h>
41 #include <linux/netfilter/nfnetlink_conntrack.h>
43 MODULE_LICENSE("GPL");
45 static char __initdata version[] = "0.90";
50 #define DEBUGP(format, args...)
55 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
56 const struct ip_conntrack_tuple *tuple,
57 struct ip_conntrack_protocol *proto)
60 struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
62 NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
64 if (likely(proto->tuple_to_nfattr))
65 ret = proto->tuple_to_nfattr(skb, tuple);
67 NFA_NEST_END(skb, nest_parms);
76 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
77 const struct ip_conntrack_tuple *tuple)
79 struct nfattr *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);
84 NFA_NEST_END(skb, nest_parms);
93 ctnetlink_dump_tuples(struct sk_buff *skb,
94 const struct ip_conntrack_tuple *tuple)
97 struct ip_conntrack_protocol *proto;
99 ret = ctnetlink_dump_tuples_ip(skb, tuple);
100 if (unlikely(ret < 0))
103 proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
104 ret = ctnetlink_dump_tuples_proto(skb, tuple, proto);
105 ip_conntrack_proto_put(proto);
111 ctnetlink_dump_status(struct sk_buff *skb, const struct ip_conntrack *ct)
113 u_int32_t status = htonl((u_int32_t) ct->status);
114 NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
122 ctnetlink_dump_timeout(struct sk_buff *skb, const struct ip_conntrack *ct)
124 long timeout_l = ct->timeout.expires - jiffies;
130 timeout = htonl(timeout_l / HZ);
132 NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
140 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
142 struct ip_conntrack_protocol *proto = ip_conntrack_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
144 struct nfattr *nest_proto;
147 if (!proto->to_nfattr) {
148 ip_conntrack_proto_put(proto);
152 nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
154 ret = proto->to_nfattr(skb, nest_proto, ct);
156 ip_conntrack_proto_put(proto);
158 NFA_NEST_END(skb, nest_proto);
167 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
169 struct nfattr *nest_helper;
174 nest_helper = NFA_NEST(skb, CTA_HELP);
175 NFA_PUT(skb, CTA_HELP_NAME, strlen(ct->helper->name), ct->helper->name);
177 if (ct->helper->to_nfattr)
178 ct->helper->to_nfattr(skb, ct);
180 NFA_NEST_END(skb, nest_helper);
188 #ifdef CONFIG_IP_NF_CT_ACCT
190 ctnetlink_dump_counters(struct sk_buff *skb, const struct ip_conntrack *ct,
191 enum ip_conntrack_dir dir)
193 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
194 struct nfattr *nest_count = NFA_NEST(skb, type);
197 tmp = htonl(ct->counters[dir].packets);
198 NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
200 tmp = htonl(ct->counters[dir].bytes);
201 NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
203 NFA_NEST_END(skb, nest_count);
211 #define ctnetlink_dump_counters(a, b, c) (0)
214 #ifdef CONFIG_IP_NF_CONNTRACK_MARK
216 ctnetlink_dump_mark(struct sk_buff *skb, const struct ip_conntrack *ct)
218 u_int32_t mark = htonl(ct->mark);
220 NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
227 #define ctnetlink_dump_mark(a, b) (0)
231 ctnetlink_dump_id(struct sk_buff *skb, const struct ip_conntrack *ct)
233 u_int32_t id = htonl(ct->id);
234 NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
242 ctnetlink_dump_use(struct sk_buff *skb, const struct ip_conntrack *ct)
244 u_int32_t use = htonl(atomic_read(&ct->ct_general.use));
246 NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
253 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
256 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
257 int event, int nowait,
258 const struct ip_conntrack *ct)
260 struct nlmsghdr *nlh;
261 struct nfgenmsg *nfmsg;
262 struct nfattr *nest_parms;
267 event |= NFNL_SUBSYS_CTNETLINK << 8;
268 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
269 nfmsg = NLMSG_DATA(nlh);
271 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
272 nfmsg->nfgen_family = AF_INET;
273 nfmsg->version = NFNETLINK_V0;
276 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
277 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
279 NFA_NEST_END(skb, nest_parms);
281 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
282 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
284 NFA_NEST_END(skb, nest_parms);
286 if (ctnetlink_dump_status(skb, ct) < 0 ||
287 ctnetlink_dump_timeout(skb, ct) < 0 ||
288 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
289 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
290 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
291 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
292 ctnetlink_dump_mark(skb, ct) < 0 ||
293 ctnetlink_dump_id(skb, ct) < 0 ||
294 ctnetlink_dump_use(skb, ct) < 0)
297 nlh->nlmsg_len = skb->tail - b;
302 skb_trim(skb, b - skb->data);
306 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
307 static int ctnetlink_conntrack_event(struct notifier_block *this,
308 unsigned long events, void *ptr)
310 struct nlmsghdr *nlh;
311 struct nfgenmsg *nfmsg;
312 struct nfattr *nest_parms;
313 struct ip_conntrack *ct = (struct ip_conntrack *)ptr;
317 unsigned int flags = 0, group;
319 /* ignore our fake conntrack entry */
320 if (ct == &ip_conntrack_untracked)
323 if (events & IPCT_DESTROY) {
324 type = IPCTNL_MSG_CT_DELETE;
325 group = NFNLGRP_CONNTRACK_DESTROY;
326 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
327 type = IPCTNL_MSG_CT_NEW;
328 flags = NLM_F_CREATE|NLM_F_EXCL;
329 /* dump everything */
331 group = NFNLGRP_CONNTRACK_NEW;
332 } else if (events & (IPCT_STATUS |
337 type = IPCTNL_MSG_CT_NEW;
338 group = NFNLGRP_CONNTRACK_UPDATE;
342 if (!nfnetlink_has_listeners(group))
345 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
351 type |= NFNL_SUBSYS_CTNETLINK << 8;
352 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
353 nfmsg = NLMSG_DATA(nlh);
355 nlh->nlmsg_flags = flags;
356 nfmsg->nfgen_family = AF_INET;
357 nfmsg->version = NFNETLINK_V0;
360 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
361 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
363 NFA_NEST_END(skb, nest_parms);
365 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
366 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
368 NFA_NEST_END(skb, nest_parms);
370 /* NAT stuff is now a status flag */
371 if ((events & IPCT_STATUS || events & IPCT_NATINFO)
372 && ctnetlink_dump_status(skb, ct) < 0)
374 if (events & IPCT_REFRESH
375 && ctnetlink_dump_timeout(skb, ct) < 0)
377 if (events & IPCT_PROTOINFO
378 && ctnetlink_dump_protoinfo(skb, ct) < 0)
380 if (events & IPCT_HELPINFO
381 && ctnetlink_dump_helpinfo(skb, ct) < 0)
384 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
385 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
388 nlh->nlmsg_len = skb->tail - b;
389 nfnetlink_send(skb, 0, group, 0);
397 #endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
399 static int ctnetlink_done(struct netlink_callback *cb)
401 DEBUGP("entered %s\n", __FUNCTION__);
403 ip_conntrack_put((struct ip_conntrack *)cb->args[1]);
408 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
410 struct ip_conntrack *ct, *last;
411 struct ip_conntrack_tuple_hash *h;
414 DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__,
417 read_lock_bh(&ip_conntrack_lock);
418 last = (struct ip_conntrack *)cb->args[1];
419 for (; cb->args[0] < ip_conntrack_htable_size; cb->args[0]++) {
421 list_for_each_prev(i, &ip_conntrack_hash[cb->args[0]]) {
422 h = (struct ip_conntrack_tuple_hash *) i;
423 if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
425 ct = tuplehash_to_ctrack(h);
431 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
435 nf_conntrack_get(&ct->ct_general);
436 cb->args[1] = (unsigned long)ct;
446 read_unlock_bh(&ip_conntrack_lock);
448 ip_conntrack_put(last);
450 DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
454 #ifdef CONFIG_IP_NF_CT_ACCT
456 ctnetlink_dump_table_w(struct sk_buff *skb, struct netlink_callback *cb)
458 struct ip_conntrack *ct = NULL;
459 struct ip_conntrack_tuple_hash *h;
461 u_int32_t *id = (u_int32_t *) &cb->args[1];
463 DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__,
466 write_lock_bh(&ip_conntrack_lock);
467 for (; cb->args[0] < ip_conntrack_htable_size; cb->args[0]++, *id = 0) {
468 list_for_each_prev(i, &ip_conntrack_hash[cb->args[0]]) {
469 h = (struct ip_conntrack_tuple_hash *) i;
470 if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
472 ct = tuplehash_to_ctrack(h);
475 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
482 memset(&ct->counters, 0, sizeof(ct->counters));
486 write_unlock_bh(&ip_conntrack_lock);
488 DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
494 static const size_t cta_min_ip[CTA_IP_MAX] = {
495 [CTA_IP_V4_SRC-1] = sizeof(u_int32_t),
496 [CTA_IP_V4_DST-1] = sizeof(u_int32_t),
500 ctnetlink_parse_tuple_ip(struct nfattr *attr, struct ip_conntrack_tuple *tuple)
502 struct nfattr *tb[CTA_IP_MAX];
504 DEBUGP("entered %s\n", __FUNCTION__);
506 nfattr_parse_nested(tb, CTA_IP_MAX, attr);
508 if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip))
511 if (!tb[CTA_IP_V4_SRC-1])
513 tuple->src.ip = *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_SRC-1]);
515 if (!tb[CTA_IP_V4_DST-1])
517 tuple->dst.ip = *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_DST-1]);
524 static const size_t cta_min_proto[CTA_PROTO_MAX] = {
525 [CTA_PROTO_NUM-1] = sizeof(u_int8_t),
526 [CTA_PROTO_SRC_PORT-1] = sizeof(u_int16_t),
527 [CTA_PROTO_DST_PORT-1] = sizeof(u_int16_t),
528 [CTA_PROTO_ICMP_TYPE-1] = sizeof(u_int8_t),
529 [CTA_PROTO_ICMP_CODE-1] = sizeof(u_int8_t),
530 [CTA_PROTO_ICMP_ID-1] = sizeof(u_int16_t),
534 ctnetlink_parse_tuple_proto(struct nfattr *attr,
535 struct ip_conntrack_tuple *tuple)
537 struct nfattr *tb[CTA_PROTO_MAX];
538 struct ip_conntrack_protocol *proto;
541 DEBUGP("entered %s\n", __FUNCTION__);
543 nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
545 if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
548 if (!tb[CTA_PROTO_NUM-1])
550 tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
552 proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
554 if (likely(proto->nfattr_to_tuple))
555 ret = proto->nfattr_to_tuple(tb, tuple);
557 ip_conntrack_proto_put(proto);
563 ctnetlink_parse_tuple(struct nfattr *cda[], struct ip_conntrack_tuple *tuple,
564 enum ctattr_tuple type)
566 struct nfattr *tb[CTA_TUPLE_MAX];
569 DEBUGP("entered %s\n", __FUNCTION__);
571 memset(tuple, 0, sizeof(*tuple));
573 nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
575 if (!tb[CTA_TUPLE_IP-1])
578 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
582 if (!tb[CTA_TUPLE_PROTO-1])
585 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
589 /* orig and expect tuples get DIR_ORIGINAL */
590 if (type == CTA_TUPLE_REPLY)
591 tuple->dst.dir = IP_CT_DIR_REPLY;
593 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
602 #ifdef CONFIG_IP_NF_NAT_NEEDED
603 static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
604 [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t),
605 [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t),
608 static int ctnetlink_parse_nat_proto(struct nfattr *attr,
609 const struct ip_conntrack *ct,
610 struct ip_nat_range *range)
612 struct nfattr *tb[CTA_PROTONAT_MAX];
613 struct ip_nat_protocol *npt;
615 DEBUGP("entered %s\n", __FUNCTION__);
617 nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
619 if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
622 npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
624 if (!npt->nfattr_to_range) {
625 ip_nat_proto_put(npt);
629 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
630 if (npt->nfattr_to_range(tb, range) > 0)
631 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
633 ip_nat_proto_put(npt);
639 static const size_t cta_min_nat[CTA_NAT_MAX] = {
640 [CTA_NAT_MINIP-1] = sizeof(u_int32_t),
641 [CTA_NAT_MAXIP-1] = sizeof(u_int32_t),
645 ctnetlink_parse_nat(struct nfattr *nat,
646 const struct ip_conntrack *ct, struct ip_nat_range *range)
648 struct nfattr *tb[CTA_NAT_MAX];
651 DEBUGP("entered %s\n", __FUNCTION__);
653 memset(range, 0, sizeof(*range));
655 nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
657 if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
660 if (tb[CTA_NAT_MINIP-1])
661 range->min_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
663 if (!tb[CTA_NAT_MAXIP-1])
664 range->max_ip = range->min_ip;
666 range->max_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
669 range->flags |= IP_NAT_RANGE_MAP_IPS;
671 if (!tb[CTA_NAT_PROTO-1])
674 err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
684 ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
686 struct nfattr *tb[CTA_HELP_MAX];
688 DEBUGP("entered %s\n", __FUNCTION__);
690 nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
692 if (!tb[CTA_HELP_NAME-1])
695 *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
700 static const size_t cta_min[CTA_MAX] = {
701 [CTA_STATUS-1] = sizeof(u_int32_t),
702 [CTA_TIMEOUT-1] = sizeof(u_int32_t),
703 [CTA_MARK-1] = sizeof(u_int32_t),
704 [CTA_USE-1] = sizeof(u_int32_t),
705 [CTA_ID-1] = sizeof(u_int32_t)
709 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
710 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
712 struct ip_conntrack_tuple_hash *h;
713 struct ip_conntrack_tuple tuple;
714 struct ip_conntrack *ct;
717 DEBUGP("entered %s\n", __FUNCTION__);
719 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
722 if (cda[CTA_TUPLE_ORIG-1])
723 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
724 else if (cda[CTA_TUPLE_REPLY-1])
725 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
727 /* Flush the whole table */
728 ip_conntrack_flush();
735 h = ip_conntrack_find_get(&tuple, NULL);
737 DEBUGP("tuple not found in conntrack hash\n");
741 ct = tuplehash_to_ctrack(h);
744 u_int32_t id = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_ID-1]));
746 ip_conntrack_put(ct);
750 if (del_timer(&ct->timeout))
751 ct->timeout.function((unsigned long)ct);
753 ip_conntrack_put(ct);
760 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
761 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
763 struct ip_conntrack_tuple_hash *h;
764 struct ip_conntrack_tuple tuple;
765 struct ip_conntrack *ct;
766 struct sk_buff *skb2 = NULL;
769 DEBUGP("entered %s\n", __FUNCTION__);
771 if (nlh->nlmsg_flags & NLM_F_DUMP) {
772 struct nfgenmsg *msg = NLMSG_DATA(nlh);
775 if (msg->nfgen_family != AF_INET)
776 return -EAFNOSUPPORT;
778 if (NFNL_MSG_TYPE(nlh->nlmsg_type) ==
779 IPCTNL_MSG_CT_GET_CTRZERO) {
780 #ifdef CONFIG_IP_NF_CT_ACCT
781 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
782 ctnetlink_dump_table_w,
783 ctnetlink_done)) != 0)
789 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
790 ctnetlink_dump_table,
791 ctnetlink_done)) != 0)
795 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
802 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
805 if (cda[CTA_TUPLE_ORIG-1])
806 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
807 else if (cda[CTA_TUPLE_REPLY-1])
808 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
815 h = ip_conntrack_find_get(&tuple, NULL);
817 DEBUGP("tuple not found in conntrack hash");
820 DEBUGP("tuple found\n");
821 ct = tuplehash_to_ctrack(h);
824 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
826 ip_conntrack_put(ct);
829 NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
831 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
832 IPCTNL_MSG_CT_NEW, 1, ct);
833 ip_conntrack_put(ct);
837 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
851 ctnetlink_change_status(struct ip_conntrack *ct, struct nfattr *cda[])
854 unsigned status = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_STATUS-1]));
855 d = ct->status ^ status;
857 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
861 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
862 /* SEEN_REPLY bit can only be set */
866 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
867 /* ASSURED bit can only be set */
870 if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
871 #ifndef CONFIG_IP_NF_NAT_NEEDED
874 struct ip_nat_range range;
876 if (cda[CTA_NAT_DST-1]) {
877 if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
880 if (ip_nat_initialized(ct,
881 HOOK2MANIP(NF_IP_PRE_ROUTING)))
883 ip_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
885 if (cda[CTA_NAT_SRC-1]) {
886 if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
889 if (ip_nat_initialized(ct,
890 HOOK2MANIP(NF_IP_POST_ROUTING)))
892 ip_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
897 /* Be careful here, modifying NAT bits can screw up things,
898 * so don't let users modify them directly if they don't pass
900 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
906 ctnetlink_change_helper(struct ip_conntrack *ct, struct nfattr *cda[])
908 struct ip_conntrack_helper *helper;
912 DEBUGP("entered %s\n", __FUNCTION__);
914 /* don't change helper of sibling connections */
918 err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
922 helper = __ip_conntrack_helper_find_byname(helpname);
924 if (!strcmp(helpname, ""))
932 /* we had a helper before ... */
933 ip_ct_remove_expectations(ct);
936 /* need to zero data of old helper */
937 memset(&ct->help, 0, sizeof(ct->help));
947 ctnetlink_change_timeout(struct ip_conntrack *ct, struct nfattr *cda[])
949 u_int32_t timeout = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
951 if (!del_timer(&ct->timeout))
954 ct->timeout.expires = jiffies + timeout * HZ;
955 add_timer(&ct->timeout);
961 ctnetlink_change_protoinfo(struct ip_conntrack *ct, struct nfattr *cda[])
963 struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
964 struct ip_conntrack_protocol *proto;
965 u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
968 nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
970 proto = ip_conntrack_proto_find_get(npt);
972 if (proto->from_nfattr)
973 err = proto->from_nfattr(tb, ct);
974 ip_conntrack_proto_put(proto);
980 ctnetlink_change_conntrack(struct ip_conntrack *ct, struct nfattr *cda[])
984 DEBUGP("entered %s\n", __FUNCTION__);
986 if (cda[CTA_HELP-1]) {
987 err = ctnetlink_change_helper(ct, cda);
992 if (cda[CTA_TIMEOUT-1]) {
993 err = ctnetlink_change_timeout(ct, cda);
998 if (cda[CTA_STATUS-1]) {
999 err = ctnetlink_change_status(ct, cda);
1004 if (cda[CTA_PROTOINFO-1]) {
1005 err = ctnetlink_change_protoinfo(ct, cda);
1010 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
1011 if (cda[CTA_MARK-1])
1012 ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
1015 DEBUGP("all done\n");
1020 ctnetlink_create_conntrack(struct nfattr *cda[],
1021 struct ip_conntrack_tuple *otuple,
1022 struct ip_conntrack_tuple *rtuple)
1024 struct ip_conntrack *ct;
1027 DEBUGP("entered %s\n", __FUNCTION__);
1029 ct = ip_conntrack_alloc(otuple, rtuple);
1030 if (ct == NULL || IS_ERR(ct))
1033 if (!cda[CTA_TIMEOUT-1])
1035 ct->timeout.expires = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
1037 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1038 ct->status |= IPS_CONFIRMED;
1040 err = ctnetlink_change_status(ct, cda);
1044 if (cda[CTA_PROTOINFO-1]) {
1045 err = ctnetlink_change_protoinfo(ct, cda);
1050 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
1051 if (cda[CTA_MARK-1])
1052 ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
1055 ct->helper = ip_conntrack_helper_find_get(rtuple);
1057 add_timer(&ct->timeout);
1058 ip_conntrack_hash_insert(ct);
1061 ip_conntrack_helper_put(ct->helper);
1063 DEBUGP("conntrack with id %u inserted\n", ct->id);
1067 ip_conntrack_free(ct);
1072 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1073 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1075 struct ip_conntrack_tuple otuple, rtuple;
1076 struct ip_conntrack_tuple_hash *h = NULL;
1079 DEBUGP("entered %s\n", __FUNCTION__);
1081 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
1084 if (cda[CTA_TUPLE_ORIG-1]) {
1085 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG);
1090 if (cda[CTA_TUPLE_REPLY-1]) {
1091 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY);
1096 write_lock_bh(&ip_conntrack_lock);
1097 if (cda[CTA_TUPLE_ORIG-1])
1098 h = __ip_conntrack_find(&otuple, NULL);
1099 else if (cda[CTA_TUPLE_REPLY-1])
1100 h = __ip_conntrack_find(&rtuple, NULL);
1103 write_unlock_bh(&ip_conntrack_lock);
1104 DEBUGP("no such conntrack, create new\n");
1106 if (nlh->nlmsg_flags & NLM_F_CREATE)
1107 err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
1110 /* implicit 'else' */
1112 /* we only allow nat config for new conntracks */
1113 if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
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");
1122 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1123 err = ctnetlink_change_conntrack(tuplehash_to_ctrack(h), cda);
1126 write_unlock_bh(&ip_conntrack_lock);
1130 /***********************************************************************
1132 ***********************************************************************/
1135 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1136 const struct ip_conntrack_tuple *tuple,
1137 enum ctattr_expect type)
1139 struct nfattr *nest_parms = NFA_NEST(skb, type);
1141 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1142 goto nfattr_failure;
1144 NFA_NEST_END(skb, nest_parms);
1153 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1154 const struct ip_conntrack_tuple *tuple,
1155 const struct ip_conntrack_tuple *mask)
1158 struct ip_conntrack_protocol *proto;
1159 struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
1161 ret = ctnetlink_dump_tuples_ip(skb, mask);
1162 if (unlikely(ret < 0))
1163 goto nfattr_failure;
1165 proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
1166 ret = ctnetlink_dump_tuples_proto(skb, mask, proto);
1167 ip_conntrack_proto_put(proto);
1168 if (unlikely(ret < 0))
1169 goto nfattr_failure;
1171 NFA_NEST_END(skb, nest_parms);
1180 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1181 const struct ip_conntrack_expect *exp)
1183 struct ip_conntrack *master = exp->master;
1184 u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1185 u_int32_t id = htonl(exp->id);
1187 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1188 goto nfattr_failure;
1189 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1190 goto nfattr_failure;
1191 if (ctnetlink_exp_dump_tuple(skb,
1192 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1193 CTA_EXPECT_MASTER) < 0)
1194 goto nfattr_failure;
1196 NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1197 NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1206 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1209 const struct ip_conntrack_expect *exp)
1211 struct nlmsghdr *nlh;
1212 struct nfgenmsg *nfmsg;
1217 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1218 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1219 nfmsg = NLMSG_DATA(nlh);
1221 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1222 nfmsg->nfgen_family = AF_INET;
1223 nfmsg->version = NFNETLINK_V0;
1226 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1227 goto nfattr_failure;
1229 nlh->nlmsg_len = skb->tail - b;
1234 skb_trim(skb, b - skb->data);
1238 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1239 static int ctnetlink_expect_event(struct notifier_block *this,
1240 unsigned long events, void *ptr)
1242 struct nlmsghdr *nlh;
1243 struct nfgenmsg *nfmsg;
1244 struct ip_conntrack_expect *exp = (struct ip_conntrack_expect *)ptr;
1245 struct sk_buff *skb;
1250 if (events & IPEXP_NEW) {
1251 type = IPCTNL_MSG_EXP_NEW;
1252 flags = NLM_F_CREATE|NLM_F_EXCL;
1256 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1262 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1263 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1264 nfmsg = NLMSG_DATA(nlh);
1266 nlh->nlmsg_flags = flags;
1267 nfmsg->nfgen_family = AF_INET;
1268 nfmsg->version = NFNETLINK_V0;
1271 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1272 goto nfattr_failure;
1274 nlh->nlmsg_len = skb->tail - b;
1275 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1286 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1288 struct ip_conntrack_expect *exp = NULL;
1289 struct list_head *i;
1290 u_int32_t *id = (u_int32_t *) &cb->args[0];
1292 DEBUGP("entered %s, last id=%llu\n", __FUNCTION__, *id);
1294 read_lock_bh(&ip_conntrack_lock);
1295 list_for_each_prev(i, &ip_conntrack_expect_list) {
1296 exp = (struct ip_conntrack_expect *) i;
1299 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1307 read_unlock_bh(&ip_conntrack_lock);
1309 DEBUGP("leaving, last id=%llu\n", *id);
1314 static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
1315 [CTA_EXPECT_TIMEOUT-1] = sizeof(u_int32_t),
1316 [CTA_EXPECT_ID-1] = sizeof(u_int32_t)
1320 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1321 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1323 struct ip_conntrack_tuple tuple;
1324 struct ip_conntrack_expect *exp;
1325 struct sk_buff *skb2;
1328 DEBUGP("entered %s\n", __FUNCTION__);
1330 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1333 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1334 struct nfgenmsg *msg = NLMSG_DATA(nlh);
1337 if (msg->nfgen_family != AF_INET)
1338 return -EAFNOSUPPORT;
1340 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
1341 ctnetlink_exp_dump_table,
1342 ctnetlink_done)) != 0)
1344 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1345 if (rlen > skb->len)
1347 skb_pull(skb, rlen);
1351 if (cda[CTA_EXPECT_MASTER-1])
1352 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER);
1359 exp = ip_conntrack_expect_find(&tuple);
1363 if (cda[CTA_EXPECT_ID-1]) {
1364 u_int32_t id = *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1365 if (exp->id != ntohl(id)) {
1366 ip_conntrack_expect_put(exp);
1372 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1375 NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
1377 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1378 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1383 ip_conntrack_expect_put(exp);
1385 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1390 ip_conntrack_expect_put(exp);
1395 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1396 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1398 struct ip_conntrack_expect *exp, *tmp;
1399 struct ip_conntrack_tuple tuple;
1400 struct ip_conntrack_helper *h;
1403 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1406 if (cda[CTA_EXPECT_TUPLE-1]) {
1407 /* delete a single expect by tuple */
1408 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1412 /* bump usage count to 2 */
1413 exp = ip_conntrack_expect_find(&tuple);
1417 if (cda[CTA_EXPECT_ID-1]) {
1419 *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1420 if (exp->id != ntohl(id)) {
1421 ip_conntrack_expect_put(exp);
1426 /* after list removal, usage count == 1 */
1427 ip_conntrack_unexpect_related(exp);
1428 /* have to put what we 'get' above.
1429 * after this line usage count == 0 */
1430 ip_conntrack_expect_put(exp);
1431 } else if (cda[CTA_EXPECT_HELP_NAME-1]) {
1432 char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
1434 /* delete all expectations for this helper */
1435 write_lock_bh(&ip_conntrack_lock);
1436 h = __ip_conntrack_helper_find_byname(name);
1438 write_unlock_bh(&ip_conntrack_lock);
1441 list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
1443 if (exp->master->helper == h
1444 && del_timer(&exp->timeout)) {
1445 ip_ct_unlink_expect(exp);
1446 ip_conntrack_expect_put(exp);
1449 write_unlock_bh(&ip_conntrack_lock);
1451 /* This basically means we have to flush everything*/
1452 write_lock_bh(&ip_conntrack_lock);
1453 list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
1455 if (del_timer(&exp->timeout)) {
1456 ip_ct_unlink_expect(exp);
1457 ip_conntrack_expect_put(exp);
1460 write_unlock_bh(&ip_conntrack_lock);
1466 ctnetlink_change_expect(struct ip_conntrack_expect *x, struct nfattr *cda[])
1472 ctnetlink_create_expect(struct nfattr *cda[])
1474 struct ip_conntrack_tuple tuple, mask, master_tuple;
1475 struct ip_conntrack_tuple_hash *h = NULL;
1476 struct ip_conntrack_expect *exp;
1477 struct ip_conntrack *ct;
1480 DEBUGP("entered %s\n", __FUNCTION__);
1482 /* caller guarantees that those three CTA_EXPECT_* exist */
1483 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1486 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK);
1489 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER);
1493 /* Look for master conntrack of this expectation */
1494 h = ip_conntrack_find_get(&master_tuple, NULL);
1497 ct = tuplehash_to_ctrack(h);
1500 /* such conntrack hasn't got any helper, abort */
1505 exp = ip_conntrack_expect_alloc(ct);
1511 exp->expectfn = NULL;
1514 memcpy(&exp->tuple, &tuple, sizeof(struct ip_conntrack_tuple));
1515 memcpy(&exp->mask, &mask, sizeof(struct ip_conntrack_tuple));
1517 err = ip_conntrack_expect_related(exp);
1518 ip_conntrack_expect_put(exp);
1521 ip_conntrack_put(tuplehash_to_ctrack(h));
1526 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1527 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1529 struct ip_conntrack_tuple tuple;
1530 struct ip_conntrack_expect *exp;
1533 DEBUGP("entered %s\n", __FUNCTION__);
1535 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1538 if (!cda[CTA_EXPECT_TUPLE-1]
1539 || !cda[CTA_EXPECT_MASK-1]
1540 || !cda[CTA_EXPECT_MASTER-1])
1543 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1547 write_lock_bh(&ip_conntrack_lock);
1548 exp = __ip_conntrack_expect_find(&tuple);
1551 write_unlock_bh(&ip_conntrack_lock);
1553 if (nlh->nlmsg_flags & NLM_F_CREATE)
1554 err = ctnetlink_create_expect(cda);
1559 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1560 err = ctnetlink_change_expect(exp, cda);
1561 write_unlock_bh(&ip_conntrack_lock);
1563 DEBUGP("leaving\n");
1568 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1569 static struct notifier_block ctnl_notifier = {
1570 .notifier_call = ctnetlink_conntrack_event,
1573 static struct notifier_block ctnl_notifier_exp = {
1574 .notifier_call = ctnetlink_expect_event,
1578 static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1579 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1580 .attr_count = CTA_MAX, },
1581 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1582 .attr_count = CTA_MAX, },
1583 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1584 .attr_count = CTA_MAX, },
1585 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1586 .attr_count = CTA_MAX, },
1589 static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1590 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1591 .attr_count = CTA_EXPECT_MAX, },
1592 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1593 .attr_count = CTA_EXPECT_MAX, },
1594 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1595 .attr_count = CTA_EXPECT_MAX, },
1598 static struct nfnetlink_subsystem ctnl_subsys = {
1599 .name = "conntrack",
1600 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1601 .cb_count = IPCTNL_MSG_MAX,
1605 static struct nfnetlink_subsystem ctnl_exp_subsys = {
1606 .name = "conntrack_expect",
1607 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1608 .cb_count = IPCTNL_MSG_EXP_MAX,
1612 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1613 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1615 static int __init ctnetlink_init(void)
1619 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1620 ret = nfnetlink_subsys_register(&ctnl_subsys);
1622 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1626 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1628 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1629 goto err_unreg_subsys;
1632 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1633 ret = ip_conntrack_register_notifier(&ctnl_notifier);
1635 printk("ctnetlink_init: cannot register notifier.\n");
1636 goto err_unreg_exp_subsys;
1639 ret = ip_conntrack_expect_register_notifier(&ctnl_notifier_exp);
1641 printk("ctnetlink_init: cannot expect register notifier.\n");
1642 goto err_unreg_notifier;
1648 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1650 ip_conntrack_unregister_notifier(&ctnl_notifier);
1651 err_unreg_exp_subsys:
1652 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1655 nfnetlink_subsys_unregister(&ctnl_subsys);
1660 static void __exit ctnetlink_exit(void)
1662 printk("ctnetlink: unregistering from nfnetlink.\n");
1664 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1665 ip_conntrack_expect_unregister_notifier(&ctnl_notifier_exp);
1666 ip_conntrack_unregister_notifier(&ctnl_notifier);
1669 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1670 nfnetlink_subsys_unregister(&ctnl_subsys);
1674 module_init(ctnetlink_init);
1675 module_exit(ctnetlink_exit);