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) 2002-2006 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.
20 * Derived from ip_conntrack_netlink.c: Port by Pablo Neira Ayuso (05/11/14)
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/interrupt.h>
33 #include <linux/notifier.h>
35 #include <linux/netfilter.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_core.h>
38 #include <net/netfilter/nf_conntrack_helper.h>
39 #include <net/netfilter/nf_conntrack_l3proto.h>
40 #include <net/netfilter/nf_conntrack_protocol.h>
41 #include <linux/netfilter_ipv4/ip_nat_protocol.h>
43 #include <linux/netfilter/nfnetlink.h>
44 #include <linux/netfilter/nfnetlink_conntrack.h>
46 MODULE_LICENSE("GPL");
48 static char __initdata version[] = "0.93";
53 #define DEBUGP(format, args...)
58 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
59 const struct nf_conntrack_tuple *tuple,
60 struct nf_conntrack_protocol *proto)
63 struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
65 NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
67 if (likely(proto->tuple_to_nfattr))
68 ret = proto->tuple_to_nfattr(skb, tuple);
70 NFA_NEST_END(skb, nest_parms);
79 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
80 const struct nf_conntrack_tuple *tuple,
81 struct nf_conntrack_l3proto *l3proto)
84 struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
86 if (likely(l3proto->tuple_to_nfattr))
87 ret = l3proto->tuple_to_nfattr(skb, tuple);
89 NFA_NEST_END(skb, nest_parms);
98 ctnetlink_dump_tuples(struct sk_buff *skb,
99 const struct nf_conntrack_tuple *tuple)
102 struct nf_conntrack_l3proto *l3proto;
103 struct nf_conntrack_protocol *proto;
105 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
106 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
107 nf_ct_l3proto_put(l3proto);
109 if (unlikely(ret < 0))
112 proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
113 ret = ctnetlink_dump_tuples_proto(skb, tuple, proto);
114 nf_ct_proto_put(proto);
120 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
122 u_int32_t status = htonl((u_int32_t) ct->status);
123 NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
131 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
133 long timeout_l = ct->timeout.expires - jiffies;
139 timeout = htonl(timeout_l / HZ);
141 NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
149 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
151 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);
152 struct nfattr *nest_proto;
155 if (!proto->to_nfattr) {
156 nf_ct_proto_put(proto);
160 nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
162 ret = proto->to_nfattr(skb, nest_proto, ct);
164 nf_ct_proto_put(proto);
166 NFA_NEST_END(skb, nest_proto);
175 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
177 struct nfattr *nest_helper;
178 const struct nf_conn_help *help = nfct_help(ct);
180 if (!help || !help->helper)
183 nest_helper = NFA_NEST(skb, CTA_HELP);
184 NFA_PUT(skb, CTA_HELP_NAME, strlen(help->helper->name), help->helper->name);
186 if (help->helper->to_nfattr)
187 help->helper->to_nfattr(skb, ct);
189 NFA_NEST_END(skb, nest_helper);
197 #ifdef CONFIG_NF_CT_ACCT
199 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
200 enum ip_conntrack_dir dir)
202 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
203 struct nfattr *nest_count = NFA_NEST(skb, type);
206 tmp = htonl(ct->counters[dir].packets);
207 NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
209 tmp = htonl(ct->counters[dir].bytes);
210 NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
212 NFA_NEST_END(skb, nest_count);
220 #define ctnetlink_dump_counters(a, b, c) (0)
223 #ifdef CONFIG_NF_CONNTRACK_MARK
225 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
227 u_int32_t mark = htonl(ct->mark);
229 NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
236 #define ctnetlink_dump_mark(a, b) (0)
240 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
242 u_int32_t id = htonl(ct->id);
243 NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
251 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
253 u_int32_t use = htonl(atomic_read(&ct->ct_general.use));
255 NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
262 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
265 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
266 int event, int nowait,
267 const struct nf_conn *ct)
269 struct nlmsghdr *nlh;
270 struct nfgenmsg *nfmsg;
271 struct nfattr *nest_parms;
276 event |= NFNL_SUBSYS_CTNETLINK << 8;
277 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
278 nfmsg = NLMSG_DATA(nlh);
280 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
281 nfmsg->nfgen_family =
282 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
283 nfmsg->version = NFNETLINK_V0;
286 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
287 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
289 NFA_NEST_END(skb, nest_parms);
291 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
292 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
294 NFA_NEST_END(skb, nest_parms);
296 if (ctnetlink_dump_status(skb, ct) < 0 ||
297 ctnetlink_dump_timeout(skb, ct) < 0 ||
298 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
299 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
300 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
301 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
302 ctnetlink_dump_mark(skb, ct) < 0 ||
303 ctnetlink_dump_id(skb, ct) < 0 ||
304 ctnetlink_dump_use(skb, ct) < 0)
307 nlh->nlmsg_len = skb->tail - b;
312 skb_trim(skb, b - skb->data);
316 #ifdef CONFIG_NF_CONNTRACK_EVENTS
317 static int ctnetlink_conntrack_event(struct notifier_block *this,
318 unsigned long events, void *ptr)
320 struct nlmsghdr *nlh;
321 struct nfgenmsg *nfmsg;
322 struct nfattr *nest_parms;
323 struct nf_conn *ct = (struct nf_conn *)ptr;
327 unsigned int flags = 0, group;
329 /* ignore our fake conntrack entry */
330 if (ct == &nf_conntrack_untracked)
333 if (events & IPCT_DESTROY) {
334 type = IPCTNL_MSG_CT_DELETE;
335 group = NFNLGRP_CONNTRACK_DESTROY;
336 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
337 type = IPCTNL_MSG_CT_NEW;
338 flags = NLM_F_CREATE|NLM_F_EXCL;
339 /* dump everything */
341 group = NFNLGRP_CONNTRACK_NEW;
342 } else if (events & (IPCT_STATUS |
347 type = IPCTNL_MSG_CT_NEW;
348 group = NFNLGRP_CONNTRACK_UPDATE;
352 if (!nfnetlink_has_listeners(group))
355 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
361 type |= NFNL_SUBSYS_CTNETLINK << 8;
362 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
363 nfmsg = NLMSG_DATA(nlh);
365 nlh->nlmsg_flags = flags;
366 nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
367 nfmsg->version = NFNETLINK_V0;
370 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
371 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
373 NFA_NEST_END(skb, nest_parms);
375 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
376 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
378 NFA_NEST_END(skb, nest_parms);
380 /* NAT stuff is now a status flag */
381 if ((events & IPCT_STATUS || events & IPCT_NATINFO)
382 && ctnetlink_dump_status(skb, ct) < 0)
384 if (events & IPCT_REFRESH
385 && ctnetlink_dump_timeout(skb, ct) < 0)
387 if (events & IPCT_PROTOINFO
388 && ctnetlink_dump_protoinfo(skb, ct) < 0)
390 if (events & IPCT_HELPINFO
391 && ctnetlink_dump_helpinfo(skb, ct) < 0)
394 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
395 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
398 nlh->nlmsg_len = skb->tail - b;
399 nfnetlink_send(skb, 0, group, 0);
407 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
409 static int ctnetlink_done(struct netlink_callback *cb)
412 nf_ct_put((struct nf_conn *)cb->args[1]);
413 DEBUGP("entered %s\n", __FUNCTION__);
417 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
420 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
422 struct nf_conn *ct, *last;
423 struct nf_conntrack_tuple_hash *h;
425 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
426 u_int8_t l3proto = nfmsg->nfgen_family;
428 DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__,
431 read_lock_bh(&nf_conntrack_lock);
432 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
434 last = (struct nf_conn *)cb->args[1];
435 list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
436 h = (struct nf_conntrack_tuple_hash *) i;
437 if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
439 ct = nf_ct_tuplehash_to_ctrack(h);
440 /* Dump entries of a given L3 protocol number.
441 * If it is not specified, ie. l3proto == 0,
442 * then dump everything. */
443 if (l3proto && L3PROTO(ct) != l3proto)
453 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
457 nf_conntrack_get(&ct->ct_general);
458 cb->args[1] = (unsigned long)ct;
469 read_unlock_bh(&nf_conntrack_lock);
471 DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
476 #ifdef CONFIG_NF_CT_ACCT
478 ctnetlink_dump_table_w(struct sk_buff *skb, struct netlink_callback *cb)
480 struct nf_conn *ct = NULL;
481 struct nf_conntrack_tuple_hash *h;
483 u_int32_t *id = (u_int32_t *) &cb->args[1];
484 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
485 u_int8_t l3proto = nfmsg->nfgen_family;
487 DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__,
490 write_lock_bh(&nf_conntrack_lock);
491 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++, *id = 0) {
492 list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
493 h = (struct nf_conntrack_tuple_hash *) i;
494 if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
496 ct = nf_ct_tuplehash_to_ctrack(h);
497 if (l3proto && L3PROTO(ct) != l3proto)
501 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
508 memset(&ct->counters, 0, sizeof(ct->counters));
512 write_unlock_bh(&nf_conntrack_lock);
514 DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
521 ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple)
523 struct nfattr *tb[CTA_IP_MAX];
524 struct nf_conntrack_l3proto *l3proto;
527 DEBUGP("entered %s\n", __FUNCTION__);
529 nfattr_parse_nested(tb, CTA_IP_MAX, attr);
531 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
533 if (likely(l3proto->nfattr_to_tuple))
534 ret = l3proto->nfattr_to_tuple(tb, tuple);
536 nf_ct_l3proto_put(l3proto);
543 static const size_t cta_min_proto[CTA_PROTO_MAX] = {
544 [CTA_PROTO_NUM-1] = sizeof(u_int8_t),
548 ctnetlink_parse_tuple_proto(struct nfattr *attr,
549 struct nf_conntrack_tuple *tuple)
551 struct nfattr *tb[CTA_PROTO_MAX];
552 struct nf_conntrack_protocol *proto;
555 DEBUGP("entered %s\n", __FUNCTION__);
557 nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
559 if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
562 if (!tb[CTA_PROTO_NUM-1])
564 tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
566 proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
568 if (likely(proto->nfattr_to_tuple))
569 ret = proto->nfattr_to_tuple(tb, tuple);
571 nf_ct_proto_put(proto);
577 ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple,
578 enum ctattr_tuple type, u_int8_t l3num)
580 struct nfattr *tb[CTA_TUPLE_MAX];
583 DEBUGP("entered %s\n", __FUNCTION__);
585 memset(tuple, 0, sizeof(*tuple));
587 nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
589 if (!tb[CTA_TUPLE_IP-1])
592 tuple->src.l3num = l3num;
594 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
598 if (!tb[CTA_TUPLE_PROTO-1])
601 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
605 /* orig and expect tuples get DIR_ORIGINAL */
606 if (type == CTA_TUPLE_REPLY)
607 tuple->dst.dir = IP_CT_DIR_REPLY;
609 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
611 NF_CT_DUMP_TUPLE(tuple);
618 #ifdef CONFIG_IP_NF_NAT_NEEDED
619 static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
620 [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t),
621 [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t),
624 static int ctnetlink_parse_nat_proto(struct nfattr *attr,
625 const struct nf_conn *ct,
626 struct ip_nat_range *range)
628 struct nfattr *tb[CTA_PROTONAT_MAX];
629 struct ip_nat_protocol *npt;
631 DEBUGP("entered %s\n", __FUNCTION__);
633 nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
635 if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
638 npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
640 if (!npt->nfattr_to_range) {
641 ip_nat_proto_put(npt);
645 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
646 if (npt->nfattr_to_range(tb, range) > 0)
647 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
649 ip_nat_proto_put(npt);
655 static const size_t cta_min_nat[CTA_NAT_MAX] = {
656 [CTA_NAT_MINIP-1] = sizeof(u_int32_t),
657 [CTA_NAT_MAXIP-1] = sizeof(u_int32_t),
661 ctnetlink_parse_nat(struct nfattr *nat,
662 const struct nf_conn *ct, struct ip_nat_range *range)
664 struct nfattr *tb[CTA_NAT_MAX];
667 DEBUGP("entered %s\n", __FUNCTION__);
669 memset(range, 0, sizeof(*range));
671 nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
673 if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
676 if (tb[CTA_NAT_MINIP-1])
677 range->min_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
679 if (!tb[CTA_NAT_MAXIP-1])
680 range->max_ip = range->min_ip;
682 range->max_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
685 range->flags |= IP_NAT_RANGE_MAP_IPS;
687 if (!tb[CTA_NAT_PROTO-1])
690 err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
700 ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
702 struct nfattr *tb[CTA_HELP_MAX];
704 DEBUGP("entered %s\n", __FUNCTION__);
706 nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
708 if (!tb[CTA_HELP_NAME-1])
711 *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
716 static const size_t cta_min[CTA_MAX] = {
717 [CTA_STATUS-1] = sizeof(u_int32_t),
718 [CTA_TIMEOUT-1] = sizeof(u_int32_t),
719 [CTA_MARK-1] = sizeof(u_int32_t),
720 [CTA_USE-1] = sizeof(u_int32_t),
721 [CTA_ID-1] = sizeof(u_int32_t)
725 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
726 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
728 struct nf_conntrack_tuple_hash *h;
729 struct nf_conntrack_tuple tuple;
731 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
732 u_int8_t u3 = nfmsg->nfgen_family;
735 DEBUGP("entered %s\n", __FUNCTION__);
737 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
740 if (cda[CTA_TUPLE_ORIG-1])
741 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
742 else if (cda[CTA_TUPLE_REPLY-1])
743 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
745 /* Flush the whole table */
746 nf_conntrack_flush();
753 h = nf_conntrack_find_get(&tuple, NULL);
755 DEBUGP("tuple not found in conntrack hash\n");
759 ct = nf_ct_tuplehash_to_ctrack(h);
762 u_int32_t id = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_ID-1]));
768 if (del_timer(&ct->timeout))
769 ct->timeout.function((unsigned long)ct);
778 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
779 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
781 struct nf_conntrack_tuple_hash *h;
782 struct nf_conntrack_tuple tuple;
784 struct sk_buff *skb2 = NULL;
785 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
786 u_int8_t u3 = nfmsg->nfgen_family;
789 DEBUGP("entered %s\n", __FUNCTION__);
791 if (nlh->nlmsg_flags & NLM_F_DUMP) {
794 if (NFNL_MSG_TYPE(nlh->nlmsg_type) ==
795 IPCTNL_MSG_CT_GET_CTRZERO) {
796 #ifdef CONFIG_NF_CT_ACCT
797 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
798 ctnetlink_dump_table_w,
799 ctnetlink_done)) != 0)
805 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
806 ctnetlink_dump_table,
807 ctnetlink_done)) != 0)
811 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
818 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
821 if (cda[CTA_TUPLE_ORIG-1])
822 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
823 else if (cda[CTA_TUPLE_REPLY-1])
824 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
831 h = nf_conntrack_find_get(&tuple, NULL);
833 DEBUGP("tuple not found in conntrack hash");
836 DEBUGP("tuple found\n");
837 ct = nf_ct_tuplehash_to_ctrack(h);
840 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
845 NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
847 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
848 IPCTNL_MSG_CT_NEW, 1, ct);
853 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
867 ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[])
870 unsigned status = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_STATUS-1]));
871 d = ct->status ^ status;
873 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
877 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
878 /* SEEN_REPLY bit can only be set */
882 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
883 /* ASSURED bit can only be set */
886 if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
887 #ifndef CONFIG_IP_NF_NAT_NEEDED
890 struct ip_nat_range range;
892 if (cda[CTA_NAT_DST-1]) {
893 if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
896 if (ip_nat_initialized(ct,
897 HOOK2MANIP(NF_IP_PRE_ROUTING)))
899 ip_nat_setup_info(ct, &range, hooknum);
901 if (cda[CTA_NAT_SRC-1]) {
902 if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
905 if (ip_nat_initialized(ct,
906 HOOK2MANIP(NF_IP_POST_ROUTING)))
908 ip_nat_setup_info(ct, &range, hooknum);
913 /* Be careful here, modifying NAT bits can screw up things,
914 * so don't let users modify them directly if they don't pass
916 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
922 ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[])
924 struct nf_conntrack_helper *helper;
925 struct nf_conn_help *help = nfct_help(ct);
929 DEBUGP("entered %s\n", __FUNCTION__);
932 /* FIXME: we need to reallocate and rehash */
936 /* don't change helper of sibling connections */
940 err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
944 helper = __nf_conntrack_helper_find_byname(helpname);
946 if (!strcmp(helpname, ""))
954 /* we had a helper before ... */
955 nf_ct_remove_expectations(ct);
958 /* need to zero data of old helper */
959 memset(&help->help, 0, sizeof(help->help));
963 help->helper = helper;
969 ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[])
971 u_int32_t timeout = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
973 if (!del_timer(&ct->timeout))
976 ct->timeout.expires = jiffies + timeout * HZ;
977 add_timer(&ct->timeout);
983 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[])
985 struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
986 struct nf_conntrack_protocol *proto;
987 u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
988 u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
991 nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
993 proto = nf_ct_proto_find_get(l3num, npt);
995 if (proto->from_nfattr)
996 err = proto->from_nfattr(tb, ct);
997 nf_ct_proto_put(proto);
1003 ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[])
1007 DEBUGP("entered %s\n", __FUNCTION__);
1009 if (cda[CTA_HELP-1]) {
1010 err = ctnetlink_change_helper(ct, cda);
1015 if (cda[CTA_TIMEOUT-1]) {
1016 err = ctnetlink_change_timeout(ct, cda);
1021 if (cda[CTA_STATUS-1]) {
1022 err = ctnetlink_change_status(ct, cda);
1027 if (cda[CTA_PROTOINFO-1]) {
1028 err = ctnetlink_change_protoinfo(ct, cda);
1033 #if defined(CONFIG_NF_CONNTRACK_MARK)
1034 if (cda[CTA_MARK-1])
1035 ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
1038 DEBUGP("all done\n");
1043 ctnetlink_create_conntrack(struct nfattr *cda[],
1044 struct nf_conntrack_tuple *otuple,
1045 struct nf_conntrack_tuple *rtuple)
1050 DEBUGP("entered %s\n", __FUNCTION__);
1052 ct = nf_conntrack_alloc(otuple, rtuple);
1053 if (ct == NULL || IS_ERR(ct))
1056 if (!cda[CTA_TIMEOUT-1])
1058 ct->timeout.expires = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
1060 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1061 ct->status |= IPS_CONFIRMED;
1063 err = ctnetlink_change_status(ct, cda);
1067 if (cda[CTA_PROTOINFO-1]) {
1068 err = ctnetlink_change_protoinfo(ct, cda);
1073 #if defined(CONFIG_NF_CONNTRACK_MARK)
1074 if (cda[CTA_MARK-1])
1075 ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
1078 add_timer(&ct->timeout);
1079 nf_conntrack_hash_insert(ct);
1081 DEBUGP("conntrack with id %u inserted\n", ct->id);
1085 nf_conntrack_free(ct);
1090 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1091 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1093 struct nf_conntrack_tuple otuple, rtuple;
1094 struct nf_conntrack_tuple_hash *h = NULL;
1095 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1096 u_int8_t u3 = nfmsg->nfgen_family;
1099 DEBUGP("entered %s\n", __FUNCTION__);
1101 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
1104 if (cda[CTA_TUPLE_ORIG-1]) {
1105 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1110 if (cda[CTA_TUPLE_REPLY-1]) {
1111 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1116 write_lock_bh(&nf_conntrack_lock);
1117 if (cda[CTA_TUPLE_ORIG-1])
1118 h = __nf_conntrack_find(&otuple, NULL);
1119 else if (cda[CTA_TUPLE_REPLY-1])
1120 h = __nf_conntrack_find(&rtuple, NULL);
1123 write_unlock_bh(&nf_conntrack_lock);
1124 DEBUGP("no such conntrack, create new\n");
1126 if (nlh->nlmsg_flags & NLM_F_CREATE)
1127 err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
1130 /* implicit 'else' */
1132 /* we only allow nat config for new conntracks */
1133 if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
1138 /* We manipulate the conntrack inside the global conntrack table lock,
1139 * so there's no need to increase the refcount */
1140 DEBUGP("conntrack found\n");
1142 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1143 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda);
1146 write_unlock_bh(&nf_conntrack_lock);
1150 /***********************************************************************
1152 ***********************************************************************/
1155 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1156 const struct nf_conntrack_tuple *tuple,
1157 enum ctattr_expect type)
1159 struct nfattr *nest_parms = NFA_NEST(skb, type);
1161 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1162 goto nfattr_failure;
1164 NFA_NEST_END(skb, nest_parms);
1173 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1174 const struct nf_conntrack_tuple *tuple,
1175 const struct nf_conntrack_tuple *mask)
1178 struct nf_conntrack_l3proto *l3proto;
1179 struct nf_conntrack_protocol *proto;
1180 struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
1182 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1183 ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto);
1184 nf_ct_l3proto_put(l3proto);
1186 if (unlikely(ret < 0))
1187 goto nfattr_failure;
1189 proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1190 ret = ctnetlink_dump_tuples_proto(skb, mask, proto);
1191 nf_ct_proto_put(proto);
1192 if (unlikely(ret < 0))
1193 goto nfattr_failure;
1195 NFA_NEST_END(skb, nest_parms);
1204 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1205 const struct nf_conntrack_expect *exp)
1207 struct nf_conn *master = exp->master;
1208 u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1209 u_int32_t id = htonl(exp->id);
1211 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1212 goto nfattr_failure;
1213 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1214 goto nfattr_failure;
1215 if (ctnetlink_exp_dump_tuple(skb,
1216 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1217 CTA_EXPECT_MASTER) < 0)
1218 goto nfattr_failure;
1220 NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1221 NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1230 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1233 const struct nf_conntrack_expect *exp)
1235 struct nlmsghdr *nlh;
1236 struct nfgenmsg *nfmsg;
1241 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1242 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1243 nfmsg = NLMSG_DATA(nlh);
1245 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1246 nfmsg->nfgen_family = exp->tuple.src.l3num;
1247 nfmsg->version = NFNETLINK_V0;
1250 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1251 goto nfattr_failure;
1253 nlh->nlmsg_len = skb->tail - b;
1258 skb_trim(skb, b - skb->data);
1262 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1263 static int ctnetlink_expect_event(struct notifier_block *this,
1264 unsigned long events, void *ptr)
1266 struct nlmsghdr *nlh;
1267 struct nfgenmsg *nfmsg;
1268 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1269 struct sk_buff *skb;
1274 if (events & IPEXP_NEW) {
1275 type = IPCTNL_MSG_EXP_NEW;
1276 flags = NLM_F_CREATE|NLM_F_EXCL;
1280 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1286 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1287 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1288 nfmsg = NLMSG_DATA(nlh);
1290 nlh->nlmsg_flags = flags;
1291 nfmsg->nfgen_family = exp->tuple.src.l3num;
1292 nfmsg->version = NFNETLINK_V0;
1295 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1296 goto nfattr_failure;
1298 nlh->nlmsg_len = skb->tail - b;
1299 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1310 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1312 struct nf_conntrack_expect *exp = NULL;
1313 struct list_head *i;
1314 u_int32_t *id = (u_int32_t *) &cb->args[0];
1315 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1316 u_int8_t l3proto = nfmsg->nfgen_family;
1318 DEBUGP("entered %s, last id=%llu\n", __FUNCTION__, *id);
1320 read_lock_bh(&nf_conntrack_lock);
1321 list_for_each_prev(i, &nf_conntrack_expect_list) {
1322 exp = (struct nf_conntrack_expect *) i;
1323 if (l3proto && exp->tuple.src.l3num != l3proto)
1327 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1335 read_unlock_bh(&nf_conntrack_lock);
1337 DEBUGP("leaving, last id=%llu\n", *id);
1342 static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
1343 [CTA_EXPECT_TIMEOUT-1] = sizeof(u_int32_t),
1344 [CTA_EXPECT_ID-1] = sizeof(u_int32_t)
1348 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1349 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1351 struct nf_conntrack_tuple tuple;
1352 struct nf_conntrack_expect *exp;
1353 struct sk_buff *skb2;
1354 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1355 u_int8_t u3 = nfmsg->nfgen_family;
1358 DEBUGP("entered %s\n", __FUNCTION__);
1360 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1363 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1366 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
1367 ctnetlink_exp_dump_table,
1368 ctnetlink_done)) != 0)
1370 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1371 if (rlen > skb->len)
1373 skb_pull(skb, rlen);
1377 if (cda[CTA_EXPECT_MASTER-1])
1378 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1385 exp = nf_conntrack_expect_find(&tuple);
1389 if (cda[CTA_EXPECT_ID-1]) {
1390 u_int32_t id = *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1391 if (exp->id != ntohl(id)) {
1392 nf_conntrack_expect_put(exp);
1398 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1401 NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
1403 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1404 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1409 nf_conntrack_expect_put(exp);
1411 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1416 nf_conntrack_expect_put(exp);
1421 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1422 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1424 struct nf_conntrack_expect *exp, *tmp;
1425 struct nf_conntrack_tuple tuple;
1426 struct nf_conntrack_helper *h;
1427 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1428 u_int8_t u3 = nfmsg->nfgen_family;
1431 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1434 if (cda[CTA_EXPECT_TUPLE-1]) {
1435 /* delete a single expect by tuple */
1436 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1440 /* bump usage count to 2 */
1441 exp = nf_conntrack_expect_find(&tuple);
1445 if (cda[CTA_EXPECT_ID-1]) {
1447 *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1448 if (exp->id != ntohl(id)) {
1449 nf_conntrack_expect_put(exp);
1454 /* after list removal, usage count == 1 */
1455 nf_conntrack_unexpect_related(exp);
1456 /* have to put what we 'get' above.
1457 * after this line usage count == 0 */
1458 nf_conntrack_expect_put(exp);
1459 } else if (cda[CTA_EXPECT_HELP_NAME-1]) {
1460 char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
1462 /* delete all expectations for this helper */
1463 write_lock_bh(&nf_conntrack_lock);
1464 h = __nf_conntrack_helper_find_byname(name);
1466 write_unlock_bh(&nf_conntrack_lock);
1469 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1471 struct nf_conn_help *m_help = nfct_help(exp->master);
1472 if (m_help->helper == h
1473 && del_timer(&exp->timeout)) {
1474 nf_ct_unlink_expect(exp);
1475 nf_conntrack_expect_put(exp);
1478 write_unlock_bh(&nf_conntrack_lock);
1480 /* This basically means we have to flush everything*/
1481 write_lock_bh(&nf_conntrack_lock);
1482 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1484 if (del_timer(&exp->timeout)) {
1485 nf_ct_unlink_expect(exp);
1486 nf_conntrack_expect_put(exp);
1489 write_unlock_bh(&nf_conntrack_lock);
1495 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[])
1501 ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3)
1503 struct nf_conntrack_tuple tuple, mask, master_tuple;
1504 struct nf_conntrack_tuple_hash *h = NULL;
1505 struct nf_conntrack_expect *exp;
1507 struct nf_conn_help *help;
1510 DEBUGP("entered %s\n", __FUNCTION__);
1512 /* caller guarantees that those three CTA_EXPECT_* exist */
1513 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1516 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1519 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1523 /* Look for master conntrack of this expectation */
1524 h = nf_conntrack_find_get(&master_tuple, NULL);
1527 ct = nf_ct_tuplehash_to_ctrack(h);
1528 help = nfct_help(ct);
1530 if (!help || !help->helper) {
1531 /* such conntrack hasn't got any helper, abort */
1536 exp = nf_conntrack_expect_alloc(ct);
1542 exp->expectfn = NULL;
1545 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1546 memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple));
1548 err = nf_conntrack_expect_related(exp);
1549 nf_conntrack_expect_put(exp);
1552 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1557 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1558 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1560 struct nf_conntrack_tuple tuple;
1561 struct nf_conntrack_expect *exp;
1562 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1563 u_int8_t u3 = nfmsg->nfgen_family;
1566 DEBUGP("entered %s\n", __FUNCTION__);
1568 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1571 if (!cda[CTA_EXPECT_TUPLE-1]
1572 || !cda[CTA_EXPECT_MASK-1]
1573 || !cda[CTA_EXPECT_MASTER-1])
1576 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1580 write_lock_bh(&nf_conntrack_lock);
1581 exp = __nf_conntrack_expect_find(&tuple);
1584 write_unlock_bh(&nf_conntrack_lock);
1586 if (nlh->nlmsg_flags & NLM_F_CREATE)
1587 err = ctnetlink_create_expect(cda, u3);
1592 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1593 err = ctnetlink_change_expect(exp, cda);
1594 write_unlock_bh(&nf_conntrack_lock);
1596 DEBUGP("leaving\n");
1601 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1602 static struct notifier_block ctnl_notifier = {
1603 .notifier_call = ctnetlink_conntrack_event,
1606 static struct notifier_block ctnl_notifier_exp = {
1607 .notifier_call = ctnetlink_expect_event,
1611 static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1612 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1613 .attr_count = CTA_MAX, },
1614 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1615 .attr_count = CTA_MAX, },
1616 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1617 .attr_count = CTA_MAX, },
1618 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1619 .attr_count = CTA_MAX, },
1622 static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1623 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1624 .attr_count = CTA_EXPECT_MAX, },
1625 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1626 .attr_count = CTA_EXPECT_MAX, },
1627 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1628 .attr_count = CTA_EXPECT_MAX, },
1631 static struct nfnetlink_subsystem ctnl_subsys = {
1632 .name = "conntrack",
1633 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1634 .cb_count = IPCTNL_MSG_MAX,
1638 static struct nfnetlink_subsystem ctnl_exp_subsys = {
1639 .name = "conntrack_expect",
1640 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1641 .cb_count = IPCTNL_MSG_EXP_MAX,
1645 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1646 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1648 static int __init ctnetlink_init(void)
1652 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1653 ret = nfnetlink_subsys_register(&ctnl_subsys);
1655 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1659 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1661 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1662 goto err_unreg_subsys;
1665 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1666 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1668 printk("ctnetlink_init: cannot register notifier.\n");
1669 goto err_unreg_exp_subsys;
1672 ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp);
1674 printk("ctnetlink_init: cannot expect register notifier.\n");
1675 goto err_unreg_notifier;
1681 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1683 nf_conntrack_unregister_notifier(&ctnl_notifier);
1684 err_unreg_exp_subsys:
1685 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1688 nfnetlink_subsys_unregister(&ctnl_subsys);
1693 static void __exit ctnetlink_exit(void)
1695 printk("ctnetlink: unregistering from nfnetlink.\n");
1697 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1698 nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp);
1699 nf_conntrack_unregister_notifier(&ctnl_notifier);
1702 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1703 nfnetlink_subsys_unregister(&ctnl_subsys);
1707 module_init(ctnetlink_init);
1708 module_exit(ctnetlink_exit);