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) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org>
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/types.h>
23 #include <linux/timer.h>
24 #include <linux/skbuff.h>
25 #include <linux/errno.h>
26 #include <linux/netlink.h>
27 #include <linux/spinlock.h>
28 #include <linux/interrupt.h>
29 #include <linux/notifier.h>
31 #include <linux/netfilter.h>
32 #include <net/netlink.h>
33 #include <net/netfilter/nf_conntrack.h>
34 #include <net/netfilter/nf_conntrack_core.h>
35 #include <net/netfilter/nf_conntrack_expect.h>
36 #include <net/netfilter/nf_conntrack_helper.h>
37 #include <net/netfilter/nf_conntrack_l3proto.h>
38 #include <net/netfilter/nf_conntrack_l4proto.h>
39 #include <net/netfilter/nf_conntrack_tuple.h>
40 #include <net/netfilter/nf_conntrack_acct.h>
41 #ifdef CONFIG_NF_NAT_NEEDED
42 #include <net/netfilter/nf_nat_core.h>
43 #include <net/netfilter/nf_nat_protocol.h>
46 #include <linux/netfilter/nfnetlink.h>
47 #include <linux/netfilter/nfnetlink_conntrack.h>
49 MODULE_LICENSE("GPL");
51 static char __initdata version[] = "0.93";
54 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
55 const struct nf_conntrack_tuple *tuple,
56 struct nf_conntrack_l4proto *l4proto)
59 struct nlattr *nest_parms;
61 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
64 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
66 if (likely(l4proto->tuple_to_nlattr))
67 ret = l4proto->tuple_to_nlattr(skb, tuple);
69 nla_nest_end(skb, nest_parms);
78 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
79 const struct nf_conntrack_tuple *tuple,
80 struct nf_conntrack_l3proto *l3proto)
83 struct nlattr *nest_parms;
85 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
89 if (likely(l3proto->tuple_to_nlattr))
90 ret = l3proto->tuple_to_nlattr(skb, tuple);
92 nla_nest_end(skb, nest_parms);
101 ctnetlink_dump_tuples(struct sk_buff *skb,
102 const struct nf_conntrack_tuple *tuple)
105 struct nf_conntrack_l3proto *l3proto;
106 struct nf_conntrack_l4proto *l4proto;
108 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
109 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
110 nf_ct_l3proto_put(l3proto);
112 if (unlikely(ret < 0))
115 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
116 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
117 nf_ct_l4proto_put(l4proto);
123 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
125 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
133 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
135 long timeout = (ct->timeout.expires - jiffies) / HZ;
140 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
148 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
150 struct nf_conntrack_l4proto *l4proto;
151 struct nlattr *nest_proto;
154 l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
155 if (!l4proto->to_nlattr) {
156 nf_ct_l4proto_put(l4proto);
160 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
162 goto nla_put_failure;
164 ret = l4proto->to_nlattr(skb, nest_proto, ct);
166 nf_ct_l4proto_put(l4proto);
168 nla_nest_end(skb, nest_proto);
173 nf_ct_l4proto_put(l4proto);
178 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
180 struct nlattr *nest_helper;
181 const struct nf_conn_help *help = nfct_help(ct);
182 struct nf_conntrack_helper *helper;
188 helper = rcu_dereference(help->helper);
192 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
194 goto nla_put_failure;
195 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
197 if (helper->to_nlattr)
198 helper->to_nlattr(skb, ct);
200 nla_nest_end(skb, nest_helper);
211 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
212 enum ip_conntrack_dir dir)
214 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
215 struct nlattr *nest_count;
216 const struct nf_conn_counter *acct;
218 acct = nf_conn_acct_find(ct);
222 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
224 goto nla_put_failure;
226 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
227 cpu_to_be64(acct[dir].packets));
228 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
229 cpu_to_be64(acct[dir].bytes));
231 nla_nest_end(skb, nest_count);
239 #ifdef CONFIG_NF_CONNTRACK_MARK
241 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
243 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
250 #define ctnetlink_dump_mark(a, b) (0)
253 #ifdef CONFIG_NF_CONNTRACK_SECMARK
255 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
257 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
264 #define ctnetlink_dump_secmark(a, b) (0)
267 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
270 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
272 struct nlattr *nest_parms;
274 if (!(ct->status & IPS_EXPECTED))
277 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
279 goto nla_put_failure;
280 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
281 goto nla_put_failure;
282 nla_nest_end(skb, nest_parms);
290 #ifdef CONFIG_NF_NAT_NEEDED
292 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
294 struct nlattr *nest_parms;
296 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
298 goto nla_put_failure;
300 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
301 htonl(natseq->correction_pos));
302 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
303 htonl(natseq->offset_before));
304 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
305 htonl(natseq->offset_after));
307 nla_nest_end(skb, nest_parms);
316 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
318 struct nf_nat_seq *natseq;
319 struct nf_conn_nat *nat = nfct_nat(ct);
321 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
324 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
325 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
328 natseq = &nat->seq[IP_CT_DIR_REPLY];
329 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
335 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
339 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
341 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
349 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
351 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
358 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
361 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
362 int event, int nowait,
363 const struct nf_conn *ct)
365 struct nlmsghdr *nlh;
366 struct nfgenmsg *nfmsg;
367 struct nlattr *nest_parms;
368 unsigned char *b = skb_tail_pointer(skb);
370 event |= NFNL_SUBSYS_CTNETLINK << 8;
371 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
372 nfmsg = NLMSG_DATA(nlh);
374 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
375 nfmsg->nfgen_family = nf_ct_l3num(ct);
376 nfmsg->version = NFNETLINK_V0;
379 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
381 goto nla_put_failure;
382 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
383 goto nla_put_failure;
384 nla_nest_end(skb, nest_parms);
386 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
388 goto nla_put_failure;
389 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
390 goto nla_put_failure;
391 nla_nest_end(skb, nest_parms);
393 if (ctnetlink_dump_status(skb, ct) < 0 ||
394 ctnetlink_dump_timeout(skb, ct) < 0 ||
395 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
396 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
397 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
398 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
399 ctnetlink_dump_mark(skb, ct) < 0 ||
400 ctnetlink_dump_secmark(skb, ct) < 0 ||
401 ctnetlink_dump_id(skb, ct) < 0 ||
402 ctnetlink_dump_use(skb, ct) < 0 ||
403 ctnetlink_dump_master(skb, ct) < 0 ||
404 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
405 goto nla_put_failure;
407 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
416 #ifdef CONFIG_NF_CONNTRACK_EVENTS
417 static int ctnetlink_conntrack_event(struct notifier_block *this,
418 unsigned long events, void *ptr)
420 struct nlmsghdr *nlh;
421 struct nfgenmsg *nfmsg;
422 struct nlattr *nest_parms;
423 struct nf_conn *ct = (struct nf_conn *)ptr;
427 unsigned int flags = 0, group;
429 /* ignore our fake conntrack entry */
430 if (ct == &nf_conntrack_untracked)
433 if (events & IPCT_DESTROY) {
434 type = IPCTNL_MSG_CT_DELETE;
435 group = NFNLGRP_CONNTRACK_DESTROY;
436 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
437 type = IPCTNL_MSG_CT_NEW;
438 flags = NLM_F_CREATE|NLM_F_EXCL;
439 group = NFNLGRP_CONNTRACK_NEW;
440 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
441 type = IPCTNL_MSG_CT_NEW;
442 group = NFNLGRP_CONNTRACK_UPDATE;
446 if (!nfnetlink_has_listeners(group))
449 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
455 type |= NFNL_SUBSYS_CTNETLINK << 8;
456 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
457 nfmsg = NLMSG_DATA(nlh);
459 nlh->nlmsg_flags = flags;
460 nfmsg->nfgen_family = nf_ct_l3num(ct);
461 nfmsg->version = NFNETLINK_V0;
464 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
466 goto nla_put_failure;
467 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
468 goto nla_put_failure;
469 nla_nest_end(skb, nest_parms);
471 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
473 goto nla_put_failure;
474 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
475 goto nla_put_failure;
476 nla_nest_end(skb, nest_parms);
478 if (ctnetlink_dump_id(skb, ct) < 0)
479 goto nla_put_failure;
481 if (ctnetlink_dump_status(skb, ct) < 0)
482 goto nla_put_failure;
484 if (events & IPCT_DESTROY) {
485 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
486 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
487 goto nla_put_failure;
489 if (ctnetlink_dump_timeout(skb, ct) < 0)
490 goto nla_put_failure;
492 if (events & IPCT_PROTOINFO
493 && ctnetlink_dump_protoinfo(skb, ct) < 0)
494 goto nla_put_failure;
496 if ((events & IPCT_HELPER || nfct_help(ct))
497 && ctnetlink_dump_helpinfo(skb, ct) < 0)
498 goto nla_put_failure;
500 #ifdef CONFIG_NF_CONNTRACK_SECMARK
501 if ((events & IPCT_SECMARK || ct->secmark)
502 && ctnetlink_dump_secmark(skb, ct) < 0)
503 goto nla_put_failure;
506 if (events & IPCT_RELATED &&
507 ctnetlink_dump_master(skb, ct) < 0)
508 goto nla_put_failure;
510 if (events & IPCT_NATSEQADJ &&
511 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
512 goto nla_put_failure;
515 #ifdef CONFIG_NF_CONNTRACK_MARK
516 if ((events & IPCT_MARK || ct->mark)
517 && ctnetlink_dump_mark(skb, ct) < 0)
518 goto nla_put_failure;
521 nlh->nlmsg_len = skb->tail - b;
522 nfnetlink_send(skb, 0, group, 0);
530 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
532 static int ctnetlink_done(struct netlink_callback *cb)
535 nf_ct_put((struct nf_conn *)cb->args[1]);
540 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
542 struct nf_conn *ct, *last;
543 struct nf_conntrack_tuple_hash *h;
544 struct hlist_node *n;
545 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
546 u_int8_t l3proto = nfmsg->nfgen_family;
549 last = (struct nf_conn *)cb->args[1];
550 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
552 hlist_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
554 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
556 ct = nf_ct_tuplehash_to_ctrack(h);
557 /* Dump entries of a given L3 protocol number.
558 * If it is not specified, ie. l3proto == 0,
559 * then dump everything. */
560 if (l3proto && nf_ct_l3num(ct) != l3proto)
567 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
571 if (!atomic_inc_not_zero(&ct->ct_general.use))
573 cb->args[1] = (unsigned long)ct;
577 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
578 IPCTNL_MSG_CT_GET_CTRZERO) {
579 struct nf_conn_counter *acct;
581 acct = nf_conn_acct_find(ct);
583 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
600 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
602 struct nlattr *tb[CTA_IP_MAX+1];
603 struct nf_conntrack_l3proto *l3proto;
606 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
608 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
610 if (likely(l3proto->nlattr_to_tuple)) {
611 ret = nla_validate_nested(attr, CTA_IP_MAX,
612 l3proto->nla_policy);
614 ret = l3proto->nlattr_to_tuple(tb, tuple);
617 nf_ct_l3proto_put(l3proto);
622 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
623 [CTA_PROTO_NUM] = { .type = NLA_U8 },
627 ctnetlink_parse_tuple_proto(struct nlattr *attr,
628 struct nf_conntrack_tuple *tuple)
630 struct nlattr *tb[CTA_PROTO_MAX+1];
631 struct nf_conntrack_l4proto *l4proto;
634 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
638 if (!tb[CTA_PROTO_NUM])
640 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
642 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
644 if (likely(l4proto->nlattr_to_tuple)) {
645 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
646 l4proto->nla_policy);
648 ret = l4proto->nlattr_to_tuple(tb, tuple);
651 nf_ct_l4proto_put(l4proto);
657 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
658 enum ctattr_tuple type, u_int8_t l3num)
660 struct nlattr *tb[CTA_TUPLE_MAX+1];
663 memset(tuple, 0, sizeof(*tuple));
665 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
667 if (!tb[CTA_TUPLE_IP])
670 tuple->src.l3num = l3num;
672 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
676 if (!tb[CTA_TUPLE_PROTO])
679 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
683 /* orig and expect tuples get DIR_ORIGINAL */
684 if (type == CTA_TUPLE_REPLY)
685 tuple->dst.dir = IP_CT_DIR_REPLY;
687 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
693 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
695 struct nlattr *tb[CTA_HELP_MAX+1];
697 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
699 if (!tb[CTA_HELP_NAME])
702 *helper_name = nla_data(tb[CTA_HELP_NAME]);
707 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
708 [CTA_STATUS] = { .type = NLA_U32 },
709 [CTA_TIMEOUT] = { .type = NLA_U32 },
710 [CTA_MARK] = { .type = NLA_U32 },
711 [CTA_USE] = { .type = NLA_U32 },
712 [CTA_ID] = { .type = NLA_U32 },
716 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
717 struct nlmsghdr *nlh, struct nlattr *cda[])
719 struct nf_conntrack_tuple_hash *h;
720 struct nf_conntrack_tuple tuple;
722 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
723 u_int8_t u3 = nfmsg->nfgen_family;
726 if (cda[CTA_TUPLE_ORIG])
727 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
728 else if (cda[CTA_TUPLE_REPLY])
729 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
731 /* Flush the whole table */
732 nf_conntrack_flush(&init_net);
739 h = nf_conntrack_find_get(&init_net, &tuple);
743 ct = nf_ct_tuplehash_to_ctrack(h);
746 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
747 if (id != (u32)(unsigned long)ct) {
760 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
761 struct nlmsghdr *nlh, struct nlattr *cda[])
763 struct nf_conntrack_tuple_hash *h;
764 struct nf_conntrack_tuple tuple;
766 struct sk_buff *skb2 = NULL;
767 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
768 u_int8_t u3 = nfmsg->nfgen_family;
771 if (nlh->nlmsg_flags & NLM_F_DUMP)
772 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
775 if (cda[CTA_TUPLE_ORIG])
776 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
777 else if (cda[CTA_TUPLE_REPLY])
778 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
785 h = nf_conntrack_find_get(&init_net, &tuple);
789 ct = nf_ct_tuplehash_to_ctrack(h);
792 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
798 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
799 IPCTNL_MSG_CT_NEW, 1, ct);
804 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
817 ctnetlink_parse_nat_setup(struct nf_conn *ct,
818 enum nf_nat_manip_type manip,
821 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
823 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
824 if (!parse_nat_setup) {
828 if (request_module("nf-nat-ipv4") < 0) {
835 if (nfnetlink_parse_nat_setup_hook)
841 return parse_nat_setup(ct, manip, attr);
845 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
848 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
849 d = ct->status ^ status;
851 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
855 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
856 /* SEEN_REPLY bit can only be set */
859 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
860 /* ASSURED bit can only be set */
863 /* Be careful here, modifying NAT bits can screw up things,
864 * so don't let users modify them directly if they don't pass
866 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
871 ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[])
873 #ifdef CONFIG_NF_NAT_NEEDED
876 if (cda[CTA_NAT_DST]) {
877 ret = ctnetlink_parse_nat_setup(ct,
883 if (cda[CTA_NAT_SRC]) {
884 ret = ctnetlink_parse_nat_setup(ct,
897 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
899 struct nf_conntrack_helper *helper;
900 struct nf_conn_help *help = nfct_help(ct);
904 /* don't change helper of sibling connections */
908 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
912 if (!strcmp(helpname, "")) {
913 if (help && help->helper) {
914 /* we had a helper before ... */
915 nf_ct_remove_expectations(ct);
916 rcu_assign_pointer(help->helper, NULL);
922 helper = __nf_conntrack_helper_find_byname(helpname);
927 if (help->helper == helper)
931 /* need to zero data of old helper */
932 memset(&help->help, 0, sizeof(help->help));
934 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
939 rcu_assign_pointer(help->helper, helper);
945 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
947 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
949 if (!del_timer(&ct->timeout))
952 ct->timeout.expires = jiffies + timeout * HZ;
953 add_timer(&ct->timeout);
959 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
961 struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
962 struct nf_conntrack_l4proto *l4proto;
965 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
967 l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
968 if (l4proto->from_nlattr)
969 err = l4proto->from_nlattr(tb, ct);
970 nf_ct_l4proto_put(l4proto);
975 #ifdef CONFIG_NF_NAT_NEEDED
977 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
979 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
981 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
983 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
986 natseq->correction_pos =
987 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
989 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
992 natseq->offset_before =
993 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
995 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
998 natseq->offset_after =
999 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1005 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1008 struct nf_conn_nat *nat = nfct_nat(ct);
1013 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1014 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1015 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1019 ct->status |= IPS_SEQ_ADJUST;
1022 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1023 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1024 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1028 ct->status |= IPS_SEQ_ADJUST;
1036 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1040 if (cda[CTA_HELP]) {
1041 err = ctnetlink_change_helper(ct, cda);
1046 if (cda[CTA_TIMEOUT]) {
1047 err = ctnetlink_change_timeout(ct, cda);
1052 if (cda[CTA_STATUS]) {
1053 err = ctnetlink_change_status(ct, cda);
1058 if (cda[CTA_PROTOINFO]) {
1059 err = ctnetlink_change_protoinfo(ct, cda);
1064 #if defined(CONFIG_NF_CONNTRACK_MARK)
1066 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1069 #ifdef CONFIG_NF_NAT_NEEDED
1070 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1071 err = ctnetlink_change_nat_seq_adj(ct, cda);
1081 ctnetlink_create_conntrack(struct nlattr *cda[],
1082 struct nf_conntrack_tuple *otuple,
1083 struct nf_conntrack_tuple *rtuple,
1084 struct nf_conn *master_ct)
1088 struct nf_conn_help *help;
1089 struct nf_conntrack_helper *helper;
1091 ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_KERNEL);
1092 if (ct == NULL || IS_ERR(ct))
1095 if (!cda[CTA_TIMEOUT])
1097 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1099 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1100 ct->status |= IPS_CONFIRMED;
1103 helper = __nf_ct_helper_find(rtuple);
1105 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1111 /* not in hash table yet so not strictly necessary */
1112 rcu_assign_pointer(help->helper, helper);
1115 if (cda[CTA_STATUS]) {
1116 err = ctnetlink_change_status(ct, cda);
1123 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1124 err = ctnetlink_change_nat(ct, cda);
1131 if (cda[CTA_PROTOINFO]) {
1132 err = ctnetlink_change_protoinfo(ct, cda);
1139 nf_ct_acct_ext_add(ct, GFP_KERNEL);
1141 #if defined(CONFIG_NF_CONNTRACK_MARK)
1143 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1146 /* setup master conntrack: this is a confirmed expectation */
1148 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1149 ct->master = master_ct;
1152 add_timer(&ct->timeout);
1153 nf_conntrack_hash_insert(ct);
1159 nf_conntrack_free(ct);
1164 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1165 struct nlmsghdr *nlh, struct nlattr *cda[])
1167 struct nf_conntrack_tuple otuple, rtuple;
1168 struct nf_conntrack_tuple_hash *h = NULL;
1169 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1170 u_int8_t u3 = nfmsg->nfgen_family;
1173 if (cda[CTA_TUPLE_ORIG]) {
1174 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1179 if (cda[CTA_TUPLE_REPLY]) {
1180 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1185 spin_lock_bh(&nf_conntrack_lock);
1186 if (cda[CTA_TUPLE_ORIG])
1187 h = __nf_conntrack_find(&init_net, &otuple);
1188 else if (cda[CTA_TUPLE_REPLY])
1189 h = __nf_conntrack_find(&init_net, &rtuple);
1192 struct nf_conntrack_tuple master;
1193 struct nf_conntrack_tuple_hash *master_h = NULL;
1194 struct nf_conn *master_ct = NULL;
1196 if (cda[CTA_TUPLE_MASTER]) {
1197 err = ctnetlink_parse_tuple(cda,
1204 master_h = __nf_conntrack_find(&init_net, &master);
1205 if (master_h == NULL) {
1209 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1210 atomic_inc(&master_ct->ct_general.use);
1213 spin_unlock_bh(&nf_conntrack_lock);
1215 if (nlh->nlmsg_flags & NLM_F_CREATE)
1216 err = ctnetlink_create_conntrack(cda,
1220 if (err < 0 && master_ct)
1221 nf_ct_put(master_ct);
1225 /* implicit 'else' */
1227 /* We manipulate the conntrack inside the global conntrack table lock,
1228 * so there's no need to increase the refcount */
1230 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1231 /* we only allow nat config for new conntracks */
1232 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1236 /* can't link an existing conntrack to a master */
1237 if (cda[CTA_TUPLE_MASTER]) {
1241 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1246 spin_unlock_bh(&nf_conntrack_lock);
1250 /***********************************************************************
1252 ***********************************************************************/
1255 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1256 const struct nf_conntrack_tuple *tuple,
1257 enum ctattr_expect type)
1259 struct nlattr *nest_parms;
1261 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1263 goto nla_put_failure;
1264 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1265 goto nla_put_failure;
1266 nla_nest_end(skb, nest_parms);
1275 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1276 const struct nf_conntrack_tuple *tuple,
1277 const struct nf_conntrack_tuple_mask *mask)
1280 struct nf_conntrack_l3proto *l3proto;
1281 struct nf_conntrack_l4proto *l4proto;
1282 struct nf_conntrack_tuple m;
1283 struct nlattr *nest_parms;
1285 memset(&m, 0xFF, sizeof(m));
1286 m.src.u.all = mask->src.u.all;
1287 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1289 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1291 goto nla_put_failure;
1293 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1294 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1295 nf_ct_l3proto_put(l3proto);
1297 if (unlikely(ret < 0))
1298 goto nla_put_failure;
1300 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1301 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1302 nf_ct_l4proto_put(l4proto);
1303 if (unlikely(ret < 0))
1304 goto nla_put_failure;
1306 nla_nest_end(skb, nest_parms);
1315 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1316 const struct nf_conntrack_expect *exp)
1318 struct nf_conn *master = exp->master;
1319 long timeout = (exp->timeout.expires - jiffies) / HZ;
1324 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1325 goto nla_put_failure;
1326 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1327 goto nla_put_failure;
1328 if (ctnetlink_exp_dump_tuple(skb,
1329 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1330 CTA_EXPECT_MASTER) < 0)
1331 goto nla_put_failure;
1333 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1334 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1343 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1346 const struct nf_conntrack_expect *exp)
1348 struct nlmsghdr *nlh;
1349 struct nfgenmsg *nfmsg;
1350 unsigned char *b = skb_tail_pointer(skb);
1352 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1353 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1354 nfmsg = NLMSG_DATA(nlh);
1356 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1357 nfmsg->nfgen_family = exp->tuple.src.l3num;
1358 nfmsg->version = NFNETLINK_V0;
1361 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1362 goto nla_put_failure;
1364 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1373 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1374 static int ctnetlink_expect_event(struct notifier_block *this,
1375 unsigned long events, void *ptr)
1377 struct nlmsghdr *nlh;
1378 struct nfgenmsg *nfmsg;
1379 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1380 struct sk_buff *skb;
1385 if (events & IPEXP_NEW) {
1386 type = IPCTNL_MSG_EXP_NEW;
1387 flags = NLM_F_CREATE|NLM_F_EXCL;
1391 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1394 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1400 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1401 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1402 nfmsg = NLMSG_DATA(nlh);
1404 nlh->nlmsg_flags = flags;
1405 nfmsg->nfgen_family = exp->tuple.src.l3num;
1406 nfmsg->version = NFNETLINK_V0;
1409 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1410 goto nla_put_failure;
1412 nlh->nlmsg_len = skb->tail - b;
1413 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1422 static int ctnetlink_exp_done(struct netlink_callback *cb)
1425 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1430 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1432 struct net *net = &init_net;
1433 struct nf_conntrack_expect *exp, *last;
1434 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1435 struct hlist_node *n;
1436 u_int8_t l3proto = nfmsg->nfgen_family;
1439 last = (struct nf_conntrack_expect *)cb->args[1];
1440 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1442 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1444 if (l3proto && exp->tuple.src.l3num != l3proto)
1451 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1455 if (!atomic_inc_not_zero(&exp->use))
1457 cb->args[1] = (unsigned long)exp;
1469 nf_ct_expect_put(last);
1474 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1475 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1476 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1480 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1481 struct nlmsghdr *nlh, struct nlattr *cda[])
1483 struct nf_conntrack_tuple tuple;
1484 struct nf_conntrack_expect *exp;
1485 struct sk_buff *skb2;
1486 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1487 u_int8_t u3 = nfmsg->nfgen_family;
1490 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1491 return netlink_dump_start(ctnl, skb, nlh,
1492 ctnetlink_exp_dump_table,
1493 ctnetlink_exp_done);
1496 if (cda[CTA_EXPECT_MASTER])
1497 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1504 exp = nf_ct_expect_find_get(&init_net, &tuple);
1508 if (cda[CTA_EXPECT_ID]) {
1509 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1510 if (ntohl(id) != (u32)(unsigned long)exp) {
1511 nf_ct_expect_put(exp);
1517 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1521 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1522 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1527 nf_ct_expect_put(exp);
1529 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1534 nf_ct_expect_put(exp);
1539 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1540 struct nlmsghdr *nlh, struct nlattr *cda[])
1542 struct nf_conntrack_expect *exp;
1543 struct nf_conntrack_tuple tuple;
1544 struct nf_conntrack_helper *h;
1545 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1546 struct hlist_node *n, *next;
1547 u_int8_t u3 = nfmsg->nfgen_family;
1551 if (cda[CTA_EXPECT_TUPLE]) {
1552 /* delete a single expect by tuple */
1553 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1557 /* bump usage count to 2 */
1558 exp = nf_ct_expect_find_get(&init_net, &tuple);
1562 if (cda[CTA_EXPECT_ID]) {
1563 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1564 if (ntohl(id) != (u32)(unsigned long)exp) {
1565 nf_ct_expect_put(exp);
1570 /* after list removal, usage count == 1 */
1571 nf_ct_unexpect_related(exp);
1572 /* have to put what we 'get' above.
1573 * after this line usage count == 0 */
1574 nf_ct_expect_put(exp);
1575 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1576 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1577 struct nf_conn_help *m_help;
1579 /* delete all expectations for this helper */
1580 spin_lock_bh(&nf_conntrack_lock);
1581 h = __nf_conntrack_helper_find_byname(name);
1583 spin_unlock_bh(&nf_conntrack_lock);
1586 for (i = 0; i < nf_ct_expect_hsize; i++) {
1587 hlist_for_each_entry_safe(exp, n, next,
1588 &init_net.ct.expect_hash[i],
1590 m_help = nfct_help(exp->master);
1591 if (m_help->helper == h
1592 && del_timer(&exp->timeout)) {
1593 nf_ct_unlink_expect(exp);
1594 nf_ct_expect_put(exp);
1598 spin_unlock_bh(&nf_conntrack_lock);
1600 /* This basically means we have to flush everything*/
1601 spin_lock_bh(&nf_conntrack_lock);
1602 for (i = 0; i < nf_ct_expect_hsize; i++) {
1603 hlist_for_each_entry_safe(exp, n, next,
1604 &init_net.ct.expect_hash[i],
1606 if (del_timer(&exp->timeout)) {
1607 nf_ct_unlink_expect(exp);
1608 nf_ct_expect_put(exp);
1612 spin_unlock_bh(&nf_conntrack_lock);
1618 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1624 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1626 struct nf_conntrack_tuple tuple, mask, master_tuple;
1627 struct nf_conntrack_tuple_hash *h = NULL;
1628 struct nf_conntrack_expect *exp;
1630 struct nf_conn_help *help;
1633 /* caller guarantees that those three CTA_EXPECT_* exist */
1634 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1637 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1640 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1644 /* Look for master conntrack of this expectation */
1645 h = nf_conntrack_find_get(&init_net, &master_tuple);
1648 ct = nf_ct_tuplehash_to_ctrack(h);
1649 help = nfct_help(ct);
1651 if (!help || !help->helper) {
1652 /* such conntrack hasn't got any helper, abort */
1657 exp = nf_ct_expect_alloc(ct);
1663 exp->expectfn = NULL;
1667 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1668 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1669 exp->mask.src.u.all = mask.src.u.all;
1671 err = nf_ct_expect_related(exp);
1672 nf_ct_expect_put(exp);
1675 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1680 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1681 struct nlmsghdr *nlh, struct nlattr *cda[])
1683 struct nf_conntrack_tuple tuple;
1684 struct nf_conntrack_expect *exp;
1685 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1686 u_int8_t u3 = nfmsg->nfgen_family;
1689 if (!cda[CTA_EXPECT_TUPLE]
1690 || !cda[CTA_EXPECT_MASK]
1691 || !cda[CTA_EXPECT_MASTER])
1694 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1698 spin_lock_bh(&nf_conntrack_lock);
1699 exp = __nf_ct_expect_find(&init_net, &tuple);
1702 spin_unlock_bh(&nf_conntrack_lock);
1704 if (nlh->nlmsg_flags & NLM_F_CREATE)
1705 err = ctnetlink_create_expect(cda, u3);
1710 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1711 err = ctnetlink_change_expect(exp, cda);
1712 spin_unlock_bh(&nf_conntrack_lock);
1717 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1718 static struct notifier_block ctnl_notifier = {
1719 .notifier_call = ctnetlink_conntrack_event,
1722 static struct notifier_block ctnl_notifier_exp = {
1723 .notifier_call = ctnetlink_expect_event,
1727 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1728 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1729 .attr_count = CTA_MAX,
1730 .policy = ct_nla_policy },
1731 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1732 .attr_count = CTA_MAX,
1733 .policy = ct_nla_policy },
1734 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1735 .attr_count = CTA_MAX,
1736 .policy = ct_nla_policy },
1737 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1738 .attr_count = CTA_MAX,
1739 .policy = ct_nla_policy },
1742 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1743 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1744 .attr_count = CTA_EXPECT_MAX,
1745 .policy = exp_nla_policy },
1746 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1747 .attr_count = CTA_EXPECT_MAX,
1748 .policy = exp_nla_policy },
1749 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1750 .attr_count = CTA_EXPECT_MAX,
1751 .policy = exp_nla_policy },
1754 static const struct nfnetlink_subsystem ctnl_subsys = {
1755 .name = "conntrack",
1756 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1757 .cb_count = IPCTNL_MSG_MAX,
1761 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1762 .name = "conntrack_expect",
1763 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1764 .cb_count = IPCTNL_MSG_EXP_MAX,
1768 MODULE_ALIAS("ip_conntrack_netlink");
1769 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1770 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1772 static int __init ctnetlink_init(void)
1776 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1777 ret = nfnetlink_subsys_register(&ctnl_subsys);
1779 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1783 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1785 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1786 goto err_unreg_subsys;
1789 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1790 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1792 printk("ctnetlink_init: cannot register notifier.\n");
1793 goto err_unreg_exp_subsys;
1796 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1798 printk("ctnetlink_init: cannot expect register notifier.\n");
1799 goto err_unreg_notifier;
1805 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1807 nf_conntrack_unregister_notifier(&ctnl_notifier);
1808 err_unreg_exp_subsys:
1809 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1812 nfnetlink_subsys_unregister(&ctnl_subsys);
1817 static void __exit ctnetlink_exit(void)
1819 printk("ctnetlink: unregistering from nfnetlink.\n");
1821 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1822 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1823 nf_conntrack_unregister_notifier(&ctnl_notifier);
1826 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1827 nfnetlink_subsys_unregister(&ctnl_subsys);
1831 module_init(ctnetlink_init);
1832 module_exit(ctnetlink_exit);