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";
48 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
49 const struct ip_conntrack_tuple *tuple,
50 struct ip_conntrack_protocol *proto)
53 struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
55 NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
57 if (likely(proto->tuple_to_nfattr))
58 ret = proto->tuple_to_nfattr(skb, tuple);
60 NFA_NEST_END(skb, nest_parms);
69 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
70 const struct ip_conntrack_tuple *tuple)
72 struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
74 NFA_PUT(skb, CTA_IP_V4_SRC, sizeof(__be32), &tuple->src.ip);
75 NFA_PUT(skb, CTA_IP_V4_DST, sizeof(__be32), &tuple->dst.ip);
77 NFA_NEST_END(skb, nest_parms);
86 ctnetlink_dump_tuples(struct sk_buff *skb,
87 const struct ip_conntrack_tuple *tuple)
90 struct ip_conntrack_protocol *proto;
92 ret = ctnetlink_dump_tuples_ip(skb, tuple);
93 if (unlikely(ret < 0))
96 proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
97 ret = ctnetlink_dump_tuples_proto(skb, tuple, proto);
98 ip_conntrack_proto_put(proto);
104 ctnetlink_dump_status(struct sk_buff *skb, const struct ip_conntrack *ct)
106 __be32 status = htonl((u_int32_t) ct->status);
107 NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
115 ctnetlink_dump_timeout(struct sk_buff *skb, const struct ip_conntrack *ct)
117 long timeout_l = ct->timeout.expires - jiffies;
123 timeout = htonl(timeout_l / HZ);
125 NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
133 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
135 struct ip_conntrack_protocol *proto = ip_conntrack_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
137 struct nfattr *nest_proto;
140 if (!proto->to_nfattr) {
141 ip_conntrack_proto_put(proto);
145 nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
147 ret = proto->to_nfattr(skb, nest_proto, ct);
149 ip_conntrack_proto_put(proto);
151 NFA_NEST_END(skb, nest_proto);
160 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
162 struct nfattr *nest_helper;
167 nest_helper = NFA_NEST(skb, CTA_HELP);
168 NFA_PUT(skb, CTA_HELP_NAME, strlen(ct->helper->name), ct->helper->name);
170 if (ct->helper->to_nfattr)
171 ct->helper->to_nfattr(skb, ct);
173 NFA_NEST_END(skb, nest_helper);
181 #ifdef CONFIG_IP_NF_CT_ACCT
183 ctnetlink_dump_counters(struct sk_buff *skb, const struct ip_conntrack *ct,
184 enum ip_conntrack_dir dir)
186 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
187 struct nfattr *nest_count = NFA_NEST(skb, type);
190 tmp = htonl(ct->counters[dir].packets);
191 NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(__be32), &tmp);
193 tmp = htonl(ct->counters[dir].bytes);
194 NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(__be32), &tmp);
196 NFA_NEST_END(skb, nest_count);
204 #define ctnetlink_dump_counters(a, b, c) (0)
207 #ifdef CONFIG_IP_NF_CONNTRACK_MARK
209 ctnetlink_dump_mark(struct sk_buff *skb, const struct ip_conntrack *ct)
211 __be32 mark = htonl(ct->mark);
213 NFA_PUT(skb, CTA_MARK, sizeof(__be32), &mark);
220 #define ctnetlink_dump_mark(a, b) (0)
224 ctnetlink_dump_id(struct sk_buff *skb, const struct ip_conntrack *ct)
226 __be32 id = htonl(ct->id);
227 NFA_PUT(skb, CTA_ID, sizeof(__be32), &id);
235 ctnetlink_dump_use(struct sk_buff *skb, const struct ip_conntrack *ct)
237 __be32 use = htonl(atomic_read(&ct->ct_general.use));
239 NFA_PUT(skb, CTA_USE, sizeof(__be32), &use);
246 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
249 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
250 int event, int nowait,
251 const struct ip_conntrack *ct)
253 struct nlmsghdr *nlh;
254 struct nfgenmsg *nfmsg;
255 struct nfattr *nest_parms;
260 event |= NFNL_SUBSYS_CTNETLINK << 8;
261 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
262 nfmsg = NLMSG_DATA(nlh);
264 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
265 nfmsg->nfgen_family = AF_INET;
266 nfmsg->version = NFNETLINK_V0;
269 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
270 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
272 NFA_NEST_END(skb, nest_parms);
274 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
275 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
277 NFA_NEST_END(skb, nest_parms);
279 if (ctnetlink_dump_status(skb, ct) < 0 ||
280 ctnetlink_dump_timeout(skb, ct) < 0 ||
281 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
282 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
283 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
284 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
285 ctnetlink_dump_mark(skb, ct) < 0 ||
286 ctnetlink_dump_id(skb, ct) < 0 ||
287 ctnetlink_dump_use(skb, ct) < 0)
290 nlh->nlmsg_len = skb->tail - b;
295 skb_trim(skb, b - skb->data);
299 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
300 static int ctnetlink_conntrack_event(struct notifier_block *this,
301 unsigned long events, void *ptr)
303 struct nlmsghdr *nlh;
304 struct nfgenmsg *nfmsg;
305 struct nfattr *nest_parms;
306 struct ip_conntrack *ct = (struct ip_conntrack *)ptr;
310 unsigned int flags = 0, group;
312 /* ignore our fake conntrack entry */
313 if (ct == &ip_conntrack_untracked)
316 if (events & IPCT_DESTROY) {
317 type = IPCTNL_MSG_CT_DELETE;
318 group = NFNLGRP_CONNTRACK_DESTROY;
319 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
320 type = IPCTNL_MSG_CT_NEW;
321 flags = NLM_F_CREATE|NLM_F_EXCL;
322 /* dump everything */
324 group = NFNLGRP_CONNTRACK_NEW;
325 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
326 type = IPCTNL_MSG_CT_NEW;
327 group = NFNLGRP_CONNTRACK_UPDATE;
331 if (!nfnetlink_has_listeners(group))
334 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
340 type |= NFNL_SUBSYS_CTNETLINK << 8;
341 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
342 nfmsg = NLMSG_DATA(nlh);
344 nlh->nlmsg_flags = flags;
345 nfmsg->nfgen_family = AF_INET;
346 nfmsg->version = NFNETLINK_V0;
349 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
350 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
352 NFA_NEST_END(skb, nest_parms);
354 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
355 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
357 NFA_NEST_END(skb, nest_parms);
359 /* NAT stuff is now a status flag */
360 if ((events & IPCT_STATUS || events & IPCT_NATINFO)
361 && ctnetlink_dump_status(skb, ct) < 0)
363 if (events & IPCT_REFRESH
364 && ctnetlink_dump_timeout(skb, ct) < 0)
366 if (events & IPCT_PROTOINFO
367 && ctnetlink_dump_protoinfo(skb, ct) < 0)
369 if (events & IPCT_HELPINFO
370 && ctnetlink_dump_helpinfo(skb, ct) < 0)
373 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
374 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
377 if (events & IPCT_MARK
378 && ctnetlink_dump_mark(skb, ct) < 0)
381 nlh->nlmsg_len = skb->tail - b;
382 nfnetlink_send(skb, 0, group, 0);
390 #endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
392 static int ctnetlink_done(struct netlink_callback *cb)
395 ip_conntrack_put((struct ip_conntrack *)cb->args[1]);
400 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
402 struct ip_conntrack *ct, *last;
403 struct ip_conntrack_tuple_hash *h;
406 read_lock_bh(&ip_conntrack_lock);
407 last = (struct ip_conntrack *)cb->args[1];
408 for (; cb->args[0] < ip_conntrack_htable_size; cb->args[0]++) {
410 list_for_each_prev(i, &ip_conntrack_hash[cb->args[0]]) {
411 h = (struct ip_conntrack_tuple_hash *) i;
412 if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
414 ct = tuplehash_to_ctrack(h);
420 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
424 nf_conntrack_get(&ct->ct_general);
425 cb->args[1] = (unsigned long)ct;
428 #ifdef CONFIG_NF_CT_ACCT
429 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
430 IPCTNL_MSG_CT_GET_CTRZERO)
431 memset(&ct->counters, 0, sizeof(ct->counters));
440 read_unlock_bh(&ip_conntrack_lock);
442 ip_conntrack_put(last);
447 static const size_t cta_min_ip[CTA_IP_MAX] = {
448 [CTA_IP_V4_SRC-1] = sizeof(__be32),
449 [CTA_IP_V4_DST-1] = sizeof(__be32),
453 ctnetlink_parse_tuple_ip(struct nfattr *attr, struct ip_conntrack_tuple *tuple)
455 struct nfattr *tb[CTA_IP_MAX];
457 nfattr_parse_nested(tb, CTA_IP_MAX, attr);
459 if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip))
462 if (!tb[CTA_IP_V4_SRC-1])
464 tuple->src.ip = *(__be32 *)NFA_DATA(tb[CTA_IP_V4_SRC-1]);
466 if (!tb[CTA_IP_V4_DST-1])
468 tuple->dst.ip = *(__be32 *)NFA_DATA(tb[CTA_IP_V4_DST-1]);
473 static const size_t cta_min_proto[CTA_PROTO_MAX] = {
474 [CTA_PROTO_NUM-1] = sizeof(u_int8_t),
475 [CTA_PROTO_SRC_PORT-1] = sizeof(u_int16_t),
476 [CTA_PROTO_DST_PORT-1] = sizeof(u_int16_t),
477 [CTA_PROTO_ICMP_TYPE-1] = sizeof(u_int8_t),
478 [CTA_PROTO_ICMP_CODE-1] = sizeof(u_int8_t),
479 [CTA_PROTO_ICMP_ID-1] = sizeof(u_int16_t),
483 ctnetlink_parse_tuple_proto(struct nfattr *attr,
484 struct ip_conntrack_tuple *tuple)
486 struct nfattr *tb[CTA_PROTO_MAX];
487 struct ip_conntrack_protocol *proto;
490 nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
492 if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
495 if (!tb[CTA_PROTO_NUM-1])
497 tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
499 proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
501 if (likely(proto->nfattr_to_tuple))
502 ret = proto->nfattr_to_tuple(tb, tuple);
504 ip_conntrack_proto_put(proto);
510 ctnetlink_parse_tuple(struct nfattr *cda[], struct ip_conntrack_tuple *tuple,
511 enum ctattr_tuple type)
513 struct nfattr *tb[CTA_TUPLE_MAX];
516 memset(tuple, 0, sizeof(*tuple));
518 nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
520 if (!tb[CTA_TUPLE_IP-1])
523 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
527 if (!tb[CTA_TUPLE_PROTO-1])
530 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
534 /* orig and expect tuples get DIR_ORIGINAL */
535 if (type == CTA_TUPLE_REPLY)
536 tuple->dst.dir = IP_CT_DIR_REPLY;
538 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
543 #ifdef CONFIG_IP_NF_NAT_NEEDED
544 static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
545 [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t),
546 [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t),
549 static int ctnetlink_parse_nat_proto(struct nfattr *attr,
550 const struct ip_conntrack *ct,
551 struct ip_nat_range *range)
553 struct nfattr *tb[CTA_PROTONAT_MAX];
554 struct ip_nat_protocol *npt;
556 nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
558 if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
561 npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
563 if (!npt->nfattr_to_range) {
564 ip_nat_proto_put(npt);
568 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
569 if (npt->nfattr_to_range(tb, range) > 0)
570 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
572 ip_nat_proto_put(npt);
577 static const size_t cta_min_nat[CTA_NAT_MAX] = {
578 [CTA_NAT_MINIP-1] = sizeof(__be32),
579 [CTA_NAT_MAXIP-1] = sizeof(__be32),
583 ctnetlink_parse_nat(struct nfattr *nat,
584 const struct ip_conntrack *ct, struct ip_nat_range *range)
586 struct nfattr *tb[CTA_NAT_MAX];
589 memset(range, 0, sizeof(*range));
591 nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
593 if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
596 if (tb[CTA_NAT_MINIP-1])
597 range->min_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
599 if (!tb[CTA_NAT_MAXIP-1])
600 range->max_ip = range->min_ip;
602 range->max_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
605 range->flags |= IP_NAT_RANGE_MAP_IPS;
607 if (!tb[CTA_NAT_PROTO-1])
610 err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
619 ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
621 struct nfattr *tb[CTA_HELP_MAX];
623 nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
625 if (!tb[CTA_HELP_NAME-1])
628 *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
633 static const size_t cta_min[CTA_MAX] = {
634 [CTA_STATUS-1] = sizeof(__be32),
635 [CTA_TIMEOUT-1] = sizeof(__be32),
636 [CTA_MARK-1] = sizeof(__be32),
637 [CTA_USE-1] = sizeof(__be32),
638 [CTA_ID-1] = sizeof(__be32)
642 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
643 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
645 struct ip_conntrack_tuple_hash *h;
646 struct ip_conntrack_tuple tuple;
647 struct ip_conntrack *ct;
650 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
653 if (cda[CTA_TUPLE_ORIG-1])
654 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
655 else if (cda[CTA_TUPLE_REPLY-1])
656 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
658 /* Flush the whole table */
659 ip_conntrack_flush();
666 h = ip_conntrack_find_get(&tuple, NULL);
670 ct = tuplehash_to_ctrack(h);
673 u_int32_t id = ntohl(*(__be32 *)NFA_DATA(cda[CTA_ID-1]));
675 ip_conntrack_put(ct);
679 if (del_timer(&ct->timeout))
680 ct->timeout.function((unsigned long)ct);
682 ip_conntrack_put(ct);
688 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
689 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
691 struct ip_conntrack_tuple_hash *h;
692 struct ip_conntrack_tuple tuple;
693 struct ip_conntrack *ct;
694 struct sk_buff *skb2 = NULL;
697 if (nlh->nlmsg_flags & NLM_F_DUMP) {
698 struct nfgenmsg *msg = NLMSG_DATA(nlh);
701 if (msg->nfgen_family != AF_INET)
702 return -EAFNOSUPPORT;
704 #ifndef CONFIG_IP_NF_CT_ACCT
705 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
708 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
709 ctnetlink_dump_table,
710 ctnetlink_done)) != 0)
713 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
720 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
723 if (cda[CTA_TUPLE_ORIG-1])
724 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
725 else if (cda[CTA_TUPLE_REPLY-1])
726 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
733 h = ip_conntrack_find_get(&tuple, NULL);
737 ct = tuplehash_to_ctrack(h);
740 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
742 ip_conntrack_put(ct);
745 NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
747 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
748 IPCTNL_MSG_CT_NEW, 1, ct);
749 ip_conntrack_put(ct);
753 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
766 ctnetlink_change_status(struct ip_conntrack *ct, struct nfattr *cda[])
769 unsigned status = ntohl(*(__be32 *)NFA_DATA(cda[CTA_STATUS-1]));
770 d = ct->status ^ status;
772 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
776 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
777 /* SEEN_REPLY bit can only be set */
781 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
782 /* ASSURED bit can only be set */
785 if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
786 #ifndef CONFIG_IP_NF_NAT_NEEDED
789 struct ip_nat_range range;
791 if (cda[CTA_NAT_DST-1]) {
792 if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
795 if (ip_nat_initialized(ct,
796 HOOK2MANIP(NF_IP_PRE_ROUTING)))
798 ip_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
800 if (cda[CTA_NAT_SRC-1]) {
801 if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
804 if (ip_nat_initialized(ct,
805 HOOK2MANIP(NF_IP_POST_ROUTING)))
807 ip_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
812 /* Be careful here, modifying NAT bits can screw up things,
813 * so don't let users modify them directly if they don't pass
815 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
821 ctnetlink_change_helper(struct ip_conntrack *ct, struct nfattr *cda[])
823 struct ip_conntrack_helper *helper;
827 /* don't change helper of sibling connections */
831 err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
835 helper = __ip_conntrack_helper_find_byname(helpname);
837 if (!strcmp(helpname, ""))
845 /* we had a helper before ... */
846 ip_ct_remove_expectations(ct);
849 /* need to zero data of old helper */
850 memset(&ct->help, 0, sizeof(ct->help));
860 ctnetlink_change_timeout(struct ip_conntrack *ct, struct nfattr *cda[])
862 u_int32_t timeout = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
864 if (!del_timer(&ct->timeout))
867 ct->timeout.expires = jiffies + timeout * HZ;
868 add_timer(&ct->timeout);
874 ctnetlink_change_protoinfo(struct ip_conntrack *ct, struct nfattr *cda[])
876 struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
877 struct ip_conntrack_protocol *proto;
878 u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
881 nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
883 proto = ip_conntrack_proto_find_get(npt);
885 if (proto->from_nfattr)
886 err = proto->from_nfattr(tb, ct);
887 ip_conntrack_proto_put(proto);
893 ctnetlink_change_conntrack(struct ip_conntrack *ct, struct nfattr *cda[])
897 if (cda[CTA_HELP-1]) {
898 err = ctnetlink_change_helper(ct, cda);
903 if (cda[CTA_TIMEOUT-1]) {
904 err = ctnetlink_change_timeout(ct, cda);
909 if (cda[CTA_STATUS-1]) {
910 err = ctnetlink_change_status(ct, cda);
915 if (cda[CTA_PROTOINFO-1]) {
916 err = ctnetlink_change_protoinfo(ct, cda);
921 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
923 ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
930 ctnetlink_create_conntrack(struct nfattr *cda[],
931 struct ip_conntrack_tuple *otuple,
932 struct ip_conntrack_tuple *rtuple)
934 struct ip_conntrack *ct;
937 ct = ip_conntrack_alloc(otuple, rtuple);
938 if (ct == NULL || IS_ERR(ct))
941 if (!cda[CTA_TIMEOUT-1])
943 ct->timeout.expires = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
945 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
946 ct->status |= IPS_CONFIRMED;
948 err = ctnetlink_change_status(ct, cda);
952 if (cda[CTA_PROTOINFO-1]) {
953 err = ctnetlink_change_protoinfo(ct, cda);
958 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
960 ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
963 ct->helper = ip_conntrack_helper_find_get(rtuple);
965 add_timer(&ct->timeout);
966 ip_conntrack_hash_insert(ct);
969 ip_conntrack_helper_put(ct->helper);
974 ip_conntrack_free(ct);
979 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
980 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
982 struct ip_conntrack_tuple otuple, rtuple;
983 struct ip_conntrack_tuple_hash *h = NULL;
986 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
989 if (cda[CTA_TUPLE_ORIG-1]) {
990 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG);
995 if (cda[CTA_TUPLE_REPLY-1]) {
996 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY);
1001 write_lock_bh(&ip_conntrack_lock);
1002 if (cda[CTA_TUPLE_ORIG-1])
1003 h = __ip_conntrack_find(&otuple, NULL);
1004 else if (cda[CTA_TUPLE_REPLY-1])
1005 h = __ip_conntrack_find(&rtuple, NULL);
1008 write_unlock_bh(&ip_conntrack_lock);
1010 if (nlh->nlmsg_flags & NLM_F_CREATE)
1011 err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
1014 /* implicit 'else' */
1016 /* we only allow nat config for new conntracks */
1017 if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
1022 /* We manipulate the conntrack inside the global conntrack table lock,
1023 * so there's no need to increase the refcount */
1025 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1026 err = ctnetlink_change_conntrack(tuplehash_to_ctrack(h), cda);
1029 write_unlock_bh(&ip_conntrack_lock);
1033 /***********************************************************************
1035 ***********************************************************************/
1038 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1039 const struct ip_conntrack_tuple *tuple,
1040 enum ctattr_expect type)
1042 struct nfattr *nest_parms = NFA_NEST(skb, type);
1044 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1045 goto nfattr_failure;
1047 NFA_NEST_END(skb, nest_parms);
1056 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1057 const struct ip_conntrack_tuple *tuple,
1058 const struct ip_conntrack_tuple *mask)
1061 struct ip_conntrack_protocol *proto;
1062 struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
1064 ret = ctnetlink_dump_tuples_ip(skb, mask);
1065 if (unlikely(ret < 0))
1066 goto nfattr_failure;
1068 proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
1069 ret = ctnetlink_dump_tuples_proto(skb, mask, proto);
1070 ip_conntrack_proto_put(proto);
1071 if (unlikely(ret < 0))
1072 goto nfattr_failure;
1074 NFA_NEST_END(skb, nest_parms);
1083 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1084 const struct ip_conntrack_expect *exp)
1086 struct ip_conntrack *master = exp->master;
1087 __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1088 __be32 id = htonl(exp->id);
1090 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1091 goto nfattr_failure;
1092 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1093 goto nfattr_failure;
1094 if (ctnetlink_exp_dump_tuple(skb,
1095 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1096 CTA_EXPECT_MASTER) < 0)
1097 goto nfattr_failure;
1099 NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(__be32), &timeout);
1100 NFA_PUT(skb, CTA_EXPECT_ID, sizeof(__be32), &id);
1109 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1112 const struct ip_conntrack_expect *exp)
1114 struct nlmsghdr *nlh;
1115 struct nfgenmsg *nfmsg;
1120 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1121 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1122 nfmsg = NLMSG_DATA(nlh);
1124 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1125 nfmsg->nfgen_family = AF_INET;
1126 nfmsg->version = NFNETLINK_V0;
1129 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1130 goto nfattr_failure;
1132 nlh->nlmsg_len = skb->tail - b;
1137 skb_trim(skb, b - skb->data);
1141 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1142 static int ctnetlink_expect_event(struct notifier_block *this,
1143 unsigned long events, void *ptr)
1145 struct nlmsghdr *nlh;
1146 struct nfgenmsg *nfmsg;
1147 struct ip_conntrack_expect *exp = (struct ip_conntrack_expect *)ptr;
1148 struct sk_buff *skb;
1153 if (events & IPEXP_NEW) {
1154 type = IPCTNL_MSG_EXP_NEW;
1155 flags = NLM_F_CREATE|NLM_F_EXCL;
1159 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1162 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1168 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1169 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1170 nfmsg = NLMSG_DATA(nlh);
1172 nlh->nlmsg_flags = flags;
1173 nfmsg->nfgen_family = AF_INET;
1174 nfmsg->version = NFNETLINK_V0;
1177 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1178 goto nfattr_failure;
1180 nlh->nlmsg_len = skb->tail - b;
1181 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1192 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1194 struct ip_conntrack_expect *exp = NULL;
1195 struct list_head *i;
1196 u_int32_t *id = (u_int32_t *) &cb->args[0];
1198 read_lock_bh(&ip_conntrack_lock);
1199 list_for_each_prev(i, &ip_conntrack_expect_list) {
1200 exp = (struct ip_conntrack_expect *) i;
1203 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1211 read_unlock_bh(&ip_conntrack_lock);
1216 static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
1217 [CTA_EXPECT_TIMEOUT-1] = sizeof(__be32),
1218 [CTA_EXPECT_ID-1] = sizeof(__be32)
1222 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1223 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1225 struct ip_conntrack_tuple tuple;
1226 struct ip_conntrack_expect *exp;
1227 struct sk_buff *skb2;
1230 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1233 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1234 struct nfgenmsg *msg = NLMSG_DATA(nlh);
1237 if (msg->nfgen_family != AF_INET)
1238 return -EAFNOSUPPORT;
1240 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
1241 ctnetlink_exp_dump_table,
1242 ctnetlink_done)) != 0)
1244 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1245 if (rlen > skb->len)
1247 skb_pull(skb, rlen);
1251 if (cda[CTA_EXPECT_MASTER-1])
1252 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER);
1259 exp = ip_conntrack_expect_find(&tuple);
1263 if (cda[CTA_EXPECT_ID-1]) {
1264 __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1265 if (exp->id != ntohl(id)) {
1266 ip_conntrack_expect_put(exp);
1272 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1275 NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
1277 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1278 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1283 ip_conntrack_expect_put(exp);
1285 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1290 ip_conntrack_expect_put(exp);
1295 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1296 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1298 struct ip_conntrack_expect *exp, *tmp;
1299 struct ip_conntrack_tuple tuple;
1300 struct ip_conntrack_helper *h;
1303 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1306 if (cda[CTA_EXPECT_TUPLE-1]) {
1307 /* delete a single expect by tuple */
1308 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1312 /* bump usage count to 2 */
1313 exp = ip_conntrack_expect_find(&tuple);
1317 if (cda[CTA_EXPECT_ID-1]) {
1319 *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1320 if (exp->id != ntohl(id)) {
1321 ip_conntrack_expect_put(exp);
1326 /* after list removal, usage count == 1 */
1327 ip_conntrack_unexpect_related(exp);
1328 /* have to put what we 'get' above.
1329 * after this line usage count == 0 */
1330 ip_conntrack_expect_put(exp);
1331 } else if (cda[CTA_EXPECT_HELP_NAME-1]) {
1332 char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
1334 /* delete all expectations for this helper */
1335 write_lock_bh(&ip_conntrack_lock);
1336 h = __ip_conntrack_helper_find_byname(name);
1338 write_unlock_bh(&ip_conntrack_lock);
1341 list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
1343 if (exp->master->helper == h
1344 && del_timer(&exp->timeout)) {
1345 ip_ct_unlink_expect(exp);
1346 ip_conntrack_expect_put(exp);
1349 write_unlock_bh(&ip_conntrack_lock);
1351 /* This basically means we have to flush everything*/
1352 write_lock_bh(&ip_conntrack_lock);
1353 list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
1355 if (del_timer(&exp->timeout)) {
1356 ip_ct_unlink_expect(exp);
1357 ip_conntrack_expect_put(exp);
1360 write_unlock_bh(&ip_conntrack_lock);
1366 ctnetlink_change_expect(struct ip_conntrack_expect *x, struct nfattr *cda[])
1372 ctnetlink_create_expect(struct nfattr *cda[])
1374 struct ip_conntrack_tuple tuple, mask, master_tuple;
1375 struct ip_conntrack_tuple_hash *h = NULL;
1376 struct ip_conntrack_expect *exp;
1377 struct ip_conntrack *ct;
1380 /* caller guarantees that those three CTA_EXPECT_* exist */
1381 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1384 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK);
1387 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER);
1391 /* Look for master conntrack of this expectation */
1392 h = ip_conntrack_find_get(&master_tuple, NULL);
1395 ct = tuplehash_to_ctrack(h);
1398 /* such conntrack hasn't got any helper, abort */
1403 exp = ip_conntrack_expect_alloc(ct);
1409 exp->expectfn = NULL;
1412 memcpy(&exp->tuple, &tuple, sizeof(struct ip_conntrack_tuple));
1413 memcpy(&exp->mask, &mask, sizeof(struct ip_conntrack_tuple));
1415 err = ip_conntrack_expect_related(exp);
1416 ip_conntrack_expect_put(exp);
1419 ip_conntrack_put(tuplehash_to_ctrack(h));
1424 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1425 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1427 struct ip_conntrack_tuple tuple;
1428 struct ip_conntrack_expect *exp;
1431 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1434 if (!cda[CTA_EXPECT_TUPLE-1]
1435 || !cda[CTA_EXPECT_MASK-1]
1436 || !cda[CTA_EXPECT_MASTER-1])
1439 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
1443 write_lock_bh(&ip_conntrack_lock);
1444 exp = __ip_conntrack_expect_find(&tuple);
1447 write_unlock_bh(&ip_conntrack_lock);
1449 if (nlh->nlmsg_flags & NLM_F_CREATE)
1450 err = ctnetlink_create_expect(cda);
1455 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1456 err = ctnetlink_change_expect(exp, cda);
1457 write_unlock_bh(&ip_conntrack_lock);
1462 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1463 static struct notifier_block ctnl_notifier = {
1464 .notifier_call = ctnetlink_conntrack_event,
1467 static struct notifier_block ctnl_notifier_exp = {
1468 .notifier_call = ctnetlink_expect_event,
1472 static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1473 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1474 .attr_count = CTA_MAX, },
1475 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1476 .attr_count = CTA_MAX, },
1477 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1478 .attr_count = CTA_MAX, },
1479 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1480 .attr_count = CTA_MAX, },
1483 static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1484 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1485 .attr_count = CTA_EXPECT_MAX, },
1486 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1487 .attr_count = CTA_EXPECT_MAX, },
1488 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1489 .attr_count = CTA_EXPECT_MAX, },
1492 static struct nfnetlink_subsystem ctnl_subsys = {
1493 .name = "conntrack",
1494 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1495 .cb_count = IPCTNL_MSG_MAX,
1499 static struct nfnetlink_subsystem ctnl_exp_subsys = {
1500 .name = "conntrack_expect",
1501 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1502 .cb_count = IPCTNL_MSG_EXP_MAX,
1506 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1507 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1509 static int __init ctnetlink_init(void)
1513 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1514 ret = nfnetlink_subsys_register(&ctnl_subsys);
1516 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1520 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1522 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1523 goto err_unreg_subsys;
1526 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1527 ret = ip_conntrack_register_notifier(&ctnl_notifier);
1529 printk("ctnetlink_init: cannot register notifier.\n");
1530 goto err_unreg_exp_subsys;
1533 ret = ip_conntrack_expect_register_notifier(&ctnl_notifier_exp);
1535 printk("ctnetlink_init: cannot expect register notifier.\n");
1536 goto err_unreg_notifier;
1542 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1544 ip_conntrack_unregister_notifier(&ctnl_notifier);
1545 err_unreg_exp_subsys:
1546 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1549 nfnetlink_subsys_unregister(&ctnl_subsys);
1554 static void __exit ctnetlink_exit(void)
1556 printk("ctnetlink: unregistering from nfnetlink.\n");
1558 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
1559 ip_conntrack_expect_unregister_notifier(&ctnl_notifier_exp);
1560 ip_conntrack_unregister_notifier(&ctnl_notifier);
1563 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1564 nfnetlink_subsys_unregister(&ctnl_subsys);
1568 module_init(ctnetlink_init);
1569 module_exit(ctnetlink_exit);