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/netlink.h>
37 #include <net/netfilter/nf_conntrack.h>
38 #include <net/netfilter/nf_conntrack_core.h>
39 #include <net/netfilter/nf_conntrack_expect.h>
40 #include <net/netfilter/nf_conntrack_helper.h>
41 #include <net/netfilter/nf_conntrack_l3proto.h>
42 #include <net/netfilter/nf_conntrack_l4proto.h>
43 #include <net/netfilter/nf_conntrack_tuple.h>
44 #ifdef CONFIG_NF_NAT_NEEDED
45 #include <net/netfilter/nf_nat_core.h>
46 #include <net/netfilter/nf_nat_protocol.h>
49 #include <linux/netfilter/nfnetlink.h>
50 #include <linux/netfilter/nfnetlink_conntrack.h>
52 MODULE_LICENSE("GPL");
54 static char __initdata version[] = "0.93";
57 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
58 const struct nf_conntrack_tuple *tuple,
59 struct nf_conntrack_l4proto *l4proto)
62 struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
64 NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
66 if (likely(l4proto->tuple_to_nfattr))
67 ret = l4proto->tuple_to_nfattr(skb, tuple);
69 NFA_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 nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
85 if (likely(l3proto->tuple_to_nfattr))
86 ret = l3proto->tuple_to_nfattr(skb, tuple);
88 NFA_NEST_END(skb, nest_parms);
97 ctnetlink_dump_tuples(struct sk_buff *skb,
98 const struct nf_conntrack_tuple *tuple)
101 struct nf_conntrack_l3proto *l3proto;
102 struct nf_conntrack_l4proto *l4proto;
104 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
105 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
106 nf_ct_l3proto_put(l3proto);
108 if (unlikely(ret < 0))
111 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
112 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
113 nf_ct_l4proto_put(l4proto);
119 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
121 __be32 status = htonl((u_int32_t) ct->status);
122 NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
130 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
132 long timeout_l = ct->timeout.expires - jiffies;
138 timeout = htonl(timeout_l / HZ);
140 NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
148 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
150 struct nf_conntrack_l4proto *l4proto = nf_ct_l4proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
151 struct nfattr *nest_proto;
154 if (!l4proto->to_nfattr) {
155 nf_ct_l4proto_put(l4proto);
159 nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
161 ret = l4proto->to_nfattr(skb, nest_proto, ct);
163 nf_ct_l4proto_put(l4proto);
165 NFA_NEST_END(skb, nest_proto);
170 nf_ct_l4proto_put(l4proto);
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 __be32 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 __be32 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 __be32 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;
272 unsigned char *b = skb_tail_pointer(skb);
274 event |= NFNL_SUBSYS_CTNETLINK << 8;
275 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
276 nfmsg = NLMSG_DATA(nlh);
278 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
279 nfmsg->nfgen_family =
280 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
281 nfmsg->version = NFNETLINK_V0;
284 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
285 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
287 NFA_NEST_END(skb, nest_parms);
289 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
290 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
292 NFA_NEST_END(skb, nest_parms);
294 if (ctnetlink_dump_status(skb, ct) < 0 ||
295 ctnetlink_dump_timeout(skb, ct) < 0 ||
296 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
297 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
298 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
299 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
300 ctnetlink_dump_mark(skb, ct) < 0 ||
301 ctnetlink_dump_id(skb, ct) < 0 ||
302 ctnetlink_dump_use(skb, ct) < 0)
305 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
314 #ifdef CONFIG_NF_CONNTRACK_EVENTS
315 static int ctnetlink_conntrack_event(struct notifier_block *this,
316 unsigned long events, void *ptr)
318 struct nlmsghdr *nlh;
319 struct nfgenmsg *nfmsg;
320 struct nfattr *nest_parms;
321 struct nf_conn *ct = (struct nf_conn *)ptr;
325 unsigned int flags = 0, group;
327 /* ignore our fake conntrack entry */
328 if (ct == &nf_conntrack_untracked)
331 if (events & IPCT_DESTROY) {
332 type = IPCTNL_MSG_CT_DELETE;
333 group = NFNLGRP_CONNTRACK_DESTROY;
334 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
335 type = IPCTNL_MSG_CT_NEW;
336 flags = NLM_F_CREATE|NLM_F_EXCL;
337 group = NFNLGRP_CONNTRACK_NEW;
338 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
339 type = IPCTNL_MSG_CT_NEW;
340 group = NFNLGRP_CONNTRACK_UPDATE;
344 if (!nfnetlink_has_listeners(group))
347 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
353 type |= NFNL_SUBSYS_CTNETLINK << 8;
354 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
355 nfmsg = NLMSG_DATA(nlh);
357 nlh->nlmsg_flags = flags;
358 nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
359 nfmsg->version = NFNETLINK_V0;
362 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
363 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
365 NFA_NEST_END(skb, nest_parms);
367 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
368 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
370 NFA_NEST_END(skb, nest_parms);
372 if (events & IPCT_DESTROY) {
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 (ctnetlink_dump_status(skb, ct) < 0)
380 if (ctnetlink_dump_timeout(skb, ct) < 0)
383 if (events & IPCT_PROTOINFO
384 && ctnetlink_dump_protoinfo(skb, ct) < 0)
387 if ((events & IPCT_HELPER || nfct_help(ct))
388 && ctnetlink_dump_helpinfo(skb, ct) < 0)
391 #ifdef CONFIG_NF_CONNTRACK_MARK
392 if ((events & IPCT_MARK || ct->mark)
393 && ctnetlink_dump_mark(skb, ct) < 0)
397 if (events & IPCT_COUNTER_FILLING &&
398 (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
399 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
403 nlh->nlmsg_len = skb->tail - b;
404 nfnetlink_send(skb, 0, group, 0);
412 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
414 static int ctnetlink_done(struct netlink_callback *cb)
417 nf_ct_put((struct nf_conn *)cb->args[1]);
421 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
424 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
426 struct nf_conn *ct, *last;
427 struct nf_conntrack_tuple_hash *h;
429 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
430 u_int8_t l3proto = nfmsg->nfgen_family;
432 read_lock_bh(&nf_conntrack_lock);
433 last = (struct nf_conn *)cb->args[1];
434 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
436 list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
437 h = (struct nf_conntrack_tuple_hash *) i;
438 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
440 ct = nf_ct_tuplehash_to_ctrack(h);
441 /* Dump entries of a given L3 protocol number.
442 * If it is not specified, ie. l3proto == 0,
443 * then dump everything. */
444 if (l3proto && L3PROTO(ct) != l3proto)
451 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
455 nf_conntrack_get(&ct->ct_general);
456 cb->args[1] = (unsigned long)ct;
459 #ifdef CONFIG_NF_CT_ACCT
460 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
461 IPCTNL_MSG_CT_GET_CTRZERO)
462 memset(&ct->counters, 0, sizeof(ct->counters));
471 read_unlock_bh(&nf_conntrack_lock);
479 ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple)
481 struct nfattr *tb[CTA_IP_MAX];
482 struct nf_conntrack_l3proto *l3proto;
485 nfattr_parse_nested(tb, CTA_IP_MAX, attr);
487 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
489 if (likely(l3proto->nfattr_to_tuple))
490 ret = l3proto->nfattr_to_tuple(tb, tuple);
492 nf_ct_l3proto_put(l3proto);
497 static const size_t cta_min_proto[CTA_PROTO_MAX] = {
498 [CTA_PROTO_NUM-1] = sizeof(u_int8_t),
502 ctnetlink_parse_tuple_proto(struct nfattr *attr,
503 struct nf_conntrack_tuple *tuple)
505 struct nfattr *tb[CTA_PROTO_MAX];
506 struct nf_conntrack_l4proto *l4proto;
509 nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
511 if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
514 if (!tb[CTA_PROTO_NUM-1])
516 tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
518 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
520 if (likely(l4proto->nfattr_to_tuple))
521 ret = l4proto->nfattr_to_tuple(tb, tuple);
523 nf_ct_l4proto_put(l4proto);
529 ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple,
530 enum ctattr_tuple type, u_int8_t l3num)
532 struct nfattr *tb[CTA_TUPLE_MAX];
535 memset(tuple, 0, sizeof(*tuple));
537 nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
539 if (!tb[CTA_TUPLE_IP-1])
542 tuple->src.l3num = l3num;
544 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
548 if (!tb[CTA_TUPLE_PROTO-1])
551 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
555 /* orig and expect tuples get DIR_ORIGINAL */
556 if (type == CTA_TUPLE_REPLY)
557 tuple->dst.dir = IP_CT_DIR_REPLY;
559 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
564 #ifdef CONFIG_NF_NAT_NEEDED
565 static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
566 [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t),
567 [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t),
570 static int nfnetlink_parse_nat_proto(struct nfattr *attr,
571 const struct nf_conn *ct,
572 struct nf_nat_range *range)
574 struct nfattr *tb[CTA_PROTONAT_MAX];
575 struct nf_nat_protocol *npt;
577 nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
579 if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
582 npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
584 if (!npt->nfattr_to_range) {
585 nf_nat_proto_put(npt);
589 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
590 if (npt->nfattr_to_range(tb, range) > 0)
591 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
593 nf_nat_proto_put(npt);
598 static const size_t cta_min_nat[CTA_NAT_MAX] = {
599 [CTA_NAT_MINIP-1] = sizeof(u_int32_t),
600 [CTA_NAT_MAXIP-1] = sizeof(u_int32_t),
604 nfnetlink_parse_nat(struct nfattr *nat,
605 const struct nf_conn *ct, struct nf_nat_range *range)
607 struct nfattr *tb[CTA_NAT_MAX];
610 memset(range, 0, sizeof(*range));
612 nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
614 if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
617 if (tb[CTA_NAT_MINIP-1])
618 range->min_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
620 if (!tb[CTA_NAT_MAXIP-1])
621 range->max_ip = range->min_ip;
623 range->max_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
626 range->flags |= IP_NAT_RANGE_MAP_IPS;
628 if (!tb[CTA_NAT_PROTO-1])
631 err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
640 ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
642 struct nfattr *tb[CTA_HELP_MAX];
644 nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
646 if (!tb[CTA_HELP_NAME-1])
649 *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
654 static const size_t cta_min[CTA_MAX] = {
655 [CTA_STATUS-1] = sizeof(u_int32_t),
656 [CTA_TIMEOUT-1] = sizeof(u_int32_t),
657 [CTA_MARK-1] = sizeof(u_int32_t),
658 [CTA_USE-1] = sizeof(u_int32_t),
659 [CTA_ID-1] = sizeof(u_int32_t)
663 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
664 struct nlmsghdr *nlh, struct nfattr *cda[])
666 struct nf_conntrack_tuple_hash *h;
667 struct nf_conntrack_tuple tuple;
669 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
670 u_int8_t u3 = nfmsg->nfgen_family;
673 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
676 if (cda[CTA_TUPLE_ORIG-1])
677 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
678 else if (cda[CTA_TUPLE_REPLY-1])
679 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
681 /* Flush the whole table */
682 nf_conntrack_flush();
689 h = nf_conntrack_find_get(&tuple, NULL);
693 ct = nf_ct_tuplehash_to_ctrack(h);
696 u_int32_t id = ntohl(*(__be32 *)NFA_DATA(cda[CTA_ID-1]));
702 if (del_timer(&ct->timeout))
703 ct->timeout.function((unsigned long)ct);
711 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
712 struct nlmsghdr *nlh, struct nfattr *cda[])
714 struct nf_conntrack_tuple_hash *h;
715 struct nf_conntrack_tuple tuple;
717 struct sk_buff *skb2 = NULL;
718 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
719 u_int8_t u3 = nfmsg->nfgen_family;
722 if (nlh->nlmsg_flags & NLM_F_DUMP) {
723 #ifndef CONFIG_NF_CT_ACCT
724 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
727 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
731 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
734 if (cda[CTA_TUPLE_ORIG-1])
735 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
736 else if (cda[CTA_TUPLE_REPLY-1])
737 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
744 h = nf_conntrack_find_get(&tuple, NULL);
748 ct = nf_ct_tuplehash_to_ctrack(h);
751 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
757 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
758 IPCTNL_MSG_CT_NEW, 1, ct);
763 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
776 ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[])
779 unsigned int status = ntohl(*(__be32 *)NFA_DATA(cda[CTA_STATUS-1]));
780 d = ct->status ^ status;
782 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
786 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
787 /* SEEN_REPLY bit can only be set */
791 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
792 /* ASSURED bit can only be set */
795 if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
796 #ifndef CONFIG_NF_NAT_NEEDED
799 struct nf_nat_range range;
801 if (cda[CTA_NAT_DST-1]) {
802 if (nfnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
805 if (nf_nat_initialized(ct,
806 HOOK2MANIP(NF_IP_PRE_ROUTING)))
808 nf_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
810 if (cda[CTA_NAT_SRC-1]) {
811 if (nfnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
814 if (nf_nat_initialized(ct,
815 HOOK2MANIP(NF_IP_POST_ROUTING)))
817 nf_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
822 /* Be careful here, modifying NAT bits can screw up things,
823 * so don't let users modify them directly if they don't pass
825 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
831 ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[])
833 struct nf_conntrack_helper *helper;
834 struct nf_conn_help *help = nfct_help(ct);
839 /* FIXME: we need to reallocate and rehash */
843 /* don't change helper of sibling connections */
847 err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
851 helper = __nf_conntrack_helper_find_byname(helpname);
853 if (!strcmp(helpname, ""))
861 /* we had a helper before ... */
862 nf_ct_remove_expectations(ct);
865 /* need to zero data of old helper */
866 memset(&help->help, 0, sizeof(help->help));
870 help->helper = helper;
876 ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[])
878 u_int32_t timeout = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
880 if (!del_timer(&ct->timeout))
883 ct->timeout.expires = jiffies + timeout * HZ;
884 add_timer(&ct->timeout);
890 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[])
892 struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
893 struct nf_conntrack_l4proto *l4proto;
894 u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
895 u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
898 nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
900 l4proto = nf_ct_l4proto_find_get(l3num, npt);
902 if (l4proto->from_nfattr)
903 err = l4proto->from_nfattr(tb, ct);
904 nf_ct_l4proto_put(l4proto);
910 ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[])
914 if (cda[CTA_HELP-1]) {
915 err = ctnetlink_change_helper(ct, cda);
920 if (cda[CTA_TIMEOUT-1]) {
921 err = ctnetlink_change_timeout(ct, cda);
926 if (cda[CTA_STATUS-1]) {
927 err = ctnetlink_change_status(ct, cda);
932 if (cda[CTA_PROTOINFO-1]) {
933 err = ctnetlink_change_protoinfo(ct, cda);
938 #if defined(CONFIG_NF_CONNTRACK_MARK)
940 ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
947 ctnetlink_create_conntrack(struct nfattr *cda[],
948 struct nf_conntrack_tuple *otuple,
949 struct nf_conntrack_tuple *rtuple)
953 struct nf_conn_help *help;
955 ct = nf_conntrack_alloc(otuple, rtuple);
956 if (ct == NULL || IS_ERR(ct))
959 if (!cda[CTA_TIMEOUT-1])
961 ct->timeout.expires = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
963 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
964 ct->status |= IPS_CONFIRMED;
966 if (cda[CTA_STATUS-1]) {
967 err = ctnetlink_change_status(ct, cda);
972 if (cda[CTA_PROTOINFO-1]) {
973 err = ctnetlink_change_protoinfo(ct, cda);
978 #if defined(CONFIG_NF_CONNTRACK_MARK)
980 ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
983 help = nfct_help(ct);
985 help->helper = nf_ct_helper_find_get(rtuple);
987 add_timer(&ct->timeout);
988 nf_conntrack_hash_insert(ct);
990 if (help && help->helper)
991 nf_ct_helper_put(help->helper);
996 nf_conntrack_free(ct);
1001 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1002 struct nlmsghdr *nlh, struct nfattr *cda[])
1004 struct nf_conntrack_tuple otuple, rtuple;
1005 struct nf_conntrack_tuple_hash *h = NULL;
1006 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1007 u_int8_t u3 = nfmsg->nfgen_family;
1010 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
1013 if (cda[CTA_TUPLE_ORIG-1]) {
1014 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1019 if (cda[CTA_TUPLE_REPLY-1]) {
1020 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1025 write_lock_bh(&nf_conntrack_lock);
1026 if (cda[CTA_TUPLE_ORIG-1])
1027 h = __nf_conntrack_find(&otuple, NULL);
1028 else if (cda[CTA_TUPLE_REPLY-1])
1029 h = __nf_conntrack_find(&rtuple, NULL);
1032 write_unlock_bh(&nf_conntrack_lock);
1034 if (nlh->nlmsg_flags & NLM_F_CREATE)
1035 err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
1038 /* implicit 'else' */
1040 /* we only allow nat config for new conntracks */
1041 if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
1046 /* We manipulate the conntrack inside the global conntrack table lock,
1047 * so there's no need to increase the refcount */
1049 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1050 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda);
1053 write_unlock_bh(&nf_conntrack_lock);
1057 /***********************************************************************
1059 ***********************************************************************/
1062 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1063 const struct nf_conntrack_tuple *tuple,
1064 enum ctattr_expect type)
1066 struct nfattr *nest_parms = NFA_NEST(skb, type);
1068 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1069 goto nfattr_failure;
1071 NFA_NEST_END(skb, nest_parms);
1080 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1081 const struct nf_conntrack_tuple *tuple,
1082 const struct nf_conntrack_tuple *mask)
1085 struct nf_conntrack_l3proto *l3proto;
1086 struct nf_conntrack_l4proto *l4proto;
1087 struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
1089 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1090 ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto);
1091 nf_ct_l3proto_put(l3proto);
1093 if (unlikely(ret < 0))
1094 goto nfattr_failure;
1096 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1097 ret = ctnetlink_dump_tuples_proto(skb, mask, l4proto);
1098 nf_ct_l4proto_put(l4proto);
1099 if (unlikely(ret < 0))
1100 goto nfattr_failure;
1102 NFA_NEST_END(skb, nest_parms);
1111 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1112 const struct nf_conntrack_expect *exp)
1114 struct nf_conn *master = exp->master;
1115 __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1116 __be32 id = htonl(exp->id);
1118 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1119 goto nfattr_failure;
1120 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1121 goto nfattr_failure;
1122 if (ctnetlink_exp_dump_tuple(skb,
1123 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1124 CTA_EXPECT_MASTER) < 0)
1125 goto nfattr_failure;
1127 NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1128 NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1137 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1140 const struct nf_conntrack_expect *exp)
1142 struct nlmsghdr *nlh;
1143 struct nfgenmsg *nfmsg;
1144 unsigned char *b = skb_tail_pointer(skb);
1146 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1147 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1148 nfmsg = NLMSG_DATA(nlh);
1150 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1151 nfmsg->nfgen_family = exp->tuple.src.l3num;
1152 nfmsg->version = NFNETLINK_V0;
1155 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1156 goto nfattr_failure;
1158 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1167 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1168 static int ctnetlink_expect_event(struct notifier_block *this,
1169 unsigned long events, void *ptr)
1171 struct nlmsghdr *nlh;
1172 struct nfgenmsg *nfmsg;
1173 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1174 struct sk_buff *skb;
1179 if (events & IPEXP_NEW) {
1180 type = IPCTNL_MSG_EXP_NEW;
1181 flags = NLM_F_CREATE|NLM_F_EXCL;
1185 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1188 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1194 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1195 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1196 nfmsg = NLMSG_DATA(nlh);
1198 nlh->nlmsg_flags = flags;
1199 nfmsg->nfgen_family = exp->tuple.src.l3num;
1200 nfmsg->version = NFNETLINK_V0;
1203 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1204 goto nfattr_failure;
1206 nlh->nlmsg_len = skb->tail - b;
1207 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1218 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1220 struct nf_conntrack_expect *exp = NULL;
1221 struct list_head *i;
1222 u_int32_t *id = (u_int32_t *) &cb->args[0];
1223 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1224 u_int8_t l3proto = nfmsg->nfgen_family;
1226 read_lock_bh(&nf_conntrack_lock);
1227 list_for_each_prev(i, &nf_conntrack_expect_list) {
1228 exp = (struct nf_conntrack_expect *) i;
1229 if (l3proto && exp->tuple.src.l3num != l3proto)
1233 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1241 read_unlock_bh(&nf_conntrack_lock);
1246 static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
1247 [CTA_EXPECT_TIMEOUT-1] = sizeof(u_int32_t),
1248 [CTA_EXPECT_ID-1] = sizeof(u_int32_t)
1252 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1253 struct nlmsghdr *nlh, struct nfattr *cda[])
1255 struct nf_conntrack_tuple tuple;
1256 struct nf_conntrack_expect *exp;
1257 struct sk_buff *skb2;
1258 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1259 u_int8_t u3 = nfmsg->nfgen_family;
1262 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1265 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1266 return netlink_dump_start(ctnl, skb, nlh,
1267 ctnetlink_exp_dump_table,
1271 if (cda[CTA_EXPECT_MASTER-1])
1272 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1279 exp = nf_conntrack_expect_find_get(&tuple);
1283 if (cda[CTA_EXPECT_ID-1]) {
1284 __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1285 if (exp->id != ntohl(id)) {
1286 nf_conntrack_expect_put(exp);
1292 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1296 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1297 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1302 nf_conntrack_expect_put(exp);
1304 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1309 nf_conntrack_expect_put(exp);
1314 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1315 struct nlmsghdr *nlh, struct nfattr *cda[])
1317 struct nf_conntrack_expect *exp, *tmp;
1318 struct nf_conntrack_tuple tuple;
1319 struct nf_conntrack_helper *h;
1320 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1321 u_int8_t u3 = nfmsg->nfgen_family;
1324 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1327 if (cda[CTA_EXPECT_TUPLE-1]) {
1328 /* delete a single expect by tuple */
1329 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1333 /* bump usage count to 2 */
1334 exp = nf_conntrack_expect_find_get(&tuple);
1338 if (cda[CTA_EXPECT_ID-1]) {
1339 __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1340 if (exp->id != ntohl(id)) {
1341 nf_conntrack_expect_put(exp);
1346 /* after list removal, usage count == 1 */
1347 nf_conntrack_unexpect_related(exp);
1348 /* have to put what we 'get' above.
1349 * after this line usage count == 0 */
1350 nf_conntrack_expect_put(exp);
1351 } else if (cda[CTA_EXPECT_HELP_NAME-1]) {
1352 char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
1354 /* delete all expectations for this helper */
1355 write_lock_bh(&nf_conntrack_lock);
1356 h = __nf_conntrack_helper_find_byname(name);
1358 write_unlock_bh(&nf_conntrack_lock);
1361 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1363 struct nf_conn_help *m_help = nfct_help(exp->master);
1364 if (m_help->helper == h
1365 && del_timer(&exp->timeout)) {
1366 nf_ct_unlink_expect(exp);
1367 nf_conntrack_expect_put(exp);
1370 write_unlock_bh(&nf_conntrack_lock);
1372 /* This basically means we have to flush everything*/
1373 write_lock_bh(&nf_conntrack_lock);
1374 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1376 if (del_timer(&exp->timeout)) {
1377 nf_ct_unlink_expect(exp);
1378 nf_conntrack_expect_put(exp);
1381 write_unlock_bh(&nf_conntrack_lock);
1387 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[])
1393 ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3)
1395 struct nf_conntrack_tuple tuple, mask, master_tuple;
1396 struct nf_conntrack_tuple_hash *h = NULL;
1397 struct nf_conntrack_expect *exp;
1399 struct nf_conn_help *help;
1402 /* caller guarantees that those three CTA_EXPECT_* exist */
1403 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1406 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1409 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1413 /* Look for master conntrack of this expectation */
1414 h = nf_conntrack_find_get(&master_tuple, NULL);
1417 ct = nf_ct_tuplehash_to_ctrack(h);
1418 help = nfct_help(ct);
1420 if (!help || !help->helper) {
1421 /* such conntrack hasn't got any helper, abort */
1426 exp = nf_conntrack_expect_alloc(ct);
1432 exp->expectfn = NULL;
1436 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1437 memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple));
1439 err = nf_conntrack_expect_related(exp);
1440 nf_conntrack_expect_put(exp);
1443 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1448 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1449 struct nlmsghdr *nlh, struct nfattr *cda[])
1451 struct nf_conntrack_tuple tuple;
1452 struct nf_conntrack_expect *exp;
1453 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1454 u_int8_t u3 = nfmsg->nfgen_family;
1457 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1460 if (!cda[CTA_EXPECT_TUPLE-1]
1461 || !cda[CTA_EXPECT_MASK-1]
1462 || !cda[CTA_EXPECT_MASTER-1])
1465 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1469 write_lock_bh(&nf_conntrack_lock);
1470 exp = __nf_conntrack_expect_find(&tuple);
1473 write_unlock_bh(&nf_conntrack_lock);
1475 if (nlh->nlmsg_flags & NLM_F_CREATE)
1476 err = ctnetlink_create_expect(cda, u3);
1481 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1482 err = ctnetlink_change_expect(exp, cda);
1483 write_unlock_bh(&nf_conntrack_lock);
1488 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1489 static struct notifier_block ctnl_notifier = {
1490 .notifier_call = ctnetlink_conntrack_event,
1493 static struct notifier_block ctnl_notifier_exp = {
1494 .notifier_call = ctnetlink_expect_event,
1498 static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1499 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1500 .attr_count = CTA_MAX, },
1501 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1502 .attr_count = CTA_MAX, },
1503 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1504 .attr_count = CTA_MAX, },
1505 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1506 .attr_count = CTA_MAX, },
1509 static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1510 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1511 .attr_count = CTA_EXPECT_MAX, },
1512 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1513 .attr_count = CTA_EXPECT_MAX, },
1514 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1515 .attr_count = CTA_EXPECT_MAX, },
1518 static struct nfnetlink_subsystem ctnl_subsys = {
1519 .name = "conntrack",
1520 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1521 .cb_count = IPCTNL_MSG_MAX,
1525 static struct nfnetlink_subsystem ctnl_exp_subsys = {
1526 .name = "conntrack_expect",
1527 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1528 .cb_count = IPCTNL_MSG_EXP_MAX,
1532 MODULE_ALIAS("ip_conntrack_netlink");
1533 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1534 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1536 static int __init ctnetlink_init(void)
1540 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1541 ret = nfnetlink_subsys_register(&ctnl_subsys);
1543 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1547 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1549 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1550 goto err_unreg_subsys;
1553 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1554 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1556 printk("ctnetlink_init: cannot register notifier.\n");
1557 goto err_unreg_exp_subsys;
1560 ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp);
1562 printk("ctnetlink_init: cannot expect register notifier.\n");
1563 goto err_unreg_notifier;
1569 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1571 nf_conntrack_unregister_notifier(&ctnl_notifier);
1572 err_unreg_exp_subsys:
1573 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1576 nfnetlink_subsys_unregister(&ctnl_subsys);
1581 static void __exit ctnetlink_exit(void)
1583 printk("ctnetlink: unregistering from nfnetlink.\n");
1585 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1586 nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp);
1587 nf_conntrack_unregister_notifier(&ctnl_notifier);
1590 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1591 nfnetlink_subsys_unregister(&ctnl_subsys);
1595 module_init(ctnetlink_init);
1596 module_exit(ctnetlink_exit);