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/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/skbuff.h>
26 #include <linux/errno.h>
27 #include <linux/netlink.h>
28 #include <linux/spinlock.h>
29 #include <linux/interrupt.h>
30 #include <linux/notifier.h>
32 #include <linux/netfilter.h>
33 #include <net/netlink.h>
34 #include <net/netfilter/nf_conntrack.h>
35 #include <net/netfilter/nf_conntrack_core.h>
36 #include <net/netfilter/nf_conntrack_expect.h>
37 #include <net/netfilter/nf_conntrack_helper.h>
38 #include <net/netfilter/nf_conntrack_l3proto.h>
39 #include <net/netfilter/nf_conntrack_l4proto.h>
40 #include <net/netfilter/nf_conntrack_tuple.h>
41 #include <net/netfilter/nf_conntrack_acct.h>
42 #ifdef CONFIG_NF_NAT_NEEDED
43 #include <net/netfilter/nf_nat_core.h>
44 #include <net/netfilter/nf_nat_protocol.h>
47 #include <linux/netfilter/nfnetlink.h>
48 #include <linux/netfilter/nfnetlink_conntrack.h>
50 MODULE_LICENSE("GPL");
52 static char __initdata version[] = "0.93";
55 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
56 const struct nf_conntrack_tuple *tuple,
57 struct nf_conntrack_l4proto *l4proto)
60 struct nlattr *nest_parms;
62 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
65 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
67 if (likely(l4proto->tuple_to_nlattr))
68 ret = l4proto->tuple_to_nlattr(skb, tuple);
70 nla_nest_end(skb, nest_parms);
79 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
80 const struct nf_conntrack_tuple *tuple,
81 struct nf_conntrack_l3proto *l3proto)
84 struct nlattr *nest_parms;
86 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
90 if (likely(l3proto->tuple_to_nlattr))
91 ret = l3proto->tuple_to_nlattr(skb, tuple);
93 nla_nest_end(skb, nest_parms);
102 ctnetlink_dump_tuples(struct sk_buff *skb,
103 const struct nf_conntrack_tuple *tuple)
106 struct nf_conntrack_l3proto *l3proto;
107 struct nf_conntrack_l4proto *l4proto;
109 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
110 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
112 if (unlikely(ret < 0))
115 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
116 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
122 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
124 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
132 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
134 long timeout = (ct->timeout.expires - jiffies) / HZ;
139 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
147 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
149 struct nf_conntrack_l4proto *l4proto;
150 struct nlattr *nest_proto;
153 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
154 if (!l4proto->to_nlattr)
157 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
159 goto nla_put_failure;
161 ret = l4proto->to_nlattr(skb, nest_proto, ct);
163 nla_nest_end(skb, nest_proto);
172 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
174 struct nlattr *nest_helper;
175 const struct nf_conn_help *help = nfct_help(ct);
176 struct nf_conntrack_helper *helper;
181 helper = rcu_dereference(help->helper);
185 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
187 goto nla_put_failure;
188 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
190 if (helper->to_nlattr)
191 helper->to_nlattr(skb, ct);
193 nla_nest_end(skb, nest_helper);
202 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
203 enum ip_conntrack_dir dir)
205 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
206 struct nlattr *nest_count;
207 const struct nf_conn_counter *acct;
209 acct = nf_conn_acct_find(ct);
213 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
215 goto nla_put_failure;
217 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
218 cpu_to_be64(acct[dir].packets));
219 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
220 cpu_to_be64(acct[dir].bytes));
222 nla_nest_end(skb, nest_count);
230 #ifdef CONFIG_NF_CONNTRACK_MARK
232 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
234 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
241 #define ctnetlink_dump_mark(a, b) (0)
244 #ifdef CONFIG_NF_CONNTRACK_SECMARK
246 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
248 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
255 #define ctnetlink_dump_secmark(a, b) (0)
258 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
261 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
263 struct nlattr *nest_parms;
265 if (!(ct->status & IPS_EXPECTED))
268 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
270 goto nla_put_failure;
271 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
272 goto nla_put_failure;
273 nla_nest_end(skb, nest_parms);
281 #ifdef CONFIG_NF_NAT_NEEDED
283 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
285 struct nlattr *nest_parms;
287 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
289 goto nla_put_failure;
291 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
292 htonl(natseq->correction_pos));
293 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
294 htonl(natseq->offset_before));
295 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
296 htonl(natseq->offset_after));
298 nla_nest_end(skb, nest_parms);
307 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
309 struct nf_nat_seq *natseq;
310 struct nf_conn_nat *nat = nfct_nat(ct);
312 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
315 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
316 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
319 natseq = &nat->seq[IP_CT_DIR_REPLY];
320 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
326 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
330 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
332 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
340 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
342 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
349 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
352 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
353 int event, int nowait,
354 const struct nf_conn *ct)
356 struct nlmsghdr *nlh;
357 struct nfgenmsg *nfmsg;
358 struct nlattr *nest_parms;
359 unsigned char *b = skb_tail_pointer(skb);
361 event |= NFNL_SUBSYS_CTNETLINK << 8;
362 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
363 nfmsg = NLMSG_DATA(nlh);
365 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
366 nfmsg->nfgen_family = nf_ct_l3num(ct);
367 nfmsg->version = NFNETLINK_V0;
370 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
372 goto nla_put_failure;
373 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
374 goto nla_put_failure;
375 nla_nest_end(skb, nest_parms);
377 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
379 goto nla_put_failure;
380 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
381 goto nla_put_failure;
382 nla_nest_end(skb, nest_parms);
384 if (ctnetlink_dump_status(skb, ct) < 0 ||
385 ctnetlink_dump_timeout(skb, ct) < 0 ||
386 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
387 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
388 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
389 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
390 ctnetlink_dump_mark(skb, ct) < 0 ||
391 ctnetlink_dump_secmark(skb, ct) < 0 ||
392 ctnetlink_dump_id(skb, ct) < 0 ||
393 ctnetlink_dump_use(skb, ct) < 0 ||
394 ctnetlink_dump_master(skb, ct) < 0 ||
395 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
396 goto nla_put_failure;
398 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
407 #ifdef CONFIG_NF_CONNTRACK_EVENTS
408 static int ctnetlink_conntrack_event(struct notifier_block *this,
409 unsigned long events, void *ptr)
411 struct nlmsghdr *nlh;
412 struct nfgenmsg *nfmsg;
413 struct nlattr *nest_parms;
414 struct nf_ct_event *item = (struct nf_ct_event *)ptr;
415 struct nf_conn *ct = item->ct;
419 unsigned int flags = 0, group;
421 /* ignore our fake conntrack entry */
422 if (ct == &nf_conntrack_untracked)
425 if (events & IPCT_DESTROY) {
426 type = IPCTNL_MSG_CT_DELETE;
427 group = NFNLGRP_CONNTRACK_DESTROY;
428 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
429 type = IPCTNL_MSG_CT_NEW;
430 flags = NLM_F_CREATE|NLM_F_EXCL;
431 group = NFNLGRP_CONNTRACK_NEW;
432 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
433 type = IPCTNL_MSG_CT_NEW;
434 group = NFNLGRP_CONNTRACK_UPDATE;
438 if (!item->report && !nfnetlink_has_listeners(group))
441 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
447 type |= NFNL_SUBSYS_CTNETLINK << 8;
448 nlh = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
449 nfmsg = NLMSG_DATA(nlh);
451 nlh->nlmsg_flags = flags;
452 nfmsg->nfgen_family = nf_ct_l3num(ct);
453 nfmsg->version = NFNETLINK_V0;
457 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
459 goto nla_put_failure;
460 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
461 goto nla_put_failure;
462 nla_nest_end(skb, nest_parms);
464 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
466 goto nla_put_failure;
467 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
468 goto nla_put_failure;
469 nla_nest_end(skb, nest_parms);
471 if (ctnetlink_dump_id(skb, ct) < 0)
472 goto nla_put_failure;
474 if (ctnetlink_dump_status(skb, ct) < 0)
475 goto nla_put_failure;
477 if (events & IPCT_DESTROY) {
478 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
479 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
480 goto nla_put_failure;
482 if (ctnetlink_dump_timeout(skb, ct) < 0)
483 goto nla_put_failure;
485 if (events & IPCT_PROTOINFO
486 && ctnetlink_dump_protoinfo(skb, ct) < 0)
487 goto nla_put_failure;
489 if ((events & IPCT_HELPER || nfct_help(ct))
490 && ctnetlink_dump_helpinfo(skb, ct) < 0)
491 goto nla_put_failure;
493 #ifdef CONFIG_NF_CONNTRACK_SECMARK
494 if ((events & IPCT_SECMARK || ct->secmark)
495 && ctnetlink_dump_secmark(skb, ct) < 0)
496 goto nla_put_failure;
499 if (events & IPCT_RELATED &&
500 ctnetlink_dump_master(skb, ct) < 0)
501 goto nla_put_failure;
503 if (events & IPCT_NATSEQADJ &&
504 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
505 goto nla_put_failure;
508 #ifdef CONFIG_NF_CONNTRACK_MARK
509 if ((events & IPCT_MARK || ct->mark)
510 && ctnetlink_dump_mark(skb, ct) < 0)
511 goto nla_put_failure;
515 nlh->nlmsg_len = skb->tail - b;
516 nfnetlink_send(skb, item->pid, group, item->report);
522 nfnetlink_set_err(0, group, -ENOBUFS);
526 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
528 static int ctnetlink_done(struct netlink_callback *cb)
531 nf_ct_put((struct nf_conn *)cb->args[1]);
536 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
538 struct nf_conn *ct, *last;
539 struct nf_conntrack_tuple_hash *h;
540 struct hlist_nulls_node *n;
541 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
542 u_int8_t l3proto = nfmsg->nfgen_family;
545 last = (struct nf_conn *)cb->args[1];
546 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
548 hlist_nulls_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
550 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
552 ct = nf_ct_tuplehash_to_ctrack(h);
553 if (!atomic_inc_not_zero(&ct->ct_general.use))
555 /* Dump entries of a given L3 protocol number.
556 * If it is not specified, ie. l3proto == 0,
557 * then dump everything. */
558 if (l3proto && nf_ct_l3num(ct) != l3proto)
565 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
569 cb->args[1] = (unsigned long)ct;
573 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
574 IPCTNL_MSG_CT_GET_CTRZERO) {
575 struct nf_conn_counter *acct;
577 acct = nf_conn_acct_find(ct);
579 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
598 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
600 struct nlattr *tb[CTA_IP_MAX+1];
601 struct nf_conntrack_l3proto *l3proto;
604 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
607 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
609 if (likely(l3proto->nlattr_to_tuple)) {
610 ret = nla_validate_nested(attr, CTA_IP_MAX,
611 l3proto->nla_policy);
613 ret = l3proto->nlattr_to_tuple(tb, tuple);
621 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
622 [CTA_PROTO_NUM] = { .type = NLA_U8 },
626 ctnetlink_parse_tuple_proto(struct nlattr *attr,
627 struct nf_conntrack_tuple *tuple)
629 struct nlattr *tb[CTA_PROTO_MAX+1];
630 struct nf_conntrack_l4proto *l4proto;
633 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
637 if (!tb[CTA_PROTO_NUM])
639 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
642 l4proto = __nf_ct_l4proto_find(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);
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,
741 h = nf_conntrack_find_get(&init_net, &tuple);
745 ct = nf_ct_tuplehash_to_ctrack(h);
748 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
749 if (id != (u32)(unsigned long)ct) {
755 nf_conntrack_event_report(IPCT_DESTROY,
760 /* death_by_timeout would report the event again */
761 set_bit(IPS_DYING_BIT, &ct->status);
770 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
771 struct nlmsghdr *nlh, struct nlattr *cda[])
773 struct nf_conntrack_tuple_hash *h;
774 struct nf_conntrack_tuple tuple;
776 struct sk_buff *skb2 = NULL;
777 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
778 u_int8_t u3 = nfmsg->nfgen_family;
781 if (nlh->nlmsg_flags & NLM_F_DUMP)
782 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
785 if (cda[CTA_TUPLE_ORIG])
786 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
787 else if (cda[CTA_TUPLE_REPLY])
788 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
795 h = nf_conntrack_find_get(&init_net, &tuple);
799 ct = nf_ct_tuplehash_to_ctrack(h);
802 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
809 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
810 IPCTNL_MSG_CT_NEW, 1, ct);
816 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
828 #ifdef CONFIG_NF_NAT_NEEDED
830 ctnetlink_parse_nat_setup(struct nf_conn *ct,
831 enum nf_nat_manip_type manip,
834 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
836 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
837 if (!parse_nat_setup) {
838 #ifdef CONFIG_MODULES
840 spin_unlock_bh(&nf_conntrack_lock);
842 if (request_module("nf-nat-ipv4") < 0) {
844 spin_lock_bh(&nf_conntrack_lock);
849 spin_lock_bh(&nf_conntrack_lock);
851 if (nfnetlink_parse_nat_setup_hook)
857 return parse_nat_setup(ct, manip, attr);
862 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
865 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
866 d = ct->status ^ status;
868 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
872 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
873 /* SEEN_REPLY bit can only be set */
876 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
877 /* ASSURED bit can only be set */
880 /* Be careful here, modifying NAT bits can screw up things,
881 * so don't let users modify them directly if they don't pass
883 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
888 ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[])
890 #ifdef CONFIG_NF_NAT_NEEDED
893 if (cda[CTA_NAT_DST]) {
894 ret = ctnetlink_parse_nat_setup(ct,
900 if (cda[CTA_NAT_SRC]) {
901 ret = ctnetlink_parse_nat_setup(ct,
914 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
916 struct nf_conntrack_helper *helper;
917 struct nf_conn_help *help = nfct_help(ct);
921 /* don't change helper of sibling connections */
925 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
929 if (!strcmp(helpname, "")) {
930 if (help && help->helper) {
931 /* we had a helper before ... */
932 nf_ct_remove_expectations(ct);
933 rcu_assign_pointer(help->helper, NULL);
939 helper = __nf_conntrack_helper_find_byname(helpname);
940 if (helper == NULL) {
941 #ifdef CONFIG_MODULES
942 spin_unlock_bh(&nf_conntrack_lock);
944 if (request_module("nfct-helper-%s", helpname) < 0) {
945 spin_lock_bh(&nf_conntrack_lock);
949 spin_lock_bh(&nf_conntrack_lock);
950 helper = __nf_conntrack_helper_find_byname(helpname);
958 if (help->helper == helper)
962 /* need to zero data of old helper */
963 memset(&help->help, 0, sizeof(help->help));
965 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
970 rcu_assign_pointer(help->helper, helper);
976 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
978 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
980 if (!del_timer(&ct->timeout))
983 ct->timeout.expires = jiffies + timeout * HZ;
984 add_timer(&ct->timeout);
990 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
992 struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
993 struct nf_conntrack_l4proto *l4proto;
996 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
999 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1000 if (l4proto->from_nlattr)
1001 err = l4proto->from_nlattr(tb, ct);
1007 #ifdef CONFIG_NF_NAT_NEEDED
1009 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1011 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1013 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1015 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1018 natseq->correction_pos =
1019 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1021 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1024 natseq->offset_before =
1025 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1027 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1030 natseq->offset_after =
1031 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1037 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1040 struct nf_conn_nat *nat = nfct_nat(ct);
1045 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1046 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1047 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1051 ct->status |= IPS_SEQ_ADJUST;
1054 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1055 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1056 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1060 ct->status |= IPS_SEQ_ADJUST;
1068 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1072 /* only allow NAT changes and master assignation for new conntracks */
1073 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1076 if (cda[CTA_HELP]) {
1077 err = ctnetlink_change_helper(ct, cda);
1082 if (cda[CTA_TIMEOUT]) {
1083 err = ctnetlink_change_timeout(ct, cda);
1088 if (cda[CTA_STATUS]) {
1089 err = ctnetlink_change_status(ct, cda);
1094 if (cda[CTA_PROTOINFO]) {
1095 err = ctnetlink_change_protoinfo(ct, cda);
1100 #if defined(CONFIG_NF_CONNTRACK_MARK)
1102 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1105 #ifdef CONFIG_NF_NAT_NEEDED
1106 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1107 err = ctnetlink_change_nat_seq_adj(ct, cda);
1117 ctnetlink_event_report(struct nf_conn *ct, u32 pid, int report)
1119 unsigned int events = 0;
1121 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1122 events |= IPCT_RELATED;
1126 nf_conntrack_event_report(IPCT_STATUS |
1138 static struct nf_conn *
1139 ctnetlink_create_conntrack(struct nlattr *cda[],
1140 struct nf_conntrack_tuple *otuple,
1141 struct nf_conntrack_tuple *rtuple,
1146 struct nf_conntrack_helper *helper;
1148 ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_ATOMIC);
1150 return ERR_PTR(-ENOMEM);
1152 if (!cda[CTA_TIMEOUT])
1154 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1156 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1157 ct->status |= IPS_CONFIRMED;
1160 if (cda[CTA_HELP]) {
1163 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1167 helper = __nf_conntrack_helper_find_byname(helpname);
1168 if (helper == NULL) {
1170 #ifdef CONFIG_MODULES
1171 if (request_module("nfct-helper-%s", helpname) < 0) {
1177 helper = __nf_conntrack_helper_find_byname(helpname);
1187 struct nf_conn_help *help;
1189 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1195 /* not in hash table yet so not strictly necessary */
1196 rcu_assign_pointer(help->helper, helper);
1199 /* try an implicit helper assignation */
1200 err = __nf_ct_try_assign_helper(ct, GFP_ATOMIC);
1205 if (cda[CTA_STATUS]) {
1206 err = ctnetlink_change_status(ct, cda);
1211 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1212 err = ctnetlink_change_nat(ct, cda);
1217 #ifdef CONFIG_NF_NAT_NEEDED
1218 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1219 err = ctnetlink_change_nat_seq_adj(ct, cda);
1225 if (cda[CTA_PROTOINFO]) {
1226 err = ctnetlink_change_protoinfo(ct, cda);
1231 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1233 #if defined(CONFIG_NF_CONNTRACK_MARK)
1235 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1238 /* setup master conntrack: this is a confirmed expectation */
1239 if (cda[CTA_TUPLE_MASTER]) {
1240 struct nf_conntrack_tuple master;
1241 struct nf_conntrack_tuple_hash *master_h;
1242 struct nf_conn *master_ct;
1244 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1248 master_h = nf_conntrack_find_get(&init_net, &master);
1249 if (master_h == NULL) {
1253 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1254 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1255 ct->master = master_ct;
1258 add_timer(&ct->timeout);
1259 nf_conntrack_hash_insert(ct);
1267 nf_conntrack_free(ct);
1268 return ERR_PTR(err);
1272 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1273 struct nlmsghdr *nlh, struct nlattr *cda[])
1275 struct nf_conntrack_tuple otuple, rtuple;
1276 struct nf_conntrack_tuple_hash *h = NULL;
1277 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1278 u_int8_t u3 = nfmsg->nfgen_family;
1281 if (cda[CTA_TUPLE_ORIG]) {
1282 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1287 if (cda[CTA_TUPLE_REPLY]) {
1288 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1293 spin_lock_bh(&nf_conntrack_lock);
1294 if (cda[CTA_TUPLE_ORIG])
1295 h = __nf_conntrack_find(&init_net, &otuple);
1296 else if (cda[CTA_TUPLE_REPLY])
1297 h = __nf_conntrack_find(&init_net, &rtuple);
1301 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1304 ct = ctnetlink_create_conntrack(cda, &otuple,
1311 nf_conntrack_get(&ct->ct_general);
1312 spin_unlock_bh(&nf_conntrack_lock);
1313 ctnetlink_event_report(ct,
1314 NETLINK_CB(skb).pid,
1318 spin_unlock_bh(&nf_conntrack_lock);
1322 /* implicit 'else' */
1324 /* We manipulate the conntrack inside the global conntrack table lock,
1325 * so there's no need to increase the refcount */
1327 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1328 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1330 err = ctnetlink_change_conntrack(ct, cda);
1332 nf_conntrack_get(&ct->ct_general);
1333 spin_unlock_bh(&nf_conntrack_lock);
1334 ctnetlink_event_report(ct,
1335 NETLINK_CB(skb).pid,
1339 spin_unlock_bh(&nf_conntrack_lock);
1345 spin_unlock_bh(&nf_conntrack_lock);
1349 /***********************************************************************
1351 ***********************************************************************/
1354 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1355 const struct nf_conntrack_tuple *tuple,
1356 enum ctattr_expect type)
1358 struct nlattr *nest_parms;
1360 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1362 goto nla_put_failure;
1363 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1364 goto nla_put_failure;
1365 nla_nest_end(skb, nest_parms);
1374 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1375 const struct nf_conntrack_tuple *tuple,
1376 const struct nf_conntrack_tuple_mask *mask)
1379 struct nf_conntrack_l3proto *l3proto;
1380 struct nf_conntrack_l4proto *l4proto;
1381 struct nf_conntrack_tuple m;
1382 struct nlattr *nest_parms;
1384 memset(&m, 0xFF, sizeof(m));
1385 m.src.u.all = mask->src.u.all;
1386 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1388 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1390 goto nla_put_failure;
1392 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1393 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1395 if (unlikely(ret < 0))
1396 goto nla_put_failure;
1398 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1399 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1400 if (unlikely(ret < 0))
1401 goto nla_put_failure;
1403 nla_nest_end(skb, nest_parms);
1412 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1413 const struct nf_conntrack_expect *exp)
1415 struct nf_conn *master = exp->master;
1416 long timeout = (exp->timeout.expires - jiffies) / HZ;
1421 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1422 goto nla_put_failure;
1423 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1424 goto nla_put_failure;
1425 if (ctnetlink_exp_dump_tuple(skb,
1426 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1427 CTA_EXPECT_MASTER) < 0)
1428 goto nla_put_failure;
1430 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1431 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1440 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1443 const struct nf_conntrack_expect *exp)
1445 struct nlmsghdr *nlh;
1446 struct nfgenmsg *nfmsg;
1447 unsigned char *b = skb_tail_pointer(skb);
1449 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1450 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1451 nfmsg = NLMSG_DATA(nlh);
1453 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1454 nfmsg->nfgen_family = exp->tuple.src.l3num;
1455 nfmsg->version = NFNETLINK_V0;
1458 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1459 goto nla_put_failure;
1461 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1470 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1471 static int ctnetlink_expect_event(struct notifier_block *this,
1472 unsigned long events, void *ptr)
1474 struct nlmsghdr *nlh;
1475 struct nfgenmsg *nfmsg;
1476 struct nf_exp_event *item = (struct nf_exp_event *)ptr;
1477 struct nf_conntrack_expect *exp = item->exp;
1478 struct sk_buff *skb;
1483 if (events & IPEXP_NEW) {
1484 type = IPCTNL_MSG_EXP_NEW;
1485 flags = NLM_F_CREATE|NLM_F_EXCL;
1489 if (!item->report &&
1490 !nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1493 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1499 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1500 nlh = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
1501 nfmsg = NLMSG_DATA(nlh);
1503 nlh->nlmsg_flags = flags;
1504 nfmsg->nfgen_family = exp->tuple.src.l3num;
1505 nfmsg->version = NFNETLINK_V0;
1509 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1510 goto nla_put_failure;
1513 nlh->nlmsg_len = skb->tail - b;
1514 nfnetlink_send(skb, item->pid, NFNLGRP_CONNTRACK_EXP_NEW, item->report);
1520 nfnetlink_set_err(0, 0, -ENOBUFS);
1525 static int ctnetlink_exp_done(struct netlink_callback *cb)
1528 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1533 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1535 struct net *net = &init_net;
1536 struct nf_conntrack_expect *exp, *last;
1537 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1538 struct hlist_node *n;
1539 u_int8_t l3proto = nfmsg->nfgen_family;
1542 last = (struct nf_conntrack_expect *)cb->args[1];
1543 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1545 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1547 if (l3proto && exp->tuple.src.l3num != l3proto)
1554 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1558 if (!atomic_inc_not_zero(&exp->use))
1560 cb->args[1] = (unsigned long)exp;
1572 nf_ct_expect_put(last);
1577 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1578 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1579 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1583 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1584 struct nlmsghdr *nlh, struct nlattr *cda[])
1586 struct nf_conntrack_tuple tuple;
1587 struct nf_conntrack_expect *exp;
1588 struct sk_buff *skb2;
1589 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1590 u_int8_t u3 = nfmsg->nfgen_family;
1593 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1594 return netlink_dump_start(ctnl, skb, nlh,
1595 ctnetlink_exp_dump_table,
1596 ctnetlink_exp_done);
1599 if (cda[CTA_EXPECT_MASTER])
1600 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1607 exp = nf_ct_expect_find_get(&init_net, &tuple);
1611 if (cda[CTA_EXPECT_ID]) {
1612 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1613 if (ntohl(id) != (u32)(unsigned long)exp) {
1614 nf_ct_expect_put(exp);
1620 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1625 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1626 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1632 nf_ct_expect_put(exp);
1634 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1639 nf_ct_expect_put(exp);
1644 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1645 struct nlmsghdr *nlh, struct nlattr *cda[])
1647 struct nf_conntrack_expect *exp;
1648 struct nf_conntrack_tuple tuple;
1649 struct nf_conntrack_helper *h;
1650 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1651 struct hlist_node *n, *next;
1652 u_int8_t u3 = nfmsg->nfgen_family;
1656 if (cda[CTA_EXPECT_TUPLE]) {
1657 /* delete a single expect by tuple */
1658 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1662 /* bump usage count to 2 */
1663 exp = nf_ct_expect_find_get(&init_net, &tuple);
1667 if (cda[CTA_EXPECT_ID]) {
1668 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1669 if (ntohl(id) != (u32)(unsigned long)exp) {
1670 nf_ct_expect_put(exp);
1675 /* after list removal, usage count == 1 */
1676 nf_ct_unexpect_related(exp);
1677 /* have to put what we 'get' above.
1678 * after this line usage count == 0 */
1679 nf_ct_expect_put(exp);
1680 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1681 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1682 struct nf_conn_help *m_help;
1684 /* delete all expectations for this helper */
1685 spin_lock_bh(&nf_conntrack_lock);
1686 h = __nf_conntrack_helper_find_byname(name);
1688 spin_unlock_bh(&nf_conntrack_lock);
1691 for (i = 0; i < nf_ct_expect_hsize; i++) {
1692 hlist_for_each_entry_safe(exp, n, next,
1693 &init_net.ct.expect_hash[i],
1695 m_help = nfct_help(exp->master);
1696 if (m_help->helper == h
1697 && del_timer(&exp->timeout)) {
1698 nf_ct_unlink_expect(exp);
1699 nf_ct_expect_put(exp);
1703 spin_unlock_bh(&nf_conntrack_lock);
1705 /* This basically means we have to flush everything*/
1706 spin_lock_bh(&nf_conntrack_lock);
1707 for (i = 0; i < nf_ct_expect_hsize; i++) {
1708 hlist_for_each_entry_safe(exp, n, next,
1709 &init_net.ct.expect_hash[i],
1711 if (del_timer(&exp->timeout)) {
1712 nf_ct_unlink_expect(exp);
1713 nf_ct_expect_put(exp);
1717 spin_unlock_bh(&nf_conntrack_lock);
1723 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1729 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3, u32 pid, int report)
1731 struct nf_conntrack_tuple tuple, mask, master_tuple;
1732 struct nf_conntrack_tuple_hash *h = NULL;
1733 struct nf_conntrack_expect *exp;
1735 struct nf_conn_help *help;
1738 /* caller guarantees that those three CTA_EXPECT_* exist */
1739 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1742 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1745 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1749 /* Look for master conntrack of this expectation */
1750 h = nf_conntrack_find_get(&init_net, &master_tuple);
1753 ct = nf_ct_tuplehash_to_ctrack(h);
1754 help = nfct_help(ct);
1756 if (!help || !help->helper) {
1757 /* such conntrack hasn't got any helper, abort */
1762 exp = nf_ct_expect_alloc(ct);
1768 exp->expectfn = NULL;
1772 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1773 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1774 exp->mask.src.u.all = mask.src.u.all;
1776 err = nf_ct_expect_related_report(exp, pid, report);
1777 nf_ct_expect_put(exp);
1780 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1785 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1786 struct nlmsghdr *nlh, struct nlattr *cda[])
1788 struct nf_conntrack_tuple tuple;
1789 struct nf_conntrack_expect *exp;
1790 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1791 u_int8_t u3 = nfmsg->nfgen_family;
1794 if (!cda[CTA_EXPECT_TUPLE]
1795 || !cda[CTA_EXPECT_MASK]
1796 || !cda[CTA_EXPECT_MASTER])
1799 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1803 spin_lock_bh(&nf_conntrack_lock);
1804 exp = __nf_ct_expect_find(&init_net, &tuple);
1807 spin_unlock_bh(&nf_conntrack_lock);
1809 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1810 err = ctnetlink_create_expect(cda,
1812 NETLINK_CB(skb).pid,
1819 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1820 err = ctnetlink_change_expect(exp, cda);
1821 spin_unlock_bh(&nf_conntrack_lock);
1826 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1827 static struct notifier_block ctnl_notifier = {
1828 .notifier_call = ctnetlink_conntrack_event,
1831 static struct notifier_block ctnl_notifier_exp = {
1832 .notifier_call = ctnetlink_expect_event,
1836 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1837 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1838 .attr_count = CTA_MAX,
1839 .policy = ct_nla_policy },
1840 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1841 .attr_count = CTA_MAX,
1842 .policy = ct_nla_policy },
1843 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1844 .attr_count = CTA_MAX,
1845 .policy = ct_nla_policy },
1846 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1847 .attr_count = CTA_MAX,
1848 .policy = ct_nla_policy },
1851 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1852 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1853 .attr_count = CTA_EXPECT_MAX,
1854 .policy = exp_nla_policy },
1855 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1856 .attr_count = CTA_EXPECT_MAX,
1857 .policy = exp_nla_policy },
1858 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1859 .attr_count = CTA_EXPECT_MAX,
1860 .policy = exp_nla_policy },
1863 static const struct nfnetlink_subsystem ctnl_subsys = {
1864 .name = "conntrack",
1865 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1866 .cb_count = IPCTNL_MSG_MAX,
1870 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1871 .name = "conntrack_expect",
1872 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1873 .cb_count = IPCTNL_MSG_EXP_MAX,
1877 MODULE_ALIAS("ip_conntrack_netlink");
1878 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1879 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1881 static int __init ctnetlink_init(void)
1885 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1886 ret = nfnetlink_subsys_register(&ctnl_subsys);
1888 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1892 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1894 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1895 goto err_unreg_subsys;
1898 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1899 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1901 printk("ctnetlink_init: cannot register notifier.\n");
1902 goto err_unreg_exp_subsys;
1905 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1907 printk("ctnetlink_init: cannot expect register notifier.\n");
1908 goto err_unreg_notifier;
1914 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1916 nf_conntrack_unregister_notifier(&ctnl_notifier);
1917 err_unreg_exp_subsys:
1918 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1921 nfnetlink_subsys_unregister(&ctnl_subsys);
1926 static void __exit ctnetlink_exit(void)
1928 printk("ctnetlink: unregistering from nfnetlink.\n");
1930 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1931 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1932 nf_conntrack_unregister_notifier(&ctnl_notifier);
1935 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1936 nfnetlink_subsys_unregister(&ctnl_subsys);
1940 module_init(ctnetlink_init);
1941 module_exit(ctnetlink_exit);