1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org>
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/types.h>
23 #include <linux/timer.h>
24 #include <linux/skbuff.h>
25 #include <linux/errno.h>
26 #include <linux/netlink.h>
27 #include <linux/spinlock.h>
28 #include <linux/interrupt.h>
29 #include <linux/notifier.h>
31 #include <linux/netfilter.h>
32 #include <net/netlink.h>
33 #include <net/netfilter/nf_conntrack.h>
34 #include <net/netfilter/nf_conntrack_core.h>
35 #include <net/netfilter/nf_conntrack_expect.h>
36 #include <net/netfilter/nf_conntrack_helper.h>
37 #include <net/netfilter/nf_conntrack_l3proto.h>
38 #include <net/netfilter/nf_conntrack_l4proto.h>
39 #include <net/netfilter/nf_conntrack_tuple.h>
40 #include <net/netfilter/nf_conntrack_acct.h>
41 #ifdef CONFIG_NF_NAT_NEEDED
42 #include <net/netfilter/nf_nat_core.h>
43 #include <net/netfilter/nf_nat_protocol.h>
46 #include <linux/netfilter/nfnetlink.h>
47 #include <linux/netfilter/nfnetlink_conntrack.h>
49 MODULE_LICENSE("GPL");
51 static char __initdata version[] = "0.93";
54 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
55 const struct nf_conntrack_tuple *tuple,
56 struct nf_conntrack_l4proto *l4proto)
59 struct nlattr *nest_parms;
61 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
64 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
66 if (likely(l4proto->tuple_to_nlattr))
67 ret = l4proto->tuple_to_nlattr(skb, tuple);
69 nla_nest_end(skb, nest_parms);
78 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
79 const struct nf_conntrack_tuple *tuple,
80 struct nf_conntrack_l3proto *l3proto)
83 struct nlattr *nest_parms;
85 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
89 if (likely(l3proto->tuple_to_nlattr))
90 ret = l3proto->tuple_to_nlattr(skb, tuple);
92 nla_nest_end(skb, nest_parms);
101 ctnetlink_dump_tuples(struct sk_buff *skb,
102 const struct nf_conntrack_tuple *tuple)
105 struct nf_conntrack_l3proto *l3proto;
106 struct nf_conntrack_l4proto *l4proto;
108 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
109 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
111 if (unlikely(ret < 0))
114 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
115 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
121 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
123 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
131 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
133 long timeout = (ct->timeout.expires - jiffies) / HZ;
138 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
146 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
148 struct nf_conntrack_l4proto *l4proto;
149 struct nlattr *nest_proto;
152 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
153 if (!l4proto->to_nlattr)
156 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
158 goto nla_put_failure;
160 ret = l4proto->to_nlattr(skb, nest_proto, ct);
162 nla_nest_end(skb, nest_proto);
171 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
173 struct nlattr *nest_helper;
174 const struct nf_conn_help *help = nfct_help(ct);
175 struct nf_conntrack_helper *helper;
180 helper = rcu_dereference(help->helper);
184 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
186 goto nla_put_failure;
187 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
189 if (helper->to_nlattr)
190 helper->to_nlattr(skb, ct);
192 nla_nest_end(skb, nest_helper);
201 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
202 enum ip_conntrack_dir dir)
204 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
205 struct nlattr *nest_count;
206 const struct nf_conn_counter *acct;
208 acct = nf_conn_acct_find(ct);
212 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
214 goto nla_put_failure;
216 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
217 cpu_to_be64(acct[dir].packets));
218 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
219 cpu_to_be64(acct[dir].bytes));
221 nla_nest_end(skb, nest_count);
229 #ifdef CONFIG_NF_CONNTRACK_MARK
231 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
233 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
240 #define ctnetlink_dump_mark(a, b) (0)
243 #ifdef CONFIG_NF_CONNTRACK_SECMARK
245 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
247 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
254 #define ctnetlink_dump_secmark(a, b) (0)
257 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
260 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
262 struct nlattr *nest_parms;
264 if (!(ct->status & IPS_EXPECTED))
267 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
269 goto nla_put_failure;
270 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
271 goto nla_put_failure;
272 nla_nest_end(skb, nest_parms);
280 #ifdef CONFIG_NF_NAT_NEEDED
282 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
284 struct nlattr *nest_parms;
286 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
288 goto nla_put_failure;
290 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
291 htonl(natseq->correction_pos));
292 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
293 htonl(natseq->offset_before));
294 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
295 htonl(natseq->offset_after));
297 nla_nest_end(skb, nest_parms);
306 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
308 struct nf_nat_seq *natseq;
309 struct nf_conn_nat *nat = nfct_nat(ct);
311 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
314 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
315 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
318 natseq = &nat->seq[IP_CT_DIR_REPLY];
319 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
325 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
329 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
331 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
339 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
341 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
348 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
351 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
352 int event, int nowait,
353 const struct nf_conn *ct)
355 struct nlmsghdr *nlh;
356 struct nfgenmsg *nfmsg;
357 struct nlattr *nest_parms;
358 unsigned char *b = skb_tail_pointer(skb);
360 event |= NFNL_SUBSYS_CTNETLINK << 8;
361 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
362 nfmsg = NLMSG_DATA(nlh);
364 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
365 nfmsg->nfgen_family = nf_ct_l3num(ct);
366 nfmsg->version = NFNETLINK_V0;
369 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
371 goto nla_put_failure;
372 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
373 goto nla_put_failure;
374 nla_nest_end(skb, nest_parms);
376 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
378 goto nla_put_failure;
379 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
380 goto nla_put_failure;
381 nla_nest_end(skb, nest_parms);
383 if (ctnetlink_dump_status(skb, ct) < 0 ||
384 ctnetlink_dump_timeout(skb, ct) < 0 ||
385 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
386 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
387 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
388 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
389 ctnetlink_dump_mark(skb, ct) < 0 ||
390 ctnetlink_dump_secmark(skb, ct) < 0 ||
391 ctnetlink_dump_id(skb, ct) < 0 ||
392 ctnetlink_dump_use(skb, ct) < 0 ||
393 ctnetlink_dump_master(skb, ct) < 0 ||
394 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
395 goto nla_put_failure;
397 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
406 #ifdef CONFIG_NF_CONNTRACK_EVENTS
407 static int ctnetlink_conntrack_event(struct notifier_block *this,
408 unsigned long events, void *ptr)
410 struct nlmsghdr *nlh;
411 struct nfgenmsg *nfmsg;
412 struct nlattr *nest_parms;
413 struct nf_ct_event *item = (struct nf_ct_event *)ptr;
414 struct nf_conn *ct = item->ct;
418 unsigned int flags = 0, group;
420 /* ignore our fake conntrack entry */
421 if (ct == &nf_conntrack_untracked)
424 if (events & IPCT_DESTROY) {
425 type = IPCTNL_MSG_CT_DELETE;
426 group = NFNLGRP_CONNTRACK_DESTROY;
427 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
428 type = IPCTNL_MSG_CT_NEW;
429 flags = NLM_F_CREATE|NLM_F_EXCL;
430 group = NFNLGRP_CONNTRACK_NEW;
431 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
432 type = IPCTNL_MSG_CT_NEW;
433 group = NFNLGRP_CONNTRACK_UPDATE;
437 if (!item->report && !nfnetlink_has_listeners(group))
440 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
446 type |= NFNL_SUBSYS_CTNETLINK << 8;
447 nlh = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
448 nfmsg = NLMSG_DATA(nlh);
450 nlh->nlmsg_flags = flags;
451 nfmsg->nfgen_family = nf_ct_l3num(ct);
452 nfmsg->version = NFNETLINK_V0;
456 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
458 goto nla_put_failure;
459 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
460 goto nla_put_failure;
461 nla_nest_end(skb, nest_parms);
463 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
465 goto nla_put_failure;
466 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
467 goto nla_put_failure;
468 nla_nest_end(skb, nest_parms);
470 if (ctnetlink_dump_id(skb, ct) < 0)
471 goto nla_put_failure;
473 if (ctnetlink_dump_status(skb, ct) < 0)
474 goto nla_put_failure;
476 if (events & IPCT_DESTROY) {
477 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
478 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
479 goto nla_put_failure;
481 if (ctnetlink_dump_timeout(skb, ct) < 0)
482 goto nla_put_failure;
484 if (events & IPCT_PROTOINFO
485 && ctnetlink_dump_protoinfo(skb, ct) < 0)
486 goto nla_put_failure;
488 if ((events & IPCT_HELPER || nfct_help(ct))
489 && ctnetlink_dump_helpinfo(skb, ct) < 0)
490 goto nla_put_failure;
492 #ifdef CONFIG_NF_CONNTRACK_SECMARK
493 if ((events & IPCT_SECMARK || ct->secmark)
494 && ctnetlink_dump_secmark(skb, ct) < 0)
495 goto nla_put_failure;
498 if (events & IPCT_RELATED &&
499 ctnetlink_dump_master(skb, ct) < 0)
500 goto nla_put_failure;
502 if (events & IPCT_NATSEQADJ &&
503 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
504 goto nla_put_failure;
507 #ifdef CONFIG_NF_CONNTRACK_MARK
508 if ((events & IPCT_MARK || ct->mark)
509 && ctnetlink_dump_mark(skb, ct) < 0)
510 goto nla_put_failure;
514 nlh->nlmsg_len = skb->tail - b;
515 nfnetlink_send(skb, item->pid, group, item->report);
524 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
526 static int ctnetlink_done(struct netlink_callback *cb)
529 nf_ct_put((struct nf_conn *)cb->args[1]);
534 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
536 struct nf_conn *ct, *last;
537 struct nf_conntrack_tuple_hash *h;
538 struct hlist_node *n;
539 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
540 u_int8_t l3proto = nfmsg->nfgen_family;
543 last = (struct nf_conn *)cb->args[1];
544 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
546 hlist_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
548 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
550 ct = nf_ct_tuplehash_to_ctrack(h);
551 /* Dump entries of a given L3 protocol number.
552 * If it is not specified, ie. l3proto == 0,
553 * then dump everything. */
554 if (l3proto && nf_ct_l3num(ct) != l3proto)
561 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
565 if (!atomic_inc_not_zero(&ct->ct_general.use))
567 cb->args[1] = (unsigned long)ct;
571 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
572 IPCTNL_MSG_CT_GET_CTRZERO) {
573 struct nf_conn_counter *acct;
575 acct = nf_conn_acct_find(ct);
577 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
594 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
596 struct nlattr *tb[CTA_IP_MAX+1];
597 struct nf_conntrack_l3proto *l3proto;
600 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
603 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
605 if (likely(l3proto->nlattr_to_tuple)) {
606 ret = nla_validate_nested(attr, CTA_IP_MAX,
607 l3proto->nla_policy);
609 ret = l3proto->nlattr_to_tuple(tb, tuple);
617 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
618 [CTA_PROTO_NUM] = { .type = NLA_U8 },
622 ctnetlink_parse_tuple_proto(struct nlattr *attr,
623 struct nf_conntrack_tuple *tuple)
625 struct nlattr *tb[CTA_PROTO_MAX+1];
626 struct nf_conntrack_l4proto *l4proto;
629 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
633 if (!tb[CTA_PROTO_NUM])
635 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
638 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
640 if (likely(l4proto->nlattr_to_tuple)) {
641 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
642 l4proto->nla_policy);
644 ret = l4proto->nlattr_to_tuple(tb, tuple);
653 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
654 enum ctattr_tuple type, u_int8_t l3num)
656 struct nlattr *tb[CTA_TUPLE_MAX+1];
659 memset(tuple, 0, sizeof(*tuple));
661 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
663 if (!tb[CTA_TUPLE_IP])
666 tuple->src.l3num = l3num;
668 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
672 if (!tb[CTA_TUPLE_PROTO])
675 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
679 /* orig and expect tuples get DIR_ORIGINAL */
680 if (type == CTA_TUPLE_REPLY)
681 tuple->dst.dir = IP_CT_DIR_REPLY;
683 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
689 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
691 struct nlattr *tb[CTA_HELP_MAX+1];
693 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
695 if (!tb[CTA_HELP_NAME])
698 *helper_name = nla_data(tb[CTA_HELP_NAME]);
703 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
704 [CTA_STATUS] = { .type = NLA_U32 },
705 [CTA_TIMEOUT] = { .type = NLA_U32 },
706 [CTA_MARK] = { .type = NLA_U32 },
707 [CTA_USE] = { .type = NLA_U32 },
708 [CTA_ID] = { .type = NLA_U32 },
712 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
713 struct nlmsghdr *nlh, struct nlattr *cda[])
715 struct nf_conntrack_tuple_hash *h;
716 struct nf_conntrack_tuple tuple;
718 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
719 u_int8_t u3 = nfmsg->nfgen_family;
722 if (cda[CTA_TUPLE_ORIG])
723 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
724 else if (cda[CTA_TUPLE_REPLY])
725 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
727 /* Flush the whole table */
728 nf_conntrack_flush(&init_net,
737 h = nf_conntrack_find_get(&init_net, &tuple);
741 ct = nf_ct_tuplehash_to_ctrack(h);
744 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
745 if (id != (u32)(unsigned long)ct) {
751 nf_conntrack_event_report(IPCT_DESTROY,
756 /* death_by_timeout would report the event again */
757 set_bit(IPS_DYING_BIT, &ct->status);
766 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
767 struct nlmsghdr *nlh, struct nlattr *cda[])
769 struct nf_conntrack_tuple_hash *h;
770 struct nf_conntrack_tuple tuple;
772 struct sk_buff *skb2 = NULL;
773 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
774 u_int8_t u3 = nfmsg->nfgen_family;
777 if (nlh->nlmsg_flags & NLM_F_DUMP)
778 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
781 if (cda[CTA_TUPLE_ORIG])
782 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
783 else if (cda[CTA_TUPLE_REPLY])
784 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
791 h = nf_conntrack_find_get(&init_net, &tuple);
795 ct = nf_ct_tuplehash_to_ctrack(h);
798 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
805 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
806 IPCTNL_MSG_CT_NEW, 1, ct);
812 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
824 #ifdef CONFIG_NF_NAT_NEEDED
826 ctnetlink_parse_nat_setup(struct nf_conn *ct,
827 enum nf_nat_manip_type manip,
830 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
832 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
833 if (!parse_nat_setup) {
834 #ifdef CONFIG_MODULES
836 spin_unlock_bh(&nf_conntrack_lock);
838 if (request_module("nf-nat-ipv4") < 0) {
840 spin_lock_bh(&nf_conntrack_lock);
845 spin_lock_bh(&nf_conntrack_lock);
847 if (nfnetlink_parse_nat_setup_hook)
853 return parse_nat_setup(ct, manip, attr);
858 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
861 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
862 d = ct->status ^ status;
864 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
868 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
869 /* SEEN_REPLY bit can only be set */
872 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
873 /* ASSURED bit can only be set */
876 /* Be careful here, modifying NAT bits can screw up things,
877 * so don't let users modify them directly if they don't pass
879 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
884 ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[])
886 #ifdef CONFIG_NF_NAT_NEEDED
889 if (cda[CTA_NAT_DST]) {
890 ret = ctnetlink_parse_nat_setup(ct,
896 if (cda[CTA_NAT_SRC]) {
897 ret = ctnetlink_parse_nat_setup(ct,
910 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
912 struct nf_conntrack_helper *helper;
913 struct nf_conn_help *help = nfct_help(ct);
917 /* don't change helper of sibling connections */
921 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
925 if (!strcmp(helpname, "")) {
926 if (help && help->helper) {
927 /* we had a helper before ... */
928 nf_ct_remove_expectations(ct);
929 rcu_assign_pointer(help->helper, NULL);
935 helper = __nf_conntrack_helper_find_byname(helpname);
936 if (helper == NULL) {
937 #ifdef CONFIG_MODULES
938 spin_unlock_bh(&nf_conntrack_lock);
940 if (request_module("nfct-helper-%s", helpname) < 0) {
941 spin_lock_bh(&nf_conntrack_lock);
945 spin_lock_bh(&nf_conntrack_lock);
946 helper = __nf_conntrack_helper_find_byname(helpname);
954 if (help->helper == helper)
958 /* need to zero data of old helper */
959 memset(&help->help, 0, sizeof(help->help));
961 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
966 rcu_assign_pointer(help->helper, helper);
972 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
974 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
976 if (!del_timer(&ct->timeout))
979 ct->timeout.expires = jiffies + timeout * HZ;
980 add_timer(&ct->timeout);
986 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
988 struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
989 struct nf_conntrack_l4proto *l4proto;
992 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
995 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
996 if (l4proto->from_nlattr)
997 err = l4proto->from_nlattr(tb, ct);
1003 #ifdef CONFIG_NF_NAT_NEEDED
1005 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1007 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1009 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1011 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1014 natseq->correction_pos =
1015 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1017 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1020 natseq->offset_before =
1021 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1023 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1026 natseq->offset_after =
1027 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1033 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1036 struct nf_conn_nat *nat = nfct_nat(ct);
1041 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1042 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1043 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1047 ct->status |= IPS_SEQ_ADJUST;
1050 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1051 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1052 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1056 ct->status |= IPS_SEQ_ADJUST;
1064 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1068 /* only allow NAT changes and master assignation for new conntracks */
1069 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1072 if (cda[CTA_HELP]) {
1073 err = ctnetlink_change_helper(ct, cda);
1078 if (cda[CTA_TIMEOUT]) {
1079 err = ctnetlink_change_timeout(ct, cda);
1084 if (cda[CTA_STATUS]) {
1085 err = ctnetlink_change_status(ct, cda);
1090 if (cda[CTA_PROTOINFO]) {
1091 err = ctnetlink_change_protoinfo(ct, cda);
1096 #if defined(CONFIG_NF_CONNTRACK_MARK)
1098 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1101 #ifdef CONFIG_NF_NAT_NEEDED
1102 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1103 err = ctnetlink_change_nat_seq_adj(ct, cda);
1113 ctnetlink_event_report(struct nf_conn *ct, u32 pid, int report)
1115 unsigned int events = 0;
1117 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1118 events |= IPCT_RELATED;
1122 nf_conntrack_event_report(IPCT_STATUS |
1134 static struct nf_conn *
1135 ctnetlink_create_conntrack(struct nlattr *cda[],
1136 struct nf_conntrack_tuple *otuple,
1137 struct nf_conntrack_tuple *rtuple,
1142 struct nf_conntrack_helper *helper;
1144 ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_ATOMIC);
1146 return ERR_PTR(-ENOMEM);
1148 if (!cda[CTA_TIMEOUT])
1150 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1152 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1153 ct->status |= IPS_CONFIRMED;
1156 if (cda[CTA_HELP]) {
1159 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1163 helper = __nf_conntrack_helper_find_byname(helpname);
1164 if (helper == NULL) {
1166 #ifdef CONFIG_MODULES
1167 if (request_module("nfct-helper-%s", helpname) < 0) {
1173 helper = __nf_conntrack_helper_find_byname(helpname);
1183 struct nf_conn_help *help;
1185 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1191 /* not in hash table yet so not strictly necessary */
1192 rcu_assign_pointer(help->helper, helper);
1195 /* try an implicit helper assignation */
1196 err = __nf_ct_try_assign_helper(ct, GFP_ATOMIC);
1201 if (cda[CTA_STATUS]) {
1202 err = ctnetlink_change_status(ct, cda);
1207 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1208 err = ctnetlink_change_nat(ct, cda);
1213 #ifdef CONFIG_NF_NAT_NEEDED
1214 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1215 err = ctnetlink_change_nat_seq_adj(ct, cda);
1221 if (cda[CTA_PROTOINFO]) {
1222 err = ctnetlink_change_protoinfo(ct, cda);
1227 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1229 #if defined(CONFIG_NF_CONNTRACK_MARK)
1231 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1234 /* setup master conntrack: this is a confirmed expectation */
1235 if (cda[CTA_TUPLE_MASTER]) {
1236 struct nf_conntrack_tuple master;
1237 struct nf_conntrack_tuple_hash *master_h;
1238 struct nf_conn *master_ct;
1240 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1244 master_h = __nf_conntrack_find(&init_net, &master);
1245 if (master_h == NULL) {
1249 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1250 nf_conntrack_get(&master_ct->ct_general);
1251 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1252 ct->master = master_ct;
1255 add_timer(&ct->timeout);
1256 nf_conntrack_hash_insert(ct);
1264 nf_conntrack_free(ct);
1265 return ERR_PTR(err);
1269 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1270 struct nlmsghdr *nlh, struct nlattr *cda[])
1272 struct nf_conntrack_tuple otuple, rtuple;
1273 struct nf_conntrack_tuple_hash *h = NULL;
1274 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1275 u_int8_t u3 = nfmsg->nfgen_family;
1278 if (cda[CTA_TUPLE_ORIG]) {
1279 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1284 if (cda[CTA_TUPLE_REPLY]) {
1285 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1290 spin_lock_bh(&nf_conntrack_lock);
1291 if (cda[CTA_TUPLE_ORIG])
1292 h = __nf_conntrack_find(&init_net, &otuple);
1293 else if (cda[CTA_TUPLE_REPLY])
1294 h = __nf_conntrack_find(&init_net, &rtuple);
1298 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1301 ct = ctnetlink_create_conntrack(cda, &otuple,
1308 nf_conntrack_get(&ct->ct_general);
1309 spin_unlock_bh(&nf_conntrack_lock);
1310 ctnetlink_event_report(ct,
1311 NETLINK_CB(skb).pid,
1315 spin_unlock_bh(&nf_conntrack_lock);
1319 /* implicit 'else' */
1321 /* We manipulate the conntrack inside the global conntrack table lock,
1322 * so there's no need to increase the refcount */
1324 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1325 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1327 err = ctnetlink_change_conntrack(ct, cda);
1329 nf_conntrack_get(&ct->ct_general);
1330 spin_unlock_bh(&nf_conntrack_lock);
1331 ctnetlink_event_report(ct,
1332 NETLINK_CB(skb).pid,
1336 spin_unlock_bh(&nf_conntrack_lock);
1342 spin_unlock_bh(&nf_conntrack_lock);
1346 /***********************************************************************
1348 ***********************************************************************/
1351 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1352 const struct nf_conntrack_tuple *tuple,
1353 enum ctattr_expect type)
1355 struct nlattr *nest_parms;
1357 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1359 goto nla_put_failure;
1360 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1361 goto nla_put_failure;
1362 nla_nest_end(skb, nest_parms);
1371 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1372 const struct nf_conntrack_tuple *tuple,
1373 const struct nf_conntrack_tuple_mask *mask)
1376 struct nf_conntrack_l3proto *l3proto;
1377 struct nf_conntrack_l4proto *l4proto;
1378 struct nf_conntrack_tuple m;
1379 struct nlattr *nest_parms;
1381 memset(&m, 0xFF, sizeof(m));
1382 m.src.u.all = mask->src.u.all;
1383 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1385 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1387 goto nla_put_failure;
1389 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1390 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1392 if (unlikely(ret < 0))
1393 goto nla_put_failure;
1395 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1396 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1397 if (unlikely(ret < 0))
1398 goto nla_put_failure;
1400 nla_nest_end(skb, nest_parms);
1409 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1410 const struct nf_conntrack_expect *exp)
1412 struct nf_conn *master = exp->master;
1413 long timeout = (exp->timeout.expires - jiffies) / HZ;
1418 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1419 goto nla_put_failure;
1420 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1421 goto nla_put_failure;
1422 if (ctnetlink_exp_dump_tuple(skb,
1423 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1424 CTA_EXPECT_MASTER) < 0)
1425 goto nla_put_failure;
1427 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1428 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1437 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1440 const struct nf_conntrack_expect *exp)
1442 struct nlmsghdr *nlh;
1443 struct nfgenmsg *nfmsg;
1444 unsigned char *b = skb_tail_pointer(skb);
1446 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1447 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1448 nfmsg = NLMSG_DATA(nlh);
1450 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1451 nfmsg->nfgen_family = exp->tuple.src.l3num;
1452 nfmsg->version = NFNETLINK_V0;
1455 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1456 goto nla_put_failure;
1458 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1467 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1468 static int ctnetlink_expect_event(struct notifier_block *this,
1469 unsigned long events, void *ptr)
1471 struct nlmsghdr *nlh;
1472 struct nfgenmsg *nfmsg;
1473 struct nf_exp_event *item = (struct nf_exp_event *)ptr;
1474 struct nf_conntrack_expect *exp = item->exp;
1475 struct sk_buff *skb;
1480 if (events & IPEXP_NEW) {
1481 type = IPCTNL_MSG_EXP_NEW;
1482 flags = NLM_F_CREATE|NLM_F_EXCL;
1486 if (!item->report &&
1487 !nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1490 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1496 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1497 nlh = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
1498 nfmsg = NLMSG_DATA(nlh);
1500 nlh->nlmsg_flags = flags;
1501 nfmsg->nfgen_family = exp->tuple.src.l3num;
1502 nfmsg->version = NFNETLINK_V0;
1506 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1507 goto nla_put_failure;
1510 nlh->nlmsg_len = skb->tail - b;
1511 nfnetlink_send(skb, item->pid, NFNLGRP_CONNTRACK_EXP_NEW, item->report);
1521 static int ctnetlink_exp_done(struct netlink_callback *cb)
1524 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1529 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1531 struct net *net = &init_net;
1532 struct nf_conntrack_expect *exp, *last;
1533 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1534 struct hlist_node *n;
1535 u_int8_t l3proto = nfmsg->nfgen_family;
1538 last = (struct nf_conntrack_expect *)cb->args[1];
1539 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1541 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1543 if (l3proto && exp->tuple.src.l3num != l3proto)
1550 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1554 if (!atomic_inc_not_zero(&exp->use))
1556 cb->args[1] = (unsigned long)exp;
1568 nf_ct_expect_put(last);
1573 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1574 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1575 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1579 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1580 struct nlmsghdr *nlh, struct nlattr *cda[])
1582 struct nf_conntrack_tuple tuple;
1583 struct nf_conntrack_expect *exp;
1584 struct sk_buff *skb2;
1585 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1586 u_int8_t u3 = nfmsg->nfgen_family;
1589 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1590 return netlink_dump_start(ctnl, skb, nlh,
1591 ctnetlink_exp_dump_table,
1592 ctnetlink_exp_done);
1595 if (cda[CTA_EXPECT_MASTER])
1596 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1603 exp = nf_ct_expect_find_get(&init_net, &tuple);
1607 if (cda[CTA_EXPECT_ID]) {
1608 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1609 if (ntohl(id) != (u32)(unsigned long)exp) {
1610 nf_ct_expect_put(exp);
1616 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1621 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1622 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1628 nf_ct_expect_put(exp);
1630 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1635 nf_ct_expect_put(exp);
1640 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1641 struct nlmsghdr *nlh, struct nlattr *cda[])
1643 struct nf_conntrack_expect *exp;
1644 struct nf_conntrack_tuple tuple;
1645 struct nf_conntrack_helper *h;
1646 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1647 struct hlist_node *n, *next;
1648 u_int8_t u3 = nfmsg->nfgen_family;
1652 if (cda[CTA_EXPECT_TUPLE]) {
1653 /* delete a single expect by tuple */
1654 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1658 /* bump usage count to 2 */
1659 exp = nf_ct_expect_find_get(&init_net, &tuple);
1663 if (cda[CTA_EXPECT_ID]) {
1664 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1665 if (ntohl(id) != (u32)(unsigned long)exp) {
1666 nf_ct_expect_put(exp);
1671 /* after list removal, usage count == 1 */
1672 nf_ct_unexpect_related(exp);
1673 /* have to put what we 'get' above.
1674 * after this line usage count == 0 */
1675 nf_ct_expect_put(exp);
1676 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1677 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1678 struct nf_conn_help *m_help;
1680 /* delete all expectations for this helper */
1681 spin_lock_bh(&nf_conntrack_lock);
1682 h = __nf_conntrack_helper_find_byname(name);
1684 spin_unlock_bh(&nf_conntrack_lock);
1687 for (i = 0; i < nf_ct_expect_hsize; i++) {
1688 hlist_for_each_entry_safe(exp, n, next,
1689 &init_net.ct.expect_hash[i],
1691 m_help = nfct_help(exp->master);
1692 if (m_help->helper == h
1693 && del_timer(&exp->timeout)) {
1694 nf_ct_unlink_expect(exp);
1695 nf_ct_expect_put(exp);
1699 spin_unlock_bh(&nf_conntrack_lock);
1701 /* This basically means we have to flush everything*/
1702 spin_lock_bh(&nf_conntrack_lock);
1703 for (i = 0; i < nf_ct_expect_hsize; i++) {
1704 hlist_for_each_entry_safe(exp, n, next,
1705 &init_net.ct.expect_hash[i],
1707 if (del_timer(&exp->timeout)) {
1708 nf_ct_unlink_expect(exp);
1709 nf_ct_expect_put(exp);
1713 spin_unlock_bh(&nf_conntrack_lock);
1719 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1725 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3, u32 pid, int report)
1727 struct nf_conntrack_tuple tuple, mask, master_tuple;
1728 struct nf_conntrack_tuple_hash *h = NULL;
1729 struct nf_conntrack_expect *exp;
1731 struct nf_conn_help *help;
1734 /* caller guarantees that those three CTA_EXPECT_* exist */
1735 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1738 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1741 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1745 /* Look for master conntrack of this expectation */
1746 h = nf_conntrack_find_get(&init_net, &master_tuple);
1749 ct = nf_ct_tuplehash_to_ctrack(h);
1750 help = nfct_help(ct);
1752 if (!help || !help->helper) {
1753 /* such conntrack hasn't got any helper, abort */
1758 exp = nf_ct_expect_alloc(ct);
1764 exp->expectfn = NULL;
1768 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1769 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1770 exp->mask.src.u.all = mask.src.u.all;
1772 err = nf_ct_expect_related_report(exp, pid, report);
1773 nf_ct_expect_put(exp);
1776 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1781 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1782 struct nlmsghdr *nlh, struct nlattr *cda[])
1784 struct nf_conntrack_tuple tuple;
1785 struct nf_conntrack_expect *exp;
1786 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1787 u_int8_t u3 = nfmsg->nfgen_family;
1790 if (!cda[CTA_EXPECT_TUPLE]
1791 || !cda[CTA_EXPECT_MASK]
1792 || !cda[CTA_EXPECT_MASTER])
1795 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1799 spin_lock_bh(&nf_conntrack_lock);
1800 exp = __nf_ct_expect_find(&init_net, &tuple);
1803 spin_unlock_bh(&nf_conntrack_lock);
1805 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1806 err = ctnetlink_create_expect(cda,
1808 NETLINK_CB(skb).pid,
1815 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1816 err = ctnetlink_change_expect(exp, cda);
1817 spin_unlock_bh(&nf_conntrack_lock);
1822 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1823 static struct notifier_block ctnl_notifier = {
1824 .notifier_call = ctnetlink_conntrack_event,
1827 static struct notifier_block ctnl_notifier_exp = {
1828 .notifier_call = ctnetlink_expect_event,
1832 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1833 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1834 .attr_count = CTA_MAX,
1835 .policy = ct_nla_policy },
1836 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1837 .attr_count = CTA_MAX,
1838 .policy = ct_nla_policy },
1839 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1840 .attr_count = CTA_MAX,
1841 .policy = ct_nla_policy },
1842 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1843 .attr_count = CTA_MAX,
1844 .policy = ct_nla_policy },
1847 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1848 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1849 .attr_count = CTA_EXPECT_MAX,
1850 .policy = exp_nla_policy },
1851 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1852 .attr_count = CTA_EXPECT_MAX,
1853 .policy = exp_nla_policy },
1854 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1855 .attr_count = CTA_EXPECT_MAX,
1856 .policy = exp_nla_policy },
1859 static const struct nfnetlink_subsystem ctnl_subsys = {
1860 .name = "conntrack",
1861 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1862 .cb_count = IPCTNL_MSG_MAX,
1866 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1867 .name = "conntrack_expect",
1868 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1869 .cb_count = IPCTNL_MSG_EXP_MAX,
1873 MODULE_ALIAS("ip_conntrack_netlink");
1874 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1875 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1877 static int __init ctnetlink_init(void)
1881 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1882 ret = nfnetlink_subsys_register(&ctnl_subsys);
1884 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1888 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1890 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1891 goto err_unreg_subsys;
1894 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1895 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1897 printk("ctnetlink_init: cannot register notifier.\n");
1898 goto err_unreg_exp_subsys;
1901 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1903 printk("ctnetlink_init: cannot expect register notifier.\n");
1904 goto err_unreg_notifier;
1910 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1912 nf_conntrack_unregister_notifier(&ctnl_notifier);
1913 err_unreg_exp_subsys:
1914 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1917 nfnetlink_subsys_unregister(&ctnl_subsys);
1922 static void __exit ctnetlink_exit(void)
1924 printk("ctnetlink: unregistering from nfnetlink.\n");
1926 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1927 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1928 nf_conntrack_unregister_notifier(&ctnl_notifier);
1931 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1932 nfnetlink_subsys_unregister(&ctnl_subsys);
1936 module_init(ctnetlink_init);
1937 module_exit(ctnetlink_exit);