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) 2005-2007 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/types.h>
22 #include <linux/timer.h>
23 #include <linux/skbuff.h>
24 #include <linux/errno.h>
25 #include <linux/netlink.h>
26 #include <linux/spinlock.h>
27 #include <linux/interrupt.h>
28 #include <linux/notifier.h>
30 #include <linux/netfilter.h>
31 #include <net/netlink.h>
32 #include <net/netfilter/nf_conntrack.h>
33 #include <net/netfilter/nf_conntrack_core.h>
34 #include <net/netfilter/nf_conntrack_expect.h>
35 #include <net/netfilter/nf_conntrack_helper.h>
36 #include <net/netfilter/nf_conntrack_l3proto.h>
37 #include <net/netfilter/nf_conntrack_l4proto.h>
38 #include <net/netfilter/nf_conntrack_tuple.h>
39 #ifdef CONFIG_NF_NAT_NEEDED
40 #include <net/netfilter/nf_nat_core.h>
41 #include <net/netfilter/nf_nat_protocol.h>
44 #include <linux/netfilter/nfnetlink.h>
45 #include <linux/netfilter/nfnetlink_conntrack.h>
47 MODULE_LICENSE("GPL");
49 static char __initdata version[] = "0.93";
52 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
53 const struct nf_conntrack_tuple *tuple,
54 struct nf_conntrack_l4proto *l4proto)
57 struct nlattr *nest_parms;
59 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
62 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
64 if (likely(l4proto->tuple_to_nlattr))
65 ret = l4proto->tuple_to_nlattr(skb, tuple);
67 nla_nest_end(skb, nest_parms);
76 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
77 const struct nf_conntrack_tuple *tuple,
78 struct nf_conntrack_l3proto *l3proto)
81 struct nlattr *nest_parms;
83 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
87 if (likely(l3proto->tuple_to_nlattr))
88 ret = l3proto->tuple_to_nlattr(skb, tuple);
90 nla_nest_end(skb, nest_parms);
99 ctnetlink_dump_tuples(struct sk_buff *skb,
100 const struct nf_conntrack_tuple *tuple)
103 struct nf_conntrack_l3proto *l3proto;
104 struct nf_conntrack_l4proto *l4proto;
106 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
107 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
108 nf_ct_l3proto_put(l3proto);
110 if (unlikely(ret < 0))
113 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
114 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
115 nf_ct_l4proto_put(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 = nf_ct_l4proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
149 struct nlattr *nest_proto;
152 if (!l4proto->to_nlattr) {
153 nf_ct_l4proto_put(l4proto);
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 nf_ct_l4proto_put(l4proto);
165 nla_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 nlattr *nest_helper;
178 const struct nf_conn_help *help = nfct_help(ct);
179 struct nf_conntrack_helper *helper;
185 helper = rcu_dereference(help->helper);
189 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
191 goto nla_put_failure;
192 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
194 if (helper->to_nlattr)
195 helper->to_nlattr(skb, ct);
197 nla_nest_end(skb, nest_helper);
207 #ifdef CONFIG_NF_CT_ACCT
209 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
210 enum ip_conntrack_dir dir)
212 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
213 struct nlattr *nest_count;
215 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
217 goto nla_put_failure;
219 NLA_PUT_BE32(skb, CTA_COUNTERS32_PACKETS,
220 htonl(ct->counters[dir].packets));
221 NLA_PUT_BE32(skb, CTA_COUNTERS32_BYTES,
222 htonl(ct->counters[dir].bytes));
224 nla_nest_end(skb, nest_count);
232 #define ctnetlink_dump_counters(a, b, c) (0)
235 #ifdef CONFIG_NF_CONNTRACK_MARK
237 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
239 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
246 #define ctnetlink_dump_mark(a, b) (0)
249 #ifdef CONFIG_NF_CONNTRACK_SECMARK
251 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
253 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
260 #define ctnetlink_dump_secmark(a, b) (0)
263 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
266 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
268 struct nlattr *nest_parms;
270 if (!(ct->status & IPS_EXPECTED))
273 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
275 goto nla_put_failure;
276 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
277 goto nla_put_failure;
278 nla_nest_end(skb, nest_parms);
286 #ifdef CONFIG_NF_NAT_NEEDED
288 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
290 struct nlattr *nest_parms;
292 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
294 goto nla_put_failure;
296 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
297 htonl(natseq->correction_pos));
298 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
299 htonl(natseq->offset_before));
300 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
301 htonl(natseq->offset_after));
303 nla_nest_end(skb, nest_parms);
312 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
314 struct nf_nat_seq *natseq;
315 struct nf_conn_nat *nat = nfct_nat(ct);
317 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
320 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
321 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
324 natseq = &nat->seq[IP_CT_DIR_REPLY];
325 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
331 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
335 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
337 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
345 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
347 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
354 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
357 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
358 int event, int nowait,
359 const struct nf_conn *ct)
361 struct nlmsghdr *nlh;
362 struct nfgenmsg *nfmsg;
363 struct nlattr *nest_parms;
364 unsigned char *b = skb_tail_pointer(skb);
366 event |= NFNL_SUBSYS_CTNETLINK << 8;
367 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
368 nfmsg = NLMSG_DATA(nlh);
370 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
371 nfmsg->nfgen_family =
372 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
373 nfmsg->version = NFNETLINK_V0;
376 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
378 goto nla_put_failure;
379 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
380 goto nla_put_failure;
381 nla_nest_end(skb, nest_parms);
383 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
385 goto nla_put_failure;
386 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
387 goto nla_put_failure;
388 nla_nest_end(skb, nest_parms);
390 if (ctnetlink_dump_status(skb, ct) < 0 ||
391 ctnetlink_dump_timeout(skb, ct) < 0 ||
392 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
393 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
394 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
395 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
396 ctnetlink_dump_mark(skb, ct) < 0 ||
397 ctnetlink_dump_secmark(skb, ct) < 0 ||
398 ctnetlink_dump_id(skb, ct) < 0 ||
399 ctnetlink_dump_use(skb, ct) < 0 ||
400 ctnetlink_dump_master(skb, ct) < 0 ||
401 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
402 goto nla_put_failure;
404 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
413 #ifdef CONFIG_NF_CONNTRACK_EVENTS
414 static int ctnetlink_conntrack_event(struct notifier_block *this,
415 unsigned long events, void *ptr)
417 struct nlmsghdr *nlh;
418 struct nfgenmsg *nfmsg;
419 struct nlattr *nest_parms;
420 struct nf_conn *ct = (struct nf_conn *)ptr;
424 unsigned int flags = 0, group;
426 /* ignore our fake conntrack entry */
427 if (ct == &nf_conntrack_untracked)
430 if (events & IPCT_DESTROY) {
431 type = IPCTNL_MSG_CT_DELETE;
432 group = NFNLGRP_CONNTRACK_DESTROY;
433 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
434 type = IPCTNL_MSG_CT_NEW;
435 flags = NLM_F_CREATE|NLM_F_EXCL;
436 group = NFNLGRP_CONNTRACK_NEW;
437 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
438 type = IPCTNL_MSG_CT_NEW;
439 group = NFNLGRP_CONNTRACK_UPDATE;
443 if (!nfnetlink_has_listeners(group))
446 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
452 type |= NFNL_SUBSYS_CTNETLINK << 8;
453 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
454 nfmsg = NLMSG_DATA(nlh);
456 nlh->nlmsg_flags = flags;
457 nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
458 nfmsg->version = NFNETLINK_V0;
461 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
463 goto nla_put_failure;
464 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
465 goto nla_put_failure;
466 nla_nest_end(skb, nest_parms);
468 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
470 goto nla_put_failure;
471 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
472 goto nla_put_failure;
473 nla_nest_end(skb, nest_parms);
475 if (events & IPCT_DESTROY) {
476 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
477 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
478 goto nla_put_failure;
480 if (ctnetlink_dump_status(skb, ct) < 0)
481 goto nla_put_failure;
483 if (ctnetlink_dump_timeout(skb, ct) < 0)
484 goto nla_put_failure;
486 if (events & IPCT_PROTOINFO
487 && ctnetlink_dump_protoinfo(skb, ct) < 0)
488 goto nla_put_failure;
490 if ((events & IPCT_HELPER || nfct_help(ct))
491 && ctnetlink_dump_helpinfo(skb, ct) < 0)
492 goto nla_put_failure;
494 #ifdef CONFIG_NF_CONNTRACK_MARK
495 if ((events & IPCT_MARK || ct->mark)
496 && ctnetlink_dump_mark(skb, ct) < 0)
497 goto nla_put_failure;
499 #ifdef CONFIG_NF_CONNTRACK_SECMARK
500 if ((events & IPCT_SECMARK || ct->secmark)
501 && ctnetlink_dump_secmark(skb, ct) < 0)
502 goto nla_put_failure;
505 if (events & IPCT_COUNTER_FILLING &&
506 (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
507 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
508 goto nla_put_failure;
510 if (events & IPCT_RELATED &&
511 ctnetlink_dump_master(skb, ct) < 0)
512 goto nla_put_failure;
514 if (events & IPCT_NATSEQADJ &&
515 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
516 goto nla_put_failure;
519 nlh->nlmsg_len = skb->tail - b;
520 nfnetlink_send(skb, 0, group, 0);
528 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
530 static int ctnetlink_done(struct netlink_callback *cb)
533 nf_ct_put((struct nf_conn *)cb->args[1]);
537 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
540 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
542 struct nf_conn *ct, *last;
543 struct nf_conntrack_tuple_hash *h;
544 struct hlist_node *n;
545 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
546 u_int8_t l3proto = nfmsg->nfgen_family;
548 read_lock_bh(&nf_conntrack_lock);
549 last = (struct nf_conn *)cb->args[1];
550 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
552 hlist_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
554 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
556 ct = nf_ct_tuplehash_to_ctrack(h);
557 /* Dump entries of a given L3 protocol number.
558 * If it is not specified, ie. l3proto == 0,
559 * then dump everything. */
560 if (l3proto && L3PROTO(ct) != l3proto)
567 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
571 nf_conntrack_get(&ct->ct_general);
572 cb->args[1] = (unsigned long)ct;
575 #ifdef CONFIG_NF_CT_ACCT
576 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
577 IPCTNL_MSG_CT_GET_CTRZERO)
578 memset(&ct->counters, 0, sizeof(ct->counters));
587 read_unlock_bh(&nf_conntrack_lock);
595 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
597 struct nlattr *tb[CTA_IP_MAX+1];
598 struct nf_conntrack_l3proto *l3proto;
601 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
603 l3proto = nf_ct_l3proto_find_get(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);
612 nf_ct_l3proto_put(l3proto);
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]);
637 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
639 if (likely(l4proto->nlattr_to_tuple)) {
640 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
641 l4proto->nla_policy);
643 ret = l4proto->nlattr_to_tuple(tb, tuple);
646 nf_ct_l4proto_put(l4proto);
652 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
653 enum ctattr_tuple type, u_int8_t l3num)
655 struct nlattr *tb[CTA_TUPLE_MAX+1];
658 memset(tuple, 0, sizeof(*tuple));
660 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
662 if (!tb[CTA_TUPLE_IP])
665 tuple->src.l3num = l3num;
667 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
671 if (!tb[CTA_TUPLE_PROTO])
674 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
678 /* orig and expect tuples get DIR_ORIGINAL */
679 if (type == CTA_TUPLE_REPLY)
680 tuple->dst.dir = IP_CT_DIR_REPLY;
682 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
687 #ifdef CONFIG_NF_NAT_NEEDED
688 static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
689 [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 },
690 [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 },
693 static int nfnetlink_parse_nat_proto(struct nlattr *attr,
694 const struct nf_conn *ct,
695 struct nf_nat_range *range)
697 struct nlattr *tb[CTA_PROTONAT_MAX+1];
698 struct nf_nat_protocol *npt;
701 err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
705 npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
707 if (!npt->nlattr_to_range) {
708 nf_nat_proto_put(npt);
712 /* nlattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
713 if (npt->nlattr_to_range(tb, range) > 0)
714 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
716 nf_nat_proto_put(npt);
721 static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
722 [CTA_NAT_MINIP] = { .type = NLA_U32 },
723 [CTA_NAT_MAXIP] = { .type = NLA_U32 },
727 nfnetlink_parse_nat(struct nlattr *nat,
728 const struct nf_conn *ct, struct nf_nat_range *range)
730 struct nlattr *tb[CTA_NAT_MAX+1];
733 memset(range, 0, sizeof(*range));
735 err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
739 if (tb[CTA_NAT_MINIP])
740 range->min_ip = nla_get_be32(tb[CTA_NAT_MINIP]);
742 if (!tb[CTA_NAT_MAXIP])
743 range->max_ip = range->min_ip;
745 range->max_ip = nla_get_be32(tb[CTA_NAT_MAXIP]);
748 range->flags |= IP_NAT_RANGE_MAP_IPS;
750 if (!tb[CTA_NAT_PROTO])
753 err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
762 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
764 struct nlattr *tb[CTA_HELP_MAX+1];
766 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
768 if (!tb[CTA_HELP_NAME])
771 *helper_name = nla_data(tb[CTA_HELP_NAME]);
776 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
777 [CTA_STATUS] = { .type = NLA_U32 },
778 [CTA_TIMEOUT] = { .type = NLA_U32 },
779 [CTA_MARK] = { .type = NLA_U32 },
780 [CTA_USE] = { .type = NLA_U32 },
781 [CTA_ID] = { .type = NLA_U32 },
785 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
786 struct nlmsghdr *nlh, struct nlattr *cda[])
788 struct nf_conntrack_tuple_hash *h;
789 struct nf_conntrack_tuple tuple;
791 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
792 u_int8_t u3 = nfmsg->nfgen_family;
795 if (cda[CTA_TUPLE_ORIG])
796 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
797 else if (cda[CTA_TUPLE_REPLY])
798 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
800 /* Flush the whole table */
801 nf_conntrack_flush();
808 h = nf_conntrack_find_get(&tuple);
812 ct = nf_ct_tuplehash_to_ctrack(h);
815 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
816 if (id != (u32)(unsigned long)ct) {
821 if (del_timer(&ct->timeout))
822 ct->timeout.function((unsigned long)ct);
830 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
831 struct nlmsghdr *nlh, struct nlattr *cda[])
833 struct nf_conntrack_tuple_hash *h;
834 struct nf_conntrack_tuple tuple;
836 struct sk_buff *skb2 = NULL;
837 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
838 u_int8_t u3 = nfmsg->nfgen_family;
841 if (nlh->nlmsg_flags & NLM_F_DUMP) {
842 #ifndef CONFIG_NF_CT_ACCT
843 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
846 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
850 if (cda[CTA_TUPLE_ORIG])
851 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
852 else if (cda[CTA_TUPLE_REPLY])
853 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
860 h = nf_conntrack_find_get(&tuple);
864 ct = nf_ct_tuplehash_to_ctrack(h);
867 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
873 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
874 IPCTNL_MSG_CT_NEW, 1, ct);
879 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
892 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
895 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
896 d = ct->status ^ status;
898 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
902 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
903 /* SEEN_REPLY bit can only be set */
907 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
908 /* ASSURED bit can only be set */
911 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
912 #ifndef CONFIG_NF_NAT_NEEDED
915 struct nf_nat_range range;
917 if (cda[CTA_NAT_DST]) {
918 if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
921 if (nf_nat_initialized(ct,
922 HOOK2MANIP(NF_INET_PRE_ROUTING)))
924 nf_nat_setup_info(ct, &range, NF_INET_PRE_ROUTING);
926 if (cda[CTA_NAT_SRC]) {
927 if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
930 if (nf_nat_initialized(ct,
931 HOOK2MANIP(NF_INET_POST_ROUTING)))
933 nf_nat_setup_info(ct, &range, NF_INET_POST_ROUTING);
938 /* Be careful here, modifying NAT bits can screw up things,
939 * so don't let users modify them directly if they don't pass
941 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
947 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
949 struct nf_conntrack_helper *helper;
950 struct nf_conn_help *help = nfct_help(ct);
954 /* don't change helper of sibling connections */
958 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
962 if (!strcmp(helpname, "")) {
963 if (help && help->helper) {
964 /* we had a helper before ... */
965 nf_ct_remove_expectations(ct);
966 rcu_assign_pointer(help->helper, NULL);
972 helper = __nf_conntrack_helper_find_byname(helpname);
977 if (help->helper == helper)
981 /* need to zero data of old helper */
982 memset(&help->help, 0, sizeof(help->help));
984 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
989 rcu_assign_pointer(help->helper, helper);
995 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
997 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
999 if (!del_timer(&ct->timeout))
1002 ct->timeout.expires = jiffies + timeout * HZ;
1003 add_timer(&ct->timeout);
1009 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1011 struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1012 struct nf_conntrack_l4proto *l4proto;
1013 u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
1014 u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
1017 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1019 l4proto = nf_ct_l4proto_find_get(l3num, npt);
1021 if (l4proto->from_nlattr)
1022 err = l4proto->from_nlattr(tb, ct);
1023 nf_ct_l4proto_put(l4proto);
1028 #ifdef CONFIG_NF_NAT_NEEDED
1030 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1032 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1034 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1036 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1039 natseq->correction_pos =
1040 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1042 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1045 natseq->offset_before =
1046 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1048 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1051 natseq->offset_after =
1052 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1058 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1061 struct nf_conn_nat *nat = nfct_nat(ct);
1066 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1067 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1068 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1072 ct->status |= IPS_SEQ_ADJUST;
1075 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1076 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1077 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1081 ct->status |= IPS_SEQ_ADJUST;
1089 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1093 if (cda[CTA_HELP]) {
1094 err = ctnetlink_change_helper(ct, cda);
1099 if (cda[CTA_TIMEOUT]) {
1100 err = ctnetlink_change_timeout(ct, cda);
1105 if (cda[CTA_STATUS]) {
1106 err = ctnetlink_change_status(ct, cda);
1111 if (cda[CTA_PROTOINFO]) {
1112 err = ctnetlink_change_protoinfo(ct, cda);
1117 #if defined(CONFIG_NF_CONNTRACK_MARK)
1119 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1122 #ifdef CONFIG_NF_NAT_NEEDED
1123 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1124 err = ctnetlink_change_nat_seq_adj(ct, cda);
1134 ctnetlink_create_conntrack(struct nlattr *cda[],
1135 struct nf_conntrack_tuple *otuple,
1136 struct nf_conntrack_tuple *rtuple,
1137 struct nf_conn *master_ct)
1141 struct nf_conn_help *help;
1142 struct nf_conntrack_helper *helper;
1144 ct = nf_conntrack_alloc(otuple, rtuple);
1145 if (ct == NULL || IS_ERR(ct))
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;
1155 if (cda[CTA_STATUS]) {
1156 err = ctnetlink_change_status(ct, cda);
1161 if (cda[CTA_PROTOINFO]) {
1162 err = ctnetlink_change_protoinfo(ct, cda);
1167 #if defined(CONFIG_NF_CONNTRACK_MARK)
1169 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1172 helper = nf_ct_helper_find_get(rtuple);
1174 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
1176 nf_ct_helper_put(helper);
1180 /* not in hash table yet so not strictly necessary */
1181 rcu_assign_pointer(help->helper, helper);
1184 /* setup master conntrack: this is a confirmed expectation */
1186 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1187 ct->master = master_ct;
1190 add_timer(&ct->timeout);
1191 nf_conntrack_hash_insert(ct);
1194 nf_ct_helper_put(helper);
1199 nf_conntrack_free(ct);
1204 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1205 struct nlmsghdr *nlh, struct nlattr *cda[])
1207 struct nf_conntrack_tuple otuple, rtuple;
1208 struct nf_conntrack_tuple_hash *h = NULL;
1209 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1210 u_int8_t u3 = nfmsg->nfgen_family;
1213 if (cda[CTA_TUPLE_ORIG]) {
1214 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1219 if (cda[CTA_TUPLE_REPLY]) {
1220 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1225 write_lock_bh(&nf_conntrack_lock);
1226 if (cda[CTA_TUPLE_ORIG])
1227 h = __nf_conntrack_find(&otuple, NULL);
1228 else if (cda[CTA_TUPLE_REPLY])
1229 h = __nf_conntrack_find(&rtuple, NULL);
1232 struct nf_conntrack_tuple master;
1233 struct nf_conntrack_tuple_hash *master_h = NULL;
1234 struct nf_conn *master_ct = NULL;
1236 if (cda[CTA_TUPLE_MASTER]) {
1237 err = ctnetlink_parse_tuple(cda,
1244 master_h = __nf_conntrack_find(&master, NULL);
1245 if (master_h == NULL) {
1249 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1250 atomic_inc(&master_ct->ct_general.use);
1253 write_unlock_bh(&nf_conntrack_lock);
1255 if (nlh->nlmsg_flags & NLM_F_CREATE)
1256 err = ctnetlink_create_conntrack(cda,
1260 if (err < 0 && master_ct)
1261 nf_ct_put(master_ct);
1265 /* implicit 'else' */
1267 /* We manipulate the conntrack inside the global conntrack table lock,
1268 * so there's no need to increase the refcount */
1270 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1271 /* we only allow nat config for new conntracks */
1272 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1276 /* can't link an existing conntrack to a master */
1277 if (cda[CTA_TUPLE_MASTER]) {
1281 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1286 write_unlock_bh(&nf_conntrack_lock);
1290 /***********************************************************************
1292 ***********************************************************************/
1295 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1296 const struct nf_conntrack_tuple *tuple,
1297 enum ctattr_expect type)
1299 struct nlattr *nest_parms;
1301 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1303 goto nla_put_failure;
1304 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1305 goto nla_put_failure;
1306 nla_nest_end(skb, nest_parms);
1315 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1316 const struct nf_conntrack_tuple *tuple,
1317 const struct nf_conntrack_tuple_mask *mask)
1320 struct nf_conntrack_l3proto *l3proto;
1321 struct nf_conntrack_l4proto *l4proto;
1322 struct nf_conntrack_tuple m;
1323 struct nlattr *nest_parms;
1325 memset(&m, 0xFF, sizeof(m));
1326 m.src.u.all = mask->src.u.all;
1327 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1329 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1331 goto nla_put_failure;
1333 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1334 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1335 nf_ct_l3proto_put(l3proto);
1337 if (unlikely(ret < 0))
1338 goto nla_put_failure;
1340 l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1341 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1342 nf_ct_l4proto_put(l4proto);
1343 if (unlikely(ret < 0))
1344 goto nla_put_failure;
1346 nla_nest_end(skb, nest_parms);
1355 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1356 const struct nf_conntrack_expect *exp)
1358 struct nf_conn *master = exp->master;
1359 long timeout = (exp->timeout.expires - jiffies) / HZ;
1364 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1365 goto nla_put_failure;
1366 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1367 goto nla_put_failure;
1368 if (ctnetlink_exp_dump_tuple(skb,
1369 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1370 CTA_EXPECT_MASTER) < 0)
1371 goto nla_put_failure;
1373 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1374 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1383 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1386 const struct nf_conntrack_expect *exp)
1388 struct nlmsghdr *nlh;
1389 struct nfgenmsg *nfmsg;
1390 unsigned char *b = skb_tail_pointer(skb);
1392 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1393 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1394 nfmsg = NLMSG_DATA(nlh);
1396 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1397 nfmsg->nfgen_family = exp->tuple.src.l3num;
1398 nfmsg->version = NFNETLINK_V0;
1401 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1402 goto nla_put_failure;
1404 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1413 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1414 static int ctnetlink_expect_event(struct notifier_block *this,
1415 unsigned long events, void *ptr)
1417 struct nlmsghdr *nlh;
1418 struct nfgenmsg *nfmsg;
1419 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1420 struct sk_buff *skb;
1425 if (events & IPEXP_NEW) {
1426 type = IPCTNL_MSG_EXP_NEW;
1427 flags = NLM_F_CREATE|NLM_F_EXCL;
1431 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1434 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1440 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1441 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1442 nfmsg = NLMSG_DATA(nlh);
1444 nlh->nlmsg_flags = flags;
1445 nfmsg->nfgen_family = exp->tuple.src.l3num;
1446 nfmsg->version = NFNETLINK_V0;
1449 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1450 goto nla_put_failure;
1452 nlh->nlmsg_len = skb->tail - b;
1453 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1462 static int ctnetlink_exp_done(struct netlink_callback *cb)
1465 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1470 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1472 struct nf_conntrack_expect *exp, *last;
1473 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1474 struct hlist_node *n;
1475 u_int8_t l3proto = nfmsg->nfgen_family;
1477 read_lock_bh(&nf_conntrack_lock);
1478 last = (struct nf_conntrack_expect *)cb->args[1];
1479 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1481 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1483 if (l3proto && exp->tuple.src.l3num != l3proto)
1490 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1494 atomic_inc(&exp->use);
1495 cb->args[1] = (unsigned long)exp;
1505 read_unlock_bh(&nf_conntrack_lock);
1507 nf_ct_expect_put(last);
1512 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1513 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1514 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1518 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1519 struct nlmsghdr *nlh, struct nlattr *cda[])
1521 struct nf_conntrack_tuple tuple;
1522 struct nf_conntrack_expect *exp;
1523 struct sk_buff *skb2;
1524 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1525 u_int8_t u3 = nfmsg->nfgen_family;
1528 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1529 return netlink_dump_start(ctnl, skb, nlh,
1530 ctnetlink_exp_dump_table,
1531 ctnetlink_exp_done);
1534 if (cda[CTA_EXPECT_MASTER])
1535 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1542 exp = nf_ct_expect_find_get(&tuple);
1546 if (cda[CTA_EXPECT_ID]) {
1547 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1548 if (ntohl(id) != (u32)(unsigned long)exp) {
1549 nf_ct_expect_put(exp);
1555 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1559 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1560 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1565 nf_ct_expect_put(exp);
1567 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1572 nf_ct_expect_put(exp);
1577 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1578 struct nlmsghdr *nlh, struct nlattr *cda[])
1580 struct nf_conntrack_expect *exp;
1581 struct nf_conntrack_tuple tuple;
1582 struct nf_conntrack_helper *h;
1583 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1584 struct hlist_node *n, *next;
1585 u_int8_t u3 = nfmsg->nfgen_family;
1589 if (cda[CTA_EXPECT_TUPLE]) {
1590 /* delete a single expect by tuple */
1591 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1595 /* bump usage count to 2 */
1596 exp = nf_ct_expect_find_get(&tuple);
1600 if (cda[CTA_EXPECT_ID]) {
1601 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1602 if (ntohl(id) != (u32)(unsigned long)exp) {
1603 nf_ct_expect_put(exp);
1608 /* after list removal, usage count == 1 */
1609 nf_ct_unexpect_related(exp);
1610 /* have to put what we 'get' above.
1611 * after this line usage count == 0 */
1612 nf_ct_expect_put(exp);
1613 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1614 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1615 struct nf_conn_help *m_help;
1617 /* delete all expectations for this helper */
1618 write_lock_bh(&nf_conntrack_lock);
1619 h = __nf_conntrack_helper_find_byname(name);
1621 write_unlock_bh(&nf_conntrack_lock);
1624 for (i = 0; i < nf_ct_expect_hsize; i++) {
1625 hlist_for_each_entry_safe(exp, n, next,
1626 &nf_ct_expect_hash[i],
1628 m_help = nfct_help(exp->master);
1629 if (m_help->helper == h
1630 && del_timer(&exp->timeout)) {
1631 nf_ct_unlink_expect(exp);
1632 nf_ct_expect_put(exp);
1636 write_unlock_bh(&nf_conntrack_lock);
1638 /* This basically means we have to flush everything*/
1639 write_lock_bh(&nf_conntrack_lock);
1640 for (i = 0; i < nf_ct_expect_hsize; i++) {
1641 hlist_for_each_entry_safe(exp, n, next,
1642 &nf_ct_expect_hash[i],
1644 if (del_timer(&exp->timeout)) {
1645 nf_ct_unlink_expect(exp);
1646 nf_ct_expect_put(exp);
1650 write_unlock_bh(&nf_conntrack_lock);
1656 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1662 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1664 struct nf_conntrack_tuple tuple, mask, master_tuple;
1665 struct nf_conntrack_tuple_hash *h = NULL;
1666 struct nf_conntrack_expect *exp;
1668 struct nf_conn_help *help;
1671 /* caller guarantees that those three CTA_EXPECT_* exist */
1672 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1675 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1678 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1682 /* Look for master conntrack of this expectation */
1683 h = nf_conntrack_find_get(&master_tuple);
1686 ct = nf_ct_tuplehash_to_ctrack(h);
1687 help = nfct_help(ct);
1689 if (!help || !help->helper) {
1690 /* such conntrack hasn't got any helper, abort */
1695 exp = nf_ct_expect_alloc(ct);
1701 exp->expectfn = NULL;
1705 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1706 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1707 exp->mask.src.u.all = mask.src.u.all;
1709 err = nf_ct_expect_related(exp);
1710 nf_ct_expect_put(exp);
1713 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1718 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1719 struct nlmsghdr *nlh, struct nlattr *cda[])
1721 struct nf_conntrack_tuple tuple;
1722 struct nf_conntrack_expect *exp;
1723 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1724 u_int8_t u3 = nfmsg->nfgen_family;
1727 if (!cda[CTA_EXPECT_TUPLE]
1728 || !cda[CTA_EXPECT_MASK]
1729 || !cda[CTA_EXPECT_MASTER])
1732 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1736 write_lock_bh(&nf_conntrack_lock);
1737 exp = __nf_ct_expect_find(&tuple);
1740 write_unlock_bh(&nf_conntrack_lock);
1742 if (nlh->nlmsg_flags & NLM_F_CREATE)
1743 err = ctnetlink_create_expect(cda, u3);
1748 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1749 err = ctnetlink_change_expect(exp, cda);
1750 write_unlock_bh(&nf_conntrack_lock);
1755 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1756 static struct notifier_block ctnl_notifier = {
1757 .notifier_call = ctnetlink_conntrack_event,
1760 static struct notifier_block ctnl_notifier_exp = {
1761 .notifier_call = ctnetlink_expect_event,
1765 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1766 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1767 .attr_count = CTA_MAX,
1768 .policy = ct_nla_policy },
1769 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1770 .attr_count = CTA_MAX,
1771 .policy = ct_nla_policy },
1772 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1773 .attr_count = CTA_MAX,
1774 .policy = ct_nla_policy },
1775 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1776 .attr_count = CTA_MAX,
1777 .policy = ct_nla_policy },
1780 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1781 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1782 .attr_count = CTA_EXPECT_MAX,
1783 .policy = exp_nla_policy },
1784 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1785 .attr_count = CTA_EXPECT_MAX,
1786 .policy = exp_nla_policy },
1787 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1788 .attr_count = CTA_EXPECT_MAX,
1789 .policy = exp_nla_policy },
1792 static const struct nfnetlink_subsystem ctnl_subsys = {
1793 .name = "conntrack",
1794 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1795 .cb_count = IPCTNL_MSG_MAX,
1799 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1800 .name = "conntrack_expect",
1801 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1802 .cb_count = IPCTNL_MSG_EXP_MAX,
1806 MODULE_ALIAS("ip_conntrack_netlink");
1807 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1808 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1810 static int __init ctnetlink_init(void)
1814 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1815 ret = nfnetlink_subsys_register(&ctnl_subsys);
1817 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1821 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1823 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1824 goto err_unreg_subsys;
1827 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1828 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1830 printk("ctnetlink_init: cannot register notifier.\n");
1831 goto err_unreg_exp_subsys;
1834 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1836 printk("ctnetlink_init: cannot expect register notifier.\n");
1837 goto err_unreg_notifier;
1843 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1845 nf_conntrack_unregister_notifier(&ctnl_notifier);
1846 err_unreg_exp_subsys:
1847 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1850 nfnetlink_subsys_unregister(&ctnl_subsys);
1855 static void __exit ctnetlink_exit(void)
1857 printk("ctnetlink: unregistering from nfnetlink.\n");
1859 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1860 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1861 nf_conntrack_unregister_notifier(&ctnl_notifier);
1864 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1865 nfnetlink_subsys_unregister(&ctnl_subsys);
1869 module_init(ctnetlink_init);
1870 module_exit(ctnetlink_exit);