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>
31 #include <linux/netfilter.h>
32 #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 #include <net/netfilter/nf_conntrack_zones.h>
43 #ifdef CONFIG_NF_NAT_NEEDED
44 #include <net/netfilter/nf_nat_core.h>
45 #include <net/netfilter/nf_nat_protocol.h>
48 #include <linux/netfilter/nfnetlink.h>
49 #include <linux/netfilter/nfnetlink_conntrack.h>
51 MODULE_LICENSE("GPL");
53 static char __initdata version[] = "0.93";
56 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
57 const struct nf_conntrack_tuple *tuple,
58 struct nf_conntrack_l4proto *l4proto)
61 struct nlattr *nest_parms;
63 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
66 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
68 if (likely(l4proto->tuple_to_nlattr))
69 ret = l4proto->tuple_to_nlattr(skb, tuple);
71 nla_nest_end(skb, nest_parms);
80 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
81 const struct nf_conntrack_tuple *tuple,
82 struct nf_conntrack_l3proto *l3proto)
85 struct nlattr *nest_parms;
87 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
91 if (likely(l3proto->tuple_to_nlattr))
92 ret = l3proto->tuple_to_nlattr(skb, tuple);
94 nla_nest_end(skb, nest_parms);
103 ctnetlink_dump_tuples(struct sk_buff *skb,
104 const struct nf_conntrack_tuple *tuple)
107 struct nf_conntrack_l3proto *l3proto;
108 struct nf_conntrack_l4proto *l4proto;
110 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
111 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
113 if (unlikely(ret < 0))
116 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
117 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
123 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
125 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
133 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
135 long timeout = (ct->timeout.expires - jiffies) / HZ;
140 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
148 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
150 struct nf_conntrack_l4proto *l4proto;
151 struct nlattr *nest_proto;
154 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
155 if (!l4proto->to_nlattr)
158 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
160 goto nla_put_failure;
162 ret = l4proto->to_nlattr(skb, nest_proto, ct);
164 nla_nest_end(skb, nest_proto);
173 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
175 struct nlattr *nest_helper;
176 const struct nf_conn_help *help = nfct_help(ct);
177 struct nf_conntrack_helper *helper;
182 helper = rcu_dereference(help->helper);
186 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
188 goto nla_put_failure;
189 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
191 if (helper->to_nlattr)
192 helper->to_nlattr(skb, ct);
194 nla_nest_end(skb, nest_helper);
203 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
204 enum ip_conntrack_dir dir)
206 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
207 struct nlattr *nest_count;
208 const struct nf_conn_counter *acct;
210 acct = nf_conn_acct_find(ct);
214 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
216 goto nla_put_failure;
218 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
219 cpu_to_be64(acct[dir].packets));
220 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
221 cpu_to_be64(acct[dir].bytes));
223 nla_nest_end(skb, nest_count);
231 #ifdef CONFIG_NF_CONNTRACK_MARK
233 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
235 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
242 #define ctnetlink_dump_mark(a, b) (0)
245 #ifdef CONFIG_NF_CONNTRACK_SECMARK
247 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
249 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
256 #define ctnetlink_dump_secmark(a, b) (0)
259 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
262 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
264 struct nlattr *nest_parms;
266 if (!(ct->status & IPS_EXPECTED))
269 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
271 goto nla_put_failure;
272 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
273 goto nla_put_failure;
274 nla_nest_end(skb, nest_parms);
282 #ifdef CONFIG_NF_NAT_NEEDED
284 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
286 struct nlattr *nest_parms;
288 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
290 goto nla_put_failure;
292 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
293 htonl(natseq->correction_pos));
294 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
295 htonl(natseq->offset_before));
296 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
297 htonl(natseq->offset_after));
299 nla_nest_end(skb, nest_parms);
308 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
310 struct nf_nat_seq *natseq;
311 struct nf_conn_nat *nat = nfct_nat(ct);
313 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
316 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
317 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
320 natseq = &nat->seq[IP_CT_DIR_REPLY];
321 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
327 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
331 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
333 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
341 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
343 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
351 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
352 int event, struct nf_conn *ct)
354 struct nlmsghdr *nlh;
355 struct nfgenmsg *nfmsg;
356 struct nlattr *nest_parms;
357 unsigned int flags = pid ? NLM_F_MULTI : 0;
359 event |= NFNL_SUBSYS_CTNETLINK << 8;
360 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
364 nfmsg = nlmsg_data(nlh);
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, nf_ct_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, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
380 goto nla_put_failure;
381 nla_nest_end(skb, nest_parms);
384 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
386 if (ctnetlink_dump_status(skb, ct) < 0 ||
387 ctnetlink_dump_timeout(skb, ct) < 0 ||
388 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
389 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
390 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
391 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
392 ctnetlink_dump_mark(skb, ct) < 0 ||
393 ctnetlink_dump_secmark(skb, ct) < 0 ||
394 ctnetlink_dump_id(skb, ct) < 0 ||
395 ctnetlink_dump_use(skb, ct) < 0 ||
396 ctnetlink_dump_master(skb, ct) < 0 ||
397 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
398 goto nla_put_failure;
405 nlmsg_cancel(skb, nlh);
409 #ifdef CONFIG_NF_CONNTRACK_EVENTS
411 ctnetlink_proto_size(const struct nf_conn *ct)
413 struct nf_conntrack_l3proto *l3proto;
414 struct nf_conntrack_l4proto *l4proto;
418 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
419 len += l3proto->nla_size;
421 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
422 len += l4proto->nla_size;
429 ctnetlink_nlmsg_size(const struct nf_conn *ct)
431 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
432 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
433 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
434 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
435 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
436 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
437 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
438 #ifdef CONFIG_NF_CT_ACCT
439 + 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
440 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
441 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
443 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
444 + nla_total_size(0) /* CTA_PROTOINFO */
445 + nla_total_size(0) /* CTA_HELP */
446 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
447 #ifdef CONFIG_NF_CONNTRACK_SECMARK
448 + nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
450 #ifdef CONFIG_NF_NAT_NEEDED
451 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
452 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
454 #ifdef CONFIG_NF_CONNTRACK_MARK
455 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
457 + ctnetlink_proto_size(ct)
462 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
465 struct nlmsghdr *nlh;
466 struct nfgenmsg *nfmsg;
467 struct nlattr *nest_parms;
468 struct nf_conn *ct = item->ct;
471 unsigned int flags = 0, group;
474 /* ignore our fake conntrack entry */
475 if (ct == &nf_conntrack_untracked)
478 if (events & (1 << IPCT_DESTROY)) {
479 type = IPCTNL_MSG_CT_DELETE;
480 group = NFNLGRP_CONNTRACK_DESTROY;
481 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
482 type = IPCTNL_MSG_CT_NEW;
483 flags = NLM_F_CREATE|NLM_F_EXCL;
484 group = NFNLGRP_CONNTRACK_NEW;
486 type = IPCTNL_MSG_CT_NEW;
487 group = NFNLGRP_CONNTRACK_UPDATE;
492 if (!item->report && !nfnetlink_has_listeners(net, group))
495 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
499 type |= NFNL_SUBSYS_CTNETLINK << 8;
500 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
504 nfmsg = nlmsg_data(nlh);
505 nfmsg->nfgen_family = nf_ct_l3num(ct);
506 nfmsg->version = NFNETLINK_V0;
510 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
512 goto nla_put_failure;
513 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
514 goto nla_put_failure;
515 nla_nest_end(skb, nest_parms);
517 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
519 goto nla_put_failure;
520 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
521 goto nla_put_failure;
522 nla_nest_end(skb, nest_parms);
525 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
527 if (ctnetlink_dump_id(skb, ct) < 0)
528 goto nla_put_failure;
530 if (ctnetlink_dump_status(skb, ct) < 0)
531 goto nla_put_failure;
533 if (events & (1 << IPCT_DESTROY)) {
534 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
535 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
536 goto nla_put_failure;
538 if (ctnetlink_dump_timeout(skb, ct) < 0)
539 goto nla_put_failure;
541 if (events & (1 << IPCT_PROTOINFO)
542 && ctnetlink_dump_protoinfo(skb, ct) < 0)
543 goto nla_put_failure;
545 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
546 && ctnetlink_dump_helpinfo(skb, ct) < 0)
547 goto nla_put_failure;
549 #ifdef CONFIG_NF_CONNTRACK_SECMARK
550 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
551 && ctnetlink_dump_secmark(skb, ct) < 0)
552 goto nla_put_failure;
555 if (events & (1 << IPCT_RELATED) &&
556 ctnetlink_dump_master(skb, ct) < 0)
557 goto nla_put_failure;
559 if (events & (1 << IPCT_NATSEQADJ) &&
560 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
561 goto nla_put_failure;
564 #ifdef CONFIG_NF_CONNTRACK_MARK
565 if ((events & (1 << IPCT_MARK) || ct->mark)
566 && ctnetlink_dump_mark(skb, ct) < 0)
567 goto nla_put_failure;
572 err = nfnetlink_send(skb, net, item->pid, group, item->report,
574 if (err == -ENOBUFS || err == -EAGAIN)
581 nlmsg_cancel(skb, nlh);
585 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
590 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
592 static int ctnetlink_done(struct netlink_callback *cb)
595 nf_ct_put((struct nf_conn *)cb->args[1]);
600 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
602 struct net *net = sock_net(skb->sk);
603 struct nf_conn *ct, *last;
604 struct nf_conntrack_tuple_hash *h;
605 struct hlist_nulls_node *n;
606 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
607 u_int8_t l3proto = nfmsg->nfgen_family;
610 last = (struct nf_conn *)cb->args[1];
611 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
613 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
615 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
617 ct = nf_ct_tuplehash_to_ctrack(h);
618 if (!atomic_inc_not_zero(&ct->ct_general.use))
620 /* Dump entries of a given L3 protocol number.
621 * If it is not specified, ie. l3proto == 0,
622 * then dump everything. */
623 if (l3proto && nf_ct_l3num(ct) != l3proto)
630 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
632 IPCTNL_MSG_CT_NEW, ct) < 0) {
633 cb->args[1] = (unsigned long)ct;
637 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
638 IPCTNL_MSG_CT_GET_CTRZERO) {
639 struct nf_conn_counter *acct;
641 acct = nf_conn_acct_find(ct);
643 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
662 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
664 struct nlattr *tb[CTA_IP_MAX+1];
665 struct nf_conntrack_l3proto *l3proto;
668 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
671 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
673 if (likely(l3proto->nlattr_to_tuple)) {
674 ret = nla_validate_nested(attr, CTA_IP_MAX,
675 l3proto->nla_policy);
677 ret = l3proto->nlattr_to_tuple(tb, tuple);
685 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
686 [CTA_PROTO_NUM] = { .type = NLA_U8 },
690 ctnetlink_parse_tuple_proto(struct nlattr *attr,
691 struct nf_conntrack_tuple *tuple)
693 struct nlattr *tb[CTA_PROTO_MAX+1];
694 struct nf_conntrack_l4proto *l4proto;
697 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
701 if (!tb[CTA_PROTO_NUM])
703 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
706 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
708 if (likely(l4proto->nlattr_to_tuple)) {
709 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
710 l4proto->nla_policy);
712 ret = l4proto->nlattr_to_tuple(tb, tuple);
720 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
721 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
722 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
726 ctnetlink_parse_tuple(const struct nlattr * const cda[],
727 struct nf_conntrack_tuple *tuple,
728 enum ctattr_tuple type, u_int8_t l3num)
730 struct nlattr *tb[CTA_TUPLE_MAX+1];
733 memset(tuple, 0, sizeof(*tuple));
735 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
737 if (!tb[CTA_TUPLE_IP])
740 tuple->src.l3num = l3num;
742 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
746 if (!tb[CTA_TUPLE_PROTO])
749 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
753 /* orig and expect tuples get DIR_ORIGINAL */
754 if (type == CTA_TUPLE_REPLY)
755 tuple->dst.dir = IP_CT_DIR_REPLY;
757 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
763 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
766 #ifdef CONFIG_NF_CONNTRACK_ZONES
767 *zone = ntohs(nla_get_be16(attr));
777 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
778 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
782 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
784 struct nlattr *tb[CTA_HELP_MAX+1];
786 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
788 if (!tb[CTA_HELP_NAME])
791 *helper_name = nla_data(tb[CTA_HELP_NAME]);
796 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
797 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
798 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
799 [CTA_STATUS] = { .type = NLA_U32 },
800 [CTA_PROTOINFO] = { .type = NLA_NESTED },
801 [CTA_HELP] = { .type = NLA_NESTED },
802 [CTA_NAT_SRC] = { .type = NLA_NESTED },
803 [CTA_TIMEOUT] = { .type = NLA_U32 },
804 [CTA_MARK] = { .type = NLA_U32 },
805 [CTA_ID] = { .type = NLA_U32 },
806 [CTA_NAT_DST] = { .type = NLA_NESTED },
807 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
808 [CTA_ZONE] = { .type = NLA_U16 },
812 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
813 const struct nlmsghdr *nlh,
814 const struct nlattr * const cda[])
816 struct net *net = sock_net(ctnl);
817 struct nf_conntrack_tuple_hash *h;
818 struct nf_conntrack_tuple tuple;
820 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
821 u_int8_t u3 = nfmsg->nfgen_family;
825 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
829 if (cda[CTA_TUPLE_ORIG])
830 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
831 else if (cda[CTA_TUPLE_REPLY])
832 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
834 /* Flush the whole table */
835 nf_conntrack_flush_report(net,
844 h = nf_conntrack_find_get(net, zone, &tuple);
848 ct = nf_ct_tuplehash_to_ctrack(h);
851 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
852 if (id != (u32)(unsigned long)ct) {
858 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
860 nlmsg_report(nlh)) < 0) {
861 nf_ct_delete_from_lists(ct);
862 /* we failed to report the event, try later */
863 nf_ct_insert_dying_list(ct);
868 /* death_by_timeout would report the event again */
869 set_bit(IPS_DYING_BIT, &ct->status);
878 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
879 const struct nlmsghdr *nlh,
880 const struct nlattr * const cda[])
882 struct net *net = sock_net(ctnl);
883 struct nf_conntrack_tuple_hash *h;
884 struct nf_conntrack_tuple tuple;
886 struct sk_buff *skb2 = NULL;
887 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
888 u_int8_t u3 = nfmsg->nfgen_family;
892 if (nlh->nlmsg_flags & NLM_F_DUMP)
893 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
896 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
900 if (cda[CTA_TUPLE_ORIG])
901 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
902 else if (cda[CTA_TUPLE_REPLY])
903 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
910 h = nf_conntrack_find_get(net, zone, &tuple);
914 ct = nf_ct_tuplehash_to_ctrack(h);
917 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
924 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
925 IPCTNL_MSG_CT_NEW, ct);
931 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
943 #ifdef CONFIG_NF_NAT_NEEDED
945 ctnetlink_parse_nat_setup(struct nf_conn *ct,
946 enum nf_nat_manip_type manip,
947 const struct nlattr *attr)
949 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
951 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
952 if (!parse_nat_setup) {
953 #ifdef CONFIG_MODULES
955 spin_unlock_bh(&nf_conntrack_lock);
957 if (request_module("nf-nat-ipv4") < 0) {
959 spin_lock_bh(&nf_conntrack_lock);
964 spin_lock_bh(&nf_conntrack_lock);
966 if (nfnetlink_parse_nat_setup_hook)
972 return parse_nat_setup(ct, manip, attr);
977 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
980 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
981 d = ct->status ^ status;
983 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
987 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
988 /* SEEN_REPLY bit can only be set */
991 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
992 /* ASSURED bit can only be set */
995 /* Be careful here, modifying NAT bits can screw up things,
996 * so don't let users modify them directly if they don't pass
998 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1003 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1005 #ifdef CONFIG_NF_NAT_NEEDED
1008 if (cda[CTA_NAT_DST]) {
1009 ret = ctnetlink_parse_nat_setup(ct,
1015 if (cda[CTA_NAT_SRC]) {
1016 ret = ctnetlink_parse_nat_setup(ct,
1029 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1031 struct nf_conntrack_helper *helper;
1032 struct nf_conn_help *help = nfct_help(ct);
1033 char *helpname = NULL;
1036 /* don't change helper of sibling connections */
1040 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1044 if (!strcmp(helpname, "")) {
1045 if (help && help->helper) {
1046 /* we had a helper before ... */
1047 nf_ct_remove_expectations(ct);
1048 rcu_assign_pointer(help->helper, NULL);
1054 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1055 nf_ct_protonum(ct));
1056 if (helper == NULL) {
1057 #ifdef CONFIG_MODULES
1058 spin_unlock_bh(&nf_conntrack_lock);
1060 if (request_module("nfct-helper-%s", helpname) < 0) {
1061 spin_lock_bh(&nf_conntrack_lock);
1065 spin_lock_bh(&nf_conntrack_lock);
1066 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1067 nf_ct_protonum(ct));
1075 if (help->helper == helper)
1079 /* need to zero data of old helper */
1080 memset(&help->help, 0, sizeof(help->help));
1082 /* we cannot set a helper for an existing conntrack */
1086 rcu_assign_pointer(help->helper, helper);
1092 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1094 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1096 if (!del_timer(&ct->timeout))
1099 ct->timeout.expires = jiffies + timeout * HZ;
1100 add_timer(&ct->timeout);
1105 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1106 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1107 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1108 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1112 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1114 const struct nlattr *attr = cda[CTA_PROTOINFO];
1115 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1116 struct nf_conntrack_l4proto *l4proto;
1119 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1122 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1123 if (l4proto->from_nlattr)
1124 err = l4proto->from_nlattr(tb, ct);
1130 #ifdef CONFIG_NF_NAT_NEEDED
1131 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1132 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1133 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1134 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1138 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1140 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1142 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1144 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1147 natseq->correction_pos =
1148 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1150 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1153 natseq->offset_before =
1154 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1156 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1159 natseq->offset_after =
1160 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1166 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1167 const struct nlattr * const cda[])
1170 struct nf_conn_nat *nat = nfct_nat(ct);
1175 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1176 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1177 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1181 ct->status |= IPS_SEQ_ADJUST;
1184 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1185 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1186 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1190 ct->status |= IPS_SEQ_ADJUST;
1198 ctnetlink_change_conntrack(struct nf_conn *ct,
1199 const struct nlattr * const cda[])
1203 /* only allow NAT changes and master assignation for new conntracks */
1204 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1207 if (cda[CTA_HELP]) {
1208 err = ctnetlink_change_helper(ct, cda);
1213 if (cda[CTA_TIMEOUT]) {
1214 err = ctnetlink_change_timeout(ct, cda);
1219 if (cda[CTA_STATUS]) {
1220 err = ctnetlink_change_status(ct, cda);
1225 if (cda[CTA_PROTOINFO]) {
1226 err = ctnetlink_change_protoinfo(ct, cda);
1231 #if defined(CONFIG_NF_CONNTRACK_MARK)
1233 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1236 #ifdef CONFIG_NF_NAT_NEEDED
1237 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1238 err = ctnetlink_change_nat_seq_adj(ct, cda);
1247 static struct nf_conn *
1248 ctnetlink_create_conntrack(struct net *net, u16 zone,
1249 const struct nlattr * const cda[],
1250 struct nf_conntrack_tuple *otuple,
1251 struct nf_conntrack_tuple *rtuple,
1256 struct nf_conntrack_helper *helper;
1258 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1260 return ERR_PTR(-ENOMEM);
1262 if (!cda[CTA_TIMEOUT])
1264 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1266 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1269 if (cda[CTA_HELP]) {
1270 char *helpname = NULL;
1272 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1276 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1277 nf_ct_protonum(ct));
1278 if (helper == NULL) {
1280 #ifdef CONFIG_MODULES
1281 if (request_module("nfct-helper-%s", helpname) < 0) {
1287 helper = __nf_conntrack_helper_find(helpname,
1289 nf_ct_protonum(ct));
1299 struct nf_conn_help *help;
1301 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1307 /* not in hash table yet so not strictly necessary */
1308 rcu_assign_pointer(help->helper, helper);
1311 /* try an implicit helper assignation */
1312 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1317 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1318 err = ctnetlink_change_nat(ct, cda);
1323 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1324 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1325 /* we must add conntrack extensions before confirmation. */
1326 ct->status |= IPS_CONFIRMED;
1328 if (cda[CTA_STATUS]) {
1329 err = ctnetlink_change_status(ct, cda);
1334 #ifdef CONFIG_NF_NAT_NEEDED
1335 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1336 err = ctnetlink_change_nat_seq_adj(ct, cda);
1342 if (cda[CTA_PROTOINFO]) {
1343 err = ctnetlink_change_protoinfo(ct, cda);
1348 #if defined(CONFIG_NF_CONNTRACK_MARK)
1350 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1353 /* setup master conntrack: this is a confirmed expectation */
1354 if (cda[CTA_TUPLE_MASTER]) {
1355 struct nf_conntrack_tuple master;
1356 struct nf_conntrack_tuple_hash *master_h;
1357 struct nf_conn *master_ct;
1359 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1363 master_h = nf_conntrack_find_get(net, zone, &master);
1364 if (master_h == NULL) {
1368 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1369 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1370 ct->master = master_ct;
1373 add_timer(&ct->timeout);
1374 nf_conntrack_hash_insert(ct);
1382 nf_conntrack_free(ct);
1383 return ERR_PTR(err);
1387 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1388 const struct nlmsghdr *nlh,
1389 const struct nlattr * const cda[])
1391 struct net *net = sock_net(ctnl);
1392 struct nf_conntrack_tuple otuple, rtuple;
1393 struct nf_conntrack_tuple_hash *h = NULL;
1394 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1395 u_int8_t u3 = nfmsg->nfgen_family;
1399 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1403 if (cda[CTA_TUPLE_ORIG]) {
1404 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1409 if (cda[CTA_TUPLE_REPLY]) {
1410 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1415 spin_lock_bh(&nf_conntrack_lock);
1416 if (cda[CTA_TUPLE_ORIG])
1417 h = __nf_conntrack_find(net, zone, &otuple);
1418 else if (cda[CTA_TUPLE_REPLY])
1419 h = __nf_conntrack_find(net, zone, &rtuple);
1423 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1425 enum ip_conntrack_events events;
1427 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1434 nf_conntrack_get(&ct->ct_general);
1435 spin_unlock_bh(&nf_conntrack_lock);
1436 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1437 events = IPCT_RELATED;
1441 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1442 (1 << IPCT_ASSURED) |
1443 (1 << IPCT_HELPER) |
1444 (1 << IPCT_PROTOINFO) |
1445 (1 << IPCT_NATSEQADJ) |
1446 (1 << IPCT_MARK) | events,
1447 ct, NETLINK_CB(skb).pid,
1451 spin_unlock_bh(&nf_conntrack_lock);
1455 /* implicit 'else' */
1457 /* We manipulate the conntrack inside the global conntrack table lock,
1458 * so there's no need to increase the refcount */
1460 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1461 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1463 err = ctnetlink_change_conntrack(ct, cda);
1465 nf_conntrack_get(&ct->ct_general);
1466 spin_unlock_bh(&nf_conntrack_lock);
1467 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1468 (1 << IPCT_ASSURED) |
1469 (1 << IPCT_HELPER) |
1470 (1 << IPCT_PROTOINFO) |
1471 (1 << IPCT_NATSEQADJ) |
1473 ct, NETLINK_CB(skb).pid,
1477 spin_unlock_bh(&nf_conntrack_lock);
1483 spin_unlock_bh(&nf_conntrack_lock);
1487 /***********************************************************************
1489 ***********************************************************************/
1492 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1493 const struct nf_conntrack_tuple *tuple,
1494 enum ctattr_expect type)
1496 struct nlattr *nest_parms;
1498 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1500 goto nla_put_failure;
1501 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1502 goto nla_put_failure;
1503 nla_nest_end(skb, nest_parms);
1512 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1513 const struct nf_conntrack_tuple *tuple,
1514 const struct nf_conntrack_tuple_mask *mask)
1517 struct nf_conntrack_l3proto *l3proto;
1518 struct nf_conntrack_l4proto *l4proto;
1519 struct nf_conntrack_tuple m;
1520 struct nlattr *nest_parms;
1522 memset(&m, 0xFF, sizeof(m));
1523 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1524 m.src.u.all = mask->src.u.all;
1525 m.dst.protonum = tuple->dst.protonum;
1527 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1529 goto nla_put_failure;
1531 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1532 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1534 if (unlikely(ret < 0))
1535 goto nla_put_failure;
1537 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1538 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1539 if (unlikely(ret < 0))
1540 goto nla_put_failure;
1542 nla_nest_end(skb, nest_parms);
1551 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1552 const struct nf_conntrack_expect *exp)
1554 struct nf_conn *master = exp->master;
1555 struct nf_conntrack_helper *helper;
1556 long timeout = (exp->timeout.expires - jiffies) / HZ;
1561 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1562 goto nla_put_failure;
1563 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1564 goto nla_put_failure;
1565 if (ctnetlink_exp_dump_tuple(skb,
1566 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1567 CTA_EXPECT_MASTER) < 0)
1568 goto nla_put_failure;
1570 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1571 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1572 helper = rcu_dereference(nfct_help(master)->helper);
1574 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1583 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1584 int event, const struct nf_conntrack_expect *exp)
1586 struct nlmsghdr *nlh;
1587 struct nfgenmsg *nfmsg;
1588 unsigned int flags = pid ? NLM_F_MULTI : 0;
1590 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1591 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1595 nfmsg = nlmsg_data(nlh);
1596 nfmsg->nfgen_family = exp->tuple.src.l3num;
1597 nfmsg->version = NFNETLINK_V0;
1600 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1601 goto nla_put_failure;
1603 nlmsg_end(skb, nlh);
1608 nlmsg_cancel(skb, nlh);
1612 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1614 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1616 struct nf_conntrack_expect *exp = item->exp;
1617 struct net *net = nf_ct_exp_net(exp);
1618 struct nlmsghdr *nlh;
1619 struct nfgenmsg *nfmsg;
1620 struct sk_buff *skb;
1624 if (events & (1 << IPEXP_NEW)) {
1625 type = IPCTNL_MSG_EXP_NEW;
1626 flags = NLM_F_CREATE|NLM_F_EXCL;
1630 if (!item->report &&
1631 !nfnetlink_has_listeners(net, NFNLGRP_CONNTRACK_EXP_NEW))
1634 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1638 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1639 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1643 nfmsg = nlmsg_data(nlh);
1644 nfmsg->nfgen_family = exp->tuple.src.l3num;
1645 nfmsg->version = NFNETLINK_V0;
1649 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1650 goto nla_put_failure;
1653 nlmsg_end(skb, nlh);
1654 nfnetlink_send(skb, net, item->pid, NFNLGRP_CONNTRACK_EXP_NEW,
1655 item->report, GFP_ATOMIC);
1660 nlmsg_cancel(skb, nlh);
1664 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1668 static int ctnetlink_exp_done(struct netlink_callback *cb)
1671 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1676 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1678 struct net *net = sock_net(skb->sk);
1679 struct nf_conntrack_expect *exp, *last;
1680 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1681 struct hlist_node *n;
1682 u_int8_t l3proto = nfmsg->nfgen_family;
1685 last = (struct nf_conntrack_expect *)cb->args[1];
1686 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1688 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1690 if (l3proto && exp->tuple.src.l3num != l3proto)
1697 if (ctnetlink_exp_fill_info(skb,
1698 NETLINK_CB(cb->skb).pid,
1702 if (!atomic_inc_not_zero(&exp->use))
1704 cb->args[1] = (unsigned long)exp;
1716 nf_ct_expect_put(last);
1721 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1722 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1723 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1724 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1725 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1726 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1727 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1731 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1732 const struct nlmsghdr *nlh,
1733 const struct nlattr * const cda[])
1735 struct net *net = sock_net(ctnl);
1736 struct nf_conntrack_tuple tuple;
1737 struct nf_conntrack_expect *exp;
1738 struct sk_buff *skb2;
1739 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1740 u_int8_t u3 = nfmsg->nfgen_family;
1744 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1745 return netlink_dump_start(ctnl, skb, nlh,
1746 ctnetlink_exp_dump_table,
1747 ctnetlink_exp_done);
1750 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1754 if (cda[CTA_EXPECT_MASTER])
1755 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1762 exp = nf_ct_expect_find_get(net, zone, &tuple);
1766 if (cda[CTA_EXPECT_ID]) {
1767 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1768 if (ntohl(id) != (u32)(unsigned long)exp) {
1769 nf_ct_expect_put(exp);
1775 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1780 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1781 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1786 nf_ct_expect_put(exp);
1788 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1793 nf_ct_expect_put(exp);
1798 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1799 const struct nlmsghdr *nlh,
1800 const struct nlattr * const cda[])
1802 struct net *net = sock_net(ctnl);
1803 struct nf_conntrack_expect *exp;
1804 struct nf_conntrack_tuple tuple;
1805 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1806 struct hlist_node *n, *next;
1807 u_int8_t u3 = nfmsg->nfgen_family;
1812 if (cda[CTA_EXPECT_TUPLE]) {
1813 /* delete a single expect by tuple */
1814 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1818 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1822 /* bump usage count to 2 */
1823 exp = nf_ct_expect_find_get(net, zone, &tuple);
1827 if (cda[CTA_EXPECT_ID]) {
1828 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1829 if (ntohl(id) != (u32)(unsigned long)exp) {
1830 nf_ct_expect_put(exp);
1835 /* after list removal, usage count == 1 */
1836 nf_ct_unexpect_related(exp);
1837 /* have to put what we 'get' above.
1838 * after this line usage count == 0 */
1839 nf_ct_expect_put(exp);
1840 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1841 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1842 struct nf_conn_help *m_help;
1844 /* delete all expectations for this helper */
1845 spin_lock_bh(&nf_conntrack_lock);
1846 for (i = 0; i < nf_ct_expect_hsize; i++) {
1847 hlist_for_each_entry_safe(exp, n, next,
1848 &net->ct.expect_hash[i],
1850 m_help = nfct_help(exp->master);
1851 if (!strcmp(m_help->helper->name, name) &&
1852 del_timer(&exp->timeout)) {
1853 nf_ct_unlink_expect(exp);
1854 nf_ct_expect_put(exp);
1858 spin_unlock_bh(&nf_conntrack_lock);
1860 /* This basically means we have to flush everything*/
1861 spin_lock_bh(&nf_conntrack_lock);
1862 for (i = 0; i < nf_ct_expect_hsize; i++) {
1863 hlist_for_each_entry_safe(exp, n, next,
1864 &net->ct.expect_hash[i],
1866 if (del_timer(&exp->timeout)) {
1867 nf_ct_unlink_expect(exp);
1868 nf_ct_expect_put(exp);
1872 spin_unlock_bh(&nf_conntrack_lock);
1878 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1879 const struct nlattr * const cda[])
1885 ctnetlink_create_expect(struct net *net, u16 zone,
1886 const struct nlattr * const cda[],
1888 u32 pid, int report)
1890 struct nf_conntrack_tuple tuple, mask, master_tuple;
1891 struct nf_conntrack_tuple_hash *h = NULL;
1892 struct nf_conntrack_expect *exp;
1894 struct nf_conn_help *help;
1897 /* caller guarantees that those three CTA_EXPECT_* exist */
1898 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1901 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1904 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1908 /* Look for master conntrack of this expectation */
1909 h = nf_conntrack_find_get(net, zone, &master_tuple);
1912 ct = nf_ct_tuplehash_to_ctrack(h);
1913 help = nfct_help(ct);
1915 if (!help || !help->helper) {
1916 /* such conntrack hasn't got any helper, abort */
1921 exp = nf_ct_expect_alloc(ct);
1928 exp->expectfn = NULL;
1932 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1933 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1934 exp->mask.src.u.all = mask.src.u.all;
1936 err = nf_ct_expect_related_report(exp, pid, report);
1937 nf_ct_expect_put(exp);
1940 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1945 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1946 const struct nlmsghdr *nlh,
1947 const struct nlattr * const cda[])
1949 struct net *net = sock_net(ctnl);
1950 struct nf_conntrack_tuple tuple;
1951 struct nf_conntrack_expect *exp;
1952 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1953 u_int8_t u3 = nfmsg->nfgen_family;
1957 if (!cda[CTA_EXPECT_TUPLE]
1958 || !cda[CTA_EXPECT_MASK]
1959 || !cda[CTA_EXPECT_MASTER])
1962 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1966 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1970 spin_lock_bh(&nf_conntrack_lock);
1971 exp = __nf_ct_expect_find(net, zone, &tuple);
1974 spin_unlock_bh(&nf_conntrack_lock);
1976 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1977 err = ctnetlink_create_expect(net, zone, cda,
1979 NETLINK_CB(skb).pid,
1986 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1987 err = ctnetlink_change_expect(exp, cda);
1988 spin_unlock_bh(&nf_conntrack_lock);
1993 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1994 static struct nf_ct_event_notifier ctnl_notifier = {
1995 .fcn = ctnetlink_conntrack_event,
1998 static struct nf_exp_event_notifier ctnl_notifier_exp = {
1999 .fcn = ctnetlink_expect_event,
2003 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2004 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2005 .attr_count = CTA_MAX,
2006 .policy = ct_nla_policy },
2007 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2008 .attr_count = CTA_MAX,
2009 .policy = ct_nla_policy },
2010 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2011 .attr_count = CTA_MAX,
2012 .policy = ct_nla_policy },
2013 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2014 .attr_count = CTA_MAX,
2015 .policy = ct_nla_policy },
2018 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2019 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2020 .attr_count = CTA_EXPECT_MAX,
2021 .policy = exp_nla_policy },
2022 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2023 .attr_count = CTA_EXPECT_MAX,
2024 .policy = exp_nla_policy },
2025 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2026 .attr_count = CTA_EXPECT_MAX,
2027 .policy = exp_nla_policy },
2030 static const struct nfnetlink_subsystem ctnl_subsys = {
2031 .name = "conntrack",
2032 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2033 .cb_count = IPCTNL_MSG_MAX,
2037 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2038 .name = "conntrack_expect",
2039 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2040 .cb_count = IPCTNL_MSG_EXP_MAX,
2044 MODULE_ALIAS("ip_conntrack_netlink");
2045 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2046 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2048 static int __init ctnetlink_init(void)
2052 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
2053 ret = nfnetlink_subsys_register(&ctnl_subsys);
2055 printk("ctnetlink_init: cannot register with nfnetlink.\n");
2059 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2061 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
2062 goto err_unreg_subsys;
2065 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2066 ret = nf_conntrack_register_notifier(&ctnl_notifier);
2068 printk("ctnetlink_init: cannot register notifier.\n");
2069 goto err_unreg_exp_subsys;
2072 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2074 printk("ctnetlink_init: cannot expect register notifier.\n");
2075 goto err_unreg_notifier;
2081 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2083 nf_conntrack_unregister_notifier(&ctnl_notifier);
2084 err_unreg_exp_subsys:
2085 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2088 nfnetlink_subsys_unregister(&ctnl_subsys);
2093 static void __exit ctnetlink_exit(void)
2095 printk("ctnetlink: unregistering from nfnetlink.\n");
2097 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2098 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2099 nf_conntrack_unregister_notifier(&ctnl_notifier);
2102 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2103 nfnetlink_subsys_unregister(&ctnl_subsys);
2107 module_init(ctnetlink_init);
2108 module_exit(ctnetlink_exit);