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 #ifdef CONFIG_NF_NAT_NEEDED
43 #include <net/netfilter/nf_nat_core.h>
44 #include <net/netfilter/nf_nat_protocol.h>
47 #include <linux/netfilter/nfnetlink.h>
48 #include <linux/netfilter/nfnetlink_conntrack.h>
50 MODULE_LICENSE("GPL");
52 static char __initdata version[] = "0.93";
55 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
56 const struct nf_conntrack_tuple *tuple,
57 struct nf_conntrack_l4proto *l4proto)
60 struct nlattr *nest_parms;
62 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
65 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
67 if (likely(l4proto->tuple_to_nlattr))
68 ret = l4proto->tuple_to_nlattr(skb, tuple);
70 nla_nest_end(skb, nest_parms);
79 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
80 const struct nf_conntrack_tuple *tuple,
81 struct nf_conntrack_l3proto *l3proto)
84 struct nlattr *nest_parms;
86 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
90 if (likely(l3proto->tuple_to_nlattr))
91 ret = l3proto->tuple_to_nlattr(skb, tuple);
93 nla_nest_end(skb, nest_parms);
102 ctnetlink_dump_tuples(struct sk_buff *skb,
103 const struct nf_conntrack_tuple *tuple)
106 struct nf_conntrack_l3proto *l3proto;
107 struct nf_conntrack_l4proto *l4proto;
109 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
110 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
112 if (unlikely(ret < 0))
115 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
116 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
122 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
124 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
132 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
134 long timeout = (ct->timeout.expires - jiffies) / HZ;
139 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
147 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
149 struct nf_conntrack_l4proto *l4proto;
150 struct nlattr *nest_proto;
153 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
154 if (!l4proto->to_nlattr)
157 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
159 goto nla_put_failure;
161 ret = l4proto->to_nlattr(skb, nest_proto, ct);
163 nla_nest_end(skb, nest_proto);
172 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
174 struct nlattr *nest_helper;
175 const struct nf_conn_help *help = nfct_help(ct);
176 struct nf_conntrack_helper *helper;
181 helper = rcu_dereference(help->helper);
185 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
187 goto nla_put_failure;
188 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
190 if (helper->to_nlattr)
191 helper->to_nlattr(skb, ct);
193 nla_nest_end(skb, nest_helper);
202 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
203 enum ip_conntrack_dir dir)
205 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
206 struct nlattr *nest_count;
207 const struct nf_conn_counter *acct;
209 acct = nf_conn_acct_find(ct);
213 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
215 goto nla_put_failure;
217 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
218 cpu_to_be64(acct[dir].packets));
219 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
220 cpu_to_be64(acct[dir].bytes));
222 nla_nest_end(skb, nest_count);
230 #ifdef CONFIG_NF_CONNTRACK_MARK
232 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
234 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
241 #define ctnetlink_dump_mark(a, b) (0)
244 #ifdef CONFIG_NF_CONNTRACK_SECMARK
246 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
248 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
255 #define ctnetlink_dump_secmark(a, b) (0)
258 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
261 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
263 struct nlattr *nest_parms;
265 if (!(ct->status & IPS_EXPECTED))
268 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
270 goto nla_put_failure;
271 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
272 goto nla_put_failure;
273 nla_nest_end(skb, nest_parms);
281 #ifdef CONFIG_NF_NAT_NEEDED
283 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
285 struct nlattr *nest_parms;
287 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
289 goto nla_put_failure;
291 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
292 htonl(natseq->correction_pos));
293 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
294 htonl(natseq->offset_before));
295 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
296 htonl(natseq->offset_after));
298 nla_nest_end(skb, nest_parms);
307 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
309 struct nf_nat_seq *natseq;
310 struct nf_conn_nat *nat = nfct_nat(ct);
312 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
315 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
316 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
319 natseq = &nat->seq[IP_CT_DIR_REPLY];
320 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
326 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
330 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
332 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
340 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
342 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
350 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
351 int event, struct nf_conn *ct)
353 struct nlmsghdr *nlh;
354 struct nfgenmsg *nfmsg;
355 struct nlattr *nest_parms;
356 unsigned int flags = pid ? NLM_F_MULTI : 0;
358 event |= NFNL_SUBSYS_CTNETLINK << 8;
359 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
363 nfmsg = nlmsg_data(nlh);
364 nfmsg->nfgen_family = nf_ct_l3num(ct);
365 nfmsg->version = NFNETLINK_V0;
368 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
370 goto nla_put_failure;
371 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
372 goto nla_put_failure;
373 nla_nest_end(skb, nest_parms);
375 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
377 goto nla_put_failure;
378 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
379 goto nla_put_failure;
380 nla_nest_end(skb, nest_parms);
382 if (ctnetlink_dump_status(skb, ct) < 0 ||
383 ctnetlink_dump_timeout(skb, ct) < 0 ||
384 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
385 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
386 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
387 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
388 ctnetlink_dump_mark(skb, ct) < 0 ||
389 ctnetlink_dump_secmark(skb, ct) < 0 ||
390 ctnetlink_dump_id(skb, ct) < 0 ||
391 ctnetlink_dump_use(skb, ct) < 0 ||
392 ctnetlink_dump_master(skb, ct) < 0 ||
393 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
394 goto nla_put_failure;
401 nlmsg_cancel(skb, nlh);
405 #ifdef CONFIG_NF_CONNTRACK_EVENTS
407 ctnetlink_proto_size(const struct nf_conn *ct)
409 struct nf_conntrack_l3proto *l3proto;
410 struct nf_conntrack_l4proto *l4proto;
414 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
415 len += l3proto->nla_size;
417 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
418 len += l4proto->nla_size;
425 ctnetlink_nlmsg_size(const struct nf_conn *ct)
427 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
428 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
429 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
430 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
431 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
432 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
433 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
434 #ifdef CONFIG_NF_CT_ACCT
435 + 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
436 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
437 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
439 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
440 + nla_total_size(0) /* CTA_PROTOINFO */
441 + nla_total_size(0) /* CTA_HELP */
442 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
443 #ifdef CONFIG_NF_CONNTRACK_SECMARK
444 + nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
446 #ifdef CONFIG_NF_NAT_NEEDED
447 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
448 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
450 #ifdef CONFIG_NF_CONNTRACK_MARK
451 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
453 + ctnetlink_proto_size(ct)
458 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
461 struct nlmsghdr *nlh;
462 struct nfgenmsg *nfmsg;
463 struct nlattr *nest_parms;
464 struct nf_conn *ct = item->ct;
467 unsigned int flags = 0, group;
470 /* ignore our fake conntrack entry */
471 if (ct == &nf_conntrack_untracked)
474 if (events & (1 << IPCT_DESTROY)) {
475 type = IPCTNL_MSG_CT_DELETE;
476 group = NFNLGRP_CONNTRACK_DESTROY;
477 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
478 type = IPCTNL_MSG_CT_NEW;
479 flags = NLM_F_CREATE|NLM_F_EXCL;
480 group = NFNLGRP_CONNTRACK_NEW;
482 type = IPCTNL_MSG_CT_NEW;
483 group = NFNLGRP_CONNTRACK_UPDATE;
488 if (!item->report && !nfnetlink_has_listeners(net, group))
491 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
495 type |= NFNL_SUBSYS_CTNETLINK << 8;
496 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
500 nfmsg = nlmsg_data(nlh);
501 nfmsg->nfgen_family = nf_ct_l3num(ct);
502 nfmsg->version = NFNETLINK_V0;
506 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
508 goto nla_put_failure;
509 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
510 goto nla_put_failure;
511 nla_nest_end(skb, nest_parms);
513 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
515 goto nla_put_failure;
516 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
517 goto nla_put_failure;
518 nla_nest_end(skb, nest_parms);
520 if (ctnetlink_dump_id(skb, ct) < 0)
521 goto nla_put_failure;
523 if (ctnetlink_dump_status(skb, ct) < 0)
524 goto nla_put_failure;
526 if (events & (1 << IPCT_DESTROY)) {
527 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
528 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
529 goto nla_put_failure;
531 if (ctnetlink_dump_timeout(skb, ct) < 0)
532 goto nla_put_failure;
534 if (events & (1 << IPCT_PROTOINFO)
535 && ctnetlink_dump_protoinfo(skb, ct) < 0)
536 goto nla_put_failure;
538 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
539 && ctnetlink_dump_helpinfo(skb, ct) < 0)
540 goto nla_put_failure;
542 #ifdef CONFIG_NF_CONNTRACK_SECMARK
543 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
544 && ctnetlink_dump_secmark(skb, ct) < 0)
545 goto nla_put_failure;
548 if (events & (1 << IPCT_RELATED) &&
549 ctnetlink_dump_master(skb, ct) < 0)
550 goto nla_put_failure;
552 if (events & (1 << IPCT_NATSEQADJ) &&
553 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
554 goto nla_put_failure;
557 #ifdef CONFIG_NF_CONNTRACK_MARK
558 if ((events & (1 << IPCT_MARK) || ct->mark)
559 && ctnetlink_dump_mark(skb, ct) < 0)
560 goto nla_put_failure;
565 err = nfnetlink_send(skb, net, item->pid, group, item->report,
567 if (err == -ENOBUFS || err == -EAGAIN)
574 nlmsg_cancel(skb, nlh);
578 nfnetlink_set_err(net, 0, group, -ENOBUFS);
581 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
583 static int ctnetlink_done(struct netlink_callback *cb)
586 nf_ct_put((struct nf_conn *)cb->args[1]);
591 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
593 struct net *net = sock_net(skb->sk);
594 struct nf_conn *ct, *last;
595 struct nf_conntrack_tuple_hash *h;
596 struct hlist_nulls_node *n;
597 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
598 u_int8_t l3proto = nfmsg->nfgen_family;
601 last = (struct nf_conn *)cb->args[1];
602 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
604 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
606 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
608 ct = nf_ct_tuplehash_to_ctrack(h);
609 if (!atomic_inc_not_zero(&ct->ct_general.use))
611 /* Dump entries of a given L3 protocol number.
612 * If it is not specified, ie. l3proto == 0,
613 * then dump everything. */
614 if (l3proto && nf_ct_l3num(ct) != l3proto)
621 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
623 IPCTNL_MSG_CT_NEW, ct) < 0) {
624 cb->args[1] = (unsigned long)ct;
628 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
629 IPCTNL_MSG_CT_GET_CTRZERO) {
630 struct nf_conn_counter *acct;
632 acct = nf_conn_acct_find(ct);
634 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
653 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
655 struct nlattr *tb[CTA_IP_MAX+1];
656 struct nf_conntrack_l3proto *l3proto;
659 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
662 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
664 if (likely(l3proto->nlattr_to_tuple)) {
665 ret = nla_validate_nested(attr, CTA_IP_MAX,
666 l3proto->nla_policy);
668 ret = l3proto->nlattr_to_tuple(tb, tuple);
676 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
677 [CTA_PROTO_NUM] = { .type = NLA_U8 },
681 ctnetlink_parse_tuple_proto(struct nlattr *attr,
682 struct nf_conntrack_tuple *tuple)
684 struct nlattr *tb[CTA_PROTO_MAX+1];
685 struct nf_conntrack_l4proto *l4proto;
688 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
692 if (!tb[CTA_PROTO_NUM])
694 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
697 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
699 if (likely(l4proto->nlattr_to_tuple)) {
700 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
701 l4proto->nla_policy);
703 ret = l4proto->nlattr_to_tuple(tb, tuple);
712 ctnetlink_parse_tuple(const struct nlattr * const cda[],
713 struct nf_conntrack_tuple *tuple,
714 enum ctattr_tuple type, u_int8_t l3num)
716 struct nlattr *tb[CTA_TUPLE_MAX+1];
719 memset(tuple, 0, sizeof(*tuple));
721 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
723 if (!tb[CTA_TUPLE_IP])
726 tuple->src.l3num = l3num;
728 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
732 if (!tb[CTA_TUPLE_PROTO])
735 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
739 /* orig and expect tuples get DIR_ORIGINAL */
740 if (type == CTA_TUPLE_REPLY)
741 tuple->dst.dir = IP_CT_DIR_REPLY;
743 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
749 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
751 struct nlattr *tb[CTA_HELP_MAX+1];
753 nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
755 if (!tb[CTA_HELP_NAME])
758 *helper_name = nla_data(tb[CTA_HELP_NAME]);
763 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
764 [CTA_STATUS] = { .type = NLA_U32 },
765 [CTA_TIMEOUT] = { .type = NLA_U32 },
766 [CTA_MARK] = { .type = NLA_U32 },
767 [CTA_USE] = { .type = NLA_U32 },
768 [CTA_ID] = { .type = NLA_U32 },
772 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
773 const struct nlmsghdr *nlh,
774 const struct nlattr * const cda[])
776 struct net *net = sock_net(ctnl);
777 struct nf_conntrack_tuple_hash *h;
778 struct nf_conntrack_tuple tuple;
780 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
781 u_int8_t u3 = nfmsg->nfgen_family;
784 if (cda[CTA_TUPLE_ORIG])
785 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
786 else if (cda[CTA_TUPLE_REPLY])
787 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
789 /* Flush the whole table */
790 nf_conntrack_flush_report(net,
799 h = nf_conntrack_find_get(net, &tuple);
803 ct = nf_ct_tuplehash_to_ctrack(h);
806 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
807 if (id != (u32)(unsigned long)ct) {
813 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
815 nlmsg_report(nlh)) < 0) {
816 nf_ct_delete_from_lists(ct);
817 /* we failed to report the event, try later */
818 nf_ct_insert_dying_list(ct);
823 /* death_by_timeout would report the event again */
824 set_bit(IPS_DYING_BIT, &ct->status);
833 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
834 const struct nlmsghdr *nlh,
835 const struct nlattr * const cda[])
837 struct net *net = sock_net(ctnl);
838 struct nf_conntrack_tuple_hash *h;
839 struct nf_conntrack_tuple tuple;
841 struct sk_buff *skb2 = NULL;
842 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
843 u_int8_t u3 = nfmsg->nfgen_family;
846 if (nlh->nlmsg_flags & NLM_F_DUMP)
847 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(net, &tuple);
864 ct = nf_ct_tuplehash_to_ctrack(h);
867 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
874 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
875 IPCTNL_MSG_CT_NEW, ct);
881 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
893 #ifdef CONFIG_NF_NAT_NEEDED
895 ctnetlink_parse_nat_setup(struct nf_conn *ct,
896 enum nf_nat_manip_type manip,
897 const struct nlattr *attr)
899 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
901 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
902 if (!parse_nat_setup) {
903 #ifdef CONFIG_MODULES
905 spin_unlock_bh(&nf_conntrack_lock);
907 if (request_module("nf-nat-ipv4") < 0) {
909 spin_lock_bh(&nf_conntrack_lock);
914 spin_lock_bh(&nf_conntrack_lock);
916 if (nfnetlink_parse_nat_setup_hook)
922 return parse_nat_setup(ct, manip, attr);
927 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
930 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
931 d = ct->status ^ status;
933 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
937 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
938 /* SEEN_REPLY bit can only be set */
941 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
942 /* ASSURED bit can only be set */
945 /* Be careful here, modifying NAT bits can screw up things,
946 * so don't let users modify them directly if they don't pass
948 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
953 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
955 #ifdef CONFIG_NF_NAT_NEEDED
958 if (cda[CTA_NAT_DST]) {
959 ret = ctnetlink_parse_nat_setup(ct,
965 if (cda[CTA_NAT_SRC]) {
966 ret = ctnetlink_parse_nat_setup(ct,
979 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
981 struct nf_conntrack_helper *helper;
982 struct nf_conn_help *help = nfct_help(ct);
983 char *helpname = NULL;
986 /* don't change helper of sibling connections */
990 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
994 if (!strcmp(helpname, "")) {
995 if (help && help->helper) {
996 /* we had a helper before ... */
997 nf_ct_remove_expectations(ct);
998 rcu_assign_pointer(help->helper, NULL);
1004 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1005 nf_ct_protonum(ct));
1006 if (helper == NULL) {
1007 #ifdef CONFIG_MODULES
1008 spin_unlock_bh(&nf_conntrack_lock);
1010 if (request_module("nfct-helper-%s", helpname) < 0) {
1011 spin_lock_bh(&nf_conntrack_lock);
1015 spin_lock_bh(&nf_conntrack_lock);
1016 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1017 nf_ct_protonum(ct));
1025 if (help->helper == helper)
1029 /* need to zero data of old helper */
1030 memset(&help->help, 0, sizeof(help->help));
1032 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1037 rcu_assign_pointer(help->helper, helper);
1043 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1045 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1047 if (!del_timer(&ct->timeout))
1050 ct->timeout.expires = jiffies + timeout * HZ;
1051 add_timer(&ct->timeout);
1057 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1059 const struct nlattr *attr = cda[CTA_PROTOINFO];
1060 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1061 struct nf_conntrack_l4proto *l4proto;
1064 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1067 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1068 if (l4proto->from_nlattr)
1069 err = l4proto->from_nlattr(tb, ct);
1075 #ifdef CONFIG_NF_NAT_NEEDED
1077 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1079 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1081 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1083 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1086 natseq->correction_pos =
1087 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1089 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1092 natseq->offset_before =
1093 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1095 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1098 natseq->offset_after =
1099 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1105 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1106 const struct nlattr * const cda[])
1109 struct nf_conn_nat *nat = nfct_nat(ct);
1114 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1115 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1116 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1120 ct->status |= IPS_SEQ_ADJUST;
1123 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1124 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1125 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1129 ct->status |= IPS_SEQ_ADJUST;
1137 ctnetlink_change_conntrack(struct nf_conn *ct,
1138 const struct nlattr * const cda[])
1142 /* only allow NAT changes and master assignation for new conntracks */
1143 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1146 if (cda[CTA_HELP]) {
1147 err = ctnetlink_change_helper(ct, cda);
1152 if (cda[CTA_TIMEOUT]) {
1153 err = ctnetlink_change_timeout(ct, cda);
1158 if (cda[CTA_STATUS]) {
1159 err = ctnetlink_change_status(ct, cda);
1164 if (cda[CTA_PROTOINFO]) {
1165 err = ctnetlink_change_protoinfo(ct, cda);
1170 #if defined(CONFIG_NF_CONNTRACK_MARK)
1172 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1175 #ifdef CONFIG_NF_NAT_NEEDED
1176 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1177 err = ctnetlink_change_nat_seq_adj(ct, cda);
1186 static struct nf_conn *
1187 ctnetlink_create_conntrack(struct net *net,
1188 const struct nlattr * const cda[],
1189 struct nf_conntrack_tuple *otuple,
1190 struct nf_conntrack_tuple *rtuple,
1195 struct nf_conntrack_helper *helper;
1197 ct = nf_conntrack_alloc(net, otuple, rtuple, GFP_ATOMIC);
1199 return ERR_PTR(-ENOMEM);
1201 if (!cda[CTA_TIMEOUT])
1203 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1205 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1206 ct->status |= IPS_CONFIRMED;
1209 if (cda[CTA_HELP]) {
1210 char *helpname = NULL;
1212 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1216 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1217 nf_ct_protonum(ct));
1218 if (helper == NULL) {
1220 #ifdef CONFIG_MODULES
1221 if (request_module("nfct-helper-%s", helpname) < 0) {
1227 helper = __nf_conntrack_helper_find(helpname,
1229 nf_ct_protonum(ct));
1239 struct nf_conn_help *help;
1241 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1247 /* not in hash table yet so not strictly necessary */
1248 rcu_assign_pointer(help->helper, helper);
1251 /* try an implicit helper assignation */
1252 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1257 if (cda[CTA_STATUS]) {
1258 err = ctnetlink_change_status(ct, cda);
1263 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1264 err = ctnetlink_change_nat(ct, cda);
1269 #ifdef CONFIG_NF_NAT_NEEDED
1270 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1271 err = ctnetlink_change_nat_seq_adj(ct, cda);
1277 if (cda[CTA_PROTOINFO]) {
1278 err = ctnetlink_change_protoinfo(ct, cda);
1283 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1284 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1286 #if defined(CONFIG_NF_CONNTRACK_MARK)
1288 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1291 /* setup master conntrack: this is a confirmed expectation */
1292 if (cda[CTA_TUPLE_MASTER]) {
1293 struct nf_conntrack_tuple master;
1294 struct nf_conntrack_tuple_hash *master_h;
1295 struct nf_conn *master_ct;
1297 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1301 master_h = nf_conntrack_find_get(net, &master);
1302 if (master_h == NULL) {
1306 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1307 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1308 ct->master = master_ct;
1311 add_timer(&ct->timeout);
1312 nf_conntrack_hash_insert(ct);
1320 nf_conntrack_free(ct);
1321 return ERR_PTR(err);
1325 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1326 const struct nlmsghdr *nlh,
1327 const struct nlattr * const cda[])
1329 struct net *net = sock_net(ctnl);
1330 struct nf_conntrack_tuple otuple, rtuple;
1331 struct nf_conntrack_tuple_hash *h = NULL;
1332 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1333 u_int8_t u3 = nfmsg->nfgen_family;
1336 if (cda[CTA_TUPLE_ORIG]) {
1337 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1342 if (cda[CTA_TUPLE_REPLY]) {
1343 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1348 spin_lock_bh(&nf_conntrack_lock);
1349 if (cda[CTA_TUPLE_ORIG])
1350 h = __nf_conntrack_find(net, &otuple);
1351 else if (cda[CTA_TUPLE_REPLY])
1352 h = __nf_conntrack_find(net, &rtuple);
1356 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1358 enum ip_conntrack_events events;
1360 ct = ctnetlink_create_conntrack(net, cda, &otuple,
1367 nf_conntrack_get(&ct->ct_general);
1368 spin_unlock_bh(&nf_conntrack_lock);
1369 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1370 events = IPCT_RELATED;
1374 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1375 (1 << IPCT_ASSURED) |
1376 (1 << IPCT_HELPER) |
1377 (1 << IPCT_PROTOINFO) |
1378 (1 << IPCT_NATSEQADJ) |
1379 (1 << IPCT_MARK) | events,
1380 ct, NETLINK_CB(skb).pid,
1384 spin_unlock_bh(&nf_conntrack_lock);
1388 /* implicit 'else' */
1390 /* We manipulate the conntrack inside the global conntrack table lock,
1391 * so there's no need to increase the refcount */
1393 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1394 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1396 err = ctnetlink_change_conntrack(ct, cda);
1398 nf_conntrack_get(&ct->ct_general);
1399 spin_unlock_bh(&nf_conntrack_lock);
1400 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1401 (1 << IPCT_ASSURED) |
1402 (1 << IPCT_HELPER) |
1403 (1 << IPCT_PROTOINFO) |
1404 (1 << IPCT_NATSEQADJ) |
1406 ct, NETLINK_CB(skb).pid,
1410 spin_unlock_bh(&nf_conntrack_lock);
1416 spin_unlock_bh(&nf_conntrack_lock);
1420 /***********************************************************************
1422 ***********************************************************************/
1425 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1426 const struct nf_conntrack_tuple *tuple,
1427 enum ctattr_expect type)
1429 struct nlattr *nest_parms;
1431 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1433 goto nla_put_failure;
1434 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1435 goto nla_put_failure;
1436 nla_nest_end(skb, nest_parms);
1445 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1446 const struct nf_conntrack_tuple *tuple,
1447 const struct nf_conntrack_tuple_mask *mask)
1450 struct nf_conntrack_l3proto *l3proto;
1451 struct nf_conntrack_l4proto *l4proto;
1452 struct nf_conntrack_tuple m;
1453 struct nlattr *nest_parms;
1455 memset(&m, 0xFF, sizeof(m));
1456 m.src.u.all = mask->src.u.all;
1457 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1459 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1461 goto nla_put_failure;
1463 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1464 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1466 if (unlikely(ret < 0))
1467 goto nla_put_failure;
1469 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1470 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1471 if (unlikely(ret < 0))
1472 goto nla_put_failure;
1474 nla_nest_end(skb, nest_parms);
1483 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1484 const struct nf_conntrack_expect *exp)
1486 struct nf_conn *master = exp->master;
1487 long timeout = (exp->timeout.expires - jiffies) / HZ;
1492 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1493 goto nla_put_failure;
1494 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1495 goto nla_put_failure;
1496 if (ctnetlink_exp_dump_tuple(skb,
1497 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1498 CTA_EXPECT_MASTER) < 0)
1499 goto nla_put_failure;
1501 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1502 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1511 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1512 int event, const struct nf_conntrack_expect *exp)
1514 struct nlmsghdr *nlh;
1515 struct nfgenmsg *nfmsg;
1516 unsigned int flags = pid ? NLM_F_MULTI : 0;
1518 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1519 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1523 nfmsg = nlmsg_data(nlh);
1524 nfmsg->nfgen_family = exp->tuple.src.l3num;
1525 nfmsg->version = NFNETLINK_V0;
1528 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1529 goto nla_put_failure;
1531 nlmsg_end(skb, nlh);
1536 nlmsg_cancel(skb, nlh);
1540 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1542 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1544 struct nf_conntrack_expect *exp = item->exp;
1545 struct net *net = nf_ct_exp_net(exp);
1546 struct nlmsghdr *nlh;
1547 struct nfgenmsg *nfmsg;
1548 struct sk_buff *skb;
1552 if (events & (1 << IPEXP_NEW)) {
1553 type = IPCTNL_MSG_EXP_NEW;
1554 flags = NLM_F_CREATE|NLM_F_EXCL;
1558 if (!item->report &&
1559 !nfnetlink_has_listeners(net, NFNLGRP_CONNTRACK_EXP_NEW))
1562 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1566 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1567 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1571 nfmsg = nlmsg_data(nlh);
1572 nfmsg->nfgen_family = exp->tuple.src.l3num;
1573 nfmsg->version = NFNETLINK_V0;
1577 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1578 goto nla_put_failure;
1581 nlmsg_end(skb, nlh);
1582 nfnetlink_send(skb, net, item->pid, NFNLGRP_CONNTRACK_EXP_NEW,
1583 item->report, GFP_ATOMIC);
1588 nlmsg_cancel(skb, nlh);
1592 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1596 static int ctnetlink_exp_done(struct netlink_callback *cb)
1599 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1604 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1606 struct net *net = sock_net(skb->sk);
1607 struct nf_conntrack_expect *exp, *last;
1608 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1609 struct hlist_node *n;
1610 u_int8_t l3proto = nfmsg->nfgen_family;
1613 last = (struct nf_conntrack_expect *)cb->args[1];
1614 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1616 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1618 if (l3proto && exp->tuple.src.l3num != l3proto)
1625 if (ctnetlink_exp_fill_info(skb,
1626 NETLINK_CB(cb->skb).pid,
1630 if (!atomic_inc_not_zero(&exp->use))
1632 cb->args[1] = (unsigned long)exp;
1644 nf_ct_expect_put(last);
1649 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1650 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1651 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1655 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1656 const struct nlmsghdr *nlh,
1657 const struct nlattr * const cda[])
1659 struct net *net = sock_net(ctnl);
1660 struct nf_conntrack_tuple tuple;
1661 struct nf_conntrack_expect *exp;
1662 struct sk_buff *skb2;
1663 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1664 u_int8_t u3 = nfmsg->nfgen_family;
1667 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1668 return netlink_dump_start(ctnl, skb, nlh,
1669 ctnetlink_exp_dump_table,
1670 ctnetlink_exp_done);
1673 if (cda[CTA_EXPECT_MASTER])
1674 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1681 exp = nf_ct_expect_find_get(net, &tuple);
1685 if (cda[CTA_EXPECT_ID]) {
1686 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1687 if (ntohl(id) != (u32)(unsigned long)exp) {
1688 nf_ct_expect_put(exp);
1694 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1699 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1700 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1705 nf_ct_expect_put(exp);
1707 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1712 nf_ct_expect_put(exp);
1717 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1718 const struct nlmsghdr *nlh,
1719 const struct nlattr * const cda[])
1721 struct net *net = sock_net(ctnl);
1722 struct nf_conntrack_expect *exp;
1723 struct nf_conntrack_tuple tuple;
1724 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1725 struct hlist_node *n, *next;
1726 u_int8_t u3 = nfmsg->nfgen_family;
1730 if (cda[CTA_EXPECT_TUPLE]) {
1731 /* delete a single expect by tuple */
1732 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1736 /* bump usage count to 2 */
1737 exp = nf_ct_expect_find_get(net, &tuple);
1741 if (cda[CTA_EXPECT_ID]) {
1742 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1743 if (ntohl(id) != (u32)(unsigned long)exp) {
1744 nf_ct_expect_put(exp);
1749 /* after list removal, usage count == 1 */
1750 nf_ct_unexpect_related(exp);
1751 /* have to put what we 'get' above.
1752 * after this line usage count == 0 */
1753 nf_ct_expect_put(exp);
1754 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1755 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1756 struct nf_conn_help *m_help;
1758 /* delete all expectations for this helper */
1759 spin_lock_bh(&nf_conntrack_lock);
1760 for (i = 0; i < nf_ct_expect_hsize; i++) {
1761 hlist_for_each_entry_safe(exp, n, next,
1762 &net->ct.expect_hash[i],
1764 m_help = nfct_help(exp->master);
1765 if (!strcmp(m_help->helper->name, name) &&
1766 del_timer(&exp->timeout)) {
1767 nf_ct_unlink_expect(exp);
1768 nf_ct_expect_put(exp);
1772 spin_unlock_bh(&nf_conntrack_lock);
1774 /* This basically means we have to flush everything*/
1775 spin_lock_bh(&nf_conntrack_lock);
1776 for (i = 0; i < nf_ct_expect_hsize; i++) {
1777 hlist_for_each_entry_safe(exp, n, next,
1778 &net->ct.expect_hash[i],
1780 if (del_timer(&exp->timeout)) {
1781 nf_ct_unlink_expect(exp);
1782 nf_ct_expect_put(exp);
1786 spin_unlock_bh(&nf_conntrack_lock);
1792 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1793 const struct nlattr * const cda[])
1799 ctnetlink_create_expect(struct net *net, const struct nlattr * const cda[],
1801 u32 pid, int report)
1803 struct nf_conntrack_tuple tuple, mask, master_tuple;
1804 struct nf_conntrack_tuple_hash *h = NULL;
1805 struct nf_conntrack_expect *exp;
1807 struct nf_conn_help *help;
1810 /* caller guarantees that those three CTA_EXPECT_* exist */
1811 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1814 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1817 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1821 /* Look for master conntrack of this expectation */
1822 h = nf_conntrack_find_get(net, &master_tuple);
1825 ct = nf_ct_tuplehash_to_ctrack(h);
1826 help = nfct_help(ct);
1828 if (!help || !help->helper) {
1829 /* such conntrack hasn't got any helper, abort */
1834 exp = nf_ct_expect_alloc(ct);
1841 exp->expectfn = NULL;
1845 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1846 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1847 exp->mask.src.u.all = mask.src.u.all;
1849 err = nf_ct_expect_related_report(exp, pid, report);
1850 nf_ct_expect_put(exp);
1853 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1858 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1859 const struct nlmsghdr *nlh,
1860 const struct nlattr * const cda[])
1862 struct net *net = sock_net(ctnl);
1863 struct nf_conntrack_tuple tuple;
1864 struct nf_conntrack_expect *exp;
1865 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1866 u_int8_t u3 = nfmsg->nfgen_family;
1869 if (!cda[CTA_EXPECT_TUPLE]
1870 || !cda[CTA_EXPECT_MASK]
1871 || !cda[CTA_EXPECT_MASTER])
1874 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1878 spin_lock_bh(&nf_conntrack_lock);
1879 exp = __nf_ct_expect_find(net, &tuple);
1882 spin_unlock_bh(&nf_conntrack_lock);
1884 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1885 err = ctnetlink_create_expect(net, cda,
1887 NETLINK_CB(skb).pid,
1894 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1895 err = ctnetlink_change_expect(exp, cda);
1896 spin_unlock_bh(&nf_conntrack_lock);
1901 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1902 static struct nf_ct_event_notifier ctnl_notifier = {
1903 .fcn = ctnetlink_conntrack_event,
1906 static struct nf_exp_event_notifier ctnl_notifier_exp = {
1907 .fcn = ctnetlink_expect_event,
1911 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1912 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1913 .attr_count = CTA_MAX,
1914 .policy = ct_nla_policy },
1915 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1916 .attr_count = CTA_MAX,
1917 .policy = ct_nla_policy },
1918 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1919 .attr_count = CTA_MAX,
1920 .policy = ct_nla_policy },
1921 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1922 .attr_count = CTA_MAX,
1923 .policy = ct_nla_policy },
1926 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1927 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1928 .attr_count = CTA_EXPECT_MAX,
1929 .policy = exp_nla_policy },
1930 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1931 .attr_count = CTA_EXPECT_MAX,
1932 .policy = exp_nla_policy },
1933 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1934 .attr_count = CTA_EXPECT_MAX,
1935 .policy = exp_nla_policy },
1938 static const struct nfnetlink_subsystem ctnl_subsys = {
1939 .name = "conntrack",
1940 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1941 .cb_count = IPCTNL_MSG_MAX,
1945 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1946 .name = "conntrack_expect",
1947 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1948 .cb_count = IPCTNL_MSG_EXP_MAX,
1952 MODULE_ALIAS("ip_conntrack_netlink");
1953 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1954 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1956 static int __init ctnetlink_init(void)
1960 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1961 ret = nfnetlink_subsys_register(&ctnl_subsys);
1963 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1967 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1969 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1970 goto err_unreg_subsys;
1973 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1974 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1976 printk("ctnetlink_init: cannot register notifier.\n");
1977 goto err_unreg_exp_subsys;
1980 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1982 printk("ctnetlink_init: cannot expect register notifier.\n");
1983 goto err_unreg_notifier;
1989 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1991 nf_conntrack_unregister_notifier(&ctnl_notifier);
1992 err_unreg_exp_subsys:
1993 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1996 nfnetlink_subsys_unregister(&ctnl_subsys);
2001 static void __exit ctnetlink_exit(void)
2003 printk("ctnetlink: unregistering from nfnetlink.\n");
2005 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2006 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2007 nf_conntrack_unregister_notifier(&ctnl_notifier);
2010 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2011 nfnetlink_subsys_unregister(&ctnl_subsys);
2015 module_init(ctnetlink_init);
2016 module_exit(ctnetlink_exit);