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/security.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
33 #include <linux/netfilter.h>
34 #include <net/netlink.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_core.h>
38 #include <net/netfilter/nf_conntrack_expect.h>
39 #include <net/netfilter/nf_conntrack_helper.h>
40 #include <net/netfilter/nf_conntrack_l3proto.h>
41 #include <net/netfilter/nf_conntrack_l4proto.h>
42 #include <net/netfilter/nf_conntrack_tuple.h>
43 #include <net/netfilter/nf_conntrack_acct.h>
44 #include <net/netfilter/nf_conntrack_zones.h>
45 #include <net/netfilter/nf_conntrack_timestamp.h>
46 #ifdef CONFIG_NF_NAT_NEEDED
47 #include <net/netfilter/nf_nat_core.h>
48 #include <net/netfilter/nf_nat_protocol.h>
51 #include <linux/netfilter/nfnetlink.h>
52 #include <linux/netfilter/nfnetlink_conntrack.h>
54 MODULE_LICENSE("GPL");
56 static char __initdata version[] = "0.93";
59 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
60 const struct nf_conntrack_tuple *tuple,
61 struct nf_conntrack_l4proto *l4proto)
64 struct nlattr *nest_parms;
66 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
69 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
71 if (likely(l4proto->tuple_to_nlattr))
72 ret = l4proto->tuple_to_nlattr(skb, tuple);
74 nla_nest_end(skb, nest_parms);
83 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
84 const struct nf_conntrack_tuple *tuple,
85 struct nf_conntrack_l3proto *l3proto)
88 struct nlattr *nest_parms;
90 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
94 if (likely(l3proto->tuple_to_nlattr))
95 ret = l3proto->tuple_to_nlattr(skb, tuple);
97 nla_nest_end(skb, nest_parms);
106 ctnetlink_dump_tuples(struct sk_buff *skb,
107 const struct nf_conntrack_tuple *tuple)
110 struct nf_conntrack_l3proto *l3proto;
111 struct nf_conntrack_l4proto *l4proto;
113 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
114 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
116 if (unlikely(ret < 0))
119 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
120 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
126 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
128 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
136 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
138 long timeout = (ct->timeout.expires - jiffies) / HZ;
143 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
151 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
153 struct nf_conntrack_l4proto *l4proto;
154 struct nlattr *nest_proto;
157 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
158 if (!l4proto->to_nlattr)
161 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
163 goto nla_put_failure;
165 ret = l4proto->to_nlattr(skb, nest_proto, ct);
167 nla_nest_end(skb, nest_proto);
176 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
178 struct nlattr *nest_helper;
179 const struct nf_conn_help *help = nfct_help(ct);
180 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);
206 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
207 enum ip_conntrack_dir dir)
209 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
210 struct nlattr *nest_count;
211 const struct nf_conn_counter *acct;
213 acct = nf_conn_acct_find(ct);
217 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
219 goto nla_put_failure;
221 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
222 cpu_to_be64(acct[dir].packets));
223 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
224 cpu_to_be64(acct[dir].bytes));
226 nla_nest_end(skb, nest_count);
235 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
237 struct nlattr *nest_count;
238 const struct nf_conn_tstamp *tstamp;
240 tstamp = nf_conn_tstamp_find(ct);
244 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
246 goto nla_put_failure;
248 NLA_PUT_BE64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start));
249 if (tstamp->stop != 0) {
250 NLA_PUT_BE64(skb, CTA_TIMESTAMP_STOP,
251 cpu_to_be64(tstamp->stop));
253 nla_nest_end(skb, nest_count);
261 #ifdef CONFIG_NF_CONNTRACK_MARK
263 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
265 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
272 #define ctnetlink_dump_mark(a, b) (0)
275 #ifdef CONFIG_NF_CONNTRACK_SECMARK
277 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
279 struct nlattr *nest_secctx;
283 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
288 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
290 goto nla_put_failure;
292 NLA_PUT_STRING(skb, CTA_SECCTX_NAME, secctx);
293 nla_nest_end(skb, nest_secctx);
297 security_release_secctx(secctx, len);
301 #define ctnetlink_dump_secctx(a, b) (0)
304 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
307 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
309 struct nlattr *nest_parms;
311 if (!(ct->status & IPS_EXPECTED))
314 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
316 goto nla_put_failure;
317 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
318 goto nla_put_failure;
319 nla_nest_end(skb, nest_parms);
327 #ifdef CONFIG_NF_NAT_NEEDED
329 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
331 struct nlattr *nest_parms;
333 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
335 goto nla_put_failure;
337 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
338 htonl(natseq->correction_pos));
339 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
340 htonl(natseq->offset_before));
341 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
342 htonl(natseq->offset_after));
344 nla_nest_end(skb, nest_parms);
353 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
355 struct nf_nat_seq *natseq;
356 struct nf_conn_nat *nat = nfct_nat(ct);
358 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
361 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
362 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
365 natseq = &nat->seq[IP_CT_DIR_REPLY];
366 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
372 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
376 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
378 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
386 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
388 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
396 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
397 int event, struct nf_conn *ct)
399 struct nlmsghdr *nlh;
400 struct nfgenmsg *nfmsg;
401 struct nlattr *nest_parms;
402 unsigned int flags = pid ? NLM_F_MULTI : 0;
404 event |= NFNL_SUBSYS_CTNETLINK << 8;
405 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
409 nfmsg = nlmsg_data(nlh);
410 nfmsg->nfgen_family = nf_ct_l3num(ct);
411 nfmsg->version = NFNETLINK_V0;
414 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
416 goto nla_put_failure;
417 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
418 goto nla_put_failure;
419 nla_nest_end(skb, nest_parms);
421 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
423 goto nla_put_failure;
424 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
425 goto nla_put_failure;
426 nla_nest_end(skb, nest_parms);
429 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
431 if (ctnetlink_dump_status(skb, ct) < 0 ||
432 ctnetlink_dump_timeout(skb, ct) < 0 ||
433 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
434 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
435 ctnetlink_dump_timestamp(skb, ct) < 0 ||
436 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
437 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
438 ctnetlink_dump_mark(skb, ct) < 0 ||
439 ctnetlink_dump_secctx(skb, ct) < 0 ||
440 ctnetlink_dump_id(skb, ct) < 0 ||
441 ctnetlink_dump_use(skb, ct) < 0 ||
442 ctnetlink_dump_master(skb, ct) < 0 ||
443 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
444 goto nla_put_failure;
451 nlmsg_cancel(skb, nlh);
455 #ifdef CONFIG_NF_CONNTRACK_EVENTS
457 ctnetlink_proto_size(const struct nf_conn *ct)
459 struct nf_conntrack_l3proto *l3proto;
460 struct nf_conntrack_l4proto *l4proto;
464 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
465 len += l3proto->nla_size;
467 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
468 len += l4proto->nla_size;
475 ctnetlink_counters_size(const struct nf_conn *ct)
477 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
479 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
480 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
481 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
486 ctnetlink_secctx_size(const struct nf_conn *ct)
488 #ifdef CONFIG_NF_CONNTRACK_SECMARK
491 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
495 return nla_total_size(0) /* CTA_SECCTX */
496 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
503 ctnetlink_timestamp_size(const struct nf_conn *ct)
505 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
506 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
508 return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
515 ctnetlink_nlmsg_size(const struct nf_conn *ct)
517 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
518 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
519 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
520 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
521 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
522 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
523 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
524 + ctnetlink_counters_size(ct)
525 + ctnetlink_timestamp_size(ct)
526 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
527 + nla_total_size(0) /* CTA_PROTOINFO */
528 + nla_total_size(0) /* CTA_HELP */
529 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
530 + ctnetlink_secctx_size(ct)
531 #ifdef CONFIG_NF_NAT_NEEDED
532 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
533 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
535 #ifdef CONFIG_NF_CONNTRACK_MARK
536 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
538 + ctnetlink_proto_size(ct)
543 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
546 struct nlmsghdr *nlh;
547 struct nfgenmsg *nfmsg;
548 struct nlattr *nest_parms;
549 struct nf_conn *ct = item->ct;
552 unsigned int flags = 0, group;
555 /* ignore our fake conntrack entry */
556 if (nf_ct_is_untracked(ct))
559 if (events & (1 << IPCT_DESTROY)) {
560 type = IPCTNL_MSG_CT_DELETE;
561 group = NFNLGRP_CONNTRACK_DESTROY;
562 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
563 type = IPCTNL_MSG_CT_NEW;
564 flags = NLM_F_CREATE|NLM_F_EXCL;
565 group = NFNLGRP_CONNTRACK_NEW;
567 type = IPCTNL_MSG_CT_NEW;
568 group = NFNLGRP_CONNTRACK_UPDATE;
573 if (!item->report && !nfnetlink_has_listeners(net, group))
576 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
580 type |= NFNL_SUBSYS_CTNETLINK << 8;
581 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
585 nfmsg = nlmsg_data(nlh);
586 nfmsg->nfgen_family = nf_ct_l3num(ct);
587 nfmsg->version = NFNETLINK_V0;
591 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
593 goto nla_put_failure;
594 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
595 goto nla_put_failure;
596 nla_nest_end(skb, nest_parms);
598 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
600 goto nla_put_failure;
601 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
602 goto nla_put_failure;
603 nla_nest_end(skb, nest_parms);
606 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
608 if (ctnetlink_dump_id(skb, ct) < 0)
609 goto nla_put_failure;
611 if (ctnetlink_dump_status(skb, ct) < 0)
612 goto nla_put_failure;
614 if (events & (1 << IPCT_DESTROY)) {
615 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
616 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
617 ctnetlink_dump_timestamp(skb, ct) < 0)
618 goto nla_put_failure;
620 if (ctnetlink_dump_timeout(skb, ct) < 0)
621 goto nla_put_failure;
623 if (events & (1 << IPCT_PROTOINFO)
624 && ctnetlink_dump_protoinfo(skb, ct) < 0)
625 goto nla_put_failure;
627 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
628 && ctnetlink_dump_helpinfo(skb, ct) < 0)
629 goto nla_put_failure;
631 #ifdef CONFIG_NF_CONNTRACK_SECMARK
632 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
633 && ctnetlink_dump_secctx(skb, ct) < 0)
634 goto nla_put_failure;
637 if (events & (1 << IPCT_RELATED) &&
638 ctnetlink_dump_master(skb, ct) < 0)
639 goto nla_put_failure;
641 if (events & (1 << IPCT_NATSEQADJ) &&
642 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
643 goto nla_put_failure;
646 #ifdef CONFIG_NF_CONNTRACK_MARK
647 if ((events & (1 << IPCT_MARK) || ct->mark)
648 && ctnetlink_dump_mark(skb, ct) < 0)
649 goto nla_put_failure;
654 err = nfnetlink_send(skb, net, item->pid, group, item->report,
656 if (err == -ENOBUFS || err == -EAGAIN)
663 nlmsg_cancel(skb, nlh);
667 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
672 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
674 static int ctnetlink_done(struct netlink_callback *cb)
677 nf_ct_put((struct nf_conn *)cb->args[1]);
682 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
684 struct net *net = sock_net(skb->sk);
685 struct nf_conn *ct, *last;
686 struct nf_conntrack_tuple_hash *h;
687 struct hlist_nulls_node *n;
688 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
689 u_int8_t l3proto = nfmsg->nfgen_family;
691 spin_lock_bh(&nf_conntrack_lock);
692 last = (struct nf_conn *)cb->args[1];
693 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
695 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
697 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
699 ct = nf_ct_tuplehash_to_ctrack(h);
700 /* Dump entries of a given L3 protocol number.
701 * If it is not specified, ie. l3proto == 0,
702 * then dump everything. */
703 if (l3proto && nf_ct_l3num(ct) != l3proto)
710 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
712 IPCTNL_MSG_CT_NEW, ct) < 0) {
713 cb->args[1] = (unsigned long)ct;
717 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
718 IPCTNL_MSG_CT_GET_CTRZERO) {
719 struct nf_conn_counter *acct;
721 acct = nf_conn_acct_find(ct);
723 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
732 spin_unlock_bh(&nf_conntrack_lock);
740 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
742 struct nlattr *tb[CTA_IP_MAX+1];
743 struct nf_conntrack_l3proto *l3proto;
746 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
749 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
751 if (likely(l3proto->nlattr_to_tuple)) {
752 ret = nla_validate_nested(attr, CTA_IP_MAX,
753 l3proto->nla_policy);
755 ret = l3proto->nlattr_to_tuple(tb, tuple);
763 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
764 [CTA_PROTO_NUM] = { .type = NLA_U8 },
768 ctnetlink_parse_tuple_proto(struct nlattr *attr,
769 struct nf_conntrack_tuple *tuple)
771 struct nlattr *tb[CTA_PROTO_MAX+1];
772 struct nf_conntrack_l4proto *l4proto;
775 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
779 if (!tb[CTA_PROTO_NUM])
781 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
784 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
786 if (likely(l4proto->nlattr_to_tuple)) {
787 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
788 l4proto->nla_policy);
790 ret = l4proto->nlattr_to_tuple(tb, tuple);
798 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
799 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
800 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
804 ctnetlink_parse_tuple(const struct nlattr * const cda[],
805 struct nf_conntrack_tuple *tuple,
806 enum ctattr_type type, u_int8_t l3num)
808 struct nlattr *tb[CTA_TUPLE_MAX+1];
811 memset(tuple, 0, sizeof(*tuple));
813 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
815 if (!tb[CTA_TUPLE_IP])
818 tuple->src.l3num = l3num;
820 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
824 if (!tb[CTA_TUPLE_PROTO])
827 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
831 /* orig and expect tuples get DIR_ORIGINAL */
832 if (type == CTA_TUPLE_REPLY)
833 tuple->dst.dir = IP_CT_DIR_REPLY;
835 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
841 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
844 #ifdef CONFIG_NF_CONNTRACK_ZONES
845 *zone = ntohs(nla_get_be16(attr));
855 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
856 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
860 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
862 struct nlattr *tb[CTA_HELP_MAX+1];
864 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
866 if (!tb[CTA_HELP_NAME])
869 *helper_name = nla_data(tb[CTA_HELP_NAME]);
874 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
875 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
876 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
877 [CTA_STATUS] = { .type = NLA_U32 },
878 [CTA_PROTOINFO] = { .type = NLA_NESTED },
879 [CTA_HELP] = { .type = NLA_NESTED },
880 [CTA_NAT_SRC] = { .type = NLA_NESTED },
881 [CTA_TIMEOUT] = { .type = NLA_U32 },
882 [CTA_MARK] = { .type = NLA_U32 },
883 [CTA_ID] = { .type = NLA_U32 },
884 [CTA_NAT_DST] = { .type = NLA_NESTED },
885 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
886 [CTA_ZONE] = { .type = NLA_U16 },
890 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
891 const struct nlmsghdr *nlh,
892 const struct nlattr * const cda[])
894 struct net *net = sock_net(ctnl);
895 struct nf_conntrack_tuple_hash *h;
896 struct nf_conntrack_tuple tuple;
898 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
899 u_int8_t u3 = nfmsg->nfgen_family;
903 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
907 if (cda[CTA_TUPLE_ORIG])
908 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
909 else if (cda[CTA_TUPLE_REPLY])
910 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
912 /* Flush the whole table */
913 nf_conntrack_flush_report(net,
922 h = nf_conntrack_find_get(net, zone, &tuple);
926 ct = nf_ct_tuplehash_to_ctrack(h);
929 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
930 if (id != (u32)(unsigned long)ct) {
936 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
938 nlmsg_report(nlh)) < 0) {
939 nf_ct_delete_from_lists(ct);
940 /* we failed to report the event, try later */
941 nf_ct_insert_dying_list(ct);
946 /* death_by_timeout would report the event again */
947 set_bit(IPS_DYING_BIT, &ct->status);
956 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
957 const struct nlmsghdr *nlh,
958 const struct nlattr * const cda[])
960 struct net *net = sock_net(ctnl);
961 struct nf_conntrack_tuple_hash *h;
962 struct nf_conntrack_tuple tuple;
964 struct sk_buff *skb2 = NULL;
965 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
966 u_int8_t u3 = nfmsg->nfgen_family;
970 if (nlh->nlmsg_flags & NLM_F_DUMP)
971 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
974 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
978 if (cda[CTA_TUPLE_ORIG])
979 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
980 else if (cda[CTA_TUPLE_REPLY])
981 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
988 h = nf_conntrack_find_get(net, zone, &tuple);
992 ct = nf_ct_tuplehash_to_ctrack(h);
995 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1002 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
1003 IPCTNL_MSG_CT_NEW, ct);
1009 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1018 /* this avoids a loop in nfnetlink. */
1019 return err == -EAGAIN ? -ENOBUFS : err;
1022 #ifdef CONFIG_NF_NAT_NEEDED
1024 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1025 enum nf_nat_manip_type manip,
1026 const struct nlattr *attr)
1028 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1030 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1031 if (!parse_nat_setup) {
1032 #ifdef CONFIG_MODULES
1034 spin_unlock_bh(&nf_conntrack_lock);
1036 if (request_module("nf-nat-ipv4") < 0) {
1038 spin_lock_bh(&nf_conntrack_lock);
1043 spin_lock_bh(&nf_conntrack_lock);
1045 if (nfnetlink_parse_nat_setup_hook)
1051 return parse_nat_setup(ct, manip, attr);
1056 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1059 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1060 d = ct->status ^ status;
1062 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1066 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1067 /* SEEN_REPLY bit can only be set */
1070 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1071 /* ASSURED bit can only be set */
1074 /* Be careful here, modifying NAT bits can screw up things,
1075 * so don't let users modify them directly if they don't pass
1077 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1082 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1084 #ifdef CONFIG_NF_NAT_NEEDED
1087 if (cda[CTA_NAT_DST]) {
1088 ret = ctnetlink_parse_nat_setup(ct,
1094 if (cda[CTA_NAT_SRC]) {
1095 ret = ctnetlink_parse_nat_setup(ct,
1108 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1110 struct nf_conntrack_helper *helper;
1111 struct nf_conn_help *help = nfct_help(ct);
1112 char *helpname = NULL;
1115 /* don't change helper of sibling connections */
1119 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1123 if (!strcmp(helpname, "")) {
1124 if (help && help->helper) {
1125 /* we had a helper before ... */
1126 nf_ct_remove_expectations(ct);
1127 rcu_assign_pointer(help->helper, NULL);
1133 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1134 nf_ct_protonum(ct));
1135 if (helper == NULL) {
1136 #ifdef CONFIG_MODULES
1137 spin_unlock_bh(&nf_conntrack_lock);
1139 if (request_module("nfct-helper-%s", helpname) < 0) {
1140 spin_lock_bh(&nf_conntrack_lock);
1144 spin_lock_bh(&nf_conntrack_lock);
1145 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1146 nf_ct_protonum(ct));
1154 if (help->helper == helper)
1158 /* need to zero data of old helper */
1159 memset(&help->help, 0, sizeof(help->help));
1161 /* we cannot set a helper for an existing conntrack */
1165 rcu_assign_pointer(help->helper, helper);
1171 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1173 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1175 if (!del_timer(&ct->timeout))
1178 ct->timeout.expires = jiffies + timeout * HZ;
1179 add_timer(&ct->timeout);
1184 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1185 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1186 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1187 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1191 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1193 const struct nlattr *attr = cda[CTA_PROTOINFO];
1194 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1195 struct nf_conntrack_l4proto *l4proto;
1198 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1201 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1202 if (l4proto->from_nlattr)
1203 err = l4proto->from_nlattr(tb, ct);
1209 #ifdef CONFIG_NF_NAT_NEEDED
1210 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1211 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1212 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1213 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1217 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1219 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1221 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1223 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1226 natseq->correction_pos =
1227 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1229 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1232 natseq->offset_before =
1233 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1235 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1238 natseq->offset_after =
1239 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1245 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1246 const struct nlattr * const cda[])
1249 struct nf_conn_nat *nat = nfct_nat(ct);
1254 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1255 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1256 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1260 ct->status |= IPS_SEQ_ADJUST;
1263 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1264 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1265 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1269 ct->status |= IPS_SEQ_ADJUST;
1277 ctnetlink_change_conntrack(struct nf_conn *ct,
1278 const struct nlattr * const cda[])
1282 /* only allow NAT changes and master assignation for new conntracks */
1283 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1286 if (cda[CTA_HELP]) {
1287 err = ctnetlink_change_helper(ct, cda);
1292 if (cda[CTA_TIMEOUT]) {
1293 err = ctnetlink_change_timeout(ct, cda);
1298 if (cda[CTA_STATUS]) {
1299 err = ctnetlink_change_status(ct, cda);
1304 if (cda[CTA_PROTOINFO]) {
1305 err = ctnetlink_change_protoinfo(ct, cda);
1310 #if defined(CONFIG_NF_CONNTRACK_MARK)
1312 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1315 #ifdef CONFIG_NF_NAT_NEEDED
1316 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1317 err = ctnetlink_change_nat_seq_adj(ct, cda);
1326 static struct nf_conn *
1327 ctnetlink_create_conntrack(struct net *net, u16 zone,
1328 const struct nlattr * const cda[],
1329 struct nf_conntrack_tuple *otuple,
1330 struct nf_conntrack_tuple *rtuple,
1335 struct nf_conntrack_helper *helper;
1337 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1339 return ERR_PTR(-ENOMEM);
1341 if (!cda[CTA_TIMEOUT])
1343 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1345 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1348 if (cda[CTA_HELP]) {
1349 char *helpname = NULL;
1351 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1355 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1356 nf_ct_protonum(ct));
1357 if (helper == NULL) {
1359 #ifdef CONFIG_MODULES
1360 if (request_module("nfct-helper-%s", helpname) < 0) {
1366 helper = __nf_conntrack_helper_find(helpname,
1368 nf_ct_protonum(ct));
1378 struct nf_conn_help *help;
1380 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1386 /* not in hash table yet so not strictly necessary */
1387 rcu_assign_pointer(help->helper, helper);
1390 /* try an implicit helper assignation */
1391 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1396 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1397 err = ctnetlink_change_nat(ct, cda);
1402 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1403 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1404 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1405 /* we must add conntrack extensions before confirmation. */
1406 ct->status |= IPS_CONFIRMED;
1408 if (cda[CTA_STATUS]) {
1409 err = ctnetlink_change_status(ct, cda);
1414 #ifdef CONFIG_NF_NAT_NEEDED
1415 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1416 err = ctnetlink_change_nat_seq_adj(ct, cda);
1422 memset(&ct->proto, 0, sizeof(ct->proto));
1423 if (cda[CTA_PROTOINFO]) {
1424 err = ctnetlink_change_protoinfo(ct, cda);
1429 #if defined(CONFIG_NF_CONNTRACK_MARK)
1431 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1434 /* setup master conntrack: this is a confirmed expectation */
1435 if (cda[CTA_TUPLE_MASTER]) {
1436 struct nf_conntrack_tuple master;
1437 struct nf_conntrack_tuple_hash *master_h;
1438 struct nf_conn *master_ct;
1440 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1444 master_h = nf_conntrack_find_get(net, zone, &master);
1445 if (master_h == NULL) {
1449 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1450 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1451 ct->master = master_ct;
1454 add_timer(&ct->timeout);
1455 nf_conntrack_hash_insert(ct);
1463 nf_conntrack_free(ct);
1464 return ERR_PTR(err);
1468 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1469 const struct nlmsghdr *nlh,
1470 const struct nlattr * const cda[])
1472 struct net *net = sock_net(ctnl);
1473 struct nf_conntrack_tuple otuple, rtuple;
1474 struct nf_conntrack_tuple_hash *h = NULL;
1475 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1476 u_int8_t u3 = nfmsg->nfgen_family;
1480 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1484 if (cda[CTA_TUPLE_ORIG]) {
1485 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1490 if (cda[CTA_TUPLE_REPLY]) {
1491 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1496 spin_lock_bh(&nf_conntrack_lock);
1497 if (cda[CTA_TUPLE_ORIG])
1498 h = __nf_conntrack_find(net, zone, &otuple);
1499 else if (cda[CTA_TUPLE_REPLY])
1500 h = __nf_conntrack_find(net, zone, &rtuple);
1504 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1506 enum ip_conntrack_events events;
1508 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1515 nf_conntrack_get(&ct->ct_general);
1516 spin_unlock_bh(&nf_conntrack_lock);
1517 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1518 events = IPCT_RELATED;
1522 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1523 (1 << IPCT_ASSURED) |
1524 (1 << IPCT_HELPER) |
1525 (1 << IPCT_PROTOINFO) |
1526 (1 << IPCT_NATSEQADJ) |
1527 (1 << IPCT_MARK) | events,
1528 ct, NETLINK_CB(skb).pid,
1532 spin_unlock_bh(&nf_conntrack_lock);
1536 /* implicit 'else' */
1538 /* We manipulate the conntrack inside the global conntrack table lock,
1539 * so there's no need to increase the refcount */
1541 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1542 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1544 err = ctnetlink_change_conntrack(ct, cda);
1546 nf_conntrack_get(&ct->ct_general);
1547 spin_unlock_bh(&nf_conntrack_lock);
1548 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1549 (1 << IPCT_ASSURED) |
1550 (1 << IPCT_HELPER) |
1551 (1 << IPCT_PROTOINFO) |
1552 (1 << IPCT_NATSEQADJ) |
1554 ct, NETLINK_CB(skb).pid,
1558 spin_unlock_bh(&nf_conntrack_lock);
1564 spin_unlock_bh(&nf_conntrack_lock);
1568 /***********************************************************************
1570 ***********************************************************************/
1573 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1574 const struct nf_conntrack_tuple *tuple,
1575 enum ctattr_expect type)
1577 struct nlattr *nest_parms;
1579 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1581 goto nla_put_failure;
1582 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1583 goto nla_put_failure;
1584 nla_nest_end(skb, nest_parms);
1593 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1594 const struct nf_conntrack_tuple *tuple,
1595 const struct nf_conntrack_tuple_mask *mask)
1598 struct nf_conntrack_l3proto *l3proto;
1599 struct nf_conntrack_l4proto *l4proto;
1600 struct nf_conntrack_tuple m;
1601 struct nlattr *nest_parms;
1603 memset(&m, 0xFF, sizeof(m));
1604 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1605 m.src.u.all = mask->src.u.all;
1606 m.dst.protonum = tuple->dst.protonum;
1608 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1610 goto nla_put_failure;
1612 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1613 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1615 if (unlikely(ret < 0))
1616 goto nla_put_failure;
1618 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1619 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1620 if (unlikely(ret < 0))
1621 goto nla_put_failure;
1623 nla_nest_end(skb, nest_parms);
1632 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1633 const struct nf_conntrack_expect *exp)
1635 struct nf_conn *master = exp->master;
1636 long timeout = (exp->timeout.expires - jiffies) / HZ;
1637 struct nf_conn_help *help;
1642 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1643 goto nla_put_failure;
1644 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1645 goto nla_put_failure;
1646 if (ctnetlink_exp_dump_tuple(skb,
1647 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1648 CTA_EXPECT_MASTER) < 0)
1649 goto nla_put_failure;
1651 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1652 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1653 NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1654 help = nfct_help(master);
1656 struct nf_conntrack_helper *helper;
1658 helper = rcu_dereference(help->helper);
1660 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1670 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1671 int event, const struct nf_conntrack_expect *exp)
1673 struct nlmsghdr *nlh;
1674 struct nfgenmsg *nfmsg;
1675 unsigned int flags = pid ? NLM_F_MULTI : 0;
1677 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1678 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1682 nfmsg = nlmsg_data(nlh);
1683 nfmsg->nfgen_family = exp->tuple.src.l3num;
1684 nfmsg->version = NFNETLINK_V0;
1687 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1688 goto nla_put_failure;
1690 nlmsg_end(skb, nlh);
1695 nlmsg_cancel(skb, nlh);
1699 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1701 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1703 struct nf_conntrack_expect *exp = item->exp;
1704 struct net *net = nf_ct_exp_net(exp);
1705 struct nlmsghdr *nlh;
1706 struct nfgenmsg *nfmsg;
1707 struct sk_buff *skb;
1708 unsigned int type, group;
1711 if (events & (1 << IPEXP_DESTROY)) {
1712 type = IPCTNL_MSG_EXP_DELETE;
1713 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1714 } else if (events & (1 << IPEXP_NEW)) {
1715 type = IPCTNL_MSG_EXP_NEW;
1716 flags = NLM_F_CREATE|NLM_F_EXCL;
1717 group = NFNLGRP_CONNTRACK_EXP_NEW;
1721 if (!item->report && !nfnetlink_has_listeners(net, group))
1724 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1728 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1729 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1733 nfmsg = nlmsg_data(nlh);
1734 nfmsg->nfgen_family = exp->tuple.src.l3num;
1735 nfmsg->version = NFNETLINK_V0;
1739 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1740 goto nla_put_failure;
1743 nlmsg_end(skb, nlh);
1744 nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1749 nlmsg_cancel(skb, nlh);
1753 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1757 static int ctnetlink_exp_done(struct netlink_callback *cb)
1760 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1765 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1767 struct net *net = sock_net(skb->sk);
1768 struct nf_conntrack_expect *exp, *last;
1769 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1770 struct hlist_node *n;
1771 u_int8_t l3proto = nfmsg->nfgen_family;
1774 last = (struct nf_conntrack_expect *)cb->args[1];
1775 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1777 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1779 if (l3proto && exp->tuple.src.l3num != l3proto)
1786 if (ctnetlink_exp_fill_info(skb,
1787 NETLINK_CB(cb->skb).pid,
1791 if (!atomic_inc_not_zero(&exp->use))
1793 cb->args[1] = (unsigned long)exp;
1805 nf_ct_expect_put(last);
1810 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1811 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1812 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1813 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1814 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1815 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1816 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1817 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
1818 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
1822 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1823 const struct nlmsghdr *nlh,
1824 const struct nlattr * const cda[])
1826 struct net *net = sock_net(ctnl);
1827 struct nf_conntrack_tuple tuple;
1828 struct nf_conntrack_expect *exp;
1829 struct sk_buff *skb2;
1830 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1831 u_int8_t u3 = nfmsg->nfgen_family;
1835 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1836 return netlink_dump_start(ctnl, skb, nlh,
1837 ctnetlink_exp_dump_table,
1838 ctnetlink_exp_done);
1841 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1845 if (cda[CTA_EXPECT_MASTER])
1846 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1853 exp = nf_ct_expect_find_get(net, zone, &tuple);
1857 if (cda[CTA_EXPECT_ID]) {
1858 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1859 if (ntohl(id) != (u32)(unsigned long)exp) {
1860 nf_ct_expect_put(exp);
1866 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1871 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1872 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1877 nf_ct_expect_put(exp);
1879 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1884 nf_ct_expect_put(exp);
1889 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1890 const struct nlmsghdr *nlh,
1891 const struct nlattr * const cda[])
1893 struct net *net = sock_net(ctnl);
1894 struct nf_conntrack_expect *exp;
1895 struct nf_conntrack_tuple tuple;
1896 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1897 struct hlist_node *n, *next;
1898 u_int8_t u3 = nfmsg->nfgen_family;
1903 if (cda[CTA_EXPECT_TUPLE]) {
1904 /* delete a single expect by tuple */
1905 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1909 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1913 /* bump usage count to 2 */
1914 exp = nf_ct_expect_find_get(net, zone, &tuple);
1918 if (cda[CTA_EXPECT_ID]) {
1919 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1920 if (ntohl(id) != (u32)(unsigned long)exp) {
1921 nf_ct_expect_put(exp);
1926 /* after list removal, usage count == 1 */
1927 spin_lock_bh(&nf_conntrack_lock);
1928 if (del_timer(&exp->timeout)) {
1929 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1931 nf_ct_expect_put(exp);
1933 spin_unlock_bh(&nf_conntrack_lock);
1934 /* have to put what we 'get' above.
1935 * after this line usage count == 0 */
1936 nf_ct_expect_put(exp);
1937 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1938 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1939 struct nf_conn_help *m_help;
1941 /* delete all expectations for this helper */
1942 spin_lock_bh(&nf_conntrack_lock);
1943 for (i = 0; i < nf_ct_expect_hsize; i++) {
1944 hlist_for_each_entry_safe(exp, n, next,
1945 &net->ct.expect_hash[i],
1947 m_help = nfct_help(exp->master);
1948 if (!strcmp(m_help->helper->name, name) &&
1949 del_timer(&exp->timeout)) {
1950 nf_ct_unlink_expect_report(exp,
1951 NETLINK_CB(skb).pid,
1953 nf_ct_expect_put(exp);
1957 spin_unlock_bh(&nf_conntrack_lock);
1959 /* This basically means we have to flush everything*/
1960 spin_lock_bh(&nf_conntrack_lock);
1961 for (i = 0; i < nf_ct_expect_hsize; i++) {
1962 hlist_for_each_entry_safe(exp, n, next,
1963 &net->ct.expect_hash[i],
1965 if (del_timer(&exp->timeout)) {
1966 nf_ct_unlink_expect_report(exp,
1967 NETLINK_CB(skb).pid,
1969 nf_ct_expect_put(exp);
1973 spin_unlock_bh(&nf_conntrack_lock);
1979 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1980 const struct nlattr * const cda[])
1986 ctnetlink_create_expect(struct net *net, u16 zone,
1987 const struct nlattr * const cda[],
1989 u32 pid, int report)
1991 struct nf_conntrack_tuple tuple, mask, master_tuple;
1992 struct nf_conntrack_tuple_hash *h = NULL;
1993 struct nf_conntrack_expect *exp;
1995 struct nf_conn_help *help;
1998 /* caller guarantees that those three CTA_EXPECT_* exist */
1999 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2002 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2005 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2009 /* Look for master conntrack of this expectation */
2010 h = nf_conntrack_find_get(net, zone, &master_tuple);
2013 ct = nf_ct_tuplehash_to_ctrack(h);
2014 exp = nf_ct_expect_alloc(ct);
2019 help = nfct_help(ct);
2021 if (!cda[CTA_EXPECT_TIMEOUT]) {
2025 exp->timeout.expires =
2026 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2028 exp->flags = NF_CT_EXPECT_USERSPACE;
2029 if (cda[CTA_EXPECT_FLAGS]) {
2031 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2034 if (cda[CTA_EXPECT_FLAGS]) {
2035 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2036 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2042 exp->expectfn = NULL;
2045 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2046 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2047 exp->mask.src.u.all = mask.src.u.all;
2049 err = nf_ct_expect_related_report(exp, pid, report);
2050 nf_ct_expect_put(exp);
2053 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2058 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2059 const struct nlmsghdr *nlh,
2060 const struct nlattr * const cda[])
2062 struct net *net = sock_net(ctnl);
2063 struct nf_conntrack_tuple tuple;
2064 struct nf_conntrack_expect *exp;
2065 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2066 u_int8_t u3 = nfmsg->nfgen_family;
2070 if (!cda[CTA_EXPECT_TUPLE]
2071 || !cda[CTA_EXPECT_MASK]
2072 || !cda[CTA_EXPECT_MASTER])
2075 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2079 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2083 spin_lock_bh(&nf_conntrack_lock);
2084 exp = __nf_ct_expect_find(net, zone, &tuple);
2087 spin_unlock_bh(&nf_conntrack_lock);
2089 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2090 err = ctnetlink_create_expect(net, zone, cda,
2092 NETLINK_CB(skb).pid,
2099 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2100 err = ctnetlink_change_expect(exp, cda);
2101 spin_unlock_bh(&nf_conntrack_lock);
2106 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2107 static struct nf_ct_event_notifier ctnl_notifier = {
2108 .fcn = ctnetlink_conntrack_event,
2111 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2112 .fcn = ctnetlink_expect_event,
2116 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2117 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2118 .attr_count = CTA_MAX,
2119 .policy = ct_nla_policy },
2120 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2121 .attr_count = CTA_MAX,
2122 .policy = ct_nla_policy },
2123 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2124 .attr_count = CTA_MAX,
2125 .policy = ct_nla_policy },
2126 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2127 .attr_count = CTA_MAX,
2128 .policy = ct_nla_policy },
2131 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2132 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2133 .attr_count = CTA_EXPECT_MAX,
2134 .policy = exp_nla_policy },
2135 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2136 .attr_count = CTA_EXPECT_MAX,
2137 .policy = exp_nla_policy },
2138 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2139 .attr_count = CTA_EXPECT_MAX,
2140 .policy = exp_nla_policy },
2143 static const struct nfnetlink_subsystem ctnl_subsys = {
2144 .name = "conntrack",
2145 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2146 .cb_count = IPCTNL_MSG_MAX,
2150 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2151 .name = "conntrack_expect",
2152 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2153 .cb_count = IPCTNL_MSG_EXP_MAX,
2157 MODULE_ALIAS("ip_conntrack_netlink");
2158 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2159 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2161 static int __init ctnetlink_init(void)
2165 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2166 ret = nfnetlink_subsys_register(&ctnl_subsys);
2168 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2172 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2174 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2175 goto err_unreg_subsys;
2178 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2179 ret = nf_conntrack_register_notifier(&ctnl_notifier);
2181 pr_err("ctnetlink_init: cannot register notifier.\n");
2182 goto err_unreg_exp_subsys;
2185 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2187 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2188 goto err_unreg_notifier;
2194 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2196 nf_conntrack_unregister_notifier(&ctnl_notifier);
2197 err_unreg_exp_subsys:
2198 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2201 nfnetlink_subsys_unregister(&ctnl_subsys);
2206 static void __exit ctnetlink_exit(void)
2208 pr_info("ctnetlink: unregistering from nfnetlink.\n");
2210 nf_ct_remove_userspace_expectations();
2211 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2212 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2213 nf_conntrack_unregister_notifier(&ctnl_notifier);
2216 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2217 nfnetlink_subsys_unregister(&ctnl_subsys);
2220 module_init(ctnetlink_init);
2221 module_exit(ctnetlink_exit);