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>
30 #include <linux/slab.h>
32 #include <linux/netfilter.h>
33 #include <net/netlink.h>
35 #include <net/netfilter/nf_conntrack.h>
36 #include <net/netfilter/nf_conntrack_core.h>
37 #include <net/netfilter/nf_conntrack_expect.h>
38 #include <net/netfilter/nf_conntrack_helper.h>
39 #include <net/netfilter/nf_conntrack_l3proto.h>
40 #include <net/netfilter/nf_conntrack_l4proto.h>
41 #include <net/netfilter/nf_conntrack_tuple.h>
42 #include <net/netfilter/nf_conntrack_acct.h>
43 #include <net/netfilter/nf_conntrack_zones.h>
44 #ifdef CONFIG_NF_NAT_NEEDED
45 #include <net/netfilter/nf_nat_core.h>
46 #include <net/netfilter/nf_nat_protocol.h>
49 #include <linux/netfilter/nfnetlink.h>
50 #include <linux/netfilter/nfnetlink_conntrack.h>
52 MODULE_LICENSE("GPL");
54 static char __initdata version[] = "0.93";
57 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
58 const struct nf_conntrack_tuple *tuple,
59 struct nf_conntrack_l4proto *l4proto)
62 struct nlattr *nest_parms;
64 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
67 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
69 if (likely(l4proto->tuple_to_nlattr))
70 ret = l4proto->tuple_to_nlattr(skb, tuple);
72 nla_nest_end(skb, nest_parms);
81 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
82 const struct nf_conntrack_tuple *tuple,
83 struct nf_conntrack_l3proto *l3proto)
86 struct nlattr *nest_parms;
88 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
92 if (likely(l3proto->tuple_to_nlattr))
93 ret = l3proto->tuple_to_nlattr(skb, tuple);
95 nla_nest_end(skb, nest_parms);
104 ctnetlink_dump_tuples(struct sk_buff *skb,
105 const struct nf_conntrack_tuple *tuple)
108 struct nf_conntrack_l3proto *l3proto;
109 struct nf_conntrack_l4proto *l4proto;
111 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
112 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
114 if (unlikely(ret < 0))
117 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
118 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
124 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
126 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
134 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
136 long timeout = (ct->timeout.expires - jiffies) / HZ;
141 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
149 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
151 struct nf_conntrack_l4proto *l4proto;
152 struct nlattr *nest_proto;
155 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
156 if (!l4proto->to_nlattr)
159 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
161 goto nla_put_failure;
163 ret = l4proto->to_nlattr(skb, nest_proto, ct);
165 nla_nest_end(skb, nest_proto);
174 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
176 struct nlattr *nest_helper;
177 const struct nf_conn_help *help = nfct_help(ct);
178 struct nf_conntrack_helper *helper;
183 helper = rcu_dereference(help->helper);
187 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
189 goto nla_put_failure;
190 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
192 if (helper->to_nlattr)
193 helper->to_nlattr(skb, ct);
195 nla_nest_end(skb, nest_helper);
204 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
205 enum ip_conntrack_dir dir)
207 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
208 struct nlattr *nest_count;
209 const struct nf_conn_counter *acct;
211 acct = nf_conn_acct_find(ct);
215 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
217 goto nla_put_failure;
219 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
220 cpu_to_be64(acct[dir].packets));
221 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
222 cpu_to_be64(acct[dir].bytes));
224 nla_nest_end(skb, nest_count);
232 #ifdef CONFIG_NF_CONNTRACK_MARK
234 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
236 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
243 #define ctnetlink_dump_mark(a, b) (0)
246 #ifdef CONFIG_NF_CONNTRACK_SECMARK
248 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
250 NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
257 #define ctnetlink_dump_secmark(a, b) (0)
260 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
263 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
265 struct nlattr *nest_parms;
267 if (!(ct->status & IPS_EXPECTED))
270 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
272 goto nla_put_failure;
273 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
274 goto nla_put_failure;
275 nla_nest_end(skb, nest_parms);
283 #ifdef CONFIG_NF_NAT_NEEDED
285 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
287 struct nlattr *nest_parms;
289 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
291 goto nla_put_failure;
293 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
294 htonl(natseq->correction_pos));
295 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
296 htonl(natseq->offset_before));
297 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
298 htonl(natseq->offset_after));
300 nla_nest_end(skb, nest_parms);
309 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
311 struct nf_nat_seq *natseq;
312 struct nf_conn_nat *nat = nfct_nat(ct);
314 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
317 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
318 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
321 natseq = &nat->seq[IP_CT_DIR_REPLY];
322 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
328 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
332 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
334 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
342 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
344 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
352 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
353 int event, struct nf_conn *ct)
355 struct nlmsghdr *nlh;
356 struct nfgenmsg *nfmsg;
357 struct nlattr *nest_parms;
358 unsigned int flags = pid ? NLM_F_MULTI : 0;
360 event |= NFNL_SUBSYS_CTNETLINK << 8;
361 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
365 nfmsg = nlmsg_data(nlh);
366 nfmsg->nfgen_family = nf_ct_l3num(ct);
367 nfmsg->version = NFNETLINK_V0;
370 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
372 goto nla_put_failure;
373 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
374 goto nla_put_failure;
375 nla_nest_end(skb, nest_parms);
377 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
379 goto nla_put_failure;
380 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
381 goto nla_put_failure;
382 nla_nest_end(skb, nest_parms);
385 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
387 if (ctnetlink_dump_status(skb, ct) < 0 ||
388 ctnetlink_dump_timeout(skb, ct) < 0 ||
389 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
390 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
391 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
392 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
393 ctnetlink_dump_mark(skb, ct) < 0 ||
394 ctnetlink_dump_secmark(skb, ct) < 0 ||
395 ctnetlink_dump_id(skb, ct) < 0 ||
396 ctnetlink_dump_use(skb, ct) < 0 ||
397 ctnetlink_dump_master(skb, ct) < 0 ||
398 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
399 goto nla_put_failure;
406 nlmsg_cancel(skb, nlh);
410 #ifdef CONFIG_NF_CONNTRACK_EVENTS
412 ctnetlink_proto_size(const struct nf_conn *ct)
414 struct nf_conntrack_l3proto *l3proto;
415 struct nf_conntrack_l4proto *l4proto;
419 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
420 len += l3proto->nla_size;
422 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
423 len += l4proto->nla_size;
430 ctnetlink_nlmsg_size(const struct nf_conn *ct)
432 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
433 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
434 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
435 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
436 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
437 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
438 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
439 #ifdef CONFIG_NF_CT_ACCT
440 + 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
441 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
442 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
444 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
445 + nla_total_size(0) /* CTA_PROTOINFO */
446 + nla_total_size(0) /* CTA_HELP */
447 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
448 #ifdef CONFIG_NF_CONNTRACK_SECMARK
449 + nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
451 #ifdef CONFIG_NF_NAT_NEEDED
452 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
453 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
455 #ifdef CONFIG_NF_CONNTRACK_MARK
456 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
458 + ctnetlink_proto_size(ct)
463 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
466 struct nlmsghdr *nlh;
467 struct nfgenmsg *nfmsg;
468 struct nlattr *nest_parms;
469 struct nf_conn *ct = item->ct;
472 unsigned int flags = 0, group;
475 /* ignore our fake conntrack entry */
476 if (ct == &nf_conntrack_untracked)
479 if (events & (1 << IPCT_DESTROY)) {
480 type = IPCTNL_MSG_CT_DELETE;
481 group = NFNLGRP_CONNTRACK_DESTROY;
482 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
483 type = IPCTNL_MSG_CT_NEW;
484 flags = NLM_F_CREATE|NLM_F_EXCL;
485 group = NFNLGRP_CONNTRACK_NEW;
487 type = IPCTNL_MSG_CT_NEW;
488 group = NFNLGRP_CONNTRACK_UPDATE;
493 if (!item->report && !nfnetlink_has_listeners(net, group))
496 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
500 type |= NFNL_SUBSYS_CTNETLINK << 8;
501 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
505 nfmsg = nlmsg_data(nlh);
506 nfmsg->nfgen_family = nf_ct_l3num(ct);
507 nfmsg->version = NFNETLINK_V0;
511 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
513 goto nla_put_failure;
514 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
515 goto nla_put_failure;
516 nla_nest_end(skb, nest_parms);
518 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
520 goto nla_put_failure;
521 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
522 goto nla_put_failure;
523 nla_nest_end(skb, nest_parms);
526 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
528 if (ctnetlink_dump_id(skb, ct) < 0)
529 goto nla_put_failure;
531 if (ctnetlink_dump_status(skb, ct) < 0)
532 goto nla_put_failure;
534 if (events & (1 << IPCT_DESTROY)) {
535 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
536 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
537 goto nla_put_failure;
539 if (ctnetlink_dump_timeout(skb, ct) < 0)
540 goto nla_put_failure;
542 if (events & (1 << IPCT_PROTOINFO)
543 && ctnetlink_dump_protoinfo(skb, ct) < 0)
544 goto nla_put_failure;
546 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
547 && ctnetlink_dump_helpinfo(skb, ct) < 0)
548 goto nla_put_failure;
550 #ifdef CONFIG_NF_CONNTRACK_SECMARK
551 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
552 && ctnetlink_dump_secmark(skb, ct) < 0)
553 goto nla_put_failure;
556 if (events & (1 << IPCT_RELATED) &&
557 ctnetlink_dump_master(skb, ct) < 0)
558 goto nla_put_failure;
560 if (events & (1 << IPCT_NATSEQADJ) &&
561 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
562 goto nla_put_failure;
565 #ifdef CONFIG_NF_CONNTRACK_MARK
566 if ((events & (1 << IPCT_MARK) || ct->mark)
567 && ctnetlink_dump_mark(skb, ct) < 0)
568 goto nla_put_failure;
573 err = nfnetlink_send(skb, net, item->pid, group, item->report,
575 if (err == -ENOBUFS || err == -EAGAIN)
582 nlmsg_cancel(skb, nlh);
586 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
591 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
593 static int ctnetlink_done(struct netlink_callback *cb)
596 nf_ct_put((struct nf_conn *)cb->args[1]);
601 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
603 struct net *net = sock_net(skb->sk);
604 struct nf_conn *ct, *last;
605 struct nf_conntrack_tuple_hash *h;
606 struct hlist_nulls_node *n;
607 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
608 u_int8_t l3proto = nfmsg->nfgen_family;
611 last = (struct nf_conn *)cb->args[1];
612 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
614 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
616 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
618 ct = nf_ct_tuplehash_to_ctrack(h);
619 if (!atomic_inc_not_zero(&ct->ct_general.use))
621 /* Dump entries of a given L3 protocol number.
622 * If it is not specified, ie. l3proto == 0,
623 * then dump everything. */
624 if (l3proto && nf_ct_l3num(ct) != l3proto)
631 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
633 IPCTNL_MSG_CT_NEW, ct) < 0) {
634 cb->args[1] = (unsigned long)ct;
638 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
639 IPCTNL_MSG_CT_GET_CTRZERO) {
640 struct nf_conn_counter *acct;
642 acct = nf_conn_acct_find(ct);
644 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
663 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
665 struct nlattr *tb[CTA_IP_MAX+1];
666 struct nf_conntrack_l3proto *l3proto;
669 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
672 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
674 if (likely(l3proto->nlattr_to_tuple)) {
675 ret = nla_validate_nested(attr, CTA_IP_MAX,
676 l3proto->nla_policy);
678 ret = l3proto->nlattr_to_tuple(tb, tuple);
686 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
687 [CTA_PROTO_NUM] = { .type = NLA_U8 },
691 ctnetlink_parse_tuple_proto(struct nlattr *attr,
692 struct nf_conntrack_tuple *tuple)
694 struct nlattr *tb[CTA_PROTO_MAX+1];
695 struct nf_conntrack_l4proto *l4proto;
698 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
702 if (!tb[CTA_PROTO_NUM])
704 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
707 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
709 if (likely(l4proto->nlattr_to_tuple)) {
710 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
711 l4proto->nla_policy);
713 ret = l4proto->nlattr_to_tuple(tb, tuple);
721 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
722 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
723 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
727 ctnetlink_parse_tuple(const struct nlattr * const cda[],
728 struct nf_conntrack_tuple *tuple,
729 enum ctattr_tuple type, u_int8_t l3num)
731 struct nlattr *tb[CTA_TUPLE_MAX+1];
734 memset(tuple, 0, sizeof(*tuple));
736 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
738 if (!tb[CTA_TUPLE_IP])
741 tuple->src.l3num = l3num;
743 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
747 if (!tb[CTA_TUPLE_PROTO])
750 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
754 /* orig and expect tuples get DIR_ORIGINAL */
755 if (type == CTA_TUPLE_REPLY)
756 tuple->dst.dir = IP_CT_DIR_REPLY;
758 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
764 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
767 #ifdef CONFIG_NF_CONNTRACK_ZONES
768 *zone = ntohs(nla_get_be16(attr));
778 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
779 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
783 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
785 struct nlattr *tb[CTA_HELP_MAX+1];
787 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
789 if (!tb[CTA_HELP_NAME])
792 *helper_name = nla_data(tb[CTA_HELP_NAME]);
797 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
798 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
799 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
800 [CTA_STATUS] = { .type = NLA_U32 },
801 [CTA_PROTOINFO] = { .type = NLA_NESTED },
802 [CTA_HELP] = { .type = NLA_NESTED },
803 [CTA_NAT_SRC] = { .type = NLA_NESTED },
804 [CTA_TIMEOUT] = { .type = NLA_U32 },
805 [CTA_MARK] = { .type = NLA_U32 },
806 [CTA_ID] = { .type = NLA_U32 },
807 [CTA_NAT_DST] = { .type = NLA_NESTED },
808 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
809 [CTA_ZONE] = { .type = NLA_U16 },
813 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
814 const struct nlmsghdr *nlh,
815 const struct nlattr * const cda[])
817 struct net *net = sock_net(ctnl);
818 struct nf_conntrack_tuple_hash *h;
819 struct nf_conntrack_tuple tuple;
821 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
822 u_int8_t u3 = nfmsg->nfgen_family;
826 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
830 if (cda[CTA_TUPLE_ORIG])
831 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
832 else if (cda[CTA_TUPLE_REPLY])
833 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
835 /* Flush the whole table */
836 nf_conntrack_flush_report(net,
845 h = nf_conntrack_find_get(net, zone, &tuple);
849 ct = nf_ct_tuplehash_to_ctrack(h);
852 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
853 if (id != (u32)(unsigned long)ct) {
859 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
861 nlmsg_report(nlh)) < 0) {
862 nf_ct_delete_from_lists(ct);
863 /* we failed to report the event, try later */
864 nf_ct_insert_dying_list(ct);
869 /* death_by_timeout would report the event again */
870 set_bit(IPS_DYING_BIT, &ct->status);
879 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
880 const struct nlmsghdr *nlh,
881 const struct nlattr * const cda[])
883 struct net *net = sock_net(ctnl);
884 struct nf_conntrack_tuple_hash *h;
885 struct nf_conntrack_tuple tuple;
887 struct sk_buff *skb2 = NULL;
888 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
889 u_int8_t u3 = nfmsg->nfgen_family;
893 if (nlh->nlmsg_flags & NLM_F_DUMP)
894 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
897 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
901 if (cda[CTA_TUPLE_ORIG])
902 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
903 else if (cda[CTA_TUPLE_REPLY])
904 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
911 h = nf_conntrack_find_get(net, zone, &tuple);
915 ct = nf_ct_tuplehash_to_ctrack(h);
918 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
925 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
926 IPCTNL_MSG_CT_NEW, ct);
932 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
944 #ifdef CONFIG_NF_NAT_NEEDED
946 ctnetlink_parse_nat_setup(struct nf_conn *ct,
947 enum nf_nat_manip_type manip,
948 const struct nlattr *attr)
950 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
952 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
953 if (!parse_nat_setup) {
954 #ifdef CONFIG_MODULES
956 spin_unlock_bh(&nf_conntrack_lock);
958 if (request_module("nf-nat-ipv4") < 0) {
960 spin_lock_bh(&nf_conntrack_lock);
965 spin_lock_bh(&nf_conntrack_lock);
967 if (nfnetlink_parse_nat_setup_hook)
973 return parse_nat_setup(ct, manip, attr);
978 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
981 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
982 d = ct->status ^ status;
984 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
988 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
989 /* SEEN_REPLY bit can only be set */
992 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
993 /* ASSURED bit can only be set */
996 /* Be careful here, modifying NAT bits can screw up things,
997 * so don't let users modify them directly if they don't pass
999 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1004 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1006 #ifdef CONFIG_NF_NAT_NEEDED
1009 if (cda[CTA_NAT_DST]) {
1010 ret = ctnetlink_parse_nat_setup(ct,
1016 if (cda[CTA_NAT_SRC]) {
1017 ret = ctnetlink_parse_nat_setup(ct,
1030 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1032 struct nf_conntrack_helper *helper;
1033 struct nf_conn_help *help = nfct_help(ct);
1034 char *helpname = NULL;
1037 /* don't change helper of sibling connections */
1041 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1045 if (!strcmp(helpname, "")) {
1046 if (help && help->helper) {
1047 /* we had a helper before ... */
1048 nf_ct_remove_expectations(ct);
1049 rcu_assign_pointer(help->helper, NULL);
1055 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1056 nf_ct_protonum(ct));
1057 if (helper == NULL) {
1058 #ifdef CONFIG_MODULES
1059 spin_unlock_bh(&nf_conntrack_lock);
1061 if (request_module("nfct-helper-%s", helpname) < 0) {
1062 spin_lock_bh(&nf_conntrack_lock);
1066 spin_lock_bh(&nf_conntrack_lock);
1067 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1068 nf_ct_protonum(ct));
1076 if (help->helper == helper)
1080 /* need to zero data of old helper */
1081 memset(&help->help, 0, sizeof(help->help));
1083 /* we cannot set a helper for an existing conntrack */
1087 rcu_assign_pointer(help->helper, helper);
1093 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1095 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1097 if (!del_timer(&ct->timeout))
1100 ct->timeout.expires = jiffies + timeout * HZ;
1101 add_timer(&ct->timeout);
1106 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1107 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1108 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1109 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1113 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1115 const struct nlattr *attr = cda[CTA_PROTOINFO];
1116 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1117 struct nf_conntrack_l4proto *l4proto;
1120 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1123 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1124 if (l4proto->from_nlattr)
1125 err = l4proto->from_nlattr(tb, ct);
1131 #ifdef CONFIG_NF_NAT_NEEDED
1132 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1133 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1134 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1135 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1139 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1141 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1143 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1145 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1148 natseq->correction_pos =
1149 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1151 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1154 natseq->offset_before =
1155 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1157 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1160 natseq->offset_after =
1161 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1167 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1168 const struct nlattr * const cda[])
1171 struct nf_conn_nat *nat = nfct_nat(ct);
1176 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1177 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1178 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1182 ct->status |= IPS_SEQ_ADJUST;
1185 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1186 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1187 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1191 ct->status |= IPS_SEQ_ADJUST;
1199 ctnetlink_change_conntrack(struct nf_conn *ct,
1200 const struct nlattr * const cda[])
1204 /* only allow NAT changes and master assignation for new conntracks */
1205 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1208 if (cda[CTA_HELP]) {
1209 err = ctnetlink_change_helper(ct, cda);
1214 if (cda[CTA_TIMEOUT]) {
1215 err = ctnetlink_change_timeout(ct, cda);
1220 if (cda[CTA_STATUS]) {
1221 err = ctnetlink_change_status(ct, cda);
1226 if (cda[CTA_PROTOINFO]) {
1227 err = ctnetlink_change_protoinfo(ct, cda);
1232 #if defined(CONFIG_NF_CONNTRACK_MARK)
1234 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1237 #ifdef CONFIG_NF_NAT_NEEDED
1238 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1239 err = ctnetlink_change_nat_seq_adj(ct, cda);
1248 static struct nf_conn *
1249 ctnetlink_create_conntrack(struct net *net, u16 zone,
1250 const struct nlattr * const cda[],
1251 struct nf_conntrack_tuple *otuple,
1252 struct nf_conntrack_tuple *rtuple,
1257 struct nf_conntrack_helper *helper;
1259 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1261 return ERR_PTR(-ENOMEM);
1263 if (!cda[CTA_TIMEOUT])
1265 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1267 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1270 if (cda[CTA_HELP]) {
1271 char *helpname = NULL;
1273 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1277 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1278 nf_ct_protonum(ct));
1279 if (helper == NULL) {
1281 #ifdef CONFIG_MODULES
1282 if (request_module("nfct-helper-%s", helpname) < 0) {
1288 helper = __nf_conntrack_helper_find(helpname,
1290 nf_ct_protonum(ct));
1300 struct nf_conn_help *help;
1302 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1308 /* not in hash table yet so not strictly necessary */
1309 rcu_assign_pointer(help->helper, helper);
1312 /* try an implicit helper assignation */
1313 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1318 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1319 err = ctnetlink_change_nat(ct, cda);
1324 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1325 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1326 /* we must add conntrack extensions before confirmation. */
1327 ct->status |= IPS_CONFIRMED;
1329 if (cda[CTA_STATUS]) {
1330 err = ctnetlink_change_status(ct, cda);
1335 #ifdef CONFIG_NF_NAT_NEEDED
1336 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1337 err = ctnetlink_change_nat_seq_adj(ct, cda);
1343 if (cda[CTA_PROTOINFO]) {
1344 err = ctnetlink_change_protoinfo(ct, cda);
1349 #if defined(CONFIG_NF_CONNTRACK_MARK)
1351 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1354 /* setup master conntrack: this is a confirmed expectation */
1355 if (cda[CTA_TUPLE_MASTER]) {
1356 struct nf_conntrack_tuple master;
1357 struct nf_conntrack_tuple_hash *master_h;
1358 struct nf_conn *master_ct;
1360 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1364 master_h = nf_conntrack_find_get(net, zone, &master);
1365 if (master_h == NULL) {
1369 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1370 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1371 ct->master = master_ct;
1374 add_timer(&ct->timeout);
1375 nf_conntrack_hash_insert(ct);
1383 nf_conntrack_free(ct);
1384 return ERR_PTR(err);
1388 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1389 const struct nlmsghdr *nlh,
1390 const struct nlattr * const cda[])
1392 struct net *net = sock_net(ctnl);
1393 struct nf_conntrack_tuple otuple, rtuple;
1394 struct nf_conntrack_tuple_hash *h = NULL;
1395 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1396 u_int8_t u3 = nfmsg->nfgen_family;
1400 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1404 if (cda[CTA_TUPLE_ORIG]) {
1405 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1410 if (cda[CTA_TUPLE_REPLY]) {
1411 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1416 spin_lock_bh(&nf_conntrack_lock);
1417 if (cda[CTA_TUPLE_ORIG])
1418 h = __nf_conntrack_find(net, zone, &otuple);
1419 else if (cda[CTA_TUPLE_REPLY])
1420 h = __nf_conntrack_find(net, zone, &rtuple);
1424 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1426 enum ip_conntrack_events events;
1428 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1435 nf_conntrack_get(&ct->ct_general);
1436 spin_unlock_bh(&nf_conntrack_lock);
1437 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1438 events = IPCT_RELATED;
1442 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1443 (1 << IPCT_ASSURED) |
1444 (1 << IPCT_HELPER) |
1445 (1 << IPCT_PROTOINFO) |
1446 (1 << IPCT_NATSEQADJ) |
1447 (1 << IPCT_MARK) | events,
1448 ct, NETLINK_CB(skb).pid,
1452 spin_unlock_bh(&nf_conntrack_lock);
1456 /* implicit 'else' */
1458 /* We manipulate the conntrack inside the global conntrack table lock,
1459 * so there's no need to increase the refcount */
1461 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1462 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1464 err = ctnetlink_change_conntrack(ct, cda);
1466 nf_conntrack_get(&ct->ct_general);
1467 spin_unlock_bh(&nf_conntrack_lock);
1468 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1469 (1 << IPCT_ASSURED) |
1470 (1 << IPCT_HELPER) |
1471 (1 << IPCT_PROTOINFO) |
1472 (1 << IPCT_NATSEQADJ) |
1474 ct, NETLINK_CB(skb).pid,
1478 spin_unlock_bh(&nf_conntrack_lock);
1484 spin_unlock_bh(&nf_conntrack_lock);
1488 /***********************************************************************
1490 ***********************************************************************/
1493 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1494 const struct nf_conntrack_tuple *tuple,
1495 enum ctattr_expect type)
1497 struct nlattr *nest_parms;
1499 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1501 goto nla_put_failure;
1502 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1503 goto nla_put_failure;
1504 nla_nest_end(skb, nest_parms);
1513 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1514 const struct nf_conntrack_tuple *tuple,
1515 const struct nf_conntrack_tuple_mask *mask)
1518 struct nf_conntrack_l3proto *l3proto;
1519 struct nf_conntrack_l4proto *l4proto;
1520 struct nf_conntrack_tuple m;
1521 struct nlattr *nest_parms;
1523 memset(&m, 0xFF, sizeof(m));
1524 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1525 m.src.u.all = mask->src.u.all;
1526 m.dst.protonum = tuple->dst.protonum;
1528 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1530 goto nla_put_failure;
1532 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1533 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1535 if (unlikely(ret < 0))
1536 goto nla_put_failure;
1538 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1539 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1540 if (unlikely(ret < 0))
1541 goto nla_put_failure;
1543 nla_nest_end(skb, nest_parms);
1552 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1553 const struct nf_conntrack_expect *exp)
1555 struct nf_conn *master = exp->master;
1556 struct nf_conntrack_helper *helper;
1557 long timeout = (exp->timeout.expires - jiffies) / HZ;
1562 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1563 goto nla_put_failure;
1564 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1565 goto nla_put_failure;
1566 if (ctnetlink_exp_dump_tuple(skb,
1567 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1568 CTA_EXPECT_MASTER) < 0)
1569 goto nla_put_failure;
1571 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1572 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1573 helper = rcu_dereference(nfct_help(master)->helper);
1575 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1584 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1585 int event, const struct nf_conntrack_expect *exp)
1587 struct nlmsghdr *nlh;
1588 struct nfgenmsg *nfmsg;
1589 unsigned int flags = pid ? NLM_F_MULTI : 0;
1591 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1592 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1596 nfmsg = nlmsg_data(nlh);
1597 nfmsg->nfgen_family = exp->tuple.src.l3num;
1598 nfmsg->version = NFNETLINK_V0;
1601 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1602 goto nla_put_failure;
1604 nlmsg_end(skb, nlh);
1609 nlmsg_cancel(skb, nlh);
1613 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1615 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1617 struct nf_conntrack_expect *exp = item->exp;
1618 struct net *net = nf_ct_exp_net(exp);
1619 struct nlmsghdr *nlh;
1620 struct nfgenmsg *nfmsg;
1621 struct sk_buff *skb;
1625 if (events & (1 << IPEXP_NEW)) {
1626 type = IPCTNL_MSG_EXP_NEW;
1627 flags = NLM_F_CREATE|NLM_F_EXCL;
1631 if (!item->report &&
1632 !nfnetlink_has_listeners(net, NFNLGRP_CONNTRACK_EXP_NEW))
1635 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1639 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1640 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1644 nfmsg = nlmsg_data(nlh);
1645 nfmsg->nfgen_family = exp->tuple.src.l3num;
1646 nfmsg->version = NFNETLINK_V0;
1650 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1651 goto nla_put_failure;
1654 nlmsg_end(skb, nlh);
1655 nfnetlink_send(skb, net, item->pid, NFNLGRP_CONNTRACK_EXP_NEW,
1656 item->report, GFP_ATOMIC);
1661 nlmsg_cancel(skb, nlh);
1665 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1669 static int ctnetlink_exp_done(struct netlink_callback *cb)
1672 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1677 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1679 struct net *net = sock_net(skb->sk);
1680 struct nf_conntrack_expect *exp, *last;
1681 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1682 struct hlist_node *n;
1683 u_int8_t l3proto = nfmsg->nfgen_family;
1686 last = (struct nf_conntrack_expect *)cb->args[1];
1687 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1689 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1691 if (l3proto && exp->tuple.src.l3num != l3proto)
1698 if (ctnetlink_exp_fill_info(skb,
1699 NETLINK_CB(cb->skb).pid,
1703 if (!atomic_inc_not_zero(&exp->use))
1705 cb->args[1] = (unsigned long)exp;
1717 nf_ct_expect_put(last);
1722 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1723 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1724 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1725 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1726 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1727 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1728 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1732 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1733 const struct nlmsghdr *nlh,
1734 const struct nlattr * const cda[])
1736 struct net *net = sock_net(ctnl);
1737 struct nf_conntrack_tuple tuple;
1738 struct nf_conntrack_expect *exp;
1739 struct sk_buff *skb2;
1740 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1741 u_int8_t u3 = nfmsg->nfgen_family;
1745 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1746 return netlink_dump_start(ctnl, skb, nlh,
1747 ctnetlink_exp_dump_table,
1748 ctnetlink_exp_done);
1751 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1755 if (cda[CTA_EXPECT_MASTER])
1756 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1763 exp = nf_ct_expect_find_get(net, zone, &tuple);
1767 if (cda[CTA_EXPECT_ID]) {
1768 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1769 if (ntohl(id) != (u32)(unsigned long)exp) {
1770 nf_ct_expect_put(exp);
1776 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1781 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1782 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1787 nf_ct_expect_put(exp);
1789 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1794 nf_ct_expect_put(exp);
1799 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1800 const struct nlmsghdr *nlh,
1801 const struct nlattr * const cda[])
1803 struct net *net = sock_net(ctnl);
1804 struct nf_conntrack_expect *exp;
1805 struct nf_conntrack_tuple tuple;
1806 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1807 struct hlist_node *n, *next;
1808 u_int8_t u3 = nfmsg->nfgen_family;
1813 if (cda[CTA_EXPECT_TUPLE]) {
1814 /* delete a single expect by tuple */
1815 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1819 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1823 /* bump usage count to 2 */
1824 exp = nf_ct_expect_find_get(net, zone, &tuple);
1828 if (cda[CTA_EXPECT_ID]) {
1829 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1830 if (ntohl(id) != (u32)(unsigned long)exp) {
1831 nf_ct_expect_put(exp);
1836 /* after list removal, usage count == 1 */
1837 nf_ct_unexpect_related(exp);
1838 /* have to put what we 'get' above.
1839 * after this line usage count == 0 */
1840 nf_ct_expect_put(exp);
1841 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1842 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1843 struct nf_conn_help *m_help;
1845 /* delete all expectations for this helper */
1846 spin_lock_bh(&nf_conntrack_lock);
1847 for (i = 0; i < nf_ct_expect_hsize; i++) {
1848 hlist_for_each_entry_safe(exp, n, next,
1849 &net->ct.expect_hash[i],
1851 m_help = nfct_help(exp->master);
1852 if (!strcmp(m_help->helper->name, name) &&
1853 del_timer(&exp->timeout)) {
1854 nf_ct_unlink_expect(exp);
1855 nf_ct_expect_put(exp);
1859 spin_unlock_bh(&nf_conntrack_lock);
1861 /* This basically means we have to flush everything*/
1862 spin_lock_bh(&nf_conntrack_lock);
1863 for (i = 0; i < nf_ct_expect_hsize; i++) {
1864 hlist_for_each_entry_safe(exp, n, next,
1865 &net->ct.expect_hash[i],
1867 if (del_timer(&exp->timeout)) {
1868 nf_ct_unlink_expect(exp);
1869 nf_ct_expect_put(exp);
1873 spin_unlock_bh(&nf_conntrack_lock);
1879 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1880 const struct nlattr * const cda[])
1886 ctnetlink_create_expect(struct net *net, u16 zone,
1887 const struct nlattr * const cda[],
1889 u32 pid, int report)
1891 struct nf_conntrack_tuple tuple, mask, master_tuple;
1892 struct nf_conntrack_tuple_hash *h = NULL;
1893 struct nf_conntrack_expect *exp;
1895 struct nf_conn_help *help;
1898 /* caller guarantees that those three CTA_EXPECT_* exist */
1899 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1902 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1905 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1909 /* Look for master conntrack of this expectation */
1910 h = nf_conntrack_find_get(net, zone, &master_tuple);
1913 ct = nf_ct_tuplehash_to_ctrack(h);
1914 help = nfct_help(ct);
1916 if (!help || !help->helper) {
1917 /* such conntrack hasn't got any helper, abort */
1922 exp = nf_ct_expect_alloc(ct);
1929 exp->expectfn = NULL;
1933 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1934 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1935 exp->mask.src.u.all = mask.src.u.all;
1937 err = nf_ct_expect_related_report(exp, pid, report);
1938 nf_ct_expect_put(exp);
1941 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1946 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1947 const struct nlmsghdr *nlh,
1948 const struct nlattr * const cda[])
1950 struct net *net = sock_net(ctnl);
1951 struct nf_conntrack_tuple tuple;
1952 struct nf_conntrack_expect *exp;
1953 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1954 u_int8_t u3 = nfmsg->nfgen_family;
1958 if (!cda[CTA_EXPECT_TUPLE]
1959 || !cda[CTA_EXPECT_MASK]
1960 || !cda[CTA_EXPECT_MASTER])
1963 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1967 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1971 spin_lock_bh(&nf_conntrack_lock);
1972 exp = __nf_ct_expect_find(net, zone, &tuple);
1975 spin_unlock_bh(&nf_conntrack_lock);
1977 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1978 err = ctnetlink_create_expect(net, zone, cda,
1980 NETLINK_CB(skb).pid,
1987 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1988 err = ctnetlink_change_expect(exp, cda);
1989 spin_unlock_bh(&nf_conntrack_lock);
1994 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1995 static struct nf_ct_event_notifier ctnl_notifier = {
1996 .fcn = ctnetlink_conntrack_event,
1999 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2000 .fcn = ctnetlink_expect_event,
2004 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2005 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2006 .attr_count = CTA_MAX,
2007 .policy = ct_nla_policy },
2008 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2009 .attr_count = CTA_MAX,
2010 .policy = ct_nla_policy },
2011 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2012 .attr_count = CTA_MAX,
2013 .policy = ct_nla_policy },
2014 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2015 .attr_count = CTA_MAX,
2016 .policy = ct_nla_policy },
2019 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2020 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2021 .attr_count = CTA_EXPECT_MAX,
2022 .policy = exp_nla_policy },
2023 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2024 .attr_count = CTA_EXPECT_MAX,
2025 .policy = exp_nla_policy },
2026 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2027 .attr_count = CTA_EXPECT_MAX,
2028 .policy = exp_nla_policy },
2031 static const struct nfnetlink_subsystem ctnl_subsys = {
2032 .name = "conntrack",
2033 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2034 .cb_count = IPCTNL_MSG_MAX,
2038 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2039 .name = "conntrack_expect",
2040 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2041 .cb_count = IPCTNL_MSG_EXP_MAX,
2045 MODULE_ALIAS("ip_conntrack_netlink");
2046 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2047 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2049 static int __init ctnetlink_init(void)
2053 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
2054 ret = nfnetlink_subsys_register(&ctnl_subsys);
2056 printk("ctnetlink_init: cannot register with nfnetlink.\n");
2060 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2062 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
2063 goto err_unreg_subsys;
2066 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2067 ret = nf_conntrack_register_notifier(&ctnl_notifier);
2069 printk("ctnetlink_init: cannot register notifier.\n");
2070 goto err_unreg_exp_subsys;
2073 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2075 printk("ctnetlink_init: cannot expect register notifier.\n");
2076 goto err_unreg_notifier;
2082 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2084 nf_conntrack_unregister_notifier(&ctnl_notifier);
2085 err_unreg_exp_subsys:
2086 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2089 nfnetlink_subsys_unregister(&ctnl_subsys);
2094 static void __exit ctnetlink_exit(void)
2096 printk("ctnetlink: unregistering from nfnetlink.\n");
2098 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2099 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2100 nf_conntrack_unregister_notifier(&ctnl_notifier);
2103 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2104 nfnetlink_subsys_unregister(&ctnl_subsys);
2108 module_init(ctnetlink_init);
2109 module_exit(ctnetlink_exit);