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 nf_conntrack_get(&ct->ct_general);
714 cb->args[1] = (unsigned long)ct;
718 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
719 IPCTNL_MSG_CT_GET_CTRZERO) {
720 struct nf_conn_counter *acct;
722 acct = nf_conn_acct_find(ct);
724 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
733 spin_unlock_bh(&nf_conntrack_lock);
741 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
743 struct nlattr *tb[CTA_IP_MAX+1];
744 struct nf_conntrack_l3proto *l3proto;
747 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
750 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
752 if (likely(l3proto->nlattr_to_tuple)) {
753 ret = nla_validate_nested(attr, CTA_IP_MAX,
754 l3proto->nla_policy);
756 ret = l3proto->nlattr_to_tuple(tb, tuple);
764 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
765 [CTA_PROTO_NUM] = { .type = NLA_U8 },
769 ctnetlink_parse_tuple_proto(struct nlattr *attr,
770 struct nf_conntrack_tuple *tuple)
772 struct nlattr *tb[CTA_PROTO_MAX+1];
773 struct nf_conntrack_l4proto *l4proto;
776 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
780 if (!tb[CTA_PROTO_NUM])
782 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
785 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
787 if (likely(l4proto->nlattr_to_tuple)) {
788 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
789 l4proto->nla_policy);
791 ret = l4proto->nlattr_to_tuple(tb, tuple);
799 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
800 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
801 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
805 ctnetlink_parse_tuple(const struct nlattr * const cda[],
806 struct nf_conntrack_tuple *tuple,
807 enum ctattr_type type, u_int8_t l3num)
809 struct nlattr *tb[CTA_TUPLE_MAX+1];
812 memset(tuple, 0, sizeof(*tuple));
814 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
816 if (!tb[CTA_TUPLE_IP])
819 tuple->src.l3num = l3num;
821 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
825 if (!tb[CTA_TUPLE_PROTO])
828 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
832 /* orig and expect tuples get DIR_ORIGINAL */
833 if (type == CTA_TUPLE_REPLY)
834 tuple->dst.dir = IP_CT_DIR_REPLY;
836 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
842 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
845 #ifdef CONFIG_NF_CONNTRACK_ZONES
846 *zone = ntohs(nla_get_be16(attr));
856 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
857 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
861 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
863 struct nlattr *tb[CTA_HELP_MAX+1];
865 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
867 if (!tb[CTA_HELP_NAME])
870 *helper_name = nla_data(tb[CTA_HELP_NAME]);
875 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
876 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
877 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
878 [CTA_STATUS] = { .type = NLA_U32 },
879 [CTA_PROTOINFO] = { .type = NLA_NESTED },
880 [CTA_HELP] = { .type = NLA_NESTED },
881 [CTA_NAT_SRC] = { .type = NLA_NESTED },
882 [CTA_TIMEOUT] = { .type = NLA_U32 },
883 [CTA_MARK] = { .type = NLA_U32 },
884 [CTA_ID] = { .type = NLA_U32 },
885 [CTA_NAT_DST] = { .type = NLA_NESTED },
886 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
887 [CTA_ZONE] = { .type = NLA_U16 },
891 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
892 const struct nlmsghdr *nlh,
893 const struct nlattr * const cda[])
895 struct net *net = sock_net(ctnl);
896 struct nf_conntrack_tuple_hash *h;
897 struct nf_conntrack_tuple tuple;
899 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
900 u_int8_t u3 = nfmsg->nfgen_family;
904 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
908 if (cda[CTA_TUPLE_ORIG])
909 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
910 else if (cda[CTA_TUPLE_REPLY])
911 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
913 /* Flush the whole table */
914 nf_conntrack_flush_report(net,
923 h = nf_conntrack_find_get(net, zone, &tuple);
927 ct = nf_ct_tuplehash_to_ctrack(h);
930 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
931 if (id != (u32)(unsigned long)ct) {
937 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
939 nlmsg_report(nlh)) < 0) {
940 nf_ct_delete_from_lists(ct);
941 /* we failed to report the event, try later */
942 nf_ct_insert_dying_list(ct);
947 /* death_by_timeout would report the event again */
948 set_bit(IPS_DYING_BIT, &ct->status);
957 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
958 const struct nlmsghdr *nlh,
959 const struct nlattr * const cda[])
961 struct net *net = sock_net(ctnl);
962 struct nf_conntrack_tuple_hash *h;
963 struct nf_conntrack_tuple tuple;
965 struct sk_buff *skb2 = NULL;
966 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
967 u_int8_t u3 = nfmsg->nfgen_family;
971 if (nlh->nlmsg_flags & NLM_F_DUMP)
972 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
975 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
979 if (cda[CTA_TUPLE_ORIG])
980 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
981 else if (cda[CTA_TUPLE_REPLY])
982 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
989 h = nf_conntrack_find_get(net, zone, &tuple);
993 ct = nf_ct_tuplehash_to_ctrack(h);
996 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1003 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
1004 IPCTNL_MSG_CT_NEW, ct);
1010 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1019 /* this avoids a loop in nfnetlink. */
1020 return err == -EAGAIN ? -ENOBUFS : err;
1023 #ifdef CONFIG_NF_NAT_NEEDED
1025 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1026 enum nf_nat_manip_type manip,
1027 const struct nlattr *attr)
1029 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1031 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1032 if (!parse_nat_setup) {
1033 #ifdef CONFIG_MODULES
1035 spin_unlock_bh(&nf_conntrack_lock);
1037 if (request_module("nf-nat-ipv4") < 0) {
1039 spin_lock_bh(&nf_conntrack_lock);
1044 spin_lock_bh(&nf_conntrack_lock);
1046 if (nfnetlink_parse_nat_setup_hook)
1052 return parse_nat_setup(ct, manip, attr);
1057 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1060 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1061 d = ct->status ^ status;
1063 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1067 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1068 /* SEEN_REPLY bit can only be set */
1071 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1072 /* ASSURED bit can only be set */
1075 /* Be careful here, modifying NAT bits can screw up things,
1076 * so don't let users modify them directly if they don't pass
1078 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1083 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1085 #ifdef CONFIG_NF_NAT_NEEDED
1088 if (cda[CTA_NAT_DST]) {
1089 ret = ctnetlink_parse_nat_setup(ct,
1095 if (cda[CTA_NAT_SRC]) {
1096 ret = ctnetlink_parse_nat_setup(ct,
1109 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1111 struct nf_conntrack_helper *helper;
1112 struct nf_conn_help *help = nfct_help(ct);
1113 char *helpname = NULL;
1116 /* don't change helper of sibling connections */
1120 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1124 if (!strcmp(helpname, "")) {
1125 if (help && help->helper) {
1126 /* we had a helper before ... */
1127 nf_ct_remove_expectations(ct);
1128 RCU_INIT_POINTER(help->helper, NULL);
1134 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1135 nf_ct_protonum(ct));
1136 if (helper == NULL) {
1137 #ifdef CONFIG_MODULES
1138 spin_unlock_bh(&nf_conntrack_lock);
1140 if (request_module("nfct-helper-%s", helpname) < 0) {
1141 spin_lock_bh(&nf_conntrack_lock);
1145 spin_lock_bh(&nf_conntrack_lock);
1146 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1147 nf_ct_protonum(ct));
1155 if (help->helper == helper)
1159 /* need to zero data of old helper */
1160 memset(&help->help, 0, sizeof(help->help));
1162 /* we cannot set a helper for an existing conntrack */
1166 RCU_INIT_POINTER(help->helper, helper);
1172 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1174 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1176 if (!del_timer(&ct->timeout))
1179 ct->timeout.expires = jiffies + timeout * HZ;
1180 add_timer(&ct->timeout);
1185 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1186 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1187 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1188 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1192 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1194 const struct nlattr *attr = cda[CTA_PROTOINFO];
1195 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1196 struct nf_conntrack_l4proto *l4proto;
1199 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1202 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1203 if (l4proto->from_nlattr)
1204 err = l4proto->from_nlattr(tb, ct);
1210 #ifdef CONFIG_NF_NAT_NEEDED
1211 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1212 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1213 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1214 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1218 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1220 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1222 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1224 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1227 natseq->correction_pos =
1228 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1230 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1233 natseq->offset_before =
1234 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1236 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1239 natseq->offset_after =
1240 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1246 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1247 const struct nlattr * const cda[])
1250 struct nf_conn_nat *nat = nfct_nat(ct);
1255 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1256 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1257 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1261 ct->status |= IPS_SEQ_ADJUST;
1264 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1265 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1266 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1270 ct->status |= IPS_SEQ_ADJUST;
1278 ctnetlink_change_conntrack(struct nf_conn *ct,
1279 const struct nlattr * const cda[])
1283 /* only allow NAT changes and master assignation for new conntracks */
1284 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1287 if (cda[CTA_HELP]) {
1288 err = ctnetlink_change_helper(ct, cda);
1293 if (cda[CTA_TIMEOUT]) {
1294 err = ctnetlink_change_timeout(ct, cda);
1299 if (cda[CTA_STATUS]) {
1300 err = ctnetlink_change_status(ct, cda);
1305 if (cda[CTA_PROTOINFO]) {
1306 err = ctnetlink_change_protoinfo(ct, cda);
1311 #if defined(CONFIG_NF_CONNTRACK_MARK)
1313 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1316 #ifdef CONFIG_NF_NAT_NEEDED
1317 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1318 err = ctnetlink_change_nat_seq_adj(ct, cda);
1327 static struct nf_conn *
1328 ctnetlink_create_conntrack(struct net *net, u16 zone,
1329 const struct nlattr * const cda[],
1330 struct nf_conntrack_tuple *otuple,
1331 struct nf_conntrack_tuple *rtuple,
1336 struct nf_conntrack_helper *helper;
1337 struct nf_conn_tstamp *tstamp;
1339 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1341 return ERR_PTR(-ENOMEM);
1343 if (!cda[CTA_TIMEOUT])
1345 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1347 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1350 if (cda[CTA_HELP]) {
1351 char *helpname = NULL;
1353 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1357 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1358 nf_ct_protonum(ct));
1359 if (helper == NULL) {
1361 #ifdef CONFIG_MODULES
1362 if (request_module("nfct-helper-%s", helpname) < 0) {
1368 helper = __nf_conntrack_helper_find(helpname,
1370 nf_ct_protonum(ct));
1380 struct nf_conn_help *help;
1382 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1388 /* not in hash table yet so not strictly necessary */
1389 RCU_INIT_POINTER(help->helper, helper);
1392 /* try an implicit helper assignation */
1393 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1398 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1399 err = ctnetlink_change_nat(ct, cda);
1404 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1405 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1406 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1407 /* we must add conntrack extensions before confirmation. */
1408 ct->status |= IPS_CONFIRMED;
1410 if (cda[CTA_STATUS]) {
1411 err = ctnetlink_change_status(ct, cda);
1416 #ifdef CONFIG_NF_NAT_NEEDED
1417 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1418 err = ctnetlink_change_nat_seq_adj(ct, cda);
1424 memset(&ct->proto, 0, sizeof(ct->proto));
1425 if (cda[CTA_PROTOINFO]) {
1426 err = ctnetlink_change_protoinfo(ct, cda);
1431 #if defined(CONFIG_NF_CONNTRACK_MARK)
1433 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1436 /* setup master conntrack: this is a confirmed expectation */
1437 if (cda[CTA_TUPLE_MASTER]) {
1438 struct nf_conntrack_tuple master;
1439 struct nf_conntrack_tuple_hash *master_h;
1440 struct nf_conn *master_ct;
1442 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1446 master_h = nf_conntrack_find_get(net, zone, &master);
1447 if (master_h == NULL) {
1451 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1452 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1453 ct->master = master_ct;
1455 tstamp = nf_conn_tstamp_find(ct);
1457 tstamp->start = ktime_to_ns(ktime_get_real());
1459 add_timer(&ct->timeout);
1460 nf_conntrack_hash_insert(ct);
1468 nf_conntrack_free(ct);
1469 return ERR_PTR(err);
1473 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1474 const struct nlmsghdr *nlh,
1475 const struct nlattr * const cda[])
1477 struct net *net = sock_net(ctnl);
1478 struct nf_conntrack_tuple otuple, rtuple;
1479 struct nf_conntrack_tuple_hash *h = NULL;
1480 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1481 u_int8_t u3 = nfmsg->nfgen_family;
1485 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1489 if (cda[CTA_TUPLE_ORIG]) {
1490 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1495 if (cda[CTA_TUPLE_REPLY]) {
1496 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1501 spin_lock_bh(&nf_conntrack_lock);
1502 if (cda[CTA_TUPLE_ORIG])
1503 h = __nf_conntrack_find(net, zone, &otuple);
1504 else if (cda[CTA_TUPLE_REPLY])
1505 h = __nf_conntrack_find(net, zone, &rtuple);
1509 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1511 enum ip_conntrack_events events;
1513 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1520 nf_conntrack_get(&ct->ct_general);
1521 spin_unlock_bh(&nf_conntrack_lock);
1522 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1523 events = IPCT_RELATED;
1527 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1528 (1 << IPCT_ASSURED) |
1529 (1 << IPCT_HELPER) |
1530 (1 << IPCT_PROTOINFO) |
1531 (1 << IPCT_NATSEQADJ) |
1532 (1 << IPCT_MARK) | events,
1533 ct, NETLINK_CB(skb).pid,
1537 spin_unlock_bh(&nf_conntrack_lock);
1541 /* implicit 'else' */
1543 /* We manipulate the conntrack inside the global conntrack table lock,
1544 * so there's no need to increase the refcount */
1546 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1547 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1549 err = ctnetlink_change_conntrack(ct, cda);
1551 nf_conntrack_get(&ct->ct_general);
1552 spin_unlock_bh(&nf_conntrack_lock);
1553 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1554 (1 << IPCT_ASSURED) |
1555 (1 << IPCT_HELPER) |
1556 (1 << IPCT_PROTOINFO) |
1557 (1 << IPCT_NATSEQADJ) |
1559 ct, NETLINK_CB(skb).pid,
1563 spin_unlock_bh(&nf_conntrack_lock);
1569 spin_unlock_bh(&nf_conntrack_lock);
1573 /***********************************************************************
1575 ***********************************************************************/
1578 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1579 const struct nf_conntrack_tuple *tuple,
1580 enum ctattr_expect type)
1582 struct nlattr *nest_parms;
1584 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1586 goto nla_put_failure;
1587 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1588 goto nla_put_failure;
1589 nla_nest_end(skb, nest_parms);
1598 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1599 const struct nf_conntrack_tuple *tuple,
1600 const struct nf_conntrack_tuple_mask *mask)
1603 struct nf_conntrack_l3proto *l3proto;
1604 struct nf_conntrack_l4proto *l4proto;
1605 struct nf_conntrack_tuple m;
1606 struct nlattr *nest_parms;
1608 memset(&m, 0xFF, sizeof(m));
1609 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1610 m.src.u.all = mask->src.u.all;
1611 m.dst.protonum = tuple->dst.protonum;
1613 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1615 goto nla_put_failure;
1617 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1618 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1620 if (unlikely(ret < 0))
1621 goto nla_put_failure;
1623 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1624 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1625 if (unlikely(ret < 0))
1626 goto nla_put_failure;
1628 nla_nest_end(skb, nest_parms);
1637 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1638 const struct nf_conntrack_expect *exp)
1640 struct nf_conn *master = exp->master;
1641 long timeout = (exp->timeout.expires - jiffies) / HZ;
1642 struct nf_conn_help *help;
1647 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1648 goto nla_put_failure;
1649 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1650 goto nla_put_failure;
1651 if (ctnetlink_exp_dump_tuple(skb,
1652 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1653 CTA_EXPECT_MASTER) < 0)
1654 goto nla_put_failure;
1656 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1657 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1658 NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1659 help = nfct_help(master);
1661 struct nf_conntrack_helper *helper;
1663 helper = rcu_dereference(help->helper);
1665 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1675 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1676 int event, const struct nf_conntrack_expect *exp)
1678 struct nlmsghdr *nlh;
1679 struct nfgenmsg *nfmsg;
1680 unsigned int flags = pid ? NLM_F_MULTI : 0;
1682 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1683 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1687 nfmsg = nlmsg_data(nlh);
1688 nfmsg->nfgen_family = exp->tuple.src.l3num;
1689 nfmsg->version = NFNETLINK_V0;
1692 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1693 goto nla_put_failure;
1695 nlmsg_end(skb, nlh);
1700 nlmsg_cancel(skb, nlh);
1704 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1706 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1708 struct nf_conntrack_expect *exp = item->exp;
1709 struct net *net = nf_ct_exp_net(exp);
1710 struct nlmsghdr *nlh;
1711 struct nfgenmsg *nfmsg;
1712 struct sk_buff *skb;
1713 unsigned int type, group;
1716 if (events & (1 << IPEXP_DESTROY)) {
1717 type = IPCTNL_MSG_EXP_DELETE;
1718 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1719 } else if (events & (1 << IPEXP_NEW)) {
1720 type = IPCTNL_MSG_EXP_NEW;
1721 flags = NLM_F_CREATE|NLM_F_EXCL;
1722 group = NFNLGRP_CONNTRACK_EXP_NEW;
1726 if (!item->report && !nfnetlink_has_listeners(net, group))
1729 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1733 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1734 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1738 nfmsg = nlmsg_data(nlh);
1739 nfmsg->nfgen_family = exp->tuple.src.l3num;
1740 nfmsg->version = NFNETLINK_V0;
1744 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1745 goto nla_put_failure;
1748 nlmsg_end(skb, nlh);
1749 nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1754 nlmsg_cancel(skb, nlh);
1758 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1762 static int ctnetlink_exp_done(struct netlink_callback *cb)
1765 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1770 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1772 struct net *net = sock_net(skb->sk);
1773 struct nf_conntrack_expect *exp, *last;
1774 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1775 struct hlist_node *n;
1776 u_int8_t l3proto = nfmsg->nfgen_family;
1779 last = (struct nf_conntrack_expect *)cb->args[1];
1780 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1782 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1784 if (l3proto && exp->tuple.src.l3num != l3proto)
1791 if (ctnetlink_exp_fill_info(skb,
1792 NETLINK_CB(cb->skb).pid,
1796 if (!atomic_inc_not_zero(&exp->use))
1798 cb->args[1] = (unsigned long)exp;
1810 nf_ct_expect_put(last);
1815 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1816 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1817 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1818 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1819 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1820 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1821 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1822 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
1823 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
1827 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1828 const struct nlmsghdr *nlh,
1829 const struct nlattr * const cda[])
1831 struct net *net = sock_net(ctnl);
1832 struct nf_conntrack_tuple tuple;
1833 struct nf_conntrack_expect *exp;
1834 struct sk_buff *skb2;
1835 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1836 u_int8_t u3 = nfmsg->nfgen_family;
1840 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1841 return netlink_dump_start(ctnl, skb, nlh,
1842 ctnetlink_exp_dump_table,
1843 ctnetlink_exp_done, 0);
1846 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1850 if (cda[CTA_EXPECT_MASTER])
1851 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1858 exp = nf_ct_expect_find_get(net, zone, &tuple);
1862 if (cda[CTA_EXPECT_ID]) {
1863 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1864 if (ntohl(id) != (u32)(unsigned long)exp) {
1865 nf_ct_expect_put(exp);
1871 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1876 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1877 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1882 nf_ct_expect_put(exp);
1884 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1889 nf_ct_expect_put(exp);
1894 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1895 const struct nlmsghdr *nlh,
1896 const struct nlattr * const cda[])
1898 struct net *net = sock_net(ctnl);
1899 struct nf_conntrack_expect *exp;
1900 struct nf_conntrack_tuple tuple;
1901 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1902 struct hlist_node *n, *next;
1903 u_int8_t u3 = nfmsg->nfgen_family;
1908 if (cda[CTA_EXPECT_TUPLE]) {
1909 /* delete a single expect by tuple */
1910 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1914 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1918 /* bump usage count to 2 */
1919 exp = nf_ct_expect_find_get(net, zone, &tuple);
1923 if (cda[CTA_EXPECT_ID]) {
1924 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1925 if (ntohl(id) != (u32)(unsigned long)exp) {
1926 nf_ct_expect_put(exp);
1931 /* after list removal, usage count == 1 */
1932 spin_lock_bh(&nf_conntrack_lock);
1933 if (del_timer(&exp->timeout)) {
1934 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1936 nf_ct_expect_put(exp);
1938 spin_unlock_bh(&nf_conntrack_lock);
1939 /* have to put what we 'get' above.
1940 * after this line usage count == 0 */
1941 nf_ct_expect_put(exp);
1942 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1943 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1944 struct nf_conn_help *m_help;
1946 /* delete all expectations for this helper */
1947 spin_lock_bh(&nf_conntrack_lock);
1948 for (i = 0; i < nf_ct_expect_hsize; i++) {
1949 hlist_for_each_entry_safe(exp, n, next,
1950 &net->ct.expect_hash[i],
1952 m_help = nfct_help(exp->master);
1953 if (!strcmp(m_help->helper->name, name) &&
1954 del_timer(&exp->timeout)) {
1955 nf_ct_unlink_expect_report(exp,
1956 NETLINK_CB(skb).pid,
1958 nf_ct_expect_put(exp);
1962 spin_unlock_bh(&nf_conntrack_lock);
1964 /* This basically means we have to flush everything*/
1965 spin_lock_bh(&nf_conntrack_lock);
1966 for (i = 0; i < nf_ct_expect_hsize; i++) {
1967 hlist_for_each_entry_safe(exp, n, next,
1968 &net->ct.expect_hash[i],
1970 if (del_timer(&exp->timeout)) {
1971 nf_ct_unlink_expect_report(exp,
1972 NETLINK_CB(skb).pid,
1974 nf_ct_expect_put(exp);
1978 spin_unlock_bh(&nf_conntrack_lock);
1984 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1985 const struct nlattr * const cda[])
1991 ctnetlink_create_expect(struct net *net, u16 zone,
1992 const struct nlattr * const cda[],
1994 u32 pid, int report)
1996 struct nf_conntrack_tuple tuple, mask, master_tuple;
1997 struct nf_conntrack_tuple_hash *h = NULL;
1998 struct nf_conntrack_expect *exp;
2000 struct nf_conn_help *help;
2003 /* caller guarantees that those three CTA_EXPECT_* exist */
2004 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2007 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2010 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2014 /* Look for master conntrack of this expectation */
2015 h = nf_conntrack_find_get(net, zone, &master_tuple);
2018 ct = nf_ct_tuplehash_to_ctrack(h);
2019 exp = nf_ct_expect_alloc(ct);
2024 help = nfct_help(ct);
2026 if (!cda[CTA_EXPECT_TIMEOUT]) {
2030 exp->timeout.expires =
2031 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2033 exp->flags = NF_CT_EXPECT_USERSPACE;
2034 if (cda[CTA_EXPECT_FLAGS]) {
2036 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2039 if (cda[CTA_EXPECT_FLAGS]) {
2040 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2041 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2047 exp->expectfn = NULL;
2050 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2051 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2052 exp->mask.src.u.all = mask.src.u.all;
2054 err = nf_ct_expect_related_report(exp, pid, report);
2055 nf_ct_expect_put(exp);
2058 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2063 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2064 const struct nlmsghdr *nlh,
2065 const struct nlattr * const cda[])
2067 struct net *net = sock_net(ctnl);
2068 struct nf_conntrack_tuple tuple;
2069 struct nf_conntrack_expect *exp;
2070 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2071 u_int8_t u3 = nfmsg->nfgen_family;
2075 if (!cda[CTA_EXPECT_TUPLE]
2076 || !cda[CTA_EXPECT_MASK]
2077 || !cda[CTA_EXPECT_MASTER])
2080 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2084 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2088 spin_lock_bh(&nf_conntrack_lock);
2089 exp = __nf_ct_expect_find(net, zone, &tuple);
2092 spin_unlock_bh(&nf_conntrack_lock);
2094 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2095 err = ctnetlink_create_expect(net, zone, cda,
2097 NETLINK_CB(skb).pid,
2104 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2105 err = ctnetlink_change_expect(exp, cda);
2106 spin_unlock_bh(&nf_conntrack_lock);
2111 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2112 static struct nf_ct_event_notifier ctnl_notifier = {
2113 .fcn = ctnetlink_conntrack_event,
2116 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2117 .fcn = ctnetlink_expect_event,
2121 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2122 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2123 .attr_count = CTA_MAX,
2124 .policy = ct_nla_policy },
2125 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2126 .attr_count = CTA_MAX,
2127 .policy = ct_nla_policy },
2128 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2129 .attr_count = CTA_MAX,
2130 .policy = ct_nla_policy },
2131 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2132 .attr_count = CTA_MAX,
2133 .policy = ct_nla_policy },
2136 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2137 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2138 .attr_count = CTA_EXPECT_MAX,
2139 .policy = exp_nla_policy },
2140 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2141 .attr_count = CTA_EXPECT_MAX,
2142 .policy = exp_nla_policy },
2143 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2144 .attr_count = CTA_EXPECT_MAX,
2145 .policy = exp_nla_policy },
2148 static const struct nfnetlink_subsystem ctnl_subsys = {
2149 .name = "conntrack",
2150 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2151 .cb_count = IPCTNL_MSG_MAX,
2155 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2156 .name = "conntrack_expect",
2157 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2158 .cb_count = IPCTNL_MSG_EXP_MAX,
2162 MODULE_ALIAS("ip_conntrack_netlink");
2163 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2164 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2166 static int __init ctnetlink_init(void)
2170 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2171 ret = nfnetlink_subsys_register(&ctnl_subsys);
2173 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2177 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2179 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2180 goto err_unreg_subsys;
2183 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2184 ret = nf_conntrack_register_notifier(&ctnl_notifier);
2186 pr_err("ctnetlink_init: cannot register notifier.\n");
2187 goto err_unreg_exp_subsys;
2190 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2192 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2193 goto err_unreg_notifier;
2199 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2201 nf_conntrack_unregister_notifier(&ctnl_notifier);
2202 err_unreg_exp_subsys:
2203 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2206 nfnetlink_subsys_unregister(&ctnl_subsys);
2211 static void __exit ctnetlink_exit(void)
2213 pr_info("ctnetlink: unregistering from nfnetlink.\n");
2215 nf_ct_remove_userspace_expectations();
2216 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2217 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2218 nf_conntrack_unregister_notifier(&ctnl_notifier);
2221 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2222 nfnetlink_subsys_unregister(&ctnl_subsys);
2225 module_init(ctnetlink_init);
2226 module_exit(ctnetlink_exit);