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) 2005-2012 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_seqadj.h>
41 #include <net/netfilter/nf_conntrack_l3proto.h>
42 #include <net/netfilter/nf_conntrack_l4proto.h>
43 #include <net/netfilter/nf_conntrack_tuple.h>
44 #include <net/netfilter/nf_conntrack_acct.h>
45 #include <net/netfilter/nf_conntrack_zones.h>
46 #include <net/netfilter/nf_conntrack_timestamp.h>
47 #include <net/netfilter/nf_conntrack_labels.h>
48 #ifdef CONFIG_NF_NAT_NEEDED
49 #include <net/netfilter/nf_nat_core.h>
50 #include <net/netfilter/nf_nat_l4proto.h>
51 #include <net/netfilter/nf_nat_helper.h>
54 #include <linux/netfilter/nfnetlink.h>
55 #include <linux/netfilter/nfnetlink_conntrack.h>
57 MODULE_LICENSE("GPL");
59 static char __initdata version[] = "0.93";
62 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
63 const struct nf_conntrack_tuple *tuple,
64 struct nf_conntrack_l4proto *l4proto)
67 struct nlattr *nest_parms;
69 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
72 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
75 if (likely(l4proto->tuple_to_nlattr))
76 ret = l4proto->tuple_to_nlattr(skb, tuple);
78 nla_nest_end(skb, nest_parms);
87 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
88 const struct nf_conntrack_tuple *tuple,
89 struct nf_conntrack_l3proto *l3proto)
92 struct nlattr *nest_parms;
94 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
98 if (likely(l3proto->tuple_to_nlattr))
99 ret = l3proto->tuple_to_nlattr(skb, tuple);
101 nla_nest_end(skb, nest_parms);
110 ctnetlink_dump_tuples(struct sk_buff *skb,
111 const struct nf_conntrack_tuple *tuple)
114 struct nf_conntrack_l3proto *l3proto;
115 struct nf_conntrack_l4proto *l4proto;
118 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
119 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
122 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
123 tuple->dst.protonum);
124 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
131 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
133 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
134 goto nla_put_failure;
142 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
144 long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
149 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
150 goto nla_put_failure;
158 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
160 struct nf_conntrack_l4proto *l4proto;
161 struct nlattr *nest_proto;
164 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
165 if (!l4proto->to_nlattr)
168 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
170 goto nla_put_failure;
172 ret = l4proto->to_nlattr(skb, nest_proto, ct);
174 nla_nest_end(skb, nest_proto);
183 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
185 struct nlattr *nest_helper;
186 const struct nf_conn_help *help = nfct_help(ct);
187 struct nf_conntrack_helper *helper;
192 helper = rcu_dereference(help->helper);
196 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
198 goto nla_put_failure;
199 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
200 goto nla_put_failure;
202 if (helper->to_nlattr)
203 helper->to_nlattr(skb, ct);
205 nla_nest_end(skb, nest_helper);
214 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
215 enum ip_conntrack_dir dir, int type)
217 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
218 struct nf_conn_counter *counter = acct->counter;
219 struct nlattr *nest_count;
222 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
223 pkts = atomic64_xchg(&counter[dir].packets, 0);
224 bytes = atomic64_xchg(&counter[dir].bytes, 0);
226 pkts = atomic64_read(&counter[dir].packets);
227 bytes = atomic64_read(&counter[dir].bytes);
230 nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
232 goto nla_put_failure;
234 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts)) ||
235 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes)))
236 goto nla_put_failure;
238 nla_nest_end(skb, nest_count);
247 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
249 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
254 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
256 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
263 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
265 struct nlattr *nest_count;
266 const struct nf_conn_tstamp *tstamp;
268 tstamp = nf_conn_tstamp_find(ct);
272 nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
274 goto nla_put_failure;
276 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start)) ||
277 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
278 cpu_to_be64(tstamp->stop))))
279 goto nla_put_failure;
280 nla_nest_end(skb, nest_count);
288 #ifdef CONFIG_NF_CONNTRACK_MARK
290 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
292 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
293 goto nla_put_failure;
300 #define ctnetlink_dump_mark(a, b) (0)
303 #ifdef CONFIG_NF_CONNTRACK_SECMARK
305 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
307 struct nlattr *nest_secctx;
311 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
316 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
318 goto nla_put_failure;
320 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
321 goto nla_put_failure;
322 nla_nest_end(skb, nest_secctx);
326 security_release_secctx(secctx, len);
330 #define ctnetlink_dump_secctx(a, b) (0)
333 #ifdef CONFIG_NF_CONNTRACK_LABELS
334 static int ctnetlink_label_size(const struct nf_conn *ct)
336 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
340 return nla_total_size(labels->words * sizeof(long));
344 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
346 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
352 len = labels->words * sizeof(long);
355 if (labels->bits[i] != 0)
356 return nla_put(skb, CTA_LABELS, len, labels->bits);
358 } while (i < labels->words);
363 #define ctnetlink_dump_labels(a, b) (0)
364 #define ctnetlink_label_size(a) (0)
367 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
370 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
372 struct nlattr *nest_parms;
374 if (!(ct->status & IPS_EXPECTED))
377 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
379 goto nla_put_failure;
380 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
381 goto nla_put_failure;
382 nla_nest_end(skb, nest_parms);
391 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
393 struct nlattr *nest_parms;
395 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
397 goto nla_put_failure;
399 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
400 htonl(seq->correction_pos)) ||
401 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
402 htonl(seq->offset_before)) ||
403 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
404 htonl(seq->offset_after)))
405 goto nla_put_failure;
407 nla_nest_end(skb, nest_parms);
416 ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
418 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
419 struct nf_ct_seqadj *seq;
421 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
424 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
425 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
428 seq = &seqadj->seq[IP_CT_DIR_REPLY];
429 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
436 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
438 if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
439 goto nla_put_failure;
447 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
449 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
450 goto nla_put_failure;
458 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
461 struct nlmsghdr *nlh;
462 struct nfgenmsg *nfmsg;
463 struct nlattr *nest_parms;
464 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
466 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
467 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
471 nfmsg = nlmsg_data(nlh);
472 nfmsg->nfgen_family = nf_ct_l3num(ct);
473 nfmsg->version = NFNETLINK_V0;
476 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
478 goto nla_put_failure;
479 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
480 goto nla_put_failure;
481 nla_nest_end(skb, nest_parms);
483 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
485 goto nla_put_failure;
486 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
487 goto nla_put_failure;
488 nla_nest_end(skb, nest_parms);
490 if (nf_ct_zone(ct) &&
491 nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
492 goto nla_put_failure;
494 if (ctnetlink_dump_status(skb, ct) < 0 ||
495 ctnetlink_dump_timeout(skb, ct) < 0 ||
496 ctnetlink_dump_acct(skb, ct, type) < 0 ||
497 ctnetlink_dump_timestamp(skb, ct) < 0 ||
498 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
499 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
500 ctnetlink_dump_mark(skb, ct) < 0 ||
501 ctnetlink_dump_secctx(skb, ct) < 0 ||
502 ctnetlink_dump_labels(skb, ct) < 0 ||
503 ctnetlink_dump_id(skb, ct) < 0 ||
504 ctnetlink_dump_use(skb, ct) < 0 ||
505 ctnetlink_dump_master(skb, ct) < 0 ||
506 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
507 goto nla_put_failure;
514 nlmsg_cancel(skb, nlh);
519 ctnetlink_proto_size(const struct nf_conn *ct)
521 struct nf_conntrack_l3proto *l3proto;
522 struct nf_conntrack_l4proto *l4proto;
526 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
527 len += l3proto->nla_size;
529 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
530 len += l4proto->nla_size;
537 ctnetlink_acct_size(const struct nf_conn *ct)
539 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
541 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
542 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
543 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
548 ctnetlink_secctx_size(const struct nf_conn *ct)
550 #ifdef CONFIG_NF_CONNTRACK_SECMARK
553 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
557 return nla_total_size(0) /* CTA_SECCTX */
558 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
565 ctnetlink_timestamp_size(const struct nf_conn *ct)
567 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
568 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
570 return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
577 ctnetlink_nlmsg_size(const struct nf_conn *ct)
579 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
580 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
581 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
582 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
583 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
584 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
585 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
586 + ctnetlink_acct_size(ct)
587 + ctnetlink_timestamp_size(ct)
588 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
589 + nla_total_size(0) /* CTA_PROTOINFO */
590 + nla_total_size(0) /* CTA_HELP */
591 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
592 + ctnetlink_secctx_size(ct)
593 #ifdef CONFIG_NF_NAT_NEEDED
594 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
595 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
597 #ifdef CONFIG_NF_CONNTRACK_MARK
598 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
600 #ifdef CONFIG_NF_CONNTRACK_ZONES
601 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE */
603 + ctnetlink_proto_size(ct)
604 + ctnetlink_label_size(ct)
608 #ifdef CONFIG_NF_CONNTRACK_EVENTS
610 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
613 struct nlmsghdr *nlh;
614 struct nfgenmsg *nfmsg;
615 struct nlattr *nest_parms;
616 struct nf_conn *ct = item->ct;
619 unsigned int flags = 0, group;
622 /* ignore our fake conntrack entry */
623 if (nf_ct_is_untracked(ct))
626 if (events & (1 << IPCT_DESTROY)) {
627 type = IPCTNL_MSG_CT_DELETE;
628 group = NFNLGRP_CONNTRACK_DESTROY;
629 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
630 type = IPCTNL_MSG_CT_NEW;
631 flags = NLM_F_CREATE|NLM_F_EXCL;
632 group = NFNLGRP_CONNTRACK_NEW;
634 type = IPCTNL_MSG_CT_NEW;
635 group = NFNLGRP_CONNTRACK_UPDATE;
640 if (!item->report && !nfnetlink_has_listeners(net, group))
643 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
647 type |= NFNL_SUBSYS_CTNETLINK << 8;
648 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
652 nfmsg = nlmsg_data(nlh);
653 nfmsg->nfgen_family = nf_ct_l3num(ct);
654 nfmsg->version = NFNETLINK_V0;
658 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
660 goto nla_put_failure;
661 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
662 goto nla_put_failure;
663 nla_nest_end(skb, nest_parms);
665 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
667 goto nla_put_failure;
668 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
669 goto nla_put_failure;
670 nla_nest_end(skb, nest_parms);
672 if (nf_ct_zone(ct) &&
673 nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
674 goto nla_put_failure;
676 if (ctnetlink_dump_id(skb, ct) < 0)
677 goto nla_put_failure;
679 if (ctnetlink_dump_status(skb, ct) < 0)
680 goto nla_put_failure;
682 if (events & (1 << IPCT_DESTROY)) {
683 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
684 ctnetlink_dump_timestamp(skb, ct) < 0)
685 goto nla_put_failure;
687 if (ctnetlink_dump_timeout(skb, ct) < 0)
688 goto nla_put_failure;
690 if (events & (1 << IPCT_PROTOINFO)
691 && ctnetlink_dump_protoinfo(skb, ct) < 0)
692 goto nla_put_failure;
694 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
695 && ctnetlink_dump_helpinfo(skb, ct) < 0)
696 goto nla_put_failure;
698 #ifdef CONFIG_NF_CONNTRACK_SECMARK
699 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
700 && ctnetlink_dump_secctx(skb, ct) < 0)
701 goto nla_put_failure;
703 if (events & (1 << IPCT_LABEL) &&
704 ctnetlink_dump_labels(skb, ct) < 0)
705 goto nla_put_failure;
707 if (events & (1 << IPCT_RELATED) &&
708 ctnetlink_dump_master(skb, ct) < 0)
709 goto nla_put_failure;
711 if (events & (1 << IPCT_SEQADJ) &&
712 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
713 goto nla_put_failure;
716 #ifdef CONFIG_NF_CONNTRACK_MARK
717 if ((events & (1 << IPCT_MARK) || ct->mark)
718 && ctnetlink_dump_mark(skb, ct) < 0)
719 goto nla_put_failure;
724 err = nfnetlink_send(skb, net, item->portid, group, item->report,
726 if (err == -ENOBUFS || err == -EAGAIN)
733 nlmsg_cancel(skb, nlh);
737 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
742 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
744 static int ctnetlink_done(struct netlink_callback *cb)
747 nf_ct_put((struct nf_conn *)cb->args[1]);
753 struct ctnetlink_dump_filter {
761 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
763 struct net *net = sock_net(skb->sk);
764 struct nf_conn *ct, *last;
765 struct nf_conntrack_tuple_hash *h;
766 struct hlist_nulls_node *n;
767 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
768 u_int8_t l3proto = nfmsg->nfgen_family;
772 #ifdef CONFIG_NF_CONNTRACK_MARK
773 const struct ctnetlink_dump_filter *filter = cb->data;
776 last = (struct nf_conn *)cb->args[1];
779 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
781 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
783 if (cb->args[0] >= net->ct.htable_size) {
787 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
789 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
791 ct = nf_ct_tuplehash_to_ctrack(h);
792 /* Dump entries of a given L3 protocol number.
793 * If it is not specified, ie. l3proto == 0,
794 * then dump everything. */
795 if (l3proto && nf_ct_l3num(ct) != l3proto)
802 #ifdef CONFIG_NF_CONNTRACK_MARK
803 if (filter && !((ct->mark & filter->mark.mask) ==
810 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
812 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
816 nf_conntrack_get(&ct->ct_general);
817 cb->args[1] = (unsigned long)ct;
837 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
839 struct nlattr *tb[CTA_IP_MAX+1];
840 struct nf_conntrack_l3proto *l3proto;
843 ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
848 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
850 if (likely(l3proto->nlattr_to_tuple)) {
851 ret = nla_validate_nested(attr, CTA_IP_MAX,
852 l3proto->nla_policy);
854 ret = l3proto->nlattr_to_tuple(tb, tuple);
862 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
863 [CTA_PROTO_NUM] = { .type = NLA_U8 },
867 ctnetlink_parse_tuple_proto(struct nlattr *attr,
868 struct nf_conntrack_tuple *tuple)
870 struct nlattr *tb[CTA_PROTO_MAX+1];
871 struct nf_conntrack_l4proto *l4proto;
874 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
878 if (!tb[CTA_PROTO_NUM])
880 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
883 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
885 if (likely(l4proto->nlattr_to_tuple)) {
886 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
887 l4proto->nla_policy);
889 ret = l4proto->nlattr_to_tuple(tb, tuple);
897 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
898 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
899 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
903 ctnetlink_parse_tuple(const struct nlattr * const cda[],
904 struct nf_conntrack_tuple *tuple,
905 enum ctattr_type type, u_int8_t l3num)
907 struct nlattr *tb[CTA_TUPLE_MAX+1];
910 memset(tuple, 0, sizeof(*tuple));
912 err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
916 if (!tb[CTA_TUPLE_IP])
919 tuple->src.l3num = l3num;
921 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
925 if (!tb[CTA_TUPLE_PROTO])
928 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
932 /* orig and expect tuples get DIR_ORIGINAL */
933 if (type == CTA_TUPLE_REPLY)
934 tuple->dst.dir = IP_CT_DIR_REPLY;
936 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
942 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
945 #ifdef CONFIG_NF_CONNTRACK_ZONES
946 *zone = ntohs(nla_get_be16(attr));
956 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
957 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
958 .len = NF_CT_HELPER_NAME_LEN - 1 },
962 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
963 struct nlattr **helpinfo)
966 struct nlattr *tb[CTA_HELP_MAX+1];
968 err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
972 if (!tb[CTA_HELP_NAME])
975 *helper_name = nla_data(tb[CTA_HELP_NAME]);
977 if (tb[CTA_HELP_INFO])
978 *helpinfo = tb[CTA_HELP_INFO];
983 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
984 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
985 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
986 [CTA_STATUS] = { .type = NLA_U32 },
987 [CTA_PROTOINFO] = { .type = NLA_NESTED },
988 [CTA_HELP] = { .type = NLA_NESTED },
989 [CTA_NAT_SRC] = { .type = NLA_NESTED },
990 [CTA_TIMEOUT] = { .type = NLA_U32 },
991 [CTA_MARK] = { .type = NLA_U32 },
992 [CTA_ID] = { .type = NLA_U32 },
993 [CTA_NAT_DST] = { .type = NLA_NESTED },
994 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
995 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
996 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
997 [CTA_ZONE] = { .type = NLA_U16 },
998 [CTA_MARK_MASK] = { .type = NLA_U32 },
999 [CTA_LABELS] = { .type = NLA_BINARY,
1000 .len = NF_CT_LABELS_MAX_SIZE },
1001 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1002 .len = NF_CT_LABELS_MAX_SIZE },
1006 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
1007 const struct nlmsghdr *nlh,
1008 const struct nlattr * const cda[])
1010 struct net *net = sock_net(ctnl);
1011 struct nf_conntrack_tuple_hash *h;
1012 struct nf_conntrack_tuple tuple;
1014 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1015 u_int8_t u3 = nfmsg->nfgen_family;
1019 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1023 if (cda[CTA_TUPLE_ORIG])
1024 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1025 else if (cda[CTA_TUPLE_REPLY])
1026 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1028 /* Flush the whole table */
1029 nf_conntrack_flush_report(net,
1030 NETLINK_CB(skb).portid,
1038 h = nf_conntrack_find_get(net, zone, &tuple);
1042 ct = nf_ct_tuplehash_to_ctrack(h);
1045 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1046 if (id != (u32)(unsigned long)ct) {
1052 if (del_timer(&ct->timeout))
1053 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1061 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
1062 const struct nlmsghdr *nlh,
1063 const struct nlattr * const cda[])
1065 struct net *net = sock_net(ctnl);
1066 struct nf_conntrack_tuple_hash *h;
1067 struct nf_conntrack_tuple tuple;
1069 struct sk_buff *skb2 = NULL;
1070 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1071 u_int8_t u3 = nfmsg->nfgen_family;
1075 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1076 struct netlink_dump_control c = {
1077 .dump = ctnetlink_dump_table,
1078 .done = ctnetlink_done,
1080 #ifdef CONFIG_NF_CONNTRACK_MARK
1081 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1082 struct ctnetlink_dump_filter *filter;
1084 filter = kzalloc(sizeof(struct ctnetlink_dump_filter),
1089 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
1091 ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1095 return netlink_dump_start(ctnl, skb, nlh, &c);
1098 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1102 if (cda[CTA_TUPLE_ORIG])
1103 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1104 else if (cda[CTA_TUPLE_REPLY])
1105 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1112 h = nf_conntrack_find_get(net, zone, &tuple);
1116 ct = nf_ct_tuplehash_to_ctrack(h);
1119 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1126 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1127 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1133 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1142 /* this avoids a loop in nfnetlink. */
1143 return err == -EAGAIN ? -ENOBUFS : err;
1146 static int ctnetlink_done_list(struct netlink_callback *cb)
1149 nf_ct_put((struct nf_conn *)cb->args[1]);
1154 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1156 struct nf_conn *ct, *last;
1157 struct nf_conntrack_tuple_hash *h;
1158 struct hlist_nulls_node *n;
1159 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1160 u_int8_t l3proto = nfmsg->nfgen_family;
1163 struct hlist_nulls_head *list;
1164 struct net *net = sock_net(skb->sk);
1169 last = (struct nf_conn *)cb->args[1];
1171 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1172 struct ct_pcpu *pcpu;
1174 if (!cpu_possible(cpu))
1177 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1178 spin_lock_bh(&pcpu->lock);
1179 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1181 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1182 ct = nf_ct_tuplehash_to_ctrack(h);
1183 if (l3proto && nf_ct_l3num(ct) != l3proto)
1191 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1193 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1197 if (!atomic_inc_not_zero(&ct->ct_general.use))
1200 cb->args[1] = (unsigned long)ct;
1201 spin_unlock_bh(&pcpu->lock);
1209 spin_unlock_bh(&pcpu->lock);
1220 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1222 return ctnetlink_dump_list(skb, cb, true);
1226 ctnetlink_get_ct_dying(struct sock *ctnl, struct sk_buff *skb,
1227 const struct nlmsghdr *nlh,
1228 const struct nlattr * const cda[])
1230 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1231 struct netlink_dump_control c = {
1232 .dump = ctnetlink_dump_dying,
1233 .done = ctnetlink_done_list,
1235 return netlink_dump_start(ctnl, skb, nlh, &c);
1242 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1244 return ctnetlink_dump_list(skb, cb, false);
1248 ctnetlink_get_ct_unconfirmed(struct sock *ctnl, struct sk_buff *skb,
1249 const struct nlmsghdr *nlh,
1250 const struct nlattr * const cda[])
1252 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1253 struct netlink_dump_control c = {
1254 .dump = ctnetlink_dump_unconfirmed,
1255 .done = ctnetlink_done_list,
1257 return netlink_dump_start(ctnl, skb, nlh, &c);
1263 #ifdef CONFIG_NF_NAT_NEEDED
1265 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1266 enum nf_nat_manip_type manip,
1267 const struct nlattr *attr)
1269 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1272 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1273 if (!parse_nat_setup) {
1274 #ifdef CONFIG_MODULES
1276 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1277 if (request_module("nf-nat") < 0) {
1278 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1282 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1284 if (nfnetlink_parse_nat_setup_hook)
1290 err = parse_nat_setup(ct, manip, attr);
1291 if (err == -EAGAIN) {
1292 #ifdef CONFIG_MODULES
1294 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1295 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1296 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1300 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1311 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1314 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1315 d = ct->status ^ status;
1317 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1321 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1322 /* SEEN_REPLY bit can only be set */
1325 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1326 /* ASSURED bit can only be set */
1329 /* Be careful here, modifying NAT bits can screw up things,
1330 * so don't let users modify them directly if they don't pass
1332 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1337 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1339 #ifdef CONFIG_NF_NAT_NEEDED
1342 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1345 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1350 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1354 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1361 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1363 struct nf_conntrack_helper *helper;
1364 struct nf_conn_help *help = nfct_help(ct);
1365 char *helpname = NULL;
1366 struct nlattr *helpinfo = NULL;
1369 /* don't change helper of sibling connections */
1373 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1377 if (!strcmp(helpname, "")) {
1378 if (help && help->helper) {
1379 /* we had a helper before ... */
1380 nf_ct_remove_expectations(ct);
1381 RCU_INIT_POINTER(help->helper, NULL);
1387 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1388 nf_ct_protonum(ct));
1389 if (helper == NULL) {
1390 #ifdef CONFIG_MODULES
1391 spin_unlock_bh(&nf_conntrack_expect_lock);
1393 if (request_module("nfct-helper-%s", helpname) < 0) {
1394 spin_lock_bh(&nf_conntrack_expect_lock);
1398 spin_lock_bh(&nf_conntrack_expect_lock);
1399 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1400 nf_ct_protonum(ct));
1408 if (help->helper == helper) {
1409 /* update private helper data if allowed. */
1410 if (helper->from_nlattr)
1411 helper->from_nlattr(helpinfo, ct);
1417 /* we cannot set a helper for an existing conntrack */
1422 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1424 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1426 if (!del_timer(&ct->timeout))
1429 ct->timeout.expires = jiffies + timeout * HZ;
1430 add_timer(&ct->timeout);
1435 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1436 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1437 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1438 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1442 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1444 const struct nlattr *attr = cda[CTA_PROTOINFO];
1445 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1446 struct nf_conntrack_l4proto *l4proto;
1449 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1454 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1455 if (l4proto->from_nlattr)
1456 err = l4proto->from_nlattr(tb, ct);
1462 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1463 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1464 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1465 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1469 change_seq_adj(struct nf_ct_seqadj *seq, const struct nlattr * const attr)
1472 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1474 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1478 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1481 seq->correction_pos =
1482 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1484 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1487 seq->offset_before =
1488 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1490 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1494 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1500 ctnetlink_change_seq_adj(struct nf_conn *ct,
1501 const struct nlattr * const cda[])
1503 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1509 if (cda[CTA_SEQ_ADJ_ORIG]) {
1510 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1511 cda[CTA_SEQ_ADJ_ORIG]);
1515 ct->status |= IPS_SEQ_ADJUST;
1518 if (cda[CTA_SEQ_ADJ_REPLY]) {
1519 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1520 cda[CTA_SEQ_ADJ_REPLY]);
1524 ct->status |= IPS_SEQ_ADJUST;
1531 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1533 #ifdef CONFIG_NF_CONNTRACK_LABELS
1534 size_t len = nla_len(cda[CTA_LABELS]);
1535 const void *mask = cda[CTA_LABELS_MASK];
1537 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1541 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1542 nla_len(cda[CTA_LABELS_MASK]) != len)
1544 mask = nla_data(cda[CTA_LABELS_MASK]);
1549 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1556 ctnetlink_change_conntrack(struct nf_conn *ct,
1557 const struct nlattr * const cda[])
1561 /* only allow NAT changes and master assignation for new conntracks */
1562 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1565 if (cda[CTA_HELP]) {
1566 err = ctnetlink_change_helper(ct, cda);
1571 if (cda[CTA_TIMEOUT]) {
1572 err = ctnetlink_change_timeout(ct, cda);
1577 if (cda[CTA_STATUS]) {
1578 err = ctnetlink_change_status(ct, cda);
1583 if (cda[CTA_PROTOINFO]) {
1584 err = ctnetlink_change_protoinfo(ct, cda);
1589 #if defined(CONFIG_NF_CONNTRACK_MARK)
1591 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1594 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1595 err = ctnetlink_change_seq_adj(ct, cda);
1600 if (cda[CTA_LABELS]) {
1601 err = ctnetlink_attach_labels(ct, cda);
1609 static struct nf_conn *
1610 ctnetlink_create_conntrack(struct net *net, u16 zone,
1611 const struct nlattr * const cda[],
1612 struct nf_conntrack_tuple *otuple,
1613 struct nf_conntrack_tuple *rtuple,
1618 struct nf_conntrack_helper *helper;
1619 struct nf_conn_tstamp *tstamp;
1621 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1623 return ERR_PTR(-ENOMEM);
1625 if (!cda[CTA_TIMEOUT])
1627 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1629 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1632 if (cda[CTA_HELP]) {
1633 char *helpname = NULL;
1634 struct nlattr *helpinfo = NULL;
1636 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1640 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1641 nf_ct_protonum(ct));
1642 if (helper == NULL) {
1644 #ifdef CONFIG_MODULES
1645 if (request_module("nfct-helper-%s", helpname) < 0) {
1651 helper = __nf_conntrack_helper_find(helpname,
1653 nf_ct_protonum(ct));
1663 struct nf_conn_help *help;
1665 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1670 /* set private helper data if allowed. */
1671 if (helper->from_nlattr)
1672 helper->from_nlattr(helpinfo, ct);
1674 /* not in hash table yet so not strictly necessary */
1675 RCU_INIT_POINTER(help->helper, helper);
1678 /* try an implicit helper assignation */
1679 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1684 err = ctnetlink_setup_nat(ct, cda);
1688 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1689 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1690 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1691 nf_ct_labels_ext_add(ct);
1693 /* we must add conntrack extensions before confirmation. */
1694 ct->status |= IPS_CONFIRMED;
1696 if (cda[CTA_STATUS]) {
1697 err = ctnetlink_change_status(ct, cda);
1702 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1703 err = ctnetlink_change_seq_adj(ct, cda);
1708 memset(&ct->proto, 0, sizeof(ct->proto));
1709 if (cda[CTA_PROTOINFO]) {
1710 err = ctnetlink_change_protoinfo(ct, cda);
1715 #if defined(CONFIG_NF_CONNTRACK_MARK)
1717 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1720 /* setup master conntrack: this is a confirmed expectation */
1721 if (cda[CTA_TUPLE_MASTER]) {
1722 struct nf_conntrack_tuple master;
1723 struct nf_conntrack_tuple_hash *master_h;
1724 struct nf_conn *master_ct;
1726 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1730 master_h = nf_conntrack_find_get(net, zone, &master);
1731 if (master_h == NULL) {
1735 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1736 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1737 ct->master = master_ct;
1739 tstamp = nf_conn_tstamp_find(ct);
1741 tstamp->start = ktime_to_ns(ktime_get_real());
1743 err = nf_conntrack_hash_check_insert(ct);
1754 nf_conntrack_free(ct);
1755 return ERR_PTR(err);
1759 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1760 const struct nlmsghdr *nlh,
1761 const struct nlattr * const cda[])
1763 struct net *net = sock_net(ctnl);
1764 struct nf_conntrack_tuple otuple, rtuple;
1765 struct nf_conntrack_tuple_hash *h = NULL;
1766 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1768 u_int8_t u3 = nfmsg->nfgen_family;
1772 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1776 if (cda[CTA_TUPLE_ORIG]) {
1777 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1782 if (cda[CTA_TUPLE_REPLY]) {
1783 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1788 if (cda[CTA_TUPLE_ORIG])
1789 h = nf_conntrack_find_get(net, zone, &otuple);
1790 else if (cda[CTA_TUPLE_REPLY])
1791 h = nf_conntrack_find_get(net, zone, &rtuple);
1795 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1796 enum ip_conntrack_events events;
1798 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1801 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1807 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1808 events = IPCT_RELATED;
1812 if (cda[CTA_LABELS] &&
1813 ctnetlink_attach_labels(ct, cda) == 0)
1814 events |= (1 << IPCT_LABEL);
1816 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1817 (1 << IPCT_ASSURED) |
1818 (1 << IPCT_HELPER) |
1819 (1 << IPCT_PROTOINFO) |
1820 (1 << IPCT_SEQADJ) |
1821 (1 << IPCT_MARK) | events,
1822 ct, NETLINK_CB(skb).portid,
1829 /* implicit 'else' */
1832 ct = nf_ct_tuplehash_to_ctrack(h);
1833 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1834 spin_lock_bh(&nf_conntrack_expect_lock);
1835 err = ctnetlink_change_conntrack(ct, cda);
1836 spin_unlock_bh(&nf_conntrack_expect_lock);
1838 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1839 (1 << IPCT_ASSURED) |
1840 (1 << IPCT_HELPER) |
1842 (1 << IPCT_PROTOINFO) |
1843 (1 << IPCT_SEQADJ) |
1845 ct, NETLINK_CB(skb).portid,
1855 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1856 __u16 cpu, const struct ip_conntrack_stat *st)
1858 struct nlmsghdr *nlh;
1859 struct nfgenmsg *nfmsg;
1860 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1862 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1863 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1867 nfmsg = nlmsg_data(nlh);
1868 nfmsg->nfgen_family = AF_UNSPEC;
1869 nfmsg->version = NFNETLINK_V0;
1870 nfmsg->res_id = htons(cpu);
1872 if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1873 nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1874 nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
1875 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1876 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1877 nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
1878 nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
1879 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1880 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1881 htonl(st->insert_failed)) ||
1882 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1883 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1884 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1885 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1886 htonl(st->search_restart)))
1887 goto nla_put_failure;
1889 nlmsg_end(skb, nlh);
1894 nlmsg_cancel(skb, nlh);
1899 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
1902 struct net *net = sock_net(skb->sk);
1904 if (cb->args[0] == nr_cpu_ids)
1907 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1908 const struct ip_conntrack_stat *st;
1910 if (!cpu_possible(cpu))
1913 st = per_cpu_ptr(net->ct.stat, cpu);
1914 if (ctnetlink_ct_stat_cpu_fill_info(skb,
1915 NETLINK_CB(cb->skb).portid,
1926 ctnetlink_stat_ct_cpu(struct sock *ctnl, struct sk_buff *skb,
1927 const struct nlmsghdr *nlh,
1928 const struct nlattr * const cda[])
1930 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1931 struct netlink_dump_control c = {
1932 .dump = ctnetlink_ct_stat_cpu_dump,
1934 return netlink_dump_start(ctnl, skb, nlh, &c);
1941 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
1944 struct nlmsghdr *nlh;
1945 struct nfgenmsg *nfmsg;
1946 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1947 unsigned int nr_conntracks = atomic_read(&net->ct.count);
1949 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
1950 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1954 nfmsg = nlmsg_data(nlh);
1955 nfmsg->nfgen_family = AF_UNSPEC;
1956 nfmsg->version = NFNETLINK_V0;
1959 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
1960 goto nla_put_failure;
1962 nlmsg_end(skb, nlh);
1967 nlmsg_cancel(skb, nlh);
1972 ctnetlink_stat_ct(struct sock *ctnl, struct sk_buff *skb,
1973 const struct nlmsghdr *nlh,
1974 const struct nlattr * const cda[])
1976 struct sk_buff *skb2;
1979 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1983 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
1985 NFNL_MSG_TYPE(nlh->nlmsg_type),
1990 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1999 /* this avoids a loop in nfnetlink. */
2000 return err == -EAGAIN ? -ENOBUFS : err;
2003 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2004 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2005 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2006 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2007 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2008 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2009 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2010 .len = NF_CT_HELPER_NAME_LEN - 1 },
2011 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2012 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2013 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2014 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2015 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2018 static struct nf_conntrack_expect *
2019 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2020 struct nf_conntrack_helper *helper,
2021 struct nf_conntrack_tuple *tuple,
2022 struct nf_conntrack_tuple *mask);
2024 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
2026 ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
2028 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2029 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2030 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2031 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2032 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2033 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2034 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2035 + nla_total_size(0) /* CTA_PROTOINFO */
2036 + nla_total_size(0) /* CTA_HELP */
2037 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2038 + ctnetlink_secctx_size(ct)
2039 #ifdef CONFIG_NF_NAT_NEEDED
2040 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2041 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2043 #ifdef CONFIG_NF_CONNTRACK_MARK
2044 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2046 #ifdef CONFIG_NF_CONNTRACK_ZONES
2047 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE */
2049 + ctnetlink_proto_size(ct)
2054 ctnetlink_nfqueue_build(struct sk_buff *skb, struct nf_conn *ct)
2056 struct nlattr *nest_parms;
2059 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2061 goto nla_put_failure;
2062 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2063 goto nla_put_failure;
2064 nla_nest_end(skb, nest_parms);
2066 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2068 goto nla_put_failure;
2069 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2070 goto nla_put_failure;
2071 nla_nest_end(skb, nest_parms);
2073 if (nf_ct_zone(ct)) {
2074 if (nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
2075 goto nla_put_failure;
2078 if (ctnetlink_dump_id(skb, ct) < 0)
2079 goto nla_put_failure;
2081 if (ctnetlink_dump_status(skb, ct) < 0)
2082 goto nla_put_failure;
2084 if (ctnetlink_dump_timeout(skb, ct) < 0)
2085 goto nla_put_failure;
2087 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2088 goto nla_put_failure;
2090 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2091 goto nla_put_failure;
2093 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2094 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2095 goto nla_put_failure;
2097 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2098 goto nla_put_failure;
2100 if ((ct->status & IPS_SEQ_ADJUST) &&
2101 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2102 goto nla_put_failure;
2104 #ifdef CONFIG_NF_CONNTRACK_MARK
2105 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2106 goto nla_put_failure;
2108 if (ctnetlink_dump_labels(skb, ct) < 0)
2109 goto nla_put_failure;
2119 ctnetlink_nfqueue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2123 if (cda[CTA_TIMEOUT]) {
2124 err = ctnetlink_change_timeout(ct, cda);
2128 if (cda[CTA_STATUS]) {
2129 err = ctnetlink_change_status(ct, cda);
2133 if (cda[CTA_HELP]) {
2134 err = ctnetlink_change_helper(ct, cda);
2138 if (cda[CTA_LABELS]) {
2139 err = ctnetlink_attach_labels(ct, cda);
2143 #if defined(CONFIG_NF_CONNTRACK_MARK)
2144 if (cda[CTA_MARK]) {
2145 u32 mask = 0, mark, newmark;
2146 if (cda[CTA_MARK_MASK])
2147 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2149 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2150 newmark = (ct->mark & mask) ^ mark;
2151 if (newmark != ct->mark)
2159 ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
2161 struct nlattr *cda[CTA_MAX+1];
2164 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2168 spin_lock_bh(&nf_conntrack_expect_lock);
2169 ret = ctnetlink_nfqueue_parse_ct((const struct nlattr **)cda, ct);
2170 spin_unlock_bh(&nf_conntrack_expect_lock);
2175 static int ctnetlink_nfqueue_exp_parse(const struct nlattr * const *cda,
2176 const struct nf_conn *ct,
2177 struct nf_conntrack_tuple *tuple,
2178 struct nf_conntrack_tuple *mask)
2182 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2187 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2192 ctnetlink_nfqueue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2193 u32 portid, u32 report)
2195 struct nlattr *cda[CTA_EXPECT_MAX+1];
2196 struct nf_conntrack_tuple tuple, mask;
2197 struct nf_conntrack_helper *helper = NULL;
2198 struct nf_conntrack_expect *exp;
2201 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2205 err = ctnetlink_nfqueue_exp_parse((const struct nlattr * const *)cda,
2210 if (cda[CTA_EXPECT_HELP_NAME]) {
2211 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2213 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2214 nf_ct_protonum(ct));
2219 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2220 helper, &tuple, &mask);
2222 return PTR_ERR(exp);
2224 err = nf_ct_expect_related_report(exp, portid, report);
2226 nf_ct_expect_put(exp);
2233 static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
2234 .build_size = ctnetlink_nfqueue_build_size,
2235 .build = ctnetlink_nfqueue_build,
2236 .parse = ctnetlink_nfqueue_parse,
2237 .attach_expect = ctnetlink_nfqueue_attach_expect,
2238 .seq_adjust = nf_ct_tcp_seqadj_set,
2240 #endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
2242 /***********************************************************************
2244 ***********************************************************************/
2247 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2248 const struct nf_conntrack_tuple *tuple,
2249 enum ctattr_expect type)
2251 struct nlattr *nest_parms;
2253 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2255 goto nla_put_failure;
2256 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2257 goto nla_put_failure;
2258 nla_nest_end(skb, nest_parms);
2267 ctnetlink_exp_dump_mask(struct sk_buff *skb,
2268 const struct nf_conntrack_tuple *tuple,
2269 const struct nf_conntrack_tuple_mask *mask)
2272 struct nf_conntrack_l3proto *l3proto;
2273 struct nf_conntrack_l4proto *l4proto;
2274 struct nf_conntrack_tuple m;
2275 struct nlattr *nest_parms;
2277 memset(&m, 0xFF, sizeof(m));
2278 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2279 m.src.u.all = mask->src.u.all;
2280 m.dst.protonum = tuple->dst.protonum;
2282 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2284 goto nla_put_failure;
2287 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2288 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2290 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2291 tuple->dst.protonum);
2292 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2296 if (unlikely(ret < 0))
2297 goto nla_put_failure;
2299 nla_nest_end(skb, nest_parms);
2307 static const union nf_inet_addr any_addr;
2310 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2311 const struct nf_conntrack_expect *exp)
2313 struct nf_conn *master = exp->master;
2314 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2315 struct nf_conn_help *help;
2316 #ifdef CONFIG_NF_NAT_NEEDED
2317 struct nlattr *nest_parms;
2318 struct nf_conntrack_tuple nat_tuple = {};
2320 struct nf_ct_helper_expectfn *expfn;
2325 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2326 goto nla_put_failure;
2327 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2328 goto nla_put_failure;
2329 if (ctnetlink_exp_dump_tuple(skb,
2330 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2331 CTA_EXPECT_MASTER) < 0)
2332 goto nla_put_failure;
2334 #ifdef CONFIG_NF_NAT_NEEDED
2335 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2336 exp->saved_proto.all) {
2337 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2339 goto nla_put_failure;
2341 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2342 goto nla_put_failure;
2344 nat_tuple.src.l3num = nf_ct_l3num(master);
2345 nat_tuple.src.u3 = exp->saved_addr;
2346 nat_tuple.dst.protonum = nf_ct_protonum(master);
2347 nat_tuple.src.u = exp->saved_proto;
2349 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2350 CTA_EXPECT_NAT_TUPLE) < 0)
2351 goto nla_put_failure;
2352 nla_nest_end(skb, nest_parms);
2355 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2356 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2357 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2358 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2359 goto nla_put_failure;
2360 help = nfct_help(master);
2362 struct nf_conntrack_helper *helper;
2364 helper = rcu_dereference(help->helper);
2366 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2367 goto nla_put_failure;
2369 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2370 if (expfn != NULL &&
2371 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2372 goto nla_put_failure;
2381 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2382 int event, const struct nf_conntrack_expect *exp)
2384 struct nlmsghdr *nlh;
2385 struct nfgenmsg *nfmsg;
2386 unsigned int flags = portid ? NLM_F_MULTI : 0;
2388 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2389 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2393 nfmsg = nlmsg_data(nlh);
2394 nfmsg->nfgen_family = exp->tuple.src.l3num;
2395 nfmsg->version = NFNETLINK_V0;
2398 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2399 goto nla_put_failure;
2401 nlmsg_end(skb, nlh);
2406 nlmsg_cancel(skb, nlh);
2410 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2412 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2414 struct nf_conntrack_expect *exp = item->exp;
2415 struct net *net = nf_ct_exp_net(exp);
2416 struct nlmsghdr *nlh;
2417 struct nfgenmsg *nfmsg;
2418 struct sk_buff *skb;
2419 unsigned int type, group;
2422 if (events & (1 << IPEXP_DESTROY)) {
2423 type = IPCTNL_MSG_EXP_DELETE;
2424 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2425 } else if (events & (1 << IPEXP_NEW)) {
2426 type = IPCTNL_MSG_EXP_NEW;
2427 flags = NLM_F_CREATE|NLM_F_EXCL;
2428 group = NFNLGRP_CONNTRACK_EXP_NEW;
2432 if (!item->report && !nfnetlink_has_listeners(net, group))
2435 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2439 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2440 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2444 nfmsg = nlmsg_data(nlh);
2445 nfmsg->nfgen_family = exp->tuple.src.l3num;
2446 nfmsg->version = NFNETLINK_V0;
2450 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2451 goto nla_put_failure;
2454 nlmsg_end(skb, nlh);
2455 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2460 nlmsg_cancel(skb, nlh);
2464 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2468 static int ctnetlink_exp_done(struct netlink_callback *cb)
2471 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2476 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2478 struct net *net = sock_net(skb->sk);
2479 struct nf_conntrack_expect *exp, *last;
2480 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2481 u_int8_t l3proto = nfmsg->nfgen_family;
2484 last = (struct nf_conntrack_expect *)cb->args[1];
2485 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2487 hlist_for_each_entry(exp, &net->ct.expect_hash[cb->args[0]],
2489 if (l3proto && exp->tuple.src.l3num != l3proto)
2496 if (ctnetlink_exp_fill_info(skb,
2497 NETLINK_CB(cb->skb).portid,
2501 if (!atomic_inc_not_zero(&exp->use))
2503 cb->args[1] = (unsigned long)exp;
2515 nf_ct_expect_put(last);
2521 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2523 struct nf_conntrack_expect *exp, *last;
2524 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2525 struct nf_conn *ct = cb->data;
2526 struct nf_conn_help *help = nfct_help(ct);
2527 u_int8_t l3proto = nfmsg->nfgen_family;
2533 last = (struct nf_conntrack_expect *)cb->args[1];
2535 hlist_for_each_entry(exp, &help->expectations, lnode) {
2536 if (l3proto && exp->tuple.src.l3num != l3proto)
2543 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2547 if (!atomic_inc_not_zero(&exp->use))
2549 cb->args[1] = (unsigned long)exp;
2561 nf_ct_expect_put(last);
2566 static int ctnetlink_dump_exp_ct(struct sock *ctnl, struct sk_buff *skb,
2567 const struct nlmsghdr *nlh,
2568 const struct nlattr * const cda[])
2571 struct net *net = sock_net(ctnl);
2572 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2573 u_int8_t u3 = nfmsg->nfgen_family;
2574 struct nf_conntrack_tuple tuple;
2575 struct nf_conntrack_tuple_hash *h;
2578 struct netlink_dump_control c = {
2579 .dump = ctnetlink_exp_ct_dump_table,
2580 .done = ctnetlink_exp_done,
2583 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2587 if (cda[CTA_EXPECT_ZONE]) {
2588 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2593 h = nf_conntrack_find_get(net, zone, &tuple);
2597 ct = nf_ct_tuplehash_to_ctrack(h);
2600 err = netlink_dump_start(ctnl, skb, nlh, &c);
2607 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
2608 const struct nlmsghdr *nlh,
2609 const struct nlattr * const cda[])
2611 struct net *net = sock_net(ctnl);
2612 struct nf_conntrack_tuple tuple;
2613 struct nf_conntrack_expect *exp;
2614 struct sk_buff *skb2;
2615 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2616 u_int8_t u3 = nfmsg->nfgen_family;
2620 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2621 if (cda[CTA_EXPECT_MASTER])
2622 return ctnetlink_dump_exp_ct(ctnl, skb, nlh, cda);
2624 struct netlink_dump_control c = {
2625 .dump = ctnetlink_exp_dump_table,
2626 .done = ctnetlink_exp_done,
2628 return netlink_dump_start(ctnl, skb, nlh, &c);
2632 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2636 if (cda[CTA_EXPECT_TUPLE])
2637 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2638 else if (cda[CTA_EXPECT_MASTER])
2639 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2646 exp = nf_ct_expect_find_get(net, zone, &tuple);
2650 if (cda[CTA_EXPECT_ID]) {
2651 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2652 if (ntohl(id) != (u32)(unsigned long)exp) {
2653 nf_ct_expect_put(exp);
2659 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2661 nf_ct_expect_put(exp);
2666 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2667 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2669 nf_ct_expect_put(exp);
2673 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2682 /* this avoids a loop in nfnetlink. */
2683 return err == -EAGAIN ? -ENOBUFS : err;
2687 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
2688 const struct nlmsghdr *nlh,
2689 const struct nlattr * const cda[])
2691 struct net *net = sock_net(ctnl);
2692 struct nf_conntrack_expect *exp;
2693 struct nf_conntrack_tuple tuple;
2694 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2695 struct hlist_node *next;
2696 u_int8_t u3 = nfmsg->nfgen_family;
2701 if (cda[CTA_EXPECT_TUPLE]) {
2702 /* delete a single expect by tuple */
2703 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2707 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2711 /* bump usage count to 2 */
2712 exp = nf_ct_expect_find_get(net, zone, &tuple);
2716 if (cda[CTA_EXPECT_ID]) {
2717 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2718 if (ntohl(id) != (u32)(unsigned long)exp) {
2719 nf_ct_expect_put(exp);
2724 /* after list removal, usage count == 1 */
2725 spin_lock_bh(&nf_conntrack_expect_lock);
2726 if (del_timer(&exp->timeout)) {
2727 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2729 nf_ct_expect_put(exp);
2731 spin_unlock_bh(&nf_conntrack_expect_lock);
2732 /* have to put what we 'get' above.
2733 * after this line usage count == 0 */
2734 nf_ct_expect_put(exp);
2735 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2736 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2737 struct nf_conn_help *m_help;
2739 /* delete all expectations for this helper */
2740 spin_lock_bh(&nf_conntrack_expect_lock);
2741 for (i = 0; i < nf_ct_expect_hsize; i++) {
2742 hlist_for_each_entry_safe(exp, next,
2743 &net->ct.expect_hash[i],
2745 m_help = nfct_help(exp->master);
2746 if (!strcmp(m_help->helper->name, name) &&
2747 del_timer(&exp->timeout)) {
2748 nf_ct_unlink_expect_report(exp,
2749 NETLINK_CB(skb).portid,
2751 nf_ct_expect_put(exp);
2755 spin_unlock_bh(&nf_conntrack_expect_lock);
2757 /* This basically means we have to flush everything*/
2758 spin_lock_bh(&nf_conntrack_expect_lock);
2759 for (i = 0; i < nf_ct_expect_hsize; i++) {
2760 hlist_for_each_entry_safe(exp, next,
2761 &net->ct.expect_hash[i],
2763 if (del_timer(&exp->timeout)) {
2764 nf_ct_unlink_expect_report(exp,
2765 NETLINK_CB(skb).portid,
2767 nf_ct_expect_put(exp);
2771 spin_unlock_bh(&nf_conntrack_expect_lock);
2777 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2778 const struct nlattr * const cda[])
2780 if (cda[CTA_EXPECT_TIMEOUT]) {
2781 if (!del_timer(&x->timeout))
2784 x->timeout.expires = jiffies +
2785 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2786 add_timer(&x->timeout);
2791 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2792 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2793 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2797 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2798 struct nf_conntrack_expect *exp,
2801 #ifdef CONFIG_NF_NAT_NEEDED
2802 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2803 struct nf_conntrack_tuple nat_tuple = {};
2806 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2810 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2813 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2814 &nat_tuple, CTA_EXPECT_NAT_TUPLE, u3);
2818 exp->saved_addr = nat_tuple.src.u3;
2819 exp->saved_proto = nat_tuple.src.u;
2820 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2828 static struct nf_conntrack_expect *
2829 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
2830 struct nf_conntrack_helper *helper,
2831 struct nf_conntrack_tuple *tuple,
2832 struct nf_conntrack_tuple *mask)
2834 u_int32_t class = 0;
2835 struct nf_conntrack_expect *exp;
2836 struct nf_conn_help *help;
2839 if (cda[CTA_EXPECT_CLASS] && helper) {
2840 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
2841 if (class > helper->expect_class_max)
2842 return ERR_PTR(-EINVAL);
2844 exp = nf_ct_expect_alloc(ct);
2846 return ERR_PTR(-ENOMEM);
2848 help = nfct_help(ct);
2850 if (!cda[CTA_EXPECT_TIMEOUT]) {
2854 exp->timeout.expires =
2855 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2857 exp->flags = NF_CT_EXPECT_USERSPACE;
2858 if (cda[CTA_EXPECT_FLAGS]) {
2860 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2863 if (cda[CTA_EXPECT_FLAGS]) {
2864 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2865 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2869 if (cda[CTA_EXPECT_FN]) {
2870 const char *name = nla_data(cda[CTA_EXPECT_FN]);
2871 struct nf_ct_helper_expectfn *expfn;
2873 expfn = nf_ct_helper_expectfn_find_by_name(name);
2874 if (expfn == NULL) {
2878 exp->expectfn = expfn->expectfn;
2880 exp->expectfn = NULL;
2884 exp->helper = helper;
2885 exp->tuple = *tuple;
2886 exp->mask.src.u3 = mask->src.u3;
2887 exp->mask.src.u.all = mask->src.u.all;
2889 if (cda[CTA_EXPECT_NAT]) {
2890 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
2891 exp, nf_ct_l3num(ct));
2897 nf_ct_expect_put(exp);
2898 return ERR_PTR(err);
2902 ctnetlink_create_expect(struct net *net, u16 zone,
2903 const struct nlattr * const cda[],
2904 u_int8_t u3, u32 portid, int report)
2906 struct nf_conntrack_tuple tuple, mask, master_tuple;
2907 struct nf_conntrack_tuple_hash *h = NULL;
2908 struct nf_conntrack_helper *helper = NULL;
2909 struct nf_conntrack_expect *exp;
2913 /* caller guarantees that those three CTA_EXPECT_* exist */
2914 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2917 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2920 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2924 /* Look for master conntrack of this expectation */
2925 h = nf_conntrack_find_get(net, zone, &master_tuple);
2928 ct = nf_ct_tuplehash_to_ctrack(h);
2930 if (cda[CTA_EXPECT_HELP_NAME]) {
2931 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2933 helper = __nf_conntrack_helper_find(helpname, u3,
2934 nf_ct_protonum(ct));
2935 if (helper == NULL) {
2936 #ifdef CONFIG_MODULES
2937 if (request_module("nfct-helper-%s", helpname) < 0) {
2941 helper = __nf_conntrack_helper_find(helpname, u3,
2942 nf_ct_protonum(ct));
2953 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
2959 err = nf_ct_expect_related_report(exp, portid, report);
2965 nf_ct_expect_put(exp);
2972 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2973 const struct nlmsghdr *nlh,
2974 const struct nlattr * const cda[])
2976 struct net *net = sock_net(ctnl);
2977 struct nf_conntrack_tuple tuple;
2978 struct nf_conntrack_expect *exp;
2979 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2980 u_int8_t u3 = nfmsg->nfgen_family;
2984 if (!cda[CTA_EXPECT_TUPLE]
2985 || !cda[CTA_EXPECT_MASK]
2986 || !cda[CTA_EXPECT_MASTER])
2989 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2993 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2997 spin_lock_bh(&nf_conntrack_expect_lock);
2998 exp = __nf_ct_expect_find(net, zone, &tuple);
3001 spin_unlock_bh(&nf_conntrack_expect_lock);
3003 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3004 err = ctnetlink_create_expect(net, zone, cda,
3006 NETLINK_CB(skb).portid,
3013 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3014 err = ctnetlink_change_expect(exp, cda);
3015 spin_unlock_bh(&nf_conntrack_expect_lock);
3021 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3022 const struct ip_conntrack_stat *st)
3024 struct nlmsghdr *nlh;
3025 struct nfgenmsg *nfmsg;
3026 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3028 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
3029 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3033 nfmsg = nlmsg_data(nlh);
3034 nfmsg->nfgen_family = AF_UNSPEC;
3035 nfmsg->version = NFNETLINK_V0;
3036 nfmsg->res_id = htons(cpu);
3038 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3039 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3040 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3041 goto nla_put_failure;
3043 nlmsg_end(skb, nlh);
3048 nlmsg_cancel(skb, nlh);
3053 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3056 struct net *net = sock_net(skb->sk);
3058 if (cb->args[0] == nr_cpu_ids)
3061 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3062 const struct ip_conntrack_stat *st;
3064 if (!cpu_possible(cpu))
3067 st = per_cpu_ptr(net->ct.stat, cpu);
3068 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3079 ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
3080 const struct nlmsghdr *nlh,
3081 const struct nlattr * const cda[])
3083 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3084 struct netlink_dump_control c = {
3085 .dump = ctnetlink_exp_stat_cpu_dump,
3087 return netlink_dump_start(ctnl, skb, nlh, &c);
3093 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3094 static struct nf_ct_event_notifier ctnl_notifier = {
3095 .fcn = ctnetlink_conntrack_event,
3098 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3099 .fcn = ctnetlink_expect_event,
3103 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3104 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3105 .attr_count = CTA_MAX,
3106 .policy = ct_nla_policy },
3107 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3108 .attr_count = CTA_MAX,
3109 .policy = ct_nla_policy },
3110 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3111 .attr_count = CTA_MAX,
3112 .policy = ct_nla_policy },
3113 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3114 .attr_count = CTA_MAX,
3115 .policy = ct_nla_policy },
3116 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3117 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3118 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3119 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3122 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3123 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3124 .attr_count = CTA_EXPECT_MAX,
3125 .policy = exp_nla_policy },
3126 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3127 .attr_count = CTA_EXPECT_MAX,
3128 .policy = exp_nla_policy },
3129 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3130 .attr_count = CTA_EXPECT_MAX,
3131 .policy = exp_nla_policy },
3132 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3135 static const struct nfnetlink_subsystem ctnl_subsys = {
3136 .name = "conntrack",
3137 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3138 .cb_count = IPCTNL_MSG_MAX,
3142 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3143 .name = "conntrack_expect",
3144 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3145 .cb_count = IPCTNL_MSG_EXP_MAX,
3149 MODULE_ALIAS("ip_conntrack_netlink");
3150 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3151 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3153 static int __net_init ctnetlink_net_init(struct net *net)
3155 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3158 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3160 pr_err("ctnetlink_init: cannot register notifier.\n");
3164 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3166 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3167 goto err_unreg_notifier;
3172 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3174 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3180 static void ctnetlink_net_exit(struct net *net)
3182 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3183 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3184 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3188 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3192 list_for_each_entry(net, net_exit_list, exit_list)
3193 ctnetlink_net_exit(net);
3196 static struct pernet_operations ctnetlink_net_ops = {
3197 .init = ctnetlink_net_init,
3198 .exit_batch = ctnetlink_net_exit_batch,
3201 static int __init ctnetlink_init(void)
3205 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3206 ret = nfnetlink_subsys_register(&ctnl_subsys);
3208 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3212 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3214 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3215 goto err_unreg_subsys;
3218 ret = register_pernet_subsys(&ctnetlink_net_ops);
3220 pr_err("ctnetlink_init: cannot register pernet operations\n");
3221 goto err_unreg_exp_subsys;
3223 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3224 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3225 RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
3229 err_unreg_exp_subsys:
3230 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3232 nfnetlink_subsys_unregister(&ctnl_subsys);
3237 static void __exit ctnetlink_exit(void)
3239 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3241 unregister_pernet_subsys(&ctnetlink_net_ops);
3242 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3243 nfnetlink_subsys_unregister(&ctnl_subsys);
3244 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3245 RCU_INIT_POINTER(nfq_ct_hook, NULL);
3249 module_init(ctnetlink_init);
3250 module_exit(ctnetlink_exit);