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]);
752 struct ctnetlink_filter {
759 static struct ctnetlink_filter *
760 ctnetlink_alloc_filter(const struct nlattr * const cda[])
762 #ifdef CONFIG_NF_CONNTRACK_MARK
763 struct ctnetlink_filter *filter;
765 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
767 return ERR_PTR(-ENOMEM);
769 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
770 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
774 return ERR_PTR(-EOPNOTSUPP);
778 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
780 struct ctnetlink_filter *filter = data;
785 #ifdef CONFIG_NF_CONNTRACK_MARK
786 if ((ct->mark & filter->mark.mask) == filter->mark.val)
794 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
796 struct net *net = sock_net(skb->sk);
797 struct nf_conn *ct, *last;
798 struct nf_conntrack_tuple_hash *h;
799 struct hlist_nulls_node *n;
800 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
801 u_int8_t l3proto = nfmsg->nfgen_family;
805 last = (struct nf_conn *)cb->args[1];
808 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
810 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
812 if (cb->args[0] >= net->ct.htable_size) {
816 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
818 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
820 ct = nf_ct_tuplehash_to_ctrack(h);
821 /* Dump entries of a given L3 protocol number.
822 * If it is not specified, ie. l3proto == 0,
823 * then dump everything. */
824 if (l3proto && nf_ct_l3num(ct) != l3proto)
831 if (!ctnetlink_filter_match(ct, cb->data))
836 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
838 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
842 nf_conntrack_get(&ct->ct_general);
843 cb->args[1] = (unsigned long)ct;
863 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
865 struct nlattr *tb[CTA_IP_MAX+1];
866 struct nf_conntrack_l3proto *l3proto;
869 ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
874 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
876 if (likely(l3proto->nlattr_to_tuple)) {
877 ret = nla_validate_nested(attr, CTA_IP_MAX,
878 l3proto->nla_policy);
880 ret = l3proto->nlattr_to_tuple(tb, tuple);
888 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
889 [CTA_PROTO_NUM] = { .type = NLA_U8 },
893 ctnetlink_parse_tuple_proto(struct nlattr *attr,
894 struct nf_conntrack_tuple *tuple)
896 struct nlattr *tb[CTA_PROTO_MAX+1];
897 struct nf_conntrack_l4proto *l4proto;
900 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
904 if (!tb[CTA_PROTO_NUM])
906 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
909 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
911 if (likely(l4proto->nlattr_to_tuple)) {
912 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
913 l4proto->nla_policy);
915 ret = l4proto->nlattr_to_tuple(tb, tuple);
923 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
924 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
925 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
929 ctnetlink_parse_tuple(const struct nlattr * const cda[],
930 struct nf_conntrack_tuple *tuple,
931 enum ctattr_type type, u_int8_t l3num)
933 struct nlattr *tb[CTA_TUPLE_MAX+1];
936 memset(tuple, 0, sizeof(*tuple));
938 err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
942 if (!tb[CTA_TUPLE_IP])
945 tuple->src.l3num = l3num;
947 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
951 if (!tb[CTA_TUPLE_PROTO])
954 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
958 /* orig and expect tuples get DIR_ORIGINAL */
959 if (type == CTA_TUPLE_REPLY)
960 tuple->dst.dir = IP_CT_DIR_REPLY;
962 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
968 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
971 #ifdef CONFIG_NF_CONNTRACK_ZONES
972 *zone = ntohs(nla_get_be16(attr));
982 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
983 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
984 .len = NF_CT_HELPER_NAME_LEN - 1 },
988 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
989 struct nlattr **helpinfo)
992 struct nlattr *tb[CTA_HELP_MAX+1];
994 err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
998 if (!tb[CTA_HELP_NAME])
1001 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1003 if (tb[CTA_HELP_INFO])
1004 *helpinfo = tb[CTA_HELP_INFO];
1009 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1010 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1011 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1012 [CTA_STATUS] = { .type = NLA_U32 },
1013 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1014 [CTA_HELP] = { .type = NLA_NESTED },
1015 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1016 [CTA_TIMEOUT] = { .type = NLA_U32 },
1017 [CTA_MARK] = { .type = NLA_U32 },
1018 [CTA_ID] = { .type = NLA_U32 },
1019 [CTA_NAT_DST] = { .type = NLA_NESTED },
1020 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1021 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1022 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1023 [CTA_ZONE] = { .type = NLA_U16 },
1024 [CTA_MARK_MASK] = { .type = NLA_U32 },
1025 [CTA_LABELS] = { .type = NLA_BINARY,
1026 .len = NF_CT_LABELS_MAX_SIZE },
1027 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1028 .len = NF_CT_LABELS_MAX_SIZE },
1031 static int ctnetlink_flush_conntrack(struct net *net,
1032 const struct nlattr * const cda[],
1033 u32 portid, int report)
1035 struct ctnetlink_filter *filter = NULL;
1037 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1038 filter = ctnetlink_alloc_filter(cda);
1040 return PTR_ERR(filter);
1043 nf_ct_iterate_cleanup(net, ctnetlink_filter_match, filter,
1051 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
1052 const struct nlmsghdr *nlh,
1053 const struct nlattr * const cda[])
1055 struct net *net = sock_net(ctnl);
1056 struct nf_conntrack_tuple_hash *h;
1057 struct nf_conntrack_tuple tuple;
1059 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1060 u_int8_t u3 = nfmsg->nfgen_family;
1064 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1068 if (cda[CTA_TUPLE_ORIG])
1069 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1070 else if (cda[CTA_TUPLE_REPLY])
1071 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1073 return ctnetlink_flush_conntrack(net, cda,
1074 NETLINK_CB(skb).portid,
1081 h = nf_conntrack_find_get(net, zone, &tuple);
1085 ct = nf_ct_tuplehash_to_ctrack(h);
1088 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1089 if (id != (u32)(unsigned long)ct) {
1095 if (del_timer(&ct->timeout))
1096 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1104 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
1105 const struct nlmsghdr *nlh,
1106 const struct nlattr * const cda[])
1108 struct net *net = sock_net(ctnl);
1109 struct nf_conntrack_tuple_hash *h;
1110 struct nf_conntrack_tuple tuple;
1112 struct sk_buff *skb2 = NULL;
1113 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1114 u_int8_t u3 = nfmsg->nfgen_family;
1118 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1119 struct netlink_dump_control c = {
1120 .dump = ctnetlink_dump_table,
1121 .done = ctnetlink_done,
1124 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1125 struct ctnetlink_filter *filter;
1127 filter = ctnetlink_alloc_filter(cda);
1129 return PTR_ERR(filter);
1133 return netlink_dump_start(ctnl, skb, nlh, &c);
1136 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1140 if (cda[CTA_TUPLE_ORIG])
1141 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1142 else if (cda[CTA_TUPLE_REPLY])
1143 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1150 h = nf_conntrack_find_get(net, zone, &tuple);
1154 ct = nf_ct_tuplehash_to_ctrack(h);
1157 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1164 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1165 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1171 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1180 /* this avoids a loop in nfnetlink. */
1181 return err == -EAGAIN ? -ENOBUFS : err;
1184 static int ctnetlink_done_list(struct netlink_callback *cb)
1187 nf_ct_put((struct nf_conn *)cb->args[1]);
1192 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1194 struct nf_conn *ct, *last;
1195 struct nf_conntrack_tuple_hash *h;
1196 struct hlist_nulls_node *n;
1197 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1198 u_int8_t l3proto = nfmsg->nfgen_family;
1201 struct hlist_nulls_head *list;
1202 struct net *net = sock_net(skb->sk);
1207 last = (struct nf_conn *)cb->args[1];
1209 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1210 struct ct_pcpu *pcpu;
1212 if (!cpu_possible(cpu))
1215 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1216 spin_lock_bh(&pcpu->lock);
1217 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1219 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1220 ct = nf_ct_tuplehash_to_ctrack(h);
1221 if (l3proto && nf_ct_l3num(ct) != l3proto)
1229 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1231 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1235 if (!atomic_inc_not_zero(&ct->ct_general.use))
1238 cb->args[1] = (unsigned long)ct;
1239 spin_unlock_bh(&pcpu->lock);
1247 spin_unlock_bh(&pcpu->lock);
1258 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1260 return ctnetlink_dump_list(skb, cb, true);
1264 ctnetlink_get_ct_dying(struct sock *ctnl, struct sk_buff *skb,
1265 const struct nlmsghdr *nlh,
1266 const struct nlattr * const cda[])
1268 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1269 struct netlink_dump_control c = {
1270 .dump = ctnetlink_dump_dying,
1271 .done = ctnetlink_done_list,
1273 return netlink_dump_start(ctnl, skb, nlh, &c);
1280 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1282 return ctnetlink_dump_list(skb, cb, false);
1286 ctnetlink_get_ct_unconfirmed(struct sock *ctnl, struct sk_buff *skb,
1287 const struct nlmsghdr *nlh,
1288 const struct nlattr * const cda[])
1290 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1291 struct netlink_dump_control c = {
1292 .dump = ctnetlink_dump_unconfirmed,
1293 .done = ctnetlink_done_list,
1295 return netlink_dump_start(ctnl, skb, nlh, &c);
1301 #ifdef CONFIG_NF_NAT_NEEDED
1303 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1304 enum nf_nat_manip_type manip,
1305 const struct nlattr *attr)
1307 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1310 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1311 if (!parse_nat_setup) {
1312 #ifdef CONFIG_MODULES
1314 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1315 if (request_module("nf-nat") < 0) {
1316 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1320 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1322 if (nfnetlink_parse_nat_setup_hook)
1328 err = parse_nat_setup(ct, manip, attr);
1329 if (err == -EAGAIN) {
1330 #ifdef CONFIG_MODULES
1332 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1333 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1334 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1338 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1349 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1352 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1353 d = ct->status ^ status;
1355 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1359 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1360 /* SEEN_REPLY bit can only be set */
1363 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1364 /* ASSURED bit can only be set */
1367 /* Be careful here, modifying NAT bits can screw up things,
1368 * so don't let users modify them directly if they don't pass
1370 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1375 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1377 #ifdef CONFIG_NF_NAT_NEEDED
1380 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1383 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1388 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1392 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1399 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1401 struct nf_conntrack_helper *helper;
1402 struct nf_conn_help *help = nfct_help(ct);
1403 char *helpname = NULL;
1404 struct nlattr *helpinfo = NULL;
1407 /* don't change helper of sibling connections */
1411 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1415 if (!strcmp(helpname, "")) {
1416 if (help && help->helper) {
1417 /* we had a helper before ... */
1418 nf_ct_remove_expectations(ct);
1419 RCU_INIT_POINTER(help->helper, NULL);
1425 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1426 nf_ct_protonum(ct));
1427 if (helper == NULL) {
1428 #ifdef CONFIG_MODULES
1429 spin_unlock_bh(&nf_conntrack_expect_lock);
1431 if (request_module("nfct-helper-%s", helpname) < 0) {
1432 spin_lock_bh(&nf_conntrack_expect_lock);
1436 spin_lock_bh(&nf_conntrack_expect_lock);
1437 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1438 nf_ct_protonum(ct));
1446 if (help->helper == helper) {
1447 /* update private helper data if allowed. */
1448 if (helper->from_nlattr)
1449 helper->from_nlattr(helpinfo, ct);
1455 /* we cannot set a helper for an existing conntrack */
1460 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1462 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1464 if (!del_timer(&ct->timeout))
1467 ct->timeout.expires = jiffies + timeout * HZ;
1468 add_timer(&ct->timeout);
1473 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1474 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1475 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1476 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1480 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1482 const struct nlattr *attr = cda[CTA_PROTOINFO];
1483 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1484 struct nf_conntrack_l4proto *l4proto;
1487 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1492 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1493 if (l4proto->from_nlattr)
1494 err = l4proto->from_nlattr(tb, ct);
1500 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1501 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1502 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1503 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1507 change_seq_adj(struct nf_ct_seqadj *seq, const struct nlattr * const attr)
1510 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1512 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1516 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1519 seq->correction_pos =
1520 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1522 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1525 seq->offset_before =
1526 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1528 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1532 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1538 ctnetlink_change_seq_adj(struct nf_conn *ct,
1539 const struct nlattr * const cda[])
1541 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1547 if (cda[CTA_SEQ_ADJ_ORIG]) {
1548 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1549 cda[CTA_SEQ_ADJ_ORIG]);
1553 ct->status |= IPS_SEQ_ADJUST;
1556 if (cda[CTA_SEQ_ADJ_REPLY]) {
1557 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1558 cda[CTA_SEQ_ADJ_REPLY]);
1562 ct->status |= IPS_SEQ_ADJUST;
1569 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1571 #ifdef CONFIG_NF_CONNTRACK_LABELS
1572 size_t len = nla_len(cda[CTA_LABELS]);
1573 const void *mask = cda[CTA_LABELS_MASK];
1575 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1579 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1580 nla_len(cda[CTA_LABELS_MASK]) != len)
1582 mask = nla_data(cda[CTA_LABELS_MASK]);
1587 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1594 ctnetlink_change_conntrack(struct nf_conn *ct,
1595 const struct nlattr * const cda[])
1599 /* only allow NAT changes and master assignation for new conntracks */
1600 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1603 if (cda[CTA_HELP]) {
1604 err = ctnetlink_change_helper(ct, cda);
1609 if (cda[CTA_TIMEOUT]) {
1610 err = ctnetlink_change_timeout(ct, cda);
1615 if (cda[CTA_STATUS]) {
1616 err = ctnetlink_change_status(ct, cda);
1621 if (cda[CTA_PROTOINFO]) {
1622 err = ctnetlink_change_protoinfo(ct, cda);
1627 #if defined(CONFIG_NF_CONNTRACK_MARK)
1629 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1632 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1633 err = ctnetlink_change_seq_adj(ct, cda);
1638 if (cda[CTA_LABELS]) {
1639 err = ctnetlink_attach_labels(ct, cda);
1647 static struct nf_conn *
1648 ctnetlink_create_conntrack(struct net *net, u16 zone,
1649 const struct nlattr * const cda[],
1650 struct nf_conntrack_tuple *otuple,
1651 struct nf_conntrack_tuple *rtuple,
1656 struct nf_conntrack_helper *helper;
1657 struct nf_conn_tstamp *tstamp;
1659 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1661 return ERR_PTR(-ENOMEM);
1663 if (!cda[CTA_TIMEOUT])
1665 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1667 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1670 if (cda[CTA_HELP]) {
1671 char *helpname = NULL;
1672 struct nlattr *helpinfo = NULL;
1674 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1678 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1679 nf_ct_protonum(ct));
1680 if (helper == NULL) {
1682 #ifdef CONFIG_MODULES
1683 if (request_module("nfct-helper-%s", helpname) < 0) {
1689 helper = __nf_conntrack_helper_find(helpname,
1691 nf_ct_protonum(ct));
1701 struct nf_conn_help *help;
1703 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1708 /* set private helper data if allowed. */
1709 if (helper->from_nlattr)
1710 helper->from_nlattr(helpinfo, ct);
1712 /* not in hash table yet so not strictly necessary */
1713 RCU_INIT_POINTER(help->helper, helper);
1716 /* try an implicit helper assignation */
1717 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1722 err = ctnetlink_setup_nat(ct, cda);
1726 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1727 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1728 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1729 nf_ct_labels_ext_add(ct);
1731 /* we must add conntrack extensions before confirmation. */
1732 ct->status |= IPS_CONFIRMED;
1734 if (cda[CTA_STATUS]) {
1735 err = ctnetlink_change_status(ct, cda);
1740 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1741 err = ctnetlink_change_seq_adj(ct, cda);
1746 memset(&ct->proto, 0, sizeof(ct->proto));
1747 if (cda[CTA_PROTOINFO]) {
1748 err = ctnetlink_change_protoinfo(ct, cda);
1753 #if defined(CONFIG_NF_CONNTRACK_MARK)
1755 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1758 /* setup master conntrack: this is a confirmed expectation */
1759 if (cda[CTA_TUPLE_MASTER]) {
1760 struct nf_conntrack_tuple master;
1761 struct nf_conntrack_tuple_hash *master_h;
1762 struct nf_conn *master_ct;
1764 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1768 master_h = nf_conntrack_find_get(net, zone, &master);
1769 if (master_h == NULL) {
1773 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1774 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1775 ct->master = master_ct;
1777 tstamp = nf_conn_tstamp_find(ct);
1779 tstamp->start = ktime_get_real_ns();
1781 err = nf_conntrack_hash_check_insert(ct);
1792 nf_conntrack_free(ct);
1793 return ERR_PTR(err);
1797 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1798 const struct nlmsghdr *nlh,
1799 const struct nlattr * const cda[])
1801 struct net *net = sock_net(ctnl);
1802 struct nf_conntrack_tuple otuple, rtuple;
1803 struct nf_conntrack_tuple_hash *h = NULL;
1804 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1806 u_int8_t u3 = nfmsg->nfgen_family;
1810 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1814 if (cda[CTA_TUPLE_ORIG]) {
1815 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1820 if (cda[CTA_TUPLE_REPLY]) {
1821 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1826 if (cda[CTA_TUPLE_ORIG])
1827 h = nf_conntrack_find_get(net, zone, &otuple);
1828 else if (cda[CTA_TUPLE_REPLY])
1829 h = nf_conntrack_find_get(net, zone, &rtuple);
1833 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1834 enum ip_conntrack_events events;
1836 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1839 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1845 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1846 events = IPCT_RELATED;
1850 if (cda[CTA_LABELS] &&
1851 ctnetlink_attach_labels(ct, cda) == 0)
1852 events |= (1 << IPCT_LABEL);
1854 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1855 (1 << IPCT_ASSURED) |
1856 (1 << IPCT_HELPER) |
1857 (1 << IPCT_PROTOINFO) |
1858 (1 << IPCT_SEQADJ) |
1859 (1 << IPCT_MARK) | events,
1860 ct, NETLINK_CB(skb).portid,
1867 /* implicit 'else' */
1870 ct = nf_ct_tuplehash_to_ctrack(h);
1871 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1872 spin_lock_bh(&nf_conntrack_expect_lock);
1873 err = ctnetlink_change_conntrack(ct, cda);
1874 spin_unlock_bh(&nf_conntrack_expect_lock);
1876 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1877 (1 << IPCT_ASSURED) |
1878 (1 << IPCT_HELPER) |
1880 (1 << IPCT_PROTOINFO) |
1881 (1 << IPCT_SEQADJ) |
1883 ct, NETLINK_CB(skb).portid,
1893 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1894 __u16 cpu, const struct ip_conntrack_stat *st)
1896 struct nlmsghdr *nlh;
1897 struct nfgenmsg *nfmsg;
1898 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1900 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1901 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1905 nfmsg = nlmsg_data(nlh);
1906 nfmsg->nfgen_family = AF_UNSPEC;
1907 nfmsg->version = NFNETLINK_V0;
1908 nfmsg->res_id = htons(cpu);
1910 if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1911 nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1912 nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
1913 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1914 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1915 nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
1916 nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
1917 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1918 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1919 htonl(st->insert_failed)) ||
1920 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1921 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1922 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1923 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1924 htonl(st->search_restart)))
1925 goto nla_put_failure;
1927 nlmsg_end(skb, nlh);
1932 nlmsg_cancel(skb, nlh);
1937 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
1940 struct net *net = sock_net(skb->sk);
1942 if (cb->args[0] == nr_cpu_ids)
1945 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1946 const struct ip_conntrack_stat *st;
1948 if (!cpu_possible(cpu))
1951 st = per_cpu_ptr(net->ct.stat, cpu);
1952 if (ctnetlink_ct_stat_cpu_fill_info(skb,
1953 NETLINK_CB(cb->skb).portid,
1964 ctnetlink_stat_ct_cpu(struct sock *ctnl, struct sk_buff *skb,
1965 const struct nlmsghdr *nlh,
1966 const struct nlattr * const cda[])
1968 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1969 struct netlink_dump_control c = {
1970 .dump = ctnetlink_ct_stat_cpu_dump,
1972 return netlink_dump_start(ctnl, skb, nlh, &c);
1979 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
1982 struct nlmsghdr *nlh;
1983 struct nfgenmsg *nfmsg;
1984 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1985 unsigned int nr_conntracks = atomic_read(&net->ct.count);
1987 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
1988 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1992 nfmsg = nlmsg_data(nlh);
1993 nfmsg->nfgen_family = AF_UNSPEC;
1994 nfmsg->version = NFNETLINK_V0;
1997 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
1998 goto nla_put_failure;
2000 nlmsg_end(skb, nlh);
2005 nlmsg_cancel(skb, nlh);
2010 ctnetlink_stat_ct(struct sock *ctnl, struct sk_buff *skb,
2011 const struct nlmsghdr *nlh,
2012 const struct nlattr * const cda[])
2014 struct sk_buff *skb2;
2017 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2021 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2023 NFNL_MSG_TYPE(nlh->nlmsg_type),
2028 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2037 /* this avoids a loop in nfnetlink. */
2038 return err == -EAGAIN ? -ENOBUFS : err;
2041 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2042 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2043 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2044 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2045 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2046 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2047 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2048 .len = NF_CT_HELPER_NAME_LEN - 1 },
2049 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2050 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2051 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2052 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2053 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2056 static struct nf_conntrack_expect *
2057 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2058 struct nf_conntrack_helper *helper,
2059 struct nf_conntrack_tuple *tuple,
2060 struct nf_conntrack_tuple *mask);
2062 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
2064 ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
2066 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2067 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2068 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2069 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2070 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2071 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2072 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2073 + nla_total_size(0) /* CTA_PROTOINFO */
2074 + nla_total_size(0) /* CTA_HELP */
2075 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2076 + ctnetlink_secctx_size(ct)
2077 #ifdef CONFIG_NF_NAT_NEEDED
2078 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2079 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2081 #ifdef CONFIG_NF_CONNTRACK_MARK
2082 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2084 #ifdef CONFIG_NF_CONNTRACK_ZONES
2085 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE */
2087 + ctnetlink_proto_size(ct)
2092 ctnetlink_nfqueue_build(struct sk_buff *skb, struct nf_conn *ct)
2094 struct nlattr *nest_parms;
2097 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2099 goto nla_put_failure;
2100 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2101 goto nla_put_failure;
2102 nla_nest_end(skb, nest_parms);
2104 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2106 goto nla_put_failure;
2107 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2108 goto nla_put_failure;
2109 nla_nest_end(skb, nest_parms);
2111 if (nf_ct_zone(ct)) {
2112 if (nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
2113 goto nla_put_failure;
2116 if (ctnetlink_dump_id(skb, ct) < 0)
2117 goto nla_put_failure;
2119 if (ctnetlink_dump_status(skb, ct) < 0)
2120 goto nla_put_failure;
2122 if (ctnetlink_dump_timeout(skb, ct) < 0)
2123 goto nla_put_failure;
2125 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2126 goto nla_put_failure;
2128 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2129 goto nla_put_failure;
2131 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2132 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2133 goto nla_put_failure;
2135 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2136 goto nla_put_failure;
2138 if ((ct->status & IPS_SEQ_ADJUST) &&
2139 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2140 goto nla_put_failure;
2142 #ifdef CONFIG_NF_CONNTRACK_MARK
2143 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2144 goto nla_put_failure;
2146 if (ctnetlink_dump_labels(skb, ct) < 0)
2147 goto nla_put_failure;
2157 ctnetlink_nfqueue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2161 if (cda[CTA_TIMEOUT]) {
2162 err = ctnetlink_change_timeout(ct, cda);
2166 if (cda[CTA_STATUS]) {
2167 err = ctnetlink_change_status(ct, cda);
2171 if (cda[CTA_HELP]) {
2172 err = ctnetlink_change_helper(ct, cda);
2176 if (cda[CTA_LABELS]) {
2177 err = ctnetlink_attach_labels(ct, cda);
2181 #if defined(CONFIG_NF_CONNTRACK_MARK)
2182 if (cda[CTA_MARK]) {
2183 u32 mask = 0, mark, newmark;
2184 if (cda[CTA_MARK_MASK])
2185 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2187 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2188 newmark = (ct->mark & mask) ^ mark;
2189 if (newmark != ct->mark)
2197 ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
2199 struct nlattr *cda[CTA_MAX+1];
2202 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2206 spin_lock_bh(&nf_conntrack_expect_lock);
2207 ret = ctnetlink_nfqueue_parse_ct((const struct nlattr **)cda, ct);
2208 spin_unlock_bh(&nf_conntrack_expect_lock);
2213 static int ctnetlink_nfqueue_exp_parse(const struct nlattr * const *cda,
2214 const struct nf_conn *ct,
2215 struct nf_conntrack_tuple *tuple,
2216 struct nf_conntrack_tuple *mask)
2220 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2225 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2230 ctnetlink_nfqueue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2231 u32 portid, u32 report)
2233 struct nlattr *cda[CTA_EXPECT_MAX+1];
2234 struct nf_conntrack_tuple tuple, mask;
2235 struct nf_conntrack_helper *helper = NULL;
2236 struct nf_conntrack_expect *exp;
2239 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2243 err = ctnetlink_nfqueue_exp_parse((const struct nlattr * const *)cda,
2248 if (cda[CTA_EXPECT_HELP_NAME]) {
2249 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2251 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2252 nf_ct_protonum(ct));
2257 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2258 helper, &tuple, &mask);
2260 return PTR_ERR(exp);
2262 err = nf_ct_expect_related_report(exp, portid, report);
2264 nf_ct_expect_put(exp);
2271 static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
2272 .build_size = ctnetlink_nfqueue_build_size,
2273 .build = ctnetlink_nfqueue_build,
2274 .parse = ctnetlink_nfqueue_parse,
2275 .attach_expect = ctnetlink_nfqueue_attach_expect,
2276 .seq_adjust = nf_ct_tcp_seqadj_set,
2278 #endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
2280 /***********************************************************************
2282 ***********************************************************************/
2285 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2286 const struct nf_conntrack_tuple *tuple,
2287 enum ctattr_expect type)
2289 struct nlattr *nest_parms;
2291 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2293 goto nla_put_failure;
2294 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2295 goto nla_put_failure;
2296 nla_nest_end(skb, nest_parms);
2305 ctnetlink_exp_dump_mask(struct sk_buff *skb,
2306 const struct nf_conntrack_tuple *tuple,
2307 const struct nf_conntrack_tuple_mask *mask)
2310 struct nf_conntrack_l3proto *l3proto;
2311 struct nf_conntrack_l4proto *l4proto;
2312 struct nf_conntrack_tuple m;
2313 struct nlattr *nest_parms;
2315 memset(&m, 0xFF, sizeof(m));
2316 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2317 m.src.u.all = mask->src.u.all;
2318 m.dst.protonum = tuple->dst.protonum;
2320 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2322 goto nla_put_failure;
2325 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2326 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2328 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2329 tuple->dst.protonum);
2330 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2334 if (unlikely(ret < 0))
2335 goto nla_put_failure;
2337 nla_nest_end(skb, nest_parms);
2345 static const union nf_inet_addr any_addr;
2348 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2349 const struct nf_conntrack_expect *exp)
2351 struct nf_conn *master = exp->master;
2352 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2353 struct nf_conn_help *help;
2354 #ifdef CONFIG_NF_NAT_NEEDED
2355 struct nlattr *nest_parms;
2356 struct nf_conntrack_tuple nat_tuple = {};
2358 struct nf_ct_helper_expectfn *expfn;
2363 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2364 goto nla_put_failure;
2365 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2366 goto nla_put_failure;
2367 if (ctnetlink_exp_dump_tuple(skb,
2368 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2369 CTA_EXPECT_MASTER) < 0)
2370 goto nla_put_failure;
2372 #ifdef CONFIG_NF_NAT_NEEDED
2373 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2374 exp->saved_proto.all) {
2375 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2377 goto nla_put_failure;
2379 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2380 goto nla_put_failure;
2382 nat_tuple.src.l3num = nf_ct_l3num(master);
2383 nat_tuple.src.u3 = exp->saved_addr;
2384 nat_tuple.dst.protonum = nf_ct_protonum(master);
2385 nat_tuple.src.u = exp->saved_proto;
2387 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2388 CTA_EXPECT_NAT_TUPLE) < 0)
2389 goto nla_put_failure;
2390 nla_nest_end(skb, nest_parms);
2393 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2394 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2395 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2396 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2397 goto nla_put_failure;
2398 help = nfct_help(master);
2400 struct nf_conntrack_helper *helper;
2402 helper = rcu_dereference(help->helper);
2404 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2405 goto nla_put_failure;
2407 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2408 if (expfn != NULL &&
2409 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2410 goto nla_put_failure;
2419 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2420 int event, const struct nf_conntrack_expect *exp)
2422 struct nlmsghdr *nlh;
2423 struct nfgenmsg *nfmsg;
2424 unsigned int flags = portid ? NLM_F_MULTI : 0;
2426 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2427 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2431 nfmsg = nlmsg_data(nlh);
2432 nfmsg->nfgen_family = exp->tuple.src.l3num;
2433 nfmsg->version = NFNETLINK_V0;
2436 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2437 goto nla_put_failure;
2439 nlmsg_end(skb, nlh);
2444 nlmsg_cancel(skb, nlh);
2448 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2450 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2452 struct nf_conntrack_expect *exp = item->exp;
2453 struct net *net = nf_ct_exp_net(exp);
2454 struct nlmsghdr *nlh;
2455 struct nfgenmsg *nfmsg;
2456 struct sk_buff *skb;
2457 unsigned int type, group;
2460 if (events & (1 << IPEXP_DESTROY)) {
2461 type = IPCTNL_MSG_EXP_DELETE;
2462 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2463 } else if (events & (1 << IPEXP_NEW)) {
2464 type = IPCTNL_MSG_EXP_NEW;
2465 flags = NLM_F_CREATE|NLM_F_EXCL;
2466 group = NFNLGRP_CONNTRACK_EXP_NEW;
2470 if (!item->report && !nfnetlink_has_listeners(net, group))
2473 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2477 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2478 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2482 nfmsg = nlmsg_data(nlh);
2483 nfmsg->nfgen_family = exp->tuple.src.l3num;
2484 nfmsg->version = NFNETLINK_V0;
2488 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2489 goto nla_put_failure;
2492 nlmsg_end(skb, nlh);
2493 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2498 nlmsg_cancel(skb, nlh);
2502 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2506 static int ctnetlink_exp_done(struct netlink_callback *cb)
2509 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2514 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2516 struct net *net = sock_net(skb->sk);
2517 struct nf_conntrack_expect *exp, *last;
2518 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2519 u_int8_t l3proto = nfmsg->nfgen_family;
2522 last = (struct nf_conntrack_expect *)cb->args[1];
2523 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2525 hlist_for_each_entry(exp, &net->ct.expect_hash[cb->args[0]],
2527 if (l3proto && exp->tuple.src.l3num != l3proto)
2534 if (ctnetlink_exp_fill_info(skb,
2535 NETLINK_CB(cb->skb).portid,
2539 if (!atomic_inc_not_zero(&exp->use))
2541 cb->args[1] = (unsigned long)exp;
2553 nf_ct_expect_put(last);
2559 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2561 struct nf_conntrack_expect *exp, *last;
2562 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2563 struct nf_conn *ct = cb->data;
2564 struct nf_conn_help *help = nfct_help(ct);
2565 u_int8_t l3proto = nfmsg->nfgen_family;
2571 last = (struct nf_conntrack_expect *)cb->args[1];
2573 hlist_for_each_entry(exp, &help->expectations, lnode) {
2574 if (l3proto && exp->tuple.src.l3num != l3proto)
2581 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2585 if (!atomic_inc_not_zero(&exp->use))
2587 cb->args[1] = (unsigned long)exp;
2599 nf_ct_expect_put(last);
2604 static int ctnetlink_dump_exp_ct(struct sock *ctnl, struct sk_buff *skb,
2605 const struct nlmsghdr *nlh,
2606 const struct nlattr * const cda[])
2609 struct net *net = sock_net(ctnl);
2610 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2611 u_int8_t u3 = nfmsg->nfgen_family;
2612 struct nf_conntrack_tuple tuple;
2613 struct nf_conntrack_tuple_hash *h;
2616 struct netlink_dump_control c = {
2617 .dump = ctnetlink_exp_ct_dump_table,
2618 .done = ctnetlink_exp_done,
2621 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2625 if (cda[CTA_EXPECT_ZONE]) {
2626 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2631 h = nf_conntrack_find_get(net, zone, &tuple);
2635 ct = nf_ct_tuplehash_to_ctrack(h);
2638 err = netlink_dump_start(ctnl, skb, nlh, &c);
2645 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
2646 const struct nlmsghdr *nlh,
2647 const struct nlattr * const cda[])
2649 struct net *net = sock_net(ctnl);
2650 struct nf_conntrack_tuple tuple;
2651 struct nf_conntrack_expect *exp;
2652 struct sk_buff *skb2;
2653 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2654 u_int8_t u3 = nfmsg->nfgen_family;
2658 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2659 if (cda[CTA_EXPECT_MASTER])
2660 return ctnetlink_dump_exp_ct(ctnl, skb, nlh, cda);
2662 struct netlink_dump_control c = {
2663 .dump = ctnetlink_exp_dump_table,
2664 .done = ctnetlink_exp_done,
2666 return netlink_dump_start(ctnl, skb, nlh, &c);
2670 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2674 if (cda[CTA_EXPECT_TUPLE])
2675 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2676 else if (cda[CTA_EXPECT_MASTER])
2677 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2684 exp = nf_ct_expect_find_get(net, zone, &tuple);
2688 if (cda[CTA_EXPECT_ID]) {
2689 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2690 if (ntohl(id) != (u32)(unsigned long)exp) {
2691 nf_ct_expect_put(exp);
2697 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2699 nf_ct_expect_put(exp);
2704 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2705 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2707 nf_ct_expect_put(exp);
2711 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2720 /* this avoids a loop in nfnetlink. */
2721 return err == -EAGAIN ? -ENOBUFS : err;
2725 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
2726 const struct nlmsghdr *nlh,
2727 const struct nlattr * const cda[])
2729 struct net *net = sock_net(ctnl);
2730 struct nf_conntrack_expect *exp;
2731 struct nf_conntrack_tuple tuple;
2732 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2733 struct hlist_node *next;
2734 u_int8_t u3 = nfmsg->nfgen_family;
2739 if (cda[CTA_EXPECT_TUPLE]) {
2740 /* delete a single expect by tuple */
2741 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2745 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2749 /* bump usage count to 2 */
2750 exp = nf_ct_expect_find_get(net, zone, &tuple);
2754 if (cda[CTA_EXPECT_ID]) {
2755 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2756 if (ntohl(id) != (u32)(unsigned long)exp) {
2757 nf_ct_expect_put(exp);
2762 /* after list removal, usage count == 1 */
2763 spin_lock_bh(&nf_conntrack_expect_lock);
2764 if (del_timer(&exp->timeout)) {
2765 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2767 nf_ct_expect_put(exp);
2769 spin_unlock_bh(&nf_conntrack_expect_lock);
2770 /* have to put what we 'get' above.
2771 * after this line usage count == 0 */
2772 nf_ct_expect_put(exp);
2773 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2774 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2775 struct nf_conn_help *m_help;
2777 /* delete all expectations for this helper */
2778 spin_lock_bh(&nf_conntrack_expect_lock);
2779 for (i = 0; i < nf_ct_expect_hsize; i++) {
2780 hlist_for_each_entry_safe(exp, next,
2781 &net->ct.expect_hash[i],
2783 m_help = nfct_help(exp->master);
2784 if (!strcmp(m_help->helper->name, name) &&
2785 del_timer(&exp->timeout)) {
2786 nf_ct_unlink_expect_report(exp,
2787 NETLINK_CB(skb).portid,
2789 nf_ct_expect_put(exp);
2793 spin_unlock_bh(&nf_conntrack_expect_lock);
2795 /* This basically means we have to flush everything*/
2796 spin_lock_bh(&nf_conntrack_expect_lock);
2797 for (i = 0; i < nf_ct_expect_hsize; i++) {
2798 hlist_for_each_entry_safe(exp, next,
2799 &net->ct.expect_hash[i],
2801 if (del_timer(&exp->timeout)) {
2802 nf_ct_unlink_expect_report(exp,
2803 NETLINK_CB(skb).portid,
2805 nf_ct_expect_put(exp);
2809 spin_unlock_bh(&nf_conntrack_expect_lock);
2815 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2816 const struct nlattr * const cda[])
2818 if (cda[CTA_EXPECT_TIMEOUT]) {
2819 if (!del_timer(&x->timeout))
2822 x->timeout.expires = jiffies +
2823 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2824 add_timer(&x->timeout);
2829 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2830 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2831 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2835 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2836 struct nf_conntrack_expect *exp,
2839 #ifdef CONFIG_NF_NAT_NEEDED
2840 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2841 struct nf_conntrack_tuple nat_tuple = {};
2844 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2848 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2851 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2852 &nat_tuple, CTA_EXPECT_NAT_TUPLE, u3);
2856 exp->saved_addr = nat_tuple.src.u3;
2857 exp->saved_proto = nat_tuple.src.u;
2858 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2866 static struct nf_conntrack_expect *
2867 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
2868 struct nf_conntrack_helper *helper,
2869 struct nf_conntrack_tuple *tuple,
2870 struct nf_conntrack_tuple *mask)
2872 u_int32_t class = 0;
2873 struct nf_conntrack_expect *exp;
2874 struct nf_conn_help *help;
2877 if (cda[CTA_EXPECT_CLASS] && helper) {
2878 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
2879 if (class > helper->expect_class_max)
2880 return ERR_PTR(-EINVAL);
2882 exp = nf_ct_expect_alloc(ct);
2884 return ERR_PTR(-ENOMEM);
2886 help = nfct_help(ct);
2888 if (!cda[CTA_EXPECT_TIMEOUT]) {
2892 exp->timeout.expires =
2893 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2895 exp->flags = NF_CT_EXPECT_USERSPACE;
2896 if (cda[CTA_EXPECT_FLAGS]) {
2898 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2901 if (cda[CTA_EXPECT_FLAGS]) {
2902 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2903 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2907 if (cda[CTA_EXPECT_FN]) {
2908 const char *name = nla_data(cda[CTA_EXPECT_FN]);
2909 struct nf_ct_helper_expectfn *expfn;
2911 expfn = nf_ct_helper_expectfn_find_by_name(name);
2912 if (expfn == NULL) {
2916 exp->expectfn = expfn->expectfn;
2918 exp->expectfn = NULL;
2922 exp->helper = helper;
2923 exp->tuple = *tuple;
2924 exp->mask.src.u3 = mask->src.u3;
2925 exp->mask.src.u.all = mask->src.u.all;
2927 if (cda[CTA_EXPECT_NAT]) {
2928 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
2929 exp, nf_ct_l3num(ct));
2935 nf_ct_expect_put(exp);
2936 return ERR_PTR(err);
2940 ctnetlink_create_expect(struct net *net, u16 zone,
2941 const struct nlattr * const cda[],
2942 u_int8_t u3, u32 portid, int report)
2944 struct nf_conntrack_tuple tuple, mask, master_tuple;
2945 struct nf_conntrack_tuple_hash *h = NULL;
2946 struct nf_conntrack_helper *helper = NULL;
2947 struct nf_conntrack_expect *exp;
2951 /* caller guarantees that those three CTA_EXPECT_* exist */
2952 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2955 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2958 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2962 /* Look for master conntrack of this expectation */
2963 h = nf_conntrack_find_get(net, zone, &master_tuple);
2966 ct = nf_ct_tuplehash_to_ctrack(h);
2968 if (cda[CTA_EXPECT_HELP_NAME]) {
2969 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2971 helper = __nf_conntrack_helper_find(helpname, u3,
2972 nf_ct_protonum(ct));
2973 if (helper == NULL) {
2974 #ifdef CONFIG_MODULES
2975 if (request_module("nfct-helper-%s", helpname) < 0) {
2979 helper = __nf_conntrack_helper_find(helpname, u3,
2980 nf_ct_protonum(ct));
2991 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
2997 err = nf_ct_expect_related_report(exp, portid, report);
3003 nf_ct_expect_put(exp);
3010 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
3011 const struct nlmsghdr *nlh,
3012 const struct nlattr * const cda[])
3014 struct net *net = sock_net(ctnl);
3015 struct nf_conntrack_tuple tuple;
3016 struct nf_conntrack_expect *exp;
3017 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3018 u_int8_t u3 = nfmsg->nfgen_family;
3022 if (!cda[CTA_EXPECT_TUPLE]
3023 || !cda[CTA_EXPECT_MASK]
3024 || !cda[CTA_EXPECT_MASTER])
3027 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3031 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
3035 spin_lock_bh(&nf_conntrack_expect_lock);
3036 exp = __nf_ct_expect_find(net, zone, &tuple);
3039 spin_unlock_bh(&nf_conntrack_expect_lock);
3041 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3042 err = ctnetlink_create_expect(net, zone, cda,
3044 NETLINK_CB(skb).portid,
3051 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3052 err = ctnetlink_change_expect(exp, cda);
3053 spin_unlock_bh(&nf_conntrack_expect_lock);
3059 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3060 const struct ip_conntrack_stat *st)
3062 struct nlmsghdr *nlh;
3063 struct nfgenmsg *nfmsg;
3064 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3066 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
3067 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3071 nfmsg = nlmsg_data(nlh);
3072 nfmsg->nfgen_family = AF_UNSPEC;
3073 nfmsg->version = NFNETLINK_V0;
3074 nfmsg->res_id = htons(cpu);
3076 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3077 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3078 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3079 goto nla_put_failure;
3081 nlmsg_end(skb, nlh);
3086 nlmsg_cancel(skb, nlh);
3091 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3094 struct net *net = sock_net(skb->sk);
3096 if (cb->args[0] == nr_cpu_ids)
3099 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3100 const struct ip_conntrack_stat *st;
3102 if (!cpu_possible(cpu))
3105 st = per_cpu_ptr(net->ct.stat, cpu);
3106 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3117 ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
3118 const struct nlmsghdr *nlh,
3119 const struct nlattr * const cda[])
3121 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3122 struct netlink_dump_control c = {
3123 .dump = ctnetlink_exp_stat_cpu_dump,
3125 return netlink_dump_start(ctnl, skb, nlh, &c);
3131 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3132 static struct nf_ct_event_notifier ctnl_notifier = {
3133 .fcn = ctnetlink_conntrack_event,
3136 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3137 .fcn = ctnetlink_expect_event,
3141 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3142 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3143 .attr_count = CTA_MAX,
3144 .policy = ct_nla_policy },
3145 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3146 .attr_count = CTA_MAX,
3147 .policy = ct_nla_policy },
3148 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3149 .attr_count = CTA_MAX,
3150 .policy = ct_nla_policy },
3151 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3152 .attr_count = CTA_MAX,
3153 .policy = ct_nla_policy },
3154 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3155 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3156 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3157 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3160 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3161 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3162 .attr_count = CTA_EXPECT_MAX,
3163 .policy = exp_nla_policy },
3164 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3165 .attr_count = CTA_EXPECT_MAX,
3166 .policy = exp_nla_policy },
3167 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3168 .attr_count = CTA_EXPECT_MAX,
3169 .policy = exp_nla_policy },
3170 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3173 static const struct nfnetlink_subsystem ctnl_subsys = {
3174 .name = "conntrack",
3175 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3176 .cb_count = IPCTNL_MSG_MAX,
3180 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3181 .name = "conntrack_expect",
3182 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3183 .cb_count = IPCTNL_MSG_EXP_MAX,
3187 MODULE_ALIAS("ip_conntrack_netlink");
3188 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3189 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3191 static int __net_init ctnetlink_net_init(struct net *net)
3193 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3196 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3198 pr_err("ctnetlink_init: cannot register notifier.\n");
3202 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3204 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3205 goto err_unreg_notifier;
3210 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3212 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3218 static void ctnetlink_net_exit(struct net *net)
3220 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3221 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3222 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3226 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3230 list_for_each_entry(net, net_exit_list, exit_list)
3231 ctnetlink_net_exit(net);
3234 static struct pernet_operations ctnetlink_net_ops = {
3235 .init = ctnetlink_net_init,
3236 .exit_batch = ctnetlink_net_exit_batch,
3239 static int __init ctnetlink_init(void)
3243 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3244 ret = nfnetlink_subsys_register(&ctnl_subsys);
3246 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3250 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3252 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3253 goto err_unreg_subsys;
3256 ret = register_pernet_subsys(&ctnetlink_net_ops);
3258 pr_err("ctnetlink_init: cannot register pernet operations\n");
3259 goto err_unreg_exp_subsys;
3261 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3262 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3263 RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
3267 err_unreg_exp_subsys:
3268 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3270 nfnetlink_subsys_unregister(&ctnl_subsys);
3275 static void __exit ctnetlink_exit(void)
3277 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3279 unregister_pernet_subsys(&ctnetlink_net_ops);
3280 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3281 nfnetlink_subsys_unregister(&ctnl_subsys);
3282 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3283 RCU_INIT_POINTER(nfq_ct_hook, NULL);
3287 module_init(ctnetlink_init);
3288 module_exit(ctnetlink_exit);