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 + ctnetlink_proto_size(ct)
601 + ctnetlink_label_size(ct)
605 #ifdef CONFIG_NF_CONNTRACK_EVENTS
607 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
610 struct nlmsghdr *nlh;
611 struct nfgenmsg *nfmsg;
612 struct nlattr *nest_parms;
613 struct nf_conn *ct = item->ct;
616 unsigned int flags = 0, group;
619 /* ignore our fake conntrack entry */
620 if (nf_ct_is_untracked(ct))
623 if (events & (1 << IPCT_DESTROY)) {
624 type = IPCTNL_MSG_CT_DELETE;
625 group = NFNLGRP_CONNTRACK_DESTROY;
626 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
627 type = IPCTNL_MSG_CT_NEW;
628 flags = NLM_F_CREATE|NLM_F_EXCL;
629 group = NFNLGRP_CONNTRACK_NEW;
631 type = IPCTNL_MSG_CT_NEW;
632 group = NFNLGRP_CONNTRACK_UPDATE;
637 if (!item->report && !nfnetlink_has_listeners(net, group))
640 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
644 type |= NFNL_SUBSYS_CTNETLINK << 8;
645 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
649 nfmsg = nlmsg_data(nlh);
650 nfmsg->nfgen_family = nf_ct_l3num(ct);
651 nfmsg->version = NFNETLINK_V0;
655 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
657 goto nla_put_failure;
658 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
659 goto nla_put_failure;
660 nla_nest_end(skb, nest_parms);
662 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
664 goto nla_put_failure;
665 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
666 goto nla_put_failure;
667 nla_nest_end(skb, nest_parms);
669 if (nf_ct_zone(ct) &&
670 nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
671 goto nla_put_failure;
673 if (ctnetlink_dump_id(skb, ct) < 0)
674 goto nla_put_failure;
676 if (ctnetlink_dump_status(skb, ct) < 0)
677 goto nla_put_failure;
679 if (events & (1 << IPCT_DESTROY)) {
680 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
681 ctnetlink_dump_timestamp(skb, ct) < 0)
682 goto nla_put_failure;
684 if (ctnetlink_dump_timeout(skb, ct) < 0)
685 goto nla_put_failure;
687 if (events & (1 << IPCT_PROTOINFO)
688 && ctnetlink_dump_protoinfo(skb, ct) < 0)
689 goto nla_put_failure;
691 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
692 && ctnetlink_dump_helpinfo(skb, ct) < 0)
693 goto nla_put_failure;
695 #ifdef CONFIG_NF_CONNTRACK_SECMARK
696 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
697 && ctnetlink_dump_secctx(skb, ct) < 0)
698 goto nla_put_failure;
700 if (events & (1 << IPCT_LABEL) &&
701 ctnetlink_dump_labels(skb, ct) < 0)
702 goto nla_put_failure;
704 if (events & (1 << IPCT_RELATED) &&
705 ctnetlink_dump_master(skb, ct) < 0)
706 goto nla_put_failure;
708 if (events & (1 << IPCT_SEQADJ) &&
709 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
710 goto nla_put_failure;
713 #ifdef CONFIG_NF_CONNTRACK_MARK
714 if ((events & (1 << IPCT_MARK) || ct->mark)
715 && ctnetlink_dump_mark(skb, ct) < 0)
716 goto nla_put_failure;
721 err = nfnetlink_send(skb, net, item->portid, group, item->report,
723 if (err == -ENOBUFS || err == -EAGAIN)
730 nlmsg_cancel(skb, nlh);
734 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
739 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
741 static int ctnetlink_done(struct netlink_callback *cb)
744 nf_ct_put((struct nf_conn *)cb->args[1]);
750 struct ctnetlink_dump_filter {
758 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
760 struct net *net = sock_net(skb->sk);
761 struct nf_conn *ct, *last;
762 struct nf_conntrack_tuple_hash *h;
763 struct hlist_nulls_node *n;
764 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
765 u_int8_t l3proto = nfmsg->nfgen_family;
767 #ifdef CONFIG_NF_CONNTRACK_MARK
768 const struct ctnetlink_dump_filter *filter = cb->data;
771 spin_lock_bh(&nf_conntrack_lock);
772 last = (struct nf_conn *)cb->args[1];
773 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
775 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
777 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
779 ct = nf_ct_tuplehash_to_ctrack(h);
780 /* Dump entries of a given L3 protocol number.
781 * If it is not specified, ie. l3proto == 0,
782 * then dump everything. */
783 if (l3proto && nf_ct_l3num(ct) != l3proto)
790 #ifdef CONFIG_NF_CONNTRACK_MARK
791 if (filter && !((ct->mark & filter->mark.mask) ==
798 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
800 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
804 nf_conntrack_get(&ct->ct_general);
805 cb->args[1] = (unsigned long)ct;
815 spin_unlock_bh(&nf_conntrack_lock);
823 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
825 struct nlattr *tb[CTA_IP_MAX+1];
826 struct nf_conntrack_l3proto *l3proto;
829 ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
834 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
836 if (likely(l3proto->nlattr_to_tuple)) {
837 ret = nla_validate_nested(attr, CTA_IP_MAX,
838 l3proto->nla_policy);
840 ret = l3proto->nlattr_to_tuple(tb, tuple);
848 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
849 [CTA_PROTO_NUM] = { .type = NLA_U8 },
853 ctnetlink_parse_tuple_proto(struct nlattr *attr,
854 struct nf_conntrack_tuple *tuple)
856 struct nlattr *tb[CTA_PROTO_MAX+1];
857 struct nf_conntrack_l4proto *l4proto;
860 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
864 if (!tb[CTA_PROTO_NUM])
866 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
869 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
871 if (likely(l4proto->nlattr_to_tuple)) {
872 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
873 l4proto->nla_policy);
875 ret = l4proto->nlattr_to_tuple(tb, tuple);
883 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
884 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
885 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
889 ctnetlink_parse_tuple(const struct nlattr * const cda[],
890 struct nf_conntrack_tuple *tuple,
891 enum ctattr_type type, u_int8_t l3num)
893 struct nlattr *tb[CTA_TUPLE_MAX+1];
896 memset(tuple, 0, sizeof(*tuple));
898 err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
902 if (!tb[CTA_TUPLE_IP])
905 tuple->src.l3num = l3num;
907 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
911 if (!tb[CTA_TUPLE_PROTO])
914 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
918 /* orig and expect tuples get DIR_ORIGINAL */
919 if (type == CTA_TUPLE_REPLY)
920 tuple->dst.dir = IP_CT_DIR_REPLY;
922 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
928 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
931 #ifdef CONFIG_NF_CONNTRACK_ZONES
932 *zone = ntohs(nla_get_be16(attr));
942 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
943 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
944 .len = NF_CT_HELPER_NAME_LEN - 1 },
948 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
949 struct nlattr **helpinfo)
952 struct nlattr *tb[CTA_HELP_MAX+1];
954 err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
958 if (!tb[CTA_HELP_NAME])
961 *helper_name = nla_data(tb[CTA_HELP_NAME]);
963 if (tb[CTA_HELP_INFO])
964 *helpinfo = tb[CTA_HELP_INFO];
969 #define __CTA_LABELS_MAX_LENGTH ((XT_CONNLABEL_MAXBIT + 1) / BITS_PER_BYTE)
970 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
971 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
972 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
973 [CTA_STATUS] = { .type = NLA_U32 },
974 [CTA_PROTOINFO] = { .type = NLA_NESTED },
975 [CTA_HELP] = { .type = NLA_NESTED },
976 [CTA_NAT_SRC] = { .type = NLA_NESTED },
977 [CTA_TIMEOUT] = { .type = NLA_U32 },
978 [CTA_MARK] = { .type = NLA_U32 },
979 [CTA_ID] = { .type = NLA_U32 },
980 [CTA_NAT_DST] = { .type = NLA_NESTED },
981 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
982 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
983 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
984 [CTA_ZONE] = { .type = NLA_U16 },
985 [CTA_MARK_MASK] = { .type = NLA_U32 },
986 [CTA_LABELS] = { .type = NLA_BINARY,
987 .len = __CTA_LABELS_MAX_LENGTH },
988 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
989 .len = __CTA_LABELS_MAX_LENGTH },
993 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
994 const struct nlmsghdr *nlh,
995 const struct nlattr * const cda[])
997 struct net *net = sock_net(ctnl);
998 struct nf_conntrack_tuple_hash *h;
999 struct nf_conntrack_tuple tuple;
1001 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1002 u_int8_t u3 = nfmsg->nfgen_family;
1006 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1010 if (cda[CTA_TUPLE_ORIG])
1011 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1012 else if (cda[CTA_TUPLE_REPLY])
1013 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1015 /* Flush the whole table */
1016 nf_conntrack_flush_report(net,
1017 NETLINK_CB(skb).portid,
1025 h = nf_conntrack_find_get(net, zone, &tuple);
1029 ct = nf_ct_tuplehash_to_ctrack(h);
1032 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1033 if (id != (u32)(unsigned long)ct) {
1039 if (del_timer(&ct->timeout))
1040 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1048 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
1049 const struct nlmsghdr *nlh,
1050 const struct nlattr * const cda[])
1052 struct net *net = sock_net(ctnl);
1053 struct nf_conntrack_tuple_hash *h;
1054 struct nf_conntrack_tuple tuple;
1056 struct sk_buff *skb2 = NULL;
1057 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1058 u_int8_t u3 = nfmsg->nfgen_family;
1062 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1063 struct netlink_dump_control c = {
1064 .dump = ctnetlink_dump_table,
1065 .done = ctnetlink_done,
1067 #ifdef CONFIG_NF_CONNTRACK_MARK
1068 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1069 struct ctnetlink_dump_filter *filter;
1071 filter = kzalloc(sizeof(struct ctnetlink_dump_filter),
1076 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
1078 ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1082 return netlink_dump_start(ctnl, skb, nlh, &c);
1085 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1089 if (cda[CTA_TUPLE_ORIG])
1090 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1091 else if (cda[CTA_TUPLE_REPLY])
1092 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1099 h = nf_conntrack_find_get(net, zone, &tuple);
1103 ct = nf_ct_tuplehash_to_ctrack(h);
1106 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1113 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1114 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1120 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1129 /* this avoids a loop in nfnetlink. */
1130 return err == -EAGAIN ? -ENOBUFS : err;
1133 static int ctnetlink_done_list(struct netlink_callback *cb)
1136 nf_ct_put((struct nf_conn *)cb->args[1]);
1141 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb,
1142 struct hlist_nulls_head *list)
1144 struct nf_conn *ct, *last;
1145 struct nf_conntrack_tuple_hash *h;
1146 struct hlist_nulls_node *n;
1147 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1148 u_int8_t l3proto = nfmsg->nfgen_family;
1154 spin_lock_bh(&nf_conntrack_lock);
1155 last = (struct nf_conn *)cb->args[1];
1157 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1158 ct = nf_ct_tuplehash_to_ctrack(h);
1159 if (l3proto && nf_ct_l3num(ct) != l3proto)
1167 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1169 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1173 nf_conntrack_get(&ct->ct_general);
1174 cb->args[1] = (unsigned long)ct;
1184 spin_unlock_bh(&nf_conntrack_lock);
1192 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1194 struct net *net = sock_net(skb->sk);
1196 return ctnetlink_dump_list(skb, cb, &net->ct.dying);
1200 ctnetlink_get_ct_dying(struct sock *ctnl, struct sk_buff *skb,
1201 const struct nlmsghdr *nlh,
1202 const struct nlattr * const cda[])
1204 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1205 struct netlink_dump_control c = {
1206 .dump = ctnetlink_dump_dying,
1207 .done = ctnetlink_done_list,
1209 return netlink_dump_start(ctnl, skb, nlh, &c);
1216 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1218 struct net *net = sock_net(skb->sk);
1220 return ctnetlink_dump_list(skb, cb, &net->ct.unconfirmed);
1224 ctnetlink_get_ct_unconfirmed(struct sock *ctnl, struct sk_buff *skb,
1225 const struct nlmsghdr *nlh,
1226 const struct nlattr * const cda[])
1228 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1229 struct netlink_dump_control c = {
1230 .dump = ctnetlink_dump_unconfirmed,
1231 .done = ctnetlink_done_list,
1233 return netlink_dump_start(ctnl, skb, nlh, &c);
1239 #ifdef CONFIG_NF_NAT_NEEDED
1241 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1242 enum nf_nat_manip_type manip,
1243 const struct nlattr *attr)
1245 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1248 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1249 if (!parse_nat_setup) {
1250 #ifdef CONFIG_MODULES
1252 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1253 if (request_module("nf-nat") < 0) {
1254 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1258 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1260 if (nfnetlink_parse_nat_setup_hook)
1266 err = parse_nat_setup(ct, manip, attr);
1267 if (err == -EAGAIN) {
1268 #ifdef CONFIG_MODULES
1270 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1271 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1272 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1276 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1287 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1290 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1291 d = ct->status ^ status;
1293 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1297 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1298 /* SEEN_REPLY bit can only be set */
1301 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1302 /* ASSURED bit can only be set */
1305 /* Be careful here, modifying NAT bits can screw up things,
1306 * so don't let users modify them directly if they don't pass
1308 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1313 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1315 #ifdef CONFIG_NF_NAT_NEEDED
1318 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1323 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1327 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1334 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1336 struct nf_conntrack_helper *helper;
1337 struct nf_conn_help *help = nfct_help(ct);
1338 char *helpname = NULL;
1339 struct nlattr *helpinfo = NULL;
1342 /* don't change helper of sibling connections */
1346 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1350 if (!strcmp(helpname, "")) {
1351 if (help && help->helper) {
1352 /* we had a helper before ... */
1353 nf_ct_remove_expectations(ct);
1354 RCU_INIT_POINTER(help->helper, NULL);
1360 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1361 nf_ct_protonum(ct));
1362 if (helper == NULL) {
1363 #ifdef CONFIG_MODULES
1364 spin_unlock_bh(&nf_conntrack_lock);
1366 if (request_module("nfct-helper-%s", helpname) < 0) {
1367 spin_lock_bh(&nf_conntrack_lock);
1371 spin_lock_bh(&nf_conntrack_lock);
1372 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1373 nf_ct_protonum(ct));
1381 if (help->helper == helper) {
1382 /* update private helper data if allowed. */
1383 if (helper->from_nlattr)
1384 helper->from_nlattr(helpinfo, ct);
1390 /* we cannot set a helper for an existing conntrack */
1395 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1397 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1399 if (!del_timer(&ct->timeout))
1402 ct->timeout.expires = jiffies + timeout * HZ;
1403 add_timer(&ct->timeout);
1408 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1409 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1410 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1411 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1415 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1417 const struct nlattr *attr = cda[CTA_PROTOINFO];
1418 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1419 struct nf_conntrack_l4proto *l4proto;
1422 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1427 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1428 if (l4proto->from_nlattr)
1429 err = l4proto->from_nlattr(tb, ct);
1435 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1436 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1437 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1438 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1442 change_seq_adj(struct nf_ct_seqadj *seq, const struct nlattr * const attr)
1445 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1447 err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1451 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1454 seq->correction_pos =
1455 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1457 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1460 seq->offset_before =
1461 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1463 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1467 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1473 ctnetlink_change_seq_adj(struct nf_conn *ct,
1474 const struct nlattr * const cda[])
1476 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1482 if (cda[CTA_SEQ_ADJ_ORIG]) {
1483 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1484 cda[CTA_SEQ_ADJ_ORIG]);
1488 ct->status |= IPS_SEQ_ADJUST;
1491 if (cda[CTA_SEQ_ADJ_REPLY]) {
1492 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1493 cda[CTA_SEQ_ADJ_REPLY]);
1497 ct->status |= IPS_SEQ_ADJUST;
1504 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1506 #ifdef CONFIG_NF_CONNTRACK_LABELS
1507 size_t len = nla_len(cda[CTA_LABELS]);
1508 const void *mask = cda[CTA_LABELS_MASK];
1510 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1514 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1515 nla_len(cda[CTA_LABELS_MASK]) != len)
1517 mask = nla_data(cda[CTA_LABELS_MASK]);
1522 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1529 ctnetlink_change_conntrack(struct nf_conn *ct,
1530 const struct nlattr * const cda[])
1534 /* only allow NAT changes and master assignation for new conntracks */
1535 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1538 if (cda[CTA_HELP]) {
1539 err = ctnetlink_change_helper(ct, cda);
1544 if (cda[CTA_TIMEOUT]) {
1545 err = ctnetlink_change_timeout(ct, cda);
1550 if (cda[CTA_STATUS]) {
1551 err = ctnetlink_change_status(ct, cda);
1556 if (cda[CTA_PROTOINFO]) {
1557 err = ctnetlink_change_protoinfo(ct, cda);
1562 #if defined(CONFIG_NF_CONNTRACK_MARK)
1564 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1567 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1568 err = ctnetlink_change_seq_adj(ct, cda);
1573 if (cda[CTA_LABELS]) {
1574 err = ctnetlink_attach_labels(ct, cda);
1582 static struct nf_conn *
1583 ctnetlink_create_conntrack(struct net *net, u16 zone,
1584 const struct nlattr * const cda[],
1585 struct nf_conntrack_tuple *otuple,
1586 struct nf_conntrack_tuple *rtuple,
1591 struct nf_conntrack_helper *helper;
1592 struct nf_conn_tstamp *tstamp;
1594 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1596 return ERR_PTR(-ENOMEM);
1598 if (!cda[CTA_TIMEOUT])
1600 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1602 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1605 if (cda[CTA_HELP]) {
1606 char *helpname = NULL;
1607 struct nlattr *helpinfo = NULL;
1609 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1613 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1614 nf_ct_protonum(ct));
1615 if (helper == NULL) {
1617 #ifdef CONFIG_MODULES
1618 if (request_module("nfct-helper-%s", helpname) < 0) {
1624 helper = __nf_conntrack_helper_find(helpname,
1626 nf_ct_protonum(ct));
1636 struct nf_conn_help *help;
1638 help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1643 /* set private helper data if allowed. */
1644 if (helper->from_nlattr)
1645 helper->from_nlattr(helpinfo, ct);
1647 /* not in hash table yet so not strictly necessary */
1648 RCU_INIT_POINTER(help->helper, helper);
1651 /* try an implicit helper assignation */
1652 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1657 err = ctnetlink_setup_nat(ct, cda);
1661 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1662 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1663 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1664 nf_ct_labels_ext_add(ct);
1666 /* we must add conntrack extensions before confirmation. */
1667 ct->status |= IPS_CONFIRMED;
1669 if (cda[CTA_STATUS]) {
1670 err = ctnetlink_change_status(ct, cda);
1675 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1676 err = ctnetlink_change_seq_adj(ct, cda);
1681 memset(&ct->proto, 0, sizeof(ct->proto));
1682 if (cda[CTA_PROTOINFO]) {
1683 err = ctnetlink_change_protoinfo(ct, cda);
1688 #if defined(CONFIG_NF_CONNTRACK_MARK)
1690 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1693 /* setup master conntrack: this is a confirmed expectation */
1694 if (cda[CTA_TUPLE_MASTER]) {
1695 struct nf_conntrack_tuple master;
1696 struct nf_conntrack_tuple_hash *master_h;
1697 struct nf_conn *master_ct;
1699 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1703 master_h = nf_conntrack_find_get(net, zone, &master);
1704 if (master_h == NULL) {
1708 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1709 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1710 ct->master = master_ct;
1712 tstamp = nf_conn_tstamp_find(ct);
1714 tstamp->start = ktime_to_ns(ktime_get_real());
1716 err = nf_conntrack_hash_check_insert(ct);
1727 nf_conntrack_free(ct);
1728 return ERR_PTR(err);
1732 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1733 const struct nlmsghdr *nlh,
1734 const struct nlattr * const cda[])
1736 struct net *net = sock_net(ctnl);
1737 struct nf_conntrack_tuple otuple, rtuple;
1738 struct nf_conntrack_tuple_hash *h = NULL;
1739 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1741 u_int8_t u3 = nfmsg->nfgen_family;
1745 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1749 if (cda[CTA_TUPLE_ORIG]) {
1750 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1755 if (cda[CTA_TUPLE_REPLY]) {
1756 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1761 if (cda[CTA_TUPLE_ORIG])
1762 h = nf_conntrack_find_get(net, zone, &otuple);
1763 else if (cda[CTA_TUPLE_REPLY])
1764 h = nf_conntrack_find_get(net, zone, &rtuple);
1768 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1769 enum ip_conntrack_events events;
1771 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1774 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1780 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1781 events = IPCT_RELATED;
1785 if (cda[CTA_LABELS] &&
1786 ctnetlink_attach_labels(ct, cda) == 0)
1787 events |= (1 << IPCT_LABEL);
1789 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1790 (1 << IPCT_ASSURED) |
1791 (1 << IPCT_HELPER) |
1792 (1 << IPCT_PROTOINFO) |
1793 (1 << IPCT_SEQADJ) |
1794 (1 << IPCT_MARK) | events,
1795 ct, NETLINK_CB(skb).portid,
1802 /* implicit 'else' */
1805 ct = nf_ct_tuplehash_to_ctrack(h);
1806 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1807 spin_lock_bh(&nf_conntrack_lock);
1808 err = ctnetlink_change_conntrack(ct, cda);
1809 spin_unlock_bh(&nf_conntrack_lock);
1811 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1812 (1 << IPCT_ASSURED) |
1813 (1 << IPCT_HELPER) |
1815 (1 << IPCT_PROTOINFO) |
1816 (1 << IPCT_SEQADJ) |
1818 ct, NETLINK_CB(skb).portid,
1828 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1829 __u16 cpu, const struct ip_conntrack_stat *st)
1831 struct nlmsghdr *nlh;
1832 struct nfgenmsg *nfmsg;
1833 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1835 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1836 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1840 nfmsg = nlmsg_data(nlh);
1841 nfmsg->nfgen_family = AF_UNSPEC;
1842 nfmsg->version = NFNETLINK_V0;
1843 nfmsg->res_id = htons(cpu);
1845 if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1846 nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1847 nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
1848 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1849 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1850 nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
1851 nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
1852 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1853 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1854 htonl(st->insert_failed)) ||
1855 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1856 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1857 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1858 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1859 htonl(st->search_restart)))
1860 goto nla_put_failure;
1862 nlmsg_end(skb, nlh);
1867 nlmsg_cancel(skb, nlh);
1872 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
1875 struct net *net = sock_net(skb->sk);
1877 if (cb->args[0] == nr_cpu_ids)
1880 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1881 const struct ip_conntrack_stat *st;
1883 if (!cpu_possible(cpu))
1886 st = per_cpu_ptr(net->ct.stat, cpu);
1887 if (ctnetlink_ct_stat_cpu_fill_info(skb,
1888 NETLINK_CB(cb->skb).portid,
1899 ctnetlink_stat_ct_cpu(struct sock *ctnl, struct sk_buff *skb,
1900 const struct nlmsghdr *nlh,
1901 const struct nlattr * const cda[])
1903 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1904 struct netlink_dump_control c = {
1905 .dump = ctnetlink_ct_stat_cpu_dump,
1907 return netlink_dump_start(ctnl, skb, nlh, &c);
1914 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
1917 struct nlmsghdr *nlh;
1918 struct nfgenmsg *nfmsg;
1919 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1920 unsigned int nr_conntracks = atomic_read(&net->ct.count);
1922 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
1923 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1927 nfmsg = nlmsg_data(nlh);
1928 nfmsg->nfgen_family = AF_UNSPEC;
1929 nfmsg->version = NFNETLINK_V0;
1932 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
1933 goto nla_put_failure;
1935 nlmsg_end(skb, nlh);
1940 nlmsg_cancel(skb, nlh);
1945 ctnetlink_stat_ct(struct sock *ctnl, struct sk_buff *skb,
1946 const struct nlmsghdr *nlh,
1947 const struct nlattr * const cda[])
1949 struct sk_buff *skb2;
1952 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1956 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
1958 NFNL_MSG_TYPE(nlh->nlmsg_type),
1963 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1972 /* this avoids a loop in nfnetlink. */
1973 return err == -EAGAIN ? -ENOBUFS : err;
1976 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1977 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1978 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1979 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1980 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1981 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1982 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
1983 .len = NF_CT_HELPER_NAME_LEN - 1 },
1984 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
1985 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
1986 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
1987 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
1988 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
1991 static struct nf_conntrack_expect *
1992 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
1993 struct nf_conntrack_helper *helper,
1994 struct nf_conntrack_tuple *tuple,
1995 struct nf_conntrack_tuple *mask);
1997 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
1999 ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
2001 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2002 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2003 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2004 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2005 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2006 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2007 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2008 + nla_total_size(0) /* CTA_PROTOINFO */
2009 + nla_total_size(0) /* CTA_HELP */
2010 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2011 + ctnetlink_secctx_size(ct)
2012 #ifdef CONFIG_NF_NAT_NEEDED
2013 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2014 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2016 #ifdef CONFIG_NF_CONNTRACK_MARK
2017 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2019 + ctnetlink_proto_size(ct)
2024 ctnetlink_nfqueue_build(struct sk_buff *skb, struct nf_conn *ct)
2026 struct nlattr *nest_parms;
2029 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2031 goto nla_put_failure;
2032 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2033 goto nla_put_failure;
2034 nla_nest_end(skb, nest_parms);
2036 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2038 goto nla_put_failure;
2039 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2040 goto nla_put_failure;
2041 nla_nest_end(skb, nest_parms);
2043 if (nf_ct_zone(ct)) {
2044 if (nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
2045 goto nla_put_failure;
2048 if (ctnetlink_dump_id(skb, ct) < 0)
2049 goto nla_put_failure;
2051 if (ctnetlink_dump_status(skb, ct) < 0)
2052 goto nla_put_failure;
2054 if (ctnetlink_dump_timeout(skb, ct) < 0)
2055 goto nla_put_failure;
2057 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2058 goto nla_put_failure;
2060 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2061 goto nla_put_failure;
2063 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2064 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2065 goto nla_put_failure;
2067 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2068 goto nla_put_failure;
2070 if ((ct->status & IPS_SEQ_ADJUST) &&
2071 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2072 goto nla_put_failure;
2074 #ifdef CONFIG_NF_CONNTRACK_MARK
2075 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2076 goto nla_put_failure;
2078 if (ctnetlink_dump_labels(skb, ct) < 0)
2079 goto nla_put_failure;
2089 ctnetlink_nfqueue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2093 if (cda[CTA_TIMEOUT]) {
2094 err = ctnetlink_change_timeout(ct, cda);
2098 if (cda[CTA_STATUS]) {
2099 err = ctnetlink_change_status(ct, cda);
2103 if (cda[CTA_HELP]) {
2104 err = ctnetlink_change_helper(ct, cda);
2108 if (cda[CTA_LABELS]) {
2109 err = ctnetlink_attach_labels(ct, cda);
2113 #if defined(CONFIG_NF_CONNTRACK_MARK)
2114 if (cda[CTA_MARK]) {
2115 u32 mask = 0, mark, newmark;
2116 if (cda[CTA_MARK_MASK])
2117 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2119 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2120 newmark = (ct->mark & mask) ^ mark;
2121 if (newmark != ct->mark)
2129 ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
2131 struct nlattr *cda[CTA_MAX+1];
2134 ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2138 spin_lock_bh(&nf_conntrack_lock);
2139 ret = ctnetlink_nfqueue_parse_ct((const struct nlattr **)cda, ct);
2140 spin_unlock_bh(&nf_conntrack_lock);
2145 static int ctnetlink_nfqueue_exp_parse(const struct nlattr * const *cda,
2146 const struct nf_conn *ct,
2147 struct nf_conntrack_tuple *tuple,
2148 struct nf_conntrack_tuple *mask)
2152 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2157 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2162 ctnetlink_nfqueue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2163 u32 portid, u32 report)
2165 struct nlattr *cda[CTA_EXPECT_MAX+1];
2166 struct nf_conntrack_tuple tuple, mask;
2167 struct nf_conntrack_helper *helper = NULL;
2168 struct nf_conntrack_expect *exp;
2171 err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2175 err = ctnetlink_nfqueue_exp_parse((const struct nlattr * const *)cda,
2180 if (cda[CTA_EXPECT_HELP_NAME]) {
2181 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2183 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2184 nf_ct_protonum(ct));
2189 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2190 helper, &tuple, &mask);
2192 return PTR_ERR(exp);
2194 err = nf_ct_expect_related_report(exp, portid, report);
2196 nf_ct_expect_put(exp);
2203 static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
2204 .build_size = ctnetlink_nfqueue_build_size,
2205 .build = ctnetlink_nfqueue_build,
2206 .parse = ctnetlink_nfqueue_parse,
2207 .attach_expect = ctnetlink_nfqueue_attach_expect,
2208 .seq_adjust = nf_ct_tcp_seqadj_set,
2210 #endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
2212 /***********************************************************************
2214 ***********************************************************************/
2217 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2218 const struct nf_conntrack_tuple *tuple,
2219 enum ctattr_expect type)
2221 struct nlattr *nest_parms;
2223 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2225 goto nla_put_failure;
2226 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2227 goto nla_put_failure;
2228 nla_nest_end(skb, nest_parms);
2237 ctnetlink_exp_dump_mask(struct sk_buff *skb,
2238 const struct nf_conntrack_tuple *tuple,
2239 const struct nf_conntrack_tuple_mask *mask)
2242 struct nf_conntrack_l3proto *l3proto;
2243 struct nf_conntrack_l4proto *l4proto;
2244 struct nf_conntrack_tuple m;
2245 struct nlattr *nest_parms;
2247 memset(&m, 0xFF, sizeof(m));
2248 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2249 m.src.u.all = mask->src.u.all;
2250 m.dst.protonum = tuple->dst.protonum;
2252 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2254 goto nla_put_failure;
2257 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2258 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2260 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2261 tuple->dst.protonum);
2262 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2266 if (unlikely(ret < 0))
2267 goto nla_put_failure;
2269 nla_nest_end(skb, nest_parms);
2277 static const union nf_inet_addr any_addr;
2280 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2281 const struct nf_conntrack_expect *exp)
2283 struct nf_conn *master = exp->master;
2284 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2285 struct nf_conn_help *help;
2286 #ifdef CONFIG_NF_NAT_NEEDED
2287 struct nlattr *nest_parms;
2288 struct nf_conntrack_tuple nat_tuple = {};
2290 struct nf_ct_helper_expectfn *expfn;
2295 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2296 goto nla_put_failure;
2297 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2298 goto nla_put_failure;
2299 if (ctnetlink_exp_dump_tuple(skb,
2300 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2301 CTA_EXPECT_MASTER) < 0)
2302 goto nla_put_failure;
2304 #ifdef CONFIG_NF_NAT_NEEDED
2305 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2306 exp->saved_proto.all) {
2307 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2309 goto nla_put_failure;
2311 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2312 goto nla_put_failure;
2314 nat_tuple.src.l3num = nf_ct_l3num(master);
2315 nat_tuple.src.u3 = exp->saved_addr;
2316 nat_tuple.dst.protonum = nf_ct_protonum(master);
2317 nat_tuple.src.u = exp->saved_proto;
2319 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2320 CTA_EXPECT_NAT_TUPLE) < 0)
2321 goto nla_put_failure;
2322 nla_nest_end(skb, nest_parms);
2325 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2326 nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2327 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2328 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2329 goto nla_put_failure;
2330 help = nfct_help(master);
2332 struct nf_conntrack_helper *helper;
2334 helper = rcu_dereference(help->helper);
2336 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2337 goto nla_put_failure;
2339 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2340 if (expfn != NULL &&
2341 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2342 goto nla_put_failure;
2351 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2352 int event, const struct nf_conntrack_expect *exp)
2354 struct nlmsghdr *nlh;
2355 struct nfgenmsg *nfmsg;
2356 unsigned int flags = portid ? NLM_F_MULTI : 0;
2358 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2359 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2363 nfmsg = nlmsg_data(nlh);
2364 nfmsg->nfgen_family = exp->tuple.src.l3num;
2365 nfmsg->version = NFNETLINK_V0;
2368 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2369 goto nla_put_failure;
2371 nlmsg_end(skb, nlh);
2376 nlmsg_cancel(skb, nlh);
2380 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2382 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2384 struct nf_conntrack_expect *exp = item->exp;
2385 struct net *net = nf_ct_exp_net(exp);
2386 struct nlmsghdr *nlh;
2387 struct nfgenmsg *nfmsg;
2388 struct sk_buff *skb;
2389 unsigned int type, group;
2392 if (events & (1 << IPEXP_DESTROY)) {
2393 type = IPCTNL_MSG_EXP_DELETE;
2394 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2395 } else if (events & (1 << IPEXP_NEW)) {
2396 type = IPCTNL_MSG_EXP_NEW;
2397 flags = NLM_F_CREATE|NLM_F_EXCL;
2398 group = NFNLGRP_CONNTRACK_EXP_NEW;
2402 if (!item->report && !nfnetlink_has_listeners(net, group))
2405 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2409 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2410 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2414 nfmsg = nlmsg_data(nlh);
2415 nfmsg->nfgen_family = exp->tuple.src.l3num;
2416 nfmsg->version = NFNETLINK_V0;
2420 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2421 goto nla_put_failure;
2424 nlmsg_end(skb, nlh);
2425 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2430 nlmsg_cancel(skb, nlh);
2434 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2438 static int ctnetlink_exp_done(struct netlink_callback *cb)
2441 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2446 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2448 struct net *net = sock_net(skb->sk);
2449 struct nf_conntrack_expect *exp, *last;
2450 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2451 u_int8_t l3proto = nfmsg->nfgen_family;
2454 last = (struct nf_conntrack_expect *)cb->args[1];
2455 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2457 hlist_for_each_entry(exp, &net->ct.expect_hash[cb->args[0]],
2459 if (l3proto && exp->tuple.src.l3num != l3proto)
2466 if (ctnetlink_exp_fill_info(skb,
2467 NETLINK_CB(cb->skb).portid,
2471 if (!atomic_inc_not_zero(&exp->use))
2473 cb->args[1] = (unsigned long)exp;
2485 nf_ct_expect_put(last);
2491 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2493 struct nf_conntrack_expect *exp, *last;
2494 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2495 struct nf_conn *ct = cb->data;
2496 struct nf_conn_help *help = nfct_help(ct);
2497 u_int8_t l3proto = nfmsg->nfgen_family;
2503 last = (struct nf_conntrack_expect *)cb->args[1];
2505 hlist_for_each_entry(exp, &help->expectations, lnode) {
2506 if (l3proto && exp->tuple.src.l3num != l3proto)
2513 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2517 if (!atomic_inc_not_zero(&exp->use))
2519 cb->args[1] = (unsigned long)exp;
2531 nf_ct_expect_put(last);
2536 static int ctnetlink_dump_exp_ct(struct sock *ctnl, struct sk_buff *skb,
2537 const struct nlmsghdr *nlh,
2538 const struct nlattr * const cda[])
2541 struct net *net = sock_net(ctnl);
2542 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2543 u_int8_t u3 = nfmsg->nfgen_family;
2544 struct nf_conntrack_tuple tuple;
2545 struct nf_conntrack_tuple_hash *h;
2548 struct netlink_dump_control c = {
2549 .dump = ctnetlink_exp_ct_dump_table,
2550 .done = ctnetlink_exp_done,
2553 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2557 if (cda[CTA_EXPECT_ZONE]) {
2558 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2563 h = nf_conntrack_find_get(net, zone, &tuple);
2567 ct = nf_ct_tuplehash_to_ctrack(h);
2570 err = netlink_dump_start(ctnl, skb, nlh, &c);
2577 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
2578 const struct nlmsghdr *nlh,
2579 const struct nlattr * const cda[])
2581 struct net *net = sock_net(ctnl);
2582 struct nf_conntrack_tuple tuple;
2583 struct nf_conntrack_expect *exp;
2584 struct sk_buff *skb2;
2585 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2586 u_int8_t u3 = nfmsg->nfgen_family;
2590 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2591 if (cda[CTA_EXPECT_MASTER])
2592 return ctnetlink_dump_exp_ct(ctnl, skb, nlh, cda);
2594 struct netlink_dump_control c = {
2595 .dump = ctnetlink_exp_dump_table,
2596 .done = ctnetlink_exp_done,
2598 return netlink_dump_start(ctnl, skb, nlh, &c);
2602 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2606 if (cda[CTA_EXPECT_TUPLE])
2607 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2608 else if (cda[CTA_EXPECT_MASTER])
2609 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2616 exp = nf_ct_expect_find_get(net, zone, &tuple);
2620 if (cda[CTA_EXPECT_ID]) {
2621 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2622 if (ntohl(id) != (u32)(unsigned long)exp) {
2623 nf_ct_expect_put(exp);
2629 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2631 nf_ct_expect_put(exp);
2636 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2637 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2639 nf_ct_expect_put(exp);
2643 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2652 /* this avoids a loop in nfnetlink. */
2653 return err == -EAGAIN ? -ENOBUFS : err;
2657 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
2658 const struct nlmsghdr *nlh,
2659 const struct nlattr * const cda[])
2661 struct net *net = sock_net(ctnl);
2662 struct nf_conntrack_expect *exp;
2663 struct nf_conntrack_tuple tuple;
2664 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2665 struct hlist_node *next;
2666 u_int8_t u3 = nfmsg->nfgen_family;
2671 if (cda[CTA_EXPECT_TUPLE]) {
2672 /* delete a single expect by tuple */
2673 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2677 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2681 /* bump usage count to 2 */
2682 exp = nf_ct_expect_find_get(net, zone, &tuple);
2686 if (cda[CTA_EXPECT_ID]) {
2687 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2688 if (ntohl(id) != (u32)(unsigned long)exp) {
2689 nf_ct_expect_put(exp);
2694 /* after list removal, usage count == 1 */
2695 spin_lock_bh(&nf_conntrack_lock);
2696 if (del_timer(&exp->timeout)) {
2697 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2699 nf_ct_expect_put(exp);
2701 spin_unlock_bh(&nf_conntrack_lock);
2702 /* have to put what we 'get' above.
2703 * after this line usage count == 0 */
2704 nf_ct_expect_put(exp);
2705 } else if (cda[CTA_EXPECT_HELP_NAME]) {
2706 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2707 struct nf_conn_help *m_help;
2709 /* delete all expectations for this helper */
2710 spin_lock_bh(&nf_conntrack_lock);
2711 for (i = 0; i < nf_ct_expect_hsize; i++) {
2712 hlist_for_each_entry_safe(exp, next,
2713 &net->ct.expect_hash[i],
2715 m_help = nfct_help(exp->master);
2716 if (!strcmp(m_help->helper->name, name) &&
2717 del_timer(&exp->timeout)) {
2718 nf_ct_unlink_expect_report(exp,
2719 NETLINK_CB(skb).portid,
2721 nf_ct_expect_put(exp);
2725 spin_unlock_bh(&nf_conntrack_lock);
2727 /* This basically means we have to flush everything*/
2728 spin_lock_bh(&nf_conntrack_lock);
2729 for (i = 0; i < nf_ct_expect_hsize; i++) {
2730 hlist_for_each_entry_safe(exp, next,
2731 &net->ct.expect_hash[i],
2733 if (del_timer(&exp->timeout)) {
2734 nf_ct_unlink_expect_report(exp,
2735 NETLINK_CB(skb).portid,
2737 nf_ct_expect_put(exp);
2741 spin_unlock_bh(&nf_conntrack_lock);
2747 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2748 const struct nlattr * const cda[])
2750 if (cda[CTA_EXPECT_TIMEOUT]) {
2751 if (!del_timer(&x->timeout))
2754 x->timeout.expires = jiffies +
2755 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2756 add_timer(&x->timeout);
2761 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2762 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
2763 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
2767 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2768 struct nf_conntrack_expect *exp,
2771 #ifdef CONFIG_NF_NAT_NEEDED
2772 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2773 struct nf_conntrack_tuple nat_tuple = {};
2776 err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2780 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2783 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2784 &nat_tuple, CTA_EXPECT_NAT_TUPLE, u3);
2788 exp->saved_addr = nat_tuple.src.u3;
2789 exp->saved_proto = nat_tuple.src.u;
2790 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2798 static struct nf_conntrack_expect *
2799 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
2800 struct nf_conntrack_helper *helper,
2801 struct nf_conntrack_tuple *tuple,
2802 struct nf_conntrack_tuple *mask)
2804 u_int32_t class = 0;
2805 struct nf_conntrack_expect *exp;
2806 struct nf_conn_help *help;
2809 if (cda[CTA_EXPECT_CLASS] && helper) {
2810 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
2811 if (class > helper->expect_class_max)
2812 return ERR_PTR(-EINVAL);
2814 exp = nf_ct_expect_alloc(ct);
2816 return ERR_PTR(-ENOMEM);
2818 help = nfct_help(ct);
2820 if (!cda[CTA_EXPECT_TIMEOUT]) {
2824 exp->timeout.expires =
2825 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2827 exp->flags = NF_CT_EXPECT_USERSPACE;
2828 if (cda[CTA_EXPECT_FLAGS]) {
2830 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2833 if (cda[CTA_EXPECT_FLAGS]) {
2834 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2835 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2839 if (cda[CTA_EXPECT_FN]) {
2840 const char *name = nla_data(cda[CTA_EXPECT_FN]);
2841 struct nf_ct_helper_expectfn *expfn;
2843 expfn = nf_ct_helper_expectfn_find_by_name(name);
2844 if (expfn == NULL) {
2848 exp->expectfn = expfn->expectfn;
2850 exp->expectfn = NULL;
2854 exp->helper = helper;
2855 exp->tuple = *tuple;
2856 exp->mask.src.u3 = mask->src.u3;
2857 exp->mask.src.u.all = mask->src.u.all;
2859 if (cda[CTA_EXPECT_NAT]) {
2860 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
2861 exp, nf_ct_l3num(ct));
2867 nf_ct_expect_put(exp);
2868 return ERR_PTR(err);
2872 ctnetlink_create_expect(struct net *net, u16 zone,
2873 const struct nlattr * const cda[],
2874 u_int8_t u3, u32 portid, int report)
2876 struct nf_conntrack_tuple tuple, mask, master_tuple;
2877 struct nf_conntrack_tuple_hash *h = NULL;
2878 struct nf_conntrack_helper *helper = NULL;
2879 struct nf_conntrack_expect *exp;
2883 /* caller guarantees that those three CTA_EXPECT_* exist */
2884 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2887 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2890 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2894 /* Look for master conntrack of this expectation */
2895 h = nf_conntrack_find_get(net, zone, &master_tuple);
2898 ct = nf_ct_tuplehash_to_ctrack(h);
2900 if (cda[CTA_EXPECT_HELP_NAME]) {
2901 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2903 helper = __nf_conntrack_helper_find(helpname, u3,
2904 nf_ct_protonum(ct));
2905 if (helper == NULL) {
2906 #ifdef CONFIG_MODULES
2907 if (request_module("nfct-helper-%s", helpname) < 0) {
2911 helper = __nf_conntrack_helper_find(helpname, u3,
2912 nf_ct_protonum(ct));
2923 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
2929 err = nf_ct_expect_related_report(exp, portid, report);
2935 nf_ct_expect_put(exp);
2942 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2943 const struct nlmsghdr *nlh,
2944 const struct nlattr * const cda[])
2946 struct net *net = sock_net(ctnl);
2947 struct nf_conntrack_tuple tuple;
2948 struct nf_conntrack_expect *exp;
2949 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2950 u_int8_t u3 = nfmsg->nfgen_family;
2954 if (!cda[CTA_EXPECT_TUPLE]
2955 || !cda[CTA_EXPECT_MASK]
2956 || !cda[CTA_EXPECT_MASTER])
2959 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2963 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2967 spin_lock_bh(&nf_conntrack_lock);
2968 exp = __nf_ct_expect_find(net, zone, &tuple);
2971 spin_unlock_bh(&nf_conntrack_lock);
2973 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2974 err = ctnetlink_create_expect(net, zone, cda,
2976 NETLINK_CB(skb).portid,
2983 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2984 err = ctnetlink_change_expect(exp, cda);
2985 spin_unlock_bh(&nf_conntrack_lock);
2991 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
2992 const struct ip_conntrack_stat *st)
2994 struct nlmsghdr *nlh;
2995 struct nfgenmsg *nfmsg;
2996 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2998 event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
2999 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3003 nfmsg = nlmsg_data(nlh);
3004 nfmsg->nfgen_family = AF_UNSPEC;
3005 nfmsg->version = NFNETLINK_V0;
3006 nfmsg->res_id = htons(cpu);
3008 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3009 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3010 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3011 goto nla_put_failure;
3013 nlmsg_end(skb, nlh);
3018 nlmsg_cancel(skb, nlh);
3023 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3026 struct net *net = sock_net(skb->sk);
3028 if (cb->args[0] == nr_cpu_ids)
3031 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3032 const struct ip_conntrack_stat *st;
3034 if (!cpu_possible(cpu))
3037 st = per_cpu_ptr(net->ct.stat, cpu);
3038 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3049 ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
3050 const struct nlmsghdr *nlh,
3051 const struct nlattr * const cda[])
3053 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3054 struct netlink_dump_control c = {
3055 .dump = ctnetlink_exp_stat_cpu_dump,
3057 return netlink_dump_start(ctnl, skb, nlh, &c);
3063 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3064 static struct nf_ct_event_notifier ctnl_notifier = {
3065 .fcn = ctnetlink_conntrack_event,
3068 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3069 .fcn = ctnetlink_expect_event,
3073 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3074 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3075 .attr_count = CTA_MAX,
3076 .policy = ct_nla_policy },
3077 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3078 .attr_count = CTA_MAX,
3079 .policy = ct_nla_policy },
3080 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3081 .attr_count = CTA_MAX,
3082 .policy = ct_nla_policy },
3083 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3084 .attr_count = CTA_MAX,
3085 .policy = ct_nla_policy },
3086 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3087 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3088 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3089 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3092 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3093 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3094 .attr_count = CTA_EXPECT_MAX,
3095 .policy = exp_nla_policy },
3096 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3097 .attr_count = CTA_EXPECT_MAX,
3098 .policy = exp_nla_policy },
3099 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3100 .attr_count = CTA_EXPECT_MAX,
3101 .policy = exp_nla_policy },
3102 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3105 static const struct nfnetlink_subsystem ctnl_subsys = {
3106 .name = "conntrack",
3107 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3108 .cb_count = IPCTNL_MSG_MAX,
3112 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3113 .name = "conntrack_expect",
3114 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3115 .cb_count = IPCTNL_MSG_EXP_MAX,
3119 MODULE_ALIAS("ip_conntrack_netlink");
3120 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3121 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3123 static int __net_init ctnetlink_net_init(struct net *net)
3125 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3128 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3130 pr_err("ctnetlink_init: cannot register notifier.\n");
3134 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3136 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3137 goto err_unreg_notifier;
3142 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3144 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3150 static void ctnetlink_net_exit(struct net *net)
3152 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3153 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3154 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3158 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3162 list_for_each_entry(net, net_exit_list, exit_list)
3163 ctnetlink_net_exit(net);
3166 static struct pernet_operations ctnetlink_net_ops = {
3167 .init = ctnetlink_net_init,
3168 .exit_batch = ctnetlink_net_exit_batch,
3171 static int __init ctnetlink_init(void)
3175 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3176 ret = nfnetlink_subsys_register(&ctnl_subsys);
3178 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3182 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3184 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3185 goto err_unreg_subsys;
3188 ret = register_pernet_subsys(&ctnetlink_net_ops);
3190 pr_err("ctnetlink_init: cannot register pernet operations\n");
3191 goto err_unreg_exp_subsys;
3193 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3194 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3195 RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
3199 err_unreg_exp_subsys:
3200 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3202 nfnetlink_subsys_unregister(&ctnl_subsys);
3207 static void __exit ctnetlink_exit(void)
3209 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3211 unregister_pernet_subsys(&ctnetlink_net_ops);
3212 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3213 nfnetlink_subsys_unregister(&ctnl_subsys);
3214 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3215 RCU_INIT_POINTER(nfq_ct_hook, NULL);
3219 module_init(ctnetlink_init);
3220 module_exit(ctnetlink_exit);