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>
32 #include <linux/siphash.h>
34 #include <linux/netfilter.h>
35 #include <net/netlink.h>
37 #include <net/netfilter/nf_conntrack.h>
38 #include <net/netfilter/nf_conntrack_core.h>
39 #include <net/netfilter/nf_conntrack_expect.h>
40 #include <net/netfilter/nf_conntrack_helper.h>
41 #include <net/netfilter/nf_conntrack_seqadj.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 #include <net/netfilter/nf_conntrack_synproxy.h>
49 #if IS_ENABLED(CONFIG_NF_NAT)
50 #include <net/netfilter/nf_nat.h>
51 #include <net/netfilter/nf_nat_helper.h>
54 #include <linux/netfilter/nfnetlink.h>
55 #include <linux/netfilter/nfnetlink_conntrack.h>
57 #include "nf_internals.h"
59 MODULE_LICENSE("GPL");
61 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
62 const struct nf_conntrack_tuple *tuple,
63 const struct nf_conntrack_l4proto *l4proto)
66 struct nlattr *nest_parms;
68 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO);
71 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
74 if (likely(l4proto->tuple_to_nlattr))
75 ret = l4proto->tuple_to_nlattr(skb, tuple);
77 nla_nest_end(skb, nest_parms);
85 static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
86 const struct nf_conntrack_tuple *tuple)
88 if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
89 nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
94 static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
95 const struct nf_conntrack_tuple *tuple)
97 if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
98 nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
103 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
104 const struct nf_conntrack_tuple *tuple)
107 struct nlattr *nest_parms;
109 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP);
111 goto nla_put_failure;
113 switch (tuple->src.l3num) {
115 ret = ipv4_tuple_to_nlattr(skb, tuple);
118 ret = ipv6_tuple_to_nlattr(skb, tuple);
122 nla_nest_end(skb, nest_parms);
130 static int ctnetlink_dump_tuples(struct sk_buff *skb,
131 const struct nf_conntrack_tuple *tuple)
133 const struct nf_conntrack_l4proto *l4proto;
137 ret = ctnetlink_dump_tuples_ip(skb, tuple);
140 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
141 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
147 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
148 const struct nf_conntrack_zone *zone, int dir)
150 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
152 if (nla_put_be16(skb, attrtype, htons(zone->id)))
153 goto nla_put_failure;
160 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
162 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
163 goto nla_put_failure;
170 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct,
173 long timeout = nf_ct_expires(ct) / HZ;
175 if (skip_zero && timeout == 0)
178 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
179 goto nla_put_failure;
186 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct,
189 const struct nf_conntrack_l4proto *l4proto;
190 struct nlattr *nest_proto;
193 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
194 if (!l4proto->to_nlattr)
197 nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
199 goto nla_put_failure;
201 ret = l4proto->to_nlattr(skb, nest_proto, ct, destroy);
203 nla_nest_end(skb, nest_proto);
211 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
212 const struct nf_conn *ct)
214 struct nlattr *nest_helper;
215 const struct nf_conn_help *help = nfct_help(ct);
216 struct nf_conntrack_helper *helper;
222 helper = rcu_dereference(help->helper);
226 nest_helper = nla_nest_start(skb, CTA_HELP);
228 goto nla_put_failure;
229 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
230 goto nla_put_failure;
232 if (helper->to_nlattr)
233 helper->to_nlattr(skb, ct);
235 nla_nest_end(skb, nest_helper);
246 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
247 enum ip_conntrack_dir dir, int type)
249 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
250 struct nf_conn_counter *counter = acct->counter;
251 struct nlattr *nest_count;
254 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
255 pkts = atomic64_xchg(&counter[dir].packets, 0);
256 bytes = atomic64_xchg(&counter[dir].bytes, 0);
258 pkts = atomic64_read(&counter[dir].packets);
259 bytes = atomic64_read(&counter[dir].bytes);
262 nest_count = nla_nest_start(skb, attr);
264 goto nla_put_failure;
266 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
268 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
270 goto nla_put_failure;
272 nla_nest_end(skb, nest_count);
281 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
283 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
288 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
290 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
297 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
299 struct nlattr *nest_count;
300 const struct nf_conn_tstamp *tstamp;
302 tstamp = nf_conn_tstamp_find(ct);
306 nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
308 goto nla_put_failure;
310 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
311 CTA_TIMESTAMP_PAD) ||
312 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
313 cpu_to_be64(tstamp->stop),
315 goto nla_put_failure;
316 nla_nest_end(skb, nest_count);
324 #ifdef CONFIG_NF_CONNTRACK_MARK
325 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
327 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
328 goto nla_put_failure;
335 #define ctnetlink_dump_mark(a, b) (0)
338 #ifdef CONFIG_NF_CONNTRACK_SECMARK
339 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
341 struct nlattr *nest_secctx;
345 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
350 nest_secctx = nla_nest_start(skb, CTA_SECCTX);
352 goto nla_put_failure;
354 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
355 goto nla_put_failure;
356 nla_nest_end(skb, nest_secctx);
360 security_release_secctx(secctx, len);
364 #define ctnetlink_dump_secctx(a, b) (0)
367 #ifdef CONFIG_NF_CONNTRACK_LABELS
368 static inline int ctnetlink_label_size(const struct nf_conn *ct)
370 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
374 return nla_total_size(sizeof(labels->bits));
378 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
380 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
388 if (labels->bits[i] != 0)
389 return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
392 } while (i < ARRAY_SIZE(labels->bits));
397 #define ctnetlink_dump_labels(a, b) (0)
398 #define ctnetlink_label_size(a) (0)
401 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
403 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
405 struct nlattr *nest_parms;
407 if (!(ct->status & IPS_EXPECTED))
410 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
412 goto nla_put_failure;
413 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
414 goto nla_put_failure;
415 nla_nest_end(skb, nest_parms);
424 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
426 struct nlattr *nest_parms;
428 nest_parms = nla_nest_start(skb, type);
430 goto nla_put_failure;
432 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
433 htonl(seq->correction_pos)) ||
434 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
435 htonl(seq->offset_before)) ||
436 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
437 htonl(seq->offset_after)))
438 goto nla_put_failure;
440 nla_nest_end(skb, nest_parms);
448 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
450 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
451 struct nf_ct_seqadj *seq;
453 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
456 spin_lock_bh(&ct->lock);
457 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
458 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
461 seq = &seqadj->seq[IP_CT_DIR_REPLY];
462 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
465 spin_unlock_bh(&ct->lock);
468 spin_unlock_bh(&ct->lock);
472 static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
474 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
475 struct nlattr *nest_parms;
480 nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
482 goto nla_put_failure;
484 if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
485 nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
486 nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
487 goto nla_put_failure;
489 nla_nest_end(skb, nest_parms);
497 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
499 __be32 id = (__force __be32)nf_ct_get_id(ct);
501 if (nla_put_be32(skb, CTA_ID, id))
502 goto nla_put_failure;
509 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
511 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
512 goto nla_put_failure;
519 /* all these functions access ct->ext. Caller must either hold a reference
520 * on ct or prevent its deletion by holding either the bucket spinlock or
521 * pcpu dying list lock.
523 static int ctnetlink_dump_extinfo(struct sk_buff *skb,
524 struct nf_conn *ct, u32 type)
526 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
527 ctnetlink_dump_timestamp(skb, ct) < 0 ||
528 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
529 ctnetlink_dump_labels(skb, ct) < 0 ||
530 ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
531 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
537 static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
539 if (ctnetlink_dump_status(skb, ct) < 0 ||
540 ctnetlink_dump_mark(skb, ct) < 0 ||
541 ctnetlink_dump_secctx(skb, ct) < 0 ||
542 ctnetlink_dump_id(skb, ct) < 0 ||
543 ctnetlink_dump_use(skb, ct) < 0 ||
544 ctnetlink_dump_master(skb, ct) < 0)
547 if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
548 (ctnetlink_dump_timeout(skb, ct, false) < 0 ||
549 ctnetlink_dump_protoinfo(skb, ct, false) < 0))
556 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
557 struct nf_conn *ct, bool extinfo, unsigned int flags)
559 const struct nf_conntrack_zone *zone;
560 struct nlmsghdr *nlh;
561 struct nlattr *nest_parms;
565 flags |= NLM_F_MULTI;
566 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
567 nlh = nfnl_msg_put(skb, portid, seq, event, flags, nf_ct_l3num(ct),
572 zone = nf_ct_zone(ct);
574 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
576 goto nla_put_failure;
577 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
578 goto nla_put_failure;
579 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
580 NF_CT_ZONE_DIR_ORIG) < 0)
581 goto nla_put_failure;
582 nla_nest_end(skb, nest_parms);
584 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
586 goto nla_put_failure;
587 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
588 goto nla_put_failure;
589 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
590 NF_CT_ZONE_DIR_REPL) < 0)
591 goto nla_put_failure;
592 nla_nest_end(skb, nest_parms);
594 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
595 NF_CT_DEFAULT_ZONE_DIR) < 0)
596 goto nla_put_failure;
598 if (ctnetlink_dump_info(skb, ct) < 0)
599 goto nla_put_failure;
600 if (extinfo && ctnetlink_dump_extinfo(skb, ct, type) < 0)
601 goto nla_put_failure;
608 nlmsg_cancel(skb, nlh);
612 static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
613 [CTA_IP_V4_SRC] = { .type = NLA_U32 },
614 [CTA_IP_V4_DST] = { .type = NLA_U32 },
615 [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
616 [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
619 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
620 static size_t ctnetlink_proto_size(const struct nf_conn *ct)
622 const struct nf_conntrack_l4proto *l4proto;
623 size_t len, len4 = 0;
625 len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
626 len *= 3u; /* ORIG, REPLY, MASTER */
628 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
629 len += l4proto->nlattr_size;
630 if (l4proto->nlattr_tuple_size) {
631 len4 = l4proto->nlattr_tuple_size();
632 len4 *= 3u; /* ORIG, REPLY, MASTER */
639 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
641 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
643 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
644 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
645 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
649 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
651 #ifdef CONFIG_NF_CONNTRACK_SECMARK
654 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
658 return nla_total_size(0) /* CTA_SECCTX */
659 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
665 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
667 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
668 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
670 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
676 #ifdef CONFIG_NF_CONNTRACK_EVENTS
677 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
679 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
680 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
681 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
682 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
683 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
684 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
685 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
686 + ctnetlink_acct_size(ct)
687 + ctnetlink_timestamp_size(ct)
688 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
689 + nla_total_size(0) /* CTA_PROTOINFO */
690 + nla_total_size(0) /* CTA_HELP */
691 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
692 + ctnetlink_secctx_size(ct)
693 #if IS_ENABLED(CONFIG_NF_NAT)
694 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
695 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
697 #ifdef CONFIG_NF_CONNTRACK_MARK
698 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
700 #ifdef CONFIG_NF_CONNTRACK_ZONES
701 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
703 + ctnetlink_proto_size(ct)
704 + ctnetlink_label_size(ct)
709 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
711 const struct nf_conntrack_zone *zone;
713 struct nlmsghdr *nlh;
714 struct nlattr *nest_parms;
715 struct nf_conn *ct = item->ct;
718 unsigned int flags = 0, group;
721 if (events & (1 << IPCT_DESTROY)) {
722 type = IPCTNL_MSG_CT_DELETE;
723 group = NFNLGRP_CONNTRACK_DESTROY;
724 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
725 type = IPCTNL_MSG_CT_NEW;
726 flags = NLM_F_CREATE|NLM_F_EXCL;
727 group = NFNLGRP_CONNTRACK_NEW;
729 type = IPCTNL_MSG_CT_NEW;
730 group = NFNLGRP_CONNTRACK_UPDATE;
735 if (!item->report && !nfnetlink_has_listeners(net, group))
738 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
742 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
743 nlh = nfnl_msg_put(skb, item->portid, 0, type, flags, nf_ct_l3num(ct),
748 zone = nf_ct_zone(ct);
750 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
752 goto nla_put_failure;
753 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
754 goto nla_put_failure;
755 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
756 NF_CT_ZONE_DIR_ORIG) < 0)
757 goto nla_put_failure;
758 nla_nest_end(skb, nest_parms);
760 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
762 goto nla_put_failure;
763 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
764 goto nla_put_failure;
765 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
766 NF_CT_ZONE_DIR_REPL) < 0)
767 goto nla_put_failure;
768 nla_nest_end(skb, nest_parms);
770 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
771 NF_CT_DEFAULT_ZONE_DIR) < 0)
772 goto nla_put_failure;
774 if (ctnetlink_dump_id(skb, ct) < 0)
775 goto nla_put_failure;
777 if (ctnetlink_dump_status(skb, ct) < 0)
778 goto nla_put_failure;
780 if (events & (1 << IPCT_DESTROY)) {
781 if (ctnetlink_dump_timeout(skb, ct, true) < 0)
782 goto nla_put_failure;
784 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
785 ctnetlink_dump_timestamp(skb, ct) < 0 ||
786 ctnetlink_dump_protoinfo(skb, ct, true) < 0)
787 goto nla_put_failure;
789 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
790 goto nla_put_failure;
792 if (events & (1 << IPCT_PROTOINFO) &&
793 ctnetlink_dump_protoinfo(skb, ct, false) < 0)
794 goto nla_put_failure;
796 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
797 && ctnetlink_dump_helpinfo(skb, ct) < 0)
798 goto nla_put_failure;
800 #ifdef CONFIG_NF_CONNTRACK_SECMARK
801 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
802 && ctnetlink_dump_secctx(skb, ct) < 0)
803 goto nla_put_failure;
805 if (events & (1 << IPCT_LABEL) &&
806 ctnetlink_dump_labels(skb, ct) < 0)
807 goto nla_put_failure;
809 if (events & (1 << IPCT_RELATED) &&
810 ctnetlink_dump_master(skb, ct) < 0)
811 goto nla_put_failure;
813 if (events & (1 << IPCT_SEQADJ) &&
814 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
815 goto nla_put_failure;
817 if (events & (1 << IPCT_SYNPROXY) &&
818 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
819 goto nla_put_failure;
822 #ifdef CONFIG_NF_CONNTRACK_MARK
823 if ((events & (1 << IPCT_MARK) || ct->mark)
824 && ctnetlink_dump_mark(skb, ct) < 0)
825 goto nla_put_failure;
828 err = nfnetlink_send(skb, net, item->portid, group, item->report,
830 if (err == -ENOBUFS || err == -EAGAIN)
836 nlmsg_cancel(skb, nlh);
840 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
845 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
847 static int ctnetlink_done(struct netlink_callback *cb)
850 nf_ct_put((struct nf_conn *)cb->args[1]);
855 struct ctnetlink_filter {
858 u_int32_t orig_flags;
859 u_int32_t reply_flags;
861 struct nf_conntrack_tuple orig;
862 struct nf_conntrack_tuple reply;
863 struct nf_conntrack_zone zone;
871 static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
872 [CTA_FILTER_ORIG_FLAGS] = { .type = NLA_U32 },
873 [CTA_FILTER_REPLY_FLAGS] = { .type = NLA_U32 },
876 static int ctnetlink_parse_filter(const struct nlattr *attr,
877 struct ctnetlink_filter *filter)
879 struct nlattr *tb[CTA_FILTER_MAX + 1];
882 ret = nla_parse_nested(tb, CTA_FILTER_MAX, attr, cta_filter_nla_policy,
887 if (tb[CTA_FILTER_ORIG_FLAGS]) {
888 filter->orig_flags = nla_get_u32(tb[CTA_FILTER_ORIG_FLAGS]);
889 if (filter->orig_flags & ~CTA_FILTER_F_ALL)
893 if (tb[CTA_FILTER_REPLY_FLAGS]) {
894 filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
895 if (filter->reply_flags & ~CTA_FILTER_F_ALL)
902 static int ctnetlink_parse_zone(const struct nlattr *attr,
903 struct nf_conntrack_zone *zone);
904 static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
905 struct nf_conntrack_tuple *tuple,
906 u32 type, u_int8_t l3num,
907 struct nf_conntrack_zone *zone,
910 static struct ctnetlink_filter *
911 ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
913 struct ctnetlink_filter *filter;
916 #ifndef CONFIG_NF_CONNTRACK_MARK
917 if (cda[CTA_MARK] || cda[CTA_MARK_MASK])
918 return ERR_PTR(-EOPNOTSUPP);
921 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
923 return ERR_PTR(-ENOMEM);
925 filter->family = family;
927 #ifdef CONFIG_NF_CONNTRACK_MARK
929 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
930 if (cda[CTA_MARK_MASK])
931 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
933 filter->mark.mask = 0xffffffff;
934 } else if (cda[CTA_MARK_MASK]) {
939 if (!cda[CTA_FILTER])
942 err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
946 err = ctnetlink_parse_filter(cda[CTA_FILTER], filter);
950 if (filter->orig_flags) {
951 if (!cda[CTA_TUPLE_ORIG]) {
956 err = ctnetlink_parse_tuple_filter(cda, &filter->orig,
965 if (filter->reply_flags) {
966 if (!cda[CTA_TUPLE_REPLY]) {
971 err = ctnetlink_parse_tuple_filter(cda, &filter->reply,
990 static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
992 return family || cda[CTA_MARK] || cda[CTA_FILTER];
995 static int ctnetlink_start(struct netlink_callback *cb)
997 const struct nlattr * const *cda = cb->data;
998 struct ctnetlink_filter *filter = NULL;
999 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1000 u8 family = nfmsg->nfgen_family;
1002 if (ctnetlink_needs_filter(family, cda)) {
1003 filter = ctnetlink_alloc_filter(cda, family);
1005 return PTR_ERR(filter);
1012 static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
1013 struct nf_conntrack_tuple *ct_tuple,
1014 u_int32_t flags, int family)
1018 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1019 filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
1022 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1023 filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
1027 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1028 !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
1029 &ct_tuple->src.u3.in6))
1032 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1033 !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
1034 &ct_tuple->dst.u3.in6))
1039 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
1040 filter_tuple->dst.protonum != ct_tuple->dst.protonum)
1043 switch (ct_tuple->dst.protonum) {
1046 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
1047 filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
1050 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
1051 filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
1055 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
1056 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1058 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
1059 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1061 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
1062 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1065 case IPPROTO_ICMPV6:
1066 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
1067 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1069 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
1070 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1072 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
1073 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1081 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
1083 struct ctnetlink_filter *filter = data;
1084 struct nf_conntrack_tuple *tuple;
1089 /* Match entries of a given L3 protocol number.
1090 * If it is not specified, ie. l3proto == 0,
1091 * then match everything.
1093 if (filter->family && nf_ct_l3num(ct) != filter->family)
1096 if (filter->orig_flags) {
1097 tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
1098 if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
1104 if (filter->reply_flags) {
1105 tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
1106 if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
1107 filter->reply_flags,
1112 #ifdef CONFIG_NF_CONNTRACK_MARK
1113 if ((ct->mark & filter->mark.mask) != filter->mark.val)
1125 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1127 unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
1128 struct net *net = sock_net(skb->sk);
1129 struct nf_conn *ct, *last;
1130 struct nf_conntrack_tuple_hash *h;
1131 struct hlist_nulls_node *n;
1132 struct nf_conn *nf_ct_evict[8];
1136 last = (struct nf_conn *)cb->args[1];
1140 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
1144 if (nf_ct_should_gc(nf_ct_evict[i]))
1145 nf_ct_kill(nf_ct_evict[i]);
1146 nf_ct_put(nf_ct_evict[i]);
1149 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
1150 nf_conntrack_lock(lockp);
1151 if (cb->args[0] >= nf_conntrack_htable_size) {
1155 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
1157 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
1159 ct = nf_ct_tuplehash_to_ctrack(h);
1160 if (nf_ct_is_expired(ct)) {
1161 if (i < ARRAY_SIZE(nf_ct_evict) &&
1162 atomic_inc_not_zero(&ct->ct_general.use))
1163 nf_ct_evict[i++] = ct;
1167 if (!net_eq(net, nf_ct_net(ct)))
1175 if (!ctnetlink_filter_match(ct, cb->data))
1179 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1181 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1184 nf_conntrack_get(&ct->ct_general);
1185 cb->args[1] = (unsigned long)ct;
1199 /* nf ct hash resize happened, now clear the leftover. */
1200 if ((struct nf_conn *)cb->args[1] == last)
1208 if (nf_ct_should_gc(nf_ct_evict[i]))
1209 nf_ct_kill(nf_ct_evict[i]);
1210 nf_ct_put(nf_ct_evict[i]);
1216 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
1217 struct nf_conntrack_tuple *t,
1220 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1221 if (!tb[CTA_IP_V4_SRC])
1224 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1227 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1228 if (!tb[CTA_IP_V4_DST])
1231 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1237 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1238 struct nf_conntrack_tuple *t,
1241 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1242 if (!tb[CTA_IP_V6_SRC])
1245 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1248 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1249 if (!tb[CTA_IP_V6_DST])
1252 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1258 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1259 struct nf_conntrack_tuple *tuple,
1262 struct nlattr *tb[CTA_IP_MAX+1];
1265 ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
1269 ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
1270 cta_ip_nla_policy, NULL);
1274 switch (tuple->src.l3num) {
1276 ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
1279 ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
1286 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1287 [CTA_PROTO_NUM] = { .type = NLA_U8 },
1290 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1291 struct nf_conntrack_tuple *tuple,
1294 const struct nf_conntrack_l4proto *l4proto;
1295 struct nlattr *tb[CTA_PROTO_MAX+1];
1298 ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1299 proto_nla_policy, NULL);
1303 if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
1306 if (!tb[CTA_PROTO_NUM])
1309 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1312 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1314 if (likely(l4proto->nlattr_to_tuple)) {
1315 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1316 l4proto->nla_policy,
1319 ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
1328 ctnetlink_parse_zone(const struct nlattr *attr,
1329 struct nf_conntrack_zone *zone)
1331 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1332 NF_CT_DEFAULT_ZONE_DIR, 0);
1333 #ifdef CONFIG_NF_CONNTRACK_ZONES
1335 zone->id = ntohs(nla_get_be16(attr));
1344 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1345 struct nf_conntrack_zone *zone)
1349 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1352 ret = ctnetlink_parse_zone(attr, zone);
1356 if (type == CTA_TUPLE_REPLY)
1357 zone->dir = NF_CT_ZONE_DIR_REPL;
1359 zone->dir = NF_CT_ZONE_DIR_ORIG;
1364 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1365 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1366 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1367 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1370 #define CTA_FILTER_F_ALL_CTA_PROTO \
1371 (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
1372 CTA_FILTER_F_CTA_PROTO_DST_PORT | \
1373 CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
1374 CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
1375 CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
1376 CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
1377 CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
1378 CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
1381 ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
1382 struct nf_conntrack_tuple *tuple, u32 type,
1383 u_int8_t l3num, struct nf_conntrack_zone *zone,
1386 struct nlattr *tb[CTA_TUPLE_MAX+1];
1389 memset(tuple, 0, sizeof(*tuple));
1391 err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1392 tuple_nla_policy, NULL);
1396 if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1398 tuple->src.l3num = l3num;
1400 if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
1401 flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1402 if (!tb[CTA_TUPLE_IP])
1405 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
1410 if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
1411 if (!tb[CTA_TUPLE_PROTO])
1414 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
1417 } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
1418 /* Can't manage proto flags without a protonum */
1422 if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
1426 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1432 /* orig and expect tuples get DIR_ORIGINAL */
1433 if (type == CTA_TUPLE_REPLY)
1434 tuple->dst.dir = IP_CT_DIR_REPLY;
1436 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1442 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1443 struct nf_conntrack_tuple *tuple, u32 type,
1444 u_int8_t l3num, struct nf_conntrack_zone *zone)
1446 return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
1447 CTA_FILTER_FLAG(ALL));
1450 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1451 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1452 .len = NF_CT_HELPER_NAME_LEN - 1 },
1455 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1456 struct nlattr **helpinfo)
1459 struct nlattr *tb[CTA_HELP_MAX+1];
1461 err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1462 help_nla_policy, NULL);
1466 if (!tb[CTA_HELP_NAME])
1469 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1471 if (tb[CTA_HELP_INFO])
1472 *helpinfo = tb[CTA_HELP_INFO];
1477 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1478 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1479 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1480 [CTA_STATUS] = { .type = NLA_U32 },
1481 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1482 [CTA_HELP] = { .type = NLA_NESTED },
1483 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1484 [CTA_TIMEOUT] = { .type = NLA_U32 },
1485 [CTA_MARK] = { .type = NLA_U32 },
1486 [CTA_ID] = { .type = NLA_U32 },
1487 [CTA_NAT_DST] = { .type = NLA_NESTED },
1488 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1489 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1490 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1491 [CTA_ZONE] = { .type = NLA_U16 },
1492 [CTA_MARK_MASK] = { .type = NLA_U32 },
1493 [CTA_LABELS] = { .type = NLA_BINARY,
1494 .len = NF_CT_LABELS_MAX_SIZE },
1495 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1496 .len = NF_CT_LABELS_MAX_SIZE },
1497 [CTA_FILTER] = { .type = NLA_NESTED },
1500 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1502 if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1505 return ctnetlink_filter_match(ct, data);
1508 static int ctnetlink_flush_conntrack(struct net *net,
1509 const struct nlattr * const cda[],
1510 u32 portid, int report, u8 family)
1512 struct ctnetlink_filter *filter = NULL;
1514 if (ctnetlink_needs_filter(family, cda)) {
1515 if (cda[CTA_FILTER])
1518 filter = ctnetlink_alloc_filter(cda, family);
1520 return PTR_ERR(filter);
1523 nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
1530 static int ctnetlink_del_conntrack(struct sk_buff *skb,
1531 const struct nfnl_info *info,
1532 const struct nlattr * const cda[])
1534 u8 family = info->nfmsg->nfgen_family;
1535 struct nf_conntrack_tuple_hash *h;
1536 struct nf_conntrack_tuple tuple;
1537 struct nf_conntrack_zone zone;
1541 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1545 if (cda[CTA_TUPLE_ORIG])
1546 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1548 else if (cda[CTA_TUPLE_REPLY])
1549 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1552 u_int8_t u3 = info->nfmsg->version ? family : AF_UNSPEC;
1554 return ctnetlink_flush_conntrack(info->net, cda,
1555 NETLINK_CB(skb).portid,
1556 nlmsg_report(info->nlh), u3);
1562 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1566 ct = nf_ct_tuplehash_to_ctrack(h);
1568 if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1574 __be32 id = nla_get_be32(cda[CTA_ID]);
1576 if (id != (__force __be32)nf_ct_get_id(ct)) {
1582 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(info->nlh));
1588 static int ctnetlink_get_conntrack(struct sk_buff *skb,
1589 const struct nfnl_info *info,
1590 const struct nlattr * const cda[])
1592 u_int8_t u3 = info->nfmsg->nfgen_family;
1593 struct nf_conntrack_tuple_hash *h;
1594 struct nf_conntrack_tuple tuple;
1595 struct nf_conntrack_zone zone;
1596 struct sk_buff *skb2;
1600 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1601 struct netlink_dump_control c = {
1602 .start = ctnetlink_start,
1603 .dump = ctnetlink_dump_table,
1604 .done = ctnetlink_done,
1605 .data = (void *)cda,
1608 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1611 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1615 if (cda[CTA_TUPLE_ORIG])
1616 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1618 else if (cda[CTA_TUPLE_REPLY])
1619 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1627 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1631 ct = nf_ct_tuplehash_to_ctrack(h);
1633 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1639 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid,
1640 info->nlh->nlmsg_seq,
1641 NFNL_MSG_TYPE(info->nlh->nlmsg_type), ct,
1649 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
1652 static int ctnetlink_done_list(struct netlink_callback *cb)
1655 nf_ct_put((struct nf_conn *)cb->args[1]);
1660 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1662 struct nf_conn *ct, *last;
1663 struct nf_conntrack_tuple_hash *h;
1664 struct hlist_nulls_node *n;
1665 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1666 u_int8_t l3proto = nfmsg->nfgen_family;
1669 struct hlist_nulls_head *list;
1670 struct net *net = sock_net(skb->sk);
1675 last = (struct nf_conn *)cb->args[1];
1677 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1678 struct ct_pcpu *pcpu;
1680 if (!cpu_possible(cpu))
1683 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1684 spin_lock_bh(&pcpu->lock);
1685 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1687 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1688 ct = nf_ct_tuplehash_to_ctrack(h);
1689 if (l3proto && nf_ct_l3num(ct) != l3proto)
1697 /* We can't dump extension info for the unconfirmed
1698 * list because unconfirmed conntracks can have
1699 * ct->ext reallocated (and thus freed).
1701 * In the dying list case ct->ext can't be free'd
1702 * until after we drop pcpu->lock.
1704 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1706 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1707 ct, dying ? true : false, 0);
1709 if (!atomic_inc_not_zero(&ct->ct_general.use))
1712 cb->args[1] = (unsigned long)ct;
1713 spin_unlock_bh(&pcpu->lock);
1721 spin_unlock_bh(&pcpu->lock);
1732 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1734 return ctnetlink_dump_list(skb, cb, true);
1737 static int ctnetlink_get_ct_dying(struct sk_buff *skb,
1738 const struct nfnl_info *info,
1739 const struct nlattr * const cda[])
1741 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1742 struct netlink_dump_control c = {
1743 .dump = ctnetlink_dump_dying,
1744 .done = ctnetlink_done_list,
1746 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1753 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1755 return ctnetlink_dump_list(skb, cb, false);
1758 static int ctnetlink_get_ct_unconfirmed(struct sk_buff *skb,
1759 const struct nfnl_info *info,
1760 const struct nlattr * const cda[])
1762 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1763 struct netlink_dump_control c = {
1764 .dump = ctnetlink_dump_unconfirmed,
1765 .done = ctnetlink_done_list,
1767 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1773 #if IS_ENABLED(CONFIG_NF_NAT)
1775 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1776 enum nf_nat_manip_type manip,
1777 const struct nlattr *attr)
1780 struct nf_nat_hook *nat_hook;
1783 nat_hook = rcu_dereference(nf_nat_hook);
1785 #ifdef CONFIG_MODULES
1787 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1788 if (request_module("nf-nat") < 0) {
1789 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1793 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1795 nat_hook = rcu_dereference(nf_nat_hook);
1802 err = nat_hook->parse_nat_setup(ct, manip, attr);
1803 if (err == -EAGAIN) {
1804 #ifdef CONFIG_MODULES
1806 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1807 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1808 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1812 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1823 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1828 /* Ignore these unchangable bits */
1829 on &= ~IPS_UNCHANGEABLE_MASK;
1830 off &= ~IPS_UNCHANGEABLE_MASK;
1832 for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1833 if (on & (1 << bit))
1834 set_bit(bit, &ct->status);
1835 else if (off & (1 << bit))
1836 clear_bit(bit, &ct->status);
1841 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1844 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1845 d = ct->status ^ status;
1847 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1851 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1852 /* SEEN_REPLY bit can only be set */
1855 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1856 /* ASSURED bit can only be set */
1859 __ctnetlink_change_status(ct, status, 0);
1864 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1866 #if IS_ENABLED(CONFIG_NF_NAT)
1869 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1872 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1877 return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1880 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1886 static int ctnetlink_change_helper(struct nf_conn *ct,
1887 const struct nlattr * const cda[])
1889 struct nf_conntrack_helper *helper;
1890 struct nf_conn_help *help = nfct_help(ct);
1891 char *helpname = NULL;
1892 struct nlattr *helpinfo = NULL;
1895 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1899 /* don't change helper of sibling connections */
1901 /* If we try to change the helper to the same thing twice,
1902 * treat the second attempt as a no-op instead of returning
1908 helper = rcu_dereference(help->helper);
1909 if (helper && !strcmp(helper->name, helpname))
1917 if (!strcmp(helpname, "")) {
1918 if (help && help->helper) {
1919 /* we had a helper before ... */
1920 nf_ct_remove_expectations(ct);
1921 RCU_INIT_POINTER(help->helper, NULL);
1928 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1929 nf_ct_protonum(ct));
1930 if (helper == NULL) {
1936 if (help->helper == helper) {
1937 /* update private helper data if allowed. */
1938 if (helper->from_nlattr)
1939 helper->from_nlattr(helpinfo, ct);
1944 /* we cannot set a helper for an existing conntrack */
1952 static int ctnetlink_change_timeout(struct nf_conn *ct,
1953 const struct nlattr * const cda[])
1955 u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1957 if (timeout > INT_MAX)
1959 ct->timeout = nfct_time_stamp + (u32)timeout;
1961 if (test_bit(IPS_DYING_BIT, &ct->status))
1967 #if defined(CONFIG_NF_CONNTRACK_MARK)
1968 static void ctnetlink_change_mark(struct nf_conn *ct,
1969 const struct nlattr * const cda[])
1971 u32 mark, newmark, mask = 0;
1973 if (cda[CTA_MARK_MASK])
1974 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1976 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1977 newmark = (ct->mark & mask) ^ mark;
1978 if (newmark != ct->mark)
1983 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1984 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1985 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1986 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1989 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
1990 const struct nlattr * const cda[])
1992 const struct nlattr *attr = cda[CTA_PROTOINFO];
1993 const struct nf_conntrack_l4proto *l4proto;
1994 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1997 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
1998 protoinfo_policy, NULL);
2002 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
2003 if (l4proto->from_nlattr)
2004 err = l4proto->from_nlattr(tb, ct);
2009 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
2010 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
2011 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
2012 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
2015 static int change_seq_adj(struct nf_ct_seqadj *seq,
2016 const struct nlattr * const attr)
2019 struct nlattr *cda[CTA_SEQADJ_MAX+1];
2021 err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
2022 seqadj_policy, NULL);
2026 if (!cda[CTA_SEQADJ_CORRECTION_POS])
2029 seq->correction_pos =
2030 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
2032 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
2035 seq->offset_before =
2036 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
2038 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
2042 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
2048 ctnetlink_change_seq_adj(struct nf_conn *ct,
2049 const struct nlattr * const cda[])
2051 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
2057 spin_lock_bh(&ct->lock);
2058 if (cda[CTA_SEQ_ADJ_ORIG]) {
2059 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
2060 cda[CTA_SEQ_ADJ_ORIG]);
2064 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2067 if (cda[CTA_SEQ_ADJ_REPLY]) {
2068 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
2069 cda[CTA_SEQ_ADJ_REPLY]);
2073 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2076 spin_unlock_bh(&ct->lock);
2079 spin_unlock_bh(&ct->lock);
2083 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
2084 [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
2085 [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
2086 [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
2089 static int ctnetlink_change_synproxy(struct nf_conn *ct,
2090 const struct nlattr * const cda[])
2092 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
2093 struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
2099 err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
2100 cda[CTA_SYNPROXY], synproxy_policy,
2105 if (!tb[CTA_SYNPROXY_ISN] ||
2106 !tb[CTA_SYNPROXY_ITS] ||
2107 !tb[CTA_SYNPROXY_TSOFF])
2110 synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
2111 synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
2112 synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
2118 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
2120 #ifdef CONFIG_NF_CONNTRACK_LABELS
2121 size_t len = nla_len(cda[CTA_LABELS]);
2122 const void *mask = cda[CTA_LABELS_MASK];
2124 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
2128 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
2129 nla_len(cda[CTA_LABELS_MASK]) != len)
2131 mask = nla_data(cda[CTA_LABELS_MASK]);
2136 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
2143 ctnetlink_change_conntrack(struct nf_conn *ct,
2144 const struct nlattr * const cda[])
2148 /* only allow NAT changes and master assignation for new conntracks */
2149 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
2152 if (cda[CTA_HELP]) {
2153 err = ctnetlink_change_helper(ct, cda);
2158 if (cda[CTA_TIMEOUT]) {
2159 err = ctnetlink_change_timeout(ct, cda);
2164 if (cda[CTA_STATUS]) {
2165 err = ctnetlink_change_status(ct, cda);
2170 if (cda[CTA_PROTOINFO]) {
2171 err = ctnetlink_change_protoinfo(ct, cda);
2176 #if defined(CONFIG_NF_CONNTRACK_MARK)
2178 ctnetlink_change_mark(ct, cda);
2181 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2182 err = ctnetlink_change_seq_adj(ct, cda);
2187 if (cda[CTA_SYNPROXY]) {
2188 err = ctnetlink_change_synproxy(ct, cda);
2193 if (cda[CTA_LABELS]) {
2194 err = ctnetlink_attach_labels(ct, cda);
2202 static struct nf_conn *
2203 ctnetlink_create_conntrack(struct net *net,
2204 const struct nf_conntrack_zone *zone,
2205 const struct nlattr * const cda[],
2206 struct nf_conntrack_tuple *otuple,
2207 struct nf_conntrack_tuple *rtuple,
2212 struct nf_conntrack_helper *helper;
2213 struct nf_conn_tstamp *tstamp;
2216 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
2218 return ERR_PTR(-ENOMEM);
2220 if (!cda[CTA_TIMEOUT])
2223 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2224 if (timeout > INT_MAX)
2226 ct->timeout = (u32)timeout + nfct_time_stamp;
2229 if (cda[CTA_HELP]) {
2230 char *helpname = NULL;
2231 struct nlattr *helpinfo = NULL;
2233 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
2237 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2238 nf_ct_protonum(ct));
2239 if (helper == NULL) {
2241 #ifdef CONFIG_MODULES
2242 if (request_module("nfct-helper-%s", helpname) < 0) {
2248 helper = __nf_conntrack_helper_find(helpname,
2250 nf_ct_protonum(ct));
2260 struct nf_conn_help *help;
2262 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2267 /* set private helper data if allowed. */
2268 if (helper->from_nlattr)
2269 helper->from_nlattr(helpinfo, ct);
2271 /* not in hash table yet so not strictly necessary */
2272 RCU_INIT_POINTER(help->helper, helper);
2275 /* try an implicit helper assignation */
2276 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
2281 err = ctnetlink_setup_nat(ct, cda);
2285 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2286 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2287 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2288 nf_ct_labels_ext_add(ct);
2289 nfct_seqadj_ext_add(ct);
2290 nfct_synproxy_ext_add(ct);
2292 /* we must add conntrack extensions before confirmation. */
2293 ct->status |= IPS_CONFIRMED;
2295 if (cda[CTA_STATUS]) {
2296 err = ctnetlink_change_status(ct, cda);
2301 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2302 err = ctnetlink_change_seq_adj(ct, cda);
2307 memset(&ct->proto, 0, sizeof(ct->proto));
2308 if (cda[CTA_PROTOINFO]) {
2309 err = ctnetlink_change_protoinfo(ct, cda);
2314 if (cda[CTA_SYNPROXY]) {
2315 err = ctnetlink_change_synproxy(ct, cda);
2320 #if defined(CONFIG_NF_CONNTRACK_MARK)
2322 ctnetlink_change_mark(ct, cda);
2325 /* setup master conntrack: this is a confirmed expectation */
2326 if (cda[CTA_TUPLE_MASTER]) {
2327 struct nf_conntrack_tuple master;
2328 struct nf_conntrack_tuple_hash *master_h;
2329 struct nf_conn *master_ct;
2331 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2336 master_h = nf_conntrack_find_get(net, zone, &master);
2337 if (master_h == NULL) {
2341 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2342 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2343 ct->master = master_ct;
2345 tstamp = nf_conn_tstamp_find(ct);
2347 tstamp->start = ktime_get_real_ns();
2349 err = nf_conntrack_hash_check_insert(ct);
2360 nf_conntrack_free(ct);
2361 return ERR_PTR(err);
2364 static int ctnetlink_new_conntrack(struct sk_buff *skb,
2365 const struct nfnl_info *info,
2366 const struct nlattr * const cda[])
2368 struct nf_conntrack_tuple otuple, rtuple;
2369 struct nf_conntrack_tuple_hash *h = NULL;
2370 u_int8_t u3 = info->nfmsg->nfgen_family;
2371 struct nf_conntrack_zone zone;
2375 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2379 if (cda[CTA_TUPLE_ORIG]) {
2380 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2386 if (cda[CTA_TUPLE_REPLY]) {
2387 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2393 if (cda[CTA_TUPLE_ORIG])
2394 h = nf_conntrack_find_get(info->net, &zone, &otuple);
2395 else if (cda[CTA_TUPLE_REPLY])
2396 h = nf_conntrack_find_get(info->net, &zone, &rtuple);
2400 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
2401 enum ip_conntrack_events events;
2403 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2405 if (otuple.dst.protonum != rtuple.dst.protonum)
2408 ct = ctnetlink_create_conntrack(info->net, &zone, cda,
2409 &otuple, &rtuple, u3);
2414 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2415 events = 1 << IPCT_RELATED;
2417 events = 1 << IPCT_NEW;
2419 if (cda[CTA_LABELS] &&
2420 ctnetlink_attach_labels(ct, cda) == 0)
2421 events |= (1 << IPCT_LABEL);
2423 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2424 (1 << IPCT_ASSURED) |
2425 (1 << IPCT_HELPER) |
2426 (1 << IPCT_PROTOINFO) |
2427 (1 << IPCT_SEQADJ) |
2429 (1 << IPCT_SYNPROXY) |
2431 ct, NETLINK_CB(skb).portid,
2432 nlmsg_report(info->nlh));
2438 /* implicit 'else' */
2441 ct = nf_ct_tuplehash_to_ctrack(h);
2442 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL)) {
2443 err = ctnetlink_change_conntrack(ct, cda);
2445 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2446 (1 << IPCT_ASSURED) |
2447 (1 << IPCT_HELPER) |
2449 (1 << IPCT_PROTOINFO) |
2450 (1 << IPCT_SEQADJ) |
2452 (1 << IPCT_SYNPROXY),
2453 ct, NETLINK_CB(skb).portid,
2454 nlmsg_report(info->nlh));
2463 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2464 __u16 cpu, const struct ip_conntrack_stat *st)
2466 struct nlmsghdr *nlh;
2467 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2469 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2470 IPCTNL_MSG_CT_GET_STATS_CPU);
2471 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2472 NFNETLINK_V0, htons(cpu));
2476 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2477 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2478 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2479 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2480 htonl(st->insert_failed)) ||
2481 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2482 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2483 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2484 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2485 htonl(st->search_restart)) ||
2486 nla_put_be32(skb, CTA_STATS_CLASH_RESOLVE,
2487 htonl(st->clash_resolve)))
2488 goto nla_put_failure;
2490 nlmsg_end(skb, nlh);
2495 nlmsg_cancel(skb, nlh);
2500 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2503 struct net *net = sock_net(skb->sk);
2505 if (cb->args[0] == nr_cpu_ids)
2508 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2509 const struct ip_conntrack_stat *st;
2511 if (!cpu_possible(cpu))
2514 st = per_cpu_ptr(net->ct.stat, cpu);
2515 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2516 NETLINK_CB(cb->skb).portid,
2526 static int ctnetlink_stat_ct_cpu(struct sk_buff *skb,
2527 const struct nfnl_info *info,
2528 const struct nlattr * const cda[])
2530 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
2531 struct netlink_dump_control c = {
2532 .dump = ctnetlink_ct_stat_cpu_dump,
2534 return netlink_dump_start(info->sk, skb, info->nlh, &c);
2541 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2544 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2545 unsigned int nr_conntracks;
2546 struct nlmsghdr *nlh;
2548 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2549 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2554 nr_conntracks = nf_conntrack_count(net);
2555 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2556 goto nla_put_failure;
2558 if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2559 goto nla_put_failure;
2561 nlmsg_end(skb, nlh);
2566 nlmsg_cancel(skb, nlh);
2570 static int ctnetlink_stat_ct(struct sk_buff *skb, const struct nfnl_info *info,
2571 const struct nlattr * const cda[])
2573 struct sk_buff *skb2;
2576 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2580 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2581 info->nlh->nlmsg_seq,
2582 NFNL_MSG_TYPE(info->nlh->nlmsg_type),
2589 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
2592 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2593 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2594 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2595 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2596 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2597 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2598 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2599 .len = NF_CT_HELPER_NAME_LEN - 1 },
2600 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2601 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2602 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2603 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2604 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2607 static struct nf_conntrack_expect *
2608 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2609 struct nf_conntrack_helper *helper,
2610 struct nf_conntrack_tuple *tuple,
2611 struct nf_conntrack_tuple *mask);
2613 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2615 ctnetlink_glue_build_size(const struct nf_conn *ct)
2617 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2618 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2619 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2620 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2621 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2622 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2623 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2624 + nla_total_size(0) /* CTA_PROTOINFO */
2625 + nla_total_size(0) /* CTA_HELP */
2626 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2627 + ctnetlink_secctx_size(ct)
2628 #if IS_ENABLED(CONFIG_NF_NAT)
2629 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2630 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2632 #ifdef CONFIG_NF_CONNTRACK_MARK
2633 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2635 #ifdef CONFIG_NF_CONNTRACK_ZONES
2636 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2638 + ctnetlink_proto_size(ct)
2642 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2644 const struct nf_conntrack_zone *zone;
2645 struct nlattr *nest_parms;
2647 zone = nf_ct_zone(ct);
2649 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2651 goto nla_put_failure;
2652 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2653 goto nla_put_failure;
2654 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2655 NF_CT_ZONE_DIR_ORIG) < 0)
2656 goto nla_put_failure;
2657 nla_nest_end(skb, nest_parms);
2659 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2661 goto nla_put_failure;
2662 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2663 goto nla_put_failure;
2664 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2665 NF_CT_ZONE_DIR_REPL) < 0)
2666 goto nla_put_failure;
2667 nla_nest_end(skb, nest_parms);
2669 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2670 NF_CT_DEFAULT_ZONE_DIR) < 0)
2671 goto nla_put_failure;
2673 if (ctnetlink_dump_id(skb, ct) < 0)
2674 goto nla_put_failure;
2676 if (ctnetlink_dump_status(skb, ct) < 0)
2677 goto nla_put_failure;
2679 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
2680 goto nla_put_failure;
2682 if (ctnetlink_dump_protoinfo(skb, ct, false) < 0)
2683 goto nla_put_failure;
2685 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2686 goto nla_put_failure;
2688 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2689 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2690 goto nla_put_failure;
2692 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2693 goto nla_put_failure;
2695 if ((ct->status & IPS_SEQ_ADJUST) &&
2696 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2697 goto nla_put_failure;
2699 if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2700 goto nla_put_failure;
2702 #ifdef CONFIG_NF_CONNTRACK_MARK
2703 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2704 goto nla_put_failure;
2706 if (ctnetlink_dump_labels(skb, ct) < 0)
2707 goto nla_put_failure;
2715 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2716 enum ip_conntrack_info ctinfo,
2717 u_int16_t ct_attr, u_int16_t ct_info_attr)
2719 struct nlattr *nest_parms;
2721 nest_parms = nla_nest_start(skb, ct_attr);
2723 goto nla_put_failure;
2725 if (__ctnetlink_glue_build(skb, ct) < 0)
2726 goto nla_put_failure;
2728 nla_nest_end(skb, nest_parms);
2730 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2731 goto nla_put_failure;
2740 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2742 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2743 unsigned long d = ct->status ^ status;
2745 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2746 /* SEEN_REPLY bit can only be set */
2749 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2750 /* ASSURED bit can only be set */
2753 /* This check is less strict than ctnetlink_change_status()
2754 * because callers often flip IPS_EXPECTED bits when sending
2755 * an NFQA_CT attribute to the kernel. So ignore the
2756 * unchangeable bits but do not error out. Also user programs
2757 * are allowed to clear the bits that they are allowed to change.
2759 __ctnetlink_change_status(ct, status, ~status);
2764 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2768 if (cda[CTA_TIMEOUT]) {
2769 err = ctnetlink_change_timeout(ct, cda);
2773 if (cda[CTA_STATUS]) {
2774 err = ctnetlink_update_status(ct, cda);
2778 if (cda[CTA_HELP]) {
2779 err = ctnetlink_change_helper(ct, cda);
2783 if (cda[CTA_LABELS]) {
2784 err = ctnetlink_attach_labels(ct, cda);
2788 #if defined(CONFIG_NF_CONNTRACK_MARK)
2789 if (cda[CTA_MARK]) {
2790 ctnetlink_change_mark(ct, cda);
2797 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2799 struct nlattr *cda[CTA_MAX+1];
2802 ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2807 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2810 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2811 const struct nf_conn *ct,
2812 struct nf_conntrack_tuple *tuple,
2813 struct nf_conntrack_tuple *mask)
2817 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2818 nf_ct_l3num(ct), NULL);
2822 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2823 nf_ct_l3num(ct), NULL);
2827 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2828 u32 portid, u32 report)
2830 struct nlattr *cda[CTA_EXPECT_MAX+1];
2831 struct nf_conntrack_tuple tuple, mask;
2832 struct nf_conntrack_helper *helper = NULL;
2833 struct nf_conntrack_expect *exp;
2836 err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2837 exp_nla_policy, NULL);
2841 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2846 if (cda[CTA_EXPECT_HELP_NAME]) {
2847 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2849 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2850 nf_ct_protonum(ct));
2855 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2856 helper, &tuple, &mask);
2858 return PTR_ERR(exp);
2860 err = nf_ct_expect_related_report(exp, portid, report, 0);
2861 nf_ct_expect_put(exp);
2865 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2866 enum ip_conntrack_info ctinfo, int diff)
2868 if (!(ct->status & IPS_NAT_MASK))
2871 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2874 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2875 .build_size = ctnetlink_glue_build_size,
2876 .build = ctnetlink_glue_build,
2877 .parse = ctnetlink_glue_parse,
2878 .attach_expect = ctnetlink_glue_attach_expect,
2879 .seq_adjust = ctnetlink_glue_seqadj,
2881 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2883 /***********************************************************************
2885 ***********************************************************************/
2887 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2888 const struct nf_conntrack_tuple *tuple,
2891 struct nlattr *nest_parms;
2893 nest_parms = nla_nest_start(skb, type);
2895 goto nla_put_failure;
2896 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2897 goto nla_put_failure;
2898 nla_nest_end(skb, nest_parms);
2906 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2907 const struct nf_conntrack_tuple *tuple,
2908 const struct nf_conntrack_tuple_mask *mask)
2910 const struct nf_conntrack_l4proto *l4proto;
2911 struct nf_conntrack_tuple m;
2912 struct nlattr *nest_parms;
2915 memset(&m, 0xFF, sizeof(m));
2916 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2917 m.src.u.all = mask->src.u.all;
2918 m.src.l3num = tuple->src.l3num;
2919 m.dst.protonum = tuple->dst.protonum;
2921 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2923 goto nla_put_failure;
2926 ret = ctnetlink_dump_tuples_ip(skb, &m);
2928 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2929 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2933 if (unlikely(ret < 0))
2934 goto nla_put_failure;
2936 nla_nest_end(skb, nest_parms);
2944 static const union nf_inet_addr any_addr;
2946 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2948 static __read_mostly siphash_key_t exp_id_seed;
2949 unsigned long a, b, c, d;
2951 net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
2953 a = (unsigned long)exp;
2954 b = (unsigned long)exp->helper;
2955 c = (unsigned long)exp->master;
2956 d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
2959 return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
2961 return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
2966 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2967 const struct nf_conntrack_expect *exp)
2969 struct nf_conn *master = exp->master;
2970 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2971 struct nf_conn_help *help;
2972 #if IS_ENABLED(CONFIG_NF_NAT)
2973 struct nlattr *nest_parms;
2974 struct nf_conntrack_tuple nat_tuple = {};
2976 struct nf_ct_helper_expectfn *expfn;
2981 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2982 goto nla_put_failure;
2983 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2984 goto nla_put_failure;
2985 if (ctnetlink_exp_dump_tuple(skb,
2986 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2987 CTA_EXPECT_MASTER) < 0)
2988 goto nla_put_failure;
2990 #if IS_ENABLED(CONFIG_NF_NAT)
2991 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2992 exp->saved_proto.all) {
2993 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
2995 goto nla_put_failure;
2997 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2998 goto nla_put_failure;
3000 nat_tuple.src.l3num = nf_ct_l3num(master);
3001 nat_tuple.src.u3 = exp->saved_addr;
3002 nat_tuple.dst.protonum = nf_ct_protonum(master);
3003 nat_tuple.src.u = exp->saved_proto;
3005 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
3006 CTA_EXPECT_NAT_TUPLE) < 0)
3007 goto nla_put_failure;
3008 nla_nest_end(skb, nest_parms);
3011 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
3012 nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
3013 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
3014 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
3015 goto nla_put_failure;
3016 help = nfct_help(master);
3018 struct nf_conntrack_helper *helper;
3020 helper = rcu_dereference(help->helper);
3022 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
3023 goto nla_put_failure;
3025 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
3026 if (expfn != NULL &&
3027 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
3028 goto nla_put_failure;
3037 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
3038 int event, const struct nf_conntrack_expect *exp)
3040 struct nlmsghdr *nlh;
3041 unsigned int flags = portid ? NLM_F_MULTI : 0;
3043 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
3044 nlh = nfnl_msg_put(skb, portid, seq, event, flags,
3045 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3049 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3050 goto nla_put_failure;
3052 nlmsg_end(skb, nlh);
3057 nlmsg_cancel(skb, nlh);
3061 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3063 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
3065 struct nf_conntrack_expect *exp = item->exp;
3066 struct net *net = nf_ct_exp_net(exp);
3067 struct nlmsghdr *nlh;
3068 struct sk_buff *skb;
3069 unsigned int type, group;
3072 if (events & (1 << IPEXP_DESTROY)) {
3073 type = IPCTNL_MSG_EXP_DELETE;
3074 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
3075 } else if (events & (1 << IPEXP_NEW)) {
3076 type = IPCTNL_MSG_EXP_NEW;
3077 flags = NLM_F_CREATE|NLM_F_EXCL;
3078 group = NFNLGRP_CONNTRACK_EXP_NEW;
3082 if (!item->report && !nfnetlink_has_listeners(net, group))
3085 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
3089 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
3090 nlh = nfnl_msg_put(skb, item->portid, 0, type, flags,
3091 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3095 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3096 goto nla_put_failure;
3098 nlmsg_end(skb, nlh);
3099 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
3103 nlmsg_cancel(skb, nlh);
3107 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
3111 static int ctnetlink_exp_done(struct netlink_callback *cb)
3114 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
3119 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3121 struct net *net = sock_net(skb->sk);
3122 struct nf_conntrack_expect *exp, *last;
3123 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3124 u_int8_t l3proto = nfmsg->nfgen_family;
3127 last = (struct nf_conntrack_expect *)cb->args[1];
3128 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
3130 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
3132 if (l3proto && exp->tuple.src.l3num != l3proto)
3135 if (!net_eq(nf_ct_net(exp->master), net))
3143 if (ctnetlink_exp_fill_info(skb,
3144 NETLINK_CB(cb->skb).portid,
3148 if (!refcount_inc_not_zero(&exp->use))
3150 cb->args[1] = (unsigned long)exp;
3162 nf_ct_expect_put(last);
3168 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3170 struct nf_conntrack_expect *exp, *last;
3171 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3172 struct nf_conn *ct = cb->data;
3173 struct nf_conn_help *help = nfct_help(ct);
3174 u_int8_t l3proto = nfmsg->nfgen_family;
3180 last = (struct nf_conntrack_expect *)cb->args[1];
3182 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
3183 if (l3proto && exp->tuple.src.l3num != l3proto)
3190 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
3194 if (!refcount_inc_not_zero(&exp->use))
3196 cb->args[1] = (unsigned long)exp;
3208 nf_ct_expect_put(last);
3213 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
3214 struct sk_buff *skb,
3215 const struct nlmsghdr *nlh,
3216 const struct nlattr * const cda[],
3217 struct netlink_ext_ack *extack)
3220 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3221 u_int8_t u3 = nfmsg->nfgen_family;
3222 struct nf_conntrack_tuple tuple;
3223 struct nf_conntrack_tuple_hash *h;
3225 struct nf_conntrack_zone zone;
3226 struct netlink_dump_control c = {
3227 .dump = ctnetlink_exp_ct_dump_table,
3228 .done = ctnetlink_exp_done,
3231 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3236 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3240 h = nf_conntrack_find_get(net, &zone, &tuple);
3244 ct = nf_ct_tuplehash_to_ctrack(h);
3245 /* No expectation linked to this connection tracking. */
3246 if (!nfct_help(ct)) {
3253 err = netlink_dump_start(ctnl, skb, nlh, &c);
3259 static int ctnetlink_get_expect(struct sk_buff *skb,
3260 const struct nfnl_info *info,
3261 const struct nlattr * const cda[])
3263 u_int8_t u3 = info->nfmsg->nfgen_family;
3264 struct nf_conntrack_tuple tuple;
3265 struct nf_conntrack_expect *exp;
3266 struct nf_conntrack_zone zone;
3267 struct sk_buff *skb2;
3270 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3271 if (cda[CTA_EXPECT_MASTER])
3272 return ctnetlink_dump_exp_ct(info->net, info->sk, skb,
3276 struct netlink_dump_control c = {
3277 .dump = ctnetlink_exp_dump_table,
3278 .done = ctnetlink_exp_done,
3280 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3284 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3288 if (cda[CTA_EXPECT_TUPLE])
3289 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3291 else if (cda[CTA_EXPECT_MASTER])
3292 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3300 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3304 if (cda[CTA_EXPECT_ID]) {
3305 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3307 if (id != nf_expect_get_id(exp)) {
3308 nf_ct_expect_put(exp);
3313 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3315 nf_ct_expect_put(exp);
3320 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3321 info->nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
3324 nf_ct_expect_put(exp);
3330 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
3333 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3335 const struct nf_conn_help *m_help;
3336 const char *name = data;
3338 m_help = nfct_help(exp->master);
3340 return strcmp(m_help->helper->name, name) == 0;
3343 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3348 static int ctnetlink_del_expect(struct sk_buff *skb,
3349 const struct nfnl_info *info,
3350 const struct nlattr * const cda[])
3352 u_int8_t u3 = info->nfmsg->nfgen_family;
3353 struct nf_conntrack_expect *exp;
3354 struct nf_conntrack_tuple tuple;
3355 struct nf_conntrack_zone zone;
3358 if (cda[CTA_EXPECT_TUPLE]) {
3359 /* delete a single expect by tuple */
3360 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3364 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3369 /* bump usage count to 2 */
3370 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3374 if (cda[CTA_EXPECT_ID]) {
3375 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3376 if (ntohl(id) != (u32)(unsigned long)exp) {
3377 nf_ct_expect_put(exp);
3382 /* after list removal, usage count == 1 */
3383 spin_lock_bh(&nf_conntrack_expect_lock);
3384 if (del_timer(&exp->timeout)) {
3385 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3386 nlmsg_report(info->nlh));
3387 nf_ct_expect_put(exp);
3389 spin_unlock_bh(&nf_conntrack_expect_lock);
3390 /* have to put what we 'get' above.
3391 * after this line usage count == 0 */
3392 nf_ct_expect_put(exp);
3393 } else if (cda[CTA_EXPECT_HELP_NAME]) {
3394 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3396 nf_ct_expect_iterate_net(info->net, expect_iter_name, name,
3397 NETLINK_CB(skb).portid,
3398 nlmsg_report(info->nlh));
3400 /* This basically means we have to flush everything*/
3401 nf_ct_expect_iterate_net(info->net, expect_iter_all, NULL,
3402 NETLINK_CB(skb).portid,
3403 nlmsg_report(info->nlh));
3409 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3410 const struct nlattr * const cda[])
3412 if (cda[CTA_EXPECT_TIMEOUT]) {
3413 if (!del_timer(&x->timeout))
3416 x->timeout.expires = jiffies +
3417 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3418 add_timer(&x->timeout);
3423 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3424 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3425 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3429 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3430 struct nf_conntrack_expect *exp,
3433 #if IS_ENABLED(CONFIG_NF_NAT)
3434 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3435 struct nf_conntrack_tuple nat_tuple = {};
3438 err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3439 exp_nat_nla_policy, NULL);
3443 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3446 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3447 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3452 exp->saved_addr = nat_tuple.src.u3;
3453 exp->saved_proto = nat_tuple.src.u;
3454 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3462 static struct nf_conntrack_expect *
3463 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3464 struct nf_conntrack_helper *helper,
3465 struct nf_conntrack_tuple *tuple,
3466 struct nf_conntrack_tuple *mask)
3468 u_int32_t class = 0;
3469 struct nf_conntrack_expect *exp;
3470 struct nf_conn_help *help;
3473 help = nfct_help(ct);
3475 return ERR_PTR(-EOPNOTSUPP);
3477 if (cda[CTA_EXPECT_CLASS] && helper) {
3478 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3479 if (class > helper->expect_class_max)
3480 return ERR_PTR(-EINVAL);
3482 exp = nf_ct_expect_alloc(ct);
3484 return ERR_PTR(-ENOMEM);
3486 if (cda[CTA_EXPECT_FLAGS]) {
3487 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3488 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3492 if (cda[CTA_EXPECT_FN]) {
3493 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3494 struct nf_ct_helper_expectfn *expfn;
3496 expfn = nf_ct_helper_expectfn_find_by_name(name);
3497 if (expfn == NULL) {
3501 exp->expectfn = expfn->expectfn;
3503 exp->expectfn = NULL;
3507 exp->helper = helper;
3508 exp->tuple = *tuple;
3509 exp->mask.src.u3 = mask->src.u3;
3510 exp->mask.src.u.all = mask->src.u.all;
3512 if (cda[CTA_EXPECT_NAT]) {
3513 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3514 exp, nf_ct_l3num(ct));
3520 nf_ct_expect_put(exp);
3521 return ERR_PTR(err);
3525 ctnetlink_create_expect(struct net *net,
3526 const struct nf_conntrack_zone *zone,
3527 const struct nlattr * const cda[],
3528 u_int8_t u3, u32 portid, int report)
3530 struct nf_conntrack_tuple tuple, mask, master_tuple;
3531 struct nf_conntrack_tuple_hash *h = NULL;
3532 struct nf_conntrack_helper *helper = NULL;
3533 struct nf_conntrack_expect *exp;
3537 /* caller guarantees that those three CTA_EXPECT_* exist */
3538 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3542 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3546 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3551 /* Look for master conntrack of this expectation */
3552 h = nf_conntrack_find_get(net, zone, &master_tuple);
3555 ct = nf_ct_tuplehash_to_ctrack(h);
3558 if (cda[CTA_EXPECT_HELP_NAME]) {
3559 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3561 helper = __nf_conntrack_helper_find(helpname, u3,
3562 nf_ct_protonum(ct));
3563 if (helper == NULL) {
3565 #ifdef CONFIG_MODULES
3566 if (request_module("nfct-helper-%s", helpname) < 0) {
3571 helper = __nf_conntrack_helper_find(helpname, u3,
3572 nf_ct_protonum(ct));
3584 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3590 err = nf_ct_expect_related_report(exp, portid, report, 0);
3591 nf_ct_expect_put(exp);
3599 static int ctnetlink_new_expect(struct sk_buff *skb,
3600 const struct nfnl_info *info,
3601 const struct nlattr * const cda[])
3603 u_int8_t u3 = info->nfmsg->nfgen_family;
3604 struct nf_conntrack_tuple tuple;
3605 struct nf_conntrack_expect *exp;
3606 struct nf_conntrack_zone zone;
3609 if (!cda[CTA_EXPECT_TUPLE]
3610 || !cda[CTA_EXPECT_MASK]
3611 || !cda[CTA_EXPECT_MASTER])
3614 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3618 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3623 spin_lock_bh(&nf_conntrack_expect_lock);
3624 exp = __nf_ct_expect_find(info->net, &zone, &tuple);
3626 spin_unlock_bh(&nf_conntrack_expect_lock);
3628 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
3629 err = ctnetlink_create_expect(info->net, &zone, cda, u3,
3630 NETLINK_CB(skb).portid,
3631 nlmsg_report(info->nlh));
3637 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL))
3638 err = ctnetlink_change_expect(exp, cda);
3639 spin_unlock_bh(&nf_conntrack_expect_lock);
3645 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3646 const struct ip_conntrack_stat *st)
3648 struct nlmsghdr *nlh;
3649 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3651 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3652 IPCTNL_MSG_EXP_GET_STATS_CPU);
3653 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
3654 NFNETLINK_V0, htons(cpu));
3658 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3659 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3660 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3661 goto nla_put_failure;
3663 nlmsg_end(skb, nlh);
3668 nlmsg_cancel(skb, nlh);
3673 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3676 struct net *net = sock_net(skb->sk);
3678 if (cb->args[0] == nr_cpu_ids)
3681 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3682 const struct ip_conntrack_stat *st;
3684 if (!cpu_possible(cpu))
3687 st = per_cpu_ptr(net->ct.stat, cpu);
3688 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3698 static int ctnetlink_stat_exp_cpu(struct sk_buff *skb,
3699 const struct nfnl_info *info,
3700 const struct nlattr * const cda[])
3702 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3703 struct netlink_dump_control c = {
3704 .dump = ctnetlink_exp_stat_cpu_dump,
3706 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3712 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3713 static struct nf_ct_event_notifier ctnl_notifier = {
3714 .fcn = ctnetlink_conntrack_event,
3717 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3718 .fcn = ctnetlink_expect_event,
3722 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3723 [IPCTNL_MSG_CT_NEW] = {
3724 .call = ctnetlink_new_conntrack,
3725 .type = NFNL_CB_MUTEX,
3726 .attr_count = CTA_MAX,
3727 .policy = ct_nla_policy
3729 [IPCTNL_MSG_CT_GET] = {
3730 .call = ctnetlink_get_conntrack,
3731 .type = NFNL_CB_MUTEX,
3732 .attr_count = CTA_MAX,
3733 .policy = ct_nla_policy
3735 [IPCTNL_MSG_CT_DELETE] = {
3736 .call = ctnetlink_del_conntrack,
3737 .type = NFNL_CB_MUTEX,
3738 .attr_count = CTA_MAX,
3739 .policy = ct_nla_policy
3741 [IPCTNL_MSG_CT_GET_CTRZERO] = {
3742 .call = ctnetlink_get_conntrack,
3743 .type = NFNL_CB_MUTEX,
3744 .attr_count = CTA_MAX,
3745 .policy = ct_nla_policy
3747 [IPCTNL_MSG_CT_GET_STATS_CPU] = {
3748 .call = ctnetlink_stat_ct_cpu,
3749 .type = NFNL_CB_MUTEX,
3751 [IPCTNL_MSG_CT_GET_STATS] = {
3752 .call = ctnetlink_stat_ct,
3753 .type = NFNL_CB_MUTEX,
3755 [IPCTNL_MSG_CT_GET_DYING] = {
3756 .call = ctnetlink_get_ct_dying,
3757 .type = NFNL_CB_MUTEX,
3759 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = {
3760 .call = ctnetlink_get_ct_unconfirmed,
3761 .type = NFNL_CB_MUTEX,
3765 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3766 [IPCTNL_MSG_EXP_GET] = {
3767 .call = ctnetlink_get_expect,
3768 .type = NFNL_CB_MUTEX,
3769 .attr_count = CTA_EXPECT_MAX,
3770 .policy = exp_nla_policy
3772 [IPCTNL_MSG_EXP_NEW] = {
3773 .call = ctnetlink_new_expect,
3774 .type = NFNL_CB_MUTEX,
3775 .attr_count = CTA_EXPECT_MAX,
3776 .policy = exp_nla_policy
3778 [IPCTNL_MSG_EXP_DELETE] = {
3779 .call = ctnetlink_del_expect,
3780 .type = NFNL_CB_MUTEX,
3781 .attr_count = CTA_EXPECT_MAX,
3782 .policy = exp_nla_policy
3784 [IPCTNL_MSG_EXP_GET_STATS_CPU] = {
3785 .call = ctnetlink_stat_exp_cpu,
3786 .type = NFNL_CB_MUTEX,
3790 static const struct nfnetlink_subsystem ctnl_subsys = {
3791 .name = "conntrack",
3792 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3793 .cb_count = IPCTNL_MSG_MAX,
3797 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3798 .name = "conntrack_expect",
3799 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3800 .cb_count = IPCTNL_MSG_EXP_MAX,
3804 MODULE_ALIAS("ip_conntrack_netlink");
3805 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3806 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3808 static int __net_init ctnetlink_net_init(struct net *net)
3810 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3813 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3815 pr_err("ctnetlink_init: cannot register notifier.\n");
3819 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3821 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3822 goto err_unreg_notifier;
3827 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3829 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3835 static void ctnetlink_net_exit(struct net *net)
3837 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3838 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3839 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3843 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3847 list_for_each_entry(net, net_exit_list, exit_list)
3848 ctnetlink_net_exit(net);
3850 /* wait for other cpus until they are done with ctnl_notifiers */
3854 static struct pernet_operations ctnetlink_net_ops = {
3855 .init = ctnetlink_net_init,
3856 .exit_batch = ctnetlink_net_exit_batch,
3859 static int __init ctnetlink_init(void)
3863 ret = nfnetlink_subsys_register(&ctnl_subsys);
3865 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3869 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3871 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3872 goto err_unreg_subsys;
3875 ret = register_pernet_subsys(&ctnetlink_net_ops);
3877 pr_err("ctnetlink_init: cannot register pernet operations\n");
3878 goto err_unreg_exp_subsys;
3880 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3881 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3882 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3886 err_unreg_exp_subsys:
3887 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3889 nfnetlink_subsys_unregister(&ctnl_subsys);
3894 static void __exit ctnetlink_exit(void)
3896 unregister_pernet_subsys(&ctnetlink_net_ops);
3897 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3898 nfnetlink_subsys_unregister(&ctnl_subsys);
3899 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3900 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3905 module_init(ctnetlink_init);
3906 module_exit(ctnetlink_exit);