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, const 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_u32 {
860 struct ctnetlink_filter {
863 u_int32_t orig_flags;
864 u_int32_t reply_flags;
866 struct nf_conntrack_tuple orig;
867 struct nf_conntrack_tuple reply;
868 struct nf_conntrack_zone zone;
870 struct ctnetlink_filter_u32 mark;
871 struct ctnetlink_filter_u32 status;
874 static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
875 [CTA_FILTER_ORIG_FLAGS] = { .type = NLA_U32 },
876 [CTA_FILTER_REPLY_FLAGS] = { .type = NLA_U32 },
879 static int ctnetlink_parse_filter(const struct nlattr *attr,
880 struct ctnetlink_filter *filter)
882 struct nlattr *tb[CTA_FILTER_MAX + 1];
885 ret = nla_parse_nested(tb, CTA_FILTER_MAX, attr, cta_filter_nla_policy,
890 if (tb[CTA_FILTER_ORIG_FLAGS]) {
891 filter->orig_flags = nla_get_u32(tb[CTA_FILTER_ORIG_FLAGS]);
892 if (filter->orig_flags & ~CTA_FILTER_F_ALL)
896 if (tb[CTA_FILTER_REPLY_FLAGS]) {
897 filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
898 if (filter->reply_flags & ~CTA_FILTER_F_ALL)
905 static int ctnetlink_parse_zone(const struct nlattr *attr,
906 struct nf_conntrack_zone *zone);
907 static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
908 struct nf_conntrack_tuple *tuple,
909 u32 type, u_int8_t l3num,
910 struct nf_conntrack_zone *zone,
913 static int ctnetlink_filter_parse_mark(struct ctnetlink_filter_u32 *mark,
914 const struct nlattr * const cda[])
916 #ifdef CONFIG_NF_CONNTRACK_MARK
918 mark->val = ntohl(nla_get_be32(cda[CTA_MARK]));
920 if (cda[CTA_MARK_MASK])
921 mark->mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
923 mark->mask = 0xffffffff;
924 } else if (cda[CTA_MARK_MASK]) {
931 static int ctnetlink_filter_parse_status(struct ctnetlink_filter_u32 *status,
932 const struct nlattr * const cda[])
934 if (cda[CTA_STATUS]) {
935 status->val = ntohl(nla_get_be32(cda[CTA_STATUS]));
936 if (cda[CTA_STATUS_MASK])
937 status->mask = ntohl(nla_get_be32(cda[CTA_STATUS_MASK]));
939 status->mask = status->val;
941 /* status->val == 0? always true, else always false. */
942 if (status->mask == 0)
944 } else if (cda[CTA_STATUS_MASK]) {
948 /* CTA_STATUS is NLA_U32, if this fires UAPI needs to be extended */
949 BUILD_BUG_ON(__IPS_MAX_BIT >= 32);
953 static struct ctnetlink_filter *
954 ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
956 struct ctnetlink_filter *filter;
959 #ifndef CONFIG_NF_CONNTRACK_MARK
960 if (cda[CTA_MARK] || cda[CTA_MARK_MASK])
961 return ERR_PTR(-EOPNOTSUPP);
964 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
966 return ERR_PTR(-ENOMEM);
968 filter->family = family;
970 err = ctnetlink_filter_parse_mark(&filter->mark, cda);
974 err = ctnetlink_filter_parse_status(&filter->status, cda);
978 if (!cda[CTA_FILTER])
981 err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
985 err = ctnetlink_parse_filter(cda[CTA_FILTER], filter);
989 if (filter->orig_flags) {
990 if (!cda[CTA_TUPLE_ORIG]) {
995 err = ctnetlink_parse_tuple_filter(cda, &filter->orig,
1004 if (filter->reply_flags) {
1005 if (!cda[CTA_TUPLE_REPLY]) {
1010 err = ctnetlink_parse_tuple_filter(cda, &filter->reply,
1014 filter->orig_flags);
1026 return ERR_PTR(err);
1029 static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
1031 return family || cda[CTA_MARK] || cda[CTA_FILTER] || cda[CTA_STATUS];
1034 static int ctnetlink_start(struct netlink_callback *cb)
1036 const struct nlattr * const *cda = cb->data;
1037 struct ctnetlink_filter *filter = NULL;
1038 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1039 u8 family = nfmsg->nfgen_family;
1041 if (ctnetlink_needs_filter(family, cda)) {
1042 filter = ctnetlink_alloc_filter(cda, family);
1044 return PTR_ERR(filter);
1051 static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
1052 struct nf_conntrack_tuple *ct_tuple,
1053 u_int32_t flags, int family)
1057 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1058 filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
1061 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1062 filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
1066 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1067 !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
1068 &ct_tuple->src.u3.in6))
1071 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1072 !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
1073 &ct_tuple->dst.u3.in6))
1078 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
1079 filter_tuple->dst.protonum != ct_tuple->dst.protonum)
1082 switch (ct_tuple->dst.protonum) {
1085 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
1086 filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
1089 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
1090 filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
1094 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
1095 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1097 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
1098 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1100 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
1101 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1104 case IPPROTO_ICMPV6:
1105 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
1106 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1108 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
1109 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1111 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
1112 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1120 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
1122 struct ctnetlink_filter *filter = data;
1123 struct nf_conntrack_tuple *tuple;
1129 /* Match entries of a given L3 protocol number.
1130 * If it is not specified, ie. l3proto == 0,
1131 * then match everything.
1133 if (filter->family && nf_ct_l3num(ct) != filter->family)
1136 if (filter->orig_flags) {
1137 tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
1138 if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
1144 if (filter->reply_flags) {
1145 tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
1146 if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
1147 filter->reply_flags,
1152 #ifdef CONFIG_NF_CONNTRACK_MARK
1153 if ((ct->mark & filter->mark.mask) != filter->mark.val)
1156 status = (u32)READ_ONCE(ct->status);
1157 if ((status & filter->status.mask) != filter->status.val)
1168 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1170 unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
1171 struct net *net = sock_net(skb->sk);
1172 struct nf_conn *ct, *last;
1173 struct nf_conntrack_tuple_hash *h;
1174 struct hlist_nulls_node *n;
1175 struct nf_conn *nf_ct_evict[8];
1179 last = (struct nf_conn *)cb->args[1];
1183 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
1187 if (nf_ct_should_gc(nf_ct_evict[i]))
1188 nf_ct_kill(nf_ct_evict[i]);
1189 nf_ct_put(nf_ct_evict[i]);
1192 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
1193 nf_conntrack_lock(lockp);
1194 if (cb->args[0] >= nf_conntrack_htable_size) {
1198 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
1200 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
1202 ct = nf_ct_tuplehash_to_ctrack(h);
1203 if (nf_ct_is_expired(ct)) {
1204 if (i < ARRAY_SIZE(nf_ct_evict) &&
1205 atomic_inc_not_zero(&ct->ct_general.use))
1206 nf_ct_evict[i++] = ct;
1210 if (!net_eq(net, nf_ct_net(ct)))
1218 if (!ctnetlink_filter_match(ct, cb->data))
1222 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1224 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1227 nf_conntrack_get(&ct->ct_general);
1228 cb->args[1] = (unsigned long)ct;
1242 /* nf ct hash resize happened, now clear the leftover. */
1243 if ((struct nf_conn *)cb->args[1] == last)
1251 if (nf_ct_should_gc(nf_ct_evict[i]))
1252 nf_ct_kill(nf_ct_evict[i]);
1253 nf_ct_put(nf_ct_evict[i]);
1259 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
1260 struct nf_conntrack_tuple *t,
1263 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1264 if (!tb[CTA_IP_V4_SRC])
1267 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1270 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1271 if (!tb[CTA_IP_V4_DST])
1274 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1280 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1281 struct nf_conntrack_tuple *t,
1284 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1285 if (!tb[CTA_IP_V6_SRC])
1288 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1291 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1292 if (!tb[CTA_IP_V6_DST])
1295 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1301 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1302 struct nf_conntrack_tuple *tuple,
1305 struct nlattr *tb[CTA_IP_MAX+1];
1308 ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
1312 ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
1313 cta_ip_nla_policy, NULL);
1317 switch (tuple->src.l3num) {
1319 ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
1322 ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
1329 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1330 [CTA_PROTO_NUM] = { .type = NLA_U8 },
1333 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1334 struct nf_conntrack_tuple *tuple,
1337 const struct nf_conntrack_l4proto *l4proto;
1338 struct nlattr *tb[CTA_PROTO_MAX+1];
1341 ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1342 proto_nla_policy, NULL);
1346 if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
1349 if (!tb[CTA_PROTO_NUM])
1352 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1355 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1357 if (likely(l4proto->nlattr_to_tuple)) {
1358 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1359 l4proto->nla_policy,
1362 ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
1371 ctnetlink_parse_zone(const struct nlattr *attr,
1372 struct nf_conntrack_zone *zone)
1374 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1375 NF_CT_DEFAULT_ZONE_DIR, 0);
1376 #ifdef CONFIG_NF_CONNTRACK_ZONES
1378 zone->id = ntohs(nla_get_be16(attr));
1387 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1388 struct nf_conntrack_zone *zone)
1392 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1395 ret = ctnetlink_parse_zone(attr, zone);
1399 if (type == CTA_TUPLE_REPLY)
1400 zone->dir = NF_CT_ZONE_DIR_REPL;
1402 zone->dir = NF_CT_ZONE_DIR_ORIG;
1407 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1408 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1409 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1410 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1413 #define CTA_FILTER_F_ALL_CTA_PROTO \
1414 (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
1415 CTA_FILTER_F_CTA_PROTO_DST_PORT | \
1416 CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
1417 CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
1418 CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
1419 CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
1420 CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
1421 CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
1424 ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
1425 struct nf_conntrack_tuple *tuple, u32 type,
1426 u_int8_t l3num, struct nf_conntrack_zone *zone,
1429 struct nlattr *tb[CTA_TUPLE_MAX+1];
1432 memset(tuple, 0, sizeof(*tuple));
1434 err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1435 tuple_nla_policy, NULL);
1439 if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1441 tuple->src.l3num = l3num;
1443 if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
1444 flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1445 if (!tb[CTA_TUPLE_IP])
1448 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
1453 if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
1454 if (!tb[CTA_TUPLE_PROTO])
1457 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
1460 } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
1461 /* Can't manage proto flags without a protonum */
1465 if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
1469 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1475 /* orig and expect tuples get DIR_ORIGINAL */
1476 if (type == CTA_TUPLE_REPLY)
1477 tuple->dst.dir = IP_CT_DIR_REPLY;
1479 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1485 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1486 struct nf_conntrack_tuple *tuple, u32 type,
1487 u_int8_t l3num, struct nf_conntrack_zone *zone)
1489 return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
1490 CTA_FILTER_FLAG(ALL));
1493 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1494 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1495 .len = NF_CT_HELPER_NAME_LEN - 1 },
1498 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1499 struct nlattr **helpinfo)
1502 struct nlattr *tb[CTA_HELP_MAX+1];
1504 err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1505 help_nla_policy, NULL);
1509 if (!tb[CTA_HELP_NAME])
1512 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1514 if (tb[CTA_HELP_INFO])
1515 *helpinfo = tb[CTA_HELP_INFO];
1520 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1521 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1522 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1523 [CTA_STATUS] = { .type = NLA_U32 },
1524 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1525 [CTA_HELP] = { .type = NLA_NESTED },
1526 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1527 [CTA_TIMEOUT] = { .type = NLA_U32 },
1528 [CTA_MARK] = { .type = NLA_U32 },
1529 [CTA_ID] = { .type = NLA_U32 },
1530 [CTA_NAT_DST] = { .type = NLA_NESTED },
1531 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1532 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1533 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1534 [CTA_ZONE] = { .type = NLA_U16 },
1535 [CTA_MARK_MASK] = { .type = NLA_U32 },
1536 [CTA_LABELS] = { .type = NLA_BINARY,
1537 .len = NF_CT_LABELS_MAX_SIZE },
1538 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1539 .len = NF_CT_LABELS_MAX_SIZE },
1540 [CTA_FILTER] = { .type = NLA_NESTED },
1541 [CTA_STATUS_MASK] = { .type = NLA_U32 },
1544 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1546 if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1549 return ctnetlink_filter_match(ct, data);
1552 static int ctnetlink_flush_conntrack(struct net *net,
1553 const struct nlattr * const cda[],
1554 u32 portid, int report, u8 family)
1556 struct ctnetlink_filter *filter = NULL;
1558 if (ctnetlink_needs_filter(family, cda)) {
1559 if (cda[CTA_FILTER])
1562 filter = ctnetlink_alloc_filter(cda, family);
1564 return PTR_ERR(filter);
1567 nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
1574 static int ctnetlink_del_conntrack(struct sk_buff *skb,
1575 const struct nfnl_info *info,
1576 const struct nlattr * const cda[])
1578 u8 family = info->nfmsg->nfgen_family;
1579 struct nf_conntrack_tuple_hash *h;
1580 struct nf_conntrack_tuple tuple;
1581 struct nf_conntrack_zone zone;
1585 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1589 if (cda[CTA_TUPLE_ORIG])
1590 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1592 else if (cda[CTA_TUPLE_REPLY])
1593 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1596 u_int8_t u3 = info->nfmsg->version ? family : AF_UNSPEC;
1598 return ctnetlink_flush_conntrack(info->net, cda,
1599 NETLINK_CB(skb).portid,
1600 nlmsg_report(info->nlh), u3);
1606 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1610 ct = nf_ct_tuplehash_to_ctrack(h);
1612 if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1618 __be32 id = nla_get_be32(cda[CTA_ID]);
1620 if (id != (__force __be32)nf_ct_get_id(ct)) {
1626 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(info->nlh));
1632 static int ctnetlink_get_conntrack(struct sk_buff *skb,
1633 const struct nfnl_info *info,
1634 const struct nlattr * const cda[])
1636 u_int8_t u3 = info->nfmsg->nfgen_family;
1637 struct nf_conntrack_tuple_hash *h;
1638 struct nf_conntrack_tuple tuple;
1639 struct nf_conntrack_zone zone;
1640 struct sk_buff *skb2;
1644 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1645 struct netlink_dump_control c = {
1646 .start = ctnetlink_start,
1647 .dump = ctnetlink_dump_table,
1648 .done = ctnetlink_done,
1649 .data = (void *)cda,
1652 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1655 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1659 if (cda[CTA_TUPLE_ORIG])
1660 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1662 else if (cda[CTA_TUPLE_REPLY])
1663 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1671 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1675 ct = nf_ct_tuplehash_to_ctrack(h);
1677 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1683 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid,
1684 info->nlh->nlmsg_seq,
1685 NFNL_MSG_TYPE(info->nlh->nlmsg_type), ct,
1693 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
1696 static int ctnetlink_done_list(struct netlink_callback *cb)
1699 nf_ct_put((struct nf_conn *)cb->args[1]);
1704 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1706 struct nf_conn *ct, *last;
1707 struct nf_conntrack_tuple_hash *h;
1708 struct hlist_nulls_node *n;
1709 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1710 u_int8_t l3proto = nfmsg->nfgen_family;
1713 struct hlist_nulls_head *list;
1714 struct net *net = sock_net(skb->sk);
1719 last = (struct nf_conn *)cb->args[1];
1721 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1722 struct ct_pcpu *pcpu;
1724 if (!cpu_possible(cpu))
1727 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1728 spin_lock_bh(&pcpu->lock);
1729 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1731 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1732 ct = nf_ct_tuplehash_to_ctrack(h);
1733 if (l3proto && nf_ct_l3num(ct) != l3proto)
1741 /* We can't dump extension info for the unconfirmed
1742 * list because unconfirmed conntracks can have
1743 * ct->ext reallocated (and thus freed).
1745 * In the dying list case ct->ext can't be free'd
1746 * until after we drop pcpu->lock.
1748 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1750 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1751 ct, dying ? true : false, 0);
1753 if (!atomic_inc_not_zero(&ct->ct_general.use))
1756 cb->args[1] = (unsigned long)ct;
1757 spin_unlock_bh(&pcpu->lock);
1765 spin_unlock_bh(&pcpu->lock);
1776 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1778 return ctnetlink_dump_list(skb, cb, true);
1781 static int ctnetlink_get_ct_dying(struct sk_buff *skb,
1782 const struct nfnl_info *info,
1783 const struct nlattr * const cda[])
1785 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1786 struct netlink_dump_control c = {
1787 .dump = ctnetlink_dump_dying,
1788 .done = ctnetlink_done_list,
1790 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1797 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1799 return ctnetlink_dump_list(skb, cb, false);
1802 static int ctnetlink_get_ct_unconfirmed(struct sk_buff *skb,
1803 const struct nfnl_info *info,
1804 const struct nlattr * const cda[])
1806 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1807 struct netlink_dump_control c = {
1808 .dump = ctnetlink_dump_unconfirmed,
1809 .done = ctnetlink_done_list,
1811 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1817 #if IS_ENABLED(CONFIG_NF_NAT)
1819 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1820 enum nf_nat_manip_type manip,
1821 const struct nlattr *attr)
1824 struct nf_nat_hook *nat_hook;
1827 nat_hook = rcu_dereference(nf_nat_hook);
1829 #ifdef CONFIG_MODULES
1831 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1832 if (request_module("nf-nat") < 0) {
1833 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1837 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1839 nat_hook = rcu_dereference(nf_nat_hook);
1846 err = nat_hook->parse_nat_setup(ct, manip, attr);
1847 if (err == -EAGAIN) {
1848 #ifdef CONFIG_MODULES
1850 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1851 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1852 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1856 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1867 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1872 /* Ignore these unchangable bits */
1873 on &= ~IPS_UNCHANGEABLE_MASK;
1874 off &= ~IPS_UNCHANGEABLE_MASK;
1876 for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1877 if (on & (1 << bit))
1878 set_bit(bit, &ct->status);
1879 else if (off & (1 << bit))
1880 clear_bit(bit, &ct->status);
1885 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1888 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1889 d = ct->status ^ status;
1891 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1895 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1896 /* SEEN_REPLY bit can only be set */
1899 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1900 /* ASSURED bit can only be set */
1903 __ctnetlink_change_status(ct, status, 0);
1908 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1910 #if IS_ENABLED(CONFIG_NF_NAT)
1913 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1916 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1921 return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1924 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1930 static int ctnetlink_change_helper(struct nf_conn *ct,
1931 const struct nlattr * const cda[])
1933 struct nf_conntrack_helper *helper;
1934 struct nf_conn_help *help = nfct_help(ct);
1935 char *helpname = NULL;
1936 struct nlattr *helpinfo = NULL;
1939 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1943 /* don't change helper of sibling connections */
1945 /* If we try to change the helper to the same thing twice,
1946 * treat the second attempt as a no-op instead of returning
1952 helper = rcu_dereference(help->helper);
1953 if (helper && !strcmp(helper->name, helpname))
1961 if (!strcmp(helpname, "")) {
1962 if (help && help->helper) {
1963 /* we had a helper before ... */
1964 nf_ct_remove_expectations(ct);
1965 RCU_INIT_POINTER(help->helper, NULL);
1972 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1973 nf_ct_protonum(ct));
1974 if (helper == NULL) {
1980 if (help->helper == helper) {
1981 /* update private helper data if allowed. */
1982 if (helper->from_nlattr)
1983 helper->from_nlattr(helpinfo, ct);
1988 /* we cannot set a helper for an existing conntrack */
1996 static int ctnetlink_change_timeout(struct nf_conn *ct,
1997 const struct nlattr * const cda[])
1999 u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2001 if (timeout > INT_MAX)
2003 ct->timeout = nfct_time_stamp + (u32)timeout;
2005 if (test_bit(IPS_DYING_BIT, &ct->status))
2011 #if defined(CONFIG_NF_CONNTRACK_MARK)
2012 static void ctnetlink_change_mark(struct nf_conn *ct,
2013 const struct nlattr * const cda[])
2015 u32 mark, newmark, mask = 0;
2017 if (cda[CTA_MARK_MASK])
2018 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2020 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2021 newmark = (ct->mark & mask) ^ mark;
2022 if (newmark != ct->mark)
2027 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
2028 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
2029 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
2030 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
2033 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
2034 const struct nlattr * const cda[])
2036 const struct nlattr *attr = cda[CTA_PROTOINFO];
2037 const struct nf_conntrack_l4proto *l4proto;
2038 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
2041 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
2042 protoinfo_policy, NULL);
2046 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
2047 if (l4proto->from_nlattr)
2048 err = l4proto->from_nlattr(tb, ct);
2053 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
2054 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
2055 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
2056 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
2059 static int change_seq_adj(struct nf_ct_seqadj *seq,
2060 const struct nlattr * const attr)
2063 struct nlattr *cda[CTA_SEQADJ_MAX+1];
2065 err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
2066 seqadj_policy, NULL);
2070 if (!cda[CTA_SEQADJ_CORRECTION_POS])
2073 seq->correction_pos =
2074 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
2076 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
2079 seq->offset_before =
2080 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
2082 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
2086 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
2092 ctnetlink_change_seq_adj(struct nf_conn *ct,
2093 const struct nlattr * const cda[])
2095 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
2101 spin_lock_bh(&ct->lock);
2102 if (cda[CTA_SEQ_ADJ_ORIG]) {
2103 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
2104 cda[CTA_SEQ_ADJ_ORIG]);
2108 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2111 if (cda[CTA_SEQ_ADJ_REPLY]) {
2112 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
2113 cda[CTA_SEQ_ADJ_REPLY]);
2117 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2120 spin_unlock_bh(&ct->lock);
2123 spin_unlock_bh(&ct->lock);
2127 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
2128 [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
2129 [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
2130 [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
2133 static int ctnetlink_change_synproxy(struct nf_conn *ct,
2134 const struct nlattr * const cda[])
2136 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
2137 struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
2143 err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
2144 cda[CTA_SYNPROXY], synproxy_policy,
2149 if (!tb[CTA_SYNPROXY_ISN] ||
2150 !tb[CTA_SYNPROXY_ITS] ||
2151 !tb[CTA_SYNPROXY_TSOFF])
2154 synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
2155 synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
2156 synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
2162 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
2164 #ifdef CONFIG_NF_CONNTRACK_LABELS
2165 size_t len = nla_len(cda[CTA_LABELS]);
2166 const void *mask = cda[CTA_LABELS_MASK];
2168 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
2172 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
2173 nla_len(cda[CTA_LABELS_MASK]) != len)
2175 mask = nla_data(cda[CTA_LABELS_MASK]);
2180 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
2187 ctnetlink_change_conntrack(struct nf_conn *ct,
2188 const struct nlattr * const cda[])
2192 /* only allow NAT changes and master assignation for new conntracks */
2193 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
2196 if (cda[CTA_HELP]) {
2197 err = ctnetlink_change_helper(ct, cda);
2202 if (cda[CTA_TIMEOUT]) {
2203 err = ctnetlink_change_timeout(ct, cda);
2208 if (cda[CTA_STATUS]) {
2209 err = ctnetlink_change_status(ct, cda);
2214 if (cda[CTA_PROTOINFO]) {
2215 err = ctnetlink_change_protoinfo(ct, cda);
2220 #if defined(CONFIG_NF_CONNTRACK_MARK)
2222 ctnetlink_change_mark(ct, cda);
2225 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2226 err = ctnetlink_change_seq_adj(ct, cda);
2231 if (cda[CTA_SYNPROXY]) {
2232 err = ctnetlink_change_synproxy(ct, cda);
2237 if (cda[CTA_LABELS]) {
2238 err = ctnetlink_attach_labels(ct, cda);
2246 static struct nf_conn *
2247 ctnetlink_create_conntrack(struct net *net,
2248 const struct nf_conntrack_zone *zone,
2249 const struct nlattr * const cda[],
2250 struct nf_conntrack_tuple *otuple,
2251 struct nf_conntrack_tuple *rtuple,
2256 struct nf_conntrack_helper *helper;
2257 struct nf_conn_tstamp *tstamp;
2260 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
2262 return ERR_PTR(-ENOMEM);
2264 if (!cda[CTA_TIMEOUT])
2267 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2268 if (timeout > INT_MAX)
2270 ct->timeout = (u32)timeout + nfct_time_stamp;
2273 if (cda[CTA_HELP]) {
2274 char *helpname = NULL;
2275 struct nlattr *helpinfo = NULL;
2277 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
2281 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2282 nf_ct_protonum(ct));
2283 if (helper == NULL) {
2285 #ifdef CONFIG_MODULES
2286 if (request_module("nfct-helper-%s", helpname) < 0) {
2292 helper = __nf_conntrack_helper_find(helpname,
2294 nf_ct_protonum(ct));
2304 struct nf_conn_help *help;
2306 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2311 /* set private helper data if allowed. */
2312 if (helper->from_nlattr)
2313 helper->from_nlattr(helpinfo, ct);
2315 /* not in hash table yet so not strictly necessary */
2316 RCU_INIT_POINTER(help->helper, helper);
2319 /* try an implicit helper assignation */
2320 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
2325 err = ctnetlink_setup_nat(ct, cda);
2329 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2330 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2331 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2332 nf_ct_labels_ext_add(ct);
2333 nfct_seqadj_ext_add(ct);
2334 nfct_synproxy_ext_add(ct);
2336 /* we must add conntrack extensions before confirmation. */
2337 ct->status |= IPS_CONFIRMED;
2339 if (cda[CTA_STATUS]) {
2340 err = ctnetlink_change_status(ct, cda);
2345 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2346 err = ctnetlink_change_seq_adj(ct, cda);
2351 memset(&ct->proto, 0, sizeof(ct->proto));
2352 if (cda[CTA_PROTOINFO]) {
2353 err = ctnetlink_change_protoinfo(ct, cda);
2358 if (cda[CTA_SYNPROXY]) {
2359 err = ctnetlink_change_synproxy(ct, cda);
2364 #if defined(CONFIG_NF_CONNTRACK_MARK)
2366 ctnetlink_change_mark(ct, cda);
2369 /* setup master conntrack: this is a confirmed expectation */
2370 if (cda[CTA_TUPLE_MASTER]) {
2371 struct nf_conntrack_tuple master;
2372 struct nf_conntrack_tuple_hash *master_h;
2373 struct nf_conn *master_ct;
2375 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2380 master_h = nf_conntrack_find_get(net, zone, &master);
2381 if (master_h == NULL) {
2385 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2386 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2387 ct->master = master_ct;
2389 tstamp = nf_conn_tstamp_find(ct);
2391 tstamp->start = ktime_get_real_ns();
2393 err = nf_conntrack_hash_check_insert(ct);
2404 nf_conntrack_free(ct);
2405 return ERR_PTR(err);
2408 static int ctnetlink_new_conntrack(struct sk_buff *skb,
2409 const struct nfnl_info *info,
2410 const struct nlattr * const cda[])
2412 struct nf_conntrack_tuple otuple, rtuple;
2413 struct nf_conntrack_tuple_hash *h = NULL;
2414 u_int8_t u3 = info->nfmsg->nfgen_family;
2415 struct nf_conntrack_zone zone;
2419 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2423 if (cda[CTA_TUPLE_ORIG]) {
2424 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2430 if (cda[CTA_TUPLE_REPLY]) {
2431 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2437 if (cda[CTA_TUPLE_ORIG])
2438 h = nf_conntrack_find_get(info->net, &zone, &otuple);
2439 else if (cda[CTA_TUPLE_REPLY])
2440 h = nf_conntrack_find_get(info->net, &zone, &rtuple);
2444 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
2445 enum ip_conntrack_events events;
2447 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2449 if (otuple.dst.protonum != rtuple.dst.protonum)
2452 ct = ctnetlink_create_conntrack(info->net, &zone, cda,
2453 &otuple, &rtuple, u3);
2458 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2459 events = 1 << IPCT_RELATED;
2461 events = 1 << IPCT_NEW;
2463 if (cda[CTA_LABELS] &&
2464 ctnetlink_attach_labels(ct, cda) == 0)
2465 events |= (1 << IPCT_LABEL);
2467 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2468 (1 << IPCT_ASSURED) |
2469 (1 << IPCT_HELPER) |
2470 (1 << IPCT_PROTOINFO) |
2471 (1 << IPCT_SEQADJ) |
2473 (1 << IPCT_SYNPROXY) |
2475 ct, NETLINK_CB(skb).portid,
2476 nlmsg_report(info->nlh));
2482 /* implicit 'else' */
2485 ct = nf_ct_tuplehash_to_ctrack(h);
2486 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL)) {
2487 err = ctnetlink_change_conntrack(ct, cda);
2489 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2490 (1 << IPCT_ASSURED) |
2491 (1 << IPCT_HELPER) |
2493 (1 << IPCT_PROTOINFO) |
2494 (1 << IPCT_SEQADJ) |
2496 (1 << IPCT_SYNPROXY),
2497 ct, NETLINK_CB(skb).portid,
2498 nlmsg_report(info->nlh));
2507 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2508 __u16 cpu, const struct ip_conntrack_stat *st)
2510 struct nlmsghdr *nlh;
2511 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2513 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2514 IPCTNL_MSG_CT_GET_STATS_CPU);
2515 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2516 NFNETLINK_V0, htons(cpu));
2520 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2521 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2522 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2523 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2524 htonl(st->insert_failed)) ||
2525 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2526 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2527 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2528 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2529 htonl(st->search_restart)) ||
2530 nla_put_be32(skb, CTA_STATS_CLASH_RESOLVE,
2531 htonl(st->clash_resolve)))
2532 goto nla_put_failure;
2534 nlmsg_end(skb, nlh);
2539 nlmsg_cancel(skb, nlh);
2544 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2547 struct net *net = sock_net(skb->sk);
2549 if (cb->args[0] == nr_cpu_ids)
2552 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2553 const struct ip_conntrack_stat *st;
2555 if (!cpu_possible(cpu))
2558 st = per_cpu_ptr(net->ct.stat, cpu);
2559 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2560 NETLINK_CB(cb->skb).portid,
2570 static int ctnetlink_stat_ct_cpu(struct sk_buff *skb,
2571 const struct nfnl_info *info,
2572 const struct nlattr * const cda[])
2574 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
2575 struct netlink_dump_control c = {
2576 .dump = ctnetlink_ct_stat_cpu_dump,
2578 return netlink_dump_start(info->sk, skb, info->nlh, &c);
2585 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2588 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2589 unsigned int nr_conntracks;
2590 struct nlmsghdr *nlh;
2592 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2593 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2598 nr_conntracks = nf_conntrack_count(net);
2599 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2600 goto nla_put_failure;
2602 if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2603 goto nla_put_failure;
2605 nlmsg_end(skb, nlh);
2610 nlmsg_cancel(skb, nlh);
2614 static int ctnetlink_stat_ct(struct sk_buff *skb, const struct nfnl_info *info,
2615 const struct nlattr * const cda[])
2617 struct sk_buff *skb2;
2620 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2624 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2625 info->nlh->nlmsg_seq,
2626 NFNL_MSG_TYPE(info->nlh->nlmsg_type),
2633 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
2636 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2637 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2638 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2639 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2640 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2641 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2642 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2643 .len = NF_CT_HELPER_NAME_LEN - 1 },
2644 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2645 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2646 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2647 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2648 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2651 static struct nf_conntrack_expect *
2652 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2653 struct nf_conntrack_helper *helper,
2654 struct nf_conntrack_tuple *tuple,
2655 struct nf_conntrack_tuple *mask);
2657 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2659 ctnetlink_glue_build_size(const struct nf_conn *ct)
2661 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2662 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2663 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2664 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2665 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2666 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2667 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2668 + nla_total_size(0) /* CTA_PROTOINFO */
2669 + nla_total_size(0) /* CTA_HELP */
2670 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2671 + ctnetlink_secctx_size(ct)
2672 + ctnetlink_acct_size(ct)
2673 + ctnetlink_timestamp_size(ct)
2674 #if IS_ENABLED(CONFIG_NF_NAT)
2675 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2676 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2678 #ifdef CONFIG_NF_CONNTRACK_MARK
2679 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2681 #ifdef CONFIG_NF_CONNTRACK_ZONES
2682 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2684 + ctnetlink_proto_size(ct)
2688 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2690 const struct nf_conntrack_zone *zone;
2691 struct nlattr *nest_parms;
2693 zone = nf_ct_zone(ct);
2695 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2697 goto nla_put_failure;
2698 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2699 goto nla_put_failure;
2700 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2701 NF_CT_ZONE_DIR_ORIG) < 0)
2702 goto nla_put_failure;
2703 nla_nest_end(skb, nest_parms);
2705 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2707 goto nla_put_failure;
2708 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2709 goto nla_put_failure;
2710 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2711 NF_CT_ZONE_DIR_REPL) < 0)
2712 goto nla_put_failure;
2713 nla_nest_end(skb, nest_parms);
2715 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2716 NF_CT_DEFAULT_ZONE_DIR) < 0)
2717 goto nla_put_failure;
2719 if (ctnetlink_dump_id(skb, ct) < 0)
2720 goto nla_put_failure;
2722 if (ctnetlink_dump_status(skb, ct) < 0)
2723 goto nla_put_failure;
2725 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
2726 goto nla_put_failure;
2728 if (ctnetlink_dump_protoinfo(skb, ct, false) < 0)
2729 goto nla_put_failure;
2731 if (ctnetlink_dump_acct(skb, ct, IPCTNL_MSG_CT_GET) < 0 ||
2732 ctnetlink_dump_timestamp(skb, ct) < 0)
2733 goto nla_put_failure;
2735 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2736 goto nla_put_failure;
2738 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2739 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2740 goto nla_put_failure;
2742 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2743 goto nla_put_failure;
2745 if ((ct->status & IPS_SEQ_ADJUST) &&
2746 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2747 goto nla_put_failure;
2749 if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2750 goto nla_put_failure;
2752 #ifdef CONFIG_NF_CONNTRACK_MARK
2753 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2754 goto nla_put_failure;
2756 if (ctnetlink_dump_labels(skb, ct) < 0)
2757 goto nla_put_failure;
2765 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2766 enum ip_conntrack_info ctinfo,
2767 u_int16_t ct_attr, u_int16_t ct_info_attr)
2769 struct nlattr *nest_parms;
2771 nest_parms = nla_nest_start(skb, ct_attr);
2773 goto nla_put_failure;
2775 if (__ctnetlink_glue_build(skb, ct) < 0)
2776 goto nla_put_failure;
2778 nla_nest_end(skb, nest_parms);
2780 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2781 goto nla_put_failure;
2790 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2792 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2793 unsigned long d = ct->status ^ status;
2795 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2796 /* SEEN_REPLY bit can only be set */
2799 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2800 /* ASSURED bit can only be set */
2803 /* This check is less strict than ctnetlink_change_status()
2804 * because callers often flip IPS_EXPECTED bits when sending
2805 * an NFQA_CT attribute to the kernel. So ignore the
2806 * unchangeable bits but do not error out. Also user programs
2807 * are allowed to clear the bits that they are allowed to change.
2809 __ctnetlink_change_status(ct, status, ~status);
2814 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2818 if (cda[CTA_TIMEOUT]) {
2819 err = ctnetlink_change_timeout(ct, cda);
2823 if (cda[CTA_STATUS]) {
2824 err = ctnetlink_update_status(ct, cda);
2828 if (cda[CTA_HELP]) {
2829 err = ctnetlink_change_helper(ct, cda);
2833 if (cda[CTA_LABELS]) {
2834 err = ctnetlink_attach_labels(ct, cda);
2838 #if defined(CONFIG_NF_CONNTRACK_MARK)
2839 if (cda[CTA_MARK]) {
2840 ctnetlink_change_mark(ct, cda);
2847 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2849 struct nlattr *cda[CTA_MAX+1];
2852 ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2857 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2860 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2861 const struct nf_conn *ct,
2862 struct nf_conntrack_tuple *tuple,
2863 struct nf_conntrack_tuple *mask)
2867 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2868 nf_ct_l3num(ct), NULL);
2872 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2873 nf_ct_l3num(ct), NULL);
2877 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2878 u32 portid, u32 report)
2880 struct nlattr *cda[CTA_EXPECT_MAX+1];
2881 struct nf_conntrack_tuple tuple, mask;
2882 struct nf_conntrack_helper *helper = NULL;
2883 struct nf_conntrack_expect *exp;
2886 err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2887 exp_nla_policy, NULL);
2891 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2896 if (cda[CTA_EXPECT_HELP_NAME]) {
2897 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2899 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2900 nf_ct_protonum(ct));
2905 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2906 helper, &tuple, &mask);
2908 return PTR_ERR(exp);
2910 err = nf_ct_expect_related_report(exp, portid, report, 0);
2911 nf_ct_expect_put(exp);
2915 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2916 enum ip_conntrack_info ctinfo, int diff)
2918 if (!(ct->status & IPS_NAT_MASK))
2921 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2924 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2925 .build_size = ctnetlink_glue_build_size,
2926 .build = ctnetlink_glue_build,
2927 .parse = ctnetlink_glue_parse,
2928 .attach_expect = ctnetlink_glue_attach_expect,
2929 .seq_adjust = ctnetlink_glue_seqadj,
2931 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2933 /***********************************************************************
2935 ***********************************************************************/
2937 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2938 const struct nf_conntrack_tuple *tuple,
2941 struct nlattr *nest_parms;
2943 nest_parms = nla_nest_start(skb, type);
2945 goto nla_put_failure;
2946 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2947 goto nla_put_failure;
2948 nla_nest_end(skb, nest_parms);
2956 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2957 const struct nf_conntrack_tuple *tuple,
2958 const struct nf_conntrack_tuple_mask *mask)
2960 const struct nf_conntrack_l4proto *l4proto;
2961 struct nf_conntrack_tuple m;
2962 struct nlattr *nest_parms;
2965 memset(&m, 0xFF, sizeof(m));
2966 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2967 m.src.u.all = mask->src.u.all;
2968 m.src.l3num = tuple->src.l3num;
2969 m.dst.protonum = tuple->dst.protonum;
2971 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2973 goto nla_put_failure;
2976 ret = ctnetlink_dump_tuples_ip(skb, &m);
2978 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2979 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2983 if (unlikely(ret < 0))
2984 goto nla_put_failure;
2986 nla_nest_end(skb, nest_parms);
2994 static const union nf_inet_addr any_addr;
2996 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2998 static __read_mostly siphash_key_t exp_id_seed;
2999 unsigned long a, b, c, d;
3001 net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
3003 a = (unsigned long)exp;
3004 b = (unsigned long)exp->helper;
3005 c = (unsigned long)exp->master;
3006 d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
3009 return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
3011 return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
3016 ctnetlink_exp_dump_expect(struct sk_buff *skb,
3017 const struct nf_conntrack_expect *exp)
3019 struct nf_conn *master = exp->master;
3020 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
3021 struct nf_conn_help *help;
3022 #if IS_ENABLED(CONFIG_NF_NAT)
3023 struct nlattr *nest_parms;
3024 struct nf_conntrack_tuple nat_tuple = {};
3026 struct nf_ct_helper_expectfn *expfn;
3031 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
3032 goto nla_put_failure;
3033 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
3034 goto nla_put_failure;
3035 if (ctnetlink_exp_dump_tuple(skb,
3036 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
3037 CTA_EXPECT_MASTER) < 0)
3038 goto nla_put_failure;
3040 #if IS_ENABLED(CONFIG_NF_NAT)
3041 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
3042 exp->saved_proto.all) {
3043 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
3045 goto nla_put_failure;
3047 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
3048 goto nla_put_failure;
3050 nat_tuple.src.l3num = nf_ct_l3num(master);
3051 nat_tuple.src.u3 = exp->saved_addr;
3052 nat_tuple.dst.protonum = nf_ct_protonum(master);
3053 nat_tuple.src.u = exp->saved_proto;
3055 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
3056 CTA_EXPECT_NAT_TUPLE) < 0)
3057 goto nla_put_failure;
3058 nla_nest_end(skb, nest_parms);
3061 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
3062 nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
3063 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
3064 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
3065 goto nla_put_failure;
3066 help = nfct_help(master);
3068 struct nf_conntrack_helper *helper;
3070 helper = rcu_dereference(help->helper);
3072 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
3073 goto nla_put_failure;
3075 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
3076 if (expfn != NULL &&
3077 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
3078 goto nla_put_failure;
3087 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
3088 int event, const struct nf_conntrack_expect *exp)
3090 struct nlmsghdr *nlh;
3091 unsigned int flags = portid ? NLM_F_MULTI : 0;
3093 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
3094 nlh = nfnl_msg_put(skb, portid, seq, event, flags,
3095 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3099 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3100 goto nla_put_failure;
3102 nlmsg_end(skb, nlh);
3107 nlmsg_cancel(skb, nlh);
3111 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3113 ctnetlink_expect_event(unsigned int events, const struct nf_exp_event *item)
3115 struct nf_conntrack_expect *exp = item->exp;
3116 struct net *net = nf_ct_exp_net(exp);
3117 struct nlmsghdr *nlh;
3118 struct sk_buff *skb;
3119 unsigned int type, group;
3122 if (events & (1 << IPEXP_DESTROY)) {
3123 type = IPCTNL_MSG_EXP_DELETE;
3124 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
3125 } else if (events & (1 << IPEXP_NEW)) {
3126 type = IPCTNL_MSG_EXP_NEW;
3127 flags = NLM_F_CREATE|NLM_F_EXCL;
3128 group = NFNLGRP_CONNTRACK_EXP_NEW;
3132 if (!item->report && !nfnetlink_has_listeners(net, group))
3135 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
3139 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
3140 nlh = nfnl_msg_put(skb, item->portid, 0, type, flags,
3141 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3145 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3146 goto nla_put_failure;
3148 nlmsg_end(skb, nlh);
3149 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
3153 nlmsg_cancel(skb, nlh);
3157 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
3161 static int ctnetlink_exp_done(struct netlink_callback *cb)
3164 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
3169 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3171 struct net *net = sock_net(skb->sk);
3172 struct nf_conntrack_expect *exp, *last;
3173 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3174 u_int8_t l3proto = nfmsg->nfgen_family;
3177 last = (struct nf_conntrack_expect *)cb->args[1];
3178 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
3180 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
3182 if (l3proto && exp->tuple.src.l3num != l3proto)
3185 if (!net_eq(nf_ct_net(exp->master), net))
3193 if (ctnetlink_exp_fill_info(skb,
3194 NETLINK_CB(cb->skb).portid,
3198 if (!refcount_inc_not_zero(&exp->use))
3200 cb->args[1] = (unsigned long)exp;
3212 nf_ct_expect_put(last);
3218 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3220 struct nf_conntrack_expect *exp, *last;
3221 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3222 struct nf_conn *ct = cb->data;
3223 struct nf_conn_help *help = nfct_help(ct);
3224 u_int8_t l3proto = nfmsg->nfgen_family;
3230 last = (struct nf_conntrack_expect *)cb->args[1];
3232 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
3233 if (l3proto && exp->tuple.src.l3num != l3proto)
3240 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
3244 if (!refcount_inc_not_zero(&exp->use))
3246 cb->args[1] = (unsigned long)exp;
3258 nf_ct_expect_put(last);
3263 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
3264 struct sk_buff *skb,
3265 const struct nlmsghdr *nlh,
3266 const struct nlattr * const cda[],
3267 struct netlink_ext_ack *extack)
3270 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3271 u_int8_t u3 = nfmsg->nfgen_family;
3272 struct nf_conntrack_tuple tuple;
3273 struct nf_conntrack_tuple_hash *h;
3275 struct nf_conntrack_zone zone;
3276 struct netlink_dump_control c = {
3277 .dump = ctnetlink_exp_ct_dump_table,
3278 .done = ctnetlink_exp_done,
3281 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3286 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3290 h = nf_conntrack_find_get(net, &zone, &tuple);
3294 ct = nf_ct_tuplehash_to_ctrack(h);
3295 /* No expectation linked to this connection tracking. */
3296 if (!nfct_help(ct)) {
3303 err = netlink_dump_start(ctnl, skb, nlh, &c);
3309 static int ctnetlink_get_expect(struct sk_buff *skb,
3310 const struct nfnl_info *info,
3311 const struct nlattr * const cda[])
3313 u_int8_t u3 = info->nfmsg->nfgen_family;
3314 struct nf_conntrack_tuple tuple;
3315 struct nf_conntrack_expect *exp;
3316 struct nf_conntrack_zone zone;
3317 struct sk_buff *skb2;
3320 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3321 if (cda[CTA_EXPECT_MASTER])
3322 return ctnetlink_dump_exp_ct(info->net, info->sk, skb,
3326 struct netlink_dump_control c = {
3327 .dump = ctnetlink_exp_dump_table,
3328 .done = ctnetlink_exp_done,
3330 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3334 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3338 if (cda[CTA_EXPECT_TUPLE])
3339 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3341 else if (cda[CTA_EXPECT_MASTER])
3342 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3350 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3354 if (cda[CTA_EXPECT_ID]) {
3355 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3357 if (id != nf_expect_get_id(exp)) {
3358 nf_ct_expect_put(exp);
3363 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3365 nf_ct_expect_put(exp);
3370 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3371 info->nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
3374 nf_ct_expect_put(exp);
3380 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
3383 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3385 const struct nf_conn_help *m_help;
3386 const char *name = data;
3388 m_help = nfct_help(exp->master);
3390 return strcmp(m_help->helper->name, name) == 0;
3393 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3398 static int ctnetlink_del_expect(struct sk_buff *skb,
3399 const struct nfnl_info *info,
3400 const struct nlattr * const cda[])
3402 u_int8_t u3 = info->nfmsg->nfgen_family;
3403 struct nf_conntrack_expect *exp;
3404 struct nf_conntrack_tuple tuple;
3405 struct nf_conntrack_zone zone;
3408 if (cda[CTA_EXPECT_TUPLE]) {
3409 /* delete a single expect by tuple */
3410 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3414 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3419 /* bump usage count to 2 */
3420 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3424 if (cda[CTA_EXPECT_ID]) {
3425 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3426 if (ntohl(id) != (u32)(unsigned long)exp) {
3427 nf_ct_expect_put(exp);
3432 /* after list removal, usage count == 1 */
3433 spin_lock_bh(&nf_conntrack_expect_lock);
3434 if (del_timer(&exp->timeout)) {
3435 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3436 nlmsg_report(info->nlh));
3437 nf_ct_expect_put(exp);
3439 spin_unlock_bh(&nf_conntrack_expect_lock);
3440 /* have to put what we 'get' above.
3441 * after this line usage count == 0 */
3442 nf_ct_expect_put(exp);
3443 } else if (cda[CTA_EXPECT_HELP_NAME]) {
3444 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3446 nf_ct_expect_iterate_net(info->net, expect_iter_name, name,
3447 NETLINK_CB(skb).portid,
3448 nlmsg_report(info->nlh));
3450 /* This basically means we have to flush everything*/
3451 nf_ct_expect_iterate_net(info->net, expect_iter_all, NULL,
3452 NETLINK_CB(skb).portid,
3453 nlmsg_report(info->nlh));
3459 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3460 const struct nlattr * const cda[])
3462 if (cda[CTA_EXPECT_TIMEOUT]) {
3463 if (!del_timer(&x->timeout))
3466 x->timeout.expires = jiffies +
3467 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3468 add_timer(&x->timeout);
3473 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3474 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3475 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3479 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3480 struct nf_conntrack_expect *exp,
3483 #if IS_ENABLED(CONFIG_NF_NAT)
3484 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3485 struct nf_conntrack_tuple nat_tuple = {};
3488 err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3489 exp_nat_nla_policy, NULL);
3493 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3496 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3497 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3502 exp->saved_addr = nat_tuple.src.u3;
3503 exp->saved_proto = nat_tuple.src.u;
3504 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3512 static struct nf_conntrack_expect *
3513 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3514 struct nf_conntrack_helper *helper,
3515 struct nf_conntrack_tuple *tuple,
3516 struct nf_conntrack_tuple *mask)
3518 u_int32_t class = 0;
3519 struct nf_conntrack_expect *exp;
3520 struct nf_conn_help *help;
3523 help = nfct_help(ct);
3525 return ERR_PTR(-EOPNOTSUPP);
3527 if (cda[CTA_EXPECT_CLASS] && helper) {
3528 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3529 if (class > helper->expect_class_max)
3530 return ERR_PTR(-EINVAL);
3532 exp = nf_ct_expect_alloc(ct);
3534 return ERR_PTR(-ENOMEM);
3536 if (cda[CTA_EXPECT_FLAGS]) {
3537 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3538 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3542 if (cda[CTA_EXPECT_FN]) {
3543 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3544 struct nf_ct_helper_expectfn *expfn;
3546 expfn = nf_ct_helper_expectfn_find_by_name(name);
3547 if (expfn == NULL) {
3551 exp->expectfn = expfn->expectfn;
3553 exp->expectfn = NULL;
3557 exp->helper = helper;
3558 exp->tuple = *tuple;
3559 exp->mask.src.u3 = mask->src.u3;
3560 exp->mask.src.u.all = mask->src.u.all;
3562 if (cda[CTA_EXPECT_NAT]) {
3563 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3564 exp, nf_ct_l3num(ct));
3570 nf_ct_expect_put(exp);
3571 return ERR_PTR(err);
3575 ctnetlink_create_expect(struct net *net,
3576 const struct nf_conntrack_zone *zone,
3577 const struct nlattr * const cda[],
3578 u_int8_t u3, u32 portid, int report)
3580 struct nf_conntrack_tuple tuple, mask, master_tuple;
3581 struct nf_conntrack_tuple_hash *h = NULL;
3582 struct nf_conntrack_helper *helper = NULL;
3583 struct nf_conntrack_expect *exp;
3587 /* caller guarantees that those three CTA_EXPECT_* exist */
3588 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3592 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3596 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3601 /* Look for master conntrack of this expectation */
3602 h = nf_conntrack_find_get(net, zone, &master_tuple);
3605 ct = nf_ct_tuplehash_to_ctrack(h);
3608 if (cda[CTA_EXPECT_HELP_NAME]) {
3609 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3611 helper = __nf_conntrack_helper_find(helpname, u3,
3612 nf_ct_protonum(ct));
3613 if (helper == NULL) {
3615 #ifdef CONFIG_MODULES
3616 if (request_module("nfct-helper-%s", helpname) < 0) {
3621 helper = __nf_conntrack_helper_find(helpname, u3,
3622 nf_ct_protonum(ct));
3634 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3640 err = nf_ct_expect_related_report(exp, portid, report, 0);
3641 nf_ct_expect_put(exp);
3649 static int ctnetlink_new_expect(struct sk_buff *skb,
3650 const struct nfnl_info *info,
3651 const struct nlattr * const cda[])
3653 u_int8_t u3 = info->nfmsg->nfgen_family;
3654 struct nf_conntrack_tuple tuple;
3655 struct nf_conntrack_expect *exp;
3656 struct nf_conntrack_zone zone;
3659 if (!cda[CTA_EXPECT_TUPLE]
3660 || !cda[CTA_EXPECT_MASK]
3661 || !cda[CTA_EXPECT_MASTER])
3664 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3668 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3673 spin_lock_bh(&nf_conntrack_expect_lock);
3674 exp = __nf_ct_expect_find(info->net, &zone, &tuple);
3676 spin_unlock_bh(&nf_conntrack_expect_lock);
3678 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
3679 err = ctnetlink_create_expect(info->net, &zone, cda, u3,
3680 NETLINK_CB(skb).portid,
3681 nlmsg_report(info->nlh));
3687 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL))
3688 err = ctnetlink_change_expect(exp, cda);
3689 spin_unlock_bh(&nf_conntrack_expect_lock);
3695 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3696 const struct ip_conntrack_stat *st)
3698 struct nlmsghdr *nlh;
3699 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3701 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3702 IPCTNL_MSG_EXP_GET_STATS_CPU);
3703 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
3704 NFNETLINK_V0, htons(cpu));
3708 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3709 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3710 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3711 goto nla_put_failure;
3713 nlmsg_end(skb, nlh);
3718 nlmsg_cancel(skb, nlh);
3723 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3726 struct net *net = sock_net(skb->sk);
3728 if (cb->args[0] == nr_cpu_ids)
3731 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3732 const struct ip_conntrack_stat *st;
3734 if (!cpu_possible(cpu))
3737 st = per_cpu_ptr(net->ct.stat, cpu);
3738 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3748 static int ctnetlink_stat_exp_cpu(struct sk_buff *skb,
3749 const struct nfnl_info *info,
3750 const struct nlattr * const cda[])
3752 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3753 struct netlink_dump_control c = {
3754 .dump = ctnetlink_exp_stat_cpu_dump,
3756 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3762 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3763 static struct nf_ct_event_notifier ctnl_notifier = {
3764 .ct_event = ctnetlink_conntrack_event,
3765 .exp_event = ctnetlink_expect_event,
3769 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3770 [IPCTNL_MSG_CT_NEW] = {
3771 .call = ctnetlink_new_conntrack,
3772 .type = NFNL_CB_MUTEX,
3773 .attr_count = CTA_MAX,
3774 .policy = ct_nla_policy
3776 [IPCTNL_MSG_CT_GET] = {
3777 .call = ctnetlink_get_conntrack,
3778 .type = NFNL_CB_MUTEX,
3779 .attr_count = CTA_MAX,
3780 .policy = ct_nla_policy
3782 [IPCTNL_MSG_CT_DELETE] = {
3783 .call = ctnetlink_del_conntrack,
3784 .type = NFNL_CB_MUTEX,
3785 .attr_count = CTA_MAX,
3786 .policy = ct_nla_policy
3788 [IPCTNL_MSG_CT_GET_CTRZERO] = {
3789 .call = ctnetlink_get_conntrack,
3790 .type = NFNL_CB_MUTEX,
3791 .attr_count = CTA_MAX,
3792 .policy = ct_nla_policy
3794 [IPCTNL_MSG_CT_GET_STATS_CPU] = {
3795 .call = ctnetlink_stat_ct_cpu,
3796 .type = NFNL_CB_MUTEX,
3798 [IPCTNL_MSG_CT_GET_STATS] = {
3799 .call = ctnetlink_stat_ct,
3800 .type = NFNL_CB_MUTEX,
3802 [IPCTNL_MSG_CT_GET_DYING] = {
3803 .call = ctnetlink_get_ct_dying,
3804 .type = NFNL_CB_MUTEX,
3806 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = {
3807 .call = ctnetlink_get_ct_unconfirmed,
3808 .type = NFNL_CB_MUTEX,
3812 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3813 [IPCTNL_MSG_EXP_GET] = {
3814 .call = ctnetlink_get_expect,
3815 .type = NFNL_CB_MUTEX,
3816 .attr_count = CTA_EXPECT_MAX,
3817 .policy = exp_nla_policy
3819 [IPCTNL_MSG_EXP_NEW] = {
3820 .call = ctnetlink_new_expect,
3821 .type = NFNL_CB_MUTEX,
3822 .attr_count = CTA_EXPECT_MAX,
3823 .policy = exp_nla_policy
3825 [IPCTNL_MSG_EXP_DELETE] = {
3826 .call = ctnetlink_del_expect,
3827 .type = NFNL_CB_MUTEX,
3828 .attr_count = CTA_EXPECT_MAX,
3829 .policy = exp_nla_policy
3831 [IPCTNL_MSG_EXP_GET_STATS_CPU] = {
3832 .call = ctnetlink_stat_exp_cpu,
3833 .type = NFNL_CB_MUTEX,
3837 static const struct nfnetlink_subsystem ctnl_subsys = {
3838 .name = "conntrack",
3839 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3840 .cb_count = IPCTNL_MSG_MAX,
3844 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3845 .name = "conntrack_expect",
3846 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3847 .cb_count = IPCTNL_MSG_EXP_MAX,
3851 MODULE_ALIAS("ip_conntrack_netlink");
3852 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3853 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3855 static int __net_init ctnetlink_net_init(struct net *net)
3857 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3858 nf_conntrack_register_notifier(net, &ctnl_notifier);
3863 static void ctnetlink_net_pre_exit(struct net *net)
3865 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3866 nf_conntrack_unregister_notifier(net);
3870 static struct pernet_operations ctnetlink_net_ops = {
3871 .init = ctnetlink_net_init,
3872 .pre_exit = ctnetlink_net_pre_exit,
3875 static int __init ctnetlink_init(void)
3879 ret = nfnetlink_subsys_register(&ctnl_subsys);
3881 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3885 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3887 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3888 goto err_unreg_subsys;
3891 ret = register_pernet_subsys(&ctnetlink_net_ops);
3893 pr_err("ctnetlink_init: cannot register pernet operations\n");
3894 goto err_unreg_exp_subsys;
3896 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3897 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3898 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3902 err_unreg_exp_subsys:
3903 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3905 nfnetlink_subsys_unregister(&ctnl_subsys);
3910 static void __exit ctnetlink_exit(void)
3912 unregister_pernet_subsys(&ctnetlink_net_ops);
3913 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3914 nfnetlink_subsys_unregister(&ctnl_subsys);
3915 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3916 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3921 module_init(ctnetlink_init);
3922 module_exit(ctnetlink_exit);