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");
60 MODULE_DESCRIPTION("List and change connection tracking table");
62 struct ctnetlink_list_dump_ctx {
68 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
69 const struct nf_conntrack_tuple *tuple,
70 const struct nf_conntrack_l4proto *l4proto)
73 struct nlattr *nest_parms;
75 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO);
78 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
81 if (likely(l4proto->tuple_to_nlattr))
82 ret = l4proto->tuple_to_nlattr(skb, tuple);
84 nla_nest_end(skb, nest_parms);
92 static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
93 const struct nf_conntrack_tuple *tuple)
95 if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
96 nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
101 static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
102 const struct nf_conntrack_tuple *tuple)
104 if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
105 nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
110 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
111 const struct nf_conntrack_tuple *tuple)
114 struct nlattr *nest_parms;
116 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP);
118 goto nla_put_failure;
120 switch (tuple->src.l3num) {
122 ret = ipv4_tuple_to_nlattr(skb, tuple);
125 ret = ipv6_tuple_to_nlattr(skb, tuple);
129 nla_nest_end(skb, nest_parms);
137 static int ctnetlink_dump_tuples(struct sk_buff *skb,
138 const struct nf_conntrack_tuple *tuple)
140 const struct nf_conntrack_l4proto *l4proto;
144 ret = ctnetlink_dump_tuples_ip(skb, tuple);
147 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
148 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
154 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
155 const struct nf_conntrack_zone *zone, int dir)
157 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
159 if (nla_put_be16(skb, attrtype, htons(zone->id)))
160 goto nla_put_failure;
167 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
169 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
170 goto nla_put_failure;
177 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct,
182 if (nf_ct_is_confirmed(ct))
183 timeout = nf_ct_expires(ct) / HZ;
185 timeout = ct->timeout / HZ;
187 if (skip_zero && timeout == 0)
190 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
191 goto nla_put_failure;
198 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct,
201 const struct nf_conntrack_l4proto *l4proto;
202 struct nlattr *nest_proto;
205 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
206 if (!l4proto->to_nlattr)
209 nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
211 goto nla_put_failure;
213 ret = l4proto->to_nlattr(skb, nest_proto, ct, destroy);
215 nla_nest_end(skb, nest_proto);
223 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
224 const struct nf_conn *ct)
226 struct nlattr *nest_helper;
227 const struct nf_conn_help *help = nfct_help(ct);
228 struct nf_conntrack_helper *helper;
234 helper = rcu_dereference(help->helper);
238 nest_helper = nla_nest_start(skb, CTA_HELP);
240 goto nla_put_failure;
241 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
242 goto nla_put_failure;
244 if (helper->to_nlattr)
245 helper->to_nlattr(skb, ct);
247 nla_nest_end(skb, nest_helper);
258 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
259 enum ip_conntrack_dir dir, int type)
261 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
262 struct nf_conn_counter *counter = acct->counter;
263 struct nlattr *nest_count;
266 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
267 pkts = atomic64_xchg(&counter[dir].packets, 0);
268 bytes = atomic64_xchg(&counter[dir].bytes, 0);
270 pkts = atomic64_read(&counter[dir].packets);
271 bytes = atomic64_read(&counter[dir].bytes);
274 nest_count = nla_nest_start(skb, attr);
276 goto nla_put_failure;
278 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
280 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
282 goto nla_put_failure;
284 nla_nest_end(skb, nest_count);
293 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
295 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
300 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
302 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
309 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
311 struct nlattr *nest_count;
312 const struct nf_conn_tstamp *tstamp;
314 tstamp = nf_conn_tstamp_find(ct);
318 nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
320 goto nla_put_failure;
322 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
323 CTA_TIMESTAMP_PAD) ||
324 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
325 cpu_to_be64(tstamp->stop),
327 goto nla_put_failure;
328 nla_nest_end(skb, nest_count);
336 #ifdef CONFIG_NF_CONNTRACK_MARK
337 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct,
340 u32 mark = READ_ONCE(ct->mark);
345 if (nla_put_be32(skb, CTA_MARK, htonl(mark)))
346 goto nla_put_failure;
353 #define ctnetlink_dump_mark(a, b, c) (0)
356 #ifdef CONFIG_NF_CONNTRACK_SECMARK
357 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
359 struct nlattr *nest_secctx;
363 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
368 nest_secctx = nla_nest_start(skb, CTA_SECCTX);
370 goto nla_put_failure;
372 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
373 goto nla_put_failure;
374 nla_nest_end(skb, nest_secctx);
378 security_release_secctx(secctx, len);
382 #define ctnetlink_dump_secctx(a, b) (0)
385 #ifdef CONFIG_NF_CONNTRACK_LABELS
386 static inline int ctnetlink_label_size(const struct nf_conn *ct)
388 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
392 return nla_total_size(sizeof(labels->bits));
396 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
398 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
406 if (labels->bits[i] != 0)
407 return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
410 } while (i < ARRAY_SIZE(labels->bits));
415 #define ctnetlink_dump_labels(a, b) (0)
416 #define ctnetlink_label_size(a) (0)
419 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
421 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
423 struct nlattr *nest_parms;
425 if (!(ct->status & IPS_EXPECTED))
428 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
430 goto nla_put_failure;
431 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
432 goto nla_put_failure;
433 nla_nest_end(skb, nest_parms);
442 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
444 struct nlattr *nest_parms;
446 nest_parms = nla_nest_start(skb, type);
448 goto nla_put_failure;
450 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
451 htonl(seq->correction_pos)) ||
452 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
453 htonl(seq->offset_before)) ||
454 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
455 htonl(seq->offset_after)))
456 goto nla_put_failure;
458 nla_nest_end(skb, nest_parms);
466 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
468 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
469 struct nf_ct_seqadj *seq;
471 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
474 spin_lock_bh(&ct->lock);
475 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
476 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
479 seq = &seqadj->seq[IP_CT_DIR_REPLY];
480 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
483 spin_unlock_bh(&ct->lock);
486 spin_unlock_bh(&ct->lock);
490 static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
492 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
493 struct nlattr *nest_parms;
498 nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
500 goto nla_put_failure;
502 if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
503 nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
504 nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
505 goto nla_put_failure;
507 nla_nest_end(skb, nest_parms);
515 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
517 __be32 id = (__force __be32)nf_ct_get_id(ct);
519 if (nla_put_be32(skb, CTA_ID, id))
520 goto nla_put_failure;
527 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
529 if (nla_put_be32(skb, CTA_USE, htonl(refcount_read(&ct->ct_general.use))))
530 goto nla_put_failure;
537 /* all these functions access ct->ext. Caller must either hold a reference
538 * on ct or prevent its deletion by holding either the bucket spinlock or
539 * pcpu dying list lock.
541 static int ctnetlink_dump_extinfo(struct sk_buff *skb,
542 struct nf_conn *ct, u32 type)
544 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
545 ctnetlink_dump_timestamp(skb, ct) < 0 ||
546 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
547 ctnetlink_dump_labels(skb, ct) < 0 ||
548 ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
549 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
555 static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
557 if (ctnetlink_dump_status(skb, ct) < 0 ||
558 ctnetlink_dump_mark(skb, ct, true) < 0 ||
559 ctnetlink_dump_secctx(skb, ct) < 0 ||
560 ctnetlink_dump_id(skb, ct) < 0 ||
561 ctnetlink_dump_use(skb, ct) < 0 ||
562 ctnetlink_dump_master(skb, ct) < 0)
565 if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
566 (ctnetlink_dump_timeout(skb, ct, false) < 0 ||
567 ctnetlink_dump_protoinfo(skb, ct, false) < 0))
574 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
575 struct nf_conn *ct, bool extinfo, unsigned int flags)
577 const struct nf_conntrack_zone *zone;
578 struct nlmsghdr *nlh;
579 struct nlattr *nest_parms;
583 flags |= NLM_F_MULTI;
584 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
585 nlh = nfnl_msg_put(skb, portid, seq, event, flags, nf_ct_l3num(ct),
590 zone = nf_ct_zone(ct);
592 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
594 goto nla_put_failure;
595 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
596 goto nla_put_failure;
597 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
598 NF_CT_ZONE_DIR_ORIG) < 0)
599 goto nla_put_failure;
600 nla_nest_end(skb, nest_parms);
602 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
604 goto nla_put_failure;
605 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
606 goto nla_put_failure;
607 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
608 NF_CT_ZONE_DIR_REPL) < 0)
609 goto nla_put_failure;
610 nla_nest_end(skb, nest_parms);
612 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
613 NF_CT_DEFAULT_ZONE_DIR) < 0)
614 goto nla_put_failure;
616 if (ctnetlink_dump_info(skb, ct) < 0)
617 goto nla_put_failure;
618 if (extinfo && ctnetlink_dump_extinfo(skb, ct, type) < 0)
619 goto nla_put_failure;
626 nlmsg_cancel(skb, nlh);
630 static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
631 [CTA_IP_V4_SRC] = { .type = NLA_U32 },
632 [CTA_IP_V4_DST] = { .type = NLA_U32 },
633 [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
634 [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
637 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
638 static size_t ctnetlink_proto_size(const struct nf_conn *ct)
640 const struct nf_conntrack_l4proto *l4proto;
641 size_t len, len4 = 0;
643 len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
644 len *= 3u; /* ORIG, REPLY, MASTER */
646 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
647 len += l4proto->nlattr_size;
648 if (l4proto->nlattr_tuple_size) {
649 len4 = l4proto->nlattr_tuple_size();
650 len4 *= 3u; /* ORIG, REPLY, MASTER */
657 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
659 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
661 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
662 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
663 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
667 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
669 #ifdef CONFIG_NF_CONNTRACK_SECMARK
672 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
676 return nla_total_size(0) /* CTA_SECCTX */
677 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
683 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
685 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
686 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
688 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
694 #ifdef CONFIG_NF_CONNTRACK_EVENTS
695 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
697 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
698 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
699 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
700 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
701 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
702 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
703 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
704 + ctnetlink_acct_size(ct)
705 + ctnetlink_timestamp_size(ct)
706 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
707 + nla_total_size(0) /* CTA_PROTOINFO */
708 + nla_total_size(0) /* CTA_HELP */
709 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
710 + ctnetlink_secctx_size(ct)
711 #if IS_ENABLED(CONFIG_NF_NAT)
712 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
713 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
715 #ifdef CONFIG_NF_CONNTRACK_MARK
716 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
718 #ifdef CONFIG_NF_CONNTRACK_ZONES
719 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
721 + ctnetlink_proto_size(ct)
722 + ctnetlink_label_size(ct)
727 ctnetlink_conntrack_event(unsigned int events, const struct nf_ct_event *item)
729 const struct nf_conntrack_zone *zone;
731 struct nlmsghdr *nlh;
732 struct nlattr *nest_parms;
733 struct nf_conn *ct = item->ct;
736 unsigned int flags = 0, group;
739 if (events & (1 << IPCT_DESTROY)) {
740 type = IPCTNL_MSG_CT_DELETE;
741 group = NFNLGRP_CONNTRACK_DESTROY;
742 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
743 type = IPCTNL_MSG_CT_NEW;
744 flags = NLM_F_CREATE|NLM_F_EXCL;
745 group = NFNLGRP_CONNTRACK_NEW;
747 type = IPCTNL_MSG_CT_NEW;
748 group = NFNLGRP_CONNTRACK_UPDATE;
753 if (!item->report && !nfnetlink_has_listeners(net, group))
756 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
760 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
761 nlh = nfnl_msg_put(skb, item->portid, 0, type, flags, nf_ct_l3num(ct),
766 zone = nf_ct_zone(ct);
768 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
770 goto nla_put_failure;
771 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
772 goto nla_put_failure;
773 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
774 NF_CT_ZONE_DIR_ORIG) < 0)
775 goto nla_put_failure;
776 nla_nest_end(skb, nest_parms);
778 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
780 goto nla_put_failure;
781 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
782 goto nla_put_failure;
783 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
784 NF_CT_ZONE_DIR_REPL) < 0)
785 goto nla_put_failure;
786 nla_nest_end(skb, nest_parms);
788 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
789 NF_CT_DEFAULT_ZONE_DIR) < 0)
790 goto nla_put_failure;
792 if (ctnetlink_dump_id(skb, ct) < 0)
793 goto nla_put_failure;
795 if (ctnetlink_dump_status(skb, ct) < 0)
796 goto nla_put_failure;
798 if (events & (1 << IPCT_DESTROY)) {
799 if (ctnetlink_dump_timeout(skb, ct, true) < 0)
800 goto nla_put_failure;
802 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
803 ctnetlink_dump_timestamp(skb, ct) < 0 ||
804 ctnetlink_dump_protoinfo(skb, ct, true) < 0)
805 goto nla_put_failure;
807 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
808 goto nla_put_failure;
810 if (events & (1 << IPCT_PROTOINFO) &&
811 ctnetlink_dump_protoinfo(skb, ct, false) < 0)
812 goto nla_put_failure;
814 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
815 && ctnetlink_dump_helpinfo(skb, ct) < 0)
816 goto nla_put_failure;
818 #ifdef CONFIG_NF_CONNTRACK_SECMARK
819 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
820 && ctnetlink_dump_secctx(skb, ct) < 0)
821 goto nla_put_failure;
823 if (events & (1 << IPCT_LABEL) &&
824 ctnetlink_dump_labels(skb, ct) < 0)
825 goto nla_put_failure;
827 if (events & (1 << IPCT_RELATED) &&
828 ctnetlink_dump_master(skb, ct) < 0)
829 goto nla_put_failure;
831 if (events & (1 << IPCT_SEQADJ) &&
832 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
833 goto nla_put_failure;
835 if (events & (1 << IPCT_SYNPROXY) &&
836 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
837 goto nla_put_failure;
840 #ifdef CONFIG_NF_CONNTRACK_MARK
841 if (ctnetlink_dump_mark(skb, ct, events & (1 << IPCT_MARK)))
842 goto nla_put_failure;
845 err = nfnetlink_send(skb, net, item->portid, group, item->report,
847 if (err == -ENOBUFS || err == -EAGAIN)
853 nlmsg_cancel(skb, nlh);
857 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
862 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
864 static int ctnetlink_done(struct netlink_callback *cb)
867 nf_ct_put((struct nf_conn *)cb->args[1]);
872 struct ctnetlink_filter_u32 {
877 struct ctnetlink_filter {
881 u_int32_t orig_flags;
882 u_int32_t reply_flags;
884 struct nf_conntrack_tuple orig;
885 struct nf_conntrack_tuple reply;
886 struct nf_conntrack_zone zone;
888 struct ctnetlink_filter_u32 mark;
889 struct ctnetlink_filter_u32 status;
892 static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
893 [CTA_FILTER_ORIG_FLAGS] = { .type = NLA_U32 },
894 [CTA_FILTER_REPLY_FLAGS] = { .type = NLA_U32 },
897 static int ctnetlink_parse_filter(const struct nlattr *attr,
898 struct ctnetlink_filter *filter)
900 struct nlattr *tb[CTA_FILTER_MAX + 1];
903 ret = nla_parse_nested(tb, CTA_FILTER_MAX, attr, cta_filter_nla_policy,
908 if (tb[CTA_FILTER_ORIG_FLAGS]) {
909 filter->orig_flags = nla_get_u32(tb[CTA_FILTER_ORIG_FLAGS]);
910 if (filter->orig_flags & ~CTA_FILTER_F_ALL)
914 if (tb[CTA_FILTER_REPLY_FLAGS]) {
915 filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
916 if (filter->reply_flags & ~CTA_FILTER_F_ALL)
923 static int ctnetlink_parse_zone(const struct nlattr *attr,
924 struct nf_conntrack_zone *zone);
925 static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
926 struct nf_conntrack_tuple *tuple,
927 u32 type, u_int8_t l3num,
928 struct nf_conntrack_zone *zone,
931 static int ctnetlink_filter_parse_mark(struct ctnetlink_filter_u32 *mark,
932 const struct nlattr * const cda[])
934 #ifdef CONFIG_NF_CONNTRACK_MARK
936 mark->val = ntohl(nla_get_be32(cda[CTA_MARK]));
938 if (cda[CTA_MARK_MASK])
939 mark->mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
941 mark->mask = 0xffffffff;
942 } else if (cda[CTA_MARK_MASK]) {
949 static int ctnetlink_filter_parse_status(struct ctnetlink_filter_u32 *status,
950 const struct nlattr * const cda[])
952 if (cda[CTA_STATUS]) {
953 status->val = ntohl(nla_get_be32(cda[CTA_STATUS]));
954 if (cda[CTA_STATUS_MASK])
955 status->mask = ntohl(nla_get_be32(cda[CTA_STATUS_MASK]));
957 status->mask = status->val;
959 /* status->val == 0? always true, else always false. */
960 if (status->mask == 0)
962 } else if (cda[CTA_STATUS_MASK]) {
966 /* CTA_STATUS is NLA_U32, if this fires UAPI needs to be extended */
967 BUILD_BUG_ON(__IPS_MAX_BIT >= 32);
971 static struct ctnetlink_filter *
972 ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
974 struct ctnetlink_filter *filter;
977 #ifndef CONFIG_NF_CONNTRACK_MARK
978 if (cda[CTA_MARK] || cda[CTA_MARK_MASK])
979 return ERR_PTR(-EOPNOTSUPP);
982 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
984 return ERR_PTR(-ENOMEM);
986 filter->family = family;
988 err = ctnetlink_filter_parse_mark(&filter->mark, cda);
992 err = ctnetlink_filter_parse_status(&filter->status, cda);
997 err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
1000 filter->zone_filter = true;
1003 if (!cda[CTA_FILTER])
1006 err = ctnetlink_parse_filter(cda[CTA_FILTER], filter);
1010 if (filter->orig_flags) {
1011 if (!cda[CTA_TUPLE_ORIG]) {
1016 err = ctnetlink_parse_tuple_filter(cda, &filter->orig,
1020 filter->orig_flags);
1025 if (filter->reply_flags) {
1026 if (!cda[CTA_TUPLE_REPLY]) {
1031 err = ctnetlink_parse_tuple_filter(cda, &filter->reply,
1035 filter->reply_flags);
1045 return ERR_PTR(err);
1048 static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
1050 return family || cda[CTA_MARK] || cda[CTA_FILTER] || cda[CTA_STATUS] || cda[CTA_ZONE];
1053 static int ctnetlink_start(struct netlink_callback *cb)
1055 const struct nlattr * const *cda = cb->data;
1056 struct ctnetlink_filter *filter = NULL;
1057 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1058 u8 family = nfmsg->nfgen_family;
1060 if (ctnetlink_needs_filter(family, cda)) {
1061 filter = ctnetlink_alloc_filter(cda, family);
1063 return PTR_ERR(filter);
1070 static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
1071 struct nf_conntrack_tuple *ct_tuple,
1072 u_int32_t flags, int family)
1076 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1077 filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
1080 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1081 filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
1085 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1086 !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
1087 &ct_tuple->src.u3.in6))
1090 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1091 !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
1092 &ct_tuple->dst.u3.in6))
1097 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
1098 filter_tuple->dst.protonum != ct_tuple->dst.protonum)
1101 switch (ct_tuple->dst.protonum) {
1104 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
1105 filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
1108 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
1109 filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
1113 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
1114 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1116 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
1117 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1119 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
1120 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1123 case IPPROTO_ICMPV6:
1124 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
1125 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1127 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
1128 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1130 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
1131 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1139 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
1141 struct ctnetlink_filter *filter = data;
1142 struct nf_conntrack_tuple *tuple;
1148 /* Match entries of a given L3 protocol number.
1149 * If it is not specified, ie. l3proto == 0,
1150 * then match everything.
1152 if (filter->family && nf_ct_l3num(ct) != filter->family)
1155 if (filter->zone_filter &&
1156 !nf_ct_zone_equal_any(ct, &filter->zone))
1159 if (filter->orig_flags) {
1160 tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
1161 if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
1167 if (filter->reply_flags) {
1168 tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
1169 if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
1170 filter->reply_flags,
1175 #ifdef CONFIG_NF_CONNTRACK_MARK
1176 if ((READ_ONCE(ct->mark) & filter->mark.mask) != filter->mark.val)
1179 status = (u32)READ_ONCE(ct->status);
1180 if ((status & filter->status.mask) != filter->status.val)
1191 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1193 unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
1194 struct net *net = sock_net(skb->sk);
1195 struct nf_conn *ct, *last;
1196 struct nf_conntrack_tuple_hash *h;
1197 struct hlist_nulls_node *n;
1198 struct nf_conn *nf_ct_evict[8];
1202 last = (struct nf_conn *)cb->args[1];
1206 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
1210 if (nf_ct_should_gc(nf_ct_evict[i]))
1211 nf_ct_kill(nf_ct_evict[i]);
1212 nf_ct_put(nf_ct_evict[i]);
1215 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
1216 nf_conntrack_lock(lockp);
1217 if (cb->args[0] >= nf_conntrack_htable_size) {
1221 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
1223 ct = nf_ct_tuplehash_to_ctrack(h);
1224 if (nf_ct_is_expired(ct)) {
1225 /* need to defer nf_ct_kill() until lock is released */
1226 if (i < ARRAY_SIZE(nf_ct_evict) &&
1227 refcount_inc_not_zero(&ct->ct_general.use))
1228 nf_ct_evict[i++] = ct;
1232 if (!net_eq(net, nf_ct_net(ct)))
1235 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
1243 if (!ctnetlink_filter_match(ct, cb->data))
1247 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1249 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1252 nf_conntrack_get(&ct->ct_general);
1253 cb->args[1] = (unsigned long)ct;
1267 /* nf ct hash resize happened, now clear the leftover. */
1268 if ((struct nf_conn *)cb->args[1] == last)
1276 if (nf_ct_should_gc(nf_ct_evict[i]))
1277 nf_ct_kill(nf_ct_evict[i]);
1278 nf_ct_put(nf_ct_evict[i]);
1284 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
1285 struct nf_conntrack_tuple *t,
1288 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1289 if (!tb[CTA_IP_V4_SRC])
1292 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1295 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1296 if (!tb[CTA_IP_V4_DST])
1299 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1305 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1306 struct nf_conntrack_tuple *t,
1309 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1310 if (!tb[CTA_IP_V6_SRC])
1313 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1316 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1317 if (!tb[CTA_IP_V6_DST])
1320 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1326 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1327 struct nf_conntrack_tuple *tuple,
1330 struct nlattr *tb[CTA_IP_MAX+1];
1333 ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr,
1334 cta_ip_nla_policy, NULL);
1338 switch (tuple->src.l3num) {
1340 ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
1343 ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
1350 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1351 [CTA_PROTO_NUM] = { .type = NLA_U8 },
1354 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1355 struct nf_conntrack_tuple *tuple,
1358 const struct nf_conntrack_l4proto *l4proto;
1359 struct nlattr *tb[CTA_PROTO_MAX+1];
1362 ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1363 proto_nla_policy, NULL);
1367 if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
1370 if (!tb[CTA_PROTO_NUM])
1373 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1376 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1378 if (likely(l4proto->nlattr_to_tuple)) {
1379 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1380 l4proto->nla_policy,
1383 ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
1392 ctnetlink_parse_zone(const struct nlattr *attr,
1393 struct nf_conntrack_zone *zone)
1395 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1396 NF_CT_DEFAULT_ZONE_DIR, 0);
1397 #ifdef CONFIG_NF_CONNTRACK_ZONES
1399 zone->id = ntohs(nla_get_be16(attr));
1408 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1409 struct nf_conntrack_zone *zone)
1413 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1416 ret = ctnetlink_parse_zone(attr, zone);
1420 if (type == CTA_TUPLE_REPLY)
1421 zone->dir = NF_CT_ZONE_DIR_REPL;
1423 zone->dir = NF_CT_ZONE_DIR_ORIG;
1428 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1429 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1430 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1431 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1434 #define CTA_FILTER_F_ALL_CTA_PROTO \
1435 (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
1436 CTA_FILTER_F_CTA_PROTO_DST_PORT | \
1437 CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
1438 CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
1439 CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
1440 CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
1441 CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
1442 CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
1445 ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
1446 struct nf_conntrack_tuple *tuple, u32 type,
1447 u_int8_t l3num, struct nf_conntrack_zone *zone,
1450 struct nlattr *tb[CTA_TUPLE_MAX+1];
1453 memset(tuple, 0, sizeof(*tuple));
1455 err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1456 tuple_nla_policy, NULL);
1460 if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1462 tuple->src.l3num = l3num;
1464 if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
1465 flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1466 if (!tb[CTA_TUPLE_IP])
1469 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
1474 if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
1475 if (!tb[CTA_TUPLE_PROTO])
1478 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
1481 } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
1482 /* Can't manage proto flags without a protonum */
1486 if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
1490 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1496 /* orig and expect tuples get DIR_ORIGINAL */
1497 if (type == CTA_TUPLE_REPLY)
1498 tuple->dst.dir = IP_CT_DIR_REPLY;
1500 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1506 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1507 struct nf_conntrack_tuple *tuple, u32 type,
1508 u_int8_t l3num, struct nf_conntrack_zone *zone)
1510 return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
1511 CTA_FILTER_FLAG(ALL));
1514 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1515 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1516 .len = NF_CT_HELPER_NAME_LEN - 1 },
1519 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1520 struct nlattr **helpinfo)
1523 struct nlattr *tb[CTA_HELP_MAX+1];
1525 err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1526 help_nla_policy, NULL);
1530 if (!tb[CTA_HELP_NAME])
1533 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1535 if (tb[CTA_HELP_INFO])
1536 *helpinfo = tb[CTA_HELP_INFO];
1541 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1542 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1543 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1544 [CTA_STATUS] = { .type = NLA_U32 },
1545 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1546 [CTA_HELP] = { .type = NLA_NESTED },
1547 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1548 [CTA_TIMEOUT] = { .type = NLA_U32 },
1549 [CTA_MARK] = { .type = NLA_U32 },
1550 [CTA_ID] = { .type = NLA_U32 },
1551 [CTA_NAT_DST] = { .type = NLA_NESTED },
1552 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1553 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1554 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1555 [CTA_ZONE] = { .type = NLA_U16 },
1556 [CTA_MARK_MASK] = { .type = NLA_U32 },
1557 [CTA_LABELS] = { .type = NLA_BINARY,
1558 .len = NF_CT_LABELS_MAX_SIZE },
1559 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1560 .len = NF_CT_LABELS_MAX_SIZE },
1561 [CTA_FILTER] = { .type = NLA_NESTED },
1562 [CTA_STATUS_MASK] = { .type = NLA_U32 },
1565 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1567 return ctnetlink_filter_match(ct, data);
1570 static int ctnetlink_flush_conntrack(struct net *net,
1571 const struct nlattr * const cda[],
1572 u32 portid, int report, u8 family)
1574 struct ctnetlink_filter *filter = NULL;
1575 struct nf_ct_iter_data iter = {
1581 if (ctnetlink_needs_filter(family, cda)) {
1582 if (cda[CTA_FILTER])
1585 filter = ctnetlink_alloc_filter(cda, family);
1587 return PTR_ERR(filter);
1592 nf_ct_iterate_cleanup_net(ctnetlink_flush_iterate, &iter);
1598 static int ctnetlink_del_conntrack(struct sk_buff *skb,
1599 const struct nfnl_info *info,
1600 const struct nlattr * const cda[])
1602 u8 family = info->nfmsg->nfgen_family;
1603 struct nf_conntrack_tuple_hash *h;
1604 struct nf_conntrack_tuple tuple;
1605 struct nf_conntrack_zone zone;
1609 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1613 if (cda[CTA_TUPLE_ORIG])
1614 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1616 else if (cda[CTA_TUPLE_REPLY])
1617 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1620 u_int8_t u3 = info->nfmsg->version ? family : AF_UNSPEC;
1622 return ctnetlink_flush_conntrack(info->net, cda,
1623 NETLINK_CB(skb).portid,
1624 nlmsg_report(info->nlh), u3);
1630 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1634 ct = nf_ct_tuplehash_to_ctrack(h);
1637 __be32 id = nla_get_be32(cda[CTA_ID]);
1639 if (id != (__force __be32)nf_ct_get_id(ct)) {
1645 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(info->nlh));
1651 static int ctnetlink_get_conntrack(struct sk_buff *skb,
1652 const struct nfnl_info *info,
1653 const struct nlattr * const cda[])
1655 u_int8_t u3 = info->nfmsg->nfgen_family;
1656 struct nf_conntrack_tuple_hash *h;
1657 struct nf_conntrack_tuple tuple;
1658 struct nf_conntrack_zone zone;
1659 struct sk_buff *skb2;
1663 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1664 struct netlink_dump_control c = {
1665 .start = ctnetlink_start,
1666 .dump = ctnetlink_dump_table,
1667 .done = ctnetlink_done,
1668 .data = (void *)cda,
1671 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1674 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1678 if (cda[CTA_TUPLE_ORIG])
1679 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1681 else if (cda[CTA_TUPLE_REPLY])
1682 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1690 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1694 ct = nf_ct_tuplehash_to_ctrack(h);
1696 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1702 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid,
1703 info->nlh->nlmsg_seq,
1704 NFNL_MSG_TYPE(info->nlh->nlmsg_type), ct,
1712 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
1715 static int ctnetlink_done_list(struct netlink_callback *cb)
1717 struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
1720 nf_ct_put(ctx->last);
1725 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1726 static int ctnetlink_dump_one_entry(struct sk_buff *skb,
1727 struct netlink_callback *cb,
1731 struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
1732 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1733 u8 l3proto = nfmsg->nfgen_family;
1736 if (l3proto && nf_ct_l3num(ct) != l3proto)
1740 if (ct != ctx->last)
1746 /* We can't dump extension info for the unconfirmed
1747 * list because unconfirmed conntracks can have
1748 * ct->ext reallocated (and thus freed).
1750 * In the dying list case ct->ext can't be free'd
1751 * until after we drop pcpu->lock.
1753 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1755 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1758 if (!refcount_inc_not_zero(&ct->ct_general.use))
1769 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1775 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1777 struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
1778 struct nf_conn *last = ctx->last;
1779 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1780 const struct net *net = sock_net(skb->sk);
1781 struct nf_conntrack_net_ecache *ecache_net;
1782 struct nf_conntrack_tuple_hash *h;
1783 struct hlist_nulls_node *n;
1791 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1792 ecache_net = nf_conn_pernet_ecache(net);
1793 spin_lock_bh(&ecache_net->dying_lock);
1795 hlist_nulls_for_each_entry(h, n, &ecache_net->dying_list, hnnode) {
1799 ct = nf_ct_tuplehash_to_ctrack(h);
1800 if (last && last != ct)
1803 res = ctnetlink_dump_one_entry(skb, cb, ct, true);
1805 spin_unlock_bh(&ecache_net->dying_lock);
1814 spin_unlock_bh(&ecache_net->dying_lock);
1822 static int ctnetlink_get_ct_dying(struct sk_buff *skb,
1823 const struct nfnl_info *info,
1824 const struct nlattr * const cda[])
1826 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1827 struct netlink_dump_control c = {
1828 .dump = ctnetlink_dump_dying,
1829 .done = ctnetlink_done_list,
1831 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1837 static int ctnetlink_get_ct_unconfirmed(struct sk_buff *skb,
1838 const struct nfnl_info *info,
1839 const struct nlattr * const cda[])
1841 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1842 struct netlink_dump_control c = {
1843 .dump = ctnetlink_dump_unconfirmed,
1844 .done = ctnetlink_done_list,
1846 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1852 #if IS_ENABLED(CONFIG_NF_NAT)
1854 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1855 enum nf_nat_manip_type manip,
1856 const struct nlattr *attr)
1859 const struct nf_nat_hook *nat_hook;
1862 nat_hook = rcu_dereference(nf_nat_hook);
1864 #ifdef CONFIG_MODULES
1866 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1867 if (request_module("nf-nat") < 0) {
1868 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1872 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1874 nat_hook = rcu_dereference(nf_nat_hook);
1881 err = nat_hook->parse_nat_setup(ct, manip, attr);
1882 if (err == -EAGAIN) {
1883 #ifdef CONFIG_MODULES
1885 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1886 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1887 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1891 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1902 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1904 return nf_ct_change_status_common(ct, ntohl(nla_get_be32(cda[CTA_STATUS])));
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 (rcu_access_pointer(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 return __nf_ct_change_timeout(ct, (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ);
2002 #if defined(CONFIG_NF_CONNTRACK_MARK)
2003 static void ctnetlink_change_mark(struct nf_conn *ct,
2004 const struct nlattr * const cda[])
2006 u32 mark, newmark, mask = 0;
2008 if (cda[CTA_MARK_MASK])
2009 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2011 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2012 newmark = (READ_ONCE(ct->mark) & mask) ^ mark;
2013 if (newmark != READ_ONCE(ct->mark))
2014 WRITE_ONCE(ct->mark, newmark);
2018 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
2019 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
2020 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
2021 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
2024 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
2025 const struct nlattr * const cda[])
2027 const struct nlattr *attr = cda[CTA_PROTOINFO];
2028 const struct nf_conntrack_l4proto *l4proto;
2029 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
2032 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
2033 protoinfo_policy, NULL);
2037 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
2038 if (l4proto->from_nlattr)
2039 err = l4proto->from_nlattr(tb, ct);
2044 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
2045 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
2046 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
2047 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
2050 static int change_seq_adj(struct nf_ct_seqadj *seq,
2051 const struct nlattr * const attr)
2054 struct nlattr *cda[CTA_SEQADJ_MAX+1];
2056 err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
2057 seqadj_policy, NULL);
2061 if (!cda[CTA_SEQADJ_CORRECTION_POS])
2064 seq->correction_pos =
2065 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
2067 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
2070 seq->offset_before =
2071 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
2073 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
2077 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
2083 ctnetlink_change_seq_adj(struct nf_conn *ct,
2084 const struct nlattr * const cda[])
2086 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
2092 spin_lock_bh(&ct->lock);
2093 if (cda[CTA_SEQ_ADJ_ORIG]) {
2094 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
2095 cda[CTA_SEQ_ADJ_ORIG]);
2099 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2102 if (cda[CTA_SEQ_ADJ_REPLY]) {
2103 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
2104 cda[CTA_SEQ_ADJ_REPLY]);
2108 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2111 spin_unlock_bh(&ct->lock);
2114 spin_unlock_bh(&ct->lock);
2118 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
2119 [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
2120 [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
2121 [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
2124 static int ctnetlink_change_synproxy(struct nf_conn *ct,
2125 const struct nlattr * const cda[])
2127 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
2128 struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
2134 err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
2135 cda[CTA_SYNPROXY], synproxy_policy,
2140 if (!tb[CTA_SYNPROXY_ISN] ||
2141 !tb[CTA_SYNPROXY_ITS] ||
2142 !tb[CTA_SYNPROXY_TSOFF])
2145 synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
2146 synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
2147 synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
2153 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
2155 #ifdef CONFIG_NF_CONNTRACK_LABELS
2156 size_t len = nla_len(cda[CTA_LABELS]);
2157 const void *mask = cda[CTA_LABELS_MASK];
2159 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
2163 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
2164 nla_len(cda[CTA_LABELS_MASK]) != len)
2166 mask = nla_data(cda[CTA_LABELS_MASK]);
2171 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
2178 ctnetlink_change_conntrack(struct nf_conn *ct,
2179 const struct nlattr * const cda[])
2183 /* only allow NAT changes and master assignation for new conntracks */
2184 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
2187 if (cda[CTA_HELP]) {
2188 err = ctnetlink_change_helper(ct, cda);
2193 if (cda[CTA_TIMEOUT]) {
2194 err = ctnetlink_change_timeout(ct, cda);
2199 if (cda[CTA_STATUS]) {
2200 err = ctnetlink_change_status(ct, cda);
2205 if (cda[CTA_PROTOINFO]) {
2206 err = ctnetlink_change_protoinfo(ct, cda);
2211 #if defined(CONFIG_NF_CONNTRACK_MARK)
2213 ctnetlink_change_mark(ct, cda);
2216 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2217 err = ctnetlink_change_seq_adj(ct, cda);
2222 if (cda[CTA_SYNPROXY]) {
2223 err = ctnetlink_change_synproxy(ct, cda);
2228 if (cda[CTA_LABELS]) {
2229 err = ctnetlink_attach_labels(ct, cda);
2237 static struct nf_conn *
2238 ctnetlink_create_conntrack(struct net *net,
2239 const struct nf_conntrack_zone *zone,
2240 const struct nlattr * const cda[],
2241 struct nf_conntrack_tuple *otuple,
2242 struct nf_conntrack_tuple *rtuple,
2247 struct nf_conntrack_helper *helper;
2248 struct nf_conn_tstamp *tstamp;
2251 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
2253 return ERR_PTR(-ENOMEM);
2255 if (!cda[CTA_TIMEOUT])
2259 if (cda[CTA_HELP]) {
2260 char *helpname = NULL;
2261 struct nlattr *helpinfo = NULL;
2263 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
2267 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2268 nf_ct_protonum(ct));
2269 if (helper == NULL) {
2271 #ifdef CONFIG_MODULES
2272 if (request_module("nfct-helper-%s", helpname) < 0) {
2278 helper = __nf_conntrack_helper_find(helpname,
2280 nf_ct_protonum(ct));
2290 struct nf_conn_help *help;
2292 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2297 /* set private helper data if allowed. */
2298 if (helper->from_nlattr)
2299 helper->from_nlattr(helpinfo, ct);
2301 /* disable helper auto-assignment for this entry */
2302 ct->status |= IPS_HELPER;
2303 RCU_INIT_POINTER(help->helper, helper);
2307 err = ctnetlink_setup_nat(ct, cda);
2311 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2312 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2313 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2314 nf_ct_labels_ext_add(ct);
2315 nfct_seqadj_ext_add(ct);
2316 nfct_synproxy_ext_add(ct);
2318 /* we must add conntrack extensions before confirmation. */
2319 ct->status |= IPS_CONFIRMED;
2321 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2322 __nf_ct_set_timeout(ct, timeout);
2324 if (cda[CTA_STATUS]) {
2325 err = ctnetlink_change_status(ct, cda);
2330 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2331 err = ctnetlink_change_seq_adj(ct, cda);
2336 memset(&ct->proto, 0, sizeof(ct->proto));
2337 if (cda[CTA_PROTOINFO]) {
2338 err = ctnetlink_change_protoinfo(ct, cda);
2343 if (cda[CTA_SYNPROXY]) {
2344 err = ctnetlink_change_synproxy(ct, cda);
2349 #if defined(CONFIG_NF_CONNTRACK_MARK)
2351 ctnetlink_change_mark(ct, cda);
2354 /* setup master conntrack: this is a confirmed expectation */
2355 if (cda[CTA_TUPLE_MASTER]) {
2356 struct nf_conntrack_tuple master;
2357 struct nf_conntrack_tuple_hash *master_h;
2358 struct nf_conn *master_ct;
2360 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2365 master_h = nf_conntrack_find_get(net, zone, &master);
2366 if (master_h == NULL) {
2370 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2371 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2372 ct->master = master_ct;
2374 tstamp = nf_conn_tstamp_find(ct);
2376 tstamp->start = ktime_get_real_ns();
2378 err = nf_conntrack_hash_check_insert(ct);
2388 nf_ct_put(ct->master);
2392 nf_conntrack_free(ct);
2393 return ERR_PTR(err);
2396 static int ctnetlink_new_conntrack(struct sk_buff *skb,
2397 const struct nfnl_info *info,
2398 const struct nlattr * const cda[])
2400 struct nf_conntrack_tuple otuple, rtuple;
2401 struct nf_conntrack_tuple_hash *h = NULL;
2402 u_int8_t u3 = info->nfmsg->nfgen_family;
2403 struct nf_conntrack_zone zone;
2407 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2411 if (cda[CTA_TUPLE_ORIG]) {
2412 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2418 if (cda[CTA_TUPLE_REPLY]) {
2419 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2425 if (cda[CTA_TUPLE_ORIG])
2426 h = nf_conntrack_find_get(info->net, &zone, &otuple);
2427 else if (cda[CTA_TUPLE_REPLY])
2428 h = nf_conntrack_find_get(info->net, &zone, &rtuple);
2432 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
2433 enum ip_conntrack_events events;
2435 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2437 if (otuple.dst.protonum != rtuple.dst.protonum)
2440 ct = ctnetlink_create_conntrack(info->net, &zone, cda,
2441 &otuple, &rtuple, u3);
2446 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2447 events = 1 << IPCT_RELATED;
2449 events = 1 << IPCT_NEW;
2451 if (cda[CTA_LABELS] &&
2452 ctnetlink_attach_labels(ct, cda) == 0)
2453 events |= (1 << IPCT_LABEL);
2455 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2456 (1 << IPCT_ASSURED) |
2457 (1 << IPCT_HELPER) |
2458 (1 << IPCT_PROTOINFO) |
2459 (1 << IPCT_SEQADJ) |
2461 (1 << IPCT_SYNPROXY) |
2463 ct, NETLINK_CB(skb).portid,
2464 nlmsg_report(info->nlh));
2470 /* implicit 'else' */
2473 ct = nf_ct_tuplehash_to_ctrack(h);
2474 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL)) {
2475 err = ctnetlink_change_conntrack(ct, cda);
2477 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2478 (1 << IPCT_ASSURED) |
2479 (1 << IPCT_HELPER) |
2481 (1 << IPCT_PROTOINFO) |
2482 (1 << IPCT_SEQADJ) |
2484 (1 << IPCT_SYNPROXY),
2485 ct, NETLINK_CB(skb).portid,
2486 nlmsg_report(info->nlh));
2495 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2496 __u16 cpu, const struct ip_conntrack_stat *st)
2498 struct nlmsghdr *nlh;
2499 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2501 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2502 IPCTNL_MSG_CT_GET_STATS_CPU);
2503 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2504 NFNETLINK_V0, htons(cpu));
2508 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2509 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2510 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2511 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2512 htonl(st->insert_failed)) ||
2513 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2514 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2515 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2516 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2517 htonl(st->search_restart)) ||
2518 nla_put_be32(skb, CTA_STATS_CLASH_RESOLVE,
2519 htonl(st->clash_resolve)) ||
2520 nla_put_be32(skb, CTA_STATS_CHAIN_TOOLONG,
2521 htonl(st->chaintoolong)))
2522 goto nla_put_failure;
2524 nlmsg_end(skb, nlh);
2529 nlmsg_cancel(skb, nlh);
2534 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2537 struct net *net = sock_net(skb->sk);
2539 if (cb->args[0] == nr_cpu_ids)
2542 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2543 const struct ip_conntrack_stat *st;
2545 if (!cpu_possible(cpu))
2548 st = per_cpu_ptr(net->ct.stat, cpu);
2549 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2550 NETLINK_CB(cb->skb).portid,
2560 static int ctnetlink_stat_ct_cpu(struct sk_buff *skb,
2561 const struct nfnl_info *info,
2562 const struct nlattr * const cda[])
2564 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
2565 struct netlink_dump_control c = {
2566 .dump = ctnetlink_ct_stat_cpu_dump,
2568 return netlink_dump_start(info->sk, skb, info->nlh, &c);
2575 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2578 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2579 unsigned int nr_conntracks;
2580 struct nlmsghdr *nlh;
2582 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2583 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2588 nr_conntracks = nf_conntrack_count(net);
2589 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2590 goto nla_put_failure;
2592 if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2593 goto nla_put_failure;
2595 nlmsg_end(skb, nlh);
2600 nlmsg_cancel(skb, nlh);
2604 static int ctnetlink_stat_ct(struct sk_buff *skb, const struct nfnl_info *info,
2605 const struct nlattr * const cda[])
2607 struct sk_buff *skb2;
2610 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2614 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2615 info->nlh->nlmsg_seq,
2616 NFNL_MSG_TYPE(info->nlh->nlmsg_type),
2623 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
2626 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2627 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2628 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2629 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2630 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2631 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2632 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2633 .len = NF_CT_HELPER_NAME_LEN - 1 },
2634 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2635 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2636 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2637 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2638 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2641 static struct nf_conntrack_expect *
2642 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2643 struct nf_conntrack_helper *helper,
2644 struct nf_conntrack_tuple *tuple,
2645 struct nf_conntrack_tuple *mask);
2647 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2649 ctnetlink_glue_build_size(const struct nf_conn *ct)
2651 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2652 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2653 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2654 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2655 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2656 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2657 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2658 + nla_total_size(0) /* CTA_PROTOINFO */
2659 + nla_total_size(0) /* CTA_HELP */
2660 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2661 + ctnetlink_secctx_size(ct)
2662 + ctnetlink_acct_size(ct)
2663 + ctnetlink_timestamp_size(ct)
2664 #if IS_ENABLED(CONFIG_NF_NAT)
2665 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2666 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2668 #ifdef CONFIG_NF_CONNTRACK_MARK
2669 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2671 #ifdef CONFIG_NF_CONNTRACK_ZONES
2672 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2674 + ctnetlink_proto_size(ct)
2678 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2680 const struct nf_conntrack_zone *zone;
2681 struct nlattr *nest_parms;
2683 zone = nf_ct_zone(ct);
2685 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2687 goto nla_put_failure;
2688 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2689 goto nla_put_failure;
2690 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2691 NF_CT_ZONE_DIR_ORIG) < 0)
2692 goto nla_put_failure;
2693 nla_nest_end(skb, nest_parms);
2695 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2697 goto nla_put_failure;
2698 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2699 goto nla_put_failure;
2700 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2701 NF_CT_ZONE_DIR_REPL) < 0)
2702 goto nla_put_failure;
2703 nla_nest_end(skb, nest_parms);
2705 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2706 NF_CT_DEFAULT_ZONE_DIR) < 0)
2707 goto nla_put_failure;
2709 if (ctnetlink_dump_id(skb, ct) < 0)
2710 goto nla_put_failure;
2712 if (ctnetlink_dump_status(skb, ct) < 0)
2713 goto nla_put_failure;
2715 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
2716 goto nla_put_failure;
2718 if (ctnetlink_dump_protoinfo(skb, ct, false) < 0)
2719 goto nla_put_failure;
2721 if (ctnetlink_dump_acct(skb, ct, IPCTNL_MSG_CT_GET) < 0 ||
2722 ctnetlink_dump_timestamp(skb, ct) < 0)
2723 goto nla_put_failure;
2725 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2726 goto nla_put_failure;
2728 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2729 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2730 goto nla_put_failure;
2732 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2733 goto nla_put_failure;
2735 if ((ct->status & IPS_SEQ_ADJUST) &&
2736 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2737 goto nla_put_failure;
2739 if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2740 goto nla_put_failure;
2742 #ifdef CONFIG_NF_CONNTRACK_MARK
2743 if (ctnetlink_dump_mark(skb, ct, true) < 0)
2744 goto nla_put_failure;
2746 if (ctnetlink_dump_labels(skb, ct) < 0)
2747 goto nla_put_failure;
2755 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2756 enum ip_conntrack_info ctinfo,
2757 u_int16_t ct_attr, u_int16_t ct_info_attr)
2759 struct nlattr *nest_parms;
2761 nest_parms = nla_nest_start(skb, ct_attr);
2763 goto nla_put_failure;
2765 if (__ctnetlink_glue_build(skb, ct) < 0)
2766 goto nla_put_failure;
2768 nla_nest_end(skb, nest_parms);
2770 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2771 goto nla_put_failure;
2780 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2782 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2783 unsigned long d = ct->status ^ status;
2785 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2786 /* SEEN_REPLY bit can only be set */
2789 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2790 /* ASSURED bit can only be set */
2793 /* This check is less strict than ctnetlink_change_status()
2794 * because callers often flip IPS_EXPECTED bits when sending
2795 * an NFQA_CT attribute to the kernel. So ignore the
2796 * unchangeable bits but do not error out. Also user programs
2797 * are allowed to clear the bits that they are allowed to change.
2799 __nf_ct_change_status(ct, status, ~status);
2804 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2808 if (cda[CTA_TIMEOUT]) {
2809 err = ctnetlink_change_timeout(ct, cda);
2813 if (cda[CTA_STATUS]) {
2814 err = ctnetlink_update_status(ct, cda);
2818 if (cda[CTA_HELP]) {
2819 err = ctnetlink_change_helper(ct, cda);
2823 if (cda[CTA_LABELS]) {
2824 err = ctnetlink_attach_labels(ct, cda);
2828 #if defined(CONFIG_NF_CONNTRACK_MARK)
2829 if (cda[CTA_MARK]) {
2830 ctnetlink_change_mark(ct, cda);
2837 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2839 struct nlattr *cda[CTA_MAX+1];
2842 ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2847 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2850 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2851 const struct nf_conn *ct,
2852 struct nf_conntrack_tuple *tuple,
2853 struct nf_conntrack_tuple *mask)
2857 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2858 nf_ct_l3num(ct), NULL);
2862 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2863 nf_ct_l3num(ct), NULL);
2867 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2868 u32 portid, u32 report)
2870 struct nlattr *cda[CTA_EXPECT_MAX+1];
2871 struct nf_conntrack_tuple tuple, mask;
2872 struct nf_conntrack_helper *helper = NULL;
2873 struct nf_conntrack_expect *exp;
2876 err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2877 exp_nla_policy, NULL);
2881 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2886 if (cda[CTA_EXPECT_HELP_NAME]) {
2887 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2889 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2890 nf_ct_protonum(ct));
2895 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2896 helper, &tuple, &mask);
2898 return PTR_ERR(exp);
2900 err = nf_ct_expect_related_report(exp, portid, report, 0);
2901 nf_ct_expect_put(exp);
2905 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2906 enum ip_conntrack_info ctinfo, int diff)
2908 if (!(ct->status & IPS_NAT_MASK))
2911 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2914 static const struct nfnl_ct_hook ctnetlink_glue_hook = {
2915 .build_size = ctnetlink_glue_build_size,
2916 .build = ctnetlink_glue_build,
2917 .parse = ctnetlink_glue_parse,
2918 .attach_expect = ctnetlink_glue_attach_expect,
2919 .seq_adjust = ctnetlink_glue_seqadj,
2921 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2923 /***********************************************************************
2925 ***********************************************************************/
2927 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2928 const struct nf_conntrack_tuple *tuple,
2931 struct nlattr *nest_parms;
2933 nest_parms = nla_nest_start(skb, type);
2935 goto nla_put_failure;
2936 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2937 goto nla_put_failure;
2938 nla_nest_end(skb, nest_parms);
2946 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2947 const struct nf_conntrack_tuple *tuple,
2948 const struct nf_conntrack_tuple_mask *mask)
2950 const struct nf_conntrack_l4proto *l4proto;
2951 struct nf_conntrack_tuple m;
2952 struct nlattr *nest_parms;
2955 memset(&m, 0xFF, sizeof(m));
2956 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2957 m.src.u.all = mask->src.u.all;
2958 m.src.l3num = tuple->src.l3num;
2959 m.dst.protonum = tuple->dst.protonum;
2961 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2963 goto nla_put_failure;
2966 ret = ctnetlink_dump_tuples_ip(skb, &m);
2968 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2969 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2973 if (unlikely(ret < 0))
2974 goto nla_put_failure;
2976 nla_nest_end(skb, nest_parms);
2984 #if IS_ENABLED(CONFIG_NF_NAT)
2985 static const union nf_inet_addr any_addr;
2988 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2990 static siphash_aligned_key_t exp_id_seed;
2991 unsigned long a, b, c, d;
2993 net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
2995 a = (unsigned long)exp;
2996 b = (unsigned long)exp->helper;
2997 c = (unsigned long)exp->master;
2998 d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
3001 return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
3003 return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
3008 ctnetlink_exp_dump_expect(struct sk_buff *skb,
3009 const struct nf_conntrack_expect *exp)
3011 struct nf_conn *master = exp->master;
3012 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
3013 struct nf_conn_help *help;
3014 #if IS_ENABLED(CONFIG_NF_NAT)
3015 struct nlattr *nest_parms;
3016 struct nf_conntrack_tuple nat_tuple = {};
3018 struct nf_ct_helper_expectfn *expfn;
3023 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
3024 goto nla_put_failure;
3025 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
3026 goto nla_put_failure;
3027 if (ctnetlink_exp_dump_tuple(skb,
3028 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
3029 CTA_EXPECT_MASTER) < 0)
3030 goto nla_put_failure;
3032 #if IS_ENABLED(CONFIG_NF_NAT)
3033 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
3034 exp->saved_proto.all) {
3035 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
3037 goto nla_put_failure;
3039 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
3040 goto nla_put_failure;
3042 nat_tuple.src.l3num = nf_ct_l3num(master);
3043 nat_tuple.src.u3 = exp->saved_addr;
3044 nat_tuple.dst.protonum = nf_ct_protonum(master);
3045 nat_tuple.src.u = exp->saved_proto;
3047 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
3048 CTA_EXPECT_NAT_TUPLE) < 0)
3049 goto nla_put_failure;
3050 nla_nest_end(skb, nest_parms);
3053 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
3054 nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
3055 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
3056 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
3057 goto nla_put_failure;
3058 help = nfct_help(master);
3060 struct nf_conntrack_helper *helper;
3062 helper = rcu_dereference(help->helper);
3064 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
3065 goto nla_put_failure;
3067 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
3068 if (expfn != NULL &&
3069 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
3070 goto nla_put_failure;
3079 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
3080 int event, const struct nf_conntrack_expect *exp)
3082 struct nlmsghdr *nlh;
3083 unsigned int flags = portid ? NLM_F_MULTI : 0;
3085 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
3086 nlh = nfnl_msg_put(skb, portid, seq, event, flags,
3087 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3091 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3092 goto nla_put_failure;
3094 nlmsg_end(skb, nlh);
3099 nlmsg_cancel(skb, nlh);
3103 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3105 ctnetlink_expect_event(unsigned int events, const struct nf_exp_event *item)
3107 struct nf_conntrack_expect *exp = item->exp;
3108 struct net *net = nf_ct_exp_net(exp);
3109 struct nlmsghdr *nlh;
3110 struct sk_buff *skb;
3111 unsigned int type, group;
3114 if (events & (1 << IPEXP_DESTROY)) {
3115 type = IPCTNL_MSG_EXP_DELETE;
3116 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
3117 } else if (events & (1 << IPEXP_NEW)) {
3118 type = IPCTNL_MSG_EXP_NEW;
3119 flags = NLM_F_CREATE|NLM_F_EXCL;
3120 group = NFNLGRP_CONNTRACK_EXP_NEW;
3124 if (!item->report && !nfnetlink_has_listeners(net, group))
3127 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
3131 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
3132 nlh = nfnl_msg_put(skb, item->portid, 0, type, flags,
3133 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3137 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3138 goto nla_put_failure;
3140 nlmsg_end(skb, nlh);
3141 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
3145 nlmsg_cancel(skb, nlh);
3149 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
3153 static int ctnetlink_exp_done(struct netlink_callback *cb)
3156 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
3161 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3163 struct net *net = sock_net(skb->sk);
3164 struct nf_conntrack_expect *exp, *last;
3165 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3166 u_int8_t l3proto = nfmsg->nfgen_family;
3169 last = (struct nf_conntrack_expect *)cb->args[1];
3170 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
3172 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
3174 if (l3proto && exp->tuple.src.l3num != l3proto)
3177 if (!net_eq(nf_ct_net(exp->master), net))
3185 if (ctnetlink_exp_fill_info(skb,
3186 NETLINK_CB(cb->skb).portid,
3190 if (!refcount_inc_not_zero(&exp->use))
3192 cb->args[1] = (unsigned long)exp;
3204 nf_ct_expect_put(last);
3210 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3212 struct nf_conntrack_expect *exp, *last;
3213 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3214 struct nf_conn *ct = cb->data;
3215 struct nf_conn_help *help = nfct_help(ct);
3216 u_int8_t l3proto = nfmsg->nfgen_family;
3222 last = (struct nf_conntrack_expect *)cb->args[1];
3224 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
3225 if (l3proto && exp->tuple.src.l3num != l3proto)
3232 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
3236 if (!refcount_inc_not_zero(&exp->use))
3238 cb->args[1] = (unsigned long)exp;
3250 nf_ct_expect_put(last);
3255 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
3256 struct sk_buff *skb,
3257 const struct nlmsghdr *nlh,
3258 const struct nlattr * const cda[],
3259 struct netlink_ext_ack *extack)
3262 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3263 u_int8_t u3 = nfmsg->nfgen_family;
3264 struct nf_conntrack_tuple tuple;
3265 struct nf_conntrack_tuple_hash *h;
3267 struct nf_conntrack_zone zone;
3268 struct netlink_dump_control c = {
3269 .dump = ctnetlink_exp_ct_dump_table,
3270 .done = ctnetlink_exp_done,
3273 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3278 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3282 h = nf_conntrack_find_get(net, &zone, &tuple);
3286 ct = nf_ct_tuplehash_to_ctrack(h);
3287 /* No expectation linked to this connection tracking. */
3288 if (!nfct_help(ct)) {
3295 err = netlink_dump_start(ctnl, skb, nlh, &c);
3301 static int ctnetlink_get_expect(struct sk_buff *skb,
3302 const struct nfnl_info *info,
3303 const struct nlattr * const cda[])
3305 u_int8_t u3 = info->nfmsg->nfgen_family;
3306 struct nf_conntrack_tuple tuple;
3307 struct nf_conntrack_expect *exp;
3308 struct nf_conntrack_zone zone;
3309 struct sk_buff *skb2;
3312 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3313 if (cda[CTA_EXPECT_MASTER])
3314 return ctnetlink_dump_exp_ct(info->net, info->sk, skb,
3318 struct netlink_dump_control c = {
3319 .dump = ctnetlink_exp_dump_table,
3320 .done = ctnetlink_exp_done,
3322 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3326 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3330 if (cda[CTA_EXPECT_TUPLE])
3331 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3333 else if (cda[CTA_EXPECT_MASTER])
3334 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3342 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3346 if (cda[CTA_EXPECT_ID]) {
3347 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3349 if (id != nf_expect_get_id(exp)) {
3350 nf_ct_expect_put(exp);
3355 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3357 nf_ct_expect_put(exp);
3362 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3363 info->nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
3366 nf_ct_expect_put(exp);
3372 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
3375 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3377 struct nf_conntrack_helper *helper;
3378 const struct nf_conn_help *m_help;
3379 const char *name = data;
3381 m_help = nfct_help(exp->master);
3383 helper = rcu_dereference(m_help->helper);
3387 return strcmp(helper->name, name) == 0;
3390 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3395 static int ctnetlink_del_expect(struct sk_buff *skb,
3396 const struct nfnl_info *info,
3397 const struct nlattr * const cda[])
3399 u_int8_t u3 = info->nfmsg->nfgen_family;
3400 struct nf_conntrack_expect *exp;
3401 struct nf_conntrack_tuple tuple;
3402 struct nf_conntrack_zone zone;
3405 if (cda[CTA_EXPECT_TUPLE]) {
3406 /* delete a single expect by tuple */
3407 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3411 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3416 /* bump usage count to 2 */
3417 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3421 if (cda[CTA_EXPECT_ID]) {
3422 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3423 if (ntohl(id) != (u32)(unsigned long)exp) {
3424 nf_ct_expect_put(exp);
3429 /* after list removal, usage count == 1 */
3430 spin_lock_bh(&nf_conntrack_expect_lock);
3431 if (del_timer(&exp->timeout)) {
3432 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3433 nlmsg_report(info->nlh));
3434 nf_ct_expect_put(exp);
3436 spin_unlock_bh(&nf_conntrack_expect_lock);
3437 /* have to put what we 'get' above.
3438 * after this line usage count == 0 */
3439 nf_ct_expect_put(exp);
3440 } else if (cda[CTA_EXPECT_HELP_NAME]) {
3441 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3443 nf_ct_expect_iterate_net(info->net, expect_iter_name, name,
3444 NETLINK_CB(skb).portid,
3445 nlmsg_report(info->nlh));
3447 /* This basically means we have to flush everything*/
3448 nf_ct_expect_iterate_net(info->net, expect_iter_all, NULL,
3449 NETLINK_CB(skb).portid,
3450 nlmsg_report(info->nlh));
3456 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3457 const struct nlattr * const cda[])
3459 if (cda[CTA_EXPECT_TIMEOUT]) {
3460 if (!del_timer(&x->timeout))
3463 x->timeout.expires = jiffies +
3464 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3465 add_timer(&x->timeout);
3470 #if IS_ENABLED(CONFIG_NF_NAT)
3471 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3472 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3473 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3478 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3479 struct nf_conntrack_expect *exp,
3482 #if IS_ENABLED(CONFIG_NF_NAT)
3483 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3484 struct nf_conntrack_tuple nat_tuple = {};
3487 err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3488 exp_nat_nla_policy, NULL);
3492 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3495 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3496 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3501 exp->saved_addr = nat_tuple.src.u3;
3502 exp->saved_proto = nat_tuple.src.u;
3503 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3511 static struct nf_conntrack_expect *
3512 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3513 struct nf_conntrack_helper *helper,
3514 struct nf_conntrack_tuple *tuple,
3515 struct nf_conntrack_tuple *mask)
3517 u_int32_t class = 0;
3518 struct nf_conntrack_expect *exp;
3519 struct nf_conn_help *help;
3522 help = nfct_help(ct);
3524 return ERR_PTR(-EOPNOTSUPP);
3526 if (cda[CTA_EXPECT_CLASS] && helper) {
3527 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3528 if (class > helper->expect_class_max)
3529 return ERR_PTR(-EINVAL);
3531 exp = nf_ct_expect_alloc(ct);
3533 return ERR_PTR(-ENOMEM);
3535 if (cda[CTA_EXPECT_FLAGS]) {
3536 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3537 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3541 if (cda[CTA_EXPECT_FN]) {
3542 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3543 struct nf_ct_helper_expectfn *expfn;
3545 expfn = nf_ct_helper_expectfn_find_by_name(name);
3546 if (expfn == NULL) {
3550 exp->expectfn = expfn->expectfn;
3552 exp->expectfn = NULL;
3556 exp->helper = helper;
3557 exp->tuple = *tuple;
3558 exp->mask.src.u3 = mask->src.u3;
3559 exp->mask.src.u.all = mask->src.u.all;
3561 if (cda[CTA_EXPECT_NAT]) {
3562 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3563 exp, nf_ct_l3num(ct));
3569 nf_ct_expect_put(exp);
3570 return ERR_PTR(err);
3574 ctnetlink_create_expect(struct net *net,
3575 const struct nf_conntrack_zone *zone,
3576 const struct nlattr * const cda[],
3577 u_int8_t u3, u32 portid, int report)
3579 struct nf_conntrack_tuple tuple, mask, master_tuple;
3580 struct nf_conntrack_tuple_hash *h = NULL;
3581 struct nf_conntrack_helper *helper = NULL;
3582 struct nf_conntrack_expect *exp;
3586 /* caller guarantees that those three CTA_EXPECT_* exist */
3587 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3591 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3595 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3600 /* Look for master conntrack of this expectation */
3601 h = nf_conntrack_find_get(net, zone, &master_tuple);
3604 ct = nf_ct_tuplehash_to_ctrack(h);
3607 if (cda[CTA_EXPECT_HELP_NAME]) {
3608 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3610 helper = __nf_conntrack_helper_find(helpname, u3,
3611 nf_ct_protonum(ct));
3612 if (helper == NULL) {
3614 #ifdef CONFIG_MODULES
3615 if (request_module("nfct-helper-%s", helpname) < 0) {
3620 helper = __nf_conntrack_helper_find(helpname, u3,
3621 nf_ct_protonum(ct));
3633 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3639 err = nf_ct_expect_related_report(exp, portid, report, 0);
3640 nf_ct_expect_put(exp);
3648 static int ctnetlink_new_expect(struct sk_buff *skb,
3649 const struct nfnl_info *info,
3650 const struct nlattr * const cda[])
3652 u_int8_t u3 = info->nfmsg->nfgen_family;
3653 struct nf_conntrack_tuple tuple;
3654 struct nf_conntrack_expect *exp;
3655 struct nf_conntrack_zone zone;
3658 if (!cda[CTA_EXPECT_TUPLE]
3659 || !cda[CTA_EXPECT_MASK]
3660 || !cda[CTA_EXPECT_MASTER])
3663 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3667 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3672 spin_lock_bh(&nf_conntrack_expect_lock);
3673 exp = __nf_ct_expect_find(info->net, &zone, &tuple);
3675 spin_unlock_bh(&nf_conntrack_expect_lock);
3677 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
3678 err = ctnetlink_create_expect(info->net, &zone, cda, u3,
3679 NETLINK_CB(skb).portid,
3680 nlmsg_report(info->nlh));
3686 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL))
3687 err = ctnetlink_change_expect(exp, cda);
3688 spin_unlock_bh(&nf_conntrack_expect_lock);
3694 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3695 const struct ip_conntrack_stat *st)
3697 struct nlmsghdr *nlh;
3698 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3700 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3701 IPCTNL_MSG_EXP_GET_STATS_CPU);
3702 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
3703 NFNETLINK_V0, htons(cpu));
3707 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3708 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3709 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3710 goto nla_put_failure;
3712 nlmsg_end(skb, nlh);
3717 nlmsg_cancel(skb, nlh);
3722 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3725 struct net *net = sock_net(skb->sk);
3727 if (cb->args[0] == nr_cpu_ids)
3730 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3731 const struct ip_conntrack_stat *st;
3733 if (!cpu_possible(cpu))
3736 st = per_cpu_ptr(net->ct.stat, cpu);
3737 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3747 static int ctnetlink_stat_exp_cpu(struct sk_buff *skb,
3748 const struct nfnl_info *info,
3749 const struct nlattr * const cda[])
3751 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3752 struct netlink_dump_control c = {
3753 .dump = ctnetlink_exp_stat_cpu_dump,
3755 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3761 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3762 static struct nf_ct_event_notifier ctnl_notifier = {
3763 .ct_event = ctnetlink_conntrack_event,
3764 .exp_event = ctnetlink_expect_event,
3768 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3769 [IPCTNL_MSG_CT_NEW] = {
3770 .call = ctnetlink_new_conntrack,
3771 .type = NFNL_CB_MUTEX,
3772 .attr_count = CTA_MAX,
3773 .policy = ct_nla_policy
3775 [IPCTNL_MSG_CT_GET] = {
3776 .call = ctnetlink_get_conntrack,
3777 .type = NFNL_CB_MUTEX,
3778 .attr_count = CTA_MAX,
3779 .policy = ct_nla_policy
3781 [IPCTNL_MSG_CT_DELETE] = {
3782 .call = ctnetlink_del_conntrack,
3783 .type = NFNL_CB_MUTEX,
3784 .attr_count = CTA_MAX,
3785 .policy = ct_nla_policy
3787 [IPCTNL_MSG_CT_GET_CTRZERO] = {
3788 .call = ctnetlink_get_conntrack,
3789 .type = NFNL_CB_MUTEX,
3790 .attr_count = CTA_MAX,
3791 .policy = ct_nla_policy
3793 [IPCTNL_MSG_CT_GET_STATS_CPU] = {
3794 .call = ctnetlink_stat_ct_cpu,
3795 .type = NFNL_CB_MUTEX,
3797 [IPCTNL_MSG_CT_GET_STATS] = {
3798 .call = ctnetlink_stat_ct,
3799 .type = NFNL_CB_MUTEX,
3801 [IPCTNL_MSG_CT_GET_DYING] = {
3802 .call = ctnetlink_get_ct_dying,
3803 .type = NFNL_CB_MUTEX,
3805 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = {
3806 .call = ctnetlink_get_ct_unconfirmed,
3807 .type = NFNL_CB_MUTEX,
3811 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3812 [IPCTNL_MSG_EXP_GET] = {
3813 .call = ctnetlink_get_expect,
3814 .type = NFNL_CB_MUTEX,
3815 .attr_count = CTA_EXPECT_MAX,
3816 .policy = exp_nla_policy
3818 [IPCTNL_MSG_EXP_NEW] = {
3819 .call = ctnetlink_new_expect,
3820 .type = NFNL_CB_MUTEX,
3821 .attr_count = CTA_EXPECT_MAX,
3822 .policy = exp_nla_policy
3824 [IPCTNL_MSG_EXP_DELETE] = {
3825 .call = ctnetlink_del_expect,
3826 .type = NFNL_CB_MUTEX,
3827 .attr_count = CTA_EXPECT_MAX,
3828 .policy = exp_nla_policy
3830 [IPCTNL_MSG_EXP_GET_STATS_CPU] = {
3831 .call = ctnetlink_stat_exp_cpu,
3832 .type = NFNL_CB_MUTEX,
3836 static const struct nfnetlink_subsystem ctnl_subsys = {
3837 .name = "conntrack",
3838 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3839 .cb_count = IPCTNL_MSG_MAX,
3843 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3844 .name = "conntrack_expect",
3845 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3846 .cb_count = IPCTNL_MSG_EXP_MAX,
3850 MODULE_ALIAS("ip_conntrack_netlink");
3851 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3852 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3854 static int __net_init ctnetlink_net_init(struct net *net)
3856 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3857 nf_conntrack_register_notifier(net, &ctnl_notifier);
3862 static void ctnetlink_net_pre_exit(struct net *net)
3864 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3865 nf_conntrack_unregister_notifier(net);
3869 static struct pernet_operations ctnetlink_net_ops = {
3870 .init = ctnetlink_net_init,
3871 .pre_exit = ctnetlink_net_pre_exit,
3874 static int __init ctnetlink_init(void)
3878 NL_ASSERT_DUMP_CTX_FITS(struct ctnetlink_list_dump_ctx);
3880 ret = nfnetlink_subsys_register(&ctnl_subsys);
3882 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3886 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3888 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3889 goto err_unreg_subsys;
3892 ret = register_pernet_subsys(&ctnetlink_net_ops);
3894 pr_err("ctnetlink_init: cannot register pernet operations\n");
3895 goto err_unreg_exp_subsys;
3897 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3898 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3899 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3903 err_unreg_exp_subsys:
3904 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3906 nfnetlink_subsys_unregister(&ctnl_subsys);
3911 static void __exit ctnetlink_exit(void)
3913 unregister_pernet_subsys(&ctnetlink_net_ops);
3914 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3915 nfnetlink_subsys_unregister(&ctnl_subsys);
3916 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3917 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3922 module_init(ctnetlink_init);
3923 module_exit(ctnetlink_exit);