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(refcount_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->reply_flags);
1024 return ERR_PTR(err);
1027 static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
1029 return family || cda[CTA_MARK] || cda[CTA_FILTER] || cda[CTA_STATUS];
1032 static int ctnetlink_start(struct netlink_callback *cb)
1034 const struct nlattr * const *cda = cb->data;
1035 struct ctnetlink_filter *filter = NULL;
1036 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1037 u8 family = nfmsg->nfgen_family;
1039 if (ctnetlink_needs_filter(family, cda)) {
1040 filter = ctnetlink_alloc_filter(cda, family);
1042 return PTR_ERR(filter);
1049 static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
1050 struct nf_conntrack_tuple *ct_tuple,
1051 u_int32_t flags, int family)
1055 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1056 filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
1059 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1060 filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
1064 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1065 !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
1066 &ct_tuple->src.u3.in6))
1069 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1070 !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
1071 &ct_tuple->dst.u3.in6))
1076 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
1077 filter_tuple->dst.protonum != ct_tuple->dst.protonum)
1080 switch (ct_tuple->dst.protonum) {
1083 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
1084 filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
1087 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
1088 filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
1092 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
1093 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1095 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
1096 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1098 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
1099 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1102 case IPPROTO_ICMPV6:
1103 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
1104 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1106 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
1107 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1109 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
1110 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1118 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
1120 struct ctnetlink_filter *filter = data;
1121 struct nf_conntrack_tuple *tuple;
1127 /* Match entries of a given L3 protocol number.
1128 * If it is not specified, ie. l3proto == 0,
1129 * then match everything.
1131 if (filter->family && nf_ct_l3num(ct) != filter->family)
1134 if (filter->orig_flags) {
1135 tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
1136 if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
1142 if (filter->reply_flags) {
1143 tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
1144 if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
1145 filter->reply_flags,
1150 #ifdef CONFIG_NF_CONNTRACK_MARK
1151 if ((ct->mark & filter->mark.mask) != filter->mark.val)
1154 status = (u32)READ_ONCE(ct->status);
1155 if ((status & filter->status.mask) != filter->status.val)
1166 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1168 unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
1169 struct net *net = sock_net(skb->sk);
1170 struct nf_conn *ct, *last;
1171 struct nf_conntrack_tuple_hash *h;
1172 struct hlist_nulls_node *n;
1173 struct nf_conn *nf_ct_evict[8];
1177 last = (struct nf_conn *)cb->args[1];
1181 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
1185 if (nf_ct_should_gc(nf_ct_evict[i]))
1186 nf_ct_kill(nf_ct_evict[i]);
1187 nf_ct_put(nf_ct_evict[i]);
1190 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
1191 nf_conntrack_lock(lockp);
1192 if (cb->args[0] >= nf_conntrack_htable_size) {
1196 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
1198 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
1200 ct = nf_ct_tuplehash_to_ctrack(h);
1201 if (nf_ct_is_expired(ct)) {
1202 if (i < ARRAY_SIZE(nf_ct_evict) &&
1203 refcount_inc_not_zero(&ct->ct_general.use))
1204 nf_ct_evict[i++] = ct;
1208 if (!net_eq(net, nf_ct_net(ct)))
1216 if (!ctnetlink_filter_match(ct, cb->data))
1220 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1222 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1225 nf_conntrack_get(&ct->ct_general);
1226 cb->args[1] = (unsigned long)ct;
1240 /* nf ct hash resize happened, now clear the leftover. */
1241 if ((struct nf_conn *)cb->args[1] == last)
1249 if (nf_ct_should_gc(nf_ct_evict[i]))
1250 nf_ct_kill(nf_ct_evict[i]);
1251 nf_ct_put(nf_ct_evict[i]);
1257 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
1258 struct nf_conntrack_tuple *t,
1261 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1262 if (!tb[CTA_IP_V4_SRC])
1265 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1268 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1269 if (!tb[CTA_IP_V4_DST])
1272 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1278 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1279 struct nf_conntrack_tuple *t,
1282 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1283 if (!tb[CTA_IP_V6_SRC])
1286 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1289 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1290 if (!tb[CTA_IP_V6_DST])
1293 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1299 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1300 struct nf_conntrack_tuple *tuple,
1303 struct nlattr *tb[CTA_IP_MAX+1];
1306 ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
1310 ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
1311 cta_ip_nla_policy, NULL);
1315 switch (tuple->src.l3num) {
1317 ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
1320 ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
1327 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1328 [CTA_PROTO_NUM] = { .type = NLA_U8 },
1331 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1332 struct nf_conntrack_tuple *tuple,
1335 const struct nf_conntrack_l4proto *l4proto;
1336 struct nlattr *tb[CTA_PROTO_MAX+1];
1339 ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1340 proto_nla_policy, NULL);
1344 if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
1347 if (!tb[CTA_PROTO_NUM])
1350 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1353 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1355 if (likely(l4proto->nlattr_to_tuple)) {
1356 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1357 l4proto->nla_policy,
1360 ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
1369 ctnetlink_parse_zone(const struct nlattr *attr,
1370 struct nf_conntrack_zone *zone)
1372 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1373 NF_CT_DEFAULT_ZONE_DIR, 0);
1374 #ifdef CONFIG_NF_CONNTRACK_ZONES
1376 zone->id = ntohs(nla_get_be16(attr));
1385 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1386 struct nf_conntrack_zone *zone)
1390 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1393 ret = ctnetlink_parse_zone(attr, zone);
1397 if (type == CTA_TUPLE_REPLY)
1398 zone->dir = NF_CT_ZONE_DIR_REPL;
1400 zone->dir = NF_CT_ZONE_DIR_ORIG;
1405 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1406 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1407 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1408 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1411 #define CTA_FILTER_F_ALL_CTA_PROTO \
1412 (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
1413 CTA_FILTER_F_CTA_PROTO_DST_PORT | \
1414 CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
1415 CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
1416 CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
1417 CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
1418 CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
1419 CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
1422 ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
1423 struct nf_conntrack_tuple *tuple, u32 type,
1424 u_int8_t l3num, struct nf_conntrack_zone *zone,
1427 struct nlattr *tb[CTA_TUPLE_MAX+1];
1430 memset(tuple, 0, sizeof(*tuple));
1432 err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1433 tuple_nla_policy, NULL);
1437 if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1439 tuple->src.l3num = l3num;
1441 if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
1442 flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1443 if (!tb[CTA_TUPLE_IP])
1446 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
1451 if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
1452 if (!tb[CTA_TUPLE_PROTO])
1455 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
1458 } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
1459 /* Can't manage proto flags without a protonum */
1463 if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
1467 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1473 /* orig and expect tuples get DIR_ORIGINAL */
1474 if (type == CTA_TUPLE_REPLY)
1475 tuple->dst.dir = IP_CT_DIR_REPLY;
1477 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1483 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1484 struct nf_conntrack_tuple *tuple, u32 type,
1485 u_int8_t l3num, struct nf_conntrack_zone *zone)
1487 return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
1488 CTA_FILTER_FLAG(ALL));
1491 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1492 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1493 .len = NF_CT_HELPER_NAME_LEN - 1 },
1496 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1497 struct nlattr **helpinfo)
1500 struct nlattr *tb[CTA_HELP_MAX+1];
1502 err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1503 help_nla_policy, NULL);
1507 if (!tb[CTA_HELP_NAME])
1510 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1512 if (tb[CTA_HELP_INFO])
1513 *helpinfo = tb[CTA_HELP_INFO];
1518 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1519 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1520 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1521 [CTA_STATUS] = { .type = NLA_U32 },
1522 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1523 [CTA_HELP] = { .type = NLA_NESTED },
1524 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1525 [CTA_TIMEOUT] = { .type = NLA_U32 },
1526 [CTA_MARK] = { .type = NLA_U32 },
1527 [CTA_ID] = { .type = NLA_U32 },
1528 [CTA_NAT_DST] = { .type = NLA_NESTED },
1529 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1530 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1531 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1532 [CTA_ZONE] = { .type = NLA_U16 },
1533 [CTA_MARK_MASK] = { .type = NLA_U32 },
1534 [CTA_LABELS] = { .type = NLA_BINARY,
1535 .len = NF_CT_LABELS_MAX_SIZE },
1536 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1537 .len = NF_CT_LABELS_MAX_SIZE },
1538 [CTA_FILTER] = { .type = NLA_NESTED },
1539 [CTA_STATUS_MASK] = { .type = NLA_U32 },
1542 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1544 if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1547 return ctnetlink_filter_match(ct, data);
1550 static int ctnetlink_flush_conntrack(struct net *net,
1551 const struct nlattr * const cda[],
1552 u32 portid, int report, u8 family)
1554 struct ctnetlink_filter *filter = NULL;
1556 if (ctnetlink_needs_filter(family, cda)) {
1557 if (cda[CTA_FILTER])
1560 filter = ctnetlink_alloc_filter(cda, family);
1562 return PTR_ERR(filter);
1565 nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
1572 static int ctnetlink_del_conntrack(struct sk_buff *skb,
1573 const struct nfnl_info *info,
1574 const struct nlattr * const cda[])
1576 u8 family = info->nfmsg->nfgen_family;
1577 struct nf_conntrack_tuple_hash *h;
1578 struct nf_conntrack_tuple tuple;
1579 struct nf_conntrack_zone zone;
1583 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1587 if (cda[CTA_TUPLE_ORIG])
1588 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1590 else if (cda[CTA_TUPLE_REPLY])
1591 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1594 u_int8_t u3 = info->nfmsg->version ? family : AF_UNSPEC;
1596 return ctnetlink_flush_conntrack(info->net, cda,
1597 NETLINK_CB(skb).portid,
1598 nlmsg_report(info->nlh), u3);
1604 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1608 ct = nf_ct_tuplehash_to_ctrack(h);
1610 if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1616 __be32 id = nla_get_be32(cda[CTA_ID]);
1618 if (id != (__force __be32)nf_ct_get_id(ct)) {
1624 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(info->nlh));
1630 static int ctnetlink_get_conntrack(struct sk_buff *skb,
1631 const struct nfnl_info *info,
1632 const struct nlattr * const cda[])
1634 u_int8_t u3 = info->nfmsg->nfgen_family;
1635 struct nf_conntrack_tuple_hash *h;
1636 struct nf_conntrack_tuple tuple;
1637 struct nf_conntrack_zone zone;
1638 struct sk_buff *skb2;
1642 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1643 struct netlink_dump_control c = {
1644 .start = ctnetlink_start,
1645 .dump = ctnetlink_dump_table,
1646 .done = ctnetlink_done,
1647 .data = (void *)cda,
1650 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1653 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1657 if (cda[CTA_TUPLE_ORIG])
1658 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1660 else if (cda[CTA_TUPLE_REPLY])
1661 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1669 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1673 ct = nf_ct_tuplehash_to_ctrack(h);
1675 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1681 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid,
1682 info->nlh->nlmsg_seq,
1683 NFNL_MSG_TYPE(info->nlh->nlmsg_type), ct,
1691 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
1694 static int ctnetlink_done_list(struct netlink_callback *cb)
1697 nf_ct_put((struct nf_conn *)cb->args[1]);
1702 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1704 struct nf_conn *ct, *last;
1705 struct nf_conntrack_tuple_hash *h;
1706 struct hlist_nulls_node *n;
1707 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1708 u_int8_t l3proto = nfmsg->nfgen_family;
1711 struct hlist_nulls_head *list;
1712 struct net *net = sock_net(skb->sk);
1717 last = (struct nf_conn *)cb->args[1];
1719 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1720 struct ct_pcpu *pcpu;
1722 if (!cpu_possible(cpu))
1725 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1726 spin_lock_bh(&pcpu->lock);
1727 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1729 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1730 ct = nf_ct_tuplehash_to_ctrack(h);
1731 if (l3proto && nf_ct_l3num(ct) != l3proto)
1739 /* We can't dump extension info for the unconfirmed
1740 * list because unconfirmed conntracks can have
1741 * ct->ext reallocated (and thus freed).
1743 * In the dying list case ct->ext can't be free'd
1744 * until after we drop pcpu->lock.
1746 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1748 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1749 ct, dying ? true : false, 0);
1751 if (!refcount_inc_not_zero(&ct->ct_general.use))
1754 cb->args[1] = (unsigned long)ct;
1755 spin_unlock_bh(&pcpu->lock);
1763 spin_unlock_bh(&pcpu->lock);
1774 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1776 return ctnetlink_dump_list(skb, cb, true);
1779 static int ctnetlink_get_ct_dying(struct sk_buff *skb,
1780 const struct nfnl_info *info,
1781 const struct nlattr * const cda[])
1783 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1784 struct netlink_dump_control c = {
1785 .dump = ctnetlink_dump_dying,
1786 .done = ctnetlink_done_list,
1788 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1795 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1797 return ctnetlink_dump_list(skb, cb, false);
1800 static int ctnetlink_get_ct_unconfirmed(struct sk_buff *skb,
1801 const struct nfnl_info *info,
1802 const struct nlattr * const cda[])
1804 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1805 struct netlink_dump_control c = {
1806 .dump = ctnetlink_dump_unconfirmed,
1807 .done = ctnetlink_done_list,
1809 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1815 #if IS_ENABLED(CONFIG_NF_NAT)
1817 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1818 enum nf_nat_manip_type manip,
1819 const struct nlattr *attr)
1822 struct nf_nat_hook *nat_hook;
1825 nat_hook = rcu_dereference(nf_nat_hook);
1827 #ifdef CONFIG_MODULES
1829 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1830 if (request_module("nf-nat") < 0) {
1831 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1835 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1837 nat_hook = rcu_dereference(nf_nat_hook);
1844 err = nat_hook->parse_nat_setup(ct, manip, attr);
1845 if (err == -EAGAIN) {
1846 #ifdef CONFIG_MODULES
1848 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1849 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1850 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1854 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1865 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1870 /* Ignore these unchangable bits */
1871 on &= ~IPS_UNCHANGEABLE_MASK;
1872 off &= ~IPS_UNCHANGEABLE_MASK;
1874 for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1875 if (on & (1 << bit))
1876 set_bit(bit, &ct->status);
1877 else if (off & (1 << bit))
1878 clear_bit(bit, &ct->status);
1883 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1886 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1887 d = ct->status ^ status;
1889 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1893 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1894 /* SEEN_REPLY bit can only be set */
1897 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1898 /* ASSURED bit can only be set */
1901 __ctnetlink_change_status(ct, status, 0);
1906 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1908 #if IS_ENABLED(CONFIG_NF_NAT)
1911 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1914 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1919 return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1922 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1928 static int ctnetlink_change_helper(struct nf_conn *ct,
1929 const struct nlattr * const cda[])
1931 struct nf_conntrack_helper *helper;
1932 struct nf_conn_help *help = nfct_help(ct);
1933 char *helpname = NULL;
1934 struct nlattr *helpinfo = NULL;
1937 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1941 /* don't change helper of sibling connections */
1943 /* If we try to change the helper to the same thing twice,
1944 * treat the second attempt as a no-op instead of returning
1950 helper = rcu_dereference(help->helper);
1951 if (helper && !strcmp(helper->name, helpname))
1959 if (!strcmp(helpname, "")) {
1960 if (help && help->helper) {
1961 /* we had a helper before ... */
1962 nf_ct_remove_expectations(ct);
1963 RCU_INIT_POINTER(help->helper, NULL);
1970 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1971 nf_ct_protonum(ct));
1972 if (helper == NULL) {
1978 if (help->helper == helper) {
1979 /* update private helper data if allowed. */
1980 if (helper->from_nlattr)
1981 helper->from_nlattr(helpinfo, ct);
1986 /* we cannot set a helper for an existing conntrack */
1994 static int ctnetlink_change_timeout(struct nf_conn *ct,
1995 const struct nlattr * const cda[])
1997 u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1999 if (timeout > INT_MAX)
2001 WRITE_ONCE(ct->timeout, nfct_time_stamp + (u32)timeout);
2003 if (test_bit(IPS_DYING_BIT, &ct->status))
2009 #if defined(CONFIG_NF_CONNTRACK_MARK)
2010 static void ctnetlink_change_mark(struct nf_conn *ct,
2011 const struct nlattr * const cda[])
2013 u32 mark, newmark, mask = 0;
2015 if (cda[CTA_MARK_MASK])
2016 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2018 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2019 newmark = (ct->mark & mask) ^ mark;
2020 if (newmark != ct->mark)
2025 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
2026 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
2027 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
2028 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
2031 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
2032 const struct nlattr * const cda[])
2034 const struct nlattr *attr = cda[CTA_PROTOINFO];
2035 const struct nf_conntrack_l4proto *l4proto;
2036 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
2039 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
2040 protoinfo_policy, NULL);
2044 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
2045 if (l4proto->from_nlattr)
2046 err = l4proto->from_nlattr(tb, ct);
2051 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
2052 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
2053 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
2054 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
2057 static int change_seq_adj(struct nf_ct_seqadj *seq,
2058 const struct nlattr * const attr)
2061 struct nlattr *cda[CTA_SEQADJ_MAX+1];
2063 err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
2064 seqadj_policy, NULL);
2068 if (!cda[CTA_SEQADJ_CORRECTION_POS])
2071 seq->correction_pos =
2072 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
2074 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
2077 seq->offset_before =
2078 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
2080 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
2084 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
2090 ctnetlink_change_seq_adj(struct nf_conn *ct,
2091 const struct nlattr * const cda[])
2093 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
2099 spin_lock_bh(&ct->lock);
2100 if (cda[CTA_SEQ_ADJ_ORIG]) {
2101 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
2102 cda[CTA_SEQ_ADJ_ORIG]);
2106 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2109 if (cda[CTA_SEQ_ADJ_REPLY]) {
2110 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
2111 cda[CTA_SEQ_ADJ_REPLY]);
2115 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2118 spin_unlock_bh(&ct->lock);
2121 spin_unlock_bh(&ct->lock);
2125 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
2126 [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
2127 [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
2128 [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
2131 static int ctnetlink_change_synproxy(struct nf_conn *ct,
2132 const struct nlattr * const cda[])
2134 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
2135 struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
2141 err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
2142 cda[CTA_SYNPROXY], synproxy_policy,
2147 if (!tb[CTA_SYNPROXY_ISN] ||
2148 !tb[CTA_SYNPROXY_ITS] ||
2149 !tb[CTA_SYNPROXY_TSOFF])
2152 synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
2153 synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
2154 synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
2160 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
2162 #ifdef CONFIG_NF_CONNTRACK_LABELS
2163 size_t len = nla_len(cda[CTA_LABELS]);
2164 const void *mask = cda[CTA_LABELS_MASK];
2166 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
2170 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
2171 nla_len(cda[CTA_LABELS_MASK]) != len)
2173 mask = nla_data(cda[CTA_LABELS_MASK]);
2178 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
2185 ctnetlink_change_conntrack(struct nf_conn *ct,
2186 const struct nlattr * const cda[])
2190 /* only allow NAT changes and master assignation for new conntracks */
2191 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
2194 if (cda[CTA_HELP]) {
2195 err = ctnetlink_change_helper(ct, cda);
2200 if (cda[CTA_TIMEOUT]) {
2201 err = ctnetlink_change_timeout(ct, cda);
2206 if (cda[CTA_STATUS]) {
2207 err = ctnetlink_change_status(ct, cda);
2212 if (cda[CTA_PROTOINFO]) {
2213 err = ctnetlink_change_protoinfo(ct, cda);
2218 #if defined(CONFIG_NF_CONNTRACK_MARK)
2220 ctnetlink_change_mark(ct, cda);
2223 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2224 err = ctnetlink_change_seq_adj(ct, cda);
2229 if (cda[CTA_SYNPROXY]) {
2230 err = ctnetlink_change_synproxy(ct, cda);
2235 if (cda[CTA_LABELS]) {
2236 err = ctnetlink_attach_labels(ct, cda);
2244 static struct nf_conn *
2245 ctnetlink_create_conntrack(struct net *net,
2246 const struct nf_conntrack_zone *zone,
2247 const struct nlattr * const cda[],
2248 struct nf_conntrack_tuple *otuple,
2249 struct nf_conntrack_tuple *rtuple,
2254 struct nf_conntrack_helper *helper;
2255 struct nf_conn_tstamp *tstamp;
2258 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
2260 return ERR_PTR(-ENOMEM);
2262 if (!cda[CTA_TIMEOUT])
2265 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2266 if (timeout > INT_MAX)
2268 ct->timeout = (u32)timeout + nfct_time_stamp;
2271 if (cda[CTA_HELP]) {
2272 char *helpname = NULL;
2273 struct nlattr *helpinfo = NULL;
2275 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
2279 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2280 nf_ct_protonum(ct));
2281 if (helper == NULL) {
2283 #ifdef CONFIG_MODULES
2284 if (request_module("nfct-helper-%s", helpname) < 0) {
2290 helper = __nf_conntrack_helper_find(helpname,
2292 nf_ct_protonum(ct));
2302 struct nf_conn_help *help;
2304 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2309 /* set private helper data if allowed. */
2310 if (helper->from_nlattr)
2311 helper->from_nlattr(helpinfo, ct);
2313 /* disable helper auto-assignment for this entry */
2314 ct->status |= IPS_HELPER;
2315 RCU_INIT_POINTER(help->helper, helper);
2318 /* try an implicit helper assignation */
2319 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
2324 err = ctnetlink_setup_nat(ct, cda);
2328 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2329 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2330 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2331 nf_ct_labels_ext_add(ct);
2332 nfct_seqadj_ext_add(ct);
2333 nfct_synproxy_ext_add(ct);
2335 /* we must add conntrack extensions before confirmation. */
2336 ct->status |= IPS_CONFIRMED;
2338 if (cda[CTA_STATUS]) {
2339 err = ctnetlink_change_status(ct, cda);
2344 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2345 err = ctnetlink_change_seq_adj(ct, cda);
2350 memset(&ct->proto, 0, sizeof(ct->proto));
2351 if (cda[CTA_PROTOINFO]) {
2352 err = ctnetlink_change_protoinfo(ct, cda);
2357 if (cda[CTA_SYNPROXY]) {
2358 err = ctnetlink_change_synproxy(ct, cda);
2363 #if defined(CONFIG_NF_CONNTRACK_MARK)
2365 ctnetlink_change_mark(ct, cda);
2368 /* setup master conntrack: this is a confirmed expectation */
2369 if (cda[CTA_TUPLE_MASTER]) {
2370 struct nf_conntrack_tuple master;
2371 struct nf_conntrack_tuple_hash *master_h;
2372 struct nf_conn *master_ct;
2374 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2379 master_h = nf_conntrack_find_get(net, zone, &master);
2380 if (master_h == NULL) {
2384 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2385 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2386 ct->master = master_ct;
2388 tstamp = nf_conn_tstamp_find(ct);
2390 tstamp->start = ktime_get_real_ns();
2392 err = nf_conntrack_hash_check_insert(ct);
2403 nf_conntrack_free(ct);
2404 return ERR_PTR(err);
2407 static int ctnetlink_new_conntrack(struct sk_buff *skb,
2408 const struct nfnl_info *info,
2409 const struct nlattr * const cda[])
2411 struct nf_conntrack_tuple otuple, rtuple;
2412 struct nf_conntrack_tuple_hash *h = NULL;
2413 u_int8_t u3 = info->nfmsg->nfgen_family;
2414 struct nf_conntrack_zone zone;
2418 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2422 if (cda[CTA_TUPLE_ORIG]) {
2423 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2429 if (cda[CTA_TUPLE_REPLY]) {
2430 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2436 if (cda[CTA_TUPLE_ORIG])
2437 h = nf_conntrack_find_get(info->net, &zone, &otuple);
2438 else if (cda[CTA_TUPLE_REPLY])
2439 h = nf_conntrack_find_get(info->net, &zone, &rtuple);
2443 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
2444 enum ip_conntrack_events events;
2446 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2448 if (otuple.dst.protonum != rtuple.dst.protonum)
2451 ct = ctnetlink_create_conntrack(info->net, &zone, cda,
2452 &otuple, &rtuple, u3);
2457 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2458 events = 1 << IPCT_RELATED;
2460 events = 1 << IPCT_NEW;
2462 if (cda[CTA_LABELS] &&
2463 ctnetlink_attach_labels(ct, cda) == 0)
2464 events |= (1 << IPCT_LABEL);
2466 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2467 (1 << IPCT_ASSURED) |
2468 (1 << IPCT_HELPER) |
2469 (1 << IPCT_PROTOINFO) |
2470 (1 << IPCT_SEQADJ) |
2472 (1 << IPCT_SYNPROXY) |
2474 ct, NETLINK_CB(skb).portid,
2475 nlmsg_report(info->nlh));
2481 /* implicit 'else' */
2484 ct = nf_ct_tuplehash_to_ctrack(h);
2485 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL)) {
2486 err = ctnetlink_change_conntrack(ct, cda);
2488 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2489 (1 << IPCT_ASSURED) |
2490 (1 << IPCT_HELPER) |
2492 (1 << IPCT_PROTOINFO) |
2493 (1 << IPCT_SEQADJ) |
2495 (1 << IPCT_SYNPROXY),
2496 ct, NETLINK_CB(skb).portid,
2497 nlmsg_report(info->nlh));
2506 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2507 __u16 cpu, const struct ip_conntrack_stat *st)
2509 struct nlmsghdr *nlh;
2510 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2512 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2513 IPCTNL_MSG_CT_GET_STATS_CPU);
2514 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2515 NFNETLINK_V0, htons(cpu));
2519 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2520 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2521 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2522 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2523 htonl(st->insert_failed)) ||
2524 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2525 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2526 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2527 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2528 htonl(st->search_restart)) ||
2529 nla_put_be32(skb, CTA_STATS_CLASH_RESOLVE,
2530 htonl(st->clash_resolve)) ||
2531 nla_put_be32(skb, CTA_STATS_CHAIN_TOOLONG,
2532 htonl(st->chaintoolong)))
2533 goto nla_put_failure;
2535 nlmsg_end(skb, nlh);
2540 nlmsg_cancel(skb, nlh);
2545 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2548 struct net *net = sock_net(skb->sk);
2550 if (cb->args[0] == nr_cpu_ids)
2553 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2554 const struct ip_conntrack_stat *st;
2556 if (!cpu_possible(cpu))
2559 st = per_cpu_ptr(net->ct.stat, cpu);
2560 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2561 NETLINK_CB(cb->skb).portid,
2571 static int ctnetlink_stat_ct_cpu(struct sk_buff *skb,
2572 const struct nfnl_info *info,
2573 const struct nlattr * const cda[])
2575 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
2576 struct netlink_dump_control c = {
2577 .dump = ctnetlink_ct_stat_cpu_dump,
2579 return netlink_dump_start(info->sk, skb, info->nlh, &c);
2586 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2589 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2590 unsigned int nr_conntracks;
2591 struct nlmsghdr *nlh;
2593 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2594 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2599 nr_conntracks = nf_conntrack_count(net);
2600 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2601 goto nla_put_failure;
2603 if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2604 goto nla_put_failure;
2606 nlmsg_end(skb, nlh);
2611 nlmsg_cancel(skb, nlh);
2615 static int ctnetlink_stat_ct(struct sk_buff *skb, const struct nfnl_info *info,
2616 const struct nlattr * const cda[])
2618 struct sk_buff *skb2;
2621 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2625 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2626 info->nlh->nlmsg_seq,
2627 NFNL_MSG_TYPE(info->nlh->nlmsg_type),
2634 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
2637 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2638 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2639 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2640 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2641 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2642 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2643 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2644 .len = NF_CT_HELPER_NAME_LEN - 1 },
2645 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2646 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2647 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2648 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2649 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2652 static struct nf_conntrack_expect *
2653 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2654 struct nf_conntrack_helper *helper,
2655 struct nf_conntrack_tuple *tuple,
2656 struct nf_conntrack_tuple *mask);
2658 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2660 ctnetlink_glue_build_size(const struct nf_conn *ct)
2662 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2663 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2664 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2665 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2666 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2667 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2668 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2669 + nla_total_size(0) /* CTA_PROTOINFO */
2670 + nla_total_size(0) /* CTA_HELP */
2671 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2672 + ctnetlink_secctx_size(ct)
2673 + ctnetlink_acct_size(ct)
2674 + ctnetlink_timestamp_size(ct)
2675 #if IS_ENABLED(CONFIG_NF_NAT)
2676 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2677 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2679 #ifdef CONFIG_NF_CONNTRACK_MARK
2680 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2682 #ifdef CONFIG_NF_CONNTRACK_ZONES
2683 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2685 + ctnetlink_proto_size(ct)
2689 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2691 const struct nf_conntrack_zone *zone;
2692 struct nlattr *nest_parms;
2694 zone = nf_ct_zone(ct);
2696 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2698 goto nla_put_failure;
2699 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2700 goto nla_put_failure;
2701 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2702 NF_CT_ZONE_DIR_ORIG) < 0)
2703 goto nla_put_failure;
2704 nla_nest_end(skb, nest_parms);
2706 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2708 goto nla_put_failure;
2709 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2710 goto nla_put_failure;
2711 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2712 NF_CT_ZONE_DIR_REPL) < 0)
2713 goto nla_put_failure;
2714 nla_nest_end(skb, nest_parms);
2716 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2717 NF_CT_DEFAULT_ZONE_DIR) < 0)
2718 goto nla_put_failure;
2720 if (ctnetlink_dump_id(skb, ct) < 0)
2721 goto nla_put_failure;
2723 if (ctnetlink_dump_status(skb, ct) < 0)
2724 goto nla_put_failure;
2726 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
2727 goto nla_put_failure;
2729 if (ctnetlink_dump_protoinfo(skb, ct, false) < 0)
2730 goto nla_put_failure;
2732 if (ctnetlink_dump_acct(skb, ct, IPCTNL_MSG_CT_GET) < 0 ||
2733 ctnetlink_dump_timestamp(skb, ct) < 0)
2734 goto nla_put_failure;
2736 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2737 goto nla_put_failure;
2739 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2740 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2741 goto nla_put_failure;
2743 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2744 goto nla_put_failure;
2746 if ((ct->status & IPS_SEQ_ADJUST) &&
2747 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2748 goto nla_put_failure;
2750 if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2751 goto nla_put_failure;
2753 #ifdef CONFIG_NF_CONNTRACK_MARK
2754 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2755 goto nla_put_failure;
2757 if (ctnetlink_dump_labels(skb, ct) < 0)
2758 goto nla_put_failure;
2766 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2767 enum ip_conntrack_info ctinfo,
2768 u_int16_t ct_attr, u_int16_t ct_info_attr)
2770 struct nlattr *nest_parms;
2772 nest_parms = nla_nest_start(skb, ct_attr);
2774 goto nla_put_failure;
2776 if (__ctnetlink_glue_build(skb, ct) < 0)
2777 goto nla_put_failure;
2779 nla_nest_end(skb, nest_parms);
2781 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2782 goto nla_put_failure;
2791 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2793 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2794 unsigned long d = ct->status ^ status;
2796 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2797 /* SEEN_REPLY bit can only be set */
2800 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2801 /* ASSURED bit can only be set */
2804 /* This check is less strict than ctnetlink_change_status()
2805 * because callers often flip IPS_EXPECTED bits when sending
2806 * an NFQA_CT attribute to the kernel. So ignore the
2807 * unchangeable bits but do not error out. Also user programs
2808 * are allowed to clear the bits that they are allowed to change.
2810 __ctnetlink_change_status(ct, status, ~status);
2815 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2819 if (cda[CTA_TIMEOUT]) {
2820 err = ctnetlink_change_timeout(ct, cda);
2824 if (cda[CTA_STATUS]) {
2825 err = ctnetlink_update_status(ct, cda);
2829 if (cda[CTA_HELP]) {
2830 err = ctnetlink_change_helper(ct, cda);
2834 if (cda[CTA_LABELS]) {
2835 err = ctnetlink_attach_labels(ct, cda);
2839 #if defined(CONFIG_NF_CONNTRACK_MARK)
2840 if (cda[CTA_MARK]) {
2841 ctnetlink_change_mark(ct, cda);
2848 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2850 struct nlattr *cda[CTA_MAX+1];
2853 ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2858 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2861 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2862 const struct nf_conn *ct,
2863 struct nf_conntrack_tuple *tuple,
2864 struct nf_conntrack_tuple *mask)
2868 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2869 nf_ct_l3num(ct), NULL);
2873 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2874 nf_ct_l3num(ct), NULL);
2878 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2879 u32 portid, u32 report)
2881 struct nlattr *cda[CTA_EXPECT_MAX+1];
2882 struct nf_conntrack_tuple tuple, mask;
2883 struct nf_conntrack_helper *helper = NULL;
2884 struct nf_conntrack_expect *exp;
2887 err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2888 exp_nla_policy, NULL);
2892 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2897 if (cda[CTA_EXPECT_HELP_NAME]) {
2898 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2900 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2901 nf_ct_protonum(ct));
2906 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2907 helper, &tuple, &mask);
2909 return PTR_ERR(exp);
2911 err = nf_ct_expect_related_report(exp, portid, report, 0);
2912 nf_ct_expect_put(exp);
2916 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2917 enum ip_conntrack_info ctinfo, int diff)
2919 if (!(ct->status & IPS_NAT_MASK))
2922 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2925 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2926 .build_size = ctnetlink_glue_build_size,
2927 .build = ctnetlink_glue_build,
2928 .parse = ctnetlink_glue_parse,
2929 .attach_expect = ctnetlink_glue_attach_expect,
2930 .seq_adjust = ctnetlink_glue_seqadj,
2932 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2934 /***********************************************************************
2936 ***********************************************************************/
2938 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2939 const struct nf_conntrack_tuple *tuple,
2942 struct nlattr *nest_parms;
2944 nest_parms = nla_nest_start(skb, type);
2946 goto nla_put_failure;
2947 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2948 goto nla_put_failure;
2949 nla_nest_end(skb, nest_parms);
2957 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2958 const struct nf_conntrack_tuple *tuple,
2959 const struct nf_conntrack_tuple_mask *mask)
2961 const struct nf_conntrack_l4proto *l4proto;
2962 struct nf_conntrack_tuple m;
2963 struct nlattr *nest_parms;
2966 memset(&m, 0xFF, sizeof(m));
2967 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2968 m.src.u.all = mask->src.u.all;
2969 m.src.l3num = tuple->src.l3num;
2970 m.dst.protonum = tuple->dst.protonum;
2972 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2974 goto nla_put_failure;
2977 ret = ctnetlink_dump_tuples_ip(skb, &m);
2979 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2980 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2984 if (unlikely(ret < 0))
2985 goto nla_put_failure;
2987 nla_nest_end(skb, nest_parms);
2995 static const union nf_inet_addr any_addr;
2997 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2999 static __read_mostly siphash_key_t exp_id_seed;
3000 unsigned long a, b, c, d;
3002 net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
3004 a = (unsigned long)exp;
3005 b = (unsigned long)exp->helper;
3006 c = (unsigned long)exp->master;
3007 d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
3010 return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
3012 return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
3017 ctnetlink_exp_dump_expect(struct sk_buff *skb,
3018 const struct nf_conntrack_expect *exp)
3020 struct nf_conn *master = exp->master;
3021 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
3022 struct nf_conn_help *help;
3023 #if IS_ENABLED(CONFIG_NF_NAT)
3024 struct nlattr *nest_parms;
3025 struct nf_conntrack_tuple nat_tuple = {};
3027 struct nf_ct_helper_expectfn *expfn;
3032 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
3033 goto nla_put_failure;
3034 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
3035 goto nla_put_failure;
3036 if (ctnetlink_exp_dump_tuple(skb,
3037 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
3038 CTA_EXPECT_MASTER) < 0)
3039 goto nla_put_failure;
3041 #if IS_ENABLED(CONFIG_NF_NAT)
3042 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
3043 exp->saved_proto.all) {
3044 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
3046 goto nla_put_failure;
3048 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
3049 goto nla_put_failure;
3051 nat_tuple.src.l3num = nf_ct_l3num(master);
3052 nat_tuple.src.u3 = exp->saved_addr;
3053 nat_tuple.dst.protonum = nf_ct_protonum(master);
3054 nat_tuple.src.u = exp->saved_proto;
3056 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
3057 CTA_EXPECT_NAT_TUPLE) < 0)
3058 goto nla_put_failure;
3059 nla_nest_end(skb, nest_parms);
3062 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
3063 nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
3064 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
3065 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
3066 goto nla_put_failure;
3067 help = nfct_help(master);
3069 struct nf_conntrack_helper *helper;
3071 helper = rcu_dereference(help->helper);
3073 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
3074 goto nla_put_failure;
3076 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
3077 if (expfn != NULL &&
3078 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
3079 goto nla_put_failure;
3088 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
3089 int event, const struct nf_conntrack_expect *exp)
3091 struct nlmsghdr *nlh;
3092 unsigned int flags = portid ? NLM_F_MULTI : 0;
3094 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
3095 nlh = nfnl_msg_put(skb, portid, seq, event, flags,
3096 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3100 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3101 goto nla_put_failure;
3103 nlmsg_end(skb, nlh);
3108 nlmsg_cancel(skb, nlh);
3112 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3114 ctnetlink_expect_event(unsigned int events, const struct nf_exp_event *item)
3116 struct nf_conntrack_expect *exp = item->exp;
3117 struct net *net = nf_ct_exp_net(exp);
3118 struct nlmsghdr *nlh;
3119 struct sk_buff *skb;
3120 unsigned int type, group;
3123 if (events & (1 << IPEXP_DESTROY)) {
3124 type = IPCTNL_MSG_EXP_DELETE;
3125 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
3126 } else if (events & (1 << IPEXP_NEW)) {
3127 type = IPCTNL_MSG_EXP_NEW;
3128 flags = NLM_F_CREATE|NLM_F_EXCL;
3129 group = NFNLGRP_CONNTRACK_EXP_NEW;
3133 if (!item->report && !nfnetlink_has_listeners(net, group))
3136 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
3140 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
3141 nlh = nfnl_msg_put(skb, item->portid, 0, type, flags,
3142 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3146 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3147 goto nla_put_failure;
3149 nlmsg_end(skb, nlh);
3150 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
3154 nlmsg_cancel(skb, nlh);
3158 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
3162 static int ctnetlink_exp_done(struct netlink_callback *cb)
3165 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
3170 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3172 struct net *net = sock_net(skb->sk);
3173 struct nf_conntrack_expect *exp, *last;
3174 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3175 u_int8_t l3proto = nfmsg->nfgen_family;
3178 last = (struct nf_conntrack_expect *)cb->args[1];
3179 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
3181 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
3183 if (l3proto && exp->tuple.src.l3num != l3proto)
3186 if (!net_eq(nf_ct_net(exp->master), net))
3194 if (ctnetlink_exp_fill_info(skb,
3195 NETLINK_CB(cb->skb).portid,
3199 if (!refcount_inc_not_zero(&exp->use))
3201 cb->args[1] = (unsigned long)exp;
3213 nf_ct_expect_put(last);
3219 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3221 struct nf_conntrack_expect *exp, *last;
3222 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3223 struct nf_conn *ct = cb->data;
3224 struct nf_conn_help *help = nfct_help(ct);
3225 u_int8_t l3proto = nfmsg->nfgen_family;
3231 last = (struct nf_conntrack_expect *)cb->args[1];
3233 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
3234 if (l3proto && exp->tuple.src.l3num != l3proto)
3241 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
3245 if (!refcount_inc_not_zero(&exp->use))
3247 cb->args[1] = (unsigned long)exp;
3259 nf_ct_expect_put(last);
3264 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
3265 struct sk_buff *skb,
3266 const struct nlmsghdr *nlh,
3267 const struct nlattr * const cda[],
3268 struct netlink_ext_ack *extack)
3271 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3272 u_int8_t u3 = nfmsg->nfgen_family;
3273 struct nf_conntrack_tuple tuple;
3274 struct nf_conntrack_tuple_hash *h;
3276 struct nf_conntrack_zone zone;
3277 struct netlink_dump_control c = {
3278 .dump = ctnetlink_exp_ct_dump_table,
3279 .done = ctnetlink_exp_done,
3282 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3287 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3291 h = nf_conntrack_find_get(net, &zone, &tuple);
3295 ct = nf_ct_tuplehash_to_ctrack(h);
3296 /* No expectation linked to this connection tracking. */
3297 if (!nfct_help(ct)) {
3304 err = netlink_dump_start(ctnl, skb, nlh, &c);
3310 static int ctnetlink_get_expect(struct sk_buff *skb,
3311 const struct nfnl_info *info,
3312 const struct nlattr * const cda[])
3314 u_int8_t u3 = info->nfmsg->nfgen_family;
3315 struct nf_conntrack_tuple tuple;
3316 struct nf_conntrack_expect *exp;
3317 struct nf_conntrack_zone zone;
3318 struct sk_buff *skb2;
3321 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3322 if (cda[CTA_EXPECT_MASTER])
3323 return ctnetlink_dump_exp_ct(info->net, info->sk, skb,
3327 struct netlink_dump_control c = {
3328 .dump = ctnetlink_exp_dump_table,
3329 .done = ctnetlink_exp_done,
3331 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3335 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3339 if (cda[CTA_EXPECT_TUPLE])
3340 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3342 else if (cda[CTA_EXPECT_MASTER])
3343 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3351 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3355 if (cda[CTA_EXPECT_ID]) {
3356 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3358 if (id != nf_expect_get_id(exp)) {
3359 nf_ct_expect_put(exp);
3364 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3366 nf_ct_expect_put(exp);
3371 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3372 info->nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
3375 nf_ct_expect_put(exp);
3381 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
3384 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3386 const struct nf_conn_help *m_help;
3387 const char *name = data;
3389 m_help = nfct_help(exp->master);
3391 return strcmp(m_help->helper->name, name) == 0;
3394 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3399 static int ctnetlink_del_expect(struct sk_buff *skb,
3400 const struct nfnl_info *info,
3401 const struct nlattr * const cda[])
3403 u_int8_t u3 = info->nfmsg->nfgen_family;
3404 struct nf_conntrack_expect *exp;
3405 struct nf_conntrack_tuple tuple;
3406 struct nf_conntrack_zone zone;
3409 if (cda[CTA_EXPECT_TUPLE]) {
3410 /* delete a single expect by tuple */
3411 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3415 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3420 /* bump usage count to 2 */
3421 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3425 if (cda[CTA_EXPECT_ID]) {
3426 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3427 if (ntohl(id) != (u32)(unsigned long)exp) {
3428 nf_ct_expect_put(exp);
3433 /* after list removal, usage count == 1 */
3434 spin_lock_bh(&nf_conntrack_expect_lock);
3435 if (del_timer(&exp->timeout)) {
3436 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3437 nlmsg_report(info->nlh));
3438 nf_ct_expect_put(exp);
3440 spin_unlock_bh(&nf_conntrack_expect_lock);
3441 /* have to put what we 'get' above.
3442 * after this line usage count == 0 */
3443 nf_ct_expect_put(exp);
3444 } else if (cda[CTA_EXPECT_HELP_NAME]) {
3445 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3447 nf_ct_expect_iterate_net(info->net, expect_iter_name, name,
3448 NETLINK_CB(skb).portid,
3449 nlmsg_report(info->nlh));
3451 /* This basically means we have to flush everything*/
3452 nf_ct_expect_iterate_net(info->net, expect_iter_all, NULL,
3453 NETLINK_CB(skb).portid,
3454 nlmsg_report(info->nlh));
3460 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3461 const struct nlattr * const cda[])
3463 if (cda[CTA_EXPECT_TIMEOUT]) {
3464 if (!del_timer(&x->timeout))
3467 x->timeout.expires = jiffies +
3468 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3469 add_timer(&x->timeout);
3474 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3475 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3476 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3480 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3481 struct nf_conntrack_expect *exp,
3484 #if IS_ENABLED(CONFIG_NF_NAT)
3485 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3486 struct nf_conntrack_tuple nat_tuple = {};
3489 err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3490 exp_nat_nla_policy, NULL);
3494 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3497 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3498 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3503 exp->saved_addr = nat_tuple.src.u3;
3504 exp->saved_proto = nat_tuple.src.u;
3505 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3513 static struct nf_conntrack_expect *
3514 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3515 struct nf_conntrack_helper *helper,
3516 struct nf_conntrack_tuple *tuple,
3517 struct nf_conntrack_tuple *mask)
3519 u_int32_t class = 0;
3520 struct nf_conntrack_expect *exp;
3521 struct nf_conn_help *help;
3524 help = nfct_help(ct);
3526 return ERR_PTR(-EOPNOTSUPP);
3528 if (cda[CTA_EXPECT_CLASS] && helper) {
3529 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3530 if (class > helper->expect_class_max)
3531 return ERR_PTR(-EINVAL);
3533 exp = nf_ct_expect_alloc(ct);
3535 return ERR_PTR(-ENOMEM);
3537 if (cda[CTA_EXPECT_FLAGS]) {
3538 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3539 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3543 if (cda[CTA_EXPECT_FN]) {
3544 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3545 struct nf_ct_helper_expectfn *expfn;
3547 expfn = nf_ct_helper_expectfn_find_by_name(name);
3548 if (expfn == NULL) {
3552 exp->expectfn = expfn->expectfn;
3554 exp->expectfn = NULL;
3558 exp->helper = helper;
3559 exp->tuple = *tuple;
3560 exp->mask.src.u3 = mask->src.u3;
3561 exp->mask.src.u.all = mask->src.u.all;
3563 if (cda[CTA_EXPECT_NAT]) {
3564 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3565 exp, nf_ct_l3num(ct));
3571 nf_ct_expect_put(exp);
3572 return ERR_PTR(err);
3576 ctnetlink_create_expect(struct net *net,
3577 const struct nf_conntrack_zone *zone,
3578 const struct nlattr * const cda[],
3579 u_int8_t u3, u32 portid, int report)
3581 struct nf_conntrack_tuple tuple, mask, master_tuple;
3582 struct nf_conntrack_tuple_hash *h = NULL;
3583 struct nf_conntrack_helper *helper = NULL;
3584 struct nf_conntrack_expect *exp;
3588 /* caller guarantees that those three CTA_EXPECT_* exist */
3589 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3593 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3597 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3602 /* Look for master conntrack of this expectation */
3603 h = nf_conntrack_find_get(net, zone, &master_tuple);
3606 ct = nf_ct_tuplehash_to_ctrack(h);
3609 if (cda[CTA_EXPECT_HELP_NAME]) {
3610 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3612 helper = __nf_conntrack_helper_find(helpname, u3,
3613 nf_ct_protonum(ct));
3614 if (helper == NULL) {
3616 #ifdef CONFIG_MODULES
3617 if (request_module("nfct-helper-%s", helpname) < 0) {
3622 helper = __nf_conntrack_helper_find(helpname, u3,
3623 nf_ct_protonum(ct));
3635 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3641 err = nf_ct_expect_related_report(exp, portid, report, 0);
3642 nf_ct_expect_put(exp);
3650 static int ctnetlink_new_expect(struct sk_buff *skb,
3651 const struct nfnl_info *info,
3652 const struct nlattr * const cda[])
3654 u_int8_t u3 = info->nfmsg->nfgen_family;
3655 struct nf_conntrack_tuple tuple;
3656 struct nf_conntrack_expect *exp;
3657 struct nf_conntrack_zone zone;
3660 if (!cda[CTA_EXPECT_TUPLE]
3661 || !cda[CTA_EXPECT_MASK]
3662 || !cda[CTA_EXPECT_MASTER])
3665 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3669 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3674 spin_lock_bh(&nf_conntrack_expect_lock);
3675 exp = __nf_ct_expect_find(info->net, &zone, &tuple);
3677 spin_unlock_bh(&nf_conntrack_expect_lock);
3679 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
3680 err = ctnetlink_create_expect(info->net, &zone, cda, u3,
3681 NETLINK_CB(skb).portid,
3682 nlmsg_report(info->nlh));
3688 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL))
3689 err = ctnetlink_change_expect(exp, cda);
3690 spin_unlock_bh(&nf_conntrack_expect_lock);
3696 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3697 const struct ip_conntrack_stat *st)
3699 struct nlmsghdr *nlh;
3700 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3702 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3703 IPCTNL_MSG_EXP_GET_STATS_CPU);
3704 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
3705 NFNETLINK_V0, htons(cpu));
3709 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3710 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3711 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3712 goto nla_put_failure;
3714 nlmsg_end(skb, nlh);
3719 nlmsg_cancel(skb, nlh);
3724 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3727 struct net *net = sock_net(skb->sk);
3729 if (cb->args[0] == nr_cpu_ids)
3732 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3733 const struct ip_conntrack_stat *st;
3735 if (!cpu_possible(cpu))
3738 st = per_cpu_ptr(net->ct.stat, cpu);
3739 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3749 static int ctnetlink_stat_exp_cpu(struct sk_buff *skb,
3750 const struct nfnl_info *info,
3751 const struct nlattr * const cda[])
3753 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3754 struct netlink_dump_control c = {
3755 .dump = ctnetlink_exp_stat_cpu_dump,
3757 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3763 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3764 static struct nf_ct_event_notifier ctnl_notifier = {
3765 .ct_event = ctnetlink_conntrack_event,
3766 .exp_event = ctnetlink_expect_event,
3770 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3771 [IPCTNL_MSG_CT_NEW] = {
3772 .call = ctnetlink_new_conntrack,
3773 .type = NFNL_CB_MUTEX,
3774 .attr_count = CTA_MAX,
3775 .policy = ct_nla_policy
3777 [IPCTNL_MSG_CT_GET] = {
3778 .call = ctnetlink_get_conntrack,
3779 .type = NFNL_CB_MUTEX,
3780 .attr_count = CTA_MAX,
3781 .policy = ct_nla_policy
3783 [IPCTNL_MSG_CT_DELETE] = {
3784 .call = ctnetlink_del_conntrack,
3785 .type = NFNL_CB_MUTEX,
3786 .attr_count = CTA_MAX,
3787 .policy = ct_nla_policy
3789 [IPCTNL_MSG_CT_GET_CTRZERO] = {
3790 .call = ctnetlink_get_conntrack,
3791 .type = NFNL_CB_MUTEX,
3792 .attr_count = CTA_MAX,
3793 .policy = ct_nla_policy
3795 [IPCTNL_MSG_CT_GET_STATS_CPU] = {
3796 .call = ctnetlink_stat_ct_cpu,
3797 .type = NFNL_CB_MUTEX,
3799 [IPCTNL_MSG_CT_GET_STATS] = {
3800 .call = ctnetlink_stat_ct,
3801 .type = NFNL_CB_MUTEX,
3803 [IPCTNL_MSG_CT_GET_DYING] = {
3804 .call = ctnetlink_get_ct_dying,
3805 .type = NFNL_CB_MUTEX,
3807 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = {
3808 .call = ctnetlink_get_ct_unconfirmed,
3809 .type = NFNL_CB_MUTEX,
3813 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3814 [IPCTNL_MSG_EXP_GET] = {
3815 .call = ctnetlink_get_expect,
3816 .type = NFNL_CB_MUTEX,
3817 .attr_count = CTA_EXPECT_MAX,
3818 .policy = exp_nla_policy
3820 [IPCTNL_MSG_EXP_NEW] = {
3821 .call = ctnetlink_new_expect,
3822 .type = NFNL_CB_MUTEX,
3823 .attr_count = CTA_EXPECT_MAX,
3824 .policy = exp_nla_policy
3826 [IPCTNL_MSG_EXP_DELETE] = {
3827 .call = ctnetlink_del_expect,
3828 .type = NFNL_CB_MUTEX,
3829 .attr_count = CTA_EXPECT_MAX,
3830 .policy = exp_nla_policy
3832 [IPCTNL_MSG_EXP_GET_STATS_CPU] = {
3833 .call = ctnetlink_stat_exp_cpu,
3834 .type = NFNL_CB_MUTEX,
3838 static const struct nfnetlink_subsystem ctnl_subsys = {
3839 .name = "conntrack",
3840 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3841 .cb_count = IPCTNL_MSG_MAX,
3845 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3846 .name = "conntrack_expect",
3847 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3848 .cb_count = IPCTNL_MSG_EXP_MAX,
3852 MODULE_ALIAS("ip_conntrack_netlink");
3853 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3854 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3856 static int __net_init ctnetlink_net_init(struct net *net)
3858 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3859 nf_conntrack_register_notifier(net, &ctnl_notifier);
3864 static void ctnetlink_net_pre_exit(struct net *net)
3866 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3867 nf_conntrack_unregister_notifier(net);
3871 static struct pernet_operations ctnetlink_net_ops = {
3872 .init = ctnetlink_net_init,
3873 .pre_exit = ctnetlink_net_pre_exit,
3876 static int __init ctnetlink_init(void)
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);