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 MODULE_LICENSE("GPL");
59 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
60 const struct nf_conntrack_tuple *tuple,
61 const struct nf_conntrack_l4proto *l4proto)
64 struct nlattr *nest_parms;
66 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO);
69 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
72 if (likely(l4proto->tuple_to_nlattr))
73 ret = l4proto->tuple_to_nlattr(skb, tuple);
75 nla_nest_end(skb, nest_parms);
83 static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
84 const struct nf_conntrack_tuple *tuple)
86 if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
87 nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
92 static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
93 const struct nf_conntrack_tuple *tuple)
95 if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
96 nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
101 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
102 const struct nf_conntrack_tuple *tuple)
105 struct nlattr *nest_parms;
107 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP);
109 goto nla_put_failure;
111 switch (tuple->src.l3num) {
113 ret = ipv4_tuple_to_nlattr(skb, tuple);
116 ret = ipv6_tuple_to_nlattr(skb, tuple);
120 nla_nest_end(skb, nest_parms);
128 static int ctnetlink_dump_tuples(struct sk_buff *skb,
129 const struct nf_conntrack_tuple *tuple)
131 const struct nf_conntrack_l4proto *l4proto;
135 ret = ctnetlink_dump_tuples_ip(skb, tuple);
138 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
139 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
145 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
146 const struct nf_conntrack_zone *zone, int dir)
148 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
150 if (nla_put_be16(skb, attrtype, htons(zone->id)))
151 goto nla_put_failure;
158 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
160 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
161 goto nla_put_failure;
168 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
170 long timeout = nf_ct_expires(ct) / HZ;
172 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
173 goto nla_put_failure;
180 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
182 const struct nf_conntrack_l4proto *l4proto;
183 struct nlattr *nest_proto;
186 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
187 if (!l4proto->to_nlattr)
190 nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
192 goto nla_put_failure;
194 ret = l4proto->to_nlattr(skb, nest_proto, ct);
196 nla_nest_end(skb, nest_proto);
204 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
205 const struct nf_conn *ct)
207 struct nlattr *nest_helper;
208 const struct nf_conn_help *help = nfct_help(ct);
209 struct nf_conntrack_helper *helper;
214 helper = rcu_dereference(help->helper);
218 nest_helper = nla_nest_start(skb, CTA_HELP);
220 goto nla_put_failure;
221 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
222 goto nla_put_failure;
224 if (helper->to_nlattr)
225 helper->to_nlattr(skb, ct);
227 nla_nest_end(skb, nest_helper);
236 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
237 enum ip_conntrack_dir dir, int type)
239 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
240 struct nf_conn_counter *counter = acct->counter;
241 struct nlattr *nest_count;
244 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
245 pkts = atomic64_xchg(&counter[dir].packets, 0);
246 bytes = atomic64_xchg(&counter[dir].bytes, 0);
248 pkts = atomic64_read(&counter[dir].packets);
249 bytes = atomic64_read(&counter[dir].bytes);
252 nest_count = nla_nest_start(skb, attr);
254 goto nla_put_failure;
256 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
258 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
260 goto nla_put_failure;
262 nla_nest_end(skb, nest_count);
271 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
273 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
278 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
280 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
287 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
289 struct nlattr *nest_count;
290 const struct nf_conn_tstamp *tstamp;
292 tstamp = nf_conn_tstamp_find(ct);
296 nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
298 goto nla_put_failure;
300 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
301 CTA_TIMESTAMP_PAD) ||
302 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
303 cpu_to_be64(tstamp->stop),
305 goto nla_put_failure;
306 nla_nest_end(skb, nest_count);
314 #ifdef CONFIG_NF_CONNTRACK_MARK
315 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
317 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
318 goto nla_put_failure;
325 #define ctnetlink_dump_mark(a, b) (0)
328 #ifdef CONFIG_NF_CONNTRACK_SECMARK
329 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
331 struct nlattr *nest_secctx;
335 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
340 nest_secctx = nla_nest_start(skb, CTA_SECCTX);
342 goto nla_put_failure;
344 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
345 goto nla_put_failure;
346 nla_nest_end(skb, nest_secctx);
350 security_release_secctx(secctx, len);
354 #define ctnetlink_dump_secctx(a, b) (0)
357 #ifdef CONFIG_NF_CONNTRACK_LABELS
358 static inline int ctnetlink_label_size(const struct nf_conn *ct)
360 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
364 return nla_total_size(sizeof(labels->bits));
368 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
370 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
378 if (labels->bits[i] != 0)
379 return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
382 } while (i < ARRAY_SIZE(labels->bits));
387 #define ctnetlink_dump_labels(a, b) (0)
388 #define ctnetlink_label_size(a) (0)
391 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
393 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
395 struct nlattr *nest_parms;
397 if (!(ct->status & IPS_EXPECTED))
400 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
402 goto nla_put_failure;
403 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
404 goto nla_put_failure;
405 nla_nest_end(skb, nest_parms);
414 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
416 struct nlattr *nest_parms;
418 nest_parms = nla_nest_start(skb, type);
420 goto nla_put_failure;
422 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
423 htonl(seq->correction_pos)) ||
424 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
425 htonl(seq->offset_before)) ||
426 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
427 htonl(seq->offset_after)))
428 goto nla_put_failure;
430 nla_nest_end(skb, nest_parms);
438 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
440 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
441 struct nf_ct_seqadj *seq;
443 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
446 spin_lock_bh(&ct->lock);
447 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
448 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
451 seq = &seqadj->seq[IP_CT_DIR_REPLY];
452 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
455 spin_unlock_bh(&ct->lock);
458 spin_unlock_bh(&ct->lock);
462 static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
464 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
465 struct nlattr *nest_parms;
470 nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
472 goto nla_put_failure;
474 if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
475 nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
476 nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
477 goto nla_put_failure;
479 nla_nest_end(skb, nest_parms);
487 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
489 __be32 id = (__force __be32)nf_ct_get_id(ct);
491 if (nla_put_be32(skb, CTA_ID, id))
492 goto nla_put_failure;
499 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
501 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
502 goto nla_put_failure;
510 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
513 const struct nf_conntrack_zone *zone;
514 struct nlmsghdr *nlh;
515 struct nfgenmsg *nfmsg;
516 struct nlattr *nest_parms;
517 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
519 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
520 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
524 nfmsg = nlmsg_data(nlh);
525 nfmsg->nfgen_family = nf_ct_l3num(ct);
526 nfmsg->version = NFNETLINK_V0;
529 zone = nf_ct_zone(ct);
531 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
533 goto nla_put_failure;
534 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
535 goto nla_put_failure;
536 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
537 NF_CT_ZONE_DIR_ORIG) < 0)
538 goto nla_put_failure;
539 nla_nest_end(skb, nest_parms);
541 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
543 goto nla_put_failure;
544 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
545 goto nla_put_failure;
546 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
547 NF_CT_ZONE_DIR_REPL) < 0)
548 goto nla_put_failure;
549 nla_nest_end(skb, nest_parms);
551 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
552 NF_CT_DEFAULT_ZONE_DIR) < 0)
553 goto nla_put_failure;
555 if (ctnetlink_dump_status(skb, ct) < 0 ||
556 ctnetlink_dump_timeout(skb, ct) < 0 ||
557 ctnetlink_dump_acct(skb, ct, type) < 0 ||
558 ctnetlink_dump_timestamp(skb, ct) < 0 ||
559 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
560 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
561 ctnetlink_dump_mark(skb, ct) < 0 ||
562 ctnetlink_dump_secctx(skb, ct) < 0 ||
563 ctnetlink_dump_labels(skb, ct) < 0 ||
564 ctnetlink_dump_id(skb, ct) < 0 ||
565 ctnetlink_dump_use(skb, ct) < 0 ||
566 ctnetlink_dump_master(skb, ct) < 0 ||
567 ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
568 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
569 goto nla_put_failure;
576 nlmsg_cancel(skb, nlh);
580 static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
581 [CTA_IP_V4_SRC] = { .type = NLA_U32 },
582 [CTA_IP_V4_DST] = { .type = NLA_U32 },
583 [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
584 [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
587 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
588 static size_t ctnetlink_proto_size(const struct nf_conn *ct)
590 const struct nf_conntrack_l4proto *l4proto;
591 size_t len, len4 = 0;
593 len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
594 len *= 3u; /* ORIG, REPLY, MASTER */
596 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
597 len += l4proto->nlattr_size;
598 if (l4proto->nlattr_tuple_size) {
599 len4 = l4proto->nlattr_tuple_size();
600 len4 *= 3u; /* ORIG, REPLY, MASTER */
607 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
609 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
611 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
612 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
613 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
617 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
619 #ifdef CONFIG_NF_CONNTRACK_SECMARK
622 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
626 return nla_total_size(0) /* CTA_SECCTX */
627 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
633 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
635 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
636 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
638 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
644 #ifdef CONFIG_NF_CONNTRACK_EVENTS
645 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
647 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
648 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
649 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
650 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
651 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
652 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
653 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
654 + ctnetlink_acct_size(ct)
655 + ctnetlink_timestamp_size(ct)
656 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
657 + nla_total_size(0) /* CTA_PROTOINFO */
658 + nla_total_size(0) /* CTA_HELP */
659 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
660 + ctnetlink_secctx_size(ct)
661 #if IS_ENABLED(CONFIG_NF_NAT)
662 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
663 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
665 #ifdef CONFIG_NF_CONNTRACK_MARK
666 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
668 #ifdef CONFIG_NF_CONNTRACK_ZONES
669 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
671 + ctnetlink_proto_size(ct)
672 + ctnetlink_label_size(ct)
677 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
679 const struct nf_conntrack_zone *zone;
681 struct nlmsghdr *nlh;
682 struct nfgenmsg *nfmsg;
683 struct nlattr *nest_parms;
684 struct nf_conn *ct = item->ct;
687 unsigned int flags = 0, group;
690 if (events & (1 << IPCT_DESTROY)) {
691 type = IPCTNL_MSG_CT_DELETE;
692 group = NFNLGRP_CONNTRACK_DESTROY;
693 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
694 type = IPCTNL_MSG_CT_NEW;
695 flags = NLM_F_CREATE|NLM_F_EXCL;
696 group = NFNLGRP_CONNTRACK_NEW;
698 type = IPCTNL_MSG_CT_NEW;
699 group = NFNLGRP_CONNTRACK_UPDATE;
704 if (!item->report && !nfnetlink_has_listeners(net, group))
707 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
711 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
712 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
716 nfmsg = nlmsg_data(nlh);
717 nfmsg->nfgen_family = nf_ct_l3num(ct);
718 nfmsg->version = NFNETLINK_V0;
721 zone = nf_ct_zone(ct);
723 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
725 goto nla_put_failure;
726 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
727 goto nla_put_failure;
728 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
729 NF_CT_ZONE_DIR_ORIG) < 0)
730 goto nla_put_failure;
731 nla_nest_end(skb, nest_parms);
733 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
735 goto nla_put_failure;
736 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
737 goto nla_put_failure;
738 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
739 NF_CT_ZONE_DIR_REPL) < 0)
740 goto nla_put_failure;
741 nla_nest_end(skb, nest_parms);
743 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
744 NF_CT_DEFAULT_ZONE_DIR) < 0)
745 goto nla_put_failure;
747 if (ctnetlink_dump_id(skb, ct) < 0)
748 goto nla_put_failure;
750 if (ctnetlink_dump_status(skb, ct) < 0)
751 goto nla_put_failure;
753 if (events & (1 << IPCT_DESTROY)) {
754 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
755 ctnetlink_dump_timestamp(skb, ct) < 0)
756 goto nla_put_failure;
758 if (ctnetlink_dump_timeout(skb, ct) < 0)
759 goto nla_put_failure;
761 if (events & (1 << IPCT_PROTOINFO)
762 && ctnetlink_dump_protoinfo(skb, ct) < 0)
763 goto nla_put_failure;
765 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
766 && ctnetlink_dump_helpinfo(skb, ct) < 0)
767 goto nla_put_failure;
769 #ifdef CONFIG_NF_CONNTRACK_SECMARK
770 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
771 && ctnetlink_dump_secctx(skb, ct) < 0)
772 goto nla_put_failure;
774 if (events & (1 << IPCT_LABEL) &&
775 ctnetlink_dump_labels(skb, ct) < 0)
776 goto nla_put_failure;
778 if (events & (1 << IPCT_RELATED) &&
779 ctnetlink_dump_master(skb, ct) < 0)
780 goto nla_put_failure;
782 if (events & (1 << IPCT_SEQADJ) &&
783 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
784 goto nla_put_failure;
786 if (events & (1 << IPCT_SYNPROXY) &&
787 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
788 goto nla_put_failure;
791 #ifdef CONFIG_NF_CONNTRACK_MARK
792 if ((events & (1 << IPCT_MARK) || ct->mark)
793 && ctnetlink_dump_mark(skb, ct) < 0)
794 goto nla_put_failure;
797 err = nfnetlink_send(skb, net, item->portid, group, item->report,
799 if (err == -ENOBUFS || err == -EAGAIN)
805 nlmsg_cancel(skb, nlh);
809 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
814 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
816 static int ctnetlink_done(struct netlink_callback *cb)
819 nf_ct_put((struct nf_conn *)cb->args[1]);
824 struct ctnetlink_filter {
832 static struct ctnetlink_filter *
833 ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
835 struct ctnetlink_filter *filter;
837 #ifndef CONFIG_NF_CONNTRACK_MARK
838 if (cda[CTA_MARK] && cda[CTA_MARK_MASK])
839 return ERR_PTR(-EOPNOTSUPP);
842 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
844 return ERR_PTR(-ENOMEM);
846 filter->family = family;
848 #ifdef CONFIG_NF_CONNTRACK_MARK
849 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
850 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
851 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
857 static int ctnetlink_start(struct netlink_callback *cb)
859 const struct nlattr * const *cda = cb->data;
860 struct ctnetlink_filter *filter = NULL;
861 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
862 u8 family = nfmsg->nfgen_family;
864 if (family || (cda[CTA_MARK] && cda[CTA_MARK_MASK])) {
865 filter = ctnetlink_alloc_filter(cda, family);
867 return PTR_ERR(filter);
874 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
876 struct ctnetlink_filter *filter = data;
881 /* Match entries of a given L3 protocol number.
882 * If it is not specified, ie. l3proto == 0,
883 * then match everything.
885 if (filter->family && nf_ct_l3num(ct) != filter->family)
888 #ifdef CONFIG_NF_CONNTRACK_MARK
889 if ((ct->mark & filter->mark.mask) != filter->mark.val)
901 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
903 struct net *net = sock_net(skb->sk);
904 struct nf_conn *ct, *last;
905 struct nf_conntrack_tuple_hash *h;
906 struct hlist_nulls_node *n;
907 struct nf_conn *nf_ct_evict[8];
911 last = (struct nf_conn *)cb->args[1];
915 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
919 if (nf_ct_should_gc(nf_ct_evict[i]))
920 nf_ct_kill(nf_ct_evict[i]);
921 nf_ct_put(nf_ct_evict[i]);
924 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
925 nf_conntrack_lock(lockp);
926 if (cb->args[0] >= nf_conntrack_htable_size) {
930 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
932 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
934 ct = nf_ct_tuplehash_to_ctrack(h);
935 if (nf_ct_is_expired(ct)) {
936 if (i < ARRAY_SIZE(nf_ct_evict) &&
937 atomic_inc_not_zero(&ct->ct_general.use))
938 nf_ct_evict[i++] = ct;
942 if (!net_eq(net, nf_ct_net(ct)))
950 if (!ctnetlink_filter_match(ct, cb->data))
955 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
957 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
961 nf_conntrack_get(&ct->ct_general);
962 cb->args[1] = (unsigned long)ct;
976 /* nf ct hash resize happened, now clear the leftover. */
977 if ((struct nf_conn *)cb->args[1] == last)
985 if (nf_ct_should_gc(nf_ct_evict[i]))
986 nf_ct_kill(nf_ct_evict[i]);
987 nf_ct_put(nf_ct_evict[i]);
993 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
994 struct nf_conntrack_tuple *t)
996 if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST])
999 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1000 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1005 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1006 struct nf_conntrack_tuple *t)
1008 if (!tb[CTA_IP_V6_SRC] || !tb[CTA_IP_V6_DST])
1011 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1012 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1017 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1018 struct nf_conntrack_tuple *tuple)
1020 struct nlattr *tb[CTA_IP_MAX+1];
1023 ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
1027 ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
1028 cta_ip_nla_policy, NULL);
1032 switch (tuple->src.l3num) {
1034 ret = ipv4_nlattr_to_tuple(tb, tuple);
1037 ret = ipv6_nlattr_to_tuple(tb, tuple);
1044 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1045 [CTA_PROTO_NUM] = { .type = NLA_U8 },
1048 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1049 struct nf_conntrack_tuple *tuple)
1051 const struct nf_conntrack_l4proto *l4proto;
1052 struct nlattr *tb[CTA_PROTO_MAX+1];
1055 ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1056 proto_nla_policy, NULL);
1060 if (!tb[CTA_PROTO_NUM])
1062 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1065 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1067 if (likely(l4proto->nlattr_to_tuple)) {
1068 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1069 l4proto->nla_policy,
1072 ret = l4proto->nlattr_to_tuple(tb, tuple);
1081 ctnetlink_parse_zone(const struct nlattr *attr,
1082 struct nf_conntrack_zone *zone)
1084 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1085 NF_CT_DEFAULT_ZONE_DIR, 0);
1086 #ifdef CONFIG_NF_CONNTRACK_ZONES
1088 zone->id = ntohs(nla_get_be16(attr));
1097 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1098 struct nf_conntrack_zone *zone)
1102 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1105 ret = ctnetlink_parse_zone(attr, zone);
1109 if (type == CTA_TUPLE_REPLY)
1110 zone->dir = NF_CT_ZONE_DIR_REPL;
1112 zone->dir = NF_CT_ZONE_DIR_ORIG;
1117 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1118 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1119 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1120 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1124 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1125 struct nf_conntrack_tuple *tuple, u32 type,
1126 u_int8_t l3num, struct nf_conntrack_zone *zone)
1128 struct nlattr *tb[CTA_TUPLE_MAX+1];
1131 memset(tuple, 0, sizeof(*tuple));
1133 err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1134 tuple_nla_policy, NULL);
1138 if (!tb[CTA_TUPLE_IP])
1141 tuple->src.l3num = l3num;
1143 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
1147 if (!tb[CTA_TUPLE_PROTO])
1150 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
1154 if (tb[CTA_TUPLE_ZONE]) {
1158 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1164 /* orig and expect tuples get DIR_ORIGINAL */
1165 if (type == CTA_TUPLE_REPLY)
1166 tuple->dst.dir = IP_CT_DIR_REPLY;
1168 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1173 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1174 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1175 .len = NF_CT_HELPER_NAME_LEN - 1 },
1178 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1179 struct nlattr **helpinfo)
1182 struct nlattr *tb[CTA_HELP_MAX+1];
1184 err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1185 help_nla_policy, NULL);
1189 if (!tb[CTA_HELP_NAME])
1192 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1194 if (tb[CTA_HELP_INFO])
1195 *helpinfo = tb[CTA_HELP_INFO];
1200 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1201 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1202 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1203 [CTA_STATUS] = { .type = NLA_U32 },
1204 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1205 [CTA_HELP] = { .type = NLA_NESTED },
1206 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1207 [CTA_TIMEOUT] = { .type = NLA_U32 },
1208 [CTA_MARK] = { .type = NLA_U32 },
1209 [CTA_ID] = { .type = NLA_U32 },
1210 [CTA_NAT_DST] = { .type = NLA_NESTED },
1211 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1212 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1213 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1214 [CTA_ZONE] = { .type = NLA_U16 },
1215 [CTA_MARK_MASK] = { .type = NLA_U32 },
1216 [CTA_LABELS] = { .type = NLA_BINARY,
1217 .len = NF_CT_LABELS_MAX_SIZE },
1218 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1219 .len = NF_CT_LABELS_MAX_SIZE },
1222 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1224 if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1227 return ctnetlink_filter_match(ct, data);
1230 static int ctnetlink_flush_conntrack(struct net *net,
1231 const struct nlattr * const cda[],
1232 u32 portid, int report, u8 family)
1234 struct ctnetlink_filter *filter = NULL;
1236 if (family || (cda[CTA_MARK] && cda[CTA_MARK_MASK])) {
1237 filter = ctnetlink_alloc_filter(cda, family);
1239 return PTR_ERR(filter);
1242 nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
1249 static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1250 struct sk_buff *skb,
1251 const struct nlmsghdr *nlh,
1252 const struct nlattr * const cda[],
1253 struct netlink_ext_ack *extack)
1255 struct nf_conntrack_tuple_hash *h;
1256 struct nf_conntrack_tuple tuple;
1258 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1259 u_int8_t u3 = nfmsg->version ? nfmsg->nfgen_family : AF_UNSPEC;
1260 struct nf_conntrack_zone zone;
1263 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1267 if (cda[CTA_TUPLE_ORIG])
1268 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1270 else if (cda[CTA_TUPLE_REPLY])
1271 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1274 return ctnetlink_flush_conntrack(net, cda,
1275 NETLINK_CB(skb).portid,
1276 nlmsg_report(nlh), u3);
1282 h = nf_conntrack_find_get(net, &zone, &tuple);
1286 ct = nf_ct_tuplehash_to_ctrack(h);
1288 if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1294 __be32 id = nla_get_be32(cda[CTA_ID]);
1296 if (id != (__force __be32)nf_ct_get_id(ct)) {
1302 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1308 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1309 struct sk_buff *skb,
1310 const struct nlmsghdr *nlh,
1311 const struct nlattr * const cda[],
1312 struct netlink_ext_ack *extack)
1314 struct nf_conntrack_tuple_hash *h;
1315 struct nf_conntrack_tuple tuple;
1317 struct sk_buff *skb2 = NULL;
1318 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1319 u_int8_t u3 = nfmsg->nfgen_family;
1320 struct nf_conntrack_zone zone;
1323 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1324 struct netlink_dump_control c = {
1325 .start = ctnetlink_start,
1326 .dump = ctnetlink_dump_table,
1327 .done = ctnetlink_done,
1328 .data = (void *)cda,
1331 return netlink_dump_start(ctnl, skb, nlh, &c);
1334 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1338 if (cda[CTA_TUPLE_ORIG])
1339 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1341 else if (cda[CTA_TUPLE_REPLY])
1342 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1350 h = nf_conntrack_find_get(net, &zone, &tuple);
1354 ct = nf_ct_tuplehash_to_ctrack(h);
1357 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1364 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1365 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1371 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1380 /* this avoids a loop in nfnetlink. */
1381 return err == -EAGAIN ? -ENOBUFS : err;
1384 static int ctnetlink_done_list(struct netlink_callback *cb)
1387 nf_ct_put((struct nf_conn *)cb->args[1]);
1392 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1394 struct nf_conn *ct, *last;
1395 struct nf_conntrack_tuple_hash *h;
1396 struct hlist_nulls_node *n;
1397 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1398 u_int8_t l3proto = nfmsg->nfgen_family;
1401 struct hlist_nulls_head *list;
1402 struct net *net = sock_net(skb->sk);
1407 last = (struct nf_conn *)cb->args[1];
1409 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1410 struct ct_pcpu *pcpu;
1412 if (!cpu_possible(cpu))
1415 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1416 spin_lock_bh(&pcpu->lock);
1417 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1419 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1420 ct = nf_ct_tuplehash_to_ctrack(h);
1421 if (l3proto && nf_ct_l3num(ct) != l3proto)
1429 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1431 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1435 if (!atomic_inc_not_zero(&ct->ct_general.use))
1438 cb->args[1] = (unsigned long)ct;
1439 spin_unlock_bh(&pcpu->lock);
1447 spin_unlock_bh(&pcpu->lock);
1458 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1460 return ctnetlink_dump_list(skb, cb, true);
1463 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1464 struct sk_buff *skb,
1465 const struct nlmsghdr *nlh,
1466 const struct nlattr * const cda[],
1467 struct netlink_ext_ack *extack)
1469 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1470 struct netlink_dump_control c = {
1471 .dump = ctnetlink_dump_dying,
1472 .done = ctnetlink_done_list,
1474 return netlink_dump_start(ctnl, skb, nlh, &c);
1481 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1483 return ctnetlink_dump_list(skb, cb, false);
1486 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1487 struct sk_buff *skb,
1488 const struct nlmsghdr *nlh,
1489 const struct nlattr * const cda[],
1490 struct netlink_ext_ack *extack)
1492 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1493 struct netlink_dump_control c = {
1494 .dump = ctnetlink_dump_unconfirmed,
1495 .done = ctnetlink_done_list,
1497 return netlink_dump_start(ctnl, skb, nlh, &c);
1503 #if IS_ENABLED(CONFIG_NF_NAT)
1505 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1506 enum nf_nat_manip_type manip,
1507 const struct nlattr *attr)
1509 struct nf_nat_hook *nat_hook;
1512 nat_hook = rcu_dereference(nf_nat_hook);
1514 #ifdef CONFIG_MODULES
1516 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1517 if (request_module("nf-nat") < 0) {
1518 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1522 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1524 nat_hook = rcu_dereference(nf_nat_hook);
1531 err = nat_hook->parse_nat_setup(ct, manip, attr);
1532 if (err == -EAGAIN) {
1533 #ifdef CONFIG_MODULES
1535 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1536 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1537 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1541 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1552 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1557 /* Ignore these unchangable bits */
1558 on &= ~IPS_UNCHANGEABLE_MASK;
1559 off &= ~IPS_UNCHANGEABLE_MASK;
1561 for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1562 if (on & (1 << bit))
1563 set_bit(bit, &ct->status);
1564 else if (off & (1 << bit))
1565 clear_bit(bit, &ct->status);
1570 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1573 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1574 d = ct->status ^ status;
1576 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1580 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1581 /* SEEN_REPLY bit can only be set */
1584 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1585 /* ASSURED bit can only be set */
1588 __ctnetlink_change_status(ct, status, 0);
1593 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1595 #if IS_ENABLED(CONFIG_NF_NAT)
1598 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1601 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1606 return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1609 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1615 static int ctnetlink_change_helper(struct nf_conn *ct,
1616 const struct nlattr * const cda[])
1618 struct nf_conntrack_helper *helper;
1619 struct nf_conn_help *help = nfct_help(ct);
1620 char *helpname = NULL;
1621 struct nlattr *helpinfo = NULL;
1624 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1628 /* don't change helper of sibling connections */
1630 /* If we try to change the helper to the same thing twice,
1631 * treat the second attempt as a no-op instead of returning
1637 helper = rcu_dereference(help->helper);
1638 if (helper && !strcmp(helper->name, helpname))
1646 if (!strcmp(helpname, "")) {
1647 if (help && help->helper) {
1648 /* we had a helper before ... */
1649 nf_ct_remove_expectations(ct);
1650 RCU_INIT_POINTER(help->helper, NULL);
1657 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1658 nf_ct_protonum(ct));
1659 if (helper == NULL) {
1665 if (help->helper == helper) {
1666 /* update private helper data if allowed. */
1667 if (helper->from_nlattr)
1668 helper->from_nlattr(helpinfo, ct);
1673 /* we cannot set a helper for an existing conntrack */
1681 static int ctnetlink_change_timeout(struct nf_conn *ct,
1682 const struct nlattr * const cda[])
1684 u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1686 if (timeout > INT_MAX)
1688 ct->timeout = nfct_time_stamp + (u32)timeout;
1690 if (test_bit(IPS_DYING_BIT, &ct->status))
1696 #if defined(CONFIG_NF_CONNTRACK_MARK)
1697 static void ctnetlink_change_mark(struct nf_conn *ct,
1698 const struct nlattr * const cda[])
1700 u32 mark, newmark, mask = 0;
1702 if (cda[CTA_MARK_MASK])
1703 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1705 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1706 newmark = (ct->mark & mask) ^ mark;
1707 if (newmark != ct->mark)
1712 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1713 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1714 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1715 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1718 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
1719 const struct nlattr * const cda[])
1721 const struct nlattr *attr = cda[CTA_PROTOINFO];
1722 const struct nf_conntrack_l4proto *l4proto;
1723 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1726 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
1727 protoinfo_policy, NULL);
1731 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
1732 if (l4proto->from_nlattr)
1733 err = l4proto->from_nlattr(tb, ct);
1738 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1739 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1740 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1741 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1744 static int change_seq_adj(struct nf_ct_seqadj *seq,
1745 const struct nlattr * const attr)
1748 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1750 err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
1751 seqadj_policy, NULL);
1755 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1758 seq->correction_pos =
1759 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1761 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1764 seq->offset_before =
1765 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1767 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1771 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1777 ctnetlink_change_seq_adj(struct nf_conn *ct,
1778 const struct nlattr * const cda[])
1780 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1786 spin_lock_bh(&ct->lock);
1787 if (cda[CTA_SEQ_ADJ_ORIG]) {
1788 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1789 cda[CTA_SEQ_ADJ_ORIG]);
1793 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1796 if (cda[CTA_SEQ_ADJ_REPLY]) {
1797 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1798 cda[CTA_SEQ_ADJ_REPLY]);
1802 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1805 spin_unlock_bh(&ct->lock);
1808 spin_unlock_bh(&ct->lock);
1812 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
1813 [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
1814 [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
1815 [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
1818 static int ctnetlink_change_synproxy(struct nf_conn *ct,
1819 const struct nlattr * const cda[])
1821 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
1822 struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
1828 err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
1829 cda[CTA_SYNPROXY], synproxy_policy,
1834 if (!tb[CTA_SYNPROXY_ISN] ||
1835 !tb[CTA_SYNPROXY_ITS] ||
1836 !tb[CTA_SYNPROXY_TSOFF])
1839 synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
1840 synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
1841 synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
1847 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1849 #ifdef CONFIG_NF_CONNTRACK_LABELS
1850 size_t len = nla_len(cda[CTA_LABELS]);
1851 const void *mask = cda[CTA_LABELS_MASK];
1853 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1857 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1858 nla_len(cda[CTA_LABELS_MASK]) != len)
1860 mask = nla_data(cda[CTA_LABELS_MASK]);
1865 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1872 ctnetlink_change_conntrack(struct nf_conn *ct,
1873 const struct nlattr * const cda[])
1877 /* only allow NAT changes and master assignation for new conntracks */
1878 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1881 if (cda[CTA_HELP]) {
1882 err = ctnetlink_change_helper(ct, cda);
1887 if (cda[CTA_TIMEOUT]) {
1888 err = ctnetlink_change_timeout(ct, cda);
1893 if (cda[CTA_STATUS]) {
1894 err = ctnetlink_change_status(ct, cda);
1899 if (cda[CTA_PROTOINFO]) {
1900 err = ctnetlink_change_protoinfo(ct, cda);
1905 #if defined(CONFIG_NF_CONNTRACK_MARK)
1907 ctnetlink_change_mark(ct, cda);
1910 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1911 err = ctnetlink_change_seq_adj(ct, cda);
1916 if (cda[CTA_SYNPROXY]) {
1917 err = ctnetlink_change_synproxy(ct, cda);
1922 if (cda[CTA_LABELS]) {
1923 err = ctnetlink_attach_labels(ct, cda);
1931 static struct nf_conn *
1932 ctnetlink_create_conntrack(struct net *net,
1933 const struct nf_conntrack_zone *zone,
1934 const struct nlattr * const cda[],
1935 struct nf_conntrack_tuple *otuple,
1936 struct nf_conntrack_tuple *rtuple,
1941 struct nf_conntrack_helper *helper;
1942 struct nf_conn_tstamp *tstamp;
1945 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1947 return ERR_PTR(-ENOMEM);
1949 if (!cda[CTA_TIMEOUT])
1952 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1953 if (timeout > INT_MAX)
1955 ct->timeout = (u32)timeout + nfct_time_stamp;
1958 if (cda[CTA_HELP]) {
1959 char *helpname = NULL;
1960 struct nlattr *helpinfo = NULL;
1962 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1966 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1967 nf_ct_protonum(ct));
1968 if (helper == NULL) {
1970 #ifdef CONFIG_MODULES
1971 if (request_module("nfct-helper-%s", helpname) < 0) {
1977 helper = __nf_conntrack_helper_find(helpname,
1979 nf_ct_protonum(ct));
1989 struct nf_conn_help *help;
1991 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1996 /* set private helper data if allowed. */
1997 if (helper->from_nlattr)
1998 helper->from_nlattr(helpinfo, ct);
2000 /* not in hash table yet so not strictly necessary */
2001 RCU_INIT_POINTER(help->helper, helper);
2004 /* try an implicit helper assignation */
2005 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
2010 err = ctnetlink_setup_nat(ct, cda);
2014 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2015 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2016 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2017 nf_ct_labels_ext_add(ct);
2018 nfct_seqadj_ext_add(ct);
2019 nfct_synproxy_ext_add(ct);
2021 /* we must add conntrack extensions before confirmation. */
2022 ct->status |= IPS_CONFIRMED;
2024 if (cda[CTA_STATUS]) {
2025 err = ctnetlink_change_status(ct, cda);
2030 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2031 err = ctnetlink_change_seq_adj(ct, cda);
2036 memset(&ct->proto, 0, sizeof(ct->proto));
2037 if (cda[CTA_PROTOINFO]) {
2038 err = ctnetlink_change_protoinfo(ct, cda);
2043 if (cda[CTA_SYNPROXY]) {
2044 err = ctnetlink_change_synproxy(ct, cda);
2049 #if defined(CONFIG_NF_CONNTRACK_MARK)
2051 ctnetlink_change_mark(ct, cda);
2054 /* setup master conntrack: this is a confirmed expectation */
2055 if (cda[CTA_TUPLE_MASTER]) {
2056 struct nf_conntrack_tuple master;
2057 struct nf_conntrack_tuple_hash *master_h;
2058 struct nf_conn *master_ct;
2060 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2065 master_h = nf_conntrack_find_get(net, zone, &master);
2066 if (master_h == NULL) {
2070 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2071 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2072 ct->master = master_ct;
2074 tstamp = nf_conn_tstamp_find(ct);
2076 tstamp->start = ktime_get_real_ns();
2078 err = nf_conntrack_hash_check_insert(ct);
2089 nf_conntrack_free(ct);
2090 return ERR_PTR(err);
2093 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
2094 struct sk_buff *skb,
2095 const struct nlmsghdr *nlh,
2096 const struct nlattr * const cda[],
2097 struct netlink_ext_ack *extack)
2099 struct nf_conntrack_tuple otuple, rtuple;
2100 struct nf_conntrack_tuple_hash *h = NULL;
2101 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2103 u_int8_t u3 = nfmsg->nfgen_family;
2104 struct nf_conntrack_zone zone;
2107 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2111 if (cda[CTA_TUPLE_ORIG]) {
2112 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2118 if (cda[CTA_TUPLE_REPLY]) {
2119 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2125 if (cda[CTA_TUPLE_ORIG])
2126 h = nf_conntrack_find_get(net, &zone, &otuple);
2127 else if (cda[CTA_TUPLE_REPLY])
2128 h = nf_conntrack_find_get(net, &zone, &rtuple);
2132 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2133 enum ip_conntrack_events events;
2135 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2137 if (otuple.dst.protonum != rtuple.dst.protonum)
2140 ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
2146 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2147 events = 1 << IPCT_RELATED;
2149 events = 1 << IPCT_NEW;
2151 if (cda[CTA_LABELS] &&
2152 ctnetlink_attach_labels(ct, cda) == 0)
2153 events |= (1 << IPCT_LABEL);
2155 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2156 (1 << IPCT_ASSURED) |
2157 (1 << IPCT_HELPER) |
2158 (1 << IPCT_PROTOINFO) |
2159 (1 << IPCT_SEQADJ) |
2161 (1 << IPCT_SYNPROXY) |
2163 ct, NETLINK_CB(skb).portid,
2170 /* implicit 'else' */
2173 ct = nf_ct_tuplehash_to_ctrack(h);
2174 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
2175 err = ctnetlink_change_conntrack(ct, cda);
2177 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2178 (1 << IPCT_ASSURED) |
2179 (1 << IPCT_HELPER) |
2181 (1 << IPCT_PROTOINFO) |
2182 (1 << IPCT_SEQADJ) |
2184 (1 << IPCT_SYNPROXY),
2185 ct, NETLINK_CB(skb).portid,
2195 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2196 __u16 cpu, const struct ip_conntrack_stat *st)
2198 struct nlmsghdr *nlh;
2199 struct nfgenmsg *nfmsg;
2200 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2202 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2203 IPCTNL_MSG_CT_GET_STATS_CPU);
2204 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2208 nfmsg = nlmsg_data(nlh);
2209 nfmsg->nfgen_family = AF_UNSPEC;
2210 nfmsg->version = NFNETLINK_V0;
2211 nfmsg->res_id = htons(cpu);
2213 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2214 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2215 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
2216 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2217 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2218 htonl(st->insert_failed)) ||
2219 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2220 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2221 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2222 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2223 htonl(st->search_restart)))
2224 goto nla_put_failure;
2226 nlmsg_end(skb, nlh);
2231 nlmsg_cancel(skb, nlh);
2236 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2239 struct net *net = sock_net(skb->sk);
2241 if (cb->args[0] == nr_cpu_ids)
2244 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2245 const struct ip_conntrack_stat *st;
2247 if (!cpu_possible(cpu))
2250 st = per_cpu_ptr(net->ct.stat, cpu);
2251 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2252 NETLINK_CB(cb->skb).portid,
2262 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2263 struct sk_buff *skb,
2264 const struct nlmsghdr *nlh,
2265 const struct nlattr * const cda[],
2266 struct netlink_ext_ack *extack)
2268 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2269 struct netlink_dump_control c = {
2270 .dump = ctnetlink_ct_stat_cpu_dump,
2272 return netlink_dump_start(ctnl, skb, nlh, &c);
2279 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2282 struct nlmsghdr *nlh;
2283 struct nfgenmsg *nfmsg;
2284 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2285 unsigned int nr_conntracks = atomic_read(&net->ct.count);
2287 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2288 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2292 nfmsg = nlmsg_data(nlh);
2293 nfmsg->nfgen_family = AF_UNSPEC;
2294 nfmsg->version = NFNETLINK_V0;
2297 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2298 goto nla_put_failure;
2300 if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2301 goto nla_put_failure;
2303 nlmsg_end(skb, nlh);
2308 nlmsg_cancel(skb, nlh);
2312 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2313 struct sk_buff *skb, const struct nlmsghdr *nlh,
2314 const struct nlattr * const cda[],
2315 struct netlink_ext_ack *extack)
2317 struct sk_buff *skb2;
2320 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2324 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2326 NFNL_MSG_TYPE(nlh->nlmsg_type),
2331 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2340 /* this avoids a loop in nfnetlink. */
2341 return err == -EAGAIN ? -ENOBUFS : err;
2344 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2345 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2346 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2347 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2348 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2349 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2350 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2351 .len = NF_CT_HELPER_NAME_LEN - 1 },
2352 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2353 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2354 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2355 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2356 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2359 static struct nf_conntrack_expect *
2360 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2361 struct nf_conntrack_helper *helper,
2362 struct nf_conntrack_tuple *tuple,
2363 struct nf_conntrack_tuple *mask);
2365 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2367 ctnetlink_glue_build_size(const struct nf_conn *ct)
2369 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2370 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2371 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2372 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2373 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2374 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2375 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2376 + nla_total_size(0) /* CTA_PROTOINFO */
2377 + nla_total_size(0) /* CTA_HELP */
2378 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2379 + ctnetlink_secctx_size(ct)
2380 #if IS_ENABLED(CONFIG_NF_NAT)
2381 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2382 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2384 #ifdef CONFIG_NF_CONNTRACK_MARK
2385 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2387 #ifdef CONFIG_NF_CONNTRACK_ZONES
2388 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2390 + ctnetlink_proto_size(ct)
2394 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2395 enum ip_conntrack_info *ctinfo)
2397 return nf_ct_get(skb, ctinfo);
2400 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2402 const struct nf_conntrack_zone *zone;
2403 struct nlattr *nest_parms;
2405 zone = nf_ct_zone(ct);
2407 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2409 goto nla_put_failure;
2410 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2411 goto nla_put_failure;
2412 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2413 NF_CT_ZONE_DIR_ORIG) < 0)
2414 goto nla_put_failure;
2415 nla_nest_end(skb, nest_parms);
2417 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2419 goto nla_put_failure;
2420 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2421 goto nla_put_failure;
2422 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2423 NF_CT_ZONE_DIR_REPL) < 0)
2424 goto nla_put_failure;
2425 nla_nest_end(skb, nest_parms);
2427 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2428 NF_CT_DEFAULT_ZONE_DIR) < 0)
2429 goto nla_put_failure;
2431 if (ctnetlink_dump_id(skb, ct) < 0)
2432 goto nla_put_failure;
2434 if (ctnetlink_dump_status(skb, ct) < 0)
2435 goto nla_put_failure;
2437 if (ctnetlink_dump_timeout(skb, ct) < 0)
2438 goto nla_put_failure;
2440 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2441 goto nla_put_failure;
2443 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2444 goto nla_put_failure;
2446 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2447 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2448 goto nla_put_failure;
2450 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2451 goto nla_put_failure;
2453 if ((ct->status & IPS_SEQ_ADJUST) &&
2454 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2455 goto nla_put_failure;
2457 if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2458 goto nla_put_failure;
2460 #ifdef CONFIG_NF_CONNTRACK_MARK
2461 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2462 goto nla_put_failure;
2464 if (ctnetlink_dump_labels(skb, ct) < 0)
2465 goto nla_put_failure;
2473 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2474 enum ip_conntrack_info ctinfo,
2475 u_int16_t ct_attr, u_int16_t ct_info_attr)
2477 struct nlattr *nest_parms;
2479 nest_parms = nla_nest_start(skb, ct_attr);
2481 goto nla_put_failure;
2483 if (__ctnetlink_glue_build(skb, ct) < 0)
2484 goto nla_put_failure;
2486 nla_nest_end(skb, nest_parms);
2488 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2489 goto nla_put_failure;
2498 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2500 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2501 unsigned long d = ct->status ^ status;
2503 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2504 /* SEEN_REPLY bit can only be set */
2507 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2508 /* ASSURED bit can only be set */
2511 /* This check is less strict than ctnetlink_change_status()
2512 * because callers often flip IPS_EXPECTED bits when sending
2513 * an NFQA_CT attribute to the kernel. So ignore the
2514 * unchangeable bits but do not error out. Also user programs
2515 * are allowed to clear the bits that they are allowed to change.
2517 __ctnetlink_change_status(ct, status, ~status);
2522 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2526 if (cda[CTA_TIMEOUT]) {
2527 err = ctnetlink_change_timeout(ct, cda);
2531 if (cda[CTA_STATUS]) {
2532 err = ctnetlink_update_status(ct, cda);
2536 if (cda[CTA_HELP]) {
2537 err = ctnetlink_change_helper(ct, cda);
2541 if (cda[CTA_LABELS]) {
2542 err = ctnetlink_attach_labels(ct, cda);
2546 #if defined(CONFIG_NF_CONNTRACK_MARK)
2547 if (cda[CTA_MARK]) {
2548 ctnetlink_change_mark(ct, cda);
2555 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2557 struct nlattr *cda[CTA_MAX+1];
2560 ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2565 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2568 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2569 const struct nf_conn *ct,
2570 struct nf_conntrack_tuple *tuple,
2571 struct nf_conntrack_tuple *mask)
2575 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2576 nf_ct_l3num(ct), NULL);
2580 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2581 nf_ct_l3num(ct), NULL);
2585 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2586 u32 portid, u32 report)
2588 struct nlattr *cda[CTA_EXPECT_MAX+1];
2589 struct nf_conntrack_tuple tuple, mask;
2590 struct nf_conntrack_helper *helper = NULL;
2591 struct nf_conntrack_expect *exp;
2594 err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2595 exp_nla_policy, NULL);
2599 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2604 if (cda[CTA_EXPECT_HELP_NAME]) {
2605 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2607 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2608 nf_ct_protonum(ct));
2613 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2614 helper, &tuple, &mask);
2616 return PTR_ERR(exp);
2618 err = nf_ct_expect_related_report(exp, portid, report);
2619 nf_ct_expect_put(exp);
2623 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2624 enum ip_conntrack_info ctinfo, int diff)
2626 if (!(ct->status & IPS_NAT_MASK))
2629 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2632 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2633 .get_ct = ctnetlink_glue_get_ct,
2634 .build_size = ctnetlink_glue_build_size,
2635 .build = ctnetlink_glue_build,
2636 .parse = ctnetlink_glue_parse,
2637 .attach_expect = ctnetlink_glue_attach_expect,
2638 .seq_adjust = ctnetlink_glue_seqadj,
2640 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2642 /***********************************************************************
2644 ***********************************************************************/
2646 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2647 const struct nf_conntrack_tuple *tuple,
2650 struct nlattr *nest_parms;
2652 nest_parms = nla_nest_start(skb, type);
2654 goto nla_put_failure;
2655 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2656 goto nla_put_failure;
2657 nla_nest_end(skb, nest_parms);
2665 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2666 const struct nf_conntrack_tuple *tuple,
2667 const struct nf_conntrack_tuple_mask *mask)
2669 const struct nf_conntrack_l4proto *l4proto;
2670 struct nf_conntrack_tuple m;
2671 struct nlattr *nest_parms;
2674 memset(&m, 0xFF, sizeof(m));
2675 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2676 m.src.u.all = mask->src.u.all;
2677 m.dst.protonum = tuple->dst.protonum;
2679 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2681 goto nla_put_failure;
2684 ret = ctnetlink_dump_tuples_ip(skb, &m);
2686 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2687 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2691 if (unlikely(ret < 0))
2692 goto nla_put_failure;
2694 nla_nest_end(skb, nest_parms);
2702 static const union nf_inet_addr any_addr;
2704 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2706 static __read_mostly siphash_key_t exp_id_seed;
2707 unsigned long a, b, c, d;
2709 net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
2711 a = (unsigned long)exp;
2712 b = (unsigned long)exp->helper;
2713 c = (unsigned long)exp->master;
2714 d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
2717 return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
2719 return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
2724 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2725 const struct nf_conntrack_expect *exp)
2727 struct nf_conn *master = exp->master;
2728 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2729 struct nf_conn_help *help;
2730 #if IS_ENABLED(CONFIG_NF_NAT)
2731 struct nlattr *nest_parms;
2732 struct nf_conntrack_tuple nat_tuple = {};
2734 struct nf_ct_helper_expectfn *expfn;
2739 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2740 goto nla_put_failure;
2741 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2742 goto nla_put_failure;
2743 if (ctnetlink_exp_dump_tuple(skb,
2744 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2745 CTA_EXPECT_MASTER) < 0)
2746 goto nla_put_failure;
2748 #if IS_ENABLED(CONFIG_NF_NAT)
2749 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2750 exp->saved_proto.all) {
2751 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
2753 goto nla_put_failure;
2755 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2756 goto nla_put_failure;
2758 nat_tuple.src.l3num = nf_ct_l3num(master);
2759 nat_tuple.src.u3 = exp->saved_addr;
2760 nat_tuple.dst.protonum = nf_ct_protonum(master);
2761 nat_tuple.src.u = exp->saved_proto;
2763 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2764 CTA_EXPECT_NAT_TUPLE) < 0)
2765 goto nla_put_failure;
2766 nla_nest_end(skb, nest_parms);
2769 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2770 nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
2771 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2772 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2773 goto nla_put_failure;
2774 help = nfct_help(master);
2776 struct nf_conntrack_helper *helper;
2778 helper = rcu_dereference(help->helper);
2780 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2781 goto nla_put_failure;
2783 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2784 if (expfn != NULL &&
2785 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2786 goto nla_put_failure;
2795 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2796 int event, const struct nf_conntrack_expect *exp)
2798 struct nlmsghdr *nlh;
2799 struct nfgenmsg *nfmsg;
2800 unsigned int flags = portid ? NLM_F_MULTI : 0;
2802 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
2803 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2807 nfmsg = nlmsg_data(nlh);
2808 nfmsg->nfgen_family = exp->tuple.src.l3num;
2809 nfmsg->version = NFNETLINK_V0;
2812 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2813 goto nla_put_failure;
2815 nlmsg_end(skb, nlh);
2820 nlmsg_cancel(skb, nlh);
2824 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2826 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2828 struct nf_conntrack_expect *exp = item->exp;
2829 struct net *net = nf_ct_exp_net(exp);
2830 struct nlmsghdr *nlh;
2831 struct nfgenmsg *nfmsg;
2832 struct sk_buff *skb;
2833 unsigned int type, group;
2836 if (events & (1 << IPEXP_DESTROY)) {
2837 type = IPCTNL_MSG_EXP_DELETE;
2838 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2839 } else if (events & (1 << IPEXP_NEW)) {
2840 type = IPCTNL_MSG_EXP_NEW;
2841 flags = NLM_F_CREATE|NLM_F_EXCL;
2842 group = NFNLGRP_CONNTRACK_EXP_NEW;
2846 if (!item->report && !nfnetlink_has_listeners(net, group))
2849 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2853 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
2854 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2858 nfmsg = nlmsg_data(nlh);
2859 nfmsg->nfgen_family = exp->tuple.src.l3num;
2860 nfmsg->version = NFNETLINK_V0;
2863 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2864 goto nla_put_failure;
2866 nlmsg_end(skb, nlh);
2867 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2871 nlmsg_cancel(skb, nlh);
2875 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2879 static int ctnetlink_exp_done(struct netlink_callback *cb)
2882 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2887 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2889 struct net *net = sock_net(skb->sk);
2890 struct nf_conntrack_expect *exp, *last;
2891 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2892 u_int8_t l3proto = nfmsg->nfgen_family;
2895 last = (struct nf_conntrack_expect *)cb->args[1];
2896 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2898 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
2900 if (l3proto && exp->tuple.src.l3num != l3proto)
2903 if (!net_eq(nf_ct_net(exp->master), net))
2911 if (ctnetlink_exp_fill_info(skb,
2912 NETLINK_CB(cb->skb).portid,
2916 if (!refcount_inc_not_zero(&exp->use))
2918 cb->args[1] = (unsigned long)exp;
2930 nf_ct_expect_put(last);
2936 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2938 struct nf_conntrack_expect *exp, *last;
2939 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2940 struct nf_conn *ct = cb->data;
2941 struct nf_conn_help *help = nfct_help(ct);
2942 u_int8_t l3proto = nfmsg->nfgen_family;
2948 last = (struct nf_conntrack_expect *)cb->args[1];
2950 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
2951 if (l3proto && exp->tuple.src.l3num != l3proto)
2958 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2962 if (!refcount_inc_not_zero(&exp->use))
2964 cb->args[1] = (unsigned long)exp;
2976 nf_ct_expect_put(last);
2981 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
2982 struct sk_buff *skb,
2983 const struct nlmsghdr *nlh,
2984 const struct nlattr * const cda[],
2985 struct netlink_ext_ack *extack)
2988 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2989 u_int8_t u3 = nfmsg->nfgen_family;
2990 struct nf_conntrack_tuple tuple;
2991 struct nf_conntrack_tuple_hash *h;
2993 struct nf_conntrack_zone zone;
2994 struct netlink_dump_control c = {
2995 .dump = ctnetlink_exp_ct_dump_table,
2996 .done = ctnetlink_exp_done,
2999 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3004 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3008 h = nf_conntrack_find_get(net, &zone, &tuple);
3012 ct = nf_ct_tuplehash_to_ctrack(h);
3013 /* No expectation linked to this connection tracking. */
3014 if (!nfct_help(ct)) {
3021 err = netlink_dump_start(ctnl, skb, nlh, &c);
3027 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
3028 struct sk_buff *skb, const struct nlmsghdr *nlh,
3029 const struct nlattr * const cda[],
3030 struct netlink_ext_ack *extack)
3032 struct nf_conntrack_tuple tuple;
3033 struct nf_conntrack_expect *exp;
3034 struct sk_buff *skb2;
3035 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3036 u_int8_t u3 = nfmsg->nfgen_family;
3037 struct nf_conntrack_zone zone;
3040 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3041 if (cda[CTA_EXPECT_MASTER])
3042 return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda,
3045 struct netlink_dump_control c = {
3046 .dump = ctnetlink_exp_dump_table,
3047 .done = ctnetlink_exp_done,
3049 return netlink_dump_start(ctnl, skb, nlh, &c);
3053 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3057 if (cda[CTA_EXPECT_TUPLE])
3058 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3060 else if (cda[CTA_EXPECT_MASTER])
3061 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3069 exp = nf_ct_expect_find_get(net, &zone, &tuple);
3073 if (cda[CTA_EXPECT_ID]) {
3074 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3076 if (id != nf_expect_get_id(exp)) {
3077 nf_ct_expect_put(exp);
3083 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3085 nf_ct_expect_put(exp);
3090 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3091 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
3093 nf_ct_expect_put(exp);
3097 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
3106 /* this avoids a loop in nfnetlink. */
3107 return err == -EAGAIN ? -ENOBUFS : err;
3110 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3112 const struct nf_conn_help *m_help;
3113 const char *name = data;
3115 m_help = nfct_help(exp->master);
3117 return strcmp(m_help->helper->name, name) == 0;
3120 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3125 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
3126 struct sk_buff *skb, const struct nlmsghdr *nlh,
3127 const struct nlattr * const cda[],
3128 struct netlink_ext_ack *extack)
3130 struct nf_conntrack_expect *exp;
3131 struct nf_conntrack_tuple tuple;
3132 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3133 u_int8_t u3 = nfmsg->nfgen_family;
3134 struct nf_conntrack_zone zone;
3137 if (cda[CTA_EXPECT_TUPLE]) {
3138 /* delete a single expect by tuple */
3139 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3143 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3148 /* bump usage count to 2 */
3149 exp = nf_ct_expect_find_get(net, &zone, &tuple);
3153 if (cda[CTA_EXPECT_ID]) {
3154 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3155 if (ntohl(id) != (u32)(unsigned long)exp) {
3156 nf_ct_expect_put(exp);
3161 /* after list removal, usage count == 1 */
3162 spin_lock_bh(&nf_conntrack_expect_lock);
3163 if (del_timer(&exp->timeout)) {
3164 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3166 nf_ct_expect_put(exp);
3168 spin_unlock_bh(&nf_conntrack_expect_lock);
3169 /* have to put what we 'get' above.
3170 * after this line usage count == 0 */
3171 nf_ct_expect_put(exp);
3172 } else if (cda[CTA_EXPECT_HELP_NAME]) {
3173 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3175 nf_ct_expect_iterate_net(net, expect_iter_name, name,
3176 NETLINK_CB(skb).portid,
3179 /* This basically means we have to flush everything*/
3180 nf_ct_expect_iterate_net(net, expect_iter_all, NULL,
3181 NETLINK_CB(skb).portid,
3188 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3189 const struct nlattr * const cda[])
3191 if (cda[CTA_EXPECT_TIMEOUT]) {
3192 if (!del_timer(&x->timeout))
3195 x->timeout.expires = jiffies +
3196 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3197 add_timer(&x->timeout);
3202 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3203 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3204 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3208 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3209 struct nf_conntrack_expect *exp,
3212 #if IS_ENABLED(CONFIG_NF_NAT)
3213 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3214 struct nf_conntrack_tuple nat_tuple = {};
3217 err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3218 exp_nat_nla_policy, NULL);
3222 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3225 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3226 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3231 exp->saved_addr = nat_tuple.src.u3;
3232 exp->saved_proto = nat_tuple.src.u;
3233 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3241 static struct nf_conntrack_expect *
3242 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3243 struct nf_conntrack_helper *helper,
3244 struct nf_conntrack_tuple *tuple,
3245 struct nf_conntrack_tuple *mask)
3247 u_int32_t class = 0;
3248 struct nf_conntrack_expect *exp;
3249 struct nf_conn_help *help;
3252 help = nfct_help(ct);
3254 return ERR_PTR(-EOPNOTSUPP);
3256 if (cda[CTA_EXPECT_CLASS] && helper) {
3257 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3258 if (class > helper->expect_class_max)
3259 return ERR_PTR(-EINVAL);
3261 exp = nf_ct_expect_alloc(ct);
3263 return ERR_PTR(-ENOMEM);
3265 if (cda[CTA_EXPECT_FLAGS]) {
3266 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3267 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3271 if (cda[CTA_EXPECT_FN]) {
3272 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3273 struct nf_ct_helper_expectfn *expfn;
3275 expfn = nf_ct_helper_expectfn_find_by_name(name);
3276 if (expfn == NULL) {
3280 exp->expectfn = expfn->expectfn;
3282 exp->expectfn = NULL;
3286 exp->helper = helper;
3287 exp->tuple = *tuple;
3288 exp->mask.src.u3 = mask->src.u3;
3289 exp->mask.src.u.all = mask->src.u.all;
3291 if (cda[CTA_EXPECT_NAT]) {
3292 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3293 exp, nf_ct_l3num(ct));
3299 nf_ct_expect_put(exp);
3300 return ERR_PTR(err);
3304 ctnetlink_create_expect(struct net *net,
3305 const struct nf_conntrack_zone *zone,
3306 const struct nlattr * const cda[],
3307 u_int8_t u3, u32 portid, int report)
3309 struct nf_conntrack_tuple tuple, mask, master_tuple;
3310 struct nf_conntrack_tuple_hash *h = NULL;
3311 struct nf_conntrack_helper *helper = NULL;
3312 struct nf_conntrack_expect *exp;
3316 /* caller guarantees that those three CTA_EXPECT_* exist */
3317 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3321 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3325 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3330 /* Look for master conntrack of this expectation */
3331 h = nf_conntrack_find_get(net, zone, &master_tuple);
3334 ct = nf_ct_tuplehash_to_ctrack(h);
3337 if (cda[CTA_EXPECT_HELP_NAME]) {
3338 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3340 helper = __nf_conntrack_helper_find(helpname, u3,
3341 nf_ct_protonum(ct));
3342 if (helper == NULL) {
3344 #ifdef CONFIG_MODULES
3345 if (request_module("nfct-helper-%s", helpname) < 0) {
3350 helper = __nf_conntrack_helper_find(helpname, u3,
3351 nf_ct_protonum(ct));
3363 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3369 err = nf_ct_expect_related_report(exp, portid, report);
3370 nf_ct_expect_put(exp);
3378 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3379 struct sk_buff *skb, const struct nlmsghdr *nlh,
3380 const struct nlattr * const cda[],
3381 struct netlink_ext_ack *extack)
3383 struct nf_conntrack_tuple tuple;
3384 struct nf_conntrack_expect *exp;
3385 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3386 u_int8_t u3 = nfmsg->nfgen_family;
3387 struct nf_conntrack_zone zone;
3390 if (!cda[CTA_EXPECT_TUPLE]
3391 || !cda[CTA_EXPECT_MASK]
3392 || !cda[CTA_EXPECT_MASTER])
3395 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3399 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3404 spin_lock_bh(&nf_conntrack_expect_lock);
3405 exp = __nf_ct_expect_find(net, &zone, &tuple);
3407 spin_unlock_bh(&nf_conntrack_expect_lock);
3409 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3410 err = ctnetlink_create_expect(net, &zone, cda, u3,
3411 NETLINK_CB(skb).portid,
3418 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3419 err = ctnetlink_change_expect(exp, cda);
3420 spin_unlock_bh(&nf_conntrack_expect_lock);
3426 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3427 const struct ip_conntrack_stat *st)
3429 struct nlmsghdr *nlh;
3430 struct nfgenmsg *nfmsg;
3431 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3433 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3434 IPCTNL_MSG_EXP_GET_STATS_CPU);
3435 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3439 nfmsg = nlmsg_data(nlh);
3440 nfmsg->nfgen_family = AF_UNSPEC;
3441 nfmsg->version = NFNETLINK_V0;
3442 nfmsg->res_id = htons(cpu);
3444 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3445 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3446 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3447 goto nla_put_failure;
3449 nlmsg_end(skb, nlh);
3454 nlmsg_cancel(skb, nlh);
3459 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3462 struct net *net = sock_net(skb->sk);
3464 if (cb->args[0] == nr_cpu_ids)
3467 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3468 const struct ip_conntrack_stat *st;
3470 if (!cpu_possible(cpu))
3473 st = per_cpu_ptr(net->ct.stat, cpu);
3474 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3484 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3485 struct sk_buff *skb,
3486 const struct nlmsghdr *nlh,
3487 const struct nlattr * const cda[],
3488 struct netlink_ext_ack *extack)
3490 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3491 struct netlink_dump_control c = {
3492 .dump = ctnetlink_exp_stat_cpu_dump,
3494 return netlink_dump_start(ctnl, skb, nlh, &c);
3500 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3501 static struct nf_ct_event_notifier ctnl_notifier = {
3502 .fcn = ctnetlink_conntrack_event,
3505 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3506 .fcn = ctnetlink_expect_event,
3510 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3511 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3512 .attr_count = CTA_MAX,
3513 .policy = ct_nla_policy },
3514 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3515 .attr_count = CTA_MAX,
3516 .policy = ct_nla_policy },
3517 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3518 .attr_count = CTA_MAX,
3519 .policy = ct_nla_policy },
3520 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3521 .attr_count = CTA_MAX,
3522 .policy = ct_nla_policy },
3523 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3524 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3525 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3526 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3529 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3530 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3531 .attr_count = CTA_EXPECT_MAX,
3532 .policy = exp_nla_policy },
3533 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3534 .attr_count = CTA_EXPECT_MAX,
3535 .policy = exp_nla_policy },
3536 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3537 .attr_count = CTA_EXPECT_MAX,
3538 .policy = exp_nla_policy },
3539 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3542 static const struct nfnetlink_subsystem ctnl_subsys = {
3543 .name = "conntrack",
3544 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3545 .cb_count = IPCTNL_MSG_MAX,
3549 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3550 .name = "conntrack_expect",
3551 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3552 .cb_count = IPCTNL_MSG_EXP_MAX,
3556 MODULE_ALIAS("ip_conntrack_netlink");
3557 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3558 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3560 static int __net_init ctnetlink_net_init(struct net *net)
3562 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3565 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3567 pr_err("ctnetlink_init: cannot register notifier.\n");
3571 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3573 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3574 goto err_unreg_notifier;
3579 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3581 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3587 static void ctnetlink_net_exit(struct net *net)
3589 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3590 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3591 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3595 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3599 list_for_each_entry(net, net_exit_list, exit_list)
3600 ctnetlink_net_exit(net);
3603 static struct pernet_operations ctnetlink_net_ops = {
3604 .init = ctnetlink_net_init,
3605 .exit_batch = ctnetlink_net_exit_batch,
3608 static int __init ctnetlink_init(void)
3612 ret = nfnetlink_subsys_register(&ctnl_subsys);
3614 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3618 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3620 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3621 goto err_unreg_subsys;
3624 ret = register_pernet_subsys(&ctnetlink_net_ops);
3626 pr_err("ctnetlink_init: cannot register pernet operations\n");
3627 goto err_unreg_exp_subsys;
3629 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3630 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3631 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3635 err_unreg_exp_subsys:
3636 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3638 nfnetlink_subsys_unregister(&ctnl_subsys);
3643 static void __exit ctnetlink_exit(void)
3645 unregister_pernet_subsys(&ctnetlink_net_ops);
3646 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3647 nfnetlink_subsys_unregister(&ctnl_subsys);
3648 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3649 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3654 module_init(ctnetlink_init);
3655 module_exit(ctnetlink_exit);