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_acct(skb, ct, type) < 0 ||
557 ctnetlink_dump_timestamp(skb, ct) < 0 ||
558 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
559 ctnetlink_dump_mark(skb, ct) < 0 ||
560 ctnetlink_dump_secctx(skb, ct) < 0 ||
561 ctnetlink_dump_labels(skb, ct) < 0 ||
562 ctnetlink_dump_id(skb, ct) < 0 ||
563 ctnetlink_dump_use(skb, ct) < 0 ||
564 ctnetlink_dump_master(skb, ct) < 0 ||
565 ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
566 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
567 goto nla_put_failure;
569 if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
570 (ctnetlink_dump_timeout(skb, ct) < 0 ||
571 ctnetlink_dump_protoinfo(skb, ct) < 0))
572 goto nla_put_failure;
579 nlmsg_cancel(skb, nlh);
583 static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
584 [CTA_IP_V4_SRC] = { .type = NLA_U32 },
585 [CTA_IP_V4_DST] = { .type = NLA_U32 },
586 [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
587 [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
590 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
591 static size_t ctnetlink_proto_size(const struct nf_conn *ct)
593 const struct nf_conntrack_l4proto *l4proto;
594 size_t len, len4 = 0;
596 len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
597 len *= 3u; /* ORIG, REPLY, MASTER */
599 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
600 len += l4proto->nlattr_size;
601 if (l4proto->nlattr_tuple_size) {
602 len4 = l4proto->nlattr_tuple_size();
603 len4 *= 3u; /* ORIG, REPLY, MASTER */
610 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
612 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
614 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
615 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
616 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
620 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
622 #ifdef CONFIG_NF_CONNTRACK_SECMARK
625 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
629 return nla_total_size(0) /* CTA_SECCTX */
630 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
636 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
638 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
639 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
641 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
647 #ifdef CONFIG_NF_CONNTRACK_EVENTS
648 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
650 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
651 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
652 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
653 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
654 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
655 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
656 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
657 + ctnetlink_acct_size(ct)
658 + ctnetlink_timestamp_size(ct)
659 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
660 + nla_total_size(0) /* CTA_PROTOINFO */
661 + nla_total_size(0) /* CTA_HELP */
662 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
663 + ctnetlink_secctx_size(ct)
664 #if IS_ENABLED(CONFIG_NF_NAT)
665 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
666 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
668 #ifdef CONFIG_NF_CONNTRACK_MARK
669 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
671 #ifdef CONFIG_NF_CONNTRACK_ZONES
672 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
674 + ctnetlink_proto_size(ct)
675 + ctnetlink_label_size(ct)
680 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
682 const struct nf_conntrack_zone *zone;
684 struct nlmsghdr *nlh;
685 struct nfgenmsg *nfmsg;
686 struct nlattr *nest_parms;
687 struct nf_conn *ct = item->ct;
690 unsigned int flags = 0, group;
693 if (events & (1 << IPCT_DESTROY)) {
694 type = IPCTNL_MSG_CT_DELETE;
695 group = NFNLGRP_CONNTRACK_DESTROY;
696 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
697 type = IPCTNL_MSG_CT_NEW;
698 flags = NLM_F_CREATE|NLM_F_EXCL;
699 group = NFNLGRP_CONNTRACK_NEW;
701 type = IPCTNL_MSG_CT_NEW;
702 group = NFNLGRP_CONNTRACK_UPDATE;
707 if (!item->report && !nfnetlink_has_listeners(net, group))
710 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
714 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
715 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
719 nfmsg = nlmsg_data(nlh);
720 nfmsg->nfgen_family = nf_ct_l3num(ct);
721 nfmsg->version = NFNETLINK_V0;
724 zone = nf_ct_zone(ct);
726 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
728 goto nla_put_failure;
729 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
730 goto nla_put_failure;
731 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
732 NF_CT_ZONE_DIR_ORIG) < 0)
733 goto nla_put_failure;
734 nla_nest_end(skb, nest_parms);
736 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
738 goto nla_put_failure;
739 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
740 goto nla_put_failure;
741 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
742 NF_CT_ZONE_DIR_REPL) < 0)
743 goto nla_put_failure;
744 nla_nest_end(skb, nest_parms);
746 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
747 NF_CT_DEFAULT_ZONE_DIR) < 0)
748 goto nla_put_failure;
750 if (ctnetlink_dump_id(skb, ct) < 0)
751 goto nla_put_failure;
753 if (ctnetlink_dump_status(skb, ct) < 0)
754 goto nla_put_failure;
756 if (events & (1 << IPCT_DESTROY)) {
757 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
758 ctnetlink_dump_timestamp(skb, ct) < 0)
759 goto nla_put_failure;
761 if (ctnetlink_dump_timeout(skb, ct) < 0)
762 goto nla_put_failure;
764 if (events & (1 << IPCT_PROTOINFO)
765 && ctnetlink_dump_protoinfo(skb, ct) < 0)
766 goto nla_put_failure;
768 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
769 && ctnetlink_dump_helpinfo(skb, ct) < 0)
770 goto nla_put_failure;
772 #ifdef CONFIG_NF_CONNTRACK_SECMARK
773 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
774 && ctnetlink_dump_secctx(skb, ct) < 0)
775 goto nla_put_failure;
777 if (events & (1 << IPCT_LABEL) &&
778 ctnetlink_dump_labels(skb, ct) < 0)
779 goto nla_put_failure;
781 if (events & (1 << IPCT_RELATED) &&
782 ctnetlink_dump_master(skb, ct) < 0)
783 goto nla_put_failure;
785 if (events & (1 << IPCT_SEQADJ) &&
786 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
787 goto nla_put_failure;
789 if (events & (1 << IPCT_SYNPROXY) &&
790 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
791 goto nla_put_failure;
794 #ifdef CONFIG_NF_CONNTRACK_MARK
795 if ((events & (1 << IPCT_MARK) || ct->mark)
796 && ctnetlink_dump_mark(skb, ct) < 0)
797 goto nla_put_failure;
800 err = nfnetlink_send(skb, net, item->portid, group, item->report,
802 if (err == -ENOBUFS || err == -EAGAIN)
808 nlmsg_cancel(skb, nlh);
812 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
817 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
819 static int ctnetlink_done(struct netlink_callback *cb)
822 nf_ct_put((struct nf_conn *)cb->args[1]);
827 struct ctnetlink_filter {
835 static struct ctnetlink_filter *
836 ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
838 struct ctnetlink_filter *filter;
840 #ifndef CONFIG_NF_CONNTRACK_MARK
841 if (cda[CTA_MARK] && cda[CTA_MARK_MASK])
842 return ERR_PTR(-EOPNOTSUPP);
845 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
847 return ERR_PTR(-ENOMEM);
849 filter->family = family;
851 #ifdef CONFIG_NF_CONNTRACK_MARK
852 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
853 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
854 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
860 static int ctnetlink_start(struct netlink_callback *cb)
862 const struct nlattr * const *cda = cb->data;
863 struct ctnetlink_filter *filter = NULL;
864 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
865 u8 family = nfmsg->nfgen_family;
867 if (family || (cda[CTA_MARK] && cda[CTA_MARK_MASK])) {
868 filter = ctnetlink_alloc_filter(cda, family);
870 return PTR_ERR(filter);
877 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
879 struct ctnetlink_filter *filter = data;
884 /* Match entries of a given L3 protocol number.
885 * If it is not specified, ie. l3proto == 0,
886 * then match everything.
888 if (filter->family && nf_ct_l3num(ct) != filter->family)
891 #ifdef CONFIG_NF_CONNTRACK_MARK
892 if ((ct->mark & filter->mark.mask) != filter->mark.val)
904 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
906 struct net *net = sock_net(skb->sk);
907 struct nf_conn *ct, *last;
908 struct nf_conntrack_tuple_hash *h;
909 struct hlist_nulls_node *n;
910 struct nf_conn *nf_ct_evict[8];
914 last = (struct nf_conn *)cb->args[1];
918 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
922 if (nf_ct_should_gc(nf_ct_evict[i]))
923 nf_ct_kill(nf_ct_evict[i]);
924 nf_ct_put(nf_ct_evict[i]);
927 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
928 nf_conntrack_lock(lockp);
929 if (cb->args[0] >= nf_conntrack_htable_size) {
933 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
935 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
937 ct = nf_ct_tuplehash_to_ctrack(h);
938 if (nf_ct_is_expired(ct)) {
939 if (i < ARRAY_SIZE(nf_ct_evict) &&
940 atomic_inc_not_zero(&ct->ct_general.use))
941 nf_ct_evict[i++] = ct;
945 if (!net_eq(net, nf_ct_net(ct)))
953 if (!ctnetlink_filter_match(ct, cb->data))
958 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
960 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
964 nf_conntrack_get(&ct->ct_general);
965 cb->args[1] = (unsigned long)ct;
979 /* nf ct hash resize happened, now clear the leftover. */
980 if ((struct nf_conn *)cb->args[1] == last)
988 if (nf_ct_should_gc(nf_ct_evict[i]))
989 nf_ct_kill(nf_ct_evict[i]);
990 nf_ct_put(nf_ct_evict[i]);
996 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
997 struct nf_conntrack_tuple *t)
999 if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST])
1002 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1003 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1008 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1009 struct nf_conntrack_tuple *t)
1011 if (!tb[CTA_IP_V6_SRC] || !tb[CTA_IP_V6_DST])
1014 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1015 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1020 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1021 struct nf_conntrack_tuple *tuple)
1023 struct nlattr *tb[CTA_IP_MAX+1];
1026 ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
1030 ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
1031 cta_ip_nla_policy, NULL);
1035 switch (tuple->src.l3num) {
1037 ret = ipv4_nlattr_to_tuple(tb, tuple);
1040 ret = ipv6_nlattr_to_tuple(tb, tuple);
1047 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1048 [CTA_PROTO_NUM] = { .type = NLA_U8 },
1051 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1052 struct nf_conntrack_tuple *tuple)
1054 const struct nf_conntrack_l4proto *l4proto;
1055 struct nlattr *tb[CTA_PROTO_MAX+1];
1058 ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1059 proto_nla_policy, NULL);
1063 if (!tb[CTA_PROTO_NUM])
1065 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1068 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1070 if (likely(l4proto->nlattr_to_tuple)) {
1071 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1072 l4proto->nla_policy,
1075 ret = l4proto->nlattr_to_tuple(tb, tuple);
1084 ctnetlink_parse_zone(const struct nlattr *attr,
1085 struct nf_conntrack_zone *zone)
1087 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1088 NF_CT_DEFAULT_ZONE_DIR, 0);
1089 #ifdef CONFIG_NF_CONNTRACK_ZONES
1091 zone->id = ntohs(nla_get_be16(attr));
1100 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1101 struct nf_conntrack_zone *zone)
1105 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1108 ret = ctnetlink_parse_zone(attr, zone);
1112 if (type == CTA_TUPLE_REPLY)
1113 zone->dir = NF_CT_ZONE_DIR_REPL;
1115 zone->dir = NF_CT_ZONE_DIR_ORIG;
1120 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1121 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1122 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1123 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1127 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1128 struct nf_conntrack_tuple *tuple, u32 type,
1129 u_int8_t l3num, struct nf_conntrack_zone *zone)
1131 struct nlattr *tb[CTA_TUPLE_MAX+1];
1134 memset(tuple, 0, sizeof(*tuple));
1136 err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1137 tuple_nla_policy, NULL);
1141 if (!tb[CTA_TUPLE_IP])
1144 tuple->src.l3num = l3num;
1146 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
1150 if (!tb[CTA_TUPLE_PROTO])
1153 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
1157 if (tb[CTA_TUPLE_ZONE]) {
1161 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1167 /* orig and expect tuples get DIR_ORIGINAL */
1168 if (type == CTA_TUPLE_REPLY)
1169 tuple->dst.dir = IP_CT_DIR_REPLY;
1171 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1176 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1177 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1178 .len = NF_CT_HELPER_NAME_LEN - 1 },
1181 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1182 struct nlattr **helpinfo)
1185 struct nlattr *tb[CTA_HELP_MAX+1];
1187 err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1188 help_nla_policy, NULL);
1192 if (!tb[CTA_HELP_NAME])
1195 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1197 if (tb[CTA_HELP_INFO])
1198 *helpinfo = tb[CTA_HELP_INFO];
1203 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1204 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1205 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1206 [CTA_STATUS] = { .type = NLA_U32 },
1207 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1208 [CTA_HELP] = { .type = NLA_NESTED },
1209 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1210 [CTA_TIMEOUT] = { .type = NLA_U32 },
1211 [CTA_MARK] = { .type = NLA_U32 },
1212 [CTA_ID] = { .type = NLA_U32 },
1213 [CTA_NAT_DST] = { .type = NLA_NESTED },
1214 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1215 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1216 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1217 [CTA_ZONE] = { .type = NLA_U16 },
1218 [CTA_MARK_MASK] = { .type = NLA_U32 },
1219 [CTA_LABELS] = { .type = NLA_BINARY,
1220 .len = NF_CT_LABELS_MAX_SIZE },
1221 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1222 .len = NF_CT_LABELS_MAX_SIZE },
1225 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1227 if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1230 return ctnetlink_filter_match(ct, data);
1233 static int ctnetlink_flush_conntrack(struct net *net,
1234 const struct nlattr * const cda[],
1235 u32 portid, int report, u8 family)
1237 struct ctnetlink_filter *filter = NULL;
1239 if (family || (cda[CTA_MARK] && cda[CTA_MARK_MASK])) {
1240 filter = ctnetlink_alloc_filter(cda, family);
1242 return PTR_ERR(filter);
1245 nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
1252 static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1253 struct sk_buff *skb,
1254 const struct nlmsghdr *nlh,
1255 const struct nlattr * const cda[],
1256 struct netlink_ext_ack *extack)
1258 struct nf_conntrack_tuple_hash *h;
1259 struct nf_conntrack_tuple tuple;
1261 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1262 struct nf_conntrack_zone zone;
1265 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1269 if (cda[CTA_TUPLE_ORIG])
1270 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1271 nfmsg->nfgen_family, &zone);
1272 else if (cda[CTA_TUPLE_REPLY])
1273 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1274 nfmsg->nfgen_family, &zone);
1276 u_int8_t u3 = nfmsg->version ? nfmsg->nfgen_family : AF_UNSPEC;
1278 return ctnetlink_flush_conntrack(net, cda,
1279 NETLINK_CB(skb).portid,
1280 nlmsg_report(nlh), u3);
1286 h = nf_conntrack_find_get(net, &zone, &tuple);
1290 ct = nf_ct_tuplehash_to_ctrack(h);
1292 if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1298 __be32 id = nla_get_be32(cda[CTA_ID]);
1300 if (id != (__force __be32)nf_ct_get_id(ct)) {
1306 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1312 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1313 struct sk_buff *skb,
1314 const struct nlmsghdr *nlh,
1315 const struct nlattr * const cda[],
1316 struct netlink_ext_ack *extack)
1318 struct nf_conntrack_tuple_hash *h;
1319 struct nf_conntrack_tuple tuple;
1321 struct sk_buff *skb2 = NULL;
1322 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1323 u_int8_t u3 = nfmsg->nfgen_family;
1324 struct nf_conntrack_zone zone;
1327 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1328 struct netlink_dump_control c = {
1329 .start = ctnetlink_start,
1330 .dump = ctnetlink_dump_table,
1331 .done = ctnetlink_done,
1332 .data = (void *)cda,
1335 return netlink_dump_start(ctnl, skb, nlh, &c);
1338 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1342 if (cda[CTA_TUPLE_ORIG])
1343 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1345 else if (cda[CTA_TUPLE_REPLY])
1346 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1354 h = nf_conntrack_find_get(net, &zone, &tuple);
1358 ct = nf_ct_tuplehash_to_ctrack(h);
1361 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1368 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1369 NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1375 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1384 /* this avoids a loop in nfnetlink. */
1385 return err == -EAGAIN ? -ENOBUFS : err;
1388 static int ctnetlink_done_list(struct netlink_callback *cb)
1391 nf_ct_put((struct nf_conn *)cb->args[1]);
1396 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1398 struct nf_conn *ct, *last;
1399 struct nf_conntrack_tuple_hash *h;
1400 struct hlist_nulls_node *n;
1401 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1402 u_int8_t l3proto = nfmsg->nfgen_family;
1405 struct hlist_nulls_head *list;
1406 struct net *net = sock_net(skb->sk);
1411 last = (struct nf_conn *)cb->args[1];
1413 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1414 struct ct_pcpu *pcpu;
1416 if (!cpu_possible(cpu))
1419 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1420 spin_lock_bh(&pcpu->lock);
1421 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1423 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1424 ct = nf_ct_tuplehash_to_ctrack(h);
1425 if (l3proto && nf_ct_l3num(ct) != l3proto)
1433 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1435 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1439 if (!atomic_inc_not_zero(&ct->ct_general.use))
1442 cb->args[1] = (unsigned long)ct;
1443 spin_unlock_bh(&pcpu->lock);
1451 spin_unlock_bh(&pcpu->lock);
1462 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1464 return ctnetlink_dump_list(skb, cb, true);
1467 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1468 struct sk_buff *skb,
1469 const struct nlmsghdr *nlh,
1470 const struct nlattr * const cda[],
1471 struct netlink_ext_ack *extack)
1473 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1474 struct netlink_dump_control c = {
1475 .dump = ctnetlink_dump_dying,
1476 .done = ctnetlink_done_list,
1478 return netlink_dump_start(ctnl, skb, nlh, &c);
1485 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1487 return ctnetlink_dump_list(skb, cb, false);
1490 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1491 struct sk_buff *skb,
1492 const struct nlmsghdr *nlh,
1493 const struct nlattr * const cda[],
1494 struct netlink_ext_ack *extack)
1496 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1497 struct netlink_dump_control c = {
1498 .dump = ctnetlink_dump_unconfirmed,
1499 .done = ctnetlink_done_list,
1501 return netlink_dump_start(ctnl, skb, nlh, &c);
1507 #if IS_ENABLED(CONFIG_NF_NAT)
1509 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1510 enum nf_nat_manip_type manip,
1511 const struct nlattr *attr)
1513 struct nf_nat_hook *nat_hook;
1516 nat_hook = rcu_dereference(nf_nat_hook);
1518 #ifdef CONFIG_MODULES
1520 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1521 if (request_module("nf-nat") < 0) {
1522 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1526 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1528 nat_hook = rcu_dereference(nf_nat_hook);
1535 err = nat_hook->parse_nat_setup(ct, manip, attr);
1536 if (err == -EAGAIN) {
1537 #ifdef CONFIG_MODULES
1539 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1540 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1541 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1545 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1556 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1561 /* Ignore these unchangable bits */
1562 on &= ~IPS_UNCHANGEABLE_MASK;
1563 off &= ~IPS_UNCHANGEABLE_MASK;
1565 for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1566 if (on & (1 << bit))
1567 set_bit(bit, &ct->status);
1568 else if (off & (1 << bit))
1569 clear_bit(bit, &ct->status);
1574 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1577 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1578 d = ct->status ^ status;
1580 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1584 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1585 /* SEEN_REPLY bit can only be set */
1588 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1589 /* ASSURED bit can only be set */
1592 __ctnetlink_change_status(ct, status, 0);
1597 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1599 #if IS_ENABLED(CONFIG_NF_NAT)
1602 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1605 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1610 return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1613 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1619 static int ctnetlink_change_helper(struct nf_conn *ct,
1620 const struct nlattr * const cda[])
1622 struct nf_conntrack_helper *helper;
1623 struct nf_conn_help *help = nfct_help(ct);
1624 char *helpname = NULL;
1625 struct nlattr *helpinfo = NULL;
1628 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1632 /* don't change helper of sibling connections */
1634 /* If we try to change the helper to the same thing twice,
1635 * treat the second attempt as a no-op instead of returning
1641 helper = rcu_dereference(help->helper);
1642 if (helper && !strcmp(helper->name, helpname))
1650 if (!strcmp(helpname, "")) {
1651 if (help && help->helper) {
1652 /* we had a helper before ... */
1653 nf_ct_remove_expectations(ct);
1654 RCU_INIT_POINTER(help->helper, NULL);
1661 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1662 nf_ct_protonum(ct));
1663 if (helper == NULL) {
1669 if (help->helper == helper) {
1670 /* update private helper data if allowed. */
1671 if (helper->from_nlattr)
1672 helper->from_nlattr(helpinfo, ct);
1677 /* we cannot set a helper for an existing conntrack */
1685 static int ctnetlink_change_timeout(struct nf_conn *ct,
1686 const struct nlattr * const cda[])
1688 u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1690 if (timeout > INT_MAX)
1692 ct->timeout = nfct_time_stamp + (u32)timeout;
1694 if (test_bit(IPS_DYING_BIT, &ct->status))
1700 #if defined(CONFIG_NF_CONNTRACK_MARK)
1701 static void ctnetlink_change_mark(struct nf_conn *ct,
1702 const struct nlattr * const cda[])
1704 u32 mark, newmark, mask = 0;
1706 if (cda[CTA_MARK_MASK])
1707 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1709 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1710 newmark = (ct->mark & mask) ^ mark;
1711 if (newmark != ct->mark)
1716 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1717 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1718 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1719 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1722 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
1723 const struct nlattr * const cda[])
1725 const struct nlattr *attr = cda[CTA_PROTOINFO];
1726 const struct nf_conntrack_l4proto *l4proto;
1727 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1730 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
1731 protoinfo_policy, NULL);
1735 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
1736 if (l4proto->from_nlattr)
1737 err = l4proto->from_nlattr(tb, ct);
1742 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1743 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
1744 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
1745 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
1748 static int change_seq_adj(struct nf_ct_seqadj *seq,
1749 const struct nlattr * const attr)
1752 struct nlattr *cda[CTA_SEQADJ_MAX+1];
1754 err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
1755 seqadj_policy, NULL);
1759 if (!cda[CTA_SEQADJ_CORRECTION_POS])
1762 seq->correction_pos =
1763 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1765 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1768 seq->offset_before =
1769 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1771 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1775 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1781 ctnetlink_change_seq_adj(struct nf_conn *ct,
1782 const struct nlattr * const cda[])
1784 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1790 spin_lock_bh(&ct->lock);
1791 if (cda[CTA_SEQ_ADJ_ORIG]) {
1792 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1793 cda[CTA_SEQ_ADJ_ORIG]);
1797 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1800 if (cda[CTA_SEQ_ADJ_REPLY]) {
1801 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1802 cda[CTA_SEQ_ADJ_REPLY]);
1806 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1809 spin_unlock_bh(&ct->lock);
1812 spin_unlock_bh(&ct->lock);
1816 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
1817 [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
1818 [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
1819 [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
1822 static int ctnetlink_change_synproxy(struct nf_conn *ct,
1823 const struct nlattr * const cda[])
1825 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
1826 struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
1832 err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
1833 cda[CTA_SYNPROXY], synproxy_policy,
1838 if (!tb[CTA_SYNPROXY_ISN] ||
1839 !tb[CTA_SYNPROXY_ITS] ||
1840 !tb[CTA_SYNPROXY_TSOFF])
1843 synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
1844 synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
1845 synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
1851 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1853 #ifdef CONFIG_NF_CONNTRACK_LABELS
1854 size_t len = nla_len(cda[CTA_LABELS]);
1855 const void *mask = cda[CTA_LABELS_MASK];
1857 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1861 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1862 nla_len(cda[CTA_LABELS_MASK]) != len)
1864 mask = nla_data(cda[CTA_LABELS_MASK]);
1869 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1876 ctnetlink_change_conntrack(struct nf_conn *ct,
1877 const struct nlattr * const cda[])
1881 /* only allow NAT changes and master assignation for new conntracks */
1882 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1885 if (cda[CTA_HELP]) {
1886 err = ctnetlink_change_helper(ct, cda);
1891 if (cda[CTA_TIMEOUT]) {
1892 err = ctnetlink_change_timeout(ct, cda);
1897 if (cda[CTA_STATUS]) {
1898 err = ctnetlink_change_status(ct, cda);
1903 if (cda[CTA_PROTOINFO]) {
1904 err = ctnetlink_change_protoinfo(ct, cda);
1909 #if defined(CONFIG_NF_CONNTRACK_MARK)
1911 ctnetlink_change_mark(ct, cda);
1914 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1915 err = ctnetlink_change_seq_adj(ct, cda);
1920 if (cda[CTA_SYNPROXY]) {
1921 err = ctnetlink_change_synproxy(ct, cda);
1926 if (cda[CTA_LABELS]) {
1927 err = ctnetlink_attach_labels(ct, cda);
1935 static struct nf_conn *
1936 ctnetlink_create_conntrack(struct net *net,
1937 const struct nf_conntrack_zone *zone,
1938 const struct nlattr * const cda[],
1939 struct nf_conntrack_tuple *otuple,
1940 struct nf_conntrack_tuple *rtuple,
1945 struct nf_conntrack_helper *helper;
1946 struct nf_conn_tstamp *tstamp;
1949 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1951 return ERR_PTR(-ENOMEM);
1953 if (!cda[CTA_TIMEOUT])
1956 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1957 if (timeout > INT_MAX)
1959 ct->timeout = (u32)timeout + nfct_time_stamp;
1962 if (cda[CTA_HELP]) {
1963 char *helpname = NULL;
1964 struct nlattr *helpinfo = NULL;
1966 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1970 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1971 nf_ct_protonum(ct));
1972 if (helper == NULL) {
1974 #ifdef CONFIG_MODULES
1975 if (request_module("nfct-helper-%s", helpname) < 0) {
1981 helper = __nf_conntrack_helper_find(helpname,
1983 nf_ct_protonum(ct));
1993 struct nf_conn_help *help;
1995 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2000 /* set private helper data if allowed. */
2001 if (helper->from_nlattr)
2002 helper->from_nlattr(helpinfo, ct);
2004 /* not in hash table yet so not strictly necessary */
2005 RCU_INIT_POINTER(help->helper, helper);
2008 /* try an implicit helper assignation */
2009 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
2014 err = ctnetlink_setup_nat(ct, cda);
2018 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2019 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2020 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2021 nf_ct_labels_ext_add(ct);
2022 nfct_seqadj_ext_add(ct);
2023 nfct_synproxy_ext_add(ct);
2025 /* we must add conntrack extensions before confirmation. */
2026 ct->status |= IPS_CONFIRMED;
2028 if (cda[CTA_STATUS]) {
2029 err = ctnetlink_change_status(ct, cda);
2034 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2035 err = ctnetlink_change_seq_adj(ct, cda);
2040 memset(&ct->proto, 0, sizeof(ct->proto));
2041 if (cda[CTA_PROTOINFO]) {
2042 err = ctnetlink_change_protoinfo(ct, cda);
2047 if (cda[CTA_SYNPROXY]) {
2048 err = ctnetlink_change_synproxy(ct, cda);
2053 #if defined(CONFIG_NF_CONNTRACK_MARK)
2055 ctnetlink_change_mark(ct, cda);
2058 /* setup master conntrack: this is a confirmed expectation */
2059 if (cda[CTA_TUPLE_MASTER]) {
2060 struct nf_conntrack_tuple master;
2061 struct nf_conntrack_tuple_hash *master_h;
2062 struct nf_conn *master_ct;
2064 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2069 master_h = nf_conntrack_find_get(net, zone, &master);
2070 if (master_h == NULL) {
2074 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2075 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2076 ct->master = master_ct;
2078 tstamp = nf_conn_tstamp_find(ct);
2080 tstamp->start = ktime_get_real_ns();
2082 err = nf_conntrack_hash_check_insert(ct);
2093 nf_conntrack_free(ct);
2094 return ERR_PTR(err);
2097 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
2098 struct sk_buff *skb,
2099 const struct nlmsghdr *nlh,
2100 const struct nlattr * const cda[],
2101 struct netlink_ext_ack *extack)
2103 struct nf_conntrack_tuple otuple, rtuple;
2104 struct nf_conntrack_tuple_hash *h = NULL;
2105 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2107 u_int8_t u3 = nfmsg->nfgen_family;
2108 struct nf_conntrack_zone zone;
2111 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2115 if (cda[CTA_TUPLE_ORIG]) {
2116 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2122 if (cda[CTA_TUPLE_REPLY]) {
2123 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2129 if (cda[CTA_TUPLE_ORIG])
2130 h = nf_conntrack_find_get(net, &zone, &otuple);
2131 else if (cda[CTA_TUPLE_REPLY])
2132 h = nf_conntrack_find_get(net, &zone, &rtuple);
2136 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2137 enum ip_conntrack_events events;
2139 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2141 if (otuple.dst.protonum != rtuple.dst.protonum)
2144 ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
2150 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2151 events = 1 << IPCT_RELATED;
2153 events = 1 << IPCT_NEW;
2155 if (cda[CTA_LABELS] &&
2156 ctnetlink_attach_labels(ct, cda) == 0)
2157 events |= (1 << IPCT_LABEL);
2159 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2160 (1 << IPCT_ASSURED) |
2161 (1 << IPCT_HELPER) |
2162 (1 << IPCT_PROTOINFO) |
2163 (1 << IPCT_SEQADJ) |
2165 (1 << IPCT_SYNPROXY) |
2167 ct, NETLINK_CB(skb).portid,
2174 /* implicit 'else' */
2177 ct = nf_ct_tuplehash_to_ctrack(h);
2178 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
2179 err = ctnetlink_change_conntrack(ct, cda);
2181 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2182 (1 << IPCT_ASSURED) |
2183 (1 << IPCT_HELPER) |
2185 (1 << IPCT_PROTOINFO) |
2186 (1 << IPCT_SEQADJ) |
2188 (1 << IPCT_SYNPROXY),
2189 ct, NETLINK_CB(skb).portid,
2199 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2200 __u16 cpu, const struct ip_conntrack_stat *st)
2202 struct nlmsghdr *nlh;
2203 struct nfgenmsg *nfmsg;
2204 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2206 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2207 IPCTNL_MSG_CT_GET_STATS_CPU);
2208 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2212 nfmsg = nlmsg_data(nlh);
2213 nfmsg->nfgen_family = AF_UNSPEC;
2214 nfmsg->version = NFNETLINK_V0;
2215 nfmsg->res_id = htons(cpu);
2217 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2218 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2219 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
2220 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2221 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2222 htonl(st->insert_failed)) ||
2223 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2224 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2225 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2226 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2227 htonl(st->search_restart)))
2228 goto nla_put_failure;
2230 nlmsg_end(skb, nlh);
2235 nlmsg_cancel(skb, nlh);
2240 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2243 struct net *net = sock_net(skb->sk);
2245 if (cb->args[0] == nr_cpu_ids)
2248 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2249 const struct ip_conntrack_stat *st;
2251 if (!cpu_possible(cpu))
2254 st = per_cpu_ptr(net->ct.stat, cpu);
2255 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2256 NETLINK_CB(cb->skb).portid,
2266 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2267 struct sk_buff *skb,
2268 const struct nlmsghdr *nlh,
2269 const struct nlattr * const cda[],
2270 struct netlink_ext_ack *extack)
2272 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2273 struct netlink_dump_control c = {
2274 .dump = ctnetlink_ct_stat_cpu_dump,
2276 return netlink_dump_start(ctnl, skb, nlh, &c);
2283 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2286 struct nlmsghdr *nlh;
2287 struct nfgenmsg *nfmsg;
2288 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2289 unsigned int nr_conntracks = atomic_read(&net->ct.count);
2291 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2292 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2296 nfmsg = nlmsg_data(nlh);
2297 nfmsg->nfgen_family = AF_UNSPEC;
2298 nfmsg->version = NFNETLINK_V0;
2301 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2302 goto nla_put_failure;
2304 if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2305 goto nla_put_failure;
2307 nlmsg_end(skb, nlh);
2312 nlmsg_cancel(skb, nlh);
2316 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2317 struct sk_buff *skb, const struct nlmsghdr *nlh,
2318 const struct nlattr * const cda[],
2319 struct netlink_ext_ack *extack)
2321 struct sk_buff *skb2;
2324 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2328 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2330 NFNL_MSG_TYPE(nlh->nlmsg_type),
2335 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2344 /* this avoids a loop in nfnetlink. */
2345 return err == -EAGAIN ? -ENOBUFS : err;
2348 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2349 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2350 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2351 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2352 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2353 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2354 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2355 .len = NF_CT_HELPER_NAME_LEN - 1 },
2356 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2357 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2358 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2359 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2360 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2363 static struct nf_conntrack_expect *
2364 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2365 struct nf_conntrack_helper *helper,
2366 struct nf_conntrack_tuple *tuple,
2367 struct nf_conntrack_tuple *mask);
2369 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2371 ctnetlink_glue_build_size(const struct nf_conn *ct)
2373 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2374 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2375 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2376 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2377 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2378 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2379 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2380 + nla_total_size(0) /* CTA_PROTOINFO */
2381 + nla_total_size(0) /* CTA_HELP */
2382 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2383 + ctnetlink_secctx_size(ct)
2384 #if IS_ENABLED(CONFIG_NF_NAT)
2385 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2386 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2388 #ifdef CONFIG_NF_CONNTRACK_MARK
2389 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2391 #ifdef CONFIG_NF_CONNTRACK_ZONES
2392 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2394 + ctnetlink_proto_size(ct)
2398 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2399 enum ip_conntrack_info *ctinfo)
2401 return nf_ct_get(skb, ctinfo);
2404 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2406 const struct nf_conntrack_zone *zone;
2407 struct nlattr *nest_parms;
2409 zone = nf_ct_zone(ct);
2411 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2413 goto nla_put_failure;
2414 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2415 goto nla_put_failure;
2416 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2417 NF_CT_ZONE_DIR_ORIG) < 0)
2418 goto nla_put_failure;
2419 nla_nest_end(skb, nest_parms);
2421 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2423 goto nla_put_failure;
2424 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2425 goto nla_put_failure;
2426 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2427 NF_CT_ZONE_DIR_REPL) < 0)
2428 goto nla_put_failure;
2429 nla_nest_end(skb, nest_parms);
2431 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2432 NF_CT_DEFAULT_ZONE_DIR) < 0)
2433 goto nla_put_failure;
2435 if (ctnetlink_dump_id(skb, ct) < 0)
2436 goto nla_put_failure;
2438 if (ctnetlink_dump_status(skb, ct) < 0)
2439 goto nla_put_failure;
2441 if (ctnetlink_dump_timeout(skb, ct) < 0)
2442 goto nla_put_failure;
2444 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2445 goto nla_put_failure;
2447 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2448 goto nla_put_failure;
2450 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2451 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2452 goto nla_put_failure;
2454 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2455 goto nla_put_failure;
2457 if ((ct->status & IPS_SEQ_ADJUST) &&
2458 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2459 goto nla_put_failure;
2461 if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2462 goto nla_put_failure;
2464 #ifdef CONFIG_NF_CONNTRACK_MARK
2465 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2466 goto nla_put_failure;
2468 if (ctnetlink_dump_labels(skb, ct) < 0)
2469 goto nla_put_failure;
2477 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2478 enum ip_conntrack_info ctinfo,
2479 u_int16_t ct_attr, u_int16_t ct_info_attr)
2481 struct nlattr *nest_parms;
2483 nest_parms = nla_nest_start(skb, ct_attr);
2485 goto nla_put_failure;
2487 if (__ctnetlink_glue_build(skb, ct) < 0)
2488 goto nla_put_failure;
2490 nla_nest_end(skb, nest_parms);
2492 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2493 goto nla_put_failure;
2502 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2504 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2505 unsigned long d = ct->status ^ status;
2507 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2508 /* SEEN_REPLY bit can only be set */
2511 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2512 /* ASSURED bit can only be set */
2515 /* This check is less strict than ctnetlink_change_status()
2516 * because callers often flip IPS_EXPECTED bits when sending
2517 * an NFQA_CT attribute to the kernel. So ignore the
2518 * unchangeable bits but do not error out. Also user programs
2519 * are allowed to clear the bits that they are allowed to change.
2521 __ctnetlink_change_status(ct, status, ~status);
2526 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2530 if (cda[CTA_TIMEOUT]) {
2531 err = ctnetlink_change_timeout(ct, cda);
2535 if (cda[CTA_STATUS]) {
2536 err = ctnetlink_update_status(ct, cda);
2540 if (cda[CTA_HELP]) {
2541 err = ctnetlink_change_helper(ct, cda);
2545 if (cda[CTA_LABELS]) {
2546 err = ctnetlink_attach_labels(ct, cda);
2550 #if defined(CONFIG_NF_CONNTRACK_MARK)
2551 if (cda[CTA_MARK]) {
2552 ctnetlink_change_mark(ct, cda);
2559 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2561 struct nlattr *cda[CTA_MAX+1];
2564 ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2569 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2572 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2573 const struct nf_conn *ct,
2574 struct nf_conntrack_tuple *tuple,
2575 struct nf_conntrack_tuple *mask)
2579 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2580 nf_ct_l3num(ct), NULL);
2584 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2585 nf_ct_l3num(ct), NULL);
2589 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2590 u32 portid, u32 report)
2592 struct nlattr *cda[CTA_EXPECT_MAX+1];
2593 struct nf_conntrack_tuple tuple, mask;
2594 struct nf_conntrack_helper *helper = NULL;
2595 struct nf_conntrack_expect *exp;
2598 err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2599 exp_nla_policy, NULL);
2603 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2608 if (cda[CTA_EXPECT_HELP_NAME]) {
2609 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2611 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2612 nf_ct_protonum(ct));
2617 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2618 helper, &tuple, &mask);
2620 return PTR_ERR(exp);
2622 err = nf_ct_expect_related_report(exp, portid, report, 0);
2623 nf_ct_expect_put(exp);
2627 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2628 enum ip_conntrack_info ctinfo, int diff)
2630 if (!(ct->status & IPS_NAT_MASK))
2633 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2636 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2637 .get_ct = ctnetlink_glue_get_ct,
2638 .build_size = ctnetlink_glue_build_size,
2639 .build = ctnetlink_glue_build,
2640 .parse = ctnetlink_glue_parse,
2641 .attach_expect = ctnetlink_glue_attach_expect,
2642 .seq_adjust = ctnetlink_glue_seqadj,
2644 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2646 /***********************************************************************
2648 ***********************************************************************/
2650 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2651 const struct nf_conntrack_tuple *tuple,
2654 struct nlattr *nest_parms;
2656 nest_parms = nla_nest_start(skb, type);
2658 goto nla_put_failure;
2659 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2660 goto nla_put_failure;
2661 nla_nest_end(skb, nest_parms);
2669 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2670 const struct nf_conntrack_tuple *tuple,
2671 const struct nf_conntrack_tuple_mask *mask)
2673 const struct nf_conntrack_l4proto *l4proto;
2674 struct nf_conntrack_tuple m;
2675 struct nlattr *nest_parms;
2678 memset(&m, 0xFF, sizeof(m));
2679 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2680 m.src.u.all = mask->src.u.all;
2681 m.dst.protonum = tuple->dst.protonum;
2683 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2685 goto nla_put_failure;
2688 ret = ctnetlink_dump_tuples_ip(skb, &m);
2690 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2691 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2695 if (unlikely(ret < 0))
2696 goto nla_put_failure;
2698 nla_nest_end(skb, nest_parms);
2706 static const union nf_inet_addr any_addr;
2708 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2710 static __read_mostly siphash_key_t exp_id_seed;
2711 unsigned long a, b, c, d;
2713 net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
2715 a = (unsigned long)exp;
2716 b = (unsigned long)exp->helper;
2717 c = (unsigned long)exp->master;
2718 d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
2721 return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
2723 return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
2728 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2729 const struct nf_conntrack_expect *exp)
2731 struct nf_conn *master = exp->master;
2732 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2733 struct nf_conn_help *help;
2734 #if IS_ENABLED(CONFIG_NF_NAT)
2735 struct nlattr *nest_parms;
2736 struct nf_conntrack_tuple nat_tuple = {};
2738 struct nf_ct_helper_expectfn *expfn;
2743 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2744 goto nla_put_failure;
2745 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2746 goto nla_put_failure;
2747 if (ctnetlink_exp_dump_tuple(skb,
2748 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2749 CTA_EXPECT_MASTER) < 0)
2750 goto nla_put_failure;
2752 #if IS_ENABLED(CONFIG_NF_NAT)
2753 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2754 exp->saved_proto.all) {
2755 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
2757 goto nla_put_failure;
2759 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2760 goto nla_put_failure;
2762 nat_tuple.src.l3num = nf_ct_l3num(master);
2763 nat_tuple.src.u3 = exp->saved_addr;
2764 nat_tuple.dst.protonum = nf_ct_protonum(master);
2765 nat_tuple.src.u = exp->saved_proto;
2767 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2768 CTA_EXPECT_NAT_TUPLE) < 0)
2769 goto nla_put_failure;
2770 nla_nest_end(skb, nest_parms);
2773 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2774 nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
2775 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2776 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2777 goto nla_put_failure;
2778 help = nfct_help(master);
2780 struct nf_conntrack_helper *helper;
2782 helper = rcu_dereference(help->helper);
2784 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2785 goto nla_put_failure;
2787 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2788 if (expfn != NULL &&
2789 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2790 goto nla_put_failure;
2799 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2800 int event, const struct nf_conntrack_expect *exp)
2802 struct nlmsghdr *nlh;
2803 struct nfgenmsg *nfmsg;
2804 unsigned int flags = portid ? NLM_F_MULTI : 0;
2806 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
2807 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2811 nfmsg = nlmsg_data(nlh);
2812 nfmsg->nfgen_family = exp->tuple.src.l3num;
2813 nfmsg->version = NFNETLINK_V0;
2816 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2817 goto nla_put_failure;
2819 nlmsg_end(skb, nlh);
2824 nlmsg_cancel(skb, nlh);
2828 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2830 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2832 struct nf_conntrack_expect *exp = item->exp;
2833 struct net *net = nf_ct_exp_net(exp);
2834 struct nlmsghdr *nlh;
2835 struct nfgenmsg *nfmsg;
2836 struct sk_buff *skb;
2837 unsigned int type, group;
2840 if (events & (1 << IPEXP_DESTROY)) {
2841 type = IPCTNL_MSG_EXP_DELETE;
2842 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2843 } else if (events & (1 << IPEXP_NEW)) {
2844 type = IPCTNL_MSG_EXP_NEW;
2845 flags = NLM_F_CREATE|NLM_F_EXCL;
2846 group = NFNLGRP_CONNTRACK_EXP_NEW;
2850 if (!item->report && !nfnetlink_has_listeners(net, group))
2853 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2857 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
2858 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2862 nfmsg = nlmsg_data(nlh);
2863 nfmsg->nfgen_family = exp->tuple.src.l3num;
2864 nfmsg->version = NFNETLINK_V0;
2867 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2868 goto nla_put_failure;
2870 nlmsg_end(skb, nlh);
2871 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2875 nlmsg_cancel(skb, nlh);
2879 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2883 static int ctnetlink_exp_done(struct netlink_callback *cb)
2886 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2891 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2893 struct net *net = sock_net(skb->sk);
2894 struct nf_conntrack_expect *exp, *last;
2895 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2896 u_int8_t l3proto = nfmsg->nfgen_family;
2899 last = (struct nf_conntrack_expect *)cb->args[1];
2900 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2902 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
2904 if (l3proto && exp->tuple.src.l3num != l3proto)
2907 if (!net_eq(nf_ct_net(exp->master), net))
2915 if (ctnetlink_exp_fill_info(skb,
2916 NETLINK_CB(cb->skb).portid,
2920 if (!refcount_inc_not_zero(&exp->use))
2922 cb->args[1] = (unsigned long)exp;
2934 nf_ct_expect_put(last);
2940 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2942 struct nf_conntrack_expect *exp, *last;
2943 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2944 struct nf_conn *ct = cb->data;
2945 struct nf_conn_help *help = nfct_help(ct);
2946 u_int8_t l3proto = nfmsg->nfgen_family;
2952 last = (struct nf_conntrack_expect *)cb->args[1];
2954 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
2955 if (l3proto && exp->tuple.src.l3num != l3proto)
2962 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2966 if (!refcount_inc_not_zero(&exp->use))
2968 cb->args[1] = (unsigned long)exp;
2980 nf_ct_expect_put(last);
2985 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
2986 struct sk_buff *skb,
2987 const struct nlmsghdr *nlh,
2988 const struct nlattr * const cda[],
2989 struct netlink_ext_ack *extack)
2992 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2993 u_int8_t u3 = nfmsg->nfgen_family;
2994 struct nf_conntrack_tuple tuple;
2995 struct nf_conntrack_tuple_hash *h;
2997 struct nf_conntrack_zone zone;
2998 struct netlink_dump_control c = {
2999 .dump = ctnetlink_exp_ct_dump_table,
3000 .done = ctnetlink_exp_done,
3003 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3008 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3012 h = nf_conntrack_find_get(net, &zone, &tuple);
3016 ct = nf_ct_tuplehash_to_ctrack(h);
3017 /* No expectation linked to this connection tracking. */
3018 if (!nfct_help(ct)) {
3025 err = netlink_dump_start(ctnl, skb, nlh, &c);
3031 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
3032 struct sk_buff *skb, const struct nlmsghdr *nlh,
3033 const struct nlattr * const cda[],
3034 struct netlink_ext_ack *extack)
3036 struct nf_conntrack_tuple tuple;
3037 struct nf_conntrack_expect *exp;
3038 struct sk_buff *skb2;
3039 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3040 u_int8_t u3 = nfmsg->nfgen_family;
3041 struct nf_conntrack_zone zone;
3044 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3045 if (cda[CTA_EXPECT_MASTER])
3046 return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda,
3049 struct netlink_dump_control c = {
3050 .dump = ctnetlink_exp_dump_table,
3051 .done = ctnetlink_exp_done,
3053 return netlink_dump_start(ctnl, skb, nlh, &c);
3057 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3061 if (cda[CTA_EXPECT_TUPLE])
3062 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3064 else if (cda[CTA_EXPECT_MASTER])
3065 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3073 exp = nf_ct_expect_find_get(net, &zone, &tuple);
3077 if (cda[CTA_EXPECT_ID]) {
3078 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3080 if (id != nf_expect_get_id(exp)) {
3081 nf_ct_expect_put(exp);
3087 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3089 nf_ct_expect_put(exp);
3094 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3095 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
3097 nf_ct_expect_put(exp);
3101 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
3110 /* this avoids a loop in nfnetlink. */
3111 return err == -EAGAIN ? -ENOBUFS : err;
3114 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3116 const struct nf_conn_help *m_help;
3117 const char *name = data;
3119 m_help = nfct_help(exp->master);
3121 return strcmp(m_help->helper->name, name) == 0;
3124 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3129 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
3130 struct sk_buff *skb, const struct nlmsghdr *nlh,
3131 const struct nlattr * const cda[],
3132 struct netlink_ext_ack *extack)
3134 struct nf_conntrack_expect *exp;
3135 struct nf_conntrack_tuple tuple;
3136 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3137 u_int8_t u3 = nfmsg->nfgen_family;
3138 struct nf_conntrack_zone zone;
3141 if (cda[CTA_EXPECT_TUPLE]) {
3142 /* delete a single expect by tuple */
3143 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3147 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3152 /* bump usage count to 2 */
3153 exp = nf_ct_expect_find_get(net, &zone, &tuple);
3157 if (cda[CTA_EXPECT_ID]) {
3158 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3159 if (ntohl(id) != (u32)(unsigned long)exp) {
3160 nf_ct_expect_put(exp);
3165 /* after list removal, usage count == 1 */
3166 spin_lock_bh(&nf_conntrack_expect_lock);
3167 if (del_timer(&exp->timeout)) {
3168 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3170 nf_ct_expect_put(exp);
3172 spin_unlock_bh(&nf_conntrack_expect_lock);
3173 /* have to put what we 'get' above.
3174 * after this line usage count == 0 */
3175 nf_ct_expect_put(exp);
3176 } else if (cda[CTA_EXPECT_HELP_NAME]) {
3177 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3179 nf_ct_expect_iterate_net(net, expect_iter_name, name,
3180 NETLINK_CB(skb).portid,
3183 /* This basically means we have to flush everything*/
3184 nf_ct_expect_iterate_net(net, expect_iter_all, NULL,
3185 NETLINK_CB(skb).portid,
3192 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3193 const struct nlattr * const cda[])
3195 if (cda[CTA_EXPECT_TIMEOUT]) {
3196 if (!del_timer(&x->timeout))
3199 x->timeout.expires = jiffies +
3200 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3201 add_timer(&x->timeout);
3206 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3207 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3208 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3212 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3213 struct nf_conntrack_expect *exp,
3216 #if IS_ENABLED(CONFIG_NF_NAT)
3217 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3218 struct nf_conntrack_tuple nat_tuple = {};
3221 err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3222 exp_nat_nla_policy, NULL);
3226 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3229 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3230 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3235 exp->saved_addr = nat_tuple.src.u3;
3236 exp->saved_proto = nat_tuple.src.u;
3237 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3245 static struct nf_conntrack_expect *
3246 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3247 struct nf_conntrack_helper *helper,
3248 struct nf_conntrack_tuple *tuple,
3249 struct nf_conntrack_tuple *mask)
3251 u_int32_t class = 0;
3252 struct nf_conntrack_expect *exp;
3253 struct nf_conn_help *help;
3256 help = nfct_help(ct);
3258 return ERR_PTR(-EOPNOTSUPP);
3260 if (cda[CTA_EXPECT_CLASS] && helper) {
3261 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3262 if (class > helper->expect_class_max)
3263 return ERR_PTR(-EINVAL);
3265 exp = nf_ct_expect_alloc(ct);
3267 return ERR_PTR(-ENOMEM);
3269 if (cda[CTA_EXPECT_FLAGS]) {
3270 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3271 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3275 if (cda[CTA_EXPECT_FN]) {
3276 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3277 struct nf_ct_helper_expectfn *expfn;
3279 expfn = nf_ct_helper_expectfn_find_by_name(name);
3280 if (expfn == NULL) {
3284 exp->expectfn = expfn->expectfn;
3286 exp->expectfn = NULL;
3290 exp->helper = helper;
3291 exp->tuple = *tuple;
3292 exp->mask.src.u3 = mask->src.u3;
3293 exp->mask.src.u.all = mask->src.u.all;
3295 if (cda[CTA_EXPECT_NAT]) {
3296 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3297 exp, nf_ct_l3num(ct));
3303 nf_ct_expect_put(exp);
3304 return ERR_PTR(err);
3308 ctnetlink_create_expect(struct net *net,
3309 const struct nf_conntrack_zone *zone,
3310 const struct nlattr * const cda[],
3311 u_int8_t u3, u32 portid, int report)
3313 struct nf_conntrack_tuple tuple, mask, master_tuple;
3314 struct nf_conntrack_tuple_hash *h = NULL;
3315 struct nf_conntrack_helper *helper = NULL;
3316 struct nf_conntrack_expect *exp;
3320 /* caller guarantees that those three CTA_EXPECT_* exist */
3321 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3325 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3329 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3334 /* Look for master conntrack of this expectation */
3335 h = nf_conntrack_find_get(net, zone, &master_tuple);
3338 ct = nf_ct_tuplehash_to_ctrack(h);
3341 if (cda[CTA_EXPECT_HELP_NAME]) {
3342 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3344 helper = __nf_conntrack_helper_find(helpname, u3,
3345 nf_ct_protonum(ct));
3346 if (helper == NULL) {
3348 #ifdef CONFIG_MODULES
3349 if (request_module("nfct-helper-%s", helpname) < 0) {
3354 helper = __nf_conntrack_helper_find(helpname, u3,
3355 nf_ct_protonum(ct));
3367 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3373 err = nf_ct_expect_related_report(exp, portid, report, 0);
3374 nf_ct_expect_put(exp);
3382 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3383 struct sk_buff *skb, const struct nlmsghdr *nlh,
3384 const struct nlattr * const cda[],
3385 struct netlink_ext_ack *extack)
3387 struct nf_conntrack_tuple tuple;
3388 struct nf_conntrack_expect *exp;
3389 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3390 u_int8_t u3 = nfmsg->nfgen_family;
3391 struct nf_conntrack_zone zone;
3394 if (!cda[CTA_EXPECT_TUPLE]
3395 || !cda[CTA_EXPECT_MASK]
3396 || !cda[CTA_EXPECT_MASTER])
3399 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3403 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3408 spin_lock_bh(&nf_conntrack_expect_lock);
3409 exp = __nf_ct_expect_find(net, &zone, &tuple);
3411 spin_unlock_bh(&nf_conntrack_expect_lock);
3413 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3414 err = ctnetlink_create_expect(net, &zone, cda, u3,
3415 NETLINK_CB(skb).portid,
3422 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3423 err = ctnetlink_change_expect(exp, cda);
3424 spin_unlock_bh(&nf_conntrack_expect_lock);
3430 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3431 const struct ip_conntrack_stat *st)
3433 struct nlmsghdr *nlh;
3434 struct nfgenmsg *nfmsg;
3435 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3437 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3438 IPCTNL_MSG_EXP_GET_STATS_CPU);
3439 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3443 nfmsg = nlmsg_data(nlh);
3444 nfmsg->nfgen_family = AF_UNSPEC;
3445 nfmsg->version = NFNETLINK_V0;
3446 nfmsg->res_id = htons(cpu);
3448 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3449 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3450 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3451 goto nla_put_failure;
3453 nlmsg_end(skb, nlh);
3458 nlmsg_cancel(skb, nlh);
3463 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3466 struct net *net = sock_net(skb->sk);
3468 if (cb->args[0] == nr_cpu_ids)
3471 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3472 const struct ip_conntrack_stat *st;
3474 if (!cpu_possible(cpu))
3477 st = per_cpu_ptr(net->ct.stat, cpu);
3478 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3488 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3489 struct sk_buff *skb,
3490 const struct nlmsghdr *nlh,
3491 const struct nlattr * const cda[],
3492 struct netlink_ext_ack *extack)
3494 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3495 struct netlink_dump_control c = {
3496 .dump = ctnetlink_exp_stat_cpu_dump,
3498 return netlink_dump_start(ctnl, skb, nlh, &c);
3504 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3505 static struct nf_ct_event_notifier ctnl_notifier = {
3506 .fcn = ctnetlink_conntrack_event,
3509 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3510 .fcn = ctnetlink_expect_event,
3514 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3515 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3516 .attr_count = CTA_MAX,
3517 .policy = ct_nla_policy },
3518 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3519 .attr_count = CTA_MAX,
3520 .policy = ct_nla_policy },
3521 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3522 .attr_count = CTA_MAX,
3523 .policy = ct_nla_policy },
3524 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3525 .attr_count = CTA_MAX,
3526 .policy = ct_nla_policy },
3527 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3528 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3529 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3530 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3533 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3534 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3535 .attr_count = CTA_EXPECT_MAX,
3536 .policy = exp_nla_policy },
3537 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3538 .attr_count = CTA_EXPECT_MAX,
3539 .policy = exp_nla_policy },
3540 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3541 .attr_count = CTA_EXPECT_MAX,
3542 .policy = exp_nla_policy },
3543 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3546 static const struct nfnetlink_subsystem ctnl_subsys = {
3547 .name = "conntrack",
3548 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3549 .cb_count = IPCTNL_MSG_MAX,
3553 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3554 .name = "conntrack_expect",
3555 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3556 .cb_count = IPCTNL_MSG_EXP_MAX,
3560 MODULE_ALIAS("ip_conntrack_netlink");
3561 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3562 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3564 static int __net_init ctnetlink_net_init(struct net *net)
3566 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3569 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3571 pr_err("ctnetlink_init: cannot register notifier.\n");
3575 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3577 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3578 goto err_unreg_notifier;
3583 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3585 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3591 static void ctnetlink_net_exit(struct net *net)
3593 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3594 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3595 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3599 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3603 list_for_each_entry(net, net_exit_list, exit_list)
3604 ctnetlink_net_exit(net);
3607 static struct pernet_operations ctnetlink_net_ops = {
3608 .init = ctnetlink_net_init,
3609 .exit_batch = ctnetlink_net_exit_batch,
3612 static int __init ctnetlink_init(void)
3616 ret = nfnetlink_subsys_register(&ctnl_subsys);
3618 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3622 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3624 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3625 goto err_unreg_subsys;
3628 ret = register_pernet_subsys(&ctnetlink_net_ops);
3630 pr_err("ctnetlink_init: cannot register pernet operations\n");
3631 goto err_unreg_exp_subsys;
3633 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3634 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3635 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3639 err_unreg_exp_subsys:
3640 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3642 nfnetlink_subsys_unregister(&ctnl_subsys);
3647 static void __exit ctnetlink_exit(void)
3649 unregister_pernet_subsys(&ctnetlink_net_ops);
3650 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3651 nfnetlink_subsys_unregister(&ctnl_subsys);
3652 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3653 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3658 module_init(ctnetlink_init);
3659 module_exit(ctnetlink_exit);