1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/security.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
32 #include <linux/siphash.h>
34 #include <linux/netfilter.h>
35 #include <net/netlink.h>
37 #include <net/netfilter/nf_conntrack.h>
38 #include <net/netfilter/nf_conntrack_core.h>
39 #include <net/netfilter/nf_conntrack_expect.h>
40 #include <net/netfilter/nf_conntrack_helper.h>
41 #include <net/netfilter/nf_conntrack_seqadj.h>
42 #include <net/netfilter/nf_conntrack_l4proto.h>
43 #include <net/netfilter/nf_conntrack_tuple.h>
44 #include <net/netfilter/nf_conntrack_acct.h>
45 #include <net/netfilter/nf_conntrack_zones.h>
46 #include <net/netfilter/nf_conntrack_timestamp.h>
47 #include <net/netfilter/nf_conntrack_labels.h>
48 #include <net/netfilter/nf_conntrack_synproxy.h>
49 #if IS_ENABLED(CONFIG_NF_NAT)
50 #include <net/netfilter/nf_nat.h>
51 #include <net/netfilter/nf_nat_helper.h>
54 #include <linux/netfilter/nfnetlink.h>
55 #include <linux/netfilter/nfnetlink_conntrack.h>
57 #include "nf_internals.h"
59 MODULE_LICENSE("GPL");
61 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
62 const struct nf_conntrack_tuple *tuple,
63 const struct nf_conntrack_l4proto *l4proto)
66 struct nlattr *nest_parms;
68 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO);
71 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
74 if (likely(l4proto->tuple_to_nlattr))
75 ret = l4proto->tuple_to_nlattr(skb, tuple);
77 nla_nest_end(skb, nest_parms);
85 static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
86 const struct nf_conntrack_tuple *tuple)
88 if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
89 nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
94 static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
95 const struct nf_conntrack_tuple *tuple)
97 if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
98 nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
103 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
104 const struct nf_conntrack_tuple *tuple)
107 struct nlattr *nest_parms;
109 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP);
111 goto nla_put_failure;
113 switch (tuple->src.l3num) {
115 ret = ipv4_tuple_to_nlattr(skb, tuple);
118 ret = ipv6_tuple_to_nlattr(skb, tuple);
122 nla_nest_end(skb, nest_parms);
130 static int ctnetlink_dump_tuples(struct sk_buff *skb,
131 const struct nf_conntrack_tuple *tuple)
133 const struct nf_conntrack_l4proto *l4proto;
137 ret = ctnetlink_dump_tuples_ip(skb, tuple);
140 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
141 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
147 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
148 const struct nf_conntrack_zone *zone, int dir)
150 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
152 if (nla_put_be16(skb, attrtype, htons(zone->id)))
153 goto nla_put_failure;
160 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
162 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
163 goto nla_put_failure;
170 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct,
173 long timeout = nf_ct_expires(ct) / HZ;
175 if (skip_zero && timeout == 0)
178 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
179 goto nla_put_failure;
186 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct,
189 const struct nf_conntrack_l4proto *l4proto;
190 struct nlattr *nest_proto;
193 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
194 if (!l4proto->to_nlattr)
197 nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
199 goto nla_put_failure;
201 ret = l4proto->to_nlattr(skb, nest_proto, ct, destroy);
203 nla_nest_end(skb, nest_proto);
211 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
212 const struct nf_conn *ct)
214 struct nlattr *nest_helper;
215 const struct nf_conn_help *help = nfct_help(ct);
216 struct nf_conntrack_helper *helper;
221 helper = rcu_dereference(help->helper);
225 nest_helper = nla_nest_start(skb, CTA_HELP);
227 goto nla_put_failure;
228 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
229 goto nla_put_failure;
231 if (helper->to_nlattr)
232 helper->to_nlattr(skb, ct);
234 nla_nest_end(skb, nest_helper);
243 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
244 enum ip_conntrack_dir dir, int type)
246 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
247 struct nf_conn_counter *counter = acct->counter;
248 struct nlattr *nest_count;
251 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
252 pkts = atomic64_xchg(&counter[dir].packets, 0);
253 bytes = atomic64_xchg(&counter[dir].bytes, 0);
255 pkts = atomic64_read(&counter[dir].packets);
256 bytes = atomic64_read(&counter[dir].bytes);
259 nest_count = nla_nest_start(skb, attr);
261 goto nla_put_failure;
263 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
265 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
267 goto nla_put_failure;
269 nla_nest_end(skb, nest_count);
278 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
280 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
285 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
287 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
294 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
296 struct nlattr *nest_count;
297 const struct nf_conn_tstamp *tstamp;
299 tstamp = nf_conn_tstamp_find(ct);
303 nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
305 goto nla_put_failure;
307 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
308 CTA_TIMESTAMP_PAD) ||
309 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
310 cpu_to_be64(tstamp->stop),
312 goto nla_put_failure;
313 nla_nest_end(skb, nest_count);
321 #ifdef CONFIG_NF_CONNTRACK_MARK
322 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
324 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
325 goto nla_put_failure;
332 #define ctnetlink_dump_mark(a, b) (0)
335 #ifdef CONFIG_NF_CONNTRACK_SECMARK
336 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
338 struct nlattr *nest_secctx;
342 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
347 nest_secctx = nla_nest_start(skb, CTA_SECCTX);
349 goto nla_put_failure;
351 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
352 goto nla_put_failure;
353 nla_nest_end(skb, nest_secctx);
357 security_release_secctx(secctx, len);
361 #define ctnetlink_dump_secctx(a, b) (0)
364 #ifdef CONFIG_NF_CONNTRACK_LABELS
365 static inline int ctnetlink_label_size(const struct nf_conn *ct)
367 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
371 return nla_total_size(sizeof(labels->bits));
375 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
377 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
385 if (labels->bits[i] != 0)
386 return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
389 } while (i < ARRAY_SIZE(labels->bits));
394 #define ctnetlink_dump_labels(a, b) (0)
395 #define ctnetlink_label_size(a) (0)
398 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
400 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
402 struct nlattr *nest_parms;
404 if (!(ct->status & IPS_EXPECTED))
407 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
409 goto nla_put_failure;
410 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
411 goto nla_put_failure;
412 nla_nest_end(skb, nest_parms);
421 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
423 struct nlattr *nest_parms;
425 nest_parms = nla_nest_start(skb, type);
427 goto nla_put_failure;
429 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
430 htonl(seq->correction_pos)) ||
431 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
432 htonl(seq->offset_before)) ||
433 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
434 htonl(seq->offset_after)))
435 goto nla_put_failure;
437 nla_nest_end(skb, nest_parms);
445 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
447 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
448 struct nf_ct_seqadj *seq;
450 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
453 spin_lock_bh(&ct->lock);
454 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
455 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
458 seq = &seqadj->seq[IP_CT_DIR_REPLY];
459 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
462 spin_unlock_bh(&ct->lock);
465 spin_unlock_bh(&ct->lock);
469 static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
471 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
472 struct nlattr *nest_parms;
477 nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
479 goto nla_put_failure;
481 if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
482 nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
483 nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
484 goto nla_put_failure;
486 nla_nest_end(skb, nest_parms);
494 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
496 __be32 id = (__force __be32)nf_ct_get_id(ct);
498 if (nla_put_be32(skb, CTA_ID, id))
499 goto nla_put_failure;
506 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
508 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
509 goto nla_put_failure;
516 /* all these functions access ct->ext. Caller must either hold a reference
517 * on ct or prevent its deletion by holding either the bucket spinlock or
518 * pcpu dying list lock.
520 static int ctnetlink_dump_extinfo(struct sk_buff *skb,
521 struct nf_conn *ct, u32 type)
523 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
524 ctnetlink_dump_timestamp(skb, ct) < 0 ||
525 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
526 ctnetlink_dump_labels(skb, ct) < 0 ||
527 ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
528 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
534 static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
536 if (ctnetlink_dump_status(skb, ct) < 0 ||
537 ctnetlink_dump_mark(skb, ct) < 0 ||
538 ctnetlink_dump_secctx(skb, ct) < 0 ||
539 ctnetlink_dump_id(skb, ct) < 0 ||
540 ctnetlink_dump_use(skb, ct) < 0 ||
541 ctnetlink_dump_master(skb, ct) < 0)
544 if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
545 (ctnetlink_dump_timeout(skb, ct, false) < 0 ||
546 ctnetlink_dump_protoinfo(skb, ct, false) < 0))
553 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
554 struct nf_conn *ct, bool extinfo, unsigned int flags)
556 const struct nf_conntrack_zone *zone;
557 struct nlmsghdr *nlh;
558 struct nfgenmsg *nfmsg;
559 struct nlattr *nest_parms;
563 flags |= NLM_F_MULTI;
564 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
565 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
569 nfmsg = nlmsg_data(nlh);
570 nfmsg->nfgen_family = nf_ct_l3num(ct);
571 nfmsg->version = NFNETLINK_V0;
574 zone = nf_ct_zone(ct);
576 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
578 goto nla_put_failure;
579 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
580 goto nla_put_failure;
581 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
582 NF_CT_ZONE_DIR_ORIG) < 0)
583 goto nla_put_failure;
584 nla_nest_end(skb, nest_parms);
586 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
588 goto nla_put_failure;
589 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
590 goto nla_put_failure;
591 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
592 NF_CT_ZONE_DIR_REPL) < 0)
593 goto nla_put_failure;
594 nla_nest_end(skb, nest_parms);
596 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
597 NF_CT_DEFAULT_ZONE_DIR) < 0)
598 goto nla_put_failure;
600 if (ctnetlink_dump_info(skb, ct) < 0)
601 goto nla_put_failure;
602 if (extinfo && ctnetlink_dump_extinfo(skb, ct, type) < 0)
603 goto nla_put_failure;
610 nlmsg_cancel(skb, nlh);
614 static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
615 [CTA_IP_V4_SRC] = { .type = NLA_U32 },
616 [CTA_IP_V4_DST] = { .type = NLA_U32 },
617 [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
618 [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
621 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
622 static size_t ctnetlink_proto_size(const struct nf_conn *ct)
624 const struct nf_conntrack_l4proto *l4proto;
625 size_t len, len4 = 0;
627 len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
628 len *= 3u; /* ORIG, REPLY, MASTER */
630 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
631 len += l4proto->nlattr_size;
632 if (l4proto->nlattr_tuple_size) {
633 len4 = l4proto->nlattr_tuple_size();
634 len4 *= 3u; /* ORIG, REPLY, MASTER */
641 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
643 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
645 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
646 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
647 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
651 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
653 #ifdef CONFIG_NF_CONNTRACK_SECMARK
656 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
660 return nla_total_size(0) /* CTA_SECCTX */
661 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
667 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
669 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
670 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
672 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
678 #ifdef CONFIG_NF_CONNTRACK_EVENTS
679 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
681 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
682 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
683 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
684 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
685 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
686 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
687 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
688 + ctnetlink_acct_size(ct)
689 + ctnetlink_timestamp_size(ct)
690 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
691 + nla_total_size(0) /* CTA_PROTOINFO */
692 + nla_total_size(0) /* CTA_HELP */
693 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
694 + ctnetlink_secctx_size(ct)
695 #if IS_ENABLED(CONFIG_NF_NAT)
696 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
697 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
699 #ifdef CONFIG_NF_CONNTRACK_MARK
700 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
702 #ifdef CONFIG_NF_CONNTRACK_ZONES
703 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
705 + ctnetlink_proto_size(ct)
706 + ctnetlink_label_size(ct)
711 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
713 const struct nf_conntrack_zone *zone;
715 struct nlmsghdr *nlh;
716 struct nfgenmsg *nfmsg;
717 struct nlattr *nest_parms;
718 struct nf_conn *ct = item->ct;
721 unsigned int flags = 0, group;
724 if (events & (1 << IPCT_DESTROY)) {
725 type = IPCTNL_MSG_CT_DELETE;
726 group = NFNLGRP_CONNTRACK_DESTROY;
727 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
728 type = IPCTNL_MSG_CT_NEW;
729 flags = NLM_F_CREATE|NLM_F_EXCL;
730 group = NFNLGRP_CONNTRACK_NEW;
732 type = IPCTNL_MSG_CT_NEW;
733 group = NFNLGRP_CONNTRACK_UPDATE;
738 if (!item->report && !nfnetlink_has_listeners(net, group))
741 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
745 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
746 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
750 nfmsg = nlmsg_data(nlh);
751 nfmsg->nfgen_family = nf_ct_l3num(ct);
752 nfmsg->version = NFNETLINK_V0;
755 zone = nf_ct_zone(ct);
757 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
759 goto nla_put_failure;
760 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
761 goto nla_put_failure;
762 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
763 NF_CT_ZONE_DIR_ORIG) < 0)
764 goto nla_put_failure;
765 nla_nest_end(skb, nest_parms);
767 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
769 goto nla_put_failure;
770 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
771 goto nla_put_failure;
772 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
773 NF_CT_ZONE_DIR_REPL) < 0)
774 goto nla_put_failure;
775 nla_nest_end(skb, nest_parms);
777 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
778 NF_CT_DEFAULT_ZONE_DIR) < 0)
779 goto nla_put_failure;
781 if (ctnetlink_dump_id(skb, ct) < 0)
782 goto nla_put_failure;
784 if (ctnetlink_dump_status(skb, ct) < 0)
785 goto nla_put_failure;
787 if (events & (1 << IPCT_DESTROY)) {
788 if (ctnetlink_dump_timeout(skb, ct, true) < 0)
789 goto nla_put_failure;
791 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
792 ctnetlink_dump_timestamp(skb, ct) < 0 ||
793 ctnetlink_dump_protoinfo(skb, ct, true) < 0)
794 goto nla_put_failure;
796 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
797 goto nla_put_failure;
799 if (events & (1 << IPCT_PROTOINFO) &&
800 ctnetlink_dump_protoinfo(skb, ct, false) < 0)
801 goto nla_put_failure;
803 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
804 && ctnetlink_dump_helpinfo(skb, ct) < 0)
805 goto nla_put_failure;
807 #ifdef CONFIG_NF_CONNTRACK_SECMARK
808 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
809 && ctnetlink_dump_secctx(skb, ct) < 0)
810 goto nla_put_failure;
812 if (events & (1 << IPCT_LABEL) &&
813 ctnetlink_dump_labels(skb, ct) < 0)
814 goto nla_put_failure;
816 if (events & (1 << IPCT_RELATED) &&
817 ctnetlink_dump_master(skb, ct) < 0)
818 goto nla_put_failure;
820 if (events & (1 << IPCT_SEQADJ) &&
821 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
822 goto nla_put_failure;
824 if (events & (1 << IPCT_SYNPROXY) &&
825 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
826 goto nla_put_failure;
829 #ifdef CONFIG_NF_CONNTRACK_MARK
830 if ((events & (1 << IPCT_MARK) || ct->mark)
831 && ctnetlink_dump_mark(skb, ct) < 0)
832 goto nla_put_failure;
835 err = nfnetlink_send(skb, net, item->portid, group, item->report,
837 if (err == -ENOBUFS || err == -EAGAIN)
843 nlmsg_cancel(skb, nlh);
847 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
852 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
854 static int ctnetlink_done(struct netlink_callback *cb)
857 nf_ct_put((struct nf_conn *)cb->args[1]);
862 struct ctnetlink_filter {
865 u_int32_t orig_flags;
866 u_int32_t reply_flags;
868 struct nf_conntrack_tuple orig;
869 struct nf_conntrack_tuple reply;
870 struct nf_conntrack_zone zone;
878 static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
879 [CTA_FILTER_ORIG_FLAGS] = { .type = NLA_U32 },
880 [CTA_FILTER_REPLY_FLAGS] = { .type = NLA_U32 },
883 static int ctnetlink_parse_filter(const struct nlattr *attr,
884 struct ctnetlink_filter *filter)
886 struct nlattr *tb[CTA_FILTER_MAX + 1];
889 ret = nla_parse_nested(tb, CTA_FILTER_MAX, attr, cta_filter_nla_policy,
894 if (tb[CTA_FILTER_ORIG_FLAGS]) {
895 filter->orig_flags = nla_get_u32(tb[CTA_FILTER_ORIG_FLAGS]);
896 if (filter->orig_flags & ~CTA_FILTER_F_ALL)
900 if (tb[CTA_FILTER_REPLY_FLAGS]) {
901 filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
902 if (filter->reply_flags & ~CTA_FILTER_F_ALL)
909 static int ctnetlink_parse_zone(const struct nlattr *attr,
910 struct nf_conntrack_zone *zone);
911 static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
912 struct nf_conntrack_tuple *tuple,
913 u32 type, u_int8_t l3num,
914 struct nf_conntrack_zone *zone,
917 static struct ctnetlink_filter *
918 ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
920 struct ctnetlink_filter *filter;
923 #ifndef CONFIG_NF_CONNTRACK_MARK
924 if (cda[CTA_MARK] || cda[CTA_MARK_MASK])
925 return ERR_PTR(-EOPNOTSUPP);
928 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
930 return ERR_PTR(-ENOMEM);
932 filter->family = family;
934 #ifdef CONFIG_NF_CONNTRACK_MARK
936 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
937 if (cda[CTA_MARK_MASK])
938 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
940 filter->mark.mask = 0xffffffff;
941 } else if (cda[CTA_MARK_MASK]) {
946 if (!cda[CTA_FILTER])
949 err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
953 err = ctnetlink_parse_filter(cda[CTA_FILTER], filter);
957 if (filter->orig_flags) {
958 if (!cda[CTA_TUPLE_ORIG]) {
963 err = ctnetlink_parse_tuple_filter(cda, &filter->orig,
972 if (filter->reply_flags) {
973 if (!cda[CTA_TUPLE_REPLY]) {
978 err = ctnetlink_parse_tuple_filter(cda, &filter->reply,
997 static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
999 return family || cda[CTA_MARK] || cda[CTA_FILTER];
1002 static int ctnetlink_start(struct netlink_callback *cb)
1004 const struct nlattr * const *cda = cb->data;
1005 struct ctnetlink_filter *filter = NULL;
1006 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1007 u8 family = nfmsg->nfgen_family;
1009 if (ctnetlink_needs_filter(family, cda)) {
1010 filter = ctnetlink_alloc_filter(cda, family);
1012 return PTR_ERR(filter);
1019 static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
1020 struct nf_conntrack_tuple *ct_tuple,
1021 u_int32_t flags, int family)
1025 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1026 filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
1029 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1030 filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
1034 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1035 !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
1036 &ct_tuple->src.u3.in6))
1039 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1040 !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
1041 &ct_tuple->dst.u3.in6))
1046 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
1047 filter_tuple->dst.protonum != ct_tuple->dst.protonum)
1050 switch (ct_tuple->dst.protonum) {
1053 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
1054 filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
1057 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
1058 filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
1062 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
1063 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1065 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
1066 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1068 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
1069 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1072 case IPPROTO_ICMPV6:
1073 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
1074 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1076 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
1077 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1079 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
1080 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1088 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
1090 struct ctnetlink_filter *filter = data;
1091 struct nf_conntrack_tuple *tuple;
1096 /* Match entries of a given L3 protocol number.
1097 * If it is not specified, ie. l3proto == 0,
1098 * then match everything.
1100 if (filter->family && nf_ct_l3num(ct) != filter->family)
1103 if (filter->orig_flags) {
1104 tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
1105 if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
1111 if (filter->reply_flags) {
1112 tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
1113 if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
1114 filter->reply_flags,
1119 #ifdef CONFIG_NF_CONNTRACK_MARK
1120 if ((ct->mark & filter->mark.mask) != filter->mark.val)
1132 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1134 unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
1135 struct net *net = sock_net(skb->sk);
1136 struct nf_conn *ct, *last;
1137 struct nf_conntrack_tuple_hash *h;
1138 struct hlist_nulls_node *n;
1139 struct nf_conn *nf_ct_evict[8];
1143 last = (struct nf_conn *)cb->args[1];
1147 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
1151 if (nf_ct_should_gc(nf_ct_evict[i]))
1152 nf_ct_kill(nf_ct_evict[i]);
1153 nf_ct_put(nf_ct_evict[i]);
1156 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
1157 nf_conntrack_lock(lockp);
1158 if (cb->args[0] >= nf_conntrack_htable_size) {
1162 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
1164 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
1166 ct = nf_ct_tuplehash_to_ctrack(h);
1167 if (nf_ct_is_expired(ct)) {
1168 if (i < ARRAY_SIZE(nf_ct_evict) &&
1169 atomic_inc_not_zero(&ct->ct_general.use))
1170 nf_ct_evict[i++] = ct;
1174 if (!net_eq(net, nf_ct_net(ct)))
1182 if (!ctnetlink_filter_match(ct, cb->data))
1186 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1188 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1191 nf_conntrack_get(&ct->ct_general);
1192 cb->args[1] = (unsigned long)ct;
1206 /* nf ct hash resize happened, now clear the leftover. */
1207 if ((struct nf_conn *)cb->args[1] == last)
1215 if (nf_ct_should_gc(nf_ct_evict[i]))
1216 nf_ct_kill(nf_ct_evict[i]);
1217 nf_ct_put(nf_ct_evict[i]);
1223 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
1224 struct nf_conntrack_tuple *t,
1227 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1228 if (!tb[CTA_IP_V4_SRC])
1231 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1234 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1235 if (!tb[CTA_IP_V4_DST])
1238 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1244 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1245 struct nf_conntrack_tuple *t,
1248 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1249 if (!tb[CTA_IP_V6_SRC])
1252 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1255 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1256 if (!tb[CTA_IP_V6_DST])
1259 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1265 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1266 struct nf_conntrack_tuple *tuple,
1269 struct nlattr *tb[CTA_IP_MAX+1];
1272 ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
1276 ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
1277 cta_ip_nla_policy, NULL);
1281 switch (tuple->src.l3num) {
1283 ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
1286 ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
1293 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1294 [CTA_PROTO_NUM] = { .type = NLA_U8 },
1297 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1298 struct nf_conntrack_tuple *tuple,
1301 const struct nf_conntrack_l4proto *l4proto;
1302 struct nlattr *tb[CTA_PROTO_MAX+1];
1305 ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1306 proto_nla_policy, NULL);
1310 if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
1313 if (!tb[CTA_PROTO_NUM])
1316 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1319 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1321 if (likely(l4proto->nlattr_to_tuple)) {
1322 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1323 l4proto->nla_policy,
1326 ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
1335 ctnetlink_parse_zone(const struct nlattr *attr,
1336 struct nf_conntrack_zone *zone)
1338 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1339 NF_CT_DEFAULT_ZONE_DIR, 0);
1340 #ifdef CONFIG_NF_CONNTRACK_ZONES
1342 zone->id = ntohs(nla_get_be16(attr));
1351 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1352 struct nf_conntrack_zone *zone)
1356 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1359 ret = ctnetlink_parse_zone(attr, zone);
1363 if (type == CTA_TUPLE_REPLY)
1364 zone->dir = NF_CT_ZONE_DIR_REPL;
1366 zone->dir = NF_CT_ZONE_DIR_ORIG;
1371 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1372 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1373 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1374 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1377 #define CTA_FILTER_F_ALL_CTA_PROTO \
1378 (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
1379 CTA_FILTER_F_CTA_PROTO_DST_PORT | \
1380 CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
1381 CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
1382 CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
1383 CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
1384 CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
1385 CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
1388 ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
1389 struct nf_conntrack_tuple *tuple, u32 type,
1390 u_int8_t l3num, struct nf_conntrack_zone *zone,
1393 struct nlattr *tb[CTA_TUPLE_MAX+1];
1396 memset(tuple, 0, sizeof(*tuple));
1398 err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1399 tuple_nla_policy, NULL);
1403 if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1405 tuple->src.l3num = l3num;
1407 if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
1408 flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1409 if (!tb[CTA_TUPLE_IP])
1412 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
1417 if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
1418 if (!tb[CTA_TUPLE_PROTO])
1421 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
1424 } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
1425 /* Can't manage proto flags without a protonum */
1429 if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
1433 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1439 /* orig and expect tuples get DIR_ORIGINAL */
1440 if (type == CTA_TUPLE_REPLY)
1441 tuple->dst.dir = IP_CT_DIR_REPLY;
1443 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1449 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1450 struct nf_conntrack_tuple *tuple, u32 type,
1451 u_int8_t l3num, struct nf_conntrack_zone *zone)
1453 return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
1454 CTA_FILTER_FLAG(ALL));
1457 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1458 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1459 .len = NF_CT_HELPER_NAME_LEN - 1 },
1462 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1463 struct nlattr **helpinfo)
1466 struct nlattr *tb[CTA_HELP_MAX+1];
1468 err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1469 help_nla_policy, NULL);
1473 if (!tb[CTA_HELP_NAME])
1476 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1478 if (tb[CTA_HELP_INFO])
1479 *helpinfo = tb[CTA_HELP_INFO];
1484 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1485 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1486 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1487 [CTA_STATUS] = { .type = NLA_U32 },
1488 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1489 [CTA_HELP] = { .type = NLA_NESTED },
1490 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1491 [CTA_TIMEOUT] = { .type = NLA_U32 },
1492 [CTA_MARK] = { .type = NLA_U32 },
1493 [CTA_ID] = { .type = NLA_U32 },
1494 [CTA_NAT_DST] = { .type = NLA_NESTED },
1495 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1496 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1497 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1498 [CTA_ZONE] = { .type = NLA_U16 },
1499 [CTA_MARK_MASK] = { .type = NLA_U32 },
1500 [CTA_LABELS] = { .type = NLA_BINARY,
1501 .len = NF_CT_LABELS_MAX_SIZE },
1502 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1503 .len = NF_CT_LABELS_MAX_SIZE },
1504 [CTA_FILTER] = { .type = NLA_NESTED },
1507 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1509 if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1512 return ctnetlink_filter_match(ct, data);
1515 static int ctnetlink_flush_conntrack(struct net *net,
1516 const struct nlattr * const cda[],
1517 u32 portid, int report, u8 family)
1519 struct ctnetlink_filter *filter = NULL;
1521 if (ctnetlink_needs_filter(family, cda)) {
1522 if (cda[CTA_FILTER])
1525 filter = ctnetlink_alloc_filter(cda, family);
1527 return PTR_ERR(filter);
1530 nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
1537 static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1538 struct sk_buff *skb,
1539 const struct nlmsghdr *nlh,
1540 const struct nlattr * const cda[],
1541 struct netlink_ext_ack *extack)
1543 struct nf_conntrack_tuple_hash *h;
1544 struct nf_conntrack_tuple tuple;
1546 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1547 struct nf_conntrack_zone zone;
1550 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1554 if (cda[CTA_TUPLE_ORIG])
1555 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1556 nfmsg->nfgen_family, &zone);
1557 else if (cda[CTA_TUPLE_REPLY])
1558 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1559 nfmsg->nfgen_family, &zone);
1561 u_int8_t u3 = nfmsg->version ? nfmsg->nfgen_family : AF_UNSPEC;
1563 return ctnetlink_flush_conntrack(net, cda,
1564 NETLINK_CB(skb).portid,
1565 nlmsg_report(nlh), u3);
1571 h = nf_conntrack_find_get(net, &zone, &tuple);
1575 ct = nf_ct_tuplehash_to_ctrack(h);
1577 if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1583 __be32 id = nla_get_be32(cda[CTA_ID]);
1585 if (id != (__force __be32)nf_ct_get_id(ct)) {
1591 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1597 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1598 struct sk_buff *skb,
1599 const struct nlmsghdr *nlh,
1600 const struct nlattr * const cda[],
1601 struct netlink_ext_ack *extack)
1603 struct nf_conntrack_tuple_hash *h;
1604 struct nf_conntrack_tuple tuple;
1606 struct sk_buff *skb2 = NULL;
1607 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1608 u_int8_t u3 = nfmsg->nfgen_family;
1609 struct nf_conntrack_zone zone;
1612 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1613 struct netlink_dump_control c = {
1614 .start = ctnetlink_start,
1615 .dump = ctnetlink_dump_table,
1616 .done = ctnetlink_done,
1617 .data = (void *)cda,
1620 return netlink_dump_start(ctnl, skb, nlh, &c);
1623 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1627 if (cda[CTA_TUPLE_ORIG])
1628 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1630 else if (cda[CTA_TUPLE_REPLY])
1631 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1639 h = nf_conntrack_find_get(net, &zone, &tuple);
1643 ct = nf_ct_tuplehash_to_ctrack(h);
1646 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1652 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1653 NFNL_MSG_TYPE(nlh->nlmsg_type), ct, true, 0);
1658 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1667 /* this avoids a loop in nfnetlink. */
1668 return err == -EAGAIN ? -ENOBUFS : err;
1671 static int ctnetlink_done_list(struct netlink_callback *cb)
1674 nf_ct_put((struct nf_conn *)cb->args[1]);
1679 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1681 struct nf_conn *ct, *last;
1682 struct nf_conntrack_tuple_hash *h;
1683 struct hlist_nulls_node *n;
1684 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1685 u_int8_t l3proto = nfmsg->nfgen_family;
1688 struct hlist_nulls_head *list;
1689 struct net *net = sock_net(skb->sk);
1694 last = (struct nf_conn *)cb->args[1];
1696 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1697 struct ct_pcpu *pcpu;
1699 if (!cpu_possible(cpu))
1702 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1703 spin_lock_bh(&pcpu->lock);
1704 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1706 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1707 ct = nf_ct_tuplehash_to_ctrack(h);
1708 if (l3proto && nf_ct_l3num(ct) != l3proto)
1716 /* We can't dump extension info for the unconfirmed
1717 * list because unconfirmed conntracks can have
1718 * ct->ext reallocated (and thus freed).
1720 * In the dying list case ct->ext can't be free'd
1721 * until after we drop pcpu->lock.
1723 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1725 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1726 ct, dying ? true : false, 0);
1728 if (!atomic_inc_not_zero(&ct->ct_general.use))
1731 cb->args[1] = (unsigned long)ct;
1732 spin_unlock_bh(&pcpu->lock);
1740 spin_unlock_bh(&pcpu->lock);
1751 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1753 return ctnetlink_dump_list(skb, cb, true);
1756 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1757 struct sk_buff *skb,
1758 const struct nlmsghdr *nlh,
1759 const struct nlattr * const cda[],
1760 struct netlink_ext_ack *extack)
1762 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1763 struct netlink_dump_control c = {
1764 .dump = ctnetlink_dump_dying,
1765 .done = ctnetlink_done_list,
1767 return netlink_dump_start(ctnl, skb, nlh, &c);
1774 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1776 return ctnetlink_dump_list(skb, cb, false);
1779 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1780 struct sk_buff *skb,
1781 const struct nlmsghdr *nlh,
1782 const struct nlattr * const cda[],
1783 struct netlink_ext_ack *extack)
1785 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1786 struct netlink_dump_control c = {
1787 .dump = ctnetlink_dump_unconfirmed,
1788 .done = ctnetlink_done_list,
1790 return netlink_dump_start(ctnl, skb, nlh, &c);
1796 #if IS_ENABLED(CONFIG_NF_NAT)
1798 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1799 enum nf_nat_manip_type manip,
1800 const struct nlattr *attr)
1803 struct nf_nat_hook *nat_hook;
1806 nat_hook = rcu_dereference(nf_nat_hook);
1808 #ifdef CONFIG_MODULES
1810 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1811 if (request_module("nf-nat") < 0) {
1812 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1816 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1818 nat_hook = rcu_dereference(nf_nat_hook);
1825 err = nat_hook->parse_nat_setup(ct, manip, attr);
1826 if (err == -EAGAIN) {
1827 #ifdef CONFIG_MODULES
1829 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1830 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1831 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1835 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1846 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1851 /* Ignore these unchangable bits */
1852 on &= ~IPS_UNCHANGEABLE_MASK;
1853 off &= ~IPS_UNCHANGEABLE_MASK;
1855 for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1856 if (on & (1 << bit))
1857 set_bit(bit, &ct->status);
1858 else if (off & (1 << bit))
1859 clear_bit(bit, &ct->status);
1864 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1867 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1868 d = ct->status ^ status;
1870 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1874 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1875 /* SEEN_REPLY bit can only be set */
1878 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1879 /* ASSURED bit can only be set */
1882 __ctnetlink_change_status(ct, status, 0);
1887 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1889 #if IS_ENABLED(CONFIG_NF_NAT)
1892 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1895 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1900 return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1903 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1909 static int ctnetlink_change_helper(struct nf_conn *ct,
1910 const struct nlattr * const cda[])
1912 struct nf_conntrack_helper *helper;
1913 struct nf_conn_help *help = nfct_help(ct);
1914 char *helpname = NULL;
1915 struct nlattr *helpinfo = NULL;
1918 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1922 /* don't change helper of sibling connections */
1924 /* If we try to change the helper to the same thing twice,
1925 * treat the second attempt as a no-op instead of returning
1931 helper = rcu_dereference(help->helper);
1932 if (helper && !strcmp(helper->name, helpname))
1940 if (!strcmp(helpname, "")) {
1941 if (help && help->helper) {
1942 /* we had a helper before ... */
1943 nf_ct_remove_expectations(ct);
1944 RCU_INIT_POINTER(help->helper, NULL);
1951 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1952 nf_ct_protonum(ct));
1953 if (helper == NULL) {
1959 if (help->helper == helper) {
1960 /* update private helper data if allowed. */
1961 if (helper->from_nlattr)
1962 helper->from_nlattr(helpinfo, ct);
1967 /* we cannot set a helper for an existing conntrack */
1975 static int ctnetlink_change_timeout(struct nf_conn *ct,
1976 const struct nlattr * const cda[])
1978 u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1980 if (timeout > INT_MAX)
1982 ct->timeout = nfct_time_stamp + (u32)timeout;
1984 if (test_bit(IPS_DYING_BIT, &ct->status))
1990 #if defined(CONFIG_NF_CONNTRACK_MARK)
1991 static void ctnetlink_change_mark(struct nf_conn *ct,
1992 const struct nlattr * const cda[])
1994 u32 mark, newmark, mask = 0;
1996 if (cda[CTA_MARK_MASK])
1997 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1999 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2000 newmark = (ct->mark & mask) ^ mark;
2001 if (newmark != ct->mark)
2006 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
2007 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
2008 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
2009 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
2012 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
2013 const struct nlattr * const cda[])
2015 const struct nlattr *attr = cda[CTA_PROTOINFO];
2016 const struct nf_conntrack_l4proto *l4proto;
2017 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
2020 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
2021 protoinfo_policy, NULL);
2025 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
2026 if (l4proto->from_nlattr)
2027 err = l4proto->from_nlattr(tb, ct);
2032 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
2033 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
2034 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
2035 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
2038 static int change_seq_adj(struct nf_ct_seqadj *seq,
2039 const struct nlattr * const attr)
2042 struct nlattr *cda[CTA_SEQADJ_MAX+1];
2044 err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
2045 seqadj_policy, NULL);
2049 if (!cda[CTA_SEQADJ_CORRECTION_POS])
2052 seq->correction_pos =
2053 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
2055 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
2058 seq->offset_before =
2059 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
2061 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
2065 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
2071 ctnetlink_change_seq_adj(struct nf_conn *ct,
2072 const struct nlattr * const cda[])
2074 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
2080 spin_lock_bh(&ct->lock);
2081 if (cda[CTA_SEQ_ADJ_ORIG]) {
2082 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
2083 cda[CTA_SEQ_ADJ_ORIG]);
2087 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2090 if (cda[CTA_SEQ_ADJ_REPLY]) {
2091 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
2092 cda[CTA_SEQ_ADJ_REPLY]);
2096 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2099 spin_unlock_bh(&ct->lock);
2102 spin_unlock_bh(&ct->lock);
2106 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
2107 [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
2108 [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
2109 [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
2112 static int ctnetlink_change_synproxy(struct nf_conn *ct,
2113 const struct nlattr * const cda[])
2115 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
2116 struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
2122 err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
2123 cda[CTA_SYNPROXY], synproxy_policy,
2128 if (!tb[CTA_SYNPROXY_ISN] ||
2129 !tb[CTA_SYNPROXY_ITS] ||
2130 !tb[CTA_SYNPROXY_TSOFF])
2133 synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
2134 synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
2135 synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
2141 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
2143 #ifdef CONFIG_NF_CONNTRACK_LABELS
2144 size_t len = nla_len(cda[CTA_LABELS]);
2145 const void *mask = cda[CTA_LABELS_MASK];
2147 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
2151 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
2152 nla_len(cda[CTA_LABELS_MASK]) != len)
2154 mask = nla_data(cda[CTA_LABELS_MASK]);
2159 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
2166 ctnetlink_change_conntrack(struct nf_conn *ct,
2167 const struct nlattr * const cda[])
2171 /* only allow NAT changes and master assignation for new conntracks */
2172 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
2175 if (cda[CTA_HELP]) {
2176 err = ctnetlink_change_helper(ct, cda);
2181 if (cda[CTA_TIMEOUT]) {
2182 err = ctnetlink_change_timeout(ct, cda);
2187 if (cda[CTA_STATUS]) {
2188 err = ctnetlink_change_status(ct, cda);
2193 if (cda[CTA_PROTOINFO]) {
2194 err = ctnetlink_change_protoinfo(ct, cda);
2199 #if defined(CONFIG_NF_CONNTRACK_MARK)
2201 ctnetlink_change_mark(ct, cda);
2204 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2205 err = ctnetlink_change_seq_adj(ct, cda);
2210 if (cda[CTA_SYNPROXY]) {
2211 err = ctnetlink_change_synproxy(ct, cda);
2216 if (cda[CTA_LABELS]) {
2217 err = ctnetlink_attach_labels(ct, cda);
2225 static struct nf_conn *
2226 ctnetlink_create_conntrack(struct net *net,
2227 const struct nf_conntrack_zone *zone,
2228 const struct nlattr * const cda[],
2229 struct nf_conntrack_tuple *otuple,
2230 struct nf_conntrack_tuple *rtuple,
2235 struct nf_conntrack_helper *helper;
2236 struct nf_conn_tstamp *tstamp;
2239 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
2241 return ERR_PTR(-ENOMEM);
2243 if (!cda[CTA_TIMEOUT])
2246 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2247 if (timeout > INT_MAX)
2249 ct->timeout = (u32)timeout + nfct_time_stamp;
2252 if (cda[CTA_HELP]) {
2253 char *helpname = NULL;
2254 struct nlattr *helpinfo = NULL;
2256 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
2260 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2261 nf_ct_protonum(ct));
2262 if (helper == NULL) {
2264 #ifdef CONFIG_MODULES
2265 if (request_module("nfct-helper-%s", helpname) < 0) {
2271 helper = __nf_conntrack_helper_find(helpname,
2273 nf_ct_protonum(ct));
2283 struct nf_conn_help *help;
2285 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2290 /* set private helper data if allowed. */
2291 if (helper->from_nlattr)
2292 helper->from_nlattr(helpinfo, ct);
2294 /* not in hash table yet so not strictly necessary */
2295 RCU_INIT_POINTER(help->helper, helper);
2298 /* try an implicit helper assignation */
2299 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
2304 err = ctnetlink_setup_nat(ct, cda);
2308 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2309 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2310 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2311 nf_ct_labels_ext_add(ct);
2312 nfct_seqadj_ext_add(ct);
2313 nfct_synproxy_ext_add(ct);
2315 /* we must add conntrack extensions before confirmation. */
2316 ct->status |= IPS_CONFIRMED;
2318 if (cda[CTA_STATUS]) {
2319 err = ctnetlink_change_status(ct, cda);
2324 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2325 err = ctnetlink_change_seq_adj(ct, cda);
2330 memset(&ct->proto, 0, sizeof(ct->proto));
2331 if (cda[CTA_PROTOINFO]) {
2332 err = ctnetlink_change_protoinfo(ct, cda);
2337 if (cda[CTA_SYNPROXY]) {
2338 err = ctnetlink_change_synproxy(ct, cda);
2343 #if defined(CONFIG_NF_CONNTRACK_MARK)
2345 ctnetlink_change_mark(ct, cda);
2348 /* setup master conntrack: this is a confirmed expectation */
2349 if (cda[CTA_TUPLE_MASTER]) {
2350 struct nf_conntrack_tuple master;
2351 struct nf_conntrack_tuple_hash *master_h;
2352 struct nf_conn *master_ct;
2354 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2359 master_h = nf_conntrack_find_get(net, zone, &master);
2360 if (master_h == NULL) {
2364 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2365 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2366 ct->master = master_ct;
2368 tstamp = nf_conn_tstamp_find(ct);
2370 tstamp->start = ktime_get_real_ns();
2372 err = nf_conntrack_hash_check_insert(ct);
2383 nf_conntrack_free(ct);
2384 return ERR_PTR(err);
2387 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
2388 struct sk_buff *skb,
2389 const struct nlmsghdr *nlh,
2390 const struct nlattr * const cda[],
2391 struct netlink_ext_ack *extack)
2393 struct nf_conntrack_tuple otuple, rtuple;
2394 struct nf_conntrack_tuple_hash *h = NULL;
2395 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2397 u_int8_t u3 = nfmsg->nfgen_family;
2398 struct nf_conntrack_zone zone;
2401 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2405 if (cda[CTA_TUPLE_ORIG]) {
2406 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2412 if (cda[CTA_TUPLE_REPLY]) {
2413 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2419 if (cda[CTA_TUPLE_ORIG])
2420 h = nf_conntrack_find_get(net, &zone, &otuple);
2421 else if (cda[CTA_TUPLE_REPLY])
2422 h = nf_conntrack_find_get(net, &zone, &rtuple);
2426 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2427 enum ip_conntrack_events events;
2429 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2431 if (otuple.dst.protonum != rtuple.dst.protonum)
2434 ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
2440 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2441 events = 1 << IPCT_RELATED;
2443 events = 1 << IPCT_NEW;
2445 if (cda[CTA_LABELS] &&
2446 ctnetlink_attach_labels(ct, cda) == 0)
2447 events |= (1 << IPCT_LABEL);
2449 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2450 (1 << IPCT_ASSURED) |
2451 (1 << IPCT_HELPER) |
2452 (1 << IPCT_PROTOINFO) |
2453 (1 << IPCT_SEQADJ) |
2455 (1 << IPCT_SYNPROXY) |
2457 ct, NETLINK_CB(skb).portid,
2464 /* implicit 'else' */
2467 ct = nf_ct_tuplehash_to_ctrack(h);
2468 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
2469 err = ctnetlink_change_conntrack(ct, cda);
2471 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2472 (1 << IPCT_ASSURED) |
2473 (1 << IPCT_HELPER) |
2475 (1 << IPCT_PROTOINFO) |
2476 (1 << IPCT_SEQADJ) |
2478 (1 << IPCT_SYNPROXY),
2479 ct, NETLINK_CB(skb).portid,
2489 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2490 __u16 cpu, const struct ip_conntrack_stat *st)
2492 struct nlmsghdr *nlh;
2493 struct nfgenmsg *nfmsg;
2494 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2496 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2497 IPCTNL_MSG_CT_GET_STATS_CPU);
2498 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2502 nfmsg = nlmsg_data(nlh);
2503 nfmsg->nfgen_family = AF_UNSPEC;
2504 nfmsg->version = NFNETLINK_V0;
2505 nfmsg->res_id = htons(cpu);
2507 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2508 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2509 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2510 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2511 htonl(st->insert_failed)) ||
2512 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2513 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2514 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2515 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2516 htonl(st->search_restart)) ||
2517 nla_put_be32(skb, CTA_STATS_CLASH_RESOLVE,
2518 htonl(st->clash_resolve)))
2519 goto nla_put_failure;
2521 nlmsg_end(skb, nlh);
2526 nlmsg_cancel(skb, nlh);
2531 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2534 struct net *net = sock_net(skb->sk);
2536 if (cb->args[0] == nr_cpu_ids)
2539 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2540 const struct ip_conntrack_stat *st;
2542 if (!cpu_possible(cpu))
2545 st = per_cpu_ptr(net->ct.stat, cpu);
2546 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2547 NETLINK_CB(cb->skb).portid,
2557 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2558 struct sk_buff *skb,
2559 const struct nlmsghdr *nlh,
2560 const struct nlattr * const cda[],
2561 struct netlink_ext_ack *extack)
2563 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2564 struct netlink_dump_control c = {
2565 .dump = ctnetlink_ct_stat_cpu_dump,
2567 return netlink_dump_start(ctnl, skb, nlh, &c);
2574 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2577 struct nlmsghdr *nlh;
2578 struct nfgenmsg *nfmsg;
2579 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2580 unsigned int nr_conntracks = atomic_read(&net->ct.count);
2582 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2583 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2587 nfmsg = nlmsg_data(nlh);
2588 nfmsg->nfgen_family = AF_UNSPEC;
2589 nfmsg->version = NFNETLINK_V0;
2592 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2593 goto nla_put_failure;
2595 if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2596 goto nla_put_failure;
2598 nlmsg_end(skb, nlh);
2603 nlmsg_cancel(skb, nlh);
2607 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2608 struct sk_buff *skb, const struct nlmsghdr *nlh,
2609 const struct nlattr * const cda[],
2610 struct netlink_ext_ack *extack)
2612 struct sk_buff *skb2;
2615 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2619 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2621 NFNL_MSG_TYPE(nlh->nlmsg_type),
2626 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2635 /* this avoids a loop in nfnetlink. */
2636 return err == -EAGAIN ? -ENOBUFS : err;
2639 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2640 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2641 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2642 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2643 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2644 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2645 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2646 .len = NF_CT_HELPER_NAME_LEN - 1 },
2647 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2648 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2649 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2650 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2651 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2654 static struct nf_conntrack_expect *
2655 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2656 struct nf_conntrack_helper *helper,
2657 struct nf_conntrack_tuple *tuple,
2658 struct nf_conntrack_tuple *mask);
2660 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2662 ctnetlink_glue_build_size(const struct nf_conn *ct)
2664 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2665 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2666 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2667 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2668 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2669 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2670 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2671 + nla_total_size(0) /* CTA_PROTOINFO */
2672 + nla_total_size(0) /* CTA_HELP */
2673 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2674 + ctnetlink_secctx_size(ct)
2675 #if IS_ENABLED(CONFIG_NF_NAT)
2676 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2677 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2679 #ifdef CONFIG_NF_CONNTRACK_MARK
2680 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2682 #ifdef CONFIG_NF_CONNTRACK_ZONES
2683 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2685 + ctnetlink_proto_size(ct)
2689 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2690 enum ip_conntrack_info *ctinfo)
2692 return nf_ct_get(skb, ctinfo);
2695 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2697 const struct nf_conntrack_zone *zone;
2698 struct nlattr *nest_parms;
2700 zone = nf_ct_zone(ct);
2702 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2704 goto nla_put_failure;
2705 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2706 goto nla_put_failure;
2707 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2708 NF_CT_ZONE_DIR_ORIG) < 0)
2709 goto nla_put_failure;
2710 nla_nest_end(skb, nest_parms);
2712 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2714 goto nla_put_failure;
2715 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2716 goto nla_put_failure;
2717 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2718 NF_CT_ZONE_DIR_REPL) < 0)
2719 goto nla_put_failure;
2720 nla_nest_end(skb, nest_parms);
2722 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2723 NF_CT_DEFAULT_ZONE_DIR) < 0)
2724 goto nla_put_failure;
2726 if (ctnetlink_dump_id(skb, ct) < 0)
2727 goto nla_put_failure;
2729 if (ctnetlink_dump_status(skb, ct) < 0)
2730 goto nla_put_failure;
2732 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
2733 goto nla_put_failure;
2735 if (ctnetlink_dump_protoinfo(skb, ct, false) < 0)
2736 goto nla_put_failure;
2738 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2739 goto nla_put_failure;
2741 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2742 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2743 goto nla_put_failure;
2745 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2746 goto nla_put_failure;
2748 if ((ct->status & IPS_SEQ_ADJUST) &&
2749 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2750 goto nla_put_failure;
2752 if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2753 goto nla_put_failure;
2755 #ifdef CONFIG_NF_CONNTRACK_MARK
2756 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2757 goto nla_put_failure;
2759 if (ctnetlink_dump_labels(skb, ct) < 0)
2760 goto nla_put_failure;
2768 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2769 enum ip_conntrack_info ctinfo,
2770 u_int16_t ct_attr, u_int16_t ct_info_attr)
2772 struct nlattr *nest_parms;
2774 nest_parms = nla_nest_start(skb, ct_attr);
2776 goto nla_put_failure;
2778 if (__ctnetlink_glue_build(skb, ct) < 0)
2779 goto nla_put_failure;
2781 nla_nest_end(skb, nest_parms);
2783 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2784 goto nla_put_failure;
2793 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2795 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2796 unsigned long d = ct->status ^ status;
2798 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2799 /* SEEN_REPLY bit can only be set */
2802 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2803 /* ASSURED bit can only be set */
2806 /* This check is less strict than ctnetlink_change_status()
2807 * because callers often flip IPS_EXPECTED bits when sending
2808 * an NFQA_CT attribute to the kernel. So ignore the
2809 * unchangeable bits but do not error out. Also user programs
2810 * are allowed to clear the bits that they are allowed to change.
2812 __ctnetlink_change_status(ct, status, ~status);
2817 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2821 if (cda[CTA_TIMEOUT]) {
2822 err = ctnetlink_change_timeout(ct, cda);
2826 if (cda[CTA_STATUS]) {
2827 err = ctnetlink_update_status(ct, cda);
2831 if (cda[CTA_HELP]) {
2832 err = ctnetlink_change_helper(ct, cda);
2836 if (cda[CTA_LABELS]) {
2837 err = ctnetlink_attach_labels(ct, cda);
2841 #if defined(CONFIG_NF_CONNTRACK_MARK)
2842 if (cda[CTA_MARK]) {
2843 ctnetlink_change_mark(ct, cda);
2850 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2852 struct nlattr *cda[CTA_MAX+1];
2855 ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2860 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2863 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2864 const struct nf_conn *ct,
2865 struct nf_conntrack_tuple *tuple,
2866 struct nf_conntrack_tuple *mask)
2870 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2871 nf_ct_l3num(ct), NULL);
2875 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2876 nf_ct_l3num(ct), NULL);
2880 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2881 u32 portid, u32 report)
2883 struct nlattr *cda[CTA_EXPECT_MAX+1];
2884 struct nf_conntrack_tuple tuple, mask;
2885 struct nf_conntrack_helper *helper = NULL;
2886 struct nf_conntrack_expect *exp;
2889 err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2890 exp_nla_policy, NULL);
2894 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2899 if (cda[CTA_EXPECT_HELP_NAME]) {
2900 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2902 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2903 nf_ct_protonum(ct));
2908 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2909 helper, &tuple, &mask);
2911 return PTR_ERR(exp);
2913 err = nf_ct_expect_related_report(exp, portid, report, 0);
2914 nf_ct_expect_put(exp);
2918 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2919 enum ip_conntrack_info ctinfo, int diff)
2921 if (!(ct->status & IPS_NAT_MASK))
2924 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2927 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2928 .get_ct = ctnetlink_glue_get_ct,
2929 .build_size = ctnetlink_glue_build_size,
2930 .build = ctnetlink_glue_build,
2931 .parse = ctnetlink_glue_parse,
2932 .attach_expect = ctnetlink_glue_attach_expect,
2933 .seq_adjust = ctnetlink_glue_seqadj,
2935 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2937 /***********************************************************************
2939 ***********************************************************************/
2941 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2942 const struct nf_conntrack_tuple *tuple,
2945 struct nlattr *nest_parms;
2947 nest_parms = nla_nest_start(skb, type);
2949 goto nla_put_failure;
2950 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2951 goto nla_put_failure;
2952 nla_nest_end(skb, nest_parms);
2960 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2961 const struct nf_conntrack_tuple *tuple,
2962 const struct nf_conntrack_tuple_mask *mask)
2964 const struct nf_conntrack_l4proto *l4proto;
2965 struct nf_conntrack_tuple m;
2966 struct nlattr *nest_parms;
2969 memset(&m, 0xFF, sizeof(m));
2970 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2971 m.src.u.all = mask->src.u.all;
2972 m.dst.protonum = tuple->dst.protonum;
2974 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2976 goto nla_put_failure;
2979 ret = ctnetlink_dump_tuples_ip(skb, &m);
2981 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2982 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2986 if (unlikely(ret < 0))
2987 goto nla_put_failure;
2989 nla_nest_end(skb, nest_parms);
2997 static const union nf_inet_addr any_addr;
2999 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
3001 static __read_mostly siphash_key_t exp_id_seed;
3002 unsigned long a, b, c, d;
3004 net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
3006 a = (unsigned long)exp;
3007 b = (unsigned long)exp->helper;
3008 c = (unsigned long)exp->master;
3009 d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
3012 return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
3014 return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
3019 ctnetlink_exp_dump_expect(struct sk_buff *skb,
3020 const struct nf_conntrack_expect *exp)
3022 struct nf_conn *master = exp->master;
3023 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
3024 struct nf_conn_help *help;
3025 #if IS_ENABLED(CONFIG_NF_NAT)
3026 struct nlattr *nest_parms;
3027 struct nf_conntrack_tuple nat_tuple = {};
3029 struct nf_ct_helper_expectfn *expfn;
3034 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
3035 goto nla_put_failure;
3036 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
3037 goto nla_put_failure;
3038 if (ctnetlink_exp_dump_tuple(skb,
3039 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
3040 CTA_EXPECT_MASTER) < 0)
3041 goto nla_put_failure;
3043 #if IS_ENABLED(CONFIG_NF_NAT)
3044 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
3045 exp->saved_proto.all) {
3046 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
3048 goto nla_put_failure;
3050 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
3051 goto nla_put_failure;
3053 nat_tuple.src.l3num = nf_ct_l3num(master);
3054 nat_tuple.src.u3 = exp->saved_addr;
3055 nat_tuple.dst.protonum = nf_ct_protonum(master);
3056 nat_tuple.src.u = exp->saved_proto;
3058 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
3059 CTA_EXPECT_NAT_TUPLE) < 0)
3060 goto nla_put_failure;
3061 nla_nest_end(skb, nest_parms);
3064 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
3065 nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
3066 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
3067 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
3068 goto nla_put_failure;
3069 help = nfct_help(master);
3071 struct nf_conntrack_helper *helper;
3073 helper = rcu_dereference(help->helper);
3075 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
3076 goto nla_put_failure;
3078 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
3079 if (expfn != NULL &&
3080 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
3081 goto nla_put_failure;
3090 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
3091 int event, const struct nf_conntrack_expect *exp)
3093 struct nlmsghdr *nlh;
3094 struct nfgenmsg *nfmsg;
3095 unsigned int flags = portid ? NLM_F_MULTI : 0;
3097 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
3098 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3102 nfmsg = nlmsg_data(nlh);
3103 nfmsg->nfgen_family = exp->tuple.src.l3num;
3104 nfmsg->version = NFNETLINK_V0;
3107 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3108 goto nla_put_failure;
3110 nlmsg_end(skb, nlh);
3115 nlmsg_cancel(skb, nlh);
3119 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3121 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
3123 struct nf_conntrack_expect *exp = item->exp;
3124 struct net *net = nf_ct_exp_net(exp);
3125 struct nlmsghdr *nlh;
3126 struct nfgenmsg *nfmsg;
3127 struct sk_buff *skb;
3128 unsigned int type, group;
3131 if (events & (1 << IPEXP_DESTROY)) {
3132 type = IPCTNL_MSG_EXP_DELETE;
3133 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
3134 } else if (events & (1 << IPEXP_NEW)) {
3135 type = IPCTNL_MSG_EXP_NEW;
3136 flags = NLM_F_CREATE|NLM_F_EXCL;
3137 group = NFNLGRP_CONNTRACK_EXP_NEW;
3141 if (!item->report && !nfnetlink_has_listeners(net, group))
3144 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
3148 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
3149 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
3153 nfmsg = nlmsg_data(nlh);
3154 nfmsg->nfgen_family = exp->tuple.src.l3num;
3155 nfmsg->version = NFNETLINK_V0;
3158 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3159 goto nla_put_failure;
3161 nlmsg_end(skb, nlh);
3162 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
3166 nlmsg_cancel(skb, nlh);
3170 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
3174 static int ctnetlink_exp_done(struct netlink_callback *cb)
3177 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
3182 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3184 struct net *net = sock_net(skb->sk);
3185 struct nf_conntrack_expect *exp, *last;
3186 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3187 u_int8_t l3proto = nfmsg->nfgen_family;
3190 last = (struct nf_conntrack_expect *)cb->args[1];
3191 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
3193 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
3195 if (l3proto && exp->tuple.src.l3num != l3proto)
3198 if (!net_eq(nf_ct_net(exp->master), net))
3206 if (ctnetlink_exp_fill_info(skb,
3207 NETLINK_CB(cb->skb).portid,
3211 if (!refcount_inc_not_zero(&exp->use))
3213 cb->args[1] = (unsigned long)exp;
3225 nf_ct_expect_put(last);
3231 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3233 struct nf_conntrack_expect *exp, *last;
3234 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3235 struct nf_conn *ct = cb->data;
3236 struct nf_conn_help *help = nfct_help(ct);
3237 u_int8_t l3proto = nfmsg->nfgen_family;
3243 last = (struct nf_conntrack_expect *)cb->args[1];
3245 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
3246 if (l3proto && exp->tuple.src.l3num != l3proto)
3253 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
3257 if (!refcount_inc_not_zero(&exp->use))
3259 cb->args[1] = (unsigned long)exp;
3271 nf_ct_expect_put(last);
3276 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
3277 struct sk_buff *skb,
3278 const struct nlmsghdr *nlh,
3279 const struct nlattr * const cda[],
3280 struct netlink_ext_ack *extack)
3283 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3284 u_int8_t u3 = nfmsg->nfgen_family;
3285 struct nf_conntrack_tuple tuple;
3286 struct nf_conntrack_tuple_hash *h;
3288 struct nf_conntrack_zone zone;
3289 struct netlink_dump_control c = {
3290 .dump = ctnetlink_exp_ct_dump_table,
3291 .done = ctnetlink_exp_done,
3294 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3299 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3303 h = nf_conntrack_find_get(net, &zone, &tuple);
3307 ct = nf_ct_tuplehash_to_ctrack(h);
3308 /* No expectation linked to this connection tracking. */
3309 if (!nfct_help(ct)) {
3316 err = netlink_dump_start(ctnl, skb, nlh, &c);
3322 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
3323 struct sk_buff *skb, const struct nlmsghdr *nlh,
3324 const struct nlattr * const cda[],
3325 struct netlink_ext_ack *extack)
3327 struct nf_conntrack_tuple tuple;
3328 struct nf_conntrack_expect *exp;
3329 struct sk_buff *skb2;
3330 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3331 u_int8_t u3 = nfmsg->nfgen_family;
3332 struct nf_conntrack_zone zone;
3335 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3336 if (cda[CTA_EXPECT_MASTER])
3337 return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda,
3340 struct netlink_dump_control c = {
3341 .dump = ctnetlink_exp_dump_table,
3342 .done = ctnetlink_exp_done,
3344 return netlink_dump_start(ctnl, skb, nlh, &c);
3348 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3352 if (cda[CTA_EXPECT_TUPLE])
3353 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3355 else if (cda[CTA_EXPECT_MASTER])
3356 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3364 exp = nf_ct_expect_find_get(net, &zone, &tuple);
3368 if (cda[CTA_EXPECT_ID]) {
3369 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3371 if (id != nf_expect_get_id(exp)) {
3372 nf_ct_expect_put(exp);
3378 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3380 nf_ct_expect_put(exp);
3385 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3386 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
3388 nf_ct_expect_put(exp);
3392 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
3401 /* this avoids a loop in nfnetlink. */
3402 return err == -EAGAIN ? -ENOBUFS : err;
3405 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3407 const struct nf_conn_help *m_help;
3408 const char *name = data;
3410 m_help = nfct_help(exp->master);
3412 return strcmp(m_help->helper->name, name) == 0;
3415 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3420 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
3421 struct sk_buff *skb, const struct nlmsghdr *nlh,
3422 const struct nlattr * const cda[],
3423 struct netlink_ext_ack *extack)
3425 struct nf_conntrack_expect *exp;
3426 struct nf_conntrack_tuple tuple;
3427 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3428 u_int8_t u3 = nfmsg->nfgen_family;
3429 struct nf_conntrack_zone zone;
3432 if (cda[CTA_EXPECT_TUPLE]) {
3433 /* delete a single expect by tuple */
3434 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3438 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3443 /* bump usage count to 2 */
3444 exp = nf_ct_expect_find_get(net, &zone, &tuple);
3448 if (cda[CTA_EXPECT_ID]) {
3449 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3450 if (ntohl(id) != (u32)(unsigned long)exp) {
3451 nf_ct_expect_put(exp);
3456 /* after list removal, usage count == 1 */
3457 spin_lock_bh(&nf_conntrack_expect_lock);
3458 if (del_timer(&exp->timeout)) {
3459 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3461 nf_ct_expect_put(exp);
3463 spin_unlock_bh(&nf_conntrack_expect_lock);
3464 /* have to put what we 'get' above.
3465 * after this line usage count == 0 */
3466 nf_ct_expect_put(exp);
3467 } else if (cda[CTA_EXPECT_HELP_NAME]) {
3468 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3470 nf_ct_expect_iterate_net(net, expect_iter_name, name,
3471 NETLINK_CB(skb).portid,
3474 /* This basically means we have to flush everything*/
3475 nf_ct_expect_iterate_net(net, expect_iter_all, NULL,
3476 NETLINK_CB(skb).portid,
3483 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3484 const struct nlattr * const cda[])
3486 if (cda[CTA_EXPECT_TIMEOUT]) {
3487 if (!del_timer(&x->timeout))
3490 x->timeout.expires = jiffies +
3491 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3492 add_timer(&x->timeout);
3497 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3498 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3499 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3503 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3504 struct nf_conntrack_expect *exp,
3507 #if IS_ENABLED(CONFIG_NF_NAT)
3508 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3509 struct nf_conntrack_tuple nat_tuple = {};
3512 err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3513 exp_nat_nla_policy, NULL);
3517 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3520 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3521 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3526 exp->saved_addr = nat_tuple.src.u3;
3527 exp->saved_proto = nat_tuple.src.u;
3528 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3536 static struct nf_conntrack_expect *
3537 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3538 struct nf_conntrack_helper *helper,
3539 struct nf_conntrack_tuple *tuple,
3540 struct nf_conntrack_tuple *mask)
3542 u_int32_t class = 0;
3543 struct nf_conntrack_expect *exp;
3544 struct nf_conn_help *help;
3547 help = nfct_help(ct);
3549 return ERR_PTR(-EOPNOTSUPP);
3551 if (cda[CTA_EXPECT_CLASS] && helper) {
3552 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3553 if (class > helper->expect_class_max)
3554 return ERR_PTR(-EINVAL);
3556 exp = nf_ct_expect_alloc(ct);
3558 return ERR_PTR(-ENOMEM);
3560 if (cda[CTA_EXPECT_FLAGS]) {
3561 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3562 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3566 if (cda[CTA_EXPECT_FN]) {
3567 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3568 struct nf_ct_helper_expectfn *expfn;
3570 expfn = nf_ct_helper_expectfn_find_by_name(name);
3571 if (expfn == NULL) {
3575 exp->expectfn = expfn->expectfn;
3577 exp->expectfn = NULL;
3581 exp->helper = helper;
3582 exp->tuple = *tuple;
3583 exp->mask.src.u3 = mask->src.u3;
3584 exp->mask.src.u.all = mask->src.u.all;
3586 if (cda[CTA_EXPECT_NAT]) {
3587 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3588 exp, nf_ct_l3num(ct));
3594 nf_ct_expect_put(exp);
3595 return ERR_PTR(err);
3599 ctnetlink_create_expect(struct net *net,
3600 const struct nf_conntrack_zone *zone,
3601 const struct nlattr * const cda[],
3602 u_int8_t u3, u32 portid, int report)
3604 struct nf_conntrack_tuple tuple, mask, master_tuple;
3605 struct nf_conntrack_tuple_hash *h = NULL;
3606 struct nf_conntrack_helper *helper = NULL;
3607 struct nf_conntrack_expect *exp;
3611 /* caller guarantees that those three CTA_EXPECT_* exist */
3612 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3616 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3620 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3625 /* Look for master conntrack of this expectation */
3626 h = nf_conntrack_find_get(net, zone, &master_tuple);
3629 ct = nf_ct_tuplehash_to_ctrack(h);
3632 if (cda[CTA_EXPECT_HELP_NAME]) {
3633 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3635 helper = __nf_conntrack_helper_find(helpname, u3,
3636 nf_ct_protonum(ct));
3637 if (helper == NULL) {
3639 #ifdef CONFIG_MODULES
3640 if (request_module("nfct-helper-%s", helpname) < 0) {
3645 helper = __nf_conntrack_helper_find(helpname, u3,
3646 nf_ct_protonum(ct));
3658 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3664 err = nf_ct_expect_related_report(exp, portid, report, 0);
3665 nf_ct_expect_put(exp);
3673 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3674 struct sk_buff *skb, const struct nlmsghdr *nlh,
3675 const struct nlattr * const cda[],
3676 struct netlink_ext_ack *extack)
3678 struct nf_conntrack_tuple tuple;
3679 struct nf_conntrack_expect *exp;
3680 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3681 u_int8_t u3 = nfmsg->nfgen_family;
3682 struct nf_conntrack_zone zone;
3685 if (!cda[CTA_EXPECT_TUPLE]
3686 || !cda[CTA_EXPECT_MASK]
3687 || !cda[CTA_EXPECT_MASTER])
3690 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3694 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3699 spin_lock_bh(&nf_conntrack_expect_lock);
3700 exp = __nf_ct_expect_find(net, &zone, &tuple);
3702 spin_unlock_bh(&nf_conntrack_expect_lock);
3704 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3705 err = ctnetlink_create_expect(net, &zone, cda, u3,
3706 NETLINK_CB(skb).portid,
3713 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3714 err = ctnetlink_change_expect(exp, cda);
3715 spin_unlock_bh(&nf_conntrack_expect_lock);
3721 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3722 const struct ip_conntrack_stat *st)
3724 struct nlmsghdr *nlh;
3725 struct nfgenmsg *nfmsg;
3726 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3728 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3729 IPCTNL_MSG_EXP_GET_STATS_CPU);
3730 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3734 nfmsg = nlmsg_data(nlh);
3735 nfmsg->nfgen_family = AF_UNSPEC;
3736 nfmsg->version = NFNETLINK_V0;
3737 nfmsg->res_id = htons(cpu);
3739 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3740 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3741 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3742 goto nla_put_failure;
3744 nlmsg_end(skb, nlh);
3749 nlmsg_cancel(skb, nlh);
3754 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3757 struct net *net = sock_net(skb->sk);
3759 if (cb->args[0] == nr_cpu_ids)
3762 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3763 const struct ip_conntrack_stat *st;
3765 if (!cpu_possible(cpu))
3768 st = per_cpu_ptr(net->ct.stat, cpu);
3769 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3779 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3780 struct sk_buff *skb,
3781 const struct nlmsghdr *nlh,
3782 const struct nlattr * const cda[],
3783 struct netlink_ext_ack *extack)
3785 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3786 struct netlink_dump_control c = {
3787 .dump = ctnetlink_exp_stat_cpu_dump,
3789 return netlink_dump_start(ctnl, skb, nlh, &c);
3795 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3796 static struct nf_ct_event_notifier ctnl_notifier = {
3797 .fcn = ctnetlink_conntrack_event,
3800 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3801 .fcn = ctnetlink_expect_event,
3805 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3806 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3807 .attr_count = CTA_MAX,
3808 .policy = ct_nla_policy },
3809 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3810 .attr_count = CTA_MAX,
3811 .policy = ct_nla_policy },
3812 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3813 .attr_count = CTA_MAX,
3814 .policy = ct_nla_policy },
3815 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3816 .attr_count = CTA_MAX,
3817 .policy = ct_nla_policy },
3818 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3819 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3820 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3821 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3824 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3825 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3826 .attr_count = CTA_EXPECT_MAX,
3827 .policy = exp_nla_policy },
3828 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3829 .attr_count = CTA_EXPECT_MAX,
3830 .policy = exp_nla_policy },
3831 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3832 .attr_count = CTA_EXPECT_MAX,
3833 .policy = exp_nla_policy },
3834 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3837 static const struct nfnetlink_subsystem ctnl_subsys = {
3838 .name = "conntrack",
3839 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3840 .cb_count = IPCTNL_MSG_MAX,
3844 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3845 .name = "conntrack_expect",
3846 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3847 .cb_count = IPCTNL_MSG_EXP_MAX,
3851 MODULE_ALIAS("ip_conntrack_netlink");
3852 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3853 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3855 static int __net_init ctnetlink_net_init(struct net *net)
3857 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3860 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3862 pr_err("ctnetlink_init: cannot register notifier.\n");
3866 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3868 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3869 goto err_unreg_notifier;
3874 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3876 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3882 static void ctnetlink_net_exit(struct net *net)
3884 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3885 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3886 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3890 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3894 list_for_each_entry(net, net_exit_list, exit_list)
3895 ctnetlink_net_exit(net);
3897 /* wait for other cpus until they are done with ctnl_notifiers */
3901 static struct pernet_operations ctnetlink_net_ops = {
3902 .init = ctnetlink_net_init,
3903 .exit_batch = ctnetlink_net_exit_batch,
3906 static int __init ctnetlink_init(void)
3910 ret = nfnetlink_subsys_register(&ctnl_subsys);
3912 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3916 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3918 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3919 goto err_unreg_subsys;
3922 ret = register_pernet_subsys(&ctnetlink_net_ops);
3924 pr_err("ctnetlink_init: cannot register pernet operations\n");
3925 goto err_unreg_exp_subsys;
3927 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3928 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3929 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3933 err_unreg_exp_subsys:
3934 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3936 nfnetlink_subsys_unregister(&ctnl_subsys);
3941 static void __exit ctnetlink_exit(void)
3943 unregister_pernet_subsys(&ctnetlink_net_ops);
3944 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3945 nfnetlink_subsys_unregister(&ctnl_subsys);
3946 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3947 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3952 module_init(ctnetlink_init);
3953 module_exit(ctnetlink_exit);