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 struct ctnetlink_list_dump_ctx {
67 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
68 const struct nf_conntrack_tuple *tuple,
69 const struct nf_conntrack_l4proto *l4proto)
72 struct nlattr *nest_parms;
74 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO);
77 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
80 if (likely(l4proto->tuple_to_nlattr))
81 ret = l4proto->tuple_to_nlattr(skb, tuple);
83 nla_nest_end(skb, nest_parms);
91 static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
92 const struct nf_conntrack_tuple *tuple)
94 if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
95 nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
100 static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
101 const struct nf_conntrack_tuple *tuple)
103 if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
104 nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
109 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
110 const struct nf_conntrack_tuple *tuple)
113 struct nlattr *nest_parms;
115 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP);
117 goto nla_put_failure;
119 switch (tuple->src.l3num) {
121 ret = ipv4_tuple_to_nlattr(skb, tuple);
124 ret = ipv6_tuple_to_nlattr(skb, tuple);
128 nla_nest_end(skb, nest_parms);
136 static int ctnetlink_dump_tuples(struct sk_buff *skb,
137 const struct nf_conntrack_tuple *tuple)
139 const struct nf_conntrack_l4proto *l4proto;
143 ret = ctnetlink_dump_tuples_ip(skb, tuple);
146 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
147 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
153 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
154 const struct nf_conntrack_zone *zone, int dir)
156 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
158 if (nla_put_be16(skb, attrtype, htons(zone->id)))
159 goto nla_put_failure;
166 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
168 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
169 goto nla_put_failure;
176 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct,
179 long timeout = nf_ct_expires(ct) / HZ;
181 if (skip_zero && timeout == 0)
184 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
185 goto nla_put_failure;
192 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct,
195 const struct nf_conntrack_l4proto *l4proto;
196 struct nlattr *nest_proto;
199 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
200 if (!l4proto->to_nlattr)
203 nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
205 goto nla_put_failure;
207 ret = l4proto->to_nlattr(skb, nest_proto, ct, destroy);
209 nla_nest_end(skb, nest_proto);
217 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
218 const struct nf_conn *ct)
220 struct nlattr *nest_helper;
221 const struct nf_conn_help *help = nfct_help(ct);
222 struct nf_conntrack_helper *helper;
228 helper = rcu_dereference(help->helper);
232 nest_helper = nla_nest_start(skb, CTA_HELP);
234 goto nla_put_failure;
235 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
236 goto nla_put_failure;
238 if (helper->to_nlattr)
239 helper->to_nlattr(skb, ct);
241 nla_nest_end(skb, nest_helper);
252 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
253 enum ip_conntrack_dir dir, int type)
255 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
256 struct nf_conn_counter *counter = acct->counter;
257 struct nlattr *nest_count;
260 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
261 pkts = atomic64_xchg(&counter[dir].packets, 0);
262 bytes = atomic64_xchg(&counter[dir].bytes, 0);
264 pkts = atomic64_read(&counter[dir].packets);
265 bytes = atomic64_read(&counter[dir].bytes);
268 nest_count = nla_nest_start(skb, attr);
270 goto nla_put_failure;
272 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
274 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
276 goto nla_put_failure;
278 nla_nest_end(skb, nest_count);
287 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
289 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
294 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
296 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
303 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
305 struct nlattr *nest_count;
306 const struct nf_conn_tstamp *tstamp;
308 tstamp = nf_conn_tstamp_find(ct);
312 nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
314 goto nla_put_failure;
316 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
317 CTA_TIMESTAMP_PAD) ||
318 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
319 cpu_to_be64(tstamp->stop),
321 goto nla_put_failure;
322 nla_nest_end(skb, nest_count);
330 #ifdef CONFIG_NF_CONNTRACK_MARK
331 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
333 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
334 goto nla_put_failure;
341 #define ctnetlink_dump_mark(a, b) (0)
344 #ifdef CONFIG_NF_CONNTRACK_SECMARK
345 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
347 struct nlattr *nest_secctx;
351 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
356 nest_secctx = nla_nest_start(skb, CTA_SECCTX);
358 goto nla_put_failure;
360 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
361 goto nla_put_failure;
362 nla_nest_end(skb, nest_secctx);
366 security_release_secctx(secctx, len);
370 #define ctnetlink_dump_secctx(a, b) (0)
373 #ifdef CONFIG_NF_CONNTRACK_LABELS
374 static inline int ctnetlink_label_size(const struct nf_conn *ct)
376 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
380 return nla_total_size(sizeof(labels->bits));
384 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
386 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
394 if (labels->bits[i] != 0)
395 return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
398 } while (i < ARRAY_SIZE(labels->bits));
403 #define ctnetlink_dump_labels(a, b) (0)
404 #define ctnetlink_label_size(a) (0)
407 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
409 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
411 struct nlattr *nest_parms;
413 if (!(ct->status & IPS_EXPECTED))
416 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
418 goto nla_put_failure;
419 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
420 goto nla_put_failure;
421 nla_nest_end(skb, nest_parms);
430 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
432 struct nlattr *nest_parms;
434 nest_parms = nla_nest_start(skb, type);
436 goto nla_put_failure;
438 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
439 htonl(seq->correction_pos)) ||
440 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
441 htonl(seq->offset_before)) ||
442 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
443 htonl(seq->offset_after)))
444 goto nla_put_failure;
446 nla_nest_end(skb, nest_parms);
454 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
456 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
457 struct nf_ct_seqadj *seq;
459 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
462 spin_lock_bh(&ct->lock);
463 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
464 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
467 seq = &seqadj->seq[IP_CT_DIR_REPLY];
468 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
471 spin_unlock_bh(&ct->lock);
474 spin_unlock_bh(&ct->lock);
478 static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
480 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
481 struct nlattr *nest_parms;
486 nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
488 goto nla_put_failure;
490 if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
491 nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
492 nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
493 goto nla_put_failure;
495 nla_nest_end(skb, nest_parms);
503 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
505 __be32 id = (__force __be32)nf_ct_get_id(ct);
507 if (nla_put_be32(skb, CTA_ID, id))
508 goto nla_put_failure;
515 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
517 if (nla_put_be32(skb, CTA_USE, htonl(refcount_read(&ct->ct_general.use))))
518 goto nla_put_failure;
525 /* all these functions access ct->ext. Caller must either hold a reference
526 * on ct or prevent its deletion by holding either the bucket spinlock or
527 * pcpu dying list lock.
529 static int ctnetlink_dump_extinfo(struct sk_buff *skb,
530 struct nf_conn *ct, u32 type)
532 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
533 ctnetlink_dump_timestamp(skb, ct) < 0 ||
534 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
535 ctnetlink_dump_labels(skb, ct) < 0 ||
536 ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
537 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
543 static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
545 if (ctnetlink_dump_status(skb, ct) < 0 ||
546 ctnetlink_dump_mark(skb, ct) < 0 ||
547 ctnetlink_dump_secctx(skb, ct) < 0 ||
548 ctnetlink_dump_id(skb, ct) < 0 ||
549 ctnetlink_dump_use(skb, ct) < 0 ||
550 ctnetlink_dump_master(skb, ct) < 0)
553 if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
554 (ctnetlink_dump_timeout(skb, ct, false) < 0 ||
555 ctnetlink_dump_protoinfo(skb, ct, false) < 0))
562 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
563 struct nf_conn *ct, bool extinfo, unsigned int flags)
565 const struct nf_conntrack_zone *zone;
566 struct nlmsghdr *nlh;
567 struct nlattr *nest_parms;
571 flags |= NLM_F_MULTI;
572 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
573 nlh = nfnl_msg_put(skb, portid, seq, event, flags, nf_ct_l3num(ct),
578 zone = nf_ct_zone(ct);
580 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
582 goto nla_put_failure;
583 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
584 goto nla_put_failure;
585 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
586 NF_CT_ZONE_DIR_ORIG) < 0)
587 goto nla_put_failure;
588 nla_nest_end(skb, nest_parms);
590 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
592 goto nla_put_failure;
593 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
594 goto nla_put_failure;
595 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
596 NF_CT_ZONE_DIR_REPL) < 0)
597 goto nla_put_failure;
598 nla_nest_end(skb, nest_parms);
600 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
601 NF_CT_DEFAULT_ZONE_DIR) < 0)
602 goto nla_put_failure;
604 if (ctnetlink_dump_info(skb, ct) < 0)
605 goto nla_put_failure;
606 if (extinfo && ctnetlink_dump_extinfo(skb, ct, type) < 0)
607 goto nla_put_failure;
614 nlmsg_cancel(skb, nlh);
618 static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
619 [CTA_IP_V4_SRC] = { .type = NLA_U32 },
620 [CTA_IP_V4_DST] = { .type = NLA_U32 },
621 [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
622 [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
625 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
626 static size_t ctnetlink_proto_size(const struct nf_conn *ct)
628 const struct nf_conntrack_l4proto *l4proto;
629 size_t len, len4 = 0;
631 len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
632 len *= 3u; /* ORIG, REPLY, MASTER */
634 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
635 len += l4proto->nlattr_size;
636 if (l4proto->nlattr_tuple_size) {
637 len4 = l4proto->nlattr_tuple_size();
638 len4 *= 3u; /* ORIG, REPLY, MASTER */
645 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
647 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
649 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
650 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
651 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
655 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
657 #ifdef CONFIG_NF_CONNTRACK_SECMARK
660 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
664 return nla_total_size(0) /* CTA_SECCTX */
665 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
671 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
673 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
674 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
676 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
682 #ifdef CONFIG_NF_CONNTRACK_EVENTS
683 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
685 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
686 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
687 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
688 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
689 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
690 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
691 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
692 + ctnetlink_acct_size(ct)
693 + ctnetlink_timestamp_size(ct)
694 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
695 + nla_total_size(0) /* CTA_PROTOINFO */
696 + nla_total_size(0) /* CTA_HELP */
697 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
698 + ctnetlink_secctx_size(ct)
699 #if IS_ENABLED(CONFIG_NF_NAT)
700 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
701 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
703 #ifdef CONFIG_NF_CONNTRACK_MARK
704 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
706 #ifdef CONFIG_NF_CONNTRACK_ZONES
707 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
709 + ctnetlink_proto_size(ct)
710 + ctnetlink_label_size(ct)
715 ctnetlink_conntrack_event(unsigned int events, const struct nf_ct_event *item)
717 const struct nf_conntrack_zone *zone;
719 struct nlmsghdr *nlh;
720 struct nlattr *nest_parms;
721 struct nf_conn *ct = item->ct;
724 unsigned int flags = 0, group;
727 if (events & (1 << IPCT_DESTROY)) {
728 type = IPCTNL_MSG_CT_DELETE;
729 group = NFNLGRP_CONNTRACK_DESTROY;
730 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
731 type = IPCTNL_MSG_CT_NEW;
732 flags = NLM_F_CREATE|NLM_F_EXCL;
733 group = NFNLGRP_CONNTRACK_NEW;
735 type = IPCTNL_MSG_CT_NEW;
736 group = NFNLGRP_CONNTRACK_UPDATE;
741 if (!item->report && !nfnetlink_has_listeners(net, group))
744 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
748 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
749 nlh = nfnl_msg_put(skb, item->portid, 0, type, flags, nf_ct_l3num(ct),
754 zone = nf_ct_zone(ct);
756 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
758 goto nla_put_failure;
759 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
760 goto nla_put_failure;
761 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
762 NF_CT_ZONE_DIR_ORIG) < 0)
763 goto nla_put_failure;
764 nla_nest_end(skb, nest_parms);
766 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
768 goto nla_put_failure;
769 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
770 goto nla_put_failure;
771 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
772 NF_CT_ZONE_DIR_REPL) < 0)
773 goto nla_put_failure;
774 nla_nest_end(skb, nest_parms);
776 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
777 NF_CT_DEFAULT_ZONE_DIR) < 0)
778 goto nla_put_failure;
780 if (ctnetlink_dump_id(skb, ct) < 0)
781 goto nla_put_failure;
783 if (ctnetlink_dump_status(skb, ct) < 0)
784 goto nla_put_failure;
786 if (events & (1 << IPCT_DESTROY)) {
787 if (ctnetlink_dump_timeout(skb, ct, true) < 0)
788 goto nla_put_failure;
790 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
791 ctnetlink_dump_timestamp(skb, ct) < 0 ||
792 ctnetlink_dump_protoinfo(skb, ct, true) < 0)
793 goto nla_put_failure;
795 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
796 goto nla_put_failure;
798 if (events & (1 << IPCT_PROTOINFO) &&
799 ctnetlink_dump_protoinfo(skb, ct, false) < 0)
800 goto nla_put_failure;
802 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
803 && ctnetlink_dump_helpinfo(skb, ct) < 0)
804 goto nla_put_failure;
806 #ifdef CONFIG_NF_CONNTRACK_SECMARK
807 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
808 && ctnetlink_dump_secctx(skb, ct) < 0)
809 goto nla_put_failure;
811 if (events & (1 << IPCT_LABEL) &&
812 ctnetlink_dump_labels(skb, ct) < 0)
813 goto nla_put_failure;
815 if (events & (1 << IPCT_RELATED) &&
816 ctnetlink_dump_master(skb, ct) < 0)
817 goto nla_put_failure;
819 if (events & (1 << IPCT_SEQADJ) &&
820 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
821 goto nla_put_failure;
823 if (events & (1 << IPCT_SYNPROXY) &&
824 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
825 goto nla_put_failure;
828 #ifdef CONFIG_NF_CONNTRACK_MARK
829 if ((events & (1 << IPCT_MARK) || ct->mark)
830 && ctnetlink_dump_mark(skb, ct) < 0)
831 goto nla_put_failure;
834 err = nfnetlink_send(skb, net, item->portid, group, item->report,
836 if (err == -ENOBUFS || err == -EAGAIN)
842 nlmsg_cancel(skb, nlh);
846 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
851 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
853 static int ctnetlink_done(struct netlink_callback *cb)
856 nf_ct_put((struct nf_conn *)cb->args[1]);
861 struct ctnetlink_filter_u32 {
866 struct ctnetlink_filter {
869 u_int32_t orig_flags;
870 u_int32_t reply_flags;
872 struct nf_conntrack_tuple orig;
873 struct nf_conntrack_tuple reply;
874 struct nf_conntrack_zone zone;
876 struct ctnetlink_filter_u32 mark;
877 struct ctnetlink_filter_u32 status;
880 static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
881 [CTA_FILTER_ORIG_FLAGS] = { .type = NLA_U32 },
882 [CTA_FILTER_REPLY_FLAGS] = { .type = NLA_U32 },
885 static int ctnetlink_parse_filter(const struct nlattr *attr,
886 struct ctnetlink_filter *filter)
888 struct nlattr *tb[CTA_FILTER_MAX + 1];
891 ret = nla_parse_nested(tb, CTA_FILTER_MAX, attr, cta_filter_nla_policy,
896 if (tb[CTA_FILTER_ORIG_FLAGS]) {
897 filter->orig_flags = nla_get_u32(tb[CTA_FILTER_ORIG_FLAGS]);
898 if (filter->orig_flags & ~CTA_FILTER_F_ALL)
902 if (tb[CTA_FILTER_REPLY_FLAGS]) {
903 filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
904 if (filter->reply_flags & ~CTA_FILTER_F_ALL)
911 static int ctnetlink_parse_zone(const struct nlattr *attr,
912 struct nf_conntrack_zone *zone);
913 static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
914 struct nf_conntrack_tuple *tuple,
915 u32 type, u_int8_t l3num,
916 struct nf_conntrack_zone *zone,
919 static int ctnetlink_filter_parse_mark(struct ctnetlink_filter_u32 *mark,
920 const struct nlattr * const cda[])
922 #ifdef CONFIG_NF_CONNTRACK_MARK
924 mark->val = ntohl(nla_get_be32(cda[CTA_MARK]));
926 if (cda[CTA_MARK_MASK])
927 mark->mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
929 mark->mask = 0xffffffff;
930 } else if (cda[CTA_MARK_MASK]) {
937 static int ctnetlink_filter_parse_status(struct ctnetlink_filter_u32 *status,
938 const struct nlattr * const cda[])
940 if (cda[CTA_STATUS]) {
941 status->val = ntohl(nla_get_be32(cda[CTA_STATUS]));
942 if (cda[CTA_STATUS_MASK])
943 status->mask = ntohl(nla_get_be32(cda[CTA_STATUS_MASK]));
945 status->mask = status->val;
947 /* status->val == 0? always true, else always false. */
948 if (status->mask == 0)
950 } else if (cda[CTA_STATUS_MASK]) {
954 /* CTA_STATUS is NLA_U32, if this fires UAPI needs to be extended */
955 BUILD_BUG_ON(__IPS_MAX_BIT >= 32);
959 static struct ctnetlink_filter *
960 ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
962 struct ctnetlink_filter *filter;
965 #ifndef CONFIG_NF_CONNTRACK_MARK
966 if (cda[CTA_MARK] || cda[CTA_MARK_MASK])
967 return ERR_PTR(-EOPNOTSUPP);
970 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
972 return ERR_PTR(-ENOMEM);
974 filter->family = family;
976 err = ctnetlink_filter_parse_mark(&filter->mark, cda);
980 err = ctnetlink_filter_parse_status(&filter->status, cda);
984 if (!cda[CTA_FILTER])
987 err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
991 err = ctnetlink_parse_filter(cda[CTA_FILTER], filter);
995 if (filter->orig_flags) {
996 if (!cda[CTA_TUPLE_ORIG]) {
1001 err = ctnetlink_parse_tuple_filter(cda, &filter->orig,
1005 filter->orig_flags);
1010 if (filter->reply_flags) {
1011 if (!cda[CTA_TUPLE_REPLY]) {
1016 err = ctnetlink_parse_tuple_filter(cda, &filter->reply,
1020 filter->reply_flags);
1030 return ERR_PTR(err);
1033 static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
1035 return family || cda[CTA_MARK] || cda[CTA_FILTER] || cda[CTA_STATUS];
1038 static int ctnetlink_start(struct netlink_callback *cb)
1040 const struct nlattr * const *cda = cb->data;
1041 struct ctnetlink_filter *filter = NULL;
1042 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1043 u8 family = nfmsg->nfgen_family;
1045 if (ctnetlink_needs_filter(family, cda)) {
1046 filter = ctnetlink_alloc_filter(cda, family);
1048 return PTR_ERR(filter);
1055 static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
1056 struct nf_conntrack_tuple *ct_tuple,
1057 u_int32_t flags, int family)
1061 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1062 filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
1065 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1066 filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
1070 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1071 !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
1072 &ct_tuple->src.u3.in6))
1075 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1076 !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
1077 &ct_tuple->dst.u3.in6))
1082 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
1083 filter_tuple->dst.protonum != ct_tuple->dst.protonum)
1086 switch (ct_tuple->dst.protonum) {
1089 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
1090 filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
1093 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
1094 filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
1098 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
1099 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1101 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
1102 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1104 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
1105 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1108 case IPPROTO_ICMPV6:
1109 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
1110 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1112 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
1113 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1115 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
1116 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1124 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
1126 struct ctnetlink_filter *filter = data;
1127 struct nf_conntrack_tuple *tuple;
1133 /* Match entries of a given L3 protocol number.
1134 * If it is not specified, ie. l3proto == 0,
1135 * then match everything.
1137 if (filter->family && nf_ct_l3num(ct) != filter->family)
1140 if (filter->orig_flags) {
1141 tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
1142 if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
1148 if (filter->reply_flags) {
1149 tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
1150 if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
1151 filter->reply_flags,
1156 #ifdef CONFIG_NF_CONNTRACK_MARK
1157 if ((ct->mark & filter->mark.mask) != filter->mark.val)
1160 status = (u32)READ_ONCE(ct->status);
1161 if ((status & filter->status.mask) != filter->status.val)
1172 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1174 unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
1175 struct net *net = sock_net(skb->sk);
1176 struct nf_conn *ct, *last;
1177 struct nf_conntrack_tuple_hash *h;
1178 struct hlist_nulls_node *n;
1179 struct nf_conn *nf_ct_evict[8];
1183 last = (struct nf_conn *)cb->args[1];
1187 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
1191 if (nf_ct_should_gc(nf_ct_evict[i]))
1192 nf_ct_kill(nf_ct_evict[i]);
1193 nf_ct_put(nf_ct_evict[i]);
1196 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
1197 nf_conntrack_lock(lockp);
1198 if (cb->args[0] >= nf_conntrack_htable_size) {
1202 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
1204 ct = nf_ct_tuplehash_to_ctrack(h);
1205 if (nf_ct_is_expired(ct)) {
1206 /* need to defer nf_ct_kill() until lock is released */
1207 if (i < ARRAY_SIZE(nf_ct_evict) &&
1208 refcount_inc_not_zero(&ct->ct_general.use))
1209 nf_ct_evict[i++] = ct;
1213 if (!net_eq(net, nf_ct_net(ct)))
1216 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
1224 if (!ctnetlink_filter_match(ct, cb->data))
1228 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1230 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1233 nf_conntrack_get(&ct->ct_general);
1234 cb->args[1] = (unsigned long)ct;
1248 /* nf ct hash resize happened, now clear the leftover. */
1249 if ((struct nf_conn *)cb->args[1] == last)
1257 if (nf_ct_should_gc(nf_ct_evict[i]))
1258 nf_ct_kill(nf_ct_evict[i]);
1259 nf_ct_put(nf_ct_evict[i]);
1265 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
1266 struct nf_conntrack_tuple *t,
1269 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1270 if (!tb[CTA_IP_V4_SRC])
1273 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1276 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1277 if (!tb[CTA_IP_V4_DST])
1280 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1286 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1287 struct nf_conntrack_tuple *t,
1290 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1291 if (!tb[CTA_IP_V6_SRC])
1294 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1297 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1298 if (!tb[CTA_IP_V6_DST])
1301 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1307 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1308 struct nf_conntrack_tuple *tuple,
1311 struct nlattr *tb[CTA_IP_MAX+1];
1314 ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
1318 ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
1319 cta_ip_nla_policy, NULL);
1323 switch (tuple->src.l3num) {
1325 ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
1328 ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
1335 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1336 [CTA_PROTO_NUM] = { .type = NLA_U8 },
1339 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1340 struct nf_conntrack_tuple *tuple,
1343 const struct nf_conntrack_l4proto *l4proto;
1344 struct nlattr *tb[CTA_PROTO_MAX+1];
1347 ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1348 proto_nla_policy, NULL);
1352 if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
1355 if (!tb[CTA_PROTO_NUM])
1358 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1361 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1363 if (likely(l4proto->nlattr_to_tuple)) {
1364 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1365 l4proto->nla_policy,
1368 ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
1377 ctnetlink_parse_zone(const struct nlattr *attr,
1378 struct nf_conntrack_zone *zone)
1380 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1381 NF_CT_DEFAULT_ZONE_DIR, 0);
1382 #ifdef CONFIG_NF_CONNTRACK_ZONES
1384 zone->id = ntohs(nla_get_be16(attr));
1393 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1394 struct nf_conntrack_zone *zone)
1398 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1401 ret = ctnetlink_parse_zone(attr, zone);
1405 if (type == CTA_TUPLE_REPLY)
1406 zone->dir = NF_CT_ZONE_DIR_REPL;
1408 zone->dir = NF_CT_ZONE_DIR_ORIG;
1413 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1414 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1415 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1416 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1419 #define CTA_FILTER_F_ALL_CTA_PROTO \
1420 (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
1421 CTA_FILTER_F_CTA_PROTO_DST_PORT | \
1422 CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
1423 CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
1424 CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
1425 CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
1426 CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
1427 CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
1430 ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
1431 struct nf_conntrack_tuple *tuple, u32 type,
1432 u_int8_t l3num, struct nf_conntrack_zone *zone,
1435 struct nlattr *tb[CTA_TUPLE_MAX+1];
1438 memset(tuple, 0, sizeof(*tuple));
1440 err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1441 tuple_nla_policy, NULL);
1445 if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1447 tuple->src.l3num = l3num;
1449 if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
1450 flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1451 if (!tb[CTA_TUPLE_IP])
1454 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
1459 if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
1460 if (!tb[CTA_TUPLE_PROTO])
1463 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
1466 } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
1467 /* Can't manage proto flags without a protonum */
1471 if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
1475 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1481 /* orig and expect tuples get DIR_ORIGINAL */
1482 if (type == CTA_TUPLE_REPLY)
1483 tuple->dst.dir = IP_CT_DIR_REPLY;
1485 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1491 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1492 struct nf_conntrack_tuple *tuple, u32 type,
1493 u_int8_t l3num, struct nf_conntrack_zone *zone)
1495 return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
1496 CTA_FILTER_FLAG(ALL));
1499 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1500 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1501 .len = NF_CT_HELPER_NAME_LEN - 1 },
1504 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1505 struct nlattr **helpinfo)
1508 struct nlattr *tb[CTA_HELP_MAX+1];
1510 err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1511 help_nla_policy, NULL);
1515 if (!tb[CTA_HELP_NAME])
1518 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1520 if (tb[CTA_HELP_INFO])
1521 *helpinfo = tb[CTA_HELP_INFO];
1526 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1527 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1528 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1529 [CTA_STATUS] = { .type = NLA_U32 },
1530 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1531 [CTA_HELP] = { .type = NLA_NESTED },
1532 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1533 [CTA_TIMEOUT] = { .type = NLA_U32 },
1534 [CTA_MARK] = { .type = NLA_U32 },
1535 [CTA_ID] = { .type = NLA_U32 },
1536 [CTA_NAT_DST] = { .type = NLA_NESTED },
1537 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1538 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1539 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1540 [CTA_ZONE] = { .type = NLA_U16 },
1541 [CTA_MARK_MASK] = { .type = NLA_U32 },
1542 [CTA_LABELS] = { .type = NLA_BINARY,
1543 .len = NF_CT_LABELS_MAX_SIZE },
1544 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1545 .len = NF_CT_LABELS_MAX_SIZE },
1546 [CTA_FILTER] = { .type = NLA_NESTED },
1547 [CTA_STATUS_MASK] = { .type = NLA_U32 },
1550 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1552 if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1555 return ctnetlink_filter_match(ct, data);
1558 static int ctnetlink_flush_conntrack(struct net *net,
1559 const struct nlattr * const cda[],
1560 u32 portid, int report, u8 family)
1562 struct ctnetlink_filter *filter = NULL;
1563 struct nf_ct_iter_data iter = {
1569 if (ctnetlink_needs_filter(family, cda)) {
1570 if (cda[CTA_FILTER])
1573 filter = ctnetlink_alloc_filter(cda, family);
1575 return PTR_ERR(filter);
1580 nf_ct_iterate_cleanup_net(ctnetlink_flush_iterate, &iter);
1586 static int ctnetlink_del_conntrack(struct sk_buff *skb,
1587 const struct nfnl_info *info,
1588 const struct nlattr * const cda[])
1590 u8 family = info->nfmsg->nfgen_family;
1591 struct nf_conntrack_tuple_hash *h;
1592 struct nf_conntrack_tuple tuple;
1593 struct nf_conntrack_zone zone;
1597 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1601 if (cda[CTA_TUPLE_ORIG])
1602 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1604 else if (cda[CTA_TUPLE_REPLY])
1605 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1608 u_int8_t u3 = info->nfmsg->version ? family : AF_UNSPEC;
1610 return ctnetlink_flush_conntrack(info->net, cda,
1611 NETLINK_CB(skb).portid,
1612 nlmsg_report(info->nlh), u3);
1618 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1622 ct = nf_ct_tuplehash_to_ctrack(h);
1624 if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1630 __be32 id = nla_get_be32(cda[CTA_ID]);
1632 if (id != (__force __be32)nf_ct_get_id(ct)) {
1638 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(info->nlh));
1644 static int ctnetlink_get_conntrack(struct sk_buff *skb,
1645 const struct nfnl_info *info,
1646 const struct nlattr * const cda[])
1648 u_int8_t u3 = info->nfmsg->nfgen_family;
1649 struct nf_conntrack_tuple_hash *h;
1650 struct nf_conntrack_tuple tuple;
1651 struct nf_conntrack_zone zone;
1652 struct sk_buff *skb2;
1656 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1657 struct netlink_dump_control c = {
1658 .start = ctnetlink_start,
1659 .dump = ctnetlink_dump_table,
1660 .done = ctnetlink_done,
1661 .data = (void *)cda,
1664 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1667 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1671 if (cda[CTA_TUPLE_ORIG])
1672 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1674 else if (cda[CTA_TUPLE_REPLY])
1675 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1683 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1687 ct = nf_ct_tuplehash_to_ctrack(h);
1689 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1695 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid,
1696 info->nlh->nlmsg_seq,
1697 NFNL_MSG_TYPE(info->nlh->nlmsg_type), ct,
1705 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
1708 static int ctnetlink_done_list(struct netlink_callback *cb)
1710 struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
1713 nf_ct_put(ctx->last);
1718 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1719 static int ctnetlink_dump_one_entry(struct sk_buff *skb,
1720 struct netlink_callback *cb,
1724 struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
1725 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1726 u8 l3proto = nfmsg->nfgen_family;
1729 if (l3proto && nf_ct_l3num(ct) != l3proto)
1733 if (ct != ctx->last)
1739 /* We can't dump extension info for the unconfirmed
1740 * list because unconfirmed conntracks can have
1741 * ct->ext reallocated (and thus freed).
1743 * In the dying list case ct->ext can't be free'd
1744 * until after we drop pcpu->lock.
1746 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1748 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1751 if (!refcount_inc_not_zero(&ct->ct_general.use))
1762 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1768 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1770 struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
1771 struct nf_conn *last = ctx->last;
1772 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1773 const struct net *net = sock_net(skb->sk);
1774 struct nf_conntrack_net_ecache *ecache_net;
1775 struct nf_conntrack_tuple_hash *h;
1776 struct hlist_nulls_node *n;
1784 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1785 ecache_net = nf_conn_pernet_ecache(net);
1786 spin_lock_bh(&ecache_net->dying_lock);
1788 hlist_nulls_for_each_entry(h, n, &ecache_net->dying_list, hnnode) {
1792 ct = nf_ct_tuplehash_to_ctrack(h);
1793 if (last && last != ct)
1796 res = ctnetlink_dump_one_entry(skb, cb, ct, true);
1798 spin_unlock_bh(&ecache_net->dying_lock);
1807 spin_unlock_bh(&ecache_net->dying_lock);
1815 static int ctnetlink_get_ct_dying(struct sk_buff *skb,
1816 const struct nfnl_info *info,
1817 const struct nlattr * const cda[])
1819 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1820 struct netlink_dump_control c = {
1821 .dump = ctnetlink_dump_dying,
1822 .done = ctnetlink_done_list,
1824 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1830 static int ctnetlink_get_ct_unconfirmed(struct sk_buff *skb,
1831 const struct nfnl_info *info,
1832 const struct nlattr * const cda[])
1834 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1835 struct netlink_dump_control c = {
1836 .dump = ctnetlink_dump_unconfirmed,
1837 .done = ctnetlink_done_list,
1839 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1845 #if IS_ENABLED(CONFIG_NF_NAT)
1847 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1848 enum nf_nat_manip_type manip,
1849 const struct nlattr *attr)
1852 const struct nf_nat_hook *nat_hook;
1855 nat_hook = rcu_dereference(nf_nat_hook);
1857 #ifdef CONFIG_MODULES
1859 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1860 if (request_module("nf-nat") < 0) {
1861 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1865 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1867 nat_hook = rcu_dereference(nf_nat_hook);
1874 err = nat_hook->parse_nat_setup(ct, manip, attr);
1875 if (err == -EAGAIN) {
1876 #ifdef CONFIG_MODULES
1878 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1879 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1880 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1884 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1895 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1897 return nf_ct_change_status_common(ct, ntohl(nla_get_be32(cda[CTA_STATUS])));
1901 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1903 #if IS_ENABLED(CONFIG_NF_NAT)
1906 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1909 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1914 return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1917 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1923 static int ctnetlink_change_helper(struct nf_conn *ct,
1924 const struct nlattr * const cda[])
1926 struct nf_conntrack_helper *helper;
1927 struct nf_conn_help *help = nfct_help(ct);
1928 char *helpname = NULL;
1929 struct nlattr *helpinfo = NULL;
1932 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1936 /* don't change helper of sibling connections */
1938 /* If we try to change the helper to the same thing twice,
1939 * treat the second attempt as a no-op instead of returning
1945 helper = rcu_dereference(help->helper);
1946 if (helper && !strcmp(helper->name, helpname))
1954 if (!strcmp(helpname, "")) {
1955 if (help && help->helper) {
1956 /* we had a helper before ... */
1957 nf_ct_remove_expectations(ct);
1958 RCU_INIT_POINTER(help->helper, NULL);
1965 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1966 nf_ct_protonum(ct));
1967 if (helper == NULL) {
1973 if (rcu_access_pointer(help->helper) == helper) {
1974 /* update private helper data if allowed. */
1975 if (helper->from_nlattr)
1976 helper->from_nlattr(helpinfo, ct);
1981 /* we cannot set a helper for an existing conntrack */
1989 static int ctnetlink_change_timeout(struct nf_conn *ct,
1990 const struct nlattr * const cda[])
1992 return __nf_ct_change_timeout(ct, (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ);
1995 #if defined(CONFIG_NF_CONNTRACK_MARK)
1996 static void ctnetlink_change_mark(struct nf_conn *ct,
1997 const struct nlattr * const cda[])
1999 u32 mark, newmark, mask = 0;
2001 if (cda[CTA_MARK_MASK])
2002 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2004 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2005 newmark = (ct->mark & mask) ^ mark;
2006 if (newmark != ct->mark)
2011 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
2012 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
2013 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
2014 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
2017 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
2018 const struct nlattr * const cda[])
2020 const struct nlattr *attr = cda[CTA_PROTOINFO];
2021 const struct nf_conntrack_l4proto *l4proto;
2022 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
2025 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
2026 protoinfo_policy, NULL);
2030 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
2031 if (l4proto->from_nlattr)
2032 err = l4proto->from_nlattr(tb, ct);
2037 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
2038 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
2039 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
2040 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
2043 static int change_seq_adj(struct nf_ct_seqadj *seq,
2044 const struct nlattr * const attr)
2047 struct nlattr *cda[CTA_SEQADJ_MAX+1];
2049 err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
2050 seqadj_policy, NULL);
2054 if (!cda[CTA_SEQADJ_CORRECTION_POS])
2057 seq->correction_pos =
2058 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
2060 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
2063 seq->offset_before =
2064 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
2066 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
2070 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
2076 ctnetlink_change_seq_adj(struct nf_conn *ct,
2077 const struct nlattr * const cda[])
2079 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
2085 spin_lock_bh(&ct->lock);
2086 if (cda[CTA_SEQ_ADJ_ORIG]) {
2087 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
2088 cda[CTA_SEQ_ADJ_ORIG]);
2092 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2095 if (cda[CTA_SEQ_ADJ_REPLY]) {
2096 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
2097 cda[CTA_SEQ_ADJ_REPLY]);
2101 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2104 spin_unlock_bh(&ct->lock);
2107 spin_unlock_bh(&ct->lock);
2111 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
2112 [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
2113 [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
2114 [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
2117 static int ctnetlink_change_synproxy(struct nf_conn *ct,
2118 const struct nlattr * const cda[])
2120 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
2121 struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
2127 err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
2128 cda[CTA_SYNPROXY], synproxy_policy,
2133 if (!tb[CTA_SYNPROXY_ISN] ||
2134 !tb[CTA_SYNPROXY_ITS] ||
2135 !tb[CTA_SYNPROXY_TSOFF])
2138 synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
2139 synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
2140 synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
2146 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
2148 #ifdef CONFIG_NF_CONNTRACK_LABELS
2149 size_t len = nla_len(cda[CTA_LABELS]);
2150 const void *mask = cda[CTA_LABELS_MASK];
2152 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
2156 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
2157 nla_len(cda[CTA_LABELS_MASK]) != len)
2159 mask = nla_data(cda[CTA_LABELS_MASK]);
2164 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
2171 ctnetlink_change_conntrack(struct nf_conn *ct,
2172 const struct nlattr * const cda[])
2176 /* only allow NAT changes and master assignation for new conntracks */
2177 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
2180 if (cda[CTA_HELP]) {
2181 err = ctnetlink_change_helper(ct, cda);
2186 if (cda[CTA_TIMEOUT]) {
2187 err = ctnetlink_change_timeout(ct, cda);
2192 if (cda[CTA_STATUS]) {
2193 err = ctnetlink_change_status(ct, cda);
2198 if (cda[CTA_PROTOINFO]) {
2199 err = ctnetlink_change_protoinfo(ct, cda);
2204 #if defined(CONFIG_NF_CONNTRACK_MARK)
2206 ctnetlink_change_mark(ct, cda);
2209 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2210 err = ctnetlink_change_seq_adj(ct, cda);
2215 if (cda[CTA_SYNPROXY]) {
2216 err = ctnetlink_change_synproxy(ct, cda);
2221 if (cda[CTA_LABELS]) {
2222 err = ctnetlink_attach_labels(ct, cda);
2230 static struct nf_conn *
2231 ctnetlink_create_conntrack(struct net *net,
2232 const struct nf_conntrack_zone *zone,
2233 const struct nlattr * const cda[],
2234 struct nf_conntrack_tuple *otuple,
2235 struct nf_conntrack_tuple *rtuple,
2240 struct nf_conntrack_helper *helper;
2241 struct nf_conn_tstamp *tstamp;
2244 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
2246 return ERR_PTR(-ENOMEM);
2248 if (!cda[CTA_TIMEOUT])
2251 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2252 __nf_ct_set_timeout(ct, timeout);
2255 if (cda[CTA_HELP]) {
2256 char *helpname = NULL;
2257 struct nlattr *helpinfo = NULL;
2259 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
2263 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2264 nf_ct_protonum(ct));
2265 if (helper == NULL) {
2267 #ifdef CONFIG_MODULES
2268 if (request_module("nfct-helper-%s", helpname) < 0) {
2274 helper = __nf_conntrack_helper_find(helpname,
2276 nf_ct_protonum(ct));
2286 struct nf_conn_help *help;
2288 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2293 /* set private helper data if allowed. */
2294 if (helper->from_nlattr)
2295 helper->from_nlattr(helpinfo, ct);
2297 /* disable helper auto-assignment for this entry */
2298 ct->status |= IPS_HELPER;
2299 RCU_INIT_POINTER(help->helper, helper);
2302 /* try an implicit helper assignation */
2303 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
2308 err = ctnetlink_setup_nat(ct, cda);
2312 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2313 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2314 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2315 nf_ct_labels_ext_add(ct);
2316 nfct_seqadj_ext_add(ct);
2317 nfct_synproxy_ext_add(ct);
2319 /* we must add conntrack extensions before confirmation. */
2320 ct->status |= IPS_CONFIRMED;
2322 if (cda[CTA_STATUS]) {
2323 err = ctnetlink_change_status(ct, cda);
2328 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2329 err = ctnetlink_change_seq_adj(ct, cda);
2334 memset(&ct->proto, 0, sizeof(ct->proto));
2335 if (cda[CTA_PROTOINFO]) {
2336 err = ctnetlink_change_protoinfo(ct, cda);
2341 if (cda[CTA_SYNPROXY]) {
2342 err = ctnetlink_change_synproxy(ct, cda);
2347 #if defined(CONFIG_NF_CONNTRACK_MARK)
2349 ctnetlink_change_mark(ct, cda);
2352 /* setup master conntrack: this is a confirmed expectation */
2353 if (cda[CTA_TUPLE_MASTER]) {
2354 struct nf_conntrack_tuple master;
2355 struct nf_conntrack_tuple_hash *master_h;
2356 struct nf_conn *master_ct;
2358 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2363 master_h = nf_conntrack_find_get(net, zone, &master);
2364 if (master_h == NULL) {
2368 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2369 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2370 ct->master = master_ct;
2372 tstamp = nf_conn_tstamp_find(ct);
2374 tstamp->start = ktime_get_real_ns();
2376 err = nf_conntrack_hash_check_insert(ct);
2387 nf_conntrack_free(ct);
2388 return ERR_PTR(err);
2391 static int ctnetlink_new_conntrack(struct sk_buff *skb,
2392 const struct nfnl_info *info,
2393 const struct nlattr * const cda[])
2395 struct nf_conntrack_tuple otuple, rtuple;
2396 struct nf_conntrack_tuple_hash *h = NULL;
2397 u_int8_t u3 = info->nfmsg->nfgen_family;
2398 struct nf_conntrack_zone zone;
2402 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2406 if (cda[CTA_TUPLE_ORIG]) {
2407 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2413 if (cda[CTA_TUPLE_REPLY]) {
2414 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2420 if (cda[CTA_TUPLE_ORIG])
2421 h = nf_conntrack_find_get(info->net, &zone, &otuple);
2422 else if (cda[CTA_TUPLE_REPLY])
2423 h = nf_conntrack_find_get(info->net, &zone, &rtuple);
2427 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
2428 enum ip_conntrack_events events;
2430 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2432 if (otuple.dst.protonum != rtuple.dst.protonum)
2435 ct = ctnetlink_create_conntrack(info->net, &zone, cda,
2436 &otuple, &rtuple, u3);
2441 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2442 events = 1 << IPCT_RELATED;
2444 events = 1 << IPCT_NEW;
2446 if (cda[CTA_LABELS] &&
2447 ctnetlink_attach_labels(ct, cda) == 0)
2448 events |= (1 << IPCT_LABEL);
2450 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2451 (1 << IPCT_ASSURED) |
2452 (1 << IPCT_HELPER) |
2453 (1 << IPCT_PROTOINFO) |
2454 (1 << IPCT_SEQADJ) |
2456 (1 << IPCT_SYNPROXY) |
2458 ct, NETLINK_CB(skb).portid,
2459 nlmsg_report(info->nlh));
2465 /* implicit 'else' */
2468 ct = nf_ct_tuplehash_to_ctrack(h);
2469 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL)) {
2470 err = ctnetlink_change_conntrack(ct, cda);
2472 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2473 (1 << IPCT_ASSURED) |
2474 (1 << IPCT_HELPER) |
2476 (1 << IPCT_PROTOINFO) |
2477 (1 << IPCT_SEQADJ) |
2479 (1 << IPCT_SYNPROXY),
2480 ct, NETLINK_CB(skb).portid,
2481 nlmsg_report(info->nlh));
2490 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2491 __u16 cpu, const struct ip_conntrack_stat *st)
2493 struct nlmsghdr *nlh;
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 = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2499 NFNETLINK_V0, htons(cpu));
2503 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2504 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2505 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2506 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2507 htonl(st->insert_failed)) ||
2508 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2509 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2510 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2511 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2512 htonl(st->search_restart)) ||
2513 nla_put_be32(skb, CTA_STATS_CLASH_RESOLVE,
2514 htonl(st->clash_resolve)) ||
2515 nla_put_be32(skb, CTA_STATS_CHAIN_TOOLONG,
2516 htonl(st->chaintoolong)))
2517 goto nla_put_failure;
2519 nlmsg_end(skb, nlh);
2524 nlmsg_cancel(skb, nlh);
2529 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2532 struct net *net = sock_net(skb->sk);
2534 if (cb->args[0] == nr_cpu_ids)
2537 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2538 const struct ip_conntrack_stat *st;
2540 if (!cpu_possible(cpu))
2543 st = per_cpu_ptr(net->ct.stat, cpu);
2544 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2545 NETLINK_CB(cb->skb).portid,
2555 static int ctnetlink_stat_ct_cpu(struct sk_buff *skb,
2556 const struct nfnl_info *info,
2557 const struct nlattr * const cda[])
2559 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
2560 struct netlink_dump_control c = {
2561 .dump = ctnetlink_ct_stat_cpu_dump,
2563 return netlink_dump_start(info->sk, skb, info->nlh, &c);
2570 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2573 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2574 unsigned int nr_conntracks;
2575 struct nlmsghdr *nlh;
2577 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2578 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2583 nr_conntracks = nf_conntrack_count(net);
2584 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2585 goto nla_put_failure;
2587 if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2588 goto nla_put_failure;
2590 nlmsg_end(skb, nlh);
2595 nlmsg_cancel(skb, nlh);
2599 static int ctnetlink_stat_ct(struct sk_buff *skb, const struct nfnl_info *info,
2600 const struct nlattr * const cda[])
2602 struct sk_buff *skb2;
2605 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2609 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2610 info->nlh->nlmsg_seq,
2611 NFNL_MSG_TYPE(info->nlh->nlmsg_type),
2618 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
2621 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2622 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2623 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2624 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2625 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2626 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2627 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2628 .len = NF_CT_HELPER_NAME_LEN - 1 },
2629 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2630 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2631 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2632 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2633 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2636 static struct nf_conntrack_expect *
2637 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2638 struct nf_conntrack_helper *helper,
2639 struct nf_conntrack_tuple *tuple,
2640 struct nf_conntrack_tuple *mask);
2642 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2644 ctnetlink_glue_build_size(const struct nf_conn *ct)
2646 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2647 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2648 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2649 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2650 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2651 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2652 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2653 + nla_total_size(0) /* CTA_PROTOINFO */
2654 + nla_total_size(0) /* CTA_HELP */
2655 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2656 + ctnetlink_secctx_size(ct)
2657 + ctnetlink_acct_size(ct)
2658 + ctnetlink_timestamp_size(ct)
2659 #if IS_ENABLED(CONFIG_NF_NAT)
2660 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2661 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2663 #ifdef CONFIG_NF_CONNTRACK_MARK
2664 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2666 #ifdef CONFIG_NF_CONNTRACK_ZONES
2667 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2669 + ctnetlink_proto_size(ct)
2673 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2675 const struct nf_conntrack_zone *zone;
2676 struct nlattr *nest_parms;
2678 zone = nf_ct_zone(ct);
2680 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2682 goto nla_put_failure;
2683 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2684 goto nla_put_failure;
2685 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2686 NF_CT_ZONE_DIR_ORIG) < 0)
2687 goto nla_put_failure;
2688 nla_nest_end(skb, nest_parms);
2690 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2692 goto nla_put_failure;
2693 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2694 goto nla_put_failure;
2695 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2696 NF_CT_ZONE_DIR_REPL) < 0)
2697 goto nla_put_failure;
2698 nla_nest_end(skb, nest_parms);
2700 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2701 NF_CT_DEFAULT_ZONE_DIR) < 0)
2702 goto nla_put_failure;
2704 if (ctnetlink_dump_id(skb, ct) < 0)
2705 goto nla_put_failure;
2707 if (ctnetlink_dump_status(skb, ct) < 0)
2708 goto nla_put_failure;
2710 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
2711 goto nla_put_failure;
2713 if (ctnetlink_dump_protoinfo(skb, ct, false) < 0)
2714 goto nla_put_failure;
2716 if (ctnetlink_dump_acct(skb, ct, IPCTNL_MSG_CT_GET) < 0 ||
2717 ctnetlink_dump_timestamp(skb, ct) < 0)
2718 goto nla_put_failure;
2720 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2721 goto nla_put_failure;
2723 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2724 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2725 goto nla_put_failure;
2727 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2728 goto nla_put_failure;
2730 if ((ct->status & IPS_SEQ_ADJUST) &&
2731 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2732 goto nla_put_failure;
2734 if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2735 goto nla_put_failure;
2737 #ifdef CONFIG_NF_CONNTRACK_MARK
2738 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2739 goto nla_put_failure;
2741 if (ctnetlink_dump_labels(skb, ct) < 0)
2742 goto nla_put_failure;
2750 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2751 enum ip_conntrack_info ctinfo,
2752 u_int16_t ct_attr, u_int16_t ct_info_attr)
2754 struct nlattr *nest_parms;
2756 nest_parms = nla_nest_start(skb, ct_attr);
2758 goto nla_put_failure;
2760 if (__ctnetlink_glue_build(skb, ct) < 0)
2761 goto nla_put_failure;
2763 nla_nest_end(skb, nest_parms);
2765 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2766 goto nla_put_failure;
2775 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2777 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2778 unsigned long d = ct->status ^ status;
2780 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2781 /* SEEN_REPLY bit can only be set */
2784 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2785 /* ASSURED bit can only be set */
2788 /* This check is less strict than ctnetlink_change_status()
2789 * because callers often flip IPS_EXPECTED bits when sending
2790 * an NFQA_CT attribute to the kernel. So ignore the
2791 * unchangeable bits but do not error out. Also user programs
2792 * are allowed to clear the bits that they are allowed to change.
2794 __nf_ct_change_status(ct, status, ~status);
2799 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2803 if (cda[CTA_TIMEOUT]) {
2804 err = ctnetlink_change_timeout(ct, cda);
2808 if (cda[CTA_STATUS]) {
2809 err = ctnetlink_update_status(ct, cda);
2813 if (cda[CTA_HELP]) {
2814 err = ctnetlink_change_helper(ct, cda);
2818 if (cda[CTA_LABELS]) {
2819 err = ctnetlink_attach_labels(ct, cda);
2823 #if defined(CONFIG_NF_CONNTRACK_MARK)
2824 if (cda[CTA_MARK]) {
2825 ctnetlink_change_mark(ct, cda);
2832 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2834 struct nlattr *cda[CTA_MAX+1];
2837 ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2842 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2845 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2846 const struct nf_conn *ct,
2847 struct nf_conntrack_tuple *tuple,
2848 struct nf_conntrack_tuple *mask)
2852 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2853 nf_ct_l3num(ct), NULL);
2857 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2858 nf_ct_l3num(ct), NULL);
2862 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2863 u32 portid, u32 report)
2865 struct nlattr *cda[CTA_EXPECT_MAX+1];
2866 struct nf_conntrack_tuple tuple, mask;
2867 struct nf_conntrack_helper *helper = NULL;
2868 struct nf_conntrack_expect *exp;
2871 err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2872 exp_nla_policy, NULL);
2876 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2881 if (cda[CTA_EXPECT_HELP_NAME]) {
2882 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2884 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2885 nf_ct_protonum(ct));
2890 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2891 helper, &tuple, &mask);
2893 return PTR_ERR(exp);
2895 err = nf_ct_expect_related_report(exp, portid, report, 0);
2896 nf_ct_expect_put(exp);
2900 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2901 enum ip_conntrack_info ctinfo, int diff)
2903 if (!(ct->status & IPS_NAT_MASK))
2906 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2909 static const struct nfnl_ct_hook ctnetlink_glue_hook = {
2910 .build_size = ctnetlink_glue_build_size,
2911 .build = ctnetlink_glue_build,
2912 .parse = ctnetlink_glue_parse,
2913 .attach_expect = ctnetlink_glue_attach_expect,
2914 .seq_adjust = ctnetlink_glue_seqadj,
2916 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2918 /***********************************************************************
2920 ***********************************************************************/
2922 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2923 const struct nf_conntrack_tuple *tuple,
2926 struct nlattr *nest_parms;
2928 nest_parms = nla_nest_start(skb, type);
2930 goto nla_put_failure;
2931 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2932 goto nla_put_failure;
2933 nla_nest_end(skb, nest_parms);
2941 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2942 const struct nf_conntrack_tuple *tuple,
2943 const struct nf_conntrack_tuple_mask *mask)
2945 const struct nf_conntrack_l4proto *l4proto;
2946 struct nf_conntrack_tuple m;
2947 struct nlattr *nest_parms;
2950 memset(&m, 0xFF, sizeof(m));
2951 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2952 m.src.u.all = mask->src.u.all;
2953 m.src.l3num = tuple->src.l3num;
2954 m.dst.protonum = tuple->dst.protonum;
2956 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2958 goto nla_put_failure;
2961 ret = ctnetlink_dump_tuples_ip(skb, &m);
2963 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2964 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2968 if (unlikely(ret < 0))
2969 goto nla_put_failure;
2971 nla_nest_end(skb, nest_parms);
2979 static const union nf_inet_addr any_addr;
2981 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2983 static siphash_aligned_key_t exp_id_seed;
2984 unsigned long a, b, c, d;
2986 net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
2988 a = (unsigned long)exp;
2989 b = (unsigned long)exp->helper;
2990 c = (unsigned long)exp->master;
2991 d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
2994 return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
2996 return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
3001 ctnetlink_exp_dump_expect(struct sk_buff *skb,
3002 const struct nf_conntrack_expect *exp)
3004 struct nf_conn *master = exp->master;
3005 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
3006 struct nf_conn_help *help;
3007 #if IS_ENABLED(CONFIG_NF_NAT)
3008 struct nlattr *nest_parms;
3009 struct nf_conntrack_tuple nat_tuple = {};
3011 struct nf_ct_helper_expectfn *expfn;
3016 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
3017 goto nla_put_failure;
3018 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
3019 goto nla_put_failure;
3020 if (ctnetlink_exp_dump_tuple(skb,
3021 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
3022 CTA_EXPECT_MASTER) < 0)
3023 goto nla_put_failure;
3025 #if IS_ENABLED(CONFIG_NF_NAT)
3026 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
3027 exp->saved_proto.all) {
3028 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
3030 goto nla_put_failure;
3032 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
3033 goto nla_put_failure;
3035 nat_tuple.src.l3num = nf_ct_l3num(master);
3036 nat_tuple.src.u3 = exp->saved_addr;
3037 nat_tuple.dst.protonum = nf_ct_protonum(master);
3038 nat_tuple.src.u = exp->saved_proto;
3040 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
3041 CTA_EXPECT_NAT_TUPLE) < 0)
3042 goto nla_put_failure;
3043 nla_nest_end(skb, nest_parms);
3046 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
3047 nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
3048 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
3049 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
3050 goto nla_put_failure;
3051 help = nfct_help(master);
3053 struct nf_conntrack_helper *helper;
3055 helper = rcu_dereference(help->helper);
3057 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
3058 goto nla_put_failure;
3060 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
3061 if (expfn != NULL &&
3062 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
3063 goto nla_put_failure;
3072 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
3073 int event, const struct nf_conntrack_expect *exp)
3075 struct nlmsghdr *nlh;
3076 unsigned int flags = portid ? NLM_F_MULTI : 0;
3078 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
3079 nlh = nfnl_msg_put(skb, portid, seq, event, flags,
3080 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3084 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3085 goto nla_put_failure;
3087 nlmsg_end(skb, nlh);
3092 nlmsg_cancel(skb, nlh);
3096 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3098 ctnetlink_expect_event(unsigned int events, const struct nf_exp_event *item)
3100 struct nf_conntrack_expect *exp = item->exp;
3101 struct net *net = nf_ct_exp_net(exp);
3102 struct nlmsghdr *nlh;
3103 struct sk_buff *skb;
3104 unsigned int type, group;
3107 if (events & (1 << IPEXP_DESTROY)) {
3108 type = IPCTNL_MSG_EXP_DELETE;
3109 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
3110 } else if (events & (1 << IPEXP_NEW)) {
3111 type = IPCTNL_MSG_EXP_NEW;
3112 flags = NLM_F_CREATE|NLM_F_EXCL;
3113 group = NFNLGRP_CONNTRACK_EXP_NEW;
3117 if (!item->report && !nfnetlink_has_listeners(net, group))
3120 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
3124 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
3125 nlh = nfnl_msg_put(skb, item->portid, 0, type, flags,
3126 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3130 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3131 goto nla_put_failure;
3133 nlmsg_end(skb, nlh);
3134 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
3138 nlmsg_cancel(skb, nlh);
3142 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
3146 static int ctnetlink_exp_done(struct netlink_callback *cb)
3149 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
3154 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3156 struct net *net = sock_net(skb->sk);
3157 struct nf_conntrack_expect *exp, *last;
3158 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3159 u_int8_t l3proto = nfmsg->nfgen_family;
3162 last = (struct nf_conntrack_expect *)cb->args[1];
3163 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
3165 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
3167 if (l3proto && exp->tuple.src.l3num != l3proto)
3170 if (!net_eq(nf_ct_net(exp->master), net))
3178 if (ctnetlink_exp_fill_info(skb,
3179 NETLINK_CB(cb->skb).portid,
3183 if (!refcount_inc_not_zero(&exp->use))
3185 cb->args[1] = (unsigned long)exp;
3197 nf_ct_expect_put(last);
3203 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3205 struct nf_conntrack_expect *exp, *last;
3206 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3207 struct nf_conn *ct = cb->data;
3208 struct nf_conn_help *help = nfct_help(ct);
3209 u_int8_t l3proto = nfmsg->nfgen_family;
3215 last = (struct nf_conntrack_expect *)cb->args[1];
3217 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
3218 if (l3proto && exp->tuple.src.l3num != l3proto)
3225 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
3229 if (!refcount_inc_not_zero(&exp->use))
3231 cb->args[1] = (unsigned long)exp;
3243 nf_ct_expect_put(last);
3248 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
3249 struct sk_buff *skb,
3250 const struct nlmsghdr *nlh,
3251 const struct nlattr * const cda[],
3252 struct netlink_ext_ack *extack)
3255 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3256 u_int8_t u3 = nfmsg->nfgen_family;
3257 struct nf_conntrack_tuple tuple;
3258 struct nf_conntrack_tuple_hash *h;
3260 struct nf_conntrack_zone zone;
3261 struct netlink_dump_control c = {
3262 .dump = ctnetlink_exp_ct_dump_table,
3263 .done = ctnetlink_exp_done,
3266 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3271 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3275 h = nf_conntrack_find_get(net, &zone, &tuple);
3279 ct = nf_ct_tuplehash_to_ctrack(h);
3280 /* No expectation linked to this connection tracking. */
3281 if (!nfct_help(ct)) {
3288 err = netlink_dump_start(ctnl, skb, nlh, &c);
3294 static int ctnetlink_get_expect(struct sk_buff *skb,
3295 const struct nfnl_info *info,
3296 const struct nlattr * const cda[])
3298 u_int8_t u3 = info->nfmsg->nfgen_family;
3299 struct nf_conntrack_tuple tuple;
3300 struct nf_conntrack_expect *exp;
3301 struct nf_conntrack_zone zone;
3302 struct sk_buff *skb2;
3305 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3306 if (cda[CTA_EXPECT_MASTER])
3307 return ctnetlink_dump_exp_ct(info->net, info->sk, skb,
3311 struct netlink_dump_control c = {
3312 .dump = ctnetlink_exp_dump_table,
3313 .done = ctnetlink_exp_done,
3315 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3319 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3323 if (cda[CTA_EXPECT_TUPLE])
3324 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3326 else if (cda[CTA_EXPECT_MASTER])
3327 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3335 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3339 if (cda[CTA_EXPECT_ID]) {
3340 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3342 if (id != nf_expect_get_id(exp)) {
3343 nf_ct_expect_put(exp);
3348 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3350 nf_ct_expect_put(exp);
3355 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3356 info->nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
3359 nf_ct_expect_put(exp);
3365 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
3368 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3370 struct nf_conntrack_helper *helper;
3371 const struct nf_conn_help *m_help;
3372 const char *name = data;
3374 m_help = nfct_help(exp->master);
3376 helper = rcu_dereference(m_help->helper);
3380 return strcmp(helper->name, name) == 0;
3383 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3388 static int ctnetlink_del_expect(struct sk_buff *skb,
3389 const struct nfnl_info *info,
3390 const struct nlattr * const cda[])
3392 u_int8_t u3 = info->nfmsg->nfgen_family;
3393 struct nf_conntrack_expect *exp;
3394 struct nf_conntrack_tuple tuple;
3395 struct nf_conntrack_zone zone;
3398 if (cda[CTA_EXPECT_TUPLE]) {
3399 /* delete a single expect by tuple */
3400 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3404 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3409 /* bump usage count to 2 */
3410 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3414 if (cda[CTA_EXPECT_ID]) {
3415 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3416 if (ntohl(id) != (u32)(unsigned long)exp) {
3417 nf_ct_expect_put(exp);
3422 /* after list removal, usage count == 1 */
3423 spin_lock_bh(&nf_conntrack_expect_lock);
3424 if (del_timer(&exp->timeout)) {
3425 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3426 nlmsg_report(info->nlh));
3427 nf_ct_expect_put(exp);
3429 spin_unlock_bh(&nf_conntrack_expect_lock);
3430 /* have to put what we 'get' above.
3431 * after this line usage count == 0 */
3432 nf_ct_expect_put(exp);
3433 } else if (cda[CTA_EXPECT_HELP_NAME]) {
3434 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3436 nf_ct_expect_iterate_net(info->net, expect_iter_name, name,
3437 NETLINK_CB(skb).portid,
3438 nlmsg_report(info->nlh));
3440 /* This basically means we have to flush everything*/
3441 nf_ct_expect_iterate_net(info->net, expect_iter_all, NULL,
3442 NETLINK_CB(skb).portid,
3443 nlmsg_report(info->nlh));
3449 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3450 const struct nlattr * const cda[])
3452 if (cda[CTA_EXPECT_TIMEOUT]) {
3453 if (!del_timer(&x->timeout))
3456 x->timeout.expires = jiffies +
3457 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3458 add_timer(&x->timeout);
3463 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3464 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3465 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3469 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3470 struct nf_conntrack_expect *exp,
3473 #if IS_ENABLED(CONFIG_NF_NAT)
3474 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3475 struct nf_conntrack_tuple nat_tuple = {};
3478 err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3479 exp_nat_nla_policy, NULL);
3483 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3486 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3487 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3492 exp->saved_addr = nat_tuple.src.u3;
3493 exp->saved_proto = nat_tuple.src.u;
3494 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3502 static struct nf_conntrack_expect *
3503 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3504 struct nf_conntrack_helper *helper,
3505 struct nf_conntrack_tuple *tuple,
3506 struct nf_conntrack_tuple *mask)
3508 u_int32_t class = 0;
3509 struct nf_conntrack_expect *exp;
3510 struct nf_conn_help *help;
3513 help = nfct_help(ct);
3515 return ERR_PTR(-EOPNOTSUPP);
3517 if (cda[CTA_EXPECT_CLASS] && helper) {
3518 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3519 if (class > helper->expect_class_max)
3520 return ERR_PTR(-EINVAL);
3522 exp = nf_ct_expect_alloc(ct);
3524 return ERR_PTR(-ENOMEM);
3526 if (cda[CTA_EXPECT_FLAGS]) {
3527 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3528 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3532 if (cda[CTA_EXPECT_FN]) {
3533 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3534 struct nf_ct_helper_expectfn *expfn;
3536 expfn = nf_ct_helper_expectfn_find_by_name(name);
3537 if (expfn == NULL) {
3541 exp->expectfn = expfn->expectfn;
3543 exp->expectfn = NULL;
3547 exp->helper = helper;
3548 exp->tuple = *tuple;
3549 exp->mask.src.u3 = mask->src.u3;
3550 exp->mask.src.u.all = mask->src.u.all;
3552 if (cda[CTA_EXPECT_NAT]) {
3553 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3554 exp, nf_ct_l3num(ct));
3560 nf_ct_expect_put(exp);
3561 return ERR_PTR(err);
3565 ctnetlink_create_expect(struct net *net,
3566 const struct nf_conntrack_zone *zone,
3567 const struct nlattr * const cda[],
3568 u_int8_t u3, u32 portid, int report)
3570 struct nf_conntrack_tuple tuple, mask, master_tuple;
3571 struct nf_conntrack_tuple_hash *h = NULL;
3572 struct nf_conntrack_helper *helper = NULL;
3573 struct nf_conntrack_expect *exp;
3577 /* caller guarantees that those three CTA_EXPECT_* exist */
3578 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3582 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3586 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3591 /* Look for master conntrack of this expectation */
3592 h = nf_conntrack_find_get(net, zone, &master_tuple);
3595 ct = nf_ct_tuplehash_to_ctrack(h);
3598 if (cda[CTA_EXPECT_HELP_NAME]) {
3599 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3601 helper = __nf_conntrack_helper_find(helpname, u3,
3602 nf_ct_protonum(ct));
3603 if (helper == NULL) {
3605 #ifdef CONFIG_MODULES
3606 if (request_module("nfct-helper-%s", helpname) < 0) {
3611 helper = __nf_conntrack_helper_find(helpname, u3,
3612 nf_ct_protonum(ct));
3624 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3630 err = nf_ct_expect_related_report(exp, portid, report, 0);
3631 nf_ct_expect_put(exp);
3639 static int ctnetlink_new_expect(struct sk_buff *skb,
3640 const struct nfnl_info *info,
3641 const struct nlattr * const cda[])
3643 u_int8_t u3 = info->nfmsg->nfgen_family;
3644 struct nf_conntrack_tuple tuple;
3645 struct nf_conntrack_expect *exp;
3646 struct nf_conntrack_zone zone;
3649 if (!cda[CTA_EXPECT_TUPLE]
3650 || !cda[CTA_EXPECT_MASK]
3651 || !cda[CTA_EXPECT_MASTER])
3654 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3658 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3663 spin_lock_bh(&nf_conntrack_expect_lock);
3664 exp = __nf_ct_expect_find(info->net, &zone, &tuple);
3666 spin_unlock_bh(&nf_conntrack_expect_lock);
3668 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
3669 err = ctnetlink_create_expect(info->net, &zone, cda, u3,
3670 NETLINK_CB(skb).portid,
3671 nlmsg_report(info->nlh));
3677 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL))
3678 err = ctnetlink_change_expect(exp, cda);
3679 spin_unlock_bh(&nf_conntrack_expect_lock);
3685 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3686 const struct ip_conntrack_stat *st)
3688 struct nlmsghdr *nlh;
3689 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3691 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3692 IPCTNL_MSG_EXP_GET_STATS_CPU);
3693 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
3694 NFNETLINK_V0, htons(cpu));
3698 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3699 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3700 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3701 goto nla_put_failure;
3703 nlmsg_end(skb, nlh);
3708 nlmsg_cancel(skb, nlh);
3713 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3716 struct net *net = sock_net(skb->sk);
3718 if (cb->args[0] == nr_cpu_ids)
3721 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3722 const struct ip_conntrack_stat *st;
3724 if (!cpu_possible(cpu))
3727 st = per_cpu_ptr(net->ct.stat, cpu);
3728 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3738 static int ctnetlink_stat_exp_cpu(struct sk_buff *skb,
3739 const struct nfnl_info *info,
3740 const struct nlattr * const cda[])
3742 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3743 struct netlink_dump_control c = {
3744 .dump = ctnetlink_exp_stat_cpu_dump,
3746 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3752 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3753 static struct nf_ct_event_notifier ctnl_notifier = {
3754 .ct_event = ctnetlink_conntrack_event,
3755 .exp_event = ctnetlink_expect_event,
3759 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3760 [IPCTNL_MSG_CT_NEW] = {
3761 .call = ctnetlink_new_conntrack,
3762 .type = NFNL_CB_MUTEX,
3763 .attr_count = CTA_MAX,
3764 .policy = ct_nla_policy
3766 [IPCTNL_MSG_CT_GET] = {
3767 .call = ctnetlink_get_conntrack,
3768 .type = NFNL_CB_MUTEX,
3769 .attr_count = CTA_MAX,
3770 .policy = ct_nla_policy
3772 [IPCTNL_MSG_CT_DELETE] = {
3773 .call = ctnetlink_del_conntrack,
3774 .type = NFNL_CB_MUTEX,
3775 .attr_count = CTA_MAX,
3776 .policy = ct_nla_policy
3778 [IPCTNL_MSG_CT_GET_CTRZERO] = {
3779 .call = ctnetlink_get_conntrack,
3780 .type = NFNL_CB_MUTEX,
3781 .attr_count = CTA_MAX,
3782 .policy = ct_nla_policy
3784 [IPCTNL_MSG_CT_GET_STATS_CPU] = {
3785 .call = ctnetlink_stat_ct_cpu,
3786 .type = NFNL_CB_MUTEX,
3788 [IPCTNL_MSG_CT_GET_STATS] = {
3789 .call = ctnetlink_stat_ct,
3790 .type = NFNL_CB_MUTEX,
3792 [IPCTNL_MSG_CT_GET_DYING] = {
3793 .call = ctnetlink_get_ct_dying,
3794 .type = NFNL_CB_MUTEX,
3796 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = {
3797 .call = ctnetlink_get_ct_unconfirmed,
3798 .type = NFNL_CB_MUTEX,
3802 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3803 [IPCTNL_MSG_EXP_GET] = {
3804 .call = ctnetlink_get_expect,
3805 .type = NFNL_CB_MUTEX,
3806 .attr_count = CTA_EXPECT_MAX,
3807 .policy = exp_nla_policy
3809 [IPCTNL_MSG_EXP_NEW] = {
3810 .call = ctnetlink_new_expect,
3811 .type = NFNL_CB_MUTEX,
3812 .attr_count = CTA_EXPECT_MAX,
3813 .policy = exp_nla_policy
3815 [IPCTNL_MSG_EXP_DELETE] = {
3816 .call = ctnetlink_del_expect,
3817 .type = NFNL_CB_MUTEX,
3818 .attr_count = CTA_EXPECT_MAX,
3819 .policy = exp_nla_policy
3821 [IPCTNL_MSG_EXP_GET_STATS_CPU] = {
3822 .call = ctnetlink_stat_exp_cpu,
3823 .type = NFNL_CB_MUTEX,
3827 static const struct nfnetlink_subsystem ctnl_subsys = {
3828 .name = "conntrack",
3829 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3830 .cb_count = IPCTNL_MSG_MAX,
3834 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3835 .name = "conntrack_expect",
3836 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3837 .cb_count = IPCTNL_MSG_EXP_MAX,
3841 MODULE_ALIAS("ip_conntrack_netlink");
3842 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3843 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3845 static int __net_init ctnetlink_net_init(struct net *net)
3847 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3848 nf_conntrack_register_notifier(net, &ctnl_notifier);
3853 static void ctnetlink_net_pre_exit(struct net *net)
3855 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3856 nf_conntrack_unregister_notifier(net);
3860 static struct pernet_operations ctnetlink_net_ops = {
3861 .init = ctnetlink_net_init,
3862 .pre_exit = ctnetlink_net_pre_exit,
3865 static int __init ctnetlink_init(void)
3869 BUILD_BUG_ON(sizeof(struct ctnetlink_list_dump_ctx) > sizeof_field(struct netlink_callback, ctx));
3871 ret = nfnetlink_subsys_register(&ctnl_subsys);
3873 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3877 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3879 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3880 goto err_unreg_subsys;
3883 ret = register_pernet_subsys(&ctnetlink_net_ops);
3885 pr_err("ctnetlink_init: cannot register pernet operations\n");
3886 goto err_unreg_exp_subsys;
3888 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3889 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3890 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3894 err_unreg_exp_subsys:
3895 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3897 nfnetlink_subsys_unregister(&ctnl_subsys);
3902 static void __exit ctnetlink_exit(void)
3904 unregister_pernet_subsys(&ctnetlink_net_ops);
3905 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3906 nfnetlink_subsys_unregister(&ctnl_subsys);
3907 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3908 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3913 module_init(ctnetlink_init);
3914 module_exit(ctnetlink_exit);