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 if (i < ARRAY_SIZE(nf_ct_evict) &&
1207 refcount_inc_not_zero(&ct->ct_general.use))
1208 nf_ct_evict[i++] = ct;
1212 if (!net_eq(net, nf_ct_net(ct)))
1215 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
1223 if (!ctnetlink_filter_match(ct, cb->data))
1227 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1229 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1232 nf_conntrack_get(&ct->ct_general);
1233 cb->args[1] = (unsigned long)ct;
1247 /* nf ct hash resize happened, now clear the leftover. */
1248 if ((struct nf_conn *)cb->args[1] == last)
1256 if (nf_ct_should_gc(nf_ct_evict[i]))
1257 nf_ct_kill(nf_ct_evict[i]);
1258 nf_ct_put(nf_ct_evict[i]);
1264 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
1265 struct nf_conntrack_tuple *t,
1268 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1269 if (!tb[CTA_IP_V4_SRC])
1272 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1275 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1276 if (!tb[CTA_IP_V4_DST])
1279 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1285 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1286 struct nf_conntrack_tuple *t,
1289 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1290 if (!tb[CTA_IP_V6_SRC])
1293 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1296 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1297 if (!tb[CTA_IP_V6_DST])
1300 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1306 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1307 struct nf_conntrack_tuple *tuple,
1310 struct nlattr *tb[CTA_IP_MAX+1];
1313 ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
1317 ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
1318 cta_ip_nla_policy, NULL);
1322 switch (tuple->src.l3num) {
1324 ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
1327 ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
1334 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1335 [CTA_PROTO_NUM] = { .type = NLA_U8 },
1338 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1339 struct nf_conntrack_tuple *tuple,
1342 const struct nf_conntrack_l4proto *l4proto;
1343 struct nlattr *tb[CTA_PROTO_MAX+1];
1346 ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1347 proto_nla_policy, NULL);
1351 if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
1354 if (!tb[CTA_PROTO_NUM])
1357 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1360 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1362 if (likely(l4proto->nlattr_to_tuple)) {
1363 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1364 l4proto->nla_policy,
1367 ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
1376 ctnetlink_parse_zone(const struct nlattr *attr,
1377 struct nf_conntrack_zone *zone)
1379 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1380 NF_CT_DEFAULT_ZONE_DIR, 0);
1381 #ifdef CONFIG_NF_CONNTRACK_ZONES
1383 zone->id = ntohs(nla_get_be16(attr));
1392 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1393 struct nf_conntrack_zone *zone)
1397 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1400 ret = ctnetlink_parse_zone(attr, zone);
1404 if (type == CTA_TUPLE_REPLY)
1405 zone->dir = NF_CT_ZONE_DIR_REPL;
1407 zone->dir = NF_CT_ZONE_DIR_ORIG;
1412 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1413 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1414 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1415 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1418 #define CTA_FILTER_F_ALL_CTA_PROTO \
1419 (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
1420 CTA_FILTER_F_CTA_PROTO_DST_PORT | \
1421 CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
1422 CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
1423 CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
1424 CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
1425 CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
1426 CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
1429 ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
1430 struct nf_conntrack_tuple *tuple, u32 type,
1431 u_int8_t l3num, struct nf_conntrack_zone *zone,
1434 struct nlattr *tb[CTA_TUPLE_MAX+1];
1437 memset(tuple, 0, sizeof(*tuple));
1439 err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1440 tuple_nla_policy, NULL);
1444 if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1446 tuple->src.l3num = l3num;
1448 if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
1449 flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1450 if (!tb[CTA_TUPLE_IP])
1453 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
1458 if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
1459 if (!tb[CTA_TUPLE_PROTO])
1462 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
1465 } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
1466 /* Can't manage proto flags without a protonum */
1470 if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
1474 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1480 /* orig and expect tuples get DIR_ORIGINAL */
1481 if (type == CTA_TUPLE_REPLY)
1482 tuple->dst.dir = IP_CT_DIR_REPLY;
1484 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1490 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1491 struct nf_conntrack_tuple *tuple, u32 type,
1492 u_int8_t l3num, struct nf_conntrack_zone *zone)
1494 return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
1495 CTA_FILTER_FLAG(ALL));
1498 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1499 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1500 .len = NF_CT_HELPER_NAME_LEN - 1 },
1503 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1504 struct nlattr **helpinfo)
1507 struct nlattr *tb[CTA_HELP_MAX+1];
1509 err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1510 help_nla_policy, NULL);
1514 if (!tb[CTA_HELP_NAME])
1517 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1519 if (tb[CTA_HELP_INFO])
1520 *helpinfo = tb[CTA_HELP_INFO];
1525 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1526 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1527 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1528 [CTA_STATUS] = { .type = NLA_U32 },
1529 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1530 [CTA_HELP] = { .type = NLA_NESTED },
1531 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1532 [CTA_TIMEOUT] = { .type = NLA_U32 },
1533 [CTA_MARK] = { .type = NLA_U32 },
1534 [CTA_ID] = { .type = NLA_U32 },
1535 [CTA_NAT_DST] = { .type = NLA_NESTED },
1536 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1537 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1538 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1539 [CTA_ZONE] = { .type = NLA_U16 },
1540 [CTA_MARK_MASK] = { .type = NLA_U32 },
1541 [CTA_LABELS] = { .type = NLA_BINARY,
1542 .len = NF_CT_LABELS_MAX_SIZE },
1543 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1544 .len = NF_CT_LABELS_MAX_SIZE },
1545 [CTA_FILTER] = { .type = NLA_NESTED },
1546 [CTA_STATUS_MASK] = { .type = NLA_U32 },
1549 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1551 if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1554 return ctnetlink_filter_match(ct, data);
1557 static int ctnetlink_flush_conntrack(struct net *net,
1558 const struct nlattr * const cda[],
1559 u32 portid, int report, u8 family)
1561 struct ctnetlink_filter *filter = NULL;
1562 struct nf_ct_iter_data iter = {
1568 if (ctnetlink_needs_filter(family, cda)) {
1569 if (cda[CTA_FILTER])
1572 filter = ctnetlink_alloc_filter(cda, family);
1574 return PTR_ERR(filter);
1579 nf_ct_iterate_cleanup_net(ctnetlink_flush_iterate, &iter);
1585 static int ctnetlink_del_conntrack(struct sk_buff *skb,
1586 const struct nfnl_info *info,
1587 const struct nlattr * const cda[])
1589 u8 family = info->nfmsg->nfgen_family;
1590 struct nf_conntrack_tuple_hash *h;
1591 struct nf_conntrack_tuple tuple;
1592 struct nf_conntrack_zone zone;
1596 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1600 if (cda[CTA_TUPLE_ORIG])
1601 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1603 else if (cda[CTA_TUPLE_REPLY])
1604 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1607 u_int8_t u3 = info->nfmsg->version ? family : AF_UNSPEC;
1609 return ctnetlink_flush_conntrack(info->net, cda,
1610 NETLINK_CB(skb).portid,
1611 nlmsg_report(info->nlh), u3);
1617 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1621 ct = nf_ct_tuplehash_to_ctrack(h);
1623 if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1629 __be32 id = nla_get_be32(cda[CTA_ID]);
1631 if (id != (__force __be32)nf_ct_get_id(ct)) {
1637 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(info->nlh));
1643 static int ctnetlink_get_conntrack(struct sk_buff *skb,
1644 const struct nfnl_info *info,
1645 const struct nlattr * const cda[])
1647 u_int8_t u3 = info->nfmsg->nfgen_family;
1648 struct nf_conntrack_tuple_hash *h;
1649 struct nf_conntrack_tuple tuple;
1650 struct nf_conntrack_zone zone;
1651 struct sk_buff *skb2;
1655 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1656 struct netlink_dump_control c = {
1657 .start = ctnetlink_start,
1658 .dump = ctnetlink_dump_table,
1659 .done = ctnetlink_done,
1660 .data = (void *)cda,
1663 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1666 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1670 if (cda[CTA_TUPLE_ORIG])
1671 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1673 else if (cda[CTA_TUPLE_REPLY])
1674 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1682 h = nf_conntrack_find_get(info->net, &zone, &tuple);
1686 ct = nf_ct_tuplehash_to_ctrack(h);
1688 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1694 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid,
1695 info->nlh->nlmsg_seq,
1696 NFNL_MSG_TYPE(info->nlh->nlmsg_type), ct,
1704 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
1707 static int ctnetlink_done_list(struct netlink_callback *cb)
1709 struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
1712 nf_ct_put(ctx->last);
1717 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1718 static int ctnetlink_dump_one_entry(struct sk_buff *skb,
1719 struct netlink_callback *cb,
1723 struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
1724 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1725 u8 l3proto = nfmsg->nfgen_family;
1728 if (l3proto && nf_ct_l3num(ct) != l3proto)
1732 if (ct != ctx->last)
1738 /* We can't dump extension info for the unconfirmed
1739 * list because unconfirmed conntracks can have
1740 * ct->ext reallocated (and thus freed).
1742 * In the dying list case ct->ext can't be free'd
1743 * until after we drop pcpu->lock.
1745 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1747 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1750 if (!refcount_inc_not_zero(&ct->ct_general.use))
1761 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1767 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1769 struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx;
1770 struct nf_conn *last = ctx->last;
1771 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1772 const struct net *net = sock_net(skb->sk);
1773 struct nf_conntrack_net_ecache *ecache_net;
1774 struct nf_conntrack_tuple_hash *h;
1775 struct hlist_nulls_node *n;
1783 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1784 ecache_net = nf_conn_pernet_ecache(net);
1785 spin_lock_bh(&ecache_net->dying_lock);
1787 hlist_nulls_for_each_entry(h, n, &ecache_net->dying_list, hnnode) {
1791 ct = nf_ct_tuplehash_to_ctrack(h);
1792 if (last && last != ct)
1795 res = ctnetlink_dump_one_entry(skb, cb, ct, true);
1797 spin_unlock_bh(&ecache_net->dying_lock);
1806 spin_unlock_bh(&ecache_net->dying_lock);
1814 static int ctnetlink_get_ct_dying(struct sk_buff *skb,
1815 const struct nfnl_info *info,
1816 const struct nlattr * const cda[])
1818 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1819 struct netlink_dump_control c = {
1820 .dump = ctnetlink_dump_dying,
1821 .done = ctnetlink_done_list,
1823 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1829 static int ctnetlink_get_ct_unconfirmed(struct sk_buff *skb,
1830 const struct nfnl_info *info,
1831 const struct nlattr * const cda[])
1833 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1834 struct netlink_dump_control c = {
1835 .dump = ctnetlink_dump_unconfirmed,
1836 .done = ctnetlink_done_list,
1838 return netlink_dump_start(info->sk, skb, info->nlh, &c);
1844 #if IS_ENABLED(CONFIG_NF_NAT)
1846 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1847 enum nf_nat_manip_type manip,
1848 const struct nlattr *attr)
1851 const struct nf_nat_hook *nat_hook;
1854 nat_hook = rcu_dereference(nf_nat_hook);
1856 #ifdef CONFIG_MODULES
1858 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1859 if (request_module("nf-nat") < 0) {
1860 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1864 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1866 nat_hook = rcu_dereference(nf_nat_hook);
1873 err = nat_hook->parse_nat_setup(ct, manip, attr);
1874 if (err == -EAGAIN) {
1875 #ifdef CONFIG_MODULES
1877 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1878 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1879 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1883 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1894 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1899 /* Ignore these unchangable bits */
1900 on &= ~IPS_UNCHANGEABLE_MASK;
1901 off &= ~IPS_UNCHANGEABLE_MASK;
1903 for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1904 if (on & (1 << bit))
1905 set_bit(bit, &ct->status);
1906 else if (off & (1 << bit))
1907 clear_bit(bit, &ct->status);
1912 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1915 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1916 d = ct->status ^ status;
1918 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1922 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1923 /* SEEN_REPLY bit can only be set */
1926 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1927 /* ASSURED bit can only be set */
1930 __ctnetlink_change_status(ct, status, 0);
1935 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1937 #if IS_ENABLED(CONFIG_NF_NAT)
1940 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1943 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1948 return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1951 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1957 static int ctnetlink_change_helper(struct nf_conn *ct,
1958 const struct nlattr * const cda[])
1960 struct nf_conntrack_helper *helper;
1961 struct nf_conn_help *help = nfct_help(ct);
1962 char *helpname = NULL;
1963 struct nlattr *helpinfo = NULL;
1966 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1970 /* don't change helper of sibling connections */
1972 /* If we try to change the helper to the same thing twice,
1973 * treat the second attempt as a no-op instead of returning
1979 helper = rcu_dereference(help->helper);
1980 if (helper && !strcmp(helper->name, helpname))
1988 if (!strcmp(helpname, "")) {
1989 if (help && help->helper) {
1990 /* we had a helper before ... */
1991 nf_ct_remove_expectations(ct);
1992 RCU_INIT_POINTER(help->helper, NULL);
1999 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2000 nf_ct_protonum(ct));
2001 if (helper == NULL) {
2007 if (help->helper == helper) {
2008 /* update private helper data if allowed. */
2009 if (helper->from_nlattr)
2010 helper->from_nlattr(helpinfo, ct);
2015 /* we cannot set a helper for an existing conntrack */
2023 static int ctnetlink_change_timeout(struct nf_conn *ct,
2024 const struct nlattr * const cda[])
2026 u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2028 if (timeout > INT_MAX)
2030 WRITE_ONCE(ct->timeout, nfct_time_stamp + (u32)timeout);
2032 if (test_bit(IPS_DYING_BIT, &ct->status))
2038 #if defined(CONFIG_NF_CONNTRACK_MARK)
2039 static void ctnetlink_change_mark(struct nf_conn *ct,
2040 const struct nlattr * const cda[])
2042 u32 mark, newmark, mask = 0;
2044 if (cda[CTA_MARK_MASK])
2045 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2047 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2048 newmark = (ct->mark & mask) ^ mark;
2049 if (newmark != ct->mark)
2054 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
2055 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
2056 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
2057 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
2060 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
2061 const struct nlattr * const cda[])
2063 const struct nlattr *attr = cda[CTA_PROTOINFO];
2064 const struct nf_conntrack_l4proto *l4proto;
2065 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
2068 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
2069 protoinfo_policy, NULL);
2073 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
2074 if (l4proto->from_nlattr)
2075 err = l4proto->from_nlattr(tb, ct);
2080 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
2081 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
2082 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
2083 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
2086 static int change_seq_adj(struct nf_ct_seqadj *seq,
2087 const struct nlattr * const attr)
2090 struct nlattr *cda[CTA_SEQADJ_MAX+1];
2092 err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
2093 seqadj_policy, NULL);
2097 if (!cda[CTA_SEQADJ_CORRECTION_POS])
2100 seq->correction_pos =
2101 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
2103 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
2106 seq->offset_before =
2107 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
2109 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
2113 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
2119 ctnetlink_change_seq_adj(struct nf_conn *ct,
2120 const struct nlattr * const cda[])
2122 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
2128 spin_lock_bh(&ct->lock);
2129 if (cda[CTA_SEQ_ADJ_ORIG]) {
2130 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
2131 cda[CTA_SEQ_ADJ_ORIG]);
2135 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2138 if (cda[CTA_SEQ_ADJ_REPLY]) {
2139 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
2140 cda[CTA_SEQ_ADJ_REPLY]);
2144 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2147 spin_unlock_bh(&ct->lock);
2150 spin_unlock_bh(&ct->lock);
2154 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
2155 [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
2156 [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
2157 [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
2160 static int ctnetlink_change_synproxy(struct nf_conn *ct,
2161 const struct nlattr * const cda[])
2163 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
2164 struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
2170 err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
2171 cda[CTA_SYNPROXY], synproxy_policy,
2176 if (!tb[CTA_SYNPROXY_ISN] ||
2177 !tb[CTA_SYNPROXY_ITS] ||
2178 !tb[CTA_SYNPROXY_TSOFF])
2181 synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
2182 synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
2183 synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
2189 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
2191 #ifdef CONFIG_NF_CONNTRACK_LABELS
2192 size_t len = nla_len(cda[CTA_LABELS]);
2193 const void *mask = cda[CTA_LABELS_MASK];
2195 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
2199 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
2200 nla_len(cda[CTA_LABELS_MASK]) != len)
2202 mask = nla_data(cda[CTA_LABELS_MASK]);
2207 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
2214 ctnetlink_change_conntrack(struct nf_conn *ct,
2215 const struct nlattr * const cda[])
2219 /* only allow NAT changes and master assignation for new conntracks */
2220 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
2223 if (cda[CTA_HELP]) {
2224 err = ctnetlink_change_helper(ct, cda);
2229 if (cda[CTA_TIMEOUT]) {
2230 err = ctnetlink_change_timeout(ct, cda);
2235 if (cda[CTA_STATUS]) {
2236 err = ctnetlink_change_status(ct, cda);
2241 if (cda[CTA_PROTOINFO]) {
2242 err = ctnetlink_change_protoinfo(ct, cda);
2247 #if defined(CONFIG_NF_CONNTRACK_MARK)
2249 ctnetlink_change_mark(ct, cda);
2252 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2253 err = ctnetlink_change_seq_adj(ct, cda);
2258 if (cda[CTA_SYNPROXY]) {
2259 err = ctnetlink_change_synproxy(ct, cda);
2264 if (cda[CTA_LABELS]) {
2265 err = ctnetlink_attach_labels(ct, cda);
2273 static struct nf_conn *
2274 ctnetlink_create_conntrack(struct net *net,
2275 const struct nf_conntrack_zone *zone,
2276 const struct nlattr * const cda[],
2277 struct nf_conntrack_tuple *otuple,
2278 struct nf_conntrack_tuple *rtuple,
2283 struct nf_conntrack_helper *helper;
2284 struct nf_conn_tstamp *tstamp;
2287 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
2289 return ERR_PTR(-ENOMEM);
2291 if (!cda[CTA_TIMEOUT])
2294 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2295 if (timeout > INT_MAX)
2297 ct->timeout = (u32)timeout + nfct_time_stamp;
2300 if (cda[CTA_HELP]) {
2301 char *helpname = NULL;
2302 struct nlattr *helpinfo = NULL;
2304 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
2308 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2309 nf_ct_protonum(ct));
2310 if (helper == NULL) {
2312 #ifdef CONFIG_MODULES
2313 if (request_module("nfct-helper-%s", helpname) < 0) {
2319 helper = __nf_conntrack_helper_find(helpname,
2321 nf_ct_protonum(ct));
2331 struct nf_conn_help *help;
2333 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2338 /* set private helper data if allowed. */
2339 if (helper->from_nlattr)
2340 helper->from_nlattr(helpinfo, ct);
2342 /* disable helper auto-assignment for this entry */
2343 ct->status |= IPS_HELPER;
2344 RCU_INIT_POINTER(help->helper, helper);
2347 /* try an implicit helper assignation */
2348 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
2353 err = ctnetlink_setup_nat(ct, cda);
2357 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2358 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2359 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2360 nf_ct_labels_ext_add(ct);
2361 nfct_seqadj_ext_add(ct);
2362 nfct_synproxy_ext_add(ct);
2364 /* we must add conntrack extensions before confirmation. */
2365 ct->status |= IPS_CONFIRMED;
2367 if (cda[CTA_STATUS]) {
2368 err = ctnetlink_change_status(ct, cda);
2373 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2374 err = ctnetlink_change_seq_adj(ct, cda);
2379 memset(&ct->proto, 0, sizeof(ct->proto));
2380 if (cda[CTA_PROTOINFO]) {
2381 err = ctnetlink_change_protoinfo(ct, cda);
2386 if (cda[CTA_SYNPROXY]) {
2387 err = ctnetlink_change_synproxy(ct, cda);
2392 #if defined(CONFIG_NF_CONNTRACK_MARK)
2394 ctnetlink_change_mark(ct, cda);
2397 /* setup master conntrack: this is a confirmed expectation */
2398 if (cda[CTA_TUPLE_MASTER]) {
2399 struct nf_conntrack_tuple master;
2400 struct nf_conntrack_tuple_hash *master_h;
2401 struct nf_conn *master_ct;
2403 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2408 master_h = nf_conntrack_find_get(net, zone, &master);
2409 if (master_h == NULL) {
2413 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2414 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2415 ct->master = master_ct;
2417 tstamp = nf_conn_tstamp_find(ct);
2419 tstamp->start = ktime_get_real_ns();
2421 err = nf_conntrack_hash_check_insert(ct);
2432 nf_conntrack_free(ct);
2433 return ERR_PTR(err);
2436 static int ctnetlink_new_conntrack(struct sk_buff *skb,
2437 const struct nfnl_info *info,
2438 const struct nlattr * const cda[])
2440 struct nf_conntrack_tuple otuple, rtuple;
2441 struct nf_conntrack_tuple_hash *h = NULL;
2442 u_int8_t u3 = info->nfmsg->nfgen_family;
2443 struct nf_conntrack_zone zone;
2447 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2451 if (cda[CTA_TUPLE_ORIG]) {
2452 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2458 if (cda[CTA_TUPLE_REPLY]) {
2459 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2465 if (cda[CTA_TUPLE_ORIG])
2466 h = nf_conntrack_find_get(info->net, &zone, &otuple);
2467 else if (cda[CTA_TUPLE_REPLY])
2468 h = nf_conntrack_find_get(info->net, &zone, &rtuple);
2472 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
2473 enum ip_conntrack_events events;
2475 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2477 if (otuple.dst.protonum != rtuple.dst.protonum)
2480 ct = ctnetlink_create_conntrack(info->net, &zone, cda,
2481 &otuple, &rtuple, u3);
2486 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2487 events = 1 << IPCT_RELATED;
2489 events = 1 << IPCT_NEW;
2491 if (cda[CTA_LABELS] &&
2492 ctnetlink_attach_labels(ct, cda) == 0)
2493 events |= (1 << IPCT_LABEL);
2495 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2496 (1 << IPCT_ASSURED) |
2497 (1 << IPCT_HELPER) |
2498 (1 << IPCT_PROTOINFO) |
2499 (1 << IPCT_SEQADJ) |
2501 (1 << IPCT_SYNPROXY) |
2503 ct, NETLINK_CB(skb).portid,
2504 nlmsg_report(info->nlh));
2510 /* implicit 'else' */
2513 ct = nf_ct_tuplehash_to_ctrack(h);
2514 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL)) {
2515 err = ctnetlink_change_conntrack(ct, cda);
2517 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2518 (1 << IPCT_ASSURED) |
2519 (1 << IPCT_HELPER) |
2521 (1 << IPCT_PROTOINFO) |
2522 (1 << IPCT_SEQADJ) |
2524 (1 << IPCT_SYNPROXY),
2525 ct, NETLINK_CB(skb).portid,
2526 nlmsg_report(info->nlh));
2535 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2536 __u16 cpu, const struct ip_conntrack_stat *st)
2538 struct nlmsghdr *nlh;
2539 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2541 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2542 IPCTNL_MSG_CT_GET_STATS_CPU);
2543 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2544 NFNETLINK_V0, htons(cpu));
2548 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2549 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2550 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2551 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2552 htonl(st->insert_failed)) ||
2553 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2554 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2555 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2556 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2557 htonl(st->search_restart)) ||
2558 nla_put_be32(skb, CTA_STATS_CLASH_RESOLVE,
2559 htonl(st->clash_resolve)) ||
2560 nla_put_be32(skb, CTA_STATS_CHAIN_TOOLONG,
2561 htonl(st->chaintoolong)))
2562 goto nla_put_failure;
2564 nlmsg_end(skb, nlh);
2569 nlmsg_cancel(skb, nlh);
2574 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2577 struct net *net = sock_net(skb->sk);
2579 if (cb->args[0] == nr_cpu_ids)
2582 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2583 const struct ip_conntrack_stat *st;
2585 if (!cpu_possible(cpu))
2588 st = per_cpu_ptr(net->ct.stat, cpu);
2589 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2590 NETLINK_CB(cb->skb).portid,
2600 static int ctnetlink_stat_ct_cpu(struct sk_buff *skb,
2601 const struct nfnl_info *info,
2602 const struct nlattr * const cda[])
2604 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
2605 struct netlink_dump_control c = {
2606 .dump = ctnetlink_ct_stat_cpu_dump,
2608 return netlink_dump_start(info->sk, skb, info->nlh, &c);
2615 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2618 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2619 unsigned int nr_conntracks;
2620 struct nlmsghdr *nlh;
2622 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2623 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2628 nr_conntracks = nf_conntrack_count(net);
2629 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2630 goto nla_put_failure;
2632 if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2633 goto nla_put_failure;
2635 nlmsg_end(skb, nlh);
2640 nlmsg_cancel(skb, nlh);
2644 static int ctnetlink_stat_ct(struct sk_buff *skb, const struct nfnl_info *info,
2645 const struct nlattr * const cda[])
2647 struct sk_buff *skb2;
2650 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2654 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2655 info->nlh->nlmsg_seq,
2656 NFNL_MSG_TYPE(info->nlh->nlmsg_type),
2663 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
2666 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2667 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2668 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2669 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2670 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2671 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2672 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2673 .len = NF_CT_HELPER_NAME_LEN - 1 },
2674 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2675 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2676 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2677 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2678 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2681 static struct nf_conntrack_expect *
2682 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2683 struct nf_conntrack_helper *helper,
2684 struct nf_conntrack_tuple *tuple,
2685 struct nf_conntrack_tuple *mask);
2687 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2689 ctnetlink_glue_build_size(const struct nf_conn *ct)
2691 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2692 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2693 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2694 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2695 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2696 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2697 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2698 + nla_total_size(0) /* CTA_PROTOINFO */
2699 + nla_total_size(0) /* CTA_HELP */
2700 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2701 + ctnetlink_secctx_size(ct)
2702 + ctnetlink_acct_size(ct)
2703 + ctnetlink_timestamp_size(ct)
2704 #if IS_ENABLED(CONFIG_NF_NAT)
2705 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2706 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2708 #ifdef CONFIG_NF_CONNTRACK_MARK
2709 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2711 #ifdef CONFIG_NF_CONNTRACK_ZONES
2712 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2714 + ctnetlink_proto_size(ct)
2718 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2720 const struct nf_conntrack_zone *zone;
2721 struct nlattr *nest_parms;
2723 zone = nf_ct_zone(ct);
2725 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2727 goto nla_put_failure;
2728 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2729 goto nla_put_failure;
2730 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2731 NF_CT_ZONE_DIR_ORIG) < 0)
2732 goto nla_put_failure;
2733 nla_nest_end(skb, nest_parms);
2735 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2737 goto nla_put_failure;
2738 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2739 goto nla_put_failure;
2740 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2741 NF_CT_ZONE_DIR_REPL) < 0)
2742 goto nla_put_failure;
2743 nla_nest_end(skb, nest_parms);
2745 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2746 NF_CT_DEFAULT_ZONE_DIR) < 0)
2747 goto nla_put_failure;
2749 if (ctnetlink_dump_id(skb, ct) < 0)
2750 goto nla_put_failure;
2752 if (ctnetlink_dump_status(skb, ct) < 0)
2753 goto nla_put_failure;
2755 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
2756 goto nla_put_failure;
2758 if (ctnetlink_dump_protoinfo(skb, ct, false) < 0)
2759 goto nla_put_failure;
2761 if (ctnetlink_dump_acct(skb, ct, IPCTNL_MSG_CT_GET) < 0 ||
2762 ctnetlink_dump_timestamp(skb, ct) < 0)
2763 goto nla_put_failure;
2765 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2766 goto nla_put_failure;
2768 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2769 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2770 goto nla_put_failure;
2772 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2773 goto nla_put_failure;
2775 if ((ct->status & IPS_SEQ_ADJUST) &&
2776 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2777 goto nla_put_failure;
2779 if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2780 goto nla_put_failure;
2782 #ifdef CONFIG_NF_CONNTRACK_MARK
2783 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2784 goto nla_put_failure;
2786 if (ctnetlink_dump_labels(skb, ct) < 0)
2787 goto nla_put_failure;
2795 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2796 enum ip_conntrack_info ctinfo,
2797 u_int16_t ct_attr, u_int16_t ct_info_attr)
2799 struct nlattr *nest_parms;
2801 nest_parms = nla_nest_start(skb, ct_attr);
2803 goto nla_put_failure;
2805 if (__ctnetlink_glue_build(skb, ct) < 0)
2806 goto nla_put_failure;
2808 nla_nest_end(skb, nest_parms);
2810 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2811 goto nla_put_failure;
2820 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2822 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2823 unsigned long d = ct->status ^ status;
2825 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2826 /* SEEN_REPLY bit can only be set */
2829 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2830 /* ASSURED bit can only be set */
2833 /* This check is less strict than ctnetlink_change_status()
2834 * because callers often flip IPS_EXPECTED bits when sending
2835 * an NFQA_CT attribute to the kernel. So ignore the
2836 * unchangeable bits but do not error out. Also user programs
2837 * are allowed to clear the bits that they are allowed to change.
2839 __ctnetlink_change_status(ct, status, ~status);
2844 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2848 if (cda[CTA_TIMEOUT]) {
2849 err = ctnetlink_change_timeout(ct, cda);
2853 if (cda[CTA_STATUS]) {
2854 err = ctnetlink_update_status(ct, cda);
2858 if (cda[CTA_HELP]) {
2859 err = ctnetlink_change_helper(ct, cda);
2863 if (cda[CTA_LABELS]) {
2864 err = ctnetlink_attach_labels(ct, cda);
2868 #if defined(CONFIG_NF_CONNTRACK_MARK)
2869 if (cda[CTA_MARK]) {
2870 ctnetlink_change_mark(ct, cda);
2877 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2879 struct nlattr *cda[CTA_MAX+1];
2882 ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2887 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2890 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2891 const struct nf_conn *ct,
2892 struct nf_conntrack_tuple *tuple,
2893 struct nf_conntrack_tuple *mask)
2897 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2898 nf_ct_l3num(ct), NULL);
2902 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2903 nf_ct_l3num(ct), NULL);
2907 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2908 u32 portid, u32 report)
2910 struct nlattr *cda[CTA_EXPECT_MAX+1];
2911 struct nf_conntrack_tuple tuple, mask;
2912 struct nf_conntrack_helper *helper = NULL;
2913 struct nf_conntrack_expect *exp;
2916 err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2917 exp_nla_policy, NULL);
2921 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2926 if (cda[CTA_EXPECT_HELP_NAME]) {
2927 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2929 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2930 nf_ct_protonum(ct));
2935 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2936 helper, &tuple, &mask);
2938 return PTR_ERR(exp);
2940 err = nf_ct_expect_related_report(exp, portid, report, 0);
2941 nf_ct_expect_put(exp);
2945 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2946 enum ip_conntrack_info ctinfo, int diff)
2948 if (!(ct->status & IPS_NAT_MASK))
2951 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2954 static const struct nfnl_ct_hook ctnetlink_glue_hook = {
2955 .build_size = ctnetlink_glue_build_size,
2956 .build = ctnetlink_glue_build,
2957 .parse = ctnetlink_glue_parse,
2958 .attach_expect = ctnetlink_glue_attach_expect,
2959 .seq_adjust = ctnetlink_glue_seqadj,
2961 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2963 /***********************************************************************
2965 ***********************************************************************/
2967 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2968 const struct nf_conntrack_tuple *tuple,
2971 struct nlattr *nest_parms;
2973 nest_parms = nla_nest_start(skb, type);
2975 goto nla_put_failure;
2976 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2977 goto nla_put_failure;
2978 nla_nest_end(skb, nest_parms);
2986 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2987 const struct nf_conntrack_tuple *tuple,
2988 const struct nf_conntrack_tuple_mask *mask)
2990 const struct nf_conntrack_l4proto *l4proto;
2991 struct nf_conntrack_tuple m;
2992 struct nlattr *nest_parms;
2995 memset(&m, 0xFF, sizeof(m));
2996 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2997 m.src.u.all = mask->src.u.all;
2998 m.src.l3num = tuple->src.l3num;
2999 m.dst.protonum = tuple->dst.protonum;
3001 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
3003 goto nla_put_failure;
3006 ret = ctnetlink_dump_tuples_ip(skb, &m);
3008 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
3009 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
3013 if (unlikely(ret < 0))
3014 goto nla_put_failure;
3016 nla_nest_end(skb, nest_parms);
3024 static const union nf_inet_addr any_addr;
3026 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
3028 static siphash_aligned_key_t exp_id_seed;
3029 unsigned long a, b, c, d;
3031 net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
3033 a = (unsigned long)exp;
3034 b = (unsigned long)exp->helper;
3035 c = (unsigned long)exp->master;
3036 d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
3039 return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
3041 return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
3046 ctnetlink_exp_dump_expect(struct sk_buff *skb,
3047 const struct nf_conntrack_expect *exp)
3049 struct nf_conn *master = exp->master;
3050 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
3051 struct nf_conn_help *help;
3052 #if IS_ENABLED(CONFIG_NF_NAT)
3053 struct nlattr *nest_parms;
3054 struct nf_conntrack_tuple nat_tuple = {};
3056 struct nf_ct_helper_expectfn *expfn;
3061 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
3062 goto nla_put_failure;
3063 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
3064 goto nla_put_failure;
3065 if (ctnetlink_exp_dump_tuple(skb,
3066 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
3067 CTA_EXPECT_MASTER) < 0)
3068 goto nla_put_failure;
3070 #if IS_ENABLED(CONFIG_NF_NAT)
3071 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
3072 exp->saved_proto.all) {
3073 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
3075 goto nla_put_failure;
3077 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
3078 goto nla_put_failure;
3080 nat_tuple.src.l3num = nf_ct_l3num(master);
3081 nat_tuple.src.u3 = exp->saved_addr;
3082 nat_tuple.dst.protonum = nf_ct_protonum(master);
3083 nat_tuple.src.u = exp->saved_proto;
3085 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
3086 CTA_EXPECT_NAT_TUPLE) < 0)
3087 goto nla_put_failure;
3088 nla_nest_end(skb, nest_parms);
3091 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
3092 nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
3093 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
3094 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
3095 goto nla_put_failure;
3096 help = nfct_help(master);
3098 struct nf_conntrack_helper *helper;
3100 helper = rcu_dereference(help->helper);
3102 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
3103 goto nla_put_failure;
3105 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
3106 if (expfn != NULL &&
3107 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
3108 goto nla_put_failure;
3117 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
3118 int event, const struct nf_conntrack_expect *exp)
3120 struct nlmsghdr *nlh;
3121 unsigned int flags = portid ? NLM_F_MULTI : 0;
3123 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
3124 nlh = nfnl_msg_put(skb, portid, seq, event, flags,
3125 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3129 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3130 goto nla_put_failure;
3132 nlmsg_end(skb, nlh);
3137 nlmsg_cancel(skb, nlh);
3141 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3143 ctnetlink_expect_event(unsigned int events, const struct nf_exp_event *item)
3145 struct nf_conntrack_expect *exp = item->exp;
3146 struct net *net = nf_ct_exp_net(exp);
3147 struct nlmsghdr *nlh;
3148 struct sk_buff *skb;
3149 unsigned int type, group;
3152 if (events & (1 << IPEXP_DESTROY)) {
3153 type = IPCTNL_MSG_EXP_DELETE;
3154 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
3155 } else if (events & (1 << IPEXP_NEW)) {
3156 type = IPCTNL_MSG_EXP_NEW;
3157 flags = NLM_F_CREATE|NLM_F_EXCL;
3158 group = NFNLGRP_CONNTRACK_EXP_NEW;
3162 if (!item->report && !nfnetlink_has_listeners(net, group))
3165 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
3169 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
3170 nlh = nfnl_msg_put(skb, item->portid, 0, type, flags,
3171 exp->tuple.src.l3num, NFNETLINK_V0, 0);
3175 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3176 goto nla_put_failure;
3178 nlmsg_end(skb, nlh);
3179 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
3183 nlmsg_cancel(skb, nlh);
3187 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
3191 static int ctnetlink_exp_done(struct netlink_callback *cb)
3194 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
3199 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3201 struct net *net = sock_net(skb->sk);
3202 struct nf_conntrack_expect *exp, *last;
3203 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3204 u_int8_t l3proto = nfmsg->nfgen_family;
3207 last = (struct nf_conntrack_expect *)cb->args[1];
3208 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
3210 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
3212 if (l3proto && exp->tuple.src.l3num != l3proto)
3215 if (!net_eq(nf_ct_net(exp->master), net))
3223 if (ctnetlink_exp_fill_info(skb,
3224 NETLINK_CB(cb->skb).portid,
3228 if (!refcount_inc_not_zero(&exp->use))
3230 cb->args[1] = (unsigned long)exp;
3242 nf_ct_expect_put(last);
3248 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3250 struct nf_conntrack_expect *exp, *last;
3251 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3252 struct nf_conn *ct = cb->data;
3253 struct nf_conn_help *help = nfct_help(ct);
3254 u_int8_t l3proto = nfmsg->nfgen_family;
3260 last = (struct nf_conntrack_expect *)cb->args[1];
3262 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
3263 if (l3proto && exp->tuple.src.l3num != l3proto)
3270 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
3274 if (!refcount_inc_not_zero(&exp->use))
3276 cb->args[1] = (unsigned long)exp;
3288 nf_ct_expect_put(last);
3293 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
3294 struct sk_buff *skb,
3295 const struct nlmsghdr *nlh,
3296 const struct nlattr * const cda[],
3297 struct netlink_ext_ack *extack)
3300 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3301 u_int8_t u3 = nfmsg->nfgen_family;
3302 struct nf_conntrack_tuple tuple;
3303 struct nf_conntrack_tuple_hash *h;
3305 struct nf_conntrack_zone zone;
3306 struct netlink_dump_control c = {
3307 .dump = ctnetlink_exp_ct_dump_table,
3308 .done = ctnetlink_exp_done,
3311 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3316 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3320 h = nf_conntrack_find_get(net, &zone, &tuple);
3324 ct = nf_ct_tuplehash_to_ctrack(h);
3325 /* No expectation linked to this connection tracking. */
3326 if (!nfct_help(ct)) {
3333 err = netlink_dump_start(ctnl, skb, nlh, &c);
3339 static int ctnetlink_get_expect(struct sk_buff *skb,
3340 const struct nfnl_info *info,
3341 const struct nlattr * const cda[])
3343 u_int8_t u3 = info->nfmsg->nfgen_family;
3344 struct nf_conntrack_tuple tuple;
3345 struct nf_conntrack_expect *exp;
3346 struct nf_conntrack_zone zone;
3347 struct sk_buff *skb2;
3350 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3351 if (cda[CTA_EXPECT_MASTER])
3352 return ctnetlink_dump_exp_ct(info->net, info->sk, skb,
3356 struct netlink_dump_control c = {
3357 .dump = ctnetlink_exp_dump_table,
3358 .done = ctnetlink_exp_done,
3360 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3364 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3368 if (cda[CTA_EXPECT_TUPLE])
3369 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3371 else if (cda[CTA_EXPECT_MASTER])
3372 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3380 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3384 if (cda[CTA_EXPECT_ID]) {
3385 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3387 if (id != nf_expect_get_id(exp)) {
3388 nf_ct_expect_put(exp);
3393 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3395 nf_ct_expect_put(exp);
3400 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3401 info->nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
3404 nf_ct_expect_put(exp);
3410 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
3413 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3415 const struct nf_conn_help *m_help;
3416 const char *name = data;
3418 m_help = nfct_help(exp->master);
3420 return strcmp(m_help->helper->name, name) == 0;
3423 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3428 static int ctnetlink_del_expect(struct sk_buff *skb,
3429 const struct nfnl_info *info,
3430 const struct nlattr * const cda[])
3432 u_int8_t u3 = info->nfmsg->nfgen_family;
3433 struct nf_conntrack_expect *exp;
3434 struct nf_conntrack_tuple tuple;
3435 struct nf_conntrack_zone zone;
3438 if (cda[CTA_EXPECT_TUPLE]) {
3439 /* delete a single expect by tuple */
3440 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3444 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3449 /* bump usage count to 2 */
3450 exp = nf_ct_expect_find_get(info->net, &zone, &tuple);
3454 if (cda[CTA_EXPECT_ID]) {
3455 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3456 if (ntohl(id) != (u32)(unsigned long)exp) {
3457 nf_ct_expect_put(exp);
3462 /* after list removal, usage count == 1 */
3463 spin_lock_bh(&nf_conntrack_expect_lock);
3464 if (del_timer(&exp->timeout)) {
3465 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3466 nlmsg_report(info->nlh));
3467 nf_ct_expect_put(exp);
3469 spin_unlock_bh(&nf_conntrack_expect_lock);
3470 /* have to put what we 'get' above.
3471 * after this line usage count == 0 */
3472 nf_ct_expect_put(exp);
3473 } else if (cda[CTA_EXPECT_HELP_NAME]) {
3474 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3476 nf_ct_expect_iterate_net(info->net, expect_iter_name, name,
3477 NETLINK_CB(skb).portid,
3478 nlmsg_report(info->nlh));
3480 /* This basically means we have to flush everything*/
3481 nf_ct_expect_iterate_net(info->net, expect_iter_all, NULL,
3482 NETLINK_CB(skb).portid,
3483 nlmsg_report(info->nlh));
3489 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3490 const struct nlattr * const cda[])
3492 if (cda[CTA_EXPECT_TIMEOUT]) {
3493 if (!del_timer(&x->timeout))
3496 x->timeout.expires = jiffies +
3497 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3498 add_timer(&x->timeout);
3503 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3504 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3505 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3509 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3510 struct nf_conntrack_expect *exp,
3513 #if IS_ENABLED(CONFIG_NF_NAT)
3514 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3515 struct nf_conntrack_tuple nat_tuple = {};
3518 err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3519 exp_nat_nla_policy, NULL);
3523 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3526 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3527 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3532 exp->saved_addr = nat_tuple.src.u3;
3533 exp->saved_proto = nat_tuple.src.u;
3534 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3542 static struct nf_conntrack_expect *
3543 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3544 struct nf_conntrack_helper *helper,
3545 struct nf_conntrack_tuple *tuple,
3546 struct nf_conntrack_tuple *mask)
3548 u_int32_t class = 0;
3549 struct nf_conntrack_expect *exp;
3550 struct nf_conn_help *help;
3553 help = nfct_help(ct);
3555 return ERR_PTR(-EOPNOTSUPP);
3557 if (cda[CTA_EXPECT_CLASS] && helper) {
3558 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3559 if (class > helper->expect_class_max)
3560 return ERR_PTR(-EINVAL);
3562 exp = nf_ct_expect_alloc(ct);
3564 return ERR_PTR(-ENOMEM);
3566 if (cda[CTA_EXPECT_FLAGS]) {
3567 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3568 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3572 if (cda[CTA_EXPECT_FN]) {
3573 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3574 struct nf_ct_helper_expectfn *expfn;
3576 expfn = nf_ct_helper_expectfn_find_by_name(name);
3577 if (expfn == NULL) {
3581 exp->expectfn = expfn->expectfn;
3583 exp->expectfn = NULL;
3587 exp->helper = helper;
3588 exp->tuple = *tuple;
3589 exp->mask.src.u3 = mask->src.u3;
3590 exp->mask.src.u.all = mask->src.u.all;
3592 if (cda[CTA_EXPECT_NAT]) {
3593 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3594 exp, nf_ct_l3num(ct));
3600 nf_ct_expect_put(exp);
3601 return ERR_PTR(err);
3605 ctnetlink_create_expect(struct net *net,
3606 const struct nf_conntrack_zone *zone,
3607 const struct nlattr * const cda[],
3608 u_int8_t u3, u32 portid, int report)
3610 struct nf_conntrack_tuple tuple, mask, master_tuple;
3611 struct nf_conntrack_tuple_hash *h = NULL;
3612 struct nf_conntrack_helper *helper = NULL;
3613 struct nf_conntrack_expect *exp;
3617 /* caller guarantees that those three CTA_EXPECT_* exist */
3618 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3622 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3626 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3631 /* Look for master conntrack of this expectation */
3632 h = nf_conntrack_find_get(net, zone, &master_tuple);
3635 ct = nf_ct_tuplehash_to_ctrack(h);
3638 if (cda[CTA_EXPECT_HELP_NAME]) {
3639 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3641 helper = __nf_conntrack_helper_find(helpname, u3,
3642 nf_ct_protonum(ct));
3643 if (helper == NULL) {
3645 #ifdef CONFIG_MODULES
3646 if (request_module("nfct-helper-%s", helpname) < 0) {
3651 helper = __nf_conntrack_helper_find(helpname, u3,
3652 nf_ct_protonum(ct));
3664 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3670 err = nf_ct_expect_related_report(exp, portid, report, 0);
3671 nf_ct_expect_put(exp);
3679 static int ctnetlink_new_expect(struct sk_buff *skb,
3680 const struct nfnl_info *info,
3681 const struct nlattr * const cda[])
3683 u_int8_t u3 = info->nfmsg->nfgen_family;
3684 struct nf_conntrack_tuple tuple;
3685 struct nf_conntrack_expect *exp;
3686 struct nf_conntrack_zone zone;
3689 if (!cda[CTA_EXPECT_TUPLE]
3690 || !cda[CTA_EXPECT_MASK]
3691 || !cda[CTA_EXPECT_MASTER])
3694 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3698 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3703 spin_lock_bh(&nf_conntrack_expect_lock);
3704 exp = __nf_ct_expect_find(info->net, &zone, &tuple);
3706 spin_unlock_bh(&nf_conntrack_expect_lock);
3708 if (info->nlh->nlmsg_flags & NLM_F_CREATE) {
3709 err = ctnetlink_create_expect(info->net, &zone, cda, u3,
3710 NETLINK_CB(skb).portid,
3711 nlmsg_report(info->nlh));
3717 if (!(info->nlh->nlmsg_flags & NLM_F_EXCL))
3718 err = ctnetlink_change_expect(exp, cda);
3719 spin_unlock_bh(&nf_conntrack_expect_lock);
3725 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3726 const struct ip_conntrack_stat *st)
3728 struct nlmsghdr *nlh;
3729 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3731 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3732 IPCTNL_MSG_EXP_GET_STATS_CPU);
3733 nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
3734 NFNETLINK_V0, htons(cpu));
3738 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3739 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3740 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3741 goto nla_put_failure;
3743 nlmsg_end(skb, nlh);
3748 nlmsg_cancel(skb, nlh);
3753 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3756 struct net *net = sock_net(skb->sk);
3758 if (cb->args[0] == nr_cpu_ids)
3761 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3762 const struct ip_conntrack_stat *st;
3764 if (!cpu_possible(cpu))
3767 st = per_cpu_ptr(net->ct.stat, cpu);
3768 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3778 static int ctnetlink_stat_exp_cpu(struct sk_buff *skb,
3779 const struct nfnl_info *info,
3780 const struct nlattr * const cda[])
3782 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3783 struct netlink_dump_control c = {
3784 .dump = ctnetlink_exp_stat_cpu_dump,
3786 return netlink_dump_start(info->sk, skb, info->nlh, &c);
3792 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3793 static struct nf_ct_event_notifier ctnl_notifier = {
3794 .ct_event = ctnetlink_conntrack_event,
3795 .exp_event = ctnetlink_expect_event,
3799 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3800 [IPCTNL_MSG_CT_NEW] = {
3801 .call = ctnetlink_new_conntrack,
3802 .type = NFNL_CB_MUTEX,
3803 .attr_count = CTA_MAX,
3804 .policy = ct_nla_policy
3806 [IPCTNL_MSG_CT_GET] = {
3807 .call = ctnetlink_get_conntrack,
3808 .type = NFNL_CB_MUTEX,
3809 .attr_count = CTA_MAX,
3810 .policy = ct_nla_policy
3812 [IPCTNL_MSG_CT_DELETE] = {
3813 .call = ctnetlink_del_conntrack,
3814 .type = NFNL_CB_MUTEX,
3815 .attr_count = CTA_MAX,
3816 .policy = ct_nla_policy
3818 [IPCTNL_MSG_CT_GET_CTRZERO] = {
3819 .call = ctnetlink_get_conntrack,
3820 .type = NFNL_CB_MUTEX,
3821 .attr_count = CTA_MAX,
3822 .policy = ct_nla_policy
3824 [IPCTNL_MSG_CT_GET_STATS_CPU] = {
3825 .call = ctnetlink_stat_ct_cpu,
3826 .type = NFNL_CB_MUTEX,
3828 [IPCTNL_MSG_CT_GET_STATS] = {
3829 .call = ctnetlink_stat_ct,
3830 .type = NFNL_CB_MUTEX,
3832 [IPCTNL_MSG_CT_GET_DYING] = {
3833 .call = ctnetlink_get_ct_dying,
3834 .type = NFNL_CB_MUTEX,
3836 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = {
3837 .call = ctnetlink_get_ct_unconfirmed,
3838 .type = NFNL_CB_MUTEX,
3842 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3843 [IPCTNL_MSG_EXP_GET] = {
3844 .call = ctnetlink_get_expect,
3845 .type = NFNL_CB_MUTEX,
3846 .attr_count = CTA_EXPECT_MAX,
3847 .policy = exp_nla_policy
3849 [IPCTNL_MSG_EXP_NEW] = {
3850 .call = ctnetlink_new_expect,
3851 .type = NFNL_CB_MUTEX,
3852 .attr_count = CTA_EXPECT_MAX,
3853 .policy = exp_nla_policy
3855 [IPCTNL_MSG_EXP_DELETE] = {
3856 .call = ctnetlink_del_expect,
3857 .type = NFNL_CB_MUTEX,
3858 .attr_count = CTA_EXPECT_MAX,
3859 .policy = exp_nla_policy
3861 [IPCTNL_MSG_EXP_GET_STATS_CPU] = {
3862 .call = ctnetlink_stat_exp_cpu,
3863 .type = NFNL_CB_MUTEX,
3867 static const struct nfnetlink_subsystem ctnl_subsys = {
3868 .name = "conntrack",
3869 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3870 .cb_count = IPCTNL_MSG_MAX,
3874 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3875 .name = "conntrack_expect",
3876 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3877 .cb_count = IPCTNL_MSG_EXP_MAX,
3881 MODULE_ALIAS("ip_conntrack_netlink");
3882 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3883 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3885 static int __net_init ctnetlink_net_init(struct net *net)
3887 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3888 nf_conntrack_register_notifier(net, &ctnl_notifier);
3893 static void ctnetlink_net_pre_exit(struct net *net)
3895 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3896 nf_conntrack_unregister_notifier(net);
3900 static struct pernet_operations ctnetlink_net_ops = {
3901 .init = ctnetlink_net_init,
3902 .pre_exit = ctnetlink_net_pre_exit,
3905 static int __init ctnetlink_init(void)
3909 BUILD_BUG_ON(sizeof(struct ctnetlink_list_dump_ctx) > sizeof_field(struct netlink_callback, ctx));
3911 ret = nfnetlink_subsys_register(&ctnl_subsys);
3913 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3917 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3919 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3920 goto err_unreg_subsys;
3923 ret = register_pernet_subsys(&ctnetlink_net_ops);
3925 pr_err("ctnetlink_init: cannot register pernet operations\n");
3926 goto err_unreg_exp_subsys;
3928 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3929 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3930 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3934 err_unreg_exp_subsys:
3935 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3937 nfnetlink_subsys_unregister(&ctnl_subsys);
3942 static void __exit ctnetlink_exit(void)
3944 unregister_pernet_subsys(&ctnetlink_net_ops);
3945 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3946 nfnetlink_subsys_unregister(&ctnl_subsys);
3947 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3948 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3953 module_init(ctnetlink_init);
3954 module_exit(ctnetlink_exit);