1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/security.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
32 #include <linux/siphash.h>
34 #include <linux/netfilter.h>
35 #include <net/netlink.h>
37 #include <net/netfilter/nf_conntrack.h>
38 #include <net/netfilter/nf_conntrack_core.h>
39 #include <net/netfilter/nf_conntrack_expect.h>
40 #include <net/netfilter/nf_conntrack_helper.h>
41 #include <net/netfilter/nf_conntrack_seqadj.h>
42 #include <net/netfilter/nf_conntrack_l4proto.h>
43 #include <net/netfilter/nf_conntrack_tuple.h>
44 #include <net/netfilter/nf_conntrack_acct.h>
45 #include <net/netfilter/nf_conntrack_zones.h>
46 #include <net/netfilter/nf_conntrack_timestamp.h>
47 #include <net/netfilter/nf_conntrack_labels.h>
48 #include <net/netfilter/nf_conntrack_synproxy.h>
49 #if IS_ENABLED(CONFIG_NF_NAT)
50 #include <net/netfilter/nf_nat.h>
51 #include <net/netfilter/nf_nat_helper.h>
54 #include <linux/netfilter/nfnetlink.h>
55 #include <linux/netfilter/nfnetlink_conntrack.h>
57 #include "nf_internals.h"
59 MODULE_LICENSE("GPL");
61 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
62 const struct nf_conntrack_tuple *tuple,
63 const struct nf_conntrack_l4proto *l4proto)
66 struct nlattr *nest_parms;
68 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO);
71 if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
74 if (likely(l4proto->tuple_to_nlattr))
75 ret = l4proto->tuple_to_nlattr(skb, tuple);
77 nla_nest_end(skb, nest_parms);
85 static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
86 const struct nf_conntrack_tuple *tuple)
88 if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
89 nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
94 static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
95 const struct nf_conntrack_tuple *tuple)
97 if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
98 nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
103 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
104 const struct nf_conntrack_tuple *tuple)
107 struct nlattr *nest_parms;
109 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP);
111 goto nla_put_failure;
113 switch (tuple->src.l3num) {
115 ret = ipv4_tuple_to_nlattr(skb, tuple);
118 ret = ipv6_tuple_to_nlattr(skb, tuple);
122 nla_nest_end(skb, nest_parms);
130 static int ctnetlink_dump_tuples(struct sk_buff *skb,
131 const struct nf_conntrack_tuple *tuple)
133 const struct nf_conntrack_l4proto *l4proto;
137 ret = ctnetlink_dump_tuples_ip(skb, tuple);
140 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
141 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
147 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
148 const struct nf_conntrack_zone *zone, int dir)
150 if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
152 if (nla_put_be16(skb, attrtype, htons(zone->id)))
153 goto nla_put_failure;
160 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
162 if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
163 goto nla_put_failure;
170 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
172 long timeout = nf_ct_expires(ct) / HZ;
174 if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
175 goto nla_put_failure;
182 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
184 const struct nf_conntrack_l4proto *l4proto;
185 struct nlattr *nest_proto;
188 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
189 if (!l4proto->to_nlattr)
192 nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
194 goto nla_put_failure;
196 ret = l4proto->to_nlattr(skb, nest_proto, ct);
198 nla_nest_end(skb, nest_proto);
206 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
207 const struct nf_conn *ct)
209 struct nlattr *nest_helper;
210 const struct nf_conn_help *help = nfct_help(ct);
211 struct nf_conntrack_helper *helper;
216 helper = rcu_dereference(help->helper);
220 nest_helper = nla_nest_start(skb, CTA_HELP);
222 goto nla_put_failure;
223 if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
224 goto nla_put_failure;
226 if (helper->to_nlattr)
227 helper->to_nlattr(skb, ct);
229 nla_nest_end(skb, nest_helper);
238 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
239 enum ip_conntrack_dir dir, int type)
241 enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
242 struct nf_conn_counter *counter = acct->counter;
243 struct nlattr *nest_count;
246 if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
247 pkts = atomic64_xchg(&counter[dir].packets, 0);
248 bytes = atomic64_xchg(&counter[dir].bytes, 0);
250 pkts = atomic64_read(&counter[dir].packets);
251 bytes = atomic64_read(&counter[dir].bytes);
254 nest_count = nla_nest_start(skb, attr);
256 goto nla_put_failure;
258 if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
260 nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
262 goto nla_put_failure;
264 nla_nest_end(skb, nest_count);
273 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
275 struct nf_conn_acct *acct = nf_conn_acct_find(ct);
280 if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
282 if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
289 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
291 struct nlattr *nest_count;
292 const struct nf_conn_tstamp *tstamp;
294 tstamp = nf_conn_tstamp_find(ct);
298 nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
300 goto nla_put_failure;
302 if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
303 CTA_TIMESTAMP_PAD) ||
304 (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
305 cpu_to_be64(tstamp->stop),
307 goto nla_put_failure;
308 nla_nest_end(skb, nest_count);
316 #ifdef CONFIG_NF_CONNTRACK_MARK
317 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
319 if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
320 goto nla_put_failure;
327 #define ctnetlink_dump_mark(a, b) (0)
330 #ifdef CONFIG_NF_CONNTRACK_SECMARK
331 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
333 struct nlattr *nest_secctx;
337 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
342 nest_secctx = nla_nest_start(skb, CTA_SECCTX);
344 goto nla_put_failure;
346 if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
347 goto nla_put_failure;
348 nla_nest_end(skb, nest_secctx);
352 security_release_secctx(secctx, len);
356 #define ctnetlink_dump_secctx(a, b) (0)
359 #ifdef CONFIG_NF_CONNTRACK_LABELS
360 static inline int ctnetlink_label_size(const struct nf_conn *ct)
362 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
366 return nla_total_size(sizeof(labels->bits));
370 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
372 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
380 if (labels->bits[i] != 0)
381 return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
384 } while (i < ARRAY_SIZE(labels->bits));
389 #define ctnetlink_dump_labels(a, b) (0)
390 #define ctnetlink_label_size(a) (0)
393 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
395 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
397 struct nlattr *nest_parms;
399 if (!(ct->status & IPS_EXPECTED))
402 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
404 goto nla_put_failure;
405 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
406 goto nla_put_failure;
407 nla_nest_end(skb, nest_parms);
416 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
418 struct nlattr *nest_parms;
420 nest_parms = nla_nest_start(skb, type);
422 goto nla_put_failure;
424 if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
425 htonl(seq->correction_pos)) ||
426 nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
427 htonl(seq->offset_before)) ||
428 nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
429 htonl(seq->offset_after)))
430 goto nla_put_failure;
432 nla_nest_end(skb, nest_parms);
440 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
442 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
443 struct nf_ct_seqadj *seq;
445 if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
448 spin_lock_bh(&ct->lock);
449 seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
450 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
453 seq = &seqadj->seq[IP_CT_DIR_REPLY];
454 if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
457 spin_unlock_bh(&ct->lock);
460 spin_unlock_bh(&ct->lock);
464 static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
466 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
467 struct nlattr *nest_parms;
472 nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
474 goto nla_put_failure;
476 if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
477 nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
478 nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
479 goto nla_put_failure;
481 nla_nest_end(skb, nest_parms);
489 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
491 __be32 id = (__force __be32)nf_ct_get_id(ct);
493 if (nla_put_be32(skb, CTA_ID, id))
494 goto nla_put_failure;
501 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
503 if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
504 goto nla_put_failure;
511 /* all these functions access ct->ext. Caller must either hold a reference
512 * on ct or prevent its deletion by holding either the bucket spinlock or
513 * pcpu dying list lock.
515 static int ctnetlink_dump_extinfo(struct sk_buff *skb,
516 struct nf_conn *ct, u32 type)
518 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
519 ctnetlink_dump_timestamp(skb, ct) < 0 ||
520 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
521 ctnetlink_dump_labels(skb, ct) < 0 ||
522 ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
523 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
529 static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
531 if (ctnetlink_dump_status(skb, ct) < 0 ||
532 ctnetlink_dump_mark(skb, ct) < 0 ||
533 ctnetlink_dump_secctx(skb, ct) < 0 ||
534 ctnetlink_dump_id(skb, ct) < 0 ||
535 ctnetlink_dump_use(skb, ct) < 0 ||
536 ctnetlink_dump_master(skb, ct) < 0)
539 if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
540 (ctnetlink_dump_timeout(skb, ct) < 0 ||
541 ctnetlink_dump_protoinfo(skb, ct) < 0))
548 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
549 struct nf_conn *ct, bool extinfo, unsigned int flags)
551 const struct nf_conntrack_zone *zone;
552 struct nlmsghdr *nlh;
553 struct nfgenmsg *nfmsg;
554 struct nlattr *nest_parms;
558 flags |= NLM_F_MULTI;
559 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
560 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
564 nfmsg = nlmsg_data(nlh);
565 nfmsg->nfgen_family = nf_ct_l3num(ct);
566 nfmsg->version = NFNETLINK_V0;
569 zone = nf_ct_zone(ct);
571 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
573 goto nla_put_failure;
574 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
575 goto nla_put_failure;
576 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
577 NF_CT_ZONE_DIR_ORIG) < 0)
578 goto nla_put_failure;
579 nla_nest_end(skb, nest_parms);
581 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
583 goto nla_put_failure;
584 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
585 goto nla_put_failure;
586 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
587 NF_CT_ZONE_DIR_REPL) < 0)
588 goto nla_put_failure;
589 nla_nest_end(skb, nest_parms);
591 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
592 NF_CT_DEFAULT_ZONE_DIR) < 0)
593 goto nla_put_failure;
595 if (ctnetlink_dump_info(skb, ct) < 0)
596 goto nla_put_failure;
597 if (extinfo && ctnetlink_dump_extinfo(skb, ct, type) < 0)
598 goto nla_put_failure;
605 nlmsg_cancel(skb, nlh);
609 static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
610 [CTA_IP_V4_SRC] = { .type = NLA_U32 },
611 [CTA_IP_V4_DST] = { .type = NLA_U32 },
612 [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
613 [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
616 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
617 static size_t ctnetlink_proto_size(const struct nf_conn *ct)
619 const struct nf_conntrack_l4proto *l4proto;
620 size_t len, len4 = 0;
622 len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
623 len *= 3u; /* ORIG, REPLY, MASTER */
625 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
626 len += l4proto->nlattr_size;
627 if (l4proto->nlattr_tuple_size) {
628 len4 = l4proto->nlattr_tuple_size();
629 len4 *= 3u; /* ORIG, REPLY, MASTER */
636 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
638 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
640 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
641 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
642 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
646 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
648 #ifdef CONFIG_NF_CONNTRACK_SECMARK
651 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
655 return nla_total_size(0) /* CTA_SECCTX */
656 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
662 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
664 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
665 if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
667 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
673 #ifdef CONFIG_NF_CONNTRACK_EVENTS
674 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
676 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
677 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
678 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
679 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
680 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
681 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
682 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
683 + ctnetlink_acct_size(ct)
684 + ctnetlink_timestamp_size(ct)
685 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
686 + nla_total_size(0) /* CTA_PROTOINFO */
687 + nla_total_size(0) /* CTA_HELP */
688 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
689 + ctnetlink_secctx_size(ct)
690 #if IS_ENABLED(CONFIG_NF_NAT)
691 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
692 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
694 #ifdef CONFIG_NF_CONNTRACK_MARK
695 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
697 #ifdef CONFIG_NF_CONNTRACK_ZONES
698 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
700 + ctnetlink_proto_size(ct)
701 + ctnetlink_label_size(ct)
706 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
708 const struct nf_conntrack_zone *zone;
710 struct nlmsghdr *nlh;
711 struct nfgenmsg *nfmsg;
712 struct nlattr *nest_parms;
713 struct nf_conn *ct = item->ct;
716 unsigned int flags = 0, group;
719 if (events & (1 << IPCT_DESTROY)) {
720 type = IPCTNL_MSG_CT_DELETE;
721 group = NFNLGRP_CONNTRACK_DESTROY;
722 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
723 type = IPCTNL_MSG_CT_NEW;
724 flags = NLM_F_CREATE|NLM_F_EXCL;
725 group = NFNLGRP_CONNTRACK_NEW;
727 type = IPCTNL_MSG_CT_NEW;
728 group = NFNLGRP_CONNTRACK_UPDATE;
733 if (!item->report && !nfnetlink_has_listeners(net, group))
736 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
740 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
741 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
745 nfmsg = nlmsg_data(nlh);
746 nfmsg->nfgen_family = nf_ct_l3num(ct);
747 nfmsg->version = NFNETLINK_V0;
750 zone = nf_ct_zone(ct);
752 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
754 goto nla_put_failure;
755 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
756 goto nla_put_failure;
757 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
758 NF_CT_ZONE_DIR_ORIG) < 0)
759 goto nla_put_failure;
760 nla_nest_end(skb, nest_parms);
762 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
764 goto nla_put_failure;
765 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
766 goto nla_put_failure;
767 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
768 NF_CT_ZONE_DIR_REPL) < 0)
769 goto nla_put_failure;
770 nla_nest_end(skb, nest_parms);
772 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
773 NF_CT_DEFAULT_ZONE_DIR) < 0)
774 goto nla_put_failure;
776 if (ctnetlink_dump_id(skb, ct) < 0)
777 goto nla_put_failure;
779 if (ctnetlink_dump_status(skb, ct) < 0)
780 goto nla_put_failure;
782 if (events & (1 << IPCT_DESTROY)) {
783 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
784 ctnetlink_dump_timestamp(skb, ct) < 0)
785 goto nla_put_failure;
787 if (ctnetlink_dump_timeout(skb, ct) < 0)
788 goto nla_put_failure;
790 if (events & (1 << IPCT_PROTOINFO)
791 && ctnetlink_dump_protoinfo(skb, ct) < 0)
792 goto nla_put_failure;
794 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
795 && ctnetlink_dump_helpinfo(skb, ct) < 0)
796 goto nla_put_failure;
798 #ifdef CONFIG_NF_CONNTRACK_SECMARK
799 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
800 && ctnetlink_dump_secctx(skb, ct) < 0)
801 goto nla_put_failure;
803 if (events & (1 << IPCT_LABEL) &&
804 ctnetlink_dump_labels(skb, ct) < 0)
805 goto nla_put_failure;
807 if (events & (1 << IPCT_RELATED) &&
808 ctnetlink_dump_master(skb, ct) < 0)
809 goto nla_put_failure;
811 if (events & (1 << IPCT_SEQADJ) &&
812 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
813 goto nla_put_failure;
815 if (events & (1 << IPCT_SYNPROXY) &&
816 ctnetlink_dump_ct_synproxy(skb, ct) < 0)
817 goto nla_put_failure;
820 #ifdef CONFIG_NF_CONNTRACK_MARK
821 if ((events & (1 << IPCT_MARK) || ct->mark)
822 && ctnetlink_dump_mark(skb, ct) < 0)
823 goto nla_put_failure;
826 err = nfnetlink_send(skb, net, item->portid, group, item->report,
828 if (err == -ENOBUFS || err == -EAGAIN)
834 nlmsg_cancel(skb, nlh);
838 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
843 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
845 static int ctnetlink_done(struct netlink_callback *cb)
848 nf_ct_put((struct nf_conn *)cb->args[1]);
853 struct ctnetlink_filter {
857 u_int32_t orig_flags;
858 u_int32_t reply_flags;
860 struct nf_conntrack_tuple orig;
861 struct nf_conntrack_tuple reply;
862 struct nf_conntrack_zone zone;
870 static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
871 [CTA_FILTER_ORIG_FLAGS] = { .type = NLA_U32 },
872 [CTA_FILTER_REPLY_FLAGS] = { .type = NLA_U32 },
875 static int ctnetlink_parse_filter(const struct nlattr *attr,
876 struct ctnetlink_filter *filter)
878 struct nlattr *tb[CTA_FILTER_MAX + 1];
881 ret = nla_parse_nested(tb, CTA_FILTER_MAX, attr, cta_filter_nla_policy,
886 if (tb[CTA_FILTER_ORIG_FLAGS]) {
887 filter->orig_flags = nla_get_u32(tb[CTA_FILTER_ORIG_FLAGS]);
888 if (filter->orig_flags & ~CTA_FILTER_F_ALL)
892 if (tb[CTA_FILTER_REPLY_FLAGS]) {
893 filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
894 if (filter->reply_flags & ~CTA_FILTER_F_ALL)
901 static int ctnetlink_parse_zone(const struct nlattr *attr,
902 struct nf_conntrack_zone *zone);
903 static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
904 struct nf_conntrack_tuple *tuple,
905 u32 type, u_int8_t l3num,
906 struct nf_conntrack_zone *zone,
909 /* applied on filters */
910 #define CTA_FILTER_F_CTA_MARK (1 << 0)
911 #define CTA_FILTER_F_CTA_MARK_MASK (1 << 1)
913 static struct ctnetlink_filter *
914 ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
916 struct ctnetlink_filter *filter;
919 #ifndef CONFIG_NF_CONNTRACK_MARK
920 if (cda[CTA_MARK] || cda[CTA_MARK_MASK])
921 return ERR_PTR(-EOPNOTSUPP);
924 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
926 return ERR_PTR(-ENOMEM);
928 filter->family = family;
930 #ifdef CONFIG_NF_CONNTRACK_MARK
932 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
933 filter->cta_flags |= CTA_FILTER_FLAG(CTA_MARK);
935 if (cda[CTA_MARK_MASK]) {
936 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
937 filter->cta_flags |= CTA_FILTER_FLAG(CTA_MARK_MASK);
939 filter->mark.mask = 0xffffffff;
941 } else if (cda[CTA_MARK_MASK]) {
946 if (!cda[CTA_FILTER])
949 err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
953 err = ctnetlink_parse_filter(cda[CTA_FILTER], filter);
957 if (filter->orig_flags) {
958 if (!cda[CTA_TUPLE_ORIG]) {
963 err = ctnetlink_parse_tuple_filter(cda, &filter->orig,
972 if (filter->reply_flags) {
973 if (!cda[CTA_TUPLE_REPLY]) {
978 err = ctnetlink_parse_tuple_filter(cda, &filter->reply,
997 static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
999 return family || cda[CTA_MARK] || cda[CTA_FILTER];
1002 static int ctnetlink_start(struct netlink_callback *cb)
1004 const struct nlattr * const *cda = cb->data;
1005 struct ctnetlink_filter *filter = NULL;
1006 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1007 u8 family = nfmsg->nfgen_family;
1009 if (ctnetlink_needs_filter(family, cda)) {
1010 filter = ctnetlink_alloc_filter(cda, family);
1012 return PTR_ERR(filter);
1019 static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
1020 struct nf_conntrack_tuple *ct_tuple,
1021 u_int32_t flags, int family)
1025 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1026 filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
1029 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1030 filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
1034 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1035 !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
1036 &ct_tuple->src.u3.in6))
1039 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1040 !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
1041 &ct_tuple->dst.u3.in6))
1046 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
1047 filter_tuple->dst.protonum != ct_tuple->dst.protonum)
1050 switch (ct_tuple->dst.protonum) {
1053 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
1054 filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
1057 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
1058 filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
1062 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
1063 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1065 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
1066 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1068 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
1069 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1072 case IPPROTO_ICMPV6:
1073 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
1074 filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1076 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
1077 filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1079 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
1080 filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1088 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
1090 struct ctnetlink_filter *filter = data;
1091 struct nf_conntrack_tuple *tuple;
1096 /* Match entries of a given L3 protocol number.
1097 * If it is not specified, ie. l3proto == 0,
1098 * then match everything.
1100 if (filter->family && nf_ct_l3num(ct) != filter->family)
1103 if (filter->orig_flags) {
1104 tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
1105 if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
1111 if (filter->reply_flags) {
1112 tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
1113 if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
1114 filter->reply_flags,
1119 #ifdef CONFIG_NF_CONNTRACK_MARK
1120 if ((filter->cta_flags & CTA_FILTER_FLAG(CTA_MARK_MASK)) &&
1121 (ct->mark & filter->mark.mask) != filter->mark.val)
1123 else if ((filter->cta_flags & CTA_FILTER_FLAG(CTA_MARK)) &&
1124 ct->mark != filter->mark.val)
1136 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1138 unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
1139 struct net *net = sock_net(skb->sk);
1140 struct nf_conn *ct, *last;
1141 struct nf_conntrack_tuple_hash *h;
1142 struct hlist_nulls_node *n;
1143 struct nf_conn *nf_ct_evict[8];
1147 last = (struct nf_conn *)cb->args[1];
1151 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
1155 if (nf_ct_should_gc(nf_ct_evict[i]))
1156 nf_ct_kill(nf_ct_evict[i]);
1157 nf_ct_put(nf_ct_evict[i]);
1160 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
1161 nf_conntrack_lock(lockp);
1162 if (cb->args[0] >= nf_conntrack_htable_size) {
1166 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
1168 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
1170 ct = nf_ct_tuplehash_to_ctrack(h);
1171 if (nf_ct_is_expired(ct)) {
1172 if (i < ARRAY_SIZE(nf_ct_evict) &&
1173 atomic_inc_not_zero(&ct->ct_general.use))
1174 nf_ct_evict[i++] = ct;
1178 if (!net_eq(net, nf_ct_net(ct)))
1186 if (!ctnetlink_filter_match(ct, cb->data))
1190 ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1192 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1195 nf_conntrack_get(&ct->ct_general);
1196 cb->args[1] = (unsigned long)ct;
1210 /* nf ct hash resize happened, now clear the leftover. */
1211 if ((struct nf_conn *)cb->args[1] == last)
1219 if (nf_ct_should_gc(nf_ct_evict[i]))
1220 nf_ct_kill(nf_ct_evict[i]);
1221 nf_ct_put(nf_ct_evict[i]);
1227 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
1228 struct nf_conntrack_tuple *t,
1231 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1232 if (!tb[CTA_IP_V4_SRC])
1235 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1238 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1239 if (!tb[CTA_IP_V4_DST])
1242 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1248 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1249 struct nf_conntrack_tuple *t,
1252 if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1253 if (!tb[CTA_IP_V6_SRC])
1256 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1259 if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1260 if (!tb[CTA_IP_V6_DST])
1263 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1269 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1270 struct nf_conntrack_tuple *tuple,
1273 struct nlattr *tb[CTA_IP_MAX+1];
1276 ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
1280 ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
1281 cta_ip_nla_policy, NULL);
1285 switch (tuple->src.l3num) {
1287 ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
1290 ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
1297 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1298 [CTA_PROTO_NUM] = { .type = NLA_U8 },
1301 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1302 struct nf_conntrack_tuple *tuple,
1305 const struct nf_conntrack_l4proto *l4proto;
1306 struct nlattr *tb[CTA_PROTO_MAX+1];
1309 ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1310 proto_nla_policy, NULL);
1314 if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
1317 if (!tb[CTA_PROTO_NUM])
1320 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1323 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1325 if (likely(l4proto->nlattr_to_tuple)) {
1326 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1327 l4proto->nla_policy,
1330 ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
1339 ctnetlink_parse_zone(const struct nlattr *attr,
1340 struct nf_conntrack_zone *zone)
1342 nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1343 NF_CT_DEFAULT_ZONE_DIR, 0);
1344 #ifdef CONFIG_NF_CONNTRACK_ZONES
1346 zone->id = ntohs(nla_get_be16(attr));
1355 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1356 struct nf_conntrack_zone *zone)
1360 if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1363 ret = ctnetlink_parse_zone(attr, zone);
1367 if (type == CTA_TUPLE_REPLY)
1368 zone->dir = NF_CT_ZONE_DIR_REPL;
1370 zone->dir = NF_CT_ZONE_DIR_ORIG;
1375 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1376 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
1377 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
1378 [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
1381 #define CTA_FILTER_F_ALL_CTA_PROTO \
1382 (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
1383 CTA_FILTER_F_CTA_PROTO_DST_PORT | \
1384 CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
1385 CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
1386 CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
1387 CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
1388 CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
1389 CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
1392 ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
1393 struct nf_conntrack_tuple *tuple, u32 type,
1394 u_int8_t l3num, struct nf_conntrack_zone *zone,
1397 struct nlattr *tb[CTA_TUPLE_MAX+1];
1400 memset(tuple, 0, sizeof(*tuple));
1402 err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1403 tuple_nla_policy, NULL);
1408 tuple->src.l3num = l3num;
1410 if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
1411 flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1412 if (!tb[CTA_TUPLE_IP])
1415 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
1420 if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
1421 if (!tb[CTA_TUPLE_PROTO])
1424 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
1427 } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
1428 /* Can't manage proto flags without a protonum */
1432 if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
1436 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1442 /* orig and expect tuples get DIR_ORIGINAL */
1443 if (type == CTA_TUPLE_REPLY)
1444 tuple->dst.dir = IP_CT_DIR_REPLY;
1446 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1452 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1453 struct nf_conntrack_tuple *tuple, u32 type,
1454 u_int8_t l3num, struct nf_conntrack_zone *zone)
1456 return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
1457 CTA_FILTER_FLAG(ALL));
1460 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1461 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
1462 .len = NF_CT_HELPER_NAME_LEN - 1 },
1465 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1466 struct nlattr **helpinfo)
1469 struct nlattr *tb[CTA_HELP_MAX+1];
1471 err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1472 help_nla_policy, NULL);
1476 if (!tb[CTA_HELP_NAME])
1479 *helper_name = nla_data(tb[CTA_HELP_NAME]);
1481 if (tb[CTA_HELP_INFO])
1482 *helpinfo = tb[CTA_HELP_INFO];
1487 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1488 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
1489 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
1490 [CTA_STATUS] = { .type = NLA_U32 },
1491 [CTA_PROTOINFO] = { .type = NLA_NESTED },
1492 [CTA_HELP] = { .type = NLA_NESTED },
1493 [CTA_NAT_SRC] = { .type = NLA_NESTED },
1494 [CTA_TIMEOUT] = { .type = NLA_U32 },
1495 [CTA_MARK] = { .type = NLA_U32 },
1496 [CTA_ID] = { .type = NLA_U32 },
1497 [CTA_NAT_DST] = { .type = NLA_NESTED },
1498 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
1499 [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
1500 [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1501 [CTA_ZONE] = { .type = NLA_U16 },
1502 [CTA_MARK_MASK] = { .type = NLA_U32 },
1503 [CTA_LABELS] = { .type = NLA_BINARY,
1504 .len = NF_CT_LABELS_MAX_SIZE },
1505 [CTA_LABELS_MASK] = { .type = NLA_BINARY,
1506 .len = NF_CT_LABELS_MAX_SIZE },
1507 [CTA_FILTER] = { .type = NLA_NESTED },
1510 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1512 if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1515 return ctnetlink_filter_match(ct, data);
1518 static int ctnetlink_flush_conntrack(struct net *net,
1519 const struct nlattr * const cda[],
1520 u32 portid, int report, u8 family)
1522 struct ctnetlink_filter *filter = NULL;
1524 if (ctnetlink_needs_filter(family, cda)) {
1525 if (cda[CTA_FILTER])
1528 filter = ctnetlink_alloc_filter(cda, family);
1530 return PTR_ERR(filter);
1533 nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
1540 static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1541 struct sk_buff *skb,
1542 const struct nlmsghdr *nlh,
1543 const struct nlattr * const cda[],
1544 struct netlink_ext_ack *extack)
1546 struct nf_conntrack_tuple_hash *h;
1547 struct nf_conntrack_tuple tuple;
1549 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1550 struct nf_conntrack_zone zone;
1553 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1557 if (cda[CTA_TUPLE_ORIG])
1558 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1559 nfmsg->nfgen_family, &zone);
1560 else if (cda[CTA_TUPLE_REPLY])
1561 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1562 nfmsg->nfgen_family, &zone);
1564 u_int8_t u3 = nfmsg->version ? nfmsg->nfgen_family : AF_UNSPEC;
1566 return ctnetlink_flush_conntrack(net, cda,
1567 NETLINK_CB(skb).portid,
1568 nlmsg_report(nlh), u3);
1574 h = nf_conntrack_find_get(net, &zone, &tuple);
1578 ct = nf_ct_tuplehash_to_ctrack(h);
1580 if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1586 __be32 id = nla_get_be32(cda[CTA_ID]);
1588 if (id != (__force __be32)nf_ct_get_id(ct)) {
1594 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1600 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1601 struct sk_buff *skb,
1602 const struct nlmsghdr *nlh,
1603 const struct nlattr * const cda[],
1604 struct netlink_ext_ack *extack)
1606 struct nf_conntrack_tuple_hash *h;
1607 struct nf_conntrack_tuple tuple;
1609 struct sk_buff *skb2 = NULL;
1610 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1611 u_int8_t u3 = nfmsg->nfgen_family;
1612 struct nf_conntrack_zone zone;
1615 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1616 struct netlink_dump_control c = {
1617 .start = ctnetlink_start,
1618 .dump = ctnetlink_dump_table,
1619 .done = ctnetlink_done,
1620 .data = (void *)cda,
1623 return netlink_dump_start(ctnl, skb, nlh, &c);
1626 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1630 if (cda[CTA_TUPLE_ORIG])
1631 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1633 else if (cda[CTA_TUPLE_REPLY])
1634 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1642 h = nf_conntrack_find_get(net, &zone, &tuple);
1646 ct = nf_ct_tuplehash_to_ctrack(h);
1649 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1655 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1656 NFNL_MSG_TYPE(nlh->nlmsg_type), ct, true, 0);
1661 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1670 /* this avoids a loop in nfnetlink. */
1671 return err == -EAGAIN ? -ENOBUFS : err;
1674 static int ctnetlink_done_list(struct netlink_callback *cb)
1677 nf_ct_put((struct nf_conn *)cb->args[1]);
1682 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1684 struct nf_conn *ct, *last;
1685 struct nf_conntrack_tuple_hash *h;
1686 struct hlist_nulls_node *n;
1687 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1688 u_int8_t l3proto = nfmsg->nfgen_family;
1691 struct hlist_nulls_head *list;
1692 struct net *net = sock_net(skb->sk);
1697 last = (struct nf_conn *)cb->args[1];
1699 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1700 struct ct_pcpu *pcpu;
1702 if (!cpu_possible(cpu))
1705 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1706 spin_lock_bh(&pcpu->lock);
1707 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1709 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1710 ct = nf_ct_tuplehash_to_ctrack(h);
1711 if (l3proto && nf_ct_l3num(ct) != l3proto)
1719 /* We can't dump extension info for the unconfirmed
1720 * list because unconfirmed conntracks can have
1721 * ct->ext reallocated (and thus freed).
1723 * In the dying list case ct->ext can't be free'd
1724 * until after we drop pcpu->lock.
1726 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1728 NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1729 ct, dying ? true : false, 0);
1731 if (!atomic_inc_not_zero(&ct->ct_general.use))
1734 cb->args[1] = (unsigned long)ct;
1735 spin_unlock_bh(&pcpu->lock);
1743 spin_unlock_bh(&pcpu->lock);
1754 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1756 return ctnetlink_dump_list(skb, cb, true);
1759 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1760 struct sk_buff *skb,
1761 const struct nlmsghdr *nlh,
1762 const struct nlattr * const cda[],
1763 struct netlink_ext_ack *extack)
1765 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1766 struct netlink_dump_control c = {
1767 .dump = ctnetlink_dump_dying,
1768 .done = ctnetlink_done_list,
1770 return netlink_dump_start(ctnl, skb, nlh, &c);
1777 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1779 return ctnetlink_dump_list(skb, cb, false);
1782 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1783 struct sk_buff *skb,
1784 const struct nlmsghdr *nlh,
1785 const struct nlattr * const cda[],
1786 struct netlink_ext_ack *extack)
1788 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1789 struct netlink_dump_control c = {
1790 .dump = ctnetlink_dump_unconfirmed,
1791 .done = ctnetlink_done_list,
1793 return netlink_dump_start(ctnl, skb, nlh, &c);
1799 #if IS_ENABLED(CONFIG_NF_NAT)
1801 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1802 enum nf_nat_manip_type manip,
1803 const struct nlattr *attr)
1806 struct nf_nat_hook *nat_hook;
1809 nat_hook = rcu_dereference(nf_nat_hook);
1811 #ifdef CONFIG_MODULES
1813 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1814 if (request_module("nf-nat") < 0) {
1815 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1819 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1821 nat_hook = rcu_dereference(nf_nat_hook);
1828 err = nat_hook->parse_nat_setup(ct, manip, attr);
1829 if (err == -EAGAIN) {
1830 #ifdef CONFIG_MODULES
1832 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1833 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1834 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1838 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1849 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1854 /* Ignore these unchangable bits */
1855 on &= ~IPS_UNCHANGEABLE_MASK;
1856 off &= ~IPS_UNCHANGEABLE_MASK;
1858 for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1859 if (on & (1 << bit))
1860 set_bit(bit, &ct->status);
1861 else if (off & (1 << bit))
1862 clear_bit(bit, &ct->status);
1867 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1870 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1871 d = ct->status ^ status;
1873 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1877 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1878 /* SEEN_REPLY bit can only be set */
1881 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1882 /* ASSURED bit can only be set */
1885 __ctnetlink_change_status(ct, status, 0);
1890 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1892 #if IS_ENABLED(CONFIG_NF_NAT)
1895 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1898 ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1903 return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1906 if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1912 static int ctnetlink_change_helper(struct nf_conn *ct,
1913 const struct nlattr * const cda[])
1915 struct nf_conntrack_helper *helper;
1916 struct nf_conn_help *help = nfct_help(ct);
1917 char *helpname = NULL;
1918 struct nlattr *helpinfo = NULL;
1921 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1925 /* don't change helper of sibling connections */
1927 /* If we try to change the helper to the same thing twice,
1928 * treat the second attempt as a no-op instead of returning
1934 helper = rcu_dereference(help->helper);
1935 if (helper && !strcmp(helper->name, helpname))
1943 if (!strcmp(helpname, "")) {
1944 if (help && help->helper) {
1945 /* we had a helper before ... */
1946 nf_ct_remove_expectations(ct);
1947 RCU_INIT_POINTER(help->helper, NULL);
1954 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1955 nf_ct_protonum(ct));
1956 if (helper == NULL) {
1962 if (help->helper == helper) {
1963 /* update private helper data if allowed. */
1964 if (helper->from_nlattr)
1965 helper->from_nlattr(helpinfo, ct);
1970 /* we cannot set a helper for an existing conntrack */
1978 static int ctnetlink_change_timeout(struct nf_conn *ct,
1979 const struct nlattr * const cda[])
1981 u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1983 if (timeout > INT_MAX)
1985 ct->timeout = nfct_time_stamp + (u32)timeout;
1987 if (test_bit(IPS_DYING_BIT, &ct->status))
1993 #if defined(CONFIG_NF_CONNTRACK_MARK)
1994 static void ctnetlink_change_mark(struct nf_conn *ct,
1995 const struct nlattr * const cda[])
1997 u32 mark, newmark, mask = 0;
1999 if (cda[CTA_MARK_MASK])
2000 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2002 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2003 newmark = (ct->mark & mask) ^ mark;
2004 if (newmark != ct->mark)
2009 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
2010 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
2011 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
2012 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
2015 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
2016 const struct nlattr * const cda[])
2018 const struct nlattr *attr = cda[CTA_PROTOINFO];
2019 const struct nf_conntrack_l4proto *l4proto;
2020 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
2023 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
2024 protoinfo_policy, NULL);
2028 l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
2029 if (l4proto->from_nlattr)
2030 err = l4proto->from_nlattr(tb, ct);
2035 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
2036 [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
2037 [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
2038 [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
2041 static int change_seq_adj(struct nf_ct_seqadj *seq,
2042 const struct nlattr * const attr)
2045 struct nlattr *cda[CTA_SEQADJ_MAX+1];
2047 err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
2048 seqadj_policy, NULL);
2052 if (!cda[CTA_SEQADJ_CORRECTION_POS])
2055 seq->correction_pos =
2056 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
2058 if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
2061 seq->offset_before =
2062 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
2064 if (!cda[CTA_SEQADJ_OFFSET_AFTER])
2068 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
2074 ctnetlink_change_seq_adj(struct nf_conn *ct,
2075 const struct nlattr * const cda[])
2077 struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
2083 spin_lock_bh(&ct->lock);
2084 if (cda[CTA_SEQ_ADJ_ORIG]) {
2085 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
2086 cda[CTA_SEQ_ADJ_ORIG]);
2090 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2093 if (cda[CTA_SEQ_ADJ_REPLY]) {
2094 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
2095 cda[CTA_SEQ_ADJ_REPLY]);
2099 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2102 spin_unlock_bh(&ct->lock);
2105 spin_unlock_bh(&ct->lock);
2109 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
2110 [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
2111 [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
2112 [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
2115 static int ctnetlink_change_synproxy(struct nf_conn *ct,
2116 const struct nlattr * const cda[])
2118 struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
2119 struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
2125 err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
2126 cda[CTA_SYNPROXY], synproxy_policy,
2131 if (!tb[CTA_SYNPROXY_ISN] ||
2132 !tb[CTA_SYNPROXY_ITS] ||
2133 !tb[CTA_SYNPROXY_TSOFF])
2136 synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
2137 synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
2138 synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
2144 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
2146 #ifdef CONFIG_NF_CONNTRACK_LABELS
2147 size_t len = nla_len(cda[CTA_LABELS]);
2148 const void *mask = cda[CTA_LABELS_MASK];
2150 if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
2154 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
2155 nla_len(cda[CTA_LABELS_MASK]) != len)
2157 mask = nla_data(cda[CTA_LABELS_MASK]);
2162 return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
2169 ctnetlink_change_conntrack(struct nf_conn *ct,
2170 const struct nlattr * const cda[])
2174 /* only allow NAT changes and master assignation for new conntracks */
2175 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
2178 if (cda[CTA_HELP]) {
2179 err = ctnetlink_change_helper(ct, cda);
2184 if (cda[CTA_TIMEOUT]) {
2185 err = ctnetlink_change_timeout(ct, cda);
2190 if (cda[CTA_STATUS]) {
2191 err = ctnetlink_change_status(ct, cda);
2196 if (cda[CTA_PROTOINFO]) {
2197 err = ctnetlink_change_protoinfo(ct, cda);
2202 #if defined(CONFIG_NF_CONNTRACK_MARK)
2204 ctnetlink_change_mark(ct, cda);
2207 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2208 err = ctnetlink_change_seq_adj(ct, cda);
2213 if (cda[CTA_SYNPROXY]) {
2214 err = ctnetlink_change_synproxy(ct, cda);
2219 if (cda[CTA_LABELS]) {
2220 err = ctnetlink_attach_labels(ct, cda);
2228 static struct nf_conn *
2229 ctnetlink_create_conntrack(struct net *net,
2230 const struct nf_conntrack_zone *zone,
2231 const struct nlattr * const cda[],
2232 struct nf_conntrack_tuple *otuple,
2233 struct nf_conntrack_tuple *rtuple,
2238 struct nf_conntrack_helper *helper;
2239 struct nf_conn_tstamp *tstamp;
2242 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
2244 return ERR_PTR(-ENOMEM);
2246 if (!cda[CTA_TIMEOUT])
2249 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2250 if (timeout > INT_MAX)
2252 ct->timeout = (u32)timeout + nfct_time_stamp;
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 /* not in hash table yet so not strictly necessary */
2298 RCU_INIT_POINTER(help->helper, helper);
2301 /* try an implicit helper assignation */
2302 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
2307 err = ctnetlink_setup_nat(ct, cda);
2311 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2312 nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2313 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2314 nf_ct_labels_ext_add(ct);
2315 nfct_seqadj_ext_add(ct);
2316 nfct_synproxy_ext_add(ct);
2318 /* we must add conntrack extensions before confirmation. */
2319 ct->status |= IPS_CONFIRMED;
2321 if (cda[CTA_STATUS]) {
2322 err = ctnetlink_change_status(ct, cda);
2327 if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2328 err = ctnetlink_change_seq_adj(ct, cda);
2333 memset(&ct->proto, 0, sizeof(ct->proto));
2334 if (cda[CTA_PROTOINFO]) {
2335 err = ctnetlink_change_protoinfo(ct, cda);
2340 if (cda[CTA_SYNPROXY]) {
2341 err = ctnetlink_change_synproxy(ct, cda);
2346 #if defined(CONFIG_NF_CONNTRACK_MARK)
2348 ctnetlink_change_mark(ct, cda);
2351 /* setup master conntrack: this is a confirmed expectation */
2352 if (cda[CTA_TUPLE_MASTER]) {
2353 struct nf_conntrack_tuple master;
2354 struct nf_conntrack_tuple_hash *master_h;
2355 struct nf_conn *master_ct;
2357 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2362 master_h = nf_conntrack_find_get(net, zone, &master);
2363 if (master_h == NULL) {
2367 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2368 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2369 ct->master = master_ct;
2371 tstamp = nf_conn_tstamp_find(ct);
2373 tstamp->start = ktime_get_real_ns();
2375 err = nf_conntrack_hash_check_insert(ct);
2386 nf_conntrack_free(ct);
2387 return ERR_PTR(err);
2390 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
2391 struct sk_buff *skb,
2392 const struct nlmsghdr *nlh,
2393 const struct nlattr * const cda[],
2394 struct netlink_ext_ack *extack)
2396 struct nf_conntrack_tuple otuple, rtuple;
2397 struct nf_conntrack_tuple_hash *h = NULL;
2398 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2400 u_int8_t u3 = nfmsg->nfgen_family;
2401 struct nf_conntrack_zone zone;
2404 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2408 if (cda[CTA_TUPLE_ORIG]) {
2409 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2415 if (cda[CTA_TUPLE_REPLY]) {
2416 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2422 if (cda[CTA_TUPLE_ORIG])
2423 h = nf_conntrack_find_get(net, &zone, &otuple);
2424 else if (cda[CTA_TUPLE_REPLY])
2425 h = nf_conntrack_find_get(net, &zone, &rtuple);
2429 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2430 enum ip_conntrack_events events;
2432 if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2434 if (otuple.dst.protonum != rtuple.dst.protonum)
2437 ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
2443 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2444 events = 1 << IPCT_RELATED;
2446 events = 1 << IPCT_NEW;
2448 if (cda[CTA_LABELS] &&
2449 ctnetlink_attach_labels(ct, cda) == 0)
2450 events |= (1 << IPCT_LABEL);
2452 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2453 (1 << IPCT_ASSURED) |
2454 (1 << IPCT_HELPER) |
2455 (1 << IPCT_PROTOINFO) |
2456 (1 << IPCT_SEQADJ) |
2458 (1 << IPCT_SYNPROXY) |
2460 ct, NETLINK_CB(skb).portid,
2467 /* implicit 'else' */
2470 ct = nf_ct_tuplehash_to_ctrack(h);
2471 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
2472 err = ctnetlink_change_conntrack(ct, cda);
2474 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2475 (1 << IPCT_ASSURED) |
2476 (1 << IPCT_HELPER) |
2478 (1 << IPCT_PROTOINFO) |
2479 (1 << IPCT_SEQADJ) |
2481 (1 << IPCT_SYNPROXY),
2482 ct, NETLINK_CB(skb).portid,
2492 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2493 __u16 cpu, const struct ip_conntrack_stat *st)
2495 struct nlmsghdr *nlh;
2496 struct nfgenmsg *nfmsg;
2497 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2499 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2500 IPCTNL_MSG_CT_GET_STATS_CPU);
2501 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2505 nfmsg = nlmsg_data(nlh);
2506 nfmsg->nfgen_family = AF_UNSPEC;
2507 nfmsg->version = NFNETLINK_V0;
2508 nfmsg->res_id = htons(cpu);
2510 if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2511 nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2512 nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
2513 nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2514 nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2515 htonl(st->insert_failed)) ||
2516 nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2517 nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2518 nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2519 nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2520 htonl(st->search_restart)))
2521 goto nla_put_failure;
2523 nlmsg_end(skb, nlh);
2528 nlmsg_cancel(skb, nlh);
2533 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2536 struct net *net = sock_net(skb->sk);
2538 if (cb->args[0] == nr_cpu_ids)
2541 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2542 const struct ip_conntrack_stat *st;
2544 if (!cpu_possible(cpu))
2547 st = per_cpu_ptr(net->ct.stat, cpu);
2548 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2549 NETLINK_CB(cb->skb).portid,
2559 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2560 struct sk_buff *skb,
2561 const struct nlmsghdr *nlh,
2562 const struct nlattr * const cda[],
2563 struct netlink_ext_ack *extack)
2565 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2566 struct netlink_dump_control c = {
2567 .dump = ctnetlink_ct_stat_cpu_dump,
2569 return netlink_dump_start(ctnl, skb, nlh, &c);
2576 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2579 struct nlmsghdr *nlh;
2580 struct nfgenmsg *nfmsg;
2581 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2582 unsigned int nr_conntracks = atomic_read(&net->ct.count);
2584 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2585 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2589 nfmsg = nlmsg_data(nlh);
2590 nfmsg->nfgen_family = AF_UNSPEC;
2591 nfmsg->version = NFNETLINK_V0;
2594 if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2595 goto nla_put_failure;
2597 if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2598 goto nla_put_failure;
2600 nlmsg_end(skb, nlh);
2605 nlmsg_cancel(skb, nlh);
2609 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2610 struct sk_buff *skb, const struct nlmsghdr *nlh,
2611 const struct nlattr * const cda[],
2612 struct netlink_ext_ack *extack)
2614 struct sk_buff *skb2;
2617 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2621 err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2623 NFNL_MSG_TYPE(nlh->nlmsg_type),
2628 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2637 /* this avoids a loop in nfnetlink. */
2638 return err == -EAGAIN ? -ENOBUFS : err;
2641 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2642 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
2643 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
2644 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
2645 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
2646 [CTA_EXPECT_ID] = { .type = NLA_U32 },
2647 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
2648 .len = NF_CT_HELPER_NAME_LEN - 1 },
2649 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
2650 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
2651 [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
2652 [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
2653 [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
2656 static struct nf_conntrack_expect *
2657 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2658 struct nf_conntrack_helper *helper,
2659 struct nf_conntrack_tuple *tuple,
2660 struct nf_conntrack_tuple *mask);
2662 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2664 ctnetlink_glue_build_size(const struct nf_conn *ct)
2666 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2667 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2668 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2669 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2670 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2671 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2672 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2673 + nla_total_size(0) /* CTA_PROTOINFO */
2674 + nla_total_size(0) /* CTA_HELP */
2675 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2676 + ctnetlink_secctx_size(ct)
2677 #if IS_ENABLED(CONFIG_NF_NAT)
2678 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2679 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2681 #ifdef CONFIG_NF_CONNTRACK_MARK
2682 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2684 #ifdef CONFIG_NF_CONNTRACK_ZONES
2685 + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2687 + ctnetlink_proto_size(ct)
2691 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2692 enum ip_conntrack_info *ctinfo)
2694 return nf_ct_get(skb, ctinfo);
2697 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2699 const struct nf_conntrack_zone *zone;
2700 struct nlattr *nest_parms;
2702 zone = nf_ct_zone(ct);
2704 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2706 goto nla_put_failure;
2707 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2708 goto nla_put_failure;
2709 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2710 NF_CT_ZONE_DIR_ORIG) < 0)
2711 goto nla_put_failure;
2712 nla_nest_end(skb, nest_parms);
2714 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2716 goto nla_put_failure;
2717 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2718 goto nla_put_failure;
2719 if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2720 NF_CT_ZONE_DIR_REPL) < 0)
2721 goto nla_put_failure;
2722 nla_nest_end(skb, nest_parms);
2724 if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2725 NF_CT_DEFAULT_ZONE_DIR) < 0)
2726 goto nla_put_failure;
2728 if (ctnetlink_dump_id(skb, ct) < 0)
2729 goto nla_put_failure;
2731 if (ctnetlink_dump_status(skb, ct) < 0)
2732 goto nla_put_failure;
2734 if (ctnetlink_dump_timeout(skb, ct) < 0)
2735 goto nla_put_failure;
2737 if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2738 goto nla_put_failure;
2740 if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2741 goto nla_put_failure;
2743 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2744 if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2745 goto nla_put_failure;
2747 if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2748 goto nla_put_failure;
2750 if ((ct->status & IPS_SEQ_ADJUST) &&
2751 ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2752 goto nla_put_failure;
2754 if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2755 goto nla_put_failure;
2757 #ifdef CONFIG_NF_CONNTRACK_MARK
2758 if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2759 goto nla_put_failure;
2761 if (ctnetlink_dump_labels(skb, ct) < 0)
2762 goto nla_put_failure;
2770 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2771 enum ip_conntrack_info ctinfo,
2772 u_int16_t ct_attr, u_int16_t ct_info_attr)
2774 struct nlattr *nest_parms;
2776 nest_parms = nla_nest_start(skb, ct_attr);
2778 goto nla_put_failure;
2780 if (__ctnetlink_glue_build(skb, ct) < 0)
2781 goto nla_put_failure;
2783 nla_nest_end(skb, nest_parms);
2785 if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2786 goto nla_put_failure;
2795 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2797 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2798 unsigned long d = ct->status ^ status;
2800 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2801 /* SEEN_REPLY bit can only be set */
2804 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2805 /* ASSURED bit can only be set */
2808 /* This check is less strict than ctnetlink_change_status()
2809 * because callers often flip IPS_EXPECTED bits when sending
2810 * an NFQA_CT attribute to the kernel. So ignore the
2811 * unchangeable bits but do not error out. Also user programs
2812 * are allowed to clear the bits that they are allowed to change.
2814 __ctnetlink_change_status(ct, status, ~status);
2819 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2823 if (cda[CTA_TIMEOUT]) {
2824 err = ctnetlink_change_timeout(ct, cda);
2828 if (cda[CTA_STATUS]) {
2829 err = ctnetlink_update_status(ct, cda);
2833 if (cda[CTA_HELP]) {
2834 err = ctnetlink_change_helper(ct, cda);
2838 if (cda[CTA_LABELS]) {
2839 err = ctnetlink_attach_labels(ct, cda);
2843 #if defined(CONFIG_NF_CONNTRACK_MARK)
2844 if (cda[CTA_MARK]) {
2845 ctnetlink_change_mark(ct, cda);
2852 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2854 struct nlattr *cda[CTA_MAX+1];
2857 ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2862 return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2865 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2866 const struct nf_conn *ct,
2867 struct nf_conntrack_tuple *tuple,
2868 struct nf_conntrack_tuple *mask)
2872 err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2873 nf_ct_l3num(ct), NULL);
2877 return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2878 nf_ct_l3num(ct), NULL);
2882 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2883 u32 portid, u32 report)
2885 struct nlattr *cda[CTA_EXPECT_MAX+1];
2886 struct nf_conntrack_tuple tuple, mask;
2887 struct nf_conntrack_helper *helper = NULL;
2888 struct nf_conntrack_expect *exp;
2891 err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2892 exp_nla_policy, NULL);
2896 err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2901 if (cda[CTA_EXPECT_HELP_NAME]) {
2902 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2904 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2905 nf_ct_protonum(ct));
2910 exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2911 helper, &tuple, &mask);
2913 return PTR_ERR(exp);
2915 err = nf_ct_expect_related_report(exp, portid, report, 0);
2916 nf_ct_expect_put(exp);
2920 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2921 enum ip_conntrack_info ctinfo, int diff)
2923 if (!(ct->status & IPS_NAT_MASK))
2926 nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2929 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2930 .get_ct = ctnetlink_glue_get_ct,
2931 .build_size = ctnetlink_glue_build_size,
2932 .build = ctnetlink_glue_build,
2933 .parse = ctnetlink_glue_parse,
2934 .attach_expect = ctnetlink_glue_attach_expect,
2935 .seq_adjust = ctnetlink_glue_seqadj,
2937 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2939 /***********************************************************************
2941 ***********************************************************************/
2943 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2944 const struct nf_conntrack_tuple *tuple,
2947 struct nlattr *nest_parms;
2949 nest_parms = nla_nest_start(skb, type);
2951 goto nla_put_failure;
2952 if (ctnetlink_dump_tuples(skb, tuple) < 0)
2953 goto nla_put_failure;
2954 nla_nest_end(skb, nest_parms);
2962 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2963 const struct nf_conntrack_tuple *tuple,
2964 const struct nf_conntrack_tuple_mask *mask)
2966 const struct nf_conntrack_l4proto *l4proto;
2967 struct nf_conntrack_tuple m;
2968 struct nlattr *nest_parms;
2971 memset(&m, 0xFF, sizeof(m));
2972 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2973 m.src.u.all = mask->src.u.all;
2974 m.dst.protonum = tuple->dst.protonum;
2976 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2978 goto nla_put_failure;
2981 ret = ctnetlink_dump_tuples_ip(skb, &m);
2983 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2984 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2988 if (unlikely(ret < 0))
2989 goto nla_put_failure;
2991 nla_nest_end(skb, nest_parms);
2999 static const union nf_inet_addr any_addr;
3001 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
3003 static __read_mostly siphash_key_t exp_id_seed;
3004 unsigned long a, b, c, d;
3006 net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
3008 a = (unsigned long)exp;
3009 b = (unsigned long)exp->helper;
3010 c = (unsigned long)exp->master;
3011 d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
3014 return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
3016 return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
3021 ctnetlink_exp_dump_expect(struct sk_buff *skb,
3022 const struct nf_conntrack_expect *exp)
3024 struct nf_conn *master = exp->master;
3025 long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
3026 struct nf_conn_help *help;
3027 #if IS_ENABLED(CONFIG_NF_NAT)
3028 struct nlattr *nest_parms;
3029 struct nf_conntrack_tuple nat_tuple = {};
3031 struct nf_ct_helper_expectfn *expfn;
3036 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
3037 goto nla_put_failure;
3038 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
3039 goto nla_put_failure;
3040 if (ctnetlink_exp_dump_tuple(skb,
3041 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
3042 CTA_EXPECT_MASTER) < 0)
3043 goto nla_put_failure;
3045 #if IS_ENABLED(CONFIG_NF_NAT)
3046 if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
3047 exp->saved_proto.all) {
3048 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
3050 goto nla_put_failure;
3052 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
3053 goto nla_put_failure;
3055 nat_tuple.src.l3num = nf_ct_l3num(master);
3056 nat_tuple.src.u3 = exp->saved_addr;
3057 nat_tuple.dst.protonum = nf_ct_protonum(master);
3058 nat_tuple.src.u = exp->saved_proto;
3060 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
3061 CTA_EXPECT_NAT_TUPLE) < 0)
3062 goto nla_put_failure;
3063 nla_nest_end(skb, nest_parms);
3066 if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
3067 nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
3068 nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
3069 nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
3070 goto nla_put_failure;
3071 help = nfct_help(master);
3073 struct nf_conntrack_helper *helper;
3075 helper = rcu_dereference(help->helper);
3077 nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
3078 goto nla_put_failure;
3080 expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
3081 if (expfn != NULL &&
3082 nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
3083 goto nla_put_failure;
3092 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
3093 int event, const struct nf_conntrack_expect *exp)
3095 struct nlmsghdr *nlh;
3096 struct nfgenmsg *nfmsg;
3097 unsigned int flags = portid ? NLM_F_MULTI : 0;
3099 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
3100 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3104 nfmsg = nlmsg_data(nlh);
3105 nfmsg->nfgen_family = exp->tuple.src.l3num;
3106 nfmsg->version = NFNETLINK_V0;
3109 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3110 goto nla_put_failure;
3112 nlmsg_end(skb, nlh);
3117 nlmsg_cancel(skb, nlh);
3121 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3123 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
3125 struct nf_conntrack_expect *exp = item->exp;
3126 struct net *net = nf_ct_exp_net(exp);
3127 struct nlmsghdr *nlh;
3128 struct nfgenmsg *nfmsg;
3129 struct sk_buff *skb;
3130 unsigned int type, group;
3133 if (events & (1 << IPEXP_DESTROY)) {
3134 type = IPCTNL_MSG_EXP_DELETE;
3135 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
3136 } else if (events & (1 << IPEXP_NEW)) {
3137 type = IPCTNL_MSG_EXP_NEW;
3138 flags = NLM_F_CREATE|NLM_F_EXCL;
3139 group = NFNLGRP_CONNTRACK_EXP_NEW;
3143 if (!item->report && !nfnetlink_has_listeners(net, group))
3146 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
3150 type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
3151 nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
3155 nfmsg = nlmsg_data(nlh);
3156 nfmsg->nfgen_family = exp->tuple.src.l3num;
3157 nfmsg->version = NFNETLINK_V0;
3160 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3161 goto nla_put_failure;
3163 nlmsg_end(skb, nlh);
3164 nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
3168 nlmsg_cancel(skb, nlh);
3172 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
3176 static int ctnetlink_exp_done(struct netlink_callback *cb)
3179 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
3184 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3186 struct net *net = sock_net(skb->sk);
3187 struct nf_conntrack_expect *exp, *last;
3188 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3189 u_int8_t l3proto = nfmsg->nfgen_family;
3192 last = (struct nf_conntrack_expect *)cb->args[1];
3193 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
3195 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
3197 if (l3proto && exp->tuple.src.l3num != l3proto)
3200 if (!net_eq(nf_ct_net(exp->master), net))
3208 if (ctnetlink_exp_fill_info(skb,
3209 NETLINK_CB(cb->skb).portid,
3213 if (!refcount_inc_not_zero(&exp->use))
3215 cb->args[1] = (unsigned long)exp;
3227 nf_ct_expect_put(last);
3233 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3235 struct nf_conntrack_expect *exp, *last;
3236 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3237 struct nf_conn *ct = cb->data;
3238 struct nf_conn_help *help = nfct_help(ct);
3239 u_int8_t l3proto = nfmsg->nfgen_family;
3245 last = (struct nf_conntrack_expect *)cb->args[1];
3247 hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
3248 if (l3proto && exp->tuple.src.l3num != l3proto)
3255 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
3259 if (!refcount_inc_not_zero(&exp->use))
3261 cb->args[1] = (unsigned long)exp;
3273 nf_ct_expect_put(last);
3278 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
3279 struct sk_buff *skb,
3280 const struct nlmsghdr *nlh,
3281 const struct nlattr * const cda[],
3282 struct netlink_ext_ack *extack)
3285 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3286 u_int8_t u3 = nfmsg->nfgen_family;
3287 struct nf_conntrack_tuple tuple;
3288 struct nf_conntrack_tuple_hash *h;
3290 struct nf_conntrack_zone zone;
3291 struct netlink_dump_control c = {
3292 .dump = ctnetlink_exp_ct_dump_table,
3293 .done = ctnetlink_exp_done,
3296 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3301 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3305 h = nf_conntrack_find_get(net, &zone, &tuple);
3309 ct = nf_ct_tuplehash_to_ctrack(h);
3310 /* No expectation linked to this connection tracking. */
3311 if (!nfct_help(ct)) {
3318 err = netlink_dump_start(ctnl, skb, nlh, &c);
3324 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
3325 struct sk_buff *skb, const struct nlmsghdr *nlh,
3326 const struct nlattr * const cda[],
3327 struct netlink_ext_ack *extack)
3329 struct nf_conntrack_tuple tuple;
3330 struct nf_conntrack_expect *exp;
3331 struct sk_buff *skb2;
3332 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3333 u_int8_t u3 = nfmsg->nfgen_family;
3334 struct nf_conntrack_zone zone;
3337 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3338 if (cda[CTA_EXPECT_MASTER])
3339 return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda,
3342 struct netlink_dump_control c = {
3343 .dump = ctnetlink_exp_dump_table,
3344 .done = ctnetlink_exp_done,
3346 return netlink_dump_start(ctnl, skb, nlh, &c);
3350 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3354 if (cda[CTA_EXPECT_TUPLE])
3355 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3357 else if (cda[CTA_EXPECT_MASTER])
3358 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3366 exp = nf_ct_expect_find_get(net, &zone, &tuple);
3370 if (cda[CTA_EXPECT_ID]) {
3371 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3373 if (id != nf_expect_get_id(exp)) {
3374 nf_ct_expect_put(exp);
3380 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3382 nf_ct_expect_put(exp);
3387 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3388 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
3390 nf_ct_expect_put(exp);
3394 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
3403 /* this avoids a loop in nfnetlink. */
3404 return err == -EAGAIN ? -ENOBUFS : err;
3407 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3409 const struct nf_conn_help *m_help;
3410 const char *name = data;
3412 m_help = nfct_help(exp->master);
3414 return strcmp(m_help->helper->name, name) == 0;
3417 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3422 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
3423 struct sk_buff *skb, const struct nlmsghdr *nlh,
3424 const struct nlattr * const cda[],
3425 struct netlink_ext_ack *extack)
3427 struct nf_conntrack_expect *exp;
3428 struct nf_conntrack_tuple tuple;
3429 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3430 u_int8_t u3 = nfmsg->nfgen_family;
3431 struct nf_conntrack_zone zone;
3434 if (cda[CTA_EXPECT_TUPLE]) {
3435 /* delete a single expect by tuple */
3436 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3440 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3445 /* bump usage count to 2 */
3446 exp = nf_ct_expect_find_get(net, &zone, &tuple);
3450 if (cda[CTA_EXPECT_ID]) {
3451 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3452 if (ntohl(id) != (u32)(unsigned long)exp) {
3453 nf_ct_expect_put(exp);
3458 /* after list removal, usage count == 1 */
3459 spin_lock_bh(&nf_conntrack_expect_lock);
3460 if (del_timer(&exp->timeout)) {
3461 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3463 nf_ct_expect_put(exp);
3465 spin_unlock_bh(&nf_conntrack_expect_lock);
3466 /* have to put what we 'get' above.
3467 * after this line usage count == 0 */
3468 nf_ct_expect_put(exp);
3469 } else if (cda[CTA_EXPECT_HELP_NAME]) {
3470 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3472 nf_ct_expect_iterate_net(net, expect_iter_name, name,
3473 NETLINK_CB(skb).portid,
3476 /* This basically means we have to flush everything*/
3477 nf_ct_expect_iterate_net(net, expect_iter_all, NULL,
3478 NETLINK_CB(skb).portid,
3485 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3486 const struct nlattr * const cda[])
3488 if (cda[CTA_EXPECT_TIMEOUT]) {
3489 if (!del_timer(&x->timeout))
3492 x->timeout.expires = jiffies +
3493 ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3494 add_timer(&x->timeout);
3499 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3500 [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
3501 [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
3505 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3506 struct nf_conntrack_expect *exp,
3509 #if IS_ENABLED(CONFIG_NF_NAT)
3510 struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3511 struct nf_conntrack_tuple nat_tuple = {};
3514 err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3515 exp_nat_nla_policy, NULL);
3519 if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3522 err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3523 &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3528 exp->saved_addr = nat_tuple.src.u3;
3529 exp->saved_proto = nat_tuple.src.u;
3530 exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3538 static struct nf_conntrack_expect *
3539 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3540 struct nf_conntrack_helper *helper,
3541 struct nf_conntrack_tuple *tuple,
3542 struct nf_conntrack_tuple *mask)
3544 u_int32_t class = 0;
3545 struct nf_conntrack_expect *exp;
3546 struct nf_conn_help *help;
3549 help = nfct_help(ct);
3551 return ERR_PTR(-EOPNOTSUPP);
3553 if (cda[CTA_EXPECT_CLASS] && helper) {
3554 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3555 if (class > helper->expect_class_max)
3556 return ERR_PTR(-EINVAL);
3558 exp = nf_ct_expect_alloc(ct);
3560 return ERR_PTR(-ENOMEM);
3562 if (cda[CTA_EXPECT_FLAGS]) {
3563 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3564 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3568 if (cda[CTA_EXPECT_FN]) {
3569 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3570 struct nf_ct_helper_expectfn *expfn;
3572 expfn = nf_ct_helper_expectfn_find_by_name(name);
3573 if (expfn == NULL) {
3577 exp->expectfn = expfn->expectfn;
3579 exp->expectfn = NULL;
3583 exp->helper = helper;
3584 exp->tuple = *tuple;
3585 exp->mask.src.u3 = mask->src.u3;
3586 exp->mask.src.u.all = mask->src.u.all;
3588 if (cda[CTA_EXPECT_NAT]) {
3589 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3590 exp, nf_ct_l3num(ct));
3596 nf_ct_expect_put(exp);
3597 return ERR_PTR(err);
3601 ctnetlink_create_expect(struct net *net,
3602 const struct nf_conntrack_zone *zone,
3603 const struct nlattr * const cda[],
3604 u_int8_t u3, u32 portid, int report)
3606 struct nf_conntrack_tuple tuple, mask, master_tuple;
3607 struct nf_conntrack_tuple_hash *h = NULL;
3608 struct nf_conntrack_helper *helper = NULL;
3609 struct nf_conntrack_expect *exp;
3613 /* caller guarantees that those three CTA_EXPECT_* exist */
3614 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3618 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3622 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3627 /* Look for master conntrack of this expectation */
3628 h = nf_conntrack_find_get(net, zone, &master_tuple);
3631 ct = nf_ct_tuplehash_to_ctrack(h);
3634 if (cda[CTA_EXPECT_HELP_NAME]) {
3635 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3637 helper = __nf_conntrack_helper_find(helpname, u3,
3638 nf_ct_protonum(ct));
3639 if (helper == NULL) {
3641 #ifdef CONFIG_MODULES
3642 if (request_module("nfct-helper-%s", helpname) < 0) {
3647 helper = __nf_conntrack_helper_find(helpname, u3,
3648 nf_ct_protonum(ct));
3660 exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3666 err = nf_ct_expect_related_report(exp, portid, report, 0);
3667 nf_ct_expect_put(exp);
3675 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3676 struct sk_buff *skb, const struct nlmsghdr *nlh,
3677 const struct nlattr * const cda[],
3678 struct netlink_ext_ack *extack)
3680 struct nf_conntrack_tuple tuple;
3681 struct nf_conntrack_expect *exp;
3682 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3683 u_int8_t u3 = nfmsg->nfgen_family;
3684 struct nf_conntrack_zone zone;
3687 if (!cda[CTA_EXPECT_TUPLE]
3688 || !cda[CTA_EXPECT_MASK]
3689 || !cda[CTA_EXPECT_MASTER])
3692 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3696 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3701 spin_lock_bh(&nf_conntrack_expect_lock);
3702 exp = __nf_ct_expect_find(net, &zone, &tuple);
3704 spin_unlock_bh(&nf_conntrack_expect_lock);
3706 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3707 err = ctnetlink_create_expect(net, &zone, cda, u3,
3708 NETLINK_CB(skb).portid,
3715 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3716 err = ctnetlink_change_expect(exp, cda);
3717 spin_unlock_bh(&nf_conntrack_expect_lock);
3723 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3724 const struct ip_conntrack_stat *st)
3726 struct nlmsghdr *nlh;
3727 struct nfgenmsg *nfmsg;
3728 unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3730 event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3731 IPCTNL_MSG_EXP_GET_STATS_CPU);
3732 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3736 nfmsg = nlmsg_data(nlh);
3737 nfmsg->nfgen_family = AF_UNSPEC;
3738 nfmsg->version = NFNETLINK_V0;
3739 nfmsg->res_id = htons(cpu);
3741 if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3742 nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3743 nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3744 goto nla_put_failure;
3746 nlmsg_end(skb, nlh);
3751 nlmsg_cancel(skb, nlh);
3756 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3759 struct net *net = sock_net(skb->sk);
3761 if (cb->args[0] == nr_cpu_ids)
3764 for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3765 const struct ip_conntrack_stat *st;
3767 if (!cpu_possible(cpu))
3770 st = per_cpu_ptr(net->ct.stat, cpu);
3771 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3781 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3782 struct sk_buff *skb,
3783 const struct nlmsghdr *nlh,
3784 const struct nlattr * const cda[],
3785 struct netlink_ext_ack *extack)
3787 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3788 struct netlink_dump_control c = {
3789 .dump = ctnetlink_exp_stat_cpu_dump,
3791 return netlink_dump_start(ctnl, skb, nlh, &c);
3797 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3798 static struct nf_ct_event_notifier ctnl_notifier = {
3799 .fcn = ctnetlink_conntrack_event,
3802 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3803 .fcn = ctnetlink_expect_event,
3807 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3808 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
3809 .attr_count = CTA_MAX,
3810 .policy = ct_nla_policy },
3811 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
3812 .attr_count = CTA_MAX,
3813 .policy = ct_nla_policy },
3814 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
3815 .attr_count = CTA_MAX,
3816 .policy = ct_nla_policy },
3817 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
3818 .attr_count = CTA_MAX,
3819 .policy = ct_nla_policy },
3820 [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
3821 [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
3822 [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
3823 [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3826 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3827 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
3828 .attr_count = CTA_EXPECT_MAX,
3829 .policy = exp_nla_policy },
3830 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
3831 .attr_count = CTA_EXPECT_MAX,
3832 .policy = exp_nla_policy },
3833 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
3834 .attr_count = CTA_EXPECT_MAX,
3835 .policy = exp_nla_policy },
3836 [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
3839 static const struct nfnetlink_subsystem ctnl_subsys = {
3840 .name = "conntrack",
3841 .subsys_id = NFNL_SUBSYS_CTNETLINK,
3842 .cb_count = IPCTNL_MSG_MAX,
3846 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3847 .name = "conntrack_expect",
3848 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
3849 .cb_count = IPCTNL_MSG_EXP_MAX,
3853 MODULE_ALIAS("ip_conntrack_netlink");
3854 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3855 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3857 static int __net_init ctnetlink_net_init(struct net *net)
3859 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3862 ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3864 pr_err("ctnetlink_init: cannot register notifier.\n");
3868 ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3870 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3871 goto err_unreg_notifier;
3876 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3878 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3884 static void ctnetlink_net_exit(struct net *net)
3886 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3887 nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3888 nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3892 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3896 list_for_each_entry(net, net_exit_list, exit_list)
3897 ctnetlink_net_exit(net);
3899 /* wait for other cpus until they are done with ctnl_notifiers */
3903 static struct pernet_operations ctnetlink_net_ops = {
3904 .init = ctnetlink_net_init,
3905 .exit_batch = ctnetlink_net_exit_batch,
3908 static int __init ctnetlink_init(void)
3912 ret = nfnetlink_subsys_register(&ctnl_subsys);
3914 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3918 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3920 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3921 goto err_unreg_subsys;
3924 ret = register_pernet_subsys(&ctnetlink_net_ops);
3926 pr_err("ctnetlink_init: cannot register pernet operations\n");
3927 goto err_unreg_exp_subsys;
3929 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3930 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3931 RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3935 err_unreg_exp_subsys:
3936 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3938 nfnetlink_subsys_unregister(&ctnl_subsys);
3943 static void __exit ctnetlink_exit(void)
3945 unregister_pernet_subsys(&ctnetlink_net_ops);
3946 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3947 nfnetlink_subsys_unregister(&ctnl_subsys);
3948 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3949 RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3954 module_init(ctnetlink_init);
3955 module_exit(ctnetlink_exit);