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>
33 #include <linux/netfilter.h>
34 #include <net/netlink.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_core.h>
38 #include <net/netfilter/nf_conntrack_expect.h>
39 #include <net/netfilter/nf_conntrack_helper.h>
40 #include <net/netfilter/nf_conntrack_seqadj.h>
41 #include <net/netfilter/nf_conntrack_l3proto.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 #ifdef CONFIG_NF_NAT_NEEDED
50 #include <net/netfilter/nf_nat_core.h>
51 #include <net/netfilter/nf_nat_l4proto.h>
52 #include <net/netfilter/nf_nat_helper.h>
55 #include <linux/netfilter/nfnetlink.h>
56 #include <linux/netfilter/nfnetlink_conntrack.h>
58 MODULE_LICENSE("GPL");
60 static char __initdata version
[] = "0.93";
62 static int ctnetlink_dump_tuples_proto(struct sk_buff
*skb
,
63 const struct nf_conntrack_tuple
*tuple
,
64 const struct nf_conntrack_l4proto
*l4proto
)
67 struct nlattr
*nest_parms
;
69 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_PROTO
| NLA_F_NESTED
);
72 if (nla_put_u8(skb
, CTA_PROTO_NUM
, tuple
->dst
.protonum
))
75 if (likely(l4proto
->tuple_to_nlattr
))
76 ret
= l4proto
->tuple_to_nlattr(skb
, tuple
);
78 nla_nest_end(skb
, nest_parms
);
86 static int ctnetlink_dump_tuples_ip(struct sk_buff
*skb
,
87 const struct nf_conntrack_tuple
*tuple
,
88 const struct nf_conntrack_l3proto
*l3proto
)
91 struct nlattr
*nest_parms
;
93 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_IP
| NLA_F_NESTED
);
97 if (likely(l3proto
->tuple_to_nlattr
))
98 ret
= l3proto
->tuple_to_nlattr(skb
, tuple
);
100 nla_nest_end(skb
, nest_parms
);
108 static int ctnetlink_dump_tuples(struct sk_buff
*skb
,
109 const struct nf_conntrack_tuple
*tuple
)
111 const struct nf_conntrack_l3proto
*l3proto
;
112 const struct nf_conntrack_l4proto
*l4proto
;
116 l3proto
= __nf_ct_l3proto_find(tuple
->src
.l3num
);
117 ret
= ctnetlink_dump_tuples_ip(skb
, tuple
, l3proto
);
120 l4proto
= __nf_ct_l4proto_find(tuple
->src
.l3num
,
121 tuple
->dst
.protonum
);
122 ret
= ctnetlink_dump_tuples_proto(skb
, tuple
, l4proto
);
128 static int ctnetlink_dump_zone_id(struct sk_buff
*skb
, int attrtype
,
129 const struct nf_conntrack_zone
*zone
, int dir
)
131 if (zone
->id
== NF_CT_DEFAULT_ZONE_ID
|| zone
->dir
!= dir
)
133 if (nla_put_be16(skb
, attrtype
, htons(zone
->id
)))
134 goto nla_put_failure
;
141 static int ctnetlink_dump_status(struct sk_buff
*skb
, const struct nf_conn
*ct
)
143 if (nla_put_be32(skb
, CTA_STATUS
, htonl(ct
->status
)))
144 goto nla_put_failure
;
151 static int ctnetlink_dump_timeout(struct sk_buff
*skb
, const struct nf_conn
*ct
)
153 long timeout
= nf_ct_expires(ct
) / HZ
;
155 if (nla_put_be32(skb
, CTA_TIMEOUT
, htonl(timeout
)))
156 goto nla_put_failure
;
163 static int ctnetlink_dump_protoinfo(struct sk_buff
*skb
, struct nf_conn
*ct
)
165 const struct nf_conntrack_l4proto
*l4proto
;
166 struct nlattr
*nest_proto
;
169 l4proto
= __nf_ct_l4proto_find(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
170 if (!l4proto
->to_nlattr
)
173 nest_proto
= nla_nest_start(skb
, CTA_PROTOINFO
| NLA_F_NESTED
);
175 goto nla_put_failure
;
177 ret
= l4proto
->to_nlattr(skb
, nest_proto
, ct
);
179 nla_nest_end(skb
, nest_proto
);
187 static int ctnetlink_dump_helpinfo(struct sk_buff
*skb
,
188 const struct nf_conn
*ct
)
190 struct nlattr
*nest_helper
;
191 const struct nf_conn_help
*help
= nfct_help(ct
);
192 struct nf_conntrack_helper
*helper
;
197 helper
= rcu_dereference(help
->helper
);
201 nest_helper
= nla_nest_start(skb
, CTA_HELP
| NLA_F_NESTED
);
203 goto nla_put_failure
;
204 if (nla_put_string(skb
, CTA_HELP_NAME
, helper
->name
))
205 goto nla_put_failure
;
207 if (helper
->to_nlattr
)
208 helper
->to_nlattr(skb
, ct
);
210 nla_nest_end(skb
, nest_helper
);
219 dump_counters(struct sk_buff
*skb
, struct nf_conn_acct
*acct
,
220 enum ip_conntrack_dir dir
, int type
)
222 enum ctattr_type attr
= dir
? CTA_COUNTERS_REPLY
: CTA_COUNTERS_ORIG
;
223 struct nf_conn_counter
*counter
= acct
->counter
;
224 struct nlattr
*nest_count
;
227 if (type
== IPCTNL_MSG_CT_GET_CTRZERO
) {
228 pkts
= atomic64_xchg(&counter
[dir
].packets
, 0);
229 bytes
= atomic64_xchg(&counter
[dir
].bytes
, 0);
231 pkts
= atomic64_read(&counter
[dir
].packets
);
232 bytes
= atomic64_read(&counter
[dir
].bytes
);
235 nest_count
= nla_nest_start(skb
, attr
| NLA_F_NESTED
);
237 goto nla_put_failure
;
239 if (nla_put_be64(skb
, CTA_COUNTERS_PACKETS
, cpu_to_be64(pkts
),
241 nla_put_be64(skb
, CTA_COUNTERS_BYTES
, cpu_to_be64(bytes
),
243 goto nla_put_failure
;
245 nla_nest_end(skb
, nest_count
);
254 ctnetlink_dump_acct(struct sk_buff
*skb
, const struct nf_conn
*ct
, int type
)
256 struct nf_conn_acct
*acct
= nf_conn_acct_find(ct
);
261 if (dump_counters(skb
, acct
, IP_CT_DIR_ORIGINAL
, type
) < 0)
263 if (dump_counters(skb
, acct
, IP_CT_DIR_REPLY
, type
) < 0)
270 ctnetlink_dump_timestamp(struct sk_buff
*skb
, const struct nf_conn
*ct
)
272 struct nlattr
*nest_count
;
273 const struct nf_conn_tstamp
*tstamp
;
275 tstamp
= nf_conn_tstamp_find(ct
);
279 nest_count
= nla_nest_start(skb
, CTA_TIMESTAMP
| NLA_F_NESTED
);
281 goto nla_put_failure
;
283 if (nla_put_be64(skb
, CTA_TIMESTAMP_START
, cpu_to_be64(tstamp
->start
),
284 CTA_TIMESTAMP_PAD
) ||
285 (tstamp
->stop
!= 0 && nla_put_be64(skb
, CTA_TIMESTAMP_STOP
,
286 cpu_to_be64(tstamp
->stop
),
288 goto nla_put_failure
;
289 nla_nest_end(skb
, nest_count
);
297 #ifdef CONFIG_NF_CONNTRACK_MARK
298 static int ctnetlink_dump_mark(struct sk_buff
*skb
, const struct nf_conn
*ct
)
300 if (nla_put_be32(skb
, CTA_MARK
, htonl(ct
->mark
)))
301 goto nla_put_failure
;
308 #define ctnetlink_dump_mark(a, b) (0)
311 #ifdef CONFIG_NF_CONNTRACK_SECMARK
312 static int ctnetlink_dump_secctx(struct sk_buff
*skb
, const struct nf_conn
*ct
)
314 struct nlattr
*nest_secctx
;
318 ret
= security_secid_to_secctx(ct
->secmark
, &secctx
, &len
);
323 nest_secctx
= nla_nest_start(skb
, CTA_SECCTX
| NLA_F_NESTED
);
325 goto nla_put_failure
;
327 if (nla_put_string(skb
, CTA_SECCTX_NAME
, secctx
))
328 goto nla_put_failure
;
329 nla_nest_end(skb
, nest_secctx
);
333 security_release_secctx(secctx
, len
);
337 #define ctnetlink_dump_secctx(a, b) (0)
340 #ifdef CONFIG_NF_CONNTRACK_LABELS
341 static inline int ctnetlink_label_size(const struct nf_conn
*ct
)
343 struct nf_conn_labels
*labels
= nf_ct_labels_find(ct
);
347 return nla_total_size(sizeof(labels
->bits
));
351 ctnetlink_dump_labels(struct sk_buff
*skb
, const struct nf_conn
*ct
)
353 struct nf_conn_labels
*labels
= nf_ct_labels_find(ct
);
361 if (labels
->bits
[i
] != 0)
362 return nla_put(skb
, CTA_LABELS
, sizeof(labels
->bits
),
365 } while (i
< ARRAY_SIZE(labels
->bits
));
370 #define ctnetlink_dump_labels(a, b) (0)
371 #define ctnetlink_label_size(a) (0)
374 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
376 static int ctnetlink_dump_master(struct sk_buff
*skb
, const struct nf_conn
*ct
)
378 struct nlattr
*nest_parms
;
380 if (!(ct
->status
& IPS_EXPECTED
))
383 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_MASTER
| NLA_F_NESTED
);
385 goto nla_put_failure
;
386 if (ctnetlink_dump_tuples(skb
, master_tuple(ct
)) < 0)
387 goto nla_put_failure
;
388 nla_nest_end(skb
, nest_parms
);
397 dump_ct_seq_adj(struct sk_buff
*skb
, const struct nf_ct_seqadj
*seq
, int type
)
399 struct nlattr
*nest_parms
;
401 nest_parms
= nla_nest_start(skb
, type
| NLA_F_NESTED
);
403 goto nla_put_failure
;
405 if (nla_put_be32(skb
, CTA_SEQADJ_CORRECTION_POS
,
406 htonl(seq
->correction_pos
)) ||
407 nla_put_be32(skb
, CTA_SEQADJ_OFFSET_BEFORE
,
408 htonl(seq
->offset_before
)) ||
409 nla_put_be32(skb
, CTA_SEQADJ_OFFSET_AFTER
,
410 htonl(seq
->offset_after
)))
411 goto nla_put_failure
;
413 nla_nest_end(skb
, nest_parms
);
421 static int ctnetlink_dump_ct_seq_adj(struct sk_buff
*skb
, struct nf_conn
*ct
)
423 struct nf_conn_seqadj
*seqadj
= nfct_seqadj(ct
);
424 struct nf_ct_seqadj
*seq
;
426 if (!(ct
->status
& IPS_SEQ_ADJUST
) || !seqadj
)
429 spin_lock_bh(&ct
->lock
);
430 seq
= &seqadj
->seq
[IP_CT_DIR_ORIGINAL
];
431 if (dump_ct_seq_adj(skb
, seq
, CTA_SEQ_ADJ_ORIG
) == -1)
434 seq
= &seqadj
->seq
[IP_CT_DIR_REPLY
];
435 if (dump_ct_seq_adj(skb
, seq
, CTA_SEQ_ADJ_REPLY
) == -1)
438 spin_unlock_bh(&ct
->lock
);
441 spin_unlock_bh(&ct
->lock
);
445 static int ctnetlink_dump_id(struct sk_buff
*skb
, const struct nf_conn
*ct
)
447 if (nla_put_be32(skb
, CTA_ID
, htonl((unsigned long)ct
)))
448 goto nla_put_failure
;
455 static int ctnetlink_dump_use(struct sk_buff
*skb
, const struct nf_conn
*ct
)
457 if (nla_put_be32(skb
, CTA_USE
, htonl(atomic_read(&ct
->ct_general
.use
))))
458 goto nla_put_failure
;
466 ctnetlink_fill_info(struct sk_buff
*skb
, u32 portid
, u32 seq
, u32 type
,
469 const struct nf_conntrack_zone
*zone
;
470 struct nlmsghdr
*nlh
;
471 struct nfgenmsg
*nfmsg
;
472 struct nlattr
*nest_parms
;
473 unsigned int flags
= portid
? NLM_F_MULTI
: 0, event
;
475 event
= nfnl_msg_type(NFNL_SUBSYS_CTNETLINK
, IPCTNL_MSG_CT_NEW
);
476 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*nfmsg
), flags
);
480 nfmsg
= nlmsg_data(nlh
);
481 nfmsg
->nfgen_family
= nf_ct_l3num(ct
);
482 nfmsg
->version
= NFNETLINK_V0
;
485 zone
= nf_ct_zone(ct
);
487 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_ORIG
| NLA_F_NESTED
);
489 goto nla_put_failure
;
490 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
491 goto nla_put_failure
;
492 if (ctnetlink_dump_zone_id(skb
, CTA_TUPLE_ZONE
, zone
,
493 NF_CT_ZONE_DIR_ORIG
) < 0)
494 goto nla_put_failure
;
495 nla_nest_end(skb
, nest_parms
);
497 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_REPLY
| NLA_F_NESTED
);
499 goto nla_put_failure
;
500 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
501 goto nla_put_failure
;
502 if (ctnetlink_dump_zone_id(skb
, CTA_TUPLE_ZONE
, zone
,
503 NF_CT_ZONE_DIR_REPL
) < 0)
504 goto nla_put_failure
;
505 nla_nest_end(skb
, nest_parms
);
507 if (ctnetlink_dump_zone_id(skb
, CTA_ZONE
, zone
,
508 NF_CT_DEFAULT_ZONE_DIR
) < 0)
509 goto nla_put_failure
;
511 if (ctnetlink_dump_status(skb
, ct
) < 0 ||
512 ctnetlink_dump_timeout(skb
, ct
) < 0 ||
513 ctnetlink_dump_acct(skb
, ct
, type
) < 0 ||
514 ctnetlink_dump_timestamp(skb
, ct
) < 0 ||
515 ctnetlink_dump_protoinfo(skb
, ct
) < 0 ||
516 ctnetlink_dump_helpinfo(skb
, ct
) < 0 ||
517 ctnetlink_dump_mark(skb
, ct
) < 0 ||
518 ctnetlink_dump_secctx(skb
, ct
) < 0 ||
519 ctnetlink_dump_labels(skb
, ct
) < 0 ||
520 ctnetlink_dump_id(skb
, ct
) < 0 ||
521 ctnetlink_dump_use(skb
, ct
) < 0 ||
522 ctnetlink_dump_master(skb
, ct
) < 0 ||
523 ctnetlink_dump_ct_seq_adj(skb
, ct
) < 0)
524 goto nla_put_failure
;
531 nlmsg_cancel(skb
, nlh
);
535 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
536 static size_t ctnetlink_proto_size(const struct nf_conn
*ct
)
538 const struct nf_conntrack_l3proto
*l3proto
;
539 const struct nf_conntrack_l4proto
*l4proto
;
540 size_t len
, len4
= 0;
542 l3proto
= __nf_ct_l3proto_find(nf_ct_l3num(ct
));
543 len
= l3proto
->nla_size
;
544 len
*= 3u; /* ORIG, REPLY, MASTER */
546 l4proto
= __nf_ct_l4proto_find(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
547 len
+= l4proto
->nla_size
;
548 if (l4proto
->nlattr_tuple_size
) {
549 len4
= l4proto
->nlattr_tuple_size();
550 len4
*= 3u; /* ORIG, REPLY, MASTER */
557 static inline size_t ctnetlink_acct_size(const struct nf_conn
*ct
)
559 if (!nf_ct_ext_exist(ct
, NF_CT_EXT_ACCT
))
561 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
562 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
563 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
567 static inline int ctnetlink_secctx_size(const struct nf_conn
*ct
)
569 #ifdef CONFIG_NF_CONNTRACK_SECMARK
572 ret
= security_secid_to_secctx(ct
->secmark
, NULL
, &len
);
576 return nla_total_size(0) /* CTA_SECCTX */
577 + nla_total_size(sizeof(char) * len
); /* CTA_SECCTX_NAME */
583 static inline size_t ctnetlink_timestamp_size(const struct nf_conn
*ct
)
585 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
586 if (!nf_ct_ext_exist(ct
, NF_CT_EXT_TSTAMP
))
588 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
594 #ifdef CONFIG_NF_CONNTRACK_EVENTS
595 static size_t ctnetlink_nlmsg_size(const struct nf_conn
*ct
)
597 return NLMSG_ALIGN(sizeof(struct nfgenmsg
))
598 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
599 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
600 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
601 + 3 * nla_total_size(sizeof(u_int8_t
)) /* CTA_PROTO_NUM */
602 + nla_total_size(sizeof(u_int32_t
)) /* CTA_ID */
603 + nla_total_size(sizeof(u_int32_t
)) /* CTA_STATUS */
604 + ctnetlink_acct_size(ct
)
605 + ctnetlink_timestamp_size(ct
)
606 + nla_total_size(sizeof(u_int32_t
)) /* CTA_TIMEOUT */
607 + nla_total_size(0) /* CTA_PROTOINFO */
608 + nla_total_size(0) /* CTA_HELP */
609 + nla_total_size(NF_CT_HELPER_NAME_LEN
) /* CTA_HELP_NAME */
610 + ctnetlink_secctx_size(ct
)
611 #ifdef CONFIG_NF_NAT_NEEDED
612 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
613 + 6 * nla_total_size(sizeof(u_int32_t
)) /* CTA_NAT_SEQ_OFFSET */
615 #ifdef CONFIG_NF_CONNTRACK_MARK
616 + nla_total_size(sizeof(u_int32_t
)) /* CTA_MARK */
618 #ifdef CONFIG_NF_CONNTRACK_ZONES
619 + nla_total_size(sizeof(u_int16_t
)) /* CTA_ZONE|CTA_TUPLE_ZONE */
621 + ctnetlink_proto_size(ct
)
622 + ctnetlink_label_size(ct
)
627 ctnetlink_conntrack_event(unsigned int events
, struct nf_ct_event
*item
)
629 const struct nf_conntrack_zone
*zone
;
631 struct nlmsghdr
*nlh
;
632 struct nfgenmsg
*nfmsg
;
633 struct nlattr
*nest_parms
;
634 struct nf_conn
*ct
= item
->ct
;
637 unsigned int flags
= 0, group
;
640 if (events
& (1 << IPCT_DESTROY
)) {
641 type
= IPCTNL_MSG_CT_DELETE
;
642 group
= NFNLGRP_CONNTRACK_DESTROY
;
643 } else if (events
& ((1 << IPCT_NEW
) | (1 << IPCT_RELATED
))) {
644 type
= IPCTNL_MSG_CT_NEW
;
645 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
646 group
= NFNLGRP_CONNTRACK_NEW
;
648 type
= IPCTNL_MSG_CT_NEW
;
649 group
= NFNLGRP_CONNTRACK_UPDATE
;
654 if (!item
->report
&& !nfnetlink_has_listeners(net
, group
))
657 skb
= nlmsg_new(ctnetlink_nlmsg_size(ct
), GFP_ATOMIC
);
661 type
= nfnl_msg_type(NFNL_SUBSYS_CTNETLINK
, type
);
662 nlh
= nlmsg_put(skb
, item
->portid
, 0, type
, sizeof(*nfmsg
), flags
);
666 nfmsg
= nlmsg_data(nlh
);
667 nfmsg
->nfgen_family
= nf_ct_l3num(ct
);
668 nfmsg
->version
= NFNETLINK_V0
;
671 zone
= nf_ct_zone(ct
);
673 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_ORIG
| NLA_F_NESTED
);
675 goto nla_put_failure
;
676 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
677 goto nla_put_failure
;
678 if (ctnetlink_dump_zone_id(skb
, CTA_TUPLE_ZONE
, zone
,
679 NF_CT_ZONE_DIR_ORIG
) < 0)
680 goto nla_put_failure
;
681 nla_nest_end(skb
, nest_parms
);
683 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_REPLY
| NLA_F_NESTED
);
685 goto nla_put_failure
;
686 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
687 goto nla_put_failure
;
688 if (ctnetlink_dump_zone_id(skb
, CTA_TUPLE_ZONE
, zone
,
689 NF_CT_ZONE_DIR_REPL
) < 0)
690 goto nla_put_failure
;
691 nla_nest_end(skb
, nest_parms
);
693 if (ctnetlink_dump_zone_id(skb
, CTA_ZONE
, zone
,
694 NF_CT_DEFAULT_ZONE_DIR
) < 0)
695 goto nla_put_failure
;
697 if (ctnetlink_dump_id(skb
, ct
) < 0)
698 goto nla_put_failure
;
700 if (ctnetlink_dump_status(skb
, ct
) < 0)
701 goto nla_put_failure
;
703 if (events
& (1 << IPCT_DESTROY
)) {
704 if (ctnetlink_dump_acct(skb
, ct
, type
) < 0 ||
705 ctnetlink_dump_timestamp(skb
, ct
) < 0)
706 goto nla_put_failure
;
708 if (ctnetlink_dump_timeout(skb
, ct
) < 0)
709 goto nla_put_failure
;
711 if (events
& (1 << IPCT_PROTOINFO
)
712 && ctnetlink_dump_protoinfo(skb
, ct
) < 0)
713 goto nla_put_failure
;
715 if ((events
& (1 << IPCT_HELPER
) || nfct_help(ct
))
716 && ctnetlink_dump_helpinfo(skb
, ct
) < 0)
717 goto nla_put_failure
;
719 #ifdef CONFIG_NF_CONNTRACK_SECMARK
720 if ((events
& (1 << IPCT_SECMARK
) || ct
->secmark
)
721 && ctnetlink_dump_secctx(skb
, ct
) < 0)
722 goto nla_put_failure
;
724 if (events
& (1 << IPCT_LABEL
) &&
725 ctnetlink_dump_labels(skb
, ct
) < 0)
726 goto nla_put_failure
;
728 if (events
& (1 << IPCT_RELATED
) &&
729 ctnetlink_dump_master(skb
, ct
) < 0)
730 goto nla_put_failure
;
732 if (events
& (1 << IPCT_SEQADJ
) &&
733 ctnetlink_dump_ct_seq_adj(skb
, ct
) < 0)
734 goto nla_put_failure
;
737 #ifdef CONFIG_NF_CONNTRACK_MARK
738 if ((events
& (1 << IPCT_MARK
) || ct
->mark
)
739 && ctnetlink_dump_mark(skb
, ct
) < 0)
740 goto nla_put_failure
;
743 err
= nfnetlink_send(skb
, net
, item
->portid
, group
, item
->report
,
745 if (err
== -ENOBUFS
|| err
== -EAGAIN
)
751 nlmsg_cancel(skb
, nlh
);
755 if (nfnetlink_set_err(net
, 0, group
, -ENOBUFS
) > 0)
760 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
762 static int ctnetlink_done(struct netlink_callback
*cb
)
765 nf_ct_put((struct nf_conn
*)cb
->args
[1]);
770 struct ctnetlink_filter
{
777 static struct ctnetlink_filter
*
778 ctnetlink_alloc_filter(const struct nlattr
* const cda
[])
780 #ifdef CONFIG_NF_CONNTRACK_MARK
781 struct ctnetlink_filter
*filter
;
783 filter
= kzalloc(sizeof(*filter
), GFP_KERNEL
);
785 return ERR_PTR(-ENOMEM
);
787 filter
->mark
.val
= ntohl(nla_get_be32(cda
[CTA_MARK
]));
788 filter
->mark
.mask
= ntohl(nla_get_be32(cda
[CTA_MARK_MASK
]));
792 return ERR_PTR(-EOPNOTSUPP
);
796 static int ctnetlink_filter_match(struct nf_conn
*ct
, void *data
)
798 struct ctnetlink_filter
*filter
= data
;
803 #ifdef CONFIG_NF_CONNTRACK_MARK
804 if ((ct
->mark
& filter
->mark
.mask
) == filter
->mark
.val
)
812 ctnetlink_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
814 struct net
*net
= sock_net(skb
->sk
);
815 struct nf_conn
*ct
, *last
;
816 struct nf_conntrack_tuple_hash
*h
;
817 struct hlist_nulls_node
*n
;
818 struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
819 u_int8_t l3proto
= nfmsg
->nfgen_family
;
820 struct nf_conn
*nf_ct_evict
[8];
824 last
= (struct nf_conn
*)cb
->args
[1];
828 for (; cb
->args
[0] < nf_conntrack_htable_size
; cb
->args
[0]++) {
832 if (nf_ct_should_gc(nf_ct_evict
[i
]))
833 nf_ct_kill(nf_ct_evict
[i
]);
834 nf_ct_put(nf_ct_evict
[i
]);
837 lockp
= &nf_conntrack_locks
[cb
->args
[0] % CONNTRACK_LOCKS
];
838 nf_conntrack_lock(lockp
);
839 if (cb
->args
[0] >= nf_conntrack_htable_size
) {
843 hlist_nulls_for_each_entry(h
, n
, &nf_conntrack_hash
[cb
->args
[0]],
845 if (NF_CT_DIRECTION(h
) != IP_CT_DIR_ORIGINAL
)
847 ct
= nf_ct_tuplehash_to_ctrack(h
);
848 if (nf_ct_is_expired(ct
)) {
849 if (i
< ARRAY_SIZE(nf_ct_evict
) &&
850 atomic_inc_not_zero(&ct
->ct_general
.use
))
851 nf_ct_evict
[i
++] = ct
;
855 if (!net_eq(net
, nf_ct_net(ct
)))
858 /* Dump entries of a given L3 protocol number.
859 * If it is not specified, ie. l3proto == 0,
860 * then dump everything. */
861 if (l3proto
&& nf_ct_l3num(ct
) != l3proto
)
868 if (!ctnetlink_filter_match(ct
, cb
->data
))
873 ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).portid
,
875 NFNL_MSG_TYPE(cb
->nlh
->nlmsg_type
),
879 nf_conntrack_get(&ct
->ct_general
);
880 cb
->args
[1] = (unsigned long)ct
;
894 /* nf ct hash resize happened, now clear the leftover. */
895 if ((struct nf_conn
*)cb
->args
[1] == last
)
903 if (nf_ct_should_gc(nf_ct_evict
[i
]))
904 nf_ct_kill(nf_ct_evict
[i
]);
905 nf_ct_put(nf_ct_evict
[i
]);
911 static int ctnetlink_parse_tuple_ip(struct nlattr
*attr
,
912 struct nf_conntrack_tuple
*tuple
)
914 struct nlattr
*tb
[CTA_IP_MAX
+1];
915 struct nf_conntrack_l3proto
*l3proto
;
918 ret
= nla_parse_nested(tb
, CTA_IP_MAX
, attr
, NULL
, NULL
);
923 l3proto
= __nf_ct_l3proto_find(tuple
->src
.l3num
);
925 if (likely(l3proto
->nlattr_to_tuple
)) {
926 ret
= nla_validate_nested(attr
, CTA_IP_MAX
,
927 l3proto
->nla_policy
, NULL
);
929 ret
= l3proto
->nlattr_to_tuple(tb
, tuple
);
937 static const struct nla_policy proto_nla_policy
[CTA_PROTO_MAX
+1] = {
938 [CTA_PROTO_NUM
] = { .type
= NLA_U8
},
941 static int ctnetlink_parse_tuple_proto(struct nlattr
*attr
,
942 struct nf_conntrack_tuple
*tuple
)
944 const struct nf_conntrack_l4proto
*l4proto
;
945 struct nlattr
*tb
[CTA_PROTO_MAX
+1];
948 ret
= nla_parse_nested(tb
, CTA_PROTO_MAX
, attr
, proto_nla_policy
,
953 if (!tb
[CTA_PROTO_NUM
])
955 tuple
->dst
.protonum
= nla_get_u8(tb
[CTA_PROTO_NUM
]);
958 l4proto
= __nf_ct_l4proto_find(tuple
->src
.l3num
, tuple
->dst
.protonum
);
960 if (likely(l4proto
->nlattr_to_tuple
)) {
961 ret
= nla_validate_nested(attr
, CTA_PROTO_MAX
,
962 l4proto
->nla_policy
, NULL
);
964 ret
= l4proto
->nlattr_to_tuple(tb
, tuple
);
973 ctnetlink_parse_zone(const struct nlattr
*attr
,
974 struct nf_conntrack_zone
*zone
)
976 nf_ct_zone_init(zone
, NF_CT_DEFAULT_ZONE_ID
,
977 NF_CT_DEFAULT_ZONE_DIR
, 0);
978 #ifdef CONFIG_NF_CONNTRACK_ZONES
980 zone
->id
= ntohs(nla_get_be16(attr
));
989 ctnetlink_parse_tuple_zone(struct nlattr
*attr
, enum ctattr_type type
,
990 struct nf_conntrack_zone
*zone
)
994 if (zone
->id
!= NF_CT_DEFAULT_ZONE_ID
)
997 ret
= ctnetlink_parse_zone(attr
, zone
);
1001 if (type
== CTA_TUPLE_REPLY
)
1002 zone
->dir
= NF_CT_ZONE_DIR_REPL
;
1004 zone
->dir
= NF_CT_ZONE_DIR_ORIG
;
1009 static const struct nla_policy tuple_nla_policy
[CTA_TUPLE_MAX
+1] = {
1010 [CTA_TUPLE_IP
] = { .type
= NLA_NESTED
},
1011 [CTA_TUPLE_PROTO
] = { .type
= NLA_NESTED
},
1012 [CTA_TUPLE_ZONE
] = { .type
= NLA_U16
},
1016 ctnetlink_parse_tuple(const struct nlattr
* const cda
[],
1017 struct nf_conntrack_tuple
*tuple
, u32 type
,
1018 u_int8_t l3num
, struct nf_conntrack_zone
*zone
)
1020 struct nlattr
*tb
[CTA_TUPLE_MAX
+1];
1023 memset(tuple
, 0, sizeof(*tuple
));
1025 err
= nla_parse_nested(tb
, CTA_TUPLE_MAX
, cda
[type
], tuple_nla_policy
,
1030 if (!tb
[CTA_TUPLE_IP
])
1033 tuple
->src
.l3num
= l3num
;
1035 err
= ctnetlink_parse_tuple_ip(tb
[CTA_TUPLE_IP
], tuple
);
1039 if (!tb
[CTA_TUPLE_PROTO
])
1042 err
= ctnetlink_parse_tuple_proto(tb
[CTA_TUPLE_PROTO
], tuple
);
1046 if (tb
[CTA_TUPLE_ZONE
]) {
1050 err
= ctnetlink_parse_tuple_zone(tb
[CTA_TUPLE_ZONE
],
1056 /* orig and expect tuples get DIR_ORIGINAL */
1057 if (type
== CTA_TUPLE_REPLY
)
1058 tuple
->dst
.dir
= IP_CT_DIR_REPLY
;
1060 tuple
->dst
.dir
= IP_CT_DIR_ORIGINAL
;
1065 static const struct nla_policy help_nla_policy
[CTA_HELP_MAX
+1] = {
1066 [CTA_HELP_NAME
] = { .type
= NLA_NUL_STRING
,
1067 .len
= NF_CT_HELPER_NAME_LEN
- 1 },
1070 static int ctnetlink_parse_help(const struct nlattr
*attr
, char **helper_name
,
1071 struct nlattr
**helpinfo
)
1074 struct nlattr
*tb
[CTA_HELP_MAX
+1];
1076 err
= nla_parse_nested(tb
, CTA_HELP_MAX
, attr
, help_nla_policy
, NULL
);
1080 if (!tb
[CTA_HELP_NAME
])
1083 *helper_name
= nla_data(tb
[CTA_HELP_NAME
]);
1085 if (tb
[CTA_HELP_INFO
])
1086 *helpinfo
= tb
[CTA_HELP_INFO
];
1091 static const struct nla_policy ct_nla_policy
[CTA_MAX
+1] = {
1092 [CTA_TUPLE_ORIG
] = { .type
= NLA_NESTED
},
1093 [CTA_TUPLE_REPLY
] = { .type
= NLA_NESTED
},
1094 [CTA_STATUS
] = { .type
= NLA_U32
},
1095 [CTA_PROTOINFO
] = { .type
= NLA_NESTED
},
1096 [CTA_HELP
] = { .type
= NLA_NESTED
},
1097 [CTA_NAT_SRC
] = { .type
= NLA_NESTED
},
1098 [CTA_TIMEOUT
] = { .type
= NLA_U32
},
1099 [CTA_MARK
] = { .type
= NLA_U32
},
1100 [CTA_ID
] = { .type
= NLA_U32
},
1101 [CTA_NAT_DST
] = { .type
= NLA_NESTED
},
1102 [CTA_TUPLE_MASTER
] = { .type
= NLA_NESTED
},
1103 [CTA_NAT_SEQ_ADJ_ORIG
] = { .type
= NLA_NESTED
},
1104 [CTA_NAT_SEQ_ADJ_REPLY
] = { .type
= NLA_NESTED
},
1105 [CTA_ZONE
] = { .type
= NLA_U16
},
1106 [CTA_MARK_MASK
] = { .type
= NLA_U32
},
1107 [CTA_LABELS
] = { .type
= NLA_BINARY
,
1108 .len
= NF_CT_LABELS_MAX_SIZE
},
1109 [CTA_LABELS_MASK
] = { .type
= NLA_BINARY
,
1110 .len
= NF_CT_LABELS_MAX_SIZE
},
1113 static int ctnetlink_flush_conntrack(struct net
*net
,
1114 const struct nlattr
* const cda
[],
1115 u32 portid
, int report
)
1117 struct ctnetlink_filter
*filter
= NULL
;
1119 if (cda
[CTA_MARK
] && cda
[CTA_MARK_MASK
]) {
1120 filter
= ctnetlink_alloc_filter(cda
);
1122 return PTR_ERR(filter
);
1125 nf_ct_iterate_cleanup_net(net
, ctnetlink_filter_match
, filter
,
1132 static int ctnetlink_del_conntrack(struct net
*net
, struct sock
*ctnl
,
1133 struct sk_buff
*skb
,
1134 const struct nlmsghdr
*nlh
,
1135 const struct nlattr
* const cda
[],
1136 struct netlink_ext_ack
*extack
)
1138 struct nf_conntrack_tuple_hash
*h
;
1139 struct nf_conntrack_tuple tuple
;
1141 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1142 u_int8_t u3
= nfmsg
->nfgen_family
;
1143 struct nf_conntrack_zone zone
;
1146 err
= ctnetlink_parse_zone(cda
[CTA_ZONE
], &zone
);
1150 if (cda
[CTA_TUPLE_ORIG
])
1151 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
,
1153 else if (cda
[CTA_TUPLE_REPLY
])
1154 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
,
1157 return ctnetlink_flush_conntrack(net
, cda
,
1158 NETLINK_CB(skb
).portid
,
1165 h
= nf_conntrack_find_get(net
, &zone
, &tuple
);
1169 ct
= nf_ct_tuplehash_to_ctrack(h
);
1172 u_int32_t id
= ntohl(nla_get_be32(cda
[CTA_ID
]));
1173 if (id
!= (u32
)(unsigned long)ct
) {
1179 nf_ct_delete(ct
, NETLINK_CB(skb
).portid
, nlmsg_report(nlh
));
1185 static int ctnetlink_get_conntrack(struct net
*net
, struct sock
*ctnl
,
1186 struct sk_buff
*skb
,
1187 const struct nlmsghdr
*nlh
,
1188 const struct nlattr
* const cda
[],
1189 struct netlink_ext_ack
*extack
)
1191 struct nf_conntrack_tuple_hash
*h
;
1192 struct nf_conntrack_tuple tuple
;
1194 struct sk_buff
*skb2
= NULL
;
1195 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1196 u_int8_t u3
= nfmsg
->nfgen_family
;
1197 struct nf_conntrack_zone zone
;
1200 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1201 struct netlink_dump_control c
= {
1202 .dump
= ctnetlink_dump_table
,
1203 .done
= ctnetlink_done
,
1206 if (cda
[CTA_MARK
] && cda
[CTA_MARK_MASK
]) {
1207 struct ctnetlink_filter
*filter
;
1209 filter
= ctnetlink_alloc_filter(cda
);
1211 return PTR_ERR(filter
);
1215 return netlink_dump_start(ctnl
, skb
, nlh
, &c
);
1218 err
= ctnetlink_parse_zone(cda
[CTA_ZONE
], &zone
);
1222 if (cda
[CTA_TUPLE_ORIG
])
1223 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
,
1225 else if (cda
[CTA_TUPLE_REPLY
])
1226 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
,
1234 h
= nf_conntrack_find_get(net
, &zone
, &tuple
);
1238 ct
= nf_ct_tuplehash_to_ctrack(h
);
1241 skb2
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
1248 err
= ctnetlink_fill_info(skb2
, NETLINK_CB(skb
).portid
, nlh
->nlmsg_seq
,
1249 NFNL_MSG_TYPE(nlh
->nlmsg_type
), ct
);
1255 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).portid
, MSG_DONTWAIT
);
1264 /* this avoids a loop in nfnetlink. */
1265 return err
== -EAGAIN
? -ENOBUFS
: err
;
1268 static int ctnetlink_done_list(struct netlink_callback
*cb
)
1271 nf_ct_put((struct nf_conn
*)cb
->args
[1]);
1276 ctnetlink_dump_list(struct sk_buff
*skb
, struct netlink_callback
*cb
, bool dying
)
1278 struct nf_conn
*ct
, *last
;
1279 struct nf_conntrack_tuple_hash
*h
;
1280 struct hlist_nulls_node
*n
;
1281 struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
1282 u_int8_t l3proto
= nfmsg
->nfgen_family
;
1285 struct hlist_nulls_head
*list
;
1286 struct net
*net
= sock_net(skb
->sk
);
1291 last
= (struct nf_conn
*)cb
->args
[1];
1293 for (cpu
= cb
->args
[0]; cpu
< nr_cpu_ids
; cpu
++) {
1294 struct ct_pcpu
*pcpu
;
1296 if (!cpu_possible(cpu
))
1299 pcpu
= per_cpu_ptr(net
->ct
.pcpu_lists
, cpu
);
1300 spin_lock_bh(&pcpu
->lock
);
1301 list
= dying
? &pcpu
->dying
: &pcpu
->unconfirmed
;
1303 hlist_nulls_for_each_entry(h
, n
, list
, hnnode
) {
1304 ct
= nf_ct_tuplehash_to_ctrack(h
);
1305 if (l3proto
&& nf_ct_l3num(ct
) != l3proto
)
1313 res
= ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).portid
,
1315 NFNL_MSG_TYPE(cb
->nlh
->nlmsg_type
),
1319 if (!atomic_inc_not_zero(&ct
->ct_general
.use
))
1322 cb
->args
[1] = (unsigned long)ct
;
1323 spin_unlock_bh(&pcpu
->lock
);
1331 spin_unlock_bh(&pcpu
->lock
);
1342 ctnetlink_dump_dying(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1344 return ctnetlink_dump_list(skb
, cb
, true);
1347 static int ctnetlink_get_ct_dying(struct net
*net
, struct sock
*ctnl
,
1348 struct sk_buff
*skb
,
1349 const struct nlmsghdr
*nlh
,
1350 const struct nlattr
* const cda
[],
1351 struct netlink_ext_ack
*extack
)
1353 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1354 struct netlink_dump_control c
= {
1355 .dump
= ctnetlink_dump_dying
,
1356 .done
= ctnetlink_done_list
,
1358 return netlink_dump_start(ctnl
, skb
, nlh
, &c
);
1365 ctnetlink_dump_unconfirmed(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1367 return ctnetlink_dump_list(skb
, cb
, false);
1370 static int ctnetlink_get_ct_unconfirmed(struct net
*net
, struct sock
*ctnl
,
1371 struct sk_buff
*skb
,
1372 const struct nlmsghdr
*nlh
,
1373 const struct nlattr
* const cda
[],
1374 struct netlink_ext_ack
*extack
)
1376 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1377 struct netlink_dump_control c
= {
1378 .dump
= ctnetlink_dump_unconfirmed
,
1379 .done
= ctnetlink_done_list
,
1381 return netlink_dump_start(ctnl
, skb
, nlh
, &c
);
1387 #ifdef CONFIG_NF_NAT_NEEDED
1389 ctnetlink_parse_nat_setup(struct nf_conn
*ct
,
1390 enum nf_nat_manip_type manip
,
1391 const struct nlattr
*attr
)
1393 typeof(nfnetlink_parse_nat_setup_hook
) parse_nat_setup
;
1396 parse_nat_setup
= rcu_dereference(nfnetlink_parse_nat_setup_hook
);
1397 if (!parse_nat_setup
) {
1398 #ifdef CONFIG_MODULES
1400 nfnl_unlock(NFNL_SUBSYS_CTNETLINK
);
1401 if (request_module("nf-nat") < 0) {
1402 nfnl_lock(NFNL_SUBSYS_CTNETLINK
);
1406 nfnl_lock(NFNL_SUBSYS_CTNETLINK
);
1408 if (nfnetlink_parse_nat_setup_hook
)
1414 err
= parse_nat_setup(ct
, manip
, attr
);
1415 if (err
== -EAGAIN
) {
1416 #ifdef CONFIG_MODULES
1418 nfnl_unlock(NFNL_SUBSYS_CTNETLINK
);
1419 if (request_module("nf-nat-%u", nf_ct_l3num(ct
)) < 0) {
1420 nfnl_lock(NFNL_SUBSYS_CTNETLINK
);
1424 nfnl_lock(NFNL_SUBSYS_CTNETLINK
);
1435 __ctnetlink_change_status(struct nf_conn
*ct
, unsigned long on
,
1440 /* Ignore these unchangable bits */
1441 on
&= ~IPS_UNCHANGEABLE_MASK
;
1442 off
&= ~IPS_UNCHANGEABLE_MASK
;
1444 for (bit
= 0; bit
< __IPS_MAX_BIT
; bit
++) {
1445 if (on
& (1 << bit
))
1446 set_bit(bit
, &ct
->status
);
1447 else if (off
& (1 << bit
))
1448 clear_bit(bit
, &ct
->status
);
1453 ctnetlink_change_status(struct nf_conn
*ct
, const struct nlattr
* const cda
[])
1456 unsigned int status
= ntohl(nla_get_be32(cda
[CTA_STATUS
]));
1457 d
= ct
->status
^ status
;
1459 if (d
& (IPS_EXPECTED
|IPS_CONFIRMED
|IPS_DYING
))
1463 if (d
& IPS_SEEN_REPLY
&& !(status
& IPS_SEEN_REPLY
))
1464 /* SEEN_REPLY bit can only be set */
1467 if (d
& IPS_ASSURED
&& !(status
& IPS_ASSURED
))
1468 /* ASSURED bit can only be set */
1471 __ctnetlink_change_status(ct
, status
, 0);
1476 ctnetlink_setup_nat(struct nf_conn
*ct
, const struct nlattr
* const cda
[])
1478 #ifdef CONFIG_NF_NAT_NEEDED
1481 if (!cda
[CTA_NAT_DST
] && !cda
[CTA_NAT_SRC
])
1484 ret
= ctnetlink_parse_nat_setup(ct
, NF_NAT_MANIP_DST
,
1489 ret
= ctnetlink_parse_nat_setup(ct
, NF_NAT_MANIP_SRC
,
1493 if (!cda
[CTA_NAT_DST
] && !cda
[CTA_NAT_SRC
])
1499 static int ctnetlink_change_helper(struct nf_conn
*ct
,
1500 const struct nlattr
* const cda
[])
1502 struct nf_conntrack_helper
*helper
;
1503 struct nf_conn_help
*help
= nfct_help(ct
);
1504 char *helpname
= NULL
;
1505 struct nlattr
*helpinfo
= NULL
;
1508 err
= ctnetlink_parse_help(cda
[CTA_HELP
], &helpname
, &helpinfo
);
1512 /* don't change helper of sibling connections */
1514 /* If we try to change the helper to the same thing twice,
1515 * treat the second attempt as a no-op instead of returning
1521 helper
= rcu_dereference(help
->helper
);
1522 if (helper
&& !strcmp(helper
->name
, helpname
))
1530 if (!strcmp(helpname
, "")) {
1531 if (help
&& help
->helper
) {
1532 /* we had a helper before ... */
1533 nf_ct_remove_expectations(ct
);
1534 RCU_INIT_POINTER(help
->helper
, NULL
);
1541 helper
= __nf_conntrack_helper_find(helpname
, nf_ct_l3num(ct
),
1542 nf_ct_protonum(ct
));
1543 if (helper
== NULL
) {
1549 if (help
->helper
== helper
) {
1550 /* update private helper data if allowed. */
1551 if (helper
->from_nlattr
)
1552 helper
->from_nlattr(helpinfo
, ct
);
1557 /* we cannot set a helper for an existing conntrack */
1565 static int ctnetlink_change_timeout(struct nf_conn
*ct
,
1566 const struct nlattr
* const cda
[])
1568 u64 timeout
= (u64
)ntohl(nla_get_be32(cda
[CTA_TIMEOUT
])) * HZ
;
1570 if (timeout
> INT_MAX
)
1572 ct
->timeout
= nfct_time_stamp
+ (u32
)timeout
;
1574 if (test_bit(IPS_DYING_BIT
, &ct
->status
))
1580 static const struct nla_policy protoinfo_policy
[CTA_PROTOINFO_MAX
+1] = {
1581 [CTA_PROTOINFO_TCP
] = { .type
= NLA_NESTED
},
1582 [CTA_PROTOINFO_DCCP
] = { .type
= NLA_NESTED
},
1583 [CTA_PROTOINFO_SCTP
] = { .type
= NLA_NESTED
},
1586 static int ctnetlink_change_protoinfo(struct nf_conn
*ct
,
1587 const struct nlattr
* const cda
[])
1589 const struct nlattr
*attr
= cda
[CTA_PROTOINFO
];
1590 const struct nf_conntrack_l4proto
*l4proto
;
1591 struct nlattr
*tb
[CTA_PROTOINFO_MAX
+1];
1594 err
= nla_parse_nested(tb
, CTA_PROTOINFO_MAX
, attr
, protoinfo_policy
,
1600 l4proto
= __nf_ct_l4proto_find(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
1601 if (l4proto
->from_nlattr
)
1602 err
= l4proto
->from_nlattr(tb
, ct
);
1608 static const struct nla_policy seqadj_policy
[CTA_SEQADJ_MAX
+1] = {
1609 [CTA_SEQADJ_CORRECTION_POS
] = { .type
= NLA_U32
},
1610 [CTA_SEQADJ_OFFSET_BEFORE
] = { .type
= NLA_U32
},
1611 [CTA_SEQADJ_OFFSET_AFTER
] = { .type
= NLA_U32
},
1614 static int change_seq_adj(struct nf_ct_seqadj
*seq
,
1615 const struct nlattr
* const attr
)
1618 struct nlattr
*cda
[CTA_SEQADJ_MAX
+1];
1620 err
= nla_parse_nested(cda
, CTA_SEQADJ_MAX
, attr
, seqadj_policy
, NULL
);
1624 if (!cda
[CTA_SEQADJ_CORRECTION_POS
])
1627 seq
->correction_pos
=
1628 ntohl(nla_get_be32(cda
[CTA_SEQADJ_CORRECTION_POS
]));
1630 if (!cda
[CTA_SEQADJ_OFFSET_BEFORE
])
1633 seq
->offset_before
=
1634 ntohl(nla_get_be32(cda
[CTA_SEQADJ_OFFSET_BEFORE
]));
1636 if (!cda
[CTA_SEQADJ_OFFSET_AFTER
])
1640 ntohl(nla_get_be32(cda
[CTA_SEQADJ_OFFSET_AFTER
]));
1646 ctnetlink_change_seq_adj(struct nf_conn
*ct
,
1647 const struct nlattr
* const cda
[])
1649 struct nf_conn_seqadj
*seqadj
= nfct_seqadj(ct
);
1655 spin_lock_bh(&ct
->lock
);
1656 if (cda
[CTA_SEQ_ADJ_ORIG
]) {
1657 ret
= change_seq_adj(&seqadj
->seq
[IP_CT_DIR_ORIGINAL
],
1658 cda
[CTA_SEQ_ADJ_ORIG
]);
1662 set_bit(IPS_SEQ_ADJUST_BIT
, &ct
->status
);
1665 if (cda
[CTA_SEQ_ADJ_REPLY
]) {
1666 ret
= change_seq_adj(&seqadj
->seq
[IP_CT_DIR_REPLY
],
1667 cda
[CTA_SEQ_ADJ_REPLY
]);
1671 set_bit(IPS_SEQ_ADJUST_BIT
, &ct
->status
);
1674 spin_unlock_bh(&ct
->lock
);
1677 spin_unlock_bh(&ct
->lock
);
1682 ctnetlink_attach_labels(struct nf_conn
*ct
, const struct nlattr
* const cda
[])
1684 #ifdef CONFIG_NF_CONNTRACK_LABELS
1685 size_t len
= nla_len(cda
[CTA_LABELS
]);
1686 const void *mask
= cda
[CTA_LABELS_MASK
];
1688 if (len
& (sizeof(u32
)-1)) /* must be multiple of u32 */
1692 if (nla_len(cda
[CTA_LABELS_MASK
]) == 0 ||
1693 nla_len(cda
[CTA_LABELS_MASK
]) != len
)
1695 mask
= nla_data(cda
[CTA_LABELS_MASK
]);
1700 return nf_connlabels_replace(ct
, nla_data(cda
[CTA_LABELS
]), mask
, len
);
1707 ctnetlink_change_conntrack(struct nf_conn
*ct
,
1708 const struct nlattr
* const cda
[])
1712 /* only allow NAT changes and master assignation for new conntracks */
1713 if (cda
[CTA_NAT_SRC
] || cda
[CTA_NAT_DST
] || cda
[CTA_TUPLE_MASTER
])
1716 if (cda
[CTA_HELP
]) {
1717 err
= ctnetlink_change_helper(ct
, cda
);
1722 if (cda
[CTA_TIMEOUT
]) {
1723 err
= ctnetlink_change_timeout(ct
, cda
);
1728 if (cda
[CTA_STATUS
]) {
1729 err
= ctnetlink_change_status(ct
, cda
);
1734 if (cda
[CTA_PROTOINFO
]) {
1735 err
= ctnetlink_change_protoinfo(ct
, cda
);
1740 #if defined(CONFIG_NF_CONNTRACK_MARK)
1742 ct
->mark
= ntohl(nla_get_be32(cda
[CTA_MARK
]));
1745 if (cda
[CTA_SEQ_ADJ_ORIG
] || cda
[CTA_SEQ_ADJ_REPLY
]) {
1746 err
= ctnetlink_change_seq_adj(ct
, cda
);
1751 if (cda
[CTA_LABELS
]) {
1752 err
= ctnetlink_attach_labels(ct
, cda
);
1760 static struct nf_conn
*
1761 ctnetlink_create_conntrack(struct net
*net
,
1762 const struct nf_conntrack_zone
*zone
,
1763 const struct nlattr
* const cda
[],
1764 struct nf_conntrack_tuple
*otuple
,
1765 struct nf_conntrack_tuple
*rtuple
,
1770 struct nf_conntrack_helper
*helper
;
1771 struct nf_conn_tstamp
*tstamp
;
1774 ct
= nf_conntrack_alloc(net
, zone
, otuple
, rtuple
, GFP_ATOMIC
);
1776 return ERR_PTR(-ENOMEM
);
1778 if (!cda
[CTA_TIMEOUT
])
1781 timeout
= (u64
)ntohl(nla_get_be32(cda
[CTA_TIMEOUT
])) * HZ
;
1782 if (timeout
> INT_MAX
)
1784 ct
->timeout
= (u32
)timeout
+ nfct_time_stamp
;
1787 if (cda
[CTA_HELP
]) {
1788 char *helpname
= NULL
;
1789 struct nlattr
*helpinfo
= NULL
;
1791 err
= ctnetlink_parse_help(cda
[CTA_HELP
], &helpname
, &helpinfo
);
1795 helper
= __nf_conntrack_helper_find(helpname
, nf_ct_l3num(ct
),
1796 nf_ct_protonum(ct
));
1797 if (helper
== NULL
) {
1799 #ifdef CONFIG_MODULES
1800 if (request_module("nfct-helper-%s", helpname
) < 0) {
1806 helper
= __nf_conntrack_helper_find(helpname
,
1808 nf_ct_protonum(ct
));
1818 struct nf_conn_help
*help
;
1820 help
= nf_ct_helper_ext_add(ct
, helper
, GFP_ATOMIC
);
1825 /* set private helper data if allowed. */
1826 if (helper
->from_nlattr
)
1827 helper
->from_nlattr(helpinfo
, ct
);
1829 /* not in hash table yet so not strictly necessary */
1830 RCU_INIT_POINTER(help
->helper
, helper
);
1833 /* try an implicit helper assignation */
1834 err
= __nf_ct_try_assign_helper(ct
, NULL
, GFP_ATOMIC
);
1839 err
= ctnetlink_setup_nat(ct
, cda
);
1843 nf_ct_acct_ext_add(ct
, GFP_ATOMIC
);
1844 nf_ct_tstamp_ext_add(ct
, GFP_ATOMIC
);
1845 nf_ct_ecache_ext_add(ct
, 0, 0, GFP_ATOMIC
);
1846 nf_ct_labels_ext_add(ct
);
1847 nfct_seqadj_ext_add(ct
);
1848 nfct_synproxy_ext_add(ct
);
1850 /* we must add conntrack extensions before confirmation. */
1851 ct
->status
|= IPS_CONFIRMED
;
1853 if (cda
[CTA_STATUS
]) {
1854 err
= ctnetlink_change_status(ct
, cda
);
1859 if (cda
[CTA_SEQ_ADJ_ORIG
] || cda
[CTA_SEQ_ADJ_REPLY
]) {
1860 err
= ctnetlink_change_seq_adj(ct
, cda
);
1865 memset(&ct
->proto
, 0, sizeof(ct
->proto
));
1866 if (cda
[CTA_PROTOINFO
]) {
1867 err
= ctnetlink_change_protoinfo(ct
, cda
);
1872 #if defined(CONFIG_NF_CONNTRACK_MARK)
1874 ct
->mark
= ntohl(nla_get_be32(cda
[CTA_MARK
]));
1877 /* setup master conntrack: this is a confirmed expectation */
1878 if (cda
[CTA_TUPLE_MASTER
]) {
1879 struct nf_conntrack_tuple master
;
1880 struct nf_conntrack_tuple_hash
*master_h
;
1881 struct nf_conn
*master_ct
;
1883 err
= ctnetlink_parse_tuple(cda
, &master
, CTA_TUPLE_MASTER
,
1888 master_h
= nf_conntrack_find_get(net
, zone
, &master
);
1889 if (master_h
== NULL
) {
1893 master_ct
= nf_ct_tuplehash_to_ctrack(master_h
);
1894 __set_bit(IPS_EXPECTED_BIT
, &ct
->status
);
1895 ct
->master
= master_ct
;
1897 tstamp
= nf_conn_tstamp_find(ct
);
1899 tstamp
->start
= ktime_get_real_ns();
1901 err
= nf_conntrack_hash_check_insert(ct
);
1912 nf_conntrack_free(ct
);
1913 return ERR_PTR(err
);
1916 static int ctnetlink_new_conntrack(struct net
*net
, struct sock
*ctnl
,
1917 struct sk_buff
*skb
,
1918 const struct nlmsghdr
*nlh
,
1919 const struct nlattr
* const cda
[],
1920 struct netlink_ext_ack
*extack
)
1922 struct nf_conntrack_tuple otuple
, rtuple
;
1923 struct nf_conntrack_tuple_hash
*h
= NULL
;
1924 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1926 u_int8_t u3
= nfmsg
->nfgen_family
;
1927 struct nf_conntrack_zone zone
;
1930 err
= ctnetlink_parse_zone(cda
[CTA_ZONE
], &zone
);
1934 if (cda
[CTA_TUPLE_ORIG
]) {
1935 err
= ctnetlink_parse_tuple(cda
, &otuple
, CTA_TUPLE_ORIG
,
1941 if (cda
[CTA_TUPLE_REPLY
]) {
1942 err
= ctnetlink_parse_tuple(cda
, &rtuple
, CTA_TUPLE_REPLY
,
1948 if (cda
[CTA_TUPLE_ORIG
])
1949 h
= nf_conntrack_find_get(net
, &zone
, &otuple
);
1950 else if (cda
[CTA_TUPLE_REPLY
])
1951 h
= nf_conntrack_find_get(net
, &zone
, &rtuple
);
1955 if (nlh
->nlmsg_flags
& NLM_F_CREATE
) {
1956 enum ip_conntrack_events events
;
1958 if (!cda
[CTA_TUPLE_ORIG
] || !cda
[CTA_TUPLE_REPLY
])
1960 if (otuple
.dst
.protonum
!= rtuple
.dst
.protonum
)
1963 ct
= ctnetlink_create_conntrack(net
, &zone
, cda
, &otuple
,
1969 if (test_bit(IPS_EXPECTED_BIT
, &ct
->status
))
1970 events
= 1 << IPCT_RELATED
;
1972 events
= 1 << IPCT_NEW
;
1974 if (cda
[CTA_LABELS
] &&
1975 ctnetlink_attach_labels(ct
, cda
) == 0)
1976 events
|= (1 << IPCT_LABEL
);
1978 nf_conntrack_eventmask_report((1 << IPCT_REPLY
) |
1979 (1 << IPCT_ASSURED
) |
1980 (1 << IPCT_HELPER
) |
1981 (1 << IPCT_PROTOINFO
) |
1982 (1 << IPCT_SEQADJ
) |
1983 (1 << IPCT_MARK
) | events
,
1984 ct
, NETLINK_CB(skb
).portid
,
1991 /* implicit 'else' */
1994 ct
= nf_ct_tuplehash_to_ctrack(h
);
1995 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
)) {
1996 err
= ctnetlink_change_conntrack(ct
, cda
);
1998 nf_conntrack_eventmask_report((1 << IPCT_REPLY
) |
1999 (1 << IPCT_ASSURED
) |
2000 (1 << IPCT_HELPER
) |
2002 (1 << IPCT_PROTOINFO
) |
2003 (1 << IPCT_SEQADJ
) |
2005 ct
, NETLINK_CB(skb
).portid
,
2015 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff
*skb
, u32 portid
, u32 seq
,
2016 __u16 cpu
, const struct ip_conntrack_stat
*st
)
2018 struct nlmsghdr
*nlh
;
2019 struct nfgenmsg
*nfmsg
;
2020 unsigned int flags
= portid
? NLM_F_MULTI
: 0, event
;
2022 event
= nfnl_msg_type(NFNL_SUBSYS_CTNETLINK
,
2023 IPCTNL_MSG_CT_GET_STATS_CPU
);
2024 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*nfmsg
), flags
);
2028 nfmsg
= nlmsg_data(nlh
);
2029 nfmsg
->nfgen_family
= AF_UNSPEC
;
2030 nfmsg
->version
= NFNETLINK_V0
;
2031 nfmsg
->res_id
= htons(cpu
);
2033 if (nla_put_be32(skb
, CTA_STATS_FOUND
, htonl(st
->found
)) ||
2034 nla_put_be32(skb
, CTA_STATS_INVALID
, htonl(st
->invalid
)) ||
2035 nla_put_be32(skb
, CTA_STATS_IGNORE
, htonl(st
->ignore
)) ||
2036 nla_put_be32(skb
, CTA_STATS_INSERT
, htonl(st
->insert
)) ||
2037 nla_put_be32(skb
, CTA_STATS_INSERT_FAILED
,
2038 htonl(st
->insert_failed
)) ||
2039 nla_put_be32(skb
, CTA_STATS_DROP
, htonl(st
->drop
)) ||
2040 nla_put_be32(skb
, CTA_STATS_EARLY_DROP
, htonl(st
->early_drop
)) ||
2041 nla_put_be32(skb
, CTA_STATS_ERROR
, htonl(st
->error
)) ||
2042 nla_put_be32(skb
, CTA_STATS_SEARCH_RESTART
,
2043 htonl(st
->search_restart
)))
2044 goto nla_put_failure
;
2046 nlmsg_end(skb
, nlh
);
2051 nlmsg_cancel(skb
, nlh
);
2056 ctnetlink_ct_stat_cpu_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2059 struct net
*net
= sock_net(skb
->sk
);
2061 if (cb
->args
[0] == nr_cpu_ids
)
2064 for (cpu
= cb
->args
[0]; cpu
< nr_cpu_ids
; cpu
++) {
2065 const struct ip_conntrack_stat
*st
;
2067 if (!cpu_possible(cpu
))
2070 st
= per_cpu_ptr(net
->ct
.stat
, cpu
);
2071 if (ctnetlink_ct_stat_cpu_fill_info(skb
,
2072 NETLINK_CB(cb
->skb
).portid
,
2082 static int ctnetlink_stat_ct_cpu(struct net
*net
, struct sock
*ctnl
,
2083 struct sk_buff
*skb
,
2084 const struct nlmsghdr
*nlh
,
2085 const struct nlattr
* const cda
[],
2086 struct netlink_ext_ack
*extack
)
2088 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2089 struct netlink_dump_control c
= {
2090 .dump
= ctnetlink_ct_stat_cpu_dump
,
2092 return netlink_dump_start(ctnl
, skb
, nlh
, &c
);
2099 ctnetlink_stat_ct_fill_info(struct sk_buff
*skb
, u32 portid
, u32 seq
, u32 type
,
2102 struct nlmsghdr
*nlh
;
2103 struct nfgenmsg
*nfmsg
;
2104 unsigned int flags
= portid
? NLM_F_MULTI
: 0, event
;
2105 unsigned int nr_conntracks
= atomic_read(&net
->ct
.count
);
2107 event
= nfnl_msg_type(NFNL_SUBSYS_CTNETLINK
, IPCTNL_MSG_CT_GET_STATS
);
2108 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*nfmsg
), flags
);
2112 nfmsg
= nlmsg_data(nlh
);
2113 nfmsg
->nfgen_family
= AF_UNSPEC
;
2114 nfmsg
->version
= NFNETLINK_V0
;
2117 if (nla_put_be32(skb
, CTA_STATS_GLOBAL_ENTRIES
, htonl(nr_conntracks
)))
2118 goto nla_put_failure
;
2120 nlmsg_end(skb
, nlh
);
2125 nlmsg_cancel(skb
, nlh
);
2129 static int ctnetlink_stat_ct(struct net
*net
, struct sock
*ctnl
,
2130 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2131 const struct nlattr
* const cda
[],
2132 struct netlink_ext_ack
*extack
)
2134 struct sk_buff
*skb2
;
2137 skb2
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
2141 err
= ctnetlink_stat_ct_fill_info(skb2
, NETLINK_CB(skb
).portid
,
2143 NFNL_MSG_TYPE(nlh
->nlmsg_type
),
2148 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).portid
, MSG_DONTWAIT
);
2157 /* this avoids a loop in nfnetlink. */
2158 return err
== -EAGAIN
? -ENOBUFS
: err
;
2161 static const struct nla_policy exp_nla_policy
[CTA_EXPECT_MAX
+1] = {
2162 [CTA_EXPECT_MASTER
] = { .type
= NLA_NESTED
},
2163 [CTA_EXPECT_TUPLE
] = { .type
= NLA_NESTED
},
2164 [CTA_EXPECT_MASK
] = { .type
= NLA_NESTED
},
2165 [CTA_EXPECT_TIMEOUT
] = { .type
= NLA_U32
},
2166 [CTA_EXPECT_ID
] = { .type
= NLA_U32
},
2167 [CTA_EXPECT_HELP_NAME
] = { .type
= NLA_NUL_STRING
,
2168 .len
= NF_CT_HELPER_NAME_LEN
- 1 },
2169 [CTA_EXPECT_ZONE
] = { .type
= NLA_U16
},
2170 [CTA_EXPECT_FLAGS
] = { .type
= NLA_U32
},
2171 [CTA_EXPECT_CLASS
] = { .type
= NLA_U32
},
2172 [CTA_EXPECT_NAT
] = { .type
= NLA_NESTED
},
2173 [CTA_EXPECT_FN
] = { .type
= NLA_NUL_STRING
},
2176 static struct nf_conntrack_expect
*
2177 ctnetlink_alloc_expect(const struct nlattr
*const cda
[], struct nf_conn
*ct
,
2178 struct nf_conntrack_helper
*helper
,
2179 struct nf_conntrack_tuple
*tuple
,
2180 struct nf_conntrack_tuple
*mask
);
2182 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2184 ctnetlink_glue_build_size(const struct nf_conn
*ct
)
2186 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2187 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2188 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2189 + 3 * nla_total_size(sizeof(u_int8_t
)) /* CTA_PROTO_NUM */
2190 + nla_total_size(sizeof(u_int32_t
)) /* CTA_ID */
2191 + nla_total_size(sizeof(u_int32_t
)) /* CTA_STATUS */
2192 + nla_total_size(sizeof(u_int32_t
)) /* CTA_TIMEOUT */
2193 + nla_total_size(0) /* CTA_PROTOINFO */
2194 + nla_total_size(0) /* CTA_HELP */
2195 + nla_total_size(NF_CT_HELPER_NAME_LEN
) /* CTA_HELP_NAME */
2196 + ctnetlink_secctx_size(ct
)
2197 #ifdef CONFIG_NF_NAT_NEEDED
2198 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2199 + 6 * nla_total_size(sizeof(u_int32_t
)) /* CTA_NAT_SEQ_OFFSET */
2201 #ifdef CONFIG_NF_CONNTRACK_MARK
2202 + nla_total_size(sizeof(u_int32_t
)) /* CTA_MARK */
2204 #ifdef CONFIG_NF_CONNTRACK_ZONES
2205 + nla_total_size(sizeof(u_int16_t
)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2207 + ctnetlink_proto_size(ct
)
2211 static struct nf_conn
*ctnetlink_glue_get_ct(const struct sk_buff
*skb
,
2212 enum ip_conntrack_info
*ctinfo
)
2214 return nf_ct_get(skb
, ctinfo
);
2217 static int __ctnetlink_glue_build(struct sk_buff
*skb
, struct nf_conn
*ct
)
2219 const struct nf_conntrack_zone
*zone
;
2220 struct nlattr
*nest_parms
;
2222 zone
= nf_ct_zone(ct
);
2224 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_ORIG
| NLA_F_NESTED
);
2226 goto nla_put_failure
;
2227 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
2228 goto nla_put_failure
;
2229 if (ctnetlink_dump_zone_id(skb
, CTA_TUPLE_ZONE
, zone
,
2230 NF_CT_ZONE_DIR_ORIG
) < 0)
2231 goto nla_put_failure
;
2232 nla_nest_end(skb
, nest_parms
);
2234 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_REPLY
| NLA_F_NESTED
);
2236 goto nla_put_failure
;
2237 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
2238 goto nla_put_failure
;
2239 if (ctnetlink_dump_zone_id(skb
, CTA_TUPLE_ZONE
, zone
,
2240 NF_CT_ZONE_DIR_REPL
) < 0)
2241 goto nla_put_failure
;
2242 nla_nest_end(skb
, nest_parms
);
2244 if (ctnetlink_dump_zone_id(skb
, CTA_ZONE
, zone
,
2245 NF_CT_DEFAULT_ZONE_DIR
) < 0)
2246 goto nla_put_failure
;
2248 if (ctnetlink_dump_id(skb
, ct
) < 0)
2249 goto nla_put_failure
;
2251 if (ctnetlink_dump_status(skb
, ct
) < 0)
2252 goto nla_put_failure
;
2254 if (ctnetlink_dump_timeout(skb
, ct
) < 0)
2255 goto nla_put_failure
;
2257 if (ctnetlink_dump_protoinfo(skb
, ct
) < 0)
2258 goto nla_put_failure
;
2260 if (ctnetlink_dump_helpinfo(skb
, ct
) < 0)
2261 goto nla_put_failure
;
2263 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2264 if (ct
->secmark
&& ctnetlink_dump_secctx(skb
, ct
) < 0)
2265 goto nla_put_failure
;
2267 if (ct
->master
&& ctnetlink_dump_master(skb
, ct
) < 0)
2268 goto nla_put_failure
;
2270 if ((ct
->status
& IPS_SEQ_ADJUST
) &&
2271 ctnetlink_dump_ct_seq_adj(skb
, ct
) < 0)
2272 goto nla_put_failure
;
2274 #ifdef CONFIG_NF_CONNTRACK_MARK
2275 if (ct
->mark
&& ctnetlink_dump_mark(skb
, ct
) < 0)
2276 goto nla_put_failure
;
2278 if (ctnetlink_dump_labels(skb
, ct
) < 0)
2279 goto nla_put_failure
;
2287 ctnetlink_glue_build(struct sk_buff
*skb
, struct nf_conn
*ct
,
2288 enum ip_conntrack_info ctinfo
,
2289 u_int16_t ct_attr
, u_int16_t ct_info_attr
)
2291 struct nlattr
*nest_parms
;
2293 nest_parms
= nla_nest_start(skb
, ct_attr
| NLA_F_NESTED
);
2295 goto nla_put_failure
;
2297 if (__ctnetlink_glue_build(skb
, ct
) < 0)
2298 goto nla_put_failure
;
2300 nla_nest_end(skb
, nest_parms
);
2302 if (nla_put_be32(skb
, ct_info_attr
, htonl(ctinfo
)))
2303 goto nla_put_failure
;
2312 ctnetlink_update_status(struct nf_conn
*ct
, const struct nlattr
* const cda
[])
2314 unsigned int status
= ntohl(nla_get_be32(cda
[CTA_STATUS
]));
2315 unsigned long d
= ct
->status
^ status
;
2317 if (d
& IPS_SEEN_REPLY
&& !(status
& IPS_SEEN_REPLY
))
2318 /* SEEN_REPLY bit can only be set */
2321 if (d
& IPS_ASSURED
&& !(status
& IPS_ASSURED
))
2322 /* ASSURED bit can only be set */
2325 /* This check is less strict than ctnetlink_change_status()
2326 * because callers often flip IPS_EXPECTED bits when sending
2327 * an NFQA_CT attribute to the kernel. So ignore the
2328 * unchangeable bits but do not error out. Also user programs
2329 * are allowed to clear the bits that they are allowed to change.
2331 __ctnetlink_change_status(ct
, status
, ~status
);
2336 ctnetlink_glue_parse_ct(const struct nlattr
*cda
[], struct nf_conn
*ct
)
2340 if (cda
[CTA_TIMEOUT
]) {
2341 err
= ctnetlink_change_timeout(ct
, cda
);
2345 if (cda
[CTA_STATUS
]) {
2346 err
= ctnetlink_update_status(ct
, cda
);
2350 if (cda
[CTA_HELP
]) {
2351 err
= ctnetlink_change_helper(ct
, cda
);
2355 if (cda
[CTA_LABELS
]) {
2356 err
= ctnetlink_attach_labels(ct
, cda
);
2360 #if defined(CONFIG_NF_CONNTRACK_MARK)
2361 if (cda
[CTA_MARK
]) {
2362 u32 mask
= 0, mark
, newmark
;
2363 if (cda
[CTA_MARK_MASK
])
2364 mask
= ~ntohl(nla_get_be32(cda
[CTA_MARK_MASK
]));
2366 mark
= ntohl(nla_get_be32(cda
[CTA_MARK
]));
2367 newmark
= (ct
->mark
& mask
) ^ mark
;
2368 if (newmark
!= ct
->mark
)
2376 ctnetlink_glue_parse(const struct nlattr
*attr
, struct nf_conn
*ct
)
2378 struct nlattr
*cda
[CTA_MAX
+1];
2381 ret
= nla_parse_nested(cda
, CTA_MAX
, attr
, ct_nla_policy
, NULL
);
2385 return ctnetlink_glue_parse_ct((const struct nlattr
**)cda
, ct
);
2388 static int ctnetlink_glue_exp_parse(const struct nlattr
* const *cda
,
2389 const struct nf_conn
*ct
,
2390 struct nf_conntrack_tuple
*tuple
,
2391 struct nf_conntrack_tuple
*mask
)
2395 err
= ctnetlink_parse_tuple(cda
, tuple
, CTA_EXPECT_TUPLE
,
2396 nf_ct_l3num(ct
), NULL
);
2400 return ctnetlink_parse_tuple(cda
, mask
, CTA_EXPECT_MASK
,
2401 nf_ct_l3num(ct
), NULL
);
2405 ctnetlink_glue_attach_expect(const struct nlattr
*attr
, struct nf_conn
*ct
,
2406 u32 portid
, u32 report
)
2408 struct nlattr
*cda
[CTA_EXPECT_MAX
+1];
2409 struct nf_conntrack_tuple tuple
, mask
;
2410 struct nf_conntrack_helper
*helper
= NULL
;
2411 struct nf_conntrack_expect
*exp
;
2414 err
= nla_parse_nested(cda
, CTA_EXPECT_MAX
, attr
, exp_nla_policy
,
2419 err
= ctnetlink_glue_exp_parse((const struct nlattr
* const *)cda
,
2424 if (cda
[CTA_EXPECT_HELP_NAME
]) {
2425 const char *helpname
= nla_data(cda
[CTA_EXPECT_HELP_NAME
]);
2427 helper
= __nf_conntrack_helper_find(helpname
, nf_ct_l3num(ct
),
2428 nf_ct_protonum(ct
));
2433 exp
= ctnetlink_alloc_expect((const struct nlattr
* const *)cda
, ct
,
2434 helper
, &tuple
, &mask
);
2436 return PTR_ERR(exp
);
2438 err
= nf_ct_expect_related_report(exp
, portid
, report
);
2439 nf_ct_expect_put(exp
);
2443 static void ctnetlink_glue_seqadj(struct sk_buff
*skb
, struct nf_conn
*ct
,
2444 enum ip_conntrack_info ctinfo
, int diff
)
2446 if (!(ct
->status
& IPS_NAT_MASK
))
2449 nf_ct_tcp_seqadj_set(skb
, ct
, ctinfo
, diff
);
2452 static struct nfnl_ct_hook ctnetlink_glue_hook
= {
2453 .get_ct
= ctnetlink_glue_get_ct
,
2454 .build_size
= ctnetlink_glue_build_size
,
2455 .build
= ctnetlink_glue_build
,
2456 .parse
= ctnetlink_glue_parse
,
2457 .attach_expect
= ctnetlink_glue_attach_expect
,
2458 .seq_adjust
= ctnetlink_glue_seqadj
,
2460 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2462 /***********************************************************************
2464 ***********************************************************************/
2466 static int ctnetlink_exp_dump_tuple(struct sk_buff
*skb
,
2467 const struct nf_conntrack_tuple
*tuple
,
2470 struct nlattr
*nest_parms
;
2472 nest_parms
= nla_nest_start(skb
, type
| NLA_F_NESTED
);
2474 goto nla_put_failure
;
2475 if (ctnetlink_dump_tuples(skb
, tuple
) < 0)
2476 goto nla_put_failure
;
2477 nla_nest_end(skb
, nest_parms
);
2485 static int ctnetlink_exp_dump_mask(struct sk_buff
*skb
,
2486 const struct nf_conntrack_tuple
*tuple
,
2487 const struct nf_conntrack_tuple_mask
*mask
)
2489 const struct nf_conntrack_l3proto
*l3proto
;
2490 const struct nf_conntrack_l4proto
*l4proto
;
2491 struct nf_conntrack_tuple m
;
2492 struct nlattr
*nest_parms
;
2495 memset(&m
, 0xFF, sizeof(m
));
2496 memcpy(&m
.src
.u3
, &mask
->src
.u3
, sizeof(m
.src
.u3
));
2497 m
.src
.u
.all
= mask
->src
.u
.all
;
2498 m
.dst
.protonum
= tuple
->dst
.protonum
;
2500 nest_parms
= nla_nest_start(skb
, CTA_EXPECT_MASK
| NLA_F_NESTED
);
2502 goto nla_put_failure
;
2505 l3proto
= __nf_ct_l3proto_find(tuple
->src
.l3num
);
2506 ret
= ctnetlink_dump_tuples_ip(skb
, &m
, l3proto
);
2508 l4proto
= __nf_ct_l4proto_find(tuple
->src
.l3num
,
2509 tuple
->dst
.protonum
);
2510 ret
= ctnetlink_dump_tuples_proto(skb
, &m
, l4proto
);
2514 if (unlikely(ret
< 0))
2515 goto nla_put_failure
;
2517 nla_nest_end(skb
, nest_parms
);
2525 static const union nf_inet_addr any_addr
;
2528 ctnetlink_exp_dump_expect(struct sk_buff
*skb
,
2529 const struct nf_conntrack_expect
*exp
)
2531 struct nf_conn
*master
= exp
->master
;
2532 long timeout
= ((long)exp
->timeout
.expires
- (long)jiffies
) / HZ
;
2533 struct nf_conn_help
*help
;
2534 #ifdef CONFIG_NF_NAT_NEEDED
2535 struct nlattr
*nest_parms
;
2536 struct nf_conntrack_tuple nat_tuple
= {};
2538 struct nf_ct_helper_expectfn
*expfn
;
2543 if (ctnetlink_exp_dump_tuple(skb
, &exp
->tuple
, CTA_EXPECT_TUPLE
) < 0)
2544 goto nla_put_failure
;
2545 if (ctnetlink_exp_dump_mask(skb
, &exp
->tuple
, &exp
->mask
) < 0)
2546 goto nla_put_failure
;
2547 if (ctnetlink_exp_dump_tuple(skb
,
2548 &master
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
,
2549 CTA_EXPECT_MASTER
) < 0)
2550 goto nla_put_failure
;
2552 #ifdef CONFIG_NF_NAT_NEEDED
2553 if (!nf_inet_addr_cmp(&exp
->saved_addr
, &any_addr
) ||
2554 exp
->saved_proto
.all
) {
2555 nest_parms
= nla_nest_start(skb
, CTA_EXPECT_NAT
| NLA_F_NESTED
);
2557 goto nla_put_failure
;
2559 if (nla_put_be32(skb
, CTA_EXPECT_NAT_DIR
, htonl(exp
->dir
)))
2560 goto nla_put_failure
;
2562 nat_tuple
.src
.l3num
= nf_ct_l3num(master
);
2563 nat_tuple
.src
.u3
= exp
->saved_addr
;
2564 nat_tuple
.dst
.protonum
= nf_ct_protonum(master
);
2565 nat_tuple
.src
.u
= exp
->saved_proto
;
2567 if (ctnetlink_exp_dump_tuple(skb
, &nat_tuple
,
2568 CTA_EXPECT_NAT_TUPLE
) < 0)
2569 goto nla_put_failure
;
2570 nla_nest_end(skb
, nest_parms
);
2573 if (nla_put_be32(skb
, CTA_EXPECT_TIMEOUT
, htonl(timeout
)) ||
2574 nla_put_be32(skb
, CTA_EXPECT_ID
, htonl((unsigned long)exp
)) ||
2575 nla_put_be32(skb
, CTA_EXPECT_FLAGS
, htonl(exp
->flags
)) ||
2576 nla_put_be32(skb
, CTA_EXPECT_CLASS
, htonl(exp
->class)))
2577 goto nla_put_failure
;
2578 help
= nfct_help(master
);
2580 struct nf_conntrack_helper
*helper
;
2582 helper
= rcu_dereference(help
->helper
);
2584 nla_put_string(skb
, CTA_EXPECT_HELP_NAME
, helper
->name
))
2585 goto nla_put_failure
;
2587 expfn
= nf_ct_helper_expectfn_find_by_symbol(exp
->expectfn
);
2588 if (expfn
!= NULL
&&
2589 nla_put_string(skb
, CTA_EXPECT_FN
, expfn
->name
))
2590 goto nla_put_failure
;
2599 ctnetlink_exp_fill_info(struct sk_buff
*skb
, u32 portid
, u32 seq
,
2600 int event
, const struct nf_conntrack_expect
*exp
)
2602 struct nlmsghdr
*nlh
;
2603 struct nfgenmsg
*nfmsg
;
2604 unsigned int flags
= portid
? NLM_F_MULTI
: 0;
2606 event
= nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP
, event
);
2607 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*nfmsg
), flags
);
2611 nfmsg
= nlmsg_data(nlh
);
2612 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
2613 nfmsg
->version
= NFNETLINK_V0
;
2616 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
2617 goto nla_put_failure
;
2619 nlmsg_end(skb
, nlh
);
2624 nlmsg_cancel(skb
, nlh
);
2628 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2630 ctnetlink_expect_event(unsigned int events
, struct nf_exp_event
*item
)
2632 struct nf_conntrack_expect
*exp
= item
->exp
;
2633 struct net
*net
= nf_ct_exp_net(exp
);
2634 struct nlmsghdr
*nlh
;
2635 struct nfgenmsg
*nfmsg
;
2636 struct sk_buff
*skb
;
2637 unsigned int type
, group
;
2640 if (events
& (1 << IPEXP_DESTROY
)) {
2641 type
= IPCTNL_MSG_EXP_DELETE
;
2642 group
= NFNLGRP_CONNTRACK_EXP_DESTROY
;
2643 } else if (events
& (1 << IPEXP_NEW
)) {
2644 type
= IPCTNL_MSG_EXP_NEW
;
2645 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
2646 group
= NFNLGRP_CONNTRACK_EXP_NEW
;
2650 if (!item
->report
&& !nfnetlink_has_listeners(net
, group
))
2653 skb
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_ATOMIC
);
2657 type
= nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP
, type
);
2658 nlh
= nlmsg_put(skb
, item
->portid
, 0, type
, sizeof(*nfmsg
), flags
);
2662 nfmsg
= nlmsg_data(nlh
);
2663 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
2664 nfmsg
->version
= NFNETLINK_V0
;
2667 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
2668 goto nla_put_failure
;
2670 nlmsg_end(skb
, nlh
);
2671 nfnetlink_send(skb
, net
, item
->portid
, group
, item
->report
, GFP_ATOMIC
);
2675 nlmsg_cancel(skb
, nlh
);
2679 nfnetlink_set_err(net
, 0, 0, -ENOBUFS
);
2683 static int ctnetlink_exp_done(struct netlink_callback
*cb
)
2686 nf_ct_expect_put((struct nf_conntrack_expect
*)cb
->args
[1]);
2691 ctnetlink_exp_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2693 struct net
*net
= sock_net(skb
->sk
);
2694 struct nf_conntrack_expect
*exp
, *last
;
2695 struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
2696 u_int8_t l3proto
= nfmsg
->nfgen_family
;
2699 last
= (struct nf_conntrack_expect
*)cb
->args
[1];
2700 for (; cb
->args
[0] < nf_ct_expect_hsize
; cb
->args
[0]++) {
2702 hlist_for_each_entry_rcu(exp
, &nf_ct_expect_hash
[cb
->args
[0]],
2704 if (l3proto
&& exp
->tuple
.src
.l3num
!= l3proto
)
2707 if (!net_eq(nf_ct_net(exp
->master
), net
))
2715 if (ctnetlink_exp_fill_info(skb
,
2716 NETLINK_CB(cb
->skb
).portid
,
2720 if (!refcount_inc_not_zero(&exp
->use
))
2722 cb
->args
[1] = (unsigned long)exp
;
2734 nf_ct_expect_put(last
);
2740 ctnetlink_exp_ct_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2742 struct nf_conntrack_expect
*exp
, *last
;
2743 struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
2744 struct nf_conn
*ct
= cb
->data
;
2745 struct nf_conn_help
*help
= nfct_help(ct
);
2746 u_int8_t l3proto
= nfmsg
->nfgen_family
;
2752 last
= (struct nf_conntrack_expect
*)cb
->args
[1];
2754 hlist_for_each_entry_rcu(exp
, &help
->expectations
, lnode
) {
2755 if (l3proto
&& exp
->tuple
.src
.l3num
!= l3proto
)
2762 if (ctnetlink_exp_fill_info(skb
, NETLINK_CB(cb
->skb
).portid
,
2766 if (!refcount_inc_not_zero(&exp
->use
))
2768 cb
->args
[1] = (unsigned long)exp
;
2780 nf_ct_expect_put(last
);
2785 static int ctnetlink_dump_exp_ct(struct net
*net
, struct sock
*ctnl
,
2786 struct sk_buff
*skb
,
2787 const struct nlmsghdr
*nlh
,
2788 const struct nlattr
* const cda
[],
2789 struct netlink_ext_ack
*extack
)
2792 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2793 u_int8_t u3
= nfmsg
->nfgen_family
;
2794 struct nf_conntrack_tuple tuple
;
2795 struct nf_conntrack_tuple_hash
*h
;
2797 struct nf_conntrack_zone zone
;
2798 struct netlink_dump_control c
= {
2799 .dump
= ctnetlink_exp_ct_dump_table
,
2800 .done
= ctnetlink_exp_done
,
2803 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_MASTER
,
2808 err
= ctnetlink_parse_zone(cda
[CTA_EXPECT_ZONE
], &zone
);
2812 h
= nf_conntrack_find_get(net
, &zone
, &tuple
);
2816 ct
= nf_ct_tuplehash_to_ctrack(h
);
2817 /* No expectation linked to this connection tracking. */
2818 if (!nfct_help(ct
)) {
2825 err
= netlink_dump_start(ctnl
, skb
, nlh
, &c
);
2831 static int ctnetlink_get_expect(struct net
*net
, struct sock
*ctnl
,
2832 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2833 const struct nlattr
* const cda
[],
2834 struct netlink_ext_ack
*extack
)
2836 struct nf_conntrack_tuple tuple
;
2837 struct nf_conntrack_expect
*exp
;
2838 struct sk_buff
*skb2
;
2839 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2840 u_int8_t u3
= nfmsg
->nfgen_family
;
2841 struct nf_conntrack_zone zone
;
2844 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2845 if (cda
[CTA_EXPECT_MASTER
])
2846 return ctnetlink_dump_exp_ct(net
, ctnl
, skb
, nlh
, cda
,
2849 struct netlink_dump_control c
= {
2850 .dump
= ctnetlink_exp_dump_table
,
2851 .done
= ctnetlink_exp_done
,
2853 return netlink_dump_start(ctnl
, skb
, nlh
, &c
);
2857 err
= ctnetlink_parse_zone(cda
[CTA_EXPECT_ZONE
], &zone
);
2861 if (cda
[CTA_EXPECT_TUPLE
])
2862 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
,
2864 else if (cda
[CTA_EXPECT_MASTER
])
2865 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_MASTER
,
2873 exp
= nf_ct_expect_find_get(net
, &zone
, &tuple
);
2877 if (cda
[CTA_EXPECT_ID
]) {
2878 __be32 id
= nla_get_be32(cda
[CTA_EXPECT_ID
]);
2879 if (ntohl(id
) != (u32
)(unsigned long)exp
) {
2880 nf_ct_expect_put(exp
);
2886 skb2
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
2888 nf_ct_expect_put(exp
);
2893 err
= ctnetlink_exp_fill_info(skb2
, NETLINK_CB(skb
).portid
,
2894 nlh
->nlmsg_seq
, IPCTNL_MSG_EXP_NEW
, exp
);
2896 nf_ct_expect_put(exp
);
2900 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).portid
, MSG_DONTWAIT
);
2909 /* this avoids a loop in nfnetlink. */
2910 return err
== -EAGAIN
? -ENOBUFS
: err
;
2913 static bool expect_iter_name(struct nf_conntrack_expect
*exp
, void *data
)
2915 const struct nf_conn_help
*m_help
;
2916 const char *name
= data
;
2918 m_help
= nfct_help(exp
->master
);
2920 return strcmp(m_help
->helper
->name
, name
) == 0;
2923 static bool expect_iter_all(struct nf_conntrack_expect
*exp
, void *data
)
2928 static int ctnetlink_del_expect(struct net
*net
, struct sock
*ctnl
,
2929 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2930 const struct nlattr
* const cda
[],
2931 struct netlink_ext_ack
*extack
)
2933 struct nf_conntrack_expect
*exp
;
2934 struct nf_conntrack_tuple tuple
;
2935 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2936 u_int8_t u3
= nfmsg
->nfgen_family
;
2937 struct nf_conntrack_zone zone
;
2940 if (cda
[CTA_EXPECT_TUPLE
]) {
2941 /* delete a single expect by tuple */
2942 err
= ctnetlink_parse_zone(cda
[CTA_EXPECT_ZONE
], &zone
);
2946 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
,
2951 /* bump usage count to 2 */
2952 exp
= nf_ct_expect_find_get(net
, &zone
, &tuple
);
2956 if (cda
[CTA_EXPECT_ID
]) {
2957 __be32 id
= nla_get_be32(cda
[CTA_EXPECT_ID
]);
2958 if (ntohl(id
) != (u32
)(unsigned long)exp
) {
2959 nf_ct_expect_put(exp
);
2964 /* after list removal, usage count == 1 */
2965 spin_lock_bh(&nf_conntrack_expect_lock
);
2966 if (del_timer(&exp
->timeout
)) {
2967 nf_ct_unlink_expect_report(exp
, NETLINK_CB(skb
).portid
,
2969 nf_ct_expect_put(exp
);
2971 spin_unlock_bh(&nf_conntrack_expect_lock
);
2972 /* have to put what we 'get' above.
2973 * after this line usage count == 0 */
2974 nf_ct_expect_put(exp
);
2975 } else if (cda
[CTA_EXPECT_HELP_NAME
]) {
2976 char *name
= nla_data(cda
[CTA_EXPECT_HELP_NAME
]);
2978 nf_ct_expect_iterate_net(net
, expect_iter_name
, name
,
2979 NETLINK_CB(skb
).portid
,
2982 /* This basically means we have to flush everything*/
2983 nf_ct_expect_iterate_net(net
, expect_iter_all
, NULL
,
2984 NETLINK_CB(skb
).portid
,
2991 ctnetlink_change_expect(struct nf_conntrack_expect
*x
,
2992 const struct nlattr
* const cda
[])
2994 if (cda
[CTA_EXPECT_TIMEOUT
]) {
2995 if (!del_timer(&x
->timeout
))
2998 x
->timeout
.expires
= jiffies
+
2999 ntohl(nla_get_be32(cda
[CTA_EXPECT_TIMEOUT
])) * HZ
;
3000 add_timer(&x
->timeout
);
3005 static const struct nla_policy exp_nat_nla_policy
[CTA_EXPECT_NAT_MAX
+1] = {
3006 [CTA_EXPECT_NAT_DIR
] = { .type
= NLA_U32
},
3007 [CTA_EXPECT_NAT_TUPLE
] = { .type
= NLA_NESTED
},
3011 ctnetlink_parse_expect_nat(const struct nlattr
*attr
,
3012 struct nf_conntrack_expect
*exp
,
3015 #ifdef CONFIG_NF_NAT_NEEDED
3016 struct nlattr
*tb
[CTA_EXPECT_NAT_MAX
+1];
3017 struct nf_conntrack_tuple nat_tuple
= {};
3020 err
= nla_parse_nested(tb
, CTA_EXPECT_NAT_MAX
, attr
,
3021 exp_nat_nla_policy
, NULL
);
3025 if (!tb
[CTA_EXPECT_NAT_DIR
] || !tb
[CTA_EXPECT_NAT_TUPLE
])
3028 err
= ctnetlink_parse_tuple((const struct nlattr
* const *)tb
,
3029 &nat_tuple
, CTA_EXPECT_NAT_TUPLE
,
3034 exp
->saved_addr
= nat_tuple
.src
.u3
;
3035 exp
->saved_proto
= nat_tuple
.src
.u
;
3036 exp
->dir
= ntohl(nla_get_be32(tb
[CTA_EXPECT_NAT_DIR
]));
3044 static struct nf_conntrack_expect
*
3045 ctnetlink_alloc_expect(const struct nlattr
* const cda
[], struct nf_conn
*ct
,
3046 struct nf_conntrack_helper
*helper
,
3047 struct nf_conntrack_tuple
*tuple
,
3048 struct nf_conntrack_tuple
*mask
)
3050 u_int32_t
class = 0;
3051 struct nf_conntrack_expect
*exp
;
3052 struct nf_conn_help
*help
;
3055 help
= nfct_help(ct
);
3057 return ERR_PTR(-EOPNOTSUPP
);
3059 if (cda
[CTA_EXPECT_CLASS
] && helper
) {
3060 class = ntohl(nla_get_be32(cda
[CTA_EXPECT_CLASS
]));
3061 if (class > helper
->expect_class_max
)
3062 return ERR_PTR(-EINVAL
);
3064 exp
= nf_ct_expect_alloc(ct
);
3066 return ERR_PTR(-ENOMEM
);
3068 if (cda
[CTA_EXPECT_FLAGS
]) {
3069 exp
->flags
= ntohl(nla_get_be32(cda
[CTA_EXPECT_FLAGS
]));
3070 exp
->flags
&= ~NF_CT_EXPECT_USERSPACE
;
3074 if (cda
[CTA_EXPECT_FN
]) {
3075 const char *name
= nla_data(cda
[CTA_EXPECT_FN
]);
3076 struct nf_ct_helper_expectfn
*expfn
;
3078 expfn
= nf_ct_helper_expectfn_find_by_name(name
);
3079 if (expfn
== NULL
) {
3083 exp
->expectfn
= expfn
->expectfn
;
3085 exp
->expectfn
= NULL
;
3089 exp
->helper
= helper
;
3090 exp
->tuple
= *tuple
;
3091 exp
->mask
.src
.u3
= mask
->src
.u3
;
3092 exp
->mask
.src
.u
.all
= mask
->src
.u
.all
;
3094 if (cda
[CTA_EXPECT_NAT
]) {
3095 err
= ctnetlink_parse_expect_nat(cda
[CTA_EXPECT_NAT
],
3096 exp
, nf_ct_l3num(ct
));
3102 nf_ct_expect_put(exp
);
3103 return ERR_PTR(err
);
3107 ctnetlink_create_expect(struct net
*net
,
3108 const struct nf_conntrack_zone
*zone
,
3109 const struct nlattr
* const cda
[],
3110 u_int8_t u3
, u32 portid
, int report
)
3112 struct nf_conntrack_tuple tuple
, mask
, master_tuple
;
3113 struct nf_conntrack_tuple_hash
*h
= NULL
;
3114 struct nf_conntrack_helper
*helper
= NULL
;
3115 struct nf_conntrack_expect
*exp
;
3119 /* caller guarantees that those three CTA_EXPECT_* exist */
3120 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
,
3124 err
= ctnetlink_parse_tuple(cda
, &mask
, CTA_EXPECT_MASK
,
3128 err
= ctnetlink_parse_tuple(cda
, &master_tuple
, CTA_EXPECT_MASTER
,
3133 /* Look for master conntrack of this expectation */
3134 h
= nf_conntrack_find_get(net
, zone
, &master_tuple
);
3137 ct
= nf_ct_tuplehash_to_ctrack(h
);
3140 if (cda
[CTA_EXPECT_HELP_NAME
]) {
3141 const char *helpname
= nla_data(cda
[CTA_EXPECT_HELP_NAME
]);
3143 helper
= __nf_conntrack_helper_find(helpname
, u3
,
3144 nf_ct_protonum(ct
));
3145 if (helper
== NULL
) {
3147 #ifdef CONFIG_MODULES
3148 if (request_module("nfct-helper-%s", helpname
) < 0) {
3153 helper
= __nf_conntrack_helper_find(helpname
, u3
,
3154 nf_ct_protonum(ct
));
3166 exp
= ctnetlink_alloc_expect(cda
, ct
, helper
, &tuple
, &mask
);
3172 err
= nf_ct_expect_related_report(exp
, portid
, report
);
3173 nf_ct_expect_put(exp
);
3181 static int ctnetlink_new_expect(struct net
*net
, struct sock
*ctnl
,
3182 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
3183 const struct nlattr
* const cda
[],
3184 struct netlink_ext_ack
*extack
)
3186 struct nf_conntrack_tuple tuple
;
3187 struct nf_conntrack_expect
*exp
;
3188 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
3189 u_int8_t u3
= nfmsg
->nfgen_family
;
3190 struct nf_conntrack_zone zone
;
3193 if (!cda
[CTA_EXPECT_TUPLE
]
3194 || !cda
[CTA_EXPECT_MASK
]
3195 || !cda
[CTA_EXPECT_MASTER
])
3198 err
= ctnetlink_parse_zone(cda
[CTA_EXPECT_ZONE
], &zone
);
3202 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
,
3207 spin_lock_bh(&nf_conntrack_expect_lock
);
3208 exp
= __nf_ct_expect_find(net
, &zone
, &tuple
);
3210 spin_unlock_bh(&nf_conntrack_expect_lock
);
3212 if (nlh
->nlmsg_flags
& NLM_F_CREATE
) {
3213 err
= ctnetlink_create_expect(net
, &zone
, cda
, u3
,
3214 NETLINK_CB(skb
).portid
,
3221 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
3222 err
= ctnetlink_change_expect(exp
, cda
);
3223 spin_unlock_bh(&nf_conntrack_expect_lock
);
3229 ctnetlink_exp_stat_fill_info(struct sk_buff
*skb
, u32 portid
, u32 seq
, int cpu
,
3230 const struct ip_conntrack_stat
*st
)
3232 struct nlmsghdr
*nlh
;
3233 struct nfgenmsg
*nfmsg
;
3234 unsigned int flags
= portid
? NLM_F_MULTI
: 0, event
;
3236 event
= nfnl_msg_type(NFNL_SUBSYS_CTNETLINK
,
3237 IPCTNL_MSG_EXP_GET_STATS_CPU
);
3238 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*nfmsg
), flags
);
3242 nfmsg
= nlmsg_data(nlh
);
3243 nfmsg
->nfgen_family
= AF_UNSPEC
;
3244 nfmsg
->version
= NFNETLINK_V0
;
3245 nfmsg
->res_id
= htons(cpu
);
3247 if (nla_put_be32(skb
, CTA_STATS_EXP_NEW
, htonl(st
->expect_new
)) ||
3248 nla_put_be32(skb
, CTA_STATS_EXP_CREATE
, htonl(st
->expect_create
)) ||
3249 nla_put_be32(skb
, CTA_STATS_EXP_DELETE
, htonl(st
->expect_delete
)))
3250 goto nla_put_failure
;
3252 nlmsg_end(skb
, nlh
);
3257 nlmsg_cancel(skb
, nlh
);
3262 ctnetlink_exp_stat_cpu_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
)
3265 struct net
*net
= sock_net(skb
->sk
);
3267 if (cb
->args
[0] == nr_cpu_ids
)
3270 for (cpu
= cb
->args
[0]; cpu
< nr_cpu_ids
; cpu
++) {
3271 const struct ip_conntrack_stat
*st
;
3273 if (!cpu_possible(cpu
))
3276 st
= per_cpu_ptr(net
->ct
.stat
, cpu
);
3277 if (ctnetlink_exp_stat_fill_info(skb
, NETLINK_CB(cb
->skb
).portid
,
3287 static int ctnetlink_stat_exp_cpu(struct net
*net
, struct sock
*ctnl
,
3288 struct sk_buff
*skb
,
3289 const struct nlmsghdr
*nlh
,
3290 const struct nlattr
* const cda
[],
3291 struct netlink_ext_ack
*extack
)
3293 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
3294 struct netlink_dump_control c
= {
3295 .dump
= ctnetlink_exp_stat_cpu_dump
,
3297 return netlink_dump_start(ctnl
, skb
, nlh
, &c
);
3303 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3304 static struct nf_ct_event_notifier ctnl_notifier
= {
3305 .fcn
= ctnetlink_conntrack_event
,
3308 static struct nf_exp_event_notifier ctnl_notifier_exp
= {
3309 .fcn
= ctnetlink_expect_event
,
3313 static const struct nfnl_callback ctnl_cb
[IPCTNL_MSG_MAX
] = {
3314 [IPCTNL_MSG_CT_NEW
] = { .call
= ctnetlink_new_conntrack
,
3315 .attr_count
= CTA_MAX
,
3316 .policy
= ct_nla_policy
},
3317 [IPCTNL_MSG_CT_GET
] = { .call
= ctnetlink_get_conntrack
,
3318 .attr_count
= CTA_MAX
,
3319 .policy
= ct_nla_policy
},
3320 [IPCTNL_MSG_CT_DELETE
] = { .call
= ctnetlink_del_conntrack
,
3321 .attr_count
= CTA_MAX
,
3322 .policy
= ct_nla_policy
},
3323 [IPCTNL_MSG_CT_GET_CTRZERO
] = { .call
= ctnetlink_get_conntrack
,
3324 .attr_count
= CTA_MAX
,
3325 .policy
= ct_nla_policy
},
3326 [IPCTNL_MSG_CT_GET_STATS_CPU
] = { .call
= ctnetlink_stat_ct_cpu
},
3327 [IPCTNL_MSG_CT_GET_STATS
] = { .call
= ctnetlink_stat_ct
},
3328 [IPCTNL_MSG_CT_GET_DYING
] = { .call
= ctnetlink_get_ct_dying
},
3329 [IPCTNL_MSG_CT_GET_UNCONFIRMED
] = { .call
= ctnetlink_get_ct_unconfirmed
},
3332 static const struct nfnl_callback ctnl_exp_cb
[IPCTNL_MSG_EXP_MAX
] = {
3333 [IPCTNL_MSG_EXP_GET
] = { .call
= ctnetlink_get_expect
,
3334 .attr_count
= CTA_EXPECT_MAX
,
3335 .policy
= exp_nla_policy
},
3336 [IPCTNL_MSG_EXP_NEW
] = { .call
= ctnetlink_new_expect
,
3337 .attr_count
= CTA_EXPECT_MAX
,
3338 .policy
= exp_nla_policy
},
3339 [IPCTNL_MSG_EXP_DELETE
] = { .call
= ctnetlink_del_expect
,
3340 .attr_count
= CTA_EXPECT_MAX
,
3341 .policy
= exp_nla_policy
},
3342 [IPCTNL_MSG_EXP_GET_STATS_CPU
] = { .call
= ctnetlink_stat_exp_cpu
},
3345 static const struct nfnetlink_subsystem ctnl_subsys
= {
3346 .name
= "conntrack",
3347 .subsys_id
= NFNL_SUBSYS_CTNETLINK
,
3348 .cb_count
= IPCTNL_MSG_MAX
,
3352 static const struct nfnetlink_subsystem ctnl_exp_subsys
= {
3353 .name
= "conntrack_expect",
3354 .subsys_id
= NFNL_SUBSYS_CTNETLINK_EXP
,
3355 .cb_count
= IPCTNL_MSG_EXP_MAX
,
3359 MODULE_ALIAS("ip_conntrack_netlink");
3360 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK
);
3361 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP
);
3363 static int __net_init
ctnetlink_net_init(struct net
*net
)
3365 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3368 ret
= nf_conntrack_register_notifier(net
, &ctnl_notifier
);
3370 pr_err("ctnetlink_init: cannot register notifier.\n");
3374 ret
= nf_ct_expect_register_notifier(net
, &ctnl_notifier_exp
);
3376 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3377 goto err_unreg_notifier
;
3382 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3384 nf_conntrack_unregister_notifier(net
, &ctnl_notifier
);
3390 static void ctnetlink_net_exit(struct net
*net
)
3392 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3393 nf_ct_expect_unregister_notifier(net
, &ctnl_notifier_exp
);
3394 nf_conntrack_unregister_notifier(net
, &ctnl_notifier
);
3398 static void __net_exit
ctnetlink_net_exit_batch(struct list_head
*net_exit_list
)
3402 list_for_each_entry(net
, net_exit_list
, exit_list
)
3403 ctnetlink_net_exit(net
);
3406 static struct pernet_operations ctnetlink_net_ops
= {
3407 .init
= ctnetlink_net_init
,
3408 .exit_batch
= ctnetlink_net_exit_batch
,
3411 static int __init
ctnetlink_init(void)
3415 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version
);
3416 ret
= nfnetlink_subsys_register(&ctnl_subsys
);
3418 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3422 ret
= nfnetlink_subsys_register(&ctnl_exp_subsys
);
3424 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3425 goto err_unreg_subsys
;
3428 ret
= register_pernet_subsys(&ctnetlink_net_ops
);
3430 pr_err("ctnetlink_init: cannot register pernet operations\n");
3431 goto err_unreg_exp_subsys
;
3433 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3434 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3435 RCU_INIT_POINTER(nfnl_ct_hook
, &ctnetlink_glue_hook
);
3439 err_unreg_exp_subsys
:
3440 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
3442 nfnetlink_subsys_unregister(&ctnl_subsys
);
3447 static void __exit
ctnetlink_exit(void)
3449 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3451 unregister_pernet_subsys(&ctnetlink_net_ops
);
3452 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
3453 nfnetlink_subsys_unregister(&ctnl_subsys
);
3454 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3455 RCU_INIT_POINTER(nfnl_ct_hook
, NULL
);
3460 module_init(ctnetlink_init
);
3461 module_exit(ctnetlink_exit
);