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_seqadj.h>
49 #include <net/netfilter/nf_conntrack_synproxy.h>
50 #ifdef CONFIG_NF_NAT_NEEDED
51 #include <net/netfilter/nf_nat_core.h>
52 #include <net/netfilter/nf_nat_l4proto.h>
53 #include <net/netfilter/nf_nat_helper.h>
56 #include <linux/netfilter/nfnetlink.h>
57 #include <linux/netfilter/nfnetlink_conntrack.h>
59 MODULE_LICENSE("GPL");
61 static char __initdata version
[] = "0.93";
63 static int ctnetlink_dump_tuples_proto(struct sk_buff
*skb
,
64 const struct nf_conntrack_tuple
*tuple
,
65 struct nf_conntrack_l4proto
*l4proto
)
68 struct nlattr
*nest_parms
;
70 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_PROTO
| NLA_F_NESTED
);
73 if (nla_put_u8(skb
, CTA_PROTO_NUM
, tuple
->dst
.protonum
))
76 if (likely(l4proto
->tuple_to_nlattr
))
77 ret
= l4proto
->tuple_to_nlattr(skb
, tuple
);
79 nla_nest_end(skb
, nest_parms
);
87 static int ctnetlink_dump_tuples_ip(struct sk_buff
*skb
,
88 const struct nf_conntrack_tuple
*tuple
,
89 struct nf_conntrack_l3proto
*l3proto
)
92 struct nlattr
*nest_parms
;
94 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_IP
| NLA_F_NESTED
);
98 if (likely(l3proto
->tuple_to_nlattr
))
99 ret
= l3proto
->tuple_to_nlattr(skb
, tuple
);
101 nla_nest_end(skb
, nest_parms
);
109 static int ctnetlink_dump_tuples(struct sk_buff
*skb
,
110 const struct nf_conntrack_tuple
*tuple
)
113 struct nf_conntrack_l3proto
*l3proto
;
114 struct nf_conntrack_l4proto
*l4proto
;
117 l3proto
= __nf_ct_l3proto_find(tuple
->src
.l3num
);
118 ret
= ctnetlink_dump_tuples_ip(skb
, tuple
, l3proto
);
121 l4proto
= __nf_ct_l4proto_find(tuple
->src
.l3num
,
122 tuple
->dst
.protonum
);
123 ret
= ctnetlink_dump_tuples_proto(skb
, tuple
, l4proto
);
129 static int ctnetlink_dump_zone_id(struct sk_buff
*skb
, int attrtype
,
130 const struct nf_conntrack_zone
*zone
, int dir
)
132 if (zone
->id
== NF_CT_DEFAULT_ZONE_ID
|| zone
->dir
!= dir
)
134 if (nla_put_be16(skb
, attrtype
, htons(zone
->id
)))
135 goto nla_put_failure
;
142 static int ctnetlink_dump_status(struct sk_buff
*skb
, const struct nf_conn
*ct
)
144 if (nla_put_be32(skb
, CTA_STATUS
, htonl(ct
->status
)))
145 goto nla_put_failure
;
152 static int ctnetlink_dump_timeout(struct sk_buff
*skb
, const struct nf_conn
*ct
)
154 long timeout
= nf_ct_expires(ct
) / HZ
;
156 if (nla_put_be32(skb
, CTA_TIMEOUT
, htonl(timeout
)))
157 goto nla_put_failure
;
164 static int ctnetlink_dump_protoinfo(struct sk_buff
*skb
, struct nf_conn
*ct
)
166 struct nf_conntrack_l4proto
*l4proto
;
167 struct nlattr
*nest_proto
;
170 l4proto
= __nf_ct_l4proto_find(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
171 if (!l4proto
->to_nlattr
)
174 nest_proto
= nla_nest_start(skb
, CTA_PROTOINFO
| NLA_F_NESTED
);
176 goto nla_put_failure
;
178 ret
= l4proto
->to_nlattr(skb
, nest_proto
, ct
);
180 nla_nest_end(skb
, nest_proto
);
188 static int ctnetlink_dump_helpinfo(struct sk_buff
*skb
,
189 const struct nf_conn
*ct
)
191 struct nlattr
*nest_helper
;
192 const struct nf_conn_help
*help
= nfct_help(ct
);
193 struct nf_conntrack_helper
*helper
;
198 helper
= rcu_dereference(help
->helper
);
202 nest_helper
= nla_nest_start(skb
, CTA_HELP
| NLA_F_NESTED
);
204 goto nla_put_failure
;
205 if (nla_put_string(skb
, CTA_HELP_NAME
, helper
->name
))
206 goto nla_put_failure
;
208 if (helper
->to_nlattr
)
209 helper
->to_nlattr(skb
, ct
);
211 nla_nest_end(skb
, nest_helper
);
220 dump_counters(struct sk_buff
*skb
, struct nf_conn_acct
*acct
,
221 enum ip_conntrack_dir dir
, int type
)
223 enum ctattr_type attr
= dir
? CTA_COUNTERS_REPLY
: CTA_COUNTERS_ORIG
;
224 struct nf_conn_counter
*counter
= acct
->counter
;
225 struct nlattr
*nest_count
;
228 if (type
== IPCTNL_MSG_CT_GET_CTRZERO
) {
229 pkts
= atomic64_xchg(&counter
[dir
].packets
, 0);
230 bytes
= atomic64_xchg(&counter
[dir
].bytes
, 0);
232 pkts
= atomic64_read(&counter
[dir
].packets
);
233 bytes
= atomic64_read(&counter
[dir
].bytes
);
236 nest_count
= nla_nest_start(skb
, attr
| NLA_F_NESTED
);
238 goto nla_put_failure
;
240 if (nla_put_be64(skb
, CTA_COUNTERS_PACKETS
, cpu_to_be64(pkts
),
242 nla_put_be64(skb
, CTA_COUNTERS_BYTES
, cpu_to_be64(bytes
),
244 goto nla_put_failure
;
246 nla_nest_end(skb
, nest_count
);
255 ctnetlink_dump_acct(struct sk_buff
*skb
, const struct nf_conn
*ct
, int type
)
257 struct nf_conn_acct
*acct
= nf_conn_acct_find(ct
);
262 if (dump_counters(skb
, acct
, IP_CT_DIR_ORIGINAL
, type
) < 0)
264 if (dump_counters(skb
, acct
, IP_CT_DIR_REPLY
, type
) < 0)
271 ctnetlink_dump_timestamp(struct sk_buff
*skb
, const struct nf_conn
*ct
)
273 struct nlattr
*nest_count
;
274 const struct nf_conn_tstamp
*tstamp
;
276 tstamp
= nf_conn_tstamp_find(ct
);
280 nest_count
= nla_nest_start(skb
, CTA_TIMESTAMP
| NLA_F_NESTED
);
282 goto nla_put_failure
;
284 if (nla_put_be64(skb
, CTA_TIMESTAMP_START
, cpu_to_be64(tstamp
->start
),
285 CTA_TIMESTAMP_PAD
) ||
286 (tstamp
->stop
!= 0 && nla_put_be64(skb
, CTA_TIMESTAMP_STOP
,
287 cpu_to_be64(tstamp
->stop
),
289 goto nla_put_failure
;
290 nla_nest_end(skb
, nest_count
);
298 #ifdef CONFIG_NF_CONNTRACK_MARK
299 static int ctnetlink_dump_mark(struct sk_buff
*skb
, const struct nf_conn
*ct
)
301 if (nla_put_be32(skb
, CTA_MARK
, htonl(ct
->mark
)))
302 goto nla_put_failure
;
309 #define ctnetlink_dump_mark(a, b) (0)
312 #ifdef CONFIG_NF_CONNTRACK_SECMARK
313 static int ctnetlink_dump_secctx(struct sk_buff
*skb
, const struct nf_conn
*ct
)
315 struct nlattr
*nest_secctx
;
319 ret
= security_secid_to_secctx(ct
->secmark
, &secctx
, &len
);
324 nest_secctx
= nla_nest_start(skb
, CTA_SECCTX
| NLA_F_NESTED
);
326 goto nla_put_failure
;
328 if (nla_put_string(skb
, CTA_SECCTX_NAME
, secctx
))
329 goto nla_put_failure
;
330 nla_nest_end(skb
, nest_secctx
);
334 security_release_secctx(secctx
, len
);
338 #define ctnetlink_dump_secctx(a, b) (0)
341 #ifdef CONFIG_NF_CONNTRACK_LABELS
342 static inline int ctnetlink_label_size(const struct nf_conn
*ct
)
344 struct nf_conn_labels
*labels
= nf_ct_labels_find(ct
);
348 return nla_total_size(sizeof(labels
->bits
));
352 ctnetlink_dump_labels(struct sk_buff
*skb
, const struct nf_conn
*ct
)
354 struct nf_conn_labels
*labels
= nf_ct_labels_find(ct
);
362 if (labels
->bits
[i
] != 0)
363 return nla_put(skb
, CTA_LABELS
, sizeof(labels
->bits
),
366 } while (i
< ARRAY_SIZE(labels
->bits
));
371 #define ctnetlink_dump_labels(a, b) (0)
372 #define ctnetlink_label_size(a) (0)
375 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
377 static int ctnetlink_dump_master(struct sk_buff
*skb
, const struct nf_conn
*ct
)
379 struct nlattr
*nest_parms
;
381 if (!(ct
->status
& IPS_EXPECTED
))
384 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_MASTER
| NLA_F_NESTED
);
386 goto nla_put_failure
;
387 if (ctnetlink_dump_tuples(skb
, master_tuple(ct
)) < 0)
388 goto nla_put_failure
;
389 nla_nest_end(skb
, nest_parms
);
398 dump_ct_seq_adj(struct sk_buff
*skb
, const struct nf_ct_seqadj
*seq
, int type
)
400 struct nlattr
*nest_parms
;
402 nest_parms
= nla_nest_start(skb
, type
| NLA_F_NESTED
);
404 goto nla_put_failure
;
406 if (nla_put_be32(skb
, CTA_SEQADJ_CORRECTION_POS
,
407 htonl(seq
->correction_pos
)) ||
408 nla_put_be32(skb
, CTA_SEQADJ_OFFSET_BEFORE
,
409 htonl(seq
->offset_before
)) ||
410 nla_put_be32(skb
, CTA_SEQADJ_OFFSET_AFTER
,
411 htonl(seq
->offset_after
)))
412 goto nla_put_failure
;
414 nla_nest_end(skb
, nest_parms
);
422 static int ctnetlink_dump_ct_seq_adj(struct sk_buff
*skb
, struct nf_conn
*ct
)
424 struct nf_conn_seqadj
*seqadj
= nfct_seqadj(ct
);
425 struct nf_ct_seqadj
*seq
;
427 if (!(ct
->status
& IPS_SEQ_ADJUST
) || !seqadj
)
430 spin_lock_bh(&ct
->lock
);
431 seq
= &seqadj
->seq
[IP_CT_DIR_ORIGINAL
];
432 if (dump_ct_seq_adj(skb
, seq
, CTA_SEQ_ADJ_ORIG
) == -1)
435 seq
= &seqadj
->seq
[IP_CT_DIR_REPLY
];
436 if (dump_ct_seq_adj(skb
, seq
, CTA_SEQ_ADJ_REPLY
) == -1)
439 spin_unlock_bh(&ct
->lock
);
442 spin_unlock_bh(&ct
->lock
);
446 static int ctnetlink_dump_id(struct sk_buff
*skb
, const struct nf_conn
*ct
)
448 if (nla_put_be32(skb
, CTA_ID
, htonl((unsigned long)ct
)))
449 goto nla_put_failure
;
456 static int ctnetlink_dump_use(struct sk_buff
*skb
, const struct nf_conn
*ct
)
458 if (nla_put_be32(skb
, CTA_USE
, htonl(atomic_read(&ct
->ct_general
.use
))))
459 goto nla_put_failure
;
467 ctnetlink_fill_info(struct sk_buff
*skb
, u32 portid
, u32 seq
, u32 type
,
470 const struct nf_conntrack_zone
*zone
;
471 struct nlmsghdr
*nlh
;
472 struct nfgenmsg
*nfmsg
;
473 struct nlattr
*nest_parms
;
474 unsigned int flags
= portid
? NLM_F_MULTI
: 0, event
;
476 event
= nfnl_msg_type(NFNL_SUBSYS_CTNETLINK
, IPCTNL_MSG_CT_NEW
);
477 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*nfmsg
), flags
);
481 nfmsg
= nlmsg_data(nlh
);
482 nfmsg
->nfgen_family
= nf_ct_l3num(ct
);
483 nfmsg
->version
= NFNETLINK_V0
;
486 zone
= nf_ct_zone(ct
);
488 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_ORIG
| NLA_F_NESTED
);
490 goto nla_put_failure
;
491 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
492 goto nla_put_failure
;
493 if (ctnetlink_dump_zone_id(skb
, CTA_TUPLE_ZONE
, zone
,
494 NF_CT_ZONE_DIR_ORIG
) < 0)
495 goto nla_put_failure
;
496 nla_nest_end(skb
, nest_parms
);
498 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_REPLY
| NLA_F_NESTED
);
500 goto nla_put_failure
;
501 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
502 goto nla_put_failure
;
503 if (ctnetlink_dump_zone_id(skb
, CTA_TUPLE_ZONE
, zone
,
504 NF_CT_ZONE_DIR_REPL
) < 0)
505 goto nla_put_failure
;
506 nla_nest_end(skb
, nest_parms
);
508 if (ctnetlink_dump_zone_id(skb
, CTA_ZONE
, zone
,
509 NF_CT_DEFAULT_ZONE_DIR
) < 0)
510 goto nla_put_failure
;
512 if (ctnetlink_dump_status(skb
, ct
) < 0 ||
513 ctnetlink_dump_timeout(skb
, ct
) < 0 ||
514 ctnetlink_dump_acct(skb
, ct
, type
) < 0 ||
515 ctnetlink_dump_timestamp(skb
, ct
) < 0 ||
516 ctnetlink_dump_protoinfo(skb
, ct
) < 0 ||
517 ctnetlink_dump_helpinfo(skb
, ct
) < 0 ||
518 ctnetlink_dump_mark(skb
, ct
) < 0 ||
519 ctnetlink_dump_secctx(skb
, ct
) < 0 ||
520 ctnetlink_dump_labels(skb
, ct
) < 0 ||
521 ctnetlink_dump_id(skb
, ct
) < 0 ||
522 ctnetlink_dump_use(skb
, ct
) < 0 ||
523 ctnetlink_dump_master(skb
, ct
) < 0 ||
524 ctnetlink_dump_ct_seq_adj(skb
, ct
) < 0)
525 goto nla_put_failure
;
532 nlmsg_cancel(skb
, nlh
);
536 static inline size_t ctnetlink_proto_size(const struct nf_conn
*ct
)
538 struct nf_conntrack_l3proto
*l3proto
;
539 struct nf_conntrack_l4proto
*l4proto
;
543 l3proto
= __nf_ct_l3proto_find(nf_ct_l3num(ct
));
544 len
+= l3proto
->nla_size
;
546 l4proto
= __nf_ct_l4proto_find(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
547 len
+= l4proto
->nla_size
;
553 static inline size_t ctnetlink_acct_size(const struct nf_conn
*ct
)
555 if (!nf_ct_ext_exist(ct
, NF_CT_EXT_ACCT
))
557 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
558 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
559 + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
563 static inline int ctnetlink_secctx_size(const struct nf_conn
*ct
)
565 #ifdef CONFIG_NF_CONNTRACK_SECMARK
568 ret
= security_secid_to_secctx(ct
->secmark
, NULL
, &len
);
572 return nla_total_size(0) /* CTA_SECCTX */
573 + nla_total_size(sizeof(char) * len
); /* CTA_SECCTX_NAME */
579 static inline size_t ctnetlink_timestamp_size(const struct nf_conn
*ct
)
581 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
582 if (!nf_ct_ext_exist(ct
, NF_CT_EXT_TSTAMP
))
584 return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
590 #ifdef CONFIG_NF_CONNTRACK_EVENTS
591 static size_t ctnetlink_nlmsg_size(const struct nf_conn
*ct
)
593 return NLMSG_ALIGN(sizeof(struct nfgenmsg
))
594 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
595 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
596 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
597 + 3 * nla_total_size(sizeof(u_int8_t
)) /* CTA_PROTO_NUM */
598 + nla_total_size(sizeof(u_int32_t
)) /* CTA_ID */
599 + nla_total_size(sizeof(u_int32_t
)) /* CTA_STATUS */
600 + ctnetlink_acct_size(ct
)
601 + ctnetlink_timestamp_size(ct
)
602 + nla_total_size(sizeof(u_int32_t
)) /* CTA_TIMEOUT */
603 + nla_total_size(0) /* CTA_PROTOINFO */
604 + nla_total_size(0) /* CTA_HELP */
605 + nla_total_size(NF_CT_HELPER_NAME_LEN
) /* CTA_HELP_NAME */
606 + ctnetlink_secctx_size(ct
)
607 #ifdef CONFIG_NF_NAT_NEEDED
608 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
609 + 6 * nla_total_size(sizeof(u_int32_t
)) /* CTA_NAT_SEQ_OFFSET */
611 #ifdef CONFIG_NF_CONNTRACK_MARK
612 + nla_total_size(sizeof(u_int32_t
)) /* CTA_MARK */
614 #ifdef CONFIG_NF_CONNTRACK_ZONES
615 + nla_total_size(sizeof(u_int16_t
)) /* CTA_ZONE|CTA_TUPLE_ZONE */
617 + ctnetlink_proto_size(ct
)
618 + ctnetlink_label_size(ct
)
623 ctnetlink_conntrack_event(unsigned int events
, struct nf_ct_event
*item
)
625 const struct nf_conntrack_zone
*zone
;
627 struct nlmsghdr
*nlh
;
628 struct nfgenmsg
*nfmsg
;
629 struct nlattr
*nest_parms
;
630 struct nf_conn
*ct
= item
->ct
;
633 unsigned int flags
= 0, group
;
636 if (events
& (1 << IPCT_DESTROY
)) {
637 type
= IPCTNL_MSG_CT_DELETE
;
638 group
= NFNLGRP_CONNTRACK_DESTROY
;
639 } else if (events
& ((1 << IPCT_NEW
) | (1 << IPCT_RELATED
))) {
640 type
= IPCTNL_MSG_CT_NEW
;
641 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
642 group
= NFNLGRP_CONNTRACK_NEW
;
644 type
= IPCTNL_MSG_CT_NEW
;
645 group
= NFNLGRP_CONNTRACK_UPDATE
;
650 if (!item
->report
&& !nfnetlink_has_listeners(net
, group
))
653 skb
= nlmsg_new(ctnetlink_nlmsg_size(ct
), GFP_ATOMIC
);
657 type
= nfnl_msg_type(NFNL_SUBSYS_CTNETLINK
, type
);
658 nlh
= nlmsg_put(skb
, item
->portid
, 0, type
, sizeof(*nfmsg
), flags
);
662 nfmsg
= nlmsg_data(nlh
);
663 nfmsg
->nfgen_family
= nf_ct_l3num(ct
);
664 nfmsg
->version
= NFNETLINK_V0
;
668 zone
= nf_ct_zone(ct
);
670 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_ORIG
| NLA_F_NESTED
);
672 goto nla_put_failure
;
673 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
674 goto nla_put_failure
;
675 if (ctnetlink_dump_zone_id(skb
, CTA_TUPLE_ZONE
, zone
,
676 NF_CT_ZONE_DIR_ORIG
) < 0)
677 goto nla_put_failure
;
678 nla_nest_end(skb
, nest_parms
);
680 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_REPLY
| NLA_F_NESTED
);
682 goto nla_put_failure
;
683 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
684 goto nla_put_failure
;
685 if (ctnetlink_dump_zone_id(skb
, CTA_TUPLE_ZONE
, zone
,
686 NF_CT_ZONE_DIR_REPL
) < 0)
687 goto nla_put_failure
;
688 nla_nest_end(skb
, nest_parms
);
690 if (ctnetlink_dump_zone_id(skb
, CTA_ZONE
, zone
,
691 NF_CT_DEFAULT_ZONE_DIR
) < 0)
692 goto nla_put_failure
;
694 if (ctnetlink_dump_id(skb
, ct
) < 0)
695 goto nla_put_failure
;
697 if (ctnetlink_dump_status(skb
, ct
) < 0)
698 goto nla_put_failure
;
700 if (events
& (1 << IPCT_DESTROY
)) {
701 if (ctnetlink_dump_acct(skb
, ct
, type
) < 0 ||
702 ctnetlink_dump_timestamp(skb
, ct
) < 0)
703 goto nla_put_failure
;
705 if (ctnetlink_dump_timeout(skb
, ct
) < 0)
706 goto nla_put_failure
;
708 if (events
& (1 << IPCT_PROTOINFO
)
709 && ctnetlink_dump_protoinfo(skb
, ct
) < 0)
710 goto nla_put_failure
;
712 if ((events
& (1 << IPCT_HELPER
) || nfct_help(ct
))
713 && ctnetlink_dump_helpinfo(skb
, ct
) < 0)
714 goto nla_put_failure
;
716 #ifdef CONFIG_NF_CONNTRACK_SECMARK
717 if ((events
& (1 << IPCT_SECMARK
) || ct
->secmark
)
718 && ctnetlink_dump_secctx(skb
, ct
) < 0)
719 goto nla_put_failure
;
721 if (events
& (1 << IPCT_LABEL
) &&
722 ctnetlink_dump_labels(skb
, ct
) < 0)
723 goto nla_put_failure
;
725 if (events
& (1 << IPCT_RELATED
) &&
726 ctnetlink_dump_master(skb
, ct
) < 0)
727 goto nla_put_failure
;
729 if (events
& (1 << IPCT_SEQADJ
) &&
730 ctnetlink_dump_ct_seq_adj(skb
, ct
) < 0)
731 goto nla_put_failure
;
734 #ifdef CONFIG_NF_CONNTRACK_MARK
735 if ((events
& (1 << IPCT_MARK
) || ct
->mark
)
736 && ctnetlink_dump_mark(skb
, ct
) < 0)
737 goto nla_put_failure
;
742 err
= nfnetlink_send(skb
, net
, item
->portid
, group
, item
->report
,
744 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
;
898 if (nf_ct_should_gc(nf_ct_evict
[i
]))
899 nf_ct_kill(nf_ct_evict
[i
]);
900 nf_ct_put(nf_ct_evict
[i
]);
906 static int ctnetlink_parse_tuple_ip(struct nlattr
*attr
,
907 struct nf_conntrack_tuple
*tuple
)
909 struct nlattr
*tb
[CTA_IP_MAX
+1];
910 struct nf_conntrack_l3proto
*l3proto
;
913 ret
= nla_parse_nested(tb
, CTA_IP_MAX
, attr
, NULL
, NULL
);
918 l3proto
= __nf_ct_l3proto_find(tuple
->src
.l3num
);
920 if (likely(l3proto
->nlattr_to_tuple
)) {
921 ret
= nla_validate_nested(attr
, CTA_IP_MAX
,
922 l3proto
->nla_policy
, NULL
);
924 ret
= l3proto
->nlattr_to_tuple(tb
, tuple
);
932 static const struct nla_policy proto_nla_policy
[CTA_PROTO_MAX
+1] = {
933 [CTA_PROTO_NUM
] = { .type
= NLA_U8
},
936 static int ctnetlink_parse_tuple_proto(struct nlattr
*attr
,
937 struct nf_conntrack_tuple
*tuple
)
939 struct nlattr
*tb
[CTA_PROTO_MAX
+1];
940 struct nf_conntrack_l4proto
*l4proto
;
943 ret
= nla_parse_nested(tb
, CTA_PROTO_MAX
, attr
, proto_nla_policy
,
948 if (!tb
[CTA_PROTO_NUM
])
950 tuple
->dst
.protonum
= nla_get_u8(tb
[CTA_PROTO_NUM
]);
953 l4proto
= __nf_ct_l4proto_find(tuple
->src
.l3num
, tuple
->dst
.protonum
);
955 if (likely(l4proto
->nlattr_to_tuple
)) {
956 ret
= nla_validate_nested(attr
, CTA_PROTO_MAX
,
957 l4proto
->nla_policy
, NULL
);
959 ret
= l4proto
->nlattr_to_tuple(tb
, tuple
);
968 ctnetlink_parse_zone(const struct nlattr
*attr
,
969 struct nf_conntrack_zone
*zone
)
971 nf_ct_zone_init(zone
, NF_CT_DEFAULT_ZONE_ID
,
972 NF_CT_DEFAULT_ZONE_DIR
, 0);
973 #ifdef CONFIG_NF_CONNTRACK_ZONES
975 zone
->id
= ntohs(nla_get_be16(attr
));
984 ctnetlink_parse_tuple_zone(struct nlattr
*attr
, enum ctattr_type type
,
985 struct nf_conntrack_zone
*zone
)
989 if (zone
->id
!= NF_CT_DEFAULT_ZONE_ID
)
992 ret
= ctnetlink_parse_zone(attr
, zone
);
996 if (type
== CTA_TUPLE_REPLY
)
997 zone
->dir
= NF_CT_ZONE_DIR_REPL
;
999 zone
->dir
= NF_CT_ZONE_DIR_ORIG
;
1004 static const struct nla_policy tuple_nla_policy
[CTA_TUPLE_MAX
+1] = {
1005 [CTA_TUPLE_IP
] = { .type
= NLA_NESTED
},
1006 [CTA_TUPLE_PROTO
] = { .type
= NLA_NESTED
},
1007 [CTA_TUPLE_ZONE
] = { .type
= NLA_U16
},
1011 ctnetlink_parse_tuple(const struct nlattr
* const cda
[],
1012 struct nf_conntrack_tuple
*tuple
, u32 type
,
1013 u_int8_t l3num
, struct nf_conntrack_zone
*zone
)
1015 struct nlattr
*tb
[CTA_TUPLE_MAX
+1];
1018 memset(tuple
, 0, sizeof(*tuple
));
1020 err
= nla_parse_nested(tb
, CTA_TUPLE_MAX
, cda
[type
], tuple_nla_policy
,
1025 if (!tb
[CTA_TUPLE_IP
])
1028 tuple
->src
.l3num
= l3num
;
1030 err
= ctnetlink_parse_tuple_ip(tb
[CTA_TUPLE_IP
], tuple
);
1034 if (!tb
[CTA_TUPLE_PROTO
])
1037 err
= ctnetlink_parse_tuple_proto(tb
[CTA_TUPLE_PROTO
], tuple
);
1041 if (tb
[CTA_TUPLE_ZONE
]) {
1045 err
= ctnetlink_parse_tuple_zone(tb
[CTA_TUPLE_ZONE
],
1051 /* orig and expect tuples get DIR_ORIGINAL */
1052 if (type
== CTA_TUPLE_REPLY
)
1053 tuple
->dst
.dir
= IP_CT_DIR_REPLY
;
1055 tuple
->dst
.dir
= IP_CT_DIR_ORIGINAL
;
1060 static const struct nla_policy help_nla_policy
[CTA_HELP_MAX
+1] = {
1061 [CTA_HELP_NAME
] = { .type
= NLA_NUL_STRING
,
1062 .len
= NF_CT_HELPER_NAME_LEN
- 1 },
1065 static int ctnetlink_parse_help(const struct nlattr
*attr
, char **helper_name
,
1066 struct nlattr
**helpinfo
)
1069 struct nlattr
*tb
[CTA_HELP_MAX
+1];
1071 err
= nla_parse_nested(tb
, CTA_HELP_MAX
, attr
, help_nla_policy
, NULL
);
1075 if (!tb
[CTA_HELP_NAME
])
1078 *helper_name
= nla_data(tb
[CTA_HELP_NAME
]);
1080 if (tb
[CTA_HELP_INFO
])
1081 *helpinfo
= tb
[CTA_HELP_INFO
];
1086 static const struct nla_policy ct_nla_policy
[CTA_MAX
+1] = {
1087 [CTA_TUPLE_ORIG
] = { .type
= NLA_NESTED
},
1088 [CTA_TUPLE_REPLY
] = { .type
= NLA_NESTED
},
1089 [CTA_STATUS
] = { .type
= NLA_U32
},
1090 [CTA_PROTOINFO
] = { .type
= NLA_NESTED
},
1091 [CTA_HELP
] = { .type
= NLA_NESTED
},
1092 [CTA_NAT_SRC
] = { .type
= NLA_NESTED
},
1093 [CTA_TIMEOUT
] = { .type
= NLA_U32
},
1094 [CTA_MARK
] = { .type
= NLA_U32
},
1095 [CTA_ID
] = { .type
= NLA_U32
},
1096 [CTA_NAT_DST
] = { .type
= NLA_NESTED
},
1097 [CTA_TUPLE_MASTER
] = { .type
= NLA_NESTED
},
1098 [CTA_NAT_SEQ_ADJ_ORIG
] = { .type
= NLA_NESTED
},
1099 [CTA_NAT_SEQ_ADJ_REPLY
] = { .type
= NLA_NESTED
},
1100 [CTA_ZONE
] = { .type
= NLA_U16
},
1101 [CTA_MARK_MASK
] = { .type
= NLA_U32
},
1102 [CTA_LABELS
] = { .type
= NLA_BINARY
,
1103 .len
= NF_CT_LABELS_MAX_SIZE
},
1104 [CTA_LABELS_MASK
] = { .type
= NLA_BINARY
,
1105 .len
= NF_CT_LABELS_MAX_SIZE
},
1108 static int ctnetlink_flush_conntrack(struct net
*net
,
1109 const struct nlattr
* const cda
[],
1110 u32 portid
, int report
)
1112 struct ctnetlink_filter
*filter
= NULL
;
1114 if (cda
[CTA_MARK
] && cda
[CTA_MARK_MASK
]) {
1115 filter
= ctnetlink_alloc_filter(cda
);
1117 return PTR_ERR(filter
);
1120 nf_ct_iterate_cleanup(net
, ctnetlink_filter_match
, filter
,
1127 static int ctnetlink_del_conntrack(struct net
*net
, struct sock
*ctnl
,
1128 struct sk_buff
*skb
,
1129 const struct nlmsghdr
*nlh
,
1130 const struct nlattr
* const cda
[])
1132 struct nf_conntrack_tuple_hash
*h
;
1133 struct nf_conntrack_tuple tuple
;
1135 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1136 u_int8_t u3
= nfmsg
->nfgen_family
;
1137 struct nf_conntrack_zone zone
;
1140 err
= ctnetlink_parse_zone(cda
[CTA_ZONE
], &zone
);
1144 if (cda
[CTA_TUPLE_ORIG
])
1145 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
,
1147 else if (cda
[CTA_TUPLE_REPLY
])
1148 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
,
1151 return ctnetlink_flush_conntrack(net
, cda
,
1152 NETLINK_CB(skb
).portid
,
1159 h
= nf_conntrack_find_get(net
, &zone
, &tuple
);
1163 ct
= nf_ct_tuplehash_to_ctrack(h
);
1166 u_int32_t id
= ntohl(nla_get_be32(cda
[CTA_ID
]));
1167 if (id
!= (u32
)(unsigned long)ct
) {
1173 nf_ct_delete(ct
, NETLINK_CB(skb
).portid
, nlmsg_report(nlh
));
1179 static int ctnetlink_get_conntrack(struct net
*net
, struct sock
*ctnl
,
1180 struct sk_buff
*skb
,
1181 const struct nlmsghdr
*nlh
,
1182 const struct nlattr
* const cda
[])
1184 struct nf_conntrack_tuple_hash
*h
;
1185 struct nf_conntrack_tuple tuple
;
1187 struct sk_buff
*skb2
= NULL
;
1188 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1189 u_int8_t u3
= nfmsg
->nfgen_family
;
1190 struct nf_conntrack_zone zone
;
1193 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1194 struct netlink_dump_control c
= {
1195 .dump
= ctnetlink_dump_table
,
1196 .done
= ctnetlink_done
,
1199 if (cda
[CTA_MARK
] && cda
[CTA_MARK_MASK
]) {
1200 struct ctnetlink_filter
*filter
;
1202 filter
= ctnetlink_alloc_filter(cda
);
1204 return PTR_ERR(filter
);
1208 return netlink_dump_start(ctnl
, skb
, nlh
, &c
);
1211 err
= ctnetlink_parse_zone(cda
[CTA_ZONE
], &zone
);
1215 if (cda
[CTA_TUPLE_ORIG
])
1216 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_ORIG
,
1218 else if (cda
[CTA_TUPLE_REPLY
])
1219 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_TUPLE_REPLY
,
1227 h
= nf_conntrack_find_get(net
, &zone
, &tuple
);
1231 ct
= nf_ct_tuplehash_to_ctrack(h
);
1234 skb2
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
1241 err
= ctnetlink_fill_info(skb2
, NETLINK_CB(skb
).portid
, nlh
->nlmsg_seq
,
1242 NFNL_MSG_TYPE(nlh
->nlmsg_type
), ct
);
1248 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).portid
, MSG_DONTWAIT
);
1257 /* this avoids a loop in nfnetlink. */
1258 return err
== -EAGAIN
? -ENOBUFS
: err
;
1261 static int ctnetlink_done_list(struct netlink_callback
*cb
)
1264 nf_ct_put((struct nf_conn
*)cb
->args
[1]);
1269 ctnetlink_dump_list(struct sk_buff
*skb
, struct netlink_callback
*cb
, bool dying
)
1271 struct nf_conn
*ct
, *last
;
1272 struct nf_conntrack_tuple_hash
*h
;
1273 struct hlist_nulls_node
*n
;
1274 struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
1275 u_int8_t l3proto
= nfmsg
->nfgen_family
;
1278 struct hlist_nulls_head
*list
;
1279 struct net
*net
= sock_net(skb
->sk
);
1284 last
= (struct nf_conn
*)cb
->args
[1];
1286 for (cpu
= cb
->args
[0]; cpu
< nr_cpu_ids
; cpu
++) {
1287 struct ct_pcpu
*pcpu
;
1289 if (!cpu_possible(cpu
))
1292 pcpu
= per_cpu_ptr(net
->ct
.pcpu_lists
, cpu
);
1293 spin_lock_bh(&pcpu
->lock
);
1294 list
= dying
? &pcpu
->dying
: &pcpu
->unconfirmed
;
1296 hlist_nulls_for_each_entry(h
, n
, list
, hnnode
) {
1297 ct
= nf_ct_tuplehash_to_ctrack(h
);
1298 if (l3proto
&& nf_ct_l3num(ct
) != l3proto
)
1306 res
= ctnetlink_fill_info(skb
, NETLINK_CB(cb
->skb
).portid
,
1308 NFNL_MSG_TYPE(cb
->nlh
->nlmsg_type
),
1312 if (!atomic_inc_not_zero(&ct
->ct_general
.use
))
1315 cb
->args
[1] = (unsigned long)ct
;
1316 spin_unlock_bh(&pcpu
->lock
);
1324 spin_unlock_bh(&pcpu
->lock
);
1335 ctnetlink_dump_dying(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1337 return ctnetlink_dump_list(skb
, cb
, true);
1340 static int ctnetlink_get_ct_dying(struct net
*net
, struct sock
*ctnl
,
1341 struct sk_buff
*skb
,
1342 const struct nlmsghdr
*nlh
,
1343 const struct nlattr
* const cda
[])
1345 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1346 struct netlink_dump_control c
= {
1347 .dump
= ctnetlink_dump_dying
,
1348 .done
= ctnetlink_done_list
,
1350 return netlink_dump_start(ctnl
, skb
, nlh
, &c
);
1357 ctnetlink_dump_unconfirmed(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1359 return ctnetlink_dump_list(skb
, cb
, false);
1362 static int ctnetlink_get_ct_unconfirmed(struct net
*net
, struct sock
*ctnl
,
1363 struct sk_buff
*skb
,
1364 const struct nlmsghdr
*nlh
,
1365 const struct nlattr
* const cda
[])
1367 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1368 struct netlink_dump_control c
= {
1369 .dump
= ctnetlink_dump_unconfirmed
,
1370 .done
= ctnetlink_done_list
,
1372 return netlink_dump_start(ctnl
, skb
, nlh
, &c
);
1378 #ifdef CONFIG_NF_NAT_NEEDED
1380 ctnetlink_parse_nat_setup(struct nf_conn
*ct
,
1381 enum nf_nat_manip_type manip
,
1382 const struct nlattr
*attr
)
1384 typeof(nfnetlink_parse_nat_setup_hook
) parse_nat_setup
;
1387 parse_nat_setup
= rcu_dereference(nfnetlink_parse_nat_setup_hook
);
1388 if (!parse_nat_setup
) {
1389 #ifdef CONFIG_MODULES
1391 nfnl_unlock(NFNL_SUBSYS_CTNETLINK
);
1392 if (request_module("nf-nat") < 0) {
1393 nfnl_lock(NFNL_SUBSYS_CTNETLINK
);
1397 nfnl_lock(NFNL_SUBSYS_CTNETLINK
);
1399 if (nfnetlink_parse_nat_setup_hook
)
1405 err
= parse_nat_setup(ct
, manip
, attr
);
1406 if (err
== -EAGAIN
) {
1407 #ifdef CONFIG_MODULES
1409 nfnl_unlock(NFNL_SUBSYS_CTNETLINK
);
1410 if (request_module("nf-nat-%u", nf_ct_l3num(ct
)) < 0) {
1411 nfnl_lock(NFNL_SUBSYS_CTNETLINK
);
1415 nfnl_lock(NFNL_SUBSYS_CTNETLINK
);
1426 __ctnetlink_change_status(struct nf_conn
*ct
, unsigned long on
,
1431 /* Ignore these unchangable bits */
1432 on
&= ~IPS_UNCHANGEABLE_MASK
;
1433 off
&= ~IPS_UNCHANGEABLE_MASK
;
1435 for (bit
= 0; bit
< __IPS_MAX_BIT
; bit
++) {
1436 if (on
& (1 << bit
))
1437 set_bit(bit
, &ct
->status
);
1438 else if (off
& (1 << bit
))
1439 clear_bit(bit
, &ct
->status
);
1444 ctnetlink_change_status(struct nf_conn
*ct
, const struct nlattr
* const cda
[])
1447 unsigned int status
= ntohl(nla_get_be32(cda
[CTA_STATUS
]));
1448 d
= ct
->status
^ status
;
1450 if (d
& (IPS_EXPECTED
|IPS_CONFIRMED
|IPS_DYING
))
1454 if (d
& IPS_SEEN_REPLY
&& !(status
& IPS_SEEN_REPLY
))
1455 /* SEEN_REPLY bit can only be set */
1458 if (d
& IPS_ASSURED
&& !(status
& IPS_ASSURED
))
1459 /* ASSURED bit can only be set */
1462 __ctnetlink_change_status(ct
, status
, 0);
1467 ctnetlink_setup_nat(struct nf_conn
*ct
, const struct nlattr
* const cda
[])
1469 #ifdef CONFIG_NF_NAT_NEEDED
1472 if (!cda
[CTA_NAT_DST
] && !cda
[CTA_NAT_SRC
])
1475 ret
= ctnetlink_parse_nat_setup(ct
, NF_NAT_MANIP_DST
,
1480 ret
= ctnetlink_parse_nat_setup(ct
, NF_NAT_MANIP_SRC
,
1484 if (!cda
[CTA_NAT_DST
] && !cda
[CTA_NAT_SRC
])
1490 static int ctnetlink_change_helper(struct nf_conn
*ct
,
1491 const struct nlattr
* const cda
[])
1493 struct nf_conntrack_helper
*helper
;
1494 struct nf_conn_help
*help
= nfct_help(ct
);
1495 char *helpname
= NULL
;
1496 struct nlattr
*helpinfo
= NULL
;
1499 err
= ctnetlink_parse_help(cda
[CTA_HELP
], &helpname
, &helpinfo
);
1503 /* don't change helper of sibling connections */
1505 /* If we try to change the helper to the same thing twice,
1506 * treat the second attempt as a no-op instead of returning
1512 helper
= rcu_dereference(help
->helper
);
1513 if (helper
&& !strcmp(helper
->name
, helpname
))
1521 if (!strcmp(helpname
, "")) {
1522 if (help
&& help
->helper
) {
1523 /* we had a helper before ... */
1524 nf_ct_remove_expectations(ct
);
1525 RCU_INIT_POINTER(help
->helper
, NULL
);
1532 helper
= __nf_conntrack_helper_find(helpname
, nf_ct_l3num(ct
),
1533 nf_ct_protonum(ct
));
1534 if (helper
== NULL
) {
1540 if (help
->helper
== helper
) {
1541 /* update private helper data if allowed. */
1542 if (helper
->from_nlattr
)
1543 helper
->from_nlattr(helpinfo
, ct
);
1548 /* we cannot set a helper for an existing conntrack */
1556 static int ctnetlink_change_timeout(struct nf_conn
*ct
,
1557 const struct nlattr
* const cda
[])
1559 u_int32_t timeout
= ntohl(nla_get_be32(cda
[CTA_TIMEOUT
]));
1561 ct
->timeout
= nfct_time_stamp
+ timeout
* HZ
;
1563 if (test_bit(IPS_DYING_BIT
, &ct
->status
))
1569 static const struct nla_policy protoinfo_policy
[CTA_PROTOINFO_MAX
+1] = {
1570 [CTA_PROTOINFO_TCP
] = { .type
= NLA_NESTED
},
1571 [CTA_PROTOINFO_DCCP
] = { .type
= NLA_NESTED
},
1572 [CTA_PROTOINFO_SCTP
] = { .type
= NLA_NESTED
},
1575 static int ctnetlink_change_protoinfo(struct nf_conn
*ct
,
1576 const struct nlattr
* const cda
[])
1578 const struct nlattr
*attr
= cda
[CTA_PROTOINFO
];
1579 struct nlattr
*tb
[CTA_PROTOINFO_MAX
+1];
1580 struct nf_conntrack_l4proto
*l4proto
;
1583 err
= nla_parse_nested(tb
, CTA_PROTOINFO_MAX
, attr
, protoinfo_policy
,
1589 l4proto
= __nf_ct_l4proto_find(nf_ct_l3num(ct
), nf_ct_protonum(ct
));
1590 if (l4proto
->from_nlattr
)
1591 err
= l4proto
->from_nlattr(tb
, ct
);
1597 static const struct nla_policy seqadj_policy
[CTA_SEQADJ_MAX
+1] = {
1598 [CTA_SEQADJ_CORRECTION_POS
] = { .type
= NLA_U32
},
1599 [CTA_SEQADJ_OFFSET_BEFORE
] = { .type
= NLA_U32
},
1600 [CTA_SEQADJ_OFFSET_AFTER
] = { .type
= NLA_U32
},
1603 static int change_seq_adj(struct nf_ct_seqadj
*seq
,
1604 const struct nlattr
* const attr
)
1607 struct nlattr
*cda
[CTA_SEQADJ_MAX
+1];
1609 err
= nla_parse_nested(cda
, CTA_SEQADJ_MAX
, attr
, seqadj_policy
, NULL
);
1613 if (!cda
[CTA_SEQADJ_CORRECTION_POS
])
1616 seq
->correction_pos
=
1617 ntohl(nla_get_be32(cda
[CTA_SEQADJ_CORRECTION_POS
]));
1619 if (!cda
[CTA_SEQADJ_OFFSET_BEFORE
])
1622 seq
->offset_before
=
1623 ntohl(nla_get_be32(cda
[CTA_SEQADJ_OFFSET_BEFORE
]));
1625 if (!cda
[CTA_SEQADJ_OFFSET_AFTER
])
1629 ntohl(nla_get_be32(cda
[CTA_SEQADJ_OFFSET_AFTER
]));
1635 ctnetlink_change_seq_adj(struct nf_conn
*ct
,
1636 const struct nlattr
* const cda
[])
1638 struct nf_conn_seqadj
*seqadj
= nfct_seqadj(ct
);
1644 spin_lock_bh(&ct
->lock
);
1645 if (cda
[CTA_SEQ_ADJ_ORIG
]) {
1646 ret
= change_seq_adj(&seqadj
->seq
[IP_CT_DIR_ORIGINAL
],
1647 cda
[CTA_SEQ_ADJ_ORIG
]);
1651 set_bit(IPS_SEQ_ADJUST_BIT
, &ct
->status
);
1654 if (cda
[CTA_SEQ_ADJ_REPLY
]) {
1655 ret
= change_seq_adj(&seqadj
->seq
[IP_CT_DIR_REPLY
],
1656 cda
[CTA_SEQ_ADJ_REPLY
]);
1660 set_bit(IPS_SEQ_ADJUST_BIT
, &ct
->status
);
1663 spin_unlock_bh(&ct
->lock
);
1666 spin_unlock_bh(&ct
->lock
);
1671 ctnetlink_attach_labels(struct nf_conn
*ct
, const struct nlattr
* const cda
[])
1673 #ifdef CONFIG_NF_CONNTRACK_LABELS
1674 size_t len
= nla_len(cda
[CTA_LABELS
]);
1675 const void *mask
= cda
[CTA_LABELS_MASK
];
1677 if (len
& (sizeof(u32
)-1)) /* must be multiple of u32 */
1681 if (nla_len(cda
[CTA_LABELS_MASK
]) == 0 ||
1682 nla_len(cda
[CTA_LABELS_MASK
]) != len
)
1684 mask
= nla_data(cda
[CTA_LABELS_MASK
]);
1689 return nf_connlabels_replace(ct
, nla_data(cda
[CTA_LABELS
]), mask
, len
);
1696 ctnetlink_change_conntrack(struct nf_conn
*ct
,
1697 const struct nlattr
* const cda
[])
1701 /* only allow NAT changes and master assignation for new conntracks */
1702 if (cda
[CTA_NAT_SRC
] || cda
[CTA_NAT_DST
] || cda
[CTA_TUPLE_MASTER
])
1705 if (cda
[CTA_HELP
]) {
1706 err
= ctnetlink_change_helper(ct
, cda
);
1711 if (cda
[CTA_TIMEOUT
]) {
1712 err
= ctnetlink_change_timeout(ct
, cda
);
1717 if (cda
[CTA_STATUS
]) {
1718 err
= ctnetlink_change_status(ct
, cda
);
1723 if (cda
[CTA_PROTOINFO
]) {
1724 err
= ctnetlink_change_protoinfo(ct
, cda
);
1729 #if defined(CONFIG_NF_CONNTRACK_MARK)
1731 ct
->mark
= ntohl(nla_get_be32(cda
[CTA_MARK
]));
1734 if (cda
[CTA_SEQ_ADJ_ORIG
] || cda
[CTA_SEQ_ADJ_REPLY
]) {
1735 err
= ctnetlink_change_seq_adj(ct
, cda
);
1740 if (cda
[CTA_LABELS
]) {
1741 err
= ctnetlink_attach_labels(ct
, cda
);
1749 static struct nf_conn
*
1750 ctnetlink_create_conntrack(struct net
*net
,
1751 const struct nf_conntrack_zone
*zone
,
1752 const struct nlattr
* const cda
[],
1753 struct nf_conntrack_tuple
*otuple
,
1754 struct nf_conntrack_tuple
*rtuple
,
1759 struct nf_conntrack_helper
*helper
;
1760 struct nf_conn_tstamp
*tstamp
;
1762 ct
= nf_conntrack_alloc(net
, zone
, otuple
, rtuple
, GFP_ATOMIC
);
1764 return ERR_PTR(-ENOMEM
);
1766 if (!cda
[CTA_TIMEOUT
])
1769 ct
->timeout
= nfct_time_stamp
+ ntohl(nla_get_be32(cda
[CTA_TIMEOUT
])) * HZ
;
1772 if (cda
[CTA_HELP
]) {
1773 char *helpname
= NULL
;
1774 struct nlattr
*helpinfo
= NULL
;
1776 err
= ctnetlink_parse_help(cda
[CTA_HELP
], &helpname
, &helpinfo
);
1780 helper
= __nf_conntrack_helper_find(helpname
, nf_ct_l3num(ct
),
1781 nf_ct_protonum(ct
));
1782 if (helper
== NULL
) {
1784 #ifdef CONFIG_MODULES
1785 if (request_module("nfct-helper-%s", helpname
) < 0) {
1791 helper
= __nf_conntrack_helper_find(helpname
,
1793 nf_ct_protonum(ct
));
1803 struct nf_conn_help
*help
;
1805 help
= nf_ct_helper_ext_add(ct
, helper
, GFP_ATOMIC
);
1810 /* set private helper data if allowed. */
1811 if (helper
->from_nlattr
)
1812 helper
->from_nlattr(helpinfo
, ct
);
1814 /* not in hash table yet so not strictly necessary */
1815 RCU_INIT_POINTER(help
->helper
, helper
);
1818 /* try an implicit helper assignation */
1819 err
= __nf_ct_try_assign_helper(ct
, NULL
, GFP_ATOMIC
);
1824 err
= ctnetlink_setup_nat(ct
, cda
);
1828 nf_ct_acct_ext_add(ct
, GFP_ATOMIC
);
1829 nf_ct_tstamp_ext_add(ct
, GFP_ATOMIC
);
1830 nf_ct_ecache_ext_add(ct
, 0, 0, GFP_ATOMIC
);
1831 nf_ct_labels_ext_add(ct
);
1832 nfct_seqadj_ext_add(ct
);
1833 nfct_synproxy_ext_add(ct
);
1835 /* we must add conntrack extensions before confirmation. */
1836 ct
->status
|= IPS_CONFIRMED
;
1838 if (cda
[CTA_STATUS
]) {
1839 err
= ctnetlink_change_status(ct
, cda
);
1844 if (cda
[CTA_SEQ_ADJ_ORIG
] || cda
[CTA_SEQ_ADJ_REPLY
]) {
1845 err
= ctnetlink_change_seq_adj(ct
, cda
);
1850 memset(&ct
->proto
, 0, sizeof(ct
->proto
));
1851 if (cda
[CTA_PROTOINFO
]) {
1852 err
= ctnetlink_change_protoinfo(ct
, cda
);
1857 #if defined(CONFIG_NF_CONNTRACK_MARK)
1859 ct
->mark
= ntohl(nla_get_be32(cda
[CTA_MARK
]));
1862 /* setup master conntrack: this is a confirmed expectation */
1863 if (cda
[CTA_TUPLE_MASTER
]) {
1864 struct nf_conntrack_tuple master
;
1865 struct nf_conntrack_tuple_hash
*master_h
;
1866 struct nf_conn
*master_ct
;
1868 err
= ctnetlink_parse_tuple(cda
, &master
, CTA_TUPLE_MASTER
,
1873 master_h
= nf_conntrack_find_get(net
, zone
, &master
);
1874 if (master_h
== NULL
) {
1878 master_ct
= nf_ct_tuplehash_to_ctrack(master_h
);
1879 __set_bit(IPS_EXPECTED_BIT
, &ct
->status
);
1880 ct
->master
= master_ct
;
1882 tstamp
= nf_conn_tstamp_find(ct
);
1884 tstamp
->start
= ktime_get_real_ns();
1886 err
= nf_conntrack_hash_check_insert(ct
);
1897 nf_conntrack_free(ct
);
1898 return ERR_PTR(err
);
1901 static int ctnetlink_new_conntrack(struct net
*net
, struct sock
*ctnl
,
1902 struct sk_buff
*skb
,
1903 const struct nlmsghdr
*nlh
,
1904 const struct nlattr
* const cda
[])
1906 struct nf_conntrack_tuple otuple
, rtuple
;
1907 struct nf_conntrack_tuple_hash
*h
= NULL
;
1908 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1910 u_int8_t u3
= nfmsg
->nfgen_family
;
1911 struct nf_conntrack_zone zone
;
1914 err
= ctnetlink_parse_zone(cda
[CTA_ZONE
], &zone
);
1918 if (cda
[CTA_TUPLE_ORIG
]) {
1919 err
= ctnetlink_parse_tuple(cda
, &otuple
, CTA_TUPLE_ORIG
,
1925 if (cda
[CTA_TUPLE_REPLY
]) {
1926 err
= ctnetlink_parse_tuple(cda
, &rtuple
, CTA_TUPLE_REPLY
,
1932 if (cda
[CTA_TUPLE_ORIG
])
1933 h
= nf_conntrack_find_get(net
, &zone
, &otuple
);
1934 else if (cda
[CTA_TUPLE_REPLY
])
1935 h
= nf_conntrack_find_get(net
, &zone
, &rtuple
);
1939 if (nlh
->nlmsg_flags
& NLM_F_CREATE
) {
1940 enum ip_conntrack_events events
;
1942 if (!cda
[CTA_TUPLE_ORIG
] || !cda
[CTA_TUPLE_REPLY
])
1944 if (otuple
.dst
.protonum
!= rtuple
.dst
.protonum
)
1947 ct
= ctnetlink_create_conntrack(net
, &zone
, cda
, &otuple
,
1953 if (test_bit(IPS_EXPECTED_BIT
, &ct
->status
))
1954 events
= 1 << IPCT_RELATED
;
1956 events
= 1 << IPCT_NEW
;
1958 if (cda
[CTA_LABELS
] &&
1959 ctnetlink_attach_labels(ct
, cda
) == 0)
1960 events
|= (1 << IPCT_LABEL
);
1962 nf_conntrack_eventmask_report((1 << IPCT_REPLY
) |
1963 (1 << IPCT_ASSURED
) |
1964 (1 << IPCT_HELPER
) |
1965 (1 << IPCT_PROTOINFO
) |
1966 (1 << IPCT_SEQADJ
) |
1967 (1 << IPCT_MARK
) | events
,
1968 ct
, NETLINK_CB(skb
).portid
,
1975 /* implicit 'else' */
1978 ct
= nf_ct_tuplehash_to_ctrack(h
);
1979 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
)) {
1980 err
= ctnetlink_change_conntrack(ct
, cda
);
1982 nf_conntrack_eventmask_report((1 << IPCT_REPLY
) |
1983 (1 << IPCT_ASSURED
) |
1984 (1 << IPCT_HELPER
) |
1986 (1 << IPCT_PROTOINFO
) |
1987 (1 << IPCT_SEQADJ
) |
1989 ct
, NETLINK_CB(skb
).portid
,
1999 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff
*skb
, u32 portid
, u32 seq
,
2000 __u16 cpu
, const struct ip_conntrack_stat
*st
)
2002 struct nlmsghdr
*nlh
;
2003 struct nfgenmsg
*nfmsg
;
2004 unsigned int flags
= portid
? NLM_F_MULTI
: 0, event
;
2006 event
= nfnl_msg_type(NFNL_SUBSYS_CTNETLINK
,
2007 IPCTNL_MSG_CT_GET_STATS_CPU
);
2008 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*nfmsg
), flags
);
2012 nfmsg
= nlmsg_data(nlh
);
2013 nfmsg
->nfgen_family
= AF_UNSPEC
;
2014 nfmsg
->version
= NFNETLINK_V0
;
2015 nfmsg
->res_id
= htons(cpu
);
2017 if (nla_put_be32(skb
, CTA_STATS_FOUND
, htonl(st
->found
)) ||
2018 nla_put_be32(skb
, CTA_STATS_INVALID
, htonl(st
->invalid
)) ||
2019 nla_put_be32(skb
, CTA_STATS_IGNORE
, htonl(st
->ignore
)) ||
2020 nla_put_be32(skb
, CTA_STATS_INSERT
, htonl(st
->insert
)) ||
2021 nla_put_be32(skb
, CTA_STATS_INSERT_FAILED
,
2022 htonl(st
->insert_failed
)) ||
2023 nla_put_be32(skb
, CTA_STATS_DROP
, htonl(st
->drop
)) ||
2024 nla_put_be32(skb
, CTA_STATS_EARLY_DROP
, htonl(st
->early_drop
)) ||
2025 nla_put_be32(skb
, CTA_STATS_ERROR
, htonl(st
->error
)) ||
2026 nla_put_be32(skb
, CTA_STATS_SEARCH_RESTART
,
2027 htonl(st
->search_restart
)))
2028 goto nla_put_failure
;
2030 nlmsg_end(skb
, nlh
);
2035 nlmsg_cancel(skb
, nlh
);
2040 ctnetlink_ct_stat_cpu_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2043 struct net
*net
= sock_net(skb
->sk
);
2045 if (cb
->args
[0] == nr_cpu_ids
)
2048 for (cpu
= cb
->args
[0]; cpu
< nr_cpu_ids
; cpu
++) {
2049 const struct ip_conntrack_stat
*st
;
2051 if (!cpu_possible(cpu
))
2054 st
= per_cpu_ptr(net
->ct
.stat
, cpu
);
2055 if (ctnetlink_ct_stat_cpu_fill_info(skb
,
2056 NETLINK_CB(cb
->skb
).portid
,
2066 static int ctnetlink_stat_ct_cpu(struct net
*net
, struct sock
*ctnl
,
2067 struct sk_buff
*skb
,
2068 const struct nlmsghdr
*nlh
,
2069 const struct nlattr
* const cda
[])
2071 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2072 struct netlink_dump_control c
= {
2073 .dump
= ctnetlink_ct_stat_cpu_dump
,
2075 return netlink_dump_start(ctnl
, skb
, nlh
, &c
);
2082 ctnetlink_stat_ct_fill_info(struct sk_buff
*skb
, u32 portid
, u32 seq
, u32 type
,
2085 struct nlmsghdr
*nlh
;
2086 struct nfgenmsg
*nfmsg
;
2087 unsigned int flags
= portid
? NLM_F_MULTI
: 0, event
;
2088 unsigned int nr_conntracks
= atomic_read(&net
->ct
.count
);
2090 event
= nfnl_msg_type(NFNL_SUBSYS_CTNETLINK
, IPCTNL_MSG_CT_GET_STATS
);
2091 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*nfmsg
), flags
);
2095 nfmsg
= nlmsg_data(nlh
);
2096 nfmsg
->nfgen_family
= AF_UNSPEC
;
2097 nfmsg
->version
= NFNETLINK_V0
;
2100 if (nla_put_be32(skb
, CTA_STATS_GLOBAL_ENTRIES
, htonl(nr_conntracks
)))
2101 goto nla_put_failure
;
2103 nlmsg_end(skb
, nlh
);
2108 nlmsg_cancel(skb
, nlh
);
2112 static int ctnetlink_stat_ct(struct net
*net
, struct sock
*ctnl
,
2113 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2114 const struct nlattr
* const cda
[])
2116 struct sk_buff
*skb2
;
2119 skb2
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
2123 err
= ctnetlink_stat_ct_fill_info(skb2
, NETLINK_CB(skb
).portid
,
2125 NFNL_MSG_TYPE(nlh
->nlmsg_type
),
2130 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).portid
, MSG_DONTWAIT
);
2139 /* this avoids a loop in nfnetlink. */
2140 return err
== -EAGAIN
? -ENOBUFS
: err
;
2143 static const struct nla_policy exp_nla_policy
[CTA_EXPECT_MAX
+1] = {
2144 [CTA_EXPECT_MASTER
] = { .type
= NLA_NESTED
},
2145 [CTA_EXPECT_TUPLE
] = { .type
= NLA_NESTED
},
2146 [CTA_EXPECT_MASK
] = { .type
= NLA_NESTED
},
2147 [CTA_EXPECT_TIMEOUT
] = { .type
= NLA_U32
},
2148 [CTA_EXPECT_ID
] = { .type
= NLA_U32
},
2149 [CTA_EXPECT_HELP_NAME
] = { .type
= NLA_NUL_STRING
,
2150 .len
= NF_CT_HELPER_NAME_LEN
- 1 },
2151 [CTA_EXPECT_ZONE
] = { .type
= NLA_U16
},
2152 [CTA_EXPECT_FLAGS
] = { .type
= NLA_U32
},
2153 [CTA_EXPECT_CLASS
] = { .type
= NLA_U32
},
2154 [CTA_EXPECT_NAT
] = { .type
= NLA_NESTED
},
2155 [CTA_EXPECT_FN
] = { .type
= NLA_NUL_STRING
},
2158 static struct nf_conntrack_expect
*
2159 ctnetlink_alloc_expect(const struct nlattr
*const cda
[], struct nf_conn
*ct
,
2160 struct nf_conntrack_helper
*helper
,
2161 struct nf_conntrack_tuple
*tuple
,
2162 struct nf_conntrack_tuple
*mask
);
2164 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2166 ctnetlink_glue_build_size(const struct nf_conn
*ct
)
2168 return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2169 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2170 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2171 + 3 * nla_total_size(sizeof(u_int8_t
)) /* CTA_PROTO_NUM */
2172 + nla_total_size(sizeof(u_int32_t
)) /* CTA_ID */
2173 + nla_total_size(sizeof(u_int32_t
)) /* CTA_STATUS */
2174 + nla_total_size(sizeof(u_int32_t
)) /* CTA_TIMEOUT */
2175 + nla_total_size(0) /* CTA_PROTOINFO */
2176 + nla_total_size(0) /* CTA_HELP */
2177 + nla_total_size(NF_CT_HELPER_NAME_LEN
) /* CTA_HELP_NAME */
2178 + ctnetlink_secctx_size(ct
)
2179 #ifdef CONFIG_NF_NAT_NEEDED
2180 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2181 + 6 * nla_total_size(sizeof(u_int32_t
)) /* CTA_NAT_SEQ_OFFSET */
2183 #ifdef CONFIG_NF_CONNTRACK_MARK
2184 + nla_total_size(sizeof(u_int32_t
)) /* CTA_MARK */
2186 #ifdef CONFIG_NF_CONNTRACK_ZONES
2187 + nla_total_size(sizeof(u_int16_t
)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2189 + ctnetlink_proto_size(ct
)
2193 static struct nf_conn
*ctnetlink_glue_get_ct(const struct sk_buff
*skb
,
2194 enum ip_conntrack_info
*ctinfo
)
2196 return nf_ct_get(skb
, ctinfo
);
2199 static int __ctnetlink_glue_build(struct sk_buff
*skb
, struct nf_conn
*ct
)
2201 const struct nf_conntrack_zone
*zone
;
2202 struct nlattr
*nest_parms
;
2205 zone
= nf_ct_zone(ct
);
2207 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_ORIG
| NLA_F_NESTED
);
2209 goto nla_put_failure
;
2210 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_ORIGINAL
)) < 0)
2211 goto nla_put_failure
;
2212 if (ctnetlink_dump_zone_id(skb
, CTA_TUPLE_ZONE
, zone
,
2213 NF_CT_ZONE_DIR_ORIG
) < 0)
2214 goto nla_put_failure
;
2215 nla_nest_end(skb
, nest_parms
);
2217 nest_parms
= nla_nest_start(skb
, CTA_TUPLE_REPLY
| NLA_F_NESTED
);
2219 goto nla_put_failure
;
2220 if (ctnetlink_dump_tuples(skb
, nf_ct_tuple(ct
, IP_CT_DIR_REPLY
)) < 0)
2221 goto nla_put_failure
;
2222 if (ctnetlink_dump_zone_id(skb
, CTA_TUPLE_ZONE
, zone
,
2223 NF_CT_ZONE_DIR_REPL
) < 0)
2224 goto nla_put_failure
;
2225 nla_nest_end(skb
, nest_parms
);
2227 if (ctnetlink_dump_zone_id(skb
, CTA_ZONE
, zone
,
2228 NF_CT_DEFAULT_ZONE_DIR
) < 0)
2229 goto nla_put_failure
;
2231 if (ctnetlink_dump_id(skb
, ct
) < 0)
2232 goto nla_put_failure
;
2234 if (ctnetlink_dump_status(skb
, ct
) < 0)
2235 goto nla_put_failure
;
2237 if (ctnetlink_dump_timeout(skb
, ct
) < 0)
2238 goto nla_put_failure
;
2240 if (ctnetlink_dump_protoinfo(skb
, ct
) < 0)
2241 goto nla_put_failure
;
2243 if (ctnetlink_dump_helpinfo(skb
, ct
) < 0)
2244 goto nla_put_failure
;
2246 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2247 if (ct
->secmark
&& ctnetlink_dump_secctx(skb
, ct
) < 0)
2248 goto nla_put_failure
;
2250 if (ct
->master
&& ctnetlink_dump_master(skb
, ct
) < 0)
2251 goto nla_put_failure
;
2253 if ((ct
->status
& IPS_SEQ_ADJUST
) &&
2254 ctnetlink_dump_ct_seq_adj(skb
, ct
) < 0)
2255 goto nla_put_failure
;
2257 #ifdef CONFIG_NF_CONNTRACK_MARK
2258 if (ct
->mark
&& ctnetlink_dump_mark(skb
, ct
) < 0)
2259 goto nla_put_failure
;
2261 if (ctnetlink_dump_labels(skb
, ct
) < 0)
2262 goto nla_put_failure
;
2272 ctnetlink_glue_build(struct sk_buff
*skb
, struct nf_conn
*ct
,
2273 enum ip_conntrack_info ctinfo
,
2274 u_int16_t ct_attr
, u_int16_t ct_info_attr
)
2276 struct nlattr
*nest_parms
;
2278 nest_parms
= nla_nest_start(skb
, ct_attr
| NLA_F_NESTED
);
2280 goto nla_put_failure
;
2282 if (__ctnetlink_glue_build(skb
, ct
) < 0)
2283 goto nla_put_failure
;
2285 nla_nest_end(skb
, nest_parms
);
2287 if (nla_put_be32(skb
, ct_info_attr
, htonl(ctinfo
)))
2288 goto nla_put_failure
;
2297 ctnetlink_update_status(struct nf_conn
*ct
, const struct nlattr
* const cda
[])
2299 unsigned int status
= ntohl(nla_get_be32(cda
[CTA_STATUS
]));
2300 unsigned long d
= ct
->status
^ status
;
2302 if (d
& IPS_SEEN_REPLY
&& !(status
& IPS_SEEN_REPLY
))
2303 /* SEEN_REPLY bit can only be set */
2306 if (d
& IPS_ASSURED
&& !(status
& IPS_ASSURED
))
2307 /* ASSURED bit can only be set */
2310 /* This check is less strict than ctnetlink_change_status()
2311 * because callers often flip IPS_EXPECTED bits when sending
2312 * an NFQA_CT attribute to the kernel. So ignore the
2313 * unchangeable bits but do not error out. Also user programs
2314 * are allowed to clear the bits that they are allowed to change.
2316 __ctnetlink_change_status(ct
, status
, ~status
);
2321 ctnetlink_glue_parse_ct(const struct nlattr
*cda
[], struct nf_conn
*ct
)
2325 if (cda
[CTA_TIMEOUT
]) {
2326 err
= ctnetlink_change_timeout(ct
, cda
);
2330 if (cda
[CTA_STATUS
]) {
2331 err
= ctnetlink_update_status(ct
, cda
);
2335 if (cda
[CTA_HELP
]) {
2336 err
= ctnetlink_change_helper(ct
, cda
);
2340 if (cda
[CTA_LABELS
]) {
2341 err
= ctnetlink_attach_labels(ct
, cda
);
2345 #if defined(CONFIG_NF_CONNTRACK_MARK)
2346 if (cda
[CTA_MARK
]) {
2347 u32 mask
= 0, mark
, newmark
;
2348 if (cda
[CTA_MARK_MASK
])
2349 mask
= ~ntohl(nla_get_be32(cda
[CTA_MARK_MASK
]));
2351 mark
= ntohl(nla_get_be32(cda
[CTA_MARK
]));
2352 newmark
= (ct
->mark
& mask
) ^ mark
;
2353 if (newmark
!= ct
->mark
)
2361 ctnetlink_glue_parse(const struct nlattr
*attr
, struct nf_conn
*ct
)
2363 struct nlattr
*cda
[CTA_MAX
+1];
2366 ret
= nla_parse_nested(cda
, CTA_MAX
, attr
, ct_nla_policy
, NULL
);
2370 return ctnetlink_glue_parse_ct((const struct nlattr
**)cda
, ct
);
2373 static int ctnetlink_glue_exp_parse(const struct nlattr
* const *cda
,
2374 const struct nf_conn
*ct
,
2375 struct nf_conntrack_tuple
*tuple
,
2376 struct nf_conntrack_tuple
*mask
)
2380 err
= ctnetlink_parse_tuple(cda
, tuple
, CTA_EXPECT_TUPLE
,
2381 nf_ct_l3num(ct
), NULL
);
2385 return ctnetlink_parse_tuple(cda
, mask
, CTA_EXPECT_MASK
,
2386 nf_ct_l3num(ct
), NULL
);
2390 ctnetlink_glue_attach_expect(const struct nlattr
*attr
, struct nf_conn
*ct
,
2391 u32 portid
, u32 report
)
2393 struct nlattr
*cda
[CTA_EXPECT_MAX
+1];
2394 struct nf_conntrack_tuple tuple
, mask
;
2395 struct nf_conntrack_helper
*helper
= NULL
;
2396 struct nf_conntrack_expect
*exp
;
2399 err
= nla_parse_nested(cda
, CTA_EXPECT_MAX
, attr
, exp_nla_policy
,
2404 err
= ctnetlink_glue_exp_parse((const struct nlattr
* const *)cda
,
2409 if (cda
[CTA_EXPECT_HELP_NAME
]) {
2410 const char *helpname
= nla_data(cda
[CTA_EXPECT_HELP_NAME
]);
2412 helper
= __nf_conntrack_helper_find(helpname
, nf_ct_l3num(ct
),
2413 nf_ct_protonum(ct
));
2418 exp
= ctnetlink_alloc_expect((const struct nlattr
* const *)cda
, ct
,
2419 helper
, &tuple
, &mask
);
2421 return PTR_ERR(exp
);
2423 err
= nf_ct_expect_related_report(exp
, portid
, report
);
2424 nf_ct_expect_put(exp
);
2428 static void ctnetlink_glue_seqadj(struct sk_buff
*skb
, struct nf_conn
*ct
,
2429 enum ip_conntrack_info ctinfo
, int diff
)
2431 if (!(ct
->status
& IPS_NAT_MASK
))
2434 nf_ct_tcp_seqadj_set(skb
, ct
, ctinfo
, diff
);
2437 static struct nfnl_ct_hook ctnetlink_glue_hook
= {
2438 .get_ct
= ctnetlink_glue_get_ct
,
2439 .build_size
= ctnetlink_glue_build_size
,
2440 .build
= ctnetlink_glue_build
,
2441 .parse
= ctnetlink_glue_parse
,
2442 .attach_expect
= ctnetlink_glue_attach_expect
,
2443 .seq_adjust
= ctnetlink_glue_seqadj
,
2445 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2447 /***********************************************************************
2449 ***********************************************************************/
2451 static int ctnetlink_exp_dump_tuple(struct sk_buff
*skb
,
2452 const struct nf_conntrack_tuple
*tuple
,
2455 struct nlattr
*nest_parms
;
2457 nest_parms
= nla_nest_start(skb
, type
| NLA_F_NESTED
);
2459 goto nla_put_failure
;
2460 if (ctnetlink_dump_tuples(skb
, tuple
) < 0)
2461 goto nla_put_failure
;
2462 nla_nest_end(skb
, nest_parms
);
2470 static int ctnetlink_exp_dump_mask(struct sk_buff
*skb
,
2471 const struct nf_conntrack_tuple
*tuple
,
2472 const struct nf_conntrack_tuple_mask
*mask
)
2475 struct nf_conntrack_l3proto
*l3proto
;
2476 struct nf_conntrack_l4proto
*l4proto
;
2477 struct nf_conntrack_tuple m
;
2478 struct nlattr
*nest_parms
;
2480 memset(&m
, 0xFF, sizeof(m
));
2481 memcpy(&m
.src
.u3
, &mask
->src
.u3
, sizeof(m
.src
.u3
));
2482 m
.src
.u
.all
= mask
->src
.u
.all
;
2483 m
.dst
.protonum
= tuple
->dst
.protonum
;
2485 nest_parms
= nla_nest_start(skb
, CTA_EXPECT_MASK
| NLA_F_NESTED
);
2487 goto nla_put_failure
;
2490 l3proto
= __nf_ct_l3proto_find(tuple
->src
.l3num
);
2491 ret
= ctnetlink_dump_tuples_ip(skb
, &m
, l3proto
);
2493 l4proto
= __nf_ct_l4proto_find(tuple
->src
.l3num
,
2494 tuple
->dst
.protonum
);
2495 ret
= ctnetlink_dump_tuples_proto(skb
, &m
, l4proto
);
2499 if (unlikely(ret
< 0))
2500 goto nla_put_failure
;
2502 nla_nest_end(skb
, nest_parms
);
2510 static const union nf_inet_addr any_addr
;
2513 ctnetlink_exp_dump_expect(struct sk_buff
*skb
,
2514 const struct nf_conntrack_expect
*exp
)
2516 struct nf_conn
*master
= exp
->master
;
2517 long timeout
= ((long)exp
->timeout
.expires
- (long)jiffies
) / HZ
;
2518 struct nf_conn_help
*help
;
2519 #ifdef CONFIG_NF_NAT_NEEDED
2520 struct nlattr
*nest_parms
;
2521 struct nf_conntrack_tuple nat_tuple
= {};
2523 struct nf_ct_helper_expectfn
*expfn
;
2528 if (ctnetlink_exp_dump_tuple(skb
, &exp
->tuple
, CTA_EXPECT_TUPLE
) < 0)
2529 goto nla_put_failure
;
2530 if (ctnetlink_exp_dump_mask(skb
, &exp
->tuple
, &exp
->mask
) < 0)
2531 goto nla_put_failure
;
2532 if (ctnetlink_exp_dump_tuple(skb
,
2533 &master
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
,
2534 CTA_EXPECT_MASTER
) < 0)
2535 goto nla_put_failure
;
2537 #ifdef CONFIG_NF_NAT_NEEDED
2538 if (!nf_inet_addr_cmp(&exp
->saved_addr
, &any_addr
) ||
2539 exp
->saved_proto
.all
) {
2540 nest_parms
= nla_nest_start(skb
, CTA_EXPECT_NAT
| NLA_F_NESTED
);
2542 goto nla_put_failure
;
2544 if (nla_put_be32(skb
, CTA_EXPECT_NAT_DIR
, htonl(exp
->dir
)))
2545 goto nla_put_failure
;
2547 nat_tuple
.src
.l3num
= nf_ct_l3num(master
);
2548 nat_tuple
.src
.u3
= exp
->saved_addr
;
2549 nat_tuple
.dst
.protonum
= nf_ct_protonum(master
);
2550 nat_tuple
.src
.u
= exp
->saved_proto
;
2552 if (ctnetlink_exp_dump_tuple(skb
, &nat_tuple
,
2553 CTA_EXPECT_NAT_TUPLE
) < 0)
2554 goto nla_put_failure
;
2555 nla_nest_end(skb
, nest_parms
);
2558 if (nla_put_be32(skb
, CTA_EXPECT_TIMEOUT
, htonl(timeout
)) ||
2559 nla_put_be32(skb
, CTA_EXPECT_ID
, htonl((unsigned long)exp
)) ||
2560 nla_put_be32(skb
, CTA_EXPECT_FLAGS
, htonl(exp
->flags
)) ||
2561 nla_put_be32(skb
, CTA_EXPECT_CLASS
, htonl(exp
->class)))
2562 goto nla_put_failure
;
2563 help
= nfct_help(master
);
2565 struct nf_conntrack_helper
*helper
;
2567 helper
= rcu_dereference(help
->helper
);
2569 nla_put_string(skb
, CTA_EXPECT_HELP_NAME
, helper
->name
))
2570 goto nla_put_failure
;
2572 expfn
= nf_ct_helper_expectfn_find_by_symbol(exp
->expectfn
);
2573 if (expfn
!= NULL
&&
2574 nla_put_string(skb
, CTA_EXPECT_FN
, expfn
->name
))
2575 goto nla_put_failure
;
2584 ctnetlink_exp_fill_info(struct sk_buff
*skb
, u32 portid
, u32 seq
,
2585 int event
, const struct nf_conntrack_expect
*exp
)
2587 struct nlmsghdr
*nlh
;
2588 struct nfgenmsg
*nfmsg
;
2589 unsigned int flags
= portid
? NLM_F_MULTI
: 0;
2591 event
= nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP
, event
);
2592 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*nfmsg
), flags
);
2596 nfmsg
= nlmsg_data(nlh
);
2597 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
2598 nfmsg
->version
= NFNETLINK_V0
;
2601 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
2602 goto nla_put_failure
;
2604 nlmsg_end(skb
, nlh
);
2609 nlmsg_cancel(skb
, nlh
);
2613 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2615 ctnetlink_expect_event(unsigned int events
, struct nf_exp_event
*item
)
2617 struct nf_conntrack_expect
*exp
= item
->exp
;
2618 struct net
*net
= nf_ct_exp_net(exp
);
2619 struct nlmsghdr
*nlh
;
2620 struct nfgenmsg
*nfmsg
;
2621 struct sk_buff
*skb
;
2622 unsigned int type
, group
;
2625 if (events
& (1 << IPEXP_DESTROY
)) {
2626 type
= IPCTNL_MSG_EXP_DELETE
;
2627 group
= NFNLGRP_CONNTRACK_EXP_DESTROY
;
2628 } else if (events
& (1 << IPEXP_NEW
)) {
2629 type
= IPCTNL_MSG_EXP_NEW
;
2630 flags
= NLM_F_CREATE
|NLM_F_EXCL
;
2631 group
= NFNLGRP_CONNTRACK_EXP_NEW
;
2635 if (!item
->report
&& !nfnetlink_has_listeners(net
, group
))
2638 skb
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_ATOMIC
);
2642 type
= nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP
, type
);
2643 nlh
= nlmsg_put(skb
, item
->portid
, 0, type
, sizeof(*nfmsg
), flags
);
2647 nfmsg
= nlmsg_data(nlh
);
2648 nfmsg
->nfgen_family
= exp
->tuple
.src
.l3num
;
2649 nfmsg
->version
= NFNETLINK_V0
;
2653 if (ctnetlink_exp_dump_expect(skb
, exp
) < 0)
2654 goto nla_put_failure
;
2657 nlmsg_end(skb
, nlh
);
2658 nfnetlink_send(skb
, net
, item
->portid
, group
, item
->report
, GFP_ATOMIC
);
2663 nlmsg_cancel(skb
, nlh
);
2667 nfnetlink_set_err(net
, 0, 0, -ENOBUFS
);
2671 static int ctnetlink_exp_done(struct netlink_callback
*cb
)
2674 nf_ct_expect_put((struct nf_conntrack_expect
*)cb
->args
[1]);
2679 ctnetlink_exp_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2681 struct net
*net
= sock_net(skb
->sk
);
2682 struct nf_conntrack_expect
*exp
, *last
;
2683 struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
2684 u_int8_t l3proto
= nfmsg
->nfgen_family
;
2687 last
= (struct nf_conntrack_expect
*)cb
->args
[1];
2688 for (; cb
->args
[0] < nf_ct_expect_hsize
; cb
->args
[0]++) {
2690 hlist_for_each_entry_rcu(exp
, &nf_ct_expect_hash
[cb
->args
[0]],
2692 if (l3proto
&& exp
->tuple
.src
.l3num
!= l3proto
)
2695 if (!net_eq(nf_ct_net(exp
->master
), net
))
2703 if (ctnetlink_exp_fill_info(skb
,
2704 NETLINK_CB(cb
->skb
).portid
,
2708 if (!refcount_inc_not_zero(&exp
->use
))
2710 cb
->args
[1] = (unsigned long)exp
;
2722 nf_ct_expect_put(last
);
2728 ctnetlink_exp_ct_dump_table(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2730 struct nf_conntrack_expect
*exp
, *last
;
2731 struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
2732 struct nf_conn
*ct
= cb
->data
;
2733 struct nf_conn_help
*help
= nfct_help(ct
);
2734 u_int8_t l3proto
= nfmsg
->nfgen_family
;
2740 last
= (struct nf_conntrack_expect
*)cb
->args
[1];
2742 hlist_for_each_entry_rcu(exp
, &help
->expectations
, lnode
) {
2743 if (l3proto
&& exp
->tuple
.src
.l3num
!= l3proto
)
2750 if (ctnetlink_exp_fill_info(skb
, NETLINK_CB(cb
->skb
).portid
,
2754 if (!refcount_inc_not_zero(&exp
->use
))
2756 cb
->args
[1] = (unsigned long)exp
;
2768 nf_ct_expect_put(last
);
2773 static int ctnetlink_dump_exp_ct(struct net
*net
, struct sock
*ctnl
,
2774 struct sk_buff
*skb
,
2775 const struct nlmsghdr
*nlh
,
2776 const struct nlattr
* const cda
[])
2779 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2780 u_int8_t u3
= nfmsg
->nfgen_family
;
2781 struct nf_conntrack_tuple tuple
;
2782 struct nf_conntrack_tuple_hash
*h
;
2784 struct nf_conntrack_zone zone
;
2785 struct netlink_dump_control c
= {
2786 .dump
= ctnetlink_exp_ct_dump_table
,
2787 .done
= ctnetlink_exp_done
,
2790 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_MASTER
,
2795 err
= ctnetlink_parse_zone(cda
[CTA_EXPECT_ZONE
], &zone
);
2799 h
= nf_conntrack_find_get(net
, &zone
, &tuple
);
2803 ct
= nf_ct_tuplehash_to_ctrack(h
);
2804 /* No expectation linked to this connection tracking. */
2805 if (!nfct_help(ct
)) {
2812 err
= netlink_dump_start(ctnl
, skb
, nlh
, &c
);
2818 static int ctnetlink_get_expect(struct net
*net
, struct sock
*ctnl
,
2819 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2820 const struct nlattr
* const cda
[])
2822 struct nf_conntrack_tuple tuple
;
2823 struct nf_conntrack_expect
*exp
;
2824 struct sk_buff
*skb2
;
2825 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2826 u_int8_t u3
= nfmsg
->nfgen_family
;
2827 struct nf_conntrack_zone zone
;
2830 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2831 if (cda
[CTA_EXPECT_MASTER
])
2832 return ctnetlink_dump_exp_ct(net
, ctnl
, skb
, nlh
, cda
);
2834 struct netlink_dump_control c
= {
2835 .dump
= ctnetlink_exp_dump_table
,
2836 .done
= ctnetlink_exp_done
,
2838 return netlink_dump_start(ctnl
, skb
, nlh
, &c
);
2842 err
= ctnetlink_parse_zone(cda
[CTA_EXPECT_ZONE
], &zone
);
2846 if (cda
[CTA_EXPECT_TUPLE
])
2847 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
,
2849 else if (cda
[CTA_EXPECT_MASTER
])
2850 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_MASTER
,
2858 exp
= nf_ct_expect_find_get(net
, &zone
, &tuple
);
2862 if (cda
[CTA_EXPECT_ID
]) {
2863 __be32 id
= nla_get_be32(cda
[CTA_EXPECT_ID
]);
2864 if (ntohl(id
) != (u32
)(unsigned long)exp
) {
2865 nf_ct_expect_put(exp
);
2871 skb2
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
2873 nf_ct_expect_put(exp
);
2878 err
= ctnetlink_exp_fill_info(skb2
, NETLINK_CB(skb
).portid
,
2879 nlh
->nlmsg_seq
, IPCTNL_MSG_EXP_NEW
, exp
);
2881 nf_ct_expect_put(exp
);
2885 err
= netlink_unicast(ctnl
, skb2
, NETLINK_CB(skb
).portid
, MSG_DONTWAIT
);
2894 /* this avoids a loop in nfnetlink. */
2895 return err
== -EAGAIN
? -ENOBUFS
: err
;
2898 static int ctnetlink_del_expect(struct net
*net
, struct sock
*ctnl
,
2899 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
2900 const struct nlattr
* const cda
[])
2902 struct nf_conntrack_expect
*exp
;
2903 struct nf_conntrack_tuple tuple
;
2904 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2905 struct hlist_node
*next
;
2906 u_int8_t u3
= nfmsg
->nfgen_family
;
2907 struct nf_conntrack_zone zone
;
2911 if (cda
[CTA_EXPECT_TUPLE
]) {
2912 /* delete a single expect by tuple */
2913 err
= ctnetlink_parse_zone(cda
[CTA_EXPECT_ZONE
], &zone
);
2917 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
,
2922 /* bump usage count to 2 */
2923 exp
= nf_ct_expect_find_get(net
, &zone
, &tuple
);
2927 if (cda
[CTA_EXPECT_ID
]) {
2928 __be32 id
= nla_get_be32(cda
[CTA_EXPECT_ID
]);
2929 if (ntohl(id
) != (u32
)(unsigned long)exp
) {
2930 nf_ct_expect_put(exp
);
2935 /* after list removal, usage count == 1 */
2936 spin_lock_bh(&nf_conntrack_expect_lock
);
2937 if (del_timer(&exp
->timeout
)) {
2938 nf_ct_unlink_expect_report(exp
, NETLINK_CB(skb
).portid
,
2940 nf_ct_expect_put(exp
);
2942 spin_unlock_bh(&nf_conntrack_expect_lock
);
2943 /* have to put what we 'get' above.
2944 * after this line usage count == 0 */
2945 nf_ct_expect_put(exp
);
2946 } else if (cda
[CTA_EXPECT_HELP_NAME
]) {
2947 char *name
= nla_data(cda
[CTA_EXPECT_HELP_NAME
]);
2948 struct nf_conn_help
*m_help
;
2950 /* delete all expectations for this helper */
2951 spin_lock_bh(&nf_conntrack_expect_lock
);
2952 for (i
= 0; i
< nf_ct_expect_hsize
; i
++) {
2953 hlist_for_each_entry_safe(exp
, next
,
2954 &nf_ct_expect_hash
[i
],
2957 if (!net_eq(nf_ct_exp_net(exp
), net
))
2960 m_help
= nfct_help(exp
->master
);
2961 if (!strcmp(m_help
->helper
->name
, name
) &&
2962 del_timer(&exp
->timeout
)) {
2963 nf_ct_unlink_expect_report(exp
,
2964 NETLINK_CB(skb
).portid
,
2966 nf_ct_expect_put(exp
);
2970 spin_unlock_bh(&nf_conntrack_expect_lock
);
2972 /* This basically means we have to flush everything*/
2973 spin_lock_bh(&nf_conntrack_expect_lock
);
2974 for (i
= 0; i
< nf_ct_expect_hsize
; i
++) {
2975 hlist_for_each_entry_safe(exp
, next
,
2976 &nf_ct_expect_hash
[i
],
2979 if (!net_eq(nf_ct_exp_net(exp
), net
))
2982 if (del_timer(&exp
->timeout
)) {
2983 nf_ct_unlink_expect_report(exp
,
2984 NETLINK_CB(skb
).portid
,
2986 nf_ct_expect_put(exp
);
2990 spin_unlock_bh(&nf_conntrack_expect_lock
);
2996 ctnetlink_change_expect(struct nf_conntrack_expect
*x
,
2997 const struct nlattr
* const cda
[])
2999 if (cda
[CTA_EXPECT_TIMEOUT
]) {
3000 if (!del_timer(&x
->timeout
))
3003 x
->timeout
.expires
= jiffies
+
3004 ntohl(nla_get_be32(cda
[CTA_EXPECT_TIMEOUT
])) * HZ
;
3005 add_timer(&x
->timeout
);
3010 static const struct nla_policy exp_nat_nla_policy
[CTA_EXPECT_NAT_MAX
+1] = {
3011 [CTA_EXPECT_NAT_DIR
] = { .type
= NLA_U32
},
3012 [CTA_EXPECT_NAT_TUPLE
] = { .type
= NLA_NESTED
},
3016 ctnetlink_parse_expect_nat(const struct nlattr
*attr
,
3017 struct nf_conntrack_expect
*exp
,
3020 #ifdef CONFIG_NF_NAT_NEEDED
3021 struct nlattr
*tb
[CTA_EXPECT_NAT_MAX
+1];
3022 struct nf_conntrack_tuple nat_tuple
= {};
3025 err
= nla_parse_nested(tb
, CTA_EXPECT_NAT_MAX
, attr
,
3026 exp_nat_nla_policy
, NULL
);
3030 if (!tb
[CTA_EXPECT_NAT_DIR
] || !tb
[CTA_EXPECT_NAT_TUPLE
])
3033 err
= ctnetlink_parse_tuple((const struct nlattr
* const *)tb
,
3034 &nat_tuple
, CTA_EXPECT_NAT_TUPLE
,
3039 exp
->saved_addr
= nat_tuple
.src
.u3
;
3040 exp
->saved_proto
= nat_tuple
.src
.u
;
3041 exp
->dir
= ntohl(nla_get_be32(tb
[CTA_EXPECT_NAT_DIR
]));
3049 static struct nf_conntrack_expect
*
3050 ctnetlink_alloc_expect(const struct nlattr
* const cda
[], struct nf_conn
*ct
,
3051 struct nf_conntrack_helper
*helper
,
3052 struct nf_conntrack_tuple
*tuple
,
3053 struct nf_conntrack_tuple
*mask
)
3055 u_int32_t
class = 0;
3056 struct nf_conntrack_expect
*exp
;
3057 struct nf_conn_help
*help
;
3060 help
= nfct_help(ct
);
3062 return ERR_PTR(-EOPNOTSUPP
);
3064 if (cda
[CTA_EXPECT_CLASS
] && helper
) {
3065 class = ntohl(nla_get_be32(cda
[CTA_EXPECT_CLASS
]));
3066 if (class > helper
->expect_class_max
)
3067 return ERR_PTR(-EINVAL
);
3069 exp
= nf_ct_expect_alloc(ct
);
3071 return ERR_PTR(-ENOMEM
);
3073 if (cda
[CTA_EXPECT_FLAGS
]) {
3074 exp
->flags
= ntohl(nla_get_be32(cda
[CTA_EXPECT_FLAGS
]));
3075 exp
->flags
&= ~NF_CT_EXPECT_USERSPACE
;
3079 if (cda
[CTA_EXPECT_FN
]) {
3080 const char *name
= nla_data(cda
[CTA_EXPECT_FN
]);
3081 struct nf_ct_helper_expectfn
*expfn
;
3083 expfn
= nf_ct_helper_expectfn_find_by_name(name
);
3084 if (expfn
== NULL
) {
3088 exp
->expectfn
= expfn
->expectfn
;
3090 exp
->expectfn
= NULL
;
3094 exp
->helper
= helper
;
3095 exp
->tuple
= *tuple
;
3096 exp
->mask
.src
.u3
= mask
->src
.u3
;
3097 exp
->mask
.src
.u
.all
= mask
->src
.u
.all
;
3099 if (cda
[CTA_EXPECT_NAT
]) {
3100 err
= ctnetlink_parse_expect_nat(cda
[CTA_EXPECT_NAT
],
3101 exp
, nf_ct_l3num(ct
));
3107 nf_ct_expect_put(exp
);
3108 return ERR_PTR(err
);
3112 ctnetlink_create_expect(struct net
*net
,
3113 const struct nf_conntrack_zone
*zone
,
3114 const struct nlattr
* const cda
[],
3115 u_int8_t u3
, u32 portid
, int report
)
3117 struct nf_conntrack_tuple tuple
, mask
, master_tuple
;
3118 struct nf_conntrack_tuple_hash
*h
= NULL
;
3119 struct nf_conntrack_helper
*helper
= NULL
;
3120 struct nf_conntrack_expect
*exp
;
3124 /* caller guarantees that those three CTA_EXPECT_* exist */
3125 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
,
3129 err
= ctnetlink_parse_tuple(cda
, &mask
, CTA_EXPECT_MASK
,
3133 err
= ctnetlink_parse_tuple(cda
, &master_tuple
, CTA_EXPECT_MASTER
,
3138 /* Look for master conntrack of this expectation */
3139 h
= nf_conntrack_find_get(net
, zone
, &master_tuple
);
3142 ct
= nf_ct_tuplehash_to_ctrack(h
);
3145 if (cda
[CTA_EXPECT_HELP_NAME
]) {
3146 const char *helpname
= nla_data(cda
[CTA_EXPECT_HELP_NAME
]);
3148 helper
= __nf_conntrack_helper_find(helpname
, u3
,
3149 nf_ct_protonum(ct
));
3150 if (helper
== NULL
) {
3152 #ifdef CONFIG_MODULES
3153 if (request_module("nfct-helper-%s", helpname
) < 0) {
3158 helper
= __nf_conntrack_helper_find(helpname
, u3
,
3159 nf_ct_protonum(ct
));
3171 exp
= ctnetlink_alloc_expect(cda
, ct
, helper
, &tuple
, &mask
);
3177 err
= nf_ct_expect_related_report(exp
, portid
, report
);
3178 nf_ct_expect_put(exp
);
3186 static int ctnetlink_new_expect(struct net
*net
, struct sock
*ctnl
,
3187 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
3188 const struct nlattr
* const cda
[])
3190 struct nf_conntrack_tuple tuple
;
3191 struct nf_conntrack_expect
*exp
;
3192 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
3193 u_int8_t u3
= nfmsg
->nfgen_family
;
3194 struct nf_conntrack_zone zone
;
3197 if (!cda
[CTA_EXPECT_TUPLE
]
3198 || !cda
[CTA_EXPECT_MASK
]
3199 || !cda
[CTA_EXPECT_MASTER
])
3202 err
= ctnetlink_parse_zone(cda
[CTA_EXPECT_ZONE
], &zone
);
3206 err
= ctnetlink_parse_tuple(cda
, &tuple
, CTA_EXPECT_TUPLE
,
3211 spin_lock_bh(&nf_conntrack_expect_lock
);
3212 exp
= __nf_ct_expect_find(net
, &zone
, &tuple
);
3214 spin_unlock_bh(&nf_conntrack_expect_lock
);
3216 if (nlh
->nlmsg_flags
& NLM_F_CREATE
) {
3217 err
= ctnetlink_create_expect(net
, &zone
, cda
, u3
,
3218 NETLINK_CB(skb
).portid
,
3225 if (!(nlh
->nlmsg_flags
& NLM_F_EXCL
))
3226 err
= ctnetlink_change_expect(exp
, cda
);
3227 spin_unlock_bh(&nf_conntrack_expect_lock
);
3233 ctnetlink_exp_stat_fill_info(struct sk_buff
*skb
, u32 portid
, u32 seq
, int cpu
,
3234 const struct ip_conntrack_stat
*st
)
3236 struct nlmsghdr
*nlh
;
3237 struct nfgenmsg
*nfmsg
;
3238 unsigned int flags
= portid
? NLM_F_MULTI
: 0, event
;
3240 event
= nfnl_msg_type(NFNL_SUBSYS_CTNETLINK
,
3241 IPCTNL_MSG_EXP_GET_STATS_CPU
);
3242 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*nfmsg
), flags
);
3246 nfmsg
= nlmsg_data(nlh
);
3247 nfmsg
->nfgen_family
= AF_UNSPEC
;
3248 nfmsg
->version
= NFNETLINK_V0
;
3249 nfmsg
->res_id
= htons(cpu
);
3251 if (nla_put_be32(skb
, CTA_STATS_EXP_NEW
, htonl(st
->expect_new
)) ||
3252 nla_put_be32(skb
, CTA_STATS_EXP_CREATE
, htonl(st
->expect_create
)) ||
3253 nla_put_be32(skb
, CTA_STATS_EXP_DELETE
, htonl(st
->expect_delete
)))
3254 goto nla_put_failure
;
3256 nlmsg_end(skb
, nlh
);
3261 nlmsg_cancel(skb
, nlh
);
3266 ctnetlink_exp_stat_cpu_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
)
3269 struct net
*net
= sock_net(skb
->sk
);
3271 if (cb
->args
[0] == nr_cpu_ids
)
3274 for (cpu
= cb
->args
[0]; cpu
< nr_cpu_ids
; cpu
++) {
3275 const struct ip_conntrack_stat
*st
;
3277 if (!cpu_possible(cpu
))
3280 st
= per_cpu_ptr(net
->ct
.stat
, cpu
);
3281 if (ctnetlink_exp_stat_fill_info(skb
, NETLINK_CB(cb
->skb
).portid
,
3291 static int ctnetlink_stat_exp_cpu(struct net
*net
, struct sock
*ctnl
,
3292 struct sk_buff
*skb
,
3293 const struct nlmsghdr
*nlh
,
3294 const struct nlattr
* const cda
[])
3296 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
3297 struct netlink_dump_control c
= {
3298 .dump
= ctnetlink_exp_stat_cpu_dump
,
3300 return netlink_dump_start(ctnl
, skb
, nlh
, &c
);
3306 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3307 static struct nf_ct_event_notifier ctnl_notifier
= {
3308 .fcn
= ctnetlink_conntrack_event
,
3311 static struct nf_exp_event_notifier ctnl_notifier_exp
= {
3312 .fcn
= ctnetlink_expect_event
,
3316 static const struct nfnl_callback ctnl_cb
[IPCTNL_MSG_MAX
] = {
3317 [IPCTNL_MSG_CT_NEW
] = { .call
= ctnetlink_new_conntrack
,
3318 .attr_count
= CTA_MAX
,
3319 .policy
= ct_nla_policy
},
3320 [IPCTNL_MSG_CT_GET
] = { .call
= ctnetlink_get_conntrack
,
3321 .attr_count
= CTA_MAX
,
3322 .policy
= ct_nla_policy
},
3323 [IPCTNL_MSG_CT_DELETE
] = { .call
= ctnetlink_del_conntrack
,
3324 .attr_count
= CTA_MAX
,
3325 .policy
= ct_nla_policy
},
3326 [IPCTNL_MSG_CT_GET_CTRZERO
] = { .call
= ctnetlink_get_conntrack
,
3327 .attr_count
= CTA_MAX
,
3328 .policy
= ct_nla_policy
},
3329 [IPCTNL_MSG_CT_GET_STATS_CPU
] = { .call
= ctnetlink_stat_ct_cpu
},
3330 [IPCTNL_MSG_CT_GET_STATS
] = { .call
= ctnetlink_stat_ct
},
3331 [IPCTNL_MSG_CT_GET_DYING
] = { .call
= ctnetlink_get_ct_dying
},
3332 [IPCTNL_MSG_CT_GET_UNCONFIRMED
] = { .call
= ctnetlink_get_ct_unconfirmed
},
3335 static const struct nfnl_callback ctnl_exp_cb
[IPCTNL_MSG_EXP_MAX
] = {
3336 [IPCTNL_MSG_EXP_GET
] = { .call
= ctnetlink_get_expect
,
3337 .attr_count
= CTA_EXPECT_MAX
,
3338 .policy
= exp_nla_policy
},
3339 [IPCTNL_MSG_EXP_NEW
] = { .call
= ctnetlink_new_expect
,
3340 .attr_count
= CTA_EXPECT_MAX
,
3341 .policy
= exp_nla_policy
},
3342 [IPCTNL_MSG_EXP_DELETE
] = { .call
= ctnetlink_del_expect
,
3343 .attr_count
= CTA_EXPECT_MAX
,
3344 .policy
= exp_nla_policy
},
3345 [IPCTNL_MSG_EXP_GET_STATS_CPU
] = { .call
= ctnetlink_stat_exp_cpu
},
3348 static const struct nfnetlink_subsystem ctnl_subsys
= {
3349 .name
= "conntrack",
3350 .subsys_id
= NFNL_SUBSYS_CTNETLINK
,
3351 .cb_count
= IPCTNL_MSG_MAX
,
3355 static const struct nfnetlink_subsystem ctnl_exp_subsys
= {
3356 .name
= "conntrack_expect",
3357 .subsys_id
= NFNL_SUBSYS_CTNETLINK_EXP
,
3358 .cb_count
= IPCTNL_MSG_EXP_MAX
,
3362 MODULE_ALIAS("ip_conntrack_netlink");
3363 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK
);
3364 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP
);
3366 static int __net_init
ctnetlink_net_init(struct net
*net
)
3368 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3371 ret
= nf_conntrack_register_notifier(net
, &ctnl_notifier
);
3373 pr_err("ctnetlink_init: cannot register notifier.\n");
3377 ret
= nf_ct_expect_register_notifier(net
, &ctnl_notifier_exp
);
3379 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3380 goto err_unreg_notifier
;
3385 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3387 nf_conntrack_unregister_notifier(net
, &ctnl_notifier
);
3393 static void ctnetlink_net_exit(struct net
*net
)
3395 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3396 nf_ct_expect_unregister_notifier(net
, &ctnl_notifier_exp
);
3397 nf_conntrack_unregister_notifier(net
, &ctnl_notifier
);
3401 static void __net_exit
ctnetlink_net_exit_batch(struct list_head
*net_exit_list
)
3405 list_for_each_entry(net
, net_exit_list
, exit_list
)
3406 ctnetlink_net_exit(net
);
3409 static struct pernet_operations ctnetlink_net_ops
= {
3410 .init
= ctnetlink_net_init
,
3411 .exit_batch
= ctnetlink_net_exit_batch
,
3414 static int __init
ctnetlink_init(void)
3418 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version
);
3419 ret
= nfnetlink_subsys_register(&ctnl_subsys
);
3421 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3425 ret
= nfnetlink_subsys_register(&ctnl_exp_subsys
);
3427 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3428 goto err_unreg_subsys
;
3431 ret
= register_pernet_subsys(&ctnetlink_net_ops
);
3433 pr_err("ctnetlink_init: cannot register pernet operations\n");
3434 goto err_unreg_exp_subsys
;
3436 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3437 /* setup interaction between nf_queue and nf_conntrack_netlink. */
3438 RCU_INIT_POINTER(nfnl_ct_hook
, &ctnetlink_glue_hook
);
3442 err_unreg_exp_subsys
:
3443 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
3445 nfnetlink_subsys_unregister(&ctnl_subsys
);
3450 static void __exit
ctnetlink_exit(void)
3452 pr_info("ctnetlink: unregistering from nfnetlink.\n");
3454 unregister_pernet_subsys(&ctnetlink_net_ops
);
3455 nfnetlink_subsys_unregister(&ctnl_exp_subsys
);
3456 nfnetlink_subsys_unregister(&ctnl_subsys
);
3457 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3458 RCU_INIT_POINTER(nfnl_ct_hook
, NULL
);
3463 module_init(ctnetlink_init
);
3464 module_exit(ctnetlink_exit
);