1 /* SCTP kernel implementation
2 * (C) Copyright Red Hat Inc. 2017
4 * This file is part of the SCTP kernel implementation
6 * These functions implement sctp diag support.
8 * This SCTP implementation is free software;
9 * you can redistribute it and/or modify it under the terms of
10 * the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
14 * This SCTP implementation is distributed in the hope that it
15 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
16 * ************************
17 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
18 * See the GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with GNU CC; see the file COPYING. If not, see
22 * <http://www.gnu.org/licenses/>.
24 * Please send any bug reports or fixes you make to the
25 * email addresched(es):
26 * lksctp developers <linux-sctp@vger.kernel.org>
28 * Written or modified by:
29 * Xin Long <lucien.xin@gmail.com>
32 #include <linux/module.h>
33 #include <linux/inet_diag.h>
34 #include <linux/sock_diag.h>
35 #include <net/sctp/sctp.h>
37 static void sctp_diag_get_info(struct sock
*sk
, struct inet_diag_msg
*r
,
40 /* define some functions to make asoc/ep fill look clean */
41 static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg
*r
,
43 struct sctp_association
*asoc
)
45 union sctp_addr laddr
, paddr
;
46 struct dst_entry
*dst
;
47 struct timer_list
*t3_rtx
= &asoc
->peer
.primary_path
->T3_rtx_timer
;
49 laddr
= list_entry(asoc
->base
.bind_addr
.address_list
.next
,
50 struct sctp_sockaddr_entry
, list
)->a
;
51 paddr
= asoc
->peer
.primary_path
->ipaddr
;
52 dst
= asoc
->peer
.primary_path
->dst
;
54 r
->idiag_family
= sk
->sk_family
;
55 r
->id
.idiag_sport
= htons(asoc
->base
.bind_addr
.port
);
56 r
->id
.idiag_dport
= htons(asoc
->peer
.port
);
57 r
->id
.idiag_if
= dst
? dst
->dev
->ifindex
: 0;
58 sock_diag_save_cookie(sk
, r
->id
.idiag_cookie
);
60 #if IS_ENABLED(CONFIG_IPV6)
61 if (sk
->sk_family
== AF_INET6
) {
62 *(struct in6_addr
*)r
->id
.idiag_src
= laddr
.v6
.sin6_addr
;
63 *(struct in6_addr
*)r
->id
.idiag_dst
= paddr
.v6
.sin6_addr
;
67 memset(&r
->id
.idiag_src
, 0, sizeof(r
->id
.idiag_src
));
68 memset(&r
->id
.idiag_dst
, 0, sizeof(r
->id
.idiag_dst
));
70 r
->id
.idiag_src
[0] = laddr
.v4
.sin_addr
.s_addr
;
71 r
->id
.idiag_dst
[0] = paddr
.v4
.sin_addr
.s_addr
;
74 r
->idiag_state
= asoc
->state
;
75 if (timer_pending(t3_rtx
)) {
76 r
->idiag_timer
= SCTP_EVENT_TIMEOUT_T3_RTX
;
77 r
->idiag_retrans
= asoc
->rtx_data_chunks
;
78 r
->idiag_expires
= jiffies_to_msecs(t3_rtx
->expires
- jiffies
);
86 static int inet_diag_msg_sctpladdrs_fill(struct sk_buff
*skb
,
87 struct list_head
*address_list
)
89 struct sctp_sockaddr_entry
*laddr
;
90 int addrlen
= sizeof(struct sockaddr_storage
);
95 list_for_each_entry_rcu(laddr
, address_list
, list
)
98 attr
= nla_reserve(skb
, INET_DIAG_LOCALS
, addrlen
* addrcnt
);
102 info
= nla_data(attr
);
103 list_for_each_entry_rcu(laddr
, address_list
, list
) {
104 memcpy(info
, &laddr
->a
, sizeof(laddr
->a
));
105 memset(info
+ sizeof(laddr
->a
), 0, addrlen
- sizeof(laddr
->a
));
112 static int inet_diag_msg_sctpaddrs_fill(struct sk_buff
*skb
,
113 struct sctp_association
*asoc
)
115 int addrlen
= sizeof(struct sockaddr_storage
);
116 struct sctp_transport
*from
;
120 attr
= nla_reserve(skb
, INET_DIAG_PEERS
,
121 addrlen
* asoc
->peer
.transport_count
);
125 info
= nla_data(attr
);
126 list_for_each_entry(from
, &asoc
->peer
.transport_addr_list
,
128 memcpy(info
, &from
->ipaddr
, sizeof(from
->ipaddr
));
129 memset(info
+ sizeof(from
->ipaddr
), 0,
130 addrlen
- sizeof(from
->ipaddr
));
137 /* sctp asoc/ep fill*/
138 static int inet_sctp_diag_fill(struct sock
*sk
, struct sctp_association
*asoc
,
140 const struct inet_diag_req_v2
*req
,
141 struct user_namespace
*user_ns
,
142 int portid
, u32 seq
, u16 nlmsg_flags
,
143 const struct nlmsghdr
*unlh
,
146 struct sctp_endpoint
*ep
= sctp_sk(sk
)->ep
;
147 struct list_head
*addr_list
;
148 struct inet_diag_msg
*r
;
149 struct nlmsghdr
*nlh
;
150 int ext
= req
->idiag_ext
;
151 struct sctp_infox infox
;
154 nlh
= nlmsg_put(skb
, portid
, seq
, unlh
->nlmsg_type
, sizeof(*r
),
160 BUG_ON(!sk_fullsock(sk
));
163 inet_diag_msg_sctpasoc_fill(r
, sk
, asoc
);
165 inet_diag_msg_common_fill(r
, sk
);
166 r
->idiag_state
= sk
->sk_state
;
168 r
->idiag_retrans
= 0;
171 if (inet_diag_msg_attrs_fill(sk
, skb
, r
, ext
, user_ns
, net_admin
))
174 if (ext
& (1 << (INET_DIAG_SKMEMINFO
- 1))) {
175 u32 mem
[SK_MEMINFO_VARS
];
178 if (asoc
&& asoc
->ep
->sndbuf_policy
)
179 amt
= asoc
->sndbuf_used
;
181 amt
= sk_wmem_alloc_get(sk
);
182 mem
[SK_MEMINFO_WMEM_ALLOC
] = amt
;
183 if (asoc
&& asoc
->ep
->rcvbuf_policy
)
184 amt
= atomic_read(&asoc
->rmem_alloc
);
186 amt
= sk_rmem_alloc_get(sk
);
187 mem
[SK_MEMINFO_RMEM_ALLOC
] = amt
;
188 mem
[SK_MEMINFO_RCVBUF
] = sk
->sk_rcvbuf
;
189 mem
[SK_MEMINFO_SNDBUF
] = sk
->sk_sndbuf
;
190 mem
[SK_MEMINFO_FWD_ALLOC
] = sk
->sk_forward_alloc
;
191 mem
[SK_MEMINFO_WMEM_QUEUED
] = sk
->sk_wmem_queued
;
192 mem
[SK_MEMINFO_OPTMEM
] = atomic_read(&sk
->sk_omem_alloc
);
193 mem
[SK_MEMINFO_BACKLOG
] = sk
->sk_backlog
.len
;
194 mem
[SK_MEMINFO_DROPS
] = atomic_read(&sk
->sk_drops
);
196 if (nla_put(skb
, INET_DIAG_SKMEMINFO
, sizeof(mem
), &mem
) < 0)
200 if (ext
& (1 << (INET_DIAG_INFO
- 1))) {
203 attr
= nla_reserve_64bit(skb
, INET_DIAG_INFO
,
204 sizeof(struct sctp_info
),
209 info
= nla_data(attr
);
211 infox
.sctpinfo
= (struct sctp_info
*)info
;
213 sctp_diag_get_info(sk
, r
, &infox
);
215 addr_list
= asoc
? &asoc
->base
.bind_addr
.address_list
216 : &ep
->base
.bind_addr
.address_list
;
217 if (inet_diag_msg_sctpladdrs_fill(skb
, addr_list
))
220 if (asoc
&& (ext
& (1 << (INET_DIAG_CONG
- 1))))
221 if (nla_put_string(skb
, INET_DIAG_CONG
, "reno") < 0)
224 if (asoc
&& inet_diag_msg_sctpaddrs_fill(skb
, asoc
))
231 nlmsg_cancel(skb
, nlh
);
235 /* callback and param */
236 struct sctp_comm_param
{
238 struct netlink_callback
*cb
;
239 const struct inet_diag_req_v2
*r
;
240 const struct nlmsghdr
*nlh
;
244 static size_t inet_assoc_attr_size(struct sctp_association
*asoc
)
246 int addrlen
= sizeof(struct sockaddr_storage
);
248 struct sctp_sockaddr_entry
*laddr
;
250 list_for_each_entry_rcu(laddr
, &asoc
->base
.bind_addr
.address_list
,
254 return nla_total_size(sizeof(struct sctp_info
))
255 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
256 + nla_total_size(1) /* INET_DIAG_TOS */
257 + nla_total_size(1) /* INET_DIAG_TCLASS */
258 + nla_total_size(4) /* INET_DIAG_MARK */
259 + nla_total_size(addrlen
* asoc
->peer
.transport_count
)
260 + nla_total_size(addrlen
* addrcnt
)
261 + nla_total_size(sizeof(struct inet_diag_meminfo
))
262 + nla_total_size(sizeof(struct inet_diag_msg
))
266 static int sctp_tsp_dump_one(struct sctp_transport
*tsp
, void *p
)
268 struct sctp_association
*assoc
= tsp
->asoc
;
269 struct sock
*sk
= tsp
->asoc
->base
.sk
;
270 struct sctp_comm_param
*commp
= p
;
271 struct sk_buff
*in_skb
= commp
->skb
;
272 const struct inet_diag_req_v2
*req
= commp
->r
;
273 const struct nlmsghdr
*nlh
= commp
->nlh
;
274 struct net
*net
= sock_net(in_skb
->sk
);
278 err
= sock_diag_check_cookie(sk
, req
->id
.idiag_cookie
);
283 rep
= nlmsg_new(inet_assoc_attr_size(assoc
), GFP_KERNEL
);
288 if (sk
!= assoc
->base
.sk
) {
293 err
= inet_sctp_diag_fill(sk
, assoc
, rep
, req
,
294 sk_user_ns(NETLINK_CB(in_skb
).sk
),
295 NETLINK_CB(in_skb
).portid
,
296 nlh
->nlmsg_seq
, 0, nlh
,
300 WARN_ON(err
== -EMSGSIZE
);
305 err
= netlink_unicast(net
->diag_nlsk
, rep
, NETLINK_CB(in_skb
).portid
,
313 static int sctp_sock_dump(struct sctp_transport
*tsp
, void *p
)
315 struct sctp_endpoint
*ep
= tsp
->asoc
->ep
;
316 struct sctp_comm_param
*commp
= p
;
317 struct sock
*sk
= ep
->base
.sk
;
318 struct sk_buff
*skb
= commp
->skb
;
319 struct netlink_callback
*cb
= commp
->cb
;
320 const struct inet_diag_req_v2
*r
= commp
->r
;
321 struct sctp_association
*assoc
;
325 list_for_each_entry(assoc
, &ep
->asocs
, asocs
) {
326 if (cb
->args
[4] < cb
->args
[1])
329 if (r
->id
.idiag_sport
!= htons(assoc
->base
.bind_addr
.port
) &&
332 if (r
->id
.idiag_dport
!= htons(assoc
->peer
.port
) &&
337 inet_sctp_diag_fill(sk
, NULL
, skb
, r
,
338 sk_user_ns(NETLINK_CB(cb
->skb
).sk
),
339 NETLINK_CB(cb
->skb
).portid
,
341 NLM_F_MULTI
, cb
->nlh
,
342 commp
->net_admin
) < 0) {
348 if (inet_sctp_diag_fill(sk
, assoc
, skb
, r
,
349 sk_user_ns(NETLINK_CB(cb
->skb
).sk
),
350 NETLINK_CB(cb
->skb
).portid
,
351 cb
->nlh
->nlmsg_seq
, 0, cb
->nlh
,
352 commp
->net_admin
) < 0) {
367 static int sctp_sock_filter(struct sctp_transport
*tsp
, void *p
)
369 struct sctp_endpoint
*ep
= tsp
->asoc
->ep
;
370 struct sctp_comm_param
*commp
= p
;
371 struct sock
*sk
= ep
->base
.sk
;
372 const struct inet_diag_req_v2
*r
= commp
->r
;
373 struct sctp_association
*assoc
=
374 list_entry(ep
->asocs
.next
, struct sctp_association
, asocs
);
376 /* find the ep only once through the transports by this condition */
377 if (tsp
->asoc
!= assoc
)
380 if (r
->sdiag_family
!= AF_UNSPEC
&& sk
->sk_family
!= r
->sdiag_family
)
386 static int sctp_ep_dump(struct sctp_endpoint
*ep
, void *p
)
388 struct sctp_comm_param
*commp
= p
;
389 struct sock
*sk
= ep
->base
.sk
;
390 struct sk_buff
*skb
= commp
->skb
;
391 struct netlink_callback
*cb
= commp
->cb
;
392 const struct inet_diag_req_v2
*r
= commp
->r
;
393 struct net
*net
= sock_net(skb
->sk
);
394 struct inet_sock
*inet
= inet_sk(sk
);
397 if (!net_eq(sock_net(sk
), net
))
400 if (cb
->args
[4] < cb
->args
[1])
403 if (!(r
->idiag_states
& TCPF_LISTEN
) && !list_empty(&ep
->asocs
))
406 if (r
->sdiag_family
!= AF_UNSPEC
&&
407 sk
->sk_family
!= r
->sdiag_family
)
410 if (r
->id
.idiag_sport
!= inet
->inet_sport
&&
414 if (r
->id
.idiag_dport
!= inet
->inet_dport
&&
418 if (inet_sctp_diag_fill(sk
, NULL
, skb
, r
,
419 sk_user_ns(NETLINK_CB(cb
->skb
).sk
),
420 NETLINK_CB(cb
->skb
).portid
,
421 cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
,
422 cb
->nlh
, commp
->net_admin
) < 0) {
432 /* define the functions for sctp_diag_handler*/
433 static void sctp_diag_get_info(struct sock
*sk
, struct inet_diag_msg
*r
,
436 struct sctp_infox
*infox
= (struct sctp_infox
*)info
;
439 r
->idiag_rqueue
= atomic_read(&infox
->asoc
->rmem_alloc
);
440 r
->idiag_wqueue
= infox
->asoc
->sndbuf_used
;
442 r
->idiag_rqueue
= sk
->sk_ack_backlog
;
443 r
->idiag_wqueue
= sk
->sk_max_ack_backlog
;
446 sctp_get_sctp_info(sk
, infox
->asoc
, infox
->sctpinfo
);
449 static int sctp_diag_dump_one(struct sk_buff
*in_skb
,
450 const struct nlmsghdr
*nlh
,
451 const struct inet_diag_req_v2
*req
)
453 struct net
*net
= sock_net(in_skb
->sk
);
454 union sctp_addr laddr
, paddr
;
455 struct sctp_comm_param commp
= {
459 .net_admin
= netlink_net_capable(in_skb
, CAP_NET_ADMIN
),
462 if (req
->sdiag_family
== AF_INET
) {
463 laddr
.v4
.sin_port
= req
->id
.idiag_sport
;
464 laddr
.v4
.sin_addr
.s_addr
= req
->id
.idiag_src
[0];
465 laddr
.v4
.sin_family
= AF_INET
;
467 paddr
.v4
.sin_port
= req
->id
.idiag_dport
;
468 paddr
.v4
.sin_addr
.s_addr
= req
->id
.idiag_dst
[0];
469 paddr
.v4
.sin_family
= AF_INET
;
471 laddr
.v6
.sin6_port
= req
->id
.idiag_sport
;
472 memcpy(&laddr
.v6
.sin6_addr
, req
->id
.idiag_src
,
473 sizeof(laddr
.v6
.sin6_addr
));
474 laddr
.v6
.sin6_family
= AF_INET6
;
476 paddr
.v6
.sin6_port
= req
->id
.idiag_dport
;
477 memcpy(&paddr
.v6
.sin6_addr
, req
->id
.idiag_dst
,
478 sizeof(paddr
.v6
.sin6_addr
));
479 paddr
.v6
.sin6_family
= AF_INET6
;
482 return sctp_transport_lookup_process(sctp_tsp_dump_one
,
483 net
, &laddr
, &paddr
, &commp
);
486 static void sctp_diag_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
,
487 const struct inet_diag_req_v2
*r
, struct nlattr
*bc
)
489 u32 idiag_states
= r
->idiag_states
;
490 struct net
*net
= sock_net(skb
->sk
);
491 struct sctp_comm_param commp
= {
495 .net_admin
= netlink_net_capable(cb
->skb
, CAP_NET_ADMIN
),
497 int pos
= cb
->args
[2];
499 /* eps hashtable dumps
501 * 0 : if it will traversal listen sock
502 * 1 : to record the sock pos of this time's traversal
503 * 4 : to work as a temporary variable to traversal list
505 if (cb
->args
[0] == 0) {
506 if (!(idiag_states
& TCPF_LISTEN
))
508 if (sctp_for_each_endpoint(sctp_ep_dump
, &commp
))
516 /* asocs by transport hashtable dump
518 * 1 : to record the assoc pos of this time's traversal
519 * 2 : to record the transport pos of this time's traversal
520 * 3 : to mark if we have dumped the ep info of the current asoc
521 * 4 : to work as a temporary variable to traversal list
522 * 5 : to save the sk we get from travelsing the tsp list.
524 if (!(idiag_states
& ~(TCPF_LISTEN
| TCPF_CLOSE
)))
527 sctp_for_each_transport(sctp_sock_filter
, sctp_sock_dump
,
532 cb
->args
[1] = cb
->args
[4];
536 static const struct inet_diag_handler sctp_diag_handler
= {
537 .dump
= sctp_diag_dump
,
538 .dump_one
= sctp_diag_dump_one
,
539 .idiag_get_info
= sctp_diag_get_info
,
540 .idiag_type
= IPPROTO_SCTP
,
541 .idiag_info_size
= sizeof(struct sctp_info
),
544 static int __init
sctp_diag_init(void)
546 return inet_diag_register(&sctp_diag_handler
);
549 static void __exit
sctp_diag_exit(void)
551 inet_diag_unregister(&sctp_diag_handler
);
554 module_init(sctp_diag_init
);
555 module_exit(sctp_diag_exit
);
556 MODULE_LICENSE("GPL");
557 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK
, NETLINK_SOCK_DIAG
, 2-132);