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Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -03001/*
2 * tcp_diag.c Module for monitoring TCP transport protocols sockets.
3 *
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -03004 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -030012#include <linux/module.h>
Lorenzo Colittic1e64e22015-12-16 12:30:05 +090013#include <linux/net.h>
14#include <linux/sock_diag.h>
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -030015#include <linux/inet_diag.h>
16
17#include <linux/tcp.h>
18
19#include <net/tcp.h>
20
21static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
22 void *_info)
23{
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -030024 struct tcp_info *info = _info;
25
Eric Dumazet00fd38d2015-11-12 08:43:18 -080026 if (sk_state_load(sk) == TCP_LISTEN) {
Sridhar Samudrala47da8ee2006-06-27 13:29:00 -070027 r->idiag_rqueue = sk->sk_ack_backlog;
Rick Jones5ee3afb2007-09-18 13:26:31 -070028 r->idiag_wqueue = sk->sk_max_ack_backlog;
Craig Gallek35ac8382015-06-15 11:26:20 -040029 } else if (sk->sk_type == SOCK_STREAM) {
30 const struct tcp_sock *tp = tcp_sk(sk);
31
Eric Dumazet49d09002009-12-03 16:06:13 -080032 r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
Rick Jones5ee3afb2007-09-18 13:26:31 -070033 r->idiag_wqueue = tp->write_seq - tp->snd_una;
34 }
Ian Morris00db4122015-04-03 09:17:27 +010035 if (info)
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -030036 tcp_get_info(sk, info);
37}
38
Pavel Emelyanov1942c512011-12-09 06:23:18 +000039static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
Eric Dumazet34160ea2015-03-10 07:15:54 -070040 const struct inet_diag_req_v2 *r, struct nlattr *bc)
Pavel Emelyanov1942c512011-12-09 06:23:18 +000041{
42 inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc);
43}
44
45static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
Eric Dumazet34160ea2015-03-10 07:15:54 -070046 const struct inet_diag_req_v2 *req)
Pavel Emelyanov1942c512011-12-09 06:23:18 +000047{
48 return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req);
49}
50
Lorenzo Colittic1e64e22015-12-16 12:30:05 +090051#ifdef CONFIG_INET_DIAG_DESTROY
52static int tcp_diag_destroy(struct sk_buff *in_skb,
53 const struct inet_diag_req_v2 *req)
54{
55 struct net *net = sock_net(in_skb->sk);
56 struct sock *sk = inet_diag_find_one_icsk(net, &tcp_hashinfo, req);
57
58 if (IS_ERR(sk))
59 return PTR_ERR(sk);
60
61 return sock_diag_destroy(sk, ECONNABORTED);
62}
63#endif
64
Eric Dumazeta7a0d6a2008-11-19 15:43:27 -080065static const struct inet_diag_handler tcp_diag_handler = {
Pavel Emelyanov1942c512011-12-09 06:23:18 +000066 .dump = tcp_diag_dump,
67 .dump_one = tcp_diag_dump_one,
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -030068 .idiag_get_info = tcp_diag_get_info,
Pavel Emelyanovf13c95f2011-12-06 08:05:24 +000069 .idiag_type = IPPROTO_TCP,
Craig Gallek3fd22af2015-06-15 11:26:19 -040070 .idiag_info_size = sizeof(struct tcp_info),
Lorenzo Colittic1e64e22015-12-16 12:30:05 +090071#ifdef CONFIG_INET_DIAG_DESTROY
72 .destroy = tcp_diag_destroy,
73#endif
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -030074};
75
76static int __init tcp_diag_init(void)
77{
78 return inet_diag_register(&tcp_diag_handler);
79}
80
81static void __exit tcp_diag_exit(void)
82{
83 inet_diag_unregister(&tcp_diag_handler);
84}
85
86module_init(tcp_diag_init);
87module_exit(tcp_diag_exit);
88MODULE_LICENSE("GPL");
Pavel Emelyanovaec8dc62011-12-15 02:43:27 +000089MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */);