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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 *
4 * Version: $Id: tcp_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $
5 *
6 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -030014
15#include <linux/module.h>
16#include <linux/inet_diag.h>
17
18#include <linux/tcp.h>
19
20#include <net/tcp.h>
21
22static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
23 void *_info)
24{
25 const struct tcp_sock *tp = tcp_sk(sk);
26 struct tcp_info *info = _info;
27
Rick Jones5ee3afb2007-09-18 13:26:31 -070028 if (sk->sk_state == TCP_LISTEN) {
Sridhar Samudrala47da8ee2006-06-27 13:29:00 -070029 r->idiag_rqueue = sk->sk_ack_backlog;
Rick Jones5ee3afb2007-09-18 13:26:31 -070030 r->idiag_wqueue = sk->sk_max_ack_backlog;
31 } else {
Sridhar Samudrala47da8ee2006-06-27 13:29:00 -070032 r->idiag_rqueue = tp->rcv_nxt - tp->copied_seq;
Rick Jones5ee3afb2007-09-18 13:26:31 -070033 r->idiag_wqueue = tp->write_seq - tp->snd_una;
34 }
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -030035 if (info != NULL)
36 tcp_get_info(sk, info);
37}
38
39static struct inet_diag_handler tcp_diag_handler = {
40 .idiag_hashinfo = &tcp_hashinfo,
41 .idiag_get_info = tcp_diag_get_info,
42 .idiag_type = TCPDIAG_GETSOCK,
43 .idiag_info_size = sizeof(struct tcp_info),
44};
45
46static int __init tcp_diag_init(void)
47{
48 return inet_diag_register(&tcp_diag_handler);
49}
50
51static void __exit tcp_diag_exit(void)
52{
53 inet_diag_unregister(&tcp_diag_handler);
54}
55
56module_init(tcp_diag_init);
57module_exit(tcp_diag_exit);
58MODULE_LICENSE("GPL");
Jean Delvare305e1e92007-10-21 16:44:04 -070059MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_INET_DIAG, TCPDIAG_GETSOCK);