blob: 939edb3b8e4dcf6f4d4661cd44c0664a1d7b2313 [file] [log] [blame]
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
13#include <linux/module.h>
14#include <linux/inet_diag.h>
15
16#include <linux/tcp.h>
17
18#include <net/tcp.h>
19
20static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
21 void *_info)
22{
23 const struct tcp_sock *tp = tcp_sk(sk);
24 struct tcp_info *info = _info;
25
Rick Jones5ee3afb2007-09-18 13:26:31 -070026 if (sk->sk_state == 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;
29 } else {
Eric Dumazet49d09002009-12-03 16:06:13 -080030 r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
Rick Jones5ee3afb2007-09-18 13:26:31 -070031 r->idiag_wqueue = tp->write_seq - tp->snd_una;
32 }
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -030033 if (info != NULL)
34 tcp_get_info(sk, info);
35}
36
Eric Dumazeta7a0d6a2008-11-19 15:43:27 -080037static const struct inet_diag_handler tcp_diag_handler = {
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -030038 .idiag_hashinfo = &tcp_hashinfo,
39 .idiag_get_info = tcp_diag_get_info,
40 .idiag_type = TCPDIAG_GETSOCK,
41 .idiag_info_size = sizeof(struct tcp_info),
42};
43
44static int __init tcp_diag_init(void)
45{
46 return inet_diag_register(&tcp_diag_handler);
47}
48
49static void __exit tcp_diag_exit(void)
50{
51 inet_diag_unregister(&tcp_diag_handler);
52}
53
54module_init(tcp_diag_init);
55module_exit(tcp_diag_exit);
56MODULE_LICENSE("GPL");
Jean Delvare305e1e92007-10-21 16:44:04 -070057MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_INET_DIAG, TCPDIAG_GETSOCK);