2 * tcp_diag.c Module for monitoring TCP transport protocols sockets.
4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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.
13 #include <linux/module.h>
14 #include <linux/inet_diag.h>
16 #include <linux/tcp.h>
20 static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
23 const struct tcp_sock *tp = tcp_sk(sk);
24 struct tcp_info *info = _info;
26 if (sk->sk_state == TCP_LISTEN) {
27 r->idiag_rqueue = sk->sk_ack_backlog;
28 r->idiag_wqueue = sk->sk_max_ack_backlog;
30 r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
31 r->idiag_wqueue = tp->write_seq - tp->snd_una;
34 tcp_get_info(sk, info);
37 static const struct inet_diag_handler tcp_diag_handler = {
38 .idiag_hashinfo = &tcp_hashinfo,
39 .idiag_get_info = tcp_diag_get_info,
40 .idiag_type = IPPROTO_TCP,
41 .idiag_info_size = sizeof(struct tcp_info),
44 static int __init tcp_diag_init(void)
46 return inet_diag_register(&tcp_diag_handler);
49 static void __exit tcp_diag_exit(void)
51 inet_diag_unregister(&tcp_diag_handler);
54 module_init(tcp_diag_init);
55 module_exit(tcp_diag_exit);
56 MODULE_LICENSE("GPL");
57 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 6);