net/ipv4/tcp_diag.c

   1 /*
   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
  14
  15 #include <linux/module.h>
  16 #include <linux/inet_diag.h>
  17
  18 #include <linux/tcp.h>
  19
  20 #include <net/tcp.h>
  21
  22 static 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
  28         if (sk->sk_state == TCP_LISTEN) {
  29                 r->idiag_rqueue = sk->sk_ack_backlog;
  30                 r->idiag_wqueue = sk->sk_max_ack_backlog;
  31         } else {
  32                 r->idiag_rqueue = tp->rcv_nxt - tp->copied_seq;
  33                 r->idiag_wqueue = tp->write_seq - tp->snd_una;
  34         }
  35         if (info != NULL)
  36                 tcp_get_info(sk, info);
  37 }
  38
  39 static 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
  46 static int __init tcp_diag_init(void)
  47 {
  48         return inet_diag_register(&tcp_diag_handler);
  49 }
  50
  51 static void __exit tcp_diag_exit(void)
  52 {
  53         inet_diag_unregister(&tcp_diag_handler);
  54 }
  55
  56 module_init(tcp_diag_init);
  57 module_exit(tcp_diag_exit);
  58 MODULE_LICENSE("GPL");
  59 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_INET_DIAG, TCPDIAG_GETSOCK);