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 #include <linux/config.h>
  15
  16 #include <linux/module.h>
  17 #include <linux/inet_diag.h>
  18
  19 #include <linux/tcp.h>
  20
  21 #include <net/tcp.h>
  22
  23 static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
  24                               void *_info)
  25 {
  26         const struct tcp_sock *tp = tcp_sk(sk);
  27         struct tcp_info *info = _info;
  28
  29         r->idiag_rqueue = tp->rcv_nxt - tp->copied_seq;
  30         r->idiag_wqueue = tp->write_seq - tp->snd_una;
  31         if (info != NULL)
  32                 tcp_get_info(sk, info);
  33 }
  34
  35 static struct inet_diag_handler tcp_diag_handler = {
  36         .idiag_hashinfo  = &tcp_hashinfo,
  37         .idiag_get_info  = tcp_diag_get_info,
  38         .idiag_type      = TCPDIAG_GETSOCK,
  39         .idiag_info_size = sizeof(struct tcp_info),
  40 };
  41
  42 static int __init tcp_diag_init(void)
  43 {
  44         return inet_diag_register(&tcp_diag_handler);
  45 }
  46
  47 static void __exit tcp_diag_exit(void)
  48 {
  49         inet_diag_unregister(&tcp_diag_handler);
  50 }
  51
  52 module_init(tcp_diag_init);
  53 module_exit(tcp_diag_exit);
  54 MODULE_LICENSE("GPL");