linux/net/ipv4/tcp_diag.c
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   1/*
   2 * tcp_diag.c   Module for monitoring TCP transport protocols sockets.
   3 *
   4 * 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
  12
  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
  26        if (sk->sk_state == TCP_LISTEN) {
  27                r->idiag_rqueue = sk->sk_ack_backlog;
  28                r->idiag_wqueue = sk->sk_max_ack_backlog;
  29        } else {
  30                r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
  31                r->idiag_wqueue = tp->write_seq - tp->snd_una;
  32        }
  33        if (info != NULL)
  34                tcp_get_info(sk, info);
  35}
  36
  37static const struct inet_diag_handler tcp_diag_handler = {
  38        .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");
  57MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_INET_DIAG, TCPDIAG_GETSOCK);
  58