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 void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
  38                struct inet_diag_req_v2 *r, struct nlattr *bc)
  39{
  40        inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc);
  41}
  42
  43static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
  44                struct inet_diag_req_v2 *req)
  45{
  46        return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req);
  47}
  48
  49static const struct inet_diag_handler tcp_diag_handler = {
  50        .dump            = tcp_diag_dump,
  51        .dump_one        = tcp_diag_dump_one,
  52        .idiag_get_info  = tcp_diag_get_info,
  53        .idiag_type      = IPPROTO_TCP,
  54};
  55
  56static int __init tcp_diag_init(void)
  57{
  58        return inet_diag_register(&tcp_diag_handler);
  59}
  60
  61static void __exit tcp_diag_exit(void)
  62{
  63        inet_diag_unregister(&tcp_diag_handler);
  64}
  65
  66module_init(tcp_diag_init);
  67module_exit(tcp_diag_exit);
  68MODULE_LICENSE("GPL");
  69MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */);
  70
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