/* * tcp_diag.c Module for monitoring TCP transport protocols sockets. * * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/module.h> #include <linux/inet_diag.h> #include <linux/tcp.h> #include <net/tcp.h> static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, void *_info) { const struct tcp_sock *tp = tcp_sk(sk); struct tcp_info *info = _info; if (sk->sk_state == TCP_LISTEN) { r->idiag_rqueue = sk->sk_ack_backlog; r->idiag_wqueue = sk->sk_max_ack_backlog; } else { r->idiag_rqueue = tp->rcv_nxt - tp->copied_seq; r->idiag_wqueue = tp->write_seq - tp->snd_una; } if (info != NULL) tcp_get_info(sk, info); } static const struct inet_diag_handler tcp_diag_handler = { .idiag_hashinfo = &tcp_hashinfo, .idiag_get_info = tcp_diag_get_info, .idiag_type = TCPDIAG_GETSOCK, .idiag_info_size = sizeof(struct tcp_info), }; static int __init tcp_diag_init(void) { return inet_diag_register(&tcp_diag_handler); } static void __exit tcp_diag_exit(void) { inet_diag_unregister(&tcp_diag_handler); } module_init(tcp_diag_init); module_exit(tcp_diag_exit); MODULE_LICENSE("GPL"); MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_INET_DIAG, TCPDIAG_GETSOCK);