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Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -03001/*
2 * tcp_diag.c Module for monitoring TCP transport protocols sockets.
3 *
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -03004 * 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
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -030012
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
Rick Jones5ee3afb2007-09-18 13:26:31 -070026 if (sk->sk_state == TCP_LISTEN) {
Sridhar Samudrala47da8ee2006-06-27 13:29:00 -070027 r->idiag_rqueue = sk->sk_ack_backlog;
Rick Jones5ee3afb2007-09-18 13:26:31 -070028 r->idiag_wqueue = sk->sk_max_ack_backlog;
29 } else {
Eric Dumazet49d09002009-12-03 16:06:13 -080030 r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
Rick Jones5ee3afb2007-09-18 13:26:31 -070031 r->idiag_wqueue = tp->write_seq - tp->snd_una;
32 }
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -030033 if (info != NULL)
34 tcp_get_info(sk, info);
35}
36
Pavel Emelyanov1942c512011-12-09 06:23:18 +000037static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
Pavel Emelyanovc8991362012-01-10 22:36:35 +000038 struct inet_diag_req_v2 *r, struct nlattr *bc)
Pavel Emelyanov1942c512011-12-09 06:23:18 +000039{
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,
Pavel Emelyanovc8991362012-01-10 22:36:35 +000044 struct inet_diag_req_v2 *req)
Pavel Emelyanov1942c512011-12-09 06:23:18 +000045{
46 return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req);
47}
48
Eric Dumazeta7a0d6a2008-11-19 15:43:27 -080049static const struct inet_diag_handler tcp_diag_handler = {
Pavel Emelyanov1942c512011-12-09 06:23:18 +000050 .dump = tcp_diag_dump,
51 .dump_one = tcp_diag_dump_one,
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -030052 .idiag_get_info = tcp_diag_get_info,
Pavel Emelyanovf13c95f2011-12-06 08:05:24 +000053 .idiag_type = IPPROTO_TCP,
Arnaldo Carvalho de Melo17b085e2005-08-12 12:59:17 -030054};
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");
Pavel Emelyanovaec8dc62011-12-15 02:43:27 +000069MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */);