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 */);

 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);