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#include <linux/module.h>
13#include <linux/net.h>
14#include <linux/sock_diag.h>
15#include <linux/inet_diag.h>
16
17#include <linux/tcp.h>
18
19#include <net/tcp.h>
20
21static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
22			      void *_info)
23{
 
24	struct tcp_info *info = _info;
25
26	if (sk_state_load(sk) == TCP_LISTEN) {
27		r->idiag_rqueue = sk->sk_ack_backlog;
28		r->idiag_wqueue = sk->sk_max_ack_backlog;
29	} else if (sk->sk_type == SOCK_STREAM) {
30		const struct tcp_sock *tp = tcp_sk(sk);
31
32		r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
33		r->idiag_wqueue = tp->write_seq - tp->snd_una;
34	}
35	if (info)
36		tcp_get_info(sk, info);
37}
38
39static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
40			  const struct inet_diag_req_v2 *r, struct nlattr *bc)
41{
42	inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc);
43}
44
45static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
46			     const struct inet_diag_req_v2 *req)
47{
48	return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req);
49}
50
51#ifdef CONFIG_INET_DIAG_DESTROY
52static int tcp_diag_destroy(struct sk_buff *in_skb,
53			    const struct inet_diag_req_v2 *req)
54{
55	struct net *net = sock_net(in_skb->sk);
56	struct sock *sk = inet_diag_find_one_icsk(net, &tcp_hashinfo, req);
57
58	if (IS_ERR(sk))
59		return PTR_ERR(sk);
60
61	return sock_diag_destroy(sk, ECONNABORTED);
62}
63#endif
64
65static const struct inet_diag_handler tcp_diag_handler = {
66	.dump		 = tcp_diag_dump,
67	.dump_one	 = tcp_diag_dump_one,
68	.idiag_get_info	 = tcp_diag_get_info,
69	.idiag_type	 = IPPROTO_TCP,
70	.idiag_info_size = sizeof(struct tcp_info),
71#ifdef CONFIG_INET_DIAG_DESTROY
72	.destroy	 = tcp_diag_destroy,
73#endif
74};
75
76static int __init tcp_diag_init(void)
77{
78	return inet_diag_register(&tcp_diag_handler);
79}
80
81static void __exit tcp_diag_exit(void)
82{
83	inet_diag_unregister(&tcp_diag_handler);
84}
85
86module_init(tcp_diag_init);
87module_exit(tcp_diag_exit);
88MODULE_LICENSE("GPL");
89MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */);