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