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17b085ea ACM |
1 | /* |
2 | * tcp_diag.c Module for monitoring TCP transport protocols sockets. | |
3 | * | |
17b085ea ACM |
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 | ||
17b085ea ACM |
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 | ||
20 | static 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 | ||
5ee3afba | 26 | if (sk->sk_state == TCP_LISTEN) { |
47da8ee6 | 27 | r->idiag_rqueue = sk->sk_ack_backlog; |
5ee3afba RJ |
28 | r->idiag_wqueue = sk->sk_max_ack_backlog; |
29 | } else { | |
49d09007 | 30 | r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); |
5ee3afba RJ |
31 | r->idiag_wqueue = tp->write_seq - tp->snd_una; |
32 | } | |
17b085ea ACM |
33 | if (info != NULL) |
34 | tcp_get_info(sk, info); | |
35 | } | |
36 | ||
a7a0d6a8 | 37 | static const struct inet_diag_handler tcp_diag_handler = { |
17b085ea ACM |
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 | ||
44 | static int __init tcp_diag_init(void) | |
45 | { | |
46 | return inet_diag_register(&tcp_diag_handler); | |
47 | } | |
48 | ||
49 | static void __exit tcp_diag_exit(void) | |
50 | { | |
51 | inet_diag_unregister(&tcp_diag_handler); | |
52 | } | |
53 | ||
54 | module_init(tcp_diag_init); | |
55 | module_exit(tcp_diag_exit); | |
56 | MODULE_LICENSE("GPL"); | |
305e1e96 | 57 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_INET_DIAG, TCPDIAG_GETSOCK); |