Commit | Line | Data |
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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 | 12 | #include <linux/module.h> |
c1e64e29 LC |
13 | #include <linux/net.h> |
14 | #include <linux/sock_diag.h> | |
17b085ea ACM |
15 | #include <linux/inet_diag.h> |
16 | ||
17 | #include <linux/tcp.h> | |
18 | ||
19 | #include <net/tcp.h> | |
20 | ||
21 | static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, | |
22 | void *_info) | |
23 | { | |
17b085ea ACM |
24 | struct tcp_info *info = _info; |
25 | ||
00fd38d9 | 26 | if (sk_state_load(sk) == TCP_LISTEN) { |
47da8ee6 | 27 | r->idiag_rqueue = sk->sk_ack_backlog; |
5ee3afba | 28 | r->idiag_wqueue = sk->sk_max_ack_backlog; |
35ac838a CG |
29 | } else if (sk->sk_type == SOCK_STREAM) { |
30 | const struct tcp_sock *tp = tcp_sk(sk); | |
31 | ||
49d09007 | 32 | r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); |
5ee3afba RJ |
33 | r->idiag_wqueue = tp->write_seq - tp->snd_una; |
34 | } | |
00db4124 | 35 | if (info) |
17b085ea ACM |
36 | tcp_get_info(sk, info); |
37 | } | |
38 | ||
1942c518 | 39 | static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, |
34160ea3 | 40 | const struct inet_diag_req_v2 *r, struct nlattr *bc) |
1942c518 PE |
41 | { |
42 | inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc); | |
43 | } | |
44 | ||
45 | static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh, | |
34160ea3 | 46 | const struct inet_diag_req_v2 *req) |
1942c518 PE |
47 | { |
48 | return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req); | |
49 | } | |
50 | ||
c1e64e29 LC |
51 | #ifdef CONFIG_INET_DIAG_DESTROY |
52 | static 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 | ||
a7a0d6a8 | 65 | static const struct inet_diag_handler tcp_diag_handler = { |
1942c518 PE |
66 | .dump = tcp_diag_dump, |
67 | .dump_one = tcp_diag_dump_one, | |
17b085ea | 68 | .idiag_get_info = tcp_diag_get_info, |
f13c95f0 | 69 | .idiag_type = IPPROTO_TCP, |
3fd22af8 | 70 | .idiag_info_size = sizeof(struct tcp_info), |
c1e64e29 LC |
71 | #ifdef CONFIG_INET_DIAG_DESTROY |
72 | .destroy = tcp_diag_destroy, | |
73 | #endif | |
17b085ea ACM |
74 | }; |
75 | ||
76 | static int __init tcp_diag_init(void) | |
77 | { | |
78 | return inet_diag_register(&tcp_diag_handler); | |
79 | } | |
80 | ||
81 | static void __exit tcp_diag_exit(void) | |
82 | { | |
83 | inet_diag_unregister(&tcp_diag_handler); | |
84 | } | |
85 | ||
86 | module_init(tcp_diag_init); | |
87 | module_exit(tcp_diag_exit); | |
88 | MODULE_LICENSE("GPL"); | |
aec8dc62 | 89 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */); |