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89 lines
2.4 KiB
89 lines
2.4 KiB
/* |
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* tcp_diag.c Module for monitoring TCP transport protocols sockets. |
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* |
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version |
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* 2 of the License, or (at your option) any later version. |
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*/ |
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#include <linux/module.h> |
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#include <linux/net.h> |
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#include <linux/sock_diag.h> |
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#include <linux/inet_diag.h> |
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#include <linux/tcp.h> |
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#include <net/tcp.h> |
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static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, |
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void *_info) |
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{ |
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struct tcp_info *info = _info; |
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if (sk_state_load(sk) == TCP_LISTEN) { |
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r->idiag_rqueue = sk->sk_ack_backlog; |
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r->idiag_wqueue = sk->sk_max_ack_backlog; |
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} else if (sk->sk_type == SOCK_STREAM) { |
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const struct tcp_sock *tp = tcp_sk(sk); |
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r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); |
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r->idiag_wqueue = tp->write_seq - tp->snd_una; |
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} |
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if (info) |
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tcp_get_info(sk, info); |
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} |
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static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, |
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const struct inet_diag_req_v2 *r, struct nlattr *bc) |
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{ |
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inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc); |
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} |
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static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh, |
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const struct inet_diag_req_v2 *req) |
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{ |
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return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req); |
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} |
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#ifdef CONFIG_INET_DIAG_DESTROY |
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static int tcp_diag_destroy(struct sk_buff *in_skb, |
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const struct inet_diag_req_v2 *req) |
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{ |
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struct net *net = sock_net(in_skb->sk); |
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struct sock *sk = inet_diag_find_one_icsk(net, &tcp_hashinfo, req); |
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if (IS_ERR(sk)) |
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return PTR_ERR(sk); |
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return sock_diag_destroy(sk, ECONNABORTED); |
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} |
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#endif |
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static const struct inet_diag_handler tcp_diag_handler = { |
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.dump = tcp_diag_dump, |
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.dump_one = tcp_diag_dump_one, |
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.idiag_get_info = tcp_diag_get_info, |
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.idiag_type = IPPROTO_TCP, |
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.idiag_info_size = sizeof(struct tcp_info), |
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#ifdef CONFIG_INET_DIAG_DESTROY |
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.destroy = tcp_diag_destroy, |
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#endif |
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}; |
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static int __init tcp_diag_init(void) |
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{ |
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return inet_diag_register(&tcp_diag_handler); |
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} |
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static void __exit tcp_diag_exit(void) |
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{ |
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inet_diag_unregister(&tcp_diag_handler); |
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} |
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module_init(tcp_diag_init); |
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module_exit(tcp_diag_exit); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */);
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