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/inet_diag.h> 14 15 #include <linux/tcp.h> 16 17 #include <net/tcp.h> 18 19 static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, 20 void *_info) 21 { 22 const struct tcp_sock *tp = tcp_sk(sk); 23 struct tcp_info *info = _info; 24 25 if (sk->sk_state == TCP_LISTEN) { 26 r->idiag_rqueue = sk->sk_ack_backlog; 27 r->idiag_wqueue = sk->sk_max_ack_backlog; 28 } else { 29 r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); 30 r->idiag_wqueue = tp->write_seq - tp->snd_una; 31 } 32 if (info) 33 tcp_get_info(sk, info); 34 } 35 36 static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 37 const struct inet_diag_req_v2 *r, struct nlattr *bc) 38 { 39 inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc); 40 } 41 42 static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh, 43 const struct inet_diag_req_v2 *req) 44 { 45 return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req); 46 } 47 48 static const struct inet_diag_handler tcp_diag_handler = { 49 .dump = tcp_diag_dump, 50 .dump_one = tcp_diag_dump_one, 51 .idiag_get_info = tcp_diag_get_info, 52 .idiag_type = IPPROTO_TCP, 53 }; 54 55 static int __init tcp_diag_init(void) 56 { 57 return inet_diag_register(&tcp_diag_handler); 58 } 59 60 static void __exit tcp_diag_exit(void) 61 { 62 inet_diag_unregister(&tcp_diag_handler); 63 } 64 65 module_init(tcp_diag_init); 66 module_exit(tcp_diag_exit); 67 MODULE_LICENSE("GPL"); 68 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */); 69