117b085eaSArnaldo Carvalho de Melo /* 217b085eaSArnaldo Carvalho de Melo * tcp_diag.c Module for monitoring TCP transport protocols sockets. 317b085eaSArnaldo Carvalho de Melo * 417b085eaSArnaldo Carvalho de Melo * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 517b085eaSArnaldo Carvalho de Melo * 617b085eaSArnaldo Carvalho de Melo * This program is free software; you can redistribute it and/or 717b085eaSArnaldo Carvalho de Melo * modify it under the terms of the GNU General Public License 817b085eaSArnaldo Carvalho de Melo * as published by the Free Software Foundation; either version 917b085eaSArnaldo Carvalho de Melo * 2 of the License, or (at your option) any later version. 1017b085eaSArnaldo Carvalho de Melo */ 1117b085eaSArnaldo Carvalho de Melo 1217b085eaSArnaldo Carvalho de Melo #include <linux/module.h> 1317b085eaSArnaldo Carvalho de Melo #include <linux/inet_diag.h> 1417b085eaSArnaldo Carvalho de Melo 1517b085eaSArnaldo Carvalho de Melo #include <linux/tcp.h> 1617b085eaSArnaldo Carvalho de Melo 1717b085eaSArnaldo Carvalho de Melo #include <net/tcp.h> 1817b085eaSArnaldo Carvalho de Melo 1917b085eaSArnaldo Carvalho de Melo static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, 2017b085eaSArnaldo Carvalho de Melo void *_info) 2117b085eaSArnaldo Carvalho de Melo { 2217b085eaSArnaldo Carvalho de Melo struct tcp_info *info = _info; 2317b085eaSArnaldo Carvalho de Melo 245ee3afbaSRick Jones if (sk->sk_state == TCP_LISTEN) { 2547da8ee6SSridhar Samudrala r->idiag_rqueue = sk->sk_ack_backlog; 265ee3afbaSRick Jones r->idiag_wqueue = sk->sk_max_ack_backlog; 2735ac838aSCraig Gallek } else if (sk->sk_type == SOCK_STREAM) { 2835ac838aSCraig Gallek const struct tcp_sock *tp = tcp_sk(sk); 2935ac838aSCraig Gallek 3049d09007SEric Dumazet r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); 3117b085eaSArnaldo Carvalho de Melo r->idiag_wqueue = tp->write_seq - tp->snd_una; 325ee3afbaSRick Jones } 3300db4124SIan Morris if (info) 3417b085eaSArnaldo Carvalho de Melo tcp_get_info(sk, info); 3517b085eaSArnaldo Carvalho de Melo } 3617b085eaSArnaldo Carvalho de Melo 371942c518SPavel Emelyanov static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 3834160ea3SEric Dumazet const struct inet_diag_req_v2 *r, struct nlattr *bc) 391942c518SPavel Emelyanov { 401942c518SPavel Emelyanov inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc); 411942c518SPavel Emelyanov } 421942c518SPavel Emelyanov 431942c518SPavel Emelyanov static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh, 4434160ea3SEric Dumazet const struct inet_diag_req_v2 *req) 451942c518SPavel Emelyanov { 461942c518SPavel Emelyanov return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req); 471942c518SPavel Emelyanov } 481942c518SPavel Emelyanov 49a7a0d6a8SEric Dumazet static const struct inet_diag_handler tcp_diag_handler = { 501942c518SPavel Emelyanov .dump = tcp_diag_dump, 511942c518SPavel Emelyanov .dump_one = tcp_diag_dump_one, 5217b085eaSArnaldo Carvalho de Melo .idiag_get_info = tcp_diag_get_info, 53f13c95f0SPavel Emelyanov .idiag_type = IPPROTO_TCP, 543fd22af8SCraig Gallek .idiag_info_size = sizeof(struct tcp_info), 5517b085eaSArnaldo Carvalho de Melo }; 5617b085eaSArnaldo Carvalho de Melo 5717b085eaSArnaldo Carvalho de Melo static int __init tcp_diag_init(void) 5817b085eaSArnaldo Carvalho de Melo { 5917b085eaSArnaldo Carvalho de Melo return inet_diag_register(&tcp_diag_handler); 6017b085eaSArnaldo Carvalho de Melo } 6117b085eaSArnaldo Carvalho de Melo 6217b085eaSArnaldo Carvalho de Melo static void __exit tcp_diag_exit(void) 6317b085eaSArnaldo Carvalho de Melo { 6417b085eaSArnaldo Carvalho de Melo inet_diag_unregister(&tcp_diag_handler); 6517b085eaSArnaldo Carvalho de Melo } 6617b085eaSArnaldo Carvalho de Melo 6717b085eaSArnaldo Carvalho de Melo module_init(tcp_diag_init); 6817b085eaSArnaldo Carvalho de Melo module_exit(tcp_diag_exit); 6917b085eaSArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 70aec8dc62SPavel Emelyanov MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */); 71