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> 13c1e64e29SLorenzo Colitti #include <linux/net.h> 14c1e64e29SLorenzo Colitti #include <linux/sock_diag.h> 1517b085eaSArnaldo Carvalho de Melo #include <linux/inet_diag.h> 1617b085eaSArnaldo Carvalho de Melo 1717b085eaSArnaldo Carvalho de Melo #include <linux/tcp.h> 1817b085eaSArnaldo Carvalho de Melo 1917b085eaSArnaldo Carvalho de Melo #include <net/tcp.h> 2017b085eaSArnaldo Carvalho de Melo 2117b085eaSArnaldo Carvalho de Melo static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, 2217b085eaSArnaldo Carvalho de Melo void *_info) 2317b085eaSArnaldo Carvalho de Melo { 2417b085eaSArnaldo Carvalho de Melo struct tcp_info *info = _info; 2517b085eaSArnaldo Carvalho de Melo 2600fd38d9SEric Dumazet if (sk_state_load(sk) == TCP_LISTEN) { 2747da8ee6SSridhar Samudrala r->idiag_rqueue = sk->sk_ack_backlog; 285ee3afbaSRick Jones r->idiag_wqueue = sk->sk_max_ack_backlog; 2935ac838aSCraig Gallek } else if (sk->sk_type == SOCK_STREAM) { 3035ac838aSCraig Gallek const struct tcp_sock *tp = tcp_sk(sk); 3135ac838aSCraig Gallek 3249d09007SEric Dumazet r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); 3317b085eaSArnaldo Carvalho de Melo r->idiag_wqueue = tp->write_seq - tp->snd_una; 345ee3afbaSRick Jones } 3500db4124SIan Morris if (info) 3617b085eaSArnaldo Carvalho de Melo tcp_get_info(sk, info); 3717b085eaSArnaldo Carvalho de Melo } 3817b085eaSArnaldo Carvalho de Melo 391942c518SPavel Emelyanov static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 4034160ea3SEric Dumazet const struct inet_diag_req_v2 *r, struct nlattr *bc) 411942c518SPavel Emelyanov { 421942c518SPavel Emelyanov inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc); 431942c518SPavel Emelyanov } 441942c518SPavel Emelyanov 451942c518SPavel Emelyanov static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh, 4634160ea3SEric Dumazet const struct inet_diag_req_v2 *req) 471942c518SPavel Emelyanov { 481942c518SPavel Emelyanov return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req); 491942c518SPavel Emelyanov } 501942c518SPavel Emelyanov 51c1e64e29SLorenzo Colitti #ifdef CONFIG_INET_DIAG_DESTROY 52c1e64e29SLorenzo Colitti static int tcp_diag_destroy(struct sk_buff *in_skb, 53c1e64e29SLorenzo Colitti const struct inet_diag_req_v2 *req) 54c1e64e29SLorenzo Colitti { 55c1e64e29SLorenzo Colitti struct net *net = sock_net(in_skb->sk); 56c1e64e29SLorenzo Colitti struct sock *sk = inet_diag_find_one_icsk(net, &tcp_hashinfo, req); 57d7226c7aSDavid Ahern int err; 58c1e64e29SLorenzo Colitti 59c1e64e29SLorenzo Colitti if (IS_ERR(sk)) 60c1e64e29SLorenzo Colitti return PTR_ERR(sk); 61c1e64e29SLorenzo Colitti 62d7226c7aSDavid Ahern err = sock_diag_destroy(sk, ECONNABORTED); 63d7226c7aSDavid Ahern 64d7226c7aSDavid Ahern sock_gen_put(sk); 65d7226c7aSDavid Ahern 66d7226c7aSDavid Ahern return err; 67c1e64e29SLorenzo Colitti } 68c1e64e29SLorenzo Colitti #endif 69c1e64e29SLorenzo Colitti 70a7a0d6a8SEric Dumazet static const struct inet_diag_handler tcp_diag_handler = { 711942c518SPavel Emelyanov .dump = tcp_diag_dump, 721942c518SPavel Emelyanov .dump_one = tcp_diag_dump_one, 7317b085eaSArnaldo Carvalho de Melo .idiag_get_info = tcp_diag_get_info, 74f13c95f0SPavel Emelyanov .idiag_type = IPPROTO_TCP, 753fd22af8SCraig Gallek .idiag_info_size = sizeof(struct tcp_info), 76c1e64e29SLorenzo Colitti #ifdef CONFIG_INET_DIAG_DESTROY 77c1e64e29SLorenzo Colitti .destroy = tcp_diag_destroy, 78c1e64e29SLorenzo Colitti #endif 7917b085eaSArnaldo Carvalho de Melo }; 8017b085eaSArnaldo Carvalho de Melo 8117b085eaSArnaldo Carvalho de Melo static int __init tcp_diag_init(void) 8217b085eaSArnaldo Carvalho de Melo { 8317b085eaSArnaldo Carvalho de Melo return inet_diag_register(&tcp_diag_handler); 8417b085eaSArnaldo Carvalho de Melo } 8517b085eaSArnaldo Carvalho de Melo 8617b085eaSArnaldo Carvalho de Melo static void __exit tcp_diag_exit(void) 8717b085eaSArnaldo Carvalho de Melo { 8817b085eaSArnaldo Carvalho de Melo inet_diag_unregister(&tcp_diag_handler); 8917b085eaSArnaldo Carvalho de Melo } 9017b085eaSArnaldo Carvalho de Melo 9117b085eaSArnaldo Carvalho de Melo module_init(tcp_diag_init); 9217b085eaSArnaldo Carvalho de Melo module_exit(tcp_diag_exit); 9317b085eaSArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 94aec8dc62SPavel Emelyanov MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */); 95