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/net.h> 14 #include <linux/sock_diag.h> 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 { 24 struct tcp_info *info = _info; 25 26 if (sk_state_load(sk) == TCP_LISTEN) { 27 r->idiag_rqueue = sk->sk_ack_backlog; 28 r->idiag_wqueue = sk->sk_max_ack_backlog; 29 } else if (sk->sk_type == SOCK_STREAM) { 30 const struct tcp_sock *tp = tcp_sk(sk); 31 32 r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); 33 r->idiag_wqueue = tp->write_seq - tp->snd_una; 34 } 35 if (info) 36 tcp_get_info(sk, info); 37 } 38 39 static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 40 const struct inet_diag_req_v2 *r, struct nlattr *bc) 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, 46 const struct inet_diag_req_v2 *req) 47 { 48 return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req); 49 } 50 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 int err; 58 59 if (IS_ERR(sk)) 60 return PTR_ERR(sk); 61 62 err = sock_diag_destroy(sk, ECONNABORTED); 63 64 sock_gen_put(sk); 65 66 return err; 67 } 68 #endif 69 70 static const struct inet_diag_handler tcp_diag_handler = { 71 .dump = tcp_diag_dump, 72 .dump_one = tcp_diag_dump_one, 73 .idiag_get_info = tcp_diag_get_info, 74 .idiag_type = IPPROTO_TCP, 75 .idiag_info_size = sizeof(struct tcp_info), 76 #ifdef CONFIG_INET_DIAG_DESTROY 77 .destroy = tcp_diag_destroy, 78 #endif 79 }; 80 81 static int __init tcp_diag_init(void) 82 { 83 return inet_diag_register(&tcp_diag_handler); 84 } 85 86 static void __exit tcp_diag_exit(void) 87 { 88 inet_diag_unregister(&tcp_diag_handler); 89 } 90 91 module_init(tcp_diag_init); 92 module_exit(tcp_diag_exit); 93 MODULE_LICENSE("GPL"); 94 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */); 95