1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * tcp_diag.c Module for monitoring TCP transport protocols sockets.
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
8 #include <linux/module.h>
10 #include <linux/sock_diag.h>
11 #include <linux/inet_diag.h>
13 #include <linux/tcp.h>
15 #include <net/netlink.h>
18 static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
21 struct tcp_info *info = _info;
23 if (inet_sk_state_load(sk) == TCP_LISTEN) {
24 r->idiag_rqueue = sk->sk_ack_backlog;
25 r->idiag_wqueue = sk->sk_max_ack_backlog;
26 } else if (sk->sk_type == SOCK_STREAM) {
27 const struct tcp_sock *tp = tcp_sk(sk);
29 r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
30 r->idiag_wqueue = tp->write_seq - tp->snd_una;
33 tcp_get_info(sk, info);
36 #ifdef CONFIG_TCP_MD5SIG
37 static void tcp_diag_md5sig_fill(struct tcp_diag_md5sig *info,
38 const struct tcp_md5sig_key *key)
40 info->tcpm_family = key->family;
41 info->tcpm_prefixlen = key->prefixlen;
42 info->tcpm_keylen = key->keylen;
43 memcpy(info->tcpm_key, key->key, key->keylen);
45 if (key->family == AF_INET)
46 info->tcpm_addr[0] = key->addr.a4.s_addr;
47 #if IS_ENABLED(CONFIG_IPV6)
48 else if (key->family == AF_INET6)
49 memcpy(&info->tcpm_addr, &key->addr.a6,
50 sizeof(info->tcpm_addr));
54 static int tcp_diag_put_md5sig(struct sk_buff *skb,
55 const struct tcp_md5sig_info *md5sig)
57 const struct tcp_md5sig_key *key;
58 struct tcp_diag_md5sig *info;
62 hlist_for_each_entry_rcu(key, &md5sig->head, node)
64 if (md5sig_count == 0)
67 attr = nla_reserve(skb, INET_DIAG_MD5SIG,
68 md5sig_count * sizeof(struct tcp_diag_md5sig));
72 info = nla_data(attr);
73 memset(info, 0, md5sig_count * sizeof(struct tcp_diag_md5sig));
74 hlist_for_each_entry_rcu(key, &md5sig->head, node) {
75 tcp_diag_md5sig_fill(info++, key);
76 if (--md5sig_count == 0)
84 static int tcp_diag_put_ulp(struct sk_buff *skb, struct sock *sk,
85 const struct tcp_ulp_ops *ulp_ops)
90 nest = nla_nest_start_noflag(skb, INET_DIAG_ULP_INFO);
94 err = nla_put_string(skb, INET_ULP_INFO_NAME, ulp_ops->name);
98 if (ulp_ops->get_info)
99 err = ulp_ops->get_info(sk, skb);
103 nla_nest_end(skb, nest);
107 nla_nest_cancel(skb, nest);
111 static int tcp_diag_get_aux(struct sock *sk, bool net_admin,
114 struct inet_connection_sock *icsk = inet_csk(sk);
117 #ifdef CONFIG_TCP_MD5SIG
119 struct tcp_md5sig_info *md5sig;
122 md5sig = rcu_dereference(tcp_sk(sk)->md5sig_info);
124 err = tcp_diag_put_md5sig(skb, md5sig);
132 const struct tcp_ulp_ops *ulp_ops;
134 ulp_ops = icsk->icsk_ulp_ops;
136 err = tcp_diag_put_ulp(skb, sk, ulp_ops);
143 static size_t tcp_diag_get_aux_size(struct sock *sk, bool net_admin)
145 struct inet_connection_sock *icsk = inet_csk(sk);
148 #ifdef CONFIG_TCP_MD5SIG
149 if (net_admin && sk_fullsock(sk)) {
150 const struct tcp_md5sig_info *md5sig;
151 const struct tcp_md5sig_key *key;
152 size_t md5sig_count = 0;
155 md5sig = rcu_dereference(tcp_sk(sk)->md5sig_info);
157 hlist_for_each_entry_rcu(key, &md5sig->head, node)
161 size += nla_total_size(md5sig_count *
162 sizeof(struct tcp_diag_md5sig));
167 const struct tcp_ulp_ops *ulp_ops;
169 ulp_ops = icsk->icsk_ulp_ops;
171 size += nla_total_size(0) +
172 nla_total_size(TCP_ULP_NAME_MAX);
173 if (ulp_ops->get_info_size)
174 size += ulp_ops->get_info_size(sk);
180 static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
181 const struct inet_diag_req_v2 *r, struct nlattr *bc)
183 inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc);
186 static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
187 const struct inet_diag_req_v2 *req)
189 return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req);
192 #ifdef CONFIG_INET_DIAG_DESTROY
193 static int tcp_diag_destroy(struct sk_buff *in_skb,
194 const struct inet_diag_req_v2 *req)
196 struct net *net = sock_net(in_skb->sk);
197 struct sock *sk = inet_diag_find_one_icsk(net, &tcp_hashinfo, req);
203 err = sock_diag_destroy(sk, ECONNABORTED);
211 static const struct inet_diag_handler tcp_diag_handler = {
212 .dump = tcp_diag_dump,
213 .dump_one = tcp_diag_dump_one,
214 .idiag_get_info = tcp_diag_get_info,
215 .idiag_get_aux = tcp_diag_get_aux,
216 .idiag_get_aux_size = tcp_diag_get_aux_size,
217 .idiag_type = IPPROTO_TCP,
218 .idiag_info_size = sizeof(struct tcp_info),
219 #ifdef CONFIG_INET_DIAG_DESTROY
220 .destroy = tcp_diag_destroy,
224 static int __init tcp_diag_init(void)
226 return inet_diag_register(&tcp_diag_handler);
229 static void __exit tcp_diag_exit(void)
231 inet_diag_unregister(&tcp_diag_handler);
234 module_init(tcp_diag_init);
235 module_exit(tcp_diag_exit);
236 MODULE_LICENSE("GPL");
237 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */);