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 = READ_ONCE(sk->sk_ack_backlog);
25 r->idiag_wqueue = READ_ONCE(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, READ_ONCE(tp->rcv_nxt) -
30 READ_ONCE(tp->copied_seq), 0);
31 r->idiag_wqueue = READ_ONCE(tp->write_seq) - tp->snd_una;
34 tcp_get_info(sk, info);
37 #ifdef CONFIG_TCP_MD5SIG
38 static void tcp_diag_md5sig_fill(struct tcp_diag_md5sig *info,
39 const struct tcp_md5sig_key *key)
41 info->tcpm_family = key->family;
42 info->tcpm_prefixlen = key->prefixlen;
43 info->tcpm_keylen = key->keylen;
44 memcpy(info->tcpm_key, key->key, key->keylen);
46 if (key->family == AF_INET)
47 info->tcpm_addr[0] = key->addr.a4.s_addr;
48 #if IS_ENABLED(CONFIG_IPV6)
49 else if (key->family == AF_INET6)
50 memcpy(&info->tcpm_addr, &key->addr.a6,
51 sizeof(info->tcpm_addr));
55 static int tcp_diag_put_md5sig(struct sk_buff *skb,
56 const struct tcp_md5sig_info *md5sig)
58 const struct tcp_md5sig_key *key;
59 struct tcp_diag_md5sig *info;
63 hlist_for_each_entry_rcu(key, &md5sig->head, node)
65 if (md5sig_count == 0)
68 attr = nla_reserve(skb, INET_DIAG_MD5SIG,
69 md5sig_count * sizeof(struct tcp_diag_md5sig));
73 info = nla_data(attr);
74 memset(info, 0, md5sig_count * sizeof(struct tcp_diag_md5sig));
75 hlist_for_each_entry_rcu(key, &md5sig->head, node) {
76 tcp_diag_md5sig_fill(info++, key);
77 if (--md5sig_count == 0)
85 static int tcp_diag_put_ulp(struct sk_buff *skb, struct sock *sk,
86 const struct tcp_ulp_ops *ulp_ops)
91 nest = nla_nest_start_noflag(skb, INET_DIAG_ULP_INFO);
95 err = nla_put_string(skb, INET_ULP_INFO_NAME, ulp_ops->name);
99 if (ulp_ops->get_info)
100 err = ulp_ops->get_info(sk, skb);
104 nla_nest_end(skb, nest);
108 nla_nest_cancel(skb, nest);
112 static int tcp_diag_get_aux(struct sock *sk, bool net_admin,
115 struct inet_connection_sock *icsk = inet_csk(sk);
118 #ifdef CONFIG_TCP_MD5SIG
120 struct tcp_md5sig_info *md5sig;
123 md5sig = rcu_dereference(tcp_sk(sk)->md5sig_info);
125 err = tcp_diag_put_md5sig(skb, md5sig);
133 const struct tcp_ulp_ops *ulp_ops;
135 ulp_ops = icsk->icsk_ulp_ops;
137 err = tcp_diag_put_ulp(skb, sk, ulp_ops);
144 static size_t tcp_diag_get_aux_size(struct sock *sk, bool net_admin)
146 struct inet_connection_sock *icsk = inet_csk(sk);
149 #ifdef CONFIG_TCP_MD5SIG
150 if (net_admin && sk_fullsock(sk)) {
151 const struct tcp_md5sig_info *md5sig;
152 const struct tcp_md5sig_key *key;
153 size_t md5sig_count = 0;
156 md5sig = rcu_dereference(tcp_sk(sk)->md5sig_info);
158 hlist_for_each_entry_rcu(key, &md5sig->head, node)
162 size += nla_total_size(md5sig_count *
163 sizeof(struct tcp_diag_md5sig));
167 if (net_admin && sk_fullsock(sk)) {
168 const struct tcp_ulp_ops *ulp_ops;
170 ulp_ops = icsk->icsk_ulp_ops;
172 size += nla_total_size(0) +
173 nla_total_size(TCP_ULP_NAME_MAX);
174 if (ulp_ops->get_info_size)
175 size += ulp_ops->get_info_size(sk);
181 static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
182 const struct inet_diag_req_v2 *r)
184 inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r);
187 static int tcp_diag_dump_one(struct netlink_callback *cb,
188 const struct inet_diag_req_v2 *req)
190 return inet_diag_dump_one_icsk(&tcp_hashinfo, cb, req);
193 #ifdef CONFIG_INET_DIAG_DESTROY
194 static int tcp_diag_destroy(struct sk_buff *in_skb,
195 const struct inet_diag_req_v2 *req)
197 struct net *net = sock_net(in_skb->sk);
198 struct sock *sk = inet_diag_find_one_icsk(net, &tcp_hashinfo, req);
204 err = sock_diag_destroy(sk, ECONNABORTED);
212 static const struct inet_diag_handler tcp_diag_handler = {
213 .dump = tcp_diag_dump,
214 .dump_one = tcp_diag_dump_one,
215 .idiag_get_info = tcp_diag_get_info,
216 .idiag_get_aux = tcp_diag_get_aux,
217 .idiag_get_aux_size = tcp_diag_get_aux_size,
218 .idiag_type = IPPROTO_TCP,
219 .idiag_info_size = sizeof(struct tcp_info),
220 #ifdef CONFIG_INET_DIAG_DESTROY
221 .destroy = tcp_diag_destroy,
225 static int __init tcp_diag_init(void)
227 return inet_diag_register(&tcp_diag_handler);
230 static void __exit tcp_diag_exit(void)
232 inet_diag_unregister(&tcp_diag_handler);
235 module_init(tcp_diag_init);
236 module_exit(tcp_diag_exit);
237 MODULE_LICENSE("GPL");
238 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */);