1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __SOCK_DIAG_H__
3#define __SOCK_DIAG_H__
4
5#include <linux/netlink.h>
6#include <linux/user_namespace.h>
7#include <net/net_namespace.h>
8#include <net/sock.h>
9#include <uapi/linux/sock_diag.h>
10
11struct sk_buff;
12struct nlmsghdr;
13struct sock;
14
15struct sock_diag_handler {
16	struct module *owner;
17	__u8 family;
18	int (*dump)(struct sk_buff *skb, struct nlmsghdr *nlh);
19	int (*get_info)(struct sk_buff *skb, struct sock *sk);
20	int (*destroy)(struct sk_buff *skb, struct nlmsghdr *nlh);
21};
22
23int sock_diag_register(const struct sock_diag_handler *h);
24void sock_diag_unregister(const struct sock_diag_handler *h);
25
26struct sock_diag_inet_compat {
27	struct module *owner;
28	int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh);
29};
30
31void sock_diag_register_inet_compat(const struct sock_diag_inet_compat *ptr);
32void sock_diag_unregister_inet_compat(const struct sock_diag_inet_compat *ptr);
33
34u64 __sock_gen_cookie(struct sock *sk);
35
36static inline u64 sock_gen_cookie(struct sock *sk)
37{
38	u64 cookie;
39
40	preempt_disable();
41	cookie = __sock_gen_cookie(sk);
42	preempt_enable();
43
44	return cookie;
45}
46
47int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie);
48void sock_diag_save_cookie(struct sock *sk, __u32 *cookie);
49
50int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attr);
51int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
52			     struct sk_buff *skb, int attrtype);
53
54static inline
55enum sknetlink_groups sock_diag_destroy_group(const struct sock *sk)
56{
57	switch (sk->sk_family) {
58	case AF_INET:
59		if (sk->sk_type == SOCK_RAW)
60			return SKNLGRP_NONE;
61
62		switch (sk->sk_protocol) {
63		case IPPROTO_TCP:
64			return SKNLGRP_INET_TCP_DESTROY;
65		case IPPROTO_UDP:
66			return SKNLGRP_INET_UDP_DESTROY;
67		default:
68			return SKNLGRP_NONE;
69		}
70	case AF_INET6:
71		if (sk->sk_type == SOCK_RAW)
72			return SKNLGRP_NONE;
73
74		switch (sk->sk_protocol) {
75		case IPPROTO_TCP:
76			return SKNLGRP_INET6_TCP_DESTROY;
77		case IPPROTO_UDP:
78			return SKNLGRP_INET6_UDP_DESTROY;
79		default:
80			return SKNLGRP_NONE;
81		}
82	default:
83		return SKNLGRP_NONE;
84	}
85}
86
87static inline
88bool sock_diag_has_destroy_listeners(const struct sock *sk)
89{
90	const struct net *n = sock_net(sk);
91	const enum sknetlink_groups group = sock_diag_destroy_group(sk);
92
93	return group != SKNLGRP_NONE && n->diag_nlsk &&
94		netlink_has_listeners(n->diag_nlsk, group);
95}
96void sock_diag_broadcast_destroy(struct sock *sk);
97
98int sock_diag_destroy(struct sock *sk, int err);
99#endif
100