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