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 int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie);
30 void sock_diag_save_cookie(struct sock *sk, __u32 *cookie);
31
32 int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attr);
33 int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
34 struct sk_buff *skb, int attrtype);
35
36 static inline
sock_diag_destroy_group(const struct sock * sk)37 enum sknetlink_groups sock_diag_destroy_group(const struct sock *sk)
38 {
39 switch (sk->sk_family) {
40 case AF_INET:
41 if (sk->sk_type == SOCK_RAW)
42 return SKNLGRP_NONE;
43
44 switch (sk->sk_protocol) {
45 case IPPROTO_TCP:
46 return SKNLGRP_INET_TCP_DESTROY;
47 case IPPROTO_UDP:
48 return SKNLGRP_INET_UDP_DESTROY;
49 default:
50 return SKNLGRP_NONE;
51 }
52 case AF_INET6:
53 if (sk->sk_type == SOCK_RAW)
54 return SKNLGRP_NONE;
55
56 switch (sk->sk_protocol) {
57 case IPPROTO_TCP:
58 return SKNLGRP_INET6_TCP_DESTROY;
59 case IPPROTO_UDP:
60 return SKNLGRP_INET6_UDP_DESTROY;
61 default:
62 return SKNLGRP_NONE;
63 }
64 default:
65 return SKNLGRP_NONE;
66 }
67 }
68
69 static inline
sock_diag_has_destroy_listeners(const struct sock * sk)70 bool sock_diag_has_destroy_listeners(const struct sock *sk)
71 {
72 const struct net *n = sock_net(sk);
73 const enum sknetlink_groups group = sock_diag_destroy_group(sk);
74
75 return group != SKNLGRP_NONE && n->diag_nlsk &&
76 netlink_has_listeners(n->diag_nlsk, group);
77 }
78 void sock_diag_broadcast_destroy(struct sock *sk);
79
80 int sock_diag_destroy(struct sock *sk, int err);
81 #endif
82