1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * File: af_phonet.h
4 *
5 * Phonet sockets kernel definitions
6 *
7 * Copyright (C) 2008 Nokia Corporation.
8 */
9
10#ifndef AF_PHONET_H
11#define AF_PHONET_H
12
13#include <linux/phonet.h>
14#include <linux/skbuff.h>
15#include <net/sock.h>
16
17/*
18 * The lower layers may not require more space, ever. Make sure it's
19 * enough.
20 */
21#define MAX_PHONET_HEADER (8 + MAX_HEADER)
22
23/*
24 * Every Phonet* socket has this structure first in its
25 * protocol-specific structure under name c.
26 */
27struct pn_sock {
28 struct sock sk;
29 u16 sobject;
30 u16 dobject;
31 u8 resource;
32};
33
34static inline struct pn_sock *pn_sk(struct sock *sk)
35{
36 return (struct pn_sock *)sk;
37}
38
39extern const struct proto_ops phonet_dgram_ops;
40
41void pn_sock_init(void);
42struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *sa);
43void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb);
44void phonet_get_local_port_range(int *min, int *max);
45int pn_sock_hash(struct sock *sk);
46void pn_sock_unhash(struct sock *sk);
47int pn_sock_get_port(struct sock *sk, unsigned short sport);
48
49struct sock *pn_find_sock_by_res(struct net *net, u8 res);
50int pn_sock_bind_res(struct sock *sock, u8 res);
51int pn_sock_unbind_res(struct sock *sk, u8 res);
52void pn_sock_unbind_all_res(struct sock *sk);
53
54int pn_skb_send(struct sock *sk, struct sk_buff *skb,
55 const struct sockaddr_pn *target);
56
57static inline struct phonethdr *pn_hdr(struct sk_buff *skb)
58{
59 return (struct phonethdr *)skb_network_header(skb);
60}
61
62static inline struct phonetmsg *pn_msg(struct sk_buff *skb)
63{
64 return (struct phonetmsg *)skb_transport_header(skb);
65}
66
67/*
68 * Get the other party's sockaddr from received skb. The skb begins
69 * with a Phonet header.
70 */
71static inline
72void pn_skb_get_src_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
73{
74 struct phonethdr *ph = pn_hdr(skb);
75 u16 obj = pn_object(addr: ph->pn_sdev, port: ph->pn_sobj);
76
77 sa->spn_family = AF_PHONET;
78 pn_sockaddr_set_object(spn: sa, handle: obj);
79 pn_sockaddr_set_resource(spn: sa, resource: ph->pn_res);
80 memset(s: sa->spn_zero, c: 0, n: sizeof(sa->spn_zero));
81}
82
83static inline
84void pn_skb_get_dst_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
85{
86 struct phonethdr *ph = pn_hdr(skb);
87 u16 obj = pn_object(addr: ph->pn_rdev, port: ph->pn_robj);
88
89 sa->spn_family = AF_PHONET;
90 pn_sockaddr_set_object(spn: sa, handle: obj);
91 pn_sockaddr_set_resource(spn: sa, resource: ph->pn_res);
92 memset(s: sa->spn_zero, c: 0, n: sizeof(sa->spn_zero));
93}
94
95/* Protocols in Phonet protocol family. */
96struct phonet_protocol {
97 const struct proto_ops *ops;
98 struct proto *prot;
99 int sock_type;
100};
101
102int phonet_proto_register(unsigned int protocol,
103 const struct phonet_protocol *pp);
104void phonet_proto_unregister(unsigned int protocol,
105 const struct phonet_protocol *pp);
106
107int phonet_sysctl_init(void);
108void phonet_sysctl_exit(void);
109int isi_register(void);
110void isi_unregister(void);
111
112static inline bool sk_is_phonet(struct sock *sk)
113{
114 return sk->sk_family == PF_PHONET;
115}
116
117static inline int phonet_sk_ioctl(struct sock *sk, unsigned int cmd,
118 void __user *arg)
119{
120 int karg;
121
122 switch (cmd) {
123 case SIOCPNADDRESOURCE:
124 case SIOCPNDELRESOURCE:
125 if (get_user(karg, (int __user *)arg))
126 return -EFAULT;
127
128 return sk->sk_prot->ioctl(sk, cmd, &karg);
129 }
130 /* A positive return value means that the ioctl was not processed */
131 return 1;
132}
133#endif
134