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(ph->pn_sdev, ph->pn_sobj);
76
77	sa->spn_family = AF_PHONET;
78	pn_sockaddr_set_object(sa, obj);
79	pn_sockaddr_set_resource(sa, ph->pn_res);
80	memset(sa->spn_zero, 0, 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(ph->pn_rdev, ph->pn_robj);
88
89	sa->spn_family = AF_PHONET;
90	pn_sockaddr_set_object(sa, obj);
91	pn_sockaddr_set_resource(sa, ph->pn_res);
92	memset(sa->spn_zero, 0, 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