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  */
27 struct pn_sock {
28 	struct sock	sk;
29 	u16		sobject;
30 	u16		dobject;
31 	u8		resource;
32 };
33 
pn_sk(struct sock * sk)34 static inline struct pn_sock *pn_sk(struct sock *sk)
35 {
36 	return (struct pn_sock *)sk;
37 }
38 
39 extern const struct proto_ops phonet_dgram_ops;
40 
41 void pn_sock_init(void);
42 struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *sa);
43 void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb);
44 void phonet_get_local_port_range(int *min, int *max);
45 int pn_sock_hash(struct sock *sk);
46 void pn_sock_unhash(struct sock *sk);
47 int pn_sock_get_port(struct sock *sk, unsigned short sport);
48 
49 struct sock *pn_find_sock_by_res(struct net *net, u8 res);
50 int pn_sock_bind_res(struct sock *sock, u8 res);
51 int pn_sock_unbind_res(struct sock *sk, u8 res);
52 void pn_sock_unbind_all_res(struct sock *sk);
53 
54 int pn_skb_send(struct sock *sk, struct sk_buff *skb,
55 		const struct sockaddr_pn *target);
56 
pn_hdr(struct sk_buff * skb)57 static inline struct phonethdr *pn_hdr(struct sk_buff *skb)
58 {
59 	return (struct phonethdr *)skb_network_header(skb);
60 }
61 
pn_msg(struct sk_buff * skb)62 static 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  */
71 static inline
pn_skb_get_src_sockaddr(struct sk_buff * skb,struct sockaddr_pn * sa)72 void 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 
83 static inline
pn_skb_get_dst_sockaddr(struct sk_buff * skb,struct sockaddr_pn * sa)84 void 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. */
96 struct phonet_protocol {
97 	const struct proto_ops	*ops;
98 	struct proto		*prot;
99 	int			sock_type;
100 };
101 
102 int phonet_proto_register(unsigned int protocol,
103 		const struct phonet_protocol *pp);
104 void phonet_proto_unregister(unsigned int protocol,
105 		const struct phonet_protocol *pp);
106 
107 int phonet_sysctl_init(void);
108 void phonet_sysctl_exit(void);
109 int isi_register(void);
110 void isi_unregister(void);
111 
112 #endif
113