xref: /openbmc/linux/include/net/phonet/phonet.h (revision 9ac8d3fb)
1 /*
2  * File: af_phonet.h
3  *
4  * Phonet sockets kernel definitions
5  *
6  * Copyright (C) 2008 Nokia Corporation.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License
10  * version 2 as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20  * 02110-1301 USA
21  */
22 
23 #ifndef AF_PHONET_H
24 #define AF_PHONET_H
25 
26 /*
27  * The lower layers may not require more space, ever. Make sure it's
28  * enough.
29  */
30 #define MAX_PHONET_HEADER	(8 + MAX_HEADER)
31 
32 /*
33  * Every Phonet* socket has this structure first in its
34  * protocol-specific structure under name c.
35  */
36 struct pn_sock {
37 	struct sock	sk;
38 	u16		sobject;
39 	u8		resource;
40 };
41 
42 static inline struct pn_sock *pn_sk(struct sock *sk)
43 {
44 	return (struct pn_sock *)sk;
45 }
46 
47 extern const struct proto_ops phonet_dgram_ops;
48 
49 struct sock *pn_find_sock_by_sa(const struct sockaddr_pn *sa);
50 void phonet_get_local_port_range(int *min, int *max);
51 void pn_sock_hash(struct sock *sk);
52 void pn_sock_unhash(struct sock *sk);
53 int pn_sock_get_port(struct sock *sk, unsigned short sport);
54 
55 int pn_skb_send(struct sock *sk, struct sk_buff *skb,
56 		const struct sockaddr_pn *target);
57 
58 static inline struct phonethdr *pn_hdr(struct sk_buff *skb)
59 {
60 	return (struct phonethdr *)skb_network_header(skb);
61 }
62 
63 static inline struct phonetmsg *pn_msg(struct sk_buff *skb)
64 {
65 	return (struct phonetmsg *)skb_transport_header(skb);
66 }
67 
68 /*
69  * Get the other party's sockaddr from received skb. The skb begins
70  * with a Phonet header.
71  */
72 static inline
73 void pn_skb_get_src_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
74 {
75 	struct phonethdr *ph = pn_hdr(skb);
76 	u16 obj = pn_object(ph->pn_sdev, ph->pn_sobj);
77 
78 	sa->spn_family = AF_PHONET;
79 	pn_sockaddr_set_object(sa, obj);
80 	pn_sockaddr_set_resource(sa, ph->pn_res);
81 	memset(sa->spn_zero, 0, sizeof(sa->spn_zero));
82 }
83 
84 static inline
85 void pn_skb_get_dst_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
86 {
87 	struct phonethdr *ph = pn_hdr(skb);
88 	u16 obj = pn_object(ph->pn_rdev, ph->pn_robj);
89 
90 	sa->spn_family = AF_PHONET;
91 	pn_sockaddr_set_object(sa, obj);
92 	pn_sockaddr_set_resource(sa, ph->pn_res);
93 	memset(sa->spn_zero, 0, sizeof(sa->spn_zero));
94 }
95 
96 /* Protocols in Phonet protocol family. */
97 struct phonet_protocol {
98 	const struct proto_ops	*ops;
99 	struct proto		*prot;
100 	int			sock_type;
101 };
102 
103 int phonet_proto_register(int protocol, struct phonet_protocol *pp);
104 void phonet_proto_unregister(int protocol, struct phonet_protocol *pp);
105 
106 int phonet_sysctl_init(void);
107 void phonet_sysctl_exit(void);
108 void phonet_netlink_register(void);
109 int isi_register(void);
110 void isi_unregister(void);
111 
112 #endif
113