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phonet.h
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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  u16 dobject;
40  u8 resource;
41 };
42 
43 static inline struct pn_sock *pn_sk(struct sock *sk)
44 {
45  return (struct pn_sock *)sk;
46 }
47 
48 extern const struct proto_ops phonet_dgram_ops;
49 
50 void pn_sock_init(void);
51 struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *sa);
52 void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb);
53 void phonet_get_local_port_range(int *min, int *max);
54 void pn_sock_hash(struct sock *sk);
55 void pn_sock_unhash(struct sock *sk);
56 int pn_sock_get_port(struct sock *sk, unsigned short sport);
57 
58 struct sock *pn_find_sock_by_res(struct net *net, u8 res);
59 int pn_sock_bind_res(struct sock *sock, u8 res);
60 int pn_sock_unbind_res(struct sock *sk, u8 res);
61 void pn_sock_unbind_all_res(struct sock *sk);
62 
63 int pn_skb_send(struct sock *sk, struct sk_buff *skb,
64  const struct sockaddr_pn *target);
65 
66 static inline struct phonethdr *pn_hdr(struct sk_buff *skb)
67 {
68  return (struct phonethdr *)skb_network_header(skb);
69 }
70 
71 static inline struct phonetmsg *pn_msg(struct sk_buff *skb)
72 {
73  return (struct phonetmsg *)skb_transport_header(skb);
74 }
75 
76 /*
77  * Get the other party's sockaddr from received skb. The skb begins
78  * with a Phonet header.
79  */
80 static inline
81 void pn_skb_get_src_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
82 {
83  struct phonethdr *ph = pn_hdr(skb);
84  u16 obj = pn_object(ph->pn_sdev, ph->pn_sobj);
85 
86  sa->spn_family = AF_PHONET;
87  pn_sockaddr_set_object(sa, obj);
88  pn_sockaddr_set_resource(sa, ph->pn_res);
89  memset(sa->spn_zero, 0, sizeof(sa->spn_zero));
90 }
91 
92 static inline
93 void pn_skb_get_dst_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
94 {
95  struct phonethdr *ph = pn_hdr(skb);
96  u16 obj = pn_object(ph->pn_rdev, ph->pn_robj);
97 
98  sa->spn_family = AF_PHONET;
99  pn_sockaddr_set_object(sa, obj);
100  pn_sockaddr_set_resource(sa, ph->pn_res);
101  memset(sa->spn_zero, 0, sizeof(sa->spn_zero));
102 }
103 
104 /* Protocols in Phonet protocol family. */
105 struct phonet_protocol {
106  const struct proto_ops *ops;
107  struct proto *prot;
108  int sock_type;
109 };
110 
111 int phonet_proto_register(unsigned int protocol, struct phonet_protocol *pp);
112 void phonet_proto_unregister(unsigned int protocol, struct phonet_protocol *pp);
113 
114 int phonet_sysctl_init(void);
115 void phonet_sysctl_exit(void);
116 int isi_register(void);
117 void isi_unregister(void);
118 
119 #endif
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