include/net/phonet/phonet.h

   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(struct net *net, 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 int isi_register(void);
 109 void isi_unregister(void);
 110
 111 #endif