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