include/net/phonet/phonet.h

   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 /*
  14  * The lower layers may not require more space, ever. Make sure it's
  15  * enough.
  16  */
  17 #define MAX_PHONET_HEADER       (8 + MAX_HEADER)
  18
  19 /*
  20  * Every Phonet* socket has this structure first in its
  21  * protocol-specific structure under name c.
  22  */
  23 struct pn_sock {
  24         struct sock     sk;
  25         u16             sobject;
  26         u16             dobject;
  27         u8              resource;
  28 };
  29
  30 static inline struct pn_sock *pn_sk(struct sock *sk)
  31 {
  32         return (struct pn_sock *)sk;
  33 }
  34
  35 extern const struct proto_ops phonet_dgram_ops;
  36
  37 void pn_sock_init(void);
  38 struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *sa);
  39 void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb);
  40 void phonet_get_local_port_range(int *min, int *max);
  41 int pn_sock_hash(struct sock *sk);
  42 void pn_sock_unhash(struct sock *sk);
  43 int pn_sock_get_port(struct sock *sk, unsigned short sport);
  44
  45 struct sock *pn_find_sock_by_res(struct net *net, u8 res);
  46 int pn_sock_bind_res(struct sock *sock, u8 res);
  47 int pn_sock_unbind_res(struct sock *sk, u8 res);
  48 void pn_sock_unbind_all_res(struct sock *sk);
  49
  50 int pn_skb_send(struct sock *sk, struct sk_buff *skb,
  51                 const struct sockaddr_pn *target);
  52
  53 static inline struct phonethdr *pn_hdr(struct sk_buff *skb)
  54 {
  55         return (struct phonethdr *)skb_network_header(skb);
  56 }
  57
  58 static inline struct phonetmsg *pn_msg(struct sk_buff *skb)
  59 {
  60         return (struct phonetmsg *)skb_transport_header(skb);
  61 }
  62
  63 /*
  64  * Get the other party's sockaddr from received skb. The skb begins
  65  * with a Phonet header.
  66  */
  67 static inline
  68 void pn_skb_get_src_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
  69 {
  70         struct phonethdr *ph = pn_hdr(skb);
  71         u16 obj = pn_object(ph->pn_sdev, ph->pn_sobj);
  72
  73         sa->spn_family = AF_PHONET;
  74         pn_sockaddr_set_object(sa, obj);
  75         pn_sockaddr_set_resource(sa, ph->pn_res);
  76         memset(sa->spn_zero, 0, sizeof(sa->spn_zero));
  77 }
  78
  79 static inline
  80 void pn_skb_get_dst_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
  81 {
  82         struct phonethdr *ph = pn_hdr(skb);
  83         u16 obj = pn_object(ph->pn_rdev, ph->pn_robj);
  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 /* Protocols in Phonet protocol family. */
  92 struct phonet_protocol {
  93         const struct proto_ops  *ops;
  94         struct proto            *prot;
  95         int                     sock_type;
  96 };
  97
  98 int phonet_proto_register(unsigned int protocol,
  99                 const struct phonet_protocol *pp);
 100 void phonet_proto_unregister(unsigned int protocol,
 101                 const struct phonet_protocol *pp);
 102
 103 int phonet_sysctl_init(void);
 104 void phonet_sysctl_exit(void);
 105 int isi_register(void);
 106 void isi_unregister(void);
 107
 108 #endif