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 #include <linux/phonet.h>
  14 #include <linux/skbuff.h>
  15 #include <net/sock.h>
  16
  17 /*
  18  * The lower layers may not require more space, ever. Make sure it's
  19  * enough.
  20  */
  21 #define MAX_PHONET_HEADER       (8 + MAX_HEADER)
  22
  23 /*
  24  * Every Phonet* socket has this structure first in its
  25  * protocol-specific structure under name c.
  26  */
  27 struct pn_sock {
  28         struct sock     sk;
  29         u16             sobject;
  30         u16             dobject;
  31         u8              resource;
  32 };
  33
  34 static inline struct pn_sock *pn_sk(struct sock *sk)
  35 {
  36         return (struct pn_sock *)sk;
  37 }
  38
  39 extern const struct proto_ops phonet_dgram_ops;
  40
  41 void pn_sock_init(void);
  42 struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *sa);
  43 void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb);
  44 void phonet_get_local_port_range(int *min, int *max);
  45 int pn_sock_hash(struct sock *sk);
  46 void pn_sock_unhash(struct sock *sk);
  47 int pn_sock_get_port(struct sock *sk, unsigned short sport);
  48
  49 struct sock *pn_find_sock_by_res(struct net *net, u8 res);
  50 int pn_sock_bind_res(struct sock *sock, u8 res);
  51 int pn_sock_unbind_res(struct sock *sk, u8 res);
  52 void pn_sock_unbind_all_res(struct sock *sk);
  53
  54 int pn_skb_send(struct sock *sk, struct sk_buff *skb,
  55                 const struct sockaddr_pn *target);
  56
  57 static inline struct phonethdr *pn_hdr(struct sk_buff *skb)
  58 {
  59         return (struct phonethdr *)skb_network_header(skb);
  60 }
  61
  62 static inline struct phonetmsg *pn_msg(struct sk_buff *skb)
  63 {
  64         return (struct phonetmsg *)skb_transport_header(skb);
  65 }
  66
  67 /*
  68  * Get the other party's sockaddr from received skb. The skb begins
  69  * with a Phonet header.
  70  */
  71 static inline
  72 void pn_skb_get_src_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
  73 {
  74         struct phonethdr *ph = pn_hdr(skb);
  75         u16 obj = pn_object(ph->pn_sdev, ph->pn_sobj);
  76
  77         sa->spn_family = AF_PHONET;
  78         pn_sockaddr_set_object(sa, obj);
  79         pn_sockaddr_set_resource(sa, ph->pn_res);
  80         memset(sa->spn_zero, 0, sizeof(sa->spn_zero));
  81 }
  82
  83 static inline
  84 void pn_skb_get_dst_sockaddr(struct sk_buff *skb, struct sockaddr_pn *sa)
  85 {
  86         struct phonethdr *ph = pn_hdr(skb);
  87         u16 obj = pn_object(ph->pn_rdev, ph->pn_robj);
  88
  89         sa->spn_family = AF_PHONET;
  90         pn_sockaddr_set_object(sa, obj);
  91         pn_sockaddr_set_resource(sa, ph->pn_res);
  92         memset(sa->spn_zero, 0, sizeof(sa->spn_zero));
  93 }
  94
  95 /* Protocols in Phonet protocol family. */
  96 struct phonet_protocol {
  97         const struct proto_ops  *ops;
  98         struct proto            *prot;
  99         int                     sock_type;
 100 };
 101
 102 int phonet_proto_register(unsigned int protocol,
 103                 const struct phonet_protocol *pp);
 104 void phonet_proto_unregister(unsigned int protocol,
 105                 const struct phonet_protocol *pp);
 106
 107 int phonet_sysctl_init(void);
 108 void phonet_sysctl_exit(void);
 109 int isi_register(void);
 110 void isi_unregister(void);
 111
 112 static inline bool sk_is_phonet(struct sock *sk)
 113 {
 114         return sk->sk_family == PF_PHONET;
 115 }
 116
 117 static inline int phonet_sk_ioctl(struct sock *sk, unsigned int cmd,
 118                                   void __user *arg)
 119 {
 120         int karg;
 121
 122         switch (cmd) {
 123         case SIOCPNADDRESOURCE:
 124         case SIOCPNDELRESOURCE:
 125                 if (get_user(karg, (int __user *)arg))
 126                         return -EFAULT;
 127
 128                 return sk->sk_prot->ioctl(sk, cmd, &karg);
 129         }
 130         /* A positive return value means that the ioctl was not processed */
 131         return 1;
 132 }
 133 #endif