include/linux/if_pppox.h

   1 /***************************************************************************
   2  * Linux PPP over X - Generic PPP transport layer sockets
   3  * Linux PPP over Ethernet (PPPoE) Socket Implementation (RFC 2516)
   4  *
   5  * This file supplies definitions required by the PPP over Ethernet driver
   6  * (pppox.c).  All version information wrt this file is located in pppox.c
   7  *
   8  * License:
   9  *              This program is free software; you can redistribute it and/or
  10  *              modify it under the terms of the GNU General Public License
  11  *              as published by the Free Software Foundation; either version
  12  *              2 of the License, or (at your option) any later version.
  13  *
  14  */
  15
  16 #ifndef __LINUX_IF_PPPOX_H
  17 #define __LINUX_IF_PPPOX_H
  18
  19
  20 #include <asm/types.h>
  21 #include <asm/byteorder.h>
  22
  23 #ifdef  __KERNEL__
  24 #include <linux/if_ether.h>
  25 #include <linux/if.h>
  26 #include <linux/netdevice.h>
  27 #include <asm/semaphore.h>
  28 #include <linux/ppp_channel.h>
  29 #endif /* __KERNEL__ */
  30
  31 /* For user-space programs to pick up these definitions
  32  * which they wouldn't get otherwise without defining __KERNEL__
  33  */
  34 #ifndef AF_PPPOX
  35 #define AF_PPPOX        24
  36 #define PF_PPPOX        AF_PPPOX
  37 #endif /* !(AF_PPPOX) */
  38
  39 /************************************************************************
  40  * PPPoE addressing definition
  41  */
  42 typedef __u16 sid_t;
  43 struct pppoe_addr{
  44        sid_t           sid;                    /* Session identifier */
  45        unsigned char   remote[ETH_ALEN];       /* Remote address */
  46        char            dev[IFNAMSIZ];          /* Local device to use */
  47 };
  48
  49 /************************************************************************
  50  * Protocols supported by AF_PPPOX
  51  */
  52 #define PX_PROTO_OE    0 /* Currently just PPPoE */
  53 #define PX_MAX_PROTO   1
  54
  55 struct sockaddr_pppox {
  56        sa_family_t     sa_family;            /* address family, AF_PPPOX */
  57        unsigned int    sa_protocol;          /* protocol identifier */
  58        union{
  59                struct pppoe_addr       pppoe;
  60        }sa_addr;
  61 }__attribute__ ((packed));
  62
  63
  64 /*********************************************************************
  65  *
  66  * ioctl interface for defining forwarding of connections
  67  *
  68  ********************************************************************/
  69
  70 #define PPPOEIOCSFWD    _IOW(0xB1 ,0, size_t)
  71 #define PPPOEIOCDFWD    _IO(0xB1 ,1)
  72 /*#define PPPOEIOCGFWD  _IOWR(0xB1,2, size_t)*/
  73
  74 /* Codes to identify message types */
  75 #define PADI_CODE       0x09
  76 #define PADO_CODE       0x07
  77 #define PADR_CODE       0x19
  78 #define PADS_CODE       0x65
  79 #define PADT_CODE       0xa7
  80 struct pppoe_tag {
  81         __u16 tag_type;
  82         __u16 tag_len;
  83         char tag_data[0];
  84 } __attribute ((packed));
  85
  86 /* Tag identifiers */
  87 #define PTT_EOL         __constant_htons(0x0000)
  88 #define PTT_SRV_NAME    __constant_htons(0x0101)
  89 #define PTT_AC_NAME     __constant_htons(0x0102)
  90 #define PTT_HOST_UNIQ   __constant_htons(0x0103)
  91 #define PTT_AC_COOKIE   __constant_htons(0x0104)
  92 #define PTT_VENDOR      __constant_htons(0x0105)
  93 #define PTT_RELAY_SID   __constant_htons(0x0110)
  94 #define PTT_SRV_ERR     __constant_htons(0x0201)
  95 #define PTT_SYS_ERR     __constant_htons(0x0202)
  96 #define PTT_GEN_ERR     __constant_htons(0x0203)
  97
  98 struct pppoe_hdr {
  99 #if defined(__LITTLE_ENDIAN_BITFIELD)
 100         __u8 ver : 4;
 101         __u8 type : 4;
 102 #elif defined(__BIG_ENDIAN_BITFIELD)
 103         __u8 type : 4;
 104         __u8 ver : 4;
 105 #else
 106 #error  "Please fix <asm/byteorder.h>"
 107 #endif
 108         __u8 code;
 109         __u16 sid;
 110         __u16 length;
 111         struct pppoe_tag tag[0];
 112 } __attribute__ ((packed));
 113
 114 #ifdef __KERNEL__
 115 #include <linux/skbuff.h>
 116
 117 static inline struct pppoe_hdr *pppoe_hdr(const struct sk_buff *skb)
 118 {
 119         return (struct pppoe_hdr *)skb_network_header(skb);
 120 }
 121
 122 struct pppoe_opt {
 123         struct net_device      *dev;      /* device associated with socket*/
 124         int                     ifindex;  /* ifindex of device associated with socket */
 125         struct pppoe_addr       pa;       /* what this socket is bound to*/
 126         struct sockaddr_pppox   relay;    /* what socket data will be
 127                                              relayed to (PPPoE relaying) */
 128 };
 129
 130 #include <net/sock.h>
 131
 132 struct pppox_sock {
 133         /* struct sock must be the first member of pppox_sock */
 134         struct sock             sk;
 135         struct ppp_channel      chan;
 136         struct pppox_sock       *next;    /* for hash table */
 137         union {
 138                 struct pppoe_opt pppoe;
 139         } proto;
 140         unsigned short          num;
 141 };
 142 #define pppoe_dev       proto.pppoe.dev
 143 #define pppoe_ifindex   proto.pppoe.ifindex
 144 #define pppoe_pa        proto.pppoe.pa
 145 #define pppoe_relay     proto.pppoe.relay
 146
 147 static inline struct pppox_sock *pppox_sk(struct sock *sk)
 148 {
 149         return (struct pppox_sock *)sk;
 150 }
 151
 152 static inline struct sock *sk_pppox(struct pppox_sock *po)
 153 {
 154         return (struct sock *)po;
 155 }
 156
 157 struct module;
 158
 159 struct pppox_proto {
 160         int             (*create)(struct socket *sock);
 161         int             (*ioctl)(struct socket *sock, unsigned int cmd,
 162                                  unsigned long arg);
 163         struct module   *owner;
 164 };
 165
 166 extern int register_pppox_proto(int proto_num, struct pppox_proto *pp);
 167 extern void unregister_pppox_proto(int proto_num);
 168 extern void pppox_unbind_sock(struct sock *sk);/* delete ppp-channel binding */
 169 extern int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
 170
 171 /* PPPoX socket states */
 172 enum {
 173     PPPOX_NONE          = 0,  /* initial state */
 174     PPPOX_CONNECTED     = 1,  /* connection established ==TCP_ESTABLISHED */
 175     PPPOX_BOUND         = 2,  /* bound to ppp device */
 176     PPPOX_RELAY         = 4,  /* forwarding is enabled */
 177     PPPOX_ZOMBIE        = 8,  /* dead, but still bound to ppp device */
 178     PPPOX_DEAD          = 16  /* dead, useless, please clean me up!*/
 179 };
 180
 181 #endif /* __KERNEL__ */
 182
 183 #endif /* !(__LINUX_IF_PPPOX_H) */