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 <linux/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 <linux/ppp_channel.h>
  28 #endif /* __KERNEL__ */
  29 #include <linux/if_pppol2tp.h>
  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 __be16 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_PROTO_OL2TP 1 /* Now L2TP also */
  54 #define PX_MAX_PROTO   2
  55
  56 struct sockaddr_pppox {
  57        sa_family_t     sa_family;            /* address family, AF_PPPOX */
  58        unsigned int    sa_protocol;          /* protocol identifier */
  59        union{
  60                struct pppoe_addr       pppoe;
  61        }sa_addr;
  62 } __attribute__((packed));
  63
  64 /* The use of the above union isn't viable because the size of this
  65  * struct must stay fixed over time -- applications use sizeof(struct
  66  * sockaddr_pppox) to fill it. We use a protocol specific sockaddr
  67  * type instead.
  68  */
  69 struct sockaddr_pppol2tp {
  70         sa_family_t     sa_family;      /* address family, AF_PPPOX */
  71         unsigned int    sa_protocol;    /* protocol identifier */
  72         struct pppol2tp_addr pppol2tp;
  73 } __attribute__((packed));
  74
  75 /* The L2TPv3 protocol changes tunnel and session ids from 16 to 32
  76  * bits. So we need a different sockaddr structure.
  77  */
  78 struct sockaddr_pppol2tpv3 {
  79         sa_family_t     sa_family;      /* address family, AF_PPPOX */
  80         unsigned int    sa_protocol;    /* protocol identifier */
  81         struct pppol2tpv3_addr pppol2tp;
  82 } __attribute__((packed));
  83
  84 /*********************************************************************
  85  *
  86  * ioctl interface for defining forwarding of connections
  87  *
  88  ********************************************************************/
  89
  90 #define PPPOEIOCSFWD    _IOW(0xB1 ,0, size_t)
  91 #define PPPOEIOCDFWD    _IO(0xB1 ,1)
  92 /*#define PPPOEIOCGFWD  _IOWR(0xB1,2, size_t)*/
  93
  94 /* Codes to identify message types */
  95 #define PADI_CODE       0x09
  96 #define PADO_CODE       0x07
  97 #define PADR_CODE       0x19
  98 #define PADS_CODE       0x65
  99 #define PADT_CODE       0xa7
 100 struct pppoe_tag {
 101         __be16 tag_type;
 102         __be16 tag_len;
 103         char tag_data[0];
 104 } __attribute__ ((packed));
 105
 106 /* Tag identifiers */
 107 #define PTT_EOL         __cpu_to_be16(0x0000)
 108 #define PTT_SRV_NAME    __cpu_to_be16(0x0101)
 109 #define PTT_AC_NAME     __cpu_to_be16(0x0102)
 110 #define PTT_HOST_UNIQ   __cpu_to_be16(0x0103)
 111 #define PTT_AC_COOKIE   __cpu_to_be16(0x0104)
 112 #define PTT_VENDOR      __cpu_to_be16(0x0105)
 113 #define PTT_RELAY_SID   __cpu_to_be16(0x0110)
 114 #define PTT_SRV_ERR     __cpu_to_be16(0x0201)
 115 #define PTT_SYS_ERR     __cpu_to_be16(0x0202)
 116 #define PTT_GEN_ERR     __cpu_to_be16(0x0203)
 117
 118 struct pppoe_hdr {
 119 #if defined(__LITTLE_ENDIAN_BITFIELD)
 120         __u8 ver : 4;
 121         __u8 type : 4;
 122 #elif defined(__BIG_ENDIAN_BITFIELD)
 123         __u8 type : 4;
 124         __u8 ver : 4;
 125 #else
 126 #error  "Please fix <asm/byteorder.h>"
 127 #endif
 128         __u8 code;
 129         __be16 sid;
 130         __be16 length;
 131         struct pppoe_tag tag[0];
 132 } __attribute__((packed));
 133
 134 /* Length of entire PPPoE + PPP header */
 135 #define PPPOE_SES_HLEN  8
 136
 137 #ifdef __KERNEL__
 138 #include <linux/skbuff.h>
 139
 140 static inline struct pppoe_hdr *pppoe_hdr(const struct sk_buff *skb)
 141 {
 142         return (struct pppoe_hdr *)skb_network_header(skb);
 143 }
 144
 145 struct pppoe_opt {
 146         struct net_device      *dev;      /* device associated with socket*/
 147         int                     ifindex;  /* ifindex of device associated with socket */
 148         struct pppoe_addr       pa;       /* what this socket is bound to*/
 149         struct sockaddr_pppox   relay;    /* what socket data will be
 150                                              relayed to (PPPoE relaying) */
 151 };
 152
 153 #include <net/sock.h>
 154
 155 struct pppox_sock {
 156         /* struct sock must be the first member of pppox_sock */
 157         struct sock             sk;
 158         struct ppp_channel      chan;
 159         struct pppox_sock       *next;    /* for hash table */
 160         union {
 161                 struct pppoe_opt pppoe;
 162         } proto;
 163         __be16                  num;
 164 };
 165 #define pppoe_dev       proto.pppoe.dev
 166 #define pppoe_ifindex   proto.pppoe.ifindex
 167 #define pppoe_pa        proto.pppoe.pa
 168 #define pppoe_relay     proto.pppoe.relay
 169
 170 static inline struct pppox_sock *pppox_sk(struct sock *sk)
 171 {
 172         return (struct pppox_sock *)sk;
 173 }
 174
 175 static inline struct sock *sk_pppox(struct pppox_sock *po)
 176 {
 177         return (struct sock *)po;
 178 }
 179
 180 struct module;
 181
 182 struct pppox_proto {
 183         int             (*create)(struct net *net, struct socket *sock);
 184         int             (*ioctl)(struct socket *sock, unsigned int cmd,
 185                                  unsigned long arg);
 186         struct module   *owner;
 187 };
 188
 189 extern int register_pppox_proto(int proto_num, struct pppox_proto *pp);
 190 extern void unregister_pppox_proto(int proto_num);
 191 extern void pppox_unbind_sock(struct sock *sk);/* delete ppp-channel binding */
 192 extern int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
 193
 194 /* PPPoX socket states */
 195 enum {
 196     PPPOX_NONE          = 0,  /* initial state */
 197     PPPOX_CONNECTED     = 1,  /* connection established ==TCP_ESTABLISHED */
 198     PPPOX_BOUND         = 2,  /* bound to ppp device */
 199     PPPOX_RELAY         = 4,  /* forwarding is enabled */
 200     PPPOX_ZOMBIE        = 8,  /* dead, but still bound to ppp device */
 201     PPPOX_DEAD          = 16  /* dead, useless, please clean me up!*/
 202 };
 203
 204 #endif /* __KERNEL__ */
 205
 206 #endif /* !(__LINUX_IF_PPPOX_H) */