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  * PPTP addressing definition
  51  */
  52 struct pptp_addr {
  53         __be16          call_id;
  54         struct in_addr  sin_addr;
  55 };
  56
  57 /************************************************************************
  58  * Protocols supported by AF_PPPOX
  59  */
  60 #define PX_PROTO_OE    0 /* Currently just PPPoE */
  61 #define PX_PROTO_OL2TP 1 /* Now L2TP also */
  62 #define PX_PROTO_PPTP  2
  63 #define PX_MAX_PROTO   3
  64
  65 struct sockaddr_pppox {
  66         sa_family_t     sa_family;            /* address family, AF_PPPOX */
  67         unsigned int    sa_protocol;          /* protocol identifier */
  68         union {
  69                 struct pppoe_addr  pppoe;
  70                 struct pptp_addr   pptp;
  71         } sa_addr;
  72 } __attribute__((packed));
  73
  74 /* The use of the above union isn't viable because the size of this
  75  * struct must stay fixed over time -- applications use sizeof(struct
  76  * sockaddr_pppox) to fill it. We use a protocol specific sockaddr
  77  * type instead.
  78  */
  79 struct sockaddr_pppol2tp {
  80         sa_family_t     sa_family;      /* address family, AF_PPPOX */
  81         unsigned int    sa_protocol;    /* protocol identifier */
  82         struct pppol2tp_addr pppol2tp;
  83 } __attribute__((packed));
  84
  85 /* The L2TPv3 protocol changes tunnel and session ids from 16 to 32
  86  * bits. So we need a different sockaddr structure.
  87  */
  88 struct sockaddr_pppol2tpv3 {
  89         sa_family_t     sa_family;      /* address family, AF_PPPOX */
  90         unsigned int    sa_protocol;    /* protocol identifier */
  91         struct pppol2tpv3_addr pppol2tp;
  92 } __attribute__((packed));
  93
  94 /*********************************************************************
  95  *
  96  * ioctl interface for defining forwarding of connections
  97  *
  98  ********************************************************************/
  99
 100 #define PPPOEIOCSFWD    _IOW(0xB1 ,0, size_t)
 101 #define PPPOEIOCDFWD    _IO(0xB1 ,1)
 102 /*#define PPPOEIOCGFWD  _IOWR(0xB1,2, size_t)*/
 103
 104 /* Codes to identify message types */
 105 #define PADI_CODE       0x09
 106 #define PADO_CODE       0x07
 107 #define PADR_CODE       0x19
 108 #define PADS_CODE       0x65
 109 #define PADT_CODE       0xa7
 110 struct pppoe_tag {
 111         __be16 tag_type;
 112         __be16 tag_len;
 113         char tag_data[0];
 114 } __attribute__ ((packed));
 115
 116 /* Tag identifiers */
 117 #define PTT_EOL         __cpu_to_be16(0x0000)
 118 #define PTT_SRV_NAME    __cpu_to_be16(0x0101)
 119 #define PTT_AC_NAME     __cpu_to_be16(0x0102)
 120 #define PTT_HOST_UNIQ   __cpu_to_be16(0x0103)
 121 #define PTT_AC_COOKIE   __cpu_to_be16(0x0104)
 122 #define PTT_VENDOR      __cpu_to_be16(0x0105)
 123 #define PTT_RELAY_SID   __cpu_to_be16(0x0110)
 124 #define PTT_SRV_ERR     __cpu_to_be16(0x0201)
 125 #define PTT_SYS_ERR     __cpu_to_be16(0x0202)
 126 #define PTT_GEN_ERR     __cpu_to_be16(0x0203)
 127
 128 struct pppoe_hdr {
 129 #if defined(__LITTLE_ENDIAN_BITFIELD)
 130         __u8 ver : 4;
 131         __u8 type : 4;
 132 #elif defined(__BIG_ENDIAN_BITFIELD)
 133         __u8 type : 4;
 134         __u8 ver : 4;
 135 #else
 136 #error  "Please fix <asm/byteorder.h>"
 137 #endif
 138         __u8 code;
 139         __be16 sid;
 140         __be16 length;
 141         struct pppoe_tag tag[0];
 142 } __attribute__((packed));
 143
 144 /* Length of entire PPPoE + PPP header */
 145 #define PPPOE_SES_HLEN  8
 146
 147 #ifdef __KERNEL__
 148 #include <linux/skbuff.h>
 149
 150 static inline struct pppoe_hdr *pppoe_hdr(const struct sk_buff *skb)
 151 {
 152         return (struct pppoe_hdr *)skb_network_header(skb);
 153 }
 154
 155 struct pppoe_opt {
 156         struct net_device      *dev;      /* device associated with socket*/
 157         int                     ifindex;  /* ifindex of device associated with socket */
 158         struct pppoe_addr       pa;       /* what this socket is bound to*/
 159         struct sockaddr_pppox   relay;    /* what socket data will be
 160                                              relayed to (PPPoE relaying) */
 161 };
 162
 163 struct pptp_opt {
 164         struct pptp_addr src_addr;
 165         struct pptp_addr dst_addr;
 166         u32 ack_sent, ack_recv;
 167         u32 seq_sent, seq_recv;
 168         int ppp_flags;
 169 };
 170 #include <net/sock.h>
 171
 172 struct pppox_sock {
 173         /* struct sock must be the first member of pppox_sock */
 174         struct sock sk;
 175         struct ppp_channel chan;
 176         struct pppox_sock       *next;    /* for hash table */
 177         union {
 178                 struct pppoe_opt pppoe;
 179                 struct pptp_opt  pptp;
 180         } proto;
 181         __be16                  num;
 182 };
 183 #define pppoe_dev       proto.pppoe.dev
 184 #define pppoe_ifindex   proto.pppoe.ifindex
 185 #define pppoe_pa        proto.pppoe.pa
 186 #define pppoe_relay     proto.pppoe.relay
 187
 188 static inline struct pppox_sock *pppox_sk(struct sock *sk)
 189 {
 190         return (struct pppox_sock *)sk;
 191 }
 192
 193 static inline struct sock *sk_pppox(struct pppox_sock *po)
 194 {
 195         return (struct sock *)po;
 196 }
 197
 198 struct module;
 199
 200 struct pppox_proto {
 201         int             (*create)(struct net *net, struct socket *sock);
 202         int             (*ioctl)(struct socket *sock, unsigned int cmd,
 203                                  unsigned long arg);
 204         struct module   *owner;
 205 };
 206
 207 extern int register_pppox_proto(int proto_num, const struct pppox_proto *pp);
 208 extern void unregister_pppox_proto(int proto_num);
 209 extern void pppox_unbind_sock(struct sock *sk);/* delete ppp-channel binding */
 210 extern int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
 211
 212 /* PPPoX socket states */
 213 enum {
 214     PPPOX_NONE          = 0,  /* initial state */
 215     PPPOX_CONNECTED     = 1,  /* connection established ==TCP_ESTABLISHED */
 216     PPPOX_BOUND         = 2,  /* bound to ppp device */
 217     PPPOX_RELAY         = 4,  /* forwarding is enabled */
 218     PPPOX_ZOMBIE        = 8,  /* dead, but still bound to ppp device */
 219     PPPOX_DEAD          = 16  /* dead, useless, please clean me up!*/
 220 };
 221
 222 #endif /* __KERNEL__ */
 223
 224 #endif /* !(__LINUX_IF_PPPOX_H) */