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/***************************************************************************

 * Linux PPP over X - Generic PPP transport layer sockets

 * Linux PPP over Ethernet (PPPoE) Socket Implementation (RFC 2516)

 *

 * This file supplies definitions required by the PPP over Ethernet driver

 * (pppox.c).  All version information wrt this file is located in pppox.c

 *

 * License:

 *              This program is free software; you can redistribute it and/or

 *              modify it under the terms of the GNU General Public License

 *              as published by the Free Software Foundation; either version

 *              2 of the License, or (at your option) any later version.

 *

 */

#ifndef __LINUX_IF_PPPOX_H

#define __LINUX_IF_PPPOX_H

#include <linux/types.h>

#include <asm/byteorder.h>

#include <linux/socket.h>

#include <linux/if_ether.h>

#include <linux/if_pppol2tp.h>

/* For user-space programs to pick up these definitions

 * which they wouldn't get otherwise without defining __KERNEL__

 */

#ifndef AF_PPPOX

#define AF_PPPOX        24

#define PF_PPPOX        AF_PPPOX

#endif /* !(AF_PPPOX) */

/************************************************************************

 * PPPoE addressing definition

 */

typedef __be16 sid_t;

struct pppoe_addr {

        sid_t         sid;                    /* Session identifier */

        unsigned char remote[ETH_ALEN];       /* Remote address */

        char          dev[IFNAMSIZ];          /* Local device to use */

};

/************************************************************************

 * PPTP addressing definition

 */

struct pptp_addr {

        __u16           call_id;

        struct in_addr  sin_addr;

};

/************************************************************************

 * Protocols supported by AF_PPPOX

 */

#define PX_PROTO_OE    0 /* Currently just PPPoE */

#define PX_PROTO_OL2TP 1 /* Now L2TP also */

#define PX_PROTO_PPTP  2

#define PX_MAX_PROTO   3

struct sockaddr_pppox {

        __kernel_sa_family_t sa_family;       /* address family, AF_PPPOX */

        unsigned int    sa_protocol;          /* protocol identifier */

        union {

                struct pppoe_addr  pppoe;

                struct pptp_addr   pptp;

        } sa_addr;

} __attribute__((packed));

/* The use of the above union isn't viable because the size of this

 * struct must stay fixed over time -- applications use sizeof(struct

 * sockaddr_pppox) to fill it. We use a protocol specific sockaddr

 * type instead.

 */

struct sockaddr_pppol2tp {

        __kernel_sa_family_t sa_family; /* address family, AF_PPPOX */

        unsigned int    sa_protocol;    /* protocol identifier */

        struct pppol2tp_addr pppol2tp;

} __attribute__((packed));

struct sockaddr_pppol2tpin6 {

        __kernel_sa_family_t sa_family; /* address family, AF_PPPOX */

        unsigned int    sa_protocol;    /* protocol identifier */

        struct pppol2tpin6_addr pppol2tp;

} __attribute__((packed));

/* The L2TPv3 protocol changes tunnel and session ids from 16 to 32

 * bits. So we need a different sockaddr structure.

 */

struct sockaddr_pppol2tpv3 {

        __kernel_sa_family_t sa_family; /* address family, AF_PPPOX */

        unsigned int    sa_protocol;    /* protocol identifier */

        struct pppol2tpv3_addr pppol2tp;

} __attribute__((packed));

struct sockaddr_pppol2tpv3in6 {

        __kernel_sa_family_t sa_family; /* address family, AF_PPPOX */

        unsigned int    sa_protocol;    /* protocol identifier */

        struct pppol2tpv3in6_addr pppol2tp;

} __attribute__((packed));

/*********************************************************************

 *

 * ioctl interface for defining forwarding of connections

 *

 ********************************************************************/

#define PPPOEIOCSFWD    _IOW(0xB1 ,0, size_t)

#define PPPOEIOCDFWD    _IO(0xB1 ,1)

/*#define PPPOEIOCGFWD  _IOWR(0xB1,2, size_t)*/

/* Codes to identify message types */

#define PADI_CODE       0x09

#define PADO_CODE       0x07

#define PADR_CODE       0x19

#define PADS_CODE       0x65

#define PADT_CODE       0xa7

struct pppoe_tag {

        __be16 tag_type;

        __be16 tag_len;

        char tag_data[0];

} __attribute__ ((packed));

/* Tag identifiers */

#define PTT_EOL         __cpu_to_be16(0x0000)

#define PTT_SRV_NAME    __cpu_to_be16(0x0101)

#define PTT_AC_NAME     __cpu_to_be16(0x0102)

#define PTT_HOST_UNIQ   __cpu_to_be16(0x0103)

#define PTT_AC_COOKIE   __cpu_to_be16(0x0104)

#define PTT_VENDOR      __cpu_to_be16(0x0105)

#define PTT_RELAY_SID   __cpu_to_be16(0x0110)

#define PTT_SRV_ERR     __cpu_to_be16(0x0201)

#define PTT_SYS_ERR     __cpu_to_be16(0x0202)

#define PTT_GEN_ERR     __cpu_to_be16(0x0203)

struct pppoe_hdr {

#if defined(__LITTLE_ENDIAN_BITFIELD)

        __u8 type : 4;

        __u8 ver : 4;

#elif defined(__BIG_ENDIAN_BITFIELD)

        __u8 ver : 4;

        __u8 type : 4;

#else

#error  "Please fix <asm/byteorder.h>"

#endif

        __u8 code;

        __be16 sid;

        __be16 length;

        struct pppoe_tag tag[0];

} __attribute__((packed));

/* Length of entire PPPoE + PPP header */

#define PPPOE_SES_HLEN  8

#endif /* __LINUX_IF_PPPOX_H */