/***************************************************************************
* Linux PPP over L2TP (PPPoL2TP) Socket Implementation (RFC 2661)
*
* This file supplies definitions required by the PPP over L2TP driver
* (l2tp_ppp.c). All version information wrt this file is located in l2tp_ppp.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 _UAPI__LINUX_IF_PPPOL2TP_H
#define _UAPI__LINUX_IF_PPPOL2TP_H

#include <linux/types.h>


/* Structure used to connect() the socket to a particular tunnel UDP
* socket over IPv4.
*/
struct pppol2tp_addr {
__kernel_pid_t pid; /* pid that owns the fd.
* 0 => current */
int fd; /* FD of UDP socket to use */

struct sockaddr_in addr; /* IP address and port to send to */

__u16 s_tunnel, s_session; /* For matching incoming packets */
__u16 d_tunnel, d_session; /* For sending outgoing packets */
};

/* Structure used to connect() the socket to a particular tunnel UDP
* socket over IPv6.
*/
struct pppol2tpin6_addr {
__kernel_pid_t pid; /* pid that owns the fd.
* 0 => current */
int fd; /* FD of UDP socket to use */

__u16 s_tunnel, s_session; /* For matching incoming packets */
__u16 d_tunnel, d_session; /* For sending outgoing packets */

struct sockaddr_in6 addr; /* IP address and port to send to */
};

/* The L2TPv3 protocol changes tunnel and session ids from 16 to 32
* bits. So we need a different sockaddr structure.
*/
struct pppol2tpv3_addr {
__kernel_pid_t pid; /* pid that owns the fd.
* 0 => current */
int fd; /* FD of UDP or IP socket to use */

struct sockaddr_in addr; /* IP address and port to send to */

__u32 s_tunnel, s_session; /* For matching incoming packets */
__u32 d_tunnel, d_session; /* For sending outgoing packets */
};

struct pppol2tpv3in6_addr {
__kernel_pid_t pid; /* pid that owns the fd.
* 0 => current */
int fd; /* FD of UDP or IP socket to use */

__u32 s_tunnel, s_session; /* For matching incoming packets */
__u32 d_tunnel, d_session; /* For sending outgoing packets */

struct sockaddr_in6 addr; /* IP address and port to send to */
};

/* Socket options:
* DEBUG - bitmask of debug message categories
* SENDSEQ - 0 => don't send packets with sequence numbers
* 1 => send packets with sequence numbers
* RECVSEQ - 0 => receive packet sequence numbers are optional
* 1 => drop receive packets without sequence numbers
* LNSMODE - 0 => act as LAC.
* 1 => act as LNS.
* REORDERTO - reorder timeout (in millisecs). If 0, don't try to reorder.
*/
enum {
PPPOL2TP_SO_DEBUG = 1,
PPPOL2TP_SO_RECVSEQ = 2,
PPPOL2TP_SO_SENDSEQ = 3,
PPPOL2TP_SO_LNSMODE = 4,
PPPOL2TP_SO_REORDERTO = 5,
};

/* Debug message categories for the DEBUG socket option */
enum {
PPPOL2TP_MSG_DEBUG = (1 << 0), /* verbose debug (if
* compiled in) */
PPPOL2TP_MSG_CONTROL = (1 << 1), /* userspace - kernel
* interface */
PPPOL2TP_MSG_SEQ = (1 << 2), /* sequence numbers */
PPPOL2TP_MSG_DATA = (1 << 3), /* data packets */
};



#endif /* _UAPI__LINUX_IF_PPPOL2TP_H */