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/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/***************************************************************************
* 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 __LINUX_IF_PPPOL2TP_H
#define __LINUX_IF_PPPOL2TP_H
#include <linux/types.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/l2tp.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 (deprecated) */
enum {
PPPOL2TP_MSG_DEBUG = L2TP_MSG_DEBUG,
PPPOL2TP_MSG_CONTROL = L2TP_MSG_CONTROL,
PPPOL2TP_MSG_SEQ = L2TP_MSG_SEQ,
PPPOL2TP_MSG_DATA = L2TP_MSG_DATA,
};
#endif /* __LINUX_IF_PPPOL2TP_H */