1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
  2/***************************************************************************
  3 * Linux PPP over L2TP (PPPoL2TP) Socket Implementation (RFC 2661)
  4 *
  5 * This file supplies definitions required by the PPP over L2TP driver
  6 * (l2tp_ppp.c).  All version information wrt this file is located in l2tp_ppp.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_PPPOL2TP_H
 17#define __LINUX_IF_PPPOL2TP_H
 18
 19#include <linux/types.h>
 20#include <linux/in.h>
 21#include <linux/in6.h>
 22#include <linux/l2tp.h>
 23
 24/* Structure used to connect() the socket to a particular tunnel UDP
 25 * socket over IPv4.
 26 */
 27struct pppol2tp_addr {
 28	__kernel_pid_t	pid;		/* pid that owns the fd.
 29					 * 0 => current */
 30	int	fd;			/* FD of UDP socket to use */
 31
 32	struct sockaddr_in addr;	/* IP address and port to send to */
 33
 34	__u16 s_tunnel, s_session;	/* For matching incoming packets */
 35	__u16 d_tunnel, d_session;	/* For sending outgoing packets */
 36};
 37
 38/* Structure used to connect() the socket to a particular tunnel UDP
 39 * socket over IPv6.
 40 */
 41struct pppol2tpin6_addr {
 42	__kernel_pid_t	pid;		/* pid that owns the fd.
 43					 * 0 => current */
 44	int	fd;			/* FD of UDP socket to use */
 45
 46	__u16 s_tunnel, s_session;	/* For matching incoming packets */
 47	__u16 d_tunnel, d_session;	/* For sending outgoing packets */
 48
 49	struct sockaddr_in6 addr;	/* IP address and port to send to */
 50};
 51
 52/* The L2TPv3 protocol changes tunnel and session ids from 16 to 32
 53 * bits. So we need a different sockaddr structure.
 54 */
 55struct pppol2tpv3_addr {
 56	__kernel_pid_t	pid;		/* pid that owns the fd.
 57					 * 0 => current */
 58	int	fd;			/* FD of UDP or IP socket to use */
 59
 60	struct sockaddr_in addr;	/* IP address and port to send to */
 61
 62	__u32 s_tunnel, s_session;	/* For matching incoming packets */
 63	__u32 d_tunnel, d_session;	/* For sending outgoing packets */
 64};
 65
 66struct pppol2tpv3in6_addr {
 67	__kernel_pid_t	pid;		/* pid that owns the fd.
 68					 * 0 => current */
 69	int	fd;			/* FD of UDP or IP socket to use */
 70
 71	__u32 s_tunnel, s_session;	/* For matching incoming packets */
 72	__u32 d_tunnel, d_session;	/* For sending outgoing packets */
 73
 74	struct sockaddr_in6 addr;	/* IP address and port to send to */
 75};
 76
 77/* Socket options:
 78 * DEBUG	- bitmask of debug message categories (not used)
 79 * SENDSEQ	- 0 => don't send packets with sequence numbers
 80 *		  1 => send packets with sequence numbers
 81 * RECVSEQ	- 0 => receive packet sequence numbers are optional
 82 *		  1 => drop receive packets without sequence numbers
 83 * LNSMODE	- 0 => act as LAC.
 84 *		  1 => act as LNS.
 85 * REORDERTO	- reorder timeout (in millisecs). If 0, don't try to reorder.
 86 */
 87enum {
 88	PPPOL2TP_SO_DEBUG	= 1,
 89	PPPOL2TP_SO_RECVSEQ	= 2,
 90	PPPOL2TP_SO_SENDSEQ	= 3,
 91	PPPOL2TP_SO_LNSMODE	= 4,
 92	PPPOL2TP_SO_REORDERTO	= 5,
 93};
 94
 95/* Debug message categories for the DEBUG socket option (deprecated) */
 96enum {
 97	PPPOL2TP_MSG_DEBUG	= L2TP_MSG_DEBUG,
 98	PPPOL2TP_MSG_CONTROL	= L2TP_MSG_CONTROL,
 99	PPPOL2TP_MSG_SEQ	= L2TP_MSG_SEQ,
100	PPPOL2TP_MSG_DATA	= L2TP_MSG_DATA,
101};
102
103
104
105#endif /* __LINUX_IF_PPPOL2TP_H */