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                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;">/* 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 &lt;linux/types.h&gt;
#include &lt;linux/in.h&gt;
#include &lt;linux/in6.h&gt;
#include &lt;linux/l2tp.h&gt;

/* 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 =&gt; 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 =&gt; 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 =&gt; 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 =&gt; 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 =&gt; don&#039;t send packets with sequence numbers
 *		  1 =&gt; send packets with sequence numbers
 * RECVSEQ	- 0 =&gt; receive packet sequence numbers are optional
 *		  1 =&gt; drop receive packets without sequence numbers
 * LNSMODE	- 0 =&gt; act as LAC.
 *		  1 =&gt; act as LNS.
 * REORDERTO	- reorder timeout (in millisecs). If 0, don&#039;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 */
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