1. 根目录:
2. include
3. linux
4. if_pppol2tp.h

/***************************************************************************
 * 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/in.h>
#include <linux/in6.h>
#include <uapi/linux/if_pppol2tp.h>

#endif