The C and C++ Include Header Files

/usr/include/linux/if_pppol2tp.h


$ cat -n /usr/include/linux/if_pppol2tp.h

     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	 */
    27	struct 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	 */
    41	struct 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	 */
    55	struct 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	
    66	struct 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	 */
    87	enum {
    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) */
    96	enum {
    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 */