The C and C++ Include Header Files

/usr/include/linux/if_pppox.h


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

     1	/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
     2	/***************************************************************************
     3	 * Linux PPP over X - Generic PPP transport layer sockets
     4	 * Linux PPP over Ethernet (PPPoE) Socket Implementation (RFC 2516) 
     5	 *
     6	 * This file supplies definitions required by the PPP over Ethernet driver
     7	 * (pppox.c).  All version information wrt this file is located in pppox.c
     8	 *
     9	 * License:
    10	 *		This program is free software; you can redistribute it and/or
    11	 *		modify it under the terms of the GNU General Public License
    12	 *		as published by the Free Software Foundation; either version
    13	 *		2 of the License, or (at your option) any later version.
    14	 *
    15	 */
    16	
    17	#ifndef __LINUX_IF_PPPOX_H
    18	#define __LINUX_IF_PPPOX_H
    19	
    20	
    21	#include <linux/types.h>
    22	#include <asm/byteorder.h>
    23	
    24	#include <linux/socket.h>
    25	#include <linux/if.h>
    26	#include <linux/if_ether.h>
    27	#include <linux/if_pppol2tp.h>
    28	#include <linux/in.h>
    29	#include <linux/in6.h>
    30	
    31	/* For user-space programs to pick up these definitions
    32	 * which they wouldn't get otherwise without defining __KERNEL__
    33	 */
    34	#ifndef AF_PPPOX
    35	#define AF_PPPOX	24
    36	#define PF_PPPOX	AF_PPPOX
    37	#endif /* !(AF_PPPOX) */
    38	
    39	/************************************************************************ 
    40	 * PPPoE addressing definition 
    41	 */ 
    42	typedef __be16 sid_t;
    43	struct pppoe_addr {
    44		sid_t         sid;                    /* Session identifier */
    45		unsigned char remote[ETH_ALEN];       /* Remote address */
    46		char          dev[IFNAMSIZ];          /* Local device to use */
    47	}; 
    48	 
    49	/************************************************************************ 
    50	 * PPTP addressing definition
    51	 */
    52	struct pptp_addr {
    53		__u16		call_id;
    54		struct in_addr	sin_addr;
    55	};
    56	
    57	/************************************************************************
    58	 * Protocols supported by AF_PPPOX
    59	 */
    60	#define PX_PROTO_OE    0 /* Currently just PPPoE */
    61	#define PX_PROTO_OL2TP 1 /* Now L2TP also */
    62	#define PX_PROTO_PPTP  2
    63	#define PX_MAX_PROTO   3
    64	
    65	struct sockaddr_pppox {
    66		__kernel_sa_family_t sa_family;       /* address family, AF_PPPOX */
    67		unsigned int    sa_protocol;          /* protocol identifier */
    68		union {
    69			struct pppoe_addr  pppoe;
    70			struct pptp_addr   pptp;
    71		} sa_addr;
    72	} __attribute__((packed));
    73	
    74	/* The use of the above union isn't viable because the size of this
    75	 * struct must stay fixed over time -- applications use sizeof(struct
    76	 * sockaddr_pppox) to fill it. We use a protocol specific sockaddr
    77	 * type instead.
    78	 */
    79	struct sockaddr_pppol2tp {
    80		__kernel_sa_family_t sa_family; /* address family, AF_PPPOX */
    81		unsigned int    sa_protocol;    /* protocol identifier */
    82		struct pppol2tp_addr pppol2tp;
    83	} __attribute__((packed));
    84	
    85	struct sockaddr_pppol2tpin6 {
    86		__kernel_sa_family_t sa_family; /* address family, AF_PPPOX */
    87		unsigned int    sa_protocol;    /* protocol identifier */
    88		struct pppol2tpin6_addr pppol2tp;
    89	} __attribute__((packed));
    90	
    91	/* The L2TPv3 protocol changes tunnel and session ids from 16 to 32
    92	 * bits. So we need a different sockaddr structure.
    93	 */
    94	struct sockaddr_pppol2tpv3 {
    95		__kernel_sa_family_t sa_family; /* address family, AF_PPPOX */
    96		unsigned int    sa_protocol;    /* protocol identifier */
    97		struct pppol2tpv3_addr pppol2tp;
    98	} __attribute__((packed));
    99	
   100	struct sockaddr_pppol2tpv3in6 {
   101		__kernel_sa_family_t sa_family; /* address family, AF_PPPOX */
   102		unsigned int    sa_protocol;    /* protocol identifier */
   103		struct pppol2tpv3in6_addr pppol2tp;
   104	} __attribute__((packed));
   105	
   106	/*********************************************************************
   107	 *
   108	 * ioctl interface for defining forwarding of connections
   109	 *
   110	 ********************************************************************/
   111	
   112	#define PPPOEIOCSFWD	_IOW(0xB1 ,0, size_t)
   113	#define PPPOEIOCDFWD	_IO(0xB1 ,1)
   114	/*#define PPPOEIOCGFWD	_IOWR(0xB1,2, size_t)*/
   115	
   116	/* Codes to identify message types */
   117	#define PADI_CODE	0x09
   118	#define PADO_CODE	0x07
   119	#define PADR_CODE	0x19
   120	#define PADS_CODE	0x65
   121	#define PADT_CODE	0xa7
   122	struct pppoe_tag {
   123		__be16 tag_type;
   124		__be16 tag_len;
   125		char tag_data[];
   126	} __attribute__ ((packed));
   127	
   128	/* Tag identifiers */
   129	#define PTT_EOL		__cpu_to_be16(0x0000)
   130	#define PTT_SRV_NAME	__cpu_to_be16(0x0101)
   131	#define PTT_AC_NAME	__cpu_to_be16(0x0102)
   132	#define PTT_HOST_UNIQ	__cpu_to_be16(0x0103)
   133	#define PTT_AC_COOKIE	__cpu_to_be16(0x0104)
   134	#define PTT_VENDOR 	__cpu_to_be16(0x0105)
   135	#define PTT_RELAY_SID	__cpu_to_be16(0x0110)
   136	#define PTT_SRV_ERR     __cpu_to_be16(0x0201)
   137	#define PTT_SYS_ERR  	__cpu_to_be16(0x0202)
   138	#define PTT_GEN_ERR  	__cpu_to_be16(0x0203)
   139	
   140	struct pppoe_hdr {
   141	#if defined(__LITTLE_ENDIAN_BITFIELD)
   142		__u8 type : 4;
   143		__u8 ver : 4;
   144	#elif defined(__BIG_ENDIAN_BITFIELD)
   145		__u8 ver : 4;
   146		__u8 type : 4;
   147	#else
   148	#error	"Please fix <asm/byteorder.h>"
   149	#endif
   150		__u8 code;
   151		__be16 sid;
   152		__be16 length;
   153		struct pppoe_tag tag[];
   154	} __attribute__((packed));
   155	
   156	/* Length of entire PPPoE + PPP header */
   157	#define PPPOE_SES_HLEN	8
   158	
   159	
   160	#endif /* __LINUX_IF_PPPOX_H */