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Linux/include/uapi/linux/if_pppox.h

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  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 _UAPI__LINUX_IF_PPPOX_H
 18 #define _UAPI__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 } __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 } __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 } __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 } __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 } __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[0];
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[0];
154 } __packed;
155 
156 /* Length of entire PPPoE + PPP header */
157 #define PPPOE_SES_HLEN  8
158 
159 
160 #endif /* _UAPI__LINUX_IF_PPPOX_H */
161 

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