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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