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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 __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 */
42typedef __be16 sid_t;
43struct 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 */
52struct 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
65struct 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 */
79struct 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
85struct 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 */
94struct 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
100struct 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
122struct 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
140struct 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 */