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1/***************************************************************************
2 * Linux PPP over X - Generic PPP transport layer sockets
3 * Linux PPP over Ethernet (PPPoE) Socket Implementation (RFC 2516)
4 *
5 * This file supplies definitions required by the PPP over Ethernet driver
6 * (pppox.c). All version information wrt this file is located in pppox.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_PPPOX_H
17#define __LINUX_IF_PPPOX_H
18
19
20#include <asm/types.h>
21#include <asm/byteorder.h>
22
23#ifdef __KERNEL__
24#include <linux/if_ether.h>
25#include <linux/if.h>
26#include <linux/netdevice.h>
27#include <asm/semaphore.h>
28#include <linux/ppp_channel.h>
29#endif /* __KERNEL__ */
30#include <linux/if_pppol2tp.h>
31
32/* For user-space programs to pick up these definitions
33 * which they wouldn't get otherwise without defining __KERNEL__
34 */
35#ifndef AF_PPPOX
36#define AF_PPPOX 24
37#define PF_PPPOX AF_PPPOX
38#endif /* !(AF_PPPOX) */
39
40/************************************************************************
41 * PPPoE addressing definition
42 */
43typedef __be16 sid_t;
44struct pppoe_addr{
45 sid_t sid; /* Session identifier */
46 unsigned char remote[ETH_ALEN]; /* Remote address */
47 char dev[IFNAMSIZ]; /* Local device to use */
48};
49
50/************************************************************************
51 * Protocols supported by AF_PPPOX
52 */
53#define PX_PROTO_OE 0 /* Currently just PPPoE */
54#define PX_PROTO_OL2TP 1 /* Now L2TP also */
55#define PX_MAX_PROTO 2
56
57struct sockaddr_pppox {
58 sa_family_t sa_family; /* address family, AF_PPPOX */
59 unsigned int sa_protocol; /* protocol identifier */
60 union{
61 struct pppoe_addr pppoe;
62 }sa_addr;
63}__attribute__ ((packed));
64
65/* The use of the above union isn't viable because the size of this
66 * struct must stay fixed over time -- applications use sizeof(struct
67 * sockaddr_pppox) to fill it. We use a protocol specific sockaddr
68 * type instead.
69 */
70struct sockaddr_pppol2tp {
71 sa_family_t sa_family; /* address family, AF_PPPOX */
72 unsigned int sa_protocol; /* protocol identifier */
73 struct pppol2tp_addr pppol2tp;
74}__attribute__ ((packed));
75
76/*********************************************************************
77 *
78 * ioctl interface for defining forwarding of connections
79 *
80 ********************************************************************/
81
82#define PPPOEIOCSFWD _IOW(0xB1 ,0, size_t)
83#define PPPOEIOCDFWD _IO(0xB1 ,1)
84/*#define PPPOEIOCGFWD _IOWR(0xB1,2, size_t)*/
85
86/* Codes to identify message types */
87#define PADI_CODE 0x09
88#define PADO_CODE 0x07
89#define PADR_CODE 0x19
90#define PADS_CODE 0x65
91#define PADT_CODE 0xa7
92struct pppoe_tag {
93 __be16 tag_type;
94 __be16 tag_len;
95 char tag_data[0];
96} __attribute ((packed));
97
98/* Tag identifiers */
99#define PTT_EOL __constant_htons(0x0000)
100#define PTT_SRV_NAME __constant_htons(0x0101)
101#define PTT_AC_NAME __constant_htons(0x0102)
102#define PTT_HOST_UNIQ __constant_htons(0x0103)
103#define PTT_AC_COOKIE __constant_htons(0x0104)
104#define PTT_VENDOR __constant_htons(0x0105)
105#define PTT_RELAY_SID __constant_htons(0x0110)
106#define PTT_SRV_ERR __constant_htons(0x0201)
107#define PTT_SYS_ERR __constant_htons(0x0202)
108#define PTT_GEN_ERR __constant_htons(0x0203)
109
110struct pppoe_hdr {
111#if defined(__LITTLE_ENDIAN_BITFIELD)
112 __u8 ver : 4;
113 __u8 type : 4;
114#elif defined(__BIG_ENDIAN_BITFIELD)
115 __u8 type : 4;
116 __u8 ver : 4;
117#else
118#error "Please fix <asm/byteorder.h>"
119#endif
120 __u8 code;
121 __be16 sid;
122 __be16 length;
123 struct pppoe_tag tag[0];
124} __attribute__ ((packed));
125
126/* Length of entire PPPoE + PPP header */
127#define PPPOE_SES_HLEN 8
128
129#ifdef __KERNEL__
130#include <linux/skbuff.h>
131
132static inline struct pppoe_hdr *pppoe_hdr(const struct sk_buff *skb)
133{
134 return (struct pppoe_hdr *)skb_network_header(skb);
135}
136
137struct pppoe_opt {
138 struct net_device *dev; /* device associated with socket*/
139 int ifindex; /* ifindex of device associated with socket */
140 struct pppoe_addr pa; /* what this socket is bound to*/
141 struct sockaddr_pppox relay; /* what socket data will be
142 relayed to (PPPoE relaying) */
143};
144
145#include <net/sock.h>
146
147struct pppox_sock {
148 /* struct sock must be the first member of pppox_sock */
149 struct sock sk;
150 struct ppp_channel chan;
151 struct pppox_sock *next; /* for hash table */
152 union {
153 struct pppoe_opt pppoe;
154 } proto;
155 __be16 num;
156};
157#define pppoe_dev proto.pppoe.dev
158#define pppoe_ifindex proto.pppoe.ifindex
159#define pppoe_pa proto.pppoe.pa
160#define pppoe_relay proto.pppoe.relay
161
162static inline struct pppox_sock *pppox_sk(struct sock *sk)
163{
164 return (struct pppox_sock *)sk;
165}
166
167static inline struct sock *sk_pppox(struct pppox_sock *po)
168{
169 return (struct sock *)po;
170}
171
172struct module;
173
174struct pppox_proto {
175 int (*create)(struct net *net, struct socket *sock);
176 int (*ioctl)(struct socket *sock, unsigned int cmd,
177 unsigned long arg);
178 struct module *owner;
179};
180
181extern int register_pppox_proto(int proto_num, struct pppox_proto *pp);
182extern void unregister_pppox_proto(int proto_num);
183extern void pppox_unbind_sock(struct sock *sk);/* delete ppp-channel binding */
184extern int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
185
186/* PPPoX socket states */
187enum {
188 PPPOX_NONE = 0, /* initial state */
189 PPPOX_CONNECTED = 1, /* connection established ==TCP_ESTABLISHED */
190 PPPOX_BOUND = 2, /* bound to ppp device */
191 PPPOX_RELAY = 4, /* forwarding is enabled */
192 PPPOX_ZOMBIE = 8, /* dead, but still bound to ppp device */
193 PPPOX_DEAD = 16 /* dead, useless, please clean me up!*/
194};
195
196#endif /* __KERNEL__ */
197
198#endif /* !(__LINUX_IF_PPPOX_H) */