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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 <linux/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 <linux/ppp_channel.h>
28#endif /* __KERNEL__ */
29#include <linux/if_pppol2tp.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 __be16 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 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 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/* The L2TPv3 protocol changes tunnel and session ids from 16 to 32
86 * bits. So we need a different sockaddr structure.
87 */
88struct sockaddr_pppol2tpv3 {
89 sa_family_t sa_family; /* address family, AF_PPPOX */
90 unsigned int sa_protocol; /* protocol identifier */
91 struct pppol2tpv3_addr pppol2tp;
92} __attribute__((packed));
93
94/*********************************************************************
95 *
96 * ioctl interface for defining forwarding of connections
97 *
98 ********************************************************************/
99
100#define PPPOEIOCSFWD _IOW(0xB1 ,0, size_t)
101#define PPPOEIOCDFWD _IO(0xB1 ,1)
102/*#define PPPOEIOCGFWD _IOWR(0xB1,2, size_t)*/
103
104/* Codes to identify message types */
105#define PADI_CODE 0x09
106#define PADO_CODE 0x07
107#define PADR_CODE 0x19
108#define PADS_CODE 0x65
109#define PADT_CODE 0xa7
110struct pppoe_tag {
111 __be16 tag_type;
112 __be16 tag_len;
113 char tag_data[0];
114} __attribute__ ((packed));
115
116/* Tag identifiers */
117#define PTT_EOL __cpu_to_be16(0x0000)
118#define PTT_SRV_NAME __cpu_to_be16(0x0101)
119#define PTT_AC_NAME __cpu_to_be16(0x0102)
120#define PTT_HOST_UNIQ __cpu_to_be16(0x0103)
121#define PTT_AC_COOKIE __cpu_to_be16(0x0104)
122#define PTT_VENDOR __cpu_to_be16(0x0105)
123#define PTT_RELAY_SID __cpu_to_be16(0x0110)
124#define PTT_SRV_ERR __cpu_to_be16(0x0201)
125#define PTT_SYS_ERR __cpu_to_be16(0x0202)
126#define PTT_GEN_ERR __cpu_to_be16(0x0203)
127
128struct pppoe_hdr {
129#if defined(__LITTLE_ENDIAN_BITFIELD)
130 __u8 ver : 4;
131 __u8 type : 4;
132#elif defined(__BIG_ENDIAN_BITFIELD)
133 __u8 type : 4;
134 __u8 ver : 4;
135#else
136#error "Please fix <asm/byteorder.h>"
137#endif
138 __u8 code;
139 __be16 sid;
140 __be16 length;
141 struct pppoe_tag tag[0];
142} __attribute__((packed));
143
144/* Length of entire PPPoE + PPP header */
145#define PPPOE_SES_HLEN 8
146
147#ifdef __KERNEL__
148#include <linux/skbuff.h>
149
150static inline struct pppoe_hdr *pppoe_hdr(const struct sk_buff *skb)
151{
152 return (struct pppoe_hdr *)skb_network_header(skb);
153}
154
155struct pppoe_opt {
156 struct net_device *dev; /* device associated with socket*/
157 int ifindex; /* ifindex of device associated with socket */
158 struct pppoe_addr pa; /* what this socket is bound to*/
159 struct sockaddr_pppox relay; /* what socket data will be
160 relayed to (PPPoE relaying) */
161};
162
163struct pptp_opt {
164 struct pptp_addr src_addr;
165 struct pptp_addr dst_addr;
166 u32 ack_sent, ack_recv;
167 u32 seq_sent, seq_recv;
168 int ppp_flags;
169};
170#include <net/sock.h>
171
172struct pppox_sock {
173 /* struct sock must be the first member of pppox_sock */
174 struct sock sk;
175 struct ppp_channel chan;
176 struct pppox_sock *next; /* for hash table */
177 union {
178 struct pppoe_opt pppoe;
179 struct pptp_opt pptp;
180 } proto;
181 __be16 num;
182};
183#define pppoe_dev proto.pppoe.dev
184#define pppoe_ifindex proto.pppoe.ifindex
185#define pppoe_pa proto.pppoe.pa
186#define pppoe_relay proto.pppoe.relay
187
188static inline struct pppox_sock *pppox_sk(struct sock *sk)
189{
190 return (struct pppox_sock *)sk;
191}
192
193static inline struct sock *sk_pppox(struct pppox_sock *po)
194{
195 return (struct sock *)po;
196}
197
198struct module;
199
200struct pppox_proto {
201 int (*create)(struct net *net, struct socket *sock);
202 int (*ioctl)(struct socket *sock, unsigned int cmd,
203 unsigned long arg);
204 struct module *owner;
205};
206
207extern int register_pppox_proto(int proto_num, const struct pppox_proto *pp);
208extern void unregister_pppox_proto(int proto_num);
209extern void pppox_unbind_sock(struct sock *sk);/* delete ppp-channel binding */
210extern int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
211
212/* PPPoX socket states */
213enum {
214 PPPOX_NONE = 0, /* initial state */
215 PPPOX_CONNECTED = 1, /* connection established ==TCP_ESTABLISHED */
216 PPPOX_BOUND = 2, /* bound to ppp device */
217 PPPOX_RELAY = 4, /* forwarding is enabled */
218 PPPOX_ZOMBIE = 8, /* dead, but still bound to ppp device */
219 PPPOX_DEAD = 16 /* dead, useless, please clean me up!*/
220};
221
222#endif /* __KERNEL__ */
223
224#endif /* !(__LINUX_IF_PPPOX_H) */