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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#include <linux/socket.h>
24#include <linux/if_ether.h>
25#ifdef __KERNEL__
26#include <linux/if.h>
27#include <linux/netdevice.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 * PPTP addressing definition
52 */
53struct pptp_addr {
54 __be16 call_id;
55 struct in_addr sin_addr;
56};
57
58/************************************************************************
59 * Protocols supported by AF_PPPOX
60 */
61#define PX_PROTO_OE 0 /* Currently just PPPoE */
62#define PX_PROTO_OL2TP 1 /* Now L2TP also */
63#define PX_PROTO_PPTP 2
64#define PX_MAX_PROTO 3
65
66struct sockaddr_pppox {
67 __kernel_sa_family_t sa_family; /* address family, AF_PPPOX */
68 unsigned int sa_protocol; /* protocol identifier */
69 union {
70 struct pppoe_addr pppoe;
71 struct pptp_addr pptp;
72 } sa_addr;
73} __packed;
74
75/* The use of the above union isn't viable because the size of this
76 * struct must stay fixed over time -- applications use sizeof(struct
77 * sockaddr_pppox) to fill it. We use a protocol specific sockaddr
78 * type instead.
79 */
80struct sockaddr_pppol2tp {
81 __kernel_sa_family_t sa_family; /* address family, AF_PPPOX */
82 unsigned int sa_protocol; /* protocol identifier */
83 struct pppol2tp_addr pppol2tp;
84} __packed;
85
86struct sockaddr_pppol2tpin6 {
87 __kernel_sa_family_t sa_family; /* address family, AF_PPPOX */
88 unsigned int sa_protocol; /* protocol identifier */
89 struct pppol2tpin6_addr pppol2tp;
90} __packed;
91
92/* The L2TPv3 protocol changes tunnel and session ids from 16 to 32
93 * bits. So we need a different sockaddr structure.
94 */
95struct sockaddr_pppol2tpv3 {
96 __kernel_sa_family_t sa_family; /* address family, AF_PPPOX */
97 unsigned int sa_protocol; /* protocol identifier */
98 struct pppol2tpv3_addr pppol2tp;
99} __packed;
100
101struct sockaddr_pppol2tpv3in6 {
102 __kernel_sa_family_t sa_family; /* address family, AF_PPPOX */
103 unsigned int sa_protocol; /* protocol identifier */
104 struct pppol2tpv3in6_addr pppol2tp;
105} __packed;
106
107/*********************************************************************
108 *
109 * ioctl interface for defining forwarding of connections
110 *
111 ********************************************************************/
112
113#define PPPOEIOCSFWD _IOW(0xB1 ,0, size_t)
114#define PPPOEIOCDFWD _IO(0xB1 ,1)
115/*#define PPPOEIOCGFWD _IOWR(0xB1,2, size_t)*/
116
117/* Codes to identify message types */
118#define PADI_CODE 0x09
119#define PADO_CODE 0x07
120#define PADR_CODE 0x19
121#define PADS_CODE 0x65
122#define PADT_CODE 0xa7
123struct pppoe_tag {
124 __be16 tag_type;
125 __be16 tag_len;
126 char tag_data[0];
127} __attribute__ ((packed));
128
129/* Tag identifiers */
130#define PTT_EOL __cpu_to_be16(0x0000)
131#define PTT_SRV_NAME __cpu_to_be16(0x0101)
132#define PTT_AC_NAME __cpu_to_be16(0x0102)
133#define PTT_HOST_UNIQ __cpu_to_be16(0x0103)
134#define PTT_AC_COOKIE __cpu_to_be16(0x0104)
135#define PTT_VENDOR __cpu_to_be16(0x0105)
136#define PTT_RELAY_SID __cpu_to_be16(0x0110)
137#define PTT_SRV_ERR __cpu_to_be16(0x0201)
138#define PTT_SYS_ERR __cpu_to_be16(0x0202)
139#define PTT_GEN_ERR __cpu_to_be16(0x0203)
140
141struct pppoe_hdr {
142#if defined(__LITTLE_ENDIAN_BITFIELD)
143 __u8 ver : 4;
144 __u8 type : 4;
145#elif defined(__BIG_ENDIAN_BITFIELD)
146 __u8 type : 4;
147 __u8 ver : 4;
148#else
149#error "Please fix <asm/byteorder.h>"
150#endif
151 __u8 code;
152 __be16 sid;
153 __be16 length;
154 struct pppoe_tag tag[0];
155} __packed;
156
157/* Length of entire PPPoE + PPP header */
158#define PPPOE_SES_HLEN 8
159
160#ifdef __KERNEL__
161#include <linux/skbuff.h>
162
163static inline struct pppoe_hdr *pppoe_hdr(const struct sk_buff *skb)
164{
165 return (struct pppoe_hdr *)skb_network_header(skb);
166}
167
168struct pppoe_opt {
169 struct net_device *dev; /* device associated with socket*/
170 int ifindex; /* ifindex of device associated with socket */
171 struct pppoe_addr pa; /* what this socket is bound to*/
172 struct sockaddr_pppox relay; /* what socket data will be
173 relayed to (PPPoE relaying) */
174};
175
176struct pptp_opt {
177 struct pptp_addr src_addr;
178 struct pptp_addr dst_addr;
179 u32 ack_sent, ack_recv;
180 u32 seq_sent, seq_recv;
181 int ppp_flags;
182};
183#include <net/sock.h>
184
185struct pppox_sock {
186 /* struct sock must be the first member of pppox_sock */
187 struct sock sk;
188 struct ppp_channel chan;
189 struct pppox_sock *next; /* for hash table */
190 union {
191 struct pppoe_opt pppoe;
192 struct pptp_opt pptp;
193 } proto;
194 __be16 num;
195};
196#define pppoe_dev proto.pppoe.dev
197#define pppoe_ifindex proto.pppoe.ifindex
198#define pppoe_pa proto.pppoe.pa
199#define pppoe_relay proto.pppoe.relay
200
201static inline struct pppox_sock *pppox_sk(struct sock *sk)
202{
203 return (struct pppox_sock *)sk;
204}
205
206static inline struct sock *sk_pppox(struct pppox_sock *po)
207{
208 return (struct sock *)po;
209}
210
211struct module;
212
213struct pppox_proto {
214 int (*create)(struct net *net, struct socket *sock);
215 int (*ioctl)(struct socket *sock, unsigned int cmd,
216 unsigned long arg);
217 struct module *owner;
218};
219
220extern int register_pppox_proto(int proto_num, const struct pppox_proto *pp);
221extern void unregister_pppox_proto(int proto_num);
222extern void pppox_unbind_sock(struct sock *sk);/* delete ppp-channel binding */
223extern int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
224
225/* PPPoX socket states */
226enum {
227 PPPOX_NONE = 0, /* initial state */
228 PPPOX_CONNECTED = 1, /* connection established ==TCP_ESTABLISHED */
229 PPPOX_BOUND = 2, /* bound to ppp device */
230 PPPOX_RELAY = 4, /* forwarding is enabled */
231 PPPOX_ZOMBIE = 8, /* dead, but still bound to ppp device */
232 PPPOX_DEAD = 16 /* dead, useless, please clean me up!*/
233};
234
235#endif /* __KERNEL__ */
236
237#endif /* !(__LINUX_IF_PPPOX_H) */