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 */
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 * Protocols supported by AF_PPPOX
51 */
52 #define PX_PROTO_OE 0 /* Currently just PPPoE */
53 #define PX_PROTO_OL2TP 1 /* Now L2TP also */
54 #define PX_MAX_PROTO 2
55
56 struct sockaddr_pppox {
57 sa_family_t sa_family; /* address family, AF_PPPOX */
58 unsigned int sa_protocol; /* protocol identifier */
59 union{
60 struct pppoe_addr pppoe;
61 }sa_addr;
62 }__attribute__ ((packed));
63
64 /* The use of the above union isn't viable because the size of this
65 * struct must stay fixed over time -- applications use sizeof(struct
66 * sockaddr_pppox) to fill it. We use a protocol specific sockaddr
67 * type instead.
68 */
69 struct sockaddr_pppol2tp {
70 sa_family_t sa_family; /* address family, AF_PPPOX */
71 unsigned int sa_protocol; /* protocol identifier */
72 struct pppol2tp_addr pppol2tp;
73 }__attribute__ ((packed));
74
75 /*********************************************************************
76 *
77 * ioctl interface for defining forwarding of connections
78 *
79 ********************************************************************/
80
81 #define PPPOEIOCSFWD _IOW(0xB1 ,0, size_t)
82 #define PPPOEIOCDFWD _IO(0xB1 ,1)
83 /*#define PPPOEIOCGFWD _IOWR(0xB1,2, size_t)*/
84
85 /* Codes to identify message types */
86 #define PADI_CODE 0x09
87 #define PADO_CODE 0x07
88 #define PADR_CODE 0x19
89 #define PADS_CODE 0x65
90 #define PADT_CODE 0xa7
91 struct pppoe_tag {
92 __be16 tag_type;
93 __be16 tag_len;
94 char tag_data[0];
95 } __attribute ((packed));
96
97 /* Tag identifiers */
98 #define PTT_EOL __cpu_to_be16(0x0000)
99 #define PTT_SRV_NAME __cpu_to_be16(0x0101)
100 #define PTT_AC_NAME __cpu_to_be16(0x0102)
101 #define PTT_HOST_UNIQ __cpu_to_be16(0x0103)
102 #define PTT_AC_COOKIE __cpu_to_be16(0x0104)
103 #define PTT_VENDOR __cpu_to_be16(0x0105)
104 #define PTT_RELAY_SID __cpu_to_be16(0x0110)
105 #define PTT_SRV_ERR __cpu_to_be16(0x0201)
106 #define PTT_SYS_ERR __cpu_to_be16(0x0202)
107 #define PTT_GEN_ERR __cpu_to_be16(0x0203)
108
109 struct pppoe_hdr {
110 #if defined(__LITTLE_ENDIAN_BITFIELD)
111 __u8 ver : 4;
112 __u8 type : 4;
113 #elif defined(__BIG_ENDIAN_BITFIELD)
114 __u8 type : 4;
115 __u8 ver : 4;
116 #else
117 #error "Please fix <asm/byteorder.h>"
118 #endif
119 __u8 code;
120 __be16 sid;
121 __be16 length;
122 struct pppoe_tag tag[0];
123 } __attribute__ ((packed));
124
125 /* Length of entire PPPoE + PPP header */
126 #define PPPOE_SES_HLEN 8
127
128 #ifdef __KERNEL__
129 #include <linux/skbuff.h>
130
131 static inline struct pppoe_hdr *pppoe_hdr(const struct sk_buff *skb)
132 {
133 return (struct pppoe_hdr *)skb_network_header(skb);
134 }
135
136 struct pppoe_opt {
137 struct net_device *dev; /* device associated with socket*/
138 int ifindex; /* ifindex of device associated with socket */
139 struct pppoe_addr pa; /* what this socket is bound to*/
140 struct sockaddr_pppox relay; /* what socket data will be
141 relayed to (PPPoE relaying) */
142 };
143
144 #include <net/sock.h>
145
146 struct pppox_sock {
147 /* struct sock must be the first member of pppox_sock */
148 struct sock sk;
149 struct ppp_channel chan;
150 struct pppox_sock *next; /* for hash table */
151 union {
152 struct pppoe_opt pppoe;
153 } proto;
154 __be16 num;
155 };
156 #define pppoe_dev proto.pppoe.dev
157 #define pppoe_ifindex proto.pppoe.ifindex
158 #define pppoe_pa proto.pppoe.pa
159 #define pppoe_relay proto.pppoe.relay
160
161 static inline struct pppox_sock *pppox_sk(struct sock *sk)
162 {
163 return (struct pppox_sock *)sk;
164 }
165
166 static inline struct sock *sk_pppox(struct pppox_sock *po)
167 {
168 return (struct sock *)po;
169 }
170
171 struct module;
172
173 struct pppox_proto {
174 int (*create)(struct net *net, struct socket *sock);
175 int (*ioctl)(struct socket *sock, unsigned int cmd,
176 unsigned long arg);
177 struct module *owner;
178 };
179
180 extern int register_pppox_proto(int proto_num, struct pppox_proto *pp);
181 extern void unregister_pppox_proto(int proto_num);
182 extern void pppox_unbind_sock(struct sock *sk);/* delete ppp-channel binding */
183 extern int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
184
185 /* PPPoX socket states */
186 enum {
187 PPPOX_NONE = 0, /* initial state */
188 PPPOX_CONNECTED = 1, /* connection established ==TCP_ESTABLISHED */
189 PPPOX_BOUND = 2, /* bound to ppp device */
190 PPPOX_RELAY = 4, /* forwarding is enabled */
191 PPPOX_ZOMBIE = 8, /* dead, but still bound to ppp device */
192 PPPOX_DEAD = 16 /* dead, useless, please clean me up!*/
193 };
194
195 #endif /* __KERNEL__ */
196
197 #endif /* !(__LINUX_IF_PPPOX_H) */
198
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