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 */ 43 typedef __be16 sid_t; 44 struct 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 */ 53 struct 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 66 struct 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 } __attribute__((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 */ 80 struct 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 } __attribute__((packed)); 85 86 /* The L2TPv3 protocol changes tunnel and session ids from 16 to 32 87 * bits. So we need a different sockaddr structure. 88 */ 89 struct sockaddr_pppol2tpv3 { 90 __kernel_sa_family_t sa_family; /* address family, AF_PPPOX */ 91 unsigned int sa_protocol; /* protocol identifier */ 92 struct pppol2tpv3_addr pppol2tp; 93 } __attribute__((packed)); 94 95 /********************************************************************* 96 * 97 * ioctl interface for defining forwarding of connections 98 * 99 ********************************************************************/ 100 101 #define PPPOEIOCSFWD _IOW(0xB1 ,0, size_t) 102 #define PPPOEIOCDFWD _IO(0xB1 ,1) 103 /*#define PPPOEIOCGFWD _IOWR(0xB1,2, size_t)*/ 104 105 /* Codes to identify message types */ 106 #define PADI_CODE 0x09 107 #define PADO_CODE 0x07 108 #define PADR_CODE 0x19 109 #define PADS_CODE 0x65 110 #define PADT_CODE 0xa7 111 struct pppoe_tag { 112 __be16 tag_type; 113 __be16 tag_len; 114 char tag_data[0]; 115 } __attribute__ ((packed)); 116 117 /* Tag identifiers */ 118 #define PTT_EOL __cpu_to_be16(0x0000) 119 #define PTT_SRV_NAME __cpu_to_be16(0x0101) 120 #define PTT_AC_NAME __cpu_to_be16(0x0102) 121 #define PTT_HOST_UNIQ __cpu_to_be16(0x0103) 122 #define PTT_AC_COOKIE __cpu_to_be16(0x0104) 123 #define PTT_VENDOR __cpu_to_be16(0x0105) 124 #define PTT_RELAY_SID __cpu_to_be16(0x0110) 125 #define PTT_SRV_ERR __cpu_to_be16(0x0201) 126 #define PTT_SYS_ERR __cpu_to_be16(0x0202) 127 #define PTT_GEN_ERR __cpu_to_be16(0x0203) 128 129 struct pppoe_hdr { 130 #if defined(__LITTLE_ENDIAN_BITFIELD) 131 __u8 ver : 4; 132 __u8 type : 4; 133 #elif defined(__BIG_ENDIAN_BITFIELD) 134 __u8 type : 4; 135 __u8 ver : 4; 136 #else 137 #error "Please fix <asm/byteorder.h>" 138 #endif 139 __u8 code; 140 __be16 sid; 141 __be16 length; 142 struct pppoe_tag tag[0]; 143 } __attribute__((packed)); 144 145 /* Length of entire PPPoE + PPP header */ 146 #define PPPOE_SES_HLEN 8 147 148 #ifdef __KERNEL__ 149 #include <linux/skbuff.h> 150 151 static inline struct pppoe_hdr *pppoe_hdr(const struct sk_buff *skb) 152 { 153 return (struct pppoe_hdr *)skb_network_header(skb); 154 } 155 156 struct pppoe_opt { 157 struct net_device *dev; /* device associated with socket*/ 158 int ifindex; /* ifindex of device associated with socket */ 159 struct pppoe_addr pa; /* what this socket is bound to*/ 160 struct sockaddr_pppox relay; /* what socket data will be 161 relayed to (PPPoE relaying) */ 162 }; 163 164 struct pptp_opt { 165 struct pptp_addr src_addr; 166 struct pptp_addr dst_addr; 167 u32 ack_sent, ack_recv; 168 u32 seq_sent, seq_recv; 169 int ppp_flags; 170 }; 171 #include <net/sock.h> 172 173 struct pppox_sock { 174 /* struct sock must be the first member of pppox_sock */ 175 struct sock sk; 176 struct ppp_channel chan; 177 struct pppox_sock *next; /* for hash table */ 178 union { 179 struct pppoe_opt pppoe; 180 struct pptp_opt pptp; 181 } proto; 182 __be16 num; 183 }; 184 #define pppoe_dev proto.pppoe.dev 185 #define pppoe_ifindex proto.pppoe.ifindex 186 #define pppoe_pa proto.pppoe.pa 187 #define pppoe_relay proto.pppoe.relay 188 189 static inline struct pppox_sock *pppox_sk(struct sock *sk) 190 { 191 return (struct pppox_sock *)sk; 192 } 193 194 static inline struct sock *sk_pppox(struct pppox_sock *po) 195 { 196 return (struct sock *)po; 197 } 198 199 struct module; 200 201 struct pppox_proto { 202 int (*create)(struct net *net, struct socket *sock); 203 int (*ioctl)(struct socket *sock, unsigned int cmd, 204 unsigned long arg); 205 struct module *owner; 206 }; 207 208 extern int register_pppox_proto(int proto_num, const struct pppox_proto *pp); 209 extern void unregister_pppox_proto(int proto_num); 210 extern void pppox_unbind_sock(struct sock *sk);/* delete ppp-channel binding */ 211 extern int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 212 213 /* PPPoX socket states */ 214 enum { 215 PPPOX_NONE = 0, /* initial state */ 216 PPPOX_CONNECTED = 1, /* connection established ==TCP_ESTABLISHED */ 217 PPPOX_BOUND = 2, /* bound to ppp device */ 218 PPPOX_RELAY = 4, /* forwarding is enabled */ 219 PPPOX_ZOMBIE = 8, /* dead, but still bound to ppp device */ 220 PPPOX_DEAD = 16 /* dead, useless, please clean me up!*/ 221 }; 222 223 #endif /* __KERNEL__ */ 224 225 #endif /* !(__LINUX_IF_PPPOX_H) */ 226