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 } __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 } __packed; 85 86 struct 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 */ 95 struct 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; 100 101 struct 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 123 struct 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) 140 141 struct 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> 162 163 static inline struct pppoe_hdr *pppoe_hdr(const struct sk_buff *skb) 164 { 165 return (struct pppoe_hdr *)skb_network_header(skb); 166 } 167 168 struct 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 }; 175 176 struct 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> 184 185 struct 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 200 201 static inline struct pppox_sock *pppox_sk(struct sock *sk) 202 { 203 return (struct pppox_sock *)sk; 204 } 205 206 static inline struct sock *sk_pppox(struct pppox_sock *po) 207 { 208 return (struct sock *)po; 209 } 210 211 struct module; 212 213 struct 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 }; 219 220 extern int register_pppox_proto(int proto_num, const struct pppox_proto *pp); 221 extern void unregister_pppox_proto(int proto_num); 222 extern void pppox_unbind_sock(struct sock *sk);/* delete ppp-channel binding */ 223 extern int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 224 225 /* PPPoX socket states */ 226 enum { 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) */ 238