release/src/router/ppp/pppoecd/pppoe.h

   1 /* PPPoE support library "libpppoe"
   2  *
   3  * Copyright 2000 Michal Ostrowski <mostrows@styx.uwaterloo.ca>,
   4  *                Jamal Hadi Salim <hadi@cyberus.ca>
   5  *
   6  *  This program is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU General Public License
   8  *  as published by the Free Software Foundation; either version
   9  *  2 of the License, or (at your option) any later version.
  10  */
  11
  12 #ifndef PPPOE_H
  13 #define PPPOE_H 1
  14 #include <stdio.h>              /* stdio               */
  15 #include <stdlib.h>             /* strtoul(), realloc() */
  16 #include <unistd.h>             /* STDIN_FILENO,exec    */
  17 #include <string.h>             /* memcpy()             */
  18 #include <errno.h>              /* errno                */
  19 #include <signal.h>
  20 #include <getopt.h>
  21 #include <stdarg.h>
  22 #include <syslog.h>
  23 #include <paths.h>
  24
  25 #include <sys/types.h>          /* socket types         */
  26 #include <asm/types.h>
  27 #include <sys/time.h>
  28 #include <sys/wait.h>
  29 #include <sys/fcntl.h>
  30 #include <sys/ioctl.h>          /* ioctl()              */
  31 #include <sys/select.h>
  32 #include <sys/socket.h>         /* socket()             */
  33 #include <net/if.h>             /* ifreq struct         */
  34 #include <net/if_arp.h>
  35 #include <netinet/in.h>
  36
  37 #if __GLIBC__ >= 2 && __GLIBC_MINOR >= 1
  38 #include <netpacket/packet.h>
  39 //#include <net/ethernet.h>
  40 #else
  41 #include <asm/types.h>
  42 #include <linux/if_packet.h>
  43 #include <linux/if_ether.h>
  44 #endif
  45
  46
  47 #include <asm/byteorder.h>
  48
  49 /*
  50   jamal: we really have to change this
  51   to make it compatible to the 2.2 and
  52   2.3 kernel
  53 */
  54
  55 #include <linux/if_pppox.h>
  56
  57 #include "pppd.h"
  58
  59 #define CONNECTED 1
  60 #define DISCONNECTED 0
  61
  62 #ifndef _PATH_PPPD
  63 #define _PATH_PPPD "/usr/sbin/pppd"
  64 #endif
  65
  66 #ifndef LOG_PPPOE
  67 #define LOG_PPPOE LOG_DAEMON
  68 #endif
  69
  70 #define VERSION_MAJOR 0
  71 #define VERSION_MINOR 4
  72 #define VERSION_DATE 991120
  73
  74 /* Bigger than the biggest ethernet packet we'll ever see, in bytes */
  75 #define MAX_PACKET      2000
  76
  77 /* references: RFC 2516 */
  78 /* ETHER_TYPE fields for PPPoE */
  79
  80 #define ETH_P_PPPOE_DISC 0x8863 /* discovery stage */
  81 #define ETH_P_PPPOE_SESS 0x8864
  82
  83 /* ethernet broadcast address */
  84 #define MAC_BCAST_ADDR "\xff\xff\xff\xff\xff\xff"
  85
  86 /* Format for parsing long device-name */
  87 #define _STR(x) #x
  88 #define FMTSTRING(size) "%x:%x:%x:%x:%x:%x/%x/%" _STR(size) "s"
  89
  90 /* maximum payload length */
  91 #define MAX_PAYLOAD 1484
  92
  93
  94
  95 /* PPPoE tag types */
  96 #define MAX_TAGS                11
  97
  98
  99 /* PPPoE packet; includes Ethernet headers and such */
 100 struct pppoe_packet{
 101         struct sockaddr_ll addr;
 102         struct pppoe_tag *tags[MAX_TAGS];
 103         struct pppoe_hdr *hdr;
 104         char buf[MAX_PAYLOAD];          /* buffer in which tags are held */
 105 };
 106 /* Defines meaning of each "tags" element */
 107
 108 #define TAG_SRV_NAME    0
 109 #define TAG_AC_NAME     1
 110 #define TAG_HOST_UNIQ   2
 111 #define TAG_AC_COOKIE   3
 112 #define TAG_VENDOR      4
 113 #define TAG_RELAY_SID   5
 114 #define TAG_SRV_ERR     6
 115 #define TAG_SYS_ERR     7
 116 #define TAG_GEN_ERR     8
 117 #define TAG_EOL         9
 118
 119 /*
 120 static int tag_map[] = { PTT_SRV_NAME,
 121                          PTT_AC_NAME,
 122                          PTT_HOST_UNIQ,
 123                          PTT_AC_COOKIE,
 124                          PTT_VENDOR,
 125                          PTT_RELAY_SID,
 126                          PTT_SRV_ERR,
 127                          PTT_SYS_ERR,
 128                          PTT_GEN_ERR,
 129                          PTT_EOL
 130 };
 131 */
 132
 133 /* Debug flags */
 134 int DEB_DISC,DEB_DISC2;
 135 /*
 136   #define DEB_DISC              (opt_debug & 0x0002)
 137   #define DEB_DISC2             (opt_debug & 0x0004)
 138 */
 139 #define MAX_FNAME               256
 140
 141
 142 struct session;
 143
 144 /* return <0 --> fatal error; abor
 145    return =0 --> ok, proceed
 146    return >0 --> ok, qui
 147 */
 148 typedef int (*packet_cb_t)(struct session* ses,
 149                            struct pppoe_packet *p_in,
 150                            struct pppoe_packet **p_out);
 151
 152 /* various override filter tags */
 153 struct filter {
 154         struct pppoe_tag *stag;  /* service name tag override */
 155         struct pppoe_tag *ntag;  /*AC name override */
 156         struct pppoe_tag *htag;  /* hostuniq override */
 157         int num_restart;
 158         int peermode;
 159         char *fname;
 160         char *pppd;
 161 } __attribute__ ((packed));
 162
 163
 164 struct pppoe_tag *make_filter_tag(short type, short length, char* data);
 165
 166 /* Session type definitions */
 167 #define SESSION_CLIENT  0
 168 #define SESSION_SERVER  1
 169 #define SESSION_RELAY   2
 170
 171 struct session {
 172
 173         /* Administrative */
 174         int type;
 175         int opt_debug;
 176         int detached;
 177         int np;
 178         int log_to_fd;
 179         int ifindex;                    /* index of device */
 180         char name[IFNAMSIZ];            /*dev name */
 181         struct pppoe_packet curr_pkt;
 182
 183         packet_cb_t init_disc;
 184         packet_cb_t rcv_pado;
 185         packet_cb_t rcv_padi;
 186         packet_cb_t rcv_pads;
 187         packet_cb_t rcv_padr;
 188         packet_cb_t rcv_padt;
 189         packet_cb_t timeout;
 190
 191
 192         /* Generic */
 193         struct filter *filt;
 194         struct sockaddr_ll local;
 195         struct sockaddr_ll remote;
 196         struct sockaddr_pppox sp;
 197         int fd;                         /* fd of PPPoE socket */
 198
 199
 200         /* For client */
 201         int retransmits;                /* Number of retransmission performed
 202                                            if < 0 , retransmissions disabled */
 203         int retries;
 204         int state;
 205         int opt_daemonize;
 206
 207         /* For server */
 208         int fork;
 209
 210         /* For forwarding */
 211         int fwd_sock;
 212         char fwd_name[IFNAMSIZ];        /* Name of device to forward to */
 213 } __attribute__ ((packed));
 214
 215 /*
 216   retransmit retries for the PADR and PADI packets
 217   during discovery
 218 */
 219 int PADR_ret;
 220 int PADI_ret;
 221
 222 int log_to_fd;
 223 int ctrl_fd;
 224 int opt_debug;
 225 int opt_daemonize;
 226
 227
 228 /* Structure for keeping track of connection relays */
 229 struct pppoe_con{
 230         struct pppoe_con *next;
 231         int id;
 232         int connected;
 233         int  cl_sock;
 234         int  sv_sock;
 235         int ref_count;
 236         char client[ETH_ALEN];
 237         char server[ETH_ALEN];
 238         char key_len;
 239         char key[32];
 240 };
 241
 242 /* Functions exported from utils.c. */
 243
 244 /* Functions exported from pppoehash.c */
 245 struct pppoe_con *get_con(int len, char *key);
 246 int store_con(struct pppoe_con *pc);
 247 struct pppoe_con *delete_con(unsigned long len, char *key);
 248
 249 /* exported by lib.c */
 250
 251 extern int init_lib();
 252
 253 extern int get_sockaddr_ll(const char *devnam,struct sockaddr_ll* sll);
 254
 255 extern int client_init_ses (struct session *ses, char* devnam);
 256 extern int relay_init_ses(struct session *ses, char* from, char* to);
 257 extern int srv_init_ses(struct session *ses, char* from);
 258 extern int session_connect(struct session *ses);
 259 extern int session_disconnect(struct session*ses);
 260
 261 extern int verify_packet( struct session *ses, struct pppoe_packet *p);
 262
 263 extern void copy_tag(struct pppoe_packet *dest, struct pppoe_tag *pt);
 264 extern struct pppoe_tag *get_tag(struct pppoe_hdr *ph, u_int16_t idx);
 265 extern int send_disc(struct session *ses, struct pppoe_packet *p);
 266
 267
 268 extern int add_client(char *addr);
 269
 270 /* Make connections (including spawning pppd) as server/client */
 271 extern int ppp_connect(struct session *ses);
 272
 273 #include <pppd.h>
 274
 275 #define poe_die die
 276
 277 //      #ifdef DEBUG
 278 #define poe_dbglog(ses,a,b...) dbglog(a, ## b)
 279 #define poe_info(ses,a,b...) info(a, ## b)
 280 #define poe_notice(ses,a,b...) notice(a, ## b)
 281 #define poe_warn(ses,a,b...) warn(a, ## b)
 282 #define poe_error(ses,a,b...) error(a, ## b)
 283 //      #define poe_fatal(ses,a,b...) fatal(a, ## b)
 284 #define poe_fatal(ses,a,b...) error(a, ## b)
 285 /*
 286 #else
 287 #define poe_dbglog(a,b...)
 288 #define poe_info(a,b...)
 289 #define poe_notice(a,b...)
 290 #define poe_warn(a,b...)
 291 #define poe_error(a,b...)
 292 #define poe_fatal(a,b...)
 293 #endif
 294 */
 295
 296 #endif