iwinfo_wext.c

   1 /*
   2  * iwinfo - Wireless Information Library - Linux Wireless Extension Backend
   3  *
   4  *   Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
   5  *
   6  * The iwinfo library is free software: you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  *
  10  * The iwinfo library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  * See the GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with the iwinfo library. If not, see http://www.gnu.org/licenses/.
  17  *
  18  * Parts of this code are derived from the Linux wireless tools, iwlib.c,
  19  * iwlist.c and iwconfig.c in particular.
  20  */
  21
  22 #include "iwinfo.h"
  23 #include "iwinfo_wext.h"
  24
  25 static double wext_freq2float(const struct iw_freq *in)
  26 {
  27         int             i;
  28         double  res = (double) in->m;
  29         for(i = 0; i < in->e; i++) res *= 10;
  30         return res;
  31 }
  32
  33 static inline int wext_freq2mhz(const struct iw_freq *in)
  34 {
  35         int i;
  36
  37         if( in->e == 6 )
  38         {
  39                 return in->m;
  40         }
  41         else
  42         {
  43                 return (int)(wext_freq2float(in) / 1000000);
  44         }
  45 }
  46
  47 static inline int wext_ioctl(const char *ifname, int cmd, struct iwreq *wrq)
  48 {
  49         if( !strncmp(ifname, "mon.", 4) )
  50                 strncpy(wrq->ifr_name, &ifname[4], IFNAMSIZ);
  51         else
  52                 strncpy(wrq->ifr_name, ifname, IFNAMSIZ);
  53
  54         return iwinfo_ioctl(cmd, wrq);
  55 }
  56
  57
  58 static int wext_probe(const char *ifname)
  59 {
  60         struct iwreq wrq;
  61
  62         if(wext_ioctl(ifname, SIOCGIWNAME, &wrq) >= 0)
  63                 return 1;
  64
  65         return 0;
  66 }
  67
  68 static void wext_close(void)
  69 {
  70         /* Nop */
  71 }
  72
  73 static int wext_get_mode(const char *ifname, int *buf)
  74 {
  75         struct iwreq wrq;
  76
  77         if(wext_ioctl(ifname, SIOCGIWMODE, &wrq) >= 0)
  78         {
  79                 switch(wrq.u.mode)
  80                 {
  81                         case 1:
  82                                 *buf = IWINFO_OPMODE_ADHOC;
  83                                 break;
  84
  85                         case 2:
  86                                 *buf = IWINFO_OPMODE_CLIENT;
  87                                 break;
  88
  89                         case 3:
  90                                 *buf = IWINFO_OPMODE_MASTER;
  91                                 break;
  92
  93                         case 6:
  94                                 *buf = IWINFO_OPMODE_MONITOR;
  95                                 break;
  96
  97                         default:
  98                                 *buf = IWINFO_OPMODE_UNKNOWN;
  99                                 break;
 100                 }
 101
 102                 return 0;
 103         }
 104
 105         return -1;
 106 }
 107
 108 static int wext_get_ssid(const char *ifname, char *buf)
 109 {
 110         struct iwreq wrq;
 111
 112         wrq.u.essid.pointer = (caddr_t) buf;
 113         wrq.u.essid.length  = IW_ESSID_MAX_SIZE + 1;
 114         wrq.u.essid.flags   = 0;
 115
 116         if(wext_ioctl(ifname, SIOCGIWESSID, &wrq) >= 0)
 117                 return 0;
 118
 119         return -1;
 120 }
 121
 122 static int wext_get_bssid(const char *ifname, char *buf)
 123 {
 124         struct iwreq wrq;
 125
 126         if(wext_ioctl(ifname, SIOCGIWAP, &wrq) >= 0)
 127         {
 128                 sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X",
 129                         (uint8_t)wrq.u.ap_addr.sa_data[0], (uint8_t)wrq.u.ap_addr.sa_data[1],
 130                         (uint8_t)wrq.u.ap_addr.sa_data[2], (uint8_t)wrq.u.ap_addr.sa_data[3],
 131                         (uint8_t)wrq.u.ap_addr.sa_data[4], (uint8_t)wrq.u.ap_addr.sa_data[5]);
 132
 133                 return 0;
 134         }
 135
 136         return -1;
 137 }
 138
 139 static int wext_get_bitrate(const char *ifname, int *buf)
 140 {
 141         struct iwreq wrq;
 142
 143         if(wext_ioctl(ifname, SIOCGIWRATE, &wrq) >= 0)
 144         {
 145                 *buf = (wrq.u.bitrate.value / 1000);
 146                 return 0;
 147         }
 148
 149         return -1;
 150 }
 151
 152 static int wext_get_channel(const char *ifname, int *buf)
 153 {
 154         struct iwreq wrq;
 155         struct iw_range range;
 156         double freq;
 157         int i;
 158
 159         if(wext_ioctl(ifname, SIOCGIWFREQ, &wrq) >= 0)
 160         {
 161                 if( wrq.u.freq.m >= 1000 )
 162                 {
 163                         freq = wext_freq2float(&wrq.u.freq);
 164                         wrq.u.data.pointer = (caddr_t) &range;
 165                         wrq.u.data.length  = sizeof(struct iw_range);
 166                         wrq.u.data.flags   = 0;
 167
 168                         if(wext_ioctl(ifname, SIOCGIWRANGE, &wrq) >= 0)
 169                         {
 170                                 for(i = 0; i < range.num_frequency; i++)
 171                                 {
 172                                         if( wext_freq2float(&range.freq[i]) == freq )
 173                                         {
 174                                                 *buf = range.freq[i].i;
 175                                                 return 0;
 176                                         }
 177                                 }
 178                         }
 179                 }
 180                 else
 181                 {
 182                         *buf = wrq.u.freq.m;
 183                         return 0;
 184                 }
 185         }
 186
 187         return -1;
 188 }
 189
 190 static int wext_get_frequency(const char *ifname, int *buf)
 191 {
 192         struct iwreq wrq;
 193         struct iw_range range;
 194         int i, channel;
 195
 196         if(wext_ioctl(ifname, SIOCGIWFREQ, &wrq) >= 0)
 197         {
 198                 /* We got a channel number instead ... */
 199                 if( wrq.u.freq.m < 1000 )
 200                 {
 201                         channel = wrq.u.freq.m;
 202                         wrq.u.data.pointer = (caddr_t) &range;
 203                         wrq.u.data.length  = sizeof(struct iw_range);
 204                         wrq.u.data.flags   = 0;
 205
 206                         if(wext_ioctl(ifname, SIOCGIWRANGE, &wrq) >= 0)
 207                         {
 208                                 for(i = 0; i < range.num_frequency; i++)
 209                                 {
 210                                         if( range.freq[i].i == channel )
 211                                         {
 212                                                 *buf = wext_freq2mhz(&range.freq[i]);
 213                                                 return 0;
 214                                         }
 215                                 }
 216                         }
 217                 }
 218                 else
 219                 {
 220                         *buf = wext_freq2mhz(&wrq.u.freq);
 221                         return 0;
 222                 }
 223         }
 224
 225         return -1;
 226 }
 227
 228 static int wext_get_txpower(const char *ifname, int *buf)
 229 {
 230         struct iwreq wrq;
 231
 232         wrq.u.txpower.flags = 0;
 233
 234         if(wext_ioctl(ifname, SIOCGIWTXPOW, &wrq) >= 0)
 235         {
 236                 if(wrq.u.txpower.flags & IW_TXPOW_MWATT)
 237                         *buf = iwinfo_mw2dbm(wrq.u.txpower.value);
 238                 else
 239                         *buf = wrq.u.txpower.value;
 240
 241                 return 0;
 242         }
 243
 244         return -1;
 245 }
 246
 247 static int wext_get_signal(const char *ifname, int *buf)
 248 {
 249         struct iwreq wrq;
 250         struct iw_statistics stats;
 251
 252         wrq.u.data.pointer = (caddr_t) &stats;
 253         wrq.u.data.length  = sizeof(struct iw_statistics);
 254         wrq.u.data.flags   = 1;
 255
 256         if(wext_ioctl(ifname, SIOCGIWSTATS, &wrq) >= 0)
 257         {
 258                 *buf = (stats.qual.updated & IW_QUAL_DBM)
 259                         ? (stats.qual.level - 0x100) : stats.qual.level;
 260
 261                 return 0;
 262         }
 263
 264         return -1;
 265 }
 266
 267 static int wext_get_noise(const char *ifname, int *buf)
 268 {
 269         struct iwreq wrq;
 270         struct iw_statistics stats;
 271
 272         wrq.u.data.pointer = (caddr_t) &stats;
 273         wrq.u.data.length  = sizeof(struct iw_statistics);
 274         wrq.u.data.flags   = 1;
 275
 276         if(wext_ioctl(ifname, SIOCGIWSTATS, &wrq) >= 0)
 277         {
 278                 *buf = (stats.qual.updated & IW_QUAL_DBM)
 279                         ? (stats.qual.noise - 0x100) : stats.qual.noise;
 280
 281                 return 0;
 282         }
 283
 284         return -1;
 285 }
 286
 287 static int wext_get_quality(const char *ifname, int *buf)
 288 {
 289         struct iwreq wrq;
 290         struct iw_statistics stats;
 291
 292         wrq.u.data.pointer = (caddr_t) &stats;
 293         wrq.u.data.length  = sizeof(struct iw_statistics);
 294         wrq.u.data.flags   = 1;
 295
 296         if(wext_ioctl(ifname, SIOCGIWSTATS, &wrq) >= 0)
 297         {
 298                 *buf = stats.qual.qual;
 299                 return 0;
 300         }
 301
 302         return -1;
 303 }
 304
 305 static int wext_get_quality_max(const char *ifname, int *buf)
 306 {
 307         struct iwreq wrq;
 308         struct iw_range range;
 309
 310         wrq.u.data.pointer = (caddr_t) &range;
 311         wrq.u.data.length  = sizeof(struct iw_range);
 312         wrq.u.data.flags   = 0;
 313
 314         if(wext_ioctl(ifname, SIOCGIWRANGE, &wrq) >= 0)
 315         {
 316                 *buf = range.max_qual.qual;
 317                 return 0;
 318         }
 319
 320         return -1;
 321 }
 322
 323 static int wext_get_assoclist(const char *ifname, char *buf, int *len)
 324 {
 325         /* Stub */
 326         return -1;
 327 }
 328
 329 static int wext_get_txpwrlist(const char *ifname, char *buf, int *len)
 330 {
 331         struct iwreq wrq;
 332         struct iw_range range;
 333         struct iwinfo_txpwrlist_entry entry;
 334         int i;
 335
 336         wrq.u.data.pointer = (caddr_t) &range;
 337         wrq.u.data.length  = sizeof(struct iw_range);
 338         wrq.u.data.flags   = 0;
 339
 340         if( (wext_ioctl(ifname, SIOCGIWRANGE, &wrq) >= 0) &&
 341             (range.num_txpower > 0) && (range.num_txpower <= IW_MAX_TXPOWER) &&
 342             !(range.txpower_capa & IW_TXPOW_RELATIVE)
 343         ) {
 344                 for( i = 0; i < range.num_txpower; i++ )
 345                 {
 346                         if( range.txpower_capa & IW_TXPOW_MWATT )
 347                         {
 348                                 entry.dbm = iwinfo_mw2dbm(range.txpower[i]);
 349                                 entry.mw  = range.txpower[i];
 350                         }
 351
 352                         /* Madwifi does neither set mW not dBm caps, also iwlist assumes
 353                          * dBm if mW is not set, so don't check here... */
 354                         else /* if( range.txpower_capa & IW_TXPOW_DBM ) */
 355                         {
 356                                 entry.dbm = range.txpower[i];
 357                                 entry.mw  = iwinfo_dbm2mw(range.txpower[i]);
 358                         }
 359
 360                         memcpy(&buf[i*sizeof(entry)], &entry, sizeof(entry));
 361                 }
 362
 363                 *len = i * sizeof(entry);
 364                 return 0;
 365         }
 366
 367         return -1;
 368 }
 369
 370 static int wext_get_freqlist(const char *ifname, char *buf, int *len)
 371 {
 372         struct iwreq wrq;
 373         struct iw_range range;
 374         struct iwinfo_freqlist_entry entry;
 375         int i, bl;
 376
 377         wrq.u.data.pointer = (caddr_t) &range;
 378         wrq.u.data.length  = sizeof(struct iw_range);
 379         wrq.u.data.flags   = 0;
 380
 381         if(wext_ioctl(ifname, SIOCGIWRANGE, &wrq) >= 0)
 382         {
 383                 bl = 0;
 384
 385                 for(i = 0; i < range.num_frequency; i++)
 386                 {
 387                         entry.mhz        = wext_freq2mhz(&range.freq[i]);
 388                         entry.channel    = range.freq[i].i;
 389                         entry.restricted = 0;
 390
 391                         memcpy(&buf[bl], &entry, sizeof(struct iwinfo_freqlist_entry));
 392                         bl += sizeof(struct iwinfo_freqlist_entry);
 393                 }
 394
 395                 *len = bl;
 396                 return 0;
 397         }
 398
 399         return -1;
 400 }
 401
 402 static int wext_get_country(const char *ifname, char *buf)
 403 {
 404         sprintf(buf, "00");
 405         return 0;
 406 }
 407
 408 static int wext_get_countrylist(const char *ifname, char *buf, int *len)
 409 {
 410         /* Stub */
 411         return -1;
 412 }
 413
 414 static int wext_get_hwmodelist(const char *ifname, int *buf)
 415 {
 416         char chans[IWINFO_BUFSIZE] = { 0 };
 417         struct iwinfo_freqlist_entry *e = NULL;
 418         int len = 0;
 419
 420         *buf = 0;
 421
 422         if( !wext_get_freqlist(ifname, chans, &len) )
 423         {
 424                 for( e = (struct iwinfo_freqlist_entry *)chans; e->channel; e++ )
 425                 {
 426                         if( e->channel <= 14 )
 427                         {
 428                                 *buf |= IWINFO_80211_B;
 429                                 *buf |= IWINFO_80211_G;
 430                         }
 431                         else
 432                         {
 433                                 *buf |= IWINFO_80211_A;
 434                         }
 435                 }
 436
 437                 return 0;
 438         }
 439
 440         return -1;
 441 }
 442
 443 static int wext_get_encryption(const char *ifname, char *buf)
 444 {
 445         /* No reliable crypto info in wext */
 446         return -1;
 447 }
 448
 449 static int wext_get_phyname(const char *ifname, char *buf)
 450 {
 451         /* No suitable api in wext */
 452         strcpy(buf, ifname);
 453         return 0;
 454 }
 455
 456 static int wext_get_mbssid_support(const char *ifname, int *buf)
 457 {
 458         /* No multi bssid support atm */
 459         return -1;
 460 }
 461
 462 static char * wext_sysfs_ifname_file(const char *ifname, const char *path)
 463 {
 464         FILE *f;
 465         static char buf[128];
 466         char *rv = NULL;
 467
 468         snprintf(buf, sizeof(buf), "/sys/class/net/%s/%s", ifname, path);
 469
 470         if ((f = fopen(buf, "r")) != NULL)
 471         {
 472                 memset(buf, 0, sizeof(buf));
 473
 474                 if (fread(buf, 1, sizeof(buf), f))
 475                         rv = buf;
 476
 477                 fclose(f);
 478         }
 479
 480         return rv;
 481 }
 482
 483 static int wext_get_hardware_id(const char *ifname, char *buf)
 484 {
 485         char *data;
 486         struct iwinfo_hardware_id *id = (struct iwinfo_hardware_id *)buf;
 487
 488         memset(id, 0, sizeof(struct iwinfo_hardware_id));
 489
 490         data = wext_sysfs_ifname_file(ifname, "device/vendor");
 491         if (data)
 492                 id->vendor_id = strtoul(data, NULL, 16);
 493
 494         data = wext_sysfs_ifname_file(ifname, "device/device");
 495         if (data)
 496                 id->device_id = strtoul(data, NULL, 16);
 497
 498         data = wext_sysfs_ifname_file(ifname, "device/subsystem_device");
 499         if (data)
 500                 id->subsystem_device_id = strtoul(data, NULL, 16);
 501
 502         data = wext_sysfs_ifname_file(ifname, "device/subsystem_vendor");
 503         if (data)
 504                 id->subsystem_vendor_id = strtoul(data, NULL, 16);
 505
 506         return (id->vendor_id > 0 && id->device_id > 0) ? 0 : -1;
 507 }
 508
 509 static int wext_get_hardware_name(const char *ifname, char *buf)
 510 {
 511         sprintf(buf, "Generic WEXT");
 512         return 0;
 513 }
 514
 515 static int wext_get_txpower_offset(const char *ifname, int *buf)
 516 {
 517         /* Stub */
 518         *buf = 0;
 519         return -1;
 520 }
 521
 522 static int wext_get_frequency_offset(const char *ifname, int *buf)
 523 {
 524         /* Stub */
 525         *buf = 0;
 526         return -1;
 527 }
 528
 529 const struct iwinfo_ops wext_ops = {
 530         .name             = "wext",
 531         .probe            = wext_probe,
 532         .channel          = wext_get_channel,
 533         .frequency        = wext_get_frequency,
 534         .frequency_offset = wext_get_frequency_offset,
 535         .txpower          = wext_get_txpower,
 536         .txpower_offset   = wext_get_txpower_offset,
 537         .bitrate          = wext_get_bitrate,
 538         .signal           = wext_get_signal,
 539         .noise            = wext_get_noise,
 540         .quality          = wext_get_quality,
 541         .quality_max      = wext_get_quality_max,
 542         .mbssid_support   = wext_get_mbssid_support,
 543         .hwmodelist       = wext_get_hwmodelist,
 544         .mode             = wext_get_mode,
 545         .ssid             = wext_get_ssid,
 546         .bssid            = wext_get_bssid,
 547         .country          = wext_get_country,
 548         .hardware_id      = wext_get_hardware_id,
 549         .hardware_name    = wext_get_hardware_name,
 550         .encryption       = wext_get_encryption,
 551         .phyname          = wext_get_phyname,
 552         .assoclist        = wext_get_assoclist,
 553         .txpwrlist        = wext_get_txpwrlist,
 554         .scanlist         = wext_get_scanlist,
 555         .freqlist         = wext_get_freqlist,
 556         .countrylist      = wext_get_countrylist,
 557         .close            = wext_close
 558 };