contrib/package/iwinfo/src/iwinfo_madwifi.c

   1 /*
   2  * iwinfo - Wireless Information Library - Madwifi 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  * The signal handling code is derived from the official madwifi tools,
  19  * wlanconfig.c in particular. The encryption property handling was
  20  * inspired by the hostapd madwifi driver.
  21  */
  22
  23 #include "iwinfo_madwifi.h"
  24 #include "iwinfo_wext.h"
  25
  26 static int ioctl_socket = -1;
  27
  28 static int madwifi_ioctl(struct iwreq *wrq, const char *ifname, int cmd, void *data, size_t len)
  29 {
  30         /* prepare socket */
  31         if( ioctl_socket == -1 )
  32                 ioctl_socket = socket(AF_INET, SOCK_DGRAM, 0);
  33
  34         strncpy(wrq->ifr_name, ifname, IFNAMSIZ);
  35
  36         if( data != NULL )
  37         {
  38                 if( len < IFNAMSIZ )
  39                 {
  40                         memcpy(wrq->u.name, data, len);
  41                 }
  42                 else
  43                 {
  44                         wrq->u.data.pointer = data;
  45                         wrq->u.data.length = len;
  46                 }
  47         }
  48
  49         return ioctl(ioctl_socket, cmd, wrq);
  50 }
  51
  52 static int get80211priv(const char *ifname, int op, void *data, size_t len)
  53 {
  54         struct iwreq iwr;
  55
  56         if( madwifi_ioctl(&iwr, ifname, op, data, len) < 0 )
  57                 return -1;
  58
  59         return iwr.u.data.length;
  60 }
  61
  62 static int madwifi_isvap(const char *ifname, const char *wifiname)
  63 {
  64         int fd, ret;
  65         char path[32];
  66         char name[IFNAMSIZ];
  67
  68         ret = 0;
  69
  70         if( strlen(ifname) <= 9 )
  71         {
  72                 sprintf(path, "/proc/sys/net/%s/%%parent", ifname);
  73
  74                 if( (fd = open(path, O_RDONLY)) > -1 )
  75                 {
  76                         if( wifiname != NULL )
  77                         {
  78                                 if( read(fd, name, strlen(wifiname)) == strlen(wifiname) )
  79                                         ret = strncmp(name, wifiname, strlen(wifiname)) ? 0 : 1;
  80                         }
  81                         else if( read(fd, name, 4) == 4 )
  82                         {
  83                                 ret = strncmp(name, "wifi", 4) ? 0 : 1;
  84                         }
  85
  86                         (void) close(fd);
  87                 }
  88         }
  89
  90         return ret;
  91 }
  92
  93 static int madwifi_iswifi(const char *ifname)
  94 {
  95         int ret;
  96         char path[32];
  97         struct stat s;
  98
  99         ret = 0;
 100
 101         if( strlen(ifname) <= 7 )
 102         {
 103                 sprintf(path, "/proc/sys/dev/%s/diversity", ifname);
 104
 105                 if( ! stat(path, &s) )
 106                         ret = (s.st_mode & S_IFREG);
 107         }
 108
 109         return ret;
 110 }
 111
 112
 113 int madwifi_probe(const char *ifname)
 114 {
 115         return ( madwifi_isvap(ifname, NULL) || madwifi_iswifi(ifname) );
 116 }
 117
 118 int madwifi_get_mode(const char *ifname, char *buf)
 119 {
 120         return wext_get_mode(ifname, buf);
 121 }
 122
 123 int madwifi_get_ssid(const char *ifname, char *buf)
 124 {
 125         return wext_get_ssid(ifname, buf);
 126 }
 127
 128 int madwifi_get_bssid(const char *ifname, char *buf)
 129 {
 130         return wext_get_bssid(ifname, buf);
 131 }
 132
 133 int madwifi_get_channel(const char *ifname, int *buf)
 134 {
 135         int i;
 136         uint16_t freq;
 137         struct iwreq wrq;
 138         struct ieee80211req_chaninfo chans;
 139
 140         if( madwifi_ioctl(&wrq, ifname, SIOCGIWFREQ, NULL, 0) >= 0 )
 141         {
 142                 /* Madwifi returns a Hz frequency, get it's freq list to find channel index */
 143                 freq = (uint16_t)(wrq.u.freq.m / 100000);
 144
 145                 if( get80211priv(ifname, IEEE80211_IOCTL_GETCHANINFO, &chans, sizeof(chans)) >= 0 )
 146                 {
 147                         *buf = 0;
 148
 149                         for( i = 0; i < chans.ic_nchans; i++ )
 150                         {
 151                                 if( freq == chans.ic_chans[i].ic_freq )
 152                                 {
 153                                         *buf = chans.ic_chans[i].ic_ieee;
 154                                         break;
 155                                 }
 156                         }
 157
 158                         return 0;
 159                 }
 160         }
 161
 162         return -1;
 163 }
 164
 165 int madwifi_get_frequency(const char *ifname, int *buf)
 166 {
 167         struct iwreq wrq;
 168
 169         if( madwifi_ioctl(&wrq, ifname, SIOCGIWFREQ, NULL, 0) >= 0 )
 170         {
 171                 *buf = (uint16_t)(wrq.u.freq.m / 100000);
 172                 return 0;
 173         }
 174
 175         return -1;
 176 }
 177
 178 int madwifi_get_txpower(const char *ifname, int *buf)
 179 {
 180         return wext_get_txpower(ifname, buf);
 181 }
 182
 183 int madwifi_get_bitrate(const char *ifname, int *buf)
 184 {
 185         unsigned int mode, len, rate, rate_count;
 186         uint8_t tmp[24*1024];
 187         uint8_t *cp;
 188         struct iwreq wrq;
 189         struct ieee80211req_sta_info *si;
 190
 191         if( madwifi_ioctl(&wrq, ifname, SIOCGIWMODE, NULL, 0) >= 0 )
 192         {
 193                 mode = wrq.u.mode;
 194
 195                 /* Calculate bitrate average from associated stations in ad-hoc mode */
 196                 if( mode == 1 )
 197                 {
 198                         rate = rate_count = 0;
 199
 200                         if( (len = get80211priv(ifname, IEEE80211_IOCTL_STA_INFO, tmp, 24*1024)) > 0 )
 201                         {
 202                                 cp = tmp;
 203
 204                                 do {
 205                                         si = (struct ieee80211req_sta_info *) cp;
 206
 207                                         if( si->isi_rssi > 0 )
 208                                         {
 209                                                 rate_count++;
 210                                                 rate += ((si->isi_rates[si->isi_txrate] & IEEE80211_RATE_VAL) / 2);
 211                                         }
 212
 213                                         cp   += si->isi_len;
 214                                         len  -= si->isi_len;
 215                                 } while (len >= sizeof(struct ieee80211req_sta_info));
 216                         }
 217
 218                         *buf = (rate == 0 || rate_count == 0) ? 0 : (rate / rate_count) * 1000;
 219                         return 0;
 220                 }
 221
 222                 /* Return whatever wext tells us ... */
 223                 return wext_get_bitrate(ifname, buf);
 224         }
 225
 226         return -1;
 227 }
 228
 229 int madwifi_get_signal(const char *ifname, int *buf)
 230 {
 231         unsigned int mode, len, rssi, rssi_count;
 232         uint8_t tmp[24*1024];
 233         uint8_t *cp;
 234         struct iwreq wrq;
 235         struct ieee80211req_sta_info *si;
 236
 237         if( madwifi_ioctl(&wrq, ifname, SIOCGIWMODE, NULL, 0) >= 0 )
 238         {
 239                 mode = wrq.u.mode;
 240
 241                 /* Calculate signal average from associated stations in ap or ad-hoc mode */
 242                 if( mode == 1 )
 243                 {
 244                         rssi = rssi_count = 0;
 245
 246                         if( (len = get80211priv(ifname, IEEE80211_IOCTL_STA_INFO, tmp, 24*1024)) > 0 )
 247                         {
 248                                 cp = tmp;
 249
 250                                 do {
 251                                         si = (struct ieee80211req_sta_info *) cp;
 252
 253                                         if( si->isi_rssi > 0 )
 254                                         {
 255                                                 rssi_count++;
 256                                                 rssi -= (si->isi_rssi - 95);
 257                                         }
 258
 259                                         cp   += si->isi_len;
 260                                         len  -= si->isi_len;
 261                                 } while (len >= sizeof(struct ieee80211req_sta_info));
 262                         }
 263
 264                         *buf = (rssi == 0 || rssi_count == 0) ? 1 : -(rssi / rssi_count);
 265                         return 0;
 266                 }
 267
 268                 /* Return whatever wext tells us ... */
 269                 return wext_get_signal(ifname, buf);
 270         }
 271
 272         return -1;
 273 }
 274
 275 int madwifi_get_noise(const char *ifname, int *buf)
 276 {
 277         return wext_get_noise(ifname, buf);
 278 }
 279
 280 int madwifi_get_quality(const char *ifname, int *buf)
 281 {
 282         unsigned int mode, len, quality, quality_count;
 283         uint8_t tmp[24*1024];
 284         uint8_t *cp;
 285         struct iwreq wrq;
 286         struct ieee80211req_sta_info *si;
 287
 288         if( madwifi_ioctl(&wrq, ifname, SIOCGIWMODE, NULL, 0) >= 0 )
 289         {
 290                 mode = wrq.u.mode;
 291
 292                 /* Calculate signal average from associated stations in ad-hoc mode */
 293                 if( mode == 1 )
 294                 {
 295                         quality = quality_count = 0;
 296
 297                         if( (len = get80211priv(ifname, IEEE80211_IOCTL_STA_INFO, tmp, 24*1024)) > 0 )
 298                         {
 299                                 cp = tmp;
 300
 301                                 do {
 302                                         si = (struct ieee80211req_sta_info *) cp;
 303
 304                                         if( si->isi_rssi > 0 )
 305                                         {
 306                                                 quality_count++;
 307                                                 quality += si->isi_rssi;
 308                                         }
 309
 310                                         cp   += si->isi_len;
 311                                         len  -= si->isi_len;
 312                                 } while (len >= sizeof(struct ieee80211req_sta_info));
 313                         }
 314
 315                         *buf = (quality == 0 || quality_count == 0) ? 0 : (quality / quality_count);
 316                         return 0;
 317                 }
 318
 319                 /* Return whatever wext tells us ... */
 320                 return wext_get_quality(ifname, buf);
 321         }
 322
 323         return -1;
 324 }
 325
 326 int madwifi_get_quality_max(const char *ifname, int *buf)
 327 {
 328         return wext_get_quality_max(ifname, buf);
 329 }
 330
 331 int madwifi_get_encryption(const char *ifname, char *buf)
 332 {
 333         int ciphers = 0, key_type = 0, key_len = 0;
 334         struct iwinfo_crypto_entry *c = (struct iwinfo_crypto_entry *)buf;
 335         struct iwreq wrq;
 336         struct ieee80211req_key wk;
 337
 338         memset(&wrq, 0, sizeof(wrq));
 339         memset(&wk, 0, sizeof(wk));
 340         memset(wk.ik_macaddr, 0xff, IEEE80211_ADDR_LEN);
 341
 342         /* Get key information */
 343         if( get80211priv(ifname, IEEE80211_IOCTL_GETKEY, &wk, sizeof(wk)) >= 0 )
 344         {
 345                 key_type = wk.ik_type;
 346
 347                 /* Type 0 == WEP */
 348                 if( key_type == 0 )
 349                         c->auth_algs = (IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED);
 350         }
 351
 352         /* Get wpa protocol version */
 353         wrq.u.mode = IEEE80211_PARAM_WPA;
 354         if( madwifi_ioctl(&wrq, ifname, IEEE80211_IOCTL_GETPARAM, NULL, 0) >= 0 )
 355                 c->wpa_version = wrq.u.mode;
 356
 357         /* Get authentication suites */
 358         wrq.u.mode = IEEE80211_PARAM_AUTHMODE;
 359         if( madwifi_ioctl(&wrq, ifname, IEEE80211_IOCTL_GETPARAM, NULL, 0) >= 0 )
 360         {
 361                 switch(wrq.u.mode) {
 362                         case IEEE80211_AUTH_8021X:
 363                                 c->auth_suites |= IWINFO_KMGMT_8021x;
 364                                 break;
 365
 366                         case IEEE80211_AUTH_WPA:
 367                                 c->auth_suites |= IWINFO_KMGMT_PSK;
 368                                 break;
 369
 370                         default:
 371                                 c->auth_suites |= IWINFO_KMGMT_NONE;
 372                                 break;
 373                 }
 374         }
 375
 376         /* Get group key length */
 377         wrq.u.mode = IEEE80211_PARAM_MCASTKEYLEN;
 378         if( madwifi_ioctl(&wrq, ifname, IEEE80211_IOCTL_GETPARAM, NULL, 0) >= 0 )
 379                 key_len = wrq.u.mode;
 380
 381         /* Get used pairwise ciphers */
 382         wrq.u.mode = IEEE80211_PARAM_UCASTCIPHERS;
 383         if( madwifi_ioctl(&wrq, ifname, IEEE80211_IOCTL_GETPARAM, NULL, 0) >= 0 )
 384         {
 385                 ciphers = wrq.u.mode;
 386
 387                 if( ciphers & (1 << IEEE80211_CIPHER_TKIP) )
 388                         c->pair_ciphers |= IWINFO_CIPHER_TKIP;
 389
 390                 if( ciphers & (1 << IEEE80211_CIPHER_AES_CCM) )
 391                         c->pair_ciphers |= IWINFO_CIPHER_CCMP;
 392
 393                 if( ciphers & (1 << IEEE80211_CIPHER_AES_OCB) )
 394                         c->pair_ciphers |= IWINFO_CIPHER_AESOCB;
 395
 396                 if( ciphers & (1 << IEEE80211_CIPHER_CKIP) )
 397                         c->pair_ciphers |= IWINFO_CIPHER_CKIP;
 398
 399                 if( ciphers & (1 << IEEE80211_CIPHER_WEP) )
 400                 {
 401                         switch(key_len) {
 402                                 case 13:
 403                                         c->pair_ciphers |= IWINFO_CIPHER_WEP104;
 404                                         break;
 405
 406                                 case 5:
 407                                         c->pair_ciphers |= IWINFO_CIPHER_WEP40;
 408                                         break;
 409
 410                                 default:
 411                                         break;
 412                         }
 413                 }
 414
 415                 if( ciphers & (1 << IEEE80211_CIPHER_NONE) )
 416                         c->pair_ciphers |= IWINFO_CIPHER_NONE;
 417         }
 418
 419         /* Get used group cipher */
 420         wrq.u.mode = IEEE80211_PARAM_MCASTCIPHER;
 421         if( madwifi_ioctl(&wrq, ifname, IEEE80211_IOCTL_GETPARAM, NULL, 0) >= 0 )
 422         {
 423                 ciphers = wrq.u.mode;
 424
 425                 switch(wrq.u.mode) {
 426                         case IEEE80211_CIPHER_TKIP:
 427                                 c->group_ciphers |= IWINFO_CIPHER_TKIP;
 428                                 break;
 429
 430                         case IEEE80211_CIPHER_AES_CCM:
 431                                 c->group_ciphers |= IWINFO_CIPHER_CCMP;
 432                                 break;
 433
 434                         case IEEE80211_CIPHER_AES_OCB:
 435                                 c->group_ciphers |= IWINFO_CIPHER_AESOCB;
 436                                 break;
 437
 438                         case IEEE80211_CIPHER_CKIP:
 439                                 c->group_ciphers |= IWINFO_CIPHER_CKIP;
 440                                 break;
 441
 442                         case IEEE80211_CIPHER_WEP:
 443                                 switch(key_len) {
 444                                         case 13:
 445                                                 c->group_ciphers |= IWINFO_CIPHER_WEP104;
 446                                                 break;
 447
 448                                         case 5:
 449                                                 c->group_ciphers |= IWINFO_CIPHER_WEP40;
 450                                                 break;
 451
 452                                         default:
 453                                                 break;
 454                                 }
 455                                 break;
 456
 457                         case IEEE80211_CIPHER_NONE:
 458                                 c->group_ciphers |= IWINFO_CIPHER_NONE;
 459                                 break;
 460
 461                         default:
 462                                 break;
 463                 }
 464         }
 465
 466         c->enabled = (c->wpa_version || c->auth_algs) ? 1 : 0;
 467
 468         return 0;
 469 }
 470
 471 int madwifi_get_assoclist(const char *ifname, char *buf, int *len)
 472 {
 473         int bl, tl, noise;
 474         uint8_t *cp;
 475         uint8_t tmp[24*1024];
 476         struct ieee80211req_sta_info *si;
 477         struct iwinfo_assoclist_entry entry;
 478
 479         if( (tl = get80211priv(ifname, IEEE80211_IOCTL_STA_INFO, tmp, 24*1024)) > 0 )
 480         {
 481                 cp = tmp;
 482                 bl = 0;
 483
 484                 if( madwifi_get_noise(ifname, &noise) )
 485                         noise = 0;
 486
 487                 do {
 488                         si = (struct ieee80211req_sta_info *) cp;
 489
 490                         entry.signal = (si->isi_rssi - 95);
 491                         entry.noise  = noise;
 492                         memcpy(entry.mac, &si->isi_macaddr, 6);
 493                         memcpy(&buf[bl], &entry, sizeof(struct iwinfo_assoclist_entry));
 494
 495                         bl += sizeof(struct iwinfo_assoclist_entry);
 496                         cp += si->isi_len;
 497                         tl -= si->isi_len;
 498                 } while (tl >= sizeof(struct ieee80211req_sta_info));
 499
 500                 *len = bl;
 501                 return 0;
 502         }
 503
 504         return -1;
 505 }
 506
 507 int madwifi_get_txpwrlist(const char *ifname, char *buf, int *len)
 508 {
 509         int rc = -1;
 510         char cmd[256];
 511
 512         /* A wifiX device? */
 513         if( madwifi_iswifi(ifname) )
 514         {
 515                 sprintf(cmd, "wlanconfig ath-txpwr create nounit "
 516                         "wlandev %s wlanmode ap >/dev/null", ifname);
 517
 518                 if( ! WEXITSTATUS(system(cmd)) )
 519                 {
 520                         rc = wext_get_txpwrlist("ath-txpwr", buf, len);
 521                         (void) WEXITSTATUS(system("wlanconfig ath-txpwr destroy"));
 522                 }
 523         }
 524
 525         /* Its an athX ... */
 526         else if( madwifi_isvap(ifname, NULL) )
 527         {
 528                 rc = wext_get_txpwrlist(ifname, buf, len);
 529         }
 530
 531         return rc;
 532 }
 533
 534 int madwifi_get_scanlist(const char *ifname, char *buf, int *len)
 535 {
 536         int ret;
 537         char cmd[256];
 538         DIR *proc;
 539         struct dirent *e;
 540
 541         ret = -1;
 542
 543         /* We got a wifiX device passed, try to lookup a vap on it */
 544         if( madwifi_iswifi(ifname) )
 545         {
 546                 if( (proc = opendir("/proc/sys/net/")) != NULL )
 547                 {
 548                         while( (e = readdir(proc)) != NULL )
 549                         {
 550                                 if( madwifi_isvap(e->d_name, ifname) )
 551                                 {
 552                                         sprintf(cmd, "ifconfig %s up", e->d_name);
 553
 554                                         if( ! WEXITSTATUS(system(cmd)) )
 555                                         {
 556                                                 ret = wext_get_scanlist(e->d_name, buf, len);
 557                                                 break;
 558                                         }
 559                                 }
 560                         }
 561
 562                         closedir(proc);
 563                 }
 564
 565                 /* Still nothing found, try to create a vap */
 566                 if( ret == -1 )
 567                 {
 568                         sprintf(cmd, "wlanconfig ath-scan create nounit "
 569                                 "wlandev %s wlanmode sta >/dev/null", ifname);
 570
 571                         if( ! WEXITSTATUS(system(cmd)) && ! WEXITSTATUS(system("ifconfig ath-scan up")) )
 572                         {
 573                                 ret = wext_get_scanlist("ath-scan", buf, len);
 574
 575                                 (void) WEXITSTATUS(system("ifconfig ath-scan down"));
 576                                 (void) WEXITSTATUS(system("wlanconfig ath-scan destroy"));
 577                         }
 578                 }
 579         }
 580
 581         /* Got athX device? */
 582         else if( madwifi_isvap(ifname, NULL) )
 583         {
 584                 ret = wext_get_scanlist(ifname, buf, len);
 585         }
 586
 587         return ret;
 588 }
 589
 590 int madwifi_get_freqlist(const char *ifname, char *buf, int *len)
 591 {
 592         int i, bl;
 593         int rc = -1;
 594         char cmd[256];
 595         struct ieee80211req_chaninfo chans;
 596         struct iwinfo_freqlist_entry entry;
 597
 598         /* A wifiX device? */
 599         if( madwifi_iswifi(ifname) )
 600         {
 601                 sprintf(cmd, "wlanconfig ath-channels create nounit "
 602                         "wlandev %s wlanmode ap >/dev/null", ifname);
 603
 604                 if( ! WEXITSTATUS(system(cmd)) )
 605                 {
 606                         rc = get80211priv("ath-channels", IEEE80211_IOCTL_GETCHANINFO, &chans, sizeof(chans));
 607                         (void) WEXITSTATUS(system("wlanconfig ath-channels destroy"));
 608                 }
 609         }
 610
 611         /* Its an athX ... */
 612         else if( madwifi_isvap(ifname, NULL) )
 613         {
 614                 rc = get80211priv(ifname, IEEE80211_IOCTL_GETCHANINFO, &chans, sizeof(chans));
 615         }
 616
 617
 618         /* Got chaninfo? */
 619         if( rc >= 0 )
 620         {
 621                 bl = 0;
 622
 623                 for( i = 0; i < chans.ic_nchans; i++ )
 624                 {
 625                         entry.mhz     = chans.ic_chans[i].ic_freq;
 626                         entry.channel = chans.ic_chans[i].ic_ieee;
 627
 628                         memcpy(&buf[bl], &entry, sizeof(struct iwinfo_freqlist_entry));
 629                         bl += sizeof(struct iwinfo_freqlist_entry);
 630                 }
 631
 632                 *len = bl;
 633                 return 0;
 634         }
 635
 636         return -1;
 637 }
 638
 639 int madwifi_get_mbssid_support(const char *ifname, int *buf)
 640 {
 641         /* We assume that multi bssid is always possible */
 642         *buf = 1;
 643         return 0;
 644 }
 645