util.c

   1 #include <ctype.h>
   2 #include <netlink/attr.h>
   3 #include <errno.h>
   4 #include <stdbool.h>
   5 #include "iw.h"
   6 #include "nl80211.h"
   7
   8 void mac_addr_n2a(char *mac_addr, unsigned char *arg)
   9 {
  10         int i, l;
  11
  12         l = 0;
  13         for (i = 0; i < ETH_ALEN ; i++) {
  14                 if (i == 0) {
  15                         sprintf(mac_addr+l, "%02x", arg[i]);
  16                         l += 2;
  17                 } else {
  18                         sprintf(mac_addr+l, ":%02x", arg[i]);
  19                         l += 3;
  20                 }
  21         }
  22 }
  23
  24 int mac_addr_a2n(unsigned char *mac_addr, char *arg)
  25 {
  26         int i;
  27
  28         for (i = 0; i < ETH_ALEN ; i++) {
  29                 int temp;
  30                 char *cp = strchr(arg, ':');
  31                 if (cp) {
  32                         *cp = 0;
  33                         cp++;
  34                 }
  35                 if (sscanf(arg, "%x", &temp) != 1)
  36                         return -1;
  37                 if (temp < 0 || temp > 255)
  38                         return -1;
  39
  40                 mac_addr[i] = temp;
  41                 if (!cp)
  42                         break;
  43                 arg = cp;
  44         }
  45         if (i < ETH_ALEN - 1)
  46                 return -1;
  47
  48         return 0;
  49 }
  50
  51 unsigned char *parse_hex(char *hex, size_t *outlen)
  52 {
  53         size_t len = strlen(hex);
  54         unsigned char *result = calloc(len/2 + 2, 1);
  55         int pos = 0;
  56
  57         if (!result)
  58                 return NULL;
  59
  60         *outlen = 0;
  61
  62         while (1) {
  63                 int temp;
  64                 char *cp = strchr(hex, ':');
  65                 if (cp) {
  66                         *cp = 0;
  67                         cp++;
  68                 }
  69                 if (sscanf(hex, "%x", &temp) != 1)
  70                         goto error;
  71                 if (temp < 0 || temp > 255)
  72                         goto error;
  73
  74                 (*outlen)++;
  75
  76                 result[pos++] = temp;
  77                 if (!cp)
  78                         break;
  79                 hex = cp;
  80         }
  81
  82         return result;
  83  error:
  84         free(result);
  85         return NULL;
  86 }
  87
  88 static const char *ifmodes[NL80211_IFTYPE_MAX + 1] = {
  89         "unspecified",
  90         "IBSS",
  91         "managed",
  92         "AP",
  93         "AP/VLAN",
  94         "WDS",
  95         "monitor",
  96         "mesh point"
  97 };
  98
  99 static char modebuf[100];
 100
 101 const char *iftype_name(enum nl80211_iftype iftype)
 102 {
 103         if (iftype <= NL80211_IFTYPE_MAX)
 104                 return ifmodes[iftype];
 105         sprintf(modebuf, "Unknown mode (%d)", iftype);
 106         return modebuf;
 107 }
 108
 109 static const char *commands[NL80211_CMD_MAX + 1] = {
 110         [NL80211_CMD_GET_WIPHY] = "get_wiphy",
 111         [NL80211_CMD_SET_WIPHY] = "set_wiphy",
 112         [NL80211_CMD_NEW_WIPHY] = "new_wiphy",
 113         [NL80211_CMD_DEL_WIPHY] = "del_wiphy",
 114         [NL80211_CMD_GET_INTERFACE] = "get_interface",
 115         [NL80211_CMD_SET_INTERFACE] = "set_interface",
 116         [NL80211_CMD_NEW_INTERFACE] = "new_interface",
 117         [NL80211_CMD_DEL_INTERFACE] = "del_interface",
 118         [NL80211_CMD_GET_KEY] = "get_key",
 119         [NL80211_CMD_SET_KEY] = "set_key",
 120         [NL80211_CMD_NEW_KEY] = "new_key",
 121         [NL80211_CMD_DEL_KEY] = "del_key",
 122         [NL80211_CMD_GET_BEACON] = "get_beacon",
 123         [NL80211_CMD_SET_BEACON] = "set_beacon",
 124         [NL80211_CMD_NEW_BEACON] = "new_beacon",
 125         [NL80211_CMD_DEL_BEACON] = "del_beacon",
 126         [NL80211_CMD_GET_STATION] = "get_station",
 127         [NL80211_CMD_SET_STATION] = "set_station",
 128         [NL80211_CMD_NEW_STATION] = "new_station",
 129         [NL80211_CMD_DEL_STATION] = "del_station",
 130         [NL80211_CMD_GET_MPATH] = "get_mpath",
 131         [NL80211_CMD_SET_MPATH] = "set_mpath",
 132         [NL80211_CMD_NEW_MPATH] = "new_mpath",
 133         [NL80211_CMD_DEL_MPATH] = "del_mpath",
 134         [NL80211_CMD_SET_BSS] = "set_bss",
 135         [NL80211_CMD_SET_REG] = "set_reg",
 136         [NL80211_CMD_REQ_SET_REG] = "reg_set_reg",
 137         [NL80211_CMD_GET_MESH_PARAMS] = "get_mesh_params",
 138         [NL80211_CMD_SET_MESH_PARAMS] = "set_mesh_params",
 139         [NL80211_CMD_SET_MGMT_EXTRA_IE] = "set_mgmt_extra_ie",
 140         [NL80211_CMD_GET_REG] = "get_reg",
 141         [NL80211_CMD_GET_SCAN] = "get_scan",
 142         [NL80211_CMD_TRIGGER_SCAN] = "trigger_scan",
 143         [NL80211_CMD_NEW_SCAN_RESULTS] = "new_scan_results",
 144         [NL80211_CMD_SCAN_ABORTED] = "scan_aborted",
 145         [NL80211_CMD_REG_CHANGE] = "reg_change",
 146         [NL80211_CMD_AUTHENTICATE] = "authenticate",
 147         [NL80211_CMD_ASSOCIATE] = "associate",
 148         [NL80211_CMD_DEAUTHENTICATE] = "deauthenticate",
 149         [NL80211_CMD_DISASSOCIATE] = "disassociate",
 150         [NL80211_CMD_MICHAEL_MIC_FAILURE] = "michael_mic_failure",
 151         [NL80211_CMD_REG_BEACON_HINT] = "reg_beacon_hint",
 152         [NL80211_CMD_JOIN_IBSS] = "join_ibss",
 153         [NL80211_CMD_LEAVE_IBSS] = "leave_ibss",
 154         [NL80211_CMD_TESTMODE] = "testmode",
 155         [NL80211_CMD_CONNECT] = "connect",
 156         [NL80211_CMD_ROAM] = "roam",
 157         [NL80211_CMD_DISCONNECT] = "disconnect",
 158         [NL80211_CMD_SET_WIPHY_NETNS] = "set_wiphy_netns",
 159         [NL80211_CMD_GET_SURVEY] = "get_survey",
 160         [NL80211_CMD_SET_PMKSA] = "set_pmksa",
 161         [NL80211_CMD_DEL_PMKSA] = "del_pmksa",
 162         [NL80211_CMD_FLUSH_PMKSA] = "flush_pmksa",
 163         [NL80211_CMD_REMAIN_ON_CHANNEL] = "remain_on_channel",
 164         [NL80211_CMD_CANCEL_REMAIN_ON_CHANNEL] = "cancel_remain_on_channel",
 165         [NL80211_CMD_SET_TX_BITRATE_MASK] = "set_tx_bitrate_mask",
 166         [NL80211_CMD_REGISTER_ACTION] = "register_action",
 167         [NL80211_CMD_ACTION] = "action",
 168 };
 169
 170 static char cmdbuf[100];
 171
 172 const char *command_name(enum nl80211_commands cmd)
 173 {
 174         if (cmd <= NL80211_CMD_MAX && commands[cmd])
 175                 return commands[cmd];
 176         sprintf(cmdbuf, "Unknown command (%d)", cmd);
 177         return cmdbuf;
 178 }
 179
 180 int ieee80211_channel_to_frequency(int chan)
 181 {
 182         if (chan < 14)
 183                 return 2407 + chan * 5;
 184
 185         if (chan == 14)
 186                 return 2484;
 187
 188         /* FIXME: dot11ChannelStartingFactor (802.11-2007 17.3.8.3.2) */
 189         return (chan + 1000) * 5;
 190 }
 191
 192 int ieee80211_frequency_to_channel(int freq)
 193 {
 194         if (freq == 2484)
 195                 return 14;
 196
 197         if (freq < 2484)
 198                 return (freq - 2407) / 5;
 199
 200         /* FIXME: dot11ChannelStartingFactor (802.11-2007 17.3.8.3.2) */
 201         return freq/5 - 1000;
 202 }
 203
 204 void print_ssid_escaped(const uint8_t len, const uint8_t *data)
 205 {
 206         int i;
 207
 208         for (i = 0; i < len; i++) {
 209                 if (isprint(data[i]))
 210                         printf("%c", data[i]);
 211                 else
 212                         printf("\\x%.2x", data[i]);
 213         }
 214 }
 215
 216 static int hex2num(char digit)
 217 {
 218         if (!isxdigit(digit))
 219                 return -1;
 220         if (isdigit(digit))
 221                 return digit - '0';
 222         return tolower(digit) - 'a' + 10;
 223 }
 224
 225 static int hex2byte(char *hex)
 226 {
 227         int d1, d2;
 228
 229         d1 = hex2num(hex[0]);
 230         if (d1 < 0)
 231                 return -1;
 232         d2 = hex2num(hex[1]);
 233         if (d2 < 0)
 234                 return -1;
 235         return (d1 << 4) | d2;
 236 }
 237
 238 static char *hex2bin(char *hex, char *buf)
 239 {
 240         char *result = buf;
 241         int d;
 242
 243         while (hex[0]) {
 244                 d = hex2byte(hex);
 245                 if (d < 0)
 246                         return NULL;
 247                 buf[0] = d;
 248                 buf++;
 249                 hex += 2;
 250         }
 251
 252         return result;
 253 }
 254
 255 int parse_keys(struct nl_msg *msg, char **argv, int argc)
 256 {
 257         struct nlattr *keys;
 258         int i = 0;
 259         bool have_default = false;
 260         char keybuf[13];
 261
 262         if (!argc)
 263                 return 1;
 264
 265         NLA_PUT_FLAG(msg, NL80211_ATTR_PRIVACY);
 266
 267         keys = nla_nest_start(msg, NL80211_ATTR_KEYS);
 268         if (!keys)
 269                 return -ENOBUFS;
 270
 271         do {
 272                 char *arg = *argv;
 273                 int pos = 0, keylen;
 274                 struct nlattr *key = nla_nest_start(msg, ++i);
 275                 char *keydata;
 276
 277                 if (!key)
 278                         return -ENOBUFS;
 279
 280                 if (arg[pos] == 'd') {
 281                         NLA_PUT_FLAG(msg, NL80211_KEY_DEFAULT);
 282                         pos++;
 283                         if (arg[pos] == ':')
 284                                 pos++;
 285                         have_default = true;
 286                 }
 287
 288                 if (!isdigit(arg[pos]))
 289                         goto explain;
 290                 NLA_PUT_U8(msg, NL80211_KEY_IDX, arg[pos++] - '0');
 291                 if (arg[pos++] != ':')
 292                         goto explain;
 293                 keydata = arg + pos;
 294                 switch (strlen(keydata)) {
 295                 case 10:
 296                         keydata = hex2bin(keydata, keybuf);
 297                 case 5:
 298                         NLA_PUT_U32(msg, NL80211_KEY_CIPHER, 0x000FAC01);
 299                         keylen = 5;
 300                         break;
 301                 case 26:
 302                         keydata = hex2bin(keydata, keybuf);
 303                 case 13:
 304                         NLA_PUT_U32(msg, NL80211_KEY_CIPHER, 0x000FAC05);
 305                         keylen = 13;
 306                         break;
 307                 default:
 308                         goto explain;
 309                 }
 310
 311                 if (!keydata)
 312                         goto explain;
 313
 314                 NLA_PUT(msg, NL80211_KEY_DATA, keylen, keydata);
 315
 316                 argv++;
 317                 argc--;
 318
 319                 /* one key should be TX key */
 320                 if (!have_default && !argc)
 321                         NLA_PUT_FLAG(msg, NL80211_KEY_DEFAULT);
 322
 323                 nla_nest_end(msg, key);
 324         } while (argc);
 325
 326         nla_nest_end(msg, keys);
 327
 328         return 0;
 329  nla_put_failure:
 330         return -ENOBUFS;
 331  explain:
 332         fprintf(stderr, "key must be [d:]index:data where\n"
 333                         "  'd:'     means default (transmit) key\n"
 334                         "  'index:' is a single digit (0-3)\n"
 335                         "  'data'   must be 5 or 13 ascii chars\n"
 336                         "           or 10 or 26 hex digits\n"
 337                         "for example: d:2:6162636465 is the same as d:2:abcde\n");
 338         return 2;
 339 }
 340
 341 static void print_mcs_index(const __u8 *mcs)
 342 {
 343         unsigned int mcs_bit, prev_bit = -2, prev_cont = 0;
 344
 345         for (mcs_bit = 0; mcs_bit <= 76; mcs_bit++) {
 346                 unsigned int mcs_octet = mcs_bit/8;
 347                 unsigned int MCS_RATE_BIT = 1 << mcs_bit % 8;
 348                 bool mcs_rate_idx_set;
 349
 350                 mcs_rate_idx_set = !!(mcs[mcs_octet] & MCS_RATE_BIT);
 351
 352                 if (!mcs_rate_idx_set)
 353                         continue;
 354
 355                 if (prev_bit != mcs_bit - 1) {
 356                         if (prev_bit != -2)
 357                                 printf("%d, ", prev_bit);
 358                         else
 359                                 printf(" ");
 360                         printf("%d", mcs_bit);
 361                         prev_cont = 0;
 362                 } else if (!prev_cont) {
 363                         printf("-");
 364                         prev_cont = 1;
 365                 }
 366
 367                 prev_bit = mcs_bit;
 368         }
 369
 370         if (prev_cont)
 371                 printf("%d", prev_bit);
 372         printf("\n");
 373 }
 374
 375 /*
 376  * There are only 4 possible values, we just use a case instead of computing it,
 377  * but technically this can also be computed through the formula:
 378  *
 379  * Max AMPDU length = (2 ^ (13 + exponent)) - 1 bytes
 380  */
 381 static __u32 compute_ampdu_length(__u8 exponent)
 382 {
 383         switch (exponent) {
 384         case 0: return 8191;  /* (2 ^(13 + 0)) -1 */
 385         case 1: return 16383; /* (2 ^(13 + 1)) -1 */
 386         case 2: return 32767; /* (2 ^(13 + 2)) -1 */
 387         case 3: return 65535; /* (2 ^(13 + 3)) -1 */
 388         default: return 0;
 389         }
 390 }
 391
 392 static const char *print_ampdu_space(__u8 space)
 393 {
 394         switch (space) {
 395         case 0: return "No restriction";
 396         case 1: return "1/4 usec";
 397         case 2: return "1/2 usec";
 398         case 3: return "1 usec";
 399         case 4: return "2 usec";
 400         case 5: return "4 usec";
 401         case 6: return "8 usec";
 402         case 7: return "16 usec";
 403         default:
 404                 return "BUG (spacing more than 3 bits!)";
 405         }
 406 }
 407
 408 void print_ampdu_length(__u8 exponent)
 409 {
 410         __u32 max_ampdu_length;
 411
 412         max_ampdu_length = compute_ampdu_length(exponent);
 413
 414         if (max_ampdu_length) {
 415                 printf("\t\tMaximum RX AMPDU length %d bytes (exponent: 0x0%02x)\n",
 416                        max_ampdu_length, exponent);
 417         } else {
 418                 printf("\t\tMaximum RX AMPDU length: unrecognized bytes "
 419                        "(exponent: %d)\n", exponent);
 420         }
 421 }
 422
 423 void print_ampdu_spacing(__u8 spacing)
 424 {
 425         printf("\t\tMinimum RX AMPDU time spacing: %s (0x%02x)\n",
 426                print_ampdu_space(spacing), spacing);
 427 }
 428
 429 void print_ht_capability(__u16 cap)
 430 {
 431 #define PRINT_HT_CAP(_cond, _str) \
 432         do { \
 433                 if (_cond) \
 434                         printf("\t\t\t" _str "\n"); \
 435         } while (0)
 436
 437         printf("\t\tCapabilities: 0x%02x\n", cap);
 438
 439         PRINT_HT_CAP((cap & BIT(0)), "RX LDCP");
 440         PRINT_HT_CAP((cap & BIT(1)), "HT20/HT40");
 441         PRINT_HT_CAP(!(cap & BIT(1)), "HT20");
 442
 443         PRINT_HT_CAP(((cap >> 2) & 0x3) == 0, "Static SM Power Save");
 444         PRINT_HT_CAP(((cap >> 2) & 0x3) == 1, "Dynamic SM Power Save");
 445         PRINT_HT_CAP(((cap >> 2) & 0x3) == 3, "SM Power Save disabled");
 446
 447         PRINT_HT_CAP((cap & BIT(4)), "RX Greenfield");
 448         PRINT_HT_CAP((cap & BIT(5)), "RX HT20 SGI");
 449         PRINT_HT_CAP((cap & BIT(6)), "RX HT40 SGI");
 450         PRINT_HT_CAP((cap & BIT(7)), "TX STBC");
 451
 452         PRINT_HT_CAP(((cap >> 8) & 0x3) == 0, "No RX STBC");
 453         PRINT_HT_CAP(((cap >> 8) & 0x3) == 1, "RX STBC 1-stream");
 454         PRINT_HT_CAP(((cap >> 8) & 0x3) == 2, "RX STBC 2-streams");
 455         PRINT_HT_CAP(((cap >> 8) & 0x3) == 3, "RX STBC 3-streams");
 456
 457         PRINT_HT_CAP((cap & BIT(10)), "HT Delayed Block Ack");
 458
 459         PRINT_HT_CAP((cap & BIT(11)), "Max AMSDU length: 3839 bytes");
 460         PRINT_HT_CAP(!(cap & BIT(11)), "Max AMSDU length: 7935 bytes");
 461
 462         /*
 463          * For beacons and probe response this would mean the BSS
 464          * does or does not allow the usage of DSSS/CCK HT40.
 465          * Otherwise it means the STA does or does not use
 466          * DSSS/CCK HT40.
 467          */
 468         PRINT_HT_CAP((cap & BIT(12)), "DSSS/CCK HT40");
 469         PRINT_HT_CAP(!(cap & BIT(12)), "No DSSS/CCK HT40");
 470
 471         /* BIT(13) is reserved */
 472
 473         PRINT_HT_CAP((cap & BIT(14)), "40 MHz Intolerant");
 474
 475         PRINT_HT_CAP((cap & BIT(15)), "L-SIG TXOP protection");
 476 #undef PRINT_HT_CAP
 477 }
 478
 479 void print_ht_mcs(const __u8 *mcs)
 480 {
 481         /* As defined in 7.3.2.57.4 Supported MCS Set field */
 482         unsigned int tx_max_num_spatial_streams, max_rx_supp_data_rate;
 483         bool tx_mcs_set_defined, tx_mcs_set_equal, tx_unequal_modulation;
 484
 485         max_rx_supp_data_rate = ((mcs[10] >> 8) & ((mcs[11] & 0x3) << 8));
 486         tx_mcs_set_defined = !!(mcs[12] & (1 << 0));
 487         tx_mcs_set_equal = !(mcs[12] & (1 << 1));
 488         tx_max_num_spatial_streams = ((mcs[12] >> 2) & 3) + 1;
 489         tx_unequal_modulation = !!(mcs[12] & (1 << 4));
 490
 491         if (max_rx_supp_data_rate)
 492                 printf("\t\tHT Max RX data rate: %d Mbps\n", max_rx_supp_data_rate);
 493         /* XXX: else see 9.6.0e.5.3 how to get this I think */
 494
 495         if (tx_mcs_set_defined) {
 496                 if (tx_mcs_set_equal) {
 497                         printf("\t\tHT TX/RX MCS rate indexes supported:");
 498                         print_mcs_index(mcs);
 499                 } else {
 500                         printf("\t\tHT RX MCS rate indexes supported:");
 501                         print_mcs_index(mcs);
 502
 503                         if (tx_unequal_modulation)
 504                                 printf("\t\tTX unequal modulation supported\n");
 505                         else
 506                                 printf("\t\tTX unequal modulation not supported\n");
 507
 508                         printf("\t\tHT TX Max spatial streams: %d\n",
 509                                 tx_max_num_spatial_streams);
 510
 511                         printf("\t\tHT TX MCS rate indexes supported may differ\n");
 512                 }
 513         } else {
 514                 printf("\t\tHT RX MCS rate indexes supported:");
 515                 print_mcs_index(mcs);
 516                 printf("\t\tHT TX MCS rate indexes are undefined\n");
 517         }
 518 }