err.no Git - linux-2.6/blob - drivers/net/wireless/libertas/scan.c

   1 /**
   2   * Functions implementing wlan scan IOCTL and firmware command APIs
   3   *
   4   * IOCTL handlers as well as command preperation and response routines
   5   *  for sending scan commands to the firmware.
   6   */
   7 #include <linux/ctype.h>
   8 #include <linux/if.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/wireless.h>
  11 #include <linux/etherdevice.h>
  12
  13 #include <net/ieee80211.h>
  14 #include <net/iw_handler.h>
  15
  16 #include <asm/unaligned.h>
  17
  18 #include "host.h"
  19 #include "decl.h"
  20 #include "dev.h"
  21 #include "scan.h"
  22 #include "join.h"
  23 #include "cmd.h"
  24
  25 //! Approximate amount of data needed to pass a scan result back to iwlist
  26 #define MAX_SCAN_CELL_SIZE  (IW_EV_ADDR_LEN             \
  27                              + IW_ESSID_MAX_SIZE        \
  28                              + IW_EV_UINT_LEN           \
  29                              + IW_EV_FREQ_LEN           \
  30                              + IW_EV_QUAL_LEN           \
  31                              + IW_ESSID_MAX_SIZE        \
  32                              + IW_EV_PARAM_LEN          \
  33                              + 40)      /* 40 for WPAIE */
  34
  35 //! Memory needed to store a max sized channel List TLV for a firmware scan
  36 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mrvlietypesheader)    \
  37                             + (MRVDRV_MAX_CHANNELS_PER_SCAN     \
  38                                * sizeof(struct chanscanparamset)))
  39
  40 //! Memory needed to store a max number/size SSID TLV for a firmware scan
  41 #define SSID_TLV_MAX_SIZE  (1 * sizeof(struct mrvlietypes_ssidparamset))
  42
  43 //! Maximum memory needed for a cmd_ds_802_11_scan with all TLVs at max
  44 #define MAX_SCAN_CFG_ALLOC (sizeof(struct cmd_ds_802_11_scan)   \
  45                             + CHAN_TLV_MAX_SIZE + SSID_TLV_MAX_SIZE)
  46
  47 //! The maximum number of channels the firmware can scan per command
  48 #define MRVDRV_MAX_CHANNELS_PER_SCAN   14
  49
  50 /**
  51  * @brief Number of channels to scan per firmware scan command issuance.
  52  *
  53  *  Number restricted to prevent hitting the limit on the amount of scan data
  54  *  returned in a single firmware scan command.
  55  */
  56 #define MRVDRV_CHANNELS_PER_SCAN_CMD   4
  57
  58 //! Scan time specified in the channel TLV for each channel for passive scans
  59 #define MRVDRV_PASSIVE_SCAN_CHAN_TIME  100
  60
  61 //! Scan time specified in the channel TLV for each channel for active scans
  62 #define MRVDRV_ACTIVE_SCAN_CHAN_TIME   100
  63
  64 static const u8 zeromac[ETH_ALEN] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
  65 static const u8 bcastmac[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  66
  67 static int lbs_ret_80211_scan(struct lbs_private *priv, unsigned long dummy,
  68                               struct cmd_header *resp);
  69
  70 /*********************************************************************/
  71 /*                                                                   */
  72 /*  Misc helper functions                                            */
  73 /*                                                                   */
  74 /*********************************************************************/
  75
  76 /**
  77  *  @brief Unsets the MSB on basic rates
  78  *
  79  * Scan through an array and unset the MSB for basic data rates.
  80  *
  81  *  @param rates     buffer of data rates
  82  *  @param len       size of buffer
  83  */
  84 static void lbs_unset_basic_rate_flags(u8 *rates, size_t len)
  85 {
  86         int i;
  87
  88         for (i = 0; i < len; i++)
  89                 rates[i] &= 0x7f;
  90 }
  91
  92
  93 static inline void clear_bss_descriptor (struct bss_descriptor * bss)
  94 {
  95         /* Don't blow away ->list, just BSS data */
  96         memset(bss, 0, offsetof(struct bss_descriptor, list));
  97 }
  98
  99 /**
 100  *  @brief Compare two SSIDs
 101  *
 102  *  @param ssid1    A pointer to ssid to compare
 103  *  @param ssid2    A pointer to ssid to compare
 104  *
 105  *  @return         0: ssid is same, otherwise is different
 106  */
 107 int lbs_ssid_cmp(u8 *ssid1, u8 ssid1_len, u8 *ssid2, u8 ssid2_len)
 108 {
 109         if (ssid1_len != ssid2_len)
 110                 return -1;
 111
 112         return memcmp(ssid1, ssid2, ssid1_len);
 113 }
 114
 115 static inline int match_bss_no_security(struct lbs_802_11_security *secinfo,
 116                         struct bss_descriptor * match_bss)
 117 {
 118         if (   !secinfo->wep_enabled
 119             && !secinfo->WPAenabled
 120             && !secinfo->WPA2enabled
 121             && match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC
 122             && match_bss->rsn_ie[0] != MFIE_TYPE_RSN
 123             && !(match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 124                 return 1;
 125         }
 126         return 0;
 127 }
 128
 129 static inline int match_bss_static_wep(struct lbs_802_11_security *secinfo,
 130                         struct bss_descriptor * match_bss)
 131 {
 132         if ( secinfo->wep_enabled
 133            && !secinfo->WPAenabled
 134            && !secinfo->WPA2enabled
 135            && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 136                 return 1;
 137         }
 138         return 0;
 139 }
 140
 141 static inline int match_bss_wpa(struct lbs_802_11_security *secinfo,
 142                         struct bss_descriptor * match_bss)
 143 {
 144         if (  !secinfo->wep_enabled
 145            && secinfo->WPAenabled
 146            && (match_bss->wpa_ie[0] == MFIE_TYPE_GENERIC)
 147            /* privacy bit may NOT be set in some APs like LinkSys WRT54G
 148               && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 149             */
 150            ) {
 151                 return 1;
 152         }
 153         return 0;
 154 }
 155
 156 static inline int match_bss_wpa2(struct lbs_802_11_security *secinfo,
 157                         struct bss_descriptor * match_bss)
 158 {
 159         if (  !secinfo->wep_enabled
 160            && secinfo->WPA2enabled
 161            && (match_bss->rsn_ie[0] == MFIE_TYPE_RSN)
 162            /* privacy bit may NOT be set in some APs like LinkSys WRT54G
 163               && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 164             */
 165            ) {
 166                 return 1;
 167         }
 168         return 0;
 169 }
 170
 171 static inline int match_bss_dynamic_wep(struct lbs_802_11_security *secinfo,
 172                         struct bss_descriptor * match_bss)
 173 {
 174         if (  !secinfo->wep_enabled
 175            && !secinfo->WPAenabled
 176            && !secinfo->WPA2enabled
 177            && (match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC)
 178            && (match_bss->rsn_ie[0] != MFIE_TYPE_RSN)
 179            && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 180                 return 1;
 181         }
 182         return 0;
 183 }
 184
 185 static inline int is_same_network(struct bss_descriptor *src,
 186                                   struct bss_descriptor *dst)
 187 {
 188         /* A network is only a duplicate if the channel, BSSID, and ESSID
 189          * all match.  We treat all <hidden> with the same BSSID and channel
 190          * as one network */
 191         return ((src->ssid_len == dst->ssid_len) &&
 192                 (src->channel == dst->channel) &&
 193                 !compare_ether_addr(src->bssid, dst->bssid) &&
 194                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
 195 }
 196
 197 /**
 198  *  @brief Check if a scanned network compatible with the driver settings
 199  *
 200  *   WEP     WPA     WPA2    ad-hoc  encrypt                      Network
 201  * enabled enabled  enabled   AES     mode   privacy  WPA  WPA2  Compatible
 202  *    0       0        0       0      NONE      0      0    0   yes No security
 203  *    1       0        0       0      NONE      1      0    0   yes Static WEP
 204  *    0       1        0       0       x        1x     1    x   yes WPA
 205  *    0       0        1       0       x        1x     x    1   yes WPA2
 206  *    0       0        0       1      NONE      1      0    0   yes Ad-hoc AES
 207  *    0       0        0       0     !=NONE     1      0    0   yes Dynamic WEP
 208  *
 209  *
 210  *  @param priv A pointer to struct lbs_private
 211  *  @param index   Index in scantable to check against current driver settings
 212  *  @param mode    Network mode: Infrastructure or IBSS
 213  *
 214  *  @return        Index in scantable, or error code if negative
 215  */
 216 static int is_network_compatible(struct lbs_private *priv,
 217                 struct bss_descriptor * bss, u8 mode)
 218 {
 219         int matched = 0;
 220
 221         lbs_deb_enter(LBS_DEB_SCAN);
 222
 223         if (bss->mode != mode)
 224                 goto done;
 225
 226         if ((matched = match_bss_no_security(&priv->secinfo, bss))) {
 227                 goto done;
 228         } else if ((matched = match_bss_static_wep(&priv->secinfo, bss))) {
 229                 goto done;
 230         } else if ((matched = match_bss_wpa(&priv->secinfo, bss))) {
 231                 lbs_deb_scan(
 232                        "is_network_compatible() WPA: wpa_ie 0x%x "
 233                        "wpa2_ie 0x%x WEP %s WPA %s WPA2 %s "
 234                        "privacy 0x%x\n", bss->wpa_ie[0], bss->rsn_ie[0],
 235                        priv->secinfo.wep_enabled ? "e" : "d",
 236                        priv->secinfo.WPAenabled ? "e" : "d",
 237                        priv->secinfo.WPA2enabled ? "e" : "d",
 238                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
 239                 goto done;
 240         } else if ((matched = match_bss_wpa2(&priv->secinfo, bss))) {
 241                 lbs_deb_scan(
 242                        "is_network_compatible() WPA2: wpa_ie 0x%x "
 243                        "wpa2_ie 0x%x WEP %s WPA %s WPA2 %s "
 244                        "privacy 0x%x\n", bss->wpa_ie[0], bss->rsn_ie[0],
 245                        priv->secinfo.wep_enabled ? "e" : "d",
 246                        priv->secinfo.WPAenabled ? "e" : "d",
 247                        priv->secinfo.WPA2enabled ? "e" : "d",
 248                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
 249                 goto done;
 250         } else if ((matched = match_bss_dynamic_wep(&priv->secinfo, bss))) {
 251                 lbs_deb_scan(
 252                        "is_network_compatible() dynamic WEP: "
 253                        "wpa_ie 0x%x wpa2_ie 0x%x privacy 0x%x\n",
 254                        bss->wpa_ie[0], bss->rsn_ie[0],
 255                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
 256                 goto done;
 257         }
 258
 259         /* bss security settings don't match those configured on card */
 260         lbs_deb_scan(
 261                "is_network_compatible() FAILED: wpa_ie 0x%x "
 262                "wpa2_ie 0x%x WEP %s WPA %s WPA2 %s privacy 0x%x\n",
 263                bss->wpa_ie[0], bss->rsn_ie[0],
 264                priv->secinfo.wep_enabled ? "e" : "d",
 265                priv->secinfo.WPAenabled ? "e" : "d",
 266                priv->secinfo.WPA2enabled ? "e" : "d",
 267                (bss->capability & WLAN_CAPABILITY_PRIVACY));
 268
 269 done:
 270         lbs_deb_leave_args(LBS_DEB_SCAN, "matched: %d", matched);
 271         return matched;
 272 }
 273
 274
 275
 276
 277 /*********************************************************************/
 278 /*                                                                   */
 279 /*  Main scanning support                                            */
 280 /*                                                                   */
 281 /*********************************************************************/
 282
 283 void lbs_scan_worker(struct work_struct *work)
 284 {
 285         struct lbs_private *priv =
 286                 container_of(work, struct lbs_private, scan_work.work);
 287
 288         lbs_deb_enter(LBS_DEB_SCAN);
 289         lbs_scan_networks(priv, NULL, 0);
 290         lbs_deb_leave(LBS_DEB_SCAN);
 291 }
 292
 293
 294 /**
 295  *  @brief Create a channel list for the driver to scan based on region info
 296  *
 297  *  Only used from lbs_scan_setup_scan_config()
 298  *
 299  *  Use the driver region/band information to construct a comprehensive list
 300  *    of channels to scan.  This routine is used for any scan that is not
 301  *    provided a specific channel list to scan.
 302  *
 303  *  @param priv          A pointer to struct lbs_private structure
 304  *  @param scanchanlist  Output parameter: resulting channel list to scan
 305  *  @param filteredscan  Flag indicating whether or not a BSSID or SSID filter
 306  *                       is being sent in the command to firmware.  Used to
 307  *                       increase the number of channels sent in a scan
 308  *                       command and to disable the firmware channel scan
 309  *                       filter.
 310  *
 311  *  @return              void
 312  */
 313 static int lbs_scan_create_channel_list(struct lbs_private *priv,
 314                                           struct chanscanparamset * scanchanlist,
 315                                           u8 filteredscan)
 316 {
 317
 318         struct region_channel *scanregion;
 319         struct chan_freq_power *cfp;
 320         int rgnidx;
 321         int chanidx;
 322         int nextchan;
 323         u8 scantype;
 324
 325         chanidx = 0;
 326
 327         /* Set the default scan type to the user specified type, will later
 328          *   be changed to passive on a per channel basis if restricted by
 329          *   regulatory requirements (11d or 11h)
 330          */
 331         scantype = CMD_SCAN_TYPE_ACTIVE;
 332
 333         for (rgnidx = 0; rgnidx < ARRAY_SIZE(priv->region_channel); rgnidx++) {
 334                 if (priv->enable11d &&
 335                     (priv->connect_status != LBS_CONNECTED) &&
 336                     (priv->mesh_connect_status != LBS_CONNECTED)) {
 337                         /* Scan all the supported chan for the first scan */
 338                         if (!priv->universal_channel[rgnidx].valid)
 339                                 continue;
 340                         scanregion = &priv->universal_channel[rgnidx];
 341
 342                         /* clear the parsed_region_chan for the first scan */
 343                         memset(&priv->parsed_region_chan, 0x00,
 344                                sizeof(priv->parsed_region_chan));
 345                 } else {
 346                         if (!priv->region_channel[rgnidx].valid)
 347                                 continue;
 348                         scanregion = &priv->region_channel[rgnidx];
 349                 }
 350
 351                 for (nextchan = 0;
 352                      nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
 353
 354                         cfp = scanregion->CFP + nextchan;
 355
 356                         if (priv->enable11d) {
 357                                 scantype =
 358                                     lbs_get_scan_type_11d(cfp->channel,
 359                                                            &priv->
 360                                                            parsed_region_chan);
 361                         }
 362
 363                         switch (scanregion->band) {
 364                         case BAND_B:
 365                         case BAND_G:
 366                         default:
 367                                 scanchanlist[chanidx].radiotype =
 368                                     CMD_SCAN_RADIO_TYPE_BG;
 369                                 break;
 370                         }
 371
 372                         if (scantype == CMD_SCAN_TYPE_PASSIVE) {
 373                                 scanchanlist[chanidx].maxscantime =
 374                                     cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
 375                                 scanchanlist[chanidx].chanscanmode.passivescan =
 376                                     1;
 377                         } else {
 378                                 scanchanlist[chanidx].maxscantime =
 379                                     cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
 380                                 scanchanlist[chanidx].chanscanmode.passivescan =
 381                                     0;
 382                         }
 383
 384                         scanchanlist[chanidx].channumber = cfp->channel;
 385
 386                         if (filteredscan) {
 387                                 scanchanlist[chanidx].chanscanmode.
 388                                     disablechanfilt = 1;
 389                         }
 390                 }
 391         }
 392         return chanidx;
 393 }
 394
 395
 396 /*
 397  * Add SSID TLV of the form:
 398  *
 399  * TLV-ID SSID     00 00
 400  * length          06 00
 401  * ssid            4d 4e 54 45 53 54
 402  */
 403 static int lbs_scan_add_ssid_tlv(u8 *tlv,
 404         const struct lbs_ioctl_user_scan_cfg *user_cfg)
 405 {
 406         struct mrvlietypes_ssidparamset *ssid_tlv =
 407                 (struct mrvlietypes_ssidparamset *)tlv;
 408         ssid_tlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
 409         ssid_tlv->header.len = cpu_to_le16(user_cfg->ssid_len);
 410         memcpy(ssid_tlv->ssid, user_cfg->ssid, user_cfg->ssid_len);
 411         return sizeof(ssid_tlv->header) + user_cfg->ssid_len;
 412 }
 413
 414
 415 /*
 416  * Add CHANLIST TLV of the form
 417  *
 418  * TLV-ID CHANLIST 01 01
 419  * length          5b 00
 420  * channel 1       00 01 00 00 00 64 00
 421  *   radio type    00
 422  *   channel          01
 423  *   scan type           00
 424  *   min scan time          00 00
 425  *   max scan time                64 00
 426  * channel 2       00 02 00 00 00 64 00
 427  * channel 3       00 03 00 00 00 64 00
 428  * channel 4       00 04 00 00 00 64 00
 429  * channel 5       00 05 00 00 00 64 00
 430  * channel 6       00 06 00 00 00 64 00
 431  * channel 7       00 07 00 00 00 64 00
 432  * channel 8       00 08 00 00 00 64 00
 433  * channel 9       00 09 00 00 00 64 00
 434  * channel 10      00 0a 00 00 00 64 00
 435  * channel 11      00 0b 00 00 00 64 00
 436  * channel 12      00 0c 00 00 00 64 00
 437  * channel 13      00 0d 00 00 00 64 00
 438  *
 439  */
 440 static int lbs_scan_add_chanlist_tlv(u8 *tlv,
 441         struct chanscanparamset *chan_list,
 442         int chan_count)
 443 {
 444         size_t size = sizeof(struct chanscanparamset) * chan_count;
 445         struct mrvlietypes_chanlistparamset *chan_tlv =
 446                 (struct mrvlietypes_chanlistparamset *) tlv;
 447
 448         chan_tlv->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 449         memcpy(chan_tlv->chanscanparam, chan_list, size);
 450         chan_tlv->header.len = cpu_to_le16(size);
 451         return sizeof(chan_tlv->header) + size;
 452 }
 453
 454
 455 /*
 456  * Add RATES TLV of the form
 457  *
 458  * TLV-ID RATES    01 00
 459  * length          0e 00
 460  * rates           82 84 8b 96 0c 12 18 24 30 48 60 6c
 461  *
 462  * The rates are in lbs_bg_rates[], but for the 802.11b
 463  * rates the high bit isn't set.
 464  */
 465 static int lbs_scan_add_rates_tlv(u8 *tlv)
 466 {
 467         int i;
 468         struct mrvlietypes_ratesparamset *rate_tlv =
 469                 (struct mrvlietypes_ratesparamset *) tlv;
 470
 471         rate_tlv->header.type = cpu_to_le16(TLV_TYPE_RATES);
 472         tlv += sizeof(rate_tlv->header);
 473         for (i = 0; i < MAX_RATES; i++) {
 474                 *tlv = lbs_bg_rates[i];
 475                 if (*tlv == 0)
 476                         break;
 477                 /* This code makes sure that the 802.11b rates (1 MBit/s, 2
 478                    MBit/s, 5.5 MBit/s and 11 MBit/s get's the high bit set.
 479                    Note that the values are MBit/s * 2, to mark them as
 480                    basic rates so that the firmware likes it better */
 481                 if (*tlv == 0x02 || *tlv == 0x04 ||
 482                     *tlv == 0x0b || *tlv == 0x16)
 483                         *tlv |= 0x80;
 484                 tlv++;
 485         }
 486         rate_tlv->header.len = cpu_to_le16(i);
 487         return sizeof(rate_tlv->header) + i;
 488 }
 489
 490
 491 /*
 492  * Generate the CMD_802_11_SCAN command with the proper tlv
 493  * for a bunch of channels.
 494  */
 495 static int lbs_do_scan(struct lbs_private *priv, uint8_t bsstype,
 496                        struct chanscanparamset *chan_list, int chan_count,
 497                        const struct lbs_ioctl_user_scan_cfg *user_cfg)
 498 {
 499         int ret = -ENOMEM;
 500         struct cmd_ds_802_11_scan *scan_cmd;
 501         uint8_t *tlv;   /* pointer into our current, growing TLV storage area */
 502
 503         lbs_deb_enter_args(LBS_DEB_SCAN, "bsstype %d, chanlist[].chan %d, chan_count %d",
 504                            bsstype, chan_list[0].channumber, chan_count);
 505
 506         /* create the fixed part for scan command */
 507         scan_cmd = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
 508         if (scan_cmd == NULL)
 509                 goto out;
 510
 511         tlv = scan_cmd->tlvbuffer;
 512         if (user_cfg)
 513                 memcpy(scan_cmd->bssid, user_cfg->bssid, ETH_ALEN);
 514         scan_cmd->bsstype = bsstype;
 515
 516         /* add TLVs */
 517         if (user_cfg && user_cfg->ssid_len)
 518                 tlv += lbs_scan_add_ssid_tlv(tlv, user_cfg);
 519         if (chan_list && chan_count)
 520                 tlv += lbs_scan_add_chanlist_tlv(tlv, chan_list, chan_count);
 521         tlv += lbs_scan_add_rates_tlv(tlv);
 522
 523         /* This is the final data we are about to send */
 524         scan_cmd->hdr.size = cpu_to_le16(tlv - (uint8_t *)scan_cmd);
 525         lbs_deb_hex(LBS_DEB_SCAN, "SCAN_CMD", (void *)scan_cmd,
 526                     sizeof(*scan_cmd));
 527         lbs_deb_hex(LBS_DEB_SCAN, "SCAN_TLV", scan_cmd->tlvbuffer,
 528                     tlv - scan_cmd->tlvbuffer);
 529
 530         ret = __lbs_cmd(priv, CMD_802_11_SCAN, &scan_cmd->hdr,
 531                         le16_to_cpu(scan_cmd->hdr.size),
 532                         lbs_ret_80211_scan, 0);
 533
 534 out:
 535         kfree(scan_cmd);
 536         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 537         return ret;
 538 }
 539
 540
 541 /**
 542  *  @brief Internal function used to start a scan based on an input config
 543  *
 544  *  Also used from debugfs
 545  *
 546  *  Use the input user scan configuration information when provided in
 547  *    order to send the appropriate scan commands to firmware to populate or
 548  *    update the internal driver scan table
 549  *
 550  *  @param priv          A pointer to struct lbs_private structure
 551  *  @param puserscanin   Pointer to the input configuration for the requested
 552  *                       scan.
 553  *
 554  *  @return              0 or < 0 if error
 555  */
 556 int lbs_scan_networks(struct lbs_private *priv,
 557         const struct lbs_ioctl_user_scan_cfg *user_cfg,
 558                        int full_scan)
 559 {
 560         int ret = -ENOMEM;
 561         struct chanscanparamset *chan_list;
 562         struct chanscanparamset *curr_chans;
 563         int chan_count;
 564         u8 bsstype = CMD_BSS_TYPE_ANY;
 565         int numchannels = MRVDRV_CHANNELS_PER_SCAN_CMD;
 566         int filteredscan = 0;
 567         union iwreq_data wrqu;
 568 #ifdef CONFIG_LIBERTAS_DEBUG
 569         struct bss_descriptor *iter;
 570         int i = 0;
 571         DECLARE_MAC_BUF(mac);
 572 #endif
 573
 574         lbs_deb_enter_args(LBS_DEB_SCAN, "full_scan %d",
 575                 full_scan);
 576
 577         /* Cancel any partial outstanding partial scans if this scan
 578          * is a full scan.
 579          */
 580         if (full_scan && delayed_work_pending(&priv->scan_work))
 581                 cancel_delayed_work(&priv->scan_work);
 582
 583         /* Determine same scan parameters */
 584         if (user_cfg) {
 585                 if (user_cfg->bsstype)
 586                         bsstype = user_cfg->bsstype;
 587                 if (compare_ether_addr(user_cfg->bssid, &zeromac[0]) != 0) {
 588                         numchannels = MRVDRV_MAX_CHANNELS_PER_SCAN;
 589                         filteredscan = 1;
 590                 }
 591         }
 592         lbs_deb_scan("numchannels %d, bsstype %d, "
 593                 "filteredscan %d\n",
 594                 numchannels, bsstype, filteredscan);
 595
 596         /* Create list of channels to scan */
 597         chan_list = kzalloc(sizeof(struct chanscanparamset) *
 598                                 LBS_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
 599         if (!chan_list) {
 600                 lbs_pr_alert("SCAN: chan_list empty\n");
 601                 goto out;
 602         }
 603
 604         /* We want to scan all channels */
 605         chan_count = lbs_scan_create_channel_list(priv, chan_list,
 606                 filteredscan);
 607
 608         netif_stop_queue(priv->dev);
 609         netif_carrier_off(priv->dev);
 610         if (priv->mesh_dev) {
 611                 netif_stop_queue(priv->mesh_dev);
 612                 netif_carrier_off(priv->mesh_dev);
 613         }
 614
 615         /* Prepare to continue an interrupted scan */
 616         lbs_deb_scan("chan_count %d, scan_channel %d\n",
 617                      chan_count, priv->scan_channel);
 618         curr_chans = chan_list;
 619         /* advance channel list by already-scanned-channels */
 620         if (priv->scan_channel > 0) {
 621                 curr_chans += priv->scan_channel;
 622                 chan_count -= priv->scan_channel;
 623         }
 624
 625         /* Send scan command(s)
 626          * numchannels contains the number of channels we should maximally scan
 627          * chan_count is the total number of channels to scan
 628          */
 629
 630         while (chan_count) {
 631                 int to_scan = min(numchannels, chan_count);
 632                 lbs_deb_scan("scanning %d of %d channels\n",
 633                         to_scan, chan_count);
 634                 ret = lbs_do_scan(priv, bsstype, curr_chans,
 635                         to_scan, user_cfg);
 636                 if (ret) {
 637                         lbs_pr_err("SCAN_CMD failed\n");
 638                         goto out2;
 639                 }
 640                 curr_chans += to_scan;
 641                 chan_count -= to_scan;
 642
 643                 /* somehow schedule the next part of the scan */
 644                 if (chan_count &&
 645                     !full_scan &&
 646                     !priv->surpriseremoved) {
 647                         /* -1 marks just that we're currently scanning */
 648                         if (priv->scan_channel < 0)
 649                                 priv->scan_channel = to_scan;
 650                         else
 651                                 priv->scan_channel += to_scan;
 652                         cancel_delayed_work(&priv->scan_work);
 653                         queue_delayed_work(priv->work_thread, &priv->scan_work,
 654                                 msecs_to_jiffies(300));
 655                         /* skip over GIWSCAN event */
 656                         goto out;
 657                 }
 658
 659         }
 660         memset(&wrqu, 0, sizeof(union iwreq_data));
 661         wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
 662
 663 #ifdef CONFIG_LIBERTAS_DEBUG
 664         /* Dump the scan table */
 665         mutex_lock(&priv->lock);
 666         lbs_deb_scan("scan table:\n");
 667         list_for_each_entry(iter, &priv->network_list, list)
 668                 lbs_deb_scan("%02d: BSSID %s, RSSI %d, SSID '%s'\n",
 669                        i++, print_mac(mac, iter->bssid), (s32) iter->rssi,
 670                        escape_essid(iter->ssid, iter->ssid_len));
 671         mutex_unlock(&priv->lock);
 672 #endif
 673
 674 out2:
 675         priv->scan_channel = 0;
 676
 677 out:
 678         if (priv->connect_status == LBS_CONNECTED) {
 679                 netif_carrier_on(priv->dev);
 680                 if (!priv->tx_pending_len)
 681                         netif_wake_queue(priv->dev);
 682         }
 683         if (priv->mesh_dev && (priv->mesh_connect_status == LBS_CONNECTED)) {
 684                 netif_carrier_on(priv->mesh_dev);
 685                 if (!priv->tx_pending_len)
 686                         netif_wake_queue(priv->mesh_dev);
 687         }
 688         kfree(chan_list);
 689
 690         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 691         return ret;
 692 }
 693
 694
 695
 696
 697 /*********************************************************************/
 698 /*                                                                   */
 699 /*  Result interpretation                                            */
 700 /*                                                                   */
 701 /*********************************************************************/
 702
 703 /**
 704  *  @brief Interpret a BSS scan response returned from the firmware
 705  *
 706  *  Parse the various fixed fields and IEs passed back for a a BSS probe
 707  *  response or beacon from the scan command.  Record information as needed
 708  *  in the scan table struct bss_descriptor for that entry.
 709  *
 710  *  @param bss  Output parameter: Pointer to the BSS Entry
 711  *
 712  *  @return             0 or -1
 713  */
 714 static int lbs_process_bss(struct bss_descriptor *bss,
 715                                 u8 ** pbeaconinfo, int *bytesleft)
 716 {
 717         struct ieeetypes_fhparamset *pFH;
 718         struct ieeetypes_dsparamset *pDS;
 719         struct ieeetypes_cfparamset *pCF;
 720         struct ieeetypes_ibssparamset *pibss;
 721         DECLARE_MAC_BUF(mac);
 722         struct ieeetypes_countryinfoset *pcountryinfo;
 723         u8 *pos, *end, *p;
 724         u8 n_ex_rates = 0, got_basic_rates = 0, n_basic_rates = 0;
 725         u16 beaconsize = 0;
 726         int ret;
 727
 728         lbs_deb_enter(LBS_DEB_SCAN);
 729
 730         if (*bytesleft >= sizeof(beaconsize)) {
 731                 /* Extract & convert beacon size from the command buffer */
 732                 beaconsize = le16_to_cpu(get_unaligned((__le16 *)*pbeaconinfo));
 733                 *bytesleft -= sizeof(beaconsize);
 734                 *pbeaconinfo += sizeof(beaconsize);
 735         }
 736
 737         if (beaconsize == 0 || beaconsize > *bytesleft) {
 738                 *pbeaconinfo += *bytesleft;
 739                 *bytesleft = 0;
 740                 ret = -1;
 741                 goto done;
 742         }
 743
 744         /* Initialize the current working beacon pointer for this BSS iteration */
 745         pos = *pbeaconinfo;
 746         end = pos + beaconsize;
 747
 748         /* Advance the return beacon pointer past the current beacon */
 749         *pbeaconinfo += beaconsize;
 750         *bytesleft -= beaconsize;
 751
 752         memcpy(bss->bssid, pos, ETH_ALEN);
 753         lbs_deb_scan("process_bss: BSSID %s\n", print_mac(mac, bss->bssid));
 754         pos += ETH_ALEN;
 755
 756         if ((end - pos) < 12) {
 757                 lbs_deb_scan("process_bss: Not enough bytes left\n");
 758                 ret = -1;
 759                 goto done;
 760         }
 761
 762         /*
 763          * next 4 fields are RSSI, time stamp, beacon interval,
 764          *   and capability information
 765          */
 766
 767         /* RSSI is 1 byte long */
 768         bss->rssi = *pos;
 769         lbs_deb_scan("process_bss: RSSI %d\n", *pos);
 770         pos++;
 771
 772         /* time stamp is 8 bytes long */
 773         pos += 8;
 774
 775         /* beacon interval is 2 bytes long */
 776         bss->beaconperiod = le16_to_cpup((void *) pos);
 777         pos += 2;
 778
 779         /* capability information is 2 bytes long */
 780         bss->capability = le16_to_cpup((void *) pos);
 781         lbs_deb_scan("process_bss: capabilities 0x%04x\n", bss->capability);
 782         pos += 2;
 783
 784         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 785                 lbs_deb_scan("process_bss: WEP enabled\n");
 786         if (bss->capability & WLAN_CAPABILITY_IBSS)
 787                 bss->mode = IW_MODE_ADHOC;
 788         else
 789                 bss->mode = IW_MODE_INFRA;
 790
 791         /* rest of the current buffer are IE's */
 792         lbs_deb_scan("process_bss: IE len %zd\n", end - pos);
 793         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: IE info", pos, end - pos);
 794
 795         /* process variable IE */
 796         while (pos <= end - 2) {
 797                 struct ieee80211_info_element * elem =
 798                         (struct ieee80211_info_element *) pos;
 799
 800                 if (pos + elem->len > end) {
 801                         lbs_deb_scan("process_bss: error in processing IE, "
 802                                "bytes left < IE length\n");
 803                         break;
 804                 }
 805
 806                 switch (elem->id) {
 807                 case MFIE_TYPE_SSID:
 808                         bss->ssid_len = elem->len;
 809                         memcpy(bss->ssid, elem->data, elem->len);
 810                         lbs_deb_scan("got SSID IE: '%s', len %u\n",
 811                                      escape_essid(bss->ssid, bss->ssid_len),
 812                                      bss->ssid_len);
 813                         break;
 814
 815                 case MFIE_TYPE_RATES:
 816                         n_basic_rates = min_t(u8, MAX_RATES, elem->len);
 817                         memcpy(bss->rates, elem->data, n_basic_rates);
 818                         got_basic_rates = 1;
 819                         lbs_deb_scan("got RATES IE\n");
 820                         break;
 821
 822                 case MFIE_TYPE_FH_SET:
 823                         pFH = (struct ieeetypes_fhparamset *) pos;
 824                         memmove(&bss->phyparamset.fhparamset, pFH,
 825                                 sizeof(struct ieeetypes_fhparamset));
 826                         lbs_deb_scan("got FH IE\n");
 827                         break;
 828
 829                 case MFIE_TYPE_DS_SET:
 830                         pDS = (struct ieeetypes_dsparamset *) pos;
 831                         bss->channel = pDS->currentchan;
 832                         memcpy(&bss->phyparamset.dsparamset, pDS,
 833                                sizeof(struct ieeetypes_dsparamset));
 834                         lbs_deb_scan("got DS IE, channel %d\n", bss->channel);
 835                         break;
 836
 837                 case MFIE_TYPE_CF_SET:
 838                         pCF = (struct ieeetypes_cfparamset *) pos;
 839                         memcpy(&bss->ssparamset.cfparamset, pCF,
 840                                sizeof(struct ieeetypes_cfparamset));
 841                         lbs_deb_scan("got CF IE\n");
 842                         break;
 843
 844                 case MFIE_TYPE_IBSS_SET:
 845                         pibss = (struct ieeetypes_ibssparamset *) pos;
 846                         bss->atimwindow = le16_to_cpu(pibss->atimwindow);
 847                         memmove(&bss->ssparamset.ibssparamset, pibss,
 848                                 sizeof(struct ieeetypes_ibssparamset));
 849                         lbs_deb_scan("got IBSS IE\n");
 850                         break;
 851
 852                 case MFIE_TYPE_COUNTRY:
 853                         pcountryinfo = (struct ieeetypes_countryinfoset *) pos;
 854                         lbs_deb_scan("got COUNTRY IE\n");
 855                         if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
 856                             || pcountryinfo->len > 254) {
 857                                 lbs_deb_scan("process_bss: 11D- Err "
 858                                        "CountryInfo len %d, min %zd, max 254\n",
 859                                        pcountryinfo->len,
 860                                        sizeof(pcountryinfo->countrycode));
 861                                 ret = -1;
 862                                 goto done;
 863                         }
 864
 865                         memcpy(&bss->countryinfo,
 866                                pcountryinfo, pcountryinfo->len + 2);
 867                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: 11d countryinfo",
 868                                 (u8 *) pcountryinfo,
 869                                 (u32) (pcountryinfo->len + 2));
 870                         break;
 871
 872                 case MFIE_TYPE_RATES_EX:
 873                         /* only process extended supported rate if data rate is
 874                          * already found. Data rate IE should come before
 875                          * extended supported rate IE
 876                          */
 877                         lbs_deb_scan("got RATESEX IE\n");
 878                         if (!got_basic_rates) {
 879                                 lbs_deb_scan("... but ignoring it\n");
 880                                 break;
 881                         }
 882
 883                         n_ex_rates = elem->len;
 884                         if (n_basic_rates + n_ex_rates > MAX_RATES)
 885                                 n_ex_rates = MAX_RATES - n_basic_rates;
 886
 887                         p = bss->rates + n_basic_rates;
 888                         memcpy(p, elem->data, n_ex_rates);
 889                         break;
 890
 891                 case MFIE_TYPE_GENERIC:
 892                         if (elem->len >= 4 &&
 893                             elem->data[0] == 0x00 &&
 894                             elem->data[1] == 0x50 &&
 895                             elem->data[2] == 0xf2 &&
 896                             elem->data[3] == 0x01) {
 897                                 bss->wpa_ie_len = min(elem->len + 2,
 898                                                       MAX_WPA_IE_LEN);
 899                                 memcpy(bss->wpa_ie, elem, bss->wpa_ie_len);
 900                                 lbs_deb_scan("got WPA IE\n");
 901                                 lbs_deb_hex(LBS_DEB_SCAN, "WPA IE", bss->wpa_ie,
 902                                             elem->len);
 903                         } else if (elem->len >= MARVELL_MESH_IE_LENGTH &&
 904                             elem->data[0] == 0x00 &&
 905                             elem->data[1] == 0x50 &&
 906                             elem->data[2] == 0x43 &&
 907                             elem->data[3] == 0x04) {
 908                                 lbs_deb_scan("got mesh IE\n");
 909                                 bss->mesh = 1;
 910                         } else {
 911                                 lbs_deb_scan("got generiec IE: "
 912                                         "%02x:%02x:%02x:%02x, len %d\n",
 913                                         elem->data[0], elem->data[1],
 914                                         elem->data[2], elem->data[3],
 915                                         elem->len);
 916                         }
 917                         break;
 918
 919                 case MFIE_TYPE_RSN:
 920                         lbs_deb_scan("got RSN IE\n");
 921                         bss->rsn_ie_len = min(elem->len + 2, MAX_WPA_IE_LEN);
 922                         memcpy(bss->rsn_ie, elem, bss->rsn_ie_len);
 923                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: RSN_IE",
 924                                 bss->rsn_ie, elem->len);
 925                         break;
 926
 927                 default:
 928                         lbs_deb_scan("got IE 0x%04x, len %d\n",
 929                                 elem->id, elem->len);
 930                         break;
 931                 }
 932
 933                 pos += elem->len + 2;
 934         }
 935
 936         /* Timestamp */
 937         bss->last_scanned = jiffies;
 938         lbs_unset_basic_rate_flags(bss->rates, sizeof(bss->rates));
 939
 940         ret = 0;
 941
 942 done:
 943         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 944         return ret;
 945 }
 946
 947 /**
 948  *  @brief This function finds a specific compatible BSSID in the scan list
 949  *
 950  *  Used in association code
 951  *
 952  *  @param priv  A pointer to struct lbs_private
 953  *  @param bssid    BSSID to find in the scan list
 954  *  @param mode     Network mode: Infrastructure or IBSS
 955  *
 956  *  @return         index in BSSID list, or error return code (< 0)
 957  */
 958 struct bss_descriptor *lbs_find_bssid_in_list(struct lbs_private *priv,
 959                 u8 * bssid, u8 mode)
 960 {
 961         struct bss_descriptor * iter_bss;
 962         struct bss_descriptor * found_bss = NULL;
 963
 964         lbs_deb_enter(LBS_DEB_SCAN);
 965
 966         if (!bssid)
 967                 goto out;
 968
 969         lbs_deb_hex(LBS_DEB_SCAN, "looking for",
 970                 bssid, ETH_ALEN);
 971
 972         /* Look through the scan table for a compatible match.  The loop will
 973          *   continue past a matched bssid that is not compatible in case there
 974          *   is an AP with multiple SSIDs assigned to the same BSSID
 975          */
 976         mutex_lock(&priv->lock);
 977         list_for_each_entry (iter_bss, &priv->network_list, list) {
 978                 if (compare_ether_addr(iter_bss->bssid, bssid))
 979                         continue; /* bssid doesn't match */
 980                 switch (mode) {
 981                 case IW_MODE_INFRA:
 982                 case IW_MODE_ADHOC:
 983                         if (!is_network_compatible(priv, iter_bss, mode))
 984                                 break;
 985                         found_bss = iter_bss;
 986                         break;
 987                 default:
 988                         found_bss = iter_bss;
 989                         break;
 990                 }
 991         }
 992         mutex_unlock(&priv->lock);
 993
 994 out:
 995         lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss);
 996         return found_bss;
 997 }
 998
 999 /**
1000  *  @brief This function finds ssid in ssid list.
1001  *
1002  *  Used in association code
1003  *
1004  *  @param priv  A pointer to struct lbs_private
1005  *  @param ssid     SSID to find in the list
1006  *  @param bssid    BSSID to qualify the SSID selection (if provided)
1007  *  @param mode     Network mode: Infrastructure or IBSS
1008  *
1009  *  @return         index in BSSID list
1010  */
1011 struct bss_descriptor *lbs_find_ssid_in_list(struct lbs_private *priv,
1012                    u8 *ssid, u8 ssid_len, u8 * bssid, u8 mode,
1013                    int channel)
1014 {
1015         u8 bestrssi = 0;
1016         struct bss_descriptor * iter_bss = NULL;
1017         struct bss_descriptor * found_bss = NULL;
1018         struct bss_descriptor * tmp_oldest = NULL;
1019
1020         lbs_deb_enter(LBS_DEB_SCAN);
1021
1022         mutex_lock(&priv->lock);
1023
1024         list_for_each_entry (iter_bss, &priv->network_list, list) {
1025                 if (   !tmp_oldest
1026                     || (iter_bss->last_scanned < tmp_oldest->last_scanned))
1027                         tmp_oldest = iter_bss;
1028
1029                 if (lbs_ssid_cmp(iter_bss->ssid, iter_bss->ssid_len,
1030                                       ssid, ssid_len) != 0)
1031                         continue; /* ssid doesn't match */
1032                 if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
1033                         continue; /* bssid doesn't match */
1034                 if ((channel > 0) && (iter_bss->channel != channel))
1035                         continue; /* channel doesn't match */
1036
1037                 switch (mode) {
1038                 case IW_MODE_INFRA:
1039                 case IW_MODE_ADHOC:
1040                         if (!is_network_compatible(priv, iter_bss, mode))
1041                                 break;
1042
1043                         if (bssid) {
1044                                 /* Found requested BSSID */
1045                                 found_bss = iter_bss;
1046                                 goto out;
1047                         }
1048
1049                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1050                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1051                                 found_bss = iter_bss;
1052                         }
1053                         break;
1054                 case IW_MODE_AUTO:
1055                 default:
1056                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1057                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1058                                 found_bss = iter_bss;
1059                         }
1060                         break;
1061                 }
1062         }
1063
1064 out:
1065         mutex_unlock(&priv->lock);
1066         lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss);
1067         return found_bss;
1068 }
1069
1070 /**
1071  *  @brief This function finds the best SSID in the Scan List
1072  *
1073  *  Search the scan table for the best SSID that also matches the current
1074  *   adapter network preference (infrastructure or adhoc)
1075  *
1076  *  @param priv  A pointer to struct lbs_private
1077  *
1078  *  @return         index in BSSID list
1079  */
1080 static struct bss_descriptor *lbs_find_best_ssid_in_list(
1081         struct lbs_private *priv,
1082         u8 mode)
1083 {
1084         u8 bestrssi = 0;
1085         struct bss_descriptor * iter_bss;
1086         struct bss_descriptor * best_bss = NULL;
1087
1088         lbs_deb_enter(LBS_DEB_SCAN);
1089
1090         mutex_lock(&priv->lock);
1091
1092         list_for_each_entry (iter_bss, &priv->network_list, list) {
1093                 switch (mode) {
1094                 case IW_MODE_INFRA:
1095                 case IW_MODE_ADHOC:
1096                         if (!is_network_compatible(priv, iter_bss, mode))
1097                                 break;
1098                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1099                                 break;
1100                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1101                         best_bss = iter_bss;
1102                         break;
1103                 case IW_MODE_AUTO:
1104                 default:
1105                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1106                                 break;
1107                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1108                         best_bss = iter_bss;
1109                         break;
1110                 }
1111         }
1112
1113         mutex_unlock(&priv->lock);
1114         lbs_deb_leave_args(LBS_DEB_SCAN, "best_bss %p", best_bss);
1115         return best_bss;
1116 }
1117
1118 /**
1119  *  @brief Find the AP with specific ssid in the scan list
1120  *
1121  *  Used from association worker.
1122  *
1123  *  @param priv         A pointer to struct lbs_private structure
1124  *  @param pSSID        A pointer to AP's ssid
1125  *
1126  *  @return             0--success, otherwise--fail
1127  */
1128 int lbs_find_best_network_ssid(struct lbs_private *priv,
1129                 u8 *out_ssid, u8 *out_ssid_len, u8 preferred_mode, u8 *out_mode)
1130 {
1131         int ret = -1;
1132         struct bss_descriptor * found;
1133
1134         lbs_deb_enter(LBS_DEB_SCAN);
1135
1136         lbs_scan_networks(priv, NULL, 1);
1137         if (priv->surpriseremoved)
1138                 goto out;
1139
1140         found = lbs_find_best_ssid_in_list(priv, preferred_mode);
1141         if (found && (found->ssid_len > 0)) {
1142                 memcpy(out_ssid, &found->ssid, IW_ESSID_MAX_SIZE);
1143                 *out_ssid_len = found->ssid_len;
1144                 *out_mode = found->mode;
1145                 ret = 0;
1146         }
1147
1148 out:
1149         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1150         return ret;
1151 }
1152
1153
1154 /**
1155  *  @brief Send a scan command for all available channels filtered on a spec
1156  *
1157  *  Used in association code and from debugfs
1158  *
1159  *  @param priv             A pointer to struct lbs_private structure
1160  *  @param ssid             A pointer to the SSID to scan for
1161  *  @param ssid_len         Length of the SSID
1162  *  @param clear_ssid       Should existing scan results with this SSID
1163  *                          be cleared?
1164  *
1165  *  @return                0-success, otherwise fail
1166  */
1167 int lbs_send_specific_ssid_scan(struct lbs_private *priv,
1168                         u8 *ssid, u8 ssid_len, u8 clear_ssid)
1169 {
1170         struct lbs_ioctl_user_scan_cfg scancfg;
1171         int ret = 0;
1172
1173         lbs_deb_enter_args(LBS_DEB_SCAN, "SSID '%s', clear %d",
1174                 escape_essid(ssid, ssid_len), clear_ssid);
1175
1176         if (!ssid_len)
1177                 goto out;
1178
1179         memset(&scancfg, 0x00, sizeof(scancfg));
1180         memcpy(scancfg.ssid, ssid, ssid_len);
1181         scancfg.ssid_len = ssid_len;
1182         scancfg.clear_ssid = clear_ssid;
1183
1184         lbs_scan_networks(priv, &scancfg, 1);
1185         if (priv->surpriseremoved) {
1186                 ret = -1;
1187                 goto out;
1188         }
1189
1190 out:
1191         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1192         return ret;
1193 }
1194
1195
1196
1197
1198 /*********************************************************************/
1199 /*                                                                   */
1200 /*  Support for Wireless Extensions                                  */
1201 /*                                                                   */
1202 /*********************************************************************/
1203
1204
1205 #define MAX_CUSTOM_LEN 64
1206
1207 static inline char *lbs_translate_scan(struct lbs_private *priv,
1208                                         char *start, char *stop,
1209                                         struct bss_descriptor *bss)
1210 {
1211         struct chan_freq_power *cfp;
1212         char *current_val;      /* For rates */
1213         struct iw_event iwe;    /* Temporary buffer */
1214         int j;
1215 #define PERFECT_RSSI ((u8)50)
1216 #define WORST_RSSI   ((u8)0)
1217 #define RSSI_DIFF    ((u8)(PERFECT_RSSI - WORST_RSSI))
1218         u8 rssi;
1219
1220         lbs_deb_enter(LBS_DEB_SCAN);
1221
1222         cfp = lbs_find_cfp_by_band_and_channel(priv, 0, bss->channel);
1223         if (!cfp) {
1224                 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1225                 start = NULL;
1226                 goto out;
1227         }
1228
1229         /* First entry *MUST* be the BSSID */
1230         iwe.cmd = SIOCGIWAP;
1231         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1232         memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1233         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1234
1235         /* SSID */
1236         iwe.cmd = SIOCGIWESSID;
1237         iwe.u.data.flags = 1;
1238         iwe.u.data.length = min((u32) bss->ssid_len, (u32) IW_ESSID_MAX_SIZE);
1239         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1240
1241         /* Mode */
1242         iwe.cmd = SIOCGIWMODE;
1243         iwe.u.mode = bss->mode;
1244         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1245
1246         /* Frequency */
1247         iwe.cmd = SIOCGIWFREQ;
1248         iwe.u.freq.m = (long)cfp->freq * 100000;
1249         iwe.u.freq.e = 1;
1250         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1251
1252         /* Add quality statistics */
1253         iwe.cmd = IWEVQUAL;
1254         iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1255         iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1256
1257         rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1258         iwe.u.qual.qual =
1259             (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1260              (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1261             (RSSI_DIFF * RSSI_DIFF);
1262         if (iwe.u.qual.qual > 100)
1263                 iwe.u.qual.qual = 100;
1264
1265         if (priv->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1266                 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1267         } else {
1268                 iwe.u.qual.noise =
1269                     CAL_NF(priv->NF[TYPE_BEACON][TYPE_NOAVG]);
1270         }
1271
1272         /* Locally created ad-hoc BSSs won't have beacons if this is the
1273          * only station in the adhoc network; so get signal strength
1274          * from receive statistics.
1275          */
1276         if ((priv->mode == IW_MODE_ADHOC)
1277             && priv->adhoccreate
1278             && !lbs_ssid_cmp(priv->curbssparams.ssid,
1279                                   priv->curbssparams.ssid_len,
1280                                   bss->ssid, bss->ssid_len)) {
1281                 int snr, nf;
1282                 snr = priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1283                 nf = priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1284                 iwe.u.qual.level = CAL_RSSI(snr, nf);
1285         }
1286         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
1287
1288         /* Add encryption capability */
1289         iwe.cmd = SIOCGIWENCODE;
1290         if (bss->capability & WLAN_CAPABILITY_PRIVACY) {
1291                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1292         } else {
1293                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1294         }
1295         iwe.u.data.length = 0;
1296         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1297
1298         current_val = start + IW_EV_LCP_LEN;
1299
1300         iwe.cmd = SIOCGIWRATE;
1301         iwe.u.bitrate.fixed = 0;
1302         iwe.u.bitrate.disabled = 0;
1303         iwe.u.bitrate.value = 0;
1304
1305         for (j = 0; bss->rates[j] && (j < sizeof(bss->rates)); j++) {
1306                 /* Bit rate given in 500 kb/s units */
1307                 iwe.u.bitrate.value = bss->rates[j] * 500000;
1308                 current_val = iwe_stream_add_value(start, current_val,
1309                                          stop, &iwe, IW_EV_PARAM_LEN);
1310         }
1311         if ((bss->mode == IW_MODE_ADHOC)
1312             && !lbs_ssid_cmp(priv->curbssparams.ssid,
1313                                   priv->curbssparams.ssid_len,
1314                                   bss->ssid, bss->ssid_len)
1315             && priv->adhoccreate) {
1316                 iwe.u.bitrate.value = 22 * 500000;
1317                 current_val = iwe_stream_add_value(start, current_val,
1318                                          stop, &iwe, IW_EV_PARAM_LEN);
1319         }
1320         /* Check if we added any event */
1321         if((current_val - start) > IW_EV_LCP_LEN)
1322                 start = current_val;
1323
1324         memset(&iwe, 0, sizeof(iwe));
1325         if (bss->wpa_ie_len) {
1326                 char buf[MAX_WPA_IE_LEN];
1327                 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1328                 iwe.cmd = IWEVGENIE;
1329                 iwe.u.data.length = bss->wpa_ie_len;
1330                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1331         }
1332
1333         memset(&iwe, 0, sizeof(iwe));
1334         if (bss->rsn_ie_len) {
1335                 char buf[MAX_WPA_IE_LEN];
1336                 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1337                 iwe.cmd = IWEVGENIE;
1338                 iwe.u.data.length = bss->rsn_ie_len;
1339                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1340         }
1341
1342         if (bss->mesh) {
1343                 char custom[MAX_CUSTOM_LEN];
1344                 char *p = custom;
1345
1346                 iwe.cmd = IWEVCUSTOM;
1347                 p += snprintf(p, MAX_CUSTOM_LEN - (p - custom),
1348                               "mesh-type: olpc");
1349                 iwe.u.data.length = p - custom;
1350                 if (iwe.u.data.length)
1351                         start = iwe_stream_add_point(start, stop, &iwe, custom);
1352         }
1353
1354 out:
1355         lbs_deb_leave_args(LBS_DEB_SCAN, "start %p", start);
1356         return start;
1357 }
1358
1359
1360 /**
1361  *  @brief Handle Scan Network ioctl
1362  *
1363  *  @param dev          A pointer to net_device structure
1364  *  @param info         A pointer to iw_request_info structure
1365  *  @param vwrq         A pointer to iw_param structure
1366  *  @param extra        A pointer to extra data buf
1367  *
1368  *  @return             0 --success, otherwise fail
1369  */
1370 int lbs_set_scan(struct net_device *dev, struct iw_request_info *info,
1371                   struct iw_param *wrqu, char *extra)
1372 {
1373         struct lbs_private *priv = dev->priv;
1374
1375         lbs_deb_enter(LBS_DEB_SCAN);
1376
1377         if (!netif_running(dev))
1378                 return -ENETDOWN;
1379
1380         /* mac80211 does this:
1381         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1382         if (sdata->type != IEEE80211_IF_TYPE_xxx)
1383                 return -EOPNOTSUPP;
1384
1385         if (wrqu->data.length == sizeof(struct iw_scan_req) &&
1386             wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1387                 req = (struct iw_scan_req *)extra;
1388                         ssid = req->essid;
1389                 ssid_len = req->essid_len;
1390         }
1391         */
1392
1393         if (!delayed_work_pending(&priv->scan_work))
1394                 queue_delayed_work(priv->work_thread, &priv->scan_work,
1395                         msecs_to_jiffies(50));
1396         /* set marker that currently a scan is taking place */
1397         priv->scan_channel = -1;
1398
1399         if (priv->surpriseremoved)
1400                 return -EIO;
1401
1402         lbs_deb_leave(LBS_DEB_SCAN);
1403         return 0;
1404 }
1405
1406
1407 /**
1408  *  @brief  Handle Retrieve scan table ioctl
1409  *
1410  *  @param dev          A pointer to net_device structure
1411  *  @param info         A pointer to iw_request_info structure
1412  *  @param dwrq         A pointer to iw_point structure
1413  *  @param extra        A pointer to extra data buf
1414  *
1415  *  @return             0 --success, otherwise fail
1416  */
1417 int lbs_get_scan(struct net_device *dev, struct iw_request_info *info,
1418                   struct iw_point *dwrq, char *extra)
1419 {
1420 #define SCAN_ITEM_SIZE 128
1421         struct lbs_private *priv = dev->priv;
1422         int err = 0;
1423         char *ev = extra;
1424         char *stop = ev + dwrq->length;
1425         struct bss_descriptor * iter_bss;
1426         struct bss_descriptor * safe;
1427
1428         lbs_deb_enter(LBS_DEB_SCAN);
1429
1430         /* iwlist should wait until the current scan is finished */
1431         if (priv->scan_channel)
1432                 return -EAGAIN;
1433
1434         /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1435         if ((priv->mode == IW_MODE_ADHOC) && priv->adhoccreate) {
1436                 lbs_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
1437                                         CMD_OPTION_WAITFORRSP, 0, NULL);
1438         }
1439
1440         mutex_lock(&priv->lock);
1441         list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) {
1442                 char * next_ev;
1443                 unsigned long stale_time;
1444
1445                 if (stop - ev < SCAN_ITEM_SIZE) {
1446                         err = -E2BIG;
1447                         break;
1448                 }
1449
1450                 /* For mesh device, list only mesh networks */
1451                 if (dev == priv->mesh_dev && !iter_bss->mesh)
1452                         continue;
1453
1454                 /* Prune old an old scan result */
1455                 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1456                 if (time_after(jiffies, stale_time)) {
1457                         list_move_tail (&iter_bss->list,
1458                                         &priv->network_free_list);
1459                         clear_bss_descriptor(iter_bss);
1460                         continue;
1461                 }
1462
1463                 /* Translate to WE format this entry */
1464                 next_ev = lbs_translate_scan(priv, ev, stop, iter_bss);
1465                 if (next_ev == NULL)
1466                         continue;
1467                 ev = next_ev;
1468         }
1469         mutex_unlock(&priv->lock);
1470
1471         dwrq->length = (ev - extra);
1472         dwrq->flags = 0;
1473
1474         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", err);
1475         return err;
1476 }
1477
1478
1479
1480
1481 /*********************************************************************/
1482 /*                                                                   */
1483 /*  Command execution                                                */
1484 /*                                                                   */
1485 /*********************************************************************/
1486
1487
1488 /**
1489  *  @brief This function handles the command response of scan
1490  *
1491  *  Called from handle_cmd_response() in cmdrespc.
1492  *
1493  *   The response buffer for the scan command has the following
1494  *      memory layout:
1495  *
1496  *     .-----------------------------------------------------------.
1497  *     |  header (4 * sizeof(u16)):  Standard command response hdr |
1498  *     .-----------------------------------------------------------.
1499  *     |  bufsize (u16) : sizeof the BSS Description data          |
1500  *     .-----------------------------------------------------------.
1501  *     |  NumOfSet (u8) : Number of BSS Descs returned             |
1502  *     .-----------------------------------------------------------.
1503  *     |  BSSDescription data (variable, size given in bufsize)    |
1504  *     .-----------------------------------------------------------.
1505  *     |  TLV data (variable, size calculated using header->size,  |
1506  *     |            bufsize and sizeof the fixed fields above)     |
1507  *     .-----------------------------------------------------------.
1508  *
1509  *  @param priv    A pointer to struct lbs_private structure
1510  *  @param resp    A pointer to cmd_ds_command
1511  *
1512  *  @return        0 or -1
1513  */
1514 static int lbs_ret_80211_scan(struct lbs_private *priv, unsigned long dummy,
1515                               struct cmd_header *resp)
1516 {
1517         struct cmd_ds_802_11_scan_rsp *scanresp = (void *)resp;
1518         struct bss_descriptor * iter_bss;
1519         struct bss_descriptor * safe;
1520         uint8_t *bssinfo;
1521         uint16_t scanrespsize;
1522         int bytesleft;
1523         int idx;
1524         int tlvbufsize;
1525         int ret;
1526
1527         lbs_deb_enter(LBS_DEB_SCAN);
1528
1529         /* Prune old entries from scan table */
1530         list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) {
1531                 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1532                 if (time_before(jiffies, stale_time))
1533                         continue;
1534                 list_move_tail (&iter_bss->list, &priv->network_free_list);
1535                 clear_bss_descriptor(iter_bss);
1536         }
1537
1538         if (scanresp->nr_sets > MAX_NETWORK_COUNT) {
1539                 lbs_deb_scan("SCAN_RESP: too many scan results (%d, max %d)\n",
1540                              scanresp->nr_sets, MAX_NETWORK_COUNT);
1541                 ret = -1;
1542                 goto done;
1543         }
1544
1545         bytesleft = le16_to_cpu(scanresp->bssdescriptsize);
1546         lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1547
1548         scanrespsize = le16_to_cpu(resp->size);
1549         lbs_deb_scan("SCAN_RESP: scan results %d\n", scanresp->nr_sets);
1550
1551         bssinfo = scanresp->bssdesc_and_tlvbuffer;
1552
1553         /* The size of the TLV buffer is equal to the entire command response
1554          *   size (scanrespsize) minus the fixed fields (sizeof()'s), the
1555          *   BSS Descriptions (bssdescriptsize as bytesLef) and the command
1556          *   response header (S_DS_GEN)
1557          */
1558         tlvbufsize = scanrespsize - (bytesleft + sizeof(scanresp->bssdescriptsize)
1559                                      + sizeof(scanresp->nr_sets)
1560                                      + S_DS_GEN);
1561
1562         /*
1563          *  Process each scan response returned (scanresp->nr_sets). Save
1564          *    the information in the newbssentry and then insert into the
1565          *    driver scan table either as an update to an existing entry
1566          *    or as an addition at the end of the table
1567          */
1568         for (idx = 0; idx < scanresp->nr_sets && bytesleft; idx++) {
1569                 struct bss_descriptor new;
1570                 struct bss_descriptor *found = NULL;
1571                 struct bss_descriptor *oldest = NULL;
1572                 DECLARE_MAC_BUF(mac);
1573
1574                 /* Process the data fields and IEs returned for this BSS */
1575                 memset(&new, 0, sizeof (struct bss_descriptor));
1576                 if (lbs_process_bss(&new, &bssinfo, &bytesleft) != 0) {
1577                         /* error parsing the scan response, skipped */
1578                         lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1579                         continue;
1580                 }
1581
1582                 /* Try to find this bss in the scan table */
1583                 list_for_each_entry (iter_bss, &priv->network_list, list) {
1584                         if (is_same_network(iter_bss, &new)) {
1585                                 found = iter_bss;
1586                                 break;
1587                         }
1588
1589                         if ((oldest == NULL) ||
1590                             (iter_bss->last_scanned < oldest->last_scanned))
1591                                 oldest = iter_bss;
1592                 }
1593
1594                 if (found) {
1595                         /* found, clear it */
1596                         clear_bss_descriptor(found);
1597                 } else if (!list_empty(&priv->network_free_list)) {
1598                         /* Pull one from the free list */
1599                         found = list_entry(priv->network_free_list.next,
1600                                            struct bss_descriptor, list);
1601                         list_move_tail(&found->list, &priv->network_list);
1602                 } else if (oldest) {
1603                         /* If there are no more slots, expire the oldest */
1604                         found = oldest;
1605                         clear_bss_descriptor(found);
1606                         list_move_tail(&found->list, &priv->network_list);
1607                 } else {
1608                         continue;
1609                 }
1610
1611                 lbs_deb_scan("SCAN_RESP: BSSID %s\n", print_mac(mac, new.bssid));
1612
1613                 /* Copy the locally created newbssentry to the scan table */
1614                 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1615         }
1616
1617         ret = 0;
1618
1619 done:
1620         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1621         return ret;
1622 }