git.oblomov.eu 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 "host.h"
  17 #include "decl.h"
  18 #include "dev.h"
  19 #include "scan.h"
  20
  21 //! Approximate amount of data needed to pass a scan result back to iwlist
  22 #define MAX_SCAN_CELL_SIZE  (IW_EV_ADDR_LEN             \
  23                              + IW_ESSID_MAX_SIZE        \
  24                              + IW_EV_UINT_LEN           \
  25                              + IW_EV_FREQ_LEN           \
  26                              + IW_EV_QUAL_LEN           \
  27                              + IW_ESSID_MAX_SIZE        \
  28                              + IW_EV_PARAM_LEN          \
  29                              + 40)      /* 40 for WPAIE */
  30
  31 //! Memory needed to store a max sized channel List TLV for a firmware scan
  32 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mrvlietypesheader)    \
  33                             + (MRVDRV_MAX_CHANNELS_PER_SCAN     \
  34                                * sizeof(struct chanscanparamset)))
  35
  36 //! Memory needed to store a max number/size SSID TLV for a firmware scan
  37 #define SSID_TLV_MAX_SIZE  (1 * sizeof(struct mrvlietypes_ssidparamset))
  38
  39 //! Maximum memory needed for a wlan_scan_cmd_config with all TLVs at max
  40 #define MAX_SCAN_CFG_ALLOC (sizeof(struct wlan_scan_cmd_config)  \
  41                             + sizeof(struct mrvlietypes_numprobes)   \
  42                             + CHAN_TLV_MAX_SIZE                 \
  43                             + SSID_TLV_MAX_SIZE)
  44
  45 //! The maximum number of channels the firmware can scan per command
  46 #define MRVDRV_MAX_CHANNELS_PER_SCAN   14
  47
  48 /**
  49  * @brief Number of channels to scan per firmware scan command issuance.
  50  *
  51  *  Number restricted to prevent hitting the limit on the amount of scan data
  52  *  returned in a single firmware scan command.
  53  */
  54 #define MRVDRV_CHANNELS_PER_SCAN_CMD   4
  55
  56 //! Scan time specified in the channel TLV for each channel for passive scans
  57 #define MRVDRV_PASSIVE_SCAN_CHAN_TIME  100
  58
  59 //! Scan time specified in the channel TLV for each channel for active scans
  60 #define MRVDRV_ACTIVE_SCAN_CHAN_TIME   100
  61
  62 static const u8 zeromac[ETH_ALEN] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
  63 static const u8 bcastmac[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  64
  65 static inline void clear_bss_descriptor (struct bss_descriptor * bss)
  66 {
  67         /* Don't blow away ->list, just BSS data */
  68         memset(bss, 0, offsetof(struct bss_descriptor, list));
  69 }
  70
  71 static inline int match_bss_no_security(struct wlan_802_11_security * secinfo,
  72                         struct bss_descriptor * match_bss)
  73 {
  74         if (   !secinfo->wep_enabled
  75             && !secinfo->WPAenabled
  76             && !secinfo->WPA2enabled
  77             && match_bss->wpa_ie[0] != WPA_IE
  78             && match_bss->rsn_ie[0] != WPA2_IE
  79             && !match_bss->privacy) {
  80                 return 1;
  81         }
  82         return 0;
  83 }
  84
  85 static inline int match_bss_static_wep(struct wlan_802_11_security * secinfo,
  86                         struct bss_descriptor * match_bss)
  87 {
  88         if ( secinfo->wep_enabled
  89            && !secinfo->WPAenabled
  90            && !secinfo->WPA2enabled
  91            && match_bss->privacy) {
  92                 return 1;
  93         }
  94         return 0;
  95 }
  96
  97 static inline int match_bss_wpa(struct wlan_802_11_security * secinfo,
  98                         struct bss_descriptor * match_bss)
  99 {
 100         if (  !secinfo->wep_enabled
 101            && secinfo->WPAenabled
 102            && (match_bss->wpa_ie[0] == WPA_IE)
 103            /* privacy bit may NOT be set in some APs like LinkSys WRT54G
 104               && bss->privacy */
 105            ) {
 106                 return 1;
 107         }
 108         return 0;
 109 }
 110
 111 static inline int match_bss_wpa2(struct wlan_802_11_security * secinfo,
 112                         struct bss_descriptor * match_bss)
 113 {
 114         if (  !secinfo->wep_enabled
 115            && secinfo->WPA2enabled
 116            && (match_bss->rsn_ie[0] == WPA2_IE)
 117            /* privacy bit may NOT be set in some APs like LinkSys WRT54G
 118               && bss->privacy */
 119            ) {
 120                 return 1;
 121         }
 122         return 0;
 123 }
 124
 125 static inline int match_bss_dynamic_wep(struct wlan_802_11_security * secinfo,
 126                         struct bss_descriptor * match_bss)
 127 {
 128         if (  !secinfo->wep_enabled
 129            && !secinfo->WPAenabled
 130            && !secinfo->WPA2enabled
 131            && (match_bss->wpa_ie[0] != WPA_IE)
 132            && (match_bss->rsn_ie[0] != WPA2_IE)
 133            && match_bss->privacy) {
 134                 return 1;
 135         }
 136         return 0;
 137 }
 138
 139 /**
 140  *  @brief Check if a scanned network compatible with the driver settings
 141  *
 142  *   WEP     WPA     WPA2    ad-hoc  encrypt                      Network
 143  * enabled enabled  enabled   AES     mode   privacy  WPA  WPA2  Compatible
 144  *    0       0        0       0      NONE      0      0    0   yes No security
 145  *    1       0        0       0      NONE      1      0    0   yes Static WEP
 146  *    0       1        0       0       x        1x     1    x   yes WPA
 147  *    0       0        1       0       x        1x     x    1   yes WPA2
 148  *    0       0        0       1      NONE      1      0    0   yes Ad-hoc AES
 149  *    0       0        0       0     !=NONE     1      0    0   yes Dynamic WEP
 150  *
 151  *
 152  *  @param adapter A pointer to wlan_adapter
 153  *  @param index   Index in scantable to check against current driver settings
 154  *  @param mode    Network mode: Infrastructure or IBSS
 155  *
 156  *  @return        Index in scantable, or error code if negative
 157  */
 158 static int is_network_compatible(wlan_adapter * adapter,
 159                 struct bss_descriptor * bss, u8 mode)
 160 {
 161         int matched = 0;
 162
 163         lbs_deb_enter(LBS_DEB_ASSOC);
 164
 165         if (bss->mode != mode)
 166                 goto done;
 167
 168         if ((matched = match_bss_no_security(&adapter->secinfo, bss))) {
 169                 goto done;
 170         } else if ((matched = match_bss_static_wep(&adapter->secinfo, bss))) {
 171                 goto done;
 172         } else if ((matched = match_bss_wpa(&adapter->secinfo, bss))) {
 173                 lbs_deb_scan(
 174                        "is_network_compatible() WPA: wpa_ie=%#x "
 175                        "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 176                        "privacy=%#x\n", bss->wpa_ie[0], bss->rsn_ie[0],
 177                        adapter->secinfo.wep_enabled ? "e" : "d",
 178                        adapter->secinfo.WPAenabled ? "e" : "d",
 179                        adapter->secinfo.WPA2enabled ? "e" : "d",
 180                        bss->privacy);
 181                 goto done;
 182         } else if ((matched = match_bss_wpa2(&adapter->secinfo, bss))) {
 183                 lbs_deb_scan(
 184                        "is_network_compatible() WPA2: wpa_ie=%#x "
 185                        "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 186                        "privacy=%#x\n", bss->wpa_ie[0], bss->rsn_ie[0],
 187                        adapter->secinfo.wep_enabled ? "e" : "d",
 188                        adapter->secinfo.WPAenabled ? "e" : "d",
 189                        adapter->secinfo.WPA2enabled ? "e" : "d",
 190                        bss->privacy);
 191                 goto done;
 192         } else if ((matched = match_bss_dynamic_wep(&adapter->secinfo, bss))) {
 193                 lbs_deb_scan(
 194                        "is_network_compatible() dynamic WEP: "
 195                        "wpa_ie=%#x wpa2_ie=%#x privacy=%#x\n",
 196                        bss->wpa_ie[0],
 197                        bss->rsn_ie[0],
 198                        bss->privacy);
 199                 goto done;
 200         }
 201
 202         /* bss security settings don't match those configured on card */
 203         lbs_deb_scan(
 204                "is_network_compatible() FAILED: wpa_ie=%#x "
 205                "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s privacy=%#x\n",
 206                bss->wpa_ie[0], bss->rsn_ie[0],
 207                adapter->secinfo.wep_enabled ? "e" : "d",
 208                adapter->secinfo.WPAenabled ? "e" : "d",
 209                adapter->secinfo.WPA2enabled ? "e" : "d",
 210                bss->privacy);
 211
 212 done:
 213         lbs_deb_leave(LBS_DEB_SCAN);
 214         return matched;
 215 }
 216
 217 /**
 218  *  @brief Create a channel list for the driver to scan based on region info
 219  *
 220  *  Use the driver region/band information to construct a comprehensive list
 221  *    of channels to scan.  This routine is used for any scan that is not
 222  *    provided a specific channel list to scan.
 223  *
 224  *  @param priv          A pointer to wlan_private structure
 225  *  @param scanchanlist  Output parameter: resulting channel list to scan
 226  *  @param filteredscan  Flag indicating whether or not a BSSID or SSID filter
 227  *                       is being sent in the command to firmware.  Used to
 228  *                       increase the number of channels sent in a scan
 229  *                       command and to disable the firmware channel scan
 230  *                       filter.
 231  *
 232  *  @return              void
 233  */
 234 static void wlan_scan_create_channel_list(wlan_private * priv,
 235                                           struct chanscanparamset * scanchanlist,
 236                                           u8 filteredscan)
 237 {
 238
 239         wlan_adapter *adapter = priv->adapter;
 240         struct region_channel *scanregion;
 241         struct chan_freq_power *cfp;
 242         int rgnidx;
 243         int chanidx;
 244         int nextchan;
 245         u8 scantype;
 246
 247         chanidx = 0;
 248
 249         /* Set the default scan type to the user specified type, will later
 250          *   be changed to passive on a per channel basis if restricted by
 251          *   regulatory requirements (11d or 11h)
 252          */
 253         scantype = adapter->scantype;
 254
 255         for (rgnidx = 0; rgnidx < ARRAY_SIZE(adapter->region_channel); rgnidx++) {
 256                 if (priv->adapter->enable11d &&
 257                     adapter->connect_status != libertas_connected) {
 258                         /* Scan all the supported chan for the first scan */
 259                         if (!adapter->universal_channel[rgnidx].valid)
 260                                 continue;
 261                         scanregion = &adapter->universal_channel[rgnidx];
 262
 263                         /* clear the parsed_region_chan for the first scan */
 264                         memset(&adapter->parsed_region_chan, 0x00,
 265                                sizeof(adapter->parsed_region_chan));
 266                 } else {
 267                         if (!adapter->region_channel[rgnidx].valid)
 268                                 continue;
 269                         scanregion = &adapter->region_channel[rgnidx];
 270                 }
 271
 272                 for (nextchan = 0;
 273                      nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
 274
 275                         cfp = scanregion->CFP + nextchan;
 276
 277                         if (priv->adapter->enable11d) {
 278                                 scantype =
 279                                     libertas_get_scan_type_11d(cfp->channel,
 280                                                            &adapter->
 281                                                            parsed_region_chan);
 282                         }
 283
 284                         switch (scanregion->band) {
 285                         case BAND_B:
 286                         case BAND_G:
 287                         default:
 288                                 scanchanlist[chanidx].radiotype =
 289                                     cmd_scan_radio_type_bg;
 290                                 break;
 291                         }
 292
 293                         if (scantype == cmd_scan_type_passive) {
 294                                 scanchanlist[chanidx].maxscantime =
 295                                     cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
 296                                 scanchanlist[chanidx].chanscanmode.passivescan =
 297                                     1;
 298                         } else {
 299                                 scanchanlist[chanidx].maxscantime =
 300                                     cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
 301                                 scanchanlist[chanidx].chanscanmode.passivescan =
 302                                     0;
 303                         }
 304
 305                         scanchanlist[chanidx].channumber = cfp->channel;
 306
 307                         if (filteredscan) {
 308                                 scanchanlist[chanidx].chanscanmode.
 309                                     disablechanfilt = 1;
 310                         }
 311                 }
 312         }
 313 }
 314
 315 /**
 316  *  @brief Construct a wlan_scan_cmd_config structure to use in issue scan cmds
 317  *
 318  *  Application layer or other functions can invoke wlan_scan_networks
 319  *    with a scan configuration supplied in a wlan_ioctl_user_scan_cfg struct.
 320  *    This structure is used as the basis of one or many wlan_scan_cmd_config
 321  *    commands that are sent to the command processing module and sent to
 322  *    firmware.
 323  *
 324  *  Create a wlan_scan_cmd_config based on the following user supplied
 325  *    parameters (if present):
 326  *             - SSID filter
 327  *             - BSSID filter
 328  *             - Number of Probes to be sent
 329  *             - channel list
 330  *
 331  *  If the SSID or BSSID filter is not present, disable/clear the filter.
 332  *  If the number of probes is not set, use the adapter default setting
 333  *  Qualify the channel
 334  *
 335  *  @param priv             A pointer to wlan_private structure
 336  *  @param puserscanin      NULL or pointer to scan configuration parameters
 337  *  @param ppchantlvout     Output parameter: Pointer to the start of the
 338  *                          channel TLV portion of the output scan config
 339  *  @param pscanchanlist    Output parameter: Pointer to the resulting channel
 340  *                          list to scan
 341  *  @param pmaxchanperscan  Output parameter: Number of channels to scan for
 342  *                          each issuance of the firmware scan command
 343  *  @param pfilteredscan    Output parameter: Flag indicating whether or not
 344  *                          a BSSID or SSID filter is being sent in the
 345  *                          command to firmware.  Used to increase the number
 346  *                          of channels sent in a scan command and to
 347  *                          disable the firmware channel scan filter.
 348  *  @param pscancurrentonly Output parameter: Flag indicating whether or not
 349  *                          we are only scanning our current active channel
 350  *
 351  *  @return                 resulting scan configuration
 352  */
 353 static struct wlan_scan_cmd_config *
 354 wlan_scan_setup_scan_config(wlan_private * priv,
 355                             const struct wlan_ioctl_user_scan_cfg * puserscanin,
 356                             struct mrvlietypes_chanlistparamset ** ppchantlvout,
 357                             struct chanscanparamset * pscanchanlist,
 358                             int *pmaxchanperscan,
 359                             u8 * pfilteredscan,
 360                             u8 * pscancurrentonly)
 361 {
 362         wlan_adapter *adapter = priv->adapter;
 363         struct mrvlietypes_numprobes *pnumprobestlv;
 364         struct mrvlietypes_ssidparamset *pssidtlv;
 365         struct wlan_scan_cmd_config * pscancfgout = NULL;
 366         u8 *ptlvpos;
 367         u16 numprobes;
 368         int chanidx;
 369         int scantype;
 370         int scandur;
 371         int channel;
 372         int radiotype;
 373
 374         pscancfgout = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
 375         if (pscancfgout == NULL)
 376                 goto out;
 377
 378         /* The tlvbufferlen is calculated for each scan command.  The TLVs added
 379          *   in this routine will be preserved since the routine that sends
 380          *   the command will append channelTLVs at *ppchantlvout.  The difference
 381          *   between the *ppchantlvout and the tlvbuffer start will be used
 382          *   to calculate the size of anything we add in this routine.
 383          */
 384         pscancfgout->tlvbufferlen = 0;
 385
 386         /* Running tlv pointer.  Assigned to ppchantlvout at end of function
 387          *  so later routines know where channels can be added to the command buf
 388          */
 389         ptlvpos = pscancfgout->tlvbuffer;
 390
 391         /*
 392          * Set the initial scan paramters for progressive scanning.  If a specific
 393          *   BSSID or SSID is used, the number of channels in the scan command
 394          *   will be increased to the absolute maximum
 395          */
 396         *pmaxchanperscan = MRVDRV_CHANNELS_PER_SCAN_CMD;
 397
 398         /* Initialize the scan as un-filtered by firmware, set to TRUE below if
 399          *   a SSID or BSSID filter is sent in the command
 400          */
 401         *pfilteredscan = 0;
 402
 403         /* Initialize the scan as not being only on the current channel.  If
 404          *   the channel list is customized, only contains one channel, and
 405          *   is the active channel, this is set true and data flow is not halted.
 406          */
 407         *pscancurrentonly = 0;
 408
 409         if (puserscanin) {
 410
 411                 /* Set the bss type scan filter, use adapter setting if unset */
 412                 pscancfgout->bsstype =
 413                     (puserscanin->bsstype ? puserscanin->bsstype : adapter->
 414                      scanmode);
 415
 416                 /* Set the number of probes to send, use adapter setting if unset */
 417                 numprobes = (puserscanin->numprobes ? puserscanin->numprobes :
 418                              adapter->scanprobes);
 419
 420                 /*
 421                  * Set the BSSID filter to the incoming configuration,
 422                  *   if non-zero.  If not set, it will remain disabled (all zeros).
 423                  */
 424                 memcpy(pscancfgout->bssid, puserscanin->bssid,
 425                        sizeof(pscancfgout->bssid));
 426
 427                 if (puserscanin->ssid_len) {
 428                         pssidtlv =
 429                             (struct mrvlietypes_ssidparamset *) pscancfgout->
 430                             tlvbuffer;
 431                         pssidtlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
 432                         pssidtlv->header.len = cpu_to_le16(puserscanin->ssid_len);
 433                         memcpy(pssidtlv->ssid, puserscanin->ssid,
 434                                puserscanin->ssid_len);
 435                         ptlvpos += sizeof(pssidtlv->header) + puserscanin->ssid_len;
 436                 }
 437
 438                 /*
 439                  *  The default number of channels sent in the command is low to
 440                  *    ensure the response buffer from the firmware does not truncate
 441                  *    scan results.  That is not an issue with an SSID or BSSID
 442                  *    filter applied to the scan results in the firmware.
 443                  */
 444                 if (   puserscanin->ssid_len
 445                     || (compare_ether_addr(pscancfgout->bssid, &zeromac[0]) != 0)) {
 446                         *pmaxchanperscan = MRVDRV_MAX_CHANNELS_PER_SCAN;
 447                         *pfilteredscan = 1;
 448                 }
 449         } else {
 450                 pscancfgout->bsstype = adapter->scanmode;
 451                 numprobes = adapter->scanprobes;
 452         }
 453
 454         /* If the input config or adapter has the number of Probes set, add tlv */
 455         if (numprobes) {
 456                 pnumprobestlv = (struct mrvlietypes_numprobes *) ptlvpos;
 457                 pnumprobestlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 458                 pnumprobestlv->header.len = cpu_to_le16(2);
 459                 pnumprobestlv->numprobes = cpu_to_le16(numprobes);
 460
 461                 ptlvpos += sizeof(*pnumprobestlv);
 462         }
 463
 464         /*
 465          * Set the output for the channel TLV to the address in the tlv buffer
 466          *   past any TLVs that were added in this fuction (SSID, numprobes).
 467          *   channel TLVs will be added past this for each scan command, preserving
 468          *   the TLVs that were previously added.
 469          */
 470         *ppchantlvout = (struct mrvlietypes_chanlistparamset *) ptlvpos;
 471
 472         if (puserscanin && puserscanin->chanlist[0].channumber) {
 473
 474                 lbs_deb_scan("Scan: Using supplied channel list\n");
 475
 476                 for (chanidx = 0;
 477                      chanidx < WLAN_IOCTL_USER_SCAN_CHAN_MAX
 478                      && puserscanin->chanlist[chanidx].channumber; chanidx++) {
 479
 480                         channel = puserscanin->chanlist[chanidx].channumber;
 481                         (pscanchanlist + chanidx)->channumber = channel;
 482
 483                         radiotype = puserscanin->chanlist[chanidx].radiotype;
 484                         (pscanchanlist + chanidx)->radiotype = radiotype;
 485
 486                         scantype = puserscanin->chanlist[chanidx].scantype;
 487
 488                         if (scantype == cmd_scan_type_passive) {
 489                                 (pscanchanlist +
 490                                  chanidx)->chanscanmode.passivescan = 1;
 491                         } else {
 492                                 (pscanchanlist +
 493                                  chanidx)->chanscanmode.passivescan = 0;
 494                         }
 495
 496                         if (puserscanin->chanlist[chanidx].scantime) {
 497                                 scandur =
 498                                     puserscanin->chanlist[chanidx].scantime;
 499                         } else {
 500                                 if (scantype == cmd_scan_type_passive) {
 501                                         scandur = MRVDRV_PASSIVE_SCAN_CHAN_TIME;
 502                                 } else {
 503                                         scandur = MRVDRV_ACTIVE_SCAN_CHAN_TIME;
 504                                 }
 505                         }
 506
 507                         (pscanchanlist + chanidx)->minscantime =
 508                             cpu_to_le16(scandur);
 509                         (pscanchanlist + chanidx)->maxscantime =
 510                             cpu_to_le16(scandur);
 511                 }
 512
 513                 /* Check if we are only scanning the current channel */
 514                 if ((chanidx == 1) && (puserscanin->chanlist[0].channumber
 515                                        ==
 516                                        priv->adapter->curbssparams.channel)) {
 517                         *pscancurrentonly = 1;
 518                         lbs_deb_scan("Scan: Scanning current channel only");
 519                 }
 520
 521         } else {
 522                 lbs_deb_scan("Scan: Creating full region channel list\n");
 523                 wlan_scan_create_channel_list(priv, pscanchanlist,
 524                                               *pfilteredscan);
 525         }
 526
 527 out:
 528         return pscancfgout;
 529 }
 530
 531 /**
 532  *  @brief Construct and send multiple scan config commands to the firmware
 533  *
 534  *  Previous routines have created a wlan_scan_cmd_config with any requested
 535  *   TLVs.  This function splits the channel TLV into maxchanperscan lists
 536  *   and sends the portion of the channel TLV along with the other TLVs
 537  *   to the wlan_cmd routines for execution in the firmware.
 538  *
 539  *  @param priv            A pointer to wlan_private structure
 540  *  @param maxchanperscan  Maximum number channels to be included in each
 541  *                         scan command sent to firmware
 542  *  @param filteredscan    Flag indicating whether or not a BSSID or SSID
 543  *                         filter is being used for the firmware command
 544  *                         scan command sent to firmware
 545  *  @param pscancfgout     Scan configuration used for this scan.
 546  *  @param pchantlvout     Pointer in the pscancfgout where the channel TLV
 547  *                         should start.  This is past any other TLVs that
 548  *                         must be sent down in each firmware command.
 549  *  @param pscanchanlist   List of channels to scan in maxchanperscan segments
 550  *
 551  *  @return                0 or error return otherwise
 552  */
 553 static int wlan_scan_channel_list(wlan_private * priv,
 554                                   int maxchanperscan,
 555                                   u8 filteredscan,
 556                                   struct wlan_scan_cmd_config * pscancfgout,
 557                                   struct mrvlietypes_chanlistparamset * pchantlvout,
 558                                   struct chanscanparamset * pscanchanlist,
 559                                   const struct wlan_ioctl_user_scan_cfg * puserscanin,
 560                                   int full_scan)
 561 {
 562         struct chanscanparamset *ptmpchan;
 563         struct chanscanparamset *pstartchan;
 564         u8 scanband;
 565         int doneearly;
 566         int tlvidx;
 567         int ret = 0;
 568         int scanned = 0;
 569         union iwreq_data wrqu;
 570
 571         lbs_deb_enter(LBS_DEB_ASSOC);
 572
 573         if (pscancfgout == 0 || pchantlvout == 0 || pscanchanlist == 0) {
 574                 lbs_deb_scan("Scan: Null detect: %p, %p, %p\n",
 575                        pscancfgout, pchantlvout, pscanchanlist);
 576                 return -1;
 577         }
 578
 579         pchantlvout->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 580
 581         /* Set the temp channel struct pointer to the start of the desired list */
 582         ptmpchan = pscanchanlist;
 583
 584         if (priv->adapter->last_scanned_channel && !puserscanin)
 585                 ptmpchan += priv->adapter->last_scanned_channel;
 586
 587         /* Loop through the desired channel list, sending a new firmware scan
 588          *   commands for each maxchanperscan channels (or for 1,6,11 individually
 589          *   if configured accordingly)
 590          */
 591         while (ptmpchan->channumber) {
 592
 593                 tlvidx = 0;
 594                 pchantlvout->header.len = 0;
 595                 scanband = ptmpchan->radiotype;
 596                 pstartchan = ptmpchan;
 597                 doneearly = 0;
 598
 599                 /* Construct the channel TLV for the scan command.  Continue to
 600                  *  insert channel TLVs until:
 601                  *    - the tlvidx hits the maximum configured per scan command
 602                  *    - the next channel to insert is 0 (end of desired channel list)
 603                  *    - doneearly is set (controlling individual scanning of 1,6,11)
 604                  */
 605                 while (tlvidx < maxchanperscan && ptmpchan->channumber
 606                        && !doneearly && scanned < 2) {
 607
 608             lbs_deb_scan(
 609                     "Scan: Chan(%3d), Radio(%d), mode(%d,%d), Dur(%d)\n",
 610                 ptmpchan->channumber, ptmpchan->radiotype,
 611                 ptmpchan->chanscanmode.passivescan,
 612                 ptmpchan->chanscanmode.disablechanfilt,
 613                 ptmpchan->maxscantime);
 614
 615                         /* Copy the current channel TLV to the command being prepared */
 616                         memcpy(pchantlvout->chanscanparam + tlvidx,
 617                                ptmpchan, sizeof(pchantlvout->chanscanparam));
 618
 619                         /* Increment the TLV header length by the size appended */
 620                         /* Ew, it would be _so_ nice if we could just declare the
 621                            variable little-endian and let GCC handle it for us */
 622                         pchantlvout->header.len =
 623                                 cpu_to_le16(le16_to_cpu(pchantlvout->header.len) +
 624                                             sizeof(pchantlvout->chanscanparam));
 625
 626                         /*
 627                          *  The tlv buffer length is set to the number of bytes of the
 628                          *    between the channel tlv pointer and the start of the
 629                          *    tlv buffer.  This compensates for any TLVs that were appended
 630                          *    before the channel list.
 631                          */
 632                         pscancfgout->tlvbufferlen = ((u8 *) pchantlvout
 633                                                      - pscancfgout->tlvbuffer);
 634
 635                         /*  Add the size of the channel tlv header and the data length */
 636                         pscancfgout->tlvbufferlen +=
 637                             (sizeof(pchantlvout->header)
 638                              + le16_to_cpu(pchantlvout->header.len));
 639
 640                         /* Increment the index to the channel tlv we are constructing */
 641                         tlvidx++;
 642
 643                         doneearly = 0;
 644
 645                         /* Stop the loop if the *current* channel is in the 1,6,11 set
 646                          *   and we are not filtering on a BSSID or SSID.
 647                          */
 648                         if (!filteredscan && (ptmpchan->channumber == 1
 649                                               || ptmpchan->channumber == 6
 650                                               || ptmpchan->channumber == 11)) {
 651                                 doneearly = 1;
 652                         }
 653
 654                         /* Increment the tmp pointer to the next channel to be scanned */
 655                         ptmpchan++;
 656                         scanned++;
 657
 658                         /* Stop the loop if the *next* channel is in the 1,6,11 set.
 659                          *  This will cause it to be the only channel scanned on the next
 660                          *  interation
 661                          */
 662                         if (!filteredscan && (ptmpchan->channumber == 1
 663                                               || ptmpchan->channumber == 6
 664                                               || ptmpchan->channumber == 11)) {
 665                                 doneearly = 1;
 666                         }
 667                 }
 668
 669                 /* Send the scan command to the firmware with the specified cfg */
 670                 ret = libertas_prepare_and_send_command(priv, cmd_802_11_scan, 0,
 671                                             0, 0, pscancfgout);
 672                 if (scanned >= 2 && !full_scan) {
 673                         ret = 0;
 674                         goto done;
 675                 }
 676                 scanned = 0;
 677         }
 678
 679 done:
 680         priv->adapter->last_scanned_channel = ptmpchan->channumber;
 681
 682         /* Tell userspace the scan table has been updated */
 683         memset(&wrqu, 0, sizeof(union iwreq_data));
 684         wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
 685
 686         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 687         return ret;
 688 }
 689
 690 static void
 691 clear_selected_scan_list_entries(wlan_adapter * adapter,
 692                                  const struct wlan_ioctl_user_scan_cfg * scan_cfg)
 693 {
 694         struct bss_descriptor * bss;
 695         struct bss_descriptor * safe;
 696         u32 clear_ssid_flag = 0, clear_bssid_flag = 0;
 697
 698         if (!scan_cfg)
 699                 return;
 700
 701         if (scan_cfg->clear_ssid && scan_cfg->ssid_len)
 702                 clear_ssid_flag = 1;
 703
 704         if (scan_cfg->clear_bssid
 705             && (compare_ether_addr(scan_cfg->bssid, &zeromac[0]) != 0)
 706             && (compare_ether_addr(scan_cfg->bssid, &bcastmac[0]) != 0)) {
 707                 clear_bssid_flag = 1;
 708         }
 709
 710         if (!clear_ssid_flag && !clear_bssid_flag)
 711                 return;
 712
 713         mutex_lock(&adapter->lock);
 714         list_for_each_entry_safe (bss, safe, &adapter->network_list, list) {
 715                 u32 clear = 0;
 716
 717                 /* Check for an SSID match */
 718                 if (   clear_ssid_flag
 719                     && (bss->ssid_len == scan_cfg->ssid_len)
 720                     && !memcmp(bss->ssid, scan_cfg->ssid, bss->ssid_len))
 721                         clear = 1;
 722
 723                 /* Check for a BSSID match */
 724                 if (   clear_bssid_flag
 725                     && !compare_ether_addr(bss->bssid, scan_cfg->bssid))
 726                         clear = 1;
 727
 728                 if (clear) {
 729                         list_move_tail (&bss->list, &adapter->network_free_list);
 730                         clear_bss_descriptor(bss);
 731                 }
 732         }
 733         mutex_unlock(&adapter->lock);
 734 }
 735
 736
 737 /**
 738  *  @brief Internal function used to start a scan based on an input config
 739  *
 740  *  Use the input user scan configuration information when provided in
 741  *    order to send the appropriate scan commands to firmware to populate or
 742  *    update the internal driver scan table
 743  *
 744  *  @param priv          A pointer to wlan_private structure
 745  *  @param puserscanin   Pointer to the input configuration for the requested
 746  *                       scan.
 747  *
 748  *  @return              0 or < 0 if error
 749  */
 750 int wlan_scan_networks(wlan_private * priv,
 751                               const struct wlan_ioctl_user_scan_cfg * puserscanin,
 752                               int full_scan)
 753 {
 754         wlan_adapter * adapter = priv->adapter;
 755         struct mrvlietypes_chanlistparamset *pchantlvout;
 756         struct chanscanparamset * scan_chan_list = NULL;
 757         struct wlan_scan_cmd_config * scan_cfg = NULL;
 758         u8 filteredscan;
 759         u8 scancurrentchanonly;
 760         int maxchanperscan;
 761         int ret;
 762 #ifdef CONFIG_LIBERTAS_DEBUG
 763         struct bss_descriptor * iter_bss;
 764         int i = 0;
 765 #endif
 766
 767         lbs_deb_enter(LBS_DEB_ASSOC);
 768
 769         scan_chan_list = kzalloc(sizeof(struct chanscanparamset) *
 770                                 WLAN_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
 771         if (scan_chan_list == NULL) {
 772                 ret = -ENOMEM;
 773                 goto out;
 774         }
 775
 776         scan_cfg = wlan_scan_setup_scan_config(priv,
 777                                                puserscanin,
 778                                                &pchantlvout,
 779                                                scan_chan_list,
 780                                                &maxchanperscan,
 781                                                &filteredscan,
 782                                                &scancurrentchanonly);
 783         if (scan_cfg == NULL) {
 784                 ret = -ENOMEM;
 785                 goto out;
 786         }
 787
 788         clear_selected_scan_list_entries(adapter, puserscanin);
 789
 790         /* Keep the data path active if we are only scanning our current channel */
 791         if (!scancurrentchanonly) {
 792                 netif_stop_queue(priv->dev);
 793                 netif_carrier_off(priv->dev);
 794                 netif_stop_queue(priv->mesh_dev);
 795                 netif_carrier_off(priv->mesh_dev);
 796         }
 797
 798         ret = wlan_scan_channel_list(priv,
 799                                      maxchanperscan,
 800                                      filteredscan,
 801                                      scan_cfg,
 802                                      pchantlvout,
 803                                      scan_chan_list,
 804                                      puserscanin,
 805                                      full_scan);
 806
 807 #ifdef CONFIG_LIBERTAS_DEBUG
 808         /* Dump the scan table */
 809         mutex_lock(&adapter->lock);
 810         list_for_each_entry (iter_bss, &adapter->network_list, list) {
 811                 lbs_deb_scan("Scan:(%02d) " MAC_FMT ", RSSI[%03d], SSID[%s]\n",
 812                        i++, MAC_ARG(iter_bss->bssid), (s32) iter_bss->rssi,
 813                        escape_essid(iter_bss->ssid, iter_bss->ssid_len));
 814         }
 815         mutex_unlock(&adapter->lock);
 816 #endif
 817
 818         if (priv->adapter->connect_status == libertas_connected) {
 819                 netif_carrier_on(priv->dev);
 820                 netif_wake_queue(priv->dev);
 821                 netif_carrier_on(priv->mesh_dev);
 822                 netif_wake_queue(priv->mesh_dev);
 823         }
 824
 825 out:
 826         if (scan_cfg)
 827                 kfree(scan_cfg);
 828
 829         if (scan_chan_list)
 830                 kfree(scan_chan_list);
 831
 832         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 833         return ret;
 834 }
 835
 836 /**
 837  *  @brief Inspect the scan response buffer for pointers to expected TLVs
 838  *
 839  *  TLVs can be included at the end of the scan response BSS information.
 840  *    Parse the data in the buffer for pointers to TLVs that can potentially
 841  *    be passed back in the response
 842  *
 843  *  @param ptlv        Pointer to the start of the TLV buffer to parse
 844  *  @param tlvbufsize  size of the TLV buffer
 845  *  @param ptsftlv     Output parameter: Pointer to the TSF TLV if found
 846  *
 847  *  @return            void
 848  */
 849 static
 850 void wlan_ret_802_11_scan_get_tlv_ptrs(struct mrvlietypes_data * ptlv,
 851                                        int tlvbufsize,
 852                                        struct mrvlietypes_tsftimestamp ** ptsftlv)
 853 {
 854         struct mrvlietypes_data *pcurrenttlv;
 855         int tlvbufleft;
 856         u16 tlvtype;
 857         u16 tlvlen;
 858
 859         pcurrenttlv = ptlv;
 860         tlvbufleft = tlvbufsize;
 861         *ptsftlv = NULL;
 862
 863         lbs_deb_scan("SCAN_RESP: tlvbufsize = %d\n", tlvbufsize);
 864         lbs_dbg_hex("SCAN_RESP: TLV Buf", (u8 *) ptlv, tlvbufsize);
 865
 866         while (tlvbufleft >= sizeof(struct mrvlietypesheader)) {
 867                 tlvtype = le16_to_cpu(pcurrenttlv->header.type);
 868                 tlvlen = le16_to_cpu(pcurrenttlv->header.len);
 869
 870                 switch (tlvtype) {
 871                 case TLV_TYPE_TSFTIMESTAMP:
 872                         *ptsftlv = (struct mrvlietypes_tsftimestamp *) pcurrenttlv;
 873                         break;
 874
 875                 default:
 876                         lbs_deb_scan("SCAN_RESP: Unhandled TLV = %d\n",
 877                                tlvtype);
 878                         /* Give up, this seems corrupted */
 879                         return;
 880                 }               /* switch */
 881
 882                 tlvbufleft -= (sizeof(ptlv->header) + tlvlen);
 883                 pcurrenttlv =
 884                     (struct mrvlietypes_data *) (pcurrenttlv->Data + tlvlen);
 885         }                       /* while */
 886 }
 887
 888 /**
 889  *  @brief Interpret a BSS scan response returned from the firmware
 890  *
 891  *  Parse the various fixed fields and IEs passed back for a a BSS probe
 892  *   response or beacon from the scan command.  Record information as needed
 893  *   in the scan table struct bss_descriptor for that entry.
 894  *
 895  *  @param bss  Output parameter: Pointer to the BSS Entry
 896  *
 897  *  @return             0 or -1
 898  */
 899 static int libertas_process_bss(struct bss_descriptor * bss,
 900                                 u8 ** pbeaconinfo, int *bytesleft)
 901 {
 902         enum ieeetypes_elementid elemID;
 903         struct ieeetypes_fhparamset *pFH;
 904         struct ieeetypes_dsparamset *pDS;
 905         struct ieeetypes_cfparamset *pCF;
 906         struct ieeetypes_ibssparamset *pibss;
 907         struct ieeetypes_capinfo *pcap;
 908         struct WLAN_802_11_FIXED_IEs fixedie;
 909         u8 *pcurrentptr;
 910         u8 *pRate;
 911         u8 elemlen;
 912         u8 bytestocopy;
 913         u8 ratesize;
 914         u16 beaconsize;
 915         u8 founddatarateie;
 916         int bytesleftforcurrentbeacon;
 917         int ret;
 918
 919         struct IE_WPA *pIe;
 920         const u8 oui01[4] = { 0x00, 0x50, 0xf2, 0x01 };
 921
 922         struct ieeetypes_countryinfoset *pcountryinfo;
 923
 924         lbs_deb_enter(LBS_DEB_ASSOC);
 925
 926         founddatarateie = 0;
 927         ratesize = 0;
 928         beaconsize = 0;
 929
 930         if (*bytesleft >= sizeof(beaconsize)) {
 931                 /* Extract & convert beacon size from the command buffer */
 932                 beaconsize = le16_to_cpup((void *)*pbeaconinfo);
 933                 *bytesleft -= sizeof(beaconsize);
 934                 *pbeaconinfo += sizeof(beaconsize);
 935         }
 936
 937         if (beaconsize == 0 || beaconsize > *bytesleft) {
 938
 939                 *pbeaconinfo += *bytesleft;
 940                 *bytesleft = 0;
 941
 942                 return -1;
 943         }
 944
 945         /* Initialize the current working beacon pointer for this BSS iteration */
 946         pcurrentptr = *pbeaconinfo;
 947
 948         /* Advance the return beacon pointer past the current beacon */
 949         *pbeaconinfo += beaconsize;
 950         *bytesleft -= beaconsize;
 951
 952         bytesleftforcurrentbeacon = beaconsize;
 953
 954         memcpy(bss->bssid, pcurrentptr, ETH_ALEN);
 955         lbs_deb_scan("process_bss: AP BSSID " MAC_FMT "\n", MAC_ARG(bss->bssid));
 956
 957         pcurrentptr += ETH_ALEN;
 958         bytesleftforcurrentbeacon -= ETH_ALEN;
 959
 960         if (bytesleftforcurrentbeacon < 12) {
 961                 lbs_deb_scan("process_bss: Not enough bytes left\n");
 962                 return -1;
 963         }
 964
 965         /*
 966          * next 4 fields are RSSI, time stamp, beacon interval,
 967          *   and capability information
 968          */
 969
 970         /* RSSI is 1 byte long */
 971         bss->rssi = *pcurrentptr;
 972         lbs_deb_scan("process_bss: RSSI=%02X\n", *pcurrentptr);
 973         pcurrentptr += 1;
 974         bytesleftforcurrentbeacon -= 1;
 975
 976         /* time stamp is 8 bytes long */
 977         fixedie.timestamp = bss->timestamp = le64_to_cpup((void *)pcurrentptr);
 978         pcurrentptr += 8;
 979         bytesleftforcurrentbeacon -= 8;
 980
 981         /* beacon interval is 2 bytes long */
 982         fixedie.beaconinterval = bss->beaconperiod = le16_to_cpup((void *)pcurrentptr);
 983         pcurrentptr += 2;
 984         bytesleftforcurrentbeacon -= 2;
 985
 986         /* capability information is 2 bytes long */
 987         memcpy(&fixedie.capabilities, pcurrentptr, 2);
 988         lbs_deb_scan("process_bss: fixedie.capabilities=0x%X\n",
 989                fixedie.capabilities);
 990         pcap = (struct ieeetypes_capinfo *) & fixedie.capabilities;
 991         memcpy(&bss->cap, pcap, sizeof(struct ieeetypes_capinfo));
 992         pcurrentptr += 2;
 993         bytesleftforcurrentbeacon -= 2;
 994
 995         /* rest of the current buffer are IE's */
 996         lbs_deb_scan("process_bss: IE length for this AP = %d\n",
 997                bytesleftforcurrentbeacon);
 998
 999         lbs_dbg_hex("process_bss: IE info", (u8 *) pcurrentptr,
1000                 bytesleftforcurrentbeacon);
1001
1002         if (pcap->privacy) {
1003                 lbs_deb_scan("process_bss: AP WEP enabled\n");
1004                 bss->privacy = wlan802_11privfilter8021xWEP;
1005         } else {
1006                 bss->privacy = wlan802_11privfilteracceptall;
1007         }
1008
1009         if (pcap->ibss == 1) {
1010                 bss->mode = IW_MODE_ADHOC;
1011         } else {
1012                 bss->mode = IW_MODE_INFRA;
1013         }
1014
1015         /* process variable IE */
1016         while (bytesleftforcurrentbeacon >= 2) {
1017                 elemID = (enum ieeetypes_elementid) (*((u8 *) pcurrentptr));
1018                 elemlen = *((u8 *) pcurrentptr + 1);
1019
1020                 if (bytesleftforcurrentbeacon < elemlen) {
1021                         lbs_deb_scan("process_bss: error in processing IE, "
1022                                "bytes left < IE length\n");
1023                         bytesleftforcurrentbeacon = 0;
1024                         continue;
1025                 }
1026
1027                 switch (elemID) {
1028                 case SSID:
1029                         bss->ssid_len = elemlen;
1030                         memcpy(bss->ssid, (pcurrentptr + 2), elemlen);
1031                         lbs_deb_scan("ssid '%s', ssid length %u\n",
1032                                      escape_essid(bss->ssid, bss->ssid_len),
1033                                      bss->ssid_len);
1034                         break;
1035
1036                 case SUPPORTED_RATES:
1037                         memcpy(bss->datarates, (pcurrentptr + 2), elemlen);
1038                         memmove(bss->libertas_supported_rates, (pcurrentptr + 2),
1039                                 elemlen);
1040                         ratesize = elemlen;
1041                         founddatarateie = 1;
1042                         break;
1043
1044                 case EXTRA_IE:
1045                         lbs_deb_scan("process_bss: EXTRA_IE Found!\n");
1046                         break;
1047
1048                 case FH_PARAM_SET:
1049                         pFH = (struct ieeetypes_fhparamset *) pcurrentptr;
1050                         memmove(&bss->phyparamset.fhparamset, pFH,
1051                                 sizeof(struct ieeetypes_fhparamset));
1052 #if 0 /* I think we can store these LE */
1053                         bss->phyparamset.fhparamset.dwelltime
1054                             = le16_to_cpu(bss->phyparamset.fhparamset.dwelltime);
1055 #endif
1056                         break;
1057
1058                 case DS_PARAM_SET:
1059                         pDS = (struct ieeetypes_dsparamset *) pcurrentptr;
1060                         bss->channel = pDS->currentchan;
1061                         memcpy(&bss->phyparamset.dsparamset, pDS,
1062                                sizeof(struct ieeetypes_dsparamset));
1063                         break;
1064
1065                 case CF_PARAM_SET:
1066                         pCF = (struct ieeetypes_cfparamset *) pcurrentptr;
1067                         memcpy(&bss->ssparamset.cfparamset, pCF,
1068                                sizeof(struct ieeetypes_cfparamset));
1069                         break;
1070
1071                 case IBSS_PARAM_SET:
1072                         pibss = (struct ieeetypes_ibssparamset *) pcurrentptr;
1073                         bss->atimwindow = le32_to_cpu(pibss->atimwindow);
1074                         memmove(&bss->ssparamset.ibssparamset, pibss,
1075                                 sizeof(struct ieeetypes_ibssparamset));
1076 #if 0
1077                         bss->ssparamset.ibssparamset.atimwindow
1078                             = le16_to_cpu(bss->ssparamset.ibssparamset.atimwindow);
1079 #endif
1080                         break;
1081
1082                         /* Handle Country Info IE */
1083                 case COUNTRY_INFO:
1084                         pcountryinfo = (struct ieeetypes_countryinfoset *) pcurrentptr;
1085                         if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
1086                             || pcountryinfo->len > 254) {
1087                                 lbs_deb_scan("process_bss: 11D- Err "
1088                                        "CountryInfo len =%d min=%zd max=254\n",
1089                                        pcountryinfo->len,
1090                                        sizeof(pcountryinfo->countrycode));
1091                                 ret = -1;
1092                                 goto done;
1093                         }
1094
1095                         memcpy(&bss->countryinfo,
1096                                pcountryinfo, pcountryinfo->len + 2);
1097                         lbs_dbg_hex("process_bss: 11D- CountryInfo:",
1098                                 (u8 *) pcountryinfo,
1099                                 (u32) (pcountryinfo->len + 2));
1100                         break;
1101
1102                 case EXTENDED_SUPPORTED_RATES:
1103                         /*
1104                          * only process extended supported rate
1105                          * if data rate is already found.
1106                          * data rate IE should come before
1107                          * extended supported rate IE
1108                          */
1109                         if (founddatarateie) {
1110                                 if ((elemlen + ratesize) > WLAN_SUPPORTED_RATES) {
1111                                         bytestocopy =
1112                                             (WLAN_SUPPORTED_RATES - ratesize);
1113                                 } else {
1114                                         bytestocopy = elemlen;
1115                                 }
1116
1117                                 pRate = (u8 *) bss->datarates;
1118                                 pRate += ratesize;
1119                                 memmove(pRate, (pcurrentptr + 2), bytestocopy);
1120                                 pRate = (u8 *) bss->libertas_supported_rates;
1121                                 pRate += ratesize;
1122                                 memmove(pRate, (pcurrentptr + 2), bytestocopy);
1123                         }
1124                         break;
1125
1126                 case VENDOR_SPECIFIC_221:
1127 #define IE_ID_LEN_FIELDS_BYTES 2
1128                         pIe = (struct IE_WPA *)pcurrentptr;
1129
1130                         if (memcmp(pIe->oui, oui01, sizeof(oui01)))
1131                                 break;
1132
1133                         bss->wpa_ie_len = min(elemlen + IE_ID_LEN_FIELDS_BYTES,
1134                                 MAX_WPA_IE_LEN);
1135                         memcpy(bss->wpa_ie, pcurrentptr, bss->wpa_ie_len);
1136                         lbs_dbg_hex("process_bss: WPA IE", bss->wpa_ie, elemlen);
1137                         break;
1138                 case WPA2_IE:
1139                         pIe = (struct IE_WPA *)pcurrentptr;
1140                         bss->rsn_ie_len = min(elemlen + IE_ID_LEN_FIELDS_BYTES,
1141                                 MAX_WPA_IE_LEN);
1142                         memcpy(bss->rsn_ie, pcurrentptr, bss->rsn_ie_len);
1143                         lbs_dbg_hex("process_bss: RSN_IE", bss->rsn_ie, elemlen);
1144                         break;
1145                 case TIM:
1146                         break;
1147
1148                 case CHALLENGE_TEXT:
1149                         break;
1150                 }
1151
1152                 pcurrentptr += elemlen + 2;
1153
1154                 /* need to account for IE ID and IE len */
1155                 bytesleftforcurrentbeacon -= (elemlen + 2);
1156
1157         }                       /* while (bytesleftforcurrentbeacon > 2) */
1158
1159         /* Timestamp */
1160         bss->last_scanned = jiffies;
1161
1162         ret = 0;
1163
1164 done:
1165         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1166         return ret;
1167 }
1168
1169 /**
1170  *  @brief Compare two SSIDs
1171  *
1172  *  @param ssid1    A pointer to ssid to compare
1173  *  @param ssid2    A pointer to ssid to compare
1174  *
1175  *  @return         0--ssid is same, otherwise is different
1176  */
1177 int libertas_ssid_cmp(u8 *ssid1, u8 ssid1_len, u8 *ssid2, u8 ssid2_len)
1178 {
1179         if (ssid1_len != ssid2_len)
1180                 return -1;
1181
1182         return memcmp(ssid1, ssid2, ssid1_len);
1183 }
1184
1185 /**
1186  *  @brief This function finds a specific compatible BSSID in the scan list
1187  *
1188  *  @param adapter  A pointer to wlan_adapter
1189  *  @param bssid    BSSID to find in the scan list
1190  *  @param mode     Network mode: Infrastructure or IBSS
1191  *
1192  *  @return         index in BSSID list, or error return code (< 0)
1193  */
1194 struct bss_descriptor * libertas_find_bssid_in_list(wlan_adapter * adapter,
1195                 u8 * bssid, u8 mode)
1196 {
1197         struct bss_descriptor * iter_bss;
1198         struct bss_descriptor * found_bss = NULL;
1199
1200         if (!bssid)
1201                 return NULL;
1202
1203         lbs_dbg_hex("libertas_find_BSSID_in_list: looking for ",
1204                 bssid, ETH_ALEN);
1205
1206         /* Look through the scan table for a compatible match.  The loop will
1207          *   continue past a matched bssid that is not compatible in case there
1208          *   is an AP with multiple SSIDs assigned to the same BSSID
1209          */
1210         mutex_lock(&adapter->lock);
1211         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1212                 if (compare_ether_addr(iter_bss->bssid, bssid))
1213                         continue; /* bssid doesn't match */
1214                 switch (mode) {
1215                 case IW_MODE_INFRA:
1216                 case IW_MODE_ADHOC:
1217                         if (!is_network_compatible(adapter, iter_bss, mode))
1218                                 break;
1219                         found_bss = iter_bss;
1220                         break;
1221                 default:
1222                         found_bss = iter_bss;
1223                         break;
1224                 }
1225         }
1226         mutex_unlock(&adapter->lock);
1227
1228         return found_bss;
1229 }
1230
1231 /**
1232  *  @brief This function finds ssid in ssid list.
1233  *
1234  *  @param adapter  A pointer to wlan_adapter
1235  *  @param ssid     SSID to find in the list
1236  *  @param bssid    BSSID to qualify the SSID selection (if provided)
1237  *  @param mode     Network mode: Infrastructure or IBSS
1238  *
1239  *  @return         index in BSSID list
1240  */
1241 struct bss_descriptor * libertas_find_ssid_in_list(wlan_adapter * adapter,
1242                    u8 *ssid, u8 ssid_len, u8 * bssid, u8 mode,
1243                    int channel)
1244 {
1245         u8 bestrssi = 0;
1246         struct bss_descriptor * iter_bss = NULL;
1247         struct bss_descriptor * found_bss = NULL;
1248         struct bss_descriptor * tmp_oldest = NULL;
1249
1250         mutex_lock(&adapter->lock);
1251
1252         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1253                 if (   !tmp_oldest
1254                     || (iter_bss->last_scanned < tmp_oldest->last_scanned))
1255                         tmp_oldest = iter_bss;
1256
1257                 if (libertas_ssid_cmp(iter_bss->ssid, iter_bss->ssid_len,
1258                                       ssid, ssid_len) != 0)
1259                         continue; /* ssid doesn't match */
1260                 if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
1261                         continue; /* bssid doesn't match */
1262                 if ((channel > 0) && (iter_bss->channel != channel))
1263                         continue; /* channel doesn't match */
1264
1265                 switch (mode) {
1266                 case IW_MODE_INFRA:
1267                 case IW_MODE_ADHOC:
1268                         if (!is_network_compatible(adapter, iter_bss, mode))
1269                                 break;
1270
1271                         if (bssid) {
1272                                 /* Found requested BSSID */
1273                                 found_bss = iter_bss;
1274                                 goto out;
1275                         }
1276
1277                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1278                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1279                                 found_bss = iter_bss;
1280                         }
1281                         break;
1282                 case IW_MODE_AUTO:
1283                 default:
1284                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1285                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1286                                 found_bss = iter_bss;
1287                         }
1288                         break;
1289                 }
1290         }
1291
1292 out:
1293         mutex_unlock(&adapter->lock);
1294         return found_bss;
1295 }
1296
1297 /**
1298  *  @brief This function finds the best SSID in the Scan List
1299  *
1300  *  Search the scan table for the best SSID that also matches the current
1301  *   adapter network preference (infrastructure or adhoc)
1302  *
1303  *  @param adapter  A pointer to wlan_adapter
1304  *
1305  *  @return         index in BSSID list
1306  */
1307 struct bss_descriptor * libertas_find_best_ssid_in_list(wlan_adapter * adapter,
1308                 u8 mode)
1309 {
1310         u8 bestrssi = 0;
1311         struct bss_descriptor * iter_bss;
1312         struct bss_descriptor * best_bss = NULL;
1313
1314         mutex_lock(&adapter->lock);
1315
1316         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1317                 switch (mode) {
1318                 case IW_MODE_INFRA:
1319                 case IW_MODE_ADHOC:
1320                         if (!is_network_compatible(adapter, iter_bss, mode))
1321                                 break;
1322                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1323                                 break;
1324                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1325                         best_bss = iter_bss;
1326                         break;
1327                 case IW_MODE_AUTO:
1328                 default:
1329                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1330                                 break;
1331                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1332                         best_bss = iter_bss;
1333                         break;
1334                 }
1335         }
1336
1337         mutex_unlock(&adapter->lock);
1338         return best_bss;
1339 }
1340
1341 /**
1342  *  @brief Find the AP with specific ssid in the scan list
1343  *
1344  *  @param priv         A pointer to wlan_private structure
1345  *  @param pSSID        A pointer to AP's ssid
1346  *
1347  *  @return             0--success, otherwise--fail
1348  */
1349 int libertas_find_best_network_ssid(wlan_private * priv,
1350                 u8 *out_ssid, u8 *out_ssid_len, u8 preferred_mode, u8 *out_mode)
1351 {
1352         wlan_adapter *adapter = priv->adapter;
1353         int ret = -1;
1354         struct bss_descriptor * found;
1355
1356         lbs_deb_enter(LBS_DEB_ASSOC);
1357
1358         wlan_scan_networks(priv, NULL, 1);
1359         if (adapter->surpriseremoved)
1360                 return -1;
1361
1362         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1363
1364         found = libertas_find_best_ssid_in_list(adapter, preferred_mode);
1365         if (found && (found->ssid_len > 0)) {
1366                 memcpy(out_ssid, &found->ssid, IW_ESSID_MAX_SIZE);
1367                 *out_ssid_len = found->ssid_len;
1368                 *out_mode = found->mode;
1369                 ret = 0;
1370         }
1371
1372         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1373         return ret;
1374 }
1375
1376 /**
1377  *  @brief Scan Network
1378  *
1379  *  @param dev          A pointer to net_device structure
1380  *  @param info         A pointer to iw_request_info structure
1381  *  @param vwrq         A pointer to iw_param structure
1382  *  @param extra        A pointer to extra data buf
1383  *
1384  *  @return             0 --success, otherwise fail
1385  */
1386 int libertas_set_scan(struct net_device *dev, struct iw_request_info *info,
1387                   struct iw_param *vwrq, char *extra)
1388 {
1389         wlan_private *priv = dev->priv;
1390         wlan_adapter *adapter = priv->adapter;
1391
1392         lbs_deb_enter(LBS_DEB_SCAN);
1393
1394         wlan_scan_networks(priv, NULL, 0);
1395
1396         if (adapter->surpriseremoved)
1397                 return -1;
1398
1399         lbs_deb_leave(LBS_DEB_SCAN);
1400         return 0;
1401 }
1402
1403 /**
1404  *  @brief Send a scan command for all available channels filtered on a spec
1405  *
1406  *  @param priv             A pointer to wlan_private structure
1407  *  @param prequestedssid   A pointer to AP's ssid
1408  *  @param keeppreviousscan Flag used to save/clear scan table before scan
1409  *
1410  *  @return                0-success, otherwise fail
1411  */
1412 int libertas_send_specific_ssid_scan(wlan_private * priv,
1413                         u8 *ssid, u8 ssid_len, u8 clear_ssid)
1414 {
1415         wlan_adapter *adapter = priv->adapter;
1416         struct wlan_ioctl_user_scan_cfg scancfg;
1417         int ret = 0;
1418
1419         lbs_deb_enter(LBS_DEB_ASSOC);
1420
1421         if (!ssid_len)
1422                 goto out;
1423
1424         memset(&scancfg, 0x00, sizeof(scancfg));
1425         memcpy(scancfg.ssid, ssid, ssid_len);
1426         scancfg.ssid_len = ssid_len;
1427         scancfg.clear_ssid = clear_ssid;
1428
1429         wlan_scan_networks(priv, &scancfg, 1);
1430         if (adapter->surpriseremoved)
1431                 return -1;
1432         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1433
1434 out:
1435         lbs_deb_leave(LBS_DEB_ASSOC);
1436         return ret;
1437 }
1438
1439 /**
1440  *  @brief scan an AP with specific BSSID
1441  *
1442  *  @param priv             A pointer to wlan_private structure
1443  *  @param bssid            A pointer to AP's bssid
1444  *  @param keeppreviousscan Flag used to save/clear scan table before scan
1445  *
1446  *  @return          0-success, otherwise fail
1447  */
1448 int libertas_send_specific_bssid_scan(wlan_private * priv, u8 * bssid, u8 clear_bssid)
1449 {
1450         struct wlan_ioctl_user_scan_cfg scancfg;
1451
1452         lbs_deb_enter(LBS_DEB_ASSOC);
1453
1454         if (bssid == NULL)
1455                 goto out;
1456
1457         memset(&scancfg, 0x00, sizeof(scancfg));
1458         memcpy(scancfg.bssid, bssid, ETH_ALEN);
1459         scancfg.clear_bssid = clear_bssid;
1460
1461         wlan_scan_networks(priv, &scancfg, 1);
1462         if (priv->adapter->surpriseremoved)
1463                 return -1;
1464         wait_event_interruptible(priv->adapter->cmd_pending,
1465                 !priv->adapter->nr_cmd_pending);
1466
1467 out:
1468         lbs_deb_leave(LBS_DEB_ASSOC);
1469         return 0;
1470 }
1471
1472 static inline char *libertas_translate_scan(wlan_private *priv,
1473                                         char *start, char *stop,
1474                                         struct bss_descriptor *bss)
1475 {
1476         wlan_adapter *adapter = priv->adapter;
1477         struct chan_freq_power *cfp;
1478         char *current_val;      /* For rates */
1479         struct iw_event iwe;    /* Temporary buffer */
1480         int j;
1481 #define PERFECT_RSSI ((u8)50)
1482 #define WORST_RSSI   ((u8)0)
1483 #define RSSI_DIFF    ((u8)(PERFECT_RSSI - WORST_RSSI))
1484         u8 rssi;
1485
1486         cfp = libertas_find_cfp_by_band_and_channel(adapter, 0, bss->channel);
1487         if (!cfp) {
1488                 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1489                 return NULL;
1490         }
1491
1492         /* First entry *MUST* be the AP BSSID */
1493         iwe.cmd = SIOCGIWAP;
1494         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1495         memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1496         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1497
1498         /* SSID */
1499         iwe.cmd = SIOCGIWESSID;
1500         iwe.u.data.flags = 1;
1501         iwe.u.data.length = min((u32) bss->ssid_len, (u32) IW_ESSID_MAX_SIZE);
1502         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1503
1504         /* Mode */
1505         iwe.cmd = SIOCGIWMODE;
1506         iwe.u.mode = bss->mode;
1507         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1508
1509         /* Frequency */
1510         iwe.cmd = SIOCGIWFREQ;
1511         iwe.u.freq.m = (long)cfp->freq * 100000;
1512         iwe.u.freq.e = 1;
1513         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1514
1515         /* Add quality statistics */
1516         iwe.cmd = IWEVQUAL;
1517         iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1518         iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1519
1520         rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1521         iwe.u.qual.qual =
1522             (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1523              (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1524             (RSSI_DIFF * RSSI_DIFF);
1525         if (iwe.u.qual.qual > 100)
1526                 iwe.u.qual.qual = 100;
1527
1528         if (adapter->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1529                 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1530         } else {
1531                 iwe.u.qual.noise =
1532                     CAL_NF(adapter->NF[TYPE_BEACON][TYPE_NOAVG]);
1533         }
1534
1535         /* Locally created ad-hoc BSSs won't have beacons if this is the
1536          * only station in the adhoc network; so get signal strength
1537          * from receive statistics.
1538          */
1539         if ((adapter->mode == IW_MODE_ADHOC)
1540             && adapter->adhoccreate
1541             && !libertas_ssid_cmp(adapter->curbssparams.ssid,
1542                                   adapter->curbssparams.ssid_len,
1543                                   bss->ssid, bss->ssid_len)) {
1544                 int snr, nf;
1545                 snr = adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1546                 nf = adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1547                 iwe.u.qual.level = CAL_RSSI(snr, nf);
1548         }
1549         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
1550
1551         /* Add encryption capability */
1552         iwe.cmd = SIOCGIWENCODE;
1553         if (bss->privacy) {
1554                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1555         } else {
1556                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1557         }
1558         iwe.u.data.length = 0;
1559         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1560
1561         current_val = start + IW_EV_LCP_LEN;
1562
1563         iwe.cmd = SIOCGIWRATE;
1564         iwe.u.bitrate.fixed = 0;
1565         iwe.u.bitrate.disabled = 0;
1566         iwe.u.bitrate.value = 0;
1567
1568         for (j = 0; j < sizeof(bss->libertas_supported_rates); j++) {
1569                 u8 rate = bss->libertas_supported_rates[j];
1570                 if (rate == 0)
1571                         break; /* no more rates */
1572                 /* Bit rate given in 500 kb/s units (+ 0x80) */
1573                 iwe.u.bitrate.value = (rate & 0x7f) * 500000;
1574                 current_val = iwe_stream_add_value(start, current_val,
1575                                          stop, &iwe, IW_EV_PARAM_LEN);
1576         }
1577         if ((bss->mode == IW_MODE_ADHOC)
1578             && !libertas_ssid_cmp(adapter->curbssparams.ssid,
1579                                   adapter->curbssparams.ssid_len,
1580                                   bss->ssid, bss->ssid_len)
1581             && adapter->adhoccreate) {
1582                 iwe.u.bitrate.value = 22 * 500000;
1583                 current_val = iwe_stream_add_value(start, current_val,
1584                                          stop, &iwe, IW_EV_PARAM_LEN);
1585         }
1586         /* Check if we added any event */
1587         if((current_val - start) > IW_EV_LCP_LEN)
1588                 start = current_val;
1589
1590         memset(&iwe, 0, sizeof(iwe));
1591         if (bss->wpa_ie_len) {
1592                 char buf[MAX_WPA_IE_LEN];
1593                 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1594                 iwe.cmd = IWEVGENIE;
1595                 iwe.u.data.length = bss->wpa_ie_len;
1596                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1597         }
1598
1599         memset(&iwe, 0, sizeof(iwe));
1600         if (bss->rsn_ie_len) {
1601                 char buf[MAX_WPA_IE_LEN];
1602                 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1603                 iwe.cmd = IWEVGENIE;
1604                 iwe.u.data.length = bss->rsn_ie_len;
1605                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1606         }
1607
1608         return start;
1609 }
1610
1611 /**
1612  *  @brief  Retrieve the scan table entries via wireless tools IOCTL call
1613  *
1614  *  @param dev          A pointer to net_device structure
1615  *  @param info         A pointer to iw_request_info structure
1616  *  @param dwrq         A pointer to iw_point structure
1617  *  @param extra        A pointer to extra data buf
1618  *
1619  *  @return             0 --success, otherwise fail
1620  */
1621 int libertas_get_scan(struct net_device *dev, struct iw_request_info *info,
1622                   struct iw_point *dwrq, char *extra)
1623 {
1624 #define SCAN_ITEM_SIZE 128
1625         wlan_private *priv = dev->priv;
1626         wlan_adapter *adapter = priv->adapter;
1627         int err = 0;
1628         char *ev = extra;
1629         char *stop = ev + dwrq->length;
1630         struct bss_descriptor * iter_bss;
1631         struct bss_descriptor * safe;
1632
1633         lbs_deb_enter(LBS_DEB_ASSOC);
1634
1635         /* If we've got an uncompleted scan, schedule the next part */
1636         if (!adapter->nr_cmd_pending && adapter->last_scanned_channel)
1637                 wlan_scan_networks(priv, NULL, 0);
1638
1639         /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1640         if ((adapter->mode == IW_MODE_ADHOC) && adapter->adhoccreate) {
1641                 libertas_prepare_and_send_command(priv, cmd_802_11_rssi, 0,
1642                                         cmd_option_waitforrsp, 0, NULL);
1643         }
1644
1645         mutex_lock(&adapter->lock);
1646         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1647                 char * next_ev;
1648                 unsigned long stale_time;
1649
1650                 if (stop - ev < SCAN_ITEM_SIZE) {
1651                         err = -E2BIG;
1652                         break;
1653                 }
1654
1655                 /* Prune old an old scan result */
1656                 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1657                 if (time_after(jiffies, stale_time)) {
1658                         list_move_tail (&iter_bss->list,
1659                                         &adapter->network_free_list);
1660                         clear_bss_descriptor(iter_bss);
1661                         continue;
1662                 }
1663
1664                 /* Translate to WE format this entry */
1665                 next_ev = libertas_translate_scan(priv, ev, stop, iter_bss);
1666                 if (next_ev == NULL)
1667                         continue;
1668                 ev = next_ev;
1669         }
1670         mutex_unlock(&adapter->lock);
1671
1672         dwrq->length = (ev - extra);
1673         dwrq->flags = 0;
1674
1675         lbs_deb_leave(LBS_DEB_ASSOC);
1676         return err;
1677 }
1678
1679 /**
1680  *  @brief Prepare a scan command to be sent to the firmware
1681  *
1682  *  Use the wlan_scan_cmd_config sent to the command processing module in
1683  *   the libertas_prepare_and_send_command to configure a cmd_ds_802_11_scan command
1684  *   struct to send to firmware.
1685  *
1686  *  The fixed fields specifying the BSS type and BSSID filters as well as a
1687  *   variable number/length of TLVs are sent in the command to firmware.
1688  *
1689  *  @param priv       A pointer to wlan_private structure
1690  *  @param cmd        A pointer to cmd_ds_command structure to be sent to
1691  *                    firmware with the cmd_DS_801_11_SCAN structure
1692  *  @param pdata_buf  Void pointer cast of a wlan_scan_cmd_config struct used
1693  *                    to set the fields/TLVs for the command sent to firmware
1694  *
1695  *  @return           0 or -1
1696  *
1697  *  @sa wlan_scan_create_channel_list
1698  */
1699 int libertas_cmd_80211_scan(wlan_private * priv,
1700                          struct cmd_ds_command *cmd, void *pdata_buf)
1701 {
1702         struct cmd_ds_802_11_scan *pscan = &cmd->params.scan;
1703         struct wlan_scan_cmd_config *pscancfg;
1704
1705         lbs_deb_enter(LBS_DEB_ASSOC);
1706
1707         pscancfg = pdata_buf;
1708
1709         /* Set fixed field variables in scan command */
1710         pscan->bsstype = pscancfg->bsstype;
1711         memcpy(pscan->BSSID, pscancfg->bssid, sizeof(pscan->BSSID));
1712         memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen);
1713
1714         cmd->command = cpu_to_le16(cmd_802_11_scan);
1715
1716         /* size is equal to the sizeof(fixed portions) + the TLV len + header */
1717         cmd->size = cpu_to_le16(sizeof(pscan->bsstype)
1718                                      + sizeof(pscan->BSSID)
1719                                      + pscancfg->tlvbufferlen + S_DS_GEN);
1720
1721         lbs_deb_scan("SCAN_CMD: command=%x, size=%x, seqnum=%x\n",
1722                      le16_to_cpu(cmd->command), le16_to_cpu(cmd->size),
1723                      le16_to_cpu(cmd->seqnum));
1724
1725         lbs_deb_leave(LBS_DEB_ASSOC);
1726         return 0;
1727 }
1728
1729 static inline int is_same_network(struct bss_descriptor *src,
1730                                   struct bss_descriptor *dst)
1731 {
1732         /* A network is only a duplicate if the channel, BSSID, and ESSID
1733          * all match.  We treat all <hidden> with the same BSSID and channel
1734          * as one network */
1735         return ((src->ssid_len == dst->ssid_len) &&
1736                 (src->channel == dst->channel) &&
1737                 !compare_ether_addr(src->bssid, dst->bssid) &&
1738                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1739 }
1740
1741 /**
1742  *  @brief This function handles the command response of scan
1743  *
1744  *   The response buffer for the scan command has the following
1745  *      memory layout:
1746  *
1747  *     .-----------------------------------------------------------.
1748  *     |  header (4 * sizeof(u16)):  Standard command response hdr |
1749  *     .-----------------------------------------------------------.
1750  *     |  bufsize (u16) : sizeof the BSS Description data          |
1751  *     .-----------------------------------------------------------.
1752  *     |  NumOfSet (u8) : Number of BSS Descs returned             |
1753  *     .-----------------------------------------------------------.
1754  *     |  BSSDescription data (variable, size given in bufsize)    |
1755  *     .-----------------------------------------------------------.
1756  *     |  TLV data (variable, size calculated using header->size,  |
1757  *     |            bufsize and sizeof the fixed fields above)     |
1758  *     .-----------------------------------------------------------.
1759  *
1760  *  @param priv    A pointer to wlan_private structure
1761  *  @param resp    A pointer to cmd_ds_command
1762  *
1763  *  @return        0 or -1
1764  */
1765 int libertas_ret_80211_scan(wlan_private * priv, struct cmd_ds_command *resp)
1766 {
1767         wlan_adapter *adapter = priv->adapter;
1768         struct cmd_ds_802_11_scan_rsp *pscan;
1769         struct mrvlietypes_data *ptlv;
1770         struct mrvlietypes_tsftimestamp *ptsftlv;
1771         struct bss_descriptor * iter_bss;
1772         struct bss_descriptor * safe;
1773         u8 *pbssinfo;
1774         u16 scanrespsize;
1775         int bytesleft;
1776         int idx;
1777         int tlvbufsize;
1778         int ret;
1779
1780         lbs_deb_enter(LBS_DEB_ASSOC);
1781
1782         /* Prune old entries from scan table */
1783         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1784                 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1785                 if (time_before(jiffies, stale_time))
1786                         continue;
1787                 list_move_tail (&iter_bss->list, &adapter->network_free_list);
1788                 clear_bss_descriptor(iter_bss);
1789         }
1790
1791         pscan = &resp->params.scanresp;
1792
1793         if (pscan->nr_sets > MAX_NETWORK_COUNT) {
1794                 lbs_deb_scan(
1795                        "SCAN_RESP: too many scan results (%d, max %d)!!\n",
1796                        pscan->nr_sets, MAX_NETWORK_COUNT);
1797                 ret = -1;
1798                 goto done;
1799         }
1800
1801         bytesleft = le16_to_cpu(pscan->bssdescriptsize);
1802         lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1803
1804         scanrespsize = le16_to_cpu(resp->size);
1805         lbs_deb_scan("SCAN_RESP: returned %d AP before parsing\n",
1806                pscan->nr_sets);
1807
1808         pbssinfo = pscan->bssdesc_and_tlvbuffer;
1809
1810         /* The size of the TLV buffer is equal to the entire command response
1811          *   size (scanrespsize) minus the fixed fields (sizeof()'s), the
1812          *   BSS Descriptions (bssdescriptsize as bytesLef) and the command
1813          *   response header (S_DS_GEN)
1814          */
1815         tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize)
1816                                      + sizeof(pscan->nr_sets)
1817                                      + S_DS_GEN);
1818
1819         ptlv = (struct mrvlietypes_data *) (pscan->bssdesc_and_tlvbuffer + bytesleft);
1820
1821         /* Search the TLV buffer space in the scan response for any valid TLVs */
1822         wlan_ret_802_11_scan_get_tlv_ptrs(ptlv, tlvbufsize, &ptsftlv);
1823
1824         /*
1825          *  Process each scan response returned (pscan->nr_sets).  Save
1826          *    the information in the newbssentry and then insert into the
1827          *    driver scan table either as an update to an existing entry
1828          *    or as an addition at the end of the table
1829          */
1830         for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) {
1831                 struct bss_descriptor new;
1832                 struct bss_descriptor * found = NULL;
1833                 struct bss_descriptor * oldest = NULL;
1834
1835                 /* Process the data fields and IEs returned for this BSS */
1836                 memset(&new, 0, sizeof (struct bss_descriptor));
1837                 if (libertas_process_bss(&new, &pbssinfo, &bytesleft) != 0) {
1838                         /* error parsing the scan response, skipped */
1839                         lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1840                         continue;
1841                 }
1842
1843                 /* Try to find this bss in the scan table */
1844                 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1845                         if (is_same_network(iter_bss, &new)) {
1846                                 found = iter_bss;
1847                                 break;
1848                         }
1849
1850                         if ((oldest == NULL) ||
1851                             (iter_bss->last_scanned < oldest->last_scanned))
1852                                 oldest = iter_bss;
1853                 }
1854
1855                 if (found) {
1856                         /* found, clear it */
1857                         clear_bss_descriptor(found);
1858                 } else if (!list_empty(&adapter->network_free_list)) {
1859                         /* Pull one from the free list */
1860                         found = list_entry(adapter->network_free_list.next,
1861                                            struct bss_descriptor, list);
1862                         list_move_tail(&found->list, &adapter->network_list);
1863                 } else if (oldest) {
1864                         /* If there are no more slots, expire the oldest */
1865                         found = oldest;
1866                         clear_bss_descriptor(found);
1867                         list_move_tail(&found->list, &adapter->network_list);
1868                 } else {
1869                         continue;
1870                 }
1871
1872                 lbs_deb_scan("SCAN_RESP: BSSID = " MAC_FMT "\n",
1873                        new.bssid[0], new.bssid[1], new.bssid[2],
1874                        new.bssid[3], new.bssid[4], new.bssid[5]);
1875
1876                 /*
1877                  * If the TSF TLV was appended to the scan results, save the
1878                  *   this entries TSF value in the networktsf field.  The
1879                  *   networktsf is the firmware's TSF value at the time the
1880                  *   beacon or probe response was received.
1881                  */
1882                 if (ptsftlv) {
1883                         new.networktsf = le64_to_cpup(&ptsftlv->tsftable[idx]);
1884                 }
1885
1886                 /* Copy the locally created newbssentry to the scan table */
1887                 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1888         }
1889
1890         ret = 0;
1891
1892 done:
1893         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1894         return ret;
1895 }