SAFE public projects git trees. - safe/jmp/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 Post process the scan table after a new scan command has completed
 219  *
 220  *  Inspect each entry of the scan table and try to find an entry that
 221  *    matches our current associated/joined network from the scan.  If
 222  *    one is found, update the stored copy of the bssdescriptor for our
 223  *    current network.
 224  *
 225  *  Debug dump the current scan table contents if compiled accordingly.
 226  *
 227  *  @param priv   A pointer to wlan_private structure
 228  *
 229  *  @return       void
 230  */
 231 static void wlan_scan_process_results(wlan_private * priv)
 232 {
 233         wlan_adapter *adapter = priv->adapter;
 234         struct bss_descriptor * iter_bss;
 235
 236         if (adapter->connect_status == libertas_connected)
 237                 return;
 238
 239         mutex_lock(&adapter->lock);
 240         list_for_each_entry (iter_bss, &adapter->network_list, list) {
 241                 lbs_deb_scan("Scan:(%02d) " MAC_FMT ", RSSI[%03d], SSID[%s]\n",
 242                        i++, MAC_ARG(iter_bss->bssid), (s32) iter_bss->rssi,
 243                        iter_bss->ssid.ssid);
 244         }
 245         mutex_unlock(&adapter->lock);
 246 }
 247
 248 /**
 249  *  @brief Create a channel list for the driver to scan based on region info
 250  *
 251  *  Use the driver region/band information to construct a comprehensive list
 252  *    of channels to scan.  This routine is used for any scan that is not
 253  *    provided a specific channel list to scan.
 254  *
 255  *  @param priv          A pointer to wlan_private structure
 256  *  @param scanchanlist  Output parameter: resulting channel list to scan
 257  *  @param filteredscan  Flag indicating whether or not a BSSID or SSID filter
 258  *                       is being sent in the command to firmware.  Used to
 259  *                       increase the number of channels sent in a scan
 260  *                       command and to disable the firmware channel scan
 261  *                       filter.
 262  *
 263  *  @return              void
 264  */
 265 static void wlan_scan_create_channel_list(wlan_private * priv,
 266                                           struct chanscanparamset * scanchanlist,
 267                                           u8 filteredscan)
 268 {
 269
 270         wlan_adapter *adapter = priv->adapter;
 271         struct region_channel *scanregion;
 272         struct chan_freq_power *cfp;
 273         int rgnidx;
 274         int chanidx;
 275         int nextchan;
 276         u8 scantype;
 277
 278         chanidx = 0;
 279
 280         /* Set the default scan type to the user specified type, will later
 281          *   be changed to passive on a per channel basis if restricted by
 282          *   regulatory requirements (11d or 11h)
 283          */
 284         scantype = adapter->scantype;
 285
 286         for (rgnidx = 0; rgnidx < ARRAY_SIZE(adapter->region_channel); rgnidx++) {
 287                 if (priv->adapter->enable11d &&
 288                     adapter->connect_status != libertas_connected) {
 289                         /* Scan all the supported chan for the first scan */
 290                         if (!adapter->universal_channel[rgnidx].valid)
 291                                 continue;
 292                         scanregion = &adapter->universal_channel[rgnidx];
 293
 294                         /* clear the parsed_region_chan for the first scan */
 295                         memset(&adapter->parsed_region_chan, 0x00,
 296                                sizeof(adapter->parsed_region_chan));
 297                 } else {
 298                         if (!adapter->region_channel[rgnidx].valid)
 299                                 continue;
 300                         scanregion = &adapter->region_channel[rgnidx];
 301                 }
 302
 303                 for (nextchan = 0;
 304                      nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
 305
 306                         cfp = scanregion->CFP + nextchan;
 307
 308                         if (priv->adapter->enable11d) {
 309                                 scantype =
 310                                     libertas_get_scan_type_11d(cfp->channel,
 311                                                            &adapter->
 312                                                            parsed_region_chan);
 313                         }
 314
 315                         switch (scanregion->band) {
 316                         case BAND_B:
 317                         case BAND_G:
 318                         default:
 319                                 scanchanlist[chanidx].radiotype =
 320                                     cmd_scan_radio_type_bg;
 321                                 break;
 322                         }
 323
 324                         if (scantype == cmd_scan_type_passive) {
 325                                 scanchanlist[chanidx].maxscantime =
 326                                     cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
 327                                 scanchanlist[chanidx].chanscanmode.passivescan =
 328                                     1;
 329                         } else {
 330                                 scanchanlist[chanidx].maxscantime =
 331                                     cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
 332                                 scanchanlist[chanidx].chanscanmode.passivescan =
 333                                     0;
 334                         }
 335
 336                         scanchanlist[chanidx].channumber = cfp->channel;
 337
 338                         if (filteredscan) {
 339                                 scanchanlist[chanidx].chanscanmode.
 340                                     disablechanfilt = 1;
 341                         }
 342                 }
 343         }
 344 }
 345
 346 /**
 347  *  @brief Construct a wlan_scan_cmd_config structure to use in issue scan cmds
 348  *
 349  *  Application layer or other functions can invoke wlan_scan_networks
 350  *    with a scan configuration supplied in a wlan_ioctl_user_scan_cfg struct.
 351  *    This structure is used as the basis of one or many wlan_scan_cmd_config
 352  *    commands that are sent to the command processing module and sent to
 353  *    firmware.
 354  *
 355  *  Create a wlan_scan_cmd_config based on the following user supplied
 356  *    parameters (if present):
 357  *             - SSID filter
 358  *             - BSSID filter
 359  *             - Number of Probes to be sent
 360  *             - channel list
 361  *
 362  *  If the SSID or BSSID filter is not present, disable/clear the filter.
 363  *  If the number of probes is not set, use the adapter default setting
 364  *  Qualify the channel
 365  *
 366  *  @param priv             A pointer to wlan_private structure
 367  *  @param puserscanin      NULL or pointer to scan configuration parameters
 368  *  @param ppchantlvout     Output parameter: Pointer to the start of the
 369  *                          channel TLV portion of the output scan config
 370  *  @param pscanchanlist    Output parameter: Pointer to the resulting channel
 371  *                          list to scan
 372  *  @param pmaxchanperscan  Output parameter: Number of channels to scan for
 373  *                          each issuance of the firmware scan command
 374  *  @param pfilteredscan    Output parameter: Flag indicating whether or not
 375  *                          a BSSID or SSID filter is being sent in the
 376  *                          command to firmware.  Used to increase the number
 377  *                          of channels sent in a scan command and to
 378  *                          disable the firmware channel scan filter.
 379  *  @param pscancurrentonly Output parameter: Flag indicating whether or not
 380  *                          we are only scanning our current active channel
 381  *
 382  *  @return                 resulting scan configuration
 383  */
 384 static struct wlan_scan_cmd_config *
 385 wlan_scan_setup_scan_config(wlan_private * priv,
 386                             const struct wlan_ioctl_user_scan_cfg * puserscanin,
 387                             struct mrvlietypes_chanlistparamset ** ppchantlvout,
 388                             struct chanscanparamset * pscanchanlist,
 389                             int *pmaxchanperscan,
 390                             u8 * pfilteredscan,
 391                             u8 * pscancurrentonly)
 392 {
 393         wlan_adapter *adapter = priv->adapter;
 394         struct mrvlietypes_numprobes *pnumprobestlv;
 395         struct mrvlietypes_ssidparamset *pssidtlv;
 396         struct wlan_scan_cmd_config * pscancfgout = NULL;
 397         u8 *ptlvpos;
 398         u16 numprobes;
 399         int chanidx;
 400         int scantype;
 401         int scandur;
 402         int channel;
 403         int radiotype;
 404
 405         pscancfgout = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
 406         if (pscancfgout == NULL)
 407                 goto out;
 408
 409         /* The tlvbufferlen is calculated for each scan command.  The TLVs added
 410          *   in this routine will be preserved since the routine that sends
 411          *   the command will append channelTLVs at *ppchantlvout.  The difference
 412          *   between the *ppchantlvout and the tlvbuffer start will be used
 413          *   to calculate the size of anything we add in this routine.
 414          */
 415         pscancfgout->tlvbufferlen = 0;
 416
 417         /* Running tlv pointer.  Assigned to ppchantlvout at end of function
 418          *  so later routines know where channels can be added to the command buf
 419          */
 420         ptlvpos = pscancfgout->tlvbuffer;
 421
 422         /*
 423          * Set the initial scan paramters for progressive scanning.  If a specific
 424          *   BSSID or SSID is used, the number of channels in the scan command
 425          *   will be increased to the absolute maximum
 426          */
 427         *pmaxchanperscan = MRVDRV_CHANNELS_PER_SCAN_CMD;
 428
 429         /* Initialize the scan as un-filtered by firmware, set to TRUE below if
 430          *   a SSID or BSSID filter is sent in the command
 431          */
 432         *pfilteredscan = 0;
 433
 434         /* Initialize the scan as not being only on the current channel.  If
 435          *   the channel list is customized, only contains one channel, and
 436          *   is the active channel, this is set true and data flow is not halted.
 437          */
 438         *pscancurrentonly = 0;
 439
 440         if (puserscanin) {
 441
 442                 /* Set the bss type scan filter, use adapter setting if unset */
 443                 pscancfgout->bsstype =
 444                     (puserscanin->bsstype ? puserscanin->bsstype : adapter->
 445                      scanmode);
 446
 447                 /* Set the number of probes to send, use adapter setting if unset */
 448                 numprobes = (puserscanin->numprobes ? puserscanin->numprobes :
 449                              adapter->scanprobes);
 450
 451                 /*
 452                  * Set the BSSID filter to the incoming configuration,
 453                  *   if non-zero.  If not set, it will remain disabled (all zeros).
 454                  */
 455                 memcpy(pscancfgout->bssid, puserscanin->bssid,
 456                        sizeof(pscancfgout->bssid));
 457
 458                 if (puserscanin->ssid_len) {
 459                         pssidtlv =
 460                             (struct mrvlietypes_ssidparamset *) pscancfgout->
 461                             tlvbuffer;
 462                         pssidtlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
 463                         pssidtlv->header.len = cpu_to_le16(puserscanin->ssid_len);
 464                         memcpy(pssidtlv->ssid, puserscanin->ssid,
 465                                puserscanin->ssid_len);
 466                         ptlvpos += sizeof(pssidtlv->header) + puserscanin->ssid_len;
 467                 }
 468
 469                 /*
 470                  *  The default number of channels sent in the command is low to
 471                  *    ensure the response buffer from the firmware does not truncate
 472                  *    scan results.  That is not an issue with an SSID or BSSID
 473                  *    filter applied to the scan results in the firmware.
 474                  */
 475                 if (   puserscanin->ssid_len
 476                     || (compare_ether_addr(pscancfgout->bssid, &zeromac[0]) != 0)) {
 477                         *pmaxchanperscan = MRVDRV_MAX_CHANNELS_PER_SCAN;
 478                         *pfilteredscan = 1;
 479                 }
 480         } else {
 481                 pscancfgout->bsstype = adapter->scanmode;
 482                 numprobes = adapter->scanprobes;
 483         }
 484
 485         /* If the input config or adapter has the number of Probes set, add tlv */
 486         if (numprobes) {
 487                 pnumprobestlv = (struct mrvlietypes_numprobes *) ptlvpos;
 488                 pnumprobestlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 489                 pnumprobestlv->header.len = cpu_to_le16(2);
 490                 pnumprobestlv->numprobes = cpu_to_le16(numprobes);
 491
 492                 ptlvpos += sizeof(*pnumprobestlv);
 493         }
 494
 495         /*
 496          * Set the output for the channel TLV to the address in the tlv buffer
 497          *   past any TLVs that were added in this fuction (SSID, numprobes).
 498          *   channel TLVs will be added past this for each scan command, preserving
 499          *   the TLVs that were previously added.
 500          */
 501         *ppchantlvout = (struct mrvlietypes_chanlistparamset *) ptlvpos;
 502
 503         if (puserscanin && puserscanin->chanlist[0].channumber) {
 504
 505                 lbs_deb_scan("Scan: Using supplied channel list\n");
 506
 507                 for (chanidx = 0;
 508                      chanidx < WLAN_IOCTL_USER_SCAN_CHAN_MAX
 509                      && puserscanin->chanlist[chanidx].channumber; chanidx++) {
 510
 511                         channel = puserscanin->chanlist[chanidx].channumber;
 512                         (pscanchanlist + chanidx)->channumber = channel;
 513
 514                         radiotype = puserscanin->chanlist[chanidx].radiotype;
 515                         (pscanchanlist + chanidx)->radiotype = radiotype;
 516
 517                         scantype = puserscanin->chanlist[chanidx].scantype;
 518
 519                         if (scantype == cmd_scan_type_passive) {
 520                                 (pscanchanlist +
 521                                  chanidx)->chanscanmode.passivescan = 1;
 522                         } else {
 523                                 (pscanchanlist +
 524                                  chanidx)->chanscanmode.passivescan = 0;
 525                         }
 526
 527                         if (puserscanin->chanlist[chanidx].scantime) {
 528                                 scandur =
 529                                     puserscanin->chanlist[chanidx].scantime;
 530                         } else {
 531                                 if (scantype == cmd_scan_type_passive) {
 532                                         scandur = MRVDRV_PASSIVE_SCAN_CHAN_TIME;
 533                                 } else {
 534                                         scandur = MRVDRV_ACTIVE_SCAN_CHAN_TIME;
 535                                 }
 536                         }
 537
 538                         (pscanchanlist + chanidx)->minscantime =
 539                             cpu_to_le16(scandur);
 540                         (pscanchanlist + chanidx)->maxscantime =
 541                             cpu_to_le16(scandur);
 542                 }
 543
 544                 /* Check if we are only scanning the current channel */
 545                 if ((chanidx == 1) && (puserscanin->chanlist[0].channumber
 546                                        ==
 547                                        priv->adapter->curbssparams.channel)) {
 548                         *pscancurrentonly = 1;
 549                         lbs_deb_scan("Scan: Scanning current channel only");
 550                 }
 551
 552         } else {
 553                 lbs_deb_scan("Scan: Creating full region channel list\n");
 554                 wlan_scan_create_channel_list(priv, pscanchanlist,
 555                                               *pfilteredscan);
 556         }
 557
 558 out:
 559         return pscancfgout;
 560 }
 561
 562 /**
 563  *  @brief Construct and send multiple scan config commands to the firmware
 564  *
 565  *  Previous routines have created a wlan_scan_cmd_config with any requested
 566  *   TLVs.  This function splits the channel TLV into maxchanperscan lists
 567  *   and sends the portion of the channel TLV along with the other TLVs
 568  *   to the wlan_cmd routines for execution in the firmware.
 569  *
 570  *  @param priv            A pointer to wlan_private structure
 571  *  @param maxchanperscan  Maximum number channels to be included in each
 572  *                         scan command sent to firmware
 573  *  @param filteredscan    Flag indicating whether or not a BSSID or SSID
 574  *                         filter is being used for the firmware command
 575  *                         scan command sent to firmware
 576  *  @param pscancfgout     Scan configuration used for this scan.
 577  *  @param pchantlvout     Pointer in the pscancfgout where the channel TLV
 578  *                         should start.  This is past any other TLVs that
 579  *                         must be sent down in each firmware command.
 580  *  @param pscanchanlist   List of channels to scan in maxchanperscan segments
 581  *
 582  *  @return                0 or error return otherwise
 583  */
 584 static int wlan_scan_channel_list(wlan_private * priv,
 585                                   int maxchanperscan,
 586                                   u8 filteredscan,
 587                                   struct wlan_scan_cmd_config * pscancfgout,
 588                                   struct mrvlietypes_chanlistparamset * pchantlvout,
 589                                   struct chanscanparamset * pscanchanlist,
 590                                   const struct wlan_ioctl_user_scan_cfg * puserscanin,
 591                                   int full_scan)
 592 {
 593         struct chanscanparamset *ptmpchan;
 594         struct chanscanparamset *pstartchan;
 595         u8 scanband;
 596         int doneearly;
 597         int tlvidx;
 598         int ret = 0;
 599         int scanned = 0;
 600         union iwreq_data wrqu;
 601
 602         lbs_deb_enter(LBS_DEB_ASSOC);
 603
 604         if (pscancfgout == 0 || pchantlvout == 0 || pscanchanlist == 0) {
 605                 lbs_deb_scan("Scan: Null detect: %p, %p, %p\n",
 606                        pscancfgout, pchantlvout, pscanchanlist);
 607                 return -1;
 608         }
 609
 610         pchantlvout->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 611
 612         /* Set the temp channel struct pointer to the start of the desired list */
 613         ptmpchan = pscanchanlist;
 614
 615         if (priv->adapter->last_scanned_channel && !puserscanin)
 616                 ptmpchan += priv->adapter->last_scanned_channel;
 617
 618         /* Loop through the desired channel list, sending a new firmware scan
 619          *   commands for each maxchanperscan channels (or for 1,6,11 individually
 620          *   if configured accordingly)
 621          */
 622         while (ptmpchan->channumber) {
 623
 624                 tlvidx = 0;
 625                 pchantlvout->header.len = 0;
 626                 scanband = ptmpchan->radiotype;
 627                 pstartchan = ptmpchan;
 628                 doneearly = 0;
 629
 630                 /* Construct the channel TLV for the scan command.  Continue to
 631                  *  insert channel TLVs until:
 632                  *    - the tlvidx hits the maximum configured per scan command
 633                  *    - the next channel to insert is 0 (end of desired channel list)
 634                  *    - doneearly is set (controlling individual scanning of 1,6,11)
 635                  */
 636                 while (tlvidx < maxchanperscan && ptmpchan->channumber
 637                        && !doneearly && scanned < 2) {
 638
 639             lbs_deb_scan(
 640                     "Scan: Chan(%3d), Radio(%d), mode(%d,%d), Dur(%d)\n",
 641                 ptmpchan->channumber, ptmpchan->radiotype,
 642                 ptmpchan->chanscanmode.passivescan,
 643                 ptmpchan->chanscanmode.disablechanfilt,
 644                 ptmpchan->maxscantime);
 645
 646                         /* Copy the current channel TLV to the command being prepared */
 647                         memcpy(pchantlvout->chanscanparam + tlvidx,
 648                                ptmpchan, sizeof(pchantlvout->chanscanparam));
 649
 650                         /* Increment the TLV header length by the size appended */
 651                         /* Ew, it would be _so_ nice if we could just declare the
 652                            variable little-endian and let GCC handle it for us */
 653                         pchantlvout->header.len =
 654                                 cpu_to_le16(le16_to_cpu(pchantlvout->header.len) +
 655                                             sizeof(pchantlvout->chanscanparam));
 656
 657                         /*
 658                          *  The tlv buffer length is set to the number of bytes of the
 659                          *    between the channel tlv pointer and the start of the
 660                          *    tlv buffer.  This compensates for any TLVs that were appended
 661                          *    before the channel list.
 662                          */
 663                         pscancfgout->tlvbufferlen = ((u8 *) pchantlvout
 664                                                      - pscancfgout->tlvbuffer);
 665
 666                         /*  Add the size of the channel tlv header and the data length */
 667                         pscancfgout->tlvbufferlen +=
 668                             (sizeof(pchantlvout->header)
 669                              + le16_to_cpu(pchantlvout->header.len));
 670
 671                         /* Increment the index to the channel tlv we are constructing */
 672                         tlvidx++;
 673
 674                         doneearly = 0;
 675
 676                         /* Stop the loop if the *current* channel is in the 1,6,11 set
 677                          *   and we are not filtering on a BSSID or SSID.
 678                          */
 679                         if (!filteredscan && (ptmpchan->channumber == 1
 680                                               || ptmpchan->channumber == 6
 681                                               || ptmpchan->channumber == 11)) {
 682                                 doneearly = 1;
 683                         }
 684
 685                         /* Increment the tmp pointer to the next channel to be scanned */
 686                         ptmpchan++;
 687                         scanned++;
 688
 689                         /* Stop the loop if the *next* channel is in the 1,6,11 set.
 690                          *  This will cause it to be the only channel scanned on the next
 691                          *  interation
 692                          */
 693                         if (!filteredscan && (ptmpchan->channumber == 1
 694                                               || ptmpchan->channumber == 6
 695                                               || ptmpchan->channumber == 11)) {
 696                                 doneearly = 1;
 697                         }
 698                 }
 699
 700                 /* Send the scan command to the firmware with the specified cfg */
 701                 ret = libertas_prepare_and_send_command(priv, cmd_802_11_scan, 0,
 702                                             0, 0, pscancfgout);
 703                 if (scanned >= 2 && !full_scan) {
 704                         ret = 0;
 705                         goto done;
 706                 }
 707                 scanned = 0;
 708         }
 709
 710 done:
 711         priv->adapter->last_scanned_channel = ptmpchan->channumber;
 712
 713         /* Tell userspace the scan table has been updated */
 714         memset(&wrqu, 0, sizeof(union iwreq_data));
 715         wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
 716
 717         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 718         return ret;
 719 }
 720
 721 static void
 722 clear_selected_scan_list_entries(wlan_adapter * adapter,
 723                                  const struct wlan_ioctl_user_scan_cfg * scan_cfg)
 724 {
 725         struct bss_descriptor * bss;
 726         struct bss_descriptor * safe;
 727         u32 clear_ssid_flag = 0, clear_bssid_flag = 0;
 728
 729         if (!scan_cfg)
 730                 return;
 731
 732         if (scan_cfg->clear_ssid && scan_cfg->ssid_len)
 733                 clear_ssid_flag = 1;
 734
 735         if (scan_cfg->clear_bssid
 736             && (compare_ether_addr(scan_cfg->bssid, &zeromac[0]) != 0)
 737             && (compare_ether_addr(scan_cfg->bssid, &bcastmac[0]) != 0)) {
 738                 clear_bssid_flag = 1;
 739         }
 740
 741         if (!clear_ssid_flag && !clear_bssid_flag)
 742                 return;
 743
 744         mutex_lock(&adapter->lock);
 745         list_for_each_entry_safe (bss, safe, &adapter->network_list, list) {
 746                 u32 clear = 0;
 747
 748                 /* Check for an SSID match */
 749                 if (   clear_ssid_flag
 750                     && (bss->ssid.ssidlength == scan_cfg->ssid_len)
 751                     && !memcmp(bss->ssid.ssid, scan_cfg->ssid, bss->ssid.ssidlength))
 752                         clear = 1;
 753
 754                 /* Check for a BSSID match */
 755                 if (   clear_bssid_flag
 756                     && !compare_ether_addr(bss->bssid, scan_cfg->bssid))
 757                         clear = 1;
 758
 759                 if (clear) {
 760                         list_move_tail (&bss->list, &adapter->network_free_list);
 761                         clear_bss_descriptor(bss);
 762                 }
 763         }
 764         mutex_unlock(&adapter->lock);
 765 }
 766
 767
 768 /**
 769  *  @brief Internal function used to start a scan based on an input config
 770  *
 771  *  Use the input user scan configuration information when provided in
 772  *    order to send the appropriate scan commands to firmware to populate or
 773  *    update the internal driver scan table
 774  *
 775  *  @param priv          A pointer to wlan_private structure
 776  *  @param puserscanin   Pointer to the input configuration for the requested
 777  *                       scan.
 778  *
 779  *  @return              0 or < 0 if error
 780  */
 781 int wlan_scan_networks(wlan_private * priv,
 782                               const struct wlan_ioctl_user_scan_cfg * puserscanin,
 783                               int full_scan)
 784 {
 785         wlan_adapter * adapter = priv->adapter;
 786         struct mrvlietypes_chanlistparamset *pchantlvout;
 787         struct chanscanparamset * scan_chan_list = NULL;
 788         struct wlan_scan_cmd_config * scan_cfg = NULL;
 789         u8 filteredscan;
 790         u8 scancurrentchanonly;
 791         int maxchanperscan;
 792         int ret;
 793
 794         lbs_deb_enter(LBS_DEB_ASSOC);
 795
 796         scan_chan_list = kzalloc(sizeof(struct chanscanparamset) *
 797                                 WLAN_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
 798         if (scan_chan_list == NULL) {
 799                 ret = -ENOMEM;
 800                 goto out;
 801         }
 802
 803         scan_cfg = wlan_scan_setup_scan_config(priv,
 804                                                puserscanin,
 805                                                &pchantlvout,
 806                                                scan_chan_list,
 807                                                &maxchanperscan,
 808                                                &filteredscan,
 809                                                &scancurrentchanonly);
 810         if (scan_cfg == NULL) {
 811                 ret = -ENOMEM;
 812                 goto out;
 813         }
 814
 815         clear_selected_scan_list_entries(adapter, puserscanin);
 816
 817         /* Keep the data path active if we are only scanning our current channel */
 818         if (!scancurrentchanonly) {
 819                 netif_stop_queue(priv->dev);
 820                 netif_carrier_off(priv->dev);
 821                 netif_stop_queue(priv->mesh_dev);
 822                 netif_carrier_off(priv->mesh_dev);
 823         }
 824
 825         ret = wlan_scan_channel_list(priv,
 826                                      maxchanperscan,
 827                                      filteredscan,
 828                                      scan_cfg,
 829                                      pchantlvout,
 830                                      scan_chan_list,
 831                                      puserscanin,
 832                                      full_scan);
 833
 834         /*  Process the resulting scan table:
 835          *    - Remove any bad ssids
 836          *    - Update our current BSS information from scan data
 837          */
 838         wlan_scan_process_results(priv);
 839
 840         if (priv->adapter->connect_status == libertas_connected) {
 841                 netif_carrier_on(priv->dev);
 842                 netif_wake_queue(priv->dev);
 843                 netif_carrier_on(priv->mesh_dev);
 844                 netif_wake_queue(priv->mesh_dev);
 845         }
 846
 847 out:
 848         if (scan_cfg)
 849                 kfree(scan_cfg);
 850
 851         if (scan_chan_list)
 852                 kfree(scan_chan_list);
 853
 854         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 855         return ret;
 856 }
 857
 858 /**
 859  *  @brief Inspect the scan response buffer for pointers to expected TLVs
 860  *
 861  *  TLVs can be included at the end of the scan response BSS information.
 862  *    Parse the data in the buffer for pointers to TLVs that can potentially
 863  *    be passed back in the response
 864  *
 865  *  @param ptlv        Pointer to the start of the TLV buffer to parse
 866  *  @param tlvbufsize  size of the TLV buffer
 867  *  @param ptsftlv     Output parameter: Pointer to the TSF TLV if found
 868  *
 869  *  @return            void
 870  */
 871 static
 872 void wlan_ret_802_11_scan_get_tlv_ptrs(struct mrvlietypes_data * ptlv,
 873                                        int tlvbufsize,
 874                                        struct mrvlietypes_tsftimestamp ** ptsftlv)
 875 {
 876         struct mrvlietypes_data *pcurrenttlv;
 877         int tlvbufleft;
 878         u16 tlvtype;
 879         u16 tlvlen;
 880
 881         pcurrenttlv = ptlv;
 882         tlvbufleft = tlvbufsize;
 883         *ptsftlv = NULL;
 884
 885         lbs_deb_scan("SCAN_RESP: tlvbufsize = %d\n", tlvbufsize);
 886         lbs_dbg_hex("SCAN_RESP: TLV Buf", (u8 *) ptlv, tlvbufsize);
 887
 888         while (tlvbufleft >= sizeof(struct mrvlietypesheader)) {
 889                 tlvtype = le16_to_cpu(pcurrenttlv->header.type);
 890                 tlvlen = le16_to_cpu(pcurrenttlv->header.len);
 891
 892                 switch (tlvtype) {
 893                 case TLV_TYPE_TSFTIMESTAMP:
 894                         *ptsftlv = (struct mrvlietypes_tsftimestamp *) pcurrenttlv;
 895                         break;
 896
 897                 default:
 898                         lbs_deb_scan("SCAN_RESP: Unhandled TLV = %d\n",
 899                                tlvtype);
 900                         /* Give up, this seems corrupted */
 901                         return;
 902                 }               /* switch */
 903
 904                 tlvbufleft -= (sizeof(ptlv->header) + tlvlen);
 905                 pcurrenttlv =
 906                     (struct mrvlietypes_data *) (pcurrenttlv->Data + tlvlen);
 907         }                       /* while */
 908 }
 909
 910 /**
 911  *  @brief Interpret a BSS scan response returned from the firmware
 912  *
 913  *  Parse the various fixed fields and IEs passed back for a a BSS probe
 914  *   response or beacon from the scan command.  Record information as needed
 915  *   in the scan table struct bss_descriptor for that entry.
 916  *
 917  *  @param bss  Output parameter: Pointer to the BSS Entry
 918  *
 919  *  @return             0 or -1
 920  */
 921 static int libertas_process_bss(struct bss_descriptor * bss,
 922                                 u8 ** pbeaconinfo, int *bytesleft)
 923 {
 924         enum ieeetypes_elementid elemID;
 925         struct ieeetypes_fhparamset *pFH;
 926         struct ieeetypes_dsparamset *pDS;
 927         struct ieeetypes_cfparamset *pCF;
 928         struct ieeetypes_ibssparamset *pibss;
 929         struct ieeetypes_capinfo *pcap;
 930         struct WLAN_802_11_FIXED_IEs fixedie;
 931         u8 *pcurrentptr;
 932         u8 *pRate;
 933         u8 elemlen;
 934         u8 bytestocopy;
 935         u8 ratesize;
 936         u16 beaconsize;
 937         u8 founddatarateie;
 938         int bytesleftforcurrentbeacon;
 939         int ret;
 940
 941         struct IE_WPA *pIe;
 942         const u8 oui01[4] = { 0x00, 0x50, 0xf2, 0x01 };
 943
 944         struct ieeetypes_countryinfoset *pcountryinfo;
 945
 946         lbs_deb_enter(LBS_DEB_ASSOC);
 947
 948         founddatarateie = 0;
 949         ratesize = 0;
 950         beaconsize = 0;
 951
 952         if (*bytesleft >= sizeof(beaconsize)) {
 953                 /* Extract & convert beacon size from the command buffer */
 954                 beaconsize = le16_to_cpup((void *)*pbeaconinfo);
 955                 *bytesleft -= sizeof(beaconsize);
 956                 *pbeaconinfo += sizeof(beaconsize);
 957         }
 958
 959         if (beaconsize == 0 || beaconsize > *bytesleft) {
 960
 961                 *pbeaconinfo += *bytesleft;
 962                 *bytesleft = 0;
 963
 964                 return -1;
 965         }
 966
 967         /* Initialize the current working beacon pointer for this BSS iteration */
 968         pcurrentptr = *pbeaconinfo;
 969
 970         /* Advance the return beacon pointer past the current beacon */
 971         *pbeaconinfo += beaconsize;
 972         *bytesleft -= beaconsize;
 973
 974         bytesleftforcurrentbeacon = beaconsize;
 975
 976         memcpy(bss->bssid, pcurrentptr, ETH_ALEN);
 977         lbs_deb_scan("process_bss: AP BSSID " MAC_FMT "\n", MAC_ARG(bss->bssid));
 978
 979         pcurrentptr += ETH_ALEN;
 980         bytesleftforcurrentbeacon -= ETH_ALEN;
 981
 982         if (bytesleftforcurrentbeacon < 12) {
 983                 lbs_deb_scan("process_bss: Not enough bytes left\n");
 984                 return -1;
 985         }
 986
 987         /*
 988          * next 4 fields are RSSI, time stamp, beacon interval,
 989          *   and capability information
 990          */
 991
 992         /* RSSI is 1 byte long */
 993         bss->rssi = *pcurrentptr;
 994         lbs_deb_scan("process_bss: RSSI=%02X\n", *pcurrentptr);
 995         pcurrentptr += 1;
 996         bytesleftforcurrentbeacon -= 1;
 997
 998         /* time stamp is 8 bytes long */
 999         fixedie.timestamp = bss->timestamp = le64_to_cpup((void *)pcurrentptr);
1000         pcurrentptr += 8;
1001         bytesleftforcurrentbeacon -= 8;
1002
1003         /* beacon interval is 2 bytes long */
1004         fixedie.beaconinterval = bss->beaconperiod = le16_to_cpup((void *)pcurrentptr);
1005         pcurrentptr += 2;
1006         bytesleftforcurrentbeacon -= 2;
1007
1008         /* capability information is 2 bytes long */
1009         memcpy(&fixedie.capabilities, pcurrentptr, 2);
1010         lbs_deb_scan("process_bss: fixedie.capabilities=0x%X\n",
1011                fixedie.capabilities);
1012         pcap = (struct ieeetypes_capinfo *) & fixedie.capabilities;
1013         memcpy(&bss->cap, pcap, sizeof(struct ieeetypes_capinfo));
1014         pcurrentptr += 2;
1015         bytesleftforcurrentbeacon -= 2;
1016
1017         /* rest of the current buffer are IE's */
1018         lbs_deb_scan("process_bss: IE length for this AP = %d\n",
1019                bytesleftforcurrentbeacon);
1020
1021         lbs_dbg_hex("process_bss: IE info", (u8 *) pcurrentptr,
1022                 bytesleftforcurrentbeacon);
1023
1024         if (pcap->privacy) {
1025                 lbs_deb_scan("process_bss: AP WEP enabled\n");
1026                 bss->privacy = wlan802_11privfilter8021xWEP;
1027         } else {
1028                 bss->privacy = wlan802_11privfilteracceptall;
1029         }
1030
1031         if (pcap->ibss == 1) {
1032                 bss->mode = IW_MODE_ADHOC;
1033         } else {
1034                 bss->mode = IW_MODE_INFRA;
1035         }
1036
1037         /* process variable IE */
1038         while (bytesleftforcurrentbeacon >= 2) {
1039                 elemID = (enum ieeetypes_elementid) (*((u8 *) pcurrentptr));
1040                 elemlen = *((u8 *) pcurrentptr + 1);
1041
1042                 if (bytesleftforcurrentbeacon < elemlen) {
1043                         lbs_deb_scan("process_bss: error in processing IE, "
1044                                "bytes left < IE length\n");
1045                         bytesleftforcurrentbeacon = 0;
1046                         continue;
1047                 }
1048
1049                 switch (elemID) {
1050                 case SSID:
1051                         bss->ssid.ssidlength = elemlen;
1052                         memcpy(bss->ssid.ssid, (pcurrentptr + 2), elemlen);
1053                         lbs_deb_scan("ssid '%s'\n", bss->ssid.ssid);
1054                         break;
1055
1056                 case SUPPORTED_RATES:
1057                         memcpy(bss->datarates, (pcurrentptr + 2), elemlen);
1058                         memmove(bss->libertas_supported_rates, (pcurrentptr + 2),
1059                                 elemlen);
1060                         ratesize = elemlen;
1061                         founddatarateie = 1;
1062                         break;
1063
1064                 case EXTRA_IE:
1065                         lbs_deb_scan("process_bss: EXTRA_IE Found!\n");
1066                         break;
1067
1068                 case FH_PARAM_SET:
1069                         pFH = (struct ieeetypes_fhparamset *) pcurrentptr;
1070                         memmove(&bss->phyparamset.fhparamset, pFH,
1071                                 sizeof(struct ieeetypes_fhparamset));
1072 #if 0 /* I think we can store these LE */
1073                         bss->phyparamset.fhparamset.dwelltime
1074                             = le16_to_cpu(bss->phyparamset.fhparamset.dwelltime);
1075 #endif
1076                         break;
1077
1078                 case DS_PARAM_SET:
1079                         pDS = (struct ieeetypes_dsparamset *) pcurrentptr;
1080                         bss->channel = pDS->currentchan;
1081                         memcpy(&bss->phyparamset.dsparamset, pDS,
1082                                sizeof(struct ieeetypes_dsparamset));
1083                         break;
1084
1085                 case CF_PARAM_SET:
1086                         pCF = (struct ieeetypes_cfparamset *) pcurrentptr;
1087                         memcpy(&bss->ssparamset.cfparamset, pCF,
1088                                sizeof(struct ieeetypes_cfparamset));
1089                         break;
1090
1091                 case IBSS_PARAM_SET:
1092                         pibss = (struct ieeetypes_ibssparamset *) pcurrentptr;
1093                         bss->atimwindow = le32_to_cpu(pibss->atimwindow);
1094                         memmove(&bss->ssparamset.ibssparamset, pibss,
1095                                 sizeof(struct ieeetypes_ibssparamset));
1096 #if 0
1097                         bss->ssparamset.ibssparamset.atimwindow
1098                             = le16_to_cpu(bss->ssparamset.ibssparamset.atimwindow);
1099 #endif
1100                         break;
1101
1102                         /* Handle Country Info IE */
1103                 case COUNTRY_INFO:
1104                         pcountryinfo = (struct ieeetypes_countryinfoset *) pcurrentptr;
1105                         if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
1106                             || pcountryinfo->len > 254) {
1107                                 lbs_deb_scan("process_bss: 11D- Err "
1108                                        "CountryInfo len =%d min=%zd max=254\n",
1109                                        pcountryinfo->len,
1110                                        sizeof(pcountryinfo->countrycode));
1111                                 ret = -1;
1112                                 goto done;
1113                         }
1114
1115                         memcpy(&bss->countryinfo,
1116                                pcountryinfo, pcountryinfo->len + 2);
1117                         lbs_dbg_hex("process_bss: 11D- CountryInfo:",
1118                                 (u8 *) pcountryinfo,
1119                                 (u32) (pcountryinfo->len + 2));
1120                         break;
1121
1122                 case EXTENDED_SUPPORTED_RATES:
1123                         /*
1124                          * only process extended supported rate
1125                          * if data rate is already found.
1126                          * data rate IE should come before
1127                          * extended supported rate IE
1128                          */
1129                         if (founddatarateie) {
1130                                 if ((elemlen + ratesize) > WLAN_SUPPORTED_RATES) {
1131                                         bytestocopy =
1132                                             (WLAN_SUPPORTED_RATES - ratesize);
1133                                 } else {
1134                                         bytestocopy = elemlen;
1135                                 }
1136
1137                                 pRate = (u8 *) bss->datarates;
1138                                 pRate += ratesize;
1139                                 memmove(pRate, (pcurrentptr + 2), bytestocopy);
1140                                 pRate = (u8 *) bss->libertas_supported_rates;
1141                                 pRate += ratesize;
1142                                 memmove(pRate, (pcurrentptr + 2), bytestocopy);
1143                         }
1144                         break;
1145
1146                 case VENDOR_SPECIFIC_221:
1147 #define IE_ID_LEN_FIELDS_BYTES 2
1148                         pIe = (struct IE_WPA *)pcurrentptr;
1149
1150                         if (memcmp(pIe->oui, oui01, sizeof(oui01)))
1151                                 break;
1152
1153                         bss->wpa_ie_len = min(elemlen + IE_ID_LEN_FIELDS_BYTES,
1154                                 MAX_WPA_IE_LEN);
1155                         memcpy(bss->wpa_ie, pcurrentptr, bss->wpa_ie_len);
1156                         lbs_dbg_hex("process_bss: WPA IE", bss->wpa_ie, elemlen);
1157                         break;
1158                 case WPA2_IE:
1159                         pIe = (struct IE_WPA *)pcurrentptr;
1160                         bss->rsn_ie_len = min(elemlen + IE_ID_LEN_FIELDS_BYTES,
1161                                 MAX_WPA_IE_LEN);
1162                         memcpy(bss->rsn_ie, pcurrentptr, bss->rsn_ie_len);
1163                         lbs_dbg_hex("process_bss: RSN_IE", bss->rsn_ie, elemlen);
1164                         break;
1165                 case TIM:
1166                         break;
1167
1168                 case CHALLENGE_TEXT:
1169                         break;
1170                 }
1171
1172                 pcurrentptr += elemlen + 2;
1173
1174                 /* need to account for IE ID and IE len */
1175                 bytesleftforcurrentbeacon -= (elemlen + 2);
1176
1177         }                       /* while (bytesleftforcurrentbeacon > 2) */
1178
1179         /* Timestamp */
1180         bss->last_scanned = jiffies;
1181
1182         ret = 0;
1183
1184 done:
1185         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1186         return ret;
1187 }
1188
1189 /**
1190  *  @brief Compare two SSIDs
1191  *
1192  *  @param ssid1    A pointer to ssid to compare
1193  *  @param ssid2    A pointer to ssid to compare
1194  *
1195  *  @return         0--ssid is same, otherwise is different
1196  */
1197 int libertas_SSID_cmp(struct WLAN_802_11_SSID *ssid1, struct WLAN_802_11_SSID *ssid2)
1198 {
1199         if (!ssid1 || !ssid2)
1200                 return -1;
1201
1202         if (ssid1->ssidlength != ssid2->ssidlength)
1203                 return -1;
1204
1205         return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssidlength);
1206 }
1207
1208 /**
1209  *  @brief This function finds a specific compatible BSSID in the scan list
1210  *
1211  *  @param adapter  A pointer to wlan_adapter
1212  *  @param bssid    BSSID to find in the scan list
1213  *  @param mode     Network mode: Infrastructure or IBSS
1214  *
1215  *  @return         index in BSSID list, or error return code (< 0)
1216  */
1217 struct bss_descriptor * libertas_find_BSSID_in_list(wlan_adapter * adapter,
1218                 u8 * bssid, u8 mode)
1219 {
1220         struct bss_descriptor * iter_bss;
1221         struct bss_descriptor * found_bss = NULL;
1222
1223         if (!bssid)
1224                 return NULL;
1225
1226         lbs_dbg_hex("libertas_find_BSSID_in_list: looking for ",
1227                 bssid, ETH_ALEN);
1228
1229         /* Look through the scan table for a compatible match.  The loop will
1230          *   continue past a matched bssid that is not compatible in case there
1231          *   is an AP with multiple SSIDs assigned to the same BSSID
1232          */
1233         mutex_lock(&adapter->lock);
1234         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1235                 if (compare_ether_addr(iter_bss->bssid, bssid))
1236                         continue; /* bssid doesn't match */
1237                 switch (mode) {
1238                 case IW_MODE_INFRA:
1239                 case IW_MODE_ADHOC:
1240                         if (!is_network_compatible(adapter, iter_bss, mode))
1241                                 break;
1242                         found_bss = iter_bss;
1243                         break;
1244                 default:
1245                         found_bss = iter_bss;
1246                         break;
1247                 }
1248         }
1249         mutex_unlock(&adapter->lock);
1250
1251         return found_bss;
1252 }
1253
1254 /**
1255  *  @brief This function finds ssid in ssid list.
1256  *
1257  *  @param adapter  A pointer to wlan_adapter
1258  *  @param ssid     SSID to find in the list
1259  *  @param bssid    BSSID to qualify the SSID selection (if provided)
1260  *  @param mode     Network mode: Infrastructure or IBSS
1261  *
1262  *  @return         index in BSSID list
1263  */
1264 struct bss_descriptor * libertas_find_SSID_in_list(wlan_adapter * adapter,
1265                    struct WLAN_802_11_SSID *ssid, u8 * bssid, u8 mode,
1266                    int channel)
1267 {
1268         u8 bestrssi = 0;
1269         struct bss_descriptor * iter_bss = NULL;
1270         struct bss_descriptor * found_bss = NULL;
1271         struct bss_descriptor * tmp_oldest = NULL;
1272
1273         mutex_lock(&adapter->lock);
1274
1275         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1276                 if (   !tmp_oldest
1277                     || (iter_bss->last_scanned < tmp_oldest->last_scanned))
1278                         tmp_oldest = iter_bss;
1279
1280                 if (libertas_SSID_cmp(&iter_bss->ssid, ssid) != 0)
1281                         continue; /* ssid doesn't match */
1282                 if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
1283                         continue; /* bssid doesn't match */
1284                 if ((channel > 0) && (iter_bss->channel != channel))
1285                         continue; /* channel doesn't match */
1286
1287                 switch (mode) {
1288                 case IW_MODE_INFRA:
1289                 case IW_MODE_ADHOC:
1290                         if (!is_network_compatible(adapter, iter_bss, mode))
1291                                 break;
1292
1293                         if (bssid) {
1294                                 /* Found requested BSSID */
1295                                 found_bss = iter_bss;
1296                                 goto out;
1297                         }
1298
1299                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1300                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1301                                 found_bss = iter_bss;
1302                         }
1303                         break;
1304                 case IW_MODE_AUTO:
1305                 default:
1306                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1307                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1308                                 found_bss = iter_bss;
1309                         }
1310                         break;
1311                 }
1312         }
1313
1314 out:
1315         mutex_unlock(&adapter->lock);
1316         return found_bss;
1317 }
1318
1319 /**
1320  *  @brief This function finds the best SSID in the Scan List
1321  *
1322  *  Search the scan table for the best SSID that also matches the current
1323  *   adapter network preference (infrastructure or adhoc)
1324  *
1325  *  @param adapter  A pointer to wlan_adapter
1326  *
1327  *  @return         index in BSSID list
1328  */
1329 struct bss_descriptor * libertas_find_best_SSID_in_list(wlan_adapter * adapter,
1330                 u8 mode)
1331 {
1332         u8 bestrssi = 0;
1333         struct bss_descriptor * iter_bss;
1334         struct bss_descriptor * best_bss = NULL;
1335
1336         mutex_lock(&adapter->lock);
1337
1338         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1339                 switch (mode) {
1340                 case IW_MODE_INFRA:
1341                 case IW_MODE_ADHOC:
1342                         if (!is_network_compatible(adapter, iter_bss, mode))
1343                                 break;
1344                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1345                                 break;
1346                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1347                         best_bss = iter_bss;
1348                         break;
1349                 case IW_MODE_AUTO:
1350                 default:
1351                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1352                                 break;
1353                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1354                         best_bss = iter_bss;
1355                         break;
1356                 }
1357         }
1358
1359         mutex_unlock(&adapter->lock);
1360         return best_bss;
1361 }
1362
1363 /**
1364  *  @brief Find the AP with specific ssid in the scan list
1365  *
1366  *  @param priv         A pointer to wlan_private structure
1367  *  @param pSSID        A pointer to AP's ssid
1368  *
1369  *  @return             0--success, otherwise--fail
1370  */
1371 int libertas_find_best_network_SSID(wlan_private * priv,
1372                                     struct WLAN_802_11_SSID *ssid,
1373                                     u8 preferred_mode, u8 *out_mode)
1374 {
1375         wlan_adapter *adapter = priv->adapter;
1376         int ret = -1;
1377         struct bss_descriptor * found;
1378
1379         lbs_deb_enter(LBS_DEB_ASSOC);
1380
1381         memset(ssid, 0, sizeof(struct WLAN_802_11_SSID));
1382
1383         wlan_scan_networks(priv, NULL, 1);
1384         if (adapter->surpriseremoved)
1385                 return -1;
1386
1387         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1388
1389         found = libertas_find_best_SSID_in_list(adapter, preferred_mode);
1390         if (found && (found->ssid.ssidlength > 0)) {
1391                 memcpy(ssid, &found->ssid, sizeof(struct WLAN_802_11_SSID));
1392                 *out_mode = found->mode;
1393                 ret = 0;
1394         }
1395
1396         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1397         return ret;
1398 }
1399
1400 /**
1401  *  @brief Scan Network
1402  *
1403  *  @param dev          A pointer to net_device structure
1404  *  @param info         A pointer to iw_request_info structure
1405  *  @param vwrq         A pointer to iw_param structure
1406  *  @param extra        A pointer to extra data buf
1407  *
1408  *  @return             0 --success, otherwise fail
1409  */
1410 int libertas_set_scan(struct net_device *dev, struct iw_request_info *info,
1411                   struct iw_param *vwrq, char *extra)
1412 {
1413         wlan_private *priv = dev->priv;
1414         wlan_adapter *adapter = priv->adapter;
1415
1416         lbs_deb_enter(LBS_DEB_SCAN);
1417
1418         wlan_scan_networks(priv, NULL, 0);
1419
1420         if (adapter->surpriseremoved)
1421                 return -1;
1422
1423         lbs_deb_leave(LBS_DEB_SCAN);
1424         return 0;
1425 }
1426
1427 /**
1428  *  @brief Send a scan command for all available channels filtered on a spec
1429  *
1430  *  @param priv             A pointer to wlan_private structure
1431  *  @param prequestedssid   A pointer to AP's ssid
1432  *  @param keeppreviousscan Flag used to save/clear scan table before scan
1433  *
1434  *  @return                0-success, otherwise fail
1435  */
1436 int libertas_send_specific_SSID_scan(wlan_private * priv,
1437                          struct WLAN_802_11_SSID *prequestedssid,
1438                          u8 clear_ssid)
1439 {
1440         wlan_adapter *adapter = priv->adapter;
1441         struct wlan_ioctl_user_scan_cfg scancfg;
1442         int ret = 0;
1443
1444         lbs_deb_enter(LBS_DEB_ASSOC);
1445
1446         if (prequestedssid == NULL)
1447                 goto out;
1448
1449         memset(&scancfg, 0x00, sizeof(scancfg));
1450         memcpy(scancfg.ssid, prequestedssid->ssid, prequestedssid->ssidlength);
1451         scancfg.ssid_len = prequestedssid->ssidlength;
1452         scancfg.clear_ssid = clear_ssid;
1453
1454         wlan_scan_networks(priv, &scancfg, 1);
1455         if (adapter->surpriseremoved)
1456                 return -1;
1457         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1458
1459 out:
1460         lbs_deb_leave(LBS_DEB_ASSOC);
1461         return ret;
1462 }
1463
1464 /**
1465  *  @brief scan an AP with specific BSSID
1466  *
1467  *  @param priv             A pointer to wlan_private structure
1468  *  @param bssid            A pointer to AP's bssid
1469  *  @param keeppreviousscan Flag used to save/clear scan table before scan
1470  *
1471  *  @return          0-success, otherwise fail
1472  */
1473 int libertas_send_specific_BSSID_scan(wlan_private * priv, u8 * bssid, u8 clear_bssid)
1474 {
1475         struct wlan_ioctl_user_scan_cfg scancfg;
1476
1477         lbs_deb_enter(LBS_DEB_ASSOC);
1478
1479         if (bssid == NULL)
1480                 goto out;
1481
1482         memset(&scancfg, 0x00, sizeof(scancfg));
1483         memcpy(scancfg.bssid, bssid, ETH_ALEN);
1484         scancfg.clear_bssid = clear_bssid;
1485
1486         wlan_scan_networks(priv, &scancfg, 1);
1487         if (priv->adapter->surpriseremoved)
1488                 return -1;
1489         wait_event_interruptible(priv->adapter->cmd_pending,
1490                 !priv->adapter->nr_cmd_pending);
1491
1492 out:
1493         lbs_deb_leave(LBS_DEB_ASSOC);
1494         return 0;
1495 }
1496
1497 static inline char *libertas_translate_scan(wlan_private *priv,
1498                                         char *start, char *stop,
1499                                         struct bss_descriptor *bss)
1500 {
1501         wlan_adapter *adapter = priv->adapter;
1502         struct chan_freq_power *cfp;
1503         char *current_val;      /* For rates */
1504         struct iw_event iwe;    /* Temporary buffer */
1505         int j;
1506 #define PERFECT_RSSI ((u8)50)
1507 #define WORST_RSSI   ((u8)0)
1508 #define RSSI_DIFF    ((u8)(PERFECT_RSSI - WORST_RSSI))
1509         u8 rssi;
1510
1511         cfp = libertas_find_cfp_by_band_and_channel(adapter, 0, bss->channel);
1512         if (!cfp) {
1513                 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1514                 return NULL;
1515         }
1516
1517         /* First entry *MUST* be the AP BSSID */
1518         iwe.cmd = SIOCGIWAP;
1519         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1520         memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1521         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1522
1523         /* SSID */
1524         iwe.cmd = SIOCGIWESSID;
1525         iwe.u.data.flags = 1;
1526         iwe.u.data.length = min(bss->ssid.ssidlength, (u32) IW_ESSID_MAX_SIZE);
1527         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid.ssid);
1528
1529         /* Mode */
1530         iwe.cmd = SIOCGIWMODE;
1531         iwe.u.mode = bss->mode;
1532         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1533
1534         /* Frequency */
1535         iwe.cmd = SIOCGIWFREQ;
1536         iwe.u.freq.m = (long)cfp->freq * 100000;
1537         iwe.u.freq.e = 1;
1538         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1539
1540         /* Add quality statistics */
1541         iwe.cmd = IWEVQUAL;
1542         iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1543         iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1544
1545         rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1546         iwe.u.qual.qual =
1547             (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1548              (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1549             (RSSI_DIFF * RSSI_DIFF);
1550         if (iwe.u.qual.qual > 100)
1551                 iwe.u.qual.qual = 100;
1552
1553         if (adapter->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1554                 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1555         } else {
1556                 iwe.u.qual.noise =
1557                     CAL_NF(adapter->NF[TYPE_BEACON][TYPE_NOAVG]);
1558         }
1559
1560         /* Locally created ad-hoc BSSs won't have beacons if this is the
1561          * only station in the adhoc network; so get signal strength
1562          * from receive statistics.
1563          */
1564         if ((adapter->mode == IW_MODE_ADHOC)
1565             && adapter->adhoccreate
1566             && !libertas_SSID_cmp(&adapter->curbssparams.ssid, &bss->ssid)) {
1567                 int snr, nf;
1568                 snr = adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1569                 nf = adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1570                 iwe.u.qual.level = CAL_RSSI(snr, nf);
1571         }
1572         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
1573
1574         /* Add encryption capability */
1575         iwe.cmd = SIOCGIWENCODE;
1576         if (bss->privacy) {
1577                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1578         } else {
1579                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1580         }
1581         iwe.u.data.length = 0;
1582         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid.ssid);
1583
1584         current_val = start + IW_EV_LCP_LEN;
1585
1586         iwe.cmd = SIOCGIWRATE;
1587         iwe.u.bitrate.fixed = 0;
1588         iwe.u.bitrate.disabled = 0;
1589         iwe.u.bitrate.value = 0;
1590
1591         for (j = 0; j < sizeof(bss->libertas_supported_rates); j++) {
1592                 u8 rate = bss->libertas_supported_rates[j];
1593                 if (rate == 0)
1594                         break; /* no more rates */
1595                 /* Bit rate given in 500 kb/s units (+ 0x80) */
1596                 iwe.u.bitrate.value = (rate & 0x7f) * 500000;
1597                 current_val = iwe_stream_add_value(start, current_val,
1598                                          stop, &iwe, IW_EV_PARAM_LEN);
1599         }
1600         if ((bss->mode == IW_MODE_ADHOC)
1601             && !libertas_SSID_cmp(&adapter->curbssparams.ssid, &bss->ssid)
1602             && adapter->adhoccreate) {
1603                 iwe.u.bitrate.value = 22 * 500000;
1604                 current_val = iwe_stream_add_value(start, current_val,
1605                                          stop, &iwe, IW_EV_PARAM_LEN);
1606         }
1607         /* Check if we added any event */
1608         if((current_val - start) > IW_EV_LCP_LEN)
1609                 start = current_val;
1610
1611         memset(&iwe, 0, sizeof(iwe));
1612         if (bss->wpa_ie_len) {
1613                 char buf[MAX_WPA_IE_LEN];
1614                 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1615                 iwe.cmd = IWEVGENIE;
1616                 iwe.u.data.length = bss->wpa_ie_len;
1617                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1618         }
1619
1620         memset(&iwe, 0, sizeof(iwe));
1621         if (bss->rsn_ie_len) {
1622                 char buf[MAX_WPA_IE_LEN];
1623                 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1624                 iwe.cmd = IWEVGENIE;
1625                 iwe.u.data.length = bss->rsn_ie_len;
1626                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1627         }
1628
1629         return start;
1630 }
1631
1632 /**
1633  *  @brief  Retrieve the scan table entries via wireless tools IOCTL call
1634  *
1635  *  @param dev          A pointer to net_device structure
1636  *  @param info         A pointer to iw_request_info structure
1637  *  @param dwrq         A pointer to iw_point structure
1638  *  @param extra        A pointer to extra data buf
1639  *
1640  *  @return             0 --success, otherwise fail
1641  */
1642 int libertas_get_scan(struct net_device *dev, struct iw_request_info *info,
1643                   struct iw_point *dwrq, char *extra)
1644 {
1645 #define SCAN_ITEM_SIZE 128
1646         wlan_private *priv = dev->priv;
1647         wlan_adapter *adapter = priv->adapter;
1648         int err = 0;
1649         char *ev = extra;
1650         char *stop = ev + dwrq->length;
1651         struct bss_descriptor * iter_bss;
1652         struct bss_descriptor * safe;
1653
1654         lbs_deb_enter(LBS_DEB_ASSOC);
1655
1656         /* If we've got an uncompleted scan, schedule the next part */
1657         if (!adapter->nr_cmd_pending && adapter->last_scanned_channel)
1658                 wlan_scan_networks(priv, NULL, 0);
1659
1660         /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1661         if ((adapter->mode == IW_MODE_ADHOC) && adapter->adhoccreate) {
1662                 libertas_prepare_and_send_command(priv, cmd_802_11_rssi, 0,
1663                                         cmd_option_waitforrsp, 0, NULL);
1664         }
1665
1666         mutex_lock(&adapter->lock);
1667         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1668                 char * next_ev;
1669                 unsigned long stale_time;
1670
1671                 if (stop - ev < SCAN_ITEM_SIZE) {
1672                         err = -E2BIG;
1673                         break;
1674                 }
1675
1676                 /* Prune old an old scan result */
1677                 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1678                 if (time_after(jiffies, stale_time)) {
1679                         list_move_tail (&iter_bss->list,
1680                                         &adapter->network_free_list);
1681                         clear_bss_descriptor(iter_bss);
1682                         continue;
1683                 }
1684
1685                 /* Translate to WE format this entry */
1686                 next_ev = libertas_translate_scan(priv, ev, stop, iter_bss);
1687                 if (next_ev == NULL)
1688                         continue;
1689                 ev = next_ev;
1690         }
1691         mutex_unlock(&adapter->lock);
1692
1693         dwrq->length = (ev - extra);
1694         dwrq->flags = 0;
1695
1696         lbs_deb_leave(LBS_DEB_ASSOC);
1697         return err;
1698 }
1699
1700 /**
1701  *  @brief Prepare a scan command to be sent to the firmware
1702  *
1703  *  Use the wlan_scan_cmd_config sent to the command processing module in
1704  *   the libertas_prepare_and_send_command to configure a cmd_ds_802_11_scan command
1705  *   struct to send to firmware.
1706  *
1707  *  The fixed fields specifying the BSS type and BSSID filters as well as a
1708  *   variable number/length of TLVs are sent in the command to firmware.
1709  *
1710  *  @param priv       A pointer to wlan_private structure
1711  *  @param cmd        A pointer to cmd_ds_command structure to be sent to
1712  *                    firmware with the cmd_DS_801_11_SCAN structure
1713  *  @param pdata_buf  Void pointer cast of a wlan_scan_cmd_config struct used
1714  *                    to set the fields/TLVs for the command sent to firmware
1715  *
1716  *  @return           0 or -1
1717  *
1718  *  @sa wlan_scan_create_channel_list
1719  */
1720 int libertas_cmd_80211_scan(wlan_private * priv,
1721                          struct cmd_ds_command *cmd, void *pdata_buf)
1722 {
1723         struct cmd_ds_802_11_scan *pscan = &cmd->params.scan;
1724         struct wlan_scan_cmd_config *pscancfg;
1725
1726         lbs_deb_enter(LBS_DEB_ASSOC);
1727
1728         pscancfg = pdata_buf;
1729
1730         /* Set fixed field variables in scan command */
1731         pscan->bsstype = pscancfg->bsstype;
1732         memcpy(pscan->BSSID, pscancfg->bssid, sizeof(pscan->BSSID));
1733         memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen);
1734
1735         cmd->command = cpu_to_le16(cmd_802_11_scan);
1736
1737         /* size is equal to the sizeof(fixed portions) + the TLV len + header */
1738         cmd->size = cpu_to_le16(sizeof(pscan->bsstype)
1739                                      + sizeof(pscan->BSSID)
1740                                      + pscancfg->tlvbufferlen + S_DS_GEN);
1741
1742         lbs_deb_scan("SCAN_CMD: command=%x, size=%x, seqnum=%x\n",
1743                      le16_to_cpu(cmd->command), le16_to_cpu(cmd->size),
1744                      le16_to_cpu(cmd->seqnum));
1745
1746         lbs_deb_leave(LBS_DEB_ASSOC);
1747         return 0;
1748 }
1749
1750 static inline int is_same_network(struct bss_descriptor *src,
1751                                   struct bss_descriptor *dst)
1752 {
1753         /* A network is only a duplicate if the channel, BSSID, and ESSID
1754          * all match.  We treat all <hidden> with the same BSSID and channel
1755          * as one network */
1756         return ((src->ssid.ssidlength == dst->ssid.ssidlength) &&
1757                 (src->channel == dst->channel) &&
1758                 !compare_ether_addr(src->bssid, dst->bssid) &&
1759                 !memcmp(src->ssid.ssid, dst->ssid.ssid, src->ssid.ssidlength));
1760 }
1761
1762 /**
1763  *  @brief This function handles the command response of scan
1764  *
1765  *   The response buffer for the scan command has the following
1766  *      memory layout:
1767  *
1768  *     .-----------------------------------------------------------.
1769  *     |  header (4 * sizeof(u16)):  Standard command response hdr |
1770  *     .-----------------------------------------------------------.
1771  *     |  bufsize (u16) : sizeof the BSS Description data          |
1772  *     .-----------------------------------------------------------.
1773  *     |  NumOfSet (u8) : Number of BSS Descs returned             |
1774  *     .-----------------------------------------------------------.
1775  *     |  BSSDescription data (variable, size given in bufsize)    |
1776  *     .-----------------------------------------------------------.
1777  *     |  TLV data (variable, size calculated using header->size,  |
1778  *     |            bufsize and sizeof the fixed fields above)     |
1779  *     .-----------------------------------------------------------.
1780  *
1781  *  @param priv    A pointer to wlan_private structure
1782  *  @param resp    A pointer to cmd_ds_command
1783  *
1784  *  @return        0 or -1
1785  */
1786 int libertas_ret_80211_scan(wlan_private * priv, struct cmd_ds_command *resp)
1787 {
1788         wlan_adapter *adapter = priv->adapter;
1789         struct cmd_ds_802_11_scan_rsp *pscan;
1790         struct mrvlietypes_data *ptlv;
1791         struct mrvlietypes_tsftimestamp *ptsftlv;
1792         struct bss_descriptor * iter_bss;
1793         struct bss_descriptor * safe;
1794         u8 *pbssinfo;
1795         u16 scanrespsize;
1796         int bytesleft;
1797         int idx;
1798         int tlvbufsize;
1799         int ret;
1800
1801         lbs_deb_enter(LBS_DEB_ASSOC);
1802
1803         /* Prune old entries from scan table */
1804         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1805                 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1806                 if (time_before(jiffies, stale_time))
1807                         continue;
1808                 list_move_tail (&iter_bss->list, &adapter->network_free_list);
1809                 clear_bss_descriptor(iter_bss);
1810         }
1811
1812         pscan = &resp->params.scanresp;
1813
1814         if (pscan->nr_sets > MAX_NETWORK_COUNT) {
1815                 lbs_deb_scan(
1816                        "SCAN_RESP: too many scan results (%d, max %d)!!\n",
1817                        pscan->nr_sets, MAX_NETWORK_COUNT);
1818                 ret = -1;
1819                 goto done;
1820         }
1821
1822         bytesleft = le16_to_cpu(pscan->bssdescriptsize);
1823         lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1824
1825         scanrespsize = le16_to_cpu(resp->size);
1826         lbs_deb_scan("SCAN_RESP: returned %d AP before parsing\n",
1827                pscan->nr_sets);
1828
1829         pbssinfo = pscan->bssdesc_and_tlvbuffer;
1830
1831         /* The size of the TLV buffer is equal to the entire command response
1832          *   size (scanrespsize) minus the fixed fields (sizeof()'s), the
1833          *   BSS Descriptions (bssdescriptsize as bytesLef) and the command
1834          *   response header (S_DS_GEN)
1835          */
1836         tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize)
1837                                      + sizeof(pscan->nr_sets)
1838                                      + S_DS_GEN);
1839
1840         ptlv = (struct mrvlietypes_data *) (pscan->bssdesc_and_tlvbuffer + bytesleft);
1841
1842         /* Search the TLV buffer space in the scan response for any valid TLVs */
1843         wlan_ret_802_11_scan_get_tlv_ptrs(ptlv, tlvbufsize, &ptsftlv);
1844
1845         /*
1846          *  Process each scan response returned (pscan->nr_sets).  Save
1847          *    the information in the newbssentry and then insert into the
1848          *    driver scan table either as an update to an existing entry
1849          *    or as an addition at the end of the table
1850          */
1851         for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) {
1852                 struct bss_descriptor new;
1853                 struct bss_descriptor * found = NULL;
1854                 struct bss_descriptor * oldest = NULL;
1855
1856                 /* Process the data fields and IEs returned for this BSS */
1857                 memset(&new, 0, sizeof (struct bss_descriptor));
1858                 if (libertas_process_bss(&new, &pbssinfo, &bytesleft) != 0) {
1859                         /* error parsing the scan response, skipped */
1860                         lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1861                         continue;
1862                 }
1863
1864                 /* Try to find this bss in the scan table */
1865                 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1866                         if (is_same_network(iter_bss, &new)) {
1867                                 found = iter_bss;
1868                                 break;
1869                         }
1870
1871                         if ((oldest == NULL) ||
1872                             (iter_bss->last_scanned < oldest->last_scanned))
1873                                 oldest = iter_bss;
1874                 }
1875
1876                 if (found) {
1877                         /* found, clear it */
1878                         clear_bss_descriptor(found);
1879                 } else if (!list_empty(&adapter->network_free_list)) {
1880                         /* Pull one from the free list */
1881                         found = list_entry(adapter->network_free_list.next,
1882                                            struct bss_descriptor, list);
1883                         list_move_tail(&found->list, &adapter->network_list);
1884                 } else if (oldest) {
1885                         /* If there are no more slots, expire the oldest */
1886                         found = oldest;
1887                         clear_bss_descriptor(found);
1888                         list_move_tail(&found->list, &adapter->network_list);
1889                 } else {
1890                         continue;
1891                 }
1892
1893                 lbs_deb_scan("SCAN_RESP: BSSID = " MAC_FMT "\n",
1894                        new.bssid[0], new.bssid[1], new.bssid[2],
1895                        new.bssid[3], new.bssid[4], new.bssid[5]);
1896
1897                 /*
1898                  * If the TSF TLV was appended to the scan results, save the
1899                  *   this entries TSF value in the networktsf field.  The
1900                  *   networktsf is the firmware's TSF value at the time the
1901                  *   beacon or probe response was received.
1902                  */
1903                 if (ptsftlv) {
1904                         new.networktsf = le64_to_cpup(&ptsftlv->tsftable[idx]);
1905                 }
1906
1907                 /* Copy the locally created newbssentry to the scan table */
1908                 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1909         }
1910
1911         ret = 0;
1912
1913 done:
1914         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1915         return ret;
1916 }