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 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         int i = 0;
 236
 237         if (adapter->connect_status == libertas_connected)
 238                 return;
 239
 240         mutex_lock(&adapter->lock);
 241         list_for_each_entry (iter_bss, &adapter->network_list, list) {
 242                 lbs_deb_scan("Scan:(%02d) " MAC_FMT ", RSSI[%03d], SSID[%s]\n",
 243                        i++, MAC_ARG(iter_bss->bssid), (s32) iter_bss->rssi,
 244                        escape_essid(iter_bss->ssid, iter_bss->ssid_len));
 245         }
 246         mutex_unlock(&adapter->lock);
 247 }
 248
 249 /**
 250  *  @brief Create a channel list for the driver to scan based on region info
 251  *
 252  *  Use the driver region/band information to construct a comprehensive list
 253  *    of channels to scan.  This routine is used for any scan that is not
 254  *    provided a specific channel list to scan.
 255  *
 256  *  @param priv          A pointer to wlan_private structure
 257  *  @param scanchanlist  Output parameter: resulting channel list to scan
 258  *  @param filteredscan  Flag indicating whether or not a BSSID or SSID filter
 259  *                       is being sent in the command to firmware.  Used to
 260  *                       increase the number of channels sent in a scan
 261  *                       command and to disable the firmware channel scan
 262  *                       filter.
 263  *
 264  *  @return              void
 265  */
 266 static void wlan_scan_create_channel_list(wlan_private * priv,
 267                                           struct chanscanparamset * scanchanlist,
 268                                           u8 filteredscan)
 269 {
 270
 271         wlan_adapter *adapter = priv->adapter;
 272         struct region_channel *scanregion;
 273         struct chan_freq_power *cfp;
 274         int rgnidx;
 275         int chanidx;
 276         int nextchan;
 277         u8 scantype;
 278
 279         chanidx = 0;
 280
 281         /* Set the default scan type to the user specified type, will later
 282          *   be changed to passive on a per channel basis if restricted by
 283          *   regulatory requirements (11d or 11h)
 284          */
 285         scantype = adapter->scantype;
 286
 287         for (rgnidx = 0; rgnidx < ARRAY_SIZE(adapter->region_channel); rgnidx++) {
 288                 if (priv->adapter->enable11d &&
 289                     adapter->connect_status != libertas_connected) {
 290                         /* Scan all the supported chan for the first scan */
 291                         if (!adapter->universal_channel[rgnidx].valid)
 292                                 continue;
 293                         scanregion = &adapter->universal_channel[rgnidx];
 294
 295                         /* clear the parsed_region_chan for the first scan */
 296                         memset(&adapter->parsed_region_chan, 0x00,
 297                                sizeof(adapter->parsed_region_chan));
 298                 } else {
 299                         if (!adapter->region_channel[rgnidx].valid)
 300                                 continue;
 301                         scanregion = &adapter->region_channel[rgnidx];
 302                 }
 303
 304                 for (nextchan = 0;
 305                      nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
 306
 307                         cfp = scanregion->CFP + nextchan;
 308
 309                         if (priv->adapter->enable11d) {
 310                                 scantype =
 311                                     libertas_get_scan_type_11d(cfp->channel,
 312                                                            &adapter->
 313                                                            parsed_region_chan);
 314                         }
 315
 316                         switch (scanregion->band) {
 317                         case BAND_B:
 318                         case BAND_G:
 319                         default:
 320                                 scanchanlist[chanidx].radiotype =
 321                                     cmd_scan_radio_type_bg;
 322                                 break;
 323                         }
 324
 325                         if (scantype == cmd_scan_type_passive) {
 326                                 scanchanlist[chanidx].maxscantime =
 327                                     cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
 328                                 scanchanlist[chanidx].chanscanmode.passivescan =
 329                                     1;
 330                         } else {
 331                                 scanchanlist[chanidx].maxscantime =
 332                                     cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
 333                                 scanchanlist[chanidx].chanscanmode.passivescan =
 334                                     0;
 335                         }
 336
 337                         scanchanlist[chanidx].channumber = cfp->channel;
 338
 339                         if (filteredscan) {
 340                                 scanchanlist[chanidx].chanscanmode.
 341                                     disablechanfilt = 1;
 342                         }
 343                 }
 344         }
 345 }
 346
 347 /**
 348  *  @brief Construct a wlan_scan_cmd_config structure to use in issue scan cmds
 349  *
 350  *  Application layer or other functions can invoke wlan_scan_networks
 351  *    with a scan configuration supplied in a wlan_ioctl_user_scan_cfg struct.
 352  *    This structure is used as the basis of one or many wlan_scan_cmd_config
 353  *    commands that are sent to the command processing module and sent to
 354  *    firmware.
 355  *
 356  *  Create a wlan_scan_cmd_config based on the following user supplied
 357  *    parameters (if present):
 358  *             - SSID filter
 359  *             - BSSID filter
 360  *             - Number of Probes to be sent
 361  *             - channel list
 362  *
 363  *  If the SSID or BSSID filter is not present, disable/clear the filter.
 364  *  If the number of probes is not set, use the adapter default setting
 365  *  Qualify the channel
 366  *
 367  *  @param priv             A pointer to wlan_private structure
 368  *  @param puserscanin      NULL or pointer to scan configuration parameters
 369  *  @param ppchantlvout     Output parameter: Pointer to the start of the
 370  *                          channel TLV portion of the output scan config
 371  *  @param pscanchanlist    Output parameter: Pointer to the resulting channel
 372  *                          list to scan
 373  *  @param pmaxchanperscan  Output parameter: Number of channels to scan for
 374  *                          each issuance of the firmware scan command
 375  *  @param pfilteredscan    Output parameter: Flag indicating whether or not
 376  *                          a BSSID or SSID filter is being sent in the
 377  *                          command to firmware.  Used to increase the number
 378  *                          of channels sent in a scan command and to
 379  *                          disable the firmware channel scan filter.
 380  *  @param pscancurrentonly Output parameter: Flag indicating whether or not
 381  *                          we are only scanning our current active channel
 382  *
 383  *  @return                 resulting scan configuration
 384  */
 385 static struct wlan_scan_cmd_config *
 386 wlan_scan_setup_scan_config(wlan_private * priv,
 387                             const struct wlan_ioctl_user_scan_cfg * puserscanin,
 388                             struct mrvlietypes_chanlistparamset ** ppchantlvout,
 389                             struct chanscanparamset * pscanchanlist,
 390                             int *pmaxchanperscan,
 391                             u8 * pfilteredscan,
 392                             u8 * pscancurrentonly)
 393 {
 394         wlan_adapter *adapter = priv->adapter;
 395         struct mrvlietypes_numprobes *pnumprobestlv;
 396         struct mrvlietypes_ssidparamset *pssidtlv;
 397         struct wlan_scan_cmd_config * pscancfgout = NULL;
 398         u8 *ptlvpos;
 399         u16 numprobes;
 400         int chanidx;
 401         int scantype;
 402         int scandur;
 403         int channel;
 404         int radiotype;
 405
 406         pscancfgout = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
 407         if (pscancfgout == NULL)
 408                 goto out;
 409
 410         /* The tlvbufferlen is calculated for each scan command.  The TLVs added
 411          *   in this routine will be preserved since the routine that sends
 412          *   the command will append channelTLVs at *ppchantlvout.  The difference
 413          *   between the *ppchantlvout and the tlvbuffer start will be used
 414          *   to calculate the size of anything we add in this routine.
 415          */
 416         pscancfgout->tlvbufferlen = 0;
 417
 418         /* Running tlv pointer.  Assigned to ppchantlvout at end of function
 419          *  so later routines know where channels can be added to the command buf
 420          */
 421         ptlvpos = pscancfgout->tlvbuffer;
 422
 423         /*
 424          * Set the initial scan paramters for progressive scanning.  If a specific
 425          *   BSSID or SSID is used, the number of channels in the scan command
 426          *   will be increased to the absolute maximum
 427          */
 428         *pmaxchanperscan = MRVDRV_CHANNELS_PER_SCAN_CMD;
 429
 430         /* Initialize the scan as un-filtered by firmware, set to TRUE below if
 431          *   a SSID or BSSID filter is sent in the command
 432          */
 433         *pfilteredscan = 0;
 434
 435         /* Initialize the scan as not being only on the current channel.  If
 436          *   the channel list is customized, only contains one channel, and
 437          *   is the active channel, this is set true and data flow is not halted.
 438          */
 439         *pscancurrentonly = 0;
 440
 441         if (puserscanin) {
 442
 443                 /* Set the bss type scan filter, use adapter setting if unset */
 444                 pscancfgout->bsstype =
 445                     (puserscanin->bsstype ? puserscanin->bsstype : adapter->
 446                      scanmode);
 447
 448                 /* Set the number of probes to send, use adapter setting if unset */
 449                 numprobes = (puserscanin->numprobes ? puserscanin->numprobes :
 450                              adapter->scanprobes);
 451
 452                 /*
 453                  * Set the BSSID filter to the incoming configuration,
 454                  *   if non-zero.  If not set, it will remain disabled (all zeros).
 455                  */
 456                 memcpy(pscancfgout->bssid, puserscanin->bssid,
 457                        sizeof(pscancfgout->bssid));
 458
 459                 if (puserscanin->ssid_len) {
 460                         pssidtlv =
 461                             (struct mrvlietypes_ssidparamset *) pscancfgout->
 462                             tlvbuffer;
 463                         pssidtlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
 464                         pssidtlv->header.len = cpu_to_le16(puserscanin->ssid_len);
 465                         memcpy(pssidtlv->ssid, puserscanin->ssid,
 466                                puserscanin->ssid_len);
 467                         ptlvpos += sizeof(pssidtlv->header) + puserscanin->ssid_len;
 468                 }
 469
 470                 /*
 471                  *  The default number of channels sent in the command is low to
 472                  *    ensure the response buffer from the firmware does not truncate
 473                  *    scan results.  That is not an issue with an SSID or BSSID
 474                  *    filter applied to the scan results in the firmware.
 475                  */
 476                 if (   puserscanin->ssid_len
 477                     || (compare_ether_addr(pscancfgout->bssid, &zeromac[0]) != 0)) {
 478                         *pmaxchanperscan = MRVDRV_MAX_CHANNELS_PER_SCAN;
 479                         *pfilteredscan = 1;
 480                 }
 481         } else {
 482                 pscancfgout->bsstype = adapter->scanmode;
 483                 numprobes = adapter->scanprobes;
 484         }
 485
 486         /* If the input config or adapter has the number of Probes set, add tlv */
 487         if (numprobes) {
 488                 pnumprobestlv = (struct mrvlietypes_numprobes *) ptlvpos;
 489                 pnumprobestlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 490                 pnumprobestlv->header.len = cpu_to_le16(2);
 491                 pnumprobestlv->numprobes = cpu_to_le16(numprobes);
 492
 493                 ptlvpos += sizeof(*pnumprobestlv);
 494         }
 495
 496         /*
 497          * Set the output for the channel TLV to the address in the tlv buffer
 498          *   past any TLVs that were added in this fuction (SSID, numprobes).
 499          *   channel TLVs will be added past this for each scan command, preserving
 500          *   the TLVs that were previously added.
 501          */
 502         *ppchantlvout = (struct mrvlietypes_chanlistparamset *) ptlvpos;
 503
 504         if (puserscanin && puserscanin->chanlist[0].channumber) {
 505
 506                 lbs_deb_scan("Scan: Using supplied channel list\n");
 507
 508                 for (chanidx = 0;
 509                      chanidx < WLAN_IOCTL_USER_SCAN_CHAN_MAX
 510                      && puserscanin->chanlist[chanidx].channumber; chanidx++) {
 511
 512                         channel = puserscanin->chanlist[chanidx].channumber;
 513                         (pscanchanlist + chanidx)->channumber = channel;
 514
 515                         radiotype = puserscanin->chanlist[chanidx].radiotype;
 516                         (pscanchanlist + chanidx)->radiotype = radiotype;
 517
 518                         scantype = puserscanin->chanlist[chanidx].scantype;
 519
 520                         if (scantype == cmd_scan_type_passive) {
 521                                 (pscanchanlist +
 522                                  chanidx)->chanscanmode.passivescan = 1;
 523                         } else {
 524                                 (pscanchanlist +
 525                                  chanidx)->chanscanmode.passivescan = 0;
 526                         }
 527
 528                         if (puserscanin->chanlist[chanidx].scantime) {
 529                                 scandur =
 530                                     puserscanin->chanlist[chanidx].scantime;
 531                         } else {
 532                                 if (scantype == cmd_scan_type_passive) {
 533                                         scandur = MRVDRV_PASSIVE_SCAN_CHAN_TIME;
 534                                 } else {
 535                                         scandur = MRVDRV_ACTIVE_SCAN_CHAN_TIME;
 536                                 }
 537                         }
 538
 539                         (pscanchanlist + chanidx)->minscantime =
 540                             cpu_to_le16(scandur);
 541                         (pscanchanlist + chanidx)->maxscantime =
 542                             cpu_to_le16(scandur);
 543                 }
 544
 545                 /* Check if we are only scanning the current channel */
 546                 if ((chanidx == 1) && (puserscanin->chanlist[0].channumber
 547                                        ==
 548                                        priv->adapter->curbssparams.channel)) {
 549                         *pscancurrentonly = 1;
 550                         lbs_deb_scan("Scan: Scanning current channel only");
 551                 }
 552
 553         } else {
 554                 lbs_deb_scan("Scan: Creating full region channel list\n");
 555                 wlan_scan_create_channel_list(priv, pscanchanlist,
 556                                               *pfilteredscan);
 557         }
 558
 559 out:
 560         return pscancfgout;
 561 }
 562
 563 /**
 564  *  @brief Construct and send multiple scan config commands to the firmware
 565  *
 566  *  Previous routines have created a wlan_scan_cmd_config with any requested
 567  *   TLVs.  This function splits the channel TLV into maxchanperscan lists
 568  *   and sends the portion of the channel TLV along with the other TLVs
 569  *   to the wlan_cmd routines for execution in the firmware.
 570  *
 571  *  @param priv            A pointer to wlan_private structure
 572  *  @param maxchanperscan  Maximum number channels to be included in each
 573  *                         scan command sent to firmware
 574  *  @param filteredscan    Flag indicating whether or not a BSSID or SSID
 575  *                         filter is being used for the firmware command
 576  *                         scan command sent to firmware
 577  *  @param pscancfgout     Scan configuration used for this scan.
 578  *  @param pchantlvout     Pointer in the pscancfgout where the channel TLV
 579  *                         should start.  This is past any other TLVs that
 580  *                         must be sent down in each firmware command.
 581  *  @param pscanchanlist   List of channels to scan in maxchanperscan segments
 582  *
 583  *  @return                0 or error return otherwise
 584  */
 585 static int wlan_scan_channel_list(wlan_private * priv,
 586                                   int maxchanperscan,
 587                                   u8 filteredscan,
 588                                   struct wlan_scan_cmd_config * pscancfgout,
 589                                   struct mrvlietypes_chanlistparamset * pchantlvout,
 590                                   struct chanscanparamset * pscanchanlist,
 591                                   const struct wlan_ioctl_user_scan_cfg * puserscanin,
 592                                   int full_scan)
 593 {
 594         struct chanscanparamset *ptmpchan;
 595         struct chanscanparamset *pstartchan;
 596         u8 scanband;
 597         int doneearly;
 598         int tlvidx;
 599         int ret = 0;
 600         int scanned = 0;
 601         union iwreq_data wrqu;
 602
 603         lbs_deb_enter(LBS_DEB_ASSOC);
 604
 605         if (pscancfgout == 0 || pchantlvout == 0 || pscanchanlist == 0) {
 606                 lbs_deb_scan("Scan: Null detect: %p, %p, %p\n",
 607                        pscancfgout, pchantlvout, pscanchanlist);
 608                 return -1;
 609         }
 610
 611         pchantlvout->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 612
 613         /* Set the temp channel struct pointer to the start of the desired list */
 614         ptmpchan = pscanchanlist;
 615
 616         if (priv->adapter->last_scanned_channel && !puserscanin)
 617                 ptmpchan += priv->adapter->last_scanned_channel;
 618
 619         /* Loop through the desired channel list, sending a new firmware scan
 620          *   commands for each maxchanperscan channels (or for 1,6,11 individually
 621          *   if configured accordingly)
 622          */
 623         while (ptmpchan->channumber) {
 624
 625                 tlvidx = 0;
 626                 pchantlvout->header.len = 0;
 627                 scanband = ptmpchan->radiotype;
 628                 pstartchan = ptmpchan;
 629                 doneearly = 0;
 630
 631                 /* Construct the channel TLV for the scan command.  Continue to
 632                  *  insert channel TLVs until:
 633                  *    - the tlvidx hits the maximum configured per scan command
 634                  *    - the next channel to insert is 0 (end of desired channel list)
 635                  *    - doneearly is set (controlling individual scanning of 1,6,11)
 636                  */
 637                 while (tlvidx < maxchanperscan && ptmpchan->channumber
 638                        && !doneearly && scanned < 2) {
 639
 640             lbs_deb_scan(
 641                     "Scan: Chan(%3d), Radio(%d), mode(%d,%d), Dur(%d)\n",
 642                 ptmpchan->channumber, ptmpchan->radiotype,
 643                 ptmpchan->chanscanmode.passivescan,
 644                 ptmpchan->chanscanmode.disablechanfilt,
 645                 ptmpchan->maxscantime);
 646
 647                         /* Copy the current channel TLV to the command being prepared */
 648                         memcpy(pchantlvout->chanscanparam + tlvidx,
 649                                ptmpchan, sizeof(pchantlvout->chanscanparam));
 650
 651                         /* Increment the TLV header length by the size appended */
 652                         /* Ew, it would be _so_ nice if we could just declare the
 653                            variable little-endian and let GCC handle it for us */
 654                         pchantlvout->header.len =
 655                                 cpu_to_le16(le16_to_cpu(pchantlvout->header.len) +
 656                                             sizeof(pchantlvout->chanscanparam));
 657
 658                         /*
 659                          *  The tlv buffer length is set to the number of bytes of the
 660                          *    between the channel tlv pointer and the start of the
 661                          *    tlv buffer.  This compensates for any TLVs that were appended
 662                          *    before the channel list.
 663                          */
 664                         pscancfgout->tlvbufferlen = ((u8 *) pchantlvout
 665                                                      - pscancfgout->tlvbuffer);
 666
 667                         /*  Add the size of the channel tlv header and the data length */
 668                         pscancfgout->tlvbufferlen +=
 669                             (sizeof(pchantlvout->header)
 670                              + le16_to_cpu(pchantlvout->header.len));
 671
 672                         /* Increment the index to the channel tlv we are constructing */
 673                         tlvidx++;
 674
 675                         doneearly = 0;
 676
 677                         /* Stop the loop if the *current* channel is in the 1,6,11 set
 678                          *   and we are not filtering on a BSSID or SSID.
 679                          */
 680                         if (!filteredscan && (ptmpchan->channumber == 1
 681                                               || ptmpchan->channumber == 6
 682                                               || ptmpchan->channumber == 11)) {
 683                                 doneearly = 1;
 684                         }
 685
 686                         /* Increment the tmp pointer to the next channel to be scanned */
 687                         ptmpchan++;
 688                         scanned++;
 689
 690                         /* Stop the loop if the *next* channel is in the 1,6,11 set.
 691                          *  This will cause it to be the only channel scanned on the next
 692                          *  interation
 693                          */
 694                         if (!filteredscan && (ptmpchan->channumber == 1
 695                                               || ptmpchan->channumber == 6
 696                                               || ptmpchan->channumber == 11)) {
 697                                 doneearly = 1;
 698                         }
 699                 }
 700
 701                 /* Send the scan command to the firmware with the specified cfg */
 702                 ret = libertas_prepare_and_send_command(priv, cmd_802_11_scan, 0,
 703                                             0, 0, pscancfgout);
 704                 if (scanned >= 2 && !full_scan) {
 705                         ret = 0;
 706                         goto done;
 707                 }
 708                 scanned = 0;
 709         }
 710
 711 done:
 712         priv->adapter->last_scanned_channel = ptmpchan->channumber;
 713
 714         /* Tell userspace the scan table has been updated */
 715         memset(&wrqu, 0, sizeof(union iwreq_data));
 716         wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
 717
 718         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 719         return ret;
 720 }
 721
 722 static void
 723 clear_selected_scan_list_entries(wlan_adapter * adapter,
 724                                  const struct wlan_ioctl_user_scan_cfg * scan_cfg)
 725 {
 726         struct bss_descriptor * bss;
 727         struct bss_descriptor * safe;
 728         u32 clear_ssid_flag = 0, clear_bssid_flag = 0;
 729
 730         if (!scan_cfg)
 731                 return;
 732
 733         if (scan_cfg->clear_ssid && scan_cfg->ssid_len)
 734                 clear_ssid_flag = 1;
 735
 736         if (scan_cfg->clear_bssid
 737             && (compare_ether_addr(scan_cfg->bssid, &zeromac[0]) != 0)
 738             && (compare_ether_addr(scan_cfg->bssid, &bcastmac[0]) != 0)) {
 739                 clear_bssid_flag = 1;
 740         }
 741
 742         if (!clear_ssid_flag && !clear_bssid_flag)
 743                 return;
 744
 745         mutex_lock(&adapter->lock);
 746         list_for_each_entry_safe (bss, safe, &adapter->network_list, list) {
 747                 u32 clear = 0;
 748
 749                 /* Check for an SSID match */
 750                 if (   clear_ssid_flag
 751                     && (bss->ssid_len == scan_cfg->ssid_len)
 752                     && !memcmp(bss->ssid, scan_cfg->ssid, bss->ssid_len))
 753                         clear = 1;
 754
 755                 /* Check for a BSSID match */
 756                 if (   clear_bssid_flag
 757                     && !compare_ether_addr(bss->bssid, scan_cfg->bssid))
 758                         clear = 1;
 759
 760                 if (clear) {
 761                         list_move_tail (&bss->list, &adapter->network_free_list);
 762                         clear_bss_descriptor(bss);
 763                 }
 764         }
 765         mutex_unlock(&adapter->lock);
 766 }
 767
 768
 769 /**
 770  *  @brief Internal function used to start a scan based on an input config
 771  *
 772  *  Use the input user scan configuration information when provided in
 773  *    order to send the appropriate scan commands to firmware to populate or
 774  *    update the internal driver scan table
 775  *
 776  *  @param priv          A pointer to wlan_private structure
 777  *  @param puserscanin   Pointer to the input configuration for the requested
 778  *                       scan.
 779  *
 780  *  @return              0 or < 0 if error
 781  */
 782 int wlan_scan_networks(wlan_private * priv,
 783                               const struct wlan_ioctl_user_scan_cfg * puserscanin,
 784                               int full_scan)
 785 {
 786         wlan_adapter * adapter = priv->adapter;
 787         struct mrvlietypes_chanlistparamset *pchantlvout;
 788         struct chanscanparamset * scan_chan_list = NULL;
 789         struct wlan_scan_cmd_config * scan_cfg = NULL;
 790         u8 filteredscan;
 791         u8 scancurrentchanonly;
 792         int maxchanperscan;
 793         int ret;
 794
 795         lbs_deb_enter(LBS_DEB_ASSOC);
 796
 797         scan_chan_list = kzalloc(sizeof(struct chanscanparamset) *
 798                                 WLAN_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
 799         if (scan_chan_list == NULL) {
 800                 ret = -ENOMEM;
 801                 goto out;
 802         }
 803
 804         scan_cfg = wlan_scan_setup_scan_config(priv,
 805                                                puserscanin,
 806                                                &pchantlvout,
 807                                                scan_chan_list,
 808                                                &maxchanperscan,
 809                                                &filteredscan,
 810                                                &scancurrentchanonly);
 811         if (scan_cfg == NULL) {
 812                 ret = -ENOMEM;
 813                 goto out;
 814         }
 815
 816         clear_selected_scan_list_entries(adapter, puserscanin);
 817
 818         /* Keep the data path active if we are only scanning our current channel */
 819         if (!scancurrentchanonly) {
 820                 netif_stop_queue(priv->dev);
 821                 netif_carrier_off(priv->dev);
 822                 netif_stop_queue(priv->mesh_dev);
 823                 netif_carrier_off(priv->mesh_dev);
 824         }
 825
 826         ret = wlan_scan_channel_list(priv,
 827                                      maxchanperscan,
 828                                      filteredscan,
 829                                      scan_cfg,
 830                                      pchantlvout,
 831                                      scan_chan_list,
 832                                      puserscanin,
 833                                      full_scan);
 834
 835         /*  Process the resulting scan table:
 836          *    - Remove any bad ssids
 837          *    - Update our current BSS information from scan data
 838          */
 839         wlan_scan_process_results(priv);
 840
 841         if (priv->adapter->connect_status == libertas_connected) {
 842                 netif_carrier_on(priv->dev);
 843                 netif_wake_queue(priv->dev);
 844                 netif_carrier_on(priv->mesh_dev);
 845                 netif_wake_queue(priv->mesh_dev);
 846         }
 847
 848 out:
 849         if (scan_cfg)
 850                 kfree(scan_cfg);
 851
 852         if (scan_chan_list)
 853                 kfree(scan_chan_list);
 854
 855         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 856         return ret;
 857 }
 858
 859 /**
 860  *  @brief Inspect the scan response buffer for pointers to expected TLVs
 861  *
 862  *  TLVs can be included at the end of the scan response BSS information.
 863  *    Parse the data in the buffer for pointers to TLVs that can potentially
 864  *    be passed back in the response
 865  *
 866  *  @param ptlv        Pointer to the start of the TLV buffer to parse
 867  *  @param tlvbufsize  size of the TLV buffer
 868  *  @param ptsftlv     Output parameter: Pointer to the TSF TLV if found
 869  *
 870  *  @return            void
 871  */
 872 static
 873 void wlan_ret_802_11_scan_get_tlv_ptrs(struct mrvlietypes_data * ptlv,
 874                                        int tlvbufsize,
 875                                        struct mrvlietypes_tsftimestamp ** ptsftlv)
 876 {
 877         struct mrvlietypes_data *pcurrenttlv;
 878         int tlvbufleft;
 879         u16 tlvtype;
 880         u16 tlvlen;
 881
 882         pcurrenttlv = ptlv;
 883         tlvbufleft = tlvbufsize;
 884         *ptsftlv = NULL;
 885
 886         lbs_deb_scan("SCAN_RESP: tlvbufsize = %d\n", tlvbufsize);
 887         lbs_dbg_hex("SCAN_RESP: TLV Buf", (u8 *) ptlv, tlvbufsize);
 888
 889         while (tlvbufleft >= sizeof(struct mrvlietypesheader)) {
 890                 tlvtype = le16_to_cpu(pcurrenttlv->header.type);
 891                 tlvlen = le16_to_cpu(pcurrenttlv->header.len);
 892
 893                 switch (tlvtype) {
 894                 case TLV_TYPE_TSFTIMESTAMP:
 895                         *ptsftlv = (struct mrvlietypes_tsftimestamp *) pcurrenttlv;
 896                         break;
 897
 898                 default:
 899                         lbs_deb_scan("SCAN_RESP: Unhandled TLV = %d\n",
 900                                tlvtype);
 901                         /* Give up, this seems corrupted */
 902                         return;
 903                 }               /* switch */
 904
 905                 tlvbufleft -= (sizeof(ptlv->header) + tlvlen);
 906                 pcurrenttlv =
 907                     (struct mrvlietypes_data *) (pcurrenttlv->Data + tlvlen);
 908         }                       /* while */
 909 }
 910
 911 /**
 912  *  @brief Interpret a BSS scan response returned from the firmware
 913  *
 914  *  Parse the various fixed fields and IEs passed back for a a BSS probe
 915  *   response or beacon from the scan command.  Record information as needed
 916  *   in the scan table struct bss_descriptor for that entry.
 917  *
 918  *  @param bss  Output parameter: Pointer to the BSS Entry
 919  *
 920  *  @return             0 or -1
 921  */
 922 static int libertas_process_bss(struct bss_descriptor * bss,
 923                                 u8 ** pbeaconinfo, int *bytesleft)
 924 {
 925         enum ieeetypes_elementid elemID;
 926         struct ieeetypes_fhparamset *pFH;
 927         struct ieeetypes_dsparamset *pDS;
 928         struct ieeetypes_cfparamset *pCF;
 929         struct ieeetypes_ibssparamset *pibss;
 930         struct ieeetypes_capinfo *pcap;
 931         struct WLAN_802_11_FIXED_IEs fixedie;
 932         u8 *pcurrentptr;
 933         u8 *pRate;
 934         u8 elemlen;
 935         u8 bytestocopy;
 936         u8 ratesize;
 937         u16 beaconsize;
 938         u8 founddatarateie;
 939         int bytesleftforcurrentbeacon;
 940         int ret;
 941
 942         struct IE_WPA *pIe;
 943         const u8 oui01[4] = { 0x00, 0x50, 0xf2, 0x01 };
 944
 945         struct ieeetypes_countryinfoset *pcountryinfo;
 946
 947         lbs_deb_enter(LBS_DEB_ASSOC);
 948
 949         founddatarateie = 0;
 950         ratesize = 0;
 951         beaconsize = 0;
 952
 953         if (*bytesleft >= sizeof(beaconsize)) {
 954                 /* Extract & convert beacon size from the command buffer */
 955                 beaconsize = le16_to_cpup((void *)*pbeaconinfo);
 956                 *bytesleft -= sizeof(beaconsize);
 957                 *pbeaconinfo += sizeof(beaconsize);
 958         }
 959
 960         if (beaconsize == 0 || beaconsize > *bytesleft) {
 961
 962                 *pbeaconinfo += *bytesleft;
 963                 *bytesleft = 0;
 964
 965                 return -1;
 966         }
 967
 968         /* Initialize the current working beacon pointer for this BSS iteration */
 969         pcurrentptr = *pbeaconinfo;
 970
 971         /* Advance the return beacon pointer past the current beacon */
 972         *pbeaconinfo += beaconsize;
 973         *bytesleft -= beaconsize;
 974
 975         bytesleftforcurrentbeacon = beaconsize;
 976
 977         memcpy(bss->bssid, pcurrentptr, ETH_ALEN);
 978         lbs_deb_scan("process_bss: AP BSSID " MAC_FMT "\n", MAC_ARG(bss->bssid));
 979
 980         pcurrentptr += ETH_ALEN;
 981         bytesleftforcurrentbeacon -= ETH_ALEN;
 982
 983         if (bytesleftforcurrentbeacon < 12) {
 984                 lbs_deb_scan("process_bss: Not enough bytes left\n");
 985                 return -1;
 986         }
 987
 988         /*
 989          * next 4 fields are RSSI, time stamp, beacon interval,
 990          *   and capability information
 991          */
 992
 993         /* RSSI is 1 byte long */
 994         bss->rssi = *pcurrentptr;
 995         lbs_deb_scan("process_bss: RSSI=%02X\n", *pcurrentptr);
 996         pcurrentptr += 1;
 997         bytesleftforcurrentbeacon -= 1;
 998
 999         /* time stamp is 8 bytes long */
1000         fixedie.timestamp = bss->timestamp = le64_to_cpup((void *)pcurrentptr);
1001         pcurrentptr += 8;
1002         bytesleftforcurrentbeacon -= 8;
1003
1004         /* beacon interval is 2 bytes long */
1005         fixedie.beaconinterval = bss->beaconperiod = le16_to_cpup((void *)pcurrentptr);
1006         pcurrentptr += 2;
1007         bytesleftforcurrentbeacon -= 2;
1008
1009         /* capability information is 2 bytes long */
1010         memcpy(&fixedie.capabilities, pcurrentptr, 2);
1011         lbs_deb_scan("process_bss: fixedie.capabilities=0x%X\n",
1012                fixedie.capabilities);
1013         pcap = (struct ieeetypes_capinfo *) & fixedie.capabilities;
1014         memcpy(&bss->cap, pcap, sizeof(struct ieeetypes_capinfo));
1015         pcurrentptr += 2;
1016         bytesleftforcurrentbeacon -= 2;
1017
1018         /* rest of the current buffer are IE's */
1019         lbs_deb_scan("process_bss: IE length for this AP = %d\n",
1020                bytesleftforcurrentbeacon);
1021
1022         lbs_dbg_hex("process_bss: IE info", (u8 *) pcurrentptr,
1023                 bytesleftforcurrentbeacon);
1024
1025         if (pcap->privacy) {
1026                 lbs_deb_scan("process_bss: AP WEP enabled\n");
1027                 bss->privacy = wlan802_11privfilter8021xWEP;
1028         } else {
1029                 bss->privacy = wlan802_11privfilteracceptall;
1030         }
1031
1032         if (pcap->ibss == 1) {
1033                 bss->mode = IW_MODE_ADHOC;
1034         } else {
1035                 bss->mode = IW_MODE_INFRA;
1036         }
1037
1038         /* process variable IE */
1039         while (bytesleftforcurrentbeacon >= 2) {
1040                 elemID = (enum ieeetypes_elementid) (*((u8 *) pcurrentptr));
1041                 elemlen = *((u8 *) pcurrentptr + 1);
1042
1043                 if (bytesleftforcurrentbeacon < elemlen) {
1044                         lbs_deb_scan("process_bss: error in processing IE, "
1045                                "bytes left < IE length\n");
1046                         bytesleftforcurrentbeacon = 0;
1047                         continue;
1048                 }
1049
1050                 switch (elemID) {
1051                 case SSID:
1052                         bss->ssid_len = elemlen;
1053                         memcpy(bss->ssid, (pcurrentptr + 2), elemlen);
1054                         lbs_deb_scan("ssid '%s', ssid length %u\n",
1055                                      escape_essid(bss->ssid, bss->ssid_len),
1056                                      bss->ssid_len);
1057                         break;
1058
1059                 case SUPPORTED_RATES:
1060                         memcpy(bss->datarates, (pcurrentptr + 2), elemlen);
1061                         memmove(bss->libertas_supported_rates, (pcurrentptr + 2),
1062                                 elemlen);
1063                         ratesize = elemlen;
1064                         founddatarateie = 1;
1065                         break;
1066
1067                 case EXTRA_IE:
1068                         lbs_deb_scan("process_bss: EXTRA_IE Found!\n");
1069                         break;
1070
1071                 case FH_PARAM_SET:
1072                         pFH = (struct ieeetypes_fhparamset *) pcurrentptr;
1073                         memmove(&bss->phyparamset.fhparamset, pFH,
1074                                 sizeof(struct ieeetypes_fhparamset));
1075 #if 0 /* I think we can store these LE */
1076                         bss->phyparamset.fhparamset.dwelltime
1077                             = le16_to_cpu(bss->phyparamset.fhparamset.dwelltime);
1078 #endif
1079                         break;
1080
1081                 case DS_PARAM_SET:
1082                         pDS = (struct ieeetypes_dsparamset *) pcurrentptr;
1083                         bss->channel = pDS->currentchan;
1084                         memcpy(&bss->phyparamset.dsparamset, pDS,
1085                                sizeof(struct ieeetypes_dsparamset));
1086                         break;
1087
1088                 case CF_PARAM_SET:
1089                         pCF = (struct ieeetypes_cfparamset *) pcurrentptr;
1090                         memcpy(&bss->ssparamset.cfparamset, pCF,
1091                                sizeof(struct ieeetypes_cfparamset));
1092                         break;
1093
1094                 case IBSS_PARAM_SET:
1095                         pibss = (struct ieeetypes_ibssparamset *) pcurrentptr;
1096                         bss->atimwindow = le32_to_cpu(pibss->atimwindow);
1097                         memmove(&bss->ssparamset.ibssparamset, pibss,
1098                                 sizeof(struct ieeetypes_ibssparamset));
1099 #if 0
1100                         bss->ssparamset.ibssparamset.atimwindow
1101                             = le16_to_cpu(bss->ssparamset.ibssparamset.atimwindow);
1102 #endif
1103                         break;
1104
1105                         /* Handle Country Info IE */
1106                 case COUNTRY_INFO:
1107                         pcountryinfo = (struct ieeetypes_countryinfoset *) pcurrentptr;
1108                         if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
1109                             || pcountryinfo->len > 254) {
1110                                 lbs_deb_scan("process_bss: 11D- Err "
1111                                        "CountryInfo len =%d min=%zd max=254\n",
1112                                        pcountryinfo->len,
1113                                        sizeof(pcountryinfo->countrycode));
1114                                 ret = -1;
1115                                 goto done;
1116                         }
1117
1118                         memcpy(&bss->countryinfo,
1119                                pcountryinfo, pcountryinfo->len + 2);
1120                         lbs_dbg_hex("process_bss: 11D- CountryInfo:",
1121                                 (u8 *) pcountryinfo,
1122                                 (u32) (pcountryinfo->len + 2));
1123                         break;
1124
1125                 case EXTENDED_SUPPORTED_RATES:
1126                         /*
1127                          * only process extended supported rate
1128                          * if data rate is already found.
1129                          * data rate IE should come before
1130                          * extended supported rate IE
1131                          */
1132                         if (founddatarateie) {
1133                                 if ((elemlen + ratesize) > WLAN_SUPPORTED_RATES) {
1134                                         bytestocopy =
1135                                             (WLAN_SUPPORTED_RATES - ratesize);
1136                                 } else {
1137                                         bytestocopy = elemlen;
1138                                 }
1139
1140                                 pRate = (u8 *) bss->datarates;
1141                                 pRate += ratesize;
1142                                 memmove(pRate, (pcurrentptr + 2), bytestocopy);
1143                                 pRate = (u8 *) bss->libertas_supported_rates;
1144                                 pRate += ratesize;
1145                                 memmove(pRate, (pcurrentptr + 2), bytestocopy);
1146                         }
1147                         break;
1148
1149                 case VENDOR_SPECIFIC_221:
1150 #define IE_ID_LEN_FIELDS_BYTES 2
1151                         pIe = (struct IE_WPA *)pcurrentptr;
1152
1153                         if (memcmp(pIe->oui, oui01, sizeof(oui01)))
1154                                 break;
1155
1156                         bss->wpa_ie_len = min(elemlen + IE_ID_LEN_FIELDS_BYTES,
1157                                 MAX_WPA_IE_LEN);
1158                         memcpy(bss->wpa_ie, pcurrentptr, bss->wpa_ie_len);
1159                         lbs_dbg_hex("process_bss: WPA IE", bss->wpa_ie, elemlen);
1160                         break;
1161                 case WPA2_IE:
1162                         pIe = (struct IE_WPA *)pcurrentptr;
1163                         bss->rsn_ie_len = min(elemlen + IE_ID_LEN_FIELDS_BYTES,
1164                                 MAX_WPA_IE_LEN);
1165                         memcpy(bss->rsn_ie, pcurrentptr, bss->rsn_ie_len);
1166                         lbs_dbg_hex("process_bss: RSN_IE", bss->rsn_ie, elemlen);
1167                         break;
1168                 case TIM:
1169                         break;
1170
1171                 case CHALLENGE_TEXT:
1172                         break;
1173                 }
1174
1175                 pcurrentptr += elemlen + 2;
1176
1177                 /* need to account for IE ID and IE len */
1178                 bytesleftforcurrentbeacon -= (elemlen + 2);
1179
1180         }                       /* while (bytesleftforcurrentbeacon > 2) */
1181
1182         /* Timestamp */
1183         bss->last_scanned = jiffies;
1184
1185         ret = 0;
1186
1187 done:
1188         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1189         return ret;
1190 }
1191
1192 /**
1193  *  @brief Compare two SSIDs
1194  *
1195  *  @param ssid1    A pointer to ssid to compare
1196  *  @param ssid2    A pointer to ssid to compare
1197  *
1198  *  @return         0--ssid is same, otherwise is different
1199  */
1200 int libertas_ssid_cmp(u8 *ssid1, u8 ssid1_len, u8 *ssid2, u8 ssid2_len)
1201 {
1202         if (ssid1_len != ssid2_len)
1203                 return -1;
1204
1205         return memcmp(ssid1, ssid2, ssid1_len);
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                    u8 *ssid, u8 ssid_len, 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, iter_bss->ssid_len,
1281                                       ssid, ssid_len) != 0)
1282                         continue; /* ssid doesn't match */
1283                 if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
1284                         continue; /* bssid doesn't match */
1285                 if ((channel > 0) && (iter_bss->channel != channel))
1286                         continue; /* channel doesn't match */
1287
1288                 switch (mode) {
1289                 case IW_MODE_INFRA:
1290                 case IW_MODE_ADHOC:
1291                         if (!is_network_compatible(adapter, iter_bss, mode))
1292                                 break;
1293
1294                         if (bssid) {
1295                                 /* Found requested BSSID */
1296                                 found_bss = iter_bss;
1297                                 goto out;
1298                         }
1299
1300                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1301                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1302                                 found_bss = iter_bss;
1303                         }
1304                         break;
1305                 case IW_MODE_AUTO:
1306                 default:
1307                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1308                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1309                                 found_bss = iter_bss;
1310                         }
1311                         break;
1312                 }
1313         }
1314
1315 out:
1316         mutex_unlock(&adapter->lock);
1317         return found_bss;
1318 }
1319
1320 /**
1321  *  @brief This function finds the best SSID in the Scan List
1322  *
1323  *  Search the scan table for the best SSID that also matches the current
1324  *   adapter network preference (infrastructure or adhoc)
1325  *
1326  *  @param adapter  A pointer to wlan_adapter
1327  *
1328  *  @return         index in BSSID list
1329  */
1330 struct bss_descriptor * libertas_find_best_ssid_in_list(wlan_adapter * adapter,
1331                 u8 mode)
1332 {
1333         u8 bestrssi = 0;
1334         struct bss_descriptor * iter_bss;
1335         struct bss_descriptor * best_bss = NULL;
1336
1337         mutex_lock(&adapter->lock);
1338
1339         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1340                 switch (mode) {
1341                 case IW_MODE_INFRA:
1342                 case IW_MODE_ADHOC:
1343                         if (!is_network_compatible(adapter, iter_bss, mode))
1344                                 break;
1345                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1346                                 break;
1347                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1348                         best_bss = iter_bss;
1349                         break;
1350                 case IW_MODE_AUTO:
1351                 default:
1352                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1353                                 break;
1354                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1355                         best_bss = iter_bss;
1356                         break;
1357                 }
1358         }
1359
1360         mutex_unlock(&adapter->lock);
1361         return best_bss;
1362 }
1363
1364 /**
1365  *  @brief Find the AP with specific ssid in the scan list
1366  *
1367  *  @param priv         A pointer to wlan_private structure
1368  *  @param pSSID        A pointer to AP's ssid
1369  *
1370  *  @return             0--success, otherwise--fail
1371  */
1372 int libertas_find_best_network_ssid(wlan_private * priv,
1373                 u8 *out_ssid, u8 *out_ssid_len, 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         wlan_scan_networks(priv, NULL, 1);
1382         if (adapter->surpriseremoved)
1383                 return -1;
1384
1385         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1386
1387         found = libertas_find_best_ssid_in_list(adapter, preferred_mode);
1388         if (found && (found->ssid_len > 0)) {
1389                 memcpy(out_ssid, &found->ssid, IW_ESSID_MAX_SIZE);
1390                 *out_ssid_len = found->ssid_len;
1391                 *out_mode = found->mode;
1392                 ret = 0;
1393         }
1394
1395         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1396         return ret;
1397 }
1398
1399 /**
1400  *  @brief Scan Network
1401  *
1402  *  @param dev          A pointer to net_device structure
1403  *  @param info         A pointer to iw_request_info structure
1404  *  @param vwrq         A pointer to iw_param structure
1405  *  @param extra        A pointer to extra data buf
1406  *
1407  *  @return             0 --success, otherwise fail
1408  */
1409 int libertas_set_scan(struct net_device *dev, struct iw_request_info *info,
1410                   struct iw_param *vwrq, char *extra)
1411 {
1412         wlan_private *priv = dev->priv;
1413         wlan_adapter *adapter = priv->adapter;
1414
1415         lbs_deb_enter(LBS_DEB_SCAN);
1416
1417         wlan_scan_networks(priv, NULL, 0);
1418
1419         if (adapter->surpriseremoved)
1420                 return -1;
1421
1422         lbs_deb_leave(LBS_DEB_SCAN);
1423         return 0;
1424 }
1425
1426 /**
1427  *  @brief Send a scan command for all available channels filtered on a spec
1428  *
1429  *  @param priv             A pointer to wlan_private structure
1430  *  @param prequestedssid   A pointer to AP's ssid
1431  *  @param keeppreviousscan Flag used to save/clear scan table before scan
1432  *
1433  *  @return                0-success, otherwise fail
1434  */
1435 int libertas_send_specific_ssid_scan(wlan_private * priv,
1436                         u8 *ssid, u8 ssid_len, u8 clear_ssid)
1437 {
1438         wlan_adapter *adapter = priv->adapter;
1439         struct wlan_ioctl_user_scan_cfg scancfg;
1440         int ret = 0;
1441
1442         lbs_deb_enter(LBS_DEB_ASSOC);
1443
1444         if (!ssid_len)
1445                 goto out;
1446
1447         memset(&scancfg, 0x00, sizeof(scancfg));
1448         memcpy(scancfg.ssid, ssid, ssid_len);
1449         scancfg.ssid_len = ssid_len;
1450         scancfg.clear_ssid = clear_ssid;
1451
1452         wlan_scan_networks(priv, &scancfg, 1);
1453         if (adapter->surpriseremoved)
1454                 return -1;
1455         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1456
1457 out:
1458         lbs_deb_leave(LBS_DEB_ASSOC);
1459         return ret;
1460 }
1461
1462 /**
1463  *  @brief scan an AP with specific BSSID
1464  *
1465  *  @param priv             A pointer to wlan_private structure
1466  *  @param bssid            A pointer to AP's bssid
1467  *  @param keeppreviousscan Flag used to save/clear scan table before scan
1468  *
1469  *  @return          0-success, otherwise fail
1470  */
1471 int libertas_send_specific_bssid_scan(wlan_private * priv, u8 * bssid, u8 clear_bssid)
1472 {
1473         struct wlan_ioctl_user_scan_cfg scancfg;
1474
1475         lbs_deb_enter(LBS_DEB_ASSOC);
1476
1477         if (bssid == NULL)
1478                 goto out;
1479
1480         memset(&scancfg, 0x00, sizeof(scancfg));
1481         memcpy(scancfg.bssid, bssid, ETH_ALEN);
1482         scancfg.clear_bssid = clear_bssid;
1483
1484         wlan_scan_networks(priv, &scancfg, 1);
1485         if (priv->adapter->surpriseremoved)
1486                 return -1;
1487         wait_event_interruptible(priv->adapter->cmd_pending,
1488                 !priv->adapter->nr_cmd_pending);
1489
1490 out:
1491         lbs_deb_leave(LBS_DEB_ASSOC);
1492         return 0;
1493 }
1494
1495 static inline char *libertas_translate_scan(wlan_private *priv,
1496                                         char *start, char *stop,
1497                                         struct bss_descriptor *bss)
1498 {
1499         wlan_adapter *adapter = priv->adapter;
1500         struct chan_freq_power *cfp;
1501         char *current_val;      /* For rates */
1502         struct iw_event iwe;    /* Temporary buffer */
1503         int j;
1504 #define PERFECT_RSSI ((u8)50)
1505 #define WORST_RSSI   ((u8)0)
1506 #define RSSI_DIFF    ((u8)(PERFECT_RSSI - WORST_RSSI))
1507         u8 rssi;
1508
1509         cfp = libertas_find_cfp_by_band_and_channel(adapter, 0, bss->channel);
1510         if (!cfp) {
1511                 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1512                 return NULL;
1513         }
1514
1515         /* First entry *MUST* be the AP BSSID */
1516         iwe.cmd = SIOCGIWAP;
1517         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1518         memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1519         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1520
1521         /* SSID */
1522         iwe.cmd = SIOCGIWESSID;
1523         iwe.u.data.flags = 1;
1524         iwe.u.data.length = min((u32) bss->ssid_len, (u32) IW_ESSID_MAX_SIZE);
1525         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1526
1527         /* Mode */
1528         iwe.cmd = SIOCGIWMODE;
1529         iwe.u.mode = bss->mode;
1530         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1531
1532         /* Frequency */
1533         iwe.cmd = SIOCGIWFREQ;
1534         iwe.u.freq.m = (long)cfp->freq * 100000;
1535         iwe.u.freq.e = 1;
1536         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1537
1538         /* Add quality statistics */
1539         iwe.cmd = IWEVQUAL;
1540         iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1541         iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1542
1543         rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1544         iwe.u.qual.qual =
1545             (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1546              (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1547             (RSSI_DIFF * RSSI_DIFF);
1548         if (iwe.u.qual.qual > 100)
1549                 iwe.u.qual.qual = 100;
1550
1551         if (adapter->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1552                 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1553         } else {
1554                 iwe.u.qual.noise =
1555                     CAL_NF(adapter->NF[TYPE_BEACON][TYPE_NOAVG]);
1556         }
1557
1558         /* Locally created ad-hoc BSSs won't have beacons if this is the
1559          * only station in the adhoc network; so get signal strength
1560          * from receive statistics.
1561          */
1562         if ((adapter->mode == IW_MODE_ADHOC)
1563             && adapter->adhoccreate
1564             && !libertas_ssid_cmp(adapter->curbssparams.ssid,
1565                                   adapter->curbssparams.ssid_len,
1566                                   bss->ssid, bss->ssid_len)) {
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);
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,
1602                                   adapter->curbssparams.ssid_len,
1603                                   bss->ssid, bss->ssid_len)
1604             && adapter->adhoccreate) {
1605                 iwe.u.bitrate.value = 22 * 500000;
1606                 current_val = iwe_stream_add_value(start, current_val,
1607                                          stop, &iwe, IW_EV_PARAM_LEN);
1608         }
1609         /* Check if we added any event */
1610         if((current_val - start) > IW_EV_LCP_LEN)
1611                 start = current_val;
1612
1613         memset(&iwe, 0, sizeof(iwe));
1614         if (bss->wpa_ie_len) {
1615                 char buf[MAX_WPA_IE_LEN];
1616                 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1617                 iwe.cmd = IWEVGENIE;
1618                 iwe.u.data.length = bss->wpa_ie_len;
1619                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1620         }
1621
1622         memset(&iwe, 0, sizeof(iwe));
1623         if (bss->rsn_ie_len) {
1624                 char buf[MAX_WPA_IE_LEN];
1625                 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1626                 iwe.cmd = IWEVGENIE;
1627                 iwe.u.data.length = bss->rsn_ie_len;
1628                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1629         }
1630
1631         return start;
1632 }
1633
1634 /**
1635  *  @brief  Retrieve the scan table entries via wireless tools IOCTL call
1636  *
1637  *  @param dev          A pointer to net_device structure
1638  *  @param info         A pointer to iw_request_info structure
1639  *  @param dwrq         A pointer to iw_point structure
1640  *  @param extra        A pointer to extra data buf
1641  *
1642  *  @return             0 --success, otherwise fail
1643  */
1644 int libertas_get_scan(struct net_device *dev, struct iw_request_info *info,
1645                   struct iw_point *dwrq, char *extra)
1646 {
1647 #define SCAN_ITEM_SIZE 128
1648         wlan_private *priv = dev->priv;
1649         wlan_adapter *adapter = priv->adapter;
1650         int err = 0;
1651         char *ev = extra;
1652         char *stop = ev + dwrq->length;
1653         struct bss_descriptor * iter_bss;
1654         struct bss_descriptor * safe;
1655
1656         lbs_deb_enter(LBS_DEB_ASSOC);
1657
1658         /* If we've got an uncompleted scan, schedule the next part */
1659         if (!adapter->nr_cmd_pending && adapter->last_scanned_channel)
1660                 wlan_scan_networks(priv, NULL, 0);
1661
1662         /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1663         if ((adapter->mode == IW_MODE_ADHOC) && adapter->adhoccreate) {
1664                 libertas_prepare_and_send_command(priv, cmd_802_11_rssi, 0,
1665                                         cmd_option_waitforrsp, 0, NULL);
1666         }
1667
1668         mutex_lock(&adapter->lock);
1669         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1670                 char * next_ev;
1671                 unsigned long stale_time;
1672
1673                 if (stop - ev < SCAN_ITEM_SIZE) {
1674                         err = -E2BIG;
1675                         break;
1676                 }
1677
1678                 /* Prune old an old scan result */
1679                 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1680                 if (time_after(jiffies, stale_time)) {
1681                         list_move_tail (&iter_bss->list,
1682                                         &adapter->network_free_list);
1683                         clear_bss_descriptor(iter_bss);
1684                         continue;
1685                 }
1686
1687                 /* Translate to WE format this entry */
1688                 next_ev = libertas_translate_scan(priv, ev, stop, iter_bss);
1689                 if (next_ev == NULL)
1690                         continue;
1691                 ev = next_ev;
1692         }
1693         mutex_unlock(&adapter->lock);
1694
1695         dwrq->length = (ev - extra);
1696         dwrq->flags = 0;
1697
1698         lbs_deb_leave(LBS_DEB_ASSOC);
1699         return err;
1700 }
1701
1702 /**
1703  *  @brief Prepare a scan command to be sent to the firmware
1704  *
1705  *  Use the wlan_scan_cmd_config sent to the command processing module in
1706  *   the libertas_prepare_and_send_command to configure a cmd_ds_802_11_scan command
1707  *   struct to send to firmware.
1708  *
1709  *  The fixed fields specifying the BSS type and BSSID filters as well as a
1710  *   variable number/length of TLVs are sent in the command to firmware.
1711  *
1712  *  @param priv       A pointer to wlan_private structure
1713  *  @param cmd        A pointer to cmd_ds_command structure to be sent to
1714  *                    firmware with the cmd_DS_801_11_SCAN structure
1715  *  @param pdata_buf  Void pointer cast of a wlan_scan_cmd_config struct used
1716  *                    to set the fields/TLVs for the command sent to firmware
1717  *
1718  *  @return           0 or -1
1719  *
1720  *  @sa wlan_scan_create_channel_list
1721  */
1722 int libertas_cmd_80211_scan(wlan_private * priv,
1723                          struct cmd_ds_command *cmd, void *pdata_buf)
1724 {
1725         struct cmd_ds_802_11_scan *pscan = &cmd->params.scan;
1726         struct wlan_scan_cmd_config *pscancfg;
1727
1728         lbs_deb_enter(LBS_DEB_ASSOC);
1729
1730         pscancfg = pdata_buf;
1731
1732         /* Set fixed field variables in scan command */
1733         pscan->bsstype = pscancfg->bsstype;
1734         memcpy(pscan->BSSID, pscancfg->bssid, sizeof(pscan->BSSID));
1735         memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen);
1736
1737         cmd->command = cpu_to_le16(cmd_802_11_scan);
1738
1739         /* size is equal to the sizeof(fixed portions) + the TLV len + header */
1740         cmd->size = cpu_to_le16(sizeof(pscan->bsstype)
1741                                      + sizeof(pscan->BSSID)
1742                                      + pscancfg->tlvbufferlen + S_DS_GEN);
1743
1744         lbs_deb_scan("SCAN_CMD: command=%x, size=%x, seqnum=%x\n",
1745                      le16_to_cpu(cmd->command), le16_to_cpu(cmd->size),
1746                      le16_to_cpu(cmd->seqnum));
1747
1748         lbs_deb_leave(LBS_DEB_ASSOC);
1749         return 0;
1750 }
1751
1752 static inline int is_same_network(struct bss_descriptor *src,
1753                                   struct bss_descriptor *dst)
1754 {
1755         /* A network is only a duplicate if the channel, BSSID, and ESSID
1756          * all match.  We treat all <hidden> with the same BSSID and channel
1757          * as one network */
1758         return ((src->ssid_len == dst->ssid_len) &&
1759                 (src->channel == dst->channel) &&
1760                 !compare_ether_addr(src->bssid, dst->bssid) &&
1761                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1762 }
1763
1764 /**
1765  *  @brief This function handles the command response of scan
1766  *
1767  *   The response buffer for the scan command has the following
1768  *      memory layout:
1769  *
1770  *     .-----------------------------------------------------------.
1771  *     |  header (4 * sizeof(u16)):  Standard command response hdr |
1772  *     .-----------------------------------------------------------.
1773  *     |  bufsize (u16) : sizeof the BSS Description data          |
1774  *     .-----------------------------------------------------------.
1775  *     |  NumOfSet (u8) : Number of BSS Descs returned             |
1776  *     .-----------------------------------------------------------.
1777  *     |  BSSDescription data (variable, size given in bufsize)    |
1778  *     .-----------------------------------------------------------.
1779  *     |  TLV data (variable, size calculated using header->size,  |
1780  *     |            bufsize and sizeof the fixed fields above)     |
1781  *     .-----------------------------------------------------------.
1782  *
1783  *  @param priv    A pointer to wlan_private structure
1784  *  @param resp    A pointer to cmd_ds_command
1785  *
1786  *  @return        0 or -1
1787  */
1788 int libertas_ret_80211_scan(wlan_private * priv, struct cmd_ds_command *resp)
1789 {
1790         wlan_adapter *adapter = priv->adapter;
1791         struct cmd_ds_802_11_scan_rsp *pscan;
1792         struct mrvlietypes_data *ptlv;
1793         struct mrvlietypes_tsftimestamp *ptsftlv;
1794         struct bss_descriptor * iter_bss;
1795         struct bss_descriptor * safe;
1796         u8 *pbssinfo;
1797         u16 scanrespsize;
1798         int bytesleft;
1799         int idx;
1800         int tlvbufsize;
1801         int ret;
1802
1803         lbs_deb_enter(LBS_DEB_ASSOC);
1804
1805         /* Prune old entries from scan table */
1806         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1807                 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1808                 if (time_before(jiffies, stale_time))
1809                         continue;
1810                 list_move_tail (&iter_bss->list, &adapter->network_free_list);
1811                 clear_bss_descriptor(iter_bss);
1812         }
1813
1814         pscan = &resp->params.scanresp;
1815
1816         if (pscan->nr_sets > MAX_NETWORK_COUNT) {
1817                 lbs_deb_scan(
1818                        "SCAN_RESP: too many scan results (%d, max %d)!!\n",
1819                        pscan->nr_sets, MAX_NETWORK_COUNT);
1820                 ret = -1;
1821                 goto done;
1822         }
1823
1824         bytesleft = le16_to_cpu(pscan->bssdescriptsize);
1825         lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1826
1827         scanrespsize = le16_to_cpu(resp->size);
1828         lbs_deb_scan("SCAN_RESP: returned %d AP before parsing\n",
1829                pscan->nr_sets);
1830
1831         pbssinfo = pscan->bssdesc_and_tlvbuffer;
1832
1833         /* The size of the TLV buffer is equal to the entire command response
1834          *   size (scanrespsize) minus the fixed fields (sizeof()'s), the
1835          *   BSS Descriptions (bssdescriptsize as bytesLef) and the command
1836          *   response header (S_DS_GEN)
1837          */
1838         tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize)
1839                                      + sizeof(pscan->nr_sets)
1840                                      + S_DS_GEN);
1841
1842         ptlv = (struct mrvlietypes_data *) (pscan->bssdesc_and_tlvbuffer + bytesleft);
1843
1844         /* Search the TLV buffer space in the scan response for any valid TLVs */
1845         wlan_ret_802_11_scan_get_tlv_ptrs(ptlv, tlvbufsize, &ptsftlv);
1846
1847         /*
1848          *  Process each scan response returned (pscan->nr_sets).  Save
1849          *    the information in the newbssentry and then insert into the
1850          *    driver scan table either as an update to an existing entry
1851          *    or as an addition at the end of the table
1852          */
1853         for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) {
1854                 struct bss_descriptor new;
1855                 struct bss_descriptor * found = NULL;
1856                 struct bss_descriptor * oldest = NULL;
1857
1858                 /* Process the data fields and IEs returned for this BSS */
1859                 memset(&new, 0, sizeof (struct bss_descriptor));
1860                 if (libertas_process_bss(&new, &pbssinfo, &bytesleft) != 0) {
1861                         /* error parsing the scan response, skipped */
1862                         lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1863                         continue;
1864                 }
1865
1866                 /* Try to find this bss in the scan table */
1867                 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1868                         if (is_same_network(iter_bss, &new)) {
1869                                 found = iter_bss;
1870                                 break;
1871                         }
1872
1873                         if ((oldest == NULL) ||
1874                             (iter_bss->last_scanned < oldest->last_scanned))
1875                                 oldest = iter_bss;
1876                 }
1877
1878                 if (found) {
1879                         /* found, clear it */
1880                         clear_bss_descriptor(found);
1881                 } else if (!list_empty(&adapter->network_free_list)) {
1882                         /* Pull one from the free list */
1883                         found = list_entry(adapter->network_free_list.next,
1884                                            struct bss_descriptor, list);
1885                         list_move_tail(&found->list, &adapter->network_list);
1886                 } else if (oldest) {
1887                         /* If there are no more slots, expire the oldest */
1888                         found = oldest;
1889                         clear_bss_descriptor(found);
1890                         list_move_tail(&found->list, &adapter->network_list);
1891                 } else {
1892                         continue;
1893                 }
1894
1895                 lbs_deb_scan("SCAN_RESP: BSSID = " MAC_FMT "\n",
1896                        new.bssid[0], new.bssid[1], new.bssid[2],
1897                        new.bssid[3], new.bssid[4], new.bssid[5]);
1898
1899                 /*
1900                  * If the TSF TLV was appended to the scan results, save the
1901                  *   this entries TSF value in the networktsf field.  The
1902                  *   networktsf is the firmware's TSF value at the time the
1903                  *   beacon or probe response was received.
1904                  */
1905                 if (ptsftlv) {
1906                         new.networktsf = le64_to_cpup(&ptsftlv->tsftable[idx]);
1907                 }
1908
1909                 /* Copy the locally created newbssentry to the scan table */
1910                 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1911         }
1912
1913         ret = 0;
1914
1915 done:
1916         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1917         return ret;
1918 }