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 <asm/unaligned.h>
  17
  18 #include "host.h"
  19 #include "decl.h"
  20 #include "dev.h"
  21 #include "scan.h"
  22 #include "join.h"
  23
  24 //! Approximate amount of data needed to pass a scan result back to iwlist
  25 #define MAX_SCAN_CELL_SIZE  (IW_EV_ADDR_LEN             \
  26                              + IW_ESSID_MAX_SIZE        \
  27                              + IW_EV_UINT_LEN           \
  28                              + IW_EV_FREQ_LEN           \
  29                              + IW_EV_QUAL_LEN           \
  30                              + IW_ESSID_MAX_SIZE        \
  31                              + IW_EV_PARAM_LEN          \
  32                              + 40)      /* 40 for WPAIE */
  33
  34 //! Memory needed to store a max sized channel List TLV for a firmware scan
  35 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mrvlietypesheader)    \
  36                             + (MRVDRV_MAX_CHANNELS_PER_SCAN     \
  37                                * sizeof(struct chanscanparamset)))
  38
  39 //! Memory needed to store a max number/size SSID TLV for a firmware scan
  40 #define SSID_TLV_MAX_SIZE  (1 * sizeof(struct mrvlietypes_ssidparamset))
  41
  42 //! Maximum memory needed for a lbs_scan_cmd_config with all TLVs at max
  43 #define MAX_SCAN_CFG_ALLOC (sizeof(struct lbs_scan_cmd_config)  \
  44                             + CHAN_TLV_MAX_SIZE                 \
  45                             + SSID_TLV_MAX_SIZE)
  46
  47 //! The maximum number of channels the firmware can scan per command
  48 #define MRVDRV_MAX_CHANNELS_PER_SCAN   14
  49
  50 /**
  51  * @brief Number of channels to scan per firmware scan command issuance.
  52  *
  53  *  Number restricted to prevent hitting the limit on the amount of scan data
  54  *  returned in a single firmware scan command.
  55  */
  56 #define MRVDRV_CHANNELS_PER_SCAN_CMD   4
  57
  58 //! Scan time specified in the channel TLV for each channel for passive scans
  59 #define MRVDRV_PASSIVE_SCAN_CHAN_TIME  100
  60
  61 //! Scan time specified in the channel TLV for each channel for active scans
  62 #define MRVDRV_ACTIVE_SCAN_CHAN_TIME   100
  63
  64 static const u8 zeromac[ETH_ALEN] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
  65 static const u8 bcastmac[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  66
  67
  68
  69
  70 /*********************************************************************/
  71 /*                                                                   */
  72 /*  Misc helper functions                                            */
  73 /*                                                                   */
  74 /*********************************************************************/
  75
  76 static inline void clear_bss_descriptor (struct bss_descriptor * bss)
  77 {
  78         /* Don't blow away ->list, just BSS data */
  79         memset(bss, 0, offsetof(struct bss_descriptor, list));
  80 }
  81
  82 static inline int match_bss_no_security(struct lbs_802_11_security *secinfo,
  83                         struct bss_descriptor * match_bss)
  84 {
  85         if (   !secinfo->wep_enabled
  86             && !secinfo->WPAenabled
  87             && !secinfo->WPA2enabled
  88             && match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC
  89             && match_bss->rsn_ie[0] != MFIE_TYPE_RSN
  90             && !(match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
  91                 return 1;
  92         }
  93         return 0;
  94 }
  95
  96 static inline int match_bss_static_wep(struct lbs_802_11_security *secinfo,
  97                         struct bss_descriptor * match_bss)
  98 {
  99         if ( secinfo->wep_enabled
 100            && !secinfo->WPAenabled
 101            && !secinfo->WPA2enabled
 102            && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 103                 return 1;
 104         }
 105         return 0;
 106 }
 107
 108 static inline int match_bss_wpa(struct lbs_802_11_security *secinfo,
 109                         struct bss_descriptor * match_bss)
 110 {
 111         if (  !secinfo->wep_enabled
 112            && secinfo->WPAenabled
 113            && (match_bss->wpa_ie[0] == MFIE_TYPE_GENERIC)
 114            /* privacy bit may NOT be set in some APs like LinkSys WRT54G
 115               && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 116             */
 117            ) {
 118                 return 1;
 119         }
 120         return 0;
 121 }
 122
 123 static inline int match_bss_wpa2(struct lbs_802_11_security *secinfo,
 124                         struct bss_descriptor * match_bss)
 125 {
 126         if (  !secinfo->wep_enabled
 127            && secinfo->WPA2enabled
 128            && (match_bss->rsn_ie[0] == MFIE_TYPE_RSN)
 129            /* privacy bit may NOT be set in some APs like LinkSys WRT54G
 130               && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 131             */
 132            ) {
 133                 return 1;
 134         }
 135         return 0;
 136 }
 137
 138 static inline int match_bss_dynamic_wep(struct lbs_802_11_security *secinfo,
 139                         struct bss_descriptor * match_bss)
 140 {
 141         if (  !secinfo->wep_enabled
 142            && !secinfo->WPAenabled
 143            && !secinfo->WPA2enabled
 144            && (match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC)
 145            && (match_bss->rsn_ie[0] != MFIE_TYPE_RSN)
 146            && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 147                 return 1;
 148         }
 149         return 0;
 150 }
 151
 152 /**
 153  *  @brief Check if a scanned network compatible with the driver settings
 154  *
 155  *   WEP     WPA     WPA2    ad-hoc  encrypt                      Network
 156  * enabled enabled  enabled   AES     mode   privacy  WPA  WPA2  Compatible
 157  *    0       0        0       0      NONE      0      0    0   yes No security
 158  *    1       0        0       0      NONE      1      0    0   yes Static WEP
 159  *    0       1        0       0       x        1x     1    x   yes WPA
 160  *    0       0        1       0       x        1x     x    1   yes WPA2
 161  *    0       0        0       1      NONE      1      0    0   yes Ad-hoc AES
 162  *    0       0        0       0     !=NONE     1      0    0   yes Dynamic WEP
 163  *
 164  *
 165  *  @param adapter A pointer to struct lbs_adapter
 166  *  @param index   Index in scantable to check against current driver settings
 167  *  @param mode    Network mode: Infrastructure or IBSS
 168  *
 169  *  @return        Index in scantable, or error code if negative
 170  */
 171 static int is_network_compatible(struct lbs_adapter *adapter,
 172                 struct bss_descriptor * bss, u8 mode)
 173 {
 174         int matched = 0;
 175
 176         lbs_deb_enter(LBS_DEB_SCAN);
 177
 178         if (bss->mode != mode)
 179                 goto done;
 180
 181         if ((matched = match_bss_no_security(&adapter->secinfo, bss))) {
 182                 goto done;
 183         } else if ((matched = match_bss_static_wep(&adapter->secinfo, bss))) {
 184                 goto done;
 185         } else if ((matched = match_bss_wpa(&adapter->secinfo, bss))) {
 186                 lbs_deb_scan(
 187                        "is_network_compatible() WPA: wpa_ie=%#x "
 188                        "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 189                        "privacy=%#x\n", bss->wpa_ie[0], bss->rsn_ie[0],
 190                        adapter->secinfo.wep_enabled ? "e" : "d",
 191                        adapter->secinfo.WPAenabled ? "e" : "d",
 192                        adapter->secinfo.WPA2enabled ? "e" : "d",
 193                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
 194                 goto done;
 195         } else if ((matched = match_bss_wpa2(&adapter->secinfo, bss))) {
 196                 lbs_deb_scan(
 197                        "is_network_compatible() WPA2: wpa_ie=%#x "
 198                        "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 199                        "privacy=%#x\n", bss->wpa_ie[0], bss->rsn_ie[0],
 200                        adapter->secinfo.wep_enabled ? "e" : "d",
 201                        adapter->secinfo.WPAenabled ? "e" : "d",
 202                        adapter->secinfo.WPA2enabled ? "e" : "d",
 203                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
 204                 goto done;
 205         } else if ((matched = match_bss_dynamic_wep(&adapter->secinfo, bss))) {
 206                 lbs_deb_scan(
 207                        "is_network_compatible() dynamic WEP: "
 208                        "wpa_ie=%#x wpa2_ie=%#x privacy=%#x\n",
 209                        bss->wpa_ie[0], bss->rsn_ie[0],
 210                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
 211                 goto done;
 212         }
 213
 214         /* bss security settings don't match those configured on card */
 215         lbs_deb_scan(
 216                "is_network_compatible() FAILED: wpa_ie=%#x "
 217                "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s privacy=%#x\n",
 218                bss->wpa_ie[0], bss->rsn_ie[0],
 219                adapter->secinfo.wep_enabled ? "e" : "d",
 220                adapter->secinfo.WPAenabled ? "e" : "d",
 221                adapter->secinfo.WPA2enabled ? "e" : "d",
 222                (bss->capability & WLAN_CAPABILITY_PRIVACY));
 223
 224 done:
 225         lbs_deb_leave_args(LBS_DEB_SCAN, "matched: %d", matched);
 226         return matched;
 227 }
 228
 229 /**
 230  *  @brief Compare two SSIDs
 231  *
 232  *  @param ssid1    A pointer to ssid to compare
 233  *  @param ssid2    A pointer to ssid to compare
 234  *
 235  *  @return         0--ssid is same, otherwise is different
 236  */
 237 int lbs_ssid_cmp(u8 *ssid1, u8 ssid1_len, u8 *ssid2, u8 ssid2_len)
 238 {
 239         if (ssid1_len != ssid2_len)
 240                 return -1;
 241
 242         return memcmp(ssid1, ssid2, ssid1_len);
 243 }
 244
 245
 246
 247
 248 /*********************************************************************/
 249 /*                                                                   */
 250 /*  Main scanning support                                            */
 251 /*                                                                   */
 252 /*********************************************************************/
 253
 254
 255 /**
 256  *  @brief Create a channel list for the driver to scan based on region info
 257  *
 258  *  Only used from lbs_scan_setup_scan_config()
 259  *
 260  *  Use the driver region/band information to construct a comprehensive list
 261  *    of channels to scan.  This routine is used for any scan that is not
 262  *    provided a specific channel list to scan.
 263  *
 264  *  @param priv          A pointer to struct lbs_private structure
 265  *  @param scanchanlist  Output parameter: resulting channel list to scan
 266  *  @param filteredscan  Flag indicating whether or not a BSSID or SSID filter
 267  *                       is being sent in the command to firmware.  Used to
 268  *                       increase the number of channels sent in a scan
 269  *                       command and to disable the firmware channel scan
 270  *                       filter.
 271  *
 272  *  @return              void
 273  */
 274 static void lbs_scan_create_channel_list(struct lbs_private *priv,
 275                                           struct chanscanparamset * scanchanlist,
 276                                           u8 filteredscan)
 277 {
 278
 279         struct lbs_adapter *adapter = priv->adapter;
 280         struct region_channel *scanregion;
 281         struct chan_freq_power *cfp;
 282         int rgnidx;
 283         int chanidx;
 284         int nextchan;
 285         u8 scantype;
 286
 287         lbs_deb_enter_args(LBS_DEB_SCAN, "filteredscan %d", filteredscan);
 288
 289         chanidx = 0;
 290
 291         /* Set the default scan type to the user specified type, will later
 292          *   be changed to passive on a per channel basis if restricted by
 293          *   regulatory requirements (11d or 11h)
 294          */
 295         scantype = CMD_SCAN_TYPE_ACTIVE;
 296
 297         for (rgnidx = 0; rgnidx < ARRAY_SIZE(adapter->region_channel); rgnidx++) {
 298                 if (priv->adapter->enable11d &&
 299                     (adapter->connect_status != LBS_CONNECTED) &&
 300                     (adapter->mesh_connect_status != LBS_CONNECTED)) {
 301                         /* Scan all the supported chan for the first scan */
 302                         if (!adapter->universal_channel[rgnidx].valid)
 303                                 continue;
 304                         scanregion = &adapter->universal_channel[rgnidx];
 305
 306                         /* clear the parsed_region_chan for the first scan */
 307                         memset(&adapter->parsed_region_chan, 0x00,
 308                                sizeof(adapter->parsed_region_chan));
 309                 } else {
 310                         if (!adapter->region_channel[rgnidx].valid)
 311                                 continue;
 312                         scanregion = &adapter->region_channel[rgnidx];
 313                 }
 314
 315                 for (nextchan = 0;
 316                      nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
 317
 318                         cfp = scanregion->CFP + nextchan;
 319
 320                         if (priv->adapter->enable11d) {
 321                                 scantype =
 322                                     lbs_get_scan_type_11d(cfp->channel,
 323                                                            &adapter->
 324                                                            parsed_region_chan);
 325                         }
 326
 327                         switch (scanregion->band) {
 328                         case BAND_B:
 329                         case BAND_G:
 330                         default:
 331                                 scanchanlist[chanidx].radiotype =
 332                                     CMD_SCAN_RADIO_TYPE_BG;
 333                                 break;
 334                         }
 335
 336                         if (scantype == CMD_SCAN_TYPE_PASSIVE) {
 337                                 scanchanlist[chanidx].maxscantime =
 338                                     cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
 339                                 scanchanlist[chanidx].chanscanmode.passivescan =
 340                                     1;
 341                         } else {
 342                                 scanchanlist[chanidx].maxscantime =
 343                                     cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
 344                                 scanchanlist[chanidx].chanscanmode.passivescan =
 345                                     0;
 346                         }
 347
 348                         scanchanlist[chanidx].channumber = cfp->channel;
 349
 350                         if (filteredscan) {
 351                                 scanchanlist[chanidx].chanscanmode.
 352                                     disablechanfilt = 1;
 353                         }
 354                 }
 355         }
 356 }
 357
 358
 359 /* Delayed partial scan worker */
 360 void lbs_scan_worker(struct work_struct *work)
 361 {
 362         struct lbs_private *priv = container_of(work,
 363                 struct lbs_private,
 364                 scan_work.work);
 365
 366         lbs_scan_networks(priv, NULL, 0);
 367 }
 368
 369
 370 /**
 371  *  @brief Construct a lbs_scan_cmd_config structure to use in issue scan cmds
 372  *
 373  *  Application layer or other functions can invoke lbs_scan_networks
 374  *    with a scan configuration supplied in a lbs_ioctl_user_scan_cfg struct.
 375  *    This structure is used as the basis of one or many lbs_scan_cmd_config
 376  *    commands that are sent to the command processing module and sent to
 377  *    firmware.
 378  *
 379  *  Create a lbs_scan_cmd_config based on the following user supplied
 380  *    parameters (if present):
 381  *             - SSID filter
 382  *             - BSSID filter
 383  *             - Number of Probes to be sent
 384  *             - channel list
 385  *
 386  *  If the SSID or BSSID filter is not present, disable/clear the filter.
 387  *  Qualify the channel
 388  *
 389  *  @param priv             A pointer to struct lbs_private structure
 390  *  @param puserscanin      NULL or pointer to scan configuration parameters
 391  *  @param ppchantlvout     Output parameter: Pointer to the start of the
 392  *                          channel TLV portion of the output scan config
 393  *  @param pscanchanlist    Output parameter: Pointer to the resulting channel
 394  *                          list to scan
 395  *  @param pmaxchanperscan  Output parameter: Number of channels to scan for
 396  *                          each issuance of the firmware scan command
 397  *  @param pfilteredscan    Output parameter: Flag indicating whether or not
 398  *                          a BSSID or SSID filter is being sent in the
 399  *                          command to firmware.  Used to increase the number
 400  *                          of channels sent in a scan command and to
 401  *                          disable the firmware channel scan filter.
 402  *  @param pscancurrentonly Output parameter: Flag indicating whether or not
 403  *                          we are only scanning our current active channel
 404  *
 405  *  @return                 resulting scan configuration
 406  */
 407 static struct lbs_scan_cmd_config *
 408 lbs_scan_setup_scan_config(struct lbs_private *priv,
 409                             const struct lbs_ioctl_user_scan_cfg *puserscanin,
 410                             struct mrvlietypes_chanlistparamset ** ppchantlvout,
 411                             struct chanscanparamset * pscanchanlist,
 412                             int *pmaxchanperscan,
 413                             u8 * pfilteredscan,
 414                             u8 * pscancurrentonly)
 415 {
 416         struct mrvlietypes_ssidparamset *pssidtlv;
 417         struct lbs_scan_cmd_config *pscancfgout = NULL;
 418         u8 *ptlvpos;
 419
 420         lbs_deb_enter(LBS_DEB_SCAN);
 421
 422         pscancfgout = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
 423         if (pscancfgout == NULL)
 424                 goto out;
 425
 426         /* The tlvbufferlen is calculated for each scan command.  The TLVs added
 427          *   in this routine will be preserved since the routine that sends
 428          *   the command will append channelTLVs at *ppchantlvout.  The difference
 429          *   between the *ppchantlvout and the tlvbuffer start will be used
 430          *   to calculate the size of anything we add in this routine.
 431          */
 432         pscancfgout->tlvbufferlen = 0;
 433
 434         /* Running tlv pointer.  Assigned to ppchantlvout at end of function
 435          *  so later routines know where channels can be added to the command buf
 436          */
 437         ptlvpos = pscancfgout->tlvbuffer;
 438
 439         /*
 440          * Set the initial scan paramters for progressive scanning.  If a specific
 441          *   BSSID or SSID is used, the number of channels in the scan command
 442          *   will be increased to the absolute maximum
 443          */
 444         *pmaxchanperscan = MRVDRV_CHANNELS_PER_SCAN_CMD;
 445
 446         /* Initialize the scan as un-filtered by firmware, set to TRUE below if
 447          *   a SSID or BSSID filter is sent in the command
 448          */
 449         *pfilteredscan = 0;
 450
 451         /* Initialize the scan as not being only on the current channel.  If
 452          *   the channel list is customized, only contains one channel, and
 453          *   is the active channel, this is set true and data flow is not halted.
 454          */
 455         *pscancurrentonly = 0;
 456
 457         if (puserscanin) {
 458                 /* Set the bss type scan filter, use adapter setting if unset */
 459                 pscancfgout->bsstype =
 460                     puserscanin->bsstype ? puserscanin->bsstype : CMD_BSS_TYPE_ANY;
 461
 462                 /*
 463                  * Set the BSSID filter to the incoming configuration,
 464                  *   if non-zero.  If not set, it will remain disabled (all zeros).
 465                  */
 466                 memcpy(pscancfgout->bssid, puserscanin->bssid,
 467                        sizeof(pscancfgout->bssid));
 468
 469                 if (puserscanin->ssid_len) {
 470                         pssidtlv =
 471                             (struct mrvlietypes_ssidparamset *) pscancfgout->
 472                             tlvbuffer;
 473                         pssidtlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
 474                         pssidtlv->header.len = cpu_to_le16(puserscanin->ssid_len);
 475                         memcpy(pssidtlv->ssid, puserscanin->ssid,
 476                                puserscanin->ssid_len);
 477                         ptlvpos += sizeof(pssidtlv->header) + puserscanin->ssid_len;
 478                 }
 479
 480                 /*
 481                  *  The default number of channels sent in the command is low to
 482                  *    ensure the response buffer from the firmware does not truncate
 483                  *    scan results.  That is not an issue with an SSID or BSSID
 484                  *    filter applied to the scan results in the firmware.
 485                  */
 486                 if (   puserscanin->ssid_len
 487                     || (compare_ether_addr(pscancfgout->bssid, &zeromac[0]) != 0)) {
 488                         *pmaxchanperscan = MRVDRV_MAX_CHANNELS_PER_SCAN;
 489                         *pfilteredscan = 1;
 490                 }
 491         } else {
 492                 pscancfgout->bsstype = CMD_BSS_TYPE_ANY;
 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).
 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         lbs_scan_create_channel_list(priv, pscanchanlist,
 504                                       *pfilteredscan);
 505 out:
 506         return pscancfgout;
 507 }
 508
 509 /**
 510  *  @brief Construct and send multiple scan config commands to the firmware
 511  *
 512  *  Only used from lbs_scan_networks()
 513  *
 514  *  Previous routines have created a lbs_scan_cmd_config with any requested
 515  *   TLVs.  This function splits the channel TLV into maxchanperscan lists
 516  *   and sends the portion of the channel TLV along with the other TLVs
 517  *   to the lbs_cmd routines for execution in the firmware.
 518  *
 519  *  @param priv            A pointer to struct lbs_private structure
 520  *  @param maxchanperscan  Maximum number channels to be included in each
 521  *                         scan command sent to firmware
 522  *  @param filteredscan    Flag indicating whether or not a BSSID or SSID
 523  *                         filter is being used for the firmware command
 524  *                         scan command sent to firmware
 525  *  @param pscancfgout     Scan configuration used for this scan.
 526  *  @param pchantlvout     Pointer in the pscancfgout where the channel TLV
 527  *                         should start.  This is past any other TLVs that
 528  *                         must be sent down in each firmware command.
 529  *  @param pscanchanlist   List of channels to scan in maxchanperscan segments
 530  *
 531  *  @return                0 or error return otherwise
 532  */
 533 static int lbs_scan_channel_list(struct lbs_private *priv,
 534                                   int maxchanperscan,
 535                                   u8 filteredscan,
 536                                   struct lbs_scan_cmd_config *pscancfgout,
 537                                   struct mrvlietypes_chanlistparamset * pchantlvout,
 538                                   struct chanscanparamset * pscanchanlist,
 539                                   const struct lbs_ioctl_user_scan_cfg *puserscanin,
 540                                   int full_scan)
 541 {
 542         struct chanscanparamset *ptmpchan;
 543         struct chanscanparamset *pstartchan;
 544         u8 scanband;
 545         int doneearly;
 546         int tlvidx;
 547         int ret = 0;
 548         int scanned = 0;
 549         union iwreq_data wrqu;
 550
 551         lbs_deb_enter_args(LBS_DEB_SCAN, "maxchanperscan %d, filteredscan %d, "
 552                 "full_scan %d", maxchanperscan, filteredscan, full_scan);
 553
 554         if (!pscancfgout || !pchantlvout || !pscanchanlist) {
 555                 lbs_deb_scan("pscancfgout, pchantlvout or "
 556                         "pscanchanlist is NULL\n");
 557                 ret = -1;
 558                 goto out;
 559         }
 560
 561         pchantlvout->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 562
 563         /* Set the temp channel struct pointer to the start of the desired list */
 564         ptmpchan = pscanchanlist;
 565
 566         if (priv->adapter->last_scanned_channel && !puserscanin)
 567                 ptmpchan += priv->adapter->last_scanned_channel;
 568
 569         /* Loop through the desired channel list, sending a new firmware scan
 570          *   commands for each maxchanperscan channels (or for 1,6,11 individually
 571          *   if configured accordingly)
 572          */
 573         while (ptmpchan->channumber) {
 574
 575                 tlvidx = 0;
 576                 pchantlvout->header.len = 0;
 577                 scanband = ptmpchan->radiotype;
 578                 pstartchan = ptmpchan;
 579                 doneearly = 0;
 580
 581                 /* Construct the channel TLV for the scan command.  Continue to
 582                  *  insert channel TLVs until:
 583                  *    - the tlvidx hits the maximum configured per scan command
 584                  *    - the next channel to insert is 0 (end of desired channel list)
 585                  *    - doneearly is set (controlling individual scanning of 1,6,11)
 586                  */
 587                 while (tlvidx < maxchanperscan && ptmpchan->channumber
 588                        && !doneearly && scanned < 2) {
 589
 590                         lbs_deb_scan("channel %d, radio %d, passive %d, "
 591                                 "dischanflt %d, maxscantime %d\n",
 592                                 ptmpchan->channumber,
 593                                 ptmpchan->radiotype,
 594                                      ptmpchan->chanscanmode.passivescan,
 595                                      ptmpchan->chanscanmode.disablechanfilt,
 596                                      ptmpchan->maxscantime);
 597
 598                         /* Copy the current channel TLV to the command being prepared */
 599                         memcpy(pchantlvout->chanscanparam + tlvidx,
 600                                ptmpchan, sizeof(pchantlvout->chanscanparam));
 601
 602                         /* Increment the TLV header length by the size appended */
 603                         /* Ew, it would be _so_ nice if we could just declare the
 604                            variable little-endian and let GCC handle it for us */
 605                         pchantlvout->header.len =
 606                                 cpu_to_le16(le16_to_cpu(pchantlvout->header.len) +
 607                                             sizeof(pchantlvout->chanscanparam));
 608
 609                         /*
 610                          *  The tlv buffer length is set to the number of bytes of the
 611                          *    between the channel tlv pointer and the start of the
 612                          *    tlv buffer.  This compensates for any TLVs that were appended
 613                          *    before the channel list.
 614                          */
 615                         pscancfgout->tlvbufferlen = ((u8 *) pchantlvout
 616                                                      - pscancfgout->tlvbuffer);
 617
 618                         /*  Add the size of the channel tlv header and the data length */
 619                         pscancfgout->tlvbufferlen +=
 620                             (sizeof(pchantlvout->header)
 621                              + le16_to_cpu(pchantlvout->header.len));
 622
 623                         /* Increment the index to the channel tlv we are constructing */
 624                         tlvidx++;
 625
 626                         doneearly = 0;
 627
 628                         /* Stop the loop if the *current* channel is in the 1,6,11 set
 629                          *   and we are not filtering on a BSSID or SSID.
 630                          */
 631                         if (!filteredscan && (ptmpchan->channumber == 1
 632                                               || ptmpchan->channumber == 6
 633                                               || ptmpchan->channumber == 11)) {
 634                                 doneearly = 1;
 635                         }
 636
 637                         /* Increment the tmp pointer to the next channel to be scanned */
 638                         ptmpchan++;
 639                         scanned++;
 640
 641                         /* Stop the loop if the *next* channel is in the 1,6,11 set.
 642                          *  This will cause it to be the only channel scanned on the next
 643                          *  interation
 644                          */
 645                         if (!filteredscan && (ptmpchan->channumber == 1
 646                                               || ptmpchan->channumber == 6
 647                                               || ptmpchan->channumber == 11)) {
 648                                 doneearly = 1;
 649                         }
 650                 }
 651
 652                 /* Send the scan command to the firmware with the specified cfg */
 653                 ret = lbs_prepare_and_send_command(priv, CMD_802_11_SCAN, 0,
 654                                             0, 0, pscancfgout);
 655                 if (scanned >= 2 && !full_scan) {
 656                         ret = 0;
 657                         goto done;
 658                 }
 659                 scanned = 0;
 660         }
 661
 662 done:
 663         priv->adapter->last_scanned_channel = ptmpchan->channumber;
 664
 665         if (priv->adapter->last_scanned_channel) {
 666                 /* Schedule the next part of the partial scan */
 667                 if (!full_scan && !priv->adapter->surpriseremoved) {
 668                         cancel_delayed_work(&priv->scan_work);
 669                         queue_delayed_work(priv->work_thread, &priv->scan_work,
 670                                            msecs_to_jiffies(300));
 671                 }
 672         } else {
 673                 /* All done, tell userspace the scan table has been updated */
 674                 memset(&wrqu, 0, sizeof(union iwreq_data));
 675                 wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
 676         }
 677
 678 out:
 679         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 680         return ret;
 681 }
 682
 683 /*
 684  * Only used from lbs_scan_networks()
 685 */
 686 static void clear_selected_scan_list_entries(struct lbs_adapter *adapter,
 687         const struct lbs_ioctl_user_scan_cfg *scan_cfg)
 688 {
 689         struct bss_descriptor *bss;
 690         struct bss_descriptor *safe;
 691         u32 clear_ssid_flag = 0, clear_bssid_flag = 0;
 692
 693         lbs_deb_enter(LBS_DEB_SCAN);
 694
 695         if (!scan_cfg)
 696                 goto out;
 697
 698         if (scan_cfg->clear_ssid && scan_cfg->ssid_len)
 699                 clear_ssid_flag = 1;
 700
 701         if (scan_cfg->clear_bssid
 702             && (compare_ether_addr(scan_cfg->bssid, &zeromac[0]) != 0)
 703             && (compare_ether_addr(scan_cfg->bssid, &bcastmac[0]) != 0)) {
 704                 clear_bssid_flag = 1;
 705         }
 706
 707         if (!clear_ssid_flag && !clear_bssid_flag)
 708                 goto out;
 709
 710         mutex_lock(&adapter->lock);
 711         list_for_each_entry_safe (bss, safe, &adapter->network_list, list) {
 712                 u32 clear = 0;
 713
 714                 /* Check for an SSID match */
 715                 if (   clear_ssid_flag
 716                     && (bss->ssid_len == scan_cfg->ssid_len)
 717                     && !memcmp(bss->ssid, scan_cfg->ssid, bss->ssid_len))
 718                         clear = 1;
 719
 720                 /* Check for a BSSID match */
 721                 if (   clear_bssid_flag
 722                     && !compare_ether_addr(bss->bssid, scan_cfg->bssid))
 723                         clear = 1;
 724
 725                 if (clear) {
 726                         list_move_tail (&bss->list, &adapter->network_free_list);
 727                         clear_bss_descriptor(bss);
 728                 }
 729         }
 730         mutex_unlock(&adapter->lock);
 731 out:
 732         lbs_deb_leave(LBS_DEB_SCAN);
 733 }
 734
 735
 736 /**
 737  *  @brief Internal function used to start a scan based on an input config
 738  *
 739  *  Also used from debugfs
 740  *
 741  *  Use the input user scan configuration information when provided in
 742  *    order to send the appropriate scan commands to firmware to populate or
 743  *    update the internal driver scan table
 744  *
 745  *  @param priv          A pointer to struct lbs_private structure
 746  *  @param puserscanin   Pointer to the input configuration for the requested
 747  *                       scan.
 748  *  @param full_scan     ???
 749  *
 750  *  @return              0 or < 0 if error
 751  */
 752 int lbs_scan_networks(struct lbs_private *priv,
 753         const struct lbs_ioctl_user_scan_cfg *puserscanin,
 754                        int full_scan)
 755 {
 756         struct lbs_adapter *adapter = priv->adapter;
 757         struct mrvlietypes_chanlistparamset *pchantlvout;
 758         struct chanscanparamset * scan_chan_list = NULL;
 759         struct lbs_scan_cmd_config *scan_cfg = NULL;
 760         u8 filteredscan;
 761         u8 scancurrentchanonly;
 762         int maxchanperscan;
 763         int ret;
 764 #ifdef CONFIG_LIBERTAS_DEBUG
 765         struct bss_descriptor * iter_bss;
 766         int i = 0;
 767         DECLARE_MAC_BUF(mac);
 768 #endif
 769
 770         lbs_deb_enter_args(LBS_DEB_SCAN, "full_scan %d", full_scan);
 771
 772         /* Cancel any partial outstanding partial scans if this scan
 773          * is a full scan.
 774          */
 775         if (full_scan && delayed_work_pending(&priv->scan_work))
 776                 cancel_delayed_work(&priv->scan_work);
 777
 778         scan_chan_list = kzalloc(sizeof(struct chanscanparamset) *
 779                                 LBS_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
 780         if (scan_chan_list == NULL) {
 781                 ret = -ENOMEM;
 782                 goto out;
 783         }
 784
 785         scan_cfg = lbs_scan_setup_scan_config(priv,
 786                                                puserscanin,
 787                                                &pchantlvout,
 788                                                scan_chan_list,
 789                                                &maxchanperscan,
 790                                                &filteredscan,
 791                                                &scancurrentchanonly);
 792         if (scan_cfg == NULL) {
 793                 ret = -ENOMEM;
 794                 goto out;
 795         }
 796
 797         clear_selected_scan_list_entries(adapter, puserscanin);
 798
 799         /* Keep the data path active if we are only scanning our current channel */
 800         if (!scancurrentchanonly) {
 801                 netif_stop_queue(priv->dev);
 802                 netif_carrier_off(priv->dev);
 803                 if (priv->mesh_dev) {
 804                         netif_stop_queue(priv->mesh_dev);
 805                         netif_carrier_off(priv->mesh_dev);
 806                 }
 807         }
 808
 809         ret = lbs_scan_channel_list(priv,
 810                                      maxchanperscan,
 811                                      filteredscan,
 812                                      scan_cfg,
 813                                      pchantlvout,
 814                                      scan_chan_list,
 815                                      puserscanin,
 816                                      full_scan);
 817
 818 #ifdef CONFIG_LIBERTAS_DEBUG
 819         /* Dump the scan table */
 820         mutex_lock(&adapter->lock);
 821         lbs_deb_scan("The scan table contains:\n");
 822         list_for_each_entry (iter_bss, &adapter->network_list, list) {
 823                 lbs_deb_scan("scan %02d, %s, RSSI, %d, SSID '%s'\n",
 824                        i++, print_mac(mac, iter_bss->bssid), (s32) iter_bss->rssi,
 825                        escape_essid(iter_bss->ssid, iter_bss->ssid_len));
 826         }
 827         mutex_unlock(&adapter->lock);
 828 #endif
 829
 830         if (adapter->connect_status == LBS_CONNECTED) {
 831                 netif_carrier_on(priv->dev);
 832                 netif_wake_queue(priv->dev);
 833         }
 834
 835         if (priv->mesh_dev && (adapter->mesh_connect_status == LBS_CONNECTED)) {
 836                 netif_carrier_on(priv->mesh_dev);
 837                 netif_wake_queue(priv->mesh_dev);
 838         }
 839
 840 out:
 841         if (scan_cfg)
 842                 kfree(scan_cfg);
 843
 844         if (scan_chan_list)
 845                 kfree(scan_chan_list);
 846
 847         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 848         return ret;
 849 }
 850
 851 /**
 852  *  @brief Interpret a BSS scan response returned from the firmware
 853  *
 854  *  Parse the various fixed fields and IEs passed back for a a BSS probe
 855  *   response or beacon from the scan command.  Record information as needed
 856  *   in the scan table struct bss_descriptor for that entry.
 857  *
 858  *  @param bss  Output parameter: Pointer to the BSS Entry
 859  *
 860  *  @return             0 or -1
 861  */
 862 static int lbs_process_bss(struct bss_descriptor *bss,
 863                                 u8 ** pbeaconinfo, int *bytesleft)
 864 {
 865         struct ieeetypes_fhparamset *pFH;
 866         struct ieeetypes_dsparamset *pDS;
 867         struct ieeetypes_cfparamset *pCF;
 868         struct ieeetypes_ibssparamset *pibss;
 869         DECLARE_MAC_BUF(mac);
 870         struct ieeetypes_countryinfoset *pcountryinfo;
 871         u8 *pos, *end, *p;
 872         u8 n_ex_rates = 0, got_basic_rates = 0, n_basic_rates = 0;
 873         u16 beaconsize = 0;
 874         int ret;
 875
 876         lbs_deb_enter(LBS_DEB_SCAN);
 877
 878         if (*bytesleft >= sizeof(beaconsize)) {
 879                 /* Extract & convert beacon size from the command buffer */
 880                 beaconsize = le16_to_cpu(get_unaligned((u16 *)*pbeaconinfo));
 881                 *bytesleft -= sizeof(beaconsize);
 882                 *pbeaconinfo += sizeof(beaconsize);
 883         }
 884
 885         if (beaconsize == 0 || beaconsize > *bytesleft) {
 886                 *pbeaconinfo += *bytesleft;
 887                 *bytesleft = 0;
 888                 ret = -1;
 889                 goto done;
 890         }
 891
 892         /* Initialize the current working beacon pointer for this BSS iteration */
 893         pos = *pbeaconinfo;
 894         end = pos + beaconsize;
 895
 896         /* Advance the return beacon pointer past the current beacon */
 897         *pbeaconinfo += beaconsize;
 898         *bytesleft -= beaconsize;
 899
 900         memcpy(bss->bssid, pos, ETH_ALEN);
 901         lbs_deb_scan("process_bss: AP BSSID %s\n", print_mac(mac, bss->bssid));
 902         pos += ETH_ALEN;
 903
 904         if ((end - pos) < 12) {
 905                 lbs_deb_scan("process_bss: Not enough bytes left\n");
 906                 ret = -1;
 907                 goto done;
 908         }
 909
 910         /*
 911          * next 4 fields are RSSI, time stamp, beacon interval,
 912          *   and capability information
 913          */
 914
 915         /* RSSI is 1 byte long */
 916         bss->rssi = *pos;
 917         lbs_deb_scan("process_bss: RSSI=%02X\n", *pos);
 918         pos++;
 919
 920         /* time stamp is 8 bytes long */
 921         pos += 8;
 922
 923         /* beacon interval is 2 bytes long */
 924         bss->beaconperiod = le16_to_cpup((void *) pos);
 925         pos += 2;
 926
 927         /* capability information is 2 bytes long */
 928         bss->capability = le16_to_cpup((void *) pos);
 929         lbs_deb_scan("process_bss: capabilities = 0x%4X\n", bss->capability);
 930         pos += 2;
 931
 932         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 933                 lbs_deb_scan("process_bss: AP WEP enabled\n");
 934         if (bss->capability & WLAN_CAPABILITY_IBSS)
 935                 bss->mode = IW_MODE_ADHOC;
 936         else
 937                 bss->mode = IW_MODE_INFRA;
 938
 939         /* rest of the current buffer are IE's */
 940         lbs_deb_scan("process_bss: IE length for this AP = %zd\n", end - pos);
 941         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: IE info", pos, end - pos);
 942
 943         /* process variable IE */
 944         while (pos <= end - 2) {
 945                 struct ieee80211_info_element * elem =
 946                         (struct ieee80211_info_element *) pos;
 947
 948                 if (pos + elem->len > end) {
 949                         lbs_deb_scan("process_bss: error in processing IE, "
 950                                "bytes left < IE length\n");
 951                         break;
 952                 }
 953
 954                 switch (elem->id) {
 955                 case MFIE_TYPE_SSID:
 956                         bss->ssid_len = elem->len;
 957                         memcpy(bss->ssid, elem->data, elem->len);
 958                         lbs_deb_scan("ssid '%s', ssid length %u\n",
 959                                      escape_essid(bss->ssid, bss->ssid_len),
 960                                      bss->ssid_len);
 961                         break;
 962
 963                 case MFIE_TYPE_RATES:
 964                         n_basic_rates = min_t(u8, MAX_RATES, elem->len);
 965                         memcpy(bss->rates, elem->data, n_basic_rates);
 966                         got_basic_rates = 1;
 967                         break;
 968
 969                 case MFIE_TYPE_FH_SET:
 970                         pFH = (struct ieeetypes_fhparamset *) pos;
 971                         memmove(&bss->phyparamset.fhparamset, pFH,
 972                                 sizeof(struct ieeetypes_fhparamset));
 973 #if 0 /* I think we can store these LE */
 974                         bss->phyparamset.fhparamset.dwelltime
 975                             = le16_to_cpu(bss->phyparamset.fhparamset.dwelltime);
 976 #endif
 977                         break;
 978
 979                 case MFIE_TYPE_DS_SET:
 980                         pDS = (struct ieeetypes_dsparamset *) pos;
 981                         bss->channel = pDS->currentchan;
 982                         memcpy(&bss->phyparamset.dsparamset, pDS,
 983                                sizeof(struct ieeetypes_dsparamset));
 984                         break;
 985
 986                 case MFIE_TYPE_CF_SET:
 987                         pCF = (struct ieeetypes_cfparamset *) pos;
 988                         memcpy(&bss->ssparamset.cfparamset, pCF,
 989                                sizeof(struct ieeetypes_cfparamset));
 990                         break;
 991
 992                 case MFIE_TYPE_IBSS_SET:
 993                         pibss = (struct ieeetypes_ibssparamset *) pos;
 994                         bss->atimwindow = le32_to_cpu(pibss->atimwindow);
 995                         memmove(&bss->ssparamset.ibssparamset, pibss,
 996                                 sizeof(struct ieeetypes_ibssparamset));
 997 #if 0
 998                         bss->ssparamset.ibssparamset.atimwindow
 999                             = le16_to_cpu(bss->ssparamset.ibssparamset.atimwindow);
1000 #endif
1001                         break;
1002
1003                 case MFIE_TYPE_COUNTRY:
1004                         pcountryinfo = (struct ieeetypes_countryinfoset *) pos;
1005                         if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
1006                             || pcountryinfo->len > 254) {
1007                                 lbs_deb_scan("process_bss: 11D- Err "
1008                                        "CountryInfo len =%d min=%zd max=254\n",
1009                                        pcountryinfo->len,
1010                                        sizeof(pcountryinfo->countrycode));
1011                                 ret = -1;
1012                                 goto done;
1013                         }
1014
1015                         memcpy(&bss->countryinfo,
1016                                pcountryinfo, pcountryinfo->len + 2);
1017                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: 11d countryinfo",
1018                                 (u8 *) pcountryinfo,
1019                                 (u32) (pcountryinfo->len + 2));
1020                         break;
1021
1022                 case MFIE_TYPE_RATES_EX:
1023                         /* only process extended supported rate if data rate is
1024                          * already found. Data rate IE should come before
1025                          * extended supported rate IE
1026                          */
1027                         if (!got_basic_rates)
1028                                 break;
1029
1030                         n_ex_rates = elem->len;
1031                         if (n_basic_rates + n_ex_rates > MAX_RATES)
1032                                 n_ex_rates = MAX_RATES - n_basic_rates;
1033
1034                         p = bss->rates + n_basic_rates;
1035                         memcpy(p, elem->data, n_ex_rates);
1036                         break;
1037
1038                 case MFIE_TYPE_GENERIC:
1039                         if (elem->len >= 4 &&
1040                             elem->data[0] == 0x00 &&
1041                             elem->data[1] == 0x50 &&
1042                             elem->data[2] == 0xf2 &&
1043                             elem->data[3] == 0x01) {
1044                                 bss->wpa_ie_len = min(elem->len + 2,
1045                                                       MAX_WPA_IE_LEN);
1046                                 memcpy(bss->wpa_ie, elem, bss->wpa_ie_len);
1047                                 lbs_deb_hex(LBS_DEB_SCAN, "process_bss: WPA IE", bss->wpa_ie,
1048                                             elem->len);
1049                         } else if (elem->len >= MARVELL_MESH_IE_LENGTH &&
1050                             elem->data[0] == 0x00 &&
1051                             elem->data[1] == 0x50 &&
1052                             elem->data[2] == 0x43 &&
1053                             elem->data[3] == 0x04) {
1054                                 bss->mesh = 1;
1055                         }
1056                         break;
1057
1058                 case MFIE_TYPE_RSN:
1059                         bss->rsn_ie_len = min(elem->len + 2, MAX_WPA_IE_LEN);
1060                         memcpy(bss->rsn_ie, elem, bss->rsn_ie_len);
1061                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: RSN_IE", bss->rsn_ie, elem->len);
1062                         break;
1063
1064                 default:
1065                         break;
1066                 }
1067
1068                 pos += elem->len + 2;
1069         }
1070
1071         /* Timestamp */
1072         bss->last_scanned = jiffies;
1073         lbs_unset_basic_rate_flags(bss->rates, sizeof(bss->rates));
1074
1075         ret = 0;
1076
1077 done:
1078         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1079         return ret;
1080 }
1081
1082 /**
1083  *  @brief This function finds a specific compatible BSSID in the scan list
1084  *
1085  *  Used in association code
1086  *
1087  *  @param adapter  A pointer to struct lbs_adapter
1088  *  @param bssid    BSSID to find in the scan list
1089  *  @param mode     Network mode: Infrastructure or IBSS
1090  *
1091  *  @return         index in BSSID list, or error return code (< 0)
1092  */
1093 struct bss_descriptor *lbs_find_bssid_in_list(struct lbs_adapter *adapter,
1094                 u8 * bssid, u8 mode)
1095 {
1096         struct bss_descriptor * iter_bss;
1097         struct bss_descriptor * found_bss = NULL;
1098
1099         lbs_deb_enter(LBS_DEB_SCAN);
1100
1101         if (!bssid)
1102                 goto out;
1103
1104         lbs_deb_hex(LBS_DEB_SCAN, "looking for",
1105                 bssid, ETH_ALEN);
1106
1107         /* Look through the scan table for a compatible match.  The loop will
1108          *   continue past a matched bssid that is not compatible in case there
1109          *   is an AP with multiple SSIDs assigned to the same BSSID
1110          */
1111         mutex_lock(&adapter->lock);
1112         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1113                 if (compare_ether_addr(iter_bss->bssid, bssid))
1114                         continue; /* bssid doesn't match */
1115                 switch (mode) {
1116                 case IW_MODE_INFRA:
1117                 case IW_MODE_ADHOC:
1118                         if (!is_network_compatible(adapter, iter_bss, mode))
1119                                 break;
1120                         found_bss = iter_bss;
1121                         break;
1122                 default:
1123                         found_bss = iter_bss;
1124                         break;
1125                 }
1126         }
1127         mutex_unlock(&adapter->lock);
1128
1129 out:
1130         lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss);
1131         return found_bss;
1132 }
1133
1134 /**
1135  *  @brief This function finds ssid in ssid list.
1136  *
1137  *  Used in association code
1138  *
1139  *  @param adapter  A pointer to struct lbs_adapter
1140  *  @param ssid     SSID to find in the list
1141  *  @param bssid    BSSID to qualify the SSID selection (if provided)
1142  *  @param mode     Network mode: Infrastructure or IBSS
1143  *
1144  *  @return         index in BSSID list
1145  */
1146 struct bss_descriptor *lbs_find_ssid_in_list(struct lbs_adapter *adapter,
1147                    u8 *ssid, u8 ssid_len, u8 * bssid, u8 mode,
1148                    int channel)
1149 {
1150         u8 bestrssi = 0;
1151         struct bss_descriptor * iter_bss = NULL;
1152         struct bss_descriptor * found_bss = NULL;
1153         struct bss_descriptor * tmp_oldest = NULL;
1154
1155         lbs_deb_enter(LBS_DEB_SCAN);
1156
1157         mutex_lock(&adapter->lock);
1158
1159         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1160                 if (   !tmp_oldest
1161                     || (iter_bss->last_scanned < tmp_oldest->last_scanned))
1162                         tmp_oldest = iter_bss;
1163
1164                 if (lbs_ssid_cmp(iter_bss->ssid, iter_bss->ssid_len,
1165                                       ssid, ssid_len) != 0)
1166                         continue; /* ssid doesn't match */
1167                 if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
1168                         continue; /* bssid doesn't match */
1169                 if ((channel > 0) && (iter_bss->channel != channel))
1170                         continue; /* channel doesn't match */
1171
1172                 switch (mode) {
1173                 case IW_MODE_INFRA:
1174                 case IW_MODE_ADHOC:
1175                         if (!is_network_compatible(adapter, iter_bss, mode))
1176                                 break;
1177
1178                         if (bssid) {
1179                                 /* Found requested BSSID */
1180                                 found_bss = iter_bss;
1181                                 goto out;
1182                         }
1183
1184                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1185                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1186                                 found_bss = iter_bss;
1187                         }
1188                         break;
1189                 case IW_MODE_AUTO:
1190                 default:
1191                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1192                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1193                                 found_bss = iter_bss;
1194                         }
1195                         break;
1196                 }
1197         }
1198
1199 out:
1200         mutex_unlock(&adapter->lock);
1201         lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss);
1202         return found_bss;
1203 }
1204
1205 /**
1206  *  @brief This function finds the best SSID in the Scan List
1207  *
1208  *  Search the scan table for the best SSID that also matches the current
1209  *   adapter network preference (infrastructure or adhoc)
1210  *
1211  *  @param adapter  A pointer to struct lbs_adapter
1212  *
1213  *  @return         index in BSSID list
1214  */
1215 static struct bss_descriptor *lbs_find_best_ssid_in_list(
1216         struct lbs_adapter *adapter,
1217         u8 mode)
1218 {
1219         u8 bestrssi = 0;
1220         struct bss_descriptor * iter_bss;
1221         struct bss_descriptor * best_bss = NULL;
1222
1223         lbs_deb_enter(LBS_DEB_SCAN);
1224
1225         mutex_lock(&adapter->lock);
1226
1227         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1228                 switch (mode) {
1229                 case IW_MODE_INFRA:
1230                 case IW_MODE_ADHOC:
1231                         if (!is_network_compatible(adapter, iter_bss, mode))
1232                                 break;
1233                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1234                                 break;
1235                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1236                         best_bss = iter_bss;
1237                         break;
1238                 case IW_MODE_AUTO:
1239                 default:
1240                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1241                                 break;
1242                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1243                         best_bss = iter_bss;
1244                         break;
1245                 }
1246         }
1247
1248         mutex_unlock(&adapter->lock);
1249         lbs_deb_leave_args(LBS_DEB_SCAN, "best_bss %p", best_bss);
1250         return best_bss;
1251 }
1252
1253 /**
1254  *  @brief Find the AP with specific ssid in the scan list
1255  *
1256  *  Used from association worker.
1257  *
1258  *  @param priv         A pointer to struct lbs_private structure
1259  *  @param pSSID        A pointer to AP's ssid
1260  *
1261  *  @return             0--success, otherwise--fail
1262  */
1263 int lbs_find_best_network_ssid(struct lbs_private *priv,
1264                 u8 *out_ssid, u8 *out_ssid_len, u8 preferred_mode, u8 *out_mode)
1265 {
1266         struct lbs_adapter *adapter = priv->adapter;
1267         int ret = -1;
1268         struct bss_descriptor * found;
1269
1270         lbs_deb_enter(LBS_DEB_SCAN);
1271
1272         lbs_scan_networks(priv, NULL, 1);
1273         if (adapter->surpriseremoved)
1274                 goto out;
1275
1276         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1277
1278         found = lbs_find_best_ssid_in_list(adapter, preferred_mode);
1279         if (found && (found->ssid_len > 0)) {
1280                 memcpy(out_ssid, &found->ssid, IW_ESSID_MAX_SIZE);
1281                 *out_ssid_len = found->ssid_len;
1282                 *out_mode = found->mode;
1283                 ret = 0;
1284         }
1285
1286 out:
1287         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1288         return ret;
1289 }
1290
1291 /**
1292  *  @brief Scan Network
1293  *
1294  *  @param dev          A pointer to net_device structure
1295  *  @param info         A pointer to iw_request_info structure
1296  *  @param vwrq         A pointer to iw_param structure
1297  *  @param extra        A pointer to extra data buf
1298  *
1299  *  @return             0 --success, otherwise fail
1300  */
1301 int lbs_set_scan(struct net_device *dev, struct iw_request_info *info,
1302                   struct iw_param *vwrq, char *extra)
1303 {
1304         struct lbs_private *priv = dev->priv;
1305         struct lbs_adapter *adapter = priv->adapter;
1306
1307         lbs_deb_enter(LBS_DEB_SCAN);
1308
1309         if (!delayed_work_pending(&priv->scan_work)) {
1310                 queue_delayed_work(priv->work_thread, &priv->scan_work,
1311                                    msecs_to_jiffies(50));
1312         }
1313
1314         if (adapter->surpriseremoved)
1315                 return -1;
1316
1317         lbs_deb_leave(LBS_DEB_SCAN);
1318         return 0;
1319 }
1320
1321
1322 /**
1323  *  @brief Send a scan command for all available channels filtered on a spec
1324  *
1325  *  Used in association code and from debugfs
1326  *
1327  *  @param priv             A pointer to struct lbs_private structure
1328  *  @param ssid             A pointer to the SSID to scan for
1329  *  @param ssid_len         Length of the SSID
1330  *  @param clear_ssid       Should existing scan results with this SSID
1331  *                          be cleared?
1332  *  @param prequestedssid   A pointer to AP's ssid
1333  *  @param keeppreviousscan Flag used to save/clear scan table before scan
1334  *
1335  *  @return                0-success, otherwise fail
1336  */
1337 int lbs_send_specific_ssid_scan(struct lbs_private *priv,
1338                         u8 *ssid, u8 ssid_len, u8 clear_ssid)
1339 {
1340         struct lbs_adapter *adapter = priv->adapter;
1341         struct lbs_ioctl_user_scan_cfg scancfg;
1342         int ret = 0;
1343
1344         lbs_deb_enter_args(LBS_DEB_SCAN, "SSID '%s', clear %d",
1345                 escape_essid(ssid, ssid_len), clear_ssid);
1346
1347         if (!ssid_len)
1348                 goto out;
1349
1350         memset(&scancfg, 0x00, sizeof(scancfg));
1351         memcpy(scancfg.ssid, ssid, ssid_len);
1352         scancfg.ssid_len = ssid_len;
1353         scancfg.clear_ssid = clear_ssid;
1354
1355         lbs_scan_networks(priv, &scancfg, 1);
1356         if (adapter->surpriseremoved) {
1357                 ret = -1;
1358                 goto out;
1359         }
1360         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1361
1362 out:
1363         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1364         return ret;
1365 }
1366
1367
1368
1369
1370 /*********************************************************************/
1371 /*                                                                   */
1372 /*  Support for Wireless Extensions                                  */
1373 /*                                                                   */
1374 /*********************************************************************/
1375
1376 #define MAX_CUSTOM_LEN 64
1377
1378 static inline char *lbs_translate_scan(struct lbs_private *priv,
1379                                         char *start, char *stop,
1380                                         struct bss_descriptor *bss)
1381 {
1382         struct lbs_adapter *adapter = priv->adapter;
1383         struct chan_freq_power *cfp;
1384         char *current_val;      /* For rates */
1385         struct iw_event iwe;    /* Temporary buffer */
1386         int j;
1387 #define PERFECT_RSSI ((u8)50)
1388 #define WORST_RSSI   ((u8)0)
1389 #define RSSI_DIFF    ((u8)(PERFECT_RSSI - WORST_RSSI))
1390         u8 rssi;
1391
1392         lbs_deb_enter(LBS_DEB_SCAN);
1393
1394         cfp = lbs_find_cfp_by_band_and_channel(adapter, 0, bss->channel);
1395         if (!cfp) {
1396                 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1397                 start = NULL;
1398                 goto out;
1399         }
1400
1401         /* First entry *MUST* be the AP BSSID */
1402         iwe.cmd = SIOCGIWAP;
1403         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1404         memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1405         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1406
1407         /* SSID */
1408         iwe.cmd = SIOCGIWESSID;
1409         iwe.u.data.flags = 1;
1410         iwe.u.data.length = min((u32) bss->ssid_len, (u32) IW_ESSID_MAX_SIZE);
1411         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1412
1413         /* Mode */
1414         iwe.cmd = SIOCGIWMODE;
1415         iwe.u.mode = bss->mode;
1416         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1417
1418         /* Frequency */
1419         iwe.cmd = SIOCGIWFREQ;
1420         iwe.u.freq.m = (long)cfp->freq * 100000;
1421         iwe.u.freq.e = 1;
1422         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1423
1424         /* Add quality statistics */
1425         iwe.cmd = IWEVQUAL;
1426         iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1427         iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1428
1429         rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1430         iwe.u.qual.qual =
1431             (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1432              (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1433             (RSSI_DIFF * RSSI_DIFF);
1434         if (iwe.u.qual.qual > 100)
1435                 iwe.u.qual.qual = 100;
1436
1437         if (adapter->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1438                 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1439         } else {
1440                 iwe.u.qual.noise =
1441                     CAL_NF(adapter->NF[TYPE_BEACON][TYPE_NOAVG]);
1442         }
1443
1444         /* Locally created ad-hoc BSSs won't have beacons if this is the
1445          * only station in the adhoc network; so get signal strength
1446          * from receive statistics.
1447          */
1448         if ((adapter->mode == IW_MODE_ADHOC)
1449             && adapter->adhoccreate
1450             && !lbs_ssid_cmp(adapter->curbssparams.ssid,
1451                                   adapter->curbssparams.ssid_len,
1452                                   bss->ssid, bss->ssid_len)) {
1453                 int snr, nf;
1454                 snr = adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1455                 nf = adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1456                 iwe.u.qual.level = CAL_RSSI(snr, nf);
1457         }
1458         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
1459
1460         /* Add encryption capability */
1461         iwe.cmd = SIOCGIWENCODE;
1462         if (bss->capability & WLAN_CAPABILITY_PRIVACY) {
1463                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1464         } else {
1465                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1466         }
1467         iwe.u.data.length = 0;
1468         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1469
1470         current_val = start + IW_EV_LCP_LEN;
1471
1472         iwe.cmd = SIOCGIWRATE;
1473         iwe.u.bitrate.fixed = 0;
1474         iwe.u.bitrate.disabled = 0;
1475         iwe.u.bitrate.value = 0;
1476
1477         for (j = 0; bss->rates[j] && (j < sizeof(bss->rates)); j++) {
1478                 /* Bit rate given in 500 kb/s units */
1479                 iwe.u.bitrate.value = bss->rates[j] * 500000;
1480                 current_val = iwe_stream_add_value(start, current_val,
1481                                          stop, &iwe, IW_EV_PARAM_LEN);
1482         }
1483         if ((bss->mode == IW_MODE_ADHOC)
1484             && !lbs_ssid_cmp(adapter->curbssparams.ssid,
1485                                   adapter->curbssparams.ssid_len,
1486                                   bss->ssid, bss->ssid_len)
1487             && adapter->adhoccreate) {
1488                 iwe.u.bitrate.value = 22 * 500000;
1489                 current_val = iwe_stream_add_value(start, current_val,
1490                                          stop, &iwe, IW_EV_PARAM_LEN);
1491         }
1492         /* Check if we added any event */
1493         if((current_val - start) > IW_EV_LCP_LEN)
1494                 start = current_val;
1495
1496         memset(&iwe, 0, sizeof(iwe));
1497         if (bss->wpa_ie_len) {
1498                 char buf[MAX_WPA_IE_LEN];
1499                 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1500                 iwe.cmd = IWEVGENIE;
1501                 iwe.u.data.length = bss->wpa_ie_len;
1502                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1503         }
1504
1505         memset(&iwe, 0, sizeof(iwe));
1506         if (bss->rsn_ie_len) {
1507                 char buf[MAX_WPA_IE_LEN];
1508                 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1509                 iwe.cmd = IWEVGENIE;
1510                 iwe.u.data.length = bss->rsn_ie_len;
1511                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1512         }
1513
1514         if (bss->mesh) {
1515                 char custom[MAX_CUSTOM_LEN];
1516                 char *p = custom;
1517
1518                 iwe.cmd = IWEVCUSTOM;
1519                 p += snprintf(p, MAX_CUSTOM_LEN - (p - custom),
1520                               "mesh-type: olpc");
1521                 iwe.u.data.length = p - custom;
1522                 if (iwe.u.data.length)
1523                         start = iwe_stream_add_point(start, stop, &iwe, custom);
1524         }
1525
1526 out:
1527         lbs_deb_leave_args(LBS_DEB_SCAN, "start %p", start);
1528         return start;
1529 }
1530
1531 /**
1532  *  @brief  Handle Retrieve scan table ioctl
1533  *
1534  *  @param dev          A pointer to net_device structure
1535  *  @param info         A pointer to iw_request_info structure
1536  *  @param dwrq         A pointer to iw_point structure
1537  *  @param extra        A pointer to extra data buf
1538  *
1539  *  @return             0 --success, otherwise fail
1540  */
1541 int lbs_get_scan(struct net_device *dev, struct iw_request_info *info,
1542                   struct iw_point *dwrq, char *extra)
1543 {
1544 #define SCAN_ITEM_SIZE 128
1545         struct lbs_private *priv = dev->priv;
1546         struct lbs_adapter *adapter = priv->adapter;
1547         int err = 0;
1548         char *ev = extra;
1549         char *stop = ev + dwrq->length;
1550         struct bss_descriptor * iter_bss;
1551         struct bss_descriptor * safe;
1552
1553         lbs_deb_enter(LBS_DEB_SCAN);
1554
1555         /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1556         if ((adapter->mode == IW_MODE_ADHOC) && adapter->adhoccreate) {
1557                 lbs_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
1558                                         CMD_OPTION_WAITFORRSP, 0, NULL);
1559         }
1560
1561         mutex_lock(&adapter->lock);
1562         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1563                 char * next_ev;
1564                 unsigned long stale_time;
1565
1566                 if (stop - ev < SCAN_ITEM_SIZE) {
1567                         err = -E2BIG;
1568                         break;
1569                 }
1570
1571                 /* For mesh device, list only mesh networks */
1572                 if (dev == priv->mesh_dev && !iter_bss->mesh)
1573                         continue;
1574
1575                 /* Prune old an old scan result */
1576                 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1577                 if (time_after(jiffies, stale_time)) {
1578                         list_move_tail (&iter_bss->list,
1579                                         &adapter->network_free_list);
1580                         clear_bss_descriptor(iter_bss);
1581                         continue;
1582                 }
1583
1584                 /* Translate to WE format this entry */
1585                 next_ev = lbs_translate_scan(priv, ev, stop, iter_bss);
1586                 if (next_ev == NULL)
1587                         continue;
1588                 ev = next_ev;
1589         }
1590         mutex_unlock(&adapter->lock);
1591
1592         dwrq->length = (ev - extra);
1593         dwrq->flags = 0;
1594
1595         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", err);
1596         return err;
1597 }
1598
1599
1600
1601
1602 /*********************************************************************/
1603 /*                                                                   */
1604 /*  Command execution                                                */
1605 /*                                                                   */
1606 /*********************************************************************/
1607
1608
1609 /**
1610  *  @brief Prepare a scan command to be sent to the firmware
1611  *
1612  *  Called from lbs_prepare_and_send_command() in cmd.c
1613  *
1614  *  Sends a fixed lenght data part (specifying the BSS type and BSSID filters)
1615  *  as well as a variable number/length of TLVs to the firmware.
1616  *
1617  *  @param priv       A pointer to struct lbs_private structure
1618  *  @param cmd        A pointer to cmd_ds_command structure to be sent to
1619  *                    firmware with the cmd_DS_801_11_SCAN structure
1620  *  @param pdata_buf  Void pointer cast of a lbs_scan_cmd_config struct used
1621  *                    to set the fields/TLVs for the command sent to firmware
1622  *
1623  *  @return           0 or -1
1624  */
1625 int lbs_cmd_80211_scan(struct lbs_private *priv,
1626                          struct cmd_ds_command *cmd, void *pdata_buf)
1627 {
1628         struct cmd_ds_802_11_scan *pscan = &cmd->params.scan;
1629         struct lbs_scan_cmd_config *pscancfg = pdata_buf;
1630
1631         lbs_deb_enter(LBS_DEB_SCAN);
1632
1633         /* Set fixed field variables in scan command */
1634         pscan->bsstype = pscancfg->bsstype;
1635         memcpy(pscan->bssid, pscancfg->bssid, ETH_ALEN);
1636         memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen);
1637
1638         cmd->command = cpu_to_le16(CMD_802_11_SCAN);
1639
1640         /* size is equal to the sizeof(fixed portions) + the TLV len + header */
1641         cmd->size = cpu_to_le16(sizeof(pscan->bsstype) + ETH_ALEN
1642                                 + pscancfg->tlvbufferlen + S_DS_GEN);
1643
1644         lbs_deb_scan("SCAN_CMD: command 0x%04x, size %d, seqnum %d\n",
1645                      le16_to_cpu(cmd->command), le16_to_cpu(cmd->size),
1646                      le16_to_cpu(cmd->seqnum));
1647
1648         lbs_deb_leave(LBS_DEB_SCAN);
1649         return 0;
1650 }
1651
1652 static inline int is_same_network(struct bss_descriptor *src,
1653                                   struct bss_descriptor *dst)
1654 {
1655         /* A network is only a duplicate if the channel, BSSID, and ESSID
1656          * all match.  We treat all <hidden> with the same BSSID and channel
1657          * as one network */
1658         return ((src->ssid_len == dst->ssid_len) &&
1659                 (src->channel == dst->channel) &&
1660                 !compare_ether_addr(src->bssid, dst->bssid) &&
1661                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1662 }
1663
1664 /**
1665  *  @brief This function handles the command response of scan
1666  *
1667  *  Called from handle_cmd_response() in cmdrespc.
1668  *
1669  *   The response buffer for the scan command has the following
1670  *      memory layout:
1671  *
1672  *     .-----------------------------------------------------------.
1673  *     |  header (4 * sizeof(u16)):  Standard command response hdr |
1674  *     .-----------------------------------------------------------.
1675  *     |  bufsize (u16) : sizeof the BSS Description data          |
1676  *     .-----------------------------------------------------------.
1677  *     |  NumOfSet (u8) : Number of BSS Descs returned             |
1678  *     .-----------------------------------------------------------.
1679  *     |  BSSDescription data (variable, size given in bufsize)    |
1680  *     .-----------------------------------------------------------.
1681  *     |  TLV data (variable, size calculated using header->size,  |
1682  *     |            bufsize and sizeof the fixed fields above)     |
1683  *     .-----------------------------------------------------------.
1684  *
1685  *  @param priv    A pointer to struct lbs_private structure
1686  *  @param resp    A pointer to cmd_ds_command
1687  *
1688  *  @return        0 or -1
1689  */
1690 int lbs_ret_80211_scan(struct lbs_private *priv, struct cmd_ds_command *resp)
1691 {
1692         struct lbs_adapter *adapter = priv->adapter;
1693         struct cmd_ds_802_11_scan_rsp *pscan;
1694         struct bss_descriptor * iter_bss;
1695         struct bss_descriptor * safe;
1696         u8 *pbssinfo;
1697         u16 scanrespsize;
1698         int bytesleft;
1699         int idx;
1700         int tlvbufsize;
1701         int ret;
1702
1703         lbs_deb_enter(LBS_DEB_SCAN);
1704
1705         /* Prune old entries from scan table */
1706         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1707                 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1708                 if (time_before(jiffies, stale_time))
1709                         continue;
1710                 list_move_tail (&iter_bss->list, &adapter->network_free_list);
1711                 clear_bss_descriptor(iter_bss);
1712         }
1713
1714         pscan = &resp->params.scanresp;
1715
1716         if (pscan->nr_sets > MAX_NETWORK_COUNT) {
1717                 lbs_deb_scan(
1718                        "SCAN_RESP: too many scan results (%d, max %d)!!\n",
1719                        pscan->nr_sets, MAX_NETWORK_COUNT);
1720                 ret = -1;
1721                 goto done;
1722         }
1723
1724         bytesleft = le16_to_cpu(get_unaligned((u16*)&pscan->bssdescriptsize));
1725         lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1726
1727         scanrespsize = le16_to_cpu(get_unaligned((u16*)&resp->size));
1728         lbs_deb_scan("SCAN_RESP: returned %d AP before parsing\n",
1729                pscan->nr_sets);
1730
1731         pbssinfo = pscan->bssdesc_and_tlvbuffer;
1732
1733         /* The size of the TLV buffer is equal to the entire command response
1734          *   size (scanrespsize) minus the fixed fields (sizeof()'s), the
1735          *   BSS Descriptions (bssdescriptsize as bytesLef) and the command
1736          *   response header (S_DS_GEN)
1737          */
1738         tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize)
1739                                      + sizeof(pscan->nr_sets)
1740                                      + S_DS_GEN);
1741
1742         /*
1743          *  Process each scan response returned (pscan->nr_sets).  Save
1744          *    the information in the newbssentry and then insert into the
1745          *    driver scan table either as an update to an existing entry
1746          *    or as an addition at the end of the table
1747          */
1748         for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) {
1749                 struct bss_descriptor new;
1750                 struct bss_descriptor * found = NULL;
1751                 struct bss_descriptor * oldest = NULL;
1752                 DECLARE_MAC_BUF(mac);
1753
1754                 /* Process the data fields and IEs returned for this BSS */
1755                 memset(&new, 0, sizeof (struct bss_descriptor));
1756                 if (lbs_process_bss(&new, &pbssinfo, &bytesleft) != 0) {
1757                         /* error parsing the scan response, skipped */
1758                         lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1759                         continue;
1760                 }
1761
1762                 /* Try to find this bss in the scan table */
1763                 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1764                         if (is_same_network(iter_bss, &new)) {
1765                                 found = iter_bss;
1766                                 break;
1767                         }
1768
1769                         if ((oldest == NULL) ||
1770                             (iter_bss->last_scanned < oldest->last_scanned))
1771                                 oldest = iter_bss;
1772                 }
1773
1774                 if (found) {
1775                         /* found, clear it */
1776                         clear_bss_descriptor(found);
1777                 } else if (!list_empty(&adapter->network_free_list)) {
1778                         /* Pull one from the free list */
1779                         found = list_entry(adapter->network_free_list.next,
1780                                            struct bss_descriptor, list);
1781                         list_move_tail(&found->list, &adapter->network_list);
1782                 } else if (oldest) {
1783                         /* If there are no more slots, expire the oldest */
1784                         found = oldest;
1785                         clear_bss_descriptor(found);
1786                         list_move_tail(&found->list, &adapter->network_list);
1787                 } else {
1788                         continue;
1789                 }
1790
1791                 lbs_deb_scan("SCAN_RESP: BSSID = %s\n",
1792                              print_mac(mac, new.bssid));
1793
1794                 /* Copy the locally created newbssentry to the scan table */
1795                 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1796         }
1797
1798         ret = 0;
1799
1800 done:
1801         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1802         return ret;
1803 }