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 #include "join.h"
  21
  22 //! Approximate amount of data needed to pass a scan result back to iwlist
  23 #define MAX_SCAN_CELL_SIZE  (IW_EV_ADDR_LEN             \
  24                              + IW_ESSID_MAX_SIZE        \
  25                              + IW_EV_UINT_LEN           \
  26                              + IW_EV_FREQ_LEN           \
  27                              + IW_EV_QUAL_LEN           \
  28                              + IW_ESSID_MAX_SIZE        \
  29                              + IW_EV_PARAM_LEN          \
  30                              + 40)      /* 40 for WPAIE */
  31
  32 //! Memory needed to store a max sized channel List TLV for a firmware scan
  33 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mrvlietypesheader)    \
  34                             + (MRVDRV_MAX_CHANNELS_PER_SCAN     \
  35                                * sizeof(struct chanscanparamset)))
  36
  37 //! Memory needed to store a max number/size SSID TLV for a firmware scan
  38 #define SSID_TLV_MAX_SIZE  (1 * sizeof(struct mrvlietypes_ssidparamset))
  39
  40 //! Maximum memory needed for a wlan_scan_cmd_config with all TLVs at max
  41 #define MAX_SCAN_CFG_ALLOC (sizeof(struct wlan_scan_cmd_config)  \
  42                             + sizeof(struct mrvlietypes_numprobes)   \
  43                             + CHAN_TLV_MAX_SIZE                 \
  44                             + SSID_TLV_MAX_SIZE)
  45
  46 //! The maximum number of channels the firmware can scan per command
  47 #define MRVDRV_MAX_CHANNELS_PER_SCAN   14
  48
  49 /**
  50  * @brief Number of channels to scan per firmware scan command issuance.
  51  *
  52  *  Number restricted to prevent hitting the limit on the amount of scan data
  53  *  returned in a single firmware scan command.
  54  */
  55 #define MRVDRV_CHANNELS_PER_SCAN_CMD   4
  56
  57 //! Scan time specified in the channel TLV for each channel for passive scans
  58 #define MRVDRV_PASSIVE_SCAN_CHAN_TIME  100
  59
  60 //! Scan time specified in the channel TLV for each channel for active scans
  61 #define MRVDRV_ACTIVE_SCAN_CHAN_TIME   100
  62
  63 static const u8 zeromac[ETH_ALEN] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
  64 static const u8 bcastmac[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  65
  66 static inline void clear_bss_descriptor (struct bss_descriptor * bss)
  67 {
  68         /* Don't blow away ->list, just BSS data */
  69         memset(bss, 0, offsetof(struct bss_descriptor, list));
  70 }
  71
  72 static inline int match_bss_no_security(struct wlan_802_11_security * secinfo,
  73                         struct bss_descriptor * match_bss)
  74 {
  75         if (   !secinfo->wep_enabled
  76             && !secinfo->WPAenabled
  77             && !secinfo->WPA2enabled
  78             && match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC
  79             && match_bss->rsn_ie[0] != MFIE_TYPE_RSN
  80             && !(match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
  81                 return 1;
  82         }
  83         return 0;
  84 }
  85
  86 static inline int match_bss_static_wep(struct wlan_802_11_security * secinfo,
  87                         struct bss_descriptor * match_bss)
  88 {
  89         if ( secinfo->wep_enabled
  90            && !secinfo->WPAenabled
  91            && !secinfo->WPA2enabled
  92            && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
  93                 return 1;
  94         }
  95         return 0;
  96 }
  97
  98 static inline int match_bss_wpa(struct wlan_802_11_security * secinfo,
  99                         struct bss_descriptor * match_bss)
 100 {
 101         if (  !secinfo->wep_enabled
 102            && secinfo->WPAenabled
 103            && (match_bss->wpa_ie[0] == MFIE_TYPE_GENERIC)
 104            /* privacy bit may NOT be set in some APs like LinkSys WRT54G
 105               && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 106             */
 107            ) {
 108                 return 1;
 109         }
 110         return 0;
 111 }
 112
 113 static inline int match_bss_wpa2(struct wlan_802_11_security * secinfo,
 114                         struct bss_descriptor * match_bss)
 115 {
 116         if (  !secinfo->wep_enabled
 117            && secinfo->WPA2enabled
 118            && (match_bss->rsn_ie[0] == MFIE_TYPE_RSN)
 119            /* privacy bit may NOT be set in some APs like LinkSys WRT54G
 120               && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 121             */
 122            ) {
 123                 return 1;
 124         }
 125         return 0;
 126 }
 127
 128 static inline int match_bss_dynamic_wep(struct wlan_802_11_security * secinfo,
 129                         struct bss_descriptor * match_bss)
 130 {
 131         if (  !secinfo->wep_enabled
 132            && !secinfo->WPAenabled
 133            && !secinfo->WPA2enabled
 134            && (match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC)
 135            && (match_bss->rsn_ie[0] != MFIE_TYPE_RSN)
 136            && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 137                 return 1;
 138         }
 139         return 0;
 140 }
 141
 142 /**
 143  *  @brief Check if a scanned network compatible with the driver settings
 144  *
 145  *   WEP     WPA     WPA2    ad-hoc  encrypt                      Network
 146  * enabled enabled  enabled   AES     mode   privacy  WPA  WPA2  Compatible
 147  *    0       0        0       0      NONE      0      0    0   yes No security
 148  *    1       0        0       0      NONE      1      0    0   yes Static WEP
 149  *    0       1        0       0       x        1x     1    x   yes WPA
 150  *    0       0        1       0       x        1x     x    1   yes WPA2
 151  *    0       0        0       1      NONE      1      0    0   yes Ad-hoc AES
 152  *    0       0        0       0     !=NONE     1      0    0   yes Dynamic WEP
 153  *
 154  *
 155  *  @param adapter A pointer to wlan_adapter
 156  *  @param index   Index in scantable to check against current driver settings
 157  *  @param mode    Network mode: Infrastructure or IBSS
 158  *
 159  *  @return        Index in scantable, or error code if negative
 160  */
 161 static int is_network_compatible(wlan_adapter * adapter,
 162                 struct bss_descriptor * bss, u8 mode)
 163 {
 164         int matched = 0;
 165
 166         lbs_deb_enter(LBS_DEB_ASSOC);
 167
 168         if (bss->mode != mode)
 169                 goto done;
 170
 171         if ((matched = match_bss_no_security(&adapter->secinfo, bss))) {
 172                 goto done;
 173         } else if ((matched = match_bss_static_wep(&adapter->secinfo, bss))) {
 174                 goto done;
 175         } else if ((matched = match_bss_wpa(&adapter->secinfo, bss))) {
 176                 lbs_deb_scan(
 177                        "is_network_compatible() WPA: wpa_ie=%#x "
 178                        "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 179                        "privacy=%#x\n", bss->wpa_ie[0], bss->rsn_ie[0],
 180                        adapter->secinfo.wep_enabled ? "e" : "d",
 181                        adapter->secinfo.WPAenabled ? "e" : "d",
 182                        adapter->secinfo.WPA2enabled ? "e" : "d",
 183                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
 184                 goto done;
 185         } else if ((matched = match_bss_wpa2(&adapter->secinfo, bss))) {
 186                 lbs_deb_scan(
 187                        "is_network_compatible() WPA2: 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_dynamic_wep(&adapter->secinfo, bss))) {
 196                 lbs_deb_scan(
 197                        "is_network_compatible() dynamic WEP: "
 198                        "wpa_ie=%#x wpa2_ie=%#x privacy=%#x\n",
 199                        bss->wpa_ie[0], bss->rsn_ie[0],
 200                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
 201                 goto done;
 202         }
 203
 204         /* bss security settings don't match those configured on card */
 205         lbs_deb_scan(
 206                "is_network_compatible() FAILED: wpa_ie=%#x "
 207                "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s privacy=%#x\n",
 208                bss->wpa_ie[0], bss->rsn_ie[0],
 209                adapter->secinfo.wep_enabled ? "e" : "d",
 210                adapter->secinfo.WPAenabled ? "e" : "d",
 211                adapter->secinfo.WPA2enabled ? "e" : "d",
 212                (bss->capability & WLAN_CAPABILITY_PRIVACY));
 213
 214 done:
 215         lbs_deb_leave(LBS_DEB_SCAN);
 216         return matched;
 217 }
 218
 219 /**
 220  *  @brief Create a channel list for the driver to scan based on region info
 221  *
 222  *  Use the driver region/band information to construct a comprehensive list
 223  *    of channels to scan.  This routine is used for any scan that is not
 224  *    provided a specific channel list to scan.
 225  *
 226  *  @param priv          A pointer to wlan_private structure
 227  *  @param scanchanlist  Output parameter: resulting channel list to scan
 228  *  @param filteredscan  Flag indicating whether or not a BSSID or SSID filter
 229  *                       is being sent in the command to firmware.  Used to
 230  *                       increase the number of channels sent in a scan
 231  *                       command and to disable the firmware channel scan
 232  *                       filter.
 233  *
 234  *  @return              void
 235  */
 236 static void wlan_scan_create_channel_list(wlan_private * priv,
 237                                           struct chanscanparamset * scanchanlist,
 238                                           u8 filteredscan)
 239 {
 240
 241         wlan_adapter *adapter = priv->adapter;
 242         struct region_channel *scanregion;
 243         struct chan_freq_power *cfp;
 244         int rgnidx;
 245         int chanidx;
 246         int nextchan;
 247         u8 scantype;
 248
 249         chanidx = 0;
 250
 251         /* Set the default scan type to the user specified type, will later
 252          *   be changed to passive on a per channel basis if restricted by
 253          *   regulatory requirements (11d or 11h)
 254          */
 255         scantype = CMD_SCAN_TYPE_ACTIVE;
 256
 257         for (rgnidx = 0; rgnidx < ARRAY_SIZE(adapter->region_channel); rgnidx++) {
 258                 if (priv->adapter->enable11d &&
 259                     adapter->connect_status != LIBERTAS_CONNECTED) {
 260                         /* Scan all the supported chan for the first scan */
 261                         if (!adapter->universal_channel[rgnidx].valid)
 262                                 continue;
 263                         scanregion = &adapter->universal_channel[rgnidx];
 264
 265                         /* clear the parsed_region_chan for the first scan */
 266                         memset(&adapter->parsed_region_chan, 0x00,
 267                                sizeof(adapter->parsed_region_chan));
 268                 } else {
 269                         if (!adapter->region_channel[rgnidx].valid)
 270                                 continue;
 271                         scanregion = &adapter->region_channel[rgnidx];
 272                 }
 273
 274                 for (nextchan = 0;
 275                      nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
 276
 277                         cfp = scanregion->CFP + nextchan;
 278
 279                         if (priv->adapter->enable11d) {
 280                                 scantype =
 281                                     libertas_get_scan_type_11d(cfp->channel,
 282                                                            &adapter->
 283                                                            parsed_region_chan);
 284                         }
 285
 286                         switch (scanregion->band) {
 287                         case BAND_B:
 288                         case BAND_G:
 289                         default:
 290                                 scanchanlist[chanidx].radiotype =
 291                                     CMD_SCAN_RADIO_TYPE_BG;
 292                                 break;
 293                         }
 294
 295                         if (scantype == CMD_SCAN_TYPE_PASSIVE) {
 296                                 scanchanlist[chanidx].maxscantime =
 297                                     cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
 298                                 scanchanlist[chanidx].chanscanmode.passivescan =
 299                                     1;
 300                         } else {
 301                                 scanchanlist[chanidx].maxscantime =
 302                                     cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
 303                                 scanchanlist[chanidx].chanscanmode.passivescan =
 304                                     0;
 305                         }
 306
 307                         scanchanlist[chanidx].channumber = cfp->channel;
 308
 309                         if (filteredscan) {
 310                                 scanchanlist[chanidx].chanscanmode.
 311                                     disablechanfilt = 1;
 312                         }
 313                 }
 314         }
 315 }
 316
 317
 318 /* Delayed partial scan worker */
 319 void libertas_scan_worker(struct work_struct *work)
 320 {
 321         wlan_private *priv = container_of(work, wlan_private, scan_work.work);
 322
 323         wlan_scan_networks(priv, NULL, 0);
 324 }
 325
 326
 327 /**
 328  *  @brief Construct a wlan_scan_cmd_config structure to use in issue scan cmds
 329  *
 330  *  Application layer or other functions can invoke wlan_scan_networks
 331  *    with a scan configuration supplied in a wlan_ioctl_user_scan_cfg struct.
 332  *    This structure is used as the basis of one or many wlan_scan_cmd_config
 333  *    commands that are sent to the command processing module and sent to
 334  *    firmware.
 335  *
 336  *  Create a wlan_scan_cmd_config based on the following user supplied
 337  *    parameters (if present):
 338  *             - SSID filter
 339  *             - BSSID filter
 340  *             - Number of Probes to be sent
 341  *             - channel list
 342  *
 343  *  If the SSID or BSSID filter is not present, disable/clear the filter.
 344  *  If the number of probes is not set, use the adapter default setting
 345  *  Qualify the channel
 346  *
 347  *  @param priv             A pointer to wlan_private structure
 348  *  @param puserscanin      NULL or pointer to scan configuration parameters
 349  *  @param ppchantlvout     Output parameter: Pointer to the start of the
 350  *                          channel TLV portion of the output scan config
 351  *  @param pscanchanlist    Output parameter: Pointer to the resulting channel
 352  *                          list to scan
 353  *  @param pmaxchanperscan  Output parameter: Number of channels to scan for
 354  *                          each issuance of the firmware scan command
 355  *  @param pfilteredscan    Output parameter: Flag indicating whether or not
 356  *                          a BSSID or SSID filter is being sent in the
 357  *                          command to firmware.  Used to increase the number
 358  *                          of channels sent in a scan command and to
 359  *                          disable the firmware channel scan filter.
 360  *  @param pscancurrentonly Output parameter: Flag indicating whether or not
 361  *                          we are only scanning our current active channel
 362  *
 363  *  @return                 resulting scan configuration
 364  */
 365 static struct wlan_scan_cmd_config *
 366 wlan_scan_setup_scan_config(wlan_private * priv,
 367                             const struct wlan_ioctl_user_scan_cfg * puserscanin,
 368                             struct mrvlietypes_chanlistparamset ** ppchantlvout,
 369                             struct chanscanparamset * pscanchanlist,
 370                             int *pmaxchanperscan,
 371                             u8 * pfilteredscan,
 372                             u8 * pscancurrentonly)
 373 {
 374         struct mrvlietypes_numprobes *pnumprobestlv;
 375         struct mrvlietypes_ssidparamset *pssidtlv;
 376         struct wlan_scan_cmd_config * pscancfgout = NULL;
 377         u8 *ptlvpos;
 378         u16 numprobes;
 379         int chanidx;
 380         int scantype;
 381         int scandur;
 382         int channel;
 383         int radiotype;
 384
 385         pscancfgout = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
 386         if (pscancfgout == NULL)
 387                 goto out;
 388
 389         /* The tlvbufferlen is calculated for each scan command.  The TLVs added
 390          *   in this routine will be preserved since the routine that sends
 391          *   the command will append channelTLVs at *ppchantlvout.  The difference
 392          *   between the *ppchantlvout and the tlvbuffer start will be used
 393          *   to calculate the size of anything we add in this routine.
 394          */
 395         pscancfgout->tlvbufferlen = 0;
 396
 397         /* Running tlv pointer.  Assigned to ppchantlvout at end of function
 398          *  so later routines know where channels can be added to the command buf
 399          */
 400         ptlvpos = pscancfgout->tlvbuffer;
 401
 402         /*
 403          * Set the initial scan paramters for progressive scanning.  If a specific
 404          *   BSSID or SSID is used, the number of channels in the scan command
 405          *   will be increased to the absolute maximum
 406          */
 407         *pmaxchanperscan = MRVDRV_CHANNELS_PER_SCAN_CMD;
 408
 409         /* Initialize the scan as un-filtered by firmware, set to TRUE below if
 410          *   a SSID or BSSID filter is sent in the command
 411          */
 412         *pfilteredscan = 0;
 413
 414         /* Initialize the scan as not being only on the current channel.  If
 415          *   the channel list is customized, only contains one channel, and
 416          *   is the active channel, this is set true and data flow is not halted.
 417          */
 418         *pscancurrentonly = 0;
 419
 420         if (puserscanin) {
 421                 /* Set the bss type scan filter, use adapter setting if unset */
 422                 pscancfgout->bsstype =
 423                     puserscanin->bsstype ? puserscanin->bsstype : CMD_BSS_TYPE_ANY;
 424
 425                 /* Set the number of probes to send, use adapter setting if unset */
 426                 numprobes = puserscanin->numprobes ? puserscanin->numprobes : 0;
 427
 428                 /*
 429                  * Set the BSSID filter to the incoming configuration,
 430                  *   if non-zero.  If not set, it will remain disabled (all zeros).
 431                  */
 432                 memcpy(pscancfgout->bssid, puserscanin->bssid,
 433                        sizeof(pscancfgout->bssid));
 434
 435                 if (puserscanin->ssid_len) {
 436                         pssidtlv =
 437                             (struct mrvlietypes_ssidparamset *) pscancfgout->
 438                             tlvbuffer;
 439                         pssidtlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
 440                         pssidtlv->header.len = cpu_to_le16(puserscanin->ssid_len);
 441                         memcpy(pssidtlv->ssid, puserscanin->ssid,
 442                                puserscanin->ssid_len);
 443                         ptlvpos += sizeof(pssidtlv->header) + puserscanin->ssid_len;
 444                 }
 445
 446                 /*
 447                  *  The default number of channels sent in the command is low to
 448                  *    ensure the response buffer from the firmware does not truncate
 449                  *    scan results.  That is not an issue with an SSID or BSSID
 450                  *    filter applied to the scan results in the firmware.
 451                  */
 452                 if (   puserscanin->ssid_len
 453                     || (compare_ether_addr(pscancfgout->bssid, &zeromac[0]) != 0)) {
 454                         *pmaxchanperscan = MRVDRV_MAX_CHANNELS_PER_SCAN;
 455                         *pfilteredscan = 1;
 456                 }
 457         } else {
 458                 pscancfgout->bsstype = CMD_BSS_TYPE_ANY;
 459                 numprobes = 0;
 460         }
 461
 462         /* If the input config or adapter has the number of Probes set, add tlv */
 463         if (numprobes) {
 464                 pnumprobestlv = (struct mrvlietypes_numprobes *) ptlvpos;
 465                 pnumprobestlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 466                 pnumprobestlv->header.len = cpu_to_le16(2);
 467                 pnumprobestlv->numprobes = cpu_to_le16(numprobes);
 468
 469                 ptlvpos += sizeof(*pnumprobestlv);
 470         }
 471
 472         /*
 473          * Set the output for the channel TLV to the address in the tlv buffer
 474          *   past any TLVs that were added in this fuction (SSID, numprobes).
 475          *   channel TLVs will be added past this for each scan command, preserving
 476          *   the TLVs that were previously added.
 477          */
 478         *ppchantlvout = (struct mrvlietypes_chanlistparamset *) ptlvpos;
 479
 480         if (!puserscanin || !puserscanin->chanlist[0].channumber) {
 481                 /* Create a default channel scan list */
 482                 lbs_deb_scan("Scan: Creating full region channel list\n");
 483                 wlan_scan_create_channel_list(priv, pscanchanlist,
 484                                               *pfilteredscan);
 485                 goto out;
 486         }
 487
 488         lbs_deb_scan("Scan: Using supplied channel list\n");
 489         for (chanidx = 0;
 490              chanidx < WLAN_IOCTL_USER_SCAN_CHAN_MAX
 491              && puserscanin->chanlist[chanidx].channumber; chanidx++) {
 492
 493                 channel = puserscanin->chanlist[chanidx].channumber;
 494                 (pscanchanlist + chanidx)->channumber = channel;
 495
 496                 radiotype = puserscanin->chanlist[chanidx].radiotype;
 497                 (pscanchanlist + chanidx)->radiotype = radiotype;
 498
 499                 scantype = puserscanin->chanlist[chanidx].scantype;
 500
 501                 if (scantype == CMD_SCAN_TYPE_PASSIVE) {
 502                         (pscanchanlist +
 503                          chanidx)->chanscanmode.passivescan = 1;
 504                 } else {
 505                         (pscanchanlist +
 506                          chanidx)->chanscanmode.passivescan = 0;
 507                 }
 508
 509                 if (puserscanin->chanlist[chanidx].scantime) {
 510                         scandur = puserscanin->chanlist[chanidx].scantime;
 511                 } else {
 512                         if (scantype == CMD_SCAN_TYPE_PASSIVE) {
 513                                 scandur = MRVDRV_PASSIVE_SCAN_CHAN_TIME;
 514                         } else {
 515                                 scandur = MRVDRV_ACTIVE_SCAN_CHAN_TIME;
 516                         }
 517                 }
 518
 519                 (pscanchanlist + chanidx)->minscantime =
 520                     cpu_to_le16(scandur);
 521                 (pscanchanlist + chanidx)->maxscantime =
 522                     cpu_to_le16(scandur);
 523         }
 524
 525         /* Check if we are only scanning the current channel */
 526         if ((chanidx == 1) &&
 527             (puserscanin->chanlist[0].channumber ==
 528                                priv->adapter->curbssparams.channel)) {
 529                 *pscancurrentonly = 1;
 530                 lbs_deb_scan("Scan: Scanning current channel only");
 531         }
 532
 533 out:
 534         return pscancfgout;
 535 }
 536
 537 /**
 538  *  @brief Construct and send multiple scan config commands to the firmware
 539  *
 540  *  Previous routines have created a wlan_scan_cmd_config with any requested
 541  *   TLVs.  This function splits the channel TLV into maxchanperscan lists
 542  *   and sends the portion of the channel TLV along with the other TLVs
 543  *   to the wlan_cmd routines for execution in the firmware.
 544  *
 545  *  @param priv            A pointer to wlan_private structure
 546  *  @param maxchanperscan  Maximum number channels to be included in each
 547  *                         scan command sent to firmware
 548  *  @param filteredscan    Flag indicating whether or not a BSSID or SSID
 549  *                         filter is being used for the firmware command
 550  *                         scan command sent to firmware
 551  *  @param pscancfgout     Scan configuration used for this scan.
 552  *  @param pchantlvout     Pointer in the pscancfgout where the channel TLV
 553  *                         should start.  This is past any other TLVs that
 554  *                         must be sent down in each firmware command.
 555  *  @param pscanchanlist   List of channels to scan in maxchanperscan segments
 556  *
 557  *  @return                0 or error return otherwise
 558  */
 559 static int wlan_scan_channel_list(wlan_private * priv,
 560                                   int maxchanperscan,
 561                                   u8 filteredscan,
 562                                   struct wlan_scan_cmd_config * pscancfgout,
 563                                   struct mrvlietypes_chanlistparamset * pchantlvout,
 564                                   struct chanscanparamset * pscanchanlist,
 565                                   const struct wlan_ioctl_user_scan_cfg * puserscanin,
 566                                   int full_scan)
 567 {
 568         struct chanscanparamset *ptmpchan;
 569         struct chanscanparamset *pstartchan;
 570         u8 scanband;
 571         int doneearly;
 572         int tlvidx;
 573         int ret = 0;
 574         int scanned = 0;
 575         union iwreq_data wrqu;
 576
 577         lbs_deb_enter(LBS_DEB_ASSOC);
 578
 579         if (pscancfgout == 0 || pchantlvout == 0 || pscanchanlist == 0) {
 580                 lbs_deb_scan("Scan: Null detect: %p, %p, %p\n",
 581                        pscancfgout, pchantlvout, pscanchanlist);
 582                 return -1;
 583         }
 584
 585         pchantlvout->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 586
 587         /* Set the temp channel struct pointer to the start of the desired list */
 588         ptmpchan = pscanchanlist;
 589
 590         if (priv->adapter->last_scanned_channel && !puserscanin)
 591                 ptmpchan += priv->adapter->last_scanned_channel;
 592
 593         /* Loop through the desired channel list, sending a new firmware scan
 594          *   commands for each maxchanperscan channels (or for 1,6,11 individually
 595          *   if configured accordingly)
 596          */
 597         while (ptmpchan->channumber) {
 598
 599                 tlvidx = 0;
 600                 pchantlvout->header.len = 0;
 601                 scanband = ptmpchan->radiotype;
 602                 pstartchan = ptmpchan;
 603                 doneearly = 0;
 604
 605                 /* Construct the channel TLV for the scan command.  Continue to
 606                  *  insert channel TLVs until:
 607                  *    - the tlvidx hits the maximum configured per scan command
 608                  *    - the next channel to insert is 0 (end of desired channel list)
 609                  *    - doneearly is set (controlling individual scanning of 1,6,11)
 610                  */
 611                 while (tlvidx < maxchanperscan && ptmpchan->channumber
 612                        && !doneearly && scanned < 2) {
 613
 614                         lbs_deb_scan("Scan: Chan(%3d), Radio(%d), mode(%d,%d), "
 615                                      "Dur(%d)\n",
 616                                      ptmpchan->channumber, ptmpchan->radiotype,
 617                                      ptmpchan->chanscanmode.passivescan,
 618                                      ptmpchan->chanscanmode.disablechanfilt,
 619                                      ptmpchan->maxscantime);
 620
 621                         /* Copy the current channel TLV to the command being prepared */
 622                         memcpy(pchantlvout->chanscanparam + tlvidx,
 623                                ptmpchan, sizeof(pchantlvout->chanscanparam));
 624
 625                         /* Increment the TLV header length by the size appended */
 626                         /* Ew, it would be _so_ nice if we could just declare the
 627                            variable little-endian and let GCC handle it for us */
 628                         pchantlvout->header.len =
 629                                 cpu_to_le16(le16_to_cpu(pchantlvout->header.len) +
 630                                             sizeof(pchantlvout->chanscanparam));
 631
 632                         /*
 633                          *  The tlv buffer length is set to the number of bytes of the
 634                          *    between the channel tlv pointer and the start of the
 635                          *    tlv buffer.  This compensates for any TLVs that were appended
 636                          *    before the channel list.
 637                          */
 638                         pscancfgout->tlvbufferlen = ((u8 *) pchantlvout
 639                                                      - pscancfgout->tlvbuffer);
 640
 641                         /*  Add the size of the channel tlv header and the data length */
 642                         pscancfgout->tlvbufferlen +=
 643                             (sizeof(pchantlvout->header)
 644                              + le16_to_cpu(pchantlvout->header.len));
 645
 646                         /* Increment the index to the channel tlv we are constructing */
 647                         tlvidx++;
 648
 649                         doneearly = 0;
 650
 651                         /* Stop the loop if the *current* channel is in the 1,6,11 set
 652                          *   and we are not filtering on a BSSID or SSID.
 653                          */
 654                         if (!filteredscan && (ptmpchan->channumber == 1
 655                                               || ptmpchan->channumber == 6
 656                                               || ptmpchan->channumber == 11)) {
 657                                 doneearly = 1;
 658                         }
 659
 660                         /* Increment the tmp pointer to the next channel to be scanned */
 661                         ptmpchan++;
 662                         scanned++;
 663
 664                         /* Stop the loop if the *next* channel is in the 1,6,11 set.
 665                          *  This will cause it to be the only channel scanned on the next
 666                          *  interation
 667                          */
 668                         if (!filteredscan && (ptmpchan->channumber == 1
 669                                               || ptmpchan->channumber == 6
 670                                               || ptmpchan->channumber == 11)) {
 671                                 doneearly = 1;
 672                         }
 673                 }
 674
 675                 /* Send the scan command to the firmware with the specified cfg */
 676                 ret = libertas_prepare_and_send_command(priv, CMD_802_11_SCAN, 0,
 677                                             0, 0, pscancfgout);
 678                 if (scanned >= 2 && !full_scan) {
 679                         ret = 0;
 680                         goto done;
 681                 }
 682                 scanned = 0;
 683         }
 684
 685 done:
 686         priv->adapter->last_scanned_channel = ptmpchan->channumber;
 687
 688         if (priv->adapter->last_scanned_channel) {
 689                 /* Schedule the next part of the partial scan */
 690                 if (!full_scan && !priv->adapter->surpriseremoved) {
 691                         cancel_delayed_work(&priv->scan_work);
 692                         queue_delayed_work(priv->work_thread, &priv->scan_work,
 693                                            msecs_to_jiffies(300));
 694                 }
 695         } else {
 696                 /* All done, tell userspace the scan table has been updated */
 697                 memset(&wrqu, 0, sizeof(union iwreq_data));
 698                 wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
 699         }
 700
 701         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 702         return ret;
 703 }
 704
 705 static void
 706 clear_selected_scan_list_entries(wlan_adapter * adapter,
 707                                  const struct wlan_ioctl_user_scan_cfg * scan_cfg)
 708 {
 709         struct bss_descriptor * bss;
 710         struct bss_descriptor * safe;
 711         u32 clear_ssid_flag = 0, clear_bssid_flag = 0;
 712
 713         if (!scan_cfg)
 714                 return;
 715
 716         if (scan_cfg->clear_ssid && scan_cfg->ssid_len)
 717                 clear_ssid_flag = 1;
 718
 719         if (scan_cfg->clear_bssid
 720             && (compare_ether_addr(scan_cfg->bssid, &zeromac[0]) != 0)
 721             && (compare_ether_addr(scan_cfg->bssid, &bcastmac[0]) != 0)) {
 722                 clear_bssid_flag = 1;
 723         }
 724
 725         if (!clear_ssid_flag && !clear_bssid_flag)
 726                 return;
 727
 728         mutex_lock(&adapter->lock);
 729         list_for_each_entry_safe (bss, safe, &adapter->network_list, list) {
 730                 u32 clear = 0;
 731
 732                 /* Check for an SSID match */
 733                 if (   clear_ssid_flag
 734                     && (bss->ssid_len == scan_cfg->ssid_len)
 735                     && !memcmp(bss->ssid, scan_cfg->ssid, bss->ssid_len))
 736                         clear = 1;
 737
 738                 /* Check for a BSSID match */
 739                 if (   clear_bssid_flag
 740                     && !compare_ether_addr(bss->bssid, scan_cfg->bssid))
 741                         clear = 1;
 742
 743                 if (clear) {
 744                         list_move_tail (&bss->list, &adapter->network_free_list);
 745                         clear_bss_descriptor(bss);
 746                 }
 747         }
 748         mutex_unlock(&adapter->lock);
 749 }
 750
 751
 752 /**
 753  *  @brief Internal function used to start a scan based on an input config
 754  *
 755  *  Use the input user scan configuration information when provided in
 756  *    order to send the appropriate scan commands to firmware to populate or
 757  *    update the internal driver scan table
 758  *
 759  *  @param priv          A pointer to wlan_private structure
 760  *  @param puserscanin   Pointer to the input configuration for the requested
 761  *                       scan.
 762  *
 763  *  @return              0 or < 0 if error
 764  */
 765 int wlan_scan_networks(wlan_private * priv,
 766                        const struct wlan_ioctl_user_scan_cfg * puserscanin,
 767                        int full_scan)
 768 {
 769         wlan_adapter * adapter = priv->adapter;
 770         struct mrvlietypes_chanlistparamset *pchantlvout;
 771         struct chanscanparamset * scan_chan_list = NULL;
 772         struct wlan_scan_cmd_config * scan_cfg = NULL;
 773         u8 filteredscan;
 774         u8 scancurrentchanonly;
 775         int maxchanperscan;
 776         int ret;
 777 #ifdef CONFIG_LIBERTAS_DEBUG
 778         struct bss_descriptor * iter_bss;
 779         int i = 0;
 780 #endif
 781
 782         lbs_deb_enter(LBS_DEB_SCAN);
 783
 784         /* Cancel any partial outstanding partial scans if this scan
 785          * is a full scan.
 786          */
 787         if (full_scan && delayed_work_pending(&priv->scan_work))
 788                 cancel_delayed_work(&priv->scan_work);
 789
 790         scan_chan_list = kzalloc(sizeof(struct chanscanparamset) *
 791                                 WLAN_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
 792         if (scan_chan_list == NULL) {
 793                 ret = -ENOMEM;
 794                 goto out;
 795         }
 796
 797         scan_cfg = wlan_scan_setup_scan_config(priv,
 798                                                puserscanin,
 799                                                &pchantlvout,
 800                                                scan_chan_list,
 801                                                &maxchanperscan,
 802                                                &filteredscan,
 803                                                &scancurrentchanonly);
 804         if (scan_cfg == NULL) {
 805                 ret = -ENOMEM;
 806                 goto out;
 807         }
 808
 809         clear_selected_scan_list_entries(adapter, puserscanin);
 810
 811         /* Keep the data path active if we are only scanning our current channel */
 812         if (!scancurrentchanonly) {
 813                 netif_stop_queue(priv->dev);
 814                 netif_carrier_off(priv->dev);
 815                 if (priv->mesh_dev) {
 816                         netif_stop_queue(priv->mesh_dev);
 817                         netif_carrier_off(priv->mesh_dev);
 818                 }
 819         }
 820
 821         ret = wlan_scan_channel_list(priv,
 822                                      maxchanperscan,
 823                                      filteredscan,
 824                                      scan_cfg,
 825                                      pchantlvout,
 826                                      scan_chan_list,
 827                                      puserscanin,
 828                                      full_scan);
 829
 830 #ifdef CONFIG_LIBERTAS_DEBUG
 831         /* Dump the scan table */
 832         mutex_lock(&adapter->lock);
 833         list_for_each_entry (iter_bss, &adapter->network_list, list) {
 834                 lbs_deb_scan("Scan:(%02d) " MAC_FMT ", RSSI[%03d], SSID[%s]\n",
 835                        i++, MAC_ARG(iter_bss->bssid), (s32) iter_bss->rssi,
 836                        escape_essid(iter_bss->ssid, iter_bss->ssid_len));
 837         }
 838         mutex_unlock(&adapter->lock);
 839 #endif
 840
 841         if (priv->adapter->connect_status == LIBERTAS_CONNECTED) {
 842                 netif_carrier_on(priv->dev);
 843                 netif_wake_queue(priv->dev);
 844                 if (priv->mesh_dev) {
 845                         netif_carrier_on(priv->mesh_dev);
 846                         netif_wake_queue(priv->mesh_dev);
 847                 }
 848         }
 849
 850 out:
 851         if (scan_cfg)
 852                 kfree(scan_cfg);
 853
 854         if (scan_chan_list)
 855                 kfree(scan_chan_list);
 856
 857         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 858         return ret;
 859 }
 860
 861 /**
 862  *  @brief Interpret a BSS scan response returned from the firmware
 863  *
 864  *  Parse the various fixed fields and IEs passed back for a a BSS probe
 865  *   response or beacon from the scan command.  Record information as needed
 866  *   in the scan table struct bss_descriptor for that entry.
 867  *
 868  *  @param bss  Output parameter: Pointer to the BSS Entry
 869  *
 870  *  @return             0 or -1
 871  */
 872 static int libertas_process_bss(struct bss_descriptor * bss,
 873                                 u8 ** pbeaconinfo, int *bytesleft)
 874 {
 875         struct ieeetypes_fhparamset *pFH;
 876         struct ieeetypes_dsparamset *pDS;
 877         struct ieeetypes_cfparamset *pCF;
 878         struct ieeetypes_ibssparamset *pibss;
 879         struct ieeetypes_countryinfoset *pcountryinfo;
 880         u8 *pos, *end, *p;
 881         u8 n_ex_rates = 0, got_basic_rates = 0, n_basic_rates = 0;
 882         u16 beaconsize = 0;
 883         int ret;
 884
 885         lbs_deb_enter(LBS_DEB_ASSOC);
 886
 887         if (*bytesleft >= sizeof(beaconsize)) {
 888                 /* Extract & convert beacon size from the command buffer */
 889                 beaconsize = le16_to_cpup((void *)*pbeaconinfo);
 890                 *bytesleft -= sizeof(beaconsize);
 891                 *pbeaconinfo += sizeof(beaconsize);
 892         }
 893
 894         if (beaconsize == 0 || beaconsize > *bytesleft) {
 895                 *pbeaconinfo += *bytesleft;
 896                 *bytesleft = 0;
 897                 return -1;
 898         }
 899
 900         /* Initialize the current working beacon pointer for this BSS iteration */
 901         pos = *pbeaconinfo;
 902         end = pos + beaconsize;
 903
 904         /* Advance the return beacon pointer past the current beacon */
 905         *pbeaconinfo += beaconsize;
 906         *bytesleft -= beaconsize;
 907
 908         memcpy(bss->bssid, pos, ETH_ALEN);
 909         lbs_deb_scan("process_bss: AP BSSID " MAC_FMT "\n", MAC_ARG(bss->bssid));
 910         pos += ETH_ALEN;
 911
 912         if ((end - pos) < 12) {
 913                 lbs_deb_scan("process_bss: Not enough bytes left\n");
 914                 return -1;
 915         }
 916
 917         /*
 918          * next 4 fields are RSSI, time stamp, beacon interval,
 919          *   and capability information
 920          */
 921
 922         /* RSSI is 1 byte long */
 923         bss->rssi = *pos;
 924         lbs_deb_scan("process_bss: RSSI=%02X\n", *pos);
 925         pos++;
 926
 927         /* time stamp is 8 bytes long */
 928         pos += 8;
 929
 930         /* beacon interval is 2 bytes long */
 931         bss->beaconperiod = le16_to_cpup((void *) pos);
 932         pos += 2;
 933
 934         /* capability information is 2 bytes long */
 935         bss->capability = le16_to_cpup((void *) pos);
 936         lbs_deb_scan("process_bss: capabilities = 0x%4X\n", bss->capability);
 937         pos += 2;
 938
 939         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 940                 lbs_deb_scan("process_bss: AP WEP enabled\n");
 941         if (bss->capability & WLAN_CAPABILITY_IBSS)
 942                 bss->mode = IW_MODE_ADHOC;
 943         else
 944                 bss->mode = IW_MODE_INFRA;
 945
 946         /* rest of the current buffer are IE's */
 947         lbs_deb_scan("process_bss: IE length for this AP = %zd\n", end - pos);
 948         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: IE info", pos, end - pos);
 949
 950         /* process variable IE */
 951         while (pos <= end - 2) {
 952                 struct ieee80211_info_element * elem =
 953                         (struct ieee80211_info_element *) pos;
 954
 955                 if (pos + elem->len > end) {
 956                         lbs_deb_scan("process_bss: error in processing IE, "
 957                                "bytes left < IE length\n");
 958                         break;
 959                 }
 960
 961                 switch (elem->id) {
 962                 case MFIE_TYPE_SSID:
 963                         bss->ssid_len = elem->len;
 964                         memcpy(bss->ssid, elem->data, elem->len);
 965                         lbs_deb_scan("ssid '%s', ssid length %u\n",
 966                                      escape_essid(bss->ssid, bss->ssid_len),
 967                                      bss->ssid_len);
 968                         break;
 969
 970                 case MFIE_TYPE_RATES:
 971                         n_basic_rates = min_t(u8, MAX_RATES, elem->len);
 972                         memcpy(bss->rates, elem->data, n_basic_rates);
 973                         got_basic_rates = 1;
 974                         break;
 975
 976                 case MFIE_TYPE_FH_SET:
 977                         pFH = (struct ieeetypes_fhparamset *) pos;
 978                         memmove(&bss->phyparamset.fhparamset, pFH,
 979                                 sizeof(struct ieeetypes_fhparamset));
 980 #if 0 /* I think we can store these LE */
 981                         bss->phyparamset.fhparamset.dwelltime
 982                             = le16_to_cpu(bss->phyparamset.fhparamset.dwelltime);
 983 #endif
 984                         break;
 985
 986                 case MFIE_TYPE_DS_SET:
 987                         pDS = (struct ieeetypes_dsparamset *) pos;
 988                         bss->channel = pDS->currentchan;
 989                         memcpy(&bss->phyparamset.dsparamset, pDS,
 990                                sizeof(struct ieeetypes_dsparamset));
 991                         break;
 992
 993                 case MFIE_TYPE_CF_SET:
 994                         pCF = (struct ieeetypes_cfparamset *) pos;
 995                         memcpy(&bss->ssparamset.cfparamset, pCF,
 996                                sizeof(struct ieeetypes_cfparamset));
 997                         break;
 998
 999                 case MFIE_TYPE_IBSS_SET:
1000                         pibss = (struct ieeetypes_ibssparamset *) pos;
1001                         bss->atimwindow = le32_to_cpu(pibss->atimwindow);
1002                         memmove(&bss->ssparamset.ibssparamset, pibss,
1003                                 sizeof(struct ieeetypes_ibssparamset));
1004 #if 0
1005                         bss->ssparamset.ibssparamset.atimwindow
1006                             = le16_to_cpu(bss->ssparamset.ibssparamset.atimwindow);
1007 #endif
1008                         break;
1009
1010                 case MFIE_TYPE_COUNTRY:
1011                         pcountryinfo = (struct ieeetypes_countryinfoset *) pos;
1012                         if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
1013                             || pcountryinfo->len > 254) {
1014                                 lbs_deb_scan("process_bss: 11D- Err "
1015                                        "CountryInfo len =%d min=%zd max=254\n",
1016                                        pcountryinfo->len,
1017                                        sizeof(pcountryinfo->countrycode));
1018                                 ret = -1;
1019                                 goto done;
1020                         }
1021
1022                         memcpy(&bss->countryinfo,
1023                                pcountryinfo, pcountryinfo->len + 2);
1024                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: 11d countryinfo",
1025                                 (u8 *) pcountryinfo,
1026                                 (u32) (pcountryinfo->len + 2));
1027                         break;
1028
1029                 case MFIE_TYPE_RATES_EX:
1030                         /* only process extended supported rate if data rate is
1031                          * already found. Data rate IE should come before
1032                          * extended supported rate IE
1033                          */
1034                         if (!got_basic_rates)
1035                                 break;
1036
1037                         n_ex_rates = elem->len;
1038                         if (n_basic_rates + n_ex_rates > MAX_RATES)
1039                                 n_ex_rates = MAX_RATES - n_basic_rates;
1040
1041                         p = bss->rates + n_basic_rates;
1042                         memcpy(p, elem->data, n_ex_rates);
1043                         break;
1044
1045                 case MFIE_TYPE_GENERIC:
1046                         if (elem->len >= 4 &&
1047                             elem->data[0] == 0x00 &&
1048                             elem->data[1] == 0x50 &&
1049                             elem->data[2] == 0xf2 &&
1050                             elem->data[3] == 0x01) {
1051                                 bss->wpa_ie_len = min(elem->len + 2,
1052                                                       MAX_WPA_IE_LEN);
1053                                 memcpy(bss->wpa_ie, elem, bss->wpa_ie_len);
1054                                 lbs_deb_hex(LBS_DEB_SCAN, "process_bss: WPA IE", bss->wpa_ie,
1055                                             elem->len);
1056                         } else if (elem->len >= MARVELL_MESH_IE_LENGTH &&
1057                             elem->data[0] == 0x00 &&
1058                             elem->data[1] == 0x50 &&
1059                             elem->data[2] == 0x43 &&
1060                             elem->data[3] == 0x04) {
1061                                 bss->mesh = 1;
1062                         }
1063                         break;
1064
1065                 case MFIE_TYPE_RSN:
1066                         bss->rsn_ie_len = min(elem->len + 2, MAX_WPA_IE_LEN);
1067                         memcpy(bss->rsn_ie, elem, bss->rsn_ie_len);
1068                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: RSN_IE", bss->rsn_ie, elem->len);
1069                         break;
1070
1071                 default:
1072                         break;
1073                 }
1074
1075                 pos += elem->len + 2;
1076         }
1077
1078         /* Timestamp */
1079         bss->last_scanned = jiffies;
1080         libertas_unset_basic_rate_flags(bss->rates, sizeof(bss->rates));
1081
1082         ret = 0;
1083
1084 done:
1085         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1086         return ret;
1087 }
1088
1089 /**
1090  *  @brief Compare two SSIDs
1091  *
1092  *  @param ssid1    A pointer to ssid to compare
1093  *  @param ssid2    A pointer to ssid to compare
1094  *
1095  *  @return         0--ssid is same, otherwise is different
1096  */
1097 int libertas_ssid_cmp(u8 *ssid1, u8 ssid1_len, u8 *ssid2, u8 ssid2_len)
1098 {
1099         if (ssid1_len != ssid2_len)
1100                 return -1;
1101
1102         return memcmp(ssid1, ssid2, ssid1_len);
1103 }
1104
1105 /**
1106  *  @brief This function finds a specific compatible BSSID in the scan list
1107  *
1108  *  @param adapter  A pointer to wlan_adapter
1109  *  @param bssid    BSSID to find in the scan list
1110  *  @param mode     Network mode: Infrastructure or IBSS
1111  *
1112  *  @return         index in BSSID list, or error return code (< 0)
1113  */
1114 struct bss_descriptor * libertas_find_bssid_in_list(wlan_adapter * adapter,
1115                 u8 * bssid, u8 mode)
1116 {
1117         struct bss_descriptor * iter_bss;
1118         struct bss_descriptor * found_bss = NULL;
1119
1120         if (!bssid)
1121                 return NULL;
1122
1123         lbs_deb_hex(LBS_DEB_SCAN, "looking for",
1124                 bssid, ETH_ALEN);
1125
1126         /* Look through the scan table for a compatible match.  The loop will
1127          *   continue past a matched bssid that is not compatible in case there
1128          *   is an AP with multiple SSIDs assigned to the same BSSID
1129          */
1130         mutex_lock(&adapter->lock);
1131         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1132                 if (compare_ether_addr(iter_bss->bssid, bssid))
1133                         continue; /* bssid doesn't match */
1134                 switch (mode) {
1135                 case IW_MODE_INFRA:
1136                 case IW_MODE_ADHOC:
1137                         if (!is_network_compatible(adapter, iter_bss, mode))
1138                                 break;
1139                         found_bss = iter_bss;
1140                         break;
1141                 default:
1142                         found_bss = iter_bss;
1143                         break;
1144                 }
1145         }
1146         mutex_unlock(&adapter->lock);
1147
1148         return found_bss;
1149 }
1150
1151 /**
1152  *  @brief This function finds ssid in ssid list.
1153  *
1154  *  @param adapter  A pointer to wlan_adapter
1155  *  @param ssid     SSID to find in the list
1156  *  @param bssid    BSSID to qualify the SSID selection (if provided)
1157  *  @param mode     Network mode: Infrastructure or IBSS
1158  *
1159  *  @return         index in BSSID list
1160  */
1161 struct bss_descriptor * libertas_find_ssid_in_list(wlan_adapter * adapter,
1162                    u8 *ssid, u8 ssid_len, u8 * bssid, u8 mode,
1163                    int channel)
1164 {
1165         u8 bestrssi = 0;
1166         struct bss_descriptor * iter_bss = NULL;
1167         struct bss_descriptor * found_bss = NULL;
1168         struct bss_descriptor * tmp_oldest = NULL;
1169
1170         mutex_lock(&adapter->lock);
1171
1172         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1173                 if (   !tmp_oldest
1174                     || (iter_bss->last_scanned < tmp_oldest->last_scanned))
1175                         tmp_oldest = iter_bss;
1176
1177                 if (libertas_ssid_cmp(iter_bss->ssid, iter_bss->ssid_len,
1178                                       ssid, ssid_len) != 0)
1179                         continue; /* ssid doesn't match */
1180                 if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
1181                         continue; /* bssid doesn't match */
1182                 if ((channel > 0) && (iter_bss->channel != channel))
1183                         continue; /* channel doesn't match */
1184
1185                 switch (mode) {
1186                 case IW_MODE_INFRA:
1187                 case IW_MODE_ADHOC:
1188                         if (!is_network_compatible(adapter, iter_bss, mode))
1189                                 break;
1190
1191                         if (bssid) {
1192                                 /* Found requested BSSID */
1193                                 found_bss = iter_bss;
1194                                 goto out;
1195                         }
1196
1197                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1198                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1199                                 found_bss = iter_bss;
1200                         }
1201                         break;
1202                 case IW_MODE_AUTO:
1203                 default:
1204                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1205                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1206                                 found_bss = iter_bss;
1207                         }
1208                         break;
1209                 }
1210         }
1211
1212 out:
1213         mutex_unlock(&adapter->lock);
1214         return found_bss;
1215 }
1216
1217 /**
1218  *  @brief This function finds the best SSID in the Scan List
1219  *
1220  *  Search the scan table for the best SSID that also matches the current
1221  *   adapter network preference (infrastructure or adhoc)
1222  *
1223  *  @param adapter  A pointer to wlan_adapter
1224  *
1225  *  @return         index in BSSID list
1226  */
1227 static struct bss_descriptor * libertas_find_best_ssid_in_list(wlan_adapter * adapter,
1228                 u8 mode)
1229 {
1230         u8 bestrssi = 0;
1231         struct bss_descriptor * iter_bss;
1232         struct bss_descriptor * best_bss = NULL;
1233
1234         mutex_lock(&adapter->lock);
1235
1236         list_for_each_entry (iter_bss, &adapter->network_list, list) {
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                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1243                                 break;
1244                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1245                         best_bss = iter_bss;
1246                         break;
1247                 case IW_MODE_AUTO:
1248                 default:
1249                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1250                                 break;
1251                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1252                         best_bss = iter_bss;
1253                         break;
1254                 }
1255         }
1256
1257         mutex_unlock(&adapter->lock);
1258         return best_bss;
1259 }
1260
1261 /**
1262  *  @brief Find the AP with specific ssid in the scan list
1263  *
1264  *  @param priv         A pointer to wlan_private structure
1265  *  @param pSSID        A pointer to AP's ssid
1266  *
1267  *  @return             0--success, otherwise--fail
1268  */
1269 int libertas_find_best_network_ssid(wlan_private * priv,
1270                 u8 *out_ssid, u8 *out_ssid_len, u8 preferred_mode, u8 *out_mode)
1271 {
1272         wlan_adapter *adapter = priv->adapter;
1273         int ret = -1;
1274         struct bss_descriptor * found;
1275
1276         lbs_deb_enter(LBS_DEB_ASSOC);
1277
1278         wlan_scan_networks(priv, NULL, 1);
1279         if (adapter->surpriseremoved)
1280                 return -1;
1281
1282         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1283
1284         found = libertas_find_best_ssid_in_list(adapter, preferred_mode);
1285         if (found && (found->ssid_len > 0)) {
1286                 memcpy(out_ssid, &found->ssid, IW_ESSID_MAX_SIZE);
1287                 *out_ssid_len = found->ssid_len;
1288                 *out_mode = found->mode;
1289                 ret = 0;
1290         }
1291
1292         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1293         return ret;
1294 }
1295
1296 /**
1297  *  @brief Scan Network
1298  *
1299  *  @param dev          A pointer to net_device structure
1300  *  @param info         A pointer to iw_request_info structure
1301  *  @param vwrq         A pointer to iw_param structure
1302  *  @param extra        A pointer to extra data buf
1303  *
1304  *  @return             0 --success, otherwise fail
1305  */
1306 int libertas_set_scan(struct net_device *dev, struct iw_request_info *info,
1307                   struct iw_param *vwrq, char *extra)
1308 {
1309         wlan_private *priv = dev->priv;
1310         wlan_adapter *adapter = priv->adapter;
1311
1312         lbs_deb_enter(LBS_DEB_SCAN);
1313
1314         if (!delayed_work_pending(&priv->scan_work)) {
1315                 queue_delayed_work(priv->work_thread, &priv->scan_work,
1316                                    msecs_to_jiffies(50));
1317         }
1318
1319         if (adapter->surpriseremoved)
1320                 return -1;
1321
1322         lbs_deb_leave(LBS_DEB_SCAN);
1323         return 0;
1324 }
1325
1326 /**
1327  *  @brief Send a scan command for all available channels filtered on a spec
1328  *
1329  *  @param priv             A pointer to wlan_private structure
1330  *  @param prequestedssid   A pointer to AP's ssid
1331  *  @param keeppreviousscan Flag used to save/clear scan table before scan
1332  *
1333  *  @return                0-success, otherwise fail
1334  */
1335 int libertas_send_specific_ssid_scan(wlan_private * priv,
1336                         u8 *ssid, u8 ssid_len, u8 clear_ssid)
1337 {
1338         wlan_adapter *adapter = priv->adapter;
1339         struct wlan_ioctl_user_scan_cfg scancfg;
1340         int ret = 0;
1341
1342         lbs_deb_enter(LBS_DEB_ASSOC);
1343
1344         if (!ssid_len)
1345                 goto out;
1346
1347         memset(&scancfg, 0x00, sizeof(scancfg));
1348         memcpy(scancfg.ssid, ssid, ssid_len);
1349         scancfg.ssid_len = ssid_len;
1350         scancfg.clear_ssid = clear_ssid;
1351
1352         wlan_scan_networks(priv, &scancfg, 1);
1353         if (adapter->surpriseremoved)
1354                 return -1;
1355         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1356
1357 out:
1358         lbs_deb_leave(LBS_DEB_ASSOC);
1359         return ret;
1360 }
1361
1362 #define MAX_CUSTOM_LEN 64
1363
1364 static inline char *libertas_translate_scan(wlan_private *priv,
1365                                         char *start, char *stop,
1366                                         struct bss_descriptor *bss)
1367 {
1368         wlan_adapter *adapter = priv->adapter;
1369         struct chan_freq_power *cfp;
1370         char *current_val;      /* For rates */
1371         struct iw_event iwe;    /* Temporary buffer */
1372         int j;
1373 #define PERFECT_RSSI ((u8)50)
1374 #define WORST_RSSI   ((u8)0)
1375 #define RSSI_DIFF    ((u8)(PERFECT_RSSI - WORST_RSSI))
1376         u8 rssi;
1377
1378         cfp = libertas_find_cfp_by_band_and_channel(adapter, 0, bss->channel);
1379         if (!cfp) {
1380                 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1381                 return NULL;
1382         }
1383
1384         /* First entry *MUST* be the AP BSSID */
1385         iwe.cmd = SIOCGIWAP;
1386         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1387         memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1388         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1389
1390         /* SSID */
1391         iwe.cmd = SIOCGIWESSID;
1392         iwe.u.data.flags = 1;
1393         iwe.u.data.length = min((u32) bss->ssid_len, (u32) IW_ESSID_MAX_SIZE);
1394         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1395
1396         /* Mode */
1397         iwe.cmd = SIOCGIWMODE;
1398         iwe.u.mode = bss->mode;
1399         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1400
1401         /* Frequency */
1402         iwe.cmd = SIOCGIWFREQ;
1403         iwe.u.freq.m = (long)cfp->freq * 100000;
1404         iwe.u.freq.e = 1;
1405         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1406
1407         /* Add quality statistics */
1408         iwe.cmd = IWEVQUAL;
1409         iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1410         iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1411
1412         rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1413         iwe.u.qual.qual =
1414             (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1415              (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1416             (RSSI_DIFF * RSSI_DIFF);
1417         if (iwe.u.qual.qual > 100)
1418                 iwe.u.qual.qual = 100;
1419
1420         if (adapter->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1421                 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1422         } else {
1423                 iwe.u.qual.noise =
1424                     CAL_NF(adapter->NF[TYPE_BEACON][TYPE_NOAVG]);
1425         }
1426
1427         /* Locally created ad-hoc BSSs won't have beacons if this is the
1428          * only station in the adhoc network; so get signal strength
1429          * from receive statistics.
1430          */
1431         if ((adapter->mode == IW_MODE_ADHOC)
1432             && adapter->adhoccreate
1433             && !libertas_ssid_cmp(adapter->curbssparams.ssid,
1434                                   adapter->curbssparams.ssid_len,
1435                                   bss->ssid, bss->ssid_len)) {
1436                 int snr, nf;
1437                 snr = adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1438                 nf = adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1439                 iwe.u.qual.level = CAL_RSSI(snr, nf);
1440         }
1441         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
1442
1443         /* Add encryption capability */
1444         iwe.cmd = SIOCGIWENCODE;
1445         if (bss->capability & WLAN_CAPABILITY_PRIVACY) {
1446                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1447         } else {
1448                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1449         }
1450         iwe.u.data.length = 0;
1451         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1452
1453         current_val = start + IW_EV_LCP_LEN;
1454
1455         iwe.cmd = SIOCGIWRATE;
1456         iwe.u.bitrate.fixed = 0;
1457         iwe.u.bitrate.disabled = 0;
1458         iwe.u.bitrate.value = 0;
1459
1460         for (j = 0; bss->rates[j] && (j < sizeof(bss->rates)); j++) {
1461                 /* Bit rate given in 500 kb/s units */
1462                 iwe.u.bitrate.value = bss->rates[j] * 500000;
1463                 current_val = iwe_stream_add_value(start, current_val,
1464                                          stop, &iwe, IW_EV_PARAM_LEN);
1465         }
1466         if ((bss->mode == IW_MODE_ADHOC)
1467             && !libertas_ssid_cmp(adapter->curbssparams.ssid,
1468                                   adapter->curbssparams.ssid_len,
1469                                   bss->ssid, bss->ssid_len)
1470             && adapter->adhoccreate) {
1471                 iwe.u.bitrate.value = 22 * 500000;
1472                 current_val = iwe_stream_add_value(start, current_val,
1473                                          stop, &iwe, IW_EV_PARAM_LEN);
1474         }
1475         /* Check if we added any event */
1476         if((current_val - start) > IW_EV_LCP_LEN)
1477                 start = current_val;
1478
1479         memset(&iwe, 0, sizeof(iwe));
1480         if (bss->wpa_ie_len) {
1481                 char buf[MAX_WPA_IE_LEN];
1482                 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1483                 iwe.cmd = IWEVGENIE;
1484                 iwe.u.data.length = bss->wpa_ie_len;
1485                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1486         }
1487
1488         memset(&iwe, 0, sizeof(iwe));
1489         if (bss->rsn_ie_len) {
1490                 char buf[MAX_WPA_IE_LEN];
1491                 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1492                 iwe.cmd = IWEVGENIE;
1493                 iwe.u.data.length = bss->rsn_ie_len;
1494                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1495         }
1496
1497         if (bss->mesh) {
1498                 char custom[MAX_CUSTOM_LEN];
1499                 char *p = custom;
1500
1501                 iwe.cmd = IWEVCUSTOM;
1502                 p += snprintf(p, MAX_CUSTOM_LEN - (p - custom),
1503                               "mesh-type: olpc");
1504                 iwe.u.data.length = p - custom;
1505                 if (iwe.u.data.length)
1506                         start = iwe_stream_add_point(start, stop, &iwe, custom);
1507         }
1508
1509         return start;
1510 }
1511
1512 /**
1513  *  @brief  Retrieve the scan table entries via wireless tools IOCTL call
1514  *
1515  *  @param dev          A pointer to net_device structure
1516  *  @param info         A pointer to iw_request_info structure
1517  *  @param dwrq         A pointer to iw_point structure
1518  *  @param extra        A pointer to extra data buf
1519  *
1520  *  @return             0 --success, otherwise fail
1521  */
1522 int libertas_get_scan(struct net_device *dev, struct iw_request_info *info,
1523                   struct iw_point *dwrq, char *extra)
1524 {
1525 #define SCAN_ITEM_SIZE 128
1526         wlan_private *priv = dev->priv;
1527         wlan_adapter *adapter = priv->adapter;
1528         int err = 0;
1529         char *ev = extra;
1530         char *stop = ev + dwrq->length;
1531         struct bss_descriptor * iter_bss;
1532         struct bss_descriptor * safe;
1533
1534         lbs_deb_enter(LBS_DEB_ASSOC);
1535
1536         /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1537         if ((adapter->mode == IW_MODE_ADHOC) && adapter->adhoccreate) {
1538                 libertas_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
1539                                         CMD_OPTION_WAITFORRSP, 0, NULL);
1540         }
1541
1542         mutex_lock(&adapter->lock);
1543         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1544                 char * next_ev;
1545                 unsigned long stale_time;
1546
1547                 if (stop - ev < SCAN_ITEM_SIZE) {
1548                         err = -E2BIG;
1549                         break;
1550                 }
1551
1552                 /* For mesh device, list only mesh networks */
1553                 if (dev == priv->mesh_dev && !iter_bss->mesh)
1554                         continue;
1555
1556                 /* Prune old an old scan result */
1557                 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1558                 if (time_after(jiffies, stale_time)) {
1559                         list_move_tail (&iter_bss->list,
1560                                         &adapter->network_free_list);
1561                         clear_bss_descriptor(iter_bss);
1562                         continue;
1563                 }
1564
1565                 /* Translate to WE format this entry */
1566                 next_ev = libertas_translate_scan(priv, ev, stop, iter_bss);
1567                 if (next_ev == NULL)
1568                         continue;
1569                 ev = next_ev;
1570         }
1571         mutex_unlock(&adapter->lock);
1572
1573         dwrq->length = (ev - extra);
1574         dwrq->flags = 0;
1575
1576         lbs_deb_leave(LBS_DEB_ASSOC);
1577         return err;
1578 }
1579
1580 /**
1581  *  @brief Prepare a scan command to be sent to the firmware
1582  *
1583  *  Use the wlan_scan_cmd_config sent to the command processing module in
1584  *   the libertas_prepare_and_send_command to configure a cmd_ds_802_11_scan command
1585  *   struct to send to firmware.
1586  *
1587  *  The fixed fields specifying the BSS type and BSSID filters as well as a
1588  *   variable number/length of TLVs are sent in the command to firmware.
1589  *
1590  *  @param priv       A pointer to wlan_private structure
1591  *  @param cmd        A pointer to cmd_ds_command structure to be sent to
1592  *                    firmware with the cmd_DS_801_11_SCAN structure
1593  *  @param pdata_buf  Void pointer cast of a wlan_scan_cmd_config struct used
1594  *                    to set the fields/TLVs for the command sent to firmware
1595  *
1596  *  @return           0 or -1
1597  *
1598  *  @sa wlan_scan_create_channel_list
1599  */
1600 int libertas_cmd_80211_scan(wlan_private * priv,
1601                          struct cmd_ds_command *cmd, void *pdata_buf)
1602 {
1603         struct cmd_ds_802_11_scan *pscan = &cmd->params.scan;
1604         struct wlan_scan_cmd_config *pscancfg;
1605
1606         lbs_deb_enter(LBS_DEB_ASSOC);
1607
1608         pscancfg = pdata_buf;
1609
1610         /* Set fixed field variables in scan command */
1611         pscan->bsstype = pscancfg->bsstype;
1612         memcpy(pscan->bssid, pscancfg->bssid, ETH_ALEN);
1613         memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen);
1614
1615         cmd->command = cpu_to_le16(CMD_802_11_SCAN);
1616
1617         /* size is equal to the sizeof(fixed portions) + the TLV len + header */
1618         cmd->size = cpu_to_le16(sizeof(pscan->bsstype) + ETH_ALEN
1619                                 + pscancfg->tlvbufferlen + S_DS_GEN);
1620
1621         lbs_deb_scan("SCAN_CMD: command=%x, size=%x, seqnum=%x\n",
1622                      le16_to_cpu(cmd->command), le16_to_cpu(cmd->size),
1623                      le16_to_cpu(cmd->seqnum));
1624
1625         lbs_deb_leave(LBS_DEB_ASSOC);
1626         return 0;
1627 }
1628
1629 static inline int is_same_network(struct bss_descriptor *src,
1630                                   struct bss_descriptor *dst)
1631 {
1632         /* A network is only a duplicate if the channel, BSSID, and ESSID
1633          * all match.  We treat all <hidden> with the same BSSID and channel
1634          * as one network */
1635         return ((src->ssid_len == dst->ssid_len) &&
1636                 (src->channel == dst->channel) &&
1637                 !compare_ether_addr(src->bssid, dst->bssid) &&
1638                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1639 }
1640
1641 /**
1642  *  @brief This function handles the command response of scan
1643  *
1644  *   The response buffer for the scan command has the following
1645  *      memory layout:
1646  *
1647  *     .-----------------------------------------------------------.
1648  *     |  header (4 * sizeof(u16)):  Standard command response hdr |
1649  *     .-----------------------------------------------------------.
1650  *     |  bufsize (u16) : sizeof the BSS Description data          |
1651  *     .-----------------------------------------------------------.
1652  *     |  NumOfSet (u8) : Number of BSS Descs returned             |
1653  *     .-----------------------------------------------------------.
1654  *     |  BSSDescription data (variable, size given in bufsize)    |
1655  *     .-----------------------------------------------------------.
1656  *     |  TLV data (variable, size calculated using header->size,  |
1657  *     |            bufsize and sizeof the fixed fields above)     |
1658  *     .-----------------------------------------------------------.
1659  *
1660  *  @param priv    A pointer to wlan_private structure
1661  *  @param resp    A pointer to cmd_ds_command
1662  *
1663  *  @return        0 or -1
1664  */
1665 int libertas_ret_80211_scan(wlan_private * priv, struct cmd_ds_command *resp)
1666 {
1667         wlan_adapter *adapter = priv->adapter;
1668         struct cmd_ds_802_11_scan_rsp *pscan;
1669         struct bss_descriptor * iter_bss;
1670         struct bss_descriptor * safe;
1671         u8 *pbssinfo;
1672         u16 scanrespsize;
1673         int bytesleft;
1674         int idx;
1675         int tlvbufsize;
1676         int ret;
1677
1678         lbs_deb_enter(LBS_DEB_ASSOC);
1679
1680         /* Prune old entries from scan table */
1681         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1682                 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1683                 if (time_before(jiffies, stale_time))
1684                         continue;
1685                 list_move_tail (&iter_bss->list, &adapter->network_free_list);
1686                 clear_bss_descriptor(iter_bss);
1687         }
1688
1689         pscan = &resp->params.scanresp;
1690
1691         if (pscan->nr_sets > MAX_NETWORK_COUNT) {
1692                 lbs_deb_scan(
1693                        "SCAN_RESP: too many scan results (%d, max %d)!!\n",
1694                        pscan->nr_sets, MAX_NETWORK_COUNT);
1695                 ret = -1;
1696                 goto done;
1697         }
1698
1699         bytesleft = le16_to_cpu(pscan->bssdescriptsize);
1700         lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1701
1702         scanrespsize = le16_to_cpu(resp->size);
1703         lbs_deb_scan("SCAN_RESP: returned %d AP before parsing\n",
1704                pscan->nr_sets);
1705
1706         pbssinfo = pscan->bssdesc_and_tlvbuffer;
1707
1708         /* The size of the TLV buffer is equal to the entire command response
1709          *   size (scanrespsize) minus the fixed fields (sizeof()'s), the
1710          *   BSS Descriptions (bssdescriptsize as bytesLef) and the command
1711          *   response header (S_DS_GEN)
1712          */
1713         tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize)
1714                                      + sizeof(pscan->nr_sets)
1715                                      + S_DS_GEN);
1716
1717         /*
1718          *  Process each scan response returned (pscan->nr_sets).  Save
1719          *    the information in the newbssentry and then insert into the
1720          *    driver scan table either as an update to an existing entry
1721          *    or as an addition at the end of the table
1722          */
1723         for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) {
1724                 struct bss_descriptor new;
1725                 struct bss_descriptor * found = NULL;
1726                 struct bss_descriptor * oldest = NULL;
1727
1728                 /* Process the data fields and IEs returned for this BSS */
1729                 memset(&new, 0, sizeof (struct bss_descriptor));
1730                 if (libertas_process_bss(&new, &pbssinfo, &bytesleft) != 0) {
1731                         /* error parsing the scan response, skipped */
1732                         lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1733                         continue;
1734                 }
1735
1736                 /* Try to find this bss in the scan table */
1737                 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1738                         if (is_same_network(iter_bss, &new)) {
1739                                 found = iter_bss;
1740                                 break;
1741                         }
1742
1743                         if ((oldest == NULL) ||
1744                             (iter_bss->last_scanned < oldest->last_scanned))
1745                                 oldest = iter_bss;
1746                 }
1747
1748                 if (found) {
1749                         /* found, clear it */
1750                         clear_bss_descriptor(found);
1751                 } else if (!list_empty(&adapter->network_free_list)) {
1752                         /* Pull one from the free list */
1753                         found = list_entry(adapter->network_free_list.next,
1754                                            struct bss_descriptor, list);
1755                         list_move_tail(&found->list, &adapter->network_list);
1756                 } else if (oldest) {
1757                         /* If there are no more slots, expire the oldest */
1758                         found = oldest;
1759                         clear_bss_descriptor(found);
1760                         list_move_tail(&found->list, &adapter->network_list);
1761                 } else {
1762                         continue;
1763                 }
1764
1765                 lbs_deb_scan("SCAN_RESP: BSSID = " MAC_FMT "\n",
1766                        new.bssid[0], new.bssid[1], new.bssid[2],
1767                        new.bssid[3], new.bssid[4], new.bssid[5]);
1768
1769                 /* Copy the locally created newbssentry to the scan table */
1770                 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1771         }
1772
1773         ret = 0;
1774
1775 done:
1776         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1777         return ret;
1778 }