SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/net/wireless/libertas/scan.c

   1 /**
   2   * Functions implementing wlan scan IOCTL and firmware command APIs
   3   *
   4   * IOCTL handlers as well as command preperation and response routines
   5   *  for sending scan commands to the firmware.
   6   */
   7 #include <linux/ctype.h>
   8 #include <linux/if.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/wireless.h>
  11 #include <linux/etherdevice.h>
  12
  13 #include <net/ieee80211.h>
  14 #include <net/iw_handler.h>
  15
  16 #include "host.h"
  17 #include "decl.h"
  18 #include "dev.h"
  19 #include "scan.h"
  20 #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 = adapter->scantype;
 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  *  @brief Construct a wlan_scan_cmd_config structure to use in issue scan cmds
 319  *
 320  *  Application layer or other functions can invoke wlan_scan_networks
 321  *    with a scan configuration supplied in a wlan_ioctl_user_scan_cfg struct.
 322  *    This structure is used as the basis of one or many wlan_scan_cmd_config
 323  *    commands that are sent to the command processing module and sent to
 324  *    firmware.
 325  *
 326  *  Create a wlan_scan_cmd_config based on the following user supplied
 327  *    parameters (if present):
 328  *             - SSID filter
 329  *             - BSSID filter
 330  *             - Number of Probes to be sent
 331  *             - channel list
 332  *
 333  *  If the SSID or BSSID filter is not present, disable/clear the filter.
 334  *  If the number of probes is not set, use the adapter default setting
 335  *  Qualify the channel
 336  *
 337  *  @param priv             A pointer to wlan_private structure
 338  *  @param puserscanin      NULL or pointer to scan configuration parameters
 339  *  @param ppchantlvout     Output parameter: Pointer to the start of the
 340  *                          channel TLV portion of the output scan config
 341  *  @param pscanchanlist    Output parameter: Pointer to the resulting channel
 342  *                          list to scan
 343  *  @param pmaxchanperscan  Output parameter: Number of channels to scan for
 344  *                          each issuance of the firmware scan command
 345  *  @param pfilteredscan    Output parameter: Flag indicating whether or not
 346  *                          a BSSID or SSID filter is being sent in the
 347  *                          command to firmware.  Used to increase the number
 348  *                          of channels sent in a scan command and to
 349  *                          disable the firmware channel scan filter.
 350  *  @param pscancurrentonly Output parameter: Flag indicating whether or not
 351  *                          we are only scanning our current active channel
 352  *
 353  *  @return                 resulting scan configuration
 354  */
 355 static struct wlan_scan_cmd_config *
 356 wlan_scan_setup_scan_config(wlan_private * priv,
 357                             const struct wlan_ioctl_user_scan_cfg * puserscanin,
 358                             struct mrvlietypes_chanlistparamset ** ppchantlvout,
 359                             struct chanscanparamset * pscanchanlist,
 360                             int *pmaxchanperscan,
 361                             u8 * pfilteredscan,
 362                             u8 * pscancurrentonly)
 363 {
 364         wlan_adapter *adapter = priv->adapter;
 365         struct mrvlietypes_numprobes *pnumprobestlv;
 366         struct mrvlietypes_ssidparamset *pssidtlv;
 367         struct wlan_scan_cmd_config * pscancfgout = NULL;
 368         u8 *ptlvpos;
 369         u16 numprobes;
 370         int chanidx;
 371         int scantype;
 372         int scandur;
 373         int channel;
 374         int radiotype;
 375
 376         pscancfgout = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
 377         if (pscancfgout == NULL)
 378                 goto out;
 379
 380         /* The tlvbufferlen is calculated for each scan command.  The TLVs added
 381          *   in this routine will be preserved since the routine that sends
 382          *   the command will append channelTLVs at *ppchantlvout.  The difference
 383          *   between the *ppchantlvout and the tlvbuffer start will be used
 384          *   to calculate the size of anything we add in this routine.
 385          */
 386         pscancfgout->tlvbufferlen = 0;
 387
 388         /* Running tlv pointer.  Assigned to ppchantlvout at end of function
 389          *  so later routines know where channels can be added to the command buf
 390          */
 391         ptlvpos = pscancfgout->tlvbuffer;
 392
 393         /*
 394          * Set the initial scan paramters for progressive scanning.  If a specific
 395          *   BSSID or SSID is used, the number of channels in the scan command
 396          *   will be increased to the absolute maximum
 397          */
 398         *pmaxchanperscan = MRVDRV_CHANNELS_PER_SCAN_CMD;
 399
 400         /* Initialize the scan as un-filtered by firmware, set to TRUE below if
 401          *   a SSID or BSSID filter is sent in the command
 402          */
 403         *pfilteredscan = 0;
 404
 405         /* Initialize the scan as not being only on the current channel.  If
 406          *   the channel list is customized, only contains one channel, and
 407          *   is the active channel, this is set true and data flow is not halted.
 408          */
 409         *pscancurrentonly = 0;
 410
 411         if (puserscanin) {
 412
 413                 /* Set the bss type scan filter, use adapter setting if unset */
 414                 pscancfgout->bsstype =
 415                     (puserscanin->bsstype ? puserscanin->bsstype : adapter->
 416                      scanmode);
 417
 418                 /* Set the number of probes to send, use adapter setting if unset */
 419                 numprobes = puserscanin->numprobes ? puserscanin->numprobes : 0;
 420
 421                 /*
 422                  * Set the BSSID filter to the incoming configuration,
 423                  *   if non-zero.  If not set, it will remain disabled (all zeros).
 424                  */
 425                 memcpy(pscancfgout->bssid, puserscanin->bssid,
 426                        sizeof(pscancfgout->bssid));
 427
 428                 if (puserscanin->ssid_len) {
 429                         pssidtlv =
 430                             (struct mrvlietypes_ssidparamset *) pscancfgout->
 431                             tlvbuffer;
 432                         pssidtlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
 433                         pssidtlv->header.len = cpu_to_le16(puserscanin->ssid_len);
 434                         memcpy(pssidtlv->ssid, puserscanin->ssid,
 435                                puserscanin->ssid_len);
 436                         ptlvpos += sizeof(pssidtlv->header) + puserscanin->ssid_len;
 437                 }
 438
 439                 /*
 440                  *  The default number of channels sent in the command is low to
 441                  *    ensure the response buffer from the firmware does not truncate
 442                  *    scan results.  That is not an issue with an SSID or BSSID
 443                  *    filter applied to the scan results in the firmware.
 444                  */
 445                 if (   puserscanin->ssid_len
 446                     || (compare_ether_addr(pscancfgout->bssid, &zeromac[0]) != 0)) {
 447                         *pmaxchanperscan = MRVDRV_MAX_CHANNELS_PER_SCAN;
 448                         *pfilteredscan = 1;
 449                 }
 450         } else {
 451                 pscancfgout->bsstype = adapter->scanmode;
 452                 numprobes = 0;
 453         }
 454
 455         /* If the input config or adapter has the number of Probes set, add tlv */
 456         if (numprobes) {
 457                 pnumprobestlv = (struct mrvlietypes_numprobes *) ptlvpos;
 458                 pnumprobestlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 459                 pnumprobestlv->header.len = cpu_to_le16(2);
 460                 pnumprobestlv->numprobes = cpu_to_le16(numprobes);
 461
 462                 ptlvpos += sizeof(*pnumprobestlv);
 463         }
 464
 465         /*
 466          * Set the output for the channel TLV to the address in the tlv buffer
 467          *   past any TLVs that were added in this fuction (SSID, numprobes).
 468          *   channel TLVs will be added past this for each scan command, preserving
 469          *   the TLVs that were previously added.
 470          */
 471         *ppchantlvout = (struct mrvlietypes_chanlistparamset *) ptlvpos;
 472
 473         if (puserscanin && puserscanin->chanlist[0].channumber) {
 474
 475                 lbs_deb_scan("Scan: Using supplied channel list\n");
 476
 477                 for (chanidx = 0;
 478                      chanidx < WLAN_IOCTL_USER_SCAN_CHAN_MAX
 479                      && puserscanin->chanlist[chanidx].channumber; chanidx++) {
 480
 481                         channel = puserscanin->chanlist[chanidx].channumber;
 482                         (pscanchanlist + chanidx)->channumber = channel;
 483
 484                         radiotype = puserscanin->chanlist[chanidx].radiotype;
 485                         (pscanchanlist + chanidx)->radiotype = radiotype;
 486
 487                         scantype = puserscanin->chanlist[chanidx].scantype;
 488
 489                         if (scantype == CMD_SCAN_TYPE_PASSIVE) {
 490                                 (pscanchanlist +
 491                                  chanidx)->chanscanmode.passivescan = 1;
 492                         } else {
 493                                 (pscanchanlist +
 494                                  chanidx)->chanscanmode.passivescan = 0;
 495                         }
 496
 497                         if (puserscanin->chanlist[chanidx].scantime) {
 498                                 scandur =
 499                                     puserscanin->chanlist[chanidx].scantime;
 500                         } else {
 501                                 if (scantype == CMD_SCAN_TYPE_PASSIVE) {
 502                                         scandur = MRVDRV_PASSIVE_SCAN_CHAN_TIME;
 503                                 } else {
 504                                         scandur = MRVDRV_ACTIVE_SCAN_CHAN_TIME;
 505                                 }
 506                         }
 507
 508                         (pscanchanlist + chanidx)->minscantime =
 509                             cpu_to_le16(scandur);
 510                         (pscanchanlist + chanidx)->maxscantime =
 511                             cpu_to_le16(scandur);
 512                 }
 513
 514                 /* Check if we are only scanning the current channel */
 515                 if ((chanidx == 1) && (puserscanin->chanlist[0].channumber
 516                                        ==
 517                                        priv->adapter->curbssparams.channel)) {
 518                         *pscancurrentonly = 1;
 519                         lbs_deb_scan("Scan: Scanning current channel only");
 520                 }
 521
 522         } else {
 523                 lbs_deb_scan("Scan: Creating full region channel list\n");
 524                 wlan_scan_create_channel_list(priv, pscanchanlist,
 525                                               *pfilteredscan);
 526         }
 527
 528 out:
 529         return pscancfgout;
 530 }
 531
 532 /**
 533  *  @brief Construct and send multiple scan config commands to the firmware
 534  *
 535  *  Previous routines have created a wlan_scan_cmd_config with any requested
 536  *   TLVs.  This function splits the channel TLV into maxchanperscan lists
 537  *   and sends the portion of the channel TLV along with the other TLVs
 538  *   to the wlan_cmd routines for execution in the firmware.
 539  *
 540  *  @param priv            A pointer to wlan_private structure
 541  *  @param maxchanperscan  Maximum number channels to be included in each
 542  *                         scan command sent to firmware
 543  *  @param filteredscan    Flag indicating whether or not a BSSID or SSID
 544  *                         filter is being used for the firmware command
 545  *                         scan command sent to firmware
 546  *  @param pscancfgout     Scan configuration used for this scan.
 547  *  @param pchantlvout     Pointer in the pscancfgout where the channel TLV
 548  *                         should start.  This is past any other TLVs that
 549  *                         must be sent down in each firmware command.
 550  *  @param pscanchanlist   List of channels to scan in maxchanperscan segments
 551  *
 552  *  @return                0 or error return otherwise
 553  */
 554 static int wlan_scan_channel_list(wlan_private * priv,
 555                                   int maxchanperscan,
 556                                   u8 filteredscan,
 557                                   struct wlan_scan_cmd_config * pscancfgout,
 558                                   struct mrvlietypes_chanlistparamset * pchantlvout,
 559                                   struct chanscanparamset * pscanchanlist,
 560                                   const struct wlan_ioctl_user_scan_cfg * puserscanin,
 561                                   int full_scan)
 562 {
 563         struct chanscanparamset *ptmpchan;
 564         struct chanscanparamset *pstartchan;
 565         u8 scanband;
 566         int doneearly;
 567         int tlvidx;
 568         int ret = 0;
 569         int scanned = 0;
 570         union iwreq_data wrqu;
 571
 572         lbs_deb_enter(LBS_DEB_ASSOC);
 573
 574         if (pscancfgout == 0 || pchantlvout == 0 || pscanchanlist == 0) {
 575                 lbs_deb_scan("Scan: Null detect: %p, %p, %p\n",
 576                        pscancfgout, pchantlvout, pscanchanlist);
 577                 return -1;
 578         }
 579
 580         pchantlvout->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 581
 582         /* Set the temp channel struct pointer to the start of the desired list */
 583         ptmpchan = pscanchanlist;
 584
 585         if (priv->adapter->last_scanned_channel && !puserscanin)
 586                 ptmpchan += priv->adapter->last_scanned_channel;
 587
 588         /* Loop through the desired channel list, sending a new firmware scan
 589          *   commands for each maxchanperscan channels (or for 1,6,11 individually
 590          *   if configured accordingly)
 591          */
 592         while (ptmpchan->channumber) {
 593
 594                 tlvidx = 0;
 595                 pchantlvout->header.len = 0;
 596                 scanband = ptmpchan->radiotype;
 597                 pstartchan = ptmpchan;
 598                 doneearly = 0;
 599
 600                 /* Construct the channel TLV for the scan command.  Continue to
 601                  *  insert channel TLVs until:
 602                  *    - the tlvidx hits the maximum configured per scan command
 603                  *    - the next channel to insert is 0 (end of desired channel list)
 604                  *    - doneearly is set (controlling individual scanning of 1,6,11)
 605                  */
 606                 while (tlvidx < maxchanperscan && ptmpchan->channumber
 607                        && !doneearly && scanned < 2) {
 608
 609             lbs_deb_scan(
 610                     "Scan: Chan(%3d), Radio(%d), mode(%d,%d), Dur(%d)\n",
 611                 ptmpchan->channumber, ptmpchan->radiotype,
 612                 ptmpchan->chanscanmode.passivescan,
 613                 ptmpchan->chanscanmode.disablechanfilt,
 614                 ptmpchan->maxscantime);
 615
 616                         /* Copy the current channel TLV to the command being prepared */
 617                         memcpy(pchantlvout->chanscanparam + tlvidx,
 618                                ptmpchan, sizeof(pchantlvout->chanscanparam));
 619
 620                         /* Increment the TLV header length by the size appended */
 621                         /* Ew, it would be _so_ nice if we could just declare the
 622                            variable little-endian and let GCC handle it for us */
 623                         pchantlvout->header.len =
 624                                 cpu_to_le16(le16_to_cpu(pchantlvout->header.len) +
 625                                             sizeof(pchantlvout->chanscanparam));
 626
 627                         /*
 628                          *  The tlv buffer length is set to the number of bytes of the
 629                          *    between the channel tlv pointer and the start of the
 630                          *    tlv buffer.  This compensates for any TLVs that were appended
 631                          *    before the channel list.
 632                          */
 633                         pscancfgout->tlvbufferlen = ((u8 *) pchantlvout
 634                                                      - pscancfgout->tlvbuffer);
 635
 636                         /*  Add the size of the channel tlv header and the data length */
 637                         pscancfgout->tlvbufferlen +=
 638                             (sizeof(pchantlvout->header)
 639                              + le16_to_cpu(pchantlvout->header.len));
 640
 641                         /* Increment the index to the channel tlv we are constructing */
 642                         tlvidx++;
 643
 644                         doneearly = 0;
 645
 646                         /* Stop the loop if the *current* channel is in the 1,6,11 set
 647                          *   and we are not filtering on a BSSID or SSID.
 648                          */
 649                         if (!filteredscan && (ptmpchan->channumber == 1
 650                                               || ptmpchan->channumber == 6
 651                                               || ptmpchan->channumber == 11)) {
 652                                 doneearly = 1;
 653                         }
 654
 655                         /* Increment the tmp pointer to the next channel to be scanned */
 656                         ptmpchan++;
 657                         scanned++;
 658
 659                         /* Stop the loop if the *next* channel is in the 1,6,11 set.
 660                          *  This will cause it to be the only channel scanned on the next
 661                          *  interation
 662                          */
 663                         if (!filteredscan && (ptmpchan->channumber == 1
 664                                               || ptmpchan->channumber == 6
 665                                               || ptmpchan->channumber == 11)) {
 666                                 doneearly = 1;
 667                         }
 668                 }
 669
 670                 /* Send the scan command to the firmware with the specified cfg */
 671                 ret = libertas_prepare_and_send_command(priv, CMD_802_11_SCAN, 0,
 672                                             0, 0, pscancfgout);
 673                 if (scanned >= 2 && !full_scan) {
 674                         ret = 0;
 675                         goto done;
 676                 }
 677                 scanned = 0;
 678         }
 679
 680 done:
 681         priv->adapter->last_scanned_channel = ptmpchan->channumber;
 682
 683         /* Tell userspace the scan table has been updated */
 684         memset(&wrqu, 0, sizeof(union iwreq_data));
 685         wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
 686
 687         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 688         return ret;
 689 }
 690
 691 static void
 692 clear_selected_scan_list_entries(wlan_adapter * adapter,
 693                                  const struct wlan_ioctl_user_scan_cfg * scan_cfg)
 694 {
 695         struct bss_descriptor * bss;
 696         struct bss_descriptor * safe;
 697         u32 clear_ssid_flag = 0, clear_bssid_flag = 0;
 698
 699         if (!scan_cfg)
 700                 return;
 701
 702         if (scan_cfg->clear_ssid && scan_cfg->ssid_len)
 703                 clear_ssid_flag = 1;
 704
 705         if (scan_cfg->clear_bssid
 706             && (compare_ether_addr(scan_cfg->bssid, &zeromac[0]) != 0)
 707             && (compare_ether_addr(scan_cfg->bssid, &bcastmac[0]) != 0)) {
 708                 clear_bssid_flag = 1;
 709         }
 710
 711         if (!clear_ssid_flag && !clear_bssid_flag)
 712                 return;
 713
 714         mutex_lock(&adapter->lock);
 715         list_for_each_entry_safe (bss, safe, &adapter->network_list, list) {
 716                 u32 clear = 0;
 717
 718                 /* Check for an SSID match */
 719                 if (   clear_ssid_flag
 720                     && (bss->ssid_len == scan_cfg->ssid_len)
 721                     && !memcmp(bss->ssid, scan_cfg->ssid, bss->ssid_len))
 722                         clear = 1;
 723
 724                 /* Check for a BSSID match */
 725                 if (   clear_bssid_flag
 726                     && !compare_ether_addr(bss->bssid, scan_cfg->bssid))
 727                         clear = 1;
 728
 729                 if (clear) {
 730                         list_move_tail (&bss->list, &adapter->network_free_list);
 731                         clear_bss_descriptor(bss);
 732                 }
 733         }
 734         mutex_unlock(&adapter->lock);
 735 }
 736
 737
 738 /**
 739  *  @brief Internal function used to start a scan based on an input config
 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 wlan_private structure
 746  *  @param puserscanin   Pointer to the input configuration for the requested
 747  *                       scan.
 748  *
 749  *  @return              0 or < 0 if error
 750  */
 751 int wlan_scan_networks(wlan_private * priv,
 752                               const struct wlan_ioctl_user_scan_cfg * puserscanin,
 753                               int full_scan)
 754 {
 755         wlan_adapter * adapter = priv->adapter;
 756         struct mrvlietypes_chanlistparamset *pchantlvout;
 757         struct chanscanparamset * scan_chan_list = NULL;
 758         struct wlan_scan_cmd_config * scan_cfg = NULL;
 759         u8 filteredscan;
 760         u8 scancurrentchanonly;
 761         int maxchanperscan;
 762         int ret;
 763 #ifdef CONFIG_LIBERTAS_DEBUG
 764         struct bss_descriptor * iter_bss;
 765         int i = 0;
 766 #endif
 767
 768         lbs_deb_enter(LBS_DEB_ASSOC);
 769
 770         scan_chan_list = kzalloc(sizeof(struct chanscanparamset) *
 771                                 WLAN_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
 772         if (scan_chan_list == NULL) {
 773                 ret = -ENOMEM;
 774                 goto out;
 775         }
 776
 777         scan_cfg = wlan_scan_setup_scan_config(priv,
 778                                                puserscanin,
 779                                                &pchantlvout,
 780                                                scan_chan_list,
 781                                                &maxchanperscan,
 782                                                &filteredscan,
 783                                                &scancurrentchanonly);
 784         if (scan_cfg == NULL) {
 785                 ret = -ENOMEM;
 786                 goto out;
 787         }
 788
 789         clear_selected_scan_list_entries(adapter, puserscanin);
 790
 791         /* Keep the data path active if we are only scanning our current channel */
 792         if (!scancurrentchanonly) {
 793                 netif_stop_queue(priv->dev);
 794                 netif_carrier_off(priv->dev);
 795                 if (priv->mesh_dev) {
 796                         netif_stop_queue(priv->mesh_dev);
 797                         netif_carrier_off(priv->mesh_dev);
 798                 }
 799         }
 800
 801         ret = wlan_scan_channel_list(priv,
 802                                      maxchanperscan,
 803                                      filteredscan,
 804                                      scan_cfg,
 805                                      pchantlvout,
 806                                      scan_chan_list,
 807                                      puserscanin,
 808                                      full_scan);
 809
 810 #ifdef CONFIG_LIBERTAS_DEBUG
 811         /* Dump the scan table */
 812         mutex_lock(&adapter->lock);
 813         list_for_each_entry (iter_bss, &adapter->network_list, list) {
 814                 lbs_deb_scan("Scan:(%02d) " MAC_FMT ", RSSI[%03d], SSID[%s]\n",
 815                        i++, MAC_ARG(iter_bss->bssid), (s32) iter_bss->rssi,
 816                        escape_essid(iter_bss->ssid, iter_bss->ssid_len));
 817         }
 818         mutex_unlock(&adapter->lock);
 819 #endif
 820
 821         if (priv->adapter->connect_status == LIBERTAS_CONNECTED) {
 822                 netif_carrier_on(priv->dev);
 823                 netif_wake_queue(priv->dev);
 824                 if (priv->mesh_dev) {
 825                         netif_carrier_on(priv->mesh_dev);
 826                         netif_wake_queue(priv->mesh_dev);
 827                 }
 828         }
 829
 830 out:
 831         if (scan_cfg)
 832                 kfree(scan_cfg);
 833
 834         if (scan_chan_list)
 835                 kfree(scan_chan_list);
 836
 837         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 838         return ret;
 839 }
 840
 841 /**
 842  *  @brief Inspect the scan response buffer for pointers to expected TLVs
 843  *
 844  *  TLVs can be included at the end of the scan response BSS information.
 845  *    Parse the data in the buffer for pointers to TLVs that can potentially
 846  *    be passed back in the response
 847  *
 848  *  @param ptlv        Pointer to the start of the TLV buffer to parse
 849  *  @param tlvbufsize  size of the TLV buffer
 850  *  @param ptsftlv     Output parameter: Pointer to the TSF TLV if found
 851  *
 852  *  @return            void
 853  */
 854 static
 855 void wlan_ret_802_11_scan_get_tlv_ptrs(struct mrvlietypes_data * ptlv,
 856                                        int tlvbufsize,
 857                                        struct mrvlietypes_tsftimestamp ** ptsftlv)
 858 {
 859         struct mrvlietypes_data *pcurrenttlv;
 860         int tlvbufleft;
 861         u16 tlvtype;
 862         u16 tlvlen;
 863
 864         pcurrenttlv = ptlv;
 865         tlvbufleft = tlvbufsize;
 866         *ptsftlv = NULL;
 867
 868         lbs_deb_scan("SCAN_RESP: tlvbufsize = %d\n", tlvbufsize);
 869         lbs_deb_hex(LBS_DEB_SCAN, "SCAN_RESP: TLV Buf", (u8 *) ptlv, tlvbufsize);
 870
 871         while (tlvbufleft >= sizeof(struct mrvlietypesheader)) {
 872                 tlvtype = le16_to_cpu(pcurrenttlv->header.type);
 873                 tlvlen = le16_to_cpu(pcurrenttlv->header.len);
 874
 875                 switch (tlvtype) {
 876                 case TLV_TYPE_TSFTIMESTAMP:
 877                         *ptsftlv = (struct mrvlietypes_tsftimestamp *) pcurrenttlv;
 878                         break;
 879
 880                 default:
 881                         lbs_deb_scan("SCAN_RESP: Unhandled TLV = %d\n",
 882                                tlvtype);
 883                         /* Give up, this seems corrupted */
 884                         return;
 885                 }               /* switch */
 886
 887                 tlvbufleft -= (sizeof(ptlv->header) + tlvlen);
 888                 pcurrenttlv =
 889                     (struct mrvlietypes_data *) (pcurrenttlv->Data + tlvlen);
 890         }                       /* while */
 891 }
 892
 893 /**
 894  *  @brief Interpret a BSS scan response returned from the firmware
 895  *
 896  *  Parse the various fixed fields and IEs passed back for a a BSS probe
 897  *   response or beacon from the scan command.  Record information as needed
 898  *   in the scan table struct bss_descriptor for that entry.
 899  *
 900  *  @param bss  Output parameter: Pointer to the BSS Entry
 901  *
 902  *  @return             0 or -1
 903  */
 904 static int libertas_process_bss(struct bss_descriptor * bss,
 905                                 u8 ** pbeaconinfo, int *bytesleft)
 906 {
 907         struct ieeetypes_fhparamset *pFH;
 908         struct ieeetypes_dsparamset *pDS;
 909         struct ieeetypes_cfparamset *pCF;
 910         struct ieeetypes_ibssparamset *pibss;
 911         struct ieeetypes_countryinfoset *pcountryinfo;
 912         u8 *pos, *end, *p;
 913         u8 n_ex_rates = 0, got_basic_rates = 0, n_basic_rates = 0;
 914         u16 beaconsize = 0;
 915         int ret;
 916
 917         lbs_deb_enter(LBS_DEB_ASSOC);
 918
 919         if (*bytesleft >= sizeof(beaconsize)) {
 920                 /* Extract & convert beacon size from the command buffer */
 921                 beaconsize = le16_to_cpup((void *)*pbeaconinfo);
 922                 *bytesleft -= sizeof(beaconsize);
 923                 *pbeaconinfo += sizeof(beaconsize);
 924         }
 925
 926         if (beaconsize == 0 || beaconsize > *bytesleft) {
 927                 *pbeaconinfo += *bytesleft;
 928                 *bytesleft = 0;
 929                 return -1;
 930         }
 931
 932         /* Initialize the current working beacon pointer for this BSS iteration */
 933         pos = *pbeaconinfo;
 934         end = pos + beaconsize;
 935
 936         /* Advance the return beacon pointer past the current beacon */
 937         *pbeaconinfo += beaconsize;
 938         *bytesleft -= beaconsize;
 939
 940         memcpy(bss->bssid, pos, ETH_ALEN);
 941         lbs_deb_scan("process_bss: AP BSSID " MAC_FMT "\n", MAC_ARG(bss->bssid));
 942         pos += ETH_ALEN;
 943
 944         if ((end - pos) < 12) {
 945                 lbs_deb_scan("process_bss: Not enough bytes left\n");
 946                 return -1;
 947         }
 948
 949         /*
 950          * next 4 fields are RSSI, time stamp, beacon interval,
 951          *   and capability information
 952          */
 953
 954         /* RSSI is 1 byte long */
 955         bss->rssi = *pos;
 956         lbs_deb_scan("process_bss: RSSI=%02X\n", *pos);
 957         pos++;
 958
 959         /* time stamp is 8 bytes long */
 960         bss->timestamp = le64_to_cpup((void *) pos);
 961         pos += 8;
 962
 963         /* beacon interval is 2 bytes long */
 964         bss->beaconperiod = le16_to_cpup((void *) pos);
 965         pos += 2;
 966
 967         /* capability information is 2 bytes long */
 968         bss->capability = le16_to_cpup((void *) pos);
 969         lbs_deb_scan("process_bss: capabilities = 0x%4X\n", bss->capability);
 970         pos += 2;
 971
 972         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 973                 lbs_deb_scan("process_bss: AP WEP enabled\n");
 974         if (bss->capability & WLAN_CAPABILITY_IBSS)
 975                 bss->mode = IW_MODE_ADHOC;
 976         else
 977                 bss->mode = IW_MODE_INFRA;
 978
 979         /* rest of the current buffer are IE's */
 980         lbs_deb_scan("process_bss: IE length for this AP = %zd\n", end - pos);
 981         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: IE info", pos, end - pos);
 982
 983         /* process variable IE */
 984         while (pos <= end - 2) {
 985                 struct ieee80211_info_element * elem =
 986                         (struct ieee80211_info_element *) pos;
 987
 988                 if (pos + elem->len > end) {
 989                         lbs_deb_scan("process_bss: error in processing IE, "
 990                                "bytes left < IE length\n");
 991                         break;
 992                 }
 993
 994                 switch (elem->id) {
 995                 case MFIE_TYPE_SSID:
 996                         bss->ssid_len = elem->len;
 997                         memcpy(bss->ssid, elem->data, elem->len);
 998                         lbs_deb_scan("ssid '%s', ssid length %u\n",
 999                                      escape_essid(bss->ssid, bss->ssid_len),
1000                                      bss->ssid_len);
1001                         break;
1002
1003                 case MFIE_TYPE_RATES:
1004                         n_basic_rates = min_t(u8, MAX_RATES, elem->len);
1005                         memcpy(bss->rates, elem->data, n_basic_rates);
1006                         got_basic_rates = 1;
1007                         break;
1008
1009                 case MFIE_TYPE_FH_SET:
1010                         pFH = (struct ieeetypes_fhparamset *) pos;
1011                         memmove(&bss->phyparamset.fhparamset, pFH,
1012                                 sizeof(struct ieeetypes_fhparamset));
1013 #if 0 /* I think we can store these LE */
1014                         bss->phyparamset.fhparamset.dwelltime
1015                             = le16_to_cpu(bss->phyparamset.fhparamset.dwelltime);
1016 #endif
1017                         break;
1018
1019                 case MFIE_TYPE_DS_SET:
1020                         pDS = (struct ieeetypes_dsparamset *) pos;
1021                         bss->channel = pDS->currentchan;
1022                         memcpy(&bss->phyparamset.dsparamset, pDS,
1023                                sizeof(struct ieeetypes_dsparamset));
1024                         break;
1025
1026                 case MFIE_TYPE_CF_SET:
1027                         pCF = (struct ieeetypes_cfparamset *) pos;
1028                         memcpy(&bss->ssparamset.cfparamset, pCF,
1029                                sizeof(struct ieeetypes_cfparamset));
1030                         break;
1031
1032                 case MFIE_TYPE_IBSS_SET:
1033                         pibss = (struct ieeetypes_ibssparamset *) pos;
1034                         bss->atimwindow = le32_to_cpu(pibss->atimwindow);
1035                         memmove(&bss->ssparamset.ibssparamset, pibss,
1036                                 sizeof(struct ieeetypes_ibssparamset));
1037 #if 0
1038                         bss->ssparamset.ibssparamset.atimwindow
1039                             = le16_to_cpu(bss->ssparamset.ibssparamset.atimwindow);
1040 #endif
1041                         break;
1042
1043                 case MFIE_TYPE_COUNTRY:
1044                         pcountryinfo = (struct ieeetypes_countryinfoset *) pos;
1045                         if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
1046                             || pcountryinfo->len > 254) {
1047                                 lbs_deb_scan("process_bss: 11D- Err "
1048                                        "CountryInfo len =%d min=%zd max=254\n",
1049                                        pcountryinfo->len,
1050                                        sizeof(pcountryinfo->countrycode));
1051                                 ret = -1;
1052                                 goto done;
1053                         }
1054
1055                         memcpy(&bss->countryinfo,
1056                                pcountryinfo, pcountryinfo->len + 2);
1057                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: 11d countryinfo",
1058                                 (u8 *) pcountryinfo,
1059                                 (u32) (pcountryinfo->len + 2));
1060                         break;
1061
1062                 case MFIE_TYPE_RATES_EX:
1063                         /* only process extended supported rate if data rate is
1064                          * already found. Data rate IE should come before
1065                          * extended supported rate IE
1066                          */
1067                         if (!got_basic_rates)
1068                                 break;
1069
1070                         n_ex_rates = elem->len;
1071                         if (n_basic_rates + n_ex_rates > MAX_RATES)
1072                                 n_ex_rates = MAX_RATES - n_basic_rates;
1073
1074                         p = bss->rates + n_basic_rates;
1075                         memcpy(p, elem->data, n_ex_rates);
1076                         break;
1077
1078                 case MFIE_TYPE_GENERIC:
1079                         if (elem->len >= 4 &&
1080                             elem->data[0] == 0x00 &&
1081                             elem->data[1] == 0x50 &&
1082                             elem->data[2] == 0xf2 &&
1083                             elem->data[3] == 0x01) {
1084                                 bss->wpa_ie_len = min(elem->len + 2,
1085                                                       MAX_WPA_IE_LEN);
1086                                 memcpy(bss->wpa_ie, elem, bss->wpa_ie_len);
1087                                 lbs_deb_hex(LBS_DEB_SCAN, "process_bss: WPA IE", bss->wpa_ie,
1088                                             elem->len);
1089                         } else if (elem->len >= MARVELL_MESH_IE_LENGTH &&
1090                             elem->data[0] == 0x00 &&
1091                             elem->data[1] == 0x50 &&
1092                             elem->data[2] == 0x43 &&
1093                             elem->data[3] == 0x04) {
1094                                 bss->mesh = 1;
1095                         }
1096                         break;
1097
1098                 case MFIE_TYPE_RSN:
1099                         bss->rsn_ie_len = min(elem->len + 2, MAX_WPA_IE_LEN);
1100                         memcpy(bss->rsn_ie, elem, bss->rsn_ie_len);
1101                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: RSN_IE", bss->rsn_ie, elem->len);
1102                         break;
1103
1104                 default:
1105                         break;
1106                 }
1107
1108                 pos += elem->len + 2;
1109         }
1110
1111         /* Timestamp */
1112         bss->last_scanned = jiffies;
1113         libertas_unset_basic_rate_flags(bss->rates, sizeof(bss->rates));
1114
1115         ret = 0;
1116
1117 done:
1118         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1119         return ret;
1120 }
1121
1122 /**
1123  *  @brief Compare two SSIDs
1124  *
1125  *  @param ssid1    A pointer to ssid to compare
1126  *  @param ssid2    A pointer to ssid to compare
1127  *
1128  *  @return         0--ssid is same, otherwise is different
1129  */
1130 int libertas_ssid_cmp(u8 *ssid1, u8 ssid1_len, u8 *ssid2, u8 ssid2_len)
1131 {
1132         if (ssid1_len != ssid2_len)
1133                 return -1;
1134
1135         return memcmp(ssid1, ssid2, ssid1_len);
1136 }
1137
1138 /**
1139  *  @brief This function finds a specific compatible BSSID in the scan list
1140  *
1141  *  @param adapter  A pointer to wlan_adapter
1142  *  @param bssid    BSSID to find in the scan list
1143  *  @param mode     Network mode: Infrastructure or IBSS
1144  *
1145  *  @return         index in BSSID list, or error return code (< 0)
1146  */
1147 struct bss_descriptor * libertas_find_bssid_in_list(wlan_adapter * adapter,
1148                 u8 * bssid, u8 mode)
1149 {
1150         struct bss_descriptor * iter_bss;
1151         struct bss_descriptor * found_bss = NULL;
1152
1153         if (!bssid)
1154                 return NULL;
1155
1156         lbs_deb_hex(LBS_DEB_SCAN, "looking for",
1157                 bssid, ETH_ALEN);
1158
1159         /* Look through the scan table for a compatible match.  The loop will
1160          *   continue past a matched bssid that is not compatible in case there
1161          *   is an AP with multiple SSIDs assigned to the same BSSID
1162          */
1163         mutex_lock(&adapter->lock);
1164         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1165                 if (compare_ether_addr(iter_bss->bssid, bssid))
1166                         continue; /* bssid doesn't match */
1167                 switch (mode) {
1168                 case IW_MODE_INFRA:
1169                 case IW_MODE_ADHOC:
1170                         if (!is_network_compatible(adapter, iter_bss, mode))
1171                                 break;
1172                         found_bss = iter_bss;
1173                         break;
1174                 default:
1175                         found_bss = iter_bss;
1176                         break;
1177                 }
1178         }
1179         mutex_unlock(&adapter->lock);
1180
1181         return found_bss;
1182 }
1183
1184 /**
1185  *  @brief This function finds ssid in ssid list.
1186  *
1187  *  @param adapter  A pointer to wlan_adapter
1188  *  @param ssid     SSID to find in the list
1189  *  @param bssid    BSSID to qualify the SSID selection (if provided)
1190  *  @param mode     Network mode: Infrastructure or IBSS
1191  *
1192  *  @return         index in BSSID list
1193  */
1194 struct bss_descriptor * libertas_find_ssid_in_list(wlan_adapter * adapter,
1195                    u8 *ssid, u8 ssid_len, u8 * bssid, u8 mode,
1196                    int channel)
1197 {
1198         u8 bestrssi = 0;
1199         struct bss_descriptor * iter_bss = NULL;
1200         struct bss_descriptor * found_bss = NULL;
1201         struct bss_descriptor * tmp_oldest = NULL;
1202
1203         mutex_lock(&adapter->lock);
1204
1205         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1206                 if (   !tmp_oldest
1207                     || (iter_bss->last_scanned < tmp_oldest->last_scanned))
1208                         tmp_oldest = iter_bss;
1209
1210                 if (libertas_ssid_cmp(iter_bss->ssid, iter_bss->ssid_len,
1211                                       ssid, ssid_len) != 0)
1212                         continue; /* ssid doesn't match */
1213                 if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
1214                         continue; /* bssid doesn't match */
1215                 if ((channel > 0) && (iter_bss->channel != channel))
1216                         continue; /* channel doesn't match */
1217
1218                 switch (mode) {
1219                 case IW_MODE_INFRA:
1220                 case IW_MODE_ADHOC:
1221                         if (!is_network_compatible(adapter, iter_bss, mode))
1222                                 break;
1223
1224                         if (bssid) {
1225                                 /* Found requested BSSID */
1226                                 found_bss = iter_bss;
1227                                 goto out;
1228                         }
1229
1230                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1231                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1232                                 found_bss = iter_bss;
1233                         }
1234                         break;
1235                 case IW_MODE_AUTO:
1236                 default:
1237                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1238                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1239                                 found_bss = iter_bss;
1240                         }
1241                         break;
1242                 }
1243         }
1244
1245 out:
1246         mutex_unlock(&adapter->lock);
1247         return found_bss;
1248 }
1249
1250 /**
1251  *  @brief This function finds the best SSID in the Scan List
1252  *
1253  *  Search the scan table for the best SSID that also matches the current
1254  *   adapter network preference (infrastructure or adhoc)
1255  *
1256  *  @param adapter  A pointer to wlan_adapter
1257  *
1258  *  @return         index in BSSID list
1259  */
1260 static struct bss_descriptor * libertas_find_best_ssid_in_list(wlan_adapter * adapter,
1261                 u8 mode)
1262 {
1263         u8 bestrssi = 0;
1264         struct bss_descriptor * iter_bss;
1265         struct bss_descriptor * best_bss = NULL;
1266
1267         mutex_lock(&adapter->lock);
1268
1269         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1270                 switch (mode) {
1271                 case IW_MODE_INFRA:
1272                 case IW_MODE_ADHOC:
1273                         if (!is_network_compatible(adapter, iter_bss, mode))
1274                                 break;
1275                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1276                                 break;
1277                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1278                         best_bss = iter_bss;
1279                         break;
1280                 case IW_MODE_AUTO:
1281                 default:
1282                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1283                                 break;
1284                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1285                         best_bss = iter_bss;
1286                         break;
1287                 }
1288         }
1289
1290         mutex_unlock(&adapter->lock);
1291         return best_bss;
1292 }
1293
1294 /**
1295  *  @brief Find the AP with specific ssid in the scan list
1296  *
1297  *  @param priv         A pointer to wlan_private structure
1298  *  @param pSSID        A pointer to AP's ssid
1299  *
1300  *  @return             0--success, otherwise--fail
1301  */
1302 int libertas_find_best_network_ssid(wlan_private * priv,
1303                 u8 *out_ssid, u8 *out_ssid_len, u8 preferred_mode, u8 *out_mode)
1304 {
1305         wlan_adapter *adapter = priv->adapter;
1306         int ret = -1;
1307         struct bss_descriptor * found;
1308
1309         lbs_deb_enter(LBS_DEB_ASSOC);
1310
1311         wlan_scan_networks(priv, NULL, 1);
1312         if (adapter->surpriseremoved)
1313                 return -1;
1314
1315         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1316
1317         found = libertas_find_best_ssid_in_list(adapter, preferred_mode);
1318         if (found && (found->ssid_len > 0)) {
1319                 memcpy(out_ssid, &found->ssid, IW_ESSID_MAX_SIZE);
1320                 *out_ssid_len = found->ssid_len;
1321                 *out_mode = found->mode;
1322                 ret = 0;
1323         }
1324
1325         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1326         return ret;
1327 }
1328
1329 /**
1330  *  @brief Scan Network
1331  *
1332  *  @param dev          A pointer to net_device structure
1333  *  @param info         A pointer to iw_request_info structure
1334  *  @param vwrq         A pointer to iw_param structure
1335  *  @param extra        A pointer to extra data buf
1336  *
1337  *  @return             0 --success, otherwise fail
1338  */
1339 int libertas_set_scan(struct net_device *dev, struct iw_request_info *info,
1340                   struct iw_param *vwrq, char *extra)
1341 {
1342         wlan_private *priv = dev->priv;
1343         wlan_adapter *adapter = priv->adapter;
1344
1345         lbs_deb_enter(LBS_DEB_SCAN);
1346
1347         wlan_scan_networks(priv, NULL, 0);
1348
1349         if (adapter->surpriseremoved)
1350                 return -1;
1351
1352         lbs_deb_leave(LBS_DEB_SCAN);
1353         return 0;
1354 }
1355
1356 /**
1357  *  @brief Send a scan command for all available channels filtered on a spec
1358  *
1359  *  @param priv             A pointer to wlan_private structure
1360  *  @param prequestedssid   A pointer to AP's ssid
1361  *  @param keeppreviousscan Flag used to save/clear scan table before scan
1362  *
1363  *  @return                0-success, otherwise fail
1364  */
1365 int libertas_send_specific_ssid_scan(wlan_private * priv,
1366                         u8 *ssid, u8 ssid_len, u8 clear_ssid)
1367 {
1368         wlan_adapter *adapter = priv->adapter;
1369         struct wlan_ioctl_user_scan_cfg scancfg;
1370         int ret = 0;
1371
1372         lbs_deb_enter(LBS_DEB_ASSOC);
1373
1374         if (!ssid_len)
1375                 goto out;
1376
1377         memset(&scancfg, 0x00, sizeof(scancfg));
1378         memcpy(scancfg.ssid, ssid, ssid_len);
1379         scancfg.ssid_len = ssid_len;
1380         scancfg.clear_ssid = clear_ssid;
1381
1382         wlan_scan_networks(priv, &scancfg, 1);
1383         if (adapter->surpriseremoved)
1384                 return -1;
1385         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1386
1387 out:
1388         lbs_deb_leave(LBS_DEB_ASSOC);
1389         return ret;
1390 }
1391
1392 static inline char *libertas_translate_scan(wlan_private *priv,
1393                                         char *start, char *stop,
1394                                         struct bss_descriptor *bss)
1395 {
1396         wlan_adapter *adapter = priv->adapter;
1397         struct chan_freq_power *cfp;
1398         char *current_val;      /* For rates */
1399         struct iw_event iwe;    /* Temporary buffer */
1400         int j;
1401 #define PERFECT_RSSI ((u8)50)
1402 #define WORST_RSSI   ((u8)0)
1403 #define RSSI_DIFF    ((u8)(PERFECT_RSSI - WORST_RSSI))
1404         u8 rssi;
1405
1406         cfp = libertas_find_cfp_by_band_and_channel(adapter, 0, bss->channel);
1407         if (!cfp) {
1408                 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1409                 return NULL;
1410         }
1411
1412         /* First entry *MUST* be the AP BSSID */
1413         iwe.cmd = SIOCGIWAP;
1414         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1415         memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1416         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1417
1418         /* SSID */
1419         iwe.cmd = SIOCGIWESSID;
1420         iwe.u.data.flags = 1;
1421         iwe.u.data.length = min((u32) bss->ssid_len, (u32) IW_ESSID_MAX_SIZE);
1422         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1423
1424         /* Mode */
1425         iwe.cmd = SIOCGIWMODE;
1426         iwe.u.mode = bss->mode;
1427         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1428
1429         /* Frequency */
1430         iwe.cmd = SIOCGIWFREQ;
1431         iwe.u.freq.m = (long)cfp->freq * 100000;
1432         iwe.u.freq.e = 1;
1433         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1434
1435         /* Add quality statistics */
1436         iwe.cmd = IWEVQUAL;
1437         iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1438         iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1439
1440         rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1441         iwe.u.qual.qual =
1442             (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1443              (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1444             (RSSI_DIFF * RSSI_DIFF);
1445         if (iwe.u.qual.qual > 100)
1446                 iwe.u.qual.qual = 100;
1447
1448         if (adapter->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1449                 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1450         } else {
1451                 iwe.u.qual.noise =
1452                     CAL_NF(adapter->NF[TYPE_BEACON][TYPE_NOAVG]);
1453         }
1454
1455         /* Locally created ad-hoc BSSs won't have beacons if this is the
1456          * only station in the adhoc network; so get signal strength
1457          * from receive statistics.
1458          */
1459         if ((adapter->mode == IW_MODE_ADHOC)
1460             && adapter->adhoccreate
1461             && !libertas_ssid_cmp(adapter->curbssparams.ssid,
1462                                   adapter->curbssparams.ssid_len,
1463                                   bss->ssid, bss->ssid_len)) {
1464                 int snr, nf;
1465                 snr = adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1466                 nf = adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1467                 iwe.u.qual.level = CAL_RSSI(snr, nf);
1468         }
1469         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
1470
1471         /* Add encryption capability */
1472         iwe.cmd = SIOCGIWENCODE;
1473         if (bss->capability & WLAN_CAPABILITY_PRIVACY) {
1474                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1475         } else {
1476                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1477         }
1478         iwe.u.data.length = 0;
1479         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1480
1481         current_val = start + IW_EV_LCP_LEN;
1482
1483         iwe.cmd = SIOCGIWRATE;
1484         iwe.u.bitrate.fixed = 0;
1485         iwe.u.bitrate.disabled = 0;
1486         iwe.u.bitrate.value = 0;
1487
1488         for (j = 0; bss->rates[j] && (j < sizeof(bss->rates)); j++) {
1489                 /* Bit rate given in 500 kb/s units */
1490                 iwe.u.bitrate.value = bss->rates[j] * 500000;
1491                 current_val = iwe_stream_add_value(start, current_val,
1492                                          stop, &iwe, IW_EV_PARAM_LEN);
1493         }
1494         if ((bss->mode == IW_MODE_ADHOC)
1495             && !libertas_ssid_cmp(adapter->curbssparams.ssid,
1496                                   adapter->curbssparams.ssid_len,
1497                                   bss->ssid, bss->ssid_len)
1498             && adapter->adhoccreate) {
1499                 iwe.u.bitrate.value = 22 * 500000;
1500                 current_val = iwe_stream_add_value(start, current_val,
1501                                          stop, &iwe, IW_EV_PARAM_LEN);
1502         }
1503         /* Check if we added any event */
1504         if((current_val - start) > IW_EV_LCP_LEN)
1505                 start = current_val;
1506
1507         memset(&iwe, 0, sizeof(iwe));
1508         if (bss->wpa_ie_len) {
1509                 char buf[MAX_WPA_IE_LEN];
1510                 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1511                 iwe.cmd = IWEVGENIE;
1512                 iwe.u.data.length = bss->wpa_ie_len;
1513                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1514         }
1515
1516         memset(&iwe, 0, sizeof(iwe));
1517         if (bss->rsn_ie_len) {
1518                 char buf[MAX_WPA_IE_LEN];
1519                 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1520                 iwe.cmd = IWEVGENIE;
1521                 iwe.u.data.length = bss->rsn_ie_len;
1522                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1523         }
1524
1525         return start;
1526 }
1527
1528 /**
1529  *  @brief  Retrieve the scan table entries via wireless tools IOCTL call
1530  *
1531  *  @param dev          A pointer to net_device structure
1532  *  @param info         A pointer to iw_request_info structure
1533  *  @param dwrq         A pointer to iw_point structure
1534  *  @param extra        A pointer to extra data buf
1535  *
1536  *  @return             0 --success, otherwise fail
1537  */
1538 int libertas_get_scan(struct net_device *dev, struct iw_request_info *info,
1539                   struct iw_point *dwrq, char *extra)
1540 {
1541 #define SCAN_ITEM_SIZE 128
1542         wlan_private *priv = dev->priv;
1543         wlan_adapter *adapter = priv->adapter;
1544         int err = 0;
1545         char *ev = extra;
1546         char *stop = ev + dwrq->length;
1547         struct bss_descriptor * iter_bss;
1548         struct bss_descriptor * safe;
1549
1550         lbs_deb_enter(LBS_DEB_ASSOC);
1551
1552         /* If we've got an uncompleted scan, schedule the next part */
1553         if (!adapter->nr_cmd_pending && adapter->last_scanned_channel)
1554                 wlan_scan_networks(priv, NULL, 0);
1555
1556         /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1557         if ((adapter->mode == IW_MODE_ADHOC) && adapter->adhoccreate) {
1558                 libertas_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
1559                                         CMD_OPTION_WAITFORRSP, 0, NULL);
1560         }
1561
1562         mutex_lock(&adapter->lock);
1563         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1564                 char * next_ev;
1565                 unsigned long stale_time;
1566
1567                 if (stop - ev < SCAN_ITEM_SIZE) {
1568                         err = -E2BIG;
1569                         break;
1570                 }
1571
1572                 /* For mesh device, list only mesh networks */
1573                 if (dev == priv->mesh_dev && !iter_bss->mesh)
1574                         continue;
1575
1576                 /* Prune old an old scan result */
1577                 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1578                 if (time_after(jiffies, stale_time)) {
1579                         list_move_tail (&iter_bss->list,
1580                                         &adapter->network_free_list);
1581                         clear_bss_descriptor(iter_bss);
1582                         continue;
1583                 }
1584
1585                 /* Translate to WE format this entry */
1586                 next_ev = libertas_translate_scan(priv, ev, stop, iter_bss);
1587                 if (next_ev == NULL)
1588                         continue;
1589                 ev = next_ev;
1590         }
1591         mutex_unlock(&adapter->lock);
1592
1593         dwrq->length = (ev - extra);
1594         dwrq->flags = 0;
1595
1596         lbs_deb_leave(LBS_DEB_ASSOC);
1597         return err;
1598 }
1599
1600 /**
1601  *  @brief Prepare a scan command to be sent to the firmware
1602  *
1603  *  Use the wlan_scan_cmd_config sent to the command processing module in
1604  *   the libertas_prepare_and_send_command to configure a cmd_ds_802_11_scan command
1605  *   struct to send to firmware.
1606  *
1607  *  The fixed fields specifying the BSS type and BSSID filters as well as a
1608  *   variable number/length of TLVs are sent in the command to firmware.
1609  *
1610  *  @param priv       A pointer to wlan_private structure
1611  *  @param cmd        A pointer to cmd_ds_command structure to be sent to
1612  *                    firmware with the cmd_DS_801_11_SCAN structure
1613  *  @param pdata_buf  Void pointer cast of a wlan_scan_cmd_config struct used
1614  *                    to set the fields/TLVs for the command sent to firmware
1615  *
1616  *  @return           0 or -1
1617  *
1618  *  @sa wlan_scan_create_channel_list
1619  */
1620 int libertas_cmd_80211_scan(wlan_private * priv,
1621                          struct cmd_ds_command *cmd, void *pdata_buf)
1622 {
1623         struct cmd_ds_802_11_scan *pscan = &cmd->params.scan;
1624         struct wlan_scan_cmd_config *pscancfg;
1625
1626         lbs_deb_enter(LBS_DEB_ASSOC);
1627
1628         pscancfg = pdata_buf;
1629
1630         /* Set fixed field variables in scan command */
1631         pscan->bsstype = pscancfg->bsstype;
1632         memcpy(pscan->bssid, pscancfg->bssid, ETH_ALEN);
1633         memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen);
1634
1635         cmd->command = cpu_to_le16(CMD_802_11_SCAN);
1636
1637         /* size is equal to the sizeof(fixed portions) + the TLV len + header */
1638         cmd->size = cpu_to_le16(sizeof(pscan->bsstype) + ETH_ALEN
1639                                 + pscancfg->tlvbufferlen + S_DS_GEN);
1640
1641         lbs_deb_scan("SCAN_CMD: command=%x, size=%x, seqnum=%x\n",
1642                      le16_to_cpu(cmd->command), le16_to_cpu(cmd->size),
1643                      le16_to_cpu(cmd->seqnum));
1644
1645         lbs_deb_leave(LBS_DEB_ASSOC);
1646         return 0;
1647 }
1648
1649 static inline int is_same_network(struct bss_descriptor *src,
1650                                   struct bss_descriptor *dst)
1651 {
1652         /* A network is only a duplicate if the channel, BSSID, and ESSID
1653          * all match.  We treat all <hidden> with the same BSSID and channel
1654          * as one network */
1655         return ((src->ssid_len == dst->ssid_len) &&
1656                 (src->channel == dst->channel) &&
1657                 !compare_ether_addr(src->bssid, dst->bssid) &&
1658                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1659 }
1660
1661 /**
1662  *  @brief This function handles the command response of scan
1663  *
1664  *   The response buffer for the scan command has the following
1665  *      memory layout:
1666  *
1667  *     .-----------------------------------------------------------.
1668  *     |  header (4 * sizeof(u16)):  Standard command response hdr |
1669  *     .-----------------------------------------------------------.
1670  *     |  bufsize (u16) : sizeof the BSS Description data          |
1671  *     .-----------------------------------------------------------.
1672  *     |  NumOfSet (u8) : Number of BSS Descs returned             |
1673  *     .-----------------------------------------------------------.
1674  *     |  BSSDescription data (variable, size given in bufsize)    |
1675  *     .-----------------------------------------------------------.
1676  *     |  TLV data (variable, size calculated using header->size,  |
1677  *     |            bufsize and sizeof the fixed fields above)     |
1678  *     .-----------------------------------------------------------.
1679  *
1680  *  @param priv    A pointer to wlan_private structure
1681  *  @param resp    A pointer to cmd_ds_command
1682  *
1683  *  @return        0 or -1
1684  */
1685 int libertas_ret_80211_scan(wlan_private * priv, struct cmd_ds_command *resp)
1686 {
1687         wlan_adapter *adapter = priv->adapter;
1688         struct cmd_ds_802_11_scan_rsp *pscan;
1689         struct mrvlietypes_data *ptlv;
1690         struct mrvlietypes_tsftimestamp *ptsftlv;
1691         struct bss_descriptor * iter_bss;
1692         struct bss_descriptor * safe;
1693         u8 *pbssinfo;
1694         u16 scanrespsize;
1695         int bytesleft;
1696         int idx;
1697         int tlvbufsize;
1698         int ret;
1699
1700         lbs_deb_enter(LBS_DEB_ASSOC);
1701
1702         /* Prune old entries from scan table */
1703         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1704                 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1705                 if (time_before(jiffies, stale_time))
1706                         continue;
1707                 list_move_tail (&iter_bss->list, &adapter->network_free_list);
1708                 clear_bss_descriptor(iter_bss);
1709         }
1710
1711         pscan = &resp->params.scanresp;
1712
1713         if (pscan->nr_sets > MAX_NETWORK_COUNT) {
1714                 lbs_deb_scan(
1715                        "SCAN_RESP: too many scan results (%d, max %d)!!\n",
1716                        pscan->nr_sets, MAX_NETWORK_COUNT);
1717                 ret = -1;
1718                 goto done;
1719         }
1720
1721         bytesleft = le16_to_cpu(pscan->bssdescriptsize);
1722         lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1723
1724         scanrespsize = le16_to_cpu(resp->size);
1725         lbs_deb_scan("SCAN_RESP: returned %d AP before parsing\n",
1726                pscan->nr_sets);
1727
1728         pbssinfo = pscan->bssdesc_and_tlvbuffer;
1729
1730         /* The size of the TLV buffer is equal to the entire command response
1731          *   size (scanrespsize) minus the fixed fields (sizeof()'s), the
1732          *   BSS Descriptions (bssdescriptsize as bytesLef) and the command
1733          *   response header (S_DS_GEN)
1734          */
1735         tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize)
1736                                      + sizeof(pscan->nr_sets)
1737                                      + S_DS_GEN);
1738
1739         ptlv = (struct mrvlietypes_data *) (pscan->bssdesc_and_tlvbuffer + bytesleft);
1740
1741         /* Search the TLV buffer space in the scan response for any valid TLVs */
1742         wlan_ret_802_11_scan_get_tlv_ptrs(ptlv, tlvbufsize, &ptsftlv);
1743
1744         /*
1745          *  Process each scan response returned (pscan->nr_sets).  Save
1746          *    the information in the newbssentry and then insert into the
1747          *    driver scan table either as an update to an existing entry
1748          *    or as an addition at the end of the table
1749          */
1750         for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) {
1751                 struct bss_descriptor new;
1752                 struct bss_descriptor * found = NULL;
1753                 struct bss_descriptor * oldest = NULL;
1754
1755                 /* Process the data fields and IEs returned for this BSS */
1756                 memset(&new, 0, sizeof (struct bss_descriptor));
1757                 if (libertas_process_bss(&new, &pbssinfo, &bytesleft) != 0) {
1758                         /* error parsing the scan response, skipped */
1759                         lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1760                         continue;
1761                 }
1762
1763                 /* Try to find this bss in the scan table */
1764                 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1765                         if (is_same_network(iter_bss, &new)) {
1766                                 found = iter_bss;
1767                                 break;
1768                         }
1769
1770                         if ((oldest == NULL) ||
1771                             (iter_bss->last_scanned < oldest->last_scanned))
1772                                 oldest = iter_bss;
1773                 }
1774
1775                 if (found) {
1776                         /* found, clear it */
1777                         clear_bss_descriptor(found);
1778                 } else if (!list_empty(&adapter->network_free_list)) {
1779                         /* Pull one from the free list */
1780                         found = list_entry(adapter->network_free_list.next,
1781                                            struct bss_descriptor, list);
1782                         list_move_tail(&found->list, &adapter->network_list);
1783                 } else if (oldest) {
1784                         /* If there are no more slots, expire the oldest */
1785                         found = oldest;
1786                         clear_bss_descriptor(found);
1787                         list_move_tail(&found->list, &adapter->network_list);
1788                 } else {
1789                         continue;
1790                 }
1791
1792                 lbs_deb_scan("SCAN_RESP: BSSID = " MAC_FMT "\n",
1793                        new.bssid[0], new.bssid[1], new.bssid[2],
1794                        new.bssid[3], new.bssid[4], new.bssid[5]);
1795
1796                 /*
1797                  * If the TSF TLV was appended to the scan results, save the
1798                  *   this entries TSF value in the networktsf field.  The
1799                  *   networktsf is the firmware's TSF value at the time the
1800                  *   beacon or probe response was received.
1801                  */
1802                 if (ptsftlv) {
1803                         new.networktsf = le64_to_cpup(&ptsftlv->tsftable[idx]);
1804                 }
1805
1806                 /* Copy the locally created newbssentry to the scan table */
1807                 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1808         }
1809
1810         ret = 0;
1811
1812 done:
1813         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1814         return ret;
1815 }