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

   1 /**
   2   * Functions implementing wlan scan IOCTL and firmware command APIs
   3   *
   4   * IOCTL handlers as well as command preperation and response routines
   5   *  for sending scan commands to the firmware.
   6   */
   7 #include <linux/ctype.h>
   8 #include <linux/if.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/wireless.h>
  11 #include <linux/etherdevice.h>
  12
  13 #include <net/ieee80211.h>
  14 #include <net/iw_handler.h>
  15
  16 #include <asm/unaligned.h>
  17
  18 #include "host.h"
  19 #include "decl.h"
  20 #include "dev.h"
  21 #include "scan.h"
  22 #include "join.h"
  23
  24 //! Approximate amount of data needed to pass a scan result back to iwlist
  25 #define MAX_SCAN_CELL_SIZE  (IW_EV_ADDR_LEN             \
  26                              + IW_ESSID_MAX_SIZE        \
  27                              + IW_EV_UINT_LEN           \
  28                              + IW_EV_FREQ_LEN           \
  29                              + IW_EV_QUAL_LEN           \
  30                              + IW_ESSID_MAX_SIZE        \
  31                              + IW_EV_PARAM_LEN          \
  32                              + 40)      /* 40 for WPAIE */
  33
  34 //! Memory needed to store a max sized channel List TLV for a firmware scan
  35 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mrvlietypesheader)    \
  36                             + (MRVDRV_MAX_CHANNELS_PER_SCAN     \
  37                                * sizeof(struct chanscanparamset)))
  38
  39 //! Memory needed to store a max number/size SSID TLV for a firmware scan
  40 #define SSID_TLV_MAX_SIZE  (1 * sizeof(struct mrvlietypes_ssidparamset))
  41
  42 //! Maximum memory needed for a lbs_scan_cmd_config with all TLVs at max
  43 #define MAX_SCAN_CFG_ALLOC (sizeof(struct lbs_scan_cmd_config)  \
  44                             + sizeof(struct mrvlietypes_numprobes)   \
  45                             + CHAN_TLV_MAX_SIZE                 \
  46                             + SSID_TLV_MAX_SIZE)
  47
  48 //! The maximum number of channels the firmware can scan per command
  49 #define MRVDRV_MAX_CHANNELS_PER_SCAN   14
  50
  51 /**
  52  * @brief Number of channels to scan per firmware scan command issuance.
  53  *
  54  *  Number restricted to prevent hitting the limit on the amount of scan data
  55  *  returned in a single firmware scan command.
  56  */
  57 #define MRVDRV_CHANNELS_PER_SCAN_CMD   4
  58
  59 //! Scan time specified in the channel TLV for each channel for passive scans
  60 #define MRVDRV_PASSIVE_SCAN_CHAN_TIME  100
  61
  62 //! Scan time specified in the channel TLV for each channel for active scans
  63 #define MRVDRV_ACTIVE_SCAN_CHAN_TIME   100
  64
  65 static const u8 zeromac[ETH_ALEN] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
  66 static const u8 bcastmac[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  67
  68
  69
  70
  71 /*********************************************************************/
  72 /*                                                                   */
  73 /*  Misc helper functions                                            */
  74 /*                                                                   */
  75 /*********************************************************************/
  76
  77 static inline void clear_bss_descriptor (struct bss_descriptor * bss)
  78 {
  79         /* Don't blow away ->list, just BSS data */
  80         memset(bss, 0, offsetof(struct bss_descriptor, list));
  81 }
  82
  83 static inline int match_bss_no_security(struct lbs_802_11_security *secinfo,
  84                         struct bss_descriptor * match_bss)
  85 {
  86         if (   !secinfo->wep_enabled
  87             && !secinfo->WPAenabled
  88             && !secinfo->WPA2enabled
  89             && match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC
  90             && match_bss->rsn_ie[0] != MFIE_TYPE_RSN
  91             && !(match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
  92                 return 1;
  93         }
  94         return 0;
  95 }
  96
  97 static inline int match_bss_static_wep(struct lbs_802_11_security *secinfo,
  98                         struct bss_descriptor * match_bss)
  99 {
 100         if ( secinfo->wep_enabled
 101            && !secinfo->WPAenabled
 102            && !secinfo->WPA2enabled
 103            && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 104                 return 1;
 105         }
 106         return 0;
 107 }
 108
 109 static inline int match_bss_wpa(struct lbs_802_11_security *secinfo,
 110                         struct bss_descriptor * match_bss)
 111 {
 112         if (  !secinfo->wep_enabled
 113            && secinfo->WPAenabled
 114            && (match_bss->wpa_ie[0] == MFIE_TYPE_GENERIC)
 115            /* privacy bit may NOT be set in some APs like LinkSys WRT54G
 116               && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 117             */
 118            ) {
 119                 return 1;
 120         }
 121         return 0;
 122 }
 123
 124 static inline int match_bss_wpa2(struct lbs_802_11_security *secinfo,
 125                         struct bss_descriptor * match_bss)
 126 {
 127         if (  !secinfo->wep_enabled
 128            && secinfo->WPA2enabled
 129            && (match_bss->rsn_ie[0] == MFIE_TYPE_RSN)
 130            /* privacy bit may NOT be set in some APs like LinkSys WRT54G
 131               && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 132             */
 133            ) {
 134                 return 1;
 135         }
 136         return 0;
 137 }
 138
 139 static inline int match_bss_dynamic_wep(struct lbs_802_11_security *secinfo,
 140                         struct bss_descriptor * match_bss)
 141 {
 142         if (  !secinfo->wep_enabled
 143            && !secinfo->WPAenabled
 144            && !secinfo->WPA2enabled
 145            && (match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC)
 146            && (match_bss->rsn_ie[0] != MFIE_TYPE_RSN)
 147            && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 148                 return 1;
 149         }
 150         return 0;
 151 }
 152
 153 /**
 154  *  @brief Check if a scanned network compatible with the driver settings
 155  *
 156  *   WEP     WPA     WPA2    ad-hoc  encrypt                      Network
 157  * enabled enabled  enabled   AES     mode   privacy  WPA  WPA2  Compatible
 158  *    0       0        0       0      NONE      0      0    0   yes No security
 159  *    1       0        0       0      NONE      1      0    0   yes Static WEP
 160  *    0       1        0       0       x        1x     1    x   yes WPA
 161  *    0       0        1       0       x        1x     x    1   yes WPA2
 162  *    0       0        0       1      NONE      1      0    0   yes Ad-hoc AES
 163  *    0       0        0       0     !=NONE     1      0    0   yes Dynamic WEP
 164  *
 165  *
 166  *  @param adapter A pointer to lbs_adapter
 167  *  @param index   Index in scantable to check against current driver settings
 168  *  @param mode    Network mode: Infrastructure or IBSS
 169  *
 170  *  @return        Index in scantable, or error code if negative
 171  */
 172 static int is_network_compatible(lbs_adapter *adapter,
 173                 struct bss_descriptor * bss, u8 mode)
 174 {
 175         int matched = 0;
 176
 177         lbs_deb_enter(LBS_DEB_SCAN);
 178
 179         if (bss->mode != mode)
 180                 goto done;
 181
 182         if ((matched = match_bss_no_security(&adapter->secinfo, bss))) {
 183                 goto done;
 184         } else if ((matched = match_bss_static_wep(&adapter->secinfo, bss))) {
 185                 goto done;
 186         } else if ((matched = match_bss_wpa(&adapter->secinfo, bss))) {
 187                 lbs_deb_scan(
 188                        "is_network_compatible() WPA: wpa_ie=%#x "
 189                        "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 190                        "privacy=%#x\n", bss->wpa_ie[0], bss->rsn_ie[0],
 191                        adapter->secinfo.wep_enabled ? "e" : "d",
 192                        adapter->secinfo.WPAenabled ? "e" : "d",
 193                        adapter->secinfo.WPA2enabled ? "e" : "d",
 194                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
 195                 goto done;
 196         } else if ((matched = match_bss_wpa2(&adapter->secinfo, bss))) {
 197                 lbs_deb_scan(
 198                        "is_network_compatible() WPA2: wpa_ie=%#x "
 199                        "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 200                        "privacy=%#x\n", bss->wpa_ie[0], bss->rsn_ie[0],
 201                        adapter->secinfo.wep_enabled ? "e" : "d",
 202                        adapter->secinfo.WPAenabled ? "e" : "d",
 203                        adapter->secinfo.WPA2enabled ? "e" : "d",
 204                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
 205                 goto done;
 206         } else if ((matched = match_bss_dynamic_wep(&adapter->secinfo, bss))) {
 207                 lbs_deb_scan(
 208                        "is_network_compatible() dynamic WEP: "
 209                        "wpa_ie=%#x wpa2_ie=%#x privacy=%#x\n",
 210                        bss->wpa_ie[0], bss->rsn_ie[0],
 211                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
 212                 goto done;
 213         }
 214
 215         /* bss security settings don't match those configured on card */
 216         lbs_deb_scan(
 217                "is_network_compatible() FAILED: wpa_ie=%#x "
 218                "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s privacy=%#x\n",
 219                bss->wpa_ie[0], bss->rsn_ie[0],
 220                adapter->secinfo.wep_enabled ? "e" : "d",
 221                adapter->secinfo.WPAenabled ? "e" : "d",
 222                adapter->secinfo.WPA2enabled ? "e" : "d",
 223                (bss->capability & WLAN_CAPABILITY_PRIVACY));
 224
 225 done:
 226         lbs_deb_leave_args(LBS_DEB_SCAN, "matched: %d", matched);
 227         return matched;
 228 }
 229
 230 /**
 231  *  @brief Compare two SSIDs
 232  *
 233  *  @param ssid1    A pointer to ssid to compare
 234  *  @param ssid2    A pointer to ssid to compare
 235  *
 236  *  @return         0--ssid is same, otherwise is different
 237  */
 238 int lbs_ssid_cmp(u8 *ssid1, u8 ssid1_len, u8 *ssid2, u8 ssid2_len)
 239 {
 240         if (ssid1_len != ssid2_len)
 241                 return -1;
 242
 243         return memcmp(ssid1, ssid2, ssid1_len);
 244 }
 245
 246
 247
 248
 249 /*********************************************************************/
 250 /*                                                                   */
 251 /*  Main scanning support                                            */
 252 /*                                                                   */
 253 /*********************************************************************/
 254
 255
 256 /**
 257  *  @brief Create a channel list for the driver to scan based on region info
 258  *
 259  *  Only used from lbs_scan_setup_scan_config()
 260  *
 261  *  Use the driver region/band information to construct a comprehensive list
 262  *    of channels to scan.  This routine is used for any scan that is not
 263  *    provided a specific channel list to scan.
 264  *
 265  *  @param priv          A pointer to lbs_private structure
 266  *  @param scanchanlist  Output parameter: resulting channel list to scan
 267  *  @param filteredscan  Flag indicating whether or not a BSSID or SSID filter
 268  *                       is being sent in the command to firmware.  Used to
 269  *                       increase the number of channels sent in a scan
 270  *                       command and to disable the firmware channel scan
 271  *                       filter.
 272  *
 273  *  @return              void
 274  */
 275 static void lbs_scan_create_channel_list(lbs_private *priv,
 276                                           struct chanscanparamset * scanchanlist,
 277                                           u8 filteredscan)
 278 {
 279
 280         lbs_adapter *adapter = priv->adapter;
 281         struct region_channel *scanregion;
 282         struct chan_freq_power *cfp;
 283         int rgnidx;
 284         int chanidx;
 285         int nextchan;
 286         u8 scantype;
 287
 288         lbs_deb_enter_args(LBS_DEB_SCAN, "filteredscan %d", filteredscan);
 289
 290         chanidx = 0;
 291
 292         /* Set the default scan type to the user specified type, will later
 293          *   be changed to passive on a per channel basis if restricted by
 294          *   regulatory requirements (11d or 11h)
 295          */
 296         scantype = CMD_SCAN_TYPE_ACTIVE;
 297
 298         for (rgnidx = 0; rgnidx < ARRAY_SIZE(adapter->region_channel); rgnidx++) {
 299                 if (priv->adapter->enable11d &&
 300                     adapter->connect_status != LBS_CONNECTED) {
 301                         /* Scan all the supported chan for the first scan */
 302                         if (!adapter->universal_channel[rgnidx].valid)
 303                                 continue;
 304                         scanregion = &adapter->universal_channel[rgnidx];
 305
 306                         /* clear the parsed_region_chan for the first scan */
 307                         memset(&adapter->parsed_region_chan, 0x00,
 308                                sizeof(adapter->parsed_region_chan));
 309                 } else {
 310                         if (!adapter->region_channel[rgnidx].valid)
 311                                 continue;
 312                         scanregion = &adapter->region_channel[rgnidx];
 313                 }
 314
 315                 for (nextchan = 0;
 316                      nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
 317
 318                         cfp = scanregion->CFP + nextchan;
 319
 320                         if (priv->adapter->enable11d) {
 321                                 scantype =
 322                                     lbs_get_scan_type_11d(cfp->channel,
 323                                                            &adapter->
 324                                                            parsed_region_chan);
 325                         }
 326
 327                         switch (scanregion->band) {
 328                         case BAND_B:
 329                         case BAND_G:
 330                         default:
 331                                 scanchanlist[chanidx].radiotype =
 332                                     CMD_SCAN_RADIO_TYPE_BG;
 333                                 break;
 334                         }
 335
 336                         if (scantype == CMD_SCAN_TYPE_PASSIVE) {
 337                                 scanchanlist[chanidx].maxscantime =
 338                                     cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
 339                                 scanchanlist[chanidx].chanscanmode.passivescan =
 340                                     1;
 341                         } else {
 342                                 scanchanlist[chanidx].maxscantime =
 343                                     cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
 344                                 scanchanlist[chanidx].chanscanmode.passivescan =
 345                                     0;
 346                         }
 347
 348                         scanchanlist[chanidx].channumber = cfp->channel;
 349
 350                         if (filteredscan) {
 351                                 scanchanlist[chanidx].chanscanmode.
 352                                     disablechanfilt = 1;
 353                         }
 354                 }
 355         }
 356 }
 357
 358
 359 /* Delayed partial scan worker */
 360 void lbs_scan_worker(struct work_struct *work)
 361 {
 362         lbs_private *priv = container_of(work, lbs_private, scan_work.work);
 363
 364         lbs_scan_networks(priv, NULL, 0);
 365 }
 366
 367
 368 /**
 369  *  @brief Construct a lbs_scan_cmd_config structure to use in issue scan cmds
 370  *
 371  *  Application layer or other functions can invoke lbs_scan_networks
 372  *    with a scan configuration supplied in a lbs_ioctl_user_scan_cfg struct.
 373  *    This structure is used as the basis of one or many lbs_scan_cmd_config
 374  *    commands that are sent to the command processing module and sent to
 375  *    firmware.
 376  *
 377  *  Create a lbs_scan_cmd_config based on the following user supplied
 378  *    parameters (if present):
 379  *             - SSID filter
 380  *             - BSSID filter
 381  *             - Number of Probes to be sent
 382  *             - channel list
 383  *
 384  *  If the SSID or BSSID filter is not present, disable/clear the filter.
 385  *  If the number of probes is not set, use the adapter default setting
 386  *  Qualify the channel
 387  *
 388  *  @param priv             A pointer to lbs_private structure
 389  *  @param puserscanin      NULL or pointer to scan configuration parameters
 390  *  @param ppchantlvout     Output parameter: Pointer to the start of the
 391  *                          channel TLV portion of the output scan config
 392  *  @param pscanchanlist    Output parameter: Pointer to the resulting channel
 393  *                          list to scan
 394  *  @param pmaxchanperscan  Output parameter: Number of channels to scan for
 395  *                          each issuance of the firmware scan command
 396  *  @param pfilteredscan    Output parameter: Flag indicating whether or not
 397  *                          a BSSID or SSID filter is being sent in the
 398  *                          command to firmware.  Used to increase the number
 399  *                          of channels sent in a scan command and to
 400  *                          disable the firmware channel scan filter.
 401  *  @param pscancurrentonly Output parameter: Flag indicating whether or not
 402  *                          we are only scanning our current active channel
 403  *
 404  *  @return                 resulting scan configuration
 405  */
 406 static struct lbs_scan_cmd_config *
 407 lbs_scan_setup_scan_config(lbs_private *priv,
 408                             const struct lbs_ioctl_user_scan_cfg *puserscanin,
 409                             struct mrvlietypes_chanlistparamset ** ppchantlvout,
 410                             struct chanscanparamset * pscanchanlist,
 411                             int *pmaxchanperscan,
 412                             u8 * pfilteredscan,
 413                             u8 * pscancurrentonly)
 414 {
 415         struct mrvlietypes_numprobes *pnumprobestlv;
 416         struct mrvlietypes_ssidparamset *pssidtlv;
 417         struct lbs_scan_cmd_config *pscancfgout = NULL;
 418         u8 *ptlvpos;
 419         u16 numprobes;
 420         int chanidx;
 421         int scantype;
 422         int scandur;
 423         int channel;
 424         int radiotype;
 425
 426         lbs_deb_enter(LBS_DEB_SCAN);
 427
 428         pscancfgout = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
 429         if (pscancfgout == NULL)
 430                 goto out;
 431
 432         /* The tlvbufferlen is calculated for each scan command.  The TLVs added
 433          *   in this routine will be preserved since the routine that sends
 434          *   the command will append channelTLVs at *ppchantlvout.  The difference
 435          *   between the *ppchantlvout and the tlvbuffer start will be used
 436          *   to calculate the size of anything we add in this routine.
 437          */
 438         pscancfgout->tlvbufferlen = 0;
 439
 440         /* Running tlv pointer.  Assigned to ppchantlvout at end of function
 441          *  so later routines know where channels can be added to the command buf
 442          */
 443         ptlvpos = pscancfgout->tlvbuffer;
 444
 445         /*
 446          * Set the initial scan paramters for progressive scanning.  If a specific
 447          *   BSSID or SSID is used, the number of channels in the scan command
 448          *   will be increased to the absolute maximum
 449          */
 450         *pmaxchanperscan = MRVDRV_CHANNELS_PER_SCAN_CMD;
 451
 452         /* Initialize the scan as un-filtered by firmware, set to TRUE below if
 453          *   a SSID or BSSID filter is sent in the command
 454          */
 455         *pfilteredscan = 0;
 456
 457         /* Initialize the scan as not being only on the current channel.  If
 458          *   the channel list is customized, only contains one channel, and
 459          *   is the active channel, this is set true and data flow is not halted.
 460          */
 461         *pscancurrentonly = 0;
 462
 463         if (puserscanin) {
 464                 /* Set the bss type scan filter, use adapter setting if unset */
 465                 pscancfgout->bsstype =
 466                     puserscanin->bsstype ? puserscanin->bsstype : CMD_BSS_TYPE_ANY;
 467
 468                 /* Set the number of probes to send, use adapter setting if unset */
 469                 numprobes = puserscanin->numprobes ? puserscanin->numprobes : 0;
 470
 471                 /*
 472                  * Set the BSSID filter to the incoming configuration,
 473                  *   if non-zero.  If not set, it will remain disabled (all zeros).
 474                  */
 475                 memcpy(pscancfgout->bssid, puserscanin->bssid,
 476                        sizeof(pscancfgout->bssid));
 477
 478                 if (puserscanin->ssid_len) {
 479                         pssidtlv =
 480                             (struct mrvlietypes_ssidparamset *) pscancfgout->
 481                             tlvbuffer;
 482                         pssidtlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
 483                         pssidtlv->header.len = cpu_to_le16(puserscanin->ssid_len);
 484                         memcpy(pssidtlv->ssid, puserscanin->ssid,
 485                                puserscanin->ssid_len);
 486                         ptlvpos += sizeof(pssidtlv->header) + puserscanin->ssid_len;
 487                 }
 488
 489                 /*
 490                  *  The default number of channels sent in the command is low to
 491                  *    ensure the response buffer from the firmware does not truncate
 492                  *    scan results.  That is not an issue with an SSID or BSSID
 493                  *    filter applied to the scan results in the firmware.
 494                  */
 495                 if (   puserscanin->ssid_len
 496                     || (compare_ether_addr(pscancfgout->bssid, &zeromac[0]) != 0)) {
 497                         *pmaxchanperscan = MRVDRV_MAX_CHANNELS_PER_SCAN;
 498                         *pfilteredscan = 1;
 499                 }
 500         } else {
 501                 pscancfgout->bsstype = CMD_BSS_TYPE_ANY;
 502                 numprobes = 0;
 503         }
 504
 505         /* If the input config or adapter has the number of Probes set, add tlv */
 506         if (numprobes) {
 507                 pnumprobestlv = (struct mrvlietypes_numprobes *) ptlvpos;
 508                 pnumprobestlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 509                 pnumprobestlv->header.len = cpu_to_le16(2);
 510                 pnumprobestlv->numprobes = cpu_to_le16(numprobes);
 511
 512                 ptlvpos += sizeof(*pnumprobestlv);
 513         }
 514
 515         /*
 516          * Set the output for the channel TLV to the address in the tlv buffer
 517          *   past any TLVs that were added in this fuction (SSID, numprobes).
 518          *   channel TLVs will be added past this for each scan command, preserving
 519          *   the TLVs that were previously added.
 520          */
 521         *ppchantlvout = (struct mrvlietypes_chanlistparamset *) ptlvpos;
 522
 523         if (!puserscanin || !puserscanin->chanlist[0].channumber) {
 524                 /* Create a default channel scan list */
 525                 lbs_deb_scan("creating full region channel list\n");
 526                 lbs_scan_create_channel_list(priv, pscanchanlist,
 527                                               *pfilteredscan);
 528                 goto out;
 529         }
 530
 531         for (chanidx = 0;
 532              chanidx < LBS_IOCTL_USER_SCAN_CHAN_MAX
 533              && puserscanin->chanlist[chanidx].channumber; chanidx++) {
 534
 535                 channel = puserscanin->chanlist[chanidx].channumber;
 536                 (pscanchanlist + chanidx)->channumber = channel;
 537
 538                 radiotype = puserscanin->chanlist[chanidx].radiotype;
 539                 (pscanchanlist + chanidx)->radiotype = radiotype;
 540
 541                 scantype = puserscanin->chanlist[chanidx].scantype;
 542
 543                 if (scantype == CMD_SCAN_TYPE_PASSIVE) {
 544                         (pscanchanlist +
 545                          chanidx)->chanscanmode.passivescan = 1;
 546                 } else {
 547                         (pscanchanlist +
 548                          chanidx)->chanscanmode.passivescan = 0;
 549                 }
 550
 551                 if (puserscanin->chanlist[chanidx].scantime) {
 552                         scandur = puserscanin->chanlist[chanidx].scantime;
 553                 } else {
 554                         if (scantype == CMD_SCAN_TYPE_PASSIVE) {
 555                                 scandur = MRVDRV_PASSIVE_SCAN_CHAN_TIME;
 556                         } else {
 557                                 scandur = MRVDRV_ACTIVE_SCAN_CHAN_TIME;
 558                         }
 559                 }
 560
 561                 (pscanchanlist + chanidx)->minscantime =
 562                     cpu_to_le16(scandur);
 563                 (pscanchanlist + chanidx)->maxscantime =
 564                     cpu_to_le16(scandur);
 565         }
 566
 567         /* Check if we are only scanning the current channel */
 568         if ((chanidx == 1) &&
 569             (puserscanin->chanlist[0].channumber ==
 570                                priv->adapter->curbssparams.channel)) {
 571                 *pscancurrentonly = 1;
 572                 lbs_deb_scan("scanning current channel only");
 573         }
 574
 575 out:
 576         return pscancfgout;
 577 }
 578
 579 /**
 580  *  @brief Construct and send multiple scan config commands to the firmware
 581  *
 582  *  Only used from lbs_scan_networks()
 583  *
 584  *  Previous routines have created a lbs_scan_cmd_config with any requested
 585  *   TLVs.  This function splits the channel TLV into maxchanperscan lists
 586  *   and sends the portion of the channel TLV along with the other TLVs
 587  *   to the lbs_cmd routines for execution in the firmware.
 588  *
 589  *  @param priv            A pointer to lbs_private structure
 590  *  @param maxchanperscan  Maximum number channels to be included in each
 591  *                         scan command sent to firmware
 592  *  @param filteredscan    Flag indicating whether or not a BSSID or SSID
 593  *                         filter is being used for the firmware command
 594  *                         scan command sent to firmware
 595  *  @param pscancfgout     Scan configuration used for this scan.
 596  *  @param pchantlvout     Pointer in the pscancfgout where the channel TLV
 597  *                         should start.  This is past any other TLVs that
 598  *                         must be sent down in each firmware command.
 599  *  @param pscanchanlist   List of channels to scan in maxchanperscan segments
 600  *
 601  *  @return                0 or error return otherwise
 602  */
 603 static int lbs_scan_channel_list(lbs_private *priv,
 604                                   int maxchanperscan,
 605                                   u8 filteredscan,
 606                                   struct lbs_scan_cmd_config *pscancfgout,
 607                                   struct mrvlietypes_chanlistparamset * pchantlvout,
 608                                   struct chanscanparamset * pscanchanlist,
 609                                   const struct lbs_ioctl_user_scan_cfg *puserscanin,
 610                                   int full_scan)
 611 {
 612         struct chanscanparamset *ptmpchan;
 613         struct chanscanparamset *pstartchan;
 614         u8 scanband;
 615         int doneearly;
 616         int tlvidx;
 617         int ret = 0;
 618         int scanned = 0;
 619         union iwreq_data wrqu;
 620
 621         lbs_deb_enter_args(LBS_DEB_SCAN, "maxchanperscan %d, filteredscan %d, "
 622                 "full_scan %d", maxchanperscan, filteredscan, full_scan);
 623
 624         if (!pscancfgout || !pchantlvout || !pscanchanlist) {
 625                 lbs_deb_scan("pscancfgout, pchantlvout or "
 626                         "pscanchanlist is NULL\n");
 627                 ret = -1;
 628                 goto out;
 629         }
 630
 631         pchantlvout->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 632
 633         /* Set the temp channel struct pointer to the start of the desired list */
 634         ptmpchan = pscanchanlist;
 635
 636         if (priv->adapter->last_scanned_channel && !puserscanin)
 637                 ptmpchan += priv->adapter->last_scanned_channel;
 638
 639         /* Loop through the desired channel list, sending a new firmware scan
 640          *   commands for each maxchanperscan channels (or for 1,6,11 individually
 641          *   if configured accordingly)
 642          */
 643         while (ptmpchan->channumber) {
 644
 645                 tlvidx = 0;
 646                 pchantlvout->header.len = 0;
 647                 scanband = ptmpchan->radiotype;
 648                 pstartchan = ptmpchan;
 649                 doneearly = 0;
 650
 651                 /* Construct the channel TLV for the scan command.  Continue to
 652                  *  insert channel TLVs until:
 653                  *    - the tlvidx hits the maximum configured per scan command
 654                  *    - the next channel to insert is 0 (end of desired channel list)
 655                  *    - doneearly is set (controlling individual scanning of 1,6,11)
 656                  */
 657                 while (tlvidx < maxchanperscan && ptmpchan->channumber
 658                        && !doneearly && scanned < 2) {
 659
 660                         lbs_deb_scan("channel %d, radio %d, passive %d, "
 661                                 "dischanflt %d, maxscantime %d\n",
 662                                 ptmpchan->channumber,
 663                                 ptmpchan->radiotype,
 664                                      ptmpchan->chanscanmode.passivescan,
 665                                      ptmpchan->chanscanmode.disablechanfilt,
 666                                      ptmpchan->maxscantime);
 667
 668                         /* Copy the current channel TLV to the command being prepared */
 669                         memcpy(pchantlvout->chanscanparam + tlvidx,
 670                                ptmpchan, sizeof(pchantlvout->chanscanparam));
 671
 672                         /* Increment the TLV header length by the size appended */
 673                         /* Ew, it would be _so_ nice if we could just declare the
 674                            variable little-endian and let GCC handle it for us */
 675                         pchantlvout->header.len =
 676                                 cpu_to_le16(le16_to_cpu(pchantlvout->header.len) +
 677                                             sizeof(pchantlvout->chanscanparam));
 678
 679                         /*
 680                          *  The tlv buffer length is set to the number of bytes of the
 681                          *    between the channel tlv pointer and the start of the
 682                          *    tlv buffer.  This compensates for any TLVs that were appended
 683                          *    before the channel list.
 684                          */
 685                         pscancfgout->tlvbufferlen = ((u8 *) pchantlvout
 686                                                      - pscancfgout->tlvbuffer);
 687
 688                         /*  Add the size of the channel tlv header and the data length */
 689                         pscancfgout->tlvbufferlen +=
 690                             (sizeof(pchantlvout->header)
 691                              + le16_to_cpu(pchantlvout->header.len));
 692
 693                         /* Increment the index to the channel tlv we are constructing */
 694                         tlvidx++;
 695
 696                         doneearly = 0;
 697
 698                         /* Stop the loop if the *current* channel is in the 1,6,11 set
 699                          *   and we are not filtering on a BSSID or SSID.
 700                          */
 701                         if (!filteredscan && (ptmpchan->channumber == 1
 702                                               || ptmpchan->channumber == 6
 703                                               || ptmpchan->channumber == 11)) {
 704                                 doneearly = 1;
 705                         }
 706
 707                         /* Increment the tmp pointer to the next channel to be scanned */
 708                         ptmpchan++;
 709                         scanned++;
 710
 711                         /* Stop the loop if the *next* channel is in the 1,6,11 set.
 712                          *  This will cause it to be the only channel scanned on the next
 713                          *  interation
 714                          */
 715                         if (!filteredscan && (ptmpchan->channumber == 1
 716                                               || ptmpchan->channumber == 6
 717                                               || ptmpchan->channumber == 11)) {
 718                                 doneearly = 1;
 719                         }
 720                 }
 721
 722                 /* Send the scan command to the firmware with the specified cfg */
 723                 ret = lbs_prepare_and_send_command(priv, CMD_802_11_SCAN, 0,
 724                                             0, 0, pscancfgout);
 725                 if (scanned >= 2 && !full_scan) {
 726                         ret = 0;
 727                         goto done;
 728                 }
 729                 scanned = 0;
 730         }
 731
 732 done:
 733         priv->adapter->last_scanned_channel = ptmpchan->channumber;
 734
 735         if (priv->adapter->last_scanned_channel) {
 736                 /* Schedule the next part of the partial scan */
 737                 if (!full_scan && !priv->adapter->surpriseremoved) {
 738                         cancel_delayed_work(&priv->scan_work);
 739                         queue_delayed_work(priv->work_thread, &priv->scan_work,
 740                                            msecs_to_jiffies(300));
 741                 }
 742         } else {
 743                 /* All done, tell userspace the scan table has been updated */
 744                 memset(&wrqu, 0, sizeof(union iwreq_data));
 745                 wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
 746         }
 747
 748 out:
 749         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 750         return ret;
 751 }
 752
 753 /*
 754  * Only used from lbs_scan_networks()
 755 */
 756 static void clear_selected_scan_list_entries(lbs_adapter *adapter,
 757         const struct lbs_ioctl_user_scan_cfg *scan_cfg)
 758 {
 759         struct bss_descriptor *bss;
 760         struct bss_descriptor *safe;
 761         u32 clear_ssid_flag = 0, clear_bssid_flag = 0;
 762
 763         lbs_deb_enter(LBS_DEB_SCAN);
 764
 765         if (!scan_cfg)
 766                 goto out;
 767
 768         if (scan_cfg->clear_ssid && scan_cfg->ssid_len)
 769                 clear_ssid_flag = 1;
 770
 771         if (scan_cfg->clear_bssid
 772             && (compare_ether_addr(scan_cfg->bssid, &zeromac[0]) != 0)
 773             && (compare_ether_addr(scan_cfg->bssid, &bcastmac[0]) != 0)) {
 774                 clear_bssid_flag = 1;
 775         }
 776
 777         if (!clear_ssid_flag && !clear_bssid_flag)
 778                 goto out;
 779
 780         mutex_lock(&adapter->lock);
 781         list_for_each_entry_safe (bss, safe, &adapter->network_list, list) {
 782                 u32 clear = 0;
 783
 784                 /* Check for an SSID match */
 785                 if (   clear_ssid_flag
 786                     && (bss->ssid_len == scan_cfg->ssid_len)
 787                     && !memcmp(bss->ssid, scan_cfg->ssid, bss->ssid_len))
 788                         clear = 1;
 789
 790                 /* Check for a BSSID match */
 791                 if (   clear_bssid_flag
 792                     && !compare_ether_addr(bss->bssid, scan_cfg->bssid))
 793                         clear = 1;
 794
 795                 if (clear) {
 796                         list_move_tail (&bss->list, &adapter->network_free_list);
 797                         clear_bss_descriptor(bss);
 798                 }
 799         }
 800         mutex_unlock(&adapter->lock);
 801 out:
 802         lbs_deb_leave(LBS_DEB_SCAN);
 803 }
 804
 805
 806 /**
 807  *  @brief Internal function used to start a scan based on an input config
 808  *
 809  *  Also used from debugfs
 810  *
 811  *  Use the input user scan configuration information when provided in
 812  *    order to send the appropriate scan commands to firmware to populate or
 813  *    update the internal driver scan table
 814  *
 815  *  @param priv          A pointer to lbs_private structure
 816  *  @param puserscanin   Pointer to the input configuration for the requested
 817  *                       scan.
 818  *  @param full_scan     ???
 819  *
 820  *  @return              0 or < 0 if error
 821  */
 822 int lbs_scan_networks(lbs_private *priv,
 823         const struct lbs_ioctl_user_scan_cfg *puserscanin,
 824                        int full_scan)
 825 {
 826         lbs_adapter *adapter = priv->adapter;
 827         struct mrvlietypes_chanlistparamset *pchantlvout;
 828         struct chanscanparamset * scan_chan_list = NULL;
 829         struct lbs_scan_cmd_config *scan_cfg = NULL;
 830         u8 filteredscan;
 831         u8 scancurrentchanonly;
 832         int maxchanperscan;
 833         int ret;
 834 #ifdef CONFIG_LIBERTAS_DEBUG
 835         struct bss_descriptor * iter_bss;
 836         int i = 0;
 837         DECLARE_MAC_BUF(mac);
 838 #endif
 839
 840         lbs_deb_enter_args(LBS_DEB_SCAN, "full_scan %d", full_scan);
 841
 842         /* Cancel any partial outstanding partial scans if this scan
 843          * is a full scan.
 844          */
 845         if (full_scan && delayed_work_pending(&priv->scan_work))
 846                 cancel_delayed_work(&priv->scan_work);
 847
 848         scan_chan_list = kzalloc(sizeof(struct chanscanparamset) *
 849                                 LBS_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
 850         if (scan_chan_list == NULL) {
 851                 ret = -ENOMEM;
 852                 goto out;
 853         }
 854
 855         scan_cfg = lbs_scan_setup_scan_config(priv,
 856                                                puserscanin,
 857                                                &pchantlvout,
 858                                                scan_chan_list,
 859                                                &maxchanperscan,
 860                                                &filteredscan,
 861                                                &scancurrentchanonly);
 862         if (scan_cfg == NULL) {
 863                 ret = -ENOMEM;
 864                 goto out;
 865         }
 866
 867         clear_selected_scan_list_entries(adapter, puserscanin);
 868
 869         /* Keep the data path active if we are only scanning our current channel */
 870         if (!scancurrentchanonly) {
 871                 netif_stop_queue(priv->dev);
 872                 netif_carrier_off(priv->dev);
 873                 if (priv->mesh_dev) {
 874                         netif_stop_queue(priv->mesh_dev);
 875                         netif_carrier_off(priv->mesh_dev);
 876                 }
 877         }
 878
 879         ret = lbs_scan_channel_list(priv,
 880                                      maxchanperscan,
 881                                      filteredscan,
 882                                      scan_cfg,
 883                                      pchantlvout,
 884                                      scan_chan_list,
 885                                      puserscanin,
 886                                      full_scan);
 887
 888 #ifdef CONFIG_LIBERTAS_DEBUG
 889         /* Dump the scan table */
 890         mutex_lock(&adapter->lock);
 891         lbs_deb_scan("The scan table contains:\n");
 892         list_for_each_entry (iter_bss, &adapter->network_list, list) {
 893                 lbs_deb_scan("scan %02d, %s, RSSI, %d, SSID '%s'\n",
 894                        i++, print_mac(mac, iter_bss->bssid), (s32) iter_bss->rssi,
 895                        escape_essid(iter_bss->ssid, iter_bss->ssid_len));
 896         }
 897         mutex_unlock(&adapter->lock);
 898 #endif
 899
 900         if (priv->adapter->connect_status == LBS_CONNECTED) {
 901                 netif_carrier_on(priv->dev);
 902                 netif_wake_queue(priv->dev);
 903                 if (priv->mesh_dev) {
 904                         netif_carrier_on(priv->mesh_dev);
 905                         netif_wake_queue(priv->mesh_dev);
 906                 }
 907         }
 908
 909 out:
 910         if (scan_cfg)
 911                 kfree(scan_cfg);
 912
 913         if (scan_chan_list)
 914                 kfree(scan_chan_list);
 915
 916         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 917         return ret;
 918 }
 919
 920 /**
 921  *  @brief Interpret a BSS scan response returned from the firmware
 922  *
 923  *  Parse the various fixed fields and IEs passed back for a a BSS probe
 924  *   response or beacon from the scan command.  Record information as needed
 925  *   in the scan table struct bss_descriptor for that entry.
 926  *
 927  *  @param bss  Output parameter: Pointer to the BSS Entry
 928  *
 929  *  @return             0 or -1
 930  */
 931 static int lbs_process_bss(struct bss_descriptor *bss,
 932                                 u8 ** pbeaconinfo, int *bytesleft)
 933 {
 934         struct ieeetypes_fhparamset *pFH;
 935         struct ieeetypes_dsparamset *pDS;
 936         struct ieeetypes_cfparamset *pCF;
 937         struct ieeetypes_ibssparamset *pibss;
 938         DECLARE_MAC_BUF(mac);
 939         struct ieeetypes_countryinfoset *pcountryinfo;
 940         u8 *pos, *end, *p;
 941         u8 n_ex_rates = 0, got_basic_rates = 0, n_basic_rates = 0;
 942         u16 beaconsize = 0;
 943         int ret;
 944
 945         lbs_deb_enter(LBS_DEB_SCAN);
 946
 947         if (*bytesleft >= sizeof(beaconsize)) {
 948                 /* Extract & convert beacon size from the command buffer */
 949                 beaconsize = le16_to_cpu(get_unaligned((u16 *)*pbeaconinfo));
 950                 *bytesleft -= sizeof(beaconsize);
 951                 *pbeaconinfo += sizeof(beaconsize);
 952         }
 953
 954         if (beaconsize == 0 || beaconsize > *bytesleft) {
 955                 *pbeaconinfo += *bytesleft;
 956                 *bytesleft = 0;
 957                 ret = -1;
 958                 goto done;
 959         }
 960
 961         /* Initialize the current working beacon pointer for this BSS iteration */
 962         pos = *pbeaconinfo;
 963         end = pos + beaconsize;
 964
 965         /* Advance the return beacon pointer past the current beacon */
 966         *pbeaconinfo += beaconsize;
 967         *bytesleft -= beaconsize;
 968
 969         memcpy(bss->bssid, pos, ETH_ALEN);
 970         lbs_deb_scan("process_bss: AP BSSID %s\n", print_mac(mac, bss->bssid));
 971         pos += ETH_ALEN;
 972
 973         if ((end - pos) < 12) {
 974                 lbs_deb_scan("process_bss: Not enough bytes left\n");
 975                 ret = -1;
 976                 goto done;
 977         }
 978
 979         /*
 980          * next 4 fields are RSSI, time stamp, beacon interval,
 981          *   and capability information
 982          */
 983
 984         /* RSSI is 1 byte long */
 985         bss->rssi = *pos;
 986         lbs_deb_scan("process_bss: RSSI=%02X\n", *pos);
 987         pos++;
 988
 989         /* time stamp is 8 bytes long */
 990         pos += 8;
 991
 992         /* beacon interval is 2 bytes long */
 993         bss->beaconperiod = le16_to_cpup((void *) pos);
 994         pos += 2;
 995
 996         /* capability information is 2 bytes long */
 997         bss->capability = le16_to_cpup((void *) pos);
 998         lbs_deb_scan("process_bss: capabilities = 0x%4X\n", bss->capability);
 999         pos += 2;
1000
1001         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
1002                 lbs_deb_scan("process_bss: AP WEP enabled\n");
1003         if (bss->capability & WLAN_CAPABILITY_IBSS)
1004                 bss->mode = IW_MODE_ADHOC;
1005         else
1006                 bss->mode = IW_MODE_INFRA;
1007
1008         /* rest of the current buffer are IE's */
1009         lbs_deb_scan("process_bss: IE length for this AP = %zd\n", end - pos);
1010         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: IE info", pos, end - pos);
1011
1012         /* process variable IE */
1013         while (pos <= end - 2) {
1014                 struct ieee80211_info_element * elem =
1015                         (struct ieee80211_info_element *) pos;
1016
1017                 if (pos + elem->len > end) {
1018                         lbs_deb_scan("process_bss: error in processing IE, "
1019                                "bytes left < IE length\n");
1020                         break;
1021                 }
1022
1023                 switch (elem->id) {
1024                 case MFIE_TYPE_SSID:
1025                         bss->ssid_len = elem->len;
1026                         memcpy(bss->ssid, elem->data, elem->len);
1027                         lbs_deb_scan("ssid '%s', ssid length %u\n",
1028                                      escape_essid(bss->ssid, bss->ssid_len),
1029                                      bss->ssid_len);
1030                         break;
1031
1032                 case MFIE_TYPE_RATES:
1033                         n_basic_rates = min_t(u8, MAX_RATES, elem->len);
1034                         memcpy(bss->rates, elem->data, n_basic_rates);
1035                         got_basic_rates = 1;
1036                         break;
1037
1038                 case MFIE_TYPE_FH_SET:
1039                         pFH = (struct ieeetypes_fhparamset *) pos;
1040                         memmove(&bss->phyparamset.fhparamset, pFH,
1041                                 sizeof(struct ieeetypes_fhparamset));
1042 #if 0 /* I think we can store these LE */
1043                         bss->phyparamset.fhparamset.dwelltime
1044                             = le16_to_cpu(bss->phyparamset.fhparamset.dwelltime);
1045 #endif
1046                         break;
1047
1048                 case MFIE_TYPE_DS_SET:
1049                         pDS = (struct ieeetypes_dsparamset *) pos;
1050                         bss->channel = pDS->currentchan;
1051                         memcpy(&bss->phyparamset.dsparamset, pDS,
1052                                sizeof(struct ieeetypes_dsparamset));
1053                         break;
1054
1055                 case MFIE_TYPE_CF_SET:
1056                         pCF = (struct ieeetypes_cfparamset *) pos;
1057                         memcpy(&bss->ssparamset.cfparamset, pCF,
1058                                sizeof(struct ieeetypes_cfparamset));
1059                         break;
1060
1061                 case MFIE_TYPE_IBSS_SET:
1062                         pibss = (struct ieeetypes_ibssparamset *) pos;
1063                         bss->atimwindow = le32_to_cpu(pibss->atimwindow);
1064                         memmove(&bss->ssparamset.ibssparamset, pibss,
1065                                 sizeof(struct ieeetypes_ibssparamset));
1066 #if 0
1067                         bss->ssparamset.ibssparamset.atimwindow
1068                             = le16_to_cpu(bss->ssparamset.ibssparamset.atimwindow);
1069 #endif
1070                         break;
1071
1072                 case MFIE_TYPE_COUNTRY:
1073                         pcountryinfo = (struct ieeetypes_countryinfoset *) pos;
1074                         if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
1075                             || pcountryinfo->len > 254) {
1076                                 lbs_deb_scan("process_bss: 11D- Err "
1077                                        "CountryInfo len =%d min=%zd max=254\n",
1078                                        pcountryinfo->len,
1079                                        sizeof(pcountryinfo->countrycode));
1080                                 ret = -1;
1081                                 goto done;
1082                         }
1083
1084                         memcpy(&bss->countryinfo,
1085                                pcountryinfo, pcountryinfo->len + 2);
1086                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: 11d countryinfo",
1087                                 (u8 *) pcountryinfo,
1088                                 (u32) (pcountryinfo->len + 2));
1089                         break;
1090
1091                 case MFIE_TYPE_RATES_EX:
1092                         /* only process extended supported rate if data rate is
1093                          * already found. Data rate IE should come before
1094                          * extended supported rate IE
1095                          */
1096                         if (!got_basic_rates)
1097                                 break;
1098
1099                         n_ex_rates = elem->len;
1100                         if (n_basic_rates + n_ex_rates > MAX_RATES)
1101                                 n_ex_rates = MAX_RATES - n_basic_rates;
1102
1103                         p = bss->rates + n_basic_rates;
1104                         memcpy(p, elem->data, n_ex_rates);
1105                         break;
1106
1107                 case MFIE_TYPE_GENERIC:
1108                         if (elem->len >= 4 &&
1109                             elem->data[0] == 0x00 &&
1110                             elem->data[1] == 0x50 &&
1111                             elem->data[2] == 0xf2 &&
1112                             elem->data[3] == 0x01) {
1113                                 bss->wpa_ie_len = min(elem->len + 2,
1114                                                       MAX_WPA_IE_LEN);
1115                                 memcpy(bss->wpa_ie, elem, bss->wpa_ie_len);
1116                                 lbs_deb_hex(LBS_DEB_SCAN, "process_bss: WPA IE", bss->wpa_ie,
1117                                             elem->len);
1118                         } else if (elem->len >= MARVELL_MESH_IE_LENGTH &&
1119                             elem->data[0] == 0x00 &&
1120                             elem->data[1] == 0x50 &&
1121                             elem->data[2] == 0x43 &&
1122                             elem->data[3] == 0x04) {
1123                                 bss->mesh = 1;
1124                         }
1125                         break;
1126
1127                 case MFIE_TYPE_RSN:
1128                         bss->rsn_ie_len = min(elem->len + 2, MAX_WPA_IE_LEN);
1129                         memcpy(bss->rsn_ie, elem, bss->rsn_ie_len);
1130                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: RSN_IE", bss->rsn_ie, elem->len);
1131                         break;
1132
1133                 default:
1134                         break;
1135                 }
1136
1137                 pos += elem->len + 2;
1138         }
1139
1140         /* Timestamp */
1141         bss->last_scanned = jiffies;
1142         lbs_unset_basic_rate_flags(bss->rates, sizeof(bss->rates));
1143
1144         ret = 0;
1145
1146 done:
1147         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1148         return ret;
1149 }
1150
1151 /**
1152  *  @brief This function finds a specific compatible BSSID in the scan list
1153  *
1154  *  Used in association code
1155  *
1156  *  @param adapter  A pointer to lbs_adapter
1157  *  @param bssid    BSSID to find in the scan list
1158  *  @param mode     Network mode: Infrastructure or IBSS
1159  *
1160  *  @return         index in BSSID list, or error return code (< 0)
1161  */
1162 struct bss_descriptor *lbs_find_bssid_in_list(lbs_adapter *adapter,
1163                 u8 * bssid, u8 mode)
1164 {
1165         struct bss_descriptor * iter_bss;
1166         struct bss_descriptor * found_bss = NULL;
1167
1168         lbs_deb_enter(LBS_DEB_SCAN);
1169
1170         if (!bssid)
1171                 goto out;
1172
1173         lbs_deb_hex(LBS_DEB_SCAN, "looking for",
1174                 bssid, ETH_ALEN);
1175
1176         /* Look through the scan table for a compatible match.  The loop will
1177          *   continue past a matched bssid that is not compatible in case there
1178          *   is an AP with multiple SSIDs assigned to the same BSSID
1179          */
1180         mutex_lock(&adapter->lock);
1181         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1182                 if (compare_ether_addr(iter_bss->bssid, bssid))
1183                         continue; /* bssid doesn't match */
1184                 switch (mode) {
1185                 case IW_MODE_INFRA:
1186                 case IW_MODE_ADHOC:
1187                         if (!is_network_compatible(adapter, iter_bss, mode))
1188                                 break;
1189                         found_bss = iter_bss;
1190                         break;
1191                 default:
1192                         found_bss = iter_bss;
1193                         break;
1194                 }
1195         }
1196         mutex_unlock(&adapter->lock);
1197
1198 out:
1199         lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss);
1200         return found_bss;
1201 }
1202
1203 /**
1204  *  @brief This function finds ssid in ssid list.
1205  *
1206  *  Used in association code
1207  *
1208  *  @param adapter  A pointer to lbs_adapter
1209  *  @param ssid     SSID to find in the list
1210  *  @param bssid    BSSID to qualify the SSID selection (if provided)
1211  *  @param mode     Network mode: Infrastructure or IBSS
1212  *
1213  *  @return         index in BSSID list
1214  */
1215 struct bss_descriptor *lbs_find_ssid_in_list(lbs_adapter *adapter,
1216                    u8 *ssid, u8 ssid_len, u8 * bssid, u8 mode,
1217                    int channel)
1218 {
1219         u8 bestrssi = 0;
1220         struct bss_descriptor * iter_bss = NULL;
1221         struct bss_descriptor * found_bss = NULL;
1222         struct bss_descriptor * tmp_oldest = NULL;
1223
1224         lbs_deb_enter(LBS_DEB_SCAN);
1225
1226         mutex_lock(&adapter->lock);
1227
1228         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1229                 if (   !tmp_oldest
1230                     || (iter_bss->last_scanned < tmp_oldest->last_scanned))
1231                         tmp_oldest = iter_bss;
1232
1233                 if (lbs_ssid_cmp(iter_bss->ssid, iter_bss->ssid_len,
1234                                       ssid, ssid_len) != 0)
1235                         continue; /* ssid doesn't match */
1236                 if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
1237                         continue; /* bssid doesn't match */
1238                 if ((channel > 0) && (iter_bss->channel != channel))
1239                         continue; /* channel doesn't match */
1240
1241                 switch (mode) {
1242                 case IW_MODE_INFRA:
1243                 case IW_MODE_ADHOC:
1244                         if (!is_network_compatible(adapter, iter_bss, mode))
1245                                 break;
1246
1247                         if (bssid) {
1248                                 /* Found requested BSSID */
1249                                 found_bss = iter_bss;
1250                                 goto out;
1251                         }
1252
1253                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1254                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1255                                 found_bss = iter_bss;
1256                         }
1257                         break;
1258                 case IW_MODE_AUTO:
1259                 default:
1260                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1261                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1262                                 found_bss = iter_bss;
1263                         }
1264                         break;
1265                 }
1266         }
1267
1268 out:
1269         mutex_unlock(&adapter->lock);
1270         lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss);
1271         return found_bss;
1272 }
1273
1274 /**
1275  *  @brief This function finds the best SSID in the Scan List
1276  *
1277  *  Search the scan table for the best SSID that also matches the current
1278  *   adapter network preference (infrastructure or adhoc)
1279  *
1280  *  @param adapter  A pointer to lbs_adapter
1281  *
1282  *  @return         index in BSSID list
1283  */
1284 static struct bss_descriptor *lbs_find_best_ssid_in_list(lbs_adapter *adapter,
1285                 u8 mode)
1286 {
1287         u8 bestrssi = 0;
1288         struct bss_descriptor * iter_bss;
1289         struct bss_descriptor * best_bss = NULL;
1290
1291         lbs_deb_enter(LBS_DEB_SCAN);
1292
1293         mutex_lock(&adapter->lock);
1294
1295         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1296                 switch (mode) {
1297                 case IW_MODE_INFRA:
1298                 case IW_MODE_ADHOC:
1299                         if (!is_network_compatible(adapter, iter_bss, mode))
1300                                 break;
1301                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1302                                 break;
1303                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1304                         best_bss = iter_bss;
1305                         break;
1306                 case IW_MODE_AUTO:
1307                 default:
1308                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1309                                 break;
1310                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1311                         best_bss = iter_bss;
1312                         break;
1313                 }
1314         }
1315
1316         mutex_unlock(&adapter->lock);
1317         lbs_deb_leave_args(LBS_DEB_SCAN, "best_bss %p", best_bss);
1318         return best_bss;
1319 }
1320
1321 /**
1322  *  @brief Find the AP with specific ssid in the scan list
1323  *
1324  *  Used from association worker.
1325  *
1326  *  @param priv         A pointer to lbs_private structure
1327  *  @param pSSID        A pointer to AP's ssid
1328  *
1329  *  @return             0--success, otherwise--fail
1330  */
1331 int lbs_find_best_network_ssid(lbs_private *priv,
1332                 u8 *out_ssid, u8 *out_ssid_len, u8 preferred_mode, u8 *out_mode)
1333 {
1334         lbs_adapter *adapter = priv->adapter;
1335         int ret = -1;
1336         struct bss_descriptor * found;
1337
1338         lbs_deb_enter(LBS_DEB_SCAN);
1339
1340         lbs_scan_networks(priv, NULL, 1);
1341         if (adapter->surpriseremoved)
1342                 goto out;
1343
1344         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1345
1346         found = lbs_find_best_ssid_in_list(adapter, preferred_mode);
1347         if (found && (found->ssid_len > 0)) {
1348                 memcpy(out_ssid, &found->ssid, IW_ESSID_MAX_SIZE);
1349                 *out_ssid_len = found->ssid_len;
1350                 *out_mode = found->mode;
1351                 ret = 0;
1352         }
1353
1354 out:
1355         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1356         return ret;
1357 }
1358
1359 /**
1360  *  @brief Scan Network
1361  *
1362  *  @param dev          A pointer to net_device structure
1363  *  @param info         A pointer to iw_request_info structure
1364  *  @param vwrq         A pointer to iw_param structure
1365  *  @param extra        A pointer to extra data buf
1366  *
1367  *  @return             0 --success, otherwise fail
1368  */
1369 int lbs_set_scan(struct net_device *dev, struct iw_request_info *info,
1370                   struct iw_param *vwrq, char *extra)
1371 {
1372         lbs_private *priv = dev->priv;
1373         lbs_adapter *adapter = priv->adapter;
1374
1375         lbs_deb_enter(LBS_DEB_SCAN);
1376
1377         if (!delayed_work_pending(&priv->scan_work)) {
1378                 queue_delayed_work(priv->work_thread, &priv->scan_work,
1379                                    msecs_to_jiffies(50));
1380         }
1381
1382         if (adapter->surpriseremoved)
1383                 return -1;
1384
1385         lbs_deb_leave(LBS_DEB_SCAN);
1386         return 0;
1387 }
1388
1389
1390 /**
1391  *  @brief Send a scan command for all available channels filtered on a spec
1392  *
1393  *  Used in association code and from debugfs
1394  *
1395  *  @param priv             A pointer to lbs_private structure
1396  *  @param ssid             A pointer to the SSID to scan for
1397  *  @param ssid_len         Length of the SSID
1398  *  @param clear_ssid       Should existing scan results with this SSID
1399  *                          be cleared?
1400  *  @param prequestedssid   A pointer to AP's ssid
1401  *  @param keeppreviousscan Flag used to save/clear scan table before scan
1402  *
1403  *  @return                0-success, otherwise fail
1404  */
1405 int lbs_send_specific_ssid_scan(lbs_private *priv,
1406                         u8 *ssid, u8 ssid_len, u8 clear_ssid)
1407 {
1408         lbs_adapter *adapter = priv->adapter;
1409         struct lbs_ioctl_user_scan_cfg scancfg;
1410         int ret = 0;
1411
1412         lbs_deb_enter_args(LBS_DEB_SCAN, "SSID '%s', clear %d",
1413                 escape_essid(ssid, ssid_len), clear_ssid);
1414
1415         if (!ssid_len)
1416                 goto out;
1417
1418         memset(&scancfg, 0x00, sizeof(scancfg));
1419         memcpy(scancfg.ssid, ssid, ssid_len);
1420         scancfg.ssid_len = ssid_len;
1421         scancfg.clear_ssid = clear_ssid;
1422
1423         lbs_scan_networks(priv, &scancfg, 1);
1424         if (adapter->surpriseremoved) {
1425                 ret = -1;
1426                 goto out;
1427         }
1428         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1429
1430 out:
1431         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1432         return ret;
1433 }
1434
1435
1436
1437
1438 /*********************************************************************/
1439 /*                                                                   */
1440 /*  Support for Wireless Extensions                                  */
1441 /*                                                                   */
1442 /*********************************************************************/
1443
1444 #define MAX_CUSTOM_LEN 64
1445
1446 static inline char *lbs_translate_scan(lbs_private *priv,
1447                                         char *start, char *stop,
1448                                         struct bss_descriptor *bss)
1449 {
1450         lbs_adapter *adapter = priv->adapter;
1451         struct chan_freq_power *cfp;
1452         char *current_val;      /* For rates */
1453         struct iw_event iwe;    /* Temporary buffer */
1454         int j;
1455 #define PERFECT_RSSI ((u8)50)
1456 #define WORST_RSSI   ((u8)0)
1457 #define RSSI_DIFF    ((u8)(PERFECT_RSSI - WORST_RSSI))
1458         u8 rssi;
1459
1460         lbs_deb_enter(LBS_DEB_SCAN);
1461
1462         cfp = lbs_find_cfp_by_band_and_channel(adapter, 0, bss->channel);
1463         if (!cfp) {
1464                 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1465                 start = NULL;
1466                 goto out;
1467         }
1468
1469         /* First entry *MUST* be the AP BSSID */
1470         iwe.cmd = SIOCGIWAP;
1471         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1472         memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1473         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1474
1475         /* SSID */
1476         iwe.cmd = SIOCGIWESSID;
1477         iwe.u.data.flags = 1;
1478         iwe.u.data.length = min((u32) bss->ssid_len, (u32) IW_ESSID_MAX_SIZE);
1479         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1480
1481         /* Mode */
1482         iwe.cmd = SIOCGIWMODE;
1483         iwe.u.mode = bss->mode;
1484         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1485
1486         /* Frequency */
1487         iwe.cmd = SIOCGIWFREQ;
1488         iwe.u.freq.m = (long)cfp->freq * 100000;
1489         iwe.u.freq.e = 1;
1490         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1491
1492         /* Add quality statistics */
1493         iwe.cmd = IWEVQUAL;
1494         iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1495         iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1496
1497         rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1498         iwe.u.qual.qual =
1499             (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1500              (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1501             (RSSI_DIFF * RSSI_DIFF);
1502         if (iwe.u.qual.qual > 100)
1503                 iwe.u.qual.qual = 100;
1504
1505         if (adapter->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1506                 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1507         } else {
1508                 iwe.u.qual.noise =
1509                     CAL_NF(adapter->NF[TYPE_BEACON][TYPE_NOAVG]);
1510         }
1511
1512         /* Locally created ad-hoc BSSs won't have beacons if this is the
1513          * only station in the adhoc network; so get signal strength
1514          * from receive statistics.
1515          */
1516         if ((adapter->mode == IW_MODE_ADHOC)
1517             && adapter->adhoccreate
1518             && !lbs_ssid_cmp(adapter->curbssparams.ssid,
1519                                   adapter->curbssparams.ssid_len,
1520                                   bss->ssid, bss->ssid_len)) {
1521                 int snr, nf;
1522                 snr = adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1523                 nf = adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1524                 iwe.u.qual.level = CAL_RSSI(snr, nf);
1525         }
1526         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
1527
1528         /* Add encryption capability */
1529         iwe.cmd = SIOCGIWENCODE;
1530         if (bss->capability & WLAN_CAPABILITY_PRIVACY) {
1531                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1532         } else {
1533                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1534         }
1535         iwe.u.data.length = 0;
1536         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1537
1538         current_val = start + IW_EV_LCP_LEN;
1539
1540         iwe.cmd = SIOCGIWRATE;
1541         iwe.u.bitrate.fixed = 0;
1542         iwe.u.bitrate.disabled = 0;
1543         iwe.u.bitrate.value = 0;
1544
1545         for (j = 0; bss->rates[j] && (j < sizeof(bss->rates)); j++) {
1546                 /* Bit rate given in 500 kb/s units */
1547                 iwe.u.bitrate.value = bss->rates[j] * 500000;
1548                 current_val = iwe_stream_add_value(start, current_val,
1549                                          stop, &iwe, IW_EV_PARAM_LEN);
1550         }
1551         if ((bss->mode == IW_MODE_ADHOC)
1552             && !lbs_ssid_cmp(adapter->curbssparams.ssid,
1553                                   adapter->curbssparams.ssid_len,
1554                                   bss->ssid, bss->ssid_len)
1555             && adapter->adhoccreate) {
1556                 iwe.u.bitrate.value = 22 * 500000;
1557                 current_val = iwe_stream_add_value(start, current_val,
1558                                          stop, &iwe, IW_EV_PARAM_LEN);
1559         }
1560         /* Check if we added any event */
1561         if((current_val - start) > IW_EV_LCP_LEN)
1562                 start = current_val;
1563
1564         memset(&iwe, 0, sizeof(iwe));
1565         if (bss->wpa_ie_len) {
1566                 char buf[MAX_WPA_IE_LEN];
1567                 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1568                 iwe.cmd = IWEVGENIE;
1569                 iwe.u.data.length = bss->wpa_ie_len;
1570                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1571         }
1572
1573         memset(&iwe, 0, sizeof(iwe));
1574         if (bss->rsn_ie_len) {
1575                 char buf[MAX_WPA_IE_LEN];
1576                 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1577                 iwe.cmd = IWEVGENIE;
1578                 iwe.u.data.length = bss->rsn_ie_len;
1579                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1580         }
1581
1582         if (bss->mesh) {
1583                 char custom[MAX_CUSTOM_LEN];
1584                 char *p = custom;
1585
1586                 iwe.cmd = IWEVCUSTOM;
1587                 p += snprintf(p, MAX_CUSTOM_LEN - (p - custom),
1588                               "mesh-type: olpc");
1589                 iwe.u.data.length = p - custom;
1590                 if (iwe.u.data.length)
1591                         start = iwe_stream_add_point(start, stop, &iwe, custom);
1592         }
1593
1594 out:
1595         lbs_deb_leave_args(LBS_DEB_SCAN, "start %p", start);
1596         return start;
1597 }
1598
1599 /**
1600  *  @brief  Handle Retrieve scan table ioctl
1601  *
1602  *  @param dev          A pointer to net_device structure
1603  *  @param info         A pointer to iw_request_info structure
1604  *  @param dwrq         A pointer to iw_point structure
1605  *  @param extra        A pointer to extra data buf
1606  *
1607  *  @return             0 --success, otherwise fail
1608  */
1609 int lbs_get_scan(struct net_device *dev, struct iw_request_info *info,
1610                   struct iw_point *dwrq, char *extra)
1611 {
1612 #define SCAN_ITEM_SIZE 128
1613         lbs_private *priv = dev->priv;
1614         lbs_adapter *adapter = priv->adapter;
1615         int err = 0;
1616         char *ev = extra;
1617         char *stop = ev + dwrq->length;
1618         struct bss_descriptor * iter_bss;
1619         struct bss_descriptor * safe;
1620
1621         lbs_deb_enter(LBS_DEB_SCAN);
1622
1623         /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1624         if ((adapter->mode == IW_MODE_ADHOC) && adapter->adhoccreate) {
1625                 lbs_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
1626                                         CMD_OPTION_WAITFORRSP, 0, NULL);
1627         }
1628
1629         mutex_lock(&adapter->lock);
1630         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1631                 char * next_ev;
1632                 unsigned long stale_time;
1633
1634                 if (stop - ev < SCAN_ITEM_SIZE) {
1635                         err = -E2BIG;
1636                         break;
1637                 }
1638
1639                 /* For mesh device, list only mesh networks */
1640                 if (dev == priv->mesh_dev && !iter_bss->mesh)
1641                         continue;
1642
1643                 /* Prune old an old scan result */
1644                 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1645                 if (time_after(jiffies, stale_time)) {
1646                         list_move_tail (&iter_bss->list,
1647                                         &adapter->network_free_list);
1648                         clear_bss_descriptor(iter_bss);
1649                         continue;
1650                 }
1651
1652                 /* Translate to WE format this entry */
1653                 next_ev = lbs_translate_scan(priv, ev, stop, iter_bss);
1654                 if (next_ev == NULL)
1655                         continue;
1656                 ev = next_ev;
1657         }
1658         mutex_unlock(&adapter->lock);
1659
1660         dwrq->length = (ev - extra);
1661         dwrq->flags = 0;
1662
1663         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", err);
1664         return err;
1665 }
1666
1667
1668
1669
1670 /*********************************************************************/
1671 /*                                                                   */
1672 /*  Command execution                                                */
1673 /*                                                                   */
1674 /*********************************************************************/
1675
1676
1677 /**
1678  *  @brief Prepare a scan command to be sent to the firmware
1679  *
1680  *  Called from lbs_prepare_and_send_command() in cmd.c
1681  *
1682  *  Sends a fixed lenght data part (specifying the BSS type and BSSID filters)
1683  *  as well as a variable number/length of TLVs to the firmware.
1684  *
1685  *  @param priv       A pointer to lbs_private structure
1686  *  @param cmd        A pointer to cmd_ds_command structure to be sent to
1687  *                    firmware with the cmd_DS_801_11_SCAN structure
1688  *  @param pdata_buf  Void pointer cast of a lbs_scan_cmd_config struct used
1689  *                    to set the fields/TLVs for the command sent to firmware
1690  *
1691  *  @return           0 or -1
1692  */
1693 int lbs_cmd_80211_scan(lbs_private *priv,
1694                          struct cmd_ds_command *cmd, void *pdata_buf)
1695 {
1696         struct cmd_ds_802_11_scan *pscan = &cmd->params.scan;
1697         struct lbs_scan_cmd_config *pscancfg = pdata_buf;
1698
1699         lbs_deb_enter(LBS_DEB_SCAN);
1700
1701         /* Set fixed field variables in scan command */
1702         pscan->bsstype = pscancfg->bsstype;
1703         memcpy(pscan->bssid, pscancfg->bssid, ETH_ALEN);
1704         memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen);
1705
1706         cmd->command = cpu_to_le16(CMD_802_11_SCAN);
1707
1708         /* size is equal to the sizeof(fixed portions) + the TLV len + header */
1709         cmd->size = cpu_to_le16(sizeof(pscan->bsstype) + ETH_ALEN
1710                                 + pscancfg->tlvbufferlen + S_DS_GEN);
1711
1712         lbs_deb_scan("SCAN_CMD: command 0x%04x, size %d, seqnum %d\n",
1713                      le16_to_cpu(cmd->command), le16_to_cpu(cmd->size),
1714                      le16_to_cpu(cmd->seqnum));
1715
1716         lbs_deb_leave(LBS_DEB_SCAN);
1717         return 0;
1718 }
1719
1720 static inline int is_same_network(struct bss_descriptor *src,
1721                                   struct bss_descriptor *dst)
1722 {
1723         /* A network is only a duplicate if the channel, BSSID, and ESSID
1724          * all match.  We treat all <hidden> with the same BSSID and channel
1725          * as one network */
1726         return ((src->ssid_len == dst->ssid_len) &&
1727                 (src->channel == dst->channel) &&
1728                 !compare_ether_addr(src->bssid, dst->bssid) &&
1729                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1730 }
1731
1732 /**
1733  *  @brief This function handles the command response of scan
1734  *
1735  *  Called from handle_cmd_response() in cmdrespc.
1736  *
1737  *   The response buffer for the scan command has the following
1738  *      memory layout:
1739  *
1740  *     .-----------------------------------------------------------.
1741  *     |  header (4 * sizeof(u16)):  Standard command response hdr |
1742  *     .-----------------------------------------------------------.
1743  *     |  bufsize (u16) : sizeof the BSS Description data          |
1744  *     .-----------------------------------------------------------.
1745  *     |  NumOfSet (u8) : Number of BSS Descs returned             |
1746  *     .-----------------------------------------------------------.
1747  *     |  BSSDescription data (variable, size given in bufsize)    |
1748  *     .-----------------------------------------------------------.
1749  *     |  TLV data (variable, size calculated using header->size,  |
1750  *     |            bufsize and sizeof the fixed fields above)     |
1751  *     .-----------------------------------------------------------.
1752  *
1753  *  @param priv    A pointer to lbs_private structure
1754  *  @param resp    A pointer to cmd_ds_command
1755  *
1756  *  @return        0 or -1
1757  */
1758 int lbs_ret_80211_scan(lbs_private *priv, struct cmd_ds_command *resp)
1759 {
1760         lbs_adapter *adapter = priv->adapter;
1761         struct cmd_ds_802_11_scan_rsp *pscan;
1762         struct bss_descriptor * iter_bss;
1763         struct bss_descriptor * safe;
1764         u8 *pbssinfo;
1765         u16 scanrespsize;
1766         int bytesleft;
1767         int idx;
1768         int tlvbufsize;
1769         int ret;
1770
1771         lbs_deb_enter(LBS_DEB_SCAN);
1772
1773         /* Prune old entries from scan table */
1774         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1775                 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1776                 if (time_before(jiffies, stale_time))
1777                         continue;
1778                 list_move_tail (&iter_bss->list, &adapter->network_free_list);
1779                 clear_bss_descriptor(iter_bss);
1780         }
1781
1782         pscan = &resp->params.scanresp;
1783
1784         if (pscan->nr_sets > MAX_NETWORK_COUNT) {
1785                 lbs_deb_scan(
1786                        "SCAN_RESP: too many scan results (%d, max %d)!!\n",
1787                        pscan->nr_sets, MAX_NETWORK_COUNT);
1788                 ret = -1;
1789                 goto done;
1790         }
1791
1792         bytesleft = le16_to_cpu(get_unaligned((u16*)&pscan->bssdescriptsize));
1793         lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1794
1795         scanrespsize = le16_to_cpu(get_unaligned((u16*)&resp->size));
1796         lbs_deb_scan("SCAN_RESP: returned %d AP before parsing\n",
1797                pscan->nr_sets);
1798
1799         pbssinfo = pscan->bssdesc_and_tlvbuffer;
1800
1801         /* The size of the TLV buffer is equal to the entire command response
1802          *   size (scanrespsize) minus the fixed fields (sizeof()'s), the
1803          *   BSS Descriptions (bssdescriptsize as bytesLef) and the command
1804          *   response header (S_DS_GEN)
1805          */
1806         tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize)
1807                                      + sizeof(pscan->nr_sets)
1808                                      + S_DS_GEN);
1809
1810         /*
1811          *  Process each scan response returned (pscan->nr_sets).  Save
1812          *    the information in the newbssentry and then insert into the
1813          *    driver scan table either as an update to an existing entry
1814          *    or as an addition at the end of the table
1815          */
1816         for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) {
1817                 struct bss_descriptor new;
1818                 struct bss_descriptor * found = NULL;
1819                 struct bss_descriptor * oldest = NULL;
1820                 DECLARE_MAC_BUF(mac);
1821
1822                 /* Process the data fields and IEs returned for this BSS */
1823                 memset(&new, 0, sizeof (struct bss_descriptor));
1824                 if (lbs_process_bss(&new, &pbssinfo, &bytesleft) != 0) {
1825                         /* error parsing the scan response, skipped */
1826                         lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1827                         continue;
1828                 }
1829
1830                 /* Try to find this bss in the scan table */
1831                 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1832                         if (is_same_network(iter_bss, &new)) {
1833                                 found = iter_bss;
1834                                 break;
1835                         }
1836
1837                         if ((oldest == NULL) ||
1838                             (iter_bss->last_scanned < oldest->last_scanned))
1839                                 oldest = iter_bss;
1840                 }
1841
1842                 if (found) {
1843                         /* found, clear it */
1844                         clear_bss_descriptor(found);
1845                 } else if (!list_empty(&adapter->network_free_list)) {
1846                         /* Pull one from the free list */
1847                         found = list_entry(adapter->network_free_list.next,
1848                                            struct bss_descriptor, list);
1849                         list_move_tail(&found->list, &adapter->network_list);
1850                 } else if (oldest) {
1851                         /* If there are no more slots, expire the oldest */
1852                         found = oldest;
1853                         clear_bss_descriptor(found);
1854                         list_move_tail(&found->list, &adapter->network_list);
1855                 } else {
1856                         continue;
1857                 }
1858
1859                 lbs_deb_scan("SCAN_RESP: BSSID = %s\n",
1860                              print_mac(mac, new.bssid));
1861
1862                 /* Copy the locally created newbssentry to the scan table */
1863                 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1864         }
1865
1866         ret = 0;
1867
1868 done:
1869         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1870         return ret;
1871 }