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                     (adapter->mesh_connect_status != LBS_CONNECTED)) {
 302                         /* Scan all the supported chan for the first scan */
 303                         if (!adapter->universal_channel[rgnidx].valid)
 304                                 continue;
 305                         scanregion = &adapter->universal_channel[rgnidx];
 306
 307                         /* clear the parsed_region_chan for the first scan */
 308                         memset(&adapter->parsed_region_chan, 0x00,
 309                                sizeof(adapter->parsed_region_chan));
 310                 } else {
 311                         if (!adapter->region_channel[rgnidx].valid)
 312                                 continue;
 313                         scanregion = &adapter->region_channel[rgnidx];
 314                 }
 315
 316                 for (nextchan = 0;
 317                      nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
 318
 319                         cfp = scanregion->CFP + nextchan;
 320
 321                         if (priv->adapter->enable11d) {
 322                                 scantype =
 323                                     lbs_get_scan_type_11d(cfp->channel,
 324                                                            &adapter->
 325                                                            parsed_region_chan);
 326                         }
 327
 328                         switch (scanregion->band) {
 329                         case BAND_B:
 330                         case BAND_G:
 331                         default:
 332                                 scanchanlist[chanidx].radiotype =
 333                                     CMD_SCAN_RADIO_TYPE_BG;
 334                                 break;
 335                         }
 336
 337                         if (scantype == CMD_SCAN_TYPE_PASSIVE) {
 338                                 scanchanlist[chanidx].maxscantime =
 339                                     cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
 340                                 scanchanlist[chanidx].chanscanmode.passivescan =
 341                                     1;
 342                         } else {
 343                                 scanchanlist[chanidx].maxscantime =
 344                                     cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
 345                                 scanchanlist[chanidx].chanscanmode.passivescan =
 346                                     0;
 347                         }
 348
 349                         scanchanlist[chanidx].channumber = cfp->channel;
 350
 351                         if (filteredscan) {
 352                                 scanchanlist[chanidx].chanscanmode.
 353                                     disablechanfilt = 1;
 354                         }
 355                 }
 356         }
 357 }
 358
 359
 360 /* Delayed partial scan worker */
 361 void lbs_scan_worker(struct work_struct *work)
 362 {
 363         lbs_private *priv = container_of(work, lbs_private, scan_work.work);
 364
 365         lbs_scan_networks(priv, NULL, 0);
 366 }
 367
 368
 369 /**
 370  *  @brief Construct a lbs_scan_cmd_config structure to use in issue scan cmds
 371  *
 372  *  Application layer or other functions can invoke lbs_scan_networks
 373  *    with a scan configuration supplied in a lbs_ioctl_user_scan_cfg struct.
 374  *    This structure is used as the basis of one or many lbs_scan_cmd_config
 375  *    commands that are sent to the command processing module and sent to
 376  *    firmware.
 377  *
 378  *  Create a lbs_scan_cmd_config based on the following user supplied
 379  *    parameters (if present):
 380  *             - SSID filter
 381  *             - BSSID filter
 382  *             - Number of Probes to be sent
 383  *             - channel list
 384  *
 385  *  If the SSID or BSSID filter is not present, disable/clear the filter.
 386  *  If the number of probes is not set, use the adapter default setting
 387  *  Qualify the channel
 388  *
 389  *  @param priv             A pointer to lbs_private structure
 390  *  @param puserscanin      NULL or pointer to scan configuration parameters
 391  *  @param ppchantlvout     Output parameter: Pointer to the start of the
 392  *                          channel TLV portion of the output scan config
 393  *  @param pscanchanlist    Output parameter: Pointer to the resulting channel
 394  *                          list to scan
 395  *  @param pmaxchanperscan  Output parameter: Number of channels to scan for
 396  *                          each issuance of the firmware scan command
 397  *  @param pfilteredscan    Output parameter: Flag indicating whether or not
 398  *                          a BSSID or SSID filter is being sent in the
 399  *                          command to firmware.  Used to increase the number
 400  *                          of channels sent in a scan command and to
 401  *                          disable the firmware channel scan filter.
 402  *  @param pscancurrentonly Output parameter: Flag indicating whether or not
 403  *                          we are only scanning our current active channel
 404  *
 405  *  @return                 resulting scan configuration
 406  */
 407 static struct lbs_scan_cmd_config *
 408 lbs_scan_setup_scan_config(lbs_private *priv,
 409                             const struct lbs_ioctl_user_scan_cfg *puserscanin,
 410                             struct mrvlietypes_chanlistparamset ** ppchantlvout,
 411                             struct chanscanparamset * pscanchanlist,
 412                             int *pmaxchanperscan,
 413                             u8 * pfilteredscan,
 414                             u8 * pscancurrentonly)
 415 {
 416         struct mrvlietypes_numprobes *pnumprobestlv;
 417         struct mrvlietypes_ssidparamset *pssidtlv;
 418         struct lbs_scan_cmd_config *pscancfgout = NULL;
 419         u8 *ptlvpos;
 420         u16 numprobes;
 421         int chanidx;
 422         int scantype;
 423         int scandur;
 424         int channel;
 425         int radiotype;
 426
 427         lbs_deb_enter(LBS_DEB_SCAN);
 428
 429         pscancfgout = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
 430         if (pscancfgout == NULL)
 431                 goto out;
 432
 433         /* The tlvbufferlen is calculated for each scan command.  The TLVs added
 434          *   in this routine will be preserved since the routine that sends
 435          *   the command will append channelTLVs at *ppchantlvout.  The difference
 436          *   between the *ppchantlvout and the tlvbuffer start will be used
 437          *   to calculate the size of anything we add in this routine.
 438          */
 439         pscancfgout->tlvbufferlen = 0;
 440
 441         /* Running tlv pointer.  Assigned to ppchantlvout at end of function
 442          *  so later routines know where channels can be added to the command buf
 443          */
 444         ptlvpos = pscancfgout->tlvbuffer;
 445
 446         /*
 447          * Set the initial scan paramters for progressive scanning.  If a specific
 448          *   BSSID or SSID is used, the number of channels in the scan command
 449          *   will be increased to the absolute maximum
 450          */
 451         *pmaxchanperscan = MRVDRV_CHANNELS_PER_SCAN_CMD;
 452
 453         /* Initialize the scan as un-filtered by firmware, set to TRUE below if
 454          *   a SSID or BSSID filter is sent in the command
 455          */
 456         *pfilteredscan = 0;
 457
 458         /* Initialize the scan as not being only on the current channel.  If
 459          *   the channel list is customized, only contains one channel, and
 460          *   is the active channel, this is set true and data flow is not halted.
 461          */
 462         *pscancurrentonly = 0;
 463
 464         if (puserscanin) {
 465                 /* Set the bss type scan filter, use adapter setting if unset */
 466                 pscancfgout->bsstype =
 467                     puserscanin->bsstype ? puserscanin->bsstype : CMD_BSS_TYPE_ANY;
 468
 469                 /* Set the number of probes to send, use adapter setting if unset */
 470                 numprobes = puserscanin->numprobes ? puserscanin->numprobes : 0;
 471
 472                 /*
 473                  * Set the BSSID filter to the incoming configuration,
 474                  *   if non-zero.  If not set, it will remain disabled (all zeros).
 475                  */
 476                 memcpy(pscancfgout->bssid, puserscanin->bssid,
 477                        sizeof(pscancfgout->bssid));
 478
 479                 if (puserscanin->ssid_len) {
 480                         pssidtlv =
 481                             (struct mrvlietypes_ssidparamset *) pscancfgout->
 482                             tlvbuffer;
 483                         pssidtlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
 484                         pssidtlv->header.len = cpu_to_le16(puserscanin->ssid_len);
 485                         memcpy(pssidtlv->ssid, puserscanin->ssid,
 486                                puserscanin->ssid_len);
 487                         ptlvpos += sizeof(pssidtlv->header) + puserscanin->ssid_len;
 488                 }
 489
 490                 /*
 491                  *  The default number of channels sent in the command is low to
 492                  *    ensure the response buffer from the firmware does not truncate
 493                  *    scan results.  That is not an issue with an SSID or BSSID
 494                  *    filter applied to the scan results in the firmware.
 495                  */
 496                 if (   puserscanin->ssid_len
 497                     || (compare_ether_addr(pscancfgout->bssid, &zeromac[0]) != 0)) {
 498                         *pmaxchanperscan = MRVDRV_MAX_CHANNELS_PER_SCAN;
 499                         *pfilteredscan = 1;
 500                 }
 501         } else {
 502                 pscancfgout->bsstype = CMD_BSS_TYPE_ANY;
 503                 numprobes = 0;
 504         }
 505
 506         /* If the input config or adapter has the number of Probes set, add tlv */
 507         if (numprobes) {
 508                 pnumprobestlv = (struct mrvlietypes_numprobes *) ptlvpos;
 509                 pnumprobestlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 510                 pnumprobestlv->header.len = cpu_to_le16(2);
 511                 pnumprobestlv->numprobes = cpu_to_le16(numprobes);
 512
 513                 ptlvpos += sizeof(*pnumprobestlv);
 514         }
 515
 516         /*
 517          * Set the output for the channel TLV to the address in the tlv buffer
 518          *   past any TLVs that were added in this fuction (SSID, numprobes).
 519          *   channel TLVs will be added past this for each scan command, preserving
 520          *   the TLVs that were previously added.
 521          */
 522         *ppchantlvout = (struct mrvlietypes_chanlistparamset *) ptlvpos;
 523
 524         if (!puserscanin || !puserscanin->chanlist[0].channumber) {
 525                 /* Create a default channel scan list */
 526                 lbs_deb_scan("creating full region channel list\n");
 527                 lbs_scan_create_channel_list(priv, pscanchanlist,
 528                                               *pfilteredscan);
 529                 goto out;
 530         }
 531
 532         for (chanidx = 0;
 533              chanidx < LBS_IOCTL_USER_SCAN_CHAN_MAX
 534              && puserscanin->chanlist[chanidx].channumber; chanidx++) {
 535
 536                 channel = puserscanin->chanlist[chanidx].channumber;
 537                 (pscanchanlist + chanidx)->channumber = channel;
 538
 539                 radiotype = puserscanin->chanlist[chanidx].radiotype;
 540                 (pscanchanlist + chanidx)->radiotype = radiotype;
 541
 542                 scantype = puserscanin->chanlist[chanidx].scantype;
 543
 544                 if (scantype == CMD_SCAN_TYPE_PASSIVE) {
 545                         (pscanchanlist +
 546                          chanidx)->chanscanmode.passivescan = 1;
 547                 } else {
 548                         (pscanchanlist +
 549                          chanidx)->chanscanmode.passivescan = 0;
 550                 }
 551
 552                 if (puserscanin->chanlist[chanidx].scantime) {
 553                         scandur = puserscanin->chanlist[chanidx].scantime;
 554                 } else {
 555                         if (scantype == CMD_SCAN_TYPE_PASSIVE) {
 556                                 scandur = MRVDRV_PASSIVE_SCAN_CHAN_TIME;
 557                         } else {
 558                                 scandur = MRVDRV_ACTIVE_SCAN_CHAN_TIME;
 559                         }
 560                 }
 561
 562                 (pscanchanlist + chanidx)->minscantime =
 563                     cpu_to_le16(scandur);
 564                 (pscanchanlist + chanidx)->maxscantime =
 565                     cpu_to_le16(scandur);
 566         }
 567
 568         /* Check if we are only scanning the current channel */
 569         if ((chanidx == 1) &&
 570             (puserscanin->chanlist[0].channumber ==
 571                                priv->adapter->curbssparams.channel)) {
 572                 *pscancurrentonly = 1;
 573                 lbs_deb_scan("scanning current channel only");
 574         }
 575
 576 out:
 577         return pscancfgout;
 578 }
 579
 580 /**
 581  *  @brief Construct and send multiple scan config commands to the firmware
 582  *
 583  *  Only used from lbs_scan_networks()
 584  *
 585  *  Previous routines have created a lbs_scan_cmd_config with any requested
 586  *   TLVs.  This function splits the channel TLV into maxchanperscan lists
 587  *   and sends the portion of the channel TLV along with the other TLVs
 588  *   to the lbs_cmd routines for execution in the firmware.
 589  *
 590  *  @param priv            A pointer to lbs_private structure
 591  *  @param maxchanperscan  Maximum number channels to be included in each
 592  *                         scan command sent to firmware
 593  *  @param filteredscan    Flag indicating whether or not a BSSID or SSID
 594  *                         filter is being used for the firmware command
 595  *                         scan command sent to firmware
 596  *  @param pscancfgout     Scan configuration used for this scan.
 597  *  @param pchantlvout     Pointer in the pscancfgout where the channel TLV
 598  *                         should start.  This is past any other TLVs that
 599  *                         must be sent down in each firmware command.
 600  *  @param pscanchanlist   List of channels to scan in maxchanperscan segments
 601  *
 602  *  @return                0 or error return otherwise
 603  */
 604 static int lbs_scan_channel_list(lbs_private *priv,
 605                                   int maxchanperscan,
 606                                   u8 filteredscan,
 607                                   struct lbs_scan_cmd_config *pscancfgout,
 608                                   struct mrvlietypes_chanlistparamset * pchantlvout,
 609                                   struct chanscanparamset * pscanchanlist,
 610                                   const struct lbs_ioctl_user_scan_cfg *puserscanin,
 611                                   int full_scan)
 612 {
 613         struct chanscanparamset *ptmpchan;
 614         struct chanscanparamset *pstartchan;
 615         u8 scanband;
 616         int doneearly;
 617         int tlvidx;
 618         int ret = 0;
 619         int scanned = 0;
 620         union iwreq_data wrqu;
 621
 622         lbs_deb_enter_args(LBS_DEB_SCAN, "maxchanperscan %d, filteredscan %d, "
 623                 "full_scan %d", maxchanperscan, filteredscan, full_scan);
 624
 625         if (!pscancfgout || !pchantlvout || !pscanchanlist) {
 626                 lbs_deb_scan("pscancfgout, pchantlvout or "
 627                         "pscanchanlist is NULL\n");
 628                 ret = -1;
 629                 goto out;
 630         }
 631
 632         pchantlvout->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 633
 634         /* Set the temp channel struct pointer to the start of the desired list */
 635         ptmpchan = pscanchanlist;
 636
 637         if (priv->adapter->last_scanned_channel && !puserscanin)
 638                 ptmpchan += priv->adapter->last_scanned_channel;
 639
 640         /* Loop through the desired channel list, sending a new firmware scan
 641          *   commands for each maxchanperscan channels (or for 1,6,11 individually
 642          *   if configured accordingly)
 643          */
 644         while (ptmpchan->channumber) {
 645
 646                 tlvidx = 0;
 647                 pchantlvout->header.len = 0;
 648                 scanband = ptmpchan->radiotype;
 649                 pstartchan = ptmpchan;
 650                 doneearly = 0;
 651
 652                 /* Construct the channel TLV for the scan command.  Continue to
 653                  *  insert channel TLVs until:
 654                  *    - the tlvidx hits the maximum configured per scan command
 655                  *    - the next channel to insert is 0 (end of desired channel list)
 656                  *    - doneearly is set (controlling individual scanning of 1,6,11)
 657                  */
 658                 while (tlvidx < maxchanperscan && ptmpchan->channumber
 659                        && !doneearly && scanned < 2) {
 660
 661                         lbs_deb_scan("channel %d, radio %d, passive %d, "
 662                                 "dischanflt %d, maxscantime %d\n",
 663                                 ptmpchan->channumber,
 664                                 ptmpchan->radiotype,
 665                                      ptmpchan->chanscanmode.passivescan,
 666                                      ptmpchan->chanscanmode.disablechanfilt,
 667                                      ptmpchan->maxscantime);
 668
 669                         /* Copy the current channel TLV to the command being prepared */
 670                         memcpy(pchantlvout->chanscanparam + tlvidx,
 671                                ptmpchan, sizeof(pchantlvout->chanscanparam));
 672
 673                         /* Increment the TLV header length by the size appended */
 674                         /* Ew, it would be _so_ nice if we could just declare the
 675                            variable little-endian and let GCC handle it for us */
 676                         pchantlvout->header.len =
 677                                 cpu_to_le16(le16_to_cpu(pchantlvout->header.len) +
 678                                             sizeof(pchantlvout->chanscanparam));
 679
 680                         /*
 681                          *  The tlv buffer length is set to the number of bytes of the
 682                          *    between the channel tlv pointer and the start of the
 683                          *    tlv buffer.  This compensates for any TLVs that were appended
 684                          *    before the channel list.
 685                          */
 686                         pscancfgout->tlvbufferlen = ((u8 *) pchantlvout
 687                                                      - pscancfgout->tlvbuffer);
 688
 689                         /*  Add the size of the channel tlv header and the data length */
 690                         pscancfgout->tlvbufferlen +=
 691                             (sizeof(pchantlvout->header)
 692                              + le16_to_cpu(pchantlvout->header.len));
 693
 694                         /* Increment the index to the channel tlv we are constructing */
 695                         tlvidx++;
 696
 697                         doneearly = 0;
 698
 699                         /* Stop the loop if the *current* channel is in the 1,6,11 set
 700                          *   and we are not filtering on a BSSID or SSID.
 701                          */
 702                         if (!filteredscan && (ptmpchan->channumber == 1
 703                                               || ptmpchan->channumber == 6
 704                                               || ptmpchan->channumber == 11)) {
 705                                 doneearly = 1;
 706                         }
 707
 708                         /* Increment the tmp pointer to the next channel to be scanned */
 709                         ptmpchan++;
 710                         scanned++;
 711
 712                         /* Stop the loop if the *next* channel is in the 1,6,11 set.
 713                          *  This will cause it to be the only channel scanned on the next
 714                          *  interation
 715                          */
 716                         if (!filteredscan && (ptmpchan->channumber == 1
 717                                               || ptmpchan->channumber == 6
 718                                               || ptmpchan->channumber == 11)) {
 719                                 doneearly = 1;
 720                         }
 721                 }
 722
 723                 /* Send the scan command to the firmware with the specified cfg */
 724                 ret = lbs_prepare_and_send_command(priv, CMD_802_11_SCAN, 0,
 725                                             0, 0, pscancfgout);
 726                 if (scanned >= 2 && !full_scan) {
 727                         ret = 0;
 728                         goto done;
 729                 }
 730                 scanned = 0;
 731         }
 732
 733 done:
 734         priv->adapter->last_scanned_channel = ptmpchan->channumber;
 735
 736         if (priv->adapter->last_scanned_channel) {
 737                 /* Schedule the next part of the partial scan */
 738                 if (!full_scan && !priv->adapter->surpriseremoved) {
 739                         cancel_delayed_work(&priv->scan_work);
 740                         queue_delayed_work(priv->work_thread, &priv->scan_work,
 741                                            msecs_to_jiffies(300));
 742                 }
 743         } else {
 744                 /* All done, tell userspace the scan table has been updated */
 745                 memset(&wrqu, 0, sizeof(union iwreq_data));
 746                 wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
 747         }
 748
 749 out:
 750         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 751         return ret;
 752 }
 753
 754 /*
 755  * Only used from lbs_scan_networks()
 756 */
 757 static void clear_selected_scan_list_entries(lbs_adapter *adapter,
 758         const struct lbs_ioctl_user_scan_cfg *scan_cfg)
 759 {
 760         struct bss_descriptor *bss;
 761         struct bss_descriptor *safe;
 762         u32 clear_ssid_flag = 0, clear_bssid_flag = 0;
 763
 764         lbs_deb_enter(LBS_DEB_SCAN);
 765
 766         if (!scan_cfg)
 767                 goto out;
 768
 769         if (scan_cfg->clear_ssid && scan_cfg->ssid_len)
 770                 clear_ssid_flag = 1;
 771
 772         if (scan_cfg->clear_bssid
 773             && (compare_ether_addr(scan_cfg->bssid, &zeromac[0]) != 0)
 774             && (compare_ether_addr(scan_cfg->bssid, &bcastmac[0]) != 0)) {
 775                 clear_bssid_flag = 1;
 776         }
 777
 778         if (!clear_ssid_flag && !clear_bssid_flag)
 779                 goto out;
 780
 781         mutex_lock(&adapter->lock);
 782         list_for_each_entry_safe (bss, safe, &adapter->network_list, list) {
 783                 u32 clear = 0;
 784
 785                 /* Check for an SSID match */
 786                 if (   clear_ssid_flag
 787                     && (bss->ssid_len == scan_cfg->ssid_len)
 788                     && !memcmp(bss->ssid, scan_cfg->ssid, bss->ssid_len))
 789                         clear = 1;
 790
 791                 /* Check for a BSSID match */
 792                 if (   clear_bssid_flag
 793                     && !compare_ether_addr(bss->bssid, scan_cfg->bssid))
 794                         clear = 1;
 795
 796                 if (clear) {
 797                         list_move_tail (&bss->list, &adapter->network_free_list);
 798                         clear_bss_descriptor(bss);
 799                 }
 800         }
 801         mutex_unlock(&adapter->lock);
 802 out:
 803         lbs_deb_leave(LBS_DEB_SCAN);
 804 }
 805
 806
 807 /**
 808  *  @brief Internal function used to start a scan based on an input config
 809  *
 810  *  Also used from debugfs
 811  *
 812  *  Use the input user scan configuration information when provided in
 813  *    order to send the appropriate scan commands to firmware to populate or
 814  *    update the internal driver scan table
 815  *
 816  *  @param priv          A pointer to lbs_private structure
 817  *  @param puserscanin   Pointer to the input configuration for the requested
 818  *                       scan.
 819  *  @param full_scan     ???
 820  *
 821  *  @return              0 or < 0 if error
 822  */
 823 int lbs_scan_networks(lbs_private *priv,
 824         const struct lbs_ioctl_user_scan_cfg *puserscanin,
 825                        int full_scan)
 826 {
 827         lbs_adapter *adapter = priv->adapter;
 828         struct mrvlietypes_chanlistparamset *pchantlvout;
 829         struct chanscanparamset * scan_chan_list = NULL;
 830         struct lbs_scan_cmd_config *scan_cfg = NULL;
 831         u8 filteredscan;
 832         u8 scancurrentchanonly;
 833         int maxchanperscan;
 834         int ret;
 835 #ifdef CONFIG_LIBERTAS_DEBUG
 836         struct bss_descriptor * iter_bss;
 837         int i = 0;
 838         DECLARE_MAC_BUF(mac);
 839 #endif
 840
 841         lbs_deb_enter_args(LBS_DEB_SCAN, "full_scan %d", full_scan);
 842
 843         /* Cancel any partial outstanding partial scans if this scan
 844          * is a full scan.
 845          */
 846         if (full_scan && delayed_work_pending(&priv->scan_work))
 847                 cancel_delayed_work(&priv->scan_work);
 848
 849         scan_chan_list = kzalloc(sizeof(struct chanscanparamset) *
 850                                 LBS_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
 851         if (scan_chan_list == NULL) {
 852                 ret = -ENOMEM;
 853                 goto out;
 854         }
 855
 856         scan_cfg = lbs_scan_setup_scan_config(priv,
 857                                                puserscanin,
 858                                                &pchantlvout,
 859                                                scan_chan_list,
 860                                                &maxchanperscan,
 861                                                &filteredscan,
 862                                                &scancurrentchanonly);
 863         if (scan_cfg == NULL) {
 864                 ret = -ENOMEM;
 865                 goto out;
 866         }
 867
 868         clear_selected_scan_list_entries(adapter, puserscanin);
 869
 870         /* Keep the data path active if we are only scanning our current channel */
 871         if (!scancurrentchanonly) {
 872                 netif_stop_queue(priv->dev);
 873                 netif_carrier_off(priv->dev);
 874                 if (priv->mesh_dev) {
 875                         netif_stop_queue(priv->mesh_dev);
 876                         netif_carrier_off(priv->mesh_dev);
 877                 }
 878         }
 879
 880         ret = lbs_scan_channel_list(priv,
 881                                      maxchanperscan,
 882                                      filteredscan,
 883                                      scan_cfg,
 884                                      pchantlvout,
 885                                      scan_chan_list,
 886                                      puserscanin,
 887                                      full_scan);
 888
 889 #ifdef CONFIG_LIBERTAS_DEBUG
 890         /* Dump the scan table */
 891         mutex_lock(&adapter->lock);
 892         lbs_deb_scan("The scan table contains:\n");
 893         list_for_each_entry (iter_bss, &adapter->network_list, list) {
 894                 lbs_deb_scan("scan %02d, %s, RSSI, %d, SSID '%s'\n",
 895                        i++, print_mac(mac, iter_bss->bssid), (s32) iter_bss->rssi,
 896                        escape_essid(iter_bss->ssid, iter_bss->ssid_len));
 897         }
 898         mutex_unlock(&adapter->lock);
 899 #endif
 900
 901         if (adapter->connect_status == LBS_CONNECTED) {
 902                 netif_carrier_on(priv->dev);
 903                 netif_wake_queue(priv->dev);
 904         }
 905
 906         if (priv->mesh_dev && (adapter->mesh_connect_status == LBS_CONNECTED)) {
 907                 netif_carrier_on(priv->mesh_dev);
 908                 netif_wake_queue(priv->mesh_dev);
 909         }
 910
 911 out:
 912         if (scan_cfg)
 913                 kfree(scan_cfg);
 914
 915         if (scan_chan_list)
 916                 kfree(scan_chan_list);
 917
 918         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 919         return ret;
 920 }
 921
 922 /**
 923  *  @brief Interpret a BSS scan response returned from the firmware
 924  *
 925  *  Parse the various fixed fields and IEs passed back for a a BSS probe
 926  *   response or beacon from the scan command.  Record information as needed
 927  *   in the scan table struct bss_descriptor for that entry.
 928  *
 929  *  @param bss  Output parameter: Pointer to the BSS Entry
 930  *
 931  *  @return             0 or -1
 932  */
 933 static int lbs_process_bss(struct bss_descriptor *bss,
 934                                 u8 ** pbeaconinfo, int *bytesleft)
 935 {
 936         struct ieeetypes_fhparamset *pFH;
 937         struct ieeetypes_dsparamset *pDS;
 938         struct ieeetypes_cfparamset *pCF;
 939         struct ieeetypes_ibssparamset *pibss;
 940         DECLARE_MAC_BUF(mac);
 941         struct ieeetypes_countryinfoset *pcountryinfo;
 942         u8 *pos, *end, *p;
 943         u8 n_ex_rates = 0, got_basic_rates = 0, n_basic_rates = 0;
 944         u16 beaconsize = 0;
 945         int ret;
 946
 947         lbs_deb_enter(LBS_DEB_SCAN);
 948
 949         if (*bytesleft >= sizeof(beaconsize)) {
 950                 /* Extract & convert beacon size from the command buffer */
 951                 beaconsize = le16_to_cpu(get_unaligned((u16 *)*pbeaconinfo));
 952                 *bytesleft -= sizeof(beaconsize);
 953                 *pbeaconinfo += sizeof(beaconsize);
 954         }
 955
 956         if (beaconsize == 0 || beaconsize > *bytesleft) {
 957                 *pbeaconinfo += *bytesleft;
 958                 *bytesleft = 0;
 959                 ret = -1;
 960                 goto done;
 961         }
 962
 963         /* Initialize the current working beacon pointer for this BSS iteration */
 964         pos = *pbeaconinfo;
 965         end = pos + beaconsize;
 966
 967         /* Advance the return beacon pointer past the current beacon */
 968         *pbeaconinfo += beaconsize;
 969         *bytesleft -= beaconsize;
 970
 971         memcpy(bss->bssid, pos, ETH_ALEN);
 972         lbs_deb_scan("process_bss: AP BSSID %s\n", print_mac(mac, bss->bssid));
 973         pos += ETH_ALEN;
 974
 975         if ((end - pos) < 12) {
 976                 lbs_deb_scan("process_bss: Not enough bytes left\n");
 977                 ret = -1;
 978                 goto done;
 979         }
 980
 981         /*
 982          * next 4 fields are RSSI, time stamp, beacon interval,
 983          *   and capability information
 984          */
 985
 986         /* RSSI is 1 byte long */
 987         bss->rssi = *pos;
 988         lbs_deb_scan("process_bss: RSSI=%02X\n", *pos);
 989         pos++;
 990
 991         /* time stamp is 8 bytes long */
 992         pos += 8;
 993
 994         /* beacon interval is 2 bytes long */
 995         bss->beaconperiod = le16_to_cpup((void *) pos);
 996         pos += 2;
 997
 998         /* capability information is 2 bytes long */
 999         bss->capability = le16_to_cpup((void *) pos);
1000         lbs_deb_scan("process_bss: capabilities = 0x%4X\n", bss->capability);
1001         pos += 2;
1002
1003         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
1004                 lbs_deb_scan("process_bss: AP WEP enabled\n");
1005         if (bss->capability & WLAN_CAPABILITY_IBSS)
1006                 bss->mode = IW_MODE_ADHOC;
1007         else
1008                 bss->mode = IW_MODE_INFRA;
1009
1010         /* rest of the current buffer are IE's */
1011         lbs_deb_scan("process_bss: IE length for this AP = %zd\n", end - pos);
1012         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: IE info", pos, end - pos);
1013
1014         /* process variable IE */
1015         while (pos <= end - 2) {
1016                 struct ieee80211_info_element * elem =
1017                         (struct ieee80211_info_element *) pos;
1018
1019                 if (pos + elem->len > end) {
1020                         lbs_deb_scan("process_bss: error in processing IE, "
1021                                "bytes left < IE length\n");
1022                         break;
1023                 }
1024
1025                 switch (elem->id) {
1026                 case MFIE_TYPE_SSID:
1027                         bss->ssid_len = elem->len;
1028                         memcpy(bss->ssid, elem->data, elem->len);
1029                         lbs_deb_scan("ssid '%s', ssid length %u\n",
1030                                      escape_essid(bss->ssid, bss->ssid_len),
1031                                      bss->ssid_len);
1032                         break;
1033
1034                 case MFIE_TYPE_RATES:
1035                         n_basic_rates = min_t(u8, MAX_RATES, elem->len);
1036                         memcpy(bss->rates, elem->data, n_basic_rates);
1037                         got_basic_rates = 1;
1038                         break;
1039
1040                 case MFIE_TYPE_FH_SET:
1041                         pFH = (struct ieeetypes_fhparamset *) pos;
1042                         memmove(&bss->phyparamset.fhparamset, pFH,
1043                                 sizeof(struct ieeetypes_fhparamset));
1044 #if 0 /* I think we can store these LE */
1045                         bss->phyparamset.fhparamset.dwelltime
1046                             = le16_to_cpu(bss->phyparamset.fhparamset.dwelltime);
1047 #endif
1048                         break;
1049
1050                 case MFIE_TYPE_DS_SET:
1051                         pDS = (struct ieeetypes_dsparamset *) pos;
1052                         bss->channel = pDS->currentchan;
1053                         memcpy(&bss->phyparamset.dsparamset, pDS,
1054                                sizeof(struct ieeetypes_dsparamset));
1055                         break;
1056
1057                 case MFIE_TYPE_CF_SET:
1058                         pCF = (struct ieeetypes_cfparamset *) pos;
1059                         memcpy(&bss->ssparamset.cfparamset, pCF,
1060                                sizeof(struct ieeetypes_cfparamset));
1061                         break;
1062
1063                 case MFIE_TYPE_IBSS_SET:
1064                         pibss = (struct ieeetypes_ibssparamset *) pos;
1065                         bss->atimwindow = le32_to_cpu(pibss->atimwindow);
1066                         memmove(&bss->ssparamset.ibssparamset, pibss,
1067                                 sizeof(struct ieeetypes_ibssparamset));
1068 #if 0
1069                         bss->ssparamset.ibssparamset.atimwindow
1070                             = le16_to_cpu(bss->ssparamset.ibssparamset.atimwindow);
1071 #endif
1072                         break;
1073
1074                 case MFIE_TYPE_COUNTRY:
1075                         pcountryinfo = (struct ieeetypes_countryinfoset *) pos;
1076                         if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
1077                             || pcountryinfo->len > 254) {
1078                                 lbs_deb_scan("process_bss: 11D- Err "
1079                                        "CountryInfo len =%d min=%zd max=254\n",
1080                                        pcountryinfo->len,
1081                                        sizeof(pcountryinfo->countrycode));
1082                                 ret = -1;
1083                                 goto done;
1084                         }
1085
1086                         memcpy(&bss->countryinfo,
1087                                pcountryinfo, pcountryinfo->len + 2);
1088                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: 11d countryinfo",
1089                                 (u8 *) pcountryinfo,
1090                                 (u32) (pcountryinfo->len + 2));
1091                         break;
1092
1093                 case MFIE_TYPE_RATES_EX:
1094                         /* only process extended supported rate if data rate is
1095                          * already found. Data rate IE should come before
1096                          * extended supported rate IE
1097                          */
1098                         if (!got_basic_rates)
1099                                 break;
1100
1101                         n_ex_rates = elem->len;
1102                         if (n_basic_rates + n_ex_rates > MAX_RATES)
1103                                 n_ex_rates = MAX_RATES - n_basic_rates;
1104
1105                         p = bss->rates + n_basic_rates;
1106                         memcpy(p, elem->data, n_ex_rates);
1107                         break;
1108
1109                 case MFIE_TYPE_GENERIC:
1110                         if (elem->len >= 4 &&
1111                             elem->data[0] == 0x00 &&
1112                             elem->data[1] == 0x50 &&
1113                             elem->data[2] == 0xf2 &&
1114                             elem->data[3] == 0x01) {
1115                                 bss->wpa_ie_len = min(elem->len + 2,
1116                                                       MAX_WPA_IE_LEN);
1117                                 memcpy(bss->wpa_ie, elem, bss->wpa_ie_len);
1118                                 lbs_deb_hex(LBS_DEB_SCAN, "process_bss: WPA IE", bss->wpa_ie,
1119                                             elem->len);
1120                         } else if (elem->len >= MARVELL_MESH_IE_LENGTH &&
1121                             elem->data[0] == 0x00 &&
1122                             elem->data[1] == 0x50 &&
1123                             elem->data[2] == 0x43 &&
1124                             elem->data[3] == 0x04) {
1125                                 bss->mesh = 1;
1126                         }
1127                         break;
1128
1129                 case MFIE_TYPE_RSN:
1130                         bss->rsn_ie_len = min(elem->len + 2, MAX_WPA_IE_LEN);
1131                         memcpy(bss->rsn_ie, elem, bss->rsn_ie_len);
1132                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: RSN_IE", bss->rsn_ie, elem->len);
1133                         break;
1134
1135                 default:
1136                         break;
1137                 }
1138
1139                 pos += elem->len + 2;
1140         }
1141
1142         /* Timestamp */
1143         bss->last_scanned = jiffies;
1144         lbs_unset_basic_rate_flags(bss->rates, sizeof(bss->rates));
1145
1146         ret = 0;
1147
1148 done:
1149         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1150         return ret;
1151 }
1152
1153 /**
1154  *  @brief This function finds a specific compatible BSSID in the scan list
1155  *
1156  *  Used in association code
1157  *
1158  *  @param adapter  A pointer to lbs_adapter
1159  *  @param bssid    BSSID to find in the scan list
1160  *  @param mode     Network mode: Infrastructure or IBSS
1161  *
1162  *  @return         index in BSSID list, or error return code (< 0)
1163  */
1164 struct bss_descriptor *lbs_find_bssid_in_list(lbs_adapter *adapter,
1165                 u8 * bssid, u8 mode)
1166 {
1167         struct bss_descriptor * iter_bss;
1168         struct bss_descriptor * found_bss = NULL;
1169
1170         lbs_deb_enter(LBS_DEB_SCAN);
1171
1172         if (!bssid)
1173                 goto out;
1174
1175         lbs_deb_hex(LBS_DEB_SCAN, "looking for",
1176                 bssid, ETH_ALEN);
1177
1178         /* Look through the scan table for a compatible match.  The loop will
1179          *   continue past a matched bssid that is not compatible in case there
1180          *   is an AP with multiple SSIDs assigned to the same BSSID
1181          */
1182         mutex_lock(&adapter->lock);
1183         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1184                 if (compare_ether_addr(iter_bss->bssid, bssid))
1185                         continue; /* bssid doesn't match */
1186                 switch (mode) {
1187                 case IW_MODE_INFRA:
1188                 case IW_MODE_ADHOC:
1189                         if (!is_network_compatible(adapter, iter_bss, mode))
1190                                 break;
1191                         found_bss = iter_bss;
1192                         break;
1193                 default:
1194                         found_bss = iter_bss;
1195                         break;
1196                 }
1197         }
1198         mutex_unlock(&adapter->lock);
1199
1200 out:
1201         lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss);
1202         return found_bss;
1203 }
1204
1205 /**
1206  *  @brief This function finds ssid in ssid list.
1207  *
1208  *  Used in association code
1209  *
1210  *  @param adapter  A pointer to lbs_adapter
1211  *  @param ssid     SSID to find in the list
1212  *  @param bssid    BSSID to qualify the SSID selection (if provided)
1213  *  @param mode     Network mode: Infrastructure or IBSS
1214  *
1215  *  @return         index in BSSID list
1216  */
1217 struct bss_descriptor *lbs_find_ssid_in_list(lbs_adapter *adapter,
1218                    u8 *ssid, u8 ssid_len, u8 * bssid, u8 mode,
1219                    int channel)
1220 {
1221         u8 bestrssi = 0;
1222         struct bss_descriptor * iter_bss = NULL;
1223         struct bss_descriptor * found_bss = NULL;
1224         struct bss_descriptor * tmp_oldest = NULL;
1225
1226         lbs_deb_enter(LBS_DEB_SCAN);
1227
1228         mutex_lock(&adapter->lock);
1229
1230         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1231                 if (   !tmp_oldest
1232                     || (iter_bss->last_scanned < tmp_oldest->last_scanned))
1233                         tmp_oldest = iter_bss;
1234
1235                 if (lbs_ssid_cmp(iter_bss->ssid, iter_bss->ssid_len,
1236                                       ssid, ssid_len) != 0)
1237                         continue; /* ssid doesn't match */
1238                 if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
1239                         continue; /* bssid doesn't match */
1240                 if ((channel > 0) && (iter_bss->channel != channel))
1241                         continue; /* channel doesn't match */
1242
1243                 switch (mode) {
1244                 case IW_MODE_INFRA:
1245                 case IW_MODE_ADHOC:
1246                         if (!is_network_compatible(adapter, iter_bss, mode))
1247                                 break;
1248
1249                         if (bssid) {
1250                                 /* Found requested BSSID */
1251                                 found_bss = iter_bss;
1252                                 goto out;
1253                         }
1254
1255                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1256                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1257                                 found_bss = iter_bss;
1258                         }
1259                         break;
1260                 case IW_MODE_AUTO:
1261                 default:
1262                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1263                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1264                                 found_bss = iter_bss;
1265                         }
1266                         break;
1267                 }
1268         }
1269
1270 out:
1271         mutex_unlock(&adapter->lock);
1272         lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss);
1273         return found_bss;
1274 }
1275
1276 /**
1277  *  @brief This function finds the best SSID in the Scan List
1278  *
1279  *  Search the scan table for the best SSID that also matches the current
1280  *   adapter network preference (infrastructure or adhoc)
1281  *
1282  *  @param adapter  A pointer to lbs_adapter
1283  *
1284  *  @return         index in BSSID list
1285  */
1286 static struct bss_descriptor *lbs_find_best_ssid_in_list(lbs_adapter *adapter,
1287                 u8 mode)
1288 {
1289         u8 bestrssi = 0;
1290         struct bss_descriptor * iter_bss;
1291         struct bss_descriptor * best_bss = NULL;
1292
1293         lbs_deb_enter(LBS_DEB_SCAN);
1294
1295         mutex_lock(&adapter->lock);
1296
1297         list_for_each_entry (iter_bss, &adapter->network_list, list) {
1298                 switch (mode) {
1299                 case IW_MODE_INFRA:
1300                 case IW_MODE_ADHOC:
1301                         if (!is_network_compatible(adapter, iter_bss, mode))
1302                                 break;
1303                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1304                                 break;
1305                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1306                         best_bss = iter_bss;
1307                         break;
1308                 case IW_MODE_AUTO:
1309                 default:
1310                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1311                                 break;
1312                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1313                         best_bss = iter_bss;
1314                         break;
1315                 }
1316         }
1317
1318         mutex_unlock(&adapter->lock);
1319         lbs_deb_leave_args(LBS_DEB_SCAN, "best_bss %p", best_bss);
1320         return best_bss;
1321 }
1322
1323 /**
1324  *  @brief Find the AP with specific ssid in the scan list
1325  *
1326  *  Used from association worker.
1327  *
1328  *  @param priv         A pointer to lbs_private structure
1329  *  @param pSSID        A pointer to AP's ssid
1330  *
1331  *  @return             0--success, otherwise--fail
1332  */
1333 int lbs_find_best_network_ssid(lbs_private *priv,
1334                 u8 *out_ssid, u8 *out_ssid_len, u8 preferred_mode, u8 *out_mode)
1335 {
1336         lbs_adapter *adapter = priv->adapter;
1337         int ret = -1;
1338         struct bss_descriptor * found;
1339
1340         lbs_deb_enter(LBS_DEB_SCAN);
1341
1342         lbs_scan_networks(priv, NULL, 1);
1343         if (adapter->surpriseremoved)
1344                 goto out;
1345
1346         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1347
1348         found = lbs_find_best_ssid_in_list(adapter, preferred_mode);
1349         if (found && (found->ssid_len > 0)) {
1350                 memcpy(out_ssid, &found->ssid, IW_ESSID_MAX_SIZE);
1351                 *out_ssid_len = found->ssid_len;
1352                 *out_mode = found->mode;
1353                 ret = 0;
1354         }
1355
1356 out:
1357         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1358         return ret;
1359 }
1360
1361 /**
1362  *  @brief Scan Network
1363  *
1364  *  @param dev          A pointer to net_device structure
1365  *  @param info         A pointer to iw_request_info structure
1366  *  @param vwrq         A pointer to iw_param structure
1367  *  @param extra        A pointer to extra data buf
1368  *
1369  *  @return             0 --success, otherwise fail
1370  */
1371 int lbs_set_scan(struct net_device *dev, struct iw_request_info *info,
1372                   struct iw_param *vwrq, char *extra)
1373 {
1374         lbs_private *priv = dev->priv;
1375         lbs_adapter *adapter = priv->adapter;
1376
1377         lbs_deb_enter(LBS_DEB_SCAN);
1378
1379         if (!delayed_work_pending(&priv->scan_work)) {
1380                 queue_delayed_work(priv->work_thread, &priv->scan_work,
1381                                    msecs_to_jiffies(50));
1382         }
1383
1384         if (adapter->surpriseremoved)
1385                 return -1;
1386
1387         lbs_deb_leave(LBS_DEB_SCAN);
1388         return 0;
1389 }
1390
1391
1392 /**
1393  *  @brief Send a scan command for all available channels filtered on a spec
1394  *
1395  *  Used in association code and from debugfs
1396  *
1397  *  @param priv             A pointer to lbs_private structure
1398  *  @param ssid             A pointer to the SSID to scan for
1399  *  @param ssid_len         Length of the SSID
1400  *  @param clear_ssid       Should existing scan results with this SSID
1401  *                          be cleared?
1402  *  @param prequestedssid   A pointer to AP's ssid
1403  *  @param keeppreviousscan Flag used to save/clear scan table before scan
1404  *
1405  *  @return                0-success, otherwise fail
1406  */
1407 int lbs_send_specific_ssid_scan(lbs_private *priv,
1408                         u8 *ssid, u8 ssid_len, u8 clear_ssid)
1409 {
1410         lbs_adapter *adapter = priv->adapter;
1411         struct lbs_ioctl_user_scan_cfg scancfg;
1412         int ret = 0;
1413
1414         lbs_deb_enter_args(LBS_DEB_SCAN, "SSID '%s', clear %d",
1415                 escape_essid(ssid, ssid_len), clear_ssid);
1416
1417         if (!ssid_len)
1418                 goto out;
1419
1420         memset(&scancfg, 0x00, sizeof(scancfg));
1421         memcpy(scancfg.ssid, ssid, ssid_len);
1422         scancfg.ssid_len = ssid_len;
1423         scancfg.clear_ssid = clear_ssid;
1424
1425         lbs_scan_networks(priv, &scancfg, 1);
1426         if (adapter->surpriseremoved) {
1427                 ret = -1;
1428                 goto out;
1429         }
1430         wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1431
1432 out:
1433         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1434         return ret;
1435 }
1436
1437
1438
1439
1440 /*********************************************************************/
1441 /*                                                                   */
1442 /*  Support for Wireless Extensions                                  */
1443 /*                                                                   */
1444 /*********************************************************************/
1445
1446 #define MAX_CUSTOM_LEN 64
1447
1448 static inline char *lbs_translate_scan(lbs_private *priv,
1449                                         char *start, char *stop,
1450                                         struct bss_descriptor *bss)
1451 {
1452         lbs_adapter *adapter = priv->adapter;
1453         struct chan_freq_power *cfp;
1454         char *current_val;      /* For rates */
1455         struct iw_event iwe;    /* Temporary buffer */
1456         int j;
1457 #define PERFECT_RSSI ((u8)50)
1458 #define WORST_RSSI   ((u8)0)
1459 #define RSSI_DIFF    ((u8)(PERFECT_RSSI - WORST_RSSI))
1460         u8 rssi;
1461
1462         lbs_deb_enter(LBS_DEB_SCAN);
1463
1464         cfp = lbs_find_cfp_by_band_and_channel(adapter, 0, bss->channel);
1465         if (!cfp) {
1466                 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1467                 start = NULL;
1468                 goto out;
1469         }
1470
1471         /* First entry *MUST* be the AP BSSID */
1472         iwe.cmd = SIOCGIWAP;
1473         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1474         memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1475         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1476
1477         /* SSID */
1478         iwe.cmd = SIOCGIWESSID;
1479         iwe.u.data.flags = 1;
1480         iwe.u.data.length = min((u32) bss->ssid_len, (u32) IW_ESSID_MAX_SIZE);
1481         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1482
1483         /* Mode */
1484         iwe.cmd = SIOCGIWMODE;
1485         iwe.u.mode = bss->mode;
1486         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1487
1488         /* Frequency */
1489         iwe.cmd = SIOCGIWFREQ;
1490         iwe.u.freq.m = (long)cfp->freq * 100000;
1491         iwe.u.freq.e = 1;
1492         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1493
1494         /* Add quality statistics */
1495         iwe.cmd = IWEVQUAL;
1496         iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1497         iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1498
1499         rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1500         iwe.u.qual.qual =
1501             (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1502              (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1503             (RSSI_DIFF * RSSI_DIFF);
1504         if (iwe.u.qual.qual > 100)
1505                 iwe.u.qual.qual = 100;
1506
1507         if (adapter->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1508                 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1509         } else {
1510                 iwe.u.qual.noise =
1511                     CAL_NF(adapter->NF[TYPE_BEACON][TYPE_NOAVG]);
1512         }
1513
1514         /* Locally created ad-hoc BSSs won't have beacons if this is the
1515          * only station in the adhoc network; so get signal strength
1516          * from receive statistics.
1517          */
1518         if ((adapter->mode == IW_MODE_ADHOC)
1519             && adapter->adhoccreate
1520             && !lbs_ssid_cmp(adapter->curbssparams.ssid,
1521                                   adapter->curbssparams.ssid_len,
1522                                   bss->ssid, bss->ssid_len)) {
1523                 int snr, nf;
1524                 snr = adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1525                 nf = adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1526                 iwe.u.qual.level = CAL_RSSI(snr, nf);
1527         }
1528         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
1529
1530         /* Add encryption capability */
1531         iwe.cmd = SIOCGIWENCODE;
1532         if (bss->capability & WLAN_CAPABILITY_PRIVACY) {
1533                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1534         } else {
1535                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1536         }
1537         iwe.u.data.length = 0;
1538         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1539
1540         current_val = start + IW_EV_LCP_LEN;
1541
1542         iwe.cmd = SIOCGIWRATE;
1543         iwe.u.bitrate.fixed = 0;
1544         iwe.u.bitrate.disabled = 0;
1545         iwe.u.bitrate.value = 0;
1546
1547         for (j = 0; bss->rates[j] && (j < sizeof(bss->rates)); j++) {
1548                 /* Bit rate given in 500 kb/s units */
1549                 iwe.u.bitrate.value = bss->rates[j] * 500000;
1550                 current_val = iwe_stream_add_value(start, current_val,
1551                                          stop, &iwe, IW_EV_PARAM_LEN);
1552         }
1553         if ((bss->mode == IW_MODE_ADHOC)
1554             && !lbs_ssid_cmp(adapter->curbssparams.ssid,
1555                                   adapter->curbssparams.ssid_len,
1556                                   bss->ssid, bss->ssid_len)
1557             && adapter->adhoccreate) {
1558                 iwe.u.bitrate.value = 22 * 500000;
1559                 current_val = iwe_stream_add_value(start, current_val,
1560                                          stop, &iwe, IW_EV_PARAM_LEN);
1561         }
1562         /* Check if we added any event */
1563         if((current_val - start) > IW_EV_LCP_LEN)
1564                 start = current_val;
1565
1566         memset(&iwe, 0, sizeof(iwe));
1567         if (bss->wpa_ie_len) {
1568                 char buf[MAX_WPA_IE_LEN];
1569                 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1570                 iwe.cmd = IWEVGENIE;
1571                 iwe.u.data.length = bss->wpa_ie_len;
1572                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1573         }
1574
1575         memset(&iwe, 0, sizeof(iwe));
1576         if (bss->rsn_ie_len) {
1577                 char buf[MAX_WPA_IE_LEN];
1578                 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1579                 iwe.cmd = IWEVGENIE;
1580                 iwe.u.data.length = bss->rsn_ie_len;
1581                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1582         }
1583
1584         if (bss->mesh) {
1585                 char custom[MAX_CUSTOM_LEN];
1586                 char *p = custom;
1587
1588                 iwe.cmd = IWEVCUSTOM;
1589                 p += snprintf(p, MAX_CUSTOM_LEN - (p - custom),
1590                               "mesh-type: olpc");
1591                 iwe.u.data.length = p - custom;
1592                 if (iwe.u.data.length)
1593                         start = iwe_stream_add_point(start, stop, &iwe, custom);
1594         }
1595
1596 out:
1597         lbs_deb_leave_args(LBS_DEB_SCAN, "start %p", start);
1598         return start;
1599 }
1600
1601 /**
1602  *  @brief  Handle Retrieve scan table ioctl
1603  *
1604  *  @param dev          A pointer to net_device structure
1605  *  @param info         A pointer to iw_request_info structure
1606  *  @param dwrq         A pointer to iw_point structure
1607  *  @param extra        A pointer to extra data buf
1608  *
1609  *  @return             0 --success, otherwise fail
1610  */
1611 int lbs_get_scan(struct net_device *dev, struct iw_request_info *info,
1612                   struct iw_point *dwrq, char *extra)
1613 {
1614 #define SCAN_ITEM_SIZE 128
1615         lbs_private *priv = dev->priv;
1616         lbs_adapter *adapter = priv->adapter;
1617         int err = 0;
1618         char *ev = extra;
1619         char *stop = ev + dwrq->length;
1620         struct bss_descriptor * iter_bss;
1621         struct bss_descriptor * safe;
1622
1623         lbs_deb_enter(LBS_DEB_SCAN);
1624
1625         /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1626         if ((adapter->mode == IW_MODE_ADHOC) && adapter->adhoccreate) {
1627                 lbs_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
1628                                         CMD_OPTION_WAITFORRSP, 0, NULL);
1629         }
1630
1631         mutex_lock(&adapter->lock);
1632         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1633                 char * next_ev;
1634                 unsigned long stale_time;
1635
1636                 if (stop - ev < SCAN_ITEM_SIZE) {
1637                         err = -E2BIG;
1638                         break;
1639                 }
1640
1641                 /* For mesh device, list only mesh networks */
1642                 if (dev == priv->mesh_dev && !iter_bss->mesh)
1643                         continue;
1644
1645                 /* Prune old an old scan result */
1646                 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1647                 if (time_after(jiffies, stale_time)) {
1648                         list_move_tail (&iter_bss->list,
1649                                         &adapter->network_free_list);
1650                         clear_bss_descriptor(iter_bss);
1651                         continue;
1652                 }
1653
1654                 /* Translate to WE format this entry */
1655                 next_ev = lbs_translate_scan(priv, ev, stop, iter_bss);
1656                 if (next_ev == NULL)
1657                         continue;
1658                 ev = next_ev;
1659         }
1660         mutex_unlock(&adapter->lock);
1661
1662         dwrq->length = (ev - extra);
1663         dwrq->flags = 0;
1664
1665         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", err);
1666         return err;
1667 }
1668
1669
1670
1671
1672 /*********************************************************************/
1673 /*                                                                   */
1674 /*  Command execution                                                */
1675 /*                                                                   */
1676 /*********************************************************************/
1677
1678
1679 /**
1680  *  @brief Prepare a scan command to be sent to the firmware
1681  *
1682  *  Called from lbs_prepare_and_send_command() in cmd.c
1683  *
1684  *  Sends a fixed lenght data part (specifying the BSS type and BSSID filters)
1685  *  as well as a variable number/length of TLVs to the firmware.
1686  *
1687  *  @param priv       A pointer to lbs_private structure
1688  *  @param cmd        A pointer to cmd_ds_command structure to be sent to
1689  *                    firmware with the cmd_DS_801_11_SCAN structure
1690  *  @param pdata_buf  Void pointer cast of a lbs_scan_cmd_config struct used
1691  *                    to set the fields/TLVs for the command sent to firmware
1692  *
1693  *  @return           0 or -1
1694  */
1695 int lbs_cmd_80211_scan(lbs_private *priv,
1696                          struct cmd_ds_command *cmd, void *pdata_buf)
1697 {
1698         struct cmd_ds_802_11_scan *pscan = &cmd->params.scan;
1699         struct lbs_scan_cmd_config *pscancfg = pdata_buf;
1700
1701         lbs_deb_enter(LBS_DEB_SCAN);
1702
1703         /* Set fixed field variables in scan command */
1704         pscan->bsstype = pscancfg->bsstype;
1705         memcpy(pscan->bssid, pscancfg->bssid, ETH_ALEN);
1706         memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen);
1707
1708         cmd->command = cpu_to_le16(CMD_802_11_SCAN);
1709
1710         /* size is equal to the sizeof(fixed portions) + the TLV len + header */
1711         cmd->size = cpu_to_le16(sizeof(pscan->bsstype) + ETH_ALEN
1712                                 + pscancfg->tlvbufferlen + S_DS_GEN);
1713
1714         lbs_deb_scan("SCAN_CMD: command 0x%04x, size %d, seqnum %d\n",
1715                      le16_to_cpu(cmd->command), le16_to_cpu(cmd->size),
1716                      le16_to_cpu(cmd->seqnum));
1717
1718         lbs_deb_leave(LBS_DEB_SCAN);
1719         return 0;
1720 }
1721
1722 static inline int is_same_network(struct bss_descriptor *src,
1723                                   struct bss_descriptor *dst)
1724 {
1725         /* A network is only a duplicate if the channel, BSSID, and ESSID
1726          * all match.  We treat all <hidden> with the same BSSID and channel
1727          * as one network */
1728         return ((src->ssid_len == dst->ssid_len) &&
1729                 (src->channel == dst->channel) &&
1730                 !compare_ether_addr(src->bssid, dst->bssid) &&
1731                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1732 }
1733
1734 /**
1735  *  @brief This function handles the command response of scan
1736  *
1737  *  Called from handle_cmd_response() in cmdrespc.
1738  *
1739  *   The response buffer for the scan command has the following
1740  *      memory layout:
1741  *
1742  *     .-----------------------------------------------------------.
1743  *     |  header (4 * sizeof(u16)):  Standard command response hdr |
1744  *     .-----------------------------------------------------------.
1745  *     |  bufsize (u16) : sizeof the BSS Description data          |
1746  *     .-----------------------------------------------------------.
1747  *     |  NumOfSet (u8) : Number of BSS Descs returned             |
1748  *     .-----------------------------------------------------------.
1749  *     |  BSSDescription data (variable, size given in bufsize)    |
1750  *     .-----------------------------------------------------------.
1751  *     |  TLV data (variable, size calculated using header->size,  |
1752  *     |            bufsize and sizeof the fixed fields above)     |
1753  *     .-----------------------------------------------------------.
1754  *
1755  *  @param priv    A pointer to lbs_private structure
1756  *  @param resp    A pointer to cmd_ds_command
1757  *
1758  *  @return        0 or -1
1759  */
1760 int lbs_ret_80211_scan(lbs_private *priv, struct cmd_ds_command *resp)
1761 {
1762         lbs_adapter *adapter = priv->adapter;
1763         struct cmd_ds_802_11_scan_rsp *pscan;
1764         struct bss_descriptor * iter_bss;
1765         struct bss_descriptor * safe;
1766         u8 *pbssinfo;
1767         u16 scanrespsize;
1768         int bytesleft;
1769         int idx;
1770         int tlvbufsize;
1771         int ret;
1772
1773         lbs_deb_enter(LBS_DEB_SCAN);
1774
1775         /* Prune old entries from scan table */
1776         list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1777                 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1778                 if (time_before(jiffies, stale_time))
1779                         continue;
1780                 list_move_tail (&iter_bss->list, &adapter->network_free_list);
1781                 clear_bss_descriptor(iter_bss);
1782         }
1783
1784         pscan = &resp->params.scanresp;
1785
1786         if (pscan->nr_sets > MAX_NETWORK_COUNT) {
1787                 lbs_deb_scan(
1788                        "SCAN_RESP: too many scan results (%d, max %d)!!\n",
1789                        pscan->nr_sets, MAX_NETWORK_COUNT);
1790                 ret = -1;
1791                 goto done;
1792         }
1793
1794         bytesleft = le16_to_cpu(get_unaligned((u16*)&pscan->bssdescriptsize));
1795         lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1796
1797         scanrespsize = le16_to_cpu(get_unaligned((u16*)&resp->size));
1798         lbs_deb_scan("SCAN_RESP: returned %d AP before parsing\n",
1799                pscan->nr_sets);
1800
1801         pbssinfo = pscan->bssdesc_and_tlvbuffer;
1802
1803         /* The size of the TLV buffer is equal to the entire command response
1804          *   size (scanrespsize) minus the fixed fields (sizeof()'s), the
1805          *   BSS Descriptions (bssdescriptsize as bytesLef) and the command
1806          *   response header (S_DS_GEN)
1807          */
1808         tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize)
1809                                      + sizeof(pscan->nr_sets)
1810                                      + S_DS_GEN);
1811
1812         /*
1813          *  Process each scan response returned (pscan->nr_sets).  Save
1814          *    the information in the newbssentry and then insert into the
1815          *    driver scan table either as an update to an existing entry
1816          *    or as an addition at the end of the table
1817          */
1818         for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) {
1819                 struct bss_descriptor new;
1820                 struct bss_descriptor * found = NULL;
1821                 struct bss_descriptor * oldest = NULL;
1822                 DECLARE_MAC_BUF(mac);
1823
1824                 /* Process the data fields and IEs returned for this BSS */
1825                 memset(&new, 0, sizeof (struct bss_descriptor));
1826                 if (lbs_process_bss(&new, &pbssinfo, &bytesleft) != 0) {
1827                         /* error parsing the scan response, skipped */
1828                         lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1829                         continue;
1830                 }
1831
1832                 /* Try to find this bss in the scan table */
1833                 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1834                         if (is_same_network(iter_bss, &new)) {
1835                                 found = iter_bss;
1836                                 break;
1837                         }
1838
1839                         if ((oldest == NULL) ||
1840                             (iter_bss->last_scanned < oldest->last_scanned))
1841                                 oldest = iter_bss;
1842                 }
1843
1844                 if (found) {
1845                         /* found, clear it */
1846                         clear_bss_descriptor(found);
1847                 } else if (!list_empty(&adapter->network_free_list)) {
1848                         /* Pull one from the free list */
1849                         found = list_entry(adapter->network_free_list.next,
1850                                            struct bss_descriptor, list);
1851                         list_move_tail(&found->list, &adapter->network_list);
1852                 } else if (oldest) {
1853                         /* If there are no more slots, expire the oldest */
1854                         found = oldest;
1855                         clear_bss_descriptor(found);
1856                         list_move_tail(&found->list, &adapter->network_list);
1857                 } else {
1858                         continue;
1859                 }
1860
1861                 lbs_deb_scan("SCAN_RESP: BSSID = %s\n",
1862                              print_mac(mac, new.bssid));
1863
1864                 /* Copy the locally created newbssentry to the scan table */
1865                 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1866         }
1867
1868         ret = 0;
1869
1870 done:
1871         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1872         return ret;
1873 }