err.no Git - linux-2.6/blob - drivers/net/wireless/libertas/scan.c

   1 /**
   2   * Functions implementing wlan scan IOCTL and firmware command APIs
   3   *
   4   * IOCTL handlers as well as command preperation and response routines
   5   *  for sending scan commands to the firmware.
   6   */
   7 #include <linux/ctype.h>
   8 #include <linux/if.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/wireless.h>
  11 #include <linux/etherdevice.h>
  12
  13 #include <net/ieee80211.h>
  14 #include <net/iw_handler.h>
  15
  16 #include <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 #include "cmd.h"
  24
  25 //! Approximate amount of data needed to pass a scan result back to iwlist
  26 #define MAX_SCAN_CELL_SIZE  (IW_EV_ADDR_LEN             \
  27                              + IW_ESSID_MAX_SIZE        \
  28                              + IW_EV_UINT_LEN           \
  29                              + IW_EV_FREQ_LEN           \
  30                              + IW_EV_QUAL_LEN           \
  31                              + IW_ESSID_MAX_SIZE        \
  32                              + IW_EV_PARAM_LEN          \
  33                              + 40)      /* 40 for WPAIE */
  34
  35 //! Memory needed to store a max sized channel List TLV for a firmware scan
  36 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mrvlietypesheader)    \
  37                             + (MRVDRV_MAX_CHANNELS_PER_SCAN     \
  38                                * sizeof(struct chanscanparamset)))
  39
  40 //! Memory needed to store a max number/size SSID TLV for a firmware scan
  41 #define SSID_TLV_MAX_SIZE  (1 * sizeof(struct mrvlietypes_ssidparamset))
  42
  43 //! Maximum memory needed for a cmd_ds_802_11_scan with all TLVs at max
  44 #define MAX_SCAN_CFG_ALLOC (sizeof(struct cmd_ds_802_11_scan)   \
  45                             + CHAN_TLV_MAX_SIZE + SSID_TLV_MAX_SIZE)
  46
  47 //! The maximum number of channels the firmware can scan per command
  48 #define MRVDRV_MAX_CHANNELS_PER_SCAN   14
  49
  50 /**
  51  * @brief Number of channels to scan per firmware scan command issuance.
  52  *
  53  *  Number restricted to prevent hitting the limit on the amount of scan data
  54  *  returned in a single firmware scan command.
  55  */
  56 #define MRVDRV_CHANNELS_PER_SCAN_CMD   4
  57
  58 //! Scan time specified in the channel TLV for each channel for passive scans
  59 #define MRVDRV_PASSIVE_SCAN_CHAN_TIME  100
  60
  61 //! Scan time specified in the channel TLV for each channel for active scans
  62 #define MRVDRV_ACTIVE_SCAN_CHAN_TIME   100
  63
  64 static int lbs_ret_80211_scan(struct lbs_private *priv, unsigned long dummy,
  65                               struct cmd_header *resp);
  66
  67 /*********************************************************************/
  68 /*                                                                   */
  69 /*  Misc helper functions                                            */
  70 /*                                                                   */
  71 /*********************************************************************/
  72
  73 /**
  74  *  @brief Unsets the MSB on basic rates
  75  *
  76  * Scan through an array and unset the MSB for basic data rates.
  77  *
  78  *  @param rates     buffer of data rates
  79  *  @param len       size of buffer
  80  */
  81 static void lbs_unset_basic_rate_flags(u8 *rates, size_t len)
  82 {
  83         int i;
  84
  85         for (i = 0; i < len; i++)
  86                 rates[i] &= 0x7f;
  87 }
  88
  89
  90 static inline void clear_bss_descriptor(struct bss_descriptor *bss)
  91 {
  92         /* Don't blow away ->list, just BSS data */
  93         memset(bss, 0, offsetof(struct bss_descriptor, list));
  94 }
  95
  96 /**
  97  *  @brief Compare two SSIDs
  98  *
  99  *  @param ssid1    A pointer to ssid to compare
 100  *  @param ssid2    A pointer to ssid to compare
 101  *
 102  *  @return         0: ssid is same, otherwise is different
 103  */
 104 int lbs_ssid_cmp(uint8_t *ssid1, uint8_t ssid1_len, uint8_t *ssid2,
 105                  uint8_t ssid2_len)
 106 {
 107         if (ssid1_len != ssid2_len)
 108                 return -1;
 109
 110         return memcmp(ssid1, ssid2, ssid1_len);
 111 }
 112
 113 static inline int match_bss_no_security(struct lbs_802_11_security *secinfo,
 114                                         struct bss_descriptor *match_bss)
 115 {
 116         if (!secinfo->wep_enabled  && !secinfo->WPAenabled
 117             && !secinfo->WPA2enabled
 118             && match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC
 119             && match_bss->rsn_ie[0] != MFIE_TYPE_RSN
 120             && !(match_bss->capability & WLAN_CAPABILITY_PRIVACY))
 121                 return 1;
 122         else
 123                 return 0;
 124 }
 125
 126 static inline int match_bss_static_wep(struct lbs_802_11_security *secinfo,
 127                                        struct bss_descriptor *match_bss)
 128 {
 129         if (secinfo->wep_enabled && !secinfo->WPAenabled
 130             && !secinfo->WPA2enabled
 131             && (match_bss->capability & WLAN_CAPABILITY_PRIVACY))
 132                 return 1;
 133         else
 134                 return 0;
 135 }
 136
 137 static inline int match_bss_wpa(struct lbs_802_11_security *secinfo,
 138                                 struct bss_descriptor *match_bss)
 139 {
 140         if (!secinfo->wep_enabled && secinfo->WPAenabled
 141             && (match_bss->wpa_ie[0] == MFIE_TYPE_GENERIC)
 142             /* privacy bit may NOT be set in some APs like LinkSys WRT54G
 143             && (match_bss->capability & WLAN_CAPABILITY_PRIVACY) */
 144            )
 145                 return 1;
 146         else
 147                 return 0;
 148 }
 149
 150 static inline int match_bss_wpa2(struct lbs_802_11_security *secinfo,
 151                                  struct bss_descriptor *match_bss)
 152 {
 153         if (!secinfo->wep_enabled && secinfo->WPA2enabled
 154             && (match_bss->rsn_ie[0] == MFIE_TYPE_RSN)
 155             /* privacy bit may NOT be set in some APs like LinkSys WRT54G
 156             && (match_bss->capability & WLAN_CAPABILITY_PRIVACY) */
 157            )
 158                 return 1;
 159         else
 160                 return 0;
 161 }
 162
 163 static inline int match_bss_dynamic_wep(struct lbs_802_11_security *secinfo,
 164                                         struct bss_descriptor *match_bss)
 165 {
 166         if (!secinfo->wep_enabled && !secinfo->WPAenabled
 167             && !secinfo->WPA2enabled
 168             && (match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC)
 169             && (match_bss->rsn_ie[0] != MFIE_TYPE_RSN)
 170             && (match_bss->capability & WLAN_CAPABILITY_PRIVACY))
 171                 return 1;
 172         else
 173                 return 0;
 174 }
 175
 176 static inline int is_same_network(struct bss_descriptor *src,
 177                                   struct bss_descriptor *dst)
 178 {
 179         /* A network is only a duplicate if the channel, BSSID, and ESSID
 180          * all match.  We treat all <hidden> with the same BSSID and channel
 181          * as one network */
 182         return ((src->ssid_len == dst->ssid_len) &&
 183                 (src->channel == dst->channel) &&
 184                 !compare_ether_addr(src->bssid, dst->bssid) &&
 185                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
 186 }
 187
 188 /**
 189  *  @brief Check if a scanned network compatible with the driver settings
 190  *
 191  *   WEP     WPA     WPA2    ad-hoc  encrypt                      Network
 192  * enabled enabled  enabled   AES     mode   privacy  WPA  WPA2  Compatible
 193  *    0       0        0       0      NONE      0      0    0   yes No security
 194  *    1       0        0       0      NONE      1      0    0   yes Static WEP
 195  *    0       1        0       0       x        1x     1    x   yes WPA
 196  *    0       0        1       0       x        1x     x    1   yes WPA2
 197  *    0       0        0       1      NONE      1      0    0   yes Ad-hoc AES
 198  *    0       0        0       0     !=NONE     1      0    0   yes Dynamic WEP
 199  *
 200  *
 201  *  @param priv A pointer to struct lbs_private
 202  *  @param index   Index in scantable to check against current driver settings
 203  *  @param mode    Network mode: Infrastructure or IBSS
 204  *
 205  *  @return        Index in scantable, or error code if negative
 206  */
 207 static int is_network_compatible(struct lbs_private *priv,
 208                                  struct bss_descriptor *bss, uint8_t mode)
 209 {
 210         int matched = 0;
 211
 212         lbs_deb_enter(LBS_DEB_SCAN);
 213
 214         if (bss->mode != mode)
 215                 goto done;
 216
 217         if ((matched = match_bss_no_security(&priv->secinfo, bss))) {
 218                 goto done;
 219         } else if ((matched = match_bss_static_wep(&priv->secinfo, bss))) {
 220                 goto done;
 221         } else if ((matched = match_bss_wpa(&priv->secinfo, bss))) {
 222                 lbs_deb_scan("is_network_compatible() WPA: wpa_ie 0x%x "
 223                              "wpa2_ie 0x%x WEP %s WPA %s WPA2 %s "
 224                              "privacy 0x%x\n", bss->wpa_ie[0], bss->rsn_ie[0],
 225                              priv->secinfo.wep_enabled ? "e" : "d",
 226                              priv->secinfo.WPAenabled ? "e" : "d",
 227                              priv->secinfo.WPA2enabled ? "e" : "d",
 228                              (bss->capability & WLAN_CAPABILITY_PRIVACY));
 229                 goto done;
 230         } else if ((matched = match_bss_wpa2(&priv->secinfo, bss))) {
 231                 lbs_deb_scan("is_network_compatible() WPA2: wpa_ie 0x%x "
 232                              "wpa2_ie 0x%x WEP %s WPA %s WPA2 %s "
 233                              "privacy 0x%x\n", bss->wpa_ie[0], bss->rsn_ie[0],
 234                              priv->secinfo.wep_enabled ? "e" : "d",
 235                              priv->secinfo.WPAenabled ? "e" : "d",
 236                              priv->secinfo.WPA2enabled ? "e" : "d",
 237                              (bss->capability & WLAN_CAPABILITY_PRIVACY));
 238                 goto done;
 239         } else if ((matched = match_bss_dynamic_wep(&priv->secinfo, bss))) {
 240                 lbs_deb_scan("is_network_compatible() dynamic WEP: "
 241                              "wpa_ie 0x%x wpa2_ie 0x%x privacy 0x%x\n",
 242                              bss->wpa_ie[0], bss->rsn_ie[0],
 243                              (bss->capability & WLAN_CAPABILITY_PRIVACY));
 244                 goto done;
 245         }
 246
 247         /* bss security settings don't match those configured on card */
 248         lbs_deb_scan("is_network_compatible() FAILED: wpa_ie 0x%x "
 249                      "wpa2_ie 0x%x WEP %s WPA %s WPA2 %s privacy 0x%x\n",
 250                      bss->wpa_ie[0], bss->rsn_ie[0],
 251                      priv->secinfo.wep_enabled ? "e" : "d",
 252                      priv->secinfo.WPAenabled ? "e" : "d",
 253                      priv->secinfo.WPA2enabled ? "e" : "d",
 254                      (bss->capability & WLAN_CAPABILITY_PRIVACY));
 255
 256 done:
 257         lbs_deb_leave_args(LBS_DEB_SCAN, "matched: %d", matched);
 258         return matched;
 259 }
 260
 261
 262
 263 /*********************************************************************/
 264 /*                                                                   */
 265 /*  Main scanning support                                            */
 266 /*                                                                   */
 267 /*********************************************************************/
 268
 269 /**
 270  *  @brief Create a channel list for the driver to scan based on region info
 271  *
 272  *  Only used from lbs_scan_setup_scan_config()
 273  *
 274  *  Use the driver region/band information to construct a comprehensive list
 275  *    of channels to scan.  This routine is used for any scan that is not
 276  *    provided a specific channel list to scan.
 277  *
 278  *  @param priv          A pointer to struct lbs_private structure
 279  *  @param scanchanlist  Output parameter: resulting channel list to scan
 280  *
 281  *  @return              void
 282  */
 283 static int lbs_scan_create_channel_list(struct lbs_private *priv,
 284                                         struct chanscanparamset *scanchanlist)
 285 {
 286         struct region_channel *scanregion;
 287         struct chan_freq_power *cfp;
 288         int rgnidx;
 289         int chanidx;
 290         int nextchan;
 291         uint8_t scantype;
 292
 293         chanidx = 0;
 294
 295         /* Set the default scan type to the user specified type, will later
 296          *   be changed to passive on a per channel basis if restricted by
 297          *   regulatory requirements (11d or 11h)
 298          */
 299         scantype = CMD_SCAN_TYPE_ACTIVE;
 300
 301         for (rgnidx = 0; rgnidx < ARRAY_SIZE(priv->region_channel); rgnidx++) {
 302                 if (priv->enable11d && (priv->connect_status != LBS_CONNECTED)
 303                     && (priv->mesh_connect_status != LBS_CONNECTED)) {
 304                         /* Scan all the supported chan for the first scan */
 305                         if (!priv->universal_channel[rgnidx].valid)
 306                                 continue;
 307                         scanregion = &priv->universal_channel[rgnidx];
 308
 309                         /* clear the parsed_region_chan for the first scan */
 310                         memset(&priv->parsed_region_chan, 0x00,
 311                                sizeof(priv->parsed_region_chan));
 312                 } else {
 313                         if (!priv->region_channel[rgnidx].valid)
 314                                 continue;
 315                         scanregion = &priv->region_channel[rgnidx];
 316                 }
 317
 318                 for (nextchan = 0; nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
 319                         struct chanscanparamset *chan = &scanchanlist[chanidx];
 320
 321                         cfp = scanregion->CFP + nextchan;
 322
 323                         if (priv->enable11d)
 324                                 scantype = lbs_get_scan_type_11d(cfp->channel,
 325                                                                  &priv->parsed_region_chan);
 326
 327                         if (scanregion->band == BAND_B || scanregion->band == BAND_G)
 328                                 chan->radiotype = CMD_SCAN_RADIO_TYPE_BG;
 329
 330                         if (scantype == CMD_SCAN_TYPE_PASSIVE) {
 331                                 chan->maxscantime = cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
 332                                 chan->chanscanmode.passivescan = 1;
 333                         } else {
 334                                 chan->maxscantime = cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
 335                                 chan->chanscanmode.passivescan = 0;
 336                         }
 337
 338                         chan->channumber = cfp->channel;
 339                 }
 340         }
 341         return chanidx;
 342 }
 343
 344
 345 /*
 346  * Add SSID TLV of the form:
 347  *
 348  * TLV-ID SSID     00 00
 349  * length          06 00
 350  * ssid            4d 4e 54 45 53 54
 351  */
 352 static int lbs_scan_add_ssid_tlv(struct lbs_private *priv, u8 *tlv)
 353 {
 354         struct mrvlietypes_ssidparamset *ssid_tlv = (void *)tlv;
 355
 356         ssid_tlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
 357         ssid_tlv->header.len = cpu_to_le16(priv->scan_ssid_len);
 358         memcpy(ssid_tlv->ssid, priv->scan_ssid, priv->scan_ssid_len);
 359         return sizeof(ssid_tlv->header) + priv->scan_ssid_len;
 360 }
 361
 362
 363 /*
 364  * Add CHANLIST TLV of the form
 365  *
 366  * TLV-ID CHANLIST 01 01
 367  * length          5b 00
 368  * channel 1       00 01 00 00 00 64 00
 369  *   radio type    00
 370  *   channel          01
 371  *   scan type           00
 372  *   min scan time          00 00
 373  *   max scan time                64 00
 374  * channel 2       00 02 00 00 00 64 00
 375  * channel 3       00 03 00 00 00 64 00
 376  * channel 4       00 04 00 00 00 64 00
 377  * channel 5       00 05 00 00 00 64 00
 378  * channel 6       00 06 00 00 00 64 00
 379  * channel 7       00 07 00 00 00 64 00
 380  * channel 8       00 08 00 00 00 64 00
 381  * channel 9       00 09 00 00 00 64 00
 382  * channel 10      00 0a 00 00 00 64 00
 383  * channel 11      00 0b 00 00 00 64 00
 384  * channel 12      00 0c 00 00 00 64 00
 385  * channel 13      00 0d 00 00 00 64 00
 386  *
 387  */
 388 static int lbs_scan_add_chanlist_tlv(uint8_t *tlv,
 389                                      struct chanscanparamset *chan_list,
 390                                      int chan_count)
 391 {
 392         size_t size = sizeof(struct chanscanparamset) *chan_count;
 393         struct mrvlietypes_chanlistparamset *chan_tlv = (void *)tlv;
 394
 395         chan_tlv->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 396         memcpy(chan_tlv->chanscanparam, chan_list, size);
 397         chan_tlv->header.len = cpu_to_le16(size);
 398         return sizeof(chan_tlv->header) + size;
 399 }
 400
 401
 402 /*
 403  * Add RATES TLV of the form
 404  *
 405  * TLV-ID RATES    01 00
 406  * length          0e 00
 407  * rates           82 84 8b 96 0c 12 18 24 30 48 60 6c
 408  *
 409  * The rates are in lbs_bg_rates[], but for the 802.11b
 410  * rates the high bit isn't set.
 411  */
 412 static int lbs_scan_add_rates_tlv(uint8_t *tlv)
 413 {
 414         int i;
 415         struct mrvlietypes_ratesparamset *rate_tlv = (void *)tlv;
 416
 417         rate_tlv->header.type = cpu_to_le16(TLV_TYPE_RATES);
 418         tlv += sizeof(rate_tlv->header);
 419         for (i = 0; i < MAX_RATES; i++) {
 420                 *tlv = lbs_bg_rates[i];
 421                 if (*tlv == 0)
 422                         break;
 423                 /* This code makes sure that the 802.11b rates (1 MBit/s, 2
 424                    MBit/s, 5.5 MBit/s and 11 MBit/s get's the high bit set.
 425                    Note that the values are MBit/s * 2, to mark them as
 426                    basic rates so that the firmware likes it better */
 427                 if (*tlv == 0x02 || *tlv == 0x04 ||
 428                     *tlv == 0x0b || *tlv == 0x16)
 429                         *tlv |= 0x80;
 430                 tlv++;
 431         }
 432         rate_tlv->header.len = cpu_to_le16(i);
 433         return sizeof(rate_tlv->header) + i;
 434 }
 435
 436
 437 /*
 438  * Generate the CMD_802_11_SCAN command with the proper tlv
 439  * for a bunch of channels.
 440  */
 441 static int lbs_do_scan(struct lbs_private *priv, uint8_t bsstype,
 442                        struct chanscanparamset *chan_list, int chan_count)
 443 {
 444         int ret = -ENOMEM;
 445         struct cmd_ds_802_11_scan *scan_cmd;
 446         uint8_t *tlv;   /* pointer into our current, growing TLV storage area */
 447
 448         lbs_deb_enter_args(LBS_DEB_SCAN, "bsstype %d, chanlist[].chan %d, chan_count %d",
 449                            bsstype, chan_list[0].channumber, chan_count);
 450
 451         /* create the fixed part for scan command */
 452         scan_cmd = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
 453         if (scan_cmd == NULL)
 454                 goto out;
 455
 456         tlv = scan_cmd->tlvbuffer;
 457         /* TODO: do we need to scan for a specific BSSID?
 458         memcpy(scan_cmd->bssid, priv->scan_bssid, ETH_ALEN); */
 459         scan_cmd->bsstype = bsstype;
 460
 461         /* add TLVs */
 462         if (priv->scan_ssid_len)
 463                 tlv += lbs_scan_add_ssid_tlv(priv, tlv);
 464         if (chan_list && chan_count)
 465                 tlv += lbs_scan_add_chanlist_tlv(tlv, chan_list, chan_count);
 466         tlv += lbs_scan_add_rates_tlv(tlv);
 467
 468         /* This is the final data we are about to send */
 469         scan_cmd->hdr.size = cpu_to_le16(tlv - (uint8_t *)scan_cmd);
 470         lbs_deb_hex(LBS_DEB_SCAN, "SCAN_CMD", (void *)scan_cmd,
 471                     sizeof(*scan_cmd));
 472         lbs_deb_hex(LBS_DEB_SCAN, "SCAN_TLV", scan_cmd->tlvbuffer,
 473                     tlv - scan_cmd->tlvbuffer);
 474
 475         ret = __lbs_cmd(priv, CMD_802_11_SCAN, &scan_cmd->hdr,
 476                         le16_to_cpu(scan_cmd->hdr.size),
 477                         lbs_ret_80211_scan, 0);
 478
 479 out:
 480         kfree(scan_cmd);
 481         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 482         return ret;
 483 }
 484
 485
 486 /**
 487  *  @brief Internal function used to start a scan based on an input config
 488  *
 489  *  Also used from debugfs
 490  *
 491  *  Use the input user scan configuration information when provided in
 492  *    order to send the appropriate scan commands to firmware to populate or
 493  *    update the internal driver scan table
 494  *
 495  *  @param priv          A pointer to struct lbs_private structure
 496  *  @param full_scan     Do a full-scan (blocking)
 497  *
 498  *  @return              0 or < 0 if error
 499  */
 500 static int lbs_scan_networks(struct lbs_private *priv, int full_scan)
 501 {
 502         int ret = -ENOMEM;
 503         struct chanscanparamset *chan_list;
 504         struct chanscanparamset *curr_chans;
 505         int chan_count;
 506         uint8_t bsstype = CMD_BSS_TYPE_ANY;
 507         int numchannels = MRVDRV_CHANNELS_PER_SCAN_CMD;
 508         union iwreq_data wrqu;
 509 #ifdef CONFIG_LIBERTAS_DEBUG
 510         struct bss_descriptor *iter;
 511         int i = 0;
 512         DECLARE_MAC_BUF(mac);
 513 #endif
 514
 515         lbs_deb_enter_args(LBS_DEB_SCAN, "full_scan %d", full_scan);
 516
 517         /* Cancel any partial outstanding partial scans if this scan
 518          * is a full scan.
 519          */
 520         if (full_scan && delayed_work_pending(&priv->scan_work))
 521                 cancel_delayed_work(&priv->scan_work);
 522
 523         /* User-specified bsstype or channel list
 524         TODO: this can be implemented if some user-space application
 525         need the feature. Formerly, it was accessible from debugfs,
 526         but then nowhere used.
 527         if (user_cfg) {
 528                 if (user_cfg->bsstype)
 529                 bsstype = user_cfg->bsstype;
 530         } */
 531
 532         lbs_deb_scan("numchannels %d, bsstype %d\n", numchannels, bsstype);
 533
 534         /* Create list of channels to scan */
 535         chan_list = kzalloc(sizeof(struct chanscanparamset) *
 536                             LBS_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
 537         if (!chan_list) {
 538                 lbs_pr_alert("SCAN: chan_list empty\n");
 539                 goto out;
 540         }
 541
 542         /* We want to scan all channels */
 543         chan_count = lbs_scan_create_channel_list(priv, chan_list);
 544
 545         netif_stop_queue(priv->dev);
 546         netif_carrier_off(priv->dev);
 547         if (priv->mesh_dev) {
 548                 netif_stop_queue(priv->mesh_dev);
 549                 netif_carrier_off(priv->mesh_dev);
 550         }
 551
 552         /* Prepare to continue an interrupted scan */
 553         lbs_deb_scan("chan_count %d, scan_channel %d\n",
 554                      chan_count, priv->scan_channel);
 555         curr_chans = chan_list;
 556         /* advance channel list by already-scanned-channels */
 557         if (priv->scan_channel > 0) {
 558                 curr_chans += priv->scan_channel;
 559                 chan_count -= priv->scan_channel;
 560         }
 561
 562         /* Send scan command(s)
 563          * numchannels contains the number of channels we should maximally scan
 564          * chan_count is the total number of channels to scan
 565          */
 566
 567         while (chan_count) {
 568                 int to_scan = min(numchannels, chan_count);
 569                 lbs_deb_scan("scanning %d of %d channels\n",
 570                              to_scan, chan_count);
 571                 ret = lbs_do_scan(priv, bsstype, curr_chans,
 572                                   to_scan);
 573                 if (ret) {
 574                         lbs_pr_err("SCAN_CMD failed\n");
 575                         goto out2;
 576                 }
 577                 curr_chans += to_scan;
 578                 chan_count -= to_scan;
 579
 580                 /* somehow schedule the next part of the scan */
 581                 if (chan_count && !full_scan &&
 582                     !priv->surpriseremoved) {
 583                         /* -1 marks just that we're currently scanning */
 584                         if (priv->scan_channel < 0)
 585                                 priv->scan_channel = to_scan;
 586                         else
 587                                 priv->scan_channel += to_scan;
 588                         cancel_delayed_work(&priv->scan_work);
 589                         queue_delayed_work(priv->work_thread, &priv->scan_work,
 590                                            msecs_to_jiffies(300));
 591                         /* skip over GIWSCAN event */
 592                         goto out;
 593                 }
 594
 595         }
 596         memset(&wrqu, 0, sizeof(union iwreq_data));
 597         wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
 598
 599 #ifdef CONFIG_LIBERTAS_DEBUG
 600         /* Dump the scan table */
 601         mutex_lock(&priv->lock);
 602         lbs_deb_scan("scan table:\n");
 603         list_for_each_entry(iter, &priv->network_list, list)
 604                 lbs_deb_scan("%02d: BSSID %s, RSSI %d, SSID '%s'\n",
 605                              i++, print_mac(mac, iter->bssid), (int)iter->rssi,
 606                              escape_essid(iter->ssid, iter->ssid_len));
 607         mutex_unlock(&priv->lock);
 608 #endif
 609
 610 out2:
 611         priv->scan_channel = 0;
 612
 613 out:
 614         if (priv->connect_status == LBS_CONNECTED) {
 615                 netif_carrier_on(priv->dev);
 616                 if (!priv->tx_pending_len)
 617                         netif_wake_queue(priv->dev);
 618         }
 619         if (priv->mesh_dev && (priv->mesh_connect_status == LBS_CONNECTED)) {
 620                 netif_carrier_on(priv->mesh_dev);
 621                 if (!priv->tx_pending_len)
 622                         netif_wake_queue(priv->mesh_dev);
 623         }
 624         kfree(chan_list);
 625
 626         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 627         return ret;
 628 }
 629
 630
 631
 632
 633 void lbs_scan_worker(struct work_struct *work)
 634 {
 635         struct lbs_private *priv =
 636                 container_of(work, struct lbs_private, scan_work.work);
 637
 638         lbs_deb_enter(LBS_DEB_SCAN);
 639         lbs_scan_networks(priv, 0);
 640         lbs_deb_leave(LBS_DEB_SCAN);
 641 }
 642
 643
 644 /*********************************************************************/
 645 /*                                                                   */
 646 /*  Result interpretation                                            */
 647 /*                                                                   */
 648 /*********************************************************************/
 649
 650 /**
 651  *  @brief Interpret a BSS scan response returned from the firmware
 652  *
 653  *  Parse the various fixed fields and IEs passed back for a a BSS probe
 654  *  response or beacon from the scan command.  Record information as needed
 655  *  in the scan table struct bss_descriptor for that entry.
 656  *
 657  *  @param bss  Output parameter: Pointer to the BSS Entry
 658  *
 659  *  @return             0 or -1
 660  */
 661 static int lbs_process_bss(struct bss_descriptor *bss,
 662                            uint8_t **pbeaconinfo, int *bytesleft)
 663 {
 664         struct ieeetypes_fhparamset *pFH;
 665         struct ieeetypes_dsparamset *pDS;
 666         struct ieeetypes_cfparamset *pCF;
 667         struct ieeetypes_ibssparamset *pibss;
 668         DECLARE_MAC_BUF(mac);
 669         struct ieeetypes_countryinfoset *pcountryinfo;
 670         uint8_t *pos, *end, *p;
 671         uint8_t n_ex_rates = 0, got_basic_rates = 0, n_basic_rates = 0;
 672         uint16_t beaconsize = 0;
 673         int ret;
 674
 675         lbs_deb_enter(LBS_DEB_SCAN);
 676
 677         if (*bytesleft >= sizeof(beaconsize)) {
 678                 /* Extract & convert beacon size from the command buffer */
 679                 beaconsize = le16_to_cpu(get_unaligned((__le16 *)*pbeaconinfo));
 680                 *bytesleft -= sizeof(beaconsize);
 681                 *pbeaconinfo += sizeof(beaconsize);
 682         }
 683
 684         if (beaconsize == 0 || beaconsize > *bytesleft) {
 685                 *pbeaconinfo += *bytesleft;
 686                 *bytesleft = 0;
 687                 ret = -1;
 688                 goto done;
 689         }
 690
 691         /* Initialize the current working beacon pointer for this BSS iteration */
 692         pos = *pbeaconinfo;
 693         end = pos + beaconsize;
 694
 695         /* Advance the return beacon pointer past the current beacon */
 696         *pbeaconinfo += beaconsize;
 697         *bytesleft -= beaconsize;
 698
 699         memcpy(bss->bssid, pos, ETH_ALEN);
 700         lbs_deb_scan("process_bss: BSSID %s\n", print_mac(mac, bss->bssid));
 701         pos += ETH_ALEN;
 702
 703         if ((end - pos) < 12) {
 704                 lbs_deb_scan("process_bss: Not enough bytes left\n");
 705                 ret = -1;
 706                 goto done;
 707         }
 708
 709         /*
 710          * next 4 fields are RSSI, time stamp, beacon interval,
 711          *   and capability information
 712          */
 713
 714         /* RSSI is 1 byte long */
 715         bss->rssi = *pos;
 716         lbs_deb_scan("process_bss: RSSI %d\n", *pos);
 717         pos++;
 718
 719         /* time stamp is 8 bytes long */
 720         pos += 8;
 721
 722         /* beacon interval is 2 bytes long */
 723         bss->beaconperiod = le16_to_cpup((void *) pos);
 724         pos += 2;
 725
 726         /* capability information is 2 bytes long */
 727         bss->capability = le16_to_cpup((void *) pos);
 728         lbs_deb_scan("process_bss: capabilities 0x%04x\n", bss->capability);
 729         pos += 2;
 730
 731         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 732                 lbs_deb_scan("process_bss: WEP enabled\n");
 733         if (bss->capability & WLAN_CAPABILITY_IBSS)
 734                 bss->mode = IW_MODE_ADHOC;
 735         else
 736                 bss->mode = IW_MODE_INFRA;
 737
 738         /* rest of the current buffer are IE's */
 739         lbs_deb_scan("process_bss: IE len %zd\n", end - pos);
 740         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: IE info", pos, end - pos);
 741
 742         /* process variable IE */
 743         while (pos <= end - 2) {
 744                 struct ieee80211_info_element * elem = (void *)pos;
 745
 746                 if (pos + elem->len > end) {
 747                         lbs_deb_scan("process_bss: error in processing IE, "
 748                                      "bytes left < IE length\n");
 749                         break;
 750                 }
 751
 752                 switch (elem->id) {
 753                 case MFIE_TYPE_SSID:
 754                         bss->ssid_len = elem->len;
 755                         memcpy(bss->ssid, elem->data, elem->len);
 756                         lbs_deb_scan("got SSID IE: '%s', len %u\n",
 757                                      escape_essid(bss->ssid, bss->ssid_len),
 758                                      bss->ssid_len);
 759                         break;
 760
 761                 case MFIE_TYPE_RATES:
 762                         n_basic_rates = min_t(uint8_t, MAX_RATES, elem->len);
 763                         memcpy(bss->rates, elem->data, n_basic_rates);
 764                         got_basic_rates = 1;
 765                         lbs_deb_scan("got RATES IE\n");
 766                         break;
 767
 768                 case MFIE_TYPE_FH_SET:
 769                         pFH = (struct ieeetypes_fhparamset *) pos;
 770                         memmove(&bss->phyparamset.fhparamset, pFH,
 771                                 sizeof(struct ieeetypes_fhparamset));
 772                         lbs_deb_scan("got FH IE\n");
 773                         break;
 774
 775                 case MFIE_TYPE_DS_SET:
 776                         pDS = (struct ieeetypes_dsparamset *) pos;
 777                         bss->channel = pDS->currentchan;
 778                         memcpy(&bss->phyparamset.dsparamset, pDS,
 779                                sizeof(struct ieeetypes_dsparamset));
 780                         lbs_deb_scan("got DS IE, channel %d\n", bss->channel);
 781                         break;
 782
 783                 case MFIE_TYPE_CF_SET:
 784                         pCF = (struct ieeetypes_cfparamset *) pos;
 785                         memcpy(&bss->ssparamset.cfparamset, pCF,
 786                                sizeof(struct ieeetypes_cfparamset));
 787                         lbs_deb_scan("got CF IE\n");
 788                         break;
 789
 790                 case MFIE_TYPE_IBSS_SET:
 791                         pibss = (struct ieeetypes_ibssparamset *) pos;
 792                         bss->atimwindow = le16_to_cpu(pibss->atimwindow);
 793                         memmove(&bss->ssparamset.ibssparamset, pibss,
 794                                 sizeof(struct ieeetypes_ibssparamset));
 795                         lbs_deb_scan("got IBSS IE\n");
 796                         break;
 797
 798                 case MFIE_TYPE_COUNTRY:
 799                         pcountryinfo = (struct ieeetypes_countryinfoset *) pos;
 800                         lbs_deb_scan("got COUNTRY IE\n");
 801                         if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
 802                             || pcountryinfo->len > 254) {
 803                                 lbs_deb_scan("process_bss: 11D- Err CountryInfo len %d, min %zd, max 254\n",
 804                                              pcountryinfo->len, sizeof(pcountryinfo->countrycode));
 805                                 ret = -1;
 806                                 goto done;
 807                         }
 808
 809                         memcpy(&bss->countryinfo, pcountryinfo, pcountryinfo->len + 2);
 810                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: 11d countryinfo",
 811                                     (uint8_t *) pcountryinfo,
 812                                     (int) (pcountryinfo->len + 2));
 813                         break;
 814
 815                 case MFIE_TYPE_RATES_EX:
 816                         /* only process extended supported rate if data rate is
 817                          * already found. Data rate IE should come before
 818                          * extended supported rate IE
 819                          */
 820                         lbs_deb_scan("got RATESEX IE\n");
 821                         if (!got_basic_rates) {
 822                                 lbs_deb_scan("... but ignoring it\n");
 823                                 break;
 824                         }
 825
 826                         n_ex_rates = elem->len;
 827                         if (n_basic_rates + n_ex_rates > MAX_RATES)
 828                                 n_ex_rates = MAX_RATES - n_basic_rates;
 829
 830                         p = bss->rates + n_basic_rates;
 831                         memcpy(p, elem->data, n_ex_rates);
 832                         break;
 833
 834                 case MFIE_TYPE_GENERIC:
 835                         if (elem->len >= 4 &&
 836                             elem->data[0] == 0x00 && elem->data[1] == 0x50 &&
 837                             elem->data[2] == 0xf2 && elem->data[3] == 0x01) {
 838                                 bss->wpa_ie_len = min(elem->len + 2, MAX_WPA_IE_LEN);
 839                                 memcpy(bss->wpa_ie, elem, bss->wpa_ie_len);
 840                                 lbs_deb_scan("got WPA IE\n");
 841                                 lbs_deb_hex(LBS_DEB_SCAN, "WPA IE", bss->wpa_ie, elem->len);
 842                         } else if (elem->len >= MARVELL_MESH_IE_LENGTH &&
 843                                    elem->data[0] == 0x00 && elem->data[1] == 0x50 &&
 844                                    elem->data[2] == 0x43 && elem->data[3] == 0x04) {
 845                                 lbs_deb_scan("got mesh IE\n");
 846                                 bss->mesh = 1;
 847                         } else {
 848                                 lbs_deb_scan("got generic IE: %02x:%02x:%02x:%02x, len %d\n",
 849                                         elem->data[0], elem->data[1],
 850                                         elem->data[2], elem->data[3],
 851                                         elem->len);
 852                         }
 853                         break;
 854
 855                 case MFIE_TYPE_RSN:
 856                         lbs_deb_scan("got RSN IE\n");
 857                         bss->rsn_ie_len = min(elem->len + 2, MAX_WPA_IE_LEN);
 858                         memcpy(bss->rsn_ie, elem, bss->rsn_ie_len);
 859                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: RSN_IE",
 860                                     bss->rsn_ie, elem->len);
 861                         break;
 862
 863                 default:
 864                         lbs_deb_scan("got IE 0x%04x, len %d\n",
 865                                      elem->id, elem->len);
 866                         break;
 867                 }
 868
 869                 pos += elem->len + 2;
 870         }
 871
 872         /* Timestamp */
 873         bss->last_scanned = jiffies;
 874         lbs_unset_basic_rate_flags(bss->rates, sizeof(bss->rates));
 875
 876         ret = 0;
 877
 878 done:
 879         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 880         return ret;
 881 }
 882
 883 /**
 884  *  @brief This function finds a specific compatible BSSID in the scan list
 885  *
 886  *  Used in association code
 887  *
 888  *  @param priv  A pointer to struct lbs_private
 889  *  @param bssid    BSSID to find in the scan list
 890  *  @param mode     Network mode: Infrastructure or IBSS
 891  *
 892  *  @return         index in BSSID list, or error return code (< 0)
 893  */
 894 struct bss_descriptor *lbs_find_bssid_in_list(struct lbs_private *priv,
 895                                               uint8_t *bssid, uint8_t mode)
 896 {
 897         struct bss_descriptor *iter_bss;
 898         struct bss_descriptor *found_bss = NULL;
 899
 900         lbs_deb_enter(LBS_DEB_SCAN);
 901
 902         if (!bssid)
 903                 goto out;
 904
 905         lbs_deb_hex(LBS_DEB_SCAN, "looking for", bssid, ETH_ALEN);
 906
 907         /* Look through the scan table for a compatible match.  The loop will
 908          *   continue past a matched bssid that is not compatible in case there
 909          *   is an AP with multiple SSIDs assigned to the same BSSID
 910          */
 911         mutex_lock(&priv->lock);
 912         list_for_each_entry (iter_bss, &priv->network_list, list) {
 913                 if (compare_ether_addr(iter_bss->bssid, bssid))
 914                         continue; /* bssid doesn't match */
 915                 switch (mode) {
 916                 case IW_MODE_INFRA:
 917                 case IW_MODE_ADHOC:
 918                         if (!is_network_compatible(priv, iter_bss, mode))
 919                                 break;
 920                         found_bss = iter_bss;
 921                         break;
 922                 default:
 923                         found_bss = iter_bss;
 924                         break;
 925                 }
 926         }
 927         mutex_unlock(&priv->lock);
 928
 929 out:
 930         lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss);
 931         return found_bss;
 932 }
 933
 934 /**
 935  *  @brief This function finds ssid in ssid list.
 936  *
 937  *  Used in association code
 938  *
 939  *  @param priv  A pointer to struct lbs_private
 940  *  @param ssid     SSID to find in the list
 941  *  @param bssid    BSSID to qualify the SSID selection (if provided)
 942  *  @param mode     Network mode: Infrastructure or IBSS
 943  *
 944  *  @return         index in BSSID list
 945  */
 946 struct bss_descriptor *lbs_find_ssid_in_list(struct lbs_private *priv,
 947                                              uint8_t *ssid, uint8_t ssid_len,
 948                                              uint8_t *bssid, uint8_t mode,
 949                                              int channel)
 950 {
 951         uint8_t bestrssi = 0;
 952         struct bss_descriptor * iter_bss = NULL;
 953         struct bss_descriptor * found_bss = NULL;
 954         struct bss_descriptor * tmp_oldest = NULL;
 955
 956         lbs_deb_enter(LBS_DEB_SCAN);
 957
 958         mutex_lock(&priv->lock);
 959
 960         list_for_each_entry (iter_bss, &priv->network_list, list) {
 961                 if (   !tmp_oldest
 962                     || (iter_bss->last_scanned < tmp_oldest->last_scanned))
 963                         tmp_oldest = iter_bss;
 964
 965                 if (lbs_ssid_cmp(iter_bss->ssid, iter_bss->ssid_len,
 966                                  ssid, ssid_len) != 0)
 967                         continue; /* ssid doesn't match */
 968                 if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
 969                         continue; /* bssid doesn't match */
 970                 if ((channel > 0) && (iter_bss->channel != channel))
 971                         continue; /* channel doesn't match */
 972
 973                 switch (mode) {
 974                 case IW_MODE_INFRA:
 975                 case IW_MODE_ADHOC:
 976                         if (!is_network_compatible(priv, iter_bss, mode))
 977                                 break;
 978
 979                         if (bssid) {
 980                                 /* Found requested BSSID */
 981                                 found_bss = iter_bss;
 982                                 goto out;
 983                         }
 984
 985                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
 986                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
 987                                 found_bss = iter_bss;
 988                         }
 989                         break;
 990                 case IW_MODE_AUTO:
 991                 default:
 992                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
 993                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
 994                                 found_bss = iter_bss;
 995                         }
 996                         break;
 997                 }
 998         }
 999
1000 out:
1001         mutex_unlock(&priv->lock);
1002         lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss);
1003         return found_bss;
1004 }
1005
1006 /**
1007  *  @brief This function finds the best SSID in the Scan List
1008  *
1009  *  Search the scan table for the best SSID that also matches the current
1010  *   adapter network preference (infrastructure or adhoc)
1011  *
1012  *  @param priv  A pointer to struct lbs_private
1013  *
1014  *  @return         index in BSSID list
1015  */
1016 static struct bss_descriptor *lbs_find_best_ssid_in_list(struct lbs_private *priv,
1017                                                          uint8_t mode)
1018 {
1019         uint8_t bestrssi = 0;
1020         struct bss_descriptor *iter_bss;
1021         struct bss_descriptor *best_bss = NULL;
1022
1023         lbs_deb_enter(LBS_DEB_SCAN);
1024
1025         mutex_lock(&priv->lock);
1026
1027         list_for_each_entry (iter_bss, &priv->network_list, list) {
1028                 switch (mode) {
1029                 case IW_MODE_INFRA:
1030                 case IW_MODE_ADHOC:
1031                         if (!is_network_compatible(priv, iter_bss, mode))
1032                                 break;
1033                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1034                                 break;
1035                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1036                         best_bss = iter_bss;
1037                         break;
1038                 case IW_MODE_AUTO:
1039                 default:
1040                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1041                                 break;
1042                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1043                         best_bss = iter_bss;
1044                         break;
1045                 }
1046         }
1047
1048         mutex_unlock(&priv->lock);
1049         lbs_deb_leave_args(LBS_DEB_SCAN, "best_bss %p", best_bss);
1050         return best_bss;
1051 }
1052
1053 /**
1054  *  @brief Find the best AP
1055  *
1056  *  Used from association worker.
1057  *
1058  *  @param priv         A pointer to struct lbs_private structure
1059  *  @param pSSID        A pointer to AP's ssid
1060  *
1061  *  @return             0--success, otherwise--fail
1062  */
1063 int lbs_find_best_network_ssid(struct lbs_private *priv, uint8_t *out_ssid,
1064                                uint8_t *out_ssid_len, uint8_t preferred_mode,
1065                                uint8_t *out_mode)
1066 {
1067         int ret = -1;
1068         struct bss_descriptor *found;
1069
1070         lbs_deb_enter(LBS_DEB_SCAN);
1071
1072         priv->scan_ssid_len = 0;
1073         lbs_scan_networks(priv, 1);
1074         if (priv->surpriseremoved)
1075                 goto out;
1076
1077         found = lbs_find_best_ssid_in_list(priv, preferred_mode);
1078         if (found && (found->ssid_len > 0)) {
1079                 memcpy(out_ssid, &found->ssid, IW_ESSID_MAX_SIZE);
1080                 *out_ssid_len = found->ssid_len;
1081                 *out_mode = found->mode;
1082                 ret = 0;
1083         }
1084
1085 out:
1086         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1087         return ret;
1088 }
1089
1090
1091 /**
1092  *  @brief Send a scan command for all available channels filtered on a spec
1093  *
1094  *  Used in association code and from debugfs
1095  *
1096  *  @param priv             A pointer to struct lbs_private structure
1097  *  @param ssid             A pointer to the SSID to scan for
1098  *  @param ssid_len         Length of the SSID
1099  *
1100  *  @return                0-success, otherwise fail
1101  */
1102 int lbs_send_specific_ssid_scan(struct lbs_private *priv, uint8_t *ssid,
1103                                 uint8_t ssid_len)
1104 {
1105         int ret = 0;
1106
1107         lbs_deb_enter_args(LBS_DEB_SCAN, "SSID '%s'\n",
1108                            escape_essid(ssid, ssid_len));
1109
1110         if (!ssid_len)
1111                 goto out;
1112
1113         memcpy(priv->scan_ssid, ssid, ssid_len);
1114         priv->scan_ssid_len = ssid_len;
1115
1116         lbs_scan_networks(priv, 1);
1117         if (priv->surpriseremoved) {
1118                 ret = -1;
1119                 goto out;
1120         }
1121
1122 out:
1123         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1124         return ret;
1125 }
1126
1127
1128
1129
1130 /*********************************************************************/
1131 /*                                                                   */
1132 /*  Support for Wireless Extensions                                  */
1133 /*                                                                   */
1134 /*********************************************************************/
1135
1136
1137 #define MAX_CUSTOM_LEN 64
1138
1139 static inline char *lbs_translate_scan(struct lbs_private *priv,
1140                                        char *start, char *stop,
1141                                        struct bss_descriptor *bss)
1142 {
1143         struct chan_freq_power *cfp;
1144         char *current_val;      /* For rates */
1145         struct iw_event iwe;    /* Temporary buffer */
1146         int j;
1147 #define PERFECT_RSSI ((uint8_t)50)
1148 #define WORST_RSSI   ((uint8_t)0)
1149 #define RSSI_DIFF    ((uint8_t)(PERFECT_RSSI - WORST_RSSI))
1150         uint8_t rssi;
1151
1152         lbs_deb_enter(LBS_DEB_SCAN);
1153
1154         cfp = lbs_find_cfp_by_band_and_channel(priv, 0, bss->channel);
1155         if (!cfp) {
1156                 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1157                 start = NULL;
1158                 goto out;
1159         }
1160
1161         /* First entry *MUST* be the BSSID */
1162         iwe.cmd = SIOCGIWAP;
1163         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1164         memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1165         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1166
1167         /* SSID */
1168         iwe.cmd = SIOCGIWESSID;
1169         iwe.u.data.flags = 1;
1170         iwe.u.data.length = min((uint32_t) bss->ssid_len, (uint32_t) IW_ESSID_MAX_SIZE);
1171         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1172
1173         /* Mode */
1174         iwe.cmd = SIOCGIWMODE;
1175         iwe.u.mode = bss->mode;
1176         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1177
1178         /* Frequency */
1179         iwe.cmd = SIOCGIWFREQ;
1180         iwe.u.freq.m = (long)cfp->freq * 100000;
1181         iwe.u.freq.e = 1;
1182         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1183
1184         /* Add quality statistics */
1185         iwe.cmd = IWEVQUAL;
1186         iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1187         iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1188
1189         rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1190         iwe.u.qual.qual =
1191                 (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1192                  (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1193                 (RSSI_DIFF * RSSI_DIFF);
1194         if (iwe.u.qual.qual > 100)
1195                 iwe.u.qual.qual = 100;
1196
1197         if (priv->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1198                 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1199         } else {
1200                 iwe.u.qual.noise = CAL_NF(priv->NF[TYPE_BEACON][TYPE_NOAVG]);
1201         }
1202
1203         /* Locally created ad-hoc BSSs won't have beacons if this is the
1204          * only station in the adhoc network; so get signal strength
1205          * from receive statistics.
1206          */
1207         if ((priv->mode == IW_MODE_ADHOC) && priv->adhoccreate
1208             && !lbs_ssid_cmp(priv->curbssparams.ssid,
1209                              priv->curbssparams.ssid_len,
1210                              bss->ssid, bss->ssid_len)) {
1211                 int snr, nf;
1212                 snr = priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1213                 nf = priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1214                 iwe.u.qual.level = CAL_RSSI(snr, nf);
1215         }
1216         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
1217
1218         /* Add encryption capability */
1219         iwe.cmd = SIOCGIWENCODE;
1220         if (bss->capability & WLAN_CAPABILITY_PRIVACY) {
1221                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1222         } else {
1223                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1224         }
1225         iwe.u.data.length = 0;
1226         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1227
1228         current_val = start + IW_EV_LCP_LEN;
1229
1230         iwe.cmd = SIOCGIWRATE;
1231         iwe.u.bitrate.fixed = 0;
1232         iwe.u.bitrate.disabled = 0;
1233         iwe.u.bitrate.value = 0;
1234
1235         for (j = 0; bss->rates[j] && (j < sizeof(bss->rates)); j++) {
1236                 /* Bit rate given in 500 kb/s units */
1237                 iwe.u.bitrate.value = bss->rates[j] * 500000;
1238                 current_val = iwe_stream_add_value(start, current_val,
1239                                          stop, &iwe, IW_EV_PARAM_LEN);
1240         }
1241         if ((bss->mode == IW_MODE_ADHOC) && priv->adhoccreate
1242             && !lbs_ssid_cmp(priv->curbssparams.ssid,
1243                              priv->curbssparams.ssid_len,
1244                              bss->ssid, bss->ssid_len)) {
1245                 iwe.u.bitrate.value = 22 * 500000;
1246                 current_val = iwe_stream_add_value(start, current_val,
1247                                                    stop, &iwe, IW_EV_PARAM_LEN);
1248         }
1249         /* Check if we added any event */
1250         if((current_val - start) > IW_EV_LCP_LEN)
1251                 start = current_val;
1252
1253         memset(&iwe, 0, sizeof(iwe));
1254         if (bss->wpa_ie_len) {
1255                 char buf[MAX_WPA_IE_LEN];
1256                 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1257                 iwe.cmd = IWEVGENIE;
1258                 iwe.u.data.length = bss->wpa_ie_len;
1259                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1260         }
1261
1262         memset(&iwe, 0, sizeof(iwe));
1263         if (bss->rsn_ie_len) {
1264                 char buf[MAX_WPA_IE_LEN];
1265                 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1266                 iwe.cmd = IWEVGENIE;
1267                 iwe.u.data.length = bss->rsn_ie_len;
1268                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1269         }
1270
1271         if (bss->mesh) {
1272                 char custom[MAX_CUSTOM_LEN];
1273                 char *p = custom;
1274
1275                 iwe.cmd = IWEVCUSTOM;
1276                 p += snprintf(p, MAX_CUSTOM_LEN, "mesh-type: olpc");
1277                 iwe.u.data.length = p - custom;
1278                 if (iwe.u.data.length)
1279                         start = iwe_stream_add_point(start, stop, &iwe, custom);
1280         }
1281
1282 out:
1283         lbs_deb_leave_args(LBS_DEB_SCAN, "start %p", start);
1284         return start;
1285 }
1286
1287
1288 /**
1289  *  @brief Handle Scan Network ioctl
1290  *
1291  *  @param dev          A pointer to net_device structure
1292  *  @param info         A pointer to iw_request_info structure
1293  *  @param vwrq         A pointer to iw_param structure
1294  *  @param extra        A pointer to extra data buf
1295  *
1296  *  @return             0 --success, otherwise fail
1297  */
1298 int lbs_set_scan(struct net_device *dev, struct iw_request_info *info,
1299                  union iwreq_data *wrqu, char *extra)
1300 {
1301         struct lbs_private *priv = dev->priv;
1302         int ret = 0;
1303
1304         lbs_deb_enter(LBS_DEB_WEXT);
1305
1306         if (!netif_running(dev)) {
1307                 ret = -ENETDOWN;
1308                 goto out;
1309         }
1310
1311         /* mac80211 does this:
1312         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1313         if (sdata->type != IEEE80211_IF_TYPE_xxx) {
1314                 ret = -EOPNOTSUPP;
1315                 goto out;
1316         }
1317         */
1318
1319         if (wrqu->data.length == sizeof(struct iw_scan_req) &&
1320             wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1321                 struct iw_scan_req *req = (struct iw_scan_req *)extra;
1322                 priv->scan_ssid_len = req->essid_len;
1323                 memcpy(priv->scan_ssid, req->essid, priv->scan_ssid_len);
1324                 lbs_deb_wext("set_scan, essid '%s'\n",
1325                         escape_essid(priv->scan_ssid, priv->scan_ssid_len));
1326         } else {
1327                 priv->scan_ssid_len = 0;
1328         }
1329
1330         if (!delayed_work_pending(&priv->scan_work))
1331                 queue_delayed_work(priv->work_thread, &priv->scan_work,
1332                                    msecs_to_jiffies(50));
1333         /* set marker that currently a scan is taking place */
1334         priv->scan_channel = -1;
1335
1336         if (priv->surpriseremoved)
1337                 ret = -EIO;
1338
1339 out:
1340         lbs_deb_leave_args(LBS_DEB_WEXT, "ret %d", ret);
1341         return ret;
1342 }
1343
1344
1345 /**
1346  *  @brief  Handle Retrieve scan table ioctl
1347  *
1348  *  @param dev          A pointer to net_device structure
1349  *  @param info         A pointer to iw_request_info structure
1350  *  @param dwrq         A pointer to iw_point structure
1351  *  @param extra        A pointer to extra data buf
1352  *
1353  *  @return             0 --success, otherwise fail
1354  */
1355 int lbs_get_scan(struct net_device *dev, struct iw_request_info *info,
1356                  struct iw_point *dwrq, char *extra)
1357 {
1358 #define SCAN_ITEM_SIZE 128
1359         struct lbs_private *priv = dev->priv;
1360         int err = 0;
1361         char *ev = extra;
1362         char *stop = ev + dwrq->length;
1363         struct bss_descriptor *iter_bss;
1364         struct bss_descriptor *safe;
1365
1366         lbs_deb_enter(LBS_DEB_WEXT);
1367
1368         /* iwlist should wait until the current scan is finished */
1369         if (priv->scan_channel)
1370                 return -EAGAIN;
1371
1372         /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1373         if ((priv->mode == IW_MODE_ADHOC) && priv->adhoccreate)
1374                 lbs_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
1375                                              CMD_OPTION_WAITFORRSP, 0, NULL);
1376
1377         mutex_lock(&priv->lock);
1378         list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) {
1379                 char *next_ev;
1380                 unsigned long stale_time;
1381
1382                 if (stop - ev < SCAN_ITEM_SIZE) {
1383                         err = -E2BIG;
1384                         break;
1385                 }
1386
1387                 /* For mesh device, list only mesh networks */
1388                 if (dev == priv->mesh_dev && !iter_bss->mesh)
1389                         continue;
1390
1391                 /* Prune old an old scan result */
1392                 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1393                 if (time_after(jiffies, stale_time)) {
1394                         list_move_tail(&iter_bss->list, &priv->network_free_list);
1395                         clear_bss_descriptor(iter_bss);
1396                         continue;
1397                 }
1398
1399                 /* Translate to WE format this entry */
1400                 next_ev = lbs_translate_scan(priv, ev, stop, iter_bss);
1401                 if (next_ev == NULL)
1402                         continue;
1403                 ev = next_ev;
1404         }
1405         mutex_unlock(&priv->lock);
1406
1407         dwrq->length = (ev - extra);
1408         dwrq->flags = 0;
1409
1410         lbs_deb_leave_args(LBS_DEB_WEXT, "ret %d", err);
1411         return err;
1412 }
1413
1414
1415
1416
1417 /*********************************************************************/
1418 /*                                                                   */
1419 /*  Command execution                                                */
1420 /*                                                                   */
1421 /*********************************************************************/
1422
1423
1424 /**
1425  *  @brief This function handles the command response of scan
1426  *
1427  *  Called from handle_cmd_response() in cmdrespc.
1428  *
1429  *   The response buffer for the scan command has the following
1430  *      memory layout:
1431  *
1432  *     .-----------------------------------------------------------.
1433  *     |  header (4 * sizeof(u16)):  Standard command response hdr |
1434  *     .-----------------------------------------------------------.
1435  *     |  bufsize (u16) : sizeof the BSS Description data          |
1436  *     .-----------------------------------------------------------.
1437  *     |  NumOfSet (u8) : Number of BSS Descs returned             |
1438  *     .-----------------------------------------------------------.
1439  *     |  BSSDescription data (variable, size given in bufsize)    |
1440  *     .-----------------------------------------------------------.
1441  *     |  TLV data (variable, size calculated using header->size,  |
1442  *     |            bufsize and sizeof the fixed fields above)     |
1443  *     .-----------------------------------------------------------.
1444  *
1445  *  @param priv    A pointer to struct lbs_private structure
1446  *  @param resp    A pointer to cmd_ds_command
1447  *
1448  *  @return        0 or -1
1449  */
1450 static int lbs_ret_80211_scan(struct lbs_private *priv, unsigned long dummy,
1451                               struct cmd_header *resp)
1452 {
1453         struct cmd_ds_802_11_scan_rsp *scanresp = (void *)resp;
1454         struct bss_descriptor *iter_bss;
1455         struct bss_descriptor *safe;
1456         uint8_t *bssinfo;
1457         uint16_t scanrespsize;
1458         int bytesleft;
1459         int idx;
1460         int tlvbufsize;
1461         int ret;
1462
1463         lbs_deb_enter(LBS_DEB_SCAN);
1464
1465         /* Prune old entries from scan table */
1466         list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) {
1467                 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1468                 if (time_before(jiffies, stale_time))
1469                         continue;
1470                 list_move_tail (&iter_bss->list, &priv->network_free_list);
1471                 clear_bss_descriptor(iter_bss);
1472         }
1473
1474         if (scanresp->nr_sets > MAX_NETWORK_COUNT) {
1475                 lbs_deb_scan("SCAN_RESP: too many scan results (%d, max %d)\n",
1476                              scanresp->nr_sets, MAX_NETWORK_COUNT);
1477                 ret = -1;
1478                 goto done;
1479         }
1480
1481         bytesleft = le16_to_cpu(scanresp->bssdescriptsize);
1482         lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1483
1484         scanrespsize = le16_to_cpu(resp->size);
1485         lbs_deb_scan("SCAN_RESP: scan results %d\n", scanresp->nr_sets);
1486
1487         bssinfo = scanresp->bssdesc_and_tlvbuffer;
1488
1489         /* The size of the TLV buffer is equal to the entire command response
1490          *   size (scanrespsize) minus the fixed fields (sizeof()'s), the
1491          *   BSS Descriptions (bssdescriptsize as bytesLef) and the command
1492          *   response header (S_DS_GEN)
1493          */
1494         tlvbufsize = scanrespsize - (bytesleft + sizeof(scanresp->bssdescriptsize)
1495                                      + sizeof(scanresp->nr_sets)
1496                                      + S_DS_GEN);
1497
1498         /*
1499          *  Process each scan response returned (scanresp->nr_sets). Save
1500          *    the information in the newbssentry and then insert into the
1501          *    driver scan table either as an update to an existing entry
1502          *    or as an addition at the end of the table
1503          */
1504         for (idx = 0; idx < scanresp->nr_sets && bytesleft; idx++) {
1505                 struct bss_descriptor new;
1506                 struct bss_descriptor *found = NULL;
1507                 struct bss_descriptor *oldest = NULL;
1508                 DECLARE_MAC_BUF(mac);
1509
1510                 /* Process the data fields and IEs returned for this BSS */
1511                 memset(&new, 0, sizeof (struct bss_descriptor));
1512                 if (lbs_process_bss(&new, &bssinfo, &bytesleft) != 0) {
1513                         /* error parsing the scan response, skipped */
1514                         lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1515                         continue;
1516                 }
1517
1518                 /* Try to find this bss in the scan table */
1519                 list_for_each_entry (iter_bss, &priv->network_list, list) {
1520                         if (is_same_network(iter_bss, &new)) {
1521                                 found = iter_bss;
1522                                 break;
1523                         }
1524
1525                         if ((oldest == NULL) ||
1526                             (iter_bss->last_scanned < oldest->last_scanned))
1527                                 oldest = iter_bss;
1528                 }
1529
1530                 if (found) {
1531                         /* found, clear it */
1532                         clear_bss_descriptor(found);
1533                 } else if (!list_empty(&priv->network_free_list)) {
1534                         /* Pull one from the free list */
1535                         found = list_entry(priv->network_free_list.next,
1536                                            struct bss_descriptor, list);
1537                         list_move_tail(&found->list, &priv->network_list);
1538                 } else if (oldest) {
1539                         /* If there are no more slots, expire the oldest */
1540                         found = oldest;
1541                         clear_bss_descriptor(found);
1542                         list_move_tail(&found->list, &priv->network_list);
1543                 } else {
1544                         continue;
1545                 }
1546
1547                 lbs_deb_scan("SCAN_RESP: BSSID %s\n", print_mac(mac, new.bssid));
1548
1549                 /* Copy the locally created newbssentry to the scan table */
1550                 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1551         }
1552
1553         ret = 0;
1554
1555 done:
1556         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1557         return ret;
1558 }