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
  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                             + CHAN_TLV_MAX_SIZE                 \
  45                             + 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 const u8 zeromac[ETH_ALEN] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
  65 static const u8 bcastmac[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  66
  67
  68
  69
  70 /*********************************************************************/
  71 /*                                                                   */
  72 /*  Misc helper functions                                            */
  73 /*                                                                   */
  74 /*********************************************************************/
  75
  76 static inline void clear_bss_descriptor (struct bss_descriptor * bss)
  77 {
  78         /* Don't blow away ->list, just BSS data */
  79         memset(bss, 0, offsetof(struct bss_descriptor, list));
  80 }
  81
  82 /**
  83  *  @brief Compare two SSIDs
  84  *
  85  *  @param ssid1    A pointer to ssid to compare
  86  *  @param ssid2    A pointer to ssid to compare
  87  *
  88  *  @return         0: ssid is same, otherwise is different
  89  */
  90 int lbs_ssid_cmp(u8 *ssid1, u8 ssid1_len, u8 *ssid2, u8 ssid2_len)
  91 {
  92         if (ssid1_len != ssid2_len)
  93                 return -1;
  94
  95         return memcmp(ssid1, ssid2, ssid1_len);
  96 }
  97
  98 static inline int match_bss_no_security(struct lbs_802_11_security *secinfo,
  99                         struct bss_descriptor * match_bss)
 100 {
 101         if (   !secinfo->wep_enabled
 102             && !secinfo->WPAenabled
 103             && !secinfo->WPA2enabled
 104             && match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC
 105             && match_bss->rsn_ie[0] != MFIE_TYPE_RSN
 106             && !(match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 107                 return 1;
 108         }
 109         return 0;
 110 }
 111
 112 static inline int match_bss_static_wep(struct lbs_802_11_security *secinfo,
 113                         struct bss_descriptor * match_bss)
 114 {
 115         if ( secinfo->wep_enabled
 116            && !secinfo->WPAenabled
 117            && !secinfo->WPA2enabled
 118            && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 119                 return 1;
 120         }
 121         return 0;
 122 }
 123
 124 static inline int match_bss_wpa(struct lbs_802_11_security *secinfo,
 125                         struct bss_descriptor * match_bss)
 126 {
 127         if (  !secinfo->wep_enabled
 128            && secinfo->WPAenabled
 129            && (match_bss->wpa_ie[0] == MFIE_TYPE_GENERIC)
 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_wpa2(struct lbs_802_11_security *secinfo,
 140                         struct bss_descriptor * match_bss)
 141 {
 142         if (  !secinfo->wep_enabled
 143            && secinfo->WPA2enabled
 144            && (match_bss->rsn_ie[0] == MFIE_TYPE_RSN)
 145            /* privacy bit may NOT be set in some APs like LinkSys WRT54G
 146               && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 147             */
 148            ) {
 149                 return 1;
 150         }
 151         return 0;
 152 }
 153
 154 static inline int match_bss_dynamic_wep(struct lbs_802_11_security *secinfo,
 155                         struct bss_descriptor * match_bss)
 156 {
 157         if (  !secinfo->wep_enabled
 158            && !secinfo->WPAenabled
 159            && !secinfo->WPA2enabled
 160            && (match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC)
 161            && (match_bss->rsn_ie[0] != MFIE_TYPE_RSN)
 162            && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
 163                 return 1;
 164         }
 165         return 0;
 166 }
 167
 168 static inline int is_same_network(struct bss_descriptor *src,
 169                                   struct bss_descriptor *dst)
 170 {
 171         /* A network is only a duplicate if the channel, BSSID, and ESSID
 172          * all match.  We treat all <hidden> with the same BSSID and channel
 173          * as one network */
 174         return ((src->ssid_len == dst->ssid_len) &&
 175                 (src->channel == dst->channel) &&
 176                 !compare_ether_addr(src->bssid, dst->bssid) &&
 177                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
 178 }
 179
 180 /**
 181  *  @brief Check if a scanned network compatible with the driver settings
 182  *
 183  *   WEP     WPA     WPA2    ad-hoc  encrypt                      Network
 184  * enabled enabled  enabled   AES     mode   privacy  WPA  WPA2  Compatible
 185  *    0       0        0       0      NONE      0      0    0   yes No security
 186  *    1       0        0       0      NONE      1      0    0   yes Static WEP
 187  *    0       1        0       0       x        1x     1    x   yes WPA
 188  *    0       0        1       0       x        1x     x    1   yes WPA2
 189  *    0       0        0       1      NONE      1      0    0   yes Ad-hoc AES
 190  *    0       0        0       0     !=NONE     1      0    0   yes Dynamic WEP
 191  *
 192  *
 193  *  @param priv A pointer to struct lbs_private
 194  *  @param index   Index in scantable to check against current driver settings
 195  *  @param mode    Network mode: Infrastructure or IBSS
 196  *
 197  *  @return        Index in scantable, or error code if negative
 198  */
 199 static int is_network_compatible(struct lbs_private *priv,
 200                 struct bss_descriptor * bss, u8 mode)
 201 {
 202         int matched = 0;
 203
 204         lbs_deb_enter(LBS_DEB_SCAN);
 205
 206         if (bss->mode != mode)
 207                 goto done;
 208
 209         if ((matched = match_bss_no_security(&priv->secinfo, bss))) {
 210                 goto done;
 211         } else if ((matched = match_bss_static_wep(&priv->secinfo, bss))) {
 212                 goto done;
 213         } else if ((matched = match_bss_wpa(&priv->secinfo, bss))) {
 214                 lbs_deb_scan(
 215                        "is_network_compatible() WPA: wpa_ie 0x%x "
 216                        "wpa2_ie 0x%x WEP %s WPA %s WPA2 %s "
 217                        "privacy 0x%x\n", bss->wpa_ie[0], bss->rsn_ie[0],
 218                        priv->secinfo.wep_enabled ? "e" : "d",
 219                        priv->secinfo.WPAenabled ? "e" : "d",
 220                        priv->secinfo.WPA2enabled ? "e" : "d",
 221                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
 222                 goto done;
 223         } else if ((matched = match_bss_wpa2(&priv->secinfo, bss))) {
 224                 lbs_deb_scan(
 225                        "is_network_compatible() WPA2: wpa_ie 0x%x "
 226                        "wpa2_ie 0x%x WEP %s WPA %s WPA2 %s "
 227                        "privacy 0x%x\n", bss->wpa_ie[0], bss->rsn_ie[0],
 228                        priv->secinfo.wep_enabled ? "e" : "d",
 229                        priv->secinfo.WPAenabled ? "e" : "d",
 230                        priv->secinfo.WPA2enabled ? "e" : "d",
 231                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
 232                 goto done;
 233         } else if ((matched = match_bss_dynamic_wep(&priv->secinfo, bss))) {
 234                 lbs_deb_scan(
 235                        "is_network_compatible() dynamic WEP: "
 236                        "wpa_ie 0x%x wpa2_ie 0x%x privacy 0x%x\n",
 237                        bss->wpa_ie[0], bss->rsn_ie[0],
 238                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
 239                 goto done;
 240         }
 241
 242         /* bss security settings don't match those configured on card */
 243         lbs_deb_scan(
 244                "is_network_compatible() FAILED: wpa_ie 0x%x "
 245                "wpa2_ie 0x%x WEP %s WPA %s WPA2 %s privacy 0x%x\n",
 246                bss->wpa_ie[0], bss->rsn_ie[0],
 247                priv->secinfo.wep_enabled ? "e" : "d",
 248                priv->secinfo.WPAenabled ? "e" : "d",
 249                priv->secinfo.WPA2enabled ? "e" : "d",
 250                (bss->capability & WLAN_CAPABILITY_PRIVACY));
 251
 252 done:
 253         lbs_deb_leave_args(LBS_DEB_SCAN, "matched: %d", matched);
 254         return matched;
 255 }
 256
 257
 258
 259
 260 /*********************************************************************/
 261 /*                                                                   */
 262 /*  Main scanning support                                            */
 263 /*                                                                   */
 264 /*********************************************************************/
 265
 266 void lbs_scan_worker(struct work_struct *work)
 267 {
 268         struct lbs_private *priv =
 269                 container_of(work, struct lbs_private, scan_work.work);
 270
 271         lbs_deb_enter(LBS_DEB_SCAN);
 272         lbs_scan_networks(priv, NULL, 0);
 273         lbs_deb_leave(LBS_DEB_SCAN);
 274 }
 275
 276
 277 /**
 278  *  @brief Create a channel list for the driver to scan based on region info
 279  *
 280  *  Only used from lbs_scan_setup_scan_config()
 281  *
 282  *  Use the driver region/band information to construct a comprehensive list
 283  *    of channels to scan.  This routine is used for any scan that is not
 284  *    provided a specific channel list to scan.
 285  *
 286  *  @param priv          A pointer to struct lbs_private structure
 287  *  @param scanchanlist  Output parameter: resulting channel list to scan
 288  *  @param filteredscan  Flag indicating whether or not a BSSID or SSID filter
 289  *                       is being sent in the command to firmware.  Used to
 290  *                       increase the number of channels sent in a scan
 291  *                       command and to disable the firmware channel scan
 292  *                       filter.
 293  *
 294  *  @return              void
 295  */
 296 static int lbs_scan_create_channel_list(struct lbs_private *priv,
 297                                           struct chanscanparamset * scanchanlist,
 298                                           u8 filteredscan)
 299 {
 300
 301         struct region_channel *scanregion;
 302         struct chan_freq_power *cfp;
 303         int rgnidx;
 304         int chanidx;
 305         int nextchan;
 306         u8 scantype;
 307
 308         chanidx = 0;
 309
 310         /* Set the default scan type to the user specified type, will later
 311          *   be changed to passive on a per channel basis if restricted by
 312          *   regulatory requirements (11d or 11h)
 313          */
 314         scantype = CMD_SCAN_TYPE_ACTIVE;
 315
 316         for (rgnidx = 0; rgnidx < ARRAY_SIZE(priv->region_channel); rgnidx++) {
 317                 if (priv->enable11d &&
 318                     (priv->connect_status != LBS_CONNECTED) &&
 319                     (priv->mesh_connect_status != LBS_CONNECTED)) {
 320                         /* Scan all the supported chan for the first scan */
 321                         if (!priv->universal_channel[rgnidx].valid)
 322                                 continue;
 323                         scanregion = &priv->universal_channel[rgnidx];
 324
 325                         /* clear the parsed_region_chan for the first scan */
 326                         memset(&priv->parsed_region_chan, 0x00,
 327                                sizeof(priv->parsed_region_chan));
 328                 } else {
 329                         if (!priv->region_channel[rgnidx].valid)
 330                                 continue;
 331                         scanregion = &priv->region_channel[rgnidx];
 332                 }
 333
 334                 for (nextchan = 0;
 335                      nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
 336
 337                         cfp = scanregion->CFP + nextchan;
 338
 339                         if (priv->enable11d) {
 340                                 scantype =
 341                                     lbs_get_scan_type_11d(cfp->channel,
 342                                                            &priv->
 343                                                            parsed_region_chan);
 344                         }
 345
 346                         switch (scanregion->band) {
 347                         case BAND_B:
 348                         case BAND_G:
 349                         default:
 350                                 scanchanlist[chanidx].radiotype =
 351                                     CMD_SCAN_RADIO_TYPE_BG;
 352                                 break;
 353                         }
 354
 355                         if (scantype == CMD_SCAN_TYPE_PASSIVE) {
 356                                 scanchanlist[chanidx].maxscantime =
 357                                     cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
 358                                 scanchanlist[chanidx].chanscanmode.passivescan =
 359                                     1;
 360                         } else {
 361                                 scanchanlist[chanidx].maxscantime =
 362                                     cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
 363                                 scanchanlist[chanidx].chanscanmode.passivescan =
 364                                     0;
 365                         }
 366
 367                         scanchanlist[chanidx].channumber = cfp->channel;
 368
 369                         if (filteredscan) {
 370                                 scanchanlist[chanidx].chanscanmode.
 371                                     disablechanfilt = 1;
 372                         }
 373                 }
 374         }
 375         return chanidx;
 376 }
 377
 378
 379 /*
 380  * Add SSID TLV of the form:
 381  *
 382  * TLV-ID SSID     00 00
 383  * length          06 00
 384  * ssid            4d 4e 54 45 53 54
 385  */
 386 static int lbs_scan_add_ssid_tlv(u8 *tlv,
 387         const struct lbs_ioctl_user_scan_cfg *user_cfg)
 388 {
 389         struct mrvlietypes_ssidparamset *ssid_tlv =
 390                 (struct mrvlietypes_ssidparamset *)tlv;
 391         ssid_tlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
 392         ssid_tlv->header.len = cpu_to_le16(user_cfg->ssid_len);
 393         memcpy(ssid_tlv->ssid, user_cfg->ssid, user_cfg->ssid_len);
 394         return sizeof(ssid_tlv->header) + user_cfg->ssid_len;
 395 }
 396
 397
 398 /*
 399  * Add CHANLIST TLV of the form
 400  *
 401  * TLV-ID CHANLIST 01 01
 402  * length          5b 00
 403  * channel 1       00 01 00 00 00 64 00
 404  *   radio type    00
 405  *   channel          01
 406  *   scan type           00
 407  *   min scan time          00 00
 408  *   max scan time                64 00
 409  * channel 2       00 02 00 00 00 64 00
 410  * channel 3       00 03 00 00 00 64 00
 411  * channel 4       00 04 00 00 00 64 00
 412  * channel 5       00 05 00 00 00 64 00
 413  * channel 6       00 06 00 00 00 64 00
 414  * channel 7       00 07 00 00 00 64 00
 415  * channel 8       00 08 00 00 00 64 00
 416  * channel 9       00 09 00 00 00 64 00
 417  * channel 10      00 0a 00 00 00 64 00
 418  * channel 11      00 0b 00 00 00 64 00
 419  * channel 12      00 0c 00 00 00 64 00
 420  * channel 13      00 0d 00 00 00 64 00
 421  *
 422  */
 423 static int lbs_scan_add_chanlist_tlv(u8 *tlv,
 424         struct chanscanparamset *chan_list,
 425         int chan_count)
 426 {
 427         size_t size = sizeof(struct chanscanparamset) * chan_count;
 428         struct mrvlietypes_chanlistparamset *chan_tlv =
 429                 (struct mrvlietypes_chanlistparamset *) tlv;
 430
 431         chan_tlv->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 432         memcpy(chan_tlv->chanscanparam, chan_list, size);
 433         chan_tlv->header.len = cpu_to_le16(size);
 434         return sizeof(chan_tlv->header) + size;
 435 }
 436
 437
 438 /*
 439  * Add RATES TLV of the form
 440  *
 441  * TLV-ID RATES    01 00
 442  * length          0e 00
 443  * rates           82 84 8b 96 0c 12 18 24 30 48 60 6c
 444  *
 445  * The rates are in lbs_bg_rates[], but for the 802.11b
 446  * rates the high bit isn't set.
 447  */
 448 static int lbs_scan_add_rates_tlv(u8 *tlv)
 449 {
 450         int i;
 451         struct mrvlietypes_ratesparamset *rate_tlv =
 452                 (struct mrvlietypes_ratesparamset *) tlv;
 453
 454         rate_tlv->header.type = cpu_to_le16(TLV_TYPE_RATES);
 455         tlv += sizeof(rate_tlv->header);
 456         for (i = 0; i < MAX_RATES; i++) {
 457                 *tlv = lbs_bg_rates[i];
 458                 if (*tlv == 0)
 459                         break;
 460                 /* This code makes sure that the 802.11b rates (1 MBit/s, 2
 461                    MBit/s, 5.5 MBit/s and 11 MBit/s get's the high bit set.
 462                    Note that the values are MBit/s * 2, to mark them as
 463                    basic rates so that the firmware likes it better */
 464                 if (*tlv == 0x02 || *tlv == 0x04 ||
 465                     *tlv == 0x0b || *tlv == 0x16)
 466                         *tlv |= 0x80;
 467                 tlv++;
 468         }
 469         rate_tlv->header.len = cpu_to_le16(i);
 470         return sizeof(rate_tlv->header) + i;
 471 }
 472
 473
 474 /*
 475  * Generate the CMD_802_11_SCAN command with the proper tlv
 476  * for a bunch of channels.
 477  */
 478 static int lbs_do_scan(struct lbs_private *priv,
 479         u8 bsstype,
 480         struct chanscanparamset *chan_list,
 481         int chan_count,
 482         const struct lbs_ioctl_user_scan_cfg *user_cfg)
 483 {
 484         int ret = -ENOMEM;
 485         struct lbs_scan_cmd_config *scan_cmd;
 486         u8 *tlv;    /* pointer into our current, growing TLV storage area */
 487
 488         lbs_deb_enter_args(LBS_DEB_SCAN, "bsstype %d, chanlist[].chan %d, "
 489                 "chan_count %d",
 490                 bsstype, chan_list[0].channumber, chan_count);
 491
 492         /* create the fixed part for scan command */
 493         scan_cmd = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
 494         if (scan_cmd == NULL)
 495                 goto out;
 496         tlv = scan_cmd->tlvbuffer;
 497         if (user_cfg)
 498                 memcpy(scan_cmd->bssid, user_cfg->bssid, ETH_ALEN);
 499         scan_cmd->bsstype = bsstype;
 500
 501         /* add TLVs */
 502         if (user_cfg && user_cfg->ssid_len)
 503                 tlv += lbs_scan_add_ssid_tlv(tlv, user_cfg);
 504         if (chan_list && chan_count)
 505                 tlv += lbs_scan_add_chanlist_tlv(tlv, chan_list, chan_count);
 506         tlv += lbs_scan_add_rates_tlv(tlv);
 507
 508         /* This is the final data we are about to send */
 509         scan_cmd->tlvbufferlen = tlv - scan_cmd->tlvbuffer;
 510         lbs_deb_hex(LBS_DEB_SCAN, "SCAN_CMD", (void *)scan_cmd, 1+6);
 511         lbs_deb_hex(LBS_DEB_SCAN, "SCAN_TLV", scan_cmd->tlvbuffer,
 512                 scan_cmd->tlvbufferlen);
 513
 514         ret = lbs_prepare_and_send_command(priv, CMD_802_11_SCAN, 0,
 515                 CMD_OPTION_WAITFORRSP, 0, scan_cmd);
 516 out:
 517         kfree(scan_cmd);
 518         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 519         return ret;
 520 }
 521
 522
 523 /**
 524  *  @brief Internal function used to start a scan based on an input config
 525  *
 526  *  Also used from debugfs
 527  *
 528  *  Use the input user scan configuration information when provided in
 529  *    order to send the appropriate scan commands to firmware to populate or
 530  *    update the internal driver scan table
 531  *
 532  *  @param priv          A pointer to struct lbs_private structure
 533  *  @param puserscanin   Pointer to the input configuration for the requested
 534  *                       scan.
 535  *
 536  *  @return              0 or < 0 if error
 537  */
 538 int lbs_scan_networks(struct lbs_private *priv,
 539         const struct lbs_ioctl_user_scan_cfg *user_cfg,
 540                        int full_scan)
 541 {
 542         int ret = -ENOMEM;
 543         struct chanscanparamset *chan_list;
 544         struct chanscanparamset *curr_chans;
 545         int chan_count;
 546         u8 bsstype = CMD_BSS_TYPE_ANY;
 547         int numchannels = MRVDRV_CHANNELS_PER_SCAN_CMD;
 548         int filteredscan = 0;
 549         union iwreq_data wrqu;
 550 #ifdef CONFIG_LIBERTAS_DEBUG
 551         struct bss_descriptor *iter;
 552         int i = 0;
 553         DECLARE_MAC_BUF(mac);
 554 #endif
 555
 556         lbs_deb_enter_args(LBS_DEB_SCAN, "full_scan %d",
 557                 full_scan);
 558
 559         /* Cancel any partial outstanding partial scans if this scan
 560          * is a full scan.
 561          */
 562         if (full_scan && delayed_work_pending(&priv->scan_work))
 563                 cancel_delayed_work(&priv->scan_work);
 564
 565         /* Determine same scan parameters */
 566         if (user_cfg) {
 567                 if (user_cfg->bsstype)
 568                         bsstype = user_cfg->bsstype;
 569                 if (compare_ether_addr(user_cfg->bssid, &zeromac[0]) != 0) {
 570                         numchannels = MRVDRV_MAX_CHANNELS_PER_SCAN;
 571                         filteredscan = 1;
 572                 }
 573         }
 574         lbs_deb_scan("numchannels %d, bsstype %d, "
 575                 "filteredscan %d\n",
 576                 numchannels, bsstype, filteredscan);
 577
 578         /* Create list of channels to scan */
 579         chan_list = kzalloc(sizeof(struct chanscanparamset) *
 580                                 LBS_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
 581         if (!chan_list) {
 582                 lbs_pr_alert("SCAN: chan_list empty\n");
 583                 goto out;
 584         }
 585
 586         /* We want to scan all channels */
 587         chan_count = lbs_scan_create_channel_list(priv, chan_list,
 588                 filteredscan);
 589
 590         netif_stop_queue(priv->dev);
 591         netif_carrier_off(priv->dev);
 592         if (priv->mesh_dev) {
 593                 netif_stop_queue(priv->mesh_dev);
 594                 netif_carrier_off(priv->mesh_dev);
 595         }
 596
 597         /* Prepare to continue an interrupted scan */
 598         lbs_deb_scan("chan_count %d, last_scanned_channel %d\n",
 599                      chan_count, priv->last_scanned_channel);
 600         curr_chans = chan_list;
 601         /* advance channel list by already-scanned-channels */
 602         if (priv->last_scanned_channel > 0) {
 603                 curr_chans += priv->last_scanned_channel;
 604                 chan_count -= priv->last_scanned_channel;
 605         }
 606
 607         /* Send scan command(s)
 608          * numchannels contains the number of channels we should maximally scan
 609          * chan_count is the total number of channels to scan
 610          */
 611
 612         while (chan_count) {
 613                 int to_scan = min(numchannels, chan_count);
 614                 lbs_deb_scan("scanning %d of %d channels\n",
 615                         to_scan, chan_count);
 616                 ret = lbs_do_scan(priv, bsstype, curr_chans,
 617                         to_scan, user_cfg);
 618                 if (ret) {
 619                         lbs_pr_err("SCAN_CMD failed\n");
 620                         goto out2;
 621                 }
 622                 curr_chans += to_scan;
 623                 chan_count -= to_scan;
 624
 625                 /* somehow schedule the next part of the scan */
 626                 if (chan_count &&
 627                     !full_scan &&
 628                     !priv->surpriseremoved) {
 629                         /* -1 marks just that we're currently scanning */
 630                         if (priv->last_scanned_channel < 0)
 631                                 priv->last_scanned_channel = to_scan;
 632                         else
 633                                 priv->last_scanned_channel += to_scan;
 634                         cancel_delayed_work(&priv->scan_work);
 635                         queue_delayed_work(priv->work_thread, &priv->scan_work,
 636                                 msecs_to_jiffies(300));
 637                         /* skip over GIWSCAN event */
 638                         goto out;
 639                 }
 640
 641         }
 642         memset(&wrqu, 0, sizeof(union iwreq_data));
 643         wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
 644
 645 #ifdef CONFIG_LIBERTAS_DEBUG
 646         /* Dump the scan table */
 647         mutex_lock(&priv->lock);
 648         lbs_deb_scan("scan table:\n");
 649         list_for_each_entry(iter, &priv->network_list, list)
 650                 lbs_deb_scan("%02d: BSSID %s, RSSI %d, SSID '%s'\n",
 651                        i++, print_mac(mac, iter->bssid), (s32) iter->rssi,
 652                        escape_essid(iter->ssid, iter->ssid_len));
 653         mutex_unlock(&priv->lock);
 654 #endif
 655
 656 out2:
 657         priv->last_scanned_channel = 0;
 658
 659 out:
 660         if (priv->connect_status == LBS_CONNECTED) {
 661                 netif_carrier_on(priv->dev);
 662                 if (!priv->tx_pending_len)
 663                         netif_wake_queue(priv->dev);
 664         }
 665         if (priv->mesh_dev && (priv->mesh_connect_status == LBS_CONNECTED)) {
 666                 netif_carrier_on(priv->mesh_dev);
 667                 if (!priv->tx_pending_len)
 668                         netif_wake_queue(priv->mesh_dev);
 669         }
 670         kfree(chan_list);
 671
 672         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 673         return ret;
 674 }
 675
 676
 677
 678
 679 /*********************************************************************/
 680 /*                                                                   */
 681 /*  Result interpretation                                            */
 682 /*                                                                   */
 683 /*********************************************************************/
 684
 685 /**
 686  *  @brief Interpret a BSS scan response returned from the firmware
 687  *
 688  *  Parse the various fixed fields and IEs passed back for a a BSS probe
 689  *  response or beacon from the scan command.  Record information as needed
 690  *  in the scan table struct bss_descriptor for that entry.
 691  *
 692  *  @param bss  Output parameter: Pointer to the BSS Entry
 693  *
 694  *  @return             0 or -1
 695  */
 696 static int lbs_process_bss(struct bss_descriptor *bss,
 697                                 u8 ** pbeaconinfo, int *bytesleft)
 698 {
 699         struct ieeetypes_fhparamset *pFH;
 700         struct ieeetypes_dsparamset *pDS;
 701         struct ieeetypes_cfparamset *pCF;
 702         struct ieeetypes_ibssparamset *pibss;
 703         DECLARE_MAC_BUF(mac);
 704         struct ieeetypes_countryinfoset *pcountryinfo;
 705         u8 *pos, *end, *p;
 706         u8 n_ex_rates = 0, got_basic_rates = 0, n_basic_rates = 0;
 707         u16 beaconsize = 0;
 708         int ret;
 709
 710         lbs_deb_enter(LBS_DEB_SCAN);
 711
 712         if (*bytesleft >= sizeof(beaconsize)) {
 713                 /* Extract & convert beacon size from the command buffer */
 714                 beaconsize = le16_to_cpu(get_unaligned((__le16 *)*pbeaconinfo));
 715                 *bytesleft -= sizeof(beaconsize);
 716                 *pbeaconinfo += sizeof(beaconsize);
 717         }
 718
 719         if (beaconsize == 0 || beaconsize > *bytesleft) {
 720                 *pbeaconinfo += *bytesleft;
 721                 *bytesleft = 0;
 722                 ret = -1;
 723                 goto done;
 724         }
 725
 726         /* Initialize the current working beacon pointer for this BSS iteration */
 727         pos = *pbeaconinfo;
 728         end = pos + beaconsize;
 729
 730         /* Advance the return beacon pointer past the current beacon */
 731         *pbeaconinfo += beaconsize;
 732         *bytesleft -= beaconsize;
 733
 734         memcpy(bss->bssid, pos, ETH_ALEN);
 735         lbs_deb_scan("process_bss: BSSID %s\n", print_mac(mac, bss->bssid));
 736         pos += ETH_ALEN;
 737
 738         if ((end - pos) < 12) {
 739                 lbs_deb_scan("process_bss: Not enough bytes left\n");
 740                 ret = -1;
 741                 goto done;
 742         }
 743
 744         /*
 745          * next 4 fields are RSSI, time stamp, beacon interval,
 746          *   and capability information
 747          */
 748
 749         /* RSSI is 1 byte long */
 750         bss->rssi = *pos;
 751         lbs_deb_scan("process_bss: RSSI %d\n", *pos);
 752         pos++;
 753
 754         /* time stamp is 8 bytes long */
 755         pos += 8;
 756
 757         /* beacon interval is 2 bytes long */
 758         bss->beaconperiod = le16_to_cpup((void *) pos);
 759         pos += 2;
 760
 761         /* capability information is 2 bytes long */
 762         bss->capability = le16_to_cpup((void *) pos);
 763         lbs_deb_scan("process_bss: capabilities 0x%04x\n", bss->capability);
 764         pos += 2;
 765
 766         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 767                 lbs_deb_scan("process_bss: WEP enabled\n");
 768         if (bss->capability & WLAN_CAPABILITY_IBSS)
 769                 bss->mode = IW_MODE_ADHOC;
 770         else
 771                 bss->mode = IW_MODE_INFRA;
 772
 773         /* rest of the current buffer are IE's */
 774         lbs_deb_scan("process_bss: IE len %zd\n", end - pos);
 775         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: IE info", pos, end - pos);
 776
 777         /* process variable IE */
 778         while (pos <= end - 2) {
 779                 struct ieee80211_info_element * elem =
 780                         (struct ieee80211_info_element *) pos;
 781
 782                 if (pos + elem->len > end) {
 783                         lbs_deb_scan("process_bss: error in processing IE, "
 784                                "bytes left < IE length\n");
 785                         break;
 786                 }
 787
 788                 switch (elem->id) {
 789                 case MFIE_TYPE_SSID:
 790                         bss->ssid_len = elem->len;
 791                         memcpy(bss->ssid, elem->data, elem->len);
 792                         lbs_deb_scan("got SSID IE: '%s', len %u\n",
 793                                      escape_essid(bss->ssid, bss->ssid_len),
 794                                      bss->ssid_len);
 795                         break;
 796
 797                 case MFIE_TYPE_RATES:
 798                         n_basic_rates = min_t(u8, MAX_RATES, elem->len);
 799                         memcpy(bss->rates, elem->data, n_basic_rates);
 800                         got_basic_rates = 1;
 801                         lbs_deb_scan("got RATES IE\n");
 802                         break;
 803
 804                 case MFIE_TYPE_FH_SET:
 805                         pFH = (struct ieeetypes_fhparamset *) pos;
 806                         memmove(&bss->phyparamset.fhparamset, pFH,
 807                                 sizeof(struct ieeetypes_fhparamset));
 808                         lbs_deb_scan("got FH IE\n");
 809                         break;
 810
 811                 case MFIE_TYPE_DS_SET:
 812                         pDS = (struct ieeetypes_dsparamset *) pos;
 813                         bss->channel = pDS->currentchan;
 814                         memcpy(&bss->phyparamset.dsparamset, pDS,
 815                                sizeof(struct ieeetypes_dsparamset));
 816                         lbs_deb_scan("got DS IE, channel %d\n", bss->channel);
 817                         break;
 818
 819                 case MFIE_TYPE_CF_SET:
 820                         pCF = (struct ieeetypes_cfparamset *) pos;
 821                         memcpy(&bss->ssparamset.cfparamset, pCF,
 822                                sizeof(struct ieeetypes_cfparamset));
 823                         lbs_deb_scan("got CF IE\n");
 824                         break;
 825
 826                 case MFIE_TYPE_IBSS_SET:
 827                         pibss = (struct ieeetypes_ibssparamset *) pos;
 828                         bss->atimwindow = le16_to_cpu(pibss->atimwindow);
 829                         memmove(&bss->ssparamset.ibssparamset, pibss,
 830                                 sizeof(struct ieeetypes_ibssparamset));
 831                         lbs_deb_scan("got IBSS IE\n");
 832                         break;
 833
 834                 case MFIE_TYPE_COUNTRY:
 835                         pcountryinfo = (struct ieeetypes_countryinfoset *) pos;
 836                         lbs_deb_scan("got COUNTRY IE\n");
 837                         if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
 838                             || pcountryinfo->len > 254) {
 839                                 lbs_deb_scan("process_bss: 11D- Err "
 840                                        "CountryInfo len %d, min %zd, max 254\n",
 841                                        pcountryinfo->len,
 842                                        sizeof(pcountryinfo->countrycode));
 843                                 ret = -1;
 844                                 goto done;
 845                         }
 846
 847                         memcpy(&bss->countryinfo,
 848                                pcountryinfo, pcountryinfo->len + 2);
 849                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: 11d countryinfo",
 850                                 (u8 *) pcountryinfo,
 851                                 (u32) (pcountryinfo->len + 2));
 852                         break;
 853
 854                 case MFIE_TYPE_RATES_EX:
 855                         /* only process extended supported rate if data rate is
 856                          * already found. Data rate IE should come before
 857                          * extended supported rate IE
 858                          */
 859                         lbs_deb_scan("got RATESEX IE\n");
 860                         if (!got_basic_rates) {
 861                                 lbs_deb_scan("... but ignoring it\n");
 862                                 break;
 863                         }
 864
 865                         n_ex_rates = elem->len;
 866                         if (n_basic_rates + n_ex_rates > MAX_RATES)
 867                                 n_ex_rates = MAX_RATES - n_basic_rates;
 868
 869                         p = bss->rates + n_basic_rates;
 870                         memcpy(p, elem->data, n_ex_rates);
 871                         break;
 872
 873                 case MFIE_TYPE_GENERIC:
 874                         if (elem->len >= 4 &&
 875                             elem->data[0] == 0x00 &&
 876                             elem->data[1] == 0x50 &&
 877                             elem->data[2] == 0xf2 &&
 878                             elem->data[3] == 0x01) {
 879                                 bss->wpa_ie_len = min(elem->len + 2,
 880                                                       MAX_WPA_IE_LEN);
 881                                 memcpy(bss->wpa_ie, elem, bss->wpa_ie_len);
 882                                 lbs_deb_scan("got WPA IE\n");
 883                                 lbs_deb_hex(LBS_DEB_SCAN, "WPA IE", bss->wpa_ie,
 884                                             elem->len);
 885                         } else if (elem->len >= MARVELL_MESH_IE_LENGTH &&
 886                             elem->data[0] == 0x00 &&
 887                             elem->data[1] == 0x50 &&
 888                             elem->data[2] == 0x43 &&
 889                             elem->data[3] == 0x04) {
 890                                 lbs_deb_scan("got mesh IE\n");
 891                                 bss->mesh = 1;
 892                         } else {
 893                                 lbs_deb_scan("got generiec IE: "
 894                                         "%02x:%02x:%02x:%02x, len %d\n",
 895                                         elem->data[0], elem->data[1],
 896                                         elem->data[2], elem->data[3],
 897                                         elem->len);
 898                         }
 899                         break;
 900
 901                 case MFIE_TYPE_RSN:
 902                         lbs_deb_scan("got RSN IE\n");
 903                         bss->rsn_ie_len = min(elem->len + 2, MAX_WPA_IE_LEN);
 904                         memcpy(bss->rsn_ie, elem, bss->rsn_ie_len);
 905                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: RSN_IE",
 906                                 bss->rsn_ie, elem->len);
 907                         break;
 908
 909                 default:
 910                         lbs_deb_scan("got IE 0x%04x, len %d\n",
 911                                 elem->id, elem->len);
 912                         break;
 913                 }
 914
 915                 pos += elem->len + 2;
 916         }
 917
 918         /* Timestamp */
 919         bss->last_scanned = jiffies;
 920         lbs_unset_basic_rate_flags(bss->rates, sizeof(bss->rates));
 921
 922         ret = 0;
 923
 924 done:
 925         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
 926         return ret;
 927 }
 928
 929 /**
 930  *  @brief This function finds a specific compatible BSSID in the scan list
 931  *
 932  *  Used in association code
 933  *
 934  *  @param priv  A pointer to struct lbs_private
 935  *  @param bssid    BSSID to find in the scan list
 936  *  @param mode     Network mode: Infrastructure or IBSS
 937  *
 938  *  @return         index in BSSID list, or error return code (< 0)
 939  */
 940 struct bss_descriptor *lbs_find_bssid_in_list(struct lbs_private *priv,
 941                 u8 * bssid, u8 mode)
 942 {
 943         struct bss_descriptor * iter_bss;
 944         struct bss_descriptor * found_bss = NULL;
 945
 946         lbs_deb_enter(LBS_DEB_SCAN);
 947
 948         if (!bssid)
 949                 goto out;
 950
 951         lbs_deb_hex(LBS_DEB_SCAN, "looking for",
 952                 bssid, ETH_ALEN);
 953
 954         /* Look through the scan table for a compatible match.  The loop will
 955          *   continue past a matched bssid that is not compatible in case there
 956          *   is an AP with multiple SSIDs assigned to the same BSSID
 957          */
 958         mutex_lock(&priv->lock);
 959         list_for_each_entry (iter_bss, &priv->network_list, list) {
 960                 if (compare_ether_addr(iter_bss->bssid, bssid))
 961                         continue; /* bssid doesn't match */
 962                 switch (mode) {
 963                 case IW_MODE_INFRA:
 964                 case IW_MODE_ADHOC:
 965                         if (!is_network_compatible(priv, iter_bss, mode))
 966                                 break;
 967                         found_bss = iter_bss;
 968                         break;
 969                 default:
 970                         found_bss = iter_bss;
 971                         break;
 972                 }
 973         }
 974         mutex_unlock(&priv->lock);
 975
 976 out:
 977         lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss);
 978         return found_bss;
 979 }
 980
 981 /**
 982  *  @brief This function finds ssid in ssid list.
 983  *
 984  *  Used in association code
 985  *
 986  *  @param priv  A pointer to struct lbs_private
 987  *  @param ssid     SSID to find in the list
 988  *  @param bssid    BSSID to qualify the SSID selection (if provided)
 989  *  @param mode     Network mode: Infrastructure or IBSS
 990  *
 991  *  @return         index in BSSID list
 992  */
 993 struct bss_descriptor *lbs_find_ssid_in_list(struct lbs_private *priv,
 994                    u8 *ssid, u8 ssid_len, u8 * bssid, u8 mode,
 995                    int channel)
 996 {
 997         u8 bestrssi = 0;
 998         struct bss_descriptor * iter_bss = NULL;
 999         struct bss_descriptor * found_bss = NULL;
1000         struct bss_descriptor * tmp_oldest = NULL;
1001
1002         lbs_deb_enter(LBS_DEB_SCAN);
1003
1004         mutex_lock(&priv->lock);
1005
1006         list_for_each_entry (iter_bss, &priv->network_list, list) {
1007                 if (   !tmp_oldest
1008                     || (iter_bss->last_scanned < tmp_oldest->last_scanned))
1009                         tmp_oldest = iter_bss;
1010
1011                 if (lbs_ssid_cmp(iter_bss->ssid, iter_bss->ssid_len,
1012                                       ssid, ssid_len) != 0)
1013                         continue; /* ssid doesn't match */
1014                 if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
1015                         continue; /* bssid doesn't match */
1016                 if ((channel > 0) && (iter_bss->channel != channel))
1017                         continue; /* channel doesn't match */
1018
1019                 switch (mode) {
1020                 case IW_MODE_INFRA:
1021                 case IW_MODE_ADHOC:
1022                         if (!is_network_compatible(priv, iter_bss, mode))
1023                                 break;
1024
1025                         if (bssid) {
1026                                 /* Found requested BSSID */
1027                                 found_bss = iter_bss;
1028                                 goto out;
1029                         }
1030
1031                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1032                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1033                                 found_bss = iter_bss;
1034                         }
1035                         break;
1036                 case IW_MODE_AUTO:
1037                 default:
1038                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1039                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1040                                 found_bss = iter_bss;
1041                         }
1042                         break;
1043                 }
1044         }
1045
1046 out:
1047         mutex_unlock(&priv->lock);
1048         lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss);
1049         return found_bss;
1050 }
1051
1052 /**
1053  *  @brief This function finds the best SSID in the Scan List
1054  *
1055  *  Search the scan table for the best SSID that also matches the current
1056  *   adapter network preference (infrastructure or adhoc)
1057  *
1058  *  @param priv  A pointer to struct lbs_private
1059  *
1060  *  @return         index in BSSID list
1061  */
1062 static struct bss_descriptor *lbs_find_best_ssid_in_list(
1063         struct lbs_private *priv,
1064         u8 mode)
1065 {
1066         u8 bestrssi = 0;
1067         struct bss_descriptor * iter_bss;
1068         struct bss_descriptor * best_bss = NULL;
1069
1070         lbs_deb_enter(LBS_DEB_SCAN);
1071
1072         mutex_lock(&priv->lock);
1073
1074         list_for_each_entry (iter_bss, &priv->network_list, list) {
1075                 switch (mode) {
1076                 case IW_MODE_INFRA:
1077                 case IW_MODE_ADHOC:
1078                         if (!is_network_compatible(priv, iter_bss, mode))
1079                                 break;
1080                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1081                                 break;
1082                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1083                         best_bss = iter_bss;
1084                         break;
1085                 case IW_MODE_AUTO:
1086                 default:
1087                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1088                                 break;
1089                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1090                         best_bss = iter_bss;
1091                         break;
1092                 }
1093         }
1094
1095         mutex_unlock(&priv->lock);
1096         lbs_deb_leave_args(LBS_DEB_SCAN, "best_bss %p", best_bss);
1097         return best_bss;
1098 }
1099
1100 /**
1101  *  @brief Find the AP with specific ssid in the scan list
1102  *
1103  *  Used from association worker.
1104  *
1105  *  @param priv         A pointer to struct lbs_private structure
1106  *  @param pSSID        A pointer to AP's ssid
1107  *
1108  *  @return             0--success, otherwise--fail
1109  */
1110 int lbs_find_best_network_ssid(struct lbs_private *priv,
1111                 u8 *out_ssid, u8 *out_ssid_len, u8 preferred_mode, u8 *out_mode)
1112 {
1113         int ret = -1;
1114         struct bss_descriptor * found;
1115
1116         lbs_deb_enter(LBS_DEB_SCAN);
1117
1118         lbs_scan_networks(priv, NULL, 1);
1119         if (priv->surpriseremoved)
1120                 goto out;
1121
1122         found = lbs_find_best_ssid_in_list(priv, preferred_mode);
1123         if (found && (found->ssid_len > 0)) {
1124                 memcpy(out_ssid, &found->ssid, IW_ESSID_MAX_SIZE);
1125                 *out_ssid_len = found->ssid_len;
1126                 *out_mode = found->mode;
1127                 ret = 0;
1128         }
1129
1130 out:
1131         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1132         return ret;
1133 }
1134
1135
1136 /**
1137  *  @brief Send a scan command for all available channels filtered on a spec
1138  *
1139  *  Used in association code and from debugfs
1140  *
1141  *  @param priv             A pointer to struct lbs_private structure
1142  *  @param ssid             A pointer to the SSID to scan for
1143  *  @param ssid_len         Length of the SSID
1144  *  @param clear_ssid       Should existing scan results with this SSID
1145  *                          be cleared?
1146  *
1147  *  @return                0-success, otherwise fail
1148  */
1149 int lbs_send_specific_ssid_scan(struct lbs_private *priv,
1150                         u8 *ssid, u8 ssid_len, u8 clear_ssid)
1151 {
1152         struct lbs_ioctl_user_scan_cfg scancfg;
1153         int ret = 0;
1154
1155         lbs_deb_enter_args(LBS_DEB_SCAN, "SSID '%s', clear %d",
1156                 escape_essid(ssid, ssid_len), clear_ssid);
1157
1158         if (!ssid_len)
1159                 goto out;
1160
1161         memset(&scancfg, 0x00, sizeof(scancfg));
1162         memcpy(scancfg.ssid, ssid, ssid_len);
1163         scancfg.ssid_len = ssid_len;
1164         scancfg.clear_ssid = clear_ssid;
1165
1166         lbs_scan_networks(priv, &scancfg, 1);
1167         if (priv->surpriseremoved) {
1168                 ret = -1;
1169                 goto out;
1170         }
1171
1172 out:
1173         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1174         return ret;
1175 }
1176
1177
1178
1179
1180 /*********************************************************************/
1181 /*                                                                   */
1182 /*  Support for Wireless Extensions                                  */
1183 /*                                                                   */
1184 /*********************************************************************/
1185
1186
1187 #define MAX_CUSTOM_LEN 64
1188
1189 static inline char *lbs_translate_scan(struct lbs_private *priv,
1190                                         char *start, char *stop,
1191                                         struct bss_descriptor *bss)
1192 {
1193         struct chan_freq_power *cfp;
1194         char *current_val;      /* For rates */
1195         struct iw_event iwe;    /* Temporary buffer */
1196         int j;
1197 #define PERFECT_RSSI ((u8)50)
1198 #define WORST_RSSI   ((u8)0)
1199 #define RSSI_DIFF    ((u8)(PERFECT_RSSI - WORST_RSSI))
1200         u8 rssi;
1201
1202         lbs_deb_enter(LBS_DEB_SCAN);
1203
1204         cfp = lbs_find_cfp_by_band_and_channel(priv, 0, bss->channel);
1205         if (!cfp) {
1206                 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1207                 start = NULL;
1208                 goto out;
1209         }
1210
1211         /* First entry *MUST* be the BSSID */
1212         iwe.cmd = SIOCGIWAP;
1213         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1214         memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1215         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1216
1217         /* SSID */
1218         iwe.cmd = SIOCGIWESSID;
1219         iwe.u.data.flags = 1;
1220         iwe.u.data.length = min((u32) bss->ssid_len, (u32) IW_ESSID_MAX_SIZE);
1221         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1222
1223         /* Mode */
1224         iwe.cmd = SIOCGIWMODE;
1225         iwe.u.mode = bss->mode;
1226         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1227
1228         /* Frequency */
1229         iwe.cmd = SIOCGIWFREQ;
1230         iwe.u.freq.m = (long)cfp->freq * 100000;
1231         iwe.u.freq.e = 1;
1232         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1233
1234         /* Add quality statistics */
1235         iwe.cmd = IWEVQUAL;
1236         iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1237         iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1238
1239         rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1240         iwe.u.qual.qual =
1241             (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1242              (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1243             (RSSI_DIFF * RSSI_DIFF);
1244         if (iwe.u.qual.qual > 100)
1245                 iwe.u.qual.qual = 100;
1246
1247         if (priv->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1248                 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1249         } else {
1250                 iwe.u.qual.noise =
1251                     CAL_NF(priv->NF[TYPE_BEACON][TYPE_NOAVG]);
1252         }
1253
1254         /* Locally created ad-hoc BSSs won't have beacons if this is the
1255          * only station in the adhoc network; so get signal strength
1256          * from receive statistics.
1257          */
1258         if ((priv->mode == IW_MODE_ADHOC)
1259             && priv->adhoccreate
1260             && !lbs_ssid_cmp(priv->curbssparams.ssid,
1261                                   priv->curbssparams.ssid_len,
1262                                   bss->ssid, bss->ssid_len)) {
1263                 int snr, nf;
1264                 snr = priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1265                 nf = priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1266                 iwe.u.qual.level = CAL_RSSI(snr, nf);
1267         }
1268         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
1269
1270         /* Add encryption capability */
1271         iwe.cmd = SIOCGIWENCODE;
1272         if (bss->capability & WLAN_CAPABILITY_PRIVACY) {
1273                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1274         } else {
1275                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1276         }
1277         iwe.u.data.length = 0;
1278         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1279
1280         current_val = start + IW_EV_LCP_LEN;
1281
1282         iwe.cmd = SIOCGIWRATE;
1283         iwe.u.bitrate.fixed = 0;
1284         iwe.u.bitrate.disabled = 0;
1285         iwe.u.bitrate.value = 0;
1286
1287         for (j = 0; bss->rates[j] && (j < sizeof(bss->rates)); j++) {
1288                 /* Bit rate given in 500 kb/s units */
1289                 iwe.u.bitrate.value = bss->rates[j] * 500000;
1290                 current_val = iwe_stream_add_value(start, current_val,
1291                                          stop, &iwe, IW_EV_PARAM_LEN);
1292         }
1293         if ((bss->mode == IW_MODE_ADHOC)
1294             && !lbs_ssid_cmp(priv->curbssparams.ssid,
1295                                   priv->curbssparams.ssid_len,
1296                                   bss->ssid, bss->ssid_len)
1297             && priv->adhoccreate) {
1298                 iwe.u.bitrate.value = 22 * 500000;
1299                 current_val = iwe_stream_add_value(start, current_val,
1300                                          stop, &iwe, IW_EV_PARAM_LEN);
1301         }
1302         /* Check if we added any event */
1303         if((current_val - start) > IW_EV_LCP_LEN)
1304                 start = current_val;
1305
1306         memset(&iwe, 0, sizeof(iwe));
1307         if (bss->wpa_ie_len) {
1308                 char buf[MAX_WPA_IE_LEN];
1309                 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1310                 iwe.cmd = IWEVGENIE;
1311                 iwe.u.data.length = bss->wpa_ie_len;
1312                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1313         }
1314
1315         memset(&iwe, 0, sizeof(iwe));
1316         if (bss->rsn_ie_len) {
1317                 char buf[MAX_WPA_IE_LEN];
1318                 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1319                 iwe.cmd = IWEVGENIE;
1320                 iwe.u.data.length = bss->rsn_ie_len;
1321                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1322         }
1323
1324         if (bss->mesh) {
1325                 char custom[MAX_CUSTOM_LEN];
1326                 char *p = custom;
1327
1328                 iwe.cmd = IWEVCUSTOM;
1329                 p += snprintf(p, MAX_CUSTOM_LEN - (p - custom),
1330                               "mesh-type: olpc");
1331                 iwe.u.data.length = p - custom;
1332                 if (iwe.u.data.length)
1333                         start = iwe_stream_add_point(start, stop, &iwe, custom);
1334         }
1335
1336 out:
1337         lbs_deb_leave_args(LBS_DEB_SCAN, "start %p", start);
1338         return start;
1339 }
1340
1341
1342 /**
1343  *  @brief Handle Scan Network ioctl
1344  *
1345  *  @param dev          A pointer to net_device structure
1346  *  @param info         A pointer to iw_request_info structure
1347  *  @param vwrq         A pointer to iw_param structure
1348  *  @param extra        A pointer to extra data buf
1349  *
1350  *  @return             0 --success, otherwise fail
1351  */
1352 int lbs_set_scan(struct net_device *dev, struct iw_request_info *info,
1353                   struct iw_param *wrqu, char *extra)
1354 {
1355         struct lbs_private *priv = dev->priv;
1356
1357         lbs_deb_enter(LBS_DEB_SCAN);
1358
1359         if (!netif_running(dev))
1360                 return -ENETDOWN;
1361
1362         /* mac80211 does this:
1363         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1364         if (sdata->type != IEEE80211_IF_TYPE_xxx)
1365                 return -EOPNOTSUPP;
1366
1367         if (wrqu->data.length == sizeof(struct iw_scan_req) &&
1368             wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1369                 req = (struct iw_scan_req *)extra;
1370                         ssid = req->essid;
1371                 ssid_len = req->essid_len;
1372         }
1373         */
1374
1375         if (!delayed_work_pending(&priv->scan_work))
1376                 queue_delayed_work(priv->work_thread, &priv->scan_work,
1377                         msecs_to_jiffies(50));
1378         /* set marker that currently a scan is taking place */
1379         priv->last_scanned_channel = -1;
1380
1381         if (priv->surpriseremoved)
1382                 return -EIO;
1383
1384         lbs_deb_leave(LBS_DEB_SCAN);
1385         return 0;
1386 }
1387
1388
1389 /**
1390  *  @brief  Handle Retrieve scan table ioctl
1391  *
1392  *  @param dev          A pointer to net_device structure
1393  *  @param info         A pointer to iw_request_info structure
1394  *  @param dwrq         A pointer to iw_point structure
1395  *  @param extra        A pointer to extra data buf
1396  *
1397  *  @return             0 --success, otherwise fail
1398  */
1399 int lbs_get_scan(struct net_device *dev, struct iw_request_info *info,
1400                   struct iw_point *dwrq, char *extra)
1401 {
1402 #define SCAN_ITEM_SIZE 128
1403         struct lbs_private *priv = dev->priv;
1404         int err = 0;
1405         char *ev = extra;
1406         char *stop = ev + dwrq->length;
1407         struct bss_descriptor * iter_bss;
1408         struct bss_descriptor * safe;
1409
1410         lbs_deb_enter(LBS_DEB_SCAN);
1411
1412         /* iwlist should wait until the current scan is finished */
1413         if (priv->last_scanned_channel)
1414                 return -EAGAIN;
1415
1416         /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1417         if ((priv->mode == IW_MODE_ADHOC) && priv->adhoccreate) {
1418                 lbs_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
1419                                         CMD_OPTION_WAITFORRSP, 0, NULL);
1420         }
1421
1422         mutex_lock(&priv->lock);
1423         list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) {
1424                 char * next_ev;
1425                 unsigned long stale_time;
1426
1427                 if (stop - ev < SCAN_ITEM_SIZE) {
1428                         err = -E2BIG;
1429                         break;
1430                 }
1431
1432                 /* For mesh device, list only mesh networks */
1433                 if (dev == priv->mesh_dev && !iter_bss->mesh)
1434                         continue;
1435
1436                 /* Prune old an old scan result */
1437                 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1438                 if (time_after(jiffies, stale_time)) {
1439                         list_move_tail (&iter_bss->list,
1440                                         &priv->network_free_list);
1441                         clear_bss_descriptor(iter_bss);
1442                         continue;
1443                 }
1444
1445                 /* Translate to WE format this entry */
1446                 next_ev = lbs_translate_scan(priv, ev, stop, iter_bss);
1447                 if (next_ev == NULL)
1448                         continue;
1449                 ev = next_ev;
1450         }
1451         mutex_unlock(&priv->lock);
1452
1453         dwrq->length = (ev - extra);
1454         dwrq->flags = 0;
1455
1456         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", err);
1457         return err;
1458 }
1459
1460
1461
1462
1463 /*********************************************************************/
1464 /*                                                                   */
1465 /*  Command execution                                                */
1466 /*                                                                   */
1467 /*********************************************************************/
1468
1469
1470 /**
1471  *  @brief Prepare a scan command to be sent to the firmware
1472  *
1473  *  Called via lbs_prepare_and_send_command(priv, CMD_802_11_SCAN, ...)
1474  *  from cmd.c
1475  *
1476  *  Sends a fixed length data part (specifying the BSS type and BSSID filters)
1477  *  as well as a variable number/length of TLVs to the firmware.
1478  *
1479  *  @param priv       A pointer to struct lbs_private structure
1480  *  @param cmd        A pointer to cmd_ds_command structure to be sent to
1481  *                    firmware with the cmd_DS_801_11_SCAN structure
1482  *  @param pdata_buf  Void pointer cast of a lbs_scan_cmd_config struct used
1483  *                    to set the fields/TLVs for the command sent to firmware
1484  *
1485  *  @return           0 or -1
1486  */
1487 int lbs_cmd_80211_scan(struct lbs_private *priv,
1488         struct cmd_ds_command *cmd, void *pdata_buf)
1489 {
1490         struct cmd_ds_802_11_scan *pscan = &cmd->params.scan;
1491         struct lbs_scan_cmd_config *pscancfg = pdata_buf;
1492
1493         lbs_deb_enter(LBS_DEB_SCAN);
1494
1495         /* Set fixed field variables in scan command */
1496         pscan->bsstype = pscancfg->bsstype;
1497         memcpy(pscan->bssid, pscancfg->bssid, ETH_ALEN);
1498         memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen);
1499
1500         /* size is equal to the sizeof(fixed portions) + the TLV len + header */
1501         cmd->size = cpu_to_le16(sizeof(pscan->bsstype) + ETH_ALEN
1502                                 + pscancfg->tlvbufferlen + S_DS_GEN);
1503
1504         lbs_deb_leave(LBS_DEB_SCAN);
1505         return 0;
1506 }
1507
1508 /**
1509  *  @brief This function handles the command response of scan
1510  *
1511  *  Called from handle_cmd_response() in cmdrespc.
1512  *
1513  *   The response buffer for the scan command has the following
1514  *      memory layout:
1515  *
1516  *     .-----------------------------------------------------------.
1517  *     |  header (4 * sizeof(u16)):  Standard command response hdr |
1518  *     .-----------------------------------------------------------.
1519  *     |  bufsize (u16) : sizeof the BSS Description data          |
1520  *     .-----------------------------------------------------------.
1521  *     |  NumOfSet (u8) : Number of BSS Descs returned             |
1522  *     .-----------------------------------------------------------.
1523  *     |  BSSDescription data (variable, size given in bufsize)    |
1524  *     .-----------------------------------------------------------.
1525  *     |  TLV data (variable, size calculated using header->size,  |
1526  *     |            bufsize and sizeof the fixed fields above)     |
1527  *     .-----------------------------------------------------------.
1528  *
1529  *  @param priv    A pointer to struct lbs_private structure
1530  *  @param resp    A pointer to cmd_ds_command
1531  *
1532  *  @return        0 or -1
1533  */
1534 int lbs_ret_80211_scan(struct lbs_private *priv, struct cmd_ds_command *resp)
1535 {
1536         struct cmd_ds_802_11_scan_rsp *pscan;
1537         struct bss_descriptor * iter_bss;
1538         struct bss_descriptor * safe;
1539         u8 *pbssinfo;
1540         u16 scanrespsize;
1541         int bytesleft;
1542         int idx;
1543         int tlvbufsize;
1544         int ret;
1545
1546         lbs_deb_enter(LBS_DEB_SCAN);
1547
1548         /* Prune old entries from scan table */
1549         list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) {
1550                 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1551                 if (time_before(jiffies, stale_time))
1552                         continue;
1553                 list_move_tail (&iter_bss->list, &priv->network_free_list);
1554                 clear_bss_descriptor(iter_bss);
1555         }
1556
1557         pscan = &resp->params.scanresp;
1558
1559         if (pscan->nr_sets > MAX_NETWORK_COUNT) {
1560                 lbs_deb_scan(
1561                        "SCAN_RESP: too many scan results (%d, max %d)!!\n",
1562                        pscan->nr_sets, MAX_NETWORK_COUNT);
1563                 ret = -1;
1564                 goto done;
1565         }
1566
1567         bytesleft = le16_to_cpu(pscan->bssdescriptsize);
1568         lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1569
1570         scanrespsize = le16_to_cpu(resp->size);
1571         lbs_deb_scan("SCAN_RESP: scan results %d\n", pscan->nr_sets);
1572
1573         pbssinfo = pscan->bssdesc_and_tlvbuffer;
1574
1575         /* The size of the TLV buffer is equal to the entire command response
1576          *   size (scanrespsize) minus the fixed fields (sizeof()'s), the
1577          *   BSS Descriptions (bssdescriptsize as bytesLef) and the command
1578          *   response header (S_DS_GEN)
1579          */
1580         tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize)
1581                                      + sizeof(pscan->nr_sets)
1582                                      + S_DS_GEN);
1583
1584         /*
1585          *  Process each scan response returned (pscan->nr_sets).  Save
1586          *    the information in the newbssentry and then insert into the
1587          *    driver scan table either as an update to an existing entry
1588          *    or as an addition at the end of the table
1589          */
1590         for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) {
1591                 struct bss_descriptor new;
1592                 struct bss_descriptor * found = NULL;
1593                 struct bss_descriptor * oldest = NULL;
1594                 DECLARE_MAC_BUF(mac);
1595
1596                 /* Process the data fields and IEs returned for this BSS */
1597                 memset(&new, 0, sizeof (struct bss_descriptor));
1598                 if (lbs_process_bss(&new, &pbssinfo, &bytesleft) != 0) {
1599                         /* error parsing the scan response, skipped */
1600                         lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1601                         continue;
1602                 }
1603
1604                 /* Try to find this bss in the scan table */
1605                 list_for_each_entry (iter_bss, &priv->network_list, list) {
1606                         if (is_same_network(iter_bss, &new)) {
1607                                 found = iter_bss;
1608                                 break;
1609                         }
1610
1611                         if ((oldest == NULL) ||
1612                             (iter_bss->last_scanned < oldest->last_scanned))
1613                                 oldest = iter_bss;
1614                 }
1615
1616                 if (found) {
1617                         /* found, clear it */
1618                         clear_bss_descriptor(found);
1619                 } else if (!list_empty(&priv->network_free_list)) {
1620                         /* Pull one from the free list */
1621                         found = list_entry(priv->network_free_list.next,
1622                                            struct bss_descriptor, list);
1623                         list_move_tail(&found->list, &priv->network_list);
1624                 } else if (oldest) {
1625                         /* If there are no more slots, expire the oldest */
1626                         found = oldest;
1627                         clear_bss_descriptor(found);
1628                         list_move_tail(&found->list, &priv->network_list);
1629                 } else {
1630                         continue;
1631                 }
1632
1633                 lbs_deb_scan("SCAN_RESP: BSSID %s\n",
1634                              print_mac(mac, new.bssid));
1635
1636                 /* Copy the locally created newbssentry to the scan table */
1637                 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1638         }
1639
1640         ret = 0;
1641
1642 done:
1643         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1644         return ret;
1645 }