drivers/net/wireless/mwifiex/scan.c

   1 /*
   2  * Marvell Wireless LAN device driver: scan ioctl and command handling
   3  *
   4  * Copyright (C) 2011, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "decl.h"
  21 #include "ioctl.h"
  22 #include "util.h"
  23 #include "fw.h"
  24 #include "main.h"
  25 #include "11n.h"
  26 #include "cfg80211.h"
  27
  28 /* The maximum number of channels the firmware can scan per command */
  29 #define MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN   14
  30
  31 #define MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD       4
  32 #define MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD    15
  33 #define MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD   27
  34 #define MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD   35
  35
  36 /* Memory needed to store a max sized Channel List TLV for a firmware scan */
  37 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mwifiex_ie_types_header)         \
  38                                 + (MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN     \
  39                                 *sizeof(struct mwifiex_chan_scan_param_set)))
  40
  41 /* Memory needed to store supported rate */
  42 #define RATE_TLV_MAX_SIZE   (sizeof(struct mwifiex_ie_types_rates_param_set) \
  43                                 + HOSTCMD_SUPPORTED_RATES)
  44
  45 /* Memory needed to store a max number/size WildCard SSID TLV for a firmware
  46         scan */
  47 #define WILDCARD_SSID_TLV_MAX_SIZE  \
  48         (MWIFIEX_MAX_SSID_LIST_LENGTH *                                 \
  49                 (sizeof(struct mwifiex_ie_types_wildcard_ssid_params)   \
  50                         + IEEE80211_MAX_SSID_LEN))
  51
  52 /* Maximum memory needed for a mwifiex_scan_cmd_config with all TLVs at max */
  53 #define MAX_SCAN_CFG_ALLOC (sizeof(struct mwifiex_scan_cmd_config)        \
  54                                 + sizeof(struct mwifiex_ie_types_num_probes)   \
  55                                 + sizeof(struct mwifiex_ie_types_htcap)       \
  56                                 + CHAN_TLV_MAX_SIZE                 \
  57                                 + RATE_TLV_MAX_SIZE                 \
  58                                 + WILDCARD_SSID_TLV_MAX_SIZE)
  59
  60
  61 union mwifiex_scan_cmd_config_tlv {
  62         /* Scan configuration (variable length) */
  63         struct mwifiex_scan_cmd_config config;
  64         /* Max allocated block */
  65         u8 config_alloc_buf[MAX_SCAN_CFG_ALLOC];
  66 };
  67
  68 enum cipher_suite {
  69         CIPHER_SUITE_TKIP,
  70         CIPHER_SUITE_CCMP,
  71         CIPHER_SUITE_MAX
  72 };
  73 static u8 mwifiex_wpa_oui[CIPHER_SUITE_MAX][4] = {
  74         { 0x00, 0x50, 0xf2, 0x02 },     /* TKIP */
  75         { 0x00, 0x50, 0xf2, 0x04 },     /* AES  */
  76 };
  77 static u8 mwifiex_rsn_oui[CIPHER_SUITE_MAX][4] = {
  78         { 0x00, 0x0f, 0xac, 0x02 },     /* TKIP */
  79         { 0x00, 0x0f, 0xac, 0x04 },     /* AES  */
  80 };
  81
  82 /*
  83  * This function parses a given IE for a given OUI.
  84  *
  85  * This is used to parse a WPA/RSN IE to find if it has
  86  * a given oui in PTK.
  87  */
  88 static u8
  89 mwifiex_search_oui_in_ie(struct ie_body *iebody, u8 *oui)
  90 {
  91         u8 count;
  92
  93         count = iebody->ptk_cnt[0];
  94
  95         /* There could be multiple OUIs for PTK hence
  96            1) Take the length.
  97            2) Check all the OUIs for AES.
  98            3) If one of them is AES then pass success. */
  99         while (count) {
 100                 if (!memcmp(iebody->ptk_body, oui, sizeof(iebody->ptk_body)))
 101                         return MWIFIEX_OUI_PRESENT;
 102
 103                 --count;
 104                 if (count)
 105                         iebody = (struct ie_body *) ((u8 *) iebody +
 106                                                 sizeof(iebody->ptk_body));
 107         }
 108
 109         pr_debug("info: %s: OUI is not found in PTK\n", __func__);
 110         return MWIFIEX_OUI_NOT_PRESENT;
 111 }
 112
 113 /*
 114  * This function checks if a given OUI is present in a RSN IE.
 115  *
 116  * The function first checks if a RSN IE is present or not in the
 117  * BSS descriptor. It tries to locate the OUI only if such an IE is
 118  * present.
 119  */
 120 static u8
 121 mwifiex_is_rsn_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 122 {
 123         u8 *oui;
 124         struct ie_body *iebody;
 125         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 126
 127         if (((bss_desc->bcn_rsn_ie) && ((*(bss_desc->bcn_rsn_ie)).
 128                                         ieee_hdr.element_id == WLAN_EID_RSN))) {
 129                 iebody = (struct ie_body *)
 130                          (((u8 *) bss_desc->bcn_rsn_ie->data) +
 131                           RSN_GTK_OUI_OFFSET);
 132                 oui = &mwifiex_rsn_oui[cipher][0];
 133                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 134                 if (ret)
 135                         return ret;
 136         }
 137         return ret;
 138 }
 139
 140 /*
 141  * This function checks if a given OUI is present in a WPA IE.
 142  *
 143  * The function first checks if a WPA IE is present or not in the
 144  * BSS descriptor. It tries to locate the OUI only if such an IE is
 145  * present.
 146  */
 147 static u8
 148 mwifiex_is_wpa_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 149 {
 150         u8 *oui;
 151         struct ie_body *iebody;
 152         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 153
 154         if (((bss_desc->bcn_wpa_ie) &&
 155              ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id ==
 156               WLAN_EID_WPA))) {
 157                 iebody = (struct ie_body *) bss_desc->bcn_wpa_ie->data;
 158                 oui = &mwifiex_wpa_oui[cipher][0];
 159                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 160                 if (ret)
 161                         return ret;
 162         }
 163         return ret;
 164 }
 165
 166 /*
 167  * This function compares two SSIDs and checks if they match.
 168  */
 169 s32
 170 mwifiex_ssid_cmp(struct cfg80211_ssid *ssid1, struct cfg80211_ssid *ssid2)
 171 {
 172         if (!ssid1 || !ssid2 || (ssid1->ssid_len != ssid2->ssid_len))
 173                 return -1;
 174         return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssid_len);
 175 }
 176
 177 /*
 178  * This function checks if wapi is enabled in driver and scanned network is
 179  * compatible with it.
 180  */
 181 static bool
 182 mwifiex_is_bss_wapi(struct mwifiex_private *priv,
 183                     struct mwifiex_bssdescriptor *bss_desc)
 184 {
 185         if (priv->sec_info.wapi_enabled &&
 186             (bss_desc->bcn_wapi_ie &&
 187              ((*(bss_desc->bcn_wapi_ie)).ieee_hdr.element_id ==
 188                         WLAN_EID_BSS_AC_ACCESS_DELAY))) {
 189                 return true;
 190         }
 191         return false;
 192 }
 193
 194 /*
 195  * This function checks if driver is configured with no security mode and
 196  * scanned network is compatible with it.
 197  */
 198 static bool
 199 mwifiex_is_bss_no_sec(struct mwifiex_private *priv,
 200                       struct mwifiex_bssdescriptor *bss_desc)
 201 {
 202         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 203             !priv->sec_info.wpa2_enabled && ((!bss_desc->bcn_wpa_ie) ||
 204                 ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id !=
 205                  WLAN_EID_WPA)) &&
 206             ((!bss_desc->bcn_rsn_ie) ||
 207                 ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id !=
 208                  WLAN_EID_RSN)) &&
 209             !priv->sec_info.encryption_mode && !bss_desc->privacy) {
 210                 return true;
 211         }
 212         return false;
 213 }
 214
 215 /*
 216  * This function checks if static WEP is enabled in driver and scanned network
 217  * is compatible with it.
 218  */
 219 static bool
 220 mwifiex_is_bss_static_wep(struct mwifiex_private *priv,
 221                           struct mwifiex_bssdescriptor *bss_desc)
 222 {
 223         if (priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 224             !priv->sec_info.wpa2_enabled && bss_desc->privacy) {
 225                 return true;
 226         }
 227         return false;
 228 }
 229
 230 /*
 231  * This function checks if wpa is enabled in driver and scanned network is
 232  * compatible with it.
 233  */
 234 static bool
 235 mwifiex_is_bss_wpa(struct mwifiex_private *priv,
 236                    struct mwifiex_bssdescriptor *bss_desc)
 237 {
 238         if (!priv->sec_info.wep_enabled && priv->sec_info.wpa_enabled &&
 239             !priv->sec_info.wpa2_enabled && ((bss_desc->bcn_wpa_ie) &&
 240             ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id == WLAN_EID_WPA))
 241            /*
 242             * Privacy bit may NOT be set in some APs like
 243             * LinkSys WRT54G && bss_desc->privacy
 244             */
 245          ) {
 246                 dev_dbg(priv->adapter->dev, "info: %s: WPA:"
 247                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 248                         "EncMode=%#x privacy=%#x\n", __func__,
 249                         (bss_desc->bcn_wpa_ie) ?
 250                         (*(bss_desc->bcn_wpa_ie)).
 251                         vend_hdr.element_id : 0,
 252                         (bss_desc->bcn_rsn_ie) ?
 253                         (*(bss_desc->bcn_rsn_ie)).
 254                         ieee_hdr.element_id : 0,
 255                         (priv->sec_info.wep_enabled) ? "e" : "d",
 256                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 257                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 258                         priv->sec_info.encryption_mode,
 259                         bss_desc->privacy);
 260                 return true;
 261         }
 262         return false;
 263 }
 264
 265 /*
 266  * This function checks if wpa2 is enabled in driver and scanned network is
 267  * compatible with it.
 268  */
 269 static bool
 270 mwifiex_is_bss_wpa2(struct mwifiex_private *priv,
 271                     struct mwifiex_bssdescriptor *bss_desc)
 272 {
 273         if (!priv->sec_info.wep_enabled &&
 274             !priv->sec_info.wpa_enabled &&
 275             priv->sec_info.wpa2_enabled &&
 276             ((bss_desc->bcn_rsn_ie) &&
 277              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id == WLAN_EID_RSN))) {
 278                 /*
 279                  * Privacy bit may NOT be set in some APs like
 280                  * LinkSys WRT54G && bss_desc->privacy
 281                  */
 282                 dev_dbg(priv->adapter->dev, "info: %s: WPA2: "
 283                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 284                         "EncMode=%#x privacy=%#x\n", __func__,
 285                         (bss_desc->bcn_wpa_ie) ?
 286                         (*(bss_desc->bcn_wpa_ie)).
 287                         vend_hdr.element_id : 0,
 288                         (bss_desc->bcn_rsn_ie) ?
 289                         (*(bss_desc->bcn_rsn_ie)).
 290                         ieee_hdr.element_id : 0,
 291                         (priv->sec_info.wep_enabled) ? "e" : "d",
 292                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 293                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 294                         priv->sec_info.encryption_mode,
 295                         bss_desc->privacy);
 296                 return true;
 297         }
 298         return false;
 299 }
 300
 301 /*
 302  * This function checks if adhoc AES is enabled in driver and scanned network is
 303  * compatible with it.
 304  */
 305 static bool
 306 mwifiex_is_bss_adhoc_aes(struct mwifiex_private *priv,
 307                          struct mwifiex_bssdescriptor *bss_desc)
 308 {
 309         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 310             !priv->sec_info.wpa2_enabled &&
 311             ((!bss_desc->bcn_wpa_ie) ||
 312              ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id != WLAN_EID_WPA)) &&
 313             ((!bss_desc->bcn_rsn_ie) ||
 314              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
 315             !priv->sec_info.encryption_mode && bss_desc->privacy) {
 316                 return true;
 317         }
 318         return false;
 319 }
 320
 321 /*
 322  * This function checks if dynamic WEP is enabled in driver and scanned network
 323  * is compatible with it.
 324  */
 325 static bool
 326 mwifiex_is_bss_dynamic_wep(struct mwifiex_private *priv,
 327                            struct mwifiex_bssdescriptor *bss_desc)
 328 {
 329         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 330             !priv->sec_info.wpa2_enabled &&
 331             ((!bss_desc->bcn_wpa_ie) ||
 332              ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id != WLAN_EID_WPA)) &&
 333             ((!bss_desc->bcn_rsn_ie) ||
 334              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
 335             priv->sec_info.encryption_mode && bss_desc->privacy) {
 336                 dev_dbg(priv->adapter->dev, "info: %s: dynamic "
 337                         "WEP: wpa_ie=%#x wpa2_ie=%#x "
 338                         "EncMode=%#x privacy=%#x\n",
 339                         __func__,
 340                         (bss_desc->bcn_wpa_ie) ?
 341                         (*(bss_desc->bcn_wpa_ie)).
 342                         vend_hdr.element_id : 0,
 343                         (bss_desc->bcn_rsn_ie) ?
 344                         (*(bss_desc->bcn_rsn_ie)).
 345                         ieee_hdr.element_id : 0,
 346                         priv->sec_info.encryption_mode,
 347                         bss_desc->privacy);
 348                 return true;
 349         }
 350         return false;
 351 }
 352
 353 /*
 354  * This function checks if a scanned network is compatible with the driver
 355  * settings.
 356  *
 357  *   WEP     WPA    WPA2   ad-hoc encrypt                  Network
 358  * enabled enabled enabled  AES    mode   Privacy WPA WPA2 Compatible
 359  *    0       0       0      0     NONE      0     0   0   yes No security
 360  *    0       1       0      0      x        1x    1   x   yes WPA (disable
 361  *                                                         HT if no AES)
 362  *    0       0       1      0      x        1x    x   1   yes WPA2 (disable
 363  *                                                         HT if no AES)
 364  *    0       0       0      1     NONE      1     0   0   yes Ad-hoc AES
 365  *    1       0       0      0     NONE      1     0   0   yes Static WEP
 366  *                                                         (disable HT)
 367  *    0       0       0      0    !=NONE     1     0   0   yes Dynamic WEP
 368  *
 369  * Compatibility is not matched while roaming, except for mode.
 370  */
 371 static s32
 372 mwifiex_is_network_compatible(struct mwifiex_private *priv,
 373                               struct mwifiex_bssdescriptor *bss_desc, u32 mode)
 374 {
 375         struct mwifiex_adapter *adapter = priv->adapter;
 376
 377         bss_desc->disable_11n = false;
 378
 379         /* Don't check for compatibility if roaming */
 380         if (priv->media_connected &&
 381             (priv->bss_mode == NL80211_IFTYPE_STATION) &&
 382             (bss_desc->bss_mode == NL80211_IFTYPE_STATION))
 383                 return 0;
 384
 385         if (priv->wps.session_enable) {
 386                 dev_dbg(adapter->dev,
 387                         "info: return success directly in WPS period\n");
 388                 return 0;
 389         }
 390
 391         if (mwifiex_is_bss_wapi(priv, bss_desc)) {
 392                 dev_dbg(adapter->dev, "info: return success for WAPI AP\n");
 393                 return 0;
 394         }
 395
 396         if (bss_desc->bss_mode == mode) {
 397                 if (mwifiex_is_bss_no_sec(priv, bss_desc)) {
 398                         /* No security */
 399                         return 0;
 400                 } else if (mwifiex_is_bss_static_wep(priv, bss_desc)) {
 401                         /* Static WEP enabled */
 402                         dev_dbg(adapter->dev, "info: Disable 11n in WEP mode.\n");
 403                         bss_desc->disable_11n = true;
 404                         return 0;
 405                 } else if (mwifiex_is_bss_wpa(priv, bss_desc)) {
 406                         /* WPA enabled */
 407                         if (((priv->adapter->config_bands & BAND_GN ||
 408                               priv->adapter->config_bands & BAND_AN) &&
 409                              bss_desc->bcn_ht_cap) &&
 410                             !mwifiex_is_wpa_oui_present(bss_desc,
 411                                                          CIPHER_SUITE_CCMP)) {
 412
 413                                 if (mwifiex_is_wpa_oui_present
 414                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 415                                         dev_dbg(adapter->dev,
 416                                                 "info: Disable 11n if AES "
 417                                                 "is not supported by AP\n");
 418                                         bss_desc->disable_11n = true;
 419                                 } else {
 420                                         return -1;
 421                                 }
 422                         }
 423                         return 0;
 424                 } else if (mwifiex_is_bss_wpa2(priv, bss_desc)) {
 425                         /* WPA2 enabled */
 426                         if (((priv->adapter->config_bands & BAND_GN ||
 427                               priv->adapter->config_bands & BAND_AN) &&
 428                              bss_desc->bcn_ht_cap) &&
 429                             !mwifiex_is_rsn_oui_present(bss_desc,
 430                                                         CIPHER_SUITE_CCMP)) {
 431
 432                                 if (mwifiex_is_rsn_oui_present
 433                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 434                                         dev_dbg(adapter->dev,
 435                                                 "info: Disable 11n if AES "
 436                                                 "is not supported by AP\n");
 437                                         bss_desc->disable_11n = true;
 438                                 } else {
 439                                         return -1;
 440                                 }
 441                         }
 442                         return 0;
 443                 } else if (mwifiex_is_bss_adhoc_aes(priv, bss_desc)) {
 444                         /* Ad-hoc AES enabled */
 445                         return 0;
 446                 } else if (mwifiex_is_bss_dynamic_wep(priv, bss_desc)) {
 447                         /* Dynamic WEP enabled */
 448                         return 0;
 449                 }
 450
 451                 /* Security doesn't match */
 452                 dev_dbg(adapter->dev,
 453                         "info: %s: failed: wpa_ie=%#x wpa2_ie=%#x WEP=%s "
 454                         "WPA=%s WPA2=%s EncMode=%#x privacy=%#x\n", __func__,
 455                         (bss_desc->bcn_wpa_ie) ?
 456                         (*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id : 0,
 457                         (bss_desc->bcn_rsn_ie) ?
 458                         (*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id : 0,
 459                         (priv->sec_info.wep_enabled) ? "e" : "d",
 460                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 461                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 462                         priv->sec_info.encryption_mode, bss_desc->privacy);
 463                 return -1;
 464         }
 465
 466         /* Mode doesn't match */
 467         return -1;
 468 }
 469
 470 /*
 471  * This function creates a channel list for the driver to scan, based
 472  * on region/band information.
 473  *
 474  * This routine is used for any scan that is not provided with a
 475  * specific channel list to scan.
 476  */
 477 static int
 478 mwifiex_scan_create_channel_list(struct mwifiex_private *priv,
 479                                  const struct mwifiex_user_scan_cfg
 480                                                         *user_scan_in,
 481                                  struct mwifiex_chan_scan_param_set
 482                                                         *scan_chan_list,
 483                                  u8 filtered_scan)
 484 {
 485         enum ieee80211_band band;
 486         struct ieee80211_supported_band *sband;
 487         struct ieee80211_channel *ch;
 488         struct mwifiex_adapter *adapter = priv->adapter;
 489         int chan_idx = 0, i;
 490
 491         for (band = 0; (band < IEEE80211_NUM_BANDS) ; band++) {
 492
 493                 if (!priv->wdev->wiphy->bands[band])
 494                         continue;
 495
 496                 sband = priv->wdev->wiphy->bands[band];
 497
 498                 for (i = 0; (i < sband->n_channels) ; i++) {
 499                         ch = &sband->channels[i];
 500                         if (ch->flags & IEEE80211_CHAN_DISABLED)
 501                                 continue;
 502                         scan_chan_list[chan_idx].radio_type = band;
 503
 504                         if (user_scan_in &&
 505                             user_scan_in->chan_list[0].scan_time)
 506                                 scan_chan_list[chan_idx].max_scan_time =
 507                                         cpu_to_le16((u16) user_scan_in->
 508                                         chan_list[0].scan_time);
 509                         else if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 510                                 scan_chan_list[chan_idx].max_scan_time =
 511                                         cpu_to_le16(adapter->passive_scan_time);
 512                         else
 513                                 scan_chan_list[chan_idx].max_scan_time =
 514                                         cpu_to_le16(adapter->active_scan_time);
 515
 516                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 517                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 518                                         |= MWIFIEX_PASSIVE_SCAN;
 519                         else
 520                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 521                                         &= ~MWIFIEX_PASSIVE_SCAN;
 522                         scan_chan_list[chan_idx].chan_number =
 523                                                         (u32) ch->hw_value;
 524                         if (filtered_scan) {
 525                                 scan_chan_list[chan_idx].max_scan_time =
 526                                 cpu_to_le16(adapter->specific_scan_time);
 527                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 528                                         |= MWIFIEX_DISABLE_CHAN_FILT;
 529                         }
 530                         chan_idx++;
 531                 }
 532
 533         }
 534         return chan_idx;
 535 }
 536
 537 /*
 538  * This function constructs and sends multiple scan config commands to
 539  * the firmware.
 540  *
 541  * Previous routines in the code flow have created a scan command configuration
 542  * with any requested TLVs.  This function splits the channel TLV into maximum
 543  * channels supported per scan lists and sends the portion of the channel TLV,
 544  * along with the other TLVs, to the firmware.
 545  */
 546 static int
 547 mwifiex_scan_channel_list(struct mwifiex_private *priv,
 548                           u32 max_chan_per_scan, u8 filtered_scan,
 549                           struct mwifiex_scan_cmd_config *scan_cfg_out,
 550                           struct mwifiex_ie_types_chan_list_param_set
 551                           *chan_tlv_out,
 552                           struct mwifiex_chan_scan_param_set *scan_chan_list)
 553 {
 554         int ret = 0;
 555         struct mwifiex_chan_scan_param_set *tmp_chan_list;
 556         struct mwifiex_chan_scan_param_set *start_chan;
 557
 558         u32 tlv_idx;
 559         u32 total_scan_time;
 560         u32 done_early;
 561
 562         if (!scan_cfg_out || !chan_tlv_out || !scan_chan_list) {
 563                 dev_dbg(priv->adapter->dev,
 564                         "info: Scan: Null detect: %p, %p, %p\n",
 565                        scan_cfg_out, chan_tlv_out, scan_chan_list);
 566                 return -1;
 567         }
 568
 569         chan_tlv_out->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 570
 571         /* Set the temp channel struct pointer to the start of the desired
 572            list */
 573         tmp_chan_list = scan_chan_list;
 574
 575         /* Loop through the desired channel list, sending a new firmware scan
 576            commands for each max_chan_per_scan channels (or for 1,6,11
 577            individually if configured accordingly) */
 578         while (tmp_chan_list->chan_number) {
 579
 580                 tlv_idx = 0;
 581                 total_scan_time = 0;
 582                 chan_tlv_out->header.len = 0;
 583                 start_chan = tmp_chan_list;
 584                 done_early = false;
 585
 586                 /*
 587                  * Construct the Channel TLV for the scan command.  Continue to
 588                  * insert channel TLVs until:
 589                  *   - the tlv_idx hits the maximum configured per scan command
 590                  *   - the next channel to insert is 0 (end of desired channel
 591                  *     list)
 592                  *   - done_early is set (controlling individual scanning of
 593                  *     1,6,11)
 594                  */
 595                 while (tlv_idx < max_chan_per_scan &&
 596                        tmp_chan_list->chan_number && !done_early) {
 597
 598                         dev_dbg(priv->adapter->dev,
 599                                 "info: Scan: Chan(%3d), Radio(%d),"
 600                                 " Mode(%d, %d), Dur(%d)\n",
 601                                 tmp_chan_list->chan_number,
 602                                 tmp_chan_list->radio_type,
 603                                 tmp_chan_list->chan_scan_mode_bitmap
 604                                 & MWIFIEX_PASSIVE_SCAN,
 605                                 (tmp_chan_list->chan_scan_mode_bitmap
 606                                  & MWIFIEX_DISABLE_CHAN_FILT) >> 1,
 607                                 le16_to_cpu(tmp_chan_list->max_scan_time));
 608
 609                         /* Copy the current channel TLV to the command being
 610                            prepared */
 611                         memcpy(chan_tlv_out->chan_scan_param + tlv_idx,
 612                                tmp_chan_list,
 613                                sizeof(chan_tlv_out->chan_scan_param));
 614
 615                         /* Increment the TLV header length by the size
 616                            appended */
 617                         chan_tlv_out->header.len =
 618                         cpu_to_le16(le16_to_cpu(chan_tlv_out->header.len) +
 619                         (sizeof(chan_tlv_out->chan_scan_param)));
 620
 621                         /*
 622                          * The tlv buffer length is set to the number of bytes
 623                          * of the between the channel tlv pointer and the start
 624                          * of the tlv buffer.  This compensates for any TLVs
 625                          * that were appended before the channel list.
 626                          */
 627                         scan_cfg_out->tlv_buf_len = (u32) ((u8 *) chan_tlv_out -
 628                                                         scan_cfg_out->tlv_buf);
 629
 630                         /* Add the size of the channel tlv header and the data
 631                            length */
 632                         scan_cfg_out->tlv_buf_len +=
 633                                 (sizeof(chan_tlv_out->header)
 634                                  + le16_to_cpu(chan_tlv_out->header.len));
 635
 636                         /* Increment the index to the channel tlv we are
 637                            constructing */
 638                         tlv_idx++;
 639
 640                         /* Count the total scan time per command */
 641                         total_scan_time +=
 642                                 le16_to_cpu(tmp_chan_list->max_scan_time);
 643
 644                         done_early = false;
 645
 646                         /* Stop the loop if the *current* channel is in the
 647                            1,6,11 set and we are not filtering on a BSSID
 648                            or SSID. */
 649                         if (!filtered_scan &&
 650                             (tmp_chan_list->chan_number == 1 ||
 651                              tmp_chan_list->chan_number == 6 ||
 652                              tmp_chan_list->chan_number == 11))
 653                                 done_early = true;
 654
 655                         /* Increment the tmp pointer to the next channel to
 656                            be scanned */
 657                         tmp_chan_list++;
 658
 659                         /* Stop the loop if the *next* channel is in the 1,6,11
 660                            set.  This will cause it to be the only channel
 661                            scanned on the next interation */
 662                         if (!filtered_scan &&
 663                             (tmp_chan_list->chan_number == 1 ||
 664                              tmp_chan_list->chan_number == 6 ||
 665                              tmp_chan_list->chan_number == 11))
 666                                 done_early = true;
 667                 }
 668
 669                 /* The total scan time should be less than scan command timeout
 670                    value */
 671                 if (total_scan_time > MWIFIEX_MAX_TOTAL_SCAN_TIME) {
 672                         dev_err(priv->adapter->dev, "total scan time %dms"
 673                                 " is over limit (%dms), scan skipped\n",
 674                                 total_scan_time, MWIFIEX_MAX_TOTAL_SCAN_TIME);
 675                         ret = -1;
 676                         break;
 677                 }
 678
 679                 priv->adapter->scan_channels = start_chan;
 680
 681                 /* Send the scan command to the firmware with the specified
 682                    cfg */
 683                 ret = mwifiex_send_cmd_async(priv, HostCmd_CMD_802_11_SCAN,
 684                                              HostCmd_ACT_GEN_SET, 0,
 685                                              scan_cfg_out);
 686                 if (ret)
 687                         break;
 688         }
 689
 690         if (ret)
 691                 return -1;
 692
 693         return 0;
 694 }
 695
 696 /*
 697  * This function constructs a scan command configuration structure to use
 698  * in scan commands.
 699  *
 700  * Application layer or other functions can invoke network scanning
 701  * with a scan configuration supplied in a user scan configuration structure.
 702  * This structure is used as the basis of one or many scan command configuration
 703  * commands that are sent to the command processing module and eventually to the
 704  * firmware.
 705  *
 706  * This function creates a scan command configuration structure  based on the
 707  * following user supplied parameters (if present):
 708  *      - SSID filter
 709  *      - BSSID filter
 710  *      - Number of Probes to be sent
 711  *      - Channel list
 712  *
 713  * If the SSID or BSSID filter is not present, the filter is disabled/cleared.
 714  * If the number of probes is not set, adapter default setting is used.
 715  */
 716 static void
 717 mwifiex_config_scan(struct mwifiex_private *priv,
 718                     const struct mwifiex_user_scan_cfg *user_scan_in,
 719                     struct mwifiex_scan_cmd_config *scan_cfg_out,
 720                     struct mwifiex_ie_types_chan_list_param_set **chan_list_out,
 721                     struct mwifiex_chan_scan_param_set *scan_chan_list,
 722                     u8 *max_chan_per_scan, u8 *filtered_scan,
 723                     u8 *scan_current_only)
 724 {
 725         struct mwifiex_adapter *adapter = priv->adapter;
 726         struct mwifiex_ie_types_num_probes *num_probes_tlv;
 727         struct mwifiex_ie_types_wildcard_ssid_params *wildcard_ssid_tlv;
 728         struct mwifiex_ie_types_rates_param_set *rates_tlv;
 729         const u8 zero_mac[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
 730         u8 *tlv_pos;
 731         u32 num_probes;
 732         u32 ssid_len;
 733         u32 chan_idx;
 734         u32 chan_num;
 735         u32 scan_type;
 736         u16 scan_dur;
 737         u8 channel;
 738         u8 radio_type;
 739         int i;
 740         u8 ssid_filter;
 741         u8 rates[MWIFIEX_SUPPORTED_RATES];
 742         u32 rates_size;
 743         struct mwifiex_ie_types_htcap *ht_cap;
 744
 745         /* The tlv_buf_len is calculated for each scan command.  The TLVs added
 746            in this routine will be preserved since the routine that sends the
 747            command will append channelTLVs at *chan_list_out.  The difference
 748            between the *chan_list_out and the tlv_buf start will be used to
 749            calculate the size of anything we add in this routine. */
 750         scan_cfg_out->tlv_buf_len = 0;
 751
 752         /* Running tlv pointer.  Assigned to chan_list_out at end of function
 753            so later routines know where channels can be added to the command
 754            buf */
 755         tlv_pos = scan_cfg_out->tlv_buf;
 756
 757         /* Initialize the scan as un-filtered; the flag is later set to TRUE
 758            below if a SSID or BSSID filter is sent in the command */
 759         *filtered_scan = false;
 760
 761         /* Initialize the scan as not being only on the current channel.  If
 762            the channel list is customized, only contains one channel, and is
 763            the active channel, this is set true and data flow is not halted. */
 764         *scan_current_only = false;
 765
 766         if (user_scan_in) {
 767
 768                 /* Default the ssid_filter flag to TRUE, set false under
 769                    certain wildcard conditions and qualified by the existence
 770                    of an SSID list before marking the scan as filtered */
 771                 ssid_filter = true;
 772
 773                 /* Set the BSS type scan filter, use Adapter setting if
 774                    unset */
 775                 scan_cfg_out->bss_mode =
 776                         (user_scan_in->bss_mode ? (u8) user_scan_in->
 777                          bss_mode : (u8) adapter->scan_mode);
 778
 779                 /* Set the number of probes to send, use Adapter setting
 780                    if unset */
 781                 num_probes =
 782                         (user_scan_in->num_probes ? user_scan_in->
 783                          num_probes : adapter->scan_probes);
 784
 785                 /*
 786                  * Set the BSSID filter to the incoming configuration,
 787                  * if non-zero.  If not set, it will remain disabled
 788                  * (all zeros).
 789                  */
 790                 memcpy(scan_cfg_out->specific_bssid,
 791                        user_scan_in->specific_bssid,
 792                        sizeof(scan_cfg_out->specific_bssid));
 793
 794                 for (i = 0; i < user_scan_in->num_ssids; i++) {
 795                         ssid_len = user_scan_in->ssid_list[i].ssid_len;
 796
 797                         wildcard_ssid_tlv =
 798                                 (struct mwifiex_ie_types_wildcard_ssid_params *)
 799                                 tlv_pos;
 800                         wildcard_ssid_tlv->header.type =
 801                                 cpu_to_le16(TLV_TYPE_WILDCARDSSID);
 802                         wildcard_ssid_tlv->header.len = cpu_to_le16(
 803                                 (u16) (ssid_len + sizeof(wildcard_ssid_tlv->
 804                                                          max_ssid_length)));
 805
 806                         /*
 807                          * max_ssid_length = 0 tells firmware to perform
 808                          * specific scan for the SSID filled, whereas
 809                          * max_ssid_length = IEEE80211_MAX_SSID_LEN is for
 810                          * wildcard scan.
 811                          */
 812                         if (ssid_len)
 813                                 wildcard_ssid_tlv->max_ssid_length = 0;
 814                         else
 815                                 wildcard_ssid_tlv->max_ssid_length =
 816                                                         IEEE80211_MAX_SSID_LEN;
 817
 818                         memcpy(wildcard_ssid_tlv->ssid,
 819                                user_scan_in->ssid_list[i].ssid, ssid_len);
 820
 821                         tlv_pos += (sizeof(wildcard_ssid_tlv->header)
 822                                 + le16_to_cpu(wildcard_ssid_tlv->header.len));
 823
 824                         dev_dbg(adapter->dev, "info: scan: ssid[%d]: %s, %d\n",
 825                                 i, wildcard_ssid_tlv->ssid,
 826                                 wildcard_ssid_tlv->max_ssid_length);
 827
 828                         /* Empty wildcard ssid with a maxlen will match many or
 829                            potentially all SSIDs (maxlen == 32), therefore do
 830                            not treat the scan as
 831                            filtered. */
 832                         if (!ssid_len && wildcard_ssid_tlv->max_ssid_length)
 833                                 ssid_filter = false;
 834                 }
 835
 836                 /*
 837                  *  The default number of channels sent in the command is low to
 838                  *  ensure the response buffer from the firmware does not
 839                  *  truncate scan results.  That is not an issue with an SSID
 840                  *  or BSSID filter applied to the scan results in the firmware.
 841                  */
 842                 if ((i && ssid_filter) ||
 843                     memcmp(scan_cfg_out->specific_bssid, &zero_mac,
 844                            sizeof(zero_mac)))
 845                         *filtered_scan = true;
 846         } else {
 847                 scan_cfg_out->bss_mode = (u8) adapter->scan_mode;
 848                 num_probes = adapter->scan_probes;
 849         }
 850
 851         /*
 852          *  If a specific BSSID or SSID is used, the number of channels in the
 853          *  scan command will be increased to the absolute maximum.
 854          */
 855         if (*filtered_scan)
 856                 *max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
 857         else
 858                 *max_chan_per_scan = MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD;
 859
 860         /* If the input config or adapter has the number of Probes set,
 861            add tlv */
 862         if (num_probes) {
 863
 864                 dev_dbg(adapter->dev, "info: scan: num_probes = %d\n",
 865                         num_probes);
 866
 867                 num_probes_tlv = (struct mwifiex_ie_types_num_probes *) tlv_pos;
 868                 num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 869                 num_probes_tlv->header.len =
 870                         cpu_to_le16(sizeof(num_probes_tlv->num_probes));
 871                 num_probes_tlv->num_probes = cpu_to_le16((u16) num_probes);
 872
 873                 tlv_pos += sizeof(num_probes_tlv->header) +
 874                         le16_to_cpu(num_probes_tlv->header.len);
 875
 876         }
 877
 878         /* Append rates tlv */
 879         memset(rates, 0, sizeof(rates));
 880
 881         rates_size = mwifiex_get_supported_rates(priv, rates);
 882
 883         rates_tlv = (struct mwifiex_ie_types_rates_param_set *) tlv_pos;
 884         rates_tlv->header.type = cpu_to_le16(WLAN_EID_SUPP_RATES);
 885         rates_tlv->header.len = cpu_to_le16((u16) rates_size);
 886         memcpy(rates_tlv->rates, rates, rates_size);
 887         tlv_pos += sizeof(rates_tlv->header) + rates_size;
 888
 889         dev_dbg(adapter->dev, "info: SCAN_CMD: Rates size = %d\n", rates_size);
 890
 891         if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info) &&
 892             (priv->adapter->config_bands & BAND_GN ||
 893              priv->adapter->config_bands & BAND_AN)) {
 894                 ht_cap = (struct mwifiex_ie_types_htcap *) tlv_pos;
 895                 memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap));
 896                 ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY);
 897                 ht_cap->header.len =
 898                                 cpu_to_le16(sizeof(struct ieee80211_ht_cap));
 899                 radio_type =
 900                         mwifiex_band_to_radio_type(priv->adapter->config_bands);
 901                 mwifiex_fill_cap_info(priv, radio_type, ht_cap);
 902                 tlv_pos += sizeof(struct mwifiex_ie_types_htcap);
 903         }
 904
 905         /* Append vendor specific IE TLV */
 906         mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_SCAN, &tlv_pos);
 907
 908         /*
 909          * Set the output for the channel TLV to the address in the tlv buffer
 910          *   past any TLVs that were added in this function (SSID, num_probes).
 911          *   Channel TLVs will be added past this for each scan command,
 912          *   preserving the TLVs that were previously added.
 913          */
 914         *chan_list_out =
 915                 (struct mwifiex_ie_types_chan_list_param_set *) tlv_pos;
 916
 917         if (user_scan_in && user_scan_in->chan_list[0].chan_number) {
 918
 919                 dev_dbg(adapter->dev, "info: Scan: Using supplied channel list\n");
 920
 921                 for (chan_idx = 0;
 922                      chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX &&
 923                      user_scan_in->chan_list[chan_idx].chan_number;
 924                      chan_idx++) {
 925
 926                         channel = user_scan_in->chan_list[chan_idx].chan_number;
 927                         (scan_chan_list + chan_idx)->chan_number = channel;
 928
 929                         radio_type =
 930                                 user_scan_in->chan_list[chan_idx].radio_type;
 931                         (scan_chan_list + chan_idx)->radio_type = radio_type;
 932
 933                         scan_type = user_scan_in->chan_list[chan_idx].scan_type;
 934
 935                         if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 936                                 (scan_chan_list +
 937                                  chan_idx)->chan_scan_mode_bitmap
 938                                         |= MWIFIEX_PASSIVE_SCAN;
 939                         else
 940                                 (scan_chan_list +
 941                                  chan_idx)->chan_scan_mode_bitmap
 942                                         &= ~MWIFIEX_PASSIVE_SCAN;
 943
 944                         if (user_scan_in->chan_list[chan_idx].scan_time) {
 945                                 scan_dur = (u16) user_scan_in->
 946                                         chan_list[chan_idx].scan_time;
 947                         } else {
 948                                 if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 949                                         scan_dur = adapter->passive_scan_time;
 950                                 else if (*filtered_scan)
 951                                         scan_dur = adapter->specific_scan_time;
 952                                 else
 953                                         scan_dur = adapter->active_scan_time;
 954                         }
 955
 956                         (scan_chan_list + chan_idx)->min_scan_time =
 957                                 cpu_to_le16(scan_dur);
 958                         (scan_chan_list + chan_idx)->max_scan_time =
 959                                 cpu_to_le16(scan_dur);
 960                 }
 961
 962                 /* Check if we are only scanning the current channel */
 963                 if ((chan_idx == 1) &&
 964                     (user_scan_in->chan_list[0].chan_number ==
 965                      priv->curr_bss_params.bss_descriptor.channel)) {
 966                         *scan_current_only = true;
 967                         dev_dbg(adapter->dev,
 968                                 "info: Scan: Scanning current channel only\n");
 969                 }
 970                 chan_num = chan_idx;
 971         } else {
 972                 dev_dbg(adapter->dev,
 973                         "info: Scan: Creating full region channel list\n");
 974                 chan_num = mwifiex_scan_create_channel_list(priv, user_scan_in,
 975                                                             scan_chan_list,
 976                                                             *filtered_scan);
 977         }
 978
 979         /*
 980          * In associated state we will reduce the number of channels scanned per
 981          * scan command to avoid any traffic delay/loss. This number is decided
 982          * based on total number of channels to be scanned due to constraints
 983          * of command buffers.
 984          */
 985         if (priv->media_connected) {
 986                 if (chan_num < MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD)
 987                         *max_chan_per_scan = 1;
 988                 else if (chan_num < MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD)
 989                         *max_chan_per_scan = 2;
 990                 else if (chan_num < MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD)
 991                         *max_chan_per_scan = 3;
 992         }
 993 }
 994
 995 /*
 996  * This function inspects the scan response buffer for pointers to
 997  * expected TLVs.
 998  *
 999  * TLVs can be included at the end of the scan response BSS information.
1000  *
1001  * Data in the buffer is parsed pointers to TLVs that can potentially
1002  * be passed back in the response.
1003  */
1004 static void
1005 mwifiex_ret_802_11_scan_get_tlv_ptrs(struct mwifiex_adapter *adapter,
1006                                      struct mwifiex_ie_types_data *tlv,
1007                                      u32 tlv_buf_size, u32 req_tlv_type,
1008                                      struct mwifiex_ie_types_data **tlv_data)
1009 {
1010         struct mwifiex_ie_types_data *current_tlv;
1011         u32 tlv_buf_left;
1012         u32 tlv_type;
1013         u32 tlv_len;
1014
1015         current_tlv = tlv;
1016         tlv_buf_left = tlv_buf_size;
1017         *tlv_data = NULL;
1018
1019         dev_dbg(adapter->dev, "info: SCAN_RESP: tlv_buf_size = %d\n",
1020                 tlv_buf_size);
1021
1022         while (tlv_buf_left >= sizeof(struct mwifiex_ie_types_header)) {
1023
1024                 tlv_type = le16_to_cpu(current_tlv->header.type);
1025                 tlv_len = le16_to_cpu(current_tlv->header.len);
1026
1027                 if (sizeof(tlv->header) + tlv_len > tlv_buf_left) {
1028                         dev_err(adapter->dev, "SCAN_RESP: TLV buffer corrupt\n");
1029                         break;
1030                 }
1031
1032                 if (req_tlv_type == tlv_type) {
1033                         switch (tlv_type) {
1034                         case TLV_TYPE_TSFTIMESTAMP:
1035                                 dev_dbg(adapter->dev, "info: SCAN_RESP: TSF "
1036                                         "timestamp TLV, len = %d\n", tlv_len);
1037                                 *tlv_data = current_tlv;
1038                                 break;
1039                         case TLV_TYPE_CHANNELBANDLIST:
1040                                 dev_dbg(adapter->dev, "info: SCAN_RESP: channel"
1041                                         " band list TLV, len = %d\n", tlv_len);
1042                                 *tlv_data = current_tlv;
1043                                 break;
1044                         default:
1045                                 dev_err(adapter->dev,
1046                                         "SCAN_RESP: unhandled TLV = %d\n",
1047                                        tlv_type);
1048                                 /* Give up, this seems corrupted */
1049                                 return;
1050                         }
1051                 }
1052
1053                 if (*tlv_data)
1054                         break;
1055
1056
1057                 tlv_buf_left -= (sizeof(tlv->header) + tlv_len);
1058                 current_tlv =
1059                         (struct mwifiex_ie_types_data *) (current_tlv->data +
1060                                                           tlv_len);
1061
1062         }                       /* while */
1063 }
1064
1065 /*
1066  * This function parses provided beacon buffer and updates
1067  * respective fields in bss descriptor structure.
1068  */
1069 int mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
1070                                     struct mwifiex_bssdescriptor *bss_entry)
1071 {
1072         int ret = 0;
1073         u8 element_id;
1074         struct ieee_types_fh_param_set *fh_param_set;
1075         struct ieee_types_ds_param_set *ds_param_set;
1076         struct ieee_types_cf_param_set *cf_param_set;
1077         struct ieee_types_ibss_param_set *ibss_param_set;
1078         u8 *current_ptr;
1079         u8 *rate;
1080         u8 element_len;
1081         u16 total_ie_len;
1082         u8 bytes_to_copy;
1083         u8 rate_size;
1084         u8 found_data_rate_ie;
1085         u32 bytes_left;
1086         struct ieee_types_vendor_specific *vendor_ie;
1087         const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 };
1088         const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 };
1089
1090         found_data_rate_ie = false;
1091         rate_size = 0;
1092         current_ptr = bss_entry->beacon_buf;
1093         bytes_left = bss_entry->beacon_buf_size;
1094
1095         /* Process variable IE */
1096         while (bytes_left >= 2) {
1097                 element_id = *current_ptr;
1098                 element_len = *(current_ptr + 1);
1099                 total_ie_len = element_len + sizeof(struct ieee_types_header);
1100
1101                 if (bytes_left < total_ie_len) {
1102                         dev_err(adapter->dev, "err: InterpretIE: in processing"
1103                                 " IE, bytes left < IE length\n");
1104                         return -1;
1105                 }
1106                 switch (element_id) {
1107                 case WLAN_EID_SSID:
1108                         bss_entry->ssid.ssid_len = element_len;
1109                         memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
1110                                element_len);
1111                         dev_dbg(adapter->dev,
1112                                 "info: InterpretIE: ssid: %-32s\n",
1113                                 bss_entry->ssid.ssid);
1114                         break;
1115
1116                 case WLAN_EID_SUPP_RATES:
1117                         memcpy(bss_entry->data_rates, current_ptr + 2,
1118                                element_len);
1119                         memcpy(bss_entry->supported_rates, current_ptr + 2,
1120                                element_len);
1121                         rate_size = element_len;
1122                         found_data_rate_ie = true;
1123                         break;
1124
1125                 case WLAN_EID_FH_PARAMS:
1126                         fh_param_set =
1127                                 (struct ieee_types_fh_param_set *) current_ptr;
1128                         memcpy(&bss_entry->phy_param_set.fh_param_set,
1129                                fh_param_set,
1130                                sizeof(struct ieee_types_fh_param_set));
1131                         break;
1132
1133                 case WLAN_EID_DS_PARAMS:
1134                         ds_param_set =
1135                                 (struct ieee_types_ds_param_set *) current_ptr;
1136
1137                         bss_entry->channel = ds_param_set->current_chan;
1138
1139                         memcpy(&bss_entry->phy_param_set.ds_param_set,
1140                                ds_param_set,
1141                                sizeof(struct ieee_types_ds_param_set));
1142                         break;
1143
1144                 case WLAN_EID_CF_PARAMS:
1145                         cf_param_set =
1146                                 (struct ieee_types_cf_param_set *) current_ptr;
1147                         memcpy(&bss_entry->ss_param_set.cf_param_set,
1148                                cf_param_set,
1149                                sizeof(struct ieee_types_cf_param_set));
1150                         break;
1151
1152                 case WLAN_EID_IBSS_PARAMS:
1153                         ibss_param_set =
1154                                 (struct ieee_types_ibss_param_set *)
1155                                 current_ptr;
1156                         memcpy(&bss_entry->ss_param_set.ibss_param_set,
1157                                ibss_param_set,
1158                                sizeof(struct ieee_types_ibss_param_set));
1159                         break;
1160
1161                 case WLAN_EID_ERP_INFO:
1162                         bss_entry->erp_flags = *(current_ptr + 2);
1163                         break;
1164
1165                 case WLAN_EID_EXT_SUPP_RATES:
1166                         /*
1167                          * Only process extended supported rate
1168                          * if data rate is already found.
1169                          * Data rate IE should come before
1170                          * extended supported rate IE
1171                          */
1172                         if (found_data_rate_ie) {
1173                                 if ((element_len + rate_size) >
1174                                     MWIFIEX_SUPPORTED_RATES)
1175                                         bytes_to_copy =
1176                                                 (MWIFIEX_SUPPORTED_RATES -
1177                                                  rate_size);
1178                                 else
1179                                         bytes_to_copy = element_len;
1180
1181                                 rate = (u8 *) bss_entry->data_rates;
1182                                 rate += rate_size;
1183                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1184
1185                                 rate = (u8 *) bss_entry->supported_rates;
1186                                 rate += rate_size;
1187                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1188                         }
1189                         break;
1190
1191                 case WLAN_EID_VENDOR_SPECIFIC:
1192                         vendor_ie = (struct ieee_types_vendor_specific *)
1193                                         current_ptr;
1194
1195                         if (!memcmp
1196                             (vendor_ie->vend_hdr.oui, wpa_oui,
1197                              sizeof(wpa_oui))) {
1198                                 bss_entry->bcn_wpa_ie =
1199                                         (struct ieee_types_vendor_specific *)
1200                                         current_ptr;
1201                                 bss_entry->wpa_offset = (u16)
1202                                         (current_ptr - bss_entry->beacon_buf);
1203                         } else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
1204                                     sizeof(wmm_oui))) {
1205                                 if (total_ie_len ==
1206                                     sizeof(struct ieee_types_wmm_parameter) ||
1207                                     total_ie_len ==
1208                                     sizeof(struct ieee_types_wmm_info))
1209                                         /*
1210                                          * Only accept and copy the WMM IE if
1211                                          * it matches the size expected for the
1212                                          * WMM Info IE or the WMM Parameter IE.
1213                                          */
1214                                         memcpy((u8 *) &bss_entry->wmm_ie,
1215                                                current_ptr, total_ie_len);
1216                         }
1217                         break;
1218                 case WLAN_EID_RSN:
1219                         bss_entry->bcn_rsn_ie =
1220                                 (struct ieee_types_generic *) current_ptr;
1221                         bss_entry->rsn_offset = (u16) (current_ptr -
1222                                                         bss_entry->beacon_buf);
1223                         break;
1224                 case WLAN_EID_BSS_AC_ACCESS_DELAY:
1225                         bss_entry->bcn_wapi_ie =
1226                                 (struct ieee_types_generic *) current_ptr;
1227                         bss_entry->wapi_offset = (u16) (current_ptr -
1228                                                         bss_entry->beacon_buf);
1229                         break;
1230                 case WLAN_EID_HT_CAPABILITY:
1231                         bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *)
1232                                         (current_ptr +
1233                                         sizeof(struct ieee_types_header));
1234                         bss_entry->ht_cap_offset = (u16) (current_ptr +
1235                                         sizeof(struct ieee_types_header) -
1236                                         bss_entry->beacon_buf);
1237                         break;
1238                 case WLAN_EID_HT_OPERATION:
1239                         bss_entry->bcn_ht_oper =
1240                                 (struct ieee80211_ht_operation *)(current_ptr +
1241                                         sizeof(struct ieee_types_header));
1242                         bss_entry->ht_info_offset = (u16) (current_ptr +
1243                                         sizeof(struct ieee_types_header) -
1244                                         bss_entry->beacon_buf);
1245                         break;
1246                 case WLAN_EID_BSS_COEX_2040:
1247                         bss_entry->bcn_bss_co_2040 = current_ptr +
1248                                 sizeof(struct ieee_types_header);
1249                         bss_entry->bss_co_2040_offset = (u16) (current_ptr +
1250                                         sizeof(struct ieee_types_header) -
1251                                                 bss_entry->beacon_buf);
1252                         break;
1253                 case WLAN_EID_EXT_CAPABILITY:
1254                         bss_entry->bcn_ext_cap = current_ptr +
1255                                 sizeof(struct ieee_types_header);
1256                         bss_entry->ext_cap_offset = (u16) (current_ptr +
1257                                         sizeof(struct ieee_types_header) -
1258                                         bss_entry->beacon_buf);
1259                         break;
1260                 default:
1261                         break;
1262                 }
1263
1264                 current_ptr += element_len + 2;
1265
1266                 /* Need to account for IE ID and IE Len */
1267                 bytes_left -= (element_len + 2);
1268
1269         }       /* while (bytes_left > 2) */
1270         return ret;
1271 }
1272
1273 /*
1274  * This function converts radio type scan parameter to a band configuration
1275  * to be used in join command.
1276  */
1277 static u8
1278 mwifiex_radio_type_to_band(u8 radio_type)
1279 {
1280         switch (radio_type) {
1281         case HostCmd_SCAN_RADIO_TYPE_A:
1282                 return BAND_A;
1283         case HostCmd_SCAN_RADIO_TYPE_BG:
1284         default:
1285                 return BAND_G;
1286         }
1287 }
1288
1289 /*
1290  * This is an internal function used to start a scan based on an input
1291  * configuration.
1292  *
1293  * This uses the input user scan configuration information when provided in
1294  * order to send the appropriate scan commands to firmware to populate or
1295  * update the internal driver scan table.
1296  */
1297 int mwifiex_scan_networks(struct mwifiex_private *priv,
1298                           const struct mwifiex_user_scan_cfg *user_scan_in)
1299 {
1300         int ret = 0;
1301         struct mwifiex_adapter *adapter = priv->adapter;
1302         struct cmd_ctrl_node *cmd_node;
1303         union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
1304         struct mwifiex_ie_types_chan_list_param_set *chan_list_out;
1305         u32 buf_size;
1306         struct mwifiex_chan_scan_param_set *scan_chan_list;
1307         u8 filtered_scan;
1308         u8 scan_current_chan_only;
1309         u8 max_chan_per_scan;
1310         unsigned long flags;
1311
1312         if (adapter->scan_processing) {
1313                 dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
1314                 return ret;
1315         }
1316
1317         spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1318         adapter->scan_processing = true;
1319         spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1320
1321         if (priv->scan_block) {
1322                 dev_dbg(adapter->dev,
1323                         "cmd: Scan is blocked during association...\n");
1324                 return ret;
1325         }
1326
1327         scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
1328                                                                 GFP_KERNEL);
1329         if (!scan_cfg_out) {
1330                 dev_err(adapter->dev, "failed to alloc scan_cfg_out\n");
1331                 return -ENOMEM;
1332         }
1333
1334         buf_size = sizeof(struct mwifiex_chan_scan_param_set) *
1335                                                 MWIFIEX_USER_SCAN_CHAN_MAX;
1336         scan_chan_list = kzalloc(buf_size, GFP_KERNEL);
1337         if (!scan_chan_list) {
1338                 dev_err(adapter->dev, "failed to alloc scan_chan_list\n");
1339                 kfree(scan_cfg_out);
1340                 return -ENOMEM;
1341         }
1342
1343         mwifiex_config_scan(priv, user_scan_in, &scan_cfg_out->config,
1344                             &chan_list_out, scan_chan_list, &max_chan_per_scan,
1345                             &filtered_scan, &scan_current_chan_only);
1346
1347         ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan,
1348                                         &scan_cfg_out->config, chan_list_out,
1349                                         scan_chan_list);
1350
1351         /* Get scan command from scan_pending_q and put to cmd_pending_q */
1352         if (!ret) {
1353                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1354                 if (!list_empty(&adapter->scan_pending_q)) {
1355                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1356                                                     struct cmd_ctrl_node, list);
1357                         list_del(&cmd_node->list);
1358                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1359                                                flags);
1360                         adapter->cmd_queued = cmd_node;
1361                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1362                                                         true);
1363                         queue_work(adapter->workqueue, &adapter->main_work);
1364                 } else {
1365                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1366                                                flags);
1367                 }
1368         } else {
1369                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1370                 adapter->scan_processing = true;
1371                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1372         }
1373
1374         kfree(scan_cfg_out);
1375         kfree(scan_chan_list);
1376         return ret;
1377 }
1378
1379 /*
1380  * This function prepares a scan command to be sent to the firmware.
1381  *
1382  * This uses the scan command configuration sent to the command processing
1383  * module in command preparation stage to configure a scan command structure
1384  * to send to firmware.
1385  *
1386  * The fixed fields specifying the BSS type and BSSID filters as well as a
1387  * variable number/length of TLVs are sent in the command to firmware.
1388  *
1389  * Preparation also includes -
1390  *      - Setting command ID, and proper size
1391  *      - Ensuring correct endian-ness
1392  */
1393 int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd,
1394                             struct mwifiex_scan_cmd_config *scan_cfg)
1395 {
1396         struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan;
1397
1398         /* Set fixed field variables in scan command */
1399         scan_cmd->bss_mode = scan_cfg->bss_mode;
1400         memcpy(scan_cmd->bssid, scan_cfg->specific_bssid,
1401                sizeof(scan_cmd->bssid));
1402         memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);
1403
1404         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN);
1405
1406         /* Size is equal to the sizeof(fixed portions) + the TLV len + header */
1407         cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode)
1408                                           + sizeof(scan_cmd->bssid)
1409                                           + scan_cfg->tlv_buf_len + S_DS_GEN));
1410
1411         return 0;
1412 }
1413
1414 /*
1415  * This function checks compatibility of requested network with current
1416  * driver settings.
1417  */
1418 int mwifiex_check_network_compatibility(struct mwifiex_private *priv,
1419                                         struct mwifiex_bssdescriptor *bss_desc)
1420 {
1421         int ret = -1;
1422
1423         if (!bss_desc)
1424                 return -1;
1425
1426         if ((mwifiex_get_cfp(priv, (u8) bss_desc->bss_band,
1427                              (u16) bss_desc->channel, 0))) {
1428                 switch (priv->bss_mode) {
1429                 case NL80211_IFTYPE_STATION:
1430                 case NL80211_IFTYPE_ADHOC:
1431                         ret = mwifiex_is_network_compatible(priv, bss_desc,
1432                                                             priv->bss_mode);
1433                         if (ret)
1434                                 dev_err(priv->adapter->dev, "cannot find ssid "
1435                                         "%s\n", bss_desc->ssid.ssid);
1436                                 break;
1437                 default:
1438                                 ret = 0;
1439                 }
1440         }
1441
1442         return ret;
1443 }
1444
1445 static int mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
1446                                           struct cfg80211_bss *bss)
1447 {
1448         struct mwifiex_bssdescriptor *bss_desc;
1449         int ret;
1450         unsigned long flags;
1451
1452         /* Allocate and fill new bss descriptor */
1453         bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor),
1454                         GFP_KERNEL);
1455         if (!bss_desc) {
1456                 dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
1457                 return -ENOMEM;
1458         }
1459
1460         ret = mwifiex_fill_new_bss_desc(priv, bss, bss_desc);
1461         if (ret)
1462                 goto done;
1463
1464         ret = mwifiex_check_network_compatibility(priv, bss_desc);
1465         if (ret)
1466                 goto done;
1467
1468         /* Update current bss descriptor parameters */
1469         spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags);
1470         priv->curr_bss_params.bss_descriptor.bcn_wpa_ie = NULL;
1471         priv->curr_bss_params.bss_descriptor.wpa_offset = 0;
1472         priv->curr_bss_params.bss_descriptor.bcn_rsn_ie = NULL;
1473         priv->curr_bss_params.bss_descriptor.rsn_offset = 0;
1474         priv->curr_bss_params.bss_descriptor.bcn_wapi_ie = NULL;
1475         priv->curr_bss_params.bss_descriptor.wapi_offset = 0;
1476         priv->curr_bss_params.bss_descriptor.bcn_ht_cap = NULL;
1477         priv->curr_bss_params.bss_descriptor.ht_cap_offset =
1478                 0;
1479         priv->curr_bss_params.bss_descriptor.bcn_ht_oper = NULL;
1480         priv->curr_bss_params.bss_descriptor.ht_info_offset =
1481                 0;
1482         priv->curr_bss_params.bss_descriptor.bcn_bss_co_2040 =
1483                 NULL;
1484         priv->curr_bss_params.bss_descriptor.
1485                 bss_co_2040_offset = 0;
1486         priv->curr_bss_params.bss_descriptor.bcn_ext_cap = NULL;
1487         priv->curr_bss_params.bss_descriptor.ext_cap_offset = 0;
1488         priv->curr_bss_params.bss_descriptor.beacon_buf = NULL;
1489         priv->curr_bss_params.bss_descriptor.beacon_buf_size =
1490                 0;
1491
1492         /* Make a copy of current BSSID descriptor */
1493         memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
1494                sizeof(priv->curr_bss_params.bss_descriptor));
1495         mwifiex_save_curr_bcn(priv);
1496         spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);
1497
1498 done:
1499         kfree(bss_desc);
1500         return 0;
1501 }
1502
1503 /*
1504  * This function handles the command response of scan.
1505  *
1506  * The response buffer for the scan command has the following
1507  * memory layout:
1508  *
1509  *      .-------------------------------------------------------------.
1510  *      |  Header (4 * sizeof(t_u16)):  Standard command response hdr |
1511  *      .-------------------------------------------------------------.
1512  *      |  BufSize (t_u16) : sizeof the BSS Description data          |
1513  *      .-------------------------------------------------------------.
1514  *      |  NumOfSet (t_u8) : Number of BSS Descs returned             |
1515  *      .-------------------------------------------------------------.
1516  *      |  BSSDescription data (variable, size given in BufSize)      |
1517  *      .-------------------------------------------------------------.
1518  *      |  TLV data (variable, size calculated using Header->Size,    |
1519  *      |            BufSize and sizeof the fixed fields above)       |
1520  *      .-------------------------------------------------------------.
1521  */
1522 int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
1523                             struct host_cmd_ds_command *resp)
1524 {
1525         int ret = 0;
1526         struct mwifiex_adapter *adapter = priv->adapter;
1527         struct cmd_ctrl_node *cmd_node;
1528         struct host_cmd_ds_802_11_scan_rsp *scan_rsp;
1529         struct mwifiex_ie_types_data *tlv_data;
1530         struct mwifiex_ie_types_tsf_timestamp *tsf_tlv;
1531         u8 *bss_info;
1532         u32 scan_resp_size;
1533         u32 bytes_left;
1534         u32 idx;
1535         u32 tlv_buf_size;
1536         struct mwifiex_chan_freq_power *cfp;
1537         struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv;
1538         struct chan_band_param_set *chan_band;
1539         u8 is_bgscan_resp;
1540         unsigned long flags;
1541         struct cfg80211_bss *bss;
1542
1543         is_bgscan_resp = (le16_to_cpu(resp->command)
1544                           == HostCmd_CMD_802_11_BG_SCAN_QUERY);
1545         if (is_bgscan_resp)
1546                 scan_rsp = &resp->params.bg_scan_query_resp.scan_resp;
1547         else
1548                 scan_rsp = &resp->params.scan_resp;
1549
1550
1551         if (scan_rsp->number_of_sets > MWIFIEX_MAX_AP) {
1552                 dev_err(adapter->dev, "SCAN_RESP: too many AP returned (%d)\n",
1553                         scan_rsp->number_of_sets);
1554                 ret = -1;
1555                 goto done;
1556         }
1557
1558         bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
1559         dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n",
1560                 bytes_left);
1561
1562         scan_resp_size = le16_to_cpu(resp->size);
1563
1564         dev_dbg(adapter->dev,
1565                 "info: SCAN_RESP: returned %d APs before parsing\n",
1566                 scan_rsp->number_of_sets);
1567
1568         bss_info = scan_rsp->bss_desc_and_tlv_buffer;
1569
1570         /*
1571          * The size of the TLV buffer is equal to the entire command response
1572          *   size (scan_resp_size) minus the fixed fields (sizeof()'s), the
1573          *   BSS Descriptions (bss_descript_size as bytesLef) and the command
1574          *   response header (S_DS_GEN)
1575          */
1576         tlv_buf_size = scan_resp_size - (bytes_left
1577                                          + sizeof(scan_rsp->bss_descript_size)
1578                                          + sizeof(scan_rsp->number_of_sets)
1579                                          + S_DS_GEN);
1580
1581         tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp->
1582                                                  bss_desc_and_tlv_buffer +
1583                                                  bytes_left);
1584
1585         /* Search the TLV buffer space in the scan response for any valid
1586            TLVs */
1587         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1588                                              TLV_TYPE_TSFTIMESTAMP,
1589                                              (struct mwifiex_ie_types_data **)
1590                                              &tsf_tlv);
1591
1592         /* Search the TLV buffer space in the scan response for any valid
1593            TLVs */
1594         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1595                                              TLV_TYPE_CHANNELBANDLIST,
1596                                              (struct mwifiex_ie_types_data **)
1597                                              &chan_band_tlv);
1598
1599         for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) {
1600                 u8 bssid[ETH_ALEN];
1601                 s32 rssi;
1602                 const u8 *ie_buf;
1603                 size_t ie_len;
1604                 u16 channel = 0;
1605                 u64 fw_tsf = 0;
1606                 u16 beacon_size = 0;
1607                 u32 curr_bcn_bytes;
1608                 u32 freq;
1609                 u16 beacon_period;
1610                 u16 cap_info_bitmap;
1611                 u8 *current_ptr;
1612                 u64 timestamp;
1613                 struct mwifiex_bcn_param *bcn_param;
1614                 struct mwifiex_bss_priv *bss_priv;
1615
1616                 if (bytes_left >= sizeof(beacon_size)) {
1617                         /* Extract & convert beacon size from command buffer */
1618                         memcpy(&beacon_size, bss_info, sizeof(beacon_size));
1619                         bytes_left -= sizeof(beacon_size);
1620                         bss_info += sizeof(beacon_size);
1621                 }
1622
1623                 if (!beacon_size || beacon_size > bytes_left) {
1624                         bss_info += bytes_left;
1625                         bytes_left = 0;
1626                         return -1;
1627                 }
1628
1629                 /* Initialize the current working beacon pointer for this BSS
1630                  * iteration */
1631                 current_ptr = bss_info;
1632
1633                 /* Advance the return beacon pointer past the current beacon */
1634                 bss_info += beacon_size;
1635                 bytes_left -= beacon_size;
1636
1637                 curr_bcn_bytes = beacon_size;
1638
1639                 /*
1640                  * First 5 fields are bssid, RSSI, time stamp, beacon interval,
1641                  *   and capability information
1642                  */
1643                 if (curr_bcn_bytes < sizeof(struct mwifiex_bcn_param)) {
1644                         dev_err(adapter->dev,
1645                                 "InterpretIE: not enough bytes left\n");
1646                         continue;
1647                 }
1648                 bcn_param = (struct mwifiex_bcn_param *)current_ptr;
1649                 current_ptr += sizeof(*bcn_param);
1650                 curr_bcn_bytes -= sizeof(*bcn_param);
1651
1652                 memcpy(bssid, bcn_param->bssid, ETH_ALEN);
1653
1654                 rssi = (s32) bcn_param->rssi;
1655                 rssi = (-rssi) * 100;           /* Convert dBm to mBm */
1656                 dev_dbg(adapter->dev, "info: InterpretIE: RSSI=%d\n", rssi);
1657
1658                 timestamp = le64_to_cpu(bcn_param->timestamp);
1659                 beacon_period = le16_to_cpu(bcn_param->beacon_period);
1660
1661                 cap_info_bitmap = le16_to_cpu(bcn_param->cap_info_bitmap);
1662                 dev_dbg(adapter->dev, "info: InterpretIE: capabilities=0x%X\n",
1663                         cap_info_bitmap);
1664
1665                 /* Rest of the current buffer are IE's */
1666                 ie_buf = current_ptr;
1667                 ie_len = curr_bcn_bytes;
1668                 dev_dbg(adapter->dev,
1669                         "info: InterpretIE: IELength for this AP = %d\n",
1670                         curr_bcn_bytes);
1671
1672                 while (curr_bcn_bytes >= sizeof(struct ieee_types_header)) {
1673                         u8 element_id, element_len;
1674
1675                         element_id = *current_ptr;
1676                         element_len = *(current_ptr + 1);
1677                         if (curr_bcn_bytes < element_len +
1678                                         sizeof(struct ieee_types_header)) {
1679                                 dev_err(priv->adapter->dev,
1680                                         "%s: bytes left < IE length\n",
1681                                         __func__);
1682                                 goto done;
1683                         }
1684                         if (element_id == WLAN_EID_DS_PARAMS) {
1685                                 channel = *(current_ptr + sizeof(struct ieee_types_header));
1686                                 break;
1687                         }
1688
1689                         current_ptr += element_len +
1690                                         sizeof(struct ieee_types_header);
1691                         curr_bcn_bytes -= element_len +
1692                                         sizeof(struct ieee_types_header);
1693                 }
1694
1695                 /*
1696                  * If the TSF TLV was appended to the scan results, save this
1697                  * entry's TSF value in the fw_tsf field. It is the firmware's
1698                  * TSF value at the time the beacon or probe response was
1699                  * received.
1700                  */
1701                 if (tsf_tlv)
1702                         memcpy(&fw_tsf, &tsf_tlv->tsf_data[idx * TSF_DATA_SIZE],
1703                                sizeof(fw_tsf));
1704
1705                 if (channel) {
1706                         struct ieee80211_channel *chan;
1707                         u8 band;
1708
1709                         band = BAND_G;
1710                         if (chan_band_tlv) {
1711                                 chan_band =
1712                                         &chan_band_tlv->chan_band_param[idx];
1713                                 band = mwifiex_radio_type_to_band(
1714                                                 chan_band->radio_type
1715                                                 & (BIT(0) | BIT(1)));
1716                         }
1717
1718                         cfp = mwifiex_get_cfp(priv, band, channel, 0);
1719
1720                         freq = cfp ? cfp->freq : 0;
1721
1722                         chan = ieee80211_get_channel(priv->wdev->wiphy, freq);
1723
1724                         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
1725                                 bss = cfg80211_inform_bss(priv->wdev->wiphy,
1726                                               chan, bssid, timestamp,
1727                                               cap_info_bitmap, beacon_period,
1728                                               ie_buf, ie_len, rssi, GFP_KERNEL);
1729                                 bss_priv = (struct mwifiex_bss_priv *)bss->priv;
1730                                 bss_priv->band = band;
1731                                 bss_priv->fw_tsf = fw_tsf;
1732                                 if (priv->media_connected &&
1733                                     !memcmp(bssid,
1734                                             priv->curr_bss_params.bss_descriptor
1735                                             .mac_address, ETH_ALEN))
1736                                         mwifiex_update_curr_bss_params(priv,
1737                                                                        bss);
1738                                 cfg80211_put_bss(bss);
1739                         }
1740                 } else {
1741                         dev_dbg(adapter->dev, "missing BSS channel IE\n");
1742                 }
1743         }
1744
1745         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1746         if (list_empty(&adapter->scan_pending_q)) {
1747                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1748                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1749                 adapter->scan_processing = false;
1750                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1751
1752                 /* Need to indicate IOCTL complete */
1753                 if (adapter->curr_cmd->wait_q_enabled) {
1754                         adapter->cmd_wait_q.status = 0;
1755                         mwifiex_complete_cmd(adapter, adapter->curr_cmd);
1756                 }
1757                 if (priv->report_scan_result)
1758                         priv->report_scan_result = false;
1759                 if (priv->scan_pending_on_block) {
1760                         priv->scan_pending_on_block = false;
1761                         up(&priv->async_sem);
1762                 }
1763
1764                 if (priv->user_scan_cfg) {
1765                         dev_dbg(priv->adapter->dev,
1766                                 "info: %s: sending scan results\n", __func__);
1767                         cfg80211_scan_done(priv->scan_request, 0);
1768                         priv->scan_request = NULL;
1769                         kfree(priv->user_scan_cfg);
1770                         priv->user_scan_cfg = NULL;
1771                 }
1772         } else {
1773                 if (!mwifiex_wmm_lists_empty(adapter)) {
1774                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1775                                                flags);
1776                         adapter->scan_delay_cnt = 1;
1777                         mod_timer(&priv->scan_delay_timer, jiffies +
1778                                   msecs_to_jiffies(MWIFIEX_SCAN_DELAY_MSEC));
1779                 } else {
1780                         /* Get scan command from scan_pending_q and put to
1781                            cmd_pending_q */
1782                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1783                                                     struct cmd_ctrl_node, list);
1784                         list_del(&cmd_node->list);
1785                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1786                                                flags);
1787                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1788                                                         true);
1789                 }
1790         }
1791
1792 done:
1793         return ret;
1794 }
1795
1796 /*
1797  * This function prepares command for background scan query.
1798  *
1799  * Preparation includes -
1800  *      - Setting command ID and proper size
1801  *      - Setting background scan flush parameter
1802  *      - Ensuring correct endian-ness
1803  */
1804 int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd)
1805 {
1806         struct host_cmd_ds_802_11_bg_scan_query *bg_query =
1807                 &cmd->params.bg_scan_query;
1808
1809         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY);
1810         cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query)
1811                                 + S_DS_GEN);
1812
1813         bg_query->flush = 1;
1814
1815         return 0;
1816 }
1817
1818 /*
1819  * This function inserts scan command node to the scan pending queue.
1820  */
1821 void
1822 mwifiex_queue_scan_cmd(struct mwifiex_private *priv,
1823                        struct cmd_ctrl_node *cmd_node)
1824 {
1825         struct mwifiex_adapter *adapter = priv->adapter;
1826         unsigned long flags;
1827
1828         cmd_node->wait_q_enabled = true;
1829         cmd_node->condition = &adapter->scan_wait_q_woken;
1830         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1831         list_add_tail(&cmd_node->list, &adapter->scan_pending_q);
1832         spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1833 }
1834
1835 /*
1836  * This function sends a scan command for all available channels to the
1837  * firmware, filtered on a specific SSID.
1838  */
1839 static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv,
1840                                       struct cfg80211_ssid *req_ssid)
1841 {
1842         struct mwifiex_adapter *adapter = priv->adapter;
1843         int ret = 0;
1844         struct mwifiex_user_scan_cfg *scan_cfg;
1845
1846         if (!req_ssid)
1847                 return -1;
1848
1849         if (adapter->scan_processing) {
1850                 dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
1851                 return ret;
1852         }
1853
1854         if (priv->scan_block) {
1855                 dev_dbg(adapter->dev,
1856                         "cmd: Scan is blocked during association...\n");
1857                 return ret;
1858         }
1859
1860         scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL);
1861         if (!scan_cfg) {
1862                 dev_err(adapter->dev, "failed to alloc scan_cfg\n");
1863                 return -ENOMEM;
1864         }
1865
1866         scan_cfg->ssid_list = req_ssid;
1867         scan_cfg->num_ssids = 1;
1868
1869         ret = mwifiex_scan_networks(priv, scan_cfg);
1870
1871         kfree(scan_cfg);
1872         return ret;
1873 }
1874
1875 /*
1876  * Sends IOCTL request to start a scan.
1877  *
1878  * This function allocates the IOCTL request buffer, fills it
1879  * with requisite parameters and calls the IOCTL handler.
1880  *
1881  * Scan command can be issued for both normal scan and specific SSID
1882  * scan, depending upon whether an SSID is provided or not.
1883  */
1884 int mwifiex_request_scan(struct mwifiex_private *priv,
1885                          struct cfg80211_ssid *req_ssid)
1886 {
1887         int ret;
1888
1889         if (down_interruptible(&priv->async_sem)) {
1890                 dev_err(priv->adapter->dev, "%s: acquire semaphore\n",
1891                         __func__);
1892                 return -1;
1893         }
1894         priv->scan_pending_on_block = true;
1895
1896         priv->adapter->scan_wait_q_woken = false;
1897
1898         if (req_ssid && req_ssid->ssid_len != 0)
1899                 /* Specific SSID scan */
1900                 ret = mwifiex_scan_specific_ssid(priv, req_ssid);
1901         else
1902                 /* Normal scan */
1903                 ret = mwifiex_scan_networks(priv, NULL);
1904
1905         if (!ret)
1906                 ret = mwifiex_wait_queue_complete(priv->adapter);
1907
1908         if (ret == -1) {
1909                 priv->scan_pending_on_block = false;
1910                 up(&priv->async_sem);
1911         }
1912
1913         return ret;
1914 }
1915
1916 /*
1917  * This function appends the vendor specific IE TLV to a buffer.
1918  */
1919 int
1920 mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv,
1921                             u16 vsie_mask, u8 **buffer)
1922 {
1923         int id, ret_len = 0;
1924         struct mwifiex_ie_types_vendor_param_set *vs_param_set;
1925
1926         if (!buffer)
1927                 return 0;
1928         if (!(*buffer))
1929                 return 0;
1930
1931         /*
1932          * Traverse through the saved vendor specific IE array and append
1933          * the selected(scan/assoc/adhoc) IE as TLV to the command
1934          */
1935         for (id = 0; id < MWIFIEX_MAX_VSIE_NUM; id++) {
1936                 if (priv->vs_ie[id].mask & vsie_mask) {
1937                         vs_param_set =
1938                                 (struct mwifiex_ie_types_vendor_param_set *)
1939                                 *buffer;
1940                         vs_param_set->header.type =
1941                                 cpu_to_le16(TLV_TYPE_PASSTHROUGH);
1942                         vs_param_set->header.len =
1943                                 cpu_to_le16((((u16) priv->vs_ie[id].ie[1])
1944                                 & 0x00FF) + 2);
1945                         memcpy(vs_param_set->ie, priv->vs_ie[id].ie,
1946                                le16_to_cpu(vs_param_set->header.len));
1947                         *buffer += le16_to_cpu(vs_param_set->header.len) +
1948                                    sizeof(struct mwifiex_ie_types_header);
1949                         ret_len += le16_to_cpu(vs_param_set->header.len) +
1950                                    sizeof(struct mwifiex_ie_types_header);
1951                 }
1952         }
1953         return ret_len;
1954 }
1955
1956 /*
1957  * This function saves a beacon buffer of the current BSS descriptor.
1958  *
1959  * The current beacon buffer is saved so that it can be restored in the
1960  * following cases that makes the beacon buffer not to contain the current
1961  * ssid's beacon buffer.
1962  *      - The current ssid was not found somehow in the last scan.
1963  *      - The current ssid was the last entry of the scan table and overloaded.
1964  */
1965 void
1966 mwifiex_save_curr_bcn(struct mwifiex_private *priv)
1967 {
1968         struct mwifiex_bssdescriptor *curr_bss =
1969                 &priv->curr_bss_params.bss_descriptor;
1970
1971         if (!curr_bss->beacon_buf_size)
1972                 return;
1973
1974         /* allocate beacon buffer at 1st time; or if it's size has changed */
1975         if (!priv->curr_bcn_buf ||
1976             priv->curr_bcn_size != curr_bss->beacon_buf_size) {
1977                 priv->curr_bcn_size = curr_bss->beacon_buf_size;
1978
1979                 kfree(priv->curr_bcn_buf);
1980                 priv->curr_bcn_buf = kmalloc(curr_bss->beacon_buf_size,
1981                                              GFP_ATOMIC);
1982                 if (!priv->curr_bcn_buf) {
1983                         dev_err(priv->adapter->dev,
1984                                 "failed to alloc curr_bcn_buf\n");
1985                         return;
1986                 }
1987         }
1988
1989         memcpy(priv->curr_bcn_buf, curr_bss->beacon_buf,
1990                curr_bss->beacon_buf_size);
1991         dev_dbg(priv->adapter->dev, "info: current beacon saved %d\n",
1992                 priv->curr_bcn_size);
1993
1994         curr_bss->beacon_buf = priv->curr_bcn_buf;
1995
1996         /* adjust the pointers in the current BSS descriptor */
1997         if (curr_bss->bcn_wpa_ie)
1998                 curr_bss->bcn_wpa_ie =
1999                         (struct ieee_types_vendor_specific *)
2000                         (curr_bss->beacon_buf +
2001                          curr_bss->wpa_offset);
2002
2003         if (curr_bss->bcn_rsn_ie)
2004                 curr_bss->bcn_rsn_ie = (struct ieee_types_generic *)
2005                         (curr_bss->beacon_buf +
2006                          curr_bss->rsn_offset);
2007
2008         if (curr_bss->bcn_ht_cap)
2009                 curr_bss->bcn_ht_cap = (struct ieee80211_ht_cap *)
2010                         (curr_bss->beacon_buf +
2011                          curr_bss->ht_cap_offset);
2012
2013         if (curr_bss->bcn_ht_oper)
2014                 curr_bss->bcn_ht_oper = (struct ieee80211_ht_operation *)
2015                         (curr_bss->beacon_buf +
2016                          curr_bss->ht_info_offset);
2017
2018         if (curr_bss->bcn_bss_co_2040)
2019                 curr_bss->bcn_bss_co_2040 =
2020                         (curr_bss->beacon_buf + curr_bss->bss_co_2040_offset);
2021
2022         if (curr_bss->bcn_ext_cap)
2023                 curr_bss->bcn_ext_cap = curr_bss->beacon_buf +
2024                         curr_bss->ext_cap_offset;
2025 }
2026
2027 /*
2028  * This function frees the current BSS descriptor beacon buffer.
2029  */
2030 void
2031 mwifiex_free_curr_bcn(struct mwifiex_private *priv)
2032 {
2033         kfree(priv->curr_bcn_buf);
2034         priv->curr_bcn_buf = NULL;
2035 }