drivers/staging/rtl8712/ieee80211.c

   1 /******************************************************************************
   2  * ieee80211.c
   3  *
   4  * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
   5  * Linux device driver for RTL8192SU
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * Modifications for inclusion into the Linux staging tree are
  21  * Copyright(c) 2010 Larry Finger. All rights reserved.
  22  *
  23  * Contact information:
  24  * WLAN FAE <wlanfae@realtek.com>.
  25  * Larry Finger <Larry.Finger@lwfinger.net>
  26  *
  27  ******************************************************************************/
  28
  29 #define _IEEE80211_C
  30
  31 #include "drv_types.h"
  32 #include "ieee80211.h"
  33 #include "wifi.h"
  34 #include "osdep_service.h"
  35 #include "wlan_bssdef.h"
  36
  37 static const u8 WPA_OUI_TYPE[] = {0x00, 0x50, 0xf2, 1};
  38 static const u8 WPA_CIPHER_SUITE_NONE[] = {0x00, 0x50, 0xf2, 0};
  39 static const u8 WPA_CIPHER_SUITE_WEP40[] = {0x00, 0x50, 0xf2, 1};
  40 static const u8 WPA_CIPHER_SUITE_TKIP[] = {0x00, 0x50, 0xf2, 2};
  41 static const u8 WPA_CIPHER_SUITE_CCMP[] = {0x00, 0x50, 0xf2, 4};
  42 static const u8 WPA_CIPHER_SUITE_WEP104[] = {0x00, 0x50, 0xf2, 5};
  43
  44 static const u8 RSN_CIPHER_SUITE_NONE[] = {0x00, 0x0f, 0xac, 0};
  45 static const u8 RSN_CIPHER_SUITE_WEP40[] = {0x00, 0x0f, 0xac, 1};
  46 static const u8 RSN_CIPHER_SUITE_TKIP[] = {0x00, 0x0f, 0xac, 2};
  47 static const u8 RSN_CIPHER_SUITE_CCMP[] = {0x00, 0x0f, 0xac, 4};
  48 static const u8 RSN_CIPHER_SUITE_WEP104[] = {0x00, 0x0f, 0xac, 5};
  49
  50 /*-----------------------------------------------------------
  51  * for adhoc-master to generate ie and provide supported-rate to fw
  52  *-----------------------------------------------------------
  53  */
  54
  55 static u8 WIFI_CCKRATES[] =  {
  56         (IEEE80211_CCK_RATE_1MB | IEEE80211_BASIC_RATE_MASK),
  57         (IEEE80211_CCK_RATE_2MB | IEEE80211_BASIC_RATE_MASK),
  58         (IEEE80211_CCK_RATE_5MB | IEEE80211_BASIC_RATE_MASK),
  59         (IEEE80211_CCK_RATE_11MB | IEEE80211_BASIC_RATE_MASK)
  60 };
  61
  62 static u8 WIFI_OFDMRATES[] = {
  63         (IEEE80211_OFDM_RATE_6MB),
  64         (IEEE80211_OFDM_RATE_9MB),
  65         (IEEE80211_OFDM_RATE_12MB),
  66         (IEEE80211_OFDM_RATE_18MB),
  67         (IEEE80211_OFDM_RATE_24MB),
  68         (IEEE80211_OFDM_RATE_36MB),
  69         (IEEE80211_OFDM_RATE_48MB),
  70         (IEEE80211_OFDM_RATE_54MB)
  71 };
  72
  73 uint r8712_is_cckrates_included(u8 *rate)
  74 {
  75         u32 i = 0;
  76
  77         while (rate[i] != 0) {
  78                 if ((((rate[i]) & 0x7f) == 2) || (((rate[i]) & 0x7f) == 4) ||
  79                     (((rate[i]) & 0x7f) == 11) || (((rate[i]) & 0x7f) == 22))
  80                         return true;
  81                         i++;
  82                 }
  83                 return false;
  84 }
  85
  86 uint r8712_is_cckratesonly_included(u8 *rate)
  87 {
  88         u32 i = 0;
  89
  90         while (rate[i] != 0) {
  91                 if ((((rate[i]) & 0x7f) != 2) && (((rate[i]) & 0x7f) != 4) &&
  92                     (((rate[i]) & 0x7f) != 11)  && (((rate[i]) & 0x7f) != 22))
  93                         return false;
  94                 i++;
  95         }
  96         return true;
  97 }
  98
  99 /* r8712_set_ie will update frame length */
 100 u8 *r8712_set_ie(u8 *pbuf, sint index, uint len, u8 *source, uint *frlen)
 101 {
 102         *pbuf = (u8)index;
 103         *(pbuf + 1) = (u8)len;
 104         if (len > 0)
 105                 memcpy((void *)(pbuf + 2), (void *)source, len);
 106         *frlen = *frlen + (len + 2);
 107         return pbuf + len + 2;
 108 }
 109
 110 /*----------------------------------------------------------------------------
 111 index: the information element id index, limit is the limit for search
 112 -----------------------------------------------------------------------------*/
 113 u8 *r8712_get_ie(u8 *pbuf, sint index, sint *len, sint limit)
 114 {
 115         sint tmp, i;
 116         u8 *p;
 117
 118         if (limit < 1)
 119                 return NULL;
 120         p = pbuf;
 121         i = 0;
 122         *len = 0;
 123         while (1) {
 124                 if (*p == index) {
 125                         *len = *(p + 1);
 126                         return p;
 127                 } else {
 128                         tmp = *(p + 1);
 129                         p += (tmp + 2);
 130                         i += (tmp + 2);
 131                 }
 132                 if (i >= limit)
 133                         break;
 134         }
 135         return NULL;
 136 }
 137
 138 static void set_supported_rate(u8 *SupportedRates, uint mode)
 139 {
 140         memset(SupportedRates, 0, NDIS_802_11_LENGTH_RATES_EX);
 141         switch (mode) {
 142         case WIRELESS_11B:
 143                 memcpy(SupportedRates, WIFI_CCKRATES,
 144                         IEEE80211_CCK_RATE_LEN);
 145                 break;
 146         case WIRELESS_11G:
 147         case WIRELESS_11A:
 148                 memcpy(SupportedRates, WIFI_OFDMRATES,
 149                         IEEE80211_NUM_OFDM_RATESLEN);
 150                 break;
 151         case WIRELESS_11BG:
 152                 memcpy(SupportedRates, WIFI_CCKRATES, IEEE80211_CCK_RATE_LEN);
 153                 memcpy(SupportedRates + IEEE80211_CCK_RATE_LEN, WIFI_OFDMRATES,
 154                         IEEE80211_NUM_OFDM_RATESLEN);
 155                 break;
 156         }
 157 }
 158
 159 static uint r8712_get_rateset_len(u8 *rateset)
 160 {
 161         uint i = 0;
 162
 163         while (1) {
 164                 if ((rateset[i]) == 0)
 165                         break;
 166                 if (i > 12)
 167                         break;
 168                 i++;
 169         }
 170         return i;
 171 }
 172
 173 int r8712_generate_ie(struct registry_priv *pregistrypriv)
 174 {
 175         int sz = 0, rateLen;
 176         struct wlan_bssid_ex *pdev_network = &pregistrypriv->dev_network;
 177         u8 *ie = pdev_network->IEs;
 178
 179         /*timestamp will be inserted by hardware*/
 180         sz += 8;
 181         ie += sz;
 182         /*beacon interval : 2bytes*/
 183         *(u16 *)ie = cpu_to_le16((u16)pdev_network->Configuration.BeaconPeriod);
 184         sz += 2;
 185         ie += 2;
 186         /*capability info*/
 187         *(u16 *)ie = 0;
 188         *(u16 *)ie |= cpu_to_le16(cap_IBSS);
 189         if (pregistrypriv->preamble == PREAMBLE_SHORT)
 190                 *(u16 *)ie |= cpu_to_le16(cap_ShortPremble);
 191         if (pdev_network->Privacy)
 192                 *(u16 *)ie |= cpu_to_le16(cap_Privacy);
 193         sz += 2;
 194         ie += 2;
 195         /*SSID*/
 196         ie = r8712_set_ie(ie, _SSID_IE_, pdev_network->Ssid.SsidLength,
 197                     pdev_network->Ssid.Ssid, &sz);
 198         /*supported rates*/
 199         set_supported_rate(pdev_network->SupportedRates,
 200                            pregistrypriv->wireless_mode);
 201         rateLen = r8712_get_rateset_len(pdev_network->SupportedRates);
 202         if (rateLen > 8) {
 203                 ie = r8712_set_ie(ie, _SUPPORTEDRATES_IE_, 8,
 204                             pdev_network->SupportedRates, &sz);
 205                 ie = r8712_set_ie(ie, _EXT_SUPPORTEDRATES_IE_, (rateLen - 8),
 206                             (pdev_network->SupportedRates + 8), &sz);
 207         } else
 208                 ie = r8712_set_ie(ie, _SUPPORTEDRATES_IE_,
 209                             rateLen, pdev_network->SupportedRates, &sz);
 210         /*DS parameter set*/
 211         ie = r8712_set_ie(ie, _DSSET_IE_, 1,
 212                     (u8 *)&(pdev_network->Configuration.DSConfig), &sz);
 213         /*IBSS Parameter Set*/
 214         ie = r8712_set_ie(ie, _IBSS_PARA_IE_, 2,
 215                     (u8 *)&(pdev_network->Configuration.ATIMWindow), &sz);
 216         return sz;
 217 }
 218
 219 unsigned char *r8712_get_wpa_ie(unsigned char *pie, int *wpa_ie_len, int limit)
 220 {
 221         int len;
 222         u16 val16;
 223         unsigned char wpa_oui_type[] = {0x00, 0x50, 0xf2, 0x01};
 224         u8 *pbuf = pie;
 225
 226         while (1) {
 227                 pbuf = r8712_get_ie(pbuf, _WPA_IE_ID_, &len, limit);
 228                 if (pbuf) {
 229                         /*check if oui matches...*/
 230                         if (memcmp((pbuf + 2), wpa_oui_type,
 231                             sizeof(wpa_oui_type)))
 232                                 goto check_next_ie;
 233                         /*check version...*/
 234                         memcpy((u8 *)&val16, (pbuf + 6), sizeof(val16));
 235                         val16 = le16_to_cpu(val16);
 236                         if (val16 != 0x0001)
 237                                 goto check_next_ie;
 238                         *wpa_ie_len = *(pbuf + 1);
 239                         return pbuf;
 240                 } else {
 241                         *wpa_ie_len = 0;
 242                         return NULL;
 243                 }
 244 check_next_ie:
 245                 limit = limit - (pbuf - pie) - 2 - len;
 246                 if (limit <= 0)
 247                         break;
 248                 pbuf += (2 + len);
 249         }
 250         *wpa_ie_len = 0;
 251         return NULL;
 252 }
 253
 254 unsigned char *r8712_get_wpa2_ie(unsigned char *pie, int *rsn_ie_len, int limit)
 255 {
 256         return r8712_get_ie(pie, _WPA2_IE_ID_, rsn_ie_len, limit);
 257 }
 258
 259 static int r8712_get_wpa_cipher_suite(u8 *s)
 260 {
 261         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_NONE, WPA_SELECTOR_LEN))
 262                 return WPA_CIPHER_NONE;
 263         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_WEP40, WPA_SELECTOR_LEN))
 264                 return WPA_CIPHER_WEP40;
 265         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_TKIP, WPA_SELECTOR_LEN))
 266                 return WPA_CIPHER_TKIP;
 267         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_CCMP, WPA_SELECTOR_LEN))
 268                 return WPA_CIPHER_CCMP;
 269         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_WEP104, WPA_SELECTOR_LEN))
 270                 return WPA_CIPHER_WEP104;
 271         return 0;
 272 }
 273
 274 static int r8712_get_wpa2_cipher_suite(u8 *s)
 275 {
 276         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_NONE, RSN_SELECTOR_LEN))
 277                 return WPA_CIPHER_NONE;
 278         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_WEP40, RSN_SELECTOR_LEN))
 279                 return WPA_CIPHER_WEP40;
 280         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_TKIP, RSN_SELECTOR_LEN))
 281                 return WPA_CIPHER_TKIP;
 282         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_CCMP, RSN_SELECTOR_LEN))
 283                 return WPA_CIPHER_CCMP;
 284         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_WEP104, RSN_SELECTOR_LEN))
 285                 return WPA_CIPHER_WEP104;
 286         return 0;
 287 }
 288
 289 int r8712_parse_wpa_ie(u8 *wpa_ie, int wpa_ie_len, int *group_cipher,
 290                  int *pairwise_cipher)
 291 {
 292         int i, ret = _SUCCESS;
 293         int left, count;
 294         u8 *pos;
 295
 296         if (wpa_ie_len <= 0) {
 297                 /* No WPA IE - fail silently */
 298                 return _FAIL;
 299         }
 300         if ((*wpa_ie != _WPA_IE_ID_) || (*(wpa_ie + 1) != (u8)(wpa_ie_len - 2))
 301              || (memcmp(wpa_ie + 2, (void *)WPA_OUI_TYPE, WPA_SELECTOR_LEN)))
 302                 return _FAIL;
 303         pos = wpa_ie;
 304         pos += 8;
 305         left = wpa_ie_len - 8;
 306         /*group_cipher*/
 307         if (left >= WPA_SELECTOR_LEN) {
 308                 *group_cipher = r8712_get_wpa_cipher_suite(pos);
 309                 pos += WPA_SELECTOR_LEN;
 310                 left -= WPA_SELECTOR_LEN;
 311         } else if (left > 0)
 312                 return _FAIL;
 313         /*pairwise_cipher*/
 314         if (left >= 2) {
 315                 count = le16_to_cpu(*(u16 *)pos);
 316                 pos += 2;
 317                 left -= 2;
 318                 if (count == 0 || left < count * WPA_SELECTOR_LEN)
 319                         return _FAIL;
 320                 for (i = 0; i < count; i++) {
 321                         *pairwise_cipher |= r8712_get_wpa_cipher_suite(pos);
 322                         pos += WPA_SELECTOR_LEN;
 323                         left -= WPA_SELECTOR_LEN;
 324                 }
 325         } else if (left == 1)
 326                 return _FAIL;
 327         return ret;
 328 }
 329
 330 int r8712_parse_wpa2_ie(u8 *rsn_ie, int rsn_ie_len, int *group_cipher,
 331                   int *pairwise_cipher)
 332 {
 333         int i, ret = _SUCCESS;
 334         int left, count;
 335         u8 *pos;
 336
 337         if (rsn_ie_len <= 0) {
 338                 /* No RSN IE - fail silently */
 339                 return _FAIL;
 340         }
 341         if ((*rsn_ie != _WPA2_IE_ID_) || (*(rsn_ie+1) != (u8)(rsn_ie_len - 2)))
 342                 return _FAIL;
 343         pos = rsn_ie;
 344         pos += 4;
 345         left = rsn_ie_len - 4;
 346         /*group_cipher*/
 347         if (left >= RSN_SELECTOR_LEN) {
 348                 *group_cipher = r8712_get_wpa2_cipher_suite(pos);
 349                 pos += RSN_SELECTOR_LEN;
 350                 left -= RSN_SELECTOR_LEN;
 351         } else if (left > 0)
 352                 return _FAIL;
 353         /*pairwise_cipher*/
 354         if (left >= 2) {
 355                 count = le16_to_cpu(*(u16 *)pos);
 356                 pos += 2;
 357                 left -= 2;
 358                 if (count == 0 || left < count * RSN_SELECTOR_LEN)
 359                         return _FAIL;
 360                 for (i = 0; i < count; i++) {
 361                         *pairwise_cipher |= r8712_get_wpa2_cipher_suite(pos);
 362                         pos += RSN_SELECTOR_LEN;
 363                         left -= RSN_SELECTOR_LEN;
 364                 }
 365         } else if (left == 1)
 366                 return _FAIL;
 367         return ret;
 368 }
 369
 370 int r8712_get_sec_ie(u8 *in_ie, uint in_len, u8 *rsn_ie, u16 *rsn_len,
 371                u8 *wpa_ie, u16 *wpa_len)
 372 {
 373         u8 authmode, sec_idx;
 374         u8 wpa_oui[4] = {0x0, 0x50, 0xf2, 0x01};
 375         uint cnt;
 376
 377         /*Search required WPA or WPA2 IE and copy to sec_ie[ ]*/
 378         cnt = (_TIMESTAMP_ + _BEACON_ITERVAL_ + _CAPABILITY_);
 379         sec_idx = 0;
 380         while (cnt < in_len) {
 381                 authmode = in_ie[cnt];
 382                 if ((authmode == _WPA_IE_ID_) &&
 383                     (!memcmp(&in_ie[cnt + 2], &wpa_oui[0], 4))) {
 384                         memcpy(wpa_ie, &in_ie[cnt], in_ie[cnt + 1] + 2);
 385                         *wpa_len = in_ie[cnt+1]+2;
 386                         cnt += in_ie[cnt + 1] + 2;  /*get next */
 387                 } else {
 388                         if (authmode == _WPA2_IE_ID_) {
 389                                 memcpy(rsn_ie, &in_ie[cnt],
 390                                         in_ie[cnt + 1] + 2);
 391                                 *rsn_len = in_ie[cnt+1] + 2;
 392                                 cnt += in_ie[cnt+1] + 2;  /*get next*/
 393                         } else
 394                                 cnt += in_ie[cnt+1] + 2;   /*get next*/
 395                 }
 396         }
 397         return *rsn_len + *wpa_len;
 398 }
 399
 400 int r8712_get_wps_ie(u8 *in_ie, uint in_len, u8 *wps_ie, uint *wps_ielen)
 401 {
 402         int match;
 403         uint cnt;
 404         u8 eid, wps_oui[4] = {0x0, 0x50, 0xf2, 0x04};
 405
 406         cnt = 12;
 407         match = false;
 408         while (cnt < in_len) {
 409                 eid = in_ie[cnt];
 410                 if ((eid == _WPA_IE_ID_) &&
 411                     (!memcmp(&in_ie[cnt+2], wps_oui, 4))) {
 412                         memcpy(wps_ie, &in_ie[cnt], in_ie[cnt+1]+2);
 413                         *wps_ielen = in_ie[cnt+1]+2;
 414                         cnt += in_ie[cnt+1]+2;
 415                         match = true;
 416                         break;
 417                 } else
 418                         cnt += in_ie[cnt+1]+2; /* goto next */
 419         }
 420         return match;
 421 }