kernel/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                 }
 128                 tmp = *(p + 1);
 129                 p += (tmp + 2);
 130                 i += (tmp + 2);
 131                 if (i >= limit)
 132                         break;
 133         }
 134         return NULL;
 135 }
 136
 137 static void set_supported_rate(u8 *SupportedRates, uint mode)
 138 {
 139         memset(SupportedRates, 0, NDIS_802_11_LENGTH_RATES_EX);
 140         switch (mode) {
 141         case WIRELESS_11B:
 142                 memcpy(SupportedRates, WIFI_CCKRATES,
 143                         IEEE80211_CCK_RATE_LEN);
 144                 break;
 145         case WIRELESS_11G:
 146         case WIRELESS_11A:
 147                 memcpy(SupportedRates, WIFI_OFDMRATES,
 148                         IEEE80211_NUM_OFDM_RATESLEN);
 149                 break;
 150         case WIRELESS_11BG:
 151                 memcpy(SupportedRates, WIFI_CCKRATES, IEEE80211_CCK_RATE_LEN);
 152                 memcpy(SupportedRates + IEEE80211_CCK_RATE_LEN, WIFI_OFDMRATES,
 153                         IEEE80211_NUM_OFDM_RATESLEN);
 154                 break;
 155         }
 156 }
 157
 158 static uint r8712_get_rateset_len(u8 *rateset)
 159 {
 160         uint i = 0;
 161
 162         while (1) {
 163                 if ((rateset[i]) == 0)
 164                         break;
 165                 if (i > 12)
 166                         break;
 167                 i++;
 168         }
 169         return i;
 170 }
 171
 172 int r8712_generate_ie(struct registry_priv *pregistrypriv)
 173 {
 174         int sz = 0, rateLen;
 175         struct wlan_bssid_ex *pdev_network = &pregistrypriv->dev_network;
 176         u8 *ie = pdev_network->IEs;
 177
 178         /*timestamp will be inserted by hardware*/
 179         sz += 8;
 180         ie += sz;
 181         /*beacon interval : 2bytes*/
 182         *(u16 *)ie = cpu_to_le16((u16)pdev_network->Configuration.BeaconPeriod);
 183         sz += 2;
 184         ie += 2;
 185         /*capability info*/
 186         *(u16 *)ie = 0;
 187         *(u16 *)ie |= cpu_to_le16(cap_IBSS);
 188         if (pregistrypriv->preamble == PREAMBLE_SHORT)
 189                 *(u16 *)ie |= cpu_to_le16(cap_ShortPremble);
 190         if (pdev_network->Privacy)
 191                 *(u16 *)ie |= cpu_to_le16(cap_Privacy);
 192         sz += 2;
 193         ie += 2;
 194         /*SSID*/
 195         ie = r8712_set_ie(ie, _SSID_IE_, pdev_network->Ssid.SsidLength,
 196                     pdev_network->Ssid.Ssid, &sz);
 197         /*supported rates*/
 198         set_supported_rate(pdev_network->SupportedRates,
 199                            pregistrypriv->wireless_mode);
 200         rateLen = r8712_get_rateset_len(pdev_network->SupportedRates);
 201         if (rateLen > 8) {
 202                 ie = r8712_set_ie(ie, _SUPPORTEDRATES_IE_, 8,
 203                             pdev_network->SupportedRates, &sz);
 204                 ie = r8712_set_ie(ie, _EXT_SUPPORTEDRATES_IE_, (rateLen - 8),
 205                             (pdev_network->SupportedRates + 8), &sz);
 206         } else
 207                 ie = r8712_set_ie(ie, _SUPPORTEDRATES_IE_,
 208                             rateLen, pdev_network->SupportedRates, &sz);
 209         /*DS parameter set*/
 210         ie = r8712_set_ie(ie, _DSSET_IE_, 1,
 211                     (u8 *)&(pdev_network->Configuration.DSConfig), &sz);
 212         /*IBSS Parameter Set*/
 213         ie = r8712_set_ie(ie, _IBSS_PARA_IE_, 2,
 214                     (u8 *)&(pdev_network->Configuration.ATIMWindow), &sz);
 215         return sz;
 216 }
 217
 218 unsigned char *r8712_get_wpa_ie(unsigned char *pie, int *wpa_ie_len, int limit)
 219 {
 220         int len;
 221         u16 val16;
 222         unsigned char wpa_oui_type[] = {0x00, 0x50, 0xf2, 0x01};
 223         u8 *pbuf = pie;
 224
 225         while (1) {
 226                 pbuf = r8712_get_ie(pbuf, _WPA_IE_ID_, &len, limit);
 227                 if (pbuf) {
 228                         /*check if oui matches...*/
 229                         if (memcmp((pbuf + 2), wpa_oui_type,
 230                             sizeof(wpa_oui_type)))
 231                                 goto check_next_ie;
 232                         /*check version...*/
 233                         memcpy((u8 *)&val16, (pbuf + 6), sizeof(val16));
 234                         val16 = le16_to_cpu(val16);
 235                         if (val16 != 0x0001)
 236                                 goto check_next_ie;
 237                         *wpa_ie_len = *(pbuf + 1);
 238                         return pbuf;
 239                 }
 240                 *wpa_ie_len = 0;
 241                 return NULL;
 242 check_next_ie:
 243                 limit = limit - (pbuf - pie) - 2 - len;
 244                 if (limit <= 0)
 245                         break;
 246                 pbuf += (2 + len);
 247         }
 248         *wpa_ie_len = 0;
 249         return NULL;
 250 }
 251
 252 unsigned char *r8712_get_wpa2_ie(unsigned char *pie, int *rsn_ie_len, int limit)
 253 {
 254         return r8712_get_ie(pie, _WPA2_IE_ID_, rsn_ie_len, limit);
 255 }
 256
 257 static int r8712_get_wpa_cipher_suite(u8 *s)
 258 {
 259         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_NONE, WPA_SELECTOR_LEN))
 260                 return WPA_CIPHER_NONE;
 261         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_WEP40, WPA_SELECTOR_LEN))
 262                 return WPA_CIPHER_WEP40;
 263         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_TKIP, WPA_SELECTOR_LEN))
 264                 return WPA_CIPHER_TKIP;
 265         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_CCMP, WPA_SELECTOR_LEN))
 266                 return WPA_CIPHER_CCMP;
 267         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_WEP104, WPA_SELECTOR_LEN))
 268                 return WPA_CIPHER_WEP104;
 269         return 0;
 270 }
 271
 272 static int r8712_get_wpa2_cipher_suite(u8 *s)
 273 {
 274         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_NONE, RSN_SELECTOR_LEN))
 275                 return WPA_CIPHER_NONE;
 276         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_WEP40, RSN_SELECTOR_LEN))
 277                 return WPA_CIPHER_WEP40;
 278         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_TKIP, RSN_SELECTOR_LEN))
 279                 return WPA_CIPHER_TKIP;
 280         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_CCMP, RSN_SELECTOR_LEN))
 281                 return WPA_CIPHER_CCMP;
 282         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_WEP104, RSN_SELECTOR_LEN))
 283                 return WPA_CIPHER_WEP104;
 284         return 0;
 285 }
 286
 287 int r8712_parse_wpa_ie(u8 *wpa_ie, int wpa_ie_len, int *group_cipher,
 288                  int *pairwise_cipher)
 289 {
 290         int i;
 291         int left, count;
 292         u8 *pos;
 293
 294         if (wpa_ie_len <= 0) {
 295                 /* No WPA IE - fail silently */
 296                 return _FAIL;
 297         }
 298         if ((*wpa_ie != _WPA_IE_ID_) || (*(wpa_ie + 1) != (u8)(wpa_ie_len - 2))
 299              || (memcmp(wpa_ie + 2, (void *)WPA_OUI_TYPE, WPA_SELECTOR_LEN)))
 300                 return _FAIL;
 301         pos = wpa_ie;
 302         pos += 8;
 303         left = wpa_ie_len - 8;
 304         /*group_cipher*/
 305         if (left >= WPA_SELECTOR_LEN) {
 306                 *group_cipher = r8712_get_wpa_cipher_suite(pos);
 307                 pos += WPA_SELECTOR_LEN;
 308                 left -= WPA_SELECTOR_LEN;
 309         } else if (left > 0)
 310                 return _FAIL;
 311         /*pairwise_cipher*/
 312         if (left >= 2) {
 313                 count = le16_to_cpu(*(u16 *)pos);
 314                 pos += 2;
 315                 left -= 2;
 316                 if (count == 0 || left < count * WPA_SELECTOR_LEN)
 317                         return _FAIL;
 318                 for (i = 0; i < count; i++) {
 319                         *pairwise_cipher |= r8712_get_wpa_cipher_suite(pos);
 320                         pos += WPA_SELECTOR_LEN;
 321                         left -= WPA_SELECTOR_LEN;
 322                 }
 323         } else if (left == 1)
 324                 return _FAIL;
 325         return _SUCCESS;
 326 }
 327
 328 int r8712_parse_wpa2_ie(u8 *rsn_ie, int rsn_ie_len, int *group_cipher,
 329                   int *pairwise_cipher)
 330 {
 331         int i;
 332         int left, count;
 333         u8 *pos;
 334
 335         if (rsn_ie_len <= 0) {
 336                 /* No RSN IE - fail silently */
 337                 return _FAIL;
 338         }
 339         if ((*rsn_ie != _WPA2_IE_ID_) || (*(rsn_ie+1) != (u8)(rsn_ie_len - 2)))
 340                 return _FAIL;
 341         pos = rsn_ie;
 342         pos += 4;
 343         left = rsn_ie_len - 4;
 344         /*group_cipher*/
 345         if (left >= RSN_SELECTOR_LEN) {
 346                 *group_cipher = r8712_get_wpa2_cipher_suite(pos);
 347                 pos += RSN_SELECTOR_LEN;
 348                 left -= RSN_SELECTOR_LEN;
 349         } else if (left > 0)
 350                 return _FAIL;
 351         /*pairwise_cipher*/
 352         if (left >= 2) {
 353                 count = le16_to_cpu(*(u16 *)pos);
 354                 pos += 2;
 355                 left -= 2;
 356                 if (count == 0 || left < count * RSN_SELECTOR_LEN)
 357                         return _FAIL;
 358                 for (i = 0; i < count; i++) {
 359                         *pairwise_cipher |= r8712_get_wpa2_cipher_suite(pos);
 360                         pos += RSN_SELECTOR_LEN;
 361                         left -= RSN_SELECTOR_LEN;
 362                 }
 363         } else if (left == 1)
 364                 return _FAIL;
 365         return _SUCCESS;
 366 }
 367
 368 int r8712_get_sec_ie(u8 *in_ie, uint in_len, u8 *rsn_ie, u16 *rsn_len,
 369                u8 *wpa_ie, u16 *wpa_len)
 370 {
 371         u8 authmode;
 372         u8 wpa_oui[4] = {0x0, 0x50, 0xf2, 0x01};
 373         uint cnt;
 374
 375         /*Search required WPA or WPA2 IE and copy to sec_ie[ ]*/
 376         cnt = (_TIMESTAMP_ + _BEACON_ITERVAL_ + _CAPABILITY_);
 377         while (cnt < in_len) {
 378                 authmode = in_ie[cnt];
 379                 if ((authmode == _WPA_IE_ID_) &&
 380                     (!memcmp(&in_ie[cnt + 2], &wpa_oui[0], 4))) {
 381                         memcpy(wpa_ie, &in_ie[cnt], in_ie[cnt + 1] + 2);
 382                         *wpa_len = in_ie[cnt+1]+2;
 383                         cnt += in_ie[cnt + 1] + 2;  /*get next */
 384                 } else {
 385                         if (authmode == _WPA2_IE_ID_) {
 386                                 memcpy(rsn_ie, &in_ie[cnt],
 387                                         in_ie[cnt + 1] + 2);
 388                                 *rsn_len = in_ie[cnt+1] + 2;
 389                                 cnt += in_ie[cnt+1] + 2;  /*get next*/
 390                         } else
 391                                 cnt += in_ie[cnt+1] + 2;   /*get next*/
 392                 }
 393         }
 394         return *rsn_len + *wpa_len;
 395 }
 396
 397 int r8712_get_wps_ie(u8 *in_ie, uint in_len, u8 *wps_ie, uint *wps_ielen)
 398 {
 399         int match;
 400         uint cnt;
 401         u8 eid, wps_oui[4] = {0x0, 0x50, 0xf2, 0x04};
 402
 403         cnt = 12;
 404         match = false;
 405         while (cnt < in_len) {
 406                 eid = in_ie[cnt];
 407                 if ((eid == _WPA_IE_ID_) &&
 408                     (!memcmp(&in_ie[cnt+2], wps_oui, 4))) {
 409                         memcpy(wps_ie, &in_ie[cnt], in_ie[cnt+1]+2);
 410                         *wps_ielen = in_ie[cnt+1]+2;
 411                         cnt += in_ie[cnt+1]+2;
 412                         match = true;
 413                         break;
 414                 }
 415                         cnt += in_ie[cnt+1]+2; /* goto next */
 416         }
 417         return match;
 418 }