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  * Modifications for inclusion into the Linux staging tree are
  17  * Copyright(c) 2010 Larry Finger. All rights reserved.
  18  *
  19  * Contact information:
  20  * WLAN FAE <wlanfae@realtek.com>.
  21  * Larry Finger <Larry.Finger@lwfinger.net>
  22  *
  23  ******************************************************************************/
  24
  25 #define _IEEE80211_C
  26
  27 #include "drv_types.h"
  28 #include "ieee80211.h"
  29 #include "wifi.h"
  30 #include "osdep_service.h"
  31 #include "wlan_bssdef.h"
  32
  33 static const u8 WPA_OUI_TYPE[] = {0x00, 0x50, 0xf2, 1};
  34 static const u8 WPA_CIPHER_SUITE_NONE[] = {0x00, 0x50, 0xf2, 0};
  35 static const u8 WPA_CIPHER_SUITE_WEP40[] = {0x00, 0x50, 0xf2, 1};
  36 static const u8 WPA_CIPHER_SUITE_TKIP[] = {0x00, 0x50, 0xf2, 2};
  37 static const u8 WPA_CIPHER_SUITE_CCMP[] = {0x00, 0x50, 0xf2, 4};
  38 static const u8 WPA_CIPHER_SUITE_WEP104[] = {0x00, 0x50, 0xf2, 5};
  39
  40 static const u8 RSN_CIPHER_SUITE_NONE[] = {0x00, 0x0f, 0xac, 0};
  41 static const u8 RSN_CIPHER_SUITE_WEP40[] = {0x00, 0x0f, 0xac, 1};
  42 static const u8 RSN_CIPHER_SUITE_TKIP[] = {0x00, 0x0f, 0xac, 2};
  43 static const u8 RSN_CIPHER_SUITE_CCMP[] = {0x00, 0x0f, 0xac, 4};
  44 static const u8 RSN_CIPHER_SUITE_WEP104[] = {0x00, 0x0f, 0xac, 5};
  45
  46 /*-----------------------------------------------------------
  47  * for adhoc-master to generate ie and provide supported-rate to fw
  48  *-----------------------------------------------------------
  49  */
  50
  51 static u8 WIFI_CCKRATES[] =  {
  52         (IEEE80211_CCK_RATE_1MB | IEEE80211_BASIC_RATE_MASK),
  53         (IEEE80211_CCK_RATE_2MB | IEEE80211_BASIC_RATE_MASK),
  54         (IEEE80211_CCK_RATE_5MB | IEEE80211_BASIC_RATE_MASK),
  55         (IEEE80211_CCK_RATE_11MB | IEEE80211_BASIC_RATE_MASK)
  56 };
  57
  58 static u8 WIFI_OFDMRATES[] = {
  59         (IEEE80211_OFDM_RATE_6MB),
  60         (IEEE80211_OFDM_RATE_9MB),
  61         (IEEE80211_OFDM_RATE_12MB),
  62         (IEEE80211_OFDM_RATE_18MB),
  63         (IEEE80211_OFDM_RATE_24MB),
  64         (IEEE80211_OFDM_RATE_36MB),
  65         (IEEE80211_OFDM_RATE_48MB),
  66         (IEEE80211_OFDM_RATE_54MB)
  67 };
  68
  69 uint r8712_is_cckrates_included(u8 *rate)
  70 {
  71         u32 i = 0;
  72
  73         while (rate[i] != 0) {
  74                 if ((((rate[i]) & 0x7f) == 2) || (((rate[i]) & 0x7f) == 4) ||
  75                     (((rate[i]) & 0x7f) == 11) || (((rate[i]) & 0x7f) == 22))
  76                         return true;
  77                 i++;
  78         }
  79         return false;
  80 }
  81
  82 uint r8712_is_cckratesonly_included(u8 *rate)
  83 {
  84         u32 i = 0;
  85
  86         while (rate[i] != 0) {
  87                 if ((((rate[i]) & 0x7f) != 2) && (((rate[i]) & 0x7f) != 4) &&
  88                     (((rate[i]) & 0x7f) != 11)  && (((rate[i]) & 0x7f) != 22))
  89                         return false;
  90                 i++;
  91         }
  92         return true;
  93 }
  94
  95 /* r8712_set_ie will update frame length */
  96 u8 *r8712_set_ie(u8 *pbuf, sint index, uint len, u8 *source, uint *frlen)
  97 {
  98         *pbuf = (u8)index;
  99         *(pbuf + 1) = (u8)len;
 100         if (len > 0)
 101                 memcpy((void *)(pbuf + 2), (void *)source, len);
 102         *frlen = *frlen + (len + 2);
 103         return pbuf + len + 2;
 104 }
 105
 106 /* ---------------------------------------------------------------------------
 107  * index: the information element id index, limit is the limit for search
 108  * ---------------------------------------------------------------------------
 109  */
 110 u8 *r8712_get_ie(u8 *pbuf, sint index, sint *len, sint limit)
 111 {
 112         sint tmp, i;
 113         u8 *p;
 114
 115         if (limit < 1)
 116                 return NULL;
 117         p = pbuf;
 118         i = 0;
 119         *len = 0;
 120         while (1) {
 121                 if (*p == index) {
 122                         *len = *(p + 1);
 123                         return p;
 124                 }
 125                 tmp = *(p + 1);
 126                 p += (tmp + 2);
 127                 i += (tmp + 2);
 128                 if (i >= limit)
 129                         break;
 130         }
 131         return NULL;
 132 }
 133
 134 static void set_supported_rate(u8 *rates, uint mode)
 135 {
 136         memset(rates, 0, NDIS_802_11_LENGTH_RATES_EX);
 137         switch (mode) {
 138         case WIRELESS_11B:
 139                 memcpy(rates, WIFI_CCKRATES, IEEE80211_CCK_RATE_LEN);
 140                 break;
 141         case WIRELESS_11G:
 142         case WIRELESS_11A:
 143                 memcpy(rates, WIFI_OFDMRATES, IEEE80211_NUM_OFDM_RATESLEN);
 144                 break;
 145         case WIRELESS_11BG:
 146                 memcpy(rates, WIFI_CCKRATES, IEEE80211_CCK_RATE_LEN);
 147                 memcpy(rates + IEEE80211_CCK_RATE_LEN, WIFI_OFDMRATES,
 148                        IEEE80211_NUM_OFDM_RATESLEN);
 149                 break;
 150         }
 151 }
 152
 153 static uint r8712_get_rateset_len(u8 *rateset)
 154 {
 155         uint i = 0;
 156
 157         while (1) {
 158                 if ((rateset[i]) == 0)
 159                         break;
 160                 if (i > 12)
 161                         break;
 162                 i++;
 163         }
 164         return i;
 165 }
 166
 167 int r8712_generate_ie(struct registry_priv *pregistrypriv)
 168 {
 169         int sz = 0, rate_len;
 170         struct wlan_bssid_ex *pdev_network = &pregistrypriv->dev_network;
 171         u8 *ie = pdev_network->IEs;
 172         u16 beaconPeriod = (u16)pdev_network->Configuration.BeaconPeriod;
 173
 174         /*timestamp will be inserted by hardware*/
 175         sz += 8;
 176         ie += sz;
 177         /*beacon interval : 2bytes*/
 178         *(__le16 *)ie = cpu_to_le16(beaconPeriod);
 179         sz += 2;
 180         ie += 2;
 181         /*capability info*/
 182         *(u16 *)ie = 0;
 183         *(__le16 *)ie |= cpu_to_le16(cap_IBSS);
 184         if (pregistrypriv->preamble == PREAMBLE_SHORT)
 185                 *(__le16 *)ie |= cpu_to_le16(cap_ShortPremble);
 186         if (pdev_network->Privacy)
 187                 *(__le16 *)ie |= cpu_to_le16(cap_Privacy);
 188         sz += 2;
 189         ie += 2;
 190         /*SSID*/
 191         ie = r8712_set_ie(ie, _SSID_IE_, pdev_network->Ssid.SsidLength,
 192                           pdev_network->Ssid.Ssid, &sz);
 193         /*supported rates*/
 194         set_supported_rate(pdev_network->rates, pregistrypriv->wireless_mode);
 195         rate_len = r8712_get_rateset_len(pdev_network->rates);
 196         if (rate_len > 8) {
 197                 ie = r8712_set_ie(ie, _SUPPORTEDRATES_IE_, 8,
 198                                   pdev_network->rates, &sz);
 199                 ie = r8712_set_ie(ie, _EXT_SUPPORTEDRATES_IE_, (rate_len - 8),
 200                                   (pdev_network->rates + 8), &sz);
 201         } else {
 202                 ie = r8712_set_ie(ie, _SUPPORTEDRATES_IE_,
 203                                   rate_len, pdev_network->rates, &sz);
 204         }
 205         /*DS parameter set*/
 206         ie = r8712_set_ie(ie, _DSSET_IE_, 1,
 207                           (u8 *)&pdev_network->Configuration.DSConfig, &sz);
 208         /*IBSS Parameter Set*/
 209         ie = r8712_set_ie(ie, _IBSS_PARA_IE_, 2,
 210                           (u8 *)&pdev_network->Configuration.ATIMWindow, &sz);
 211         return sz;
 212 }
 213
 214 unsigned char *r8712_get_wpa_ie(unsigned char *pie, int *wpa_ie_len, int limit)
 215 {
 216         int len;
 217         u16 val16;
 218         unsigned char wpa_oui_type[] = {0x00, 0x50, 0xf2, 0x01};
 219         u8 *pbuf = pie;
 220
 221         while (1) {
 222                 pbuf = r8712_get_ie(pbuf, _WPA_IE_ID_, &len, limit);
 223                 if (pbuf) {
 224                         /*check if oui matches...*/
 225                         if (memcmp((pbuf + 2), wpa_oui_type,
 226                                    sizeof(wpa_oui_type)))
 227                                 goto check_next_ie;
 228                         /*check version...*/
 229                         memcpy((u8 *)&val16, (pbuf + 6), sizeof(val16));
 230                         le16_to_cpus(&val16);
 231                         if (val16 != 0x0001)
 232                                 goto check_next_ie;
 233                         *wpa_ie_len = *(pbuf + 1);
 234                         return pbuf;
 235                 }
 236                 *wpa_ie_len = 0;
 237                 return NULL;
 238 check_next_ie:
 239                 limit = limit - (pbuf - pie) - 2 - len;
 240                 if (limit <= 0)
 241                         break;
 242                 pbuf += (2 + len);
 243         }
 244         *wpa_ie_len = 0;
 245         return NULL;
 246 }
 247
 248 unsigned char *r8712_get_wpa2_ie(unsigned char *pie, int *rsn_ie_len, int limit)
 249 {
 250         return r8712_get_ie(pie, _WPA2_IE_ID_, rsn_ie_len, limit);
 251 }
 252
 253 static int r8712_get_wpa_cipher_suite(u8 *s)
 254 {
 255         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_NONE, WPA_SELECTOR_LEN))
 256                 return WPA_CIPHER_NONE;
 257         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_WEP40, WPA_SELECTOR_LEN))
 258                 return WPA_CIPHER_WEP40;
 259         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_TKIP, WPA_SELECTOR_LEN))
 260                 return WPA_CIPHER_TKIP;
 261         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_CCMP, WPA_SELECTOR_LEN))
 262                 return WPA_CIPHER_CCMP;
 263         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_WEP104, WPA_SELECTOR_LEN))
 264                 return WPA_CIPHER_WEP104;
 265         return 0;
 266 }
 267
 268 static int r8712_get_wpa2_cipher_suite(u8 *s)
 269 {
 270         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_NONE, RSN_SELECTOR_LEN))
 271                 return WPA_CIPHER_NONE;
 272         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_WEP40, RSN_SELECTOR_LEN))
 273                 return WPA_CIPHER_WEP40;
 274         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_TKIP, RSN_SELECTOR_LEN))
 275                 return WPA_CIPHER_TKIP;
 276         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_CCMP, RSN_SELECTOR_LEN))
 277                 return WPA_CIPHER_CCMP;
 278         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_WEP104, RSN_SELECTOR_LEN))
 279                 return WPA_CIPHER_WEP104;
 280         return 0;
 281 }
 282
 283 int r8712_parse_wpa_ie(u8 *wpa_ie, int wpa_ie_len, int *group_cipher,
 284                        int *pairwise_cipher)
 285 {
 286         int i;
 287         int left, count;
 288         u8 *pos;
 289
 290         if (wpa_ie_len <= 0) {
 291                 /* No WPA IE - fail silently */
 292                 return _FAIL;
 293         }
 294         if ((*wpa_ie != _WPA_IE_ID_) ||
 295             (*(wpa_ie + 1) != (u8)(wpa_ie_len - 2)) ||
 296             (memcmp(wpa_ie + 2, (void *)WPA_OUI_TYPE, WPA_SELECTOR_LEN)))
 297                 return _FAIL;
 298         pos = wpa_ie;
 299         pos += 8;
 300         left = wpa_ie_len - 8;
 301         /*group_cipher*/
 302         if (left >= WPA_SELECTOR_LEN) {
 303                 *group_cipher = r8712_get_wpa_cipher_suite(pos);
 304                 pos += WPA_SELECTOR_LEN;
 305                 left -= WPA_SELECTOR_LEN;
 306         } else if (left > 0) {
 307                 return _FAIL;
 308         }
 309         /*pairwise_cipher*/
 310         if (left >= 2) {
 311                 count = le16_to_cpu(*(__le16 *)pos);
 312                 pos += 2;
 313                 left -= 2;
 314                 if (count == 0 || left < count * WPA_SELECTOR_LEN)
 315                         return _FAIL;
 316                 for (i = 0; i < count; i++) {
 317                         *pairwise_cipher |= r8712_get_wpa_cipher_suite(pos);
 318                         pos += WPA_SELECTOR_LEN;
 319                         left -= WPA_SELECTOR_LEN;
 320                 }
 321         } else if (left == 1) {
 322                 return _FAIL;
 323         }
 324         return _SUCCESS;
 325 }
 326
 327 int r8712_parse_wpa2_ie(u8 *rsn_ie, int rsn_ie_len, int *group_cipher,
 328                         int *pairwise_cipher)
 329 {
 330         int i;
 331         int left, count;
 332         u8 *pos;
 333
 334         if (rsn_ie_len <= 0) {
 335                 /* No RSN IE - fail silently */
 336                 return _FAIL;
 337         }
 338         if ((*rsn_ie != _WPA2_IE_ID_) ||
 339             (*(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         }
 352         /*pairwise_cipher*/
 353         if (left >= 2) {
 354                 count = le16_to_cpu(*(__le16 *)pos);
 355                 pos += 2;
 356                 left -= 2;
 357                 if (count == 0 || left < count * RSN_SELECTOR_LEN)
 358                         return _FAIL;
 359                 for (i = 0; i < count; i++) {
 360                         *pairwise_cipher |= r8712_get_wpa2_cipher_suite(pos);
 361                         pos += RSN_SELECTOR_LEN;
 362                         left -= RSN_SELECTOR_LEN;
 363                 }
 364         } else if (left == 1) {
 365                 return _FAIL;
 366         }
 367         return _SUCCESS;
 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;
 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         while (cnt < in_len) {
 380                 authmode = in_ie[cnt];
 381                 if ((authmode == _WPA_IE_ID_) &&
 382                     (!memcmp(&in_ie[cnt + 2], &wpa_oui[0], 4))) {
 383                         memcpy(wpa_ie, &in_ie[cnt], in_ie[cnt + 1] + 2);
 384                         *wpa_len = in_ie[cnt + 1] + 2;
 385                         cnt += in_ie[cnt + 1] + 2;  /*get next */
 386                 } else {
 387                         if (authmode == _WPA2_IE_ID_) {
 388                                 memcpy(rsn_ie, &in_ie[cnt],
 389                                        in_ie[cnt + 1] + 2);
 390                                 *rsn_len = in_ie[cnt + 1] + 2;
 391                                 cnt += in_ie[cnt + 1] + 2;  /*get next*/
 392                         } else {
 393                                 cnt += in_ie[cnt + 1] + 2;   /*get next*/
 394                         }
 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                 }
 418                         cnt += in_ie[cnt + 1] + 2; /* goto next */
 419         }
 420         return match;
 421 }