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
 173         /*timestamp will be inserted by hardware*/
 174         sz += 8;
 175         ie += sz;
 176         /*beacon interval : 2bytes*/
 177         *(__le16 *)ie = cpu_to_le16((u16)pdev_network->Configuration.BeaconPeriod);
 178         sz += 2;
 179         ie += 2;
 180         /*capability info*/
 181         *(u16 *)ie = 0;
 182         *(__le16 *)ie |= cpu_to_le16(cap_IBSS);
 183         if (pregistrypriv->preamble == PREAMBLE_SHORT)
 184                 *(__le16 *)ie |= cpu_to_le16(cap_ShortPremble);
 185         if (pdev_network->Privacy)
 186                 *(__le16 *)ie |= cpu_to_le16(cap_Privacy);
 187         sz += 2;
 188         ie += 2;
 189         /*SSID*/
 190         ie = r8712_set_ie(ie, _SSID_IE_, pdev_network->Ssid.SsidLength,
 191                           pdev_network->Ssid.Ssid, &sz);
 192         /*supported rates*/
 193         set_supported_rate(pdev_network->rates, pregistrypriv->wireless_mode);
 194         rate_len = r8712_get_rateset_len(pdev_network->rates);
 195         if (rate_len > 8) {
 196                 ie = r8712_set_ie(ie, _SUPPORTEDRATES_IE_, 8,
 197                                   pdev_network->rates, &sz);
 198                 ie = r8712_set_ie(ie, _EXT_SUPPORTEDRATES_IE_, (rate_len - 8),
 199                                   (pdev_network->rates + 8), &sz);
 200         } else {
 201                 ie = r8712_set_ie(ie, _SUPPORTEDRATES_IE_,
 202                                   rate_len, pdev_network->rates, &sz);
 203         }
 204         /*DS parameter set*/
 205         ie = r8712_set_ie(ie, _DSSET_IE_, 1,
 206                           (u8 *)&pdev_network->Configuration.DSConfig, &sz);
 207         /*IBSS Parameter Set*/
 208         ie = r8712_set_ie(ie, _IBSS_PARA_IE_, 2,
 209                           (u8 *)&pdev_network->Configuration.ATIMWindow, &sz);
 210         return sz;
 211 }
 212
 213 unsigned char *r8712_get_wpa_ie(unsigned char *pie, int *wpa_ie_len, int limit)
 214 {
 215         int len;
 216         u16 val16;
 217         unsigned char wpa_oui_type[] = {0x00, 0x50, 0xf2, 0x01};
 218         u8 *pbuf = pie;
 219
 220         while (1) {
 221                 pbuf = r8712_get_ie(pbuf, _WPA_IE_ID_, &len, limit);
 222                 if (pbuf) {
 223                         /*check if oui matches...*/
 224                         if (memcmp((pbuf + 2), wpa_oui_type, sizeof(wpa_oui_type)))
 225                                 goto check_next_ie;
 226                         /*check version...*/
 227                         memcpy((u8 *)&val16, (pbuf + 6), sizeof(val16));
 228                         le16_to_cpus(&val16);
 229                         if (val16 != 0x0001)
 230                                 goto check_next_ie;
 231                         *wpa_ie_len = *(pbuf + 1);
 232                         return pbuf;
 233                 }
 234                 *wpa_ie_len = 0;
 235                 return NULL;
 236 check_next_ie:
 237                 limit = limit - (pbuf - pie) - 2 - len;
 238                 if (limit <= 0)
 239                         break;
 240                 pbuf += (2 + len);
 241         }
 242         *wpa_ie_len = 0;
 243         return NULL;
 244 }
 245
 246 unsigned char *r8712_get_wpa2_ie(unsigned char *pie, int *rsn_ie_len, int limit)
 247 {
 248         return r8712_get_ie(pie, _WPA2_IE_ID_, rsn_ie_len, limit);
 249 }
 250
 251 static int r8712_get_wpa_cipher_suite(u8 *s)
 252 {
 253         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_NONE, WPA_SELECTOR_LEN))
 254                 return WPA_CIPHER_NONE;
 255         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_WEP40, WPA_SELECTOR_LEN))
 256                 return WPA_CIPHER_WEP40;
 257         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_TKIP, WPA_SELECTOR_LEN))
 258                 return WPA_CIPHER_TKIP;
 259         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_CCMP, WPA_SELECTOR_LEN))
 260                 return WPA_CIPHER_CCMP;
 261         if (!memcmp(s, (void *)WPA_CIPHER_SUITE_WEP104, WPA_SELECTOR_LEN))
 262                 return WPA_CIPHER_WEP104;
 263         return 0;
 264 }
 265
 266 static int r8712_get_wpa2_cipher_suite(u8 *s)
 267 {
 268         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_NONE, RSN_SELECTOR_LEN))
 269                 return WPA_CIPHER_NONE;
 270         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_WEP40, RSN_SELECTOR_LEN))
 271                 return WPA_CIPHER_WEP40;
 272         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_TKIP, RSN_SELECTOR_LEN))
 273                 return WPA_CIPHER_TKIP;
 274         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_CCMP, RSN_SELECTOR_LEN))
 275                 return WPA_CIPHER_CCMP;
 276         if (!memcmp(s, (void *)RSN_CIPHER_SUITE_WEP104, RSN_SELECTOR_LEN))
 277                 return WPA_CIPHER_WEP104;
 278         return 0;
 279 }
 280
 281 int r8712_parse_wpa_ie(u8 *wpa_ie, int wpa_ie_len, int *group_cipher,
 282                        int *pairwise_cipher)
 283 {
 284         int i;
 285         int left, count;
 286         u8 *pos;
 287
 288         if (wpa_ie_len <= 0) {
 289                 /* No WPA IE - fail silently */
 290                 return _FAIL;
 291         }
 292         if ((*wpa_ie != _WPA_IE_ID_) ||
 293             (*(wpa_ie + 1) != (u8)(wpa_ie_len - 2)) ||
 294             (memcmp(wpa_ie + 2, (void *)WPA_OUI_TYPE, WPA_SELECTOR_LEN)))
 295                 return _FAIL;
 296         pos = wpa_ie;
 297         pos += 8;
 298         left = wpa_ie_len - 8;
 299         /*group_cipher*/
 300         if (left >= WPA_SELECTOR_LEN) {
 301                 *group_cipher = r8712_get_wpa_cipher_suite(pos);
 302                 pos += WPA_SELECTOR_LEN;
 303                 left -= WPA_SELECTOR_LEN;
 304         } else if (left > 0) {
 305                 return _FAIL;
 306         }
 307         /*pairwise_cipher*/
 308         if (left >= 2) {
 309                 count = le16_to_cpu(*(__le16 *)pos);
 310                 pos += 2;
 311                 left -= 2;
 312                 if (count == 0 || left < count * WPA_SELECTOR_LEN)
 313                         return _FAIL;
 314                 for (i = 0; i < count; i++) {
 315                         *pairwise_cipher |= r8712_get_wpa_cipher_suite(pos);
 316                         pos += WPA_SELECTOR_LEN;
 317                         left -= WPA_SELECTOR_LEN;
 318                 }
 319         } else if (left == 1) {
 320                 return _FAIL;
 321         }
 322         return _SUCCESS;
 323 }
 324
 325 int r8712_parse_wpa2_ie(u8 *rsn_ie, int rsn_ie_len, int *group_cipher,
 326                         int *pairwise_cipher)
 327 {
 328         int i;
 329         int left, count;
 330         u8 *pos;
 331
 332         if (rsn_ie_len <= 0) {
 333                 /* No RSN IE - fail silently */
 334                 return _FAIL;
 335         }
 336         if ((*rsn_ie != _WPA2_IE_ID_) ||
 337             (*(rsn_ie + 1) != (u8)(rsn_ie_len - 2)))
 338                 return _FAIL;
 339         pos = rsn_ie;
 340         pos += 4;
 341         left = rsn_ie_len - 4;
 342         /*group_cipher*/
 343         if (left >= RSN_SELECTOR_LEN) {
 344                 *group_cipher = r8712_get_wpa2_cipher_suite(pos);
 345                 pos += RSN_SELECTOR_LEN;
 346                 left -= RSN_SELECTOR_LEN;
 347         } else if (left > 0) {
 348                 return _FAIL;
 349         }
 350         /*pairwise_cipher*/
 351         if (left >= 2) {
 352                 count = le16_to_cpu(*(__le16 *)pos);
 353                 pos += 2;
 354                 left -= 2;
 355                 if (count == 0 || left < count * RSN_SELECTOR_LEN)
 356                         return _FAIL;
 357                 for (i = 0; i < count; i++) {
 358                         *pairwise_cipher |= r8712_get_wpa2_cipher_suite(pos);
 359                         pos += RSN_SELECTOR_LEN;
 360                         left -= RSN_SELECTOR_LEN;
 361                 }
 362         } else if (left == 1) {
 363                 return _FAIL;
 364         }
 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         }
 395         return *rsn_len + *wpa_len;
 396 }
 397
 398 int r8712_get_wps_ie(u8 *in_ie, uint in_len, u8 *wps_ie, uint *wps_ielen)
 399 {
 400         int match;
 401         uint cnt;
 402         u8 eid, wps_oui[4] = {0x0, 0x50, 0xf2, 0x04};
 403
 404         cnt = 12;
 405         match = false;
 406         while (cnt < in_len) {
 407                 eid = in_ie[cnt];
 408                 if ((eid == _WPA_IE_ID_) &&
 409                     (!memcmp(&in_ie[cnt + 2], wps_oui, 4))) {
 410                         memcpy(wps_ie, &in_ie[cnt], in_ie[cnt + 1] + 2);
 411                         *wps_ielen = in_ie[cnt + 1] + 2;
 412                         cnt += in_ie[cnt + 1] + 2;
 413                         match = true;
 414                         break;
 415                 }
 416                         cnt += in_ie[cnt + 1] + 2; /* goto next */
 417         }
 418         return match;
 419 }