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ieee80211.c
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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 <[email protected]>.
25  * Larry Finger <[email protected]>
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 }
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