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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 <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
37static const u8 WPA_OUI_TYPE[] = {0x00, 0x50, 0xf2, 1};
38static const u8 WPA_CIPHER_SUITE_NONE[] = {0x00, 0x50, 0xf2, 0};
39static const u8 WPA_CIPHER_SUITE_WEP40[] = {0x00, 0x50, 0xf2, 1};
40static const u8 WPA_CIPHER_SUITE_TKIP[] = {0x00, 0x50, 0xf2, 2};
41static const u8 WPA_CIPHER_SUITE_CCMP[] = {0x00, 0x50, 0xf2, 4};
42static const u8 WPA_CIPHER_SUITE_WEP104[] = {0x00, 0x50, 0xf2, 5};
43
44static const u8 RSN_CIPHER_SUITE_NONE[] = {0x00, 0x0f, 0xac, 0};
45static const u8 RSN_CIPHER_SUITE_WEP40[] = {0x00, 0x0f, 0xac, 1};
46static const u8 RSN_CIPHER_SUITE_TKIP[] = {0x00, 0x0f, 0xac, 2};
47static const u8 RSN_CIPHER_SUITE_CCMP[] = {0x00, 0x0f, 0xac, 4};
48static 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
55static 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
62static 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
73uint 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
86uint 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 */
100u8 *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 */
114u8 *r8712_get_ie(u8 *pbuf, sint index, sint *len, sint limit)
115{
116 sint tmp, i;
117 u8 *p;
118
119 if (limit < 1)
120 return NULL;
121 p = pbuf;
122 i = 0;
123 *len = 0;
124 while (1) {
125 if (*p == index) {
126 *len = *(p + 1);
127 return p;
128 }
129 tmp = *(p + 1);
130 p += (tmp + 2);
131 i += (tmp + 2);
132 if (i >= limit)
133 break;
134 }
135 return NULL;
136}
137
138static void set_supported_rate(u8 *rates, uint mode)
139{
140 memset(rates, 0, NDIS_802_11_LENGTH_RATES_EX);
141 switch (mode) {
142 case WIRELESS_11B:
143 memcpy(rates, WIFI_CCKRATES, IEEE80211_CCK_RATE_LEN);
144 break;
145 case WIRELESS_11G:
146 case WIRELESS_11A:
147 memcpy(rates, WIFI_OFDMRATES, IEEE80211_NUM_OFDM_RATESLEN);
148 break;
149 case WIRELESS_11BG:
150 memcpy(rates, WIFI_CCKRATES, IEEE80211_CCK_RATE_LEN);
151 memcpy(rates + IEEE80211_CCK_RATE_LEN, WIFI_OFDMRATES,
152 IEEE80211_NUM_OFDM_RATESLEN);
153 break;
154 }
155}
156
157static uint r8712_get_rateset_len(u8 *rateset)
158{
159 uint i = 0;
160
161 while (1) {
162 if ((rateset[i]) == 0)
163 break;
164 if (i > 12)
165 break;
166 i++;
167 }
168 return i;
169}
170
171int r8712_generate_ie(struct registry_priv *pregistrypriv)
172{
173 int sz = 0, rateLen;
174 struct wlan_bssid_ex *pdev_network = &pregistrypriv->dev_network;
175 u8 *ie = pdev_network->IEs;
176
177 /*timestamp will be inserted by hardware*/
178 sz += 8;
179 ie += sz;
180 /*beacon interval : 2bytes*/
181 *(u16 *)ie = cpu_to_le16((u16)pdev_network->Configuration.BeaconPeriod);
182 sz += 2;
183 ie += 2;
184 /*capability info*/
185 *(u16 *)ie = 0;
186 *(u16 *)ie |= cpu_to_le16(cap_IBSS);
187 if (pregistrypriv->preamble == PREAMBLE_SHORT)
188 *(u16 *)ie |= cpu_to_le16(cap_ShortPremble);
189 if (pdev_network->Privacy)
190 *(u16 *)ie |= cpu_to_le16(cap_Privacy);
191 sz += 2;
192 ie += 2;
193 /*SSID*/
194 ie = r8712_set_ie(ie, _SSID_IE_, pdev_network->Ssid.SsidLength,
195 pdev_network->Ssid.Ssid, &sz);
196 /*supported rates*/
197 set_supported_rate(pdev_network->rates, pregistrypriv->wireless_mode);
198 rateLen = r8712_get_rateset_len(pdev_network->rates);
199 if (rateLen > 8) {
200 ie = r8712_set_ie(ie, _SUPPORTEDRATES_IE_, 8,
201 pdev_network->rates, &sz);
202 ie = r8712_set_ie(ie, _EXT_SUPPORTEDRATES_IE_, (rateLen - 8),
203 (pdev_network->rates + 8), &sz);
204 } else
205 ie = r8712_set_ie(ie, _SUPPORTEDRATES_IE_,
206 rateLen, pdev_network->rates, &sz);
207 /*DS parameter set*/
208 ie = r8712_set_ie(ie, _DSSET_IE_, 1,
209 (u8 *)&(pdev_network->Configuration.DSConfig), &sz);
210 /*IBSS Parameter Set*/
211 ie = r8712_set_ie(ie, _IBSS_PARA_IE_, 2,
212 (u8 *)&(pdev_network->Configuration.ATIMWindow), &sz);
213 return sz;
214}
215
216unsigned char *r8712_get_wpa_ie(unsigned char *pie, int *wpa_ie_len, int limit)
217{
218 int len;
219 u16 val16;
220 unsigned char wpa_oui_type[] = {0x00, 0x50, 0xf2, 0x01};
221 u8 *pbuf = pie;
222
223 while (1) {
224 pbuf = r8712_get_ie(pbuf, _WPA_IE_ID_, &len, limit);
225 if (pbuf) {
226 /*check if oui matches...*/
227 if (memcmp((pbuf + 2), wpa_oui_type,
228 sizeof(wpa_oui_type)))
229 goto check_next_ie;
230 /*check version...*/
231 memcpy((u8 *)&val16, (pbuf + 6), sizeof(val16));
232 val16 = le16_to_cpu(val16);
233 if (val16 != 0x0001)
234 goto check_next_ie;
235 *wpa_ie_len = *(pbuf + 1);
236 return pbuf;
237 }
238 *wpa_ie_len = 0;
239 return NULL;
240check_next_ie:
241 limit = limit - (pbuf - pie) - 2 - len;
242 if (limit <= 0)
243 break;
244 pbuf += (2 + len);
245 }
246 *wpa_ie_len = 0;
247 return NULL;
248}
249
250unsigned char *r8712_get_wpa2_ie(unsigned char *pie, int *rsn_ie_len, int limit)
251{
252 return r8712_get_ie(pie, _WPA2_IE_ID_, rsn_ie_len, limit);
253}
254
255static int r8712_get_wpa_cipher_suite(u8 *s)
256{
257 if (!memcmp(s, (void *)WPA_CIPHER_SUITE_NONE, WPA_SELECTOR_LEN))
258 return WPA_CIPHER_NONE;
259 if (!memcmp(s, (void *)WPA_CIPHER_SUITE_WEP40, WPA_SELECTOR_LEN))
260 return WPA_CIPHER_WEP40;
261 if (!memcmp(s, (void *)WPA_CIPHER_SUITE_TKIP, WPA_SELECTOR_LEN))
262 return WPA_CIPHER_TKIP;
263 if (!memcmp(s, (void *)WPA_CIPHER_SUITE_CCMP, WPA_SELECTOR_LEN))
264 return WPA_CIPHER_CCMP;
265 if (!memcmp(s, (void *)WPA_CIPHER_SUITE_WEP104, WPA_SELECTOR_LEN))
266 return WPA_CIPHER_WEP104;
267 return 0;
268}
269
270static int r8712_get_wpa2_cipher_suite(u8 *s)
271{
272 if (!memcmp(s, (void *)RSN_CIPHER_SUITE_NONE, RSN_SELECTOR_LEN))
273 return WPA_CIPHER_NONE;
274 if (!memcmp(s, (void *)RSN_CIPHER_SUITE_WEP40, RSN_SELECTOR_LEN))
275 return WPA_CIPHER_WEP40;
276 if (!memcmp(s, (void *)RSN_CIPHER_SUITE_TKIP, RSN_SELECTOR_LEN))
277 return WPA_CIPHER_TKIP;
278 if (!memcmp(s, (void *)RSN_CIPHER_SUITE_CCMP, RSN_SELECTOR_LEN))
279 return WPA_CIPHER_CCMP;
280 if (!memcmp(s, (void *)RSN_CIPHER_SUITE_WEP104, RSN_SELECTOR_LEN))
281 return WPA_CIPHER_WEP104;
282 return 0;
283}
284
285int r8712_parse_wpa_ie(u8 *wpa_ie, int wpa_ie_len, int *group_cipher,
286 int *pairwise_cipher)
287{
288 int i;
289 int left, count;
290 u8 *pos;
291
292 if (wpa_ie_len <= 0) {
293 /* No WPA IE - fail silently */
294 return _FAIL;
295 }
296 if ((*wpa_ie != _WPA_IE_ID_) || (*(wpa_ie + 1) != (u8)(wpa_ie_len - 2))
297 || (memcmp(wpa_ie + 2, (void *)WPA_OUI_TYPE, WPA_SELECTOR_LEN)))
298 return _FAIL;
299 pos = wpa_ie;
300 pos += 8;
301 left = wpa_ie_len - 8;
302 /*group_cipher*/
303 if (left >= WPA_SELECTOR_LEN) {
304 *group_cipher = r8712_get_wpa_cipher_suite(pos);
305 pos += WPA_SELECTOR_LEN;
306 left -= WPA_SELECTOR_LEN;
307 } else if (left > 0) {
308 return _FAIL;
309 }
310 /*pairwise_cipher*/
311 if (left >= 2) {
312 count = le16_to_cpu(*(u16 *)pos);
313 pos += 2;
314 left -= 2;
315 if (count == 0 || left < count * WPA_SELECTOR_LEN)
316 return _FAIL;
317 for (i = 0; i < count; i++) {
318 *pairwise_cipher |= r8712_get_wpa_cipher_suite(pos);
319 pos += WPA_SELECTOR_LEN;
320 left -= WPA_SELECTOR_LEN;
321 }
322 } else if (left == 1) {
323 return _FAIL;
324 }
325 return _SUCCESS;
326}
327
328int 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_) ||
340 (*(rsn_ie + 1) != (u8)(rsn_ie_len - 2)))
341 return _FAIL;
342 pos = rsn_ie;
343 pos += 4;
344 left = rsn_ie_len - 4;
345 /*group_cipher*/
346 if (left >= RSN_SELECTOR_LEN) {
347 *group_cipher = r8712_get_wpa2_cipher_suite(pos);
348 pos += RSN_SELECTOR_LEN;
349 left -= RSN_SELECTOR_LEN;
350 } else if (left > 0) {
351 return _FAIL;
352 }
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 }
368 return _SUCCESS;
369}
370
371int r8712_get_sec_ie(u8 *in_ie, uint in_len, u8 *rsn_ie, u16 *rsn_len,
372 u8 *wpa_ie, u16 *wpa_len)
373{
374 u8 authmode;
375 u8 wpa_oui[4] = {0x0, 0x50, 0xf2, 0x01};
376 uint cnt;
377
378 /*Search required WPA or WPA2 IE and copy to sec_ie[ ]*/
379 cnt = _TIMESTAMP_ + _BEACON_ITERVAL_ + _CAPABILITY_;
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 }
398 return *rsn_len + *wpa_len;
399}
400
401int r8712_get_wps_ie(u8 *in_ie, uint in_len, u8 *wps_ie, uint *wps_ielen)
402{
403 int match;
404 uint cnt;
405 u8 eid, wps_oui[4] = {0x0, 0x50, 0xf2, 0x04};
406
407 cnt = 12;
408 match = false;
409 while (cnt < in_len) {
410 eid = in_ie[cnt];
411 if ((eid == _WPA_IE_ID_) &&
412 (!memcmp(&in_ie[cnt + 2], wps_oui, 4))) {
413 memcpy(wps_ie, &in_ie[cnt], in_ie[cnt + 1] + 2);
414 *wps_ielen = in_ie[cnt + 1] + 2;
415 cnt += in_ie[cnt + 1] + 2;
416 match = true;
417 break;
418 }
419 cnt += in_ie[cnt + 1] + 2; /* goto next */
420 }
421 return match;
422}