tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/******************************************************************************
3 * ieee80211.c
4 *
5 * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
6 * Linux device driver for RTL8192SU
7 *
8 * Modifications for inclusion into the Linux staging tree are
9 * Copyright(c) 2010 Larry Finger. All rights reserved.
10 *
11 * Contact information:
12 * WLAN FAE <wlanfae@realtek.com>.
13 * Larry Finger <Larry.Finger@lwfinger.net>
14 *
15 ******************************************************************************/
16
17#define _IEEE80211_C
18
19#include "drv_types.h"
20#include "ieee80211.h"
21#include "wifi.h"
22#include "osdep_service.h"
23#include "wlan_bssdef.h"
24
25static const u8 WPA_OUI_TYPE[] = {0x00, 0x50, 0xf2, 1};
26static const u8 WPA_CIPHER_SUITE_NONE[] = {0x00, 0x50, 0xf2, 0};
27static const u8 WPA_CIPHER_SUITE_WEP40[] = {0x00, 0x50, 0xf2, 1};
28static const u8 WPA_CIPHER_SUITE_TKIP[] = {0x00, 0x50, 0xf2, 2};
29static const u8 WPA_CIPHER_SUITE_CCMP[] = {0x00, 0x50, 0xf2, 4};
30static const u8 WPA_CIPHER_SUITE_WEP104[] = {0x00, 0x50, 0xf2, 5};
31
32static const u8 RSN_CIPHER_SUITE_NONE[] = {0x00, 0x0f, 0xac, 0};
33static const u8 RSN_CIPHER_SUITE_WEP40[] = {0x00, 0x0f, 0xac, 1};
34static const u8 RSN_CIPHER_SUITE_TKIP[] = {0x00, 0x0f, 0xac, 2};
35static const u8 RSN_CIPHER_SUITE_CCMP[] = {0x00, 0x0f, 0xac, 4};
36static const u8 RSN_CIPHER_SUITE_WEP104[] = {0x00, 0x0f, 0xac, 5};
37
38/*-----------------------------------------------------------
39 * for adhoc-master to generate ie and provide supported-rate to fw
40 *-----------------------------------------------------------
41 */
42
43static u8 WIFI_CCKRATES[] = {
44 (IEEE80211_CCK_RATE_1MB | IEEE80211_BASIC_RATE_MASK),
45 (IEEE80211_CCK_RATE_2MB | IEEE80211_BASIC_RATE_MASK),
46 (IEEE80211_CCK_RATE_5MB | IEEE80211_BASIC_RATE_MASK),
47 (IEEE80211_CCK_RATE_11MB | IEEE80211_BASIC_RATE_MASK)
48};
49
50static u8 WIFI_OFDMRATES[] = {
51 (IEEE80211_OFDM_RATE_6MB),
52 (IEEE80211_OFDM_RATE_9MB),
53 (IEEE80211_OFDM_RATE_12MB),
54 (IEEE80211_OFDM_RATE_18MB),
55 (IEEE80211_OFDM_RATE_24MB),
56 (IEEE80211_OFDM_RATE_36MB),
57 (IEEE80211_OFDM_RATE_48MB),
58 (IEEE80211_OFDM_RATE_54MB)
59};
60
61uint r8712_is_cckrates_included(u8 *rate)
62{
63 u32 i = 0;
64
65 while (rate[i] != 0) {
66 if ((((rate[i]) & 0x7f) == 2) || (((rate[i]) & 0x7f) == 4) ||
67 (((rate[i]) & 0x7f) == 11) || (((rate[i]) & 0x7f) == 22))
68 return true;
69 i++;
70 }
71 return false;
72}
73
74uint r8712_is_cckratesonly_included(u8 *rate)
75{
76 u32 i = 0;
77
78 while (rate[i] != 0) {
79 if ((((rate[i]) & 0x7f) != 2) && (((rate[i]) & 0x7f) != 4) &&
80 (((rate[i]) & 0x7f) != 11) && (((rate[i]) & 0x7f) != 22))
81 return false;
82 i++;
83 }
84 return true;
85}
86
87/* r8712_set_ie will update frame length */
88u8 *r8712_set_ie(u8 *pbuf, sint index, uint len, u8 *source, uint *frlen)
89{
90 *pbuf = (u8)index;
91 *(pbuf + 1) = (u8)len;
92 if (len > 0)
93 memcpy((void *)(pbuf + 2), (void *)source, len);
94 *frlen = *frlen + (len + 2);
95 return pbuf + len + 2;
96}
97
98/* ---------------------------------------------------------------------------
99 * index: the information element id index, limit is the limit for search
100 * ---------------------------------------------------------------------------
101 */
102u8 *r8712_get_ie(u8 *pbuf, sint index, uint *len, sint limit)
103{
104 sint tmp, i;
105 u8 *p;
106
107 if (limit < 1)
108 return NULL;
109 p = pbuf;
110 i = 0;
111 *len = 0;
112 while (1) {
113 if (*p == index) {
114 *len = *(p + 1);
115 return p;
116 }
117 tmp = *(p + 1);
118 p += (tmp + 2);
119 i += (tmp + 2);
120 if (i >= limit)
121 break;
122 }
123 return NULL;
124}
125
126static void set_supported_rate(u8 *rates, uint mode)
127{
128 memset(rates, 0, NDIS_802_11_LENGTH_RATES_EX);
129 switch (mode) {
130 case WIRELESS_11B:
131 memcpy(rates, WIFI_CCKRATES, IEEE80211_CCK_RATE_LEN);
132 break;
133 case WIRELESS_11G:
134 case WIRELESS_11A:
135 memcpy(rates, WIFI_OFDMRATES, IEEE80211_NUM_OFDM_RATESLEN);
136 break;
137 case WIRELESS_11BG:
138 memcpy(rates, WIFI_CCKRATES, IEEE80211_CCK_RATE_LEN);
139 memcpy(rates + IEEE80211_CCK_RATE_LEN, WIFI_OFDMRATES,
140 IEEE80211_NUM_OFDM_RATESLEN);
141 break;
142 }
143}
144
145static uint r8712_get_rateset_len(u8 *rateset)
146{
147 uint i = 0;
148
149 while (1) {
150 if ((rateset[i]) == 0)
151 break;
152 if (i > 12)
153 break;
154 i++;
155 }
156 return i;
157}
158
159int r8712_generate_ie(struct registry_priv *pregistrypriv)
160{
161 int rate_len;
162 uint sz = 0;
163 struct wlan_bssid_ex *pdev_network = &pregistrypriv->dev_network;
164 u8 *ie = pdev_network->IEs;
165 u16 beaconPeriod = (u16)pdev_network->Configuration.BeaconPeriod;
166
167 /*timestamp will be inserted by hardware*/
168 sz += 8;
169 ie += sz;
170 /*beacon interval : 2bytes*/
171 *(__le16 *)ie = cpu_to_le16(beaconPeriod);
172 sz += 2;
173 ie += 2;
174 /*capability info*/
175 *(u16 *)ie = 0;
176 *(__le16 *)ie |= cpu_to_le16(cap_IBSS);
177 if (pregistrypriv->preamble == PREAMBLE_SHORT)
178 *(__le16 *)ie |= cpu_to_le16(cap_ShortPremble);
179 if (pdev_network->Privacy)
180 *(__le16 *)ie |= cpu_to_le16(cap_Privacy);
181 sz += 2;
182 ie += 2;
183 /*SSID*/
184 ie = r8712_set_ie(ie, _SSID_IE_, pdev_network->Ssid.SsidLength,
185 pdev_network->Ssid.Ssid, &sz);
186 /*supported rates*/
187 set_supported_rate(pdev_network->rates, pregistrypriv->wireless_mode);
188 rate_len = r8712_get_rateset_len(pdev_network->rates);
189 if (rate_len > 8) {
190 ie = r8712_set_ie(ie, _SUPPORTEDRATES_IE_, 8,
191 pdev_network->rates, &sz);
192 ie = r8712_set_ie(ie, _EXT_SUPPORTEDRATES_IE_, (rate_len - 8),
193 (pdev_network->rates + 8), &sz);
194 } else {
195 ie = r8712_set_ie(ie, _SUPPORTEDRATES_IE_,
196 rate_len, pdev_network->rates, &sz);
197 }
198 /*DS parameter set*/
199 ie = r8712_set_ie(ie, _DSSET_IE_, 1,
200 (u8 *)&pdev_network->Configuration.DSConfig, &sz);
201 /*IBSS Parameter Set*/
202 ie = r8712_set_ie(ie, _IBSS_PARA_IE_, 2,
203 (u8 *)&pdev_network->Configuration.ATIMWindow, &sz);
204 return sz;
205}
206
207unsigned char *r8712_get_wpa_ie(unsigned char *pie, uint *wpa_ie_len, int limit)
208{
209 u32 len;
210 u16 val16;
211 unsigned char wpa_oui_type[] = {0x00, 0x50, 0xf2, 0x01};
212 u8 *pbuf = pie;
213
214 while (1) {
215 pbuf = r8712_get_ie(pbuf, _WPA_IE_ID_, &len, limit);
216 if (pbuf) {
217 /*check if oui matches...*/
218 if (memcmp((pbuf + 2), wpa_oui_type,
219 sizeof(wpa_oui_type)))
220 goto check_next_ie;
221 /*check version...*/
222 memcpy((u8 *)&val16, (pbuf + 6), sizeof(val16));
223 le16_to_cpus(&val16);
224 if (val16 != 0x0001)
225 goto check_next_ie;
226 *wpa_ie_len = *(pbuf + 1);
227 return pbuf;
228 }
229 *wpa_ie_len = 0;
230 return NULL;
231check_next_ie:
232 limit = limit - (pbuf - pie) - 2 - len;
233 if (limit <= 0)
234 break;
235 pbuf += (2 + len);
236 }
237 *wpa_ie_len = 0;
238 return NULL;
239}
240
241unsigned char *r8712_get_wpa2_ie(unsigned char *pie, uint *rsn_ie_len, int limit)
242{
243 return r8712_get_ie(pie, _WPA2_IE_ID_, rsn_ie_len, limit);
244}
245
246static int r8712_get_wpa_cipher_suite(u8 *s)
247{
248 if (!memcmp(s, (void *)WPA_CIPHER_SUITE_NONE, WPA_SELECTOR_LEN))
249 return WPA_CIPHER_NONE;
250 if (!memcmp(s, (void *)WPA_CIPHER_SUITE_WEP40, WPA_SELECTOR_LEN))
251 return WPA_CIPHER_WEP40;
252 if (!memcmp(s, (void *)WPA_CIPHER_SUITE_TKIP, WPA_SELECTOR_LEN))
253 return WPA_CIPHER_TKIP;
254 if (!memcmp(s, (void *)WPA_CIPHER_SUITE_CCMP, WPA_SELECTOR_LEN))
255 return WPA_CIPHER_CCMP;
256 if (!memcmp(s, (void *)WPA_CIPHER_SUITE_WEP104, WPA_SELECTOR_LEN))
257 return WPA_CIPHER_WEP104;
258 return 0;
259}
260
261static int r8712_get_wpa2_cipher_suite(u8 *s)
262{
263 if (!memcmp(s, (void *)RSN_CIPHER_SUITE_NONE, RSN_SELECTOR_LEN))
264 return WPA_CIPHER_NONE;
265 if (!memcmp(s, (void *)RSN_CIPHER_SUITE_WEP40, RSN_SELECTOR_LEN))
266 return WPA_CIPHER_WEP40;
267 if (!memcmp(s, (void *)RSN_CIPHER_SUITE_TKIP, RSN_SELECTOR_LEN))
268 return WPA_CIPHER_TKIP;
269 if (!memcmp(s, (void *)RSN_CIPHER_SUITE_CCMP, RSN_SELECTOR_LEN))
270 return WPA_CIPHER_CCMP;
271 if (!memcmp(s, (void *)RSN_CIPHER_SUITE_WEP104, RSN_SELECTOR_LEN))
272 return WPA_CIPHER_WEP104;
273 return 0;
274}
275
276int r8712_parse_wpa_ie(u8 *wpa_ie, int wpa_ie_len, int *group_cipher,
277 int *pairwise_cipher)
278{
279 int i;
280 int left, count;
281 u8 *pos;
282
283 if (wpa_ie_len <= 0) {
284 /* No WPA IE - fail silently */
285 return _FAIL;
286 }
287 if ((*wpa_ie != _WPA_IE_ID_) ||
288 (*(wpa_ie + 1) != (u8)(wpa_ie_len - 2)) ||
289 (memcmp(wpa_ie + 2, (void *)WPA_OUI_TYPE, WPA_SELECTOR_LEN)))
290 return _FAIL;
291 pos = wpa_ie;
292 pos += 8;
293 left = wpa_ie_len - 8;
294 /*group_cipher*/
295 if (left >= WPA_SELECTOR_LEN) {
296 *group_cipher = r8712_get_wpa_cipher_suite(pos);
297 pos += WPA_SELECTOR_LEN;
298 left -= WPA_SELECTOR_LEN;
299 } else if (left > 0) {
300 return _FAIL;
301 }
302 /*pairwise_cipher*/
303 if (left >= 2) {
304 count = le16_to_cpu(*(__le16 *)pos);
305 pos += 2;
306 left -= 2;
307 if (count == 0 || left < count * WPA_SELECTOR_LEN)
308 return _FAIL;
309 for (i = 0; i < count; i++) {
310 *pairwise_cipher |= r8712_get_wpa_cipher_suite(pos);
311 pos += WPA_SELECTOR_LEN;
312 left -= WPA_SELECTOR_LEN;
313 }
314 } else if (left == 1) {
315 return _FAIL;
316 }
317 return _SUCCESS;
318}
319
320int r8712_parse_wpa2_ie(u8 *rsn_ie, int rsn_ie_len, int *group_cipher,
321 int *pairwise_cipher)
322{
323 int i;
324 int left, count;
325 u8 *pos;
326
327 if (rsn_ie_len <= 0) {
328 /* No RSN IE - fail silently */
329 return _FAIL;
330 }
331 if ((*rsn_ie != _WPA2_IE_ID_) ||
332 (*(rsn_ie + 1) != (u8)(rsn_ie_len - 2)))
333 return _FAIL;
334 pos = rsn_ie;
335 pos += 4;
336 left = rsn_ie_len - 4;
337 /*group_cipher*/
338 if (left >= RSN_SELECTOR_LEN) {
339 *group_cipher = r8712_get_wpa2_cipher_suite(pos);
340 pos += RSN_SELECTOR_LEN;
341 left -= RSN_SELECTOR_LEN;
342 } else if (left > 0) {
343 return _FAIL;
344 }
345 /*pairwise_cipher*/
346 if (left >= 2) {
347 count = le16_to_cpu(*(__le16 *)pos);
348 pos += 2;
349 left -= 2;
350 if (count == 0 || left < count * RSN_SELECTOR_LEN)
351 return _FAIL;
352 for (i = 0; i < count; i++) {
353 *pairwise_cipher |= r8712_get_wpa2_cipher_suite(pos);
354 pos += RSN_SELECTOR_LEN;
355 left -= RSN_SELECTOR_LEN;
356 }
357 } else if (left == 1) {
358 return _FAIL;
359 }
360 return _SUCCESS;
361}
362
363int r8712_get_sec_ie(u8 *in_ie, uint in_len, u8 *rsn_ie, u16 *rsn_len,
364 u8 *wpa_ie, u16 *wpa_len)
365{
366 u8 authmode;
367 u8 wpa_oui[4] = {0x0, 0x50, 0xf2, 0x01};
368 uint cnt;
369
370 /*Search required WPA or WPA2 IE and copy to sec_ie[ ]*/
371 cnt = _TIMESTAMP_ + _BEACON_ITERVAL_ + _CAPABILITY_;
372 while (cnt < in_len) {
373 authmode = in_ie[cnt];
374 if ((authmode == _WPA_IE_ID_) &&
375 (!memcmp(&in_ie[cnt + 2], &wpa_oui[0], 4))) {
376 memcpy(wpa_ie, &in_ie[cnt], in_ie[cnt + 1] + 2);
377 *wpa_len = in_ie[cnt + 1] + 2;
378 cnt += in_ie[cnt + 1] + 2; /*get next */
379 } else {
380 if (authmode == _WPA2_IE_ID_) {
381 memcpy(rsn_ie, &in_ie[cnt],
382 in_ie[cnt + 1] + 2);
383 *rsn_len = in_ie[cnt + 1] + 2;
384 cnt += in_ie[cnt + 1] + 2; /*get next*/
385 } else {
386 cnt += in_ie[cnt + 1] + 2; /*get next*/
387 }
388 }
389 }
390 return *rsn_len + *wpa_len;
391}
392
393int r8712_get_wps_ie(u8 *in_ie, uint in_len, u8 *wps_ie, uint *wps_ielen)
394{
395 int match;
396 uint cnt;
397 u8 eid, wps_oui[4] = {0x0, 0x50, 0xf2, 0x04};
398
399 cnt = 12;
400 match = false;
401 while (cnt < in_len) {
402 eid = in_ie[cnt];
403 if ((eid == _WPA_IE_ID_) &&
404 (!memcmp(&in_ie[cnt + 2], wps_oui, 4))) {
405 memcpy(wps_ie, &in_ie[cnt], in_ie[cnt + 1] + 2);
406 *wps_ielen = in_ie[cnt + 1] + 2;
407 cnt += in_ie[cnt + 1] + 2;
408 match = true;
409 break;
410 }
411 cnt += in_ie[cnt + 1] + 2; /* goto next */
412 }
413 return match;
414}