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ath5k: Update reset code
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / mlme.c
blob91c9a5a5746dc7e1ddc7f2f7a54bb089d87faf3f
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/wireless.h>
19 #include <linux/random.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/iw_handler.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
32 #define IEEE80211_AUTH_MAX_TRIES 3
33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
34 #define IEEE80211_ASSOC_MAX_TRIES 3
35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
36 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
38 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
41
42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
44
45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
46
47
48 /* utils */
49 static int ecw2cw(int ecw)
50 {
51 return (1 << ecw) - 1;
52 }
53
54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
55 {
56 u8 *end, *pos;
57
58 pos = bss->ies;
59 if (pos == NULL)
60 return NULL;
61 end = pos + bss->ies_len;
62
63 while (pos + 1 < end) {
64 if (pos + 2 + pos[1] > end)
65 break;
66 if (pos[0] == ie)
67 return pos;
68 pos += 2 + pos[1];
69 }
70
71 return NULL;
72 }
73
74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
75 struct ieee80211_supported_band *sband,
76 u32 *rates)
77 {
78 int i, j, count;
79 *rates = 0;
80 count = 0;
81 for (i = 0; i < bss->supp_rates_len; i++) {
82 int rate = (bss->supp_rates[i] & 0x7F) * 5;
83
84 for (j = 0; j < sband->n_bitrates; j++)
85 if (sband->bitrates[j].bitrate == rate) {
86 *rates |= BIT(j);
87 count++;
88 break;
89 }
90 }
91
92 return count;
93 }
94
95 /* also used by mesh code */
96 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
97 struct ieee802_11_elems *elems,
98 enum ieee80211_band band)
99 {
100 struct ieee80211_supported_band *sband;
101 struct ieee80211_rate *bitrates;
102 size_t num_rates;
103 u32 supp_rates;
104 int i, j;
105 sband = local->hw.wiphy->bands[band];
106
107 if (!sband) {
108 WARN_ON(1);
109 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
110 }
111
112 bitrates = sband->bitrates;
113 num_rates = sband->n_bitrates;
114 supp_rates = 0;
115 for (i = 0; i < elems->supp_rates_len +
116 elems->ext_supp_rates_len; i++) {
117 u8 rate = 0;
118 int own_rate;
119 if (i < elems->supp_rates_len)
120 rate = elems->supp_rates[i];
121 else if (elems->ext_supp_rates)
122 rate = elems->ext_supp_rates
123 [i - elems->supp_rates_len];
124 own_rate = 5 * (rate & 0x7f);
125 for (j = 0; j < num_rates; j++)
126 if (bitrates[j].bitrate == own_rate)
127 supp_rates |= BIT(j);
128 }
129 return supp_rates;
130 }
131
132 /* frame sending functions */
133
134 static void add_extra_ies(struct sk_buff *skb, u8 *ies, size_t ies_len)
135 {
136 if (ies)
137 memcpy(skb_put(skb, ies_len), ies, ies_len);
138 }
139
140 /* also used by scanning code */
141 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
142 u8 *ssid, size_t ssid_len)
143 {
144 struct ieee80211_local *local = sdata->local;
145 struct ieee80211_supported_band *sband;
146 struct sk_buff *skb;
147 struct ieee80211_mgmt *mgmt;
148 u8 *pos, *supp_rates, *esupp_rates = NULL;
149 int i;
150
151 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
152 sdata->u.sta.ie_probereq_len);
153 if (!skb) {
154 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
155 "request\n", sdata->dev->name);
156 return;
157 }
158 skb_reserve(skb, local->hw.extra_tx_headroom);
159
160 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
161 memset(mgmt, 0, 24);
162 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
163 IEEE80211_STYPE_PROBE_REQ);
164 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
165 if (dst) {
166 memcpy(mgmt->da, dst, ETH_ALEN);
167 memcpy(mgmt->bssid, dst, ETH_ALEN);
168 } else {
169 memset(mgmt->da, 0xff, ETH_ALEN);
170 memset(mgmt->bssid, 0xff, ETH_ALEN);
171 }
172 pos = skb_put(skb, 2 + ssid_len);
173 *pos++ = WLAN_EID_SSID;
174 *pos++ = ssid_len;
175 memcpy(pos, ssid, ssid_len);
176
177 supp_rates = skb_put(skb, 2);
178 supp_rates[0] = WLAN_EID_SUPP_RATES;
179 supp_rates[1] = 0;
180 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
181
182 for (i = 0; i < sband->n_bitrates; i++) {
183 struct ieee80211_rate *rate = &sband->bitrates[i];
184 if (esupp_rates) {
185 pos = skb_put(skb, 1);
186 esupp_rates[1]++;
187 } else if (supp_rates[1] == 8) {
188 esupp_rates = skb_put(skb, 3);
189 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
190 esupp_rates[1] = 1;
191 pos = &esupp_rates[2];
192 } else {
193 pos = skb_put(skb, 1);
194 supp_rates[1]++;
195 }
196 *pos = rate->bitrate / 5;
197 }
198
199 add_extra_ies(skb, sdata->u.sta.ie_probereq,
200 sdata->u.sta.ie_probereq_len);
201
202 ieee80211_tx_skb(sdata, skb, 0);
203 }
204
205 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
206 struct ieee80211_if_sta *ifsta,
207 int transaction, u8 *extra, size_t extra_len,
208 int encrypt)
209 {
210 struct ieee80211_local *local = sdata->local;
211 struct sk_buff *skb;
212 struct ieee80211_mgmt *mgmt;
213
214 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
215 sizeof(*mgmt) + 6 + extra_len +
216 sdata->u.sta.ie_auth_len);
217 if (!skb) {
218 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
219 "frame\n", sdata->dev->name);
220 return;
221 }
222 skb_reserve(skb, local->hw.extra_tx_headroom);
223
224 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
225 memset(mgmt, 0, 24 + 6);
226 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
227 IEEE80211_STYPE_AUTH);
228 if (encrypt)
229 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
230 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
231 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
232 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
233 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
234 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
235 ifsta->auth_transaction = transaction + 1;
236 mgmt->u.auth.status_code = cpu_to_le16(0);
237 if (extra)
238 memcpy(skb_put(skb, extra_len), extra, extra_len);
239 add_extra_ies(skb, sdata->u.sta.ie_auth, sdata->u.sta.ie_auth_len);
240
241 ieee80211_tx_skb(sdata, skb, encrypt);
242 }
243
244 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
245 struct ieee80211_if_sta *ifsta)
246 {
247 struct ieee80211_local *local = sdata->local;
248 struct sk_buff *skb;
249 struct ieee80211_mgmt *mgmt;
250 u8 *pos, *ies, *ht_ie, *e_ies;
251 int i, len, count, rates_len, supp_rates_len;
252 u16 capab;
253 struct ieee80211_bss *bss;
254 int wmm = 0;
255 struct ieee80211_supported_band *sband;
256 u32 rates = 0;
257 size_t e_ies_len;
258
259 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
260 e_ies = sdata->u.sta.ie_reassocreq;
261 e_ies_len = sdata->u.sta.ie_reassocreq_len;
262 } else {
263 e_ies = sdata->u.sta.ie_assocreq;
264 e_ies_len = sdata->u.sta.ie_assocreq_len;
265 }
266
267 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
268 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
269 ifsta->ssid_len + e_ies_len);
270 if (!skb) {
271 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
272 "frame\n", sdata->dev->name);
273 return;
274 }
275 skb_reserve(skb, local->hw.extra_tx_headroom);
276
277 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
278
279 capab = ifsta->capab;
280
281 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
282 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
283 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
284 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
285 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
286 }
287
288 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
289 local->hw.conf.channel->center_freq,
290 ifsta->ssid, ifsta->ssid_len);
291 if (bss) {
292 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
293 capab |= WLAN_CAPABILITY_PRIVACY;
294 if (bss->wmm_used)
295 wmm = 1;
296
297 /* get all rates supported by the device and the AP as
298 * some APs don't like getting a superset of their rates
299 * in the association request (e.g. D-Link DAP 1353 in
300 * b-only mode) */
301 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
302
303 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
304 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
305 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
306
307 ieee80211_rx_bss_put(local, bss);
308 } else {
309 rates = ~0;
310 rates_len = sband->n_bitrates;
311 }
312
313 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
314 memset(mgmt, 0, 24);
315 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
316 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
317 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
318
319 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
320 skb_put(skb, 10);
321 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
322 IEEE80211_STYPE_REASSOC_REQ);
323 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
324 mgmt->u.reassoc_req.listen_interval =
325 cpu_to_le16(local->hw.conf.listen_interval);
326 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
327 ETH_ALEN);
328 } else {
329 skb_put(skb, 4);
330 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
331 IEEE80211_STYPE_ASSOC_REQ);
332 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
333 mgmt->u.assoc_req.listen_interval =
334 cpu_to_le16(local->hw.conf.listen_interval);
335 }
336
337 /* SSID */
338 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
339 *pos++ = WLAN_EID_SSID;
340 *pos++ = ifsta->ssid_len;
341 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
342
343 /* add all rates which were marked to be used above */
344 supp_rates_len = rates_len;
345 if (supp_rates_len > 8)
346 supp_rates_len = 8;
347
348 len = sband->n_bitrates;
349 pos = skb_put(skb, supp_rates_len + 2);
350 *pos++ = WLAN_EID_SUPP_RATES;
351 *pos++ = supp_rates_len;
352
353 count = 0;
354 for (i = 0; i < sband->n_bitrates; i++) {
355 if (BIT(i) & rates) {
356 int rate = sband->bitrates[i].bitrate;
357 *pos++ = (u8) (rate / 5);
358 if (++count == 8)
359 break;
360 }
361 }
362
363 if (rates_len > count) {
364 pos = skb_put(skb, rates_len - count + 2);
365 *pos++ = WLAN_EID_EXT_SUPP_RATES;
366 *pos++ = rates_len - count;
367
368 for (i++; i < sband->n_bitrates; i++) {
369 if (BIT(i) & rates) {
370 int rate = sband->bitrates[i].bitrate;
371 *pos++ = (u8) (rate / 5);
372 }
373 }
374 }
375
376 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
377 /* 1. power capabilities */
378 pos = skb_put(skb, 4);
379 *pos++ = WLAN_EID_PWR_CAPABILITY;
380 *pos++ = 2;
381 *pos++ = 0; /* min tx power */
382 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
383
384 /* 2. supported channels */
385 /* TODO: get this in reg domain format */
386 pos = skb_put(skb, 2 * sband->n_channels + 2);
387 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
388 *pos++ = 2 * sband->n_channels;
389 for (i = 0; i < sband->n_channels; i++) {
390 *pos++ = ieee80211_frequency_to_channel(
391 sband->channels[i].center_freq);
392 *pos++ = 1; /* one channel in the subband*/
393 }
394 }
395
396 if (ifsta->extra_ie) {
397 pos = skb_put(skb, ifsta->extra_ie_len);
398 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
399 }
400
401 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
402 pos = skb_put(skb, 9);
403 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
404 *pos++ = 7; /* len */
405 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
406 *pos++ = 0x50;
407 *pos++ = 0xf2;
408 *pos++ = 2; /* WME */
409 *pos++ = 0; /* WME info */
410 *pos++ = 1; /* WME ver */
411 *pos++ = 0;
412 }
413
414 /* wmm support is a must to HT */
415 /*
416 * IEEE802.11n does not allow TKIP/WEP as pairwise
417 * ciphers in HT mode. We still associate in non-ht
418 * mode (11a/b/g) if any one of these ciphers is
419 * configured as pairwise.
420 */
421 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
422 sband->ht_cap.ht_supported &&
423 (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
424 ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
425 (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
426 struct ieee80211_ht_info *ht_info =
427 (struct ieee80211_ht_info *)(ht_ie + 2);
428 u16 cap = sband->ht_cap.cap;
429 __le16 tmp;
430 u32 flags = local->hw.conf.channel->flags;
431
432 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
433 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
434 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
435 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
436 cap &= ~IEEE80211_HT_CAP_SGI_40;
437 }
438 break;
439 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
440 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
441 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
442 cap &= ~IEEE80211_HT_CAP_SGI_40;
443 }
444 break;
445 }
446
447 tmp = cpu_to_le16(cap);
448 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
449 *pos++ = WLAN_EID_HT_CAPABILITY;
450 *pos++ = sizeof(struct ieee80211_ht_cap);
451 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
452 memcpy(pos, &tmp, sizeof(u16));
453 pos += sizeof(u16);
454 /* TODO: needs a define here for << 2 */
455 *pos++ = sband->ht_cap.ampdu_factor |
456 (sband->ht_cap.ampdu_density << 2);
457 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
458 }
459
460 add_extra_ies(skb, e_ies, e_ies_len);
461
462 kfree(ifsta->assocreq_ies);
463 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
464 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
465 if (ifsta->assocreq_ies)
466 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
467
468 ieee80211_tx_skb(sdata, skb, 0);
469 }
470
471
472 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
473 u16 stype, u16 reason)
474 {
475 struct ieee80211_local *local = sdata->local;
476 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
477 struct sk_buff *skb;
478 struct ieee80211_mgmt *mgmt;
479 u8 *ies;
480 size_t ies_len;
481
482 if (stype == IEEE80211_STYPE_DEAUTH) {
483 ies = sdata->u.sta.ie_deauth;
484 ies_len = sdata->u.sta.ie_deauth_len;
485 } else {
486 ies = sdata->u.sta.ie_disassoc;
487 ies_len = sdata->u.sta.ie_disassoc_len;
488 }
489
490 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) +
491 ies_len);
492 if (!skb) {
493 printk(KERN_DEBUG "%s: failed to allocate buffer for "
494 "deauth/disassoc frame\n", sdata->dev->name);
495 return;
496 }
497 skb_reserve(skb, local->hw.extra_tx_headroom);
498
499 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
500 memset(mgmt, 0, 24);
501 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
502 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
503 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
504 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
505 skb_put(skb, 2);
506 /* u.deauth.reason_code == u.disassoc.reason_code */
507 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
508
509 add_extra_ies(skb, ies, ies_len);
510
511 ieee80211_tx_skb(sdata, skb, ifsta->flags & IEEE80211_STA_MFP_ENABLED);
512 }
513
514 /* MLME */
515 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
516 struct ieee80211_bss *bss)
517 {
518 struct ieee80211_local *local = sdata->local;
519 int i, have_higher_than_11mbit = 0;
520
521 /* cf. IEEE 802.11 9.2.12 */
522 for (i = 0; i < bss->supp_rates_len; i++)
523 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
524 have_higher_than_11mbit = 1;
525
526 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
527 have_higher_than_11mbit)
528 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
529 else
530 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
531
532 ieee80211_set_wmm_default(sdata);
533 }
534
535 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
536 struct ieee80211_if_sta *ifsta,
537 u8 *wmm_param, size_t wmm_param_len)
538 {
539 struct ieee80211_tx_queue_params params;
540 size_t left;
541 int count;
542 u8 *pos;
543
544 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
545 return;
546
547 if (!wmm_param)
548 return;
549
550 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
551 return;
552 count = wmm_param[6] & 0x0f;
553 if (count == ifsta->wmm_last_param_set)
554 return;
555 ifsta->wmm_last_param_set = count;
556
557 pos = wmm_param + 8;
558 left = wmm_param_len - 8;
559
560 memset(&params, 0, sizeof(params));
561
562 if (!local->ops->conf_tx)
563 return;
564
565 local->wmm_acm = 0;
566 for (; left >= 4; left -= 4, pos += 4) {
567 int aci = (pos[0] >> 5) & 0x03;
568 int acm = (pos[0] >> 4) & 0x01;
569 int queue;
570
571 switch (aci) {
572 case 1:
573 queue = 3;
574 if (acm)
575 local->wmm_acm |= BIT(0) | BIT(3);
576 break;
577 case 2:
578 queue = 1;
579 if (acm)
580 local->wmm_acm |= BIT(4) | BIT(5);
581 break;
582 case 3:
583 queue = 0;
584 if (acm)
585 local->wmm_acm |= BIT(6) | BIT(7);
586 break;
587 case 0:
588 default:
589 queue = 2;
590 if (acm)
591 local->wmm_acm |= BIT(1) | BIT(2);
592 break;
593 }
594
595 params.aifs = pos[0] & 0x0f;
596 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
597 params.cw_min = ecw2cw(pos[1] & 0x0f);
598 params.txop = get_unaligned_le16(pos + 2);
599 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
600 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
601 "cWmin=%d cWmax=%d txop=%d\n",
602 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
603 params.cw_max, params.txop);
604 #endif
605 /* TODO: handle ACM (block TX, fallback to next lowest allowed
606 * AC for now) */
607 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
608 printk(KERN_DEBUG "%s: failed to set TX queue "
609 "parameters for queue %d\n", local->mdev->name, queue);
610 }
611 }
612 }
613
614 static bool check_tim(struct ieee802_11_elems *elems, u16 aid, bool *is_mc)
615 {
616 u8 mask;
617 u8 index, indexn1, indexn2;
618 struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
619
620 aid &= 0x3fff;
621 index = aid / 8;
622 mask = 1 << (aid & 7);
623
624 if (tim->bitmap_ctrl & 0x01)
625 *is_mc = true;
626
627 indexn1 = tim->bitmap_ctrl & 0xfe;
628 indexn2 = elems->tim_len + indexn1 - 4;
629
630 if (index < indexn1 || index > indexn2)
631 return false;
632
633 index -= indexn1;
634
635 return !!(tim->virtual_map[index] & mask);
636 }
637
638 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
639 u16 capab, bool erp_valid, u8 erp)
640 {
641 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
642 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
643 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
644 #endif
645 u32 changed = 0;
646 bool use_protection;
647 bool use_short_preamble;
648 bool use_short_slot;
649
650 if (erp_valid) {
651 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
652 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
653 } else {
654 use_protection = false;
655 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
656 }
657
658 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
659
660 if (use_protection != bss_conf->use_cts_prot) {
661 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
662 if (net_ratelimit()) {
663 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
664 sdata->dev->name,
665 use_protection ? "enabled" : "disabled",
666 ifsta->bssid);
667 }
668 #endif
669 bss_conf->use_cts_prot = use_protection;
670 changed |= BSS_CHANGED_ERP_CTS_PROT;
671 }
672
673 if (use_short_preamble != bss_conf->use_short_preamble) {
674 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
675 if (net_ratelimit()) {
676 printk(KERN_DEBUG "%s: switched to %s barker preamble"
677 " (BSSID=%pM)\n",
678 sdata->dev->name,
679 use_short_preamble ? "short" : "long",
680 ifsta->bssid);
681 }
682 #endif
683 bss_conf->use_short_preamble = use_short_preamble;
684 changed |= BSS_CHANGED_ERP_PREAMBLE;
685 }
686
687 if (use_short_slot != bss_conf->use_short_slot) {
688 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
689 if (net_ratelimit()) {
690 printk(KERN_DEBUG "%s: switched to %s slot time"
691 " (BSSID=%pM)\n",
692 sdata->dev->name,
693 use_short_slot ? "short" : "long",
694 ifsta->bssid);
695 }
696 #endif
697 bss_conf->use_short_slot = use_short_slot;
698 changed |= BSS_CHANGED_ERP_SLOT;
699 }
700
701 return changed;
702 }
703
704 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
705 struct ieee80211_if_sta *ifsta)
706 {
707 union iwreq_data wrqu;
708 memset(&wrqu, 0, sizeof(wrqu));
709 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
710 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
711 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
712 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
713 }
714
715 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
716 struct ieee80211_if_sta *ifsta)
717 {
718 char *buf;
719 size_t len;
720 int i;
721 union iwreq_data wrqu;
722
723 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
724 return;
725
726 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
727 ifsta->assocresp_ies_len), GFP_KERNEL);
728 if (!buf)
729 return;
730
731 len = sprintf(buf, "ASSOCINFO(");
732 if (ifsta->assocreq_ies) {
733 len += sprintf(buf + len, "ReqIEs=");
734 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
735 len += sprintf(buf + len, "%02x",
736 ifsta->assocreq_ies[i]);
737 }
738 }
739 if (ifsta->assocresp_ies) {
740 if (ifsta->assocreq_ies)
741 len += sprintf(buf + len, " ");
742 len += sprintf(buf + len, "RespIEs=");
743 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
744 len += sprintf(buf + len, "%02x",
745 ifsta->assocresp_ies[i]);
746 }
747 }
748 len += sprintf(buf + len, ")");
749
750 if (len > IW_CUSTOM_MAX) {
751 len = sprintf(buf, "ASSOCRESPIE=");
752 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
753 len += sprintf(buf + len, "%02x",
754 ifsta->assocresp_ies[i]);
755 }
756 }
757
758 if (len <= IW_CUSTOM_MAX) {
759 memset(&wrqu, 0, sizeof(wrqu));
760 wrqu.data.length = len;
761 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
762 }
763
764 kfree(buf);
765 }
766
767
768 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
769 struct ieee80211_if_sta *ifsta,
770 u32 bss_info_changed)
771 {
772 struct ieee80211_local *local = sdata->local;
773 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
774
775 struct ieee80211_bss *bss;
776
777 bss_info_changed |= BSS_CHANGED_ASSOC;
778 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
779
780 if (sdata->vif.type != NL80211_IFTYPE_STATION)
781 return;
782
783 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
784 conf->channel->center_freq,
785 ifsta->ssid, ifsta->ssid_len);
786 if (bss) {
787 /* set timing information */
788 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
789 sdata->vif.bss_conf.timestamp = bss->timestamp;
790 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
791
792 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
793 bss->capability, bss->has_erp_value, bss->erp_value);
794
795 ieee80211_rx_bss_put(local, bss);
796 }
797
798 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
799 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
800 ieee80211_sta_send_associnfo(sdata, ifsta);
801
802 ifsta->last_probe = jiffies;
803 ieee80211_led_assoc(local, 1);
804
805 sdata->vif.bss_conf.assoc = 1;
806 /*
807 * For now just always ask the driver to update the basic rateset
808 * when we have associated, we aren't checking whether it actually
809 * changed or not.
810 */
811 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
812 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
813
814 if (local->powersave) {
815 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
816 local->hw.conf.dynamic_ps_timeout > 0) {
817 mod_timer(&local->dynamic_ps_timer, jiffies +
818 msecs_to_jiffies(
819 local->hw.conf.dynamic_ps_timeout));
820 } else {
821 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
822 ieee80211_send_nullfunc(local, sdata, 1);
823 conf->flags |= IEEE80211_CONF_PS;
824 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
825 }
826 }
827
828 netif_tx_start_all_queues(sdata->dev);
829 netif_carrier_on(sdata->dev);
830
831 ieee80211_sta_send_apinfo(sdata, ifsta);
832 }
833
834 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
835 struct ieee80211_if_sta *ifsta)
836 {
837 ifsta->direct_probe_tries++;
838 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
839 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
840 sdata->dev->name, ifsta->bssid);
841 ifsta->state = IEEE80211_STA_MLME_DISABLED;
842 ieee80211_sta_send_apinfo(sdata, ifsta);
843
844 /*
845 * Most likely AP is not in the range so remove the
846 * bss information associated to the AP
847 */
848 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
849 sdata->local->hw.conf.channel->center_freq,
850 ifsta->ssid, ifsta->ssid_len);
851 return;
852 }
853
854 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
855 sdata->dev->name, ifsta->bssid,
856 ifsta->direct_probe_tries);
857
858 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
859
860 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
861
862 /* Direct probe is sent to broadcast address as some APs
863 * will not answer to direct packet in unassociated state.
864 */
865 ieee80211_send_probe_req(sdata, NULL,
866 ifsta->ssid, ifsta->ssid_len);
867
868 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
869 }
870
871
872 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
873 struct ieee80211_if_sta *ifsta)
874 {
875 ifsta->auth_tries++;
876 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
877 printk(KERN_DEBUG "%s: authentication with AP %pM"
878 " timed out\n",
879 sdata->dev->name, ifsta->bssid);
880 ifsta->state = IEEE80211_STA_MLME_DISABLED;
881 ieee80211_sta_send_apinfo(sdata, ifsta);
882 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
883 sdata->local->hw.conf.channel->center_freq,
884 ifsta->ssid, ifsta->ssid_len);
885 return;
886 }
887
888 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
889 printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
890 sdata->dev->name, ifsta->bssid);
891
892 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
893
894 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
895 }
896
897 /*
898 * The disassoc 'reason' argument can be either our own reason
899 * if self disconnected or a reason code from the AP.
900 */
901 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
902 struct ieee80211_if_sta *ifsta, bool deauth,
903 bool self_disconnected, u16 reason)
904 {
905 struct ieee80211_local *local = sdata->local;
906 struct sta_info *sta;
907 u32 changed = 0, config_changed = 0;
908
909 rcu_read_lock();
910
911 sta = sta_info_get(local, ifsta->bssid);
912 if (!sta) {
913 rcu_read_unlock();
914 return;
915 }
916
917 if (deauth) {
918 ifsta->direct_probe_tries = 0;
919 ifsta->auth_tries = 0;
920 }
921 ifsta->assoc_scan_tries = 0;
922 ifsta->assoc_tries = 0;
923
924 netif_tx_stop_all_queues(sdata->dev);
925 netif_carrier_off(sdata->dev);
926
927 ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
928
929 if (self_disconnected) {
930 if (deauth)
931 ieee80211_send_deauth_disassoc(sdata,
932 IEEE80211_STYPE_DEAUTH, reason);
933 else
934 ieee80211_send_deauth_disassoc(sdata,
935 IEEE80211_STYPE_DISASSOC, reason);
936 }
937
938 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
939 changed |= ieee80211_reset_erp_info(sdata);
940
941 ieee80211_led_assoc(local, 0);
942 changed |= BSS_CHANGED_ASSOC;
943 sdata->vif.bss_conf.assoc = false;
944
945 ieee80211_sta_send_apinfo(sdata, ifsta);
946
947 if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
948 ifsta->state = IEEE80211_STA_MLME_DISABLED;
949 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
950 sdata->local->hw.conf.channel->center_freq,
951 ifsta->ssid, ifsta->ssid_len);
952 }
953
954 rcu_read_unlock();
955
956 /* channel(_type) changes are handled by ieee80211_hw_config */
957 local->oper_channel_type = NL80211_CHAN_NO_HT;
958
959 local->power_constr_level = 0;
960
961 del_timer_sync(&local->dynamic_ps_timer);
962 cancel_work_sync(&local->dynamic_ps_enable_work);
963
964 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
965 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
966 config_changed |= IEEE80211_CONF_CHANGE_PS;
967 }
968
969 ieee80211_hw_config(local, config_changed);
970 ieee80211_bss_info_change_notify(sdata, changed);
971
972 rcu_read_lock();
973
974 sta = sta_info_get(local, ifsta->bssid);
975 if (!sta) {
976 rcu_read_unlock();
977 return;
978 }
979
980 sta_info_unlink(&sta);
981
982 rcu_read_unlock();
983
984 sta_info_destroy(sta);
985 }
986
987 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
988 {
989 if (!sdata || !sdata->default_key ||
990 sdata->default_key->conf.alg != ALG_WEP)
991 return 0;
992 return 1;
993 }
994
995 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
996 struct ieee80211_if_sta *ifsta)
997 {
998 struct ieee80211_local *local = sdata->local;
999 struct ieee80211_bss *bss;
1000 int bss_privacy;
1001 int wep_privacy;
1002 int privacy_invoked;
1003
1004 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
1005 return 0;
1006
1007 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1008 local->hw.conf.channel->center_freq,
1009 ifsta->ssid, ifsta->ssid_len);
1010 if (!bss)
1011 return 0;
1012
1013 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
1014 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1015 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
1016
1017 ieee80211_rx_bss_put(local, bss);
1018
1019 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1020 return 0;
1021
1022 return 1;
1023 }
1024
1025 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1026 struct ieee80211_if_sta *ifsta)
1027 {
1028 ifsta->assoc_tries++;
1029 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1030 printk(KERN_DEBUG "%s: association with AP %pM"
1031 " timed out\n",
1032 sdata->dev->name, ifsta->bssid);
1033 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1034 ieee80211_sta_send_apinfo(sdata, ifsta);
1035 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
1036 sdata->local->hw.conf.channel->center_freq,
1037 ifsta->ssid, ifsta->ssid_len);
1038 return;
1039 }
1040
1041 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1042 printk(KERN_DEBUG "%s: associate with AP %pM\n",
1043 sdata->dev->name, ifsta->bssid);
1044 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1045 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1046 "mixed-cell disabled - abort association\n", sdata->dev->name);
1047 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1048 return;
1049 }
1050
1051 ieee80211_send_assoc(sdata, ifsta);
1052
1053 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1054 }
1055
1056
1057 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1058 struct ieee80211_if_sta *ifsta)
1059 {
1060 struct ieee80211_local *local = sdata->local;
1061 struct sta_info *sta;
1062 int disassoc;
1063
1064 /* TODO: start monitoring current AP signal quality and number of
1065 * missed beacons. Scan other channels every now and then and search
1066 * for better APs. */
1067 /* TODO: remove expired BSSes */
1068
1069 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1070
1071 rcu_read_lock();
1072
1073 sta = sta_info_get(local, ifsta->bssid);
1074 if (!sta) {
1075 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1076 sdata->dev->name, ifsta->bssid);
1077 disassoc = 1;
1078 } else {
1079 disassoc = 0;
1080 if (time_after(jiffies,
1081 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1082 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1083 printk(KERN_DEBUG "%s: No ProbeResp from "
1084 "current AP %pM - assume out of "
1085 "range\n",
1086 sdata->dev->name, ifsta->bssid);
1087 disassoc = 1;
1088 } else
1089 ieee80211_send_probe_req(sdata, ifsta->bssid,
1090 ifsta->ssid,
1091 ifsta->ssid_len);
1092 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1093 } else {
1094 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1095 if (time_after(jiffies, ifsta->last_probe +
1096 IEEE80211_PROBE_INTERVAL)) {
1097 ifsta->last_probe = jiffies;
1098 ieee80211_send_probe_req(sdata, ifsta->bssid,
1099 ifsta->ssid,
1100 ifsta->ssid_len);
1101 }
1102 }
1103 }
1104
1105 rcu_read_unlock();
1106
1107 if (disassoc)
1108 ieee80211_set_disassoc(sdata, ifsta, true, true,
1109 WLAN_REASON_PREV_AUTH_NOT_VALID);
1110 else
1111 mod_timer(&ifsta->timer, jiffies +
1112 IEEE80211_MONITORING_INTERVAL);
1113 }
1114
1115
1116 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1117 struct ieee80211_if_sta *ifsta)
1118 {
1119 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1120 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1121 ieee80211_associate(sdata, ifsta);
1122 }
1123
1124
1125 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1126 struct ieee80211_if_sta *ifsta,
1127 struct ieee80211_mgmt *mgmt,
1128 size_t len)
1129 {
1130 u8 *pos;
1131 struct ieee802_11_elems elems;
1132
1133 pos = mgmt->u.auth.variable;
1134 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1135 if (!elems.challenge)
1136 return;
1137 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1138 elems.challenge_len + 2, 1);
1139 }
1140
1141 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1142 struct ieee80211_if_sta *ifsta,
1143 struct ieee80211_mgmt *mgmt,
1144 size_t len)
1145 {
1146 u16 auth_alg, auth_transaction, status_code;
1147
1148 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1149 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1150 return;
1151
1152 if (len < 24 + 6)
1153 return;
1154
1155 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1156 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1157 return;
1158
1159 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1160 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1161 return;
1162
1163 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1164 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1165 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1166
1167 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1168 /*
1169 * IEEE 802.11 standard does not require authentication in IBSS
1170 * networks and most implementations do not seem to use it.
1171 * However, try to reply to authentication attempts if someone
1172 * has actually implemented this.
1173 */
1174 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1175 return;
1176 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1177 }
1178
1179 if (auth_alg != ifsta->auth_alg ||
1180 auth_transaction != ifsta->auth_transaction)
1181 return;
1182
1183 if (status_code != WLAN_STATUS_SUCCESS) {
1184 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1185 u8 algs[3];
1186 const int num_algs = ARRAY_SIZE(algs);
1187 int i, pos;
1188 algs[0] = algs[1] = algs[2] = 0xff;
1189 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1190 algs[0] = WLAN_AUTH_OPEN;
1191 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1192 algs[1] = WLAN_AUTH_SHARED_KEY;
1193 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1194 algs[2] = WLAN_AUTH_LEAP;
1195 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1196 pos = 0;
1197 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1198 pos = 1;
1199 else
1200 pos = 2;
1201 for (i = 0; i < num_algs; i++) {
1202 pos++;
1203 if (pos >= num_algs)
1204 pos = 0;
1205 if (algs[pos] == ifsta->auth_alg ||
1206 algs[pos] == 0xff)
1207 continue;
1208 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1209 !ieee80211_sta_wep_configured(sdata))
1210 continue;
1211 ifsta->auth_alg = algs[pos];
1212 break;
1213 }
1214 }
1215 return;
1216 }
1217
1218 switch (ifsta->auth_alg) {
1219 case WLAN_AUTH_OPEN:
1220 case WLAN_AUTH_LEAP:
1221 ieee80211_auth_completed(sdata, ifsta);
1222 break;
1223 case WLAN_AUTH_SHARED_KEY:
1224 if (ifsta->auth_transaction == 4)
1225 ieee80211_auth_completed(sdata, ifsta);
1226 else
1227 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1228 break;
1229 }
1230 }
1231
1232
1233 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1234 struct ieee80211_if_sta *ifsta,
1235 struct ieee80211_mgmt *mgmt,
1236 size_t len)
1237 {
1238 u16 reason_code;
1239
1240 if (len < 24 + 2)
1241 return;
1242
1243 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1244 return;
1245
1246 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1247
1248 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1249 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1250 sdata->dev->name, reason_code);
1251
1252 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1253 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1254 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1255 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1256 mod_timer(&ifsta->timer, jiffies +
1257 IEEE80211_RETRY_AUTH_INTERVAL);
1258 }
1259
1260 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1261 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1262 }
1263
1264
1265 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1266 struct ieee80211_if_sta *ifsta,
1267 struct ieee80211_mgmt *mgmt,
1268 size_t len)
1269 {
1270 u16 reason_code;
1271
1272 if (len < 24 + 2)
1273 return;
1274
1275 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1276 return;
1277
1278 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1279
1280 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1281 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1282 sdata->dev->name, reason_code);
1283
1284 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1285 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1286 mod_timer(&ifsta->timer, jiffies +
1287 IEEE80211_RETRY_AUTH_INTERVAL);
1288 }
1289
1290 ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1291 }
1292
1293
1294 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1295 struct ieee80211_if_sta *ifsta,
1296 struct ieee80211_mgmt *mgmt,
1297 size_t len,
1298 int reassoc)
1299 {
1300 struct ieee80211_local *local = sdata->local;
1301 struct ieee80211_supported_band *sband;
1302 struct sta_info *sta;
1303 u32 rates, basic_rates;
1304 u16 capab_info, status_code, aid;
1305 struct ieee802_11_elems elems;
1306 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1307 u8 *pos;
1308 u32 changed = 0;
1309 int i, j;
1310 bool have_higher_than_11mbit = false, newsta = false;
1311 u16 ap_ht_cap_flags;
1312
1313 /* AssocResp and ReassocResp have identical structure, so process both
1314 * of them in this function. */
1315
1316 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1317 return;
1318
1319 if (len < 24 + 6)
1320 return;
1321
1322 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1323 return;
1324
1325 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1326 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1327 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1328
1329 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1330 "status=%d aid=%d)\n",
1331 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1332 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1333
1334 pos = mgmt->u.assoc_resp.variable;
1335 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1336
1337 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1338 elems.timeout_int && elems.timeout_int_len == 5 &&
1339 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1340 u32 tu, ms;
1341 tu = get_unaligned_le32(elems.timeout_int + 1);
1342 ms = tu * 1024 / 1000;
1343 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1344 "comeback duration %u TU (%u ms)\n",
1345 sdata->dev->name, tu, ms);
1346 if (ms > IEEE80211_ASSOC_TIMEOUT)
1347 mod_timer(&ifsta->timer,
1348 jiffies + msecs_to_jiffies(ms));
1349 return;
1350 }
1351
1352 if (status_code != WLAN_STATUS_SUCCESS) {
1353 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1354 sdata->dev->name, status_code);
1355 /* if this was a reassociation, ensure we try a "full"
1356 * association next time. This works around some broken APs
1357 * which do not correctly reject reassociation requests. */
1358 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1359 return;
1360 }
1361
1362 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1363 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1364 "set\n", sdata->dev->name, aid);
1365 aid &= ~(BIT(15) | BIT(14));
1366
1367 if (!elems.supp_rates) {
1368 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1369 sdata->dev->name);
1370 return;
1371 }
1372
1373 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1374 ifsta->aid = aid;
1375 ifsta->ap_capab = capab_info;
1376
1377 kfree(ifsta->assocresp_ies);
1378 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1379 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1380 if (ifsta->assocresp_ies)
1381 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1382
1383 rcu_read_lock();
1384
1385 /* Add STA entry for the AP */
1386 sta = sta_info_get(local, ifsta->bssid);
1387 if (!sta) {
1388 struct ieee80211_bss *bss;
1389
1390 newsta = true;
1391
1392 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1393 if (!sta) {
1394 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1395 " the AP\n", sdata->dev->name);
1396 rcu_read_unlock();
1397 return;
1398 }
1399 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1400 local->hw.conf.channel->center_freq,
1401 ifsta->ssid, ifsta->ssid_len);
1402 if (bss) {
1403 sta->last_signal = bss->signal;
1404 sta->last_qual = bss->qual;
1405 sta->last_noise = bss->noise;
1406 ieee80211_rx_bss_put(local, bss);
1407 }
1408
1409 /* update new sta with its last rx activity */
1410 sta->last_rx = jiffies;
1411 }
1412
1413 /*
1414 * FIXME: Do we really need to update the sta_info's information here?
1415 * We already know about the AP (we found it in our list) so it
1416 * should already be filled with the right info, no?
1417 * As is stands, all this is racy because typically we assume
1418 * the information that is filled in here (except flags) doesn't
1419 * change while a STA structure is alive. As such, it should move
1420 * to between the sta_info_alloc() and sta_info_insert() above.
1421 */
1422
1423 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1424 WLAN_STA_AUTHORIZED);
1425
1426 rates = 0;
1427 basic_rates = 0;
1428 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1429
1430 for (i = 0; i < elems.supp_rates_len; i++) {
1431 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1432 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1433
1434 if (rate > 110)
1435 have_higher_than_11mbit = true;
1436
1437 for (j = 0; j < sband->n_bitrates; j++) {
1438 if (sband->bitrates[j].bitrate == rate) {
1439 rates |= BIT(j);
1440 if (is_basic)
1441 basic_rates |= BIT(j);
1442 break;
1443 }
1444 }
1445 }
1446
1447 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1448 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1449 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1450
1451 if (rate > 110)
1452 have_higher_than_11mbit = true;
1453
1454 for (j = 0; j < sband->n_bitrates; j++) {
1455 if (sband->bitrates[j].bitrate == rate) {
1456 rates |= BIT(j);
1457 if (is_basic)
1458 basic_rates |= BIT(j);
1459 break;
1460 }
1461 }
1462 }
1463
1464 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1465 sdata->vif.bss_conf.basic_rates = basic_rates;
1466
1467 /* cf. IEEE 802.11 9.2.12 */
1468 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1469 have_higher_than_11mbit)
1470 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1471 else
1472 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1473
1474 if (elems.ht_cap_elem)
1475 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1476 elems.ht_cap_elem, &sta->sta.ht_cap);
1477
1478 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1479
1480 rate_control_rate_init(sta);
1481
1482 if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
1483 set_sta_flags(sta, WLAN_STA_MFP);
1484
1485 if (elems.wmm_param)
1486 set_sta_flags(sta, WLAN_STA_WME);
1487
1488 if (newsta) {
1489 int err = sta_info_insert(sta);
1490 if (err) {
1491 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1492 " the AP (error %d)\n", sdata->dev->name, err);
1493 rcu_read_unlock();
1494 return;
1495 }
1496 }
1497
1498 rcu_read_unlock();
1499
1500 if (elems.wmm_param)
1501 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1502 elems.wmm_param_len);
1503
1504 if (elems.ht_info_elem && elems.wmm_param &&
1505 (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1506 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1507 ap_ht_cap_flags);
1508
1509 /* set AID and assoc capability,
1510 * ieee80211_set_associated() will tell the driver */
1511 bss_conf->aid = aid;
1512 bss_conf->assoc_capability = capab_info;
1513 ieee80211_set_associated(sdata, ifsta, changed);
1514
1515 ieee80211_associated(sdata, ifsta);
1516 }
1517
1518
1519 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1520 struct ieee80211_if_sta *ifsta,
1521 struct ieee80211_bss *bss)
1522 {
1523 struct ieee80211_local *local = sdata->local;
1524 int res = 0, rates, i, j;
1525 struct sk_buff *skb;
1526 struct ieee80211_mgmt *mgmt;
1527 u8 *pos;
1528 struct ieee80211_supported_band *sband;
1529 union iwreq_data wrqu;
1530
1531 if (local->ops->reset_tsf) {
1532 /* Reset own TSF to allow time synchronization work. */
1533 local->ops->reset_tsf(local_to_hw(local));
1534 }
1535
1536 if ((ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) &&
1537 memcmp(ifsta->bssid, bss->bssid, ETH_ALEN) == 0)
1538 return res;
1539
1540 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
1541 sdata->u.sta.ie_proberesp_len);
1542 if (!skb) {
1543 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1544 "response\n", sdata->dev->name);
1545 return -ENOMEM;
1546 }
1547
1548 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1549
1550 if (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) {
1551 /* Remove possible STA entries from other IBSS networks. */
1552 sta_info_flush_delayed(sdata);
1553 }
1554
1555 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1556 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1557 if (res)
1558 return res;
1559
1560 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1561
1562 sdata->drop_unencrypted = bss->capability &
1563 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1564
1565 res = ieee80211_set_freq(sdata, bss->freq);
1566
1567 if (res)
1568 return res;
1569
1570 /* Build IBSS probe response */
1571
1572 skb_reserve(skb, local->hw.extra_tx_headroom);
1573
1574 mgmt = (struct ieee80211_mgmt *)
1575 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1576 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1577 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1578 IEEE80211_STYPE_PROBE_RESP);
1579 memset(mgmt->da, 0xff, ETH_ALEN);
1580 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1581 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1582 mgmt->u.beacon.beacon_int =
1583 cpu_to_le16(local->hw.conf.beacon_int);
1584 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1585 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1586
1587 pos = skb_put(skb, 2 + ifsta->ssid_len);
1588 *pos++ = WLAN_EID_SSID;
1589 *pos++ = ifsta->ssid_len;
1590 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1591
1592 rates = bss->supp_rates_len;
1593 if (rates > 8)
1594 rates = 8;
1595 pos = skb_put(skb, 2 + rates);
1596 *pos++ = WLAN_EID_SUPP_RATES;
1597 *pos++ = rates;
1598 memcpy(pos, bss->supp_rates, rates);
1599
1600 if (bss->band == IEEE80211_BAND_2GHZ) {
1601 pos = skb_put(skb, 2 + 1);
1602 *pos++ = WLAN_EID_DS_PARAMS;
1603 *pos++ = 1;
1604 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1605 }
1606
1607 pos = skb_put(skb, 2 + 2);
1608 *pos++ = WLAN_EID_IBSS_PARAMS;
1609 *pos++ = 2;
1610 /* FIX: set ATIM window based on scan results */
1611 *pos++ = 0;
1612 *pos++ = 0;
1613
1614 if (bss->supp_rates_len > 8) {
1615 rates = bss->supp_rates_len - 8;
1616 pos = skb_put(skb, 2 + rates);
1617 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1618 *pos++ = rates;
1619 memcpy(pos, &bss->supp_rates[8], rates);
1620 }
1621
1622 add_extra_ies(skb, sdata->u.sta.ie_proberesp,
1623 sdata->u.sta.ie_proberesp_len);
1624
1625 ifsta->probe_resp = skb;
1626
1627 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON |
1628 IEEE80211_IFCC_BEACON_ENABLED);
1629
1630
1631 rates = 0;
1632 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1633 for (i = 0; i < bss->supp_rates_len; i++) {
1634 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1635 for (j = 0; j < sband->n_bitrates; j++)
1636 if (sband->bitrates[j].bitrate == bitrate)
1637 rates |= BIT(j);
1638 }
1639 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1640
1641 ieee80211_sta_def_wmm_params(sdata, bss);
1642
1643 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
1644 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1645 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1646
1647 ieee80211_led_assoc(local, true);
1648
1649 memset(&wrqu, 0, sizeof(wrqu));
1650 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1651 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1652
1653 return res;
1654 }
1655
1656 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1657 struct ieee80211_mgmt *mgmt,
1658 size_t len,
1659 struct ieee80211_rx_status *rx_status,
1660 struct ieee802_11_elems *elems,
1661 bool beacon)
1662 {
1663 struct ieee80211_local *local = sdata->local;
1664 int freq;
1665 struct ieee80211_bss *bss;
1666 struct sta_info *sta;
1667 struct ieee80211_channel *channel;
1668 u64 beacon_timestamp, rx_timestamp;
1669 u32 supp_rates = 0;
1670 enum ieee80211_band band = rx_status->band;
1671
1672 if (elems->ds_params && elems->ds_params_len == 1)
1673 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1674 else
1675 freq = rx_status->freq;
1676
1677 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1678
1679 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1680 return;
1681
1682 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1683 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1684 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1685
1686 rcu_read_lock();
1687
1688 sta = sta_info_get(local, mgmt->sa);
1689 if (sta) {
1690 u32 prev_rates;
1691
1692 prev_rates = sta->sta.supp_rates[band];
1693 /* make sure mandatory rates are always added */
1694 sta->sta.supp_rates[band] = supp_rates |
1695 ieee80211_mandatory_rates(local, band);
1696
1697 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1698 if (sta->sta.supp_rates[band] != prev_rates)
1699 printk(KERN_DEBUG "%s: updated supp_rates set "
1700 "for %pM based on beacon info (0x%llx | "
1701 "0x%llx -> 0x%llx)\n",
1702 sdata->dev->name,
1703 sta->sta.addr,
1704 (unsigned long long) prev_rates,
1705 (unsigned long long) supp_rates,
1706 (unsigned long long) sta->sta.supp_rates[band]);
1707 #endif
1708 } else {
1709 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1710 }
1711
1712 rcu_read_unlock();
1713 }
1714
1715 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1716 freq, beacon);
1717 if (!bss)
1718 return;
1719
1720 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1721 (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1722 struct ieee80211_channel_sw_ie *sw_elem =
1723 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1724 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1725 }
1726
1727 /* was just updated in ieee80211_bss_info_update */
1728 beacon_timestamp = bss->timestamp;
1729
1730 /*
1731 * In STA mode, the remaining parameters should not be overridden
1732 * by beacons because they're not necessarily accurate there.
1733 */
1734 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1735 bss->last_probe_resp && beacon) {
1736 ieee80211_rx_bss_put(local, bss);
1737 return;
1738 }
1739
1740 /* check if we need to merge IBSS */
1741 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1742 (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1743 bss->capability & WLAN_CAPABILITY_IBSS &&
1744 bss->freq == local->oper_channel->center_freq &&
1745 elems->ssid_len == sdata->u.sta.ssid_len &&
1746 memcmp(elems->ssid, sdata->u.sta.ssid,
1747 sdata->u.sta.ssid_len) == 0) {
1748 if (rx_status->flag & RX_FLAG_TSFT) {
1749 /* in order for correct IBSS merging we need mactime
1750 *
1751 * since mactime is defined as the time the first data
1752 * symbol of the frame hits the PHY, and the timestamp
1753 * of the beacon is defined as "the time that the data
1754 * symbol containing the first bit of the timestamp is
1755 * transmitted to the PHY plus the transmitting STA’s
1756 * delays through its local PHY from the MAC-PHY
1757 * interface to its interface with the WM"
1758 * (802.11 11.1.2) - equals the time this bit arrives at
1759 * the receiver - we have to take into account the
1760 * offset between the two.
1761 * e.g: at 1 MBit that means mactime is 192 usec earlier
1762 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1763 */
1764 int rate;
1765 if (rx_status->flag & RX_FLAG_HT) {
1766 rate = 65; /* TODO: HT rates */
1767 } else {
1768 rate = local->hw.wiphy->bands[band]->
1769 bitrates[rx_status->rate_idx].bitrate;
1770 }
1771 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1772 } else if (local && local->ops && local->ops->get_tsf)
1773 /* second best option: get current TSF */
1774 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1775 else
1776 /* can't merge without knowing the TSF */
1777 rx_timestamp = -1LLU;
1778 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1779 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1780 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1781 mgmt->sa, mgmt->bssid,
1782 (unsigned long long)rx_timestamp,
1783 (unsigned long long)beacon_timestamp,
1784 (unsigned long long)(rx_timestamp - beacon_timestamp),
1785 jiffies);
1786 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1787 if (beacon_timestamp > rx_timestamp) {
1788 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1789 printk(KERN_DEBUG "%s: beacon TSF higher than "
1790 "local TSF - IBSS merge with BSSID %pM\n",
1791 sdata->dev->name, mgmt->bssid);
1792 #endif
1793 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1794 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1795 }
1796 }
1797
1798 ieee80211_rx_bss_put(local, bss);
1799 }
1800
1801
1802 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1803 struct ieee80211_mgmt *mgmt,
1804 size_t len,
1805 struct ieee80211_rx_status *rx_status)
1806 {
1807 size_t baselen;
1808 struct ieee802_11_elems elems;
1809 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1810
1811 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1812 return; /* ignore ProbeResp to foreign address */
1813
1814 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1815 if (baselen > len)
1816 return;
1817
1818 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1819 &elems);
1820
1821 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1822
1823 /* direct probe may be part of the association flow */
1824 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1825 &ifsta->request)) {
1826 printk(KERN_DEBUG "%s direct probe responded\n",
1827 sdata->dev->name);
1828 ieee80211_authenticate(sdata, ifsta);
1829 }
1830 }
1831
1832
1833 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1834 struct ieee80211_mgmt *mgmt,
1835 size_t len,
1836 struct ieee80211_rx_status *rx_status)
1837 {
1838 struct ieee80211_if_sta *ifsta;
1839 size_t baselen;
1840 struct ieee802_11_elems elems;
1841 struct ieee80211_local *local = sdata->local;
1842 u32 changed = 0;
1843 bool erp_valid, directed_tim, is_mc = false;
1844 u8 erp_value = 0;
1845
1846 /* Process beacon from the current BSS */
1847 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1848 if (baselen > len)
1849 return;
1850
1851 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1852
1853 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1854
1855 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1856 return;
1857 ifsta = &sdata->u.sta;
1858
1859 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1860 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1861 return;
1862
1863 if (rx_status->freq != local->hw.conf.channel->center_freq)
1864 return;
1865
1866 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1867 elems.wmm_param_len);
1868
1869 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1870 local->hw.conf.flags & IEEE80211_CONF_PS) {
1871 directed_tim = check_tim(&elems, ifsta->aid, &is_mc);
1872
1873 if (directed_tim || is_mc) {
1874 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1875 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1876 ieee80211_send_nullfunc(local, sdata, 0);
1877 }
1878 }
1879
1880 if (elems.erp_info && elems.erp_info_len >= 1) {
1881 erp_valid = true;
1882 erp_value = elems.erp_info[0];
1883 } else {
1884 erp_valid = false;
1885 }
1886 changed |= ieee80211_handle_bss_capability(sdata,
1887 le16_to_cpu(mgmt->u.beacon.capab_info),
1888 erp_valid, erp_value);
1889
1890
1891 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1892 struct sta_info *sta;
1893 struct ieee80211_supported_band *sband;
1894 u16 ap_ht_cap_flags;
1895
1896 rcu_read_lock();
1897
1898 sta = sta_info_get(local, ifsta->bssid);
1899 if (!sta) {
1900 rcu_read_unlock();
1901 return;
1902 }
1903
1904 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1905
1906 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1907 elems.ht_cap_elem, &sta->sta.ht_cap);
1908
1909 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1910
1911 rcu_read_unlock();
1912
1913 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1914 ap_ht_cap_flags);
1915 }
1916
1917 if (elems.country_elem) {
1918 /* Note we are only reviewing this on beacons
1919 * for the BSSID we are associated to */
1920 regulatory_hint_11d(local->hw.wiphy,
1921 elems.country_elem, elems.country_elem_len);
1922
1923 /* TODO: IBSS also needs this */
1924 if (elems.pwr_constr_elem)
1925 ieee80211_handle_pwr_constr(sdata,
1926 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1927 elems.pwr_constr_elem,
1928 elems.pwr_constr_elem_len);
1929 }
1930
1931 ieee80211_bss_info_change_notify(sdata, changed);
1932 }
1933
1934
1935 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1936 struct ieee80211_if_sta *ifsta,
1937 struct ieee80211_mgmt *mgmt,
1938 size_t len)
1939 {
1940 struct ieee80211_local *local = sdata->local;
1941 int tx_last_beacon;
1942 struct sk_buff *skb;
1943 struct ieee80211_mgmt *resp;
1944 u8 *pos, *end;
1945
1946 if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1947 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1948 len < 24 + 2 || !ifsta->probe_resp)
1949 return;
1950
1951 if (local->ops->tx_last_beacon)
1952 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1953 else
1954 tx_last_beacon = 1;
1955
1956 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1957 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1958 " (tx_last_beacon=%d)\n",
1959 sdata->dev->name, mgmt->sa, mgmt->da,
1960 mgmt->bssid, tx_last_beacon);
1961 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1962
1963 if (!tx_last_beacon)
1964 return;
1965
1966 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1967 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1968 return;
1969
1970 end = ((u8 *) mgmt) + len;
1971 pos = mgmt->u.probe_req.variable;
1972 if (pos[0] != WLAN_EID_SSID ||
1973 pos + 2 + pos[1] > end) {
1974 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1975 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1976 "from %pM\n",
1977 sdata->dev->name, mgmt->sa);
1978 #endif
1979 return;
1980 }
1981 if (pos[1] != 0 &&
1982 (pos[1] != ifsta->ssid_len ||
1983 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1984 /* Ignore ProbeReq for foreign SSID */
1985 return;
1986 }
1987
1988 /* Reply with ProbeResp */
1989 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1990 if (!skb)
1991 return;
1992
1993 resp = (struct ieee80211_mgmt *) skb->data;
1994 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1995 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1996 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1997 sdata->dev->name, resp->da);
1998 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1999 ieee80211_tx_skb(sdata, skb, 0);
2000 }
2001
2002 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
2003 struct ieee80211_rx_status *rx_status)
2004 {
2005 struct ieee80211_local *local = sdata->local;
2006 struct ieee80211_if_sta *ifsta;
2007 struct ieee80211_mgmt *mgmt;
2008 u16 fc;
2009
2010 if (skb->len < 24)
2011 goto fail;
2012
2013 ifsta = &sdata->u.sta;
2014
2015 mgmt = (struct ieee80211_mgmt *) skb->data;
2016 fc = le16_to_cpu(mgmt->frame_control);
2017
2018 switch (fc & IEEE80211_FCTL_STYPE) {
2019 case IEEE80211_STYPE_PROBE_REQ:
2020 case IEEE80211_STYPE_PROBE_RESP:
2021 case IEEE80211_STYPE_BEACON:
2022 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2023 case IEEE80211_STYPE_AUTH:
2024 case IEEE80211_STYPE_ASSOC_RESP:
2025 case IEEE80211_STYPE_REASSOC_RESP:
2026 case IEEE80211_STYPE_DEAUTH:
2027 case IEEE80211_STYPE_DISASSOC:
2028 skb_queue_tail(&ifsta->skb_queue, skb);
2029 queue_work(local->hw.workqueue, &ifsta->work);
2030 return;
2031 }
2032
2033 fail:
2034 kfree_skb(skb);
2035 }
2036
2037 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2038 struct sk_buff *skb)
2039 {
2040 struct ieee80211_rx_status *rx_status;
2041 struct ieee80211_if_sta *ifsta;
2042 struct ieee80211_mgmt *mgmt;
2043 u16 fc;
2044
2045 ifsta = &sdata->u.sta;
2046
2047 rx_status = (struct ieee80211_rx_status *) skb->cb;
2048 mgmt = (struct ieee80211_mgmt *) skb->data;
2049 fc = le16_to_cpu(mgmt->frame_control);
2050
2051 switch (fc & IEEE80211_FCTL_STYPE) {
2052 case IEEE80211_STYPE_PROBE_REQ:
2053 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
2054 break;
2055 case IEEE80211_STYPE_PROBE_RESP:
2056 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
2057 break;
2058 case IEEE80211_STYPE_BEACON:
2059 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2060 break;
2061 case IEEE80211_STYPE_AUTH:
2062 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2063 break;
2064 case IEEE80211_STYPE_ASSOC_RESP:
2065 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2066 break;
2067 case IEEE80211_STYPE_REASSOC_RESP:
2068 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2069 break;
2070 case IEEE80211_STYPE_DEAUTH:
2071 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2072 break;
2073 case IEEE80211_STYPE_DISASSOC:
2074 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2075 break;
2076 }
2077
2078 kfree_skb(skb);
2079 }
2080
2081
2082 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
2083 {
2084 struct ieee80211_local *local = sdata->local;
2085 int active = 0;
2086 struct sta_info *sta;
2087
2088 rcu_read_lock();
2089
2090 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2091 if (sta->sdata == sdata &&
2092 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2093 jiffies)) {
2094 active++;
2095 break;
2096 }
2097 }
2098
2099 rcu_read_unlock();
2100
2101 return active;
2102 }
2103
2104
2105 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2106 struct ieee80211_if_sta *ifsta)
2107 {
2108 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2109
2110 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2111 if (ieee80211_sta_active_ibss(sdata))
2112 return;
2113
2114 if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2115 (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2116 return;
2117
2118 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2119 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2120 ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
2121 }
2122
2123
2124 static void ieee80211_sta_timer(unsigned long data)
2125 {
2126 struct ieee80211_sub_if_data *sdata =
2127 (struct ieee80211_sub_if_data *) data;
2128 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2129 struct ieee80211_local *local = sdata->local;
2130
2131 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2132 queue_work(local->hw.workqueue, &ifsta->work);
2133 }
2134
2135 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2136 struct ieee80211_if_sta *ifsta)
2137 {
2138 struct ieee80211_local *local = sdata->local;
2139
2140 if (local->ops->reset_tsf) {
2141 /* Reset own TSF to allow time synchronization work. */
2142 local->ops->reset_tsf(local_to_hw(local));
2143 }
2144
2145 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2146
2147
2148 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2149 ifsta->auth_alg = WLAN_AUTH_OPEN;
2150 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2151 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2152 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2153 ifsta->auth_alg = WLAN_AUTH_LEAP;
2154 else
2155 ifsta->auth_alg = WLAN_AUTH_OPEN;
2156 ifsta->auth_transaction = -1;
2157 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2158 ifsta->assoc_scan_tries = 0;
2159 ifsta->direct_probe_tries = 0;
2160 ifsta->auth_tries = 0;
2161 ifsta->assoc_tries = 0;
2162 netif_tx_stop_all_queues(sdata->dev);
2163 netif_carrier_off(sdata->dev);
2164 }
2165
2166
2167 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2168 const char *ssid, int ssid_len)
2169 {
2170 int tmp, hidden_ssid;
2171
2172 if (ssid_len == ifsta->ssid_len &&
2173 !memcmp(ifsta->ssid, ssid, ssid_len))
2174 return 1;
2175
2176 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2177 return 0;
2178
2179 hidden_ssid = 1;
2180 tmp = ssid_len;
2181 while (tmp--) {
2182 if (ssid[tmp] != '\0') {
2183 hidden_ssid = 0;
2184 break;
2185 }
2186 }
2187
2188 if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2189 return 1;
2190
2191 if (ssid_len == 1 && ssid[0] == ' ')
2192 return 1;
2193
2194 return 0;
2195 }
2196
2197 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2198 struct ieee80211_if_sta *ifsta)
2199 {
2200 struct ieee80211_local *local = sdata->local;
2201 struct ieee80211_bss *bss;
2202 struct ieee80211_supported_band *sband;
2203 u8 bssid[ETH_ALEN], *pos;
2204 int i;
2205 int ret;
2206
2207 if (sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) {
2208 memcpy(bssid, ifsta->bssid, ETH_ALEN);
2209 } else {
2210 /* Generate random, not broadcast, locally administered BSSID. Mix in
2211 * own MAC address to make sure that devices that do not have proper
2212 * random number generator get different BSSID. */
2213 get_random_bytes(bssid, ETH_ALEN);
2214 for (i = 0; i < ETH_ALEN; i++)
2215 bssid[i] ^= sdata->dev->dev_addr[i];
2216 bssid[0] &= ~0x01;
2217 bssid[0] |= 0x02;
2218 }
2219
2220 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2221 sdata->dev->name, bssid);
2222
2223 bss = ieee80211_rx_bss_add(local, bssid,
2224 local->hw.conf.channel->center_freq,
2225 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2226 if (!bss)
2227 return -ENOMEM;
2228
2229 bss->band = local->hw.conf.channel->band;
2230 sband = local->hw.wiphy->bands[bss->band];
2231
2232 if (local->hw.conf.beacon_int == 0)
2233 local->hw.conf.beacon_int = 100;
2234 bss->beacon_int = local->hw.conf.beacon_int;
2235 bss->last_update = jiffies;
2236 bss->capability = WLAN_CAPABILITY_IBSS;
2237
2238 if (sdata->default_key)
2239 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2240 else
2241 sdata->drop_unencrypted = 0;
2242
2243 bss->supp_rates_len = sband->n_bitrates;
2244 pos = bss->supp_rates;
2245 for (i = 0; i < sband->n_bitrates; i++) {
2246 int rate = sband->bitrates[i].bitrate;
2247 *pos++ = (u8) (rate / 5);
2248 }
2249
2250 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2251 ieee80211_rx_bss_put(local, bss);
2252 return ret;
2253 }
2254
2255
2256 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2257 struct ieee80211_if_sta *ifsta)
2258 {
2259 struct ieee80211_local *local = sdata->local;
2260 struct ieee80211_bss *bss;
2261 int found = 0;
2262 u8 bssid[ETH_ALEN];
2263 int active_ibss;
2264
2265 if (ifsta->ssid_len == 0)
2266 return -EINVAL;
2267
2268 active_ibss = ieee80211_sta_active_ibss(sdata);
2269 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2270 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2271 sdata->dev->name, active_ibss);
2272 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2273 spin_lock_bh(&local->bss_lock);
2274 list_for_each_entry(bss, &local->bss_list, list) {
2275 if (ifsta->ssid_len != bss->ssid_len ||
2276 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2277 || !(bss->capability & WLAN_CAPABILITY_IBSS))
2278 continue;
2279 if ((ifsta->flags & IEEE80211_STA_BSSID_SET) &&
2280 memcmp(ifsta->bssid, bss->bssid, ETH_ALEN) != 0)
2281 continue;
2282 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2283 printk(KERN_DEBUG " bssid=%pM found\n", bss->bssid);
2284 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2285 memcpy(bssid, bss->bssid, ETH_ALEN);
2286 found = 1;
2287 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2288 break;
2289 }
2290 spin_unlock_bh(&local->bss_lock);
2291
2292 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2293 if (found)
2294 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
2295 "%pM\n", bssid, ifsta->bssid);
2296 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2297
2298 if (found &&
2299 ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2300 memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0)) {
2301 int ret;
2302 int search_freq;
2303
2304 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2305 search_freq = bss->freq;
2306 else
2307 search_freq = local->hw.conf.channel->center_freq;
2308
2309 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2310 ifsta->ssid, ifsta->ssid_len);
2311 if (!bss)
2312 goto dont_join;
2313
2314 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2315 " based on configured SSID\n",
2316 sdata->dev->name, bssid);
2317 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2318 ieee80211_rx_bss_put(local, bss);
2319 return ret;
2320 }
2321
2322 dont_join:
2323 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2324 printk(KERN_DEBUG " did not try to join ibss\n");
2325 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2326
2327 /* Selected IBSS not found in current scan results - try to scan */
2328 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2329 !ieee80211_sta_active_ibss(sdata)) {
2330 mod_timer(&ifsta->timer, jiffies +
2331 IEEE80211_IBSS_MERGE_INTERVAL);
2332 } else if (time_after(jiffies, local->last_scan_completed +
2333 IEEE80211_SCAN_INTERVAL)) {
2334 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2335 "join\n", sdata->dev->name);
2336 return ieee80211_request_scan(sdata, ifsta->ssid,
2337 ifsta->ssid_len);
2338 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2339 int interval = IEEE80211_SCAN_INTERVAL;
2340
2341 if (time_after(jiffies, ifsta->ibss_join_req +
2342 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2343 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2344 (!(local->oper_channel->flags &
2345 IEEE80211_CHAN_NO_IBSS)))
2346 return ieee80211_sta_create_ibss(sdata, ifsta);
2347 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2348 printk(KERN_DEBUG "%s: IBSS not allowed on"
2349 " %d MHz\n", sdata->dev->name,
2350 local->hw.conf.channel->center_freq);
2351 }
2352
2353 /* No IBSS found - decrease scan interval and continue
2354 * scanning. */
2355 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2356 }
2357
2358 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2359 mod_timer(&ifsta->timer, jiffies + interval);
2360 return 0;
2361 }
2362
2363 return 0;
2364 }
2365
2366
2367 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2368 struct ieee80211_if_sta *ifsta)
2369 {
2370 struct ieee80211_local *local = sdata->local;
2371 struct ieee80211_bss *bss, *selected = NULL;
2372 int top_rssi = 0, freq;
2373
2374 spin_lock_bh(&local->bss_lock);
2375 freq = local->oper_channel->center_freq;
2376 list_for_each_entry(bss, &local->bss_list, list) {
2377 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2378 continue;
2379
2380 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2381 IEEE80211_STA_AUTO_BSSID_SEL |
2382 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2383 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2384 !!sdata->default_key))
2385 continue;
2386
2387 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2388 bss->freq != freq)
2389 continue;
2390
2391 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2392 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2393 continue;
2394
2395 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2396 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2397 continue;
2398
2399 if (!selected || top_rssi < bss->signal) {
2400 selected = bss;
2401 top_rssi = bss->signal;
2402 }
2403 }
2404 if (selected)
2405 atomic_inc(&selected->users);
2406 spin_unlock_bh(&local->bss_lock);
2407
2408 if (selected) {
2409 ieee80211_set_freq(sdata, selected->freq);
2410 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2411 ieee80211_sta_set_ssid(sdata, selected->ssid,
2412 selected->ssid_len);
2413 ieee80211_sta_set_bssid(sdata, selected->bssid);
2414 ieee80211_sta_def_wmm_params(sdata, selected);
2415 if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
2416 sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
2417 else
2418 sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
2419
2420 /* Send out direct probe if no probe resp was received or
2421 * the one we have is outdated
2422 */
2423 if (!selected->last_probe_resp ||
2424 time_after(jiffies, selected->last_probe_resp
2425 + IEEE80211_SCAN_RESULT_EXPIRE))
2426 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2427 else
2428 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2429
2430 ieee80211_rx_bss_put(local, selected);
2431 ieee80211_sta_reset_auth(sdata, ifsta);
2432 return 0;
2433 } else {
2434 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2435 ifsta->assoc_scan_tries++;
2436 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2437 ieee80211_start_scan(sdata, NULL, 0);
2438 else
2439 ieee80211_start_scan(sdata, ifsta->ssid,
2440 ifsta->ssid_len);
2441 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2442 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2443 } else {
2444 ifsta->assoc_scan_tries = 0;
2445 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2446 }
2447 }
2448 return -1;
2449 }
2450
2451
2452 static void ieee80211_sta_work(struct work_struct *work)
2453 {
2454 struct ieee80211_sub_if_data *sdata =
2455 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2456 struct ieee80211_local *local = sdata->local;
2457 struct ieee80211_if_sta *ifsta;
2458 struct sk_buff *skb;
2459
2460 if (!netif_running(sdata->dev))
2461 return;
2462
2463 if (local->sw_scanning || local->hw_scanning)
2464 return;
2465
2466 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2467 sdata->vif.type != NL80211_IFTYPE_ADHOC))
2468 return;
2469 ifsta = &sdata->u.sta;
2470
2471 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2472 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2473
2474 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2475 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2476 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2477 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2478 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2479 ifsta->scan_ssid_len);
2480 return;
2481 }
2482
2483 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2484 if (ieee80211_sta_config_auth(sdata, ifsta))
2485 return;
2486 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2487 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2488 return;
2489
2490 switch (ifsta->state) {
2491 case IEEE80211_STA_MLME_DISABLED:
2492 break;
2493 case IEEE80211_STA_MLME_DIRECT_PROBE:
2494 ieee80211_direct_probe(sdata, ifsta);
2495 break;
2496 case IEEE80211_STA_MLME_AUTHENTICATE:
2497 ieee80211_authenticate(sdata, ifsta);
2498 break;
2499 case IEEE80211_STA_MLME_ASSOCIATE:
2500 ieee80211_associate(sdata, ifsta);
2501 break;
2502 case IEEE80211_STA_MLME_ASSOCIATED:
2503 ieee80211_associated(sdata, ifsta);
2504 break;
2505 case IEEE80211_STA_MLME_IBSS_SEARCH:
2506 ieee80211_sta_find_ibss(sdata, ifsta);
2507 break;
2508 case IEEE80211_STA_MLME_IBSS_JOINED:
2509 ieee80211_sta_merge_ibss(sdata, ifsta);
2510 break;
2511 default:
2512 WARN_ON(1);
2513 break;
2514 }
2515
2516 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2517 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2518 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2519
2520 ieee80211_set_disassoc(sdata, ifsta, false, true,
2521 WLAN_REASON_UNSPECIFIED);
2522 }
2523 }
2524
2525 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2526 {
2527 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2528 queue_work(sdata->local->hw.workqueue,
2529 &sdata->u.sta.work);
2530 }
2531
2532 /* interface setup */
2533 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2534 {
2535 struct ieee80211_if_sta *ifsta;
2536
2537 ifsta = &sdata->u.sta;
2538 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2539 INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2540 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2541 (unsigned long) sdata);
2542 setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2543 (unsigned long) sdata);
2544 skb_queue_head_init(&ifsta->skb_queue);
2545
2546 ifsta->capab = WLAN_CAPABILITY_ESS;
2547 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2548 IEEE80211_AUTH_ALG_SHARED_KEY;
2549 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2550 IEEE80211_STA_AUTO_BSSID_SEL |
2551 IEEE80211_STA_AUTO_CHANNEL_SEL;
2552 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2553 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2554 }
2555
2556 /*
2557 * Add a new IBSS station, will also be called by the RX code when,
2558 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2559 * must be callable in atomic context.
2560 */
2561 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2562 u8 *bssid,u8 *addr, u32 supp_rates)
2563 {
2564 struct ieee80211_local *local = sdata->local;
2565 struct sta_info *sta;
2566 int band = local->hw.conf.channel->band;
2567
2568 /* TODO: Could consider removing the least recently used entry and
2569 * allow new one to be added. */
2570 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2571 if (net_ratelimit()) {
2572 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2573 "entry %pM\n", sdata->dev->name, addr);
2574 }
2575 return NULL;
2576 }
2577
2578 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2579 return NULL;
2580
2581 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2582 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2583 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2584 #endif
2585
2586 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2587 if (!sta)
2588 return NULL;
2589
2590 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2591
2592 /* make sure mandatory rates are always added */
2593 sta->sta.supp_rates[band] = supp_rates |
2594 ieee80211_mandatory_rates(local, band);
2595
2596 rate_control_rate_init(sta);
2597
2598 if (sta_info_insert(sta))
2599 return NULL;
2600
2601 return sta;
2602 }
2603
2604 /* configuration hooks */
2605 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2606 struct ieee80211_if_sta *ifsta)
2607 {
2608 struct ieee80211_local *local = sdata->local;
2609
2610 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2611 return;
2612
2613 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2614 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2615 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2616 IEEE80211_STA_AUTO_SSID_SEL))) {
2617
2618 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2619 ieee80211_set_disassoc(sdata, ifsta, true, true,
2620 WLAN_REASON_DEAUTH_LEAVING);
2621
2622 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2623 queue_work(local->hw.workqueue, &ifsta->work);
2624 }
2625 }
2626
2627 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2628 {
2629 struct ieee80211_if_sta *ifsta;
2630
2631 if (len > IEEE80211_MAX_SSID_LEN)
2632 return -EINVAL;
2633
2634 ifsta = &sdata->u.sta;
2635
2636 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2637 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2638 memcpy(ifsta->ssid, ssid, len);
2639 ifsta->ssid_len = len;
2640 }
2641
2642 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2643
2644 if (len)
2645 ifsta->flags |= IEEE80211_STA_SSID_SET;
2646 else
2647 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2648
2649 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2650 ifsta->ibss_join_req = jiffies;
2651 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2652 return ieee80211_sta_find_ibss(sdata, ifsta);
2653 }
2654
2655 return 0;
2656 }
2657
2658 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2659 {
2660 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2661 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2662 *len = ifsta->ssid_len;
2663 return 0;
2664 }
2665
2666 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2667 {
2668 struct ieee80211_if_sta *ifsta;
2669
2670 ifsta = &sdata->u.sta;
2671
2672 if (is_valid_ether_addr(bssid)) {
2673 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2674 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2675 } else {
2676 memset(ifsta->bssid, 0, ETH_ALEN);
2677 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2678 }
2679
2680 if (netif_running(sdata->dev)) {
2681 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2682 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2683 "the low-level driver\n", sdata->dev->name);
2684 }
2685 }
2686
2687 return ieee80211_sta_set_ssid(sdata, ifsta->ssid, ifsta->ssid_len);
2688 }
2689
2690 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2691 {
2692 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2693
2694 kfree(ifsta->extra_ie);
2695 if (len == 0) {
2696 ifsta->extra_ie = NULL;
2697 ifsta->extra_ie_len = 0;
2698 return 0;
2699 }
2700 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2701 if (!ifsta->extra_ie) {
2702 ifsta->extra_ie_len = 0;
2703 return -ENOMEM;
2704 }
2705 memcpy(ifsta->extra_ie, ie, len);
2706 ifsta->extra_ie_len = len;
2707 return 0;
2708 }
2709
2710 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2711 {
2712 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2713
2714 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2715 sdata->dev->name, reason);
2716
2717 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2718 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2719 return -EINVAL;
2720
2721 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2722 return 0;
2723 }
2724
2725 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2726 {
2727 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2728
2729 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2730 sdata->dev->name, reason);
2731
2732 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2733 return -EINVAL;
2734
2735 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2736 return -1;
2737
2738 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2739 return 0;
2740 }
2741
2742 /* scan finished notification */
2743 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2744 {
2745 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2746 struct ieee80211_if_sta *ifsta;
2747
2748 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2749 ifsta = &sdata->u.sta;
2750 if ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2751 !ieee80211_sta_active_ibss(sdata))
2752 ieee80211_sta_find_ibss(sdata, ifsta);
2753 }
2754
2755 /* Restart STA timers */
2756 rcu_read_lock();
2757 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2758 ieee80211_restart_sta_timer(sdata);
2759 rcu_read_unlock();
2760 }
2761
2762 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2763 {
2764 struct ieee80211_local *local =
2765 container_of(work, struct ieee80211_local,
2766 dynamic_ps_disable_work);
2767
2768 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2769 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2770 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2771 }
2772
2773 ieee80211_wake_queues_by_reason(&local->hw,
2774 IEEE80211_QUEUE_STOP_REASON_PS);
2775 }
2776
2777 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2778 {
2779 struct ieee80211_local *local =
2780 container_of(work, struct ieee80211_local,
2781 dynamic_ps_enable_work);
2782 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2783
2784 if (local->hw.conf.flags & IEEE80211_CONF_PS)
2785 return;
2786
2787 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2788 ieee80211_send_nullfunc(local, sdata, 1);
2789
2790 local->hw.conf.flags |= IEEE80211_CONF_PS;
2791 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2792 }
2793
2794 void ieee80211_dynamic_ps_timer(unsigned long data)
2795 {
2796 struct ieee80211_local *local = (void *) data;
2797
2798 queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2799 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree