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mac80211: Handle power constraint level advertised in 11d+h beacon
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / mlme.c
blobf0d42498c257791fd49d123a5a0a7df7568775ac
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 u64 *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 u64 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 u64 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 /* also used by scanning code */
135 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
136 u8 *ssid, size_t ssid_len)
137 {
138 struct ieee80211_local *local = sdata->local;
139 struct ieee80211_supported_band *sband;
140 struct sk_buff *skb;
141 struct ieee80211_mgmt *mgmt;
142 u8 *pos, *supp_rates, *esupp_rates = NULL;
143 int i;
144
145 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
146 if (!skb) {
147 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
148 "request\n", sdata->dev->name);
149 return;
150 }
151 skb_reserve(skb, local->hw.extra_tx_headroom);
152
153 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
154 memset(mgmt, 0, 24);
155 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
156 IEEE80211_STYPE_PROBE_REQ);
157 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
158 if (dst) {
159 memcpy(mgmt->da, dst, ETH_ALEN);
160 memcpy(mgmt->bssid, dst, ETH_ALEN);
161 } else {
162 memset(mgmt->da, 0xff, ETH_ALEN);
163 memset(mgmt->bssid, 0xff, ETH_ALEN);
164 }
165 pos = skb_put(skb, 2 + ssid_len);
166 *pos++ = WLAN_EID_SSID;
167 *pos++ = ssid_len;
168 memcpy(pos, ssid, ssid_len);
169
170 supp_rates = skb_put(skb, 2);
171 supp_rates[0] = WLAN_EID_SUPP_RATES;
172 supp_rates[1] = 0;
173 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
174
175 for (i = 0; i < sband->n_bitrates; i++) {
176 struct ieee80211_rate *rate = &sband->bitrates[i];
177 if (esupp_rates) {
178 pos = skb_put(skb, 1);
179 esupp_rates[1]++;
180 } else if (supp_rates[1] == 8) {
181 esupp_rates = skb_put(skb, 3);
182 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
183 esupp_rates[1] = 1;
184 pos = &esupp_rates[2];
185 } else {
186 pos = skb_put(skb, 1);
187 supp_rates[1]++;
188 }
189 *pos = rate->bitrate / 5;
190 }
191
192 ieee80211_tx_skb(sdata, skb, 0);
193 }
194
195 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
196 struct ieee80211_if_sta *ifsta,
197 int transaction, u8 *extra, size_t extra_len,
198 int encrypt)
199 {
200 struct ieee80211_local *local = sdata->local;
201 struct sk_buff *skb;
202 struct ieee80211_mgmt *mgmt;
203
204 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
205 sizeof(*mgmt) + 6 + extra_len);
206 if (!skb) {
207 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
208 "frame\n", sdata->dev->name);
209 return;
210 }
211 skb_reserve(skb, local->hw.extra_tx_headroom);
212
213 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
214 memset(mgmt, 0, 24 + 6);
215 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
216 IEEE80211_STYPE_AUTH);
217 if (encrypt)
218 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
219 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
220 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
221 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
222 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
223 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
224 ifsta->auth_transaction = transaction + 1;
225 mgmt->u.auth.status_code = cpu_to_le16(0);
226 if (extra)
227 memcpy(skb_put(skb, extra_len), extra, extra_len);
228
229 ieee80211_tx_skb(sdata, skb, encrypt);
230 }
231
232 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
233 struct ieee80211_if_sta *ifsta)
234 {
235 struct ieee80211_local *local = sdata->local;
236 struct sk_buff *skb;
237 struct ieee80211_mgmt *mgmt;
238 u8 *pos, *ies, *ht_ie;
239 int i, len, count, rates_len, supp_rates_len;
240 u16 capab;
241 struct ieee80211_bss *bss;
242 int wmm = 0;
243 struct ieee80211_supported_band *sband;
244 u64 rates = 0;
245
246 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
247 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
248 ifsta->ssid_len);
249 if (!skb) {
250 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
251 "frame\n", sdata->dev->name);
252 return;
253 }
254 skb_reserve(skb, local->hw.extra_tx_headroom);
255
256 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
257
258 capab = ifsta->capab;
259
260 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
261 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
262 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
263 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
264 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
265 }
266
267 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
268 local->hw.conf.channel->center_freq,
269 ifsta->ssid, ifsta->ssid_len);
270 if (bss) {
271 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
272 capab |= WLAN_CAPABILITY_PRIVACY;
273 if (bss->wmm_used)
274 wmm = 1;
275
276 /* get all rates supported by the device and the AP as
277 * some APs don't like getting a superset of their rates
278 * in the association request (e.g. D-Link DAP 1353 in
279 * b-only mode) */
280 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
281
282 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
283 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
284 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
285
286 ieee80211_rx_bss_put(local, bss);
287 } else {
288 rates = ~0;
289 rates_len = sband->n_bitrates;
290 }
291
292 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
293 memset(mgmt, 0, 24);
294 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
295 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
296 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
297
298 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
299 skb_put(skb, 10);
300 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
301 IEEE80211_STYPE_REASSOC_REQ);
302 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
303 mgmt->u.reassoc_req.listen_interval =
304 cpu_to_le16(local->hw.conf.listen_interval);
305 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
306 ETH_ALEN);
307 } else {
308 skb_put(skb, 4);
309 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
310 IEEE80211_STYPE_ASSOC_REQ);
311 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
312 mgmt->u.assoc_req.listen_interval =
313 cpu_to_le16(local->hw.conf.listen_interval);
314 }
315
316 /* SSID */
317 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
318 *pos++ = WLAN_EID_SSID;
319 *pos++ = ifsta->ssid_len;
320 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
321
322 /* add all rates which were marked to be used above */
323 supp_rates_len = rates_len;
324 if (supp_rates_len > 8)
325 supp_rates_len = 8;
326
327 len = sband->n_bitrates;
328 pos = skb_put(skb, supp_rates_len + 2);
329 *pos++ = WLAN_EID_SUPP_RATES;
330 *pos++ = supp_rates_len;
331
332 count = 0;
333 for (i = 0; i < sband->n_bitrates; i++) {
334 if (BIT(i) & rates) {
335 int rate = sband->bitrates[i].bitrate;
336 *pos++ = (u8) (rate / 5);
337 if (++count == 8)
338 break;
339 }
340 }
341
342 if (rates_len > count) {
343 pos = skb_put(skb, rates_len - count + 2);
344 *pos++ = WLAN_EID_EXT_SUPP_RATES;
345 *pos++ = rates_len - count;
346
347 for (i++; i < sband->n_bitrates; i++) {
348 if (BIT(i) & rates) {
349 int rate = sband->bitrates[i].bitrate;
350 *pos++ = (u8) (rate / 5);
351 }
352 }
353 }
354
355 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
356 /* 1. power capabilities */
357 pos = skb_put(skb, 4);
358 *pos++ = WLAN_EID_PWR_CAPABILITY;
359 *pos++ = 2;
360 *pos++ = 0; /* min tx power */
361 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
362
363 /* 2. supported channels */
364 /* TODO: get this in reg domain format */
365 pos = skb_put(skb, 2 * sband->n_channels + 2);
366 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
367 *pos++ = 2 * sband->n_channels;
368 for (i = 0; i < sband->n_channels; i++) {
369 *pos++ = ieee80211_frequency_to_channel(
370 sband->channels[i].center_freq);
371 *pos++ = 1; /* one channel in the subband*/
372 }
373 }
374
375 if (ifsta->extra_ie) {
376 pos = skb_put(skb, ifsta->extra_ie_len);
377 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
378 }
379
380 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
381 pos = skb_put(skb, 9);
382 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
383 *pos++ = 7; /* len */
384 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
385 *pos++ = 0x50;
386 *pos++ = 0xf2;
387 *pos++ = 2; /* WME */
388 *pos++ = 0; /* WME info */
389 *pos++ = 1; /* WME ver */
390 *pos++ = 0;
391 }
392
393 /* wmm support is a must to HT */
394 /*
395 * IEEE802.11n does not allow TKIP/WEP as pairwise
396 * ciphers in HT mode. We still associate in non-ht
397 * mode (11a/b/g) if any one of these ciphers is
398 * configured as pairwise.
399 */
400 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
401 sband->ht_cap.ht_supported &&
402 (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
403 ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
404 (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
405 struct ieee80211_ht_info *ht_info =
406 (struct ieee80211_ht_info *)(ht_ie + 2);
407 u16 cap = sband->ht_cap.cap;
408 __le16 tmp;
409 u32 flags = local->hw.conf.channel->flags;
410
411 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
412 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
413 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
414 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
415 cap &= ~IEEE80211_HT_CAP_SGI_40;
416 }
417 break;
418 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
419 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
420 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
421 cap &= ~IEEE80211_HT_CAP_SGI_40;
422 }
423 break;
424 }
425
426 tmp = cpu_to_le16(cap);
427 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
428 *pos++ = WLAN_EID_HT_CAPABILITY;
429 *pos++ = sizeof(struct ieee80211_ht_cap);
430 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
431 memcpy(pos, &tmp, sizeof(u16));
432 pos += sizeof(u16);
433 /* TODO: needs a define here for << 2 */
434 *pos++ = sband->ht_cap.ampdu_factor |
435 (sband->ht_cap.ampdu_density << 2);
436 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
437 }
438
439 kfree(ifsta->assocreq_ies);
440 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
441 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
442 if (ifsta->assocreq_ies)
443 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
444
445 ieee80211_tx_skb(sdata, skb, 0);
446 }
447
448
449 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
450 u16 stype, u16 reason)
451 {
452 struct ieee80211_local *local = sdata->local;
453 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
454 struct sk_buff *skb;
455 struct ieee80211_mgmt *mgmt;
456
457 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
458 if (!skb) {
459 printk(KERN_DEBUG "%s: failed to allocate buffer for "
460 "deauth/disassoc frame\n", sdata->dev->name);
461 return;
462 }
463 skb_reserve(skb, local->hw.extra_tx_headroom);
464
465 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
466 memset(mgmt, 0, 24);
467 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
468 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
469 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
470 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
471 skb_put(skb, 2);
472 /* u.deauth.reason_code == u.disassoc.reason_code */
473 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
474
475 ieee80211_tx_skb(sdata, skb, ifsta->flags & IEEE80211_STA_MFP_ENABLED);
476 }
477
478 /* MLME */
479 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
480 struct ieee80211_bss *bss)
481 {
482 struct ieee80211_local *local = sdata->local;
483 int i, have_higher_than_11mbit = 0;
484
485 /* cf. IEEE 802.11 9.2.12 */
486 for (i = 0; i < bss->supp_rates_len; i++)
487 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
488 have_higher_than_11mbit = 1;
489
490 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
491 have_higher_than_11mbit)
492 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
493 else
494 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
495
496 ieee80211_set_wmm_default(sdata);
497 }
498
499 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
500 struct ieee80211_if_sta *ifsta,
501 u8 *wmm_param, size_t wmm_param_len)
502 {
503 struct ieee80211_tx_queue_params params;
504 size_t left;
505 int count;
506 u8 *pos;
507
508 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
509 return;
510
511 if (!wmm_param)
512 return;
513
514 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
515 return;
516 count = wmm_param[6] & 0x0f;
517 if (count == ifsta->wmm_last_param_set)
518 return;
519 ifsta->wmm_last_param_set = count;
520
521 pos = wmm_param + 8;
522 left = wmm_param_len - 8;
523
524 memset(&params, 0, sizeof(params));
525
526 if (!local->ops->conf_tx)
527 return;
528
529 local->wmm_acm = 0;
530 for (; left >= 4; left -= 4, pos += 4) {
531 int aci = (pos[0] >> 5) & 0x03;
532 int acm = (pos[0] >> 4) & 0x01;
533 int queue;
534
535 switch (aci) {
536 case 1:
537 queue = 3;
538 if (acm)
539 local->wmm_acm |= BIT(0) | BIT(3);
540 break;
541 case 2:
542 queue = 1;
543 if (acm)
544 local->wmm_acm |= BIT(4) | BIT(5);
545 break;
546 case 3:
547 queue = 0;
548 if (acm)
549 local->wmm_acm |= BIT(6) | BIT(7);
550 break;
551 case 0:
552 default:
553 queue = 2;
554 if (acm)
555 local->wmm_acm |= BIT(1) | BIT(2);
556 break;
557 }
558
559 params.aifs = pos[0] & 0x0f;
560 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
561 params.cw_min = ecw2cw(pos[1] & 0x0f);
562 params.txop = get_unaligned_le16(pos + 2);
563 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
564 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
565 "cWmin=%d cWmax=%d txop=%d\n",
566 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
567 params.cw_max, params.txop);
568 #endif
569 /* TODO: handle ACM (block TX, fallback to next lowest allowed
570 * AC for now) */
571 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
572 printk(KERN_DEBUG "%s: failed to set TX queue "
573 "parameters for queue %d\n", local->mdev->name, queue);
574 }
575 }
576 }
577
578 static bool check_tim(struct ieee802_11_elems *elems, u16 aid, bool *is_mc)
579 {
580 u8 mask;
581 u8 index, indexn1, indexn2;
582 struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
583
584 aid &= 0x3fff;
585 index = aid / 8;
586 mask = 1 << (aid & 7);
587
588 if (tim->bitmap_ctrl & 0x01)
589 *is_mc = true;
590
591 indexn1 = tim->bitmap_ctrl & 0xfe;
592 indexn2 = elems->tim_len + indexn1 - 4;
593
594 if (index < indexn1 || index > indexn2)
595 return false;
596
597 index -= indexn1;
598
599 return !!(tim->virtual_map[index] & mask);
600 }
601
602 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
603 u16 capab, bool erp_valid, u8 erp)
604 {
605 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
606 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
607 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
608 #endif
609 u32 changed = 0;
610 bool use_protection;
611 bool use_short_preamble;
612 bool use_short_slot;
613
614 if (erp_valid) {
615 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
616 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
617 } else {
618 use_protection = false;
619 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
620 }
621
622 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
623
624 if (use_protection != bss_conf->use_cts_prot) {
625 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
626 if (net_ratelimit()) {
627 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
628 sdata->dev->name,
629 use_protection ? "enabled" : "disabled",
630 ifsta->bssid);
631 }
632 #endif
633 bss_conf->use_cts_prot = use_protection;
634 changed |= BSS_CHANGED_ERP_CTS_PROT;
635 }
636
637 if (use_short_preamble != bss_conf->use_short_preamble) {
638 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
639 if (net_ratelimit()) {
640 printk(KERN_DEBUG "%s: switched to %s barker preamble"
641 " (BSSID=%pM)\n",
642 sdata->dev->name,
643 use_short_preamble ? "short" : "long",
644 ifsta->bssid);
645 }
646 #endif
647 bss_conf->use_short_preamble = use_short_preamble;
648 changed |= BSS_CHANGED_ERP_PREAMBLE;
649 }
650
651 if (use_short_slot != bss_conf->use_short_slot) {
652 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
653 if (net_ratelimit()) {
654 printk(KERN_DEBUG "%s: switched to %s slot time"
655 " (BSSID=%pM)\n",
656 sdata->dev->name,
657 use_short_slot ? "short" : "long",
658 ifsta->bssid);
659 }
660 #endif
661 bss_conf->use_short_slot = use_short_slot;
662 changed |= BSS_CHANGED_ERP_SLOT;
663 }
664
665 return changed;
666 }
667
668 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
669 struct ieee80211_if_sta *ifsta)
670 {
671 union iwreq_data wrqu;
672 memset(&wrqu, 0, sizeof(wrqu));
673 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
674 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
675 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
676 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
677 }
678
679 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
680 struct ieee80211_if_sta *ifsta)
681 {
682 char *buf;
683 size_t len;
684 int i;
685 union iwreq_data wrqu;
686
687 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
688 return;
689
690 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
691 ifsta->assocresp_ies_len), GFP_KERNEL);
692 if (!buf)
693 return;
694
695 len = sprintf(buf, "ASSOCINFO(");
696 if (ifsta->assocreq_ies) {
697 len += sprintf(buf + len, "ReqIEs=");
698 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
699 len += sprintf(buf + len, "%02x",
700 ifsta->assocreq_ies[i]);
701 }
702 }
703 if (ifsta->assocresp_ies) {
704 if (ifsta->assocreq_ies)
705 len += sprintf(buf + len, " ");
706 len += sprintf(buf + len, "RespIEs=");
707 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
708 len += sprintf(buf + len, "%02x",
709 ifsta->assocresp_ies[i]);
710 }
711 }
712 len += sprintf(buf + len, ")");
713
714 if (len > IW_CUSTOM_MAX) {
715 len = sprintf(buf, "ASSOCRESPIE=");
716 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
717 len += sprintf(buf + len, "%02x",
718 ifsta->assocresp_ies[i]);
719 }
720 }
721
722 if (len <= IW_CUSTOM_MAX) {
723 memset(&wrqu, 0, sizeof(wrqu));
724 wrqu.data.length = len;
725 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
726 }
727
728 kfree(buf);
729 }
730
731
732 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
733 struct ieee80211_if_sta *ifsta,
734 u32 bss_info_changed)
735 {
736 struct ieee80211_local *local = sdata->local;
737 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
738
739 struct ieee80211_bss *bss;
740
741 bss_info_changed |= BSS_CHANGED_ASSOC;
742 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
743
744 if (sdata->vif.type != NL80211_IFTYPE_STATION)
745 return;
746
747 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
748 conf->channel->center_freq,
749 ifsta->ssid, ifsta->ssid_len);
750 if (bss) {
751 /* set timing information */
752 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
753 sdata->vif.bss_conf.timestamp = bss->timestamp;
754 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
755
756 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
757 bss->capability, bss->has_erp_value, bss->erp_value);
758
759 ieee80211_rx_bss_put(local, bss);
760 }
761
762 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
763 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
764 ieee80211_sta_send_associnfo(sdata, ifsta);
765
766 ifsta->last_probe = jiffies;
767 ieee80211_led_assoc(local, 1);
768
769 sdata->vif.bss_conf.assoc = 1;
770 /*
771 * For now just always ask the driver to update the basic rateset
772 * when we have associated, we aren't checking whether it actually
773 * changed or not.
774 */
775 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
776 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
777
778 if (local->powersave) {
779 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
780 local->hw.conf.dynamic_ps_timeout > 0) {
781 mod_timer(&local->dynamic_ps_timer, jiffies +
782 msecs_to_jiffies(
783 local->hw.conf.dynamic_ps_timeout));
784 } else {
785 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
786 ieee80211_send_nullfunc(local, sdata, 1);
787 conf->flags |= IEEE80211_CONF_PS;
788 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
789 }
790 }
791
792 netif_tx_start_all_queues(sdata->dev);
793 netif_carrier_on(sdata->dev);
794
795 ieee80211_sta_send_apinfo(sdata, ifsta);
796 }
797
798 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
799 struct ieee80211_if_sta *ifsta)
800 {
801 ifsta->direct_probe_tries++;
802 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
803 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
804 sdata->dev->name, ifsta->bssid);
805 ifsta->state = IEEE80211_STA_MLME_DISABLED;
806 ieee80211_sta_send_apinfo(sdata, ifsta);
807 return;
808 }
809
810 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
811 sdata->dev->name, ifsta->bssid,
812 ifsta->direct_probe_tries);
813
814 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
815
816 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
817
818 /* Direct probe is sent to broadcast address as some APs
819 * will not answer to direct packet in unassociated state.
820 */
821 ieee80211_send_probe_req(sdata, NULL,
822 ifsta->ssid, ifsta->ssid_len);
823
824 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
825 }
826
827
828 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
829 struct ieee80211_if_sta *ifsta)
830 {
831 ifsta->auth_tries++;
832 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
833 printk(KERN_DEBUG "%s: authentication with AP %pM"
834 " timed out\n",
835 sdata->dev->name, ifsta->bssid);
836 ifsta->state = IEEE80211_STA_MLME_DISABLED;
837 ieee80211_sta_send_apinfo(sdata, ifsta);
838 return;
839 }
840
841 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
842 printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
843 sdata->dev->name, ifsta->bssid);
844
845 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
846
847 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
848 }
849
850 /*
851 * The disassoc 'reason' argument can be either our own reason
852 * if self disconnected or a reason code from the AP.
853 */
854 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
855 struct ieee80211_if_sta *ifsta, bool deauth,
856 bool self_disconnected, u16 reason)
857 {
858 struct ieee80211_local *local = sdata->local;
859 struct sta_info *sta;
860 u32 changed = 0, config_changed = 0;
861
862 rcu_read_lock();
863
864 sta = sta_info_get(local, ifsta->bssid);
865 if (!sta) {
866 rcu_read_unlock();
867 return;
868 }
869
870 if (deauth) {
871 ifsta->direct_probe_tries = 0;
872 ifsta->auth_tries = 0;
873 }
874 ifsta->assoc_scan_tries = 0;
875 ifsta->assoc_tries = 0;
876
877 netif_tx_stop_all_queues(sdata->dev);
878 netif_carrier_off(sdata->dev);
879
880 ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
881
882 if (self_disconnected) {
883 if (deauth)
884 ieee80211_send_deauth_disassoc(sdata,
885 IEEE80211_STYPE_DEAUTH, reason);
886 else
887 ieee80211_send_deauth_disassoc(sdata,
888 IEEE80211_STYPE_DISASSOC, reason);
889 }
890
891 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
892 changed |= ieee80211_reset_erp_info(sdata);
893
894 ieee80211_led_assoc(local, 0);
895 changed |= BSS_CHANGED_ASSOC;
896 sdata->vif.bss_conf.assoc = false;
897
898 ieee80211_sta_send_apinfo(sdata, ifsta);
899
900 if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
901 ifsta->state = IEEE80211_STA_MLME_DISABLED;
902
903 rcu_read_unlock();
904
905 /* channel(_type) changes are handled by ieee80211_hw_config */
906 local->oper_channel_type = NL80211_CHAN_NO_HT;
907
908 local->power_constr_level = 0;
909
910 del_timer_sync(&local->dynamic_ps_timer);
911 cancel_work_sync(&local->dynamic_ps_enable_work);
912
913 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
914 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
915 config_changed |= IEEE80211_CONF_CHANGE_PS;
916 }
917
918 ieee80211_hw_config(local, config_changed);
919 ieee80211_bss_info_change_notify(sdata, changed);
920
921 rcu_read_lock();
922
923 sta = sta_info_get(local, ifsta->bssid);
924 if (!sta) {
925 rcu_read_unlock();
926 return;
927 }
928
929 sta_info_unlink(&sta);
930
931 rcu_read_unlock();
932
933 sta_info_destroy(sta);
934 }
935
936 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
937 {
938 if (!sdata || !sdata->default_key ||
939 sdata->default_key->conf.alg != ALG_WEP)
940 return 0;
941 return 1;
942 }
943
944 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
945 struct ieee80211_if_sta *ifsta)
946 {
947 struct ieee80211_local *local = sdata->local;
948 struct ieee80211_bss *bss;
949 int bss_privacy;
950 int wep_privacy;
951 int privacy_invoked;
952
953 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
954 return 0;
955
956 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
957 local->hw.conf.channel->center_freq,
958 ifsta->ssid, ifsta->ssid_len);
959 if (!bss)
960 return 0;
961
962 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
963 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
964 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
965
966 ieee80211_rx_bss_put(local, bss);
967
968 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
969 return 0;
970
971 return 1;
972 }
973
974 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
975 struct ieee80211_if_sta *ifsta)
976 {
977 ifsta->assoc_tries++;
978 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
979 printk(KERN_DEBUG "%s: association with AP %pM"
980 " timed out\n",
981 sdata->dev->name, ifsta->bssid);
982 ifsta->state = IEEE80211_STA_MLME_DISABLED;
983 ieee80211_sta_send_apinfo(sdata, ifsta);
984 return;
985 }
986
987 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
988 printk(KERN_DEBUG "%s: associate with AP %pM\n",
989 sdata->dev->name, ifsta->bssid);
990 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
991 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
992 "mixed-cell disabled - abort association\n", sdata->dev->name);
993 ifsta->state = IEEE80211_STA_MLME_DISABLED;
994 return;
995 }
996
997 ieee80211_send_assoc(sdata, ifsta);
998
999 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1000 }
1001
1002
1003 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1004 struct ieee80211_if_sta *ifsta)
1005 {
1006 struct ieee80211_local *local = sdata->local;
1007 struct sta_info *sta;
1008 int disassoc;
1009
1010 /* TODO: start monitoring current AP signal quality and number of
1011 * missed beacons. Scan other channels every now and then and search
1012 * for better APs. */
1013 /* TODO: remove expired BSSes */
1014
1015 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1016
1017 rcu_read_lock();
1018
1019 sta = sta_info_get(local, ifsta->bssid);
1020 if (!sta) {
1021 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1022 sdata->dev->name, ifsta->bssid);
1023 disassoc = 1;
1024 } else {
1025 disassoc = 0;
1026 if (time_after(jiffies,
1027 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1028 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1029 printk(KERN_DEBUG "%s: No ProbeResp from "
1030 "current AP %pM - assume out of "
1031 "range\n",
1032 sdata->dev->name, ifsta->bssid);
1033 disassoc = 1;
1034 } else
1035 ieee80211_send_probe_req(sdata, ifsta->bssid,
1036 ifsta->ssid,
1037 ifsta->ssid_len);
1038 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1039 } else {
1040 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1041 if (time_after(jiffies, ifsta->last_probe +
1042 IEEE80211_PROBE_INTERVAL)) {
1043 ifsta->last_probe = jiffies;
1044 ieee80211_send_probe_req(sdata, ifsta->bssid,
1045 ifsta->ssid,
1046 ifsta->ssid_len);
1047 }
1048 }
1049 }
1050
1051 rcu_read_unlock();
1052
1053 if (disassoc)
1054 ieee80211_set_disassoc(sdata, ifsta, true, true,
1055 WLAN_REASON_PREV_AUTH_NOT_VALID);
1056 else
1057 mod_timer(&ifsta->timer, jiffies +
1058 IEEE80211_MONITORING_INTERVAL);
1059 }
1060
1061
1062 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1063 struct ieee80211_if_sta *ifsta)
1064 {
1065 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1066 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1067 ieee80211_associate(sdata, ifsta);
1068 }
1069
1070
1071 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1072 struct ieee80211_if_sta *ifsta,
1073 struct ieee80211_mgmt *mgmt,
1074 size_t len)
1075 {
1076 u8 *pos;
1077 struct ieee802_11_elems elems;
1078
1079 pos = mgmt->u.auth.variable;
1080 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1081 if (!elems.challenge)
1082 return;
1083 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1084 elems.challenge_len + 2, 1);
1085 }
1086
1087 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1088 struct ieee80211_if_sta *ifsta,
1089 struct ieee80211_mgmt *mgmt,
1090 size_t len)
1091 {
1092 u16 auth_alg, auth_transaction, status_code;
1093
1094 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1095 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1096 return;
1097
1098 if (len < 24 + 6)
1099 return;
1100
1101 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1102 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1103 return;
1104
1105 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1106 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1107 return;
1108
1109 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1110 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1111 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1112
1113 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1114 /*
1115 * IEEE 802.11 standard does not require authentication in IBSS
1116 * networks and most implementations do not seem to use it.
1117 * However, try to reply to authentication attempts if someone
1118 * has actually implemented this.
1119 */
1120 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1121 return;
1122 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1123 }
1124
1125 if (auth_alg != ifsta->auth_alg ||
1126 auth_transaction != ifsta->auth_transaction)
1127 return;
1128
1129 if (status_code != WLAN_STATUS_SUCCESS) {
1130 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1131 u8 algs[3];
1132 const int num_algs = ARRAY_SIZE(algs);
1133 int i, pos;
1134 algs[0] = algs[1] = algs[2] = 0xff;
1135 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1136 algs[0] = WLAN_AUTH_OPEN;
1137 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1138 algs[1] = WLAN_AUTH_SHARED_KEY;
1139 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1140 algs[2] = WLAN_AUTH_LEAP;
1141 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1142 pos = 0;
1143 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1144 pos = 1;
1145 else
1146 pos = 2;
1147 for (i = 0; i < num_algs; i++) {
1148 pos++;
1149 if (pos >= num_algs)
1150 pos = 0;
1151 if (algs[pos] == ifsta->auth_alg ||
1152 algs[pos] == 0xff)
1153 continue;
1154 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1155 !ieee80211_sta_wep_configured(sdata))
1156 continue;
1157 ifsta->auth_alg = algs[pos];
1158 break;
1159 }
1160 }
1161 return;
1162 }
1163
1164 switch (ifsta->auth_alg) {
1165 case WLAN_AUTH_OPEN:
1166 case WLAN_AUTH_LEAP:
1167 ieee80211_auth_completed(sdata, ifsta);
1168 break;
1169 case WLAN_AUTH_SHARED_KEY:
1170 if (ifsta->auth_transaction == 4)
1171 ieee80211_auth_completed(sdata, ifsta);
1172 else
1173 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1174 break;
1175 }
1176 }
1177
1178
1179 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1180 struct ieee80211_if_sta *ifsta,
1181 struct ieee80211_mgmt *mgmt,
1182 size_t len)
1183 {
1184 u16 reason_code;
1185
1186 if (len < 24 + 2)
1187 return;
1188
1189 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1190 return;
1191
1192 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1193
1194 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1195 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1196 sdata->dev->name, reason_code);
1197
1198 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1199 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1200 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1201 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1202 mod_timer(&ifsta->timer, jiffies +
1203 IEEE80211_RETRY_AUTH_INTERVAL);
1204 }
1205
1206 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1207 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1208 }
1209
1210
1211 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1212 struct ieee80211_if_sta *ifsta,
1213 struct ieee80211_mgmt *mgmt,
1214 size_t len)
1215 {
1216 u16 reason_code;
1217
1218 if (len < 24 + 2)
1219 return;
1220
1221 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1222 return;
1223
1224 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1225
1226 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1227 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1228 sdata->dev->name, reason_code);
1229
1230 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1231 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1232 mod_timer(&ifsta->timer, jiffies +
1233 IEEE80211_RETRY_AUTH_INTERVAL);
1234 }
1235
1236 ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1237 }
1238
1239
1240 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1241 struct ieee80211_if_sta *ifsta,
1242 struct ieee80211_mgmt *mgmt,
1243 size_t len,
1244 int reassoc)
1245 {
1246 struct ieee80211_local *local = sdata->local;
1247 struct ieee80211_supported_band *sband;
1248 struct sta_info *sta;
1249 u64 rates, basic_rates;
1250 u16 capab_info, status_code, aid;
1251 struct ieee802_11_elems elems;
1252 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1253 u8 *pos;
1254 u32 changed = 0;
1255 int i, j;
1256 bool have_higher_than_11mbit = false, newsta = false;
1257 u16 ap_ht_cap_flags;
1258
1259 /* AssocResp and ReassocResp have identical structure, so process both
1260 * of them in this function. */
1261
1262 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1263 return;
1264
1265 if (len < 24 + 6)
1266 return;
1267
1268 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1269 return;
1270
1271 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1272 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1273 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1274
1275 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1276 "status=%d aid=%d)\n",
1277 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1278 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1279
1280 pos = mgmt->u.assoc_resp.variable;
1281 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1282
1283 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1284 elems.assoc_comeback && elems.assoc_comeback_len == 4) {
1285 u32 tu, ms;
1286 tu = get_unaligned_le32(elems.assoc_comeback);
1287 ms = tu * 1024 / 1000;
1288 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1289 "comeback duration %u TU (%u ms)\n",
1290 sdata->dev->name, tu, ms);
1291 if (ms > IEEE80211_ASSOC_TIMEOUT)
1292 mod_timer(&ifsta->timer,
1293 jiffies + msecs_to_jiffies(ms));
1294 return;
1295 }
1296
1297 if (status_code != WLAN_STATUS_SUCCESS) {
1298 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1299 sdata->dev->name, status_code);
1300 /* if this was a reassociation, ensure we try a "full"
1301 * association next time. This works around some broken APs
1302 * which do not correctly reject reassociation requests. */
1303 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1304 return;
1305 }
1306
1307 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1308 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1309 "set\n", sdata->dev->name, aid);
1310 aid &= ~(BIT(15) | BIT(14));
1311
1312 if (!elems.supp_rates) {
1313 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1314 sdata->dev->name);
1315 return;
1316 }
1317
1318 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1319 ifsta->aid = aid;
1320 ifsta->ap_capab = capab_info;
1321
1322 kfree(ifsta->assocresp_ies);
1323 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1324 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1325 if (ifsta->assocresp_ies)
1326 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1327
1328 rcu_read_lock();
1329
1330 /* Add STA entry for the AP */
1331 sta = sta_info_get(local, ifsta->bssid);
1332 if (!sta) {
1333 struct ieee80211_bss *bss;
1334
1335 newsta = true;
1336
1337 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1338 if (!sta) {
1339 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1340 " the AP\n", sdata->dev->name);
1341 rcu_read_unlock();
1342 return;
1343 }
1344 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1345 local->hw.conf.channel->center_freq,
1346 ifsta->ssid, ifsta->ssid_len);
1347 if (bss) {
1348 sta->last_signal = bss->signal;
1349 sta->last_qual = bss->qual;
1350 sta->last_noise = bss->noise;
1351 ieee80211_rx_bss_put(local, bss);
1352 }
1353
1354 /* update new sta with its last rx activity */
1355 sta->last_rx = jiffies;
1356 }
1357
1358 /*
1359 * FIXME: Do we really need to update the sta_info's information here?
1360 * We already know about the AP (we found it in our list) so it
1361 * should already be filled with the right info, no?
1362 * As is stands, all this is racy because typically we assume
1363 * the information that is filled in here (except flags) doesn't
1364 * change while a STA structure is alive. As such, it should move
1365 * to between the sta_info_alloc() and sta_info_insert() above.
1366 */
1367
1368 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1369 WLAN_STA_AUTHORIZED);
1370
1371 rates = 0;
1372 basic_rates = 0;
1373 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1374
1375 for (i = 0; i < elems.supp_rates_len; i++) {
1376 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1377 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1378
1379 if (rate > 110)
1380 have_higher_than_11mbit = true;
1381
1382 for (j = 0; j < sband->n_bitrates; j++) {
1383 if (sband->bitrates[j].bitrate == rate) {
1384 rates |= BIT(j);
1385 if (is_basic)
1386 basic_rates |= BIT(j);
1387 break;
1388 }
1389 }
1390 }
1391
1392 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1393 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1394 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1395
1396 if (rate > 110)
1397 have_higher_than_11mbit = true;
1398
1399 for (j = 0; j < sband->n_bitrates; j++) {
1400 if (sband->bitrates[j].bitrate == rate) {
1401 rates |= BIT(j);
1402 if (is_basic)
1403 basic_rates |= BIT(j);
1404 break;
1405 }
1406 }
1407 }
1408
1409 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1410 sdata->vif.bss_conf.basic_rates = basic_rates;
1411
1412 /* cf. IEEE 802.11 9.2.12 */
1413 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1414 have_higher_than_11mbit)
1415 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1416 else
1417 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1418
1419 if (elems.ht_cap_elem)
1420 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1421 elems.ht_cap_elem, &sta->sta.ht_cap);
1422
1423 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1424
1425 rate_control_rate_init(sta);
1426
1427 if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
1428 set_sta_flags(sta, WLAN_STA_MFP);
1429
1430 if (elems.wmm_param)
1431 set_sta_flags(sta, WLAN_STA_WME);
1432
1433 if (newsta) {
1434 int err = sta_info_insert(sta);
1435 if (err) {
1436 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1437 " the AP (error %d)\n", sdata->dev->name, err);
1438 rcu_read_unlock();
1439 return;
1440 }
1441 }
1442
1443 rcu_read_unlock();
1444
1445 if (elems.wmm_param)
1446 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1447 elems.wmm_param_len);
1448
1449 if (elems.ht_info_elem && elems.wmm_param &&
1450 (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1451 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1452 ap_ht_cap_flags);
1453
1454 /* set AID and assoc capability,
1455 * ieee80211_set_associated() will tell the driver */
1456 bss_conf->aid = aid;
1457 bss_conf->assoc_capability = capab_info;
1458 ieee80211_set_associated(sdata, ifsta, changed);
1459
1460 ieee80211_associated(sdata, ifsta);
1461 }
1462
1463
1464 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1465 struct ieee80211_if_sta *ifsta,
1466 struct ieee80211_bss *bss)
1467 {
1468 struct ieee80211_local *local = sdata->local;
1469 int res, rates, i, j;
1470 struct sk_buff *skb;
1471 struct ieee80211_mgmt *mgmt;
1472 u8 *pos;
1473 struct ieee80211_supported_band *sband;
1474 union iwreq_data wrqu;
1475
1476 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1477 if (!skb) {
1478 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1479 "response\n", sdata->dev->name);
1480 return -ENOMEM;
1481 }
1482
1483 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1484
1485 /* Remove possible STA entries from other IBSS networks. */
1486 sta_info_flush_delayed(sdata);
1487
1488 if (local->ops->reset_tsf) {
1489 /* Reset own TSF to allow time synchronization work. */
1490 local->ops->reset_tsf(local_to_hw(local));
1491 }
1492 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1493 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1494 if (res)
1495 return res;
1496
1497 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1498
1499 sdata->drop_unencrypted = bss->capability &
1500 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1501
1502 res = ieee80211_set_freq(sdata, bss->freq);
1503
1504 if (res)
1505 return res;
1506
1507 /* Build IBSS probe response */
1508
1509 skb_reserve(skb, local->hw.extra_tx_headroom);
1510
1511 mgmt = (struct ieee80211_mgmt *)
1512 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1513 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1514 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1515 IEEE80211_STYPE_PROBE_RESP);
1516 memset(mgmt->da, 0xff, ETH_ALEN);
1517 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1518 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1519 mgmt->u.beacon.beacon_int =
1520 cpu_to_le16(local->hw.conf.beacon_int);
1521 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1522 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1523
1524 pos = skb_put(skb, 2 + ifsta->ssid_len);
1525 *pos++ = WLAN_EID_SSID;
1526 *pos++ = ifsta->ssid_len;
1527 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1528
1529 rates = bss->supp_rates_len;
1530 if (rates > 8)
1531 rates = 8;
1532 pos = skb_put(skb, 2 + rates);
1533 *pos++ = WLAN_EID_SUPP_RATES;
1534 *pos++ = rates;
1535 memcpy(pos, bss->supp_rates, rates);
1536
1537 if (bss->band == IEEE80211_BAND_2GHZ) {
1538 pos = skb_put(skb, 2 + 1);
1539 *pos++ = WLAN_EID_DS_PARAMS;
1540 *pos++ = 1;
1541 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1542 }
1543
1544 pos = skb_put(skb, 2 + 2);
1545 *pos++ = WLAN_EID_IBSS_PARAMS;
1546 *pos++ = 2;
1547 /* FIX: set ATIM window based on scan results */
1548 *pos++ = 0;
1549 *pos++ = 0;
1550
1551 if (bss->supp_rates_len > 8) {
1552 rates = bss->supp_rates_len - 8;
1553 pos = skb_put(skb, 2 + rates);
1554 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1555 *pos++ = rates;
1556 memcpy(pos, &bss->supp_rates[8], rates);
1557 }
1558
1559 ifsta->probe_resp = skb;
1560
1561 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1562
1563
1564 rates = 0;
1565 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1566 for (i = 0; i < bss->supp_rates_len; i++) {
1567 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1568 for (j = 0; j < sband->n_bitrates; j++)
1569 if (sband->bitrates[j].bitrate == bitrate)
1570 rates |= BIT(j);
1571 }
1572 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1573
1574 ieee80211_sta_def_wmm_params(sdata, bss);
1575
1576 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1577 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1578
1579 ieee80211_led_assoc(local, true);
1580
1581 memset(&wrqu, 0, sizeof(wrqu));
1582 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1583 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1584
1585 return res;
1586 }
1587
1588 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1589 struct ieee80211_mgmt *mgmt,
1590 size_t len,
1591 struct ieee80211_rx_status *rx_status,
1592 struct ieee802_11_elems *elems,
1593 bool beacon)
1594 {
1595 struct ieee80211_local *local = sdata->local;
1596 int freq;
1597 struct ieee80211_bss *bss;
1598 struct sta_info *sta;
1599 struct ieee80211_channel *channel;
1600 u64 beacon_timestamp, rx_timestamp;
1601 u64 supp_rates = 0;
1602 enum ieee80211_band band = rx_status->band;
1603
1604 if (elems->ds_params && elems->ds_params_len == 1)
1605 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1606 else
1607 freq = rx_status->freq;
1608
1609 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1610
1611 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1612 return;
1613
1614 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1615 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1616 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1617
1618 rcu_read_lock();
1619
1620 sta = sta_info_get(local, mgmt->sa);
1621 if (sta) {
1622 u64 prev_rates;
1623
1624 prev_rates = sta->sta.supp_rates[band];
1625 /* make sure mandatory rates are always added */
1626 sta->sta.supp_rates[band] = supp_rates |
1627 ieee80211_mandatory_rates(local, band);
1628
1629 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1630 if (sta->sta.supp_rates[band] != prev_rates)
1631 printk(KERN_DEBUG "%s: updated supp_rates set "
1632 "for %pM based on beacon info (0x%llx | "
1633 "0x%llx -> 0x%llx)\n",
1634 sdata->dev->name,
1635 sta->sta.addr,
1636 (unsigned long long) prev_rates,
1637 (unsigned long long) supp_rates,
1638 (unsigned long long) sta->sta.supp_rates[band]);
1639 #endif
1640 } else {
1641 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1642 }
1643
1644 rcu_read_unlock();
1645 }
1646
1647 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1648 freq, beacon);
1649 if (!bss)
1650 return;
1651
1652 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1653 (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1654 struct ieee80211_channel_sw_ie *sw_elem =
1655 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1656 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1657 }
1658
1659 /* was just updated in ieee80211_bss_info_update */
1660 beacon_timestamp = bss->timestamp;
1661
1662 /*
1663 * In STA mode, the remaining parameters should not be overridden
1664 * by beacons because they're not necessarily accurate there.
1665 */
1666 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1667 bss->last_probe_resp && beacon) {
1668 ieee80211_rx_bss_put(local, bss);
1669 return;
1670 }
1671
1672 /* check if we need to merge IBSS */
1673 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1674 (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1675 bss->capability & WLAN_CAPABILITY_IBSS &&
1676 bss->freq == local->oper_channel->center_freq &&
1677 elems->ssid_len == sdata->u.sta.ssid_len &&
1678 memcmp(elems->ssid, sdata->u.sta.ssid,
1679 sdata->u.sta.ssid_len) == 0) {
1680 if (rx_status->flag & RX_FLAG_TSFT) {
1681 /* in order for correct IBSS merging we need mactime
1682 *
1683 * since mactime is defined as the time the first data
1684 * symbol of the frame hits the PHY, and the timestamp
1685 * of the beacon is defined as "the time that the data
1686 * symbol containing the first bit of the timestamp is
1687 * transmitted to the PHY plus the transmitting STA’s
1688 * delays through its local PHY from the MAC-PHY
1689 * interface to its interface with the WM"
1690 * (802.11 11.1.2) - equals the time this bit arrives at
1691 * the receiver - we have to take into account the
1692 * offset between the two.
1693 * e.g: at 1 MBit that means mactime is 192 usec earlier
1694 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1695 */
1696 int rate;
1697 if (rx_status->flag & RX_FLAG_HT) {
1698 rate = 65; /* TODO: HT rates */
1699 } else {
1700 rate = local->hw.wiphy->bands[band]->
1701 bitrates[rx_status->rate_idx].bitrate;
1702 }
1703 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1704 } else if (local && local->ops && local->ops->get_tsf)
1705 /* second best option: get current TSF */
1706 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1707 else
1708 /* can't merge without knowing the TSF */
1709 rx_timestamp = -1LLU;
1710 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1711 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1712 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1713 mgmt->sa, mgmt->bssid,
1714 (unsigned long long)rx_timestamp,
1715 (unsigned long long)beacon_timestamp,
1716 (unsigned long long)(rx_timestamp - beacon_timestamp),
1717 jiffies);
1718 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1719 if (beacon_timestamp > rx_timestamp) {
1720 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1721 printk(KERN_DEBUG "%s: beacon TSF higher than "
1722 "local TSF - IBSS merge with BSSID %pM\n",
1723 sdata->dev->name, mgmt->bssid);
1724 #endif
1725 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1726 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1727 }
1728 }
1729
1730 ieee80211_rx_bss_put(local, bss);
1731 }
1732
1733
1734 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1735 struct ieee80211_mgmt *mgmt,
1736 size_t len,
1737 struct ieee80211_rx_status *rx_status)
1738 {
1739 size_t baselen;
1740 struct ieee802_11_elems elems;
1741 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1742
1743 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1744 return; /* ignore ProbeResp to foreign address */
1745
1746 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1747 if (baselen > len)
1748 return;
1749
1750 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1751 &elems);
1752
1753 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1754
1755 /* direct probe may be part of the association flow */
1756 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1757 &ifsta->request)) {
1758 printk(KERN_DEBUG "%s direct probe responded\n",
1759 sdata->dev->name);
1760 ieee80211_authenticate(sdata, ifsta);
1761 }
1762 }
1763
1764
1765 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1766 struct ieee80211_mgmt *mgmt,
1767 size_t len,
1768 struct ieee80211_rx_status *rx_status)
1769 {
1770 struct ieee80211_if_sta *ifsta;
1771 size_t baselen;
1772 struct ieee802_11_elems elems;
1773 struct ieee80211_local *local = sdata->local;
1774 u32 changed = 0;
1775 bool erp_valid, directed_tim, is_mc = false;
1776 u8 erp_value = 0;
1777
1778 /* Process beacon from the current BSS */
1779 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1780 if (baselen > len)
1781 return;
1782
1783 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1784
1785 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1786
1787 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1788 return;
1789 ifsta = &sdata->u.sta;
1790
1791 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1792 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1793 return;
1794
1795 if (rx_status->freq != local->hw.conf.channel->center_freq)
1796 return;
1797
1798 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1799 elems.wmm_param_len);
1800
1801 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1802 local->hw.conf.flags & IEEE80211_CONF_PS) {
1803 directed_tim = check_tim(&elems, ifsta->aid, &is_mc);
1804
1805 if (directed_tim || is_mc) {
1806 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1807 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1808 ieee80211_send_nullfunc(local, sdata, 0);
1809 }
1810 }
1811
1812 if (elems.erp_info && elems.erp_info_len >= 1) {
1813 erp_valid = true;
1814 erp_value = elems.erp_info[0];
1815 } else {
1816 erp_valid = false;
1817 }
1818 changed |= ieee80211_handle_bss_capability(sdata,
1819 le16_to_cpu(mgmt->u.beacon.capab_info),
1820 erp_valid, erp_value);
1821
1822
1823 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1824 struct sta_info *sta;
1825 struct ieee80211_supported_band *sband;
1826 u16 ap_ht_cap_flags;
1827
1828 rcu_read_lock();
1829
1830 sta = sta_info_get(local, ifsta->bssid);
1831 if (!sta) {
1832 rcu_read_unlock();
1833 return;
1834 }
1835
1836 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1837
1838 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1839 elems.ht_cap_elem, &sta->sta.ht_cap);
1840
1841 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1842
1843 rcu_read_unlock();
1844
1845 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1846 ap_ht_cap_flags);
1847 }
1848
1849 if (elems.country_elem) {
1850 /* Note we are only reviewing this on beacons
1851 * for the BSSID we are associated to */
1852 regulatory_hint_11d(local->hw.wiphy,
1853 elems.country_elem, elems.country_elem_len);
1854
1855 /* TODO: IBSS also needs this */
1856 if (elems.pwr_constr_elem)
1857 ieee80211_handle_pwr_constr(sdata,
1858 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1859 elems.pwr_constr_elem,
1860 elems.pwr_constr_elem_len);
1861 }
1862
1863 ieee80211_bss_info_change_notify(sdata, changed);
1864 }
1865
1866
1867 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1868 struct ieee80211_if_sta *ifsta,
1869 struct ieee80211_mgmt *mgmt,
1870 size_t len)
1871 {
1872 struct ieee80211_local *local = sdata->local;
1873 int tx_last_beacon;
1874 struct sk_buff *skb;
1875 struct ieee80211_mgmt *resp;
1876 u8 *pos, *end;
1877
1878 if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1879 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1880 len < 24 + 2 || !ifsta->probe_resp)
1881 return;
1882
1883 if (local->ops->tx_last_beacon)
1884 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1885 else
1886 tx_last_beacon = 1;
1887
1888 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1889 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1890 " (tx_last_beacon=%d)\n",
1891 sdata->dev->name, mgmt->sa, mgmt->da,
1892 mgmt->bssid, tx_last_beacon);
1893 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1894
1895 if (!tx_last_beacon)
1896 return;
1897
1898 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1899 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1900 return;
1901
1902 end = ((u8 *) mgmt) + len;
1903 pos = mgmt->u.probe_req.variable;
1904 if (pos[0] != WLAN_EID_SSID ||
1905 pos + 2 + pos[1] > end) {
1906 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1907 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1908 "from %pM\n",
1909 sdata->dev->name, mgmt->sa);
1910 #endif
1911 return;
1912 }
1913 if (pos[1] != 0 &&
1914 (pos[1] != ifsta->ssid_len ||
1915 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1916 /* Ignore ProbeReq for foreign SSID */
1917 return;
1918 }
1919
1920 /* Reply with ProbeResp */
1921 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1922 if (!skb)
1923 return;
1924
1925 resp = (struct ieee80211_mgmt *) skb->data;
1926 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1927 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1928 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1929 sdata->dev->name, resp->da);
1930 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1931 ieee80211_tx_skb(sdata, skb, 0);
1932 }
1933
1934 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1935 struct ieee80211_rx_status *rx_status)
1936 {
1937 struct ieee80211_local *local = sdata->local;
1938 struct ieee80211_if_sta *ifsta;
1939 struct ieee80211_mgmt *mgmt;
1940 u16 fc;
1941
1942 if (skb->len < 24)
1943 goto fail;
1944
1945 ifsta = &sdata->u.sta;
1946
1947 mgmt = (struct ieee80211_mgmt *) skb->data;
1948 fc = le16_to_cpu(mgmt->frame_control);
1949
1950 switch (fc & IEEE80211_FCTL_STYPE) {
1951 case IEEE80211_STYPE_PROBE_REQ:
1952 case IEEE80211_STYPE_PROBE_RESP:
1953 case IEEE80211_STYPE_BEACON:
1954 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1955 case IEEE80211_STYPE_AUTH:
1956 case IEEE80211_STYPE_ASSOC_RESP:
1957 case IEEE80211_STYPE_REASSOC_RESP:
1958 case IEEE80211_STYPE_DEAUTH:
1959 case IEEE80211_STYPE_DISASSOC:
1960 skb_queue_tail(&ifsta->skb_queue, skb);
1961 queue_work(local->hw.workqueue, &ifsta->work);
1962 return;
1963 }
1964
1965 fail:
1966 kfree_skb(skb);
1967 }
1968
1969 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1970 struct sk_buff *skb)
1971 {
1972 struct ieee80211_rx_status *rx_status;
1973 struct ieee80211_if_sta *ifsta;
1974 struct ieee80211_mgmt *mgmt;
1975 u16 fc;
1976
1977 ifsta = &sdata->u.sta;
1978
1979 rx_status = (struct ieee80211_rx_status *) skb->cb;
1980 mgmt = (struct ieee80211_mgmt *) skb->data;
1981 fc = le16_to_cpu(mgmt->frame_control);
1982
1983 switch (fc & IEEE80211_FCTL_STYPE) {
1984 case IEEE80211_STYPE_PROBE_REQ:
1985 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
1986 break;
1987 case IEEE80211_STYPE_PROBE_RESP:
1988 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1989 break;
1990 case IEEE80211_STYPE_BEACON:
1991 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1992 break;
1993 case IEEE80211_STYPE_AUTH:
1994 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1995 break;
1996 case IEEE80211_STYPE_ASSOC_RESP:
1997 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1998 break;
1999 case IEEE80211_STYPE_REASSOC_RESP:
2000 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2001 break;
2002 case IEEE80211_STYPE_DEAUTH:
2003 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2004 break;
2005 case IEEE80211_STYPE_DISASSOC:
2006 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2007 break;
2008 }
2009
2010 kfree_skb(skb);
2011 }
2012
2013
2014 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
2015 {
2016 struct ieee80211_local *local = sdata->local;
2017 int active = 0;
2018 struct sta_info *sta;
2019
2020 rcu_read_lock();
2021
2022 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2023 if (sta->sdata == sdata &&
2024 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2025 jiffies)) {
2026 active++;
2027 break;
2028 }
2029 }
2030
2031 rcu_read_unlock();
2032
2033 return active;
2034 }
2035
2036
2037 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2038 struct ieee80211_if_sta *ifsta)
2039 {
2040 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2041
2042 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2043 if (ieee80211_sta_active_ibss(sdata))
2044 return;
2045
2046 if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2047 (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2048 return;
2049
2050 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2051 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2052 ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
2053 }
2054
2055
2056 static void ieee80211_sta_timer(unsigned long data)
2057 {
2058 struct ieee80211_sub_if_data *sdata =
2059 (struct ieee80211_sub_if_data *) data;
2060 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2061 struct ieee80211_local *local = sdata->local;
2062
2063 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2064 queue_work(local->hw.workqueue, &ifsta->work);
2065 }
2066
2067 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2068 struct ieee80211_if_sta *ifsta)
2069 {
2070 struct ieee80211_local *local = sdata->local;
2071
2072 if (local->ops->reset_tsf) {
2073 /* Reset own TSF to allow time synchronization work. */
2074 local->ops->reset_tsf(local_to_hw(local));
2075 }
2076
2077 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2078
2079
2080 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2081 ifsta->auth_alg = WLAN_AUTH_OPEN;
2082 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2083 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2084 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2085 ifsta->auth_alg = WLAN_AUTH_LEAP;
2086 else
2087 ifsta->auth_alg = WLAN_AUTH_OPEN;
2088 ifsta->auth_transaction = -1;
2089 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2090 ifsta->assoc_scan_tries = 0;
2091 ifsta->direct_probe_tries = 0;
2092 ifsta->auth_tries = 0;
2093 ifsta->assoc_tries = 0;
2094 netif_tx_stop_all_queues(sdata->dev);
2095 netif_carrier_off(sdata->dev);
2096 }
2097
2098
2099 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2100 const char *ssid, int ssid_len)
2101 {
2102 int tmp, hidden_ssid;
2103
2104 if (ssid_len == ifsta->ssid_len &&
2105 !memcmp(ifsta->ssid, ssid, ssid_len))
2106 return 1;
2107
2108 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2109 return 0;
2110
2111 hidden_ssid = 1;
2112 tmp = ssid_len;
2113 while (tmp--) {
2114 if (ssid[tmp] != '\0') {
2115 hidden_ssid = 0;
2116 break;
2117 }
2118 }
2119
2120 if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2121 return 1;
2122
2123 if (ssid_len == 1 && ssid[0] == ' ')
2124 return 1;
2125
2126 return 0;
2127 }
2128
2129 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2130 struct ieee80211_if_sta *ifsta)
2131 {
2132 struct ieee80211_local *local = sdata->local;
2133 struct ieee80211_bss *bss;
2134 struct ieee80211_supported_band *sband;
2135 u8 bssid[ETH_ALEN], *pos;
2136 int i;
2137 int ret;
2138
2139 #if 0
2140 /* Easier testing, use fixed BSSID. */
2141 memset(bssid, 0xfe, ETH_ALEN);
2142 #else
2143 /* Generate random, not broadcast, locally administered BSSID. Mix in
2144 * own MAC address to make sure that devices that do not have proper
2145 * random number generator get different BSSID. */
2146 get_random_bytes(bssid, ETH_ALEN);
2147 for (i = 0; i < ETH_ALEN; i++)
2148 bssid[i] ^= sdata->dev->dev_addr[i];
2149 bssid[0] &= ~0x01;
2150 bssid[0] |= 0x02;
2151 #endif
2152
2153 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2154 sdata->dev->name, bssid);
2155
2156 bss = ieee80211_rx_bss_add(local, bssid,
2157 local->hw.conf.channel->center_freq,
2158 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2159 if (!bss)
2160 return -ENOMEM;
2161
2162 bss->band = local->hw.conf.channel->band;
2163 sband = local->hw.wiphy->bands[bss->band];
2164
2165 if (local->hw.conf.beacon_int == 0)
2166 local->hw.conf.beacon_int = 100;
2167 bss->beacon_int = local->hw.conf.beacon_int;
2168 bss->last_update = jiffies;
2169 bss->capability = WLAN_CAPABILITY_IBSS;
2170
2171 if (sdata->default_key)
2172 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2173 else
2174 sdata->drop_unencrypted = 0;
2175
2176 bss->supp_rates_len = sband->n_bitrates;
2177 pos = bss->supp_rates;
2178 for (i = 0; i < sband->n_bitrates; i++) {
2179 int rate = sband->bitrates[i].bitrate;
2180 *pos++ = (u8) (rate / 5);
2181 }
2182
2183 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2184 ieee80211_rx_bss_put(local, bss);
2185 return ret;
2186 }
2187
2188
2189 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2190 struct ieee80211_if_sta *ifsta)
2191 {
2192 struct ieee80211_local *local = sdata->local;
2193 struct ieee80211_bss *bss;
2194 int found = 0;
2195 u8 bssid[ETH_ALEN];
2196 int active_ibss;
2197
2198 if (ifsta->ssid_len == 0)
2199 return -EINVAL;
2200
2201 active_ibss = ieee80211_sta_active_ibss(sdata);
2202 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2203 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2204 sdata->dev->name, active_ibss);
2205 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2206 spin_lock_bh(&local->bss_lock);
2207 list_for_each_entry(bss, &local->bss_list, list) {
2208 if (ifsta->ssid_len != bss->ssid_len ||
2209 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2210 || !(bss->capability & WLAN_CAPABILITY_IBSS))
2211 continue;
2212 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2213 printk(KERN_DEBUG " bssid=%pM found\n", bss->bssid);
2214 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2215 memcpy(bssid, bss->bssid, ETH_ALEN);
2216 found = 1;
2217 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2218 break;
2219 }
2220 spin_unlock_bh(&local->bss_lock);
2221
2222 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2223 if (found)
2224 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
2225 "%pM\n", bssid, ifsta->bssid);
2226 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2227
2228 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2229 int ret;
2230 int search_freq;
2231
2232 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2233 search_freq = bss->freq;
2234 else
2235 search_freq = local->hw.conf.channel->center_freq;
2236
2237 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2238 ifsta->ssid, ifsta->ssid_len);
2239 if (!bss)
2240 goto dont_join;
2241
2242 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2243 " based on configured SSID\n",
2244 sdata->dev->name, bssid);
2245 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2246 ieee80211_rx_bss_put(local, bss);
2247 return ret;
2248 }
2249
2250 dont_join:
2251 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2252 printk(KERN_DEBUG " did not try to join ibss\n");
2253 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2254
2255 /* Selected IBSS not found in current scan results - try to scan */
2256 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2257 !ieee80211_sta_active_ibss(sdata)) {
2258 mod_timer(&ifsta->timer, jiffies +
2259 IEEE80211_IBSS_MERGE_INTERVAL);
2260 } else if (time_after(jiffies, local->last_scan_completed +
2261 IEEE80211_SCAN_INTERVAL)) {
2262 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2263 "join\n", sdata->dev->name);
2264 return ieee80211_request_scan(sdata, ifsta->ssid,
2265 ifsta->ssid_len);
2266 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2267 int interval = IEEE80211_SCAN_INTERVAL;
2268
2269 if (time_after(jiffies, ifsta->ibss_join_req +
2270 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2271 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2272 (!(local->oper_channel->flags &
2273 IEEE80211_CHAN_NO_IBSS)))
2274 return ieee80211_sta_create_ibss(sdata, ifsta);
2275 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2276 printk(KERN_DEBUG "%s: IBSS not allowed on"
2277 " %d MHz\n", sdata->dev->name,
2278 local->hw.conf.channel->center_freq);
2279 }
2280
2281 /* No IBSS found - decrease scan interval and continue
2282 * scanning. */
2283 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2284 }
2285
2286 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2287 mod_timer(&ifsta->timer, jiffies + interval);
2288 return 0;
2289 }
2290
2291 return 0;
2292 }
2293
2294
2295 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2296 struct ieee80211_if_sta *ifsta)
2297 {
2298 struct ieee80211_local *local = sdata->local;
2299 struct ieee80211_bss *bss, *selected = NULL;
2300 int top_rssi = 0, freq;
2301
2302 spin_lock_bh(&local->bss_lock);
2303 freq = local->oper_channel->center_freq;
2304 list_for_each_entry(bss, &local->bss_list, list) {
2305 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2306 continue;
2307
2308 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2309 IEEE80211_STA_AUTO_BSSID_SEL |
2310 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2311 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2312 !!sdata->default_key))
2313 continue;
2314
2315 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2316 bss->freq != freq)
2317 continue;
2318
2319 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2320 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2321 continue;
2322
2323 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2324 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2325 continue;
2326
2327 if (!selected || top_rssi < bss->signal) {
2328 selected = bss;
2329 top_rssi = bss->signal;
2330 }
2331 }
2332 if (selected)
2333 atomic_inc(&selected->users);
2334 spin_unlock_bh(&local->bss_lock);
2335
2336 if (selected) {
2337 ieee80211_set_freq(sdata, selected->freq);
2338 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2339 ieee80211_sta_set_ssid(sdata, selected->ssid,
2340 selected->ssid_len);
2341 ieee80211_sta_set_bssid(sdata, selected->bssid);
2342 ieee80211_sta_def_wmm_params(sdata, selected);
2343 if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
2344 sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
2345 else
2346 sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
2347
2348 /* Send out direct probe if no probe resp was received or
2349 * the one we have is outdated
2350 */
2351 if (!selected->last_probe_resp ||
2352 time_after(jiffies, selected->last_probe_resp
2353 + IEEE80211_SCAN_RESULT_EXPIRE))
2354 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2355 else
2356 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2357
2358 ieee80211_rx_bss_put(local, selected);
2359 ieee80211_sta_reset_auth(sdata, ifsta);
2360 return 0;
2361 } else {
2362 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2363 ifsta->assoc_scan_tries++;
2364 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2365 ieee80211_start_scan(sdata, NULL, 0);
2366 else
2367 ieee80211_start_scan(sdata, ifsta->ssid,
2368 ifsta->ssid_len);
2369 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2370 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2371 } else
2372 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2373 }
2374 return -1;
2375 }
2376
2377
2378 static void ieee80211_sta_work(struct work_struct *work)
2379 {
2380 struct ieee80211_sub_if_data *sdata =
2381 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2382 struct ieee80211_local *local = sdata->local;
2383 struct ieee80211_if_sta *ifsta;
2384 struct sk_buff *skb;
2385
2386 if (!netif_running(sdata->dev))
2387 return;
2388
2389 if (local->sw_scanning || local->hw_scanning)
2390 return;
2391
2392 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2393 sdata->vif.type != NL80211_IFTYPE_ADHOC))
2394 return;
2395 ifsta = &sdata->u.sta;
2396
2397 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2398 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2399
2400 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2401 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2402 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2403 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2404 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2405 ifsta->scan_ssid_len);
2406 return;
2407 }
2408
2409 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2410 if (ieee80211_sta_config_auth(sdata, ifsta))
2411 return;
2412 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2413 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2414 return;
2415
2416 switch (ifsta->state) {
2417 case IEEE80211_STA_MLME_DISABLED:
2418 break;
2419 case IEEE80211_STA_MLME_DIRECT_PROBE:
2420 ieee80211_direct_probe(sdata, ifsta);
2421 break;
2422 case IEEE80211_STA_MLME_AUTHENTICATE:
2423 ieee80211_authenticate(sdata, ifsta);
2424 break;
2425 case IEEE80211_STA_MLME_ASSOCIATE:
2426 ieee80211_associate(sdata, ifsta);
2427 break;
2428 case IEEE80211_STA_MLME_ASSOCIATED:
2429 ieee80211_associated(sdata, ifsta);
2430 break;
2431 case IEEE80211_STA_MLME_IBSS_SEARCH:
2432 ieee80211_sta_find_ibss(sdata, ifsta);
2433 break;
2434 case IEEE80211_STA_MLME_IBSS_JOINED:
2435 ieee80211_sta_merge_ibss(sdata, ifsta);
2436 break;
2437 default:
2438 WARN_ON(1);
2439 break;
2440 }
2441
2442 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2443 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2444 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2445
2446 ieee80211_set_disassoc(sdata, ifsta, false, true,
2447 WLAN_REASON_UNSPECIFIED);
2448 }
2449 }
2450
2451 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2452 {
2453 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2454 queue_work(sdata->local->hw.workqueue,
2455 &sdata->u.sta.work);
2456 }
2457
2458 /* interface setup */
2459 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2460 {
2461 struct ieee80211_if_sta *ifsta;
2462
2463 ifsta = &sdata->u.sta;
2464 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2465 INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2466 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2467 (unsigned long) sdata);
2468 setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2469 (unsigned long) sdata);
2470 skb_queue_head_init(&ifsta->skb_queue);
2471
2472 ifsta->capab = WLAN_CAPABILITY_ESS;
2473 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2474 IEEE80211_AUTH_ALG_SHARED_KEY;
2475 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2476 IEEE80211_STA_AUTO_BSSID_SEL |
2477 IEEE80211_STA_AUTO_CHANNEL_SEL;
2478 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2479 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2480 }
2481
2482 /*
2483 * Add a new IBSS station, will also be called by the RX code when,
2484 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2485 * must be callable in atomic context.
2486 */
2487 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2488 u8 *bssid,u8 *addr, u64 supp_rates)
2489 {
2490 struct ieee80211_local *local = sdata->local;
2491 struct sta_info *sta;
2492 int band = local->hw.conf.channel->band;
2493
2494 /* TODO: Could consider removing the least recently used entry and
2495 * allow new one to be added. */
2496 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2497 if (net_ratelimit()) {
2498 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2499 "entry %pM\n", sdata->dev->name, addr);
2500 }
2501 return NULL;
2502 }
2503
2504 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2505 return NULL;
2506
2507 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2508 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2509 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2510 #endif
2511
2512 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2513 if (!sta)
2514 return NULL;
2515
2516 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2517
2518 /* make sure mandatory rates are always added */
2519 sta->sta.supp_rates[band] = supp_rates |
2520 ieee80211_mandatory_rates(local, band);
2521
2522 rate_control_rate_init(sta);
2523
2524 if (sta_info_insert(sta))
2525 return NULL;
2526
2527 return sta;
2528 }
2529
2530 /* configuration hooks */
2531 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2532 struct ieee80211_if_sta *ifsta)
2533 {
2534 struct ieee80211_local *local = sdata->local;
2535
2536 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2537 return;
2538
2539 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2540 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2541 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2542 IEEE80211_STA_AUTO_SSID_SEL))) {
2543
2544 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2545 ieee80211_set_disassoc(sdata, ifsta, true, true,
2546 WLAN_REASON_DEAUTH_LEAVING);
2547
2548 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2549 queue_work(local->hw.workqueue, &ifsta->work);
2550 }
2551 }
2552
2553 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2554 {
2555 struct ieee80211_if_sta *ifsta;
2556
2557 if (len > IEEE80211_MAX_SSID_LEN)
2558 return -EINVAL;
2559
2560 ifsta = &sdata->u.sta;
2561
2562 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2563 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2564 memcpy(ifsta->ssid, ssid, len);
2565 ifsta->ssid_len = len;
2566 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2567 }
2568
2569 if (len)
2570 ifsta->flags |= IEEE80211_STA_SSID_SET;
2571 else
2572 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2573
2574 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2575 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2576 ifsta->ibss_join_req = jiffies;
2577 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2578 return ieee80211_sta_find_ibss(sdata, ifsta);
2579 }
2580
2581 return 0;
2582 }
2583
2584 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2585 {
2586 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2587 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2588 *len = ifsta->ssid_len;
2589 return 0;
2590 }
2591
2592 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2593 {
2594 struct ieee80211_if_sta *ifsta;
2595 int res;
2596 bool valid;
2597
2598 ifsta = &sdata->u.sta;
2599 valid = is_valid_ether_addr(bssid);
2600
2601 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2602 if(valid)
2603 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2604 else
2605 memset(ifsta->bssid, 0, ETH_ALEN);
2606 res = 0;
2607 /*
2608 * Hack! See also ieee80211_sta_set_ssid.
2609 */
2610 if (netif_running(sdata->dev))
2611 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2612 if (res) {
2613 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2614 "the low-level driver\n", sdata->dev->name);
2615 return res;
2616 }
2617 }
2618
2619 if (valid)
2620 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2621 else
2622 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2623
2624 return 0;
2625 }
2626
2627 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2628 {
2629 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2630
2631 kfree(ifsta->extra_ie);
2632 if (len == 0) {
2633 ifsta->extra_ie = NULL;
2634 ifsta->extra_ie_len = 0;
2635 return 0;
2636 }
2637 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2638 if (!ifsta->extra_ie) {
2639 ifsta->extra_ie_len = 0;
2640 return -ENOMEM;
2641 }
2642 memcpy(ifsta->extra_ie, ie, len);
2643 ifsta->extra_ie_len = len;
2644 return 0;
2645 }
2646
2647 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2648 {
2649 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2650
2651 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2652 sdata->dev->name, reason);
2653
2654 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2655 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2656 return -EINVAL;
2657
2658 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2659 return 0;
2660 }
2661
2662 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2663 {
2664 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2665
2666 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2667 sdata->dev->name, reason);
2668
2669 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2670 return -EINVAL;
2671
2672 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2673 return -1;
2674
2675 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2676 return 0;
2677 }
2678
2679 /* scan finished notification */
2680 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2681 {
2682 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2683 struct ieee80211_if_sta *ifsta;
2684
2685 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2686 ifsta = &sdata->u.sta;
2687 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2688 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2689 !ieee80211_sta_active_ibss(sdata)))
2690 ieee80211_sta_find_ibss(sdata, ifsta);
2691 }
2692
2693 /* Restart STA timers */
2694 rcu_read_lock();
2695 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2696 ieee80211_restart_sta_timer(sdata);
2697 rcu_read_unlock();
2698 }
2699
2700 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2701 {
2702 struct ieee80211_local *local =
2703 container_of(work, struct ieee80211_local,
2704 dynamic_ps_disable_work);
2705
2706 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2707 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2708 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2709 }
2710
2711 ieee80211_wake_queues_by_reason(&local->hw,
2712 IEEE80211_QUEUE_STOP_REASON_PS);
2713 }
2714
2715 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2716 {
2717 struct ieee80211_local *local =
2718 container_of(work, struct ieee80211_local,
2719 dynamic_ps_enable_work);
2720 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2721
2722 if (local->hw.conf.flags & IEEE80211_CONF_PS)
2723 return;
2724
2725 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2726 ieee80211_send_nullfunc(local, sdata, 1);
2727
2728 local->hw.conf.flags |= IEEE80211_CONF_PS;
2729 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2730 }
2731
2732 void ieee80211_dynamic_ps_timer(unsigned long data)
2733 {
2734 struct ieee80211_local *local = (void *) data;
2735
2736 queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2737 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree