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mac80211: extend/document powersave API
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.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, 0);
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 del_timer_sync(&local->dynamic_ps_timer);
909 cancel_work_sync(&local->dynamic_ps_enable_work);
910
911 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
912 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
913 config_changed |= IEEE80211_CONF_CHANGE_PS;
914 }
915
916 ieee80211_hw_config(local, config_changed);
917 ieee80211_bss_info_change_notify(sdata, changed);
918
919 rcu_read_lock();
920
921 sta = sta_info_get(local, ifsta->bssid);
922 if (!sta) {
923 rcu_read_unlock();
924 return;
925 }
926
927 sta_info_unlink(&sta);
928
929 rcu_read_unlock();
930
931 sta_info_destroy(sta);
932 }
933
934 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
935 {
936 if (!sdata || !sdata->default_key ||
937 sdata->default_key->conf.alg != ALG_WEP)
938 return 0;
939 return 1;
940 }
941
942 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
943 struct ieee80211_if_sta *ifsta)
944 {
945 struct ieee80211_local *local = sdata->local;
946 struct ieee80211_bss *bss;
947 int bss_privacy;
948 int wep_privacy;
949 int privacy_invoked;
950
951 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
952 return 0;
953
954 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
955 local->hw.conf.channel->center_freq,
956 ifsta->ssid, ifsta->ssid_len);
957 if (!bss)
958 return 0;
959
960 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
961 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
962 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
963
964 ieee80211_rx_bss_put(local, bss);
965
966 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
967 return 0;
968
969 return 1;
970 }
971
972 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
973 struct ieee80211_if_sta *ifsta)
974 {
975 ifsta->assoc_tries++;
976 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
977 printk(KERN_DEBUG "%s: association with AP %pM"
978 " timed out\n",
979 sdata->dev->name, ifsta->bssid);
980 ifsta->state = IEEE80211_STA_MLME_DISABLED;
981 ieee80211_sta_send_apinfo(sdata, ifsta);
982 return;
983 }
984
985 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
986 printk(KERN_DEBUG "%s: associate with AP %pM\n",
987 sdata->dev->name, ifsta->bssid);
988 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
989 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
990 "mixed-cell disabled - abort association\n", sdata->dev->name);
991 ifsta->state = IEEE80211_STA_MLME_DISABLED;
992 return;
993 }
994
995 ieee80211_send_assoc(sdata, ifsta);
996
997 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
998 }
999
1000
1001 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1002 struct ieee80211_if_sta *ifsta)
1003 {
1004 struct ieee80211_local *local = sdata->local;
1005 struct sta_info *sta;
1006 int disassoc;
1007
1008 /* TODO: start monitoring current AP signal quality and number of
1009 * missed beacons. Scan other channels every now and then and search
1010 * for better APs. */
1011 /* TODO: remove expired BSSes */
1012
1013 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1014
1015 rcu_read_lock();
1016
1017 sta = sta_info_get(local, ifsta->bssid);
1018 if (!sta) {
1019 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1020 sdata->dev->name, ifsta->bssid);
1021 disassoc = 1;
1022 } else {
1023 disassoc = 0;
1024 if (time_after(jiffies,
1025 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1026 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1027 printk(KERN_DEBUG "%s: No ProbeResp from "
1028 "current AP %pM - assume out of "
1029 "range\n",
1030 sdata->dev->name, ifsta->bssid);
1031 disassoc = 1;
1032 } else
1033 ieee80211_send_probe_req(sdata, ifsta->bssid,
1034 ifsta->ssid,
1035 ifsta->ssid_len);
1036 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1037 } else {
1038 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1039 if (time_after(jiffies, ifsta->last_probe +
1040 IEEE80211_PROBE_INTERVAL)) {
1041 ifsta->last_probe = jiffies;
1042 ieee80211_send_probe_req(sdata, ifsta->bssid,
1043 ifsta->ssid,
1044 ifsta->ssid_len);
1045 }
1046 }
1047 }
1048
1049 rcu_read_unlock();
1050
1051 if (disassoc)
1052 ieee80211_set_disassoc(sdata, ifsta, true, true,
1053 WLAN_REASON_PREV_AUTH_NOT_VALID);
1054 else
1055 mod_timer(&ifsta->timer, jiffies +
1056 IEEE80211_MONITORING_INTERVAL);
1057 }
1058
1059
1060 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1061 struct ieee80211_if_sta *ifsta)
1062 {
1063 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1064 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1065 ieee80211_associate(sdata, ifsta);
1066 }
1067
1068
1069 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1070 struct ieee80211_if_sta *ifsta,
1071 struct ieee80211_mgmt *mgmt,
1072 size_t len)
1073 {
1074 u8 *pos;
1075 struct ieee802_11_elems elems;
1076
1077 pos = mgmt->u.auth.variable;
1078 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1079 if (!elems.challenge)
1080 return;
1081 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1082 elems.challenge_len + 2, 1);
1083 }
1084
1085 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1086 struct ieee80211_if_sta *ifsta,
1087 struct ieee80211_mgmt *mgmt,
1088 size_t len)
1089 {
1090 u16 auth_alg, auth_transaction, status_code;
1091
1092 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1093 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1094 return;
1095
1096 if (len < 24 + 6)
1097 return;
1098
1099 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1100 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1101 return;
1102
1103 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1104 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1105 return;
1106
1107 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1108 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1109 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1110
1111 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1112 /*
1113 * IEEE 802.11 standard does not require authentication in IBSS
1114 * networks and most implementations do not seem to use it.
1115 * However, try to reply to authentication attempts if someone
1116 * has actually implemented this.
1117 */
1118 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1119 return;
1120 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1121 }
1122
1123 if (auth_alg != ifsta->auth_alg ||
1124 auth_transaction != ifsta->auth_transaction)
1125 return;
1126
1127 if (status_code != WLAN_STATUS_SUCCESS) {
1128 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1129 u8 algs[3];
1130 const int num_algs = ARRAY_SIZE(algs);
1131 int i, pos;
1132 algs[0] = algs[1] = algs[2] = 0xff;
1133 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1134 algs[0] = WLAN_AUTH_OPEN;
1135 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1136 algs[1] = WLAN_AUTH_SHARED_KEY;
1137 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1138 algs[2] = WLAN_AUTH_LEAP;
1139 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1140 pos = 0;
1141 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1142 pos = 1;
1143 else
1144 pos = 2;
1145 for (i = 0; i < num_algs; i++) {
1146 pos++;
1147 if (pos >= num_algs)
1148 pos = 0;
1149 if (algs[pos] == ifsta->auth_alg ||
1150 algs[pos] == 0xff)
1151 continue;
1152 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1153 !ieee80211_sta_wep_configured(sdata))
1154 continue;
1155 ifsta->auth_alg = algs[pos];
1156 break;
1157 }
1158 }
1159 return;
1160 }
1161
1162 switch (ifsta->auth_alg) {
1163 case WLAN_AUTH_OPEN:
1164 case WLAN_AUTH_LEAP:
1165 ieee80211_auth_completed(sdata, ifsta);
1166 break;
1167 case WLAN_AUTH_SHARED_KEY:
1168 if (ifsta->auth_transaction == 4)
1169 ieee80211_auth_completed(sdata, ifsta);
1170 else
1171 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1172 break;
1173 }
1174 }
1175
1176
1177 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1178 struct ieee80211_if_sta *ifsta,
1179 struct ieee80211_mgmt *mgmt,
1180 size_t len)
1181 {
1182 u16 reason_code;
1183
1184 if (len < 24 + 2)
1185 return;
1186
1187 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1188 return;
1189
1190 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1191
1192 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1193 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1194 sdata->dev->name, reason_code);
1195
1196 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1197 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1198 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1199 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1200 mod_timer(&ifsta->timer, jiffies +
1201 IEEE80211_RETRY_AUTH_INTERVAL);
1202 }
1203
1204 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1205 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1206 }
1207
1208
1209 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1210 struct ieee80211_if_sta *ifsta,
1211 struct ieee80211_mgmt *mgmt,
1212 size_t len)
1213 {
1214 u16 reason_code;
1215
1216 if (len < 24 + 2)
1217 return;
1218
1219 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1220 return;
1221
1222 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1223
1224 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1225 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1226 sdata->dev->name, reason_code);
1227
1228 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1229 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1230 mod_timer(&ifsta->timer, jiffies +
1231 IEEE80211_RETRY_AUTH_INTERVAL);
1232 }
1233
1234 ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1235 }
1236
1237
1238 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1239 struct ieee80211_if_sta *ifsta,
1240 struct ieee80211_mgmt *mgmt,
1241 size_t len,
1242 int reassoc)
1243 {
1244 struct ieee80211_local *local = sdata->local;
1245 struct ieee80211_supported_band *sband;
1246 struct sta_info *sta;
1247 u64 rates, basic_rates;
1248 u16 capab_info, status_code, aid;
1249 struct ieee802_11_elems elems;
1250 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1251 u8 *pos;
1252 u32 changed = 0;
1253 int i, j;
1254 bool have_higher_than_11mbit = false, newsta = false;
1255 u16 ap_ht_cap_flags;
1256
1257 /* AssocResp and ReassocResp have identical structure, so process both
1258 * of them in this function. */
1259
1260 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1261 return;
1262
1263 if (len < 24 + 6)
1264 return;
1265
1266 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1267 return;
1268
1269 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1270 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1271 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1272
1273 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1274 "status=%d aid=%d)\n",
1275 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1276 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1277
1278 if (status_code != WLAN_STATUS_SUCCESS) {
1279 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1280 sdata->dev->name, status_code);
1281 /* if this was a reassociation, ensure we try a "full"
1282 * association next time. This works around some broken APs
1283 * which do not correctly reject reassociation requests. */
1284 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1285 return;
1286 }
1287
1288 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1289 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1290 "set\n", sdata->dev->name, aid);
1291 aid &= ~(BIT(15) | BIT(14));
1292
1293 pos = mgmt->u.assoc_resp.variable;
1294 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1295
1296 if (!elems.supp_rates) {
1297 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1298 sdata->dev->name);
1299 return;
1300 }
1301
1302 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1303 ifsta->aid = aid;
1304 ifsta->ap_capab = capab_info;
1305
1306 kfree(ifsta->assocresp_ies);
1307 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1308 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1309 if (ifsta->assocresp_ies)
1310 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1311
1312 rcu_read_lock();
1313
1314 /* Add STA entry for the AP */
1315 sta = sta_info_get(local, ifsta->bssid);
1316 if (!sta) {
1317 struct ieee80211_bss *bss;
1318
1319 newsta = true;
1320
1321 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1322 if (!sta) {
1323 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1324 " the AP\n", sdata->dev->name);
1325 rcu_read_unlock();
1326 return;
1327 }
1328 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1329 local->hw.conf.channel->center_freq,
1330 ifsta->ssid, ifsta->ssid_len);
1331 if (bss) {
1332 sta->last_signal = bss->signal;
1333 sta->last_qual = bss->qual;
1334 sta->last_noise = bss->noise;
1335 ieee80211_rx_bss_put(local, bss);
1336 }
1337
1338 /* update new sta with its last rx activity */
1339 sta->last_rx = jiffies;
1340 }
1341
1342 /*
1343 * FIXME: Do we really need to update the sta_info's information here?
1344 * We already know about the AP (we found it in our list) so it
1345 * should already be filled with the right info, no?
1346 * As is stands, all this is racy because typically we assume
1347 * the information that is filled in here (except flags) doesn't
1348 * change while a STA structure is alive. As such, it should move
1349 * to between the sta_info_alloc() and sta_info_insert() above.
1350 */
1351
1352 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1353 WLAN_STA_AUTHORIZED);
1354
1355 rates = 0;
1356 basic_rates = 0;
1357 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1358
1359 for (i = 0; i < elems.supp_rates_len; i++) {
1360 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1361 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1362
1363 if (rate > 110)
1364 have_higher_than_11mbit = true;
1365
1366 for (j = 0; j < sband->n_bitrates; j++) {
1367 if (sband->bitrates[j].bitrate == rate) {
1368 rates |= BIT(j);
1369 if (is_basic)
1370 basic_rates |= BIT(j);
1371 break;
1372 }
1373 }
1374 }
1375
1376 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1377 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1378 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1379
1380 if (rate > 110)
1381 have_higher_than_11mbit = true;
1382
1383 for (j = 0; j < sband->n_bitrates; j++) {
1384 if (sband->bitrates[j].bitrate == rate) {
1385 rates |= BIT(j);
1386 if (is_basic)
1387 basic_rates |= BIT(j);
1388 break;
1389 }
1390 }
1391 }
1392
1393 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1394 sdata->vif.bss_conf.basic_rates = basic_rates;
1395
1396 /* cf. IEEE 802.11 9.2.12 */
1397 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1398 have_higher_than_11mbit)
1399 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1400 else
1401 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1402
1403 if (elems.ht_cap_elem)
1404 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1405 elems.ht_cap_elem, &sta->sta.ht_cap);
1406
1407 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1408
1409 rate_control_rate_init(sta);
1410
1411 if (elems.wmm_param)
1412 set_sta_flags(sta, WLAN_STA_WME);
1413
1414 if (newsta) {
1415 int err = sta_info_insert(sta);
1416 if (err) {
1417 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1418 " the AP (error %d)\n", sdata->dev->name, err);
1419 rcu_read_unlock();
1420 return;
1421 }
1422 }
1423
1424 rcu_read_unlock();
1425
1426 if (elems.wmm_param)
1427 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1428 elems.wmm_param_len);
1429
1430 if (elems.ht_info_elem && elems.wmm_param &&
1431 (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1432 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1433 ap_ht_cap_flags);
1434
1435 /* set AID and assoc capability,
1436 * ieee80211_set_associated() will tell the driver */
1437 bss_conf->aid = aid;
1438 bss_conf->assoc_capability = capab_info;
1439 ieee80211_set_associated(sdata, ifsta, changed);
1440
1441 ieee80211_associated(sdata, ifsta);
1442 }
1443
1444
1445 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1446 struct ieee80211_if_sta *ifsta,
1447 struct ieee80211_bss *bss)
1448 {
1449 struct ieee80211_local *local = sdata->local;
1450 int res, rates, i, j;
1451 struct sk_buff *skb;
1452 struct ieee80211_mgmt *mgmt;
1453 u8 *pos;
1454 struct ieee80211_supported_band *sband;
1455 union iwreq_data wrqu;
1456
1457 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1458 if (!skb) {
1459 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1460 "response\n", sdata->dev->name);
1461 return -ENOMEM;
1462 }
1463
1464 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1465
1466 /* Remove possible STA entries from other IBSS networks. */
1467 sta_info_flush_delayed(sdata);
1468
1469 if (local->ops->reset_tsf) {
1470 /* Reset own TSF to allow time synchronization work. */
1471 local->ops->reset_tsf(local_to_hw(local));
1472 }
1473 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1474 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1475 if (res)
1476 return res;
1477
1478 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1479
1480 sdata->drop_unencrypted = bss->capability &
1481 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1482
1483 res = ieee80211_set_freq(sdata, bss->freq);
1484
1485 if (res)
1486 return res;
1487
1488 /* Build IBSS probe response */
1489
1490 skb_reserve(skb, local->hw.extra_tx_headroom);
1491
1492 mgmt = (struct ieee80211_mgmt *)
1493 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1494 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1495 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1496 IEEE80211_STYPE_PROBE_RESP);
1497 memset(mgmt->da, 0xff, ETH_ALEN);
1498 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1499 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1500 mgmt->u.beacon.beacon_int =
1501 cpu_to_le16(local->hw.conf.beacon_int);
1502 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1503 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1504
1505 pos = skb_put(skb, 2 + ifsta->ssid_len);
1506 *pos++ = WLAN_EID_SSID;
1507 *pos++ = ifsta->ssid_len;
1508 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1509
1510 rates = bss->supp_rates_len;
1511 if (rates > 8)
1512 rates = 8;
1513 pos = skb_put(skb, 2 + rates);
1514 *pos++ = WLAN_EID_SUPP_RATES;
1515 *pos++ = rates;
1516 memcpy(pos, bss->supp_rates, rates);
1517
1518 if (bss->band == IEEE80211_BAND_2GHZ) {
1519 pos = skb_put(skb, 2 + 1);
1520 *pos++ = WLAN_EID_DS_PARAMS;
1521 *pos++ = 1;
1522 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1523 }
1524
1525 pos = skb_put(skb, 2 + 2);
1526 *pos++ = WLAN_EID_IBSS_PARAMS;
1527 *pos++ = 2;
1528 /* FIX: set ATIM window based on scan results */
1529 *pos++ = 0;
1530 *pos++ = 0;
1531
1532 if (bss->supp_rates_len > 8) {
1533 rates = bss->supp_rates_len - 8;
1534 pos = skb_put(skb, 2 + rates);
1535 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1536 *pos++ = rates;
1537 memcpy(pos, &bss->supp_rates[8], rates);
1538 }
1539
1540 ifsta->probe_resp = skb;
1541
1542 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1543
1544
1545 rates = 0;
1546 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1547 for (i = 0; i < bss->supp_rates_len; i++) {
1548 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1549 for (j = 0; j < sband->n_bitrates; j++)
1550 if (sband->bitrates[j].bitrate == bitrate)
1551 rates |= BIT(j);
1552 }
1553 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1554
1555 ieee80211_sta_def_wmm_params(sdata, bss);
1556
1557 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1558 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1559
1560 ieee80211_led_assoc(local, true);
1561
1562 memset(&wrqu, 0, sizeof(wrqu));
1563 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1564 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1565
1566 return res;
1567 }
1568
1569 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1570 struct ieee80211_mgmt *mgmt,
1571 size_t len,
1572 struct ieee80211_rx_status *rx_status,
1573 struct ieee802_11_elems *elems,
1574 bool beacon)
1575 {
1576 struct ieee80211_local *local = sdata->local;
1577 int freq;
1578 struct ieee80211_bss *bss;
1579 struct sta_info *sta;
1580 struct ieee80211_channel *channel;
1581 u64 beacon_timestamp, rx_timestamp;
1582 u64 supp_rates = 0;
1583 enum ieee80211_band band = rx_status->band;
1584
1585 if (elems->ds_params && elems->ds_params_len == 1)
1586 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1587 else
1588 freq = rx_status->freq;
1589
1590 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1591
1592 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1593 return;
1594
1595 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1596 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1597 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1598
1599 rcu_read_lock();
1600
1601 sta = sta_info_get(local, mgmt->sa);
1602 if (sta) {
1603 u64 prev_rates;
1604
1605 prev_rates = sta->sta.supp_rates[band];
1606 /* make sure mandatory rates are always added */
1607 sta->sta.supp_rates[band] = supp_rates |
1608 ieee80211_mandatory_rates(local, band);
1609
1610 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1611 if (sta->sta.supp_rates[band] != prev_rates)
1612 printk(KERN_DEBUG "%s: updated supp_rates set "
1613 "for %pM based on beacon info (0x%llx | "
1614 "0x%llx -> 0x%llx)\n",
1615 sdata->dev->name,
1616 sta->sta.addr,
1617 (unsigned long long) prev_rates,
1618 (unsigned long long) supp_rates,
1619 (unsigned long long) sta->sta.supp_rates[band]);
1620 #endif
1621 } else {
1622 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1623 }
1624
1625 rcu_read_unlock();
1626 }
1627
1628 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1629 freq, beacon);
1630 if (!bss)
1631 return;
1632
1633 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1634 (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1635 struct ieee80211_channel_sw_ie *sw_elem =
1636 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1637 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1638 }
1639
1640 /* was just updated in ieee80211_bss_info_update */
1641 beacon_timestamp = bss->timestamp;
1642
1643 /*
1644 * In STA mode, the remaining parameters should not be overridden
1645 * by beacons because they're not necessarily accurate there.
1646 */
1647 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1648 bss->last_probe_resp && beacon) {
1649 ieee80211_rx_bss_put(local, bss);
1650 return;
1651 }
1652
1653 /* check if we need to merge IBSS */
1654 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1655 (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1656 bss->capability & WLAN_CAPABILITY_IBSS &&
1657 bss->freq == local->oper_channel->center_freq &&
1658 elems->ssid_len == sdata->u.sta.ssid_len &&
1659 memcmp(elems->ssid, sdata->u.sta.ssid,
1660 sdata->u.sta.ssid_len) == 0) {
1661 if (rx_status->flag & RX_FLAG_TSFT) {
1662 /* in order for correct IBSS merging we need mactime
1663 *
1664 * since mactime is defined as the time the first data
1665 * symbol of the frame hits the PHY, and the timestamp
1666 * of the beacon is defined as "the time that the data
1667 * symbol containing the first bit of the timestamp is
1668 * transmitted to the PHY plus the transmitting STA’s
1669 * delays through its local PHY from the MAC-PHY
1670 * interface to its interface with the WM"
1671 * (802.11 11.1.2) - equals the time this bit arrives at
1672 * the receiver - we have to take into account the
1673 * offset between the two.
1674 * e.g: at 1 MBit that means mactime is 192 usec earlier
1675 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1676 */
1677 int rate;
1678 if (rx_status->flag & RX_FLAG_HT) {
1679 rate = 65; /* TODO: HT rates */
1680 } else {
1681 rate = local->hw.wiphy->bands[band]->
1682 bitrates[rx_status->rate_idx].bitrate;
1683 }
1684 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1685 } else if (local && local->ops && local->ops->get_tsf)
1686 /* second best option: get current TSF */
1687 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1688 else
1689 /* can't merge without knowing the TSF */
1690 rx_timestamp = -1LLU;
1691 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1692 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1693 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1694 mgmt->sa, mgmt->bssid,
1695 (unsigned long long)rx_timestamp,
1696 (unsigned long long)beacon_timestamp,
1697 (unsigned long long)(rx_timestamp - beacon_timestamp),
1698 jiffies);
1699 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1700 if (beacon_timestamp > rx_timestamp) {
1701 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1702 printk(KERN_DEBUG "%s: beacon TSF higher than "
1703 "local TSF - IBSS merge with BSSID %pM\n",
1704 sdata->dev->name, mgmt->bssid);
1705 #endif
1706 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1707 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1708 }
1709 }
1710
1711 ieee80211_rx_bss_put(local, bss);
1712 }
1713
1714
1715 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1716 struct ieee80211_mgmt *mgmt,
1717 size_t len,
1718 struct ieee80211_rx_status *rx_status)
1719 {
1720 size_t baselen;
1721 struct ieee802_11_elems elems;
1722 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1723
1724 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1725 return; /* ignore ProbeResp to foreign address */
1726
1727 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1728 if (baselen > len)
1729 return;
1730
1731 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1732 &elems);
1733
1734 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1735
1736 /* direct probe may be part of the association flow */
1737 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1738 &ifsta->request)) {
1739 printk(KERN_DEBUG "%s direct probe responded\n",
1740 sdata->dev->name);
1741 ieee80211_authenticate(sdata, ifsta);
1742 }
1743 }
1744
1745
1746 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1747 struct ieee80211_mgmt *mgmt,
1748 size_t len,
1749 struct ieee80211_rx_status *rx_status)
1750 {
1751 struct ieee80211_if_sta *ifsta;
1752 size_t baselen;
1753 struct ieee802_11_elems elems;
1754 struct ieee80211_local *local = sdata->local;
1755 u32 changed = 0;
1756 bool erp_valid, directed_tim, is_mc = false;
1757 u8 erp_value = 0;
1758
1759 /* Process beacon from the current BSS */
1760 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1761 if (baselen > len)
1762 return;
1763
1764 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1765
1766 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1767
1768 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1769 return;
1770 ifsta = &sdata->u.sta;
1771
1772 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1773 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1774 return;
1775
1776 if (rx_status->freq != local->hw.conf.channel->center_freq)
1777 return;
1778
1779 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1780 elems.wmm_param_len);
1781
1782 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1783 local->hw.conf.flags & IEEE80211_CONF_PS) {
1784 directed_tim = check_tim(&elems, ifsta->aid, &is_mc);
1785
1786 if (directed_tim || is_mc) {
1787 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1788 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1789 ieee80211_send_nullfunc(local, sdata, 0);
1790 }
1791 }
1792
1793 if (elems.erp_info && elems.erp_info_len >= 1) {
1794 erp_valid = true;
1795 erp_value = elems.erp_info[0];
1796 } else {
1797 erp_valid = false;
1798 }
1799 changed |= ieee80211_handle_bss_capability(sdata,
1800 le16_to_cpu(mgmt->u.beacon.capab_info),
1801 erp_valid, erp_value);
1802
1803
1804 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1805 struct sta_info *sta;
1806 struct ieee80211_supported_band *sband;
1807 u16 ap_ht_cap_flags;
1808
1809 rcu_read_lock();
1810
1811 sta = sta_info_get(local, ifsta->bssid);
1812 if (!sta) {
1813 rcu_read_unlock();
1814 return;
1815 }
1816
1817 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1818
1819 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1820 elems.ht_cap_elem, &sta->sta.ht_cap);
1821
1822 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1823
1824 rcu_read_unlock();
1825
1826 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1827 ap_ht_cap_flags);
1828 }
1829
1830 if (elems.country_elem) {
1831 /* Note we are only reviewing this on beacons
1832 * for the BSSID we are associated to */
1833 regulatory_hint_11d(local->hw.wiphy,
1834 elems.country_elem, elems.country_elem_len);
1835 }
1836
1837 ieee80211_bss_info_change_notify(sdata, changed);
1838 }
1839
1840
1841 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1842 struct ieee80211_if_sta *ifsta,
1843 struct ieee80211_mgmt *mgmt,
1844 size_t len)
1845 {
1846 struct ieee80211_local *local = sdata->local;
1847 int tx_last_beacon;
1848 struct sk_buff *skb;
1849 struct ieee80211_mgmt *resp;
1850 u8 *pos, *end;
1851
1852 if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1853 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1854 len < 24 + 2 || !ifsta->probe_resp)
1855 return;
1856
1857 if (local->ops->tx_last_beacon)
1858 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1859 else
1860 tx_last_beacon = 1;
1861
1862 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1863 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1864 " (tx_last_beacon=%d)\n",
1865 sdata->dev->name, mgmt->sa, mgmt->da,
1866 mgmt->bssid, tx_last_beacon);
1867 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1868
1869 if (!tx_last_beacon)
1870 return;
1871
1872 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1873 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1874 return;
1875
1876 end = ((u8 *) mgmt) + len;
1877 pos = mgmt->u.probe_req.variable;
1878 if (pos[0] != WLAN_EID_SSID ||
1879 pos + 2 + pos[1] > end) {
1880 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1881 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1882 "from %pM\n",
1883 sdata->dev->name, mgmt->sa);
1884 #endif
1885 return;
1886 }
1887 if (pos[1] != 0 &&
1888 (pos[1] != ifsta->ssid_len ||
1889 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1890 /* Ignore ProbeReq for foreign SSID */
1891 return;
1892 }
1893
1894 /* Reply with ProbeResp */
1895 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1896 if (!skb)
1897 return;
1898
1899 resp = (struct ieee80211_mgmt *) skb->data;
1900 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1901 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1902 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1903 sdata->dev->name, resp->da);
1904 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1905 ieee80211_tx_skb(sdata, skb, 0);
1906 }
1907
1908 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1909 struct ieee80211_rx_status *rx_status)
1910 {
1911 struct ieee80211_local *local = sdata->local;
1912 struct ieee80211_if_sta *ifsta;
1913 struct ieee80211_mgmt *mgmt;
1914 u16 fc;
1915
1916 if (skb->len < 24)
1917 goto fail;
1918
1919 ifsta = &sdata->u.sta;
1920
1921 mgmt = (struct ieee80211_mgmt *) skb->data;
1922 fc = le16_to_cpu(mgmt->frame_control);
1923
1924 switch (fc & IEEE80211_FCTL_STYPE) {
1925 case IEEE80211_STYPE_PROBE_REQ:
1926 case IEEE80211_STYPE_PROBE_RESP:
1927 case IEEE80211_STYPE_BEACON:
1928 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1929 case IEEE80211_STYPE_AUTH:
1930 case IEEE80211_STYPE_ASSOC_RESP:
1931 case IEEE80211_STYPE_REASSOC_RESP:
1932 case IEEE80211_STYPE_DEAUTH:
1933 case IEEE80211_STYPE_DISASSOC:
1934 skb_queue_tail(&ifsta->skb_queue, skb);
1935 queue_work(local->hw.workqueue, &ifsta->work);
1936 return;
1937 }
1938
1939 fail:
1940 kfree_skb(skb);
1941 }
1942
1943 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1944 struct sk_buff *skb)
1945 {
1946 struct ieee80211_rx_status *rx_status;
1947 struct ieee80211_if_sta *ifsta;
1948 struct ieee80211_mgmt *mgmt;
1949 u16 fc;
1950
1951 ifsta = &sdata->u.sta;
1952
1953 rx_status = (struct ieee80211_rx_status *) skb->cb;
1954 mgmt = (struct ieee80211_mgmt *) skb->data;
1955 fc = le16_to_cpu(mgmt->frame_control);
1956
1957 switch (fc & IEEE80211_FCTL_STYPE) {
1958 case IEEE80211_STYPE_PROBE_REQ:
1959 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
1960 break;
1961 case IEEE80211_STYPE_PROBE_RESP:
1962 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1963 break;
1964 case IEEE80211_STYPE_BEACON:
1965 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1966 break;
1967 case IEEE80211_STYPE_AUTH:
1968 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1969 break;
1970 case IEEE80211_STYPE_ASSOC_RESP:
1971 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1972 break;
1973 case IEEE80211_STYPE_REASSOC_RESP:
1974 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1975 break;
1976 case IEEE80211_STYPE_DEAUTH:
1977 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1978 break;
1979 case IEEE80211_STYPE_DISASSOC:
1980 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1981 break;
1982 }
1983
1984 kfree_skb(skb);
1985 }
1986
1987
1988 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1989 {
1990 struct ieee80211_local *local = sdata->local;
1991 int active = 0;
1992 struct sta_info *sta;
1993
1994 rcu_read_lock();
1995
1996 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1997 if (sta->sdata == sdata &&
1998 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1999 jiffies)) {
2000 active++;
2001 break;
2002 }
2003 }
2004
2005 rcu_read_unlock();
2006
2007 return active;
2008 }
2009
2010
2011 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2012 struct ieee80211_if_sta *ifsta)
2013 {
2014 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2015
2016 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2017 if (ieee80211_sta_active_ibss(sdata))
2018 return;
2019
2020 if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2021 (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2022 return;
2023
2024 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2025 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2026 ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
2027 }
2028
2029
2030 static void ieee80211_sta_timer(unsigned long data)
2031 {
2032 struct ieee80211_sub_if_data *sdata =
2033 (struct ieee80211_sub_if_data *) data;
2034 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2035 struct ieee80211_local *local = sdata->local;
2036
2037 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2038 queue_work(local->hw.workqueue, &ifsta->work);
2039 }
2040
2041 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2042 struct ieee80211_if_sta *ifsta)
2043 {
2044 struct ieee80211_local *local = sdata->local;
2045
2046 if (local->ops->reset_tsf) {
2047 /* Reset own TSF to allow time synchronization work. */
2048 local->ops->reset_tsf(local_to_hw(local));
2049 }
2050
2051 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2052
2053
2054 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2055 ifsta->auth_alg = WLAN_AUTH_OPEN;
2056 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2057 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2058 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2059 ifsta->auth_alg = WLAN_AUTH_LEAP;
2060 else
2061 ifsta->auth_alg = WLAN_AUTH_OPEN;
2062 ifsta->auth_transaction = -1;
2063 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2064 ifsta->assoc_scan_tries = 0;
2065 ifsta->direct_probe_tries = 0;
2066 ifsta->auth_tries = 0;
2067 ifsta->assoc_tries = 0;
2068 netif_tx_stop_all_queues(sdata->dev);
2069 netif_carrier_off(sdata->dev);
2070 }
2071
2072
2073 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2074 const char *ssid, int ssid_len)
2075 {
2076 int tmp, hidden_ssid;
2077
2078 if (ssid_len == ifsta->ssid_len &&
2079 !memcmp(ifsta->ssid, ssid, ssid_len))
2080 return 1;
2081
2082 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2083 return 0;
2084
2085 hidden_ssid = 1;
2086 tmp = ssid_len;
2087 while (tmp--) {
2088 if (ssid[tmp] != '\0') {
2089 hidden_ssid = 0;
2090 break;
2091 }
2092 }
2093
2094 if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2095 return 1;
2096
2097 if (ssid_len == 1 && ssid[0] == ' ')
2098 return 1;
2099
2100 return 0;
2101 }
2102
2103 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2104 struct ieee80211_if_sta *ifsta)
2105 {
2106 struct ieee80211_local *local = sdata->local;
2107 struct ieee80211_bss *bss;
2108 struct ieee80211_supported_band *sband;
2109 u8 bssid[ETH_ALEN], *pos;
2110 int i;
2111 int ret;
2112
2113 #if 0
2114 /* Easier testing, use fixed BSSID. */
2115 memset(bssid, 0xfe, ETH_ALEN);
2116 #else
2117 /* Generate random, not broadcast, locally administered BSSID. Mix in
2118 * own MAC address to make sure that devices that do not have proper
2119 * random number generator get different BSSID. */
2120 get_random_bytes(bssid, ETH_ALEN);
2121 for (i = 0; i < ETH_ALEN; i++)
2122 bssid[i] ^= sdata->dev->dev_addr[i];
2123 bssid[0] &= ~0x01;
2124 bssid[0] |= 0x02;
2125 #endif
2126
2127 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2128 sdata->dev->name, bssid);
2129
2130 bss = ieee80211_rx_bss_add(local, bssid,
2131 local->hw.conf.channel->center_freq,
2132 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2133 if (!bss)
2134 return -ENOMEM;
2135
2136 bss->band = local->hw.conf.channel->band;
2137 sband = local->hw.wiphy->bands[bss->band];
2138
2139 if (local->hw.conf.beacon_int == 0)
2140 local->hw.conf.beacon_int = 100;
2141 bss->beacon_int = local->hw.conf.beacon_int;
2142 bss->last_update = jiffies;
2143 bss->capability = WLAN_CAPABILITY_IBSS;
2144
2145 if (sdata->default_key)
2146 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2147 else
2148 sdata->drop_unencrypted = 0;
2149
2150 bss->supp_rates_len = sband->n_bitrates;
2151 pos = bss->supp_rates;
2152 for (i = 0; i < sband->n_bitrates; i++) {
2153 int rate = sband->bitrates[i].bitrate;
2154 *pos++ = (u8) (rate / 5);
2155 }
2156
2157 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2158 ieee80211_rx_bss_put(local, bss);
2159 return ret;
2160 }
2161
2162
2163 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2164 struct ieee80211_if_sta *ifsta)
2165 {
2166 struct ieee80211_local *local = sdata->local;
2167 struct ieee80211_bss *bss;
2168 int found = 0;
2169 u8 bssid[ETH_ALEN];
2170 int active_ibss;
2171
2172 if (ifsta->ssid_len == 0)
2173 return -EINVAL;
2174
2175 active_ibss = ieee80211_sta_active_ibss(sdata);
2176 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2177 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2178 sdata->dev->name, active_ibss);
2179 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2180 spin_lock_bh(&local->bss_lock);
2181 list_for_each_entry(bss, &local->bss_list, list) {
2182 if (ifsta->ssid_len != bss->ssid_len ||
2183 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2184 || !(bss->capability & WLAN_CAPABILITY_IBSS))
2185 continue;
2186 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2187 printk(KERN_DEBUG " bssid=%pM found\n", bss->bssid);
2188 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2189 memcpy(bssid, bss->bssid, ETH_ALEN);
2190 found = 1;
2191 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2192 break;
2193 }
2194 spin_unlock_bh(&local->bss_lock);
2195
2196 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2197 if (found)
2198 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
2199 "%pM\n", bssid, ifsta->bssid);
2200 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2201
2202 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2203 int ret;
2204 int search_freq;
2205
2206 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2207 search_freq = bss->freq;
2208 else
2209 search_freq = local->hw.conf.channel->center_freq;
2210
2211 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2212 ifsta->ssid, ifsta->ssid_len);
2213 if (!bss)
2214 goto dont_join;
2215
2216 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2217 " based on configured SSID\n",
2218 sdata->dev->name, bssid);
2219 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2220 ieee80211_rx_bss_put(local, bss);
2221 return ret;
2222 }
2223
2224 dont_join:
2225 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2226 printk(KERN_DEBUG " did not try to join ibss\n");
2227 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2228
2229 /* Selected IBSS not found in current scan results - try to scan */
2230 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2231 !ieee80211_sta_active_ibss(sdata)) {
2232 mod_timer(&ifsta->timer, jiffies +
2233 IEEE80211_IBSS_MERGE_INTERVAL);
2234 } else if (time_after(jiffies, local->last_scan_completed +
2235 IEEE80211_SCAN_INTERVAL)) {
2236 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2237 "join\n", sdata->dev->name);
2238 return ieee80211_request_scan(sdata, ifsta->ssid,
2239 ifsta->ssid_len);
2240 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2241 int interval = IEEE80211_SCAN_INTERVAL;
2242
2243 if (time_after(jiffies, ifsta->ibss_join_req +
2244 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2245 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2246 (!(local->oper_channel->flags &
2247 IEEE80211_CHAN_NO_IBSS)))
2248 return ieee80211_sta_create_ibss(sdata, ifsta);
2249 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2250 printk(KERN_DEBUG "%s: IBSS not allowed on"
2251 " %d MHz\n", sdata->dev->name,
2252 local->hw.conf.channel->center_freq);
2253 }
2254
2255 /* No IBSS found - decrease scan interval and continue
2256 * scanning. */
2257 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2258 }
2259
2260 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2261 mod_timer(&ifsta->timer, jiffies + interval);
2262 return 0;
2263 }
2264
2265 return 0;
2266 }
2267
2268
2269 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2270 struct ieee80211_if_sta *ifsta)
2271 {
2272 struct ieee80211_local *local = sdata->local;
2273 struct ieee80211_bss *bss, *selected = NULL;
2274 int top_rssi = 0, freq;
2275
2276 spin_lock_bh(&local->bss_lock);
2277 freq = local->oper_channel->center_freq;
2278 list_for_each_entry(bss, &local->bss_list, list) {
2279 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2280 continue;
2281
2282 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2283 IEEE80211_STA_AUTO_BSSID_SEL |
2284 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2285 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2286 !!sdata->default_key))
2287 continue;
2288
2289 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2290 bss->freq != freq)
2291 continue;
2292
2293 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2294 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2295 continue;
2296
2297 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2298 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2299 continue;
2300
2301 if (!selected || top_rssi < bss->signal) {
2302 selected = bss;
2303 top_rssi = bss->signal;
2304 }
2305 }
2306 if (selected)
2307 atomic_inc(&selected->users);
2308 spin_unlock_bh(&local->bss_lock);
2309
2310 if (selected) {
2311 ieee80211_set_freq(sdata, selected->freq);
2312 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2313 ieee80211_sta_set_ssid(sdata, selected->ssid,
2314 selected->ssid_len);
2315 ieee80211_sta_set_bssid(sdata, selected->bssid);
2316 ieee80211_sta_def_wmm_params(sdata, selected);
2317
2318 /* Send out direct probe if no probe resp was received or
2319 * the one we have is outdated
2320 */
2321 if (!selected->last_probe_resp ||
2322 time_after(jiffies, selected->last_probe_resp
2323 + IEEE80211_SCAN_RESULT_EXPIRE))
2324 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2325 else
2326 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2327
2328 ieee80211_rx_bss_put(local, selected);
2329 ieee80211_sta_reset_auth(sdata, ifsta);
2330 return 0;
2331 } else {
2332 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2333 ifsta->assoc_scan_tries++;
2334 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2335 ieee80211_start_scan(sdata, NULL, 0);
2336 else
2337 ieee80211_start_scan(sdata, ifsta->ssid,
2338 ifsta->ssid_len);
2339 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2340 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2341 } else
2342 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2343 }
2344 return -1;
2345 }
2346
2347
2348 static void ieee80211_sta_work(struct work_struct *work)
2349 {
2350 struct ieee80211_sub_if_data *sdata =
2351 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2352 struct ieee80211_local *local = sdata->local;
2353 struct ieee80211_if_sta *ifsta;
2354 struct sk_buff *skb;
2355
2356 if (!netif_running(sdata->dev))
2357 return;
2358
2359 if (local->sw_scanning || local->hw_scanning)
2360 return;
2361
2362 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2363 sdata->vif.type != NL80211_IFTYPE_ADHOC))
2364 return;
2365 ifsta = &sdata->u.sta;
2366
2367 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2368 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2369
2370 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2371 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2372 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2373 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2374 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2375 ifsta->scan_ssid_len);
2376 return;
2377 }
2378
2379 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2380 if (ieee80211_sta_config_auth(sdata, ifsta))
2381 return;
2382 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2383 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2384 return;
2385
2386 switch (ifsta->state) {
2387 case IEEE80211_STA_MLME_DISABLED:
2388 break;
2389 case IEEE80211_STA_MLME_DIRECT_PROBE:
2390 ieee80211_direct_probe(sdata, ifsta);
2391 break;
2392 case IEEE80211_STA_MLME_AUTHENTICATE:
2393 ieee80211_authenticate(sdata, ifsta);
2394 break;
2395 case IEEE80211_STA_MLME_ASSOCIATE:
2396 ieee80211_associate(sdata, ifsta);
2397 break;
2398 case IEEE80211_STA_MLME_ASSOCIATED:
2399 ieee80211_associated(sdata, ifsta);
2400 break;
2401 case IEEE80211_STA_MLME_IBSS_SEARCH:
2402 ieee80211_sta_find_ibss(sdata, ifsta);
2403 break;
2404 case IEEE80211_STA_MLME_IBSS_JOINED:
2405 ieee80211_sta_merge_ibss(sdata, ifsta);
2406 break;
2407 default:
2408 WARN_ON(1);
2409 break;
2410 }
2411
2412 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2413 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2414 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2415
2416 ieee80211_set_disassoc(sdata, ifsta, false, true,
2417 WLAN_REASON_UNSPECIFIED);
2418 }
2419 }
2420
2421 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2422 {
2423 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2424 queue_work(sdata->local->hw.workqueue,
2425 &sdata->u.sta.work);
2426 }
2427
2428 /* interface setup */
2429 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2430 {
2431 struct ieee80211_if_sta *ifsta;
2432
2433 ifsta = &sdata->u.sta;
2434 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2435 INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2436 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2437 (unsigned long) sdata);
2438 setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2439 (unsigned long) sdata);
2440 skb_queue_head_init(&ifsta->skb_queue);
2441
2442 ifsta->capab = WLAN_CAPABILITY_ESS;
2443 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2444 IEEE80211_AUTH_ALG_SHARED_KEY;
2445 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2446 IEEE80211_STA_AUTO_BSSID_SEL |
2447 IEEE80211_STA_AUTO_CHANNEL_SEL;
2448 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2449 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2450 }
2451
2452 /*
2453 * Add a new IBSS station, will also be called by the RX code when,
2454 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2455 * must be callable in atomic context.
2456 */
2457 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2458 u8 *bssid,u8 *addr, u64 supp_rates)
2459 {
2460 struct ieee80211_local *local = sdata->local;
2461 struct sta_info *sta;
2462 int band = local->hw.conf.channel->band;
2463
2464 /* TODO: Could consider removing the least recently used entry and
2465 * allow new one to be added. */
2466 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2467 if (net_ratelimit()) {
2468 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2469 "entry %pM\n", sdata->dev->name, addr);
2470 }
2471 return NULL;
2472 }
2473
2474 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2475 return NULL;
2476
2477 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2478 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2479 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2480 #endif
2481
2482 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2483 if (!sta)
2484 return NULL;
2485
2486 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2487
2488 /* make sure mandatory rates are always added */
2489 sta->sta.supp_rates[band] = supp_rates |
2490 ieee80211_mandatory_rates(local, band);
2491
2492 rate_control_rate_init(sta);
2493
2494 if (sta_info_insert(sta))
2495 return NULL;
2496
2497 return sta;
2498 }
2499
2500 /* configuration hooks */
2501 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2502 struct ieee80211_if_sta *ifsta)
2503 {
2504 struct ieee80211_local *local = sdata->local;
2505
2506 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2507 return;
2508
2509 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2510 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2511 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2512 IEEE80211_STA_AUTO_SSID_SEL))) {
2513
2514 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2515 ieee80211_set_disassoc(sdata, ifsta, true, true,
2516 WLAN_REASON_DEAUTH_LEAVING);
2517
2518 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2519 queue_work(local->hw.workqueue, &ifsta->work);
2520 }
2521 }
2522
2523 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2524 {
2525 struct ieee80211_if_sta *ifsta;
2526
2527 if (len > IEEE80211_MAX_SSID_LEN)
2528 return -EINVAL;
2529
2530 ifsta = &sdata->u.sta;
2531
2532 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2533 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2534 memcpy(ifsta->ssid, ssid, len);
2535 ifsta->ssid_len = len;
2536 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2537 }
2538
2539 if (len)
2540 ifsta->flags |= IEEE80211_STA_SSID_SET;
2541 else
2542 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2543
2544 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2545 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2546 ifsta->ibss_join_req = jiffies;
2547 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2548 return ieee80211_sta_find_ibss(sdata, ifsta);
2549 }
2550
2551 return 0;
2552 }
2553
2554 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2555 {
2556 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2557 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2558 *len = ifsta->ssid_len;
2559 return 0;
2560 }
2561
2562 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2563 {
2564 struct ieee80211_if_sta *ifsta;
2565 int res;
2566 bool valid;
2567
2568 ifsta = &sdata->u.sta;
2569 valid = is_valid_ether_addr(bssid);
2570
2571 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2572 if(valid)
2573 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2574 else
2575 memset(ifsta->bssid, 0, ETH_ALEN);
2576 res = 0;
2577 /*
2578 * Hack! See also ieee80211_sta_set_ssid.
2579 */
2580 if (netif_running(sdata->dev))
2581 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2582 if (res) {
2583 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2584 "the low-level driver\n", sdata->dev->name);
2585 return res;
2586 }
2587 }
2588
2589 if (valid)
2590 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2591 else
2592 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2593
2594 return 0;
2595 }
2596
2597 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2598 {
2599 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2600
2601 kfree(ifsta->extra_ie);
2602 if (len == 0) {
2603 ifsta->extra_ie = NULL;
2604 ifsta->extra_ie_len = 0;
2605 return 0;
2606 }
2607 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2608 if (!ifsta->extra_ie) {
2609 ifsta->extra_ie_len = 0;
2610 return -ENOMEM;
2611 }
2612 memcpy(ifsta->extra_ie, ie, len);
2613 ifsta->extra_ie_len = len;
2614 return 0;
2615 }
2616
2617 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2618 {
2619 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2620
2621 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2622 sdata->dev->name, reason);
2623
2624 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2625 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2626 return -EINVAL;
2627
2628 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2629 return 0;
2630 }
2631
2632 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2633 {
2634 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2635
2636 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2637 sdata->dev->name, reason);
2638
2639 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2640 return -EINVAL;
2641
2642 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2643 return -1;
2644
2645 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2646 return 0;
2647 }
2648
2649 /* scan finished notification */
2650 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2651 {
2652 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2653 struct ieee80211_if_sta *ifsta;
2654
2655 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2656 ifsta = &sdata->u.sta;
2657 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2658 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2659 !ieee80211_sta_active_ibss(sdata)))
2660 ieee80211_sta_find_ibss(sdata, ifsta);
2661 }
2662
2663 /* Restart STA timers */
2664 rcu_read_lock();
2665 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2666 ieee80211_restart_sta_timer(sdata);
2667 rcu_read_unlock();
2668 }
2669
2670 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2671 {
2672 struct ieee80211_local *local =
2673 container_of(work, struct ieee80211_local,
2674 dynamic_ps_disable_work);
2675
2676 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2677 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2678 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2679 }
2680
2681 ieee80211_wake_queues_by_reason(&local->hw,
2682 IEEE80211_QUEUE_STOP_REASON_PS);
2683 }
2684
2685 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2686 {
2687 struct ieee80211_local *local =
2688 container_of(work, struct ieee80211_local,
2689 dynamic_ps_enable_work);
2690 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2691
2692 if (local->hw.conf.flags & IEEE80211_CONF_PS)
2693 return;
2694
2695 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2696 ieee80211_send_nullfunc(local, sdata, 1);
2697
2698 local->hw.conf.flags |= IEEE80211_CONF_PS;
2699 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2700 }
2701
2702 void ieee80211_dynamic_ps_timer(unsigned long data)
2703 {
2704 struct ieee80211_local *local = (void *) data;
2705
2706 queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2707 }
Linux kernel - Deliverables
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