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cfg80211/nl80211: scanning (and mac80211 update to use it)
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/wireless.h>
19 #include <linux/random.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/iw_handler.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
32 #define IEEE80211_AUTH_MAX_TRIES 3
33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
34 #define IEEE80211_ASSOC_MAX_TRIES 3
35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
36 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
38 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
41
42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
44
45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
46
47
48 /* utils */
49 static int ecw2cw(int ecw)
50 {
51 return (1 << ecw) - 1;
52 }
53
54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
55 {
56 u8 *end, *pos;
57
58 pos = bss->ies;
59 if (pos == NULL)
60 return NULL;
61 end = pos + bss->ies_len;
62
63 while (pos + 1 < end) {
64 if (pos + 2 + pos[1] > end)
65 break;
66 if (pos[0] == ie)
67 return pos;
68 pos += 2 + pos[1];
69 }
70
71 return NULL;
72 }
73
74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
75 struct ieee80211_supported_band *sband,
76 u32 *rates)
77 {
78 int i, j, count;
79 *rates = 0;
80 count = 0;
81 for (i = 0; i < bss->supp_rates_len; i++) {
82 int rate = (bss->supp_rates[i] & 0x7F) * 5;
83
84 for (j = 0; j < sband->n_bitrates; j++)
85 if (sband->bitrates[j].bitrate == rate) {
86 *rates |= BIT(j);
87 count++;
88 break;
89 }
90 }
91
92 return count;
93 }
94
95 /* also used by mesh code */
96 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
97 struct ieee802_11_elems *elems,
98 enum ieee80211_band band)
99 {
100 struct ieee80211_supported_band *sband;
101 struct ieee80211_rate *bitrates;
102 size_t num_rates;
103 u32 supp_rates;
104 int i, j;
105 sband = local->hw.wiphy->bands[band];
106
107 if (!sband) {
108 WARN_ON(1);
109 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
110 }
111
112 bitrates = sband->bitrates;
113 num_rates = sband->n_bitrates;
114 supp_rates = 0;
115 for (i = 0; i < elems->supp_rates_len +
116 elems->ext_supp_rates_len; i++) {
117 u8 rate = 0;
118 int own_rate;
119 if (i < elems->supp_rates_len)
120 rate = elems->supp_rates[i];
121 else if (elems->ext_supp_rates)
122 rate = elems->ext_supp_rates
123 [i - elems->supp_rates_len];
124 own_rate = 5 * (rate & 0x7f);
125 for (j = 0; j < num_rates; j++)
126 if (bitrates[j].bitrate == own_rate)
127 supp_rates |= BIT(j);
128 }
129 return supp_rates;
130 }
131
132 /* frame sending functions */
133
134 static void add_extra_ies(struct sk_buff *skb, u8 *ies, size_t ies_len)
135 {
136 if (ies)
137 memcpy(skb_put(skb, ies_len), ies, ies_len);
138 }
139
140 /* also used by scanning code */
141 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
142 u8 *ssid, size_t ssid_len)
143 {
144 struct ieee80211_local *local = sdata->local;
145 struct ieee80211_supported_band *sband;
146 struct sk_buff *skb;
147 struct ieee80211_mgmt *mgmt;
148 u8 *pos, *supp_rates, *esupp_rates = NULL;
149 int i;
150
151 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
152 sdata->u.sta.ie_probereq_len);
153 if (!skb) {
154 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
155 "request\n", sdata->dev->name);
156 return;
157 }
158 skb_reserve(skb, local->hw.extra_tx_headroom);
159
160 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
161 memset(mgmt, 0, 24);
162 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
163 IEEE80211_STYPE_PROBE_REQ);
164 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
165 if (dst) {
166 memcpy(mgmt->da, dst, ETH_ALEN);
167 memcpy(mgmt->bssid, dst, ETH_ALEN);
168 } else {
169 memset(mgmt->da, 0xff, ETH_ALEN);
170 memset(mgmt->bssid, 0xff, ETH_ALEN);
171 }
172 pos = skb_put(skb, 2 + ssid_len);
173 *pos++ = WLAN_EID_SSID;
174 *pos++ = ssid_len;
175 memcpy(pos, ssid, ssid_len);
176
177 supp_rates = skb_put(skb, 2);
178 supp_rates[0] = WLAN_EID_SUPP_RATES;
179 supp_rates[1] = 0;
180 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
181
182 for (i = 0; i < sband->n_bitrates; i++) {
183 struct ieee80211_rate *rate = &sband->bitrates[i];
184 if (esupp_rates) {
185 pos = skb_put(skb, 1);
186 esupp_rates[1]++;
187 } else if (supp_rates[1] == 8) {
188 esupp_rates = skb_put(skb, 3);
189 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
190 esupp_rates[1] = 1;
191 pos = &esupp_rates[2];
192 } else {
193 pos = skb_put(skb, 1);
194 supp_rates[1]++;
195 }
196 *pos = rate->bitrate / 5;
197 }
198
199 add_extra_ies(skb, sdata->u.sta.ie_probereq,
200 sdata->u.sta.ie_probereq_len);
201
202 ieee80211_tx_skb(sdata, skb, 0);
203 }
204
205 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
206 struct ieee80211_if_sta *ifsta,
207 int transaction, u8 *extra, size_t extra_len,
208 int encrypt)
209 {
210 struct ieee80211_local *local = sdata->local;
211 struct sk_buff *skb;
212 struct ieee80211_mgmt *mgmt;
213
214 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
215 sizeof(*mgmt) + 6 + extra_len +
216 sdata->u.sta.ie_auth_len);
217 if (!skb) {
218 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
219 "frame\n", sdata->dev->name);
220 return;
221 }
222 skb_reserve(skb, local->hw.extra_tx_headroom);
223
224 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
225 memset(mgmt, 0, 24 + 6);
226 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
227 IEEE80211_STYPE_AUTH);
228 if (encrypt)
229 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
230 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
231 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
232 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
233 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
234 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
235 ifsta->auth_transaction = transaction + 1;
236 mgmt->u.auth.status_code = cpu_to_le16(0);
237 if (extra)
238 memcpy(skb_put(skb, extra_len), extra, extra_len);
239 add_extra_ies(skb, sdata->u.sta.ie_auth, sdata->u.sta.ie_auth_len);
240
241 ieee80211_tx_skb(sdata, skb, encrypt);
242 }
243
244 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
245 struct ieee80211_if_sta *ifsta)
246 {
247 struct ieee80211_local *local = sdata->local;
248 struct sk_buff *skb;
249 struct ieee80211_mgmt *mgmt;
250 u8 *pos, *ies, *ht_ie, *e_ies;
251 int i, len, count, rates_len, supp_rates_len;
252 u16 capab;
253 struct ieee80211_bss *bss;
254 int wmm = 0;
255 struct ieee80211_supported_band *sband;
256 u32 rates = 0;
257 size_t e_ies_len;
258
259 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
260 e_ies = sdata->u.sta.ie_reassocreq;
261 e_ies_len = sdata->u.sta.ie_reassocreq_len;
262 } else {
263 e_ies = sdata->u.sta.ie_assocreq;
264 e_ies_len = sdata->u.sta.ie_assocreq_len;
265 }
266
267 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
268 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
269 ifsta->ssid_len + e_ies_len);
270 if (!skb) {
271 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
272 "frame\n", sdata->dev->name);
273 return;
274 }
275 skb_reserve(skb, local->hw.extra_tx_headroom);
276
277 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
278
279 capab = ifsta->capab;
280
281 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
282 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
283 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
284 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
285 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
286 }
287
288 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
289 local->hw.conf.channel->center_freq,
290 ifsta->ssid, ifsta->ssid_len);
291 if (bss) {
292 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
293 capab |= WLAN_CAPABILITY_PRIVACY;
294 if (bss->wmm_used)
295 wmm = 1;
296
297 /* get all rates supported by the device and the AP as
298 * some APs don't like getting a superset of their rates
299 * in the association request (e.g. D-Link DAP 1353 in
300 * b-only mode) */
301 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
302
303 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
304 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
305 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
306
307 ieee80211_rx_bss_put(local, bss);
308 } else {
309 rates = ~0;
310 rates_len = sband->n_bitrates;
311 }
312
313 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
314 memset(mgmt, 0, 24);
315 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
316 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
317 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
318
319 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
320 skb_put(skb, 10);
321 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
322 IEEE80211_STYPE_REASSOC_REQ);
323 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
324 mgmt->u.reassoc_req.listen_interval =
325 cpu_to_le16(local->hw.conf.listen_interval);
326 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
327 ETH_ALEN);
328 } else {
329 skb_put(skb, 4);
330 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
331 IEEE80211_STYPE_ASSOC_REQ);
332 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
333 mgmt->u.assoc_req.listen_interval =
334 cpu_to_le16(local->hw.conf.listen_interval);
335 }
336
337 /* SSID */
338 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
339 *pos++ = WLAN_EID_SSID;
340 *pos++ = ifsta->ssid_len;
341 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
342
343 /* add all rates which were marked to be used above */
344 supp_rates_len = rates_len;
345 if (supp_rates_len > 8)
346 supp_rates_len = 8;
347
348 len = sband->n_bitrates;
349 pos = skb_put(skb, supp_rates_len + 2);
350 *pos++ = WLAN_EID_SUPP_RATES;
351 *pos++ = supp_rates_len;
352
353 count = 0;
354 for (i = 0; i < sband->n_bitrates; i++) {
355 if (BIT(i) & rates) {
356 int rate = sband->bitrates[i].bitrate;
357 *pos++ = (u8) (rate / 5);
358 if (++count == 8)
359 break;
360 }
361 }
362
363 if (rates_len > count) {
364 pos = skb_put(skb, rates_len - count + 2);
365 *pos++ = WLAN_EID_EXT_SUPP_RATES;
366 *pos++ = rates_len - count;
367
368 for (i++; i < sband->n_bitrates; i++) {
369 if (BIT(i) & rates) {
370 int rate = sband->bitrates[i].bitrate;
371 *pos++ = (u8) (rate / 5);
372 }
373 }
374 }
375
376 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
377 /* 1. power capabilities */
378 pos = skb_put(skb, 4);
379 *pos++ = WLAN_EID_PWR_CAPABILITY;
380 *pos++ = 2;
381 *pos++ = 0; /* min tx power */
382 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
383
384 /* 2. supported channels */
385 /* TODO: get this in reg domain format */
386 pos = skb_put(skb, 2 * sband->n_channels + 2);
387 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
388 *pos++ = 2 * sband->n_channels;
389 for (i = 0; i < sband->n_channels; i++) {
390 *pos++ = ieee80211_frequency_to_channel(
391 sband->channels[i].center_freq);
392 *pos++ = 1; /* one channel in the subband*/
393 }
394 }
395
396 if (ifsta->extra_ie) {
397 pos = skb_put(skb, ifsta->extra_ie_len);
398 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
399 }
400
401 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
402 pos = skb_put(skb, 9);
403 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
404 *pos++ = 7; /* len */
405 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
406 *pos++ = 0x50;
407 *pos++ = 0xf2;
408 *pos++ = 2; /* WME */
409 *pos++ = 0; /* WME info */
410 *pos++ = 1; /* WME ver */
411 *pos++ = 0;
412 }
413
414 /* wmm support is a must to HT */
415 /*
416 * IEEE802.11n does not allow TKIP/WEP as pairwise
417 * ciphers in HT mode. We still associate in non-ht
418 * mode (11a/b/g) if any one of these ciphers is
419 * configured as pairwise.
420 */
421 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
422 sband->ht_cap.ht_supported &&
423 (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
424 ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
425 (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
426 struct ieee80211_ht_info *ht_info =
427 (struct ieee80211_ht_info *)(ht_ie + 2);
428 u16 cap = sband->ht_cap.cap;
429 __le16 tmp;
430 u32 flags = local->hw.conf.channel->flags;
431
432 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
433 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
434 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
435 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
436 cap &= ~IEEE80211_HT_CAP_SGI_40;
437 }
438 break;
439 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
440 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
441 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
442 cap &= ~IEEE80211_HT_CAP_SGI_40;
443 }
444 break;
445 }
446
447 tmp = cpu_to_le16(cap);
448 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
449 *pos++ = WLAN_EID_HT_CAPABILITY;
450 *pos++ = sizeof(struct ieee80211_ht_cap);
451 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
452 memcpy(pos, &tmp, sizeof(u16));
453 pos += sizeof(u16);
454 /* TODO: needs a define here for << 2 */
455 *pos++ = sband->ht_cap.ampdu_factor |
456 (sband->ht_cap.ampdu_density << 2);
457 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
458 }
459
460 add_extra_ies(skb, e_ies, e_ies_len);
461
462 kfree(ifsta->assocreq_ies);
463 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
464 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
465 if (ifsta->assocreq_ies)
466 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
467
468 ieee80211_tx_skb(sdata, skb, 0);
469 }
470
471
472 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
473 u16 stype, u16 reason)
474 {
475 struct ieee80211_local *local = sdata->local;
476 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
477 struct sk_buff *skb;
478 struct ieee80211_mgmt *mgmt;
479 u8 *ies;
480 size_t ies_len;
481
482 if (stype == IEEE80211_STYPE_DEAUTH) {
483 ies = sdata->u.sta.ie_deauth;
484 ies_len = sdata->u.sta.ie_deauth_len;
485 } else {
486 ies = sdata->u.sta.ie_disassoc;
487 ies_len = sdata->u.sta.ie_disassoc_len;
488 }
489
490 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) +
491 ies_len);
492 if (!skb) {
493 printk(KERN_DEBUG "%s: failed to allocate buffer for "
494 "deauth/disassoc frame\n", sdata->dev->name);
495 return;
496 }
497 skb_reserve(skb, local->hw.extra_tx_headroom);
498
499 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
500 memset(mgmt, 0, 24);
501 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
502 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
503 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
504 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
505 skb_put(skb, 2);
506 /* u.deauth.reason_code == u.disassoc.reason_code */
507 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
508
509 add_extra_ies(skb, ies, ies_len);
510
511 ieee80211_tx_skb(sdata, skb, ifsta->flags & IEEE80211_STA_MFP_ENABLED);
512 }
513
514 void ieee80211_send_pspoll(struct ieee80211_local *local,
515 struct ieee80211_sub_if_data *sdata)
516 {
517 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
518 struct ieee80211_pspoll *pspoll;
519 struct sk_buff *skb;
520 u16 fc;
521
522 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
523 if (!skb) {
524 printk(KERN_DEBUG "%s: failed to allocate buffer for "
525 "pspoll frame\n", sdata->dev->name);
526 return;
527 }
528 skb_reserve(skb, local->hw.extra_tx_headroom);
529
530 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
531 memset(pspoll, 0, sizeof(*pspoll));
532 fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
533 pspoll->frame_control = cpu_to_le16(fc);
534 pspoll->aid = cpu_to_le16(ifsta->aid);
535
536 /* aid in PS-Poll has its two MSBs each set to 1 */
537 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
538
539 memcpy(pspoll->bssid, ifsta->bssid, ETH_ALEN);
540 memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
541
542 ieee80211_tx_skb(sdata, skb, 0);
543
544 return;
545 }
546
547 /* MLME */
548 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
549 struct ieee80211_bss *bss)
550 {
551 struct ieee80211_local *local = sdata->local;
552 int i, have_higher_than_11mbit = 0;
553
554 /* cf. IEEE 802.11 9.2.12 */
555 for (i = 0; i < bss->supp_rates_len; i++)
556 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
557 have_higher_than_11mbit = 1;
558
559 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
560 have_higher_than_11mbit)
561 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
562 else
563 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
564
565 ieee80211_set_wmm_default(sdata);
566 }
567
568 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
569 struct ieee80211_if_sta *ifsta,
570 u8 *wmm_param, size_t wmm_param_len)
571 {
572 struct ieee80211_tx_queue_params params;
573 size_t left;
574 int count;
575 u8 *pos;
576
577 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
578 return;
579
580 if (!wmm_param)
581 return;
582
583 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
584 return;
585 count = wmm_param[6] & 0x0f;
586 if (count == ifsta->wmm_last_param_set)
587 return;
588 ifsta->wmm_last_param_set = count;
589
590 pos = wmm_param + 8;
591 left = wmm_param_len - 8;
592
593 memset(&params, 0, sizeof(params));
594
595 if (!local->ops->conf_tx)
596 return;
597
598 local->wmm_acm = 0;
599 for (; left >= 4; left -= 4, pos += 4) {
600 int aci = (pos[0] >> 5) & 0x03;
601 int acm = (pos[0] >> 4) & 0x01;
602 int queue;
603
604 switch (aci) {
605 case 1:
606 queue = 3;
607 if (acm)
608 local->wmm_acm |= BIT(0) | BIT(3);
609 break;
610 case 2:
611 queue = 1;
612 if (acm)
613 local->wmm_acm |= BIT(4) | BIT(5);
614 break;
615 case 3:
616 queue = 0;
617 if (acm)
618 local->wmm_acm |= BIT(6) | BIT(7);
619 break;
620 case 0:
621 default:
622 queue = 2;
623 if (acm)
624 local->wmm_acm |= BIT(1) | BIT(2);
625 break;
626 }
627
628 params.aifs = pos[0] & 0x0f;
629 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
630 params.cw_min = ecw2cw(pos[1] & 0x0f);
631 params.txop = get_unaligned_le16(pos + 2);
632 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
633 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
634 "cWmin=%d cWmax=%d txop=%d\n",
635 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
636 params.cw_max, params.txop);
637 #endif
638 /* TODO: handle ACM (block TX, fallback to next lowest allowed
639 * AC for now) */
640 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
641 printk(KERN_DEBUG "%s: failed to set TX queue "
642 "parameters for queue %d\n", local->mdev->name, queue);
643 }
644 }
645 }
646
647 static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
648 {
649 u8 mask;
650 u8 index, indexn1, indexn2;
651 struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
652
653 aid &= 0x3fff;
654 index = aid / 8;
655 mask = 1 << (aid & 7);
656
657 indexn1 = tim->bitmap_ctrl & 0xfe;
658 indexn2 = elems->tim_len + indexn1 - 4;
659
660 if (index < indexn1 || index > indexn2)
661 return false;
662
663 index -= indexn1;
664
665 return !!(tim->virtual_map[index] & mask);
666 }
667
668 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
669 u16 capab, bool erp_valid, u8 erp)
670 {
671 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
672 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
673 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
674 #endif
675 u32 changed = 0;
676 bool use_protection;
677 bool use_short_preamble;
678 bool use_short_slot;
679
680 if (erp_valid) {
681 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
682 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
683 } else {
684 use_protection = false;
685 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
686 }
687
688 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
689
690 if (use_protection != bss_conf->use_cts_prot) {
691 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
692 if (net_ratelimit()) {
693 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
694 sdata->dev->name,
695 use_protection ? "enabled" : "disabled",
696 ifsta->bssid);
697 }
698 #endif
699 bss_conf->use_cts_prot = use_protection;
700 changed |= BSS_CHANGED_ERP_CTS_PROT;
701 }
702
703 if (use_short_preamble != bss_conf->use_short_preamble) {
704 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
705 if (net_ratelimit()) {
706 printk(KERN_DEBUG "%s: switched to %s barker preamble"
707 " (BSSID=%pM)\n",
708 sdata->dev->name,
709 use_short_preamble ? "short" : "long",
710 ifsta->bssid);
711 }
712 #endif
713 bss_conf->use_short_preamble = use_short_preamble;
714 changed |= BSS_CHANGED_ERP_PREAMBLE;
715 }
716
717 if (use_short_slot != bss_conf->use_short_slot) {
718 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
719 if (net_ratelimit()) {
720 printk(KERN_DEBUG "%s: switched to %s slot time"
721 " (BSSID=%pM)\n",
722 sdata->dev->name,
723 use_short_slot ? "short" : "long",
724 ifsta->bssid);
725 }
726 #endif
727 bss_conf->use_short_slot = use_short_slot;
728 changed |= BSS_CHANGED_ERP_SLOT;
729 }
730
731 return changed;
732 }
733
734 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
735 struct ieee80211_if_sta *ifsta)
736 {
737 union iwreq_data wrqu;
738 memset(&wrqu, 0, sizeof(wrqu));
739 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
740 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
741 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
742 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
743 }
744
745 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
746 struct ieee80211_if_sta *ifsta)
747 {
748 char *buf;
749 size_t len;
750 int i;
751 union iwreq_data wrqu;
752
753 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
754 return;
755
756 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
757 ifsta->assocresp_ies_len), GFP_KERNEL);
758 if (!buf)
759 return;
760
761 len = sprintf(buf, "ASSOCINFO(");
762 if (ifsta->assocreq_ies) {
763 len += sprintf(buf + len, "ReqIEs=");
764 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
765 len += sprintf(buf + len, "%02x",
766 ifsta->assocreq_ies[i]);
767 }
768 }
769 if (ifsta->assocresp_ies) {
770 if (ifsta->assocreq_ies)
771 len += sprintf(buf + len, " ");
772 len += sprintf(buf + len, "RespIEs=");
773 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
774 len += sprintf(buf + len, "%02x",
775 ifsta->assocresp_ies[i]);
776 }
777 }
778 len += sprintf(buf + len, ")");
779
780 if (len > IW_CUSTOM_MAX) {
781 len = sprintf(buf, "ASSOCRESPIE=");
782 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
783 len += sprintf(buf + len, "%02x",
784 ifsta->assocresp_ies[i]);
785 }
786 }
787
788 if (len <= IW_CUSTOM_MAX) {
789 memset(&wrqu, 0, sizeof(wrqu));
790 wrqu.data.length = len;
791 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
792 }
793
794 kfree(buf);
795 }
796
797
798 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
799 struct ieee80211_if_sta *ifsta,
800 u32 bss_info_changed)
801 {
802 struct ieee80211_local *local = sdata->local;
803 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
804
805 struct ieee80211_bss *bss;
806
807 bss_info_changed |= BSS_CHANGED_ASSOC;
808 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
809
810 if (sdata->vif.type != NL80211_IFTYPE_STATION)
811 return;
812
813 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
814 conf->channel->center_freq,
815 ifsta->ssid, ifsta->ssid_len);
816 if (bss) {
817 /* set timing information */
818 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
819 sdata->vif.bss_conf.timestamp = bss->timestamp;
820 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
821
822 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
823 bss->capability, bss->has_erp_value, bss->erp_value);
824
825 ieee80211_rx_bss_put(local, bss);
826 }
827
828 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
829 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
830 ieee80211_sta_send_associnfo(sdata, ifsta);
831
832 ifsta->last_probe = jiffies;
833 ieee80211_led_assoc(local, 1);
834
835 sdata->vif.bss_conf.assoc = 1;
836 /*
837 * For now just always ask the driver to update the basic rateset
838 * when we have associated, we aren't checking whether it actually
839 * changed or not.
840 */
841 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
842 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
843
844 if (local->powersave) {
845 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
846 local->hw.conf.dynamic_ps_timeout > 0) {
847 mod_timer(&local->dynamic_ps_timer, jiffies +
848 msecs_to_jiffies(
849 local->hw.conf.dynamic_ps_timeout));
850 } else {
851 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
852 ieee80211_send_nullfunc(local, sdata, 1);
853 conf->flags |= IEEE80211_CONF_PS;
854 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
855 }
856 }
857
858 netif_tx_start_all_queues(sdata->dev);
859 netif_carrier_on(sdata->dev);
860
861 ieee80211_sta_send_apinfo(sdata, ifsta);
862 }
863
864 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
865 struct ieee80211_if_sta *ifsta)
866 {
867 ifsta->direct_probe_tries++;
868 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
869 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
870 sdata->dev->name, ifsta->bssid);
871 ifsta->state = IEEE80211_STA_MLME_DISABLED;
872 ieee80211_sta_send_apinfo(sdata, ifsta);
873
874 /*
875 * Most likely AP is not in the range so remove the
876 * bss information associated to the AP
877 */
878 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
879 sdata->local->hw.conf.channel->center_freq,
880 ifsta->ssid, ifsta->ssid_len);
881 return;
882 }
883
884 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
885 sdata->dev->name, ifsta->bssid,
886 ifsta->direct_probe_tries);
887
888 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
889
890 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
891
892 /* Direct probe is sent to broadcast address as some APs
893 * will not answer to direct packet in unassociated state.
894 */
895 ieee80211_send_probe_req(sdata, NULL,
896 ifsta->ssid, ifsta->ssid_len);
897
898 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
899 }
900
901
902 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
903 struct ieee80211_if_sta *ifsta)
904 {
905 ifsta->auth_tries++;
906 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
907 printk(KERN_DEBUG "%s: authentication with AP %pM"
908 " timed out\n",
909 sdata->dev->name, ifsta->bssid);
910 ifsta->state = IEEE80211_STA_MLME_DISABLED;
911 ieee80211_sta_send_apinfo(sdata, ifsta);
912 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
913 sdata->local->hw.conf.channel->center_freq,
914 ifsta->ssid, ifsta->ssid_len);
915 return;
916 }
917
918 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
919 printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
920 sdata->dev->name, ifsta->bssid);
921
922 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
923
924 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
925 }
926
927 /*
928 * The disassoc 'reason' argument can be either our own reason
929 * if self disconnected or a reason code from the AP.
930 */
931 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
932 struct ieee80211_if_sta *ifsta, bool deauth,
933 bool self_disconnected, u16 reason)
934 {
935 struct ieee80211_local *local = sdata->local;
936 struct sta_info *sta;
937 u32 changed = 0, config_changed = 0;
938
939 rcu_read_lock();
940
941 sta = sta_info_get(local, ifsta->bssid);
942 if (!sta) {
943 rcu_read_unlock();
944 return;
945 }
946
947 if (deauth) {
948 ifsta->direct_probe_tries = 0;
949 ifsta->auth_tries = 0;
950 }
951 ifsta->assoc_scan_tries = 0;
952 ifsta->assoc_tries = 0;
953
954 netif_tx_stop_all_queues(sdata->dev);
955 netif_carrier_off(sdata->dev);
956
957 ieee80211_sta_tear_down_BA_sessions(sta);
958
959 if (self_disconnected) {
960 if (deauth)
961 ieee80211_send_deauth_disassoc(sdata,
962 IEEE80211_STYPE_DEAUTH, reason);
963 else
964 ieee80211_send_deauth_disassoc(sdata,
965 IEEE80211_STYPE_DISASSOC, reason);
966 }
967
968 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
969 changed |= ieee80211_reset_erp_info(sdata);
970
971 ieee80211_led_assoc(local, 0);
972 changed |= BSS_CHANGED_ASSOC;
973 sdata->vif.bss_conf.assoc = false;
974
975 ieee80211_sta_send_apinfo(sdata, ifsta);
976
977 if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
978 ifsta->state = IEEE80211_STA_MLME_DISABLED;
979 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
980 sdata->local->hw.conf.channel->center_freq,
981 ifsta->ssid, ifsta->ssid_len);
982 }
983
984 rcu_read_unlock();
985
986 /* channel(_type) changes are handled by ieee80211_hw_config */
987 local->oper_channel_type = NL80211_CHAN_NO_HT;
988
989 local->power_constr_level = 0;
990
991 del_timer_sync(&local->dynamic_ps_timer);
992 cancel_work_sync(&local->dynamic_ps_enable_work);
993
994 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
995 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
996 config_changed |= IEEE80211_CONF_CHANGE_PS;
997 }
998
999 ieee80211_hw_config(local, config_changed);
1000 ieee80211_bss_info_change_notify(sdata, changed);
1001
1002 rcu_read_lock();
1003
1004 sta = sta_info_get(local, ifsta->bssid);
1005 if (!sta) {
1006 rcu_read_unlock();
1007 return;
1008 }
1009
1010 sta_info_unlink(&sta);
1011
1012 rcu_read_unlock();
1013
1014 sta_info_destroy(sta);
1015 }
1016
1017 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1018 {
1019 if (!sdata || !sdata->default_key ||
1020 sdata->default_key->conf.alg != ALG_WEP)
1021 return 0;
1022 return 1;
1023 }
1024
1025 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
1026 struct ieee80211_if_sta *ifsta)
1027 {
1028 struct ieee80211_local *local = sdata->local;
1029 struct ieee80211_bss *bss;
1030 int bss_privacy;
1031 int wep_privacy;
1032 int privacy_invoked;
1033
1034 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
1035 return 0;
1036
1037 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1038 local->hw.conf.channel->center_freq,
1039 ifsta->ssid, ifsta->ssid_len);
1040 if (!bss)
1041 return 0;
1042
1043 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
1044 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1045 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
1046
1047 ieee80211_rx_bss_put(local, bss);
1048
1049 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1050 return 0;
1051
1052 return 1;
1053 }
1054
1055 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1056 struct ieee80211_if_sta *ifsta)
1057 {
1058 ifsta->assoc_tries++;
1059 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1060 printk(KERN_DEBUG "%s: association with AP %pM"
1061 " timed out\n",
1062 sdata->dev->name, ifsta->bssid);
1063 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1064 ieee80211_sta_send_apinfo(sdata, ifsta);
1065 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
1066 sdata->local->hw.conf.channel->center_freq,
1067 ifsta->ssid, ifsta->ssid_len);
1068 return;
1069 }
1070
1071 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1072 printk(KERN_DEBUG "%s: associate with AP %pM\n",
1073 sdata->dev->name, ifsta->bssid);
1074 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1075 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1076 "mixed-cell disabled - abort association\n", sdata->dev->name);
1077 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1078 return;
1079 }
1080
1081 ieee80211_send_assoc(sdata, ifsta);
1082
1083 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1084 }
1085
1086
1087 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1088 struct ieee80211_if_sta *ifsta)
1089 {
1090 struct ieee80211_local *local = sdata->local;
1091 struct sta_info *sta;
1092 int disassoc;
1093
1094 /* TODO: start monitoring current AP signal quality and number of
1095 * missed beacons. Scan other channels every now and then and search
1096 * for better APs. */
1097 /* TODO: remove expired BSSes */
1098
1099 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1100
1101 rcu_read_lock();
1102
1103 sta = sta_info_get(local, ifsta->bssid);
1104 if (!sta) {
1105 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1106 sdata->dev->name, ifsta->bssid);
1107 disassoc = 1;
1108 } else {
1109 disassoc = 0;
1110 if (time_after(jiffies,
1111 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1112 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1113 printk(KERN_DEBUG "%s: No ProbeResp from "
1114 "current AP %pM - assume out of "
1115 "range\n",
1116 sdata->dev->name, ifsta->bssid);
1117 disassoc = 1;
1118 } else
1119 ieee80211_send_probe_req(sdata, ifsta->bssid,
1120 ifsta->ssid,
1121 ifsta->ssid_len);
1122 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1123 } else {
1124 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1125 if (time_after(jiffies, ifsta->last_probe +
1126 IEEE80211_PROBE_INTERVAL)) {
1127 ifsta->last_probe = jiffies;
1128 ieee80211_send_probe_req(sdata, ifsta->bssid,
1129 ifsta->ssid,
1130 ifsta->ssid_len);
1131 }
1132 }
1133 }
1134
1135 rcu_read_unlock();
1136
1137 if (disassoc)
1138 ieee80211_set_disassoc(sdata, ifsta, true, true,
1139 WLAN_REASON_PREV_AUTH_NOT_VALID);
1140 else
1141 mod_timer(&ifsta->timer, jiffies +
1142 IEEE80211_MONITORING_INTERVAL);
1143 }
1144
1145
1146 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1147 struct ieee80211_if_sta *ifsta)
1148 {
1149 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1150 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1151 ieee80211_associate(sdata, ifsta);
1152 }
1153
1154
1155 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1156 struct ieee80211_if_sta *ifsta,
1157 struct ieee80211_mgmt *mgmt,
1158 size_t len)
1159 {
1160 u8 *pos;
1161 struct ieee802_11_elems elems;
1162
1163 pos = mgmt->u.auth.variable;
1164 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1165 if (!elems.challenge)
1166 return;
1167 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1168 elems.challenge_len + 2, 1);
1169 }
1170
1171 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1172 struct ieee80211_if_sta *ifsta,
1173 struct ieee80211_mgmt *mgmt,
1174 size_t len)
1175 {
1176 u16 auth_alg, auth_transaction, status_code;
1177
1178 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1179 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1180 return;
1181
1182 if (len < 24 + 6)
1183 return;
1184
1185 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1186 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1187 return;
1188
1189 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1190 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1191 return;
1192
1193 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1194 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1195 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1196
1197 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1198 /*
1199 * IEEE 802.11 standard does not require authentication in IBSS
1200 * networks and most implementations do not seem to use it.
1201 * However, try to reply to authentication attempts if someone
1202 * has actually implemented this.
1203 */
1204 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1205 return;
1206 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1207 }
1208
1209 if (auth_alg != ifsta->auth_alg ||
1210 auth_transaction != ifsta->auth_transaction)
1211 return;
1212
1213 if (status_code != WLAN_STATUS_SUCCESS) {
1214 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1215 u8 algs[3];
1216 const int num_algs = ARRAY_SIZE(algs);
1217 int i, pos;
1218 algs[0] = algs[1] = algs[2] = 0xff;
1219 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1220 algs[0] = WLAN_AUTH_OPEN;
1221 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1222 algs[1] = WLAN_AUTH_SHARED_KEY;
1223 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1224 algs[2] = WLAN_AUTH_LEAP;
1225 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1226 pos = 0;
1227 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1228 pos = 1;
1229 else
1230 pos = 2;
1231 for (i = 0; i < num_algs; i++) {
1232 pos++;
1233 if (pos >= num_algs)
1234 pos = 0;
1235 if (algs[pos] == ifsta->auth_alg ||
1236 algs[pos] == 0xff)
1237 continue;
1238 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1239 !ieee80211_sta_wep_configured(sdata))
1240 continue;
1241 ifsta->auth_alg = algs[pos];
1242 break;
1243 }
1244 }
1245 return;
1246 }
1247
1248 switch (ifsta->auth_alg) {
1249 case WLAN_AUTH_OPEN:
1250 case WLAN_AUTH_LEAP:
1251 ieee80211_auth_completed(sdata, ifsta);
1252 break;
1253 case WLAN_AUTH_SHARED_KEY:
1254 if (ifsta->auth_transaction == 4)
1255 ieee80211_auth_completed(sdata, ifsta);
1256 else
1257 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1258 break;
1259 }
1260 }
1261
1262
1263 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1264 struct ieee80211_if_sta *ifsta,
1265 struct ieee80211_mgmt *mgmt,
1266 size_t len)
1267 {
1268 u16 reason_code;
1269
1270 if (len < 24 + 2)
1271 return;
1272
1273 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1274 return;
1275
1276 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1277
1278 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1279 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1280 sdata->dev->name, reason_code);
1281
1282 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1283 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1284 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1285 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1286 mod_timer(&ifsta->timer, jiffies +
1287 IEEE80211_RETRY_AUTH_INTERVAL);
1288 }
1289
1290 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1291 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1292 }
1293
1294
1295 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1296 struct ieee80211_if_sta *ifsta,
1297 struct ieee80211_mgmt *mgmt,
1298 size_t len)
1299 {
1300 u16 reason_code;
1301
1302 if (len < 24 + 2)
1303 return;
1304
1305 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1306 return;
1307
1308 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1309
1310 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1311 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1312 sdata->dev->name, reason_code);
1313
1314 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1315 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1316 mod_timer(&ifsta->timer, jiffies +
1317 IEEE80211_RETRY_AUTH_INTERVAL);
1318 }
1319
1320 ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1321 }
1322
1323
1324 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1325 struct ieee80211_if_sta *ifsta,
1326 struct ieee80211_mgmt *mgmt,
1327 size_t len,
1328 int reassoc)
1329 {
1330 struct ieee80211_local *local = sdata->local;
1331 struct ieee80211_supported_band *sband;
1332 struct sta_info *sta;
1333 u32 rates, basic_rates;
1334 u16 capab_info, status_code, aid;
1335 struct ieee802_11_elems elems;
1336 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1337 u8 *pos;
1338 u32 changed = 0;
1339 int i, j;
1340 bool have_higher_than_11mbit = false, newsta = false;
1341 u16 ap_ht_cap_flags;
1342
1343 /* AssocResp and ReassocResp have identical structure, so process both
1344 * of them in this function. */
1345
1346 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1347 return;
1348
1349 if (len < 24 + 6)
1350 return;
1351
1352 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1353 return;
1354
1355 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1356 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1357 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1358
1359 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1360 "status=%d aid=%d)\n",
1361 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1362 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1363
1364 pos = mgmt->u.assoc_resp.variable;
1365 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1366
1367 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1368 elems.timeout_int && elems.timeout_int_len == 5 &&
1369 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1370 u32 tu, ms;
1371 tu = get_unaligned_le32(elems.timeout_int + 1);
1372 ms = tu * 1024 / 1000;
1373 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1374 "comeback duration %u TU (%u ms)\n",
1375 sdata->dev->name, tu, ms);
1376 if (ms > IEEE80211_ASSOC_TIMEOUT)
1377 mod_timer(&ifsta->timer,
1378 jiffies + msecs_to_jiffies(ms));
1379 return;
1380 }
1381
1382 if (status_code != WLAN_STATUS_SUCCESS) {
1383 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1384 sdata->dev->name, status_code);
1385 /* if this was a reassociation, ensure we try a "full"
1386 * association next time. This works around some broken APs
1387 * which do not correctly reject reassociation requests. */
1388 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1389 return;
1390 }
1391
1392 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1393 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1394 "set\n", sdata->dev->name, aid);
1395 aid &= ~(BIT(15) | BIT(14));
1396
1397 if (!elems.supp_rates) {
1398 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1399 sdata->dev->name);
1400 return;
1401 }
1402
1403 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1404 ifsta->aid = aid;
1405 ifsta->ap_capab = capab_info;
1406
1407 kfree(ifsta->assocresp_ies);
1408 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1409 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1410 if (ifsta->assocresp_ies)
1411 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1412
1413 rcu_read_lock();
1414
1415 /* Add STA entry for the AP */
1416 sta = sta_info_get(local, ifsta->bssid);
1417 if (!sta) {
1418 struct ieee80211_bss *bss;
1419
1420 newsta = true;
1421
1422 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1423 if (!sta) {
1424 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1425 " the AP\n", sdata->dev->name);
1426 rcu_read_unlock();
1427 return;
1428 }
1429 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1430 local->hw.conf.channel->center_freq,
1431 ifsta->ssid, ifsta->ssid_len);
1432 if (bss) {
1433 sta->last_signal = bss->signal;
1434 sta->last_qual = bss->qual;
1435 sta->last_noise = bss->noise;
1436 ieee80211_rx_bss_put(local, bss);
1437 }
1438
1439 /* update new sta with its last rx activity */
1440 sta->last_rx = jiffies;
1441 }
1442
1443 /*
1444 * FIXME: Do we really need to update the sta_info's information here?
1445 * We already know about the AP (we found it in our list) so it
1446 * should already be filled with the right info, no?
1447 * As is stands, all this is racy because typically we assume
1448 * the information that is filled in here (except flags) doesn't
1449 * change while a STA structure is alive. As such, it should move
1450 * to between the sta_info_alloc() and sta_info_insert() above.
1451 */
1452
1453 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1454 WLAN_STA_AUTHORIZED);
1455
1456 rates = 0;
1457 basic_rates = 0;
1458 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1459
1460 for (i = 0; i < elems.supp_rates_len; i++) {
1461 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1462 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1463
1464 if (rate > 110)
1465 have_higher_than_11mbit = true;
1466
1467 for (j = 0; j < sband->n_bitrates; j++) {
1468 if (sband->bitrates[j].bitrate == rate) {
1469 rates |= BIT(j);
1470 if (is_basic)
1471 basic_rates |= BIT(j);
1472 break;
1473 }
1474 }
1475 }
1476
1477 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1478 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1479 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1480
1481 if (rate > 110)
1482 have_higher_than_11mbit = true;
1483
1484 for (j = 0; j < sband->n_bitrates; j++) {
1485 if (sband->bitrates[j].bitrate == rate) {
1486 rates |= BIT(j);
1487 if (is_basic)
1488 basic_rates |= BIT(j);
1489 break;
1490 }
1491 }
1492 }
1493
1494 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1495 sdata->vif.bss_conf.basic_rates = basic_rates;
1496
1497 /* cf. IEEE 802.11 9.2.12 */
1498 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1499 have_higher_than_11mbit)
1500 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1501 else
1502 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1503
1504 if (elems.ht_cap_elem)
1505 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1506 elems.ht_cap_elem, &sta->sta.ht_cap);
1507
1508 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1509
1510 rate_control_rate_init(sta);
1511
1512 if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
1513 set_sta_flags(sta, WLAN_STA_MFP);
1514
1515 if (elems.wmm_param)
1516 set_sta_flags(sta, WLAN_STA_WME);
1517
1518 if (newsta) {
1519 int err = sta_info_insert(sta);
1520 if (err) {
1521 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1522 " the AP (error %d)\n", sdata->dev->name, err);
1523 rcu_read_unlock();
1524 return;
1525 }
1526 }
1527
1528 rcu_read_unlock();
1529
1530 if (elems.wmm_param)
1531 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1532 elems.wmm_param_len);
1533
1534 if (elems.ht_info_elem && elems.wmm_param &&
1535 (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1536 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1537 ap_ht_cap_flags);
1538
1539 /* set AID and assoc capability,
1540 * ieee80211_set_associated() will tell the driver */
1541 bss_conf->aid = aid;
1542 bss_conf->assoc_capability = capab_info;
1543 ieee80211_set_associated(sdata, ifsta, changed);
1544
1545 ieee80211_associated(sdata, ifsta);
1546 }
1547
1548
1549 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1550 struct ieee80211_if_sta *ifsta,
1551 struct ieee80211_bss *bss)
1552 {
1553 struct ieee80211_local *local = sdata->local;
1554 int res = 0, rates, i, j;
1555 struct sk_buff *skb;
1556 struct ieee80211_mgmt *mgmt;
1557 u8 *pos;
1558 struct ieee80211_supported_band *sband;
1559 union iwreq_data wrqu;
1560
1561 if (local->ops->reset_tsf) {
1562 /* Reset own TSF to allow time synchronization work. */
1563 local->ops->reset_tsf(local_to_hw(local));
1564 }
1565
1566 if ((ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) &&
1567 memcmp(ifsta->bssid, bss->bssid, ETH_ALEN) == 0)
1568 return res;
1569
1570 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
1571 sdata->u.sta.ie_proberesp_len);
1572 if (!skb) {
1573 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1574 "response\n", sdata->dev->name);
1575 return -ENOMEM;
1576 }
1577
1578 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1579
1580 if (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) {
1581 /* Remove possible STA entries from other IBSS networks. */
1582 sta_info_flush_delayed(sdata);
1583 }
1584
1585 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1586 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1587 if (res)
1588 return res;
1589
1590 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1591
1592 sdata->drop_unencrypted = bss->capability &
1593 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1594
1595 res = ieee80211_set_freq(sdata, bss->freq);
1596
1597 if (res)
1598 return res;
1599
1600 /* Build IBSS probe response */
1601
1602 skb_reserve(skb, local->hw.extra_tx_headroom);
1603
1604 mgmt = (struct ieee80211_mgmt *)
1605 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1606 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1607 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1608 IEEE80211_STYPE_PROBE_RESP);
1609 memset(mgmt->da, 0xff, ETH_ALEN);
1610 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1611 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1612 mgmt->u.beacon.beacon_int =
1613 cpu_to_le16(local->hw.conf.beacon_int);
1614 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1615 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1616
1617 pos = skb_put(skb, 2 + ifsta->ssid_len);
1618 *pos++ = WLAN_EID_SSID;
1619 *pos++ = ifsta->ssid_len;
1620 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1621
1622 rates = bss->supp_rates_len;
1623 if (rates > 8)
1624 rates = 8;
1625 pos = skb_put(skb, 2 + rates);
1626 *pos++ = WLAN_EID_SUPP_RATES;
1627 *pos++ = rates;
1628 memcpy(pos, bss->supp_rates, rates);
1629
1630 if (bss->band == IEEE80211_BAND_2GHZ) {
1631 pos = skb_put(skb, 2 + 1);
1632 *pos++ = WLAN_EID_DS_PARAMS;
1633 *pos++ = 1;
1634 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1635 }
1636
1637 pos = skb_put(skb, 2 + 2);
1638 *pos++ = WLAN_EID_IBSS_PARAMS;
1639 *pos++ = 2;
1640 /* FIX: set ATIM window based on scan results */
1641 *pos++ = 0;
1642 *pos++ = 0;
1643
1644 if (bss->supp_rates_len > 8) {
1645 rates = bss->supp_rates_len - 8;
1646 pos = skb_put(skb, 2 + rates);
1647 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1648 *pos++ = rates;
1649 memcpy(pos, &bss->supp_rates[8], rates);
1650 }
1651
1652 add_extra_ies(skb, sdata->u.sta.ie_proberesp,
1653 sdata->u.sta.ie_proberesp_len);
1654
1655 ifsta->probe_resp = skb;
1656
1657 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON |
1658 IEEE80211_IFCC_BEACON_ENABLED);
1659
1660
1661 rates = 0;
1662 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1663 for (i = 0; i < bss->supp_rates_len; i++) {
1664 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1665 for (j = 0; j < sband->n_bitrates; j++)
1666 if (sband->bitrates[j].bitrate == bitrate)
1667 rates |= BIT(j);
1668 }
1669 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1670
1671 ieee80211_sta_def_wmm_params(sdata, bss);
1672
1673 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
1674 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1675 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1676
1677 ieee80211_led_assoc(local, true);
1678
1679 memset(&wrqu, 0, sizeof(wrqu));
1680 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1681 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1682
1683 return res;
1684 }
1685
1686 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1687 struct ieee80211_mgmt *mgmt,
1688 size_t len,
1689 struct ieee80211_rx_status *rx_status,
1690 struct ieee802_11_elems *elems,
1691 bool beacon)
1692 {
1693 struct ieee80211_local *local = sdata->local;
1694 int freq;
1695 struct ieee80211_bss *bss;
1696 struct sta_info *sta;
1697 struct ieee80211_channel *channel;
1698 u64 beacon_timestamp, rx_timestamp;
1699 u32 supp_rates = 0;
1700 enum ieee80211_band band = rx_status->band;
1701
1702 if (elems->ds_params && elems->ds_params_len == 1)
1703 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1704 else
1705 freq = rx_status->freq;
1706
1707 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1708
1709 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1710 return;
1711
1712 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1713 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1714 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1715
1716 rcu_read_lock();
1717
1718 sta = sta_info_get(local, mgmt->sa);
1719 if (sta) {
1720 u32 prev_rates;
1721
1722 prev_rates = sta->sta.supp_rates[band];
1723 /* make sure mandatory rates are always added */
1724 sta->sta.supp_rates[band] = supp_rates |
1725 ieee80211_mandatory_rates(local, band);
1726
1727 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1728 if (sta->sta.supp_rates[band] != prev_rates)
1729 printk(KERN_DEBUG "%s: updated supp_rates set "
1730 "for %pM based on beacon info (0x%llx | "
1731 "0x%llx -> 0x%llx)\n",
1732 sdata->dev->name,
1733 sta->sta.addr,
1734 (unsigned long long) prev_rates,
1735 (unsigned long long) supp_rates,
1736 (unsigned long long) sta->sta.supp_rates[band]);
1737 #endif
1738 } else {
1739 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1740 }
1741
1742 rcu_read_unlock();
1743 }
1744
1745 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1746 channel, beacon);
1747 if (!bss)
1748 return;
1749
1750 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1751 (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1752 struct ieee80211_channel_sw_ie *sw_elem =
1753 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1754 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1755 }
1756
1757 /* was just updated in ieee80211_bss_info_update */
1758 beacon_timestamp = bss->timestamp;
1759
1760 /*
1761 * In STA mode, the remaining parameters should not be overridden
1762 * by beacons because they're not necessarily accurate there.
1763 */
1764 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1765 bss->last_probe_resp && beacon) {
1766 ieee80211_rx_bss_put(local, bss);
1767 return;
1768 }
1769
1770 /* check if we need to merge IBSS */
1771 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1772 (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1773 bss->capability & WLAN_CAPABILITY_IBSS &&
1774 bss->freq == local->oper_channel->center_freq &&
1775 elems->ssid_len == sdata->u.sta.ssid_len &&
1776 memcmp(elems->ssid, sdata->u.sta.ssid,
1777 sdata->u.sta.ssid_len) == 0) {
1778 if (rx_status->flag & RX_FLAG_TSFT) {
1779 /* in order for correct IBSS merging we need mactime
1780 *
1781 * since mactime is defined as the time the first data
1782 * symbol of the frame hits the PHY, and the timestamp
1783 * of the beacon is defined as "the time that the data
1784 * symbol containing the first bit of the timestamp is
1785 * transmitted to the PHY plus the transmitting STA’s
1786 * delays through its local PHY from the MAC-PHY
1787 * interface to its interface with the WM"
1788 * (802.11 11.1.2) - equals the time this bit arrives at
1789 * the receiver - we have to take into account the
1790 * offset between the two.
1791 * e.g: at 1 MBit that means mactime is 192 usec earlier
1792 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1793 */
1794 int rate;
1795 if (rx_status->flag & RX_FLAG_HT) {
1796 rate = 65; /* TODO: HT rates */
1797 } else {
1798 rate = local->hw.wiphy->bands[band]->
1799 bitrates[rx_status->rate_idx].bitrate;
1800 }
1801 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1802 } else if (local && local->ops && local->ops->get_tsf)
1803 /* second best option: get current TSF */
1804 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1805 else
1806 /* can't merge without knowing the TSF */
1807 rx_timestamp = -1LLU;
1808 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1809 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1810 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1811 mgmt->sa, mgmt->bssid,
1812 (unsigned long long)rx_timestamp,
1813 (unsigned long long)beacon_timestamp,
1814 (unsigned long long)(rx_timestamp - beacon_timestamp),
1815 jiffies);
1816 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1817 if (beacon_timestamp > rx_timestamp) {
1818 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1819 printk(KERN_DEBUG "%s: beacon TSF higher than "
1820 "local TSF - IBSS merge with BSSID %pM\n",
1821 sdata->dev->name, mgmt->bssid);
1822 #endif
1823 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1824 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1825 }
1826 }
1827
1828 ieee80211_rx_bss_put(local, bss);
1829 }
1830
1831
1832 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1833 struct ieee80211_mgmt *mgmt,
1834 size_t len,
1835 struct ieee80211_rx_status *rx_status)
1836 {
1837 size_t baselen;
1838 struct ieee802_11_elems elems;
1839 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1840
1841 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1842 return; /* ignore ProbeResp to foreign address */
1843
1844 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1845 if (baselen > len)
1846 return;
1847
1848 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1849 &elems);
1850
1851 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1852
1853 /* direct probe may be part of the association flow */
1854 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1855 &ifsta->request)) {
1856 printk(KERN_DEBUG "%s direct probe responded\n",
1857 sdata->dev->name);
1858 ieee80211_authenticate(sdata, ifsta);
1859 }
1860 }
1861
1862
1863 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1864 struct ieee80211_mgmt *mgmt,
1865 size_t len,
1866 struct ieee80211_rx_status *rx_status)
1867 {
1868 struct ieee80211_if_sta *ifsta;
1869 size_t baselen;
1870 struct ieee802_11_elems elems;
1871 struct ieee80211_local *local = sdata->local;
1872 u32 changed = 0;
1873 bool erp_valid, directed_tim;
1874 u8 erp_value = 0;
1875
1876 /* Process beacon from the current BSS */
1877 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1878 if (baselen > len)
1879 return;
1880
1881 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1882
1883 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1884
1885 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1886 return;
1887 ifsta = &sdata->u.sta;
1888
1889 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1890 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1891 return;
1892
1893 if (rx_status->freq != local->hw.conf.channel->center_freq)
1894 return;
1895
1896 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1897 elems.wmm_param_len);
1898
1899 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1900 local->hw.conf.flags & IEEE80211_CONF_PS) {
1901 directed_tim = ieee80211_check_tim(&elems, ifsta->aid);
1902
1903 if (directed_tim) {
1904 if (local->hw.conf.dynamic_ps_timeout > 0) {
1905 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1906 ieee80211_hw_config(local,
1907 IEEE80211_CONF_CHANGE_PS);
1908 ieee80211_send_nullfunc(local, sdata, 0);
1909 } else {
1910 local->pspolling = true;
1911
1912 /*
1913 * Here is assumed that the driver will be
1914 * able to send ps-poll frame and receive a
1915 * response even though power save mode is
1916 * enabled, but some drivers might require
1917 * to disable power save here. This needs
1918 * to be investigated.
1919 */
1920 ieee80211_send_pspoll(local, sdata);
1921 }
1922 }
1923 }
1924
1925 if (elems.erp_info && elems.erp_info_len >= 1) {
1926 erp_valid = true;
1927 erp_value = elems.erp_info[0];
1928 } else {
1929 erp_valid = false;
1930 }
1931 changed |= ieee80211_handle_bss_capability(sdata,
1932 le16_to_cpu(mgmt->u.beacon.capab_info),
1933 erp_valid, erp_value);
1934
1935
1936 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1937 struct sta_info *sta;
1938 struct ieee80211_supported_band *sband;
1939 u16 ap_ht_cap_flags;
1940
1941 rcu_read_lock();
1942
1943 sta = sta_info_get(local, ifsta->bssid);
1944 if (!sta) {
1945 rcu_read_unlock();
1946 return;
1947 }
1948
1949 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1950
1951 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1952 elems.ht_cap_elem, &sta->sta.ht_cap);
1953
1954 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1955
1956 rcu_read_unlock();
1957
1958 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1959 ap_ht_cap_flags);
1960 }
1961
1962 if (elems.country_elem) {
1963 /* Note we are only reviewing this on beacons
1964 * for the BSSID we are associated to */
1965 regulatory_hint_11d(local->hw.wiphy,
1966 elems.country_elem, elems.country_elem_len);
1967
1968 /* TODO: IBSS also needs this */
1969 if (elems.pwr_constr_elem)
1970 ieee80211_handle_pwr_constr(sdata,
1971 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1972 elems.pwr_constr_elem,
1973 elems.pwr_constr_elem_len);
1974 }
1975
1976 ieee80211_bss_info_change_notify(sdata, changed);
1977 }
1978
1979
1980 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1981 struct ieee80211_if_sta *ifsta,
1982 struct ieee80211_mgmt *mgmt,
1983 size_t len)
1984 {
1985 struct ieee80211_local *local = sdata->local;
1986 int tx_last_beacon;
1987 struct sk_buff *skb;
1988 struct ieee80211_mgmt *resp;
1989 u8 *pos, *end;
1990
1991 if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1992 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1993 len < 24 + 2 || !ifsta->probe_resp)
1994 return;
1995
1996 if (local->ops->tx_last_beacon)
1997 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1998 else
1999 tx_last_beacon = 1;
2000
2001 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2002 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
2003 " (tx_last_beacon=%d)\n",
2004 sdata->dev->name, mgmt->sa, mgmt->da,
2005 mgmt->bssid, tx_last_beacon);
2006 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2007
2008 if (!tx_last_beacon)
2009 return;
2010
2011 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2012 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2013 return;
2014
2015 end = ((u8 *) mgmt) + len;
2016 pos = mgmt->u.probe_req.variable;
2017 if (pos[0] != WLAN_EID_SSID ||
2018 pos + 2 + pos[1] > end) {
2019 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2020 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2021 "from %pM\n",
2022 sdata->dev->name, mgmt->sa);
2023 #endif
2024 return;
2025 }
2026 if (pos[1] != 0 &&
2027 (pos[1] != ifsta->ssid_len ||
2028 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
2029 /* Ignore ProbeReq for foreign SSID */
2030 return;
2031 }
2032
2033 /* Reply with ProbeResp */
2034 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
2035 if (!skb)
2036 return;
2037
2038 resp = (struct ieee80211_mgmt *) skb->data;
2039 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2040 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2041 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
2042 sdata->dev->name, resp->da);
2043 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2044 ieee80211_tx_skb(sdata, skb, 0);
2045 }
2046
2047 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
2048 struct ieee80211_rx_status *rx_status)
2049 {
2050 struct ieee80211_local *local = sdata->local;
2051 struct ieee80211_if_sta *ifsta;
2052 struct ieee80211_mgmt *mgmt;
2053 u16 fc;
2054
2055 if (skb->len < 24)
2056 goto fail;
2057
2058 ifsta = &sdata->u.sta;
2059
2060 mgmt = (struct ieee80211_mgmt *) skb->data;
2061 fc = le16_to_cpu(mgmt->frame_control);
2062
2063 switch (fc & IEEE80211_FCTL_STYPE) {
2064 case IEEE80211_STYPE_PROBE_REQ:
2065 case IEEE80211_STYPE_PROBE_RESP:
2066 case IEEE80211_STYPE_BEACON:
2067 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2068 case IEEE80211_STYPE_AUTH:
2069 case IEEE80211_STYPE_ASSOC_RESP:
2070 case IEEE80211_STYPE_REASSOC_RESP:
2071 case IEEE80211_STYPE_DEAUTH:
2072 case IEEE80211_STYPE_DISASSOC:
2073 skb_queue_tail(&ifsta->skb_queue, skb);
2074 queue_work(local->hw.workqueue, &ifsta->work);
2075 return;
2076 }
2077
2078 fail:
2079 kfree_skb(skb);
2080 }
2081
2082 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2083 struct sk_buff *skb)
2084 {
2085 struct ieee80211_rx_status *rx_status;
2086 struct ieee80211_if_sta *ifsta;
2087 struct ieee80211_mgmt *mgmt;
2088 u16 fc;
2089
2090 ifsta = &sdata->u.sta;
2091
2092 rx_status = (struct ieee80211_rx_status *) skb->cb;
2093 mgmt = (struct ieee80211_mgmt *) skb->data;
2094 fc = le16_to_cpu(mgmt->frame_control);
2095
2096 switch (fc & IEEE80211_FCTL_STYPE) {
2097 case IEEE80211_STYPE_PROBE_REQ:
2098 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
2099 break;
2100 case IEEE80211_STYPE_PROBE_RESP:
2101 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
2102 break;
2103 case IEEE80211_STYPE_BEACON:
2104 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2105 break;
2106 case IEEE80211_STYPE_AUTH:
2107 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2108 break;
2109 case IEEE80211_STYPE_ASSOC_RESP:
2110 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2111 break;
2112 case IEEE80211_STYPE_REASSOC_RESP:
2113 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2114 break;
2115 case IEEE80211_STYPE_DEAUTH:
2116 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2117 break;
2118 case IEEE80211_STYPE_DISASSOC:
2119 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2120 break;
2121 }
2122
2123 kfree_skb(skb);
2124 }
2125
2126
2127 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
2128 {
2129 struct ieee80211_local *local = sdata->local;
2130 int active = 0;
2131 struct sta_info *sta;
2132
2133 rcu_read_lock();
2134
2135 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2136 if (sta->sdata == sdata &&
2137 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2138 jiffies)) {
2139 active++;
2140 break;
2141 }
2142 }
2143
2144 rcu_read_unlock();
2145
2146 return active;
2147 }
2148
2149
2150 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2151 struct ieee80211_if_sta *ifsta)
2152 {
2153 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2154
2155 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2156 if (ieee80211_sta_active_ibss(sdata))
2157 return;
2158
2159 if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2160 (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2161 return;
2162
2163 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2164 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2165
2166 /* XXX maybe racy? */
2167 if (sdata->local->scan_req)
2168 return;
2169
2170 memcpy(sdata->local->int_scan_req.ssids[0].ssid,
2171 ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2172 sdata->local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2173 ieee80211_request_scan(sdata, &sdata->local->int_scan_req);
2174 }
2175
2176
2177 static void ieee80211_sta_timer(unsigned long data)
2178 {
2179 struct ieee80211_sub_if_data *sdata =
2180 (struct ieee80211_sub_if_data *) data;
2181 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2182 struct ieee80211_local *local = sdata->local;
2183
2184 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2185 queue_work(local->hw.workqueue, &ifsta->work);
2186 }
2187
2188 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2189 struct ieee80211_if_sta *ifsta)
2190 {
2191 struct ieee80211_local *local = sdata->local;
2192
2193 if (local->ops->reset_tsf) {
2194 /* Reset own TSF to allow time synchronization work. */
2195 local->ops->reset_tsf(local_to_hw(local));
2196 }
2197
2198 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2199
2200
2201 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2202 ifsta->auth_alg = WLAN_AUTH_OPEN;
2203 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2204 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2205 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2206 ifsta->auth_alg = WLAN_AUTH_LEAP;
2207 else
2208 ifsta->auth_alg = WLAN_AUTH_OPEN;
2209 ifsta->auth_transaction = -1;
2210 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2211 ifsta->assoc_scan_tries = 0;
2212 ifsta->direct_probe_tries = 0;
2213 ifsta->auth_tries = 0;
2214 ifsta->assoc_tries = 0;
2215 netif_tx_stop_all_queues(sdata->dev);
2216 netif_carrier_off(sdata->dev);
2217 }
2218
2219
2220 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2221 const char *ssid, int ssid_len)
2222 {
2223 int tmp, hidden_ssid;
2224
2225 if (ssid_len == ifsta->ssid_len &&
2226 !memcmp(ifsta->ssid, ssid, ssid_len))
2227 return 1;
2228
2229 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2230 return 0;
2231
2232 hidden_ssid = 1;
2233 tmp = ssid_len;
2234 while (tmp--) {
2235 if (ssid[tmp] != '\0') {
2236 hidden_ssid = 0;
2237 break;
2238 }
2239 }
2240
2241 if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2242 return 1;
2243
2244 if (ssid_len == 1 && ssid[0] == ' ')
2245 return 1;
2246
2247 return 0;
2248 }
2249
2250 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2251 struct ieee80211_if_sta *ifsta)
2252 {
2253 struct ieee80211_local *local = sdata->local;
2254 struct ieee80211_bss *bss;
2255 struct ieee80211_supported_band *sband;
2256 u8 bssid[ETH_ALEN], *pos;
2257 int i;
2258 int ret;
2259
2260 if (sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) {
2261 memcpy(bssid, ifsta->bssid, ETH_ALEN);
2262 } else {
2263 /* Generate random, not broadcast, locally administered BSSID. Mix in
2264 * own MAC address to make sure that devices that do not have proper
2265 * random number generator get different BSSID. */
2266 get_random_bytes(bssid, ETH_ALEN);
2267 for (i = 0; i < ETH_ALEN; i++)
2268 bssid[i] ^= sdata->dev->dev_addr[i];
2269 bssid[0] &= ~0x01;
2270 bssid[0] |= 0x02;
2271 }
2272
2273 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2274 sdata->dev->name, bssid);
2275
2276 bss = ieee80211_rx_bss_add(local, bssid,
2277 local->hw.conf.channel->center_freq,
2278 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2279 if (!bss)
2280 return -ENOMEM;
2281
2282 bss->band = local->hw.conf.channel->band;
2283 sband = local->hw.wiphy->bands[bss->band];
2284
2285 if (local->hw.conf.beacon_int == 0)
2286 local->hw.conf.beacon_int = 100;
2287 bss->beacon_int = local->hw.conf.beacon_int;
2288 bss->last_update = jiffies;
2289 bss->capability = WLAN_CAPABILITY_IBSS;
2290
2291 if (sdata->default_key)
2292 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2293 else
2294 sdata->drop_unencrypted = 0;
2295
2296 bss->supp_rates_len = sband->n_bitrates;
2297 pos = bss->supp_rates;
2298 for (i = 0; i < sband->n_bitrates; i++) {
2299 int rate = sband->bitrates[i].bitrate;
2300 *pos++ = (u8) (rate / 5);
2301 }
2302
2303 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2304 ieee80211_rx_bss_put(local, bss);
2305 return ret;
2306 }
2307
2308
2309 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2310 struct ieee80211_if_sta *ifsta)
2311 {
2312 struct ieee80211_local *local = sdata->local;
2313 struct ieee80211_bss *bss;
2314 int found = 0;
2315 u8 bssid[ETH_ALEN];
2316 int active_ibss;
2317
2318 if (ifsta->ssid_len == 0)
2319 return -EINVAL;
2320
2321 active_ibss = ieee80211_sta_active_ibss(sdata);
2322 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2323 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2324 sdata->dev->name, active_ibss);
2325 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2326 spin_lock_bh(&local->bss_lock);
2327 list_for_each_entry(bss, &local->bss_list, list) {
2328 if (ifsta->ssid_len != bss->ssid_len ||
2329 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2330 || !(bss->capability & WLAN_CAPABILITY_IBSS))
2331 continue;
2332 if ((ifsta->flags & IEEE80211_STA_BSSID_SET) &&
2333 memcmp(ifsta->bssid, bss->bssid, ETH_ALEN) != 0)
2334 continue;
2335 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2336 printk(KERN_DEBUG " bssid=%pM found\n", bss->bssid);
2337 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2338 memcpy(bssid, bss->bssid, ETH_ALEN);
2339 found = 1;
2340 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2341 break;
2342 }
2343 spin_unlock_bh(&local->bss_lock);
2344
2345 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2346 if (found)
2347 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
2348 "%pM\n", bssid, ifsta->bssid);
2349 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2350
2351 if (found &&
2352 ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2353 memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0)) {
2354 int ret;
2355 int search_freq;
2356
2357 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2358 search_freq = bss->freq;
2359 else
2360 search_freq = local->hw.conf.channel->center_freq;
2361
2362 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2363 ifsta->ssid, ifsta->ssid_len);
2364 if (!bss)
2365 goto dont_join;
2366
2367 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2368 " based on configured SSID\n",
2369 sdata->dev->name, bssid);
2370 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2371 ieee80211_rx_bss_put(local, bss);
2372 return ret;
2373 }
2374
2375 dont_join:
2376 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2377 printk(KERN_DEBUG " did not try to join ibss\n");
2378 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2379
2380 /* Selected IBSS not found in current scan results - try to scan */
2381 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2382 !ieee80211_sta_active_ibss(sdata)) {
2383 mod_timer(&ifsta->timer, jiffies +
2384 IEEE80211_IBSS_MERGE_INTERVAL);
2385 } else if (time_after(jiffies, local->last_scan_completed +
2386 IEEE80211_SCAN_INTERVAL)) {
2387 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2388 "join\n", sdata->dev->name);
2389
2390 /* XXX maybe racy? */
2391 if (local->scan_req)
2392 return -EBUSY;
2393
2394 memcpy(local->int_scan_req.ssids[0].ssid,
2395 ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2396 local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2397 return ieee80211_request_scan(sdata, &local->int_scan_req);
2398 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2399 int interval = IEEE80211_SCAN_INTERVAL;
2400
2401 if (time_after(jiffies, ifsta->ibss_join_req +
2402 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2403 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2404 (!(local->oper_channel->flags &
2405 IEEE80211_CHAN_NO_IBSS)))
2406 return ieee80211_sta_create_ibss(sdata, ifsta);
2407 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2408 printk(KERN_DEBUG "%s: IBSS not allowed on"
2409 " %d MHz\n", sdata->dev->name,
2410 local->hw.conf.channel->center_freq);
2411 }
2412
2413 /* No IBSS found - decrease scan interval and continue
2414 * scanning. */
2415 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2416 }
2417
2418 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2419 mod_timer(&ifsta->timer, jiffies + interval);
2420 return 0;
2421 }
2422
2423 return 0;
2424 }
2425
2426
2427 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2428 struct ieee80211_if_sta *ifsta)
2429 {
2430 struct ieee80211_local *local = sdata->local;
2431 struct ieee80211_bss *bss, *selected = NULL;
2432 int top_rssi = 0, freq;
2433
2434 spin_lock_bh(&local->bss_lock);
2435 freq = local->oper_channel->center_freq;
2436 list_for_each_entry(bss, &local->bss_list, list) {
2437 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2438 continue;
2439
2440 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2441 IEEE80211_STA_AUTO_BSSID_SEL |
2442 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2443 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2444 !!sdata->default_key))
2445 continue;
2446
2447 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2448 bss->freq != freq)
2449 continue;
2450
2451 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2452 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2453 continue;
2454
2455 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2456 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2457 continue;
2458
2459 if (!selected || top_rssi < bss->signal) {
2460 selected = bss;
2461 top_rssi = bss->signal;
2462 }
2463 }
2464 if (selected)
2465 atomic_inc(&selected->users);
2466 spin_unlock_bh(&local->bss_lock);
2467
2468 if (selected) {
2469 ieee80211_set_freq(sdata, selected->freq);
2470 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2471 ieee80211_sta_set_ssid(sdata, selected->ssid,
2472 selected->ssid_len);
2473 ieee80211_sta_set_bssid(sdata, selected->bssid);
2474 ieee80211_sta_def_wmm_params(sdata, selected);
2475 if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
2476 sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
2477 else
2478 sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
2479
2480 /* Send out direct probe if no probe resp was received or
2481 * the one we have is outdated
2482 */
2483 if (!selected->last_probe_resp ||
2484 time_after(jiffies, selected->last_probe_resp
2485 + IEEE80211_SCAN_RESULT_EXPIRE))
2486 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2487 else
2488 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2489
2490 ieee80211_rx_bss_put(local, selected);
2491 ieee80211_sta_reset_auth(sdata, ifsta);
2492 return 0;
2493 } else {
2494 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2495 ifsta->assoc_scan_tries++;
2496 /* XXX maybe racy? */
2497 if (local->scan_req)
2498 return -1;
2499 memcpy(local->int_scan_req.ssids[0].ssid,
2500 ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2501 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2502 local->int_scan_req.ssids[0].ssid_len = 0;
2503 else
2504 local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2505 ieee80211_start_scan(sdata, &local->int_scan_req);
2506 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2507 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2508 } else {
2509 ifsta->assoc_scan_tries = 0;
2510 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2511 }
2512 }
2513 return -1;
2514 }
2515
2516
2517 static void ieee80211_sta_work(struct work_struct *work)
2518 {
2519 struct ieee80211_sub_if_data *sdata =
2520 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2521 struct ieee80211_local *local = sdata->local;
2522 struct ieee80211_if_sta *ifsta;
2523 struct sk_buff *skb;
2524
2525 if (!netif_running(sdata->dev))
2526 return;
2527
2528 if (local->sw_scanning || local->hw_scanning)
2529 return;
2530
2531 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2532 sdata->vif.type != NL80211_IFTYPE_ADHOC))
2533 return;
2534 ifsta = &sdata->u.sta;
2535
2536 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2537 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2538
2539 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2540 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2541 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2542 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2543 ieee80211_start_scan(sdata, local->scan_req);
2544 return;
2545 }
2546
2547 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2548 if (ieee80211_sta_config_auth(sdata, ifsta))
2549 return;
2550 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2551 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2552 return;
2553
2554 switch (ifsta->state) {
2555 case IEEE80211_STA_MLME_DISABLED:
2556 break;
2557 case IEEE80211_STA_MLME_DIRECT_PROBE:
2558 ieee80211_direct_probe(sdata, ifsta);
2559 break;
2560 case IEEE80211_STA_MLME_AUTHENTICATE:
2561 ieee80211_authenticate(sdata, ifsta);
2562 break;
2563 case IEEE80211_STA_MLME_ASSOCIATE:
2564 ieee80211_associate(sdata, ifsta);
2565 break;
2566 case IEEE80211_STA_MLME_ASSOCIATED:
2567 ieee80211_associated(sdata, ifsta);
2568 break;
2569 case IEEE80211_STA_MLME_IBSS_SEARCH:
2570 ieee80211_sta_find_ibss(sdata, ifsta);
2571 break;
2572 case IEEE80211_STA_MLME_IBSS_JOINED:
2573 ieee80211_sta_merge_ibss(sdata, ifsta);
2574 break;
2575 default:
2576 WARN_ON(1);
2577 break;
2578 }
2579
2580 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2581 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2582 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2583
2584 ieee80211_set_disassoc(sdata, ifsta, false, true,
2585 WLAN_REASON_UNSPECIFIED);
2586 }
2587 }
2588
2589 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2590 {
2591 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2592 queue_work(sdata->local->hw.workqueue,
2593 &sdata->u.sta.work);
2594 }
2595
2596 /* interface setup */
2597 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2598 {
2599 struct ieee80211_if_sta *ifsta;
2600
2601 ifsta = &sdata->u.sta;
2602 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2603 INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2604 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2605 (unsigned long) sdata);
2606 setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2607 (unsigned long) sdata);
2608 skb_queue_head_init(&ifsta->skb_queue);
2609
2610 ifsta->capab = WLAN_CAPABILITY_ESS;
2611 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2612 IEEE80211_AUTH_ALG_SHARED_KEY;
2613 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2614 IEEE80211_STA_AUTO_BSSID_SEL |
2615 IEEE80211_STA_AUTO_CHANNEL_SEL;
2616 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2617 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2618 }
2619
2620 /*
2621 * Add a new IBSS station, will also be called by the RX code when,
2622 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2623 * must be callable in atomic context.
2624 */
2625 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2626 u8 *bssid,u8 *addr, u32 supp_rates)
2627 {
2628 struct ieee80211_local *local = sdata->local;
2629 struct sta_info *sta;
2630 int band = local->hw.conf.channel->band;
2631
2632 /* TODO: Could consider removing the least recently used entry and
2633 * allow new one to be added. */
2634 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2635 if (net_ratelimit()) {
2636 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2637 "entry %pM\n", sdata->dev->name, addr);
2638 }
2639 return NULL;
2640 }
2641
2642 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2643 return NULL;
2644
2645 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2646 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2647 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2648 #endif
2649
2650 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2651 if (!sta)
2652 return NULL;
2653
2654 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2655
2656 /* make sure mandatory rates are always added */
2657 sta->sta.supp_rates[band] = supp_rates |
2658 ieee80211_mandatory_rates(local, band);
2659
2660 rate_control_rate_init(sta);
2661
2662 if (sta_info_insert(sta))
2663 return NULL;
2664
2665 return sta;
2666 }
2667
2668 /* configuration hooks */
2669 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2670 struct ieee80211_if_sta *ifsta)
2671 {
2672 struct ieee80211_local *local = sdata->local;
2673
2674 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2675 return;
2676
2677 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2678 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2679 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2680 IEEE80211_STA_AUTO_SSID_SEL))) {
2681
2682 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2683 ieee80211_set_disassoc(sdata, ifsta, true, true,
2684 WLAN_REASON_DEAUTH_LEAVING);
2685
2686 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2687 queue_work(local->hw.workqueue, &ifsta->work);
2688 }
2689 }
2690
2691 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2692 {
2693 struct ieee80211_if_sta *ifsta;
2694
2695 if (len > IEEE80211_MAX_SSID_LEN)
2696 return -EINVAL;
2697
2698 ifsta = &sdata->u.sta;
2699
2700 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2701 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2702 memcpy(ifsta->ssid, ssid, len);
2703 ifsta->ssid_len = len;
2704 }
2705
2706 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2707
2708 if (len)
2709 ifsta->flags |= IEEE80211_STA_SSID_SET;
2710 else
2711 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2712
2713 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2714 ifsta->ibss_join_req = jiffies;
2715 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2716 return ieee80211_sta_find_ibss(sdata, ifsta);
2717 }
2718
2719 return 0;
2720 }
2721
2722 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2723 {
2724 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2725 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2726 *len = ifsta->ssid_len;
2727 return 0;
2728 }
2729
2730 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2731 {
2732 struct ieee80211_if_sta *ifsta;
2733
2734 ifsta = &sdata->u.sta;
2735
2736 if (is_valid_ether_addr(bssid)) {
2737 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2738 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2739 } else {
2740 memset(ifsta->bssid, 0, ETH_ALEN);
2741 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2742 }
2743
2744 if (netif_running(sdata->dev)) {
2745 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2746 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2747 "the low-level driver\n", sdata->dev->name);
2748 }
2749 }
2750
2751 return ieee80211_sta_set_ssid(sdata, ifsta->ssid, ifsta->ssid_len);
2752 }
2753
2754 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2755 {
2756 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2757
2758 kfree(ifsta->extra_ie);
2759 if (len == 0) {
2760 ifsta->extra_ie = NULL;
2761 ifsta->extra_ie_len = 0;
2762 return 0;
2763 }
2764 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2765 if (!ifsta->extra_ie) {
2766 ifsta->extra_ie_len = 0;
2767 return -ENOMEM;
2768 }
2769 memcpy(ifsta->extra_ie, ie, len);
2770 ifsta->extra_ie_len = len;
2771 return 0;
2772 }
2773
2774 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2775 {
2776 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2777
2778 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2779 sdata->dev->name, reason);
2780
2781 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2782 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2783 return -EINVAL;
2784
2785 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2786 return 0;
2787 }
2788
2789 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2790 {
2791 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2792
2793 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2794 sdata->dev->name, reason);
2795
2796 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2797 return -EINVAL;
2798
2799 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2800 return -1;
2801
2802 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2803 return 0;
2804 }
2805
2806 /* scan finished notification */
2807 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2808 {
2809 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2810 struct ieee80211_if_sta *ifsta;
2811
2812 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2813 ifsta = &sdata->u.sta;
2814 if ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2815 !ieee80211_sta_active_ibss(sdata))
2816 ieee80211_sta_find_ibss(sdata, ifsta);
2817 }
2818
2819 /* Restart STA timers */
2820 rcu_read_lock();
2821 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2822 ieee80211_restart_sta_timer(sdata);
2823 rcu_read_unlock();
2824 }
2825
2826 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2827 {
2828 struct ieee80211_local *local =
2829 container_of(work, struct ieee80211_local,
2830 dynamic_ps_disable_work);
2831
2832 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2833 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2834 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2835 }
2836
2837 ieee80211_wake_queues_by_reason(&local->hw,
2838 IEEE80211_QUEUE_STOP_REASON_PS);
2839 }
2840
2841 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2842 {
2843 struct ieee80211_local *local =
2844 container_of(work, struct ieee80211_local,
2845 dynamic_ps_enable_work);
2846 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2847
2848 if (local->hw.conf.flags & IEEE80211_CONF_PS)
2849 return;
2850
2851 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2852 ieee80211_send_nullfunc(local, sdata, 1);
2853
2854 local->hw.conf.flags |= IEEE80211_CONF_PS;
2855 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2856 }
2857
2858 void ieee80211_dynamic_ps_timer(unsigned long data)
2859 {
2860 struct ieee80211_local *local = (void *) data;
2861
2862 queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2863 }
Linux kernel - Deliverables
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