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mac80211: Fix MFP Association Comeback to use Timeout Interval IE
[linux-2.6.git] / net / mac80211 / mlme.c
blobb9e4b93089c48c3f79b1fe499815eb8d36917e0b
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/wireless.h>
19 #include <linux/random.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/iw_handler.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
32 #define IEEE80211_AUTH_MAX_TRIES 3
33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
34 #define IEEE80211_ASSOC_MAX_TRIES 3
35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
36 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
38 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
41
42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
44
45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
46
47
48 /* utils */
49 static int ecw2cw(int ecw)
50 {
51 return (1 << ecw) - 1;
52 }
53
54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
55 {
56 u8 *end, *pos;
57
58 pos = bss->ies;
59 if (pos == NULL)
60 return NULL;
61 end = pos + bss->ies_len;
62
63 while (pos + 1 < end) {
64 if (pos + 2 + pos[1] > end)
65 break;
66 if (pos[0] == ie)
67 return pos;
68 pos += 2 + pos[1];
69 }
70
71 return NULL;
72 }
73
74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
75 struct ieee80211_supported_band *sband,
76 u64 *rates)
77 {
78 int i, j, count;
79 *rates = 0;
80 count = 0;
81 for (i = 0; i < bss->supp_rates_len; i++) {
82 int rate = (bss->supp_rates[i] & 0x7F) * 5;
83
84 for (j = 0; j < sband->n_bitrates; j++)
85 if (sband->bitrates[j].bitrate == rate) {
86 *rates |= BIT(j);
87 count++;
88 break;
89 }
90 }
91
92 return count;
93 }
94
95 /* also used by mesh code */
96 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
97 struct ieee802_11_elems *elems,
98 enum ieee80211_band band)
99 {
100 struct ieee80211_supported_band *sband;
101 struct ieee80211_rate *bitrates;
102 size_t num_rates;
103 u64 supp_rates;
104 int i, j;
105 sband = local->hw.wiphy->bands[band];
106
107 if (!sband) {
108 WARN_ON(1);
109 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
110 }
111
112 bitrates = sband->bitrates;
113 num_rates = sband->n_bitrates;
114 supp_rates = 0;
115 for (i = 0; i < elems->supp_rates_len +
116 elems->ext_supp_rates_len; i++) {
117 u8 rate = 0;
118 int own_rate;
119 if (i < elems->supp_rates_len)
120 rate = elems->supp_rates[i];
121 else if (elems->ext_supp_rates)
122 rate = elems->ext_supp_rates
123 [i - elems->supp_rates_len];
124 own_rate = 5 * (rate & 0x7f);
125 for (j = 0; j < num_rates; j++)
126 if (bitrates[j].bitrate == own_rate)
127 supp_rates |= BIT(j);
128 }
129 return supp_rates;
130 }
131
132 /* frame sending functions */
133
134 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 u64 rates = 0;
257 size_t e_ies_len;
258
259 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
260 e_ies = sdata->u.sta.ie_reassocreq;
261 e_ies_len = sdata->u.sta.ie_reassocreq_len;
262 } else {
263 e_ies = sdata->u.sta.ie_assocreq;
264 e_ies_len = sdata->u.sta.ie_assocreq_len;
265 }
266
267 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
268 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
269 ifsta->ssid_len + e_ies_len);
270 if (!skb) {
271 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
272 "frame\n", sdata->dev->name);
273 return;
274 }
275 skb_reserve(skb, local->hw.extra_tx_headroom);
276
277 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
278
279 capab = ifsta->capab;
280
281 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
282 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
283 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
284 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
285 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
286 }
287
288 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
289 local->hw.conf.channel->center_freq,
290 ifsta->ssid, ifsta->ssid_len);
291 if (bss) {
292 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
293 capab |= WLAN_CAPABILITY_PRIVACY;
294 if (bss->wmm_used)
295 wmm = 1;
296
297 /* get all rates supported by the device and the AP as
298 * some APs don't like getting a superset of their rates
299 * in the association request (e.g. D-Link DAP 1353 in
300 * b-only mode) */
301 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
302
303 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
304 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
305 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
306
307 ieee80211_rx_bss_put(local, bss);
308 } else {
309 rates = ~0;
310 rates_len = sband->n_bitrates;
311 }
312
313 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
314 memset(mgmt, 0, 24);
315 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
316 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
317 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
318
319 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
320 skb_put(skb, 10);
321 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
322 IEEE80211_STYPE_REASSOC_REQ);
323 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
324 mgmt->u.reassoc_req.listen_interval =
325 cpu_to_le16(local->hw.conf.listen_interval);
326 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
327 ETH_ALEN);
328 } else {
329 skb_put(skb, 4);
330 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
331 IEEE80211_STYPE_ASSOC_REQ);
332 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
333 mgmt->u.assoc_req.listen_interval =
334 cpu_to_le16(local->hw.conf.listen_interval);
335 }
336
337 /* SSID */
338 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
339 *pos++ = WLAN_EID_SSID;
340 *pos++ = ifsta->ssid_len;
341 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
342
343 /* add all rates which were marked to be used above */
344 supp_rates_len = rates_len;
345 if (supp_rates_len > 8)
346 supp_rates_len = 8;
347
348 len = sband->n_bitrates;
349 pos = skb_put(skb, supp_rates_len + 2);
350 *pos++ = WLAN_EID_SUPP_RATES;
351 *pos++ = supp_rates_len;
352
353 count = 0;
354 for (i = 0; i < sband->n_bitrates; i++) {
355 if (BIT(i) & rates) {
356 int rate = sband->bitrates[i].bitrate;
357 *pos++ = (u8) (rate / 5);
358 if (++count == 8)
359 break;
360 }
361 }
362
363 if (rates_len > count) {
364 pos = skb_put(skb, rates_len - count + 2);
365 *pos++ = WLAN_EID_EXT_SUPP_RATES;
366 *pos++ = rates_len - count;
367
368 for (i++; i < sband->n_bitrates; i++) {
369 if (BIT(i) & rates) {
370 int rate = sband->bitrates[i].bitrate;
371 *pos++ = (u8) (rate / 5);
372 }
373 }
374 }
375
376 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
377 /* 1. power capabilities */
378 pos = skb_put(skb, 4);
379 *pos++ = WLAN_EID_PWR_CAPABILITY;
380 *pos++ = 2;
381 *pos++ = 0; /* min tx power */
382 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
383
384 /* 2. supported channels */
385 /* TODO: get this in reg domain format */
386 pos = skb_put(skb, 2 * sband->n_channels + 2);
387 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
388 *pos++ = 2 * sband->n_channels;
389 for (i = 0; i < sband->n_channels; i++) {
390 *pos++ = ieee80211_frequency_to_channel(
391 sband->channels[i].center_freq);
392 *pos++ = 1; /* one channel in the subband*/
393 }
394 }
395
396 if (ifsta->extra_ie) {
397 pos = skb_put(skb, ifsta->extra_ie_len);
398 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
399 }
400
401 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
402 pos = skb_put(skb, 9);
403 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
404 *pos++ = 7; /* len */
405 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
406 *pos++ = 0x50;
407 *pos++ = 0xf2;
408 *pos++ = 2; /* WME */
409 *pos++ = 0; /* WME info */
410 *pos++ = 1; /* WME ver */
411 *pos++ = 0;
412 }
413
414 /* wmm support is a must to HT */
415 /*
416 * IEEE802.11n does not allow TKIP/WEP as pairwise
417 * ciphers in HT mode. We still associate in non-ht
418 * mode (11a/b/g) if any one of these ciphers is
419 * configured as pairwise.
420 */
421 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
422 sband->ht_cap.ht_supported &&
423 (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
424 ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
425 (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
426 struct ieee80211_ht_info *ht_info =
427 (struct ieee80211_ht_info *)(ht_ie + 2);
428 u16 cap = sband->ht_cap.cap;
429 __le16 tmp;
430 u32 flags = local->hw.conf.channel->flags;
431
432 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
433 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
434 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
435 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
436 cap &= ~IEEE80211_HT_CAP_SGI_40;
437 }
438 break;
439 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
440 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
441 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
442 cap &= ~IEEE80211_HT_CAP_SGI_40;
443 }
444 break;
445 }
446
447 tmp = cpu_to_le16(cap);
448 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
449 *pos++ = WLAN_EID_HT_CAPABILITY;
450 *pos++ = sizeof(struct ieee80211_ht_cap);
451 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
452 memcpy(pos, &tmp, sizeof(u16));
453 pos += sizeof(u16);
454 /* TODO: needs a define here for << 2 */
455 *pos++ = sband->ht_cap.ampdu_factor |
456 (sband->ht_cap.ampdu_density << 2);
457 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
458 }
459
460 add_extra_ies(skb, e_ies, e_ies_len);
461
462 kfree(ifsta->assocreq_ies);
463 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
464 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
465 if (ifsta->assocreq_ies)
466 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
467
468 ieee80211_tx_skb(sdata, skb, 0);
469 }
470
471
472 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
473 u16 stype, u16 reason)
474 {
475 struct ieee80211_local *local = sdata->local;
476 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
477 struct sk_buff *skb;
478 struct ieee80211_mgmt *mgmt;
479 u8 *ies;
480 size_t ies_len;
481
482 if (stype == IEEE80211_STYPE_DEAUTH) {
483 ies = sdata->u.sta.ie_deauth;
484 ies_len = sdata->u.sta.ie_deauth_len;
485 } else {
486 ies = sdata->u.sta.ie_disassoc;
487 ies_len = sdata->u.sta.ie_disassoc_len;
488 }
489
490 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) +
491 ies_len);
492 if (!skb) {
493 printk(KERN_DEBUG "%s: failed to allocate buffer for "
494 "deauth/disassoc frame\n", sdata->dev->name);
495 return;
496 }
497 skb_reserve(skb, local->hw.extra_tx_headroom);
498
499 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
500 memset(mgmt, 0, 24);
501 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
502 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
503 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
504 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
505 skb_put(skb, 2);
506 /* u.deauth.reason_code == u.disassoc.reason_code */
507 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
508
509 add_extra_ies(skb, ies, ies_len);
510
511 ieee80211_tx_skb(sdata, skb, ifsta->flags & IEEE80211_STA_MFP_ENABLED);
512 }
513
514 /* MLME */
515 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
516 struct ieee80211_bss *bss)
517 {
518 struct ieee80211_local *local = sdata->local;
519 int i, have_higher_than_11mbit = 0;
520
521 /* cf. IEEE 802.11 9.2.12 */
522 for (i = 0; i < bss->supp_rates_len; i++)
523 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
524 have_higher_than_11mbit = 1;
525
526 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
527 have_higher_than_11mbit)
528 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
529 else
530 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
531
532 ieee80211_set_wmm_default(sdata);
533 }
534
535 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
536 struct ieee80211_if_sta *ifsta,
537 u8 *wmm_param, size_t wmm_param_len)
538 {
539 struct ieee80211_tx_queue_params params;
540 size_t left;
541 int count;
542 u8 *pos;
543
544 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
545 return;
546
547 if (!wmm_param)
548 return;
549
550 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
551 return;
552 count = wmm_param[6] & 0x0f;
553 if (count == ifsta->wmm_last_param_set)
554 return;
555 ifsta->wmm_last_param_set = count;
556
557 pos = wmm_param + 8;
558 left = wmm_param_len - 8;
559
560 memset(&params, 0, sizeof(params));
561
562 if (!local->ops->conf_tx)
563 return;
564
565 local->wmm_acm = 0;
566 for (; left >= 4; left -= 4, pos += 4) {
567 int aci = (pos[0] >> 5) & 0x03;
568 int acm = (pos[0] >> 4) & 0x01;
569 int queue;
570
571 switch (aci) {
572 case 1:
573 queue = 3;
574 if (acm)
575 local->wmm_acm |= BIT(0) | BIT(3);
576 break;
577 case 2:
578 queue = 1;
579 if (acm)
580 local->wmm_acm |= BIT(4) | BIT(5);
581 break;
582 case 3:
583 queue = 0;
584 if (acm)
585 local->wmm_acm |= BIT(6) | BIT(7);
586 break;
587 case 0:
588 default:
589 queue = 2;
590 if (acm)
591 local->wmm_acm |= BIT(1) | BIT(2);
592 break;
593 }
594
595 params.aifs = pos[0] & 0x0f;
596 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
597 params.cw_min = ecw2cw(pos[1] & 0x0f);
598 params.txop = get_unaligned_le16(pos + 2);
599 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
600 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
601 "cWmin=%d cWmax=%d txop=%d\n",
602 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
603 params.cw_max, params.txop);
604 #endif
605 /* TODO: handle ACM (block TX, fallback to next lowest allowed
606 * AC for now) */
607 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
608 printk(KERN_DEBUG "%s: failed to set TX queue "
609 "parameters for queue %d\n", local->mdev->name, queue);
610 }
611 }
612 }
613
614 static bool check_tim(struct ieee802_11_elems *elems, u16 aid, bool *is_mc)
615 {
616 u8 mask;
617 u8 index, indexn1, indexn2;
618 struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
619
620 aid &= 0x3fff;
621 index = aid / 8;
622 mask = 1 << (aid & 7);
623
624 if (tim->bitmap_ctrl & 0x01)
625 *is_mc = true;
626
627 indexn1 = tim->bitmap_ctrl & 0xfe;
628 indexn2 = elems->tim_len + indexn1 - 4;
629
630 if (index < indexn1 || index > indexn2)
631 return false;
632
633 index -= indexn1;
634
635 return !!(tim->virtual_map[index] & mask);
636 }
637
638 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
639 u16 capab, bool erp_valid, u8 erp)
640 {
641 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
642 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
643 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
644 #endif
645 u32 changed = 0;
646 bool use_protection;
647 bool use_short_preamble;
648 bool use_short_slot;
649
650 if (erp_valid) {
651 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
652 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
653 } else {
654 use_protection = false;
655 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
656 }
657
658 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
659
660 if (use_protection != bss_conf->use_cts_prot) {
661 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
662 if (net_ratelimit()) {
663 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
664 sdata->dev->name,
665 use_protection ? "enabled" : "disabled",
666 ifsta->bssid);
667 }
668 #endif
669 bss_conf->use_cts_prot = use_protection;
670 changed |= BSS_CHANGED_ERP_CTS_PROT;
671 }
672
673 if (use_short_preamble != bss_conf->use_short_preamble) {
674 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
675 if (net_ratelimit()) {
676 printk(KERN_DEBUG "%s: switched to %s barker preamble"
677 " (BSSID=%pM)\n",
678 sdata->dev->name,
679 use_short_preamble ? "short" : "long",
680 ifsta->bssid);
681 }
682 #endif
683 bss_conf->use_short_preamble = use_short_preamble;
684 changed |= BSS_CHANGED_ERP_PREAMBLE;
685 }
686
687 if (use_short_slot != bss_conf->use_short_slot) {
688 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
689 if (net_ratelimit()) {
690 printk(KERN_DEBUG "%s: switched to %s slot time"
691 " (BSSID=%pM)\n",
692 sdata->dev->name,
693 use_short_slot ? "short" : "long",
694 ifsta->bssid);
695 }
696 #endif
697 bss_conf->use_short_slot = use_short_slot;
698 changed |= BSS_CHANGED_ERP_SLOT;
699 }
700
701 return changed;
702 }
703
704 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
705 struct ieee80211_if_sta *ifsta)
706 {
707 union iwreq_data wrqu;
708 memset(&wrqu, 0, sizeof(wrqu));
709 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
710 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
711 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
712 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
713 }
714
715 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
716 struct ieee80211_if_sta *ifsta)
717 {
718 char *buf;
719 size_t len;
720 int i;
721 union iwreq_data wrqu;
722
723 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
724 return;
725
726 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
727 ifsta->assocresp_ies_len), GFP_KERNEL);
728 if (!buf)
729 return;
730
731 len = sprintf(buf, "ASSOCINFO(");
732 if (ifsta->assocreq_ies) {
733 len += sprintf(buf + len, "ReqIEs=");
734 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
735 len += sprintf(buf + len, "%02x",
736 ifsta->assocreq_ies[i]);
737 }
738 }
739 if (ifsta->assocresp_ies) {
740 if (ifsta->assocreq_ies)
741 len += sprintf(buf + len, " ");
742 len += sprintf(buf + len, "RespIEs=");
743 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
744 len += sprintf(buf + len, "%02x",
745 ifsta->assocresp_ies[i]);
746 }
747 }
748 len += sprintf(buf + len, ")");
749
750 if (len > IW_CUSTOM_MAX) {
751 len = sprintf(buf, "ASSOCRESPIE=");
752 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
753 len += sprintf(buf + len, "%02x",
754 ifsta->assocresp_ies[i]);
755 }
756 }
757
758 if (len <= IW_CUSTOM_MAX) {
759 memset(&wrqu, 0, sizeof(wrqu));
760 wrqu.data.length = len;
761 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
762 }
763
764 kfree(buf);
765 }
766
767
768 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
769 struct ieee80211_if_sta *ifsta,
770 u32 bss_info_changed)
771 {
772 struct ieee80211_local *local = sdata->local;
773 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
774
775 struct ieee80211_bss *bss;
776
777 bss_info_changed |= BSS_CHANGED_ASSOC;
778 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
779
780 if (sdata->vif.type != NL80211_IFTYPE_STATION)
781 return;
782
783 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
784 conf->channel->center_freq,
785 ifsta->ssid, ifsta->ssid_len);
786 if (bss) {
787 /* set timing information */
788 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
789 sdata->vif.bss_conf.timestamp = bss->timestamp;
790 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
791
792 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
793 bss->capability, bss->has_erp_value, bss->erp_value);
794
795 ieee80211_rx_bss_put(local, bss);
796 }
797
798 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
799 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
800 ieee80211_sta_send_associnfo(sdata, ifsta);
801
802 ifsta->last_probe = jiffies;
803 ieee80211_led_assoc(local, 1);
804
805 sdata->vif.bss_conf.assoc = 1;
806 /*
807 * For now just always ask the driver to update the basic rateset
808 * when we have associated, we aren't checking whether it actually
809 * changed or not.
810 */
811 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
812 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
813
814 if (local->powersave) {
815 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
816 local->hw.conf.dynamic_ps_timeout > 0) {
817 mod_timer(&local->dynamic_ps_timer, jiffies +
818 msecs_to_jiffies(
819 local->hw.conf.dynamic_ps_timeout));
820 } else {
821 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
822 ieee80211_send_nullfunc(local, sdata, 1);
823 conf->flags |= IEEE80211_CONF_PS;
824 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
825 }
826 }
827
828 netif_tx_start_all_queues(sdata->dev);
829 netif_carrier_on(sdata->dev);
830
831 ieee80211_sta_send_apinfo(sdata, ifsta);
832 }
833
834 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
835 struct ieee80211_if_sta *ifsta)
836 {
837 ifsta->direct_probe_tries++;
838 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
839 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
840 sdata->dev->name, ifsta->bssid);
841 ifsta->state = IEEE80211_STA_MLME_DISABLED;
842 ieee80211_sta_send_apinfo(sdata, ifsta);
843 return;
844 }
845
846 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
847 sdata->dev->name, ifsta->bssid,
848 ifsta->direct_probe_tries);
849
850 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
851
852 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
853
854 /* Direct probe is sent to broadcast address as some APs
855 * will not answer to direct packet in unassociated state.
856 */
857 ieee80211_send_probe_req(sdata, NULL,
858 ifsta->ssid, ifsta->ssid_len);
859
860 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
861 }
862
863
864 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
865 struct ieee80211_if_sta *ifsta)
866 {
867 ifsta->auth_tries++;
868 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
869 printk(KERN_DEBUG "%s: authentication with AP %pM"
870 " timed out\n",
871 sdata->dev->name, ifsta->bssid);
872 ifsta->state = IEEE80211_STA_MLME_DISABLED;
873 ieee80211_sta_send_apinfo(sdata, ifsta);
874 return;
875 }
876
877 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
878 printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
879 sdata->dev->name, ifsta->bssid);
880
881 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
882
883 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
884 }
885
886 /*
887 * The disassoc 'reason' argument can be either our own reason
888 * if self disconnected or a reason code from the AP.
889 */
890 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
891 struct ieee80211_if_sta *ifsta, bool deauth,
892 bool self_disconnected, u16 reason)
893 {
894 struct ieee80211_local *local = sdata->local;
895 struct sta_info *sta;
896 u32 changed = 0, config_changed = 0;
897
898 rcu_read_lock();
899
900 sta = sta_info_get(local, ifsta->bssid);
901 if (!sta) {
902 rcu_read_unlock();
903 return;
904 }
905
906 if (deauth) {
907 ifsta->direct_probe_tries = 0;
908 ifsta->auth_tries = 0;
909 }
910 ifsta->assoc_scan_tries = 0;
911 ifsta->assoc_tries = 0;
912
913 netif_tx_stop_all_queues(sdata->dev);
914 netif_carrier_off(sdata->dev);
915
916 ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
917
918 if (self_disconnected) {
919 if (deauth)
920 ieee80211_send_deauth_disassoc(sdata,
921 IEEE80211_STYPE_DEAUTH, reason);
922 else
923 ieee80211_send_deauth_disassoc(sdata,
924 IEEE80211_STYPE_DISASSOC, reason);
925 }
926
927 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
928 changed |= ieee80211_reset_erp_info(sdata);
929
930 ieee80211_led_assoc(local, 0);
931 changed |= BSS_CHANGED_ASSOC;
932 sdata->vif.bss_conf.assoc = false;
933
934 ieee80211_sta_send_apinfo(sdata, ifsta);
935
936 if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
937 ifsta->state = IEEE80211_STA_MLME_DISABLED;
938
939 rcu_read_unlock();
940
941 /* channel(_type) changes are handled by ieee80211_hw_config */
942 local->oper_channel_type = NL80211_CHAN_NO_HT;
943
944 local->power_constr_level = 0;
945
946 del_timer_sync(&local->dynamic_ps_timer);
947 cancel_work_sync(&local->dynamic_ps_enable_work);
948
949 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
950 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
951 config_changed |= IEEE80211_CONF_CHANGE_PS;
952 }
953
954 ieee80211_hw_config(local, config_changed);
955 ieee80211_bss_info_change_notify(sdata, changed);
956
957 rcu_read_lock();
958
959 sta = sta_info_get(local, ifsta->bssid);
960 if (!sta) {
961 rcu_read_unlock();
962 return;
963 }
964
965 sta_info_unlink(&sta);
966
967 rcu_read_unlock();
968
969 sta_info_destroy(sta);
970 }
971
972 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
973 {
974 if (!sdata || !sdata->default_key ||
975 sdata->default_key->conf.alg != ALG_WEP)
976 return 0;
977 return 1;
978 }
979
980 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
981 struct ieee80211_if_sta *ifsta)
982 {
983 struct ieee80211_local *local = sdata->local;
984 struct ieee80211_bss *bss;
985 int bss_privacy;
986 int wep_privacy;
987 int privacy_invoked;
988
989 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
990 return 0;
991
992 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
993 local->hw.conf.channel->center_freq,
994 ifsta->ssid, ifsta->ssid_len);
995 if (!bss)
996 return 0;
997
998 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
999 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1000 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
1001
1002 ieee80211_rx_bss_put(local, bss);
1003
1004 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1005 return 0;
1006
1007 return 1;
1008 }
1009
1010 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1011 struct ieee80211_if_sta *ifsta)
1012 {
1013 ifsta->assoc_tries++;
1014 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1015 printk(KERN_DEBUG "%s: association with AP %pM"
1016 " timed out\n",
1017 sdata->dev->name, ifsta->bssid);
1018 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1019 ieee80211_sta_send_apinfo(sdata, ifsta);
1020 return;
1021 }
1022
1023 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1024 printk(KERN_DEBUG "%s: associate with AP %pM\n",
1025 sdata->dev->name, ifsta->bssid);
1026 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1027 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1028 "mixed-cell disabled - abort association\n", sdata->dev->name);
1029 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1030 return;
1031 }
1032
1033 ieee80211_send_assoc(sdata, ifsta);
1034
1035 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1036 }
1037
1038
1039 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1040 struct ieee80211_if_sta *ifsta)
1041 {
1042 struct ieee80211_local *local = sdata->local;
1043 struct sta_info *sta;
1044 int disassoc;
1045
1046 /* TODO: start monitoring current AP signal quality and number of
1047 * missed beacons. Scan other channels every now and then and search
1048 * for better APs. */
1049 /* TODO: remove expired BSSes */
1050
1051 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1052
1053 rcu_read_lock();
1054
1055 sta = sta_info_get(local, ifsta->bssid);
1056 if (!sta) {
1057 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1058 sdata->dev->name, ifsta->bssid);
1059 disassoc = 1;
1060 } else {
1061 disassoc = 0;
1062 if (time_after(jiffies,
1063 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1064 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1065 printk(KERN_DEBUG "%s: No ProbeResp from "
1066 "current AP %pM - assume out of "
1067 "range\n",
1068 sdata->dev->name, ifsta->bssid);
1069 disassoc = 1;
1070 } else
1071 ieee80211_send_probe_req(sdata, ifsta->bssid,
1072 ifsta->ssid,
1073 ifsta->ssid_len);
1074 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1075 } else {
1076 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1077 if (time_after(jiffies, ifsta->last_probe +
1078 IEEE80211_PROBE_INTERVAL)) {
1079 ifsta->last_probe = jiffies;
1080 ieee80211_send_probe_req(sdata, ifsta->bssid,
1081 ifsta->ssid,
1082 ifsta->ssid_len);
1083 }
1084 }
1085 }
1086
1087 rcu_read_unlock();
1088
1089 if (disassoc)
1090 ieee80211_set_disassoc(sdata, ifsta, true, true,
1091 WLAN_REASON_PREV_AUTH_NOT_VALID);
1092 else
1093 mod_timer(&ifsta->timer, jiffies +
1094 IEEE80211_MONITORING_INTERVAL);
1095 }
1096
1097
1098 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1099 struct ieee80211_if_sta *ifsta)
1100 {
1101 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1102 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1103 ieee80211_associate(sdata, ifsta);
1104 }
1105
1106
1107 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1108 struct ieee80211_if_sta *ifsta,
1109 struct ieee80211_mgmt *mgmt,
1110 size_t len)
1111 {
1112 u8 *pos;
1113 struct ieee802_11_elems elems;
1114
1115 pos = mgmt->u.auth.variable;
1116 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1117 if (!elems.challenge)
1118 return;
1119 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1120 elems.challenge_len + 2, 1);
1121 }
1122
1123 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1124 struct ieee80211_if_sta *ifsta,
1125 struct ieee80211_mgmt *mgmt,
1126 size_t len)
1127 {
1128 u16 auth_alg, auth_transaction, status_code;
1129
1130 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1131 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1132 return;
1133
1134 if (len < 24 + 6)
1135 return;
1136
1137 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1138 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1139 return;
1140
1141 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1142 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1143 return;
1144
1145 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1146 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1147 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1148
1149 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1150 /*
1151 * IEEE 802.11 standard does not require authentication in IBSS
1152 * networks and most implementations do not seem to use it.
1153 * However, try to reply to authentication attempts if someone
1154 * has actually implemented this.
1155 */
1156 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1157 return;
1158 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1159 }
1160
1161 if (auth_alg != ifsta->auth_alg ||
1162 auth_transaction != ifsta->auth_transaction)
1163 return;
1164
1165 if (status_code != WLAN_STATUS_SUCCESS) {
1166 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1167 u8 algs[3];
1168 const int num_algs = ARRAY_SIZE(algs);
1169 int i, pos;
1170 algs[0] = algs[1] = algs[2] = 0xff;
1171 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1172 algs[0] = WLAN_AUTH_OPEN;
1173 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1174 algs[1] = WLAN_AUTH_SHARED_KEY;
1175 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1176 algs[2] = WLAN_AUTH_LEAP;
1177 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1178 pos = 0;
1179 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1180 pos = 1;
1181 else
1182 pos = 2;
1183 for (i = 0; i < num_algs; i++) {
1184 pos++;
1185 if (pos >= num_algs)
1186 pos = 0;
1187 if (algs[pos] == ifsta->auth_alg ||
1188 algs[pos] == 0xff)
1189 continue;
1190 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1191 !ieee80211_sta_wep_configured(sdata))
1192 continue;
1193 ifsta->auth_alg = algs[pos];
1194 break;
1195 }
1196 }
1197 return;
1198 }
1199
1200 switch (ifsta->auth_alg) {
1201 case WLAN_AUTH_OPEN:
1202 case WLAN_AUTH_LEAP:
1203 ieee80211_auth_completed(sdata, ifsta);
1204 break;
1205 case WLAN_AUTH_SHARED_KEY:
1206 if (ifsta->auth_transaction == 4)
1207 ieee80211_auth_completed(sdata, ifsta);
1208 else
1209 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1210 break;
1211 }
1212 }
1213
1214
1215 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1216 struct ieee80211_if_sta *ifsta,
1217 struct ieee80211_mgmt *mgmt,
1218 size_t len)
1219 {
1220 u16 reason_code;
1221
1222 if (len < 24 + 2)
1223 return;
1224
1225 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1226 return;
1227
1228 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1229
1230 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1231 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1232 sdata->dev->name, reason_code);
1233
1234 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1235 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1236 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1237 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1238 mod_timer(&ifsta->timer, jiffies +
1239 IEEE80211_RETRY_AUTH_INTERVAL);
1240 }
1241
1242 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1243 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1244 }
1245
1246
1247 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1248 struct ieee80211_if_sta *ifsta,
1249 struct ieee80211_mgmt *mgmt,
1250 size_t len)
1251 {
1252 u16 reason_code;
1253
1254 if (len < 24 + 2)
1255 return;
1256
1257 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1258 return;
1259
1260 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1261
1262 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1263 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1264 sdata->dev->name, reason_code);
1265
1266 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1267 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1268 mod_timer(&ifsta->timer, jiffies +
1269 IEEE80211_RETRY_AUTH_INTERVAL);
1270 }
1271
1272 ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1273 }
1274
1275
1276 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1277 struct ieee80211_if_sta *ifsta,
1278 struct ieee80211_mgmt *mgmt,
1279 size_t len,
1280 int reassoc)
1281 {
1282 struct ieee80211_local *local = sdata->local;
1283 struct ieee80211_supported_band *sband;
1284 struct sta_info *sta;
1285 u64 rates, basic_rates;
1286 u16 capab_info, status_code, aid;
1287 struct ieee802_11_elems elems;
1288 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1289 u8 *pos;
1290 u32 changed = 0;
1291 int i, j;
1292 bool have_higher_than_11mbit = false, newsta = false;
1293 u16 ap_ht_cap_flags;
1294
1295 /* AssocResp and ReassocResp have identical structure, so process both
1296 * of them in this function. */
1297
1298 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1299 return;
1300
1301 if (len < 24 + 6)
1302 return;
1303
1304 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1305 return;
1306
1307 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1308 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1309 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1310
1311 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1312 "status=%d aid=%d)\n",
1313 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1314 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1315
1316 pos = mgmt->u.assoc_resp.variable;
1317 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1318
1319 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1320 elems.timeout_int && elems.timeout_int_len == 5 &&
1321 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1322 u32 tu, ms;
1323 tu = get_unaligned_le32(elems.timeout_int + 1);
1324 ms = tu * 1024 / 1000;
1325 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1326 "comeback duration %u TU (%u ms)\n",
1327 sdata->dev->name, tu, ms);
1328 if (ms > IEEE80211_ASSOC_TIMEOUT)
1329 mod_timer(&ifsta->timer,
1330 jiffies + msecs_to_jiffies(ms));
1331 return;
1332 }
1333
1334 if (status_code != WLAN_STATUS_SUCCESS) {
1335 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1336 sdata->dev->name, status_code);
1337 /* if this was a reassociation, ensure we try a "full"
1338 * association next time. This works around some broken APs
1339 * which do not correctly reject reassociation requests. */
1340 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1341 return;
1342 }
1343
1344 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1345 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1346 "set\n", sdata->dev->name, aid);
1347 aid &= ~(BIT(15) | BIT(14));
1348
1349 if (!elems.supp_rates) {
1350 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1351 sdata->dev->name);
1352 return;
1353 }
1354
1355 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1356 ifsta->aid = aid;
1357 ifsta->ap_capab = capab_info;
1358
1359 kfree(ifsta->assocresp_ies);
1360 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1361 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1362 if (ifsta->assocresp_ies)
1363 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1364
1365 rcu_read_lock();
1366
1367 /* Add STA entry for the AP */
1368 sta = sta_info_get(local, ifsta->bssid);
1369 if (!sta) {
1370 struct ieee80211_bss *bss;
1371
1372 newsta = true;
1373
1374 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1375 if (!sta) {
1376 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1377 " the AP\n", sdata->dev->name);
1378 rcu_read_unlock();
1379 return;
1380 }
1381 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1382 local->hw.conf.channel->center_freq,
1383 ifsta->ssid, ifsta->ssid_len);
1384 if (bss) {
1385 sta->last_signal = bss->signal;
1386 sta->last_qual = bss->qual;
1387 sta->last_noise = bss->noise;
1388 ieee80211_rx_bss_put(local, bss);
1389 }
1390
1391 /* update new sta with its last rx activity */
1392 sta->last_rx = jiffies;
1393 }
1394
1395 /*
1396 * FIXME: Do we really need to update the sta_info's information here?
1397 * We already know about the AP (we found it in our list) so it
1398 * should already be filled with the right info, no?
1399 * As is stands, all this is racy because typically we assume
1400 * the information that is filled in here (except flags) doesn't
1401 * change while a STA structure is alive. As such, it should move
1402 * to between the sta_info_alloc() and sta_info_insert() above.
1403 */
1404
1405 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1406 WLAN_STA_AUTHORIZED);
1407
1408 rates = 0;
1409 basic_rates = 0;
1410 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1411
1412 for (i = 0; i < elems.supp_rates_len; i++) {
1413 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1414 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1415
1416 if (rate > 110)
1417 have_higher_than_11mbit = true;
1418
1419 for (j = 0; j < sband->n_bitrates; j++) {
1420 if (sband->bitrates[j].bitrate == rate) {
1421 rates |= BIT(j);
1422 if (is_basic)
1423 basic_rates |= BIT(j);
1424 break;
1425 }
1426 }
1427 }
1428
1429 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1430 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1431 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1432
1433 if (rate > 110)
1434 have_higher_than_11mbit = true;
1435
1436 for (j = 0; j < sband->n_bitrates; j++) {
1437 if (sband->bitrates[j].bitrate == rate) {
1438 rates |= BIT(j);
1439 if (is_basic)
1440 basic_rates |= BIT(j);
1441 break;
1442 }
1443 }
1444 }
1445
1446 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1447 sdata->vif.bss_conf.basic_rates = basic_rates;
1448
1449 /* cf. IEEE 802.11 9.2.12 */
1450 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1451 have_higher_than_11mbit)
1452 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1453 else
1454 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1455
1456 if (elems.ht_cap_elem)
1457 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1458 elems.ht_cap_elem, &sta->sta.ht_cap);
1459
1460 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1461
1462 rate_control_rate_init(sta);
1463
1464 if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
1465 set_sta_flags(sta, WLAN_STA_MFP);
1466
1467 if (elems.wmm_param)
1468 set_sta_flags(sta, WLAN_STA_WME);
1469
1470 if (newsta) {
1471 int err = sta_info_insert(sta);
1472 if (err) {
1473 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1474 " the AP (error %d)\n", sdata->dev->name, err);
1475 rcu_read_unlock();
1476 return;
1477 }
1478 }
1479
1480 rcu_read_unlock();
1481
1482 if (elems.wmm_param)
1483 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1484 elems.wmm_param_len);
1485
1486 if (elems.ht_info_elem && elems.wmm_param &&
1487 (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1488 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1489 ap_ht_cap_flags);
1490
1491 /* set AID and assoc capability,
1492 * ieee80211_set_associated() will tell the driver */
1493 bss_conf->aid = aid;
1494 bss_conf->assoc_capability = capab_info;
1495 ieee80211_set_associated(sdata, ifsta, changed);
1496
1497 ieee80211_associated(sdata, ifsta);
1498 }
1499
1500
1501 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1502 struct ieee80211_if_sta *ifsta,
1503 struct ieee80211_bss *bss)
1504 {
1505 struct ieee80211_local *local = sdata->local;
1506 int res, rates, i, j;
1507 struct sk_buff *skb;
1508 struct ieee80211_mgmt *mgmt;
1509 u8 *pos;
1510 struct ieee80211_supported_band *sband;
1511 union iwreq_data wrqu;
1512
1513 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
1514 sdata->u.sta.ie_proberesp_len);
1515 if (!skb) {
1516 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1517 "response\n", sdata->dev->name);
1518 return -ENOMEM;
1519 }
1520
1521 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1522
1523 /* Remove possible STA entries from other IBSS networks. */
1524 sta_info_flush_delayed(sdata);
1525
1526 if (local->ops->reset_tsf) {
1527 /* Reset own TSF to allow time synchronization work. */
1528 local->ops->reset_tsf(local_to_hw(local));
1529 }
1530 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1531 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1532 if (res)
1533 return res;
1534
1535 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1536
1537 sdata->drop_unencrypted = bss->capability &
1538 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1539
1540 res = ieee80211_set_freq(sdata, bss->freq);
1541
1542 if (res)
1543 return res;
1544
1545 /* Build IBSS probe response */
1546
1547 skb_reserve(skb, local->hw.extra_tx_headroom);
1548
1549 mgmt = (struct ieee80211_mgmt *)
1550 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1551 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1552 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1553 IEEE80211_STYPE_PROBE_RESP);
1554 memset(mgmt->da, 0xff, ETH_ALEN);
1555 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1556 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1557 mgmt->u.beacon.beacon_int =
1558 cpu_to_le16(local->hw.conf.beacon_int);
1559 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1560 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1561
1562 pos = skb_put(skb, 2 + ifsta->ssid_len);
1563 *pos++ = WLAN_EID_SSID;
1564 *pos++ = ifsta->ssid_len;
1565 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1566
1567 rates = bss->supp_rates_len;
1568 if (rates > 8)
1569 rates = 8;
1570 pos = skb_put(skb, 2 + rates);
1571 *pos++ = WLAN_EID_SUPP_RATES;
1572 *pos++ = rates;
1573 memcpy(pos, bss->supp_rates, rates);
1574
1575 if (bss->band == IEEE80211_BAND_2GHZ) {
1576 pos = skb_put(skb, 2 + 1);
1577 *pos++ = WLAN_EID_DS_PARAMS;
1578 *pos++ = 1;
1579 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1580 }
1581
1582 pos = skb_put(skb, 2 + 2);
1583 *pos++ = WLAN_EID_IBSS_PARAMS;
1584 *pos++ = 2;
1585 /* FIX: set ATIM window based on scan results */
1586 *pos++ = 0;
1587 *pos++ = 0;
1588
1589 if (bss->supp_rates_len > 8) {
1590 rates = bss->supp_rates_len - 8;
1591 pos = skb_put(skb, 2 + rates);
1592 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1593 *pos++ = rates;
1594 memcpy(pos, &bss->supp_rates[8], rates);
1595 }
1596
1597 add_extra_ies(skb, sdata->u.sta.ie_proberesp,
1598 sdata->u.sta.ie_proberesp_len);
1599
1600 ifsta->probe_resp = skb;
1601
1602 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1603
1604
1605 rates = 0;
1606 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1607 for (i = 0; i < bss->supp_rates_len; i++) {
1608 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1609 for (j = 0; j < sband->n_bitrates; j++)
1610 if (sband->bitrates[j].bitrate == bitrate)
1611 rates |= BIT(j);
1612 }
1613 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1614
1615 ieee80211_sta_def_wmm_params(sdata, bss);
1616
1617 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1618 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1619
1620 ieee80211_led_assoc(local, true);
1621
1622 memset(&wrqu, 0, sizeof(wrqu));
1623 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1624 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1625
1626 return res;
1627 }
1628
1629 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1630 struct ieee80211_mgmt *mgmt,
1631 size_t len,
1632 struct ieee80211_rx_status *rx_status,
1633 struct ieee802_11_elems *elems,
1634 bool beacon)
1635 {
1636 struct ieee80211_local *local = sdata->local;
1637 int freq;
1638 struct ieee80211_bss *bss;
1639 struct sta_info *sta;
1640 struct ieee80211_channel *channel;
1641 u64 beacon_timestamp, rx_timestamp;
1642 u64 supp_rates = 0;
1643 enum ieee80211_band band = rx_status->band;
1644
1645 if (elems->ds_params && elems->ds_params_len == 1)
1646 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1647 else
1648 freq = rx_status->freq;
1649
1650 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1651
1652 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1653 return;
1654
1655 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1656 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1657 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1658
1659 rcu_read_lock();
1660
1661 sta = sta_info_get(local, mgmt->sa);
1662 if (sta) {
1663 u64 prev_rates;
1664
1665 prev_rates = sta->sta.supp_rates[band];
1666 /* make sure mandatory rates are always added */
1667 sta->sta.supp_rates[band] = supp_rates |
1668 ieee80211_mandatory_rates(local, band);
1669
1670 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1671 if (sta->sta.supp_rates[band] != prev_rates)
1672 printk(KERN_DEBUG "%s: updated supp_rates set "
1673 "for %pM based on beacon info (0x%llx | "
1674 "0x%llx -> 0x%llx)\n",
1675 sdata->dev->name,
1676 sta->sta.addr,
1677 (unsigned long long) prev_rates,
1678 (unsigned long long) supp_rates,
1679 (unsigned long long) sta->sta.supp_rates[band]);
1680 #endif
1681 } else {
1682 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1683 }
1684
1685 rcu_read_unlock();
1686 }
1687
1688 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1689 freq, beacon);
1690 if (!bss)
1691 return;
1692
1693 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1694 (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1695 struct ieee80211_channel_sw_ie *sw_elem =
1696 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1697 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1698 }
1699
1700 /* was just updated in ieee80211_bss_info_update */
1701 beacon_timestamp = bss->timestamp;
1702
1703 /*
1704 * In STA mode, the remaining parameters should not be overridden
1705 * by beacons because they're not necessarily accurate there.
1706 */
1707 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1708 bss->last_probe_resp && beacon) {
1709 ieee80211_rx_bss_put(local, bss);
1710 return;
1711 }
1712
1713 /* check if we need to merge IBSS */
1714 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1715 (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1716 bss->capability & WLAN_CAPABILITY_IBSS &&
1717 bss->freq == local->oper_channel->center_freq &&
1718 elems->ssid_len == sdata->u.sta.ssid_len &&
1719 memcmp(elems->ssid, sdata->u.sta.ssid,
1720 sdata->u.sta.ssid_len) == 0) {
1721 if (rx_status->flag & RX_FLAG_TSFT) {
1722 /* in order for correct IBSS merging we need mactime
1723 *
1724 * since mactime is defined as the time the first data
1725 * symbol of the frame hits the PHY, and the timestamp
1726 * of the beacon is defined as "the time that the data
1727 * symbol containing the first bit of the timestamp is
1728 * transmitted to the PHY plus the transmitting STA’s
1729 * delays through its local PHY from the MAC-PHY
1730 * interface to its interface with the WM"
1731 * (802.11 11.1.2) - equals the time this bit arrives at
1732 * the receiver - we have to take into account the
1733 * offset between the two.
1734 * e.g: at 1 MBit that means mactime is 192 usec earlier
1735 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1736 */
1737 int rate;
1738 if (rx_status->flag & RX_FLAG_HT) {
1739 rate = 65; /* TODO: HT rates */
1740 } else {
1741 rate = local->hw.wiphy->bands[band]->
1742 bitrates[rx_status->rate_idx].bitrate;
1743 }
1744 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1745 } else if (local && local->ops && local->ops->get_tsf)
1746 /* second best option: get current TSF */
1747 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1748 else
1749 /* can't merge without knowing the TSF */
1750 rx_timestamp = -1LLU;
1751 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1752 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1753 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1754 mgmt->sa, mgmt->bssid,
1755 (unsigned long long)rx_timestamp,
1756 (unsigned long long)beacon_timestamp,
1757 (unsigned long long)(rx_timestamp - beacon_timestamp),
1758 jiffies);
1759 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1760 if (beacon_timestamp > rx_timestamp) {
1761 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1762 printk(KERN_DEBUG "%s: beacon TSF higher than "
1763 "local TSF - IBSS merge with BSSID %pM\n",
1764 sdata->dev->name, mgmt->bssid);
1765 #endif
1766 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1767 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1768 }
1769 }
1770
1771 ieee80211_rx_bss_put(local, bss);
1772 }
1773
1774
1775 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1776 struct ieee80211_mgmt *mgmt,
1777 size_t len,
1778 struct ieee80211_rx_status *rx_status)
1779 {
1780 size_t baselen;
1781 struct ieee802_11_elems elems;
1782 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1783
1784 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1785 return; /* ignore ProbeResp to foreign address */
1786
1787 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1788 if (baselen > len)
1789 return;
1790
1791 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1792 &elems);
1793
1794 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1795
1796 /* direct probe may be part of the association flow */
1797 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1798 &ifsta->request)) {
1799 printk(KERN_DEBUG "%s direct probe responded\n",
1800 sdata->dev->name);
1801 ieee80211_authenticate(sdata, ifsta);
1802 }
1803 }
1804
1805
1806 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1807 struct ieee80211_mgmt *mgmt,
1808 size_t len,
1809 struct ieee80211_rx_status *rx_status)
1810 {
1811 struct ieee80211_if_sta *ifsta;
1812 size_t baselen;
1813 struct ieee802_11_elems elems;
1814 struct ieee80211_local *local = sdata->local;
1815 u32 changed = 0;
1816 bool erp_valid, directed_tim, is_mc = false;
1817 u8 erp_value = 0;
1818
1819 /* Process beacon from the current BSS */
1820 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1821 if (baselen > len)
1822 return;
1823
1824 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1825
1826 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1827
1828 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1829 return;
1830 ifsta = &sdata->u.sta;
1831
1832 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1833 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1834 return;
1835
1836 if (rx_status->freq != local->hw.conf.channel->center_freq)
1837 return;
1838
1839 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1840 elems.wmm_param_len);
1841
1842 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1843 local->hw.conf.flags & IEEE80211_CONF_PS) {
1844 directed_tim = check_tim(&elems, ifsta->aid, &is_mc);
1845
1846 if (directed_tim || is_mc) {
1847 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1848 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1849 ieee80211_send_nullfunc(local, sdata, 0);
1850 }
1851 }
1852
1853 if (elems.erp_info && elems.erp_info_len >= 1) {
1854 erp_valid = true;
1855 erp_value = elems.erp_info[0];
1856 } else {
1857 erp_valid = false;
1858 }
1859 changed |= ieee80211_handle_bss_capability(sdata,
1860 le16_to_cpu(mgmt->u.beacon.capab_info),
1861 erp_valid, erp_value);
1862
1863
1864 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1865 struct sta_info *sta;
1866 struct ieee80211_supported_band *sband;
1867 u16 ap_ht_cap_flags;
1868
1869 rcu_read_lock();
1870
1871 sta = sta_info_get(local, ifsta->bssid);
1872 if (!sta) {
1873 rcu_read_unlock();
1874 return;
1875 }
1876
1877 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1878
1879 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1880 elems.ht_cap_elem, &sta->sta.ht_cap);
1881
1882 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1883
1884 rcu_read_unlock();
1885
1886 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1887 ap_ht_cap_flags);
1888 }
1889
1890 if (elems.country_elem) {
1891 /* Note we are only reviewing this on beacons
1892 * for the BSSID we are associated to */
1893 regulatory_hint_11d(local->hw.wiphy,
1894 elems.country_elem, elems.country_elem_len);
1895
1896 /* TODO: IBSS also needs this */
1897 if (elems.pwr_constr_elem)
1898 ieee80211_handle_pwr_constr(sdata,
1899 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1900 elems.pwr_constr_elem,
1901 elems.pwr_constr_elem_len);
1902 }
1903
1904 ieee80211_bss_info_change_notify(sdata, changed);
1905 }
1906
1907
1908 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1909 struct ieee80211_if_sta *ifsta,
1910 struct ieee80211_mgmt *mgmt,
1911 size_t len)
1912 {
1913 struct ieee80211_local *local = sdata->local;
1914 int tx_last_beacon;
1915 struct sk_buff *skb;
1916 struct ieee80211_mgmt *resp;
1917 u8 *pos, *end;
1918
1919 if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1920 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1921 len < 24 + 2 || !ifsta->probe_resp)
1922 return;
1923
1924 if (local->ops->tx_last_beacon)
1925 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1926 else
1927 tx_last_beacon = 1;
1928
1929 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1930 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1931 " (tx_last_beacon=%d)\n",
1932 sdata->dev->name, mgmt->sa, mgmt->da,
1933 mgmt->bssid, tx_last_beacon);
1934 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1935
1936 if (!tx_last_beacon)
1937 return;
1938
1939 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1940 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1941 return;
1942
1943 end = ((u8 *) mgmt) + len;
1944 pos = mgmt->u.probe_req.variable;
1945 if (pos[0] != WLAN_EID_SSID ||
1946 pos + 2 + pos[1] > end) {
1947 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1948 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1949 "from %pM\n",
1950 sdata->dev->name, mgmt->sa);
1951 #endif
1952 return;
1953 }
1954 if (pos[1] != 0 &&
1955 (pos[1] != ifsta->ssid_len ||
1956 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1957 /* Ignore ProbeReq for foreign SSID */
1958 return;
1959 }
1960
1961 /* Reply with ProbeResp */
1962 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1963 if (!skb)
1964 return;
1965
1966 resp = (struct ieee80211_mgmt *) skb->data;
1967 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1968 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1969 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1970 sdata->dev->name, resp->da);
1971 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1972 ieee80211_tx_skb(sdata, skb, 0);
1973 }
1974
1975 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1976 struct ieee80211_rx_status *rx_status)
1977 {
1978 struct ieee80211_local *local = sdata->local;
1979 struct ieee80211_if_sta *ifsta;
1980 struct ieee80211_mgmt *mgmt;
1981 u16 fc;
1982
1983 if (skb->len < 24)
1984 goto fail;
1985
1986 ifsta = &sdata->u.sta;
1987
1988 mgmt = (struct ieee80211_mgmt *) skb->data;
1989 fc = le16_to_cpu(mgmt->frame_control);
1990
1991 switch (fc & IEEE80211_FCTL_STYPE) {
1992 case IEEE80211_STYPE_PROBE_REQ:
1993 case IEEE80211_STYPE_PROBE_RESP:
1994 case IEEE80211_STYPE_BEACON:
1995 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1996 case IEEE80211_STYPE_AUTH:
1997 case IEEE80211_STYPE_ASSOC_RESP:
1998 case IEEE80211_STYPE_REASSOC_RESP:
1999 case IEEE80211_STYPE_DEAUTH:
2000 case IEEE80211_STYPE_DISASSOC:
2001 skb_queue_tail(&ifsta->skb_queue, skb);
2002 queue_work(local->hw.workqueue, &ifsta->work);
2003 return;
2004 }
2005
2006 fail:
2007 kfree_skb(skb);
2008 }
2009
2010 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2011 struct sk_buff *skb)
2012 {
2013 struct ieee80211_rx_status *rx_status;
2014 struct ieee80211_if_sta *ifsta;
2015 struct ieee80211_mgmt *mgmt;
2016 u16 fc;
2017
2018 ifsta = &sdata->u.sta;
2019
2020 rx_status = (struct ieee80211_rx_status *) skb->cb;
2021 mgmt = (struct ieee80211_mgmt *) skb->data;
2022 fc = le16_to_cpu(mgmt->frame_control);
2023
2024 switch (fc & IEEE80211_FCTL_STYPE) {
2025 case IEEE80211_STYPE_PROBE_REQ:
2026 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
2027 break;
2028 case IEEE80211_STYPE_PROBE_RESP:
2029 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
2030 break;
2031 case IEEE80211_STYPE_BEACON:
2032 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2033 break;
2034 case IEEE80211_STYPE_AUTH:
2035 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2036 break;
2037 case IEEE80211_STYPE_ASSOC_RESP:
2038 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2039 break;
2040 case IEEE80211_STYPE_REASSOC_RESP:
2041 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2042 break;
2043 case IEEE80211_STYPE_DEAUTH:
2044 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2045 break;
2046 case IEEE80211_STYPE_DISASSOC:
2047 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2048 break;
2049 }
2050
2051 kfree_skb(skb);
2052 }
2053
2054
2055 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
2056 {
2057 struct ieee80211_local *local = sdata->local;
2058 int active = 0;
2059 struct sta_info *sta;
2060
2061 rcu_read_lock();
2062
2063 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2064 if (sta->sdata == sdata &&
2065 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2066 jiffies)) {
2067 active++;
2068 break;
2069 }
2070 }
2071
2072 rcu_read_unlock();
2073
2074 return active;
2075 }
2076
2077
2078 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2079 struct ieee80211_if_sta *ifsta)
2080 {
2081 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2082
2083 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2084 if (ieee80211_sta_active_ibss(sdata))
2085 return;
2086
2087 if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2088 (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2089 return;
2090
2091 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2092 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2093 ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
2094 }
2095
2096
2097 static void ieee80211_sta_timer(unsigned long data)
2098 {
2099 struct ieee80211_sub_if_data *sdata =
2100 (struct ieee80211_sub_if_data *) data;
2101 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2102 struct ieee80211_local *local = sdata->local;
2103
2104 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2105 queue_work(local->hw.workqueue, &ifsta->work);
2106 }
2107
2108 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2109 struct ieee80211_if_sta *ifsta)
2110 {
2111 struct ieee80211_local *local = sdata->local;
2112
2113 if (local->ops->reset_tsf) {
2114 /* Reset own TSF to allow time synchronization work. */
2115 local->ops->reset_tsf(local_to_hw(local));
2116 }
2117
2118 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2119
2120
2121 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2122 ifsta->auth_alg = WLAN_AUTH_OPEN;
2123 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2124 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2125 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2126 ifsta->auth_alg = WLAN_AUTH_LEAP;
2127 else
2128 ifsta->auth_alg = WLAN_AUTH_OPEN;
2129 ifsta->auth_transaction = -1;
2130 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2131 ifsta->assoc_scan_tries = 0;
2132 ifsta->direct_probe_tries = 0;
2133 ifsta->auth_tries = 0;
2134 ifsta->assoc_tries = 0;
2135 netif_tx_stop_all_queues(sdata->dev);
2136 netif_carrier_off(sdata->dev);
2137 }
2138
2139
2140 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2141 const char *ssid, int ssid_len)
2142 {
2143 int tmp, hidden_ssid;
2144
2145 if (ssid_len == ifsta->ssid_len &&
2146 !memcmp(ifsta->ssid, ssid, ssid_len))
2147 return 1;
2148
2149 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2150 return 0;
2151
2152 hidden_ssid = 1;
2153 tmp = ssid_len;
2154 while (tmp--) {
2155 if (ssid[tmp] != '\0') {
2156 hidden_ssid = 0;
2157 break;
2158 }
2159 }
2160
2161 if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2162 return 1;
2163
2164 if (ssid_len == 1 && ssid[0] == ' ')
2165 return 1;
2166
2167 return 0;
2168 }
2169
2170 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2171 struct ieee80211_if_sta *ifsta)
2172 {
2173 struct ieee80211_local *local = sdata->local;
2174 struct ieee80211_bss *bss;
2175 struct ieee80211_supported_band *sband;
2176 u8 bssid[ETH_ALEN], *pos;
2177 int i;
2178 int ret;
2179
2180 #if 0
2181 /* Easier testing, use fixed BSSID. */
2182 memset(bssid, 0xfe, ETH_ALEN);
2183 #else
2184 /* Generate random, not broadcast, locally administered BSSID. Mix in
2185 * own MAC address to make sure that devices that do not have proper
2186 * random number generator get different BSSID. */
2187 get_random_bytes(bssid, ETH_ALEN);
2188 for (i = 0; i < ETH_ALEN; i++)
2189 bssid[i] ^= sdata->dev->dev_addr[i];
2190 bssid[0] &= ~0x01;
2191 bssid[0] |= 0x02;
2192 #endif
2193
2194 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2195 sdata->dev->name, bssid);
2196
2197 bss = ieee80211_rx_bss_add(local, bssid,
2198 local->hw.conf.channel->center_freq,
2199 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2200 if (!bss)
2201 return -ENOMEM;
2202
2203 bss->band = local->hw.conf.channel->band;
2204 sband = local->hw.wiphy->bands[bss->band];
2205
2206 if (local->hw.conf.beacon_int == 0)
2207 local->hw.conf.beacon_int = 100;
2208 bss->beacon_int = local->hw.conf.beacon_int;
2209 bss->last_update = jiffies;
2210 bss->capability = WLAN_CAPABILITY_IBSS;
2211
2212 if (sdata->default_key)
2213 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2214 else
2215 sdata->drop_unencrypted = 0;
2216
2217 bss->supp_rates_len = sband->n_bitrates;
2218 pos = bss->supp_rates;
2219 for (i = 0; i < sband->n_bitrates; i++) {
2220 int rate = sband->bitrates[i].bitrate;
2221 *pos++ = (u8) (rate / 5);
2222 }
2223
2224 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2225 ieee80211_rx_bss_put(local, bss);
2226 return ret;
2227 }
2228
2229
2230 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2231 struct ieee80211_if_sta *ifsta)
2232 {
2233 struct ieee80211_local *local = sdata->local;
2234 struct ieee80211_bss *bss;
2235 int found = 0;
2236 u8 bssid[ETH_ALEN];
2237 int active_ibss;
2238
2239 if (ifsta->ssid_len == 0)
2240 return -EINVAL;
2241
2242 active_ibss = ieee80211_sta_active_ibss(sdata);
2243 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2244 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2245 sdata->dev->name, active_ibss);
2246 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2247 spin_lock_bh(&local->bss_lock);
2248 list_for_each_entry(bss, &local->bss_list, list) {
2249 if (ifsta->ssid_len != bss->ssid_len ||
2250 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2251 || !(bss->capability & WLAN_CAPABILITY_IBSS))
2252 continue;
2253 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2254 printk(KERN_DEBUG " bssid=%pM found\n", bss->bssid);
2255 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2256 memcpy(bssid, bss->bssid, ETH_ALEN);
2257 found = 1;
2258 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2259 break;
2260 }
2261 spin_unlock_bh(&local->bss_lock);
2262
2263 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2264 if (found)
2265 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
2266 "%pM\n", bssid, ifsta->bssid);
2267 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2268
2269 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2270 int ret;
2271 int search_freq;
2272
2273 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2274 search_freq = bss->freq;
2275 else
2276 search_freq = local->hw.conf.channel->center_freq;
2277
2278 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2279 ifsta->ssid, ifsta->ssid_len);
2280 if (!bss)
2281 goto dont_join;
2282
2283 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2284 " based on configured SSID\n",
2285 sdata->dev->name, bssid);
2286 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2287 ieee80211_rx_bss_put(local, bss);
2288 return ret;
2289 }
2290
2291 dont_join:
2292 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2293 printk(KERN_DEBUG " did not try to join ibss\n");
2294 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2295
2296 /* Selected IBSS not found in current scan results - try to scan */
2297 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2298 !ieee80211_sta_active_ibss(sdata)) {
2299 mod_timer(&ifsta->timer, jiffies +
2300 IEEE80211_IBSS_MERGE_INTERVAL);
2301 } else if (time_after(jiffies, local->last_scan_completed +
2302 IEEE80211_SCAN_INTERVAL)) {
2303 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2304 "join\n", sdata->dev->name);
2305 return ieee80211_request_scan(sdata, ifsta->ssid,
2306 ifsta->ssid_len);
2307 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2308 int interval = IEEE80211_SCAN_INTERVAL;
2309
2310 if (time_after(jiffies, ifsta->ibss_join_req +
2311 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2312 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2313 (!(local->oper_channel->flags &
2314 IEEE80211_CHAN_NO_IBSS)))
2315 return ieee80211_sta_create_ibss(sdata, ifsta);
2316 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2317 printk(KERN_DEBUG "%s: IBSS not allowed on"
2318 " %d MHz\n", sdata->dev->name,
2319 local->hw.conf.channel->center_freq);
2320 }
2321
2322 /* No IBSS found - decrease scan interval and continue
2323 * scanning. */
2324 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2325 }
2326
2327 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2328 mod_timer(&ifsta->timer, jiffies + interval);
2329 return 0;
2330 }
2331
2332 return 0;
2333 }
2334
2335
2336 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2337 struct ieee80211_if_sta *ifsta)
2338 {
2339 struct ieee80211_local *local = sdata->local;
2340 struct ieee80211_bss *bss, *selected = NULL;
2341 int top_rssi = 0, freq;
2342
2343 spin_lock_bh(&local->bss_lock);
2344 freq = local->oper_channel->center_freq;
2345 list_for_each_entry(bss, &local->bss_list, list) {
2346 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2347 continue;
2348
2349 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2350 IEEE80211_STA_AUTO_BSSID_SEL |
2351 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2352 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2353 !!sdata->default_key))
2354 continue;
2355
2356 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2357 bss->freq != freq)
2358 continue;
2359
2360 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2361 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2362 continue;
2363
2364 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2365 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2366 continue;
2367
2368 if (!selected || top_rssi < bss->signal) {
2369 selected = bss;
2370 top_rssi = bss->signal;
2371 }
2372 }
2373 if (selected)
2374 atomic_inc(&selected->users);
2375 spin_unlock_bh(&local->bss_lock);
2376
2377 if (selected) {
2378 ieee80211_set_freq(sdata, selected->freq);
2379 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2380 ieee80211_sta_set_ssid(sdata, selected->ssid,
2381 selected->ssid_len);
2382 ieee80211_sta_set_bssid(sdata, selected->bssid);
2383 ieee80211_sta_def_wmm_params(sdata, selected);
2384 if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
2385 sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
2386 else
2387 sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
2388
2389 /* Send out direct probe if no probe resp was received or
2390 * the one we have is outdated
2391 */
2392 if (!selected->last_probe_resp ||
2393 time_after(jiffies, selected->last_probe_resp
2394 + IEEE80211_SCAN_RESULT_EXPIRE))
2395 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2396 else
2397 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2398
2399 ieee80211_rx_bss_put(local, selected);
2400 ieee80211_sta_reset_auth(sdata, ifsta);
2401 return 0;
2402 } else {
2403 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2404 ifsta->assoc_scan_tries++;
2405 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2406 ieee80211_start_scan(sdata, NULL, 0);
2407 else
2408 ieee80211_start_scan(sdata, ifsta->ssid,
2409 ifsta->ssid_len);
2410 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2411 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2412 } else
2413 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2414 }
2415 return -1;
2416 }
2417
2418
2419 static void ieee80211_sta_work(struct work_struct *work)
2420 {
2421 struct ieee80211_sub_if_data *sdata =
2422 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2423 struct ieee80211_local *local = sdata->local;
2424 struct ieee80211_if_sta *ifsta;
2425 struct sk_buff *skb;
2426
2427 if (!netif_running(sdata->dev))
2428 return;
2429
2430 if (local->sw_scanning || local->hw_scanning)
2431 return;
2432
2433 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2434 sdata->vif.type != NL80211_IFTYPE_ADHOC))
2435 return;
2436 ifsta = &sdata->u.sta;
2437
2438 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2439 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2440
2441 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2442 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2443 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2444 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2445 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2446 ifsta->scan_ssid_len);
2447 return;
2448 }
2449
2450 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2451 if (ieee80211_sta_config_auth(sdata, ifsta))
2452 return;
2453 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2454 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2455 return;
2456
2457 switch (ifsta->state) {
2458 case IEEE80211_STA_MLME_DISABLED:
2459 break;
2460 case IEEE80211_STA_MLME_DIRECT_PROBE:
2461 ieee80211_direct_probe(sdata, ifsta);
2462 break;
2463 case IEEE80211_STA_MLME_AUTHENTICATE:
2464 ieee80211_authenticate(sdata, ifsta);
2465 break;
2466 case IEEE80211_STA_MLME_ASSOCIATE:
2467 ieee80211_associate(sdata, ifsta);
2468 break;
2469 case IEEE80211_STA_MLME_ASSOCIATED:
2470 ieee80211_associated(sdata, ifsta);
2471 break;
2472 case IEEE80211_STA_MLME_IBSS_SEARCH:
2473 ieee80211_sta_find_ibss(sdata, ifsta);
2474 break;
2475 case IEEE80211_STA_MLME_IBSS_JOINED:
2476 ieee80211_sta_merge_ibss(sdata, ifsta);
2477 break;
2478 default:
2479 WARN_ON(1);
2480 break;
2481 }
2482
2483 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2484 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2485 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2486
2487 ieee80211_set_disassoc(sdata, ifsta, false, true,
2488 WLAN_REASON_UNSPECIFIED);
2489 }
2490 }
2491
2492 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2493 {
2494 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2495 queue_work(sdata->local->hw.workqueue,
2496 &sdata->u.sta.work);
2497 }
2498
2499 /* interface setup */
2500 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2501 {
2502 struct ieee80211_if_sta *ifsta;
2503
2504 ifsta = &sdata->u.sta;
2505 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2506 INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2507 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2508 (unsigned long) sdata);
2509 setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2510 (unsigned long) sdata);
2511 skb_queue_head_init(&ifsta->skb_queue);
2512
2513 ifsta->capab = WLAN_CAPABILITY_ESS;
2514 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2515 IEEE80211_AUTH_ALG_SHARED_KEY;
2516 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2517 IEEE80211_STA_AUTO_BSSID_SEL |
2518 IEEE80211_STA_AUTO_CHANNEL_SEL;
2519 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2520 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2521 }
2522
2523 /*
2524 * Add a new IBSS station, will also be called by the RX code when,
2525 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2526 * must be callable in atomic context.
2527 */
2528 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2529 u8 *bssid,u8 *addr, u64 supp_rates)
2530 {
2531 struct ieee80211_local *local = sdata->local;
2532 struct sta_info *sta;
2533 int band = local->hw.conf.channel->band;
2534
2535 /* TODO: Could consider removing the least recently used entry and
2536 * allow new one to be added. */
2537 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2538 if (net_ratelimit()) {
2539 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2540 "entry %pM\n", sdata->dev->name, addr);
2541 }
2542 return NULL;
2543 }
2544
2545 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2546 return NULL;
2547
2548 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2549 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2550 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2551 #endif
2552
2553 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2554 if (!sta)
2555 return NULL;
2556
2557 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2558
2559 /* make sure mandatory rates are always added */
2560 sta->sta.supp_rates[band] = supp_rates |
2561 ieee80211_mandatory_rates(local, band);
2562
2563 rate_control_rate_init(sta);
2564
2565 if (sta_info_insert(sta))
2566 return NULL;
2567
2568 return sta;
2569 }
2570
2571 /* configuration hooks */
2572 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2573 struct ieee80211_if_sta *ifsta)
2574 {
2575 struct ieee80211_local *local = sdata->local;
2576
2577 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2578 return;
2579
2580 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2581 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2582 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2583 IEEE80211_STA_AUTO_SSID_SEL))) {
2584
2585 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2586 ieee80211_set_disassoc(sdata, ifsta, true, true,
2587 WLAN_REASON_DEAUTH_LEAVING);
2588
2589 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2590 queue_work(local->hw.workqueue, &ifsta->work);
2591 }
2592 }
2593
2594 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2595 {
2596 struct ieee80211_if_sta *ifsta;
2597
2598 if (len > IEEE80211_MAX_SSID_LEN)
2599 return -EINVAL;
2600
2601 ifsta = &sdata->u.sta;
2602
2603 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2604 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2605 memcpy(ifsta->ssid, ssid, len);
2606 ifsta->ssid_len = len;
2607 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2608 }
2609
2610 if (len)
2611 ifsta->flags |= IEEE80211_STA_SSID_SET;
2612 else
2613 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2614
2615 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2616 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2617 ifsta->ibss_join_req = jiffies;
2618 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2619 return ieee80211_sta_find_ibss(sdata, ifsta);
2620 }
2621
2622 return 0;
2623 }
2624
2625 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2626 {
2627 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2628 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2629 *len = ifsta->ssid_len;
2630 return 0;
2631 }
2632
2633 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2634 {
2635 struct ieee80211_if_sta *ifsta;
2636 int res;
2637 bool valid;
2638
2639 ifsta = &sdata->u.sta;
2640 valid = is_valid_ether_addr(bssid);
2641
2642 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2643 if(valid)
2644 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2645 else
2646 memset(ifsta->bssid, 0, ETH_ALEN);
2647 res = 0;
2648 /*
2649 * Hack! See also ieee80211_sta_set_ssid.
2650 */
2651 if (netif_running(sdata->dev))
2652 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2653 if (res) {
2654 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2655 "the low-level driver\n", sdata->dev->name);
2656 return res;
2657 }
2658 }
2659
2660 if (valid)
2661 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2662 else
2663 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2664
2665 return 0;
2666 }
2667
2668 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2669 {
2670 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2671
2672 kfree(ifsta->extra_ie);
2673 if (len == 0) {
2674 ifsta->extra_ie = NULL;
2675 ifsta->extra_ie_len = 0;
2676 return 0;
2677 }
2678 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2679 if (!ifsta->extra_ie) {
2680 ifsta->extra_ie_len = 0;
2681 return -ENOMEM;
2682 }
2683 memcpy(ifsta->extra_ie, ie, len);
2684 ifsta->extra_ie_len = len;
2685 return 0;
2686 }
2687
2688 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2689 {
2690 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2691
2692 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2693 sdata->dev->name, reason);
2694
2695 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2696 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2697 return -EINVAL;
2698
2699 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2700 return 0;
2701 }
2702
2703 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2704 {
2705 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2706
2707 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2708 sdata->dev->name, reason);
2709
2710 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2711 return -EINVAL;
2712
2713 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2714 return -1;
2715
2716 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2717 return 0;
2718 }
2719
2720 /* scan finished notification */
2721 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2722 {
2723 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2724 struct ieee80211_if_sta *ifsta;
2725
2726 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2727 ifsta = &sdata->u.sta;
2728 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2729 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2730 !ieee80211_sta_active_ibss(sdata)))
2731 ieee80211_sta_find_ibss(sdata, ifsta);
2732 }
2733
2734 /* Restart STA timers */
2735 rcu_read_lock();
2736 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2737 ieee80211_restart_sta_timer(sdata);
2738 rcu_read_unlock();
2739 }
2740
2741 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2742 {
2743 struct ieee80211_local *local =
2744 container_of(work, struct ieee80211_local,
2745 dynamic_ps_disable_work);
2746
2747 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2748 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2749 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2750 }
2751
2752 ieee80211_wake_queues_by_reason(&local->hw,
2753 IEEE80211_QUEUE_STOP_REASON_PS);
2754 }
2755
2756 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2757 {
2758 struct ieee80211_local *local =
2759 container_of(work, struct ieee80211_local,
2760 dynamic_ps_enable_work);
2761 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2762
2763 if (local->hw.conf.flags & IEEE80211_CONF_PS)
2764 return;
2765
2766 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2767 ieee80211_send_nullfunc(local, sdata, 1);
2768
2769 local->hw.conf.flags |= IEEE80211_CONF_PS;
2770 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2771 }
2772
2773 void ieee80211_dynamic_ps_timer(unsigned long data)
2774 {
2775 struct ieee80211_local *local = (void *) data;
2776
2777 queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2778 }
Linus' kernel tree