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nl80211: New command for adding extra IE(s) into management frames
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / mlme.c
blob43da6227b37c6392f830285fe218208bf53a659e
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.assoc_comeback && elems.assoc_comeback_len == 4) {
1321 u32 tu, ms;
1322 tu = get_unaligned_le32(elems.assoc_comeback);
1323 ms = tu * 1024 / 1000;
1324 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1325 "comeback duration %u TU (%u ms)\n",
1326 sdata->dev->name, tu, ms);
1327 if (ms > IEEE80211_ASSOC_TIMEOUT)
1328 mod_timer(&ifsta->timer,
1329 jiffies + msecs_to_jiffies(ms));
1330 return;
1331 }
1332
1333 if (status_code != WLAN_STATUS_SUCCESS) {
1334 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1335 sdata->dev->name, status_code);
1336 /* if this was a reassociation, ensure we try a "full"
1337 * association next time. This works around some broken APs
1338 * which do not correctly reject reassociation requests. */
1339 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1340 return;
1341 }
1342
1343 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1344 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1345 "set\n", sdata->dev->name, aid);
1346 aid &= ~(BIT(15) | BIT(14));
1347
1348 if (!elems.supp_rates) {
1349 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1350 sdata->dev->name);
1351 return;
1352 }
1353
1354 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1355 ifsta->aid = aid;
1356 ifsta->ap_capab = capab_info;
1357
1358 kfree(ifsta->assocresp_ies);
1359 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1360 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1361 if (ifsta->assocresp_ies)
1362 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1363
1364 rcu_read_lock();
1365
1366 /* Add STA entry for the AP */
1367 sta = sta_info_get(local, ifsta->bssid);
1368 if (!sta) {
1369 struct ieee80211_bss *bss;
1370
1371 newsta = true;
1372
1373 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1374 if (!sta) {
1375 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1376 " the AP\n", sdata->dev->name);
1377 rcu_read_unlock();
1378 return;
1379 }
1380 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1381 local->hw.conf.channel->center_freq,
1382 ifsta->ssid, ifsta->ssid_len);
1383 if (bss) {
1384 sta->last_signal = bss->signal;
1385 sta->last_qual = bss->qual;
1386 sta->last_noise = bss->noise;
1387 ieee80211_rx_bss_put(local, bss);
1388 }
1389
1390 /* update new sta with its last rx activity */
1391 sta->last_rx = jiffies;
1392 }
1393
1394 /*
1395 * FIXME: Do we really need to update the sta_info's information here?
1396 * We already know about the AP (we found it in our list) so it
1397 * should already be filled with the right info, no?
1398 * As is stands, all this is racy because typically we assume
1399 * the information that is filled in here (except flags) doesn't
1400 * change while a STA structure is alive. As such, it should move
1401 * to between the sta_info_alloc() and sta_info_insert() above.
1402 */
1403
1404 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1405 WLAN_STA_AUTHORIZED);
1406
1407 rates = 0;
1408 basic_rates = 0;
1409 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1410
1411 for (i = 0; i < elems.supp_rates_len; i++) {
1412 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1413 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1414
1415 if (rate > 110)
1416 have_higher_than_11mbit = true;
1417
1418 for (j = 0; j < sband->n_bitrates; j++) {
1419 if (sband->bitrates[j].bitrate == rate) {
1420 rates |= BIT(j);
1421 if (is_basic)
1422 basic_rates |= BIT(j);
1423 break;
1424 }
1425 }
1426 }
1427
1428 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1429 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1430 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1431
1432 if (rate > 110)
1433 have_higher_than_11mbit = true;
1434
1435 for (j = 0; j < sband->n_bitrates; j++) {
1436 if (sband->bitrates[j].bitrate == rate) {
1437 rates |= BIT(j);
1438 if (is_basic)
1439 basic_rates |= BIT(j);
1440 break;
1441 }
1442 }
1443 }
1444
1445 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1446 sdata->vif.bss_conf.basic_rates = basic_rates;
1447
1448 /* cf. IEEE 802.11 9.2.12 */
1449 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1450 have_higher_than_11mbit)
1451 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1452 else
1453 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1454
1455 if (elems.ht_cap_elem)
1456 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1457 elems.ht_cap_elem, &sta->sta.ht_cap);
1458
1459 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1460
1461 rate_control_rate_init(sta);
1462
1463 if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
1464 set_sta_flags(sta, WLAN_STA_MFP);
1465
1466 if (elems.wmm_param)
1467 set_sta_flags(sta, WLAN_STA_WME);
1468
1469 if (newsta) {
1470 int err = sta_info_insert(sta);
1471 if (err) {
1472 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1473 " the AP (error %d)\n", sdata->dev->name, err);
1474 rcu_read_unlock();
1475 return;
1476 }
1477 }
1478
1479 rcu_read_unlock();
1480
1481 if (elems.wmm_param)
1482 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1483 elems.wmm_param_len);
1484
1485 if (elems.ht_info_elem && elems.wmm_param &&
1486 (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1487 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1488 ap_ht_cap_flags);
1489
1490 /* set AID and assoc capability,
1491 * ieee80211_set_associated() will tell the driver */
1492 bss_conf->aid = aid;
1493 bss_conf->assoc_capability = capab_info;
1494 ieee80211_set_associated(sdata, ifsta, changed);
1495
1496 ieee80211_associated(sdata, ifsta);
1497 }
1498
1499
1500 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1501 struct ieee80211_if_sta *ifsta,
1502 struct ieee80211_bss *bss)
1503 {
1504 struct ieee80211_local *local = sdata->local;
1505 int res, rates, i, j;
1506 struct sk_buff *skb;
1507 struct ieee80211_mgmt *mgmt;
1508 u8 *pos;
1509 struct ieee80211_supported_band *sband;
1510 union iwreq_data wrqu;
1511
1512 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
1513 sdata->u.sta.ie_proberesp_len);
1514 if (!skb) {
1515 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1516 "response\n", sdata->dev->name);
1517 return -ENOMEM;
1518 }
1519
1520 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1521
1522 /* Remove possible STA entries from other IBSS networks. */
1523 sta_info_flush_delayed(sdata);
1524
1525 if (local->ops->reset_tsf) {
1526 /* Reset own TSF to allow time synchronization work. */
1527 local->ops->reset_tsf(local_to_hw(local));
1528 }
1529 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1530 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1531 if (res)
1532 return res;
1533
1534 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1535
1536 sdata->drop_unencrypted = bss->capability &
1537 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1538
1539 res = ieee80211_set_freq(sdata, bss->freq);
1540
1541 if (res)
1542 return res;
1543
1544 /* Build IBSS probe response */
1545
1546 skb_reserve(skb, local->hw.extra_tx_headroom);
1547
1548 mgmt = (struct ieee80211_mgmt *)
1549 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1550 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1551 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1552 IEEE80211_STYPE_PROBE_RESP);
1553 memset(mgmt->da, 0xff, ETH_ALEN);
1554 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1555 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1556 mgmt->u.beacon.beacon_int =
1557 cpu_to_le16(local->hw.conf.beacon_int);
1558 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1559 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1560
1561 pos = skb_put(skb, 2 + ifsta->ssid_len);
1562 *pos++ = WLAN_EID_SSID;
1563 *pos++ = ifsta->ssid_len;
1564 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1565
1566 rates = bss->supp_rates_len;
1567 if (rates > 8)
1568 rates = 8;
1569 pos = skb_put(skb, 2 + rates);
1570 *pos++ = WLAN_EID_SUPP_RATES;
1571 *pos++ = rates;
1572 memcpy(pos, bss->supp_rates, rates);
1573
1574 if (bss->band == IEEE80211_BAND_2GHZ) {
1575 pos = skb_put(skb, 2 + 1);
1576 *pos++ = WLAN_EID_DS_PARAMS;
1577 *pos++ = 1;
1578 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1579 }
1580
1581 pos = skb_put(skb, 2 + 2);
1582 *pos++ = WLAN_EID_IBSS_PARAMS;
1583 *pos++ = 2;
1584 /* FIX: set ATIM window based on scan results */
1585 *pos++ = 0;
1586 *pos++ = 0;
1587
1588 if (bss->supp_rates_len > 8) {
1589 rates = bss->supp_rates_len - 8;
1590 pos = skb_put(skb, 2 + rates);
1591 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1592 *pos++ = rates;
1593 memcpy(pos, &bss->supp_rates[8], rates);
1594 }
1595
1596 add_extra_ies(skb, sdata->u.sta.ie_proberesp,
1597 sdata->u.sta.ie_proberesp_len);
1598
1599 ifsta->probe_resp = skb;
1600
1601 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1602
1603
1604 rates = 0;
1605 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1606 for (i = 0; i < bss->supp_rates_len; i++) {
1607 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1608 for (j = 0; j < sband->n_bitrates; j++)
1609 if (sband->bitrates[j].bitrate == bitrate)
1610 rates |= BIT(j);
1611 }
1612 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1613
1614 ieee80211_sta_def_wmm_params(sdata, bss);
1615
1616 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1617 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1618
1619 ieee80211_led_assoc(local, true);
1620
1621 memset(&wrqu, 0, sizeof(wrqu));
1622 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1623 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1624
1625 return res;
1626 }
1627
1628 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1629 struct ieee80211_mgmt *mgmt,
1630 size_t len,
1631 struct ieee80211_rx_status *rx_status,
1632 struct ieee802_11_elems *elems,
1633 bool beacon)
1634 {
1635 struct ieee80211_local *local = sdata->local;
1636 int freq;
1637 struct ieee80211_bss *bss;
1638 struct sta_info *sta;
1639 struct ieee80211_channel *channel;
1640 u64 beacon_timestamp, rx_timestamp;
1641 u64 supp_rates = 0;
1642 enum ieee80211_band band = rx_status->band;
1643
1644 if (elems->ds_params && elems->ds_params_len == 1)
1645 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1646 else
1647 freq = rx_status->freq;
1648
1649 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1650
1651 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1652 return;
1653
1654 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1655 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1656 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1657
1658 rcu_read_lock();
1659
1660 sta = sta_info_get(local, mgmt->sa);
1661 if (sta) {
1662 u64 prev_rates;
1663
1664 prev_rates = sta->sta.supp_rates[band];
1665 /* make sure mandatory rates are always added */
1666 sta->sta.supp_rates[band] = supp_rates |
1667 ieee80211_mandatory_rates(local, band);
1668
1669 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1670 if (sta->sta.supp_rates[band] != prev_rates)
1671 printk(KERN_DEBUG "%s: updated supp_rates set "
1672 "for %pM based on beacon info (0x%llx | "
1673 "0x%llx -> 0x%llx)\n",
1674 sdata->dev->name,
1675 sta->sta.addr,
1676 (unsigned long long) prev_rates,
1677 (unsigned long long) supp_rates,
1678 (unsigned long long) sta->sta.supp_rates[band]);
1679 #endif
1680 } else {
1681 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1682 }
1683
1684 rcu_read_unlock();
1685 }
1686
1687 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1688 freq, beacon);
1689 if (!bss)
1690 return;
1691
1692 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1693 (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1694 struct ieee80211_channel_sw_ie *sw_elem =
1695 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1696 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1697 }
1698
1699 /* was just updated in ieee80211_bss_info_update */
1700 beacon_timestamp = bss->timestamp;
1701
1702 /*
1703 * In STA mode, the remaining parameters should not be overridden
1704 * by beacons because they're not necessarily accurate there.
1705 */
1706 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1707 bss->last_probe_resp && beacon) {
1708 ieee80211_rx_bss_put(local, bss);
1709 return;
1710 }
1711
1712 /* check if we need to merge IBSS */
1713 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1714 (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1715 bss->capability & WLAN_CAPABILITY_IBSS &&
1716 bss->freq == local->oper_channel->center_freq &&
1717 elems->ssid_len == sdata->u.sta.ssid_len &&
1718 memcmp(elems->ssid, sdata->u.sta.ssid,
1719 sdata->u.sta.ssid_len) == 0) {
1720 if (rx_status->flag & RX_FLAG_TSFT) {
1721 /* in order for correct IBSS merging we need mactime
1722 *
1723 * since mactime is defined as the time the first data
1724 * symbol of the frame hits the PHY, and the timestamp
1725 * of the beacon is defined as "the time that the data
1726 * symbol containing the first bit of the timestamp is
1727 * transmitted to the PHY plus the transmitting STA’s
1728 * delays through its local PHY from the MAC-PHY
1729 * interface to its interface with the WM"
1730 * (802.11 11.1.2) - equals the time this bit arrives at
1731 * the receiver - we have to take into account the
1732 * offset between the two.
1733 * e.g: at 1 MBit that means mactime is 192 usec earlier
1734 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1735 */
1736 int rate;
1737 if (rx_status->flag & RX_FLAG_HT) {
1738 rate = 65; /* TODO: HT rates */
1739 } else {
1740 rate = local->hw.wiphy->bands[band]->
1741 bitrates[rx_status->rate_idx].bitrate;
1742 }
1743 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1744 } else if (local && local->ops && local->ops->get_tsf)
1745 /* second best option: get current TSF */
1746 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1747 else
1748 /* can't merge without knowing the TSF */
1749 rx_timestamp = -1LLU;
1750 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1751 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1752 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1753 mgmt->sa, mgmt->bssid,
1754 (unsigned long long)rx_timestamp,
1755 (unsigned long long)beacon_timestamp,
1756 (unsigned long long)(rx_timestamp - beacon_timestamp),
1757 jiffies);
1758 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1759 if (beacon_timestamp > rx_timestamp) {
1760 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1761 printk(KERN_DEBUG "%s: beacon TSF higher than "
1762 "local TSF - IBSS merge with BSSID %pM\n",
1763 sdata->dev->name, mgmt->bssid);
1764 #endif
1765 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1766 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1767 }
1768 }
1769
1770 ieee80211_rx_bss_put(local, bss);
1771 }
1772
1773
1774 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1775 struct ieee80211_mgmt *mgmt,
1776 size_t len,
1777 struct ieee80211_rx_status *rx_status)
1778 {
1779 size_t baselen;
1780 struct ieee802_11_elems elems;
1781 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1782
1783 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1784 return; /* ignore ProbeResp to foreign address */
1785
1786 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1787 if (baselen > len)
1788 return;
1789
1790 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1791 &elems);
1792
1793 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1794
1795 /* direct probe may be part of the association flow */
1796 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1797 &ifsta->request)) {
1798 printk(KERN_DEBUG "%s direct probe responded\n",
1799 sdata->dev->name);
1800 ieee80211_authenticate(sdata, ifsta);
1801 }
1802 }
1803
1804
1805 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1806 struct ieee80211_mgmt *mgmt,
1807 size_t len,
1808 struct ieee80211_rx_status *rx_status)
1809 {
1810 struct ieee80211_if_sta *ifsta;
1811 size_t baselen;
1812 struct ieee802_11_elems elems;
1813 struct ieee80211_local *local = sdata->local;
1814 u32 changed = 0;
1815 bool erp_valid, directed_tim, is_mc = false;
1816 u8 erp_value = 0;
1817
1818 /* Process beacon from the current BSS */
1819 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1820 if (baselen > len)
1821 return;
1822
1823 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1824
1825 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1826
1827 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1828 return;
1829 ifsta = &sdata->u.sta;
1830
1831 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1832 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1833 return;
1834
1835 if (rx_status->freq != local->hw.conf.channel->center_freq)
1836 return;
1837
1838 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1839 elems.wmm_param_len);
1840
1841 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1842 local->hw.conf.flags & IEEE80211_CONF_PS) {
1843 directed_tim = check_tim(&elems, ifsta->aid, &is_mc);
1844
1845 if (directed_tim || is_mc) {
1846 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1847 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1848 ieee80211_send_nullfunc(local, sdata, 0);
1849 }
1850 }
1851
1852 if (elems.erp_info && elems.erp_info_len >= 1) {
1853 erp_valid = true;
1854 erp_value = elems.erp_info[0];
1855 } else {
1856 erp_valid = false;
1857 }
1858 changed |= ieee80211_handle_bss_capability(sdata,
1859 le16_to_cpu(mgmt->u.beacon.capab_info),
1860 erp_valid, erp_value);
1861
1862
1863 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1864 struct sta_info *sta;
1865 struct ieee80211_supported_band *sband;
1866 u16 ap_ht_cap_flags;
1867
1868 rcu_read_lock();
1869
1870 sta = sta_info_get(local, ifsta->bssid);
1871 if (!sta) {
1872 rcu_read_unlock();
1873 return;
1874 }
1875
1876 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1877
1878 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1879 elems.ht_cap_elem, &sta->sta.ht_cap);
1880
1881 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1882
1883 rcu_read_unlock();
1884
1885 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1886 ap_ht_cap_flags);
1887 }
1888
1889 if (elems.country_elem) {
1890 /* Note we are only reviewing this on beacons
1891 * for the BSSID we are associated to */
1892 regulatory_hint_11d(local->hw.wiphy,
1893 elems.country_elem, elems.country_elem_len);
1894
1895 /* TODO: IBSS also needs this */
1896 if (elems.pwr_constr_elem)
1897 ieee80211_handle_pwr_constr(sdata,
1898 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1899 elems.pwr_constr_elem,
1900 elems.pwr_constr_elem_len);
1901 }
1902
1903 ieee80211_bss_info_change_notify(sdata, changed);
1904 }
1905
1906
1907 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1908 struct ieee80211_if_sta *ifsta,
1909 struct ieee80211_mgmt *mgmt,
1910 size_t len)
1911 {
1912 struct ieee80211_local *local = sdata->local;
1913 int tx_last_beacon;
1914 struct sk_buff *skb;
1915 struct ieee80211_mgmt *resp;
1916 u8 *pos, *end;
1917
1918 if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1919 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1920 len < 24 + 2 || !ifsta->probe_resp)
1921 return;
1922
1923 if (local->ops->tx_last_beacon)
1924 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1925 else
1926 tx_last_beacon = 1;
1927
1928 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1929 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1930 " (tx_last_beacon=%d)\n",
1931 sdata->dev->name, mgmt->sa, mgmt->da,
1932 mgmt->bssid, tx_last_beacon);
1933 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1934
1935 if (!tx_last_beacon)
1936 return;
1937
1938 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1939 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1940 return;
1941
1942 end = ((u8 *) mgmt) + len;
1943 pos = mgmt->u.probe_req.variable;
1944 if (pos[0] != WLAN_EID_SSID ||
1945 pos + 2 + pos[1] > end) {
1946 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1947 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1948 "from %pM\n",
1949 sdata->dev->name, mgmt->sa);
1950 #endif
1951 return;
1952 }
1953 if (pos[1] != 0 &&
1954 (pos[1] != ifsta->ssid_len ||
1955 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1956 /* Ignore ProbeReq for foreign SSID */
1957 return;
1958 }
1959
1960 /* Reply with ProbeResp */
1961 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1962 if (!skb)
1963 return;
1964
1965 resp = (struct ieee80211_mgmt *) skb->data;
1966 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1967 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1968 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1969 sdata->dev->name, resp->da);
1970 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1971 ieee80211_tx_skb(sdata, skb, 0);
1972 }
1973
1974 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1975 struct ieee80211_rx_status *rx_status)
1976 {
1977 struct ieee80211_local *local = sdata->local;
1978 struct ieee80211_if_sta *ifsta;
1979 struct ieee80211_mgmt *mgmt;
1980 u16 fc;
1981
1982 if (skb->len < 24)
1983 goto fail;
1984
1985 ifsta = &sdata->u.sta;
1986
1987 mgmt = (struct ieee80211_mgmt *) skb->data;
1988 fc = le16_to_cpu(mgmt->frame_control);
1989
1990 switch (fc & IEEE80211_FCTL_STYPE) {
1991 case IEEE80211_STYPE_PROBE_REQ:
1992 case IEEE80211_STYPE_PROBE_RESP:
1993 case IEEE80211_STYPE_BEACON:
1994 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1995 case IEEE80211_STYPE_AUTH:
1996 case IEEE80211_STYPE_ASSOC_RESP:
1997 case IEEE80211_STYPE_REASSOC_RESP:
1998 case IEEE80211_STYPE_DEAUTH:
1999 case IEEE80211_STYPE_DISASSOC:
2000 skb_queue_tail(&ifsta->skb_queue, skb);
2001 queue_work(local->hw.workqueue, &ifsta->work);
2002 return;
2003 }
2004
2005 fail:
2006 kfree_skb(skb);
2007 }
2008
2009 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2010 struct sk_buff *skb)
2011 {
2012 struct ieee80211_rx_status *rx_status;
2013 struct ieee80211_if_sta *ifsta;
2014 struct ieee80211_mgmt *mgmt;
2015 u16 fc;
2016
2017 ifsta = &sdata->u.sta;
2018
2019 rx_status = (struct ieee80211_rx_status *) skb->cb;
2020 mgmt = (struct ieee80211_mgmt *) skb->data;
2021 fc = le16_to_cpu(mgmt->frame_control);
2022
2023 switch (fc & IEEE80211_FCTL_STYPE) {
2024 case IEEE80211_STYPE_PROBE_REQ:
2025 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
2026 break;
2027 case IEEE80211_STYPE_PROBE_RESP:
2028 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
2029 break;
2030 case IEEE80211_STYPE_BEACON:
2031 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2032 break;
2033 case IEEE80211_STYPE_AUTH:
2034 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2035 break;
2036 case IEEE80211_STYPE_ASSOC_RESP:
2037 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2038 break;
2039 case IEEE80211_STYPE_REASSOC_RESP:
2040 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2041 break;
2042 case IEEE80211_STYPE_DEAUTH:
2043 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2044 break;
2045 case IEEE80211_STYPE_DISASSOC:
2046 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2047 break;
2048 }
2049
2050 kfree_skb(skb);
2051 }
2052
2053
2054 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
2055 {
2056 struct ieee80211_local *local = sdata->local;
2057 int active = 0;
2058 struct sta_info *sta;
2059
2060 rcu_read_lock();
2061
2062 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2063 if (sta->sdata == sdata &&
2064 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2065 jiffies)) {
2066 active++;
2067 break;
2068 }
2069 }
2070
2071 rcu_read_unlock();
2072
2073 return active;
2074 }
2075
2076
2077 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2078 struct ieee80211_if_sta *ifsta)
2079 {
2080 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2081
2082 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2083 if (ieee80211_sta_active_ibss(sdata))
2084 return;
2085
2086 if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2087 (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2088 return;
2089
2090 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2091 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2092 ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
2093 }
2094
2095
2096 static void ieee80211_sta_timer(unsigned long data)
2097 {
2098 struct ieee80211_sub_if_data *sdata =
2099 (struct ieee80211_sub_if_data *) data;
2100 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2101 struct ieee80211_local *local = sdata->local;
2102
2103 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2104 queue_work(local->hw.workqueue, &ifsta->work);
2105 }
2106
2107 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2108 struct ieee80211_if_sta *ifsta)
2109 {
2110 struct ieee80211_local *local = sdata->local;
2111
2112 if (local->ops->reset_tsf) {
2113 /* Reset own TSF to allow time synchronization work. */
2114 local->ops->reset_tsf(local_to_hw(local));
2115 }
2116
2117 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2118
2119
2120 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2121 ifsta->auth_alg = WLAN_AUTH_OPEN;
2122 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2123 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2124 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2125 ifsta->auth_alg = WLAN_AUTH_LEAP;
2126 else
2127 ifsta->auth_alg = WLAN_AUTH_OPEN;
2128 ifsta->auth_transaction = -1;
2129 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2130 ifsta->assoc_scan_tries = 0;
2131 ifsta->direct_probe_tries = 0;
2132 ifsta->auth_tries = 0;
2133 ifsta->assoc_tries = 0;
2134 netif_tx_stop_all_queues(sdata->dev);
2135 netif_carrier_off(sdata->dev);
2136 }
2137
2138
2139 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2140 const char *ssid, int ssid_len)
2141 {
2142 int tmp, hidden_ssid;
2143
2144 if (ssid_len == ifsta->ssid_len &&
2145 !memcmp(ifsta->ssid, ssid, ssid_len))
2146 return 1;
2147
2148 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2149 return 0;
2150
2151 hidden_ssid = 1;
2152 tmp = ssid_len;
2153 while (tmp--) {
2154 if (ssid[tmp] != '\0') {
2155 hidden_ssid = 0;
2156 break;
2157 }
2158 }
2159
2160 if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2161 return 1;
2162
2163 if (ssid_len == 1 && ssid[0] == ' ')
2164 return 1;
2165
2166 return 0;
2167 }
2168
2169 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2170 struct ieee80211_if_sta *ifsta)
2171 {
2172 struct ieee80211_local *local = sdata->local;
2173 struct ieee80211_bss *bss;
2174 struct ieee80211_supported_band *sband;
2175 u8 bssid[ETH_ALEN], *pos;
2176 int i;
2177 int ret;
2178
2179 #if 0
2180 /* Easier testing, use fixed BSSID. */
2181 memset(bssid, 0xfe, ETH_ALEN);
2182 #else
2183 /* Generate random, not broadcast, locally administered BSSID. Mix in
2184 * own MAC address to make sure that devices that do not have proper
2185 * random number generator get different BSSID. */
2186 get_random_bytes(bssid, ETH_ALEN);
2187 for (i = 0; i < ETH_ALEN; i++)
2188 bssid[i] ^= sdata->dev->dev_addr[i];
2189 bssid[0] &= ~0x01;
2190 bssid[0] |= 0x02;
2191 #endif
2192
2193 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2194 sdata->dev->name, bssid);
2195
2196 bss = ieee80211_rx_bss_add(local, bssid,
2197 local->hw.conf.channel->center_freq,
2198 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2199 if (!bss)
2200 return -ENOMEM;
2201
2202 bss->band = local->hw.conf.channel->band;
2203 sband = local->hw.wiphy->bands[bss->band];
2204
2205 if (local->hw.conf.beacon_int == 0)
2206 local->hw.conf.beacon_int = 100;
2207 bss->beacon_int = local->hw.conf.beacon_int;
2208 bss->last_update = jiffies;
2209 bss->capability = WLAN_CAPABILITY_IBSS;
2210
2211 if (sdata->default_key)
2212 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2213 else
2214 sdata->drop_unencrypted = 0;
2215
2216 bss->supp_rates_len = sband->n_bitrates;
2217 pos = bss->supp_rates;
2218 for (i = 0; i < sband->n_bitrates; i++) {
2219 int rate = sband->bitrates[i].bitrate;
2220 *pos++ = (u8) (rate / 5);
2221 }
2222
2223 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2224 ieee80211_rx_bss_put(local, bss);
2225 return ret;
2226 }
2227
2228
2229 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2230 struct ieee80211_if_sta *ifsta)
2231 {
2232 struct ieee80211_local *local = sdata->local;
2233 struct ieee80211_bss *bss;
2234 int found = 0;
2235 u8 bssid[ETH_ALEN];
2236 int active_ibss;
2237
2238 if (ifsta->ssid_len == 0)
2239 return -EINVAL;
2240
2241 active_ibss = ieee80211_sta_active_ibss(sdata);
2242 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2243 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2244 sdata->dev->name, active_ibss);
2245 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2246 spin_lock_bh(&local->bss_lock);
2247 list_for_each_entry(bss, &local->bss_list, list) {
2248 if (ifsta->ssid_len != bss->ssid_len ||
2249 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2250 || !(bss->capability & WLAN_CAPABILITY_IBSS))
2251 continue;
2252 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2253 printk(KERN_DEBUG " bssid=%pM found\n", bss->bssid);
2254 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2255 memcpy(bssid, bss->bssid, ETH_ALEN);
2256 found = 1;
2257 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2258 break;
2259 }
2260 spin_unlock_bh(&local->bss_lock);
2261
2262 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2263 if (found)
2264 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
2265 "%pM\n", bssid, ifsta->bssid);
2266 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2267
2268 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2269 int ret;
2270 int search_freq;
2271
2272 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2273 search_freq = bss->freq;
2274 else
2275 search_freq = local->hw.conf.channel->center_freq;
2276
2277 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2278 ifsta->ssid, ifsta->ssid_len);
2279 if (!bss)
2280 goto dont_join;
2281
2282 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2283 " based on configured SSID\n",
2284 sdata->dev->name, bssid);
2285 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2286 ieee80211_rx_bss_put(local, bss);
2287 return ret;
2288 }
2289
2290 dont_join:
2291 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2292 printk(KERN_DEBUG " did not try to join ibss\n");
2293 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2294
2295 /* Selected IBSS not found in current scan results - try to scan */
2296 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2297 !ieee80211_sta_active_ibss(sdata)) {
2298 mod_timer(&ifsta->timer, jiffies +
2299 IEEE80211_IBSS_MERGE_INTERVAL);
2300 } else if (time_after(jiffies, local->last_scan_completed +
2301 IEEE80211_SCAN_INTERVAL)) {
2302 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2303 "join\n", sdata->dev->name);
2304 return ieee80211_request_scan(sdata, ifsta->ssid,
2305 ifsta->ssid_len);
2306 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2307 int interval = IEEE80211_SCAN_INTERVAL;
2308
2309 if (time_after(jiffies, ifsta->ibss_join_req +
2310 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2311 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2312 (!(local->oper_channel->flags &
2313 IEEE80211_CHAN_NO_IBSS)))
2314 return ieee80211_sta_create_ibss(sdata, ifsta);
2315 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2316 printk(KERN_DEBUG "%s: IBSS not allowed on"
2317 " %d MHz\n", sdata->dev->name,
2318 local->hw.conf.channel->center_freq);
2319 }
2320
2321 /* No IBSS found - decrease scan interval and continue
2322 * scanning. */
2323 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2324 }
2325
2326 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2327 mod_timer(&ifsta->timer, jiffies + interval);
2328 return 0;
2329 }
2330
2331 return 0;
2332 }
2333
2334
2335 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2336 struct ieee80211_if_sta *ifsta)
2337 {
2338 struct ieee80211_local *local = sdata->local;
2339 struct ieee80211_bss *bss, *selected = NULL;
2340 int top_rssi = 0, freq;
2341
2342 spin_lock_bh(&local->bss_lock);
2343 freq = local->oper_channel->center_freq;
2344 list_for_each_entry(bss, &local->bss_list, list) {
2345 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2346 continue;
2347
2348 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2349 IEEE80211_STA_AUTO_BSSID_SEL |
2350 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2351 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2352 !!sdata->default_key))
2353 continue;
2354
2355 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2356 bss->freq != freq)
2357 continue;
2358
2359 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2360 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2361 continue;
2362
2363 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2364 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2365 continue;
2366
2367 if (!selected || top_rssi < bss->signal) {
2368 selected = bss;
2369 top_rssi = bss->signal;
2370 }
2371 }
2372 if (selected)
2373 atomic_inc(&selected->users);
2374 spin_unlock_bh(&local->bss_lock);
2375
2376 if (selected) {
2377 ieee80211_set_freq(sdata, selected->freq);
2378 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2379 ieee80211_sta_set_ssid(sdata, selected->ssid,
2380 selected->ssid_len);
2381 ieee80211_sta_set_bssid(sdata, selected->bssid);
2382 ieee80211_sta_def_wmm_params(sdata, selected);
2383 if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
2384 sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
2385 else
2386 sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
2387
2388 /* Send out direct probe if no probe resp was received or
2389 * the one we have is outdated
2390 */
2391 if (!selected->last_probe_resp ||
2392 time_after(jiffies, selected->last_probe_resp
2393 + IEEE80211_SCAN_RESULT_EXPIRE))
2394 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2395 else
2396 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2397
2398 ieee80211_rx_bss_put(local, selected);
2399 ieee80211_sta_reset_auth(sdata, ifsta);
2400 return 0;
2401 } else {
2402 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2403 ifsta->assoc_scan_tries++;
2404 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2405 ieee80211_start_scan(sdata, NULL, 0);
2406 else
2407 ieee80211_start_scan(sdata, ifsta->ssid,
2408 ifsta->ssid_len);
2409 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2410 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2411 } else
2412 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2413 }
2414 return -1;
2415 }
2416
2417
2418 static void ieee80211_sta_work(struct work_struct *work)
2419 {
2420 struct ieee80211_sub_if_data *sdata =
2421 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2422 struct ieee80211_local *local = sdata->local;
2423 struct ieee80211_if_sta *ifsta;
2424 struct sk_buff *skb;
2425
2426 if (!netif_running(sdata->dev))
2427 return;
2428
2429 if (local->sw_scanning || local->hw_scanning)
2430 return;
2431
2432 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2433 sdata->vif.type != NL80211_IFTYPE_ADHOC))
2434 return;
2435 ifsta = &sdata->u.sta;
2436
2437 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2438 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2439
2440 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2441 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2442 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2443 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2444 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2445 ifsta->scan_ssid_len);
2446 return;
2447 }
2448
2449 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2450 if (ieee80211_sta_config_auth(sdata, ifsta))
2451 return;
2452 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2453 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2454 return;
2455
2456 switch (ifsta->state) {
2457 case IEEE80211_STA_MLME_DISABLED:
2458 break;
2459 case IEEE80211_STA_MLME_DIRECT_PROBE:
2460 ieee80211_direct_probe(sdata, ifsta);
2461 break;
2462 case IEEE80211_STA_MLME_AUTHENTICATE:
2463 ieee80211_authenticate(sdata, ifsta);
2464 break;
2465 case IEEE80211_STA_MLME_ASSOCIATE:
2466 ieee80211_associate(sdata, ifsta);
2467 break;
2468 case IEEE80211_STA_MLME_ASSOCIATED:
2469 ieee80211_associated(sdata, ifsta);
2470 break;
2471 case IEEE80211_STA_MLME_IBSS_SEARCH:
2472 ieee80211_sta_find_ibss(sdata, ifsta);
2473 break;
2474 case IEEE80211_STA_MLME_IBSS_JOINED:
2475 ieee80211_sta_merge_ibss(sdata, ifsta);
2476 break;
2477 default:
2478 WARN_ON(1);
2479 break;
2480 }
2481
2482 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2483 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2484 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2485
2486 ieee80211_set_disassoc(sdata, ifsta, false, true,
2487 WLAN_REASON_UNSPECIFIED);
2488 }
2489 }
2490
2491 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2492 {
2493 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2494 queue_work(sdata->local->hw.workqueue,
2495 &sdata->u.sta.work);
2496 }
2497
2498 /* interface setup */
2499 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2500 {
2501 struct ieee80211_if_sta *ifsta;
2502
2503 ifsta = &sdata->u.sta;
2504 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2505 INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2506 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2507 (unsigned long) sdata);
2508 setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2509 (unsigned long) sdata);
2510 skb_queue_head_init(&ifsta->skb_queue);
2511
2512 ifsta->capab = WLAN_CAPABILITY_ESS;
2513 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2514 IEEE80211_AUTH_ALG_SHARED_KEY;
2515 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2516 IEEE80211_STA_AUTO_BSSID_SEL |
2517 IEEE80211_STA_AUTO_CHANNEL_SEL;
2518 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2519 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2520 }
2521
2522 /*
2523 * Add a new IBSS station, will also be called by the RX code when,
2524 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2525 * must be callable in atomic context.
2526 */
2527 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2528 u8 *bssid,u8 *addr, u64 supp_rates)
2529 {
2530 struct ieee80211_local *local = sdata->local;
2531 struct sta_info *sta;
2532 int band = local->hw.conf.channel->band;
2533
2534 /* TODO: Could consider removing the least recently used entry and
2535 * allow new one to be added. */
2536 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2537 if (net_ratelimit()) {
2538 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2539 "entry %pM\n", sdata->dev->name, addr);
2540 }
2541 return NULL;
2542 }
2543
2544 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2545 return NULL;
2546
2547 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2548 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2549 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2550 #endif
2551
2552 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2553 if (!sta)
2554 return NULL;
2555
2556 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2557
2558 /* make sure mandatory rates are always added */
2559 sta->sta.supp_rates[band] = supp_rates |
2560 ieee80211_mandatory_rates(local, band);
2561
2562 rate_control_rate_init(sta);
2563
2564 if (sta_info_insert(sta))
2565 return NULL;
2566
2567 return sta;
2568 }
2569
2570 /* configuration hooks */
2571 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2572 struct ieee80211_if_sta *ifsta)
2573 {
2574 struct ieee80211_local *local = sdata->local;
2575
2576 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2577 return;
2578
2579 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2580 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2581 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2582 IEEE80211_STA_AUTO_SSID_SEL))) {
2583
2584 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2585 ieee80211_set_disassoc(sdata, ifsta, true, true,
2586 WLAN_REASON_DEAUTH_LEAVING);
2587
2588 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2589 queue_work(local->hw.workqueue, &ifsta->work);
2590 }
2591 }
2592
2593 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2594 {
2595 struct ieee80211_if_sta *ifsta;
2596
2597 if (len > IEEE80211_MAX_SSID_LEN)
2598 return -EINVAL;
2599
2600 ifsta = &sdata->u.sta;
2601
2602 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2603 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2604 memcpy(ifsta->ssid, ssid, len);
2605 ifsta->ssid_len = len;
2606 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2607 }
2608
2609 if (len)
2610 ifsta->flags |= IEEE80211_STA_SSID_SET;
2611 else
2612 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2613
2614 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2615 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2616 ifsta->ibss_join_req = jiffies;
2617 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2618 return ieee80211_sta_find_ibss(sdata, ifsta);
2619 }
2620
2621 return 0;
2622 }
2623
2624 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2625 {
2626 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2627 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2628 *len = ifsta->ssid_len;
2629 return 0;
2630 }
2631
2632 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2633 {
2634 struct ieee80211_if_sta *ifsta;
2635 int res;
2636 bool valid;
2637
2638 ifsta = &sdata->u.sta;
2639 valid = is_valid_ether_addr(bssid);
2640
2641 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2642 if(valid)
2643 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2644 else
2645 memset(ifsta->bssid, 0, ETH_ALEN);
2646 res = 0;
2647 /*
2648 * Hack! See also ieee80211_sta_set_ssid.
2649 */
2650 if (netif_running(sdata->dev))
2651 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2652 if (res) {
2653 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2654 "the low-level driver\n", sdata->dev->name);
2655 return res;
2656 }
2657 }
2658
2659 if (valid)
2660 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2661 else
2662 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2663
2664 return 0;
2665 }
2666
2667 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2668 {
2669 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2670
2671 kfree(ifsta->extra_ie);
2672 if (len == 0) {
2673 ifsta->extra_ie = NULL;
2674 ifsta->extra_ie_len = 0;
2675 return 0;
2676 }
2677 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2678 if (!ifsta->extra_ie) {
2679 ifsta->extra_ie_len = 0;
2680 return -ENOMEM;
2681 }
2682 memcpy(ifsta->extra_ie, ie, len);
2683 ifsta->extra_ie_len = len;
2684 return 0;
2685 }
2686
2687 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2688 {
2689 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2690
2691 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2692 sdata->dev->name, reason);
2693
2694 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2695 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2696 return -EINVAL;
2697
2698 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2699 return 0;
2700 }
2701
2702 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2703 {
2704 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2705
2706 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2707 sdata->dev->name, reason);
2708
2709 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2710 return -EINVAL;
2711
2712 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2713 return -1;
2714
2715 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2716 return 0;
2717 }
2718
2719 /* scan finished notification */
2720 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2721 {
2722 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2723 struct ieee80211_if_sta *ifsta;
2724
2725 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2726 ifsta = &sdata->u.sta;
2727 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2728 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2729 !ieee80211_sta_active_ibss(sdata)))
2730 ieee80211_sta_find_ibss(sdata, ifsta);
2731 }
2732
2733 /* Restart STA timers */
2734 rcu_read_lock();
2735 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2736 ieee80211_restart_sta_timer(sdata);
2737 rcu_read_unlock();
2738 }
2739
2740 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2741 {
2742 struct ieee80211_local *local =
2743 container_of(work, struct ieee80211_local,
2744 dynamic_ps_disable_work);
2745
2746 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2747 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2748 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2749 }
2750
2751 ieee80211_wake_queues_by_reason(&local->hw,
2752 IEEE80211_QUEUE_STOP_REASON_PS);
2753 }
2754
2755 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2756 {
2757 struct ieee80211_local *local =
2758 container_of(work, struct ieee80211_local,
2759 dynamic_ps_enable_work);
2760 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2761
2762 if (local->hw.conf.flags & IEEE80211_CONF_PS)
2763 return;
2764
2765 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2766 ieee80211_send_nullfunc(local, sdata, 1);
2767
2768 local->hw.conf.flags |= IEEE80211_CONF_PS;
2769 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2770 }
2771
2772 void ieee80211_dynamic_ps_timer(unsigned long data)
2773 {
2774 struct ieee80211_local *local = (void *) data;
2775
2776 queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2777 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree