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mac80211: fix IBSS auth
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/wireless.h>
19 #include <linux/random.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/iw_handler.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
32 #define IEEE80211_AUTH_MAX_TRIES 3
33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
34 #define IEEE80211_ASSOC_MAX_TRIES 3
35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
36 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
38 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
41
42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
44
45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
46
47
48 /* utils */
49 static int ecw2cw(int ecw)
50 {
51 return (1 << ecw) - 1;
52 }
53
54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
55 {
56 u8 *end, *pos;
57
58 pos = bss->cbss.information_elements;
59 if (pos == NULL)
60 return NULL;
61 end = pos + bss->cbss.len_information_elements;
62
63 while (pos + 1 < end) {
64 if (pos + 2 + pos[1] > end)
65 break;
66 if (pos[0] == ie)
67 return pos;
68 pos += 2 + pos[1];
69 }
70
71 return NULL;
72 }
73
74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
75 struct ieee80211_supported_band *sband,
76 u32 *rates)
77 {
78 int i, j, count;
79 *rates = 0;
80 count = 0;
81 for (i = 0; i < bss->supp_rates_len; i++) {
82 int rate = (bss->supp_rates[i] & 0x7F) * 5;
83
84 for (j = 0; j < sband->n_bitrates; j++)
85 if (sband->bitrates[j].bitrate == rate) {
86 *rates |= BIT(j);
87 count++;
88 break;
89 }
90 }
91
92 return count;
93 }
94
95 /* also used by mesh code */
96 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
97 struct ieee802_11_elems *elems,
98 enum ieee80211_band band)
99 {
100 struct ieee80211_supported_band *sband;
101 struct ieee80211_rate *bitrates;
102 size_t num_rates;
103 u32 supp_rates;
104 int i, j;
105 sband = local->hw.wiphy->bands[band];
106
107 if (!sband) {
108 WARN_ON(1);
109 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
110 }
111
112 bitrates = sband->bitrates;
113 num_rates = sband->n_bitrates;
114 supp_rates = 0;
115 for (i = 0; i < elems->supp_rates_len +
116 elems->ext_supp_rates_len; i++) {
117 u8 rate = 0;
118 int own_rate;
119 if (i < elems->supp_rates_len)
120 rate = elems->supp_rates[i];
121 else if (elems->ext_supp_rates)
122 rate = elems->ext_supp_rates
123 [i - elems->supp_rates_len];
124 own_rate = 5 * (rate & 0x7f);
125 for (j = 0; j < num_rates; j++)
126 if (bitrates[j].bitrate == own_rate)
127 supp_rates |= BIT(j);
128 }
129 return supp_rates;
130 }
131
132 /* frame sending functions */
133
134 static void add_extra_ies(struct sk_buff *skb, u8 *ies, size_t ies_len)
135 {
136 if (ies)
137 memcpy(skb_put(skb, ies_len), ies, ies_len);
138 }
139
140 /* also used by scanning code */
141 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
142 u8 *ssid, size_t ssid_len)
143 {
144 struct ieee80211_local *local = sdata->local;
145 struct ieee80211_supported_band *sband;
146 struct sk_buff *skb;
147 struct ieee80211_mgmt *mgmt;
148 u8 *pos, *supp_rates, *esupp_rates = NULL;
149 int i;
150
151 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
152 sdata->u.sta.ie_probereq_len);
153 if (!skb) {
154 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
155 "request\n", sdata->dev->name);
156 return;
157 }
158 skb_reserve(skb, local->hw.extra_tx_headroom);
159
160 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
161 memset(mgmt, 0, 24);
162 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
163 IEEE80211_STYPE_PROBE_REQ);
164 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
165 if (dst) {
166 memcpy(mgmt->da, dst, ETH_ALEN);
167 memcpy(mgmt->bssid, dst, ETH_ALEN);
168 } else {
169 memset(mgmt->da, 0xff, ETH_ALEN);
170 memset(mgmt->bssid, 0xff, ETH_ALEN);
171 }
172 pos = skb_put(skb, 2 + ssid_len);
173 *pos++ = WLAN_EID_SSID;
174 *pos++ = ssid_len;
175 memcpy(pos, ssid, ssid_len);
176
177 supp_rates = skb_put(skb, 2);
178 supp_rates[0] = WLAN_EID_SUPP_RATES;
179 supp_rates[1] = 0;
180 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
181
182 for (i = 0; i < sband->n_bitrates; i++) {
183 struct ieee80211_rate *rate = &sband->bitrates[i];
184 if (esupp_rates) {
185 pos = skb_put(skb, 1);
186 esupp_rates[1]++;
187 } else if (supp_rates[1] == 8) {
188 esupp_rates = skb_put(skb, 3);
189 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
190 esupp_rates[1] = 1;
191 pos = &esupp_rates[2];
192 } else {
193 pos = skb_put(skb, 1);
194 supp_rates[1]++;
195 }
196 *pos = rate->bitrate / 5;
197 }
198
199 add_extra_ies(skb, sdata->u.sta.ie_probereq,
200 sdata->u.sta.ie_probereq_len);
201
202 ieee80211_tx_skb(sdata, skb, 0);
203 }
204
205 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
206 struct ieee80211_if_sta *ifsta,
207 int transaction, u8 *extra, size_t extra_len,
208 int encrypt)
209 {
210 struct ieee80211_local *local = sdata->local;
211 struct sk_buff *skb;
212 struct ieee80211_mgmt *mgmt;
213
214 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
215 sizeof(*mgmt) + 6 + extra_len +
216 sdata->u.sta.ie_auth_len);
217 if (!skb) {
218 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
219 "frame\n", sdata->dev->name);
220 return;
221 }
222 skb_reserve(skb, local->hw.extra_tx_headroom);
223
224 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
225 memset(mgmt, 0, 24 + 6);
226 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
227 IEEE80211_STYPE_AUTH);
228 if (encrypt)
229 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
230 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
231 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
232 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
233 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
234 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
235 ifsta->auth_transaction = transaction + 1;
236 mgmt->u.auth.status_code = cpu_to_le16(0);
237 if (extra)
238 memcpy(skb_put(skb, extra_len), extra, extra_len);
239 add_extra_ies(skb, sdata->u.sta.ie_auth, sdata->u.sta.ie_auth_len);
240
241 ieee80211_tx_skb(sdata, skb, encrypt);
242 }
243
244 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
245 struct ieee80211_if_sta *ifsta)
246 {
247 struct ieee80211_local *local = sdata->local;
248 struct sk_buff *skb;
249 struct ieee80211_mgmt *mgmt;
250 u8 *pos, *ies, *ht_ie, *e_ies;
251 int i, len, count, rates_len, supp_rates_len;
252 u16 capab;
253 struct ieee80211_bss *bss;
254 int wmm = 0;
255 struct ieee80211_supported_band *sband;
256 u32 rates = 0;
257 size_t e_ies_len;
258
259 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
260 e_ies = sdata->u.sta.ie_reassocreq;
261 e_ies_len = sdata->u.sta.ie_reassocreq_len;
262 } else {
263 e_ies = sdata->u.sta.ie_assocreq;
264 e_ies_len = sdata->u.sta.ie_assocreq_len;
265 }
266
267 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
268 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
269 ifsta->ssid_len + e_ies_len);
270 if (!skb) {
271 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
272 "frame\n", sdata->dev->name);
273 return;
274 }
275 skb_reserve(skb, local->hw.extra_tx_headroom);
276
277 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
278
279 capab = ifsta->capab;
280
281 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
282 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
283 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
284 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
285 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
286 }
287
288 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
289 local->hw.conf.channel->center_freq,
290 ifsta->ssid, ifsta->ssid_len);
291 if (bss) {
292 if (bss->cbss.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->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
304 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
305 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
306
307 ieee80211_rx_bss_put(local, bss);
308 } else {
309 rates = ~0;
310 rates_len = sband->n_bitrates;
311 }
312
313 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
314 memset(mgmt, 0, 24);
315 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
316 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
317 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
318
319 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
320 skb_put(skb, 10);
321 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
322 IEEE80211_STYPE_REASSOC_REQ);
323 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
324 mgmt->u.reassoc_req.listen_interval =
325 cpu_to_le16(local->hw.conf.listen_interval);
326 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
327 ETH_ALEN);
328 } else {
329 skb_put(skb, 4);
330 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
331 IEEE80211_STYPE_ASSOC_REQ);
332 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
333 mgmt->u.assoc_req.listen_interval =
334 cpu_to_le16(local->hw.conf.listen_interval);
335 }
336
337 /* SSID */
338 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
339 *pos++ = WLAN_EID_SSID;
340 *pos++ = ifsta->ssid_len;
341 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
342
343 /* add all rates which were marked to be used above */
344 supp_rates_len = rates_len;
345 if (supp_rates_len > 8)
346 supp_rates_len = 8;
347
348 len = sband->n_bitrates;
349 pos = skb_put(skb, supp_rates_len + 2);
350 *pos++ = WLAN_EID_SUPP_RATES;
351 *pos++ = supp_rates_len;
352
353 count = 0;
354 for (i = 0; i < sband->n_bitrates; i++) {
355 if (BIT(i) & rates) {
356 int rate = sband->bitrates[i].bitrate;
357 *pos++ = (u8) (rate / 5);
358 if (++count == 8)
359 break;
360 }
361 }
362
363 if (rates_len > count) {
364 pos = skb_put(skb, rates_len - count + 2);
365 *pos++ = WLAN_EID_EXT_SUPP_RATES;
366 *pos++ = rates_len - count;
367
368 for (i++; i < sband->n_bitrates; i++) {
369 if (BIT(i) & rates) {
370 int rate = sband->bitrates[i].bitrate;
371 *pos++ = (u8) (rate / 5);
372 }
373 }
374 }
375
376 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
377 /* 1. power capabilities */
378 pos = skb_put(skb, 4);
379 *pos++ = WLAN_EID_PWR_CAPABILITY;
380 *pos++ = 2;
381 *pos++ = 0; /* min tx power */
382 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
383
384 /* 2. supported channels */
385 /* TODO: get this in reg domain format */
386 pos = skb_put(skb, 2 * sband->n_channels + 2);
387 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
388 *pos++ = 2 * sband->n_channels;
389 for (i = 0; i < sband->n_channels; i++) {
390 *pos++ = ieee80211_frequency_to_channel(
391 sband->channels[i].center_freq);
392 *pos++ = 1; /* one channel in the subband*/
393 }
394 }
395
396 if (ifsta->extra_ie) {
397 pos = skb_put(skb, ifsta->extra_ie_len);
398 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
399 }
400
401 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
402 pos = skb_put(skb, 9);
403 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
404 *pos++ = 7; /* len */
405 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
406 *pos++ = 0x50;
407 *pos++ = 0xf2;
408 *pos++ = 2; /* WME */
409 *pos++ = 0; /* WME info */
410 *pos++ = 1; /* WME ver */
411 *pos++ = 0;
412 }
413
414 /* wmm support is a must to HT */
415 /*
416 * IEEE802.11n does not allow TKIP/WEP as pairwise
417 * ciphers in HT mode. We still associate in non-ht
418 * mode (11a/b/g) if any one of these ciphers is
419 * configured as pairwise.
420 */
421 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
422 sband->ht_cap.ht_supported &&
423 (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
424 ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
425 (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
426 struct ieee80211_ht_info *ht_info =
427 (struct ieee80211_ht_info *)(ht_ie + 2);
428 u16 cap = sband->ht_cap.cap;
429 __le16 tmp;
430 u32 flags = local->hw.conf.channel->flags;
431
432 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
433 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
434 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
435 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
436 cap &= ~IEEE80211_HT_CAP_SGI_40;
437 }
438 break;
439 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
440 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
441 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
442 cap &= ~IEEE80211_HT_CAP_SGI_40;
443 }
444 break;
445 }
446
447 tmp = cpu_to_le16(cap);
448 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
449 *pos++ = WLAN_EID_HT_CAPABILITY;
450 *pos++ = sizeof(struct ieee80211_ht_cap);
451 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
452 memcpy(pos, &tmp, sizeof(u16));
453 pos += sizeof(u16);
454 /* TODO: needs a define here for << 2 */
455 *pos++ = sband->ht_cap.ampdu_factor |
456 (sband->ht_cap.ampdu_density << 2);
457 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
458 }
459
460 add_extra_ies(skb, e_ies, e_ies_len);
461
462 kfree(ifsta->assocreq_ies);
463 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
464 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
465 if (ifsta->assocreq_ies)
466 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
467
468 ieee80211_tx_skb(sdata, skb, 0);
469 }
470
471
472 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
473 u16 stype, u16 reason)
474 {
475 struct ieee80211_local *local = sdata->local;
476 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
477 struct sk_buff *skb;
478 struct ieee80211_mgmt *mgmt;
479 u8 *ies;
480 size_t ies_len;
481
482 if (stype == IEEE80211_STYPE_DEAUTH) {
483 ies = sdata->u.sta.ie_deauth;
484 ies_len = sdata->u.sta.ie_deauth_len;
485 } else {
486 ies = sdata->u.sta.ie_disassoc;
487 ies_len = sdata->u.sta.ie_disassoc_len;
488 }
489
490 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) +
491 ies_len);
492 if (!skb) {
493 printk(KERN_DEBUG "%s: failed to allocate buffer for "
494 "deauth/disassoc frame\n", sdata->dev->name);
495 return;
496 }
497 skb_reserve(skb, local->hw.extra_tx_headroom);
498
499 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
500 memset(mgmt, 0, 24);
501 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
502 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
503 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
504 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
505 skb_put(skb, 2);
506 /* u.deauth.reason_code == u.disassoc.reason_code */
507 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
508
509 add_extra_ies(skb, ies, ies_len);
510
511 ieee80211_tx_skb(sdata, skb, ifsta->flags & IEEE80211_STA_MFP_ENABLED);
512 }
513
514 void ieee80211_send_pspoll(struct ieee80211_local *local,
515 struct ieee80211_sub_if_data *sdata)
516 {
517 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
518 struct ieee80211_pspoll *pspoll;
519 struct sk_buff *skb;
520 u16 fc;
521
522 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
523 if (!skb) {
524 printk(KERN_DEBUG "%s: failed to allocate buffer for "
525 "pspoll frame\n", sdata->dev->name);
526 return;
527 }
528 skb_reserve(skb, local->hw.extra_tx_headroom);
529
530 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
531 memset(pspoll, 0, sizeof(*pspoll));
532 fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
533 pspoll->frame_control = cpu_to_le16(fc);
534 pspoll->aid = cpu_to_le16(ifsta->aid);
535
536 /* aid in PS-Poll has its two MSBs each set to 1 */
537 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
538
539 memcpy(pspoll->bssid, ifsta->bssid, ETH_ALEN);
540 memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
541
542 ieee80211_tx_skb(sdata, skb, 0);
543
544 return;
545 }
546
547 /* MLME */
548 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
549 const size_t supp_rates_len,
550 const u8 *supp_rates)
551 {
552 struct ieee80211_local *local = sdata->local;
553 int i, have_higher_than_11mbit = 0;
554
555 /* cf. IEEE 802.11 9.2.12 */
556 for (i = 0; i < supp_rates_len; i++)
557 if ((supp_rates[i] & 0x7f) * 5 > 110)
558 have_higher_than_11mbit = 1;
559
560 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
561 have_higher_than_11mbit)
562 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
563 else
564 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
565
566 ieee80211_set_wmm_default(sdata);
567 }
568
569 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
570 struct ieee80211_if_sta *ifsta,
571 u8 *wmm_param, size_t wmm_param_len)
572 {
573 struct ieee80211_tx_queue_params params;
574 size_t left;
575 int count;
576 u8 *pos;
577
578 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
579 return;
580
581 if (!wmm_param)
582 return;
583
584 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
585 return;
586 count = wmm_param[6] & 0x0f;
587 if (count == ifsta->wmm_last_param_set)
588 return;
589 ifsta->wmm_last_param_set = count;
590
591 pos = wmm_param + 8;
592 left = wmm_param_len - 8;
593
594 memset(&params, 0, sizeof(params));
595
596 if (!local->ops->conf_tx)
597 return;
598
599 local->wmm_acm = 0;
600 for (; left >= 4; left -= 4, pos += 4) {
601 int aci = (pos[0] >> 5) & 0x03;
602 int acm = (pos[0] >> 4) & 0x01;
603 int queue;
604
605 switch (aci) {
606 case 1:
607 queue = 3;
608 if (acm)
609 local->wmm_acm |= BIT(0) | BIT(3);
610 break;
611 case 2:
612 queue = 1;
613 if (acm)
614 local->wmm_acm |= BIT(4) | BIT(5);
615 break;
616 case 3:
617 queue = 0;
618 if (acm)
619 local->wmm_acm |= BIT(6) | BIT(7);
620 break;
621 case 0:
622 default:
623 queue = 2;
624 if (acm)
625 local->wmm_acm |= BIT(1) | BIT(2);
626 break;
627 }
628
629 params.aifs = pos[0] & 0x0f;
630 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
631 params.cw_min = ecw2cw(pos[1] & 0x0f);
632 params.txop = get_unaligned_le16(pos + 2);
633 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
634 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
635 "cWmin=%d cWmax=%d txop=%d\n",
636 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
637 params.cw_max, params.txop);
638 #endif
639 /* TODO: handle ACM (block TX, fallback to next lowest allowed
640 * AC for now) */
641 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
642 printk(KERN_DEBUG "%s: failed to set TX queue "
643 "parameters for queue %d\n", local->mdev->name, queue);
644 }
645 }
646 }
647
648 static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
649 {
650 u8 mask;
651 u8 index, indexn1, indexn2;
652 struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
653
654 aid &= 0x3fff;
655 index = aid / 8;
656 mask = 1 << (aid & 7);
657
658 indexn1 = tim->bitmap_ctrl & 0xfe;
659 indexn2 = elems->tim_len + indexn1 - 4;
660
661 if (index < indexn1 || index > indexn2)
662 return false;
663
664 index -= indexn1;
665
666 return !!(tim->virtual_map[index] & mask);
667 }
668
669 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
670 u16 capab, bool erp_valid, u8 erp)
671 {
672 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
673 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
674 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
675 #endif
676 u32 changed = 0;
677 bool use_protection;
678 bool use_short_preamble;
679 bool use_short_slot;
680
681 if (erp_valid) {
682 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
683 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
684 } else {
685 use_protection = false;
686 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
687 }
688
689 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
690
691 if (use_protection != bss_conf->use_cts_prot) {
692 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
693 if (net_ratelimit()) {
694 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
695 sdata->dev->name,
696 use_protection ? "enabled" : "disabled",
697 ifsta->bssid);
698 }
699 #endif
700 bss_conf->use_cts_prot = use_protection;
701 changed |= BSS_CHANGED_ERP_CTS_PROT;
702 }
703
704 if (use_short_preamble != bss_conf->use_short_preamble) {
705 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
706 if (net_ratelimit()) {
707 printk(KERN_DEBUG "%s: switched to %s barker preamble"
708 " (BSSID=%pM)\n",
709 sdata->dev->name,
710 use_short_preamble ? "short" : "long",
711 ifsta->bssid);
712 }
713 #endif
714 bss_conf->use_short_preamble = use_short_preamble;
715 changed |= BSS_CHANGED_ERP_PREAMBLE;
716 }
717
718 if (use_short_slot != bss_conf->use_short_slot) {
719 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
720 if (net_ratelimit()) {
721 printk(KERN_DEBUG "%s: switched to %s slot time"
722 " (BSSID=%pM)\n",
723 sdata->dev->name,
724 use_short_slot ? "short" : "long",
725 ifsta->bssid);
726 }
727 #endif
728 bss_conf->use_short_slot = use_short_slot;
729 changed |= BSS_CHANGED_ERP_SLOT;
730 }
731
732 return changed;
733 }
734
735 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
736 struct ieee80211_if_sta *ifsta)
737 {
738 union iwreq_data wrqu;
739 memset(&wrqu, 0, sizeof(wrqu));
740 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
741 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
742 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
743 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
744 }
745
746 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
747 struct ieee80211_if_sta *ifsta)
748 {
749 char *buf;
750 size_t len;
751 int i;
752 union iwreq_data wrqu;
753
754 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
755 return;
756
757 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
758 ifsta->assocresp_ies_len), GFP_KERNEL);
759 if (!buf)
760 return;
761
762 len = sprintf(buf, "ASSOCINFO(");
763 if (ifsta->assocreq_ies) {
764 len += sprintf(buf + len, "ReqIEs=");
765 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
766 len += sprintf(buf + len, "%02x",
767 ifsta->assocreq_ies[i]);
768 }
769 }
770 if (ifsta->assocresp_ies) {
771 if (ifsta->assocreq_ies)
772 len += sprintf(buf + len, " ");
773 len += sprintf(buf + len, "RespIEs=");
774 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
775 len += sprintf(buf + len, "%02x",
776 ifsta->assocresp_ies[i]);
777 }
778 }
779 len += sprintf(buf + len, ")");
780
781 if (len > IW_CUSTOM_MAX) {
782 len = sprintf(buf, "ASSOCRESPIE=");
783 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
784 len += sprintf(buf + len, "%02x",
785 ifsta->assocresp_ies[i]);
786 }
787 }
788
789 if (len <= IW_CUSTOM_MAX) {
790 memset(&wrqu, 0, sizeof(wrqu));
791 wrqu.data.length = len;
792 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
793 }
794
795 kfree(buf);
796 }
797
798
799 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
800 struct ieee80211_if_sta *ifsta,
801 u32 bss_info_changed)
802 {
803 struct ieee80211_local *local = sdata->local;
804 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
805
806 struct ieee80211_bss *bss;
807
808 bss_info_changed |= BSS_CHANGED_ASSOC;
809 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
810
811 if (sdata->vif.type != NL80211_IFTYPE_STATION)
812 return;
813
814 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
815 conf->channel->center_freq,
816 ifsta->ssid, ifsta->ssid_len);
817 if (bss) {
818 /* set timing information */
819 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
820 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
821 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
822
823 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
824 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
825
826 ieee80211_rx_bss_put(local, bss);
827 }
828
829 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
830 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
831 ieee80211_sta_send_associnfo(sdata, ifsta);
832
833 ifsta->last_probe = jiffies;
834 ieee80211_led_assoc(local, 1);
835
836 sdata->vif.bss_conf.assoc = 1;
837 /*
838 * For now just always ask the driver to update the basic rateset
839 * when we have associated, we aren't checking whether it actually
840 * changed or not.
841 */
842 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
843 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
844
845 if (local->powersave) {
846 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
847 local->hw.conf.dynamic_ps_timeout > 0) {
848 mod_timer(&local->dynamic_ps_timer, jiffies +
849 msecs_to_jiffies(
850 local->hw.conf.dynamic_ps_timeout));
851 } else {
852 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
853 ieee80211_send_nullfunc(local, sdata, 1);
854 conf->flags |= IEEE80211_CONF_PS;
855 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
856 }
857 }
858
859 netif_tx_start_all_queues(sdata->dev);
860 netif_carrier_on(sdata->dev);
861
862 ieee80211_sta_send_apinfo(sdata, ifsta);
863 }
864
865 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
866 struct ieee80211_if_sta *ifsta)
867 {
868 ifsta->direct_probe_tries++;
869 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
870 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
871 sdata->dev->name, ifsta->bssid);
872 ifsta->state = IEEE80211_STA_MLME_DISABLED;
873 ieee80211_sta_send_apinfo(sdata, ifsta);
874
875 /*
876 * Most likely AP is not in the range so remove the
877 * bss information associated to the AP
878 */
879 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
880 sdata->local->hw.conf.channel->center_freq,
881 ifsta->ssid, ifsta->ssid_len);
882 return;
883 }
884
885 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
886 sdata->dev->name, ifsta->bssid,
887 ifsta->direct_probe_tries);
888
889 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
890
891 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
892
893 /* Direct probe is sent to broadcast address as some APs
894 * will not answer to direct packet in unassociated state.
895 */
896 ieee80211_send_probe_req(sdata, NULL,
897 ifsta->ssid, ifsta->ssid_len);
898
899 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
900 }
901
902
903 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
904 struct ieee80211_if_sta *ifsta)
905 {
906 ifsta->auth_tries++;
907 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
908 printk(KERN_DEBUG "%s: authentication with AP %pM"
909 " timed out\n",
910 sdata->dev->name, ifsta->bssid);
911 ifsta->state = IEEE80211_STA_MLME_DISABLED;
912 ieee80211_sta_send_apinfo(sdata, ifsta);
913 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
914 sdata->local->hw.conf.channel->center_freq,
915 ifsta->ssid, ifsta->ssid_len);
916 return;
917 }
918
919 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
920 printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
921 sdata->dev->name, ifsta->bssid);
922
923 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
924
925 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
926 }
927
928 /*
929 * The disassoc 'reason' argument can be either our own reason
930 * if self disconnected or a reason code from the AP.
931 */
932 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
933 struct ieee80211_if_sta *ifsta, bool deauth,
934 bool self_disconnected, u16 reason)
935 {
936 struct ieee80211_local *local = sdata->local;
937 struct sta_info *sta;
938 u32 changed = 0, config_changed = 0;
939
940 rcu_read_lock();
941
942 sta = sta_info_get(local, ifsta->bssid);
943 if (!sta) {
944 rcu_read_unlock();
945 return;
946 }
947
948 if (deauth) {
949 ifsta->direct_probe_tries = 0;
950 ifsta->auth_tries = 0;
951 }
952 ifsta->assoc_scan_tries = 0;
953 ifsta->assoc_tries = 0;
954
955 netif_tx_stop_all_queues(sdata->dev);
956 netif_carrier_off(sdata->dev);
957
958 ieee80211_sta_tear_down_BA_sessions(sta);
959
960 if (self_disconnected) {
961 if (deauth)
962 ieee80211_send_deauth_disassoc(sdata,
963 IEEE80211_STYPE_DEAUTH, reason);
964 else
965 ieee80211_send_deauth_disassoc(sdata,
966 IEEE80211_STYPE_DISASSOC, reason);
967 }
968
969 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
970 changed |= ieee80211_reset_erp_info(sdata);
971
972 ieee80211_led_assoc(local, 0);
973 changed |= BSS_CHANGED_ASSOC;
974 sdata->vif.bss_conf.assoc = false;
975
976 ieee80211_sta_send_apinfo(sdata, ifsta);
977
978 if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
979 ifsta->state = IEEE80211_STA_MLME_DISABLED;
980 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
981 sdata->local->hw.conf.channel->center_freq,
982 ifsta->ssid, ifsta->ssid_len);
983 }
984
985 rcu_read_unlock();
986
987 /* channel(_type) changes are handled by ieee80211_hw_config */
988 local->oper_channel_type = NL80211_CHAN_NO_HT;
989
990 local->power_constr_level = 0;
991
992 del_timer_sync(&local->dynamic_ps_timer);
993 cancel_work_sync(&local->dynamic_ps_enable_work);
994
995 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
996 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
997 config_changed |= IEEE80211_CONF_CHANGE_PS;
998 }
999
1000 ieee80211_hw_config(local, config_changed);
1001 ieee80211_bss_info_change_notify(sdata, changed);
1002
1003 rcu_read_lock();
1004
1005 sta = sta_info_get(local, ifsta->bssid);
1006 if (!sta) {
1007 rcu_read_unlock();
1008 return;
1009 }
1010
1011 sta_info_unlink(&sta);
1012
1013 rcu_read_unlock();
1014
1015 sta_info_destroy(sta);
1016 }
1017
1018 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1019 {
1020 if (!sdata || !sdata->default_key ||
1021 sdata->default_key->conf.alg != ALG_WEP)
1022 return 0;
1023 return 1;
1024 }
1025
1026 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
1027 struct ieee80211_if_sta *ifsta)
1028 {
1029 struct ieee80211_local *local = sdata->local;
1030 struct ieee80211_bss *bss;
1031 int bss_privacy;
1032 int wep_privacy;
1033 int privacy_invoked;
1034
1035 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
1036 return 0;
1037
1038 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1039 local->hw.conf.channel->center_freq,
1040 ifsta->ssid, ifsta->ssid_len);
1041 if (!bss)
1042 return 0;
1043
1044 bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
1045 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1046 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
1047
1048 ieee80211_rx_bss_put(local, bss);
1049
1050 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1051 return 0;
1052
1053 return 1;
1054 }
1055
1056 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1057 struct ieee80211_if_sta *ifsta)
1058 {
1059 ifsta->assoc_tries++;
1060 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1061 printk(KERN_DEBUG "%s: association with AP %pM"
1062 " timed out\n",
1063 sdata->dev->name, ifsta->bssid);
1064 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1065 ieee80211_sta_send_apinfo(sdata, ifsta);
1066 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
1067 sdata->local->hw.conf.channel->center_freq,
1068 ifsta->ssid, ifsta->ssid_len);
1069 return;
1070 }
1071
1072 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1073 printk(KERN_DEBUG "%s: associate with AP %pM\n",
1074 sdata->dev->name, ifsta->bssid);
1075 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1076 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1077 "mixed-cell disabled - abort association\n", sdata->dev->name);
1078 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1079 return;
1080 }
1081
1082 ieee80211_send_assoc(sdata, ifsta);
1083
1084 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1085 }
1086
1087
1088 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1089 struct ieee80211_if_sta *ifsta)
1090 {
1091 struct ieee80211_local *local = sdata->local;
1092 struct sta_info *sta;
1093 int disassoc;
1094
1095 /* TODO: start monitoring current AP signal quality and number of
1096 * missed beacons. Scan other channels every now and then and search
1097 * for better APs. */
1098 /* TODO: remove expired BSSes */
1099
1100 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1101
1102 rcu_read_lock();
1103
1104 sta = sta_info_get(local, ifsta->bssid);
1105 if (!sta) {
1106 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1107 sdata->dev->name, ifsta->bssid);
1108 disassoc = 1;
1109 } else {
1110 disassoc = 0;
1111 if (time_after(jiffies,
1112 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1113 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1114 printk(KERN_DEBUG "%s: No ProbeResp from "
1115 "current AP %pM - assume out of "
1116 "range\n",
1117 sdata->dev->name, ifsta->bssid);
1118 disassoc = 1;
1119 } else
1120 ieee80211_send_probe_req(sdata, ifsta->bssid,
1121 ifsta->ssid,
1122 ifsta->ssid_len);
1123 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1124 } else {
1125 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1126 if (time_after(jiffies, ifsta->last_probe +
1127 IEEE80211_PROBE_INTERVAL)) {
1128 ifsta->last_probe = jiffies;
1129 ieee80211_send_probe_req(sdata, ifsta->bssid,
1130 ifsta->ssid,
1131 ifsta->ssid_len);
1132 }
1133 }
1134 }
1135
1136 rcu_read_unlock();
1137
1138 if (disassoc)
1139 ieee80211_set_disassoc(sdata, ifsta, true, true,
1140 WLAN_REASON_PREV_AUTH_NOT_VALID);
1141 else
1142 mod_timer(&ifsta->timer, jiffies +
1143 IEEE80211_MONITORING_INTERVAL);
1144 }
1145
1146
1147 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1148 struct ieee80211_if_sta *ifsta)
1149 {
1150 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1151 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1152 ieee80211_associate(sdata, ifsta);
1153 }
1154
1155
1156 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1157 struct ieee80211_if_sta *ifsta,
1158 struct ieee80211_mgmt *mgmt,
1159 size_t len)
1160 {
1161 u8 *pos;
1162 struct ieee802_11_elems elems;
1163
1164 pos = mgmt->u.auth.variable;
1165 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1166 if (!elems.challenge)
1167 return;
1168 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1169 elems.challenge_len + 2, 1);
1170 }
1171
1172 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1173 struct ieee80211_if_sta *ifsta,
1174 struct ieee80211_mgmt *mgmt,
1175 size_t len)
1176 {
1177 u16 auth_alg, auth_transaction, status_code;
1178
1179 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1180 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1181 return;
1182
1183 if (len < 24 + 6)
1184 return;
1185
1186 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1187 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1188 return;
1189
1190 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1191 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1192 return;
1193
1194 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1195 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1196 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1197
1198 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1199 /*
1200 * IEEE 802.11 standard does not require authentication in IBSS
1201 * networks and most implementations do not seem to use it.
1202 * However, try to reply to authentication attempts if someone
1203 * has actually implemented this.
1204 */
1205 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1206 return;
1207 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1208 return;
1209 }
1210
1211 if (auth_alg != ifsta->auth_alg ||
1212 auth_transaction != ifsta->auth_transaction)
1213 return;
1214
1215 if (status_code != WLAN_STATUS_SUCCESS) {
1216 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1217 u8 algs[3];
1218 const int num_algs = ARRAY_SIZE(algs);
1219 int i, pos;
1220 algs[0] = algs[1] = algs[2] = 0xff;
1221 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1222 algs[0] = WLAN_AUTH_OPEN;
1223 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1224 algs[1] = WLAN_AUTH_SHARED_KEY;
1225 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1226 algs[2] = WLAN_AUTH_LEAP;
1227 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1228 pos = 0;
1229 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1230 pos = 1;
1231 else
1232 pos = 2;
1233 for (i = 0; i < num_algs; i++) {
1234 pos++;
1235 if (pos >= num_algs)
1236 pos = 0;
1237 if (algs[pos] == ifsta->auth_alg ||
1238 algs[pos] == 0xff)
1239 continue;
1240 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1241 !ieee80211_sta_wep_configured(sdata))
1242 continue;
1243 ifsta->auth_alg = algs[pos];
1244 break;
1245 }
1246 }
1247 return;
1248 }
1249
1250 switch (ifsta->auth_alg) {
1251 case WLAN_AUTH_OPEN:
1252 case WLAN_AUTH_LEAP:
1253 ieee80211_auth_completed(sdata, ifsta);
1254 break;
1255 case WLAN_AUTH_SHARED_KEY:
1256 if (ifsta->auth_transaction == 4)
1257 ieee80211_auth_completed(sdata, ifsta);
1258 else
1259 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1260 break;
1261 }
1262 }
1263
1264
1265 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1266 struct ieee80211_if_sta *ifsta,
1267 struct ieee80211_mgmt *mgmt,
1268 size_t len)
1269 {
1270 u16 reason_code;
1271
1272 if (len < 24 + 2)
1273 return;
1274
1275 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1276 return;
1277
1278 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1279
1280 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1281 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1282 sdata->dev->name, reason_code);
1283
1284 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1285 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1286 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1287 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1288 mod_timer(&ifsta->timer, jiffies +
1289 IEEE80211_RETRY_AUTH_INTERVAL);
1290 }
1291
1292 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1293 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1294 }
1295
1296
1297 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1298 struct ieee80211_if_sta *ifsta,
1299 struct ieee80211_mgmt *mgmt,
1300 size_t len)
1301 {
1302 u16 reason_code;
1303
1304 if (len < 24 + 2)
1305 return;
1306
1307 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1308 return;
1309
1310 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1311
1312 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1313 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1314 sdata->dev->name, reason_code);
1315
1316 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1317 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1318 mod_timer(&ifsta->timer, jiffies +
1319 IEEE80211_RETRY_AUTH_INTERVAL);
1320 }
1321
1322 ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1323 }
1324
1325
1326 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1327 struct ieee80211_if_sta *ifsta,
1328 struct ieee80211_mgmt *mgmt,
1329 size_t len,
1330 int reassoc)
1331 {
1332 struct ieee80211_local *local = sdata->local;
1333 struct ieee80211_supported_band *sband;
1334 struct sta_info *sta;
1335 u32 rates, basic_rates;
1336 u16 capab_info, status_code, aid;
1337 struct ieee802_11_elems elems;
1338 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1339 u8 *pos;
1340 u32 changed = 0;
1341 int i, j;
1342 bool have_higher_than_11mbit = false, newsta = false;
1343 u16 ap_ht_cap_flags;
1344
1345 /* AssocResp and ReassocResp have identical structure, so process both
1346 * of them in this function. */
1347
1348 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1349 return;
1350
1351 if (len < 24 + 6)
1352 return;
1353
1354 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1355 return;
1356
1357 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1358 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1359 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1360
1361 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1362 "status=%d aid=%d)\n",
1363 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1364 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1365
1366 pos = mgmt->u.assoc_resp.variable;
1367 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1368
1369 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1370 elems.timeout_int && elems.timeout_int_len == 5 &&
1371 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1372 u32 tu, ms;
1373 tu = get_unaligned_le32(elems.timeout_int + 1);
1374 ms = tu * 1024 / 1000;
1375 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1376 "comeback duration %u TU (%u ms)\n",
1377 sdata->dev->name, tu, ms);
1378 if (ms > IEEE80211_ASSOC_TIMEOUT)
1379 mod_timer(&ifsta->timer,
1380 jiffies + msecs_to_jiffies(ms));
1381 return;
1382 }
1383
1384 if (status_code != WLAN_STATUS_SUCCESS) {
1385 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1386 sdata->dev->name, status_code);
1387 /* if this was a reassociation, ensure we try a "full"
1388 * association next time. This works around some broken APs
1389 * which do not correctly reject reassociation requests. */
1390 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1391 return;
1392 }
1393
1394 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1395 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1396 "set\n", sdata->dev->name, aid);
1397 aid &= ~(BIT(15) | BIT(14));
1398
1399 if (!elems.supp_rates) {
1400 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1401 sdata->dev->name);
1402 return;
1403 }
1404
1405 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1406 ifsta->aid = aid;
1407 ifsta->ap_capab = capab_info;
1408
1409 kfree(ifsta->assocresp_ies);
1410 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1411 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1412 if (ifsta->assocresp_ies)
1413 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1414
1415 rcu_read_lock();
1416
1417 /* Add STA entry for the AP */
1418 sta = sta_info_get(local, ifsta->bssid);
1419 if (!sta) {
1420 newsta = true;
1421
1422 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1423 if (!sta) {
1424 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1425 " the AP\n", sdata->dev->name);
1426 rcu_read_unlock();
1427 return;
1428 }
1429
1430 /* update new sta with its last rx activity */
1431 sta->last_rx = jiffies;
1432 }
1433
1434 /*
1435 * FIXME: Do we really need to update the sta_info's information here?
1436 * We already know about the AP (we found it in our list) so it
1437 * should already be filled with the right info, no?
1438 * As is stands, all this is racy because typically we assume
1439 * the information that is filled in here (except flags) doesn't
1440 * change while a STA structure is alive. As such, it should move
1441 * to between the sta_info_alloc() and sta_info_insert() above.
1442 */
1443
1444 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1445 WLAN_STA_AUTHORIZED);
1446
1447 rates = 0;
1448 basic_rates = 0;
1449 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1450
1451 for (i = 0; i < elems.supp_rates_len; i++) {
1452 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1453 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1454
1455 if (rate > 110)
1456 have_higher_than_11mbit = true;
1457
1458 for (j = 0; j < sband->n_bitrates; j++) {
1459 if (sband->bitrates[j].bitrate == rate) {
1460 rates |= BIT(j);
1461 if (is_basic)
1462 basic_rates |= BIT(j);
1463 break;
1464 }
1465 }
1466 }
1467
1468 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1469 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1470 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1471
1472 if (rate > 110)
1473 have_higher_than_11mbit = true;
1474
1475 for (j = 0; j < sband->n_bitrates; j++) {
1476 if (sband->bitrates[j].bitrate == rate) {
1477 rates |= BIT(j);
1478 if (is_basic)
1479 basic_rates |= BIT(j);
1480 break;
1481 }
1482 }
1483 }
1484
1485 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1486 sdata->vif.bss_conf.basic_rates = basic_rates;
1487
1488 /* cf. IEEE 802.11 9.2.12 */
1489 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1490 have_higher_than_11mbit)
1491 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1492 else
1493 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1494
1495 if (elems.ht_cap_elem)
1496 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1497 elems.ht_cap_elem, &sta->sta.ht_cap);
1498
1499 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1500
1501 rate_control_rate_init(sta);
1502
1503 if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
1504 set_sta_flags(sta, WLAN_STA_MFP);
1505
1506 if (elems.wmm_param)
1507 set_sta_flags(sta, WLAN_STA_WME);
1508
1509 if (newsta) {
1510 int err = sta_info_insert(sta);
1511 if (err) {
1512 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1513 " the AP (error %d)\n", sdata->dev->name, err);
1514 rcu_read_unlock();
1515 return;
1516 }
1517 }
1518
1519 rcu_read_unlock();
1520
1521 if (elems.wmm_param)
1522 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1523 elems.wmm_param_len);
1524
1525 if (elems.ht_info_elem && elems.wmm_param &&
1526 (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1527 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1528 ap_ht_cap_flags);
1529
1530 /* set AID and assoc capability,
1531 * ieee80211_set_associated() will tell the driver */
1532 bss_conf->aid = aid;
1533 bss_conf->assoc_capability = capab_info;
1534 ieee80211_set_associated(sdata, ifsta, changed);
1535
1536 ieee80211_associated(sdata, ifsta);
1537 }
1538
1539
1540 static int __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1541 struct ieee80211_if_sta *ifsta,
1542 const u8 *bssid, const int beacon_int,
1543 const int freq,
1544 const size_t supp_rates_len,
1545 const u8 *supp_rates,
1546 const u16 capability)
1547 {
1548 struct ieee80211_local *local = sdata->local;
1549 int res = 0, rates, i, j;
1550 struct sk_buff *skb;
1551 struct ieee80211_mgmt *mgmt;
1552 u8 *pos;
1553 struct ieee80211_supported_band *sband;
1554 union iwreq_data wrqu;
1555
1556 if (local->ops->reset_tsf) {
1557 /* Reset own TSF to allow time synchronization work. */
1558 local->ops->reset_tsf(local_to_hw(local));
1559 }
1560
1561 if ((ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) &&
1562 memcmp(ifsta->bssid, bssid, ETH_ALEN) == 0)
1563 return res;
1564
1565 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
1566 sdata->u.sta.ie_proberesp_len);
1567 if (!skb) {
1568 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1569 "response\n", sdata->dev->name);
1570 return -ENOMEM;
1571 }
1572
1573 if (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) {
1574 /* Remove possible STA entries from other IBSS networks. */
1575 sta_info_flush_delayed(sdata);
1576 }
1577
1578 memcpy(ifsta->bssid, bssid, ETH_ALEN);
1579 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1580 if (res)
1581 return res;
1582
1583 local->hw.conf.beacon_int = beacon_int >= 10 ? beacon_int : 10;
1584
1585 sdata->drop_unencrypted = capability &
1586 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1587
1588 res = ieee80211_set_freq(sdata, freq);
1589
1590 if (res)
1591 return res;
1592
1593 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1594
1595 /* Build IBSS probe response */
1596
1597 skb_reserve(skb, local->hw.extra_tx_headroom);
1598
1599 mgmt = (struct ieee80211_mgmt *)
1600 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1601 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1602 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1603 IEEE80211_STYPE_PROBE_RESP);
1604 memset(mgmt->da, 0xff, ETH_ALEN);
1605 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1606 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1607 mgmt->u.beacon.beacon_int =
1608 cpu_to_le16(local->hw.conf.beacon_int);
1609 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
1610
1611 pos = skb_put(skb, 2 + ifsta->ssid_len);
1612 *pos++ = WLAN_EID_SSID;
1613 *pos++ = ifsta->ssid_len;
1614 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1615
1616 rates = supp_rates_len;
1617 if (rates > 8)
1618 rates = 8;
1619 pos = skb_put(skb, 2 + rates);
1620 *pos++ = WLAN_EID_SUPP_RATES;
1621 *pos++ = rates;
1622 memcpy(pos, supp_rates, rates);
1623
1624 if (sband->band == IEEE80211_BAND_2GHZ) {
1625 pos = skb_put(skb, 2 + 1);
1626 *pos++ = WLAN_EID_DS_PARAMS;
1627 *pos++ = 1;
1628 *pos++ = ieee80211_frequency_to_channel(freq);
1629 }
1630
1631 pos = skb_put(skb, 2 + 2);
1632 *pos++ = WLAN_EID_IBSS_PARAMS;
1633 *pos++ = 2;
1634 /* FIX: set ATIM window based on scan results */
1635 *pos++ = 0;
1636 *pos++ = 0;
1637
1638 if (supp_rates_len > 8) {
1639 rates = supp_rates_len - 8;
1640 pos = skb_put(skb, 2 + rates);
1641 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1642 *pos++ = rates;
1643 memcpy(pos, &supp_rates[8], rates);
1644 }
1645
1646 add_extra_ies(skb, sdata->u.sta.ie_proberesp,
1647 sdata->u.sta.ie_proberesp_len);
1648
1649 ifsta->probe_resp = skb;
1650
1651 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON |
1652 IEEE80211_IFCC_BEACON_ENABLED);
1653
1654
1655 rates = 0;
1656 for (i = 0; i < supp_rates_len; i++) {
1657 int bitrate = (supp_rates[i] & 0x7f) * 5;
1658 for (j = 0; j < sband->n_bitrates; j++)
1659 if (sband->bitrates[j].bitrate == bitrate)
1660 rates |= BIT(j);
1661 }
1662 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1663
1664 ieee80211_sta_def_wmm_params(sdata, supp_rates_len, supp_rates);
1665
1666 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
1667 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1668 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1669
1670 ieee80211_led_assoc(local, true);
1671
1672 memset(&wrqu, 0, sizeof(wrqu));
1673 memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
1674 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1675
1676 return res;
1677 }
1678
1679 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1680 struct ieee80211_if_sta *ifsta,
1681 struct ieee80211_bss *bss)
1682 {
1683 return __ieee80211_sta_join_ibss(sdata, ifsta,
1684 bss->cbss.bssid,
1685 bss->cbss.beacon_interval,
1686 bss->cbss.channel->center_freq,
1687 bss->supp_rates_len, bss->supp_rates,
1688 bss->cbss.capability);
1689 }
1690
1691 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1692 struct ieee80211_mgmt *mgmt,
1693 size_t len,
1694 struct ieee80211_rx_status *rx_status,
1695 struct ieee802_11_elems *elems,
1696 bool beacon)
1697 {
1698 struct ieee80211_local *local = sdata->local;
1699 int freq;
1700 struct ieee80211_bss *bss;
1701 struct sta_info *sta;
1702 struct ieee80211_channel *channel;
1703 u64 beacon_timestamp, rx_timestamp;
1704 u32 supp_rates = 0;
1705 enum ieee80211_band band = rx_status->band;
1706
1707 if (elems->ds_params && elems->ds_params_len == 1)
1708 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1709 else
1710 freq = rx_status->freq;
1711
1712 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1713
1714 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1715 return;
1716
1717 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1718 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1719 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1720
1721 rcu_read_lock();
1722
1723 sta = sta_info_get(local, mgmt->sa);
1724 if (sta) {
1725 u32 prev_rates;
1726
1727 prev_rates = sta->sta.supp_rates[band];
1728 /* make sure mandatory rates are always added */
1729 sta->sta.supp_rates[band] = supp_rates |
1730 ieee80211_mandatory_rates(local, band);
1731
1732 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1733 if (sta->sta.supp_rates[band] != prev_rates)
1734 printk(KERN_DEBUG "%s: updated supp_rates set "
1735 "for %pM based on beacon info (0x%llx | "
1736 "0x%llx -> 0x%llx)\n",
1737 sdata->dev->name,
1738 sta->sta.addr,
1739 (unsigned long long) prev_rates,
1740 (unsigned long long) supp_rates,
1741 (unsigned long long) sta->sta.supp_rates[band]);
1742 #endif
1743 } else {
1744 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1745 }
1746
1747 rcu_read_unlock();
1748 }
1749
1750 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1751 channel, beacon);
1752 if (!bss)
1753 return;
1754
1755 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1756 (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1757 struct ieee80211_channel_sw_ie *sw_elem =
1758 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1759 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1760 }
1761
1762 /* was just updated in ieee80211_bss_info_update */
1763 beacon_timestamp = bss->cbss.tsf;
1764
1765 /*
1766 * In STA mode, the remaining parameters should not be overridden
1767 * by beacons because they're not necessarily accurate there.
1768 */
1769 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1770 bss->last_probe_resp && beacon) {
1771 ieee80211_rx_bss_put(local, bss);
1772 return;
1773 }
1774
1775 /* check if we need to merge IBSS */
1776 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1777 (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1778 bss->cbss.capability & WLAN_CAPABILITY_IBSS &&
1779 bss->cbss.channel == local->oper_channel &&
1780 elems->ssid_len == sdata->u.sta.ssid_len &&
1781 memcmp(elems->ssid, sdata->u.sta.ssid,
1782 sdata->u.sta.ssid_len) == 0) {
1783 if (rx_status->flag & RX_FLAG_TSFT) {
1784 /* in order for correct IBSS merging we need mactime
1785 *
1786 * since mactime is defined as the time the first data
1787 * symbol of the frame hits the PHY, and the timestamp
1788 * of the beacon is defined as "the time that the data
1789 * symbol containing the first bit of the timestamp is
1790 * transmitted to the PHY plus the transmitting STA’s
1791 * delays through its local PHY from the MAC-PHY
1792 * interface to its interface with the WM"
1793 * (802.11 11.1.2) - equals the time this bit arrives at
1794 * the receiver - we have to take into account the
1795 * offset between the two.
1796 * e.g: at 1 MBit that means mactime is 192 usec earlier
1797 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1798 */
1799 int rate;
1800 if (rx_status->flag & RX_FLAG_HT) {
1801 rate = 65; /* TODO: HT rates */
1802 } else {
1803 rate = local->hw.wiphy->bands[band]->
1804 bitrates[rx_status->rate_idx].bitrate;
1805 }
1806 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1807 } else if (local && local->ops && local->ops->get_tsf)
1808 /* second best option: get current TSF */
1809 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1810 else
1811 /* can't merge without knowing the TSF */
1812 rx_timestamp = -1LLU;
1813 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1814 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1815 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1816 mgmt->sa, mgmt->bssid,
1817 (unsigned long long)rx_timestamp,
1818 (unsigned long long)beacon_timestamp,
1819 (unsigned long long)(rx_timestamp - beacon_timestamp),
1820 jiffies);
1821 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1822 if (beacon_timestamp > rx_timestamp) {
1823 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1824 printk(KERN_DEBUG "%s: beacon TSF higher than "
1825 "local TSF - IBSS merge with BSSID %pM\n",
1826 sdata->dev->name, mgmt->bssid);
1827 #endif
1828 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1829 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1830 }
1831 }
1832
1833 ieee80211_rx_bss_put(local, bss);
1834 }
1835
1836
1837 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1838 struct ieee80211_mgmt *mgmt,
1839 size_t len,
1840 struct ieee80211_rx_status *rx_status)
1841 {
1842 size_t baselen;
1843 struct ieee802_11_elems elems;
1844 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1845
1846 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1847 return; /* ignore ProbeResp to foreign address */
1848
1849 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1850 if (baselen > len)
1851 return;
1852
1853 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1854 &elems);
1855
1856 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1857
1858 /* direct probe may be part of the association flow */
1859 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1860 &ifsta->request)) {
1861 printk(KERN_DEBUG "%s direct probe responded\n",
1862 sdata->dev->name);
1863 ieee80211_authenticate(sdata, ifsta);
1864 }
1865 }
1866
1867
1868 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1869 struct ieee80211_mgmt *mgmt,
1870 size_t len,
1871 struct ieee80211_rx_status *rx_status)
1872 {
1873 struct ieee80211_if_sta *ifsta;
1874 size_t baselen;
1875 struct ieee802_11_elems elems;
1876 struct ieee80211_local *local = sdata->local;
1877 u32 changed = 0;
1878 bool erp_valid, directed_tim;
1879 u8 erp_value = 0;
1880
1881 /* Process beacon from the current BSS */
1882 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1883 if (baselen > len)
1884 return;
1885
1886 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1887
1888 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1889
1890 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1891 return;
1892 ifsta = &sdata->u.sta;
1893
1894 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1895 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1896 return;
1897
1898 if (rx_status->freq != local->hw.conf.channel->center_freq)
1899 return;
1900
1901 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1902 elems.wmm_param_len);
1903
1904 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1905 local->hw.conf.flags & IEEE80211_CONF_PS) {
1906 directed_tim = ieee80211_check_tim(&elems, ifsta->aid);
1907
1908 if (directed_tim) {
1909 if (local->hw.conf.dynamic_ps_timeout > 0) {
1910 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1911 ieee80211_hw_config(local,
1912 IEEE80211_CONF_CHANGE_PS);
1913 ieee80211_send_nullfunc(local, sdata, 0);
1914 } else {
1915 local->pspolling = true;
1916
1917 /*
1918 * Here is assumed that the driver will be
1919 * able to send ps-poll frame and receive a
1920 * response even though power save mode is
1921 * enabled, but some drivers might require
1922 * to disable power save here. This needs
1923 * to be investigated.
1924 */
1925 ieee80211_send_pspoll(local, sdata);
1926 }
1927 }
1928 }
1929
1930 if (elems.erp_info && elems.erp_info_len >= 1) {
1931 erp_valid = true;
1932 erp_value = elems.erp_info[0];
1933 } else {
1934 erp_valid = false;
1935 }
1936 changed |= ieee80211_handle_bss_capability(sdata,
1937 le16_to_cpu(mgmt->u.beacon.capab_info),
1938 erp_valid, erp_value);
1939
1940
1941 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1942 struct sta_info *sta;
1943 struct ieee80211_supported_band *sband;
1944 u16 ap_ht_cap_flags;
1945
1946 rcu_read_lock();
1947
1948 sta = sta_info_get(local, ifsta->bssid);
1949 if (!sta) {
1950 rcu_read_unlock();
1951 return;
1952 }
1953
1954 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1955
1956 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1957 elems.ht_cap_elem, &sta->sta.ht_cap);
1958
1959 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1960
1961 rcu_read_unlock();
1962
1963 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1964 ap_ht_cap_flags);
1965 }
1966
1967 if (elems.country_elem) {
1968 /* Note we are only reviewing this on beacons
1969 * for the BSSID we are associated to */
1970 regulatory_hint_11d(local->hw.wiphy,
1971 elems.country_elem, elems.country_elem_len);
1972
1973 /* TODO: IBSS also needs this */
1974 if (elems.pwr_constr_elem)
1975 ieee80211_handle_pwr_constr(sdata,
1976 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1977 elems.pwr_constr_elem,
1978 elems.pwr_constr_elem_len);
1979 }
1980
1981 ieee80211_bss_info_change_notify(sdata, changed);
1982 }
1983
1984
1985 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1986 struct ieee80211_if_sta *ifsta,
1987 struct ieee80211_mgmt *mgmt,
1988 size_t len)
1989 {
1990 struct ieee80211_local *local = sdata->local;
1991 int tx_last_beacon;
1992 struct sk_buff *skb;
1993 struct ieee80211_mgmt *resp;
1994 u8 *pos, *end;
1995
1996 if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1997 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1998 len < 24 + 2 || !ifsta->probe_resp)
1999 return;
2000
2001 if (local->ops->tx_last_beacon)
2002 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2003 else
2004 tx_last_beacon = 1;
2005
2006 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2007 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
2008 " (tx_last_beacon=%d)\n",
2009 sdata->dev->name, mgmt->sa, mgmt->da,
2010 mgmt->bssid, tx_last_beacon);
2011 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2012
2013 if (!tx_last_beacon)
2014 return;
2015
2016 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2017 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2018 return;
2019
2020 end = ((u8 *) mgmt) + len;
2021 pos = mgmt->u.probe_req.variable;
2022 if (pos[0] != WLAN_EID_SSID ||
2023 pos + 2 + pos[1] > end) {
2024 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2025 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2026 "from %pM\n",
2027 sdata->dev->name, mgmt->sa);
2028 #endif
2029 return;
2030 }
2031 if (pos[1] != 0 &&
2032 (pos[1] != ifsta->ssid_len ||
2033 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
2034 /* Ignore ProbeReq for foreign SSID */
2035 return;
2036 }
2037
2038 /* Reply with ProbeResp */
2039 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
2040 if (!skb)
2041 return;
2042
2043 resp = (struct ieee80211_mgmt *) skb->data;
2044 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2045 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2046 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
2047 sdata->dev->name, resp->da);
2048 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2049 ieee80211_tx_skb(sdata, skb, 0);
2050 }
2051
2052 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
2053 struct ieee80211_rx_status *rx_status)
2054 {
2055 struct ieee80211_local *local = sdata->local;
2056 struct ieee80211_if_sta *ifsta;
2057 struct ieee80211_mgmt *mgmt;
2058 u16 fc;
2059
2060 if (skb->len < 24)
2061 goto fail;
2062
2063 ifsta = &sdata->u.sta;
2064
2065 mgmt = (struct ieee80211_mgmt *) skb->data;
2066 fc = le16_to_cpu(mgmt->frame_control);
2067
2068 switch (fc & IEEE80211_FCTL_STYPE) {
2069 case IEEE80211_STYPE_PROBE_REQ:
2070 case IEEE80211_STYPE_PROBE_RESP:
2071 case IEEE80211_STYPE_BEACON:
2072 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2073 case IEEE80211_STYPE_AUTH:
2074 case IEEE80211_STYPE_ASSOC_RESP:
2075 case IEEE80211_STYPE_REASSOC_RESP:
2076 case IEEE80211_STYPE_DEAUTH:
2077 case IEEE80211_STYPE_DISASSOC:
2078 skb_queue_tail(&ifsta->skb_queue, skb);
2079 queue_work(local->hw.workqueue, &ifsta->work);
2080 return;
2081 }
2082
2083 fail:
2084 kfree_skb(skb);
2085 }
2086
2087 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2088 struct sk_buff *skb)
2089 {
2090 struct ieee80211_rx_status *rx_status;
2091 struct ieee80211_if_sta *ifsta;
2092 struct ieee80211_mgmt *mgmt;
2093 u16 fc;
2094
2095 ifsta = &sdata->u.sta;
2096
2097 rx_status = (struct ieee80211_rx_status *) skb->cb;
2098 mgmt = (struct ieee80211_mgmt *) skb->data;
2099 fc = le16_to_cpu(mgmt->frame_control);
2100
2101 switch (fc & IEEE80211_FCTL_STYPE) {
2102 case IEEE80211_STYPE_PROBE_REQ:
2103 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
2104 break;
2105 case IEEE80211_STYPE_PROBE_RESP:
2106 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
2107 break;
2108 case IEEE80211_STYPE_BEACON:
2109 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2110 break;
2111 case IEEE80211_STYPE_AUTH:
2112 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2113 break;
2114 case IEEE80211_STYPE_ASSOC_RESP:
2115 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2116 break;
2117 case IEEE80211_STYPE_REASSOC_RESP:
2118 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2119 break;
2120 case IEEE80211_STYPE_DEAUTH:
2121 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2122 break;
2123 case IEEE80211_STYPE_DISASSOC:
2124 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2125 break;
2126 }
2127
2128 kfree_skb(skb);
2129 }
2130
2131
2132 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
2133 {
2134 struct ieee80211_local *local = sdata->local;
2135 int active = 0;
2136 struct sta_info *sta;
2137
2138 rcu_read_lock();
2139
2140 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2141 if (sta->sdata == sdata &&
2142 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2143 jiffies)) {
2144 active++;
2145 break;
2146 }
2147 }
2148
2149 rcu_read_unlock();
2150
2151 return active;
2152 }
2153
2154
2155 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2156 struct ieee80211_if_sta *ifsta)
2157 {
2158 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2159
2160 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2161 if (ieee80211_sta_active_ibss(sdata))
2162 return;
2163
2164 if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2165 (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2166 return;
2167
2168 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2169 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2170
2171 /* XXX maybe racy? */
2172 if (sdata->local->scan_req)
2173 return;
2174
2175 memcpy(sdata->local->int_scan_req.ssids[0].ssid,
2176 ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2177 sdata->local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2178 ieee80211_request_scan(sdata, &sdata->local->int_scan_req);
2179 }
2180
2181
2182 static void ieee80211_sta_timer(unsigned long data)
2183 {
2184 struct ieee80211_sub_if_data *sdata =
2185 (struct ieee80211_sub_if_data *) data;
2186 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2187 struct ieee80211_local *local = sdata->local;
2188
2189 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2190 queue_work(local->hw.workqueue, &ifsta->work);
2191 }
2192
2193 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2194 struct ieee80211_if_sta *ifsta)
2195 {
2196 struct ieee80211_local *local = sdata->local;
2197
2198 if (local->ops->reset_tsf) {
2199 /* Reset own TSF to allow time synchronization work. */
2200 local->ops->reset_tsf(local_to_hw(local));
2201 }
2202
2203 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2204
2205
2206 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2207 ifsta->auth_alg = WLAN_AUTH_OPEN;
2208 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2209 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2210 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2211 ifsta->auth_alg = WLAN_AUTH_LEAP;
2212 else
2213 ifsta->auth_alg = WLAN_AUTH_OPEN;
2214 ifsta->auth_transaction = -1;
2215 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2216 ifsta->assoc_scan_tries = 0;
2217 ifsta->direct_probe_tries = 0;
2218 ifsta->auth_tries = 0;
2219 ifsta->assoc_tries = 0;
2220 netif_tx_stop_all_queues(sdata->dev);
2221 netif_carrier_off(sdata->dev);
2222 }
2223
2224 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2225 struct ieee80211_if_sta *ifsta)
2226 {
2227 struct ieee80211_local *local = sdata->local;
2228 struct ieee80211_supported_band *sband;
2229 u8 *pos;
2230 u8 bssid[ETH_ALEN];
2231 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
2232 u16 capability;
2233 int i;
2234
2235 if (sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) {
2236 memcpy(bssid, ifsta->bssid, ETH_ALEN);
2237 } else {
2238 /* Generate random, not broadcast, locally administered BSSID. Mix in
2239 * own MAC address to make sure that devices that do not have proper
2240 * random number generator get different BSSID. */
2241 get_random_bytes(bssid, ETH_ALEN);
2242 for (i = 0; i < ETH_ALEN; i++)
2243 bssid[i] ^= sdata->dev->dev_addr[i];
2244 bssid[0] &= ~0x01;
2245 bssid[0] |= 0x02;
2246 }
2247
2248 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2249 sdata->dev->name, bssid);
2250
2251 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2252
2253 if (local->hw.conf.beacon_int == 0)
2254 local->hw.conf.beacon_int = 100;
2255
2256 capability = WLAN_CAPABILITY_IBSS;
2257
2258 if (sdata->default_key)
2259 capability |= WLAN_CAPABILITY_PRIVACY;
2260 else
2261 sdata->drop_unencrypted = 0;
2262
2263 pos = supp_rates;
2264 for (i = 0; i < sband->n_bitrates; i++) {
2265 int rate = sband->bitrates[i].bitrate;
2266 *pos++ = (u8) (rate / 5);
2267 }
2268
2269 return __ieee80211_sta_join_ibss(sdata, ifsta,
2270 bssid, local->hw.conf.beacon_int,
2271 local->hw.conf.channel->center_freq,
2272 sband->n_bitrates, supp_rates,
2273 capability);
2274 }
2275
2276
2277 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2278 struct ieee80211_if_sta *ifsta)
2279 {
2280 struct ieee80211_local *local = sdata->local;
2281 struct ieee80211_bss *bss;
2282 int active_ibss;
2283
2284 if (ifsta->ssid_len == 0)
2285 return -EINVAL;
2286
2287 active_ibss = ieee80211_sta_active_ibss(sdata);
2288 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2289 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2290 sdata->dev->name, active_ibss);
2291 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2292
2293 if (active_ibss)
2294 return 0;
2295
2296 if (ifsta->flags & IEEE80211_STA_BSSID_SET)
2297 bss = ieee80211_rx_bss_get(local, ifsta->bssid, 0,
2298 ifsta->ssid, ifsta->ssid_len);
2299 else
2300 bss = (void *)cfg80211_get_ibss(local->hw.wiphy,
2301 NULL,
2302 ifsta->ssid, ifsta->ssid_len);
2303
2304 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2305 if (bss)
2306 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
2307 "%pM\n", bss->cbss.bssid, ifsta->bssid);
2308 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2309
2310 if (bss &&
2311 (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) ||
2312 memcmp(ifsta->bssid, bss->cbss.bssid, ETH_ALEN))) {
2313 int ret;
2314
2315 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2316 " based on configured SSID\n",
2317 sdata->dev->name, bss->cbss.bssid);
2318
2319 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2320 ieee80211_rx_bss_put(local, bss);
2321 return ret;
2322 } else if (bss)
2323 ieee80211_rx_bss_put(local, bss);
2324
2325 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2326 printk(KERN_DEBUG " did not try to join ibss\n");
2327 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2328
2329 /* Selected IBSS not found in current scan results - try to scan */
2330 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2331 !ieee80211_sta_active_ibss(sdata)) {
2332 mod_timer(&ifsta->timer, jiffies +
2333 IEEE80211_IBSS_MERGE_INTERVAL);
2334 } else if (time_after(jiffies, local->last_scan_completed +
2335 IEEE80211_SCAN_INTERVAL)) {
2336 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2337 "join\n", sdata->dev->name);
2338
2339 /* XXX maybe racy? */
2340 if (local->scan_req)
2341 return -EBUSY;
2342
2343 memcpy(local->int_scan_req.ssids[0].ssid,
2344 ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2345 local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2346 return ieee80211_request_scan(sdata, &local->int_scan_req);
2347 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2348 int interval = IEEE80211_SCAN_INTERVAL;
2349
2350 if (time_after(jiffies, ifsta->ibss_join_req +
2351 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2352 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2353 (!(local->oper_channel->flags &
2354 IEEE80211_CHAN_NO_IBSS)))
2355 return ieee80211_sta_create_ibss(sdata, ifsta);
2356 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2357 printk(KERN_DEBUG "%s: IBSS not allowed on"
2358 " %d MHz\n", sdata->dev->name,
2359 local->hw.conf.channel->center_freq);
2360 }
2361
2362 /* No IBSS found - decrease scan interval and continue
2363 * scanning. */
2364 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2365 }
2366
2367 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2368 mod_timer(&ifsta->timer, jiffies + interval);
2369 return 0;
2370 }
2371
2372 return 0;
2373 }
2374
2375
2376 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2377 struct ieee80211_if_sta *ifsta)
2378 {
2379 struct ieee80211_local *local = sdata->local;
2380 struct ieee80211_bss *bss;
2381 u8 *bssid = ifsta->bssid, *ssid = ifsta->ssid;
2382 u8 ssid_len = ifsta->ssid_len;
2383 u16 capa_mask = WLAN_CAPABILITY_ESS;
2384 u16 capa_val = WLAN_CAPABILITY_ESS;
2385 struct ieee80211_channel *chan = local->oper_channel;
2386
2387 if (ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2388 IEEE80211_STA_AUTO_BSSID_SEL |
2389 IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2390 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2391 if (sdata->default_key)
2392 capa_val |= WLAN_CAPABILITY_PRIVACY;
2393 }
2394
2395 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2396 chan = NULL;
2397
2398 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2399 bssid = NULL;
2400
2401 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2402 ssid = NULL;
2403 ssid_len = 0;
2404 }
2405
2406 bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2407 bssid, ssid, ssid_len,
2408 capa_mask, capa_val);
2409
2410 if (bss) {
2411 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
2412 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2413 ieee80211_sta_set_ssid(sdata, bss->ssid,
2414 bss->ssid_len);
2415 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2416 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2417 bss->supp_rates);
2418 if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
2419 sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
2420 else
2421 sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
2422
2423 /* Send out direct probe if no probe resp was received or
2424 * the one we have is outdated
2425 */
2426 if (!bss->last_probe_resp ||
2427 time_after(jiffies, bss->last_probe_resp
2428 + IEEE80211_SCAN_RESULT_EXPIRE))
2429 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2430 else
2431 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2432
2433 ieee80211_rx_bss_put(local, bss);
2434 ieee80211_sta_reset_auth(sdata, ifsta);
2435 return 0;
2436 } else {
2437 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2438 ifsta->assoc_scan_tries++;
2439 /* XXX maybe racy? */
2440 if (local->scan_req)
2441 return -1;
2442 memcpy(local->int_scan_req.ssids[0].ssid,
2443 ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2444 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2445 local->int_scan_req.ssids[0].ssid_len = 0;
2446 else
2447 local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2448 ieee80211_start_scan(sdata, &local->int_scan_req);
2449 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2450 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2451 } else {
2452 ifsta->assoc_scan_tries = 0;
2453 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2454 }
2455 }
2456 return -1;
2457 }
2458
2459
2460 static void ieee80211_sta_work(struct work_struct *work)
2461 {
2462 struct ieee80211_sub_if_data *sdata =
2463 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2464 struct ieee80211_local *local = sdata->local;
2465 struct ieee80211_if_sta *ifsta;
2466 struct sk_buff *skb;
2467
2468 if (!netif_running(sdata->dev))
2469 return;
2470
2471 if (local->sw_scanning || local->hw_scanning)
2472 return;
2473
2474 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2475 sdata->vif.type != NL80211_IFTYPE_ADHOC))
2476 return;
2477 ifsta = &sdata->u.sta;
2478
2479 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2480 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2481
2482 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2483 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2484 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2485 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2486 ieee80211_start_scan(sdata, local->scan_req);
2487 return;
2488 }
2489
2490 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2491 if (ieee80211_sta_config_auth(sdata, ifsta))
2492 return;
2493 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2494 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2495 return;
2496
2497 switch (ifsta->state) {
2498 case IEEE80211_STA_MLME_DISABLED:
2499 break;
2500 case IEEE80211_STA_MLME_DIRECT_PROBE:
2501 ieee80211_direct_probe(sdata, ifsta);
2502 break;
2503 case IEEE80211_STA_MLME_AUTHENTICATE:
2504 ieee80211_authenticate(sdata, ifsta);
2505 break;
2506 case IEEE80211_STA_MLME_ASSOCIATE:
2507 ieee80211_associate(sdata, ifsta);
2508 break;
2509 case IEEE80211_STA_MLME_ASSOCIATED:
2510 ieee80211_associated(sdata, ifsta);
2511 break;
2512 case IEEE80211_STA_MLME_IBSS_SEARCH:
2513 ieee80211_sta_find_ibss(sdata, ifsta);
2514 break;
2515 case IEEE80211_STA_MLME_IBSS_JOINED:
2516 ieee80211_sta_merge_ibss(sdata, ifsta);
2517 break;
2518 default:
2519 WARN_ON(1);
2520 break;
2521 }
2522
2523 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2524 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2525 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2526
2527 ieee80211_set_disassoc(sdata, ifsta, false, true,
2528 WLAN_REASON_UNSPECIFIED);
2529 }
2530 }
2531
2532 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2533 {
2534 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2535 queue_work(sdata->local->hw.workqueue,
2536 &sdata->u.sta.work);
2537 }
2538
2539 /* interface setup */
2540 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2541 {
2542 struct ieee80211_if_sta *ifsta;
2543
2544 ifsta = &sdata->u.sta;
2545 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2546 INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2547 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2548 (unsigned long) sdata);
2549 setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2550 (unsigned long) sdata);
2551 skb_queue_head_init(&ifsta->skb_queue);
2552
2553 ifsta->capab = WLAN_CAPABILITY_ESS;
2554 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2555 IEEE80211_AUTH_ALG_SHARED_KEY;
2556 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2557 IEEE80211_STA_AUTO_BSSID_SEL |
2558 IEEE80211_STA_AUTO_CHANNEL_SEL;
2559 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2560 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2561 }
2562
2563 /*
2564 * Add a new IBSS station, will also be called by the RX code when,
2565 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2566 * must be callable in atomic context.
2567 */
2568 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2569 u8 *bssid,u8 *addr, u32 supp_rates)
2570 {
2571 struct ieee80211_local *local = sdata->local;
2572 struct sta_info *sta;
2573 int band = local->hw.conf.channel->band;
2574
2575 /* TODO: Could consider removing the least recently used entry and
2576 * allow new one to be added. */
2577 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2578 if (net_ratelimit()) {
2579 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2580 "entry %pM\n", sdata->dev->name, addr);
2581 }
2582 return NULL;
2583 }
2584
2585 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2586 return NULL;
2587
2588 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2589 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2590 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2591 #endif
2592
2593 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2594 if (!sta)
2595 return NULL;
2596
2597 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2598
2599 /* make sure mandatory rates are always added */
2600 sta->sta.supp_rates[band] = supp_rates |
2601 ieee80211_mandatory_rates(local, band);
2602
2603 rate_control_rate_init(sta);
2604
2605 if (sta_info_insert(sta))
2606 return NULL;
2607
2608 return sta;
2609 }
2610
2611 /* configuration hooks */
2612 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2613 struct ieee80211_if_sta *ifsta)
2614 {
2615 struct ieee80211_local *local = sdata->local;
2616
2617 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2618 return;
2619
2620 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2621 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2622 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2623 IEEE80211_STA_AUTO_SSID_SEL))) {
2624
2625 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2626 ieee80211_set_disassoc(sdata, ifsta, true, true,
2627 WLAN_REASON_DEAUTH_LEAVING);
2628
2629 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2630 queue_work(local->hw.workqueue, &ifsta->work);
2631 }
2632 }
2633
2634 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2635 {
2636 struct ieee80211_if_sta *ifsta;
2637
2638 if (len > IEEE80211_MAX_SSID_LEN)
2639 return -EINVAL;
2640
2641 ifsta = &sdata->u.sta;
2642
2643 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2644 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2645 memcpy(ifsta->ssid, ssid, len);
2646 ifsta->ssid_len = len;
2647 }
2648
2649 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2650
2651 if (len)
2652 ifsta->flags |= IEEE80211_STA_SSID_SET;
2653 else
2654 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2655
2656 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2657 ifsta->ibss_join_req = jiffies;
2658 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2659 return ieee80211_sta_find_ibss(sdata, ifsta);
2660 }
2661
2662 return 0;
2663 }
2664
2665 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2666 {
2667 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2668 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2669 *len = ifsta->ssid_len;
2670 return 0;
2671 }
2672
2673 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2674 {
2675 struct ieee80211_if_sta *ifsta;
2676
2677 ifsta = &sdata->u.sta;
2678
2679 if (is_valid_ether_addr(bssid)) {
2680 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2681 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2682 } else {
2683 memset(ifsta->bssid, 0, ETH_ALEN);
2684 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2685 }
2686
2687 if (netif_running(sdata->dev)) {
2688 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2689 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2690 "the low-level driver\n", sdata->dev->name);
2691 }
2692 }
2693
2694 return ieee80211_sta_set_ssid(sdata, ifsta->ssid, ifsta->ssid_len);
2695 }
2696
2697 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2698 {
2699 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2700
2701 kfree(ifsta->extra_ie);
2702 if (len == 0) {
2703 ifsta->extra_ie = NULL;
2704 ifsta->extra_ie_len = 0;
2705 return 0;
2706 }
2707 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2708 if (!ifsta->extra_ie) {
2709 ifsta->extra_ie_len = 0;
2710 return -ENOMEM;
2711 }
2712 memcpy(ifsta->extra_ie, ie, len);
2713 ifsta->extra_ie_len = len;
2714 return 0;
2715 }
2716
2717 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2718 {
2719 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2720
2721 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2722 sdata->dev->name, reason);
2723
2724 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2725 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2726 return -EINVAL;
2727
2728 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2729 return 0;
2730 }
2731
2732 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2733 {
2734 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2735
2736 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2737 sdata->dev->name, reason);
2738
2739 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2740 return -EINVAL;
2741
2742 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2743 return -1;
2744
2745 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2746 return 0;
2747 }
2748
2749 /* scan finished notification */
2750 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2751 {
2752 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2753 struct ieee80211_if_sta *ifsta;
2754
2755 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2756 ifsta = &sdata->u.sta;
2757 if ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2758 !ieee80211_sta_active_ibss(sdata))
2759 ieee80211_sta_find_ibss(sdata, ifsta);
2760 }
2761
2762 /* Restart STA timers */
2763 rcu_read_lock();
2764 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2765 ieee80211_restart_sta_timer(sdata);
2766 rcu_read_unlock();
2767 }
2768
2769 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2770 {
2771 struct ieee80211_local *local =
2772 container_of(work, struct ieee80211_local,
2773 dynamic_ps_disable_work);
2774
2775 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2776 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2777 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2778 }
2779
2780 ieee80211_wake_queues_by_reason(&local->hw,
2781 IEEE80211_QUEUE_STOP_REASON_PS);
2782 }
2783
2784 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2785 {
2786 struct ieee80211_local *local =
2787 container_of(work, struct ieee80211_local,
2788 dynamic_ps_enable_work);
2789 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2790
2791 if (local->hw.conf.flags & IEEE80211_CONF_PS)
2792 return;
2793
2794 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2795 ieee80211_send_nullfunc(local, sdata, 1);
2796
2797 local->hw.conf.flags |= IEEE80211_CONF_PS;
2798 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2799 }
2800
2801 void ieee80211_dynamic_ps_timer(unsigned long data)
2802 {
2803 struct ieee80211_local *local = (void *) data;
2804
2805 queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2806 }
Linux kernel - Deliverables
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