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mac80211: use cfg80211s BSS infrastructure
[linux-2.6/btrfs-unstable.git] / net / mac80211 / mlme.c
blobc51860f667312878afac1e931b469a01a1f05701
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 }
1209
1210 if (auth_alg != ifsta->auth_alg ||
1211 auth_transaction != ifsta->auth_transaction)
1212 return;
1213
1214 if (status_code != WLAN_STATUS_SUCCESS) {
1215 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1216 u8 algs[3];
1217 const int num_algs = ARRAY_SIZE(algs);
1218 int i, pos;
1219 algs[0] = algs[1] = algs[2] = 0xff;
1220 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1221 algs[0] = WLAN_AUTH_OPEN;
1222 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1223 algs[1] = WLAN_AUTH_SHARED_KEY;
1224 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1225 algs[2] = WLAN_AUTH_LEAP;
1226 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1227 pos = 0;
1228 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1229 pos = 1;
1230 else
1231 pos = 2;
1232 for (i = 0; i < num_algs; i++) {
1233 pos++;
1234 if (pos >= num_algs)
1235 pos = 0;
1236 if (algs[pos] == ifsta->auth_alg ||
1237 algs[pos] == 0xff)
1238 continue;
1239 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1240 !ieee80211_sta_wep_configured(sdata))
1241 continue;
1242 ifsta->auth_alg = algs[pos];
1243 break;
1244 }
1245 }
1246 return;
1247 }
1248
1249 switch (ifsta->auth_alg) {
1250 case WLAN_AUTH_OPEN:
1251 case WLAN_AUTH_LEAP:
1252 ieee80211_auth_completed(sdata, ifsta);
1253 break;
1254 case WLAN_AUTH_SHARED_KEY:
1255 if (ifsta->auth_transaction == 4)
1256 ieee80211_auth_completed(sdata, ifsta);
1257 else
1258 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1259 break;
1260 }
1261 }
1262
1263
1264 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1265 struct ieee80211_if_sta *ifsta,
1266 struct ieee80211_mgmt *mgmt,
1267 size_t len)
1268 {
1269 u16 reason_code;
1270
1271 if (len < 24 + 2)
1272 return;
1273
1274 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1275 return;
1276
1277 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1278
1279 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1280 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1281 sdata->dev->name, reason_code);
1282
1283 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1284 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1285 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1286 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1287 mod_timer(&ifsta->timer, jiffies +
1288 IEEE80211_RETRY_AUTH_INTERVAL);
1289 }
1290
1291 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1292 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1293 }
1294
1295
1296 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1297 struct ieee80211_if_sta *ifsta,
1298 struct ieee80211_mgmt *mgmt,
1299 size_t len)
1300 {
1301 u16 reason_code;
1302
1303 if (len < 24 + 2)
1304 return;
1305
1306 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1307 return;
1308
1309 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1310
1311 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1312 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1313 sdata->dev->name, reason_code);
1314
1315 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1316 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1317 mod_timer(&ifsta->timer, jiffies +
1318 IEEE80211_RETRY_AUTH_INTERVAL);
1319 }
1320
1321 ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1322 }
1323
1324
1325 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1326 struct ieee80211_if_sta *ifsta,
1327 struct ieee80211_mgmt *mgmt,
1328 size_t len,
1329 int reassoc)
1330 {
1331 struct ieee80211_local *local = sdata->local;
1332 struct ieee80211_supported_band *sband;
1333 struct sta_info *sta;
1334 u32 rates, basic_rates;
1335 u16 capab_info, status_code, aid;
1336 struct ieee802_11_elems elems;
1337 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1338 u8 *pos;
1339 u32 changed = 0;
1340 int i, j;
1341 bool have_higher_than_11mbit = false, newsta = false;
1342 u16 ap_ht_cap_flags;
1343
1344 /* AssocResp and ReassocResp have identical structure, so process both
1345 * of them in this function. */
1346
1347 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1348 return;
1349
1350 if (len < 24 + 6)
1351 return;
1352
1353 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1354 return;
1355
1356 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1357 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1358 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1359
1360 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1361 "status=%d aid=%d)\n",
1362 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1363 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1364
1365 pos = mgmt->u.assoc_resp.variable;
1366 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1367
1368 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1369 elems.timeout_int && elems.timeout_int_len == 5 &&
1370 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1371 u32 tu, ms;
1372 tu = get_unaligned_le32(elems.timeout_int + 1);
1373 ms = tu * 1024 / 1000;
1374 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1375 "comeback duration %u TU (%u ms)\n",
1376 sdata->dev->name, tu, ms);
1377 if (ms > IEEE80211_ASSOC_TIMEOUT)
1378 mod_timer(&ifsta->timer,
1379 jiffies + msecs_to_jiffies(ms));
1380 return;
1381 }
1382
1383 if (status_code != WLAN_STATUS_SUCCESS) {
1384 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1385 sdata->dev->name, status_code);
1386 /* if this was a reassociation, ensure we try a "full"
1387 * association next time. This works around some broken APs
1388 * which do not correctly reject reassociation requests. */
1389 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1390 return;
1391 }
1392
1393 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1394 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1395 "set\n", sdata->dev->name, aid);
1396 aid &= ~(BIT(15) | BIT(14));
1397
1398 if (!elems.supp_rates) {
1399 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1400 sdata->dev->name);
1401 return;
1402 }
1403
1404 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1405 ifsta->aid = aid;
1406 ifsta->ap_capab = capab_info;
1407
1408 kfree(ifsta->assocresp_ies);
1409 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1410 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1411 if (ifsta->assocresp_ies)
1412 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1413
1414 rcu_read_lock();
1415
1416 /* Add STA entry for the AP */
1417 sta = sta_info_get(local, ifsta->bssid);
1418 if (!sta) {
1419 newsta = true;
1420
1421 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1422 if (!sta) {
1423 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1424 " the AP\n", sdata->dev->name);
1425 rcu_read_unlock();
1426 return;
1427 }
1428
1429 /* update new sta with its last rx activity */
1430 sta->last_rx = jiffies;
1431 }
1432
1433 /*
1434 * FIXME: Do we really need to update the sta_info's information here?
1435 * We already know about the AP (we found it in our list) so it
1436 * should already be filled with the right info, no?
1437 * As is stands, all this is racy because typically we assume
1438 * the information that is filled in here (except flags) doesn't
1439 * change while a STA structure is alive. As such, it should move
1440 * to between the sta_info_alloc() and sta_info_insert() above.
1441 */
1442
1443 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1444 WLAN_STA_AUTHORIZED);
1445
1446 rates = 0;
1447 basic_rates = 0;
1448 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1449
1450 for (i = 0; i < elems.supp_rates_len; i++) {
1451 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1452 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1453
1454 if (rate > 110)
1455 have_higher_than_11mbit = true;
1456
1457 for (j = 0; j < sband->n_bitrates; j++) {
1458 if (sband->bitrates[j].bitrate == rate) {
1459 rates |= BIT(j);
1460 if (is_basic)
1461 basic_rates |= BIT(j);
1462 break;
1463 }
1464 }
1465 }
1466
1467 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1468 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1469 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1470
1471 if (rate > 110)
1472 have_higher_than_11mbit = true;
1473
1474 for (j = 0; j < sband->n_bitrates; j++) {
1475 if (sband->bitrates[j].bitrate == rate) {
1476 rates |= BIT(j);
1477 if (is_basic)
1478 basic_rates |= BIT(j);
1479 break;
1480 }
1481 }
1482 }
1483
1484 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1485 sdata->vif.bss_conf.basic_rates = basic_rates;
1486
1487 /* cf. IEEE 802.11 9.2.12 */
1488 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1489 have_higher_than_11mbit)
1490 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1491 else
1492 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1493
1494 if (elems.ht_cap_elem)
1495 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1496 elems.ht_cap_elem, &sta->sta.ht_cap);
1497
1498 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1499
1500 rate_control_rate_init(sta);
1501
1502 if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
1503 set_sta_flags(sta, WLAN_STA_MFP);
1504
1505 if (elems.wmm_param)
1506 set_sta_flags(sta, WLAN_STA_WME);
1507
1508 if (newsta) {
1509 int err = sta_info_insert(sta);
1510 if (err) {
1511 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1512 " the AP (error %d)\n", sdata->dev->name, err);
1513 rcu_read_unlock();
1514 return;
1515 }
1516 }
1517
1518 rcu_read_unlock();
1519
1520 if (elems.wmm_param)
1521 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1522 elems.wmm_param_len);
1523
1524 if (elems.ht_info_elem && elems.wmm_param &&
1525 (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1526 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1527 ap_ht_cap_flags);
1528
1529 /* set AID and assoc capability,
1530 * ieee80211_set_associated() will tell the driver */
1531 bss_conf->aid = aid;
1532 bss_conf->assoc_capability = capab_info;
1533 ieee80211_set_associated(sdata, ifsta, changed);
1534
1535 ieee80211_associated(sdata, ifsta);
1536 }
1537
1538
1539 static int __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1540 struct ieee80211_if_sta *ifsta,
1541 const u8 *bssid, const int beacon_int,
1542 const int freq,
1543 const size_t supp_rates_len,
1544 const u8 *supp_rates,
1545 const u16 capability)
1546 {
1547 struct ieee80211_local *local = sdata->local;
1548 int res = 0, rates, i, j;
1549 struct sk_buff *skb;
1550 struct ieee80211_mgmt *mgmt;
1551 u8 *pos;
1552 struct ieee80211_supported_band *sband;
1553 union iwreq_data wrqu;
1554
1555 if (local->ops->reset_tsf) {
1556 /* Reset own TSF to allow time synchronization work. */
1557 local->ops->reset_tsf(local_to_hw(local));
1558 }
1559
1560 if ((ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) &&
1561 memcmp(ifsta->bssid, bssid, ETH_ALEN) == 0)
1562 return res;
1563
1564 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
1565 sdata->u.sta.ie_proberesp_len);
1566 if (!skb) {
1567 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1568 "response\n", sdata->dev->name);
1569 return -ENOMEM;
1570 }
1571
1572 if (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) {
1573 /* Remove possible STA entries from other IBSS networks. */
1574 sta_info_flush_delayed(sdata);
1575 }
1576
1577 memcpy(ifsta->bssid, bssid, ETH_ALEN);
1578 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1579 if (res)
1580 return res;
1581
1582 local->hw.conf.beacon_int = beacon_int >= 10 ? beacon_int : 10;
1583
1584 sdata->drop_unencrypted = capability &
1585 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1586
1587 res = ieee80211_set_freq(sdata, freq);
1588
1589 if (res)
1590 return res;
1591
1592 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1593
1594 /* Build IBSS probe response */
1595
1596 skb_reserve(skb, local->hw.extra_tx_headroom);
1597
1598 mgmt = (struct ieee80211_mgmt *)
1599 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1600 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1601 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1602 IEEE80211_STYPE_PROBE_RESP);
1603 memset(mgmt->da, 0xff, ETH_ALEN);
1604 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1605 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1606 mgmt->u.beacon.beacon_int =
1607 cpu_to_le16(local->hw.conf.beacon_int);
1608 mgmt->u.beacon.capab_info = cpu_to_le16(capability);
1609
1610 pos = skb_put(skb, 2 + ifsta->ssid_len);
1611 *pos++ = WLAN_EID_SSID;
1612 *pos++ = ifsta->ssid_len;
1613 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1614
1615 rates = supp_rates_len;
1616 if (rates > 8)
1617 rates = 8;
1618 pos = skb_put(skb, 2 + rates);
1619 *pos++ = WLAN_EID_SUPP_RATES;
1620 *pos++ = rates;
1621 memcpy(pos, supp_rates, rates);
1622
1623 if (sband->band == IEEE80211_BAND_2GHZ) {
1624 pos = skb_put(skb, 2 + 1);
1625 *pos++ = WLAN_EID_DS_PARAMS;
1626 *pos++ = 1;
1627 *pos++ = ieee80211_frequency_to_channel(freq);
1628 }
1629
1630 pos = skb_put(skb, 2 + 2);
1631 *pos++ = WLAN_EID_IBSS_PARAMS;
1632 *pos++ = 2;
1633 /* FIX: set ATIM window based on scan results */
1634 *pos++ = 0;
1635 *pos++ = 0;
1636
1637 if (supp_rates_len > 8) {
1638 rates = supp_rates_len - 8;
1639 pos = skb_put(skb, 2 + rates);
1640 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1641 *pos++ = rates;
1642 memcpy(pos, &supp_rates[8], rates);
1643 }
1644
1645 add_extra_ies(skb, sdata->u.sta.ie_proberesp,
1646 sdata->u.sta.ie_proberesp_len);
1647
1648 ifsta->probe_resp = skb;
1649
1650 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON |
1651 IEEE80211_IFCC_BEACON_ENABLED);
1652
1653
1654 rates = 0;
1655 for (i = 0; i < supp_rates_len; i++) {
1656 int bitrate = (supp_rates[i] & 0x7f) * 5;
1657 for (j = 0; j < sband->n_bitrates; j++)
1658 if (sband->bitrates[j].bitrate == bitrate)
1659 rates |= BIT(j);
1660 }
1661 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1662
1663 ieee80211_sta_def_wmm_params(sdata, supp_rates_len, supp_rates);
1664
1665 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
1666 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1667 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1668
1669 ieee80211_led_assoc(local, true);
1670
1671 memset(&wrqu, 0, sizeof(wrqu));
1672 memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
1673 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1674
1675 return res;
1676 }
1677
1678 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1679 struct ieee80211_if_sta *ifsta,
1680 struct ieee80211_bss *bss)
1681 {
1682 return __ieee80211_sta_join_ibss(sdata, ifsta,
1683 bss->cbss.bssid,
1684 bss->cbss.beacon_interval,
1685 bss->cbss.channel->center_freq,
1686 bss->supp_rates_len, bss->supp_rates,
1687 bss->cbss.capability);
1688 }
1689
1690 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1691 struct ieee80211_mgmt *mgmt,
1692 size_t len,
1693 struct ieee80211_rx_status *rx_status,
1694 struct ieee802_11_elems *elems,
1695 bool beacon)
1696 {
1697 struct ieee80211_local *local = sdata->local;
1698 int freq;
1699 struct ieee80211_bss *bss;
1700 struct sta_info *sta;
1701 struct ieee80211_channel *channel;
1702 u64 beacon_timestamp, rx_timestamp;
1703 u32 supp_rates = 0;
1704 enum ieee80211_band band = rx_status->band;
1705
1706 if (elems->ds_params && elems->ds_params_len == 1)
1707 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1708 else
1709 freq = rx_status->freq;
1710
1711 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1712
1713 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1714 return;
1715
1716 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1717 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1718 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1719
1720 rcu_read_lock();
1721
1722 sta = sta_info_get(local, mgmt->sa);
1723 if (sta) {
1724 u32 prev_rates;
1725
1726 prev_rates = sta->sta.supp_rates[band];
1727 /* make sure mandatory rates are always added */
1728 sta->sta.supp_rates[band] = supp_rates |
1729 ieee80211_mandatory_rates(local, band);
1730
1731 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1732 if (sta->sta.supp_rates[band] != prev_rates)
1733 printk(KERN_DEBUG "%s: updated supp_rates set "
1734 "for %pM based on beacon info (0x%llx | "
1735 "0x%llx -> 0x%llx)\n",
1736 sdata->dev->name,
1737 sta->sta.addr,
1738 (unsigned long long) prev_rates,
1739 (unsigned long long) supp_rates,
1740 (unsigned long long) sta->sta.supp_rates[band]);
1741 #endif
1742 } else {
1743 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1744 }
1745
1746 rcu_read_unlock();
1747 }
1748
1749 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1750 channel, beacon);
1751 if (!bss)
1752 return;
1753
1754 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1755 (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1756 struct ieee80211_channel_sw_ie *sw_elem =
1757 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1758 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1759 }
1760
1761 /* was just updated in ieee80211_bss_info_update */
1762 beacon_timestamp = bss->cbss.tsf;
1763
1764 /*
1765 * In STA mode, the remaining parameters should not be overridden
1766 * by beacons because they're not necessarily accurate there.
1767 */
1768 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1769 bss->last_probe_resp && beacon) {
1770 ieee80211_rx_bss_put(local, bss);
1771 return;
1772 }
1773
1774 /* check if we need to merge IBSS */
1775 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1776 (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1777 bss->cbss.capability & WLAN_CAPABILITY_IBSS &&
1778 bss->cbss.channel == local->oper_channel &&
1779 elems->ssid_len == sdata->u.sta.ssid_len &&
1780 memcmp(elems->ssid, sdata->u.sta.ssid,
1781 sdata->u.sta.ssid_len) == 0) {
1782 if (rx_status->flag & RX_FLAG_TSFT) {
1783 /* in order for correct IBSS merging we need mactime
1784 *
1785 * since mactime is defined as the time the first data
1786 * symbol of the frame hits the PHY, and the timestamp
1787 * of the beacon is defined as "the time that the data
1788 * symbol containing the first bit of the timestamp is
1789 * transmitted to the PHY plus the transmitting STA’s
1790 * delays through its local PHY from the MAC-PHY
1791 * interface to its interface with the WM"
1792 * (802.11 11.1.2) - equals the time this bit arrives at
1793 * the receiver - we have to take into account the
1794 * offset between the two.
1795 * e.g: at 1 MBit that means mactime is 192 usec earlier
1796 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1797 */
1798 int rate;
1799 if (rx_status->flag & RX_FLAG_HT) {
1800 rate = 65; /* TODO: HT rates */
1801 } else {
1802 rate = local->hw.wiphy->bands[band]->
1803 bitrates[rx_status->rate_idx].bitrate;
1804 }
1805 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1806 } else if (local && local->ops && local->ops->get_tsf)
1807 /* second best option: get current TSF */
1808 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1809 else
1810 /* can't merge without knowing the TSF */
1811 rx_timestamp = -1LLU;
1812 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1813 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1814 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1815 mgmt->sa, mgmt->bssid,
1816 (unsigned long long)rx_timestamp,
1817 (unsigned long long)beacon_timestamp,
1818 (unsigned long long)(rx_timestamp - beacon_timestamp),
1819 jiffies);
1820 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1821 if (beacon_timestamp > rx_timestamp) {
1822 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1823 printk(KERN_DEBUG "%s: beacon TSF higher than "
1824 "local TSF - IBSS merge with BSSID %pM\n",
1825 sdata->dev->name, mgmt->bssid);
1826 #endif
1827 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1828 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1829 }
1830 }
1831
1832 ieee80211_rx_bss_put(local, bss);
1833 }
1834
1835
1836 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1837 struct ieee80211_mgmt *mgmt,
1838 size_t len,
1839 struct ieee80211_rx_status *rx_status)
1840 {
1841 size_t baselen;
1842 struct ieee802_11_elems elems;
1843 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1844
1845 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1846 return; /* ignore ProbeResp to foreign address */
1847
1848 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1849 if (baselen > len)
1850 return;
1851
1852 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1853 &elems);
1854
1855 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1856
1857 /* direct probe may be part of the association flow */
1858 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1859 &ifsta->request)) {
1860 printk(KERN_DEBUG "%s direct probe responded\n",
1861 sdata->dev->name);
1862 ieee80211_authenticate(sdata, ifsta);
1863 }
1864 }
1865
1866
1867 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1868 struct ieee80211_mgmt *mgmt,
1869 size_t len,
1870 struct ieee80211_rx_status *rx_status)
1871 {
1872 struct ieee80211_if_sta *ifsta;
1873 size_t baselen;
1874 struct ieee802_11_elems elems;
1875 struct ieee80211_local *local = sdata->local;
1876 u32 changed = 0;
1877 bool erp_valid, directed_tim;
1878 u8 erp_value = 0;
1879
1880 /* Process beacon from the current BSS */
1881 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1882 if (baselen > len)
1883 return;
1884
1885 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1886
1887 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1888
1889 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1890 return;
1891 ifsta = &sdata->u.sta;
1892
1893 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1894 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1895 return;
1896
1897 if (rx_status->freq != local->hw.conf.channel->center_freq)
1898 return;
1899
1900 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1901 elems.wmm_param_len);
1902
1903 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1904 local->hw.conf.flags & IEEE80211_CONF_PS) {
1905 directed_tim = ieee80211_check_tim(&elems, ifsta->aid);
1906
1907 if (directed_tim) {
1908 if (local->hw.conf.dynamic_ps_timeout > 0) {
1909 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1910 ieee80211_hw_config(local,
1911 IEEE80211_CONF_CHANGE_PS);
1912 ieee80211_send_nullfunc(local, sdata, 0);
1913 } else {
1914 local->pspolling = true;
1915
1916 /*
1917 * Here is assumed that the driver will be
1918 * able to send ps-poll frame and receive a
1919 * response even though power save mode is
1920 * enabled, but some drivers might require
1921 * to disable power save here. This needs
1922 * to be investigated.
1923 */
1924 ieee80211_send_pspoll(local, sdata);
1925 }
1926 }
1927 }
1928
1929 if (elems.erp_info && elems.erp_info_len >= 1) {
1930 erp_valid = true;
1931 erp_value = elems.erp_info[0];
1932 } else {
1933 erp_valid = false;
1934 }
1935 changed |= ieee80211_handle_bss_capability(sdata,
1936 le16_to_cpu(mgmt->u.beacon.capab_info),
1937 erp_valid, erp_value);
1938
1939
1940 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1941 struct sta_info *sta;
1942 struct ieee80211_supported_band *sband;
1943 u16 ap_ht_cap_flags;
1944
1945 rcu_read_lock();
1946
1947 sta = sta_info_get(local, ifsta->bssid);
1948 if (!sta) {
1949 rcu_read_unlock();
1950 return;
1951 }
1952
1953 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1954
1955 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1956 elems.ht_cap_elem, &sta->sta.ht_cap);
1957
1958 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1959
1960 rcu_read_unlock();
1961
1962 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1963 ap_ht_cap_flags);
1964 }
1965
1966 if (elems.country_elem) {
1967 /* Note we are only reviewing this on beacons
1968 * for the BSSID we are associated to */
1969 regulatory_hint_11d(local->hw.wiphy,
1970 elems.country_elem, elems.country_elem_len);
1971
1972 /* TODO: IBSS also needs this */
1973 if (elems.pwr_constr_elem)
1974 ieee80211_handle_pwr_constr(sdata,
1975 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1976 elems.pwr_constr_elem,
1977 elems.pwr_constr_elem_len);
1978 }
1979
1980 ieee80211_bss_info_change_notify(sdata, changed);
1981 }
1982
1983
1984 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1985 struct ieee80211_if_sta *ifsta,
1986 struct ieee80211_mgmt *mgmt,
1987 size_t len)
1988 {
1989 struct ieee80211_local *local = sdata->local;
1990 int tx_last_beacon;
1991 struct sk_buff *skb;
1992 struct ieee80211_mgmt *resp;
1993 u8 *pos, *end;
1994
1995 if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1996 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1997 len < 24 + 2 || !ifsta->probe_resp)
1998 return;
1999
2000 if (local->ops->tx_last_beacon)
2001 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2002 else
2003 tx_last_beacon = 1;
2004
2005 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2006 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
2007 " (tx_last_beacon=%d)\n",
2008 sdata->dev->name, mgmt->sa, mgmt->da,
2009 mgmt->bssid, tx_last_beacon);
2010 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2011
2012 if (!tx_last_beacon)
2013 return;
2014
2015 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2016 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2017 return;
2018
2019 end = ((u8 *) mgmt) + len;
2020 pos = mgmt->u.probe_req.variable;
2021 if (pos[0] != WLAN_EID_SSID ||
2022 pos + 2 + pos[1] > end) {
2023 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2024 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2025 "from %pM\n",
2026 sdata->dev->name, mgmt->sa);
2027 #endif
2028 return;
2029 }
2030 if (pos[1] != 0 &&
2031 (pos[1] != ifsta->ssid_len ||
2032 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
2033 /* Ignore ProbeReq for foreign SSID */
2034 return;
2035 }
2036
2037 /* Reply with ProbeResp */
2038 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
2039 if (!skb)
2040 return;
2041
2042 resp = (struct ieee80211_mgmt *) skb->data;
2043 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2044 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2045 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
2046 sdata->dev->name, resp->da);
2047 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2048 ieee80211_tx_skb(sdata, skb, 0);
2049 }
2050
2051 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
2052 struct ieee80211_rx_status *rx_status)
2053 {
2054 struct ieee80211_local *local = sdata->local;
2055 struct ieee80211_if_sta *ifsta;
2056 struct ieee80211_mgmt *mgmt;
2057 u16 fc;
2058
2059 if (skb->len < 24)
2060 goto fail;
2061
2062 ifsta = &sdata->u.sta;
2063
2064 mgmt = (struct ieee80211_mgmt *) skb->data;
2065 fc = le16_to_cpu(mgmt->frame_control);
2066
2067 switch (fc & IEEE80211_FCTL_STYPE) {
2068 case IEEE80211_STYPE_PROBE_REQ:
2069 case IEEE80211_STYPE_PROBE_RESP:
2070 case IEEE80211_STYPE_BEACON:
2071 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2072 case IEEE80211_STYPE_AUTH:
2073 case IEEE80211_STYPE_ASSOC_RESP:
2074 case IEEE80211_STYPE_REASSOC_RESP:
2075 case IEEE80211_STYPE_DEAUTH:
2076 case IEEE80211_STYPE_DISASSOC:
2077 skb_queue_tail(&ifsta->skb_queue, skb);
2078 queue_work(local->hw.workqueue, &ifsta->work);
2079 return;
2080 }
2081
2082 fail:
2083 kfree_skb(skb);
2084 }
2085
2086 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2087 struct sk_buff *skb)
2088 {
2089 struct ieee80211_rx_status *rx_status;
2090 struct ieee80211_if_sta *ifsta;
2091 struct ieee80211_mgmt *mgmt;
2092 u16 fc;
2093
2094 ifsta = &sdata->u.sta;
2095
2096 rx_status = (struct ieee80211_rx_status *) skb->cb;
2097 mgmt = (struct ieee80211_mgmt *) skb->data;
2098 fc = le16_to_cpu(mgmt->frame_control);
2099
2100 switch (fc & IEEE80211_FCTL_STYPE) {
2101 case IEEE80211_STYPE_PROBE_REQ:
2102 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
2103 break;
2104 case IEEE80211_STYPE_PROBE_RESP:
2105 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
2106 break;
2107 case IEEE80211_STYPE_BEACON:
2108 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2109 break;
2110 case IEEE80211_STYPE_AUTH:
2111 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2112 break;
2113 case IEEE80211_STYPE_ASSOC_RESP:
2114 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2115 break;
2116 case IEEE80211_STYPE_REASSOC_RESP:
2117 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2118 break;
2119 case IEEE80211_STYPE_DEAUTH:
2120 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2121 break;
2122 case IEEE80211_STYPE_DISASSOC:
2123 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2124 break;
2125 }
2126
2127 kfree_skb(skb);
2128 }
2129
2130
2131 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
2132 {
2133 struct ieee80211_local *local = sdata->local;
2134 int active = 0;
2135 struct sta_info *sta;
2136
2137 rcu_read_lock();
2138
2139 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2140 if (sta->sdata == sdata &&
2141 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2142 jiffies)) {
2143 active++;
2144 break;
2145 }
2146 }
2147
2148 rcu_read_unlock();
2149
2150 return active;
2151 }
2152
2153
2154 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2155 struct ieee80211_if_sta *ifsta)
2156 {
2157 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2158
2159 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2160 if (ieee80211_sta_active_ibss(sdata))
2161 return;
2162
2163 if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2164 (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2165 return;
2166
2167 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2168 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2169
2170 /* XXX maybe racy? */
2171 if (sdata->local->scan_req)
2172 return;
2173
2174 memcpy(sdata->local->int_scan_req.ssids[0].ssid,
2175 ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2176 sdata->local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2177 ieee80211_request_scan(sdata, &sdata->local->int_scan_req);
2178 }
2179
2180
2181 static void ieee80211_sta_timer(unsigned long data)
2182 {
2183 struct ieee80211_sub_if_data *sdata =
2184 (struct ieee80211_sub_if_data *) data;
2185 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2186 struct ieee80211_local *local = sdata->local;
2187
2188 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2189 queue_work(local->hw.workqueue, &ifsta->work);
2190 }
2191
2192 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2193 struct ieee80211_if_sta *ifsta)
2194 {
2195 struct ieee80211_local *local = sdata->local;
2196
2197 if (local->ops->reset_tsf) {
2198 /* Reset own TSF to allow time synchronization work. */
2199 local->ops->reset_tsf(local_to_hw(local));
2200 }
2201
2202 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2203
2204
2205 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2206 ifsta->auth_alg = WLAN_AUTH_OPEN;
2207 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2208 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2209 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2210 ifsta->auth_alg = WLAN_AUTH_LEAP;
2211 else
2212 ifsta->auth_alg = WLAN_AUTH_OPEN;
2213 ifsta->auth_transaction = -1;
2214 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2215 ifsta->assoc_scan_tries = 0;
2216 ifsta->direct_probe_tries = 0;
2217 ifsta->auth_tries = 0;
2218 ifsta->assoc_tries = 0;
2219 netif_tx_stop_all_queues(sdata->dev);
2220 netif_carrier_off(sdata->dev);
2221 }
2222
2223 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2224 struct ieee80211_if_sta *ifsta)
2225 {
2226 struct ieee80211_local *local = sdata->local;
2227 struct ieee80211_supported_band *sband;
2228 u8 *pos;
2229 u8 bssid[ETH_ALEN];
2230 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
2231 u16 capability;
2232 int i;
2233
2234 if (sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) {
2235 memcpy(bssid, ifsta->bssid, ETH_ALEN);
2236 } else {
2237 /* Generate random, not broadcast, locally administered BSSID. Mix in
2238 * own MAC address to make sure that devices that do not have proper
2239 * random number generator get different BSSID. */
2240 get_random_bytes(bssid, ETH_ALEN);
2241 for (i = 0; i < ETH_ALEN; i++)
2242 bssid[i] ^= sdata->dev->dev_addr[i];
2243 bssid[0] &= ~0x01;
2244 bssid[0] |= 0x02;
2245 }
2246
2247 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2248 sdata->dev->name, bssid);
2249
2250 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2251
2252 if (local->hw.conf.beacon_int == 0)
2253 local->hw.conf.beacon_int = 100;
2254
2255 capability = WLAN_CAPABILITY_IBSS;
2256
2257 if (sdata->default_key)
2258 capability |= WLAN_CAPABILITY_PRIVACY;
2259 else
2260 sdata->drop_unencrypted = 0;
2261
2262 pos = supp_rates;
2263 for (i = 0; i < sband->n_bitrates; i++) {
2264 int rate = sband->bitrates[i].bitrate;
2265 *pos++ = (u8) (rate / 5);
2266 }
2267
2268 return __ieee80211_sta_join_ibss(sdata, ifsta,
2269 bssid, local->hw.conf.beacon_int,
2270 local->hw.conf.channel->center_freq,
2271 sband->n_bitrates, supp_rates,
2272 capability);
2273 }
2274
2275
2276 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2277 struct ieee80211_if_sta *ifsta)
2278 {
2279 struct ieee80211_local *local = sdata->local;
2280 struct ieee80211_bss *bss;
2281 int active_ibss;
2282
2283 if (ifsta->ssid_len == 0)
2284 return -EINVAL;
2285
2286 active_ibss = ieee80211_sta_active_ibss(sdata);
2287 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2288 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2289 sdata->dev->name, active_ibss);
2290 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2291
2292 if (active_ibss)
2293 return 0;
2294
2295 if (ifsta->flags & IEEE80211_STA_BSSID_SET)
2296 bss = ieee80211_rx_bss_get(local, ifsta->bssid, 0,
2297 ifsta->ssid, ifsta->ssid_len);
2298 else
2299 bss = (void *)cfg80211_get_ibss(local->hw.wiphy,
2300 NULL,
2301 ifsta->ssid, ifsta->ssid_len);
2302
2303 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2304 if (bss)
2305 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
2306 "%pM\n", bss->cbss.bssid, ifsta->bssid);
2307 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2308
2309 if (bss &&
2310 (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) ||
2311 memcmp(ifsta->bssid, bss->cbss.bssid, ETH_ALEN))) {
2312 int ret;
2313
2314 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2315 " based on configured SSID\n",
2316 sdata->dev->name, bss->cbss.bssid);
2317
2318 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2319 ieee80211_rx_bss_put(local, bss);
2320 return ret;
2321 } else if (bss)
2322 ieee80211_rx_bss_put(local, bss);
2323
2324 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2325 printk(KERN_DEBUG " did not try to join ibss\n");
2326 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2327
2328 /* Selected IBSS not found in current scan results - try to scan */
2329 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2330 !ieee80211_sta_active_ibss(sdata)) {
2331 mod_timer(&ifsta->timer, jiffies +
2332 IEEE80211_IBSS_MERGE_INTERVAL);
2333 } else if (time_after(jiffies, local->last_scan_completed +
2334 IEEE80211_SCAN_INTERVAL)) {
2335 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2336 "join\n", sdata->dev->name);
2337
2338 /* XXX maybe racy? */
2339 if (local->scan_req)
2340 return -EBUSY;
2341
2342 memcpy(local->int_scan_req.ssids[0].ssid,
2343 ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2344 local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2345 return ieee80211_request_scan(sdata, &local->int_scan_req);
2346 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2347 int interval = IEEE80211_SCAN_INTERVAL;
2348
2349 if (time_after(jiffies, ifsta->ibss_join_req +
2350 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2351 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2352 (!(local->oper_channel->flags &
2353 IEEE80211_CHAN_NO_IBSS)))
2354 return ieee80211_sta_create_ibss(sdata, ifsta);
2355 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2356 printk(KERN_DEBUG "%s: IBSS not allowed on"
2357 " %d MHz\n", sdata->dev->name,
2358 local->hw.conf.channel->center_freq);
2359 }
2360
2361 /* No IBSS found - decrease scan interval and continue
2362 * scanning. */
2363 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2364 }
2365
2366 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2367 mod_timer(&ifsta->timer, jiffies + interval);
2368 return 0;
2369 }
2370
2371 return 0;
2372 }
2373
2374
2375 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2376 struct ieee80211_if_sta *ifsta)
2377 {
2378 struct ieee80211_local *local = sdata->local;
2379 struct ieee80211_bss *bss;
2380 u8 *bssid = ifsta->bssid, *ssid = ifsta->ssid;
2381 u8 ssid_len = ifsta->ssid_len;
2382 u16 capa_mask = WLAN_CAPABILITY_ESS;
2383 u16 capa_val = WLAN_CAPABILITY_ESS;
2384 struct ieee80211_channel *chan = local->oper_channel;
2385
2386 if (ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2387 IEEE80211_STA_AUTO_BSSID_SEL |
2388 IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2389 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2390 if (sdata->default_key)
2391 capa_val |= WLAN_CAPABILITY_PRIVACY;
2392 }
2393
2394 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2395 chan = NULL;
2396
2397 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2398 bssid = NULL;
2399
2400 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2401 ssid = NULL;
2402 ssid_len = 0;
2403 }
2404
2405 bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2406 bssid, ssid, ssid_len,
2407 capa_mask, capa_val);
2408
2409 if (bss) {
2410 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
2411 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2412 ieee80211_sta_set_ssid(sdata, bss->ssid,
2413 bss->ssid_len);
2414 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2415 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2416 bss->supp_rates);
2417 if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
2418 sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
2419 else
2420 sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
2421
2422 /* Send out direct probe if no probe resp was received or
2423 * the one we have is outdated
2424 */
2425 if (!bss->last_probe_resp ||
2426 time_after(jiffies, bss->last_probe_resp
2427 + IEEE80211_SCAN_RESULT_EXPIRE))
2428 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2429 else
2430 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2431
2432 ieee80211_rx_bss_put(local, bss);
2433 ieee80211_sta_reset_auth(sdata, ifsta);
2434 return 0;
2435 } else {
2436 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2437 ifsta->assoc_scan_tries++;
2438 /* XXX maybe racy? */
2439 if (local->scan_req)
2440 return -1;
2441 memcpy(local->int_scan_req.ssids[0].ssid,
2442 ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2443 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2444 local->int_scan_req.ssids[0].ssid_len = 0;
2445 else
2446 local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2447 ieee80211_start_scan(sdata, &local->int_scan_req);
2448 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2449 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2450 } else {
2451 ifsta->assoc_scan_tries = 0;
2452 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2453 }
2454 }
2455 return -1;
2456 }
2457
2458
2459 static void ieee80211_sta_work(struct work_struct *work)
2460 {
2461 struct ieee80211_sub_if_data *sdata =
2462 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2463 struct ieee80211_local *local = sdata->local;
2464 struct ieee80211_if_sta *ifsta;
2465 struct sk_buff *skb;
2466
2467 if (!netif_running(sdata->dev))
2468 return;
2469
2470 if (local->sw_scanning || local->hw_scanning)
2471 return;
2472
2473 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2474 sdata->vif.type != NL80211_IFTYPE_ADHOC))
2475 return;
2476 ifsta = &sdata->u.sta;
2477
2478 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2479 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2480
2481 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2482 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2483 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2484 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2485 ieee80211_start_scan(sdata, local->scan_req);
2486 return;
2487 }
2488
2489 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2490 if (ieee80211_sta_config_auth(sdata, ifsta))
2491 return;
2492 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2493 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2494 return;
2495
2496 switch (ifsta->state) {
2497 case IEEE80211_STA_MLME_DISABLED:
2498 break;
2499 case IEEE80211_STA_MLME_DIRECT_PROBE:
2500 ieee80211_direct_probe(sdata, ifsta);
2501 break;
2502 case IEEE80211_STA_MLME_AUTHENTICATE:
2503 ieee80211_authenticate(sdata, ifsta);
2504 break;
2505 case IEEE80211_STA_MLME_ASSOCIATE:
2506 ieee80211_associate(sdata, ifsta);
2507 break;
2508 case IEEE80211_STA_MLME_ASSOCIATED:
2509 ieee80211_associated(sdata, ifsta);
2510 break;
2511 case IEEE80211_STA_MLME_IBSS_SEARCH:
2512 ieee80211_sta_find_ibss(sdata, ifsta);
2513 break;
2514 case IEEE80211_STA_MLME_IBSS_JOINED:
2515 ieee80211_sta_merge_ibss(sdata, ifsta);
2516 break;
2517 default:
2518 WARN_ON(1);
2519 break;
2520 }
2521
2522 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2523 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2524 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2525
2526 ieee80211_set_disassoc(sdata, ifsta, false, true,
2527 WLAN_REASON_UNSPECIFIED);
2528 }
2529 }
2530
2531 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2532 {
2533 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2534 queue_work(sdata->local->hw.workqueue,
2535 &sdata->u.sta.work);
2536 }
2537
2538 /* interface setup */
2539 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2540 {
2541 struct ieee80211_if_sta *ifsta;
2542
2543 ifsta = &sdata->u.sta;
2544 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2545 INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2546 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2547 (unsigned long) sdata);
2548 setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2549 (unsigned long) sdata);
2550 skb_queue_head_init(&ifsta->skb_queue);
2551
2552 ifsta->capab = WLAN_CAPABILITY_ESS;
2553 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2554 IEEE80211_AUTH_ALG_SHARED_KEY;
2555 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2556 IEEE80211_STA_AUTO_BSSID_SEL |
2557 IEEE80211_STA_AUTO_CHANNEL_SEL;
2558 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2559 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2560 }
2561
2562 /*
2563 * Add a new IBSS station, will also be called by the RX code when,
2564 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2565 * must be callable in atomic context.
2566 */
2567 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2568 u8 *bssid,u8 *addr, u32 supp_rates)
2569 {
2570 struct ieee80211_local *local = sdata->local;
2571 struct sta_info *sta;
2572 int band = local->hw.conf.channel->band;
2573
2574 /* TODO: Could consider removing the least recently used entry and
2575 * allow new one to be added. */
2576 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2577 if (net_ratelimit()) {
2578 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2579 "entry %pM\n", sdata->dev->name, addr);
2580 }
2581 return NULL;
2582 }
2583
2584 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2585 return NULL;
2586
2587 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2588 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2589 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2590 #endif
2591
2592 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2593 if (!sta)
2594 return NULL;
2595
2596 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2597
2598 /* make sure mandatory rates are always added */
2599 sta->sta.supp_rates[band] = supp_rates |
2600 ieee80211_mandatory_rates(local, band);
2601
2602 rate_control_rate_init(sta);
2603
2604 if (sta_info_insert(sta))
2605 return NULL;
2606
2607 return sta;
2608 }
2609
2610 /* configuration hooks */
2611 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2612 struct ieee80211_if_sta *ifsta)
2613 {
2614 struct ieee80211_local *local = sdata->local;
2615
2616 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2617 return;
2618
2619 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2620 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2621 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2622 IEEE80211_STA_AUTO_SSID_SEL))) {
2623
2624 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2625 ieee80211_set_disassoc(sdata, ifsta, true, true,
2626 WLAN_REASON_DEAUTH_LEAVING);
2627
2628 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2629 queue_work(local->hw.workqueue, &ifsta->work);
2630 }
2631 }
2632
2633 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2634 {
2635 struct ieee80211_if_sta *ifsta;
2636
2637 if (len > IEEE80211_MAX_SSID_LEN)
2638 return -EINVAL;
2639
2640 ifsta = &sdata->u.sta;
2641
2642 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2643 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2644 memcpy(ifsta->ssid, ssid, len);
2645 ifsta->ssid_len = len;
2646 }
2647
2648 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2649
2650 if (len)
2651 ifsta->flags |= IEEE80211_STA_SSID_SET;
2652 else
2653 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2654
2655 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2656 ifsta->ibss_join_req = jiffies;
2657 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2658 return ieee80211_sta_find_ibss(sdata, ifsta);
2659 }
2660
2661 return 0;
2662 }
2663
2664 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2665 {
2666 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2667 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2668 *len = ifsta->ssid_len;
2669 return 0;
2670 }
2671
2672 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2673 {
2674 struct ieee80211_if_sta *ifsta;
2675
2676 ifsta = &sdata->u.sta;
2677
2678 if (is_valid_ether_addr(bssid)) {
2679 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2680 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2681 } else {
2682 memset(ifsta->bssid, 0, ETH_ALEN);
2683 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2684 }
2685
2686 if (netif_running(sdata->dev)) {
2687 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2688 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2689 "the low-level driver\n", sdata->dev->name);
2690 }
2691 }
2692
2693 return ieee80211_sta_set_ssid(sdata, ifsta->ssid, ifsta->ssid_len);
2694 }
2695
2696 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2697 {
2698 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2699
2700 kfree(ifsta->extra_ie);
2701 if (len == 0) {
2702 ifsta->extra_ie = NULL;
2703 ifsta->extra_ie_len = 0;
2704 return 0;
2705 }
2706 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2707 if (!ifsta->extra_ie) {
2708 ifsta->extra_ie_len = 0;
2709 return -ENOMEM;
2710 }
2711 memcpy(ifsta->extra_ie, ie, len);
2712 ifsta->extra_ie_len = len;
2713 return 0;
2714 }
2715
2716 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2717 {
2718 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2719
2720 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2721 sdata->dev->name, reason);
2722
2723 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2724 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2725 return -EINVAL;
2726
2727 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2728 return 0;
2729 }
2730
2731 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2732 {
2733 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2734
2735 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2736 sdata->dev->name, reason);
2737
2738 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2739 return -EINVAL;
2740
2741 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2742 return -1;
2743
2744 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2745 return 0;
2746 }
2747
2748 /* scan finished notification */
2749 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2750 {
2751 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2752 struct ieee80211_if_sta *ifsta;
2753
2754 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2755 ifsta = &sdata->u.sta;
2756 if ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2757 !ieee80211_sta_active_ibss(sdata))
2758 ieee80211_sta_find_ibss(sdata, ifsta);
2759 }
2760
2761 /* Restart STA timers */
2762 rcu_read_lock();
2763 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2764 ieee80211_restart_sta_timer(sdata);
2765 rcu_read_unlock();
2766 }
2767
2768 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2769 {
2770 struct ieee80211_local *local =
2771 container_of(work, struct ieee80211_local,
2772 dynamic_ps_disable_work);
2773
2774 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2775 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2776 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2777 }
2778
2779 ieee80211_wake_queues_by_reason(&local->hw,
2780 IEEE80211_QUEUE_STOP_REASON_PS);
2781 }
2782
2783 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2784 {
2785 struct ieee80211_local *local =
2786 container_of(work, struct ieee80211_local,
2787 dynamic_ps_enable_work);
2788 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2789
2790 if (local->hw.conf.flags & IEEE80211_CONF_PS)
2791 return;
2792
2793 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2794 ieee80211_send_nullfunc(local, sdata, 1);
2795
2796 local->hw.conf.flags |= IEEE80211_CONF_PS;
2797 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2798 }
2799
2800 void ieee80211_dynamic_ps_timer(unsigned long data)
2801 {
2802 struct ieee80211_local *local = (void *) data;
2803
2804 queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2805 }
(deprecated) Btrfs devel tree