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mac80211: enable IEEE80211_CONF_PS only when associated
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/wireless.h>
19 #include <linux/random.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/iw_handler.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
32 #define IEEE80211_AUTH_MAX_TRIES 3
33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
34 #define IEEE80211_ASSOC_MAX_TRIES 3
35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
36 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
38 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
41
42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
44
45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
46
47
48 /* utils */
49 static int ecw2cw(int ecw)
50 {
51 return (1 << ecw) - 1;
52 }
53
54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
55 {
56 u8 *end, *pos;
57
58 pos = bss->ies;
59 if (pos == NULL)
60 return NULL;
61 end = pos + bss->ies_len;
62
63 while (pos + 1 < end) {
64 if (pos + 2 + pos[1] > end)
65 break;
66 if (pos[0] == ie)
67 return pos;
68 pos += 2 + pos[1];
69 }
70
71 return NULL;
72 }
73
74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
75 struct ieee80211_supported_band *sband,
76 u64 *rates)
77 {
78 int i, j, count;
79 *rates = 0;
80 count = 0;
81 for (i = 0; i < bss->supp_rates_len; i++) {
82 int rate = (bss->supp_rates[i] & 0x7F) * 5;
83
84 for (j = 0; j < sband->n_bitrates; j++)
85 if (sband->bitrates[j].bitrate == rate) {
86 *rates |= BIT(j);
87 count++;
88 break;
89 }
90 }
91
92 return count;
93 }
94
95 /* also used by mesh code */
96 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
97 struct ieee802_11_elems *elems,
98 enum ieee80211_band band)
99 {
100 struct ieee80211_supported_band *sband;
101 struct ieee80211_rate *bitrates;
102 size_t num_rates;
103 u64 supp_rates;
104 int i, j;
105 sband = local->hw.wiphy->bands[band];
106
107 if (!sband) {
108 WARN_ON(1);
109 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
110 }
111
112 bitrates = sband->bitrates;
113 num_rates = sband->n_bitrates;
114 supp_rates = 0;
115 for (i = 0; i < elems->supp_rates_len +
116 elems->ext_supp_rates_len; i++) {
117 u8 rate = 0;
118 int own_rate;
119 if (i < elems->supp_rates_len)
120 rate = elems->supp_rates[i];
121 else if (elems->ext_supp_rates)
122 rate = elems->ext_supp_rates
123 [i - elems->supp_rates_len];
124 own_rate = 5 * (rate & 0x7f);
125 for (j = 0; j < num_rates; j++)
126 if (bitrates[j].bitrate == own_rate)
127 supp_rates |= BIT(j);
128 }
129 return supp_rates;
130 }
131
132 /* frame sending functions */
133
134 /* also used by scanning code */
135 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
136 u8 *ssid, size_t ssid_len)
137 {
138 struct ieee80211_local *local = sdata->local;
139 struct ieee80211_supported_band *sband;
140 struct sk_buff *skb;
141 struct ieee80211_mgmt *mgmt;
142 u8 *pos, *supp_rates, *esupp_rates = NULL;
143 int i;
144
145 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
146 if (!skb) {
147 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
148 "request\n", sdata->dev->name);
149 return;
150 }
151 skb_reserve(skb, local->hw.extra_tx_headroom);
152
153 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
154 memset(mgmt, 0, 24);
155 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
156 IEEE80211_STYPE_PROBE_REQ);
157 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
158 if (dst) {
159 memcpy(mgmt->da, dst, ETH_ALEN);
160 memcpy(mgmt->bssid, dst, ETH_ALEN);
161 } else {
162 memset(mgmt->da, 0xff, ETH_ALEN);
163 memset(mgmt->bssid, 0xff, ETH_ALEN);
164 }
165 pos = skb_put(skb, 2 + ssid_len);
166 *pos++ = WLAN_EID_SSID;
167 *pos++ = ssid_len;
168 memcpy(pos, ssid, ssid_len);
169
170 supp_rates = skb_put(skb, 2);
171 supp_rates[0] = WLAN_EID_SUPP_RATES;
172 supp_rates[1] = 0;
173 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
174
175 for (i = 0; i < sband->n_bitrates; i++) {
176 struct ieee80211_rate *rate = &sband->bitrates[i];
177 if (esupp_rates) {
178 pos = skb_put(skb, 1);
179 esupp_rates[1]++;
180 } else if (supp_rates[1] == 8) {
181 esupp_rates = skb_put(skb, 3);
182 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
183 esupp_rates[1] = 1;
184 pos = &esupp_rates[2];
185 } else {
186 pos = skb_put(skb, 1);
187 supp_rates[1]++;
188 }
189 *pos = rate->bitrate / 5;
190 }
191
192 ieee80211_tx_skb(sdata, skb, 0);
193 }
194
195 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
196 struct ieee80211_if_sta *ifsta,
197 int transaction, u8 *extra, size_t extra_len,
198 int encrypt)
199 {
200 struct ieee80211_local *local = sdata->local;
201 struct sk_buff *skb;
202 struct ieee80211_mgmt *mgmt;
203
204 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
205 sizeof(*mgmt) + 6 + extra_len);
206 if (!skb) {
207 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
208 "frame\n", sdata->dev->name);
209 return;
210 }
211 skb_reserve(skb, local->hw.extra_tx_headroom);
212
213 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
214 memset(mgmt, 0, 24 + 6);
215 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
216 IEEE80211_STYPE_AUTH);
217 if (encrypt)
218 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
219 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
220 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
221 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
222 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
223 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
224 ifsta->auth_transaction = transaction + 1;
225 mgmt->u.auth.status_code = cpu_to_le16(0);
226 if (extra)
227 memcpy(skb_put(skb, extra_len), extra, extra_len);
228
229 ieee80211_tx_skb(sdata, skb, encrypt);
230 }
231
232 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
233 struct ieee80211_if_sta *ifsta)
234 {
235 struct ieee80211_local *local = sdata->local;
236 struct sk_buff *skb;
237 struct ieee80211_mgmt *mgmt;
238 u8 *pos, *ies, *ht_ie;
239 int i, len, count, rates_len, supp_rates_len;
240 u16 capab;
241 struct ieee80211_bss *bss;
242 int wmm = 0;
243 struct ieee80211_supported_band *sband;
244 u64 rates = 0;
245
246 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
247 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
248 ifsta->ssid_len);
249 if (!skb) {
250 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
251 "frame\n", sdata->dev->name);
252 return;
253 }
254 skb_reserve(skb, local->hw.extra_tx_headroom);
255
256 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
257
258 capab = ifsta->capab;
259
260 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
261 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
262 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
263 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
264 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
265 }
266
267 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
268 local->hw.conf.channel->center_freq,
269 ifsta->ssid, ifsta->ssid_len);
270 if (bss) {
271 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
272 capab |= WLAN_CAPABILITY_PRIVACY;
273 if (bss->wmm_used)
274 wmm = 1;
275
276 /* get all rates supported by the device and the AP as
277 * some APs don't like getting a superset of their rates
278 * in the association request (e.g. D-Link DAP 1353 in
279 * b-only mode) */
280 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
281
282 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
283 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
284 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
285
286 ieee80211_rx_bss_put(local, bss);
287 } else {
288 rates = ~0;
289 rates_len = sband->n_bitrates;
290 }
291
292 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
293 memset(mgmt, 0, 24);
294 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
295 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
296 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
297
298 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
299 skb_put(skb, 10);
300 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
301 IEEE80211_STYPE_REASSOC_REQ);
302 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
303 mgmt->u.reassoc_req.listen_interval =
304 cpu_to_le16(local->hw.conf.listen_interval);
305 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
306 ETH_ALEN);
307 } else {
308 skb_put(skb, 4);
309 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
310 IEEE80211_STYPE_ASSOC_REQ);
311 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
312 mgmt->u.assoc_req.listen_interval =
313 cpu_to_le16(local->hw.conf.listen_interval);
314 }
315
316 /* SSID */
317 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
318 *pos++ = WLAN_EID_SSID;
319 *pos++ = ifsta->ssid_len;
320 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
321
322 /* add all rates which were marked to be used above */
323 supp_rates_len = rates_len;
324 if (supp_rates_len > 8)
325 supp_rates_len = 8;
326
327 len = sband->n_bitrates;
328 pos = skb_put(skb, supp_rates_len + 2);
329 *pos++ = WLAN_EID_SUPP_RATES;
330 *pos++ = supp_rates_len;
331
332 count = 0;
333 for (i = 0; i < sband->n_bitrates; i++) {
334 if (BIT(i) & rates) {
335 int rate = sband->bitrates[i].bitrate;
336 *pos++ = (u8) (rate / 5);
337 if (++count == 8)
338 break;
339 }
340 }
341
342 if (rates_len > count) {
343 pos = skb_put(skb, rates_len - count + 2);
344 *pos++ = WLAN_EID_EXT_SUPP_RATES;
345 *pos++ = rates_len - count;
346
347 for (i++; i < sband->n_bitrates; i++) {
348 if (BIT(i) & rates) {
349 int rate = sband->bitrates[i].bitrate;
350 *pos++ = (u8) (rate / 5);
351 }
352 }
353 }
354
355 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
356 /* 1. power capabilities */
357 pos = skb_put(skb, 4);
358 *pos++ = WLAN_EID_PWR_CAPABILITY;
359 *pos++ = 2;
360 *pos++ = 0; /* min tx power */
361 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
362
363 /* 2. supported channels */
364 /* TODO: get this in reg domain format */
365 pos = skb_put(skb, 2 * sband->n_channels + 2);
366 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
367 *pos++ = 2 * sband->n_channels;
368 for (i = 0; i < sband->n_channels; i++) {
369 *pos++ = ieee80211_frequency_to_channel(
370 sband->channels[i].center_freq);
371 *pos++ = 1; /* one channel in the subband*/
372 }
373 }
374
375 if (ifsta->extra_ie) {
376 pos = skb_put(skb, ifsta->extra_ie_len);
377 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
378 }
379
380 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
381 pos = skb_put(skb, 9);
382 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
383 *pos++ = 7; /* len */
384 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
385 *pos++ = 0x50;
386 *pos++ = 0xf2;
387 *pos++ = 2; /* WME */
388 *pos++ = 0; /* WME info */
389 *pos++ = 1; /* WME ver */
390 *pos++ = 0;
391 }
392
393 /* wmm support is a must to HT */
394 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
395 sband->ht_cap.ht_supported &&
396 (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
397 ht_ie[1] >= sizeof(struct ieee80211_ht_info)) {
398 struct ieee80211_ht_info *ht_info =
399 (struct ieee80211_ht_info *)(ht_ie + 2);
400 u16 cap = sband->ht_cap.cap;
401 __le16 tmp;
402 u32 flags = local->hw.conf.channel->flags;
403
404 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
405 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
406 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
407 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
408 cap &= ~IEEE80211_HT_CAP_SGI_40;
409 }
410 break;
411 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
412 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
413 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
414 cap &= ~IEEE80211_HT_CAP_SGI_40;
415 }
416 break;
417 }
418
419 tmp = cpu_to_le16(cap);
420 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
421 *pos++ = WLAN_EID_HT_CAPABILITY;
422 *pos++ = sizeof(struct ieee80211_ht_cap);
423 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
424 memcpy(pos, &tmp, sizeof(u16));
425 pos += sizeof(u16);
426 /* TODO: needs a define here for << 2 */
427 *pos++ = sband->ht_cap.ampdu_factor |
428 (sband->ht_cap.ampdu_density << 2);
429 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
430 }
431
432 kfree(ifsta->assocreq_ies);
433 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
434 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
435 if (ifsta->assocreq_ies)
436 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
437
438 ieee80211_tx_skb(sdata, skb, 0);
439 }
440
441
442 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
443 u16 stype, u16 reason)
444 {
445 struct ieee80211_local *local = sdata->local;
446 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
447 struct sk_buff *skb;
448 struct ieee80211_mgmt *mgmt;
449
450 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
451 if (!skb) {
452 printk(KERN_DEBUG "%s: failed to allocate buffer for "
453 "deauth/disassoc frame\n", sdata->dev->name);
454 return;
455 }
456 skb_reserve(skb, local->hw.extra_tx_headroom);
457
458 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
459 memset(mgmt, 0, 24);
460 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
461 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
462 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
463 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
464 skb_put(skb, 2);
465 /* u.deauth.reason_code == u.disassoc.reason_code */
466 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
467
468 ieee80211_tx_skb(sdata, skb, 0);
469 }
470
471 /* MLME */
472 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
473 struct ieee80211_bss *bss)
474 {
475 struct ieee80211_local *local = sdata->local;
476 int i, have_higher_than_11mbit = 0;
477
478 /* cf. IEEE 802.11 9.2.12 */
479 for (i = 0; i < bss->supp_rates_len; i++)
480 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
481 have_higher_than_11mbit = 1;
482
483 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
484 have_higher_than_11mbit)
485 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
486 else
487 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
488
489 ieee80211_set_wmm_default(sdata);
490 }
491
492 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
493 struct ieee80211_if_sta *ifsta,
494 u8 *wmm_param, size_t wmm_param_len)
495 {
496 struct ieee80211_tx_queue_params params;
497 size_t left;
498 int count;
499 u8 *pos;
500
501 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
502 return;
503
504 if (!wmm_param)
505 return;
506
507 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
508 return;
509 count = wmm_param[6] & 0x0f;
510 if (count == ifsta->wmm_last_param_set)
511 return;
512 ifsta->wmm_last_param_set = count;
513
514 pos = wmm_param + 8;
515 left = wmm_param_len - 8;
516
517 memset(&params, 0, sizeof(params));
518
519 if (!local->ops->conf_tx)
520 return;
521
522 local->wmm_acm = 0;
523 for (; left >= 4; left -= 4, pos += 4) {
524 int aci = (pos[0] >> 5) & 0x03;
525 int acm = (pos[0] >> 4) & 0x01;
526 int queue;
527
528 switch (aci) {
529 case 1:
530 queue = 3;
531 if (acm)
532 local->wmm_acm |= BIT(0) | BIT(3);
533 break;
534 case 2:
535 queue = 1;
536 if (acm)
537 local->wmm_acm |= BIT(4) | BIT(5);
538 break;
539 case 3:
540 queue = 0;
541 if (acm)
542 local->wmm_acm |= BIT(6) | BIT(7);
543 break;
544 case 0:
545 default:
546 queue = 2;
547 if (acm)
548 local->wmm_acm |= BIT(1) | BIT(2);
549 break;
550 }
551
552 params.aifs = pos[0] & 0x0f;
553 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
554 params.cw_min = ecw2cw(pos[1] & 0x0f);
555 params.txop = get_unaligned_le16(pos + 2);
556 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
557 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
558 "cWmin=%d cWmax=%d txop=%d\n",
559 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
560 params.cw_max, params.txop);
561 #endif
562 /* TODO: handle ACM (block TX, fallback to next lowest allowed
563 * AC for now) */
564 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
565 printk(KERN_DEBUG "%s: failed to set TX queue "
566 "parameters for queue %d\n", local->mdev->name, queue);
567 }
568 }
569 }
570
571 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
572 u16 capab, bool erp_valid, u8 erp)
573 {
574 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
575 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
576 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
577 #endif
578 u32 changed = 0;
579 bool use_protection;
580 bool use_short_preamble;
581 bool use_short_slot;
582
583 if (erp_valid) {
584 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
585 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
586 } else {
587 use_protection = false;
588 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
589 }
590
591 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
592
593 if (use_protection != bss_conf->use_cts_prot) {
594 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
595 if (net_ratelimit()) {
596 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
597 sdata->dev->name,
598 use_protection ? "enabled" : "disabled",
599 ifsta->bssid);
600 }
601 #endif
602 bss_conf->use_cts_prot = use_protection;
603 changed |= BSS_CHANGED_ERP_CTS_PROT;
604 }
605
606 if (use_short_preamble != bss_conf->use_short_preamble) {
607 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
608 if (net_ratelimit()) {
609 printk(KERN_DEBUG "%s: switched to %s barker preamble"
610 " (BSSID=%pM)\n",
611 sdata->dev->name,
612 use_short_preamble ? "short" : "long",
613 ifsta->bssid);
614 }
615 #endif
616 bss_conf->use_short_preamble = use_short_preamble;
617 changed |= BSS_CHANGED_ERP_PREAMBLE;
618 }
619
620 if (use_short_slot != bss_conf->use_short_slot) {
621 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
622 if (net_ratelimit()) {
623 printk(KERN_DEBUG "%s: switched to %s slot"
624 " (BSSID=%s)\n",
625 sdata->dev->name,
626 use_short_slot ? "short" : "long",
627 ifsta->bssid);
628 }
629 #endif
630 bss_conf->use_short_slot = use_short_slot;
631 changed |= BSS_CHANGED_ERP_SLOT;
632 }
633
634 return changed;
635 }
636
637 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
638 struct ieee80211_if_sta *ifsta)
639 {
640 union iwreq_data wrqu;
641 memset(&wrqu, 0, sizeof(wrqu));
642 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
643 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
644 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
645 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
646 }
647
648 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
649 struct ieee80211_if_sta *ifsta)
650 {
651 char *buf;
652 size_t len;
653 int i;
654 union iwreq_data wrqu;
655
656 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
657 return;
658
659 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
660 ifsta->assocresp_ies_len), GFP_KERNEL);
661 if (!buf)
662 return;
663
664 len = sprintf(buf, "ASSOCINFO(");
665 if (ifsta->assocreq_ies) {
666 len += sprintf(buf + len, "ReqIEs=");
667 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
668 len += sprintf(buf + len, "%02x",
669 ifsta->assocreq_ies[i]);
670 }
671 }
672 if (ifsta->assocresp_ies) {
673 if (ifsta->assocreq_ies)
674 len += sprintf(buf + len, " ");
675 len += sprintf(buf + len, "RespIEs=");
676 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
677 len += sprintf(buf + len, "%02x",
678 ifsta->assocresp_ies[i]);
679 }
680 }
681 len += sprintf(buf + len, ")");
682
683 if (len > IW_CUSTOM_MAX) {
684 len = sprintf(buf, "ASSOCRESPIE=");
685 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
686 len += sprintf(buf + len, "%02x",
687 ifsta->assocresp_ies[i]);
688 }
689 }
690
691 if (len <= IW_CUSTOM_MAX) {
692 memset(&wrqu, 0, sizeof(wrqu));
693 wrqu.data.length = len;
694 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
695 }
696
697 kfree(buf);
698 }
699
700
701 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
702 struct ieee80211_if_sta *ifsta,
703 u32 bss_info_changed)
704 {
705 struct ieee80211_local *local = sdata->local;
706 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
707
708 struct ieee80211_bss *bss;
709
710 bss_info_changed |= BSS_CHANGED_ASSOC;
711 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
712
713 if (sdata->vif.type != NL80211_IFTYPE_STATION)
714 return;
715
716 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
717 conf->channel->center_freq,
718 ifsta->ssid, ifsta->ssid_len);
719 if (bss) {
720 /* set timing information */
721 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
722 sdata->vif.bss_conf.timestamp = bss->timestamp;
723 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
724
725 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
726 bss->capability, bss->has_erp_value, bss->erp_value);
727
728 ieee80211_rx_bss_put(local, bss);
729 }
730
731 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
732 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
733 ieee80211_sta_send_associnfo(sdata, ifsta);
734
735 ifsta->last_probe = jiffies;
736 ieee80211_led_assoc(local, 1);
737
738 sdata->vif.bss_conf.assoc = 1;
739 /*
740 * For now just always ask the driver to update the basic rateset
741 * when we have associated, we aren't checking whether it actually
742 * changed or not.
743 */
744 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
745 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
746
747 if (local->powersave) {
748 local->hw.conf.flags |= IEEE80211_CONF_PS;
749 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
750 }
751
752 netif_tx_start_all_queues(sdata->dev);
753 netif_carrier_on(sdata->dev);
754
755 ieee80211_sta_send_apinfo(sdata, ifsta);
756 }
757
758 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
759 struct ieee80211_if_sta *ifsta)
760 {
761 ifsta->direct_probe_tries++;
762 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
763 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
764 sdata->dev->name, ifsta->bssid);
765 ifsta->state = IEEE80211_STA_MLME_DISABLED;
766 ieee80211_sta_send_apinfo(sdata, ifsta);
767 return;
768 }
769
770 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
771 sdata->dev->name, ifsta->bssid,
772 ifsta->direct_probe_tries);
773
774 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
775
776 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
777
778 /* Direct probe is sent to broadcast address as some APs
779 * will not answer to direct packet in unassociated state.
780 */
781 ieee80211_send_probe_req(sdata, NULL,
782 ifsta->ssid, ifsta->ssid_len);
783
784 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
785 }
786
787
788 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
789 struct ieee80211_if_sta *ifsta)
790 {
791 ifsta->auth_tries++;
792 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
793 printk(KERN_DEBUG "%s: authentication with AP %pM"
794 " timed out\n",
795 sdata->dev->name, ifsta->bssid);
796 ifsta->state = IEEE80211_STA_MLME_DISABLED;
797 ieee80211_sta_send_apinfo(sdata, ifsta);
798 return;
799 }
800
801 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
802 printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
803 sdata->dev->name, ifsta->bssid);
804
805 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
806
807 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
808 }
809
810 /*
811 * The disassoc 'reason' argument can be either our own reason
812 * if self disconnected or a reason code from the AP.
813 */
814 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
815 struct ieee80211_if_sta *ifsta, bool deauth,
816 bool self_disconnected, u16 reason)
817 {
818 struct ieee80211_local *local = sdata->local;
819 struct sta_info *sta;
820 u32 changed = 0, config_changed = 0;
821
822 rcu_read_lock();
823
824 sta = sta_info_get(local, ifsta->bssid);
825 if (!sta) {
826 rcu_read_unlock();
827 return;
828 }
829
830 if (deauth) {
831 ifsta->direct_probe_tries = 0;
832 ifsta->auth_tries = 0;
833 }
834 ifsta->assoc_scan_tries = 0;
835 ifsta->assoc_tries = 0;
836
837 netif_tx_stop_all_queues(sdata->dev);
838 netif_carrier_off(sdata->dev);
839
840 ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
841
842 if (self_disconnected) {
843 if (deauth)
844 ieee80211_send_deauth_disassoc(sdata,
845 IEEE80211_STYPE_DEAUTH, reason);
846 else
847 ieee80211_send_deauth_disassoc(sdata,
848 IEEE80211_STYPE_DISASSOC, reason);
849 }
850
851 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
852 changed |= ieee80211_reset_erp_info(sdata);
853
854 ieee80211_led_assoc(local, 0);
855 changed |= BSS_CHANGED_ASSOC;
856 sdata->vif.bss_conf.assoc = false;
857
858 ieee80211_sta_send_apinfo(sdata, ifsta);
859
860 if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
861 ifsta->state = IEEE80211_STA_MLME_DISABLED;
862
863 rcu_read_unlock();
864
865 local->hw.conf.ht.enabled = false;
866 local->oper_channel_type = NL80211_CHAN_NO_HT;
867 config_changed |= IEEE80211_CONF_CHANGE_HT;
868
869 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
870 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
871 config_changed |= IEEE80211_CONF_CHANGE_PS;
872 }
873
874 ieee80211_hw_config(local, config_changed);
875 ieee80211_bss_info_change_notify(sdata, changed);
876
877 rcu_read_lock();
878
879 sta = sta_info_get(local, ifsta->bssid);
880 if (!sta) {
881 rcu_read_unlock();
882 return;
883 }
884
885 sta_info_unlink(&sta);
886
887 rcu_read_unlock();
888
889 sta_info_destroy(sta);
890 }
891
892 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
893 {
894 if (!sdata || !sdata->default_key ||
895 sdata->default_key->conf.alg != ALG_WEP)
896 return 0;
897 return 1;
898 }
899
900 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
901 struct ieee80211_if_sta *ifsta)
902 {
903 struct ieee80211_local *local = sdata->local;
904 struct ieee80211_bss *bss;
905 int bss_privacy;
906 int wep_privacy;
907 int privacy_invoked;
908
909 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
910 return 0;
911
912 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
913 local->hw.conf.channel->center_freq,
914 ifsta->ssid, ifsta->ssid_len);
915 if (!bss)
916 return 0;
917
918 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
919 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
920 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
921
922 ieee80211_rx_bss_put(local, bss);
923
924 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
925 return 0;
926
927 return 1;
928 }
929
930 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
931 struct ieee80211_if_sta *ifsta)
932 {
933 ifsta->assoc_tries++;
934 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
935 printk(KERN_DEBUG "%s: association with AP %pM"
936 " timed out\n",
937 sdata->dev->name, ifsta->bssid);
938 ifsta->state = IEEE80211_STA_MLME_DISABLED;
939 ieee80211_sta_send_apinfo(sdata, ifsta);
940 return;
941 }
942
943 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
944 printk(KERN_DEBUG "%s: associate with AP %pM\n",
945 sdata->dev->name, ifsta->bssid);
946 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
947 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
948 "mixed-cell disabled - abort association\n", sdata->dev->name);
949 ifsta->state = IEEE80211_STA_MLME_DISABLED;
950 return;
951 }
952
953 ieee80211_send_assoc(sdata, ifsta);
954
955 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
956 }
957
958
959 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
960 struct ieee80211_if_sta *ifsta)
961 {
962 struct ieee80211_local *local = sdata->local;
963 struct sta_info *sta;
964 int disassoc;
965
966 /* TODO: start monitoring current AP signal quality and number of
967 * missed beacons. Scan other channels every now and then and search
968 * for better APs. */
969 /* TODO: remove expired BSSes */
970
971 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
972
973 rcu_read_lock();
974
975 sta = sta_info_get(local, ifsta->bssid);
976 if (!sta) {
977 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
978 sdata->dev->name, ifsta->bssid);
979 disassoc = 1;
980 } else {
981 disassoc = 0;
982 if (time_after(jiffies,
983 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
984 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
985 printk(KERN_DEBUG "%s: No ProbeResp from "
986 "current AP %pM - assume out of "
987 "range\n",
988 sdata->dev->name, ifsta->bssid);
989 disassoc = 1;
990 } else
991 ieee80211_send_probe_req(sdata, ifsta->bssid,
992 ifsta->ssid,
993 ifsta->ssid_len);
994 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
995 } else {
996 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
997 if (time_after(jiffies, ifsta->last_probe +
998 IEEE80211_PROBE_INTERVAL)) {
999 ifsta->last_probe = jiffies;
1000 ieee80211_send_probe_req(sdata, ifsta->bssid,
1001 ifsta->ssid,
1002 ifsta->ssid_len);
1003 }
1004 }
1005 }
1006
1007 rcu_read_unlock();
1008
1009 if (disassoc)
1010 ieee80211_set_disassoc(sdata, ifsta, true, true,
1011 WLAN_REASON_PREV_AUTH_NOT_VALID);
1012 else
1013 mod_timer(&ifsta->timer, jiffies +
1014 IEEE80211_MONITORING_INTERVAL);
1015 }
1016
1017
1018 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1019 struct ieee80211_if_sta *ifsta)
1020 {
1021 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1022 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1023 ieee80211_associate(sdata, ifsta);
1024 }
1025
1026
1027 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1028 struct ieee80211_if_sta *ifsta,
1029 struct ieee80211_mgmt *mgmt,
1030 size_t len)
1031 {
1032 u8 *pos;
1033 struct ieee802_11_elems elems;
1034
1035 pos = mgmt->u.auth.variable;
1036 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1037 if (!elems.challenge)
1038 return;
1039 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1040 elems.challenge_len + 2, 1);
1041 }
1042
1043 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1044 struct ieee80211_if_sta *ifsta,
1045 struct ieee80211_mgmt *mgmt,
1046 size_t len)
1047 {
1048 u16 auth_alg, auth_transaction, status_code;
1049
1050 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1051 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1052 return;
1053
1054 if (len < 24 + 6)
1055 return;
1056
1057 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1058 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1059 return;
1060
1061 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1062 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1063 return;
1064
1065 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1066 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1067 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1068
1069 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1070 /*
1071 * IEEE 802.11 standard does not require authentication in IBSS
1072 * networks and most implementations do not seem to use it.
1073 * However, try to reply to authentication attempts if someone
1074 * has actually implemented this.
1075 */
1076 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1077 return;
1078 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1079 }
1080
1081 if (auth_alg != ifsta->auth_alg ||
1082 auth_transaction != ifsta->auth_transaction)
1083 return;
1084
1085 if (status_code != WLAN_STATUS_SUCCESS) {
1086 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1087 u8 algs[3];
1088 const int num_algs = ARRAY_SIZE(algs);
1089 int i, pos;
1090 algs[0] = algs[1] = algs[2] = 0xff;
1091 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1092 algs[0] = WLAN_AUTH_OPEN;
1093 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1094 algs[1] = WLAN_AUTH_SHARED_KEY;
1095 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1096 algs[2] = WLAN_AUTH_LEAP;
1097 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1098 pos = 0;
1099 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1100 pos = 1;
1101 else
1102 pos = 2;
1103 for (i = 0; i < num_algs; i++) {
1104 pos++;
1105 if (pos >= num_algs)
1106 pos = 0;
1107 if (algs[pos] == ifsta->auth_alg ||
1108 algs[pos] == 0xff)
1109 continue;
1110 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1111 !ieee80211_sta_wep_configured(sdata))
1112 continue;
1113 ifsta->auth_alg = algs[pos];
1114 break;
1115 }
1116 }
1117 return;
1118 }
1119
1120 switch (ifsta->auth_alg) {
1121 case WLAN_AUTH_OPEN:
1122 case WLAN_AUTH_LEAP:
1123 ieee80211_auth_completed(sdata, ifsta);
1124 break;
1125 case WLAN_AUTH_SHARED_KEY:
1126 if (ifsta->auth_transaction == 4)
1127 ieee80211_auth_completed(sdata, ifsta);
1128 else
1129 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1130 break;
1131 }
1132 }
1133
1134
1135 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1136 struct ieee80211_if_sta *ifsta,
1137 struct ieee80211_mgmt *mgmt,
1138 size_t len)
1139 {
1140 u16 reason_code;
1141
1142 if (len < 24 + 2)
1143 return;
1144
1145 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1146 return;
1147
1148 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1149
1150 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1151 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1152 sdata->dev->name, reason_code);
1153
1154 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1155 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1156 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1157 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1158 mod_timer(&ifsta->timer, jiffies +
1159 IEEE80211_RETRY_AUTH_INTERVAL);
1160 }
1161
1162 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1163 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1164 }
1165
1166
1167 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1168 struct ieee80211_if_sta *ifsta,
1169 struct ieee80211_mgmt *mgmt,
1170 size_t len)
1171 {
1172 u16 reason_code;
1173
1174 if (len < 24 + 2)
1175 return;
1176
1177 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1178 return;
1179
1180 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1181
1182 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1183 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1184 sdata->dev->name, reason_code);
1185
1186 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1187 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1188 mod_timer(&ifsta->timer, jiffies +
1189 IEEE80211_RETRY_AUTH_INTERVAL);
1190 }
1191
1192 ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1193 }
1194
1195
1196 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1197 struct ieee80211_if_sta *ifsta,
1198 struct ieee80211_mgmt *mgmt,
1199 size_t len,
1200 int reassoc)
1201 {
1202 struct ieee80211_local *local = sdata->local;
1203 struct ieee80211_supported_band *sband;
1204 struct sta_info *sta;
1205 u64 rates, basic_rates;
1206 u16 capab_info, status_code, aid;
1207 struct ieee802_11_elems elems;
1208 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1209 u8 *pos;
1210 u32 changed = 0;
1211 int i, j;
1212 bool have_higher_than_11mbit = false, newsta = false;
1213 u16 ap_ht_cap_flags;
1214
1215 /* AssocResp and ReassocResp have identical structure, so process both
1216 * of them in this function. */
1217
1218 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1219 return;
1220
1221 if (len < 24 + 6)
1222 return;
1223
1224 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1225 return;
1226
1227 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1228 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1229 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1230
1231 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1232 "status=%d aid=%d)\n",
1233 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1234 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1235
1236 if (status_code != WLAN_STATUS_SUCCESS) {
1237 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1238 sdata->dev->name, status_code);
1239 /* if this was a reassociation, ensure we try a "full"
1240 * association next time. This works around some broken APs
1241 * which do not correctly reject reassociation requests. */
1242 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1243 return;
1244 }
1245
1246 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1247 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1248 "set\n", sdata->dev->name, aid);
1249 aid &= ~(BIT(15) | BIT(14));
1250
1251 pos = mgmt->u.assoc_resp.variable;
1252 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1253
1254 if (!elems.supp_rates) {
1255 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1256 sdata->dev->name);
1257 return;
1258 }
1259
1260 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1261 ifsta->aid = aid;
1262 ifsta->ap_capab = capab_info;
1263
1264 kfree(ifsta->assocresp_ies);
1265 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1266 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1267 if (ifsta->assocresp_ies)
1268 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1269
1270 rcu_read_lock();
1271
1272 /* Add STA entry for the AP */
1273 sta = sta_info_get(local, ifsta->bssid);
1274 if (!sta) {
1275 struct ieee80211_bss *bss;
1276
1277 newsta = true;
1278
1279 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1280 if (!sta) {
1281 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1282 " the AP\n", sdata->dev->name);
1283 rcu_read_unlock();
1284 return;
1285 }
1286 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1287 local->hw.conf.channel->center_freq,
1288 ifsta->ssid, ifsta->ssid_len);
1289 if (bss) {
1290 sta->last_signal = bss->signal;
1291 sta->last_qual = bss->qual;
1292 sta->last_noise = bss->noise;
1293 ieee80211_rx_bss_put(local, bss);
1294 }
1295
1296 /* update new sta with its last rx activity */
1297 sta->last_rx = jiffies;
1298 }
1299
1300 /*
1301 * FIXME: Do we really need to update the sta_info's information here?
1302 * We already know about the AP (we found it in our list) so it
1303 * should already be filled with the right info, no?
1304 * As is stands, all this is racy because typically we assume
1305 * the information that is filled in here (except flags) doesn't
1306 * change while a STA structure is alive. As such, it should move
1307 * to between the sta_info_alloc() and sta_info_insert() above.
1308 */
1309
1310 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1311 WLAN_STA_AUTHORIZED);
1312
1313 rates = 0;
1314 basic_rates = 0;
1315 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1316
1317 for (i = 0; i < elems.supp_rates_len; i++) {
1318 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1319 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1320
1321 if (rate > 110)
1322 have_higher_than_11mbit = true;
1323
1324 for (j = 0; j < sband->n_bitrates; j++) {
1325 if (sband->bitrates[j].bitrate == rate) {
1326 rates |= BIT(j);
1327 if (is_basic)
1328 basic_rates |= BIT(j);
1329 break;
1330 }
1331 }
1332 }
1333
1334 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1335 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1336 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1337
1338 if (rate > 110)
1339 have_higher_than_11mbit = true;
1340
1341 for (j = 0; j < sband->n_bitrates; j++) {
1342 if (sband->bitrates[j].bitrate == rate) {
1343 rates |= BIT(j);
1344 if (is_basic)
1345 basic_rates |= BIT(j);
1346 break;
1347 }
1348 }
1349 }
1350
1351 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1352 sdata->vif.bss_conf.basic_rates = basic_rates;
1353
1354 /* cf. IEEE 802.11 9.2.12 */
1355 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1356 have_higher_than_11mbit)
1357 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1358 else
1359 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1360
1361 if (elems.ht_cap_elem)
1362 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1363 elems.ht_cap_elem, &sta->sta.ht_cap);
1364
1365 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1366
1367 rate_control_rate_init(sta);
1368
1369 if (elems.wmm_param)
1370 set_sta_flags(sta, WLAN_STA_WME);
1371
1372 if (newsta) {
1373 int err = sta_info_insert(sta);
1374 if (err) {
1375 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1376 " the AP (error %d)\n", sdata->dev->name, err);
1377 rcu_read_unlock();
1378 return;
1379 }
1380 }
1381
1382 rcu_read_unlock();
1383
1384 if (elems.wmm_param)
1385 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1386 elems.wmm_param_len);
1387
1388 if (elems.ht_info_elem && elems.wmm_param &&
1389 (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1390 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1391 ap_ht_cap_flags);
1392
1393 /* set AID and assoc capability,
1394 * ieee80211_set_associated() will tell the driver */
1395 bss_conf->aid = aid;
1396 bss_conf->assoc_capability = capab_info;
1397 ieee80211_set_associated(sdata, ifsta, changed);
1398
1399 ieee80211_associated(sdata, ifsta);
1400 }
1401
1402
1403 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1404 struct ieee80211_if_sta *ifsta,
1405 struct ieee80211_bss *bss)
1406 {
1407 struct ieee80211_local *local = sdata->local;
1408 int res, rates, i, j;
1409 struct sk_buff *skb;
1410 struct ieee80211_mgmt *mgmt;
1411 u8 *pos;
1412 struct ieee80211_supported_band *sband;
1413 union iwreq_data wrqu;
1414
1415 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1416 if (!skb) {
1417 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1418 "response\n", sdata->dev->name);
1419 return -ENOMEM;
1420 }
1421
1422 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1423
1424 /* Remove possible STA entries from other IBSS networks. */
1425 sta_info_flush_delayed(sdata);
1426
1427 if (local->ops->reset_tsf) {
1428 /* Reset own TSF to allow time synchronization work. */
1429 local->ops->reset_tsf(local_to_hw(local));
1430 }
1431 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1432 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1433 if (res)
1434 return res;
1435
1436 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1437
1438 sdata->drop_unencrypted = bss->capability &
1439 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1440
1441 res = ieee80211_set_freq(sdata, bss->freq);
1442
1443 if (res)
1444 return res;
1445
1446 /* Build IBSS probe response */
1447
1448 skb_reserve(skb, local->hw.extra_tx_headroom);
1449
1450 mgmt = (struct ieee80211_mgmt *)
1451 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1452 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1453 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1454 IEEE80211_STYPE_PROBE_RESP);
1455 memset(mgmt->da, 0xff, ETH_ALEN);
1456 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1457 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1458 mgmt->u.beacon.beacon_int =
1459 cpu_to_le16(local->hw.conf.beacon_int);
1460 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1461 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1462
1463 pos = skb_put(skb, 2 + ifsta->ssid_len);
1464 *pos++ = WLAN_EID_SSID;
1465 *pos++ = ifsta->ssid_len;
1466 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1467
1468 rates = bss->supp_rates_len;
1469 if (rates > 8)
1470 rates = 8;
1471 pos = skb_put(skb, 2 + rates);
1472 *pos++ = WLAN_EID_SUPP_RATES;
1473 *pos++ = rates;
1474 memcpy(pos, bss->supp_rates, rates);
1475
1476 if (bss->band == IEEE80211_BAND_2GHZ) {
1477 pos = skb_put(skb, 2 + 1);
1478 *pos++ = WLAN_EID_DS_PARAMS;
1479 *pos++ = 1;
1480 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1481 }
1482
1483 pos = skb_put(skb, 2 + 2);
1484 *pos++ = WLAN_EID_IBSS_PARAMS;
1485 *pos++ = 2;
1486 /* FIX: set ATIM window based on scan results */
1487 *pos++ = 0;
1488 *pos++ = 0;
1489
1490 if (bss->supp_rates_len > 8) {
1491 rates = bss->supp_rates_len - 8;
1492 pos = skb_put(skb, 2 + rates);
1493 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1494 *pos++ = rates;
1495 memcpy(pos, &bss->supp_rates[8], rates);
1496 }
1497
1498 ifsta->probe_resp = skb;
1499
1500 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1501
1502
1503 rates = 0;
1504 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1505 for (i = 0; i < bss->supp_rates_len; i++) {
1506 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1507 for (j = 0; j < sband->n_bitrates; j++)
1508 if (sband->bitrates[j].bitrate == bitrate)
1509 rates |= BIT(j);
1510 }
1511 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1512
1513 ieee80211_sta_def_wmm_params(sdata, bss);
1514
1515 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1516 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1517
1518 ieee80211_led_assoc(local, true);
1519
1520 memset(&wrqu, 0, sizeof(wrqu));
1521 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1522 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1523
1524 return res;
1525 }
1526
1527 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1528 struct ieee80211_mgmt *mgmt,
1529 size_t len,
1530 struct ieee80211_rx_status *rx_status,
1531 struct ieee802_11_elems *elems,
1532 bool beacon)
1533 {
1534 struct ieee80211_local *local = sdata->local;
1535 int freq;
1536 struct ieee80211_bss *bss;
1537 struct sta_info *sta;
1538 struct ieee80211_channel *channel;
1539 u64 beacon_timestamp, rx_timestamp;
1540 u64 supp_rates = 0;
1541 enum ieee80211_band band = rx_status->band;
1542
1543 if (elems->ds_params && elems->ds_params_len == 1)
1544 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1545 else
1546 freq = rx_status->freq;
1547
1548 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1549
1550 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1551 return;
1552
1553 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1554 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1555 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1556
1557 rcu_read_lock();
1558
1559 sta = sta_info_get(local, mgmt->sa);
1560 if (sta) {
1561 u64 prev_rates;
1562
1563 prev_rates = sta->sta.supp_rates[band];
1564 /* make sure mandatory rates are always added */
1565 sta->sta.supp_rates[band] = supp_rates |
1566 ieee80211_mandatory_rates(local, band);
1567
1568 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1569 if (sta->sta.supp_rates[band] != prev_rates)
1570 printk(KERN_DEBUG "%s: updated supp_rates set "
1571 "for %pM based on beacon info (0x%llx | "
1572 "0x%llx -> 0x%llx)\n",
1573 sdata->dev->name,
1574 sta->sta.addr,
1575 (unsigned long long) prev_rates,
1576 (unsigned long long) supp_rates,
1577 (unsigned long long) sta->sta.supp_rates[band]);
1578 #endif
1579 } else {
1580 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1581 }
1582
1583 rcu_read_unlock();
1584 }
1585
1586 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1587 freq, beacon);
1588 if (!bss)
1589 return;
1590
1591 /* was just updated in ieee80211_bss_info_update */
1592 beacon_timestamp = bss->timestamp;
1593
1594 /*
1595 * In STA mode, the remaining parameters should not be overridden
1596 * by beacons because they're not necessarily accurate there.
1597 */
1598 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1599 bss->last_probe_resp && beacon) {
1600 ieee80211_rx_bss_put(local, bss);
1601 return;
1602 }
1603
1604 /* check if we need to merge IBSS */
1605 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1606 bss->capability & WLAN_CAPABILITY_IBSS &&
1607 bss->freq == local->oper_channel->center_freq &&
1608 elems->ssid_len == sdata->u.sta.ssid_len &&
1609 memcmp(elems->ssid, sdata->u.sta.ssid,
1610 sdata->u.sta.ssid_len) == 0) {
1611 if (rx_status->flag & RX_FLAG_TSFT) {
1612 /* in order for correct IBSS merging we need mactime
1613 *
1614 * since mactime is defined as the time the first data
1615 * symbol of the frame hits the PHY, and the timestamp
1616 * of the beacon is defined as "the time that the data
1617 * symbol containing the first bit of the timestamp is
1618 * transmitted to the PHY plus the transmitting STA’s
1619 * delays through its local PHY from the MAC-PHY
1620 * interface to its interface with the WM"
1621 * (802.11 11.1.2) - equals the time this bit arrives at
1622 * the receiver - we have to take into account the
1623 * offset between the two.
1624 * e.g: at 1 MBit that means mactime is 192 usec earlier
1625 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1626 */
1627 int rate;
1628 if (rx_status->flag & RX_FLAG_HT) {
1629 rate = 65; /* TODO: HT rates */
1630 } else {
1631 rate = local->hw.wiphy->bands[band]->
1632 bitrates[rx_status->rate_idx].bitrate;
1633 }
1634 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1635 } else if (local && local->ops && local->ops->get_tsf)
1636 /* second best option: get current TSF */
1637 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1638 else
1639 /* can't merge without knowing the TSF */
1640 rx_timestamp = -1LLU;
1641 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1642 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1643 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1644 mgmt->sa, mgmt->bssid,
1645 (unsigned long long)rx_timestamp,
1646 (unsigned long long)beacon_timestamp,
1647 (unsigned long long)(rx_timestamp - beacon_timestamp),
1648 jiffies);
1649 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1650 if (beacon_timestamp > rx_timestamp) {
1651 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1652 printk(KERN_DEBUG "%s: beacon TSF higher than "
1653 "local TSF - IBSS merge with BSSID %pM\n",
1654 sdata->dev->name, mgmt->bssid);
1655 #endif
1656 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1657 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1658 }
1659 }
1660
1661 ieee80211_rx_bss_put(local, bss);
1662 }
1663
1664
1665 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1666 struct ieee80211_mgmt *mgmt,
1667 size_t len,
1668 struct ieee80211_rx_status *rx_status)
1669 {
1670 size_t baselen;
1671 struct ieee802_11_elems elems;
1672 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1673
1674 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1675 return; /* ignore ProbeResp to foreign address */
1676
1677 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1678 if (baselen > len)
1679 return;
1680
1681 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1682 &elems);
1683
1684 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1685
1686 /* direct probe may be part of the association flow */
1687 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1688 &ifsta->request)) {
1689 printk(KERN_DEBUG "%s direct probe responded\n",
1690 sdata->dev->name);
1691 ieee80211_authenticate(sdata, ifsta);
1692 }
1693 }
1694
1695
1696 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1697 struct ieee80211_mgmt *mgmt,
1698 size_t len,
1699 struct ieee80211_rx_status *rx_status)
1700 {
1701 struct ieee80211_if_sta *ifsta;
1702 size_t baselen;
1703 struct ieee802_11_elems elems;
1704 struct ieee80211_local *local = sdata->local;
1705 u32 changed = 0;
1706 bool erp_valid;
1707 u8 erp_value = 0;
1708
1709 /* Process beacon from the current BSS */
1710 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1711 if (baselen > len)
1712 return;
1713
1714 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1715
1716 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1717
1718 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1719 return;
1720 ifsta = &sdata->u.sta;
1721
1722 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1723 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1724 return;
1725
1726 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1727 elems.wmm_param_len);
1728
1729
1730 if (elems.erp_info && elems.erp_info_len >= 1) {
1731 erp_valid = true;
1732 erp_value = elems.erp_info[0];
1733 } else {
1734 erp_valid = false;
1735 }
1736 changed |= ieee80211_handle_bss_capability(sdata,
1737 le16_to_cpu(mgmt->u.beacon.capab_info),
1738 erp_valid, erp_value);
1739
1740
1741 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1742 struct sta_info *sta;
1743 struct ieee80211_supported_band *sband;
1744 u16 ap_ht_cap_flags;
1745
1746 rcu_read_lock();
1747
1748 sta = sta_info_get(local, ifsta->bssid);
1749 if (!sta) {
1750 rcu_read_unlock();
1751 return;
1752 }
1753
1754 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1755
1756 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1757 elems.ht_cap_elem, &sta->sta.ht_cap);
1758
1759 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1760
1761 rcu_read_unlock();
1762
1763 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1764 ap_ht_cap_flags);
1765 }
1766
1767 if (elems.country_elem) {
1768 /* Note we are only reviewing this on beacons
1769 * for the BSSID we are associated to */
1770 regulatory_hint_11d(local->hw.wiphy,
1771 elems.country_elem, elems.country_elem_len);
1772 }
1773
1774 ieee80211_bss_info_change_notify(sdata, changed);
1775 }
1776
1777
1778 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1779 struct ieee80211_if_sta *ifsta,
1780 struct ieee80211_mgmt *mgmt,
1781 size_t len,
1782 struct ieee80211_rx_status *rx_status)
1783 {
1784 struct ieee80211_local *local = sdata->local;
1785 int tx_last_beacon;
1786 struct sk_buff *skb;
1787 struct ieee80211_mgmt *resp;
1788 u8 *pos, *end;
1789
1790 if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1791 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1792 len < 24 + 2 || !ifsta->probe_resp)
1793 return;
1794
1795 if (local->ops->tx_last_beacon)
1796 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1797 else
1798 tx_last_beacon = 1;
1799
1800 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1801 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1802 " (tx_last_beacon=%d)\n",
1803 sdata->dev->name, mgmt->sa, mgmt->da,
1804 mgmt->bssid, tx_last_beacon);
1805 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1806
1807 if (!tx_last_beacon)
1808 return;
1809
1810 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1811 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1812 return;
1813
1814 end = ((u8 *) mgmt) + len;
1815 pos = mgmt->u.probe_req.variable;
1816 if (pos[0] != WLAN_EID_SSID ||
1817 pos + 2 + pos[1] > end) {
1818 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1819 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1820 "from %pM\n",
1821 sdata->dev->name, mgmt->sa);
1822 #endif
1823 return;
1824 }
1825 if (pos[1] != 0 &&
1826 (pos[1] != ifsta->ssid_len ||
1827 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1828 /* Ignore ProbeReq for foreign SSID */
1829 return;
1830 }
1831
1832 /* Reply with ProbeResp */
1833 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1834 if (!skb)
1835 return;
1836
1837 resp = (struct ieee80211_mgmt *) skb->data;
1838 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1839 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1840 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1841 sdata->dev->name, resp->da);
1842 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1843 ieee80211_tx_skb(sdata, skb, 0);
1844 }
1845
1846 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1847 struct ieee80211_rx_status *rx_status)
1848 {
1849 struct ieee80211_local *local = sdata->local;
1850 struct ieee80211_if_sta *ifsta;
1851 struct ieee80211_mgmt *mgmt;
1852 u16 fc;
1853
1854 if (skb->len < 24)
1855 goto fail;
1856
1857 ifsta = &sdata->u.sta;
1858
1859 mgmt = (struct ieee80211_mgmt *) skb->data;
1860 fc = le16_to_cpu(mgmt->frame_control);
1861
1862 switch (fc & IEEE80211_FCTL_STYPE) {
1863 case IEEE80211_STYPE_PROBE_REQ:
1864 case IEEE80211_STYPE_PROBE_RESP:
1865 case IEEE80211_STYPE_BEACON:
1866 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1867 case IEEE80211_STYPE_AUTH:
1868 case IEEE80211_STYPE_ASSOC_RESP:
1869 case IEEE80211_STYPE_REASSOC_RESP:
1870 case IEEE80211_STYPE_DEAUTH:
1871 case IEEE80211_STYPE_DISASSOC:
1872 skb_queue_tail(&ifsta->skb_queue, skb);
1873 queue_work(local->hw.workqueue, &ifsta->work);
1874 return;
1875 }
1876
1877 fail:
1878 kfree_skb(skb);
1879 }
1880
1881 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1882 struct sk_buff *skb)
1883 {
1884 struct ieee80211_rx_status *rx_status;
1885 struct ieee80211_if_sta *ifsta;
1886 struct ieee80211_mgmt *mgmt;
1887 u16 fc;
1888
1889 ifsta = &sdata->u.sta;
1890
1891 rx_status = (struct ieee80211_rx_status *) skb->cb;
1892 mgmt = (struct ieee80211_mgmt *) skb->data;
1893 fc = le16_to_cpu(mgmt->frame_control);
1894
1895 switch (fc & IEEE80211_FCTL_STYPE) {
1896 case IEEE80211_STYPE_PROBE_REQ:
1897 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1898 rx_status);
1899 break;
1900 case IEEE80211_STYPE_PROBE_RESP:
1901 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1902 break;
1903 case IEEE80211_STYPE_BEACON:
1904 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1905 break;
1906 case IEEE80211_STYPE_AUTH:
1907 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1908 break;
1909 case IEEE80211_STYPE_ASSOC_RESP:
1910 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1911 break;
1912 case IEEE80211_STYPE_REASSOC_RESP:
1913 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1914 break;
1915 case IEEE80211_STYPE_DEAUTH:
1916 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1917 break;
1918 case IEEE80211_STYPE_DISASSOC:
1919 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1920 break;
1921 }
1922
1923 kfree_skb(skb);
1924 }
1925
1926
1927 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1928 {
1929 struct ieee80211_local *local = sdata->local;
1930 int active = 0;
1931 struct sta_info *sta;
1932
1933 rcu_read_lock();
1934
1935 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1936 if (sta->sdata == sdata &&
1937 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1938 jiffies)) {
1939 active++;
1940 break;
1941 }
1942 }
1943
1944 rcu_read_unlock();
1945
1946 return active;
1947 }
1948
1949
1950 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
1951 struct ieee80211_if_sta *ifsta)
1952 {
1953 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1954
1955 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
1956 if (ieee80211_sta_active_ibss(sdata))
1957 return;
1958
1959 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1960 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
1961 ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
1962 }
1963
1964
1965 static void ieee80211_sta_timer(unsigned long data)
1966 {
1967 struct ieee80211_sub_if_data *sdata =
1968 (struct ieee80211_sub_if_data *) data;
1969 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1970 struct ieee80211_local *local = sdata->local;
1971
1972 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1973 queue_work(local->hw.workqueue, &ifsta->work);
1974 }
1975
1976 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
1977 struct ieee80211_if_sta *ifsta)
1978 {
1979 struct ieee80211_local *local = sdata->local;
1980
1981 if (local->ops->reset_tsf) {
1982 /* Reset own TSF to allow time synchronization work. */
1983 local->ops->reset_tsf(local_to_hw(local));
1984 }
1985
1986 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1987
1988
1989 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1990 ifsta->auth_alg = WLAN_AUTH_OPEN;
1991 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1992 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
1993 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1994 ifsta->auth_alg = WLAN_AUTH_LEAP;
1995 else
1996 ifsta->auth_alg = WLAN_AUTH_OPEN;
1997 ifsta->auth_transaction = -1;
1998 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
1999 ifsta->assoc_scan_tries = 0;
2000 ifsta->direct_probe_tries = 0;
2001 ifsta->auth_tries = 0;
2002 ifsta->assoc_tries = 0;
2003 netif_tx_stop_all_queues(sdata->dev);
2004 netif_carrier_off(sdata->dev);
2005 }
2006
2007
2008 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2009 const char *ssid, int ssid_len)
2010 {
2011 int tmp, hidden_ssid;
2012
2013 if (ssid_len == ifsta->ssid_len &&
2014 !memcmp(ifsta->ssid, ssid, ssid_len))
2015 return 1;
2016
2017 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2018 return 0;
2019
2020 hidden_ssid = 1;
2021 tmp = ssid_len;
2022 while (tmp--) {
2023 if (ssid[tmp] != '\0') {
2024 hidden_ssid = 0;
2025 break;
2026 }
2027 }
2028
2029 if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2030 return 1;
2031
2032 if (ssid_len == 1 && ssid[0] == ' ')
2033 return 1;
2034
2035 return 0;
2036 }
2037
2038 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2039 struct ieee80211_if_sta *ifsta)
2040 {
2041 struct ieee80211_local *local = sdata->local;
2042 struct ieee80211_bss *bss;
2043 struct ieee80211_supported_band *sband;
2044 u8 bssid[ETH_ALEN], *pos;
2045 int i;
2046 int ret;
2047
2048 #if 0
2049 /* Easier testing, use fixed BSSID. */
2050 memset(bssid, 0xfe, ETH_ALEN);
2051 #else
2052 /* Generate random, not broadcast, locally administered BSSID. Mix in
2053 * own MAC address to make sure that devices that do not have proper
2054 * random number generator get different BSSID. */
2055 get_random_bytes(bssid, ETH_ALEN);
2056 for (i = 0; i < ETH_ALEN; i++)
2057 bssid[i] ^= sdata->dev->dev_addr[i];
2058 bssid[0] &= ~0x01;
2059 bssid[0] |= 0x02;
2060 #endif
2061
2062 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2063 sdata->dev->name, bssid);
2064
2065 bss = ieee80211_rx_bss_add(local, bssid,
2066 local->hw.conf.channel->center_freq,
2067 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2068 if (!bss)
2069 return -ENOMEM;
2070
2071 bss->band = local->hw.conf.channel->band;
2072 sband = local->hw.wiphy->bands[bss->band];
2073
2074 if (local->hw.conf.beacon_int == 0)
2075 local->hw.conf.beacon_int = 100;
2076 bss->beacon_int = local->hw.conf.beacon_int;
2077 bss->last_update = jiffies;
2078 bss->capability = WLAN_CAPABILITY_IBSS;
2079
2080 if (sdata->default_key)
2081 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2082 else
2083 sdata->drop_unencrypted = 0;
2084
2085 bss->supp_rates_len = sband->n_bitrates;
2086 pos = bss->supp_rates;
2087 for (i = 0; i < sband->n_bitrates; i++) {
2088 int rate = sband->bitrates[i].bitrate;
2089 *pos++ = (u8) (rate / 5);
2090 }
2091
2092 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2093 ieee80211_rx_bss_put(local, bss);
2094 return ret;
2095 }
2096
2097
2098 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2099 struct ieee80211_if_sta *ifsta)
2100 {
2101 struct ieee80211_local *local = sdata->local;
2102 struct ieee80211_bss *bss;
2103 int found = 0;
2104 u8 bssid[ETH_ALEN];
2105 int active_ibss;
2106
2107 if (ifsta->ssid_len == 0)
2108 return -EINVAL;
2109
2110 active_ibss = ieee80211_sta_active_ibss(sdata);
2111 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2112 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2113 sdata->dev->name, active_ibss);
2114 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2115 spin_lock_bh(&local->bss_lock);
2116 list_for_each_entry(bss, &local->bss_list, list) {
2117 if (ifsta->ssid_len != bss->ssid_len ||
2118 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2119 || !(bss->capability & WLAN_CAPABILITY_IBSS))
2120 continue;
2121 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2122 printk(KERN_DEBUG " bssid=%pM found\n", bss->bssid);
2123 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2124 memcpy(bssid, bss->bssid, ETH_ALEN);
2125 found = 1;
2126 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2127 break;
2128 }
2129 spin_unlock_bh(&local->bss_lock);
2130
2131 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2132 if (found)
2133 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
2134 "%pM\n", bssid, ifsta->bssid);
2135 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2136
2137 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2138 int ret;
2139 int search_freq;
2140
2141 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2142 search_freq = bss->freq;
2143 else
2144 search_freq = local->hw.conf.channel->center_freq;
2145
2146 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2147 ifsta->ssid, ifsta->ssid_len);
2148 if (!bss)
2149 goto dont_join;
2150
2151 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2152 " based on configured SSID\n",
2153 sdata->dev->name, bssid);
2154 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2155 ieee80211_rx_bss_put(local, bss);
2156 return ret;
2157 }
2158
2159 dont_join:
2160 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2161 printk(KERN_DEBUG " did not try to join ibss\n");
2162 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2163
2164 /* Selected IBSS not found in current scan results - try to scan */
2165 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2166 !ieee80211_sta_active_ibss(sdata)) {
2167 mod_timer(&ifsta->timer, jiffies +
2168 IEEE80211_IBSS_MERGE_INTERVAL);
2169 } else if (time_after(jiffies, local->last_scan_completed +
2170 IEEE80211_SCAN_INTERVAL)) {
2171 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2172 "join\n", sdata->dev->name);
2173 return ieee80211_request_scan(sdata, ifsta->ssid,
2174 ifsta->ssid_len);
2175 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2176 int interval = IEEE80211_SCAN_INTERVAL;
2177
2178 if (time_after(jiffies, ifsta->ibss_join_req +
2179 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2180 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2181 (!(local->oper_channel->flags &
2182 IEEE80211_CHAN_NO_IBSS)))
2183 return ieee80211_sta_create_ibss(sdata, ifsta);
2184 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2185 printk(KERN_DEBUG "%s: IBSS not allowed on"
2186 " %d MHz\n", sdata->dev->name,
2187 local->hw.conf.channel->center_freq);
2188 }
2189
2190 /* No IBSS found - decrease scan interval and continue
2191 * scanning. */
2192 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2193 }
2194
2195 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2196 mod_timer(&ifsta->timer, jiffies + interval);
2197 return 0;
2198 }
2199
2200 return 0;
2201 }
2202
2203
2204 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2205 struct ieee80211_if_sta *ifsta)
2206 {
2207 struct ieee80211_local *local = sdata->local;
2208 struct ieee80211_bss *bss, *selected = NULL;
2209 int top_rssi = 0, freq;
2210
2211 spin_lock_bh(&local->bss_lock);
2212 freq = local->oper_channel->center_freq;
2213 list_for_each_entry(bss, &local->bss_list, list) {
2214 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2215 continue;
2216
2217 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2218 IEEE80211_STA_AUTO_BSSID_SEL |
2219 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2220 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2221 !!sdata->default_key))
2222 continue;
2223
2224 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2225 bss->freq != freq)
2226 continue;
2227
2228 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2229 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2230 continue;
2231
2232 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2233 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2234 continue;
2235
2236 if (!selected || top_rssi < bss->signal) {
2237 selected = bss;
2238 top_rssi = bss->signal;
2239 }
2240 }
2241 if (selected)
2242 atomic_inc(&selected->users);
2243 spin_unlock_bh(&local->bss_lock);
2244
2245 if (selected) {
2246 ieee80211_set_freq(sdata, selected->freq);
2247 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2248 ieee80211_sta_set_ssid(sdata, selected->ssid,
2249 selected->ssid_len);
2250 ieee80211_sta_set_bssid(sdata, selected->bssid);
2251 ieee80211_sta_def_wmm_params(sdata, selected);
2252
2253 /* Send out direct probe if no probe resp was received or
2254 * the one we have is outdated
2255 */
2256 if (!selected->last_probe_resp ||
2257 time_after(jiffies, selected->last_probe_resp
2258 + IEEE80211_SCAN_RESULT_EXPIRE))
2259 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2260 else
2261 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2262
2263 ieee80211_rx_bss_put(local, selected);
2264 ieee80211_sta_reset_auth(sdata, ifsta);
2265 return 0;
2266 } else {
2267 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2268 ifsta->assoc_scan_tries++;
2269 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2270 ieee80211_start_scan(sdata, NULL, 0);
2271 else
2272 ieee80211_start_scan(sdata, ifsta->ssid,
2273 ifsta->ssid_len);
2274 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2275 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2276 } else
2277 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2278 }
2279 return -1;
2280 }
2281
2282
2283 static void ieee80211_sta_work(struct work_struct *work)
2284 {
2285 struct ieee80211_sub_if_data *sdata =
2286 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2287 struct ieee80211_local *local = sdata->local;
2288 struct ieee80211_if_sta *ifsta;
2289 struct sk_buff *skb;
2290
2291 if (!netif_running(sdata->dev))
2292 return;
2293
2294 if (local->sw_scanning || local->hw_scanning)
2295 return;
2296
2297 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2298 sdata->vif.type != NL80211_IFTYPE_ADHOC))
2299 return;
2300 ifsta = &sdata->u.sta;
2301
2302 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2303 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2304
2305 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2306 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2307 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2308 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2309 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2310 ifsta->scan_ssid_len);
2311 return;
2312 }
2313
2314 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2315 if (ieee80211_sta_config_auth(sdata, ifsta))
2316 return;
2317 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2318 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2319 return;
2320
2321 switch (ifsta->state) {
2322 case IEEE80211_STA_MLME_DISABLED:
2323 break;
2324 case IEEE80211_STA_MLME_DIRECT_PROBE:
2325 ieee80211_direct_probe(sdata, ifsta);
2326 break;
2327 case IEEE80211_STA_MLME_AUTHENTICATE:
2328 ieee80211_authenticate(sdata, ifsta);
2329 break;
2330 case IEEE80211_STA_MLME_ASSOCIATE:
2331 ieee80211_associate(sdata, ifsta);
2332 break;
2333 case IEEE80211_STA_MLME_ASSOCIATED:
2334 ieee80211_associated(sdata, ifsta);
2335 break;
2336 case IEEE80211_STA_MLME_IBSS_SEARCH:
2337 ieee80211_sta_find_ibss(sdata, ifsta);
2338 break;
2339 case IEEE80211_STA_MLME_IBSS_JOINED:
2340 ieee80211_sta_merge_ibss(sdata, ifsta);
2341 break;
2342 default:
2343 WARN_ON(1);
2344 break;
2345 }
2346
2347 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2348 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2349 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2350
2351 ieee80211_set_disassoc(sdata, ifsta, false, true,
2352 WLAN_REASON_UNSPECIFIED);
2353 }
2354 }
2355
2356 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2357 {
2358 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2359 queue_work(sdata->local->hw.workqueue,
2360 &sdata->u.sta.work);
2361 }
2362
2363 /* interface setup */
2364 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2365 {
2366 struct ieee80211_if_sta *ifsta;
2367
2368 ifsta = &sdata->u.sta;
2369 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2370 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2371 (unsigned long) sdata);
2372 skb_queue_head_init(&ifsta->skb_queue);
2373
2374 ifsta->capab = WLAN_CAPABILITY_ESS;
2375 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2376 IEEE80211_AUTH_ALG_SHARED_KEY;
2377 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2378 IEEE80211_STA_AUTO_BSSID_SEL |
2379 IEEE80211_STA_AUTO_CHANNEL_SEL;
2380 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2381 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2382 }
2383
2384 /*
2385 * Add a new IBSS station, will also be called by the RX code when,
2386 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2387 * must be callable in atomic context.
2388 */
2389 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2390 u8 *bssid,u8 *addr, u64 supp_rates)
2391 {
2392 struct ieee80211_local *local = sdata->local;
2393 struct sta_info *sta;
2394 int band = local->hw.conf.channel->band;
2395
2396 /* TODO: Could consider removing the least recently used entry and
2397 * allow new one to be added. */
2398 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2399 if (net_ratelimit()) {
2400 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2401 "entry %pM\n", sdata->dev->name, addr);
2402 }
2403 return NULL;
2404 }
2405
2406 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2407 return NULL;
2408
2409 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2410 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2411 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2412 #endif
2413
2414 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2415 if (!sta)
2416 return NULL;
2417
2418 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2419
2420 /* make sure mandatory rates are always added */
2421 sta->sta.supp_rates[band] = supp_rates |
2422 ieee80211_mandatory_rates(local, band);
2423
2424 rate_control_rate_init(sta);
2425
2426 if (sta_info_insert(sta))
2427 return NULL;
2428
2429 return sta;
2430 }
2431
2432 /* configuration hooks */
2433 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2434 struct ieee80211_if_sta *ifsta)
2435 {
2436 struct ieee80211_local *local = sdata->local;
2437
2438 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2439 return;
2440
2441 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2442 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2443 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2444 IEEE80211_STA_AUTO_SSID_SEL))) {
2445
2446 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2447 ieee80211_set_disassoc(sdata, ifsta, true, true,
2448 WLAN_REASON_DEAUTH_LEAVING);
2449
2450 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2451 queue_work(local->hw.workqueue, &ifsta->work);
2452 }
2453 }
2454
2455 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2456 {
2457 struct ieee80211_if_sta *ifsta;
2458
2459 if (len > IEEE80211_MAX_SSID_LEN)
2460 return -EINVAL;
2461
2462 ifsta = &sdata->u.sta;
2463
2464 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2465 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2466 memcpy(ifsta->ssid, ssid, len);
2467 ifsta->ssid_len = len;
2468 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2469 }
2470
2471 if (len)
2472 ifsta->flags |= IEEE80211_STA_SSID_SET;
2473 else
2474 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2475
2476 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2477 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2478 ifsta->ibss_join_req = jiffies;
2479 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2480 return ieee80211_sta_find_ibss(sdata, ifsta);
2481 }
2482
2483 return 0;
2484 }
2485
2486 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2487 {
2488 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2489 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2490 *len = ifsta->ssid_len;
2491 return 0;
2492 }
2493
2494 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2495 {
2496 struct ieee80211_if_sta *ifsta;
2497 int res;
2498
2499 ifsta = &sdata->u.sta;
2500
2501 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2502 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2503 res = 0;
2504 /*
2505 * Hack! See also ieee80211_sta_set_ssid.
2506 */
2507 if (netif_running(sdata->dev))
2508 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2509 if (res) {
2510 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2511 "the low-level driver\n", sdata->dev->name);
2512 return res;
2513 }
2514 }
2515
2516 if (is_valid_ether_addr(bssid))
2517 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2518 else
2519 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2520
2521 return 0;
2522 }
2523
2524 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2525 {
2526 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2527
2528 kfree(ifsta->extra_ie);
2529 if (len == 0) {
2530 ifsta->extra_ie = NULL;
2531 ifsta->extra_ie_len = 0;
2532 return 0;
2533 }
2534 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2535 if (!ifsta->extra_ie) {
2536 ifsta->extra_ie_len = 0;
2537 return -ENOMEM;
2538 }
2539 memcpy(ifsta->extra_ie, ie, len);
2540 ifsta->extra_ie_len = len;
2541 return 0;
2542 }
2543
2544 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2545 {
2546 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2547
2548 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2549 sdata->dev->name, reason);
2550
2551 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2552 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2553 return -EINVAL;
2554
2555 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2556 return 0;
2557 }
2558
2559 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2560 {
2561 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2562
2563 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2564 sdata->dev->name, reason);
2565
2566 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2567 return -EINVAL;
2568
2569 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2570 return -1;
2571
2572 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2573 return 0;
2574 }
2575
2576 /* scan finished notification */
2577 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2578 {
2579 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2580 struct ieee80211_if_sta *ifsta;
2581
2582 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2583 ifsta = &sdata->u.sta;
2584 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2585 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2586 !ieee80211_sta_active_ibss(sdata)))
2587 ieee80211_sta_find_ibss(sdata, ifsta);
2588 }
2589
2590 /* Restart STA timers */
2591 rcu_read_lock();
2592 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2593 ieee80211_restart_sta_timer(sdata);
2594 rcu_read_unlock();
2595 }
Linux kernel - Deliverables
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