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mac80211: rewrite HT handling
[mirror_ubuntu-zesty-kernel.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/netdevice.h>
18 #include <linux/if_arp.h>
19 #include <linux/wireless.h>
20 #include <linux/random.h>
21 #include <linux/etherdevice.h>
22 #include <linux/rtnetlink.h>
23 #include <net/iw_handler.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
26
27 #include "ieee80211_i.h"
28 #include "rate.h"
29 #include "led.h"
30
31 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
32 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
33 #define IEEE80211_AUTH_MAX_TRIES 3
34 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
35 #define IEEE80211_ASSOC_MAX_TRIES 3
36 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
37 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
38 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
39 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
40 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
41 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
42
43 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
44 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
45
46 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
47
48
49 /* utils */
50 static int ecw2cw(int ecw)
51 {
52 return (1 << ecw) - 1;
53 }
54
55 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
56 {
57 u8 *end, *pos;
58
59 pos = bss->ies;
60 if (pos == NULL)
61 return NULL;
62 end = pos + bss->ies_len;
63
64 while (pos + 1 < end) {
65 if (pos + 2 + pos[1] > end)
66 break;
67 if (pos[0] == ie)
68 return pos;
69 pos += 2 + pos[1];
70 }
71
72 return NULL;
73 }
74
75 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
76 struct ieee80211_supported_band *sband,
77 u64 *rates)
78 {
79 int i, j, count;
80 *rates = 0;
81 count = 0;
82 for (i = 0; i < bss->supp_rates_len; i++) {
83 int rate = (bss->supp_rates[i] & 0x7F) * 5;
84
85 for (j = 0; j < sband->n_bitrates; j++)
86 if (sband->bitrates[j].bitrate == rate) {
87 *rates |= BIT(j);
88 count++;
89 break;
90 }
91 }
92
93 return count;
94 }
95
96 /* also used by mesh code */
97 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
98 struct ieee802_11_elems *elems,
99 enum ieee80211_band band)
100 {
101 struct ieee80211_supported_band *sband;
102 struct ieee80211_rate *bitrates;
103 size_t num_rates;
104 u64 supp_rates;
105 int i, j;
106 sband = local->hw.wiphy->bands[band];
107
108 if (!sband) {
109 WARN_ON(1);
110 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
111 }
112
113 bitrates = sband->bitrates;
114 num_rates = sband->n_bitrates;
115 supp_rates = 0;
116 for (i = 0; i < elems->supp_rates_len +
117 elems->ext_supp_rates_len; i++) {
118 u8 rate = 0;
119 int own_rate;
120 if (i < elems->supp_rates_len)
121 rate = elems->supp_rates[i];
122 else if (elems->ext_supp_rates)
123 rate = elems->ext_supp_rates
124 [i - elems->supp_rates_len];
125 own_rate = 5 * (rate & 0x7f);
126 for (j = 0; j < num_rates; j++)
127 if (bitrates[j].bitrate == own_rate)
128 supp_rates |= BIT(j);
129 }
130 return supp_rates;
131 }
132
133 /* frame sending functions */
134
135 /* also used by scanning code */
136 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
137 u8 *ssid, size_t ssid_len)
138 {
139 struct ieee80211_local *local = sdata->local;
140 struct ieee80211_supported_band *sband;
141 struct sk_buff *skb;
142 struct ieee80211_mgmt *mgmt;
143 u8 *pos, *supp_rates, *esupp_rates = NULL;
144 int i;
145
146 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
147 if (!skb) {
148 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
149 "request\n", sdata->dev->name);
150 return;
151 }
152 skb_reserve(skb, local->hw.extra_tx_headroom);
153
154 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
155 memset(mgmt, 0, 24);
156 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
157 IEEE80211_STYPE_PROBE_REQ);
158 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
159 if (dst) {
160 memcpy(mgmt->da, dst, ETH_ALEN);
161 memcpy(mgmt->bssid, dst, ETH_ALEN);
162 } else {
163 memset(mgmt->da, 0xff, ETH_ALEN);
164 memset(mgmt->bssid, 0xff, ETH_ALEN);
165 }
166 pos = skb_put(skb, 2 + ssid_len);
167 *pos++ = WLAN_EID_SSID;
168 *pos++ = ssid_len;
169 memcpy(pos, ssid, ssid_len);
170
171 supp_rates = skb_put(skb, 2);
172 supp_rates[0] = WLAN_EID_SUPP_RATES;
173 supp_rates[1] = 0;
174 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
175
176 for (i = 0; i < sband->n_bitrates; i++) {
177 struct ieee80211_rate *rate = &sband->bitrates[i];
178 if (esupp_rates) {
179 pos = skb_put(skb, 1);
180 esupp_rates[1]++;
181 } else if (supp_rates[1] == 8) {
182 esupp_rates = skb_put(skb, 3);
183 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
184 esupp_rates[1] = 1;
185 pos = &esupp_rates[2];
186 } else {
187 pos = skb_put(skb, 1);
188 supp_rates[1]++;
189 }
190 *pos = rate->bitrate / 5;
191 }
192
193 ieee80211_tx_skb(sdata, skb, 0);
194 }
195
196 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
197 struct ieee80211_if_sta *ifsta,
198 int transaction, u8 *extra, size_t extra_len,
199 int encrypt)
200 {
201 struct ieee80211_local *local = sdata->local;
202 struct sk_buff *skb;
203 struct ieee80211_mgmt *mgmt;
204
205 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
206 sizeof(*mgmt) + 6 + extra_len);
207 if (!skb) {
208 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
209 "frame\n", sdata->dev->name);
210 return;
211 }
212 skb_reserve(skb, local->hw.extra_tx_headroom);
213
214 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
215 memset(mgmt, 0, 24 + 6);
216 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
217 IEEE80211_STYPE_AUTH);
218 if (encrypt)
219 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
220 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
221 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
222 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
223 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
224 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
225 ifsta->auth_transaction = transaction + 1;
226 mgmt->u.auth.status_code = cpu_to_le16(0);
227 if (extra)
228 memcpy(skb_put(skb, extra_len), extra, extra_len);
229
230 ieee80211_tx_skb(sdata, skb, encrypt);
231 }
232
233 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
234 struct ieee80211_if_sta *ifsta)
235 {
236 struct ieee80211_local *local = sdata->local;
237 struct sk_buff *skb;
238 struct ieee80211_mgmt *mgmt;
239 u8 *pos, *ies, *ht_ie;
240 int i, len, count, rates_len, supp_rates_len;
241 u16 capab;
242 struct ieee80211_bss *bss;
243 int wmm = 0;
244 struct ieee80211_supported_band *sband;
245 u64 rates = 0;
246
247 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
248 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
249 ifsta->ssid_len);
250 if (!skb) {
251 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
252 "frame\n", sdata->dev->name);
253 return;
254 }
255 skb_reserve(skb, local->hw.extra_tx_headroom);
256
257 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
258
259 capab = ifsta->capab;
260
261 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
262 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
263 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
264 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
265 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
266 }
267
268 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
269 local->hw.conf.channel->center_freq,
270 ifsta->ssid, ifsta->ssid_len);
271 if (bss) {
272 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
273 capab |= WLAN_CAPABILITY_PRIVACY;
274 if (bss->wmm_used)
275 wmm = 1;
276
277 /* get all rates supported by the device and the AP as
278 * some APs don't like getting a superset of their rates
279 * in the association request (e.g. D-Link DAP 1353 in
280 * b-only mode) */
281 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
282
283 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
284 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
285 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
286
287 ieee80211_rx_bss_put(local, bss);
288 } else {
289 rates = ~0;
290 rates_len = sband->n_bitrates;
291 }
292
293 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
294 memset(mgmt, 0, 24);
295 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
296 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
297 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
298
299 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
300 skb_put(skb, 10);
301 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
302 IEEE80211_STYPE_REASSOC_REQ);
303 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
304 mgmt->u.reassoc_req.listen_interval =
305 cpu_to_le16(local->hw.conf.listen_interval);
306 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
307 ETH_ALEN);
308 } else {
309 skb_put(skb, 4);
310 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
311 IEEE80211_STYPE_ASSOC_REQ);
312 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
313 mgmt->u.reassoc_req.listen_interval =
314 cpu_to_le16(local->hw.conf.listen_interval);
315 }
316
317 /* SSID */
318 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
319 *pos++ = WLAN_EID_SSID;
320 *pos++ = ifsta->ssid_len;
321 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
322
323 /* add all rates which were marked to be used above */
324 supp_rates_len = rates_len;
325 if (supp_rates_len > 8)
326 supp_rates_len = 8;
327
328 len = sband->n_bitrates;
329 pos = skb_put(skb, supp_rates_len + 2);
330 *pos++ = WLAN_EID_SUPP_RATES;
331 *pos++ = supp_rates_len;
332
333 count = 0;
334 for (i = 0; i < sband->n_bitrates; i++) {
335 if (BIT(i) & rates) {
336 int rate = sband->bitrates[i].bitrate;
337 *pos++ = (u8) (rate / 5);
338 if (++count == 8)
339 break;
340 }
341 }
342
343 if (rates_len > count) {
344 pos = skb_put(skb, rates_len - count + 2);
345 *pos++ = WLAN_EID_EXT_SUPP_RATES;
346 *pos++ = rates_len - count;
347
348 for (i++; i < sband->n_bitrates; i++) {
349 if (BIT(i) & rates) {
350 int rate = sband->bitrates[i].bitrate;
351 *pos++ = (u8) (rate / 5);
352 }
353 }
354 }
355
356 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
357 /* 1. power capabilities */
358 pos = skb_put(skb, 4);
359 *pos++ = WLAN_EID_PWR_CAPABILITY;
360 *pos++ = 2;
361 *pos++ = 0; /* min tx power */
362 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
363
364 /* 2. supported channels */
365 /* TODO: get this in reg domain format */
366 pos = skb_put(skb, 2 * sband->n_channels + 2);
367 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
368 *pos++ = 2 * sband->n_channels;
369 for (i = 0; i < sband->n_channels; i++) {
370 *pos++ = ieee80211_frequency_to_channel(
371 sband->channels[i].center_freq);
372 *pos++ = 1; /* one channel in the subband*/
373 }
374 }
375
376 if (ifsta->extra_ie) {
377 pos = skb_put(skb, ifsta->extra_ie_len);
378 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
379 }
380
381 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
382 pos = skb_put(skb, 9);
383 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
384 *pos++ = 7; /* len */
385 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
386 *pos++ = 0x50;
387 *pos++ = 0xf2;
388 *pos++ = 2; /* WME */
389 *pos++ = 0; /* WME info */
390 *pos++ = 1; /* WME ver */
391 *pos++ = 0;
392 }
393
394 /* wmm support is a must to HT */
395 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
396 sband->ht_cap.ht_supported &&
397 (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
398 ht_ie[1] >= sizeof(struct ieee80211_ht_info)) {
399 struct ieee80211_ht_info *ht_info =
400 (struct ieee80211_ht_info *)(ht_ie + 2);
401 u16 cap = sband->ht_cap.cap;
402 __le16 tmp;
403 u32 flags = local->hw.conf.channel->flags;
404
405 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
406 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
407 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
408 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
409 cap &= ~IEEE80211_HT_CAP_SGI_40;
410 }
411 break;
412 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
413 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
414 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
415 cap &= ~IEEE80211_HT_CAP_SGI_40;
416 }
417 break;
418 }
419
420 tmp = cpu_to_le16(cap);
421 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
422 *pos++ = WLAN_EID_HT_CAPABILITY;
423 *pos++ = sizeof(struct ieee80211_ht_cap);
424 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
425 memcpy(pos, &tmp, sizeof(u16));
426 pos += sizeof(u16);
427 /* TODO: needs a define here for << 2 */
428 *pos++ = sband->ht_cap.ampdu_factor |
429 (sband->ht_cap.ampdu_density << 2);
430 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
431 }
432
433 kfree(ifsta->assocreq_ies);
434 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
435 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
436 if (ifsta->assocreq_ies)
437 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
438
439 ieee80211_tx_skb(sdata, skb, 0);
440 }
441
442
443 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
444 u16 stype, u16 reason)
445 {
446 struct ieee80211_local *local = sdata->local;
447 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
448 struct sk_buff *skb;
449 struct ieee80211_mgmt *mgmt;
450
451 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
452 if (!skb) {
453 printk(KERN_DEBUG "%s: failed to allocate buffer for "
454 "deauth/disassoc frame\n", sdata->dev->name);
455 return;
456 }
457 skb_reserve(skb, local->hw.extra_tx_headroom);
458
459 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
460 memset(mgmt, 0, 24);
461 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
462 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
463 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
464 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
465 skb_put(skb, 2);
466 /* u.deauth.reason_code == u.disassoc.reason_code */
467 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
468
469 ieee80211_tx_skb(sdata, skb, 0);
470 }
471
472 /* MLME */
473 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
474 struct ieee80211_bss *bss)
475 {
476 struct ieee80211_local *local = sdata->local;
477 int i, have_higher_than_11mbit = 0;
478
479 /* cf. IEEE 802.11 9.2.12 */
480 for (i = 0; i < bss->supp_rates_len; i++)
481 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
482 have_higher_than_11mbit = 1;
483
484 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
485 have_higher_than_11mbit)
486 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
487 else
488 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
489
490 ieee80211_set_wmm_default(sdata);
491 }
492
493 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
494 struct ieee80211_if_sta *ifsta,
495 u8 *wmm_param, size_t wmm_param_len)
496 {
497 struct ieee80211_tx_queue_params params;
498 size_t left;
499 int count;
500 u8 *pos;
501
502 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
503 return;
504
505 if (!wmm_param)
506 return;
507
508 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
509 return;
510 count = wmm_param[6] & 0x0f;
511 if (count == ifsta->wmm_last_param_set)
512 return;
513 ifsta->wmm_last_param_set = count;
514
515 pos = wmm_param + 8;
516 left = wmm_param_len - 8;
517
518 memset(&params, 0, sizeof(params));
519
520 if (!local->ops->conf_tx)
521 return;
522
523 local->wmm_acm = 0;
524 for (; left >= 4; left -= 4, pos += 4) {
525 int aci = (pos[0] >> 5) & 0x03;
526 int acm = (pos[0] >> 4) & 0x01;
527 int queue;
528
529 switch (aci) {
530 case 1:
531 queue = 3;
532 if (acm)
533 local->wmm_acm |= BIT(0) | BIT(3);
534 break;
535 case 2:
536 queue = 1;
537 if (acm)
538 local->wmm_acm |= BIT(4) | BIT(5);
539 break;
540 case 3:
541 queue = 0;
542 if (acm)
543 local->wmm_acm |= BIT(6) | BIT(7);
544 break;
545 case 0:
546 default:
547 queue = 2;
548 if (acm)
549 local->wmm_acm |= BIT(1) | BIT(2);
550 break;
551 }
552
553 params.aifs = pos[0] & 0x0f;
554 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
555 params.cw_min = ecw2cw(pos[1] & 0x0f);
556 params.txop = get_unaligned_le16(pos + 2);
557 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
558 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
559 "cWmin=%d cWmax=%d txop=%d\n",
560 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
561 params.cw_max, params.txop);
562 #endif
563 /* TODO: handle ACM (block TX, fallback to next lowest allowed
564 * AC for now) */
565 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
566 printk(KERN_DEBUG "%s: failed to set TX queue "
567 "parameters for queue %d\n", local->mdev->name, queue);
568 }
569 }
570 }
571
572 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
573 u16 capab, bool erp_valid, u8 erp)
574 {
575 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
576 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
577 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
578 #endif
579 u32 changed = 0;
580 bool use_protection;
581 bool use_short_preamble;
582 bool use_short_slot;
583
584 if (erp_valid) {
585 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
586 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
587 } else {
588 use_protection = false;
589 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
590 }
591
592 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
593
594 if (use_protection != bss_conf->use_cts_prot) {
595 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
596 if (net_ratelimit()) {
597 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
598 sdata->dev->name,
599 use_protection ? "enabled" : "disabled",
600 ifsta->bssid);
601 }
602 #endif
603 bss_conf->use_cts_prot = use_protection;
604 changed |= BSS_CHANGED_ERP_CTS_PROT;
605 }
606
607 if (use_short_preamble != bss_conf->use_short_preamble) {
608 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
609 if (net_ratelimit()) {
610 printk(KERN_DEBUG "%s: switched to %s barker preamble"
611 " (BSSID=%pM)\n",
612 sdata->dev->name,
613 use_short_preamble ? "short" : "long",
614 ifsta->bssid);
615 }
616 #endif
617 bss_conf->use_short_preamble = use_short_preamble;
618 changed |= BSS_CHANGED_ERP_PREAMBLE;
619 }
620
621 if (use_short_slot != bss_conf->use_short_slot) {
622 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
623 if (net_ratelimit()) {
624 printk(KERN_DEBUG "%s: switched to %s slot"
625 " (BSSID=%s)\n",
626 sdata->dev->name,
627 use_short_slot ? "short" : "long",
628 ifsta->bssid);
629 }
630 #endif
631 bss_conf->use_short_slot = use_short_slot;
632 changed |= BSS_CHANGED_ERP_SLOT;
633 }
634
635 return changed;
636 }
637
638 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
639 struct ieee80211_if_sta *ifsta)
640 {
641 union iwreq_data wrqu;
642 memset(&wrqu, 0, sizeof(wrqu));
643 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
644 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
645 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
646 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
647 }
648
649 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
650 struct ieee80211_if_sta *ifsta)
651 {
652 char *buf;
653 size_t len;
654 int i;
655 union iwreq_data wrqu;
656
657 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
658 return;
659
660 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
661 ifsta->assocresp_ies_len), GFP_KERNEL);
662 if (!buf)
663 return;
664
665 len = sprintf(buf, "ASSOCINFO(");
666 if (ifsta->assocreq_ies) {
667 len += sprintf(buf + len, "ReqIEs=");
668 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
669 len += sprintf(buf + len, "%02x",
670 ifsta->assocreq_ies[i]);
671 }
672 }
673 if (ifsta->assocresp_ies) {
674 if (ifsta->assocreq_ies)
675 len += sprintf(buf + len, " ");
676 len += sprintf(buf + len, "RespIEs=");
677 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
678 len += sprintf(buf + len, "%02x",
679 ifsta->assocresp_ies[i]);
680 }
681 }
682 len += sprintf(buf + len, ")");
683
684 if (len > IW_CUSTOM_MAX) {
685 len = sprintf(buf, "ASSOCRESPIE=");
686 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
687 len += sprintf(buf + len, "%02x",
688 ifsta->assocresp_ies[i]);
689 }
690 }
691
692 if (len <= IW_CUSTOM_MAX) {
693 memset(&wrqu, 0, sizeof(wrqu));
694 wrqu.data.length = len;
695 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
696 }
697
698 kfree(buf);
699 }
700
701
702 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
703 struct ieee80211_if_sta *ifsta,
704 u32 bss_info_changed)
705 {
706 struct ieee80211_local *local = sdata->local;
707 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
708
709 struct ieee80211_bss *bss;
710
711 bss_info_changed |= BSS_CHANGED_ASSOC;
712 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
713
714 if (sdata->vif.type != NL80211_IFTYPE_STATION)
715 return;
716
717 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
718 conf->channel->center_freq,
719 ifsta->ssid, ifsta->ssid_len);
720 if (bss) {
721 /* set timing information */
722 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
723 sdata->vif.bss_conf.timestamp = bss->timestamp;
724 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
725
726 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
727 bss->capability, bss->has_erp_value, bss->erp_value);
728
729 ieee80211_rx_bss_put(local, bss);
730 }
731
732 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
733 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
734 ieee80211_sta_send_associnfo(sdata, ifsta);
735
736 ifsta->last_probe = jiffies;
737 ieee80211_led_assoc(local, 1);
738
739 sdata->vif.bss_conf.assoc = 1;
740 /*
741 * For now just always ask the driver to update the basic rateset
742 * when we have associated, we aren't checking whether it actually
743 * changed or not.
744 */
745 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
746 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
747
748 netif_tx_start_all_queues(sdata->dev);
749 netif_carrier_on(sdata->dev);
750
751 ieee80211_sta_send_apinfo(sdata, ifsta);
752 }
753
754 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
755 struct ieee80211_if_sta *ifsta)
756 {
757 ifsta->direct_probe_tries++;
758 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
759 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
760 sdata->dev->name, ifsta->bssid);
761 ifsta->state = IEEE80211_STA_MLME_DISABLED;
762 return;
763 }
764
765 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
766 sdata->dev->name, ifsta->bssid,
767 ifsta->direct_probe_tries);
768
769 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
770
771 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
772
773 /* Direct probe is sent to broadcast address as some APs
774 * will not answer to direct packet in unassociated state.
775 */
776 ieee80211_send_probe_req(sdata, NULL,
777 ifsta->ssid, ifsta->ssid_len);
778
779 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
780 }
781
782
783 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
784 struct ieee80211_if_sta *ifsta)
785 {
786 ifsta->auth_tries++;
787 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
788 printk(KERN_DEBUG "%s: authentication with AP %pM"
789 " timed out\n",
790 sdata->dev->name, ifsta->bssid);
791 ifsta->state = IEEE80211_STA_MLME_DISABLED;
792 return;
793 }
794
795 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
796 printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
797 sdata->dev->name, ifsta->bssid);
798
799 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
800
801 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
802 }
803
804 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
805 struct ieee80211_if_sta *ifsta, bool deauth,
806 bool self_disconnected, u16 reason)
807 {
808 struct ieee80211_local *local = sdata->local;
809 struct sta_info *sta;
810 u32 changed = 0;
811
812 rcu_read_lock();
813
814 sta = sta_info_get(local, ifsta->bssid);
815 if (!sta) {
816 rcu_read_unlock();
817 return;
818 }
819
820 if (deauth) {
821 ifsta->direct_probe_tries = 0;
822 ifsta->auth_tries = 0;
823 }
824 ifsta->assoc_scan_tries = 0;
825 ifsta->assoc_tries = 0;
826
827 netif_tx_stop_all_queues(sdata->dev);
828 netif_carrier_off(sdata->dev);
829
830 ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
831
832 if (self_disconnected) {
833 if (deauth)
834 ieee80211_send_deauth_disassoc(sdata,
835 IEEE80211_STYPE_DEAUTH, reason);
836 else
837 ieee80211_send_deauth_disassoc(sdata,
838 IEEE80211_STYPE_DISASSOC, reason);
839 }
840
841 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
842 changed |= ieee80211_reset_erp_info(sdata);
843
844 ieee80211_led_assoc(local, 0);
845 changed |= BSS_CHANGED_ASSOC;
846 sdata->vif.bss_conf.assoc = false;
847
848 ieee80211_sta_send_apinfo(sdata, ifsta);
849
850 if (self_disconnected)
851 ifsta->state = IEEE80211_STA_MLME_DISABLED;
852
853 sta_info_unlink(&sta);
854
855 rcu_read_unlock();
856
857 sta_info_destroy(sta);
858
859 local->hw.conf.ht.enabled = false;
860 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_HT);
861
862 ieee80211_bss_info_change_notify(sdata, changed);
863 }
864
865 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
866 {
867 if (!sdata || !sdata->default_key ||
868 sdata->default_key->conf.alg != ALG_WEP)
869 return 0;
870 return 1;
871 }
872
873 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
874 struct ieee80211_if_sta *ifsta)
875 {
876 struct ieee80211_local *local = sdata->local;
877 struct ieee80211_bss *bss;
878 int bss_privacy;
879 int wep_privacy;
880 int privacy_invoked;
881
882 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
883 return 0;
884
885 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
886 local->hw.conf.channel->center_freq,
887 ifsta->ssid, ifsta->ssid_len);
888 if (!bss)
889 return 0;
890
891 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
892 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
893 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
894
895 ieee80211_rx_bss_put(local, bss);
896
897 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
898 return 0;
899
900 return 1;
901 }
902
903 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
904 struct ieee80211_if_sta *ifsta)
905 {
906 ifsta->assoc_tries++;
907 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
908 printk(KERN_DEBUG "%s: association with AP %pM"
909 " timed out\n",
910 sdata->dev->name, ifsta->bssid);
911 ifsta->state = IEEE80211_STA_MLME_DISABLED;
912 return;
913 }
914
915 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
916 printk(KERN_DEBUG "%s: associate with AP %pM\n",
917 sdata->dev->name, ifsta->bssid);
918 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
919 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
920 "mixed-cell disabled - abort association\n", sdata->dev->name);
921 ifsta->state = IEEE80211_STA_MLME_DISABLED;
922 return;
923 }
924
925 ieee80211_send_assoc(sdata, ifsta);
926
927 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
928 }
929
930
931 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
932 struct ieee80211_if_sta *ifsta)
933 {
934 struct ieee80211_local *local = sdata->local;
935 struct sta_info *sta;
936 int disassoc;
937
938 /* TODO: start monitoring current AP signal quality and number of
939 * missed beacons. Scan other channels every now and then and search
940 * for better APs. */
941 /* TODO: remove expired BSSes */
942
943 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
944
945 rcu_read_lock();
946
947 sta = sta_info_get(local, ifsta->bssid);
948 if (!sta) {
949 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
950 sdata->dev->name, ifsta->bssid);
951 disassoc = 1;
952 } else {
953 disassoc = 0;
954 if (time_after(jiffies,
955 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
956 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
957 printk(KERN_DEBUG "%s: No ProbeResp from "
958 "current AP %pM - assume out of "
959 "range\n",
960 sdata->dev->name, ifsta->bssid);
961 disassoc = 1;
962 } else
963 ieee80211_send_probe_req(sdata, ifsta->bssid,
964 ifsta->ssid,
965 ifsta->ssid_len);
966 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
967 } else {
968 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
969 if (time_after(jiffies, ifsta->last_probe +
970 IEEE80211_PROBE_INTERVAL)) {
971 ifsta->last_probe = jiffies;
972 ieee80211_send_probe_req(sdata, ifsta->bssid,
973 ifsta->ssid,
974 ifsta->ssid_len);
975 }
976 }
977 }
978
979 rcu_read_unlock();
980
981 if (disassoc)
982 ieee80211_set_disassoc(sdata, ifsta, true, true,
983 WLAN_REASON_PREV_AUTH_NOT_VALID);
984 else
985 mod_timer(&ifsta->timer, jiffies +
986 IEEE80211_MONITORING_INTERVAL);
987 }
988
989
990 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
991 struct ieee80211_if_sta *ifsta)
992 {
993 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
994 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
995 ieee80211_associate(sdata, ifsta);
996 }
997
998
999 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1000 struct ieee80211_if_sta *ifsta,
1001 struct ieee80211_mgmt *mgmt,
1002 size_t len)
1003 {
1004 u8 *pos;
1005 struct ieee802_11_elems elems;
1006
1007 pos = mgmt->u.auth.variable;
1008 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1009 if (!elems.challenge)
1010 return;
1011 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1012 elems.challenge_len + 2, 1);
1013 }
1014
1015 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1016 struct ieee80211_if_sta *ifsta,
1017 struct ieee80211_mgmt *mgmt,
1018 size_t len)
1019 {
1020 u16 auth_alg, auth_transaction, status_code;
1021
1022 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1023 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1024 return;
1025
1026 if (len < 24 + 6)
1027 return;
1028
1029 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1030 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1031 return;
1032
1033 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1034 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1035 return;
1036
1037 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1038 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1039 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1040
1041 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1042 /*
1043 * IEEE 802.11 standard does not require authentication in IBSS
1044 * networks and most implementations do not seem to use it.
1045 * However, try to reply to authentication attempts if someone
1046 * has actually implemented this.
1047 */
1048 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1049 return;
1050 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1051 }
1052
1053 if (auth_alg != ifsta->auth_alg ||
1054 auth_transaction != ifsta->auth_transaction)
1055 return;
1056
1057 if (status_code != WLAN_STATUS_SUCCESS) {
1058 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1059 u8 algs[3];
1060 const int num_algs = ARRAY_SIZE(algs);
1061 int i, pos;
1062 algs[0] = algs[1] = algs[2] = 0xff;
1063 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1064 algs[0] = WLAN_AUTH_OPEN;
1065 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1066 algs[1] = WLAN_AUTH_SHARED_KEY;
1067 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1068 algs[2] = WLAN_AUTH_LEAP;
1069 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1070 pos = 0;
1071 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1072 pos = 1;
1073 else
1074 pos = 2;
1075 for (i = 0; i < num_algs; i++) {
1076 pos++;
1077 if (pos >= num_algs)
1078 pos = 0;
1079 if (algs[pos] == ifsta->auth_alg ||
1080 algs[pos] == 0xff)
1081 continue;
1082 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1083 !ieee80211_sta_wep_configured(sdata))
1084 continue;
1085 ifsta->auth_alg = algs[pos];
1086 break;
1087 }
1088 }
1089 return;
1090 }
1091
1092 switch (ifsta->auth_alg) {
1093 case WLAN_AUTH_OPEN:
1094 case WLAN_AUTH_LEAP:
1095 ieee80211_auth_completed(sdata, ifsta);
1096 break;
1097 case WLAN_AUTH_SHARED_KEY:
1098 if (ifsta->auth_transaction == 4)
1099 ieee80211_auth_completed(sdata, ifsta);
1100 else
1101 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1102 break;
1103 }
1104 }
1105
1106
1107 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1108 struct ieee80211_if_sta *ifsta,
1109 struct ieee80211_mgmt *mgmt,
1110 size_t len)
1111 {
1112 u16 reason_code;
1113
1114 if (len < 24 + 2)
1115 return;
1116
1117 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1118 return;
1119
1120 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1121
1122 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1123 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
1124
1125 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1126 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1127 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1128 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1129 mod_timer(&ifsta->timer, jiffies +
1130 IEEE80211_RETRY_AUTH_INTERVAL);
1131 }
1132
1133 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1134 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1135 }
1136
1137
1138 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1139 struct ieee80211_if_sta *ifsta,
1140 struct ieee80211_mgmt *mgmt,
1141 size_t len)
1142 {
1143 u16 reason_code;
1144
1145 if (len < 24 + 2)
1146 return;
1147
1148 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1149 return;
1150
1151 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1152
1153 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1154 printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name);
1155
1156 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1157 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1158 mod_timer(&ifsta->timer, jiffies +
1159 IEEE80211_RETRY_AUTH_INTERVAL);
1160 }
1161
1162 ieee80211_set_disassoc(sdata, ifsta, false, false, 0);
1163 }
1164
1165
1166 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1167 struct ieee80211_if_sta *ifsta,
1168 struct ieee80211_mgmt *mgmt,
1169 size_t len,
1170 int reassoc)
1171 {
1172 struct ieee80211_local *local = sdata->local;
1173 struct ieee80211_supported_band *sband;
1174 struct sta_info *sta;
1175 u64 rates, basic_rates;
1176 u16 capab_info, status_code, aid;
1177 struct ieee802_11_elems elems;
1178 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1179 u8 *pos;
1180 u32 changed = 0;
1181 int i, j;
1182 bool have_higher_than_11mbit = false;
1183 u16 ap_ht_cap_flags;
1184
1185 /* AssocResp and ReassocResp have identical structure, so process both
1186 * of them in this function. */
1187
1188 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1189 return;
1190
1191 if (len < 24 + 6)
1192 return;
1193
1194 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1195 return;
1196
1197 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1198 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1199 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1200
1201 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1202 "status=%d aid=%d)\n",
1203 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1204 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1205
1206 if (status_code != WLAN_STATUS_SUCCESS) {
1207 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1208 sdata->dev->name, status_code);
1209 /* if this was a reassociation, ensure we try a "full"
1210 * association next time. This works around some broken APs
1211 * which do not correctly reject reassociation requests. */
1212 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1213 return;
1214 }
1215
1216 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1217 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1218 "set\n", sdata->dev->name, aid);
1219 aid &= ~(BIT(15) | BIT(14));
1220
1221 pos = mgmt->u.assoc_resp.variable;
1222 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1223
1224 if (!elems.supp_rates) {
1225 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1226 sdata->dev->name);
1227 return;
1228 }
1229
1230 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1231 ifsta->aid = aid;
1232 ifsta->ap_capab = capab_info;
1233
1234 kfree(ifsta->assocresp_ies);
1235 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1236 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1237 if (ifsta->assocresp_ies)
1238 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1239
1240 rcu_read_lock();
1241
1242 /* Add STA entry for the AP */
1243 sta = sta_info_get(local, ifsta->bssid);
1244 if (!sta) {
1245 struct ieee80211_bss *bss;
1246 int err;
1247
1248 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1249 if (!sta) {
1250 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1251 " the AP\n", sdata->dev->name);
1252 rcu_read_unlock();
1253 return;
1254 }
1255 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1256 local->hw.conf.channel->center_freq,
1257 ifsta->ssid, ifsta->ssid_len);
1258 if (bss) {
1259 sta->last_signal = bss->signal;
1260 sta->last_qual = bss->qual;
1261 sta->last_noise = bss->noise;
1262 ieee80211_rx_bss_put(local, bss);
1263 }
1264
1265 err = sta_info_insert(sta);
1266 if (err) {
1267 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1268 " the AP (error %d)\n", sdata->dev->name, err);
1269 rcu_read_unlock();
1270 return;
1271 }
1272 /* update new sta with its last rx activity */
1273 sta->last_rx = jiffies;
1274 }
1275
1276 /*
1277 * FIXME: Do we really need to update the sta_info's information here?
1278 * We already know about the AP (we found it in our list) so it
1279 * should already be filled with the right info, no?
1280 * As is stands, all this is racy because typically we assume
1281 * the information that is filled in here (except flags) doesn't
1282 * change while a STA structure is alive. As such, it should move
1283 * to between the sta_info_alloc() and sta_info_insert() above.
1284 */
1285
1286 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1287 WLAN_STA_AUTHORIZED);
1288
1289 rates = 0;
1290 basic_rates = 0;
1291 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1292
1293 for (i = 0; i < elems.supp_rates_len; i++) {
1294 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1295
1296 if (rate > 110)
1297 have_higher_than_11mbit = true;
1298
1299 for (j = 0; j < sband->n_bitrates; j++) {
1300 if (sband->bitrates[j].bitrate == rate)
1301 rates |= BIT(j);
1302 if (elems.supp_rates[i] & 0x80)
1303 basic_rates |= BIT(j);
1304 }
1305 }
1306
1307 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1308 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1309
1310 if (rate > 110)
1311 have_higher_than_11mbit = true;
1312
1313 for (j = 0; j < sband->n_bitrates; j++) {
1314 if (sband->bitrates[j].bitrate == rate)
1315 rates |= BIT(j);
1316 if (elems.ext_supp_rates[i] & 0x80)
1317 basic_rates |= BIT(j);
1318 }
1319 }
1320
1321 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1322 sdata->vif.bss_conf.basic_rates = basic_rates;
1323
1324 /* cf. IEEE 802.11 9.2.12 */
1325 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1326 have_higher_than_11mbit)
1327 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1328 else
1329 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1330
1331 if (elems.ht_cap_elem)
1332 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1333 elems.ht_cap_elem, &sta->sta.ht_cap);
1334
1335 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1336
1337 rate_control_rate_init(sta);
1338
1339 if (elems.wmm_param) {
1340 set_sta_flags(sta, WLAN_STA_WME);
1341 rcu_read_unlock();
1342 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1343 elems.wmm_param_len);
1344 } else
1345 rcu_read_unlock();
1346
1347 if (elems.ht_info_elem && elems.wmm_param &&
1348 (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1349 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1350 ap_ht_cap_flags);
1351
1352 /* set AID and assoc capability,
1353 * ieee80211_set_associated() will tell the driver */
1354 bss_conf->aid = aid;
1355 bss_conf->assoc_capability = capab_info;
1356 ieee80211_set_associated(sdata, ifsta, changed);
1357
1358 ieee80211_associated(sdata, ifsta);
1359 }
1360
1361
1362 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1363 struct ieee80211_if_sta *ifsta,
1364 struct ieee80211_bss *bss)
1365 {
1366 struct ieee80211_local *local = sdata->local;
1367 int res, rates, i, j;
1368 struct sk_buff *skb;
1369 struct ieee80211_mgmt *mgmt;
1370 u8 *pos;
1371 struct ieee80211_supported_band *sband;
1372 union iwreq_data wrqu;
1373
1374 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1375
1376 /* Remove possible STA entries from other IBSS networks. */
1377 sta_info_flush_delayed(sdata);
1378
1379 if (local->ops->reset_tsf) {
1380 /* Reset own TSF to allow time synchronization work. */
1381 local->ops->reset_tsf(local_to_hw(local));
1382 }
1383 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1384 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1385 if (res)
1386 return res;
1387
1388 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1389
1390 sdata->drop_unencrypted = bss->capability &
1391 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1392
1393 res = ieee80211_set_freq(sdata, bss->freq);
1394
1395 if (res)
1396 return res;
1397
1398 /* Build IBSS probe response */
1399 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1400 if (skb) {
1401 skb_reserve(skb, local->hw.extra_tx_headroom);
1402
1403 mgmt = (struct ieee80211_mgmt *)
1404 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1405 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1406 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1407 IEEE80211_STYPE_PROBE_RESP);
1408 memset(mgmt->da, 0xff, ETH_ALEN);
1409 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1410 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1411 mgmt->u.beacon.beacon_int =
1412 cpu_to_le16(local->hw.conf.beacon_int);
1413 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1414 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1415
1416 pos = skb_put(skb, 2 + ifsta->ssid_len);
1417 *pos++ = WLAN_EID_SSID;
1418 *pos++ = ifsta->ssid_len;
1419 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1420
1421 rates = bss->supp_rates_len;
1422 if (rates > 8)
1423 rates = 8;
1424 pos = skb_put(skb, 2 + rates);
1425 *pos++ = WLAN_EID_SUPP_RATES;
1426 *pos++ = rates;
1427 memcpy(pos, bss->supp_rates, rates);
1428
1429 if (bss->band == IEEE80211_BAND_2GHZ) {
1430 pos = skb_put(skb, 2 + 1);
1431 *pos++ = WLAN_EID_DS_PARAMS;
1432 *pos++ = 1;
1433 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1434 }
1435
1436 pos = skb_put(skb, 2 + 2);
1437 *pos++ = WLAN_EID_IBSS_PARAMS;
1438 *pos++ = 2;
1439 /* FIX: set ATIM window based on scan results */
1440 *pos++ = 0;
1441 *pos++ = 0;
1442
1443 if (bss->supp_rates_len > 8) {
1444 rates = bss->supp_rates_len - 8;
1445 pos = skb_put(skb, 2 + rates);
1446 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1447 *pos++ = rates;
1448 memcpy(pos, &bss->supp_rates[8], rates);
1449 }
1450
1451 ifsta->probe_resp = skb;
1452
1453 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1454 }
1455
1456 rates = 0;
1457 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1458 for (i = 0; i < bss->supp_rates_len; i++) {
1459 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1460 for (j = 0; j < sband->n_bitrates; j++)
1461 if (sband->bitrates[j].bitrate == bitrate)
1462 rates |= BIT(j);
1463 }
1464 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1465
1466 ieee80211_sta_def_wmm_params(sdata, bss);
1467
1468 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1469 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1470
1471 ieee80211_led_assoc(local, true);
1472
1473 memset(&wrqu, 0, sizeof(wrqu));
1474 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1475 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1476
1477 return res;
1478 }
1479
1480 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1481 struct ieee80211_mgmt *mgmt,
1482 size_t len,
1483 struct ieee80211_rx_status *rx_status,
1484 struct ieee802_11_elems *elems,
1485 bool beacon)
1486 {
1487 struct ieee80211_local *local = sdata->local;
1488 int freq;
1489 struct ieee80211_bss *bss;
1490 struct sta_info *sta;
1491 struct ieee80211_channel *channel;
1492 u64 beacon_timestamp, rx_timestamp;
1493 u64 supp_rates = 0;
1494 enum ieee80211_band band = rx_status->band;
1495
1496 if (elems->ds_params && elems->ds_params_len == 1)
1497 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1498 else
1499 freq = rx_status->freq;
1500
1501 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1502
1503 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1504 return;
1505
1506 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1507 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1508 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1509
1510 rcu_read_lock();
1511
1512 sta = sta_info_get(local, mgmt->sa);
1513 if (sta) {
1514 u64 prev_rates;
1515
1516 prev_rates = sta->sta.supp_rates[band];
1517 /* make sure mandatory rates are always added */
1518 sta->sta.supp_rates[band] = supp_rates |
1519 ieee80211_mandatory_rates(local, band);
1520
1521 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1522 if (sta->sta.supp_rates[band] != prev_rates)
1523 printk(KERN_DEBUG "%s: updated supp_rates set "
1524 "for %pM based on beacon info (0x%llx | "
1525 "0x%llx -> 0x%llx)\n",
1526 sdata->dev->name,
1527 sta->sta.addr,
1528 (unsigned long long) prev_rates,
1529 (unsigned long long) supp_rates,
1530 (unsigned long long) sta->sta.supp_rates[band]);
1531 #endif
1532 } else {
1533 ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
1534 mgmt->sa, supp_rates);
1535 }
1536
1537 rcu_read_unlock();
1538 }
1539
1540 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1541 freq, beacon);
1542 if (!bss)
1543 return;
1544
1545 /* was just updated in ieee80211_bss_info_update */
1546 beacon_timestamp = bss->timestamp;
1547
1548 /*
1549 * In STA mode, the remaining parameters should not be overridden
1550 * by beacons because they're not necessarily accurate there.
1551 */
1552 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1553 bss->last_probe_resp && beacon) {
1554 ieee80211_rx_bss_put(local, bss);
1555 return;
1556 }
1557
1558 /* check if we need to merge IBSS */
1559 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1560 bss->capability & WLAN_CAPABILITY_IBSS &&
1561 bss->freq == local->oper_channel->center_freq &&
1562 elems->ssid_len == sdata->u.sta.ssid_len &&
1563 memcmp(elems->ssid, sdata->u.sta.ssid,
1564 sdata->u.sta.ssid_len) == 0) {
1565 if (rx_status->flag & RX_FLAG_TSFT) {
1566 /* in order for correct IBSS merging we need mactime
1567 *
1568 * since mactime is defined as the time the first data
1569 * symbol of the frame hits the PHY, and the timestamp
1570 * of the beacon is defined as "the time that the data
1571 * symbol containing the first bit of the timestamp is
1572 * transmitted to the PHY plus the transmitting STA’s
1573 * delays through its local PHY from the MAC-PHY
1574 * interface to its interface with the WM"
1575 * (802.11 11.1.2) - equals the time this bit arrives at
1576 * the receiver - we have to take into account the
1577 * offset between the two.
1578 * e.g: at 1 MBit that means mactime is 192 usec earlier
1579 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1580 */
1581 int rate = local->hw.wiphy->bands[band]->
1582 bitrates[rx_status->rate_idx].bitrate;
1583 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1584 } else if (local && local->ops && local->ops->get_tsf)
1585 /* second best option: get current TSF */
1586 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1587 else
1588 /* can't merge without knowing the TSF */
1589 rx_timestamp = -1LLU;
1590 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1591 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1592 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1593 mgmt->sa, mgmt->bssid,
1594 (unsigned long long)rx_timestamp,
1595 (unsigned long long)beacon_timestamp,
1596 (unsigned long long)(rx_timestamp - beacon_timestamp),
1597 jiffies);
1598 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1599 if (beacon_timestamp > rx_timestamp) {
1600 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1601 printk(KERN_DEBUG "%s: beacon TSF higher than "
1602 "local TSF - IBSS merge with BSSID %pM\n",
1603 sdata->dev->name, mgmt->bssid);
1604 #endif
1605 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1606 ieee80211_ibss_add_sta(sdata, NULL,
1607 mgmt->bssid, mgmt->sa,
1608 supp_rates);
1609 }
1610 }
1611
1612 ieee80211_rx_bss_put(local, bss);
1613 }
1614
1615
1616 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1617 struct ieee80211_mgmt *mgmt,
1618 size_t len,
1619 struct ieee80211_rx_status *rx_status)
1620 {
1621 size_t baselen;
1622 struct ieee802_11_elems elems;
1623 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1624
1625 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1626 return; /* ignore ProbeResp to foreign address */
1627
1628 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1629 if (baselen > len)
1630 return;
1631
1632 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1633 &elems);
1634
1635 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1636
1637 /* direct probe may be part of the association flow */
1638 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1639 &ifsta->request)) {
1640 printk(KERN_DEBUG "%s direct probe responded\n",
1641 sdata->dev->name);
1642 ieee80211_authenticate(sdata, ifsta);
1643 }
1644 }
1645
1646
1647 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1648 struct ieee80211_mgmt *mgmt,
1649 size_t len,
1650 struct ieee80211_rx_status *rx_status)
1651 {
1652 struct ieee80211_if_sta *ifsta;
1653 size_t baselen;
1654 struct ieee802_11_elems elems;
1655 struct ieee80211_local *local = sdata->local;
1656 u32 changed = 0;
1657 bool erp_valid;
1658 u8 erp_value = 0;
1659
1660 /* Process beacon from the current BSS */
1661 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1662 if (baselen > len)
1663 return;
1664
1665 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1666
1667 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1668
1669 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1670 return;
1671 ifsta = &sdata->u.sta;
1672
1673 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1674 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1675 return;
1676
1677 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1678 elems.wmm_param_len);
1679
1680
1681 if (elems.erp_info && elems.erp_info_len >= 1) {
1682 erp_valid = true;
1683 erp_value = elems.erp_info[0];
1684 } else {
1685 erp_valid = false;
1686 }
1687 changed |= ieee80211_handle_bss_capability(sdata,
1688 le16_to_cpu(mgmt->u.beacon.capab_info),
1689 erp_valid, erp_value);
1690
1691
1692 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1693 struct sta_info *sta;
1694 struct ieee80211_supported_band *sband;
1695 u16 ap_ht_cap_flags;
1696
1697 rcu_read_lock();
1698
1699 sta = sta_info_get(local, ifsta->bssid);
1700 if (!sta) {
1701 rcu_read_unlock();
1702 return;
1703 }
1704
1705 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1706
1707 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1708 elems.ht_cap_elem, &sta->sta.ht_cap);
1709
1710 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1711
1712 rcu_read_unlock();
1713
1714 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1715 ap_ht_cap_flags);
1716 }
1717
1718 ieee80211_bss_info_change_notify(sdata, changed);
1719 }
1720
1721
1722 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1723 struct ieee80211_if_sta *ifsta,
1724 struct ieee80211_mgmt *mgmt,
1725 size_t len,
1726 struct ieee80211_rx_status *rx_status)
1727 {
1728 struct ieee80211_local *local = sdata->local;
1729 int tx_last_beacon;
1730 struct sk_buff *skb;
1731 struct ieee80211_mgmt *resp;
1732 u8 *pos, *end;
1733
1734 if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1735 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1736 len < 24 + 2 || !ifsta->probe_resp)
1737 return;
1738
1739 if (local->ops->tx_last_beacon)
1740 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1741 else
1742 tx_last_beacon = 1;
1743
1744 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1745 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1746 " (tx_last_beacon=%d)\n",
1747 sdata->dev->name, mgmt->sa, mgmt->da,
1748 mgmt->bssid, tx_last_beacon);
1749 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1750
1751 if (!tx_last_beacon)
1752 return;
1753
1754 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1755 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1756 return;
1757
1758 end = ((u8 *) mgmt) + len;
1759 pos = mgmt->u.probe_req.variable;
1760 if (pos[0] != WLAN_EID_SSID ||
1761 pos + 2 + pos[1] > end) {
1762 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1763 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1764 "from %pM\n",
1765 sdata->dev->name, mgmt->sa);
1766 #endif
1767 return;
1768 }
1769 if (pos[1] != 0 &&
1770 (pos[1] != ifsta->ssid_len ||
1771 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1772 /* Ignore ProbeReq for foreign SSID */
1773 return;
1774 }
1775
1776 /* Reply with ProbeResp */
1777 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1778 if (!skb)
1779 return;
1780
1781 resp = (struct ieee80211_mgmt *) skb->data;
1782 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1783 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1784 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1785 sdata->dev->name, resp->da);
1786 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1787 ieee80211_tx_skb(sdata, skb, 0);
1788 }
1789
1790 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1791 struct ieee80211_rx_status *rx_status)
1792 {
1793 struct ieee80211_local *local = sdata->local;
1794 struct ieee80211_if_sta *ifsta;
1795 struct ieee80211_mgmt *mgmt;
1796 u16 fc;
1797
1798 if (skb->len < 24)
1799 goto fail;
1800
1801 ifsta = &sdata->u.sta;
1802
1803 mgmt = (struct ieee80211_mgmt *) skb->data;
1804 fc = le16_to_cpu(mgmt->frame_control);
1805
1806 switch (fc & IEEE80211_FCTL_STYPE) {
1807 case IEEE80211_STYPE_PROBE_REQ:
1808 case IEEE80211_STYPE_PROBE_RESP:
1809 case IEEE80211_STYPE_BEACON:
1810 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1811 case IEEE80211_STYPE_AUTH:
1812 case IEEE80211_STYPE_ASSOC_RESP:
1813 case IEEE80211_STYPE_REASSOC_RESP:
1814 case IEEE80211_STYPE_DEAUTH:
1815 case IEEE80211_STYPE_DISASSOC:
1816 skb_queue_tail(&ifsta->skb_queue, skb);
1817 queue_work(local->hw.workqueue, &ifsta->work);
1818 return;
1819 }
1820
1821 fail:
1822 kfree_skb(skb);
1823 }
1824
1825 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1826 struct sk_buff *skb)
1827 {
1828 struct ieee80211_rx_status *rx_status;
1829 struct ieee80211_if_sta *ifsta;
1830 struct ieee80211_mgmt *mgmt;
1831 u16 fc;
1832
1833 ifsta = &sdata->u.sta;
1834
1835 rx_status = (struct ieee80211_rx_status *) skb->cb;
1836 mgmt = (struct ieee80211_mgmt *) skb->data;
1837 fc = le16_to_cpu(mgmt->frame_control);
1838
1839 switch (fc & IEEE80211_FCTL_STYPE) {
1840 case IEEE80211_STYPE_PROBE_REQ:
1841 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1842 rx_status);
1843 break;
1844 case IEEE80211_STYPE_PROBE_RESP:
1845 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1846 break;
1847 case IEEE80211_STYPE_BEACON:
1848 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1849 break;
1850 case IEEE80211_STYPE_AUTH:
1851 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1852 break;
1853 case IEEE80211_STYPE_ASSOC_RESP:
1854 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1855 break;
1856 case IEEE80211_STYPE_REASSOC_RESP:
1857 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1858 break;
1859 case IEEE80211_STYPE_DEAUTH:
1860 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1861 break;
1862 case IEEE80211_STYPE_DISASSOC:
1863 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1864 break;
1865 }
1866
1867 kfree_skb(skb);
1868 }
1869
1870
1871 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1872 {
1873 struct ieee80211_local *local = sdata->local;
1874 int active = 0;
1875 struct sta_info *sta;
1876
1877 rcu_read_lock();
1878
1879 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1880 if (sta->sdata == sdata &&
1881 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1882 jiffies)) {
1883 active++;
1884 break;
1885 }
1886 }
1887
1888 rcu_read_unlock();
1889
1890 return active;
1891 }
1892
1893
1894 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
1895 struct ieee80211_if_sta *ifsta)
1896 {
1897 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1898
1899 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
1900 if (ieee80211_sta_active_ibss(sdata))
1901 return;
1902
1903 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1904 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
1905 ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
1906 }
1907
1908
1909 static void ieee80211_sta_timer(unsigned long data)
1910 {
1911 struct ieee80211_sub_if_data *sdata =
1912 (struct ieee80211_sub_if_data *) data;
1913 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1914 struct ieee80211_local *local = sdata->local;
1915
1916 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1917 queue_work(local->hw.workqueue, &ifsta->work);
1918 }
1919
1920 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
1921 struct ieee80211_if_sta *ifsta)
1922 {
1923 struct ieee80211_local *local = sdata->local;
1924
1925 if (local->ops->reset_tsf) {
1926 /* Reset own TSF to allow time synchronization work. */
1927 local->ops->reset_tsf(local_to_hw(local));
1928 }
1929
1930 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1931
1932
1933 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1934 ifsta->auth_alg = WLAN_AUTH_OPEN;
1935 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1936 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
1937 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1938 ifsta->auth_alg = WLAN_AUTH_LEAP;
1939 else
1940 ifsta->auth_alg = WLAN_AUTH_OPEN;
1941 ifsta->auth_transaction = -1;
1942 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
1943 ifsta->assoc_scan_tries = 0;
1944 ifsta->direct_probe_tries = 0;
1945 ifsta->auth_tries = 0;
1946 ifsta->assoc_tries = 0;
1947 netif_tx_stop_all_queues(sdata->dev);
1948 netif_carrier_off(sdata->dev);
1949 }
1950
1951
1952 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
1953 const char *ssid, int ssid_len)
1954 {
1955 int tmp, hidden_ssid;
1956
1957 if (ssid_len == ifsta->ssid_len &&
1958 !memcmp(ifsta->ssid, ssid, ssid_len))
1959 return 1;
1960
1961 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1962 return 0;
1963
1964 hidden_ssid = 1;
1965 tmp = ssid_len;
1966 while (tmp--) {
1967 if (ssid[tmp] != '\0') {
1968 hidden_ssid = 0;
1969 break;
1970 }
1971 }
1972
1973 if (hidden_ssid && ifsta->ssid_len == ssid_len)
1974 return 1;
1975
1976 if (ssid_len == 1 && ssid[0] == ' ')
1977 return 1;
1978
1979 return 0;
1980 }
1981
1982 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
1983 struct ieee80211_if_sta *ifsta)
1984 {
1985 struct ieee80211_local *local = sdata->local;
1986 struct ieee80211_bss *bss;
1987 struct ieee80211_supported_band *sband;
1988 u8 bssid[ETH_ALEN], *pos;
1989 int i;
1990 int ret;
1991
1992 #if 0
1993 /* Easier testing, use fixed BSSID. */
1994 memset(bssid, 0xfe, ETH_ALEN);
1995 #else
1996 /* Generate random, not broadcast, locally administered BSSID. Mix in
1997 * own MAC address to make sure that devices that do not have proper
1998 * random number generator get different BSSID. */
1999 get_random_bytes(bssid, ETH_ALEN);
2000 for (i = 0; i < ETH_ALEN; i++)
2001 bssid[i] ^= sdata->dev->dev_addr[i];
2002 bssid[0] &= ~0x01;
2003 bssid[0] |= 0x02;
2004 #endif
2005
2006 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2007 sdata->dev->name, bssid);
2008
2009 bss = ieee80211_rx_bss_add(local, bssid,
2010 local->hw.conf.channel->center_freq,
2011 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2012 if (!bss)
2013 return -ENOMEM;
2014
2015 bss->band = local->hw.conf.channel->band;
2016 sband = local->hw.wiphy->bands[bss->band];
2017
2018 if (local->hw.conf.beacon_int == 0)
2019 local->hw.conf.beacon_int = 100;
2020 bss->beacon_int = local->hw.conf.beacon_int;
2021 bss->last_update = jiffies;
2022 bss->capability = WLAN_CAPABILITY_IBSS;
2023
2024 if (sdata->default_key)
2025 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2026 else
2027 sdata->drop_unencrypted = 0;
2028
2029 bss->supp_rates_len = sband->n_bitrates;
2030 pos = bss->supp_rates;
2031 for (i = 0; i < sband->n_bitrates; i++) {
2032 int rate = sband->bitrates[i].bitrate;
2033 *pos++ = (u8) (rate / 5);
2034 }
2035
2036 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2037 ieee80211_rx_bss_put(local, bss);
2038 return ret;
2039 }
2040
2041
2042 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2043 struct ieee80211_if_sta *ifsta)
2044 {
2045 struct ieee80211_local *local = sdata->local;
2046 struct ieee80211_bss *bss;
2047 int found = 0;
2048 u8 bssid[ETH_ALEN];
2049 int active_ibss;
2050
2051 if (ifsta->ssid_len == 0)
2052 return -EINVAL;
2053
2054 active_ibss = ieee80211_sta_active_ibss(sdata);
2055 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2056 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2057 sdata->dev->name, active_ibss);
2058 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2059 spin_lock_bh(&local->bss_lock);
2060 list_for_each_entry(bss, &local->bss_list, list) {
2061 if (ifsta->ssid_len != bss->ssid_len ||
2062 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2063 || !(bss->capability & WLAN_CAPABILITY_IBSS))
2064 continue;
2065 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2066 printk(KERN_DEBUG " bssid=%pM found\n", bss->bssid);
2067 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2068 memcpy(bssid, bss->bssid, ETH_ALEN);
2069 found = 1;
2070 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2071 break;
2072 }
2073 spin_unlock_bh(&local->bss_lock);
2074
2075 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2076 if (found)
2077 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
2078 "%pM\n", bssid, ifsta->bssid);
2079 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2080
2081 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2082 int ret;
2083 int search_freq;
2084
2085 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2086 search_freq = bss->freq;
2087 else
2088 search_freq = local->hw.conf.channel->center_freq;
2089
2090 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2091 ifsta->ssid, ifsta->ssid_len);
2092 if (!bss)
2093 goto dont_join;
2094
2095 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2096 " based on configured SSID\n",
2097 sdata->dev->name, bssid);
2098 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2099 ieee80211_rx_bss_put(local, bss);
2100 return ret;
2101 }
2102
2103 dont_join:
2104 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2105 printk(KERN_DEBUG " did not try to join ibss\n");
2106 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2107
2108 /* Selected IBSS not found in current scan results - try to scan */
2109 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2110 !ieee80211_sta_active_ibss(sdata)) {
2111 mod_timer(&ifsta->timer, jiffies +
2112 IEEE80211_IBSS_MERGE_INTERVAL);
2113 } else if (time_after(jiffies, local->last_scan_completed +
2114 IEEE80211_SCAN_INTERVAL)) {
2115 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2116 "join\n", sdata->dev->name);
2117 return ieee80211_request_scan(sdata, ifsta->ssid,
2118 ifsta->ssid_len);
2119 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2120 int interval = IEEE80211_SCAN_INTERVAL;
2121
2122 if (time_after(jiffies, ifsta->ibss_join_req +
2123 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2124 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2125 (!(local->oper_channel->flags &
2126 IEEE80211_CHAN_NO_IBSS)))
2127 return ieee80211_sta_create_ibss(sdata, ifsta);
2128 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2129 printk(KERN_DEBUG "%s: IBSS not allowed on"
2130 " %d MHz\n", sdata->dev->name,
2131 local->hw.conf.channel->center_freq);
2132 }
2133
2134 /* No IBSS found - decrease scan interval and continue
2135 * scanning. */
2136 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2137 }
2138
2139 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2140 mod_timer(&ifsta->timer, jiffies + interval);
2141 return 0;
2142 }
2143
2144 return 0;
2145 }
2146
2147
2148 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2149 struct ieee80211_if_sta *ifsta)
2150 {
2151 struct ieee80211_local *local = sdata->local;
2152 struct ieee80211_bss *bss, *selected = NULL;
2153 int top_rssi = 0, freq;
2154
2155 spin_lock_bh(&local->bss_lock);
2156 freq = local->oper_channel->center_freq;
2157 list_for_each_entry(bss, &local->bss_list, list) {
2158 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2159 continue;
2160
2161 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2162 IEEE80211_STA_AUTO_BSSID_SEL |
2163 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2164 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2165 !!sdata->default_key))
2166 continue;
2167
2168 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2169 bss->freq != freq)
2170 continue;
2171
2172 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2173 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2174 continue;
2175
2176 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2177 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2178 continue;
2179
2180 if (!selected || top_rssi < bss->signal) {
2181 selected = bss;
2182 top_rssi = bss->signal;
2183 }
2184 }
2185 if (selected)
2186 atomic_inc(&selected->users);
2187 spin_unlock_bh(&local->bss_lock);
2188
2189 if (selected) {
2190 ieee80211_set_freq(sdata, selected->freq);
2191 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2192 ieee80211_sta_set_ssid(sdata, selected->ssid,
2193 selected->ssid_len);
2194 ieee80211_sta_set_bssid(sdata, selected->bssid);
2195 ieee80211_sta_def_wmm_params(sdata, selected);
2196
2197 /* Send out direct probe if no probe resp was received or
2198 * the one we have is outdated
2199 */
2200 if (!selected->last_probe_resp ||
2201 time_after(jiffies, selected->last_probe_resp
2202 + IEEE80211_SCAN_RESULT_EXPIRE))
2203 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2204 else
2205 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2206
2207 ieee80211_rx_bss_put(local, selected);
2208 ieee80211_sta_reset_auth(sdata, ifsta);
2209 return 0;
2210 } else {
2211 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2212 ifsta->assoc_scan_tries++;
2213 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2214 ieee80211_start_scan(sdata, NULL, 0);
2215 else
2216 ieee80211_start_scan(sdata, ifsta->ssid,
2217 ifsta->ssid_len);
2218 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2219 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2220 } else
2221 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2222 }
2223 return -1;
2224 }
2225
2226
2227 static void ieee80211_sta_work(struct work_struct *work)
2228 {
2229 struct ieee80211_sub_if_data *sdata =
2230 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2231 struct ieee80211_local *local = sdata->local;
2232 struct ieee80211_if_sta *ifsta;
2233 struct sk_buff *skb;
2234
2235 if (!netif_running(sdata->dev))
2236 return;
2237
2238 if (local->sw_scanning || local->hw_scanning)
2239 return;
2240
2241 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2242 sdata->vif.type != NL80211_IFTYPE_ADHOC))
2243 return;
2244 ifsta = &sdata->u.sta;
2245
2246 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2247 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2248
2249 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2250 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2251 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2252 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2253 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2254 ifsta->scan_ssid_len);
2255 return;
2256 }
2257
2258 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2259 if (ieee80211_sta_config_auth(sdata, ifsta))
2260 return;
2261 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2262 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2263 return;
2264
2265 switch (ifsta->state) {
2266 case IEEE80211_STA_MLME_DISABLED:
2267 break;
2268 case IEEE80211_STA_MLME_DIRECT_PROBE:
2269 ieee80211_direct_probe(sdata, ifsta);
2270 break;
2271 case IEEE80211_STA_MLME_AUTHENTICATE:
2272 ieee80211_authenticate(sdata, ifsta);
2273 break;
2274 case IEEE80211_STA_MLME_ASSOCIATE:
2275 ieee80211_associate(sdata, ifsta);
2276 break;
2277 case IEEE80211_STA_MLME_ASSOCIATED:
2278 ieee80211_associated(sdata, ifsta);
2279 break;
2280 case IEEE80211_STA_MLME_IBSS_SEARCH:
2281 ieee80211_sta_find_ibss(sdata, ifsta);
2282 break;
2283 case IEEE80211_STA_MLME_IBSS_JOINED:
2284 ieee80211_sta_merge_ibss(sdata, ifsta);
2285 break;
2286 default:
2287 WARN_ON(1);
2288 break;
2289 }
2290
2291 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2292 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2293 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2294
2295 ieee80211_set_disassoc(sdata, ifsta, false, true,
2296 WLAN_REASON_UNSPECIFIED);
2297 }
2298 }
2299
2300 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2301 {
2302 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2303 queue_work(sdata->local->hw.workqueue,
2304 &sdata->u.sta.work);
2305 }
2306
2307 /* interface setup */
2308 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2309 {
2310 struct ieee80211_if_sta *ifsta;
2311
2312 ifsta = &sdata->u.sta;
2313 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2314 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2315 (unsigned long) sdata);
2316 skb_queue_head_init(&ifsta->skb_queue);
2317
2318 ifsta->capab = WLAN_CAPABILITY_ESS;
2319 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2320 IEEE80211_AUTH_ALG_SHARED_KEY;
2321 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2322 IEEE80211_STA_AUTO_BSSID_SEL |
2323 IEEE80211_STA_AUTO_CHANNEL_SEL;
2324 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2325 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2326 }
2327
2328 /*
2329 * Add a new IBSS station, will also be called by the RX code when,
2330 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2331 * must be callable in atomic context.
2332 */
2333 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2334 struct sk_buff *skb, u8 *bssid,
2335 u8 *addr, u64 supp_rates)
2336 {
2337 struct ieee80211_local *local = sdata->local;
2338 struct sta_info *sta;
2339 int band = local->hw.conf.channel->band;
2340
2341 /* TODO: Could consider removing the least recently used entry and
2342 * allow new one to be added. */
2343 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2344 if (net_ratelimit()) {
2345 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2346 "entry %pM\n", sdata->dev->name, addr);
2347 }
2348 return NULL;
2349 }
2350
2351 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2352 return NULL;
2353
2354 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2355 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2356 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2357 #endif
2358
2359 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2360 if (!sta)
2361 return NULL;
2362
2363 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2364
2365 /* make sure mandatory rates are always added */
2366 sta->sta.supp_rates[band] = supp_rates |
2367 ieee80211_mandatory_rates(local, band);
2368
2369 rate_control_rate_init(sta);
2370
2371 if (sta_info_insert(sta))
2372 return NULL;
2373
2374 return sta;
2375 }
2376
2377 /* configuration hooks */
2378 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2379 struct ieee80211_if_sta *ifsta)
2380 {
2381 struct ieee80211_local *local = sdata->local;
2382
2383 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2384 return;
2385
2386 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2387 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2388 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2389 IEEE80211_STA_AUTO_SSID_SEL))) {
2390
2391 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2392 ieee80211_set_disassoc(sdata, ifsta, true, true,
2393 WLAN_REASON_DEAUTH_LEAVING);
2394
2395 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2396 queue_work(local->hw.workqueue, &ifsta->work);
2397 }
2398 }
2399
2400 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2401 {
2402 struct ieee80211_if_sta *ifsta;
2403 int res;
2404
2405 if (len > IEEE80211_MAX_SSID_LEN)
2406 return -EINVAL;
2407
2408 ifsta = &sdata->u.sta;
2409
2410 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2411 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2412 memcpy(ifsta->ssid, ssid, len);
2413 ifsta->ssid_len = len;
2414 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2415
2416 res = 0;
2417 /*
2418 * Hack! MLME code needs to be cleaned up to have different
2419 * entry points for configuration and internal selection change
2420 */
2421 if (netif_running(sdata->dev))
2422 res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
2423 if (res) {
2424 printk(KERN_DEBUG "%s: Failed to config new SSID to "
2425 "the low-level driver\n", sdata->dev->name);
2426 return res;
2427 }
2428 }
2429
2430 if (len)
2431 ifsta->flags |= IEEE80211_STA_SSID_SET;
2432 else
2433 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2434
2435 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2436 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2437 ifsta->ibss_join_req = jiffies;
2438 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2439 return ieee80211_sta_find_ibss(sdata, ifsta);
2440 }
2441
2442 return 0;
2443 }
2444
2445 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2446 {
2447 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2448 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2449 *len = ifsta->ssid_len;
2450 return 0;
2451 }
2452
2453 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2454 {
2455 struct ieee80211_if_sta *ifsta;
2456 int res;
2457
2458 ifsta = &sdata->u.sta;
2459
2460 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2461 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2462 res = 0;
2463 /*
2464 * Hack! See also ieee80211_sta_set_ssid.
2465 */
2466 if (netif_running(sdata->dev))
2467 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2468 if (res) {
2469 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2470 "the low-level driver\n", sdata->dev->name);
2471 return res;
2472 }
2473 }
2474
2475 if (is_valid_ether_addr(bssid))
2476 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2477 else
2478 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2479
2480 return 0;
2481 }
2482
2483 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2484 {
2485 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2486
2487 kfree(ifsta->extra_ie);
2488 if (len == 0) {
2489 ifsta->extra_ie = NULL;
2490 ifsta->extra_ie_len = 0;
2491 return 0;
2492 }
2493 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2494 if (!ifsta->extra_ie) {
2495 ifsta->extra_ie_len = 0;
2496 return -ENOMEM;
2497 }
2498 memcpy(ifsta->extra_ie, ie, len);
2499 ifsta->extra_ie_len = len;
2500 return 0;
2501 }
2502
2503 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2504 {
2505 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2506
2507 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2508 sdata->dev->name, reason);
2509
2510 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2511 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2512 return -EINVAL;
2513
2514 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2515 return 0;
2516 }
2517
2518 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2519 {
2520 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2521
2522 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2523 sdata->dev->name, reason);
2524
2525 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2526 return -EINVAL;
2527
2528 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2529 return -1;
2530
2531 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2532 return 0;
2533 }
2534
2535 /* scan finished notification */
2536 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2537 {
2538 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2539 struct ieee80211_if_sta *ifsta;
2540
2541 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2542 ifsta = &sdata->u.sta;
2543 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2544 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2545 !ieee80211_sta_active_ibss(sdata)))
2546 ieee80211_sta_find_ibss(sdata, ifsta);
2547 }
2548
2549 /* Restart STA timers */
2550 rcu_read_lock();
2551 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2552 ieee80211_restart_sta_timer(sdata);
2553 rcu_read_unlock();
2554 }
2555
2556 /* driver notification call */
2557 void ieee80211_notify_mac(struct ieee80211_hw *hw,
2558 enum ieee80211_notification_types notif_type)
2559 {
2560 struct ieee80211_local *local = hw_to_local(hw);
2561 struct ieee80211_sub_if_data *sdata;
2562
2563 switch (notif_type) {
2564 case IEEE80211_NOTIFY_RE_ASSOC:
2565 rcu_read_lock();
2566 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2567 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2568 continue;
2569
2570 ieee80211_sta_req_auth(sdata, &sdata->u.sta);
2571 }
2572 rcu_read_unlock();
2573 break;
2574 }
2575 }
2576 EXPORT_SYMBOL(ieee80211_notify_mac);
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