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mac80211: convert to %pM away from print_mac
[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/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_add_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_info.ht_supported &&
397 (ht_add_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_EXTRA_INFO))) {
398 struct ieee80211_ht_addt_info *ht_add_info =
399 (struct ieee80211_ht_addt_info *)ht_add_ie;
400 u16 cap = sband->ht_info.cap;
401 __le16 tmp;
402 u32 flags = local->hw.conf.channel->flags;
403
404 switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
405 case IEEE80211_HT_IE_CHA_SEC_ABOVE:
406 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
407 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
408 cap &= ~IEEE80211_HT_CAP_SGI_40;
409 }
410 break;
411 case IEEE80211_HT_IE_CHA_SEC_BELOW:
412 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
413 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
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_info.ampdu_factor |
428 (sband->ht_info.ampdu_density << 2);
429 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
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_protect_preamb(struct ieee80211_sub_if_data *sdata,
572 bool use_protection,
573 bool use_short_preamble)
574 {
575 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
576 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
577 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
578 #endif
579 u32 changed = 0;
580
581 if (use_protection != bss_conf->use_cts_prot) {
582 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
583 if (net_ratelimit()) {
584 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
585 sdata->dev->name,
586 use_protection ? "enabled" : "disabled",
587 ifsta->bssid);
588 }
589 #endif
590 bss_conf->use_cts_prot = use_protection;
591 changed |= BSS_CHANGED_ERP_CTS_PROT;
592 }
593
594 if (use_short_preamble != bss_conf->use_short_preamble) {
595 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
596 if (net_ratelimit()) {
597 printk(KERN_DEBUG "%s: switched to %s barker preamble"
598 " (BSSID=%pM)\n",
599 sdata->dev->name,
600 use_short_preamble ? "short" : "long",
601 ifsta->bssid);
602 }
603 #endif
604 bss_conf->use_short_preamble = use_short_preamble;
605 changed |= BSS_CHANGED_ERP_PREAMBLE;
606 }
607
608 return changed;
609 }
610
611 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
612 u8 erp_value)
613 {
614 bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
615 bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
616
617 return ieee80211_handle_protect_preamb(sdata,
618 use_protection, use_short_preamble);
619 }
620
621 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
622 struct ieee80211_bss *bss)
623 {
624 u32 changed = 0;
625
626 if (bss->has_erp_value)
627 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
628 else {
629 u16 capab = bss->capability;
630 changed |= ieee80211_handle_protect_preamb(sdata, false,
631 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
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 {
704 struct ieee80211_local *local = sdata->local;
705 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
706 u32 changed = BSS_CHANGED_ASSOC;
707
708 struct ieee80211_bss *bss;
709
710 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
711
712 if (sdata->vif.type != NL80211_IFTYPE_STATION)
713 return;
714
715 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
716 conf->channel->center_freq,
717 ifsta->ssid, ifsta->ssid_len);
718 if (bss) {
719 /* set timing information */
720 sdata->bss_conf.beacon_int = bss->beacon_int;
721 sdata->bss_conf.timestamp = bss->timestamp;
722 sdata->bss_conf.dtim_period = bss->dtim_period;
723
724 changed |= ieee80211_handle_bss_capability(sdata, bss);
725
726 ieee80211_rx_bss_put(local, bss);
727 }
728
729 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
730 changed |= BSS_CHANGED_HT;
731 sdata->bss_conf.assoc_ht = 1;
732 sdata->bss_conf.ht_conf = &conf->ht_conf;
733 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
734 }
735
736 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
737 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
738 ieee80211_sta_send_associnfo(sdata, ifsta);
739
740 ifsta->last_probe = jiffies;
741 ieee80211_led_assoc(local, 1);
742
743 sdata->bss_conf.assoc = 1;
744 /*
745 * For now just always ask the driver to update the basic rateset
746 * when we have associated, we aren't checking whether it actually
747 * changed or not.
748 */
749 changed |= BSS_CHANGED_BASIC_RATES;
750 ieee80211_bss_info_change_notify(sdata, changed);
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 return;
767 }
768
769 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
770 sdata->dev->name, ifsta->bssid,
771 ifsta->direct_probe_tries);
772
773 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
774
775 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
776
777 /* Direct probe is sent to broadcast address as some APs
778 * will not answer to direct packet in unassociated state.
779 */
780 ieee80211_send_probe_req(sdata, NULL,
781 ifsta->ssid, ifsta->ssid_len);
782
783 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
784 }
785
786
787 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
788 struct ieee80211_if_sta *ifsta)
789 {
790 ifsta->auth_tries++;
791 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
792 printk(KERN_DEBUG "%s: authentication with AP %pM"
793 " timed out\n",
794 sdata->dev->name, ifsta->bssid);
795 ifsta->state = IEEE80211_STA_MLME_DISABLED;
796 return;
797 }
798
799 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
800 printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
801 sdata->dev->name, ifsta->bssid);
802
803 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
804
805 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
806 }
807
808 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
809 struct ieee80211_if_sta *ifsta, bool deauth,
810 bool self_disconnected, u16 reason)
811 {
812 struct ieee80211_local *local = sdata->local;
813 struct sta_info *sta;
814 u32 changed = BSS_CHANGED_ASSOC;
815
816 rcu_read_lock();
817
818 sta = sta_info_get(local, ifsta->bssid);
819 if (!sta) {
820 rcu_read_unlock();
821 return;
822 }
823
824 if (deauth) {
825 ifsta->direct_probe_tries = 0;
826 ifsta->auth_tries = 0;
827 }
828 ifsta->assoc_scan_tries = 0;
829 ifsta->assoc_tries = 0;
830
831 netif_tx_stop_all_queues(sdata->dev);
832 netif_carrier_off(sdata->dev);
833
834 ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
835
836 if (self_disconnected) {
837 if (deauth)
838 ieee80211_send_deauth_disassoc(sdata,
839 IEEE80211_STYPE_DEAUTH, reason);
840 else
841 ieee80211_send_deauth_disassoc(sdata,
842 IEEE80211_STYPE_DISASSOC, reason);
843 }
844
845 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
846 changed |= ieee80211_reset_erp_info(sdata);
847
848 if (sdata->bss_conf.assoc_ht)
849 changed |= BSS_CHANGED_HT;
850
851 sdata->bss_conf.assoc_ht = 0;
852 sdata->bss_conf.ht_conf = NULL;
853 sdata->bss_conf.ht_bss_conf = NULL;
854
855 ieee80211_led_assoc(local, 0);
856 sdata->bss_conf.assoc = 0;
857
858 ieee80211_sta_send_apinfo(sdata, ifsta);
859
860 if (self_disconnected)
861 ifsta->state = IEEE80211_STA_MLME_DISABLED;
862
863 sta_info_unlink(&sta);
864
865 rcu_read_unlock();
866
867 sta_info_destroy(sta);
868 }
869
870 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
871 {
872 if (!sdata || !sdata->default_key ||
873 sdata->default_key->conf.alg != ALG_WEP)
874 return 0;
875 return 1;
876 }
877
878 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
879 struct ieee80211_if_sta *ifsta)
880 {
881 struct ieee80211_local *local = sdata->local;
882 struct ieee80211_bss *bss;
883 int bss_privacy;
884 int wep_privacy;
885 int privacy_invoked;
886
887 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
888 return 0;
889
890 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
891 local->hw.conf.channel->center_freq,
892 ifsta->ssid, ifsta->ssid_len);
893 if (!bss)
894 return 0;
895
896 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
897 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
898 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
899
900 ieee80211_rx_bss_put(local, bss);
901
902 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
903 return 0;
904
905 return 1;
906 }
907
908 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
909 struct ieee80211_if_sta *ifsta)
910 {
911 ifsta->assoc_tries++;
912 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
913 printk(KERN_DEBUG "%s: association with AP %pM"
914 " timed out\n",
915 sdata->dev->name, ifsta->bssid);
916 ifsta->state = IEEE80211_STA_MLME_DISABLED;
917 return;
918 }
919
920 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
921 printk(KERN_DEBUG "%s: associate with AP %pM\n",
922 sdata->dev->name, ifsta->bssid);
923 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
924 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
925 "mixed-cell disabled - abort association\n", sdata->dev->name);
926 ifsta->state = IEEE80211_STA_MLME_DISABLED;
927 return;
928 }
929
930 ieee80211_send_assoc(sdata, ifsta);
931
932 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
933 }
934
935
936 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
937 struct ieee80211_if_sta *ifsta)
938 {
939 struct ieee80211_local *local = sdata->local;
940 struct sta_info *sta;
941 int disassoc;
942
943 /* TODO: start monitoring current AP signal quality and number of
944 * missed beacons. Scan other channels every now and then and search
945 * for better APs. */
946 /* TODO: remove expired BSSes */
947
948 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
949
950 rcu_read_lock();
951
952 sta = sta_info_get(local, ifsta->bssid);
953 if (!sta) {
954 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
955 sdata->dev->name, ifsta->bssid);
956 disassoc = 1;
957 } else {
958 disassoc = 0;
959 if (time_after(jiffies,
960 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
961 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
962 printk(KERN_DEBUG "%s: No ProbeResp from "
963 "current AP %pM - assume out of "
964 "range\n",
965 sdata->dev->name, ifsta->bssid);
966 disassoc = 1;
967 } else
968 ieee80211_send_probe_req(sdata, ifsta->bssid,
969 ifsta->ssid,
970 ifsta->ssid_len);
971 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
972 } else {
973 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
974 if (time_after(jiffies, ifsta->last_probe +
975 IEEE80211_PROBE_INTERVAL)) {
976 ifsta->last_probe = jiffies;
977 ieee80211_send_probe_req(sdata, ifsta->bssid,
978 ifsta->ssid,
979 ifsta->ssid_len);
980 }
981 }
982 }
983
984 rcu_read_unlock();
985
986 if (disassoc)
987 ieee80211_set_disassoc(sdata, ifsta, true, true,
988 WLAN_REASON_PREV_AUTH_NOT_VALID);
989 else
990 mod_timer(&ifsta->timer, jiffies +
991 IEEE80211_MONITORING_INTERVAL);
992 }
993
994
995 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
996 struct ieee80211_if_sta *ifsta)
997 {
998 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
999 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1000 ieee80211_associate(sdata, ifsta);
1001 }
1002
1003
1004 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1005 struct ieee80211_if_sta *ifsta,
1006 struct ieee80211_mgmt *mgmt,
1007 size_t len)
1008 {
1009 u8 *pos;
1010 struct ieee802_11_elems elems;
1011
1012 pos = mgmt->u.auth.variable;
1013 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1014 if (!elems.challenge)
1015 return;
1016 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1017 elems.challenge_len + 2, 1);
1018 }
1019
1020 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1021 struct ieee80211_if_sta *ifsta,
1022 struct ieee80211_mgmt *mgmt,
1023 size_t len)
1024 {
1025 u16 auth_alg, auth_transaction, status_code;
1026
1027 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1028 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1029 return;
1030
1031 if (len < 24 + 6)
1032 return;
1033
1034 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1035 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1036 return;
1037
1038 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1039 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1040 return;
1041
1042 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1043 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1044 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1045
1046 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1047 /*
1048 * IEEE 802.11 standard does not require authentication in IBSS
1049 * networks and most implementations do not seem to use it.
1050 * However, try to reply to authentication attempts if someone
1051 * has actually implemented this.
1052 */
1053 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1054 return;
1055 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1056 }
1057
1058 if (auth_alg != ifsta->auth_alg ||
1059 auth_transaction != ifsta->auth_transaction)
1060 return;
1061
1062 if (status_code != WLAN_STATUS_SUCCESS) {
1063 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1064 u8 algs[3];
1065 const int num_algs = ARRAY_SIZE(algs);
1066 int i, pos;
1067 algs[0] = algs[1] = algs[2] = 0xff;
1068 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1069 algs[0] = WLAN_AUTH_OPEN;
1070 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1071 algs[1] = WLAN_AUTH_SHARED_KEY;
1072 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1073 algs[2] = WLAN_AUTH_LEAP;
1074 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1075 pos = 0;
1076 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1077 pos = 1;
1078 else
1079 pos = 2;
1080 for (i = 0; i < num_algs; i++) {
1081 pos++;
1082 if (pos >= num_algs)
1083 pos = 0;
1084 if (algs[pos] == ifsta->auth_alg ||
1085 algs[pos] == 0xff)
1086 continue;
1087 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1088 !ieee80211_sta_wep_configured(sdata))
1089 continue;
1090 ifsta->auth_alg = algs[pos];
1091 break;
1092 }
1093 }
1094 return;
1095 }
1096
1097 switch (ifsta->auth_alg) {
1098 case WLAN_AUTH_OPEN:
1099 case WLAN_AUTH_LEAP:
1100 ieee80211_auth_completed(sdata, ifsta);
1101 break;
1102 case WLAN_AUTH_SHARED_KEY:
1103 if (ifsta->auth_transaction == 4)
1104 ieee80211_auth_completed(sdata, ifsta);
1105 else
1106 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1107 break;
1108 }
1109 }
1110
1111
1112 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1113 struct ieee80211_if_sta *ifsta,
1114 struct ieee80211_mgmt *mgmt,
1115 size_t len)
1116 {
1117 u16 reason_code;
1118
1119 if (len < 24 + 2)
1120 return;
1121
1122 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1123 return;
1124
1125 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1126
1127 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1128 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
1129
1130 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1131 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1132 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1133 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1134 mod_timer(&ifsta->timer, jiffies +
1135 IEEE80211_RETRY_AUTH_INTERVAL);
1136 }
1137
1138 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1139 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1140 }
1141
1142
1143 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1144 struct ieee80211_if_sta *ifsta,
1145 struct ieee80211_mgmt *mgmt,
1146 size_t len)
1147 {
1148 u16 reason_code;
1149
1150 if (len < 24 + 2)
1151 return;
1152
1153 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1154 return;
1155
1156 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1157
1158 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1159 printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name);
1160
1161 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1162 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1163 mod_timer(&ifsta->timer, jiffies +
1164 IEEE80211_RETRY_AUTH_INTERVAL);
1165 }
1166
1167 ieee80211_set_disassoc(sdata, ifsta, false, false, 0);
1168 }
1169
1170
1171 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1172 struct ieee80211_if_sta *ifsta,
1173 struct ieee80211_mgmt *mgmt,
1174 size_t len,
1175 int reassoc)
1176 {
1177 struct ieee80211_local *local = sdata->local;
1178 struct ieee80211_supported_band *sband;
1179 struct sta_info *sta;
1180 u64 rates, basic_rates;
1181 u16 capab_info, status_code, aid;
1182 struct ieee802_11_elems elems;
1183 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
1184 u8 *pos;
1185 int i, j;
1186 bool have_higher_than_11mbit = false;
1187
1188 /* AssocResp and ReassocResp have identical structure, so process both
1189 * of them in this function. */
1190
1191 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1192 return;
1193
1194 if (len < 24 + 6)
1195 return;
1196
1197 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1198 return;
1199
1200 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1201 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1202 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1203
1204 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1205 "status=%d aid=%d)\n",
1206 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1207 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1208
1209 if (status_code != WLAN_STATUS_SUCCESS) {
1210 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1211 sdata->dev->name, status_code);
1212 /* if this was a reassociation, ensure we try a "full"
1213 * association next time. This works around some broken APs
1214 * which do not correctly reject reassociation requests. */
1215 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1216 return;
1217 }
1218
1219 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1220 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1221 "set\n", sdata->dev->name, aid);
1222 aid &= ~(BIT(15) | BIT(14));
1223
1224 pos = mgmt->u.assoc_resp.variable;
1225 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1226
1227 if (!elems.supp_rates) {
1228 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1229 sdata->dev->name);
1230 return;
1231 }
1232
1233 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1234 ifsta->aid = aid;
1235 ifsta->ap_capab = capab_info;
1236
1237 kfree(ifsta->assocresp_ies);
1238 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1239 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1240 if (ifsta->assocresp_ies)
1241 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1242
1243 rcu_read_lock();
1244
1245 /* Add STA entry for the AP */
1246 sta = sta_info_get(local, ifsta->bssid);
1247 if (!sta) {
1248 struct ieee80211_bss *bss;
1249 int err;
1250
1251 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1252 if (!sta) {
1253 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1254 " the AP\n", sdata->dev->name);
1255 rcu_read_unlock();
1256 return;
1257 }
1258 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1259 local->hw.conf.channel->center_freq,
1260 ifsta->ssid, ifsta->ssid_len);
1261 if (bss) {
1262 sta->last_signal = bss->signal;
1263 sta->last_qual = bss->qual;
1264 sta->last_noise = bss->noise;
1265 ieee80211_rx_bss_put(local, bss);
1266 }
1267
1268 err = sta_info_insert(sta);
1269 if (err) {
1270 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1271 " the AP (error %d)\n", sdata->dev->name, err);
1272 rcu_read_unlock();
1273 return;
1274 }
1275 /* update new sta with its last rx activity */
1276 sta->last_rx = jiffies;
1277 }
1278
1279 /*
1280 * FIXME: Do we really need to update the sta_info's information here?
1281 * We already know about the AP (we found it in our list) so it
1282 * should already be filled with the right info, no?
1283 * As is stands, all this is racy because typically we assume
1284 * the information that is filled in here (except flags) doesn't
1285 * change while a STA structure is alive. As such, it should move
1286 * to between the sta_info_alloc() and sta_info_insert() above.
1287 */
1288
1289 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1290 WLAN_STA_AUTHORIZED);
1291
1292 rates = 0;
1293 basic_rates = 0;
1294 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1295
1296 for (i = 0; i < elems.supp_rates_len; i++) {
1297 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1298
1299 if (rate > 110)
1300 have_higher_than_11mbit = true;
1301
1302 for (j = 0; j < sband->n_bitrates; j++) {
1303 if (sband->bitrates[j].bitrate == rate)
1304 rates |= BIT(j);
1305 if (elems.supp_rates[i] & 0x80)
1306 basic_rates |= BIT(j);
1307 }
1308 }
1309
1310 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1311 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1312
1313 if (rate > 110)
1314 have_higher_than_11mbit = true;
1315
1316 for (j = 0; j < sband->n_bitrates; j++) {
1317 if (sband->bitrates[j].bitrate == rate)
1318 rates |= BIT(j);
1319 if (elems.ext_supp_rates[i] & 0x80)
1320 basic_rates |= BIT(j);
1321 }
1322 }
1323
1324 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1325 sdata->bss_conf.basic_rates = basic_rates;
1326
1327 /* cf. IEEE 802.11 9.2.12 */
1328 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1329 have_higher_than_11mbit)
1330 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1331 else
1332 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1333
1334 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1335 (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1336 struct ieee80211_ht_bss_info bss_info;
1337 ieee80211_ht_cap_ie_to_ht_info(
1338 elems.ht_cap_elem, &sta->sta.ht_info);
1339 ieee80211_ht_addt_info_ie_to_ht_bss_info(
1340 elems.ht_info_elem, &bss_info);
1341 ieee80211_handle_ht(local, 1, &sta->sta.ht_info, &bss_info);
1342 }
1343
1344 rate_control_rate_init(sta);
1345
1346 if (elems.wmm_param) {
1347 set_sta_flags(sta, WLAN_STA_WME);
1348 rcu_read_unlock();
1349 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1350 elems.wmm_param_len);
1351 } else
1352 rcu_read_unlock();
1353
1354 /* set AID and assoc capability,
1355 * ieee80211_set_associated() will tell the driver */
1356 bss_conf->aid = aid;
1357 bss_conf->assoc_capability = capab_info;
1358 ieee80211_set_associated(sdata, ifsta);
1359
1360 ieee80211_associated(sdata, ifsta);
1361 }
1362
1363
1364 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1365 struct ieee80211_if_sta *ifsta,
1366 struct ieee80211_bss *bss)
1367 {
1368 struct ieee80211_local *local = sdata->local;
1369 int res, rates, i, j;
1370 struct sk_buff *skb;
1371 struct ieee80211_mgmt *mgmt;
1372 u8 *pos;
1373 struct ieee80211_supported_band *sband;
1374 union iwreq_data wrqu;
1375
1376 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1377
1378 /* Remove possible STA entries from other IBSS networks. */
1379 sta_info_flush_delayed(sdata);
1380
1381 if (local->ops->reset_tsf) {
1382 /* Reset own TSF to allow time synchronization work. */
1383 local->ops->reset_tsf(local_to_hw(local));
1384 }
1385 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1386 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1387 if (res)
1388 return res;
1389
1390 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1391
1392 sdata->drop_unencrypted = bss->capability &
1393 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1394
1395 res = ieee80211_set_freq(sdata, bss->freq);
1396
1397 if (res)
1398 return res;
1399
1400 /* Build IBSS probe response */
1401 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1402 if (skb) {
1403 skb_reserve(skb, local->hw.extra_tx_headroom);
1404
1405 mgmt = (struct ieee80211_mgmt *)
1406 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1407 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1408 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1409 IEEE80211_STYPE_PROBE_RESP);
1410 memset(mgmt->da, 0xff, ETH_ALEN);
1411 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1412 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1413 mgmt->u.beacon.beacon_int =
1414 cpu_to_le16(local->hw.conf.beacon_int);
1415 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1416 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1417
1418 pos = skb_put(skb, 2 + ifsta->ssid_len);
1419 *pos++ = WLAN_EID_SSID;
1420 *pos++ = ifsta->ssid_len;
1421 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1422
1423 rates = bss->supp_rates_len;
1424 if (rates > 8)
1425 rates = 8;
1426 pos = skb_put(skb, 2 + rates);
1427 *pos++ = WLAN_EID_SUPP_RATES;
1428 *pos++ = rates;
1429 memcpy(pos, bss->supp_rates, rates);
1430
1431 if (bss->band == IEEE80211_BAND_2GHZ) {
1432 pos = skb_put(skb, 2 + 1);
1433 *pos++ = WLAN_EID_DS_PARAMS;
1434 *pos++ = 1;
1435 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1436 }
1437
1438 pos = skb_put(skb, 2 + 2);
1439 *pos++ = WLAN_EID_IBSS_PARAMS;
1440 *pos++ = 2;
1441 /* FIX: set ATIM window based on scan results */
1442 *pos++ = 0;
1443 *pos++ = 0;
1444
1445 if (bss->supp_rates_len > 8) {
1446 rates = bss->supp_rates_len - 8;
1447 pos = skb_put(skb, 2 + rates);
1448 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1449 *pos++ = rates;
1450 memcpy(pos, &bss->supp_rates[8], rates);
1451 }
1452
1453 ifsta->probe_resp = skb;
1454
1455 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1456 }
1457
1458 rates = 0;
1459 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1460 for (i = 0; i < bss->supp_rates_len; i++) {
1461 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1462 for (j = 0; j < sband->n_bitrates; j++)
1463 if (sband->bitrates[j].bitrate == bitrate)
1464 rates |= BIT(j);
1465 }
1466 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1467
1468 ieee80211_sta_def_wmm_params(sdata, bss);
1469
1470 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1471 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1472
1473 ieee80211_led_assoc(local, true);
1474
1475 memset(&wrqu, 0, sizeof(wrqu));
1476 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1477 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1478
1479 return res;
1480 }
1481
1482 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1483 struct ieee80211_mgmt *mgmt,
1484 size_t len,
1485 struct ieee80211_rx_status *rx_status,
1486 struct ieee802_11_elems *elems,
1487 bool beacon)
1488 {
1489 struct ieee80211_local *local = sdata->local;
1490 int freq;
1491 struct ieee80211_bss *bss;
1492 struct sta_info *sta;
1493 struct ieee80211_channel *channel;
1494 u64 beacon_timestamp, rx_timestamp;
1495 u64 supp_rates = 0;
1496 enum ieee80211_band band = rx_status->band;
1497
1498 if (elems->ds_params && elems->ds_params_len == 1)
1499 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1500 else
1501 freq = rx_status->freq;
1502
1503 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1504
1505 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1506 return;
1507
1508 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1509 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1510 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1511
1512 rcu_read_lock();
1513
1514 sta = sta_info_get(local, mgmt->sa);
1515 if (sta) {
1516 u64 prev_rates;
1517
1518 prev_rates = sta->sta.supp_rates[band];
1519 /* make sure mandatory rates are always added */
1520 sta->sta.supp_rates[band] = supp_rates |
1521 ieee80211_mandatory_rates(local, band);
1522
1523 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1524 if (sta->sta.supp_rates[band] != prev_rates)
1525 printk(KERN_DEBUG "%s: updated supp_rates set "
1526 "for %pM based on beacon info (0x%llx | "
1527 "0x%llx -> 0x%llx)\n",
1528 sdata->dev->name,
1529 sta->sta.addr,
1530 (unsigned long long) prev_rates,
1531 (unsigned long long) supp_rates,
1532 (unsigned long long) sta->sta.supp_rates[band]);
1533 #endif
1534 } else {
1535 ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
1536 mgmt->sa, supp_rates);
1537 }
1538
1539 rcu_read_unlock();
1540 }
1541
1542 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1543 freq, beacon);
1544 if (!bss)
1545 return;
1546
1547 /* was just updated in ieee80211_bss_info_update */
1548 beacon_timestamp = bss->timestamp;
1549
1550 /*
1551 * In STA mode, the remaining parameters should not be overridden
1552 * by beacons because they're not necessarily accurate there.
1553 */
1554 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1555 bss->last_probe_resp && beacon) {
1556 ieee80211_rx_bss_put(local, bss);
1557 return;
1558 }
1559
1560 /* check if we need to merge IBSS */
1561 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1562 bss->capability & WLAN_CAPABILITY_IBSS &&
1563 bss->freq == local->oper_channel->center_freq &&
1564 elems->ssid_len == sdata->u.sta.ssid_len &&
1565 memcmp(elems->ssid, sdata->u.sta.ssid,
1566 sdata->u.sta.ssid_len) == 0) {
1567 if (rx_status->flag & RX_FLAG_TSFT) {
1568 /* in order for correct IBSS merging we need mactime
1569 *
1570 * since mactime is defined as the time the first data
1571 * symbol of the frame hits the PHY, and the timestamp
1572 * of the beacon is defined as "the time that the data
1573 * symbol containing the first bit of the timestamp is
1574 * transmitted to the PHY plus the transmitting STA’s
1575 * delays through its local PHY from the MAC-PHY
1576 * interface to its interface with the WM"
1577 * (802.11 11.1.2) - equals the time this bit arrives at
1578 * the receiver - we have to take into account the
1579 * offset between the two.
1580 * e.g: at 1 MBit that means mactime is 192 usec earlier
1581 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1582 */
1583 int rate = local->hw.wiphy->bands[band]->
1584 bitrates[rx_status->rate_idx].bitrate;
1585 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1586 } else if (local && local->ops && local->ops->get_tsf)
1587 /* second best option: get current TSF */
1588 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1589 else
1590 /* can't merge without knowing the TSF */
1591 rx_timestamp = -1LLU;
1592 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1593 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1594 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1595 mgmt->sa, mgmt->bssid,
1596 (unsigned long long)rx_timestamp,
1597 (unsigned long long)beacon_timestamp,
1598 (unsigned long long)(rx_timestamp - beacon_timestamp),
1599 jiffies);
1600 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1601 if (beacon_timestamp > rx_timestamp) {
1602 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1603 printk(KERN_DEBUG "%s: beacon TSF higher than "
1604 "local TSF - IBSS merge with BSSID %pM\n",
1605 sdata->dev->name, mgmt->bssid);
1606 #endif
1607 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1608 ieee80211_ibss_add_sta(sdata, NULL,
1609 mgmt->bssid, mgmt->sa,
1610 supp_rates);
1611 }
1612 }
1613
1614 ieee80211_rx_bss_put(local, bss);
1615 }
1616
1617
1618 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1619 struct ieee80211_mgmt *mgmt,
1620 size_t len,
1621 struct ieee80211_rx_status *rx_status)
1622 {
1623 size_t baselen;
1624 struct ieee802_11_elems elems;
1625 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1626
1627 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1628 return; /* ignore ProbeResp to foreign address */
1629
1630 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1631 if (baselen > len)
1632 return;
1633
1634 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1635 &elems);
1636
1637 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1638
1639 /* direct probe may be part of the association flow */
1640 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1641 &ifsta->request)) {
1642 printk(KERN_DEBUG "%s direct probe responded\n",
1643 sdata->dev->name);
1644 ieee80211_authenticate(sdata, ifsta);
1645 }
1646 }
1647
1648
1649 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1650 struct ieee80211_mgmt *mgmt,
1651 size_t len,
1652 struct ieee80211_rx_status *rx_status)
1653 {
1654 struct ieee80211_if_sta *ifsta;
1655 size_t baselen;
1656 struct ieee802_11_elems elems;
1657 struct ieee80211_local *local = sdata->local;
1658 struct ieee80211_conf *conf = &local->hw.conf;
1659 u32 changed = 0;
1660
1661 /* Process beacon from the current BSS */
1662 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1663 if (baselen > len)
1664 return;
1665
1666 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1667
1668 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1669
1670 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1671 return;
1672 ifsta = &sdata->u.sta;
1673
1674 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1675 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1676 return;
1677
1678 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1679 elems.wmm_param_len);
1680
1681 if (elems.erp_info && elems.erp_info_len >= 1)
1682 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
1683 else {
1684 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
1685 changed |= ieee80211_handle_protect_preamb(sdata, false,
1686 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
1687 }
1688
1689 if (elems.ht_cap_elem && elems.ht_info_elem &&
1690 elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
1691 struct ieee80211_ht_bss_info bss_info;
1692
1693 ieee80211_ht_addt_info_ie_to_ht_bss_info(
1694 elems.ht_info_elem, &bss_info);
1695 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
1696 &bss_info);
1697 }
1698
1699 ieee80211_bss_info_change_notify(sdata, changed);
1700 }
1701
1702
1703 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1704 struct ieee80211_if_sta *ifsta,
1705 struct ieee80211_mgmt *mgmt,
1706 size_t len,
1707 struct ieee80211_rx_status *rx_status)
1708 {
1709 struct ieee80211_local *local = sdata->local;
1710 int tx_last_beacon;
1711 struct sk_buff *skb;
1712 struct ieee80211_mgmt *resp;
1713 u8 *pos, *end;
1714
1715 if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1716 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1717 len < 24 + 2 || !ifsta->probe_resp)
1718 return;
1719
1720 if (local->ops->tx_last_beacon)
1721 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1722 else
1723 tx_last_beacon = 1;
1724
1725 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1726 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1727 " (tx_last_beacon=%d)\n",
1728 sdata->dev->name, mgmt->sa, mgmt->da,
1729 mgmt->bssid, tx_last_beacon);
1730 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1731
1732 if (!tx_last_beacon)
1733 return;
1734
1735 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1736 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1737 return;
1738
1739 end = ((u8 *) mgmt) + len;
1740 pos = mgmt->u.probe_req.variable;
1741 if (pos[0] != WLAN_EID_SSID ||
1742 pos + 2 + pos[1] > end) {
1743 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1744 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1745 "from %pM\n",
1746 sdata->dev->name, mgmt->sa);
1747 #endif
1748 return;
1749 }
1750 if (pos[1] != 0 &&
1751 (pos[1] != ifsta->ssid_len ||
1752 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1753 /* Ignore ProbeReq for foreign SSID */
1754 return;
1755 }
1756
1757 /* Reply with ProbeResp */
1758 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1759 if (!skb)
1760 return;
1761
1762 resp = (struct ieee80211_mgmt *) skb->data;
1763 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1764 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1765 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1766 sdata->dev->name, resp->da);
1767 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1768 ieee80211_tx_skb(sdata, skb, 0);
1769 }
1770
1771 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1772 struct ieee80211_rx_status *rx_status)
1773 {
1774 struct ieee80211_local *local = sdata->local;
1775 struct ieee80211_if_sta *ifsta;
1776 struct ieee80211_mgmt *mgmt;
1777 u16 fc;
1778
1779 if (skb->len < 24)
1780 goto fail;
1781
1782 ifsta = &sdata->u.sta;
1783
1784 mgmt = (struct ieee80211_mgmt *) skb->data;
1785 fc = le16_to_cpu(mgmt->frame_control);
1786
1787 switch (fc & IEEE80211_FCTL_STYPE) {
1788 case IEEE80211_STYPE_PROBE_REQ:
1789 case IEEE80211_STYPE_PROBE_RESP:
1790 case IEEE80211_STYPE_BEACON:
1791 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1792 case IEEE80211_STYPE_AUTH:
1793 case IEEE80211_STYPE_ASSOC_RESP:
1794 case IEEE80211_STYPE_REASSOC_RESP:
1795 case IEEE80211_STYPE_DEAUTH:
1796 case IEEE80211_STYPE_DISASSOC:
1797 skb_queue_tail(&ifsta->skb_queue, skb);
1798 queue_work(local->hw.workqueue, &ifsta->work);
1799 return;
1800 }
1801
1802 fail:
1803 kfree_skb(skb);
1804 }
1805
1806 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1807 struct sk_buff *skb)
1808 {
1809 struct ieee80211_rx_status *rx_status;
1810 struct ieee80211_if_sta *ifsta;
1811 struct ieee80211_mgmt *mgmt;
1812 u16 fc;
1813
1814 ifsta = &sdata->u.sta;
1815
1816 rx_status = (struct ieee80211_rx_status *) skb->cb;
1817 mgmt = (struct ieee80211_mgmt *) skb->data;
1818 fc = le16_to_cpu(mgmt->frame_control);
1819
1820 switch (fc & IEEE80211_FCTL_STYPE) {
1821 case IEEE80211_STYPE_PROBE_REQ:
1822 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1823 rx_status);
1824 break;
1825 case IEEE80211_STYPE_PROBE_RESP:
1826 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1827 break;
1828 case IEEE80211_STYPE_BEACON:
1829 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1830 break;
1831 case IEEE80211_STYPE_AUTH:
1832 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1833 break;
1834 case IEEE80211_STYPE_ASSOC_RESP:
1835 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1836 break;
1837 case IEEE80211_STYPE_REASSOC_RESP:
1838 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1839 break;
1840 case IEEE80211_STYPE_DEAUTH:
1841 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1842 break;
1843 case IEEE80211_STYPE_DISASSOC:
1844 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1845 break;
1846 }
1847
1848 kfree_skb(skb);
1849 }
1850
1851
1852 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1853 {
1854 struct ieee80211_local *local = sdata->local;
1855 int active = 0;
1856 struct sta_info *sta;
1857
1858 rcu_read_lock();
1859
1860 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1861 if (sta->sdata == sdata &&
1862 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1863 jiffies)) {
1864 active++;
1865 break;
1866 }
1867 }
1868
1869 rcu_read_unlock();
1870
1871 return active;
1872 }
1873
1874
1875 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
1876 struct ieee80211_if_sta *ifsta)
1877 {
1878 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1879
1880 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
1881 if (ieee80211_sta_active_ibss(sdata))
1882 return;
1883
1884 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1885 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
1886 ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
1887 }
1888
1889
1890 static void ieee80211_sta_timer(unsigned long data)
1891 {
1892 struct ieee80211_sub_if_data *sdata =
1893 (struct ieee80211_sub_if_data *) data;
1894 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1895 struct ieee80211_local *local = sdata->local;
1896
1897 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1898 queue_work(local->hw.workqueue, &ifsta->work);
1899 }
1900
1901 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
1902 struct ieee80211_if_sta *ifsta)
1903 {
1904 struct ieee80211_local *local = sdata->local;
1905
1906 if (local->ops->reset_tsf) {
1907 /* Reset own TSF to allow time synchronization work. */
1908 local->ops->reset_tsf(local_to_hw(local));
1909 }
1910
1911 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1912
1913
1914 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1915 ifsta->auth_alg = WLAN_AUTH_OPEN;
1916 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1917 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
1918 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1919 ifsta->auth_alg = WLAN_AUTH_LEAP;
1920 else
1921 ifsta->auth_alg = WLAN_AUTH_OPEN;
1922 ifsta->auth_transaction = -1;
1923 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
1924 ifsta->assoc_scan_tries = 0;
1925 ifsta->direct_probe_tries = 0;
1926 ifsta->auth_tries = 0;
1927 ifsta->assoc_tries = 0;
1928 netif_tx_stop_all_queues(sdata->dev);
1929 netif_carrier_off(sdata->dev);
1930 }
1931
1932
1933 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
1934 const char *ssid, int ssid_len)
1935 {
1936 int tmp, hidden_ssid;
1937
1938 if (ssid_len == ifsta->ssid_len &&
1939 !memcmp(ifsta->ssid, ssid, ssid_len))
1940 return 1;
1941
1942 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1943 return 0;
1944
1945 hidden_ssid = 1;
1946 tmp = ssid_len;
1947 while (tmp--) {
1948 if (ssid[tmp] != '\0') {
1949 hidden_ssid = 0;
1950 break;
1951 }
1952 }
1953
1954 if (hidden_ssid && ifsta->ssid_len == ssid_len)
1955 return 1;
1956
1957 if (ssid_len == 1 && ssid[0] == ' ')
1958 return 1;
1959
1960 return 0;
1961 }
1962
1963 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
1964 struct ieee80211_if_sta *ifsta)
1965 {
1966 struct ieee80211_local *local = sdata->local;
1967 struct ieee80211_bss *bss;
1968 struct ieee80211_supported_band *sband;
1969 u8 bssid[ETH_ALEN], *pos;
1970 int i;
1971 int ret;
1972
1973 #if 0
1974 /* Easier testing, use fixed BSSID. */
1975 memset(bssid, 0xfe, ETH_ALEN);
1976 #else
1977 /* Generate random, not broadcast, locally administered BSSID. Mix in
1978 * own MAC address to make sure that devices that do not have proper
1979 * random number generator get different BSSID. */
1980 get_random_bytes(bssid, ETH_ALEN);
1981 for (i = 0; i < ETH_ALEN; i++)
1982 bssid[i] ^= sdata->dev->dev_addr[i];
1983 bssid[0] &= ~0x01;
1984 bssid[0] |= 0x02;
1985 #endif
1986
1987 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
1988 sdata->dev->name, bssid);
1989
1990 bss = ieee80211_rx_bss_add(local, bssid,
1991 local->hw.conf.channel->center_freq,
1992 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
1993 if (!bss)
1994 return -ENOMEM;
1995
1996 bss->band = local->hw.conf.channel->band;
1997 sband = local->hw.wiphy->bands[bss->band];
1998
1999 if (local->hw.conf.beacon_int == 0)
2000 local->hw.conf.beacon_int = 100;
2001 bss->beacon_int = local->hw.conf.beacon_int;
2002 bss->last_update = jiffies;
2003 bss->capability = WLAN_CAPABILITY_IBSS;
2004
2005 if (sdata->default_key)
2006 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2007 else
2008 sdata->drop_unencrypted = 0;
2009
2010 bss->supp_rates_len = sband->n_bitrates;
2011 pos = bss->supp_rates;
2012 for (i = 0; i < sband->n_bitrates; i++) {
2013 int rate = sband->bitrates[i].bitrate;
2014 *pos++ = (u8) (rate / 5);
2015 }
2016
2017 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2018 ieee80211_rx_bss_put(local, bss);
2019 return ret;
2020 }
2021
2022
2023 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2024 struct ieee80211_if_sta *ifsta)
2025 {
2026 struct ieee80211_local *local = sdata->local;
2027 struct ieee80211_bss *bss;
2028 int found = 0;
2029 u8 bssid[ETH_ALEN];
2030 int active_ibss;
2031
2032 if (ifsta->ssid_len == 0)
2033 return -EINVAL;
2034
2035 active_ibss = ieee80211_sta_active_ibss(sdata);
2036 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2037 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2038 sdata->dev->name, active_ibss);
2039 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2040 spin_lock_bh(&local->bss_lock);
2041 list_for_each_entry(bss, &local->bss_list, list) {
2042 if (ifsta->ssid_len != bss->ssid_len ||
2043 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2044 || !(bss->capability & WLAN_CAPABILITY_IBSS))
2045 continue;
2046 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2047 printk(KERN_DEBUG " bssid=%pM found\n", bss->bssid);
2048 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2049 memcpy(bssid, bss->bssid, ETH_ALEN);
2050 found = 1;
2051 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2052 break;
2053 }
2054 spin_unlock_bh(&local->bss_lock);
2055
2056 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2057 if (found)
2058 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
2059 "%pM\n", bssid, ifsta->bssid);
2060 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2061
2062 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2063 int ret;
2064 int search_freq;
2065
2066 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2067 search_freq = bss->freq;
2068 else
2069 search_freq = local->hw.conf.channel->center_freq;
2070
2071 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2072 ifsta->ssid, ifsta->ssid_len);
2073 if (!bss)
2074 goto dont_join;
2075
2076 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2077 " based on configured SSID\n",
2078 sdata->dev->name, bssid);
2079 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2080 ieee80211_rx_bss_put(local, bss);
2081 return ret;
2082 }
2083
2084 dont_join:
2085 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2086 printk(KERN_DEBUG " did not try to join ibss\n");
2087 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2088
2089 /* Selected IBSS not found in current scan results - try to scan */
2090 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2091 !ieee80211_sta_active_ibss(sdata)) {
2092 mod_timer(&ifsta->timer, jiffies +
2093 IEEE80211_IBSS_MERGE_INTERVAL);
2094 } else if (time_after(jiffies, local->last_scan_completed +
2095 IEEE80211_SCAN_INTERVAL)) {
2096 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2097 "join\n", sdata->dev->name);
2098 return ieee80211_request_scan(sdata, ifsta->ssid,
2099 ifsta->ssid_len);
2100 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2101 int interval = IEEE80211_SCAN_INTERVAL;
2102
2103 if (time_after(jiffies, ifsta->ibss_join_req +
2104 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2105 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2106 (!(local->oper_channel->flags &
2107 IEEE80211_CHAN_NO_IBSS)))
2108 return ieee80211_sta_create_ibss(sdata, ifsta);
2109 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2110 printk(KERN_DEBUG "%s: IBSS not allowed on"
2111 " %d MHz\n", sdata->dev->name,
2112 local->hw.conf.channel->center_freq);
2113 }
2114
2115 /* No IBSS found - decrease scan interval and continue
2116 * scanning. */
2117 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2118 }
2119
2120 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2121 mod_timer(&ifsta->timer, jiffies + interval);
2122 return 0;
2123 }
2124
2125 return 0;
2126 }
2127
2128
2129 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2130 struct ieee80211_if_sta *ifsta)
2131 {
2132 struct ieee80211_local *local = sdata->local;
2133 struct ieee80211_bss *bss, *selected = NULL;
2134 int top_rssi = 0, freq;
2135
2136 spin_lock_bh(&local->bss_lock);
2137 freq = local->oper_channel->center_freq;
2138 list_for_each_entry(bss, &local->bss_list, list) {
2139 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2140 continue;
2141
2142 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2143 IEEE80211_STA_AUTO_BSSID_SEL |
2144 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2145 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2146 !!sdata->default_key))
2147 continue;
2148
2149 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2150 bss->freq != freq)
2151 continue;
2152
2153 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2154 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2155 continue;
2156
2157 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2158 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2159 continue;
2160
2161 if (!selected || top_rssi < bss->signal) {
2162 selected = bss;
2163 top_rssi = bss->signal;
2164 }
2165 }
2166 if (selected)
2167 atomic_inc(&selected->users);
2168 spin_unlock_bh(&local->bss_lock);
2169
2170 if (selected) {
2171 ieee80211_set_freq(sdata, selected->freq);
2172 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2173 ieee80211_sta_set_ssid(sdata, selected->ssid,
2174 selected->ssid_len);
2175 ieee80211_sta_set_bssid(sdata, selected->bssid);
2176 ieee80211_sta_def_wmm_params(sdata, selected);
2177
2178 /* Send out direct probe if no probe resp was received or
2179 * the one we have is outdated
2180 */
2181 if (!selected->last_probe_resp ||
2182 time_after(jiffies, selected->last_probe_resp
2183 + IEEE80211_SCAN_RESULT_EXPIRE))
2184 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2185 else
2186 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2187
2188 ieee80211_rx_bss_put(local, selected);
2189 ieee80211_sta_reset_auth(sdata, ifsta);
2190 return 0;
2191 } else {
2192 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2193 ifsta->assoc_scan_tries++;
2194 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2195 ieee80211_start_scan(sdata, NULL, 0);
2196 else
2197 ieee80211_start_scan(sdata, ifsta->ssid,
2198 ifsta->ssid_len);
2199 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2200 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2201 } else
2202 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2203 }
2204 return -1;
2205 }
2206
2207
2208 static void ieee80211_sta_work(struct work_struct *work)
2209 {
2210 struct ieee80211_sub_if_data *sdata =
2211 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2212 struct ieee80211_local *local = sdata->local;
2213 struct ieee80211_if_sta *ifsta;
2214 struct sk_buff *skb;
2215
2216 if (!netif_running(sdata->dev))
2217 return;
2218
2219 if (local->sw_scanning || local->hw_scanning)
2220 return;
2221
2222 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2223 sdata->vif.type != NL80211_IFTYPE_ADHOC))
2224 return;
2225 ifsta = &sdata->u.sta;
2226
2227 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2228 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2229
2230 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2231 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2232 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2233 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2234 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2235 ifsta->scan_ssid_len);
2236 return;
2237 }
2238
2239 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2240 if (ieee80211_sta_config_auth(sdata, ifsta))
2241 return;
2242 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2243 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2244 return;
2245
2246 switch (ifsta->state) {
2247 case IEEE80211_STA_MLME_DISABLED:
2248 break;
2249 case IEEE80211_STA_MLME_DIRECT_PROBE:
2250 ieee80211_direct_probe(sdata, ifsta);
2251 break;
2252 case IEEE80211_STA_MLME_AUTHENTICATE:
2253 ieee80211_authenticate(sdata, ifsta);
2254 break;
2255 case IEEE80211_STA_MLME_ASSOCIATE:
2256 ieee80211_associate(sdata, ifsta);
2257 break;
2258 case IEEE80211_STA_MLME_ASSOCIATED:
2259 ieee80211_associated(sdata, ifsta);
2260 break;
2261 case IEEE80211_STA_MLME_IBSS_SEARCH:
2262 ieee80211_sta_find_ibss(sdata, ifsta);
2263 break;
2264 case IEEE80211_STA_MLME_IBSS_JOINED:
2265 ieee80211_sta_merge_ibss(sdata, ifsta);
2266 break;
2267 default:
2268 WARN_ON(1);
2269 break;
2270 }
2271
2272 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2273 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2274 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2275
2276 ieee80211_set_disassoc(sdata, ifsta, false, true,
2277 WLAN_REASON_UNSPECIFIED);
2278 }
2279 }
2280
2281 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2282 {
2283 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2284 queue_work(sdata->local->hw.workqueue,
2285 &sdata->u.sta.work);
2286 }
2287
2288 /* interface setup */
2289 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2290 {
2291 struct ieee80211_if_sta *ifsta;
2292
2293 ifsta = &sdata->u.sta;
2294 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2295 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2296 (unsigned long) sdata);
2297 skb_queue_head_init(&ifsta->skb_queue);
2298
2299 ifsta->capab = WLAN_CAPABILITY_ESS;
2300 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2301 IEEE80211_AUTH_ALG_SHARED_KEY;
2302 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2303 IEEE80211_STA_AUTO_BSSID_SEL |
2304 IEEE80211_STA_AUTO_CHANNEL_SEL;
2305 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2306 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2307 }
2308
2309 /*
2310 * Add a new IBSS station, will also be called by the RX code when,
2311 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2312 * must be callable in atomic context.
2313 */
2314 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2315 struct sk_buff *skb, u8 *bssid,
2316 u8 *addr, u64 supp_rates)
2317 {
2318 struct ieee80211_local *local = sdata->local;
2319 struct sta_info *sta;
2320 int band = local->hw.conf.channel->band;
2321
2322 /* TODO: Could consider removing the least recently used entry and
2323 * allow new one to be added. */
2324 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2325 if (net_ratelimit()) {
2326 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2327 "entry %pM\n", sdata->dev->name, addr);
2328 }
2329 return NULL;
2330 }
2331
2332 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2333 return NULL;
2334
2335 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2336 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2337 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2338 #endif
2339
2340 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2341 if (!sta)
2342 return NULL;
2343
2344 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2345
2346 /* make sure mandatory rates are always added */
2347 sta->sta.supp_rates[band] = supp_rates |
2348 ieee80211_mandatory_rates(local, band);
2349
2350 rate_control_rate_init(sta);
2351
2352 if (sta_info_insert(sta))
2353 return NULL;
2354
2355 return sta;
2356 }
2357
2358 /* configuration hooks */
2359 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2360 struct ieee80211_if_sta *ifsta)
2361 {
2362 struct ieee80211_local *local = sdata->local;
2363
2364 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2365 return;
2366
2367 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2368 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2369 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2370 IEEE80211_STA_AUTO_SSID_SEL))) {
2371
2372 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2373 ieee80211_set_disassoc(sdata, ifsta, true, true,
2374 WLAN_REASON_DEAUTH_LEAVING);
2375
2376 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2377 queue_work(local->hw.workqueue, &ifsta->work);
2378 }
2379 }
2380
2381 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2382 {
2383 struct ieee80211_if_sta *ifsta;
2384 int res;
2385
2386 if (len > IEEE80211_MAX_SSID_LEN)
2387 return -EINVAL;
2388
2389 ifsta = &sdata->u.sta;
2390
2391 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2392 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2393 memcpy(ifsta->ssid, ssid, len);
2394 ifsta->ssid_len = len;
2395 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2396
2397 res = 0;
2398 /*
2399 * Hack! MLME code needs to be cleaned up to have different
2400 * entry points for configuration and internal selection change
2401 */
2402 if (netif_running(sdata->dev))
2403 res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
2404 if (res) {
2405 printk(KERN_DEBUG "%s: Failed to config new SSID to "
2406 "the low-level driver\n", sdata->dev->name);
2407 return res;
2408 }
2409 }
2410
2411 if (len)
2412 ifsta->flags |= IEEE80211_STA_SSID_SET;
2413 else
2414 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2415
2416 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2417 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2418 ifsta->ibss_join_req = jiffies;
2419 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2420 return ieee80211_sta_find_ibss(sdata, ifsta);
2421 }
2422
2423 return 0;
2424 }
2425
2426 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2427 {
2428 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2429 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2430 *len = ifsta->ssid_len;
2431 return 0;
2432 }
2433
2434 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2435 {
2436 struct ieee80211_if_sta *ifsta;
2437 int res;
2438
2439 ifsta = &sdata->u.sta;
2440
2441 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2442 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2443 res = 0;
2444 /*
2445 * Hack! See also ieee80211_sta_set_ssid.
2446 */
2447 if (netif_running(sdata->dev))
2448 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2449 if (res) {
2450 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2451 "the low-level driver\n", sdata->dev->name);
2452 return res;
2453 }
2454 }
2455
2456 if (is_valid_ether_addr(bssid))
2457 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2458 else
2459 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2460
2461 return 0;
2462 }
2463
2464 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2465 {
2466 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2467
2468 kfree(ifsta->extra_ie);
2469 if (len == 0) {
2470 ifsta->extra_ie = NULL;
2471 ifsta->extra_ie_len = 0;
2472 return 0;
2473 }
2474 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2475 if (!ifsta->extra_ie) {
2476 ifsta->extra_ie_len = 0;
2477 return -ENOMEM;
2478 }
2479 memcpy(ifsta->extra_ie, ie, len);
2480 ifsta->extra_ie_len = len;
2481 return 0;
2482 }
2483
2484 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2485 {
2486 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2487
2488 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2489 sdata->dev->name, reason);
2490
2491 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2492 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2493 return -EINVAL;
2494
2495 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2496 return 0;
2497 }
2498
2499 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2500 {
2501 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2502
2503 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2504 sdata->dev->name, reason);
2505
2506 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2507 return -EINVAL;
2508
2509 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2510 return -1;
2511
2512 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2513 return 0;
2514 }
2515
2516 /* scan finished notification */
2517 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2518 {
2519 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2520 struct ieee80211_if_sta *ifsta;
2521
2522 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2523 ifsta = &sdata->u.sta;
2524 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2525 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2526 !ieee80211_sta_active_ibss(sdata)))
2527 ieee80211_sta_find_ibss(sdata, ifsta);
2528 }
2529
2530 /* Restart STA timers */
2531 rcu_read_lock();
2532 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2533 ieee80211_restart_sta_timer(sdata);
2534 rcu_read_unlock();
2535 }
2536
2537 /* driver notification call */
2538 void ieee80211_notify_mac(struct ieee80211_hw *hw,
2539 enum ieee80211_notification_types notif_type)
2540 {
2541 struct ieee80211_local *local = hw_to_local(hw);
2542 struct ieee80211_sub_if_data *sdata;
2543
2544 switch (notif_type) {
2545 case IEEE80211_NOTIFY_RE_ASSOC:
2546 rcu_read_lock();
2547 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2548 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2549 continue;
2550
2551 ieee80211_sta_req_auth(sdata, &sdata->u.sta);
2552 }
2553 rcu_read_unlock();
2554 break;
2555 }
2556 }
2557 EXPORT_SYMBOL(ieee80211_notify_mac);
Linux kernel - Deliverables
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