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mac80211: share STA information with driver
[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 DECLARE_MAC_BUF(mac);
579 #endif
580 u32 changed = 0;
581
582 if (use_protection != bss_conf->use_cts_prot) {
583 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
584 if (net_ratelimit()) {
585 printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
586 "%s)\n",
587 sdata->dev->name,
588 use_protection ? "enabled" : "disabled",
589 print_mac(mac, ifsta->bssid));
590 }
591 #endif
592 bss_conf->use_cts_prot = use_protection;
593 changed |= BSS_CHANGED_ERP_CTS_PROT;
594 }
595
596 if (use_short_preamble != bss_conf->use_short_preamble) {
597 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
598 if (net_ratelimit()) {
599 printk(KERN_DEBUG "%s: switched to %s barker preamble"
600 " (BSSID=%s)\n",
601 sdata->dev->name,
602 use_short_preamble ? "short" : "long",
603 print_mac(mac, ifsta->bssid));
604 }
605 #endif
606 bss_conf->use_short_preamble = use_short_preamble;
607 changed |= BSS_CHANGED_ERP_PREAMBLE;
608 }
609
610 return changed;
611 }
612
613 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
614 u8 erp_value)
615 {
616 bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
617 bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
618
619 return ieee80211_handle_protect_preamb(sdata,
620 use_protection, use_short_preamble);
621 }
622
623 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
624 struct ieee80211_bss *bss)
625 {
626 u32 changed = 0;
627
628 if (bss->has_erp_value)
629 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
630 else {
631 u16 capab = bss->capability;
632 changed |= ieee80211_handle_protect_preamb(sdata, false,
633 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
634 }
635
636 return changed;
637 }
638
639 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
640 struct ieee80211_if_sta *ifsta)
641 {
642 union iwreq_data wrqu;
643 memset(&wrqu, 0, sizeof(wrqu));
644 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
645 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
646 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
647 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
648 }
649
650 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
651 struct ieee80211_if_sta *ifsta)
652 {
653 union iwreq_data wrqu;
654
655 if (ifsta->assocreq_ies) {
656 memset(&wrqu, 0, sizeof(wrqu));
657 wrqu.data.length = ifsta->assocreq_ies_len;
658 wireless_send_event(sdata->dev, IWEVASSOCREQIE, &wrqu,
659 ifsta->assocreq_ies);
660 }
661 if (ifsta->assocresp_ies) {
662 memset(&wrqu, 0, sizeof(wrqu));
663 wrqu.data.length = ifsta->assocresp_ies_len;
664 wireless_send_event(sdata->dev, IWEVASSOCRESPIE, &wrqu,
665 ifsta->assocresp_ies);
666 }
667 }
668
669
670 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
671 struct ieee80211_if_sta *ifsta)
672 {
673 struct ieee80211_local *local = sdata->local;
674 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
675 u32 changed = BSS_CHANGED_ASSOC;
676
677 struct ieee80211_bss *bss;
678
679 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
680
681 if (sdata->vif.type != NL80211_IFTYPE_STATION)
682 return;
683
684 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
685 conf->channel->center_freq,
686 ifsta->ssid, ifsta->ssid_len);
687 if (bss) {
688 /* set timing information */
689 sdata->bss_conf.beacon_int = bss->beacon_int;
690 sdata->bss_conf.timestamp = bss->timestamp;
691 sdata->bss_conf.dtim_period = bss->dtim_period;
692
693 changed |= ieee80211_handle_bss_capability(sdata, bss);
694
695 ieee80211_rx_bss_put(local, bss);
696 }
697
698 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
699 changed |= BSS_CHANGED_HT;
700 sdata->bss_conf.assoc_ht = 1;
701 sdata->bss_conf.ht_conf = &conf->ht_conf;
702 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
703 }
704
705 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
706 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
707 ieee80211_sta_send_associnfo(sdata, ifsta);
708
709 ifsta->last_probe = jiffies;
710 ieee80211_led_assoc(local, 1);
711
712 sdata->bss_conf.assoc = 1;
713 /*
714 * For now just always ask the driver to update the basic rateset
715 * when we have associated, we aren't checking whether it actually
716 * changed or not.
717 */
718 changed |= BSS_CHANGED_BASIC_RATES;
719 ieee80211_bss_info_change_notify(sdata, changed);
720
721 netif_tx_start_all_queues(sdata->dev);
722 netif_carrier_on(sdata->dev);
723
724 ieee80211_sta_send_apinfo(sdata, ifsta);
725 }
726
727 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
728 struct ieee80211_if_sta *ifsta)
729 {
730 DECLARE_MAC_BUF(mac);
731
732 ifsta->direct_probe_tries++;
733 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
734 printk(KERN_DEBUG "%s: direct probe to AP %s timed out\n",
735 sdata->dev->name, print_mac(mac, ifsta->bssid));
736 ifsta->state = IEEE80211_STA_MLME_DISABLED;
737 return;
738 }
739
740 printk(KERN_DEBUG "%s: direct probe to AP %s try %d\n",
741 sdata->dev->name, print_mac(mac, ifsta->bssid),
742 ifsta->direct_probe_tries);
743
744 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
745
746 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
747
748 /* Direct probe is sent to broadcast address as some APs
749 * will not answer to direct packet in unassociated state.
750 */
751 ieee80211_send_probe_req(sdata, NULL,
752 ifsta->ssid, ifsta->ssid_len);
753
754 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
755 }
756
757
758 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
759 struct ieee80211_if_sta *ifsta)
760 {
761 DECLARE_MAC_BUF(mac);
762
763 ifsta->auth_tries++;
764 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
765 printk(KERN_DEBUG "%s: authentication with AP %s"
766 " timed out\n",
767 sdata->dev->name, print_mac(mac, ifsta->bssid));
768 ifsta->state = IEEE80211_STA_MLME_DISABLED;
769 return;
770 }
771
772 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
773 printk(KERN_DEBUG "%s: authenticate with AP %s\n",
774 sdata->dev->name, print_mac(mac, ifsta->bssid));
775
776 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
777
778 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
779 }
780
781 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
782 struct ieee80211_if_sta *ifsta, bool deauth,
783 bool self_disconnected, u16 reason)
784 {
785 struct ieee80211_local *local = sdata->local;
786 struct sta_info *sta;
787 u32 changed = BSS_CHANGED_ASSOC;
788
789 rcu_read_lock();
790
791 sta = sta_info_get(local, ifsta->bssid);
792 if (!sta) {
793 rcu_read_unlock();
794 return;
795 }
796
797 if (deauth) {
798 ifsta->direct_probe_tries = 0;
799 ifsta->auth_tries = 0;
800 }
801 ifsta->assoc_scan_tries = 0;
802 ifsta->assoc_tries = 0;
803
804 netif_tx_stop_all_queues(sdata->dev);
805 netif_carrier_off(sdata->dev);
806
807 ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
808
809 if (self_disconnected) {
810 if (deauth)
811 ieee80211_send_deauth_disassoc(sdata,
812 IEEE80211_STYPE_DEAUTH, reason);
813 else
814 ieee80211_send_deauth_disassoc(sdata,
815 IEEE80211_STYPE_DISASSOC, reason);
816 }
817
818 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
819 changed |= ieee80211_reset_erp_info(sdata);
820
821 if (sdata->bss_conf.assoc_ht)
822 changed |= BSS_CHANGED_HT;
823
824 sdata->bss_conf.assoc_ht = 0;
825 sdata->bss_conf.ht_conf = NULL;
826 sdata->bss_conf.ht_bss_conf = NULL;
827
828 ieee80211_led_assoc(local, 0);
829 sdata->bss_conf.assoc = 0;
830
831 ieee80211_sta_send_apinfo(sdata, ifsta);
832
833 if (self_disconnected)
834 ifsta->state = IEEE80211_STA_MLME_DISABLED;
835
836 sta_info_unlink(&sta);
837
838 rcu_read_unlock();
839
840 sta_info_destroy(sta);
841 }
842
843 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
844 {
845 if (!sdata || !sdata->default_key ||
846 sdata->default_key->conf.alg != ALG_WEP)
847 return 0;
848 return 1;
849 }
850
851 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
852 struct ieee80211_if_sta *ifsta)
853 {
854 struct ieee80211_local *local = sdata->local;
855 struct ieee80211_bss *bss;
856 int bss_privacy;
857 int wep_privacy;
858 int privacy_invoked;
859
860 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
861 return 0;
862
863 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
864 local->hw.conf.channel->center_freq,
865 ifsta->ssid, ifsta->ssid_len);
866 if (!bss)
867 return 0;
868
869 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
870 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
871 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
872
873 ieee80211_rx_bss_put(local, bss);
874
875 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
876 return 0;
877
878 return 1;
879 }
880
881 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
882 struct ieee80211_if_sta *ifsta)
883 {
884 DECLARE_MAC_BUF(mac);
885
886 ifsta->assoc_tries++;
887 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
888 printk(KERN_DEBUG "%s: association with AP %s"
889 " timed out\n",
890 sdata->dev->name, print_mac(mac, ifsta->bssid));
891 ifsta->state = IEEE80211_STA_MLME_DISABLED;
892 return;
893 }
894
895 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
896 printk(KERN_DEBUG "%s: associate with AP %s\n",
897 sdata->dev->name, print_mac(mac, ifsta->bssid));
898 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
899 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
900 "mixed-cell disabled - abort association\n", sdata->dev->name);
901 ifsta->state = IEEE80211_STA_MLME_DISABLED;
902 return;
903 }
904
905 ieee80211_send_assoc(sdata, ifsta);
906
907 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
908 }
909
910
911 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
912 struct ieee80211_if_sta *ifsta)
913 {
914 struct ieee80211_local *local = sdata->local;
915 struct sta_info *sta;
916 int disassoc;
917 DECLARE_MAC_BUF(mac);
918
919 /* TODO: start monitoring current AP signal quality and number of
920 * missed beacons. Scan other channels every now and then and search
921 * for better APs. */
922 /* TODO: remove expired BSSes */
923
924 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
925
926 rcu_read_lock();
927
928 sta = sta_info_get(local, ifsta->bssid);
929 if (!sta) {
930 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
931 sdata->dev->name, print_mac(mac, ifsta->bssid));
932 disassoc = 1;
933 } else {
934 disassoc = 0;
935 if (time_after(jiffies,
936 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
937 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
938 printk(KERN_DEBUG "%s: No ProbeResp from "
939 "current AP %s - assume out of "
940 "range\n",
941 sdata->dev->name, print_mac(mac, ifsta->bssid));
942 disassoc = 1;
943 } else
944 ieee80211_send_probe_req(sdata, ifsta->bssid,
945 local->scan_ssid,
946 local->scan_ssid_len);
947 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
948 } else {
949 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
950 if (time_after(jiffies, ifsta->last_probe +
951 IEEE80211_PROBE_INTERVAL)) {
952 ifsta->last_probe = jiffies;
953 ieee80211_send_probe_req(sdata, ifsta->bssid,
954 ifsta->ssid,
955 ifsta->ssid_len);
956 }
957 }
958 }
959
960 rcu_read_unlock();
961
962 if (disassoc)
963 ieee80211_set_disassoc(sdata, ifsta, true, true,
964 WLAN_REASON_PREV_AUTH_NOT_VALID);
965 else
966 mod_timer(&ifsta->timer, jiffies +
967 IEEE80211_MONITORING_INTERVAL);
968 }
969
970
971 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
972 struct ieee80211_if_sta *ifsta)
973 {
974 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
975 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
976 ieee80211_associate(sdata, ifsta);
977 }
978
979
980 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
981 struct ieee80211_if_sta *ifsta,
982 struct ieee80211_mgmt *mgmt,
983 size_t len)
984 {
985 u8 *pos;
986 struct ieee802_11_elems elems;
987
988 pos = mgmt->u.auth.variable;
989 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
990 if (!elems.challenge)
991 return;
992 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
993 elems.challenge_len + 2, 1);
994 }
995
996 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
997 struct ieee80211_if_sta *ifsta,
998 struct ieee80211_mgmt *mgmt,
999 size_t len)
1000 {
1001 u16 auth_alg, auth_transaction, status_code;
1002 DECLARE_MAC_BUF(mac);
1003
1004 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1005 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1006 return;
1007
1008 if (len < 24 + 6)
1009 return;
1010
1011 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1012 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1013 return;
1014
1015 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1016 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1017 return;
1018
1019 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1020 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1021 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1022
1023 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1024 /*
1025 * IEEE 802.11 standard does not require authentication in IBSS
1026 * networks and most implementations do not seem to use it.
1027 * However, try to reply to authentication attempts if someone
1028 * has actually implemented this.
1029 */
1030 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1031 return;
1032 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1033 }
1034
1035 if (auth_alg != ifsta->auth_alg ||
1036 auth_transaction != ifsta->auth_transaction)
1037 return;
1038
1039 if (status_code != WLAN_STATUS_SUCCESS) {
1040 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1041 u8 algs[3];
1042 const int num_algs = ARRAY_SIZE(algs);
1043 int i, pos;
1044 algs[0] = algs[1] = algs[2] = 0xff;
1045 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1046 algs[0] = WLAN_AUTH_OPEN;
1047 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1048 algs[1] = WLAN_AUTH_SHARED_KEY;
1049 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1050 algs[2] = WLAN_AUTH_LEAP;
1051 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1052 pos = 0;
1053 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1054 pos = 1;
1055 else
1056 pos = 2;
1057 for (i = 0; i < num_algs; i++) {
1058 pos++;
1059 if (pos >= num_algs)
1060 pos = 0;
1061 if (algs[pos] == ifsta->auth_alg ||
1062 algs[pos] == 0xff)
1063 continue;
1064 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1065 !ieee80211_sta_wep_configured(sdata))
1066 continue;
1067 ifsta->auth_alg = algs[pos];
1068 break;
1069 }
1070 }
1071 return;
1072 }
1073
1074 switch (ifsta->auth_alg) {
1075 case WLAN_AUTH_OPEN:
1076 case WLAN_AUTH_LEAP:
1077 ieee80211_auth_completed(sdata, ifsta);
1078 break;
1079 case WLAN_AUTH_SHARED_KEY:
1080 if (ifsta->auth_transaction == 4)
1081 ieee80211_auth_completed(sdata, ifsta);
1082 else
1083 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1084 break;
1085 }
1086 }
1087
1088
1089 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1090 struct ieee80211_if_sta *ifsta,
1091 struct ieee80211_mgmt *mgmt,
1092 size_t len)
1093 {
1094 u16 reason_code;
1095 DECLARE_MAC_BUF(mac);
1096
1097 if (len < 24 + 2)
1098 return;
1099
1100 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1101 return;
1102
1103 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1104
1105 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1106 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
1107
1108 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1109 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1110 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1111 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1112 mod_timer(&ifsta->timer, jiffies +
1113 IEEE80211_RETRY_AUTH_INTERVAL);
1114 }
1115
1116 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1117 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1118 }
1119
1120
1121 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1122 struct ieee80211_if_sta *ifsta,
1123 struct ieee80211_mgmt *mgmt,
1124 size_t len)
1125 {
1126 u16 reason_code;
1127 DECLARE_MAC_BUF(mac);
1128
1129 if (len < 24 + 2)
1130 return;
1131
1132 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1133 return;
1134
1135 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1136
1137 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1138 printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name);
1139
1140 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1141 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1142 mod_timer(&ifsta->timer, jiffies +
1143 IEEE80211_RETRY_AUTH_INTERVAL);
1144 }
1145
1146 ieee80211_set_disassoc(sdata, ifsta, false, false, 0);
1147 }
1148
1149
1150 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1151 struct ieee80211_if_sta *ifsta,
1152 struct ieee80211_mgmt *mgmt,
1153 size_t len,
1154 int reassoc)
1155 {
1156 struct ieee80211_local *local = sdata->local;
1157 struct ieee80211_supported_band *sband;
1158 struct sta_info *sta;
1159 u64 rates, basic_rates;
1160 u16 capab_info, status_code, aid;
1161 struct ieee802_11_elems elems;
1162 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
1163 u8 *pos;
1164 int i, j;
1165 DECLARE_MAC_BUF(mac);
1166 bool have_higher_than_11mbit = false;
1167
1168 /* AssocResp and ReassocResp have identical structure, so process both
1169 * of them in this function. */
1170
1171 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1172 return;
1173
1174 if (len < 24 + 6)
1175 return;
1176
1177 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1178 return;
1179
1180 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1181 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1182 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1183
1184 printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
1185 "status=%d aid=%d)\n",
1186 sdata->dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
1187 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1188
1189 if (status_code != WLAN_STATUS_SUCCESS) {
1190 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1191 sdata->dev->name, status_code);
1192 /* if this was a reassociation, ensure we try a "full"
1193 * association next time. This works around some broken APs
1194 * which do not correctly reject reassociation requests. */
1195 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1196 return;
1197 }
1198
1199 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1200 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1201 "set\n", sdata->dev->name, aid);
1202 aid &= ~(BIT(15) | BIT(14));
1203
1204 pos = mgmt->u.assoc_resp.variable;
1205 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1206
1207 if (!elems.supp_rates) {
1208 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1209 sdata->dev->name);
1210 return;
1211 }
1212
1213 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1214 ifsta->aid = aid;
1215 ifsta->ap_capab = capab_info;
1216
1217 kfree(ifsta->assocresp_ies);
1218 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1219 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1220 if (ifsta->assocresp_ies)
1221 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1222
1223 rcu_read_lock();
1224
1225 /* Add STA entry for the AP */
1226 sta = sta_info_get(local, ifsta->bssid);
1227 if (!sta) {
1228 struct ieee80211_bss *bss;
1229 int err;
1230
1231 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1232 if (!sta) {
1233 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1234 " the AP\n", sdata->dev->name);
1235 rcu_read_unlock();
1236 return;
1237 }
1238 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1239 local->hw.conf.channel->center_freq,
1240 ifsta->ssid, ifsta->ssid_len);
1241 if (bss) {
1242 sta->last_signal = bss->signal;
1243 sta->last_qual = bss->qual;
1244 sta->last_noise = bss->noise;
1245 ieee80211_rx_bss_put(local, bss);
1246 }
1247
1248 err = sta_info_insert(sta);
1249 if (err) {
1250 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1251 " the AP (error %d)\n", sdata->dev->name, err);
1252 rcu_read_unlock();
1253 return;
1254 }
1255 /* update new sta with its last rx activity */
1256 sta->last_rx = jiffies;
1257 }
1258
1259 /*
1260 * FIXME: Do we really need to update the sta_info's information here?
1261 * We already know about the AP (we found it in our list) so it
1262 * should already be filled with the right info, no?
1263 * As is stands, all this is racy because typically we assume
1264 * the information that is filled in here (except flags) doesn't
1265 * change while a STA structure is alive. As such, it should move
1266 * to between the sta_info_alloc() and sta_info_insert() above.
1267 */
1268
1269 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1270 WLAN_STA_AUTHORIZED);
1271
1272 rates = 0;
1273 basic_rates = 0;
1274 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1275
1276 for (i = 0; i < elems.supp_rates_len; i++) {
1277 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1278
1279 if (rate > 110)
1280 have_higher_than_11mbit = true;
1281
1282 for (j = 0; j < sband->n_bitrates; j++) {
1283 if (sband->bitrates[j].bitrate == rate)
1284 rates |= BIT(j);
1285 if (elems.supp_rates[i] & 0x80)
1286 basic_rates |= BIT(j);
1287 }
1288 }
1289
1290 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1291 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1292
1293 if (rate > 110)
1294 have_higher_than_11mbit = true;
1295
1296 for (j = 0; j < sband->n_bitrates; j++) {
1297 if (sband->bitrates[j].bitrate == rate)
1298 rates |= BIT(j);
1299 if (elems.ext_supp_rates[i] & 0x80)
1300 basic_rates |= BIT(j);
1301 }
1302 }
1303
1304 sta->supp_rates[local->hw.conf.channel->band] = rates;
1305 sdata->bss_conf.basic_rates = basic_rates;
1306
1307 /* cf. IEEE 802.11 9.2.12 */
1308 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1309 have_higher_than_11mbit)
1310 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1311 else
1312 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1313
1314 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1315 (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1316 struct ieee80211_ht_bss_info bss_info;
1317 ieee80211_ht_cap_ie_to_ht_info(
1318 (struct ieee80211_ht_cap *)
1319 elems.ht_cap_elem, &sta->ht_info);
1320 ieee80211_ht_addt_info_ie_to_ht_bss_info(
1321 (struct ieee80211_ht_addt_info *)
1322 elems.ht_info_elem, &bss_info);
1323 ieee80211_handle_ht(local, 1, &sta->ht_info, &bss_info);
1324 }
1325
1326 rate_control_rate_init(sta, local);
1327
1328 if (elems.wmm_param) {
1329 set_sta_flags(sta, WLAN_STA_WME);
1330 rcu_read_unlock();
1331 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1332 elems.wmm_param_len);
1333 } else
1334 rcu_read_unlock();
1335
1336 /* set AID and assoc capability,
1337 * ieee80211_set_associated() will tell the driver */
1338 bss_conf->aid = aid;
1339 bss_conf->assoc_capability = capab_info;
1340 ieee80211_set_associated(sdata, ifsta);
1341
1342 ieee80211_associated(sdata, ifsta);
1343 }
1344
1345
1346 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1347 struct ieee80211_if_sta *ifsta,
1348 struct ieee80211_bss *bss)
1349 {
1350 struct ieee80211_local *local = sdata->local;
1351 int res, rates, i, j;
1352 struct sk_buff *skb;
1353 struct ieee80211_mgmt *mgmt;
1354 u8 *pos;
1355 struct ieee80211_supported_band *sband;
1356 union iwreq_data wrqu;
1357
1358 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1359
1360 /* Remove possible STA entries from other IBSS networks. */
1361 sta_info_flush_delayed(sdata);
1362
1363 if (local->ops->reset_tsf) {
1364 /* Reset own TSF to allow time synchronization work. */
1365 local->ops->reset_tsf(local_to_hw(local));
1366 }
1367 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1368 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1369 if (res)
1370 return res;
1371
1372 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1373
1374 sdata->drop_unencrypted = bss->capability &
1375 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1376
1377 res = ieee80211_set_freq(sdata, bss->freq);
1378
1379 if (res)
1380 return res;
1381
1382 /* Build IBSS probe response */
1383 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1384 if (skb) {
1385 skb_reserve(skb, local->hw.extra_tx_headroom);
1386
1387 mgmt = (struct ieee80211_mgmt *)
1388 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1389 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1390 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1391 IEEE80211_STYPE_PROBE_RESP);
1392 memset(mgmt->da, 0xff, ETH_ALEN);
1393 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1394 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1395 mgmt->u.beacon.beacon_int =
1396 cpu_to_le16(local->hw.conf.beacon_int);
1397 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1398 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1399
1400 pos = skb_put(skb, 2 + ifsta->ssid_len);
1401 *pos++ = WLAN_EID_SSID;
1402 *pos++ = ifsta->ssid_len;
1403 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1404
1405 rates = bss->supp_rates_len;
1406 if (rates > 8)
1407 rates = 8;
1408 pos = skb_put(skb, 2 + rates);
1409 *pos++ = WLAN_EID_SUPP_RATES;
1410 *pos++ = rates;
1411 memcpy(pos, bss->supp_rates, rates);
1412
1413 if (bss->band == IEEE80211_BAND_2GHZ) {
1414 pos = skb_put(skb, 2 + 1);
1415 *pos++ = WLAN_EID_DS_PARAMS;
1416 *pos++ = 1;
1417 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1418 }
1419
1420 pos = skb_put(skb, 2 + 2);
1421 *pos++ = WLAN_EID_IBSS_PARAMS;
1422 *pos++ = 2;
1423 /* FIX: set ATIM window based on scan results */
1424 *pos++ = 0;
1425 *pos++ = 0;
1426
1427 if (bss->supp_rates_len > 8) {
1428 rates = bss->supp_rates_len - 8;
1429 pos = skb_put(skb, 2 + rates);
1430 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1431 *pos++ = rates;
1432 memcpy(pos, &bss->supp_rates[8], rates);
1433 }
1434
1435 ifsta->probe_resp = skb;
1436
1437 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1438 }
1439
1440 rates = 0;
1441 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1442 for (i = 0; i < bss->supp_rates_len; i++) {
1443 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1444 for (j = 0; j < sband->n_bitrates; j++)
1445 if (sband->bitrates[j].bitrate == bitrate)
1446 rates |= BIT(j);
1447 }
1448 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1449
1450 ieee80211_sta_def_wmm_params(sdata, bss);
1451
1452 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1453 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1454
1455 memset(&wrqu, 0, sizeof(wrqu));
1456 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1457 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1458
1459 return res;
1460 }
1461
1462 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1463 struct ieee80211_mgmt *mgmt,
1464 size_t len,
1465 struct ieee80211_rx_status *rx_status,
1466 struct ieee802_11_elems *elems,
1467 bool beacon)
1468 {
1469 struct ieee80211_local *local = sdata->local;
1470 int freq;
1471 struct ieee80211_bss *bss;
1472 struct sta_info *sta;
1473 struct ieee80211_channel *channel;
1474 u64 beacon_timestamp, rx_timestamp;
1475 u64 supp_rates = 0;
1476 enum ieee80211_band band = rx_status->band;
1477 DECLARE_MAC_BUF(mac);
1478 DECLARE_MAC_BUF(mac2);
1479
1480 if (elems->ds_params && elems->ds_params_len == 1)
1481 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1482 else
1483 freq = rx_status->freq;
1484
1485 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1486
1487 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1488 return;
1489
1490 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1491 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1492 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1493
1494 rcu_read_lock();
1495
1496 sta = sta_info_get(local, mgmt->sa);
1497 if (sta) {
1498 u64 prev_rates;
1499
1500 prev_rates = sta->supp_rates[band];
1501 /* make sure mandatory rates are always added */
1502 sta->supp_rates[band] = supp_rates |
1503 ieee80211_mandatory_rates(local, band);
1504
1505 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1506 if (sta->supp_rates[band] != prev_rates)
1507 printk(KERN_DEBUG "%s: updated supp_rates set "
1508 "for %s based on beacon info (0x%llx | "
1509 "0x%llx -> 0x%llx)\n",
1510 sdata->dev->name,
1511 print_mac(mac, sta->sta.addr),
1512 (unsigned long long) prev_rates,
1513 (unsigned long long) supp_rates,
1514 (unsigned long long) sta->supp_rates[band]);
1515 #endif
1516 } else {
1517 ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
1518 mgmt->sa, supp_rates);
1519 }
1520
1521 rcu_read_unlock();
1522 }
1523
1524 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1525 freq, beacon);
1526 if (!bss)
1527 return;
1528
1529 /* was just updated in ieee80211_bss_info_update */
1530 beacon_timestamp = bss->timestamp;
1531
1532 /*
1533 * In STA mode, the remaining parameters should not be overridden
1534 * by beacons because they're not necessarily accurate there.
1535 */
1536 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1537 bss->last_probe_resp && beacon) {
1538 ieee80211_rx_bss_put(local, bss);
1539 return;
1540 }
1541
1542 /* check if we need to merge IBSS */
1543 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1544 bss->capability & WLAN_CAPABILITY_IBSS &&
1545 bss->freq == local->oper_channel->center_freq &&
1546 elems->ssid_len == sdata->u.sta.ssid_len &&
1547 memcmp(elems->ssid, sdata->u.sta.ssid,
1548 sdata->u.sta.ssid_len) == 0) {
1549 if (rx_status->flag & RX_FLAG_TSFT) {
1550 /* in order for correct IBSS merging we need mactime
1551 *
1552 * since mactime is defined as the time the first data
1553 * symbol of the frame hits the PHY, and the timestamp
1554 * of the beacon is defined as "the time that the data
1555 * symbol containing the first bit of the timestamp is
1556 * transmitted to the PHY plus the transmitting STA’s
1557 * delays through its local PHY from the MAC-PHY
1558 * interface to its interface with the WM"
1559 * (802.11 11.1.2) - equals the time this bit arrives at
1560 * the receiver - we have to take into account the
1561 * offset between the two.
1562 * e.g: at 1 MBit that means mactime is 192 usec earlier
1563 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1564 */
1565 int rate = local->hw.wiphy->bands[band]->
1566 bitrates[rx_status->rate_idx].bitrate;
1567 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1568 } else if (local && local->ops && local->ops->get_tsf)
1569 /* second best option: get current TSF */
1570 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1571 else
1572 /* can't merge without knowing the TSF */
1573 rx_timestamp = -1LLU;
1574 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1575 printk(KERN_DEBUG "RX beacon SA=%s BSSID="
1576 "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1577 print_mac(mac, mgmt->sa),
1578 print_mac(mac2, mgmt->bssid),
1579 (unsigned long long)rx_timestamp,
1580 (unsigned long long)beacon_timestamp,
1581 (unsigned long long)(rx_timestamp - beacon_timestamp),
1582 jiffies);
1583 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1584 if (beacon_timestamp > rx_timestamp) {
1585 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1586 printk(KERN_DEBUG "%s: beacon TSF higher than "
1587 "local TSF - IBSS merge with BSSID %s\n",
1588 sdata->dev->name, print_mac(mac, mgmt->bssid));
1589 #endif
1590 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1591 ieee80211_ibss_add_sta(sdata, NULL,
1592 mgmt->bssid, mgmt->sa,
1593 supp_rates);
1594 }
1595 }
1596
1597 ieee80211_rx_bss_put(local, bss);
1598 }
1599
1600
1601 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1602 struct ieee80211_mgmt *mgmt,
1603 size_t len,
1604 struct ieee80211_rx_status *rx_status)
1605 {
1606 size_t baselen;
1607 struct ieee802_11_elems elems;
1608 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1609
1610 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1611 return; /* ignore ProbeResp to foreign address */
1612
1613 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1614 if (baselen > len)
1615 return;
1616
1617 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1618 &elems);
1619
1620 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1621
1622 /* direct probe may be part of the association flow */
1623 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1624 &ifsta->request)) {
1625 printk(KERN_DEBUG "%s direct probe responded\n",
1626 sdata->dev->name);
1627 ieee80211_authenticate(sdata, ifsta);
1628 }
1629 }
1630
1631
1632 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1633 struct ieee80211_mgmt *mgmt,
1634 size_t len,
1635 struct ieee80211_rx_status *rx_status)
1636 {
1637 struct ieee80211_if_sta *ifsta;
1638 size_t baselen;
1639 struct ieee802_11_elems elems;
1640 struct ieee80211_local *local = sdata->local;
1641 struct ieee80211_conf *conf = &local->hw.conf;
1642 u32 changed = 0;
1643
1644 /* Process beacon from the current BSS */
1645 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1646 if (baselen > len)
1647 return;
1648
1649 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1650
1651 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1652
1653 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1654 return;
1655 ifsta = &sdata->u.sta;
1656
1657 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1658 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1659 return;
1660
1661 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1662 elems.wmm_param_len);
1663
1664 if (elems.erp_info && elems.erp_info_len >= 1)
1665 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
1666 else {
1667 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
1668 changed |= ieee80211_handle_protect_preamb(sdata, false,
1669 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
1670 }
1671
1672 if (elems.ht_cap_elem && elems.ht_info_elem &&
1673 elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
1674 struct ieee80211_ht_bss_info bss_info;
1675
1676 ieee80211_ht_addt_info_ie_to_ht_bss_info(
1677 (struct ieee80211_ht_addt_info *)
1678 elems.ht_info_elem, &bss_info);
1679 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
1680 &bss_info);
1681 }
1682
1683 ieee80211_bss_info_change_notify(sdata, changed);
1684 }
1685
1686
1687 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1688 struct ieee80211_if_sta *ifsta,
1689 struct ieee80211_mgmt *mgmt,
1690 size_t len,
1691 struct ieee80211_rx_status *rx_status)
1692 {
1693 struct ieee80211_local *local = sdata->local;
1694 int tx_last_beacon;
1695 struct sk_buff *skb;
1696 struct ieee80211_mgmt *resp;
1697 u8 *pos, *end;
1698 DECLARE_MAC_BUF(mac);
1699 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1700 DECLARE_MAC_BUF(mac2);
1701 DECLARE_MAC_BUF(mac3);
1702 #endif
1703
1704 if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1705 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1706 len < 24 + 2 || !ifsta->probe_resp)
1707 return;
1708
1709 if (local->ops->tx_last_beacon)
1710 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1711 else
1712 tx_last_beacon = 1;
1713
1714 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1715 printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
1716 "%s (tx_last_beacon=%d)\n",
1717 sdata->dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
1718 print_mac(mac3, mgmt->bssid), tx_last_beacon);
1719 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1720
1721 if (!tx_last_beacon)
1722 return;
1723
1724 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1725 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1726 return;
1727
1728 end = ((u8 *) mgmt) + len;
1729 pos = mgmt->u.probe_req.variable;
1730 if (pos[0] != WLAN_EID_SSID ||
1731 pos + 2 + pos[1] > end) {
1732 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1733 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1734 "from %s\n",
1735 sdata->dev->name, print_mac(mac, mgmt->sa));
1736 #endif
1737 return;
1738 }
1739 if (pos[1] != 0 &&
1740 (pos[1] != ifsta->ssid_len ||
1741 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1742 /* Ignore ProbeReq for foreign SSID */
1743 return;
1744 }
1745
1746 /* Reply with ProbeResp */
1747 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1748 if (!skb)
1749 return;
1750
1751 resp = (struct ieee80211_mgmt *) skb->data;
1752 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1753 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1754 printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
1755 sdata->dev->name, print_mac(mac, resp->da));
1756 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1757 ieee80211_tx_skb(sdata, skb, 0);
1758 }
1759
1760 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1761 struct ieee80211_rx_status *rx_status)
1762 {
1763 struct ieee80211_local *local = sdata->local;
1764 struct ieee80211_if_sta *ifsta;
1765 struct ieee80211_mgmt *mgmt;
1766 u16 fc;
1767
1768 if (skb->len < 24)
1769 goto fail;
1770
1771 ifsta = &sdata->u.sta;
1772
1773 mgmt = (struct ieee80211_mgmt *) skb->data;
1774 fc = le16_to_cpu(mgmt->frame_control);
1775
1776 switch (fc & IEEE80211_FCTL_STYPE) {
1777 case IEEE80211_STYPE_PROBE_REQ:
1778 case IEEE80211_STYPE_PROBE_RESP:
1779 case IEEE80211_STYPE_BEACON:
1780 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1781 case IEEE80211_STYPE_AUTH:
1782 case IEEE80211_STYPE_ASSOC_RESP:
1783 case IEEE80211_STYPE_REASSOC_RESP:
1784 case IEEE80211_STYPE_DEAUTH:
1785 case IEEE80211_STYPE_DISASSOC:
1786 skb_queue_tail(&ifsta->skb_queue, skb);
1787 queue_work(local->hw.workqueue, &ifsta->work);
1788 return;
1789 }
1790
1791 fail:
1792 kfree_skb(skb);
1793 }
1794
1795 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1796 struct sk_buff *skb)
1797 {
1798 struct ieee80211_rx_status *rx_status;
1799 struct ieee80211_if_sta *ifsta;
1800 struct ieee80211_mgmt *mgmt;
1801 u16 fc;
1802
1803 ifsta = &sdata->u.sta;
1804
1805 rx_status = (struct ieee80211_rx_status *) skb->cb;
1806 mgmt = (struct ieee80211_mgmt *) skb->data;
1807 fc = le16_to_cpu(mgmt->frame_control);
1808
1809 switch (fc & IEEE80211_FCTL_STYPE) {
1810 case IEEE80211_STYPE_PROBE_REQ:
1811 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1812 rx_status);
1813 break;
1814 case IEEE80211_STYPE_PROBE_RESP:
1815 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1816 break;
1817 case IEEE80211_STYPE_BEACON:
1818 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1819 break;
1820 case IEEE80211_STYPE_AUTH:
1821 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1822 break;
1823 case IEEE80211_STYPE_ASSOC_RESP:
1824 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1825 break;
1826 case IEEE80211_STYPE_REASSOC_RESP:
1827 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1828 break;
1829 case IEEE80211_STYPE_DEAUTH:
1830 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1831 break;
1832 case IEEE80211_STYPE_DISASSOC:
1833 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1834 break;
1835 }
1836
1837 kfree_skb(skb);
1838 }
1839
1840
1841 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1842 {
1843 struct ieee80211_local *local = sdata->local;
1844 int active = 0;
1845 struct sta_info *sta;
1846
1847 rcu_read_lock();
1848
1849 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1850 if (sta->sdata == sdata &&
1851 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1852 jiffies)) {
1853 active++;
1854 break;
1855 }
1856 }
1857
1858 rcu_read_unlock();
1859
1860 return active;
1861 }
1862
1863
1864 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
1865 struct ieee80211_if_sta *ifsta)
1866 {
1867 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1868
1869 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
1870 if (ieee80211_sta_active_ibss(sdata))
1871 return;
1872
1873 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1874 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
1875 ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
1876 }
1877
1878
1879 static void ieee80211_sta_timer(unsigned long data)
1880 {
1881 struct ieee80211_sub_if_data *sdata =
1882 (struct ieee80211_sub_if_data *) data;
1883 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1884 struct ieee80211_local *local = sdata->local;
1885
1886 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1887 queue_work(local->hw.workqueue, &ifsta->work);
1888 }
1889
1890 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
1891 struct ieee80211_if_sta *ifsta)
1892 {
1893 struct ieee80211_local *local = sdata->local;
1894
1895 if (local->ops->reset_tsf) {
1896 /* Reset own TSF to allow time synchronization work. */
1897 local->ops->reset_tsf(local_to_hw(local));
1898 }
1899
1900 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1901
1902
1903 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1904 ifsta->auth_alg = WLAN_AUTH_OPEN;
1905 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1906 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
1907 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1908 ifsta->auth_alg = WLAN_AUTH_LEAP;
1909 else
1910 ifsta->auth_alg = WLAN_AUTH_OPEN;
1911 ifsta->auth_transaction = -1;
1912 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
1913 ifsta->assoc_scan_tries = 0;
1914 ifsta->direct_probe_tries = 0;
1915 ifsta->auth_tries = 0;
1916 ifsta->assoc_tries = 0;
1917 netif_tx_stop_all_queues(sdata->dev);
1918 netif_carrier_off(sdata->dev);
1919 }
1920
1921
1922 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
1923 const char *ssid, int ssid_len)
1924 {
1925 int tmp, hidden_ssid;
1926
1927 if (ssid_len == ifsta->ssid_len &&
1928 !memcmp(ifsta->ssid, ssid, ssid_len))
1929 return 1;
1930
1931 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1932 return 0;
1933
1934 hidden_ssid = 1;
1935 tmp = ssid_len;
1936 while (tmp--) {
1937 if (ssid[tmp] != '\0') {
1938 hidden_ssid = 0;
1939 break;
1940 }
1941 }
1942
1943 if (hidden_ssid && ifsta->ssid_len == ssid_len)
1944 return 1;
1945
1946 if (ssid_len == 1 && ssid[0] == ' ')
1947 return 1;
1948
1949 return 0;
1950 }
1951
1952 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
1953 struct ieee80211_if_sta *ifsta)
1954 {
1955 struct ieee80211_local *local = sdata->local;
1956 struct ieee80211_bss *bss;
1957 struct ieee80211_supported_band *sband;
1958 u8 bssid[ETH_ALEN], *pos;
1959 int i;
1960 int ret;
1961 DECLARE_MAC_BUF(mac);
1962
1963 #if 0
1964 /* Easier testing, use fixed BSSID. */
1965 memset(bssid, 0xfe, ETH_ALEN);
1966 #else
1967 /* Generate random, not broadcast, locally administered BSSID. Mix in
1968 * own MAC address to make sure that devices that do not have proper
1969 * random number generator get different BSSID. */
1970 get_random_bytes(bssid, ETH_ALEN);
1971 for (i = 0; i < ETH_ALEN; i++)
1972 bssid[i] ^= sdata->dev->dev_addr[i];
1973 bssid[0] &= ~0x01;
1974 bssid[0] |= 0x02;
1975 #endif
1976
1977 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
1978 sdata->dev->name, print_mac(mac, bssid));
1979
1980 bss = ieee80211_rx_bss_add(local, bssid,
1981 local->hw.conf.channel->center_freq,
1982 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
1983 if (!bss)
1984 return -ENOMEM;
1985
1986 bss->band = local->hw.conf.channel->band;
1987 sband = local->hw.wiphy->bands[bss->band];
1988
1989 if (local->hw.conf.beacon_int == 0)
1990 local->hw.conf.beacon_int = 100;
1991 bss->beacon_int = local->hw.conf.beacon_int;
1992 bss->last_update = jiffies;
1993 bss->capability = WLAN_CAPABILITY_IBSS;
1994
1995 if (sdata->default_key)
1996 bss->capability |= WLAN_CAPABILITY_PRIVACY;
1997 else
1998 sdata->drop_unencrypted = 0;
1999
2000 bss->supp_rates_len = sband->n_bitrates;
2001 pos = bss->supp_rates;
2002 for (i = 0; i < sband->n_bitrates; i++) {
2003 int rate = sband->bitrates[i].bitrate;
2004 *pos++ = (u8) (rate / 5);
2005 }
2006
2007 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2008 ieee80211_rx_bss_put(local, bss);
2009 return ret;
2010 }
2011
2012
2013 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2014 struct ieee80211_if_sta *ifsta)
2015 {
2016 struct ieee80211_local *local = sdata->local;
2017 struct ieee80211_bss *bss;
2018 int found = 0;
2019 u8 bssid[ETH_ALEN];
2020 int active_ibss;
2021 DECLARE_MAC_BUF(mac);
2022 DECLARE_MAC_BUF(mac2);
2023
2024 if (ifsta->ssid_len == 0)
2025 return -EINVAL;
2026
2027 active_ibss = ieee80211_sta_active_ibss(sdata);
2028 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2029 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2030 sdata->dev->name, active_ibss);
2031 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2032 spin_lock_bh(&local->bss_lock);
2033 list_for_each_entry(bss, &local->bss_list, list) {
2034 if (ifsta->ssid_len != bss->ssid_len ||
2035 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2036 || !(bss->capability & WLAN_CAPABILITY_IBSS))
2037 continue;
2038 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2039 printk(KERN_DEBUG " bssid=%s found\n",
2040 print_mac(mac, bss->bssid));
2041 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2042 memcpy(bssid, bss->bssid, ETH_ALEN);
2043 found = 1;
2044 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2045 break;
2046 }
2047 spin_unlock_bh(&local->bss_lock);
2048
2049 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2050 if (found)
2051 printk(KERN_DEBUG " sta_find_ibss: selected %s current "
2052 "%s\n", print_mac(mac, bssid),
2053 print_mac(mac2, ifsta->bssid));
2054 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2055
2056 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2057 int ret;
2058 int search_freq;
2059
2060 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2061 search_freq = bss->freq;
2062 else
2063 search_freq = local->hw.conf.channel->center_freq;
2064
2065 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2066 ifsta->ssid, ifsta->ssid_len);
2067 if (!bss)
2068 goto dont_join;
2069
2070 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
2071 " based on configured SSID\n",
2072 sdata->dev->name, print_mac(mac, bssid));
2073 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2074 ieee80211_rx_bss_put(local, bss);
2075 return ret;
2076 }
2077
2078 dont_join:
2079 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2080 printk(KERN_DEBUG " did not try to join ibss\n");
2081 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2082
2083 /* Selected IBSS not found in current scan results - try to scan */
2084 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2085 !ieee80211_sta_active_ibss(sdata)) {
2086 mod_timer(&ifsta->timer, jiffies +
2087 IEEE80211_IBSS_MERGE_INTERVAL);
2088 } else if (time_after(jiffies, local->last_scan_completed +
2089 IEEE80211_SCAN_INTERVAL)) {
2090 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2091 "join\n", sdata->dev->name);
2092 return ieee80211_request_scan(sdata, ifsta->ssid,
2093 ifsta->ssid_len);
2094 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2095 int interval = IEEE80211_SCAN_INTERVAL;
2096
2097 if (time_after(jiffies, ifsta->ibss_join_req +
2098 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2099 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2100 (!(local->oper_channel->flags &
2101 IEEE80211_CHAN_NO_IBSS)))
2102 return ieee80211_sta_create_ibss(sdata, ifsta);
2103 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2104 printk(KERN_DEBUG "%s: IBSS not allowed on"
2105 " %d MHz\n", sdata->dev->name,
2106 local->hw.conf.channel->center_freq);
2107 }
2108
2109 /* No IBSS found - decrease scan interval and continue
2110 * scanning. */
2111 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2112 }
2113
2114 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2115 mod_timer(&ifsta->timer, jiffies + interval);
2116 return 0;
2117 }
2118
2119 return 0;
2120 }
2121
2122
2123 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2124 struct ieee80211_if_sta *ifsta)
2125 {
2126 struct ieee80211_local *local = sdata->local;
2127 struct ieee80211_bss *bss, *selected = NULL;
2128 int top_rssi = 0, freq;
2129
2130 spin_lock_bh(&local->bss_lock);
2131 freq = local->oper_channel->center_freq;
2132 list_for_each_entry(bss, &local->bss_list, list) {
2133 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2134 continue;
2135
2136 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2137 IEEE80211_STA_AUTO_BSSID_SEL |
2138 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2139 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2140 !!sdata->default_key))
2141 continue;
2142
2143 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2144 bss->freq != freq)
2145 continue;
2146
2147 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2148 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2149 continue;
2150
2151 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2152 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2153 continue;
2154
2155 if (!selected || top_rssi < bss->signal) {
2156 selected = bss;
2157 top_rssi = bss->signal;
2158 }
2159 }
2160 if (selected)
2161 atomic_inc(&selected->users);
2162 spin_unlock_bh(&local->bss_lock);
2163
2164 if (selected) {
2165 ieee80211_set_freq(sdata, selected->freq);
2166 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2167 ieee80211_sta_set_ssid(sdata, selected->ssid,
2168 selected->ssid_len);
2169 ieee80211_sta_set_bssid(sdata, selected->bssid);
2170 ieee80211_sta_def_wmm_params(sdata, selected);
2171
2172 /* Send out direct probe if no probe resp was received or
2173 * the one we have is outdated
2174 */
2175 if (!selected->last_probe_resp ||
2176 time_after(jiffies, selected->last_probe_resp
2177 + IEEE80211_SCAN_RESULT_EXPIRE))
2178 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2179 else
2180 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2181
2182 ieee80211_rx_bss_put(local, selected);
2183 ieee80211_sta_reset_auth(sdata, ifsta);
2184 return 0;
2185 } else {
2186 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2187 ifsta->assoc_scan_tries++;
2188 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2189 ieee80211_start_scan(sdata, NULL, 0);
2190 else
2191 ieee80211_start_scan(sdata, ifsta->ssid,
2192 ifsta->ssid_len);
2193 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2194 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2195 } else
2196 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2197 }
2198 return -1;
2199 }
2200
2201
2202 static void ieee80211_sta_work(struct work_struct *work)
2203 {
2204 struct ieee80211_sub_if_data *sdata =
2205 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2206 struct ieee80211_local *local = sdata->local;
2207 struct ieee80211_if_sta *ifsta;
2208 struct sk_buff *skb;
2209
2210 if (!netif_running(sdata->dev))
2211 return;
2212
2213 if (local->sw_scanning || local->hw_scanning)
2214 return;
2215
2216 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2217 sdata->vif.type != NL80211_IFTYPE_ADHOC))
2218 return;
2219 ifsta = &sdata->u.sta;
2220
2221 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2222 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2223
2224 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2225 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2226 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2227 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2228 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2229 ifsta->scan_ssid_len);
2230 return;
2231 }
2232
2233 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2234 if (ieee80211_sta_config_auth(sdata, ifsta))
2235 return;
2236 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2237 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2238 return;
2239
2240 switch (ifsta->state) {
2241 case IEEE80211_STA_MLME_DISABLED:
2242 break;
2243 case IEEE80211_STA_MLME_DIRECT_PROBE:
2244 ieee80211_direct_probe(sdata, ifsta);
2245 break;
2246 case IEEE80211_STA_MLME_AUTHENTICATE:
2247 ieee80211_authenticate(sdata, ifsta);
2248 break;
2249 case IEEE80211_STA_MLME_ASSOCIATE:
2250 ieee80211_associate(sdata, ifsta);
2251 break;
2252 case IEEE80211_STA_MLME_ASSOCIATED:
2253 ieee80211_associated(sdata, ifsta);
2254 break;
2255 case IEEE80211_STA_MLME_IBSS_SEARCH:
2256 ieee80211_sta_find_ibss(sdata, ifsta);
2257 break;
2258 case IEEE80211_STA_MLME_IBSS_JOINED:
2259 ieee80211_sta_merge_ibss(sdata, ifsta);
2260 break;
2261 default:
2262 WARN_ON(1);
2263 break;
2264 }
2265
2266 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2267 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2268 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2269
2270 ieee80211_set_disassoc(sdata, ifsta, false, true,
2271 WLAN_REASON_UNSPECIFIED);
2272 }
2273 }
2274
2275 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2276 {
2277 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2278 queue_work(sdata->local->hw.workqueue,
2279 &sdata->u.sta.work);
2280 }
2281
2282 /* interface setup */
2283 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2284 {
2285 struct ieee80211_if_sta *ifsta;
2286
2287 ifsta = &sdata->u.sta;
2288 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2289 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2290 (unsigned long) sdata);
2291 skb_queue_head_init(&ifsta->skb_queue);
2292
2293 ifsta->capab = WLAN_CAPABILITY_ESS;
2294 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2295 IEEE80211_AUTH_ALG_SHARED_KEY;
2296 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2297 IEEE80211_STA_AUTO_BSSID_SEL |
2298 IEEE80211_STA_AUTO_CHANNEL_SEL;
2299 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2300 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2301 }
2302
2303 /*
2304 * Add a new IBSS station, will also be called by the RX code when,
2305 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2306 * must be callable in atomic context.
2307 */
2308 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2309 struct sk_buff *skb, u8 *bssid,
2310 u8 *addr, u64 supp_rates)
2311 {
2312 struct ieee80211_local *local = sdata->local;
2313 struct sta_info *sta;
2314 DECLARE_MAC_BUF(mac);
2315 int band = local->hw.conf.channel->band;
2316
2317 /* TODO: Could consider removing the least recently used entry and
2318 * allow new one to be added. */
2319 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2320 if (net_ratelimit()) {
2321 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2322 "entry %s\n", sdata->dev->name, print_mac(mac, addr));
2323 }
2324 return NULL;
2325 }
2326
2327 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2328 return NULL;
2329
2330 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2331 printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
2332 wiphy_name(local->hw.wiphy), print_mac(mac, addr), sdata->dev->name);
2333 #endif
2334
2335 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2336 if (!sta)
2337 return NULL;
2338
2339 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2340
2341 /* make sure mandatory rates are always added */
2342 sta->supp_rates[band] = supp_rates |
2343 ieee80211_mandatory_rates(local, band);
2344
2345 rate_control_rate_init(sta, local);
2346
2347 if (sta_info_insert(sta))
2348 return NULL;
2349
2350 return sta;
2351 }
2352
2353 /* configuration hooks */
2354 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2355 struct ieee80211_if_sta *ifsta)
2356 {
2357 struct ieee80211_local *local = sdata->local;
2358
2359 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2360 return;
2361
2362 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2363 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2364 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2365 IEEE80211_STA_AUTO_SSID_SEL))) {
2366
2367 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2368 ieee80211_set_disassoc(sdata, ifsta, true, true,
2369 WLAN_REASON_DEAUTH_LEAVING);
2370
2371 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2372 queue_work(local->hw.workqueue, &ifsta->work);
2373 }
2374 }
2375
2376 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2377 {
2378 struct ieee80211_if_sta *ifsta;
2379 int res;
2380
2381 if (len > IEEE80211_MAX_SSID_LEN)
2382 return -EINVAL;
2383
2384 ifsta = &sdata->u.sta;
2385
2386 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2387 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2388 memcpy(ifsta->ssid, ssid, len);
2389 ifsta->ssid_len = len;
2390 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2391
2392 res = 0;
2393 /*
2394 * Hack! MLME code needs to be cleaned up to have different
2395 * entry points for configuration and internal selection change
2396 */
2397 if (netif_running(sdata->dev))
2398 res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
2399 if (res) {
2400 printk(KERN_DEBUG "%s: Failed to config new SSID to "
2401 "the low-level driver\n", sdata->dev->name);
2402 return res;
2403 }
2404 }
2405
2406 if (len)
2407 ifsta->flags |= IEEE80211_STA_SSID_SET;
2408 else
2409 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2410
2411 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2412 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2413 ifsta->ibss_join_req = jiffies;
2414 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2415 return ieee80211_sta_find_ibss(sdata, ifsta);
2416 }
2417
2418 return 0;
2419 }
2420
2421 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2422 {
2423 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2424 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2425 *len = ifsta->ssid_len;
2426 return 0;
2427 }
2428
2429 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2430 {
2431 struct ieee80211_if_sta *ifsta;
2432 int res;
2433
2434 ifsta = &sdata->u.sta;
2435
2436 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2437 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2438 res = 0;
2439 /*
2440 * Hack! See also ieee80211_sta_set_ssid.
2441 */
2442 if (netif_running(sdata->dev))
2443 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2444 if (res) {
2445 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2446 "the low-level driver\n", sdata->dev->name);
2447 return res;
2448 }
2449 }
2450
2451 if (is_valid_ether_addr(bssid))
2452 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2453 else
2454 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2455
2456 return 0;
2457 }
2458
2459 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2460 {
2461 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2462
2463 kfree(ifsta->extra_ie);
2464 if (len == 0) {
2465 ifsta->extra_ie = NULL;
2466 ifsta->extra_ie_len = 0;
2467 return 0;
2468 }
2469 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2470 if (!ifsta->extra_ie) {
2471 ifsta->extra_ie_len = 0;
2472 return -ENOMEM;
2473 }
2474 memcpy(ifsta->extra_ie, ie, len);
2475 ifsta->extra_ie_len = len;
2476 return 0;
2477 }
2478
2479 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2480 {
2481 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2482
2483 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2484 sdata->dev->name, reason);
2485
2486 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2487 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2488 return -EINVAL;
2489
2490 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2491 return 0;
2492 }
2493
2494 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2495 {
2496 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2497
2498 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2499 sdata->dev->name, reason);
2500
2501 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2502 return -EINVAL;
2503
2504 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2505 return -1;
2506
2507 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2508 return 0;
2509 }
2510
2511 /* scan finished notification */
2512 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2513 {
2514 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2515 struct ieee80211_if_sta *ifsta;
2516
2517 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2518 ifsta = &sdata->u.sta;
2519 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2520 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2521 !ieee80211_sta_active_ibss(sdata)))
2522 ieee80211_sta_find_ibss(sdata, ifsta);
2523 }
2524
2525 /* Restart STA timers */
2526 rcu_read_lock();
2527 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2528 ieee80211_restart_sta_timer(sdata);
2529 rcu_read_unlock();
2530 }
2531
2532 /* driver notification call */
2533 void ieee80211_notify_mac(struct ieee80211_hw *hw,
2534 enum ieee80211_notification_types notif_type)
2535 {
2536 struct ieee80211_local *local = hw_to_local(hw);
2537 struct ieee80211_sub_if_data *sdata;
2538
2539 switch (notif_type) {
2540 case IEEE80211_NOTIFY_RE_ASSOC:
2541 rcu_read_lock();
2542 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2543 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2544 continue;
2545
2546 ieee80211_sta_req_auth(sdata, &sdata->u.sta);
2547 }
2548 rcu_read_unlock();
2549 break;
2550 }
2551 }
2552 EXPORT_SYMBOL(ieee80211_notify_mac);
Linux kernel - Deliverables
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