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mac80211: Look out for some other AP when disassoc is received.
[linux-2.6/mini2440.git] / net / mac80211 / mlme.c
blob7600ac9b87fecf8e34c4ff05a38b4cab0d209ca5
1 /*
2 * BSS client mode implementation
3 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/wireless.h>
19 #include <linux/random.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/iw_handler.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
32 #define IEEE80211_AUTH_MAX_TRIES 3
33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
34 #define IEEE80211_ASSOC_MAX_TRIES 3
35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
36 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
38 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
41
42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
44
45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
46
47
48 /* utils */
49 static int ecw2cw(int ecw)
50 {
51 return (1 << ecw) - 1;
52 }
53
54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
55 {
56 u8 *end, *pos;
57
58 pos = bss->ies;
59 if (pos == NULL)
60 return NULL;
61 end = pos + bss->ies_len;
62
63 while (pos + 1 < end) {
64 if (pos + 2 + pos[1] > end)
65 break;
66 if (pos[0] == ie)
67 return pos;
68 pos += 2 + pos[1];
69 }
70
71 return NULL;
72 }
73
74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
75 struct ieee80211_supported_band *sband,
76 u64 *rates)
77 {
78 int i, j, count;
79 *rates = 0;
80 count = 0;
81 for (i = 0; i < bss->supp_rates_len; i++) {
82 int rate = (bss->supp_rates[i] & 0x7F) * 5;
83
84 for (j = 0; j < sband->n_bitrates; j++)
85 if (sband->bitrates[j].bitrate == rate) {
86 *rates |= BIT(j);
87 count++;
88 break;
89 }
90 }
91
92 return count;
93 }
94
95 /* also used by mesh code */
96 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
97 struct ieee802_11_elems *elems,
98 enum ieee80211_band band)
99 {
100 struct ieee80211_supported_band *sband;
101 struct ieee80211_rate *bitrates;
102 size_t num_rates;
103 u64 supp_rates;
104 int i, j;
105 sband = local->hw.wiphy->bands[band];
106
107 if (!sband) {
108 WARN_ON(1);
109 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
110 }
111
112 bitrates = sband->bitrates;
113 num_rates = sband->n_bitrates;
114 supp_rates = 0;
115 for (i = 0; i < elems->supp_rates_len +
116 elems->ext_supp_rates_len; i++) {
117 u8 rate = 0;
118 int own_rate;
119 if (i < elems->supp_rates_len)
120 rate = elems->supp_rates[i];
121 else if (elems->ext_supp_rates)
122 rate = elems->ext_supp_rates
123 [i - elems->supp_rates_len];
124 own_rate = 5 * (rate & 0x7f);
125 for (j = 0; j < num_rates; j++)
126 if (bitrates[j].bitrate == own_rate)
127 supp_rates |= BIT(j);
128 }
129 return supp_rates;
130 }
131
132 /* frame sending functions */
133
134 /* also used by scanning code */
135 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
136 u8 *ssid, size_t ssid_len)
137 {
138 struct ieee80211_local *local = sdata->local;
139 struct ieee80211_supported_band *sband;
140 struct sk_buff *skb;
141 struct ieee80211_mgmt *mgmt;
142 u8 *pos, *supp_rates, *esupp_rates = NULL;
143 int i;
144
145 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
146 if (!skb) {
147 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
148 "request\n", sdata->dev->name);
149 return;
150 }
151 skb_reserve(skb, local->hw.extra_tx_headroom);
152
153 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
154 memset(mgmt, 0, 24);
155 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
156 IEEE80211_STYPE_PROBE_REQ);
157 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
158 if (dst) {
159 memcpy(mgmt->da, dst, ETH_ALEN);
160 memcpy(mgmt->bssid, dst, ETH_ALEN);
161 } else {
162 memset(mgmt->da, 0xff, ETH_ALEN);
163 memset(mgmt->bssid, 0xff, ETH_ALEN);
164 }
165 pos = skb_put(skb, 2 + ssid_len);
166 *pos++ = WLAN_EID_SSID;
167 *pos++ = ssid_len;
168 memcpy(pos, ssid, ssid_len);
169
170 supp_rates = skb_put(skb, 2);
171 supp_rates[0] = WLAN_EID_SUPP_RATES;
172 supp_rates[1] = 0;
173 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
174
175 for (i = 0; i < sband->n_bitrates; i++) {
176 struct ieee80211_rate *rate = &sband->bitrates[i];
177 if (esupp_rates) {
178 pos = skb_put(skb, 1);
179 esupp_rates[1]++;
180 } else if (supp_rates[1] == 8) {
181 esupp_rates = skb_put(skb, 3);
182 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
183 esupp_rates[1] = 1;
184 pos = &esupp_rates[2];
185 } else {
186 pos = skb_put(skb, 1);
187 supp_rates[1]++;
188 }
189 *pos = rate->bitrate / 5;
190 }
191
192 ieee80211_tx_skb(sdata, skb, 0);
193 }
194
195 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
196 struct ieee80211_if_sta *ifsta,
197 int transaction, u8 *extra, size_t extra_len,
198 int encrypt)
199 {
200 struct ieee80211_local *local = sdata->local;
201 struct sk_buff *skb;
202 struct ieee80211_mgmt *mgmt;
203
204 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
205 sizeof(*mgmt) + 6 + extra_len);
206 if (!skb) {
207 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
208 "frame\n", sdata->dev->name);
209 return;
210 }
211 skb_reserve(skb, local->hw.extra_tx_headroom);
212
213 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
214 memset(mgmt, 0, 24 + 6);
215 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
216 IEEE80211_STYPE_AUTH);
217 if (encrypt)
218 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
219 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
220 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
221 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
222 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
223 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
224 ifsta->auth_transaction = transaction + 1;
225 mgmt->u.auth.status_code = cpu_to_le16(0);
226 if (extra)
227 memcpy(skb_put(skb, extra_len), extra, extra_len);
228
229 ieee80211_tx_skb(sdata, skb, encrypt);
230 }
231
232 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
233 struct ieee80211_if_sta *ifsta)
234 {
235 struct ieee80211_local *local = sdata->local;
236 struct sk_buff *skb;
237 struct ieee80211_mgmt *mgmt;
238 u8 *pos, *ies, *ht_ie;
239 int i, len, count, rates_len, supp_rates_len;
240 u16 capab;
241 struct ieee80211_bss *bss;
242 int wmm = 0;
243 struct ieee80211_supported_band *sband;
244 u64 rates = 0;
245
246 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
247 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
248 ifsta->ssid_len);
249 if (!skb) {
250 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
251 "frame\n", sdata->dev->name);
252 return;
253 }
254 skb_reserve(skb, local->hw.extra_tx_headroom);
255
256 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
257
258 capab = ifsta->capab;
259
260 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
261 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
262 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
263 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
264 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
265 }
266
267 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
268 local->hw.conf.channel->center_freq,
269 ifsta->ssid, ifsta->ssid_len);
270 if (bss) {
271 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
272 capab |= WLAN_CAPABILITY_PRIVACY;
273 if (bss->wmm_used)
274 wmm = 1;
275
276 /* get all rates supported by the device and the AP as
277 * some APs don't like getting a superset of their rates
278 * in the association request (e.g. D-Link DAP 1353 in
279 * b-only mode) */
280 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
281
282 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
283 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
284 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
285
286 ieee80211_rx_bss_put(local, bss);
287 } else {
288 rates = ~0;
289 rates_len = sband->n_bitrates;
290 }
291
292 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
293 memset(mgmt, 0, 24);
294 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
295 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
296 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
297
298 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
299 skb_put(skb, 10);
300 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
301 IEEE80211_STYPE_REASSOC_REQ);
302 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
303 mgmt->u.reassoc_req.listen_interval =
304 cpu_to_le16(local->hw.conf.listen_interval);
305 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
306 ETH_ALEN);
307 } else {
308 skb_put(skb, 4);
309 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
310 IEEE80211_STYPE_ASSOC_REQ);
311 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
312 mgmt->u.reassoc_req.listen_interval =
313 cpu_to_le16(local->hw.conf.listen_interval);
314 }
315
316 /* SSID */
317 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
318 *pos++ = WLAN_EID_SSID;
319 *pos++ = ifsta->ssid_len;
320 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
321
322 /* add all rates which were marked to be used above */
323 supp_rates_len = rates_len;
324 if (supp_rates_len > 8)
325 supp_rates_len = 8;
326
327 len = sband->n_bitrates;
328 pos = skb_put(skb, supp_rates_len + 2);
329 *pos++ = WLAN_EID_SUPP_RATES;
330 *pos++ = supp_rates_len;
331
332 count = 0;
333 for (i = 0; i < sband->n_bitrates; i++) {
334 if (BIT(i) & rates) {
335 int rate = sband->bitrates[i].bitrate;
336 *pos++ = (u8) (rate / 5);
337 if (++count == 8)
338 break;
339 }
340 }
341
342 if (rates_len > count) {
343 pos = skb_put(skb, rates_len - count + 2);
344 *pos++ = WLAN_EID_EXT_SUPP_RATES;
345 *pos++ = rates_len - count;
346
347 for (i++; i < sband->n_bitrates; i++) {
348 if (BIT(i) & rates) {
349 int rate = sband->bitrates[i].bitrate;
350 *pos++ = (u8) (rate / 5);
351 }
352 }
353 }
354
355 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
356 /* 1. power capabilities */
357 pos = skb_put(skb, 4);
358 *pos++ = WLAN_EID_PWR_CAPABILITY;
359 *pos++ = 2;
360 *pos++ = 0; /* min tx power */
361 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
362
363 /* 2. supported channels */
364 /* TODO: get this in reg domain format */
365 pos = skb_put(skb, 2 * sband->n_channels + 2);
366 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
367 *pos++ = 2 * sband->n_channels;
368 for (i = 0; i < sband->n_channels; i++) {
369 *pos++ = ieee80211_frequency_to_channel(
370 sband->channels[i].center_freq);
371 *pos++ = 1; /* one channel in the subband*/
372 }
373 }
374
375 if (ifsta->extra_ie) {
376 pos = skb_put(skb, ifsta->extra_ie_len);
377 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
378 }
379
380 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
381 pos = skb_put(skb, 9);
382 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
383 *pos++ = 7; /* len */
384 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
385 *pos++ = 0x50;
386 *pos++ = 0xf2;
387 *pos++ = 2; /* WME */
388 *pos++ = 0; /* WME info */
389 *pos++ = 1; /* WME ver */
390 *pos++ = 0;
391 }
392
393 /* wmm support is a must to HT */
394 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
395 sband->ht_cap.ht_supported &&
396 (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
397 ht_ie[1] >= sizeof(struct ieee80211_ht_info)) {
398 struct ieee80211_ht_info *ht_info =
399 (struct ieee80211_ht_info *)(ht_ie + 2);
400 u16 cap = sband->ht_cap.cap;
401 __le16 tmp;
402 u32 flags = local->hw.conf.channel->flags;
403
404 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
405 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
406 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
407 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
408 cap &= ~IEEE80211_HT_CAP_SGI_40;
409 }
410 break;
411 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
412 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
413 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
414 cap &= ~IEEE80211_HT_CAP_SGI_40;
415 }
416 break;
417 }
418
419 tmp = cpu_to_le16(cap);
420 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
421 *pos++ = WLAN_EID_HT_CAPABILITY;
422 *pos++ = sizeof(struct ieee80211_ht_cap);
423 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
424 memcpy(pos, &tmp, sizeof(u16));
425 pos += sizeof(u16);
426 /* TODO: needs a define here for << 2 */
427 *pos++ = sband->ht_cap.ampdu_factor |
428 (sband->ht_cap.ampdu_density << 2);
429 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
430 }
431
432 kfree(ifsta->assocreq_ies);
433 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
434 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
435 if (ifsta->assocreq_ies)
436 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
437
438 ieee80211_tx_skb(sdata, skb, 0);
439 }
440
441
442 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
443 u16 stype, u16 reason)
444 {
445 struct ieee80211_local *local = sdata->local;
446 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
447 struct sk_buff *skb;
448 struct ieee80211_mgmt *mgmt;
449
450 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
451 if (!skb) {
452 printk(KERN_DEBUG "%s: failed to allocate buffer for "
453 "deauth/disassoc frame\n", sdata->dev->name);
454 return;
455 }
456 skb_reserve(skb, local->hw.extra_tx_headroom);
457
458 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
459 memset(mgmt, 0, 24);
460 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
461 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
462 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
463 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
464 skb_put(skb, 2);
465 /* u.deauth.reason_code == u.disassoc.reason_code */
466 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
467
468 ieee80211_tx_skb(sdata, skb, 0);
469 }
470
471 /* MLME */
472 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
473 struct ieee80211_bss *bss)
474 {
475 struct ieee80211_local *local = sdata->local;
476 int i, have_higher_than_11mbit = 0;
477
478 /* cf. IEEE 802.11 9.2.12 */
479 for (i = 0; i < bss->supp_rates_len; i++)
480 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
481 have_higher_than_11mbit = 1;
482
483 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
484 have_higher_than_11mbit)
485 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
486 else
487 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
488
489 ieee80211_set_wmm_default(sdata);
490 }
491
492 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
493 struct ieee80211_if_sta *ifsta,
494 u8 *wmm_param, size_t wmm_param_len)
495 {
496 struct ieee80211_tx_queue_params params;
497 size_t left;
498 int count;
499 u8 *pos;
500
501 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
502 return;
503
504 if (!wmm_param)
505 return;
506
507 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
508 return;
509 count = wmm_param[6] & 0x0f;
510 if (count == ifsta->wmm_last_param_set)
511 return;
512 ifsta->wmm_last_param_set = count;
513
514 pos = wmm_param + 8;
515 left = wmm_param_len - 8;
516
517 memset(&params, 0, sizeof(params));
518
519 if (!local->ops->conf_tx)
520 return;
521
522 local->wmm_acm = 0;
523 for (; left >= 4; left -= 4, pos += 4) {
524 int aci = (pos[0] >> 5) & 0x03;
525 int acm = (pos[0] >> 4) & 0x01;
526 int queue;
527
528 switch (aci) {
529 case 1:
530 queue = 3;
531 if (acm)
532 local->wmm_acm |= BIT(0) | BIT(3);
533 break;
534 case 2:
535 queue = 1;
536 if (acm)
537 local->wmm_acm |= BIT(4) | BIT(5);
538 break;
539 case 3:
540 queue = 0;
541 if (acm)
542 local->wmm_acm |= BIT(6) | BIT(7);
543 break;
544 case 0:
545 default:
546 queue = 2;
547 if (acm)
548 local->wmm_acm |= BIT(1) | BIT(2);
549 break;
550 }
551
552 params.aifs = pos[0] & 0x0f;
553 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
554 params.cw_min = ecw2cw(pos[1] & 0x0f);
555 params.txop = get_unaligned_le16(pos + 2);
556 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
557 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
558 "cWmin=%d cWmax=%d txop=%d\n",
559 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
560 params.cw_max, params.txop);
561 #endif
562 /* TODO: handle ACM (block TX, fallback to next lowest allowed
563 * AC for now) */
564 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
565 printk(KERN_DEBUG "%s: failed to set TX queue "
566 "parameters for queue %d\n", local->mdev->name, queue);
567 }
568 }
569 }
570
571 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
572 u16 capab, bool erp_valid, u8 erp)
573 {
574 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
575 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
576 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
577 #endif
578 u32 changed = 0;
579 bool use_protection;
580 bool use_short_preamble;
581 bool use_short_slot;
582
583 if (erp_valid) {
584 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
585 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
586 } else {
587 use_protection = false;
588 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
589 }
590
591 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
592
593 if (use_protection != bss_conf->use_cts_prot) {
594 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
595 if (net_ratelimit()) {
596 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
597 sdata->dev->name,
598 use_protection ? "enabled" : "disabled",
599 ifsta->bssid);
600 }
601 #endif
602 bss_conf->use_cts_prot = use_protection;
603 changed |= BSS_CHANGED_ERP_CTS_PROT;
604 }
605
606 if (use_short_preamble != bss_conf->use_short_preamble) {
607 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
608 if (net_ratelimit()) {
609 printk(KERN_DEBUG "%s: switched to %s barker preamble"
610 " (BSSID=%pM)\n",
611 sdata->dev->name,
612 use_short_preamble ? "short" : "long",
613 ifsta->bssid);
614 }
615 #endif
616 bss_conf->use_short_preamble = use_short_preamble;
617 changed |= BSS_CHANGED_ERP_PREAMBLE;
618 }
619
620 if (use_short_slot != bss_conf->use_short_slot) {
621 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
622 if (net_ratelimit()) {
623 printk(KERN_DEBUG "%s: switched to %s slot"
624 " (BSSID=%s)\n",
625 sdata->dev->name,
626 use_short_slot ? "short" : "long",
627 ifsta->bssid);
628 }
629 #endif
630 bss_conf->use_short_slot = use_short_slot;
631 changed |= BSS_CHANGED_ERP_SLOT;
632 }
633
634 return changed;
635 }
636
637 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
638 struct ieee80211_if_sta *ifsta)
639 {
640 union iwreq_data wrqu;
641 memset(&wrqu, 0, sizeof(wrqu));
642 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
643 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
644 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
645 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
646 }
647
648 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
649 struct ieee80211_if_sta *ifsta)
650 {
651 char *buf;
652 size_t len;
653 int i;
654 union iwreq_data wrqu;
655
656 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
657 return;
658
659 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
660 ifsta->assocresp_ies_len), GFP_KERNEL);
661 if (!buf)
662 return;
663
664 len = sprintf(buf, "ASSOCINFO(");
665 if (ifsta->assocreq_ies) {
666 len += sprintf(buf + len, "ReqIEs=");
667 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
668 len += sprintf(buf + len, "%02x",
669 ifsta->assocreq_ies[i]);
670 }
671 }
672 if (ifsta->assocresp_ies) {
673 if (ifsta->assocreq_ies)
674 len += sprintf(buf + len, " ");
675 len += sprintf(buf + len, "RespIEs=");
676 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
677 len += sprintf(buf + len, "%02x",
678 ifsta->assocresp_ies[i]);
679 }
680 }
681 len += sprintf(buf + len, ")");
682
683 if (len > IW_CUSTOM_MAX) {
684 len = sprintf(buf, "ASSOCRESPIE=");
685 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
686 len += sprintf(buf + len, "%02x",
687 ifsta->assocresp_ies[i]);
688 }
689 }
690
691 if (len <= IW_CUSTOM_MAX) {
692 memset(&wrqu, 0, sizeof(wrqu));
693 wrqu.data.length = len;
694 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
695 }
696
697 kfree(buf);
698 }
699
700
701 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
702 struct ieee80211_if_sta *ifsta,
703 u32 bss_info_changed)
704 {
705 struct ieee80211_local *local = sdata->local;
706 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
707
708 struct ieee80211_bss *bss;
709
710 bss_info_changed |= BSS_CHANGED_ASSOC;
711 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
712
713 if (sdata->vif.type != NL80211_IFTYPE_STATION)
714 return;
715
716 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
717 conf->channel->center_freq,
718 ifsta->ssid, ifsta->ssid_len);
719 if (bss) {
720 /* set timing information */
721 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
722 sdata->vif.bss_conf.timestamp = bss->timestamp;
723 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
724
725 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
726 bss->capability, bss->has_erp_value, bss->erp_value);
727
728 ieee80211_rx_bss_put(local, bss);
729 }
730
731 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
732 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
733 ieee80211_sta_send_associnfo(sdata, ifsta);
734
735 ifsta->last_probe = jiffies;
736 ieee80211_led_assoc(local, 1);
737
738 sdata->vif.bss_conf.assoc = 1;
739 /*
740 * For now just always ask the driver to update the basic rateset
741 * when we have associated, we aren't checking whether it actually
742 * changed or not.
743 */
744 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
745 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
746
747 netif_tx_start_all_queues(sdata->dev);
748 netif_carrier_on(sdata->dev);
749
750 ieee80211_sta_send_apinfo(sdata, ifsta);
751 }
752
753 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
754 struct ieee80211_if_sta *ifsta)
755 {
756 ifsta->direct_probe_tries++;
757 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
758 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
759 sdata->dev->name, ifsta->bssid);
760 ifsta->state = IEEE80211_STA_MLME_DISABLED;
761 ieee80211_sta_send_apinfo(sdata, ifsta);
762 return;
763 }
764
765 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
766 sdata->dev->name, ifsta->bssid,
767 ifsta->direct_probe_tries);
768
769 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
770
771 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
772
773 /* Direct probe is sent to broadcast address as some APs
774 * will not answer to direct packet in unassociated state.
775 */
776 ieee80211_send_probe_req(sdata, NULL,
777 ifsta->ssid, ifsta->ssid_len);
778
779 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
780 }
781
782
783 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
784 struct ieee80211_if_sta *ifsta)
785 {
786 ifsta->auth_tries++;
787 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
788 printk(KERN_DEBUG "%s: authentication with AP %pM"
789 " timed out\n",
790 sdata->dev->name, ifsta->bssid);
791 ifsta->state = IEEE80211_STA_MLME_DISABLED;
792 ieee80211_sta_send_apinfo(sdata, ifsta);
793 return;
794 }
795
796 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
797 printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
798 sdata->dev->name, ifsta->bssid);
799
800 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
801
802 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
803 }
804
805 /*
806 * The disassoc 'reason' argument can be either our own reason
807 * if self disconnected or a reason code from the AP.
808 */
809 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
810 struct ieee80211_if_sta *ifsta, bool deauth,
811 bool self_disconnected, u16 reason)
812 {
813 struct ieee80211_local *local = sdata->local;
814 struct sta_info *sta;
815 u32 changed = 0;
816
817 rcu_read_lock();
818
819 sta = sta_info_get(local, ifsta->bssid);
820 if (!sta) {
821 rcu_read_unlock();
822 return;
823 }
824
825 if (deauth) {
826 ifsta->direct_probe_tries = 0;
827 ifsta->auth_tries = 0;
828 }
829 ifsta->assoc_scan_tries = 0;
830 ifsta->assoc_tries = 0;
831
832 netif_tx_stop_all_queues(sdata->dev);
833 netif_carrier_off(sdata->dev);
834
835 ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
836
837 if (self_disconnected) {
838 if (deauth)
839 ieee80211_send_deauth_disassoc(sdata,
840 IEEE80211_STYPE_DEAUTH, reason);
841 else
842 ieee80211_send_deauth_disassoc(sdata,
843 IEEE80211_STYPE_DISASSOC, reason);
844 }
845
846 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
847 changed |= ieee80211_reset_erp_info(sdata);
848
849 ieee80211_led_assoc(local, 0);
850 changed |= BSS_CHANGED_ASSOC;
851 sdata->vif.bss_conf.assoc = false;
852
853 ieee80211_sta_send_apinfo(sdata, ifsta);
854
855 if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
856 ifsta->state = IEEE80211_STA_MLME_DISABLED;
857
858 sta_info_unlink(&sta);
859
860 rcu_read_unlock();
861
862 sta_info_destroy(sta);
863
864 local->hw.conf.ht.enabled = false;
865 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_HT);
866
867 ieee80211_bss_info_change_notify(sdata, changed);
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 ieee80211_sta_send_apinfo(sdata, ifsta);
918 return;
919 }
920
921 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
922 printk(KERN_DEBUG "%s: associate with AP %pM\n",
923 sdata->dev->name, ifsta->bssid);
924 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
925 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
926 "mixed-cell disabled - abort association\n", sdata->dev->name);
927 ifsta->state = IEEE80211_STA_MLME_DISABLED;
928 return;
929 }
930
931 ieee80211_send_assoc(sdata, ifsta);
932
933 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
934 }
935
936
937 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
938 struct ieee80211_if_sta *ifsta)
939 {
940 struct ieee80211_local *local = sdata->local;
941 struct sta_info *sta;
942 int disassoc;
943
944 /* TODO: start monitoring current AP signal quality and number of
945 * missed beacons. Scan other channels every now and then and search
946 * for better APs. */
947 /* TODO: remove expired BSSes */
948
949 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
950
951 rcu_read_lock();
952
953 sta = sta_info_get(local, ifsta->bssid);
954 if (!sta) {
955 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
956 sdata->dev->name, ifsta->bssid);
957 disassoc = 1;
958 } else {
959 disassoc = 0;
960 if (time_after(jiffies,
961 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
962 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
963 printk(KERN_DEBUG "%s: No ProbeResp from "
964 "current AP %pM - assume out of "
965 "range\n",
966 sdata->dev->name, ifsta->bssid);
967 disassoc = 1;
968 } else
969 ieee80211_send_probe_req(sdata, ifsta->bssid,
970 ifsta->ssid,
971 ifsta->ssid_len);
972 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
973 } else {
974 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
975 if (time_after(jiffies, ifsta->last_probe +
976 IEEE80211_PROBE_INTERVAL)) {
977 ifsta->last_probe = jiffies;
978 ieee80211_send_probe_req(sdata, ifsta->bssid,
979 ifsta->ssid,
980 ifsta->ssid_len);
981 }
982 }
983 }
984
985 rcu_read_unlock();
986
987 if (disassoc)
988 ieee80211_set_disassoc(sdata, ifsta, true, true,
989 WLAN_REASON_PREV_AUTH_NOT_VALID);
990 else
991 mod_timer(&ifsta->timer, jiffies +
992 IEEE80211_MONITORING_INTERVAL);
993 }
994
995
996 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
997 struct ieee80211_if_sta *ifsta)
998 {
999 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1000 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1001 ieee80211_associate(sdata, ifsta);
1002 }
1003
1004
1005 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1006 struct ieee80211_if_sta *ifsta,
1007 struct ieee80211_mgmt *mgmt,
1008 size_t len)
1009 {
1010 u8 *pos;
1011 struct ieee802_11_elems elems;
1012
1013 pos = mgmt->u.auth.variable;
1014 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1015 if (!elems.challenge)
1016 return;
1017 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1018 elems.challenge_len + 2, 1);
1019 }
1020
1021 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1022 struct ieee80211_if_sta *ifsta,
1023 struct ieee80211_mgmt *mgmt,
1024 size_t len)
1025 {
1026 u16 auth_alg, auth_transaction, status_code;
1027
1028 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1029 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1030 return;
1031
1032 if (len < 24 + 6)
1033 return;
1034
1035 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1036 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1037 return;
1038
1039 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1040 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1041 return;
1042
1043 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1044 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1045 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1046
1047 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1048 /*
1049 * IEEE 802.11 standard does not require authentication in IBSS
1050 * networks and most implementations do not seem to use it.
1051 * However, try to reply to authentication attempts if someone
1052 * has actually implemented this.
1053 */
1054 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1055 return;
1056 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1057 }
1058
1059 if (auth_alg != ifsta->auth_alg ||
1060 auth_transaction != ifsta->auth_transaction)
1061 return;
1062
1063 if (status_code != WLAN_STATUS_SUCCESS) {
1064 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1065 u8 algs[3];
1066 const int num_algs = ARRAY_SIZE(algs);
1067 int i, pos;
1068 algs[0] = algs[1] = algs[2] = 0xff;
1069 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1070 algs[0] = WLAN_AUTH_OPEN;
1071 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1072 algs[1] = WLAN_AUTH_SHARED_KEY;
1073 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1074 algs[2] = WLAN_AUTH_LEAP;
1075 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1076 pos = 0;
1077 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1078 pos = 1;
1079 else
1080 pos = 2;
1081 for (i = 0; i < num_algs; i++) {
1082 pos++;
1083 if (pos >= num_algs)
1084 pos = 0;
1085 if (algs[pos] == ifsta->auth_alg ||
1086 algs[pos] == 0xff)
1087 continue;
1088 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1089 !ieee80211_sta_wep_configured(sdata))
1090 continue;
1091 ifsta->auth_alg = algs[pos];
1092 break;
1093 }
1094 }
1095 return;
1096 }
1097
1098 switch (ifsta->auth_alg) {
1099 case WLAN_AUTH_OPEN:
1100 case WLAN_AUTH_LEAP:
1101 ieee80211_auth_completed(sdata, ifsta);
1102 break;
1103 case WLAN_AUTH_SHARED_KEY:
1104 if (ifsta->auth_transaction == 4)
1105 ieee80211_auth_completed(sdata, ifsta);
1106 else
1107 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1108 break;
1109 }
1110 }
1111
1112
1113 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1114 struct ieee80211_if_sta *ifsta,
1115 struct ieee80211_mgmt *mgmt,
1116 size_t len)
1117 {
1118 u16 reason_code;
1119
1120 if (len < 24 + 2)
1121 return;
1122
1123 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1124 return;
1125
1126 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1127
1128 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1129 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1130 sdata->dev->name, reason_code);
1131
1132 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1133 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1134 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1135 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1136 mod_timer(&ifsta->timer, jiffies +
1137 IEEE80211_RETRY_AUTH_INTERVAL);
1138 }
1139
1140 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1141 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1142 }
1143
1144
1145 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1146 struct ieee80211_if_sta *ifsta,
1147 struct ieee80211_mgmt *mgmt,
1148 size_t len)
1149 {
1150 u16 reason_code;
1151
1152 if (len < 24 + 2)
1153 return;
1154
1155 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1156 return;
1157
1158 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1159
1160 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1161 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1162 sdata->dev->name, reason_code);
1163
1164 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1165 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1166 mod_timer(&ifsta->timer, jiffies +
1167 IEEE80211_RETRY_AUTH_INTERVAL);
1168 }
1169
1170 ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1171 }
1172
1173
1174 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1175 struct ieee80211_if_sta *ifsta,
1176 struct ieee80211_mgmt *mgmt,
1177 size_t len,
1178 int reassoc)
1179 {
1180 struct ieee80211_local *local = sdata->local;
1181 struct ieee80211_supported_band *sband;
1182 struct sta_info *sta;
1183 u64 rates, basic_rates;
1184 u16 capab_info, status_code, aid;
1185 struct ieee802_11_elems elems;
1186 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1187 u8 *pos;
1188 u32 changed = 0;
1189 int i, j;
1190 bool have_higher_than_11mbit = false, newsta = false;
1191 u16 ap_ht_cap_flags;
1192
1193 /* AssocResp and ReassocResp have identical structure, so process both
1194 * of them in this function. */
1195
1196 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1197 return;
1198
1199 if (len < 24 + 6)
1200 return;
1201
1202 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1203 return;
1204
1205 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1206 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1207 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1208
1209 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1210 "status=%d aid=%d)\n",
1211 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1212 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1213
1214 if (status_code != WLAN_STATUS_SUCCESS) {
1215 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1216 sdata->dev->name, status_code);
1217 /* if this was a reassociation, ensure we try a "full"
1218 * association next time. This works around some broken APs
1219 * which do not correctly reject reassociation requests. */
1220 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1221 return;
1222 }
1223
1224 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1225 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1226 "set\n", sdata->dev->name, aid);
1227 aid &= ~(BIT(15) | BIT(14));
1228
1229 pos = mgmt->u.assoc_resp.variable;
1230 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1231
1232 if (!elems.supp_rates) {
1233 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1234 sdata->dev->name);
1235 return;
1236 }
1237
1238 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1239 ifsta->aid = aid;
1240 ifsta->ap_capab = capab_info;
1241
1242 kfree(ifsta->assocresp_ies);
1243 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1244 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1245 if (ifsta->assocresp_ies)
1246 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1247
1248 rcu_read_lock();
1249
1250 /* Add STA entry for the AP */
1251 sta = sta_info_get(local, ifsta->bssid);
1252 if (!sta) {
1253 struct ieee80211_bss *bss;
1254
1255 newsta = true;
1256
1257 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1258 if (!sta) {
1259 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1260 " the AP\n", sdata->dev->name);
1261 rcu_read_unlock();
1262 return;
1263 }
1264 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1265 local->hw.conf.channel->center_freq,
1266 ifsta->ssid, ifsta->ssid_len);
1267 if (bss) {
1268 sta->last_signal = bss->signal;
1269 sta->last_qual = bss->qual;
1270 sta->last_noise = bss->noise;
1271 ieee80211_rx_bss_put(local, bss);
1272 }
1273
1274 /* update new sta with its last rx activity */
1275 sta->last_rx = jiffies;
1276 }
1277
1278 /*
1279 * FIXME: Do we really need to update the sta_info's information here?
1280 * We already know about the AP (we found it in our list) so it
1281 * should already be filled with the right info, no?
1282 * As is stands, all this is racy because typically we assume
1283 * the information that is filled in here (except flags) doesn't
1284 * change while a STA structure is alive. As such, it should move
1285 * to between the sta_info_alloc() and sta_info_insert() above.
1286 */
1287
1288 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1289 WLAN_STA_AUTHORIZED);
1290
1291 rates = 0;
1292 basic_rates = 0;
1293 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1294
1295 for (i = 0; i < elems.supp_rates_len; i++) {
1296 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1297 bool is_basic = !!(elems.supp_rates[i] & 0x80);
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 (is_basic)
1306 basic_rates |= BIT(j);
1307 break;
1308 }
1309 }
1310 }
1311
1312 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1313 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1314 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1315
1316 if (rate > 110)
1317 have_higher_than_11mbit = true;
1318
1319 for (j = 0; j < sband->n_bitrates; j++) {
1320 if (sband->bitrates[j].bitrate == rate) {
1321 rates |= BIT(j);
1322 if (is_basic)
1323 basic_rates |= BIT(j);
1324 break;
1325 }
1326 }
1327 }
1328
1329 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1330 sdata->vif.bss_conf.basic_rates = basic_rates;
1331
1332 /* cf. IEEE 802.11 9.2.12 */
1333 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1334 have_higher_than_11mbit)
1335 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1336 else
1337 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1338
1339 if (elems.ht_cap_elem)
1340 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1341 elems.ht_cap_elem, &sta->sta.ht_cap);
1342
1343 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1344
1345 rate_control_rate_init(sta);
1346
1347 if (elems.wmm_param)
1348 set_sta_flags(sta, WLAN_STA_WME);
1349
1350 if (newsta) {
1351 int err = sta_info_insert(sta);
1352 if (err) {
1353 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1354 " the AP (error %d)\n", sdata->dev->name, err);
1355 rcu_read_unlock();
1356 return;
1357 }
1358 }
1359
1360 rcu_read_unlock();
1361
1362 if (elems.wmm_param)
1363 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1364 elems.wmm_param_len);
1365
1366 if (elems.ht_info_elem && elems.wmm_param &&
1367 (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1368 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1369 ap_ht_cap_flags);
1370
1371 /* set AID and assoc capability,
1372 * ieee80211_set_associated() will tell the driver */
1373 bss_conf->aid = aid;
1374 bss_conf->assoc_capability = capab_info;
1375 ieee80211_set_associated(sdata, ifsta, changed);
1376
1377 ieee80211_associated(sdata, ifsta);
1378 }
1379
1380
1381 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1382 struct ieee80211_if_sta *ifsta,
1383 struct ieee80211_bss *bss)
1384 {
1385 struct ieee80211_local *local = sdata->local;
1386 int res, rates, i, j;
1387 struct sk_buff *skb;
1388 struct ieee80211_mgmt *mgmt;
1389 u8 *pos;
1390 struct ieee80211_supported_band *sband;
1391 union iwreq_data wrqu;
1392
1393 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1394 if (!skb) {
1395 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1396 "response\n", sdata->dev->name);
1397 return -ENOMEM;
1398 }
1399
1400 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1401
1402 /* Remove possible STA entries from other IBSS networks. */
1403 sta_info_flush_delayed(sdata);
1404
1405 if (local->ops->reset_tsf) {
1406 /* Reset own TSF to allow time synchronization work. */
1407 local->ops->reset_tsf(local_to_hw(local));
1408 }
1409 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1410 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1411 if (res)
1412 return res;
1413
1414 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1415
1416 sdata->drop_unencrypted = bss->capability &
1417 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1418
1419 res = ieee80211_set_freq(sdata, bss->freq);
1420
1421 if (res)
1422 return res;
1423
1424 /* Build IBSS probe response */
1425
1426 skb_reserve(skb, local->hw.extra_tx_headroom);
1427
1428 mgmt = (struct ieee80211_mgmt *)
1429 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1430 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1431 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1432 IEEE80211_STYPE_PROBE_RESP);
1433 memset(mgmt->da, 0xff, ETH_ALEN);
1434 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1435 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1436 mgmt->u.beacon.beacon_int =
1437 cpu_to_le16(local->hw.conf.beacon_int);
1438 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1439 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1440
1441 pos = skb_put(skb, 2 + ifsta->ssid_len);
1442 *pos++ = WLAN_EID_SSID;
1443 *pos++ = ifsta->ssid_len;
1444 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1445
1446 rates = bss->supp_rates_len;
1447 if (rates > 8)
1448 rates = 8;
1449 pos = skb_put(skb, 2 + rates);
1450 *pos++ = WLAN_EID_SUPP_RATES;
1451 *pos++ = rates;
1452 memcpy(pos, bss->supp_rates, rates);
1453
1454 if (bss->band == IEEE80211_BAND_2GHZ) {
1455 pos = skb_put(skb, 2 + 1);
1456 *pos++ = WLAN_EID_DS_PARAMS;
1457 *pos++ = 1;
1458 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1459 }
1460
1461 pos = skb_put(skb, 2 + 2);
1462 *pos++ = WLAN_EID_IBSS_PARAMS;
1463 *pos++ = 2;
1464 /* FIX: set ATIM window based on scan results */
1465 *pos++ = 0;
1466 *pos++ = 0;
1467
1468 if (bss->supp_rates_len > 8) {
1469 rates = bss->supp_rates_len - 8;
1470 pos = skb_put(skb, 2 + rates);
1471 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1472 *pos++ = rates;
1473 memcpy(pos, &bss->supp_rates[8], rates);
1474 }
1475
1476 ifsta->probe_resp = skb;
1477
1478 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1479
1480
1481 rates = 0;
1482 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1483 for (i = 0; i < bss->supp_rates_len; i++) {
1484 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1485 for (j = 0; j < sband->n_bitrates; j++)
1486 if (sband->bitrates[j].bitrate == bitrate)
1487 rates |= BIT(j);
1488 }
1489 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1490
1491 ieee80211_sta_def_wmm_params(sdata, bss);
1492
1493 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1494 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1495
1496 ieee80211_led_assoc(local, true);
1497
1498 memset(&wrqu, 0, sizeof(wrqu));
1499 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1500 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1501
1502 return res;
1503 }
1504
1505 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1506 struct ieee80211_mgmt *mgmt,
1507 size_t len,
1508 struct ieee80211_rx_status *rx_status,
1509 struct ieee802_11_elems *elems,
1510 bool beacon)
1511 {
1512 struct ieee80211_local *local = sdata->local;
1513 int freq;
1514 struct ieee80211_bss *bss;
1515 struct sta_info *sta;
1516 struct ieee80211_channel *channel;
1517 u64 beacon_timestamp, rx_timestamp;
1518 u64 supp_rates = 0;
1519 enum ieee80211_band band = rx_status->band;
1520
1521 if (elems->ds_params && elems->ds_params_len == 1)
1522 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1523 else
1524 freq = rx_status->freq;
1525
1526 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1527
1528 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1529 return;
1530
1531 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1532 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1533 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1534
1535 rcu_read_lock();
1536
1537 sta = sta_info_get(local, mgmt->sa);
1538 if (sta) {
1539 u64 prev_rates;
1540
1541 prev_rates = sta->sta.supp_rates[band];
1542 /* make sure mandatory rates are always added */
1543 sta->sta.supp_rates[band] = supp_rates |
1544 ieee80211_mandatory_rates(local, band);
1545
1546 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1547 if (sta->sta.supp_rates[band] != prev_rates)
1548 printk(KERN_DEBUG "%s: updated supp_rates set "
1549 "for %pM based on beacon info (0x%llx | "
1550 "0x%llx -> 0x%llx)\n",
1551 sdata->dev->name,
1552 sta->sta.addr,
1553 (unsigned long long) prev_rates,
1554 (unsigned long long) supp_rates,
1555 (unsigned long long) sta->sta.supp_rates[band]);
1556 #endif
1557 } else {
1558 ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
1559 mgmt->sa, supp_rates);
1560 }
1561
1562 rcu_read_unlock();
1563 }
1564
1565 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1566 freq, beacon);
1567 if (!bss)
1568 return;
1569
1570 /* was just updated in ieee80211_bss_info_update */
1571 beacon_timestamp = bss->timestamp;
1572
1573 /*
1574 * In STA mode, the remaining parameters should not be overridden
1575 * by beacons because they're not necessarily accurate there.
1576 */
1577 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1578 bss->last_probe_resp && beacon) {
1579 ieee80211_rx_bss_put(local, bss);
1580 return;
1581 }
1582
1583 /* check if we need to merge IBSS */
1584 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1585 bss->capability & WLAN_CAPABILITY_IBSS &&
1586 bss->freq == local->oper_channel->center_freq &&
1587 elems->ssid_len == sdata->u.sta.ssid_len &&
1588 memcmp(elems->ssid, sdata->u.sta.ssid,
1589 sdata->u.sta.ssid_len) == 0) {
1590 if (rx_status->flag & RX_FLAG_TSFT) {
1591 /* in order for correct IBSS merging we need mactime
1592 *
1593 * since mactime is defined as the time the first data
1594 * symbol of the frame hits the PHY, and the timestamp
1595 * of the beacon is defined as "the time that the data
1596 * symbol containing the first bit of the timestamp is
1597 * transmitted to the PHY plus the transmitting STA’s
1598 * delays through its local PHY from the MAC-PHY
1599 * interface to its interface with the WM"
1600 * (802.11 11.1.2) - equals the time this bit arrives at
1601 * the receiver - we have to take into account the
1602 * offset between the two.
1603 * e.g: at 1 MBit that means mactime is 192 usec earlier
1604 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1605 */
1606 int rate = local->hw.wiphy->bands[band]->
1607 bitrates[rx_status->rate_idx].bitrate;
1608 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1609 } else if (local && local->ops && local->ops->get_tsf)
1610 /* second best option: get current TSF */
1611 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1612 else
1613 /* can't merge without knowing the TSF */
1614 rx_timestamp = -1LLU;
1615 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1616 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1617 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1618 mgmt->sa, mgmt->bssid,
1619 (unsigned long long)rx_timestamp,
1620 (unsigned long long)beacon_timestamp,
1621 (unsigned long long)(rx_timestamp - beacon_timestamp),
1622 jiffies);
1623 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1624 if (beacon_timestamp > rx_timestamp) {
1625 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1626 printk(KERN_DEBUG "%s: beacon TSF higher than "
1627 "local TSF - IBSS merge with BSSID %pM\n",
1628 sdata->dev->name, mgmt->bssid);
1629 #endif
1630 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1631 ieee80211_ibss_add_sta(sdata, NULL,
1632 mgmt->bssid, mgmt->sa,
1633 supp_rates);
1634 }
1635 }
1636
1637 ieee80211_rx_bss_put(local, bss);
1638 }
1639
1640
1641 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1642 struct ieee80211_mgmt *mgmt,
1643 size_t len,
1644 struct ieee80211_rx_status *rx_status)
1645 {
1646 size_t baselen;
1647 struct ieee802_11_elems elems;
1648 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1649
1650 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1651 return; /* ignore ProbeResp to foreign address */
1652
1653 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1654 if (baselen > len)
1655 return;
1656
1657 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1658 &elems);
1659
1660 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1661
1662 /* direct probe may be part of the association flow */
1663 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1664 &ifsta->request)) {
1665 printk(KERN_DEBUG "%s direct probe responded\n",
1666 sdata->dev->name);
1667 ieee80211_authenticate(sdata, ifsta);
1668 }
1669 }
1670
1671
1672 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1673 struct ieee80211_mgmt *mgmt,
1674 size_t len,
1675 struct ieee80211_rx_status *rx_status)
1676 {
1677 struct ieee80211_if_sta *ifsta;
1678 size_t baselen;
1679 struct ieee802_11_elems elems;
1680 struct ieee80211_local *local = sdata->local;
1681 u32 changed = 0;
1682 bool erp_valid;
1683 u8 erp_value = 0;
1684
1685 /* Process beacon from the current BSS */
1686 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1687 if (baselen > len)
1688 return;
1689
1690 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1691
1692 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1693
1694 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1695 return;
1696 ifsta = &sdata->u.sta;
1697
1698 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1699 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1700 return;
1701
1702 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1703 elems.wmm_param_len);
1704
1705
1706 if (elems.erp_info && elems.erp_info_len >= 1) {
1707 erp_valid = true;
1708 erp_value = elems.erp_info[0];
1709 } else {
1710 erp_valid = false;
1711 }
1712 changed |= ieee80211_handle_bss_capability(sdata,
1713 le16_to_cpu(mgmt->u.beacon.capab_info),
1714 erp_valid, erp_value);
1715
1716
1717 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1718 struct sta_info *sta;
1719 struct ieee80211_supported_band *sband;
1720 u16 ap_ht_cap_flags;
1721
1722 rcu_read_lock();
1723
1724 sta = sta_info_get(local, ifsta->bssid);
1725 if (!sta) {
1726 rcu_read_unlock();
1727 return;
1728 }
1729
1730 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1731
1732 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1733 elems.ht_cap_elem, &sta->sta.ht_cap);
1734
1735 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1736
1737 rcu_read_unlock();
1738
1739 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1740 ap_ht_cap_flags);
1741 }
1742
1743 if (elems.country_elem) {
1744 /* Note we are only reviewing this on beacons
1745 * for the BSSID we are associated to */
1746 regulatory_hint_11d(local->hw.wiphy,
1747 elems.country_elem, elems.country_elem_len);
1748 }
1749
1750 ieee80211_bss_info_change_notify(sdata, changed);
1751 }
1752
1753
1754 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1755 struct ieee80211_if_sta *ifsta,
1756 struct ieee80211_mgmt *mgmt,
1757 size_t len,
1758 struct ieee80211_rx_status *rx_status)
1759 {
1760 struct ieee80211_local *local = sdata->local;
1761 int tx_last_beacon;
1762 struct sk_buff *skb;
1763 struct ieee80211_mgmt *resp;
1764 u8 *pos, *end;
1765
1766 if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1767 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1768 len < 24 + 2 || !ifsta->probe_resp)
1769 return;
1770
1771 if (local->ops->tx_last_beacon)
1772 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1773 else
1774 tx_last_beacon = 1;
1775
1776 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1777 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1778 " (tx_last_beacon=%d)\n",
1779 sdata->dev->name, mgmt->sa, mgmt->da,
1780 mgmt->bssid, tx_last_beacon);
1781 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1782
1783 if (!tx_last_beacon)
1784 return;
1785
1786 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1787 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1788 return;
1789
1790 end = ((u8 *) mgmt) + len;
1791 pos = mgmt->u.probe_req.variable;
1792 if (pos[0] != WLAN_EID_SSID ||
1793 pos + 2 + pos[1] > end) {
1794 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1795 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1796 "from %pM\n",
1797 sdata->dev->name, mgmt->sa);
1798 #endif
1799 return;
1800 }
1801 if (pos[1] != 0 &&
1802 (pos[1] != ifsta->ssid_len ||
1803 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1804 /* Ignore ProbeReq for foreign SSID */
1805 return;
1806 }
1807
1808 /* Reply with ProbeResp */
1809 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1810 if (!skb)
1811 return;
1812
1813 resp = (struct ieee80211_mgmt *) skb->data;
1814 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1815 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1816 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1817 sdata->dev->name, resp->da);
1818 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1819 ieee80211_tx_skb(sdata, skb, 0);
1820 }
1821
1822 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1823 struct ieee80211_rx_status *rx_status)
1824 {
1825 struct ieee80211_local *local = sdata->local;
1826 struct ieee80211_if_sta *ifsta;
1827 struct ieee80211_mgmt *mgmt;
1828 u16 fc;
1829
1830 if (skb->len < 24)
1831 goto fail;
1832
1833 ifsta = &sdata->u.sta;
1834
1835 mgmt = (struct ieee80211_mgmt *) skb->data;
1836 fc = le16_to_cpu(mgmt->frame_control);
1837
1838 switch (fc & IEEE80211_FCTL_STYPE) {
1839 case IEEE80211_STYPE_PROBE_REQ:
1840 case IEEE80211_STYPE_PROBE_RESP:
1841 case IEEE80211_STYPE_BEACON:
1842 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1843 case IEEE80211_STYPE_AUTH:
1844 case IEEE80211_STYPE_ASSOC_RESP:
1845 case IEEE80211_STYPE_REASSOC_RESP:
1846 case IEEE80211_STYPE_DEAUTH:
1847 case IEEE80211_STYPE_DISASSOC:
1848 skb_queue_tail(&ifsta->skb_queue, skb);
1849 queue_work(local->hw.workqueue, &ifsta->work);
1850 return;
1851 }
1852
1853 fail:
1854 kfree_skb(skb);
1855 }
1856
1857 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1858 struct sk_buff *skb)
1859 {
1860 struct ieee80211_rx_status *rx_status;
1861 struct ieee80211_if_sta *ifsta;
1862 struct ieee80211_mgmt *mgmt;
1863 u16 fc;
1864
1865 ifsta = &sdata->u.sta;
1866
1867 rx_status = (struct ieee80211_rx_status *) skb->cb;
1868 mgmt = (struct ieee80211_mgmt *) skb->data;
1869 fc = le16_to_cpu(mgmt->frame_control);
1870
1871 switch (fc & IEEE80211_FCTL_STYPE) {
1872 case IEEE80211_STYPE_PROBE_REQ:
1873 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1874 rx_status);
1875 break;
1876 case IEEE80211_STYPE_PROBE_RESP:
1877 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1878 break;
1879 case IEEE80211_STYPE_BEACON:
1880 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1881 break;
1882 case IEEE80211_STYPE_AUTH:
1883 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1884 break;
1885 case IEEE80211_STYPE_ASSOC_RESP:
1886 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1887 break;
1888 case IEEE80211_STYPE_REASSOC_RESP:
1889 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1890 break;
1891 case IEEE80211_STYPE_DEAUTH:
1892 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1893 break;
1894 case IEEE80211_STYPE_DISASSOC:
1895 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1896 break;
1897 }
1898
1899 kfree_skb(skb);
1900 }
1901
1902
1903 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1904 {
1905 struct ieee80211_local *local = sdata->local;
1906 int active = 0;
1907 struct sta_info *sta;
1908
1909 rcu_read_lock();
1910
1911 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1912 if (sta->sdata == sdata &&
1913 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1914 jiffies)) {
1915 active++;
1916 break;
1917 }
1918 }
1919
1920 rcu_read_unlock();
1921
1922 return active;
1923 }
1924
1925
1926 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
1927 struct ieee80211_if_sta *ifsta)
1928 {
1929 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1930
1931 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
1932 if (ieee80211_sta_active_ibss(sdata))
1933 return;
1934
1935 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1936 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
1937 ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
1938 }
1939
1940
1941 static void ieee80211_sta_timer(unsigned long data)
1942 {
1943 struct ieee80211_sub_if_data *sdata =
1944 (struct ieee80211_sub_if_data *) data;
1945 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1946 struct ieee80211_local *local = sdata->local;
1947
1948 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1949 queue_work(local->hw.workqueue, &ifsta->work);
1950 }
1951
1952 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
1953 struct ieee80211_if_sta *ifsta)
1954 {
1955 struct ieee80211_local *local = sdata->local;
1956
1957 if (local->ops->reset_tsf) {
1958 /* Reset own TSF to allow time synchronization work. */
1959 local->ops->reset_tsf(local_to_hw(local));
1960 }
1961
1962 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1963
1964
1965 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1966 ifsta->auth_alg = WLAN_AUTH_OPEN;
1967 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1968 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
1969 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1970 ifsta->auth_alg = WLAN_AUTH_LEAP;
1971 else
1972 ifsta->auth_alg = WLAN_AUTH_OPEN;
1973 ifsta->auth_transaction = -1;
1974 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
1975 ifsta->assoc_scan_tries = 0;
1976 ifsta->direct_probe_tries = 0;
1977 ifsta->auth_tries = 0;
1978 ifsta->assoc_tries = 0;
1979 netif_tx_stop_all_queues(sdata->dev);
1980 netif_carrier_off(sdata->dev);
1981 }
1982
1983
1984 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
1985 const char *ssid, int ssid_len)
1986 {
1987 int tmp, hidden_ssid;
1988
1989 if (ssid_len == ifsta->ssid_len &&
1990 !memcmp(ifsta->ssid, ssid, ssid_len))
1991 return 1;
1992
1993 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1994 return 0;
1995
1996 hidden_ssid = 1;
1997 tmp = ssid_len;
1998 while (tmp--) {
1999 if (ssid[tmp] != '\0') {
2000 hidden_ssid = 0;
2001 break;
2002 }
2003 }
2004
2005 if (hidden_ssid && ifsta->ssid_len == ssid_len)
2006 return 1;
2007
2008 if (ssid_len == 1 && ssid[0] == ' ')
2009 return 1;
2010
2011 return 0;
2012 }
2013
2014 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2015 struct ieee80211_if_sta *ifsta)
2016 {
2017 struct ieee80211_local *local = sdata->local;
2018 struct ieee80211_bss *bss;
2019 struct ieee80211_supported_band *sband;
2020 u8 bssid[ETH_ALEN], *pos;
2021 int i;
2022 int ret;
2023
2024 #if 0
2025 /* Easier testing, use fixed BSSID. */
2026 memset(bssid, 0xfe, ETH_ALEN);
2027 #else
2028 /* Generate random, not broadcast, locally administered BSSID. Mix in
2029 * own MAC address to make sure that devices that do not have proper
2030 * random number generator get different BSSID. */
2031 get_random_bytes(bssid, ETH_ALEN);
2032 for (i = 0; i < ETH_ALEN; i++)
2033 bssid[i] ^= sdata->dev->dev_addr[i];
2034 bssid[0] &= ~0x01;
2035 bssid[0] |= 0x02;
2036 #endif
2037
2038 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2039 sdata->dev->name, bssid);
2040
2041 bss = ieee80211_rx_bss_add(local, bssid,
2042 local->hw.conf.channel->center_freq,
2043 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2044 if (!bss)
2045 return -ENOMEM;
2046
2047 bss->band = local->hw.conf.channel->band;
2048 sband = local->hw.wiphy->bands[bss->band];
2049
2050 if (local->hw.conf.beacon_int == 0)
2051 local->hw.conf.beacon_int = 100;
2052 bss->beacon_int = local->hw.conf.beacon_int;
2053 bss->last_update = jiffies;
2054 bss->capability = WLAN_CAPABILITY_IBSS;
2055
2056 if (sdata->default_key)
2057 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2058 else
2059 sdata->drop_unencrypted = 0;
2060
2061 bss->supp_rates_len = sband->n_bitrates;
2062 pos = bss->supp_rates;
2063 for (i = 0; i < sband->n_bitrates; i++) {
2064 int rate = sband->bitrates[i].bitrate;
2065 *pos++ = (u8) (rate / 5);
2066 }
2067
2068 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2069 ieee80211_rx_bss_put(local, bss);
2070 return ret;
2071 }
2072
2073
2074 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2075 struct ieee80211_if_sta *ifsta)
2076 {
2077 struct ieee80211_local *local = sdata->local;
2078 struct ieee80211_bss *bss;
2079 int found = 0;
2080 u8 bssid[ETH_ALEN];
2081 int active_ibss;
2082
2083 if (ifsta->ssid_len == 0)
2084 return -EINVAL;
2085
2086 active_ibss = ieee80211_sta_active_ibss(sdata);
2087 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2088 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2089 sdata->dev->name, active_ibss);
2090 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2091 spin_lock_bh(&local->bss_lock);
2092 list_for_each_entry(bss, &local->bss_list, list) {
2093 if (ifsta->ssid_len != bss->ssid_len ||
2094 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2095 || !(bss->capability & WLAN_CAPABILITY_IBSS))
2096 continue;
2097 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2098 printk(KERN_DEBUG " bssid=%pM found\n", bss->bssid);
2099 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2100 memcpy(bssid, bss->bssid, ETH_ALEN);
2101 found = 1;
2102 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2103 break;
2104 }
2105 spin_unlock_bh(&local->bss_lock);
2106
2107 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2108 if (found)
2109 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
2110 "%pM\n", bssid, ifsta->bssid);
2111 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2112
2113 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2114 int ret;
2115 int search_freq;
2116
2117 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2118 search_freq = bss->freq;
2119 else
2120 search_freq = local->hw.conf.channel->center_freq;
2121
2122 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2123 ifsta->ssid, ifsta->ssid_len);
2124 if (!bss)
2125 goto dont_join;
2126
2127 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2128 " based on configured SSID\n",
2129 sdata->dev->name, bssid);
2130 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2131 ieee80211_rx_bss_put(local, bss);
2132 return ret;
2133 }
2134
2135 dont_join:
2136 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2137 printk(KERN_DEBUG " did not try to join ibss\n");
2138 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2139
2140 /* Selected IBSS not found in current scan results - try to scan */
2141 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2142 !ieee80211_sta_active_ibss(sdata)) {
2143 mod_timer(&ifsta->timer, jiffies +
2144 IEEE80211_IBSS_MERGE_INTERVAL);
2145 } else if (time_after(jiffies, local->last_scan_completed +
2146 IEEE80211_SCAN_INTERVAL)) {
2147 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2148 "join\n", sdata->dev->name);
2149 return ieee80211_request_scan(sdata, ifsta->ssid,
2150 ifsta->ssid_len);
2151 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2152 int interval = IEEE80211_SCAN_INTERVAL;
2153
2154 if (time_after(jiffies, ifsta->ibss_join_req +
2155 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2156 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2157 (!(local->oper_channel->flags &
2158 IEEE80211_CHAN_NO_IBSS)))
2159 return ieee80211_sta_create_ibss(sdata, ifsta);
2160 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2161 printk(KERN_DEBUG "%s: IBSS not allowed on"
2162 " %d MHz\n", sdata->dev->name,
2163 local->hw.conf.channel->center_freq);
2164 }
2165
2166 /* No IBSS found - decrease scan interval and continue
2167 * scanning. */
2168 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2169 }
2170
2171 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2172 mod_timer(&ifsta->timer, jiffies + interval);
2173 return 0;
2174 }
2175
2176 return 0;
2177 }
2178
2179
2180 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2181 struct ieee80211_if_sta *ifsta)
2182 {
2183 struct ieee80211_local *local = sdata->local;
2184 struct ieee80211_bss *bss, *selected = NULL;
2185 int top_rssi = 0, freq;
2186
2187 spin_lock_bh(&local->bss_lock);
2188 freq = local->oper_channel->center_freq;
2189 list_for_each_entry(bss, &local->bss_list, list) {
2190 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2191 continue;
2192
2193 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2194 IEEE80211_STA_AUTO_BSSID_SEL |
2195 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2196 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2197 !!sdata->default_key))
2198 continue;
2199
2200 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2201 bss->freq != freq)
2202 continue;
2203
2204 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2205 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2206 continue;
2207
2208 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2209 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2210 continue;
2211
2212 if (!selected || top_rssi < bss->signal) {
2213 selected = bss;
2214 top_rssi = bss->signal;
2215 }
2216 }
2217 if (selected)
2218 atomic_inc(&selected->users);
2219 spin_unlock_bh(&local->bss_lock);
2220
2221 if (selected) {
2222 ieee80211_set_freq(sdata, selected->freq);
2223 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2224 ieee80211_sta_set_ssid(sdata, selected->ssid,
2225 selected->ssid_len);
2226 ieee80211_sta_set_bssid(sdata, selected->bssid);
2227 ieee80211_sta_def_wmm_params(sdata, selected);
2228
2229 /* Send out direct probe if no probe resp was received or
2230 * the one we have is outdated
2231 */
2232 if (!selected->last_probe_resp ||
2233 time_after(jiffies, selected->last_probe_resp
2234 + IEEE80211_SCAN_RESULT_EXPIRE))
2235 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2236 else
2237 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2238
2239 ieee80211_rx_bss_put(local, selected);
2240 ieee80211_sta_reset_auth(sdata, ifsta);
2241 return 0;
2242 } else {
2243 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2244 ifsta->assoc_scan_tries++;
2245 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2246 ieee80211_start_scan(sdata, NULL, 0);
2247 else
2248 ieee80211_start_scan(sdata, ifsta->ssid,
2249 ifsta->ssid_len);
2250 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2251 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2252 } else
2253 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2254 }
2255 return -1;
2256 }
2257
2258
2259 static void ieee80211_sta_work(struct work_struct *work)
2260 {
2261 struct ieee80211_sub_if_data *sdata =
2262 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2263 struct ieee80211_local *local = sdata->local;
2264 struct ieee80211_if_sta *ifsta;
2265 struct sk_buff *skb;
2266
2267 if (!netif_running(sdata->dev))
2268 return;
2269
2270 if (local->sw_scanning || local->hw_scanning)
2271 return;
2272
2273 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2274 sdata->vif.type != NL80211_IFTYPE_ADHOC))
2275 return;
2276 ifsta = &sdata->u.sta;
2277
2278 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2279 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2280
2281 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2282 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2283 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2284 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2285 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2286 ifsta->scan_ssid_len);
2287 return;
2288 }
2289
2290 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2291 if (ieee80211_sta_config_auth(sdata, ifsta))
2292 return;
2293 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2294 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2295 return;
2296
2297 switch (ifsta->state) {
2298 case IEEE80211_STA_MLME_DISABLED:
2299 break;
2300 case IEEE80211_STA_MLME_DIRECT_PROBE:
2301 ieee80211_direct_probe(sdata, ifsta);
2302 break;
2303 case IEEE80211_STA_MLME_AUTHENTICATE:
2304 ieee80211_authenticate(sdata, ifsta);
2305 break;
2306 case IEEE80211_STA_MLME_ASSOCIATE:
2307 ieee80211_associate(sdata, ifsta);
2308 break;
2309 case IEEE80211_STA_MLME_ASSOCIATED:
2310 ieee80211_associated(sdata, ifsta);
2311 break;
2312 case IEEE80211_STA_MLME_IBSS_SEARCH:
2313 ieee80211_sta_find_ibss(sdata, ifsta);
2314 break;
2315 case IEEE80211_STA_MLME_IBSS_JOINED:
2316 ieee80211_sta_merge_ibss(sdata, ifsta);
2317 break;
2318 default:
2319 WARN_ON(1);
2320 break;
2321 }
2322
2323 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2324 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2325 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2326
2327 ieee80211_set_disassoc(sdata, ifsta, false, true,
2328 WLAN_REASON_UNSPECIFIED);
2329 }
2330 }
2331
2332 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2333 {
2334 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2335 queue_work(sdata->local->hw.workqueue,
2336 &sdata->u.sta.work);
2337 }
2338
2339 /* interface setup */
2340 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2341 {
2342 struct ieee80211_if_sta *ifsta;
2343
2344 ifsta = &sdata->u.sta;
2345 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2346 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2347 (unsigned long) sdata);
2348 skb_queue_head_init(&ifsta->skb_queue);
2349
2350 ifsta->capab = WLAN_CAPABILITY_ESS;
2351 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2352 IEEE80211_AUTH_ALG_SHARED_KEY;
2353 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2354 IEEE80211_STA_AUTO_BSSID_SEL |
2355 IEEE80211_STA_AUTO_CHANNEL_SEL;
2356 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2357 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2358 }
2359
2360 /*
2361 * Add a new IBSS station, will also be called by the RX code when,
2362 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2363 * must be callable in atomic context.
2364 */
2365 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2366 struct sk_buff *skb, u8 *bssid,
2367 u8 *addr, u64 supp_rates)
2368 {
2369 struct ieee80211_local *local = sdata->local;
2370 struct sta_info *sta;
2371 int band = local->hw.conf.channel->band;
2372
2373 /* TODO: Could consider removing the least recently used entry and
2374 * allow new one to be added. */
2375 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2376 if (net_ratelimit()) {
2377 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2378 "entry %pM\n", sdata->dev->name, addr);
2379 }
2380 return NULL;
2381 }
2382
2383 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2384 return NULL;
2385
2386 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2387 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2388 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2389 #endif
2390
2391 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2392 if (!sta)
2393 return NULL;
2394
2395 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2396
2397 /* make sure mandatory rates are always added */
2398 sta->sta.supp_rates[band] = supp_rates |
2399 ieee80211_mandatory_rates(local, band);
2400
2401 rate_control_rate_init(sta);
2402
2403 if (sta_info_insert(sta))
2404 return NULL;
2405
2406 return sta;
2407 }
2408
2409 /* configuration hooks */
2410 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2411 struct ieee80211_if_sta *ifsta)
2412 {
2413 struct ieee80211_local *local = sdata->local;
2414
2415 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2416 return;
2417
2418 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2419 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2420 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2421 IEEE80211_STA_AUTO_SSID_SEL))) {
2422
2423 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2424 ieee80211_set_disassoc(sdata, ifsta, true, true,
2425 WLAN_REASON_DEAUTH_LEAVING);
2426
2427 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2428 queue_work(local->hw.workqueue, &ifsta->work);
2429 }
2430 }
2431
2432 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2433 {
2434 struct ieee80211_if_sta *ifsta;
2435
2436 if (len > IEEE80211_MAX_SSID_LEN)
2437 return -EINVAL;
2438
2439 ifsta = &sdata->u.sta;
2440
2441 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2442 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2443 memcpy(ifsta->ssid, ssid, len);
2444 ifsta->ssid_len = len;
2445 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2446 }
2447
2448 if (len)
2449 ifsta->flags |= IEEE80211_STA_SSID_SET;
2450 else
2451 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2452
2453 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2454 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2455 ifsta->ibss_join_req = jiffies;
2456 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2457 return ieee80211_sta_find_ibss(sdata, ifsta);
2458 }
2459
2460 return 0;
2461 }
2462
2463 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2464 {
2465 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2466 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2467 *len = ifsta->ssid_len;
2468 return 0;
2469 }
2470
2471 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2472 {
2473 struct ieee80211_if_sta *ifsta;
2474 int res;
2475
2476 ifsta = &sdata->u.sta;
2477
2478 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2479 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2480 res = 0;
2481 /*
2482 * Hack! See also ieee80211_sta_set_ssid.
2483 */
2484 if (netif_running(sdata->dev))
2485 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2486 if (res) {
2487 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2488 "the low-level driver\n", sdata->dev->name);
2489 return res;
2490 }
2491 }
2492
2493 if (is_valid_ether_addr(bssid))
2494 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2495 else
2496 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2497
2498 return 0;
2499 }
2500
2501 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2502 {
2503 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2504
2505 kfree(ifsta->extra_ie);
2506 if (len == 0) {
2507 ifsta->extra_ie = NULL;
2508 ifsta->extra_ie_len = 0;
2509 return 0;
2510 }
2511 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2512 if (!ifsta->extra_ie) {
2513 ifsta->extra_ie_len = 0;
2514 return -ENOMEM;
2515 }
2516 memcpy(ifsta->extra_ie, ie, len);
2517 ifsta->extra_ie_len = len;
2518 return 0;
2519 }
2520
2521 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2522 {
2523 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2524
2525 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2526 sdata->dev->name, reason);
2527
2528 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2529 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2530 return -EINVAL;
2531
2532 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2533 return 0;
2534 }
2535
2536 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2537 {
2538 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2539
2540 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2541 sdata->dev->name, reason);
2542
2543 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2544 return -EINVAL;
2545
2546 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2547 return -1;
2548
2549 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2550 return 0;
2551 }
2552
2553 /* scan finished notification */
2554 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2555 {
2556 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2557 struct ieee80211_if_sta *ifsta;
2558
2559 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2560 ifsta = &sdata->u.sta;
2561 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2562 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2563 !ieee80211_sta_active_ibss(sdata)))
2564 ieee80211_sta_find_ibss(sdata, ifsta);
2565 }
2566
2567 /* Restart STA timers */
2568 rcu_read_lock();
2569 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2570 ieee80211_restart_sta_timer(sdata);
2571 rcu_read_unlock();
2572 }
Support for the Chinese Samsung S3C2440 based development boards