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mac80211: move bss_conf into vif
[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_ie;
240 int i, len, count, rates_len, supp_rates_len;
241 u16 capab;
242 struct ieee80211_bss *bss;
243 int wmm = 0;
244 struct ieee80211_supported_band *sband;
245 u64 rates = 0;
246
247 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
248 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
249 ifsta->ssid_len);
250 if (!skb) {
251 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
252 "frame\n", sdata->dev->name);
253 return;
254 }
255 skb_reserve(skb, local->hw.extra_tx_headroom);
256
257 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
258
259 capab = ifsta->capab;
260
261 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
262 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
263 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
264 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
265 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
266 }
267
268 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
269 local->hw.conf.channel->center_freq,
270 ifsta->ssid, ifsta->ssid_len);
271 if (bss) {
272 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
273 capab |= WLAN_CAPABILITY_PRIVACY;
274 if (bss->wmm_used)
275 wmm = 1;
276
277 /* get all rates supported by the device and the AP as
278 * some APs don't like getting a superset of their rates
279 * in the association request (e.g. D-Link DAP 1353 in
280 * b-only mode) */
281 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
282
283 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
284 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
285 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
286
287 ieee80211_rx_bss_put(local, bss);
288 } else {
289 rates = ~0;
290 rates_len = sband->n_bitrates;
291 }
292
293 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
294 memset(mgmt, 0, 24);
295 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
296 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
297 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
298
299 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
300 skb_put(skb, 10);
301 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
302 IEEE80211_STYPE_REASSOC_REQ);
303 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
304 mgmt->u.reassoc_req.listen_interval =
305 cpu_to_le16(local->hw.conf.listen_interval);
306 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
307 ETH_ALEN);
308 } else {
309 skb_put(skb, 4);
310 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
311 IEEE80211_STYPE_ASSOC_REQ);
312 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
313 mgmt->u.reassoc_req.listen_interval =
314 cpu_to_le16(local->hw.conf.listen_interval);
315 }
316
317 /* SSID */
318 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
319 *pos++ = WLAN_EID_SSID;
320 *pos++ = ifsta->ssid_len;
321 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
322
323 /* add all rates which were marked to be used above */
324 supp_rates_len = rates_len;
325 if (supp_rates_len > 8)
326 supp_rates_len = 8;
327
328 len = sband->n_bitrates;
329 pos = skb_put(skb, supp_rates_len + 2);
330 *pos++ = WLAN_EID_SUPP_RATES;
331 *pos++ = supp_rates_len;
332
333 count = 0;
334 for (i = 0; i < sband->n_bitrates; i++) {
335 if (BIT(i) & rates) {
336 int rate = sband->bitrates[i].bitrate;
337 *pos++ = (u8) (rate / 5);
338 if (++count == 8)
339 break;
340 }
341 }
342
343 if (rates_len > count) {
344 pos = skb_put(skb, rates_len - count + 2);
345 *pos++ = WLAN_EID_EXT_SUPP_RATES;
346 *pos++ = rates_len - count;
347
348 for (i++; i < sband->n_bitrates; i++) {
349 if (BIT(i) & rates) {
350 int rate = sband->bitrates[i].bitrate;
351 *pos++ = (u8) (rate / 5);
352 }
353 }
354 }
355
356 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
357 /* 1. power capabilities */
358 pos = skb_put(skb, 4);
359 *pos++ = WLAN_EID_PWR_CAPABILITY;
360 *pos++ = 2;
361 *pos++ = 0; /* min tx power */
362 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
363
364 /* 2. supported channels */
365 /* TODO: get this in reg domain format */
366 pos = skb_put(skb, 2 * sband->n_channels + 2);
367 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
368 *pos++ = 2 * sband->n_channels;
369 for (i = 0; i < sband->n_channels; i++) {
370 *pos++ = ieee80211_frequency_to_channel(
371 sband->channels[i].center_freq);
372 *pos++ = 1; /* one channel in the subband*/
373 }
374 }
375
376 if (ifsta->extra_ie) {
377 pos = skb_put(skb, ifsta->extra_ie_len);
378 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
379 }
380
381 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
382 pos = skb_put(skb, 9);
383 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
384 *pos++ = 7; /* len */
385 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
386 *pos++ = 0x50;
387 *pos++ = 0xf2;
388 *pos++ = 2; /* WME */
389 *pos++ = 0; /* WME info */
390 *pos++ = 1; /* WME ver */
391 *pos++ = 0;
392 }
393
394 /* wmm support is a must to HT */
395 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
396 sband->ht_cap.ht_supported &&
397 (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
398 ht_ie[1] >= sizeof(struct ieee80211_ht_info)) {
399 struct ieee80211_ht_info *ht_info =
400 (struct ieee80211_ht_info *)(ht_ie + 2);
401 u16 cap = sband->ht_cap.cap;
402 __le16 tmp;
403 u32 flags = local->hw.conf.channel->flags;
404
405 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
406 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
407 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
408 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
409 cap &= ~IEEE80211_HT_CAP_SGI_40;
410 }
411 break;
412 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
413 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
414 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
415 cap &= ~IEEE80211_HT_CAP_SGI_40;
416 }
417 break;
418 }
419
420 tmp = cpu_to_le16(cap);
421 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
422 *pos++ = WLAN_EID_HT_CAPABILITY;
423 *pos++ = sizeof(struct ieee80211_ht_cap);
424 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
425 memcpy(pos, &tmp, sizeof(u16));
426 pos += sizeof(u16);
427 /* TODO: needs a define here for << 2 */
428 *pos++ = sband->ht_cap.ampdu_factor |
429 (sband->ht_cap.ampdu_density << 2);
430 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
431 }
432
433 kfree(ifsta->assocreq_ies);
434 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
435 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
436 if (ifsta->assocreq_ies)
437 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
438
439 ieee80211_tx_skb(sdata, skb, 0);
440 }
441
442
443 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
444 u16 stype, u16 reason)
445 {
446 struct ieee80211_local *local = sdata->local;
447 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
448 struct sk_buff *skb;
449 struct ieee80211_mgmt *mgmt;
450
451 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
452 if (!skb) {
453 printk(KERN_DEBUG "%s: failed to allocate buffer for "
454 "deauth/disassoc frame\n", sdata->dev->name);
455 return;
456 }
457 skb_reserve(skb, local->hw.extra_tx_headroom);
458
459 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
460 memset(mgmt, 0, 24);
461 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
462 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
463 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
464 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
465 skb_put(skb, 2);
466 /* u.deauth.reason_code == u.disassoc.reason_code */
467 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
468
469 ieee80211_tx_skb(sdata, skb, 0);
470 }
471
472 /* MLME */
473 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
474 struct ieee80211_bss *bss)
475 {
476 struct ieee80211_local *local = sdata->local;
477 int i, have_higher_than_11mbit = 0;
478
479 /* cf. IEEE 802.11 9.2.12 */
480 for (i = 0; i < bss->supp_rates_len; i++)
481 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
482 have_higher_than_11mbit = 1;
483
484 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
485 have_higher_than_11mbit)
486 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
487 else
488 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
489
490 ieee80211_set_wmm_default(sdata);
491 }
492
493 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
494 struct ieee80211_if_sta *ifsta,
495 u8 *wmm_param, size_t wmm_param_len)
496 {
497 struct ieee80211_tx_queue_params params;
498 size_t left;
499 int count;
500 u8 *pos;
501
502 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
503 return;
504
505 if (!wmm_param)
506 return;
507
508 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
509 return;
510 count = wmm_param[6] & 0x0f;
511 if (count == ifsta->wmm_last_param_set)
512 return;
513 ifsta->wmm_last_param_set = count;
514
515 pos = wmm_param + 8;
516 left = wmm_param_len - 8;
517
518 memset(&params, 0, sizeof(params));
519
520 if (!local->ops->conf_tx)
521 return;
522
523 local->wmm_acm = 0;
524 for (; left >= 4; left -= 4, pos += 4) {
525 int aci = (pos[0] >> 5) & 0x03;
526 int acm = (pos[0] >> 4) & 0x01;
527 int queue;
528
529 switch (aci) {
530 case 1:
531 queue = 3;
532 if (acm)
533 local->wmm_acm |= BIT(0) | BIT(3);
534 break;
535 case 2:
536 queue = 1;
537 if (acm)
538 local->wmm_acm |= BIT(4) | BIT(5);
539 break;
540 case 3:
541 queue = 0;
542 if (acm)
543 local->wmm_acm |= BIT(6) | BIT(7);
544 break;
545 case 0:
546 default:
547 queue = 2;
548 if (acm)
549 local->wmm_acm |= BIT(1) | BIT(2);
550 break;
551 }
552
553 params.aifs = pos[0] & 0x0f;
554 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
555 params.cw_min = ecw2cw(pos[1] & 0x0f);
556 params.txop = get_unaligned_le16(pos + 2);
557 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
558 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
559 "cWmin=%d cWmax=%d txop=%d\n",
560 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
561 params.cw_max, params.txop);
562 #endif
563 /* TODO: handle ACM (block TX, fallback to next lowest allowed
564 * AC for now) */
565 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
566 printk(KERN_DEBUG "%s: failed to set TX queue "
567 "parameters for queue %d\n", local->mdev->name, queue);
568 }
569 }
570 }
571
572 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
573 u16 capab, bool erp_valid, u8 erp)
574 {
575 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
576 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
577 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
578 #endif
579 u32 changed = 0;
580 bool use_protection;
581 bool use_short_preamble;
582 bool use_short_slot;
583
584 if (erp_valid) {
585 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
586 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
587 } else {
588 use_protection = false;
589 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
590 }
591
592 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
593
594 if (use_protection != bss_conf->use_cts_prot) {
595 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
596 if (net_ratelimit()) {
597 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
598 sdata->dev->name,
599 use_protection ? "enabled" : "disabled",
600 ifsta->bssid);
601 }
602 #endif
603 bss_conf->use_cts_prot = use_protection;
604 changed |= BSS_CHANGED_ERP_CTS_PROT;
605 }
606
607 if (use_short_preamble != bss_conf->use_short_preamble) {
608 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
609 if (net_ratelimit()) {
610 printk(KERN_DEBUG "%s: switched to %s barker preamble"
611 " (BSSID=%pM)\n",
612 sdata->dev->name,
613 use_short_preamble ? "short" : "long",
614 ifsta->bssid);
615 }
616 #endif
617 bss_conf->use_short_preamble = use_short_preamble;
618 changed |= BSS_CHANGED_ERP_PREAMBLE;
619 }
620
621 if (use_short_slot != bss_conf->use_short_slot) {
622 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
623 if (net_ratelimit()) {
624 printk(KERN_DEBUG "%s: switched to %s slot"
625 " (BSSID=%s)\n",
626 sdata->dev->name,
627 use_short_slot ? "short" : "long",
628 ifsta->bssid);
629 }
630 #endif
631 bss_conf->use_short_slot = use_short_slot;
632 changed |= BSS_CHANGED_ERP_SLOT;
633 }
634
635 return changed;
636 }
637
638 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
639 struct ieee80211_if_sta *ifsta)
640 {
641 union iwreq_data wrqu;
642 memset(&wrqu, 0, sizeof(wrqu));
643 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
644 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
645 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
646 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
647 }
648
649 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
650 struct ieee80211_if_sta *ifsta)
651 {
652 char *buf;
653 size_t len;
654 int i;
655 union iwreq_data wrqu;
656
657 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
658 return;
659
660 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
661 ifsta->assocresp_ies_len), GFP_KERNEL);
662 if (!buf)
663 return;
664
665 len = sprintf(buf, "ASSOCINFO(");
666 if (ifsta->assocreq_ies) {
667 len += sprintf(buf + len, "ReqIEs=");
668 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
669 len += sprintf(buf + len, "%02x",
670 ifsta->assocreq_ies[i]);
671 }
672 }
673 if (ifsta->assocresp_ies) {
674 if (ifsta->assocreq_ies)
675 len += sprintf(buf + len, " ");
676 len += sprintf(buf + len, "RespIEs=");
677 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
678 len += sprintf(buf + len, "%02x",
679 ifsta->assocresp_ies[i]);
680 }
681 }
682 len += sprintf(buf + len, ")");
683
684 if (len > IW_CUSTOM_MAX) {
685 len = sprintf(buf, "ASSOCRESPIE=");
686 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
687 len += sprintf(buf + len, "%02x",
688 ifsta->assocresp_ies[i]);
689 }
690 }
691
692 if (len <= IW_CUSTOM_MAX) {
693 memset(&wrqu, 0, sizeof(wrqu));
694 wrqu.data.length = len;
695 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
696 }
697
698 kfree(buf);
699 }
700
701
702 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
703 struct ieee80211_if_sta *ifsta)
704 {
705 struct ieee80211_local *local = sdata->local;
706 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
707 u32 changed = BSS_CHANGED_ASSOC;
708
709 struct ieee80211_bss *bss;
710
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 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 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
732 changed |= BSS_CHANGED_HT;
733 sdata->vif.bss_conf.assoc_ht = 1;
734 sdata->vif.bss_conf.ht_cap = &conf->ht_cap;
735 sdata->vif.bss_conf.ht_bss_conf = &conf->ht_bss_conf;
736 }
737
738 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
739 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
740 ieee80211_sta_send_associnfo(sdata, ifsta);
741
742 ifsta->last_probe = jiffies;
743 ieee80211_led_assoc(local, 1);
744
745 sdata->vif.bss_conf.assoc = 1;
746 /*
747 * For now just always ask the driver to update the basic rateset
748 * when we have associated, we aren't checking whether it actually
749 * changed or not.
750 */
751 changed |= BSS_CHANGED_BASIC_RATES;
752 ieee80211_bss_info_change_notify(sdata, changed);
753
754 netif_tx_start_all_queues(sdata->dev);
755 netif_carrier_on(sdata->dev);
756
757 ieee80211_sta_send_apinfo(sdata, ifsta);
758 }
759
760 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
761 struct ieee80211_if_sta *ifsta)
762 {
763 ifsta->direct_probe_tries++;
764 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
765 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
766 sdata->dev->name, ifsta->bssid);
767 ifsta->state = IEEE80211_STA_MLME_DISABLED;
768 return;
769 }
770
771 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
772 sdata->dev->name, ifsta->bssid,
773 ifsta->direct_probe_tries);
774
775 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
776
777 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
778
779 /* Direct probe is sent to broadcast address as some APs
780 * will not answer to direct packet in unassociated state.
781 */
782 ieee80211_send_probe_req(sdata, NULL,
783 ifsta->ssid, ifsta->ssid_len);
784
785 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
786 }
787
788
789 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
790 struct ieee80211_if_sta *ifsta)
791 {
792 ifsta->auth_tries++;
793 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
794 printk(KERN_DEBUG "%s: authentication with AP %pM"
795 " timed out\n",
796 sdata->dev->name, ifsta->bssid);
797 ifsta->state = IEEE80211_STA_MLME_DISABLED;
798 return;
799 }
800
801 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
802 printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
803 sdata->dev->name, ifsta->bssid);
804
805 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
806
807 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
808 }
809
810 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
811 struct ieee80211_if_sta *ifsta, bool deauth,
812 bool self_disconnected, u16 reason)
813 {
814 struct ieee80211_local *local = sdata->local;
815 struct sta_info *sta;
816 u32 changed = BSS_CHANGED_ASSOC;
817
818 rcu_read_lock();
819
820 sta = sta_info_get(local, ifsta->bssid);
821 if (!sta) {
822 rcu_read_unlock();
823 return;
824 }
825
826 if (deauth) {
827 ifsta->direct_probe_tries = 0;
828 ifsta->auth_tries = 0;
829 }
830 ifsta->assoc_scan_tries = 0;
831 ifsta->assoc_tries = 0;
832
833 netif_tx_stop_all_queues(sdata->dev);
834 netif_carrier_off(sdata->dev);
835
836 ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
837
838 if (self_disconnected) {
839 if (deauth)
840 ieee80211_send_deauth_disassoc(sdata,
841 IEEE80211_STYPE_DEAUTH, reason);
842 else
843 ieee80211_send_deauth_disassoc(sdata,
844 IEEE80211_STYPE_DISASSOC, reason);
845 }
846
847 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
848 changed |= ieee80211_reset_erp_info(sdata);
849
850 if (sdata->vif.bss_conf.assoc_ht)
851 changed |= BSS_CHANGED_HT;
852
853 sdata->vif.bss_conf.assoc_ht = 0;
854 sdata->vif.bss_conf.ht_cap = NULL;
855 sdata->vif.bss_conf.ht_bss_conf = NULL;
856
857 ieee80211_led_assoc(local, 0);
858 sdata->vif.bss_conf.assoc = 0;
859
860 ieee80211_sta_send_apinfo(sdata, ifsta);
861
862 if (self_disconnected)
863 ifsta->state = IEEE80211_STA_MLME_DISABLED;
864
865 sta_info_unlink(&sta);
866
867 rcu_read_unlock();
868
869 sta_info_destroy(sta);
870 }
871
872 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
873 {
874 if (!sdata || !sdata->default_key ||
875 sdata->default_key->conf.alg != ALG_WEP)
876 return 0;
877 return 1;
878 }
879
880 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
881 struct ieee80211_if_sta *ifsta)
882 {
883 struct ieee80211_local *local = sdata->local;
884 struct ieee80211_bss *bss;
885 int bss_privacy;
886 int wep_privacy;
887 int privacy_invoked;
888
889 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
890 return 0;
891
892 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
893 local->hw.conf.channel->center_freq,
894 ifsta->ssid, ifsta->ssid_len);
895 if (!bss)
896 return 0;
897
898 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
899 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
900 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
901
902 ieee80211_rx_bss_put(local, bss);
903
904 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
905 return 0;
906
907 return 1;
908 }
909
910 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
911 struct ieee80211_if_sta *ifsta)
912 {
913 ifsta->assoc_tries++;
914 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
915 printk(KERN_DEBUG "%s: association with AP %pM"
916 " timed out\n",
917 sdata->dev->name, ifsta->bssid);
918 ifsta->state = IEEE80211_STA_MLME_DISABLED;
919 return;
920 }
921
922 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
923 printk(KERN_DEBUG "%s: associate with AP %pM\n",
924 sdata->dev->name, ifsta->bssid);
925 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
926 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
927 "mixed-cell disabled - abort association\n", sdata->dev->name);
928 ifsta->state = IEEE80211_STA_MLME_DISABLED;
929 return;
930 }
931
932 ieee80211_send_assoc(sdata, ifsta);
933
934 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
935 }
936
937
938 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
939 struct ieee80211_if_sta *ifsta)
940 {
941 struct ieee80211_local *local = sdata->local;
942 struct sta_info *sta;
943 int disassoc;
944
945 /* TODO: start monitoring current AP signal quality and number of
946 * missed beacons. Scan other channels every now and then and search
947 * for better APs. */
948 /* TODO: remove expired BSSes */
949
950 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
951
952 rcu_read_lock();
953
954 sta = sta_info_get(local, ifsta->bssid);
955 if (!sta) {
956 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
957 sdata->dev->name, ifsta->bssid);
958 disassoc = 1;
959 } else {
960 disassoc = 0;
961 if (time_after(jiffies,
962 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
963 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
964 printk(KERN_DEBUG "%s: No ProbeResp from "
965 "current AP %pM - assume out of "
966 "range\n",
967 sdata->dev->name, ifsta->bssid);
968 disassoc = 1;
969 } else
970 ieee80211_send_probe_req(sdata, ifsta->bssid,
971 ifsta->ssid,
972 ifsta->ssid_len);
973 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
974 } else {
975 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
976 if (time_after(jiffies, ifsta->last_probe +
977 IEEE80211_PROBE_INTERVAL)) {
978 ifsta->last_probe = jiffies;
979 ieee80211_send_probe_req(sdata, ifsta->bssid,
980 ifsta->ssid,
981 ifsta->ssid_len);
982 }
983 }
984 }
985
986 rcu_read_unlock();
987
988 if (disassoc)
989 ieee80211_set_disassoc(sdata, ifsta, true, true,
990 WLAN_REASON_PREV_AUTH_NOT_VALID);
991 else
992 mod_timer(&ifsta->timer, jiffies +
993 IEEE80211_MONITORING_INTERVAL);
994 }
995
996
997 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
998 struct ieee80211_if_sta *ifsta)
999 {
1000 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1001 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1002 ieee80211_associate(sdata, ifsta);
1003 }
1004
1005
1006 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1007 struct ieee80211_if_sta *ifsta,
1008 struct ieee80211_mgmt *mgmt,
1009 size_t len)
1010 {
1011 u8 *pos;
1012 struct ieee802_11_elems elems;
1013
1014 pos = mgmt->u.auth.variable;
1015 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1016 if (!elems.challenge)
1017 return;
1018 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1019 elems.challenge_len + 2, 1);
1020 }
1021
1022 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1023 struct ieee80211_if_sta *ifsta,
1024 struct ieee80211_mgmt *mgmt,
1025 size_t len)
1026 {
1027 u16 auth_alg, auth_transaction, status_code;
1028
1029 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1030 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1031 return;
1032
1033 if (len < 24 + 6)
1034 return;
1035
1036 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1037 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1038 return;
1039
1040 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1041 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1042 return;
1043
1044 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1045 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1046 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1047
1048 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1049 /*
1050 * IEEE 802.11 standard does not require authentication in IBSS
1051 * networks and most implementations do not seem to use it.
1052 * However, try to reply to authentication attempts if someone
1053 * has actually implemented this.
1054 */
1055 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1056 return;
1057 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1058 }
1059
1060 if (auth_alg != ifsta->auth_alg ||
1061 auth_transaction != ifsta->auth_transaction)
1062 return;
1063
1064 if (status_code != WLAN_STATUS_SUCCESS) {
1065 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1066 u8 algs[3];
1067 const int num_algs = ARRAY_SIZE(algs);
1068 int i, pos;
1069 algs[0] = algs[1] = algs[2] = 0xff;
1070 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1071 algs[0] = WLAN_AUTH_OPEN;
1072 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1073 algs[1] = WLAN_AUTH_SHARED_KEY;
1074 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1075 algs[2] = WLAN_AUTH_LEAP;
1076 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1077 pos = 0;
1078 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1079 pos = 1;
1080 else
1081 pos = 2;
1082 for (i = 0; i < num_algs; i++) {
1083 pos++;
1084 if (pos >= num_algs)
1085 pos = 0;
1086 if (algs[pos] == ifsta->auth_alg ||
1087 algs[pos] == 0xff)
1088 continue;
1089 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1090 !ieee80211_sta_wep_configured(sdata))
1091 continue;
1092 ifsta->auth_alg = algs[pos];
1093 break;
1094 }
1095 }
1096 return;
1097 }
1098
1099 switch (ifsta->auth_alg) {
1100 case WLAN_AUTH_OPEN:
1101 case WLAN_AUTH_LEAP:
1102 ieee80211_auth_completed(sdata, ifsta);
1103 break;
1104 case WLAN_AUTH_SHARED_KEY:
1105 if (ifsta->auth_transaction == 4)
1106 ieee80211_auth_completed(sdata, ifsta);
1107 else
1108 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1109 break;
1110 }
1111 }
1112
1113
1114 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1115 struct ieee80211_if_sta *ifsta,
1116 struct ieee80211_mgmt *mgmt,
1117 size_t len)
1118 {
1119 u16 reason_code;
1120
1121 if (len < 24 + 2)
1122 return;
1123
1124 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1125 return;
1126
1127 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1128
1129 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1130 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
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\n", sdata->dev->name);
1162
1163 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1164 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1165 mod_timer(&ifsta->timer, jiffies +
1166 IEEE80211_RETRY_AUTH_INTERVAL);
1167 }
1168
1169 ieee80211_set_disassoc(sdata, ifsta, false, false, 0);
1170 }
1171
1172
1173 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1174 struct ieee80211_if_sta *ifsta,
1175 struct ieee80211_mgmt *mgmt,
1176 size_t len,
1177 int reassoc)
1178 {
1179 struct ieee80211_local *local = sdata->local;
1180 struct ieee80211_supported_band *sband;
1181 struct sta_info *sta;
1182 u64 rates, basic_rates;
1183 u16 capab_info, status_code, aid;
1184 struct ieee802_11_elems elems;
1185 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1186 u8 *pos;
1187 int i, j;
1188 bool have_higher_than_11mbit = false;
1189
1190 /* AssocResp and ReassocResp have identical structure, so process both
1191 * of them in this function. */
1192
1193 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1194 return;
1195
1196 if (len < 24 + 6)
1197 return;
1198
1199 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1200 return;
1201
1202 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1203 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1204 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1205
1206 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1207 "status=%d aid=%d)\n",
1208 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1209 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1210
1211 if (status_code != WLAN_STATUS_SUCCESS) {
1212 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1213 sdata->dev->name, status_code);
1214 /* if this was a reassociation, ensure we try a "full"
1215 * association next time. This works around some broken APs
1216 * which do not correctly reject reassociation requests. */
1217 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1218 return;
1219 }
1220
1221 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1222 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1223 "set\n", sdata->dev->name, aid);
1224 aid &= ~(BIT(15) | BIT(14));
1225
1226 pos = mgmt->u.assoc_resp.variable;
1227 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1228
1229 if (!elems.supp_rates) {
1230 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1231 sdata->dev->name);
1232 return;
1233 }
1234
1235 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1236 ifsta->aid = aid;
1237 ifsta->ap_capab = capab_info;
1238
1239 kfree(ifsta->assocresp_ies);
1240 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1241 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1242 if (ifsta->assocresp_ies)
1243 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1244
1245 rcu_read_lock();
1246
1247 /* Add STA entry for the AP */
1248 sta = sta_info_get(local, ifsta->bssid);
1249 if (!sta) {
1250 struct ieee80211_bss *bss;
1251 int err;
1252
1253 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1254 if (!sta) {
1255 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1256 " the AP\n", sdata->dev->name);
1257 rcu_read_unlock();
1258 return;
1259 }
1260 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1261 local->hw.conf.channel->center_freq,
1262 ifsta->ssid, ifsta->ssid_len);
1263 if (bss) {
1264 sta->last_signal = bss->signal;
1265 sta->last_qual = bss->qual;
1266 sta->last_noise = bss->noise;
1267 ieee80211_rx_bss_put(local, bss);
1268 }
1269
1270 err = sta_info_insert(sta);
1271 if (err) {
1272 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1273 " the AP (error %d)\n", sdata->dev->name, err);
1274 rcu_read_unlock();
1275 return;
1276 }
1277 /* update new sta with its last rx activity */
1278 sta->last_rx = jiffies;
1279 }
1280
1281 /*
1282 * FIXME: Do we really need to update the sta_info's information here?
1283 * We already know about the AP (we found it in our list) so it
1284 * should already be filled with the right info, no?
1285 * As is stands, all this is racy because typically we assume
1286 * the information that is filled in here (except flags) doesn't
1287 * change while a STA structure is alive. As such, it should move
1288 * to between the sta_info_alloc() and sta_info_insert() above.
1289 */
1290
1291 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1292 WLAN_STA_AUTHORIZED);
1293
1294 rates = 0;
1295 basic_rates = 0;
1296 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1297
1298 for (i = 0; i < elems.supp_rates_len; i++) {
1299 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1300
1301 if (rate > 110)
1302 have_higher_than_11mbit = true;
1303
1304 for (j = 0; j < sband->n_bitrates; j++) {
1305 if (sband->bitrates[j].bitrate == rate)
1306 rates |= BIT(j);
1307 if (elems.supp_rates[i] & 0x80)
1308 basic_rates |= BIT(j);
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
1315 if (rate > 110)
1316 have_higher_than_11mbit = true;
1317
1318 for (j = 0; j < sband->n_bitrates; j++) {
1319 if (sband->bitrates[j].bitrate == rate)
1320 rates |= BIT(j);
1321 if (elems.ext_supp_rates[i] & 0x80)
1322 basic_rates |= BIT(j);
1323 }
1324 }
1325
1326 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1327 sdata->vif.bss_conf.basic_rates = basic_rates;
1328
1329 /* cf. IEEE 802.11 9.2.12 */
1330 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1331 have_higher_than_11mbit)
1332 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1333 else
1334 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1335
1336 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1337 (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1338 struct ieee80211_ht_bss_info bss_info;
1339 ieee80211_ht_cap_ie_to_sta_ht_cap(
1340 elems.ht_cap_elem, &sta->sta.ht_cap);
1341 ieee80211_ht_info_ie_to_ht_bss_info(
1342 elems.ht_info_elem, &bss_info);
1343 ieee80211_handle_ht(local, &sta->sta.ht_cap, &bss_info);
1344 }
1345
1346 rate_control_rate_init(sta);
1347
1348 if (elems.wmm_param) {
1349 set_sta_flags(sta, WLAN_STA_WME);
1350 rcu_read_unlock();
1351 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1352 elems.wmm_param_len);
1353 } else
1354 rcu_read_unlock();
1355
1356 /* set AID and assoc capability,
1357 * ieee80211_set_associated() will tell the driver */
1358 bss_conf->aid = aid;
1359 bss_conf->assoc_capability = capab_info;
1360 ieee80211_set_associated(sdata, ifsta);
1361
1362 ieee80211_associated(sdata, ifsta);
1363 }
1364
1365
1366 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1367 struct ieee80211_if_sta *ifsta,
1368 struct ieee80211_bss *bss)
1369 {
1370 struct ieee80211_local *local = sdata->local;
1371 int res, rates, i, j;
1372 struct sk_buff *skb;
1373 struct ieee80211_mgmt *mgmt;
1374 u8 *pos;
1375 struct ieee80211_supported_band *sband;
1376 union iwreq_data wrqu;
1377
1378 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1379
1380 /* Remove possible STA entries from other IBSS networks. */
1381 sta_info_flush_delayed(sdata);
1382
1383 if (local->ops->reset_tsf) {
1384 /* Reset own TSF to allow time synchronization work. */
1385 local->ops->reset_tsf(local_to_hw(local));
1386 }
1387 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1388 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1389 if (res)
1390 return res;
1391
1392 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1393
1394 sdata->drop_unencrypted = bss->capability &
1395 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1396
1397 res = ieee80211_set_freq(sdata, bss->freq);
1398
1399 if (res)
1400 return res;
1401
1402 /* Build IBSS probe response */
1403 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1404 if (skb) {
1405 skb_reserve(skb, local->hw.extra_tx_headroom);
1406
1407 mgmt = (struct ieee80211_mgmt *)
1408 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1409 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1410 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1411 IEEE80211_STYPE_PROBE_RESP);
1412 memset(mgmt->da, 0xff, ETH_ALEN);
1413 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1414 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1415 mgmt->u.beacon.beacon_int =
1416 cpu_to_le16(local->hw.conf.beacon_int);
1417 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1418 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1419
1420 pos = skb_put(skb, 2 + ifsta->ssid_len);
1421 *pos++ = WLAN_EID_SSID;
1422 *pos++ = ifsta->ssid_len;
1423 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1424
1425 rates = bss->supp_rates_len;
1426 if (rates > 8)
1427 rates = 8;
1428 pos = skb_put(skb, 2 + rates);
1429 *pos++ = WLAN_EID_SUPP_RATES;
1430 *pos++ = rates;
1431 memcpy(pos, bss->supp_rates, rates);
1432
1433 if (bss->band == IEEE80211_BAND_2GHZ) {
1434 pos = skb_put(skb, 2 + 1);
1435 *pos++ = WLAN_EID_DS_PARAMS;
1436 *pos++ = 1;
1437 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1438 }
1439
1440 pos = skb_put(skb, 2 + 2);
1441 *pos++ = WLAN_EID_IBSS_PARAMS;
1442 *pos++ = 2;
1443 /* FIX: set ATIM window based on scan results */
1444 *pos++ = 0;
1445 *pos++ = 0;
1446
1447 if (bss->supp_rates_len > 8) {
1448 rates = bss->supp_rates_len - 8;
1449 pos = skb_put(skb, 2 + rates);
1450 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1451 *pos++ = rates;
1452 memcpy(pos, &bss->supp_rates[8], rates);
1453 }
1454
1455 ifsta->probe_resp = skb;
1456
1457 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1458 }
1459
1460 rates = 0;
1461 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1462 for (i = 0; i < bss->supp_rates_len; i++) {
1463 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1464 for (j = 0; j < sband->n_bitrates; j++)
1465 if (sband->bitrates[j].bitrate == bitrate)
1466 rates |= BIT(j);
1467 }
1468 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1469
1470 ieee80211_sta_def_wmm_params(sdata, bss);
1471
1472 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1473 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1474
1475 ieee80211_led_assoc(local, true);
1476
1477 memset(&wrqu, 0, sizeof(wrqu));
1478 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1479 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1480
1481 return res;
1482 }
1483
1484 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1485 struct ieee80211_mgmt *mgmt,
1486 size_t len,
1487 struct ieee80211_rx_status *rx_status,
1488 struct ieee802_11_elems *elems,
1489 bool beacon)
1490 {
1491 struct ieee80211_local *local = sdata->local;
1492 int freq;
1493 struct ieee80211_bss *bss;
1494 struct sta_info *sta;
1495 struct ieee80211_channel *channel;
1496 u64 beacon_timestamp, rx_timestamp;
1497 u64 supp_rates = 0;
1498 enum ieee80211_band band = rx_status->band;
1499
1500 if (elems->ds_params && elems->ds_params_len == 1)
1501 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1502 else
1503 freq = rx_status->freq;
1504
1505 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1506
1507 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1508 return;
1509
1510 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1511 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1512 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1513
1514 rcu_read_lock();
1515
1516 sta = sta_info_get(local, mgmt->sa);
1517 if (sta) {
1518 u64 prev_rates;
1519
1520 prev_rates = sta->sta.supp_rates[band];
1521 /* make sure mandatory rates are always added */
1522 sta->sta.supp_rates[band] = supp_rates |
1523 ieee80211_mandatory_rates(local, band);
1524
1525 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1526 if (sta->sta.supp_rates[band] != prev_rates)
1527 printk(KERN_DEBUG "%s: updated supp_rates set "
1528 "for %pM based on beacon info (0x%llx | "
1529 "0x%llx -> 0x%llx)\n",
1530 sdata->dev->name,
1531 sta->sta.addr,
1532 (unsigned long long) prev_rates,
1533 (unsigned long long) supp_rates,
1534 (unsigned long long) sta->sta.supp_rates[band]);
1535 #endif
1536 } else {
1537 ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
1538 mgmt->sa, supp_rates);
1539 }
1540
1541 rcu_read_unlock();
1542 }
1543
1544 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1545 freq, beacon);
1546 if (!bss)
1547 return;
1548
1549 /* was just updated in ieee80211_bss_info_update */
1550 beacon_timestamp = bss->timestamp;
1551
1552 /*
1553 * In STA mode, the remaining parameters should not be overridden
1554 * by beacons because they're not necessarily accurate there.
1555 */
1556 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1557 bss->last_probe_resp && beacon) {
1558 ieee80211_rx_bss_put(local, bss);
1559 return;
1560 }
1561
1562 /* check if we need to merge IBSS */
1563 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1564 bss->capability & WLAN_CAPABILITY_IBSS &&
1565 bss->freq == local->oper_channel->center_freq &&
1566 elems->ssid_len == sdata->u.sta.ssid_len &&
1567 memcmp(elems->ssid, sdata->u.sta.ssid,
1568 sdata->u.sta.ssid_len) == 0) {
1569 if (rx_status->flag & RX_FLAG_TSFT) {
1570 /* in order for correct IBSS merging we need mactime
1571 *
1572 * since mactime is defined as the time the first data
1573 * symbol of the frame hits the PHY, and the timestamp
1574 * of the beacon is defined as "the time that the data
1575 * symbol containing the first bit of the timestamp is
1576 * transmitted to the PHY plus the transmitting STA’s
1577 * delays through its local PHY from the MAC-PHY
1578 * interface to its interface with the WM"
1579 * (802.11 11.1.2) - equals the time this bit arrives at
1580 * the receiver - we have to take into account the
1581 * offset between the two.
1582 * e.g: at 1 MBit that means mactime is 192 usec earlier
1583 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1584 */
1585 int rate = local->hw.wiphy->bands[band]->
1586 bitrates[rx_status->rate_idx].bitrate;
1587 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1588 } else if (local && local->ops && local->ops->get_tsf)
1589 /* second best option: get current TSF */
1590 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1591 else
1592 /* can't merge without knowing the TSF */
1593 rx_timestamp = -1LLU;
1594 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1595 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1596 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1597 mgmt->sa, mgmt->bssid,
1598 (unsigned long long)rx_timestamp,
1599 (unsigned long long)beacon_timestamp,
1600 (unsigned long long)(rx_timestamp - beacon_timestamp),
1601 jiffies);
1602 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1603 if (beacon_timestamp > rx_timestamp) {
1604 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1605 printk(KERN_DEBUG "%s: beacon TSF higher than "
1606 "local TSF - IBSS merge with BSSID %pM\n",
1607 sdata->dev->name, mgmt->bssid);
1608 #endif
1609 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1610 ieee80211_ibss_add_sta(sdata, NULL,
1611 mgmt->bssid, mgmt->sa,
1612 supp_rates);
1613 }
1614 }
1615
1616 ieee80211_rx_bss_put(local, bss);
1617 }
1618
1619
1620 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1621 struct ieee80211_mgmt *mgmt,
1622 size_t len,
1623 struct ieee80211_rx_status *rx_status)
1624 {
1625 size_t baselen;
1626 struct ieee802_11_elems elems;
1627 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1628
1629 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1630 return; /* ignore ProbeResp to foreign address */
1631
1632 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1633 if (baselen > len)
1634 return;
1635
1636 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1637 &elems);
1638
1639 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1640
1641 /* direct probe may be part of the association flow */
1642 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1643 &ifsta->request)) {
1644 printk(KERN_DEBUG "%s direct probe responded\n",
1645 sdata->dev->name);
1646 ieee80211_authenticate(sdata, ifsta);
1647 }
1648 }
1649
1650
1651 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1652 struct ieee80211_mgmt *mgmt,
1653 size_t len,
1654 struct ieee80211_rx_status *rx_status)
1655 {
1656 struct ieee80211_if_sta *ifsta;
1657 size_t baselen;
1658 struct ieee802_11_elems elems;
1659 struct ieee80211_local *local = sdata->local;
1660 struct ieee80211_conf *conf = &local->hw.conf;
1661 u32 changed = 0;
1662 bool erp_valid;
1663 u8 erp_value = 0;
1664
1665 /* Process beacon from the current BSS */
1666 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1667 if (baselen > len)
1668 return;
1669
1670 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1671
1672 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1673
1674 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1675 return;
1676 ifsta = &sdata->u.sta;
1677
1678 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1679 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1680 return;
1681
1682 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1683 elems.wmm_param_len);
1684
1685
1686 if (elems.erp_info && elems.erp_info_len >= 1) {
1687 erp_valid = true;
1688 erp_value = elems.erp_info[0];
1689 } else {
1690 erp_valid = false;
1691 }
1692 changed |= ieee80211_handle_bss_capability(sdata,
1693 le16_to_cpu(mgmt->u.beacon.capab_info),
1694 erp_valid, erp_value);
1695
1696 if (elems.ht_cap_elem && elems.ht_info_elem &&
1697 elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
1698 struct ieee80211_ht_bss_info bss_info;
1699
1700 ieee80211_ht_info_ie_to_ht_bss_info(
1701 elems.ht_info_elem, &bss_info);
1702 changed |= ieee80211_handle_ht(local, &conf->ht_cap,
1703 &bss_info);
1704 }
1705
1706 ieee80211_bss_info_change_notify(sdata, changed);
1707 }
1708
1709
1710 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1711 struct ieee80211_if_sta *ifsta,
1712 struct ieee80211_mgmt *mgmt,
1713 size_t len,
1714 struct ieee80211_rx_status *rx_status)
1715 {
1716 struct ieee80211_local *local = sdata->local;
1717 int tx_last_beacon;
1718 struct sk_buff *skb;
1719 struct ieee80211_mgmt *resp;
1720 u8 *pos, *end;
1721
1722 if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1723 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1724 len < 24 + 2 || !ifsta->probe_resp)
1725 return;
1726
1727 if (local->ops->tx_last_beacon)
1728 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1729 else
1730 tx_last_beacon = 1;
1731
1732 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1733 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1734 " (tx_last_beacon=%d)\n",
1735 sdata->dev->name, mgmt->sa, mgmt->da,
1736 mgmt->bssid, tx_last_beacon);
1737 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1738
1739 if (!tx_last_beacon)
1740 return;
1741
1742 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1743 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1744 return;
1745
1746 end = ((u8 *) mgmt) + len;
1747 pos = mgmt->u.probe_req.variable;
1748 if (pos[0] != WLAN_EID_SSID ||
1749 pos + 2 + pos[1] > end) {
1750 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1751 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1752 "from %pM\n",
1753 sdata->dev->name, mgmt->sa);
1754 #endif
1755 return;
1756 }
1757 if (pos[1] != 0 &&
1758 (pos[1] != ifsta->ssid_len ||
1759 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1760 /* Ignore ProbeReq for foreign SSID */
1761 return;
1762 }
1763
1764 /* Reply with ProbeResp */
1765 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1766 if (!skb)
1767 return;
1768
1769 resp = (struct ieee80211_mgmt *) skb->data;
1770 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1771 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1772 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1773 sdata->dev->name, resp->da);
1774 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1775 ieee80211_tx_skb(sdata, skb, 0);
1776 }
1777
1778 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1779 struct ieee80211_rx_status *rx_status)
1780 {
1781 struct ieee80211_local *local = sdata->local;
1782 struct ieee80211_if_sta *ifsta;
1783 struct ieee80211_mgmt *mgmt;
1784 u16 fc;
1785
1786 if (skb->len < 24)
1787 goto fail;
1788
1789 ifsta = &sdata->u.sta;
1790
1791 mgmt = (struct ieee80211_mgmt *) skb->data;
1792 fc = le16_to_cpu(mgmt->frame_control);
1793
1794 switch (fc & IEEE80211_FCTL_STYPE) {
1795 case IEEE80211_STYPE_PROBE_REQ:
1796 case IEEE80211_STYPE_PROBE_RESP:
1797 case IEEE80211_STYPE_BEACON:
1798 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1799 case IEEE80211_STYPE_AUTH:
1800 case IEEE80211_STYPE_ASSOC_RESP:
1801 case IEEE80211_STYPE_REASSOC_RESP:
1802 case IEEE80211_STYPE_DEAUTH:
1803 case IEEE80211_STYPE_DISASSOC:
1804 skb_queue_tail(&ifsta->skb_queue, skb);
1805 queue_work(local->hw.workqueue, &ifsta->work);
1806 return;
1807 }
1808
1809 fail:
1810 kfree_skb(skb);
1811 }
1812
1813 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1814 struct sk_buff *skb)
1815 {
1816 struct ieee80211_rx_status *rx_status;
1817 struct ieee80211_if_sta *ifsta;
1818 struct ieee80211_mgmt *mgmt;
1819 u16 fc;
1820
1821 ifsta = &sdata->u.sta;
1822
1823 rx_status = (struct ieee80211_rx_status *) skb->cb;
1824 mgmt = (struct ieee80211_mgmt *) skb->data;
1825 fc = le16_to_cpu(mgmt->frame_control);
1826
1827 switch (fc & IEEE80211_FCTL_STYPE) {
1828 case IEEE80211_STYPE_PROBE_REQ:
1829 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1830 rx_status);
1831 break;
1832 case IEEE80211_STYPE_PROBE_RESP:
1833 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1834 break;
1835 case IEEE80211_STYPE_BEACON:
1836 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1837 break;
1838 case IEEE80211_STYPE_AUTH:
1839 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1840 break;
1841 case IEEE80211_STYPE_ASSOC_RESP:
1842 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1843 break;
1844 case IEEE80211_STYPE_REASSOC_RESP:
1845 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1846 break;
1847 case IEEE80211_STYPE_DEAUTH:
1848 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1849 break;
1850 case IEEE80211_STYPE_DISASSOC:
1851 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1852 break;
1853 }
1854
1855 kfree_skb(skb);
1856 }
1857
1858
1859 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1860 {
1861 struct ieee80211_local *local = sdata->local;
1862 int active = 0;
1863 struct sta_info *sta;
1864
1865 rcu_read_lock();
1866
1867 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1868 if (sta->sdata == sdata &&
1869 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1870 jiffies)) {
1871 active++;
1872 break;
1873 }
1874 }
1875
1876 rcu_read_unlock();
1877
1878 return active;
1879 }
1880
1881
1882 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
1883 struct ieee80211_if_sta *ifsta)
1884 {
1885 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1886
1887 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
1888 if (ieee80211_sta_active_ibss(sdata))
1889 return;
1890
1891 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1892 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
1893 ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
1894 }
1895
1896
1897 static void ieee80211_sta_timer(unsigned long data)
1898 {
1899 struct ieee80211_sub_if_data *sdata =
1900 (struct ieee80211_sub_if_data *) data;
1901 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1902 struct ieee80211_local *local = sdata->local;
1903
1904 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1905 queue_work(local->hw.workqueue, &ifsta->work);
1906 }
1907
1908 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
1909 struct ieee80211_if_sta *ifsta)
1910 {
1911 struct ieee80211_local *local = sdata->local;
1912
1913 if (local->ops->reset_tsf) {
1914 /* Reset own TSF to allow time synchronization work. */
1915 local->ops->reset_tsf(local_to_hw(local));
1916 }
1917
1918 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1919
1920
1921 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1922 ifsta->auth_alg = WLAN_AUTH_OPEN;
1923 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1924 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
1925 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1926 ifsta->auth_alg = WLAN_AUTH_LEAP;
1927 else
1928 ifsta->auth_alg = WLAN_AUTH_OPEN;
1929 ifsta->auth_transaction = -1;
1930 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
1931 ifsta->assoc_scan_tries = 0;
1932 ifsta->direct_probe_tries = 0;
1933 ifsta->auth_tries = 0;
1934 ifsta->assoc_tries = 0;
1935 netif_tx_stop_all_queues(sdata->dev);
1936 netif_carrier_off(sdata->dev);
1937 }
1938
1939
1940 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
1941 const char *ssid, int ssid_len)
1942 {
1943 int tmp, hidden_ssid;
1944
1945 if (ssid_len == ifsta->ssid_len &&
1946 !memcmp(ifsta->ssid, ssid, ssid_len))
1947 return 1;
1948
1949 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1950 return 0;
1951
1952 hidden_ssid = 1;
1953 tmp = ssid_len;
1954 while (tmp--) {
1955 if (ssid[tmp] != '\0') {
1956 hidden_ssid = 0;
1957 break;
1958 }
1959 }
1960
1961 if (hidden_ssid && ifsta->ssid_len == ssid_len)
1962 return 1;
1963
1964 if (ssid_len == 1 && ssid[0] == ' ')
1965 return 1;
1966
1967 return 0;
1968 }
1969
1970 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
1971 struct ieee80211_if_sta *ifsta)
1972 {
1973 struct ieee80211_local *local = sdata->local;
1974 struct ieee80211_bss *bss;
1975 struct ieee80211_supported_band *sband;
1976 u8 bssid[ETH_ALEN], *pos;
1977 int i;
1978 int ret;
1979
1980 #if 0
1981 /* Easier testing, use fixed BSSID. */
1982 memset(bssid, 0xfe, ETH_ALEN);
1983 #else
1984 /* Generate random, not broadcast, locally administered BSSID. Mix in
1985 * own MAC address to make sure that devices that do not have proper
1986 * random number generator get different BSSID. */
1987 get_random_bytes(bssid, ETH_ALEN);
1988 for (i = 0; i < ETH_ALEN; i++)
1989 bssid[i] ^= sdata->dev->dev_addr[i];
1990 bssid[0] &= ~0x01;
1991 bssid[0] |= 0x02;
1992 #endif
1993
1994 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
1995 sdata->dev->name, bssid);
1996
1997 bss = ieee80211_rx_bss_add(local, bssid,
1998 local->hw.conf.channel->center_freq,
1999 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2000 if (!bss)
2001 return -ENOMEM;
2002
2003 bss->band = local->hw.conf.channel->band;
2004 sband = local->hw.wiphy->bands[bss->band];
2005
2006 if (local->hw.conf.beacon_int == 0)
2007 local->hw.conf.beacon_int = 100;
2008 bss->beacon_int = local->hw.conf.beacon_int;
2009 bss->last_update = jiffies;
2010 bss->capability = WLAN_CAPABILITY_IBSS;
2011
2012 if (sdata->default_key)
2013 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2014 else
2015 sdata->drop_unencrypted = 0;
2016
2017 bss->supp_rates_len = sband->n_bitrates;
2018 pos = bss->supp_rates;
2019 for (i = 0; i < sband->n_bitrates; i++) {
2020 int rate = sband->bitrates[i].bitrate;
2021 *pos++ = (u8) (rate / 5);
2022 }
2023
2024 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2025 ieee80211_rx_bss_put(local, bss);
2026 return ret;
2027 }
2028
2029
2030 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2031 struct ieee80211_if_sta *ifsta)
2032 {
2033 struct ieee80211_local *local = sdata->local;
2034 struct ieee80211_bss *bss;
2035 int found = 0;
2036 u8 bssid[ETH_ALEN];
2037 int active_ibss;
2038
2039 if (ifsta->ssid_len == 0)
2040 return -EINVAL;
2041
2042 active_ibss = ieee80211_sta_active_ibss(sdata);
2043 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2044 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2045 sdata->dev->name, active_ibss);
2046 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2047 spin_lock_bh(&local->bss_lock);
2048 list_for_each_entry(bss, &local->bss_list, list) {
2049 if (ifsta->ssid_len != bss->ssid_len ||
2050 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2051 || !(bss->capability & WLAN_CAPABILITY_IBSS))
2052 continue;
2053 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2054 printk(KERN_DEBUG " bssid=%pM found\n", bss->bssid);
2055 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2056 memcpy(bssid, bss->bssid, ETH_ALEN);
2057 found = 1;
2058 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2059 break;
2060 }
2061 spin_unlock_bh(&local->bss_lock);
2062
2063 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2064 if (found)
2065 printk(KERN_DEBUG " sta_find_ibss: selected %pM current "
2066 "%pM\n", bssid, ifsta->bssid);
2067 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2068
2069 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2070 int ret;
2071 int search_freq;
2072
2073 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2074 search_freq = bss->freq;
2075 else
2076 search_freq = local->hw.conf.channel->center_freq;
2077
2078 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2079 ifsta->ssid, ifsta->ssid_len);
2080 if (!bss)
2081 goto dont_join;
2082
2083 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2084 " based on configured SSID\n",
2085 sdata->dev->name, bssid);
2086 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2087 ieee80211_rx_bss_put(local, bss);
2088 return ret;
2089 }
2090
2091 dont_join:
2092 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2093 printk(KERN_DEBUG " did not try to join ibss\n");
2094 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2095
2096 /* Selected IBSS not found in current scan results - try to scan */
2097 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2098 !ieee80211_sta_active_ibss(sdata)) {
2099 mod_timer(&ifsta->timer, jiffies +
2100 IEEE80211_IBSS_MERGE_INTERVAL);
2101 } else if (time_after(jiffies, local->last_scan_completed +
2102 IEEE80211_SCAN_INTERVAL)) {
2103 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2104 "join\n", sdata->dev->name);
2105 return ieee80211_request_scan(sdata, ifsta->ssid,
2106 ifsta->ssid_len);
2107 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2108 int interval = IEEE80211_SCAN_INTERVAL;
2109
2110 if (time_after(jiffies, ifsta->ibss_join_req +
2111 IEEE80211_IBSS_JOIN_TIMEOUT)) {
2112 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2113 (!(local->oper_channel->flags &
2114 IEEE80211_CHAN_NO_IBSS)))
2115 return ieee80211_sta_create_ibss(sdata, ifsta);
2116 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2117 printk(KERN_DEBUG "%s: IBSS not allowed on"
2118 " %d MHz\n", sdata->dev->name,
2119 local->hw.conf.channel->center_freq);
2120 }
2121
2122 /* No IBSS found - decrease scan interval and continue
2123 * scanning. */
2124 interval = IEEE80211_SCAN_INTERVAL_SLOW;
2125 }
2126
2127 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2128 mod_timer(&ifsta->timer, jiffies + interval);
2129 return 0;
2130 }
2131
2132 return 0;
2133 }
2134
2135
2136 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2137 struct ieee80211_if_sta *ifsta)
2138 {
2139 struct ieee80211_local *local = sdata->local;
2140 struct ieee80211_bss *bss, *selected = NULL;
2141 int top_rssi = 0, freq;
2142
2143 spin_lock_bh(&local->bss_lock);
2144 freq = local->oper_channel->center_freq;
2145 list_for_each_entry(bss, &local->bss_list, list) {
2146 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2147 continue;
2148
2149 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2150 IEEE80211_STA_AUTO_BSSID_SEL |
2151 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2152 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2153 !!sdata->default_key))
2154 continue;
2155
2156 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2157 bss->freq != freq)
2158 continue;
2159
2160 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2161 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2162 continue;
2163
2164 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2165 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2166 continue;
2167
2168 if (!selected || top_rssi < bss->signal) {
2169 selected = bss;
2170 top_rssi = bss->signal;
2171 }
2172 }
2173 if (selected)
2174 atomic_inc(&selected->users);
2175 spin_unlock_bh(&local->bss_lock);
2176
2177 if (selected) {
2178 ieee80211_set_freq(sdata, selected->freq);
2179 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2180 ieee80211_sta_set_ssid(sdata, selected->ssid,
2181 selected->ssid_len);
2182 ieee80211_sta_set_bssid(sdata, selected->bssid);
2183 ieee80211_sta_def_wmm_params(sdata, selected);
2184
2185 /* Send out direct probe if no probe resp was received or
2186 * the one we have is outdated
2187 */
2188 if (!selected->last_probe_resp ||
2189 time_after(jiffies, selected->last_probe_resp
2190 + IEEE80211_SCAN_RESULT_EXPIRE))
2191 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2192 else
2193 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2194
2195 ieee80211_rx_bss_put(local, selected);
2196 ieee80211_sta_reset_auth(sdata, ifsta);
2197 return 0;
2198 } else {
2199 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2200 ifsta->assoc_scan_tries++;
2201 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2202 ieee80211_start_scan(sdata, NULL, 0);
2203 else
2204 ieee80211_start_scan(sdata, ifsta->ssid,
2205 ifsta->ssid_len);
2206 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2207 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2208 } else
2209 ifsta->state = IEEE80211_STA_MLME_DISABLED;
2210 }
2211 return -1;
2212 }
2213
2214
2215 static void ieee80211_sta_work(struct work_struct *work)
2216 {
2217 struct ieee80211_sub_if_data *sdata =
2218 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2219 struct ieee80211_local *local = sdata->local;
2220 struct ieee80211_if_sta *ifsta;
2221 struct sk_buff *skb;
2222
2223 if (!netif_running(sdata->dev))
2224 return;
2225
2226 if (local->sw_scanning || local->hw_scanning)
2227 return;
2228
2229 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2230 sdata->vif.type != NL80211_IFTYPE_ADHOC))
2231 return;
2232 ifsta = &sdata->u.sta;
2233
2234 while ((skb = skb_dequeue(&ifsta->skb_queue)))
2235 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2236
2237 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2238 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2239 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2240 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2241 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2242 ifsta->scan_ssid_len);
2243 return;
2244 }
2245
2246 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2247 if (ieee80211_sta_config_auth(sdata, ifsta))
2248 return;
2249 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2250 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2251 return;
2252
2253 switch (ifsta->state) {
2254 case IEEE80211_STA_MLME_DISABLED:
2255 break;
2256 case IEEE80211_STA_MLME_DIRECT_PROBE:
2257 ieee80211_direct_probe(sdata, ifsta);
2258 break;
2259 case IEEE80211_STA_MLME_AUTHENTICATE:
2260 ieee80211_authenticate(sdata, ifsta);
2261 break;
2262 case IEEE80211_STA_MLME_ASSOCIATE:
2263 ieee80211_associate(sdata, ifsta);
2264 break;
2265 case IEEE80211_STA_MLME_ASSOCIATED:
2266 ieee80211_associated(sdata, ifsta);
2267 break;
2268 case IEEE80211_STA_MLME_IBSS_SEARCH:
2269 ieee80211_sta_find_ibss(sdata, ifsta);
2270 break;
2271 case IEEE80211_STA_MLME_IBSS_JOINED:
2272 ieee80211_sta_merge_ibss(sdata, ifsta);
2273 break;
2274 default:
2275 WARN_ON(1);
2276 break;
2277 }
2278
2279 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2280 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2281 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2282
2283 ieee80211_set_disassoc(sdata, ifsta, false, true,
2284 WLAN_REASON_UNSPECIFIED);
2285 }
2286 }
2287
2288 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2289 {
2290 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2291 queue_work(sdata->local->hw.workqueue,
2292 &sdata->u.sta.work);
2293 }
2294
2295 /* interface setup */
2296 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2297 {
2298 struct ieee80211_if_sta *ifsta;
2299
2300 ifsta = &sdata->u.sta;
2301 INIT_WORK(&ifsta->work, ieee80211_sta_work);
2302 setup_timer(&ifsta->timer, ieee80211_sta_timer,
2303 (unsigned long) sdata);
2304 skb_queue_head_init(&ifsta->skb_queue);
2305
2306 ifsta->capab = WLAN_CAPABILITY_ESS;
2307 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2308 IEEE80211_AUTH_ALG_SHARED_KEY;
2309 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2310 IEEE80211_STA_AUTO_BSSID_SEL |
2311 IEEE80211_STA_AUTO_CHANNEL_SEL;
2312 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2313 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2314 }
2315
2316 /*
2317 * Add a new IBSS station, will also be called by the RX code when,
2318 * in IBSS mode, receiving a frame from a yet-unknown station, hence
2319 * must be callable in atomic context.
2320 */
2321 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2322 struct sk_buff *skb, u8 *bssid,
2323 u8 *addr, u64 supp_rates)
2324 {
2325 struct ieee80211_local *local = sdata->local;
2326 struct sta_info *sta;
2327 int band = local->hw.conf.channel->band;
2328
2329 /* TODO: Could consider removing the least recently used entry and
2330 * allow new one to be added. */
2331 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2332 if (net_ratelimit()) {
2333 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2334 "entry %pM\n", sdata->dev->name, addr);
2335 }
2336 return NULL;
2337 }
2338
2339 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2340 return NULL;
2341
2342 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2343 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2344 wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2345 #endif
2346
2347 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2348 if (!sta)
2349 return NULL;
2350
2351 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2352
2353 /* make sure mandatory rates are always added */
2354 sta->sta.supp_rates[band] = supp_rates |
2355 ieee80211_mandatory_rates(local, band);
2356
2357 rate_control_rate_init(sta);
2358
2359 if (sta_info_insert(sta))
2360 return NULL;
2361
2362 return sta;
2363 }
2364
2365 /* configuration hooks */
2366 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2367 struct ieee80211_if_sta *ifsta)
2368 {
2369 struct ieee80211_local *local = sdata->local;
2370
2371 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2372 return;
2373
2374 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2375 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2376 (ifsta->flags & (IEEE80211_STA_SSID_SET |
2377 IEEE80211_STA_AUTO_SSID_SEL))) {
2378
2379 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2380 ieee80211_set_disassoc(sdata, ifsta, true, true,
2381 WLAN_REASON_DEAUTH_LEAVING);
2382
2383 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2384 queue_work(local->hw.workqueue, &ifsta->work);
2385 }
2386 }
2387
2388 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2389 {
2390 struct ieee80211_if_sta *ifsta;
2391 int res;
2392
2393 if (len > IEEE80211_MAX_SSID_LEN)
2394 return -EINVAL;
2395
2396 ifsta = &sdata->u.sta;
2397
2398 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2399 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2400 memcpy(ifsta->ssid, ssid, len);
2401 ifsta->ssid_len = len;
2402 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2403
2404 res = 0;
2405 /*
2406 * Hack! MLME code needs to be cleaned up to have different
2407 * entry points for configuration and internal selection change
2408 */
2409 if (netif_running(sdata->dev))
2410 res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
2411 if (res) {
2412 printk(KERN_DEBUG "%s: Failed to config new SSID to "
2413 "the low-level driver\n", sdata->dev->name);
2414 return res;
2415 }
2416 }
2417
2418 if (len)
2419 ifsta->flags |= IEEE80211_STA_SSID_SET;
2420 else
2421 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2422
2423 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2424 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2425 ifsta->ibss_join_req = jiffies;
2426 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2427 return ieee80211_sta_find_ibss(sdata, ifsta);
2428 }
2429
2430 return 0;
2431 }
2432
2433 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2434 {
2435 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2436 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2437 *len = ifsta->ssid_len;
2438 return 0;
2439 }
2440
2441 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2442 {
2443 struct ieee80211_if_sta *ifsta;
2444 int res;
2445
2446 ifsta = &sdata->u.sta;
2447
2448 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2449 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2450 res = 0;
2451 /*
2452 * Hack! See also ieee80211_sta_set_ssid.
2453 */
2454 if (netif_running(sdata->dev))
2455 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2456 if (res) {
2457 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2458 "the low-level driver\n", sdata->dev->name);
2459 return res;
2460 }
2461 }
2462
2463 if (is_valid_ether_addr(bssid))
2464 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2465 else
2466 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2467
2468 return 0;
2469 }
2470
2471 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2472 {
2473 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2474
2475 kfree(ifsta->extra_ie);
2476 if (len == 0) {
2477 ifsta->extra_ie = NULL;
2478 ifsta->extra_ie_len = 0;
2479 return 0;
2480 }
2481 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2482 if (!ifsta->extra_ie) {
2483 ifsta->extra_ie_len = 0;
2484 return -ENOMEM;
2485 }
2486 memcpy(ifsta->extra_ie, ie, len);
2487 ifsta->extra_ie_len = len;
2488 return 0;
2489 }
2490
2491 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2492 {
2493 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2494
2495 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2496 sdata->dev->name, reason);
2497
2498 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2499 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2500 return -EINVAL;
2501
2502 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2503 return 0;
2504 }
2505
2506 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2507 {
2508 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2509
2510 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2511 sdata->dev->name, reason);
2512
2513 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2514 return -EINVAL;
2515
2516 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2517 return -1;
2518
2519 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2520 return 0;
2521 }
2522
2523 /* scan finished notification */
2524 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2525 {
2526 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2527 struct ieee80211_if_sta *ifsta;
2528
2529 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2530 ifsta = &sdata->u.sta;
2531 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2532 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2533 !ieee80211_sta_active_ibss(sdata)))
2534 ieee80211_sta_find_ibss(sdata, ifsta);
2535 }
2536
2537 /* Restart STA timers */
2538 rcu_read_lock();
2539 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2540 ieee80211_restart_sta_timer(sdata);
2541 rcu_read_unlock();
2542 }
2543
2544 /* driver notification call */
2545 void ieee80211_notify_mac(struct ieee80211_hw *hw,
2546 enum ieee80211_notification_types notif_type)
2547 {
2548 struct ieee80211_local *local = hw_to_local(hw);
2549 struct ieee80211_sub_if_data *sdata;
2550
2551 switch (notif_type) {
2552 case IEEE80211_NOTIFY_RE_ASSOC:
2553 rcu_read_lock();
2554 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2555 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2556 continue;
2557
2558 ieee80211_sta_req_auth(sdata, &sdata->u.sta);
2559 }
2560 rcu_read_unlock();
2561 break;
2562 }
2563 }
2564 EXPORT_SYMBOL(ieee80211_notify_mac);
Linux kernel - Deliverables
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