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mac80211: Report rejected association to user space SME
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.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/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <net/mac80211.h>
21 #include <asm/unaligned.h>
22
23 #include "ieee80211_i.h"
24 #include "rate.h"
25 #include "led.h"
26
27 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
28 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
29 #define IEEE80211_AUTH_MAX_TRIES 3
30 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
31 #define IEEE80211_ASSOC_MAX_TRIES 3
32 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
33 #define IEEE80211_PROBE_IDLE_TIME (60 * HZ)
34 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
35
36 /* utils */
37 static int ecw2cw(int ecw)
38 {
39 return (1 << ecw) - 1;
40 }
41
42 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
43 {
44 u8 *end, *pos;
45
46 pos = bss->cbss.information_elements;
47 if (pos == NULL)
48 return NULL;
49 end = pos + bss->cbss.len_information_elements;
50
51 while (pos + 1 < end) {
52 if (pos + 2 + pos[1] > end)
53 break;
54 if (pos[0] == ie)
55 return pos;
56 pos += 2 + pos[1];
57 }
58
59 return NULL;
60 }
61
62 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
63 struct ieee80211_supported_band *sband,
64 u32 *rates)
65 {
66 int i, j, count;
67 *rates = 0;
68 count = 0;
69 for (i = 0; i < bss->supp_rates_len; i++) {
70 int rate = (bss->supp_rates[i] & 0x7F) * 5;
71
72 for (j = 0; j < sband->n_bitrates; j++)
73 if (sband->bitrates[j].bitrate == rate) {
74 *rates |= BIT(j);
75 count++;
76 break;
77 }
78 }
79
80 return count;
81 }
82
83 /*
84 * ieee80211_enable_ht should be called only after the operating band
85 * has been determined as ht configuration depends on the hw's
86 * HT abilities for a specific band.
87 */
88 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
89 struct ieee80211_ht_info *hti,
90 u16 ap_ht_cap_flags)
91 {
92 struct ieee80211_local *local = sdata->local;
93 struct ieee80211_supported_band *sband;
94 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
95 struct ieee80211_bss_ht_conf ht;
96 struct sta_info *sta;
97 u32 changed = 0;
98 bool enable_ht = true, ht_changed;
99 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
100
101 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
102
103 memset(&ht, 0, sizeof(ht));
104
105 /* HT is not supported */
106 if (!sband->ht_cap.ht_supported)
107 enable_ht = false;
108
109 /* check that channel matches the right operating channel */
110 if (local->hw.conf.channel->center_freq !=
111 ieee80211_channel_to_frequency(hti->control_chan))
112 enable_ht = false;
113
114 if (enable_ht) {
115 channel_type = NL80211_CHAN_HT20;
116
117 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
118 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
119 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
120 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
121 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
122 channel_type = NL80211_CHAN_HT40PLUS;
123 break;
124 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
125 channel_type = NL80211_CHAN_HT40MINUS;
126 break;
127 }
128 }
129 }
130
131 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
132 channel_type != local->hw.conf.channel_type;
133
134 local->oper_channel_type = channel_type;
135
136 if (ht_changed) {
137 /* channel_type change automatically detected */
138 ieee80211_hw_config(local, 0);
139
140 rcu_read_lock();
141
142 sta = sta_info_get(local, ifmgd->bssid);
143 if (sta)
144 rate_control_rate_update(local, sband, sta,
145 IEEE80211_RC_HT_CHANGED);
146
147 rcu_read_unlock();
148
149 }
150
151 /* disable HT */
152 if (!enable_ht)
153 return 0;
154
155 ht.operation_mode = le16_to_cpu(hti->operation_mode);
156
157 /* if bss configuration changed store the new one */
158 if (memcmp(&sdata->vif.bss_conf.ht, &ht, sizeof(ht))) {
159 changed |= BSS_CHANGED_HT;
160 sdata->vif.bss_conf.ht = ht;
161 }
162
163 return changed;
164 }
165
166 /* frame sending functions */
167
168 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
169 {
170 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
171 struct ieee80211_local *local = sdata->local;
172 struct sk_buff *skb;
173 struct ieee80211_mgmt *mgmt;
174 u8 *pos, *ies, *ht_ie;
175 int i, len, count, rates_len, supp_rates_len;
176 u16 capab;
177 struct ieee80211_bss *bss;
178 int wmm = 0;
179 struct ieee80211_supported_band *sband;
180 u32 rates = 0;
181
182 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
183 sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
184 ifmgd->ssid_len);
185 if (!skb) {
186 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
187 "frame\n", sdata->dev->name);
188 return;
189 }
190 skb_reserve(skb, local->hw.extra_tx_headroom);
191
192 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
193
194 capab = ifmgd->capab;
195
196 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
197 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
198 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
199 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
200 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
201 }
202
203 bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
204 local->hw.conf.channel->center_freq,
205 ifmgd->ssid, ifmgd->ssid_len);
206 if (bss) {
207 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
208 capab |= WLAN_CAPABILITY_PRIVACY;
209 if (bss->wmm_used)
210 wmm = 1;
211
212 /* get all rates supported by the device and the AP as
213 * some APs don't like getting a superset of their rates
214 * in the association request (e.g. D-Link DAP 1353 in
215 * b-only mode) */
216 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
217
218 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
219 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
220 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
221
222 ieee80211_rx_bss_put(local, bss);
223 } else {
224 rates = ~0;
225 rates_len = sband->n_bitrates;
226 }
227
228 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
229 memset(mgmt, 0, 24);
230 memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
231 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
232 memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
233
234 if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
235 skb_put(skb, 10);
236 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
237 IEEE80211_STYPE_REASSOC_REQ);
238 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
239 mgmt->u.reassoc_req.listen_interval =
240 cpu_to_le16(local->hw.conf.listen_interval);
241 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
242 ETH_ALEN);
243 } else {
244 skb_put(skb, 4);
245 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
246 IEEE80211_STYPE_ASSOC_REQ);
247 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
248 mgmt->u.assoc_req.listen_interval =
249 cpu_to_le16(local->hw.conf.listen_interval);
250 }
251
252 /* SSID */
253 ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
254 *pos++ = WLAN_EID_SSID;
255 *pos++ = ifmgd->ssid_len;
256 memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
257
258 /* add all rates which were marked to be used above */
259 supp_rates_len = rates_len;
260 if (supp_rates_len > 8)
261 supp_rates_len = 8;
262
263 len = sband->n_bitrates;
264 pos = skb_put(skb, supp_rates_len + 2);
265 *pos++ = WLAN_EID_SUPP_RATES;
266 *pos++ = supp_rates_len;
267
268 count = 0;
269 for (i = 0; i < sband->n_bitrates; i++) {
270 if (BIT(i) & rates) {
271 int rate = sband->bitrates[i].bitrate;
272 *pos++ = (u8) (rate / 5);
273 if (++count == 8)
274 break;
275 }
276 }
277
278 if (rates_len > count) {
279 pos = skb_put(skb, rates_len - count + 2);
280 *pos++ = WLAN_EID_EXT_SUPP_RATES;
281 *pos++ = rates_len - count;
282
283 for (i++; i < sband->n_bitrates; i++) {
284 if (BIT(i) & rates) {
285 int rate = sband->bitrates[i].bitrate;
286 *pos++ = (u8) (rate / 5);
287 }
288 }
289 }
290
291 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
292 /* 1. power capabilities */
293 pos = skb_put(skb, 4);
294 *pos++ = WLAN_EID_PWR_CAPABILITY;
295 *pos++ = 2;
296 *pos++ = 0; /* min tx power */
297 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
298
299 /* 2. supported channels */
300 /* TODO: get this in reg domain format */
301 pos = skb_put(skb, 2 * sband->n_channels + 2);
302 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
303 *pos++ = 2 * sband->n_channels;
304 for (i = 0; i < sband->n_channels; i++) {
305 *pos++ = ieee80211_frequency_to_channel(
306 sband->channels[i].center_freq);
307 *pos++ = 1; /* one channel in the subband*/
308 }
309 }
310
311 if (ifmgd->extra_ie) {
312 pos = skb_put(skb, ifmgd->extra_ie_len);
313 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
314 }
315
316 if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
317 pos = skb_put(skb, 9);
318 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
319 *pos++ = 7; /* len */
320 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
321 *pos++ = 0x50;
322 *pos++ = 0xf2;
323 *pos++ = 2; /* WME */
324 *pos++ = 0; /* WME info */
325 *pos++ = 1; /* WME ver */
326 *pos++ = 0;
327 }
328
329 /* wmm support is a must to HT */
330 /*
331 * IEEE802.11n does not allow TKIP/WEP as pairwise
332 * ciphers in HT mode. We still associate in non-ht
333 * mode (11a/b/g) if any one of these ciphers is
334 * configured as pairwise.
335 */
336 if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
337 sband->ht_cap.ht_supported &&
338 (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
339 ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
340 (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
341 struct ieee80211_ht_info *ht_info =
342 (struct ieee80211_ht_info *)(ht_ie + 2);
343 u16 cap = sband->ht_cap.cap;
344 __le16 tmp;
345 u32 flags = local->hw.conf.channel->flags;
346
347 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
348 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
349 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
350 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
351 cap &= ~IEEE80211_HT_CAP_SGI_40;
352 }
353 break;
354 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
355 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
356 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
357 cap &= ~IEEE80211_HT_CAP_SGI_40;
358 }
359 break;
360 }
361
362 tmp = cpu_to_le16(cap);
363 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
364 *pos++ = WLAN_EID_HT_CAPABILITY;
365 *pos++ = sizeof(struct ieee80211_ht_cap);
366 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
367 memcpy(pos, &tmp, sizeof(u16));
368 pos += sizeof(u16);
369 /* TODO: needs a define here for << 2 */
370 *pos++ = sband->ht_cap.ampdu_factor |
371 (sband->ht_cap.ampdu_density << 2);
372 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
373 }
374
375 kfree(ifmgd->assocreq_ies);
376 ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
377 ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
378 if (ifmgd->assocreq_ies)
379 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
380
381 ieee80211_tx_skb(sdata, skb, 0);
382 }
383
384
385 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
386 u16 stype, u16 reason)
387 {
388 struct ieee80211_local *local = sdata->local;
389 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
390 struct sk_buff *skb;
391 struct ieee80211_mgmt *mgmt;
392
393 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
394 if (!skb) {
395 printk(KERN_DEBUG "%s: failed to allocate buffer for "
396 "deauth/disassoc frame\n", sdata->dev->name);
397 return;
398 }
399 skb_reserve(skb, local->hw.extra_tx_headroom);
400
401 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
402 memset(mgmt, 0, 24);
403 memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
404 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
405 memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
406 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
407 skb_put(skb, 2);
408 /* u.deauth.reason_code == u.disassoc.reason_code */
409 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
410
411 if (stype == IEEE80211_STYPE_DEAUTH)
412 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len);
413 else
414 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len);
415 ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
416 }
417
418 void ieee80211_send_pspoll(struct ieee80211_local *local,
419 struct ieee80211_sub_if_data *sdata)
420 {
421 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
422 struct ieee80211_pspoll *pspoll;
423 struct sk_buff *skb;
424 u16 fc;
425
426 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
427 if (!skb) {
428 printk(KERN_DEBUG "%s: failed to allocate buffer for "
429 "pspoll frame\n", sdata->dev->name);
430 return;
431 }
432 skb_reserve(skb, local->hw.extra_tx_headroom);
433
434 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
435 memset(pspoll, 0, sizeof(*pspoll));
436 fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
437 pspoll->frame_control = cpu_to_le16(fc);
438 pspoll->aid = cpu_to_le16(ifmgd->aid);
439
440 /* aid in PS-Poll has its two MSBs each set to 1 */
441 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
442
443 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
444 memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
445
446 ieee80211_tx_skb(sdata, skb, 0);
447 }
448
449 /* MLME */
450 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
451 struct ieee80211_if_managed *ifmgd,
452 u8 *wmm_param, size_t wmm_param_len)
453 {
454 struct ieee80211_tx_queue_params params;
455 size_t left;
456 int count;
457 u8 *pos;
458
459 if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
460 return;
461
462 if (!wmm_param)
463 return;
464
465 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
466 return;
467 count = wmm_param[6] & 0x0f;
468 if (count == ifmgd->wmm_last_param_set)
469 return;
470 ifmgd->wmm_last_param_set = count;
471
472 pos = wmm_param + 8;
473 left = wmm_param_len - 8;
474
475 memset(&params, 0, sizeof(params));
476
477 local->wmm_acm = 0;
478 for (; left >= 4; left -= 4, pos += 4) {
479 int aci = (pos[0] >> 5) & 0x03;
480 int acm = (pos[0] >> 4) & 0x01;
481 int queue;
482
483 switch (aci) {
484 case 1: /* AC_BK */
485 queue = 3;
486 if (acm)
487 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
488 break;
489 case 2: /* AC_VI */
490 queue = 1;
491 if (acm)
492 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
493 break;
494 case 3: /* AC_VO */
495 queue = 0;
496 if (acm)
497 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
498 break;
499 case 0: /* AC_BE */
500 default:
501 queue = 2;
502 if (acm)
503 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
504 break;
505 }
506
507 params.aifs = pos[0] & 0x0f;
508 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
509 params.cw_min = ecw2cw(pos[1] & 0x0f);
510 params.txop = get_unaligned_le16(pos + 2);
511 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
512 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
513 "cWmin=%d cWmax=%d txop=%d\n",
514 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
515 params.cw_max, params.txop);
516 #endif
517 if (local->ops->conf_tx &&
518 local->ops->conf_tx(local_to_hw(local), queue, &params)) {
519 printk(KERN_DEBUG "%s: failed to set TX queue "
520 "parameters for queue %d\n", local->mdev->name, queue);
521 }
522 }
523 }
524
525 static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
526 {
527 u8 mask;
528 u8 index, indexn1, indexn2;
529 struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
530
531 if (unlikely(!tim || elems->tim_len < 4))
532 return false;
533
534 aid &= 0x3fff;
535 index = aid / 8;
536 mask = 1 << (aid & 7);
537
538 indexn1 = tim->bitmap_ctrl & 0xfe;
539 indexn2 = elems->tim_len + indexn1 - 4;
540
541 if (index < indexn1 || index > indexn2)
542 return false;
543
544 index -= indexn1;
545
546 return !!(tim->virtual_map[index] & mask);
547 }
548
549 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
550 u16 capab, bool erp_valid, u8 erp)
551 {
552 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
553 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
554 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
555 #endif
556 u32 changed = 0;
557 bool use_protection;
558 bool use_short_preamble;
559 bool use_short_slot;
560
561 if (erp_valid) {
562 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
563 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
564 } else {
565 use_protection = false;
566 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
567 }
568
569 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
570
571 if (use_protection != bss_conf->use_cts_prot) {
572 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
573 if (net_ratelimit()) {
574 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
575 sdata->dev->name,
576 use_protection ? "enabled" : "disabled",
577 ifmgd->bssid);
578 }
579 #endif
580 bss_conf->use_cts_prot = use_protection;
581 changed |= BSS_CHANGED_ERP_CTS_PROT;
582 }
583
584 if (use_short_preamble != bss_conf->use_short_preamble) {
585 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
586 if (net_ratelimit()) {
587 printk(KERN_DEBUG "%s: switched to %s barker preamble"
588 " (BSSID=%pM)\n",
589 sdata->dev->name,
590 use_short_preamble ? "short" : "long",
591 ifmgd->bssid);
592 }
593 #endif
594 bss_conf->use_short_preamble = use_short_preamble;
595 changed |= BSS_CHANGED_ERP_PREAMBLE;
596 }
597
598 if (use_short_slot != bss_conf->use_short_slot) {
599 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
600 if (net_ratelimit()) {
601 printk(KERN_DEBUG "%s: switched to %s slot time"
602 " (BSSID=%pM)\n",
603 sdata->dev->name,
604 use_short_slot ? "short" : "long",
605 ifmgd->bssid);
606 }
607 #endif
608 bss_conf->use_short_slot = use_short_slot;
609 changed |= BSS_CHANGED_ERP_SLOT;
610 }
611
612 return changed;
613 }
614
615 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
616 {
617 union iwreq_data wrqu;
618
619 memset(&wrqu, 0, sizeof(wrqu));
620 if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
621 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
622 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
623 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
624 }
625
626 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
627 {
628 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
629 char *buf;
630 size_t len;
631 int i;
632 union iwreq_data wrqu;
633
634 if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
635 return;
636
637 buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
638 ifmgd->assocresp_ies_len), GFP_KERNEL);
639 if (!buf)
640 return;
641
642 len = sprintf(buf, "ASSOCINFO(");
643 if (ifmgd->assocreq_ies) {
644 len += sprintf(buf + len, "ReqIEs=");
645 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
646 len += sprintf(buf + len, "%02x",
647 ifmgd->assocreq_ies[i]);
648 }
649 }
650 if (ifmgd->assocresp_ies) {
651 if (ifmgd->assocreq_ies)
652 len += sprintf(buf + len, " ");
653 len += sprintf(buf + len, "RespIEs=");
654 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
655 len += sprintf(buf + len, "%02x",
656 ifmgd->assocresp_ies[i]);
657 }
658 }
659 len += sprintf(buf + len, ")");
660
661 if (len > IW_CUSTOM_MAX) {
662 len = sprintf(buf, "ASSOCRESPIE=");
663 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
664 len += sprintf(buf + len, "%02x",
665 ifmgd->assocresp_ies[i]);
666 }
667 }
668
669 if (len <= IW_CUSTOM_MAX) {
670 memset(&wrqu, 0, sizeof(wrqu));
671 wrqu.data.length = len;
672 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
673 }
674
675 kfree(buf);
676 }
677
678
679 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
680 u32 bss_info_changed)
681 {
682 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
683 struct ieee80211_local *local = sdata->local;
684 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
685
686 struct ieee80211_bss *bss;
687
688 bss_info_changed |= BSS_CHANGED_ASSOC;
689 ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
690
691 bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
692 conf->channel->center_freq,
693 ifmgd->ssid, ifmgd->ssid_len);
694 if (bss) {
695 /* set timing information */
696 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
697 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
698 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
699
700 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
701 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
702
703 cfg80211_hold_bss(&bss->cbss);
704
705 ieee80211_rx_bss_put(local, bss);
706 }
707
708 ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
709 memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
710 ieee80211_sta_send_associnfo(sdata);
711
712 ifmgd->last_probe = jiffies;
713 ieee80211_led_assoc(local, 1);
714
715 sdata->vif.bss_conf.assoc = 1;
716 /*
717 * For now just always ask the driver to update the basic rateset
718 * when we have associated, we aren't checking whether it actually
719 * changed or not.
720 */
721 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
722 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
723
724 if (local->powersave) {
725 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
726 local->hw.conf.dynamic_ps_timeout > 0) {
727 mod_timer(&local->dynamic_ps_timer, jiffies +
728 msecs_to_jiffies(
729 local->hw.conf.dynamic_ps_timeout));
730 } else {
731 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
732 ieee80211_send_nullfunc(local, sdata, 1);
733 conf->flags |= IEEE80211_CONF_PS;
734 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
735 }
736 }
737
738 netif_tx_start_all_queues(sdata->dev);
739 netif_carrier_on(sdata->dev);
740
741 ieee80211_sta_send_apinfo(sdata);
742 }
743
744 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
745 {
746 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
747 struct ieee80211_local *local = sdata->local;
748
749 ifmgd->direct_probe_tries++;
750 if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
751 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
752 sdata->dev->name, ifmgd->bssid);
753 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
754 ieee80211_sta_send_apinfo(sdata);
755
756 /*
757 * Most likely AP is not in the range so remove the
758 * bss information associated to the AP
759 */
760 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
761 sdata->local->hw.conf.channel->center_freq,
762 ifmgd->ssid, ifmgd->ssid_len);
763
764 /*
765 * We might have a pending scan which had no chance to run yet
766 * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
767 * Hence, queue the STAs work again
768 */
769 queue_work(local->hw.workqueue, &ifmgd->work);
770 return;
771 }
772
773 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
774 sdata->dev->name, ifmgd->bssid,
775 ifmgd->direct_probe_tries);
776
777 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
778
779 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifmgd->request);
780
781 /* Direct probe is sent to broadcast address as some APs
782 * will not answer to direct packet in unassociated state.
783 */
784 ieee80211_send_probe_req(sdata, NULL,
785 ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
786
787 mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
788 }
789
790
791 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
792 {
793 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
794 struct ieee80211_local *local = sdata->local;
795 u8 *ies;
796 size_t ies_len;
797
798 ifmgd->auth_tries++;
799 if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
800 printk(KERN_DEBUG "%s: authentication with AP %pM"
801 " timed out\n",
802 sdata->dev->name, ifmgd->bssid);
803 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
804 ieee80211_sta_send_apinfo(sdata);
805 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
806 sdata->local->hw.conf.channel->center_freq,
807 ifmgd->ssid, ifmgd->ssid_len);
808
809 /*
810 * We might have a pending scan which had no chance to run yet
811 * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
812 * Hence, queue the STAs work again
813 */
814 queue_work(local->hw.workqueue, &ifmgd->work);
815 return;
816 }
817
818 ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
819 printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
820 sdata->dev->name, ifmgd->bssid);
821
822 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
823 ies = ifmgd->sme_auth_ie;
824 ies_len = ifmgd->sme_auth_ie_len;
825 } else {
826 ies = NULL;
827 ies_len = 0;
828 }
829 ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
830 ifmgd->bssid, 0);
831 ifmgd->auth_transaction = 2;
832
833 mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
834 }
835
836 /*
837 * The disassoc 'reason' argument can be either our own reason
838 * if self disconnected or a reason code from the AP.
839 */
840 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
841 bool deauth, bool self_disconnected,
842 u16 reason)
843 {
844 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
845 struct ieee80211_local *local = sdata->local;
846 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
847 struct ieee80211_bss *bss;
848 struct sta_info *sta;
849 u32 changed = 0, config_changed = 0;
850
851 rcu_read_lock();
852
853 sta = sta_info_get(local, ifmgd->bssid);
854 if (!sta) {
855 rcu_read_unlock();
856 return;
857 }
858
859 if (deauth) {
860 ifmgd->direct_probe_tries = 0;
861 ifmgd->auth_tries = 0;
862 }
863 ifmgd->assoc_scan_tries = 0;
864 ifmgd->assoc_tries = 0;
865
866 netif_tx_stop_all_queues(sdata->dev);
867 netif_carrier_off(sdata->dev);
868
869 ieee80211_sta_tear_down_BA_sessions(sta);
870
871 bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
872 conf->channel->center_freq,
873 ifmgd->ssid, ifmgd->ssid_len);
874
875 if (bss) {
876 cfg80211_unhold_bss(&bss->cbss);
877 ieee80211_rx_bss_put(local, bss);
878 }
879
880 if (self_disconnected) {
881 if (deauth)
882 ieee80211_send_deauth_disassoc(sdata,
883 IEEE80211_STYPE_DEAUTH, reason);
884 else
885 ieee80211_send_deauth_disassoc(sdata,
886 IEEE80211_STYPE_DISASSOC, reason);
887 }
888
889 ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
890 changed |= ieee80211_reset_erp_info(sdata);
891
892 ieee80211_led_assoc(local, 0);
893 changed |= BSS_CHANGED_ASSOC;
894 sdata->vif.bss_conf.assoc = false;
895
896 ieee80211_sta_send_apinfo(sdata);
897
898 if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
899 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
900 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
901 sdata->local->hw.conf.channel->center_freq,
902 ifmgd->ssid, ifmgd->ssid_len);
903 }
904
905 rcu_read_unlock();
906
907 /* channel(_type) changes are handled by ieee80211_hw_config */
908 local->oper_channel_type = NL80211_CHAN_NO_HT;
909
910 local->power_constr_level = 0;
911
912 del_timer_sync(&local->dynamic_ps_timer);
913 cancel_work_sync(&local->dynamic_ps_enable_work);
914
915 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
916 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
917 config_changed |= IEEE80211_CONF_CHANGE_PS;
918 }
919
920 ieee80211_hw_config(local, config_changed);
921 ieee80211_bss_info_change_notify(sdata, changed);
922
923 rcu_read_lock();
924
925 sta = sta_info_get(local, ifmgd->bssid);
926 if (!sta) {
927 rcu_read_unlock();
928 return;
929 }
930
931 sta_info_unlink(&sta);
932
933 rcu_read_unlock();
934
935 sta_info_destroy(sta);
936 }
937
938 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
939 {
940 if (!sdata || !sdata->default_key ||
941 sdata->default_key->conf.alg != ALG_WEP)
942 return 0;
943 return 1;
944 }
945
946 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
947 {
948 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
949 struct ieee80211_local *local = sdata->local;
950 struct ieee80211_bss *bss;
951 int bss_privacy;
952 int wep_privacy;
953 int privacy_invoked;
954
955 if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
956 return 0;
957
958 bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
959 local->hw.conf.channel->center_freq,
960 ifmgd->ssid, ifmgd->ssid_len);
961 if (!bss)
962 return 0;
963
964 bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
965 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
966 privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
967
968 ieee80211_rx_bss_put(local, bss);
969
970 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
971 return 0;
972
973 return 1;
974 }
975
976 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
977 {
978 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
979 struct ieee80211_local *local = sdata->local;
980
981 ifmgd->assoc_tries++;
982 if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
983 printk(KERN_DEBUG "%s: association with AP %pM"
984 " timed out\n",
985 sdata->dev->name, ifmgd->bssid);
986 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
987 ieee80211_sta_send_apinfo(sdata);
988 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
989 sdata->local->hw.conf.channel->center_freq,
990 ifmgd->ssid, ifmgd->ssid_len);
991 /*
992 * We might have a pending scan which had no chance to run yet
993 * due to state == IEEE80211_STA_MLME_ASSOCIATE.
994 * Hence, queue the STAs work again
995 */
996 queue_work(local->hw.workqueue, &ifmgd->work);
997 return;
998 }
999
1000 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1001 printk(KERN_DEBUG "%s: associate with AP %pM\n",
1002 sdata->dev->name, ifmgd->bssid);
1003 if (ieee80211_privacy_mismatch(sdata)) {
1004 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1005 "mixed-cell disabled - abort association\n", sdata->dev->name);
1006 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1007 return;
1008 }
1009
1010 ieee80211_send_assoc(sdata);
1011
1012 mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1013 }
1014
1015 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1016 struct ieee80211_hdr *hdr)
1017 {
1018 /*
1019 * We can postpone the mgd.timer whenever receiving unicast frames
1020 * from AP because we know that the connection is working both ways
1021 * at that time. But multicast frames (and hence also beacons) must
1022 * be ignored here, because we need to trigger the timer during
1023 * data idle periods for sending the periodical probe request to
1024 * the AP.
1025 */
1026 if (!is_multicast_ether_addr(hdr->addr1))
1027 mod_timer(&sdata->u.mgd.timer,
1028 jiffies + IEEE80211_MONITORING_INTERVAL);
1029 }
1030
1031 void ieee80211_beacon_loss_work(struct work_struct *work)
1032 {
1033 struct ieee80211_sub_if_data *sdata =
1034 container_of(work, struct ieee80211_sub_if_data,
1035 u.mgd.beacon_loss_work);
1036 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1037
1038 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1039 if (net_ratelimit()) {
1040 printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "
1041 "- sending probe request\n", sdata->dev->name,
1042 sdata->u.mgd.bssid);
1043 }
1044 #endif
1045
1046 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1047 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1048 ifmgd->ssid_len, NULL, 0);
1049
1050 mod_timer(&ifmgd->timer, jiffies + IEEE80211_MONITORING_INTERVAL);
1051 }
1052
1053 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1054 {
1055 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1056
1057 queue_work(sdata->local->hw.workqueue,
1058 &sdata->u.mgd.beacon_loss_work);
1059 }
1060 EXPORT_SYMBOL(ieee80211_beacon_loss);
1061
1062 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
1063 {
1064 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1065 struct ieee80211_local *local = sdata->local;
1066 struct sta_info *sta;
1067 bool disassoc = false;
1068
1069 /* TODO: start monitoring current AP signal quality and number of
1070 * missed beacons. Scan other channels every now and then and search
1071 * for better APs. */
1072 /* TODO: remove expired BSSes */
1073
1074 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
1075
1076 rcu_read_lock();
1077
1078 sta = sta_info_get(local, ifmgd->bssid);
1079 if (!sta) {
1080 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1081 sdata->dev->name, ifmgd->bssid);
1082 disassoc = true;
1083 goto unlock;
1084 }
1085
1086 if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
1087 time_after(jiffies, sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1088 printk(KERN_DEBUG "%s: no probe response from AP %pM "
1089 "- disassociating\n",
1090 sdata->dev->name, ifmgd->bssid);
1091 disassoc = true;
1092 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1093 goto unlock;
1094 }
1095
1096 /*
1097 * Beacon filtering is only enabled with power save and then the
1098 * stack should not check for beacon loss.
1099 */
1100 if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
1101 (local->hw.conf.flags & IEEE80211_CONF_PS)) &&
1102 time_after(jiffies,
1103 ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
1104 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1105 if (net_ratelimit()) {
1106 printk(KERN_DEBUG "%s: beacon loss from AP %pM "
1107 "- sending probe request\n",
1108 sdata->dev->name, ifmgd->bssid);
1109 }
1110 #endif
1111 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1112 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1113 ifmgd->ssid_len, NULL, 0);
1114 goto unlock;
1115
1116 }
1117
1118 if (time_after(jiffies, sta->last_rx + IEEE80211_PROBE_IDLE_TIME)) {
1119 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1120 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1121 ifmgd->ssid_len, NULL, 0);
1122 }
1123
1124 unlock:
1125 rcu_read_unlock();
1126
1127 if (disassoc)
1128 ieee80211_set_disassoc(sdata, true, true,
1129 WLAN_REASON_PREV_AUTH_NOT_VALID);
1130 else
1131 mod_timer(&ifmgd->timer, jiffies +
1132 IEEE80211_MONITORING_INTERVAL);
1133 }
1134
1135
1136 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1137 {
1138 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1139
1140 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1141 ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1142 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1143 /* Wait for SME to request association */
1144 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1145 } else
1146 ieee80211_associate(sdata);
1147 }
1148
1149
1150 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1151 struct ieee80211_mgmt *mgmt,
1152 size_t len)
1153 {
1154 u8 *pos;
1155 struct ieee802_11_elems elems;
1156
1157 pos = mgmt->u.auth.variable;
1158 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1159 if (!elems.challenge)
1160 return;
1161 ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1162 elems.challenge - 2, elems.challenge_len + 2,
1163 sdata->u.mgd.bssid, 1);
1164 sdata->u.mgd.auth_transaction = 4;
1165 }
1166
1167 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1168 struct ieee80211_mgmt *mgmt,
1169 size_t len)
1170 {
1171 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1172 u16 auth_alg, auth_transaction, status_code;
1173
1174 if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1175 return;
1176
1177 if (len < 24 + 6)
1178 return;
1179
1180 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1181 return;
1182
1183 if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1184 return;
1185
1186 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1187 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1188 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1189
1190 if (auth_alg != ifmgd->auth_alg ||
1191 auth_transaction != ifmgd->auth_transaction)
1192 return;
1193
1194 if (status_code != WLAN_STATUS_SUCCESS) {
1195 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1196 u8 algs[3];
1197 const int num_algs = ARRAY_SIZE(algs);
1198 int i, pos;
1199 algs[0] = algs[1] = algs[2] = 0xff;
1200 if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1201 algs[0] = WLAN_AUTH_OPEN;
1202 if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1203 algs[1] = WLAN_AUTH_SHARED_KEY;
1204 if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1205 algs[2] = WLAN_AUTH_LEAP;
1206 if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1207 pos = 0;
1208 else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1209 pos = 1;
1210 else
1211 pos = 2;
1212 for (i = 0; i < num_algs; i++) {
1213 pos++;
1214 if (pos >= num_algs)
1215 pos = 0;
1216 if (algs[pos] == ifmgd->auth_alg ||
1217 algs[pos] == 0xff)
1218 continue;
1219 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1220 !ieee80211_sta_wep_configured(sdata))
1221 continue;
1222 ifmgd->auth_alg = algs[pos];
1223 break;
1224 }
1225 }
1226 return;
1227 }
1228
1229 switch (ifmgd->auth_alg) {
1230 case WLAN_AUTH_OPEN:
1231 case WLAN_AUTH_LEAP:
1232 case WLAN_AUTH_FT:
1233 ieee80211_auth_completed(sdata);
1234 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1235 break;
1236 case WLAN_AUTH_SHARED_KEY:
1237 if (ifmgd->auth_transaction == 4) {
1238 ieee80211_auth_completed(sdata);
1239 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1240 } else
1241 ieee80211_auth_challenge(sdata, mgmt, len);
1242 break;
1243 }
1244 }
1245
1246
1247 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1248 struct ieee80211_mgmt *mgmt,
1249 size_t len)
1250 {
1251 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1252 u16 reason_code;
1253
1254 if (len < 24 + 2)
1255 return;
1256
1257 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1258 return;
1259
1260 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1261
1262 if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1263 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1264 sdata->dev->name, reason_code);
1265
1266 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1267 (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1268 ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1269 ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1270 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1271 mod_timer(&ifmgd->timer, jiffies +
1272 IEEE80211_RETRY_AUTH_INTERVAL);
1273 }
1274
1275 ieee80211_set_disassoc(sdata, true, false, 0);
1276 ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1277 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len);
1278 }
1279
1280
1281 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1282 struct ieee80211_mgmt *mgmt,
1283 size_t len)
1284 {
1285 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1286 u16 reason_code;
1287
1288 if (len < 24 + 2)
1289 return;
1290
1291 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1292 return;
1293
1294 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1295
1296 if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1297 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1298 sdata->dev->name, reason_code);
1299
1300 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1301 ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1302 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1303 mod_timer(&ifmgd->timer, jiffies +
1304 IEEE80211_RETRY_AUTH_INTERVAL);
1305 }
1306
1307 ieee80211_set_disassoc(sdata, false, false, reason_code);
1308 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len);
1309 }
1310
1311
1312 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1313 struct ieee80211_mgmt *mgmt,
1314 size_t len,
1315 int reassoc)
1316 {
1317 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1318 struct ieee80211_local *local = sdata->local;
1319 struct ieee80211_supported_band *sband;
1320 struct sta_info *sta;
1321 u32 rates, basic_rates;
1322 u16 capab_info, status_code, aid;
1323 struct ieee802_11_elems elems;
1324 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1325 u8 *pos;
1326 u32 changed = 0;
1327 int i, j;
1328 bool have_higher_than_11mbit = false, newsta = false;
1329 u16 ap_ht_cap_flags;
1330
1331 /* AssocResp and ReassocResp have identical structure, so process both
1332 * of them in this function. */
1333
1334 if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1335 return;
1336
1337 if (len < 24 + 6)
1338 return;
1339
1340 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1341 return;
1342
1343 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1344 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1345 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1346
1347 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1348 "status=%d aid=%d)\n",
1349 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1350 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1351
1352 pos = mgmt->u.assoc_resp.variable;
1353 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1354
1355 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1356 elems.timeout_int && elems.timeout_int_len == 5 &&
1357 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1358 u32 tu, ms;
1359 tu = get_unaligned_le32(elems.timeout_int + 1);
1360 ms = tu * 1024 / 1000;
1361 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1362 "comeback duration %u TU (%u ms)\n",
1363 sdata->dev->name, tu, ms);
1364 if (ms > IEEE80211_ASSOC_TIMEOUT)
1365 mod_timer(&ifmgd->timer,
1366 jiffies + msecs_to_jiffies(ms));
1367 return;
1368 }
1369
1370 if (status_code != WLAN_STATUS_SUCCESS) {
1371 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1372 sdata->dev->name, status_code);
1373 /* if this was a reassociation, ensure we try a "full"
1374 * association next time. This works around some broken APs
1375 * which do not correctly reject reassociation requests. */
1376 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1377 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1378 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1379 /* Wait for SME to decide what to do next */
1380 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1381 }
1382 return;
1383 }
1384
1385 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1386 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1387 "set\n", sdata->dev->name, aid);
1388 aid &= ~(BIT(15) | BIT(14));
1389
1390 if (!elems.supp_rates) {
1391 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1392 sdata->dev->name);
1393 return;
1394 }
1395
1396 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1397 ifmgd->aid = aid;
1398 ifmgd->ap_capab = capab_info;
1399
1400 kfree(ifmgd->assocresp_ies);
1401 ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1402 ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1403 if (ifmgd->assocresp_ies)
1404 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1405
1406 rcu_read_lock();
1407
1408 /* Add STA entry for the AP */
1409 sta = sta_info_get(local, ifmgd->bssid);
1410 if (!sta) {
1411 newsta = true;
1412
1413 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1414 if (!sta) {
1415 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1416 " the AP\n", sdata->dev->name);
1417 rcu_read_unlock();
1418 return;
1419 }
1420
1421 /* update new sta with its last rx activity */
1422 sta->last_rx = jiffies;
1423 }
1424
1425 /*
1426 * FIXME: Do we really need to update the sta_info's information here?
1427 * We already know about the AP (we found it in our list) so it
1428 * should already be filled with the right info, no?
1429 * As is stands, all this is racy because typically we assume
1430 * the information that is filled in here (except flags) doesn't
1431 * change while a STA structure is alive. As such, it should move
1432 * to between the sta_info_alloc() and sta_info_insert() above.
1433 */
1434
1435 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1436 WLAN_STA_AUTHORIZED);
1437
1438 rates = 0;
1439 basic_rates = 0;
1440 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1441
1442 for (i = 0; i < elems.supp_rates_len; i++) {
1443 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1444 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1445
1446 if (rate > 110)
1447 have_higher_than_11mbit = true;
1448
1449 for (j = 0; j < sband->n_bitrates; j++) {
1450 if (sband->bitrates[j].bitrate == rate) {
1451 rates |= BIT(j);
1452 if (is_basic)
1453 basic_rates |= BIT(j);
1454 break;
1455 }
1456 }
1457 }
1458
1459 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1460 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1461 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1462
1463 if (rate > 110)
1464 have_higher_than_11mbit = true;
1465
1466 for (j = 0; j < sband->n_bitrates; j++) {
1467 if (sband->bitrates[j].bitrate == rate) {
1468 rates |= BIT(j);
1469 if (is_basic)
1470 basic_rates |= BIT(j);
1471 break;
1472 }
1473 }
1474 }
1475
1476 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1477 sdata->vif.bss_conf.basic_rates = basic_rates;
1478
1479 /* cf. IEEE 802.11 9.2.12 */
1480 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1481 have_higher_than_11mbit)
1482 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1483 else
1484 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1485
1486 /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1487 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1488 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1489 elems.ht_cap_elem, &sta->sta.ht_cap);
1490
1491 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1492
1493 rate_control_rate_init(sta);
1494
1495 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1496 set_sta_flags(sta, WLAN_STA_MFP);
1497
1498 if (elems.wmm_param)
1499 set_sta_flags(sta, WLAN_STA_WME);
1500
1501 if (newsta) {
1502 int err = sta_info_insert(sta);
1503 if (err) {
1504 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1505 " the AP (error %d)\n", sdata->dev->name, err);
1506 rcu_read_unlock();
1507 return;
1508 }
1509 }
1510
1511 rcu_read_unlock();
1512
1513 if (elems.wmm_param)
1514 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1515 elems.wmm_param_len);
1516
1517 if (elems.ht_info_elem && elems.wmm_param &&
1518 (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1519 !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1520 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1521 ap_ht_cap_flags);
1522
1523 /* set AID and assoc capability,
1524 * ieee80211_set_associated() will tell the driver */
1525 bss_conf->aid = aid;
1526 bss_conf->assoc_capability = capab_info;
1527 ieee80211_set_associated(sdata, changed);
1528
1529 /*
1530 * initialise the time of last beacon to be the association time,
1531 * otherwise beacon loss check will trigger immediately
1532 */
1533 ifmgd->last_beacon = jiffies;
1534
1535 ieee80211_associated(sdata);
1536 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1537 }
1538
1539
1540 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1541 struct ieee80211_mgmt *mgmt,
1542 size_t len,
1543 struct ieee80211_rx_status *rx_status,
1544 struct ieee802_11_elems *elems,
1545 bool beacon)
1546 {
1547 struct ieee80211_local *local = sdata->local;
1548 int freq;
1549 struct ieee80211_bss *bss;
1550 struct ieee80211_channel *channel;
1551
1552 if (elems->ds_params && elems->ds_params_len == 1)
1553 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1554 else
1555 freq = rx_status->freq;
1556
1557 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1558
1559 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1560 return;
1561
1562 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1563 channel, beacon);
1564 if (!bss)
1565 return;
1566
1567 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1568 (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1569 struct ieee80211_channel_sw_ie *sw_elem =
1570 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1571 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1572 }
1573
1574 ieee80211_rx_bss_put(local, bss);
1575 }
1576
1577
1578 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1579 struct ieee80211_mgmt *mgmt,
1580 size_t len,
1581 struct ieee80211_rx_status *rx_status)
1582 {
1583 struct ieee80211_if_managed *ifmgd;
1584 size_t baselen;
1585 struct ieee802_11_elems elems;
1586
1587 ifmgd = &sdata->u.mgd;
1588
1589 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1590 return; /* ignore ProbeResp to foreign address */
1591
1592 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1593 if (baselen > len)
1594 return;
1595
1596 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1597 &elems);
1598
1599 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1600
1601 /* direct probe may be part of the association flow */
1602 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1603 &ifmgd->request)) {
1604 printk(KERN_DEBUG "%s direct probe responded\n",
1605 sdata->dev->name);
1606 ieee80211_authenticate(sdata);
1607 }
1608
1609 if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1610 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1611 }
1612
1613 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1614 struct ieee80211_mgmt *mgmt,
1615 size_t len,
1616 struct ieee80211_rx_status *rx_status)
1617 {
1618 struct ieee80211_if_managed *ifmgd;
1619 size_t baselen;
1620 struct ieee802_11_elems elems;
1621 struct ieee80211_local *local = sdata->local;
1622 u32 changed = 0;
1623 bool erp_valid, directed_tim;
1624 u8 erp_value = 0;
1625
1626 /* Process beacon from the current BSS */
1627 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1628 if (baselen > len)
1629 return;
1630
1631 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1632
1633 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1634
1635 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1636 return;
1637
1638 ifmgd = &sdata->u.mgd;
1639
1640 if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1641 memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1642 return;
1643
1644 if (rx_status->freq != local->hw.conf.channel->center_freq)
1645 return;
1646
1647 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1648 elems.wmm_param_len);
1649
1650 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1651 directed_tim = ieee80211_check_tim(&elems, ifmgd->aid);
1652
1653 if (directed_tim) {
1654 if (local->hw.conf.dynamic_ps_timeout > 0) {
1655 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1656 ieee80211_hw_config(local,
1657 IEEE80211_CONF_CHANGE_PS);
1658 ieee80211_send_nullfunc(local, sdata, 0);
1659 } else {
1660 local->pspolling = true;
1661
1662 /*
1663 * Here is assumed that the driver will be
1664 * able to send ps-poll frame and receive a
1665 * response even though power save mode is
1666 * enabled, but some drivers might require
1667 * to disable power save here. This needs
1668 * to be investigated.
1669 */
1670 ieee80211_send_pspoll(local, sdata);
1671 }
1672 }
1673 }
1674
1675 if (elems.erp_info && elems.erp_info_len >= 1) {
1676 erp_valid = true;
1677 erp_value = elems.erp_info[0];
1678 } else {
1679 erp_valid = false;
1680 }
1681 changed |= ieee80211_handle_bss_capability(sdata,
1682 le16_to_cpu(mgmt->u.beacon.capab_info),
1683 erp_valid, erp_value);
1684
1685
1686 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1687 !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1688 struct sta_info *sta;
1689 struct ieee80211_supported_band *sband;
1690 u16 ap_ht_cap_flags;
1691
1692 rcu_read_lock();
1693
1694 sta = sta_info_get(local, ifmgd->bssid);
1695 if (!sta) {
1696 rcu_read_unlock();
1697 return;
1698 }
1699
1700 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1701
1702 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1703 elems.ht_cap_elem, &sta->sta.ht_cap);
1704
1705 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1706
1707 rcu_read_unlock();
1708
1709 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1710 ap_ht_cap_flags);
1711 }
1712
1713 if (elems.country_elem) {
1714 /* Note we are only reviewing this on beacons
1715 * for the BSSID we are associated to */
1716 regulatory_hint_11d(local->hw.wiphy,
1717 elems.country_elem, elems.country_elem_len);
1718
1719 /* TODO: IBSS also needs this */
1720 if (elems.pwr_constr_elem)
1721 ieee80211_handle_pwr_constr(sdata,
1722 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1723 elems.pwr_constr_elem,
1724 elems.pwr_constr_elem_len);
1725 }
1726
1727 ieee80211_bss_info_change_notify(sdata, changed);
1728 }
1729
1730 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1731 struct sk_buff *skb,
1732 struct ieee80211_rx_status *rx_status)
1733 {
1734 struct ieee80211_local *local = sdata->local;
1735 struct ieee80211_mgmt *mgmt;
1736 u16 fc;
1737
1738 if (skb->len < 24)
1739 return RX_DROP_MONITOR;
1740
1741 mgmt = (struct ieee80211_mgmt *) skb->data;
1742 fc = le16_to_cpu(mgmt->frame_control);
1743
1744 switch (fc & IEEE80211_FCTL_STYPE) {
1745 case IEEE80211_STYPE_PROBE_REQ:
1746 case IEEE80211_STYPE_PROBE_RESP:
1747 case IEEE80211_STYPE_BEACON:
1748 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1749 case IEEE80211_STYPE_AUTH:
1750 case IEEE80211_STYPE_ASSOC_RESP:
1751 case IEEE80211_STYPE_REASSOC_RESP:
1752 case IEEE80211_STYPE_DEAUTH:
1753 case IEEE80211_STYPE_DISASSOC:
1754 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1755 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1756 return RX_QUEUED;
1757 }
1758
1759 return RX_DROP_MONITOR;
1760 }
1761
1762 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1763 struct sk_buff *skb)
1764 {
1765 struct ieee80211_rx_status *rx_status;
1766 struct ieee80211_mgmt *mgmt;
1767 u16 fc;
1768
1769 rx_status = (struct ieee80211_rx_status *) skb->cb;
1770 mgmt = (struct ieee80211_mgmt *) skb->data;
1771 fc = le16_to_cpu(mgmt->frame_control);
1772
1773 switch (fc & IEEE80211_FCTL_STYPE) {
1774 case IEEE80211_STYPE_PROBE_RESP:
1775 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1776 rx_status);
1777 break;
1778 case IEEE80211_STYPE_BEACON:
1779 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1780 rx_status);
1781 break;
1782 case IEEE80211_STYPE_AUTH:
1783 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1784 break;
1785 case IEEE80211_STYPE_ASSOC_RESP:
1786 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1787 break;
1788 case IEEE80211_STYPE_REASSOC_RESP:
1789 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1790 break;
1791 case IEEE80211_STYPE_DEAUTH:
1792 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1793 break;
1794 case IEEE80211_STYPE_DISASSOC:
1795 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1796 break;
1797 }
1798
1799 kfree_skb(skb);
1800 }
1801
1802 static void ieee80211_sta_timer(unsigned long data)
1803 {
1804 struct ieee80211_sub_if_data *sdata =
1805 (struct ieee80211_sub_if_data *) data;
1806 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1807 struct ieee80211_local *local = sdata->local;
1808
1809 set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1810 queue_work(local->hw.workqueue, &ifmgd->work);
1811 }
1812
1813 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1814 {
1815 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1816 struct ieee80211_local *local = sdata->local;
1817
1818 if (local->ops->reset_tsf) {
1819 /* Reset own TSF to allow time synchronization work. */
1820 local->ops->reset_tsf(local_to_hw(local));
1821 }
1822
1823 ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1824
1825
1826 if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1827 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1828 else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1829 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
1830 else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1831 ifmgd->auth_alg = WLAN_AUTH_LEAP;
1832 else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
1833 ifmgd->auth_alg = WLAN_AUTH_FT;
1834 else
1835 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1836 ifmgd->auth_transaction = -1;
1837 ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1838 ifmgd->assoc_scan_tries = 0;
1839 ifmgd->direct_probe_tries = 0;
1840 ifmgd->auth_tries = 0;
1841 ifmgd->assoc_tries = 0;
1842 netif_tx_stop_all_queues(sdata->dev);
1843 netif_carrier_off(sdata->dev);
1844 }
1845
1846 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
1847 {
1848 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1849 struct ieee80211_local *local = sdata->local;
1850 struct ieee80211_bss *bss;
1851 u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
1852 u8 ssid_len = ifmgd->ssid_len;
1853 u16 capa_mask = WLAN_CAPABILITY_ESS;
1854 u16 capa_val = WLAN_CAPABILITY_ESS;
1855 struct ieee80211_channel *chan = local->oper_channel;
1856
1857 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1858 ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
1859 IEEE80211_STA_AUTO_BSSID_SEL |
1860 IEEE80211_STA_AUTO_CHANNEL_SEL)) {
1861 capa_mask |= WLAN_CAPABILITY_PRIVACY;
1862 if (sdata->default_key)
1863 capa_val |= WLAN_CAPABILITY_PRIVACY;
1864 }
1865
1866 if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
1867 chan = NULL;
1868
1869 if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1870 bssid = NULL;
1871
1872 if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
1873 ssid = NULL;
1874 ssid_len = 0;
1875 }
1876
1877 bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
1878 bssid, ssid, ssid_len,
1879 capa_mask, capa_val);
1880
1881 if (bss) {
1882 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
1883 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
1884 ieee80211_sta_set_ssid(sdata, bss->ssid,
1885 bss->ssid_len);
1886 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
1887 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
1888 bss->supp_rates);
1889 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
1890 sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
1891 else
1892 sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
1893
1894 /* Send out direct probe if no probe resp was received or
1895 * the one we have is outdated
1896 */
1897 if (!bss->last_probe_resp ||
1898 time_after(jiffies, bss->last_probe_resp
1899 + IEEE80211_SCAN_RESULT_EXPIRE))
1900 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1901 else
1902 ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1903
1904 ieee80211_rx_bss_put(local, bss);
1905 ieee80211_sta_reset_auth(sdata);
1906 return 0;
1907 } else {
1908 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
1909 ifmgd->assoc_scan_tries++;
1910 /* XXX maybe racy? */
1911 if (local->scan_req)
1912 return -1;
1913 memcpy(local->int_scan_req.ssids[0].ssid,
1914 ifmgd->ssid, IEEE80211_MAX_SSID_LEN);
1915 if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL)
1916 local->int_scan_req.ssids[0].ssid_len = 0;
1917 else
1918 local->int_scan_req.ssids[0].ssid_len = ifmgd->ssid_len;
1919
1920 if (ieee80211_start_scan(sdata, &local->int_scan_req))
1921 ieee80211_scan_failed(local);
1922
1923 ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1924 set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1925 } else {
1926 ifmgd->assoc_scan_tries = 0;
1927 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1928 }
1929 }
1930 return -1;
1931 }
1932
1933
1934 static void ieee80211_sta_work(struct work_struct *work)
1935 {
1936 struct ieee80211_sub_if_data *sdata =
1937 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1938 struct ieee80211_local *local = sdata->local;
1939 struct ieee80211_if_managed *ifmgd;
1940 struct sk_buff *skb;
1941
1942 if (!netif_running(sdata->dev))
1943 return;
1944
1945 if (local->sw_scanning || local->hw_scanning)
1946 return;
1947
1948 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1949 return;
1950 ifmgd = &sdata->u.mgd;
1951
1952 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1953 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1954
1955 if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
1956 ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1957 ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
1958 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
1959 /*
1960 * The call to ieee80211_start_scan can fail but ieee80211_request_scan
1961 * (which queued ieee80211_sta_work) did not return an error. Thus, call
1962 * ieee80211_scan_failed here if ieee80211_start_scan fails in order to
1963 * notify the scan requester.
1964 */
1965 if (ieee80211_start_scan(sdata, local->scan_req))
1966 ieee80211_scan_failed(local);
1967 return;
1968 }
1969
1970 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
1971 if (ieee80211_sta_config_auth(sdata))
1972 return;
1973 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1974 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
1975 return;
1976
1977 switch (ifmgd->state) {
1978 case IEEE80211_STA_MLME_DISABLED:
1979 break;
1980 case IEEE80211_STA_MLME_DIRECT_PROBE:
1981 ieee80211_direct_probe(sdata);
1982 break;
1983 case IEEE80211_STA_MLME_AUTHENTICATE:
1984 ieee80211_authenticate(sdata);
1985 break;
1986 case IEEE80211_STA_MLME_ASSOCIATE:
1987 ieee80211_associate(sdata);
1988 break;
1989 case IEEE80211_STA_MLME_ASSOCIATED:
1990 ieee80211_associated(sdata);
1991 break;
1992 default:
1993 WARN_ON(1);
1994 break;
1995 }
1996
1997 if (ieee80211_privacy_mismatch(sdata)) {
1998 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
1999 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2000
2001 ieee80211_set_disassoc(sdata, false, true,
2002 WLAN_REASON_UNSPECIFIED);
2003 }
2004 }
2005
2006 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2007 {
2008 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2009 /*
2010 * Need to update last_beacon to avoid beacon loss
2011 * test to trigger.
2012 */
2013 sdata->u.mgd.last_beacon = jiffies;
2014
2015
2016 queue_work(sdata->local->hw.workqueue,
2017 &sdata->u.mgd.work);
2018 }
2019 }
2020
2021 /* interface setup */
2022 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2023 {
2024 struct ieee80211_if_managed *ifmgd;
2025
2026 ifmgd = &sdata->u.mgd;
2027 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2028 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2029 INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2030 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2031 (unsigned long) sdata);
2032 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2033 (unsigned long) sdata);
2034 skb_queue_head_init(&ifmgd->skb_queue);
2035
2036 ifmgd->capab = WLAN_CAPABILITY_ESS;
2037 ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2038 IEEE80211_AUTH_ALG_SHARED_KEY;
2039 ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
2040 IEEE80211_STA_AUTO_BSSID_SEL |
2041 IEEE80211_STA_AUTO_CHANNEL_SEL;
2042 if (sdata->local->hw.queues >= 4)
2043 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2044 }
2045
2046 /* configuration hooks */
2047 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
2048 {
2049 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2050 struct ieee80211_local *local = sdata->local;
2051
2052 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2053 return;
2054
2055 if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
2056 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2057 (ifmgd->flags & (IEEE80211_STA_SSID_SET |
2058 IEEE80211_STA_AUTO_SSID_SEL))) {
2059
2060 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2061 ieee80211_set_disassoc(sdata, true, true,
2062 WLAN_REASON_DEAUTH_LEAVING);
2063
2064 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
2065 ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
2066 set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2067 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
2068 set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2069 queue_work(local->hw.workqueue, &ifmgd->work);
2070 }
2071 }
2072
2073 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
2074 {
2075 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2076
2077 if (ifmgd->ssid_len)
2078 ifmgd->flags |= IEEE80211_STA_SSID_SET;
2079 else
2080 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
2081
2082 return 0;
2083 }
2084
2085 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2086 {
2087 struct ieee80211_if_managed *ifmgd;
2088
2089 if (len > IEEE80211_MAX_SSID_LEN)
2090 return -EINVAL;
2091
2092 ifmgd = &sdata->u.mgd;
2093
2094 if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
2095 /*
2096 * Do not use reassociation if SSID is changed (different ESS).
2097 */
2098 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2099 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
2100 memcpy(ifmgd->ssid, ssid, len);
2101 ifmgd->ssid_len = len;
2102 }
2103
2104 return ieee80211_sta_commit(sdata);
2105 }
2106
2107 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2108 {
2109 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2110 memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
2111 *len = ifmgd->ssid_len;
2112 return 0;
2113 }
2114
2115 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2116 {
2117 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2118
2119 if (is_valid_ether_addr(bssid)) {
2120 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
2121 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
2122 } else {
2123 memset(ifmgd->bssid, 0, ETH_ALEN);
2124 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
2125 }
2126
2127 if (netif_running(sdata->dev)) {
2128 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2129 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2130 "the low-level driver\n", sdata->dev->name);
2131 }
2132 }
2133
2134 return ieee80211_sta_commit(sdata);
2135 }
2136
2137 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2138 const char *ie, size_t len)
2139 {
2140 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2141
2142 kfree(ifmgd->extra_ie);
2143 if (len == 0) {
2144 ifmgd->extra_ie = NULL;
2145 ifmgd->extra_ie_len = 0;
2146 return 0;
2147 }
2148 ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2149 if (!ifmgd->extra_ie) {
2150 ifmgd->extra_ie_len = 0;
2151 return -ENOMEM;
2152 }
2153 memcpy(ifmgd->extra_ie, ie, len);
2154 ifmgd->extra_ie_len = len;
2155 return 0;
2156 }
2157
2158 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2159 {
2160 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2161 sdata->dev->name, reason);
2162
2163 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2164 return -EINVAL;
2165
2166 ieee80211_set_disassoc(sdata, true, true, reason);
2167 return 0;
2168 }
2169
2170 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2171 {
2172 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2173
2174 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2175 sdata->dev->name, reason);
2176
2177 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2178 return -EINVAL;
2179
2180 if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2181 return -ENOLINK;
2182
2183 ieee80211_set_disassoc(sdata, false, true, reason);
2184 return 0;
2185 }
2186
2187 /* scan finished notification */
2188 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2189 {
2190 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2191
2192 /* Restart STA timers */
2193 rcu_read_lock();
2194 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2195 ieee80211_restart_sta_timer(sdata);
2196 rcu_read_unlock();
2197 }
2198
2199 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2200 {
2201 struct ieee80211_local *local =
2202 container_of(work, struct ieee80211_local,
2203 dynamic_ps_disable_work);
2204
2205 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2206 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2207 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2208 }
2209
2210 ieee80211_wake_queues_by_reason(&local->hw,
2211 IEEE80211_QUEUE_STOP_REASON_PS);
2212 }
2213
2214 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2215 {
2216 struct ieee80211_local *local =
2217 container_of(work, struct ieee80211_local,
2218 dynamic_ps_enable_work);
2219 /* XXX: using scan_sdata is completely broken! */
2220 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2221
2222 if (local->hw.conf.flags & IEEE80211_CONF_PS)
2223 return;
2224
2225 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK && sdata)
2226 ieee80211_send_nullfunc(local, sdata, 1);
2227
2228 local->hw.conf.flags |= IEEE80211_CONF_PS;
2229 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2230 }
2231
2232 void ieee80211_dynamic_ps_timer(unsigned long data)
2233 {
2234 struct ieee80211_local *local = (void *) data;
2235
2236 queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2237 }
2238
2239 void ieee80211_send_nullfunc(struct ieee80211_local *local,
2240 struct ieee80211_sub_if_data *sdata,
2241 int powersave)
2242 {
2243 struct sk_buff *skb;
2244 struct ieee80211_hdr *nullfunc;
2245 __le16 fc;
2246
2247 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2248 return;
2249
2250 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
2251 if (!skb) {
2252 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2253 "frame\n", sdata->dev->name);
2254 return;
2255 }
2256 skb_reserve(skb, local->hw.extra_tx_headroom);
2257
2258 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
2259 memset(nullfunc, 0, 24);
2260 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
2261 IEEE80211_FCTL_TODS);
2262 if (powersave)
2263 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
2264 nullfunc->frame_control = fc;
2265 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2266 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
2267 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2268
2269 ieee80211_tx_skb(sdata, skb, 0);
2270 }
Linux kernel - Deliverables
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