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mac80211: reorder mlme code
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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 /* TODO:
15 * order BSS list by RSSI(?) ("quality of AP")
16 * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
17 * SSID)
18 */
19 #include <linux/delay.h>
20 #include <linux/if_ether.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
23 #include <linux/if_arp.h>
24 #include <linux/wireless.h>
25 #include <linux/random.h>
26 #include <linux/etherdevice.h>
27 #include <linux/rtnetlink.h>
28 #include <net/iw_handler.h>
29 #include <net/mac80211.h>
30
31 #include "ieee80211_i.h"
32 #include "rate.h"
33 #include "led.h"
34 #include "mesh.h"
35
36 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
37 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
38 #define IEEE80211_AUTH_MAX_TRIES 3
39 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
40 #define IEEE80211_ASSOC_MAX_TRIES 3
41 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
42 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
43 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
44 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
45 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
46 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
47 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
48
49 #define IEEE80211_PROBE_DELAY (HZ / 33)
50 #define IEEE80211_CHANNEL_TIME (HZ / 33)
51 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
52 #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
53 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
54 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
55 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
56
57 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
58
59
60 /* mgmt header + 1 byte category code */
61 #define IEEE80211_MIN_ACTION_SIZE (24 + 1)
62
63 #define IEEE80211_ADDBA_PARAM_POLICY_MASK 0x0002
64 #define IEEE80211_ADDBA_PARAM_TID_MASK 0x003C
65 #define IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK 0xFFA0
66 #define IEEE80211_DELBA_PARAM_TID_MASK 0xF000
67 #define IEEE80211_DELBA_PARAM_INITIATOR_MASK 0x0800
68
69 /* next values represent the buffer size for A-MPDU frame.
70 * According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2) */
71 #define IEEE80211_MIN_AMPDU_BUF 0x8
72 #define IEEE80211_MAX_AMPDU_BUF 0x40
73
74 /* BSS handling */
75 static struct ieee80211_sta_bss *
76 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
77 u8 *ssid, u8 ssid_len)
78 {
79 struct ieee80211_sta_bss *bss;
80
81 spin_lock_bh(&local->sta_bss_lock);
82 bss = local->sta_bss_hash[STA_HASH(bssid)];
83 while (bss) {
84 if (!bss_mesh_cfg(bss) &&
85 !memcmp(bss->bssid, bssid, ETH_ALEN) &&
86 bss->freq == freq &&
87 bss->ssid_len == ssid_len &&
88 (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
89 atomic_inc(&bss->users);
90 break;
91 }
92 bss = bss->hnext;
93 }
94 spin_unlock_bh(&local->sta_bss_lock);
95 return bss;
96 }
97
98 /* Caller must hold local->sta_bss_lock */
99 static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
100 struct ieee80211_sta_bss *bss)
101 {
102 u8 hash_idx;
103
104 if (bss_mesh_cfg(bss))
105 hash_idx = mesh_id_hash(bss_mesh_id(bss),
106 bss_mesh_id_len(bss));
107 else
108 hash_idx = STA_HASH(bss->bssid);
109
110 bss->hnext = local->sta_bss_hash[hash_idx];
111 local->sta_bss_hash[hash_idx] = bss;
112 }
113
114 /* Caller must hold local->sta_bss_lock */
115 static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
116 struct ieee80211_sta_bss *bss)
117 {
118 struct ieee80211_sta_bss *b, *prev = NULL;
119 b = local->sta_bss_hash[STA_HASH(bss->bssid)];
120 while (b) {
121 if (b == bss) {
122 if (!prev)
123 local->sta_bss_hash[STA_HASH(bss->bssid)] =
124 bss->hnext;
125 else
126 prev->hnext = bss->hnext;
127 break;
128 }
129 prev = b;
130 b = b->hnext;
131 }
132 }
133
134 static struct ieee80211_sta_bss *
135 ieee80211_rx_bss_add(struct ieee80211_sub_if_data *sdata, u8 *bssid, int freq,
136 u8 *ssid, u8 ssid_len)
137 {
138 struct ieee80211_local *local = sdata->local;
139 struct ieee80211_sta_bss *bss;
140
141 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
142 if (!bss)
143 return NULL;
144 atomic_inc(&bss->users);
145 atomic_inc(&bss->users);
146 memcpy(bss->bssid, bssid, ETH_ALEN);
147 bss->freq = freq;
148 if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
149 memcpy(bss->ssid, ssid, ssid_len);
150 bss->ssid_len = ssid_len;
151 }
152
153 spin_lock_bh(&local->sta_bss_lock);
154 /* TODO: order by RSSI? */
155 list_add_tail(&bss->list, &local->sta_bss_list);
156 __ieee80211_rx_bss_hash_add(local, bss);
157 spin_unlock_bh(&local->sta_bss_lock);
158 return bss;
159 }
160
161 #ifdef CONFIG_MAC80211_MESH
162 static struct ieee80211_sta_bss *
163 ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
164 u8 *mesh_cfg, int freq)
165 {
166 struct ieee80211_sta_bss *bss;
167
168 spin_lock_bh(&local->sta_bss_lock);
169 bss = local->sta_bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
170 while (bss) {
171 if (bss_mesh_cfg(bss) &&
172 !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
173 bss->freq == freq &&
174 mesh_id_len == bss->mesh_id_len &&
175 (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
176 mesh_id_len))) {
177 atomic_inc(&bss->users);
178 break;
179 }
180 bss = bss->hnext;
181 }
182 spin_unlock_bh(&local->sta_bss_lock);
183 return bss;
184 }
185
186 static struct ieee80211_sta_bss *
187 ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
188 u8 *mesh_cfg, int mesh_config_len, int freq)
189 {
190 struct ieee80211_sta_bss *bss;
191
192 if (mesh_config_len != MESH_CFG_LEN)
193 return NULL;
194
195 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
196 if (!bss)
197 return NULL;
198
199 bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
200 if (!bss->mesh_cfg) {
201 kfree(bss);
202 return NULL;
203 }
204
205 if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
206 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
207 if (!bss->mesh_id) {
208 kfree(bss->mesh_cfg);
209 kfree(bss);
210 return NULL;
211 }
212 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
213 }
214
215 atomic_inc(&bss->users);
216 atomic_inc(&bss->users);
217 memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
218 bss->mesh_id_len = mesh_id_len;
219 bss->freq = freq;
220 spin_lock_bh(&local->sta_bss_lock);
221 /* TODO: order by RSSI? */
222 list_add_tail(&bss->list, &local->sta_bss_list);
223 __ieee80211_rx_bss_hash_add(local, bss);
224 spin_unlock_bh(&local->sta_bss_lock);
225 return bss;
226 }
227 #endif
228
229 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
230 {
231 kfree(bss->ies);
232 kfree(bss_mesh_id(bss));
233 kfree(bss_mesh_cfg(bss));
234 kfree(bss);
235 }
236
237 static void ieee80211_rx_bss_put(struct ieee80211_local *local,
238 struct ieee80211_sta_bss *bss)
239 {
240 local_bh_disable();
241 if (!atomic_dec_and_lock(&bss->users, &local->sta_bss_lock)) {
242 local_bh_enable();
243 return;
244 }
245
246 __ieee80211_rx_bss_hash_del(local, bss);
247 list_del(&bss->list);
248 spin_unlock_bh(&local->sta_bss_lock);
249 ieee80211_rx_bss_free(bss);
250 }
251
252 void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
253 {
254 spin_lock_init(&local->sta_bss_lock);
255 INIT_LIST_HEAD(&local->sta_bss_list);
256 }
257
258 void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
259 {
260 struct ieee80211_sta_bss *bss, *tmp;
261
262 list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
263 ieee80211_rx_bss_put(local, bss);
264 }
265
266 static u8 *ieee80211_bss_get_ie(struct ieee80211_sta_bss *bss, u8 ie)
267 {
268 u8 *end, *pos;
269
270 pos = bss->ies;
271 if (pos == NULL)
272 return NULL;
273 end = pos + bss->ies_len;
274
275 while (pos + 1 < end) {
276 if (pos + 2 + pos[1] > end)
277 break;
278 if (pos[0] == ie)
279 return pos;
280 pos += 2 + pos[1];
281 }
282
283 return NULL;
284 }
285
286 /* utils */
287 static int ecw2cw(int ecw)
288 {
289 return (1 << ecw) - 1;
290 }
291
292 /* frame sending functions */
293 void ieee80211_sta_tx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
294 int encrypt)
295 {
296 skb->dev = sdata->local->mdev;
297 skb_set_mac_header(skb, 0);
298 skb_set_network_header(skb, 0);
299 skb_set_transport_header(skb, 0);
300
301 skb->iif = sdata->dev->ifindex;
302 skb->do_not_encrypt = !encrypt;
303
304 dev_queue_xmit(skb);
305 }
306
307 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
308 struct ieee80211_if_sta *ifsta,
309 int transaction, u8 *extra, size_t extra_len,
310 int encrypt)
311 {
312 struct ieee80211_local *local = sdata->local;
313 struct sk_buff *skb;
314 struct ieee80211_mgmt *mgmt;
315
316 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
317 sizeof(*mgmt) + 6 + extra_len);
318 if (!skb) {
319 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
320 "frame\n", sdata->dev->name);
321 return;
322 }
323 skb_reserve(skb, local->hw.extra_tx_headroom);
324
325 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
326 memset(mgmt, 0, 24 + 6);
327 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
328 IEEE80211_STYPE_AUTH);
329 if (encrypt)
330 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
331 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
332 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
333 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
334 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
335 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
336 ifsta->auth_transaction = transaction + 1;
337 mgmt->u.auth.status_code = cpu_to_le16(0);
338 if (extra)
339 memcpy(skb_put(skb, extra_len), extra, extra_len);
340
341 ieee80211_sta_tx(sdata, skb, encrypt);
342 }
343
344 static void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
345 u8 *ssid, size_t ssid_len)
346 {
347 struct ieee80211_local *local = sdata->local;
348 struct ieee80211_supported_band *sband;
349 struct sk_buff *skb;
350 struct ieee80211_mgmt *mgmt;
351 u8 *pos, *supp_rates, *esupp_rates = NULL;
352 int i;
353
354 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
355 if (!skb) {
356 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
357 "request\n", sdata->dev->name);
358 return;
359 }
360 skb_reserve(skb, local->hw.extra_tx_headroom);
361
362 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
363 memset(mgmt, 0, 24);
364 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
365 IEEE80211_STYPE_PROBE_REQ);
366 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
367 if (dst) {
368 memcpy(mgmt->da, dst, ETH_ALEN);
369 memcpy(mgmt->bssid, dst, ETH_ALEN);
370 } else {
371 memset(mgmt->da, 0xff, ETH_ALEN);
372 memset(mgmt->bssid, 0xff, ETH_ALEN);
373 }
374 pos = skb_put(skb, 2 + ssid_len);
375 *pos++ = WLAN_EID_SSID;
376 *pos++ = ssid_len;
377 memcpy(pos, ssid, ssid_len);
378
379 supp_rates = skb_put(skb, 2);
380 supp_rates[0] = WLAN_EID_SUPP_RATES;
381 supp_rates[1] = 0;
382 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
383
384 for (i = 0; i < sband->n_bitrates; i++) {
385 struct ieee80211_rate *rate = &sband->bitrates[i];
386 if (esupp_rates) {
387 pos = skb_put(skb, 1);
388 esupp_rates[1]++;
389 } else if (supp_rates[1] == 8) {
390 esupp_rates = skb_put(skb, 3);
391 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
392 esupp_rates[1] = 1;
393 pos = &esupp_rates[2];
394 } else {
395 pos = skb_put(skb, 1);
396 supp_rates[1]++;
397 }
398 *pos = rate->bitrate / 5;
399 }
400
401 ieee80211_sta_tx(sdata, skb, 0);
402 }
403
404 /* MLME */
405 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
406 struct ieee80211_sta_bss *bss,
407 int ibss)
408 {
409 struct ieee80211_local *local = sdata->local;
410 int i, have_higher_than_11mbit = 0;
411
412
413 /* cf. IEEE 802.11 9.2.12 */
414 for (i = 0; i < bss->supp_rates_len; i++)
415 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
416 have_higher_than_11mbit = 1;
417
418 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
419 have_higher_than_11mbit)
420 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
421 else
422 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
423
424
425 if (local->ops->conf_tx) {
426 struct ieee80211_tx_queue_params qparam;
427
428 memset(&qparam, 0, sizeof(qparam));
429
430 qparam.aifs = 2;
431
432 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
433 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
434 qparam.cw_min = 31;
435 else
436 qparam.cw_min = 15;
437
438 qparam.cw_max = 1023;
439 qparam.txop = 0;
440
441 for (i = 0; i < local_to_hw(local)->queues; i++)
442 local->ops->conf_tx(local_to_hw(local), i, &qparam);
443 }
444 }
445
446 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
447 struct ieee80211_if_sta *ifsta,
448 u8 *wmm_param, size_t wmm_param_len)
449 {
450 struct ieee80211_tx_queue_params params;
451 size_t left;
452 int count;
453 u8 *pos;
454
455 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
456 return;
457
458 if (!wmm_param)
459 return;
460
461 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
462 return;
463 count = wmm_param[6] & 0x0f;
464 if (count == ifsta->wmm_last_param_set)
465 return;
466 ifsta->wmm_last_param_set = count;
467
468 pos = wmm_param + 8;
469 left = wmm_param_len - 8;
470
471 memset(&params, 0, sizeof(params));
472
473 if (!local->ops->conf_tx)
474 return;
475
476 local->wmm_acm = 0;
477 for (; left >= 4; left -= 4, pos += 4) {
478 int aci = (pos[0] >> 5) & 0x03;
479 int acm = (pos[0] >> 4) & 0x01;
480 int queue;
481
482 switch (aci) {
483 case 1:
484 queue = 3;
485 if (acm)
486 local->wmm_acm |= BIT(0) | BIT(3);
487 break;
488 case 2:
489 queue = 1;
490 if (acm)
491 local->wmm_acm |= BIT(4) | BIT(5);
492 break;
493 case 3:
494 queue = 0;
495 if (acm)
496 local->wmm_acm |= BIT(6) | BIT(7);
497 break;
498 case 0:
499 default:
500 queue = 2;
501 if (acm)
502 local->wmm_acm |= BIT(1) | BIT(2);
503 break;
504 }
505
506 params.aifs = pos[0] & 0x0f;
507 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
508 params.cw_min = ecw2cw(pos[1] & 0x0f);
509 params.txop = get_unaligned_le16(pos + 2);
510 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
511 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
512 "cWmin=%d cWmax=%d txop=%d\n",
513 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
514 params.cw_max, params.txop);
515 #endif
516 /* TODO: handle ACM (block TX, fallback to next lowest allowed
517 * AC for now) */
518 if (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 u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
526 bool use_protection,
527 bool use_short_preamble)
528 {
529 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
530 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
531 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
532 DECLARE_MAC_BUF(mac);
533 #endif
534 u32 changed = 0;
535
536 if (use_protection != bss_conf->use_cts_prot) {
537 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
538 if (net_ratelimit()) {
539 printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
540 "%s)\n",
541 sdata->dev->name,
542 use_protection ? "enabled" : "disabled",
543 print_mac(mac, ifsta->bssid));
544 }
545 #endif
546 bss_conf->use_cts_prot = use_protection;
547 changed |= BSS_CHANGED_ERP_CTS_PROT;
548 }
549
550 if (use_short_preamble != bss_conf->use_short_preamble) {
551 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
552 if (net_ratelimit()) {
553 printk(KERN_DEBUG "%s: switched to %s barker preamble"
554 " (BSSID=%s)\n",
555 sdata->dev->name,
556 use_short_preamble ? "short" : "long",
557 print_mac(mac, ifsta->bssid));
558 }
559 #endif
560 bss_conf->use_short_preamble = use_short_preamble;
561 changed |= BSS_CHANGED_ERP_PREAMBLE;
562 }
563
564 return changed;
565 }
566
567 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
568 u8 erp_value)
569 {
570 bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
571 bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
572
573 return ieee80211_handle_protect_preamb(sdata,
574 use_protection, use_short_preamble);
575 }
576
577 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
578 struct ieee80211_sta_bss *bss)
579 {
580 u32 changed = 0;
581
582 if (bss->has_erp_value)
583 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
584 else {
585 u16 capab = bss->capability;
586 changed |= ieee80211_handle_protect_preamb(sdata, false,
587 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
588 }
589
590 return changed;
591 }
592
593 int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
594 struct ieee80211_ht_info *ht_info)
595 {
596
597 if (ht_info == NULL)
598 return -EINVAL;
599
600 memset(ht_info, 0, sizeof(*ht_info));
601
602 if (ht_cap_ie) {
603 u8 ampdu_info = ht_cap_ie->ampdu_params_info;
604
605 ht_info->ht_supported = 1;
606 ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
607 ht_info->ampdu_factor =
608 ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
609 ht_info->ampdu_density =
610 (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
611 memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
612 } else
613 ht_info->ht_supported = 0;
614
615 return 0;
616 }
617
618 int ieee80211_ht_addt_info_ie_to_ht_bss_info(
619 struct ieee80211_ht_addt_info *ht_add_info_ie,
620 struct ieee80211_ht_bss_info *bss_info)
621 {
622 if (bss_info == NULL)
623 return -EINVAL;
624
625 memset(bss_info, 0, sizeof(*bss_info));
626
627 if (ht_add_info_ie) {
628 u16 op_mode;
629 op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);
630
631 bss_info->primary_channel = ht_add_info_ie->control_chan;
632 bss_info->bss_cap = ht_add_info_ie->ht_param;
633 bss_info->bss_op_mode = (u8)(op_mode & 0xff);
634 }
635
636 return 0;
637 }
638
639 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
640 struct ieee80211_if_sta *ifsta)
641 {
642 union iwreq_data wrqu;
643 memset(&wrqu, 0, sizeof(wrqu));
644 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
645 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
646 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
647 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
648 }
649
650 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
651 struct ieee80211_if_sta *ifsta)
652 {
653 union iwreq_data wrqu;
654
655 if (ifsta->assocreq_ies) {
656 memset(&wrqu, 0, sizeof(wrqu));
657 wrqu.data.length = ifsta->assocreq_ies_len;
658 wireless_send_event(sdata->dev, IWEVASSOCREQIE, &wrqu,
659 ifsta->assocreq_ies);
660 }
661 if (ifsta->assocresp_ies) {
662 memset(&wrqu, 0, sizeof(wrqu));
663 wrqu.data.length = ifsta->assocresp_ies_len;
664 wireless_send_event(sdata->dev, IWEVASSOCRESPIE, &wrqu,
665 ifsta->assocresp_ies);
666 }
667 }
668
669
670 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
671 struct ieee80211_if_sta *ifsta)
672 {
673 struct ieee80211_local *local = sdata->local;
674 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
675 u32 changed = BSS_CHANGED_ASSOC;
676
677 struct ieee80211_sta_bss *bss;
678
679 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
680
681 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
682 return;
683
684 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
685 conf->channel->center_freq,
686 ifsta->ssid, ifsta->ssid_len);
687 if (bss) {
688 /* set timing information */
689 sdata->bss_conf.beacon_int = bss->beacon_int;
690 sdata->bss_conf.timestamp = bss->timestamp;
691 sdata->bss_conf.dtim_period = bss->dtim_period;
692
693 changed |= ieee80211_handle_bss_capability(sdata, bss);
694
695 ieee80211_rx_bss_put(local, bss);
696 }
697
698 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
699 changed |= BSS_CHANGED_HT;
700 sdata->bss_conf.assoc_ht = 1;
701 sdata->bss_conf.ht_conf = &conf->ht_conf;
702 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
703 }
704
705 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
706 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
707 ieee80211_sta_send_associnfo(sdata, ifsta);
708
709 ifsta->last_probe = jiffies;
710 ieee80211_led_assoc(local, 1);
711
712 sdata->bss_conf.assoc = 1;
713 ieee80211_bss_info_change_notify(sdata, changed);
714
715 netif_tx_start_all_queues(sdata->dev);
716 netif_carrier_on(sdata->dev);
717
718 ieee80211_sta_send_apinfo(sdata, ifsta);
719 }
720
721 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
722 struct ieee80211_if_sta *ifsta)
723 {
724 DECLARE_MAC_BUF(mac);
725
726 ifsta->direct_probe_tries++;
727 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
728 printk(KERN_DEBUG "%s: direct probe to AP %s timed out\n",
729 sdata->dev->name, print_mac(mac, ifsta->bssid));
730 ifsta->state = IEEE80211_STA_MLME_DISABLED;
731 return;
732 }
733
734 printk(KERN_DEBUG "%s: direct probe to AP %s try %d\n",
735 sdata->dev->name, print_mac(mac, ifsta->bssid),
736 ifsta->direct_probe_tries);
737
738 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
739
740 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
741
742 /* Direct probe is sent to broadcast address as some APs
743 * will not answer to direct packet in unassociated state.
744 */
745 ieee80211_send_probe_req(sdata, NULL,
746 ifsta->ssid, ifsta->ssid_len);
747
748 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
749 }
750
751
752 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
753 struct ieee80211_if_sta *ifsta)
754 {
755 DECLARE_MAC_BUF(mac);
756
757 ifsta->auth_tries++;
758 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
759 printk(KERN_DEBUG "%s: authentication with AP %s"
760 " timed out\n",
761 sdata->dev->name, print_mac(mac, ifsta->bssid));
762 ifsta->state = IEEE80211_STA_MLME_DISABLED;
763 return;
764 }
765
766 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
767 printk(KERN_DEBUG "%s: authenticate with AP %s\n",
768 sdata->dev->name, print_mac(mac, ifsta->bssid));
769
770 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
771
772 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
773 }
774
775 static int ieee80211_compatible_rates(struct ieee80211_sta_bss *bss,
776 struct ieee80211_supported_band *sband,
777 u64 *rates)
778 {
779 int i, j, count;
780 *rates = 0;
781 count = 0;
782 for (i = 0; i < bss->supp_rates_len; i++) {
783 int rate = (bss->supp_rates[i] & 0x7F) * 5;
784
785 for (j = 0; j < sband->n_bitrates; j++)
786 if (sband->bitrates[j].bitrate == rate) {
787 *rates |= BIT(j);
788 count++;
789 break;
790 }
791 }
792
793 return count;
794 }
795
796 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
797 struct ieee80211_if_sta *ifsta)
798 {
799 struct ieee80211_local *local = sdata->local;
800 struct sk_buff *skb;
801 struct ieee80211_mgmt *mgmt;
802 u8 *pos, *ies, *ht_add_ie;
803 int i, len, count, rates_len, supp_rates_len;
804 u16 capab;
805 struct ieee80211_sta_bss *bss;
806 int wmm = 0;
807 struct ieee80211_supported_band *sband;
808 u64 rates = 0;
809
810 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
811 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
812 ifsta->ssid_len);
813 if (!skb) {
814 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
815 "frame\n", sdata->dev->name);
816 return;
817 }
818 skb_reserve(skb, local->hw.extra_tx_headroom);
819
820 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
821
822 capab = ifsta->capab;
823
824 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
825 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
826 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
827 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
828 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
829 }
830
831 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
832 local->hw.conf.channel->center_freq,
833 ifsta->ssid, ifsta->ssid_len);
834 if (bss) {
835 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
836 capab |= WLAN_CAPABILITY_PRIVACY;
837 if (bss->wmm_used)
838 wmm = 1;
839
840 /* get all rates supported by the device and the AP as
841 * some APs don't like getting a superset of their rates
842 * in the association request (e.g. D-Link DAP 1353 in
843 * b-only mode) */
844 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
845
846 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
847 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
848 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
849
850 ieee80211_rx_bss_put(local, bss);
851 } else {
852 rates = ~0;
853 rates_len = sband->n_bitrates;
854 }
855
856 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
857 memset(mgmt, 0, 24);
858 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
859 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
860 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
861
862 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
863 skb_put(skb, 10);
864 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
865 IEEE80211_STYPE_REASSOC_REQ);
866 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
867 mgmt->u.reassoc_req.listen_interval =
868 cpu_to_le16(local->hw.conf.listen_interval);
869 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
870 ETH_ALEN);
871 } else {
872 skb_put(skb, 4);
873 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
874 IEEE80211_STYPE_ASSOC_REQ);
875 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
876 mgmt->u.reassoc_req.listen_interval =
877 cpu_to_le16(local->hw.conf.listen_interval);
878 }
879
880 /* SSID */
881 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
882 *pos++ = WLAN_EID_SSID;
883 *pos++ = ifsta->ssid_len;
884 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
885
886 /* add all rates which were marked to be used above */
887 supp_rates_len = rates_len;
888 if (supp_rates_len > 8)
889 supp_rates_len = 8;
890
891 len = sband->n_bitrates;
892 pos = skb_put(skb, supp_rates_len + 2);
893 *pos++ = WLAN_EID_SUPP_RATES;
894 *pos++ = supp_rates_len;
895
896 count = 0;
897 for (i = 0; i < sband->n_bitrates; i++) {
898 if (BIT(i) & rates) {
899 int rate = sband->bitrates[i].bitrate;
900 *pos++ = (u8) (rate / 5);
901 if (++count == 8)
902 break;
903 }
904 }
905
906 if (rates_len > count) {
907 pos = skb_put(skb, rates_len - count + 2);
908 *pos++ = WLAN_EID_EXT_SUPP_RATES;
909 *pos++ = rates_len - count;
910
911 for (i++; i < sband->n_bitrates; i++) {
912 if (BIT(i) & rates) {
913 int rate = sband->bitrates[i].bitrate;
914 *pos++ = (u8) (rate / 5);
915 }
916 }
917 }
918
919 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
920 /* 1. power capabilities */
921 pos = skb_put(skb, 4);
922 *pos++ = WLAN_EID_PWR_CAPABILITY;
923 *pos++ = 2;
924 *pos++ = 0; /* min tx power */
925 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
926
927 /* 2. supported channels */
928 /* TODO: get this in reg domain format */
929 pos = skb_put(skb, 2 * sband->n_channels + 2);
930 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
931 *pos++ = 2 * sband->n_channels;
932 for (i = 0; i < sband->n_channels; i++) {
933 *pos++ = ieee80211_frequency_to_channel(
934 sband->channels[i].center_freq);
935 *pos++ = 1; /* one channel in the subband*/
936 }
937 }
938
939 if (ifsta->extra_ie) {
940 pos = skb_put(skb, ifsta->extra_ie_len);
941 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
942 }
943
944 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
945 pos = skb_put(skb, 9);
946 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
947 *pos++ = 7; /* len */
948 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
949 *pos++ = 0x50;
950 *pos++ = 0xf2;
951 *pos++ = 2; /* WME */
952 *pos++ = 0; /* WME info */
953 *pos++ = 1; /* WME ver */
954 *pos++ = 0;
955 }
956
957 /* wmm support is a must to HT */
958 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
959 sband->ht_info.ht_supported &&
960 (ht_add_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_EXTRA_INFO))) {
961 struct ieee80211_ht_addt_info *ht_add_info =
962 (struct ieee80211_ht_addt_info *)ht_add_ie;
963 u16 cap = sband->ht_info.cap;
964 __le16 tmp;
965 u32 flags = local->hw.conf.channel->flags;
966
967 switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
968 case IEEE80211_HT_IE_CHA_SEC_ABOVE:
969 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
970 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
971 cap &= ~IEEE80211_HT_CAP_SGI_40;
972 }
973 break;
974 case IEEE80211_HT_IE_CHA_SEC_BELOW:
975 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
976 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
977 cap &= ~IEEE80211_HT_CAP_SGI_40;
978 }
979 break;
980 }
981
982 tmp = cpu_to_le16(cap);
983 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
984 *pos++ = WLAN_EID_HT_CAPABILITY;
985 *pos++ = sizeof(struct ieee80211_ht_cap);
986 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
987 memcpy(pos, &tmp, sizeof(u16));
988 pos += sizeof(u16);
989 /* TODO: needs a define here for << 2 */
990 *pos++ = sband->ht_info.ampdu_factor |
991 (sband->ht_info.ampdu_density << 2);
992 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
993 }
994
995 kfree(ifsta->assocreq_ies);
996 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
997 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
998 if (ifsta->assocreq_ies)
999 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
1000
1001 ieee80211_sta_tx(sdata, skb, 0);
1002 }
1003
1004
1005 static void ieee80211_send_deauth(struct ieee80211_sub_if_data *sdata,
1006 struct ieee80211_if_sta *ifsta, u16 reason)
1007 {
1008 struct ieee80211_local *local = sdata->local;
1009 struct sk_buff *skb;
1010 struct ieee80211_mgmt *mgmt;
1011
1012 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
1013 if (!skb) {
1014 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
1015 "frame\n", sdata->dev->name);
1016 return;
1017 }
1018 skb_reserve(skb, local->hw.extra_tx_headroom);
1019
1020 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1021 memset(mgmt, 0, 24);
1022 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
1023 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1024 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1025 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1026 IEEE80211_STYPE_DEAUTH);
1027 skb_put(skb, 2);
1028 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1029
1030 ieee80211_sta_tx(sdata, skb, 0);
1031 }
1032
1033 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1034 {
1035 if (!sdata || !sdata->default_key ||
1036 sdata->default_key->conf.alg != ALG_WEP)
1037 return 0;
1038 return 1;
1039 }
1040
1041 static void ieee80211_send_disassoc(struct ieee80211_sub_if_data *sdata,
1042 struct ieee80211_if_sta *ifsta, u16 reason)
1043 {
1044 struct ieee80211_local *local = sdata->local;
1045 struct sk_buff *skb;
1046 struct ieee80211_mgmt *mgmt;
1047
1048 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
1049 if (!skb) {
1050 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
1051 "frame\n", sdata->dev->name);
1052 return;
1053 }
1054 skb_reserve(skb, local->hw.extra_tx_headroom);
1055
1056 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1057 memset(mgmt, 0, 24);
1058 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
1059 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1060 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1061 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1062 IEEE80211_STYPE_DISASSOC);
1063 skb_put(skb, 2);
1064 mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
1065
1066 ieee80211_sta_tx(sdata, skb, 0);
1067 }
1068
1069 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1070 struct ieee80211_if_sta *ifsta, bool deauth,
1071 bool self_disconnected, u16 reason)
1072 {
1073 struct ieee80211_local *local = sdata->local;
1074 struct sta_info *sta;
1075 u32 changed = BSS_CHANGED_ASSOC;
1076
1077 rcu_read_lock();
1078
1079 sta = sta_info_get(local, ifsta->bssid);
1080 if (!sta) {
1081 rcu_read_unlock();
1082 return;
1083 }
1084
1085 if (deauth) {
1086 ifsta->direct_probe_tries = 0;
1087 ifsta->auth_tries = 0;
1088 }
1089 ifsta->assoc_scan_tries = 0;
1090 ifsta->assoc_tries = 0;
1091
1092 netif_tx_stop_all_queues(sdata->dev);
1093 netif_carrier_off(sdata->dev);
1094
1095 ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);
1096
1097 if (self_disconnected) {
1098 if (deauth)
1099 ieee80211_send_deauth(sdata, ifsta, reason);
1100 else
1101 ieee80211_send_disassoc(sdata, ifsta, reason);
1102 }
1103
1104 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
1105 changed |= ieee80211_reset_erp_info(sdata);
1106
1107 if (sdata->bss_conf.assoc_ht)
1108 changed |= BSS_CHANGED_HT;
1109
1110 sdata->bss_conf.assoc_ht = 0;
1111 sdata->bss_conf.ht_conf = NULL;
1112 sdata->bss_conf.ht_bss_conf = NULL;
1113
1114 ieee80211_led_assoc(local, 0);
1115 sdata->bss_conf.assoc = 0;
1116
1117 ieee80211_sta_send_apinfo(sdata, ifsta);
1118
1119 if (self_disconnected)
1120 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1121
1122 sta_info_unlink(&sta);
1123
1124 rcu_read_unlock();
1125
1126 sta_info_destroy(sta);
1127 }
1128
1129 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
1130 struct ieee80211_if_sta *ifsta)
1131 {
1132 struct ieee80211_local *local = sdata->local;
1133 struct ieee80211_sta_bss *bss;
1134 int bss_privacy;
1135 int wep_privacy;
1136 int privacy_invoked;
1137
1138 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
1139 return 0;
1140
1141 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1142 local->hw.conf.channel->center_freq,
1143 ifsta->ssid, ifsta->ssid_len);
1144 if (!bss)
1145 return 0;
1146
1147 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
1148 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1149 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
1150
1151 ieee80211_rx_bss_put(local, bss);
1152
1153 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1154 return 0;
1155
1156 return 1;
1157 }
1158
1159 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1160 struct ieee80211_if_sta *ifsta)
1161 {
1162 DECLARE_MAC_BUF(mac);
1163
1164 ifsta->assoc_tries++;
1165 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1166 printk(KERN_DEBUG "%s: association with AP %s"
1167 " timed out\n",
1168 sdata->dev->name, print_mac(mac, ifsta->bssid));
1169 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1170 return;
1171 }
1172
1173 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1174 printk(KERN_DEBUG "%s: associate with AP %s\n",
1175 sdata->dev->name, print_mac(mac, ifsta->bssid));
1176 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1177 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1178 "mixed-cell disabled - abort association\n", sdata->dev->name);
1179 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1180 return;
1181 }
1182
1183 ieee80211_send_assoc(sdata, ifsta);
1184
1185 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1186 }
1187
1188
1189 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1190 struct ieee80211_if_sta *ifsta)
1191 {
1192 struct ieee80211_local *local = sdata->local;
1193 struct sta_info *sta;
1194 int disassoc;
1195 DECLARE_MAC_BUF(mac);
1196
1197 /* TODO: start monitoring current AP signal quality and number of
1198 * missed beacons. Scan other channels every now and then and search
1199 * for better APs. */
1200 /* TODO: remove expired BSSes */
1201
1202 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1203
1204 rcu_read_lock();
1205
1206 sta = sta_info_get(local, ifsta->bssid);
1207 if (!sta) {
1208 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
1209 sdata->dev->name, print_mac(mac, ifsta->bssid));
1210 disassoc = 1;
1211 } else {
1212 disassoc = 0;
1213 if (time_after(jiffies,
1214 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1215 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1216 printk(KERN_DEBUG "%s: No ProbeResp from "
1217 "current AP %s - assume out of "
1218 "range\n",
1219 sdata->dev->name, print_mac(mac, ifsta->bssid));
1220 disassoc = 1;
1221 } else
1222 ieee80211_send_probe_req(sdata, ifsta->bssid,
1223 local->scan_ssid,
1224 local->scan_ssid_len);
1225 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1226 } else {
1227 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1228 if (time_after(jiffies, ifsta->last_probe +
1229 IEEE80211_PROBE_INTERVAL)) {
1230 ifsta->last_probe = jiffies;
1231 ieee80211_send_probe_req(sdata, ifsta->bssid,
1232 ifsta->ssid,
1233 ifsta->ssid_len);
1234 }
1235 }
1236 }
1237
1238 rcu_read_unlock();
1239
1240 if (disassoc)
1241 ieee80211_set_disassoc(sdata, ifsta, true, true,
1242 WLAN_REASON_PREV_AUTH_NOT_VALID);
1243 else
1244 mod_timer(&ifsta->timer, jiffies +
1245 IEEE80211_MONITORING_INTERVAL);
1246 }
1247
1248
1249 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1250 struct ieee80211_if_sta *ifsta)
1251 {
1252 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1253 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1254 ieee80211_associate(sdata, ifsta);
1255 }
1256
1257
1258 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1259 struct ieee80211_if_sta *ifsta,
1260 struct ieee80211_mgmt *mgmt,
1261 size_t len)
1262 {
1263 u8 *pos;
1264 struct ieee802_11_elems elems;
1265
1266 pos = mgmt->u.auth.variable;
1267 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1268 if (!elems.challenge)
1269 return;
1270 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1271 elems.challenge_len + 2, 1);
1272 }
1273
1274 static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
1275 u8 dialog_token, u16 status, u16 policy,
1276 u16 buf_size, u16 timeout)
1277 {
1278 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1279 struct ieee80211_local *local = sdata->local;
1280 struct sk_buff *skb;
1281 struct ieee80211_mgmt *mgmt;
1282 u16 capab;
1283
1284 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1285
1286 if (!skb) {
1287 printk(KERN_DEBUG "%s: failed to allocate buffer "
1288 "for addba resp frame\n", sdata->dev->name);
1289 return;
1290 }
1291
1292 skb_reserve(skb, local->hw.extra_tx_headroom);
1293 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1294 memset(mgmt, 0, 24);
1295 memcpy(mgmt->da, da, ETH_ALEN);
1296 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1297 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1298 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1299 else
1300 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1301 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1302 IEEE80211_STYPE_ACTION);
1303
1304 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
1305 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1306 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
1307 mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
1308
1309 capab = (u16)(policy << 1); /* bit 1 aggregation policy */
1310 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1311 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
1312
1313 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
1314 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
1315 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
1316
1317 ieee80211_sta_tx(sdata, skb, 0);
1318
1319 return;
1320 }
1321
1322 void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, const u8 *da,
1323 u16 tid, u8 dialog_token, u16 start_seq_num,
1324 u16 agg_size, u16 timeout)
1325 {
1326 struct ieee80211_local *local = sdata->local;
1327 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1328 struct sk_buff *skb;
1329 struct ieee80211_mgmt *mgmt;
1330 u16 capab;
1331
1332 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1333
1334 if (!skb) {
1335 printk(KERN_ERR "%s: failed to allocate buffer "
1336 "for addba request frame\n", sdata->dev->name);
1337 return;
1338 }
1339 skb_reserve(skb, local->hw.extra_tx_headroom);
1340 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1341 memset(mgmt, 0, 24);
1342 memcpy(mgmt->da, da, ETH_ALEN);
1343 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1344 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1345 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1346 else
1347 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1348
1349 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1350 IEEE80211_STYPE_ACTION);
1351
1352 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
1353
1354 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1355 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
1356
1357 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
1358 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
1359 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1360 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
1361
1362 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
1363
1364 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
1365 mgmt->u.action.u.addba_req.start_seq_num =
1366 cpu_to_le16(start_seq_num << 4);
1367
1368 ieee80211_sta_tx(sdata, skb, 0);
1369 }
1370
1371 /*
1372 * After accepting the AddBA Request we activated a timer,
1373 * resetting it after each frame that arrives from the originator.
1374 * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
1375 */
1376 static void sta_rx_agg_session_timer_expired(unsigned long data)
1377 {
1378 /* not an elegant detour, but there is no choice as the timer passes
1379 * only one argument, and various sta_info are needed here, so init
1380 * flow in sta_info_create gives the TID as data, while the timer_to_id
1381 * array gives the sta through container_of */
1382 u8 *ptid = (u8 *)data;
1383 u8 *timer_to_id = ptid - *ptid;
1384 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
1385 timer_to_tid[0]);
1386
1387 #ifdef CONFIG_MAC80211_HT_DEBUG
1388 printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
1389 #endif
1390 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->addr,
1391 (u16)*ptid, WLAN_BACK_TIMER,
1392 WLAN_REASON_QSTA_TIMEOUT);
1393 }
1394
1395 static void ieee80211_sta_process_addba_request(struct ieee80211_local *local,
1396 struct ieee80211_mgmt *mgmt,
1397 size_t len)
1398 {
1399 struct ieee80211_hw *hw = &local->hw;
1400 struct ieee80211_conf *conf = &hw->conf;
1401 struct sta_info *sta;
1402 struct tid_ampdu_rx *tid_agg_rx;
1403 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
1404 u8 dialog_token;
1405 int ret = -EOPNOTSUPP;
1406 DECLARE_MAC_BUF(mac);
1407
1408 rcu_read_lock();
1409
1410 sta = sta_info_get(local, mgmt->sa);
1411 if (!sta) {
1412 rcu_read_unlock();
1413 return;
1414 }
1415
1416 /* extract session parameters from addba request frame */
1417 dialog_token = mgmt->u.action.u.addba_req.dialog_token;
1418 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
1419 start_seq_num =
1420 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
1421
1422 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
1423 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
1424 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1425 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
1426
1427 status = WLAN_STATUS_REQUEST_DECLINED;
1428
1429 /* sanity check for incoming parameters:
1430 * check if configuration can support the BA policy
1431 * and if buffer size does not exceeds max value */
1432 if (((ba_policy != 1)
1433 && (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA)))
1434 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
1435 status = WLAN_STATUS_INVALID_QOS_PARAM;
1436 #ifdef CONFIG_MAC80211_HT_DEBUG
1437 if (net_ratelimit())
1438 printk(KERN_DEBUG "AddBA Req with bad params from "
1439 "%s on tid %u. policy %d, buffer size %d\n",
1440 print_mac(mac, mgmt->sa), tid, ba_policy,
1441 buf_size);
1442 #endif /* CONFIG_MAC80211_HT_DEBUG */
1443 goto end_no_lock;
1444 }
1445 /* determine default buffer size */
1446 if (buf_size == 0) {
1447 struct ieee80211_supported_band *sband;
1448
1449 sband = local->hw.wiphy->bands[conf->channel->band];
1450 buf_size = IEEE80211_MIN_AMPDU_BUF;
1451 buf_size = buf_size << sband->ht_info.ampdu_factor;
1452 }
1453
1454
1455 /* examine state machine */
1456 spin_lock_bh(&sta->lock);
1457
1458 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
1459 #ifdef CONFIG_MAC80211_HT_DEBUG
1460 if (net_ratelimit())
1461 printk(KERN_DEBUG "unexpected AddBA Req from "
1462 "%s on tid %u\n",
1463 print_mac(mac, mgmt->sa), tid);
1464 #endif /* CONFIG_MAC80211_HT_DEBUG */
1465 goto end;
1466 }
1467
1468 /* prepare A-MPDU MLME for Rx aggregation */
1469 sta->ampdu_mlme.tid_rx[tid] =
1470 kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
1471 if (!sta->ampdu_mlme.tid_rx[tid]) {
1472 #ifdef CONFIG_MAC80211_HT_DEBUG
1473 if (net_ratelimit())
1474 printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
1475 tid);
1476 #endif
1477 goto end;
1478 }
1479 /* rx timer */
1480 sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
1481 sta_rx_agg_session_timer_expired;
1482 sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
1483 (unsigned long)&sta->timer_to_tid[tid];
1484 init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1485
1486 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
1487
1488 /* prepare reordering buffer */
1489 tid_agg_rx->reorder_buf =
1490 kmalloc(buf_size * sizeof(struct sk_buff *), GFP_ATOMIC);
1491 if (!tid_agg_rx->reorder_buf) {
1492 #ifdef CONFIG_MAC80211_HT_DEBUG
1493 if (net_ratelimit())
1494 printk(KERN_ERR "can not allocate reordering buffer "
1495 "to tid %d\n", tid);
1496 #endif
1497 kfree(sta->ampdu_mlme.tid_rx[tid]);
1498 goto end;
1499 }
1500 memset(tid_agg_rx->reorder_buf, 0,
1501 buf_size * sizeof(struct sk_buff *));
1502
1503 if (local->ops->ampdu_action)
1504 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
1505 sta->addr, tid, &start_seq_num);
1506 #ifdef CONFIG_MAC80211_HT_DEBUG
1507 printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
1508 #endif /* CONFIG_MAC80211_HT_DEBUG */
1509
1510 if (ret) {
1511 kfree(tid_agg_rx->reorder_buf);
1512 kfree(tid_agg_rx);
1513 sta->ampdu_mlme.tid_rx[tid] = NULL;
1514 goto end;
1515 }
1516
1517 /* change state and send addba resp */
1518 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
1519 tid_agg_rx->dialog_token = dialog_token;
1520 tid_agg_rx->ssn = start_seq_num;
1521 tid_agg_rx->head_seq_num = start_seq_num;
1522 tid_agg_rx->buf_size = buf_size;
1523 tid_agg_rx->timeout = timeout;
1524 tid_agg_rx->stored_mpdu_num = 0;
1525 status = WLAN_STATUS_SUCCESS;
1526 end:
1527 spin_unlock_bh(&sta->lock);
1528
1529 end_no_lock:
1530 ieee80211_send_addba_resp(sta->sdata, sta->addr, tid,
1531 dialog_token, status, 1, buf_size, timeout);
1532 rcu_read_unlock();
1533 }
1534
1535 static void ieee80211_sta_process_addba_resp(struct ieee80211_local *local,
1536 struct ieee80211_mgmt *mgmt,
1537 size_t len)
1538 {
1539 struct ieee80211_hw *hw = &local->hw;
1540 struct sta_info *sta;
1541 u16 capab;
1542 u16 tid;
1543 u8 *state;
1544
1545 rcu_read_lock();
1546
1547 sta = sta_info_get(local, mgmt->sa);
1548 if (!sta) {
1549 rcu_read_unlock();
1550 return;
1551 }
1552
1553 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
1554 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1555
1556 state = &sta->ampdu_mlme.tid_state_tx[tid];
1557
1558 spin_lock_bh(&sta->lock);
1559
1560 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1561 spin_unlock_bh(&sta->lock);
1562 goto addba_resp_exit;
1563 }
1564
1565 if (mgmt->u.action.u.addba_resp.dialog_token !=
1566 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
1567 spin_unlock_bh(&sta->lock);
1568 #ifdef CONFIG_MAC80211_HT_DEBUG
1569 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
1570 #endif /* CONFIG_MAC80211_HT_DEBUG */
1571 goto addba_resp_exit;
1572 }
1573
1574 del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
1575 #ifdef CONFIG_MAC80211_HT_DEBUG
1576 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
1577 #endif /* CONFIG_MAC80211_HT_DEBUG */
1578 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
1579 == WLAN_STATUS_SUCCESS) {
1580 *state |= HT_ADDBA_RECEIVED_MSK;
1581 sta->ampdu_mlme.addba_req_num[tid] = 0;
1582
1583 if (*state == HT_AGG_STATE_OPERATIONAL)
1584 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
1585
1586 spin_unlock_bh(&sta->lock);
1587 } else {
1588 sta->ampdu_mlme.addba_req_num[tid]++;
1589 /* this will allow the state check in stop_BA_session */
1590 *state = HT_AGG_STATE_OPERATIONAL;
1591 spin_unlock_bh(&sta->lock);
1592 ieee80211_stop_tx_ba_session(hw, sta->addr, tid,
1593 WLAN_BACK_INITIATOR);
1594 }
1595
1596 addba_resp_exit:
1597 rcu_read_unlock();
1598 }
1599
1600 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, const u8 *da, u16 tid,
1601 u16 initiator, u16 reason_code)
1602 {
1603 struct ieee80211_local *local = sdata->local;
1604 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1605 struct sk_buff *skb;
1606 struct ieee80211_mgmt *mgmt;
1607 u16 params;
1608
1609 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1610
1611 if (!skb) {
1612 printk(KERN_ERR "%s: failed to allocate buffer "
1613 "for delba frame\n", sdata->dev->name);
1614 return;
1615 }
1616
1617 skb_reserve(skb, local->hw.extra_tx_headroom);
1618 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1619 memset(mgmt, 0, 24);
1620 memcpy(mgmt->da, da, ETH_ALEN);
1621 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1622 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1623 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1624 else
1625 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1626 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1627 IEEE80211_STYPE_ACTION);
1628
1629 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
1630
1631 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1632 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
1633 params = (u16)(initiator << 11); /* bit 11 initiator */
1634 params |= (u16)(tid << 12); /* bit 15:12 TID number */
1635
1636 mgmt->u.action.u.delba.params = cpu_to_le16(params);
1637 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
1638
1639 ieee80211_sta_tx(sdata, skb, 0);
1640 }
1641
1642 void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
1643 {
1644 struct ieee80211_local *local = sdata->local;
1645 struct sk_buff *skb;
1646 struct ieee80211_bar *bar;
1647 u16 bar_control = 0;
1648
1649 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
1650 if (!skb) {
1651 printk(KERN_ERR "%s: failed to allocate buffer for "
1652 "bar frame\n", sdata->dev->name);
1653 return;
1654 }
1655 skb_reserve(skb, local->hw.extra_tx_headroom);
1656 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
1657 memset(bar, 0, sizeof(*bar));
1658 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
1659 IEEE80211_STYPE_BACK_REQ);
1660 memcpy(bar->ra, ra, ETH_ALEN);
1661 memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN);
1662 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
1663 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
1664 bar_control |= (u16)(tid << 12);
1665 bar->control = cpu_to_le16(bar_control);
1666 bar->start_seq_num = cpu_to_le16(ssn);
1667
1668 ieee80211_sta_tx(sdata, skb, 0);
1669 }
1670
1671 void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
1672 u16 initiator, u16 reason)
1673 {
1674 struct ieee80211_local *local = sdata->local;
1675 struct ieee80211_hw *hw = &local->hw;
1676 struct sta_info *sta;
1677 int ret, i;
1678 DECLARE_MAC_BUF(mac);
1679
1680 rcu_read_lock();
1681
1682 sta = sta_info_get(local, ra);
1683 if (!sta) {
1684 rcu_read_unlock();
1685 return;
1686 }
1687
1688 /* check if TID is in operational state */
1689 spin_lock_bh(&sta->lock);
1690 if (sta->ampdu_mlme.tid_state_rx[tid]
1691 != HT_AGG_STATE_OPERATIONAL) {
1692 spin_unlock_bh(&sta->lock);
1693 rcu_read_unlock();
1694 return;
1695 }
1696 sta->ampdu_mlme.tid_state_rx[tid] =
1697 HT_AGG_STATE_REQ_STOP_BA_MSK |
1698 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
1699 spin_unlock_bh(&sta->lock);
1700
1701 /* stop HW Rx aggregation. ampdu_action existence
1702 * already verified in session init so we add the BUG_ON */
1703 BUG_ON(!local->ops->ampdu_action);
1704
1705 #ifdef CONFIG_MAC80211_HT_DEBUG
1706 printk(KERN_DEBUG "Rx BA session stop requested for %s tid %u\n",
1707 print_mac(mac, ra), tid);
1708 #endif /* CONFIG_MAC80211_HT_DEBUG */
1709
1710 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
1711 ra, tid, NULL);
1712 if (ret)
1713 printk(KERN_DEBUG "HW problem - can not stop rx "
1714 "aggregation for tid %d\n", tid);
1715
1716 /* shutdown timer has not expired */
1717 if (initiator != WLAN_BACK_TIMER)
1718 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1719
1720 /* check if this is a self generated aggregation halt */
1721 if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
1722 ieee80211_send_delba(sdata, ra, tid, 0, reason);
1723
1724 /* free the reordering buffer */
1725 for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
1726 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
1727 /* release the reordered frames */
1728 dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
1729 sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
1730 sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
1731 }
1732 }
1733 /* free resources */
1734 kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
1735 kfree(sta->ampdu_mlme.tid_rx[tid]);
1736 sta->ampdu_mlme.tid_rx[tid] = NULL;
1737 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
1738
1739 rcu_read_unlock();
1740 }
1741
1742
1743 static void ieee80211_sta_process_delba(struct ieee80211_sub_if_data *sdata,
1744 struct ieee80211_mgmt *mgmt, size_t len)
1745 {
1746 struct ieee80211_local *local = sdata->local;
1747 struct sta_info *sta;
1748 u16 tid, params;
1749 u16 initiator;
1750 DECLARE_MAC_BUF(mac);
1751
1752 rcu_read_lock();
1753
1754 sta = sta_info_get(local, mgmt->sa);
1755 if (!sta) {
1756 rcu_read_unlock();
1757 return;
1758 }
1759
1760 params = le16_to_cpu(mgmt->u.action.u.delba.params);
1761 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
1762 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
1763
1764 #ifdef CONFIG_MAC80211_HT_DEBUG
1765 if (net_ratelimit())
1766 printk(KERN_DEBUG "delba from %s (%s) tid %d reason code %d\n",
1767 print_mac(mac, mgmt->sa),
1768 initiator ? "initiator" : "recipient", tid,
1769 mgmt->u.action.u.delba.reason_code);
1770 #endif /* CONFIG_MAC80211_HT_DEBUG */
1771
1772 if (initiator == WLAN_BACK_INITIATOR)
1773 ieee80211_sta_stop_rx_ba_session(sdata, sta->addr, tid,
1774 WLAN_BACK_INITIATOR, 0);
1775 else { /* WLAN_BACK_RECIPIENT */
1776 spin_lock_bh(&sta->lock);
1777 sta->ampdu_mlme.tid_state_tx[tid] =
1778 HT_AGG_STATE_OPERATIONAL;
1779 spin_unlock_bh(&sta->lock);
1780 ieee80211_stop_tx_ba_session(&local->hw, sta->addr, tid,
1781 WLAN_BACK_RECIPIENT);
1782 }
1783 rcu_read_unlock();
1784 }
1785
1786 /*
1787 * After sending add Block Ack request we activated a timer until
1788 * add Block Ack response will arrive from the recipient.
1789 * If this timer expires sta_addba_resp_timer_expired will be executed.
1790 */
1791 void sta_addba_resp_timer_expired(unsigned long data)
1792 {
1793 /* not an elegant detour, but there is no choice as the timer passes
1794 * only one argument, and both sta_info and TID are needed, so init
1795 * flow in sta_info_create gives the TID as data, while the timer_to_id
1796 * array gives the sta through container_of */
1797 u16 tid = *(u8 *)data;
1798 struct sta_info *temp_sta = container_of((void *)data,
1799 struct sta_info, timer_to_tid[tid]);
1800
1801 struct ieee80211_local *local = temp_sta->local;
1802 struct ieee80211_hw *hw = &local->hw;
1803 struct sta_info *sta;
1804 u8 *state;
1805
1806 rcu_read_lock();
1807
1808 sta = sta_info_get(local, temp_sta->addr);
1809 if (!sta) {
1810 rcu_read_unlock();
1811 return;
1812 }
1813
1814 state = &sta->ampdu_mlme.tid_state_tx[tid];
1815 /* check if the TID waits for addBA response */
1816 spin_lock_bh(&sta->lock);
1817 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1818 spin_unlock_bh(&sta->lock);
1819 *state = HT_AGG_STATE_IDLE;
1820 #ifdef CONFIG_MAC80211_HT_DEBUG
1821 printk(KERN_DEBUG "timer expired on tid %d but we are not "
1822 "expecting addBA response there", tid);
1823 #endif
1824 goto timer_expired_exit;
1825 }
1826
1827 #ifdef CONFIG_MAC80211_HT_DEBUG
1828 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
1829 #endif
1830
1831 /* go through the state check in stop_BA_session */
1832 *state = HT_AGG_STATE_OPERATIONAL;
1833 spin_unlock_bh(&sta->lock);
1834 ieee80211_stop_tx_ba_session(hw, temp_sta->addr, tid,
1835 WLAN_BACK_INITIATOR);
1836
1837 timer_expired_exit:
1838 rcu_read_unlock();
1839 }
1840
1841 void ieee80211_sta_tear_down_BA_sessions(struct ieee80211_sub_if_data *sdata, u8 *addr)
1842 {
1843 struct ieee80211_local *local = sdata->local;
1844 int i;
1845
1846 for (i = 0; i < STA_TID_NUM; i++) {
1847 ieee80211_stop_tx_ba_session(&local->hw, addr, i,
1848 WLAN_BACK_INITIATOR);
1849 ieee80211_sta_stop_rx_ba_session(sdata, addr, i,
1850 WLAN_BACK_RECIPIENT,
1851 WLAN_REASON_QSTA_LEAVE_QBSS);
1852 }
1853 }
1854
1855 static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
1856 struct ieee80211_msrment_ie *request_ie,
1857 const u8 *da, const u8 *bssid,
1858 u8 dialog_token)
1859 {
1860 struct ieee80211_local *local = sdata->local;
1861 struct sk_buff *skb;
1862 struct ieee80211_mgmt *msr_report;
1863
1864 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
1865 sizeof(struct ieee80211_msrment_ie));
1866
1867 if (!skb) {
1868 printk(KERN_ERR "%s: failed to allocate buffer for "
1869 "measurement report frame\n", sdata->dev->name);
1870 return;
1871 }
1872
1873 skb_reserve(skb, local->hw.extra_tx_headroom);
1874 msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
1875 memset(msr_report, 0, 24);
1876 memcpy(msr_report->da, da, ETH_ALEN);
1877 memcpy(msr_report->sa, sdata->dev->dev_addr, ETH_ALEN);
1878 memcpy(msr_report->bssid, bssid, ETH_ALEN);
1879 msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1880 IEEE80211_STYPE_ACTION);
1881
1882 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
1883 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
1884 msr_report->u.action.u.measurement.action_code =
1885 WLAN_ACTION_SPCT_MSR_RPRT;
1886 msr_report->u.action.u.measurement.dialog_token = dialog_token;
1887
1888 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
1889 msr_report->u.action.u.measurement.length =
1890 sizeof(struct ieee80211_msrment_ie);
1891
1892 memset(&msr_report->u.action.u.measurement.msr_elem, 0,
1893 sizeof(struct ieee80211_msrment_ie));
1894 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
1895 msr_report->u.action.u.measurement.msr_elem.mode |=
1896 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
1897 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
1898
1899 ieee80211_sta_tx(sdata, skb, 0);
1900 }
1901
1902 static void ieee80211_sta_process_measurement_req(struct ieee80211_sub_if_data *sdata,
1903 struct ieee80211_mgmt *mgmt,
1904 size_t len)
1905 {
1906 /*
1907 * Ignoring measurement request is spec violation.
1908 * Mandatory measurements must be reported optional
1909 * measurements might be refused or reported incapable
1910 * For now just refuse
1911 * TODO: Answer basic measurement as unmeasured
1912 */
1913 ieee80211_send_refuse_measurement_request(sdata,
1914 &mgmt->u.action.u.measurement.msr_elem,
1915 mgmt->sa, mgmt->bssid,
1916 mgmt->u.action.u.measurement.dialog_token);
1917 }
1918
1919
1920 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1921 struct ieee80211_if_sta *ifsta,
1922 struct ieee80211_mgmt *mgmt,
1923 size_t len)
1924 {
1925 u16 auth_alg, auth_transaction, status_code;
1926 DECLARE_MAC_BUF(mac);
1927
1928 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1929 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1930 return;
1931
1932 if (len < 24 + 6)
1933 return;
1934
1935 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1936 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1937 return;
1938
1939 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1940 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1941 return;
1942
1943 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1944 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1945 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1946
1947 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1948 /*
1949 * IEEE 802.11 standard does not require authentication in IBSS
1950 * networks and most implementations do not seem to use it.
1951 * However, try to reply to authentication attempts if someone
1952 * has actually implemented this.
1953 */
1954 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1955 return;
1956 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1957 }
1958
1959 if (auth_alg != ifsta->auth_alg ||
1960 auth_transaction != ifsta->auth_transaction)
1961 return;
1962
1963 if (status_code != WLAN_STATUS_SUCCESS) {
1964 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1965 u8 algs[3];
1966 const int num_algs = ARRAY_SIZE(algs);
1967 int i, pos;
1968 algs[0] = algs[1] = algs[2] = 0xff;
1969 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1970 algs[0] = WLAN_AUTH_OPEN;
1971 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1972 algs[1] = WLAN_AUTH_SHARED_KEY;
1973 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1974 algs[2] = WLAN_AUTH_LEAP;
1975 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1976 pos = 0;
1977 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1978 pos = 1;
1979 else
1980 pos = 2;
1981 for (i = 0; i < num_algs; i++) {
1982 pos++;
1983 if (pos >= num_algs)
1984 pos = 0;
1985 if (algs[pos] == ifsta->auth_alg ||
1986 algs[pos] == 0xff)
1987 continue;
1988 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1989 !ieee80211_sta_wep_configured(sdata))
1990 continue;
1991 ifsta->auth_alg = algs[pos];
1992 break;
1993 }
1994 }
1995 return;
1996 }
1997
1998 switch (ifsta->auth_alg) {
1999 case WLAN_AUTH_OPEN:
2000 case WLAN_AUTH_LEAP:
2001 ieee80211_auth_completed(sdata, ifsta);
2002 break;
2003 case WLAN_AUTH_SHARED_KEY:
2004 if (ifsta->auth_transaction == 4)
2005 ieee80211_auth_completed(sdata, ifsta);
2006 else
2007 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
2008 break;
2009 }
2010 }
2011
2012
2013 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2014 struct ieee80211_if_sta *ifsta,
2015 struct ieee80211_mgmt *mgmt,
2016 size_t len)
2017 {
2018 u16 reason_code;
2019 DECLARE_MAC_BUF(mac);
2020
2021 if (len < 24 + 2)
2022 return;
2023
2024 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
2025 return;
2026
2027 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2028
2029 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
2030 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
2031
2032 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
2033 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
2034 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
2035 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2036 mod_timer(&ifsta->timer, jiffies +
2037 IEEE80211_RETRY_AUTH_INTERVAL);
2038 }
2039
2040 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
2041 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
2042 }
2043
2044
2045 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2046 struct ieee80211_if_sta *ifsta,
2047 struct ieee80211_mgmt *mgmt,
2048 size_t len)
2049 {
2050 u16 reason_code;
2051 DECLARE_MAC_BUF(mac);
2052
2053 if (len < 24 + 2)
2054 return;
2055
2056 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
2057 return;
2058
2059 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2060
2061 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
2062 printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name);
2063
2064 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
2065 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
2066 mod_timer(&ifsta->timer, jiffies +
2067 IEEE80211_RETRY_AUTH_INTERVAL);
2068 }
2069
2070 ieee80211_set_disassoc(sdata, ifsta, false, false, 0);
2071 }
2072
2073
2074 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2075 struct ieee80211_if_sta *ifsta,
2076 struct ieee80211_mgmt *mgmt,
2077 size_t len,
2078 int reassoc)
2079 {
2080 struct ieee80211_local *local = sdata->local;
2081 struct ieee80211_supported_band *sband;
2082 struct sta_info *sta;
2083 u64 rates, basic_rates;
2084 u16 capab_info, status_code, aid;
2085 struct ieee802_11_elems elems;
2086 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
2087 u8 *pos;
2088 int i, j;
2089 DECLARE_MAC_BUF(mac);
2090 bool have_higher_than_11mbit = false;
2091
2092 /* AssocResp and ReassocResp have identical structure, so process both
2093 * of them in this function. */
2094
2095 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
2096 return;
2097
2098 if (len < 24 + 6)
2099 return;
2100
2101 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
2102 return;
2103
2104 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2105 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2106 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2107
2108 printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
2109 "status=%d aid=%d)\n",
2110 sdata->dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
2111 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2112
2113 if (status_code != WLAN_STATUS_SUCCESS) {
2114 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
2115 sdata->dev->name, status_code);
2116 /* if this was a reassociation, ensure we try a "full"
2117 * association next time. This works around some broken APs
2118 * which do not correctly reject reassociation requests. */
2119 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2120 return;
2121 }
2122
2123 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2124 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
2125 "set\n", sdata->dev->name, aid);
2126 aid &= ~(BIT(15) | BIT(14));
2127
2128 pos = mgmt->u.assoc_resp.variable;
2129 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2130
2131 if (!elems.supp_rates) {
2132 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2133 sdata->dev->name);
2134 return;
2135 }
2136
2137 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
2138 ifsta->aid = aid;
2139 ifsta->ap_capab = capab_info;
2140
2141 kfree(ifsta->assocresp_ies);
2142 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
2143 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
2144 if (ifsta->assocresp_ies)
2145 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
2146
2147 rcu_read_lock();
2148
2149 /* Add STA entry for the AP */
2150 sta = sta_info_get(local, ifsta->bssid);
2151 if (!sta) {
2152 struct ieee80211_sta_bss *bss;
2153 int err;
2154
2155 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
2156 if (!sta) {
2157 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
2158 " the AP\n", sdata->dev->name);
2159 rcu_read_unlock();
2160 return;
2161 }
2162 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
2163 local->hw.conf.channel->center_freq,
2164 ifsta->ssid, ifsta->ssid_len);
2165 if (bss) {
2166 sta->last_signal = bss->signal;
2167 sta->last_qual = bss->qual;
2168 sta->last_noise = bss->noise;
2169 ieee80211_rx_bss_put(local, bss);
2170 }
2171
2172 err = sta_info_insert(sta);
2173 if (err) {
2174 printk(KERN_DEBUG "%s: failed to insert STA entry for"
2175 " the AP (error %d)\n", sdata->dev->name, err);
2176 rcu_read_unlock();
2177 return;
2178 }
2179 /* update new sta with its last rx activity */
2180 sta->last_rx = jiffies;
2181 }
2182
2183 /*
2184 * FIXME: Do we really need to update the sta_info's information here?
2185 * We already know about the AP (we found it in our list) so it
2186 * should already be filled with the right info, no?
2187 * As is stands, all this is racy because typically we assume
2188 * the information that is filled in here (except flags) doesn't
2189 * change while a STA structure is alive. As such, it should move
2190 * to between the sta_info_alloc() and sta_info_insert() above.
2191 */
2192
2193 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
2194 WLAN_STA_AUTHORIZED);
2195
2196 rates = 0;
2197 basic_rates = 0;
2198 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2199
2200 for (i = 0; i < elems.supp_rates_len; i++) {
2201 int rate = (elems.supp_rates[i] & 0x7f) * 5;
2202
2203 if (rate > 110)
2204 have_higher_than_11mbit = true;
2205
2206 for (j = 0; j < sband->n_bitrates; j++) {
2207 if (sband->bitrates[j].bitrate == rate)
2208 rates |= BIT(j);
2209 if (elems.supp_rates[i] & 0x80)
2210 basic_rates |= BIT(j);
2211 }
2212 }
2213
2214 for (i = 0; i < elems.ext_supp_rates_len; i++) {
2215 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
2216
2217 if (rate > 110)
2218 have_higher_than_11mbit = true;
2219
2220 for (j = 0; j < sband->n_bitrates; j++) {
2221 if (sband->bitrates[j].bitrate == rate)
2222 rates |= BIT(j);
2223 if (elems.ext_supp_rates[i] & 0x80)
2224 basic_rates |= BIT(j);
2225 }
2226 }
2227
2228 sta->supp_rates[local->hw.conf.channel->band] = rates;
2229 sdata->basic_rates = basic_rates;
2230
2231 /* cf. IEEE 802.11 9.2.12 */
2232 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
2233 have_higher_than_11mbit)
2234 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
2235 else
2236 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
2237
2238 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2239 (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
2240 struct ieee80211_ht_bss_info bss_info;
2241 ieee80211_ht_cap_ie_to_ht_info(
2242 (struct ieee80211_ht_cap *)
2243 elems.ht_cap_elem, &sta->ht_info);
2244 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2245 (struct ieee80211_ht_addt_info *)
2246 elems.ht_info_elem, &bss_info);
2247 ieee80211_handle_ht(local, 1, &sta->ht_info, &bss_info);
2248 }
2249
2250 rate_control_rate_init(sta, local);
2251
2252 if (elems.wmm_param) {
2253 set_sta_flags(sta, WLAN_STA_WME);
2254 rcu_read_unlock();
2255 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
2256 elems.wmm_param_len);
2257 } else
2258 rcu_read_unlock();
2259
2260 /* set AID and assoc capability,
2261 * ieee80211_set_associated() will tell the driver */
2262 bss_conf->aid = aid;
2263 bss_conf->assoc_capability = capab_info;
2264 ieee80211_set_associated(sdata, ifsta);
2265
2266 ieee80211_associated(sdata, ifsta);
2267 }
2268
2269
2270 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
2271 struct ieee80211_if_sta *ifsta,
2272 struct ieee80211_sta_bss *bss)
2273 {
2274 struct ieee80211_local *local = sdata->local;
2275 int res, rates, i, j;
2276 struct sk_buff *skb;
2277 struct ieee80211_mgmt *mgmt;
2278 u8 *pos;
2279 struct ieee80211_supported_band *sband;
2280 union iwreq_data wrqu;
2281
2282 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2283
2284 /* Remove possible STA entries from other IBSS networks. */
2285 sta_info_flush_delayed(sdata);
2286
2287 if (local->ops->reset_tsf) {
2288 /* Reset own TSF to allow time synchronization work. */
2289 local->ops->reset_tsf(local_to_hw(local));
2290 }
2291 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2292 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2293 if (res)
2294 return res;
2295
2296 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2297
2298 sdata->drop_unencrypted = bss->capability &
2299 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2300
2301 res = ieee80211_set_freq(sdata, bss->freq);
2302
2303 if (res)
2304 return res;
2305
2306 /* Build IBSS probe response */
2307 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2308 if (skb) {
2309 skb_reserve(skb, local->hw.extra_tx_headroom);
2310
2311 mgmt = (struct ieee80211_mgmt *)
2312 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2313 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2314 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2315 IEEE80211_STYPE_PROBE_RESP);
2316 memset(mgmt->da, 0xff, ETH_ALEN);
2317 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
2318 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2319 mgmt->u.beacon.beacon_int =
2320 cpu_to_le16(local->hw.conf.beacon_int);
2321 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
2322 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2323
2324 pos = skb_put(skb, 2 + ifsta->ssid_len);
2325 *pos++ = WLAN_EID_SSID;
2326 *pos++ = ifsta->ssid_len;
2327 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2328
2329 rates = bss->supp_rates_len;
2330 if (rates > 8)
2331 rates = 8;
2332 pos = skb_put(skb, 2 + rates);
2333 *pos++ = WLAN_EID_SUPP_RATES;
2334 *pos++ = rates;
2335 memcpy(pos, bss->supp_rates, rates);
2336
2337 if (bss->band == IEEE80211_BAND_2GHZ) {
2338 pos = skb_put(skb, 2 + 1);
2339 *pos++ = WLAN_EID_DS_PARAMS;
2340 *pos++ = 1;
2341 *pos++ = ieee80211_frequency_to_channel(bss->freq);
2342 }
2343
2344 pos = skb_put(skb, 2 + 2);
2345 *pos++ = WLAN_EID_IBSS_PARAMS;
2346 *pos++ = 2;
2347 /* FIX: set ATIM window based on scan results */
2348 *pos++ = 0;
2349 *pos++ = 0;
2350
2351 if (bss->supp_rates_len > 8) {
2352 rates = bss->supp_rates_len - 8;
2353 pos = skb_put(skb, 2 + rates);
2354 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2355 *pos++ = rates;
2356 memcpy(pos, &bss->supp_rates[8], rates);
2357 }
2358
2359 ifsta->probe_resp = skb;
2360
2361 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
2362 }
2363
2364 rates = 0;
2365 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2366 for (i = 0; i < bss->supp_rates_len; i++) {
2367 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2368 for (j = 0; j < sband->n_bitrates; j++)
2369 if (sband->bitrates[j].bitrate == bitrate)
2370 rates |= BIT(j);
2371 }
2372 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
2373
2374 ieee80211_sta_def_wmm_params(sdata, bss, 1);
2375
2376 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
2377 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2378
2379 memset(&wrqu, 0, sizeof(wrqu));
2380 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2381 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
2382
2383 return res;
2384 }
2385
2386 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
2387 struct ieee802_11_elems *elems,
2388 enum ieee80211_band band)
2389 {
2390 struct ieee80211_supported_band *sband;
2391 struct ieee80211_rate *bitrates;
2392 size_t num_rates;
2393 u64 supp_rates;
2394 int i, j;
2395 sband = local->hw.wiphy->bands[band];
2396
2397 if (!sband) {
2398 WARN_ON(1);
2399 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2400 }
2401
2402 bitrates = sband->bitrates;
2403 num_rates = sband->n_bitrates;
2404 supp_rates = 0;
2405 for (i = 0; i < elems->supp_rates_len +
2406 elems->ext_supp_rates_len; i++) {
2407 u8 rate = 0;
2408 int own_rate;
2409 if (i < elems->supp_rates_len)
2410 rate = elems->supp_rates[i];
2411 else if (elems->ext_supp_rates)
2412 rate = elems->ext_supp_rates
2413 [i - elems->supp_rates_len];
2414 own_rate = 5 * (rate & 0x7f);
2415 for (j = 0; j < num_rates; j++)
2416 if (bitrates[j].bitrate == own_rate)
2417 supp_rates |= BIT(j);
2418 }
2419 return supp_rates;
2420 }
2421
2422 static u64 ieee80211_sta_get_mandatory_rates(struct ieee80211_local *local,
2423 enum ieee80211_band band)
2424 {
2425 struct ieee80211_supported_band *sband;
2426 struct ieee80211_rate *bitrates;
2427 u64 mandatory_rates;
2428 enum ieee80211_rate_flags mandatory_flag;
2429 int i;
2430
2431 sband = local->hw.wiphy->bands[band];
2432 if (!sband) {
2433 WARN_ON(1);
2434 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2435 }
2436
2437 if (band == IEEE80211_BAND_2GHZ)
2438 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
2439 else
2440 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
2441
2442 bitrates = sband->bitrates;
2443 mandatory_rates = 0;
2444 for (i = 0; i < sband->n_bitrates; i++)
2445 if (bitrates[i].flags & mandatory_flag)
2446 mandatory_rates |= BIT(i);
2447 return mandatory_rates;
2448 }
2449
2450 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2451 struct ieee80211_mgmt *mgmt,
2452 size_t len,
2453 struct ieee80211_rx_status *rx_status,
2454 struct ieee802_11_elems *elems)
2455 {
2456 struct ieee80211_local *local = sdata->local;
2457 int freq, clen;
2458 struct ieee80211_sta_bss *bss;
2459 struct sta_info *sta;
2460 struct ieee80211_channel *channel;
2461 u64 beacon_timestamp, rx_timestamp;
2462 u64 supp_rates = 0;
2463 bool beacon = ieee80211_is_beacon(mgmt->frame_control);
2464 enum ieee80211_band band = rx_status->band;
2465 DECLARE_MAC_BUF(mac);
2466 DECLARE_MAC_BUF(mac2);
2467
2468 if (elems->ds_params && elems->ds_params_len == 1)
2469 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
2470 else
2471 freq = rx_status->freq;
2472
2473 channel = ieee80211_get_channel(local->hw.wiphy, freq);
2474
2475 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2476 return;
2477
2478 if (ieee80211_vif_is_mesh(&sdata->vif) && elems->mesh_id &&
2479 elems->mesh_config && mesh_matches_local(elems, sdata)) {
2480 supp_rates = ieee80211_sta_get_rates(local, elems, band);
2481
2482 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
2483 mesh_peer_accepts_plinks(elems));
2484 }
2485
2486 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && elems->supp_rates &&
2487 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
2488 supp_rates = ieee80211_sta_get_rates(local, elems, band);
2489
2490 rcu_read_lock();
2491
2492 sta = sta_info_get(local, mgmt->sa);
2493 if (sta) {
2494 u64 prev_rates;
2495
2496 prev_rates = sta->supp_rates[band];
2497 /* make sure mandatory rates are always added */
2498 sta->supp_rates[band] = supp_rates |
2499 ieee80211_sta_get_mandatory_rates(local, band);
2500
2501 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2502 if (sta->supp_rates[band] != prev_rates)
2503 printk(KERN_DEBUG "%s: updated supp_rates set "
2504 "for %s based on beacon info (0x%llx | "
2505 "0x%llx -> 0x%llx)\n",
2506 sdata->dev->name, print_mac(mac, sta->addr),
2507 (unsigned long long) prev_rates,
2508 (unsigned long long) supp_rates,
2509 (unsigned long long) sta->supp_rates[band]);
2510 #endif
2511 } else {
2512 ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
2513 mgmt->sa, supp_rates);
2514 }
2515
2516 rcu_read_unlock();
2517 }
2518
2519 #ifdef CONFIG_MAC80211_MESH
2520 if (elems->mesh_config)
2521 bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id,
2522 elems->mesh_id_len, elems->mesh_config, freq);
2523 else
2524 #endif
2525 bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq,
2526 elems->ssid, elems->ssid_len);
2527 if (!bss) {
2528 #ifdef CONFIG_MAC80211_MESH
2529 if (elems->mesh_config)
2530 bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id,
2531 elems->mesh_id_len, elems->mesh_config,
2532 elems->mesh_config_len, freq);
2533 else
2534 #endif
2535 bss = ieee80211_rx_bss_add(sdata, mgmt->bssid, freq,
2536 elems->ssid, elems->ssid_len);
2537 if (!bss)
2538 return;
2539 } else {
2540 #if 0
2541 /* TODO: order by RSSI? */
2542 spin_lock_bh(&local->sta_bss_lock);
2543 list_move_tail(&bss->list, &local->sta_bss_list);
2544 spin_unlock_bh(&local->sta_bss_lock);
2545 #endif
2546 }
2547
2548 /* save the ERP value so that it is available at association time */
2549 if (elems->erp_info && elems->erp_info_len >= 1) {
2550 bss->erp_value = elems->erp_info[0];
2551 bss->has_erp_value = 1;
2552 }
2553
2554 bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
2555 bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
2556
2557 if (elems->tim) {
2558 struct ieee80211_tim_ie *tim_ie =
2559 (struct ieee80211_tim_ie *)elems->tim;
2560 bss->dtim_period = tim_ie->dtim_period;
2561 }
2562
2563 /* set default value for buggy APs */
2564 if (!elems->tim || bss->dtim_period == 0)
2565 bss->dtim_period = 1;
2566
2567 bss->supp_rates_len = 0;
2568 if (elems->supp_rates) {
2569 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2570 if (clen > elems->supp_rates_len)
2571 clen = elems->supp_rates_len;
2572 memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates,
2573 clen);
2574 bss->supp_rates_len += clen;
2575 }
2576 if (elems->ext_supp_rates) {
2577 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2578 if (clen > elems->ext_supp_rates_len)
2579 clen = elems->ext_supp_rates_len;
2580 memcpy(&bss->supp_rates[bss->supp_rates_len],
2581 elems->ext_supp_rates, clen);
2582 bss->supp_rates_len += clen;
2583 }
2584
2585 bss->band = band;
2586
2587 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
2588
2589 bss->timestamp = beacon_timestamp;
2590 bss->last_update = jiffies;
2591 bss->signal = rx_status->signal;
2592 bss->noise = rx_status->noise;
2593 bss->qual = rx_status->qual;
2594 if (!beacon)
2595 bss->last_probe_resp = jiffies;
2596 /*
2597 * In STA mode, the remaining parameters should not be overridden
2598 * by beacons because they're not necessarily accurate there.
2599 */
2600 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
2601 bss->last_probe_resp && beacon) {
2602 ieee80211_rx_bss_put(local, bss);
2603 return;
2604 }
2605
2606 if (bss->ies == NULL || bss->ies_len < elems->total_len) {
2607 kfree(bss->ies);
2608 bss->ies = kmalloc(elems->total_len, GFP_ATOMIC);
2609 }
2610 if (bss->ies) {
2611 memcpy(bss->ies, elems->ie_start, elems->total_len);
2612 bss->ies_len = elems->total_len;
2613 } else
2614 bss->ies_len = 0;
2615
2616 bss->wmm_used = elems->wmm_param || elems->wmm_info;
2617
2618 /* check if we need to merge IBSS */
2619 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
2620 !local->sta_sw_scanning && !local->sta_hw_scanning &&
2621 bss->capability & WLAN_CAPABILITY_IBSS &&
2622 bss->freq == local->oper_channel->center_freq &&
2623 elems->ssid_len == sdata->u.sta.ssid_len &&
2624 memcmp(elems->ssid, sdata->u.sta.ssid,
2625 sdata->u.sta.ssid_len) == 0) {
2626 if (rx_status->flag & RX_FLAG_TSFT) {
2627 /* in order for correct IBSS merging we need mactime
2628 *
2629 * since mactime is defined as the time the first data
2630 * symbol of the frame hits the PHY, and the timestamp
2631 * of the beacon is defined as "the time that the data
2632 * symbol containing the first bit of the timestamp is
2633 * transmitted to the PHY plus the transmitting STA’s
2634 * delays through its local PHY from the MAC-PHY
2635 * interface to its interface with the WM"
2636 * (802.11 11.1.2) - equals the time this bit arrives at
2637 * the receiver - we have to take into account the
2638 * offset between the two.
2639 * e.g: at 1 MBit that means mactime is 192 usec earlier
2640 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
2641 */
2642 int rate = local->hw.wiphy->bands[band]->
2643 bitrates[rx_status->rate_idx].bitrate;
2644 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
2645 } else if (local && local->ops && local->ops->get_tsf)
2646 /* second best option: get current TSF */
2647 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
2648 else
2649 /* can't merge without knowing the TSF */
2650 rx_timestamp = -1LLU;
2651 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2652 printk(KERN_DEBUG "RX beacon SA=%s BSSID="
2653 "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
2654 print_mac(mac, mgmt->sa),
2655 print_mac(mac2, mgmt->bssid),
2656 (unsigned long long)rx_timestamp,
2657 (unsigned long long)beacon_timestamp,
2658 (unsigned long long)(rx_timestamp - beacon_timestamp),
2659 jiffies);
2660 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2661 if (beacon_timestamp > rx_timestamp) {
2662 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2663 printk(KERN_DEBUG "%s: beacon TSF higher than "
2664 "local TSF - IBSS merge with BSSID %s\n",
2665 sdata->dev->name, print_mac(mac, mgmt->bssid));
2666 #endif
2667 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
2668 ieee80211_ibss_add_sta(sdata, NULL,
2669 mgmt->bssid, mgmt->sa,
2670 supp_rates);
2671 }
2672 }
2673
2674 ieee80211_rx_bss_put(local, bss);
2675 }
2676
2677
2678 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2679 struct ieee80211_mgmt *mgmt,
2680 size_t len,
2681 struct ieee80211_rx_status *rx_status)
2682 {
2683 size_t baselen;
2684 struct ieee802_11_elems elems;
2685 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2686
2687 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
2688 return; /* ignore ProbeResp to foreign address */
2689
2690 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2691 if (baselen > len)
2692 return;
2693
2694 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2695 &elems);
2696
2697 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2698
2699 /* direct probe may be part of the association flow */
2700 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
2701 &ifsta->request)) {
2702 printk(KERN_DEBUG "%s direct probe responded\n",
2703 sdata->dev->name);
2704 ieee80211_authenticate(sdata, ifsta);
2705 }
2706 }
2707
2708
2709 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2710 struct ieee80211_mgmt *mgmt,
2711 size_t len,
2712 struct ieee80211_rx_status *rx_status)
2713 {
2714 struct ieee80211_if_sta *ifsta;
2715 size_t baselen;
2716 struct ieee802_11_elems elems;
2717 struct ieee80211_local *local = sdata->local;
2718 struct ieee80211_conf *conf = &local->hw.conf;
2719 u32 changed = 0;
2720
2721 /* Process beacon from the current BSS */
2722 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2723 if (baselen > len)
2724 return;
2725
2726 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
2727
2728 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2729
2730 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2731 return;
2732 ifsta = &sdata->u.sta;
2733
2734 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
2735 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
2736 return;
2737
2738 /* Do not send changes to driver if we are scanning. This removes
2739 * requirement that a driver's bss_info_changed/conf_tx functions
2740 * need to be atomic.
2741 * This is really ugly code, we should rewrite scanning and make
2742 * all this more understandable for humans.
2743 */
2744 if (local->sta_sw_scanning || local->sta_hw_scanning)
2745 return;
2746
2747 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
2748 elems.wmm_param_len);
2749
2750 if (elems.erp_info && elems.erp_info_len >= 1)
2751 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
2752 else {
2753 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
2754 changed |= ieee80211_handle_protect_preamb(sdata, false,
2755 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
2756 }
2757
2758 if (elems.ht_cap_elem && elems.ht_info_elem &&
2759 elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
2760 struct ieee80211_ht_bss_info bss_info;
2761
2762 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2763 (struct ieee80211_ht_addt_info *)
2764 elems.ht_info_elem, &bss_info);
2765 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
2766 &bss_info);
2767 }
2768
2769 ieee80211_bss_info_change_notify(sdata, changed);
2770 }
2771
2772
2773 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
2774 struct ieee80211_if_sta *ifsta,
2775 struct ieee80211_mgmt *mgmt,
2776 size_t len,
2777 struct ieee80211_rx_status *rx_status)
2778 {
2779 struct ieee80211_local *local = sdata->local;
2780 int tx_last_beacon;
2781 struct sk_buff *skb;
2782 struct ieee80211_mgmt *resp;
2783 u8 *pos, *end;
2784 DECLARE_MAC_BUF(mac);
2785 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2786 DECLARE_MAC_BUF(mac2);
2787 DECLARE_MAC_BUF(mac3);
2788 #endif
2789
2790 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS ||
2791 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
2792 len < 24 + 2 || !ifsta->probe_resp)
2793 return;
2794
2795 if (local->ops->tx_last_beacon)
2796 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2797 else
2798 tx_last_beacon = 1;
2799
2800 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2801 printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
2802 "%s (tx_last_beacon=%d)\n",
2803 sdata->dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
2804 print_mac(mac3, mgmt->bssid), tx_last_beacon);
2805 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2806
2807 if (!tx_last_beacon)
2808 return;
2809
2810 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2811 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2812 return;
2813
2814 end = ((u8 *) mgmt) + len;
2815 pos = mgmt->u.probe_req.variable;
2816 if (pos[0] != WLAN_EID_SSID ||
2817 pos + 2 + pos[1] > end) {
2818 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2819 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2820 "from %s\n",
2821 sdata->dev->name, print_mac(mac, mgmt->sa));
2822 #endif
2823 return;
2824 }
2825 if (pos[1] != 0 &&
2826 (pos[1] != ifsta->ssid_len ||
2827 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
2828 /* Ignore ProbeReq for foreign SSID */
2829 return;
2830 }
2831
2832 /* Reply with ProbeResp */
2833 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
2834 if (!skb)
2835 return;
2836
2837 resp = (struct ieee80211_mgmt *) skb->data;
2838 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2839 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2840 printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
2841 sdata->dev->name, print_mac(mac, resp->da));
2842 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2843 ieee80211_sta_tx(sdata, skb, 0);
2844 }
2845
2846 static void ieee80211_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
2847 struct ieee80211_if_sta *ifsta,
2848 struct ieee80211_mgmt *mgmt,
2849 size_t len,
2850 struct ieee80211_rx_status *rx_status)
2851 {
2852 struct ieee80211_local *local = sdata->local;
2853
2854 /* all categories we currently handle have action_code */
2855 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2856 return;
2857
2858 switch (mgmt->u.action.category) {
2859 case WLAN_CATEGORY_SPECTRUM_MGMT:
2860 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2861 break;
2862 switch (mgmt->u.action.u.measurement.action_code) {
2863 case WLAN_ACTION_SPCT_MSR_REQ:
2864 if (len < (IEEE80211_MIN_ACTION_SIZE +
2865 sizeof(mgmt->u.action.u.measurement)))
2866 break;
2867 ieee80211_sta_process_measurement_req(sdata, mgmt, len);
2868 break;
2869 }
2870 break;
2871 case WLAN_CATEGORY_BACK:
2872 switch (mgmt->u.action.u.addba_req.action_code) {
2873 case WLAN_ACTION_ADDBA_REQ:
2874 if (len < (IEEE80211_MIN_ACTION_SIZE +
2875 sizeof(mgmt->u.action.u.addba_req)))
2876 break;
2877 ieee80211_sta_process_addba_request(local, mgmt, len);
2878 break;
2879 case WLAN_ACTION_ADDBA_RESP:
2880 if (len < (IEEE80211_MIN_ACTION_SIZE +
2881 sizeof(mgmt->u.action.u.addba_resp)))
2882 break;
2883 ieee80211_sta_process_addba_resp(local, mgmt, len);
2884 break;
2885 case WLAN_ACTION_DELBA:
2886 if (len < (IEEE80211_MIN_ACTION_SIZE +
2887 sizeof(mgmt->u.action.u.delba)))
2888 break;
2889 ieee80211_sta_process_delba(sdata, mgmt, len);
2890 break;
2891 }
2892 break;
2893 case PLINK_CATEGORY:
2894 if (ieee80211_vif_is_mesh(&sdata->vif))
2895 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
2896 break;
2897 case MESH_PATH_SEL_CATEGORY:
2898 if (ieee80211_vif_is_mesh(&sdata->vif))
2899 mesh_rx_path_sel_frame(sdata, mgmt, len);
2900 break;
2901 }
2902 }
2903
2904 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
2905 struct ieee80211_rx_status *rx_status)
2906 {
2907 struct ieee80211_local *local = sdata->local;
2908 struct ieee80211_if_sta *ifsta;
2909 struct ieee80211_mgmt *mgmt;
2910 u16 fc;
2911
2912 if (skb->len < 24)
2913 goto fail;
2914
2915 ifsta = &sdata->u.sta;
2916
2917 mgmt = (struct ieee80211_mgmt *) skb->data;
2918 fc = le16_to_cpu(mgmt->frame_control);
2919
2920 switch (fc & IEEE80211_FCTL_STYPE) {
2921 case IEEE80211_STYPE_PROBE_REQ:
2922 case IEEE80211_STYPE_PROBE_RESP:
2923 case IEEE80211_STYPE_BEACON:
2924 case IEEE80211_STYPE_ACTION:
2925 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2926 case IEEE80211_STYPE_AUTH:
2927 case IEEE80211_STYPE_ASSOC_RESP:
2928 case IEEE80211_STYPE_REASSOC_RESP:
2929 case IEEE80211_STYPE_DEAUTH:
2930 case IEEE80211_STYPE_DISASSOC:
2931 skb_queue_tail(&ifsta->skb_queue, skb);
2932 queue_work(local->hw.workqueue, &ifsta->work);
2933 return;
2934 }
2935
2936 fail:
2937 kfree_skb(skb);
2938 }
2939
2940 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2941 struct sk_buff *skb)
2942 {
2943 struct ieee80211_rx_status *rx_status;
2944 struct ieee80211_if_sta *ifsta;
2945 struct ieee80211_mgmt *mgmt;
2946 u16 fc;
2947
2948 ifsta = &sdata->u.sta;
2949
2950 rx_status = (struct ieee80211_rx_status *) skb->cb;
2951 mgmt = (struct ieee80211_mgmt *) skb->data;
2952 fc = le16_to_cpu(mgmt->frame_control);
2953
2954 switch (fc & IEEE80211_FCTL_STYPE) {
2955 case IEEE80211_STYPE_PROBE_REQ:
2956 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
2957 rx_status);
2958 break;
2959 case IEEE80211_STYPE_PROBE_RESP:
2960 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
2961 break;
2962 case IEEE80211_STYPE_BEACON:
2963 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2964 break;
2965 case IEEE80211_STYPE_AUTH:
2966 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2967 break;
2968 case IEEE80211_STYPE_ASSOC_RESP:
2969 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2970 break;
2971 case IEEE80211_STYPE_REASSOC_RESP:
2972 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2973 break;
2974 case IEEE80211_STYPE_DEAUTH:
2975 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2976 break;
2977 case IEEE80211_STYPE_DISASSOC:
2978 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2979 break;
2980 case IEEE80211_STYPE_ACTION:
2981 ieee80211_rx_mgmt_action(sdata, ifsta, mgmt, skb->len, rx_status);
2982 break;
2983 }
2984
2985 kfree_skb(skb);
2986 }
2987
2988
2989 ieee80211_rx_result
2990 ieee80211_sta_rx_scan(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
2991 struct ieee80211_rx_status *rx_status)
2992 {
2993 struct ieee80211_mgmt *mgmt;
2994 __le16 fc;
2995
2996 if (skb->len < 2)
2997 return RX_DROP_UNUSABLE;
2998
2999 mgmt = (struct ieee80211_mgmt *) skb->data;
3000 fc = mgmt->frame_control;
3001
3002 if (ieee80211_is_ctl(fc))
3003 return RX_CONTINUE;
3004
3005 if (skb->len < 24)
3006 return RX_DROP_MONITOR;
3007
3008 if (ieee80211_is_probe_resp(fc)) {
3009 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
3010 dev_kfree_skb(skb);
3011 return RX_QUEUED;
3012 }
3013
3014 if (ieee80211_is_beacon(fc)) {
3015 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3016 dev_kfree_skb(skb);
3017 return RX_QUEUED;
3018 }
3019
3020 return RX_CONTINUE;
3021 }
3022
3023
3024 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
3025 {
3026 struct ieee80211_local *local = sdata->local;
3027 int active = 0;
3028 struct sta_info *sta;
3029
3030 rcu_read_lock();
3031
3032 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3033 if (sta->sdata == sdata &&
3034 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
3035 jiffies)) {
3036 active++;
3037 break;
3038 }
3039 }
3040
3041 rcu_read_unlock();
3042
3043 return active;
3044 }
3045
3046
3047 static void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, unsigned long exp_time)
3048 {
3049 struct ieee80211_local *local = sdata->local;
3050 struct sta_info *sta, *tmp;
3051 LIST_HEAD(tmp_list);
3052 DECLARE_MAC_BUF(mac);
3053 unsigned long flags;
3054
3055 spin_lock_irqsave(&local->sta_lock, flags);
3056 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
3057 if (time_after(jiffies, sta->last_rx + exp_time)) {
3058 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3059 printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
3060 sdata->dev->name, print_mac(mac, sta->addr));
3061 #endif
3062 __sta_info_unlink(&sta);
3063 if (sta)
3064 list_add(&sta->list, &tmp_list);
3065 }
3066 spin_unlock_irqrestore(&local->sta_lock, flags);
3067
3068 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
3069 sta_info_destroy(sta);
3070 }
3071
3072
3073 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
3074 struct ieee80211_if_sta *ifsta)
3075 {
3076 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
3077
3078 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
3079 if (ieee80211_sta_active_ibss(sdata))
3080 return;
3081
3082 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
3083 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
3084 ieee80211_sta_req_scan(sdata, ifsta->ssid, ifsta->ssid_len);
3085 }
3086
3087
3088 #ifdef CONFIG_MAC80211_MESH
3089 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
3090 struct ieee80211_if_sta *ifsta)
3091 {
3092 bool free_plinks;
3093
3094 ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
3095 mesh_path_expire(sdata);
3096
3097 free_plinks = mesh_plink_availables(sdata);
3098 if (free_plinks != sdata->u.sta.accepting_plinks)
3099 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3100
3101 mod_timer(&ifsta->timer, jiffies +
3102 IEEE80211_MESH_HOUSEKEEPING_INTERVAL);
3103 }
3104
3105
3106 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
3107 {
3108 struct ieee80211_if_sta *ifsta;
3109 ifsta = &sdata->u.sta;
3110 ifsta->state = IEEE80211_STA_MLME_MESH_UP;
3111 ieee80211_sta_timer((unsigned long)sdata);
3112 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3113 }
3114 #endif
3115
3116
3117 void ieee80211_sta_timer(unsigned long data)
3118 {
3119 struct ieee80211_sub_if_data *sdata =
3120 (struct ieee80211_sub_if_data *) data;
3121 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3122 struct ieee80211_local *local = sdata->local;
3123
3124 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3125 queue_work(local->hw.workqueue, &ifsta->work);
3126 }
3127
3128 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
3129 struct ieee80211_if_sta *ifsta)
3130 {
3131 struct ieee80211_local *local = sdata->local;
3132
3133 if (local->ops->reset_tsf) {
3134 /* Reset own TSF to allow time synchronization work. */
3135 local->ops->reset_tsf(local_to_hw(local));
3136 }
3137
3138 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
3139
3140
3141 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
3142 ifsta->auth_alg = WLAN_AUTH_OPEN;
3143 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
3144 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
3145 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
3146 ifsta->auth_alg = WLAN_AUTH_LEAP;
3147 else
3148 ifsta->auth_alg = WLAN_AUTH_OPEN;
3149 ifsta->auth_transaction = -1;
3150 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
3151 ifsta->assoc_scan_tries = 0;
3152 ifsta->direct_probe_tries = 0;
3153 ifsta->auth_tries = 0;
3154 ifsta->assoc_tries = 0;
3155 netif_tx_stop_all_queues(sdata->dev);
3156 netif_carrier_off(sdata->dev);
3157 }
3158
3159
3160 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
3161 struct ieee80211_if_sta *ifsta)
3162 {
3163 struct ieee80211_local *local = sdata->local;
3164
3165 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3166 return;
3167
3168 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
3169 IEEE80211_STA_AUTO_BSSID_SEL)) &&
3170 (ifsta->flags & (IEEE80211_STA_SSID_SET |
3171 IEEE80211_STA_AUTO_SSID_SEL))) {
3172
3173 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
3174 ieee80211_set_disassoc(sdata, ifsta, true, true,
3175 WLAN_REASON_DEAUTH_LEAVING);
3176
3177 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3178 queue_work(local->hw.workqueue, &ifsta->work);
3179 }
3180 }
3181
3182 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
3183 const char *ssid, int ssid_len)
3184 {
3185 int tmp, hidden_ssid;
3186
3187 if (ssid_len == ifsta->ssid_len &&
3188 !memcmp(ifsta->ssid, ssid, ssid_len))
3189 return 1;
3190
3191 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
3192 return 0;
3193
3194 hidden_ssid = 1;
3195 tmp = ssid_len;
3196 while (tmp--) {
3197 if (ssid[tmp] != '\0') {
3198 hidden_ssid = 0;
3199 break;
3200 }
3201 }
3202
3203 if (hidden_ssid && ifsta->ssid_len == ssid_len)
3204 return 1;
3205
3206 if (ssid_len == 1 && ssid[0] == ' ')
3207 return 1;
3208
3209 return 0;
3210 }
3211
3212 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
3213 struct ieee80211_if_sta *ifsta)
3214 {
3215 struct ieee80211_local *local = sdata->local;
3216 struct ieee80211_sta_bss *bss;
3217 struct ieee80211_supported_band *sband;
3218 u8 bssid[ETH_ALEN], *pos;
3219 int i;
3220 int ret;
3221 DECLARE_MAC_BUF(mac);
3222
3223 #if 0
3224 /* Easier testing, use fixed BSSID. */
3225 memset(bssid, 0xfe, ETH_ALEN);
3226 #else
3227 /* Generate random, not broadcast, locally administered BSSID. Mix in
3228 * own MAC address to make sure that devices that do not have proper
3229 * random number generator get different BSSID. */
3230 get_random_bytes(bssid, ETH_ALEN);
3231 for (i = 0; i < ETH_ALEN; i++)
3232 bssid[i] ^= sdata->dev->dev_addr[i];
3233 bssid[0] &= ~0x01;
3234 bssid[0] |= 0x02;
3235 #endif
3236
3237 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
3238 sdata->dev->name, print_mac(mac, bssid));
3239
3240 bss = ieee80211_rx_bss_add(sdata, bssid,
3241 local->hw.conf.channel->center_freq,
3242 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
3243 if (!bss)
3244 return -ENOMEM;
3245
3246 bss->band = local->hw.conf.channel->band;
3247 sband = local->hw.wiphy->bands[bss->band];
3248
3249 if (local->hw.conf.beacon_int == 0)
3250 local->hw.conf.beacon_int = 100;
3251 bss->beacon_int = local->hw.conf.beacon_int;
3252 bss->last_update = jiffies;
3253 bss->capability = WLAN_CAPABILITY_IBSS;
3254
3255 if (sdata->default_key)
3256 bss->capability |= WLAN_CAPABILITY_PRIVACY;
3257 else
3258 sdata->drop_unencrypted = 0;
3259
3260 bss->supp_rates_len = sband->n_bitrates;
3261 pos = bss->supp_rates;
3262 for (i = 0; i < sband->n_bitrates; i++) {
3263 int rate = sband->bitrates[i].bitrate;
3264 *pos++ = (u8) (rate / 5);
3265 }
3266
3267 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
3268 ieee80211_rx_bss_put(local, bss);
3269 return ret;
3270 }
3271
3272
3273 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
3274 struct ieee80211_if_sta *ifsta)
3275 {
3276 struct ieee80211_local *local = sdata->local;
3277 struct ieee80211_sta_bss *bss;
3278 int found = 0;
3279 u8 bssid[ETH_ALEN];
3280 int active_ibss;
3281 DECLARE_MAC_BUF(mac);
3282 DECLARE_MAC_BUF(mac2);
3283
3284 if (ifsta->ssid_len == 0)
3285 return -EINVAL;
3286
3287 active_ibss = ieee80211_sta_active_ibss(sdata);
3288 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3289 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
3290 sdata->dev->name, active_ibss);
3291 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3292 spin_lock_bh(&local->sta_bss_lock);
3293 list_for_each_entry(bss, &local->sta_bss_list, list) {
3294 if (ifsta->ssid_len != bss->ssid_len ||
3295 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
3296 || !(bss->capability & WLAN_CAPABILITY_IBSS))
3297 continue;
3298 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3299 printk(KERN_DEBUG " bssid=%s found\n",
3300 print_mac(mac, bss->bssid));
3301 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3302 memcpy(bssid, bss->bssid, ETH_ALEN);
3303 found = 1;
3304 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
3305 break;
3306 }
3307 spin_unlock_bh(&local->sta_bss_lock);
3308
3309 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3310 if (found)
3311 printk(KERN_DEBUG " sta_find_ibss: selected %s current "
3312 "%s\n", print_mac(mac, bssid),
3313 print_mac(mac2, ifsta->bssid));
3314 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3315
3316 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3317 int ret;
3318 int search_freq;
3319
3320 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
3321 search_freq = bss->freq;
3322 else
3323 search_freq = local->hw.conf.channel->center_freq;
3324
3325 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
3326 ifsta->ssid, ifsta->ssid_len);
3327 if (!bss)
3328 goto dont_join;
3329
3330 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
3331 " based on configured SSID\n",
3332 sdata->dev->name, print_mac(mac, bssid));
3333 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
3334 ieee80211_rx_bss_put(local, bss);
3335 return ret;
3336 }
3337
3338 dont_join:
3339 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3340 printk(KERN_DEBUG " did not try to join ibss\n");
3341 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3342
3343 /* Selected IBSS not found in current scan results - try to scan */
3344 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
3345 !ieee80211_sta_active_ibss(sdata)) {
3346 mod_timer(&ifsta->timer, jiffies +
3347 IEEE80211_IBSS_MERGE_INTERVAL);
3348 } else if (time_after(jiffies, local->last_scan_completed +
3349 IEEE80211_SCAN_INTERVAL)) {
3350 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
3351 "join\n", sdata->dev->name);
3352 return ieee80211_sta_req_scan(sdata, ifsta->ssid,
3353 ifsta->ssid_len);
3354 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
3355 int interval = IEEE80211_SCAN_INTERVAL;
3356
3357 if (time_after(jiffies, ifsta->ibss_join_req +
3358 IEEE80211_IBSS_JOIN_TIMEOUT)) {
3359 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
3360 (!(local->oper_channel->flags &
3361 IEEE80211_CHAN_NO_IBSS)))
3362 return ieee80211_sta_create_ibss(sdata, ifsta);
3363 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
3364 printk(KERN_DEBUG "%s: IBSS not allowed on"
3365 " %d MHz\n", sdata->dev->name,
3366 local->hw.conf.channel->center_freq);
3367 }
3368
3369 /* No IBSS found - decrease scan interval and continue
3370 * scanning. */
3371 interval = IEEE80211_SCAN_INTERVAL_SLOW;
3372 }
3373
3374 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
3375 mod_timer(&ifsta->timer, jiffies + interval);
3376 return 0;
3377 }
3378
3379 return 0;
3380 }
3381
3382
3383 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
3384 {
3385 struct ieee80211_if_sta *ifsta;
3386 int res;
3387
3388 if (len > IEEE80211_MAX_SSID_LEN)
3389 return -EINVAL;
3390
3391 ifsta = &sdata->u.sta;
3392
3393 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
3394 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
3395 memcpy(ifsta->ssid, ssid, len);
3396 ifsta->ssid_len = len;
3397 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
3398
3399 res = 0;
3400 /*
3401 * Hack! MLME code needs to be cleaned up to have different
3402 * entry points for configuration and internal selection change
3403 */
3404 if (netif_running(sdata->dev))
3405 res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
3406 if (res) {
3407 printk(KERN_DEBUG "%s: Failed to config new SSID to "
3408 "the low-level driver\n", sdata->dev->name);
3409 return res;
3410 }
3411 }
3412
3413 if (len)
3414 ifsta->flags |= IEEE80211_STA_SSID_SET;
3415 else
3416 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
3417
3418 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3419 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
3420 ifsta->ibss_join_req = jiffies;
3421 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
3422 return ieee80211_sta_find_ibss(sdata, ifsta);
3423 }
3424
3425 return 0;
3426 }
3427
3428
3429 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
3430 {
3431 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3432 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
3433 *len = ifsta->ssid_len;
3434 return 0;
3435 }
3436
3437
3438 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
3439 {
3440 struct ieee80211_if_sta *ifsta;
3441 int res;
3442
3443 ifsta = &sdata->u.sta;
3444
3445 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3446 memcpy(ifsta->bssid, bssid, ETH_ALEN);
3447 res = 0;
3448 /*
3449 * Hack! See also ieee80211_sta_set_ssid.
3450 */
3451 if (netif_running(sdata->dev))
3452 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
3453 if (res) {
3454 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
3455 "the low-level driver\n", sdata->dev->name);
3456 return res;
3457 }
3458 }
3459
3460 if (is_valid_ether_addr(bssid))
3461 ifsta->flags |= IEEE80211_STA_BSSID_SET;
3462 else
3463 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
3464
3465 return 0;
3466 }
3467
3468
3469 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
3470 struct ieee80211_sub_if_data *sdata,
3471 int powersave)
3472 {
3473 struct sk_buff *skb;
3474 struct ieee80211_hdr *nullfunc;
3475 __le16 fc;
3476
3477 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
3478 if (!skb) {
3479 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
3480 "frame\n", sdata->dev->name);
3481 return;
3482 }
3483 skb_reserve(skb, local->hw.extra_tx_headroom);
3484
3485 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
3486 memset(nullfunc, 0, 24);
3487 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
3488 IEEE80211_FCTL_TODS);
3489 if (powersave)
3490 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
3491 nullfunc->frame_control = fc;
3492 memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
3493 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
3494 memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
3495
3496 ieee80211_sta_tx(sdata, skb, 0);
3497 }
3498
3499
3500 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3501 {
3502 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
3503 ieee80211_vif_is_mesh(&sdata->vif))
3504 ieee80211_sta_timer((unsigned long)sdata);
3505 }
3506
3507 void ieee80211_scan_completed(struct ieee80211_hw *hw)
3508 {
3509 struct ieee80211_local *local = hw_to_local(hw);
3510 struct net_device *dev = local->scan_dev;
3511 struct ieee80211_sub_if_data *sdata;
3512 union iwreq_data wrqu;
3513
3514 local->last_scan_completed = jiffies;
3515 memset(&wrqu, 0, sizeof(wrqu));
3516 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
3517
3518 if (local->sta_hw_scanning) {
3519 local->sta_hw_scanning = 0;
3520 if (ieee80211_hw_config(local))
3521 printk(KERN_DEBUG "%s: failed to restore operational "
3522 "channel after scan\n", dev->name);
3523 /* Restart STA timer for HW scan case */
3524 rcu_read_lock();
3525 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3526 ieee80211_restart_sta_timer(sdata);
3527 rcu_read_unlock();
3528
3529 goto done;
3530 }
3531
3532 local->sta_sw_scanning = 0;
3533 if (ieee80211_hw_config(local))
3534 printk(KERN_DEBUG "%s: failed to restore operational "
3535 "channel after scan\n", dev->name);
3536
3537
3538 netif_tx_lock_bh(local->mdev);
3539 netif_addr_lock(local->mdev);
3540 local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
3541 local->ops->configure_filter(local_to_hw(local),
3542 FIF_BCN_PRBRESP_PROMISC,
3543 &local->filter_flags,
3544 local->mdev->mc_count,
3545 local->mdev->mc_list);
3546
3547 netif_addr_unlock(local->mdev);
3548 netif_tx_unlock_bh(local->mdev);
3549
3550 rcu_read_lock();
3551 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3552 /* Tell AP we're back */
3553 if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
3554 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
3555 ieee80211_send_nullfunc(local, sdata, 0);
3556 netif_tx_wake_all_queues(sdata->dev);
3557 }
3558 } else
3559 netif_tx_wake_all_queues(sdata->dev);
3560
3561 ieee80211_restart_sta_timer(sdata);
3562 }
3563 rcu_read_unlock();
3564
3565 done:
3566 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3567 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
3568 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3569 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
3570 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
3571 !ieee80211_sta_active_ibss(sdata)))
3572 ieee80211_sta_find_ibss(sdata, ifsta);
3573 }
3574 }
3575 EXPORT_SYMBOL(ieee80211_scan_completed);
3576
3577 void ieee80211_sta_scan_work(struct work_struct *work)
3578 {
3579 struct ieee80211_local *local =
3580 container_of(work, struct ieee80211_local, scan_work.work);
3581 struct net_device *dev = local->scan_dev;
3582 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3583 struct ieee80211_supported_band *sband;
3584 struct ieee80211_channel *chan;
3585 int skip;
3586 unsigned long next_delay = 0;
3587
3588 if (!local->sta_sw_scanning)
3589 return;
3590
3591 switch (local->scan_state) {
3592 case SCAN_SET_CHANNEL:
3593 /*
3594 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
3595 * after we successfully scanned the last channel of the last
3596 * band (and the last band is supported by the hw)
3597 */
3598 if (local->scan_band < IEEE80211_NUM_BANDS)
3599 sband = local->hw.wiphy->bands[local->scan_band];
3600 else
3601 sband = NULL;
3602
3603 /*
3604 * If we are at an unsupported band and have more bands
3605 * left to scan, advance to the next supported one.
3606 */
3607 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
3608 local->scan_band++;
3609 sband = local->hw.wiphy->bands[local->scan_band];
3610 local->scan_channel_idx = 0;
3611 }
3612
3613 /* if no more bands/channels left, complete scan */
3614 if (!sband || local->scan_channel_idx >= sband->n_channels) {
3615 ieee80211_scan_completed(local_to_hw(local));
3616 return;
3617 }
3618 skip = 0;
3619 chan = &sband->channels[local->scan_channel_idx];
3620
3621 if (chan->flags & IEEE80211_CHAN_DISABLED ||
3622 (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3623 chan->flags & IEEE80211_CHAN_NO_IBSS))
3624 skip = 1;
3625
3626 if (!skip) {
3627 local->scan_channel = chan;
3628 if (ieee80211_hw_config(local)) {
3629 printk(KERN_DEBUG "%s: failed to set freq to "
3630 "%d MHz for scan\n", dev->name,
3631 chan->center_freq);
3632 skip = 1;
3633 }
3634 }
3635
3636 /* advance state machine to next channel/band */
3637 local->scan_channel_idx++;
3638 if (local->scan_channel_idx >= sband->n_channels) {
3639 /*
3640 * scan_band may end up == IEEE80211_NUM_BANDS, but
3641 * we'll catch that case above and complete the scan
3642 * if that is the case.
3643 */
3644 local->scan_band++;
3645 local->scan_channel_idx = 0;
3646 }
3647
3648 if (skip)
3649 break;
3650
3651 next_delay = IEEE80211_PROBE_DELAY +
3652 usecs_to_jiffies(local->hw.channel_change_time);
3653 local->scan_state = SCAN_SEND_PROBE;
3654 break;
3655 case SCAN_SEND_PROBE:
3656 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
3657 local->scan_state = SCAN_SET_CHANNEL;
3658
3659 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
3660 break;
3661 ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
3662 local->scan_ssid_len);
3663 next_delay = IEEE80211_CHANNEL_TIME;
3664 break;
3665 }
3666
3667 if (local->sta_sw_scanning)
3668 queue_delayed_work(local->hw.workqueue, &local->scan_work,
3669 next_delay);
3670 }
3671
3672
3673 static int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata,
3674 u8 *ssid, size_t ssid_len)
3675 {
3676 struct ieee80211_local *local = scan_sdata->local;
3677 struct ieee80211_sub_if_data *sdata;
3678
3679 if (ssid_len > IEEE80211_MAX_SSID_LEN)
3680 return -EINVAL;
3681
3682 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
3683 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
3684 * BSSID: MACAddress
3685 * SSID
3686 * ScanType: ACTIVE, PASSIVE
3687 * ProbeDelay: delay (in microseconds) to be used prior to transmitting
3688 * a Probe frame during active scanning
3689 * ChannelList
3690 * MinChannelTime (>= ProbeDelay), in TU
3691 * MaxChannelTime: (>= MinChannelTime), in TU
3692 */
3693
3694 /* MLME-SCAN.confirm
3695 * BSSDescriptionSet
3696 * ResultCode: SUCCESS, INVALID_PARAMETERS
3697 */
3698
3699 if (local->sta_sw_scanning || local->sta_hw_scanning) {
3700 if (local->scan_dev == scan_sdata->dev)
3701 return 0;
3702 return -EBUSY;
3703 }
3704
3705 if (local->ops->hw_scan) {
3706 int rc = local->ops->hw_scan(local_to_hw(local),
3707 ssid, ssid_len);
3708 if (!rc) {
3709 local->sta_hw_scanning = 1;
3710 local->scan_dev = scan_sdata->dev;
3711 }
3712 return rc;
3713 }
3714
3715 local->sta_sw_scanning = 1;
3716
3717 rcu_read_lock();
3718 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3719 if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
3720 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
3721 netif_tx_stop_all_queues(sdata->dev);
3722 ieee80211_send_nullfunc(local, sdata, 1);
3723 }
3724 } else
3725 netif_tx_stop_all_queues(sdata->dev);
3726 }
3727 rcu_read_unlock();
3728
3729 if (ssid) {
3730 local->scan_ssid_len = ssid_len;
3731 memcpy(local->scan_ssid, ssid, ssid_len);
3732 } else
3733 local->scan_ssid_len = 0;
3734 local->scan_state = SCAN_SET_CHANNEL;
3735 local->scan_channel_idx = 0;
3736 local->scan_band = IEEE80211_BAND_2GHZ;
3737 local->scan_dev = scan_sdata->dev;
3738
3739 netif_addr_lock_bh(local->mdev);
3740 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
3741 local->ops->configure_filter(local_to_hw(local),
3742 FIF_BCN_PRBRESP_PROMISC,
3743 &local->filter_flags,
3744 local->mdev->mc_count,
3745 local->mdev->mc_list);
3746 netif_addr_unlock_bh(local->mdev);
3747
3748 /* TODO: start scan as soon as all nullfunc frames are ACKed */
3749 queue_delayed_work(local->hw.workqueue, &local->scan_work,
3750 IEEE80211_CHANNEL_TIME);
3751
3752 return 0;
3753 }
3754
3755
3756 int ieee80211_sta_req_scan(struct ieee80211_sub_if_data *sdata, u8 *ssid, size_t ssid_len)
3757 {
3758 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3759 struct ieee80211_local *local = sdata->local;
3760
3761 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3762 return ieee80211_sta_start_scan(sdata, ssid, ssid_len);
3763
3764 if (local->sta_sw_scanning || local->sta_hw_scanning) {
3765 if (local->scan_dev == sdata->dev)
3766 return 0;
3767 return -EBUSY;
3768 }
3769
3770 ifsta->scan_ssid_len = ssid_len;
3771 if (ssid_len)
3772 memcpy(ifsta->scan_ssid, ssid, ssid_len);
3773 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
3774 queue_work(local->hw.workqueue, &ifsta->work);
3775 return 0;
3776 }
3777
3778
3779 static void ieee80211_sta_add_scan_ies(struct iw_request_info *info,
3780 struct ieee80211_sta_bss *bss,
3781 char **current_ev, char *end_buf)
3782 {
3783 u8 *pos, *end, *next;
3784 struct iw_event iwe;
3785
3786 if (bss == NULL || bss->ies == NULL)
3787 return;
3788
3789 /*
3790 * If needed, fragment the IEs buffer (at IE boundaries) into short
3791 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
3792 */
3793 pos = bss->ies;
3794 end = pos + bss->ies_len;
3795
3796 while (end - pos > IW_GENERIC_IE_MAX) {
3797 next = pos + 2 + pos[1];
3798 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
3799 next = next + 2 + next[1];
3800
3801 memset(&iwe, 0, sizeof(iwe));
3802 iwe.cmd = IWEVGENIE;
3803 iwe.u.data.length = next - pos;
3804 *current_ev = iwe_stream_add_point(info, *current_ev,
3805 end_buf, &iwe, pos);
3806
3807 pos = next;
3808 }
3809
3810 if (end > pos) {
3811 memset(&iwe, 0, sizeof(iwe));
3812 iwe.cmd = IWEVGENIE;
3813 iwe.u.data.length = end - pos;
3814 *current_ev = iwe_stream_add_point(info, *current_ev,
3815 end_buf, &iwe, pos);
3816 }
3817 }
3818
3819
3820 static char *
3821 ieee80211_sta_scan_result(struct ieee80211_local *local,
3822 struct iw_request_info *info,
3823 struct ieee80211_sta_bss *bss,
3824 char *current_ev, char *end_buf)
3825 {
3826 struct iw_event iwe;
3827
3828 if (time_after(jiffies,
3829 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
3830 return current_ev;
3831
3832 memset(&iwe, 0, sizeof(iwe));
3833 iwe.cmd = SIOCGIWAP;
3834 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
3835 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
3836 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
3837 IW_EV_ADDR_LEN);
3838
3839 memset(&iwe, 0, sizeof(iwe));
3840 iwe.cmd = SIOCGIWESSID;
3841 if (bss_mesh_cfg(bss)) {
3842 iwe.u.data.length = bss_mesh_id_len(bss);
3843 iwe.u.data.flags = 1;
3844 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
3845 &iwe, bss_mesh_id(bss));
3846 } else {
3847 iwe.u.data.length = bss->ssid_len;
3848 iwe.u.data.flags = 1;
3849 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
3850 &iwe, bss->ssid);
3851 }
3852
3853 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
3854 || bss_mesh_cfg(bss)) {
3855 memset(&iwe, 0, sizeof(iwe));
3856 iwe.cmd = SIOCGIWMODE;
3857 if (bss_mesh_cfg(bss))
3858 iwe.u.mode = IW_MODE_MESH;
3859 else if (bss->capability & WLAN_CAPABILITY_ESS)
3860 iwe.u.mode = IW_MODE_MASTER;
3861 else
3862 iwe.u.mode = IW_MODE_ADHOC;
3863 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
3864 &iwe, IW_EV_UINT_LEN);
3865 }
3866
3867 memset(&iwe, 0, sizeof(iwe));
3868 iwe.cmd = SIOCGIWFREQ;
3869 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
3870 iwe.u.freq.e = 0;
3871 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
3872 IW_EV_FREQ_LEN);
3873
3874 memset(&iwe, 0, sizeof(iwe));
3875 iwe.cmd = SIOCGIWFREQ;
3876 iwe.u.freq.m = bss->freq;
3877 iwe.u.freq.e = 6;
3878 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
3879 IW_EV_FREQ_LEN);
3880 memset(&iwe, 0, sizeof(iwe));
3881 iwe.cmd = IWEVQUAL;
3882 iwe.u.qual.qual = bss->qual;
3883 iwe.u.qual.level = bss->signal;
3884 iwe.u.qual.noise = bss->noise;
3885 iwe.u.qual.updated = local->wstats_flags;
3886 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
3887 IW_EV_QUAL_LEN);
3888
3889 memset(&iwe, 0, sizeof(iwe));
3890 iwe.cmd = SIOCGIWENCODE;
3891 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
3892 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
3893 else
3894 iwe.u.data.flags = IW_ENCODE_DISABLED;
3895 iwe.u.data.length = 0;
3896 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
3897 &iwe, "");
3898
3899 ieee80211_sta_add_scan_ies(info, bss, &current_ev, end_buf);
3900
3901 if (bss && bss->supp_rates_len > 0) {
3902 /* display all supported rates in readable format */
3903 char *p = current_ev + iwe_stream_lcp_len(info);
3904 int i;
3905
3906 memset(&iwe, 0, sizeof(iwe));
3907 iwe.cmd = SIOCGIWRATE;
3908 /* Those two flags are ignored... */
3909 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
3910
3911 for (i = 0; i < bss->supp_rates_len; i++) {
3912 iwe.u.bitrate.value = ((bss->supp_rates[i] &
3913 0x7f) * 500000);
3914 p = iwe_stream_add_value(info, current_ev, p,
3915 end_buf, &iwe, IW_EV_PARAM_LEN);
3916 }
3917 current_ev = p;
3918 }
3919
3920 if (bss) {
3921 char *buf;
3922 buf = kmalloc(30, GFP_ATOMIC);
3923 if (buf) {
3924 memset(&iwe, 0, sizeof(iwe));
3925 iwe.cmd = IWEVCUSTOM;
3926 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
3927 iwe.u.data.length = strlen(buf);
3928 current_ev = iwe_stream_add_point(info, current_ev,
3929 end_buf,
3930 &iwe, buf);
3931 memset(&iwe, 0, sizeof(iwe));
3932 iwe.cmd = IWEVCUSTOM;
3933 sprintf(buf, " Last beacon: %dms ago",
3934 jiffies_to_msecs(jiffies - bss->last_update));
3935 iwe.u.data.length = strlen(buf);
3936 current_ev = iwe_stream_add_point(info, current_ev,
3937 end_buf, &iwe, buf);
3938 kfree(buf);
3939 }
3940 }
3941
3942 if (bss_mesh_cfg(bss)) {
3943 char *buf;
3944 u8 *cfg = bss_mesh_cfg(bss);
3945 buf = kmalloc(50, GFP_ATOMIC);
3946 if (buf) {
3947 memset(&iwe, 0, sizeof(iwe));
3948 iwe.cmd = IWEVCUSTOM;
3949 sprintf(buf, "Mesh network (version %d)", cfg[0]);
3950 iwe.u.data.length = strlen(buf);
3951 current_ev = iwe_stream_add_point(info, current_ev,
3952 end_buf,
3953 &iwe, buf);
3954 sprintf(buf, "Path Selection Protocol ID: "
3955 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
3956 cfg[4]);
3957 iwe.u.data.length = strlen(buf);
3958 current_ev = iwe_stream_add_point(info, current_ev,
3959 end_buf,
3960 &iwe, buf);
3961 sprintf(buf, "Path Selection Metric ID: "
3962 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
3963 cfg[8]);
3964 iwe.u.data.length = strlen(buf);
3965 current_ev = iwe_stream_add_point(info, current_ev,
3966 end_buf,
3967 &iwe, buf);
3968 sprintf(buf, "Congestion Control Mode ID: "
3969 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
3970 cfg[11], cfg[12]);
3971 iwe.u.data.length = strlen(buf);
3972 current_ev = iwe_stream_add_point(info, current_ev,
3973 end_buf,
3974 &iwe, buf);
3975 sprintf(buf, "Channel Precedence: "
3976 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
3977 cfg[15], cfg[16]);
3978 iwe.u.data.length = strlen(buf);
3979 current_ev = iwe_stream_add_point(info, current_ev,
3980 end_buf,
3981 &iwe, buf);
3982 kfree(buf);
3983 }
3984 }
3985
3986 return current_ev;
3987 }
3988
3989
3990 int ieee80211_sta_scan_results(struct ieee80211_local *local,
3991 struct iw_request_info *info,
3992 char *buf, size_t len)
3993 {
3994 char *current_ev = buf;
3995 char *end_buf = buf + len;
3996 struct ieee80211_sta_bss *bss;
3997
3998 spin_lock_bh(&local->sta_bss_lock);
3999 list_for_each_entry(bss, &local->sta_bss_list, list) {
4000 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
4001 spin_unlock_bh(&local->sta_bss_lock);
4002 return -E2BIG;
4003 }
4004 current_ev = ieee80211_sta_scan_result(local, info, bss,
4005 current_ev, end_buf);
4006 }
4007 spin_unlock_bh(&local->sta_bss_lock);
4008 return current_ev - buf;
4009 }
4010
4011
4012 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
4013 {
4014 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4015
4016 kfree(ifsta->extra_ie);
4017 if (len == 0) {
4018 ifsta->extra_ie = NULL;
4019 ifsta->extra_ie_len = 0;
4020 return 0;
4021 }
4022 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
4023 if (!ifsta->extra_ie) {
4024 ifsta->extra_ie_len = 0;
4025 return -ENOMEM;
4026 }
4027 memcpy(ifsta->extra_ie, ie, len);
4028 ifsta->extra_ie_len = len;
4029 return 0;
4030 }
4031
4032
4033 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
4034 struct sk_buff *skb, u8 *bssid,
4035 u8 *addr, u64 supp_rates)
4036 {
4037 struct ieee80211_local *local = sdata->local;
4038 struct sta_info *sta;
4039 DECLARE_MAC_BUF(mac);
4040 int band = local->hw.conf.channel->band;
4041
4042 /* TODO: Could consider removing the least recently used entry and
4043 * allow new one to be added. */
4044 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
4045 if (net_ratelimit()) {
4046 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
4047 "entry %s\n", sdata->dev->name, print_mac(mac, addr));
4048 }
4049 return NULL;
4050 }
4051
4052 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
4053 return NULL;
4054
4055 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
4056 printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
4057 wiphy_name(local->hw.wiphy), print_mac(mac, addr), sdata->dev->name);
4058 #endif
4059
4060 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
4061 if (!sta)
4062 return NULL;
4063
4064 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
4065
4066 /* make sure mandatory rates are always added */
4067 sta->supp_rates[band] = supp_rates |
4068 ieee80211_sta_get_mandatory_rates(local, band);
4069
4070 rate_control_rate_init(sta, local);
4071
4072 if (sta_info_insert(sta))
4073 return NULL;
4074
4075 return sta;
4076 }
4077
4078
4079 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
4080 struct ieee80211_if_sta *ifsta)
4081 {
4082 struct ieee80211_local *local = sdata->local;
4083 struct ieee80211_sta_bss *bss, *selected = NULL;
4084 int top_rssi = 0, freq;
4085
4086 spin_lock_bh(&local->sta_bss_lock);
4087 freq = local->oper_channel->center_freq;
4088 list_for_each_entry(bss, &local->sta_bss_list, list) {
4089 if (!(bss->capability & WLAN_CAPABILITY_ESS))
4090 continue;
4091
4092 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
4093 IEEE80211_STA_AUTO_BSSID_SEL |
4094 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
4095 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
4096 !!sdata->default_key))
4097 continue;
4098
4099 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
4100 bss->freq != freq)
4101 continue;
4102
4103 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
4104 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
4105 continue;
4106
4107 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
4108 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
4109 continue;
4110
4111 if (!selected || top_rssi < bss->signal) {
4112 selected = bss;
4113 top_rssi = bss->signal;
4114 }
4115 }
4116 if (selected)
4117 atomic_inc(&selected->users);
4118 spin_unlock_bh(&local->sta_bss_lock);
4119
4120 if (selected) {
4121 ieee80211_set_freq(sdata, selected->freq);
4122 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
4123 ieee80211_sta_set_ssid(sdata, selected->ssid,
4124 selected->ssid_len);
4125 ieee80211_sta_set_bssid(sdata, selected->bssid);
4126 ieee80211_sta_def_wmm_params(sdata, selected, 0);
4127
4128 /* Send out direct probe if no probe resp was received or
4129 * the one we have is outdated
4130 */
4131 if (!selected->last_probe_resp ||
4132 time_after(jiffies, selected->last_probe_resp
4133 + IEEE80211_SCAN_RESULT_EXPIRE))
4134 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
4135 else
4136 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
4137
4138 ieee80211_rx_bss_put(local, selected);
4139 ieee80211_sta_reset_auth(sdata, ifsta);
4140 return 0;
4141 } else {
4142 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
4143 ifsta->assoc_scan_tries++;
4144 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
4145 ieee80211_sta_start_scan(sdata, NULL, 0);
4146 else
4147 ieee80211_sta_start_scan(sdata, ifsta->ssid,
4148 ifsta->ssid_len);
4149 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
4150 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
4151 } else
4152 ifsta->state = IEEE80211_STA_MLME_DISABLED;
4153 }
4154 return -1;
4155 }
4156
4157
4158 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
4159 {
4160 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4161
4162 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
4163 sdata->dev->name, reason);
4164
4165 if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
4166 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
4167 return -EINVAL;
4168
4169 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
4170 return 0;
4171 }
4172
4173
4174 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
4175 {
4176 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4177
4178 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
4179 sdata->dev->name, reason);
4180
4181 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4182 return -EINVAL;
4183
4184 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
4185 return -1;
4186
4187 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
4188 return 0;
4189 }
4190
4191 void ieee80211_notify_mac(struct ieee80211_hw *hw,
4192 enum ieee80211_notification_types notif_type)
4193 {
4194 struct ieee80211_local *local = hw_to_local(hw);
4195 struct ieee80211_sub_if_data *sdata;
4196
4197 switch (notif_type) {
4198 case IEEE80211_NOTIFY_RE_ASSOC:
4199 rcu_read_lock();
4200 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4201 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4202 continue;
4203
4204 ieee80211_sta_req_auth(sdata, &sdata->u.sta);
4205 }
4206 rcu_read_unlock();
4207 break;
4208 }
4209 }
4210 EXPORT_SYMBOL(ieee80211_notify_mac);
4211
4212 void ieee80211_sta_work(struct work_struct *work)
4213 {
4214 struct ieee80211_sub_if_data *sdata =
4215 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
4216 struct ieee80211_local *local = sdata->local;
4217 struct ieee80211_if_sta *ifsta;
4218 struct sk_buff *skb;
4219
4220 if (!netif_running(sdata->dev))
4221 return;
4222
4223 if (local->sta_sw_scanning || local->sta_hw_scanning)
4224 return;
4225
4226 if (WARN_ON(sdata->vif.type != IEEE80211_IF_TYPE_STA &&
4227 sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
4228 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
4229 return;
4230 ifsta = &sdata->u.sta;
4231
4232 while ((skb = skb_dequeue(&ifsta->skb_queue)))
4233 ieee80211_sta_rx_queued_mgmt(sdata, skb);
4234
4235 #ifdef CONFIG_MAC80211_MESH
4236 if (ifsta->preq_queue_len &&
4237 time_after(jiffies,
4238 ifsta->last_preq + msecs_to_jiffies(ifsta->mshcfg.dot11MeshHWMPpreqMinInterval)))
4239 mesh_path_start_discovery(sdata);
4240 #endif
4241
4242 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
4243 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
4244 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
4245 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
4246 if (ifsta->scan_ssid_len)
4247 ieee80211_sta_start_scan(sdata, ifsta->scan_ssid, ifsta->scan_ssid_len);
4248 else
4249 ieee80211_sta_start_scan(sdata, NULL, 0);
4250 return;
4251 }
4252
4253 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
4254 if (ieee80211_sta_config_auth(sdata, ifsta))
4255 return;
4256 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
4257 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
4258 return;
4259
4260 switch (ifsta->state) {
4261 case IEEE80211_STA_MLME_DISABLED:
4262 break;
4263 case IEEE80211_STA_MLME_DIRECT_PROBE:
4264 ieee80211_direct_probe(sdata, ifsta);
4265 break;
4266 case IEEE80211_STA_MLME_AUTHENTICATE:
4267 ieee80211_authenticate(sdata, ifsta);
4268 break;
4269 case IEEE80211_STA_MLME_ASSOCIATE:
4270 ieee80211_associate(sdata, ifsta);
4271 break;
4272 case IEEE80211_STA_MLME_ASSOCIATED:
4273 ieee80211_associated(sdata, ifsta);
4274 break;
4275 case IEEE80211_STA_MLME_IBSS_SEARCH:
4276 ieee80211_sta_find_ibss(sdata, ifsta);
4277 break;
4278 case IEEE80211_STA_MLME_IBSS_JOINED:
4279 ieee80211_sta_merge_ibss(sdata, ifsta);
4280 break;
4281 #ifdef CONFIG_MAC80211_MESH
4282 case IEEE80211_STA_MLME_MESH_UP:
4283 ieee80211_mesh_housekeeping(sdata, ifsta);
4284 break;
4285 #endif
4286 default:
4287 WARN_ON(1);
4288 break;
4289 }
4290
4291 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
4292 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
4293 "mixed-cell disabled - disassociate\n", sdata->dev->name);
4294
4295 ieee80211_set_disassoc(sdata, ifsta, false, true,
4296 WLAN_REASON_UNSPECIFIED);
4297 }
4298 }
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