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[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 /* 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 <asm/types.h>
30
31 #include <net/mac80211.h>
32 #include "ieee80211_i.h"
33 #include "rate.h"
34 #include "led.h"
35 #include "mesh.h"
36
37 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
38 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
39 #define IEEE80211_AUTH_MAX_TRIES 3
40 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
41 #define IEEE80211_ASSOC_MAX_TRIES 3
42 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
43 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
44 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
45 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
46 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
47 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
48 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
49
50 #define IEEE80211_PROBE_DELAY (HZ / 33)
51 #define IEEE80211_CHANNEL_TIME (HZ / 33)
52 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
53 #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
54 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
55 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
56 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
57
58 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
59
60
61 #define ERP_INFO_USE_PROTECTION BIT(1)
62
63 /* mgmt header + 1 byte category code */
64 #define IEEE80211_MIN_ACTION_SIZE (24 + 1)
65
66 #define IEEE80211_ADDBA_PARAM_POLICY_MASK 0x0002
67 #define IEEE80211_ADDBA_PARAM_TID_MASK 0x003C
68 #define IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK 0xFFA0
69 #define IEEE80211_DELBA_PARAM_TID_MASK 0xF000
70 #define IEEE80211_DELBA_PARAM_INITIATOR_MASK 0x0800
71
72 /* next values represent the buffer size for A-MPDU frame.
73 * According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2) */
74 #define IEEE80211_MIN_AMPDU_BUF 0x8
75 #define IEEE80211_MAX_AMPDU_BUF 0x40
76
77 static void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
78 u8 *ssid, size_t ssid_len);
79 static struct ieee80211_sta_bss *
80 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
81 u8 *ssid, u8 ssid_len);
82 static void ieee80211_rx_bss_put(struct ieee80211_local *local,
83 struct ieee80211_sta_bss *bss);
84 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
85 struct ieee80211_if_sta *ifsta);
86 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata);
87 static int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *sdata,
88 u8 *ssid, size_t ssid_len);
89 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
90 struct ieee80211_if_sta *ifsta);
91 static void sta_rx_agg_session_timer_expired(unsigned long data);
92
93
94 static u8 * ieee80211_bss_get_ie(struct ieee80211_sta_bss *bss, u8 ie)
95 {
96 u8 *end, *pos;
97
98 pos = bss->ies;
99 if (pos == NULL)
100 return NULL;
101 end = pos + bss->ies_len;
102
103 while (pos + 1 < end) {
104 if (pos + 2 + pos[1] > end)
105 break;
106 if (pos[0] == ie)
107 return pos;
108 pos += 2 + pos[1];
109 }
110
111 return NULL;
112 }
113
114
115 static int ecw2cw(int ecw)
116 {
117 return (1 << ecw) - 1;
118 }
119
120
121 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
122 struct ieee80211_sta_bss *bss,
123 int ibss)
124 {
125 struct ieee80211_local *local = sdata->local;
126 int i, have_higher_than_11mbit = 0;
127
128
129 /* cf. IEEE 802.11 9.2.12 */
130 for (i = 0; i < bss->supp_rates_len; i++)
131 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
132 have_higher_than_11mbit = 1;
133
134 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
135 have_higher_than_11mbit)
136 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
137 else
138 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
139
140
141 if (local->ops->conf_tx) {
142 struct ieee80211_tx_queue_params qparam;
143
144 memset(&qparam, 0, sizeof(qparam));
145
146 qparam.aifs = 2;
147
148 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
149 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
150 qparam.cw_min = 31;
151 else
152 qparam.cw_min = 15;
153
154 qparam.cw_max = 1023;
155 qparam.txop = 0;
156
157 for (i = 0; i < local_to_hw(local)->queues; i++)
158 local->ops->conf_tx(local_to_hw(local), i, &qparam);
159 }
160 }
161
162 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
163 struct ieee80211_if_sta *ifsta,
164 u8 *wmm_param, size_t wmm_param_len)
165 {
166 struct ieee80211_tx_queue_params params;
167 size_t left;
168 int count;
169 u8 *pos;
170
171 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
172 return;
173
174 if (!wmm_param)
175 return;
176
177 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
178 return;
179 count = wmm_param[6] & 0x0f;
180 if (count == ifsta->wmm_last_param_set)
181 return;
182 ifsta->wmm_last_param_set = count;
183
184 pos = wmm_param + 8;
185 left = wmm_param_len - 8;
186
187 memset(&params, 0, sizeof(params));
188
189 if (!local->ops->conf_tx)
190 return;
191
192 local->wmm_acm = 0;
193 for (; left >= 4; left -= 4, pos += 4) {
194 int aci = (pos[0] >> 5) & 0x03;
195 int acm = (pos[0] >> 4) & 0x01;
196 int queue;
197
198 switch (aci) {
199 case 1:
200 queue = 3;
201 if (acm)
202 local->wmm_acm |= BIT(0) | BIT(3);
203 break;
204 case 2:
205 queue = 1;
206 if (acm)
207 local->wmm_acm |= BIT(4) | BIT(5);
208 break;
209 case 3:
210 queue = 0;
211 if (acm)
212 local->wmm_acm |= BIT(6) | BIT(7);
213 break;
214 case 0:
215 default:
216 queue = 2;
217 if (acm)
218 local->wmm_acm |= BIT(1) | BIT(2);
219 break;
220 }
221
222 params.aifs = pos[0] & 0x0f;
223 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
224 params.cw_min = ecw2cw(pos[1] & 0x0f);
225 params.txop = get_unaligned_le16(pos + 2);
226 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
227 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
228 "cWmin=%d cWmax=%d txop=%d\n",
229 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
230 params.cw_max, params.txop);
231 #endif
232 /* TODO: handle ACM (block TX, fallback to next lowest allowed
233 * AC for now) */
234 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
235 printk(KERN_DEBUG "%s: failed to set TX queue "
236 "parameters for queue %d\n", local->mdev->name, queue);
237 }
238 }
239 }
240
241 static u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
242 bool use_protection,
243 bool use_short_preamble)
244 {
245 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
246 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
247 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
248 DECLARE_MAC_BUF(mac);
249 #endif
250 u32 changed = 0;
251
252 if (use_protection != bss_conf->use_cts_prot) {
253 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
254 if (net_ratelimit()) {
255 printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
256 "%s)\n",
257 sdata->dev->name,
258 use_protection ? "enabled" : "disabled",
259 print_mac(mac, ifsta->bssid));
260 }
261 #endif
262 bss_conf->use_cts_prot = use_protection;
263 changed |= BSS_CHANGED_ERP_CTS_PROT;
264 }
265
266 if (use_short_preamble != bss_conf->use_short_preamble) {
267 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
268 if (net_ratelimit()) {
269 printk(KERN_DEBUG "%s: switched to %s barker preamble"
270 " (BSSID=%s)\n",
271 sdata->dev->name,
272 use_short_preamble ? "short" : "long",
273 print_mac(mac, ifsta->bssid));
274 }
275 #endif
276 bss_conf->use_short_preamble = use_short_preamble;
277 changed |= BSS_CHANGED_ERP_PREAMBLE;
278 }
279
280 return changed;
281 }
282
283 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
284 u8 erp_value)
285 {
286 bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
287 bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
288
289 return ieee80211_handle_protect_preamb(sdata,
290 use_protection, use_short_preamble);
291 }
292
293 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
294 struct ieee80211_sta_bss *bss)
295 {
296 u32 changed = 0;
297
298 if (bss->has_erp_value)
299 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
300 else {
301 u16 capab = bss->capability;
302 changed |= ieee80211_handle_protect_preamb(sdata, false,
303 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
304 }
305
306 return changed;
307 }
308
309 int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
310 struct ieee80211_ht_info *ht_info)
311 {
312
313 if (ht_info == NULL)
314 return -EINVAL;
315
316 memset(ht_info, 0, sizeof(*ht_info));
317
318 if (ht_cap_ie) {
319 u8 ampdu_info = ht_cap_ie->ampdu_params_info;
320
321 ht_info->ht_supported = 1;
322 ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
323 ht_info->ampdu_factor =
324 ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
325 ht_info->ampdu_density =
326 (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
327 memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
328 } else
329 ht_info->ht_supported = 0;
330
331 return 0;
332 }
333
334 int ieee80211_ht_addt_info_ie_to_ht_bss_info(
335 struct ieee80211_ht_addt_info *ht_add_info_ie,
336 struct ieee80211_ht_bss_info *bss_info)
337 {
338 if (bss_info == NULL)
339 return -EINVAL;
340
341 memset(bss_info, 0, sizeof(*bss_info));
342
343 if (ht_add_info_ie) {
344 u16 op_mode;
345 op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);
346
347 bss_info->primary_channel = ht_add_info_ie->control_chan;
348 bss_info->bss_cap = ht_add_info_ie->ht_param;
349 bss_info->bss_op_mode = (u8)(op_mode & 0xff);
350 }
351
352 return 0;
353 }
354
355 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
356 struct ieee80211_if_sta *ifsta)
357 {
358 union iwreq_data wrqu;
359
360 if (ifsta->assocreq_ies) {
361 memset(&wrqu, 0, sizeof(wrqu));
362 wrqu.data.length = ifsta->assocreq_ies_len;
363 wireless_send_event(sdata->dev, IWEVASSOCREQIE, &wrqu,
364 ifsta->assocreq_ies);
365 }
366 if (ifsta->assocresp_ies) {
367 memset(&wrqu, 0, sizeof(wrqu));
368 wrqu.data.length = ifsta->assocresp_ies_len;
369 wireless_send_event(sdata->dev, IWEVASSOCRESPIE, &wrqu,
370 ifsta->assocresp_ies);
371 }
372 }
373
374
375 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
376 struct ieee80211_if_sta *ifsta,
377 bool assoc)
378 {
379 struct ieee80211_local *local = sdata->local;
380 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
381 union iwreq_data wrqu;
382 u32 changed = BSS_CHANGED_ASSOC;
383
384 if (assoc) {
385 struct ieee80211_sta_bss *bss;
386
387 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
388
389 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
390 return;
391
392 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
393 conf->channel->center_freq,
394 ifsta->ssid, ifsta->ssid_len);
395 if (bss) {
396 /* set timing information */
397 sdata->bss_conf.beacon_int = bss->beacon_int;
398 sdata->bss_conf.timestamp = bss->timestamp;
399 sdata->bss_conf.dtim_period = bss->dtim_period;
400
401 changed |= ieee80211_handle_bss_capability(sdata, bss);
402
403 ieee80211_rx_bss_put(local, bss);
404 }
405
406 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
407 changed |= BSS_CHANGED_HT;
408 sdata->bss_conf.assoc_ht = 1;
409 sdata->bss_conf.ht_conf = &conf->ht_conf;
410 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
411 }
412
413 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
414 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
415 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
416 ieee80211_sta_send_associnfo(sdata, ifsta);
417 } else {
418 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
419 changed |= ieee80211_reset_erp_info(sdata);
420
421 sdata->bss_conf.assoc_ht = 0;
422 sdata->bss_conf.ht_conf = NULL;
423 sdata->bss_conf.ht_bss_conf = NULL;
424
425 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
426 }
427 ifsta->last_probe = jiffies;
428 ieee80211_led_assoc(local, assoc);
429
430 sdata->bss_conf.assoc = assoc;
431 ieee80211_bss_info_change_notify(sdata, changed);
432
433 if (assoc)
434 netif_carrier_on(sdata->dev);
435
436 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
437 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
438 }
439
440 void ieee80211_sta_tx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
441 int encrypt)
442 {
443 skb->dev = sdata->local->mdev;
444 skb_set_mac_header(skb, 0);
445 skb_set_network_header(skb, 0);
446 skb_set_transport_header(skb, 0);
447
448 skb->iif = sdata->dev->ifindex;
449 skb->do_not_encrypt = !encrypt;
450
451 dev_queue_xmit(skb);
452 }
453
454
455 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
456 struct ieee80211_if_sta *ifsta,
457 int transaction, u8 *extra, size_t extra_len,
458 int encrypt)
459 {
460 struct ieee80211_local *local = sdata->local;
461 struct sk_buff *skb;
462 struct ieee80211_mgmt *mgmt;
463
464 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
465 sizeof(*mgmt) + 6 + extra_len);
466 if (!skb) {
467 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
468 "frame\n", sdata->dev->name);
469 return;
470 }
471 skb_reserve(skb, local->hw.extra_tx_headroom);
472
473 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
474 memset(mgmt, 0, 24 + 6);
475 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
476 IEEE80211_STYPE_AUTH);
477 if (encrypt)
478 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
479 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
480 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
481 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
482 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
483 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
484 ifsta->auth_transaction = transaction + 1;
485 mgmt->u.auth.status_code = cpu_to_le16(0);
486 if (extra)
487 memcpy(skb_put(skb, extra_len), extra, extra_len);
488
489 ieee80211_sta_tx(sdata, skb, encrypt);
490 }
491
492 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
493 struct ieee80211_if_sta *ifsta)
494 {
495 DECLARE_MAC_BUF(mac);
496
497 ifsta->direct_probe_tries++;
498 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
499 printk(KERN_DEBUG "%s: direct probe to AP %s timed out\n",
500 sdata->dev->name, print_mac(mac, ifsta->bssid));
501 ifsta->state = IEEE80211_STA_MLME_DISABLED;
502 return;
503 }
504
505 printk(KERN_DEBUG "%s: direct probe to AP %s try %d\n",
506 sdata->dev->name, print_mac(mac, ifsta->bssid),
507 ifsta->direct_probe_tries);
508
509 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
510
511 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
512
513 /* Direct probe is sent to broadcast address as some APs
514 * will not answer to direct packet in unassociated state.
515 */
516 ieee80211_send_probe_req(sdata, NULL,
517 ifsta->ssid, ifsta->ssid_len);
518
519 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
520 }
521
522
523 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
524 struct ieee80211_if_sta *ifsta)
525 {
526 DECLARE_MAC_BUF(mac);
527
528 ifsta->auth_tries++;
529 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
530 printk(KERN_DEBUG "%s: authentication with AP %s"
531 " timed out\n",
532 sdata->dev->name, print_mac(mac, ifsta->bssid));
533 ifsta->state = IEEE80211_STA_MLME_DISABLED;
534 return;
535 }
536
537 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
538 printk(KERN_DEBUG "%s: authenticate with AP %s\n",
539 sdata->dev->name, print_mac(mac, ifsta->bssid));
540
541 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
542
543 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
544 }
545
546 static int ieee80211_compatible_rates(struct ieee80211_sta_bss *bss,
547 struct ieee80211_supported_band *sband,
548 u64 *rates)
549 {
550 int i, j, count;
551 *rates = 0;
552 count = 0;
553 for (i = 0; i < bss->supp_rates_len; i++) {
554 int rate = (bss->supp_rates[i] & 0x7F) * 5;
555
556 for (j = 0; j < sband->n_bitrates; j++)
557 if (sband->bitrates[j].bitrate == rate) {
558 *rates |= BIT(j);
559 count++;
560 break;
561 }
562 }
563
564 return count;
565 }
566
567 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
568 struct ieee80211_if_sta *ifsta)
569 {
570 struct ieee80211_local *local = sdata->local;
571 struct sk_buff *skb;
572 struct ieee80211_mgmt *mgmt;
573 u8 *pos, *ies, *ht_add_ie;
574 int i, len, count, rates_len, supp_rates_len;
575 u16 capab;
576 struct ieee80211_sta_bss *bss;
577 int wmm = 0;
578 struct ieee80211_supported_band *sband;
579 u64 rates = 0;
580
581 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
582 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
583 ifsta->ssid_len);
584 if (!skb) {
585 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
586 "frame\n", sdata->dev->name);
587 return;
588 }
589 skb_reserve(skb, local->hw.extra_tx_headroom);
590
591 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
592
593 capab = ifsta->capab;
594
595 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
596 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
597 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
598 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
599 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
600 }
601
602 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
603 local->hw.conf.channel->center_freq,
604 ifsta->ssid, ifsta->ssid_len);
605 if (bss) {
606 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
607 capab |= WLAN_CAPABILITY_PRIVACY;
608 if (bss->wmm_used)
609 wmm = 1;
610
611 /* get all rates supported by the device and the AP as
612 * some APs don't like getting a superset of their rates
613 * in the association request (e.g. D-Link DAP 1353 in
614 * b-only mode) */
615 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
616
617 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
618 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
619 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
620
621 ieee80211_rx_bss_put(local, bss);
622 } else {
623 rates = ~0;
624 rates_len = sband->n_bitrates;
625 }
626
627 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
628 memset(mgmt, 0, 24);
629 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
630 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
631 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
632
633 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
634 skb_put(skb, 10);
635 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
636 IEEE80211_STYPE_REASSOC_REQ);
637 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
638 mgmt->u.reassoc_req.listen_interval =
639 cpu_to_le16(local->hw.conf.listen_interval);
640 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
641 ETH_ALEN);
642 } else {
643 skb_put(skb, 4);
644 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
645 IEEE80211_STYPE_ASSOC_REQ);
646 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
647 mgmt->u.reassoc_req.listen_interval =
648 cpu_to_le16(local->hw.conf.listen_interval);
649 }
650
651 /* SSID */
652 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
653 *pos++ = WLAN_EID_SSID;
654 *pos++ = ifsta->ssid_len;
655 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
656
657 /* add all rates which were marked to be used above */
658 supp_rates_len = rates_len;
659 if (supp_rates_len > 8)
660 supp_rates_len = 8;
661
662 len = sband->n_bitrates;
663 pos = skb_put(skb, supp_rates_len + 2);
664 *pos++ = WLAN_EID_SUPP_RATES;
665 *pos++ = supp_rates_len;
666
667 count = 0;
668 for (i = 0; i < sband->n_bitrates; i++) {
669 if (BIT(i) & rates) {
670 int rate = sband->bitrates[i].bitrate;
671 *pos++ = (u8) (rate / 5);
672 if (++count == 8)
673 break;
674 }
675 }
676
677 if (rates_len > count) {
678 pos = skb_put(skb, rates_len - count + 2);
679 *pos++ = WLAN_EID_EXT_SUPP_RATES;
680 *pos++ = rates_len - count;
681
682 for (i++; i < sband->n_bitrates; i++) {
683 if (BIT(i) & rates) {
684 int rate = sband->bitrates[i].bitrate;
685 *pos++ = (u8) (rate / 5);
686 }
687 }
688 }
689
690 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
691 /* 1. power capabilities */
692 pos = skb_put(skb, 4);
693 *pos++ = WLAN_EID_PWR_CAPABILITY;
694 *pos++ = 2;
695 *pos++ = 0; /* min tx power */
696 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
697
698 /* 2. supported channels */
699 /* TODO: get this in reg domain format */
700 pos = skb_put(skb, 2 * sband->n_channels + 2);
701 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
702 *pos++ = 2 * sband->n_channels;
703 for (i = 0; i < sband->n_channels; i++) {
704 *pos++ = ieee80211_frequency_to_channel(
705 sband->channels[i].center_freq);
706 *pos++ = 1; /* one channel in the subband*/
707 }
708 }
709
710 if (ifsta->extra_ie) {
711 pos = skb_put(skb, ifsta->extra_ie_len);
712 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
713 }
714
715 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
716 pos = skb_put(skb, 9);
717 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
718 *pos++ = 7; /* len */
719 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
720 *pos++ = 0x50;
721 *pos++ = 0xf2;
722 *pos++ = 2; /* WME */
723 *pos++ = 0; /* WME info */
724 *pos++ = 1; /* WME ver */
725 *pos++ = 0;
726 }
727
728 /* wmm support is a must to HT */
729 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
730 sband->ht_info.ht_supported &&
731 (ht_add_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_EXTRA_INFO))) {
732 struct ieee80211_ht_addt_info *ht_add_info =
733 (struct ieee80211_ht_addt_info *)ht_add_ie;
734 u16 cap = sband->ht_info.cap;
735 __le16 tmp;
736 u32 flags = local->hw.conf.channel->flags;
737
738 switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
739 case IEEE80211_HT_IE_CHA_SEC_ABOVE:
740 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
741 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
742 cap &= ~IEEE80211_HT_CAP_SGI_40;
743 }
744 break;
745 case IEEE80211_HT_IE_CHA_SEC_BELOW:
746 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
747 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
748 cap &= ~IEEE80211_HT_CAP_SGI_40;
749 }
750 break;
751 }
752
753 tmp = cpu_to_le16(cap);
754 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
755 *pos++ = WLAN_EID_HT_CAPABILITY;
756 *pos++ = sizeof(struct ieee80211_ht_cap);
757 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
758 memcpy(pos, &tmp, sizeof(u16));
759 pos += sizeof(u16);
760 /* TODO: needs a define here for << 2 */
761 *pos++ = sband->ht_info.ampdu_factor |
762 (sband->ht_info.ampdu_density << 2);
763 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
764 }
765
766 kfree(ifsta->assocreq_ies);
767 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
768 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
769 if (ifsta->assocreq_ies)
770 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
771
772 ieee80211_sta_tx(sdata, skb, 0);
773 }
774
775
776 static void ieee80211_send_deauth(struct ieee80211_sub_if_data *sdata,
777 struct ieee80211_if_sta *ifsta, u16 reason)
778 {
779 struct ieee80211_local *local = sdata->local;
780 struct sk_buff *skb;
781 struct ieee80211_mgmt *mgmt;
782
783 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
784 if (!skb) {
785 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
786 "frame\n", sdata->dev->name);
787 return;
788 }
789 skb_reserve(skb, local->hw.extra_tx_headroom);
790
791 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
792 memset(mgmt, 0, 24);
793 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
794 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
795 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
796 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
797 IEEE80211_STYPE_DEAUTH);
798 skb_put(skb, 2);
799 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
800
801 ieee80211_sta_tx(sdata, skb, 0);
802 }
803
804
805 static void ieee80211_send_disassoc(struct ieee80211_sub_if_data *sdata,
806 struct ieee80211_if_sta *ifsta, u16 reason)
807 {
808 struct ieee80211_local *local = sdata->local;
809 struct sk_buff *skb;
810 struct ieee80211_mgmt *mgmt;
811
812 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
813 if (!skb) {
814 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
815 "frame\n", sdata->dev->name);
816 return;
817 }
818 skb_reserve(skb, local->hw.extra_tx_headroom);
819
820 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
821 memset(mgmt, 0, 24);
822 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
823 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
824 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
825 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
826 IEEE80211_STYPE_DISASSOC);
827 skb_put(skb, 2);
828 mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
829
830 ieee80211_sta_tx(sdata, skb, 0);
831 }
832
833 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
834 struct ieee80211_if_sta *ifsta, bool deauth,
835 bool self_disconnected, u16 reason)
836 {
837 struct ieee80211_local *local = sdata->local;
838 struct sta_info *sta;
839
840 rcu_read_lock();
841
842 sta = sta_info_get(local, ifsta->bssid);
843 if (!sta) {
844 rcu_read_unlock();
845 return;
846 }
847
848 if (deauth) {
849 ifsta->direct_probe_tries = 0;
850 ifsta->auth_tries = 0;
851 }
852 ifsta->assoc_scan_tries = 0;
853 ifsta->assoc_tries = 0;
854
855 netif_carrier_off(sdata->dev);
856
857 ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);
858
859 if (self_disconnected) {
860 if (deauth)
861 ieee80211_send_deauth(sdata, ifsta, reason);
862 else
863 ieee80211_send_disassoc(sdata, ifsta, reason);
864 }
865
866 ieee80211_set_associated(sdata, ifsta, 0);
867
868 if (self_disconnected)
869 ifsta->state = IEEE80211_STA_MLME_DISABLED;
870
871 sta_info_unlink(&sta);
872
873 rcu_read_unlock();
874
875 sta_info_destroy(sta);
876 }
877
878 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
879 struct ieee80211_if_sta *ifsta)
880 {
881 struct ieee80211_local *local = sdata->local;
882 struct ieee80211_sta_bss *bss;
883 int bss_privacy;
884 int wep_privacy;
885 int privacy_invoked;
886
887 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
888 return 0;
889
890 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
891 local->hw.conf.channel->center_freq,
892 ifsta->ssid, ifsta->ssid_len);
893 if (!bss)
894 return 0;
895
896 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
897 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
898 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
899
900 ieee80211_rx_bss_put(local, bss);
901
902 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
903 return 0;
904
905 return 1;
906 }
907
908
909 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
910 struct ieee80211_if_sta *ifsta)
911 {
912 DECLARE_MAC_BUF(mac);
913
914 ifsta->assoc_tries++;
915 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
916 printk(KERN_DEBUG "%s: association with AP %s"
917 " timed out\n",
918 sdata->dev->name, print_mac(mac, ifsta->bssid));
919 ifsta->state = IEEE80211_STA_MLME_DISABLED;
920 return;
921 }
922
923 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
924 printk(KERN_DEBUG "%s: associate with AP %s\n",
925 sdata->dev->name, print_mac(mac, ifsta->bssid));
926 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
927 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
928 "mixed-cell disabled - abort association\n", sdata->dev->name);
929 ifsta->state = IEEE80211_STA_MLME_DISABLED;
930 return;
931 }
932
933 ieee80211_send_assoc(sdata, ifsta);
934
935 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
936 }
937
938
939 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
940 struct ieee80211_if_sta *ifsta)
941 {
942 struct ieee80211_local *local = sdata->local;
943 struct sta_info *sta;
944 int disassoc;
945 DECLARE_MAC_BUF(mac);
946
947 /* TODO: start monitoring current AP signal quality and number of
948 * missed beacons. Scan other channels every now and then and search
949 * for better APs. */
950 /* TODO: remove expired BSSes */
951
952 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
953
954 rcu_read_lock();
955
956 sta = sta_info_get(local, ifsta->bssid);
957 if (!sta) {
958 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
959 sdata->dev->name, print_mac(mac, ifsta->bssid));
960 disassoc = 1;
961 } else {
962 disassoc = 0;
963 if (time_after(jiffies,
964 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
965 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
966 printk(KERN_DEBUG "%s: No ProbeResp from "
967 "current AP %s - assume out of "
968 "range\n",
969 sdata->dev->name, print_mac(mac, ifsta->bssid));
970 disassoc = 1;
971 } else
972 ieee80211_send_probe_req(sdata, ifsta->bssid,
973 local->scan_ssid,
974 local->scan_ssid_len);
975 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
976 } else {
977 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
978 if (time_after(jiffies, ifsta->last_probe +
979 IEEE80211_PROBE_INTERVAL)) {
980 ifsta->last_probe = jiffies;
981 ieee80211_send_probe_req(sdata, ifsta->bssid,
982 ifsta->ssid,
983 ifsta->ssid_len);
984 }
985 }
986 }
987
988 rcu_read_unlock();
989
990 if (disassoc)
991 ieee80211_set_disassoc(sdata, ifsta, true, true,
992 WLAN_REASON_PREV_AUTH_NOT_VALID);
993 else
994 mod_timer(&ifsta->timer, jiffies +
995 IEEE80211_MONITORING_INTERVAL);
996 }
997
998
999 static void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1000 u8 *ssid, size_t ssid_len)
1001 {
1002 struct ieee80211_local *local = sdata->local;
1003 struct ieee80211_supported_band *sband;
1004 struct sk_buff *skb;
1005 struct ieee80211_mgmt *mgmt;
1006 u8 *pos, *supp_rates, *esupp_rates = NULL;
1007 int i;
1008
1009 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
1010 if (!skb) {
1011 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1012 "request\n", sdata->dev->name);
1013 return;
1014 }
1015 skb_reserve(skb, local->hw.extra_tx_headroom);
1016
1017 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1018 memset(mgmt, 0, 24);
1019 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1020 IEEE80211_STYPE_PROBE_REQ);
1021 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1022 if (dst) {
1023 memcpy(mgmt->da, dst, ETH_ALEN);
1024 memcpy(mgmt->bssid, dst, ETH_ALEN);
1025 } else {
1026 memset(mgmt->da, 0xff, ETH_ALEN);
1027 memset(mgmt->bssid, 0xff, ETH_ALEN);
1028 }
1029 pos = skb_put(skb, 2 + ssid_len);
1030 *pos++ = WLAN_EID_SSID;
1031 *pos++ = ssid_len;
1032 memcpy(pos, ssid, ssid_len);
1033
1034 supp_rates = skb_put(skb, 2);
1035 supp_rates[0] = WLAN_EID_SUPP_RATES;
1036 supp_rates[1] = 0;
1037 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1038
1039 for (i = 0; i < sband->n_bitrates; i++) {
1040 struct ieee80211_rate *rate = &sband->bitrates[i];
1041 if (esupp_rates) {
1042 pos = skb_put(skb, 1);
1043 esupp_rates[1]++;
1044 } else if (supp_rates[1] == 8) {
1045 esupp_rates = skb_put(skb, 3);
1046 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
1047 esupp_rates[1] = 1;
1048 pos = &esupp_rates[2];
1049 } else {
1050 pos = skb_put(skb, 1);
1051 supp_rates[1]++;
1052 }
1053 *pos = rate->bitrate / 5;
1054 }
1055
1056 ieee80211_sta_tx(sdata, skb, 0);
1057 }
1058
1059
1060 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1061 {
1062 if (!sdata || !sdata->default_key ||
1063 sdata->default_key->conf.alg != ALG_WEP)
1064 return 0;
1065 return 1;
1066 }
1067
1068
1069 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1070 struct ieee80211_if_sta *ifsta)
1071 {
1072 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1073 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1074 ieee80211_associate(sdata, ifsta);
1075 }
1076
1077
1078 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1079 struct ieee80211_if_sta *ifsta,
1080 struct ieee80211_mgmt *mgmt,
1081 size_t len)
1082 {
1083 u8 *pos;
1084 struct ieee802_11_elems elems;
1085
1086 pos = mgmt->u.auth.variable;
1087 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1088 if (!elems.challenge)
1089 return;
1090 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1091 elems.challenge_len + 2, 1);
1092 }
1093
1094 static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
1095 u8 dialog_token, u16 status, u16 policy,
1096 u16 buf_size, u16 timeout)
1097 {
1098 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1099 struct ieee80211_local *local = sdata->local;
1100 struct sk_buff *skb;
1101 struct ieee80211_mgmt *mgmt;
1102 u16 capab;
1103
1104 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1105
1106 if (!skb) {
1107 printk(KERN_DEBUG "%s: failed to allocate buffer "
1108 "for addba resp frame\n", sdata->dev->name);
1109 return;
1110 }
1111
1112 skb_reserve(skb, local->hw.extra_tx_headroom);
1113 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1114 memset(mgmt, 0, 24);
1115 memcpy(mgmt->da, da, ETH_ALEN);
1116 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1117 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1118 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1119 else
1120 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1121 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1122 IEEE80211_STYPE_ACTION);
1123
1124 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
1125 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1126 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
1127 mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
1128
1129 capab = (u16)(policy << 1); /* bit 1 aggregation policy */
1130 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1131 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
1132
1133 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
1134 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
1135 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
1136
1137 ieee80211_sta_tx(sdata, skb, 0);
1138
1139 return;
1140 }
1141
1142 void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, const u8 *da,
1143 u16 tid, u8 dialog_token, u16 start_seq_num,
1144 u16 agg_size, u16 timeout)
1145 {
1146 struct ieee80211_local *local = sdata->local;
1147 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1148 struct sk_buff *skb;
1149 struct ieee80211_mgmt *mgmt;
1150 u16 capab;
1151
1152 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1153
1154 if (!skb) {
1155 printk(KERN_ERR "%s: failed to allocate buffer "
1156 "for addba request frame\n", sdata->dev->name);
1157 return;
1158 }
1159 skb_reserve(skb, local->hw.extra_tx_headroom);
1160 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1161 memset(mgmt, 0, 24);
1162 memcpy(mgmt->da, da, ETH_ALEN);
1163 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1164 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1165 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1166 else
1167 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1168
1169 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1170 IEEE80211_STYPE_ACTION);
1171
1172 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
1173
1174 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1175 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
1176
1177 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
1178 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
1179 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1180 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
1181
1182 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
1183
1184 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
1185 mgmt->u.action.u.addba_req.start_seq_num =
1186 cpu_to_le16(start_seq_num << 4);
1187
1188 ieee80211_sta_tx(sdata, skb, 0);
1189 }
1190
1191 static void ieee80211_sta_process_addba_request(struct ieee80211_local *local,
1192 struct ieee80211_mgmt *mgmt,
1193 size_t len)
1194 {
1195 struct ieee80211_hw *hw = &local->hw;
1196 struct ieee80211_conf *conf = &hw->conf;
1197 struct sta_info *sta;
1198 struct tid_ampdu_rx *tid_agg_rx;
1199 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
1200 u8 dialog_token;
1201 int ret = -EOPNOTSUPP;
1202 DECLARE_MAC_BUF(mac);
1203
1204 rcu_read_lock();
1205
1206 sta = sta_info_get(local, mgmt->sa);
1207 if (!sta) {
1208 rcu_read_unlock();
1209 return;
1210 }
1211
1212 /* extract session parameters from addba request frame */
1213 dialog_token = mgmt->u.action.u.addba_req.dialog_token;
1214 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
1215 start_seq_num =
1216 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
1217
1218 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
1219 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
1220 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1221 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
1222
1223 status = WLAN_STATUS_REQUEST_DECLINED;
1224
1225 /* sanity check for incoming parameters:
1226 * check if configuration can support the BA policy
1227 * and if buffer size does not exceeds max value */
1228 if (((ba_policy != 1)
1229 && (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA)))
1230 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
1231 status = WLAN_STATUS_INVALID_QOS_PARAM;
1232 #ifdef CONFIG_MAC80211_HT_DEBUG
1233 if (net_ratelimit())
1234 printk(KERN_DEBUG "AddBA Req with bad params from "
1235 "%s on tid %u. policy %d, buffer size %d\n",
1236 print_mac(mac, mgmt->sa), tid, ba_policy,
1237 buf_size);
1238 #endif /* CONFIG_MAC80211_HT_DEBUG */
1239 goto end_no_lock;
1240 }
1241 /* determine default buffer size */
1242 if (buf_size == 0) {
1243 struct ieee80211_supported_band *sband;
1244
1245 sband = local->hw.wiphy->bands[conf->channel->band];
1246 buf_size = IEEE80211_MIN_AMPDU_BUF;
1247 buf_size = buf_size << sband->ht_info.ampdu_factor;
1248 }
1249
1250
1251 /* examine state machine */
1252 spin_lock_bh(&sta->lock);
1253
1254 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
1255 #ifdef CONFIG_MAC80211_HT_DEBUG
1256 if (net_ratelimit())
1257 printk(KERN_DEBUG "unexpected AddBA Req from "
1258 "%s on tid %u\n",
1259 print_mac(mac, mgmt->sa), tid);
1260 #endif /* CONFIG_MAC80211_HT_DEBUG */
1261 goto end;
1262 }
1263
1264 /* prepare A-MPDU MLME for Rx aggregation */
1265 sta->ampdu_mlme.tid_rx[tid] =
1266 kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
1267 if (!sta->ampdu_mlme.tid_rx[tid]) {
1268 #ifdef CONFIG_MAC80211_HT_DEBUG
1269 if (net_ratelimit())
1270 printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
1271 tid);
1272 #endif
1273 goto end;
1274 }
1275 /* rx timer */
1276 sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
1277 sta_rx_agg_session_timer_expired;
1278 sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
1279 (unsigned long)&sta->timer_to_tid[tid];
1280 init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1281
1282 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
1283
1284 /* prepare reordering buffer */
1285 tid_agg_rx->reorder_buf =
1286 kmalloc(buf_size * sizeof(struct sk_buff *), GFP_ATOMIC);
1287 if (!tid_agg_rx->reorder_buf) {
1288 #ifdef CONFIG_MAC80211_HT_DEBUG
1289 if (net_ratelimit())
1290 printk(KERN_ERR "can not allocate reordering buffer "
1291 "to tid %d\n", tid);
1292 #endif
1293 kfree(sta->ampdu_mlme.tid_rx[tid]);
1294 goto end;
1295 }
1296 memset(tid_agg_rx->reorder_buf, 0,
1297 buf_size * sizeof(struct sk_buff *));
1298
1299 if (local->ops->ampdu_action)
1300 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
1301 sta->addr, tid, &start_seq_num);
1302 #ifdef CONFIG_MAC80211_HT_DEBUG
1303 printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
1304 #endif /* CONFIG_MAC80211_HT_DEBUG */
1305
1306 if (ret) {
1307 kfree(tid_agg_rx->reorder_buf);
1308 kfree(tid_agg_rx);
1309 sta->ampdu_mlme.tid_rx[tid] = NULL;
1310 goto end;
1311 }
1312
1313 /* change state and send addba resp */
1314 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
1315 tid_agg_rx->dialog_token = dialog_token;
1316 tid_agg_rx->ssn = start_seq_num;
1317 tid_agg_rx->head_seq_num = start_seq_num;
1318 tid_agg_rx->buf_size = buf_size;
1319 tid_agg_rx->timeout = timeout;
1320 tid_agg_rx->stored_mpdu_num = 0;
1321 status = WLAN_STATUS_SUCCESS;
1322 end:
1323 spin_unlock_bh(&sta->lock);
1324
1325 end_no_lock:
1326 ieee80211_send_addba_resp(sta->sdata, sta->addr, tid,
1327 dialog_token, status, 1, buf_size, timeout);
1328 rcu_read_unlock();
1329 }
1330
1331 static void ieee80211_sta_process_addba_resp(struct ieee80211_local *local,
1332 struct ieee80211_mgmt *mgmt,
1333 size_t len)
1334 {
1335 struct ieee80211_hw *hw = &local->hw;
1336 struct sta_info *sta;
1337 u16 capab;
1338 u16 tid;
1339 u8 *state;
1340
1341 rcu_read_lock();
1342
1343 sta = sta_info_get(local, mgmt->sa);
1344 if (!sta) {
1345 rcu_read_unlock();
1346 return;
1347 }
1348
1349 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
1350 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1351
1352 state = &sta->ampdu_mlme.tid_state_tx[tid];
1353
1354 spin_lock_bh(&sta->lock);
1355
1356 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1357 spin_unlock_bh(&sta->lock);
1358 goto addba_resp_exit;
1359 }
1360
1361 if (mgmt->u.action.u.addba_resp.dialog_token !=
1362 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
1363 spin_unlock_bh(&sta->lock);
1364 #ifdef CONFIG_MAC80211_HT_DEBUG
1365 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
1366 #endif /* CONFIG_MAC80211_HT_DEBUG */
1367 goto addba_resp_exit;
1368 }
1369
1370 del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
1371 #ifdef CONFIG_MAC80211_HT_DEBUG
1372 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
1373 #endif /* CONFIG_MAC80211_HT_DEBUG */
1374 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
1375 == WLAN_STATUS_SUCCESS) {
1376 *state |= HT_ADDBA_RECEIVED_MSK;
1377 sta->ampdu_mlme.addba_req_num[tid] = 0;
1378
1379 if (*state == HT_AGG_STATE_OPERATIONAL)
1380 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
1381
1382 spin_unlock_bh(&sta->lock);
1383 } else {
1384 sta->ampdu_mlme.addba_req_num[tid]++;
1385 /* this will allow the state check in stop_BA_session */
1386 *state = HT_AGG_STATE_OPERATIONAL;
1387 spin_unlock_bh(&sta->lock);
1388 ieee80211_stop_tx_ba_session(hw, sta->addr, tid,
1389 WLAN_BACK_INITIATOR);
1390 }
1391
1392 addba_resp_exit:
1393 rcu_read_unlock();
1394 }
1395
1396 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, const u8 *da, u16 tid,
1397 u16 initiator, u16 reason_code)
1398 {
1399 struct ieee80211_local *local = sdata->local;
1400 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1401 struct sk_buff *skb;
1402 struct ieee80211_mgmt *mgmt;
1403 u16 params;
1404
1405 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1406
1407 if (!skb) {
1408 printk(KERN_ERR "%s: failed to allocate buffer "
1409 "for delba frame\n", sdata->dev->name);
1410 return;
1411 }
1412
1413 skb_reserve(skb, local->hw.extra_tx_headroom);
1414 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1415 memset(mgmt, 0, 24);
1416 memcpy(mgmt->da, da, ETH_ALEN);
1417 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1418 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1419 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1420 else
1421 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1422 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1423 IEEE80211_STYPE_ACTION);
1424
1425 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
1426
1427 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1428 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
1429 params = (u16)(initiator << 11); /* bit 11 initiator */
1430 params |= (u16)(tid << 12); /* bit 15:12 TID number */
1431
1432 mgmt->u.action.u.delba.params = cpu_to_le16(params);
1433 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
1434
1435 ieee80211_sta_tx(sdata, skb, 0);
1436 }
1437
1438 void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
1439 {
1440 struct ieee80211_local *local = sdata->local;
1441 struct sk_buff *skb;
1442 struct ieee80211_bar *bar;
1443 u16 bar_control = 0;
1444
1445 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
1446 if (!skb) {
1447 printk(KERN_ERR "%s: failed to allocate buffer for "
1448 "bar frame\n", sdata->dev->name);
1449 return;
1450 }
1451 skb_reserve(skb, local->hw.extra_tx_headroom);
1452 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
1453 memset(bar, 0, sizeof(*bar));
1454 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
1455 IEEE80211_STYPE_BACK_REQ);
1456 memcpy(bar->ra, ra, ETH_ALEN);
1457 memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN);
1458 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
1459 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
1460 bar_control |= (u16)(tid << 12);
1461 bar->control = cpu_to_le16(bar_control);
1462 bar->start_seq_num = cpu_to_le16(ssn);
1463
1464 ieee80211_sta_tx(sdata, skb, 0);
1465 }
1466
1467 void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
1468 u16 initiator, u16 reason)
1469 {
1470 struct ieee80211_local *local = sdata->local;
1471 struct ieee80211_hw *hw = &local->hw;
1472 struct sta_info *sta;
1473 int ret, i;
1474 DECLARE_MAC_BUF(mac);
1475
1476 rcu_read_lock();
1477
1478 sta = sta_info_get(local, ra);
1479 if (!sta) {
1480 rcu_read_unlock();
1481 return;
1482 }
1483
1484 /* check if TID is in operational state */
1485 spin_lock_bh(&sta->lock);
1486 if (sta->ampdu_mlme.tid_state_rx[tid]
1487 != HT_AGG_STATE_OPERATIONAL) {
1488 spin_unlock_bh(&sta->lock);
1489 rcu_read_unlock();
1490 return;
1491 }
1492 sta->ampdu_mlme.tid_state_rx[tid] =
1493 HT_AGG_STATE_REQ_STOP_BA_MSK |
1494 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
1495 spin_unlock_bh(&sta->lock);
1496
1497 /* stop HW Rx aggregation. ampdu_action existence
1498 * already verified in session init so we add the BUG_ON */
1499 BUG_ON(!local->ops->ampdu_action);
1500
1501 #ifdef CONFIG_MAC80211_HT_DEBUG
1502 printk(KERN_DEBUG "Rx BA session stop requested for %s tid %u\n",
1503 print_mac(mac, ra), tid);
1504 #endif /* CONFIG_MAC80211_HT_DEBUG */
1505
1506 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
1507 ra, tid, NULL);
1508 if (ret)
1509 printk(KERN_DEBUG "HW problem - can not stop rx "
1510 "aggregation for tid %d\n", tid);
1511
1512 /* shutdown timer has not expired */
1513 if (initiator != WLAN_BACK_TIMER)
1514 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1515
1516 /* check if this is a self generated aggregation halt */
1517 if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
1518 ieee80211_send_delba(sdata, ra, tid, 0, reason);
1519
1520 /* free the reordering buffer */
1521 for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
1522 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
1523 /* release the reordered frames */
1524 dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
1525 sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
1526 sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
1527 }
1528 }
1529 /* free resources */
1530 kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
1531 kfree(sta->ampdu_mlme.tid_rx[tid]);
1532 sta->ampdu_mlme.tid_rx[tid] = NULL;
1533 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
1534
1535 rcu_read_unlock();
1536 }
1537
1538
1539 static void ieee80211_sta_process_delba(struct ieee80211_sub_if_data *sdata,
1540 struct ieee80211_mgmt *mgmt, size_t len)
1541 {
1542 struct ieee80211_local *local = sdata->local;
1543 struct sta_info *sta;
1544 u16 tid, params;
1545 u16 initiator;
1546 DECLARE_MAC_BUF(mac);
1547
1548 rcu_read_lock();
1549
1550 sta = sta_info_get(local, mgmt->sa);
1551 if (!sta) {
1552 rcu_read_unlock();
1553 return;
1554 }
1555
1556 params = le16_to_cpu(mgmt->u.action.u.delba.params);
1557 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
1558 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
1559
1560 #ifdef CONFIG_MAC80211_HT_DEBUG
1561 if (net_ratelimit())
1562 printk(KERN_DEBUG "delba from %s (%s) tid %d reason code %d\n",
1563 print_mac(mac, mgmt->sa),
1564 initiator ? "initiator" : "recipient", tid,
1565 mgmt->u.action.u.delba.reason_code);
1566 #endif /* CONFIG_MAC80211_HT_DEBUG */
1567
1568 if (initiator == WLAN_BACK_INITIATOR)
1569 ieee80211_sta_stop_rx_ba_session(sdata, sta->addr, tid,
1570 WLAN_BACK_INITIATOR, 0);
1571 else { /* WLAN_BACK_RECIPIENT */
1572 spin_lock_bh(&sta->lock);
1573 sta->ampdu_mlme.tid_state_tx[tid] =
1574 HT_AGG_STATE_OPERATIONAL;
1575 spin_unlock_bh(&sta->lock);
1576 ieee80211_stop_tx_ba_session(&local->hw, sta->addr, tid,
1577 WLAN_BACK_RECIPIENT);
1578 }
1579 rcu_read_unlock();
1580 }
1581
1582 /*
1583 * After sending add Block Ack request we activated a timer until
1584 * add Block Ack response will arrive from the recipient.
1585 * If this timer expires sta_addba_resp_timer_expired will be executed.
1586 */
1587 void sta_addba_resp_timer_expired(unsigned long data)
1588 {
1589 /* not an elegant detour, but there is no choice as the timer passes
1590 * only one argument, and both sta_info and TID are needed, so init
1591 * flow in sta_info_create gives the TID as data, while the timer_to_id
1592 * array gives the sta through container_of */
1593 u16 tid = *(u8 *)data;
1594 struct sta_info *temp_sta = container_of((void *)data,
1595 struct sta_info, timer_to_tid[tid]);
1596
1597 struct ieee80211_local *local = temp_sta->local;
1598 struct ieee80211_hw *hw = &local->hw;
1599 struct sta_info *sta;
1600 u8 *state;
1601
1602 rcu_read_lock();
1603
1604 sta = sta_info_get(local, temp_sta->addr);
1605 if (!sta) {
1606 rcu_read_unlock();
1607 return;
1608 }
1609
1610 state = &sta->ampdu_mlme.tid_state_tx[tid];
1611 /* check if the TID waits for addBA response */
1612 spin_lock_bh(&sta->lock);
1613 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1614 spin_unlock_bh(&sta->lock);
1615 *state = HT_AGG_STATE_IDLE;
1616 #ifdef CONFIG_MAC80211_HT_DEBUG
1617 printk(KERN_DEBUG "timer expired on tid %d but we are not "
1618 "expecting addBA response there", tid);
1619 #endif
1620 goto timer_expired_exit;
1621 }
1622
1623 #ifdef CONFIG_MAC80211_HT_DEBUG
1624 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
1625 #endif
1626
1627 /* go through the state check in stop_BA_session */
1628 *state = HT_AGG_STATE_OPERATIONAL;
1629 spin_unlock_bh(&sta->lock);
1630 ieee80211_stop_tx_ba_session(hw, temp_sta->addr, tid,
1631 WLAN_BACK_INITIATOR);
1632
1633 timer_expired_exit:
1634 rcu_read_unlock();
1635 }
1636
1637 /*
1638 * After accepting the AddBA Request we activated a timer,
1639 * resetting it after each frame that arrives from the originator.
1640 * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
1641 */
1642 static void sta_rx_agg_session_timer_expired(unsigned long data)
1643 {
1644 /* not an elegant detour, but there is no choice as the timer passes
1645 * only one argument, and various sta_info are needed here, so init
1646 * flow in sta_info_create gives the TID as data, while the timer_to_id
1647 * array gives the sta through container_of */
1648 u8 *ptid = (u8 *)data;
1649 u8 *timer_to_id = ptid - *ptid;
1650 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
1651 timer_to_tid[0]);
1652
1653 #ifdef CONFIG_MAC80211_HT_DEBUG
1654 printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
1655 #endif
1656 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->addr,
1657 (u16)*ptid, WLAN_BACK_TIMER,
1658 WLAN_REASON_QSTA_TIMEOUT);
1659 }
1660
1661 void ieee80211_sta_tear_down_BA_sessions(struct ieee80211_sub_if_data *sdata, u8 *addr)
1662 {
1663 struct ieee80211_local *local = sdata->local;
1664 int i;
1665
1666 for (i = 0; i < STA_TID_NUM; i++) {
1667 ieee80211_stop_tx_ba_session(&local->hw, addr, i,
1668 WLAN_BACK_INITIATOR);
1669 ieee80211_sta_stop_rx_ba_session(sdata, addr, i,
1670 WLAN_BACK_RECIPIENT,
1671 WLAN_REASON_QSTA_LEAVE_QBSS);
1672 }
1673 }
1674
1675 static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
1676 struct ieee80211_msrment_ie *request_ie,
1677 const u8 *da, const u8 *bssid,
1678 u8 dialog_token)
1679 {
1680 struct ieee80211_local *local = sdata->local;
1681 struct sk_buff *skb;
1682 struct ieee80211_mgmt *msr_report;
1683
1684 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
1685 sizeof(struct ieee80211_msrment_ie));
1686
1687 if (!skb) {
1688 printk(KERN_ERR "%s: failed to allocate buffer for "
1689 "measurement report frame\n", sdata->dev->name);
1690 return;
1691 }
1692
1693 skb_reserve(skb, local->hw.extra_tx_headroom);
1694 msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
1695 memset(msr_report, 0, 24);
1696 memcpy(msr_report->da, da, ETH_ALEN);
1697 memcpy(msr_report->sa, sdata->dev->dev_addr, ETH_ALEN);
1698 memcpy(msr_report->bssid, bssid, ETH_ALEN);
1699 msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1700 IEEE80211_STYPE_ACTION);
1701
1702 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
1703 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
1704 msr_report->u.action.u.measurement.action_code =
1705 WLAN_ACTION_SPCT_MSR_RPRT;
1706 msr_report->u.action.u.measurement.dialog_token = dialog_token;
1707
1708 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
1709 msr_report->u.action.u.measurement.length =
1710 sizeof(struct ieee80211_msrment_ie);
1711
1712 memset(&msr_report->u.action.u.measurement.msr_elem, 0,
1713 sizeof(struct ieee80211_msrment_ie));
1714 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
1715 msr_report->u.action.u.measurement.msr_elem.mode |=
1716 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
1717 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
1718
1719 ieee80211_sta_tx(sdata, skb, 0);
1720 }
1721
1722 static void ieee80211_sta_process_measurement_req(struct ieee80211_sub_if_data *sdata,
1723 struct ieee80211_mgmt *mgmt,
1724 size_t len)
1725 {
1726 /*
1727 * Ignoring measurement request is spec violation.
1728 * Mandatory measurements must be reported optional
1729 * measurements might be refused or reported incapable
1730 * For now just refuse
1731 * TODO: Answer basic measurement as unmeasured
1732 */
1733 ieee80211_send_refuse_measurement_request(sdata,
1734 &mgmt->u.action.u.measurement.msr_elem,
1735 mgmt->sa, mgmt->bssid,
1736 mgmt->u.action.u.measurement.dialog_token);
1737 }
1738
1739
1740 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1741 struct ieee80211_if_sta *ifsta,
1742 struct ieee80211_mgmt *mgmt,
1743 size_t len)
1744 {
1745 u16 auth_alg, auth_transaction, status_code;
1746 DECLARE_MAC_BUF(mac);
1747
1748 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1749 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1750 return;
1751
1752 if (len < 24 + 6)
1753 return;
1754
1755 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1756 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1757 return;
1758
1759 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1760 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1761 return;
1762
1763 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1764 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1765 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1766
1767 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1768 /*
1769 * IEEE 802.11 standard does not require authentication in IBSS
1770 * networks and most implementations do not seem to use it.
1771 * However, try to reply to authentication attempts if someone
1772 * has actually implemented this.
1773 */
1774 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1775 return;
1776 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1777 }
1778
1779 if (auth_alg != ifsta->auth_alg ||
1780 auth_transaction != ifsta->auth_transaction)
1781 return;
1782
1783 if (status_code != WLAN_STATUS_SUCCESS) {
1784 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1785 u8 algs[3];
1786 const int num_algs = ARRAY_SIZE(algs);
1787 int i, pos;
1788 algs[0] = algs[1] = algs[2] = 0xff;
1789 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1790 algs[0] = WLAN_AUTH_OPEN;
1791 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1792 algs[1] = WLAN_AUTH_SHARED_KEY;
1793 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1794 algs[2] = WLAN_AUTH_LEAP;
1795 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1796 pos = 0;
1797 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1798 pos = 1;
1799 else
1800 pos = 2;
1801 for (i = 0; i < num_algs; i++) {
1802 pos++;
1803 if (pos >= num_algs)
1804 pos = 0;
1805 if (algs[pos] == ifsta->auth_alg ||
1806 algs[pos] == 0xff)
1807 continue;
1808 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1809 !ieee80211_sta_wep_configured(sdata))
1810 continue;
1811 ifsta->auth_alg = algs[pos];
1812 break;
1813 }
1814 }
1815 return;
1816 }
1817
1818 switch (ifsta->auth_alg) {
1819 case WLAN_AUTH_OPEN:
1820 case WLAN_AUTH_LEAP:
1821 ieee80211_auth_completed(sdata, ifsta);
1822 break;
1823 case WLAN_AUTH_SHARED_KEY:
1824 if (ifsta->auth_transaction == 4)
1825 ieee80211_auth_completed(sdata, ifsta);
1826 else
1827 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1828 break;
1829 }
1830 }
1831
1832
1833 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1834 struct ieee80211_if_sta *ifsta,
1835 struct ieee80211_mgmt *mgmt,
1836 size_t len)
1837 {
1838 u16 reason_code;
1839 DECLARE_MAC_BUF(mac);
1840
1841 if (len < 24 + 2)
1842 return;
1843
1844 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1845 return;
1846
1847 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1848
1849 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1850 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
1851
1852 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1853 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1854 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1855 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1856 mod_timer(&ifsta->timer, jiffies +
1857 IEEE80211_RETRY_AUTH_INTERVAL);
1858 }
1859
1860 ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1861 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1862 }
1863
1864
1865 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1866 struct ieee80211_if_sta *ifsta,
1867 struct ieee80211_mgmt *mgmt,
1868 size_t len)
1869 {
1870 u16 reason_code;
1871 DECLARE_MAC_BUF(mac);
1872
1873 if (len < 24 + 2)
1874 return;
1875
1876 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1877 return;
1878
1879 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1880
1881 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1882 printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name);
1883
1884 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1885 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1886 mod_timer(&ifsta->timer, jiffies +
1887 IEEE80211_RETRY_AUTH_INTERVAL);
1888 }
1889
1890 ieee80211_set_disassoc(sdata, ifsta, false, false, 0);
1891 }
1892
1893
1894 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1895 struct ieee80211_if_sta *ifsta,
1896 struct ieee80211_mgmt *mgmt,
1897 size_t len,
1898 int reassoc)
1899 {
1900 struct ieee80211_local *local = sdata->local;
1901 struct ieee80211_supported_band *sband;
1902 struct sta_info *sta;
1903 u64 rates, basic_rates;
1904 u16 capab_info, status_code, aid;
1905 struct ieee802_11_elems elems;
1906 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
1907 u8 *pos;
1908 int i, j;
1909 DECLARE_MAC_BUF(mac);
1910 bool have_higher_than_11mbit = false;
1911
1912 /* AssocResp and ReassocResp have identical structure, so process both
1913 * of them in this function. */
1914
1915 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1916 return;
1917
1918 if (len < 24 + 6)
1919 return;
1920
1921 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1922 return;
1923
1924 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1925 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1926 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1927
1928 printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
1929 "status=%d aid=%d)\n",
1930 sdata->dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
1931 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1932
1933 if (status_code != WLAN_STATUS_SUCCESS) {
1934 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1935 sdata->dev->name, status_code);
1936 /* if this was a reassociation, ensure we try a "full"
1937 * association next time. This works around some broken APs
1938 * which do not correctly reject reassociation requests. */
1939 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1940 return;
1941 }
1942
1943 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1944 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1945 "set\n", sdata->dev->name, aid);
1946 aid &= ~(BIT(15) | BIT(14));
1947
1948 pos = mgmt->u.assoc_resp.variable;
1949 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1950
1951 if (!elems.supp_rates) {
1952 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1953 sdata->dev->name);
1954 return;
1955 }
1956
1957 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1958 ifsta->aid = aid;
1959 ifsta->ap_capab = capab_info;
1960
1961 kfree(ifsta->assocresp_ies);
1962 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1963 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1964 if (ifsta->assocresp_ies)
1965 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1966
1967 rcu_read_lock();
1968
1969 /* Add STA entry for the AP */
1970 sta = sta_info_get(local, ifsta->bssid);
1971 if (!sta) {
1972 struct ieee80211_sta_bss *bss;
1973 int err;
1974
1975 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1976 if (!sta) {
1977 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1978 " the AP\n", sdata->dev->name);
1979 rcu_read_unlock();
1980 return;
1981 }
1982 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1983 local->hw.conf.channel->center_freq,
1984 ifsta->ssid, ifsta->ssid_len);
1985 if (bss) {
1986 sta->last_signal = bss->signal;
1987 sta->last_qual = bss->qual;
1988 sta->last_noise = bss->noise;
1989 ieee80211_rx_bss_put(local, bss);
1990 }
1991
1992 err = sta_info_insert(sta);
1993 if (err) {
1994 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1995 " the AP (error %d)\n", sdata->dev->name, err);
1996 rcu_read_unlock();
1997 return;
1998 }
1999 /* update new sta with its last rx activity */
2000 sta->last_rx = jiffies;
2001 }
2002
2003 /*
2004 * FIXME: Do we really need to update the sta_info's information here?
2005 * We already know about the AP (we found it in our list) so it
2006 * should already be filled with the right info, no?
2007 * As is stands, all this is racy because typically we assume
2008 * the information that is filled in here (except flags) doesn't
2009 * change while a STA structure is alive. As such, it should move
2010 * to between the sta_info_alloc() and sta_info_insert() above.
2011 */
2012
2013 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
2014 WLAN_STA_AUTHORIZED);
2015
2016 rates = 0;
2017 basic_rates = 0;
2018 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2019
2020 for (i = 0; i < elems.supp_rates_len; i++) {
2021 int rate = (elems.supp_rates[i] & 0x7f) * 5;
2022
2023 if (rate > 110)
2024 have_higher_than_11mbit = true;
2025
2026 for (j = 0; j < sband->n_bitrates; j++) {
2027 if (sband->bitrates[j].bitrate == rate)
2028 rates |= BIT(j);
2029 if (elems.supp_rates[i] & 0x80)
2030 basic_rates |= BIT(j);
2031 }
2032 }
2033
2034 for (i = 0; i < elems.ext_supp_rates_len; i++) {
2035 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
2036
2037 if (rate > 110)
2038 have_higher_than_11mbit = true;
2039
2040 for (j = 0; j < sband->n_bitrates; j++) {
2041 if (sband->bitrates[j].bitrate == rate)
2042 rates |= BIT(j);
2043 if (elems.ext_supp_rates[i] & 0x80)
2044 basic_rates |= BIT(j);
2045 }
2046 }
2047
2048 sta->supp_rates[local->hw.conf.channel->band] = rates;
2049 sdata->basic_rates = basic_rates;
2050
2051 /* cf. IEEE 802.11 9.2.12 */
2052 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
2053 have_higher_than_11mbit)
2054 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
2055 else
2056 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
2057
2058 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2059 (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
2060 struct ieee80211_ht_bss_info bss_info;
2061 ieee80211_ht_cap_ie_to_ht_info(
2062 (struct ieee80211_ht_cap *)
2063 elems.ht_cap_elem, &sta->ht_info);
2064 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2065 (struct ieee80211_ht_addt_info *)
2066 elems.ht_info_elem, &bss_info);
2067 ieee80211_handle_ht(local, 1, &sta->ht_info, &bss_info);
2068 }
2069
2070 rate_control_rate_init(sta, local);
2071
2072 if (elems.wmm_param) {
2073 set_sta_flags(sta, WLAN_STA_WME);
2074 rcu_read_unlock();
2075 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
2076 elems.wmm_param_len);
2077 } else
2078 rcu_read_unlock();
2079
2080 /* set AID and assoc capability,
2081 * ieee80211_set_associated() will tell the driver */
2082 bss_conf->aid = aid;
2083 bss_conf->assoc_capability = capab_info;
2084 ieee80211_set_associated(sdata, ifsta, 1);
2085
2086 ieee80211_associated(sdata, ifsta);
2087 }
2088
2089
2090 /* Caller must hold local->sta_bss_lock */
2091 static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
2092 struct ieee80211_sta_bss *bss)
2093 {
2094 u8 hash_idx;
2095
2096 if (bss_mesh_cfg(bss))
2097 hash_idx = mesh_id_hash(bss_mesh_id(bss),
2098 bss_mesh_id_len(bss));
2099 else
2100 hash_idx = STA_HASH(bss->bssid);
2101
2102 bss->hnext = local->sta_bss_hash[hash_idx];
2103 local->sta_bss_hash[hash_idx] = bss;
2104 }
2105
2106
2107 /* Caller must hold local->sta_bss_lock */
2108 static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
2109 struct ieee80211_sta_bss *bss)
2110 {
2111 struct ieee80211_sta_bss *b, *prev = NULL;
2112 b = local->sta_bss_hash[STA_HASH(bss->bssid)];
2113 while (b) {
2114 if (b == bss) {
2115 if (!prev)
2116 local->sta_bss_hash[STA_HASH(bss->bssid)] =
2117 bss->hnext;
2118 else
2119 prev->hnext = bss->hnext;
2120 break;
2121 }
2122 prev = b;
2123 b = b->hnext;
2124 }
2125 }
2126
2127
2128 static struct ieee80211_sta_bss *
2129 ieee80211_rx_bss_add(struct ieee80211_sub_if_data *sdata, u8 *bssid, int freq,
2130 u8 *ssid, u8 ssid_len)
2131 {
2132 struct ieee80211_local *local = sdata->local;
2133 struct ieee80211_sta_bss *bss;
2134
2135 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2136 if (!bss)
2137 return NULL;
2138 atomic_inc(&bss->users);
2139 atomic_inc(&bss->users);
2140 memcpy(bss->bssid, bssid, ETH_ALEN);
2141 bss->freq = freq;
2142 if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
2143 memcpy(bss->ssid, ssid, ssid_len);
2144 bss->ssid_len = ssid_len;
2145 }
2146
2147 spin_lock_bh(&local->sta_bss_lock);
2148 /* TODO: order by RSSI? */
2149 list_add_tail(&bss->list, &local->sta_bss_list);
2150 __ieee80211_rx_bss_hash_add(local, bss);
2151 spin_unlock_bh(&local->sta_bss_lock);
2152 return bss;
2153 }
2154
2155 static struct ieee80211_sta_bss *
2156 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
2157 u8 *ssid, u8 ssid_len)
2158 {
2159 struct ieee80211_sta_bss *bss;
2160
2161 spin_lock_bh(&local->sta_bss_lock);
2162 bss = local->sta_bss_hash[STA_HASH(bssid)];
2163 while (bss) {
2164 if (!bss_mesh_cfg(bss) &&
2165 !memcmp(bss->bssid, bssid, ETH_ALEN) &&
2166 bss->freq == freq &&
2167 bss->ssid_len == ssid_len &&
2168 (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
2169 atomic_inc(&bss->users);
2170 break;
2171 }
2172 bss = bss->hnext;
2173 }
2174 spin_unlock_bh(&local->sta_bss_lock);
2175 return bss;
2176 }
2177
2178 #ifdef CONFIG_MAC80211_MESH
2179 static struct ieee80211_sta_bss *
2180 ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
2181 u8 *mesh_cfg, int freq)
2182 {
2183 struct ieee80211_sta_bss *bss;
2184
2185 spin_lock_bh(&local->sta_bss_lock);
2186 bss = local->sta_bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
2187 while (bss) {
2188 if (bss_mesh_cfg(bss) &&
2189 !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
2190 bss->freq == freq &&
2191 mesh_id_len == bss->mesh_id_len &&
2192 (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
2193 mesh_id_len))) {
2194 atomic_inc(&bss->users);
2195 break;
2196 }
2197 bss = bss->hnext;
2198 }
2199 spin_unlock_bh(&local->sta_bss_lock);
2200 return bss;
2201 }
2202
2203 static struct ieee80211_sta_bss *
2204 ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
2205 u8 *mesh_cfg, int mesh_config_len, int freq)
2206 {
2207 struct ieee80211_sta_bss *bss;
2208
2209 if (mesh_config_len != MESH_CFG_LEN)
2210 return NULL;
2211
2212 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2213 if (!bss)
2214 return NULL;
2215
2216 bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
2217 if (!bss->mesh_cfg) {
2218 kfree(bss);
2219 return NULL;
2220 }
2221
2222 if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
2223 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
2224 if (!bss->mesh_id) {
2225 kfree(bss->mesh_cfg);
2226 kfree(bss);
2227 return NULL;
2228 }
2229 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
2230 }
2231
2232 atomic_inc(&bss->users);
2233 atomic_inc(&bss->users);
2234 memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
2235 bss->mesh_id_len = mesh_id_len;
2236 bss->freq = freq;
2237 spin_lock_bh(&local->sta_bss_lock);
2238 /* TODO: order by RSSI? */
2239 list_add_tail(&bss->list, &local->sta_bss_list);
2240 __ieee80211_rx_bss_hash_add(local, bss);
2241 spin_unlock_bh(&local->sta_bss_lock);
2242 return bss;
2243 }
2244 #endif
2245
2246 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
2247 {
2248 kfree(bss->ies);
2249 kfree(bss_mesh_id(bss));
2250 kfree(bss_mesh_cfg(bss));
2251 kfree(bss);
2252 }
2253
2254
2255 static void ieee80211_rx_bss_put(struct ieee80211_local *local,
2256 struct ieee80211_sta_bss *bss)
2257 {
2258 local_bh_disable();
2259 if (!atomic_dec_and_lock(&bss->users, &local->sta_bss_lock)) {
2260 local_bh_enable();
2261 return;
2262 }
2263
2264 __ieee80211_rx_bss_hash_del(local, bss);
2265 list_del(&bss->list);
2266 spin_unlock_bh(&local->sta_bss_lock);
2267 ieee80211_rx_bss_free(bss);
2268 }
2269
2270
2271 void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
2272 {
2273 spin_lock_init(&local->sta_bss_lock);
2274 INIT_LIST_HEAD(&local->sta_bss_list);
2275 }
2276
2277
2278 void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
2279 {
2280 struct ieee80211_sta_bss *bss, *tmp;
2281
2282 list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
2283 ieee80211_rx_bss_put(local, bss);
2284 }
2285
2286
2287 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
2288 struct ieee80211_if_sta *ifsta,
2289 struct ieee80211_sta_bss *bss)
2290 {
2291 struct ieee80211_local *local = sdata->local;
2292 int res, rates, i, j;
2293 struct sk_buff *skb;
2294 struct ieee80211_mgmt *mgmt;
2295 u8 *pos;
2296 struct ieee80211_supported_band *sband;
2297 union iwreq_data wrqu;
2298
2299 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2300
2301 /* Remove possible STA entries from other IBSS networks. */
2302 sta_info_flush_delayed(sdata);
2303
2304 if (local->ops->reset_tsf) {
2305 /* Reset own TSF to allow time synchronization work. */
2306 local->ops->reset_tsf(local_to_hw(local));
2307 }
2308 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2309 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2310 if (res)
2311 return res;
2312
2313 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2314
2315 sdata->drop_unencrypted = bss->capability &
2316 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2317
2318 res = ieee80211_set_freq(sdata, bss->freq);
2319
2320 if (res)
2321 return res;
2322
2323 /* Build IBSS probe response */
2324 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2325 if (skb) {
2326 skb_reserve(skb, local->hw.extra_tx_headroom);
2327
2328 mgmt = (struct ieee80211_mgmt *)
2329 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2330 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2331 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2332 IEEE80211_STYPE_PROBE_RESP);
2333 memset(mgmt->da, 0xff, ETH_ALEN);
2334 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
2335 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2336 mgmt->u.beacon.beacon_int =
2337 cpu_to_le16(local->hw.conf.beacon_int);
2338 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
2339 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2340
2341 pos = skb_put(skb, 2 + ifsta->ssid_len);
2342 *pos++ = WLAN_EID_SSID;
2343 *pos++ = ifsta->ssid_len;
2344 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2345
2346 rates = bss->supp_rates_len;
2347 if (rates > 8)
2348 rates = 8;
2349 pos = skb_put(skb, 2 + rates);
2350 *pos++ = WLAN_EID_SUPP_RATES;
2351 *pos++ = rates;
2352 memcpy(pos, bss->supp_rates, rates);
2353
2354 if (bss->band == IEEE80211_BAND_2GHZ) {
2355 pos = skb_put(skb, 2 + 1);
2356 *pos++ = WLAN_EID_DS_PARAMS;
2357 *pos++ = 1;
2358 *pos++ = ieee80211_frequency_to_channel(bss->freq);
2359 }
2360
2361 pos = skb_put(skb, 2 + 2);
2362 *pos++ = WLAN_EID_IBSS_PARAMS;
2363 *pos++ = 2;
2364 /* FIX: set ATIM window based on scan results */
2365 *pos++ = 0;
2366 *pos++ = 0;
2367
2368 if (bss->supp_rates_len > 8) {
2369 rates = bss->supp_rates_len - 8;
2370 pos = skb_put(skb, 2 + rates);
2371 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2372 *pos++ = rates;
2373 memcpy(pos, &bss->supp_rates[8], rates);
2374 }
2375
2376 ifsta->probe_resp = skb;
2377
2378 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
2379 }
2380
2381 rates = 0;
2382 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2383 for (i = 0; i < bss->supp_rates_len; i++) {
2384 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2385 for (j = 0; j < sband->n_bitrates; j++)
2386 if (sband->bitrates[j].bitrate == bitrate)
2387 rates |= BIT(j);
2388 }
2389 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
2390
2391 ieee80211_sta_def_wmm_params(sdata, bss, 1);
2392
2393 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
2394 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2395
2396 memset(&wrqu, 0, sizeof(wrqu));
2397 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2398 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
2399
2400 return res;
2401 }
2402
2403 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
2404 struct ieee802_11_elems *elems,
2405 enum ieee80211_band band)
2406 {
2407 struct ieee80211_supported_band *sband;
2408 struct ieee80211_rate *bitrates;
2409 size_t num_rates;
2410 u64 supp_rates;
2411 int i, j;
2412 sband = local->hw.wiphy->bands[band];
2413
2414 if (!sband) {
2415 WARN_ON(1);
2416 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2417 }
2418
2419 bitrates = sband->bitrates;
2420 num_rates = sband->n_bitrates;
2421 supp_rates = 0;
2422 for (i = 0; i < elems->supp_rates_len +
2423 elems->ext_supp_rates_len; i++) {
2424 u8 rate = 0;
2425 int own_rate;
2426 if (i < elems->supp_rates_len)
2427 rate = elems->supp_rates[i];
2428 else if (elems->ext_supp_rates)
2429 rate = elems->ext_supp_rates
2430 [i - elems->supp_rates_len];
2431 own_rate = 5 * (rate & 0x7f);
2432 for (j = 0; j < num_rates; j++)
2433 if (bitrates[j].bitrate == own_rate)
2434 supp_rates |= BIT(j);
2435 }
2436 return supp_rates;
2437 }
2438
2439 static u64 ieee80211_sta_get_mandatory_rates(struct ieee80211_local *local,
2440 enum ieee80211_band band)
2441 {
2442 struct ieee80211_supported_band *sband;
2443 struct ieee80211_rate *bitrates;
2444 u64 mandatory_rates;
2445 enum ieee80211_rate_flags mandatory_flag;
2446 int i;
2447
2448 sband = local->hw.wiphy->bands[band];
2449 if (!sband) {
2450 WARN_ON(1);
2451 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2452 }
2453
2454 if (band == IEEE80211_BAND_2GHZ)
2455 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
2456 else
2457 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
2458
2459 bitrates = sband->bitrates;
2460 mandatory_rates = 0;
2461 for (i = 0; i < sband->n_bitrates; i++)
2462 if (bitrates[i].flags & mandatory_flag)
2463 mandatory_rates |= BIT(i);
2464 return mandatory_rates;
2465 }
2466
2467 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2468 struct ieee80211_mgmt *mgmt,
2469 size_t len,
2470 struct ieee80211_rx_status *rx_status,
2471 struct ieee802_11_elems *elems)
2472 {
2473 struct ieee80211_local *local = sdata->local;
2474 int freq, clen;
2475 struct ieee80211_sta_bss *bss;
2476 struct sta_info *sta;
2477 struct ieee80211_channel *channel;
2478 u64 beacon_timestamp, rx_timestamp;
2479 u64 supp_rates = 0;
2480 bool beacon = ieee80211_is_beacon(mgmt->frame_control);
2481 enum ieee80211_band band = rx_status->band;
2482 DECLARE_MAC_BUF(mac);
2483 DECLARE_MAC_BUF(mac2);
2484
2485 if (elems->ds_params && elems->ds_params_len == 1)
2486 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
2487 else
2488 freq = rx_status->freq;
2489
2490 channel = ieee80211_get_channel(local->hw.wiphy, freq);
2491
2492 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2493 return;
2494
2495 if (ieee80211_vif_is_mesh(&sdata->vif) && elems->mesh_id &&
2496 elems->mesh_config && mesh_matches_local(elems, sdata)) {
2497 supp_rates = ieee80211_sta_get_rates(local, elems, band);
2498
2499 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
2500 mesh_peer_accepts_plinks(elems));
2501 }
2502
2503 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && elems->supp_rates &&
2504 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
2505 supp_rates = ieee80211_sta_get_rates(local, elems, band);
2506
2507 rcu_read_lock();
2508
2509 sta = sta_info_get(local, mgmt->sa);
2510 if (sta) {
2511 u64 prev_rates;
2512
2513 prev_rates = sta->supp_rates[band];
2514 /* make sure mandatory rates are always added */
2515 sta->supp_rates[band] = supp_rates |
2516 ieee80211_sta_get_mandatory_rates(local, band);
2517
2518 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2519 if (sta->supp_rates[band] != prev_rates)
2520 printk(KERN_DEBUG "%s: updated supp_rates set "
2521 "for %s based on beacon info (0x%llx | "
2522 "0x%llx -> 0x%llx)\n",
2523 sdata->dev->name, print_mac(mac, sta->addr),
2524 (unsigned long long) prev_rates,
2525 (unsigned long long) supp_rates,
2526 (unsigned long long) sta->supp_rates[band]);
2527 #endif
2528 } else {
2529 ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
2530 mgmt->sa, supp_rates);
2531 }
2532
2533 rcu_read_unlock();
2534 }
2535
2536 #ifdef CONFIG_MAC80211_MESH
2537 if (elems->mesh_config)
2538 bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id,
2539 elems->mesh_id_len, elems->mesh_config, freq);
2540 else
2541 #endif
2542 bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq,
2543 elems->ssid, elems->ssid_len);
2544 if (!bss) {
2545 #ifdef CONFIG_MAC80211_MESH
2546 if (elems->mesh_config)
2547 bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id,
2548 elems->mesh_id_len, elems->mesh_config,
2549 elems->mesh_config_len, freq);
2550 else
2551 #endif
2552 bss = ieee80211_rx_bss_add(sdata, mgmt->bssid, freq,
2553 elems->ssid, elems->ssid_len);
2554 if (!bss)
2555 return;
2556 } else {
2557 #if 0
2558 /* TODO: order by RSSI? */
2559 spin_lock_bh(&local->sta_bss_lock);
2560 list_move_tail(&bss->list, &local->sta_bss_list);
2561 spin_unlock_bh(&local->sta_bss_lock);
2562 #endif
2563 }
2564
2565 /* save the ERP value so that it is available at association time */
2566 if (elems->erp_info && elems->erp_info_len >= 1) {
2567 bss->erp_value = elems->erp_info[0];
2568 bss->has_erp_value = 1;
2569 }
2570
2571 bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
2572 bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
2573
2574 if (elems->tim) {
2575 struct ieee80211_tim_ie *tim_ie =
2576 (struct ieee80211_tim_ie *)elems->tim;
2577 bss->dtim_period = tim_ie->dtim_period;
2578 }
2579
2580 /* set default value for buggy APs */
2581 if (!elems->tim || bss->dtim_period == 0)
2582 bss->dtim_period = 1;
2583
2584 bss->supp_rates_len = 0;
2585 if (elems->supp_rates) {
2586 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2587 if (clen > elems->supp_rates_len)
2588 clen = elems->supp_rates_len;
2589 memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates,
2590 clen);
2591 bss->supp_rates_len += clen;
2592 }
2593 if (elems->ext_supp_rates) {
2594 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2595 if (clen > elems->ext_supp_rates_len)
2596 clen = elems->ext_supp_rates_len;
2597 memcpy(&bss->supp_rates[bss->supp_rates_len],
2598 elems->ext_supp_rates, clen);
2599 bss->supp_rates_len += clen;
2600 }
2601
2602 bss->band = band;
2603
2604 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
2605
2606 bss->timestamp = beacon_timestamp;
2607 bss->last_update = jiffies;
2608 bss->signal = rx_status->signal;
2609 bss->noise = rx_status->noise;
2610 bss->qual = rx_status->qual;
2611 if (!beacon)
2612 bss->last_probe_resp = jiffies;
2613 /*
2614 * In STA mode, the remaining parameters should not be overridden
2615 * by beacons because they're not necessarily accurate there.
2616 */
2617 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
2618 bss->last_probe_resp && beacon) {
2619 ieee80211_rx_bss_put(local, bss);
2620 return;
2621 }
2622
2623 if (bss->ies == NULL || bss->ies_len < elems->total_len) {
2624 kfree(bss->ies);
2625 bss->ies = kmalloc(elems->total_len, GFP_ATOMIC);
2626 }
2627 if (bss->ies) {
2628 memcpy(bss->ies, elems->ie_start, elems->total_len);
2629 bss->ies_len = elems->total_len;
2630 } else
2631 bss->ies_len = 0;
2632
2633 bss->wmm_used = elems->wmm_param || elems->wmm_info;
2634
2635 /* check if we need to merge IBSS */
2636 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
2637 !local->sta_sw_scanning && !local->sta_hw_scanning &&
2638 bss->capability & WLAN_CAPABILITY_IBSS &&
2639 bss->freq == local->oper_channel->center_freq &&
2640 elems->ssid_len == sdata->u.sta.ssid_len &&
2641 memcmp(elems->ssid, sdata->u.sta.ssid,
2642 sdata->u.sta.ssid_len) == 0) {
2643 if (rx_status->flag & RX_FLAG_TSFT) {
2644 /* in order for correct IBSS merging we need mactime
2645 *
2646 * since mactime is defined as the time the first data
2647 * symbol of the frame hits the PHY, and the timestamp
2648 * of the beacon is defined as "the time that the data
2649 * symbol containing the first bit of the timestamp is
2650 * transmitted to the PHY plus the transmitting STA’s
2651 * delays through its local PHY from the MAC-PHY
2652 * interface to its interface with the WM"
2653 * (802.11 11.1.2) - equals the time this bit arrives at
2654 * the receiver - we have to take into account the
2655 * offset between the two.
2656 * e.g: at 1 MBit that means mactime is 192 usec earlier
2657 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
2658 */
2659 int rate = local->hw.wiphy->bands[band]->
2660 bitrates[rx_status->rate_idx].bitrate;
2661 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
2662 } else if (local && local->ops && local->ops->get_tsf)
2663 /* second best option: get current TSF */
2664 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
2665 else
2666 /* can't merge without knowing the TSF */
2667 rx_timestamp = -1LLU;
2668 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2669 printk(KERN_DEBUG "RX beacon SA=%s BSSID="
2670 "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
2671 print_mac(mac, mgmt->sa),
2672 print_mac(mac2, mgmt->bssid),
2673 (unsigned long long)rx_timestamp,
2674 (unsigned long long)beacon_timestamp,
2675 (unsigned long long)(rx_timestamp - beacon_timestamp),
2676 jiffies);
2677 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2678 if (beacon_timestamp > rx_timestamp) {
2679 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2680 printk(KERN_DEBUG "%s: beacon TSF higher than "
2681 "local TSF - IBSS merge with BSSID %s\n",
2682 sdata->dev->name, print_mac(mac, mgmt->bssid));
2683 #endif
2684 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
2685 ieee80211_ibss_add_sta(sdata, NULL,
2686 mgmt->bssid, mgmt->sa,
2687 supp_rates);
2688 }
2689 }
2690
2691 ieee80211_rx_bss_put(local, bss);
2692 }
2693
2694
2695 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2696 struct ieee80211_mgmt *mgmt,
2697 size_t len,
2698 struct ieee80211_rx_status *rx_status)
2699 {
2700 size_t baselen;
2701 struct ieee802_11_elems elems;
2702 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2703
2704 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
2705 return; /* ignore ProbeResp to foreign address */
2706
2707 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2708 if (baselen > len)
2709 return;
2710
2711 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2712 &elems);
2713
2714 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2715
2716 /* direct probe may be part of the association flow */
2717 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
2718 &ifsta->request)) {
2719 printk(KERN_DEBUG "%s direct probe responded\n",
2720 sdata->dev->name);
2721 ieee80211_authenticate(sdata, ifsta);
2722 }
2723 }
2724
2725
2726 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2727 struct ieee80211_mgmt *mgmt,
2728 size_t len,
2729 struct ieee80211_rx_status *rx_status)
2730 {
2731 struct ieee80211_if_sta *ifsta;
2732 size_t baselen;
2733 struct ieee802_11_elems elems;
2734 struct ieee80211_local *local = sdata->local;
2735 struct ieee80211_conf *conf = &local->hw.conf;
2736 u32 changed = 0;
2737
2738 /* Process beacon from the current BSS */
2739 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2740 if (baselen > len)
2741 return;
2742
2743 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
2744
2745 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2746
2747 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2748 return;
2749 ifsta = &sdata->u.sta;
2750
2751 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
2752 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
2753 return;
2754
2755 /* Do not send changes to driver if we are scanning. This removes
2756 * requirement that a driver's bss_info_changed/conf_tx functions
2757 * need to be atomic.
2758 * This is really ugly code, we should rewrite scanning and make
2759 * all this more understandable for humans.
2760 */
2761 if (local->sta_sw_scanning || local->sta_hw_scanning)
2762 return;
2763
2764 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
2765 elems.wmm_param_len);
2766
2767 if (elems.erp_info && elems.erp_info_len >= 1)
2768 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
2769 else {
2770 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
2771 changed |= ieee80211_handle_protect_preamb(sdata, false,
2772 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
2773 }
2774
2775 if (elems.ht_cap_elem && elems.ht_info_elem &&
2776 elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
2777 struct ieee80211_ht_bss_info bss_info;
2778
2779 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2780 (struct ieee80211_ht_addt_info *)
2781 elems.ht_info_elem, &bss_info);
2782 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
2783 &bss_info);
2784 }
2785
2786 ieee80211_bss_info_change_notify(sdata, changed);
2787 }
2788
2789
2790 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
2791 struct ieee80211_if_sta *ifsta,
2792 struct ieee80211_mgmt *mgmt,
2793 size_t len,
2794 struct ieee80211_rx_status *rx_status)
2795 {
2796 struct ieee80211_local *local = sdata->local;
2797 int tx_last_beacon;
2798 struct sk_buff *skb;
2799 struct ieee80211_mgmt *resp;
2800 u8 *pos, *end;
2801 DECLARE_MAC_BUF(mac);
2802 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2803 DECLARE_MAC_BUF(mac2);
2804 DECLARE_MAC_BUF(mac3);
2805 #endif
2806
2807 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS ||
2808 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
2809 len < 24 + 2 || !ifsta->probe_resp)
2810 return;
2811
2812 if (local->ops->tx_last_beacon)
2813 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2814 else
2815 tx_last_beacon = 1;
2816
2817 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2818 printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
2819 "%s (tx_last_beacon=%d)\n",
2820 sdata->dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
2821 print_mac(mac3, mgmt->bssid), tx_last_beacon);
2822 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2823
2824 if (!tx_last_beacon)
2825 return;
2826
2827 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2828 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2829 return;
2830
2831 end = ((u8 *) mgmt) + len;
2832 pos = mgmt->u.probe_req.variable;
2833 if (pos[0] != WLAN_EID_SSID ||
2834 pos + 2 + pos[1] > end) {
2835 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2836 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2837 "from %s\n",
2838 sdata->dev->name, print_mac(mac, mgmt->sa));
2839 #endif
2840 return;
2841 }
2842 if (pos[1] != 0 &&
2843 (pos[1] != ifsta->ssid_len ||
2844 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
2845 /* Ignore ProbeReq for foreign SSID */
2846 return;
2847 }
2848
2849 /* Reply with ProbeResp */
2850 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
2851 if (!skb)
2852 return;
2853
2854 resp = (struct ieee80211_mgmt *) skb->data;
2855 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2856 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2857 printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
2858 sdata->dev->name, print_mac(mac, resp->da));
2859 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2860 ieee80211_sta_tx(sdata, skb, 0);
2861 }
2862
2863 static void ieee80211_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
2864 struct ieee80211_if_sta *ifsta,
2865 struct ieee80211_mgmt *mgmt,
2866 size_t len,
2867 struct ieee80211_rx_status *rx_status)
2868 {
2869 struct ieee80211_local *local = sdata->local;
2870
2871 /* all categories we currently handle have action_code */
2872 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2873 return;
2874
2875 switch (mgmt->u.action.category) {
2876 case WLAN_CATEGORY_SPECTRUM_MGMT:
2877 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2878 break;
2879 switch (mgmt->u.action.u.measurement.action_code) {
2880 case WLAN_ACTION_SPCT_MSR_REQ:
2881 if (len < (IEEE80211_MIN_ACTION_SIZE +
2882 sizeof(mgmt->u.action.u.measurement)))
2883 break;
2884 ieee80211_sta_process_measurement_req(sdata, mgmt, len);
2885 break;
2886 }
2887 break;
2888 case WLAN_CATEGORY_BACK:
2889 switch (mgmt->u.action.u.addba_req.action_code) {
2890 case WLAN_ACTION_ADDBA_REQ:
2891 if (len < (IEEE80211_MIN_ACTION_SIZE +
2892 sizeof(mgmt->u.action.u.addba_req)))
2893 break;
2894 ieee80211_sta_process_addba_request(local, mgmt, len);
2895 break;
2896 case WLAN_ACTION_ADDBA_RESP:
2897 if (len < (IEEE80211_MIN_ACTION_SIZE +
2898 sizeof(mgmt->u.action.u.addba_resp)))
2899 break;
2900 ieee80211_sta_process_addba_resp(local, mgmt, len);
2901 break;
2902 case WLAN_ACTION_DELBA:
2903 if (len < (IEEE80211_MIN_ACTION_SIZE +
2904 sizeof(mgmt->u.action.u.delba)))
2905 break;
2906 ieee80211_sta_process_delba(sdata, mgmt, len);
2907 break;
2908 }
2909 break;
2910 case PLINK_CATEGORY:
2911 if (ieee80211_vif_is_mesh(&sdata->vif))
2912 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
2913 break;
2914 case MESH_PATH_SEL_CATEGORY:
2915 if (ieee80211_vif_is_mesh(&sdata->vif))
2916 mesh_rx_path_sel_frame(sdata, mgmt, len);
2917 break;
2918 }
2919 }
2920
2921 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
2922 struct ieee80211_rx_status *rx_status)
2923 {
2924 struct ieee80211_local *local = sdata->local;
2925 struct ieee80211_if_sta *ifsta;
2926 struct ieee80211_mgmt *mgmt;
2927 u16 fc;
2928
2929 if (skb->len < 24)
2930 goto fail;
2931
2932 ifsta = &sdata->u.sta;
2933
2934 mgmt = (struct ieee80211_mgmt *) skb->data;
2935 fc = le16_to_cpu(mgmt->frame_control);
2936
2937 switch (fc & IEEE80211_FCTL_STYPE) {
2938 case IEEE80211_STYPE_PROBE_REQ:
2939 case IEEE80211_STYPE_PROBE_RESP:
2940 case IEEE80211_STYPE_BEACON:
2941 case IEEE80211_STYPE_ACTION:
2942 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2943 case IEEE80211_STYPE_AUTH:
2944 case IEEE80211_STYPE_ASSOC_RESP:
2945 case IEEE80211_STYPE_REASSOC_RESP:
2946 case IEEE80211_STYPE_DEAUTH:
2947 case IEEE80211_STYPE_DISASSOC:
2948 skb_queue_tail(&ifsta->skb_queue, skb);
2949 queue_work(local->hw.workqueue, &ifsta->work);
2950 return;
2951 }
2952
2953 fail:
2954 kfree_skb(skb);
2955 }
2956
2957 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2958 struct sk_buff *skb)
2959 {
2960 struct ieee80211_rx_status *rx_status;
2961 struct ieee80211_if_sta *ifsta;
2962 struct ieee80211_mgmt *mgmt;
2963 u16 fc;
2964
2965 ifsta = &sdata->u.sta;
2966
2967 rx_status = (struct ieee80211_rx_status *) skb->cb;
2968 mgmt = (struct ieee80211_mgmt *) skb->data;
2969 fc = le16_to_cpu(mgmt->frame_control);
2970
2971 switch (fc & IEEE80211_FCTL_STYPE) {
2972 case IEEE80211_STYPE_PROBE_REQ:
2973 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
2974 rx_status);
2975 break;
2976 case IEEE80211_STYPE_PROBE_RESP:
2977 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
2978 break;
2979 case IEEE80211_STYPE_BEACON:
2980 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2981 break;
2982 case IEEE80211_STYPE_AUTH:
2983 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2984 break;
2985 case IEEE80211_STYPE_ASSOC_RESP:
2986 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2987 break;
2988 case IEEE80211_STYPE_REASSOC_RESP:
2989 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2990 break;
2991 case IEEE80211_STYPE_DEAUTH:
2992 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2993 break;
2994 case IEEE80211_STYPE_DISASSOC:
2995 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2996 break;
2997 case IEEE80211_STYPE_ACTION:
2998 ieee80211_rx_mgmt_action(sdata, ifsta, mgmt, skb->len, rx_status);
2999 break;
3000 }
3001
3002 kfree_skb(skb);
3003 }
3004
3005
3006 ieee80211_rx_result
3007 ieee80211_sta_rx_scan(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
3008 struct ieee80211_rx_status *rx_status)
3009 {
3010 struct ieee80211_mgmt *mgmt;
3011 __le16 fc;
3012
3013 if (skb->len < 2)
3014 return RX_DROP_UNUSABLE;
3015
3016 mgmt = (struct ieee80211_mgmt *) skb->data;
3017 fc = mgmt->frame_control;
3018
3019 if (ieee80211_is_ctl(fc))
3020 return RX_CONTINUE;
3021
3022 if (skb->len < 24)
3023 return RX_DROP_MONITOR;
3024
3025 if (ieee80211_is_probe_resp(fc)) {
3026 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
3027 dev_kfree_skb(skb);
3028 return RX_QUEUED;
3029 }
3030
3031 if (ieee80211_is_beacon(fc)) {
3032 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3033 dev_kfree_skb(skb);
3034 return RX_QUEUED;
3035 }
3036
3037 return RX_CONTINUE;
3038 }
3039
3040
3041 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
3042 {
3043 struct ieee80211_local *local = sdata->local;
3044 int active = 0;
3045 struct sta_info *sta;
3046
3047 rcu_read_lock();
3048
3049 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3050 if (sta->sdata == sdata &&
3051 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
3052 jiffies)) {
3053 active++;
3054 break;
3055 }
3056 }
3057
3058 rcu_read_unlock();
3059
3060 return active;
3061 }
3062
3063
3064 static void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, unsigned long exp_time)
3065 {
3066 struct ieee80211_local *local = sdata->local;
3067 struct sta_info *sta, *tmp;
3068 LIST_HEAD(tmp_list);
3069 DECLARE_MAC_BUF(mac);
3070 unsigned long flags;
3071
3072 spin_lock_irqsave(&local->sta_lock, flags);
3073 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
3074 if (time_after(jiffies, sta->last_rx + exp_time)) {
3075 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3076 printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
3077 sdata->dev->name, print_mac(mac, sta->addr));
3078 #endif
3079 __sta_info_unlink(&sta);
3080 if (sta)
3081 list_add(&sta->list, &tmp_list);
3082 }
3083 spin_unlock_irqrestore(&local->sta_lock, flags);
3084
3085 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
3086 sta_info_destroy(sta);
3087 }
3088
3089
3090 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
3091 struct ieee80211_if_sta *ifsta)
3092 {
3093 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
3094
3095 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
3096 if (ieee80211_sta_active_ibss(sdata))
3097 return;
3098
3099 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
3100 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
3101 ieee80211_sta_req_scan(sdata, ifsta->ssid, ifsta->ssid_len);
3102 }
3103
3104
3105 #ifdef CONFIG_MAC80211_MESH
3106 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
3107 struct ieee80211_if_sta *ifsta)
3108 {
3109 bool free_plinks;
3110
3111 ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
3112 mesh_path_expire(sdata);
3113
3114 free_plinks = mesh_plink_availables(sdata);
3115 if (free_plinks != sdata->u.sta.accepting_plinks)
3116 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3117
3118 mod_timer(&ifsta->timer, jiffies +
3119 IEEE80211_MESH_HOUSEKEEPING_INTERVAL);
3120 }
3121
3122
3123 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
3124 {
3125 struct ieee80211_if_sta *ifsta;
3126 ifsta = &sdata->u.sta;
3127 ifsta->state = IEEE80211_STA_MLME_MESH_UP;
3128 ieee80211_sta_timer((unsigned long)sdata);
3129 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3130 }
3131 #endif
3132
3133
3134 void ieee80211_sta_timer(unsigned long data)
3135 {
3136 struct ieee80211_sub_if_data *sdata =
3137 (struct ieee80211_sub_if_data *) data;
3138 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3139 struct ieee80211_local *local = sdata->local;
3140
3141 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3142 queue_work(local->hw.workqueue, &ifsta->work);
3143 }
3144
3145 void ieee80211_sta_work(struct work_struct *work)
3146 {
3147 struct ieee80211_sub_if_data *sdata =
3148 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
3149 struct ieee80211_local *local = sdata->local;
3150 struct ieee80211_if_sta *ifsta;
3151 struct sk_buff *skb;
3152
3153 if (!netif_running(sdata->dev))
3154 return;
3155
3156 if (local->sta_sw_scanning || local->sta_hw_scanning)
3157 return;
3158
3159 if (WARN_ON(sdata->vif.type != IEEE80211_IF_TYPE_STA &&
3160 sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
3161 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
3162 return;
3163 ifsta = &sdata->u.sta;
3164
3165 while ((skb = skb_dequeue(&ifsta->skb_queue)))
3166 ieee80211_sta_rx_queued_mgmt(sdata, skb);
3167
3168 #ifdef CONFIG_MAC80211_MESH
3169 if (ifsta->preq_queue_len &&
3170 time_after(jiffies,
3171 ifsta->last_preq + msecs_to_jiffies(ifsta->mshcfg.dot11MeshHWMPpreqMinInterval)))
3172 mesh_path_start_discovery(sdata);
3173 #endif
3174
3175 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
3176 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
3177 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
3178 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
3179 if (ifsta->scan_ssid_len)
3180 ieee80211_sta_start_scan(sdata, ifsta->scan_ssid, ifsta->scan_ssid_len);
3181 else
3182 ieee80211_sta_start_scan(sdata, NULL, 0);
3183 return;
3184 }
3185
3186 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
3187 if (ieee80211_sta_config_auth(sdata, ifsta))
3188 return;
3189 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3190 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
3191 return;
3192
3193 switch (ifsta->state) {
3194 case IEEE80211_STA_MLME_DISABLED:
3195 break;
3196 case IEEE80211_STA_MLME_DIRECT_PROBE:
3197 ieee80211_direct_probe(sdata, ifsta);
3198 break;
3199 case IEEE80211_STA_MLME_AUTHENTICATE:
3200 ieee80211_authenticate(sdata, ifsta);
3201 break;
3202 case IEEE80211_STA_MLME_ASSOCIATE:
3203 ieee80211_associate(sdata, ifsta);
3204 break;
3205 case IEEE80211_STA_MLME_ASSOCIATED:
3206 ieee80211_associated(sdata, ifsta);
3207 break;
3208 case IEEE80211_STA_MLME_IBSS_SEARCH:
3209 ieee80211_sta_find_ibss(sdata, ifsta);
3210 break;
3211 case IEEE80211_STA_MLME_IBSS_JOINED:
3212 ieee80211_sta_merge_ibss(sdata, ifsta);
3213 break;
3214 #ifdef CONFIG_MAC80211_MESH
3215 case IEEE80211_STA_MLME_MESH_UP:
3216 ieee80211_mesh_housekeeping(sdata, ifsta);
3217 break;
3218 #endif
3219 default:
3220 WARN_ON(1);
3221 break;
3222 }
3223
3224 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
3225 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
3226 "mixed-cell disabled - disassociate\n", sdata->dev->name);
3227
3228 ieee80211_set_disassoc(sdata, ifsta, false, true,
3229 WLAN_REASON_UNSPECIFIED);
3230 }
3231 }
3232
3233
3234 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
3235 struct ieee80211_if_sta *ifsta)
3236 {
3237 struct ieee80211_local *local = sdata->local;
3238
3239 if (local->ops->reset_tsf) {
3240 /* Reset own TSF to allow time synchronization work. */
3241 local->ops->reset_tsf(local_to_hw(local));
3242 }
3243
3244 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
3245
3246
3247 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
3248 ifsta->auth_alg = WLAN_AUTH_OPEN;
3249 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
3250 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
3251 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
3252 ifsta->auth_alg = WLAN_AUTH_LEAP;
3253 else
3254 ifsta->auth_alg = WLAN_AUTH_OPEN;
3255 ifsta->auth_transaction = -1;
3256 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
3257 ifsta->assoc_scan_tries = 0;
3258 ifsta->direct_probe_tries = 0;
3259 ifsta->auth_tries = 0;
3260 ifsta->assoc_tries = 0;
3261 netif_carrier_off(sdata->dev);
3262 }
3263
3264
3265 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
3266 struct ieee80211_if_sta *ifsta)
3267 {
3268 struct ieee80211_local *local = sdata->local;
3269
3270 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3271 return;
3272
3273 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
3274 IEEE80211_STA_AUTO_BSSID_SEL)) &&
3275 (ifsta->flags & (IEEE80211_STA_SSID_SET |
3276 IEEE80211_STA_AUTO_SSID_SEL))) {
3277
3278 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
3279 ieee80211_set_disassoc(sdata, ifsta, true, true,
3280 WLAN_REASON_DEAUTH_LEAVING);
3281
3282 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3283 queue_work(local->hw.workqueue, &ifsta->work);
3284 }
3285 }
3286
3287 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
3288 const char *ssid, int ssid_len)
3289 {
3290 int tmp, hidden_ssid;
3291
3292 if (ssid_len == ifsta->ssid_len &&
3293 !memcmp(ifsta->ssid, ssid, ssid_len))
3294 return 1;
3295
3296 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
3297 return 0;
3298
3299 hidden_ssid = 1;
3300 tmp = ssid_len;
3301 while (tmp--) {
3302 if (ssid[tmp] != '\0') {
3303 hidden_ssid = 0;
3304 break;
3305 }
3306 }
3307
3308 if (hidden_ssid && ifsta->ssid_len == ssid_len)
3309 return 1;
3310
3311 if (ssid_len == 1 && ssid[0] == ' ')
3312 return 1;
3313
3314 return 0;
3315 }
3316
3317 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
3318 struct ieee80211_if_sta *ifsta)
3319 {
3320 struct ieee80211_local *local = sdata->local;
3321 struct ieee80211_sta_bss *bss, *selected = NULL;
3322 int top_rssi = 0, freq;
3323
3324 spin_lock_bh(&local->sta_bss_lock);
3325 freq = local->oper_channel->center_freq;
3326 list_for_each_entry(bss, &local->sta_bss_list, list) {
3327 if (!(bss->capability & WLAN_CAPABILITY_ESS))
3328 continue;
3329
3330 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
3331 IEEE80211_STA_AUTO_BSSID_SEL |
3332 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
3333 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
3334 !!sdata->default_key))
3335 continue;
3336
3337 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
3338 bss->freq != freq)
3339 continue;
3340
3341 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
3342 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
3343 continue;
3344
3345 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
3346 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
3347 continue;
3348
3349 if (!selected || top_rssi < bss->signal) {
3350 selected = bss;
3351 top_rssi = bss->signal;
3352 }
3353 }
3354 if (selected)
3355 atomic_inc(&selected->users);
3356 spin_unlock_bh(&local->sta_bss_lock);
3357
3358 if (selected) {
3359 ieee80211_set_freq(sdata, selected->freq);
3360 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
3361 ieee80211_sta_set_ssid(sdata, selected->ssid,
3362 selected->ssid_len);
3363 ieee80211_sta_set_bssid(sdata, selected->bssid);
3364 ieee80211_sta_def_wmm_params(sdata, selected, 0);
3365
3366 /* Send out direct probe if no probe resp was received or
3367 * the one we have is outdated
3368 */
3369 if (!selected->last_probe_resp ||
3370 time_after(jiffies, selected->last_probe_resp
3371 + IEEE80211_SCAN_RESULT_EXPIRE))
3372 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
3373 else
3374 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
3375
3376 ieee80211_rx_bss_put(local, selected);
3377 ieee80211_sta_reset_auth(sdata, ifsta);
3378 return 0;
3379 } else {
3380 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
3381 ifsta->assoc_scan_tries++;
3382 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
3383 ieee80211_sta_start_scan(sdata, NULL, 0);
3384 else
3385 ieee80211_sta_start_scan(sdata, ifsta->ssid,
3386 ifsta->ssid_len);
3387 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
3388 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3389 } else
3390 ifsta->state = IEEE80211_STA_MLME_DISABLED;
3391 }
3392 return -1;
3393 }
3394
3395
3396 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
3397 struct ieee80211_if_sta *ifsta)
3398 {
3399 struct ieee80211_local *local = sdata->local;
3400 struct ieee80211_sta_bss *bss;
3401 struct ieee80211_supported_band *sband;
3402 u8 bssid[ETH_ALEN], *pos;
3403 int i;
3404 int ret;
3405 DECLARE_MAC_BUF(mac);
3406
3407 #if 0
3408 /* Easier testing, use fixed BSSID. */
3409 memset(bssid, 0xfe, ETH_ALEN);
3410 #else
3411 /* Generate random, not broadcast, locally administered BSSID. Mix in
3412 * own MAC address to make sure that devices that do not have proper
3413 * random number generator get different BSSID. */
3414 get_random_bytes(bssid, ETH_ALEN);
3415 for (i = 0; i < ETH_ALEN; i++)
3416 bssid[i] ^= sdata->dev->dev_addr[i];
3417 bssid[0] &= ~0x01;
3418 bssid[0] |= 0x02;
3419 #endif
3420
3421 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
3422 sdata->dev->name, print_mac(mac, bssid));
3423
3424 bss = ieee80211_rx_bss_add(sdata, bssid,
3425 local->hw.conf.channel->center_freq,
3426 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
3427 if (!bss)
3428 return -ENOMEM;
3429
3430 bss->band = local->hw.conf.channel->band;
3431 sband = local->hw.wiphy->bands[bss->band];
3432
3433 if (local->hw.conf.beacon_int == 0)
3434 local->hw.conf.beacon_int = 100;
3435 bss->beacon_int = local->hw.conf.beacon_int;
3436 bss->last_update = jiffies;
3437 bss->capability = WLAN_CAPABILITY_IBSS;
3438
3439 if (sdata->default_key)
3440 bss->capability |= WLAN_CAPABILITY_PRIVACY;
3441 else
3442 sdata->drop_unencrypted = 0;
3443
3444 bss->supp_rates_len = sband->n_bitrates;
3445 pos = bss->supp_rates;
3446 for (i = 0; i < sband->n_bitrates; i++) {
3447 int rate = sband->bitrates[i].bitrate;
3448 *pos++ = (u8) (rate / 5);
3449 }
3450
3451 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
3452 ieee80211_rx_bss_put(local, bss);
3453 return ret;
3454 }
3455
3456
3457 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
3458 struct ieee80211_if_sta *ifsta)
3459 {
3460 struct ieee80211_local *local = sdata->local;
3461 struct ieee80211_sta_bss *bss;
3462 int found = 0;
3463 u8 bssid[ETH_ALEN];
3464 int active_ibss;
3465 DECLARE_MAC_BUF(mac);
3466 DECLARE_MAC_BUF(mac2);
3467
3468 if (ifsta->ssid_len == 0)
3469 return -EINVAL;
3470
3471 active_ibss = ieee80211_sta_active_ibss(sdata);
3472 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3473 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
3474 sdata->dev->name, active_ibss);
3475 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3476 spin_lock_bh(&local->sta_bss_lock);
3477 list_for_each_entry(bss, &local->sta_bss_list, list) {
3478 if (ifsta->ssid_len != bss->ssid_len ||
3479 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
3480 || !(bss->capability & WLAN_CAPABILITY_IBSS))
3481 continue;
3482 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3483 printk(KERN_DEBUG " bssid=%s found\n",
3484 print_mac(mac, bss->bssid));
3485 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3486 memcpy(bssid, bss->bssid, ETH_ALEN);
3487 found = 1;
3488 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
3489 break;
3490 }
3491 spin_unlock_bh(&local->sta_bss_lock);
3492
3493 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3494 if (found)
3495 printk(KERN_DEBUG " sta_find_ibss: selected %s current "
3496 "%s\n", print_mac(mac, bssid),
3497 print_mac(mac2, ifsta->bssid));
3498 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3499
3500 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3501 int ret;
3502 int search_freq;
3503
3504 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
3505 search_freq = bss->freq;
3506 else
3507 search_freq = local->hw.conf.channel->center_freq;
3508
3509 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
3510 ifsta->ssid, ifsta->ssid_len);
3511 if (!bss)
3512 goto dont_join;
3513
3514 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
3515 " based on configured SSID\n",
3516 sdata->dev->name, print_mac(mac, bssid));
3517 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
3518 ieee80211_rx_bss_put(local, bss);
3519 return ret;
3520 }
3521
3522 dont_join:
3523 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3524 printk(KERN_DEBUG " did not try to join ibss\n");
3525 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3526
3527 /* Selected IBSS not found in current scan results - try to scan */
3528 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
3529 !ieee80211_sta_active_ibss(sdata)) {
3530 mod_timer(&ifsta->timer, jiffies +
3531 IEEE80211_IBSS_MERGE_INTERVAL);
3532 } else if (time_after(jiffies, local->last_scan_completed +
3533 IEEE80211_SCAN_INTERVAL)) {
3534 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
3535 "join\n", sdata->dev->name);
3536 return ieee80211_sta_req_scan(sdata, ifsta->ssid,
3537 ifsta->ssid_len);
3538 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
3539 int interval = IEEE80211_SCAN_INTERVAL;
3540
3541 if (time_after(jiffies, ifsta->ibss_join_req +
3542 IEEE80211_IBSS_JOIN_TIMEOUT)) {
3543 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
3544 (!(local->oper_channel->flags &
3545 IEEE80211_CHAN_NO_IBSS)))
3546 return ieee80211_sta_create_ibss(sdata, ifsta);
3547 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
3548 printk(KERN_DEBUG "%s: IBSS not allowed on"
3549 " %d MHz\n", sdata->dev->name,
3550 local->hw.conf.channel->center_freq);
3551 }
3552
3553 /* No IBSS found - decrease scan interval and continue
3554 * scanning. */
3555 interval = IEEE80211_SCAN_INTERVAL_SLOW;
3556 }
3557
3558 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
3559 mod_timer(&ifsta->timer, jiffies + interval);
3560 return 0;
3561 }
3562
3563 return 0;
3564 }
3565
3566
3567 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
3568 {
3569 struct ieee80211_if_sta *ifsta;
3570 int res;
3571
3572 if (len > IEEE80211_MAX_SSID_LEN)
3573 return -EINVAL;
3574
3575 ifsta = &sdata->u.sta;
3576
3577 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
3578 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
3579 memcpy(ifsta->ssid, ssid, len);
3580 ifsta->ssid_len = len;
3581 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
3582
3583 res = 0;
3584 /*
3585 * Hack! MLME code needs to be cleaned up to have different
3586 * entry points for configuration and internal selection change
3587 */
3588 if (netif_running(sdata->dev))
3589 res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
3590 if (res) {
3591 printk(KERN_DEBUG "%s: Failed to config new SSID to "
3592 "the low-level driver\n", sdata->dev->name);
3593 return res;
3594 }
3595 }
3596
3597 if (len)
3598 ifsta->flags |= IEEE80211_STA_SSID_SET;
3599 else
3600 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
3601
3602 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3603 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
3604 ifsta->ibss_join_req = jiffies;
3605 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
3606 return ieee80211_sta_find_ibss(sdata, ifsta);
3607 }
3608
3609 return 0;
3610 }
3611
3612
3613 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
3614 {
3615 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3616 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
3617 *len = ifsta->ssid_len;
3618 return 0;
3619 }
3620
3621
3622 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
3623 {
3624 struct ieee80211_if_sta *ifsta;
3625 int res;
3626
3627 ifsta = &sdata->u.sta;
3628
3629 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3630 memcpy(ifsta->bssid, bssid, ETH_ALEN);
3631 res = 0;
3632 /*
3633 * Hack! See also ieee80211_sta_set_ssid.
3634 */
3635 if (netif_running(sdata->dev))
3636 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
3637 if (res) {
3638 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
3639 "the low-level driver\n", sdata->dev->name);
3640 return res;
3641 }
3642 }
3643
3644 if (is_valid_ether_addr(bssid))
3645 ifsta->flags |= IEEE80211_STA_BSSID_SET;
3646 else
3647 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
3648
3649 return 0;
3650 }
3651
3652
3653 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
3654 struct ieee80211_sub_if_data *sdata,
3655 int powersave)
3656 {
3657 struct sk_buff *skb;
3658 struct ieee80211_hdr *nullfunc;
3659 __le16 fc;
3660
3661 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
3662 if (!skb) {
3663 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
3664 "frame\n", sdata->dev->name);
3665 return;
3666 }
3667 skb_reserve(skb, local->hw.extra_tx_headroom);
3668
3669 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
3670 memset(nullfunc, 0, 24);
3671 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
3672 IEEE80211_FCTL_TODS);
3673 if (powersave)
3674 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
3675 nullfunc->frame_control = fc;
3676 memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
3677 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
3678 memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
3679
3680 ieee80211_sta_tx(sdata, skb, 0);
3681 }
3682
3683
3684 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3685 {
3686 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
3687 ieee80211_vif_is_mesh(&sdata->vif))
3688 ieee80211_sta_timer((unsigned long)sdata);
3689 }
3690
3691 void ieee80211_scan_completed(struct ieee80211_hw *hw)
3692 {
3693 struct ieee80211_local *local = hw_to_local(hw);
3694 struct net_device *dev = local->scan_dev;
3695 struct ieee80211_sub_if_data *sdata;
3696 union iwreq_data wrqu;
3697
3698 local->last_scan_completed = jiffies;
3699 memset(&wrqu, 0, sizeof(wrqu));
3700 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
3701
3702 if (local->sta_hw_scanning) {
3703 local->sta_hw_scanning = 0;
3704 if (ieee80211_hw_config(local))
3705 printk(KERN_DEBUG "%s: failed to restore operational "
3706 "channel after scan\n", dev->name);
3707 /* Restart STA timer for HW scan case */
3708 rcu_read_lock();
3709 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3710 ieee80211_restart_sta_timer(sdata);
3711 rcu_read_unlock();
3712
3713 goto done;
3714 }
3715
3716 local->sta_sw_scanning = 0;
3717 if (ieee80211_hw_config(local))
3718 printk(KERN_DEBUG "%s: failed to restore operational "
3719 "channel after scan\n", dev->name);
3720
3721
3722 netif_tx_lock_bh(local->mdev);
3723 netif_addr_lock(local->mdev);
3724 local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
3725 local->ops->configure_filter(local_to_hw(local),
3726 FIF_BCN_PRBRESP_PROMISC,
3727 &local->filter_flags,
3728 local->mdev->mc_count,
3729 local->mdev->mc_list);
3730
3731 netif_addr_unlock(local->mdev);
3732 netif_tx_unlock_bh(local->mdev);
3733
3734 rcu_read_lock();
3735 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3736 /* Tell AP we're back */
3737 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
3738 sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED)
3739 ieee80211_send_nullfunc(local, sdata, 0);
3740
3741 ieee80211_restart_sta_timer(sdata);
3742
3743 netif_wake_queue(sdata->dev);
3744 }
3745 rcu_read_unlock();
3746
3747 done:
3748 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3749 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
3750 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3751 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
3752 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
3753 !ieee80211_sta_active_ibss(sdata)))
3754 ieee80211_sta_find_ibss(sdata, ifsta);
3755 }
3756 }
3757 EXPORT_SYMBOL(ieee80211_scan_completed);
3758
3759 void ieee80211_sta_scan_work(struct work_struct *work)
3760 {
3761 struct ieee80211_local *local =
3762 container_of(work, struct ieee80211_local, scan_work.work);
3763 struct net_device *dev = local->scan_dev;
3764 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3765 struct ieee80211_supported_band *sband;
3766 struct ieee80211_channel *chan;
3767 int skip;
3768 unsigned long next_delay = 0;
3769
3770 if (!local->sta_sw_scanning)
3771 return;
3772
3773 switch (local->scan_state) {
3774 case SCAN_SET_CHANNEL:
3775 /*
3776 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
3777 * after we successfully scanned the last channel of the last
3778 * band (and the last band is supported by the hw)
3779 */
3780 if (local->scan_band < IEEE80211_NUM_BANDS)
3781 sband = local->hw.wiphy->bands[local->scan_band];
3782 else
3783 sband = NULL;
3784
3785 /*
3786 * If we are at an unsupported band and have more bands
3787 * left to scan, advance to the next supported one.
3788 */
3789 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
3790 local->scan_band++;
3791 sband = local->hw.wiphy->bands[local->scan_band];
3792 local->scan_channel_idx = 0;
3793 }
3794
3795 /* if no more bands/channels left, complete scan */
3796 if (!sband || local->scan_channel_idx >= sband->n_channels) {
3797 ieee80211_scan_completed(local_to_hw(local));
3798 return;
3799 }
3800 skip = 0;
3801 chan = &sband->channels[local->scan_channel_idx];
3802
3803 if (chan->flags & IEEE80211_CHAN_DISABLED ||
3804 (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3805 chan->flags & IEEE80211_CHAN_NO_IBSS))
3806 skip = 1;
3807
3808 if (!skip) {
3809 local->scan_channel = chan;
3810 if (ieee80211_hw_config(local)) {
3811 printk(KERN_DEBUG "%s: failed to set freq to "
3812 "%d MHz for scan\n", dev->name,
3813 chan->center_freq);
3814 skip = 1;
3815 }
3816 }
3817
3818 /* advance state machine to next channel/band */
3819 local->scan_channel_idx++;
3820 if (local->scan_channel_idx >= sband->n_channels) {
3821 /*
3822 * scan_band may end up == IEEE80211_NUM_BANDS, but
3823 * we'll catch that case above and complete the scan
3824 * if that is the case.
3825 */
3826 local->scan_band++;
3827 local->scan_channel_idx = 0;
3828 }
3829
3830 if (skip)
3831 break;
3832
3833 next_delay = IEEE80211_PROBE_DELAY +
3834 usecs_to_jiffies(local->hw.channel_change_time);
3835 local->scan_state = SCAN_SEND_PROBE;
3836 break;
3837 case SCAN_SEND_PROBE:
3838 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
3839 local->scan_state = SCAN_SET_CHANNEL;
3840
3841 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
3842 break;
3843 ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
3844 local->scan_ssid_len);
3845 next_delay = IEEE80211_CHANNEL_TIME;
3846 break;
3847 }
3848
3849 if (local->sta_sw_scanning)
3850 queue_delayed_work(local->hw.workqueue, &local->scan_work,
3851 next_delay);
3852 }
3853
3854
3855 static int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata,
3856 u8 *ssid, size_t ssid_len)
3857 {
3858 struct ieee80211_local *local = scan_sdata->local;
3859 struct ieee80211_sub_if_data *sdata;
3860
3861 if (ssid_len > IEEE80211_MAX_SSID_LEN)
3862 return -EINVAL;
3863
3864 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
3865 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
3866 * BSSID: MACAddress
3867 * SSID
3868 * ScanType: ACTIVE, PASSIVE
3869 * ProbeDelay: delay (in microseconds) to be used prior to transmitting
3870 * a Probe frame during active scanning
3871 * ChannelList
3872 * MinChannelTime (>= ProbeDelay), in TU
3873 * MaxChannelTime: (>= MinChannelTime), in TU
3874 */
3875
3876 /* MLME-SCAN.confirm
3877 * BSSDescriptionSet
3878 * ResultCode: SUCCESS, INVALID_PARAMETERS
3879 */
3880
3881 if (local->sta_sw_scanning || local->sta_hw_scanning) {
3882 if (local->scan_dev == scan_sdata->dev)
3883 return 0;
3884 return -EBUSY;
3885 }
3886
3887 if (local->ops->hw_scan) {
3888 int rc = local->ops->hw_scan(local_to_hw(local),
3889 ssid, ssid_len);
3890 if (!rc) {
3891 local->sta_hw_scanning = 1;
3892 local->scan_dev = scan_sdata->dev;
3893 }
3894 return rc;
3895 }
3896
3897 local->sta_sw_scanning = 1;
3898
3899 rcu_read_lock();
3900 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3901 netif_stop_queue(sdata->dev);
3902 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
3903 (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED))
3904 ieee80211_send_nullfunc(local, sdata, 1);
3905 }
3906 rcu_read_unlock();
3907
3908 if (ssid) {
3909 local->scan_ssid_len = ssid_len;
3910 memcpy(local->scan_ssid, ssid, ssid_len);
3911 } else
3912 local->scan_ssid_len = 0;
3913 local->scan_state = SCAN_SET_CHANNEL;
3914 local->scan_channel_idx = 0;
3915 local->scan_band = IEEE80211_BAND_2GHZ;
3916 local->scan_dev = scan_sdata->dev;
3917
3918 netif_addr_lock_bh(local->mdev);
3919 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
3920 local->ops->configure_filter(local_to_hw(local),
3921 FIF_BCN_PRBRESP_PROMISC,
3922 &local->filter_flags,
3923 local->mdev->mc_count,
3924 local->mdev->mc_list);
3925 netif_addr_unlock_bh(local->mdev);
3926
3927 /* TODO: start scan as soon as all nullfunc frames are ACKed */
3928 queue_delayed_work(local->hw.workqueue, &local->scan_work,
3929 IEEE80211_CHANNEL_TIME);
3930
3931 return 0;
3932 }
3933
3934
3935 int ieee80211_sta_req_scan(struct ieee80211_sub_if_data *sdata, u8 *ssid, size_t ssid_len)
3936 {
3937 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3938 struct ieee80211_local *local = sdata->local;
3939
3940 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3941 return ieee80211_sta_start_scan(sdata, ssid, ssid_len);
3942
3943 if (local->sta_sw_scanning || local->sta_hw_scanning) {
3944 if (local->scan_dev == sdata->dev)
3945 return 0;
3946 return -EBUSY;
3947 }
3948
3949 ifsta->scan_ssid_len = ssid_len;
3950 if (ssid_len)
3951 memcpy(ifsta->scan_ssid, ssid, ssid_len);
3952 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
3953 queue_work(local->hw.workqueue, &ifsta->work);
3954 return 0;
3955 }
3956
3957
3958 static void ieee80211_sta_add_scan_ies(struct iw_request_info *info,
3959 struct ieee80211_sta_bss *bss,
3960 char **current_ev, char *end_buf)
3961 {
3962 u8 *pos, *end, *next;
3963 struct iw_event iwe;
3964
3965 if (bss == NULL || bss->ies == NULL)
3966 return;
3967
3968 /*
3969 * If needed, fragment the IEs buffer (at IE boundaries) into short
3970 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
3971 */
3972 pos = bss->ies;
3973 end = pos + bss->ies_len;
3974
3975 while (end - pos > IW_GENERIC_IE_MAX) {
3976 next = pos + 2 + pos[1];
3977 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
3978 next = next + 2 + next[1];
3979
3980 memset(&iwe, 0, sizeof(iwe));
3981 iwe.cmd = IWEVGENIE;
3982 iwe.u.data.length = next - pos;
3983 *current_ev = iwe_stream_add_point(info, *current_ev,
3984 end_buf, &iwe, pos);
3985
3986 pos = next;
3987 }
3988
3989 if (end > pos) {
3990 memset(&iwe, 0, sizeof(iwe));
3991 iwe.cmd = IWEVGENIE;
3992 iwe.u.data.length = end - pos;
3993 *current_ev = iwe_stream_add_point(info, *current_ev,
3994 end_buf, &iwe, pos);
3995 }
3996 }
3997
3998
3999 static char *
4000 ieee80211_sta_scan_result(struct ieee80211_local *local,
4001 struct iw_request_info *info,
4002 struct ieee80211_sta_bss *bss,
4003 char *current_ev, char *end_buf)
4004 {
4005 struct iw_event iwe;
4006
4007 if (time_after(jiffies,
4008 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
4009 return current_ev;
4010
4011 memset(&iwe, 0, sizeof(iwe));
4012 iwe.cmd = SIOCGIWAP;
4013 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
4014 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
4015 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4016 IW_EV_ADDR_LEN);
4017
4018 memset(&iwe, 0, sizeof(iwe));
4019 iwe.cmd = SIOCGIWESSID;
4020 if (bss_mesh_cfg(bss)) {
4021 iwe.u.data.length = bss_mesh_id_len(bss);
4022 iwe.u.data.flags = 1;
4023 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4024 &iwe, bss_mesh_id(bss));
4025 } else {
4026 iwe.u.data.length = bss->ssid_len;
4027 iwe.u.data.flags = 1;
4028 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4029 &iwe, bss->ssid);
4030 }
4031
4032 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
4033 || bss_mesh_cfg(bss)) {
4034 memset(&iwe, 0, sizeof(iwe));
4035 iwe.cmd = SIOCGIWMODE;
4036 if (bss_mesh_cfg(bss))
4037 iwe.u.mode = IW_MODE_MESH;
4038 else if (bss->capability & WLAN_CAPABILITY_ESS)
4039 iwe.u.mode = IW_MODE_MASTER;
4040 else
4041 iwe.u.mode = IW_MODE_ADHOC;
4042 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
4043 &iwe, IW_EV_UINT_LEN);
4044 }
4045
4046 memset(&iwe, 0, sizeof(iwe));
4047 iwe.cmd = SIOCGIWFREQ;
4048 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
4049 iwe.u.freq.e = 0;
4050 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4051 IW_EV_FREQ_LEN);
4052
4053 memset(&iwe, 0, sizeof(iwe));
4054 iwe.cmd = SIOCGIWFREQ;
4055 iwe.u.freq.m = bss->freq;
4056 iwe.u.freq.e = 6;
4057 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4058 IW_EV_FREQ_LEN);
4059 memset(&iwe, 0, sizeof(iwe));
4060 iwe.cmd = IWEVQUAL;
4061 iwe.u.qual.qual = bss->qual;
4062 iwe.u.qual.level = bss->signal;
4063 iwe.u.qual.noise = bss->noise;
4064 iwe.u.qual.updated = local->wstats_flags;
4065 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4066 IW_EV_QUAL_LEN);
4067
4068 memset(&iwe, 0, sizeof(iwe));
4069 iwe.cmd = SIOCGIWENCODE;
4070 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
4071 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
4072 else
4073 iwe.u.data.flags = IW_ENCODE_DISABLED;
4074 iwe.u.data.length = 0;
4075 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4076 &iwe, "");
4077
4078 ieee80211_sta_add_scan_ies(info, bss, &current_ev, end_buf);
4079
4080 if (bss && bss->supp_rates_len > 0) {
4081 /* display all supported rates in readable format */
4082 char *p = current_ev + iwe_stream_lcp_len(info);
4083 int i;
4084
4085 memset(&iwe, 0, sizeof(iwe));
4086 iwe.cmd = SIOCGIWRATE;
4087 /* Those two flags are ignored... */
4088 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
4089
4090 for (i = 0; i < bss->supp_rates_len; i++) {
4091 iwe.u.bitrate.value = ((bss->supp_rates[i] &
4092 0x7f) * 500000);
4093 p = iwe_stream_add_value(info, current_ev, p,
4094 end_buf, &iwe, IW_EV_PARAM_LEN);
4095 }
4096 current_ev = p;
4097 }
4098
4099 if (bss) {
4100 char *buf;
4101 buf = kmalloc(30, GFP_ATOMIC);
4102 if (buf) {
4103 memset(&iwe, 0, sizeof(iwe));
4104 iwe.cmd = IWEVCUSTOM;
4105 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
4106 iwe.u.data.length = strlen(buf);
4107 current_ev = iwe_stream_add_point(info, current_ev,
4108 end_buf,
4109 &iwe, buf);
4110 memset(&iwe, 0, sizeof(iwe));
4111 iwe.cmd = IWEVCUSTOM;
4112 sprintf(buf, " Last beacon: %dms ago",
4113 jiffies_to_msecs(jiffies - bss->last_update));
4114 iwe.u.data.length = strlen(buf);
4115 current_ev = iwe_stream_add_point(info, current_ev,
4116 end_buf, &iwe, buf);
4117 kfree(buf);
4118 }
4119 }
4120
4121 if (bss_mesh_cfg(bss)) {
4122 char *buf;
4123 u8 *cfg = bss_mesh_cfg(bss);
4124 buf = kmalloc(50, GFP_ATOMIC);
4125 if (buf) {
4126 memset(&iwe, 0, sizeof(iwe));
4127 iwe.cmd = IWEVCUSTOM;
4128 sprintf(buf, "Mesh network (version %d)", cfg[0]);
4129 iwe.u.data.length = strlen(buf);
4130 current_ev = iwe_stream_add_point(info, current_ev,
4131 end_buf,
4132 &iwe, buf);
4133 sprintf(buf, "Path Selection Protocol ID: "
4134 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
4135 cfg[4]);
4136 iwe.u.data.length = strlen(buf);
4137 current_ev = iwe_stream_add_point(info, current_ev,
4138 end_buf,
4139 &iwe, buf);
4140 sprintf(buf, "Path Selection Metric ID: "
4141 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
4142 cfg[8]);
4143 iwe.u.data.length = strlen(buf);
4144 current_ev = iwe_stream_add_point(info, current_ev,
4145 end_buf,
4146 &iwe, buf);
4147 sprintf(buf, "Congestion Control Mode ID: "
4148 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
4149 cfg[11], cfg[12]);
4150 iwe.u.data.length = strlen(buf);
4151 current_ev = iwe_stream_add_point(info, current_ev,
4152 end_buf,
4153 &iwe, buf);
4154 sprintf(buf, "Channel Precedence: "
4155 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
4156 cfg[15], cfg[16]);
4157 iwe.u.data.length = strlen(buf);
4158 current_ev = iwe_stream_add_point(info, current_ev,
4159 end_buf,
4160 &iwe, buf);
4161 kfree(buf);
4162 }
4163 }
4164
4165 return current_ev;
4166 }
4167
4168
4169 int ieee80211_sta_scan_results(struct ieee80211_local *local,
4170 struct iw_request_info *info,
4171 char *buf, size_t len)
4172 {
4173 char *current_ev = buf;
4174 char *end_buf = buf + len;
4175 struct ieee80211_sta_bss *bss;
4176
4177 spin_lock_bh(&local->sta_bss_lock);
4178 list_for_each_entry(bss, &local->sta_bss_list, list) {
4179 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
4180 spin_unlock_bh(&local->sta_bss_lock);
4181 return -E2BIG;
4182 }
4183 current_ev = ieee80211_sta_scan_result(local, info, bss,
4184 current_ev, end_buf);
4185 }
4186 spin_unlock_bh(&local->sta_bss_lock);
4187 return current_ev - buf;
4188 }
4189
4190
4191 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
4192 {
4193 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4194
4195 kfree(ifsta->extra_ie);
4196 if (len == 0) {
4197 ifsta->extra_ie = NULL;
4198 ifsta->extra_ie_len = 0;
4199 return 0;
4200 }
4201 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
4202 if (!ifsta->extra_ie) {
4203 ifsta->extra_ie_len = 0;
4204 return -ENOMEM;
4205 }
4206 memcpy(ifsta->extra_ie, ie, len);
4207 ifsta->extra_ie_len = len;
4208 return 0;
4209 }
4210
4211
4212 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
4213 struct sk_buff *skb, u8 *bssid,
4214 u8 *addr, u64 supp_rates)
4215 {
4216 struct ieee80211_local *local = sdata->local;
4217 struct sta_info *sta;
4218 DECLARE_MAC_BUF(mac);
4219 int band = local->hw.conf.channel->band;
4220
4221 /* TODO: Could consider removing the least recently used entry and
4222 * allow new one to be added. */
4223 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
4224 if (net_ratelimit()) {
4225 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
4226 "entry %s\n", sdata->dev->name, print_mac(mac, addr));
4227 }
4228 return NULL;
4229 }
4230
4231 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
4232 return NULL;
4233
4234 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
4235 printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
4236 wiphy_name(local->hw.wiphy), print_mac(mac, addr), sdata->dev->name);
4237 #endif
4238
4239 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
4240 if (!sta)
4241 return NULL;
4242
4243 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
4244
4245 /* make sure mandatory rates are always added */
4246 sta->supp_rates[band] = supp_rates |
4247 ieee80211_sta_get_mandatory_rates(local, band);
4248
4249 rate_control_rate_init(sta, local);
4250
4251 if (sta_info_insert(sta))
4252 return NULL;
4253
4254 return sta;
4255 }
4256
4257
4258 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
4259 {
4260 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4261
4262 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
4263 sdata->dev->name, reason);
4264
4265 if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
4266 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
4267 return -EINVAL;
4268
4269 ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
4270 return 0;
4271 }
4272
4273
4274 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
4275 {
4276 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4277
4278 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
4279 sdata->dev->name, reason);
4280
4281 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4282 return -EINVAL;
4283
4284 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
4285 return -1;
4286
4287 ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
4288 return 0;
4289 }
4290
4291 void ieee80211_notify_mac(struct ieee80211_hw *hw,
4292 enum ieee80211_notification_types notif_type)
4293 {
4294 struct ieee80211_local *local = hw_to_local(hw);
4295 struct ieee80211_sub_if_data *sdata;
4296
4297 switch (notif_type) {
4298 case IEEE80211_NOTIFY_RE_ASSOC:
4299 rcu_read_lock();
4300 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4301 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4302 continue;
4303
4304 ieee80211_sta_req_auth(sdata, &sdata->u.sta);
4305 }
4306 rcu_read_unlock();
4307 break;
4308 }
4309 }
4310 EXPORT_SYMBOL(ieee80211_notify_mac);
Linux kernel - Deliverables
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