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mac80211: fix action frame length checks
[mirror_ubuntu-bionic-kernel.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 void ieee802_11_parse_elems(u8 *start, size_t len,
95 struct ieee802_11_elems *elems)
96 {
97 size_t left = len;
98 u8 *pos = start;
99
100 memset(elems, 0, sizeof(*elems));
101 elems->ie_start = start;
102 elems->total_len = len;
103
104 while (left >= 2) {
105 u8 id, elen;
106
107 id = *pos++;
108 elen = *pos++;
109 left -= 2;
110
111 if (elen > left)
112 return;
113
114 switch (id) {
115 case WLAN_EID_SSID:
116 elems->ssid = pos;
117 elems->ssid_len = elen;
118 break;
119 case WLAN_EID_SUPP_RATES:
120 elems->supp_rates = pos;
121 elems->supp_rates_len = elen;
122 break;
123 case WLAN_EID_FH_PARAMS:
124 elems->fh_params = pos;
125 elems->fh_params_len = elen;
126 break;
127 case WLAN_EID_DS_PARAMS:
128 elems->ds_params = pos;
129 elems->ds_params_len = elen;
130 break;
131 case WLAN_EID_CF_PARAMS:
132 elems->cf_params = pos;
133 elems->cf_params_len = elen;
134 break;
135 case WLAN_EID_TIM:
136 elems->tim = pos;
137 elems->tim_len = elen;
138 break;
139 case WLAN_EID_IBSS_PARAMS:
140 elems->ibss_params = pos;
141 elems->ibss_params_len = elen;
142 break;
143 case WLAN_EID_CHALLENGE:
144 elems->challenge = pos;
145 elems->challenge_len = elen;
146 break;
147 case WLAN_EID_WPA:
148 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
149 pos[2] == 0xf2) {
150 /* Microsoft OUI (00:50:F2) */
151 if (pos[3] == 1) {
152 /* OUI Type 1 - WPA IE */
153 elems->wpa = pos;
154 elems->wpa_len = elen;
155 } else if (elen >= 5 && pos[3] == 2) {
156 if (pos[4] == 0) {
157 elems->wmm_info = pos;
158 elems->wmm_info_len = elen;
159 } else if (pos[4] == 1) {
160 elems->wmm_param = pos;
161 elems->wmm_param_len = elen;
162 }
163 }
164 }
165 break;
166 case WLAN_EID_RSN:
167 elems->rsn = pos;
168 elems->rsn_len = elen;
169 break;
170 case WLAN_EID_ERP_INFO:
171 elems->erp_info = pos;
172 elems->erp_info_len = elen;
173 break;
174 case WLAN_EID_EXT_SUPP_RATES:
175 elems->ext_supp_rates = pos;
176 elems->ext_supp_rates_len = elen;
177 break;
178 case WLAN_EID_HT_CAPABILITY:
179 elems->ht_cap_elem = pos;
180 elems->ht_cap_elem_len = elen;
181 break;
182 case WLAN_EID_HT_EXTRA_INFO:
183 elems->ht_info_elem = pos;
184 elems->ht_info_elem_len = elen;
185 break;
186 case WLAN_EID_MESH_ID:
187 elems->mesh_id = pos;
188 elems->mesh_id_len = elen;
189 break;
190 case WLAN_EID_MESH_CONFIG:
191 elems->mesh_config = pos;
192 elems->mesh_config_len = elen;
193 break;
194 case WLAN_EID_PEER_LINK:
195 elems->peer_link = pos;
196 elems->peer_link_len = elen;
197 break;
198 case WLAN_EID_PREQ:
199 elems->preq = pos;
200 elems->preq_len = elen;
201 break;
202 case WLAN_EID_PREP:
203 elems->prep = pos;
204 elems->prep_len = elen;
205 break;
206 case WLAN_EID_PERR:
207 elems->perr = pos;
208 elems->perr_len = elen;
209 break;
210 case WLAN_EID_CHANNEL_SWITCH:
211 elems->ch_switch_elem = pos;
212 elems->ch_switch_elem_len = elen;
213 break;
214 case WLAN_EID_QUIET:
215 if (!elems->quiet_elem) {
216 elems->quiet_elem = pos;
217 elems->quiet_elem_len = elen;
218 }
219 elems->num_of_quiet_elem++;
220 break;
221 case WLAN_EID_COUNTRY:
222 elems->country_elem = pos;
223 elems->country_elem_len = elen;
224 break;
225 case WLAN_EID_PWR_CONSTRAINT:
226 elems->pwr_constr_elem = pos;
227 elems->pwr_constr_elem_len = elen;
228 break;
229 default:
230 break;
231 }
232
233 left -= elen;
234 pos += elen;
235 }
236 }
237
238
239 static u8 * ieee80211_bss_get_ie(struct ieee80211_sta_bss *bss, u8 ie)
240 {
241 u8 *end, *pos;
242
243 pos = bss->ies;
244 if (pos == NULL)
245 return NULL;
246 end = pos + bss->ies_len;
247
248 while (pos + 1 < end) {
249 if (pos + 2 + pos[1] > end)
250 break;
251 if (pos[0] == ie)
252 return pos;
253 pos += 2 + pos[1];
254 }
255
256 return NULL;
257 }
258
259
260 static int ecw2cw(int ecw)
261 {
262 return (1 << ecw) - 1;
263 }
264
265
266 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
267 struct ieee80211_sta_bss *bss,
268 int ibss)
269 {
270 struct ieee80211_local *local = sdata->local;
271 int i, have_higher_than_11mbit = 0;
272
273
274 /* cf. IEEE 802.11 9.2.12 */
275 for (i = 0; i < bss->supp_rates_len; i++)
276 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
277 have_higher_than_11mbit = 1;
278
279 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
280 have_higher_than_11mbit)
281 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
282 else
283 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
284
285
286 if (local->ops->conf_tx) {
287 struct ieee80211_tx_queue_params qparam;
288
289 memset(&qparam, 0, sizeof(qparam));
290
291 qparam.aifs = 2;
292
293 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
294 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
295 qparam.cw_min = 31;
296 else
297 qparam.cw_min = 15;
298
299 qparam.cw_max = 1023;
300 qparam.txop = 0;
301
302 for (i = 0; i < local_to_hw(local)->queues; i++)
303 local->ops->conf_tx(local_to_hw(local), i, &qparam);
304 }
305 }
306
307 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
308 struct ieee80211_if_sta *ifsta,
309 u8 *wmm_param, size_t wmm_param_len)
310 {
311 struct ieee80211_tx_queue_params params;
312 size_t left;
313 int count;
314 u8 *pos;
315
316 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
317 return;
318
319 if (!wmm_param)
320 return;
321
322 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
323 return;
324 count = wmm_param[6] & 0x0f;
325 if (count == ifsta->wmm_last_param_set)
326 return;
327 ifsta->wmm_last_param_set = count;
328
329 pos = wmm_param + 8;
330 left = wmm_param_len - 8;
331
332 memset(&params, 0, sizeof(params));
333
334 if (!local->ops->conf_tx)
335 return;
336
337 local->wmm_acm = 0;
338 for (; left >= 4; left -= 4, pos += 4) {
339 int aci = (pos[0] >> 5) & 0x03;
340 int acm = (pos[0] >> 4) & 0x01;
341 int queue;
342
343 switch (aci) {
344 case 1:
345 queue = 3;
346 if (acm)
347 local->wmm_acm |= BIT(0) | BIT(3);
348 break;
349 case 2:
350 queue = 1;
351 if (acm)
352 local->wmm_acm |= BIT(4) | BIT(5);
353 break;
354 case 3:
355 queue = 0;
356 if (acm)
357 local->wmm_acm |= BIT(6) | BIT(7);
358 break;
359 case 0:
360 default:
361 queue = 2;
362 if (acm)
363 local->wmm_acm |= BIT(1) | BIT(2);
364 break;
365 }
366
367 params.aifs = pos[0] & 0x0f;
368 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
369 params.cw_min = ecw2cw(pos[1] & 0x0f);
370 params.txop = get_unaligned_le16(pos + 2);
371 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
372 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
373 "cWmin=%d cWmax=%d txop=%d\n",
374 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
375 params.cw_max, params.txop);
376 #endif
377 /* TODO: handle ACM (block TX, fallback to next lowest allowed
378 * AC for now) */
379 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
380 printk(KERN_DEBUG "%s: failed to set TX queue "
381 "parameters for queue %d\n", local->mdev->name, queue);
382 }
383 }
384 }
385
386 static u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
387 bool use_protection,
388 bool use_short_preamble)
389 {
390 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
391 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
392 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
393 DECLARE_MAC_BUF(mac);
394 #endif
395 u32 changed = 0;
396
397 if (use_protection != bss_conf->use_cts_prot) {
398 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
399 if (net_ratelimit()) {
400 printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
401 "%s)\n",
402 sdata->dev->name,
403 use_protection ? "enabled" : "disabled",
404 print_mac(mac, ifsta->bssid));
405 }
406 #endif
407 bss_conf->use_cts_prot = use_protection;
408 changed |= BSS_CHANGED_ERP_CTS_PROT;
409 }
410
411 if (use_short_preamble != bss_conf->use_short_preamble) {
412 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
413 if (net_ratelimit()) {
414 printk(KERN_DEBUG "%s: switched to %s barker preamble"
415 " (BSSID=%s)\n",
416 sdata->dev->name,
417 use_short_preamble ? "short" : "long",
418 print_mac(mac, ifsta->bssid));
419 }
420 #endif
421 bss_conf->use_short_preamble = use_short_preamble;
422 changed |= BSS_CHANGED_ERP_PREAMBLE;
423 }
424
425 return changed;
426 }
427
428 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
429 u8 erp_value)
430 {
431 bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
432 bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
433
434 return ieee80211_handle_protect_preamb(sdata,
435 use_protection, use_short_preamble);
436 }
437
438 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
439 struct ieee80211_sta_bss *bss)
440 {
441 u32 changed = 0;
442
443 if (bss->has_erp_value)
444 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
445 else {
446 u16 capab = bss->capability;
447 changed |= ieee80211_handle_protect_preamb(sdata, false,
448 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
449 }
450
451 return changed;
452 }
453
454 int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
455 struct ieee80211_ht_info *ht_info)
456 {
457
458 if (ht_info == NULL)
459 return -EINVAL;
460
461 memset(ht_info, 0, sizeof(*ht_info));
462
463 if (ht_cap_ie) {
464 u8 ampdu_info = ht_cap_ie->ampdu_params_info;
465
466 ht_info->ht_supported = 1;
467 ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
468 ht_info->ampdu_factor =
469 ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
470 ht_info->ampdu_density =
471 (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
472 memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
473 } else
474 ht_info->ht_supported = 0;
475
476 return 0;
477 }
478
479 int ieee80211_ht_addt_info_ie_to_ht_bss_info(
480 struct ieee80211_ht_addt_info *ht_add_info_ie,
481 struct ieee80211_ht_bss_info *bss_info)
482 {
483 if (bss_info == NULL)
484 return -EINVAL;
485
486 memset(bss_info, 0, sizeof(*bss_info));
487
488 if (ht_add_info_ie) {
489 u16 op_mode;
490 op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);
491
492 bss_info->primary_channel = ht_add_info_ie->control_chan;
493 bss_info->bss_cap = ht_add_info_ie->ht_param;
494 bss_info->bss_op_mode = (u8)(op_mode & 0xff);
495 }
496
497 return 0;
498 }
499
500 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
501 struct ieee80211_if_sta *ifsta)
502 {
503 union iwreq_data wrqu;
504
505 if (ifsta->assocreq_ies) {
506 memset(&wrqu, 0, sizeof(wrqu));
507 wrqu.data.length = ifsta->assocreq_ies_len;
508 wireless_send_event(sdata->dev, IWEVASSOCREQIE, &wrqu,
509 ifsta->assocreq_ies);
510 }
511 if (ifsta->assocresp_ies) {
512 memset(&wrqu, 0, sizeof(wrqu));
513 wrqu.data.length = ifsta->assocresp_ies_len;
514 wireless_send_event(sdata->dev, IWEVASSOCRESPIE, &wrqu,
515 ifsta->assocresp_ies);
516 }
517 }
518
519
520 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
521 struct ieee80211_if_sta *ifsta,
522 bool assoc)
523 {
524 struct ieee80211_local *local = sdata->local;
525 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
526 union iwreq_data wrqu;
527 u32 changed = BSS_CHANGED_ASSOC;
528
529 if (assoc) {
530 struct ieee80211_sta_bss *bss;
531
532 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
533
534 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
535 return;
536
537 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
538 conf->channel->center_freq,
539 ifsta->ssid, ifsta->ssid_len);
540 if (bss) {
541 /* set timing information */
542 sdata->bss_conf.beacon_int = bss->beacon_int;
543 sdata->bss_conf.timestamp = bss->timestamp;
544 sdata->bss_conf.dtim_period = bss->dtim_period;
545
546 changed |= ieee80211_handle_bss_capability(sdata, bss);
547
548 ieee80211_rx_bss_put(local, bss);
549 }
550
551 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
552 changed |= BSS_CHANGED_HT;
553 sdata->bss_conf.assoc_ht = 1;
554 sdata->bss_conf.ht_conf = &conf->ht_conf;
555 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
556 }
557
558 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
559 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
560 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
561 ieee80211_sta_send_associnfo(sdata, ifsta);
562 } else {
563 netif_carrier_off(sdata->dev);
564 ieee80211_sta_tear_down_BA_sessions(sdata, ifsta->bssid);
565 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
566 changed |= ieee80211_reset_erp_info(sdata);
567
568 sdata->bss_conf.assoc_ht = 0;
569 sdata->bss_conf.ht_conf = NULL;
570 sdata->bss_conf.ht_bss_conf = NULL;
571
572 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
573 }
574 ifsta->last_probe = jiffies;
575 ieee80211_led_assoc(local, assoc);
576
577 sdata->bss_conf.assoc = assoc;
578 ieee80211_bss_info_change_notify(sdata, changed);
579
580 if (assoc)
581 netif_carrier_on(sdata->dev);
582
583 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
584 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
585 }
586
587 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
588 struct ieee80211_if_sta *ifsta, int deauth)
589 {
590 if (deauth) {
591 ifsta->direct_probe_tries = 0;
592 ifsta->auth_tries = 0;
593 }
594 ifsta->assoc_scan_tries = 0;
595 ifsta->assoc_tries = 0;
596 ieee80211_set_associated(sdata, ifsta, 0);
597 }
598
599 void ieee80211_sta_tx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
600 int encrypt)
601 {
602 skb->dev = sdata->local->mdev;
603 skb_set_mac_header(skb, 0);
604 skb_set_network_header(skb, 0);
605 skb_set_transport_header(skb, 0);
606
607 skb->iif = sdata->dev->ifindex;
608 skb->do_not_encrypt = !encrypt;
609
610 dev_queue_xmit(skb);
611 }
612
613
614 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
615 struct ieee80211_if_sta *ifsta,
616 int transaction, u8 *extra, size_t extra_len,
617 int encrypt)
618 {
619 struct ieee80211_local *local = sdata->local;
620 struct sk_buff *skb;
621 struct ieee80211_mgmt *mgmt;
622
623 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
624 sizeof(*mgmt) + 6 + extra_len);
625 if (!skb) {
626 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
627 "frame\n", sdata->dev->name);
628 return;
629 }
630 skb_reserve(skb, local->hw.extra_tx_headroom);
631
632 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
633 memset(mgmt, 0, 24 + 6);
634 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
635 IEEE80211_STYPE_AUTH);
636 if (encrypt)
637 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
638 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
639 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
640 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
641 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
642 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
643 ifsta->auth_transaction = transaction + 1;
644 mgmt->u.auth.status_code = cpu_to_le16(0);
645 if (extra)
646 memcpy(skb_put(skb, extra_len), extra, extra_len);
647
648 ieee80211_sta_tx(sdata, skb, encrypt);
649 }
650
651 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
652 struct ieee80211_if_sta *ifsta)
653 {
654 DECLARE_MAC_BUF(mac);
655
656 ifsta->direct_probe_tries++;
657 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
658 printk(KERN_DEBUG "%s: direct probe to AP %s timed out\n",
659 sdata->dev->name, print_mac(mac, ifsta->bssid));
660 ifsta->state = IEEE80211_STA_MLME_DISABLED;
661 return;
662 }
663
664 printk(KERN_DEBUG "%s: direct probe to AP %s try %d\n",
665 sdata->dev->name, print_mac(mac, ifsta->bssid),
666 ifsta->direct_probe_tries);
667
668 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
669
670 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
671
672 /* Direct probe is sent to broadcast address as some APs
673 * will not answer to direct packet in unassociated state.
674 */
675 ieee80211_send_probe_req(sdata, NULL,
676 ifsta->ssid, ifsta->ssid_len);
677
678 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
679 }
680
681
682 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
683 struct ieee80211_if_sta *ifsta)
684 {
685 DECLARE_MAC_BUF(mac);
686
687 ifsta->auth_tries++;
688 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
689 printk(KERN_DEBUG "%s: authentication with AP %s"
690 " timed out\n",
691 sdata->dev->name, print_mac(mac, ifsta->bssid));
692 ifsta->state = IEEE80211_STA_MLME_DISABLED;
693 return;
694 }
695
696 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
697 printk(KERN_DEBUG "%s: authenticate with AP %s\n",
698 sdata->dev->name, print_mac(mac, ifsta->bssid));
699
700 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
701
702 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
703 }
704
705 static int ieee80211_compatible_rates(struct ieee80211_sta_bss *bss,
706 struct ieee80211_supported_band *sband,
707 u64 *rates)
708 {
709 int i, j, count;
710 *rates = 0;
711 count = 0;
712 for (i = 0; i < bss->supp_rates_len; i++) {
713 int rate = (bss->supp_rates[i] & 0x7F) * 5;
714
715 for (j = 0; j < sband->n_bitrates; j++)
716 if (sband->bitrates[j].bitrate == rate) {
717 *rates |= BIT(j);
718 count++;
719 break;
720 }
721 }
722
723 return count;
724 }
725
726 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
727 struct ieee80211_if_sta *ifsta)
728 {
729 struct ieee80211_local *local = sdata->local;
730 struct sk_buff *skb;
731 struct ieee80211_mgmt *mgmt;
732 u8 *pos, *ies, *ht_add_ie;
733 int i, len, count, rates_len, supp_rates_len;
734 u16 capab;
735 struct ieee80211_sta_bss *bss;
736 int wmm = 0;
737 struct ieee80211_supported_band *sband;
738 u64 rates = 0;
739
740 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
741 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
742 ifsta->ssid_len);
743 if (!skb) {
744 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
745 "frame\n", sdata->dev->name);
746 return;
747 }
748 skb_reserve(skb, local->hw.extra_tx_headroom);
749
750 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
751
752 capab = ifsta->capab;
753
754 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
755 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
756 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
757 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
758 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
759 }
760
761 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
762 local->hw.conf.channel->center_freq,
763 ifsta->ssid, ifsta->ssid_len);
764 if (bss) {
765 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
766 capab |= WLAN_CAPABILITY_PRIVACY;
767 if (bss->wmm_used)
768 wmm = 1;
769
770 /* get all rates supported by the device and the AP as
771 * some APs don't like getting a superset of their rates
772 * in the association request (e.g. D-Link DAP 1353 in
773 * b-only mode) */
774 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
775
776 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
777 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
778 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
779
780 ieee80211_rx_bss_put(local, bss);
781 } else {
782 rates = ~0;
783 rates_len = sband->n_bitrates;
784 }
785
786 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
787 memset(mgmt, 0, 24);
788 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
789 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
790 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
791
792 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
793 skb_put(skb, 10);
794 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
795 IEEE80211_STYPE_REASSOC_REQ);
796 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
797 mgmt->u.reassoc_req.listen_interval =
798 cpu_to_le16(local->hw.conf.listen_interval);
799 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
800 ETH_ALEN);
801 } else {
802 skb_put(skb, 4);
803 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
804 IEEE80211_STYPE_ASSOC_REQ);
805 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
806 mgmt->u.reassoc_req.listen_interval =
807 cpu_to_le16(local->hw.conf.listen_interval);
808 }
809
810 /* SSID */
811 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
812 *pos++ = WLAN_EID_SSID;
813 *pos++ = ifsta->ssid_len;
814 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
815
816 /* add all rates which were marked to be used above */
817 supp_rates_len = rates_len;
818 if (supp_rates_len > 8)
819 supp_rates_len = 8;
820
821 len = sband->n_bitrates;
822 pos = skb_put(skb, supp_rates_len + 2);
823 *pos++ = WLAN_EID_SUPP_RATES;
824 *pos++ = supp_rates_len;
825
826 count = 0;
827 for (i = 0; i < sband->n_bitrates; i++) {
828 if (BIT(i) & rates) {
829 int rate = sband->bitrates[i].bitrate;
830 *pos++ = (u8) (rate / 5);
831 if (++count == 8)
832 break;
833 }
834 }
835
836 if (rates_len > count) {
837 pos = skb_put(skb, rates_len - count + 2);
838 *pos++ = WLAN_EID_EXT_SUPP_RATES;
839 *pos++ = rates_len - count;
840
841 for (i++; i < sband->n_bitrates; i++) {
842 if (BIT(i) & rates) {
843 int rate = sband->bitrates[i].bitrate;
844 *pos++ = (u8) (rate / 5);
845 }
846 }
847 }
848
849 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
850 /* 1. power capabilities */
851 pos = skb_put(skb, 4);
852 *pos++ = WLAN_EID_PWR_CAPABILITY;
853 *pos++ = 2;
854 *pos++ = 0; /* min tx power */
855 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
856
857 /* 2. supported channels */
858 /* TODO: get this in reg domain format */
859 pos = skb_put(skb, 2 * sband->n_channels + 2);
860 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
861 *pos++ = 2 * sband->n_channels;
862 for (i = 0; i < sband->n_channels; i++) {
863 *pos++ = ieee80211_frequency_to_channel(
864 sband->channels[i].center_freq);
865 *pos++ = 1; /* one channel in the subband*/
866 }
867 }
868
869 if (ifsta->extra_ie) {
870 pos = skb_put(skb, ifsta->extra_ie_len);
871 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
872 }
873
874 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
875 pos = skb_put(skb, 9);
876 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
877 *pos++ = 7; /* len */
878 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
879 *pos++ = 0x50;
880 *pos++ = 0xf2;
881 *pos++ = 2; /* WME */
882 *pos++ = 0; /* WME info */
883 *pos++ = 1; /* WME ver */
884 *pos++ = 0;
885 }
886
887 /* wmm support is a must to HT */
888 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
889 sband->ht_info.ht_supported &&
890 (ht_add_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_EXTRA_INFO))) {
891 struct ieee80211_ht_addt_info *ht_add_info =
892 (struct ieee80211_ht_addt_info *)ht_add_ie;
893 u16 cap = sband->ht_info.cap;
894 __le16 tmp;
895 u32 flags = local->hw.conf.channel->flags;
896
897 switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
898 case IEEE80211_HT_IE_CHA_SEC_ABOVE:
899 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
900 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
901 cap &= ~IEEE80211_HT_CAP_SGI_40;
902 }
903 break;
904 case IEEE80211_HT_IE_CHA_SEC_BELOW:
905 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
906 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
907 cap &= ~IEEE80211_HT_CAP_SGI_40;
908 }
909 break;
910 }
911
912 tmp = cpu_to_le16(cap);
913 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
914 *pos++ = WLAN_EID_HT_CAPABILITY;
915 *pos++ = sizeof(struct ieee80211_ht_cap);
916 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
917 memcpy(pos, &tmp, sizeof(u16));
918 pos += sizeof(u16);
919 /* TODO: needs a define here for << 2 */
920 *pos++ = sband->ht_info.ampdu_factor |
921 (sband->ht_info.ampdu_density << 2);
922 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
923 }
924
925 kfree(ifsta->assocreq_ies);
926 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
927 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
928 if (ifsta->assocreq_ies)
929 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
930
931 ieee80211_sta_tx(sdata, skb, 0);
932 }
933
934
935 static void ieee80211_send_deauth(struct ieee80211_sub_if_data *sdata,
936 struct ieee80211_if_sta *ifsta, u16 reason)
937 {
938 struct ieee80211_local *local = sdata->local;
939 struct sk_buff *skb;
940 struct ieee80211_mgmt *mgmt;
941
942 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
943 if (!skb) {
944 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
945 "frame\n", sdata->dev->name);
946 return;
947 }
948 skb_reserve(skb, local->hw.extra_tx_headroom);
949
950 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
951 memset(mgmt, 0, 24);
952 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
953 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
954 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
955 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
956 IEEE80211_STYPE_DEAUTH);
957 skb_put(skb, 2);
958 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
959
960 ieee80211_sta_tx(sdata, skb, 0);
961 }
962
963
964 static void ieee80211_send_disassoc(struct ieee80211_sub_if_data *sdata,
965 struct ieee80211_if_sta *ifsta, u16 reason)
966 {
967 struct ieee80211_local *local = sdata->local;
968 struct sk_buff *skb;
969 struct ieee80211_mgmt *mgmt;
970
971 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
972 if (!skb) {
973 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
974 "frame\n", sdata->dev->name);
975 return;
976 }
977 skb_reserve(skb, local->hw.extra_tx_headroom);
978
979 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
980 memset(mgmt, 0, 24);
981 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
982 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
983 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
984 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
985 IEEE80211_STYPE_DISASSOC);
986 skb_put(skb, 2);
987 mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
988
989 ieee80211_sta_tx(sdata, skb, 0);
990 }
991
992
993 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
994 struct ieee80211_if_sta *ifsta)
995 {
996 struct ieee80211_local *local = sdata->local;
997 struct ieee80211_sta_bss *bss;
998 int bss_privacy;
999 int wep_privacy;
1000 int privacy_invoked;
1001
1002 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
1003 return 0;
1004
1005 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1006 local->hw.conf.channel->center_freq,
1007 ifsta->ssid, ifsta->ssid_len);
1008 if (!bss)
1009 return 0;
1010
1011 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
1012 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1013 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
1014
1015 ieee80211_rx_bss_put(local, bss);
1016
1017 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1018 return 0;
1019
1020 return 1;
1021 }
1022
1023
1024 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1025 struct ieee80211_if_sta *ifsta)
1026 {
1027 DECLARE_MAC_BUF(mac);
1028
1029 ifsta->assoc_tries++;
1030 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1031 printk(KERN_DEBUG "%s: association with AP %s"
1032 " timed out\n",
1033 sdata->dev->name, print_mac(mac, ifsta->bssid));
1034 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1035 return;
1036 }
1037
1038 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1039 printk(KERN_DEBUG "%s: associate with AP %s\n",
1040 sdata->dev->name, print_mac(mac, ifsta->bssid));
1041 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1042 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1043 "mixed-cell disabled - abort association\n", sdata->dev->name);
1044 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1045 return;
1046 }
1047
1048 ieee80211_send_assoc(sdata, ifsta);
1049
1050 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1051 }
1052
1053
1054 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1055 struct ieee80211_if_sta *ifsta)
1056 {
1057 struct ieee80211_local *local = sdata->local;
1058 struct sta_info *sta;
1059 int disassoc;
1060 DECLARE_MAC_BUF(mac);
1061
1062 /* TODO: start monitoring current AP signal quality and number of
1063 * missed beacons. Scan other channels every now and then and search
1064 * for better APs. */
1065 /* TODO: remove expired BSSes */
1066
1067 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1068
1069 rcu_read_lock();
1070
1071 sta = sta_info_get(local, ifsta->bssid);
1072 if (!sta) {
1073 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
1074 sdata->dev->name, print_mac(mac, ifsta->bssid));
1075 disassoc = 1;
1076 } else {
1077 disassoc = 0;
1078 if (time_after(jiffies,
1079 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1080 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1081 printk(KERN_DEBUG "%s: No ProbeResp from "
1082 "current AP %s - assume out of "
1083 "range\n",
1084 sdata->dev->name, print_mac(mac, ifsta->bssid));
1085 disassoc = 1;
1086 sta_info_unlink(&sta);
1087 } else
1088 ieee80211_send_probe_req(sdata, ifsta->bssid,
1089 local->scan_ssid,
1090 local->scan_ssid_len);
1091 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1092 } else {
1093 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1094 if (time_after(jiffies, ifsta->last_probe +
1095 IEEE80211_PROBE_INTERVAL)) {
1096 ifsta->last_probe = jiffies;
1097 ieee80211_send_probe_req(sdata, ifsta->bssid,
1098 ifsta->ssid,
1099 ifsta->ssid_len);
1100 }
1101 }
1102 }
1103
1104 rcu_read_unlock();
1105
1106 if (disassoc && sta)
1107 sta_info_destroy(sta);
1108
1109 if (disassoc) {
1110 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1111 ieee80211_set_associated(sdata, ifsta, 0);
1112 } else {
1113 mod_timer(&ifsta->timer, jiffies +
1114 IEEE80211_MONITORING_INTERVAL);
1115 }
1116 }
1117
1118
1119 static void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1120 u8 *ssid, size_t ssid_len)
1121 {
1122 struct ieee80211_local *local = sdata->local;
1123 struct ieee80211_supported_band *sband;
1124 struct sk_buff *skb;
1125 struct ieee80211_mgmt *mgmt;
1126 u8 *pos, *supp_rates, *esupp_rates = NULL;
1127 int i;
1128
1129 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
1130 if (!skb) {
1131 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1132 "request\n", sdata->dev->name);
1133 return;
1134 }
1135 skb_reserve(skb, local->hw.extra_tx_headroom);
1136
1137 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1138 memset(mgmt, 0, 24);
1139 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1140 IEEE80211_STYPE_PROBE_REQ);
1141 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1142 if (dst) {
1143 memcpy(mgmt->da, dst, ETH_ALEN);
1144 memcpy(mgmt->bssid, dst, ETH_ALEN);
1145 } else {
1146 memset(mgmt->da, 0xff, ETH_ALEN);
1147 memset(mgmt->bssid, 0xff, ETH_ALEN);
1148 }
1149 pos = skb_put(skb, 2 + ssid_len);
1150 *pos++ = WLAN_EID_SSID;
1151 *pos++ = ssid_len;
1152 memcpy(pos, ssid, ssid_len);
1153
1154 supp_rates = skb_put(skb, 2);
1155 supp_rates[0] = WLAN_EID_SUPP_RATES;
1156 supp_rates[1] = 0;
1157 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1158
1159 for (i = 0; i < sband->n_bitrates; i++) {
1160 struct ieee80211_rate *rate = &sband->bitrates[i];
1161 if (esupp_rates) {
1162 pos = skb_put(skb, 1);
1163 esupp_rates[1]++;
1164 } else if (supp_rates[1] == 8) {
1165 esupp_rates = skb_put(skb, 3);
1166 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
1167 esupp_rates[1] = 1;
1168 pos = &esupp_rates[2];
1169 } else {
1170 pos = skb_put(skb, 1);
1171 supp_rates[1]++;
1172 }
1173 *pos = rate->bitrate / 5;
1174 }
1175
1176 ieee80211_sta_tx(sdata, skb, 0);
1177 }
1178
1179
1180 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1181 {
1182 if (!sdata || !sdata->default_key ||
1183 sdata->default_key->conf.alg != ALG_WEP)
1184 return 0;
1185 return 1;
1186 }
1187
1188
1189 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1190 struct ieee80211_if_sta *ifsta)
1191 {
1192 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1193 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1194 ieee80211_associate(sdata, ifsta);
1195 }
1196
1197
1198 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1199 struct ieee80211_if_sta *ifsta,
1200 struct ieee80211_mgmt *mgmt,
1201 size_t len)
1202 {
1203 u8 *pos;
1204 struct ieee802_11_elems elems;
1205
1206 pos = mgmt->u.auth.variable;
1207 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1208 if (!elems.challenge)
1209 return;
1210 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1211 elems.challenge_len + 2, 1);
1212 }
1213
1214 static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
1215 u8 dialog_token, u16 status, u16 policy,
1216 u16 buf_size, u16 timeout)
1217 {
1218 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1219 struct ieee80211_local *local = sdata->local;
1220 struct sk_buff *skb;
1221 struct ieee80211_mgmt *mgmt;
1222 u16 capab;
1223
1224 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1225
1226 if (!skb) {
1227 printk(KERN_DEBUG "%s: failed to allocate buffer "
1228 "for addba resp frame\n", sdata->dev->name);
1229 return;
1230 }
1231
1232 skb_reserve(skb, local->hw.extra_tx_headroom);
1233 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1234 memset(mgmt, 0, 24);
1235 memcpy(mgmt->da, da, ETH_ALEN);
1236 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1237 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1238 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1239 else
1240 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1241 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1242 IEEE80211_STYPE_ACTION);
1243
1244 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
1245 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1246 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
1247 mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
1248
1249 capab = (u16)(policy << 1); /* bit 1 aggregation policy */
1250 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1251 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
1252
1253 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
1254 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
1255 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
1256
1257 ieee80211_sta_tx(sdata, skb, 0);
1258
1259 return;
1260 }
1261
1262 void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, const u8 *da,
1263 u16 tid, u8 dialog_token, u16 start_seq_num,
1264 u16 agg_size, u16 timeout)
1265 {
1266 struct ieee80211_local *local = sdata->local;
1267 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1268 struct sk_buff *skb;
1269 struct ieee80211_mgmt *mgmt;
1270 u16 capab;
1271
1272 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1273
1274 if (!skb) {
1275 printk(KERN_ERR "%s: failed to allocate buffer "
1276 "for addba request frame\n", sdata->dev->name);
1277 return;
1278 }
1279 skb_reserve(skb, local->hw.extra_tx_headroom);
1280 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1281 memset(mgmt, 0, 24);
1282 memcpy(mgmt->da, da, ETH_ALEN);
1283 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1284 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1285 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1286 else
1287 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1288
1289 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1290 IEEE80211_STYPE_ACTION);
1291
1292 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
1293
1294 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1295 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
1296
1297 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
1298 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
1299 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1300 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
1301
1302 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
1303
1304 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
1305 mgmt->u.action.u.addba_req.start_seq_num =
1306 cpu_to_le16(start_seq_num << 4);
1307
1308 ieee80211_sta_tx(sdata, skb, 0);
1309 }
1310
1311 static void ieee80211_sta_process_addba_request(struct ieee80211_local *local,
1312 struct ieee80211_mgmt *mgmt,
1313 size_t len)
1314 {
1315 struct ieee80211_hw *hw = &local->hw;
1316 struct ieee80211_conf *conf = &hw->conf;
1317 struct sta_info *sta;
1318 struct tid_ampdu_rx *tid_agg_rx;
1319 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
1320 u8 dialog_token;
1321 int ret = -EOPNOTSUPP;
1322 DECLARE_MAC_BUF(mac);
1323
1324 rcu_read_lock();
1325
1326 sta = sta_info_get(local, mgmt->sa);
1327 if (!sta) {
1328 rcu_read_unlock();
1329 return;
1330 }
1331
1332 /* extract session parameters from addba request frame */
1333 dialog_token = mgmt->u.action.u.addba_req.dialog_token;
1334 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
1335 start_seq_num =
1336 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
1337
1338 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
1339 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
1340 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1341 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
1342
1343 status = WLAN_STATUS_REQUEST_DECLINED;
1344
1345 /* sanity check for incoming parameters:
1346 * check if configuration can support the BA policy
1347 * and if buffer size does not exceeds max value */
1348 if (((ba_policy != 1)
1349 && (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA)))
1350 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
1351 status = WLAN_STATUS_INVALID_QOS_PARAM;
1352 #ifdef CONFIG_MAC80211_HT_DEBUG
1353 if (net_ratelimit())
1354 printk(KERN_DEBUG "AddBA Req with bad params from "
1355 "%s on tid %u. policy %d, buffer size %d\n",
1356 print_mac(mac, mgmt->sa), tid, ba_policy,
1357 buf_size);
1358 #endif /* CONFIG_MAC80211_HT_DEBUG */
1359 goto end_no_lock;
1360 }
1361 /* determine default buffer size */
1362 if (buf_size == 0) {
1363 struct ieee80211_supported_band *sband;
1364
1365 sband = local->hw.wiphy->bands[conf->channel->band];
1366 buf_size = IEEE80211_MIN_AMPDU_BUF;
1367 buf_size = buf_size << sband->ht_info.ampdu_factor;
1368 }
1369
1370
1371 /* examine state machine */
1372 spin_lock_bh(&sta->lock);
1373
1374 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
1375 #ifdef CONFIG_MAC80211_HT_DEBUG
1376 if (net_ratelimit())
1377 printk(KERN_DEBUG "unexpected AddBA Req from "
1378 "%s on tid %u\n",
1379 print_mac(mac, mgmt->sa), tid);
1380 #endif /* CONFIG_MAC80211_HT_DEBUG */
1381 goto end;
1382 }
1383
1384 /* prepare A-MPDU MLME for Rx aggregation */
1385 sta->ampdu_mlme.tid_rx[tid] =
1386 kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
1387 if (!sta->ampdu_mlme.tid_rx[tid]) {
1388 #ifdef CONFIG_MAC80211_HT_DEBUG
1389 if (net_ratelimit())
1390 printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
1391 tid);
1392 #endif
1393 goto end;
1394 }
1395 /* rx timer */
1396 sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
1397 sta_rx_agg_session_timer_expired;
1398 sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
1399 (unsigned long)&sta->timer_to_tid[tid];
1400 init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1401
1402 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
1403
1404 /* prepare reordering buffer */
1405 tid_agg_rx->reorder_buf =
1406 kmalloc(buf_size * sizeof(struct sk_buff *), GFP_ATOMIC);
1407 if (!tid_agg_rx->reorder_buf) {
1408 #ifdef CONFIG_MAC80211_HT_DEBUG
1409 if (net_ratelimit())
1410 printk(KERN_ERR "can not allocate reordering buffer "
1411 "to tid %d\n", tid);
1412 #endif
1413 kfree(sta->ampdu_mlme.tid_rx[tid]);
1414 goto end;
1415 }
1416 memset(tid_agg_rx->reorder_buf, 0,
1417 buf_size * sizeof(struct sk_buff *));
1418
1419 if (local->ops->ampdu_action)
1420 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
1421 sta->addr, tid, &start_seq_num);
1422 #ifdef CONFIG_MAC80211_HT_DEBUG
1423 printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
1424 #endif /* CONFIG_MAC80211_HT_DEBUG */
1425
1426 if (ret) {
1427 kfree(tid_agg_rx->reorder_buf);
1428 kfree(tid_agg_rx);
1429 sta->ampdu_mlme.tid_rx[tid] = NULL;
1430 goto end;
1431 }
1432
1433 /* change state and send addba resp */
1434 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
1435 tid_agg_rx->dialog_token = dialog_token;
1436 tid_agg_rx->ssn = start_seq_num;
1437 tid_agg_rx->head_seq_num = start_seq_num;
1438 tid_agg_rx->buf_size = buf_size;
1439 tid_agg_rx->timeout = timeout;
1440 tid_agg_rx->stored_mpdu_num = 0;
1441 status = WLAN_STATUS_SUCCESS;
1442 end:
1443 spin_unlock_bh(&sta->lock);
1444
1445 end_no_lock:
1446 ieee80211_send_addba_resp(sta->sdata, sta->addr, tid,
1447 dialog_token, status, 1, buf_size, timeout);
1448 rcu_read_unlock();
1449 }
1450
1451 static void ieee80211_sta_process_addba_resp(struct ieee80211_local *local,
1452 struct ieee80211_mgmt *mgmt,
1453 size_t len)
1454 {
1455 struct ieee80211_hw *hw = &local->hw;
1456 struct sta_info *sta;
1457 u16 capab;
1458 u16 tid;
1459 u8 *state;
1460
1461 rcu_read_lock();
1462
1463 sta = sta_info_get(local, mgmt->sa);
1464 if (!sta) {
1465 rcu_read_unlock();
1466 return;
1467 }
1468
1469 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
1470 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1471
1472 state = &sta->ampdu_mlme.tid_state_tx[tid];
1473
1474 spin_lock_bh(&sta->lock);
1475
1476 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1477 spin_unlock_bh(&sta->lock);
1478 goto addba_resp_exit;
1479 }
1480
1481 if (mgmt->u.action.u.addba_resp.dialog_token !=
1482 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
1483 spin_unlock_bh(&sta->lock);
1484 #ifdef CONFIG_MAC80211_HT_DEBUG
1485 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
1486 #endif /* CONFIG_MAC80211_HT_DEBUG */
1487 goto addba_resp_exit;
1488 }
1489
1490 del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
1491 #ifdef CONFIG_MAC80211_HT_DEBUG
1492 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
1493 #endif /* CONFIG_MAC80211_HT_DEBUG */
1494 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
1495 == WLAN_STATUS_SUCCESS) {
1496 *state |= HT_ADDBA_RECEIVED_MSK;
1497 sta->ampdu_mlme.addba_req_num[tid] = 0;
1498
1499 if (*state == HT_AGG_STATE_OPERATIONAL)
1500 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
1501
1502 spin_unlock_bh(&sta->lock);
1503 } else {
1504 sta->ampdu_mlme.addba_req_num[tid]++;
1505 /* this will allow the state check in stop_BA_session */
1506 *state = HT_AGG_STATE_OPERATIONAL;
1507 spin_unlock_bh(&sta->lock);
1508 ieee80211_stop_tx_ba_session(hw, sta->addr, tid,
1509 WLAN_BACK_INITIATOR);
1510 }
1511
1512 addba_resp_exit:
1513 rcu_read_unlock();
1514 }
1515
1516 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, const u8 *da, u16 tid,
1517 u16 initiator, u16 reason_code)
1518 {
1519 struct ieee80211_local *local = sdata->local;
1520 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1521 struct sk_buff *skb;
1522 struct ieee80211_mgmt *mgmt;
1523 u16 params;
1524
1525 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1526
1527 if (!skb) {
1528 printk(KERN_ERR "%s: failed to allocate buffer "
1529 "for delba frame\n", sdata->dev->name);
1530 return;
1531 }
1532
1533 skb_reserve(skb, local->hw.extra_tx_headroom);
1534 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1535 memset(mgmt, 0, 24);
1536 memcpy(mgmt->da, da, ETH_ALEN);
1537 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1538 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1539 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1540 else
1541 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1542 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1543 IEEE80211_STYPE_ACTION);
1544
1545 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
1546
1547 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1548 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
1549 params = (u16)(initiator << 11); /* bit 11 initiator */
1550 params |= (u16)(tid << 12); /* bit 15:12 TID number */
1551
1552 mgmt->u.action.u.delba.params = cpu_to_le16(params);
1553 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
1554
1555 ieee80211_sta_tx(sdata, skb, 0);
1556 }
1557
1558 void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
1559 {
1560 struct ieee80211_local *local = sdata->local;
1561 struct sk_buff *skb;
1562 struct ieee80211_bar *bar;
1563 u16 bar_control = 0;
1564
1565 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
1566 if (!skb) {
1567 printk(KERN_ERR "%s: failed to allocate buffer for "
1568 "bar frame\n", sdata->dev->name);
1569 return;
1570 }
1571 skb_reserve(skb, local->hw.extra_tx_headroom);
1572 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
1573 memset(bar, 0, sizeof(*bar));
1574 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
1575 IEEE80211_STYPE_BACK_REQ);
1576 memcpy(bar->ra, ra, ETH_ALEN);
1577 memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN);
1578 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
1579 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
1580 bar_control |= (u16)(tid << 12);
1581 bar->control = cpu_to_le16(bar_control);
1582 bar->start_seq_num = cpu_to_le16(ssn);
1583
1584 ieee80211_sta_tx(sdata, skb, 0);
1585 }
1586
1587 void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
1588 u16 initiator, u16 reason)
1589 {
1590 struct ieee80211_local *local = sdata->local;
1591 struct ieee80211_hw *hw = &local->hw;
1592 struct sta_info *sta;
1593 int ret, i;
1594 DECLARE_MAC_BUF(mac);
1595
1596 rcu_read_lock();
1597
1598 sta = sta_info_get(local, ra);
1599 if (!sta) {
1600 rcu_read_unlock();
1601 return;
1602 }
1603
1604 /* check if TID is in operational state */
1605 spin_lock_bh(&sta->lock);
1606 if (sta->ampdu_mlme.tid_state_rx[tid]
1607 != HT_AGG_STATE_OPERATIONAL) {
1608 spin_unlock_bh(&sta->lock);
1609 rcu_read_unlock();
1610 return;
1611 }
1612 sta->ampdu_mlme.tid_state_rx[tid] =
1613 HT_AGG_STATE_REQ_STOP_BA_MSK |
1614 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
1615 spin_unlock_bh(&sta->lock);
1616
1617 /* stop HW Rx aggregation. ampdu_action existence
1618 * already verified in session init so we add the BUG_ON */
1619 BUG_ON(!local->ops->ampdu_action);
1620
1621 #ifdef CONFIG_MAC80211_HT_DEBUG
1622 printk(KERN_DEBUG "Rx BA session stop requested for %s tid %u\n",
1623 print_mac(mac, ra), tid);
1624 #endif /* CONFIG_MAC80211_HT_DEBUG */
1625
1626 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
1627 ra, tid, NULL);
1628 if (ret)
1629 printk(KERN_DEBUG "HW problem - can not stop rx "
1630 "aggregation for tid %d\n", tid);
1631
1632 /* shutdown timer has not expired */
1633 if (initiator != WLAN_BACK_TIMER)
1634 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1635
1636 /* check if this is a self generated aggregation halt */
1637 if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
1638 ieee80211_send_delba(sdata, ra, tid, 0, reason);
1639
1640 /* free the reordering buffer */
1641 for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
1642 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
1643 /* release the reordered frames */
1644 dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
1645 sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
1646 sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
1647 }
1648 }
1649 /* free resources */
1650 kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
1651 kfree(sta->ampdu_mlme.tid_rx[tid]);
1652 sta->ampdu_mlme.tid_rx[tid] = NULL;
1653 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
1654
1655 rcu_read_unlock();
1656 }
1657
1658
1659 static void ieee80211_sta_process_delba(struct ieee80211_sub_if_data *sdata,
1660 struct ieee80211_mgmt *mgmt, size_t len)
1661 {
1662 struct ieee80211_local *local = sdata->local;
1663 struct sta_info *sta;
1664 u16 tid, params;
1665 u16 initiator;
1666 DECLARE_MAC_BUF(mac);
1667
1668 rcu_read_lock();
1669
1670 sta = sta_info_get(local, mgmt->sa);
1671 if (!sta) {
1672 rcu_read_unlock();
1673 return;
1674 }
1675
1676 params = le16_to_cpu(mgmt->u.action.u.delba.params);
1677 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
1678 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
1679
1680 #ifdef CONFIG_MAC80211_HT_DEBUG
1681 if (net_ratelimit())
1682 printk(KERN_DEBUG "delba from %s (%s) tid %d reason code %d\n",
1683 print_mac(mac, mgmt->sa),
1684 initiator ? "initiator" : "recipient", tid,
1685 mgmt->u.action.u.delba.reason_code);
1686 #endif /* CONFIG_MAC80211_HT_DEBUG */
1687
1688 if (initiator == WLAN_BACK_INITIATOR)
1689 ieee80211_sta_stop_rx_ba_session(sdata, sta->addr, tid,
1690 WLAN_BACK_INITIATOR, 0);
1691 else { /* WLAN_BACK_RECIPIENT */
1692 spin_lock_bh(&sta->lock);
1693 sta->ampdu_mlme.tid_state_tx[tid] =
1694 HT_AGG_STATE_OPERATIONAL;
1695 spin_unlock_bh(&sta->lock);
1696 ieee80211_stop_tx_ba_session(&local->hw, sta->addr, tid,
1697 WLAN_BACK_RECIPIENT);
1698 }
1699 rcu_read_unlock();
1700 }
1701
1702 /*
1703 * After sending add Block Ack request we activated a timer until
1704 * add Block Ack response will arrive from the recipient.
1705 * If this timer expires sta_addba_resp_timer_expired will be executed.
1706 */
1707 void sta_addba_resp_timer_expired(unsigned long data)
1708 {
1709 /* not an elegant detour, but there is no choice as the timer passes
1710 * only one argument, and both sta_info and TID are needed, so init
1711 * flow in sta_info_create gives the TID as data, while the timer_to_id
1712 * array gives the sta through container_of */
1713 u16 tid = *(u8 *)data;
1714 struct sta_info *temp_sta = container_of((void *)data,
1715 struct sta_info, timer_to_tid[tid]);
1716
1717 struct ieee80211_local *local = temp_sta->local;
1718 struct ieee80211_hw *hw = &local->hw;
1719 struct sta_info *sta;
1720 u8 *state;
1721
1722 rcu_read_lock();
1723
1724 sta = sta_info_get(local, temp_sta->addr);
1725 if (!sta) {
1726 rcu_read_unlock();
1727 return;
1728 }
1729
1730 state = &sta->ampdu_mlme.tid_state_tx[tid];
1731 /* check if the TID waits for addBA response */
1732 spin_lock_bh(&sta->lock);
1733 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1734 spin_unlock_bh(&sta->lock);
1735 *state = HT_AGG_STATE_IDLE;
1736 #ifdef CONFIG_MAC80211_HT_DEBUG
1737 printk(KERN_DEBUG "timer expired on tid %d but we are not "
1738 "expecting addBA response there", tid);
1739 #endif
1740 goto timer_expired_exit;
1741 }
1742
1743 #ifdef CONFIG_MAC80211_HT_DEBUG
1744 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
1745 #endif
1746
1747 /* go through the state check in stop_BA_session */
1748 *state = HT_AGG_STATE_OPERATIONAL;
1749 spin_unlock_bh(&sta->lock);
1750 ieee80211_stop_tx_ba_session(hw, temp_sta->addr, tid,
1751 WLAN_BACK_INITIATOR);
1752
1753 timer_expired_exit:
1754 rcu_read_unlock();
1755 }
1756
1757 /*
1758 * After accepting the AddBA Request we activated a timer,
1759 * resetting it after each frame that arrives from the originator.
1760 * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
1761 */
1762 static void sta_rx_agg_session_timer_expired(unsigned long data)
1763 {
1764 /* not an elegant detour, but there is no choice as the timer passes
1765 * only one argument, and various sta_info are needed here, so init
1766 * flow in sta_info_create gives the TID as data, while the timer_to_id
1767 * array gives the sta through container_of */
1768 u8 *ptid = (u8 *)data;
1769 u8 *timer_to_id = ptid - *ptid;
1770 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
1771 timer_to_tid[0]);
1772
1773 #ifdef CONFIG_MAC80211_HT_DEBUG
1774 printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
1775 #endif
1776 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->addr,
1777 (u16)*ptid, WLAN_BACK_TIMER,
1778 WLAN_REASON_QSTA_TIMEOUT);
1779 }
1780
1781 void ieee80211_sta_tear_down_BA_sessions(struct ieee80211_sub_if_data *sdata, u8 *addr)
1782 {
1783 struct ieee80211_local *local = sdata->local;
1784 int i;
1785
1786 for (i = 0; i < STA_TID_NUM; i++) {
1787 ieee80211_stop_tx_ba_session(&local->hw, addr, i,
1788 WLAN_BACK_INITIATOR);
1789 ieee80211_sta_stop_rx_ba_session(sdata, addr, i,
1790 WLAN_BACK_RECIPIENT,
1791 WLAN_REASON_QSTA_LEAVE_QBSS);
1792 }
1793 }
1794
1795 static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
1796 struct ieee80211_msrment_ie *request_ie,
1797 const u8 *da, const u8 *bssid,
1798 u8 dialog_token)
1799 {
1800 struct ieee80211_local *local = sdata->local;
1801 struct sk_buff *skb;
1802 struct ieee80211_mgmt *msr_report;
1803
1804 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
1805 sizeof(struct ieee80211_msrment_ie));
1806
1807 if (!skb) {
1808 printk(KERN_ERR "%s: failed to allocate buffer for "
1809 "measurement report frame\n", sdata->dev->name);
1810 return;
1811 }
1812
1813 skb_reserve(skb, local->hw.extra_tx_headroom);
1814 msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
1815 memset(msr_report, 0, 24);
1816 memcpy(msr_report->da, da, ETH_ALEN);
1817 memcpy(msr_report->sa, sdata->dev->dev_addr, ETH_ALEN);
1818 memcpy(msr_report->bssid, bssid, ETH_ALEN);
1819 msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1820 IEEE80211_STYPE_ACTION);
1821
1822 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
1823 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
1824 msr_report->u.action.u.measurement.action_code =
1825 WLAN_ACTION_SPCT_MSR_RPRT;
1826 msr_report->u.action.u.measurement.dialog_token = dialog_token;
1827
1828 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
1829 msr_report->u.action.u.measurement.length =
1830 sizeof(struct ieee80211_msrment_ie);
1831
1832 memset(&msr_report->u.action.u.measurement.msr_elem, 0,
1833 sizeof(struct ieee80211_msrment_ie));
1834 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
1835 msr_report->u.action.u.measurement.msr_elem.mode |=
1836 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
1837 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
1838
1839 ieee80211_sta_tx(sdata, skb, 0);
1840 }
1841
1842 static void ieee80211_sta_process_measurement_req(struct ieee80211_sub_if_data *sdata,
1843 struct ieee80211_mgmt *mgmt,
1844 size_t len)
1845 {
1846 /*
1847 * Ignoring measurement request is spec violation.
1848 * Mandatory measurements must be reported optional
1849 * measurements might be refused or reported incapable
1850 * For now just refuse
1851 * TODO: Answer basic measurement as unmeasured
1852 */
1853 ieee80211_send_refuse_measurement_request(sdata,
1854 &mgmt->u.action.u.measurement.msr_elem,
1855 mgmt->sa, mgmt->bssid,
1856 mgmt->u.action.u.measurement.dialog_token);
1857 }
1858
1859
1860 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1861 struct ieee80211_if_sta *ifsta,
1862 struct ieee80211_mgmt *mgmt,
1863 size_t len)
1864 {
1865 u16 auth_alg, auth_transaction, status_code;
1866 DECLARE_MAC_BUF(mac);
1867
1868 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1869 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1870 return;
1871
1872 if (len < 24 + 6)
1873 return;
1874
1875 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1876 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1877 return;
1878
1879 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1880 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1881 return;
1882
1883 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1884 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1885 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1886
1887 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1888 /*
1889 * IEEE 802.11 standard does not require authentication in IBSS
1890 * networks and most implementations do not seem to use it.
1891 * However, try to reply to authentication attempts if someone
1892 * has actually implemented this.
1893 */
1894 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1895 return;
1896 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1897 }
1898
1899 if (auth_alg != ifsta->auth_alg ||
1900 auth_transaction != ifsta->auth_transaction)
1901 return;
1902
1903 if (status_code != WLAN_STATUS_SUCCESS) {
1904 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1905 u8 algs[3];
1906 const int num_algs = ARRAY_SIZE(algs);
1907 int i, pos;
1908 algs[0] = algs[1] = algs[2] = 0xff;
1909 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1910 algs[0] = WLAN_AUTH_OPEN;
1911 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1912 algs[1] = WLAN_AUTH_SHARED_KEY;
1913 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1914 algs[2] = WLAN_AUTH_LEAP;
1915 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1916 pos = 0;
1917 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1918 pos = 1;
1919 else
1920 pos = 2;
1921 for (i = 0; i < num_algs; i++) {
1922 pos++;
1923 if (pos >= num_algs)
1924 pos = 0;
1925 if (algs[pos] == ifsta->auth_alg ||
1926 algs[pos] == 0xff)
1927 continue;
1928 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1929 !ieee80211_sta_wep_configured(sdata))
1930 continue;
1931 ifsta->auth_alg = algs[pos];
1932 break;
1933 }
1934 }
1935 return;
1936 }
1937
1938 switch (ifsta->auth_alg) {
1939 case WLAN_AUTH_OPEN:
1940 case WLAN_AUTH_LEAP:
1941 ieee80211_auth_completed(sdata, ifsta);
1942 break;
1943 case WLAN_AUTH_SHARED_KEY:
1944 if (ifsta->auth_transaction == 4)
1945 ieee80211_auth_completed(sdata, ifsta);
1946 else
1947 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1948 break;
1949 }
1950 }
1951
1952
1953 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1954 struct ieee80211_if_sta *ifsta,
1955 struct ieee80211_mgmt *mgmt,
1956 size_t len)
1957 {
1958 u16 reason_code;
1959 DECLARE_MAC_BUF(mac);
1960
1961 if (len < 24 + 2)
1962 return;
1963
1964 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1965 return;
1966
1967 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1968
1969 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1970 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
1971
1972 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1973 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1974 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1975 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1976 mod_timer(&ifsta->timer, jiffies +
1977 IEEE80211_RETRY_AUTH_INTERVAL);
1978 }
1979
1980 ieee80211_set_disassoc(sdata, ifsta, 1);
1981 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1982 }
1983
1984
1985 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1986 struct ieee80211_if_sta *ifsta,
1987 struct ieee80211_mgmt *mgmt,
1988 size_t len)
1989 {
1990 u16 reason_code;
1991 DECLARE_MAC_BUF(mac);
1992
1993 if (len < 24 + 2)
1994 return;
1995
1996 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1997 return;
1998
1999 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2000
2001 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
2002 printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name);
2003
2004 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
2005 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
2006 mod_timer(&ifsta->timer, jiffies +
2007 IEEE80211_RETRY_AUTH_INTERVAL);
2008 }
2009
2010 ieee80211_set_disassoc(sdata, ifsta, 0);
2011 }
2012
2013
2014 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2015 struct ieee80211_if_sta *ifsta,
2016 struct ieee80211_mgmt *mgmt,
2017 size_t len,
2018 int reassoc)
2019 {
2020 struct ieee80211_local *local = sdata->local;
2021 struct ieee80211_supported_band *sband;
2022 struct sta_info *sta;
2023 u64 rates, basic_rates;
2024 u16 capab_info, status_code, aid;
2025 struct ieee802_11_elems elems;
2026 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
2027 u8 *pos;
2028 int i, j;
2029 DECLARE_MAC_BUF(mac);
2030 bool have_higher_than_11mbit = false;
2031
2032 /* AssocResp and ReassocResp have identical structure, so process both
2033 * of them in this function. */
2034
2035 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
2036 return;
2037
2038 if (len < 24 + 6)
2039 return;
2040
2041 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
2042 return;
2043
2044 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2045 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2046 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2047
2048 printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
2049 "status=%d aid=%d)\n",
2050 sdata->dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
2051 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2052
2053 if (status_code != WLAN_STATUS_SUCCESS) {
2054 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
2055 sdata->dev->name, status_code);
2056 /* if this was a reassociation, ensure we try a "full"
2057 * association next time. This works around some broken APs
2058 * which do not correctly reject reassociation requests. */
2059 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2060 return;
2061 }
2062
2063 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2064 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
2065 "set\n", sdata->dev->name, aid);
2066 aid &= ~(BIT(15) | BIT(14));
2067
2068 pos = mgmt->u.assoc_resp.variable;
2069 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2070
2071 if (!elems.supp_rates) {
2072 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2073 sdata->dev->name);
2074 return;
2075 }
2076
2077 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
2078 ifsta->aid = aid;
2079 ifsta->ap_capab = capab_info;
2080
2081 kfree(ifsta->assocresp_ies);
2082 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
2083 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
2084 if (ifsta->assocresp_ies)
2085 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
2086
2087 rcu_read_lock();
2088
2089 /* Add STA entry for the AP */
2090 sta = sta_info_get(local, ifsta->bssid);
2091 if (!sta) {
2092 struct ieee80211_sta_bss *bss;
2093 int err;
2094
2095 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
2096 if (!sta) {
2097 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
2098 " the AP\n", sdata->dev->name);
2099 rcu_read_unlock();
2100 return;
2101 }
2102 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
2103 local->hw.conf.channel->center_freq,
2104 ifsta->ssid, ifsta->ssid_len);
2105 if (bss) {
2106 sta->last_signal = bss->signal;
2107 sta->last_qual = bss->qual;
2108 sta->last_noise = bss->noise;
2109 ieee80211_rx_bss_put(local, bss);
2110 }
2111
2112 err = sta_info_insert(sta);
2113 if (err) {
2114 printk(KERN_DEBUG "%s: failed to insert STA entry for"
2115 " the AP (error %d)\n", sdata->dev->name, err);
2116 rcu_read_unlock();
2117 return;
2118 }
2119 /* update new sta with its last rx activity */
2120 sta->last_rx = jiffies;
2121 }
2122
2123 /*
2124 * FIXME: Do we really need to update the sta_info's information here?
2125 * We already know about the AP (we found it in our list) so it
2126 * should already be filled with the right info, no?
2127 * As is stands, all this is racy because typically we assume
2128 * the information that is filled in here (except flags) doesn't
2129 * change while a STA structure is alive. As such, it should move
2130 * to between the sta_info_alloc() and sta_info_insert() above.
2131 */
2132
2133 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
2134 WLAN_STA_AUTHORIZED);
2135
2136 rates = 0;
2137 basic_rates = 0;
2138 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2139
2140 for (i = 0; i < elems.supp_rates_len; i++) {
2141 int rate = (elems.supp_rates[i] & 0x7f) * 5;
2142
2143 if (rate > 110)
2144 have_higher_than_11mbit = true;
2145
2146 for (j = 0; j < sband->n_bitrates; j++) {
2147 if (sband->bitrates[j].bitrate == rate)
2148 rates |= BIT(j);
2149 if (elems.supp_rates[i] & 0x80)
2150 basic_rates |= BIT(j);
2151 }
2152 }
2153
2154 for (i = 0; i < elems.ext_supp_rates_len; i++) {
2155 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
2156
2157 if (rate > 110)
2158 have_higher_than_11mbit = true;
2159
2160 for (j = 0; j < sband->n_bitrates; j++) {
2161 if (sband->bitrates[j].bitrate == rate)
2162 rates |= BIT(j);
2163 if (elems.ext_supp_rates[i] & 0x80)
2164 basic_rates |= BIT(j);
2165 }
2166 }
2167
2168 sta->supp_rates[local->hw.conf.channel->band] = rates;
2169 sdata->basic_rates = basic_rates;
2170
2171 /* cf. IEEE 802.11 9.2.12 */
2172 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
2173 have_higher_than_11mbit)
2174 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
2175 else
2176 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
2177
2178 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2179 (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
2180 struct ieee80211_ht_bss_info bss_info;
2181 ieee80211_ht_cap_ie_to_ht_info(
2182 (struct ieee80211_ht_cap *)
2183 elems.ht_cap_elem, &sta->ht_info);
2184 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2185 (struct ieee80211_ht_addt_info *)
2186 elems.ht_info_elem, &bss_info);
2187 ieee80211_handle_ht(local, 1, &sta->ht_info, &bss_info);
2188 }
2189
2190 rate_control_rate_init(sta, local);
2191
2192 if (elems.wmm_param) {
2193 set_sta_flags(sta, WLAN_STA_WME);
2194 rcu_read_unlock();
2195 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
2196 elems.wmm_param_len);
2197 } else
2198 rcu_read_unlock();
2199
2200 /* set AID and assoc capability,
2201 * ieee80211_set_associated() will tell the driver */
2202 bss_conf->aid = aid;
2203 bss_conf->assoc_capability = capab_info;
2204 ieee80211_set_associated(sdata, ifsta, 1);
2205
2206 ieee80211_associated(sdata, ifsta);
2207 }
2208
2209
2210 /* Caller must hold local->sta_bss_lock */
2211 static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
2212 struct ieee80211_sta_bss *bss)
2213 {
2214 u8 hash_idx;
2215
2216 if (bss_mesh_cfg(bss))
2217 hash_idx = mesh_id_hash(bss_mesh_id(bss),
2218 bss_mesh_id_len(bss));
2219 else
2220 hash_idx = STA_HASH(bss->bssid);
2221
2222 bss->hnext = local->sta_bss_hash[hash_idx];
2223 local->sta_bss_hash[hash_idx] = bss;
2224 }
2225
2226
2227 /* Caller must hold local->sta_bss_lock */
2228 static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
2229 struct ieee80211_sta_bss *bss)
2230 {
2231 struct ieee80211_sta_bss *b, *prev = NULL;
2232 b = local->sta_bss_hash[STA_HASH(bss->bssid)];
2233 while (b) {
2234 if (b == bss) {
2235 if (!prev)
2236 local->sta_bss_hash[STA_HASH(bss->bssid)] =
2237 bss->hnext;
2238 else
2239 prev->hnext = bss->hnext;
2240 break;
2241 }
2242 prev = b;
2243 b = b->hnext;
2244 }
2245 }
2246
2247
2248 static struct ieee80211_sta_bss *
2249 ieee80211_rx_bss_add(struct ieee80211_sub_if_data *sdata, u8 *bssid, int freq,
2250 u8 *ssid, u8 ssid_len)
2251 {
2252 struct ieee80211_local *local = sdata->local;
2253 struct ieee80211_sta_bss *bss;
2254
2255 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2256 if (!bss)
2257 return NULL;
2258 atomic_inc(&bss->users);
2259 atomic_inc(&bss->users);
2260 memcpy(bss->bssid, bssid, ETH_ALEN);
2261 bss->freq = freq;
2262 if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
2263 memcpy(bss->ssid, ssid, ssid_len);
2264 bss->ssid_len = ssid_len;
2265 }
2266
2267 spin_lock_bh(&local->sta_bss_lock);
2268 /* TODO: order by RSSI? */
2269 list_add_tail(&bss->list, &local->sta_bss_list);
2270 __ieee80211_rx_bss_hash_add(local, bss);
2271 spin_unlock_bh(&local->sta_bss_lock);
2272 return bss;
2273 }
2274
2275 static struct ieee80211_sta_bss *
2276 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
2277 u8 *ssid, u8 ssid_len)
2278 {
2279 struct ieee80211_sta_bss *bss;
2280
2281 spin_lock_bh(&local->sta_bss_lock);
2282 bss = local->sta_bss_hash[STA_HASH(bssid)];
2283 while (bss) {
2284 if (!bss_mesh_cfg(bss) &&
2285 !memcmp(bss->bssid, bssid, ETH_ALEN) &&
2286 bss->freq == freq &&
2287 bss->ssid_len == ssid_len &&
2288 (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
2289 atomic_inc(&bss->users);
2290 break;
2291 }
2292 bss = bss->hnext;
2293 }
2294 spin_unlock_bh(&local->sta_bss_lock);
2295 return bss;
2296 }
2297
2298 #ifdef CONFIG_MAC80211_MESH
2299 static struct ieee80211_sta_bss *
2300 ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
2301 u8 *mesh_cfg, int freq)
2302 {
2303 struct ieee80211_sta_bss *bss;
2304
2305 spin_lock_bh(&local->sta_bss_lock);
2306 bss = local->sta_bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
2307 while (bss) {
2308 if (bss_mesh_cfg(bss) &&
2309 !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
2310 bss->freq == freq &&
2311 mesh_id_len == bss->mesh_id_len &&
2312 (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
2313 mesh_id_len))) {
2314 atomic_inc(&bss->users);
2315 break;
2316 }
2317 bss = bss->hnext;
2318 }
2319 spin_unlock_bh(&local->sta_bss_lock);
2320 return bss;
2321 }
2322
2323 static struct ieee80211_sta_bss *
2324 ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
2325 u8 *mesh_cfg, int mesh_config_len, int freq)
2326 {
2327 struct ieee80211_sta_bss *bss;
2328
2329 if (mesh_config_len != MESH_CFG_LEN)
2330 return NULL;
2331
2332 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2333 if (!bss)
2334 return NULL;
2335
2336 bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
2337 if (!bss->mesh_cfg) {
2338 kfree(bss);
2339 return NULL;
2340 }
2341
2342 if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
2343 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
2344 if (!bss->mesh_id) {
2345 kfree(bss->mesh_cfg);
2346 kfree(bss);
2347 return NULL;
2348 }
2349 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
2350 }
2351
2352 atomic_inc(&bss->users);
2353 atomic_inc(&bss->users);
2354 memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
2355 bss->mesh_id_len = mesh_id_len;
2356 bss->freq = freq;
2357 spin_lock_bh(&local->sta_bss_lock);
2358 /* TODO: order by RSSI? */
2359 list_add_tail(&bss->list, &local->sta_bss_list);
2360 __ieee80211_rx_bss_hash_add(local, bss);
2361 spin_unlock_bh(&local->sta_bss_lock);
2362 return bss;
2363 }
2364 #endif
2365
2366 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
2367 {
2368 kfree(bss->ies);
2369 kfree(bss_mesh_id(bss));
2370 kfree(bss_mesh_cfg(bss));
2371 kfree(bss);
2372 }
2373
2374
2375 static void ieee80211_rx_bss_put(struct ieee80211_local *local,
2376 struct ieee80211_sta_bss *bss)
2377 {
2378 local_bh_disable();
2379 if (!atomic_dec_and_lock(&bss->users, &local->sta_bss_lock)) {
2380 local_bh_enable();
2381 return;
2382 }
2383
2384 __ieee80211_rx_bss_hash_del(local, bss);
2385 list_del(&bss->list);
2386 spin_unlock_bh(&local->sta_bss_lock);
2387 ieee80211_rx_bss_free(bss);
2388 }
2389
2390
2391 void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
2392 {
2393 spin_lock_init(&local->sta_bss_lock);
2394 INIT_LIST_HEAD(&local->sta_bss_list);
2395 }
2396
2397
2398 void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
2399 {
2400 struct ieee80211_sta_bss *bss, *tmp;
2401
2402 list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
2403 ieee80211_rx_bss_put(local, bss);
2404 }
2405
2406
2407 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
2408 struct ieee80211_if_sta *ifsta,
2409 struct ieee80211_sta_bss *bss)
2410 {
2411 struct ieee80211_local *local = sdata->local;
2412 int res, rates, i, j;
2413 struct sk_buff *skb;
2414 struct ieee80211_mgmt *mgmt;
2415 u8 *pos;
2416 struct ieee80211_supported_band *sband;
2417 union iwreq_data wrqu;
2418
2419 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2420
2421 /* Remove possible STA entries from other IBSS networks. */
2422 sta_info_flush_delayed(sdata);
2423
2424 if (local->ops->reset_tsf) {
2425 /* Reset own TSF to allow time synchronization work. */
2426 local->ops->reset_tsf(local_to_hw(local));
2427 }
2428 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2429 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2430 if (res)
2431 return res;
2432
2433 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2434
2435 sdata->drop_unencrypted = bss->capability &
2436 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2437
2438 res = ieee80211_set_freq(sdata, bss->freq);
2439
2440 if (res)
2441 return res;
2442
2443 /* Build IBSS probe response */
2444 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2445 if (skb) {
2446 skb_reserve(skb, local->hw.extra_tx_headroom);
2447
2448 mgmt = (struct ieee80211_mgmt *)
2449 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2450 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2451 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2452 IEEE80211_STYPE_PROBE_RESP);
2453 memset(mgmt->da, 0xff, ETH_ALEN);
2454 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
2455 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2456 mgmt->u.beacon.beacon_int =
2457 cpu_to_le16(local->hw.conf.beacon_int);
2458 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
2459 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2460
2461 pos = skb_put(skb, 2 + ifsta->ssid_len);
2462 *pos++ = WLAN_EID_SSID;
2463 *pos++ = ifsta->ssid_len;
2464 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2465
2466 rates = bss->supp_rates_len;
2467 if (rates > 8)
2468 rates = 8;
2469 pos = skb_put(skb, 2 + rates);
2470 *pos++ = WLAN_EID_SUPP_RATES;
2471 *pos++ = rates;
2472 memcpy(pos, bss->supp_rates, rates);
2473
2474 if (bss->band == IEEE80211_BAND_2GHZ) {
2475 pos = skb_put(skb, 2 + 1);
2476 *pos++ = WLAN_EID_DS_PARAMS;
2477 *pos++ = 1;
2478 *pos++ = ieee80211_frequency_to_channel(bss->freq);
2479 }
2480
2481 pos = skb_put(skb, 2 + 2);
2482 *pos++ = WLAN_EID_IBSS_PARAMS;
2483 *pos++ = 2;
2484 /* FIX: set ATIM window based on scan results */
2485 *pos++ = 0;
2486 *pos++ = 0;
2487
2488 if (bss->supp_rates_len > 8) {
2489 rates = bss->supp_rates_len - 8;
2490 pos = skb_put(skb, 2 + rates);
2491 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2492 *pos++ = rates;
2493 memcpy(pos, &bss->supp_rates[8], rates);
2494 }
2495
2496 ifsta->probe_resp = skb;
2497
2498 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
2499 }
2500
2501 rates = 0;
2502 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2503 for (i = 0; i < bss->supp_rates_len; i++) {
2504 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2505 for (j = 0; j < sband->n_bitrates; j++)
2506 if (sband->bitrates[j].bitrate == bitrate)
2507 rates |= BIT(j);
2508 }
2509 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
2510
2511 ieee80211_sta_def_wmm_params(sdata, bss, 1);
2512
2513 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
2514 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2515
2516 memset(&wrqu, 0, sizeof(wrqu));
2517 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2518 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
2519
2520 return res;
2521 }
2522
2523 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
2524 struct ieee802_11_elems *elems,
2525 enum ieee80211_band band)
2526 {
2527 struct ieee80211_supported_band *sband;
2528 struct ieee80211_rate *bitrates;
2529 size_t num_rates;
2530 u64 supp_rates;
2531 int i, j;
2532 sband = local->hw.wiphy->bands[band];
2533
2534 if (!sband) {
2535 WARN_ON(1);
2536 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2537 }
2538
2539 bitrates = sband->bitrates;
2540 num_rates = sband->n_bitrates;
2541 supp_rates = 0;
2542 for (i = 0; i < elems->supp_rates_len +
2543 elems->ext_supp_rates_len; i++) {
2544 u8 rate = 0;
2545 int own_rate;
2546 if (i < elems->supp_rates_len)
2547 rate = elems->supp_rates[i];
2548 else if (elems->ext_supp_rates)
2549 rate = elems->ext_supp_rates
2550 [i - elems->supp_rates_len];
2551 own_rate = 5 * (rate & 0x7f);
2552 for (j = 0; j < num_rates; j++)
2553 if (bitrates[j].bitrate == own_rate)
2554 supp_rates |= BIT(j);
2555 }
2556 return supp_rates;
2557 }
2558
2559 static u64 ieee80211_sta_get_mandatory_rates(struct ieee80211_local *local,
2560 enum ieee80211_band band)
2561 {
2562 struct ieee80211_supported_band *sband;
2563 struct ieee80211_rate *bitrates;
2564 u64 mandatory_rates;
2565 enum ieee80211_rate_flags mandatory_flag;
2566 int i;
2567
2568 sband = local->hw.wiphy->bands[band];
2569 if (!sband) {
2570 WARN_ON(1);
2571 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2572 }
2573
2574 if (band == IEEE80211_BAND_2GHZ)
2575 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
2576 else
2577 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
2578
2579 bitrates = sband->bitrates;
2580 mandatory_rates = 0;
2581 for (i = 0; i < sband->n_bitrates; i++)
2582 if (bitrates[i].flags & mandatory_flag)
2583 mandatory_rates |= BIT(i);
2584 return mandatory_rates;
2585 }
2586
2587 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2588 struct ieee80211_mgmt *mgmt,
2589 size_t len,
2590 struct ieee80211_rx_status *rx_status,
2591 struct ieee802_11_elems *elems)
2592 {
2593 struct ieee80211_local *local = sdata->local;
2594 int freq, clen;
2595 struct ieee80211_sta_bss *bss;
2596 struct sta_info *sta;
2597 struct ieee80211_channel *channel;
2598 u64 beacon_timestamp, rx_timestamp;
2599 u64 supp_rates = 0;
2600 bool beacon = ieee80211_is_beacon(mgmt->frame_control);
2601 enum ieee80211_band band = rx_status->band;
2602 DECLARE_MAC_BUF(mac);
2603 DECLARE_MAC_BUF(mac2);
2604
2605 if (elems->ds_params && elems->ds_params_len == 1)
2606 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
2607 else
2608 freq = rx_status->freq;
2609
2610 channel = ieee80211_get_channel(local->hw.wiphy, freq);
2611
2612 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2613 return;
2614
2615 if (ieee80211_vif_is_mesh(&sdata->vif) && elems->mesh_id &&
2616 elems->mesh_config && mesh_matches_local(elems, sdata)) {
2617 supp_rates = ieee80211_sta_get_rates(local, elems, band);
2618
2619 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
2620 mesh_peer_accepts_plinks(elems));
2621 }
2622
2623 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && elems->supp_rates &&
2624 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
2625 supp_rates = ieee80211_sta_get_rates(local, elems, band);
2626
2627 rcu_read_lock();
2628
2629 sta = sta_info_get(local, mgmt->sa);
2630 if (sta) {
2631 u64 prev_rates;
2632
2633 prev_rates = sta->supp_rates[band];
2634 /* make sure mandatory rates are always added */
2635 sta->supp_rates[band] = supp_rates |
2636 ieee80211_sta_get_mandatory_rates(local, band);
2637
2638 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2639 if (sta->supp_rates[band] != prev_rates)
2640 printk(KERN_DEBUG "%s: updated supp_rates set "
2641 "for %s based on beacon info (0x%llx | "
2642 "0x%llx -> 0x%llx)\n",
2643 sdata->dev->name, print_mac(mac, sta->addr),
2644 (unsigned long long) prev_rates,
2645 (unsigned long long) supp_rates,
2646 (unsigned long long) sta->supp_rates[band]);
2647 #endif
2648 } else {
2649 ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
2650 mgmt->sa, supp_rates);
2651 }
2652
2653 rcu_read_unlock();
2654 }
2655
2656 #ifdef CONFIG_MAC80211_MESH
2657 if (elems->mesh_config)
2658 bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id,
2659 elems->mesh_id_len, elems->mesh_config, freq);
2660 else
2661 #endif
2662 bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq,
2663 elems->ssid, elems->ssid_len);
2664 if (!bss) {
2665 #ifdef CONFIG_MAC80211_MESH
2666 if (elems->mesh_config)
2667 bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id,
2668 elems->mesh_id_len, elems->mesh_config,
2669 elems->mesh_config_len, freq);
2670 else
2671 #endif
2672 bss = ieee80211_rx_bss_add(sdata, mgmt->bssid, freq,
2673 elems->ssid, elems->ssid_len);
2674 if (!bss)
2675 return;
2676 } else {
2677 #if 0
2678 /* TODO: order by RSSI? */
2679 spin_lock_bh(&local->sta_bss_lock);
2680 list_move_tail(&bss->list, &local->sta_bss_list);
2681 spin_unlock_bh(&local->sta_bss_lock);
2682 #endif
2683 }
2684
2685 /* save the ERP value so that it is available at association time */
2686 if (elems->erp_info && elems->erp_info_len >= 1) {
2687 bss->erp_value = elems->erp_info[0];
2688 bss->has_erp_value = 1;
2689 }
2690
2691 bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
2692 bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
2693
2694 if (elems->tim) {
2695 struct ieee80211_tim_ie *tim_ie =
2696 (struct ieee80211_tim_ie *)elems->tim;
2697 bss->dtim_period = tim_ie->dtim_period;
2698 }
2699
2700 /* set default value for buggy APs */
2701 if (!elems->tim || bss->dtim_period == 0)
2702 bss->dtim_period = 1;
2703
2704 bss->supp_rates_len = 0;
2705 if (elems->supp_rates) {
2706 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2707 if (clen > elems->supp_rates_len)
2708 clen = elems->supp_rates_len;
2709 memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates,
2710 clen);
2711 bss->supp_rates_len += clen;
2712 }
2713 if (elems->ext_supp_rates) {
2714 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2715 if (clen > elems->ext_supp_rates_len)
2716 clen = elems->ext_supp_rates_len;
2717 memcpy(&bss->supp_rates[bss->supp_rates_len],
2718 elems->ext_supp_rates, clen);
2719 bss->supp_rates_len += clen;
2720 }
2721
2722 bss->band = band;
2723
2724 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
2725
2726 bss->timestamp = beacon_timestamp;
2727 bss->last_update = jiffies;
2728 bss->signal = rx_status->signal;
2729 bss->noise = rx_status->noise;
2730 bss->qual = rx_status->qual;
2731 if (!beacon)
2732 bss->last_probe_resp = jiffies;
2733 /*
2734 * In STA mode, the remaining parameters should not be overridden
2735 * by beacons because they're not necessarily accurate there.
2736 */
2737 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
2738 bss->last_probe_resp && beacon) {
2739 ieee80211_rx_bss_put(local, bss);
2740 return;
2741 }
2742
2743 if (bss->ies == NULL || bss->ies_len < elems->total_len) {
2744 kfree(bss->ies);
2745 bss->ies = kmalloc(elems->total_len, GFP_ATOMIC);
2746 }
2747 if (bss->ies) {
2748 memcpy(bss->ies, elems->ie_start, elems->total_len);
2749 bss->ies_len = elems->total_len;
2750 } else
2751 bss->ies_len = 0;
2752
2753 bss->wmm_used = elems->wmm_param || elems->wmm_info;
2754
2755 /* check if we need to merge IBSS */
2756 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
2757 !local->sta_sw_scanning && !local->sta_hw_scanning &&
2758 bss->capability & WLAN_CAPABILITY_IBSS &&
2759 bss->freq == local->oper_channel->center_freq &&
2760 elems->ssid_len == sdata->u.sta.ssid_len &&
2761 memcmp(elems->ssid, sdata->u.sta.ssid,
2762 sdata->u.sta.ssid_len) == 0) {
2763 if (rx_status->flag & RX_FLAG_TSFT) {
2764 /* in order for correct IBSS merging we need mactime
2765 *
2766 * since mactime is defined as the time the first data
2767 * symbol of the frame hits the PHY, and the timestamp
2768 * of the beacon is defined as "the time that the data
2769 * symbol containing the first bit of the timestamp is
2770 * transmitted to the PHY plus the transmitting STA’s
2771 * delays through its local PHY from the MAC-PHY
2772 * interface to its interface with the WM"
2773 * (802.11 11.1.2) - equals the time this bit arrives at
2774 * the receiver - we have to take into account the
2775 * offset between the two.
2776 * e.g: at 1 MBit that means mactime is 192 usec earlier
2777 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
2778 */
2779 int rate = local->hw.wiphy->bands[band]->
2780 bitrates[rx_status->rate_idx].bitrate;
2781 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
2782 } else if (local && local->ops && local->ops->get_tsf)
2783 /* second best option: get current TSF */
2784 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
2785 else
2786 /* can't merge without knowing the TSF */
2787 rx_timestamp = -1LLU;
2788 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2789 printk(KERN_DEBUG "RX beacon SA=%s BSSID="
2790 "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
2791 print_mac(mac, mgmt->sa),
2792 print_mac(mac2, mgmt->bssid),
2793 (unsigned long long)rx_timestamp,
2794 (unsigned long long)beacon_timestamp,
2795 (unsigned long long)(rx_timestamp - beacon_timestamp),
2796 jiffies);
2797 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2798 if (beacon_timestamp > rx_timestamp) {
2799 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2800 printk(KERN_DEBUG "%s: beacon TSF higher than "
2801 "local TSF - IBSS merge with BSSID %s\n",
2802 sdata->dev->name, print_mac(mac, mgmt->bssid));
2803 #endif
2804 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
2805 ieee80211_ibss_add_sta(sdata, NULL,
2806 mgmt->bssid, mgmt->sa,
2807 supp_rates);
2808 }
2809 }
2810
2811 ieee80211_rx_bss_put(local, bss);
2812 }
2813
2814
2815 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2816 struct ieee80211_mgmt *mgmt,
2817 size_t len,
2818 struct ieee80211_rx_status *rx_status)
2819 {
2820 size_t baselen;
2821 struct ieee802_11_elems elems;
2822 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2823
2824 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
2825 return; /* ignore ProbeResp to foreign address */
2826
2827 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2828 if (baselen > len)
2829 return;
2830
2831 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2832 &elems);
2833
2834 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2835
2836 /* direct probe may be part of the association flow */
2837 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
2838 &ifsta->request)) {
2839 printk(KERN_DEBUG "%s direct probe responded\n",
2840 sdata->dev->name);
2841 ieee80211_authenticate(sdata, ifsta);
2842 }
2843 }
2844
2845
2846 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2847 struct ieee80211_mgmt *mgmt,
2848 size_t len,
2849 struct ieee80211_rx_status *rx_status)
2850 {
2851 struct ieee80211_if_sta *ifsta;
2852 size_t baselen;
2853 struct ieee802_11_elems elems;
2854 struct ieee80211_local *local = sdata->local;
2855 struct ieee80211_conf *conf = &local->hw.conf;
2856 u32 changed = 0;
2857
2858 /* Process beacon from the current BSS */
2859 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2860 if (baselen > len)
2861 return;
2862
2863 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
2864
2865 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2866
2867 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2868 return;
2869 ifsta = &sdata->u.sta;
2870
2871 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
2872 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
2873 return;
2874
2875 /* Do not send changes to driver if we are scanning. This removes
2876 * requirement that a driver's bss_info_changed/conf_tx functions
2877 * need to be atomic.
2878 * This is really ugly code, we should rewrite scanning and make
2879 * all this more understandable for humans.
2880 */
2881 if (local->sta_sw_scanning || local->sta_hw_scanning)
2882 return;
2883
2884 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
2885 elems.wmm_param_len);
2886
2887 if (elems.erp_info && elems.erp_info_len >= 1)
2888 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
2889 else {
2890 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
2891 changed |= ieee80211_handle_protect_preamb(sdata, false,
2892 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
2893 }
2894
2895 if (elems.ht_cap_elem && elems.ht_info_elem &&
2896 elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
2897 struct ieee80211_ht_bss_info bss_info;
2898
2899 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2900 (struct ieee80211_ht_addt_info *)
2901 elems.ht_info_elem, &bss_info);
2902 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
2903 &bss_info);
2904 }
2905
2906 ieee80211_bss_info_change_notify(sdata, changed);
2907 }
2908
2909
2910 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
2911 struct ieee80211_if_sta *ifsta,
2912 struct ieee80211_mgmt *mgmt,
2913 size_t len,
2914 struct ieee80211_rx_status *rx_status)
2915 {
2916 struct ieee80211_local *local = sdata->local;
2917 int tx_last_beacon;
2918 struct sk_buff *skb;
2919 struct ieee80211_mgmt *resp;
2920 u8 *pos, *end;
2921 DECLARE_MAC_BUF(mac);
2922 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2923 DECLARE_MAC_BUF(mac2);
2924 DECLARE_MAC_BUF(mac3);
2925 #endif
2926
2927 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS ||
2928 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
2929 len < 24 + 2 || !ifsta->probe_resp)
2930 return;
2931
2932 if (local->ops->tx_last_beacon)
2933 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2934 else
2935 tx_last_beacon = 1;
2936
2937 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2938 printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
2939 "%s (tx_last_beacon=%d)\n",
2940 sdata->dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
2941 print_mac(mac3, mgmt->bssid), tx_last_beacon);
2942 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2943
2944 if (!tx_last_beacon)
2945 return;
2946
2947 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2948 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2949 return;
2950
2951 end = ((u8 *) mgmt) + len;
2952 pos = mgmt->u.probe_req.variable;
2953 if (pos[0] != WLAN_EID_SSID ||
2954 pos + 2 + pos[1] > end) {
2955 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2956 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2957 "from %s\n",
2958 sdata->dev->name, print_mac(mac, mgmt->sa));
2959 #endif
2960 return;
2961 }
2962 if (pos[1] != 0 &&
2963 (pos[1] != ifsta->ssid_len ||
2964 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
2965 /* Ignore ProbeReq for foreign SSID */
2966 return;
2967 }
2968
2969 /* Reply with ProbeResp */
2970 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
2971 if (!skb)
2972 return;
2973
2974 resp = (struct ieee80211_mgmt *) skb->data;
2975 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2976 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2977 printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
2978 sdata->dev->name, print_mac(mac, resp->da));
2979 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2980 ieee80211_sta_tx(sdata, skb, 0);
2981 }
2982
2983 static void ieee80211_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
2984 struct ieee80211_if_sta *ifsta,
2985 struct ieee80211_mgmt *mgmt,
2986 size_t len,
2987 struct ieee80211_rx_status *rx_status)
2988 {
2989 struct ieee80211_local *local = sdata->local;
2990
2991 /* all categories we currently handle have action_code */
2992 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2993 return;
2994
2995 switch (mgmt->u.action.category) {
2996 case WLAN_CATEGORY_SPECTRUM_MGMT:
2997 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2998 break;
2999 switch (mgmt->u.action.u.chan_switch.action_code) {
3000 case WLAN_ACTION_SPCT_MSR_REQ:
3001 if (len < (IEEE80211_MIN_ACTION_SIZE +
3002 sizeof(mgmt->u.action.u.measurement)))
3003 break;
3004 ieee80211_sta_process_measurement_req(sdata, mgmt, len);
3005 break;
3006 }
3007 break;
3008 case WLAN_CATEGORY_BACK:
3009 switch (mgmt->u.action.u.addba_req.action_code) {
3010 case WLAN_ACTION_ADDBA_REQ:
3011 if (len < (IEEE80211_MIN_ACTION_SIZE +
3012 sizeof(mgmt->u.action.u.addba_req)))
3013 break;
3014 ieee80211_sta_process_addba_request(local, mgmt, len);
3015 break;
3016 case WLAN_ACTION_ADDBA_RESP:
3017 if (len < (IEEE80211_MIN_ACTION_SIZE +
3018 sizeof(mgmt->u.action.u.addba_resp)))
3019 break;
3020 ieee80211_sta_process_addba_resp(local, mgmt, len);
3021 break;
3022 case WLAN_ACTION_DELBA:
3023 if (len < (IEEE80211_MIN_ACTION_SIZE +
3024 sizeof(mgmt->u.action.u.delba)))
3025 break;
3026 ieee80211_sta_process_delba(sdata, mgmt, len);
3027 break;
3028 }
3029 break;
3030 case PLINK_CATEGORY:
3031 if (ieee80211_vif_is_mesh(&sdata->vif))
3032 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
3033 break;
3034 case MESH_PATH_SEL_CATEGORY:
3035 if (ieee80211_vif_is_mesh(&sdata->vif))
3036 mesh_rx_path_sel_frame(sdata, mgmt, len);
3037 break;
3038 }
3039 }
3040
3041 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
3042 struct ieee80211_rx_status *rx_status)
3043 {
3044 struct ieee80211_local *local = sdata->local;
3045 struct ieee80211_if_sta *ifsta;
3046 struct ieee80211_mgmt *mgmt;
3047 u16 fc;
3048
3049 if (skb->len < 24)
3050 goto fail;
3051
3052 ifsta = &sdata->u.sta;
3053
3054 mgmt = (struct ieee80211_mgmt *) skb->data;
3055 fc = le16_to_cpu(mgmt->frame_control);
3056
3057 switch (fc & IEEE80211_FCTL_STYPE) {
3058 case IEEE80211_STYPE_PROBE_REQ:
3059 case IEEE80211_STYPE_PROBE_RESP:
3060 case IEEE80211_STYPE_BEACON:
3061 case IEEE80211_STYPE_ACTION:
3062 memcpy(skb->cb, rx_status, sizeof(*rx_status));
3063 case IEEE80211_STYPE_AUTH:
3064 case IEEE80211_STYPE_ASSOC_RESP:
3065 case IEEE80211_STYPE_REASSOC_RESP:
3066 case IEEE80211_STYPE_DEAUTH:
3067 case IEEE80211_STYPE_DISASSOC:
3068 skb_queue_tail(&ifsta->skb_queue, skb);
3069 queue_work(local->hw.workqueue, &ifsta->work);
3070 return;
3071 }
3072
3073 fail:
3074 kfree_skb(skb);
3075 }
3076
3077 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3078 struct sk_buff *skb)
3079 {
3080 struct ieee80211_rx_status *rx_status;
3081 struct ieee80211_if_sta *ifsta;
3082 struct ieee80211_mgmt *mgmt;
3083 u16 fc;
3084
3085 ifsta = &sdata->u.sta;
3086
3087 rx_status = (struct ieee80211_rx_status *) skb->cb;
3088 mgmt = (struct ieee80211_mgmt *) skb->data;
3089 fc = le16_to_cpu(mgmt->frame_control);
3090
3091 switch (fc & IEEE80211_FCTL_STYPE) {
3092 case IEEE80211_STYPE_PROBE_REQ:
3093 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
3094 rx_status);
3095 break;
3096 case IEEE80211_STYPE_PROBE_RESP:
3097 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
3098 break;
3099 case IEEE80211_STYPE_BEACON:
3100 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3101 break;
3102 case IEEE80211_STYPE_AUTH:
3103 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
3104 break;
3105 case IEEE80211_STYPE_ASSOC_RESP:
3106 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
3107 break;
3108 case IEEE80211_STYPE_REASSOC_RESP:
3109 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
3110 break;
3111 case IEEE80211_STYPE_DEAUTH:
3112 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
3113 break;
3114 case IEEE80211_STYPE_DISASSOC:
3115 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
3116 break;
3117 case IEEE80211_STYPE_ACTION:
3118 ieee80211_rx_mgmt_action(sdata, ifsta, mgmt, skb->len, rx_status);
3119 break;
3120 }
3121
3122 kfree_skb(skb);
3123 }
3124
3125
3126 ieee80211_rx_result
3127 ieee80211_sta_rx_scan(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
3128 struct ieee80211_rx_status *rx_status)
3129 {
3130 struct ieee80211_mgmt *mgmt;
3131 __le16 fc;
3132
3133 if (skb->len < 2)
3134 return RX_DROP_UNUSABLE;
3135
3136 mgmt = (struct ieee80211_mgmt *) skb->data;
3137 fc = mgmt->frame_control;
3138
3139 if (ieee80211_is_ctl(fc))
3140 return RX_CONTINUE;
3141
3142 if (skb->len < 24)
3143 return RX_DROP_MONITOR;
3144
3145 if (ieee80211_is_probe_resp(fc)) {
3146 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
3147 dev_kfree_skb(skb);
3148 return RX_QUEUED;
3149 }
3150
3151 if (ieee80211_is_beacon(fc)) {
3152 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3153 dev_kfree_skb(skb);
3154 return RX_QUEUED;
3155 }
3156
3157 return RX_CONTINUE;
3158 }
3159
3160
3161 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
3162 {
3163 struct ieee80211_local *local = sdata->local;
3164 int active = 0;
3165 struct sta_info *sta;
3166
3167 rcu_read_lock();
3168
3169 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3170 if (sta->sdata == sdata &&
3171 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
3172 jiffies)) {
3173 active++;
3174 break;
3175 }
3176 }
3177
3178 rcu_read_unlock();
3179
3180 return active;
3181 }
3182
3183
3184 static void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, unsigned long exp_time)
3185 {
3186 struct ieee80211_local *local = sdata->local;
3187 struct sta_info *sta, *tmp;
3188 LIST_HEAD(tmp_list);
3189 DECLARE_MAC_BUF(mac);
3190 unsigned long flags;
3191
3192 spin_lock_irqsave(&local->sta_lock, flags);
3193 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
3194 if (time_after(jiffies, sta->last_rx + exp_time)) {
3195 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3196 printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
3197 sdata->dev->name, print_mac(mac, sta->addr));
3198 #endif
3199 __sta_info_unlink(&sta);
3200 if (sta)
3201 list_add(&sta->list, &tmp_list);
3202 }
3203 spin_unlock_irqrestore(&local->sta_lock, flags);
3204
3205 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
3206 sta_info_destroy(sta);
3207 }
3208
3209
3210 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
3211 struct ieee80211_if_sta *ifsta)
3212 {
3213 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
3214
3215 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
3216 if (ieee80211_sta_active_ibss(sdata))
3217 return;
3218
3219 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
3220 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
3221 ieee80211_sta_req_scan(sdata, ifsta->ssid, ifsta->ssid_len);
3222 }
3223
3224
3225 #ifdef CONFIG_MAC80211_MESH
3226 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
3227 struct ieee80211_if_sta *ifsta)
3228 {
3229 bool free_plinks;
3230
3231 ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
3232 mesh_path_expire(sdata);
3233
3234 free_plinks = mesh_plink_availables(sdata);
3235 if (free_plinks != sdata->u.sta.accepting_plinks)
3236 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3237
3238 mod_timer(&ifsta->timer, jiffies +
3239 IEEE80211_MESH_HOUSEKEEPING_INTERVAL);
3240 }
3241
3242
3243 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
3244 {
3245 struct ieee80211_if_sta *ifsta;
3246 ifsta = &sdata->u.sta;
3247 ifsta->state = IEEE80211_STA_MLME_MESH_UP;
3248 ieee80211_sta_timer((unsigned long)sdata);
3249 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3250 }
3251 #endif
3252
3253
3254 void ieee80211_sta_timer(unsigned long data)
3255 {
3256 struct ieee80211_sub_if_data *sdata =
3257 (struct ieee80211_sub_if_data *) data;
3258 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3259 struct ieee80211_local *local = sdata->local;
3260
3261 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3262 queue_work(local->hw.workqueue, &ifsta->work);
3263 }
3264
3265 void ieee80211_sta_work(struct work_struct *work)
3266 {
3267 struct ieee80211_sub_if_data *sdata =
3268 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
3269 struct ieee80211_local *local = sdata->local;
3270 struct ieee80211_if_sta *ifsta;
3271 struct sk_buff *skb;
3272
3273 if (!netif_running(sdata->dev))
3274 return;
3275
3276 if (local->sta_sw_scanning || local->sta_hw_scanning)
3277 return;
3278
3279 if (WARN_ON(sdata->vif.type != IEEE80211_IF_TYPE_STA &&
3280 sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
3281 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
3282 return;
3283 ifsta = &sdata->u.sta;
3284
3285 while ((skb = skb_dequeue(&ifsta->skb_queue)))
3286 ieee80211_sta_rx_queued_mgmt(sdata, skb);
3287
3288 #ifdef CONFIG_MAC80211_MESH
3289 if (ifsta->preq_queue_len &&
3290 time_after(jiffies,
3291 ifsta->last_preq + msecs_to_jiffies(ifsta->mshcfg.dot11MeshHWMPpreqMinInterval)))
3292 mesh_path_start_discovery(sdata);
3293 #endif
3294
3295 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
3296 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
3297 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
3298 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
3299 if (ifsta->scan_ssid_len)
3300 ieee80211_sta_start_scan(sdata, ifsta->scan_ssid, ifsta->scan_ssid_len);
3301 else
3302 ieee80211_sta_start_scan(sdata, NULL, 0);
3303 return;
3304 }
3305
3306 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
3307 if (ieee80211_sta_config_auth(sdata, ifsta))
3308 return;
3309 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3310 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
3311 return;
3312
3313 switch (ifsta->state) {
3314 case IEEE80211_STA_MLME_DISABLED:
3315 break;
3316 case IEEE80211_STA_MLME_DIRECT_PROBE:
3317 ieee80211_direct_probe(sdata, ifsta);
3318 break;
3319 case IEEE80211_STA_MLME_AUTHENTICATE:
3320 ieee80211_authenticate(sdata, ifsta);
3321 break;
3322 case IEEE80211_STA_MLME_ASSOCIATE:
3323 ieee80211_associate(sdata, ifsta);
3324 break;
3325 case IEEE80211_STA_MLME_ASSOCIATED:
3326 ieee80211_associated(sdata, ifsta);
3327 break;
3328 case IEEE80211_STA_MLME_IBSS_SEARCH:
3329 ieee80211_sta_find_ibss(sdata, ifsta);
3330 break;
3331 case IEEE80211_STA_MLME_IBSS_JOINED:
3332 ieee80211_sta_merge_ibss(sdata, ifsta);
3333 break;
3334 #ifdef CONFIG_MAC80211_MESH
3335 case IEEE80211_STA_MLME_MESH_UP:
3336 ieee80211_mesh_housekeeping(sdata, ifsta);
3337 break;
3338 #endif
3339 default:
3340 WARN_ON(1);
3341 break;
3342 }
3343
3344 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
3345 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
3346 "mixed-cell disabled - disassociate\n", sdata->dev->name);
3347
3348 ieee80211_send_disassoc(sdata, ifsta, WLAN_REASON_UNSPECIFIED);
3349 ieee80211_set_disassoc(sdata, ifsta, 0);
3350 }
3351 }
3352
3353
3354 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
3355 struct ieee80211_if_sta *ifsta)
3356 {
3357 struct ieee80211_local *local = sdata->local;
3358
3359 if (local->ops->reset_tsf) {
3360 /* Reset own TSF to allow time synchronization work. */
3361 local->ops->reset_tsf(local_to_hw(local));
3362 }
3363
3364 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
3365
3366
3367 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
3368 ifsta->auth_alg = WLAN_AUTH_OPEN;
3369 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
3370 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
3371 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
3372 ifsta->auth_alg = WLAN_AUTH_LEAP;
3373 else
3374 ifsta->auth_alg = WLAN_AUTH_OPEN;
3375 ifsta->auth_transaction = -1;
3376 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
3377 ifsta->assoc_scan_tries = 0;
3378 ifsta->direct_probe_tries = 0;
3379 ifsta->auth_tries = 0;
3380 ifsta->assoc_tries = 0;
3381 netif_carrier_off(sdata->dev);
3382 }
3383
3384
3385 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
3386 struct ieee80211_if_sta *ifsta)
3387 {
3388 struct ieee80211_local *local = sdata->local;
3389
3390 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3391 return;
3392
3393 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
3394 IEEE80211_STA_AUTO_BSSID_SEL)) &&
3395 (ifsta->flags & (IEEE80211_STA_SSID_SET |
3396 IEEE80211_STA_AUTO_SSID_SEL))) {
3397 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3398 queue_work(local->hw.workqueue, &ifsta->work);
3399 }
3400 }
3401
3402 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
3403 const char *ssid, int ssid_len)
3404 {
3405 int tmp, hidden_ssid;
3406
3407 if (ssid_len == ifsta->ssid_len &&
3408 !memcmp(ifsta->ssid, ssid, ssid_len))
3409 return 1;
3410
3411 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
3412 return 0;
3413
3414 hidden_ssid = 1;
3415 tmp = ssid_len;
3416 while (tmp--) {
3417 if (ssid[tmp] != '\0') {
3418 hidden_ssid = 0;
3419 break;
3420 }
3421 }
3422
3423 if (hidden_ssid && ifsta->ssid_len == ssid_len)
3424 return 1;
3425
3426 if (ssid_len == 1 && ssid[0] == ' ')
3427 return 1;
3428
3429 return 0;
3430 }
3431
3432 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
3433 struct ieee80211_if_sta *ifsta)
3434 {
3435 struct ieee80211_local *local = sdata->local;
3436 struct ieee80211_sta_bss *bss, *selected = NULL;
3437 int top_rssi = 0, freq;
3438
3439 spin_lock_bh(&local->sta_bss_lock);
3440 freq = local->oper_channel->center_freq;
3441 list_for_each_entry(bss, &local->sta_bss_list, list) {
3442 if (!(bss->capability & WLAN_CAPABILITY_ESS))
3443 continue;
3444
3445 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
3446 IEEE80211_STA_AUTO_BSSID_SEL |
3447 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
3448 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
3449 !!sdata->default_key))
3450 continue;
3451
3452 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
3453 bss->freq != freq)
3454 continue;
3455
3456 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
3457 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
3458 continue;
3459
3460 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
3461 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
3462 continue;
3463
3464 if (!selected || top_rssi < bss->signal) {
3465 selected = bss;
3466 top_rssi = bss->signal;
3467 }
3468 }
3469 if (selected)
3470 atomic_inc(&selected->users);
3471 spin_unlock_bh(&local->sta_bss_lock);
3472
3473 if (selected) {
3474 ieee80211_set_freq(sdata, selected->freq);
3475 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
3476 ieee80211_sta_set_ssid(sdata, selected->ssid,
3477 selected->ssid_len);
3478 ieee80211_sta_set_bssid(sdata, selected->bssid);
3479 ieee80211_sta_def_wmm_params(sdata, selected, 0);
3480
3481 /* Send out direct probe if no probe resp was received or
3482 * the one we have is outdated
3483 */
3484 if (!selected->last_probe_resp ||
3485 time_after(jiffies, selected->last_probe_resp
3486 + IEEE80211_SCAN_RESULT_EXPIRE))
3487 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
3488 else
3489 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
3490
3491 ieee80211_rx_bss_put(local, selected);
3492 ieee80211_sta_reset_auth(sdata, ifsta);
3493 return 0;
3494 } else {
3495 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
3496 ifsta->assoc_scan_tries++;
3497 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
3498 ieee80211_sta_start_scan(sdata, NULL, 0);
3499 else
3500 ieee80211_sta_start_scan(sdata, ifsta->ssid,
3501 ifsta->ssid_len);
3502 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
3503 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3504 } else
3505 ifsta->state = IEEE80211_STA_MLME_DISABLED;
3506 }
3507 return -1;
3508 }
3509
3510
3511 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
3512 struct ieee80211_if_sta *ifsta)
3513 {
3514 struct ieee80211_local *local = sdata->local;
3515 struct ieee80211_sta_bss *bss;
3516 struct ieee80211_supported_band *sband;
3517 u8 bssid[ETH_ALEN], *pos;
3518 int i;
3519 int ret;
3520 DECLARE_MAC_BUF(mac);
3521
3522 #if 0
3523 /* Easier testing, use fixed BSSID. */
3524 memset(bssid, 0xfe, ETH_ALEN);
3525 #else
3526 /* Generate random, not broadcast, locally administered BSSID. Mix in
3527 * own MAC address to make sure that devices that do not have proper
3528 * random number generator get different BSSID. */
3529 get_random_bytes(bssid, ETH_ALEN);
3530 for (i = 0; i < ETH_ALEN; i++)
3531 bssid[i] ^= sdata->dev->dev_addr[i];
3532 bssid[0] &= ~0x01;
3533 bssid[0] |= 0x02;
3534 #endif
3535
3536 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
3537 sdata->dev->name, print_mac(mac, bssid));
3538
3539 bss = ieee80211_rx_bss_add(sdata, bssid,
3540 local->hw.conf.channel->center_freq,
3541 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
3542 if (!bss)
3543 return -ENOMEM;
3544
3545 bss->band = local->hw.conf.channel->band;
3546 sband = local->hw.wiphy->bands[bss->band];
3547
3548 if (local->hw.conf.beacon_int == 0)
3549 local->hw.conf.beacon_int = 100;
3550 bss->beacon_int = local->hw.conf.beacon_int;
3551 bss->last_update = jiffies;
3552 bss->capability = WLAN_CAPABILITY_IBSS;
3553
3554 if (sdata->default_key)
3555 bss->capability |= WLAN_CAPABILITY_PRIVACY;
3556 else
3557 sdata->drop_unencrypted = 0;
3558
3559 bss->supp_rates_len = sband->n_bitrates;
3560 pos = bss->supp_rates;
3561 for (i = 0; i < sband->n_bitrates; i++) {
3562 int rate = sband->bitrates[i].bitrate;
3563 *pos++ = (u8) (rate / 5);
3564 }
3565
3566 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
3567 ieee80211_rx_bss_put(local, bss);
3568 return ret;
3569 }
3570
3571
3572 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
3573 struct ieee80211_if_sta *ifsta)
3574 {
3575 struct ieee80211_local *local = sdata->local;
3576 struct ieee80211_sta_bss *bss;
3577 int found = 0;
3578 u8 bssid[ETH_ALEN];
3579 int active_ibss;
3580 DECLARE_MAC_BUF(mac);
3581 DECLARE_MAC_BUF(mac2);
3582
3583 if (ifsta->ssid_len == 0)
3584 return -EINVAL;
3585
3586 active_ibss = ieee80211_sta_active_ibss(sdata);
3587 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3588 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
3589 sdata->dev->name, active_ibss);
3590 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3591 spin_lock_bh(&local->sta_bss_lock);
3592 list_for_each_entry(bss, &local->sta_bss_list, list) {
3593 if (ifsta->ssid_len != bss->ssid_len ||
3594 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
3595 || !(bss->capability & WLAN_CAPABILITY_IBSS))
3596 continue;
3597 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3598 printk(KERN_DEBUG " bssid=%s found\n",
3599 print_mac(mac, bss->bssid));
3600 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3601 memcpy(bssid, bss->bssid, ETH_ALEN);
3602 found = 1;
3603 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
3604 break;
3605 }
3606 spin_unlock_bh(&local->sta_bss_lock);
3607
3608 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3609 if (found)
3610 printk(KERN_DEBUG " sta_find_ibss: selected %s current "
3611 "%s\n", print_mac(mac, bssid),
3612 print_mac(mac2, ifsta->bssid));
3613 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3614
3615 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3616 int ret;
3617 int search_freq;
3618
3619 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
3620 search_freq = bss->freq;
3621 else
3622 search_freq = local->hw.conf.channel->center_freq;
3623
3624 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
3625 ifsta->ssid, ifsta->ssid_len);
3626 if (!bss)
3627 goto dont_join;
3628
3629 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
3630 " based on configured SSID\n",
3631 sdata->dev->name, print_mac(mac, bssid));
3632 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
3633 ieee80211_rx_bss_put(local, bss);
3634 return ret;
3635 }
3636
3637 dont_join:
3638 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3639 printk(KERN_DEBUG " did not try to join ibss\n");
3640 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3641
3642 /* Selected IBSS not found in current scan results - try to scan */
3643 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
3644 !ieee80211_sta_active_ibss(sdata)) {
3645 mod_timer(&ifsta->timer, jiffies +
3646 IEEE80211_IBSS_MERGE_INTERVAL);
3647 } else if (time_after(jiffies, local->last_scan_completed +
3648 IEEE80211_SCAN_INTERVAL)) {
3649 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
3650 "join\n", sdata->dev->name);
3651 return ieee80211_sta_req_scan(sdata, ifsta->ssid,
3652 ifsta->ssid_len);
3653 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
3654 int interval = IEEE80211_SCAN_INTERVAL;
3655
3656 if (time_after(jiffies, ifsta->ibss_join_req +
3657 IEEE80211_IBSS_JOIN_TIMEOUT)) {
3658 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
3659 (!(local->oper_channel->flags &
3660 IEEE80211_CHAN_NO_IBSS)))
3661 return ieee80211_sta_create_ibss(sdata, ifsta);
3662 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
3663 printk(KERN_DEBUG "%s: IBSS not allowed on"
3664 " %d MHz\n", sdata->dev->name,
3665 local->hw.conf.channel->center_freq);
3666 }
3667
3668 /* No IBSS found - decrease scan interval and continue
3669 * scanning. */
3670 interval = IEEE80211_SCAN_INTERVAL_SLOW;
3671 }
3672
3673 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
3674 mod_timer(&ifsta->timer, jiffies + interval);
3675 return 0;
3676 }
3677
3678 return 0;
3679 }
3680
3681
3682 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
3683 {
3684 struct ieee80211_if_sta *ifsta;
3685 int res;
3686
3687 if (len > IEEE80211_MAX_SSID_LEN)
3688 return -EINVAL;
3689
3690 ifsta = &sdata->u.sta;
3691
3692 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
3693 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
3694 memcpy(ifsta->ssid, ssid, len);
3695 ifsta->ssid_len = len;
3696 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
3697
3698 res = 0;
3699 /*
3700 * Hack! MLME code needs to be cleaned up to have different
3701 * entry points for configuration and internal selection change
3702 */
3703 if (netif_running(sdata->dev))
3704 res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
3705 if (res) {
3706 printk(KERN_DEBUG "%s: Failed to config new SSID to "
3707 "the low-level driver\n", sdata->dev->name);
3708 return res;
3709 }
3710 }
3711
3712 if (len)
3713 ifsta->flags |= IEEE80211_STA_SSID_SET;
3714 else
3715 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
3716
3717 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3718 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
3719 ifsta->ibss_join_req = jiffies;
3720 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
3721 return ieee80211_sta_find_ibss(sdata, ifsta);
3722 }
3723
3724 return 0;
3725 }
3726
3727
3728 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
3729 {
3730 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3731 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
3732 *len = ifsta->ssid_len;
3733 return 0;
3734 }
3735
3736
3737 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
3738 {
3739 struct ieee80211_if_sta *ifsta;
3740 int res;
3741
3742 ifsta = &sdata->u.sta;
3743
3744 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3745 memcpy(ifsta->bssid, bssid, ETH_ALEN);
3746 res = 0;
3747 /*
3748 * Hack! See also ieee80211_sta_set_ssid.
3749 */
3750 if (netif_running(sdata->dev))
3751 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
3752 if (res) {
3753 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
3754 "the low-level driver\n", sdata->dev->name);
3755 return res;
3756 }
3757 }
3758
3759 if (is_valid_ether_addr(bssid))
3760 ifsta->flags |= IEEE80211_STA_BSSID_SET;
3761 else
3762 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
3763
3764 return 0;
3765 }
3766
3767
3768 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
3769 struct ieee80211_sub_if_data *sdata,
3770 int powersave)
3771 {
3772 struct sk_buff *skb;
3773 struct ieee80211_hdr *nullfunc;
3774 __le16 fc;
3775
3776 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
3777 if (!skb) {
3778 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
3779 "frame\n", sdata->dev->name);
3780 return;
3781 }
3782 skb_reserve(skb, local->hw.extra_tx_headroom);
3783
3784 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
3785 memset(nullfunc, 0, 24);
3786 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
3787 IEEE80211_FCTL_TODS);
3788 if (powersave)
3789 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
3790 nullfunc->frame_control = fc;
3791 memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
3792 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
3793 memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
3794
3795 ieee80211_sta_tx(sdata, skb, 0);
3796 }
3797
3798
3799 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3800 {
3801 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
3802 ieee80211_vif_is_mesh(&sdata->vif))
3803 ieee80211_sta_timer((unsigned long)sdata);
3804 }
3805
3806 void ieee80211_scan_completed(struct ieee80211_hw *hw)
3807 {
3808 struct ieee80211_local *local = hw_to_local(hw);
3809 struct net_device *dev = local->scan_dev;
3810 struct ieee80211_sub_if_data *sdata;
3811 union iwreq_data wrqu;
3812
3813 local->last_scan_completed = jiffies;
3814 memset(&wrqu, 0, sizeof(wrqu));
3815 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
3816
3817 if (local->sta_hw_scanning) {
3818 local->sta_hw_scanning = 0;
3819 if (ieee80211_hw_config(local))
3820 printk(KERN_DEBUG "%s: failed to restore operational "
3821 "channel after scan\n", dev->name);
3822 /* Restart STA timer for HW scan case */
3823 rcu_read_lock();
3824 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3825 ieee80211_restart_sta_timer(sdata);
3826 rcu_read_unlock();
3827
3828 goto done;
3829 }
3830
3831 local->sta_sw_scanning = 0;
3832 if (ieee80211_hw_config(local))
3833 printk(KERN_DEBUG "%s: failed to restore operational "
3834 "channel after scan\n", dev->name);
3835
3836
3837 netif_tx_lock_bh(local->mdev);
3838 netif_addr_lock(local->mdev);
3839 local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
3840 local->ops->configure_filter(local_to_hw(local),
3841 FIF_BCN_PRBRESP_PROMISC,
3842 &local->filter_flags,
3843 local->mdev->mc_count,
3844 local->mdev->mc_list);
3845
3846 netif_addr_unlock(local->mdev);
3847 netif_tx_unlock_bh(local->mdev);
3848
3849 rcu_read_lock();
3850 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3851 /* Tell AP we're back */
3852 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
3853 sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED)
3854 ieee80211_send_nullfunc(local, sdata, 0);
3855
3856 ieee80211_restart_sta_timer(sdata);
3857
3858 netif_wake_queue(sdata->dev);
3859 }
3860 rcu_read_unlock();
3861
3862 done:
3863 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3864 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
3865 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3866 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
3867 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
3868 !ieee80211_sta_active_ibss(sdata)))
3869 ieee80211_sta_find_ibss(sdata, ifsta);
3870 }
3871 }
3872 EXPORT_SYMBOL(ieee80211_scan_completed);
3873
3874 void ieee80211_sta_scan_work(struct work_struct *work)
3875 {
3876 struct ieee80211_local *local =
3877 container_of(work, struct ieee80211_local, scan_work.work);
3878 struct net_device *dev = local->scan_dev;
3879 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3880 struct ieee80211_supported_band *sband;
3881 struct ieee80211_channel *chan;
3882 int skip;
3883 unsigned long next_delay = 0;
3884
3885 if (!local->sta_sw_scanning)
3886 return;
3887
3888 switch (local->scan_state) {
3889 case SCAN_SET_CHANNEL:
3890 /*
3891 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
3892 * after we successfully scanned the last channel of the last
3893 * band (and the last band is supported by the hw)
3894 */
3895 if (local->scan_band < IEEE80211_NUM_BANDS)
3896 sband = local->hw.wiphy->bands[local->scan_band];
3897 else
3898 sband = NULL;
3899
3900 /*
3901 * If we are at an unsupported band and have more bands
3902 * left to scan, advance to the next supported one.
3903 */
3904 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
3905 local->scan_band++;
3906 sband = local->hw.wiphy->bands[local->scan_band];
3907 local->scan_channel_idx = 0;
3908 }
3909
3910 /* if no more bands/channels left, complete scan */
3911 if (!sband || local->scan_channel_idx >= sband->n_channels) {
3912 ieee80211_scan_completed(local_to_hw(local));
3913 return;
3914 }
3915 skip = 0;
3916 chan = &sband->channels[local->scan_channel_idx];
3917
3918 if (chan->flags & IEEE80211_CHAN_DISABLED ||
3919 (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3920 chan->flags & IEEE80211_CHAN_NO_IBSS))
3921 skip = 1;
3922
3923 if (!skip) {
3924 local->scan_channel = chan;
3925 if (ieee80211_hw_config(local)) {
3926 printk(KERN_DEBUG "%s: failed to set freq to "
3927 "%d MHz for scan\n", dev->name,
3928 chan->center_freq);
3929 skip = 1;
3930 }
3931 }
3932
3933 /* advance state machine to next channel/band */
3934 local->scan_channel_idx++;
3935 if (local->scan_channel_idx >= sband->n_channels) {
3936 /*
3937 * scan_band may end up == IEEE80211_NUM_BANDS, but
3938 * we'll catch that case above and complete the scan
3939 * if that is the case.
3940 */
3941 local->scan_band++;
3942 local->scan_channel_idx = 0;
3943 }
3944
3945 if (skip)
3946 break;
3947
3948 next_delay = IEEE80211_PROBE_DELAY +
3949 usecs_to_jiffies(local->hw.channel_change_time);
3950 local->scan_state = SCAN_SEND_PROBE;
3951 break;
3952 case SCAN_SEND_PROBE:
3953 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
3954 local->scan_state = SCAN_SET_CHANNEL;
3955
3956 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
3957 break;
3958 ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
3959 local->scan_ssid_len);
3960 next_delay = IEEE80211_CHANNEL_TIME;
3961 break;
3962 }
3963
3964 if (local->sta_sw_scanning)
3965 queue_delayed_work(local->hw.workqueue, &local->scan_work,
3966 next_delay);
3967 }
3968
3969
3970 static int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata,
3971 u8 *ssid, size_t ssid_len)
3972 {
3973 struct ieee80211_local *local = scan_sdata->local;
3974 struct ieee80211_sub_if_data *sdata;
3975
3976 if (ssid_len > IEEE80211_MAX_SSID_LEN)
3977 return -EINVAL;
3978
3979 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
3980 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
3981 * BSSID: MACAddress
3982 * SSID
3983 * ScanType: ACTIVE, PASSIVE
3984 * ProbeDelay: delay (in microseconds) to be used prior to transmitting
3985 * a Probe frame during active scanning
3986 * ChannelList
3987 * MinChannelTime (>= ProbeDelay), in TU
3988 * MaxChannelTime: (>= MinChannelTime), in TU
3989 */
3990
3991 /* MLME-SCAN.confirm
3992 * BSSDescriptionSet
3993 * ResultCode: SUCCESS, INVALID_PARAMETERS
3994 */
3995
3996 if (local->sta_sw_scanning || local->sta_hw_scanning) {
3997 if (local->scan_dev == scan_sdata->dev)
3998 return 0;
3999 return -EBUSY;
4000 }
4001
4002 if (local->ops->hw_scan) {
4003 int rc = local->ops->hw_scan(local_to_hw(local),
4004 ssid, ssid_len);
4005 if (!rc) {
4006 local->sta_hw_scanning = 1;
4007 local->scan_dev = scan_sdata->dev;
4008 }
4009 return rc;
4010 }
4011
4012 local->sta_sw_scanning = 1;
4013
4014 rcu_read_lock();
4015 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4016 netif_stop_queue(sdata->dev);
4017 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
4018 (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED))
4019 ieee80211_send_nullfunc(local, sdata, 1);
4020 }
4021 rcu_read_unlock();
4022
4023 if (ssid) {
4024 local->scan_ssid_len = ssid_len;
4025 memcpy(local->scan_ssid, ssid, ssid_len);
4026 } else
4027 local->scan_ssid_len = 0;
4028 local->scan_state = SCAN_SET_CHANNEL;
4029 local->scan_channel_idx = 0;
4030 local->scan_band = IEEE80211_BAND_2GHZ;
4031 local->scan_dev = scan_sdata->dev;
4032
4033 netif_addr_lock_bh(local->mdev);
4034 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
4035 local->ops->configure_filter(local_to_hw(local),
4036 FIF_BCN_PRBRESP_PROMISC,
4037 &local->filter_flags,
4038 local->mdev->mc_count,
4039 local->mdev->mc_list);
4040 netif_addr_unlock_bh(local->mdev);
4041
4042 /* TODO: start scan as soon as all nullfunc frames are ACKed */
4043 queue_delayed_work(local->hw.workqueue, &local->scan_work,
4044 IEEE80211_CHANNEL_TIME);
4045
4046 return 0;
4047 }
4048
4049
4050 int ieee80211_sta_req_scan(struct ieee80211_sub_if_data *sdata, u8 *ssid, size_t ssid_len)
4051 {
4052 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4053 struct ieee80211_local *local = sdata->local;
4054
4055 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4056 return ieee80211_sta_start_scan(sdata, ssid, ssid_len);
4057
4058 if (local->sta_sw_scanning || local->sta_hw_scanning) {
4059 if (local->scan_dev == sdata->dev)
4060 return 0;
4061 return -EBUSY;
4062 }
4063
4064 ifsta->scan_ssid_len = ssid_len;
4065 if (ssid_len)
4066 memcpy(ifsta->scan_ssid, ssid, ssid_len);
4067 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
4068 queue_work(local->hw.workqueue, &ifsta->work);
4069 return 0;
4070 }
4071
4072
4073 static void ieee80211_sta_add_scan_ies(struct iw_request_info *info,
4074 struct ieee80211_sta_bss *bss,
4075 char **current_ev, char *end_buf)
4076 {
4077 u8 *pos, *end, *next;
4078 struct iw_event iwe;
4079
4080 if (bss == NULL || bss->ies == NULL)
4081 return;
4082
4083 /*
4084 * If needed, fragment the IEs buffer (at IE boundaries) into short
4085 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
4086 */
4087 pos = bss->ies;
4088 end = pos + bss->ies_len;
4089
4090 while (end - pos > IW_GENERIC_IE_MAX) {
4091 next = pos + 2 + pos[1];
4092 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
4093 next = next + 2 + next[1];
4094
4095 memset(&iwe, 0, sizeof(iwe));
4096 iwe.cmd = IWEVGENIE;
4097 iwe.u.data.length = next - pos;
4098 *current_ev = iwe_stream_add_point(info, *current_ev,
4099 end_buf, &iwe, pos);
4100
4101 pos = next;
4102 }
4103
4104 if (end > pos) {
4105 memset(&iwe, 0, sizeof(iwe));
4106 iwe.cmd = IWEVGENIE;
4107 iwe.u.data.length = end - pos;
4108 *current_ev = iwe_stream_add_point(info, *current_ev,
4109 end_buf, &iwe, pos);
4110 }
4111 }
4112
4113
4114 static char *
4115 ieee80211_sta_scan_result(struct ieee80211_local *local,
4116 struct iw_request_info *info,
4117 struct ieee80211_sta_bss *bss,
4118 char *current_ev, char *end_buf)
4119 {
4120 struct iw_event iwe;
4121
4122 if (time_after(jiffies,
4123 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
4124 return current_ev;
4125
4126 memset(&iwe, 0, sizeof(iwe));
4127 iwe.cmd = SIOCGIWAP;
4128 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
4129 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
4130 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4131 IW_EV_ADDR_LEN);
4132
4133 memset(&iwe, 0, sizeof(iwe));
4134 iwe.cmd = SIOCGIWESSID;
4135 if (bss_mesh_cfg(bss)) {
4136 iwe.u.data.length = bss_mesh_id_len(bss);
4137 iwe.u.data.flags = 1;
4138 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4139 &iwe, bss_mesh_id(bss));
4140 } else {
4141 iwe.u.data.length = bss->ssid_len;
4142 iwe.u.data.flags = 1;
4143 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4144 &iwe, bss->ssid);
4145 }
4146
4147 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
4148 || bss_mesh_cfg(bss)) {
4149 memset(&iwe, 0, sizeof(iwe));
4150 iwe.cmd = SIOCGIWMODE;
4151 if (bss_mesh_cfg(bss))
4152 iwe.u.mode = IW_MODE_MESH;
4153 else if (bss->capability & WLAN_CAPABILITY_ESS)
4154 iwe.u.mode = IW_MODE_MASTER;
4155 else
4156 iwe.u.mode = IW_MODE_ADHOC;
4157 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
4158 &iwe, IW_EV_UINT_LEN);
4159 }
4160
4161 memset(&iwe, 0, sizeof(iwe));
4162 iwe.cmd = SIOCGIWFREQ;
4163 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
4164 iwe.u.freq.e = 0;
4165 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4166 IW_EV_FREQ_LEN);
4167
4168 memset(&iwe, 0, sizeof(iwe));
4169 iwe.cmd = SIOCGIWFREQ;
4170 iwe.u.freq.m = bss->freq;
4171 iwe.u.freq.e = 6;
4172 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4173 IW_EV_FREQ_LEN);
4174 memset(&iwe, 0, sizeof(iwe));
4175 iwe.cmd = IWEVQUAL;
4176 iwe.u.qual.qual = bss->qual;
4177 iwe.u.qual.level = bss->signal;
4178 iwe.u.qual.noise = bss->noise;
4179 iwe.u.qual.updated = local->wstats_flags;
4180 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4181 IW_EV_QUAL_LEN);
4182
4183 memset(&iwe, 0, sizeof(iwe));
4184 iwe.cmd = SIOCGIWENCODE;
4185 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
4186 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
4187 else
4188 iwe.u.data.flags = IW_ENCODE_DISABLED;
4189 iwe.u.data.length = 0;
4190 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4191 &iwe, "");
4192
4193 ieee80211_sta_add_scan_ies(info, bss, &current_ev, end_buf);
4194
4195 if (bss && bss->supp_rates_len > 0) {
4196 /* display all supported rates in readable format */
4197 char *p = current_ev + iwe_stream_lcp_len(info);
4198 int i;
4199
4200 memset(&iwe, 0, sizeof(iwe));
4201 iwe.cmd = SIOCGIWRATE;
4202 /* Those two flags are ignored... */
4203 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
4204
4205 for (i = 0; i < bss->supp_rates_len; i++) {
4206 iwe.u.bitrate.value = ((bss->supp_rates[i] &
4207 0x7f) * 500000);
4208 p = iwe_stream_add_value(info, current_ev, p,
4209 end_buf, &iwe, IW_EV_PARAM_LEN);
4210 }
4211 current_ev = p;
4212 }
4213
4214 if (bss) {
4215 char *buf;
4216 buf = kmalloc(30, GFP_ATOMIC);
4217 if (buf) {
4218 memset(&iwe, 0, sizeof(iwe));
4219 iwe.cmd = IWEVCUSTOM;
4220 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
4221 iwe.u.data.length = strlen(buf);
4222 current_ev = iwe_stream_add_point(info, current_ev,
4223 end_buf,
4224 &iwe, buf);
4225 memset(&iwe, 0, sizeof(iwe));
4226 iwe.cmd = IWEVCUSTOM;
4227 sprintf(buf, " Last beacon: %dms ago",
4228 jiffies_to_msecs(jiffies - bss->last_update));
4229 iwe.u.data.length = strlen(buf);
4230 current_ev = iwe_stream_add_point(info, current_ev,
4231 end_buf, &iwe, buf);
4232 kfree(buf);
4233 }
4234 }
4235
4236 if (bss_mesh_cfg(bss)) {
4237 char *buf;
4238 u8 *cfg = bss_mesh_cfg(bss);
4239 buf = kmalloc(50, GFP_ATOMIC);
4240 if (buf) {
4241 memset(&iwe, 0, sizeof(iwe));
4242 iwe.cmd = IWEVCUSTOM;
4243 sprintf(buf, "Mesh network (version %d)", cfg[0]);
4244 iwe.u.data.length = strlen(buf);
4245 current_ev = iwe_stream_add_point(info, current_ev,
4246 end_buf,
4247 &iwe, buf);
4248 sprintf(buf, "Path Selection Protocol ID: "
4249 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
4250 cfg[4]);
4251 iwe.u.data.length = strlen(buf);
4252 current_ev = iwe_stream_add_point(info, current_ev,
4253 end_buf,
4254 &iwe, buf);
4255 sprintf(buf, "Path Selection Metric ID: "
4256 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
4257 cfg[8]);
4258 iwe.u.data.length = strlen(buf);
4259 current_ev = iwe_stream_add_point(info, current_ev,
4260 end_buf,
4261 &iwe, buf);
4262 sprintf(buf, "Congestion Control Mode ID: "
4263 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
4264 cfg[11], cfg[12]);
4265 iwe.u.data.length = strlen(buf);
4266 current_ev = iwe_stream_add_point(info, current_ev,
4267 end_buf,
4268 &iwe, buf);
4269 sprintf(buf, "Channel Precedence: "
4270 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
4271 cfg[15], cfg[16]);
4272 iwe.u.data.length = strlen(buf);
4273 current_ev = iwe_stream_add_point(info, current_ev,
4274 end_buf,
4275 &iwe, buf);
4276 kfree(buf);
4277 }
4278 }
4279
4280 return current_ev;
4281 }
4282
4283
4284 int ieee80211_sta_scan_results(struct ieee80211_local *local,
4285 struct iw_request_info *info,
4286 char *buf, size_t len)
4287 {
4288 char *current_ev = buf;
4289 char *end_buf = buf + len;
4290 struct ieee80211_sta_bss *bss;
4291
4292 spin_lock_bh(&local->sta_bss_lock);
4293 list_for_each_entry(bss, &local->sta_bss_list, list) {
4294 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
4295 spin_unlock_bh(&local->sta_bss_lock);
4296 return -E2BIG;
4297 }
4298 current_ev = ieee80211_sta_scan_result(local, info, bss,
4299 current_ev, end_buf);
4300 }
4301 spin_unlock_bh(&local->sta_bss_lock);
4302 return current_ev - buf;
4303 }
4304
4305
4306 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
4307 {
4308 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4309
4310 kfree(ifsta->extra_ie);
4311 if (len == 0) {
4312 ifsta->extra_ie = NULL;
4313 ifsta->extra_ie_len = 0;
4314 return 0;
4315 }
4316 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
4317 if (!ifsta->extra_ie) {
4318 ifsta->extra_ie_len = 0;
4319 return -ENOMEM;
4320 }
4321 memcpy(ifsta->extra_ie, ie, len);
4322 ifsta->extra_ie_len = len;
4323 return 0;
4324 }
4325
4326
4327 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
4328 struct sk_buff *skb, u8 *bssid,
4329 u8 *addr, u64 supp_rates)
4330 {
4331 struct ieee80211_local *local = sdata->local;
4332 struct sta_info *sta;
4333 DECLARE_MAC_BUF(mac);
4334 int band = local->hw.conf.channel->band;
4335
4336 /* TODO: Could consider removing the least recently used entry and
4337 * allow new one to be added. */
4338 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
4339 if (net_ratelimit()) {
4340 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
4341 "entry %s\n", sdata->dev->name, print_mac(mac, addr));
4342 }
4343 return NULL;
4344 }
4345
4346 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
4347 return NULL;
4348
4349 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
4350 printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
4351 wiphy_name(local->hw.wiphy), print_mac(mac, addr), sdata->dev->name);
4352 #endif
4353
4354 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
4355 if (!sta)
4356 return NULL;
4357
4358 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
4359
4360 /* make sure mandatory rates are always added */
4361 sta->supp_rates[band] = supp_rates |
4362 ieee80211_sta_get_mandatory_rates(local, band);
4363
4364 rate_control_rate_init(sta, local);
4365
4366 if (sta_info_insert(sta))
4367 return NULL;
4368
4369 return sta;
4370 }
4371
4372
4373 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
4374 {
4375 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4376
4377 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
4378 sdata->dev->name, reason);
4379
4380 if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
4381 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
4382 return -EINVAL;
4383
4384 ieee80211_send_deauth(sdata, ifsta, reason);
4385 ieee80211_set_disassoc(sdata, ifsta, 1);
4386 return 0;
4387 }
4388
4389
4390 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
4391 {
4392 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4393
4394 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
4395 sdata->dev->name, reason);
4396
4397 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4398 return -EINVAL;
4399
4400 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
4401 return -1;
4402
4403 ieee80211_send_disassoc(sdata, ifsta, reason);
4404 ieee80211_set_disassoc(sdata, ifsta, 0);
4405 return 0;
4406 }
4407
4408 void ieee80211_notify_mac(struct ieee80211_hw *hw,
4409 enum ieee80211_notification_types notif_type)
4410 {
4411 struct ieee80211_local *local = hw_to_local(hw);
4412 struct ieee80211_sub_if_data *sdata;
4413
4414 switch (notif_type) {
4415 case IEEE80211_NOTIFY_RE_ASSOC:
4416 rcu_read_lock();
4417 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4418 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4419 continue;
4420
4421 ieee80211_sta_req_auth(sdata, &sdata->u.sta);
4422 }
4423 rcu_read_unlock();
4424 break;
4425 }
4426 }
4427 EXPORT_SYMBOL(ieee80211_notify_mac);
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