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replace net_device arguments with ieee80211_{local,sub_if_data} as appropriate
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 /* TODO:
15 * order BSS list by RSSI(?) ("quality of AP")
16 * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
17 * SSID)
18 */
19 #include <linux/delay.h>
20 #include <linux/if_ether.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
23 #include <linux/if_arp.h>
24 #include <linux/wireless.h>
25 #include <linux/random.h>
26 #include <linux/etherdevice.h>
27 #include <linux/rtnetlink.h>
28 #include <net/iw_handler.h>
29 #include <asm/types.h>
30
31 #include <net/mac80211.h>
32 #include "ieee80211_i.h"
33 #include "rate.h"
34 #include "led.h"
35 #include "mesh.h"
36
37 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
38 #define IEEE80211_AUTH_MAX_TRIES 3
39 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
40 #define IEEE80211_ASSOC_MAX_TRIES 3
41 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
42 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
43 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
44 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
45 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
46 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
47 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
48
49 #define IEEE80211_PROBE_DELAY (HZ / 33)
50 #define IEEE80211_CHANNEL_TIME (HZ / 33)
51 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
52 #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
53 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
54 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
55 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
56
57 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
58
59
60 #define ERP_INFO_USE_PROTECTION BIT(1)
61
62 /* mgmt header + 1 byte action code */
63 #define IEEE80211_MIN_ACTION_SIZE (24 + 1)
64
65 #define IEEE80211_ADDBA_PARAM_POLICY_MASK 0x0002
66 #define IEEE80211_ADDBA_PARAM_TID_MASK 0x003C
67 #define IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK 0xFFA0
68 #define IEEE80211_DELBA_PARAM_TID_MASK 0xF000
69 #define IEEE80211_DELBA_PARAM_INITIATOR_MASK 0x0800
70
71 /* next values represent the buffer size for A-MPDU frame.
72 * According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2) */
73 #define IEEE80211_MIN_AMPDU_BUF 0x8
74 #define IEEE80211_MAX_AMPDU_BUF 0x40
75
76 static void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
77 u8 *ssid, size_t ssid_len);
78 static struct ieee80211_sta_bss *
79 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
80 u8 *ssid, u8 ssid_len);
81 static void ieee80211_rx_bss_put(struct ieee80211_local *local,
82 struct ieee80211_sta_bss *bss);
83 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
84 struct ieee80211_if_sta *ifsta);
85 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata);
86 static int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *sdata,
87 u8 *ssid, size_t ssid_len);
88 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
89 struct ieee80211_if_sta *ifsta);
90 static void sta_rx_agg_session_timer_expired(unsigned long data);
91
92
93 void ieee802_11_parse_elems(u8 *start, size_t len,
94 struct ieee802_11_elems *elems)
95 {
96 size_t left = len;
97 u8 *pos = start;
98
99 memset(elems, 0, sizeof(*elems));
100
101 while (left >= 2) {
102 u8 id, elen;
103
104 id = *pos++;
105 elen = *pos++;
106 left -= 2;
107
108 if (elen > left)
109 return;
110
111 switch (id) {
112 case WLAN_EID_SSID:
113 elems->ssid = pos;
114 elems->ssid_len = elen;
115 break;
116 case WLAN_EID_SUPP_RATES:
117 elems->supp_rates = pos;
118 elems->supp_rates_len = elen;
119 break;
120 case WLAN_EID_FH_PARAMS:
121 elems->fh_params = pos;
122 elems->fh_params_len = elen;
123 break;
124 case WLAN_EID_DS_PARAMS:
125 elems->ds_params = pos;
126 elems->ds_params_len = elen;
127 break;
128 case WLAN_EID_CF_PARAMS:
129 elems->cf_params = pos;
130 elems->cf_params_len = elen;
131 break;
132 case WLAN_EID_TIM:
133 elems->tim = pos;
134 elems->tim_len = elen;
135 break;
136 case WLAN_EID_IBSS_PARAMS:
137 elems->ibss_params = pos;
138 elems->ibss_params_len = elen;
139 break;
140 case WLAN_EID_CHALLENGE:
141 elems->challenge = pos;
142 elems->challenge_len = elen;
143 break;
144 case WLAN_EID_WPA:
145 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
146 pos[2] == 0xf2) {
147 /* Microsoft OUI (00:50:F2) */
148 if (pos[3] == 1) {
149 /* OUI Type 1 - WPA IE */
150 elems->wpa = pos;
151 elems->wpa_len = elen;
152 } else if (elen >= 5 && pos[3] == 2) {
153 if (pos[4] == 0) {
154 elems->wmm_info = pos;
155 elems->wmm_info_len = elen;
156 } else if (pos[4] == 1) {
157 elems->wmm_param = pos;
158 elems->wmm_param_len = elen;
159 }
160 }
161 }
162 break;
163 case WLAN_EID_RSN:
164 elems->rsn = pos;
165 elems->rsn_len = elen;
166 break;
167 case WLAN_EID_ERP_INFO:
168 elems->erp_info = pos;
169 elems->erp_info_len = elen;
170 break;
171 case WLAN_EID_EXT_SUPP_RATES:
172 elems->ext_supp_rates = pos;
173 elems->ext_supp_rates_len = elen;
174 break;
175 case WLAN_EID_HT_CAPABILITY:
176 elems->ht_cap_elem = pos;
177 elems->ht_cap_elem_len = elen;
178 break;
179 case WLAN_EID_HT_EXTRA_INFO:
180 elems->ht_info_elem = pos;
181 elems->ht_info_elem_len = elen;
182 break;
183 case WLAN_EID_MESH_ID:
184 elems->mesh_id = pos;
185 elems->mesh_id_len = elen;
186 break;
187 case WLAN_EID_MESH_CONFIG:
188 elems->mesh_config = pos;
189 elems->mesh_config_len = elen;
190 break;
191 case WLAN_EID_PEER_LINK:
192 elems->peer_link = pos;
193 elems->peer_link_len = elen;
194 break;
195 case WLAN_EID_PREQ:
196 elems->preq = pos;
197 elems->preq_len = elen;
198 break;
199 case WLAN_EID_PREP:
200 elems->prep = pos;
201 elems->prep_len = elen;
202 break;
203 case WLAN_EID_PERR:
204 elems->perr = pos;
205 elems->perr_len = elen;
206 break;
207 case WLAN_EID_CHANNEL_SWITCH:
208 elems->ch_switch_elem = pos;
209 elems->ch_switch_elem_len = elen;
210 break;
211 case WLAN_EID_QUIET:
212 if (!elems->quiet_elem) {
213 elems->quiet_elem = pos;
214 elems->quiet_elem_len = elen;
215 }
216 elems->num_of_quiet_elem++;
217 break;
218 case WLAN_EID_COUNTRY:
219 elems->country_elem = pos;
220 elems->country_elem_len = elen;
221 break;
222 case WLAN_EID_PWR_CONSTRAINT:
223 elems->pwr_constr_elem = pos;
224 elems->pwr_constr_elem_len = elen;
225 break;
226 default:
227 break;
228 }
229
230 left -= elen;
231 pos += elen;
232 }
233 }
234
235
236 static int ecw2cw(int ecw)
237 {
238 return (1 << ecw) - 1;
239 }
240
241
242 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
243 struct ieee80211_sta_bss *bss,
244 int ibss)
245 {
246 struct ieee80211_local *local = sdata->local;
247 int i, have_higher_than_11mbit = 0;
248
249
250 /* cf. IEEE 802.11 9.2.12 */
251 for (i = 0; i < bss->supp_rates_len; i++)
252 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
253 have_higher_than_11mbit = 1;
254
255 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
256 have_higher_than_11mbit)
257 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
258 else
259 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
260
261
262 if (local->ops->conf_tx) {
263 struct ieee80211_tx_queue_params qparam;
264
265 memset(&qparam, 0, sizeof(qparam));
266
267 qparam.aifs = 2;
268
269 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
270 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
271 qparam.cw_min = 31;
272 else
273 qparam.cw_min = 15;
274
275 qparam.cw_max = 1023;
276 qparam.txop = 0;
277
278 for (i = 0; i < local_to_hw(local)->queues; i++)
279 local->ops->conf_tx(local_to_hw(local), i, &qparam);
280 }
281 }
282
283 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
284 struct ieee80211_if_sta *ifsta,
285 u8 *wmm_param, size_t wmm_param_len)
286 {
287 struct ieee80211_tx_queue_params params;
288 size_t left;
289 int count;
290 u8 *pos;
291
292 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
293 return;
294
295 if (!wmm_param)
296 return;
297
298 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
299 return;
300 count = wmm_param[6] & 0x0f;
301 if (count == ifsta->wmm_last_param_set)
302 return;
303 ifsta->wmm_last_param_set = count;
304
305 pos = wmm_param + 8;
306 left = wmm_param_len - 8;
307
308 memset(&params, 0, sizeof(params));
309
310 if (!local->ops->conf_tx)
311 return;
312
313 local->wmm_acm = 0;
314 for (; left >= 4; left -= 4, pos += 4) {
315 int aci = (pos[0] >> 5) & 0x03;
316 int acm = (pos[0] >> 4) & 0x01;
317 int queue;
318
319 switch (aci) {
320 case 1:
321 queue = 3;
322 if (acm)
323 local->wmm_acm |= BIT(0) | BIT(3);
324 break;
325 case 2:
326 queue = 1;
327 if (acm)
328 local->wmm_acm |= BIT(4) | BIT(5);
329 break;
330 case 3:
331 queue = 0;
332 if (acm)
333 local->wmm_acm |= BIT(6) | BIT(7);
334 break;
335 case 0:
336 default:
337 queue = 2;
338 if (acm)
339 local->wmm_acm |= BIT(1) | BIT(2);
340 break;
341 }
342
343 params.aifs = pos[0] & 0x0f;
344 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
345 params.cw_min = ecw2cw(pos[1] & 0x0f);
346 params.txop = get_unaligned_le16(pos + 2);
347 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
348 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
349 "cWmin=%d cWmax=%d txop=%d\n",
350 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
351 params.cw_max, params.txop);
352 #endif
353 /* TODO: handle ACM (block TX, fallback to next lowest allowed
354 * AC for now) */
355 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
356 printk(KERN_DEBUG "%s: failed to set TX queue "
357 "parameters for queue %d\n", local->mdev->name, queue);
358 }
359 }
360 }
361
362 static u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
363 bool use_protection,
364 bool use_short_preamble)
365 {
366 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
367 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
368 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
369 DECLARE_MAC_BUF(mac);
370 #endif
371 u32 changed = 0;
372
373 if (use_protection != bss_conf->use_cts_prot) {
374 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
375 if (net_ratelimit()) {
376 printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
377 "%s)\n",
378 sdata->dev->name,
379 use_protection ? "enabled" : "disabled",
380 print_mac(mac, ifsta->bssid));
381 }
382 #endif
383 bss_conf->use_cts_prot = use_protection;
384 changed |= BSS_CHANGED_ERP_CTS_PROT;
385 }
386
387 if (use_short_preamble != bss_conf->use_short_preamble) {
388 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
389 if (net_ratelimit()) {
390 printk(KERN_DEBUG "%s: switched to %s barker preamble"
391 " (BSSID=%s)\n",
392 sdata->dev->name,
393 use_short_preamble ? "short" : "long",
394 print_mac(mac, ifsta->bssid));
395 }
396 #endif
397 bss_conf->use_short_preamble = use_short_preamble;
398 changed |= BSS_CHANGED_ERP_PREAMBLE;
399 }
400
401 return changed;
402 }
403
404 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
405 u8 erp_value)
406 {
407 bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
408 bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
409
410 return ieee80211_handle_protect_preamb(sdata,
411 use_protection, use_short_preamble);
412 }
413
414 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
415 struct ieee80211_sta_bss *bss)
416 {
417 u32 changed = 0;
418
419 if (bss->has_erp_value)
420 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
421 else {
422 u16 capab = bss->capability;
423 changed |= ieee80211_handle_protect_preamb(sdata, false,
424 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
425 }
426
427 return changed;
428 }
429
430 int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
431 struct ieee80211_ht_info *ht_info)
432 {
433
434 if (ht_info == NULL)
435 return -EINVAL;
436
437 memset(ht_info, 0, sizeof(*ht_info));
438
439 if (ht_cap_ie) {
440 u8 ampdu_info = ht_cap_ie->ampdu_params_info;
441
442 ht_info->ht_supported = 1;
443 ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
444 ht_info->ampdu_factor =
445 ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
446 ht_info->ampdu_density =
447 (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
448 memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
449 } else
450 ht_info->ht_supported = 0;
451
452 return 0;
453 }
454
455 int ieee80211_ht_addt_info_ie_to_ht_bss_info(
456 struct ieee80211_ht_addt_info *ht_add_info_ie,
457 struct ieee80211_ht_bss_info *bss_info)
458 {
459 if (bss_info == NULL)
460 return -EINVAL;
461
462 memset(bss_info, 0, sizeof(*bss_info));
463
464 if (ht_add_info_ie) {
465 u16 op_mode;
466 op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);
467
468 bss_info->primary_channel = ht_add_info_ie->control_chan;
469 bss_info->bss_cap = ht_add_info_ie->ht_param;
470 bss_info->bss_op_mode = (u8)(op_mode & 0xff);
471 }
472
473 return 0;
474 }
475
476 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
477 struct ieee80211_if_sta *ifsta)
478 {
479 char *buf;
480 size_t len;
481 int i;
482 union iwreq_data wrqu;
483
484 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
485 return;
486
487 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
488 ifsta->assocresp_ies_len), GFP_KERNEL);
489 if (!buf)
490 return;
491
492 len = sprintf(buf, "ASSOCINFO(");
493 if (ifsta->assocreq_ies) {
494 len += sprintf(buf + len, "ReqIEs=");
495 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
496 len += sprintf(buf + len, "%02x",
497 ifsta->assocreq_ies[i]);
498 }
499 }
500 if (ifsta->assocresp_ies) {
501 if (ifsta->assocreq_ies)
502 len += sprintf(buf + len, " ");
503 len += sprintf(buf + len, "RespIEs=");
504 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
505 len += sprintf(buf + len, "%02x",
506 ifsta->assocresp_ies[i]);
507 }
508 }
509 len += sprintf(buf + len, ")");
510
511 if (len > IW_CUSTOM_MAX) {
512 len = sprintf(buf, "ASSOCRESPIE=");
513 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
514 len += sprintf(buf + len, "%02x",
515 ifsta->assocresp_ies[i]);
516 }
517 }
518
519 memset(&wrqu, 0, sizeof(wrqu));
520 wrqu.data.length = len;
521 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
522
523 kfree(buf);
524 }
525
526
527 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
528 struct ieee80211_if_sta *ifsta,
529 bool assoc)
530 {
531 struct ieee80211_local *local = sdata->local;
532 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
533 union iwreq_data wrqu;
534 u32 changed = BSS_CHANGED_ASSOC;
535
536 if (assoc) {
537 struct ieee80211_sta_bss *bss;
538
539 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
540
541 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
542 return;
543
544 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
545 conf->channel->center_freq,
546 ifsta->ssid, ifsta->ssid_len);
547 if (bss) {
548 /* set timing information */
549 sdata->bss_conf.beacon_int = bss->beacon_int;
550 sdata->bss_conf.timestamp = bss->timestamp;
551 sdata->bss_conf.dtim_period = bss->dtim_period;
552
553 changed |= ieee80211_handle_bss_capability(sdata, bss);
554
555 ieee80211_rx_bss_put(local, bss);
556 }
557
558 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
559 changed |= BSS_CHANGED_HT;
560 sdata->bss_conf.assoc_ht = 1;
561 sdata->bss_conf.ht_conf = &conf->ht_conf;
562 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
563 }
564
565 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
566 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
567 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
568 ieee80211_sta_send_associnfo(sdata, ifsta);
569 } else {
570 netif_carrier_off(sdata->dev);
571 ieee80211_sta_tear_down_BA_sessions(sdata, ifsta->bssid);
572 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
573 changed |= ieee80211_reset_erp_info(sdata);
574
575 sdata->bss_conf.assoc_ht = 0;
576 sdata->bss_conf.ht_conf = NULL;
577 sdata->bss_conf.ht_bss_conf = NULL;
578
579 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
580 }
581 ifsta->last_probe = jiffies;
582 ieee80211_led_assoc(local, assoc);
583
584 sdata->bss_conf.assoc = assoc;
585 ieee80211_bss_info_change_notify(sdata, changed);
586
587 if (assoc)
588 netif_carrier_on(sdata->dev);
589
590 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
591 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
592 }
593
594 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
595 struct ieee80211_if_sta *ifsta, int deauth)
596 {
597 if (deauth)
598 ifsta->auth_tries = 0;
599 ifsta->assoc_tries = 0;
600 ieee80211_set_associated(sdata, ifsta, 0);
601 }
602
603 void ieee80211_sta_tx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
604 int encrypt)
605 {
606 skb->dev = sdata->local->mdev;
607 skb_set_mac_header(skb, 0);
608 skb_set_network_header(skb, 0);
609 skb_set_transport_header(skb, 0);
610
611 skb->iif = sdata->dev->ifindex;
612 skb->do_not_encrypt = !encrypt;
613
614 dev_queue_xmit(skb);
615 }
616
617
618 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
619 struct ieee80211_if_sta *ifsta,
620 int transaction, u8 *extra, size_t extra_len,
621 int encrypt)
622 {
623 struct ieee80211_local *local = sdata->local;
624 struct sk_buff *skb;
625 struct ieee80211_mgmt *mgmt;
626
627 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
628 sizeof(*mgmt) + 6 + extra_len);
629 if (!skb) {
630 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
631 "frame\n", sdata->dev->name);
632 return;
633 }
634 skb_reserve(skb, local->hw.extra_tx_headroom);
635
636 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
637 memset(mgmt, 0, 24 + 6);
638 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
639 IEEE80211_STYPE_AUTH);
640 if (encrypt)
641 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
642 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
643 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
644 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
645 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
646 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
647 ifsta->auth_transaction = transaction + 1;
648 mgmt->u.auth.status_code = cpu_to_le16(0);
649 if (extra)
650 memcpy(skb_put(skb, extra_len), extra, extra_len);
651
652 ieee80211_sta_tx(sdata, skb, encrypt);
653 }
654
655
656 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
657 struct ieee80211_if_sta *ifsta)
658 {
659 DECLARE_MAC_BUF(mac);
660
661 ifsta->auth_tries++;
662 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
663 printk(KERN_DEBUG "%s: authentication with AP %s"
664 " timed out\n",
665 sdata->dev->name, print_mac(mac, ifsta->bssid));
666 ifsta->state = IEEE80211_DISABLED;
667 return;
668 }
669
670 ifsta->state = IEEE80211_AUTHENTICATE;
671 printk(KERN_DEBUG "%s: authenticate with AP %s\n",
672 sdata->dev->name, print_mac(mac, ifsta->bssid));
673
674 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
675
676 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
677 }
678
679 static int ieee80211_compatible_rates(struct ieee80211_sta_bss *bss,
680 struct ieee80211_supported_band *sband,
681 u64 *rates)
682 {
683 int i, j, count;
684 *rates = 0;
685 count = 0;
686 for (i = 0; i < bss->supp_rates_len; i++) {
687 int rate = (bss->supp_rates[i] & 0x7F) * 5;
688
689 for (j = 0; j < sband->n_bitrates; j++)
690 if (sband->bitrates[j].bitrate == rate) {
691 *rates |= BIT(j);
692 count++;
693 break;
694 }
695 }
696
697 return count;
698 }
699
700 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
701 struct ieee80211_if_sta *ifsta)
702 {
703 struct ieee80211_local *local = sdata->local;
704 struct sk_buff *skb;
705 struct ieee80211_mgmt *mgmt;
706 u8 *pos, *ies;
707 int i, len, count, rates_len, supp_rates_len;
708 u16 capab;
709 struct ieee80211_sta_bss *bss;
710 int wmm = 0;
711 struct ieee80211_supported_band *sband;
712 u64 rates = 0;
713
714 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
715 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
716 ifsta->ssid_len);
717 if (!skb) {
718 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
719 "frame\n", sdata->dev->name);
720 return;
721 }
722 skb_reserve(skb, local->hw.extra_tx_headroom);
723
724 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
725
726 capab = ifsta->capab;
727
728 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
729 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
730 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
731 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
732 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
733 }
734
735 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
736 local->hw.conf.channel->center_freq,
737 ifsta->ssid, ifsta->ssid_len);
738 if (bss) {
739 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
740 capab |= WLAN_CAPABILITY_PRIVACY;
741 if (bss->wmm_ie)
742 wmm = 1;
743
744 /* get all rates supported by the device and the AP as
745 * some APs don't like getting a superset of their rates
746 * in the association request (e.g. D-Link DAP 1353 in
747 * b-only mode) */
748 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
749
750 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
751 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
752 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
753
754 ieee80211_rx_bss_put(local, bss);
755 } else {
756 rates = ~0;
757 rates_len = sband->n_bitrates;
758 }
759
760 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
761 memset(mgmt, 0, 24);
762 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
763 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
764 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
765
766 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
767 skb_put(skb, 10);
768 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
769 IEEE80211_STYPE_REASSOC_REQ);
770 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
771 mgmt->u.reassoc_req.listen_interval =
772 cpu_to_le16(local->hw.conf.listen_interval);
773 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
774 ETH_ALEN);
775 } else {
776 skb_put(skb, 4);
777 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
778 IEEE80211_STYPE_ASSOC_REQ);
779 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
780 mgmt->u.reassoc_req.listen_interval =
781 cpu_to_le16(local->hw.conf.listen_interval);
782 }
783
784 /* SSID */
785 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
786 *pos++ = WLAN_EID_SSID;
787 *pos++ = ifsta->ssid_len;
788 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
789
790 /* add all rates which were marked to be used above */
791 supp_rates_len = rates_len;
792 if (supp_rates_len > 8)
793 supp_rates_len = 8;
794
795 len = sband->n_bitrates;
796 pos = skb_put(skb, supp_rates_len + 2);
797 *pos++ = WLAN_EID_SUPP_RATES;
798 *pos++ = supp_rates_len;
799
800 count = 0;
801 for (i = 0; i < sband->n_bitrates; i++) {
802 if (BIT(i) & rates) {
803 int rate = sband->bitrates[i].bitrate;
804 *pos++ = (u8) (rate / 5);
805 if (++count == 8)
806 break;
807 }
808 }
809
810 if (count == 8) {
811 pos = skb_put(skb, rates_len - count + 2);
812 *pos++ = WLAN_EID_EXT_SUPP_RATES;
813 *pos++ = rates_len - count;
814
815 for (i++; i < sband->n_bitrates; i++) {
816 if (BIT(i) & rates) {
817 int rate = sband->bitrates[i].bitrate;
818 *pos++ = (u8) (rate / 5);
819 }
820 }
821 }
822
823 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
824 /* 1. power capabilities */
825 pos = skb_put(skb, 4);
826 *pos++ = WLAN_EID_PWR_CAPABILITY;
827 *pos++ = 2;
828 *pos++ = 0; /* min tx power */
829 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
830
831 /* 2. supported channels */
832 /* TODO: get this in reg domain format */
833 pos = skb_put(skb, 2 * sband->n_channels + 2);
834 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
835 *pos++ = 2 * sband->n_channels;
836 for (i = 0; i < sband->n_channels; i++) {
837 *pos++ = ieee80211_frequency_to_channel(
838 sband->channels[i].center_freq);
839 *pos++ = 1; /* one channel in the subband*/
840 }
841 }
842
843 if (ifsta->extra_ie) {
844 pos = skb_put(skb, ifsta->extra_ie_len);
845 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
846 }
847
848 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
849 pos = skb_put(skb, 9);
850 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
851 *pos++ = 7; /* len */
852 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
853 *pos++ = 0x50;
854 *pos++ = 0xf2;
855 *pos++ = 2; /* WME */
856 *pos++ = 0; /* WME info */
857 *pos++ = 1; /* WME ver */
858 *pos++ = 0;
859 }
860
861 /* wmm support is a must to HT */
862 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
863 sband->ht_info.ht_supported && bss->ht_add_ie) {
864 struct ieee80211_ht_addt_info *ht_add_info =
865 (struct ieee80211_ht_addt_info *)bss->ht_add_ie;
866 u16 cap = sband->ht_info.cap;
867 __le16 tmp;
868 u32 flags = local->hw.conf.channel->flags;
869
870 switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
871 case IEEE80211_HT_IE_CHA_SEC_ABOVE:
872 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
873 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
874 cap &= ~IEEE80211_HT_CAP_SGI_40;
875 }
876 break;
877 case IEEE80211_HT_IE_CHA_SEC_BELOW:
878 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
879 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
880 cap &= ~IEEE80211_HT_CAP_SGI_40;
881 }
882 break;
883 }
884
885 tmp = cpu_to_le16(cap);
886 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
887 *pos++ = WLAN_EID_HT_CAPABILITY;
888 *pos++ = sizeof(struct ieee80211_ht_cap);
889 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
890 memcpy(pos, &tmp, sizeof(u16));
891 pos += sizeof(u16);
892 /* TODO: needs a define here for << 2 */
893 *pos++ = sband->ht_info.ampdu_factor |
894 (sband->ht_info.ampdu_density << 2);
895 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
896 }
897
898 kfree(ifsta->assocreq_ies);
899 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
900 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
901 if (ifsta->assocreq_ies)
902 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
903
904 ieee80211_sta_tx(sdata, skb, 0);
905 }
906
907
908 static void ieee80211_send_deauth(struct ieee80211_sub_if_data *sdata,
909 struct ieee80211_if_sta *ifsta, u16 reason)
910 {
911 struct ieee80211_local *local = sdata->local;
912 struct sk_buff *skb;
913 struct ieee80211_mgmt *mgmt;
914
915 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
916 if (!skb) {
917 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
918 "frame\n", sdata->dev->name);
919 return;
920 }
921 skb_reserve(skb, local->hw.extra_tx_headroom);
922
923 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
924 memset(mgmt, 0, 24);
925 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
926 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
927 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
928 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
929 IEEE80211_STYPE_DEAUTH);
930 skb_put(skb, 2);
931 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
932
933 ieee80211_sta_tx(sdata, skb, 0);
934 }
935
936
937 static void ieee80211_send_disassoc(struct ieee80211_sub_if_data *sdata,
938 struct ieee80211_if_sta *ifsta, u16 reason)
939 {
940 struct ieee80211_local *local = sdata->local;
941 struct sk_buff *skb;
942 struct ieee80211_mgmt *mgmt;
943
944 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
945 if (!skb) {
946 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
947 "frame\n", sdata->dev->name);
948 return;
949 }
950 skb_reserve(skb, local->hw.extra_tx_headroom);
951
952 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
953 memset(mgmt, 0, 24);
954 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
955 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
956 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
957 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
958 IEEE80211_STYPE_DISASSOC);
959 skb_put(skb, 2);
960 mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
961
962 ieee80211_sta_tx(sdata, skb, 0);
963 }
964
965
966 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
967 struct ieee80211_if_sta *ifsta)
968 {
969 struct ieee80211_local *local = sdata->local;
970 struct ieee80211_sta_bss *bss;
971 int bss_privacy;
972 int wep_privacy;
973 int privacy_invoked;
974
975 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
976 return 0;
977
978 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
979 local->hw.conf.channel->center_freq,
980 ifsta->ssid, ifsta->ssid_len);
981 if (!bss)
982 return 0;
983
984 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
985 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
986 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
987
988 ieee80211_rx_bss_put(local, bss);
989
990 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
991 return 0;
992
993 return 1;
994 }
995
996
997 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
998 struct ieee80211_if_sta *ifsta)
999 {
1000 DECLARE_MAC_BUF(mac);
1001
1002 ifsta->assoc_tries++;
1003 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1004 printk(KERN_DEBUG "%s: association with AP %s"
1005 " timed out\n",
1006 sdata->dev->name, print_mac(mac, ifsta->bssid));
1007 ifsta->state = IEEE80211_DISABLED;
1008 return;
1009 }
1010
1011 ifsta->state = IEEE80211_ASSOCIATE;
1012 printk(KERN_DEBUG "%s: associate with AP %s\n",
1013 sdata->dev->name, print_mac(mac, ifsta->bssid));
1014 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1015 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1016 "mixed-cell disabled - abort association\n", sdata->dev->name);
1017 ifsta->state = IEEE80211_DISABLED;
1018 return;
1019 }
1020
1021 ieee80211_send_assoc(sdata, ifsta);
1022
1023 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1024 }
1025
1026
1027 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1028 struct ieee80211_if_sta *ifsta)
1029 {
1030 struct ieee80211_local *local = sdata->local;
1031 struct sta_info *sta;
1032 int disassoc;
1033 DECLARE_MAC_BUF(mac);
1034
1035 /* TODO: start monitoring current AP signal quality and number of
1036 * missed beacons. Scan other channels every now and then and search
1037 * for better APs. */
1038 /* TODO: remove expired BSSes */
1039
1040 ifsta->state = IEEE80211_ASSOCIATED;
1041
1042 rcu_read_lock();
1043
1044 sta = sta_info_get(local, ifsta->bssid);
1045 if (!sta) {
1046 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
1047 sdata->dev->name, print_mac(mac, ifsta->bssid));
1048 disassoc = 1;
1049 } else {
1050 disassoc = 0;
1051 if (time_after(jiffies,
1052 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1053 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1054 printk(KERN_DEBUG "%s: No ProbeResp from "
1055 "current AP %s - assume out of "
1056 "range\n",
1057 sdata->dev->name, print_mac(mac, ifsta->bssid));
1058 disassoc = 1;
1059 sta_info_unlink(&sta);
1060 } else
1061 ieee80211_send_probe_req(sdata, ifsta->bssid,
1062 local->scan_ssid,
1063 local->scan_ssid_len);
1064 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1065 } else {
1066 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1067 if (time_after(jiffies, ifsta->last_probe +
1068 IEEE80211_PROBE_INTERVAL)) {
1069 ifsta->last_probe = jiffies;
1070 ieee80211_send_probe_req(sdata, ifsta->bssid,
1071 ifsta->ssid,
1072 ifsta->ssid_len);
1073 }
1074 }
1075 }
1076
1077 rcu_read_unlock();
1078
1079 if (disassoc && sta)
1080 sta_info_destroy(sta);
1081
1082 if (disassoc) {
1083 ifsta->state = IEEE80211_DISABLED;
1084 ieee80211_set_associated(sdata, ifsta, 0);
1085 } else {
1086 mod_timer(&ifsta->timer, jiffies +
1087 IEEE80211_MONITORING_INTERVAL);
1088 }
1089 }
1090
1091
1092 static void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1093 u8 *ssid, size_t ssid_len)
1094 {
1095 struct ieee80211_local *local = sdata->local;
1096 struct ieee80211_supported_band *sband;
1097 struct sk_buff *skb;
1098 struct ieee80211_mgmt *mgmt;
1099 u8 *pos, *supp_rates, *esupp_rates = NULL;
1100 int i;
1101
1102 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
1103 if (!skb) {
1104 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1105 "request\n", sdata->dev->name);
1106 return;
1107 }
1108 skb_reserve(skb, local->hw.extra_tx_headroom);
1109
1110 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1111 memset(mgmt, 0, 24);
1112 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1113 IEEE80211_STYPE_PROBE_REQ);
1114 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1115 if (dst) {
1116 memcpy(mgmt->da, dst, ETH_ALEN);
1117 memcpy(mgmt->bssid, dst, ETH_ALEN);
1118 } else {
1119 memset(mgmt->da, 0xff, ETH_ALEN);
1120 memset(mgmt->bssid, 0xff, ETH_ALEN);
1121 }
1122 pos = skb_put(skb, 2 + ssid_len);
1123 *pos++ = WLAN_EID_SSID;
1124 *pos++ = ssid_len;
1125 memcpy(pos, ssid, ssid_len);
1126
1127 supp_rates = skb_put(skb, 2);
1128 supp_rates[0] = WLAN_EID_SUPP_RATES;
1129 supp_rates[1] = 0;
1130 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1131
1132 for (i = 0; i < sband->n_bitrates; i++) {
1133 struct ieee80211_rate *rate = &sband->bitrates[i];
1134 if (esupp_rates) {
1135 pos = skb_put(skb, 1);
1136 esupp_rates[1]++;
1137 } else if (supp_rates[1] == 8) {
1138 esupp_rates = skb_put(skb, 3);
1139 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
1140 esupp_rates[1] = 1;
1141 pos = &esupp_rates[2];
1142 } else {
1143 pos = skb_put(skb, 1);
1144 supp_rates[1]++;
1145 }
1146 *pos = rate->bitrate / 5;
1147 }
1148
1149 ieee80211_sta_tx(sdata, skb, 0);
1150 }
1151
1152
1153 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1154 {
1155 if (!sdata || !sdata->default_key ||
1156 sdata->default_key->conf.alg != ALG_WEP)
1157 return 0;
1158 return 1;
1159 }
1160
1161
1162 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1163 struct ieee80211_if_sta *ifsta)
1164 {
1165 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1166 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1167 ieee80211_associate(sdata, ifsta);
1168 }
1169
1170
1171 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1172 struct ieee80211_if_sta *ifsta,
1173 struct ieee80211_mgmt *mgmt,
1174 size_t len)
1175 {
1176 u8 *pos;
1177 struct ieee802_11_elems elems;
1178
1179 pos = mgmt->u.auth.variable;
1180 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1181 if (!elems.challenge)
1182 return;
1183 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1184 elems.challenge_len + 2, 1);
1185 }
1186
1187 static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
1188 u8 dialog_token, u16 status, u16 policy,
1189 u16 buf_size, u16 timeout)
1190 {
1191 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1192 struct ieee80211_local *local = sdata->local;
1193 struct sk_buff *skb;
1194 struct ieee80211_mgmt *mgmt;
1195 u16 capab;
1196
1197 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1198
1199 if (!skb) {
1200 printk(KERN_DEBUG "%s: failed to allocate buffer "
1201 "for addba resp frame\n", sdata->dev->name);
1202 return;
1203 }
1204
1205 skb_reserve(skb, local->hw.extra_tx_headroom);
1206 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1207 memset(mgmt, 0, 24);
1208 memcpy(mgmt->da, da, ETH_ALEN);
1209 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1210 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1211 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1212 else
1213 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1214 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1215 IEEE80211_STYPE_ACTION);
1216
1217 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
1218 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1219 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
1220 mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
1221
1222 capab = (u16)(policy << 1); /* bit 1 aggregation policy */
1223 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1224 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
1225
1226 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
1227 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
1228 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
1229
1230 ieee80211_sta_tx(sdata, skb, 0);
1231
1232 return;
1233 }
1234
1235 void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, const u8 *da,
1236 u16 tid, u8 dialog_token, u16 start_seq_num,
1237 u16 agg_size, u16 timeout)
1238 {
1239 struct ieee80211_local *local = sdata->local;
1240 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1241 struct sk_buff *skb;
1242 struct ieee80211_mgmt *mgmt;
1243 u16 capab;
1244
1245 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1246
1247 if (!skb) {
1248 printk(KERN_ERR "%s: failed to allocate buffer "
1249 "for addba request frame\n", sdata->dev->name);
1250 return;
1251 }
1252 skb_reserve(skb, local->hw.extra_tx_headroom);
1253 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1254 memset(mgmt, 0, 24);
1255 memcpy(mgmt->da, da, ETH_ALEN);
1256 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1257 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1258 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1259 else
1260 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1261
1262 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1263 IEEE80211_STYPE_ACTION);
1264
1265 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
1266
1267 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1268 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
1269
1270 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
1271 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
1272 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1273 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
1274
1275 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
1276
1277 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
1278 mgmt->u.action.u.addba_req.start_seq_num =
1279 cpu_to_le16(start_seq_num << 4);
1280
1281 ieee80211_sta_tx(sdata, skb, 0);
1282 }
1283
1284 static void ieee80211_sta_process_addba_request(struct ieee80211_local *local,
1285 struct ieee80211_mgmt *mgmt,
1286 size_t len)
1287 {
1288 struct ieee80211_hw *hw = &local->hw;
1289 struct ieee80211_conf *conf = &hw->conf;
1290 struct sta_info *sta;
1291 struct tid_ampdu_rx *tid_agg_rx;
1292 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
1293 u8 dialog_token;
1294 int ret = -EOPNOTSUPP;
1295 DECLARE_MAC_BUF(mac);
1296
1297 rcu_read_lock();
1298
1299 sta = sta_info_get(local, mgmt->sa);
1300 if (!sta) {
1301 rcu_read_unlock();
1302 return;
1303 }
1304
1305 /* extract session parameters from addba request frame */
1306 dialog_token = mgmt->u.action.u.addba_req.dialog_token;
1307 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
1308 start_seq_num =
1309 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
1310
1311 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
1312 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
1313 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1314 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
1315
1316 status = WLAN_STATUS_REQUEST_DECLINED;
1317
1318 /* sanity check for incoming parameters:
1319 * check if configuration can support the BA policy
1320 * and if buffer size does not exceeds max value */
1321 if (((ba_policy != 1)
1322 && (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA)))
1323 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
1324 status = WLAN_STATUS_INVALID_QOS_PARAM;
1325 #ifdef CONFIG_MAC80211_HT_DEBUG
1326 if (net_ratelimit())
1327 printk(KERN_DEBUG "AddBA Req with bad params from "
1328 "%s on tid %u. policy %d, buffer size %d\n",
1329 print_mac(mac, mgmt->sa), tid, ba_policy,
1330 buf_size);
1331 #endif /* CONFIG_MAC80211_HT_DEBUG */
1332 goto end_no_lock;
1333 }
1334 /* determine default buffer size */
1335 if (buf_size == 0) {
1336 struct ieee80211_supported_band *sband;
1337
1338 sband = local->hw.wiphy->bands[conf->channel->band];
1339 buf_size = IEEE80211_MIN_AMPDU_BUF;
1340 buf_size = buf_size << sband->ht_info.ampdu_factor;
1341 }
1342
1343
1344 /* examine state machine */
1345 spin_lock_bh(&sta->lock);
1346
1347 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
1348 #ifdef CONFIG_MAC80211_HT_DEBUG
1349 if (net_ratelimit())
1350 printk(KERN_DEBUG "unexpected AddBA Req from "
1351 "%s on tid %u\n",
1352 print_mac(mac, mgmt->sa), tid);
1353 #endif /* CONFIG_MAC80211_HT_DEBUG */
1354 goto end;
1355 }
1356
1357 /* prepare A-MPDU MLME for Rx aggregation */
1358 sta->ampdu_mlme.tid_rx[tid] =
1359 kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
1360 if (!sta->ampdu_mlme.tid_rx[tid]) {
1361 #ifdef CONFIG_MAC80211_HT_DEBUG
1362 if (net_ratelimit())
1363 printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
1364 tid);
1365 #endif
1366 goto end;
1367 }
1368 /* rx timer */
1369 sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
1370 sta_rx_agg_session_timer_expired;
1371 sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
1372 (unsigned long)&sta->timer_to_tid[tid];
1373 init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1374
1375 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
1376
1377 /* prepare reordering buffer */
1378 tid_agg_rx->reorder_buf =
1379 kmalloc(buf_size * sizeof(struct sk_buff *), GFP_ATOMIC);
1380 if (!tid_agg_rx->reorder_buf) {
1381 #ifdef CONFIG_MAC80211_HT_DEBUG
1382 if (net_ratelimit())
1383 printk(KERN_ERR "can not allocate reordering buffer "
1384 "to tid %d\n", tid);
1385 #endif
1386 kfree(sta->ampdu_mlme.tid_rx[tid]);
1387 goto end;
1388 }
1389 memset(tid_agg_rx->reorder_buf, 0,
1390 buf_size * sizeof(struct sk_buff *));
1391
1392 if (local->ops->ampdu_action)
1393 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
1394 sta->addr, tid, &start_seq_num);
1395 #ifdef CONFIG_MAC80211_HT_DEBUG
1396 printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
1397 #endif /* CONFIG_MAC80211_HT_DEBUG */
1398
1399 if (ret) {
1400 kfree(tid_agg_rx->reorder_buf);
1401 kfree(tid_agg_rx);
1402 sta->ampdu_mlme.tid_rx[tid] = NULL;
1403 goto end;
1404 }
1405
1406 /* change state and send addba resp */
1407 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
1408 tid_agg_rx->dialog_token = dialog_token;
1409 tid_agg_rx->ssn = start_seq_num;
1410 tid_agg_rx->head_seq_num = start_seq_num;
1411 tid_agg_rx->buf_size = buf_size;
1412 tid_agg_rx->timeout = timeout;
1413 tid_agg_rx->stored_mpdu_num = 0;
1414 status = WLAN_STATUS_SUCCESS;
1415 end:
1416 spin_unlock_bh(&sta->lock);
1417
1418 end_no_lock:
1419 ieee80211_send_addba_resp(sta->sdata, sta->addr, tid,
1420 dialog_token, status, 1, buf_size, timeout);
1421 rcu_read_unlock();
1422 }
1423
1424 static void ieee80211_sta_process_addba_resp(struct ieee80211_local *local,
1425 struct ieee80211_mgmt *mgmt,
1426 size_t len)
1427 {
1428 struct ieee80211_hw *hw = &local->hw;
1429 struct sta_info *sta;
1430 u16 capab;
1431 u16 tid;
1432 u8 *state;
1433
1434 rcu_read_lock();
1435
1436 sta = sta_info_get(local, mgmt->sa);
1437 if (!sta) {
1438 rcu_read_unlock();
1439 return;
1440 }
1441
1442 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
1443 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1444
1445 state = &sta->ampdu_mlme.tid_state_tx[tid];
1446
1447 spin_lock_bh(&sta->lock);
1448
1449 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1450 spin_unlock_bh(&sta->lock);
1451 goto addba_resp_exit;
1452 }
1453
1454 if (mgmt->u.action.u.addba_resp.dialog_token !=
1455 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
1456 spin_unlock_bh(&sta->lock);
1457 #ifdef CONFIG_MAC80211_HT_DEBUG
1458 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
1459 #endif /* CONFIG_MAC80211_HT_DEBUG */
1460 goto addba_resp_exit;
1461 }
1462
1463 del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
1464 #ifdef CONFIG_MAC80211_HT_DEBUG
1465 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
1466 #endif /* CONFIG_MAC80211_HT_DEBUG */
1467 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
1468 == WLAN_STATUS_SUCCESS) {
1469 *state |= HT_ADDBA_RECEIVED_MSK;
1470 sta->ampdu_mlme.addba_req_num[tid] = 0;
1471
1472 if (*state == HT_AGG_STATE_OPERATIONAL)
1473 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
1474
1475 spin_unlock_bh(&sta->lock);
1476 } else {
1477 sta->ampdu_mlme.addba_req_num[tid]++;
1478 /* this will allow the state check in stop_BA_session */
1479 *state = HT_AGG_STATE_OPERATIONAL;
1480 spin_unlock_bh(&sta->lock);
1481 ieee80211_stop_tx_ba_session(hw, sta->addr, tid,
1482 WLAN_BACK_INITIATOR);
1483 }
1484
1485 addba_resp_exit:
1486 rcu_read_unlock();
1487 }
1488
1489 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, const u8 *da, u16 tid,
1490 u16 initiator, u16 reason_code)
1491 {
1492 struct ieee80211_local *local = sdata->local;
1493 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1494 struct sk_buff *skb;
1495 struct ieee80211_mgmt *mgmt;
1496 u16 params;
1497
1498 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1499
1500 if (!skb) {
1501 printk(KERN_ERR "%s: failed to allocate buffer "
1502 "for delba frame\n", sdata->dev->name);
1503 return;
1504 }
1505
1506 skb_reserve(skb, local->hw.extra_tx_headroom);
1507 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1508 memset(mgmt, 0, 24);
1509 memcpy(mgmt->da, da, ETH_ALEN);
1510 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1511 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1512 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1513 else
1514 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1515 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1516 IEEE80211_STYPE_ACTION);
1517
1518 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
1519
1520 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1521 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
1522 params = (u16)(initiator << 11); /* bit 11 initiator */
1523 params |= (u16)(tid << 12); /* bit 15:12 TID number */
1524
1525 mgmt->u.action.u.delba.params = cpu_to_le16(params);
1526 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
1527
1528 ieee80211_sta_tx(sdata, skb, 0);
1529 }
1530
1531 void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
1532 {
1533 struct ieee80211_local *local = sdata->local;
1534 struct sk_buff *skb;
1535 struct ieee80211_bar *bar;
1536 u16 bar_control = 0;
1537
1538 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
1539 if (!skb) {
1540 printk(KERN_ERR "%s: failed to allocate buffer for "
1541 "bar frame\n", sdata->dev->name);
1542 return;
1543 }
1544 skb_reserve(skb, local->hw.extra_tx_headroom);
1545 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
1546 memset(bar, 0, sizeof(*bar));
1547 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
1548 IEEE80211_STYPE_BACK_REQ);
1549 memcpy(bar->ra, ra, ETH_ALEN);
1550 memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN);
1551 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
1552 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
1553 bar_control |= (u16)(tid << 12);
1554 bar->control = cpu_to_le16(bar_control);
1555 bar->start_seq_num = cpu_to_le16(ssn);
1556
1557 ieee80211_sta_tx(sdata, skb, 0);
1558 }
1559
1560 void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
1561 u16 initiator, u16 reason)
1562 {
1563 struct ieee80211_local *local = sdata->local;
1564 struct ieee80211_hw *hw = &local->hw;
1565 struct sta_info *sta;
1566 int ret, i;
1567 DECLARE_MAC_BUF(mac);
1568
1569 rcu_read_lock();
1570
1571 sta = sta_info_get(local, ra);
1572 if (!sta) {
1573 rcu_read_unlock();
1574 return;
1575 }
1576
1577 /* check if TID is in operational state */
1578 spin_lock_bh(&sta->lock);
1579 if (sta->ampdu_mlme.tid_state_rx[tid]
1580 != HT_AGG_STATE_OPERATIONAL) {
1581 spin_unlock_bh(&sta->lock);
1582 rcu_read_unlock();
1583 return;
1584 }
1585 sta->ampdu_mlme.tid_state_rx[tid] =
1586 HT_AGG_STATE_REQ_STOP_BA_MSK |
1587 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
1588 spin_unlock_bh(&sta->lock);
1589
1590 /* stop HW Rx aggregation. ampdu_action existence
1591 * already verified in session init so we add the BUG_ON */
1592 BUG_ON(!local->ops->ampdu_action);
1593
1594 #ifdef CONFIG_MAC80211_HT_DEBUG
1595 printk(KERN_DEBUG "Rx BA session stop requested for %s tid %u\n",
1596 print_mac(mac, ra), tid);
1597 #endif /* CONFIG_MAC80211_HT_DEBUG */
1598
1599 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
1600 ra, tid, NULL);
1601 if (ret)
1602 printk(KERN_DEBUG "HW problem - can not stop rx "
1603 "aggregation for tid %d\n", tid);
1604
1605 /* shutdown timer has not expired */
1606 if (initiator != WLAN_BACK_TIMER)
1607 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1608
1609 /* check if this is a self generated aggregation halt */
1610 if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
1611 ieee80211_send_delba(sdata, ra, tid, 0, reason);
1612
1613 /* free the reordering buffer */
1614 for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
1615 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
1616 /* release the reordered frames */
1617 dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
1618 sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
1619 sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
1620 }
1621 }
1622 /* free resources */
1623 kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
1624 kfree(sta->ampdu_mlme.tid_rx[tid]);
1625 sta->ampdu_mlme.tid_rx[tid] = NULL;
1626 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
1627
1628 rcu_read_unlock();
1629 }
1630
1631
1632 static void ieee80211_sta_process_delba(struct ieee80211_sub_if_data *sdata,
1633 struct ieee80211_mgmt *mgmt, size_t len)
1634 {
1635 struct ieee80211_local *local = sdata->local;
1636 struct sta_info *sta;
1637 u16 tid, params;
1638 u16 initiator;
1639 DECLARE_MAC_BUF(mac);
1640
1641 rcu_read_lock();
1642
1643 sta = sta_info_get(local, mgmt->sa);
1644 if (!sta) {
1645 rcu_read_unlock();
1646 return;
1647 }
1648
1649 params = le16_to_cpu(mgmt->u.action.u.delba.params);
1650 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
1651 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
1652
1653 #ifdef CONFIG_MAC80211_HT_DEBUG
1654 if (net_ratelimit())
1655 printk(KERN_DEBUG "delba from %s (%s) tid %d reason code %d\n",
1656 print_mac(mac, mgmt->sa),
1657 initiator ? "initiator" : "recipient", tid,
1658 mgmt->u.action.u.delba.reason_code);
1659 #endif /* CONFIG_MAC80211_HT_DEBUG */
1660
1661 if (initiator == WLAN_BACK_INITIATOR)
1662 ieee80211_sta_stop_rx_ba_session(sdata, sta->addr, tid,
1663 WLAN_BACK_INITIATOR, 0);
1664 else { /* WLAN_BACK_RECIPIENT */
1665 spin_lock_bh(&sta->lock);
1666 sta->ampdu_mlme.tid_state_tx[tid] =
1667 HT_AGG_STATE_OPERATIONAL;
1668 spin_unlock_bh(&sta->lock);
1669 ieee80211_stop_tx_ba_session(&local->hw, sta->addr, tid,
1670 WLAN_BACK_RECIPIENT);
1671 }
1672 rcu_read_unlock();
1673 }
1674
1675 /*
1676 * After sending add Block Ack request we activated a timer until
1677 * add Block Ack response will arrive from the recipient.
1678 * If this timer expires sta_addba_resp_timer_expired will be executed.
1679 */
1680 void sta_addba_resp_timer_expired(unsigned long data)
1681 {
1682 /* not an elegant detour, but there is no choice as the timer passes
1683 * only one argument, and both sta_info and TID are needed, so init
1684 * flow in sta_info_create gives the TID as data, while the timer_to_id
1685 * array gives the sta through container_of */
1686 u16 tid = *(u8 *)data;
1687 struct sta_info *temp_sta = container_of((void *)data,
1688 struct sta_info, timer_to_tid[tid]);
1689
1690 struct ieee80211_local *local = temp_sta->local;
1691 struct ieee80211_hw *hw = &local->hw;
1692 struct sta_info *sta;
1693 u8 *state;
1694
1695 rcu_read_lock();
1696
1697 sta = sta_info_get(local, temp_sta->addr);
1698 if (!sta) {
1699 rcu_read_unlock();
1700 return;
1701 }
1702
1703 state = &sta->ampdu_mlme.tid_state_tx[tid];
1704 /* check if the TID waits for addBA response */
1705 spin_lock_bh(&sta->lock);
1706 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1707 spin_unlock_bh(&sta->lock);
1708 *state = HT_AGG_STATE_IDLE;
1709 #ifdef CONFIG_MAC80211_HT_DEBUG
1710 printk(KERN_DEBUG "timer expired on tid %d but we are not "
1711 "expecting addBA response there", tid);
1712 #endif
1713 goto timer_expired_exit;
1714 }
1715
1716 #ifdef CONFIG_MAC80211_HT_DEBUG
1717 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
1718 #endif
1719
1720 /* go through the state check in stop_BA_session */
1721 *state = HT_AGG_STATE_OPERATIONAL;
1722 spin_unlock_bh(&sta->lock);
1723 ieee80211_stop_tx_ba_session(hw, temp_sta->addr, tid,
1724 WLAN_BACK_INITIATOR);
1725
1726 timer_expired_exit:
1727 rcu_read_unlock();
1728 }
1729
1730 /*
1731 * After accepting the AddBA Request we activated a timer,
1732 * resetting it after each frame that arrives from the originator.
1733 * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
1734 */
1735 static void sta_rx_agg_session_timer_expired(unsigned long data)
1736 {
1737 /* not an elegant detour, but there is no choice as the timer passes
1738 * only one argument, and various sta_info are needed here, so init
1739 * flow in sta_info_create gives the TID as data, while the timer_to_id
1740 * array gives the sta through container_of */
1741 u8 *ptid = (u8 *)data;
1742 u8 *timer_to_id = ptid - *ptid;
1743 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
1744 timer_to_tid[0]);
1745
1746 #ifdef CONFIG_MAC80211_HT_DEBUG
1747 printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
1748 #endif
1749 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->addr,
1750 (u16)*ptid, WLAN_BACK_TIMER,
1751 WLAN_REASON_QSTA_TIMEOUT);
1752 }
1753
1754 void ieee80211_sta_tear_down_BA_sessions(struct ieee80211_sub_if_data *sdata, u8 *addr)
1755 {
1756 struct ieee80211_local *local = sdata->local;
1757 int i;
1758
1759 for (i = 0; i < STA_TID_NUM; i++) {
1760 ieee80211_stop_tx_ba_session(&local->hw, addr, i,
1761 WLAN_BACK_INITIATOR);
1762 ieee80211_sta_stop_rx_ba_session(sdata, addr, i,
1763 WLAN_BACK_RECIPIENT,
1764 WLAN_REASON_QSTA_LEAVE_QBSS);
1765 }
1766 }
1767
1768 static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
1769 struct ieee80211_msrment_ie *request_ie,
1770 const u8 *da, const u8 *bssid,
1771 u8 dialog_token)
1772 {
1773 struct ieee80211_local *local = sdata->local;
1774 struct sk_buff *skb;
1775 struct ieee80211_mgmt *msr_report;
1776
1777 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
1778 sizeof(struct ieee80211_msrment_ie));
1779
1780 if (!skb) {
1781 printk(KERN_ERR "%s: failed to allocate buffer for "
1782 "measurement report frame\n", sdata->dev->name);
1783 return;
1784 }
1785
1786 skb_reserve(skb, local->hw.extra_tx_headroom);
1787 msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
1788 memset(msr_report, 0, 24);
1789 memcpy(msr_report->da, da, ETH_ALEN);
1790 memcpy(msr_report->sa, sdata->dev->dev_addr, ETH_ALEN);
1791 memcpy(msr_report->bssid, bssid, ETH_ALEN);
1792 msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1793 IEEE80211_STYPE_ACTION);
1794
1795 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
1796 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
1797 msr_report->u.action.u.measurement.action_code =
1798 WLAN_ACTION_SPCT_MSR_RPRT;
1799 msr_report->u.action.u.measurement.dialog_token = dialog_token;
1800
1801 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
1802 msr_report->u.action.u.measurement.length =
1803 sizeof(struct ieee80211_msrment_ie);
1804
1805 memset(&msr_report->u.action.u.measurement.msr_elem, 0,
1806 sizeof(struct ieee80211_msrment_ie));
1807 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
1808 msr_report->u.action.u.measurement.msr_elem.mode |=
1809 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
1810 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
1811
1812 ieee80211_sta_tx(sdata, skb, 0);
1813 }
1814
1815 static void ieee80211_sta_process_measurement_req(struct ieee80211_sub_if_data *sdata,
1816 struct ieee80211_mgmt *mgmt,
1817 size_t len)
1818 {
1819 /*
1820 * Ignoring measurement request is spec violation.
1821 * Mandatory measurements must be reported optional
1822 * measurements might be refused or reported incapable
1823 * For now just refuse
1824 * TODO: Answer basic measurement as unmeasured
1825 */
1826 ieee80211_send_refuse_measurement_request(sdata,
1827 &mgmt->u.action.u.measurement.msr_elem,
1828 mgmt->sa, mgmt->bssid,
1829 mgmt->u.action.u.measurement.dialog_token);
1830 }
1831
1832
1833 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1834 struct ieee80211_if_sta *ifsta,
1835 struct ieee80211_mgmt *mgmt,
1836 size_t len)
1837 {
1838 u16 auth_alg, auth_transaction, status_code;
1839 DECLARE_MAC_BUF(mac);
1840
1841 if (ifsta->state != IEEE80211_AUTHENTICATE &&
1842 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1843 return;
1844
1845 if (len < 24 + 6)
1846 return;
1847
1848 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1849 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1850 return;
1851
1852 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1853 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1854 return;
1855
1856 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1857 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1858 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1859
1860 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1861 /*
1862 * IEEE 802.11 standard does not require authentication in IBSS
1863 * networks and most implementations do not seem to use it.
1864 * However, try to reply to authentication attempts if someone
1865 * has actually implemented this.
1866 */
1867 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1868 return;
1869 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1870 }
1871
1872 if (auth_alg != ifsta->auth_alg ||
1873 auth_transaction != ifsta->auth_transaction)
1874 return;
1875
1876 if (status_code != WLAN_STATUS_SUCCESS) {
1877 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1878 u8 algs[3];
1879 const int num_algs = ARRAY_SIZE(algs);
1880 int i, pos;
1881 algs[0] = algs[1] = algs[2] = 0xff;
1882 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1883 algs[0] = WLAN_AUTH_OPEN;
1884 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1885 algs[1] = WLAN_AUTH_SHARED_KEY;
1886 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1887 algs[2] = WLAN_AUTH_LEAP;
1888 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1889 pos = 0;
1890 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1891 pos = 1;
1892 else
1893 pos = 2;
1894 for (i = 0; i < num_algs; i++) {
1895 pos++;
1896 if (pos >= num_algs)
1897 pos = 0;
1898 if (algs[pos] == ifsta->auth_alg ||
1899 algs[pos] == 0xff)
1900 continue;
1901 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1902 !ieee80211_sta_wep_configured(sdata))
1903 continue;
1904 ifsta->auth_alg = algs[pos];
1905 break;
1906 }
1907 }
1908 return;
1909 }
1910
1911 switch (ifsta->auth_alg) {
1912 case WLAN_AUTH_OPEN:
1913 case WLAN_AUTH_LEAP:
1914 ieee80211_auth_completed(sdata, ifsta);
1915 break;
1916 case WLAN_AUTH_SHARED_KEY:
1917 if (ifsta->auth_transaction == 4)
1918 ieee80211_auth_completed(sdata, ifsta);
1919 else
1920 ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1921 break;
1922 }
1923 }
1924
1925
1926 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1927 struct ieee80211_if_sta *ifsta,
1928 struct ieee80211_mgmt *mgmt,
1929 size_t len)
1930 {
1931 u16 reason_code;
1932 DECLARE_MAC_BUF(mac);
1933
1934 if (len < 24 + 2)
1935 return;
1936
1937 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1938 return;
1939
1940 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1941
1942 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1943 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
1944
1945 if (ifsta->state == IEEE80211_AUTHENTICATE ||
1946 ifsta->state == IEEE80211_ASSOCIATE ||
1947 ifsta->state == IEEE80211_ASSOCIATED) {
1948 ifsta->state = IEEE80211_AUTHENTICATE;
1949 mod_timer(&ifsta->timer, jiffies +
1950 IEEE80211_RETRY_AUTH_INTERVAL);
1951 }
1952
1953 ieee80211_set_disassoc(sdata, ifsta, 1);
1954 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1955 }
1956
1957
1958 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1959 struct ieee80211_if_sta *ifsta,
1960 struct ieee80211_mgmt *mgmt,
1961 size_t len)
1962 {
1963 u16 reason_code;
1964 DECLARE_MAC_BUF(mac);
1965
1966 if (len < 24 + 2)
1967 return;
1968
1969 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1970 return;
1971
1972 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1973
1974 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1975 printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name);
1976
1977 if (ifsta->state == IEEE80211_ASSOCIATED) {
1978 ifsta->state = IEEE80211_ASSOCIATE;
1979 mod_timer(&ifsta->timer, jiffies +
1980 IEEE80211_RETRY_AUTH_INTERVAL);
1981 }
1982
1983 ieee80211_set_disassoc(sdata, ifsta, 0);
1984 }
1985
1986
1987 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1988 struct ieee80211_if_sta *ifsta,
1989 struct ieee80211_mgmt *mgmt,
1990 size_t len,
1991 int reassoc)
1992 {
1993 struct ieee80211_local *local = sdata->local;
1994 struct ieee80211_supported_band *sband;
1995 struct sta_info *sta;
1996 u64 rates, basic_rates;
1997 u16 capab_info, status_code, aid;
1998 struct ieee802_11_elems elems;
1999 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
2000 u8 *pos;
2001 int i, j;
2002 DECLARE_MAC_BUF(mac);
2003 bool have_higher_than_11mbit = false;
2004
2005 /* AssocResp and ReassocResp have identical structure, so process both
2006 * of them in this function. */
2007
2008 if (ifsta->state != IEEE80211_ASSOCIATE)
2009 return;
2010
2011 if (len < 24 + 6)
2012 return;
2013
2014 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
2015 return;
2016
2017 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2018 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2019 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2020
2021 printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
2022 "status=%d aid=%d)\n",
2023 sdata->dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
2024 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2025
2026 if (status_code != WLAN_STATUS_SUCCESS) {
2027 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
2028 sdata->dev->name, status_code);
2029 /* if this was a reassociation, ensure we try a "full"
2030 * association next time. This works around some broken APs
2031 * which do not correctly reject reassociation requests. */
2032 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2033 return;
2034 }
2035
2036 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2037 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
2038 "set\n", sdata->dev->name, aid);
2039 aid &= ~(BIT(15) | BIT(14));
2040
2041 pos = mgmt->u.assoc_resp.variable;
2042 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2043
2044 if (!elems.supp_rates) {
2045 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2046 sdata->dev->name);
2047 return;
2048 }
2049
2050 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
2051 ifsta->aid = aid;
2052 ifsta->ap_capab = capab_info;
2053
2054 kfree(ifsta->assocresp_ies);
2055 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
2056 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
2057 if (ifsta->assocresp_ies)
2058 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
2059
2060 rcu_read_lock();
2061
2062 /* Add STA entry for the AP */
2063 sta = sta_info_get(local, ifsta->bssid);
2064 if (!sta) {
2065 struct ieee80211_sta_bss *bss;
2066 int err;
2067
2068 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
2069 if (!sta) {
2070 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
2071 " the AP\n", sdata->dev->name);
2072 rcu_read_unlock();
2073 return;
2074 }
2075 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
2076 local->hw.conf.channel->center_freq,
2077 ifsta->ssid, ifsta->ssid_len);
2078 if (bss) {
2079 sta->last_signal = bss->signal;
2080 sta->last_qual = bss->qual;
2081 sta->last_noise = bss->noise;
2082 ieee80211_rx_bss_put(local, bss);
2083 }
2084
2085 err = sta_info_insert(sta);
2086 if (err) {
2087 printk(KERN_DEBUG "%s: failed to insert STA entry for"
2088 " the AP (error %d)\n", sdata->dev->name, err);
2089 rcu_read_unlock();
2090 return;
2091 }
2092 /* update new sta with its last rx activity */
2093 sta->last_rx = jiffies;
2094 }
2095
2096 /*
2097 * FIXME: Do we really need to update the sta_info's information here?
2098 * We already know about the AP (we found it in our list) so it
2099 * should already be filled with the right info, no?
2100 * As is stands, all this is racy because typically we assume
2101 * the information that is filled in here (except flags) doesn't
2102 * change while a STA structure is alive. As such, it should move
2103 * to between the sta_info_alloc() and sta_info_insert() above.
2104 */
2105
2106 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
2107 WLAN_STA_AUTHORIZED);
2108
2109 rates = 0;
2110 basic_rates = 0;
2111 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2112
2113 for (i = 0; i < elems.supp_rates_len; i++) {
2114 int rate = (elems.supp_rates[i] & 0x7f) * 5;
2115
2116 if (rate > 110)
2117 have_higher_than_11mbit = true;
2118
2119 for (j = 0; j < sband->n_bitrates; j++) {
2120 if (sband->bitrates[j].bitrate == rate)
2121 rates |= BIT(j);
2122 if (elems.supp_rates[i] & 0x80)
2123 basic_rates |= BIT(j);
2124 }
2125 }
2126
2127 for (i = 0; i < elems.ext_supp_rates_len; i++) {
2128 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
2129
2130 if (rate > 110)
2131 have_higher_than_11mbit = true;
2132
2133 for (j = 0; j < sband->n_bitrates; j++) {
2134 if (sband->bitrates[j].bitrate == rate)
2135 rates |= BIT(j);
2136 if (elems.ext_supp_rates[i] & 0x80)
2137 basic_rates |= BIT(j);
2138 }
2139 }
2140
2141 sta->supp_rates[local->hw.conf.channel->band] = rates;
2142 sdata->basic_rates = basic_rates;
2143
2144 /* cf. IEEE 802.11 9.2.12 */
2145 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
2146 have_higher_than_11mbit)
2147 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
2148 else
2149 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
2150
2151 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2152 (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
2153 struct ieee80211_ht_bss_info bss_info;
2154 ieee80211_ht_cap_ie_to_ht_info(
2155 (struct ieee80211_ht_cap *)
2156 elems.ht_cap_elem, &sta->ht_info);
2157 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2158 (struct ieee80211_ht_addt_info *)
2159 elems.ht_info_elem, &bss_info);
2160 ieee80211_handle_ht(local, 1, &sta->ht_info, &bss_info);
2161 }
2162
2163 rate_control_rate_init(sta, local);
2164
2165 if (elems.wmm_param) {
2166 set_sta_flags(sta, WLAN_STA_WME);
2167 rcu_read_unlock();
2168 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
2169 elems.wmm_param_len);
2170 } else
2171 rcu_read_unlock();
2172
2173 /* set AID and assoc capability,
2174 * ieee80211_set_associated() will tell the driver */
2175 bss_conf->aid = aid;
2176 bss_conf->assoc_capability = capab_info;
2177 ieee80211_set_associated(sdata, ifsta, 1);
2178
2179 ieee80211_associated(sdata, ifsta);
2180 }
2181
2182
2183 /* Caller must hold local->sta_bss_lock */
2184 static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
2185 struct ieee80211_sta_bss *bss)
2186 {
2187 u8 hash_idx;
2188
2189 if (bss_mesh_cfg(bss))
2190 hash_idx = mesh_id_hash(bss_mesh_id(bss),
2191 bss_mesh_id_len(bss));
2192 else
2193 hash_idx = STA_HASH(bss->bssid);
2194
2195 bss->hnext = local->sta_bss_hash[hash_idx];
2196 local->sta_bss_hash[hash_idx] = bss;
2197 }
2198
2199
2200 /* Caller must hold local->sta_bss_lock */
2201 static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
2202 struct ieee80211_sta_bss *bss)
2203 {
2204 struct ieee80211_sta_bss *b, *prev = NULL;
2205 b = local->sta_bss_hash[STA_HASH(bss->bssid)];
2206 while (b) {
2207 if (b == bss) {
2208 if (!prev)
2209 local->sta_bss_hash[STA_HASH(bss->bssid)] =
2210 bss->hnext;
2211 else
2212 prev->hnext = bss->hnext;
2213 break;
2214 }
2215 prev = b;
2216 b = b->hnext;
2217 }
2218 }
2219
2220
2221 static struct ieee80211_sta_bss *
2222 ieee80211_rx_bss_add(struct ieee80211_sub_if_data *sdata, u8 *bssid, int freq,
2223 u8 *ssid, u8 ssid_len)
2224 {
2225 struct ieee80211_local *local = sdata->local;
2226 struct ieee80211_sta_bss *bss;
2227
2228 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2229 if (!bss)
2230 return NULL;
2231 atomic_inc(&bss->users);
2232 atomic_inc(&bss->users);
2233 memcpy(bss->bssid, bssid, ETH_ALEN);
2234 bss->freq = freq;
2235 if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
2236 memcpy(bss->ssid, ssid, ssid_len);
2237 bss->ssid_len = ssid_len;
2238 }
2239
2240 spin_lock_bh(&local->sta_bss_lock);
2241 /* TODO: order by RSSI? */
2242 list_add_tail(&bss->list, &local->sta_bss_list);
2243 __ieee80211_rx_bss_hash_add(local, bss);
2244 spin_unlock_bh(&local->sta_bss_lock);
2245 return bss;
2246 }
2247
2248 static struct ieee80211_sta_bss *
2249 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
2250 u8 *ssid, u8 ssid_len)
2251 {
2252 struct ieee80211_sta_bss *bss;
2253
2254 spin_lock_bh(&local->sta_bss_lock);
2255 bss = local->sta_bss_hash[STA_HASH(bssid)];
2256 while (bss) {
2257 if (!bss_mesh_cfg(bss) &&
2258 !memcmp(bss->bssid, bssid, ETH_ALEN) &&
2259 bss->freq == freq &&
2260 bss->ssid_len == ssid_len &&
2261 (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
2262 atomic_inc(&bss->users);
2263 break;
2264 }
2265 bss = bss->hnext;
2266 }
2267 spin_unlock_bh(&local->sta_bss_lock);
2268 return bss;
2269 }
2270
2271 #ifdef CONFIG_MAC80211_MESH
2272 static struct ieee80211_sta_bss *
2273 ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
2274 u8 *mesh_cfg, int freq)
2275 {
2276 struct ieee80211_sta_bss *bss;
2277
2278 spin_lock_bh(&local->sta_bss_lock);
2279 bss = local->sta_bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
2280 while (bss) {
2281 if (bss_mesh_cfg(bss) &&
2282 !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
2283 bss->freq == freq &&
2284 mesh_id_len == bss->mesh_id_len &&
2285 (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
2286 mesh_id_len))) {
2287 atomic_inc(&bss->users);
2288 break;
2289 }
2290 bss = bss->hnext;
2291 }
2292 spin_unlock_bh(&local->sta_bss_lock);
2293 return bss;
2294 }
2295
2296 static struct ieee80211_sta_bss *
2297 ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
2298 u8 *mesh_cfg, int mesh_config_len, int freq)
2299 {
2300 struct ieee80211_sta_bss *bss;
2301
2302 if (mesh_config_len != MESH_CFG_LEN)
2303 return NULL;
2304
2305 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2306 if (!bss)
2307 return NULL;
2308
2309 bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
2310 if (!bss->mesh_cfg) {
2311 kfree(bss);
2312 return NULL;
2313 }
2314
2315 if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
2316 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
2317 if (!bss->mesh_id) {
2318 kfree(bss->mesh_cfg);
2319 kfree(bss);
2320 return NULL;
2321 }
2322 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
2323 }
2324
2325 atomic_inc(&bss->users);
2326 atomic_inc(&bss->users);
2327 memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
2328 bss->mesh_id_len = mesh_id_len;
2329 bss->freq = freq;
2330 spin_lock_bh(&local->sta_bss_lock);
2331 /* TODO: order by RSSI? */
2332 list_add_tail(&bss->list, &local->sta_bss_list);
2333 __ieee80211_rx_bss_hash_add(local, bss);
2334 spin_unlock_bh(&local->sta_bss_lock);
2335 return bss;
2336 }
2337 #endif
2338
2339 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
2340 {
2341 kfree(bss->wpa_ie);
2342 kfree(bss->rsn_ie);
2343 kfree(bss->wmm_ie);
2344 kfree(bss->ht_ie);
2345 kfree(bss->ht_add_ie);
2346 kfree(bss_mesh_id(bss));
2347 kfree(bss_mesh_cfg(bss));
2348 kfree(bss);
2349 }
2350
2351
2352 static void ieee80211_rx_bss_put(struct ieee80211_local *local,
2353 struct ieee80211_sta_bss *bss)
2354 {
2355 local_bh_disable();
2356 if (!atomic_dec_and_lock(&bss->users, &local->sta_bss_lock)) {
2357 local_bh_enable();
2358 return;
2359 }
2360
2361 __ieee80211_rx_bss_hash_del(local, bss);
2362 list_del(&bss->list);
2363 spin_unlock_bh(&local->sta_bss_lock);
2364 ieee80211_rx_bss_free(bss);
2365 }
2366
2367
2368 void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
2369 {
2370 spin_lock_init(&local->sta_bss_lock);
2371 INIT_LIST_HEAD(&local->sta_bss_list);
2372 }
2373
2374
2375 void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
2376 {
2377 struct ieee80211_sta_bss *bss, *tmp;
2378
2379 list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
2380 ieee80211_rx_bss_put(local, bss);
2381 }
2382
2383
2384 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
2385 struct ieee80211_if_sta *ifsta,
2386 struct ieee80211_sta_bss *bss)
2387 {
2388 struct ieee80211_local *local = sdata->local;
2389 int res, rates, i, j;
2390 struct sk_buff *skb;
2391 struct ieee80211_mgmt *mgmt;
2392 u8 *pos;
2393 struct ieee80211_supported_band *sband;
2394 union iwreq_data wrqu;
2395
2396 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2397
2398 /* Remove possible STA entries from other IBSS networks. */
2399 sta_info_flush_delayed(sdata);
2400
2401 if (local->ops->reset_tsf) {
2402 /* Reset own TSF to allow time synchronization work. */
2403 local->ops->reset_tsf(local_to_hw(local));
2404 }
2405 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2406 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2407 if (res)
2408 return res;
2409
2410 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2411
2412 sdata->drop_unencrypted = bss->capability &
2413 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2414
2415 res = ieee80211_set_freq(sdata, bss->freq);
2416
2417 if (res)
2418 return res;
2419
2420 /* Build IBSS probe response */
2421 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2422 if (skb) {
2423 skb_reserve(skb, local->hw.extra_tx_headroom);
2424
2425 mgmt = (struct ieee80211_mgmt *)
2426 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2427 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2428 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2429 IEEE80211_STYPE_PROBE_RESP);
2430 memset(mgmt->da, 0xff, ETH_ALEN);
2431 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
2432 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2433 mgmt->u.beacon.beacon_int =
2434 cpu_to_le16(local->hw.conf.beacon_int);
2435 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
2436 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2437
2438 pos = skb_put(skb, 2 + ifsta->ssid_len);
2439 *pos++ = WLAN_EID_SSID;
2440 *pos++ = ifsta->ssid_len;
2441 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2442
2443 rates = bss->supp_rates_len;
2444 if (rates > 8)
2445 rates = 8;
2446 pos = skb_put(skb, 2 + rates);
2447 *pos++ = WLAN_EID_SUPP_RATES;
2448 *pos++ = rates;
2449 memcpy(pos, bss->supp_rates, rates);
2450
2451 if (bss->band == IEEE80211_BAND_2GHZ) {
2452 pos = skb_put(skb, 2 + 1);
2453 *pos++ = WLAN_EID_DS_PARAMS;
2454 *pos++ = 1;
2455 *pos++ = ieee80211_frequency_to_channel(bss->freq);
2456 }
2457
2458 pos = skb_put(skb, 2 + 2);
2459 *pos++ = WLAN_EID_IBSS_PARAMS;
2460 *pos++ = 2;
2461 /* FIX: set ATIM window based on scan results */
2462 *pos++ = 0;
2463 *pos++ = 0;
2464
2465 if (bss->supp_rates_len > 8) {
2466 rates = bss->supp_rates_len - 8;
2467 pos = skb_put(skb, 2 + rates);
2468 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2469 *pos++ = rates;
2470 memcpy(pos, &bss->supp_rates[8], rates);
2471 }
2472
2473 ifsta->probe_resp = skb;
2474
2475 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
2476 }
2477
2478 rates = 0;
2479 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2480 for (i = 0; i < bss->supp_rates_len; i++) {
2481 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2482 for (j = 0; j < sband->n_bitrates; j++)
2483 if (sband->bitrates[j].bitrate == bitrate)
2484 rates |= BIT(j);
2485 }
2486 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
2487
2488 ieee80211_sta_def_wmm_params(sdata, bss, 1);
2489
2490 ifsta->state = IEEE80211_IBSS_JOINED;
2491 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2492
2493 memset(&wrqu, 0, sizeof(wrqu));
2494 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2495 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
2496
2497 return res;
2498 }
2499
2500 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
2501 struct ieee802_11_elems *elems,
2502 enum ieee80211_band band)
2503 {
2504 struct ieee80211_supported_band *sband;
2505 struct ieee80211_rate *bitrates;
2506 size_t num_rates;
2507 u64 supp_rates;
2508 int i, j;
2509 sband = local->hw.wiphy->bands[band];
2510
2511 if (!sband) {
2512 WARN_ON(1);
2513 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2514 }
2515
2516 bitrates = sband->bitrates;
2517 num_rates = sband->n_bitrates;
2518 supp_rates = 0;
2519 for (i = 0; i < elems->supp_rates_len +
2520 elems->ext_supp_rates_len; i++) {
2521 u8 rate = 0;
2522 int own_rate;
2523 if (i < elems->supp_rates_len)
2524 rate = elems->supp_rates[i];
2525 else if (elems->ext_supp_rates)
2526 rate = elems->ext_supp_rates
2527 [i - elems->supp_rates_len];
2528 own_rate = 5 * (rate & 0x7f);
2529 for (j = 0; j < num_rates; j++)
2530 if (bitrates[j].bitrate == own_rate)
2531 supp_rates |= BIT(j);
2532 }
2533 return supp_rates;
2534 }
2535
2536
2537 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2538 struct ieee80211_mgmt *mgmt,
2539 size_t len,
2540 struct ieee80211_rx_status *rx_status,
2541 struct ieee802_11_elems *elems,
2542 int beacon)
2543 {
2544 struct ieee80211_local *local = sdata->local;
2545 int freq, clen;
2546 struct ieee80211_sta_bss *bss;
2547 struct sta_info *sta;
2548 u64 beacon_timestamp, rx_timestamp;
2549 struct ieee80211_channel *channel;
2550 DECLARE_MAC_BUF(mac);
2551 DECLARE_MAC_BUF(mac2);
2552
2553 if (!beacon && memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
2554 return; /* ignore ProbeResp to foreign address */
2555
2556 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
2557
2558 if (ieee80211_vif_is_mesh(&sdata->vif) && elems->mesh_id &&
2559 elems->mesh_config && mesh_matches_local(elems, sdata)) {
2560 u64 rates = ieee80211_sta_get_rates(local, elems,
2561 rx_status->band);
2562
2563 mesh_neighbour_update(mgmt->sa, rates, sdata,
2564 mesh_peer_accepts_plinks(elems));
2565 }
2566
2567 rcu_read_lock();
2568
2569 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && elems->supp_rates &&
2570 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0 &&
2571 (sta = sta_info_get(local, mgmt->sa))) {
2572 u64 prev_rates;
2573 u64 supp_rates = ieee80211_sta_get_rates(local, elems,
2574 rx_status->band);
2575
2576 prev_rates = sta->supp_rates[rx_status->band];
2577 sta->supp_rates[rx_status->band] &= supp_rates;
2578 if (sta->supp_rates[rx_status->band] == 0) {
2579 /* No matching rates - this should not really happen.
2580 * Make sure that at least one rate is marked
2581 * supported to avoid issues with TX rate ctrl. */
2582 sta->supp_rates[rx_status->band] =
2583 sdata->u.sta.supp_rates_bits[rx_status->band];
2584 }
2585 }
2586
2587 rcu_read_unlock();
2588
2589 if (elems->ds_params && elems->ds_params_len == 1)
2590 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
2591 else
2592 freq = rx_status->freq;
2593
2594 channel = ieee80211_get_channel(local->hw.wiphy, freq);
2595
2596 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2597 return;
2598
2599 #ifdef CONFIG_MAC80211_MESH
2600 if (elems->mesh_config)
2601 bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id,
2602 elems->mesh_id_len, elems->mesh_config, freq);
2603 else
2604 #endif
2605 bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq,
2606 elems->ssid, elems->ssid_len);
2607 if (!bss) {
2608 #ifdef CONFIG_MAC80211_MESH
2609 if (elems->mesh_config)
2610 bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id,
2611 elems->mesh_id_len, elems->mesh_config,
2612 elems->mesh_config_len, freq);
2613 else
2614 #endif
2615 bss = ieee80211_rx_bss_add(sdata, mgmt->bssid, freq,
2616 elems->ssid, elems->ssid_len);
2617 if (!bss)
2618 return;
2619 } else {
2620 #if 0
2621 /* TODO: order by RSSI? */
2622 spin_lock_bh(&local->sta_bss_lock);
2623 list_move_tail(&bss->list, &local->sta_bss_list);
2624 spin_unlock_bh(&local->sta_bss_lock);
2625 #endif
2626 }
2627
2628 /* save the ERP value so that it is available at association time */
2629 if (elems->erp_info && elems->erp_info_len >= 1) {
2630 bss->erp_value = elems->erp_info[0];
2631 bss->has_erp_value = 1;
2632 }
2633
2634 if (elems->ht_cap_elem &&
2635 (!bss->ht_ie || bss->ht_ie_len != elems->ht_cap_elem_len ||
2636 memcmp(bss->ht_ie, elems->ht_cap_elem, elems->ht_cap_elem_len))) {
2637 kfree(bss->ht_ie);
2638 bss->ht_ie = kmalloc(elems->ht_cap_elem_len + 2, GFP_ATOMIC);
2639 if (bss->ht_ie) {
2640 memcpy(bss->ht_ie, elems->ht_cap_elem - 2,
2641 elems->ht_cap_elem_len + 2);
2642 bss->ht_ie_len = elems->ht_cap_elem_len + 2;
2643 } else
2644 bss->ht_ie_len = 0;
2645 } else if (!elems->ht_cap_elem && bss->ht_ie) {
2646 kfree(bss->ht_ie);
2647 bss->ht_ie = NULL;
2648 bss->ht_ie_len = 0;
2649 }
2650
2651 if (elems->ht_info_elem &&
2652 (!bss->ht_add_ie ||
2653 bss->ht_add_ie_len != elems->ht_info_elem_len ||
2654 memcmp(bss->ht_add_ie, elems->ht_info_elem,
2655 elems->ht_info_elem_len))) {
2656 kfree(bss->ht_add_ie);
2657 bss->ht_add_ie =
2658 kmalloc(elems->ht_info_elem_len + 2, GFP_ATOMIC);
2659 if (bss->ht_add_ie) {
2660 memcpy(bss->ht_add_ie, elems->ht_info_elem - 2,
2661 elems->ht_info_elem_len + 2);
2662 bss->ht_add_ie_len = elems->ht_info_elem_len + 2;
2663 } else
2664 bss->ht_add_ie_len = 0;
2665 } else if (!elems->ht_info_elem && bss->ht_add_ie) {
2666 kfree(bss->ht_add_ie);
2667 bss->ht_add_ie = NULL;
2668 bss->ht_add_ie_len = 0;
2669 }
2670
2671 bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
2672 bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
2673
2674 if (elems->tim) {
2675 struct ieee80211_tim_ie *tim_ie =
2676 (struct ieee80211_tim_ie *)elems->tim;
2677 bss->dtim_period = tim_ie->dtim_period;
2678 }
2679
2680 /* set default value for buggy APs */
2681 if (!elems->tim || bss->dtim_period == 0)
2682 bss->dtim_period = 1;
2683
2684 bss->supp_rates_len = 0;
2685 if (elems->supp_rates) {
2686 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2687 if (clen > elems->supp_rates_len)
2688 clen = elems->supp_rates_len;
2689 memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates,
2690 clen);
2691 bss->supp_rates_len += clen;
2692 }
2693 if (elems->ext_supp_rates) {
2694 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2695 if (clen > elems->ext_supp_rates_len)
2696 clen = elems->ext_supp_rates_len;
2697 memcpy(&bss->supp_rates[bss->supp_rates_len],
2698 elems->ext_supp_rates, clen);
2699 bss->supp_rates_len += clen;
2700 }
2701
2702 bss->band = rx_status->band;
2703
2704 bss->timestamp = beacon_timestamp;
2705 bss->last_update = jiffies;
2706 bss->signal = rx_status->signal;
2707 bss->noise = rx_status->noise;
2708 bss->qual = rx_status->qual;
2709 if (!beacon && !bss->probe_resp)
2710 bss->probe_resp = true;
2711
2712 /*
2713 * In STA mode, the remaining parameters should not be overridden
2714 * by beacons because they're not necessarily accurate there.
2715 */
2716 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
2717 bss->probe_resp && beacon) {
2718 ieee80211_rx_bss_put(local, bss);
2719 return;
2720 }
2721
2722 if (elems->wpa &&
2723 (!bss->wpa_ie || bss->wpa_ie_len != elems->wpa_len ||
2724 memcmp(bss->wpa_ie, elems->wpa, elems->wpa_len))) {
2725 kfree(bss->wpa_ie);
2726 bss->wpa_ie = kmalloc(elems->wpa_len + 2, GFP_ATOMIC);
2727 if (bss->wpa_ie) {
2728 memcpy(bss->wpa_ie, elems->wpa - 2, elems->wpa_len + 2);
2729 bss->wpa_ie_len = elems->wpa_len + 2;
2730 } else
2731 bss->wpa_ie_len = 0;
2732 } else if (!elems->wpa && bss->wpa_ie) {
2733 kfree(bss->wpa_ie);
2734 bss->wpa_ie = NULL;
2735 bss->wpa_ie_len = 0;
2736 }
2737
2738 if (elems->rsn &&
2739 (!bss->rsn_ie || bss->rsn_ie_len != elems->rsn_len ||
2740 memcmp(bss->rsn_ie, elems->rsn, elems->rsn_len))) {
2741 kfree(bss->rsn_ie);
2742 bss->rsn_ie = kmalloc(elems->rsn_len + 2, GFP_ATOMIC);
2743 if (bss->rsn_ie) {
2744 memcpy(bss->rsn_ie, elems->rsn - 2, elems->rsn_len + 2);
2745 bss->rsn_ie_len = elems->rsn_len + 2;
2746 } else
2747 bss->rsn_ie_len = 0;
2748 } else if (!elems->rsn && bss->rsn_ie) {
2749 kfree(bss->rsn_ie);
2750 bss->rsn_ie = NULL;
2751 bss->rsn_ie_len = 0;
2752 }
2753
2754 /*
2755 * Cf.
2756 * http://www.wipo.int/pctdb/en/wo.jsp?wo=2007047181&IA=WO2007047181&DISPLAY=DESC
2757 *
2758 * quoting:
2759 *
2760 * In particular, "Wi-Fi CERTIFIED for WMM - Support for Multimedia
2761 * Applications with Quality of Service in Wi-Fi Networks," Wi- Fi
2762 * Alliance (September 1, 2004) is incorporated by reference herein.
2763 * The inclusion of the WMM Parameters in probe responses and
2764 * association responses is mandatory for WMM enabled networks. The
2765 * inclusion of the WMM Parameters in beacons, however, is optional.
2766 */
2767
2768 if (elems->wmm_param &&
2769 (!bss->wmm_ie || bss->wmm_ie_len != elems->wmm_param_len ||
2770 memcmp(bss->wmm_ie, elems->wmm_param, elems->wmm_param_len))) {
2771 kfree(bss->wmm_ie);
2772 bss->wmm_ie = kmalloc(elems->wmm_param_len + 2, GFP_ATOMIC);
2773 if (bss->wmm_ie) {
2774 memcpy(bss->wmm_ie, elems->wmm_param - 2,
2775 elems->wmm_param_len + 2);
2776 bss->wmm_ie_len = elems->wmm_param_len + 2;
2777 } else
2778 bss->wmm_ie_len = 0;
2779 } else if (elems->wmm_info &&
2780 (!bss->wmm_ie || bss->wmm_ie_len != elems->wmm_info_len ||
2781 memcmp(bss->wmm_ie, elems->wmm_info,
2782 elems->wmm_info_len))) {
2783 /* As for certain AP's Fifth bit is not set in WMM IE in
2784 * beacon frames.So while parsing the beacon frame the
2785 * wmm_info structure is used instead of wmm_param.
2786 * wmm_info structure was never used to set bss->wmm_ie.
2787 * This code fixes this problem by copying the WME
2788 * information from wmm_info to bss->wmm_ie and enabling
2789 * n-band association.
2790 */
2791 kfree(bss->wmm_ie);
2792 bss->wmm_ie = kmalloc(elems->wmm_info_len + 2, GFP_ATOMIC);
2793 if (bss->wmm_ie) {
2794 memcpy(bss->wmm_ie, elems->wmm_info - 2,
2795 elems->wmm_info_len + 2);
2796 bss->wmm_ie_len = elems->wmm_info_len + 2;
2797 } else
2798 bss->wmm_ie_len = 0;
2799 } else if (!elems->wmm_param && !elems->wmm_info && bss->wmm_ie) {
2800 kfree(bss->wmm_ie);
2801 bss->wmm_ie = NULL;
2802 bss->wmm_ie_len = 0;
2803 }
2804
2805 /* check if we need to merge IBSS */
2806 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
2807 !local->sta_sw_scanning && !local->sta_hw_scanning &&
2808 bss->capability & WLAN_CAPABILITY_IBSS &&
2809 bss->freq == local->oper_channel->center_freq &&
2810 elems->ssid_len == sdata->u.sta.ssid_len &&
2811 memcmp(elems->ssid, sdata->u.sta.ssid,
2812 sdata->u.sta.ssid_len) == 0) {
2813 if (rx_status->flag & RX_FLAG_TSFT) {
2814 /* in order for correct IBSS merging we need mactime
2815 *
2816 * since mactime is defined as the time the first data
2817 * symbol of the frame hits the PHY, and the timestamp
2818 * of the beacon is defined as "the time that the data
2819 * symbol containing the first bit of the timestamp is
2820 * transmitted to the PHY plus the transmitting STA’s
2821 * delays through its local PHY from the MAC-PHY
2822 * interface to its interface with the WM"
2823 * (802.11 11.1.2) - equals the time this bit arrives at
2824 * the receiver - we have to take into account the
2825 * offset between the two.
2826 * e.g: at 1 MBit that means mactime is 192 usec earlier
2827 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
2828 */
2829 int rate = local->hw.wiphy->bands[rx_status->band]->
2830 bitrates[rx_status->rate_idx].bitrate;
2831 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
2832 } else if (local && local->ops && local->ops->get_tsf)
2833 /* second best option: get current TSF */
2834 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
2835 else
2836 /* can't merge without knowing the TSF */
2837 rx_timestamp = -1LLU;
2838 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2839 printk(KERN_DEBUG "RX beacon SA=%s BSSID="
2840 "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
2841 print_mac(mac, mgmt->sa),
2842 print_mac(mac2, mgmt->bssid),
2843 (unsigned long long)rx_timestamp,
2844 (unsigned long long)beacon_timestamp,
2845 (unsigned long long)(rx_timestamp - beacon_timestamp),
2846 jiffies);
2847 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2848 if (beacon_timestamp > rx_timestamp) {
2849 #ifndef CONFIG_MAC80211_IBSS_DEBUG
2850 printk(KERN_DEBUG "%s: beacon TSF higher than "
2851 "local TSF - IBSS merge with BSSID %s\n",
2852 sdata->dev->name, print_mac(mac, mgmt->bssid));
2853 #endif
2854 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
2855 ieee80211_ibss_add_sta(sdata, NULL,
2856 mgmt->bssid, mgmt->sa,
2857 BIT(rx_status->rate_idx));
2858 }
2859 }
2860
2861 ieee80211_rx_bss_put(local, bss);
2862 }
2863
2864
2865 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2866 struct ieee80211_mgmt *mgmt,
2867 size_t len,
2868 struct ieee80211_rx_status *rx_status)
2869 {
2870 size_t baselen;
2871 struct ieee802_11_elems elems;
2872
2873 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2874 if (baselen > len)
2875 return;
2876
2877 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2878 &elems);
2879
2880 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 0);
2881 }
2882
2883
2884 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2885 struct ieee80211_mgmt *mgmt,
2886 size_t len,
2887 struct ieee80211_rx_status *rx_status)
2888 {
2889 struct ieee80211_if_sta *ifsta;
2890 size_t baselen;
2891 struct ieee802_11_elems elems;
2892 struct ieee80211_local *local = sdata->local;
2893 struct ieee80211_conf *conf = &local->hw.conf;
2894 u32 changed = 0;
2895
2896 /* Process beacon from the current BSS */
2897 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2898 if (baselen > len)
2899 return;
2900
2901 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
2902
2903 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 1);
2904
2905 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2906 return;
2907 ifsta = &sdata->u.sta;
2908
2909 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
2910 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
2911 return;
2912
2913 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
2914 elems.wmm_param_len);
2915
2916 /* Do not send changes to driver if we are scanning. This removes
2917 * requirement that driver's bss_info_changed function needs to be
2918 * atomic. */
2919 if (local->sta_sw_scanning || local->sta_hw_scanning)
2920 return;
2921
2922 if (elems.erp_info && elems.erp_info_len >= 1)
2923 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
2924 else {
2925 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
2926 changed |= ieee80211_handle_protect_preamb(sdata, false,
2927 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
2928 }
2929
2930 if (elems.ht_cap_elem && elems.ht_info_elem &&
2931 elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
2932 struct ieee80211_ht_bss_info bss_info;
2933
2934 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2935 (struct ieee80211_ht_addt_info *)
2936 elems.ht_info_elem, &bss_info);
2937 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
2938 &bss_info);
2939 }
2940
2941 ieee80211_bss_info_change_notify(sdata, changed);
2942 }
2943
2944
2945 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
2946 struct ieee80211_if_sta *ifsta,
2947 struct ieee80211_mgmt *mgmt,
2948 size_t len,
2949 struct ieee80211_rx_status *rx_status)
2950 {
2951 struct ieee80211_local *local = sdata->local;
2952 int tx_last_beacon;
2953 struct sk_buff *skb;
2954 struct ieee80211_mgmt *resp;
2955 u8 *pos, *end;
2956 DECLARE_MAC_BUF(mac);
2957 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2958 DECLARE_MAC_BUF(mac2);
2959 DECLARE_MAC_BUF(mac3);
2960 #endif
2961
2962 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS ||
2963 ifsta->state != IEEE80211_IBSS_JOINED ||
2964 len < 24 + 2 || !ifsta->probe_resp)
2965 return;
2966
2967 if (local->ops->tx_last_beacon)
2968 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2969 else
2970 tx_last_beacon = 1;
2971
2972 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2973 printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
2974 "%s (tx_last_beacon=%d)\n",
2975 sdata->dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
2976 print_mac(mac3, mgmt->bssid), tx_last_beacon);
2977 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2978
2979 if (!tx_last_beacon)
2980 return;
2981
2982 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2983 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2984 return;
2985
2986 end = ((u8 *) mgmt) + len;
2987 pos = mgmt->u.probe_req.variable;
2988 if (pos[0] != WLAN_EID_SSID ||
2989 pos + 2 + pos[1] > end) {
2990 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2991 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2992 "from %s\n",
2993 sdata->dev->name, print_mac(mac, mgmt->sa));
2994 #endif
2995 return;
2996 }
2997 if (pos[1] != 0 &&
2998 (pos[1] != ifsta->ssid_len ||
2999 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
3000 /* Ignore ProbeReq for foreign SSID */
3001 return;
3002 }
3003
3004 /* Reply with ProbeResp */
3005 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
3006 if (!skb)
3007 return;
3008
3009 resp = (struct ieee80211_mgmt *) skb->data;
3010 memcpy(resp->da, mgmt->sa, ETH_ALEN);
3011 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3012 printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
3013 sdata->dev->name, print_mac(mac, resp->da));
3014 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3015 ieee80211_sta_tx(sdata, skb, 0);
3016 }
3017
3018 static void ieee80211_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
3019 struct ieee80211_if_sta *ifsta,
3020 struct ieee80211_mgmt *mgmt,
3021 size_t len,
3022 struct ieee80211_rx_status *rx_status)
3023 {
3024 struct ieee80211_local *local = sdata->local;
3025
3026 if (len < IEEE80211_MIN_ACTION_SIZE)
3027 return;
3028
3029 switch (mgmt->u.action.category) {
3030 case WLAN_CATEGORY_SPECTRUM_MGMT:
3031 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
3032 break;
3033 switch (mgmt->u.action.u.chan_switch.action_code) {
3034 case WLAN_ACTION_SPCT_MSR_REQ:
3035 if (len < (IEEE80211_MIN_ACTION_SIZE +
3036 sizeof(mgmt->u.action.u.measurement)))
3037 break;
3038 ieee80211_sta_process_measurement_req(sdata, mgmt, len);
3039 break;
3040 }
3041 break;
3042 case WLAN_CATEGORY_BACK:
3043 switch (mgmt->u.action.u.addba_req.action_code) {
3044 case WLAN_ACTION_ADDBA_REQ:
3045 if (len < (IEEE80211_MIN_ACTION_SIZE +
3046 sizeof(mgmt->u.action.u.addba_req)))
3047 break;
3048 ieee80211_sta_process_addba_request(local, mgmt, len);
3049 break;
3050 case WLAN_ACTION_ADDBA_RESP:
3051 if (len < (IEEE80211_MIN_ACTION_SIZE +
3052 sizeof(mgmt->u.action.u.addba_resp)))
3053 break;
3054 ieee80211_sta_process_addba_resp(local, mgmt, len);
3055 break;
3056 case WLAN_ACTION_DELBA:
3057 if (len < (IEEE80211_MIN_ACTION_SIZE +
3058 sizeof(mgmt->u.action.u.delba)))
3059 break;
3060 ieee80211_sta_process_delba(sdata, mgmt, len);
3061 break;
3062 }
3063 break;
3064 case PLINK_CATEGORY:
3065 if (ieee80211_vif_is_mesh(&sdata->vif))
3066 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
3067 break;
3068 case MESH_PATH_SEL_CATEGORY:
3069 if (ieee80211_vif_is_mesh(&sdata->vif))
3070 mesh_rx_path_sel_frame(sdata, mgmt, len);
3071 break;
3072 }
3073 }
3074
3075 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
3076 struct ieee80211_rx_status *rx_status)
3077 {
3078 struct ieee80211_local *local = sdata->local;
3079 struct ieee80211_if_sta *ifsta;
3080 struct ieee80211_mgmt *mgmt;
3081 u16 fc;
3082
3083 if (skb->len < 24)
3084 goto fail;
3085
3086 ifsta = &sdata->u.sta;
3087
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 case IEEE80211_STYPE_PROBE_RESP:
3094 case IEEE80211_STYPE_BEACON:
3095 case IEEE80211_STYPE_ACTION:
3096 memcpy(skb->cb, rx_status, sizeof(*rx_status));
3097 case IEEE80211_STYPE_AUTH:
3098 case IEEE80211_STYPE_ASSOC_RESP:
3099 case IEEE80211_STYPE_REASSOC_RESP:
3100 case IEEE80211_STYPE_DEAUTH:
3101 case IEEE80211_STYPE_DISASSOC:
3102 skb_queue_tail(&ifsta->skb_queue, skb);
3103 queue_work(local->hw.workqueue, &ifsta->work);
3104 return;
3105 }
3106
3107 fail:
3108 kfree_skb(skb);
3109 }
3110
3111
3112 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3113 struct sk_buff *skb)
3114 {
3115 struct ieee80211_rx_status *rx_status;
3116 struct ieee80211_if_sta *ifsta;
3117 struct ieee80211_mgmt *mgmt;
3118 u16 fc;
3119
3120 ifsta = &sdata->u.sta;
3121
3122 rx_status = (struct ieee80211_rx_status *) skb->cb;
3123 mgmt = (struct ieee80211_mgmt *) skb->data;
3124 fc = le16_to_cpu(mgmt->frame_control);
3125
3126 switch (fc & IEEE80211_FCTL_STYPE) {
3127 case IEEE80211_STYPE_PROBE_REQ:
3128 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
3129 rx_status);
3130 break;
3131 case IEEE80211_STYPE_PROBE_RESP:
3132 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
3133 break;
3134 case IEEE80211_STYPE_BEACON:
3135 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3136 break;
3137 case IEEE80211_STYPE_AUTH:
3138 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
3139 break;
3140 case IEEE80211_STYPE_ASSOC_RESP:
3141 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
3142 break;
3143 case IEEE80211_STYPE_REASSOC_RESP:
3144 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
3145 break;
3146 case IEEE80211_STYPE_DEAUTH:
3147 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
3148 break;
3149 case IEEE80211_STYPE_DISASSOC:
3150 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
3151 break;
3152 case IEEE80211_STYPE_ACTION:
3153 ieee80211_rx_mgmt_action(sdata, ifsta, mgmt, skb->len, rx_status);
3154 break;
3155 }
3156
3157 kfree_skb(skb);
3158 }
3159
3160
3161 ieee80211_rx_result
3162 ieee80211_sta_rx_scan(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
3163 struct ieee80211_rx_status *rx_status)
3164 {
3165 struct ieee80211_mgmt *mgmt;
3166 __le16 fc;
3167
3168 if (skb->len < 2)
3169 return RX_DROP_UNUSABLE;
3170
3171 mgmt = (struct ieee80211_mgmt *) skb->data;
3172 fc = mgmt->frame_control;
3173
3174 if (ieee80211_is_ctl(fc))
3175 return RX_CONTINUE;
3176
3177 if (skb->len < 24)
3178 return RX_DROP_MONITOR;
3179
3180 if (ieee80211_is_probe_resp(fc)) {
3181 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
3182 dev_kfree_skb(skb);
3183 return RX_QUEUED;
3184 }
3185
3186 if (ieee80211_is_beacon(fc)) {
3187 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3188 dev_kfree_skb(skb);
3189 return RX_QUEUED;
3190 }
3191
3192 return RX_CONTINUE;
3193 }
3194
3195
3196 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
3197 {
3198 struct ieee80211_local *local = sdata->local;
3199 int active = 0;
3200 struct sta_info *sta;
3201
3202 rcu_read_lock();
3203
3204 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3205 if (sta->sdata == sdata &&
3206 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
3207 jiffies)) {
3208 active++;
3209 break;
3210 }
3211 }
3212
3213 rcu_read_unlock();
3214
3215 return active;
3216 }
3217
3218
3219 static void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, unsigned long exp_time)
3220 {
3221 struct ieee80211_local *local = sdata->local;
3222 struct sta_info *sta, *tmp;
3223 LIST_HEAD(tmp_list);
3224 DECLARE_MAC_BUF(mac);
3225 unsigned long flags;
3226
3227 spin_lock_irqsave(&local->sta_lock, flags);
3228 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
3229 if (time_after(jiffies, sta->last_rx + exp_time)) {
3230 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3231 printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
3232 sdata->dev->name, print_mac(mac, sta->addr));
3233 #endif
3234 __sta_info_unlink(&sta);
3235 if (sta)
3236 list_add(&sta->list, &tmp_list);
3237 }
3238 spin_unlock_irqrestore(&local->sta_lock, flags);
3239
3240 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
3241 sta_info_destroy(sta);
3242 }
3243
3244
3245 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
3246 struct ieee80211_if_sta *ifsta)
3247 {
3248 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
3249
3250 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
3251 if (ieee80211_sta_active_ibss(sdata))
3252 return;
3253
3254 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
3255 "IBSS networks with same SSID (merge)\n", sdata->dev->name);
3256 ieee80211_sta_req_scan(sdata, ifsta->ssid, ifsta->ssid_len);
3257 }
3258
3259
3260 #ifdef CONFIG_MAC80211_MESH
3261 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
3262 struct ieee80211_if_sta *ifsta)
3263 {
3264 bool free_plinks;
3265
3266 ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
3267 mesh_path_expire(sdata);
3268
3269 free_plinks = mesh_plink_availables(sdata);
3270 if (free_plinks != sdata->u.sta.accepting_plinks)
3271 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3272
3273 mod_timer(&ifsta->timer, jiffies +
3274 IEEE80211_MESH_HOUSEKEEPING_INTERVAL);
3275 }
3276
3277
3278 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
3279 {
3280 struct ieee80211_if_sta *ifsta;
3281 ifsta = &sdata->u.sta;
3282 ifsta->state = IEEE80211_MESH_UP;
3283 ieee80211_sta_timer((unsigned long)sdata);
3284 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3285 }
3286 #endif
3287
3288
3289 void ieee80211_sta_timer(unsigned long data)
3290 {
3291 struct ieee80211_sub_if_data *sdata =
3292 (struct ieee80211_sub_if_data *) data;
3293 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3294 struct ieee80211_local *local = sdata->local;
3295
3296 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3297 queue_work(local->hw.workqueue, &ifsta->work);
3298 }
3299
3300 void ieee80211_sta_work(struct work_struct *work)
3301 {
3302 struct ieee80211_sub_if_data *sdata =
3303 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
3304 struct ieee80211_local *local = sdata->local;
3305 struct ieee80211_if_sta *ifsta;
3306 struct sk_buff *skb;
3307
3308 if (!netif_running(sdata->dev))
3309 return;
3310
3311 if (local->sta_sw_scanning || local->sta_hw_scanning)
3312 return;
3313
3314 if (WARN_ON(sdata->vif.type != IEEE80211_IF_TYPE_STA &&
3315 sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
3316 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
3317 return;
3318 ifsta = &sdata->u.sta;
3319
3320 while ((skb = skb_dequeue(&ifsta->skb_queue)))
3321 ieee80211_sta_rx_queued_mgmt(sdata, skb);
3322
3323 #ifdef CONFIG_MAC80211_MESH
3324 if (ifsta->preq_queue_len &&
3325 time_after(jiffies,
3326 ifsta->last_preq + msecs_to_jiffies(ifsta->mshcfg.dot11MeshHWMPpreqMinInterval)))
3327 mesh_path_start_discovery(sdata);
3328 #endif
3329
3330 if (ifsta->state != IEEE80211_AUTHENTICATE &&
3331 ifsta->state != IEEE80211_ASSOCIATE &&
3332 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
3333 if (ifsta->scan_ssid_len)
3334 ieee80211_sta_start_scan(sdata, ifsta->scan_ssid, ifsta->scan_ssid_len);
3335 else
3336 ieee80211_sta_start_scan(sdata, NULL, 0);
3337 return;
3338 }
3339
3340 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
3341 if (ieee80211_sta_config_auth(sdata, ifsta))
3342 return;
3343 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3344 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
3345 return;
3346
3347 switch (ifsta->state) {
3348 case IEEE80211_DISABLED:
3349 break;
3350 case IEEE80211_AUTHENTICATE:
3351 ieee80211_authenticate(sdata, ifsta);
3352 break;
3353 case IEEE80211_ASSOCIATE:
3354 ieee80211_associate(sdata, ifsta);
3355 break;
3356 case IEEE80211_ASSOCIATED:
3357 ieee80211_associated(sdata, ifsta);
3358 break;
3359 case IEEE80211_IBSS_SEARCH:
3360 ieee80211_sta_find_ibss(sdata, ifsta);
3361 break;
3362 case IEEE80211_IBSS_JOINED:
3363 ieee80211_sta_merge_ibss(sdata, ifsta);
3364 break;
3365 #ifdef CONFIG_MAC80211_MESH
3366 case IEEE80211_MESH_UP:
3367 ieee80211_mesh_housekeeping(sdata, ifsta);
3368 break;
3369 #endif
3370 default:
3371 WARN_ON(1);
3372 break;
3373 }
3374
3375 if (ieee80211_privacy_mismatch(sdata, ifsta)) {
3376 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
3377 "mixed-cell disabled - disassociate\n", sdata->dev->name);
3378
3379 ieee80211_send_disassoc(sdata, ifsta, WLAN_REASON_UNSPECIFIED);
3380 ieee80211_set_disassoc(sdata, ifsta, 0);
3381 }
3382 }
3383
3384
3385 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
3386 struct ieee80211_if_sta *ifsta)
3387 {
3388 struct ieee80211_local *local = sdata->local;
3389
3390 if (local->ops->reset_tsf) {
3391 /* Reset own TSF to allow time synchronization work. */
3392 local->ops->reset_tsf(local_to_hw(local));
3393 }
3394
3395 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
3396
3397
3398 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
3399 ifsta->auth_alg = WLAN_AUTH_OPEN;
3400 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
3401 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
3402 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
3403 ifsta->auth_alg = WLAN_AUTH_LEAP;
3404 else
3405 ifsta->auth_alg = WLAN_AUTH_OPEN;
3406 ifsta->auth_transaction = -1;
3407 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
3408 ifsta->auth_tries = ifsta->assoc_tries = 0;
3409 netif_carrier_off(sdata->dev);
3410 }
3411
3412
3413 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
3414 struct ieee80211_if_sta *ifsta)
3415 {
3416 struct ieee80211_local *local = sdata->local;
3417
3418 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3419 return;
3420
3421 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
3422 IEEE80211_STA_AUTO_BSSID_SEL)) &&
3423 (ifsta->flags & (IEEE80211_STA_SSID_SET |
3424 IEEE80211_STA_AUTO_SSID_SEL))) {
3425 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3426 queue_work(local->hw.workqueue, &ifsta->work);
3427 }
3428 }
3429
3430 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
3431 const char *ssid, int ssid_len)
3432 {
3433 int tmp, hidden_ssid;
3434
3435 if (ssid_len == ifsta->ssid_len &&
3436 !memcmp(ifsta->ssid, ssid, ssid_len))
3437 return 1;
3438
3439 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
3440 return 0;
3441
3442 hidden_ssid = 1;
3443 tmp = ssid_len;
3444 while (tmp--) {
3445 if (ssid[tmp] != '\0') {
3446 hidden_ssid = 0;
3447 break;
3448 }
3449 }
3450
3451 if (hidden_ssid && ifsta->ssid_len == ssid_len)
3452 return 1;
3453
3454 if (ssid_len == 1 && ssid[0] == ' ')
3455 return 1;
3456
3457 return 0;
3458 }
3459
3460 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
3461 struct ieee80211_if_sta *ifsta)
3462 {
3463 struct ieee80211_local *local = sdata->local;
3464 struct ieee80211_sta_bss *bss, *selected = NULL;
3465 int top_rssi = 0, freq;
3466
3467 spin_lock_bh(&local->sta_bss_lock);
3468 freq = local->oper_channel->center_freq;
3469 list_for_each_entry(bss, &local->sta_bss_list, list) {
3470 if (!(bss->capability & WLAN_CAPABILITY_ESS))
3471 continue;
3472
3473 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
3474 IEEE80211_STA_AUTO_BSSID_SEL |
3475 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
3476 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
3477 !!sdata->default_key))
3478 continue;
3479
3480 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
3481 bss->freq != freq)
3482 continue;
3483
3484 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
3485 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
3486 continue;
3487
3488 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
3489 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
3490 continue;
3491
3492 if (!selected || top_rssi < bss->signal) {
3493 selected = bss;
3494 top_rssi = bss->signal;
3495 }
3496 }
3497 if (selected)
3498 atomic_inc(&selected->users);
3499 spin_unlock_bh(&local->sta_bss_lock);
3500
3501 if (selected) {
3502 ieee80211_set_freq(sdata, selected->freq);
3503 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
3504 ieee80211_sta_set_ssid(sdata, selected->ssid,
3505 selected->ssid_len);
3506 ieee80211_sta_set_bssid(sdata, selected->bssid);
3507 ieee80211_sta_def_wmm_params(sdata, selected, 0);
3508 ieee80211_rx_bss_put(local, selected);
3509 ifsta->state = IEEE80211_AUTHENTICATE;
3510 ieee80211_sta_reset_auth(sdata, ifsta);
3511 return 0;
3512 } else {
3513 if (ifsta->state != IEEE80211_AUTHENTICATE) {
3514 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
3515 ieee80211_sta_start_scan(sdata, NULL, 0);
3516 else
3517 ieee80211_sta_start_scan(sdata, ifsta->ssid,
3518 ifsta->ssid_len);
3519 ifsta->state = IEEE80211_AUTHENTICATE;
3520 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3521 } else
3522 ifsta->state = IEEE80211_DISABLED;
3523 }
3524 return -1;
3525 }
3526
3527
3528 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
3529 struct ieee80211_if_sta *ifsta)
3530 {
3531 struct ieee80211_local *local = sdata->local;
3532 struct ieee80211_sta_bss *bss;
3533 struct ieee80211_supported_band *sband;
3534 u8 bssid[ETH_ALEN], *pos;
3535 int i;
3536 int ret;
3537 DECLARE_MAC_BUF(mac);
3538
3539 #if 0
3540 /* Easier testing, use fixed BSSID. */
3541 memset(bssid, 0xfe, ETH_ALEN);
3542 #else
3543 /* Generate random, not broadcast, locally administered BSSID. Mix in
3544 * own MAC address to make sure that devices that do not have proper
3545 * random number generator get different BSSID. */
3546 get_random_bytes(bssid, ETH_ALEN);
3547 for (i = 0; i < ETH_ALEN; i++)
3548 bssid[i] ^= sdata->dev->dev_addr[i];
3549 bssid[0] &= ~0x01;
3550 bssid[0] |= 0x02;
3551 #endif
3552
3553 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
3554 sdata->dev->name, print_mac(mac, bssid));
3555
3556 bss = ieee80211_rx_bss_add(sdata, bssid,
3557 local->hw.conf.channel->center_freq,
3558 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
3559 if (!bss)
3560 return -ENOMEM;
3561
3562 bss->band = local->hw.conf.channel->band;
3563 sband = local->hw.wiphy->bands[bss->band];
3564
3565 if (local->hw.conf.beacon_int == 0)
3566 local->hw.conf.beacon_int = 100;
3567 bss->beacon_int = local->hw.conf.beacon_int;
3568 bss->last_update = jiffies;
3569 bss->capability = WLAN_CAPABILITY_IBSS;
3570
3571 if (sdata->default_key)
3572 bss->capability |= WLAN_CAPABILITY_PRIVACY;
3573 else
3574 sdata->drop_unencrypted = 0;
3575
3576 bss->supp_rates_len = sband->n_bitrates;
3577 pos = bss->supp_rates;
3578 for (i = 0; i < sband->n_bitrates; i++) {
3579 int rate = sband->bitrates[i].bitrate;
3580 *pos++ = (u8) (rate / 5);
3581 }
3582
3583 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
3584 ieee80211_rx_bss_put(local, bss);
3585 return ret;
3586 }
3587
3588
3589 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
3590 struct ieee80211_if_sta *ifsta)
3591 {
3592 struct ieee80211_local *local = sdata->local;
3593 struct ieee80211_sta_bss *bss;
3594 int found = 0;
3595 u8 bssid[ETH_ALEN];
3596 int active_ibss;
3597 DECLARE_MAC_BUF(mac);
3598 DECLARE_MAC_BUF(mac2);
3599
3600 if (ifsta->ssid_len == 0)
3601 return -EINVAL;
3602
3603 active_ibss = ieee80211_sta_active_ibss(sdata);
3604 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3605 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
3606 sdata->dev->name, active_ibss);
3607 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3608 spin_lock_bh(&local->sta_bss_lock);
3609 list_for_each_entry(bss, &local->sta_bss_list, list) {
3610 if (ifsta->ssid_len != bss->ssid_len ||
3611 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
3612 || !(bss->capability & WLAN_CAPABILITY_IBSS))
3613 continue;
3614 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3615 printk(KERN_DEBUG " bssid=%s found\n",
3616 print_mac(mac, bss->bssid));
3617 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3618 memcpy(bssid, bss->bssid, ETH_ALEN);
3619 found = 1;
3620 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
3621 break;
3622 }
3623 spin_unlock_bh(&local->sta_bss_lock);
3624
3625 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3626 if (found)
3627 printk(KERN_DEBUG " sta_find_ibss: selected %s current "
3628 "%s\n", print_mac(mac, bssid),
3629 print_mac(mac2, ifsta->bssid));
3630 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3631
3632 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3633 int ret;
3634 int search_freq;
3635
3636 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
3637 search_freq = bss->freq;
3638 else
3639 search_freq = local->hw.conf.channel->center_freq;
3640
3641 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
3642 ifsta->ssid, ifsta->ssid_len);
3643 if (!bss)
3644 goto dont_join;
3645
3646 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
3647 " based on configured SSID\n",
3648 sdata->dev->name, print_mac(mac, bssid));
3649 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
3650 ieee80211_rx_bss_put(local, bss);
3651 return ret;
3652 }
3653
3654 dont_join:
3655 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3656 printk(KERN_DEBUG " did not try to join ibss\n");
3657 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3658
3659 /* Selected IBSS not found in current scan results - try to scan */
3660 if (ifsta->state == IEEE80211_IBSS_JOINED &&
3661 !ieee80211_sta_active_ibss(sdata)) {
3662 mod_timer(&ifsta->timer, jiffies +
3663 IEEE80211_IBSS_MERGE_INTERVAL);
3664 } else if (time_after(jiffies, local->last_scan_completed +
3665 IEEE80211_SCAN_INTERVAL)) {
3666 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
3667 "join\n", sdata->dev->name);
3668 return ieee80211_sta_req_scan(sdata, ifsta->ssid,
3669 ifsta->ssid_len);
3670 } else if (ifsta->state != IEEE80211_IBSS_JOINED) {
3671 int interval = IEEE80211_SCAN_INTERVAL;
3672
3673 if (time_after(jiffies, ifsta->ibss_join_req +
3674 IEEE80211_IBSS_JOIN_TIMEOUT)) {
3675 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
3676 (!(local->oper_channel->flags &
3677 IEEE80211_CHAN_NO_IBSS)))
3678 return ieee80211_sta_create_ibss(sdata, ifsta);
3679 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
3680 printk(KERN_DEBUG "%s: IBSS not allowed on"
3681 " %d MHz\n", sdata->dev->name,
3682 local->hw.conf.channel->center_freq);
3683 }
3684
3685 /* No IBSS found - decrease scan interval and continue
3686 * scanning. */
3687 interval = IEEE80211_SCAN_INTERVAL_SLOW;
3688 }
3689
3690 ifsta->state = IEEE80211_IBSS_SEARCH;
3691 mod_timer(&ifsta->timer, jiffies + interval);
3692 return 0;
3693 }
3694
3695 return 0;
3696 }
3697
3698
3699 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
3700 {
3701 struct ieee80211_if_sta *ifsta;
3702 int res;
3703
3704 if (len > IEEE80211_MAX_SSID_LEN)
3705 return -EINVAL;
3706
3707 ifsta = &sdata->u.sta;
3708
3709 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
3710 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
3711 memcpy(ifsta->ssid, ssid, len);
3712 ifsta->ssid_len = len;
3713 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
3714
3715 res = 0;
3716 /*
3717 * Hack! MLME code needs to be cleaned up to have different
3718 * entry points for configuration and internal selection change
3719 */
3720 if (netif_running(sdata->dev))
3721 res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
3722 if (res) {
3723 printk(KERN_DEBUG "%s: Failed to config new SSID to "
3724 "the low-level driver\n", sdata->dev->name);
3725 return res;
3726 }
3727 }
3728
3729 if (len)
3730 ifsta->flags |= IEEE80211_STA_SSID_SET;
3731 else
3732 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
3733
3734 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3735 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
3736 ifsta->ibss_join_req = jiffies;
3737 ifsta->state = IEEE80211_IBSS_SEARCH;
3738 return ieee80211_sta_find_ibss(sdata, ifsta);
3739 }
3740
3741 return 0;
3742 }
3743
3744
3745 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
3746 {
3747 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3748 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
3749 *len = ifsta->ssid_len;
3750 return 0;
3751 }
3752
3753
3754 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
3755 {
3756 struct ieee80211_if_sta *ifsta;
3757 int res;
3758
3759 ifsta = &sdata->u.sta;
3760
3761 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3762 memcpy(ifsta->bssid, bssid, ETH_ALEN);
3763 res = 0;
3764 /*
3765 * Hack! See also ieee80211_sta_set_ssid.
3766 */
3767 if (netif_running(sdata->dev))
3768 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
3769 if (res) {
3770 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
3771 "the low-level driver\n", sdata->dev->name);
3772 return res;
3773 }
3774 }
3775
3776 if (is_valid_ether_addr(bssid))
3777 ifsta->flags |= IEEE80211_STA_BSSID_SET;
3778 else
3779 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
3780
3781 return 0;
3782 }
3783
3784
3785 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
3786 struct ieee80211_sub_if_data *sdata,
3787 int powersave)
3788 {
3789 struct sk_buff *skb;
3790 struct ieee80211_hdr *nullfunc;
3791 __le16 fc;
3792
3793 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
3794 if (!skb) {
3795 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
3796 "frame\n", sdata->dev->name);
3797 return;
3798 }
3799 skb_reserve(skb, local->hw.extra_tx_headroom);
3800
3801 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
3802 memset(nullfunc, 0, 24);
3803 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
3804 IEEE80211_FCTL_TODS);
3805 if (powersave)
3806 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
3807 nullfunc->frame_control = fc;
3808 memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
3809 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
3810 memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
3811
3812 ieee80211_sta_tx(sdata, skb, 0);
3813 }
3814
3815
3816 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3817 {
3818 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
3819 ieee80211_vif_is_mesh(&sdata->vif))
3820 ieee80211_sta_timer((unsigned long)sdata);
3821 }
3822
3823 void ieee80211_scan_completed(struct ieee80211_hw *hw)
3824 {
3825 struct ieee80211_local *local = hw_to_local(hw);
3826 struct net_device *dev = local->scan_dev;
3827 struct ieee80211_sub_if_data *sdata;
3828 union iwreq_data wrqu;
3829
3830 local->last_scan_completed = jiffies;
3831 memset(&wrqu, 0, sizeof(wrqu));
3832 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
3833
3834 if (local->sta_hw_scanning) {
3835 local->sta_hw_scanning = 0;
3836 if (ieee80211_hw_config(local))
3837 printk(KERN_DEBUG "%s: failed to restore operational "
3838 "channel after scan\n", dev->name);
3839 /* Restart STA timer for HW scan case */
3840 rcu_read_lock();
3841 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3842 ieee80211_restart_sta_timer(sdata);
3843 rcu_read_unlock();
3844
3845 goto done;
3846 }
3847
3848 local->sta_sw_scanning = 0;
3849 if (ieee80211_hw_config(local))
3850 printk(KERN_DEBUG "%s: failed to restore operational "
3851 "channel after scan\n", dev->name);
3852
3853
3854 netif_tx_lock_bh(local->mdev);
3855 netif_addr_lock(local->mdev);
3856 local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
3857 local->ops->configure_filter(local_to_hw(local),
3858 FIF_BCN_PRBRESP_PROMISC,
3859 &local->filter_flags,
3860 local->mdev->mc_count,
3861 local->mdev->mc_list);
3862
3863 netif_addr_unlock(local->mdev);
3864 netif_tx_unlock_bh(local->mdev);
3865
3866 rcu_read_lock();
3867 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3868 /* Tell AP we're back */
3869 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
3870 sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED)
3871 ieee80211_send_nullfunc(local, sdata, 0);
3872
3873 ieee80211_restart_sta_timer(sdata);
3874
3875 netif_wake_queue(sdata->dev);
3876 }
3877 rcu_read_unlock();
3878
3879 done:
3880 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3881 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
3882 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3883 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
3884 (!(ifsta->state == IEEE80211_IBSS_JOINED) &&
3885 !ieee80211_sta_active_ibss(sdata)))
3886 ieee80211_sta_find_ibss(sdata, ifsta);
3887 }
3888 }
3889 EXPORT_SYMBOL(ieee80211_scan_completed);
3890
3891 void ieee80211_sta_scan_work(struct work_struct *work)
3892 {
3893 struct ieee80211_local *local =
3894 container_of(work, struct ieee80211_local, scan_work.work);
3895 struct net_device *dev = local->scan_dev;
3896 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3897 struct ieee80211_supported_band *sband;
3898 struct ieee80211_channel *chan;
3899 int skip;
3900 unsigned long next_delay = 0;
3901
3902 if (!local->sta_sw_scanning)
3903 return;
3904
3905 switch (local->scan_state) {
3906 case SCAN_SET_CHANNEL:
3907 /*
3908 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
3909 * after we successfully scanned the last channel of the last
3910 * band (and the last band is supported by the hw)
3911 */
3912 if (local->scan_band < IEEE80211_NUM_BANDS)
3913 sband = local->hw.wiphy->bands[local->scan_band];
3914 else
3915 sband = NULL;
3916
3917 /*
3918 * If we are at an unsupported band and have more bands
3919 * left to scan, advance to the next supported one.
3920 */
3921 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
3922 local->scan_band++;
3923 sband = local->hw.wiphy->bands[local->scan_band];
3924 local->scan_channel_idx = 0;
3925 }
3926
3927 /* if no more bands/channels left, complete scan */
3928 if (!sband || local->scan_channel_idx >= sband->n_channels) {
3929 ieee80211_scan_completed(local_to_hw(local));
3930 return;
3931 }
3932 skip = 0;
3933 chan = &sband->channels[local->scan_channel_idx];
3934
3935 if (chan->flags & IEEE80211_CHAN_DISABLED ||
3936 (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3937 chan->flags & IEEE80211_CHAN_NO_IBSS))
3938 skip = 1;
3939
3940 if (!skip) {
3941 local->scan_channel = chan;
3942 if (ieee80211_hw_config(local)) {
3943 printk(KERN_DEBUG "%s: failed to set freq to "
3944 "%d MHz for scan\n", dev->name,
3945 chan->center_freq);
3946 skip = 1;
3947 }
3948 }
3949
3950 /* advance state machine to next channel/band */
3951 local->scan_channel_idx++;
3952 if (local->scan_channel_idx >= sband->n_channels) {
3953 /*
3954 * scan_band may end up == IEEE80211_NUM_BANDS, but
3955 * we'll catch that case above and complete the scan
3956 * if that is the case.
3957 */
3958 local->scan_band++;
3959 local->scan_channel_idx = 0;
3960 }
3961
3962 if (skip)
3963 break;
3964
3965 next_delay = IEEE80211_PROBE_DELAY +
3966 usecs_to_jiffies(local->hw.channel_change_time);
3967 local->scan_state = SCAN_SEND_PROBE;
3968 break;
3969 case SCAN_SEND_PROBE:
3970 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
3971 local->scan_state = SCAN_SET_CHANNEL;
3972
3973 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
3974 break;
3975 ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
3976 local->scan_ssid_len);
3977 next_delay = IEEE80211_CHANNEL_TIME;
3978 break;
3979 }
3980
3981 if (local->sta_sw_scanning)
3982 queue_delayed_work(local->hw.workqueue, &local->scan_work,
3983 next_delay);
3984 }
3985
3986
3987 static int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata,
3988 u8 *ssid, size_t ssid_len)
3989 {
3990 struct ieee80211_local *local = scan_sdata->local;
3991 struct ieee80211_sub_if_data *sdata;
3992
3993 if (ssid_len > IEEE80211_MAX_SSID_LEN)
3994 return -EINVAL;
3995
3996 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
3997 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
3998 * BSSID: MACAddress
3999 * SSID
4000 * ScanType: ACTIVE, PASSIVE
4001 * ProbeDelay: delay (in microseconds) to be used prior to transmitting
4002 * a Probe frame during active scanning
4003 * ChannelList
4004 * MinChannelTime (>= ProbeDelay), in TU
4005 * MaxChannelTime: (>= MinChannelTime), in TU
4006 */
4007
4008 /* MLME-SCAN.confirm
4009 * BSSDescriptionSet
4010 * ResultCode: SUCCESS, INVALID_PARAMETERS
4011 */
4012
4013 if (local->sta_sw_scanning || local->sta_hw_scanning) {
4014 if (local->scan_dev == scan_sdata->dev)
4015 return 0;
4016 return -EBUSY;
4017 }
4018
4019 if (local->ops->hw_scan) {
4020 int rc = local->ops->hw_scan(local_to_hw(local),
4021 ssid, ssid_len);
4022 if (!rc) {
4023 local->sta_hw_scanning = 1;
4024 local->scan_dev = scan_sdata->dev;
4025 }
4026 return rc;
4027 }
4028
4029 local->sta_sw_scanning = 1;
4030
4031 rcu_read_lock();
4032 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4033 netif_stop_queue(sdata->dev);
4034 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
4035 (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED))
4036 ieee80211_send_nullfunc(local, sdata, 1);
4037 }
4038 rcu_read_unlock();
4039
4040 if (ssid) {
4041 local->scan_ssid_len = ssid_len;
4042 memcpy(local->scan_ssid, ssid, ssid_len);
4043 } else
4044 local->scan_ssid_len = 0;
4045 local->scan_state = SCAN_SET_CHANNEL;
4046 local->scan_channel_idx = 0;
4047 local->scan_band = IEEE80211_BAND_2GHZ;
4048 local->scan_dev = scan_sdata->dev;
4049
4050 netif_addr_lock_bh(local->mdev);
4051 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
4052 local->ops->configure_filter(local_to_hw(local),
4053 FIF_BCN_PRBRESP_PROMISC,
4054 &local->filter_flags,
4055 local->mdev->mc_count,
4056 local->mdev->mc_list);
4057 netif_addr_unlock_bh(local->mdev);
4058
4059 /* TODO: start scan as soon as all nullfunc frames are ACKed */
4060 queue_delayed_work(local->hw.workqueue, &local->scan_work,
4061 IEEE80211_CHANNEL_TIME);
4062
4063 return 0;
4064 }
4065
4066
4067 int ieee80211_sta_req_scan(struct ieee80211_sub_if_data *sdata, u8 *ssid, size_t ssid_len)
4068 {
4069 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4070 struct ieee80211_local *local = sdata->local;
4071
4072 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4073 return ieee80211_sta_start_scan(sdata, ssid, ssid_len);
4074
4075 if (local->sta_sw_scanning || local->sta_hw_scanning) {
4076 if (local->scan_dev == sdata->dev)
4077 return 0;
4078 return -EBUSY;
4079 }
4080
4081 ifsta->scan_ssid_len = ssid_len;
4082 if (ssid_len)
4083 memcpy(ifsta->scan_ssid, ssid, ssid_len);
4084 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
4085 queue_work(local->hw.workqueue, &ifsta->work);
4086 return 0;
4087 }
4088
4089 static char *
4090 ieee80211_sta_scan_result(struct ieee80211_local *local,
4091 struct iw_request_info *info,
4092 struct ieee80211_sta_bss *bss,
4093 char *current_ev, char *end_buf)
4094 {
4095 struct iw_event iwe;
4096
4097 if (time_after(jiffies,
4098 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
4099 return current_ev;
4100
4101 memset(&iwe, 0, sizeof(iwe));
4102 iwe.cmd = SIOCGIWAP;
4103 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
4104 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
4105 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4106 IW_EV_ADDR_LEN);
4107
4108 memset(&iwe, 0, sizeof(iwe));
4109 iwe.cmd = SIOCGIWESSID;
4110 if (bss_mesh_cfg(bss)) {
4111 iwe.u.data.length = bss_mesh_id_len(bss);
4112 iwe.u.data.flags = 1;
4113 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4114 &iwe, bss_mesh_id(bss));
4115 } else {
4116 iwe.u.data.length = bss->ssid_len;
4117 iwe.u.data.flags = 1;
4118 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4119 &iwe, bss->ssid);
4120 }
4121
4122 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
4123 || bss_mesh_cfg(bss)) {
4124 memset(&iwe, 0, sizeof(iwe));
4125 iwe.cmd = SIOCGIWMODE;
4126 if (bss_mesh_cfg(bss))
4127 iwe.u.mode = IW_MODE_MESH;
4128 else if (bss->capability & WLAN_CAPABILITY_ESS)
4129 iwe.u.mode = IW_MODE_MASTER;
4130 else
4131 iwe.u.mode = IW_MODE_ADHOC;
4132 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
4133 &iwe, IW_EV_UINT_LEN);
4134 }
4135
4136 memset(&iwe, 0, sizeof(iwe));
4137 iwe.cmd = SIOCGIWFREQ;
4138 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
4139 iwe.u.freq.e = 0;
4140 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4141 IW_EV_FREQ_LEN);
4142
4143 memset(&iwe, 0, sizeof(iwe));
4144 iwe.cmd = SIOCGIWFREQ;
4145 iwe.u.freq.m = bss->freq;
4146 iwe.u.freq.e = 6;
4147 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4148 IW_EV_FREQ_LEN);
4149 memset(&iwe, 0, sizeof(iwe));
4150 iwe.cmd = IWEVQUAL;
4151 iwe.u.qual.qual = bss->qual;
4152 iwe.u.qual.level = bss->signal;
4153 iwe.u.qual.noise = bss->noise;
4154 iwe.u.qual.updated = local->wstats_flags;
4155 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4156 IW_EV_QUAL_LEN);
4157
4158 memset(&iwe, 0, sizeof(iwe));
4159 iwe.cmd = SIOCGIWENCODE;
4160 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
4161 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
4162 else
4163 iwe.u.data.flags = IW_ENCODE_DISABLED;
4164 iwe.u.data.length = 0;
4165 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4166 &iwe, "");
4167
4168 if (bss && bss->wpa_ie) {
4169 memset(&iwe, 0, sizeof(iwe));
4170 iwe.cmd = IWEVGENIE;
4171 iwe.u.data.length = bss->wpa_ie_len;
4172 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4173 &iwe, bss->wpa_ie);
4174 }
4175
4176 if (bss && bss->rsn_ie) {
4177 memset(&iwe, 0, sizeof(iwe));
4178 iwe.cmd = IWEVGENIE;
4179 iwe.u.data.length = bss->rsn_ie_len;
4180 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4181 &iwe, bss->rsn_ie);
4182 }
4183
4184 if (bss && bss->ht_ie) {
4185 memset(&iwe, 0, sizeof(iwe));
4186 iwe.cmd = IWEVGENIE;
4187 iwe.u.data.length = bss->ht_ie_len;
4188 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4189 &iwe, bss->ht_ie);
4190 }
4191
4192 if (bss && bss->supp_rates_len > 0) {
4193 /* display all supported rates in readable format */
4194 char *p = current_ev + iwe_stream_lcp_len(info);
4195 int i;
4196
4197 memset(&iwe, 0, sizeof(iwe));
4198 iwe.cmd = SIOCGIWRATE;
4199 /* Those two flags are ignored... */
4200 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
4201
4202 for (i = 0; i < bss->supp_rates_len; i++) {
4203 iwe.u.bitrate.value = ((bss->supp_rates[i] &
4204 0x7f) * 500000);
4205 p = iwe_stream_add_value(info, current_ev, p,
4206 end_buf, &iwe, IW_EV_PARAM_LEN);
4207 }
4208 current_ev = p;
4209 }
4210
4211 if (bss) {
4212 char *buf;
4213 buf = kmalloc(30, GFP_ATOMIC);
4214 if (buf) {
4215 memset(&iwe, 0, sizeof(iwe));
4216 iwe.cmd = IWEVCUSTOM;
4217 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
4218 iwe.u.data.length = strlen(buf);
4219 current_ev = iwe_stream_add_point(info, current_ev,
4220 end_buf,
4221 &iwe, buf);
4222 memset(&iwe, 0, sizeof(iwe));
4223 iwe.cmd = IWEVCUSTOM;
4224 sprintf(buf, " Last beacon: %dms ago",
4225 jiffies_to_msecs(jiffies - bss->last_update));
4226 iwe.u.data.length = strlen(buf);
4227 current_ev = iwe_stream_add_point(info, current_ev,
4228 end_buf, &iwe, buf);
4229 kfree(buf);
4230 }
4231 }
4232
4233 if (bss_mesh_cfg(bss)) {
4234 char *buf;
4235 u8 *cfg = bss_mesh_cfg(bss);
4236 buf = kmalloc(50, GFP_ATOMIC);
4237 if (buf) {
4238 memset(&iwe, 0, sizeof(iwe));
4239 iwe.cmd = IWEVCUSTOM;
4240 sprintf(buf, "Mesh network (version %d)", cfg[0]);
4241 iwe.u.data.length = strlen(buf);
4242 current_ev = iwe_stream_add_point(info, current_ev,
4243 end_buf,
4244 &iwe, buf);
4245 sprintf(buf, "Path Selection Protocol ID: "
4246 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
4247 cfg[4]);
4248 iwe.u.data.length = strlen(buf);
4249 current_ev = iwe_stream_add_point(info, current_ev,
4250 end_buf,
4251 &iwe, buf);
4252 sprintf(buf, "Path Selection Metric ID: "
4253 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
4254 cfg[8]);
4255 iwe.u.data.length = strlen(buf);
4256 current_ev = iwe_stream_add_point(info, current_ev,
4257 end_buf,
4258 &iwe, buf);
4259 sprintf(buf, "Congestion Control Mode ID: "
4260 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
4261 cfg[11], cfg[12]);
4262 iwe.u.data.length = strlen(buf);
4263 current_ev = iwe_stream_add_point(info, current_ev,
4264 end_buf,
4265 &iwe, buf);
4266 sprintf(buf, "Channel Precedence: "
4267 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
4268 cfg[15], cfg[16]);
4269 iwe.u.data.length = strlen(buf);
4270 current_ev = iwe_stream_add_point(info, current_ev,
4271 end_buf,
4272 &iwe, buf);
4273 kfree(buf);
4274 }
4275 }
4276
4277 return current_ev;
4278 }
4279
4280
4281 int ieee80211_sta_scan_results(struct ieee80211_local *local,
4282 struct iw_request_info *info,
4283 char *buf, size_t len)
4284 {
4285 char *current_ev = buf;
4286 char *end_buf = buf + len;
4287 struct ieee80211_sta_bss *bss;
4288
4289 spin_lock_bh(&local->sta_bss_lock);
4290 list_for_each_entry(bss, &local->sta_bss_list, list) {
4291 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
4292 spin_unlock_bh(&local->sta_bss_lock);
4293 return -E2BIG;
4294 }
4295 current_ev = ieee80211_sta_scan_result(local, info, bss,
4296 current_ev, end_buf);
4297 }
4298 spin_unlock_bh(&local->sta_bss_lock);
4299 return current_ev - buf;
4300 }
4301
4302
4303 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
4304 {
4305 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4306
4307 kfree(ifsta->extra_ie);
4308 if (len == 0) {
4309 ifsta->extra_ie = NULL;
4310 ifsta->extra_ie_len = 0;
4311 return 0;
4312 }
4313 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
4314 if (!ifsta->extra_ie) {
4315 ifsta->extra_ie_len = 0;
4316 return -ENOMEM;
4317 }
4318 memcpy(ifsta->extra_ie, ie, len);
4319 ifsta->extra_ie_len = len;
4320 return 0;
4321 }
4322
4323
4324 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
4325 struct sk_buff *skb, u8 *bssid,
4326 u8 *addr, u64 supp_rates)
4327 {
4328 struct ieee80211_local *local = sdata->local;
4329 struct sta_info *sta;
4330 DECLARE_MAC_BUF(mac);
4331 int band = local->hw.conf.channel->band;
4332
4333 /* TODO: Could consider removing the least recently used entry and
4334 * allow new one to be added. */
4335 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
4336 if (net_ratelimit()) {
4337 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
4338 "entry %s\n", sdata->dev->name, print_mac(mac, addr));
4339 }
4340 return NULL;
4341 }
4342
4343 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
4344 return NULL;
4345
4346 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
4347 printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
4348 wiphy_name(local->hw.wiphy), print_mac(mac, addr), sdata->dev->name);
4349 #endif
4350
4351 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
4352 if (!sta)
4353 return NULL;
4354
4355 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
4356
4357 if (supp_rates)
4358 sta->supp_rates[band] = supp_rates;
4359 else
4360 sta->supp_rates[band] = sdata->u.sta.supp_rates_bits[band];
4361
4362 rate_control_rate_init(sta, local);
4363
4364 if (sta_info_insert(sta))
4365 return NULL;
4366
4367 return sta;
4368 }
4369
4370
4371 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
4372 {
4373 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4374
4375 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
4376 sdata->dev->name, reason);
4377
4378 if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
4379 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
4380 return -EINVAL;
4381
4382 ieee80211_send_deauth(sdata, ifsta, reason);
4383 ieee80211_set_disassoc(sdata, ifsta, 1);
4384 return 0;
4385 }
4386
4387
4388 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
4389 {
4390 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4391
4392 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
4393 sdata->dev->name, reason);
4394
4395 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4396 return -EINVAL;
4397
4398 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
4399 return -1;
4400
4401 ieee80211_send_disassoc(sdata, ifsta, reason);
4402 ieee80211_set_disassoc(sdata, ifsta, 0);
4403 return 0;
4404 }
4405
4406 void ieee80211_notify_mac(struct ieee80211_hw *hw,
4407 enum ieee80211_notification_types notif_type)
4408 {
4409 struct ieee80211_local *local = hw_to_local(hw);
4410 struct ieee80211_sub_if_data *sdata;
4411
4412 switch (notif_type) {
4413 case IEEE80211_NOTIFY_RE_ASSOC:
4414 rcu_read_lock();
4415 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4416 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4417 continue;
4418
4419 ieee80211_sta_req_auth(sdata, &sdata->u.sta);
4420 }
4421 rcu_read_unlock();
4422 break;
4423 }
4424 }
4425 EXPORT_SYMBOL(ieee80211_notify_mac);
Linux kernel - Deliverables
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