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mac80211: 11h Infrastructure - Parsing
[linux-2.6/libata-dev.git] / net / mac80211 / mlme.c
blob32453561fe326cb8e06e514c4b5b9faf7a4d31a6
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 net_device *dev, u8 *dst,
77 u8 *ssid, size_t ssid_len);
78 static struct ieee80211_sta_bss *
79 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int freq,
80 u8 *ssid, u8 ssid_len);
81 static void ieee80211_rx_bss_put(struct net_device *dev,
82 struct ieee80211_sta_bss *bss);
83 static int ieee80211_sta_find_ibss(struct net_device *dev,
84 struct ieee80211_if_sta *ifsta);
85 static int ieee80211_sta_wep_configured(struct net_device *dev);
86 static int ieee80211_sta_start_scan(struct net_device *dev,
87 u8 *ssid, size_t ssid_len);
88 static int ieee80211_sta_config_auth(struct net_device *dev,
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 net_device *dev,
243 struct ieee80211_sta_bss *bss,
244 int ibss)
245 {
246 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
247 struct ieee80211_local *local = sdata->local;
248 int i, have_higher_than_11mbit = 0;
249
250
251 /* cf. IEEE 802.11 9.2.12 */
252 for (i = 0; i < bss->supp_rates_len; i++)
253 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
254 have_higher_than_11mbit = 1;
255
256 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
257 have_higher_than_11mbit)
258 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
259 else
260 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
261
262
263 if (local->ops->conf_tx) {
264 struct ieee80211_tx_queue_params qparam;
265
266 memset(&qparam, 0, sizeof(qparam));
267
268 qparam.aifs = 2;
269
270 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
271 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
272 qparam.cw_min = 31;
273 else
274 qparam.cw_min = 15;
275
276 qparam.cw_max = 1023;
277 qparam.txop = 0;
278
279 for (i = 0; i < local_to_hw(local)->queues; i++)
280 local->ops->conf_tx(local_to_hw(local), i, &qparam);
281 }
282 }
283
284 static void ieee80211_sta_wmm_params(struct net_device *dev,
285 struct ieee80211_if_sta *ifsta,
286 u8 *wmm_param, size_t wmm_param_len)
287 {
288 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
289 struct ieee80211_tx_queue_params params;
290 size_t left;
291 int count;
292 u8 *pos;
293
294 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
295 return;
296
297 if (!wmm_param)
298 return;
299
300 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
301 return;
302 count = wmm_param[6] & 0x0f;
303 if (count == ifsta->wmm_last_param_set)
304 return;
305 ifsta->wmm_last_param_set = count;
306
307 pos = wmm_param + 8;
308 left = wmm_param_len - 8;
309
310 memset(&params, 0, sizeof(params));
311
312 if (!local->ops->conf_tx)
313 return;
314
315 local->wmm_acm = 0;
316 for (; left >= 4; left -= 4, pos += 4) {
317 int aci = (pos[0] >> 5) & 0x03;
318 int acm = (pos[0] >> 4) & 0x01;
319 int queue;
320
321 switch (aci) {
322 case 1:
323 queue = 3;
324 if (acm)
325 local->wmm_acm |= BIT(0) | BIT(3);
326 break;
327 case 2:
328 queue = 1;
329 if (acm)
330 local->wmm_acm |= BIT(4) | BIT(5);
331 break;
332 case 3:
333 queue = 0;
334 if (acm)
335 local->wmm_acm |= BIT(6) | BIT(7);
336 break;
337 case 0:
338 default:
339 queue = 2;
340 if (acm)
341 local->wmm_acm |= BIT(1) | BIT(2);
342 break;
343 }
344
345 params.aifs = pos[0] & 0x0f;
346 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
347 params.cw_min = ecw2cw(pos[1] & 0x0f);
348 params.txop = pos[2] | (pos[3] << 8);
349 #ifdef CONFIG_MAC80211_DEBUG
350 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
351 "cWmin=%d cWmax=%d txop=%d\n",
352 dev->name, queue, aci, acm, params.aifs, params.cw_min,
353 params.cw_max, params.txop);
354 #endif
355 /* TODO: handle ACM (block TX, fallback to next lowest allowed
356 * AC for now) */
357 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
358 printk(KERN_DEBUG "%s: failed to set TX queue "
359 "parameters for queue %d\n", dev->name, queue);
360 }
361 }
362 }
363
364 static u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
365 bool use_protection,
366 bool use_short_preamble)
367 {
368 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
369 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
370 DECLARE_MAC_BUF(mac);
371 u32 changed = 0;
372
373 if (use_protection != bss_conf->use_cts_prot) {
374 if (net_ratelimit()) {
375 printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
376 "%s)\n",
377 sdata->dev->name,
378 use_protection ? "enabled" : "disabled",
379 print_mac(mac, ifsta->bssid));
380 }
381 bss_conf->use_cts_prot = use_protection;
382 changed |= BSS_CHANGED_ERP_CTS_PROT;
383 }
384
385 if (use_short_preamble != bss_conf->use_short_preamble) {
386 if (net_ratelimit()) {
387 printk(KERN_DEBUG "%s: switched to %s barker preamble"
388 " (BSSID=%s)\n",
389 sdata->dev->name,
390 use_short_preamble ? "short" : "long",
391 print_mac(mac, ifsta->bssid));
392 }
393 bss_conf->use_short_preamble = use_short_preamble;
394 changed |= BSS_CHANGED_ERP_PREAMBLE;
395 }
396
397 return changed;
398 }
399
400 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
401 u8 erp_value)
402 {
403 bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
404 bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
405
406 return ieee80211_handle_protect_preamb(sdata,
407 use_protection, use_short_preamble);
408 }
409
410 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
411 struct ieee80211_sta_bss *bss)
412 {
413 u32 changed = 0;
414
415 if (bss->has_erp_value)
416 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
417 else {
418 u16 capab = bss->capability;
419 changed |= ieee80211_handle_protect_preamb(sdata, false,
420 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
421 }
422
423 return changed;
424 }
425
426 int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
427 struct ieee80211_ht_info *ht_info)
428 {
429
430 if (ht_info == NULL)
431 return -EINVAL;
432
433 memset(ht_info, 0, sizeof(*ht_info));
434
435 if (ht_cap_ie) {
436 u8 ampdu_info = ht_cap_ie->ampdu_params_info;
437
438 ht_info->ht_supported = 1;
439 ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
440 ht_info->ampdu_factor =
441 ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
442 ht_info->ampdu_density =
443 (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
444 memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
445 } else
446 ht_info->ht_supported = 0;
447
448 return 0;
449 }
450
451 int ieee80211_ht_addt_info_ie_to_ht_bss_info(
452 struct ieee80211_ht_addt_info *ht_add_info_ie,
453 struct ieee80211_ht_bss_info *bss_info)
454 {
455 if (bss_info == NULL)
456 return -EINVAL;
457
458 memset(bss_info, 0, sizeof(*bss_info));
459
460 if (ht_add_info_ie) {
461 u16 op_mode;
462 op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);
463
464 bss_info->primary_channel = ht_add_info_ie->control_chan;
465 bss_info->bss_cap = ht_add_info_ie->ht_param;
466 bss_info->bss_op_mode = (u8)(op_mode & 0xff);
467 }
468
469 return 0;
470 }
471
472 static void ieee80211_sta_send_associnfo(struct net_device *dev,
473 struct ieee80211_if_sta *ifsta)
474 {
475 char *buf;
476 size_t len;
477 int i;
478 union iwreq_data wrqu;
479
480 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
481 return;
482
483 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
484 ifsta->assocresp_ies_len), GFP_KERNEL);
485 if (!buf)
486 return;
487
488 len = sprintf(buf, "ASSOCINFO(");
489 if (ifsta->assocreq_ies) {
490 len += sprintf(buf + len, "ReqIEs=");
491 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
492 len += sprintf(buf + len, "%02x",
493 ifsta->assocreq_ies[i]);
494 }
495 }
496 if (ifsta->assocresp_ies) {
497 if (ifsta->assocreq_ies)
498 len += sprintf(buf + len, " ");
499 len += sprintf(buf + len, "RespIEs=");
500 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
501 len += sprintf(buf + len, "%02x",
502 ifsta->assocresp_ies[i]);
503 }
504 }
505 len += sprintf(buf + len, ")");
506
507 if (len > IW_CUSTOM_MAX) {
508 len = sprintf(buf, "ASSOCRESPIE=");
509 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
510 len += sprintf(buf + len, "%02x",
511 ifsta->assocresp_ies[i]);
512 }
513 }
514
515 memset(&wrqu, 0, sizeof(wrqu));
516 wrqu.data.length = len;
517 wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
518
519 kfree(buf);
520 }
521
522
523 static void ieee80211_set_associated(struct net_device *dev,
524 struct ieee80211_if_sta *ifsta,
525 bool assoc)
526 {
527 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
528 struct ieee80211_local *local = sdata->local;
529 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
530 union iwreq_data wrqu;
531 u32 changed = BSS_CHANGED_ASSOC;
532
533 if (assoc) {
534 struct ieee80211_sta_bss *bss;
535
536 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
537
538 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
539 return;
540
541 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
542 conf->channel->center_freq,
543 ifsta->ssid, ifsta->ssid_len);
544 if (bss) {
545 /* set timing information */
546 sdata->bss_conf.beacon_int = bss->beacon_int;
547 sdata->bss_conf.timestamp = bss->timestamp;
548
549 changed |= ieee80211_handle_bss_capability(sdata, bss);
550
551 ieee80211_rx_bss_put(dev, bss);
552 }
553
554 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
555 changed |= BSS_CHANGED_HT;
556 sdata->bss_conf.assoc_ht = 1;
557 sdata->bss_conf.ht_conf = &conf->ht_conf;
558 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
559 }
560
561 netif_carrier_on(dev);
562 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
563 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
564 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
565 ieee80211_sta_send_associnfo(dev, ifsta);
566 } else {
567 ieee80211_sta_tear_down_BA_sessions(dev, ifsta->bssid);
568 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
569 netif_carrier_off(dev);
570 ieee80211_reset_erp_info(dev);
571
572 sdata->bss_conf.assoc_ht = 0;
573 sdata->bss_conf.ht_conf = NULL;
574 sdata->bss_conf.ht_bss_conf = NULL;
575
576 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
577 }
578 ifsta->last_probe = jiffies;
579 ieee80211_led_assoc(local, assoc);
580
581 sdata->bss_conf.assoc = assoc;
582 ieee80211_bss_info_change_notify(sdata, changed);
583 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
584 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
585 }
586
587 static void ieee80211_set_disassoc(struct net_device *dev,
588 struct ieee80211_if_sta *ifsta, int deauth)
589 {
590 if (deauth)
591 ifsta->auth_tries = 0;
592 ifsta->assoc_tries = 0;
593 ieee80211_set_associated(dev, ifsta, 0);
594 }
595
596 void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
597 int encrypt)
598 {
599 struct ieee80211_sub_if_data *sdata;
600 struct ieee80211_tx_info *info;
601
602 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
603 skb->dev = sdata->local->mdev;
604 skb_set_mac_header(skb, 0);
605 skb_set_network_header(skb, 0);
606 skb_set_transport_header(skb, 0);
607
608 info = IEEE80211_SKB_CB(skb);
609 memset(info, 0, sizeof(struct ieee80211_tx_info));
610 info->control.ifindex = sdata->dev->ifindex;
611 if (!encrypt)
612 info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
613
614 dev_queue_xmit(skb);
615 }
616
617
618 static void ieee80211_send_auth(struct net_device *dev,
619 struct ieee80211_if_sta *ifsta,
620 int transaction, u8 *extra, size_t extra_len,
621 int encrypt)
622 {
623 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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", 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 = IEEE80211_FC(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, 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(dev, skb, encrypt);
653 }
654
655
656 static void ieee80211_authenticate(struct net_device *dev,
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 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 dev->name, print_mac(mac, ifsta->bssid));
673
674 ieee80211_send_auth(dev, 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 net_device *dev,
701 struct ieee80211_if_sta *ifsta)
702 {
703 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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", 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(dev, 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 ieee80211_rx_bss_put(dev, bss);
751 } else {
752 rates = ~0;
753 rates_len = sband->n_bitrates;
754 }
755
756 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
757 memset(mgmt, 0, 24);
758 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
759 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
760 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
761
762 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
763 skb_put(skb, 10);
764 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
765 IEEE80211_STYPE_REASSOC_REQ);
766 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
767 mgmt->u.reassoc_req.listen_interval = cpu_to_le16(1);
768 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
769 ETH_ALEN);
770 } else {
771 skb_put(skb, 4);
772 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
773 IEEE80211_STYPE_ASSOC_REQ);
774 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
775 mgmt->u.assoc_req.listen_interval = cpu_to_le16(1);
776 }
777
778 /* SSID */
779 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
780 *pos++ = WLAN_EID_SSID;
781 *pos++ = ifsta->ssid_len;
782 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
783
784 /* add all rates which were marked to be used above */
785 supp_rates_len = rates_len;
786 if (supp_rates_len > 8)
787 supp_rates_len = 8;
788
789 len = sband->n_bitrates;
790 pos = skb_put(skb, supp_rates_len + 2);
791 *pos++ = WLAN_EID_SUPP_RATES;
792 *pos++ = supp_rates_len;
793
794 count = 0;
795 for (i = 0; i < sband->n_bitrates; i++) {
796 if (BIT(i) & rates) {
797 int rate = sband->bitrates[i].bitrate;
798 *pos++ = (u8) (rate / 5);
799 if (++count == 8)
800 break;
801 }
802 }
803
804 if (count == 8) {
805 pos = skb_put(skb, rates_len - count + 2);
806 *pos++ = WLAN_EID_EXT_SUPP_RATES;
807 *pos++ = rates_len - count;
808
809 for (i++; i < sband->n_bitrates; i++) {
810 if (BIT(i) & rates) {
811 int rate = sband->bitrates[i].bitrate;
812 *pos++ = (u8) (rate / 5);
813 }
814 }
815 }
816
817 if (ifsta->extra_ie) {
818 pos = skb_put(skb, ifsta->extra_ie_len);
819 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
820 }
821
822 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
823 pos = skb_put(skb, 9);
824 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
825 *pos++ = 7; /* len */
826 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
827 *pos++ = 0x50;
828 *pos++ = 0xf2;
829 *pos++ = 2; /* WME */
830 *pos++ = 0; /* WME info */
831 *pos++ = 1; /* WME ver */
832 *pos++ = 0;
833 }
834
835 /* wmm support is a must to HT */
836 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
837 sband->ht_info.ht_supported && bss->ht_add_ie) {
838 struct ieee80211_ht_addt_info *ht_add_info =
839 (struct ieee80211_ht_addt_info *)bss->ht_add_ie;
840 u16 cap = sband->ht_info.cap;
841 __le16 tmp;
842 u32 flags = local->hw.conf.channel->flags;
843
844 switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
845 case IEEE80211_HT_IE_CHA_SEC_ABOVE:
846 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
847 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
848 cap &= ~IEEE80211_HT_CAP_SGI_40;
849 }
850 break;
851 case IEEE80211_HT_IE_CHA_SEC_BELOW:
852 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
853 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
854 cap &= ~IEEE80211_HT_CAP_SGI_40;
855 }
856 break;
857 }
858
859 tmp = cpu_to_le16(cap);
860 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
861 *pos++ = WLAN_EID_HT_CAPABILITY;
862 *pos++ = sizeof(struct ieee80211_ht_cap);
863 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
864 memcpy(pos, &tmp, sizeof(u16));
865 pos += sizeof(u16);
866 /* TODO: needs a define here for << 2 */
867 *pos++ = sband->ht_info.ampdu_factor |
868 (sband->ht_info.ampdu_density << 2);
869 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
870 }
871
872 kfree(ifsta->assocreq_ies);
873 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
874 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
875 if (ifsta->assocreq_ies)
876 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
877
878 ieee80211_sta_tx(dev, skb, 0);
879 }
880
881
882 static void ieee80211_send_deauth(struct net_device *dev,
883 struct ieee80211_if_sta *ifsta, u16 reason)
884 {
885 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
886 struct sk_buff *skb;
887 struct ieee80211_mgmt *mgmt;
888
889 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
890 if (!skb) {
891 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
892 "frame\n", dev->name);
893 return;
894 }
895 skb_reserve(skb, local->hw.extra_tx_headroom);
896
897 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
898 memset(mgmt, 0, 24);
899 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
900 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
901 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
902 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
903 IEEE80211_STYPE_DEAUTH);
904 skb_put(skb, 2);
905 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
906
907 ieee80211_sta_tx(dev, skb, 0);
908 }
909
910
911 static void ieee80211_send_disassoc(struct net_device *dev,
912 struct ieee80211_if_sta *ifsta, u16 reason)
913 {
914 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
915 struct sk_buff *skb;
916 struct ieee80211_mgmt *mgmt;
917
918 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
919 if (!skb) {
920 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
921 "frame\n", dev->name);
922 return;
923 }
924 skb_reserve(skb, local->hw.extra_tx_headroom);
925
926 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
927 memset(mgmt, 0, 24);
928 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
929 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
930 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
931 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
932 IEEE80211_STYPE_DISASSOC);
933 skb_put(skb, 2);
934 mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
935
936 ieee80211_sta_tx(dev, skb, 0);
937 }
938
939
940 static int ieee80211_privacy_mismatch(struct net_device *dev,
941 struct ieee80211_if_sta *ifsta)
942 {
943 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
944 struct ieee80211_sta_bss *bss;
945 int bss_privacy;
946 int wep_privacy;
947 int privacy_invoked;
948
949 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
950 return 0;
951
952 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
953 local->hw.conf.channel->center_freq,
954 ifsta->ssid, ifsta->ssid_len);
955 if (!bss)
956 return 0;
957
958 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
959 wep_privacy = !!ieee80211_sta_wep_configured(dev);
960 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
961
962 ieee80211_rx_bss_put(dev, bss);
963
964 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
965 return 0;
966
967 return 1;
968 }
969
970
971 static void ieee80211_associate(struct net_device *dev,
972 struct ieee80211_if_sta *ifsta)
973 {
974 DECLARE_MAC_BUF(mac);
975
976 ifsta->assoc_tries++;
977 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
978 printk(KERN_DEBUG "%s: association with AP %s"
979 " timed out\n",
980 dev->name, print_mac(mac, ifsta->bssid));
981 ifsta->state = IEEE80211_DISABLED;
982 return;
983 }
984
985 ifsta->state = IEEE80211_ASSOCIATE;
986 printk(KERN_DEBUG "%s: associate with AP %s\n",
987 dev->name, print_mac(mac, ifsta->bssid));
988 if (ieee80211_privacy_mismatch(dev, ifsta)) {
989 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
990 "mixed-cell disabled - abort association\n", dev->name);
991 ifsta->state = IEEE80211_DISABLED;
992 return;
993 }
994
995 ieee80211_send_assoc(dev, ifsta);
996
997 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
998 }
999
1000
1001 static void ieee80211_associated(struct net_device *dev,
1002 struct ieee80211_if_sta *ifsta)
1003 {
1004 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1005 struct sta_info *sta;
1006 int disassoc;
1007 DECLARE_MAC_BUF(mac);
1008
1009 /* TODO: start monitoring current AP signal quality and number of
1010 * missed beacons. Scan other channels every now and then and search
1011 * for better APs. */
1012 /* TODO: remove expired BSSes */
1013
1014 ifsta->state = IEEE80211_ASSOCIATED;
1015
1016 rcu_read_lock();
1017
1018 sta = sta_info_get(local, ifsta->bssid);
1019 if (!sta) {
1020 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
1021 dev->name, print_mac(mac, ifsta->bssid));
1022 disassoc = 1;
1023 } else {
1024 disassoc = 0;
1025 if (time_after(jiffies,
1026 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1027 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1028 printk(KERN_DEBUG "%s: No ProbeResp from "
1029 "current AP %s - assume out of "
1030 "range\n",
1031 dev->name, print_mac(mac, ifsta->bssid));
1032 disassoc = 1;
1033 sta_info_unlink(&sta);
1034 } else
1035 ieee80211_send_probe_req(dev, ifsta->bssid,
1036 local->scan_ssid,
1037 local->scan_ssid_len);
1038 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1039 } else {
1040 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1041 if (time_after(jiffies, ifsta->last_probe +
1042 IEEE80211_PROBE_INTERVAL)) {
1043 ifsta->last_probe = jiffies;
1044 ieee80211_send_probe_req(dev, ifsta->bssid,
1045 ifsta->ssid,
1046 ifsta->ssid_len);
1047 }
1048 }
1049 }
1050
1051 rcu_read_unlock();
1052
1053 if (disassoc && sta)
1054 sta_info_destroy(sta);
1055
1056 if (disassoc) {
1057 ifsta->state = IEEE80211_DISABLED;
1058 ieee80211_set_associated(dev, ifsta, 0);
1059 } else {
1060 mod_timer(&ifsta->timer, jiffies +
1061 IEEE80211_MONITORING_INTERVAL);
1062 }
1063 }
1064
1065
1066 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
1067 u8 *ssid, size_t ssid_len)
1068 {
1069 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1070 struct ieee80211_supported_band *sband;
1071 struct sk_buff *skb;
1072 struct ieee80211_mgmt *mgmt;
1073 u8 *pos, *supp_rates, *esupp_rates = NULL;
1074 int i;
1075
1076 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
1077 if (!skb) {
1078 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1079 "request\n", dev->name);
1080 return;
1081 }
1082 skb_reserve(skb, local->hw.extra_tx_headroom);
1083
1084 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1085 memset(mgmt, 0, 24);
1086 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1087 IEEE80211_STYPE_PROBE_REQ);
1088 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1089 if (dst) {
1090 memcpy(mgmt->da, dst, ETH_ALEN);
1091 memcpy(mgmt->bssid, dst, ETH_ALEN);
1092 } else {
1093 memset(mgmt->da, 0xff, ETH_ALEN);
1094 memset(mgmt->bssid, 0xff, ETH_ALEN);
1095 }
1096 pos = skb_put(skb, 2 + ssid_len);
1097 *pos++ = WLAN_EID_SSID;
1098 *pos++ = ssid_len;
1099 memcpy(pos, ssid, ssid_len);
1100
1101 supp_rates = skb_put(skb, 2);
1102 supp_rates[0] = WLAN_EID_SUPP_RATES;
1103 supp_rates[1] = 0;
1104 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1105
1106 for (i = 0; i < sband->n_bitrates; i++) {
1107 struct ieee80211_rate *rate = &sband->bitrates[i];
1108 if (esupp_rates) {
1109 pos = skb_put(skb, 1);
1110 esupp_rates[1]++;
1111 } else if (supp_rates[1] == 8) {
1112 esupp_rates = skb_put(skb, 3);
1113 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
1114 esupp_rates[1] = 1;
1115 pos = &esupp_rates[2];
1116 } else {
1117 pos = skb_put(skb, 1);
1118 supp_rates[1]++;
1119 }
1120 *pos = rate->bitrate / 5;
1121 }
1122
1123 ieee80211_sta_tx(dev, skb, 0);
1124 }
1125
1126
1127 static int ieee80211_sta_wep_configured(struct net_device *dev)
1128 {
1129 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1130 if (!sdata || !sdata->default_key ||
1131 sdata->default_key->conf.alg != ALG_WEP)
1132 return 0;
1133 return 1;
1134 }
1135
1136
1137 static void ieee80211_auth_completed(struct net_device *dev,
1138 struct ieee80211_if_sta *ifsta)
1139 {
1140 printk(KERN_DEBUG "%s: authenticated\n", dev->name);
1141 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1142 ieee80211_associate(dev, ifsta);
1143 }
1144
1145
1146 static void ieee80211_auth_challenge(struct net_device *dev,
1147 struct ieee80211_if_sta *ifsta,
1148 struct ieee80211_mgmt *mgmt,
1149 size_t len)
1150 {
1151 u8 *pos;
1152 struct ieee802_11_elems elems;
1153
1154 printk(KERN_DEBUG "%s: replying to auth challenge\n", dev->name);
1155 pos = mgmt->u.auth.variable;
1156 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1157 if (!elems.challenge) {
1158 printk(KERN_DEBUG "%s: no challenge IE in shared key auth "
1159 "frame\n", dev->name);
1160 return;
1161 }
1162 ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
1163 elems.challenge_len + 2, 1);
1164 }
1165
1166 static void ieee80211_send_addba_resp(struct net_device *dev, u8 *da, u16 tid,
1167 u8 dialog_token, u16 status, u16 policy,
1168 u16 buf_size, u16 timeout)
1169 {
1170 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1171 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1172 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1173 struct sk_buff *skb;
1174 struct ieee80211_mgmt *mgmt;
1175 u16 capab;
1176
1177 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1178
1179 if (!skb) {
1180 printk(KERN_DEBUG "%s: failed to allocate buffer "
1181 "for addba resp frame\n", dev->name);
1182 return;
1183 }
1184
1185 skb_reserve(skb, local->hw.extra_tx_headroom);
1186 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1187 memset(mgmt, 0, 24);
1188 memcpy(mgmt->da, da, ETH_ALEN);
1189 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1190 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1191 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1192 else
1193 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1194 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1195 IEEE80211_STYPE_ACTION);
1196
1197 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
1198 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1199 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
1200 mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
1201
1202 capab = (u16)(policy << 1); /* bit 1 aggregation policy */
1203 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1204 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
1205
1206 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
1207 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
1208 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
1209
1210 ieee80211_sta_tx(dev, skb, 0);
1211
1212 return;
1213 }
1214
1215 void ieee80211_send_addba_request(struct net_device *dev, const u8 *da,
1216 u16 tid, u8 dialog_token, u16 start_seq_num,
1217 u16 agg_size, u16 timeout)
1218 {
1219 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1220 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1221 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1222 struct sk_buff *skb;
1223 struct ieee80211_mgmt *mgmt;
1224 u16 capab;
1225
1226 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1227
1228 if (!skb) {
1229 printk(KERN_ERR "%s: failed to allocate buffer "
1230 "for addba request frame\n", dev->name);
1231 return;
1232 }
1233 skb_reserve(skb, local->hw.extra_tx_headroom);
1234 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1235 memset(mgmt, 0, 24);
1236 memcpy(mgmt->da, da, ETH_ALEN);
1237 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1238 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1239 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1240 else
1241 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1242
1243 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1244 IEEE80211_STYPE_ACTION);
1245
1246 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
1247
1248 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1249 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
1250
1251 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
1252 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
1253 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1254 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
1255
1256 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
1257
1258 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
1259 mgmt->u.action.u.addba_req.start_seq_num =
1260 cpu_to_le16(start_seq_num << 4);
1261
1262 ieee80211_sta_tx(dev, skb, 0);
1263 }
1264
1265 static void ieee80211_sta_process_addba_request(struct net_device *dev,
1266 struct ieee80211_mgmt *mgmt,
1267 size_t len)
1268 {
1269 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1270 struct ieee80211_hw *hw = &local->hw;
1271 struct ieee80211_conf *conf = &hw->conf;
1272 struct sta_info *sta;
1273 struct tid_ampdu_rx *tid_agg_rx;
1274 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
1275 u8 dialog_token;
1276 int ret = -EOPNOTSUPP;
1277 DECLARE_MAC_BUF(mac);
1278
1279 rcu_read_lock();
1280
1281 sta = sta_info_get(local, mgmt->sa);
1282 if (!sta) {
1283 rcu_read_unlock();
1284 return;
1285 }
1286
1287 /* extract session parameters from addba request frame */
1288 dialog_token = mgmt->u.action.u.addba_req.dialog_token;
1289 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
1290 start_seq_num =
1291 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
1292
1293 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
1294 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
1295 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1296 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
1297
1298 status = WLAN_STATUS_REQUEST_DECLINED;
1299
1300 /* sanity check for incoming parameters:
1301 * check if configuration can support the BA policy
1302 * and if buffer size does not exceeds max value */
1303 if (((ba_policy != 1)
1304 && (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA)))
1305 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
1306 status = WLAN_STATUS_INVALID_QOS_PARAM;
1307 #ifdef CONFIG_MAC80211_HT_DEBUG
1308 if (net_ratelimit())
1309 printk(KERN_DEBUG "AddBA Req with bad params from "
1310 "%s on tid %u. policy %d, buffer size %d\n",
1311 print_mac(mac, mgmt->sa), tid, ba_policy,
1312 buf_size);
1313 #endif /* CONFIG_MAC80211_HT_DEBUG */
1314 goto end_no_lock;
1315 }
1316 /* determine default buffer size */
1317 if (buf_size == 0) {
1318 struct ieee80211_supported_band *sband;
1319
1320 sband = local->hw.wiphy->bands[conf->channel->band];
1321 buf_size = IEEE80211_MIN_AMPDU_BUF;
1322 buf_size = buf_size << sband->ht_info.ampdu_factor;
1323 }
1324
1325
1326 /* examine state machine */
1327 spin_lock_bh(&sta->lock);
1328
1329 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
1330 #ifdef CONFIG_MAC80211_HT_DEBUG
1331 if (net_ratelimit())
1332 printk(KERN_DEBUG "unexpected AddBA Req from "
1333 "%s on tid %u\n",
1334 print_mac(mac, mgmt->sa), tid);
1335 #endif /* CONFIG_MAC80211_HT_DEBUG */
1336 goto end;
1337 }
1338
1339 /* prepare A-MPDU MLME for Rx aggregation */
1340 sta->ampdu_mlme.tid_rx[tid] =
1341 kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
1342 if (!sta->ampdu_mlme.tid_rx[tid]) {
1343 if (net_ratelimit())
1344 printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
1345 tid);
1346 goto end;
1347 }
1348 /* rx timer */
1349 sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
1350 sta_rx_agg_session_timer_expired;
1351 sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
1352 (unsigned long)&sta->timer_to_tid[tid];
1353 init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1354
1355 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
1356
1357 /* prepare reordering buffer */
1358 tid_agg_rx->reorder_buf =
1359 kmalloc(buf_size * sizeof(struct sk_buff *), GFP_ATOMIC);
1360 if (!tid_agg_rx->reorder_buf) {
1361 if (net_ratelimit())
1362 printk(KERN_ERR "can not allocate reordering buffer "
1363 "to tid %d\n", tid);
1364 kfree(sta->ampdu_mlme.tid_rx[tid]);
1365 goto end;
1366 }
1367 memset(tid_agg_rx->reorder_buf, 0,
1368 buf_size * sizeof(struct sk_buff *));
1369
1370 if (local->ops->ampdu_action)
1371 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
1372 sta->addr, tid, &start_seq_num);
1373 #ifdef CONFIG_MAC80211_HT_DEBUG
1374 printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
1375 #endif /* CONFIG_MAC80211_HT_DEBUG */
1376
1377 if (ret) {
1378 kfree(tid_agg_rx->reorder_buf);
1379 kfree(tid_agg_rx);
1380 sta->ampdu_mlme.tid_rx[tid] = NULL;
1381 goto end;
1382 }
1383
1384 /* change state and send addba resp */
1385 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
1386 tid_agg_rx->dialog_token = dialog_token;
1387 tid_agg_rx->ssn = start_seq_num;
1388 tid_agg_rx->head_seq_num = start_seq_num;
1389 tid_agg_rx->buf_size = buf_size;
1390 tid_agg_rx->timeout = timeout;
1391 tid_agg_rx->stored_mpdu_num = 0;
1392 status = WLAN_STATUS_SUCCESS;
1393 end:
1394 spin_unlock_bh(&sta->lock);
1395
1396 end_no_lock:
1397 ieee80211_send_addba_resp(sta->sdata->dev, sta->addr, tid,
1398 dialog_token, status, 1, buf_size, timeout);
1399 rcu_read_unlock();
1400 }
1401
1402 static void ieee80211_sta_process_addba_resp(struct net_device *dev,
1403 struct ieee80211_mgmt *mgmt,
1404 size_t len)
1405 {
1406 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1407 struct ieee80211_hw *hw = &local->hw;
1408 struct sta_info *sta;
1409 u16 capab;
1410 u16 tid;
1411 u8 *state;
1412
1413 rcu_read_lock();
1414
1415 sta = sta_info_get(local, mgmt->sa);
1416 if (!sta) {
1417 rcu_read_unlock();
1418 return;
1419 }
1420
1421 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
1422 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1423
1424 state = &sta->ampdu_mlme.tid_state_tx[tid];
1425
1426 spin_lock_bh(&sta->lock);
1427
1428 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1429 spin_unlock_bh(&sta->lock);
1430 printk(KERN_DEBUG "state not HT_ADDBA_REQUESTED_MSK:"
1431 "%d\n", *state);
1432 goto addba_resp_exit;
1433 }
1434
1435 if (mgmt->u.action.u.addba_resp.dialog_token !=
1436 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
1437 spin_unlock_bh(&sta->lock);
1438 #ifdef CONFIG_MAC80211_HT_DEBUG
1439 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
1440 #endif /* CONFIG_MAC80211_HT_DEBUG */
1441 goto addba_resp_exit;
1442 }
1443
1444 del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
1445 #ifdef CONFIG_MAC80211_HT_DEBUG
1446 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
1447 #endif /* CONFIG_MAC80211_HT_DEBUG */
1448 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
1449 == WLAN_STATUS_SUCCESS) {
1450 if (*state & HT_ADDBA_RECEIVED_MSK)
1451 printk(KERN_DEBUG "double addBA response\n");
1452
1453 *state |= HT_ADDBA_RECEIVED_MSK;
1454 sta->ampdu_mlme.addba_req_num[tid] = 0;
1455
1456 if (*state == HT_AGG_STATE_OPERATIONAL) {
1457 printk(KERN_DEBUG "Aggregation on for tid %d \n", tid);
1458 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
1459 }
1460
1461 spin_unlock_bh(&sta->lock);
1462 printk(KERN_DEBUG "recipient accepted agg: tid %d \n", tid);
1463 } else {
1464 printk(KERN_DEBUG "recipient rejected agg: tid %d \n", tid);
1465
1466 sta->ampdu_mlme.addba_req_num[tid]++;
1467 /* this will allow the state check in stop_BA_session */
1468 *state = HT_AGG_STATE_OPERATIONAL;
1469 spin_unlock_bh(&sta->lock);
1470 ieee80211_stop_tx_ba_session(hw, sta->addr, tid,
1471 WLAN_BACK_INITIATOR);
1472 }
1473
1474 addba_resp_exit:
1475 rcu_read_unlock();
1476 }
1477
1478 void ieee80211_send_delba(struct net_device *dev, const u8 *da, u16 tid,
1479 u16 initiator, u16 reason_code)
1480 {
1481 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1482 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1483 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1484 struct sk_buff *skb;
1485 struct ieee80211_mgmt *mgmt;
1486 u16 params;
1487
1488 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1489
1490 if (!skb) {
1491 printk(KERN_ERR "%s: failed to allocate buffer "
1492 "for delba frame\n", dev->name);
1493 return;
1494 }
1495
1496 skb_reserve(skb, local->hw.extra_tx_headroom);
1497 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1498 memset(mgmt, 0, 24);
1499 memcpy(mgmt->da, da, ETH_ALEN);
1500 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1501 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1502 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1503 else
1504 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1505 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1506 IEEE80211_STYPE_ACTION);
1507
1508 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
1509
1510 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1511 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
1512 params = (u16)(initiator << 11); /* bit 11 initiator */
1513 params |= (u16)(tid << 12); /* bit 15:12 TID number */
1514
1515 mgmt->u.action.u.delba.params = cpu_to_le16(params);
1516 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
1517
1518 ieee80211_sta_tx(dev, skb, 0);
1519 }
1520
1521 void ieee80211_sta_stop_rx_ba_session(struct net_device *dev, u8 *ra, u16 tid,
1522 u16 initiator, u16 reason)
1523 {
1524 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1525 struct ieee80211_hw *hw = &local->hw;
1526 struct sta_info *sta;
1527 int ret, i;
1528 DECLARE_MAC_BUF(mac);
1529
1530 rcu_read_lock();
1531
1532 sta = sta_info_get(local, ra);
1533 if (!sta) {
1534 rcu_read_unlock();
1535 return;
1536 }
1537
1538 /* check if TID is in operational state */
1539 spin_lock_bh(&sta->lock);
1540 if (sta->ampdu_mlme.tid_state_rx[tid]
1541 != HT_AGG_STATE_OPERATIONAL) {
1542 spin_unlock_bh(&sta->lock);
1543 rcu_read_unlock();
1544 return;
1545 }
1546 sta->ampdu_mlme.tid_state_rx[tid] =
1547 HT_AGG_STATE_REQ_STOP_BA_MSK |
1548 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
1549 spin_unlock_bh(&sta->lock);
1550
1551 /* stop HW Rx aggregation. ampdu_action existence
1552 * already verified in session init so we add the BUG_ON */
1553 BUG_ON(!local->ops->ampdu_action);
1554
1555 #ifdef CONFIG_MAC80211_HT_DEBUG
1556 printk(KERN_DEBUG "Rx BA session stop requested for %s tid %u\n",
1557 print_mac(mac, ra), tid);
1558 #endif /* CONFIG_MAC80211_HT_DEBUG */
1559
1560 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
1561 ra, tid, NULL);
1562 if (ret)
1563 printk(KERN_DEBUG "HW problem - can not stop rx "
1564 "aggergation for tid %d\n", tid);
1565
1566 /* shutdown timer has not expired */
1567 if (initiator != WLAN_BACK_TIMER)
1568 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1569
1570 /* check if this is a self generated aggregation halt */
1571 if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
1572 ieee80211_send_delba(dev, ra, tid, 0, reason);
1573
1574 /* free the reordering buffer */
1575 for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
1576 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
1577 /* release the reordered frames */
1578 dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
1579 sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
1580 sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
1581 }
1582 }
1583 /* free resources */
1584 kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
1585 kfree(sta->ampdu_mlme.tid_rx[tid]);
1586 sta->ampdu_mlme.tid_rx[tid] = NULL;
1587 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
1588
1589 rcu_read_unlock();
1590 }
1591
1592
1593 static void ieee80211_sta_process_delba(struct net_device *dev,
1594 struct ieee80211_mgmt *mgmt, size_t len)
1595 {
1596 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1597 struct sta_info *sta;
1598 u16 tid, params;
1599 u16 initiator;
1600 DECLARE_MAC_BUF(mac);
1601
1602 rcu_read_lock();
1603
1604 sta = sta_info_get(local, mgmt->sa);
1605 if (!sta) {
1606 rcu_read_unlock();
1607 return;
1608 }
1609
1610 params = le16_to_cpu(mgmt->u.action.u.delba.params);
1611 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
1612 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
1613
1614 #ifdef CONFIG_MAC80211_HT_DEBUG
1615 if (net_ratelimit())
1616 printk(KERN_DEBUG "delba from %s (%s) tid %d reason code %d\n",
1617 print_mac(mac, mgmt->sa),
1618 initiator ? "initiator" : "recipient", tid,
1619 mgmt->u.action.u.delba.reason_code);
1620 #endif /* CONFIG_MAC80211_HT_DEBUG */
1621
1622 if (initiator == WLAN_BACK_INITIATOR)
1623 ieee80211_sta_stop_rx_ba_session(dev, sta->addr, tid,
1624 WLAN_BACK_INITIATOR, 0);
1625 else { /* WLAN_BACK_RECIPIENT */
1626 spin_lock_bh(&sta->lock);
1627 sta->ampdu_mlme.tid_state_tx[tid] =
1628 HT_AGG_STATE_OPERATIONAL;
1629 spin_unlock_bh(&sta->lock);
1630 ieee80211_stop_tx_ba_session(&local->hw, sta->addr, tid,
1631 WLAN_BACK_RECIPIENT);
1632 }
1633 rcu_read_unlock();
1634 }
1635
1636 /*
1637 * After sending add Block Ack request we activated a timer until
1638 * add Block Ack response will arrive from the recipient.
1639 * If this timer expires sta_addba_resp_timer_expired will be executed.
1640 */
1641 void sta_addba_resp_timer_expired(unsigned long data)
1642 {
1643 /* not an elegant detour, but there is no choice as the timer passes
1644 * only one argument, and both sta_info and TID are needed, so init
1645 * flow in sta_info_create gives the TID as data, while the timer_to_id
1646 * array gives the sta through container_of */
1647 u16 tid = *(u8 *)data;
1648 struct sta_info *temp_sta = container_of((void *)data,
1649 struct sta_info, timer_to_tid[tid]);
1650
1651 struct ieee80211_local *local = temp_sta->local;
1652 struct ieee80211_hw *hw = &local->hw;
1653 struct sta_info *sta;
1654 u8 *state;
1655
1656 rcu_read_lock();
1657
1658 sta = sta_info_get(local, temp_sta->addr);
1659 if (!sta) {
1660 rcu_read_unlock();
1661 return;
1662 }
1663
1664 state = &sta->ampdu_mlme.tid_state_tx[tid];
1665 /* check if the TID waits for addBA response */
1666 spin_lock_bh(&sta->lock);
1667 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1668 spin_unlock_bh(&sta->lock);
1669 *state = HT_AGG_STATE_IDLE;
1670 printk(KERN_DEBUG "timer expired on tid %d but we are not "
1671 "expecting addBA response there", tid);
1672 goto timer_expired_exit;
1673 }
1674
1675 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
1676
1677 /* go through the state check in stop_BA_session */
1678 *state = HT_AGG_STATE_OPERATIONAL;
1679 spin_unlock_bh(&sta->lock);
1680 ieee80211_stop_tx_ba_session(hw, temp_sta->addr, tid,
1681 WLAN_BACK_INITIATOR);
1682
1683 timer_expired_exit:
1684 rcu_read_unlock();
1685 }
1686
1687 /*
1688 * After accepting the AddBA Request we activated a timer,
1689 * resetting it after each frame that arrives from the originator.
1690 * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
1691 */
1692 static void sta_rx_agg_session_timer_expired(unsigned long data)
1693 {
1694 /* not an elegant detour, but there is no choice as the timer passes
1695 * only one argument, and various sta_info are needed here, so init
1696 * flow in sta_info_create gives the TID as data, while the timer_to_id
1697 * array gives the sta through container_of */
1698 u8 *ptid = (u8 *)data;
1699 u8 *timer_to_id = ptid - *ptid;
1700 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
1701 timer_to_tid[0]);
1702
1703 printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
1704 ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr,
1705 (u16)*ptid, WLAN_BACK_TIMER,
1706 WLAN_REASON_QSTA_TIMEOUT);
1707 }
1708
1709 void ieee80211_sta_tear_down_BA_sessions(struct net_device *dev, u8 *addr)
1710 {
1711 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1712 int i;
1713
1714 for (i = 0; i < STA_TID_NUM; i++) {
1715 ieee80211_stop_tx_ba_session(&local->hw, addr, i,
1716 WLAN_BACK_INITIATOR);
1717 ieee80211_sta_stop_rx_ba_session(dev, addr, i,
1718 WLAN_BACK_RECIPIENT,
1719 WLAN_REASON_QSTA_LEAVE_QBSS);
1720 }
1721 }
1722
1723 static void ieee80211_rx_mgmt_auth(struct net_device *dev,
1724 struct ieee80211_if_sta *ifsta,
1725 struct ieee80211_mgmt *mgmt,
1726 size_t len)
1727 {
1728 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1729 u16 auth_alg, auth_transaction, status_code;
1730 DECLARE_MAC_BUF(mac);
1731
1732 if (ifsta->state != IEEE80211_AUTHENTICATE &&
1733 sdata->vif.type != IEEE80211_IF_TYPE_IBSS) {
1734 printk(KERN_DEBUG "%s: authentication frame received from "
1735 "%s, but not in authenticate state - ignored\n",
1736 dev->name, print_mac(mac, mgmt->sa));
1737 return;
1738 }
1739
1740 if (len < 24 + 6) {
1741 printk(KERN_DEBUG "%s: too short (%zd) authentication frame "
1742 "received from %s - ignored\n",
1743 dev->name, len, print_mac(mac, mgmt->sa));
1744 return;
1745 }
1746
1747 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1748 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1749 printk(KERN_DEBUG "%s: authentication frame received from "
1750 "unknown AP (SA=%s BSSID=%s) - "
1751 "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1752 print_mac(mac, mgmt->bssid));
1753 return;
1754 }
1755
1756 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1757 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) {
1758 printk(KERN_DEBUG "%s: authentication frame received from "
1759 "unknown BSSID (SA=%s BSSID=%s) - "
1760 "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1761 print_mac(mac, mgmt->bssid));
1762 return;
1763 }
1764
1765 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1766 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1767 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1768
1769 printk(KERN_DEBUG "%s: RX authentication from %s (alg=%d "
1770 "transaction=%d status=%d)\n",
1771 dev->name, print_mac(mac, mgmt->sa), auth_alg,
1772 auth_transaction, status_code);
1773
1774 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1775 /* IEEE 802.11 standard does not require authentication in IBSS
1776 * networks and most implementations do not seem to use it.
1777 * However, try to reply to authentication attempts if someone
1778 * has actually implemented this.
1779 * TODO: Could implement shared key authentication. */
1780 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) {
1781 printk(KERN_DEBUG "%s: unexpected IBSS authentication "
1782 "frame (alg=%d transaction=%d)\n",
1783 dev->name, auth_alg, auth_transaction);
1784 return;
1785 }
1786 ieee80211_send_auth(dev, ifsta, 2, NULL, 0, 0);
1787 }
1788
1789 if (auth_alg != ifsta->auth_alg ||
1790 auth_transaction != ifsta->auth_transaction) {
1791 printk(KERN_DEBUG "%s: unexpected authentication frame "
1792 "(alg=%d transaction=%d)\n",
1793 dev->name, auth_alg, auth_transaction);
1794 return;
1795 }
1796
1797 if (status_code != WLAN_STATUS_SUCCESS) {
1798 printk(KERN_DEBUG "%s: AP denied authentication (auth_alg=%d "
1799 "code=%d)\n", dev->name, ifsta->auth_alg, status_code);
1800 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1801 u8 algs[3];
1802 const int num_algs = ARRAY_SIZE(algs);
1803 int i, pos;
1804 algs[0] = algs[1] = algs[2] = 0xff;
1805 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1806 algs[0] = WLAN_AUTH_OPEN;
1807 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1808 algs[1] = WLAN_AUTH_SHARED_KEY;
1809 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1810 algs[2] = WLAN_AUTH_LEAP;
1811 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1812 pos = 0;
1813 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1814 pos = 1;
1815 else
1816 pos = 2;
1817 for (i = 0; i < num_algs; i++) {
1818 pos++;
1819 if (pos >= num_algs)
1820 pos = 0;
1821 if (algs[pos] == ifsta->auth_alg ||
1822 algs[pos] == 0xff)
1823 continue;
1824 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1825 !ieee80211_sta_wep_configured(dev))
1826 continue;
1827 ifsta->auth_alg = algs[pos];
1828 printk(KERN_DEBUG "%s: set auth_alg=%d for "
1829 "next try\n",
1830 dev->name, ifsta->auth_alg);
1831 break;
1832 }
1833 }
1834 return;
1835 }
1836
1837 switch (ifsta->auth_alg) {
1838 case WLAN_AUTH_OPEN:
1839 case WLAN_AUTH_LEAP:
1840 ieee80211_auth_completed(dev, ifsta);
1841 break;
1842 case WLAN_AUTH_SHARED_KEY:
1843 if (ifsta->auth_transaction == 4)
1844 ieee80211_auth_completed(dev, ifsta);
1845 else
1846 ieee80211_auth_challenge(dev, ifsta, mgmt, len);
1847 break;
1848 }
1849 }
1850
1851
1852 static void ieee80211_rx_mgmt_deauth(struct net_device *dev,
1853 struct ieee80211_if_sta *ifsta,
1854 struct ieee80211_mgmt *mgmt,
1855 size_t len)
1856 {
1857 u16 reason_code;
1858 DECLARE_MAC_BUF(mac);
1859
1860 if (len < 24 + 2) {
1861 printk(KERN_DEBUG "%s: too short (%zd) deauthentication frame "
1862 "received from %s - ignored\n",
1863 dev->name, len, print_mac(mac, mgmt->sa));
1864 return;
1865 }
1866
1867 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1868 printk(KERN_DEBUG "%s: deauthentication frame received from "
1869 "unknown AP (SA=%s BSSID=%s) - "
1870 "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1871 print_mac(mac, mgmt->bssid));
1872 return;
1873 }
1874
1875 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1876
1877 printk(KERN_DEBUG "%s: RX deauthentication from %s"
1878 " (reason=%d)\n",
1879 dev->name, print_mac(mac, mgmt->sa), reason_code);
1880
1881 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1882 printk(KERN_DEBUG "%s: deauthenticated\n", dev->name);
1883
1884 if (ifsta->state == IEEE80211_AUTHENTICATE ||
1885 ifsta->state == IEEE80211_ASSOCIATE ||
1886 ifsta->state == IEEE80211_ASSOCIATED) {
1887 ifsta->state = IEEE80211_AUTHENTICATE;
1888 mod_timer(&ifsta->timer, jiffies +
1889 IEEE80211_RETRY_AUTH_INTERVAL);
1890 }
1891
1892 ieee80211_set_disassoc(dev, ifsta, 1);
1893 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1894 }
1895
1896
1897 static void ieee80211_rx_mgmt_disassoc(struct net_device *dev,
1898 struct ieee80211_if_sta *ifsta,
1899 struct ieee80211_mgmt *mgmt,
1900 size_t len)
1901 {
1902 u16 reason_code;
1903 DECLARE_MAC_BUF(mac);
1904
1905 if (len < 24 + 2) {
1906 printk(KERN_DEBUG "%s: too short (%zd) disassociation frame "
1907 "received from %s - ignored\n",
1908 dev->name, len, print_mac(mac, mgmt->sa));
1909 return;
1910 }
1911
1912 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1913 printk(KERN_DEBUG "%s: disassociation frame received from "
1914 "unknown AP (SA=%s BSSID=%s) - "
1915 "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1916 print_mac(mac, mgmt->bssid));
1917 return;
1918 }
1919
1920 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1921
1922 printk(KERN_DEBUG "%s: RX disassociation from %s"
1923 " (reason=%d)\n",
1924 dev->name, print_mac(mac, mgmt->sa), reason_code);
1925
1926 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1927 printk(KERN_DEBUG "%s: disassociated\n", dev->name);
1928
1929 if (ifsta->state == IEEE80211_ASSOCIATED) {
1930 ifsta->state = IEEE80211_ASSOCIATE;
1931 mod_timer(&ifsta->timer, jiffies +
1932 IEEE80211_RETRY_AUTH_INTERVAL);
1933 }
1934
1935 ieee80211_set_disassoc(dev, ifsta, 0);
1936 }
1937
1938
1939 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1940 struct ieee80211_if_sta *ifsta,
1941 struct ieee80211_mgmt *mgmt,
1942 size_t len,
1943 int reassoc)
1944 {
1945 struct ieee80211_local *local = sdata->local;
1946 struct net_device *dev = sdata->dev;
1947 struct ieee80211_supported_band *sband;
1948 struct sta_info *sta;
1949 u64 rates, basic_rates;
1950 u16 capab_info, status_code, aid;
1951 struct ieee802_11_elems elems;
1952 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
1953 u8 *pos;
1954 int i, j;
1955 DECLARE_MAC_BUF(mac);
1956 bool have_higher_than_11mbit = false;
1957
1958 /* AssocResp and ReassocResp have identical structure, so process both
1959 * of them in this function. */
1960
1961 if (ifsta->state != IEEE80211_ASSOCIATE) {
1962 printk(KERN_DEBUG "%s: association frame received from "
1963 "%s, but not in associate state - ignored\n",
1964 dev->name, print_mac(mac, mgmt->sa));
1965 return;
1966 }
1967
1968 if (len < 24 + 6) {
1969 printk(KERN_DEBUG "%s: too short (%zd) association frame "
1970 "received from %s - ignored\n",
1971 dev->name, len, print_mac(mac, mgmt->sa));
1972 return;
1973 }
1974
1975 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1976 printk(KERN_DEBUG "%s: association frame received from "
1977 "unknown AP (SA=%s BSSID=%s) - "
1978 "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1979 print_mac(mac, mgmt->bssid));
1980 return;
1981 }
1982
1983 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1984 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1985 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1986
1987 printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
1988 "status=%d aid=%d)\n",
1989 dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
1990 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1991
1992 if (status_code != WLAN_STATUS_SUCCESS) {
1993 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1994 dev->name, status_code);
1995 /* if this was a reassociation, ensure we try a "full"
1996 * association next time. This works around some broken APs
1997 * which do not correctly reject reassociation requests. */
1998 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1999 return;
2000 }
2001
2002 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2003 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
2004 "set\n", dev->name, aid);
2005 aid &= ~(BIT(15) | BIT(14));
2006
2007 pos = mgmt->u.assoc_resp.variable;
2008 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2009
2010 if (!elems.supp_rates) {
2011 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2012 dev->name);
2013 return;
2014 }
2015
2016 printk(KERN_DEBUG "%s: associated\n", dev->name);
2017 ifsta->aid = aid;
2018 ifsta->ap_capab = capab_info;
2019
2020 kfree(ifsta->assocresp_ies);
2021 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
2022 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
2023 if (ifsta->assocresp_ies)
2024 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
2025
2026 rcu_read_lock();
2027
2028 /* Add STA entry for the AP */
2029 sta = sta_info_get(local, ifsta->bssid);
2030 if (!sta) {
2031 struct ieee80211_sta_bss *bss;
2032 int err;
2033
2034 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
2035 if (!sta) {
2036 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
2037 " the AP\n", dev->name);
2038 rcu_read_unlock();
2039 return;
2040 }
2041 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
2042 local->hw.conf.channel->center_freq,
2043 ifsta->ssid, ifsta->ssid_len);
2044 if (bss) {
2045 sta->last_signal = bss->signal;
2046 sta->last_qual = bss->qual;
2047 sta->last_noise = bss->noise;
2048 ieee80211_rx_bss_put(dev, bss);
2049 }
2050
2051 err = sta_info_insert(sta);
2052 if (err) {
2053 printk(KERN_DEBUG "%s: failed to insert STA entry for"
2054 " the AP (error %d)\n", dev->name, err);
2055 rcu_read_unlock();
2056 return;
2057 }
2058 }
2059
2060 /*
2061 * FIXME: Do we really need to update the sta_info's information here?
2062 * We already know about the AP (we found it in our list) so it
2063 * should already be filled with the right info, no?
2064 * As is stands, all this is racy because typically we assume
2065 * the information that is filled in here (except flags) doesn't
2066 * change while a STA structure is alive. As such, it should move
2067 * to between the sta_info_alloc() and sta_info_insert() above.
2068 */
2069
2070 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
2071 WLAN_STA_AUTHORIZED);
2072
2073 rates = 0;
2074 basic_rates = 0;
2075 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2076
2077 for (i = 0; i < elems.supp_rates_len; i++) {
2078 int rate = (elems.supp_rates[i] & 0x7f) * 5;
2079
2080 if (rate > 110)
2081 have_higher_than_11mbit = true;
2082
2083 for (j = 0; j < sband->n_bitrates; j++) {
2084 if (sband->bitrates[j].bitrate == rate)
2085 rates |= BIT(j);
2086 if (elems.supp_rates[i] & 0x80)
2087 basic_rates |= BIT(j);
2088 }
2089 }
2090
2091 for (i = 0; i < elems.ext_supp_rates_len; i++) {
2092 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
2093
2094 if (rate > 110)
2095 have_higher_than_11mbit = true;
2096
2097 for (j = 0; j < sband->n_bitrates; j++) {
2098 if (sband->bitrates[j].bitrate == rate)
2099 rates |= BIT(j);
2100 if (elems.ext_supp_rates[i] & 0x80)
2101 basic_rates |= BIT(j);
2102 }
2103 }
2104
2105 sta->supp_rates[local->hw.conf.channel->band] = rates;
2106 sdata->basic_rates = basic_rates;
2107
2108 /* cf. IEEE 802.11 9.2.12 */
2109 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
2110 have_higher_than_11mbit)
2111 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
2112 else
2113 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
2114
2115 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2116 (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
2117 struct ieee80211_ht_bss_info bss_info;
2118 ieee80211_ht_cap_ie_to_ht_info(
2119 (struct ieee80211_ht_cap *)
2120 elems.ht_cap_elem, &sta->ht_info);
2121 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2122 (struct ieee80211_ht_addt_info *)
2123 elems.ht_info_elem, &bss_info);
2124 ieee80211_handle_ht(local, 1, &sta->ht_info, &bss_info);
2125 }
2126
2127 rate_control_rate_init(sta, local);
2128
2129 if (elems.wmm_param) {
2130 set_sta_flags(sta, WLAN_STA_WME);
2131 rcu_read_unlock();
2132 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
2133 elems.wmm_param_len);
2134 } else
2135 rcu_read_unlock();
2136
2137 /* set AID and assoc capability,
2138 * ieee80211_set_associated() will tell the driver */
2139 bss_conf->aid = aid;
2140 bss_conf->assoc_capability = capab_info;
2141 ieee80211_set_associated(dev, ifsta, 1);
2142
2143 ieee80211_associated(dev, ifsta);
2144 }
2145
2146
2147 /* Caller must hold local->sta_bss_lock */
2148 static void __ieee80211_rx_bss_hash_add(struct net_device *dev,
2149 struct ieee80211_sta_bss *bss)
2150 {
2151 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2152 u8 hash_idx;
2153
2154 if (bss_mesh_cfg(bss))
2155 hash_idx = mesh_id_hash(bss_mesh_id(bss),
2156 bss_mesh_id_len(bss));
2157 else
2158 hash_idx = STA_HASH(bss->bssid);
2159
2160 bss->hnext = local->sta_bss_hash[hash_idx];
2161 local->sta_bss_hash[hash_idx] = bss;
2162 }
2163
2164
2165 /* Caller must hold local->sta_bss_lock */
2166 static void __ieee80211_rx_bss_hash_del(struct net_device *dev,
2167 struct ieee80211_sta_bss *bss)
2168 {
2169 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2170 struct ieee80211_sta_bss *b, *prev = NULL;
2171 b = local->sta_bss_hash[STA_HASH(bss->bssid)];
2172 while (b) {
2173 if (b == bss) {
2174 if (!prev)
2175 local->sta_bss_hash[STA_HASH(bss->bssid)] =
2176 bss->hnext;
2177 else
2178 prev->hnext = bss->hnext;
2179 break;
2180 }
2181 prev = b;
2182 b = b->hnext;
2183 }
2184 }
2185
2186
2187 static struct ieee80211_sta_bss *
2188 ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int freq,
2189 u8 *ssid, u8 ssid_len)
2190 {
2191 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2192 struct ieee80211_sta_bss *bss;
2193
2194 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2195 if (!bss)
2196 return NULL;
2197 atomic_inc(&bss->users);
2198 atomic_inc(&bss->users);
2199 memcpy(bss->bssid, bssid, ETH_ALEN);
2200 bss->freq = freq;
2201 if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
2202 memcpy(bss->ssid, ssid, ssid_len);
2203 bss->ssid_len = ssid_len;
2204 }
2205
2206 spin_lock_bh(&local->sta_bss_lock);
2207 /* TODO: order by RSSI? */
2208 list_add_tail(&bss->list, &local->sta_bss_list);
2209 __ieee80211_rx_bss_hash_add(dev, bss);
2210 spin_unlock_bh(&local->sta_bss_lock);
2211 return bss;
2212 }
2213
2214 static struct ieee80211_sta_bss *
2215 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int freq,
2216 u8 *ssid, u8 ssid_len)
2217 {
2218 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2219 struct ieee80211_sta_bss *bss;
2220
2221 spin_lock_bh(&local->sta_bss_lock);
2222 bss = local->sta_bss_hash[STA_HASH(bssid)];
2223 while (bss) {
2224 if (!bss_mesh_cfg(bss) &&
2225 !memcmp(bss->bssid, bssid, ETH_ALEN) &&
2226 bss->freq == freq &&
2227 bss->ssid_len == ssid_len &&
2228 (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
2229 atomic_inc(&bss->users);
2230 break;
2231 }
2232 bss = bss->hnext;
2233 }
2234 spin_unlock_bh(&local->sta_bss_lock);
2235 return bss;
2236 }
2237
2238 #ifdef CONFIG_MAC80211_MESH
2239 static struct ieee80211_sta_bss *
2240 ieee80211_rx_mesh_bss_get(struct net_device *dev, u8 *mesh_id, int mesh_id_len,
2241 u8 *mesh_cfg, int freq)
2242 {
2243 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2244 struct ieee80211_sta_bss *bss;
2245
2246 spin_lock_bh(&local->sta_bss_lock);
2247 bss = local->sta_bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
2248 while (bss) {
2249 if (bss_mesh_cfg(bss) &&
2250 !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
2251 bss->freq == freq &&
2252 mesh_id_len == bss->mesh_id_len &&
2253 (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
2254 mesh_id_len))) {
2255 atomic_inc(&bss->users);
2256 break;
2257 }
2258 bss = bss->hnext;
2259 }
2260 spin_unlock_bh(&local->sta_bss_lock);
2261 return bss;
2262 }
2263
2264 static struct ieee80211_sta_bss *
2265 ieee80211_rx_mesh_bss_add(struct net_device *dev, u8 *mesh_id, int mesh_id_len,
2266 u8 *mesh_cfg, int mesh_config_len, int freq)
2267 {
2268 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2269 struct ieee80211_sta_bss *bss;
2270
2271 if (mesh_config_len != MESH_CFG_LEN)
2272 return NULL;
2273
2274 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2275 if (!bss)
2276 return NULL;
2277
2278 bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
2279 if (!bss->mesh_cfg) {
2280 kfree(bss);
2281 return NULL;
2282 }
2283
2284 if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
2285 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
2286 if (!bss->mesh_id) {
2287 kfree(bss->mesh_cfg);
2288 kfree(bss);
2289 return NULL;
2290 }
2291 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
2292 }
2293
2294 atomic_inc(&bss->users);
2295 atomic_inc(&bss->users);
2296 memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
2297 bss->mesh_id_len = mesh_id_len;
2298 bss->freq = freq;
2299 spin_lock_bh(&local->sta_bss_lock);
2300 /* TODO: order by RSSI? */
2301 list_add_tail(&bss->list, &local->sta_bss_list);
2302 __ieee80211_rx_bss_hash_add(dev, bss);
2303 spin_unlock_bh(&local->sta_bss_lock);
2304 return bss;
2305 }
2306 #endif
2307
2308 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
2309 {
2310 kfree(bss->wpa_ie);
2311 kfree(bss->rsn_ie);
2312 kfree(bss->wmm_ie);
2313 kfree(bss->ht_ie);
2314 kfree(bss->ht_add_ie);
2315 kfree(bss_mesh_id(bss));
2316 kfree(bss_mesh_cfg(bss));
2317 kfree(bss);
2318 }
2319
2320
2321 static void ieee80211_rx_bss_put(struct net_device *dev,
2322 struct ieee80211_sta_bss *bss)
2323 {
2324 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2325
2326 local_bh_disable();
2327 if (!atomic_dec_and_lock(&bss->users, &local->sta_bss_lock)) {
2328 local_bh_enable();
2329 return;
2330 }
2331
2332 __ieee80211_rx_bss_hash_del(dev, bss);
2333 list_del(&bss->list);
2334 spin_unlock_bh(&local->sta_bss_lock);
2335 ieee80211_rx_bss_free(bss);
2336 }
2337
2338
2339 void ieee80211_rx_bss_list_init(struct net_device *dev)
2340 {
2341 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2342 spin_lock_init(&local->sta_bss_lock);
2343 INIT_LIST_HEAD(&local->sta_bss_list);
2344 }
2345
2346
2347 void ieee80211_rx_bss_list_deinit(struct net_device *dev)
2348 {
2349 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2350 struct ieee80211_sta_bss *bss, *tmp;
2351
2352 list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
2353 ieee80211_rx_bss_put(dev, bss);
2354 }
2355
2356
2357 static int ieee80211_sta_join_ibss(struct net_device *dev,
2358 struct ieee80211_if_sta *ifsta,
2359 struct ieee80211_sta_bss *bss)
2360 {
2361 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2362 int res, rates, i, j;
2363 struct sk_buff *skb;
2364 struct ieee80211_mgmt *mgmt;
2365 struct ieee80211_tx_info *control;
2366 struct rate_selection ratesel;
2367 u8 *pos;
2368 struct ieee80211_sub_if_data *sdata;
2369 struct ieee80211_supported_band *sband;
2370 union iwreq_data wrqu;
2371
2372 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2373
2374 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2375
2376 /* Remove possible STA entries from other IBSS networks. */
2377 sta_info_flush_delayed(sdata);
2378
2379 if (local->ops->reset_tsf) {
2380 /* Reset own TSF to allow time synchronization work. */
2381 local->ops->reset_tsf(local_to_hw(local));
2382 }
2383 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2384 res = ieee80211_if_config(dev);
2385 if (res)
2386 return res;
2387
2388 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2389
2390 sdata->drop_unencrypted = bss->capability &
2391 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2392
2393 res = ieee80211_set_freq(dev, bss->freq);
2394
2395 if (res)
2396 return res;
2397
2398 /* Set beacon template */
2399 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2400 do {
2401 if (!skb)
2402 break;
2403
2404 skb_reserve(skb, local->hw.extra_tx_headroom);
2405
2406 mgmt = (struct ieee80211_mgmt *)
2407 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2408 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2409 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2410 IEEE80211_STYPE_BEACON);
2411 memset(mgmt->da, 0xff, ETH_ALEN);
2412 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
2413 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2414 mgmt->u.beacon.beacon_int =
2415 cpu_to_le16(local->hw.conf.beacon_int);
2416 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2417
2418 pos = skb_put(skb, 2 + ifsta->ssid_len);
2419 *pos++ = WLAN_EID_SSID;
2420 *pos++ = ifsta->ssid_len;
2421 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2422
2423 rates = bss->supp_rates_len;
2424 if (rates > 8)
2425 rates = 8;
2426 pos = skb_put(skb, 2 + rates);
2427 *pos++ = WLAN_EID_SUPP_RATES;
2428 *pos++ = rates;
2429 memcpy(pos, bss->supp_rates, rates);
2430
2431 if (bss->band == IEEE80211_BAND_2GHZ) {
2432 pos = skb_put(skb, 2 + 1);
2433 *pos++ = WLAN_EID_DS_PARAMS;
2434 *pos++ = 1;
2435 *pos++ = ieee80211_frequency_to_channel(bss->freq);
2436 }
2437
2438 pos = skb_put(skb, 2 + 2);
2439 *pos++ = WLAN_EID_IBSS_PARAMS;
2440 *pos++ = 2;
2441 /* FIX: set ATIM window based on scan results */
2442 *pos++ = 0;
2443 *pos++ = 0;
2444
2445 if (bss->supp_rates_len > 8) {
2446 rates = bss->supp_rates_len - 8;
2447 pos = skb_put(skb, 2 + rates);
2448 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2449 *pos++ = rates;
2450 memcpy(pos, &bss->supp_rates[8], rates);
2451 }
2452
2453 control = IEEE80211_SKB_CB(skb);
2454
2455 rate_control_get_rate(dev, sband, skb, &ratesel);
2456 if (ratesel.rate_idx < 0) {
2457 printk(KERN_DEBUG "%s: Failed to determine TX rate "
2458 "for IBSS beacon\n", dev->name);
2459 break;
2460 }
2461 control->control.vif = &sdata->vif;
2462 control->tx_rate_idx = ratesel.rate_idx;
2463 if (sdata->bss_conf.use_short_preamble &&
2464 sband->bitrates[ratesel.rate_idx].flags & IEEE80211_RATE_SHORT_PREAMBLE)
2465 control->flags |= IEEE80211_TX_CTL_SHORT_PREAMBLE;
2466 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
2467 control->flags |= IEEE80211_TX_CTL_NO_ACK;
2468 control->control.retry_limit = 1;
2469
2470 ifsta->probe_resp = skb_copy(skb, GFP_ATOMIC);
2471 if (ifsta->probe_resp) {
2472 mgmt = (struct ieee80211_mgmt *)
2473 ifsta->probe_resp->data;
2474 mgmt->frame_control =
2475 IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2476 IEEE80211_STYPE_PROBE_RESP);
2477 } else {
2478 printk(KERN_DEBUG "%s: Could not allocate ProbeResp "
2479 "template for IBSS\n", dev->name);
2480 }
2481
2482 if (local->ops->beacon_update &&
2483 local->ops->beacon_update(local_to_hw(local), skb) == 0) {
2484 printk(KERN_DEBUG "%s: Configured IBSS beacon "
2485 "template\n", dev->name);
2486 skb = NULL;
2487 }
2488
2489 rates = 0;
2490 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2491 for (i = 0; i < bss->supp_rates_len; i++) {
2492 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2493 for (j = 0; j < sband->n_bitrates; j++)
2494 if (sband->bitrates[j].bitrate == bitrate)
2495 rates |= BIT(j);
2496 }
2497 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
2498
2499 ieee80211_sta_def_wmm_params(dev, bss, 1);
2500 } while (0);
2501
2502 if (skb) {
2503 printk(KERN_DEBUG "%s: Failed to configure IBSS beacon "
2504 "template\n", dev->name);
2505 dev_kfree_skb(skb);
2506 }
2507
2508 ifsta->state = IEEE80211_IBSS_JOINED;
2509 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2510
2511 memset(&wrqu, 0, sizeof(wrqu));
2512 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2513 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
2514
2515 return res;
2516 }
2517
2518 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
2519 struct ieee802_11_elems *elems,
2520 enum ieee80211_band band)
2521 {
2522 struct ieee80211_supported_band *sband;
2523 struct ieee80211_rate *bitrates;
2524 size_t num_rates;
2525 u64 supp_rates;
2526 int i, j;
2527 sband = local->hw.wiphy->bands[band];
2528
2529 if (!sband) {
2530 WARN_ON(1);
2531 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2532 }
2533
2534 bitrates = sband->bitrates;
2535 num_rates = sband->n_bitrates;
2536 supp_rates = 0;
2537 for (i = 0; i < elems->supp_rates_len +
2538 elems->ext_supp_rates_len; i++) {
2539 u8 rate = 0;
2540 int own_rate;
2541 if (i < elems->supp_rates_len)
2542 rate = elems->supp_rates[i];
2543 else if (elems->ext_supp_rates)
2544 rate = elems->ext_supp_rates
2545 [i - elems->supp_rates_len];
2546 own_rate = 5 * (rate & 0x7f);
2547 for (j = 0; j < num_rates; j++)
2548 if (bitrates[j].bitrate == own_rate)
2549 supp_rates |= BIT(j);
2550 }
2551 return supp_rates;
2552 }
2553
2554
2555 static void ieee80211_rx_bss_info(struct net_device *dev,
2556 struct ieee80211_mgmt *mgmt,
2557 size_t len,
2558 struct ieee80211_rx_status *rx_status,
2559 int beacon)
2560 {
2561 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2562 struct ieee802_11_elems elems;
2563 size_t baselen;
2564 int freq, clen;
2565 struct ieee80211_sta_bss *bss;
2566 struct sta_info *sta;
2567 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2568 u64 beacon_timestamp, rx_timestamp;
2569 struct ieee80211_channel *channel;
2570 DECLARE_MAC_BUF(mac);
2571 DECLARE_MAC_BUF(mac2);
2572
2573 if (!beacon && memcmp(mgmt->da, dev->dev_addr, ETH_ALEN))
2574 return; /* ignore ProbeResp to foreign address */
2575
2576 #if 0
2577 printk(KERN_DEBUG "%s: RX %s from %s to %s\n",
2578 dev->name, beacon ? "Beacon" : "Probe Response",
2579 print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da));
2580 #endif
2581
2582 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2583 if (baselen > len)
2584 return;
2585
2586 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
2587 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
2588
2589 if (ieee80211_vif_is_mesh(&sdata->vif) && elems.mesh_id &&
2590 elems.mesh_config && mesh_matches_local(&elems, dev)) {
2591 u64 rates = ieee80211_sta_get_rates(local, &elems,
2592 rx_status->band);
2593
2594 mesh_neighbour_update(mgmt->sa, rates, dev,
2595 mesh_peer_accepts_plinks(&elems, dev));
2596 }
2597
2598 rcu_read_lock();
2599
2600 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && elems.supp_rates &&
2601 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0 &&
2602 (sta = sta_info_get(local, mgmt->sa))) {
2603 u64 prev_rates;
2604 u64 supp_rates = ieee80211_sta_get_rates(local, &elems,
2605 rx_status->band);
2606
2607 prev_rates = sta->supp_rates[rx_status->band];
2608 sta->supp_rates[rx_status->band] &= supp_rates;
2609 if (sta->supp_rates[rx_status->band] == 0) {
2610 /* No matching rates - this should not really happen.
2611 * Make sure that at least one rate is marked
2612 * supported to avoid issues with TX rate ctrl. */
2613 sta->supp_rates[rx_status->band] =
2614 sdata->u.sta.supp_rates_bits[rx_status->band];
2615 }
2616 if (sta->supp_rates[rx_status->band] != prev_rates) {
2617 printk(KERN_DEBUG "%s: updated supp_rates set for "
2618 "%s based on beacon info (0x%llx & 0x%llx -> "
2619 "0x%llx)\n",
2620 dev->name, print_mac(mac, sta->addr),
2621 (unsigned long long) prev_rates,
2622 (unsigned long long) supp_rates,
2623 (unsigned long long) sta->supp_rates[rx_status->band]);
2624 }
2625 }
2626
2627 rcu_read_unlock();
2628
2629 if (elems.ds_params && elems.ds_params_len == 1)
2630 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
2631 else
2632 freq = rx_status->freq;
2633
2634 channel = ieee80211_get_channel(local->hw.wiphy, freq);
2635
2636 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2637 return;
2638
2639 #ifdef CONFIG_MAC80211_MESH
2640 if (elems.mesh_config)
2641 bss = ieee80211_rx_mesh_bss_get(dev, elems.mesh_id,
2642 elems.mesh_id_len, elems.mesh_config, freq);
2643 else
2644 #endif
2645 bss = ieee80211_rx_bss_get(dev, mgmt->bssid, freq,
2646 elems.ssid, elems.ssid_len);
2647 if (!bss) {
2648 #ifdef CONFIG_MAC80211_MESH
2649 if (elems.mesh_config)
2650 bss = ieee80211_rx_mesh_bss_add(dev, elems.mesh_id,
2651 elems.mesh_id_len, elems.mesh_config,
2652 elems.mesh_config_len, freq);
2653 else
2654 #endif
2655 bss = ieee80211_rx_bss_add(dev, mgmt->bssid, freq,
2656 elems.ssid, elems.ssid_len);
2657 if (!bss)
2658 return;
2659 } else {
2660 #if 0
2661 /* TODO: order by RSSI? */
2662 spin_lock_bh(&local->sta_bss_lock);
2663 list_move_tail(&bss->list, &local->sta_bss_list);
2664 spin_unlock_bh(&local->sta_bss_lock);
2665 #endif
2666 }
2667
2668 /* save the ERP value so that it is available at association time */
2669 if (elems.erp_info && elems.erp_info_len >= 1) {
2670 bss->erp_value = elems.erp_info[0];
2671 bss->has_erp_value = 1;
2672 }
2673
2674 if (elems.ht_cap_elem &&
2675 (!bss->ht_ie || bss->ht_ie_len != elems.ht_cap_elem_len ||
2676 memcmp(bss->ht_ie, elems.ht_cap_elem, elems.ht_cap_elem_len))) {
2677 kfree(bss->ht_ie);
2678 bss->ht_ie = kmalloc(elems.ht_cap_elem_len + 2, GFP_ATOMIC);
2679 if (bss->ht_ie) {
2680 memcpy(bss->ht_ie, elems.ht_cap_elem - 2,
2681 elems.ht_cap_elem_len + 2);
2682 bss->ht_ie_len = elems.ht_cap_elem_len + 2;
2683 } else
2684 bss->ht_ie_len = 0;
2685 } else if (!elems.ht_cap_elem && bss->ht_ie) {
2686 kfree(bss->ht_ie);
2687 bss->ht_ie = NULL;
2688 bss->ht_ie_len = 0;
2689 }
2690
2691 if (elems.ht_info_elem &&
2692 (!bss->ht_add_ie ||
2693 bss->ht_add_ie_len != elems.ht_info_elem_len ||
2694 memcmp(bss->ht_add_ie, elems.ht_info_elem,
2695 elems.ht_info_elem_len))) {
2696 kfree(bss->ht_add_ie);
2697 bss->ht_add_ie =
2698 kmalloc(elems.ht_info_elem_len + 2, GFP_ATOMIC);
2699 if (bss->ht_add_ie) {
2700 memcpy(bss->ht_add_ie, elems.ht_info_elem - 2,
2701 elems.ht_info_elem_len + 2);
2702 bss->ht_add_ie_len = elems.ht_info_elem_len + 2;
2703 } else
2704 bss->ht_add_ie_len = 0;
2705 } else if (!elems.ht_info_elem && bss->ht_add_ie) {
2706 kfree(bss->ht_add_ie);
2707 bss->ht_add_ie = NULL;
2708 bss->ht_add_ie_len = 0;
2709 }
2710
2711 bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
2712 bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
2713
2714 bss->supp_rates_len = 0;
2715 if (elems.supp_rates) {
2716 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2717 if (clen > elems.supp_rates_len)
2718 clen = elems.supp_rates_len;
2719 memcpy(&bss->supp_rates[bss->supp_rates_len], elems.supp_rates,
2720 clen);
2721 bss->supp_rates_len += clen;
2722 }
2723 if (elems.ext_supp_rates) {
2724 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2725 if (clen > elems.ext_supp_rates_len)
2726 clen = elems.ext_supp_rates_len;
2727 memcpy(&bss->supp_rates[bss->supp_rates_len],
2728 elems.ext_supp_rates, clen);
2729 bss->supp_rates_len += clen;
2730 }
2731
2732 bss->band = rx_status->band;
2733
2734 bss->timestamp = beacon_timestamp;
2735 bss->last_update = jiffies;
2736 bss->signal = rx_status->signal;
2737 bss->noise = rx_status->noise;
2738 bss->qual = rx_status->qual;
2739 if (!beacon && !bss->probe_resp)
2740 bss->probe_resp = true;
2741
2742 /*
2743 * In STA mode, the remaining parameters should not be overridden
2744 * by beacons because they're not necessarily accurate there.
2745 */
2746 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
2747 bss->probe_resp && beacon) {
2748 ieee80211_rx_bss_put(dev, bss);
2749 return;
2750 }
2751
2752 if (elems.wpa &&
2753 (!bss->wpa_ie || bss->wpa_ie_len != elems.wpa_len ||
2754 memcmp(bss->wpa_ie, elems.wpa, elems.wpa_len))) {
2755 kfree(bss->wpa_ie);
2756 bss->wpa_ie = kmalloc(elems.wpa_len + 2, GFP_ATOMIC);
2757 if (bss->wpa_ie) {
2758 memcpy(bss->wpa_ie, elems.wpa - 2, elems.wpa_len + 2);
2759 bss->wpa_ie_len = elems.wpa_len + 2;
2760 } else
2761 bss->wpa_ie_len = 0;
2762 } else if (!elems.wpa && bss->wpa_ie) {
2763 kfree(bss->wpa_ie);
2764 bss->wpa_ie = NULL;
2765 bss->wpa_ie_len = 0;
2766 }
2767
2768 if (elems.rsn &&
2769 (!bss->rsn_ie || bss->rsn_ie_len != elems.rsn_len ||
2770 memcmp(bss->rsn_ie, elems.rsn, elems.rsn_len))) {
2771 kfree(bss->rsn_ie);
2772 bss->rsn_ie = kmalloc(elems.rsn_len + 2, GFP_ATOMIC);
2773 if (bss->rsn_ie) {
2774 memcpy(bss->rsn_ie, elems.rsn - 2, elems.rsn_len + 2);
2775 bss->rsn_ie_len = elems.rsn_len + 2;
2776 } else
2777 bss->rsn_ie_len = 0;
2778 } else if (!elems.rsn && bss->rsn_ie) {
2779 kfree(bss->rsn_ie);
2780 bss->rsn_ie = NULL;
2781 bss->rsn_ie_len = 0;
2782 }
2783
2784 /*
2785 * Cf.
2786 * http://www.wipo.int/pctdb/en/wo.jsp?wo=2007047181&IA=WO2007047181&DISPLAY=DESC
2787 *
2788 * quoting:
2789 *
2790 * In particular, "Wi-Fi CERTIFIED for WMM - Support for Multimedia
2791 * Applications with Quality of Service in Wi-Fi Networks," Wi- Fi
2792 * Alliance (September 1, 2004) is incorporated by reference herein.
2793 * The inclusion of the WMM Parameters in probe responses and
2794 * association responses is mandatory for WMM enabled networks. The
2795 * inclusion of the WMM Parameters in beacons, however, is optional.
2796 */
2797
2798 if (elems.wmm_param &&
2799 (!bss->wmm_ie || bss->wmm_ie_len != elems.wmm_param_len ||
2800 memcmp(bss->wmm_ie, elems.wmm_param, elems.wmm_param_len))) {
2801 kfree(bss->wmm_ie);
2802 bss->wmm_ie = kmalloc(elems.wmm_param_len + 2, GFP_ATOMIC);
2803 if (bss->wmm_ie) {
2804 memcpy(bss->wmm_ie, elems.wmm_param - 2,
2805 elems.wmm_param_len + 2);
2806 bss->wmm_ie_len = elems.wmm_param_len + 2;
2807 } else
2808 bss->wmm_ie_len = 0;
2809 } else if (elems.wmm_info &&
2810 (!bss->wmm_ie || bss->wmm_ie_len != elems.wmm_info_len ||
2811 memcmp(bss->wmm_ie, elems.wmm_info, elems.wmm_info_len))) {
2812 /* As for certain AP's Fifth bit is not set in WMM IE in
2813 * beacon frames.So while parsing the beacon frame the
2814 * wmm_info structure is used instead of wmm_param.
2815 * wmm_info structure was never used to set bss->wmm_ie.
2816 * This code fixes this problem by copying the WME
2817 * information from wmm_info to bss->wmm_ie and enabling
2818 * n-band association.
2819 */
2820 kfree(bss->wmm_ie);
2821 bss->wmm_ie = kmalloc(elems.wmm_info_len + 2, GFP_ATOMIC);
2822 if (bss->wmm_ie) {
2823 memcpy(bss->wmm_ie, elems.wmm_info - 2,
2824 elems.wmm_info_len + 2);
2825 bss->wmm_ie_len = elems.wmm_info_len + 2;
2826 } else
2827 bss->wmm_ie_len = 0;
2828 } else if (!elems.wmm_param && !elems.wmm_info && bss->wmm_ie) {
2829 kfree(bss->wmm_ie);
2830 bss->wmm_ie = NULL;
2831 bss->wmm_ie_len = 0;
2832 }
2833
2834 /* check if we need to merge IBSS */
2835 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
2836 !local->sta_sw_scanning && !local->sta_hw_scanning &&
2837 bss->capability & WLAN_CAPABILITY_IBSS &&
2838 bss->freq == local->oper_channel->center_freq &&
2839 elems.ssid_len == sdata->u.sta.ssid_len &&
2840 memcmp(elems.ssid, sdata->u.sta.ssid, sdata->u.sta.ssid_len) == 0) {
2841 if (rx_status->flag & RX_FLAG_TSFT) {
2842 /* in order for correct IBSS merging we need mactime
2843 *
2844 * since mactime is defined as the time the first data
2845 * symbol of the frame hits the PHY, and the timestamp
2846 * of the beacon is defined as "the time that the data
2847 * symbol containing the first bit of the timestamp is
2848 * transmitted to the PHY plus the transmitting STA’s
2849 * delays through its local PHY from the MAC-PHY
2850 * interface to its interface with the WM"
2851 * (802.11 11.1.2) - equals the time this bit arrives at
2852 * the receiver - we have to take into account the
2853 * offset between the two.
2854 * e.g: at 1 MBit that means mactime is 192 usec earlier
2855 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
2856 */
2857 int rate = local->hw.wiphy->bands[rx_status->band]->
2858 bitrates[rx_status->rate_idx].bitrate;
2859 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
2860 } else if (local && local->ops && local->ops->get_tsf)
2861 /* second best option: get current TSF */
2862 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
2863 else
2864 /* can't merge without knowing the TSF */
2865 rx_timestamp = -1LLU;
2866 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2867 printk(KERN_DEBUG "RX beacon SA=%s BSSID="
2868 "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
2869 print_mac(mac, mgmt->sa),
2870 print_mac(mac2, mgmt->bssid),
2871 (unsigned long long)rx_timestamp,
2872 (unsigned long long)beacon_timestamp,
2873 (unsigned long long)(rx_timestamp - beacon_timestamp),
2874 jiffies);
2875 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2876 if (beacon_timestamp > rx_timestamp) {
2877 #ifndef CONFIG_MAC80211_IBSS_DEBUG
2878 if (net_ratelimit())
2879 #endif
2880 printk(KERN_DEBUG "%s: beacon TSF higher than "
2881 "local TSF - IBSS merge with BSSID %s\n",
2882 dev->name, print_mac(mac, mgmt->bssid));
2883 ieee80211_sta_join_ibss(dev, &sdata->u.sta, bss);
2884 ieee80211_ibss_add_sta(dev, NULL,
2885 mgmt->bssid, mgmt->sa,
2886 BIT(rx_status->rate_idx));
2887 }
2888 }
2889
2890 ieee80211_rx_bss_put(dev, bss);
2891 }
2892
2893
2894 static void ieee80211_rx_mgmt_probe_resp(struct net_device *dev,
2895 struct ieee80211_mgmt *mgmt,
2896 size_t len,
2897 struct ieee80211_rx_status *rx_status)
2898 {
2899 ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 0);
2900 }
2901
2902
2903 static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
2904 struct ieee80211_mgmt *mgmt,
2905 size_t len,
2906 struct ieee80211_rx_status *rx_status)
2907 {
2908 struct ieee80211_sub_if_data *sdata;
2909 struct ieee80211_if_sta *ifsta;
2910 size_t baselen;
2911 struct ieee802_11_elems elems;
2912 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2913 struct ieee80211_conf *conf = &local->hw.conf;
2914 u32 changed = 0;
2915
2916 ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 1);
2917
2918 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2919 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2920 return;
2921 ifsta = &sdata->u.sta;
2922
2923 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
2924 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
2925 return;
2926
2927 /* Process beacon from the current BSS */
2928 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2929 if (baselen > len)
2930 return;
2931
2932 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
2933
2934 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
2935 elems.wmm_param_len);
2936
2937 /* Do not send changes to driver if we are scanning. This removes
2938 * requirement that driver's bss_info_changed function needs to be
2939 * atomic. */
2940 if (local->sta_sw_scanning || local->sta_hw_scanning)
2941 return;
2942
2943 if (elems.erp_info && elems.erp_info_len >= 1)
2944 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
2945 else {
2946 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
2947 changed |= ieee80211_handle_protect_preamb(sdata, false,
2948 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
2949 }
2950
2951 if (elems.ht_cap_elem && elems.ht_info_elem &&
2952 elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
2953 struct ieee80211_ht_bss_info bss_info;
2954
2955 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2956 (struct ieee80211_ht_addt_info *)
2957 elems.ht_info_elem, &bss_info);
2958 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
2959 &bss_info);
2960 }
2961
2962 ieee80211_bss_info_change_notify(sdata, changed);
2963 }
2964
2965
2966 static void ieee80211_rx_mgmt_probe_req(struct net_device *dev,
2967 struct ieee80211_if_sta *ifsta,
2968 struct ieee80211_mgmt *mgmt,
2969 size_t len,
2970 struct ieee80211_rx_status *rx_status)
2971 {
2972 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2973 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2974 int tx_last_beacon;
2975 struct sk_buff *skb;
2976 struct ieee80211_mgmt *resp;
2977 u8 *pos, *end;
2978 DECLARE_MAC_BUF(mac);
2979 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2980 DECLARE_MAC_BUF(mac2);
2981 DECLARE_MAC_BUF(mac3);
2982 #endif
2983
2984 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS ||
2985 ifsta->state != IEEE80211_IBSS_JOINED ||
2986 len < 24 + 2 || !ifsta->probe_resp)
2987 return;
2988
2989 if (local->ops->tx_last_beacon)
2990 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2991 else
2992 tx_last_beacon = 1;
2993
2994 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2995 printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
2996 "%s (tx_last_beacon=%d)\n",
2997 dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
2998 print_mac(mac3, mgmt->bssid), tx_last_beacon);
2999 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3000
3001 if (!tx_last_beacon)
3002 return;
3003
3004 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
3005 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
3006 return;
3007
3008 end = ((u8 *) mgmt) + len;
3009 pos = mgmt->u.probe_req.variable;
3010 if (pos[0] != WLAN_EID_SSID ||
3011 pos + 2 + pos[1] > end) {
3012 if (net_ratelimit()) {
3013 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
3014 "from %s\n",
3015 dev->name, print_mac(mac, mgmt->sa));
3016 }
3017 return;
3018 }
3019 if (pos[1] != 0 &&
3020 (pos[1] != ifsta->ssid_len ||
3021 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
3022 /* Ignore ProbeReq for foreign SSID */
3023 return;
3024 }
3025
3026 /* Reply with ProbeResp */
3027 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
3028 if (!skb)
3029 return;
3030
3031 resp = (struct ieee80211_mgmt *) skb->data;
3032 memcpy(resp->da, mgmt->sa, ETH_ALEN);
3033 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3034 printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
3035 dev->name, print_mac(mac, resp->da));
3036 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3037 ieee80211_sta_tx(dev, skb, 0);
3038 }
3039
3040 static void ieee80211_rx_mgmt_action(struct net_device *dev,
3041 struct ieee80211_if_sta *ifsta,
3042 struct ieee80211_mgmt *mgmt,
3043 size_t len,
3044 struct ieee80211_rx_status *rx_status)
3045 {
3046 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3047
3048 if (len < IEEE80211_MIN_ACTION_SIZE)
3049 return;
3050
3051 switch (mgmt->u.action.category) {
3052 case WLAN_CATEGORY_BACK:
3053 switch (mgmt->u.action.u.addba_req.action_code) {
3054 case WLAN_ACTION_ADDBA_REQ:
3055 if (len < (IEEE80211_MIN_ACTION_SIZE +
3056 sizeof(mgmt->u.action.u.addba_req)))
3057 break;
3058 ieee80211_sta_process_addba_request(dev, mgmt, len);
3059 break;
3060 case WLAN_ACTION_ADDBA_RESP:
3061 if (len < (IEEE80211_MIN_ACTION_SIZE +
3062 sizeof(mgmt->u.action.u.addba_resp)))
3063 break;
3064 ieee80211_sta_process_addba_resp(dev, mgmt, len);
3065 break;
3066 case WLAN_ACTION_DELBA:
3067 if (len < (IEEE80211_MIN_ACTION_SIZE +
3068 sizeof(mgmt->u.action.u.delba)))
3069 break;
3070 ieee80211_sta_process_delba(dev, mgmt, len);
3071 break;
3072 default:
3073 if (net_ratelimit())
3074 printk(KERN_DEBUG "%s: Rx unknown A-MPDU action\n",
3075 dev->name);
3076 break;
3077 }
3078 break;
3079 case PLINK_CATEGORY:
3080 if (ieee80211_vif_is_mesh(&sdata->vif))
3081 mesh_rx_plink_frame(dev, mgmt, len, rx_status);
3082 break;
3083 case MESH_PATH_SEL_CATEGORY:
3084 if (ieee80211_vif_is_mesh(&sdata->vif))
3085 mesh_rx_path_sel_frame(dev, mgmt, len);
3086 break;
3087 default:
3088 if (net_ratelimit())
3089 printk(KERN_DEBUG "%s: Rx unknown action frame - "
3090 "category=%d\n", dev->name, mgmt->u.action.category);
3091 break;
3092 }
3093 }
3094
3095 void ieee80211_sta_rx_mgmt(struct net_device *dev, struct sk_buff *skb,
3096 struct ieee80211_rx_status *rx_status)
3097 {
3098 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3099 struct ieee80211_sub_if_data *sdata;
3100 struct ieee80211_if_sta *ifsta;
3101 struct ieee80211_mgmt *mgmt;
3102 u16 fc;
3103
3104 if (skb->len < 24)
3105 goto fail;
3106
3107 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3108 ifsta = &sdata->u.sta;
3109
3110 mgmt = (struct ieee80211_mgmt *) skb->data;
3111 fc = le16_to_cpu(mgmt->frame_control);
3112
3113 switch (fc & IEEE80211_FCTL_STYPE) {
3114 case IEEE80211_STYPE_PROBE_REQ:
3115 case IEEE80211_STYPE_PROBE_RESP:
3116 case IEEE80211_STYPE_BEACON:
3117 case IEEE80211_STYPE_ACTION:
3118 memcpy(skb->cb, rx_status, sizeof(*rx_status));
3119 case IEEE80211_STYPE_AUTH:
3120 case IEEE80211_STYPE_ASSOC_RESP:
3121 case IEEE80211_STYPE_REASSOC_RESP:
3122 case IEEE80211_STYPE_DEAUTH:
3123 case IEEE80211_STYPE_DISASSOC:
3124 skb_queue_tail(&ifsta->skb_queue, skb);
3125 queue_work(local->hw.workqueue, &ifsta->work);
3126 return;
3127 default:
3128 printk(KERN_DEBUG "%s: received unknown management frame - "
3129 "stype=%d\n", dev->name,
3130 (fc & IEEE80211_FCTL_STYPE) >> 4);
3131 break;
3132 }
3133
3134 fail:
3135 kfree_skb(skb);
3136 }
3137
3138
3139 static void ieee80211_sta_rx_queued_mgmt(struct net_device *dev,
3140 struct sk_buff *skb)
3141 {
3142 struct ieee80211_rx_status *rx_status;
3143 struct ieee80211_sub_if_data *sdata;
3144 struct ieee80211_if_sta *ifsta;
3145 struct ieee80211_mgmt *mgmt;
3146 u16 fc;
3147
3148 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3149 ifsta = &sdata->u.sta;
3150
3151 rx_status = (struct ieee80211_rx_status *) skb->cb;
3152 mgmt = (struct ieee80211_mgmt *) skb->data;
3153 fc = le16_to_cpu(mgmt->frame_control);
3154
3155 switch (fc & IEEE80211_FCTL_STYPE) {
3156 case IEEE80211_STYPE_PROBE_REQ:
3157 ieee80211_rx_mgmt_probe_req(dev, ifsta, mgmt, skb->len,
3158 rx_status);
3159 break;
3160 case IEEE80211_STYPE_PROBE_RESP:
3161 ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
3162 break;
3163 case IEEE80211_STYPE_BEACON:
3164 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
3165 break;
3166 case IEEE80211_STYPE_AUTH:
3167 ieee80211_rx_mgmt_auth(dev, ifsta, mgmt, skb->len);
3168 break;
3169 case IEEE80211_STYPE_ASSOC_RESP:
3170 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
3171 break;
3172 case IEEE80211_STYPE_REASSOC_RESP:
3173 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
3174 break;
3175 case IEEE80211_STYPE_DEAUTH:
3176 ieee80211_rx_mgmt_deauth(dev, ifsta, mgmt, skb->len);
3177 break;
3178 case IEEE80211_STYPE_DISASSOC:
3179 ieee80211_rx_mgmt_disassoc(dev, ifsta, mgmt, skb->len);
3180 break;
3181 case IEEE80211_STYPE_ACTION:
3182 ieee80211_rx_mgmt_action(dev, ifsta, mgmt, skb->len, rx_status);
3183 break;
3184 }
3185
3186 kfree_skb(skb);
3187 }
3188
3189
3190 ieee80211_rx_result
3191 ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
3192 struct ieee80211_rx_status *rx_status)
3193 {
3194 struct ieee80211_mgmt *mgmt;
3195 u16 fc;
3196
3197 if (skb->len < 2)
3198 return RX_DROP_UNUSABLE;
3199
3200 mgmt = (struct ieee80211_mgmt *) skb->data;
3201 fc = le16_to_cpu(mgmt->frame_control);
3202
3203 if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL)
3204 return RX_CONTINUE;
3205
3206 if (skb->len < 24)
3207 return RX_DROP_MONITOR;
3208
3209 if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) {
3210 if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP) {
3211 ieee80211_rx_mgmt_probe_resp(dev, mgmt,
3212 skb->len, rx_status);
3213 dev_kfree_skb(skb);
3214 return RX_QUEUED;
3215 } else if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) {
3216 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len,
3217 rx_status);
3218 dev_kfree_skb(skb);
3219 return RX_QUEUED;
3220 }
3221 }
3222 return RX_CONTINUE;
3223 }
3224
3225
3226 static int ieee80211_sta_active_ibss(struct net_device *dev)
3227 {
3228 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3229 int active = 0;
3230 struct sta_info *sta;
3231 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3232
3233 rcu_read_lock();
3234
3235 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3236 if (sta->sdata == sdata &&
3237 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
3238 jiffies)) {
3239 active++;
3240 break;
3241 }
3242 }
3243
3244 rcu_read_unlock();
3245
3246 return active;
3247 }
3248
3249
3250 static void ieee80211_sta_expire(struct net_device *dev, unsigned long exp_time)
3251 {
3252 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3253 struct sta_info *sta, *tmp;
3254 LIST_HEAD(tmp_list);
3255 DECLARE_MAC_BUF(mac);
3256 unsigned long flags;
3257
3258 spin_lock_irqsave(&local->sta_lock, flags);
3259 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
3260 if (time_after(jiffies, sta->last_rx + exp_time)) {
3261 printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
3262 dev->name, print_mac(mac, sta->addr));
3263 __sta_info_unlink(&sta);
3264 if (sta)
3265 list_add(&sta->list, &tmp_list);
3266 }
3267 spin_unlock_irqrestore(&local->sta_lock, flags);
3268
3269 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
3270 sta_info_destroy(sta);
3271 }
3272
3273
3274 static void ieee80211_sta_merge_ibss(struct net_device *dev,
3275 struct ieee80211_if_sta *ifsta)
3276 {
3277 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
3278
3279 ieee80211_sta_expire(dev, IEEE80211_IBSS_INACTIVITY_LIMIT);
3280 if (ieee80211_sta_active_ibss(dev))
3281 return;
3282
3283 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
3284 "IBSS networks with same SSID (merge)\n", dev->name);
3285 ieee80211_sta_req_scan(dev, ifsta->ssid, ifsta->ssid_len);
3286 }
3287
3288
3289 #ifdef CONFIG_MAC80211_MESH
3290 static void ieee80211_mesh_housekeeping(struct net_device *dev,
3291 struct ieee80211_if_sta *ifsta)
3292 {
3293 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3294 bool free_plinks;
3295
3296 ieee80211_sta_expire(dev, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
3297 mesh_path_expire(dev);
3298
3299 free_plinks = mesh_plink_availables(sdata);
3300 if (free_plinks != sdata->u.sta.accepting_plinks)
3301 ieee80211_if_config_beacon(dev);
3302
3303 mod_timer(&ifsta->timer, jiffies +
3304 IEEE80211_MESH_HOUSEKEEPING_INTERVAL);
3305 }
3306
3307
3308 void ieee80211_start_mesh(struct net_device *dev)
3309 {
3310 struct ieee80211_if_sta *ifsta;
3311 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3312 ifsta = &sdata->u.sta;
3313 ifsta->state = IEEE80211_MESH_UP;
3314 ieee80211_sta_timer((unsigned long)sdata);
3315 }
3316 #endif
3317
3318
3319 void ieee80211_sta_timer(unsigned long data)
3320 {
3321 struct ieee80211_sub_if_data *sdata =
3322 (struct ieee80211_sub_if_data *) data;
3323 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3324 struct ieee80211_local *local = wdev_priv(&sdata->wdev);
3325
3326 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3327 queue_work(local->hw.workqueue, &ifsta->work);
3328 }
3329
3330 void ieee80211_sta_work(struct work_struct *work)
3331 {
3332 struct ieee80211_sub_if_data *sdata =
3333 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
3334 struct net_device *dev = sdata->dev;
3335 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3336 struct ieee80211_if_sta *ifsta;
3337 struct sk_buff *skb;
3338
3339 if (!netif_running(dev))
3340 return;
3341
3342 if (local->sta_sw_scanning || local->sta_hw_scanning)
3343 return;
3344
3345 if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
3346 sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
3347 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT) {
3348 printk(KERN_DEBUG "%s: ieee80211_sta_work: non-STA interface "
3349 "(type=%d)\n", dev->name, sdata->vif.type);
3350 return;
3351 }
3352 ifsta = &sdata->u.sta;
3353
3354 while ((skb = skb_dequeue(&ifsta->skb_queue)))
3355 ieee80211_sta_rx_queued_mgmt(dev, skb);
3356
3357 #ifdef CONFIG_MAC80211_MESH
3358 if (ifsta->preq_queue_len &&
3359 time_after(jiffies,
3360 ifsta->last_preq + msecs_to_jiffies(ifsta->mshcfg.dot11MeshHWMPpreqMinInterval)))
3361 mesh_path_start_discovery(dev);
3362 #endif
3363
3364 if (ifsta->state != IEEE80211_AUTHENTICATE &&
3365 ifsta->state != IEEE80211_ASSOCIATE &&
3366 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
3367 if (ifsta->scan_ssid_len)
3368 ieee80211_sta_start_scan(dev, ifsta->scan_ssid, ifsta->scan_ssid_len);
3369 else
3370 ieee80211_sta_start_scan(dev, NULL, 0);
3371 return;
3372 }
3373
3374 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
3375 if (ieee80211_sta_config_auth(dev, ifsta))
3376 return;
3377 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3378 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
3379 return;
3380
3381 switch (ifsta->state) {
3382 case IEEE80211_DISABLED:
3383 break;
3384 case IEEE80211_AUTHENTICATE:
3385 ieee80211_authenticate(dev, ifsta);
3386 break;
3387 case IEEE80211_ASSOCIATE:
3388 ieee80211_associate(dev, ifsta);
3389 break;
3390 case IEEE80211_ASSOCIATED:
3391 ieee80211_associated(dev, ifsta);
3392 break;
3393 case IEEE80211_IBSS_SEARCH:
3394 ieee80211_sta_find_ibss(dev, ifsta);
3395 break;
3396 case IEEE80211_IBSS_JOINED:
3397 ieee80211_sta_merge_ibss(dev, ifsta);
3398 break;
3399 #ifdef CONFIG_MAC80211_MESH
3400 case IEEE80211_MESH_UP:
3401 ieee80211_mesh_housekeeping(dev, ifsta);
3402 break;
3403 #endif
3404 default:
3405 printk(KERN_DEBUG "ieee80211_sta_work: Unknown state %d\n",
3406 ifsta->state);
3407 break;
3408 }
3409
3410 if (ieee80211_privacy_mismatch(dev, ifsta)) {
3411 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
3412 "mixed-cell disabled - disassociate\n", dev->name);
3413
3414 ieee80211_send_disassoc(dev, ifsta, WLAN_REASON_UNSPECIFIED);
3415 ieee80211_set_disassoc(dev, ifsta, 0);
3416 }
3417 }
3418
3419
3420 static void ieee80211_sta_reset_auth(struct net_device *dev,
3421 struct ieee80211_if_sta *ifsta)
3422 {
3423 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3424
3425 if (local->ops->reset_tsf) {
3426 /* Reset own TSF to allow time synchronization work. */
3427 local->ops->reset_tsf(local_to_hw(local));
3428 }
3429
3430 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
3431
3432
3433 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
3434 ifsta->auth_alg = WLAN_AUTH_OPEN;
3435 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
3436 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
3437 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
3438 ifsta->auth_alg = WLAN_AUTH_LEAP;
3439 else
3440 ifsta->auth_alg = WLAN_AUTH_OPEN;
3441 printk(KERN_DEBUG "%s: Initial auth_alg=%d\n", dev->name,
3442 ifsta->auth_alg);
3443 ifsta->auth_transaction = -1;
3444 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
3445 ifsta->auth_tries = ifsta->assoc_tries = 0;
3446 netif_carrier_off(dev);
3447 }
3448
3449
3450 void ieee80211_sta_req_auth(struct net_device *dev,
3451 struct ieee80211_if_sta *ifsta)
3452 {
3453 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3454 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3455
3456 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3457 return;
3458
3459 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
3460 IEEE80211_STA_AUTO_BSSID_SEL)) &&
3461 (ifsta->flags & (IEEE80211_STA_SSID_SET |
3462 IEEE80211_STA_AUTO_SSID_SEL))) {
3463 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3464 queue_work(local->hw.workqueue, &ifsta->work);
3465 }
3466 }
3467
3468 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
3469 const char *ssid, int ssid_len)
3470 {
3471 int tmp, hidden_ssid;
3472
3473 if (ssid_len == ifsta->ssid_len &&
3474 !memcmp(ifsta->ssid, ssid, ssid_len))
3475 return 1;
3476
3477 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
3478 return 0;
3479
3480 hidden_ssid = 1;
3481 tmp = ssid_len;
3482 while (tmp--) {
3483 if (ssid[tmp] != '\0') {
3484 hidden_ssid = 0;
3485 break;
3486 }
3487 }
3488
3489 if (hidden_ssid && ifsta->ssid_len == ssid_len)
3490 return 1;
3491
3492 if (ssid_len == 1 && ssid[0] == ' ')
3493 return 1;
3494
3495 return 0;
3496 }
3497
3498 static int ieee80211_sta_config_auth(struct net_device *dev,
3499 struct ieee80211_if_sta *ifsta)
3500 {
3501 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3502 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3503 struct ieee80211_sta_bss *bss, *selected = NULL;
3504 int top_rssi = 0, freq;
3505
3506 spin_lock_bh(&local->sta_bss_lock);
3507 freq = local->oper_channel->center_freq;
3508 list_for_each_entry(bss, &local->sta_bss_list, list) {
3509 if (!(bss->capability & WLAN_CAPABILITY_ESS))
3510 continue;
3511
3512 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
3513 IEEE80211_STA_AUTO_BSSID_SEL |
3514 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
3515 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
3516 !!sdata->default_key))
3517 continue;
3518
3519 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
3520 bss->freq != freq)
3521 continue;
3522
3523 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
3524 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
3525 continue;
3526
3527 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
3528 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
3529 continue;
3530
3531 if (!selected || top_rssi < bss->signal) {
3532 selected = bss;
3533 top_rssi = bss->signal;
3534 }
3535 }
3536 if (selected)
3537 atomic_inc(&selected->users);
3538 spin_unlock_bh(&local->sta_bss_lock);
3539
3540 if (selected) {
3541 ieee80211_set_freq(dev, selected->freq);
3542 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
3543 ieee80211_sta_set_ssid(dev, selected->ssid,
3544 selected->ssid_len);
3545 ieee80211_sta_set_bssid(dev, selected->bssid);
3546 ieee80211_sta_def_wmm_params(dev, selected, 0);
3547 ieee80211_rx_bss_put(dev, selected);
3548 ifsta->state = IEEE80211_AUTHENTICATE;
3549 ieee80211_sta_reset_auth(dev, ifsta);
3550 return 0;
3551 } else {
3552 if (ifsta->state != IEEE80211_AUTHENTICATE) {
3553 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
3554 ieee80211_sta_start_scan(dev, NULL, 0);
3555 else
3556 ieee80211_sta_start_scan(dev, ifsta->ssid,
3557 ifsta->ssid_len);
3558 ifsta->state = IEEE80211_AUTHENTICATE;
3559 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3560 } else
3561 ifsta->state = IEEE80211_DISABLED;
3562 }
3563 return -1;
3564 }
3565
3566
3567 static int ieee80211_sta_create_ibss(struct net_device *dev,
3568 struct ieee80211_if_sta *ifsta)
3569 {
3570 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3571 struct ieee80211_sta_bss *bss;
3572 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3573 struct ieee80211_supported_band *sband;
3574 u8 bssid[ETH_ALEN], *pos;
3575 int i;
3576 int ret;
3577 DECLARE_MAC_BUF(mac);
3578
3579 #if 0
3580 /* Easier testing, use fixed BSSID. */
3581 memset(bssid, 0xfe, ETH_ALEN);
3582 #else
3583 /* Generate random, not broadcast, locally administered BSSID. Mix in
3584 * own MAC address to make sure that devices that do not have proper
3585 * random number generator get different BSSID. */
3586 get_random_bytes(bssid, ETH_ALEN);
3587 for (i = 0; i < ETH_ALEN; i++)
3588 bssid[i] ^= dev->dev_addr[i];
3589 bssid[0] &= ~0x01;
3590 bssid[0] |= 0x02;
3591 #endif
3592
3593 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
3594 dev->name, print_mac(mac, bssid));
3595
3596 bss = ieee80211_rx_bss_add(dev, bssid,
3597 local->hw.conf.channel->center_freq,
3598 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
3599 if (!bss)
3600 return -ENOMEM;
3601
3602 bss->band = local->hw.conf.channel->band;
3603 sband = local->hw.wiphy->bands[bss->band];
3604
3605 if (local->hw.conf.beacon_int == 0)
3606 local->hw.conf.beacon_int = 100;
3607 bss->beacon_int = local->hw.conf.beacon_int;
3608 bss->last_update = jiffies;
3609 bss->capability = WLAN_CAPABILITY_IBSS;
3610
3611 if (sdata->default_key)
3612 bss->capability |= WLAN_CAPABILITY_PRIVACY;
3613 else
3614 sdata->drop_unencrypted = 0;
3615
3616 bss->supp_rates_len = sband->n_bitrates;
3617 pos = bss->supp_rates;
3618 for (i = 0; i < sband->n_bitrates; i++) {
3619 int rate = sband->bitrates[i].bitrate;
3620 *pos++ = (u8) (rate / 5);
3621 }
3622
3623 ret = ieee80211_sta_join_ibss(dev, ifsta, bss);
3624 ieee80211_rx_bss_put(dev, bss);
3625 return ret;
3626 }
3627
3628
3629 static int ieee80211_sta_find_ibss(struct net_device *dev,
3630 struct ieee80211_if_sta *ifsta)
3631 {
3632 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3633 struct ieee80211_sta_bss *bss;
3634 int found = 0;
3635 u8 bssid[ETH_ALEN];
3636 int active_ibss;
3637 DECLARE_MAC_BUF(mac);
3638 DECLARE_MAC_BUF(mac2);
3639
3640 if (ifsta->ssid_len == 0)
3641 return -EINVAL;
3642
3643 active_ibss = ieee80211_sta_active_ibss(dev);
3644 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3645 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
3646 dev->name, active_ibss);
3647 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3648 spin_lock_bh(&local->sta_bss_lock);
3649 list_for_each_entry(bss, &local->sta_bss_list, list) {
3650 if (ifsta->ssid_len != bss->ssid_len ||
3651 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
3652 || !(bss->capability & WLAN_CAPABILITY_IBSS))
3653 continue;
3654 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3655 printk(KERN_DEBUG " bssid=%s found\n",
3656 print_mac(mac, bss->bssid));
3657 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3658 memcpy(bssid, bss->bssid, ETH_ALEN);
3659 found = 1;
3660 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
3661 break;
3662 }
3663 spin_unlock_bh(&local->sta_bss_lock);
3664
3665 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3666 printk(KERN_DEBUG " sta_find_ibss: selected %s current "
3667 "%s\n", print_mac(mac, bssid), print_mac(mac2, ifsta->bssid));
3668 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3669 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
3670 (bss = ieee80211_rx_bss_get(dev, bssid,
3671 local->hw.conf.channel->center_freq,
3672 ifsta->ssid, ifsta->ssid_len))) {
3673 int ret;
3674 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
3675 " based on configured SSID\n",
3676 dev->name, print_mac(mac, bssid));
3677 ret = ieee80211_sta_join_ibss(dev, ifsta, bss);
3678 ieee80211_rx_bss_put(dev, bss);
3679 return ret;
3680 }
3681 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3682 printk(KERN_DEBUG " did not try to join ibss\n");
3683 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3684
3685 /* Selected IBSS not found in current scan results - try to scan */
3686 if (ifsta->state == IEEE80211_IBSS_JOINED &&
3687 !ieee80211_sta_active_ibss(dev)) {
3688 mod_timer(&ifsta->timer, jiffies +
3689 IEEE80211_IBSS_MERGE_INTERVAL);
3690 } else if (time_after(jiffies, local->last_scan_completed +
3691 IEEE80211_SCAN_INTERVAL)) {
3692 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
3693 "join\n", dev->name);
3694 return ieee80211_sta_req_scan(dev, ifsta->ssid,
3695 ifsta->ssid_len);
3696 } else if (ifsta->state != IEEE80211_IBSS_JOINED) {
3697 int interval = IEEE80211_SCAN_INTERVAL;
3698
3699 if (time_after(jiffies, ifsta->ibss_join_req +
3700 IEEE80211_IBSS_JOIN_TIMEOUT)) {
3701 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
3702 (!(local->oper_channel->flags &
3703 IEEE80211_CHAN_NO_IBSS)))
3704 return ieee80211_sta_create_ibss(dev, ifsta);
3705 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
3706 printk(KERN_DEBUG "%s: IBSS not allowed on"
3707 " %d MHz\n", dev->name,
3708 local->hw.conf.channel->center_freq);
3709 }
3710
3711 /* No IBSS found - decrease scan interval and continue
3712 * scanning. */
3713 interval = IEEE80211_SCAN_INTERVAL_SLOW;
3714 }
3715
3716 ifsta->state = IEEE80211_IBSS_SEARCH;
3717 mod_timer(&ifsta->timer, jiffies + interval);
3718 return 0;
3719 }
3720
3721 return 0;
3722 }
3723
3724
3725 int ieee80211_sta_set_ssid(struct net_device *dev, char *ssid, size_t len)
3726 {
3727 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3728 struct ieee80211_if_sta *ifsta;
3729
3730 if (len > IEEE80211_MAX_SSID_LEN)
3731 return -EINVAL;
3732
3733 ifsta = &sdata->u.sta;
3734
3735 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0)
3736 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
3737 memcpy(ifsta->ssid, ssid, len);
3738 memset(ifsta->ssid + len, 0, IEEE80211_MAX_SSID_LEN - len);
3739 ifsta->ssid_len = len;
3740
3741 if (len)
3742 ifsta->flags |= IEEE80211_STA_SSID_SET;
3743 else
3744 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
3745 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3746 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
3747 ifsta->ibss_join_req = jiffies;
3748 ifsta->state = IEEE80211_IBSS_SEARCH;
3749 return ieee80211_sta_find_ibss(dev, ifsta);
3750 }
3751 return 0;
3752 }
3753
3754
3755 int ieee80211_sta_get_ssid(struct net_device *dev, char *ssid, size_t *len)
3756 {
3757 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3758 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3759 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
3760 *len = ifsta->ssid_len;
3761 return 0;
3762 }
3763
3764
3765 int ieee80211_sta_set_bssid(struct net_device *dev, u8 *bssid)
3766 {
3767 struct ieee80211_sub_if_data *sdata;
3768 struct ieee80211_if_sta *ifsta;
3769 int res;
3770
3771 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3772 ifsta = &sdata->u.sta;
3773
3774 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3775 memcpy(ifsta->bssid, bssid, ETH_ALEN);
3776 res = ieee80211_if_config(dev);
3777 if (res) {
3778 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
3779 "the low-level driver\n", dev->name);
3780 return res;
3781 }
3782 }
3783
3784 if (is_valid_ether_addr(bssid))
3785 ifsta->flags |= IEEE80211_STA_BSSID_SET;
3786 else
3787 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
3788
3789 return 0;
3790 }
3791
3792
3793 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
3794 struct ieee80211_sub_if_data *sdata,
3795 int powersave)
3796 {
3797 struct sk_buff *skb;
3798 struct ieee80211_hdr *nullfunc;
3799 u16 fc;
3800
3801 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
3802 if (!skb) {
3803 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
3804 "frame\n", sdata->dev->name);
3805 return;
3806 }
3807 skb_reserve(skb, local->hw.extra_tx_headroom);
3808
3809 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
3810 memset(nullfunc, 0, 24);
3811 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
3812 IEEE80211_FCTL_TODS;
3813 if (powersave)
3814 fc |= IEEE80211_FCTL_PM;
3815 nullfunc->frame_control = cpu_to_le16(fc);
3816 memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
3817 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
3818 memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
3819
3820 ieee80211_sta_tx(sdata->dev, skb, 0);
3821 }
3822
3823
3824 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3825 {
3826 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
3827 ieee80211_vif_is_mesh(&sdata->vif))
3828 ieee80211_sta_timer((unsigned long)sdata);
3829 }
3830
3831 void ieee80211_scan_completed(struct ieee80211_hw *hw)
3832 {
3833 struct ieee80211_local *local = hw_to_local(hw);
3834 struct net_device *dev = local->scan_dev;
3835 struct ieee80211_sub_if_data *sdata;
3836 union iwreq_data wrqu;
3837
3838 local->last_scan_completed = jiffies;
3839 memset(&wrqu, 0, sizeof(wrqu));
3840 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
3841
3842 if (local->sta_hw_scanning) {
3843 local->sta_hw_scanning = 0;
3844 if (ieee80211_hw_config(local))
3845 printk(KERN_DEBUG "%s: failed to restore operational "
3846 "channel after scan\n", dev->name);
3847 /* Restart STA timer for HW scan case */
3848 rcu_read_lock();
3849 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3850 ieee80211_restart_sta_timer(sdata);
3851 rcu_read_unlock();
3852
3853 goto done;
3854 }
3855
3856 local->sta_sw_scanning = 0;
3857 if (ieee80211_hw_config(local))
3858 printk(KERN_DEBUG "%s: failed to restore operational "
3859 "channel after scan\n", dev->name);
3860
3861
3862 netif_tx_lock_bh(local->mdev);
3863 local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
3864 local->ops->configure_filter(local_to_hw(local),
3865 FIF_BCN_PRBRESP_PROMISC,
3866 &local->filter_flags,
3867 local->mdev->mc_count,
3868 local->mdev->mc_list);
3869
3870 netif_tx_unlock_bh(local->mdev);
3871
3872 rcu_read_lock();
3873 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3874
3875 /* No need to wake the master device. */
3876 if (sdata->dev == local->mdev)
3877 continue;
3878
3879 /* Tell AP we're back */
3880 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
3881 sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED)
3882 ieee80211_send_nullfunc(local, sdata, 0);
3883
3884 ieee80211_restart_sta_timer(sdata);
3885
3886 netif_wake_queue(sdata->dev);
3887 }
3888 rcu_read_unlock();
3889
3890 done:
3891 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3892 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
3893 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3894 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
3895 (!ifsta->state == IEEE80211_IBSS_JOINED &&
3896 !ieee80211_sta_active_ibss(dev)))
3897 ieee80211_sta_find_ibss(dev, ifsta);
3898 }
3899 }
3900 EXPORT_SYMBOL(ieee80211_scan_completed);
3901
3902 void ieee80211_sta_scan_work(struct work_struct *work)
3903 {
3904 struct ieee80211_local *local =
3905 container_of(work, struct ieee80211_local, scan_work.work);
3906 struct net_device *dev = local->scan_dev;
3907 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3908 struct ieee80211_supported_band *sband;
3909 struct ieee80211_channel *chan;
3910 int skip;
3911 unsigned long next_delay = 0;
3912
3913 if (!local->sta_sw_scanning)
3914 return;
3915
3916 switch (local->scan_state) {
3917 case SCAN_SET_CHANNEL:
3918 /*
3919 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
3920 * after we successfully scanned the last channel of the last
3921 * band (and the last band is supported by the hw)
3922 */
3923 if (local->scan_band < IEEE80211_NUM_BANDS)
3924 sband = local->hw.wiphy->bands[local->scan_band];
3925 else
3926 sband = NULL;
3927
3928 /*
3929 * If we are at an unsupported band and have more bands
3930 * left to scan, advance to the next supported one.
3931 */
3932 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
3933 local->scan_band++;
3934 sband = local->hw.wiphy->bands[local->scan_band];
3935 local->scan_channel_idx = 0;
3936 }
3937
3938 /* if no more bands/channels left, complete scan */
3939 if (!sband || local->scan_channel_idx >= sband->n_channels) {
3940 ieee80211_scan_completed(local_to_hw(local));
3941 return;
3942 }
3943 skip = 0;
3944 chan = &sband->channels[local->scan_channel_idx];
3945
3946 if (chan->flags & IEEE80211_CHAN_DISABLED ||
3947 (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3948 chan->flags & IEEE80211_CHAN_NO_IBSS))
3949 skip = 1;
3950
3951 if (!skip) {
3952 local->scan_channel = chan;
3953 if (ieee80211_hw_config(local)) {
3954 printk(KERN_DEBUG "%s: failed to set freq to "
3955 "%d MHz for scan\n", dev->name,
3956 chan->center_freq);
3957 skip = 1;
3958 }
3959 }
3960
3961 /* advance state machine to next channel/band */
3962 local->scan_channel_idx++;
3963 if (local->scan_channel_idx >= sband->n_channels) {
3964 /*
3965 * scan_band may end up == IEEE80211_NUM_BANDS, but
3966 * we'll catch that case above and complete the scan
3967 * if that is the case.
3968 */
3969 local->scan_band++;
3970 local->scan_channel_idx = 0;
3971 }
3972
3973 if (skip)
3974 break;
3975
3976 next_delay = IEEE80211_PROBE_DELAY +
3977 usecs_to_jiffies(local->hw.channel_change_time);
3978 local->scan_state = SCAN_SEND_PROBE;
3979 break;
3980 case SCAN_SEND_PROBE:
3981 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
3982 local->scan_state = SCAN_SET_CHANNEL;
3983
3984 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
3985 break;
3986 ieee80211_send_probe_req(dev, NULL, local->scan_ssid,
3987 local->scan_ssid_len);
3988 next_delay = IEEE80211_CHANNEL_TIME;
3989 break;
3990 }
3991
3992 if (local->sta_sw_scanning)
3993 queue_delayed_work(local->hw.workqueue, &local->scan_work,
3994 next_delay);
3995 }
3996
3997
3998 static int ieee80211_sta_start_scan(struct net_device *dev,
3999 u8 *ssid, size_t ssid_len)
4000 {
4001 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4002 struct ieee80211_sub_if_data *sdata;
4003
4004 if (ssid_len > IEEE80211_MAX_SSID_LEN)
4005 return -EINVAL;
4006
4007 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
4008 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
4009 * BSSID: MACAddress
4010 * SSID
4011 * ScanType: ACTIVE, PASSIVE
4012 * ProbeDelay: delay (in microseconds) to be used prior to transmitting
4013 * a Probe frame during active scanning
4014 * ChannelList
4015 * MinChannelTime (>= ProbeDelay), in TU
4016 * MaxChannelTime: (>= MinChannelTime), in TU
4017 */
4018
4019 /* MLME-SCAN.confirm
4020 * BSSDescriptionSet
4021 * ResultCode: SUCCESS, INVALID_PARAMETERS
4022 */
4023
4024 if (local->sta_sw_scanning || local->sta_hw_scanning) {
4025 if (local->scan_dev == dev)
4026 return 0;
4027 return -EBUSY;
4028 }
4029
4030 if (local->ops->hw_scan) {
4031 int rc = local->ops->hw_scan(local_to_hw(local),
4032 ssid, ssid_len);
4033 if (!rc) {
4034 local->sta_hw_scanning = 1;
4035 local->scan_dev = dev;
4036 }
4037 return rc;
4038 }
4039
4040 local->sta_sw_scanning = 1;
4041
4042 rcu_read_lock();
4043 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4044
4045 /* Don't stop the master interface, otherwise we can't transmit
4046 * probes! */
4047 if (sdata->dev == local->mdev)
4048 continue;
4049
4050 netif_stop_queue(sdata->dev);
4051 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
4052 (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED))
4053 ieee80211_send_nullfunc(local, sdata, 1);
4054 }
4055 rcu_read_unlock();
4056
4057 if (ssid) {
4058 local->scan_ssid_len = ssid_len;
4059 memcpy(local->scan_ssid, ssid, ssid_len);
4060 } else
4061 local->scan_ssid_len = 0;
4062 local->scan_state = SCAN_SET_CHANNEL;
4063 local->scan_channel_idx = 0;
4064 local->scan_band = IEEE80211_BAND_2GHZ;
4065 local->scan_dev = dev;
4066
4067 netif_tx_lock_bh(local->mdev);
4068 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
4069 local->ops->configure_filter(local_to_hw(local),
4070 FIF_BCN_PRBRESP_PROMISC,
4071 &local->filter_flags,
4072 local->mdev->mc_count,
4073 local->mdev->mc_list);
4074 netif_tx_unlock_bh(local->mdev);
4075
4076 /* TODO: start scan as soon as all nullfunc frames are ACKed */
4077 queue_delayed_work(local->hw.workqueue, &local->scan_work,
4078 IEEE80211_CHANNEL_TIME);
4079
4080 return 0;
4081 }
4082
4083
4084 int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len)
4085 {
4086 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4087 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4088 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4089
4090 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4091 return ieee80211_sta_start_scan(dev, ssid, ssid_len);
4092
4093 if (local->sta_sw_scanning || local->sta_hw_scanning) {
4094 if (local->scan_dev == dev)
4095 return 0;
4096 return -EBUSY;
4097 }
4098
4099 ifsta->scan_ssid_len = ssid_len;
4100 if (ssid_len)
4101 memcpy(ifsta->scan_ssid, ssid, ssid_len);
4102 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
4103 queue_work(local->hw.workqueue, &ifsta->work);
4104 return 0;
4105 }
4106
4107 static char *
4108 ieee80211_sta_scan_result(struct net_device *dev,
4109 struct iw_request_info *info,
4110 struct ieee80211_sta_bss *bss,
4111 char *current_ev, char *end_buf)
4112 {
4113 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4114 struct iw_event iwe;
4115
4116 if (time_after(jiffies,
4117 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
4118 return current_ev;
4119
4120 memset(&iwe, 0, sizeof(iwe));
4121 iwe.cmd = SIOCGIWAP;
4122 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
4123 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
4124 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4125 IW_EV_ADDR_LEN);
4126
4127 memset(&iwe, 0, sizeof(iwe));
4128 iwe.cmd = SIOCGIWESSID;
4129 if (bss_mesh_cfg(bss)) {
4130 iwe.u.data.length = bss_mesh_id_len(bss);
4131 iwe.u.data.flags = 1;
4132 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4133 &iwe, bss_mesh_id(bss));
4134 } else {
4135 iwe.u.data.length = bss->ssid_len;
4136 iwe.u.data.flags = 1;
4137 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4138 &iwe, bss->ssid);
4139 }
4140
4141 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
4142 || bss_mesh_cfg(bss)) {
4143 memset(&iwe, 0, sizeof(iwe));
4144 iwe.cmd = SIOCGIWMODE;
4145 if (bss_mesh_cfg(bss))
4146 iwe.u.mode = IW_MODE_MESH;
4147 else if (bss->capability & WLAN_CAPABILITY_ESS)
4148 iwe.u.mode = IW_MODE_MASTER;
4149 else
4150 iwe.u.mode = IW_MODE_ADHOC;
4151 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
4152 &iwe, IW_EV_UINT_LEN);
4153 }
4154
4155 memset(&iwe, 0, sizeof(iwe));
4156 iwe.cmd = SIOCGIWFREQ;
4157 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
4158 iwe.u.freq.e = 0;
4159 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4160 IW_EV_FREQ_LEN);
4161
4162 memset(&iwe, 0, sizeof(iwe));
4163 iwe.cmd = SIOCGIWFREQ;
4164 iwe.u.freq.m = bss->freq;
4165 iwe.u.freq.e = 6;
4166 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4167 IW_EV_FREQ_LEN);
4168 memset(&iwe, 0, sizeof(iwe));
4169 iwe.cmd = IWEVQUAL;
4170 iwe.u.qual.qual = bss->qual;
4171 iwe.u.qual.level = bss->signal;
4172 iwe.u.qual.noise = bss->noise;
4173 iwe.u.qual.updated = local->wstats_flags;
4174 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4175 IW_EV_QUAL_LEN);
4176
4177 memset(&iwe, 0, sizeof(iwe));
4178 iwe.cmd = SIOCGIWENCODE;
4179 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
4180 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
4181 else
4182 iwe.u.data.flags = IW_ENCODE_DISABLED;
4183 iwe.u.data.length = 0;
4184 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4185 &iwe, "");
4186
4187 if (bss && bss->wpa_ie) {
4188 memset(&iwe, 0, sizeof(iwe));
4189 iwe.cmd = IWEVGENIE;
4190 iwe.u.data.length = bss->wpa_ie_len;
4191 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4192 &iwe, bss->wpa_ie);
4193 }
4194
4195 if (bss && bss->rsn_ie) {
4196 memset(&iwe, 0, sizeof(iwe));
4197 iwe.cmd = IWEVGENIE;
4198 iwe.u.data.length = bss->rsn_ie_len;
4199 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4200 &iwe, bss->rsn_ie);
4201 }
4202
4203 if (bss && bss->ht_ie) {
4204 memset(&iwe, 0, sizeof(iwe));
4205 iwe.cmd = IWEVGENIE;
4206 iwe.u.data.length = bss->ht_ie_len;
4207 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4208 &iwe, bss->ht_ie);
4209 }
4210
4211 if (bss && bss->supp_rates_len > 0) {
4212 /* display all supported rates in readable format */
4213 char *p = current_ev + iwe_stream_lcp_len(info);
4214 int i;
4215
4216 memset(&iwe, 0, sizeof(iwe));
4217 iwe.cmd = SIOCGIWRATE;
4218 /* Those two flags are ignored... */
4219 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
4220
4221 for (i = 0; i < bss->supp_rates_len; i++) {
4222 iwe.u.bitrate.value = ((bss->supp_rates[i] &
4223 0x7f) * 500000);
4224 p = iwe_stream_add_value(info, current_ev, p,
4225 end_buf, &iwe, IW_EV_PARAM_LEN);
4226 }
4227 current_ev = p;
4228 }
4229
4230 if (bss) {
4231 char *buf;
4232 buf = kmalloc(30, GFP_ATOMIC);
4233 if (buf) {
4234 memset(&iwe, 0, sizeof(iwe));
4235 iwe.cmd = IWEVCUSTOM;
4236 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
4237 iwe.u.data.length = strlen(buf);
4238 current_ev = iwe_stream_add_point(info, current_ev,
4239 end_buf,
4240 &iwe, buf);
4241 kfree(buf);
4242 }
4243 }
4244
4245 if (bss_mesh_cfg(bss)) {
4246 char *buf;
4247 u8 *cfg = bss_mesh_cfg(bss);
4248 buf = kmalloc(50, GFP_ATOMIC);
4249 if (buf) {
4250 memset(&iwe, 0, sizeof(iwe));
4251 iwe.cmd = IWEVCUSTOM;
4252 sprintf(buf, "Mesh network (version %d)", cfg[0]);
4253 iwe.u.data.length = strlen(buf);
4254 current_ev = iwe_stream_add_point(info, current_ev,
4255 end_buf,
4256 &iwe, buf);
4257 sprintf(buf, "Path Selection Protocol ID: "
4258 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
4259 cfg[4]);
4260 iwe.u.data.length = strlen(buf);
4261 current_ev = iwe_stream_add_point(info, current_ev,
4262 end_buf,
4263 &iwe, buf);
4264 sprintf(buf, "Path Selection Metric ID: "
4265 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
4266 cfg[8]);
4267 iwe.u.data.length = strlen(buf);
4268 current_ev = iwe_stream_add_point(info, current_ev,
4269 end_buf,
4270 &iwe, buf);
4271 sprintf(buf, "Congestion Control Mode ID: "
4272 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
4273 cfg[11], cfg[12]);
4274 iwe.u.data.length = strlen(buf);
4275 current_ev = iwe_stream_add_point(info, current_ev,
4276 end_buf,
4277 &iwe, buf);
4278 sprintf(buf, "Channel Precedence: "
4279 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
4280 cfg[15], cfg[16]);
4281 iwe.u.data.length = strlen(buf);
4282 current_ev = iwe_stream_add_point(info, current_ev,
4283 end_buf,
4284 &iwe, buf);
4285 kfree(buf);
4286 }
4287 }
4288
4289 return current_ev;
4290 }
4291
4292
4293 int ieee80211_sta_scan_results(struct net_device *dev,
4294 struct iw_request_info *info,
4295 char *buf, size_t len)
4296 {
4297 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4298 char *current_ev = buf;
4299 char *end_buf = buf + len;
4300 struct ieee80211_sta_bss *bss;
4301
4302 spin_lock_bh(&local->sta_bss_lock);
4303 list_for_each_entry(bss, &local->sta_bss_list, list) {
4304 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
4305 spin_unlock_bh(&local->sta_bss_lock);
4306 return -E2BIG;
4307 }
4308 current_ev = ieee80211_sta_scan_result(dev, info, bss,
4309 current_ev, end_buf);
4310 }
4311 spin_unlock_bh(&local->sta_bss_lock);
4312 return current_ev - buf;
4313 }
4314
4315
4316 int ieee80211_sta_set_extra_ie(struct net_device *dev, char *ie, size_t len)
4317 {
4318 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4319 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4320
4321 kfree(ifsta->extra_ie);
4322 if (len == 0) {
4323 ifsta->extra_ie = NULL;
4324 ifsta->extra_ie_len = 0;
4325 return 0;
4326 }
4327 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
4328 if (!ifsta->extra_ie) {
4329 ifsta->extra_ie_len = 0;
4330 return -ENOMEM;
4331 }
4332 memcpy(ifsta->extra_ie, ie, len);
4333 ifsta->extra_ie_len = len;
4334 return 0;
4335 }
4336
4337
4338 struct sta_info *ieee80211_ibss_add_sta(struct net_device *dev,
4339 struct sk_buff *skb, u8 *bssid,
4340 u8 *addr, u64 supp_rates)
4341 {
4342 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4343 struct sta_info *sta;
4344 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4345 DECLARE_MAC_BUF(mac);
4346 int band = local->hw.conf.channel->band;
4347
4348 /* TODO: Could consider removing the least recently used entry and
4349 * allow new one to be added. */
4350 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
4351 if (net_ratelimit()) {
4352 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
4353 "entry %s\n", dev->name, print_mac(mac, addr));
4354 }
4355 return NULL;
4356 }
4357
4358 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid))
4359 return NULL;
4360
4361 printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
4362 wiphy_name(local->hw.wiphy), print_mac(mac, addr), dev->name);
4363
4364 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
4365 if (!sta)
4366 return NULL;
4367
4368 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
4369
4370 if (supp_rates)
4371 sta->supp_rates[band] = supp_rates;
4372 else
4373 sta->supp_rates[band] = sdata->u.sta.supp_rates_bits[band];
4374
4375 rate_control_rate_init(sta, local);
4376
4377 if (sta_info_insert(sta))
4378 return NULL;
4379
4380 return sta;
4381 }
4382
4383
4384 int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason)
4385 {
4386 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4387 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4388
4389 printk(KERN_DEBUG "%s: deauthenticate(reason=%d)\n",
4390 dev->name, reason);
4391
4392 if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
4393 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
4394 return -EINVAL;
4395
4396 ieee80211_send_deauth(dev, ifsta, reason);
4397 ieee80211_set_disassoc(dev, ifsta, 1);
4398 return 0;
4399 }
4400
4401
4402 int ieee80211_sta_disassociate(struct net_device *dev, u16 reason)
4403 {
4404 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4405 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4406
4407 printk(KERN_DEBUG "%s: disassociate(reason=%d)\n",
4408 dev->name, reason);
4409
4410 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4411 return -EINVAL;
4412
4413 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
4414 return -1;
4415
4416 ieee80211_send_disassoc(dev, ifsta, reason);
4417 ieee80211_set_disassoc(dev, ifsta, 0);
4418 return 0;
4419 }
4420
4421 void ieee80211_notify_mac(struct ieee80211_hw *hw,
4422 enum ieee80211_notification_types notif_type)
4423 {
4424 struct ieee80211_local *local = hw_to_local(hw);
4425 struct ieee80211_sub_if_data *sdata;
4426
4427 switch (notif_type) {
4428 case IEEE80211_NOTIFY_RE_ASSOC:
4429 rcu_read_lock();
4430 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4431
4432 if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
4433 ieee80211_sta_req_auth(sdata->dev,
4434 &sdata->u.sta);
4435 }
4436
4437 }
4438 rcu_read_unlock();
4439 break;
4440 }
4441 }
4442 EXPORT_SYMBOL(ieee80211_notify_mac);
Linux 2.6 libata-dev (mirror)