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mac80211: fix mesh beaconing
[linux-2.6.git] / net / mac80211 / mlme.c
blobacb04133a95dc699735fcb1932fe16a64b4d720a
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 ieee80211_local *local,
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 = get_unaligned_le16(pos + 2);
349 #ifdef CONFIG_MAC80211_VERBOSE_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 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
370 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
371 DECLARE_MAC_BUF(mac);
372 #endif
373 u32 changed = 0;
374
375 if (use_protection != bss_conf->use_cts_prot) {
376 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
377 if (net_ratelimit()) {
378 printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
379 "%s)\n",
380 sdata->dev->name,
381 use_protection ? "enabled" : "disabled",
382 print_mac(mac, ifsta->bssid));
383 }
384 #endif
385 bss_conf->use_cts_prot = use_protection;
386 changed |= BSS_CHANGED_ERP_CTS_PROT;
387 }
388
389 if (use_short_preamble != bss_conf->use_short_preamble) {
390 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
391 if (net_ratelimit()) {
392 printk(KERN_DEBUG "%s: switched to %s barker preamble"
393 " (BSSID=%s)\n",
394 sdata->dev->name,
395 use_short_preamble ? "short" : "long",
396 print_mac(mac, ifsta->bssid));
397 }
398 #endif
399 bss_conf->use_short_preamble = use_short_preamble;
400 changed |= BSS_CHANGED_ERP_PREAMBLE;
401 }
402
403 return changed;
404 }
405
406 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
407 u8 erp_value)
408 {
409 bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
410 bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
411
412 return ieee80211_handle_protect_preamb(sdata,
413 use_protection, use_short_preamble);
414 }
415
416 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
417 struct ieee80211_sta_bss *bss)
418 {
419 u32 changed = 0;
420
421 if (bss->has_erp_value)
422 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
423 else {
424 u16 capab = bss->capability;
425 changed |= ieee80211_handle_protect_preamb(sdata, false,
426 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
427 }
428
429 return changed;
430 }
431
432 int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
433 struct ieee80211_ht_info *ht_info)
434 {
435
436 if (ht_info == NULL)
437 return -EINVAL;
438
439 memset(ht_info, 0, sizeof(*ht_info));
440
441 if (ht_cap_ie) {
442 u8 ampdu_info = ht_cap_ie->ampdu_params_info;
443
444 ht_info->ht_supported = 1;
445 ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
446 ht_info->ampdu_factor =
447 ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
448 ht_info->ampdu_density =
449 (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
450 memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
451 } else
452 ht_info->ht_supported = 0;
453
454 return 0;
455 }
456
457 int ieee80211_ht_addt_info_ie_to_ht_bss_info(
458 struct ieee80211_ht_addt_info *ht_add_info_ie,
459 struct ieee80211_ht_bss_info *bss_info)
460 {
461 if (bss_info == NULL)
462 return -EINVAL;
463
464 memset(bss_info, 0, sizeof(*bss_info));
465
466 if (ht_add_info_ie) {
467 u16 op_mode;
468 op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);
469
470 bss_info->primary_channel = ht_add_info_ie->control_chan;
471 bss_info->bss_cap = ht_add_info_ie->ht_param;
472 bss_info->bss_op_mode = (u8)(op_mode & 0xff);
473 }
474
475 return 0;
476 }
477
478 static void ieee80211_sta_send_associnfo(struct net_device *dev,
479 struct ieee80211_if_sta *ifsta)
480 {
481 char *buf;
482 size_t len;
483 int i;
484 union iwreq_data wrqu;
485
486 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
487 return;
488
489 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
490 ifsta->assocresp_ies_len), GFP_KERNEL);
491 if (!buf)
492 return;
493
494 len = sprintf(buf, "ASSOCINFO(");
495 if (ifsta->assocreq_ies) {
496 len += sprintf(buf + len, "ReqIEs=");
497 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
498 len += sprintf(buf + len, "%02x",
499 ifsta->assocreq_ies[i]);
500 }
501 }
502 if (ifsta->assocresp_ies) {
503 if (ifsta->assocreq_ies)
504 len += sprintf(buf + len, " ");
505 len += sprintf(buf + len, "RespIEs=");
506 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
507 len += sprintf(buf + len, "%02x",
508 ifsta->assocresp_ies[i]);
509 }
510 }
511 len += sprintf(buf + len, ")");
512
513 if (len > IW_CUSTOM_MAX) {
514 len = sprintf(buf, "ASSOCRESPIE=");
515 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
516 len += sprintf(buf + len, "%02x",
517 ifsta->assocresp_ies[i]);
518 }
519 }
520
521 memset(&wrqu, 0, sizeof(wrqu));
522 wrqu.data.length = len;
523 wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
524
525 kfree(buf);
526 }
527
528
529 static void ieee80211_set_associated(struct net_device *dev,
530 struct ieee80211_if_sta *ifsta,
531 bool assoc)
532 {
533 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
534 struct ieee80211_local *local = sdata->local;
535 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
536 union iwreq_data wrqu;
537 u32 changed = BSS_CHANGED_ASSOC;
538
539 if (assoc) {
540 struct ieee80211_sta_bss *bss;
541
542 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
543
544 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
545 return;
546
547 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
548 conf->channel->center_freq,
549 ifsta->ssid, ifsta->ssid_len);
550 if (bss) {
551 /* set timing information */
552 sdata->bss_conf.beacon_int = bss->beacon_int;
553 sdata->bss_conf.timestamp = bss->timestamp;
554
555 changed |= ieee80211_handle_bss_capability(sdata, bss);
556
557 ieee80211_rx_bss_put(local, bss);
558 }
559
560 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
561 changed |= BSS_CHANGED_HT;
562 sdata->bss_conf.assoc_ht = 1;
563 sdata->bss_conf.ht_conf = &conf->ht_conf;
564 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
565 }
566
567 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
568 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
569 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
570 ieee80211_sta_send_associnfo(dev, ifsta);
571 } else {
572 netif_carrier_off(dev);
573 ieee80211_sta_tear_down_BA_sessions(dev, ifsta->bssid);
574 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
575 changed |= ieee80211_reset_erp_info(dev);
576
577 sdata->bss_conf.assoc_ht = 0;
578 sdata->bss_conf.ht_conf = NULL;
579 sdata->bss_conf.ht_bss_conf = NULL;
580
581 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
582 }
583 ifsta->last_probe = jiffies;
584 ieee80211_led_assoc(local, assoc);
585
586 sdata->bss_conf.assoc = assoc;
587 ieee80211_bss_info_change_notify(sdata, changed);
588
589 if (assoc)
590 netif_carrier_on(dev);
591
592 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
593 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
594 }
595
596 static void ieee80211_set_disassoc(struct net_device *dev,
597 struct ieee80211_if_sta *ifsta, int deauth)
598 {
599 if (deauth)
600 ifsta->auth_tries = 0;
601 ifsta->assoc_tries = 0;
602 ieee80211_set_associated(dev, ifsta, 0);
603 }
604
605 void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
606 int encrypt)
607 {
608 struct ieee80211_sub_if_data *sdata;
609
610 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
611 skb->dev = sdata->local->mdev;
612 skb_set_mac_header(skb, 0);
613 skb_set_network_header(skb, 0);
614 skb_set_transport_header(skb, 0);
615
616 skb->iif = sdata->dev->ifindex;
617 skb->do_not_encrypt = !encrypt;
618
619 dev_queue_xmit(skb);
620 }
621
622
623 static void ieee80211_send_auth(struct net_device *dev,
624 struct ieee80211_if_sta *ifsta,
625 int transaction, u8 *extra, size_t extra_len,
626 int encrypt)
627 {
628 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
629 struct sk_buff *skb;
630 struct ieee80211_mgmt *mgmt;
631
632 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
633 sizeof(*mgmt) + 6 + extra_len);
634 if (!skb) {
635 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
636 "frame\n", dev->name);
637 return;
638 }
639 skb_reserve(skb, local->hw.extra_tx_headroom);
640
641 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
642 memset(mgmt, 0, 24 + 6);
643 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
644 IEEE80211_STYPE_AUTH);
645 if (encrypt)
646 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
647 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
648 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
649 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
650 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
651 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
652 ifsta->auth_transaction = transaction + 1;
653 mgmt->u.auth.status_code = cpu_to_le16(0);
654 if (extra)
655 memcpy(skb_put(skb, extra_len), extra, extra_len);
656
657 ieee80211_sta_tx(dev, skb, encrypt);
658 }
659
660
661 static void ieee80211_authenticate(struct net_device *dev,
662 struct ieee80211_if_sta *ifsta)
663 {
664 DECLARE_MAC_BUF(mac);
665
666 ifsta->auth_tries++;
667 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
668 printk(KERN_DEBUG "%s: authentication with AP %s"
669 " timed out\n",
670 dev->name, print_mac(mac, ifsta->bssid));
671 ifsta->state = IEEE80211_DISABLED;
672 return;
673 }
674
675 ifsta->state = IEEE80211_AUTHENTICATE;
676 printk(KERN_DEBUG "%s: authenticate with AP %s\n",
677 dev->name, print_mac(mac, ifsta->bssid));
678
679 ieee80211_send_auth(dev, ifsta, 1, NULL, 0, 0);
680
681 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
682 }
683
684 static int ieee80211_compatible_rates(struct ieee80211_sta_bss *bss,
685 struct ieee80211_supported_band *sband,
686 u64 *rates)
687 {
688 int i, j, count;
689 *rates = 0;
690 count = 0;
691 for (i = 0; i < bss->supp_rates_len; i++) {
692 int rate = (bss->supp_rates[i] & 0x7F) * 5;
693
694 for (j = 0; j < sband->n_bitrates; j++)
695 if (sband->bitrates[j].bitrate == rate) {
696 *rates |= BIT(j);
697 count++;
698 break;
699 }
700 }
701
702 return count;
703 }
704
705 static void ieee80211_send_assoc(struct net_device *dev,
706 struct ieee80211_if_sta *ifsta)
707 {
708 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
709 struct sk_buff *skb;
710 struct ieee80211_mgmt *mgmt;
711 u8 *pos, *ies;
712 int i, len, count, rates_len, supp_rates_len;
713 u16 capab;
714 struct ieee80211_sta_bss *bss;
715 int wmm = 0;
716 struct ieee80211_supported_band *sband;
717 u64 rates = 0;
718
719 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
720 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
721 ifsta->ssid_len);
722 if (!skb) {
723 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
724 "frame\n", dev->name);
725 return;
726 }
727 skb_reserve(skb, local->hw.extra_tx_headroom);
728
729 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
730
731 capab = ifsta->capab;
732
733 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
734 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
735 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
736 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
737 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
738 }
739
740 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
741 local->hw.conf.channel->center_freq,
742 ifsta->ssid, ifsta->ssid_len);
743 if (bss) {
744 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
745 capab |= WLAN_CAPABILITY_PRIVACY;
746 if (bss->wmm_ie)
747 wmm = 1;
748
749 /* get all rates supported by the device and the AP as
750 * some APs don't like getting a superset of their rates
751 * in the association request (e.g. D-Link DAP 1353 in
752 * b-only mode) */
753 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
754
755 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
756 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
757 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
758
759 ieee80211_rx_bss_put(local, bss);
760 } else {
761 rates = ~0;
762 rates_len = sband->n_bitrates;
763 }
764
765 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
766 memset(mgmt, 0, 24);
767 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
768 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
769 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
770
771 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
772 skb_put(skb, 10);
773 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
774 IEEE80211_STYPE_REASSOC_REQ);
775 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
776 mgmt->u.reassoc_req.listen_interval = cpu_to_le16(1);
777 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
778 ETH_ALEN);
779 } else {
780 skb_put(skb, 4);
781 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
782 IEEE80211_STYPE_ASSOC_REQ);
783 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
784 mgmt->u.assoc_req.listen_interval = cpu_to_le16(1);
785 }
786
787 /* SSID */
788 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
789 *pos++ = WLAN_EID_SSID;
790 *pos++ = ifsta->ssid_len;
791 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
792
793 /* add all rates which were marked to be used above */
794 supp_rates_len = rates_len;
795 if (supp_rates_len > 8)
796 supp_rates_len = 8;
797
798 len = sband->n_bitrates;
799 pos = skb_put(skb, supp_rates_len + 2);
800 *pos++ = WLAN_EID_SUPP_RATES;
801 *pos++ = supp_rates_len;
802
803 count = 0;
804 for (i = 0; i < sband->n_bitrates; i++) {
805 if (BIT(i) & rates) {
806 int rate = sband->bitrates[i].bitrate;
807 *pos++ = (u8) (rate / 5);
808 if (++count == 8)
809 break;
810 }
811 }
812
813 if (count == 8) {
814 pos = skb_put(skb, rates_len - count + 2);
815 *pos++ = WLAN_EID_EXT_SUPP_RATES;
816 *pos++ = rates_len - count;
817
818 for (i++; i < sband->n_bitrates; i++) {
819 if (BIT(i) & rates) {
820 int rate = sband->bitrates[i].bitrate;
821 *pos++ = (u8) (rate / 5);
822 }
823 }
824 }
825
826 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
827 /* 1. power capabilities */
828 pos = skb_put(skb, 4);
829 *pos++ = WLAN_EID_PWR_CAPABILITY;
830 *pos++ = 2;
831 *pos++ = 0; /* min tx power */
832 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
833
834 /* 2. supported channels */
835 /* TODO: get this in reg domain format */
836 pos = skb_put(skb, 2 * sband->n_channels + 2);
837 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
838 *pos++ = 2 * sband->n_channels;
839 for (i = 0; i < sband->n_channels; i++) {
840 *pos++ = ieee80211_frequency_to_channel(
841 sband->channels[i].center_freq);
842 *pos++ = 1; /* one channel in the subband*/
843 }
844 }
845
846 if (ifsta->extra_ie) {
847 pos = skb_put(skb, ifsta->extra_ie_len);
848 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
849 }
850
851 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
852 pos = skb_put(skb, 9);
853 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
854 *pos++ = 7; /* len */
855 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
856 *pos++ = 0x50;
857 *pos++ = 0xf2;
858 *pos++ = 2; /* WME */
859 *pos++ = 0; /* WME info */
860 *pos++ = 1; /* WME ver */
861 *pos++ = 0;
862 }
863
864 /* wmm support is a must to HT */
865 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
866 sband->ht_info.ht_supported && bss->ht_add_ie) {
867 struct ieee80211_ht_addt_info *ht_add_info =
868 (struct ieee80211_ht_addt_info *)bss->ht_add_ie;
869 u16 cap = sband->ht_info.cap;
870 __le16 tmp;
871 u32 flags = local->hw.conf.channel->flags;
872
873 switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
874 case IEEE80211_HT_IE_CHA_SEC_ABOVE:
875 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
876 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
877 cap &= ~IEEE80211_HT_CAP_SGI_40;
878 }
879 break;
880 case IEEE80211_HT_IE_CHA_SEC_BELOW:
881 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
882 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
883 cap &= ~IEEE80211_HT_CAP_SGI_40;
884 }
885 break;
886 }
887
888 tmp = cpu_to_le16(cap);
889 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
890 *pos++ = WLAN_EID_HT_CAPABILITY;
891 *pos++ = sizeof(struct ieee80211_ht_cap);
892 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
893 memcpy(pos, &tmp, sizeof(u16));
894 pos += sizeof(u16);
895 /* TODO: needs a define here for << 2 */
896 *pos++ = sband->ht_info.ampdu_factor |
897 (sband->ht_info.ampdu_density << 2);
898 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
899 }
900
901 kfree(ifsta->assocreq_ies);
902 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
903 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
904 if (ifsta->assocreq_ies)
905 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
906
907 ieee80211_sta_tx(dev, skb, 0);
908 }
909
910
911 static void ieee80211_send_deauth(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 deauth "
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_DEAUTH);
933 skb_put(skb, 2);
934 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
935
936 ieee80211_sta_tx(dev, skb, 0);
937 }
938
939
940 static void ieee80211_send_disassoc(struct net_device *dev,
941 struct ieee80211_if_sta *ifsta, u16 reason)
942 {
943 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
944 struct sk_buff *skb;
945 struct ieee80211_mgmt *mgmt;
946
947 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
948 if (!skb) {
949 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
950 "frame\n", dev->name);
951 return;
952 }
953 skb_reserve(skb, local->hw.extra_tx_headroom);
954
955 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
956 memset(mgmt, 0, 24);
957 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
958 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
959 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
960 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
961 IEEE80211_STYPE_DISASSOC);
962 skb_put(skb, 2);
963 mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
964
965 ieee80211_sta_tx(dev, skb, 0);
966 }
967
968
969 static int ieee80211_privacy_mismatch(struct net_device *dev,
970 struct ieee80211_if_sta *ifsta)
971 {
972 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
973 struct ieee80211_sta_bss *bss;
974 int bss_privacy;
975 int wep_privacy;
976 int privacy_invoked;
977
978 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
979 return 0;
980
981 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
982 local->hw.conf.channel->center_freq,
983 ifsta->ssid, ifsta->ssid_len);
984 if (!bss)
985 return 0;
986
987 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
988 wep_privacy = !!ieee80211_sta_wep_configured(dev);
989 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
990
991 ieee80211_rx_bss_put(local, bss);
992
993 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
994 return 0;
995
996 return 1;
997 }
998
999
1000 static void ieee80211_associate(struct net_device *dev,
1001 struct ieee80211_if_sta *ifsta)
1002 {
1003 DECLARE_MAC_BUF(mac);
1004
1005 ifsta->assoc_tries++;
1006 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1007 printk(KERN_DEBUG "%s: association with AP %s"
1008 " timed out\n",
1009 dev->name, print_mac(mac, ifsta->bssid));
1010 ifsta->state = IEEE80211_DISABLED;
1011 return;
1012 }
1013
1014 ifsta->state = IEEE80211_ASSOCIATE;
1015 printk(KERN_DEBUG "%s: associate with AP %s\n",
1016 dev->name, print_mac(mac, ifsta->bssid));
1017 if (ieee80211_privacy_mismatch(dev, ifsta)) {
1018 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1019 "mixed-cell disabled - abort association\n", dev->name);
1020 ifsta->state = IEEE80211_DISABLED;
1021 return;
1022 }
1023
1024 ieee80211_send_assoc(dev, ifsta);
1025
1026 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1027 }
1028
1029
1030 static void ieee80211_associated(struct net_device *dev,
1031 struct ieee80211_if_sta *ifsta)
1032 {
1033 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1034 struct sta_info *sta;
1035 int disassoc;
1036 DECLARE_MAC_BUF(mac);
1037
1038 /* TODO: start monitoring current AP signal quality and number of
1039 * missed beacons. Scan other channels every now and then and search
1040 * for better APs. */
1041 /* TODO: remove expired BSSes */
1042
1043 ifsta->state = IEEE80211_ASSOCIATED;
1044
1045 rcu_read_lock();
1046
1047 sta = sta_info_get(local, ifsta->bssid);
1048 if (!sta) {
1049 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
1050 dev->name, print_mac(mac, ifsta->bssid));
1051 disassoc = 1;
1052 } else {
1053 disassoc = 0;
1054 if (time_after(jiffies,
1055 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1056 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1057 printk(KERN_DEBUG "%s: No ProbeResp from "
1058 "current AP %s - assume out of "
1059 "range\n",
1060 dev->name, print_mac(mac, ifsta->bssid));
1061 disassoc = 1;
1062 sta_info_unlink(&sta);
1063 } else
1064 ieee80211_send_probe_req(dev, ifsta->bssid,
1065 local->scan_ssid,
1066 local->scan_ssid_len);
1067 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1068 } else {
1069 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1070 if (time_after(jiffies, ifsta->last_probe +
1071 IEEE80211_PROBE_INTERVAL)) {
1072 ifsta->last_probe = jiffies;
1073 ieee80211_send_probe_req(dev, ifsta->bssid,
1074 ifsta->ssid,
1075 ifsta->ssid_len);
1076 }
1077 }
1078 }
1079
1080 rcu_read_unlock();
1081
1082 if (disassoc && sta)
1083 sta_info_destroy(sta);
1084
1085 if (disassoc) {
1086 ifsta->state = IEEE80211_DISABLED;
1087 ieee80211_set_associated(dev, ifsta, 0);
1088 } else {
1089 mod_timer(&ifsta->timer, jiffies +
1090 IEEE80211_MONITORING_INTERVAL);
1091 }
1092 }
1093
1094
1095 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
1096 u8 *ssid, size_t ssid_len)
1097 {
1098 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1099 struct ieee80211_supported_band *sband;
1100 struct sk_buff *skb;
1101 struct ieee80211_mgmt *mgmt;
1102 u8 *pos, *supp_rates, *esupp_rates = NULL;
1103 int i;
1104
1105 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
1106 if (!skb) {
1107 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1108 "request\n", dev->name);
1109 return;
1110 }
1111 skb_reserve(skb, local->hw.extra_tx_headroom);
1112
1113 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1114 memset(mgmt, 0, 24);
1115 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1116 IEEE80211_STYPE_PROBE_REQ);
1117 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1118 if (dst) {
1119 memcpy(mgmt->da, dst, ETH_ALEN);
1120 memcpy(mgmt->bssid, dst, ETH_ALEN);
1121 } else {
1122 memset(mgmt->da, 0xff, ETH_ALEN);
1123 memset(mgmt->bssid, 0xff, ETH_ALEN);
1124 }
1125 pos = skb_put(skb, 2 + ssid_len);
1126 *pos++ = WLAN_EID_SSID;
1127 *pos++ = ssid_len;
1128 memcpy(pos, ssid, ssid_len);
1129
1130 supp_rates = skb_put(skb, 2);
1131 supp_rates[0] = WLAN_EID_SUPP_RATES;
1132 supp_rates[1] = 0;
1133 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1134
1135 for (i = 0; i < sband->n_bitrates; i++) {
1136 struct ieee80211_rate *rate = &sband->bitrates[i];
1137 if (esupp_rates) {
1138 pos = skb_put(skb, 1);
1139 esupp_rates[1]++;
1140 } else if (supp_rates[1] == 8) {
1141 esupp_rates = skb_put(skb, 3);
1142 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
1143 esupp_rates[1] = 1;
1144 pos = &esupp_rates[2];
1145 } else {
1146 pos = skb_put(skb, 1);
1147 supp_rates[1]++;
1148 }
1149 *pos = rate->bitrate / 5;
1150 }
1151
1152 ieee80211_sta_tx(dev, skb, 0);
1153 }
1154
1155
1156 static int ieee80211_sta_wep_configured(struct net_device *dev)
1157 {
1158 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1159 if (!sdata || !sdata->default_key ||
1160 sdata->default_key->conf.alg != ALG_WEP)
1161 return 0;
1162 return 1;
1163 }
1164
1165
1166 static void ieee80211_auth_completed(struct net_device *dev,
1167 struct ieee80211_if_sta *ifsta)
1168 {
1169 printk(KERN_DEBUG "%s: authenticated\n", dev->name);
1170 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1171 ieee80211_associate(dev, ifsta);
1172 }
1173
1174
1175 static void ieee80211_auth_challenge(struct net_device *dev,
1176 struct ieee80211_if_sta *ifsta,
1177 struct ieee80211_mgmt *mgmt,
1178 size_t len)
1179 {
1180 u8 *pos;
1181 struct ieee802_11_elems elems;
1182
1183 pos = mgmt->u.auth.variable;
1184 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1185 if (!elems.challenge)
1186 return;
1187 ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
1188 elems.challenge_len + 2, 1);
1189 }
1190
1191 static void ieee80211_send_addba_resp(struct net_device *dev, u8 *da, u16 tid,
1192 u8 dialog_token, u16 status, u16 policy,
1193 u16 buf_size, u16 timeout)
1194 {
1195 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1196 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1197 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1198 struct sk_buff *skb;
1199 struct ieee80211_mgmt *mgmt;
1200 u16 capab;
1201
1202 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1203
1204 if (!skb) {
1205 printk(KERN_DEBUG "%s: failed to allocate buffer "
1206 "for addba resp frame\n", dev->name);
1207 return;
1208 }
1209
1210 skb_reserve(skb, local->hw.extra_tx_headroom);
1211 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1212 memset(mgmt, 0, 24);
1213 memcpy(mgmt->da, da, ETH_ALEN);
1214 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1215 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1216 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1217 else
1218 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1219 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1220 IEEE80211_STYPE_ACTION);
1221
1222 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
1223 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1224 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
1225 mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
1226
1227 capab = (u16)(policy << 1); /* bit 1 aggregation policy */
1228 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1229 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
1230
1231 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
1232 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
1233 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
1234
1235 ieee80211_sta_tx(dev, skb, 0);
1236
1237 return;
1238 }
1239
1240 void ieee80211_send_addba_request(struct net_device *dev, const u8 *da,
1241 u16 tid, u8 dialog_token, u16 start_seq_num,
1242 u16 agg_size, u16 timeout)
1243 {
1244 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1245 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1246 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1247 struct sk_buff *skb;
1248 struct ieee80211_mgmt *mgmt;
1249 u16 capab;
1250
1251 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1252
1253 if (!skb) {
1254 printk(KERN_ERR "%s: failed to allocate buffer "
1255 "for addba request frame\n", dev->name);
1256 return;
1257 }
1258 skb_reserve(skb, local->hw.extra_tx_headroom);
1259 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1260 memset(mgmt, 0, 24);
1261 memcpy(mgmt->da, da, ETH_ALEN);
1262 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1263 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1264 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1265 else
1266 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1267
1268 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1269 IEEE80211_STYPE_ACTION);
1270
1271 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
1272
1273 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1274 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
1275
1276 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
1277 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
1278 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1279 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
1280
1281 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
1282
1283 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
1284 mgmt->u.action.u.addba_req.start_seq_num =
1285 cpu_to_le16(start_seq_num << 4);
1286
1287 ieee80211_sta_tx(dev, skb, 0);
1288 }
1289
1290 static void ieee80211_sta_process_addba_request(struct net_device *dev,
1291 struct ieee80211_mgmt *mgmt,
1292 size_t len)
1293 {
1294 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1295 struct ieee80211_hw *hw = &local->hw;
1296 struct ieee80211_conf *conf = &hw->conf;
1297 struct sta_info *sta;
1298 struct tid_ampdu_rx *tid_agg_rx;
1299 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
1300 u8 dialog_token;
1301 int ret = -EOPNOTSUPP;
1302 DECLARE_MAC_BUF(mac);
1303
1304 rcu_read_lock();
1305
1306 sta = sta_info_get(local, mgmt->sa);
1307 if (!sta) {
1308 rcu_read_unlock();
1309 return;
1310 }
1311
1312 /* extract session parameters from addba request frame */
1313 dialog_token = mgmt->u.action.u.addba_req.dialog_token;
1314 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
1315 start_seq_num =
1316 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
1317
1318 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
1319 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
1320 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1321 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
1322
1323 status = WLAN_STATUS_REQUEST_DECLINED;
1324
1325 /* sanity check for incoming parameters:
1326 * check if configuration can support the BA policy
1327 * and if buffer size does not exceeds max value */
1328 if (((ba_policy != 1)
1329 && (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA)))
1330 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
1331 status = WLAN_STATUS_INVALID_QOS_PARAM;
1332 #ifdef CONFIG_MAC80211_HT_DEBUG
1333 if (net_ratelimit())
1334 printk(KERN_DEBUG "AddBA Req with bad params from "
1335 "%s on tid %u. policy %d, buffer size %d\n",
1336 print_mac(mac, mgmt->sa), tid, ba_policy,
1337 buf_size);
1338 #endif /* CONFIG_MAC80211_HT_DEBUG */
1339 goto end_no_lock;
1340 }
1341 /* determine default buffer size */
1342 if (buf_size == 0) {
1343 struct ieee80211_supported_band *sband;
1344
1345 sband = local->hw.wiphy->bands[conf->channel->band];
1346 buf_size = IEEE80211_MIN_AMPDU_BUF;
1347 buf_size = buf_size << sband->ht_info.ampdu_factor;
1348 }
1349
1350
1351 /* examine state machine */
1352 spin_lock_bh(&sta->lock);
1353
1354 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
1355 #ifdef CONFIG_MAC80211_HT_DEBUG
1356 if (net_ratelimit())
1357 printk(KERN_DEBUG "unexpected AddBA Req from "
1358 "%s on tid %u\n",
1359 print_mac(mac, mgmt->sa), tid);
1360 #endif /* CONFIG_MAC80211_HT_DEBUG */
1361 goto end;
1362 }
1363
1364 /* prepare A-MPDU MLME for Rx aggregation */
1365 sta->ampdu_mlme.tid_rx[tid] =
1366 kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
1367 if (!sta->ampdu_mlme.tid_rx[tid]) {
1368 #ifdef CONFIG_MAC80211_HT_DEBUG
1369 if (net_ratelimit())
1370 printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
1371 tid);
1372 #endif
1373 goto end;
1374 }
1375 /* rx timer */
1376 sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
1377 sta_rx_agg_session_timer_expired;
1378 sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
1379 (unsigned long)&sta->timer_to_tid[tid];
1380 init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1381
1382 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
1383
1384 /* prepare reordering buffer */
1385 tid_agg_rx->reorder_buf =
1386 kmalloc(buf_size * sizeof(struct sk_buff *), GFP_ATOMIC);
1387 if (!tid_agg_rx->reorder_buf) {
1388 #ifdef CONFIG_MAC80211_HT_DEBUG
1389 if (net_ratelimit())
1390 printk(KERN_ERR "can not allocate reordering buffer "
1391 "to tid %d\n", tid);
1392 #endif
1393 kfree(sta->ampdu_mlme.tid_rx[tid]);
1394 goto end;
1395 }
1396 memset(tid_agg_rx->reorder_buf, 0,
1397 buf_size * sizeof(struct sk_buff *));
1398
1399 if (local->ops->ampdu_action)
1400 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
1401 sta->addr, tid, &start_seq_num);
1402 #ifdef CONFIG_MAC80211_HT_DEBUG
1403 printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
1404 #endif /* CONFIG_MAC80211_HT_DEBUG */
1405
1406 if (ret) {
1407 kfree(tid_agg_rx->reorder_buf);
1408 kfree(tid_agg_rx);
1409 sta->ampdu_mlme.tid_rx[tid] = NULL;
1410 goto end;
1411 }
1412
1413 /* change state and send addba resp */
1414 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
1415 tid_agg_rx->dialog_token = dialog_token;
1416 tid_agg_rx->ssn = start_seq_num;
1417 tid_agg_rx->head_seq_num = start_seq_num;
1418 tid_agg_rx->buf_size = buf_size;
1419 tid_agg_rx->timeout = timeout;
1420 tid_agg_rx->stored_mpdu_num = 0;
1421 status = WLAN_STATUS_SUCCESS;
1422 end:
1423 spin_unlock_bh(&sta->lock);
1424
1425 end_no_lock:
1426 ieee80211_send_addba_resp(sta->sdata->dev, sta->addr, tid,
1427 dialog_token, status, 1, buf_size, timeout);
1428 rcu_read_unlock();
1429 }
1430
1431 static void ieee80211_sta_process_addba_resp(struct net_device *dev,
1432 struct ieee80211_mgmt *mgmt,
1433 size_t len)
1434 {
1435 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1436 struct ieee80211_hw *hw = &local->hw;
1437 struct sta_info *sta;
1438 u16 capab;
1439 u16 tid;
1440 u8 *state;
1441
1442 rcu_read_lock();
1443
1444 sta = sta_info_get(local, mgmt->sa);
1445 if (!sta) {
1446 rcu_read_unlock();
1447 return;
1448 }
1449
1450 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
1451 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1452
1453 state = &sta->ampdu_mlme.tid_state_tx[tid];
1454
1455 spin_lock_bh(&sta->lock);
1456
1457 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1458 spin_unlock_bh(&sta->lock);
1459 goto addba_resp_exit;
1460 }
1461
1462 if (mgmt->u.action.u.addba_resp.dialog_token !=
1463 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
1464 spin_unlock_bh(&sta->lock);
1465 #ifdef CONFIG_MAC80211_HT_DEBUG
1466 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
1467 #endif /* CONFIG_MAC80211_HT_DEBUG */
1468 goto addba_resp_exit;
1469 }
1470
1471 del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
1472 #ifdef CONFIG_MAC80211_HT_DEBUG
1473 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
1474 #endif /* CONFIG_MAC80211_HT_DEBUG */
1475 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
1476 == WLAN_STATUS_SUCCESS) {
1477 *state |= HT_ADDBA_RECEIVED_MSK;
1478 sta->ampdu_mlme.addba_req_num[tid] = 0;
1479
1480 if (*state == HT_AGG_STATE_OPERATIONAL)
1481 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
1482
1483 spin_unlock_bh(&sta->lock);
1484 } else {
1485 sta->ampdu_mlme.addba_req_num[tid]++;
1486 /* this will allow the state check in stop_BA_session */
1487 *state = HT_AGG_STATE_OPERATIONAL;
1488 spin_unlock_bh(&sta->lock);
1489 ieee80211_stop_tx_ba_session(hw, sta->addr, tid,
1490 WLAN_BACK_INITIATOR);
1491 }
1492
1493 addba_resp_exit:
1494 rcu_read_unlock();
1495 }
1496
1497 void ieee80211_send_delba(struct net_device *dev, const u8 *da, u16 tid,
1498 u16 initiator, u16 reason_code)
1499 {
1500 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1501 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1502 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1503 struct sk_buff *skb;
1504 struct ieee80211_mgmt *mgmt;
1505 u16 params;
1506
1507 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1508
1509 if (!skb) {
1510 printk(KERN_ERR "%s: failed to allocate buffer "
1511 "for delba frame\n", dev->name);
1512 return;
1513 }
1514
1515 skb_reserve(skb, local->hw.extra_tx_headroom);
1516 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1517 memset(mgmt, 0, 24);
1518 memcpy(mgmt->da, da, ETH_ALEN);
1519 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1520 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1521 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1522 else
1523 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1524 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1525 IEEE80211_STYPE_ACTION);
1526
1527 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
1528
1529 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1530 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
1531 params = (u16)(initiator << 11); /* bit 11 initiator */
1532 params |= (u16)(tid << 12); /* bit 15:12 TID number */
1533
1534 mgmt->u.action.u.delba.params = cpu_to_le16(params);
1535 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
1536
1537 ieee80211_sta_tx(dev, skb, 0);
1538 }
1539
1540 void ieee80211_send_bar(struct net_device *dev, u8 *ra, u16 tid, u16 ssn)
1541 {
1542 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1543 struct sk_buff *skb;
1544 struct ieee80211_bar *bar;
1545 u16 bar_control = 0;
1546
1547 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
1548 if (!skb) {
1549 printk(KERN_ERR "%s: failed to allocate buffer for "
1550 "bar frame\n", dev->name);
1551 return;
1552 }
1553 skb_reserve(skb, local->hw.extra_tx_headroom);
1554 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
1555 memset(bar, 0, sizeof(*bar));
1556 bar->frame_control = IEEE80211_FC(IEEE80211_FTYPE_CTL,
1557 IEEE80211_STYPE_BACK_REQ);
1558 memcpy(bar->ra, ra, ETH_ALEN);
1559 memcpy(bar->ta, dev->dev_addr, ETH_ALEN);
1560 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
1561 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
1562 bar_control |= (u16)(tid << 12);
1563 bar->control = cpu_to_le16(bar_control);
1564 bar->start_seq_num = cpu_to_le16(ssn);
1565
1566 ieee80211_sta_tx(dev, skb, 0);
1567 }
1568
1569 void ieee80211_sta_stop_rx_ba_session(struct net_device *dev, u8 *ra, u16 tid,
1570 u16 initiator, u16 reason)
1571 {
1572 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1573 struct ieee80211_hw *hw = &local->hw;
1574 struct sta_info *sta;
1575 int ret, i;
1576 DECLARE_MAC_BUF(mac);
1577
1578 rcu_read_lock();
1579
1580 sta = sta_info_get(local, ra);
1581 if (!sta) {
1582 rcu_read_unlock();
1583 return;
1584 }
1585
1586 /* check if TID is in operational state */
1587 spin_lock_bh(&sta->lock);
1588 if (sta->ampdu_mlme.tid_state_rx[tid]
1589 != HT_AGG_STATE_OPERATIONAL) {
1590 spin_unlock_bh(&sta->lock);
1591 rcu_read_unlock();
1592 return;
1593 }
1594 sta->ampdu_mlme.tid_state_rx[tid] =
1595 HT_AGG_STATE_REQ_STOP_BA_MSK |
1596 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
1597 spin_unlock_bh(&sta->lock);
1598
1599 /* stop HW Rx aggregation. ampdu_action existence
1600 * already verified in session init so we add the BUG_ON */
1601 BUG_ON(!local->ops->ampdu_action);
1602
1603 #ifdef CONFIG_MAC80211_HT_DEBUG
1604 printk(KERN_DEBUG "Rx BA session stop requested for %s tid %u\n",
1605 print_mac(mac, ra), tid);
1606 #endif /* CONFIG_MAC80211_HT_DEBUG */
1607
1608 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
1609 ra, tid, NULL);
1610 if (ret)
1611 printk(KERN_DEBUG "HW problem - can not stop rx "
1612 "aggregation for tid %d\n", tid);
1613
1614 /* shutdown timer has not expired */
1615 if (initiator != WLAN_BACK_TIMER)
1616 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1617
1618 /* check if this is a self generated aggregation halt */
1619 if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
1620 ieee80211_send_delba(dev, ra, tid, 0, reason);
1621
1622 /* free the reordering buffer */
1623 for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
1624 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
1625 /* release the reordered frames */
1626 dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
1627 sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
1628 sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
1629 }
1630 }
1631 /* free resources */
1632 kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
1633 kfree(sta->ampdu_mlme.tid_rx[tid]);
1634 sta->ampdu_mlme.tid_rx[tid] = NULL;
1635 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
1636
1637 rcu_read_unlock();
1638 }
1639
1640
1641 static void ieee80211_sta_process_delba(struct net_device *dev,
1642 struct ieee80211_mgmt *mgmt, size_t len)
1643 {
1644 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1645 struct sta_info *sta;
1646 u16 tid, params;
1647 u16 initiator;
1648 DECLARE_MAC_BUF(mac);
1649
1650 rcu_read_lock();
1651
1652 sta = sta_info_get(local, mgmt->sa);
1653 if (!sta) {
1654 rcu_read_unlock();
1655 return;
1656 }
1657
1658 params = le16_to_cpu(mgmt->u.action.u.delba.params);
1659 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
1660 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
1661
1662 #ifdef CONFIG_MAC80211_HT_DEBUG
1663 if (net_ratelimit())
1664 printk(KERN_DEBUG "delba from %s (%s) tid %d reason code %d\n",
1665 print_mac(mac, mgmt->sa),
1666 initiator ? "initiator" : "recipient", tid,
1667 mgmt->u.action.u.delba.reason_code);
1668 #endif /* CONFIG_MAC80211_HT_DEBUG */
1669
1670 if (initiator == WLAN_BACK_INITIATOR)
1671 ieee80211_sta_stop_rx_ba_session(dev, sta->addr, tid,
1672 WLAN_BACK_INITIATOR, 0);
1673 else { /* WLAN_BACK_RECIPIENT */
1674 spin_lock_bh(&sta->lock);
1675 sta->ampdu_mlme.tid_state_tx[tid] =
1676 HT_AGG_STATE_OPERATIONAL;
1677 spin_unlock_bh(&sta->lock);
1678 ieee80211_stop_tx_ba_session(&local->hw, sta->addr, tid,
1679 WLAN_BACK_RECIPIENT);
1680 }
1681 rcu_read_unlock();
1682 }
1683
1684 /*
1685 * After sending add Block Ack request we activated a timer until
1686 * add Block Ack response will arrive from the recipient.
1687 * If this timer expires sta_addba_resp_timer_expired will be executed.
1688 */
1689 void sta_addba_resp_timer_expired(unsigned long data)
1690 {
1691 /* not an elegant detour, but there is no choice as the timer passes
1692 * only one argument, and both sta_info and TID are needed, so init
1693 * flow in sta_info_create gives the TID as data, while the timer_to_id
1694 * array gives the sta through container_of */
1695 u16 tid = *(u8 *)data;
1696 struct sta_info *temp_sta = container_of((void *)data,
1697 struct sta_info, timer_to_tid[tid]);
1698
1699 struct ieee80211_local *local = temp_sta->local;
1700 struct ieee80211_hw *hw = &local->hw;
1701 struct sta_info *sta;
1702 u8 *state;
1703
1704 rcu_read_lock();
1705
1706 sta = sta_info_get(local, temp_sta->addr);
1707 if (!sta) {
1708 rcu_read_unlock();
1709 return;
1710 }
1711
1712 state = &sta->ampdu_mlme.tid_state_tx[tid];
1713 /* check if the TID waits for addBA response */
1714 spin_lock_bh(&sta->lock);
1715 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1716 spin_unlock_bh(&sta->lock);
1717 *state = HT_AGG_STATE_IDLE;
1718 #ifdef CONFIG_MAC80211_HT_DEBUG
1719 printk(KERN_DEBUG "timer expired on tid %d but we are not "
1720 "expecting addBA response there", tid);
1721 #endif
1722 goto timer_expired_exit;
1723 }
1724
1725 #ifdef CONFIG_MAC80211_HT_DEBUG
1726 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
1727 #endif
1728
1729 /* go through the state check in stop_BA_session */
1730 *state = HT_AGG_STATE_OPERATIONAL;
1731 spin_unlock_bh(&sta->lock);
1732 ieee80211_stop_tx_ba_session(hw, temp_sta->addr, tid,
1733 WLAN_BACK_INITIATOR);
1734
1735 timer_expired_exit:
1736 rcu_read_unlock();
1737 }
1738
1739 /*
1740 * After accepting the AddBA Request we activated a timer,
1741 * resetting it after each frame that arrives from the originator.
1742 * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
1743 */
1744 static void sta_rx_agg_session_timer_expired(unsigned long data)
1745 {
1746 /* not an elegant detour, but there is no choice as the timer passes
1747 * only one argument, and various sta_info are needed here, so init
1748 * flow in sta_info_create gives the TID as data, while the timer_to_id
1749 * array gives the sta through container_of */
1750 u8 *ptid = (u8 *)data;
1751 u8 *timer_to_id = ptid - *ptid;
1752 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
1753 timer_to_tid[0]);
1754
1755 #ifdef CONFIG_MAC80211_HT_DEBUG
1756 printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
1757 #endif
1758 ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr,
1759 (u16)*ptid, WLAN_BACK_TIMER,
1760 WLAN_REASON_QSTA_TIMEOUT);
1761 }
1762
1763 void ieee80211_sta_tear_down_BA_sessions(struct net_device *dev, u8 *addr)
1764 {
1765 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1766 int i;
1767
1768 for (i = 0; i < STA_TID_NUM; i++) {
1769 ieee80211_stop_tx_ba_session(&local->hw, addr, i,
1770 WLAN_BACK_INITIATOR);
1771 ieee80211_sta_stop_rx_ba_session(dev, addr, i,
1772 WLAN_BACK_RECIPIENT,
1773 WLAN_REASON_QSTA_LEAVE_QBSS);
1774 }
1775 }
1776
1777 static void ieee80211_send_refuse_measurement_request(struct net_device *dev,
1778 struct ieee80211_msrment_ie *request_ie,
1779 const u8 *da, const u8 *bssid,
1780 u8 dialog_token)
1781 {
1782 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1783 struct sk_buff *skb;
1784 struct ieee80211_mgmt *msr_report;
1785
1786 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
1787 sizeof(struct ieee80211_msrment_ie));
1788
1789 if (!skb) {
1790 printk(KERN_ERR "%s: failed to allocate buffer for "
1791 "measurement report frame\n", dev->name);
1792 return;
1793 }
1794
1795 skb_reserve(skb, local->hw.extra_tx_headroom);
1796 msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
1797 memset(msr_report, 0, 24);
1798 memcpy(msr_report->da, da, ETH_ALEN);
1799 memcpy(msr_report->sa, dev->dev_addr, ETH_ALEN);
1800 memcpy(msr_report->bssid, bssid, ETH_ALEN);
1801 msr_report->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1802 IEEE80211_STYPE_ACTION);
1803
1804 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
1805 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
1806 msr_report->u.action.u.measurement.action_code =
1807 WLAN_ACTION_SPCT_MSR_RPRT;
1808 msr_report->u.action.u.measurement.dialog_token = dialog_token;
1809
1810 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
1811 msr_report->u.action.u.measurement.length =
1812 sizeof(struct ieee80211_msrment_ie);
1813
1814 memset(&msr_report->u.action.u.measurement.msr_elem, 0,
1815 sizeof(struct ieee80211_msrment_ie));
1816 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
1817 msr_report->u.action.u.measurement.msr_elem.mode |=
1818 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
1819 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
1820
1821 ieee80211_sta_tx(dev, skb, 0);
1822 }
1823
1824 static void ieee80211_sta_process_measurement_req(struct net_device *dev,
1825 struct ieee80211_mgmt *mgmt,
1826 size_t len)
1827 {
1828 /*
1829 * Ignoring measurement request is spec violation.
1830 * Mandatory measurements must be reported optional
1831 * measurements might be refused or reported incapable
1832 * For now just refuse
1833 * TODO: Answer basic measurement as unmeasured
1834 */
1835 ieee80211_send_refuse_measurement_request(dev,
1836 &mgmt->u.action.u.measurement.msr_elem,
1837 mgmt->sa, mgmt->bssid,
1838 mgmt->u.action.u.measurement.dialog_token);
1839 }
1840
1841
1842 static void ieee80211_rx_mgmt_auth(struct net_device *dev,
1843 struct ieee80211_if_sta *ifsta,
1844 struct ieee80211_mgmt *mgmt,
1845 size_t len)
1846 {
1847 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1848 u16 auth_alg, auth_transaction, status_code;
1849 DECLARE_MAC_BUF(mac);
1850
1851 if (ifsta->state != IEEE80211_AUTHENTICATE &&
1852 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1853 return;
1854
1855 if (len < 24 + 6)
1856 return;
1857
1858 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1859 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1860 return;
1861
1862 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1863 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1864 return;
1865
1866 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1867 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1868 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1869
1870 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1871 /*
1872 * IEEE 802.11 standard does not require authentication in IBSS
1873 * networks and most implementations do not seem to use it.
1874 * However, try to reply to authentication attempts if someone
1875 * has actually implemented this.
1876 */
1877 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1878 return;
1879 ieee80211_send_auth(dev, ifsta, 2, NULL, 0, 0);
1880 }
1881
1882 if (auth_alg != ifsta->auth_alg ||
1883 auth_transaction != ifsta->auth_transaction)
1884 return;
1885
1886 if (status_code != WLAN_STATUS_SUCCESS) {
1887 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1888 u8 algs[3];
1889 const int num_algs = ARRAY_SIZE(algs);
1890 int i, pos;
1891 algs[0] = algs[1] = algs[2] = 0xff;
1892 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1893 algs[0] = WLAN_AUTH_OPEN;
1894 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1895 algs[1] = WLAN_AUTH_SHARED_KEY;
1896 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1897 algs[2] = WLAN_AUTH_LEAP;
1898 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1899 pos = 0;
1900 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1901 pos = 1;
1902 else
1903 pos = 2;
1904 for (i = 0; i < num_algs; i++) {
1905 pos++;
1906 if (pos >= num_algs)
1907 pos = 0;
1908 if (algs[pos] == ifsta->auth_alg ||
1909 algs[pos] == 0xff)
1910 continue;
1911 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1912 !ieee80211_sta_wep_configured(dev))
1913 continue;
1914 ifsta->auth_alg = algs[pos];
1915 break;
1916 }
1917 }
1918 return;
1919 }
1920
1921 switch (ifsta->auth_alg) {
1922 case WLAN_AUTH_OPEN:
1923 case WLAN_AUTH_LEAP:
1924 ieee80211_auth_completed(dev, ifsta);
1925 break;
1926 case WLAN_AUTH_SHARED_KEY:
1927 if (ifsta->auth_transaction == 4)
1928 ieee80211_auth_completed(dev, ifsta);
1929 else
1930 ieee80211_auth_challenge(dev, ifsta, mgmt, len);
1931 break;
1932 }
1933 }
1934
1935
1936 static void ieee80211_rx_mgmt_deauth(struct net_device *dev,
1937 struct ieee80211_if_sta *ifsta,
1938 struct ieee80211_mgmt *mgmt,
1939 size_t len)
1940 {
1941 u16 reason_code;
1942 DECLARE_MAC_BUF(mac);
1943
1944 if (len < 24 + 2)
1945 return;
1946
1947 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1948 return;
1949
1950 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1951
1952 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1953 printk(KERN_DEBUG "%s: deauthenticated\n", dev->name);
1954
1955 if (ifsta->state == IEEE80211_AUTHENTICATE ||
1956 ifsta->state == IEEE80211_ASSOCIATE ||
1957 ifsta->state == IEEE80211_ASSOCIATED) {
1958 ifsta->state = IEEE80211_AUTHENTICATE;
1959 mod_timer(&ifsta->timer, jiffies +
1960 IEEE80211_RETRY_AUTH_INTERVAL);
1961 }
1962
1963 ieee80211_set_disassoc(dev, ifsta, 1);
1964 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1965 }
1966
1967
1968 static void ieee80211_rx_mgmt_disassoc(struct net_device *dev,
1969 struct ieee80211_if_sta *ifsta,
1970 struct ieee80211_mgmt *mgmt,
1971 size_t len)
1972 {
1973 u16 reason_code;
1974 DECLARE_MAC_BUF(mac);
1975
1976 if (len < 24 + 2)
1977 return;
1978
1979 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1980 return;
1981
1982 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1983
1984 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1985 printk(KERN_DEBUG "%s: disassociated\n", dev->name);
1986
1987 if (ifsta->state == IEEE80211_ASSOCIATED) {
1988 ifsta->state = IEEE80211_ASSOCIATE;
1989 mod_timer(&ifsta->timer, jiffies +
1990 IEEE80211_RETRY_AUTH_INTERVAL);
1991 }
1992
1993 ieee80211_set_disassoc(dev, ifsta, 0);
1994 }
1995
1996
1997 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1998 struct ieee80211_if_sta *ifsta,
1999 struct ieee80211_mgmt *mgmt,
2000 size_t len,
2001 int reassoc)
2002 {
2003 struct ieee80211_local *local = sdata->local;
2004 struct net_device *dev = sdata->dev;
2005 struct ieee80211_supported_band *sband;
2006 struct sta_info *sta;
2007 u64 rates, basic_rates;
2008 u16 capab_info, status_code, aid;
2009 struct ieee802_11_elems elems;
2010 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
2011 u8 *pos;
2012 int i, j;
2013 DECLARE_MAC_BUF(mac);
2014 bool have_higher_than_11mbit = false;
2015
2016 /* AssocResp and ReassocResp have identical structure, so process both
2017 * of them in this function. */
2018
2019 if (ifsta->state != IEEE80211_ASSOCIATE)
2020 return;
2021
2022 if (len < 24 + 6)
2023 return;
2024
2025 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
2026 return;
2027
2028 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2029 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2030 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2031
2032 printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
2033 "status=%d aid=%d)\n",
2034 dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
2035 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2036
2037 if (status_code != WLAN_STATUS_SUCCESS) {
2038 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
2039 dev->name, status_code);
2040 /* if this was a reassociation, ensure we try a "full"
2041 * association next time. This works around some broken APs
2042 * which do not correctly reject reassociation requests. */
2043 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2044 return;
2045 }
2046
2047 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2048 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
2049 "set\n", dev->name, aid);
2050 aid &= ~(BIT(15) | BIT(14));
2051
2052 pos = mgmt->u.assoc_resp.variable;
2053 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2054
2055 if (!elems.supp_rates) {
2056 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2057 dev->name);
2058 return;
2059 }
2060
2061 printk(KERN_DEBUG "%s: associated\n", dev->name);
2062 ifsta->aid = aid;
2063 ifsta->ap_capab = capab_info;
2064
2065 kfree(ifsta->assocresp_ies);
2066 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
2067 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
2068 if (ifsta->assocresp_ies)
2069 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
2070
2071 rcu_read_lock();
2072
2073 /* Add STA entry for the AP */
2074 sta = sta_info_get(local, ifsta->bssid);
2075 if (!sta) {
2076 struct ieee80211_sta_bss *bss;
2077 int err;
2078
2079 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
2080 if (!sta) {
2081 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
2082 " the AP\n", dev->name);
2083 rcu_read_unlock();
2084 return;
2085 }
2086 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
2087 local->hw.conf.channel->center_freq,
2088 ifsta->ssid, ifsta->ssid_len);
2089 if (bss) {
2090 sta->last_signal = bss->signal;
2091 sta->last_qual = bss->qual;
2092 sta->last_noise = bss->noise;
2093 ieee80211_rx_bss_put(local, bss);
2094 }
2095
2096 err = sta_info_insert(sta);
2097 if (err) {
2098 printk(KERN_DEBUG "%s: failed to insert STA entry for"
2099 " the AP (error %d)\n", dev->name, err);
2100 rcu_read_unlock();
2101 return;
2102 }
2103 }
2104
2105 /*
2106 * FIXME: Do we really need to update the sta_info's information here?
2107 * We already know about the AP (we found it in our list) so it
2108 * should already be filled with the right info, no?
2109 * As is stands, all this is racy because typically we assume
2110 * the information that is filled in here (except flags) doesn't
2111 * change while a STA structure is alive. As such, it should move
2112 * to between the sta_info_alloc() and sta_info_insert() above.
2113 */
2114
2115 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
2116 WLAN_STA_AUTHORIZED);
2117
2118 rates = 0;
2119 basic_rates = 0;
2120 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2121
2122 for (i = 0; i < elems.supp_rates_len; i++) {
2123 int rate = (elems.supp_rates[i] & 0x7f) * 5;
2124
2125 if (rate > 110)
2126 have_higher_than_11mbit = true;
2127
2128 for (j = 0; j < sband->n_bitrates; j++) {
2129 if (sband->bitrates[j].bitrate == rate)
2130 rates |= BIT(j);
2131 if (elems.supp_rates[i] & 0x80)
2132 basic_rates |= BIT(j);
2133 }
2134 }
2135
2136 for (i = 0; i < elems.ext_supp_rates_len; i++) {
2137 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
2138
2139 if (rate > 110)
2140 have_higher_than_11mbit = true;
2141
2142 for (j = 0; j < sband->n_bitrates; j++) {
2143 if (sband->bitrates[j].bitrate == rate)
2144 rates |= BIT(j);
2145 if (elems.ext_supp_rates[i] & 0x80)
2146 basic_rates |= BIT(j);
2147 }
2148 }
2149
2150 sta->supp_rates[local->hw.conf.channel->band] = rates;
2151 sdata->basic_rates = basic_rates;
2152
2153 /* cf. IEEE 802.11 9.2.12 */
2154 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
2155 have_higher_than_11mbit)
2156 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
2157 else
2158 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
2159
2160 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2161 (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
2162 struct ieee80211_ht_bss_info bss_info;
2163 ieee80211_ht_cap_ie_to_ht_info(
2164 (struct ieee80211_ht_cap *)
2165 elems.ht_cap_elem, &sta->ht_info);
2166 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2167 (struct ieee80211_ht_addt_info *)
2168 elems.ht_info_elem, &bss_info);
2169 ieee80211_handle_ht(local, 1, &sta->ht_info, &bss_info);
2170 }
2171
2172 rate_control_rate_init(sta, local);
2173
2174 if (elems.wmm_param) {
2175 set_sta_flags(sta, WLAN_STA_WME);
2176 rcu_read_unlock();
2177 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
2178 elems.wmm_param_len);
2179 } else
2180 rcu_read_unlock();
2181
2182 /* set AID and assoc capability,
2183 * ieee80211_set_associated() will tell the driver */
2184 bss_conf->aid = aid;
2185 bss_conf->assoc_capability = capab_info;
2186 ieee80211_set_associated(dev, ifsta, 1);
2187
2188 ieee80211_associated(dev, ifsta);
2189 }
2190
2191
2192 /* Caller must hold local->sta_bss_lock */
2193 static void __ieee80211_rx_bss_hash_add(struct net_device *dev,
2194 struct ieee80211_sta_bss *bss)
2195 {
2196 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2197 u8 hash_idx;
2198
2199 if (bss_mesh_cfg(bss))
2200 hash_idx = mesh_id_hash(bss_mesh_id(bss),
2201 bss_mesh_id_len(bss));
2202 else
2203 hash_idx = STA_HASH(bss->bssid);
2204
2205 bss->hnext = local->sta_bss_hash[hash_idx];
2206 local->sta_bss_hash[hash_idx] = bss;
2207 }
2208
2209
2210 /* Caller must hold local->sta_bss_lock */
2211 static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
2212 struct ieee80211_sta_bss *bss)
2213 {
2214 struct ieee80211_sta_bss *b, *prev = NULL;
2215 b = local->sta_bss_hash[STA_HASH(bss->bssid)];
2216 while (b) {
2217 if (b == bss) {
2218 if (!prev)
2219 local->sta_bss_hash[STA_HASH(bss->bssid)] =
2220 bss->hnext;
2221 else
2222 prev->hnext = bss->hnext;
2223 break;
2224 }
2225 prev = b;
2226 b = b->hnext;
2227 }
2228 }
2229
2230
2231 static struct ieee80211_sta_bss *
2232 ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int freq,
2233 u8 *ssid, u8 ssid_len)
2234 {
2235 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2236 struct ieee80211_sta_bss *bss;
2237
2238 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2239 if (!bss)
2240 return NULL;
2241 atomic_inc(&bss->users);
2242 atomic_inc(&bss->users);
2243 memcpy(bss->bssid, bssid, ETH_ALEN);
2244 bss->freq = freq;
2245 if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
2246 memcpy(bss->ssid, ssid, ssid_len);
2247 bss->ssid_len = ssid_len;
2248 }
2249
2250 spin_lock_bh(&local->sta_bss_lock);
2251 /* TODO: order by RSSI? */
2252 list_add_tail(&bss->list, &local->sta_bss_list);
2253 __ieee80211_rx_bss_hash_add(dev, bss);
2254 spin_unlock_bh(&local->sta_bss_lock);
2255 return bss;
2256 }
2257
2258 static struct ieee80211_sta_bss *
2259 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int freq,
2260 u8 *ssid, u8 ssid_len)
2261 {
2262 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2263 struct ieee80211_sta_bss *bss;
2264
2265 spin_lock_bh(&local->sta_bss_lock);
2266 bss = local->sta_bss_hash[STA_HASH(bssid)];
2267 while (bss) {
2268 if (!bss_mesh_cfg(bss) &&
2269 !memcmp(bss->bssid, bssid, ETH_ALEN) &&
2270 bss->freq == freq &&
2271 bss->ssid_len == ssid_len &&
2272 (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
2273 atomic_inc(&bss->users);
2274 break;
2275 }
2276 bss = bss->hnext;
2277 }
2278 spin_unlock_bh(&local->sta_bss_lock);
2279 return bss;
2280 }
2281
2282 #ifdef CONFIG_MAC80211_MESH
2283 static struct ieee80211_sta_bss *
2284 ieee80211_rx_mesh_bss_get(struct net_device *dev, u8 *mesh_id, int mesh_id_len,
2285 u8 *mesh_cfg, int freq)
2286 {
2287 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2288 struct ieee80211_sta_bss *bss;
2289
2290 spin_lock_bh(&local->sta_bss_lock);
2291 bss = local->sta_bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
2292 while (bss) {
2293 if (bss_mesh_cfg(bss) &&
2294 !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
2295 bss->freq == freq &&
2296 mesh_id_len == bss->mesh_id_len &&
2297 (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
2298 mesh_id_len))) {
2299 atomic_inc(&bss->users);
2300 break;
2301 }
2302 bss = bss->hnext;
2303 }
2304 spin_unlock_bh(&local->sta_bss_lock);
2305 return bss;
2306 }
2307
2308 static struct ieee80211_sta_bss *
2309 ieee80211_rx_mesh_bss_add(struct net_device *dev, u8 *mesh_id, int mesh_id_len,
2310 u8 *mesh_cfg, int mesh_config_len, int freq)
2311 {
2312 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2313 struct ieee80211_sta_bss *bss;
2314
2315 if (mesh_config_len != MESH_CFG_LEN)
2316 return NULL;
2317
2318 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2319 if (!bss)
2320 return NULL;
2321
2322 bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
2323 if (!bss->mesh_cfg) {
2324 kfree(bss);
2325 return NULL;
2326 }
2327
2328 if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
2329 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
2330 if (!bss->mesh_id) {
2331 kfree(bss->mesh_cfg);
2332 kfree(bss);
2333 return NULL;
2334 }
2335 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
2336 }
2337
2338 atomic_inc(&bss->users);
2339 atomic_inc(&bss->users);
2340 memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
2341 bss->mesh_id_len = mesh_id_len;
2342 bss->freq = freq;
2343 spin_lock_bh(&local->sta_bss_lock);
2344 /* TODO: order by RSSI? */
2345 list_add_tail(&bss->list, &local->sta_bss_list);
2346 __ieee80211_rx_bss_hash_add(dev, bss);
2347 spin_unlock_bh(&local->sta_bss_lock);
2348 return bss;
2349 }
2350 #endif
2351
2352 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
2353 {
2354 kfree(bss->wpa_ie);
2355 kfree(bss->rsn_ie);
2356 kfree(bss->wmm_ie);
2357 kfree(bss->ht_ie);
2358 kfree(bss->ht_add_ie);
2359 kfree(bss_mesh_id(bss));
2360 kfree(bss_mesh_cfg(bss));
2361 kfree(bss);
2362 }
2363
2364
2365 static void ieee80211_rx_bss_put(struct ieee80211_local *local,
2366 struct ieee80211_sta_bss *bss)
2367 {
2368 local_bh_disable();
2369 if (!atomic_dec_and_lock(&bss->users, &local->sta_bss_lock)) {
2370 local_bh_enable();
2371 return;
2372 }
2373
2374 __ieee80211_rx_bss_hash_del(local, bss);
2375 list_del(&bss->list);
2376 spin_unlock_bh(&local->sta_bss_lock);
2377 ieee80211_rx_bss_free(bss);
2378 }
2379
2380
2381 void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
2382 {
2383 spin_lock_init(&local->sta_bss_lock);
2384 INIT_LIST_HEAD(&local->sta_bss_list);
2385 }
2386
2387
2388 void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
2389 {
2390 struct ieee80211_sta_bss *bss, *tmp;
2391
2392 list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
2393 ieee80211_rx_bss_put(local, bss);
2394 }
2395
2396
2397 static int ieee80211_sta_join_ibss(struct net_device *dev,
2398 struct ieee80211_if_sta *ifsta,
2399 struct ieee80211_sta_bss *bss)
2400 {
2401 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2402 int res, rates, i, j;
2403 struct sk_buff *skb;
2404 struct ieee80211_mgmt *mgmt;
2405 u8 *pos;
2406 struct ieee80211_sub_if_data *sdata;
2407 struct ieee80211_supported_band *sband;
2408 union iwreq_data wrqu;
2409
2410 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2411
2412 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2413
2414 /* Remove possible STA entries from other IBSS networks. */
2415 sta_info_flush_delayed(sdata);
2416
2417 if (local->ops->reset_tsf) {
2418 /* Reset own TSF to allow time synchronization work. */
2419 local->ops->reset_tsf(local_to_hw(local));
2420 }
2421 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2422 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2423 if (res)
2424 return res;
2425
2426 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2427
2428 sdata->drop_unencrypted = bss->capability &
2429 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2430
2431 res = ieee80211_set_freq(dev, bss->freq);
2432
2433 if (res)
2434 return res;
2435
2436 /* Build IBSS probe response */
2437 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2438 if (skb) {
2439 skb_reserve(skb, local->hw.extra_tx_headroom);
2440
2441 mgmt = (struct ieee80211_mgmt *)
2442 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2443 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2444 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2445 IEEE80211_STYPE_PROBE_RESP);
2446 memset(mgmt->da, 0xff, ETH_ALEN);
2447 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
2448 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2449 mgmt->u.beacon.beacon_int =
2450 cpu_to_le16(local->hw.conf.beacon_int);
2451 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
2452 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2453
2454 pos = skb_put(skb, 2 + ifsta->ssid_len);
2455 *pos++ = WLAN_EID_SSID;
2456 *pos++ = ifsta->ssid_len;
2457 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2458
2459 rates = bss->supp_rates_len;
2460 if (rates > 8)
2461 rates = 8;
2462 pos = skb_put(skb, 2 + rates);
2463 *pos++ = WLAN_EID_SUPP_RATES;
2464 *pos++ = rates;
2465 memcpy(pos, bss->supp_rates, rates);
2466
2467 if (bss->band == IEEE80211_BAND_2GHZ) {
2468 pos = skb_put(skb, 2 + 1);
2469 *pos++ = WLAN_EID_DS_PARAMS;
2470 *pos++ = 1;
2471 *pos++ = ieee80211_frequency_to_channel(bss->freq);
2472 }
2473
2474 pos = skb_put(skb, 2 + 2);
2475 *pos++ = WLAN_EID_IBSS_PARAMS;
2476 *pos++ = 2;
2477 /* FIX: set ATIM window based on scan results */
2478 *pos++ = 0;
2479 *pos++ = 0;
2480
2481 if (bss->supp_rates_len > 8) {
2482 rates = bss->supp_rates_len - 8;
2483 pos = skb_put(skb, 2 + rates);
2484 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2485 *pos++ = rates;
2486 memcpy(pos, &bss->supp_rates[8], rates);
2487 }
2488
2489 ifsta->probe_resp = skb;
2490
2491 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
2492 }
2493
2494 rates = 0;
2495 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2496 for (i = 0; i < bss->supp_rates_len; i++) {
2497 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2498 for (j = 0; j < sband->n_bitrates; j++)
2499 if (sband->bitrates[j].bitrate == bitrate)
2500 rates |= BIT(j);
2501 }
2502 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
2503
2504 ieee80211_sta_def_wmm_params(dev, bss, 1);
2505
2506 ifsta->state = IEEE80211_IBSS_JOINED;
2507 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2508
2509 memset(&wrqu, 0, sizeof(wrqu));
2510 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2511 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
2512
2513 return res;
2514 }
2515
2516 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
2517 struct ieee802_11_elems *elems,
2518 enum ieee80211_band band)
2519 {
2520 struct ieee80211_supported_band *sband;
2521 struct ieee80211_rate *bitrates;
2522 size_t num_rates;
2523 u64 supp_rates;
2524 int i, j;
2525 sband = local->hw.wiphy->bands[band];
2526
2527 if (!sband) {
2528 WARN_ON(1);
2529 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2530 }
2531
2532 bitrates = sband->bitrates;
2533 num_rates = sband->n_bitrates;
2534 supp_rates = 0;
2535 for (i = 0; i < elems->supp_rates_len +
2536 elems->ext_supp_rates_len; i++) {
2537 u8 rate = 0;
2538 int own_rate;
2539 if (i < elems->supp_rates_len)
2540 rate = elems->supp_rates[i];
2541 else if (elems->ext_supp_rates)
2542 rate = elems->ext_supp_rates
2543 [i - elems->supp_rates_len];
2544 own_rate = 5 * (rate & 0x7f);
2545 for (j = 0; j < num_rates; j++)
2546 if (bitrates[j].bitrate == own_rate)
2547 supp_rates |= BIT(j);
2548 }
2549 return supp_rates;
2550 }
2551
2552
2553 static void ieee80211_rx_bss_info(struct net_device *dev,
2554 struct ieee80211_mgmt *mgmt,
2555 size_t len,
2556 struct ieee80211_rx_status *rx_status,
2557 struct ieee802_11_elems *elems,
2558 int beacon)
2559 {
2560 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2561 int freq, clen;
2562 struct ieee80211_sta_bss *bss;
2563 struct sta_info *sta;
2564 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2565 u64 beacon_timestamp, rx_timestamp;
2566 struct ieee80211_channel *channel;
2567 DECLARE_MAC_BUF(mac);
2568 DECLARE_MAC_BUF(mac2);
2569
2570 if (!beacon && memcmp(mgmt->da, dev->dev_addr, ETH_ALEN))
2571 return; /* ignore ProbeResp to foreign address */
2572
2573 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
2574
2575 if (ieee80211_vif_is_mesh(&sdata->vif) && elems->mesh_id &&
2576 elems->mesh_config && mesh_matches_local(elems, dev)) {
2577 u64 rates = ieee80211_sta_get_rates(local, elems,
2578 rx_status->band);
2579
2580 mesh_neighbour_update(mgmt->sa, rates, dev,
2581 mesh_peer_accepts_plinks(elems, dev));
2582 }
2583
2584 rcu_read_lock();
2585
2586 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && elems->supp_rates &&
2587 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0 &&
2588 (sta = sta_info_get(local, mgmt->sa))) {
2589 u64 prev_rates;
2590 u64 supp_rates = ieee80211_sta_get_rates(local, elems,
2591 rx_status->band);
2592
2593 prev_rates = sta->supp_rates[rx_status->band];
2594 sta->supp_rates[rx_status->band] &= supp_rates;
2595 if (sta->supp_rates[rx_status->band] == 0) {
2596 /* No matching rates - this should not really happen.
2597 * Make sure that at least one rate is marked
2598 * supported to avoid issues with TX rate ctrl. */
2599 sta->supp_rates[rx_status->band] =
2600 sdata->u.sta.supp_rates_bits[rx_status->band];
2601 }
2602 }
2603
2604 rcu_read_unlock();
2605
2606 if (elems->ds_params && elems->ds_params_len == 1)
2607 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
2608 else
2609 freq = rx_status->freq;
2610
2611 channel = ieee80211_get_channel(local->hw.wiphy, freq);
2612
2613 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2614 return;
2615
2616 #ifdef CONFIG_MAC80211_MESH
2617 if (elems->mesh_config)
2618 bss = ieee80211_rx_mesh_bss_get(dev, elems->mesh_id,
2619 elems->mesh_id_len, elems->mesh_config, freq);
2620 else
2621 #endif
2622 bss = ieee80211_rx_bss_get(dev, mgmt->bssid, freq,
2623 elems->ssid, elems->ssid_len);
2624 if (!bss) {
2625 #ifdef CONFIG_MAC80211_MESH
2626 if (elems->mesh_config)
2627 bss = ieee80211_rx_mesh_bss_add(dev, elems->mesh_id,
2628 elems->mesh_id_len, elems->mesh_config,
2629 elems->mesh_config_len, freq);
2630 else
2631 #endif
2632 bss = ieee80211_rx_bss_add(dev, mgmt->bssid, freq,
2633 elems->ssid, elems->ssid_len);
2634 if (!bss)
2635 return;
2636 } else {
2637 #if 0
2638 /* TODO: order by RSSI? */
2639 spin_lock_bh(&local->sta_bss_lock);
2640 list_move_tail(&bss->list, &local->sta_bss_list);
2641 spin_unlock_bh(&local->sta_bss_lock);
2642 #endif
2643 }
2644
2645 /* save the ERP value so that it is available at association time */
2646 if (elems->erp_info && elems->erp_info_len >= 1) {
2647 bss->erp_value = elems->erp_info[0];
2648 bss->has_erp_value = 1;
2649 }
2650
2651 if (elems->ht_cap_elem &&
2652 (!bss->ht_ie || bss->ht_ie_len != elems->ht_cap_elem_len ||
2653 memcmp(bss->ht_ie, elems->ht_cap_elem, elems->ht_cap_elem_len))) {
2654 kfree(bss->ht_ie);
2655 bss->ht_ie = kmalloc(elems->ht_cap_elem_len + 2, GFP_ATOMIC);
2656 if (bss->ht_ie) {
2657 memcpy(bss->ht_ie, elems->ht_cap_elem - 2,
2658 elems->ht_cap_elem_len + 2);
2659 bss->ht_ie_len = elems->ht_cap_elem_len + 2;
2660 } else
2661 bss->ht_ie_len = 0;
2662 } else if (!elems->ht_cap_elem && bss->ht_ie) {
2663 kfree(bss->ht_ie);
2664 bss->ht_ie = NULL;
2665 bss->ht_ie_len = 0;
2666 }
2667
2668 if (elems->ht_info_elem &&
2669 (!bss->ht_add_ie ||
2670 bss->ht_add_ie_len != elems->ht_info_elem_len ||
2671 memcmp(bss->ht_add_ie, elems->ht_info_elem,
2672 elems->ht_info_elem_len))) {
2673 kfree(bss->ht_add_ie);
2674 bss->ht_add_ie =
2675 kmalloc(elems->ht_info_elem_len + 2, GFP_ATOMIC);
2676 if (bss->ht_add_ie) {
2677 memcpy(bss->ht_add_ie, elems->ht_info_elem - 2,
2678 elems->ht_info_elem_len + 2);
2679 bss->ht_add_ie_len = elems->ht_info_elem_len + 2;
2680 } else
2681 bss->ht_add_ie_len = 0;
2682 } else if (!elems->ht_info_elem && bss->ht_add_ie) {
2683 kfree(bss->ht_add_ie);
2684 bss->ht_add_ie = NULL;
2685 bss->ht_add_ie_len = 0;
2686 }
2687
2688 bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
2689 bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
2690
2691 bss->supp_rates_len = 0;
2692 if (elems->supp_rates) {
2693 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2694 if (clen > elems->supp_rates_len)
2695 clen = elems->supp_rates_len;
2696 memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates,
2697 clen);
2698 bss->supp_rates_len += clen;
2699 }
2700 if (elems->ext_supp_rates) {
2701 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2702 if (clen > elems->ext_supp_rates_len)
2703 clen = elems->ext_supp_rates_len;
2704 memcpy(&bss->supp_rates[bss->supp_rates_len],
2705 elems->ext_supp_rates, clen);
2706 bss->supp_rates_len += clen;
2707 }
2708
2709 bss->band = rx_status->band;
2710
2711 bss->timestamp = beacon_timestamp;
2712 bss->last_update = jiffies;
2713 bss->signal = rx_status->signal;
2714 bss->noise = rx_status->noise;
2715 bss->qual = rx_status->qual;
2716 if (!beacon && !bss->probe_resp)
2717 bss->probe_resp = true;
2718
2719 /*
2720 * In STA mode, the remaining parameters should not be overridden
2721 * by beacons because they're not necessarily accurate there.
2722 */
2723 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
2724 bss->probe_resp && beacon) {
2725 ieee80211_rx_bss_put(local, bss);
2726 return;
2727 }
2728
2729 if (elems->wpa &&
2730 (!bss->wpa_ie || bss->wpa_ie_len != elems->wpa_len ||
2731 memcmp(bss->wpa_ie, elems->wpa, elems->wpa_len))) {
2732 kfree(bss->wpa_ie);
2733 bss->wpa_ie = kmalloc(elems->wpa_len + 2, GFP_ATOMIC);
2734 if (bss->wpa_ie) {
2735 memcpy(bss->wpa_ie, elems->wpa - 2, elems->wpa_len + 2);
2736 bss->wpa_ie_len = elems->wpa_len + 2;
2737 } else
2738 bss->wpa_ie_len = 0;
2739 } else if (!elems->wpa && bss->wpa_ie) {
2740 kfree(bss->wpa_ie);
2741 bss->wpa_ie = NULL;
2742 bss->wpa_ie_len = 0;
2743 }
2744
2745 if (elems->rsn &&
2746 (!bss->rsn_ie || bss->rsn_ie_len != elems->rsn_len ||
2747 memcmp(bss->rsn_ie, elems->rsn, elems->rsn_len))) {
2748 kfree(bss->rsn_ie);
2749 bss->rsn_ie = kmalloc(elems->rsn_len + 2, GFP_ATOMIC);
2750 if (bss->rsn_ie) {
2751 memcpy(bss->rsn_ie, elems->rsn - 2, elems->rsn_len + 2);
2752 bss->rsn_ie_len = elems->rsn_len + 2;
2753 } else
2754 bss->rsn_ie_len = 0;
2755 } else if (!elems->rsn && bss->rsn_ie) {
2756 kfree(bss->rsn_ie);
2757 bss->rsn_ie = NULL;
2758 bss->rsn_ie_len = 0;
2759 }
2760
2761 /*
2762 * Cf.
2763 * http://www.wipo.int/pctdb/en/wo.jsp?wo=2007047181&IA=WO2007047181&DISPLAY=DESC
2764 *
2765 * quoting:
2766 *
2767 * In particular, "Wi-Fi CERTIFIED for WMM - Support for Multimedia
2768 * Applications with Quality of Service in Wi-Fi Networks," Wi- Fi
2769 * Alliance (September 1, 2004) is incorporated by reference herein.
2770 * The inclusion of the WMM Parameters in probe responses and
2771 * association responses is mandatory for WMM enabled networks. The
2772 * inclusion of the WMM Parameters in beacons, however, is optional.
2773 */
2774
2775 if (elems->wmm_param &&
2776 (!bss->wmm_ie || bss->wmm_ie_len != elems->wmm_param_len ||
2777 memcmp(bss->wmm_ie, elems->wmm_param, elems->wmm_param_len))) {
2778 kfree(bss->wmm_ie);
2779 bss->wmm_ie = kmalloc(elems->wmm_param_len + 2, GFP_ATOMIC);
2780 if (bss->wmm_ie) {
2781 memcpy(bss->wmm_ie, elems->wmm_param - 2,
2782 elems->wmm_param_len + 2);
2783 bss->wmm_ie_len = elems->wmm_param_len + 2;
2784 } else
2785 bss->wmm_ie_len = 0;
2786 } else if (elems->wmm_info &&
2787 (!bss->wmm_ie || bss->wmm_ie_len != elems->wmm_info_len ||
2788 memcmp(bss->wmm_ie, elems->wmm_info,
2789 elems->wmm_info_len))) {
2790 /* As for certain AP's Fifth bit is not set in WMM IE in
2791 * beacon frames.So while parsing the beacon frame the
2792 * wmm_info structure is used instead of wmm_param.
2793 * wmm_info structure was never used to set bss->wmm_ie.
2794 * This code fixes this problem by copying the WME
2795 * information from wmm_info to bss->wmm_ie and enabling
2796 * n-band association.
2797 */
2798 kfree(bss->wmm_ie);
2799 bss->wmm_ie = kmalloc(elems->wmm_info_len + 2, GFP_ATOMIC);
2800 if (bss->wmm_ie) {
2801 memcpy(bss->wmm_ie, elems->wmm_info - 2,
2802 elems->wmm_info_len + 2);
2803 bss->wmm_ie_len = elems->wmm_info_len + 2;
2804 } else
2805 bss->wmm_ie_len = 0;
2806 } else if (!elems->wmm_param && !elems->wmm_info && bss->wmm_ie) {
2807 kfree(bss->wmm_ie);
2808 bss->wmm_ie = NULL;
2809 bss->wmm_ie_len = 0;
2810 }
2811
2812 /* check if we need to merge IBSS */
2813 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
2814 !local->sta_sw_scanning && !local->sta_hw_scanning &&
2815 bss->capability & WLAN_CAPABILITY_IBSS &&
2816 bss->freq == local->oper_channel->center_freq &&
2817 elems->ssid_len == sdata->u.sta.ssid_len &&
2818 memcmp(elems->ssid, sdata->u.sta.ssid,
2819 sdata->u.sta.ssid_len) == 0) {
2820 if (rx_status->flag & RX_FLAG_TSFT) {
2821 /* in order for correct IBSS merging we need mactime
2822 *
2823 * since mactime is defined as the time the first data
2824 * symbol of the frame hits the PHY, and the timestamp
2825 * of the beacon is defined as "the time that the data
2826 * symbol containing the first bit of the timestamp is
2827 * transmitted to the PHY plus the transmitting STA’s
2828 * delays through its local PHY from the MAC-PHY
2829 * interface to its interface with the WM"
2830 * (802.11 11.1.2) - equals the time this bit arrives at
2831 * the receiver - we have to take into account the
2832 * offset between the two.
2833 * e.g: at 1 MBit that means mactime is 192 usec earlier
2834 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
2835 */
2836 int rate = local->hw.wiphy->bands[rx_status->band]->
2837 bitrates[rx_status->rate_idx].bitrate;
2838 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
2839 } else if (local && local->ops && local->ops->get_tsf)
2840 /* second best option: get current TSF */
2841 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
2842 else
2843 /* can't merge without knowing the TSF */
2844 rx_timestamp = -1LLU;
2845 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2846 printk(KERN_DEBUG "RX beacon SA=%s BSSID="
2847 "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
2848 print_mac(mac, mgmt->sa),
2849 print_mac(mac2, mgmt->bssid),
2850 (unsigned long long)rx_timestamp,
2851 (unsigned long long)beacon_timestamp,
2852 (unsigned long long)(rx_timestamp - beacon_timestamp),
2853 jiffies);
2854 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2855 if (beacon_timestamp > rx_timestamp) {
2856 #ifndef CONFIG_MAC80211_IBSS_DEBUG
2857 printk(KERN_DEBUG "%s: beacon TSF higher than "
2858 "local TSF - IBSS merge with BSSID %s\n",
2859 dev->name, print_mac(mac, mgmt->bssid));
2860 #endif
2861 ieee80211_sta_join_ibss(dev, &sdata->u.sta, bss);
2862 ieee80211_ibss_add_sta(dev, NULL,
2863 mgmt->bssid, mgmt->sa,
2864 BIT(rx_status->rate_idx));
2865 }
2866 }
2867
2868 ieee80211_rx_bss_put(local, bss);
2869 }
2870
2871
2872 static void ieee80211_rx_mgmt_probe_resp(struct net_device *dev,
2873 struct ieee80211_mgmt *mgmt,
2874 size_t len,
2875 struct ieee80211_rx_status *rx_status)
2876 {
2877 size_t baselen;
2878 struct ieee802_11_elems elems;
2879
2880 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2881 if (baselen > len)
2882 return;
2883
2884 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2885 &elems);
2886
2887 ieee80211_rx_bss_info(dev, mgmt, len, rx_status, &elems, 0);
2888 }
2889
2890
2891 static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
2892 struct ieee80211_mgmt *mgmt,
2893 size_t len,
2894 struct ieee80211_rx_status *rx_status)
2895 {
2896 struct ieee80211_sub_if_data *sdata;
2897 struct ieee80211_if_sta *ifsta;
2898 size_t baselen;
2899 struct ieee802_11_elems elems;
2900 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2901 struct ieee80211_conf *conf = &local->hw.conf;
2902 u32 changed = 0;
2903
2904 /* Process beacon from the current BSS */
2905 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2906 if (baselen > len)
2907 return;
2908
2909 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
2910
2911 ieee80211_rx_bss_info(dev, mgmt, len, rx_status, &elems, 1);
2912
2913 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2914 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2915 return;
2916 ifsta = &sdata->u.sta;
2917
2918 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
2919 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
2920 return;
2921
2922 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
2923 elems.wmm_param_len);
2924
2925 /* Do not send changes to driver if we are scanning. This removes
2926 * requirement that driver's bss_info_changed function needs to be
2927 * atomic. */
2928 if (local->sta_sw_scanning || local->sta_hw_scanning)
2929 return;
2930
2931 if (elems.erp_info && elems.erp_info_len >= 1)
2932 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
2933 else {
2934 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
2935 changed |= ieee80211_handle_protect_preamb(sdata, false,
2936 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
2937 }
2938
2939 if (elems.ht_cap_elem && elems.ht_info_elem &&
2940 elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
2941 struct ieee80211_ht_bss_info bss_info;
2942
2943 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2944 (struct ieee80211_ht_addt_info *)
2945 elems.ht_info_elem, &bss_info);
2946 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
2947 &bss_info);
2948 }
2949
2950 ieee80211_bss_info_change_notify(sdata, changed);
2951 }
2952
2953
2954 static void ieee80211_rx_mgmt_probe_req(struct net_device *dev,
2955 struct ieee80211_if_sta *ifsta,
2956 struct ieee80211_mgmt *mgmt,
2957 size_t len,
2958 struct ieee80211_rx_status *rx_status)
2959 {
2960 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2961 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2962 int tx_last_beacon;
2963 struct sk_buff *skb;
2964 struct ieee80211_mgmt *resp;
2965 u8 *pos, *end;
2966 DECLARE_MAC_BUF(mac);
2967 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2968 DECLARE_MAC_BUF(mac2);
2969 DECLARE_MAC_BUF(mac3);
2970 #endif
2971
2972 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS ||
2973 ifsta->state != IEEE80211_IBSS_JOINED ||
2974 len < 24 + 2 || !ifsta->probe_resp)
2975 return;
2976
2977 if (local->ops->tx_last_beacon)
2978 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2979 else
2980 tx_last_beacon = 1;
2981
2982 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2983 printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
2984 "%s (tx_last_beacon=%d)\n",
2985 dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
2986 print_mac(mac3, mgmt->bssid), tx_last_beacon);
2987 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2988
2989 if (!tx_last_beacon)
2990 return;
2991
2992 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2993 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2994 return;
2995
2996 end = ((u8 *) mgmt) + len;
2997 pos = mgmt->u.probe_req.variable;
2998 if (pos[0] != WLAN_EID_SSID ||
2999 pos + 2 + pos[1] > end) {
3000 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3001 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
3002 "from %s\n",
3003 dev->name, print_mac(mac, mgmt->sa));
3004 #endif
3005 return;
3006 }
3007 if (pos[1] != 0 &&
3008 (pos[1] != ifsta->ssid_len ||
3009 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
3010 /* Ignore ProbeReq for foreign SSID */
3011 return;
3012 }
3013
3014 /* Reply with ProbeResp */
3015 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
3016 if (!skb)
3017 return;
3018
3019 resp = (struct ieee80211_mgmt *) skb->data;
3020 memcpy(resp->da, mgmt->sa, ETH_ALEN);
3021 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3022 printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
3023 dev->name, print_mac(mac, resp->da));
3024 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3025 ieee80211_sta_tx(dev, skb, 0);
3026 }
3027
3028 static void ieee80211_rx_mgmt_action(struct net_device *dev,
3029 struct ieee80211_if_sta *ifsta,
3030 struct ieee80211_mgmt *mgmt,
3031 size_t len,
3032 struct ieee80211_rx_status *rx_status)
3033 {
3034 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3035 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3036
3037 if (len < IEEE80211_MIN_ACTION_SIZE)
3038 return;
3039
3040 switch (mgmt->u.action.category) {
3041 case WLAN_CATEGORY_SPECTRUM_MGMT:
3042 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
3043 break;
3044 switch (mgmt->u.action.u.chan_switch.action_code) {
3045 case WLAN_ACTION_SPCT_MSR_REQ:
3046 if (len < (IEEE80211_MIN_ACTION_SIZE +
3047 sizeof(mgmt->u.action.u.measurement)))
3048 break;
3049 ieee80211_sta_process_measurement_req(dev, mgmt, len);
3050 break;
3051 }
3052 break;
3053 case WLAN_CATEGORY_BACK:
3054 switch (mgmt->u.action.u.addba_req.action_code) {
3055 case WLAN_ACTION_ADDBA_REQ:
3056 if (len < (IEEE80211_MIN_ACTION_SIZE +
3057 sizeof(mgmt->u.action.u.addba_req)))
3058 break;
3059 ieee80211_sta_process_addba_request(dev, mgmt, len);
3060 break;
3061 case WLAN_ACTION_ADDBA_RESP:
3062 if (len < (IEEE80211_MIN_ACTION_SIZE +
3063 sizeof(mgmt->u.action.u.addba_resp)))
3064 break;
3065 ieee80211_sta_process_addba_resp(dev, mgmt, len);
3066 break;
3067 case WLAN_ACTION_DELBA:
3068 if (len < (IEEE80211_MIN_ACTION_SIZE +
3069 sizeof(mgmt->u.action.u.delba)))
3070 break;
3071 ieee80211_sta_process_delba(dev, mgmt, len);
3072 break;
3073 }
3074 break;
3075 case PLINK_CATEGORY:
3076 if (ieee80211_vif_is_mesh(&sdata->vif))
3077 mesh_rx_plink_frame(dev, mgmt, len, rx_status);
3078 break;
3079 case MESH_PATH_SEL_CATEGORY:
3080 if (ieee80211_vif_is_mesh(&sdata->vif))
3081 mesh_rx_path_sel_frame(dev, mgmt, len);
3082 break;
3083 }
3084 }
3085
3086 void ieee80211_sta_rx_mgmt(struct net_device *dev, struct sk_buff *skb,
3087 struct ieee80211_rx_status *rx_status)
3088 {
3089 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3090 struct ieee80211_sub_if_data *sdata;
3091 struct ieee80211_if_sta *ifsta;
3092 struct ieee80211_mgmt *mgmt;
3093 u16 fc;
3094
3095 if (skb->len < 24)
3096 goto fail;
3097
3098 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3099 ifsta = &sdata->u.sta;
3100
3101 mgmt = (struct ieee80211_mgmt *) skb->data;
3102 fc = le16_to_cpu(mgmt->frame_control);
3103
3104 switch (fc & IEEE80211_FCTL_STYPE) {
3105 case IEEE80211_STYPE_PROBE_REQ:
3106 case IEEE80211_STYPE_PROBE_RESP:
3107 case IEEE80211_STYPE_BEACON:
3108 case IEEE80211_STYPE_ACTION:
3109 memcpy(skb->cb, rx_status, sizeof(*rx_status));
3110 case IEEE80211_STYPE_AUTH:
3111 case IEEE80211_STYPE_ASSOC_RESP:
3112 case IEEE80211_STYPE_REASSOC_RESP:
3113 case IEEE80211_STYPE_DEAUTH:
3114 case IEEE80211_STYPE_DISASSOC:
3115 skb_queue_tail(&ifsta->skb_queue, skb);
3116 queue_work(local->hw.workqueue, &ifsta->work);
3117 return;
3118 }
3119
3120 fail:
3121 kfree_skb(skb);
3122 }
3123
3124
3125 static void ieee80211_sta_rx_queued_mgmt(struct net_device *dev,
3126 struct sk_buff *skb)
3127 {
3128 struct ieee80211_rx_status *rx_status;
3129 struct ieee80211_sub_if_data *sdata;
3130 struct ieee80211_if_sta *ifsta;
3131 struct ieee80211_mgmt *mgmt;
3132 u16 fc;
3133
3134 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3135 ifsta = &sdata->u.sta;
3136
3137 rx_status = (struct ieee80211_rx_status *) skb->cb;
3138 mgmt = (struct ieee80211_mgmt *) skb->data;
3139 fc = le16_to_cpu(mgmt->frame_control);
3140
3141 switch (fc & IEEE80211_FCTL_STYPE) {
3142 case IEEE80211_STYPE_PROBE_REQ:
3143 ieee80211_rx_mgmt_probe_req(dev, ifsta, mgmt, skb->len,
3144 rx_status);
3145 break;
3146 case IEEE80211_STYPE_PROBE_RESP:
3147 ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
3148 break;
3149 case IEEE80211_STYPE_BEACON:
3150 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
3151 break;
3152 case IEEE80211_STYPE_AUTH:
3153 ieee80211_rx_mgmt_auth(dev, ifsta, mgmt, skb->len);
3154 break;
3155 case IEEE80211_STYPE_ASSOC_RESP:
3156 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
3157 break;
3158 case IEEE80211_STYPE_REASSOC_RESP:
3159 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
3160 break;
3161 case IEEE80211_STYPE_DEAUTH:
3162 ieee80211_rx_mgmt_deauth(dev, ifsta, mgmt, skb->len);
3163 break;
3164 case IEEE80211_STYPE_DISASSOC:
3165 ieee80211_rx_mgmt_disassoc(dev, ifsta, mgmt, skb->len);
3166 break;
3167 case IEEE80211_STYPE_ACTION:
3168 ieee80211_rx_mgmt_action(dev, ifsta, mgmt, skb->len, rx_status);
3169 break;
3170 }
3171
3172 kfree_skb(skb);
3173 }
3174
3175
3176 ieee80211_rx_result
3177 ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
3178 struct ieee80211_rx_status *rx_status)
3179 {
3180 struct ieee80211_mgmt *mgmt;
3181 __le16 fc;
3182
3183 if (skb->len < 2)
3184 return RX_DROP_UNUSABLE;
3185
3186 mgmt = (struct ieee80211_mgmt *) skb->data;
3187 fc = mgmt->frame_control;
3188
3189 if (ieee80211_is_ctl(fc))
3190 return RX_CONTINUE;
3191
3192 if (skb->len < 24)
3193 return RX_DROP_MONITOR;
3194
3195 if (ieee80211_is_probe_resp(fc)) {
3196 ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
3197 dev_kfree_skb(skb);
3198 return RX_QUEUED;
3199 }
3200
3201 if (ieee80211_is_beacon(fc)) {
3202 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
3203 dev_kfree_skb(skb);
3204 return RX_QUEUED;
3205 }
3206
3207 return RX_CONTINUE;
3208 }
3209
3210
3211 static int ieee80211_sta_active_ibss(struct net_device *dev)
3212 {
3213 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3214 int active = 0;
3215 struct sta_info *sta;
3216 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3217
3218 rcu_read_lock();
3219
3220 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3221 if (sta->sdata == sdata &&
3222 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
3223 jiffies)) {
3224 active++;
3225 break;
3226 }
3227 }
3228
3229 rcu_read_unlock();
3230
3231 return active;
3232 }
3233
3234
3235 static void ieee80211_sta_expire(struct net_device *dev, unsigned long exp_time)
3236 {
3237 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3238 struct sta_info *sta, *tmp;
3239 LIST_HEAD(tmp_list);
3240 DECLARE_MAC_BUF(mac);
3241 unsigned long flags;
3242
3243 spin_lock_irqsave(&local->sta_lock, flags);
3244 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
3245 if (time_after(jiffies, sta->last_rx + exp_time)) {
3246 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3247 printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
3248 dev->name, print_mac(mac, sta->addr));
3249 #endif
3250 __sta_info_unlink(&sta);
3251 if (sta)
3252 list_add(&sta->list, &tmp_list);
3253 }
3254 spin_unlock_irqrestore(&local->sta_lock, flags);
3255
3256 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
3257 sta_info_destroy(sta);
3258 }
3259
3260
3261 static void ieee80211_sta_merge_ibss(struct net_device *dev,
3262 struct ieee80211_if_sta *ifsta)
3263 {
3264 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
3265
3266 ieee80211_sta_expire(dev, IEEE80211_IBSS_INACTIVITY_LIMIT);
3267 if (ieee80211_sta_active_ibss(dev))
3268 return;
3269
3270 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
3271 "IBSS networks with same SSID (merge)\n", dev->name);
3272 ieee80211_sta_req_scan(dev, ifsta->ssid, ifsta->ssid_len);
3273 }
3274
3275
3276 #ifdef CONFIG_MAC80211_MESH
3277 static void ieee80211_mesh_housekeeping(struct net_device *dev,
3278 struct ieee80211_if_sta *ifsta)
3279 {
3280 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3281 bool free_plinks;
3282
3283 ieee80211_sta_expire(dev, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
3284 mesh_path_expire(dev);
3285
3286 free_plinks = mesh_plink_availables(sdata);
3287 if (free_plinks != sdata->u.sta.accepting_plinks)
3288 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3289
3290 mod_timer(&ifsta->timer, jiffies +
3291 IEEE80211_MESH_HOUSEKEEPING_INTERVAL);
3292 }
3293
3294
3295 void ieee80211_start_mesh(struct net_device *dev)
3296 {
3297 struct ieee80211_if_sta *ifsta;
3298 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3299 ifsta = &sdata->u.sta;
3300 ifsta->state = IEEE80211_MESH_UP;
3301 ieee80211_sta_timer((unsigned long)sdata);
3302 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3303 }
3304 #endif
3305
3306
3307 void ieee80211_sta_timer(unsigned long data)
3308 {
3309 struct ieee80211_sub_if_data *sdata =
3310 (struct ieee80211_sub_if_data *) data;
3311 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3312 struct ieee80211_local *local = wdev_priv(&sdata->wdev);
3313
3314 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3315 queue_work(local->hw.workqueue, &ifsta->work);
3316 }
3317
3318 void ieee80211_sta_work(struct work_struct *work)
3319 {
3320 struct ieee80211_sub_if_data *sdata =
3321 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
3322 struct net_device *dev = sdata->dev;
3323 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3324 struct ieee80211_if_sta *ifsta;
3325 struct sk_buff *skb;
3326
3327 if (!netif_running(dev))
3328 return;
3329
3330 if (local->sta_sw_scanning || local->sta_hw_scanning)
3331 return;
3332
3333 if (WARN_ON(sdata->vif.type != IEEE80211_IF_TYPE_STA &&
3334 sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
3335 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
3336 return;
3337 ifsta = &sdata->u.sta;
3338
3339 while ((skb = skb_dequeue(&ifsta->skb_queue)))
3340 ieee80211_sta_rx_queued_mgmt(dev, skb);
3341
3342 #ifdef CONFIG_MAC80211_MESH
3343 if (ifsta->preq_queue_len &&
3344 time_after(jiffies,
3345 ifsta->last_preq + msecs_to_jiffies(ifsta->mshcfg.dot11MeshHWMPpreqMinInterval)))
3346 mesh_path_start_discovery(dev);
3347 #endif
3348
3349 if (ifsta->state != IEEE80211_AUTHENTICATE &&
3350 ifsta->state != IEEE80211_ASSOCIATE &&
3351 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
3352 if (ifsta->scan_ssid_len)
3353 ieee80211_sta_start_scan(dev, ifsta->scan_ssid, ifsta->scan_ssid_len);
3354 else
3355 ieee80211_sta_start_scan(dev, NULL, 0);
3356 return;
3357 }
3358
3359 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
3360 if (ieee80211_sta_config_auth(dev, ifsta))
3361 return;
3362 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3363 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
3364 return;
3365
3366 switch (ifsta->state) {
3367 case IEEE80211_DISABLED:
3368 break;
3369 case IEEE80211_AUTHENTICATE:
3370 ieee80211_authenticate(dev, ifsta);
3371 break;
3372 case IEEE80211_ASSOCIATE:
3373 ieee80211_associate(dev, ifsta);
3374 break;
3375 case IEEE80211_ASSOCIATED:
3376 ieee80211_associated(dev, ifsta);
3377 break;
3378 case IEEE80211_IBSS_SEARCH:
3379 ieee80211_sta_find_ibss(dev, ifsta);
3380 break;
3381 case IEEE80211_IBSS_JOINED:
3382 ieee80211_sta_merge_ibss(dev, ifsta);
3383 break;
3384 #ifdef CONFIG_MAC80211_MESH
3385 case IEEE80211_MESH_UP:
3386 ieee80211_mesh_housekeeping(dev, ifsta);
3387 break;
3388 #endif
3389 default:
3390 WARN_ON(1);
3391 break;
3392 }
3393
3394 if (ieee80211_privacy_mismatch(dev, ifsta)) {
3395 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
3396 "mixed-cell disabled - disassociate\n", dev->name);
3397
3398 ieee80211_send_disassoc(dev, ifsta, WLAN_REASON_UNSPECIFIED);
3399 ieee80211_set_disassoc(dev, ifsta, 0);
3400 }
3401 }
3402
3403
3404 static void ieee80211_sta_reset_auth(struct net_device *dev,
3405 struct ieee80211_if_sta *ifsta)
3406 {
3407 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3408
3409 if (local->ops->reset_tsf) {
3410 /* Reset own TSF to allow time synchronization work. */
3411 local->ops->reset_tsf(local_to_hw(local));
3412 }
3413
3414 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
3415
3416
3417 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
3418 ifsta->auth_alg = WLAN_AUTH_OPEN;
3419 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
3420 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
3421 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
3422 ifsta->auth_alg = WLAN_AUTH_LEAP;
3423 else
3424 ifsta->auth_alg = WLAN_AUTH_OPEN;
3425 ifsta->auth_transaction = -1;
3426 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
3427 ifsta->auth_tries = ifsta->assoc_tries = 0;
3428 netif_carrier_off(dev);
3429 }
3430
3431
3432 void ieee80211_sta_req_auth(struct net_device *dev,
3433 struct ieee80211_if_sta *ifsta)
3434 {
3435 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3436 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3437
3438 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3439 return;
3440
3441 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
3442 IEEE80211_STA_AUTO_BSSID_SEL)) &&
3443 (ifsta->flags & (IEEE80211_STA_SSID_SET |
3444 IEEE80211_STA_AUTO_SSID_SEL))) {
3445 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3446 queue_work(local->hw.workqueue, &ifsta->work);
3447 }
3448 }
3449
3450 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
3451 const char *ssid, int ssid_len)
3452 {
3453 int tmp, hidden_ssid;
3454
3455 if (ssid_len == ifsta->ssid_len &&
3456 !memcmp(ifsta->ssid, ssid, ssid_len))
3457 return 1;
3458
3459 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
3460 return 0;
3461
3462 hidden_ssid = 1;
3463 tmp = ssid_len;
3464 while (tmp--) {
3465 if (ssid[tmp] != '\0') {
3466 hidden_ssid = 0;
3467 break;
3468 }
3469 }
3470
3471 if (hidden_ssid && ifsta->ssid_len == ssid_len)
3472 return 1;
3473
3474 if (ssid_len == 1 && ssid[0] == ' ')
3475 return 1;
3476
3477 return 0;
3478 }
3479
3480 static int ieee80211_sta_config_auth(struct net_device *dev,
3481 struct ieee80211_if_sta *ifsta)
3482 {
3483 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3484 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3485 struct ieee80211_sta_bss *bss, *selected = NULL;
3486 int top_rssi = 0, freq;
3487
3488 spin_lock_bh(&local->sta_bss_lock);
3489 freq = local->oper_channel->center_freq;
3490 list_for_each_entry(bss, &local->sta_bss_list, list) {
3491 if (!(bss->capability & WLAN_CAPABILITY_ESS))
3492 continue;
3493
3494 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
3495 IEEE80211_STA_AUTO_BSSID_SEL |
3496 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
3497 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
3498 !!sdata->default_key))
3499 continue;
3500
3501 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
3502 bss->freq != freq)
3503 continue;
3504
3505 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
3506 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
3507 continue;
3508
3509 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
3510 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
3511 continue;
3512
3513 if (!selected || top_rssi < bss->signal) {
3514 selected = bss;
3515 top_rssi = bss->signal;
3516 }
3517 }
3518 if (selected)
3519 atomic_inc(&selected->users);
3520 spin_unlock_bh(&local->sta_bss_lock);
3521
3522 if (selected) {
3523 ieee80211_set_freq(dev, selected->freq);
3524 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
3525 ieee80211_sta_set_ssid(dev, selected->ssid,
3526 selected->ssid_len);
3527 ieee80211_sta_set_bssid(dev, selected->bssid);
3528 ieee80211_sta_def_wmm_params(dev, selected, 0);
3529 ieee80211_rx_bss_put(local, selected);
3530 ifsta->state = IEEE80211_AUTHENTICATE;
3531 ieee80211_sta_reset_auth(dev, ifsta);
3532 return 0;
3533 } else {
3534 if (ifsta->state != IEEE80211_AUTHENTICATE) {
3535 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
3536 ieee80211_sta_start_scan(dev, NULL, 0);
3537 else
3538 ieee80211_sta_start_scan(dev, ifsta->ssid,
3539 ifsta->ssid_len);
3540 ifsta->state = IEEE80211_AUTHENTICATE;
3541 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3542 } else
3543 ifsta->state = IEEE80211_DISABLED;
3544 }
3545 return -1;
3546 }
3547
3548
3549 static int ieee80211_sta_create_ibss(struct net_device *dev,
3550 struct ieee80211_if_sta *ifsta)
3551 {
3552 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3553 struct ieee80211_sta_bss *bss;
3554 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3555 struct ieee80211_supported_band *sband;
3556 u8 bssid[ETH_ALEN], *pos;
3557 int i;
3558 int ret;
3559 DECLARE_MAC_BUF(mac);
3560
3561 #if 0
3562 /* Easier testing, use fixed BSSID. */
3563 memset(bssid, 0xfe, ETH_ALEN);
3564 #else
3565 /* Generate random, not broadcast, locally administered BSSID. Mix in
3566 * own MAC address to make sure that devices that do not have proper
3567 * random number generator get different BSSID. */
3568 get_random_bytes(bssid, ETH_ALEN);
3569 for (i = 0; i < ETH_ALEN; i++)
3570 bssid[i] ^= dev->dev_addr[i];
3571 bssid[0] &= ~0x01;
3572 bssid[0] |= 0x02;
3573 #endif
3574
3575 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
3576 dev->name, print_mac(mac, bssid));
3577
3578 bss = ieee80211_rx_bss_add(dev, bssid,
3579 local->hw.conf.channel->center_freq,
3580 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
3581 if (!bss)
3582 return -ENOMEM;
3583
3584 bss->band = local->hw.conf.channel->band;
3585 sband = local->hw.wiphy->bands[bss->band];
3586
3587 if (local->hw.conf.beacon_int == 0)
3588 local->hw.conf.beacon_int = 100;
3589 bss->beacon_int = local->hw.conf.beacon_int;
3590 bss->last_update = jiffies;
3591 bss->capability = WLAN_CAPABILITY_IBSS;
3592
3593 if (sdata->default_key)
3594 bss->capability |= WLAN_CAPABILITY_PRIVACY;
3595 else
3596 sdata->drop_unencrypted = 0;
3597
3598 bss->supp_rates_len = sband->n_bitrates;
3599 pos = bss->supp_rates;
3600 for (i = 0; i < sband->n_bitrates; i++) {
3601 int rate = sband->bitrates[i].bitrate;
3602 *pos++ = (u8) (rate / 5);
3603 }
3604
3605 ret = ieee80211_sta_join_ibss(dev, ifsta, bss);
3606 ieee80211_rx_bss_put(local, bss);
3607 return ret;
3608 }
3609
3610
3611 static int ieee80211_sta_find_ibss(struct net_device *dev,
3612 struct ieee80211_if_sta *ifsta)
3613 {
3614 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3615 struct ieee80211_sta_bss *bss;
3616 int found = 0;
3617 u8 bssid[ETH_ALEN];
3618 int active_ibss;
3619 DECLARE_MAC_BUF(mac);
3620 DECLARE_MAC_BUF(mac2);
3621
3622 if (ifsta->ssid_len == 0)
3623 return -EINVAL;
3624
3625 active_ibss = ieee80211_sta_active_ibss(dev);
3626 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3627 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
3628 dev->name, active_ibss);
3629 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3630 spin_lock_bh(&local->sta_bss_lock);
3631 list_for_each_entry(bss, &local->sta_bss_list, list) {
3632 if (ifsta->ssid_len != bss->ssid_len ||
3633 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
3634 || !(bss->capability & WLAN_CAPABILITY_IBSS))
3635 continue;
3636 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3637 printk(KERN_DEBUG " bssid=%s found\n",
3638 print_mac(mac, bss->bssid));
3639 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3640 memcpy(bssid, bss->bssid, ETH_ALEN);
3641 found = 1;
3642 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
3643 break;
3644 }
3645 spin_unlock_bh(&local->sta_bss_lock);
3646
3647 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3648 if (found)
3649 printk(KERN_DEBUG " sta_find_ibss: selected %s current "
3650 "%s\n", print_mac(mac, bssid),
3651 print_mac(mac2, ifsta->bssid));
3652 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3653 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
3654 (bss = ieee80211_rx_bss_get(dev, bssid,
3655 local->hw.conf.channel->center_freq,
3656 ifsta->ssid, ifsta->ssid_len))) {
3657 int ret;
3658 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
3659 " based on configured SSID\n",
3660 dev->name, print_mac(mac, bssid));
3661 ret = ieee80211_sta_join_ibss(dev, ifsta, bss);
3662 ieee80211_rx_bss_put(local, bss);
3663 return ret;
3664 }
3665 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3666 printk(KERN_DEBUG " did not try to join ibss\n");
3667 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3668
3669 /* Selected IBSS not found in current scan results - try to scan */
3670 if (ifsta->state == IEEE80211_IBSS_JOINED &&
3671 !ieee80211_sta_active_ibss(dev)) {
3672 mod_timer(&ifsta->timer, jiffies +
3673 IEEE80211_IBSS_MERGE_INTERVAL);
3674 } else if (time_after(jiffies, local->last_scan_completed +
3675 IEEE80211_SCAN_INTERVAL)) {
3676 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
3677 "join\n", dev->name);
3678 return ieee80211_sta_req_scan(dev, ifsta->ssid,
3679 ifsta->ssid_len);
3680 } else if (ifsta->state != IEEE80211_IBSS_JOINED) {
3681 int interval = IEEE80211_SCAN_INTERVAL;
3682
3683 if (time_after(jiffies, ifsta->ibss_join_req +
3684 IEEE80211_IBSS_JOIN_TIMEOUT)) {
3685 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
3686 (!(local->oper_channel->flags &
3687 IEEE80211_CHAN_NO_IBSS)))
3688 return ieee80211_sta_create_ibss(dev, ifsta);
3689 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
3690 printk(KERN_DEBUG "%s: IBSS not allowed on"
3691 " %d MHz\n", dev->name,
3692 local->hw.conf.channel->center_freq);
3693 }
3694
3695 /* No IBSS found - decrease scan interval and continue
3696 * scanning. */
3697 interval = IEEE80211_SCAN_INTERVAL_SLOW;
3698 }
3699
3700 ifsta->state = IEEE80211_IBSS_SEARCH;
3701 mod_timer(&ifsta->timer, jiffies + interval);
3702 return 0;
3703 }
3704
3705 return 0;
3706 }
3707
3708
3709 int ieee80211_sta_set_ssid(struct net_device *dev, char *ssid, size_t len)
3710 {
3711 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3712 struct ieee80211_if_sta *ifsta;
3713 int res;
3714
3715 if (len > IEEE80211_MAX_SSID_LEN)
3716 return -EINVAL;
3717
3718 ifsta = &sdata->u.sta;
3719
3720 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
3721 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
3722 memcpy(ifsta->ssid, ssid, len);
3723 ifsta->ssid_len = len;
3724 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
3725
3726 res = 0;
3727 /*
3728 * Hack! MLME code needs to be cleaned up to have different
3729 * entry points for configuration and internal selection change
3730 */
3731 if (netif_running(sdata->dev))
3732 res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
3733 if (res) {
3734 printk(KERN_DEBUG "%s: Failed to config new SSID to "
3735 "the low-level driver\n", dev->name);
3736 return res;
3737 }
3738 }
3739
3740 if (len)
3741 ifsta->flags |= IEEE80211_STA_SSID_SET;
3742 else
3743 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
3744
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
3752 return 0;
3753 }
3754
3755
3756 int ieee80211_sta_get_ssid(struct net_device *dev, char *ssid, size_t *len)
3757 {
3758 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3759 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3760 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
3761 *len = ifsta->ssid_len;
3762 return 0;
3763 }
3764
3765
3766 int ieee80211_sta_set_bssid(struct net_device *dev, u8 *bssid)
3767 {
3768 struct ieee80211_sub_if_data *sdata;
3769 struct ieee80211_if_sta *ifsta;
3770 int res;
3771
3772 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3773 ifsta = &sdata->u.sta;
3774
3775 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3776 memcpy(ifsta->bssid, bssid, ETH_ALEN);
3777 res = 0;
3778 /*
3779 * Hack! See also ieee80211_sta_set_ssid.
3780 */
3781 if (netif_running(sdata->dev))
3782 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
3783 if (res) {
3784 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
3785 "the low-level driver\n", dev->name);
3786 return res;
3787 }
3788 }
3789
3790 if (is_valid_ether_addr(bssid))
3791 ifsta->flags |= IEEE80211_STA_BSSID_SET;
3792 else
3793 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
3794
3795 return 0;
3796 }
3797
3798
3799 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
3800 struct ieee80211_sub_if_data *sdata,
3801 int powersave)
3802 {
3803 struct sk_buff *skb;
3804 struct ieee80211_hdr *nullfunc;
3805 __le16 fc;
3806
3807 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
3808 if (!skb) {
3809 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
3810 "frame\n", sdata->dev->name);
3811 return;
3812 }
3813 skb_reserve(skb, local->hw.extra_tx_headroom);
3814
3815 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
3816 memset(nullfunc, 0, 24);
3817 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
3818 IEEE80211_FCTL_TODS);
3819 if (powersave)
3820 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
3821 nullfunc->frame_control = fc;
3822 memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
3823 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
3824 memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
3825
3826 ieee80211_sta_tx(sdata->dev, skb, 0);
3827 }
3828
3829
3830 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3831 {
3832 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
3833 ieee80211_vif_is_mesh(&sdata->vif))
3834 ieee80211_sta_timer((unsigned long)sdata);
3835 }
3836
3837 void ieee80211_scan_completed(struct ieee80211_hw *hw)
3838 {
3839 struct ieee80211_local *local = hw_to_local(hw);
3840 struct net_device *dev = local->scan_dev;
3841 struct ieee80211_sub_if_data *sdata;
3842 union iwreq_data wrqu;
3843
3844 local->last_scan_completed = jiffies;
3845 memset(&wrqu, 0, sizeof(wrqu));
3846 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
3847
3848 if (local->sta_hw_scanning) {
3849 local->sta_hw_scanning = 0;
3850 if (ieee80211_hw_config(local))
3851 printk(KERN_DEBUG "%s: failed to restore operational "
3852 "channel after scan\n", dev->name);
3853 /* Restart STA timer for HW scan case */
3854 rcu_read_lock();
3855 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3856 ieee80211_restart_sta_timer(sdata);
3857 rcu_read_unlock();
3858
3859 goto done;
3860 }
3861
3862 local->sta_sw_scanning = 0;
3863 if (ieee80211_hw_config(local))
3864 printk(KERN_DEBUG "%s: failed to restore operational "
3865 "channel after scan\n", dev->name);
3866
3867
3868 netif_tx_lock_bh(local->mdev);
3869 netif_addr_lock(local->mdev);
3870 local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
3871 local->ops->configure_filter(local_to_hw(local),
3872 FIF_BCN_PRBRESP_PROMISC,
3873 &local->filter_flags,
3874 local->mdev->mc_count,
3875 local->mdev->mc_list);
3876
3877 netif_addr_unlock(local->mdev);
3878 netif_tx_unlock_bh(local->mdev);
3879
3880 rcu_read_lock();
3881 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3882 /* Tell AP we're back */
3883 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
3884 sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED)
3885 ieee80211_send_nullfunc(local, sdata, 0);
3886
3887 ieee80211_restart_sta_timer(sdata);
3888
3889 netif_wake_queue(sdata->dev);
3890 }
3891 rcu_read_unlock();
3892
3893 done:
3894 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3895 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
3896 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3897 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
3898 (!ifsta->state == IEEE80211_IBSS_JOINED &&
3899 !ieee80211_sta_active_ibss(dev)))
3900 ieee80211_sta_find_ibss(dev, ifsta);
3901 }
3902 }
3903 EXPORT_SYMBOL(ieee80211_scan_completed);
3904
3905 void ieee80211_sta_scan_work(struct work_struct *work)
3906 {
3907 struct ieee80211_local *local =
3908 container_of(work, struct ieee80211_local, scan_work.work);
3909 struct net_device *dev = local->scan_dev;
3910 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3911 struct ieee80211_supported_band *sband;
3912 struct ieee80211_channel *chan;
3913 int skip;
3914 unsigned long next_delay = 0;
3915
3916 if (!local->sta_sw_scanning)
3917 return;
3918
3919 switch (local->scan_state) {
3920 case SCAN_SET_CHANNEL:
3921 /*
3922 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
3923 * after we successfully scanned the last channel of the last
3924 * band (and the last band is supported by the hw)
3925 */
3926 if (local->scan_band < IEEE80211_NUM_BANDS)
3927 sband = local->hw.wiphy->bands[local->scan_band];
3928 else
3929 sband = NULL;
3930
3931 /*
3932 * If we are at an unsupported band and have more bands
3933 * left to scan, advance to the next supported one.
3934 */
3935 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
3936 local->scan_band++;
3937 sband = local->hw.wiphy->bands[local->scan_band];
3938 local->scan_channel_idx = 0;
3939 }
3940
3941 /* if no more bands/channels left, complete scan */
3942 if (!sband || local->scan_channel_idx >= sband->n_channels) {
3943 ieee80211_scan_completed(local_to_hw(local));
3944 return;
3945 }
3946 skip = 0;
3947 chan = &sband->channels[local->scan_channel_idx];
3948
3949 if (chan->flags & IEEE80211_CHAN_DISABLED ||
3950 (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3951 chan->flags & IEEE80211_CHAN_NO_IBSS))
3952 skip = 1;
3953
3954 if (!skip) {
3955 local->scan_channel = chan;
3956 if (ieee80211_hw_config(local)) {
3957 printk(KERN_DEBUG "%s: failed to set freq to "
3958 "%d MHz for scan\n", dev->name,
3959 chan->center_freq);
3960 skip = 1;
3961 }
3962 }
3963
3964 /* advance state machine to next channel/band */
3965 local->scan_channel_idx++;
3966 if (local->scan_channel_idx >= sband->n_channels) {
3967 /*
3968 * scan_band may end up == IEEE80211_NUM_BANDS, but
3969 * we'll catch that case above and complete the scan
3970 * if that is the case.
3971 */
3972 local->scan_band++;
3973 local->scan_channel_idx = 0;
3974 }
3975
3976 if (skip)
3977 break;
3978
3979 next_delay = IEEE80211_PROBE_DELAY +
3980 usecs_to_jiffies(local->hw.channel_change_time);
3981 local->scan_state = SCAN_SEND_PROBE;
3982 break;
3983 case SCAN_SEND_PROBE:
3984 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
3985 local->scan_state = SCAN_SET_CHANNEL;
3986
3987 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
3988 break;
3989 ieee80211_send_probe_req(dev, NULL, local->scan_ssid,
3990 local->scan_ssid_len);
3991 next_delay = IEEE80211_CHANNEL_TIME;
3992 break;
3993 }
3994
3995 if (local->sta_sw_scanning)
3996 queue_delayed_work(local->hw.workqueue, &local->scan_work,
3997 next_delay);
3998 }
3999
4000
4001 static int ieee80211_sta_start_scan(struct net_device *dev,
4002 u8 *ssid, size_t ssid_len)
4003 {
4004 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4005 struct ieee80211_sub_if_data *sdata;
4006
4007 if (ssid_len > IEEE80211_MAX_SSID_LEN)
4008 return -EINVAL;
4009
4010 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
4011 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
4012 * BSSID: MACAddress
4013 * SSID
4014 * ScanType: ACTIVE, PASSIVE
4015 * ProbeDelay: delay (in microseconds) to be used prior to transmitting
4016 * a Probe frame during active scanning
4017 * ChannelList
4018 * MinChannelTime (>= ProbeDelay), in TU
4019 * MaxChannelTime: (>= MinChannelTime), in TU
4020 */
4021
4022 /* MLME-SCAN.confirm
4023 * BSSDescriptionSet
4024 * ResultCode: SUCCESS, INVALID_PARAMETERS
4025 */
4026
4027 if (local->sta_sw_scanning || local->sta_hw_scanning) {
4028 if (local->scan_dev == dev)
4029 return 0;
4030 return -EBUSY;
4031 }
4032
4033 if (local->ops->hw_scan) {
4034 int rc = local->ops->hw_scan(local_to_hw(local),
4035 ssid, ssid_len);
4036 if (!rc) {
4037 local->sta_hw_scanning = 1;
4038 local->scan_dev = dev;
4039 }
4040 return rc;
4041 }
4042
4043 local->sta_sw_scanning = 1;
4044
4045 rcu_read_lock();
4046 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4047 netif_stop_queue(sdata->dev);
4048 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
4049 (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED))
4050 ieee80211_send_nullfunc(local, sdata, 1);
4051 }
4052 rcu_read_unlock();
4053
4054 if (ssid) {
4055 local->scan_ssid_len = ssid_len;
4056 memcpy(local->scan_ssid, ssid, ssid_len);
4057 } else
4058 local->scan_ssid_len = 0;
4059 local->scan_state = SCAN_SET_CHANNEL;
4060 local->scan_channel_idx = 0;
4061 local->scan_band = IEEE80211_BAND_2GHZ;
4062 local->scan_dev = dev;
4063
4064 netif_addr_lock_bh(local->mdev);
4065 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
4066 local->ops->configure_filter(local_to_hw(local),
4067 FIF_BCN_PRBRESP_PROMISC,
4068 &local->filter_flags,
4069 local->mdev->mc_count,
4070 local->mdev->mc_list);
4071 netif_addr_unlock_bh(local->mdev);
4072
4073 /* TODO: start scan as soon as all nullfunc frames are ACKed */
4074 queue_delayed_work(local->hw.workqueue, &local->scan_work,
4075 IEEE80211_CHANNEL_TIME);
4076
4077 return 0;
4078 }
4079
4080
4081 int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len)
4082 {
4083 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4084 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4085 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4086
4087 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4088 return ieee80211_sta_start_scan(dev, ssid, ssid_len);
4089
4090 if (local->sta_sw_scanning || local->sta_hw_scanning) {
4091 if (local->scan_dev == dev)
4092 return 0;
4093 return -EBUSY;
4094 }
4095
4096 ifsta->scan_ssid_len = ssid_len;
4097 if (ssid_len)
4098 memcpy(ifsta->scan_ssid, ssid, ssid_len);
4099 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
4100 queue_work(local->hw.workqueue, &ifsta->work);
4101 return 0;
4102 }
4103
4104 static char *
4105 ieee80211_sta_scan_result(struct net_device *dev,
4106 struct iw_request_info *info,
4107 struct ieee80211_sta_bss *bss,
4108 char *current_ev, char *end_buf)
4109 {
4110 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4111 struct iw_event iwe;
4112
4113 if (time_after(jiffies,
4114 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
4115 return current_ev;
4116
4117 memset(&iwe, 0, sizeof(iwe));
4118 iwe.cmd = SIOCGIWAP;
4119 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
4120 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
4121 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4122 IW_EV_ADDR_LEN);
4123
4124 memset(&iwe, 0, sizeof(iwe));
4125 iwe.cmd = SIOCGIWESSID;
4126 if (bss_mesh_cfg(bss)) {
4127 iwe.u.data.length = bss_mesh_id_len(bss);
4128 iwe.u.data.flags = 1;
4129 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4130 &iwe, bss_mesh_id(bss));
4131 } else {
4132 iwe.u.data.length = bss->ssid_len;
4133 iwe.u.data.flags = 1;
4134 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4135 &iwe, bss->ssid);
4136 }
4137
4138 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
4139 || bss_mesh_cfg(bss)) {
4140 memset(&iwe, 0, sizeof(iwe));
4141 iwe.cmd = SIOCGIWMODE;
4142 if (bss_mesh_cfg(bss))
4143 iwe.u.mode = IW_MODE_MESH;
4144 else if (bss->capability & WLAN_CAPABILITY_ESS)
4145 iwe.u.mode = IW_MODE_MASTER;
4146 else
4147 iwe.u.mode = IW_MODE_ADHOC;
4148 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
4149 &iwe, IW_EV_UINT_LEN);
4150 }
4151
4152 memset(&iwe, 0, sizeof(iwe));
4153 iwe.cmd = SIOCGIWFREQ;
4154 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
4155 iwe.u.freq.e = 0;
4156 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4157 IW_EV_FREQ_LEN);
4158
4159 memset(&iwe, 0, sizeof(iwe));
4160 iwe.cmd = SIOCGIWFREQ;
4161 iwe.u.freq.m = bss->freq;
4162 iwe.u.freq.e = 6;
4163 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4164 IW_EV_FREQ_LEN);
4165 memset(&iwe, 0, sizeof(iwe));
4166 iwe.cmd = IWEVQUAL;
4167 iwe.u.qual.qual = bss->qual;
4168 iwe.u.qual.level = bss->signal;
4169 iwe.u.qual.noise = bss->noise;
4170 iwe.u.qual.updated = local->wstats_flags;
4171 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4172 IW_EV_QUAL_LEN);
4173
4174 memset(&iwe, 0, sizeof(iwe));
4175 iwe.cmd = SIOCGIWENCODE;
4176 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
4177 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
4178 else
4179 iwe.u.data.flags = IW_ENCODE_DISABLED;
4180 iwe.u.data.length = 0;
4181 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4182 &iwe, "");
4183
4184 if (bss && bss->wpa_ie) {
4185 memset(&iwe, 0, sizeof(iwe));
4186 iwe.cmd = IWEVGENIE;
4187 iwe.u.data.length = bss->wpa_ie_len;
4188 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4189 &iwe, bss->wpa_ie);
4190 }
4191
4192 if (bss && bss->rsn_ie) {
4193 memset(&iwe, 0, sizeof(iwe));
4194 iwe.cmd = IWEVGENIE;
4195 iwe.u.data.length = bss->rsn_ie_len;
4196 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4197 &iwe, bss->rsn_ie);
4198 }
4199
4200 if (bss && bss->ht_ie) {
4201 memset(&iwe, 0, sizeof(iwe));
4202 iwe.cmd = IWEVGENIE;
4203 iwe.u.data.length = bss->ht_ie_len;
4204 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4205 &iwe, bss->ht_ie);
4206 }
4207
4208 if (bss && bss->supp_rates_len > 0) {
4209 /* display all supported rates in readable format */
4210 char *p = current_ev + iwe_stream_lcp_len(info);
4211 int i;
4212
4213 memset(&iwe, 0, sizeof(iwe));
4214 iwe.cmd = SIOCGIWRATE;
4215 /* Those two flags are ignored... */
4216 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
4217
4218 for (i = 0; i < bss->supp_rates_len; i++) {
4219 iwe.u.bitrate.value = ((bss->supp_rates[i] &
4220 0x7f) * 500000);
4221 p = iwe_stream_add_value(info, current_ev, p,
4222 end_buf, &iwe, IW_EV_PARAM_LEN);
4223 }
4224 current_ev = p;
4225 }
4226
4227 if (bss) {
4228 char *buf;
4229 buf = kmalloc(30, GFP_ATOMIC);
4230 if (buf) {
4231 memset(&iwe, 0, sizeof(iwe));
4232 iwe.cmd = IWEVCUSTOM;
4233 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
4234 iwe.u.data.length = strlen(buf);
4235 current_ev = iwe_stream_add_point(info, current_ev,
4236 end_buf,
4237 &iwe, buf);
4238 memset(&iwe, 0, sizeof(iwe));
4239 iwe.cmd = IWEVCUSTOM;
4240 sprintf(buf, " Last beacon: %dms ago",
4241 jiffies_to_msecs(jiffies - bss->last_update));
4242 iwe.u.data.length = strlen(buf);
4243 current_ev = iwe_stream_add_point(info, current_ev,
4244 end_buf, &iwe, buf);
4245 kfree(buf);
4246 }
4247 }
4248
4249 if (bss_mesh_cfg(bss)) {
4250 char *buf;
4251 u8 *cfg = bss_mesh_cfg(bss);
4252 buf = kmalloc(50, GFP_ATOMIC);
4253 if (buf) {
4254 memset(&iwe, 0, sizeof(iwe));
4255 iwe.cmd = IWEVCUSTOM;
4256 sprintf(buf, "Mesh network (version %d)", cfg[0]);
4257 iwe.u.data.length = strlen(buf);
4258 current_ev = iwe_stream_add_point(info, current_ev,
4259 end_buf,
4260 &iwe, buf);
4261 sprintf(buf, "Path Selection Protocol ID: "
4262 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
4263 cfg[4]);
4264 iwe.u.data.length = strlen(buf);
4265 current_ev = iwe_stream_add_point(info, current_ev,
4266 end_buf,
4267 &iwe, buf);
4268 sprintf(buf, "Path Selection Metric ID: "
4269 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
4270 cfg[8]);
4271 iwe.u.data.length = strlen(buf);
4272 current_ev = iwe_stream_add_point(info, current_ev,
4273 end_buf,
4274 &iwe, buf);
4275 sprintf(buf, "Congestion Control Mode ID: "
4276 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
4277 cfg[11], cfg[12]);
4278 iwe.u.data.length = strlen(buf);
4279 current_ev = iwe_stream_add_point(info, current_ev,
4280 end_buf,
4281 &iwe, buf);
4282 sprintf(buf, "Channel Precedence: "
4283 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
4284 cfg[15], cfg[16]);
4285 iwe.u.data.length = strlen(buf);
4286 current_ev = iwe_stream_add_point(info, current_ev,
4287 end_buf,
4288 &iwe, buf);
4289 kfree(buf);
4290 }
4291 }
4292
4293 return current_ev;
4294 }
4295
4296
4297 int ieee80211_sta_scan_results(struct net_device *dev,
4298 struct iw_request_info *info,
4299 char *buf, size_t len)
4300 {
4301 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4302 char *current_ev = buf;
4303 char *end_buf = buf + len;
4304 struct ieee80211_sta_bss *bss;
4305
4306 spin_lock_bh(&local->sta_bss_lock);
4307 list_for_each_entry(bss, &local->sta_bss_list, list) {
4308 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
4309 spin_unlock_bh(&local->sta_bss_lock);
4310 return -E2BIG;
4311 }
4312 current_ev = ieee80211_sta_scan_result(dev, info, bss,
4313 current_ev, end_buf);
4314 }
4315 spin_unlock_bh(&local->sta_bss_lock);
4316 return current_ev - buf;
4317 }
4318
4319
4320 int ieee80211_sta_set_extra_ie(struct net_device *dev, char *ie, size_t len)
4321 {
4322 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4323 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4324
4325 kfree(ifsta->extra_ie);
4326 if (len == 0) {
4327 ifsta->extra_ie = NULL;
4328 ifsta->extra_ie_len = 0;
4329 return 0;
4330 }
4331 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
4332 if (!ifsta->extra_ie) {
4333 ifsta->extra_ie_len = 0;
4334 return -ENOMEM;
4335 }
4336 memcpy(ifsta->extra_ie, ie, len);
4337 ifsta->extra_ie_len = len;
4338 return 0;
4339 }
4340
4341
4342 struct sta_info *ieee80211_ibss_add_sta(struct net_device *dev,
4343 struct sk_buff *skb, u8 *bssid,
4344 u8 *addr, u64 supp_rates)
4345 {
4346 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4347 struct sta_info *sta;
4348 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4349 DECLARE_MAC_BUF(mac);
4350 int band = local->hw.conf.channel->band;
4351
4352 /* TODO: Could consider removing the least recently used entry and
4353 * allow new one to be added. */
4354 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
4355 if (net_ratelimit()) {
4356 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
4357 "entry %s\n", dev->name, print_mac(mac, addr));
4358 }
4359 return NULL;
4360 }
4361
4362 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
4363 return NULL;
4364
4365 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
4366 printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
4367 wiphy_name(local->hw.wiphy), print_mac(mac, addr), dev->name);
4368 #endif
4369
4370 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
4371 if (!sta)
4372 return NULL;
4373
4374 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
4375
4376 if (supp_rates)
4377 sta->supp_rates[band] = supp_rates;
4378 else
4379 sta->supp_rates[band] = sdata->u.sta.supp_rates_bits[band];
4380
4381 rate_control_rate_init(sta, local);
4382
4383 if (sta_info_insert(sta))
4384 return NULL;
4385
4386 return sta;
4387 }
4388
4389
4390 int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason)
4391 {
4392 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4393 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4394
4395 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
4396 dev->name, reason);
4397
4398 if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
4399 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
4400 return -EINVAL;
4401
4402 ieee80211_send_deauth(dev, ifsta, reason);
4403 ieee80211_set_disassoc(dev, ifsta, 1);
4404 return 0;
4405 }
4406
4407
4408 int ieee80211_sta_disassociate(struct net_device *dev, u16 reason)
4409 {
4410 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4411 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4412
4413 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
4414 dev->name, reason);
4415
4416 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4417 return -EINVAL;
4418
4419 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
4420 return -1;
4421
4422 ieee80211_send_disassoc(dev, ifsta, reason);
4423 ieee80211_set_disassoc(dev, ifsta, 0);
4424 return 0;
4425 }
4426
4427 void ieee80211_notify_mac(struct ieee80211_hw *hw,
4428 enum ieee80211_notification_types notif_type)
4429 {
4430 struct ieee80211_local *local = hw_to_local(hw);
4431 struct ieee80211_sub_if_data *sdata;
4432
4433 switch (notif_type) {
4434 case IEEE80211_NOTIFY_RE_ASSOC:
4435 rcu_read_lock();
4436 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4437 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4438 continue;
4439
4440 ieee80211_sta_req_auth(sdata->dev, &sdata->u.sta);
4441 }
4442 rcu_read_unlock();
4443 break;
4444 }
4445 }
4446 EXPORT_SYMBOL(ieee80211_notify_mac);
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