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mac80211: pass dtim_period to low level driver
[mirror_ubuntu-artful-kernel.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 /* TODO:
15 * order BSS list by RSSI(?) ("quality of AP")
16 * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
17 * SSID)
18 */
19 #include <linux/delay.h>
20 #include <linux/if_ether.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
23 #include <linux/if_arp.h>
24 #include <linux/wireless.h>
25 #include <linux/random.h>
26 #include <linux/etherdevice.h>
27 #include <linux/rtnetlink.h>
28 #include <net/iw_handler.h>
29 #include <asm/types.h>
30
31 #include <net/mac80211.h>
32 #include "ieee80211_i.h"
33 #include "rate.h"
34 #include "led.h"
35 #include "mesh.h"
36
37 #define IEEE80211_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 sdata->bss_conf.dtim_period = bss->dtim_period;
555
556 changed |= ieee80211_handle_bss_capability(sdata, bss);
557
558 ieee80211_rx_bss_put(local, bss);
559 }
560
561 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
562 changed |= BSS_CHANGED_HT;
563 sdata->bss_conf.assoc_ht = 1;
564 sdata->bss_conf.ht_conf = &conf->ht_conf;
565 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
566 }
567
568 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
569 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
570 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
571 ieee80211_sta_send_associnfo(dev, ifsta);
572 } else {
573 netif_carrier_off(dev);
574 ieee80211_sta_tear_down_BA_sessions(dev, ifsta->bssid);
575 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
576 changed |= ieee80211_reset_erp_info(dev);
577
578 sdata->bss_conf.assoc_ht = 0;
579 sdata->bss_conf.ht_conf = NULL;
580 sdata->bss_conf.ht_bss_conf = NULL;
581
582 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
583 }
584 ifsta->last_probe = jiffies;
585 ieee80211_led_assoc(local, assoc);
586
587 sdata->bss_conf.assoc = assoc;
588 ieee80211_bss_info_change_notify(sdata, changed);
589
590 if (assoc)
591 netif_carrier_on(dev);
592
593 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
594 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
595 }
596
597 static void ieee80211_set_disassoc(struct net_device *dev,
598 struct ieee80211_if_sta *ifsta, int deauth)
599 {
600 if (deauth)
601 ifsta->auth_tries = 0;
602 ifsta->assoc_tries = 0;
603 ieee80211_set_associated(dev, ifsta, 0);
604 }
605
606 void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
607 int encrypt)
608 {
609 struct ieee80211_sub_if_data *sdata;
610
611 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
612 skb->dev = sdata->local->mdev;
613 skb_set_mac_header(skb, 0);
614 skb_set_network_header(skb, 0);
615 skb_set_transport_header(skb, 0);
616
617 skb->iif = sdata->dev->ifindex;
618 skb->do_not_encrypt = !encrypt;
619
620 dev_queue_xmit(skb);
621 }
622
623
624 static void ieee80211_send_auth(struct net_device *dev,
625 struct ieee80211_if_sta *ifsta,
626 int transaction, u8 *extra, size_t extra_len,
627 int encrypt)
628 {
629 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
630 struct sk_buff *skb;
631 struct ieee80211_mgmt *mgmt;
632
633 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
634 sizeof(*mgmt) + 6 + extra_len);
635 if (!skb) {
636 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
637 "frame\n", dev->name);
638 return;
639 }
640 skb_reserve(skb, local->hw.extra_tx_headroom);
641
642 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
643 memset(mgmt, 0, 24 + 6);
644 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
645 IEEE80211_STYPE_AUTH);
646 if (encrypt)
647 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
648 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
649 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
650 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
651 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
652 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
653 ifsta->auth_transaction = transaction + 1;
654 mgmt->u.auth.status_code = cpu_to_le16(0);
655 if (extra)
656 memcpy(skb_put(skb, extra_len), extra, extra_len);
657
658 ieee80211_sta_tx(dev, skb, encrypt);
659 }
660
661
662 static void ieee80211_authenticate(struct net_device *dev,
663 struct ieee80211_if_sta *ifsta)
664 {
665 DECLARE_MAC_BUF(mac);
666
667 ifsta->auth_tries++;
668 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
669 printk(KERN_DEBUG "%s: authentication with AP %s"
670 " timed out\n",
671 dev->name, print_mac(mac, ifsta->bssid));
672 ifsta->state = IEEE80211_DISABLED;
673 return;
674 }
675
676 ifsta->state = IEEE80211_AUTHENTICATE;
677 printk(KERN_DEBUG "%s: authenticate with AP %s\n",
678 dev->name, print_mac(mac, ifsta->bssid));
679
680 ieee80211_send_auth(dev, ifsta, 1, NULL, 0, 0);
681
682 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
683 }
684
685 static int ieee80211_compatible_rates(struct ieee80211_sta_bss *bss,
686 struct ieee80211_supported_band *sband,
687 u64 *rates)
688 {
689 int i, j, count;
690 *rates = 0;
691 count = 0;
692 for (i = 0; i < bss->supp_rates_len; i++) {
693 int rate = (bss->supp_rates[i] & 0x7F) * 5;
694
695 for (j = 0; j < sband->n_bitrates; j++)
696 if (sband->bitrates[j].bitrate == rate) {
697 *rates |= BIT(j);
698 count++;
699 break;
700 }
701 }
702
703 return count;
704 }
705
706 static void ieee80211_send_assoc(struct net_device *dev,
707 struct ieee80211_if_sta *ifsta)
708 {
709 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
710 struct sk_buff *skb;
711 struct ieee80211_mgmt *mgmt;
712 u8 *pos, *ies;
713 int i, len, count, rates_len, supp_rates_len;
714 u16 capab;
715 struct ieee80211_sta_bss *bss;
716 int wmm = 0;
717 struct ieee80211_supported_band *sband;
718 u64 rates = 0;
719
720 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
721 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
722 ifsta->ssid_len);
723 if (!skb) {
724 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
725 "frame\n", dev->name);
726 return;
727 }
728 skb_reserve(skb, local->hw.extra_tx_headroom);
729
730 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
731
732 capab = ifsta->capab;
733
734 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
735 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
736 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
737 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
738 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
739 }
740
741 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
742 local->hw.conf.channel->center_freq,
743 ifsta->ssid, ifsta->ssid_len);
744 if (bss) {
745 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
746 capab |= WLAN_CAPABILITY_PRIVACY;
747 if (bss->wmm_ie)
748 wmm = 1;
749
750 /* get all rates supported by the device and the AP as
751 * some APs don't like getting a superset of their rates
752 * in the association request (e.g. D-Link DAP 1353 in
753 * b-only mode) */
754 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
755
756 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
757 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
758 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
759
760 ieee80211_rx_bss_put(local, bss);
761 } else {
762 rates = ~0;
763 rates_len = sband->n_bitrates;
764 }
765
766 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
767 memset(mgmt, 0, 24);
768 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
769 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
770 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
771
772 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
773 skb_put(skb, 10);
774 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
775 IEEE80211_STYPE_REASSOC_REQ);
776 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
777 mgmt->u.reassoc_req.listen_interval = cpu_to_le16(1);
778 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
779 ETH_ALEN);
780 } else {
781 skb_put(skb, 4);
782 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
783 IEEE80211_STYPE_ASSOC_REQ);
784 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
785 mgmt->u.assoc_req.listen_interval = cpu_to_le16(1);
786 }
787
788 /* SSID */
789 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
790 *pos++ = WLAN_EID_SSID;
791 *pos++ = ifsta->ssid_len;
792 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
793
794 /* add all rates which were marked to be used above */
795 supp_rates_len = rates_len;
796 if (supp_rates_len > 8)
797 supp_rates_len = 8;
798
799 len = sband->n_bitrates;
800 pos = skb_put(skb, supp_rates_len + 2);
801 *pos++ = WLAN_EID_SUPP_RATES;
802 *pos++ = supp_rates_len;
803
804 count = 0;
805 for (i = 0; i < sband->n_bitrates; i++) {
806 if (BIT(i) & rates) {
807 int rate = sband->bitrates[i].bitrate;
808 *pos++ = (u8) (rate / 5);
809 if (++count == 8)
810 break;
811 }
812 }
813
814 if (count == 8) {
815 pos = skb_put(skb, rates_len - count + 2);
816 *pos++ = WLAN_EID_EXT_SUPP_RATES;
817 *pos++ = rates_len - count;
818
819 for (i++; i < sband->n_bitrates; i++) {
820 if (BIT(i) & rates) {
821 int rate = sband->bitrates[i].bitrate;
822 *pos++ = (u8) (rate / 5);
823 }
824 }
825 }
826
827 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
828 /* 1. power capabilities */
829 pos = skb_put(skb, 4);
830 *pos++ = WLAN_EID_PWR_CAPABILITY;
831 *pos++ = 2;
832 *pos++ = 0; /* min tx power */
833 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
834
835 /* 2. supported channels */
836 /* TODO: get this in reg domain format */
837 pos = skb_put(skb, 2 * sband->n_channels + 2);
838 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
839 *pos++ = 2 * sband->n_channels;
840 for (i = 0; i < sband->n_channels; i++) {
841 *pos++ = ieee80211_frequency_to_channel(
842 sband->channels[i].center_freq);
843 *pos++ = 1; /* one channel in the subband*/
844 }
845 }
846
847 if (ifsta->extra_ie) {
848 pos = skb_put(skb, ifsta->extra_ie_len);
849 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
850 }
851
852 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
853 pos = skb_put(skb, 9);
854 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
855 *pos++ = 7; /* len */
856 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
857 *pos++ = 0x50;
858 *pos++ = 0xf2;
859 *pos++ = 2; /* WME */
860 *pos++ = 0; /* WME info */
861 *pos++ = 1; /* WME ver */
862 *pos++ = 0;
863 }
864
865 /* wmm support is a must to HT */
866 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
867 sband->ht_info.ht_supported && bss->ht_add_ie) {
868 struct ieee80211_ht_addt_info *ht_add_info =
869 (struct ieee80211_ht_addt_info *)bss->ht_add_ie;
870 u16 cap = sband->ht_info.cap;
871 __le16 tmp;
872 u32 flags = local->hw.conf.channel->flags;
873
874 switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
875 case IEEE80211_HT_IE_CHA_SEC_ABOVE:
876 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
877 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
878 cap &= ~IEEE80211_HT_CAP_SGI_40;
879 }
880 break;
881 case IEEE80211_HT_IE_CHA_SEC_BELOW:
882 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
883 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
884 cap &= ~IEEE80211_HT_CAP_SGI_40;
885 }
886 break;
887 }
888
889 tmp = cpu_to_le16(cap);
890 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
891 *pos++ = WLAN_EID_HT_CAPABILITY;
892 *pos++ = sizeof(struct ieee80211_ht_cap);
893 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
894 memcpy(pos, &tmp, sizeof(u16));
895 pos += sizeof(u16);
896 /* TODO: needs a define here for << 2 */
897 *pos++ = sband->ht_info.ampdu_factor |
898 (sband->ht_info.ampdu_density << 2);
899 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
900 }
901
902 kfree(ifsta->assocreq_ies);
903 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
904 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
905 if (ifsta->assocreq_ies)
906 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
907
908 ieee80211_sta_tx(dev, skb, 0);
909 }
910
911
912 static void ieee80211_send_deauth(struct net_device *dev,
913 struct ieee80211_if_sta *ifsta, u16 reason)
914 {
915 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
916 struct sk_buff *skb;
917 struct ieee80211_mgmt *mgmt;
918
919 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
920 if (!skb) {
921 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
922 "frame\n", dev->name);
923 return;
924 }
925 skb_reserve(skb, local->hw.extra_tx_headroom);
926
927 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
928 memset(mgmt, 0, 24);
929 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
930 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
931 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
932 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
933 IEEE80211_STYPE_DEAUTH);
934 skb_put(skb, 2);
935 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
936
937 ieee80211_sta_tx(dev, skb, 0);
938 }
939
940
941 static void ieee80211_send_disassoc(struct net_device *dev,
942 struct ieee80211_if_sta *ifsta, u16 reason)
943 {
944 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
945 struct sk_buff *skb;
946 struct ieee80211_mgmt *mgmt;
947
948 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
949 if (!skb) {
950 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
951 "frame\n", dev->name);
952 return;
953 }
954 skb_reserve(skb, local->hw.extra_tx_headroom);
955
956 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
957 memset(mgmt, 0, 24);
958 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
959 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
960 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
961 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
962 IEEE80211_STYPE_DISASSOC);
963 skb_put(skb, 2);
964 mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
965
966 ieee80211_sta_tx(dev, skb, 0);
967 }
968
969
970 static int ieee80211_privacy_mismatch(struct net_device *dev,
971 struct ieee80211_if_sta *ifsta)
972 {
973 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
974 struct ieee80211_sta_bss *bss;
975 int bss_privacy;
976 int wep_privacy;
977 int privacy_invoked;
978
979 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
980 return 0;
981
982 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
983 local->hw.conf.channel->center_freq,
984 ifsta->ssid, ifsta->ssid_len);
985 if (!bss)
986 return 0;
987
988 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
989 wep_privacy = !!ieee80211_sta_wep_configured(dev);
990 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
991
992 ieee80211_rx_bss_put(local, bss);
993
994 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
995 return 0;
996
997 return 1;
998 }
999
1000
1001 static void ieee80211_associate(struct net_device *dev,
1002 struct ieee80211_if_sta *ifsta)
1003 {
1004 DECLARE_MAC_BUF(mac);
1005
1006 ifsta->assoc_tries++;
1007 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1008 printk(KERN_DEBUG "%s: association with AP %s"
1009 " timed out\n",
1010 dev->name, print_mac(mac, ifsta->bssid));
1011 ifsta->state = IEEE80211_DISABLED;
1012 return;
1013 }
1014
1015 ifsta->state = IEEE80211_ASSOCIATE;
1016 printk(KERN_DEBUG "%s: associate with AP %s\n",
1017 dev->name, print_mac(mac, ifsta->bssid));
1018 if (ieee80211_privacy_mismatch(dev, ifsta)) {
1019 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1020 "mixed-cell disabled - abort association\n", dev->name);
1021 ifsta->state = IEEE80211_DISABLED;
1022 return;
1023 }
1024
1025 ieee80211_send_assoc(dev, ifsta);
1026
1027 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1028 }
1029
1030
1031 static void ieee80211_associated(struct net_device *dev,
1032 struct ieee80211_if_sta *ifsta)
1033 {
1034 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1035 struct sta_info *sta;
1036 int disassoc;
1037 DECLARE_MAC_BUF(mac);
1038
1039 /* TODO: start monitoring current AP signal quality and number of
1040 * missed beacons. Scan other channels every now and then and search
1041 * for better APs. */
1042 /* TODO: remove expired BSSes */
1043
1044 ifsta->state = IEEE80211_ASSOCIATED;
1045
1046 rcu_read_lock();
1047
1048 sta = sta_info_get(local, ifsta->bssid);
1049 if (!sta) {
1050 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
1051 dev->name, print_mac(mac, ifsta->bssid));
1052 disassoc = 1;
1053 } else {
1054 disassoc = 0;
1055 if (time_after(jiffies,
1056 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1057 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1058 printk(KERN_DEBUG "%s: No ProbeResp from "
1059 "current AP %s - assume out of "
1060 "range\n",
1061 dev->name, print_mac(mac, ifsta->bssid));
1062 disassoc = 1;
1063 sta_info_unlink(&sta);
1064 } else
1065 ieee80211_send_probe_req(dev, ifsta->bssid,
1066 local->scan_ssid,
1067 local->scan_ssid_len);
1068 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1069 } else {
1070 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1071 if (time_after(jiffies, ifsta->last_probe +
1072 IEEE80211_PROBE_INTERVAL)) {
1073 ifsta->last_probe = jiffies;
1074 ieee80211_send_probe_req(dev, ifsta->bssid,
1075 ifsta->ssid,
1076 ifsta->ssid_len);
1077 }
1078 }
1079 }
1080
1081 rcu_read_unlock();
1082
1083 if (disassoc && sta)
1084 sta_info_destroy(sta);
1085
1086 if (disassoc) {
1087 ifsta->state = IEEE80211_DISABLED;
1088 ieee80211_set_associated(dev, ifsta, 0);
1089 } else {
1090 mod_timer(&ifsta->timer, jiffies +
1091 IEEE80211_MONITORING_INTERVAL);
1092 }
1093 }
1094
1095
1096 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
1097 u8 *ssid, size_t ssid_len)
1098 {
1099 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1100 struct ieee80211_supported_band *sband;
1101 struct sk_buff *skb;
1102 struct ieee80211_mgmt *mgmt;
1103 u8 *pos, *supp_rates, *esupp_rates = NULL;
1104 int i;
1105
1106 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
1107 if (!skb) {
1108 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1109 "request\n", dev->name);
1110 return;
1111 }
1112 skb_reserve(skb, local->hw.extra_tx_headroom);
1113
1114 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1115 memset(mgmt, 0, 24);
1116 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1117 IEEE80211_STYPE_PROBE_REQ);
1118 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1119 if (dst) {
1120 memcpy(mgmt->da, dst, ETH_ALEN);
1121 memcpy(mgmt->bssid, dst, ETH_ALEN);
1122 } else {
1123 memset(mgmt->da, 0xff, ETH_ALEN);
1124 memset(mgmt->bssid, 0xff, ETH_ALEN);
1125 }
1126 pos = skb_put(skb, 2 + ssid_len);
1127 *pos++ = WLAN_EID_SSID;
1128 *pos++ = ssid_len;
1129 memcpy(pos, ssid, ssid_len);
1130
1131 supp_rates = skb_put(skb, 2);
1132 supp_rates[0] = WLAN_EID_SUPP_RATES;
1133 supp_rates[1] = 0;
1134 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1135
1136 for (i = 0; i < sband->n_bitrates; i++) {
1137 struct ieee80211_rate *rate = &sband->bitrates[i];
1138 if (esupp_rates) {
1139 pos = skb_put(skb, 1);
1140 esupp_rates[1]++;
1141 } else if (supp_rates[1] == 8) {
1142 esupp_rates = skb_put(skb, 3);
1143 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
1144 esupp_rates[1] = 1;
1145 pos = &esupp_rates[2];
1146 } else {
1147 pos = skb_put(skb, 1);
1148 supp_rates[1]++;
1149 }
1150 *pos = rate->bitrate / 5;
1151 }
1152
1153 ieee80211_sta_tx(dev, skb, 0);
1154 }
1155
1156
1157 static int ieee80211_sta_wep_configured(struct net_device *dev)
1158 {
1159 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1160 if (!sdata || !sdata->default_key ||
1161 sdata->default_key->conf.alg != ALG_WEP)
1162 return 0;
1163 return 1;
1164 }
1165
1166
1167 static void ieee80211_auth_completed(struct net_device *dev,
1168 struct ieee80211_if_sta *ifsta)
1169 {
1170 printk(KERN_DEBUG "%s: authenticated\n", dev->name);
1171 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1172 ieee80211_associate(dev, ifsta);
1173 }
1174
1175
1176 static void ieee80211_auth_challenge(struct net_device *dev,
1177 struct ieee80211_if_sta *ifsta,
1178 struct ieee80211_mgmt *mgmt,
1179 size_t len)
1180 {
1181 u8 *pos;
1182 struct ieee802_11_elems elems;
1183
1184 pos = mgmt->u.auth.variable;
1185 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1186 if (!elems.challenge)
1187 return;
1188 ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
1189 elems.challenge_len + 2, 1);
1190 }
1191
1192 static void ieee80211_send_addba_resp(struct net_device *dev, u8 *da, u16 tid,
1193 u8 dialog_token, u16 status, u16 policy,
1194 u16 buf_size, u16 timeout)
1195 {
1196 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1197 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1198 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1199 struct sk_buff *skb;
1200 struct ieee80211_mgmt *mgmt;
1201 u16 capab;
1202
1203 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1204
1205 if (!skb) {
1206 printk(KERN_DEBUG "%s: failed to allocate buffer "
1207 "for addba resp frame\n", dev->name);
1208 return;
1209 }
1210
1211 skb_reserve(skb, local->hw.extra_tx_headroom);
1212 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1213 memset(mgmt, 0, 24);
1214 memcpy(mgmt->da, da, ETH_ALEN);
1215 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1216 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1217 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1218 else
1219 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1220 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1221 IEEE80211_STYPE_ACTION);
1222
1223 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
1224 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1225 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
1226 mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
1227
1228 capab = (u16)(policy << 1); /* bit 1 aggregation policy */
1229 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1230 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
1231
1232 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
1233 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
1234 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
1235
1236 ieee80211_sta_tx(dev, skb, 0);
1237
1238 return;
1239 }
1240
1241 void ieee80211_send_addba_request(struct net_device *dev, const u8 *da,
1242 u16 tid, u8 dialog_token, u16 start_seq_num,
1243 u16 agg_size, u16 timeout)
1244 {
1245 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1246 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1247 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1248 struct sk_buff *skb;
1249 struct ieee80211_mgmt *mgmt;
1250 u16 capab;
1251
1252 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1253
1254 if (!skb) {
1255 printk(KERN_ERR "%s: failed to allocate buffer "
1256 "for addba request frame\n", dev->name);
1257 return;
1258 }
1259 skb_reserve(skb, local->hw.extra_tx_headroom);
1260 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1261 memset(mgmt, 0, 24);
1262 memcpy(mgmt->da, da, ETH_ALEN);
1263 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1264 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1265 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1266 else
1267 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1268
1269 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1270 IEEE80211_STYPE_ACTION);
1271
1272 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
1273
1274 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1275 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
1276
1277 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
1278 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
1279 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1280 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
1281
1282 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
1283
1284 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
1285 mgmt->u.action.u.addba_req.start_seq_num =
1286 cpu_to_le16(start_seq_num << 4);
1287
1288 ieee80211_sta_tx(dev, skb, 0);
1289 }
1290
1291 static void ieee80211_sta_process_addba_request(struct net_device *dev,
1292 struct ieee80211_mgmt *mgmt,
1293 size_t len)
1294 {
1295 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1296 struct ieee80211_hw *hw = &local->hw;
1297 struct ieee80211_conf *conf = &hw->conf;
1298 struct sta_info *sta;
1299 struct tid_ampdu_rx *tid_agg_rx;
1300 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
1301 u8 dialog_token;
1302 int ret = -EOPNOTSUPP;
1303 DECLARE_MAC_BUF(mac);
1304
1305 rcu_read_lock();
1306
1307 sta = sta_info_get(local, mgmt->sa);
1308 if (!sta) {
1309 rcu_read_unlock();
1310 return;
1311 }
1312
1313 /* extract session parameters from addba request frame */
1314 dialog_token = mgmt->u.action.u.addba_req.dialog_token;
1315 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
1316 start_seq_num =
1317 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
1318
1319 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
1320 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
1321 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1322 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
1323
1324 status = WLAN_STATUS_REQUEST_DECLINED;
1325
1326 /* sanity check for incoming parameters:
1327 * check if configuration can support the BA policy
1328 * and if buffer size does not exceeds max value */
1329 if (((ba_policy != 1)
1330 && (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA)))
1331 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
1332 status = WLAN_STATUS_INVALID_QOS_PARAM;
1333 #ifdef CONFIG_MAC80211_HT_DEBUG
1334 if (net_ratelimit())
1335 printk(KERN_DEBUG "AddBA Req with bad params from "
1336 "%s on tid %u. policy %d, buffer size %d\n",
1337 print_mac(mac, mgmt->sa), tid, ba_policy,
1338 buf_size);
1339 #endif /* CONFIG_MAC80211_HT_DEBUG */
1340 goto end_no_lock;
1341 }
1342 /* determine default buffer size */
1343 if (buf_size == 0) {
1344 struct ieee80211_supported_band *sband;
1345
1346 sband = local->hw.wiphy->bands[conf->channel->band];
1347 buf_size = IEEE80211_MIN_AMPDU_BUF;
1348 buf_size = buf_size << sband->ht_info.ampdu_factor;
1349 }
1350
1351
1352 /* examine state machine */
1353 spin_lock_bh(&sta->lock);
1354
1355 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
1356 #ifdef CONFIG_MAC80211_HT_DEBUG
1357 if (net_ratelimit())
1358 printk(KERN_DEBUG "unexpected AddBA Req from "
1359 "%s on tid %u\n",
1360 print_mac(mac, mgmt->sa), tid);
1361 #endif /* CONFIG_MAC80211_HT_DEBUG */
1362 goto end;
1363 }
1364
1365 /* prepare A-MPDU MLME for Rx aggregation */
1366 sta->ampdu_mlme.tid_rx[tid] =
1367 kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
1368 if (!sta->ampdu_mlme.tid_rx[tid]) {
1369 #ifdef CONFIG_MAC80211_HT_DEBUG
1370 if (net_ratelimit())
1371 printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
1372 tid);
1373 #endif
1374 goto end;
1375 }
1376 /* rx timer */
1377 sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
1378 sta_rx_agg_session_timer_expired;
1379 sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
1380 (unsigned long)&sta->timer_to_tid[tid];
1381 init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1382
1383 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
1384
1385 /* prepare reordering buffer */
1386 tid_agg_rx->reorder_buf =
1387 kmalloc(buf_size * sizeof(struct sk_buff *), GFP_ATOMIC);
1388 if (!tid_agg_rx->reorder_buf) {
1389 #ifdef CONFIG_MAC80211_HT_DEBUG
1390 if (net_ratelimit())
1391 printk(KERN_ERR "can not allocate reordering buffer "
1392 "to tid %d\n", tid);
1393 #endif
1394 kfree(sta->ampdu_mlme.tid_rx[tid]);
1395 goto end;
1396 }
1397 memset(tid_agg_rx->reorder_buf, 0,
1398 buf_size * sizeof(struct sk_buff *));
1399
1400 if (local->ops->ampdu_action)
1401 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
1402 sta->addr, tid, &start_seq_num);
1403 #ifdef CONFIG_MAC80211_HT_DEBUG
1404 printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
1405 #endif /* CONFIG_MAC80211_HT_DEBUG */
1406
1407 if (ret) {
1408 kfree(tid_agg_rx->reorder_buf);
1409 kfree(tid_agg_rx);
1410 sta->ampdu_mlme.tid_rx[tid] = NULL;
1411 goto end;
1412 }
1413
1414 /* change state and send addba resp */
1415 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
1416 tid_agg_rx->dialog_token = dialog_token;
1417 tid_agg_rx->ssn = start_seq_num;
1418 tid_agg_rx->head_seq_num = start_seq_num;
1419 tid_agg_rx->buf_size = buf_size;
1420 tid_agg_rx->timeout = timeout;
1421 tid_agg_rx->stored_mpdu_num = 0;
1422 status = WLAN_STATUS_SUCCESS;
1423 end:
1424 spin_unlock_bh(&sta->lock);
1425
1426 end_no_lock:
1427 ieee80211_send_addba_resp(sta->sdata->dev, sta->addr, tid,
1428 dialog_token, status, 1, buf_size, timeout);
1429 rcu_read_unlock();
1430 }
1431
1432 static void ieee80211_sta_process_addba_resp(struct net_device *dev,
1433 struct ieee80211_mgmt *mgmt,
1434 size_t len)
1435 {
1436 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1437 struct ieee80211_hw *hw = &local->hw;
1438 struct sta_info *sta;
1439 u16 capab;
1440 u16 tid;
1441 u8 *state;
1442
1443 rcu_read_lock();
1444
1445 sta = sta_info_get(local, mgmt->sa);
1446 if (!sta) {
1447 rcu_read_unlock();
1448 return;
1449 }
1450
1451 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
1452 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1453
1454 state = &sta->ampdu_mlme.tid_state_tx[tid];
1455
1456 spin_lock_bh(&sta->lock);
1457
1458 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1459 spin_unlock_bh(&sta->lock);
1460 goto addba_resp_exit;
1461 }
1462
1463 if (mgmt->u.action.u.addba_resp.dialog_token !=
1464 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
1465 spin_unlock_bh(&sta->lock);
1466 #ifdef CONFIG_MAC80211_HT_DEBUG
1467 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
1468 #endif /* CONFIG_MAC80211_HT_DEBUG */
1469 goto addba_resp_exit;
1470 }
1471
1472 del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
1473 #ifdef CONFIG_MAC80211_HT_DEBUG
1474 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
1475 #endif /* CONFIG_MAC80211_HT_DEBUG */
1476 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
1477 == WLAN_STATUS_SUCCESS) {
1478 *state |= HT_ADDBA_RECEIVED_MSK;
1479 sta->ampdu_mlme.addba_req_num[tid] = 0;
1480
1481 if (*state == HT_AGG_STATE_OPERATIONAL)
1482 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
1483
1484 spin_unlock_bh(&sta->lock);
1485 } else {
1486 sta->ampdu_mlme.addba_req_num[tid]++;
1487 /* this will allow the state check in stop_BA_session */
1488 *state = HT_AGG_STATE_OPERATIONAL;
1489 spin_unlock_bh(&sta->lock);
1490 ieee80211_stop_tx_ba_session(hw, sta->addr, tid,
1491 WLAN_BACK_INITIATOR);
1492 }
1493
1494 addba_resp_exit:
1495 rcu_read_unlock();
1496 }
1497
1498 void ieee80211_send_delba(struct net_device *dev, const u8 *da, u16 tid,
1499 u16 initiator, u16 reason_code)
1500 {
1501 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1502 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1503 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1504 struct sk_buff *skb;
1505 struct ieee80211_mgmt *mgmt;
1506 u16 params;
1507
1508 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1509
1510 if (!skb) {
1511 printk(KERN_ERR "%s: failed to allocate buffer "
1512 "for delba frame\n", dev->name);
1513 return;
1514 }
1515
1516 skb_reserve(skb, local->hw.extra_tx_headroom);
1517 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1518 memset(mgmt, 0, 24);
1519 memcpy(mgmt->da, da, ETH_ALEN);
1520 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1521 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1522 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1523 else
1524 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1525 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1526 IEEE80211_STYPE_ACTION);
1527
1528 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
1529
1530 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1531 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
1532 params = (u16)(initiator << 11); /* bit 11 initiator */
1533 params |= (u16)(tid << 12); /* bit 15:12 TID number */
1534
1535 mgmt->u.action.u.delba.params = cpu_to_le16(params);
1536 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
1537
1538 ieee80211_sta_tx(dev, skb, 0);
1539 }
1540
1541 void ieee80211_send_bar(struct net_device *dev, u8 *ra, u16 tid, u16 ssn)
1542 {
1543 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1544 struct sk_buff *skb;
1545 struct ieee80211_bar *bar;
1546 u16 bar_control = 0;
1547
1548 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
1549 if (!skb) {
1550 printk(KERN_ERR "%s: failed to allocate buffer for "
1551 "bar frame\n", dev->name);
1552 return;
1553 }
1554 skb_reserve(skb, local->hw.extra_tx_headroom);
1555 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
1556 memset(bar, 0, sizeof(*bar));
1557 bar->frame_control = IEEE80211_FC(IEEE80211_FTYPE_CTL,
1558 IEEE80211_STYPE_BACK_REQ);
1559 memcpy(bar->ra, ra, ETH_ALEN);
1560 memcpy(bar->ta, dev->dev_addr, ETH_ALEN);
1561 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
1562 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
1563 bar_control |= (u16)(tid << 12);
1564 bar->control = cpu_to_le16(bar_control);
1565 bar->start_seq_num = cpu_to_le16(ssn);
1566
1567 ieee80211_sta_tx(dev, skb, 0);
1568 }
1569
1570 void ieee80211_sta_stop_rx_ba_session(struct net_device *dev, u8 *ra, u16 tid,
1571 u16 initiator, u16 reason)
1572 {
1573 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1574 struct ieee80211_hw *hw = &local->hw;
1575 struct sta_info *sta;
1576 int ret, i;
1577 DECLARE_MAC_BUF(mac);
1578
1579 rcu_read_lock();
1580
1581 sta = sta_info_get(local, ra);
1582 if (!sta) {
1583 rcu_read_unlock();
1584 return;
1585 }
1586
1587 /* check if TID is in operational state */
1588 spin_lock_bh(&sta->lock);
1589 if (sta->ampdu_mlme.tid_state_rx[tid]
1590 != HT_AGG_STATE_OPERATIONAL) {
1591 spin_unlock_bh(&sta->lock);
1592 rcu_read_unlock();
1593 return;
1594 }
1595 sta->ampdu_mlme.tid_state_rx[tid] =
1596 HT_AGG_STATE_REQ_STOP_BA_MSK |
1597 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
1598 spin_unlock_bh(&sta->lock);
1599
1600 /* stop HW Rx aggregation. ampdu_action existence
1601 * already verified in session init so we add the BUG_ON */
1602 BUG_ON(!local->ops->ampdu_action);
1603
1604 #ifdef CONFIG_MAC80211_HT_DEBUG
1605 printk(KERN_DEBUG "Rx BA session stop requested for %s tid %u\n",
1606 print_mac(mac, ra), tid);
1607 #endif /* CONFIG_MAC80211_HT_DEBUG */
1608
1609 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
1610 ra, tid, NULL);
1611 if (ret)
1612 printk(KERN_DEBUG "HW problem - can not stop rx "
1613 "aggregation for tid %d\n", tid);
1614
1615 /* shutdown timer has not expired */
1616 if (initiator != WLAN_BACK_TIMER)
1617 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1618
1619 /* check if this is a self generated aggregation halt */
1620 if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
1621 ieee80211_send_delba(dev, ra, tid, 0, reason);
1622
1623 /* free the reordering buffer */
1624 for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
1625 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
1626 /* release the reordered frames */
1627 dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
1628 sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
1629 sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
1630 }
1631 }
1632 /* free resources */
1633 kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
1634 kfree(sta->ampdu_mlme.tid_rx[tid]);
1635 sta->ampdu_mlme.tid_rx[tid] = NULL;
1636 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
1637
1638 rcu_read_unlock();
1639 }
1640
1641
1642 static void ieee80211_sta_process_delba(struct net_device *dev,
1643 struct ieee80211_mgmt *mgmt, size_t len)
1644 {
1645 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1646 struct sta_info *sta;
1647 u16 tid, params;
1648 u16 initiator;
1649 DECLARE_MAC_BUF(mac);
1650
1651 rcu_read_lock();
1652
1653 sta = sta_info_get(local, mgmt->sa);
1654 if (!sta) {
1655 rcu_read_unlock();
1656 return;
1657 }
1658
1659 params = le16_to_cpu(mgmt->u.action.u.delba.params);
1660 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
1661 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
1662
1663 #ifdef CONFIG_MAC80211_HT_DEBUG
1664 if (net_ratelimit())
1665 printk(KERN_DEBUG "delba from %s (%s) tid %d reason code %d\n",
1666 print_mac(mac, mgmt->sa),
1667 initiator ? "initiator" : "recipient", tid,
1668 mgmt->u.action.u.delba.reason_code);
1669 #endif /* CONFIG_MAC80211_HT_DEBUG */
1670
1671 if (initiator == WLAN_BACK_INITIATOR)
1672 ieee80211_sta_stop_rx_ba_session(dev, sta->addr, tid,
1673 WLAN_BACK_INITIATOR, 0);
1674 else { /* WLAN_BACK_RECIPIENT */
1675 spin_lock_bh(&sta->lock);
1676 sta->ampdu_mlme.tid_state_tx[tid] =
1677 HT_AGG_STATE_OPERATIONAL;
1678 spin_unlock_bh(&sta->lock);
1679 ieee80211_stop_tx_ba_session(&local->hw, sta->addr, tid,
1680 WLAN_BACK_RECIPIENT);
1681 }
1682 rcu_read_unlock();
1683 }
1684
1685 /*
1686 * After sending add Block Ack request we activated a timer until
1687 * add Block Ack response will arrive from the recipient.
1688 * If this timer expires sta_addba_resp_timer_expired will be executed.
1689 */
1690 void sta_addba_resp_timer_expired(unsigned long data)
1691 {
1692 /* not an elegant detour, but there is no choice as the timer passes
1693 * only one argument, and both sta_info and TID are needed, so init
1694 * flow in sta_info_create gives the TID as data, while the timer_to_id
1695 * array gives the sta through container_of */
1696 u16 tid = *(u8 *)data;
1697 struct sta_info *temp_sta = container_of((void *)data,
1698 struct sta_info, timer_to_tid[tid]);
1699
1700 struct ieee80211_local *local = temp_sta->local;
1701 struct ieee80211_hw *hw = &local->hw;
1702 struct sta_info *sta;
1703 u8 *state;
1704
1705 rcu_read_lock();
1706
1707 sta = sta_info_get(local, temp_sta->addr);
1708 if (!sta) {
1709 rcu_read_unlock();
1710 return;
1711 }
1712
1713 state = &sta->ampdu_mlme.tid_state_tx[tid];
1714 /* check if the TID waits for addBA response */
1715 spin_lock_bh(&sta->lock);
1716 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1717 spin_unlock_bh(&sta->lock);
1718 *state = HT_AGG_STATE_IDLE;
1719 #ifdef CONFIG_MAC80211_HT_DEBUG
1720 printk(KERN_DEBUG "timer expired on tid %d but we are not "
1721 "expecting addBA response there", tid);
1722 #endif
1723 goto timer_expired_exit;
1724 }
1725
1726 #ifdef CONFIG_MAC80211_HT_DEBUG
1727 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
1728 #endif
1729
1730 /* go through the state check in stop_BA_session */
1731 *state = HT_AGG_STATE_OPERATIONAL;
1732 spin_unlock_bh(&sta->lock);
1733 ieee80211_stop_tx_ba_session(hw, temp_sta->addr, tid,
1734 WLAN_BACK_INITIATOR);
1735
1736 timer_expired_exit:
1737 rcu_read_unlock();
1738 }
1739
1740 /*
1741 * After accepting the AddBA Request we activated a timer,
1742 * resetting it after each frame that arrives from the originator.
1743 * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
1744 */
1745 static void sta_rx_agg_session_timer_expired(unsigned long data)
1746 {
1747 /* not an elegant detour, but there is no choice as the timer passes
1748 * only one argument, and various sta_info are needed here, so init
1749 * flow in sta_info_create gives the TID as data, while the timer_to_id
1750 * array gives the sta through container_of */
1751 u8 *ptid = (u8 *)data;
1752 u8 *timer_to_id = ptid - *ptid;
1753 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
1754 timer_to_tid[0]);
1755
1756 #ifdef CONFIG_MAC80211_HT_DEBUG
1757 printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
1758 #endif
1759 ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr,
1760 (u16)*ptid, WLAN_BACK_TIMER,
1761 WLAN_REASON_QSTA_TIMEOUT);
1762 }
1763
1764 void ieee80211_sta_tear_down_BA_sessions(struct net_device *dev, u8 *addr)
1765 {
1766 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1767 int i;
1768
1769 for (i = 0; i < STA_TID_NUM; i++) {
1770 ieee80211_stop_tx_ba_session(&local->hw, addr, i,
1771 WLAN_BACK_INITIATOR);
1772 ieee80211_sta_stop_rx_ba_session(dev, addr, i,
1773 WLAN_BACK_RECIPIENT,
1774 WLAN_REASON_QSTA_LEAVE_QBSS);
1775 }
1776 }
1777
1778 static void ieee80211_send_refuse_measurement_request(struct net_device *dev,
1779 struct ieee80211_msrment_ie *request_ie,
1780 const u8 *da, const u8 *bssid,
1781 u8 dialog_token)
1782 {
1783 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1784 struct sk_buff *skb;
1785 struct ieee80211_mgmt *msr_report;
1786
1787 skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
1788 sizeof(struct ieee80211_msrment_ie));
1789
1790 if (!skb) {
1791 printk(KERN_ERR "%s: failed to allocate buffer for "
1792 "measurement report frame\n", dev->name);
1793 return;
1794 }
1795
1796 skb_reserve(skb, local->hw.extra_tx_headroom);
1797 msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
1798 memset(msr_report, 0, 24);
1799 memcpy(msr_report->da, da, ETH_ALEN);
1800 memcpy(msr_report->sa, dev->dev_addr, ETH_ALEN);
1801 memcpy(msr_report->bssid, bssid, ETH_ALEN);
1802 msr_report->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1803 IEEE80211_STYPE_ACTION);
1804
1805 skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
1806 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
1807 msr_report->u.action.u.measurement.action_code =
1808 WLAN_ACTION_SPCT_MSR_RPRT;
1809 msr_report->u.action.u.measurement.dialog_token = dialog_token;
1810
1811 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
1812 msr_report->u.action.u.measurement.length =
1813 sizeof(struct ieee80211_msrment_ie);
1814
1815 memset(&msr_report->u.action.u.measurement.msr_elem, 0,
1816 sizeof(struct ieee80211_msrment_ie));
1817 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
1818 msr_report->u.action.u.measurement.msr_elem.mode |=
1819 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
1820 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
1821
1822 ieee80211_sta_tx(dev, skb, 0);
1823 }
1824
1825 static void ieee80211_sta_process_measurement_req(struct net_device *dev,
1826 struct ieee80211_mgmt *mgmt,
1827 size_t len)
1828 {
1829 /*
1830 * Ignoring measurement request is spec violation.
1831 * Mandatory measurements must be reported optional
1832 * measurements might be refused or reported incapable
1833 * For now just refuse
1834 * TODO: Answer basic measurement as unmeasured
1835 */
1836 ieee80211_send_refuse_measurement_request(dev,
1837 &mgmt->u.action.u.measurement.msr_elem,
1838 mgmt->sa, mgmt->bssid,
1839 mgmt->u.action.u.measurement.dialog_token);
1840 }
1841
1842
1843 static void ieee80211_rx_mgmt_auth(struct net_device *dev,
1844 struct ieee80211_if_sta *ifsta,
1845 struct ieee80211_mgmt *mgmt,
1846 size_t len)
1847 {
1848 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1849 u16 auth_alg, auth_transaction, status_code;
1850 DECLARE_MAC_BUF(mac);
1851
1852 if (ifsta->state != IEEE80211_AUTHENTICATE &&
1853 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1854 return;
1855
1856 if (len < 24 + 6)
1857 return;
1858
1859 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1860 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1861 return;
1862
1863 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1864 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1865 return;
1866
1867 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1868 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1869 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1870
1871 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1872 /*
1873 * IEEE 802.11 standard does not require authentication in IBSS
1874 * networks and most implementations do not seem to use it.
1875 * However, try to reply to authentication attempts if someone
1876 * has actually implemented this.
1877 */
1878 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1879 return;
1880 ieee80211_send_auth(dev, ifsta, 2, NULL, 0, 0);
1881 }
1882
1883 if (auth_alg != ifsta->auth_alg ||
1884 auth_transaction != ifsta->auth_transaction)
1885 return;
1886
1887 if (status_code != WLAN_STATUS_SUCCESS) {
1888 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1889 u8 algs[3];
1890 const int num_algs = ARRAY_SIZE(algs);
1891 int i, pos;
1892 algs[0] = algs[1] = algs[2] = 0xff;
1893 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1894 algs[0] = WLAN_AUTH_OPEN;
1895 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1896 algs[1] = WLAN_AUTH_SHARED_KEY;
1897 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1898 algs[2] = WLAN_AUTH_LEAP;
1899 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1900 pos = 0;
1901 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1902 pos = 1;
1903 else
1904 pos = 2;
1905 for (i = 0; i < num_algs; i++) {
1906 pos++;
1907 if (pos >= num_algs)
1908 pos = 0;
1909 if (algs[pos] == ifsta->auth_alg ||
1910 algs[pos] == 0xff)
1911 continue;
1912 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1913 !ieee80211_sta_wep_configured(dev))
1914 continue;
1915 ifsta->auth_alg = algs[pos];
1916 break;
1917 }
1918 }
1919 return;
1920 }
1921
1922 switch (ifsta->auth_alg) {
1923 case WLAN_AUTH_OPEN:
1924 case WLAN_AUTH_LEAP:
1925 ieee80211_auth_completed(dev, ifsta);
1926 break;
1927 case WLAN_AUTH_SHARED_KEY:
1928 if (ifsta->auth_transaction == 4)
1929 ieee80211_auth_completed(dev, ifsta);
1930 else
1931 ieee80211_auth_challenge(dev, ifsta, mgmt, len);
1932 break;
1933 }
1934 }
1935
1936
1937 static void ieee80211_rx_mgmt_deauth(struct net_device *dev,
1938 struct ieee80211_if_sta *ifsta,
1939 struct ieee80211_mgmt *mgmt,
1940 size_t len)
1941 {
1942 u16 reason_code;
1943 DECLARE_MAC_BUF(mac);
1944
1945 if (len < 24 + 2)
1946 return;
1947
1948 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1949 return;
1950
1951 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1952
1953 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1954 printk(KERN_DEBUG "%s: deauthenticated\n", dev->name);
1955
1956 if (ifsta->state == IEEE80211_AUTHENTICATE ||
1957 ifsta->state == IEEE80211_ASSOCIATE ||
1958 ifsta->state == IEEE80211_ASSOCIATED) {
1959 ifsta->state = IEEE80211_AUTHENTICATE;
1960 mod_timer(&ifsta->timer, jiffies +
1961 IEEE80211_RETRY_AUTH_INTERVAL);
1962 }
1963
1964 ieee80211_set_disassoc(dev, ifsta, 1);
1965 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1966 }
1967
1968
1969 static void ieee80211_rx_mgmt_disassoc(struct net_device *dev,
1970 struct ieee80211_if_sta *ifsta,
1971 struct ieee80211_mgmt *mgmt,
1972 size_t len)
1973 {
1974 u16 reason_code;
1975 DECLARE_MAC_BUF(mac);
1976
1977 if (len < 24 + 2)
1978 return;
1979
1980 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1981 return;
1982
1983 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1984
1985 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1986 printk(KERN_DEBUG "%s: disassociated\n", dev->name);
1987
1988 if (ifsta->state == IEEE80211_ASSOCIATED) {
1989 ifsta->state = IEEE80211_ASSOCIATE;
1990 mod_timer(&ifsta->timer, jiffies +
1991 IEEE80211_RETRY_AUTH_INTERVAL);
1992 }
1993
1994 ieee80211_set_disassoc(dev, ifsta, 0);
1995 }
1996
1997
1998 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1999 struct ieee80211_if_sta *ifsta,
2000 struct ieee80211_mgmt *mgmt,
2001 size_t len,
2002 int reassoc)
2003 {
2004 struct ieee80211_local *local = sdata->local;
2005 struct net_device *dev = sdata->dev;
2006 struct ieee80211_supported_band *sband;
2007 struct sta_info *sta;
2008 u64 rates, basic_rates;
2009 u16 capab_info, status_code, aid;
2010 struct ieee802_11_elems elems;
2011 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
2012 u8 *pos;
2013 int i, j;
2014 DECLARE_MAC_BUF(mac);
2015 bool have_higher_than_11mbit = false;
2016
2017 /* AssocResp and ReassocResp have identical structure, so process both
2018 * of them in this function. */
2019
2020 if (ifsta->state != IEEE80211_ASSOCIATE)
2021 return;
2022
2023 if (len < 24 + 6)
2024 return;
2025
2026 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
2027 return;
2028
2029 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2030 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2031 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2032
2033 printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
2034 "status=%d aid=%d)\n",
2035 dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
2036 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2037
2038 if (status_code != WLAN_STATUS_SUCCESS) {
2039 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
2040 dev->name, status_code);
2041 /* if this was a reassociation, ensure we try a "full"
2042 * association next time. This works around some broken APs
2043 * which do not correctly reject reassociation requests. */
2044 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2045 return;
2046 }
2047
2048 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2049 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
2050 "set\n", dev->name, aid);
2051 aid &= ~(BIT(15) | BIT(14));
2052
2053 pos = mgmt->u.assoc_resp.variable;
2054 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2055
2056 if (!elems.supp_rates) {
2057 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2058 dev->name);
2059 return;
2060 }
2061
2062 printk(KERN_DEBUG "%s: associated\n", dev->name);
2063 ifsta->aid = aid;
2064 ifsta->ap_capab = capab_info;
2065
2066 kfree(ifsta->assocresp_ies);
2067 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
2068 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
2069 if (ifsta->assocresp_ies)
2070 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
2071
2072 rcu_read_lock();
2073
2074 /* Add STA entry for the AP */
2075 sta = sta_info_get(local, ifsta->bssid);
2076 if (!sta) {
2077 struct ieee80211_sta_bss *bss;
2078 int err;
2079
2080 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
2081 if (!sta) {
2082 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
2083 " the AP\n", dev->name);
2084 rcu_read_unlock();
2085 return;
2086 }
2087 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
2088 local->hw.conf.channel->center_freq,
2089 ifsta->ssid, ifsta->ssid_len);
2090 if (bss) {
2091 sta->last_signal = bss->signal;
2092 sta->last_qual = bss->qual;
2093 sta->last_noise = bss->noise;
2094 ieee80211_rx_bss_put(local, bss);
2095 }
2096
2097 err = sta_info_insert(sta);
2098 if (err) {
2099 printk(KERN_DEBUG "%s: failed to insert STA entry for"
2100 " the AP (error %d)\n", dev->name, err);
2101 rcu_read_unlock();
2102 return;
2103 }
2104 }
2105
2106 /*
2107 * FIXME: Do we really need to update the sta_info's information here?
2108 * We already know about the AP (we found it in our list) so it
2109 * should already be filled with the right info, no?
2110 * As is stands, all this is racy because typically we assume
2111 * the information that is filled in here (except flags) doesn't
2112 * change while a STA structure is alive. As such, it should move
2113 * to between the sta_info_alloc() and sta_info_insert() above.
2114 */
2115
2116 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
2117 WLAN_STA_AUTHORIZED);
2118
2119 rates = 0;
2120 basic_rates = 0;
2121 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2122
2123 for (i = 0; i < elems.supp_rates_len; i++) {
2124 int rate = (elems.supp_rates[i] & 0x7f) * 5;
2125
2126 if (rate > 110)
2127 have_higher_than_11mbit = true;
2128
2129 for (j = 0; j < sband->n_bitrates; j++) {
2130 if (sband->bitrates[j].bitrate == rate)
2131 rates |= BIT(j);
2132 if (elems.supp_rates[i] & 0x80)
2133 basic_rates |= BIT(j);
2134 }
2135 }
2136
2137 for (i = 0; i < elems.ext_supp_rates_len; i++) {
2138 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
2139
2140 if (rate > 110)
2141 have_higher_than_11mbit = true;
2142
2143 for (j = 0; j < sband->n_bitrates; j++) {
2144 if (sband->bitrates[j].bitrate == rate)
2145 rates |= BIT(j);
2146 if (elems.ext_supp_rates[i] & 0x80)
2147 basic_rates |= BIT(j);
2148 }
2149 }
2150
2151 sta->supp_rates[local->hw.conf.channel->band] = rates;
2152 sdata->basic_rates = basic_rates;
2153
2154 /* cf. IEEE 802.11 9.2.12 */
2155 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
2156 have_higher_than_11mbit)
2157 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
2158 else
2159 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
2160
2161 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2162 (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
2163 struct ieee80211_ht_bss_info bss_info;
2164 ieee80211_ht_cap_ie_to_ht_info(
2165 (struct ieee80211_ht_cap *)
2166 elems.ht_cap_elem, &sta->ht_info);
2167 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2168 (struct ieee80211_ht_addt_info *)
2169 elems.ht_info_elem, &bss_info);
2170 ieee80211_handle_ht(local, 1, &sta->ht_info, &bss_info);
2171 }
2172
2173 rate_control_rate_init(sta, local);
2174
2175 if (elems.wmm_param) {
2176 set_sta_flags(sta, WLAN_STA_WME);
2177 rcu_read_unlock();
2178 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
2179 elems.wmm_param_len);
2180 } else
2181 rcu_read_unlock();
2182
2183 /* set AID and assoc capability,
2184 * ieee80211_set_associated() will tell the driver */
2185 bss_conf->aid = aid;
2186 bss_conf->assoc_capability = capab_info;
2187 ieee80211_set_associated(dev, ifsta, 1);
2188
2189 ieee80211_associated(dev, ifsta);
2190 }
2191
2192
2193 /* Caller must hold local->sta_bss_lock */
2194 static void __ieee80211_rx_bss_hash_add(struct net_device *dev,
2195 struct ieee80211_sta_bss *bss)
2196 {
2197 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2198 u8 hash_idx;
2199
2200 if (bss_mesh_cfg(bss))
2201 hash_idx = mesh_id_hash(bss_mesh_id(bss),
2202 bss_mesh_id_len(bss));
2203 else
2204 hash_idx = STA_HASH(bss->bssid);
2205
2206 bss->hnext = local->sta_bss_hash[hash_idx];
2207 local->sta_bss_hash[hash_idx] = bss;
2208 }
2209
2210
2211 /* Caller must hold local->sta_bss_lock */
2212 static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
2213 struct ieee80211_sta_bss *bss)
2214 {
2215 struct ieee80211_sta_bss *b, *prev = NULL;
2216 b = local->sta_bss_hash[STA_HASH(bss->bssid)];
2217 while (b) {
2218 if (b == bss) {
2219 if (!prev)
2220 local->sta_bss_hash[STA_HASH(bss->bssid)] =
2221 bss->hnext;
2222 else
2223 prev->hnext = bss->hnext;
2224 break;
2225 }
2226 prev = b;
2227 b = b->hnext;
2228 }
2229 }
2230
2231
2232 static struct ieee80211_sta_bss *
2233 ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int freq,
2234 u8 *ssid, u8 ssid_len)
2235 {
2236 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2237 struct ieee80211_sta_bss *bss;
2238
2239 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2240 if (!bss)
2241 return NULL;
2242 atomic_inc(&bss->users);
2243 atomic_inc(&bss->users);
2244 memcpy(bss->bssid, bssid, ETH_ALEN);
2245 bss->freq = freq;
2246 if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
2247 memcpy(bss->ssid, ssid, ssid_len);
2248 bss->ssid_len = ssid_len;
2249 }
2250
2251 spin_lock_bh(&local->sta_bss_lock);
2252 /* TODO: order by RSSI? */
2253 list_add_tail(&bss->list, &local->sta_bss_list);
2254 __ieee80211_rx_bss_hash_add(dev, bss);
2255 spin_unlock_bh(&local->sta_bss_lock);
2256 return bss;
2257 }
2258
2259 static struct ieee80211_sta_bss *
2260 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int freq,
2261 u8 *ssid, u8 ssid_len)
2262 {
2263 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2264 struct ieee80211_sta_bss *bss;
2265
2266 spin_lock_bh(&local->sta_bss_lock);
2267 bss = local->sta_bss_hash[STA_HASH(bssid)];
2268 while (bss) {
2269 if (!bss_mesh_cfg(bss) &&
2270 !memcmp(bss->bssid, bssid, ETH_ALEN) &&
2271 bss->freq == freq &&
2272 bss->ssid_len == ssid_len &&
2273 (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
2274 atomic_inc(&bss->users);
2275 break;
2276 }
2277 bss = bss->hnext;
2278 }
2279 spin_unlock_bh(&local->sta_bss_lock);
2280 return bss;
2281 }
2282
2283 #ifdef CONFIG_MAC80211_MESH
2284 static struct ieee80211_sta_bss *
2285 ieee80211_rx_mesh_bss_get(struct net_device *dev, u8 *mesh_id, int mesh_id_len,
2286 u8 *mesh_cfg, int freq)
2287 {
2288 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2289 struct ieee80211_sta_bss *bss;
2290
2291 spin_lock_bh(&local->sta_bss_lock);
2292 bss = local->sta_bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
2293 while (bss) {
2294 if (bss_mesh_cfg(bss) &&
2295 !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
2296 bss->freq == freq &&
2297 mesh_id_len == bss->mesh_id_len &&
2298 (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
2299 mesh_id_len))) {
2300 atomic_inc(&bss->users);
2301 break;
2302 }
2303 bss = bss->hnext;
2304 }
2305 spin_unlock_bh(&local->sta_bss_lock);
2306 return bss;
2307 }
2308
2309 static struct ieee80211_sta_bss *
2310 ieee80211_rx_mesh_bss_add(struct net_device *dev, u8 *mesh_id, int mesh_id_len,
2311 u8 *mesh_cfg, int mesh_config_len, int freq)
2312 {
2313 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2314 struct ieee80211_sta_bss *bss;
2315
2316 if (mesh_config_len != MESH_CFG_LEN)
2317 return NULL;
2318
2319 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2320 if (!bss)
2321 return NULL;
2322
2323 bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
2324 if (!bss->mesh_cfg) {
2325 kfree(bss);
2326 return NULL;
2327 }
2328
2329 if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
2330 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
2331 if (!bss->mesh_id) {
2332 kfree(bss->mesh_cfg);
2333 kfree(bss);
2334 return NULL;
2335 }
2336 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
2337 }
2338
2339 atomic_inc(&bss->users);
2340 atomic_inc(&bss->users);
2341 memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
2342 bss->mesh_id_len = mesh_id_len;
2343 bss->freq = freq;
2344 spin_lock_bh(&local->sta_bss_lock);
2345 /* TODO: order by RSSI? */
2346 list_add_tail(&bss->list, &local->sta_bss_list);
2347 __ieee80211_rx_bss_hash_add(dev, bss);
2348 spin_unlock_bh(&local->sta_bss_lock);
2349 return bss;
2350 }
2351 #endif
2352
2353 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
2354 {
2355 kfree(bss->wpa_ie);
2356 kfree(bss->rsn_ie);
2357 kfree(bss->wmm_ie);
2358 kfree(bss->ht_ie);
2359 kfree(bss->ht_add_ie);
2360 kfree(bss_mesh_id(bss));
2361 kfree(bss_mesh_cfg(bss));
2362 kfree(bss);
2363 }
2364
2365
2366 static void ieee80211_rx_bss_put(struct ieee80211_local *local,
2367 struct ieee80211_sta_bss *bss)
2368 {
2369 local_bh_disable();
2370 if (!atomic_dec_and_lock(&bss->users, &local->sta_bss_lock)) {
2371 local_bh_enable();
2372 return;
2373 }
2374
2375 __ieee80211_rx_bss_hash_del(local, bss);
2376 list_del(&bss->list);
2377 spin_unlock_bh(&local->sta_bss_lock);
2378 ieee80211_rx_bss_free(bss);
2379 }
2380
2381
2382 void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
2383 {
2384 spin_lock_init(&local->sta_bss_lock);
2385 INIT_LIST_HEAD(&local->sta_bss_list);
2386 }
2387
2388
2389 void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
2390 {
2391 struct ieee80211_sta_bss *bss, *tmp;
2392
2393 list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
2394 ieee80211_rx_bss_put(local, bss);
2395 }
2396
2397
2398 static int ieee80211_sta_join_ibss(struct net_device *dev,
2399 struct ieee80211_if_sta *ifsta,
2400 struct ieee80211_sta_bss *bss)
2401 {
2402 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2403 int res, rates, i, j;
2404 struct sk_buff *skb;
2405 struct ieee80211_mgmt *mgmt;
2406 u8 *pos;
2407 struct ieee80211_sub_if_data *sdata;
2408 struct ieee80211_supported_band *sband;
2409 union iwreq_data wrqu;
2410
2411 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2412
2413 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2414
2415 /* Remove possible STA entries from other IBSS networks. */
2416 sta_info_flush_delayed(sdata);
2417
2418 if (local->ops->reset_tsf) {
2419 /* Reset own TSF to allow time synchronization work. */
2420 local->ops->reset_tsf(local_to_hw(local));
2421 }
2422 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2423 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2424 if (res)
2425 return res;
2426
2427 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2428
2429 sdata->drop_unencrypted = bss->capability &
2430 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2431
2432 res = ieee80211_set_freq(dev, bss->freq);
2433
2434 if (res)
2435 return res;
2436
2437 /* Build IBSS probe response */
2438 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2439 if (skb) {
2440 skb_reserve(skb, local->hw.extra_tx_headroom);
2441
2442 mgmt = (struct ieee80211_mgmt *)
2443 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2444 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2445 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2446 IEEE80211_STYPE_PROBE_RESP);
2447 memset(mgmt->da, 0xff, ETH_ALEN);
2448 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
2449 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2450 mgmt->u.beacon.beacon_int =
2451 cpu_to_le16(local->hw.conf.beacon_int);
2452 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
2453 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2454
2455 pos = skb_put(skb, 2 + ifsta->ssid_len);
2456 *pos++ = WLAN_EID_SSID;
2457 *pos++ = ifsta->ssid_len;
2458 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2459
2460 rates = bss->supp_rates_len;
2461 if (rates > 8)
2462 rates = 8;
2463 pos = skb_put(skb, 2 + rates);
2464 *pos++ = WLAN_EID_SUPP_RATES;
2465 *pos++ = rates;
2466 memcpy(pos, bss->supp_rates, rates);
2467
2468 if (bss->band == IEEE80211_BAND_2GHZ) {
2469 pos = skb_put(skb, 2 + 1);
2470 *pos++ = WLAN_EID_DS_PARAMS;
2471 *pos++ = 1;
2472 *pos++ = ieee80211_frequency_to_channel(bss->freq);
2473 }
2474
2475 pos = skb_put(skb, 2 + 2);
2476 *pos++ = WLAN_EID_IBSS_PARAMS;
2477 *pos++ = 2;
2478 /* FIX: set ATIM window based on scan results */
2479 *pos++ = 0;
2480 *pos++ = 0;
2481
2482 if (bss->supp_rates_len > 8) {
2483 rates = bss->supp_rates_len - 8;
2484 pos = skb_put(skb, 2 + rates);
2485 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2486 *pos++ = rates;
2487 memcpy(pos, &bss->supp_rates[8], rates);
2488 }
2489
2490 ifsta->probe_resp = skb;
2491
2492 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
2493 }
2494
2495 rates = 0;
2496 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2497 for (i = 0; i < bss->supp_rates_len; i++) {
2498 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2499 for (j = 0; j < sband->n_bitrates; j++)
2500 if (sband->bitrates[j].bitrate == bitrate)
2501 rates |= BIT(j);
2502 }
2503 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
2504
2505 ieee80211_sta_def_wmm_params(dev, bss, 1);
2506
2507 ifsta->state = IEEE80211_IBSS_JOINED;
2508 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2509
2510 memset(&wrqu, 0, sizeof(wrqu));
2511 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2512 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
2513
2514 return res;
2515 }
2516
2517 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
2518 struct ieee802_11_elems *elems,
2519 enum ieee80211_band band)
2520 {
2521 struct ieee80211_supported_band *sband;
2522 struct ieee80211_rate *bitrates;
2523 size_t num_rates;
2524 u64 supp_rates;
2525 int i, j;
2526 sband = local->hw.wiphy->bands[band];
2527
2528 if (!sband) {
2529 WARN_ON(1);
2530 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2531 }
2532
2533 bitrates = sband->bitrates;
2534 num_rates = sband->n_bitrates;
2535 supp_rates = 0;
2536 for (i = 0; i < elems->supp_rates_len +
2537 elems->ext_supp_rates_len; i++) {
2538 u8 rate = 0;
2539 int own_rate;
2540 if (i < elems->supp_rates_len)
2541 rate = elems->supp_rates[i];
2542 else if (elems->ext_supp_rates)
2543 rate = elems->ext_supp_rates
2544 [i - elems->supp_rates_len];
2545 own_rate = 5 * (rate & 0x7f);
2546 for (j = 0; j < num_rates; j++)
2547 if (bitrates[j].bitrate == own_rate)
2548 supp_rates |= BIT(j);
2549 }
2550 return supp_rates;
2551 }
2552
2553
2554 static void ieee80211_rx_bss_info(struct net_device *dev,
2555 struct ieee80211_mgmt *mgmt,
2556 size_t len,
2557 struct ieee80211_rx_status *rx_status,
2558 struct ieee802_11_elems *elems,
2559 int beacon)
2560 {
2561 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2562 int freq, clen;
2563 struct ieee80211_sta_bss *bss;
2564 struct sta_info *sta;
2565 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2566 u64 beacon_timestamp, rx_timestamp;
2567 struct ieee80211_channel *channel;
2568 DECLARE_MAC_BUF(mac);
2569 DECLARE_MAC_BUF(mac2);
2570
2571 if (!beacon && memcmp(mgmt->da, dev->dev_addr, ETH_ALEN))
2572 return; /* ignore ProbeResp to foreign address */
2573
2574 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
2575
2576 if (ieee80211_vif_is_mesh(&sdata->vif) && elems->mesh_id &&
2577 elems->mesh_config && mesh_matches_local(elems, dev)) {
2578 u64 rates = ieee80211_sta_get_rates(local, elems,
2579 rx_status->band);
2580
2581 mesh_neighbour_update(mgmt->sa, rates, dev,
2582 mesh_peer_accepts_plinks(elems, dev));
2583 }
2584
2585 rcu_read_lock();
2586
2587 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && elems->supp_rates &&
2588 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0 &&
2589 (sta = sta_info_get(local, mgmt->sa))) {
2590 u64 prev_rates;
2591 u64 supp_rates = ieee80211_sta_get_rates(local, elems,
2592 rx_status->band);
2593
2594 prev_rates = sta->supp_rates[rx_status->band];
2595 sta->supp_rates[rx_status->band] &= supp_rates;
2596 if (sta->supp_rates[rx_status->band] == 0) {
2597 /* No matching rates - this should not really happen.
2598 * Make sure that at least one rate is marked
2599 * supported to avoid issues with TX rate ctrl. */
2600 sta->supp_rates[rx_status->band] =
2601 sdata->u.sta.supp_rates_bits[rx_status->band];
2602 }
2603 }
2604
2605 rcu_read_unlock();
2606
2607 if (elems->ds_params && elems->ds_params_len == 1)
2608 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
2609 else
2610 freq = rx_status->freq;
2611
2612 channel = ieee80211_get_channel(local->hw.wiphy, freq);
2613
2614 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2615 return;
2616
2617 #ifdef CONFIG_MAC80211_MESH
2618 if (elems->mesh_config)
2619 bss = ieee80211_rx_mesh_bss_get(dev, elems->mesh_id,
2620 elems->mesh_id_len, elems->mesh_config, freq);
2621 else
2622 #endif
2623 bss = ieee80211_rx_bss_get(dev, mgmt->bssid, freq,
2624 elems->ssid, elems->ssid_len);
2625 if (!bss) {
2626 #ifdef CONFIG_MAC80211_MESH
2627 if (elems->mesh_config)
2628 bss = ieee80211_rx_mesh_bss_add(dev, elems->mesh_id,
2629 elems->mesh_id_len, elems->mesh_config,
2630 elems->mesh_config_len, freq);
2631 else
2632 #endif
2633 bss = ieee80211_rx_bss_add(dev, mgmt->bssid, freq,
2634 elems->ssid, elems->ssid_len);
2635 if (!bss)
2636 return;
2637 } else {
2638 #if 0
2639 /* TODO: order by RSSI? */
2640 spin_lock_bh(&local->sta_bss_lock);
2641 list_move_tail(&bss->list, &local->sta_bss_list);
2642 spin_unlock_bh(&local->sta_bss_lock);
2643 #endif
2644 }
2645
2646 /* save the ERP value so that it is available at association time */
2647 if (elems->erp_info && elems->erp_info_len >= 1) {
2648 bss->erp_value = elems->erp_info[0];
2649 bss->has_erp_value = 1;
2650 }
2651
2652 if (elems->ht_cap_elem &&
2653 (!bss->ht_ie || bss->ht_ie_len != elems->ht_cap_elem_len ||
2654 memcmp(bss->ht_ie, elems->ht_cap_elem, elems->ht_cap_elem_len))) {
2655 kfree(bss->ht_ie);
2656 bss->ht_ie = kmalloc(elems->ht_cap_elem_len + 2, GFP_ATOMIC);
2657 if (bss->ht_ie) {
2658 memcpy(bss->ht_ie, elems->ht_cap_elem - 2,
2659 elems->ht_cap_elem_len + 2);
2660 bss->ht_ie_len = elems->ht_cap_elem_len + 2;
2661 } else
2662 bss->ht_ie_len = 0;
2663 } else if (!elems->ht_cap_elem && bss->ht_ie) {
2664 kfree(bss->ht_ie);
2665 bss->ht_ie = NULL;
2666 bss->ht_ie_len = 0;
2667 }
2668
2669 if (elems->ht_info_elem &&
2670 (!bss->ht_add_ie ||
2671 bss->ht_add_ie_len != elems->ht_info_elem_len ||
2672 memcmp(bss->ht_add_ie, elems->ht_info_elem,
2673 elems->ht_info_elem_len))) {
2674 kfree(bss->ht_add_ie);
2675 bss->ht_add_ie =
2676 kmalloc(elems->ht_info_elem_len + 2, GFP_ATOMIC);
2677 if (bss->ht_add_ie) {
2678 memcpy(bss->ht_add_ie, elems->ht_info_elem - 2,
2679 elems->ht_info_elem_len + 2);
2680 bss->ht_add_ie_len = elems->ht_info_elem_len + 2;
2681 } else
2682 bss->ht_add_ie_len = 0;
2683 } else if (!elems->ht_info_elem && bss->ht_add_ie) {
2684 kfree(bss->ht_add_ie);
2685 bss->ht_add_ie = NULL;
2686 bss->ht_add_ie_len = 0;
2687 }
2688
2689 bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
2690 bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
2691
2692 if (elems->tim) {
2693 struct ieee80211_tim_ie *tim_ie =
2694 (struct ieee80211_tim_ie *)elems->tim;
2695 bss->dtim_period = tim_ie->dtim_period;
2696 }
2697
2698 /* set default value for buggy APs */
2699 if (!elems->tim || bss->dtim_period == 0)
2700 bss->dtim_period = 1;
2701
2702 bss->supp_rates_len = 0;
2703 if (elems->supp_rates) {
2704 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2705 if (clen > elems->supp_rates_len)
2706 clen = elems->supp_rates_len;
2707 memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates,
2708 clen);
2709 bss->supp_rates_len += clen;
2710 }
2711 if (elems->ext_supp_rates) {
2712 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2713 if (clen > elems->ext_supp_rates_len)
2714 clen = elems->ext_supp_rates_len;
2715 memcpy(&bss->supp_rates[bss->supp_rates_len],
2716 elems->ext_supp_rates, clen);
2717 bss->supp_rates_len += clen;
2718 }
2719
2720 bss->band = rx_status->band;
2721
2722 bss->timestamp = beacon_timestamp;
2723 bss->last_update = jiffies;
2724 bss->signal = rx_status->signal;
2725 bss->noise = rx_status->noise;
2726 bss->qual = rx_status->qual;
2727 if (!beacon && !bss->probe_resp)
2728 bss->probe_resp = true;
2729
2730 /*
2731 * In STA mode, the remaining parameters should not be overridden
2732 * by beacons because they're not necessarily accurate there.
2733 */
2734 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
2735 bss->probe_resp && beacon) {
2736 ieee80211_rx_bss_put(local, bss);
2737 return;
2738 }
2739
2740 if (elems->wpa &&
2741 (!bss->wpa_ie || bss->wpa_ie_len != elems->wpa_len ||
2742 memcmp(bss->wpa_ie, elems->wpa, elems->wpa_len))) {
2743 kfree(bss->wpa_ie);
2744 bss->wpa_ie = kmalloc(elems->wpa_len + 2, GFP_ATOMIC);
2745 if (bss->wpa_ie) {
2746 memcpy(bss->wpa_ie, elems->wpa - 2, elems->wpa_len + 2);
2747 bss->wpa_ie_len = elems->wpa_len + 2;
2748 } else
2749 bss->wpa_ie_len = 0;
2750 } else if (!elems->wpa && bss->wpa_ie) {
2751 kfree(bss->wpa_ie);
2752 bss->wpa_ie = NULL;
2753 bss->wpa_ie_len = 0;
2754 }
2755
2756 if (elems->rsn &&
2757 (!bss->rsn_ie || bss->rsn_ie_len != elems->rsn_len ||
2758 memcmp(bss->rsn_ie, elems->rsn, elems->rsn_len))) {
2759 kfree(bss->rsn_ie);
2760 bss->rsn_ie = kmalloc(elems->rsn_len + 2, GFP_ATOMIC);
2761 if (bss->rsn_ie) {
2762 memcpy(bss->rsn_ie, elems->rsn - 2, elems->rsn_len + 2);
2763 bss->rsn_ie_len = elems->rsn_len + 2;
2764 } else
2765 bss->rsn_ie_len = 0;
2766 } else if (!elems->rsn && bss->rsn_ie) {
2767 kfree(bss->rsn_ie);
2768 bss->rsn_ie = NULL;
2769 bss->rsn_ie_len = 0;
2770 }
2771
2772 /*
2773 * Cf.
2774 * http://www.wipo.int/pctdb/en/wo.jsp?wo=2007047181&IA=WO2007047181&DISPLAY=DESC
2775 *
2776 * quoting:
2777 *
2778 * In particular, "Wi-Fi CERTIFIED for WMM - Support for Multimedia
2779 * Applications with Quality of Service in Wi-Fi Networks," Wi- Fi
2780 * Alliance (September 1, 2004) is incorporated by reference herein.
2781 * The inclusion of the WMM Parameters in probe responses and
2782 * association responses is mandatory for WMM enabled networks. The
2783 * inclusion of the WMM Parameters in beacons, however, is optional.
2784 */
2785
2786 if (elems->wmm_param &&
2787 (!bss->wmm_ie || bss->wmm_ie_len != elems->wmm_param_len ||
2788 memcmp(bss->wmm_ie, elems->wmm_param, elems->wmm_param_len))) {
2789 kfree(bss->wmm_ie);
2790 bss->wmm_ie = kmalloc(elems->wmm_param_len + 2, GFP_ATOMIC);
2791 if (bss->wmm_ie) {
2792 memcpy(bss->wmm_ie, elems->wmm_param - 2,
2793 elems->wmm_param_len + 2);
2794 bss->wmm_ie_len = elems->wmm_param_len + 2;
2795 } else
2796 bss->wmm_ie_len = 0;
2797 } else if (elems->wmm_info &&
2798 (!bss->wmm_ie || bss->wmm_ie_len != elems->wmm_info_len ||
2799 memcmp(bss->wmm_ie, elems->wmm_info,
2800 elems->wmm_info_len))) {
2801 /* As for certain AP's Fifth bit is not set in WMM IE in
2802 * beacon frames.So while parsing the beacon frame the
2803 * wmm_info structure is used instead of wmm_param.
2804 * wmm_info structure was never used to set bss->wmm_ie.
2805 * This code fixes this problem by copying the WME
2806 * information from wmm_info to bss->wmm_ie and enabling
2807 * n-band association.
2808 */
2809 kfree(bss->wmm_ie);
2810 bss->wmm_ie = kmalloc(elems->wmm_info_len + 2, GFP_ATOMIC);
2811 if (bss->wmm_ie) {
2812 memcpy(bss->wmm_ie, elems->wmm_info - 2,
2813 elems->wmm_info_len + 2);
2814 bss->wmm_ie_len = elems->wmm_info_len + 2;
2815 } else
2816 bss->wmm_ie_len = 0;
2817 } else if (!elems->wmm_param && !elems->wmm_info && bss->wmm_ie) {
2818 kfree(bss->wmm_ie);
2819 bss->wmm_ie = NULL;
2820 bss->wmm_ie_len = 0;
2821 }
2822
2823 /* check if we need to merge IBSS */
2824 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
2825 !local->sta_sw_scanning && !local->sta_hw_scanning &&
2826 bss->capability & WLAN_CAPABILITY_IBSS &&
2827 bss->freq == local->oper_channel->center_freq &&
2828 elems->ssid_len == sdata->u.sta.ssid_len &&
2829 memcmp(elems->ssid, sdata->u.sta.ssid,
2830 sdata->u.sta.ssid_len) == 0) {
2831 if (rx_status->flag & RX_FLAG_TSFT) {
2832 /* in order for correct IBSS merging we need mactime
2833 *
2834 * since mactime is defined as the time the first data
2835 * symbol of the frame hits the PHY, and the timestamp
2836 * of the beacon is defined as "the time that the data
2837 * symbol containing the first bit of the timestamp is
2838 * transmitted to the PHY plus the transmitting STA’s
2839 * delays through its local PHY from the MAC-PHY
2840 * interface to its interface with the WM"
2841 * (802.11 11.1.2) - equals the time this bit arrives at
2842 * the receiver - we have to take into account the
2843 * offset between the two.
2844 * e.g: at 1 MBit that means mactime is 192 usec earlier
2845 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
2846 */
2847 int rate = local->hw.wiphy->bands[rx_status->band]->
2848 bitrates[rx_status->rate_idx].bitrate;
2849 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
2850 } else if (local && local->ops && local->ops->get_tsf)
2851 /* second best option: get current TSF */
2852 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
2853 else
2854 /* can't merge without knowing the TSF */
2855 rx_timestamp = -1LLU;
2856 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2857 printk(KERN_DEBUG "RX beacon SA=%s BSSID="
2858 "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
2859 print_mac(mac, mgmt->sa),
2860 print_mac(mac2, mgmt->bssid),
2861 (unsigned long long)rx_timestamp,
2862 (unsigned long long)beacon_timestamp,
2863 (unsigned long long)(rx_timestamp - beacon_timestamp),
2864 jiffies);
2865 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2866 if (beacon_timestamp > rx_timestamp) {
2867 #ifndef CONFIG_MAC80211_IBSS_DEBUG
2868 printk(KERN_DEBUG "%s: beacon TSF higher than "
2869 "local TSF - IBSS merge with BSSID %s\n",
2870 dev->name, print_mac(mac, mgmt->bssid));
2871 #endif
2872 ieee80211_sta_join_ibss(dev, &sdata->u.sta, bss);
2873 ieee80211_ibss_add_sta(dev, NULL,
2874 mgmt->bssid, mgmt->sa,
2875 BIT(rx_status->rate_idx));
2876 }
2877 }
2878
2879 ieee80211_rx_bss_put(local, bss);
2880 }
2881
2882
2883 static void ieee80211_rx_mgmt_probe_resp(struct net_device *dev,
2884 struct ieee80211_mgmt *mgmt,
2885 size_t len,
2886 struct ieee80211_rx_status *rx_status)
2887 {
2888 size_t baselen;
2889 struct ieee802_11_elems elems;
2890
2891 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2892 if (baselen > len)
2893 return;
2894
2895 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2896 &elems);
2897
2898 ieee80211_rx_bss_info(dev, mgmt, len, rx_status, &elems, 0);
2899 }
2900
2901
2902 static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
2903 struct ieee80211_mgmt *mgmt,
2904 size_t len,
2905 struct ieee80211_rx_status *rx_status)
2906 {
2907 struct ieee80211_sub_if_data *sdata;
2908 struct ieee80211_if_sta *ifsta;
2909 size_t baselen;
2910 struct ieee802_11_elems elems;
2911 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2912 struct ieee80211_conf *conf = &local->hw.conf;
2913 u32 changed = 0;
2914
2915 /* Process beacon from the current BSS */
2916 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2917 if (baselen > len)
2918 return;
2919
2920 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
2921
2922 ieee80211_rx_bss_info(dev, mgmt, len, rx_status, &elems, 1);
2923
2924 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2925 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2926 return;
2927 ifsta = &sdata->u.sta;
2928
2929 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
2930 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
2931 return;
2932
2933 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
2934 elems.wmm_param_len);
2935
2936 /* Do not send changes to driver if we are scanning. This removes
2937 * requirement that driver's bss_info_changed function needs to be
2938 * atomic. */
2939 if (local->sta_sw_scanning || local->sta_hw_scanning)
2940 return;
2941
2942 if (elems.erp_info && elems.erp_info_len >= 1)
2943 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
2944 else {
2945 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
2946 changed |= ieee80211_handle_protect_preamb(sdata, false,
2947 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
2948 }
2949
2950 if (elems.ht_cap_elem && elems.ht_info_elem &&
2951 elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
2952 struct ieee80211_ht_bss_info bss_info;
2953
2954 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2955 (struct ieee80211_ht_addt_info *)
2956 elems.ht_info_elem, &bss_info);
2957 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
2958 &bss_info);
2959 }
2960
2961 ieee80211_bss_info_change_notify(sdata, changed);
2962 }
2963
2964
2965 static void ieee80211_rx_mgmt_probe_req(struct net_device *dev,
2966 struct ieee80211_if_sta *ifsta,
2967 struct ieee80211_mgmt *mgmt,
2968 size_t len,
2969 struct ieee80211_rx_status *rx_status)
2970 {
2971 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2972 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2973 int tx_last_beacon;
2974 struct sk_buff *skb;
2975 struct ieee80211_mgmt *resp;
2976 u8 *pos, *end;
2977 DECLARE_MAC_BUF(mac);
2978 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2979 DECLARE_MAC_BUF(mac2);
2980 DECLARE_MAC_BUF(mac3);
2981 #endif
2982
2983 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS ||
2984 ifsta->state != IEEE80211_IBSS_JOINED ||
2985 len < 24 + 2 || !ifsta->probe_resp)
2986 return;
2987
2988 if (local->ops->tx_last_beacon)
2989 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2990 else
2991 tx_last_beacon = 1;
2992
2993 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2994 printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
2995 "%s (tx_last_beacon=%d)\n",
2996 dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
2997 print_mac(mac3, mgmt->bssid), tx_last_beacon);
2998 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2999
3000 if (!tx_last_beacon)
3001 return;
3002
3003 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
3004 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
3005 return;
3006
3007 end = ((u8 *) mgmt) + len;
3008 pos = mgmt->u.probe_req.variable;
3009 if (pos[0] != WLAN_EID_SSID ||
3010 pos + 2 + pos[1] > end) {
3011 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3012 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
3013 "from %s\n",
3014 dev->name, print_mac(mac, mgmt->sa));
3015 #endif
3016 return;
3017 }
3018 if (pos[1] != 0 &&
3019 (pos[1] != ifsta->ssid_len ||
3020 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
3021 /* Ignore ProbeReq for foreign SSID */
3022 return;
3023 }
3024
3025 /* Reply with ProbeResp */
3026 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
3027 if (!skb)
3028 return;
3029
3030 resp = (struct ieee80211_mgmt *) skb->data;
3031 memcpy(resp->da, mgmt->sa, ETH_ALEN);
3032 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3033 printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
3034 dev->name, print_mac(mac, resp->da));
3035 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3036 ieee80211_sta_tx(dev, skb, 0);
3037 }
3038
3039 static void ieee80211_rx_mgmt_action(struct net_device *dev,
3040 struct ieee80211_if_sta *ifsta,
3041 struct ieee80211_mgmt *mgmt,
3042 size_t len,
3043 struct ieee80211_rx_status *rx_status)
3044 {
3045 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3046 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3047
3048 if (len < IEEE80211_MIN_ACTION_SIZE)
3049 return;
3050
3051 switch (mgmt->u.action.category) {
3052 case WLAN_CATEGORY_SPECTRUM_MGMT:
3053 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
3054 break;
3055 switch (mgmt->u.action.u.chan_switch.action_code) {
3056 case WLAN_ACTION_SPCT_MSR_REQ:
3057 if (len < (IEEE80211_MIN_ACTION_SIZE +
3058 sizeof(mgmt->u.action.u.measurement)))
3059 break;
3060 ieee80211_sta_process_measurement_req(dev, mgmt, len);
3061 break;
3062 }
3063 break;
3064 case WLAN_CATEGORY_BACK:
3065 switch (mgmt->u.action.u.addba_req.action_code) {
3066 case WLAN_ACTION_ADDBA_REQ:
3067 if (len < (IEEE80211_MIN_ACTION_SIZE +
3068 sizeof(mgmt->u.action.u.addba_req)))
3069 break;
3070 ieee80211_sta_process_addba_request(dev, mgmt, len);
3071 break;
3072 case WLAN_ACTION_ADDBA_RESP:
3073 if (len < (IEEE80211_MIN_ACTION_SIZE +
3074 sizeof(mgmt->u.action.u.addba_resp)))
3075 break;
3076 ieee80211_sta_process_addba_resp(dev, mgmt, len);
3077 break;
3078 case WLAN_ACTION_DELBA:
3079 if (len < (IEEE80211_MIN_ACTION_SIZE +
3080 sizeof(mgmt->u.action.u.delba)))
3081 break;
3082 ieee80211_sta_process_delba(dev, mgmt, len);
3083 break;
3084 }
3085 break;
3086 case PLINK_CATEGORY:
3087 if (ieee80211_vif_is_mesh(&sdata->vif))
3088 mesh_rx_plink_frame(dev, mgmt, len, rx_status);
3089 break;
3090 case MESH_PATH_SEL_CATEGORY:
3091 if (ieee80211_vif_is_mesh(&sdata->vif))
3092 mesh_rx_path_sel_frame(dev, mgmt, len);
3093 break;
3094 }
3095 }
3096
3097 void ieee80211_sta_rx_mgmt(struct net_device *dev, struct sk_buff *skb,
3098 struct ieee80211_rx_status *rx_status)
3099 {
3100 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3101 struct ieee80211_sub_if_data *sdata;
3102 struct ieee80211_if_sta *ifsta;
3103 struct ieee80211_mgmt *mgmt;
3104 u16 fc;
3105
3106 if (skb->len < 24)
3107 goto fail;
3108
3109 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3110 ifsta = &sdata->u.sta;
3111
3112 mgmt = (struct ieee80211_mgmt *) skb->data;
3113 fc = le16_to_cpu(mgmt->frame_control);
3114
3115 switch (fc & IEEE80211_FCTL_STYPE) {
3116 case IEEE80211_STYPE_PROBE_REQ:
3117 case IEEE80211_STYPE_PROBE_RESP:
3118 case IEEE80211_STYPE_BEACON:
3119 case IEEE80211_STYPE_ACTION:
3120 memcpy(skb->cb, rx_status, sizeof(*rx_status));
3121 case IEEE80211_STYPE_AUTH:
3122 case IEEE80211_STYPE_ASSOC_RESP:
3123 case IEEE80211_STYPE_REASSOC_RESP:
3124 case IEEE80211_STYPE_DEAUTH:
3125 case IEEE80211_STYPE_DISASSOC:
3126 skb_queue_tail(&ifsta->skb_queue, skb);
3127 queue_work(local->hw.workqueue, &ifsta->work);
3128 return;
3129 }
3130
3131 fail:
3132 kfree_skb(skb);
3133 }
3134
3135
3136 static void ieee80211_sta_rx_queued_mgmt(struct net_device *dev,
3137 struct sk_buff *skb)
3138 {
3139 struct ieee80211_rx_status *rx_status;
3140 struct ieee80211_sub_if_data *sdata;
3141 struct ieee80211_if_sta *ifsta;
3142 struct ieee80211_mgmt *mgmt;
3143 u16 fc;
3144
3145 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3146 ifsta = &sdata->u.sta;
3147
3148 rx_status = (struct ieee80211_rx_status *) skb->cb;
3149 mgmt = (struct ieee80211_mgmt *) skb->data;
3150 fc = le16_to_cpu(mgmt->frame_control);
3151
3152 switch (fc & IEEE80211_FCTL_STYPE) {
3153 case IEEE80211_STYPE_PROBE_REQ:
3154 ieee80211_rx_mgmt_probe_req(dev, ifsta, mgmt, skb->len,
3155 rx_status);
3156 break;
3157 case IEEE80211_STYPE_PROBE_RESP:
3158 ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
3159 break;
3160 case IEEE80211_STYPE_BEACON:
3161 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
3162 break;
3163 case IEEE80211_STYPE_AUTH:
3164 ieee80211_rx_mgmt_auth(dev, ifsta, mgmt, skb->len);
3165 break;
3166 case IEEE80211_STYPE_ASSOC_RESP:
3167 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
3168 break;
3169 case IEEE80211_STYPE_REASSOC_RESP:
3170 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
3171 break;
3172 case IEEE80211_STYPE_DEAUTH:
3173 ieee80211_rx_mgmt_deauth(dev, ifsta, mgmt, skb->len);
3174 break;
3175 case IEEE80211_STYPE_DISASSOC:
3176 ieee80211_rx_mgmt_disassoc(dev, ifsta, mgmt, skb->len);
3177 break;
3178 case IEEE80211_STYPE_ACTION:
3179 ieee80211_rx_mgmt_action(dev, ifsta, mgmt, skb->len, rx_status);
3180 break;
3181 }
3182
3183 kfree_skb(skb);
3184 }
3185
3186
3187 ieee80211_rx_result
3188 ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
3189 struct ieee80211_rx_status *rx_status)
3190 {
3191 struct ieee80211_mgmt *mgmt;
3192 __le16 fc;
3193
3194 if (skb->len < 2)
3195 return RX_DROP_UNUSABLE;
3196
3197 mgmt = (struct ieee80211_mgmt *) skb->data;
3198 fc = mgmt->frame_control;
3199
3200 if (ieee80211_is_ctl(fc))
3201 return RX_CONTINUE;
3202
3203 if (skb->len < 24)
3204 return RX_DROP_MONITOR;
3205
3206 if (ieee80211_is_probe_resp(fc)) {
3207 ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
3208 dev_kfree_skb(skb);
3209 return RX_QUEUED;
3210 }
3211
3212 if (ieee80211_is_beacon(fc)) {
3213 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
3214 dev_kfree_skb(skb);
3215 return RX_QUEUED;
3216 }
3217
3218 return RX_CONTINUE;
3219 }
3220
3221
3222 static int ieee80211_sta_active_ibss(struct net_device *dev)
3223 {
3224 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3225 int active = 0;
3226 struct sta_info *sta;
3227 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3228
3229 rcu_read_lock();
3230
3231 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3232 if (sta->sdata == sdata &&
3233 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
3234 jiffies)) {
3235 active++;
3236 break;
3237 }
3238 }
3239
3240 rcu_read_unlock();
3241
3242 return active;
3243 }
3244
3245
3246 static void ieee80211_sta_expire(struct net_device *dev, unsigned long exp_time)
3247 {
3248 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3249 struct sta_info *sta, *tmp;
3250 LIST_HEAD(tmp_list);
3251 DECLARE_MAC_BUF(mac);
3252 unsigned long flags;
3253
3254 spin_lock_irqsave(&local->sta_lock, flags);
3255 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
3256 if (time_after(jiffies, sta->last_rx + exp_time)) {
3257 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3258 printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
3259 dev->name, print_mac(mac, sta->addr));
3260 #endif
3261 __sta_info_unlink(&sta);
3262 if (sta)
3263 list_add(&sta->list, &tmp_list);
3264 }
3265 spin_unlock_irqrestore(&local->sta_lock, flags);
3266
3267 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
3268 sta_info_destroy(sta);
3269 }
3270
3271
3272 static void ieee80211_sta_merge_ibss(struct net_device *dev,
3273 struct ieee80211_if_sta *ifsta)
3274 {
3275 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
3276
3277 ieee80211_sta_expire(dev, IEEE80211_IBSS_INACTIVITY_LIMIT);
3278 if (ieee80211_sta_active_ibss(dev))
3279 return;
3280
3281 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
3282 "IBSS networks with same SSID (merge)\n", dev->name);
3283 ieee80211_sta_req_scan(dev, ifsta->ssid, ifsta->ssid_len);
3284 }
3285
3286
3287 #ifdef CONFIG_MAC80211_MESH
3288 static void ieee80211_mesh_housekeeping(struct net_device *dev,
3289 struct ieee80211_if_sta *ifsta)
3290 {
3291 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3292 bool free_plinks;
3293
3294 ieee80211_sta_expire(dev, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
3295 mesh_path_expire(dev);
3296
3297 free_plinks = mesh_plink_availables(sdata);
3298 if (free_plinks != sdata->u.sta.accepting_plinks)
3299 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3300
3301 mod_timer(&ifsta->timer, jiffies +
3302 IEEE80211_MESH_HOUSEKEEPING_INTERVAL);
3303 }
3304
3305
3306 void ieee80211_start_mesh(struct net_device *dev)
3307 {
3308 struct ieee80211_if_sta *ifsta;
3309 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3310 ifsta = &sdata->u.sta;
3311 ifsta->state = IEEE80211_MESH_UP;
3312 ieee80211_sta_timer((unsigned long)sdata);
3313 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3314 }
3315 #endif
3316
3317
3318 void ieee80211_sta_timer(unsigned long data)
3319 {
3320 struct ieee80211_sub_if_data *sdata =
3321 (struct ieee80211_sub_if_data *) data;
3322 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3323 struct ieee80211_local *local = wdev_priv(&sdata->wdev);
3324
3325 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3326 queue_work(local->hw.workqueue, &ifsta->work);
3327 }
3328
3329 void ieee80211_sta_work(struct work_struct *work)
3330 {
3331 struct ieee80211_sub_if_data *sdata =
3332 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
3333 struct net_device *dev = sdata->dev;
3334 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3335 struct ieee80211_if_sta *ifsta;
3336 struct sk_buff *skb;
3337
3338 if (!netif_running(dev))
3339 return;
3340
3341 if (local->sta_sw_scanning || local->sta_hw_scanning)
3342 return;
3343
3344 if (WARN_ON(sdata->vif.type != IEEE80211_IF_TYPE_STA &&
3345 sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
3346 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
3347 return;
3348 ifsta = &sdata->u.sta;
3349
3350 while ((skb = skb_dequeue(&ifsta->skb_queue)))
3351 ieee80211_sta_rx_queued_mgmt(dev, skb);
3352
3353 #ifdef CONFIG_MAC80211_MESH
3354 if (ifsta->preq_queue_len &&
3355 time_after(jiffies,
3356 ifsta->last_preq + msecs_to_jiffies(ifsta->mshcfg.dot11MeshHWMPpreqMinInterval)))
3357 mesh_path_start_discovery(dev);
3358 #endif
3359
3360 if (ifsta->state != IEEE80211_AUTHENTICATE &&
3361 ifsta->state != IEEE80211_ASSOCIATE &&
3362 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
3363 if (ifsta->scan_ssid_len)
3364 ieee80211_sta_start_scan(dev, ifsta->scan_ssid, ifsta->scan_ssid_len);
3365 else
3366 ieee80211_sta_start_scan(dev, NULL, 0);
3367 return;
3368 }
3369
3370 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
3371 if (ieee80211_sta_config_auth(dev, ifsta))
3372 return;
3373 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3374 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
3375 return;
3376
3377 switch (ifsta->state) {
3378 case IEEE80211_DISABLED:
3379 break;
3380 case IEEE80211_AUTHENTICATE:
3381 ieee80211_authenticate(dev, ifsta);
3382 break;
3383 case IEEE80211_ASSOCIATE:
3384 ieee80211_associate(dev, ifsta);
3385 break;
3386 case IEEE80211_ASSOCIATED:
3387 ieee80211_associated(dev, ifsta);
3388 break;
3389 case IEEE80211_IBSS_SEARCH:
3390 ieee80211_sta_find_ibss(dev, ifsta);
3391 break;
3392 case IEEE80211_IBSS_JOINED:
3393 ieee80211_sta_merge_ibss(dev, ifsta);
3394 break;
3395 #ifdef CONFIG_MAC80211_MESH
3396 case IEEE80211_MESH_UP:
3397 ieee80211_mesh_housekeeping(dev, ifsta);
3398 break;
3399 #endif
3400 default:
3401 WARN_ON(1);
3402 break;
3403 }
3404
3405 if (ieee80211_privacy_mismatch(dev, ifsta)) {
3406 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
3407 "mixed-cell disabled - disassociate\n", dev->name);
3408
3409 ieee80211_send_disassoc(dev, ifsta, WLAN_REASON_UNSPECIFIED);
3410 ieee80211_set_disassoc(dev, ifsta, 0);
3411 }
3412 }
3413
3414
3415 static void ieee80211_sta_reset_auth(struct net_device *dev,
3416 struct ieee80211_if_sta *ifsta)
3417 {
3418 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3419
3420 if (local->ops->reset_tsf) {
3421 /* Reset own TSF to allow time synchronization work. */
3422 local->ops->reset_tsf(local_to_hw(local));
3423 }
3424
3425 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
3426
3427
3428 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
3429 ifsta->auth_alg = WLAN_AUTH_OPEN;
3430 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
3431 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
3432 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
3433 ifsta->auth_alg = WLAN_AUTH_LEAP;
3434 else
3435 ifsta->auth_alg = WLAN_AUTH_OPEN;
3436 ifsta->auth_transaction = -1;
3437 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
3438 ifsta->auth_tries = ifsta->assoc_tries = 0;
3439 netif_carrier_off(dev);
3440 }
3441
3442
3443 void ieee80211_sta_req_auth(struct net_device *dev,
3444 struct ieee80211_if_sta *ifsta)
3445 {
3446 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3447 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3448
3449 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3450 return;
3451
3452 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
3453 IEEE80211_STA_AUTO_BSSID_SEL)) &&
3454 (ifsta->flags & (IEEE80211_STA_SSID_SET |
3455 IEEE80211_STA_AUTO_SSID_SEL))) {
3456 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3457 queue_work(local->hw.workqueue, &ifsta->work);
3458 }
3459 }
3460
3461 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
3462 const char *ssid, int ssid_len)
3463 {
3464 int tmp, hidden_ssid;
3465
3466 if (ssid_len == ifsta->ssid_len &&
3467 !memcmp(ifsta->ssid, ssid, ssid_len))
3468 return 1;
3469
3470 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
3471 return 0;
3472
3473 hidden_ssid = 1;
3474 tmp = ssid_len;
3475 while (tmp--) {
3476 if (ssid[tmp] != '\0') {
3477 hidden_ssid = 0;
3478 break;
3479 }
3480 }
3481
3482 if (hidden_ssid && ifsta->ssid_len == ssid_len)
3483 return 1;
3484
3485 if (ssid_len == 1 && ssid[0] == ' ')
3486 return 1;
3487
3488 return 0;
3489 }
3490
3491 static int ieee80211_sta_config_auth(struct net_device *dev,
3492 struct ieee80211_if_sta *ifsta)
3493 {
3494 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3495 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3496 struct ieee80211_sta_bss *bss, *selected = NULL;
3497 int top_rssi = 0, freq;
3498
3499 spin_lock_bh(&local->sta_bss_lock);
3500 freq = local->oper_channel->center_freq;
3501 list_for_each_entry(bss, &local->sta_bss_list, list) {
3502 if (!(bss->capability & WLAN_CAPABILITY_ESS))
3503 continue;
3504
3505 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
3506 IEEE80211_STA_AUTO_BSSID_SEL |
3507 IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
3508 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
3509 !!sdata->default_key))
3510 continue;
3511
3512 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
3513 bss->freq != freq)
3514 continue;
3515
3516 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
3517 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
3518 continue;
3519
3520 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
3521 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
3522 continue;
3523
3524 if (!selected || top_rssi < bss->signal) {
3525 selected = bss;
3526 top_rssi = bss->signal;
3527 }
3528 }
3529 if (selected)
3530 atomic_inc(&selected->users);
3531 spin_unlock_bh(&local->sta_bss_lock);
3532
3533 if (selected) {
3534 ieee80211_set_freq(dev, selected->freq);
3535 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
3536 ieee80211_sta_set_ssid(dev, selected->ssid,
3537 selected->ssid_len);
3538 ieee80211_sta_set_bssid(dev, selected->bssid);
3539 ieee80211_sta_def_wmm_params(dev, selected, 0);
3540 ieee80211_rx_bss_put(local, selected);
3541 ifsta->state = IEEE80211_AUTHENTICATE;
3542 ieee80211_sta_reset_auth(dev, ifsta);
3543 return 0;
3544 } else {
3545 if (ifsta->state != IEEE80211_AUTHENTICATE) {
3546 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
3547 ieee80211_sta_start_scan(dev, NULL, 0);
3548 else
3549 ieee80211_sta_start_scan(dev, ifsta->ssid,
3550 ifsta->ssid_len);
3551 ifsta->state = IEEE80211_AUTHENTICATE;
3552 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3553 } else
3554 ifsta->state = IEEE80211_DISABLED;
3555 }
3556 return -1;
3557 }
3558
3559
3560 static int ieee80211_sta_create_ibss(struct net_device *dev,
3561 struct ieee80211_if_sta *ifsta)
3562 {
3563 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3564 struct ieee80211_sta_bss *bss;
3565 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3566 struct ieee80211_supported_band *sband;
3567 u8 bssid[ETH_ALEN], *pos;
3568 int i;
3569 int ret;
3570 DECLARE_MAC_BUF(mac);
3571
3572 #if 0
3573 /* Easier testing, use fixed BSSID. */
3574 memset(bssid, 0xfe, ETH_ALEN);
3575 #else
3576 /* Generate random, not broadcast, locally administered BSSID. Mix in
3577 * own MAC address to make sure that devices that do not have proper
3578 * random number generator get different BSSID. */
3579 get_random_bytes(bssid, ETH_ALEN);
3580 for (i = 0; i < ETH_ALEN; i++)
3581 bssid[i] ^= dev->dev_addr[i];
3582 bssid[0] &= ~0x01;
3583 bssid[0] |= 0x02;
3584 #endif
3585
3586 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
3587 dev->name, print_mac(mac, bssid));
3588
3589 bss = ieee80211_rx_bss_add(dev, bssid,
3590 local->hw.conf.channel->center_freq,
3591 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
3592 if (!bss)
3593 return -ENOMEM;
3594
3595 bss->band = local->hw.conf.channel->band;
3596 sband = local->hw.wiphy->bands[bss->band];
3597
3598 if (local->hw.conf.beacon_int == 0)
3599 local->hw.conf.beacon_int = 100;
3600 bss->beacon_int = local->hw.conf.beacon_int;
3601 bss->last_update = jiffies;
3602 bss->capability = WLAN_CAPABILITY_IBSS;
3603
3604 if (sdata->default_key)
3605 bss->capability |= WLAN_CAPABILITY_PRIVACY;
3606 else
3607 sdata->drop_unencrypted = 0;
3608
3609 bss->supp_rates_len = sband->n_bitrates;
3610 pos = bss->supp_rates;
3611 for (i = 0; i < sband->n_bitrates; i++) {
3612 int rate = sband->bitrates[i].bitrate;
3613 *pos++ = (u8) (rate / 5);
3614 }
3615
3616 ret = ieee80211_sta_join_ibss(dev, ifsta, bss);
3617 ieee80211_rx_bss_put(local, bss);
3618 return ret;
3619 }
3620
3621
3622 static int ieee80211_sta_find_ibss(struct net_device *dev,
3623 struct ieee80211_if_sta *ifsta)
3624 {
3625 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3626 struct ieee80211_sta_bss *bss;
3627 int found = 0;
3628 u8 bssid[ETH_ALEN];
3629 int active_ibss;
3630 DECLARE_MAC_BUF(mac);
3631 DECLARE_MAC_BUF(mac2);
3632
3633 if (ifsta->ssid_len == 0)
3634 return -EINVAL;
3635
3636 active_ibss = ieee80211_sta_active_ibss(dev);
3637 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3638 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
3639 dev->name, active_ibss);
3640 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3641 spin_lock_bh(&local->sta_bss_lock);
3642 list_for_each_entry(bss, &local->sta_bss_list, list) {
3643 if (ifsta->ssid_len != bss->ssid_len ||
3644 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
3645 || !(bss->capability & WLAN_CAPABILITY_IBSS))
3646 continue;
3647 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3648 printk(KERN_DEBUG " bssid=%s found\n",
3649 print_mac(mac, bss->bssid));
3650 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3651 memcpy(bssid, bss->bssid, ETH_ALEN);
3652 found = 1;
3653 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
3654 break;
3655 }
3656 spin_unlock_bh(&local->sta_bss_lock);
3657
3658 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3659 if (found)
3660 printk(KERN_DEBUG " sta_find_ibss: selected %s current "
3661 "%s\n", print_mac(mac, bssid),
3662 print_mac(mac2, ifsta->bssid));
3663 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3664 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
3665 (bss = ieee80211_rx_bss_get(dev, bssid,
3666 local->hw.conf.channel->center_freq,
3667 ifsta->ssid, ifsta->ssid_len))) {
3668 int ret;
3669 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
3670 " based on configured SSID\n",
3671 dev->name, print_mac(mac, bssid));
3672 ret = ieee80211_sta_join_ibss(dev, ifsta, bss);
3673 ieee80211_rx_bss_put(local, bss);
3674 return ret;
3675 }
3676 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3677 printk(KERN_DEBUG " did not try to join ibss\n");
3678 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3679
3680 /* Selected IBSS not found in current scan results - try to scan */
3681 if (ifsta->state == IEEE80211_IBSS_JOINED &&
3682 !ieee80211_sta_active_ibss(dev)) {
3683 mod_timer(&ifsta->timer, jiffies +
3684 IEEE80211_IBSS_MERGE_INTERVAL);
3685 } else if (time_after(jiffies, local->last_scan_completed +
3686 IEEE80211_SCAN_INTERVAL)) {
3687 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
3688 "join\n", dev->name);
3689 return ieee80211_sta_req_scan(dev, ifsta->ssid,
3690 ifsta->ssid_len);
3691 } else if (ifsta->state != IEEE80211_IBSS_JOINED) {
3692 int interval = IEEE80211_SCAN_INTERVAL;
3693
3694 if (time_after(jiffies, ifsta->ibss_join_req +
3695 IEEE80211_IBSS_JOIN_TIMEOUT)) {
3696 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
3697 (!(local->oper_channel->flags &
3698 IEEE80211_CHAN_NO_IBSS)))
3699 return ieee80211_sta_create_ibss(dev, ifsta);
3700 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
3701 printk(KERN_DEBUG "%s: IBSS not allowed on"
3702 " %d MHz\n", dev->name,
3703 local->hw.conf.channel->center_freq);
3704 }
3705
3706 /* No IBSS found - decrease scan interval and continue
3707 * scanning. */
3708 interval = IEEE80211_SCAN_INTERVAL_SLOW;
3709 }
3710
3711 ifsta->state = IEEE80211_IBSS_SEARCH;
3712 mod_timer(&ifsta->timer, jiffies + interval);
3713 return 0;
3714 }
3715
3716 return 0;
3717 }
3718
3719
3720 int ieee80211_sta_set_ssid(struct net_device *dev, char *ssid, size_t len)
3721 {
3722 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3723 struct ieee80211_if_sta *ifsta;
3724 int res;
3725
3726 if (len > IEEE80211_MAX_SSID_LEN)
3727 return -EINVAL;
3728
3729 ifsta = &sdata->u.sta;
3730
3731 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
3732 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
3733 memcpy(ifsta->ssid, ssid, len);
3734 ifsta->ssid_len = len;
3735 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
3736
3737 res = 0;
3738 /*
3739 * Hack! MLME code needs to be cleaned up to have different
3740 * entry points for configuration and internal selection change
3741 */
3742 if (netif_running(sdata->dev))
3743 res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
3744 if (res) {
3745 printk(KERN_DEBUG "%s: Failed to config new SSID to "
3746 "the low-level driver\n", dev->name);
3747 return res;
3748 }
3749 }
3750
3751 if (len)
3752 ifsta->flags |= IEEE80211_STA_SSID_SET;
3753 else
3754 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
3755
3756 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3757 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
3758 ifsta->ibss_join_req = jiffies;
3759 ifsta->state = IEEE80211_IBSS_SEARCH;
3760 return ieee80211_sta_find_ibss(dev, ifsta);
3761 }
3762
3763 return 0;
3764 }
3765
3766
3767 int ieee80211_sta_get_ssid(struct net_device *dev, char *ssid, size_t *len)
3768 {
3769 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3770 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3771 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
3772 *len = ifsta->ssid_len;
3773 return 0;
3774 }
3775
3776
3777 int ieee80211_sta_set_bssid(struct net_device *dev, u8 *bssid)
3778 {
3779 struct ieee80211_sub_if_data *sdata;
3780 struct ieee80211_if_sta *ifsta;
3781 int res;
3782
3783 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3784 ifsta = &sdata->u.sta;
3785
3786 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3787 memcpy(ifsta->bssid, bssid, ETH_ALEN);
3788 res = 0;
3789 /*
3790 * Hack! See also ieee80211_sta_set_ssid.
3791 */
3792 if (netif_running(sdata->dev))
3793 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
3794 if (res) {
3795 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
3796 "the low-level driver\n", dev->name);
3797 return res;
3798 }
3799 }
3800
3801 if (is_valid_ether_addr(bssid))
3802 ifsta->flags |= IEEE80211_STA_BSSID_SET;
3803 else
3804 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
3805
3806 return 0;
3807 }
3808
3809
3810 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
3811 struct ieee80211_sub_if_data *sdata,
3812 int powersave)
3813 {
3814 struct sk_buff *skb;
3815 struct ieee80211_hdr *nullfunc;
3816 __le16 fc;
3817
3818 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
3819 if (!skb) {
3820 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
3821 "frame\n", sdata->dev->name);
3822 return;
3823 }
3824 skb_reserve(skb, local->hw.extra_tx_headroom);
3825
3826 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
3827 memset(nullfunc, 0, 24);
3828 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
3829 IEEE80211_FCTL_TODS);
3830 if (powersave)
3831 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
3832 nullfunc->frame_control = fc;
3833 memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
3834 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
3835 memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
3836
3837 ieee80211_sta_tx(sdata->dev, skb, 0);
3838 }
3839
3840
3841 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3842 {
3843 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
3844 ieee80211_vif_is_mesh(&sdata->vif))
3845 ieee80211_sta_timer((unsigned long)sdata);
3846 }
3847
3848 void ieee80211_scan_completed(struct ieee80211_hw *hw)
3849 {
3850 struct ieee80211_local *local = hw_to_local(hw);
3851 struct net_device *dev = local->scan_dev;
3852 struct ieee80211_sub_if_data *sdata;
3853 union iwreq_data wrqu;
3854
3855 local->last_scan_completed = jiffies;
3856 memset(&wrqu, 0, sizeof(wrqu));
3857 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
3858
3859 if (local->sta_hw_scanning) {
3860 local->sta_hw_scanning = 0;
3861 if (ieee80211_hw_config(local))
3862 printk(KERN_DEBUG "%s: failed to restore operational "
3863 "channel after scan\n", dev->name);
3864 /* Restart STA timer for HW scan case */
3865 rcu_read_lock();
3866 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3867 ieee80211_restart_sta_timer(sdata);
3868 rcu_read_unlock();
3869
3870 goto done;
3871 }
3872
3873 local->sta_sw_scanning = 0;
3874 if (ieee80211_hw_config(local))
3875 printk(KERN_DEBUG "%s: failed to restore operational "
3876 "channel after scan\n", dev->name);
3877
3878
3879 netif_tx_lock_bh(local->mdev);
3880 netif_addr_lock(local->mdev);
3881 local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
3882 local->ops->configure_filter(local_to_hw(local),
3883 FIF_BCN_PRBRESP_PROMISC,
3884 &local->filter_flags,
3885 local->mdev->mc_count,
3886 local->mdev->mc_list);
3887
3888 netif_addr_unlock(local->mdev);
3889 netif_tx_unlock_bh(local->mdev);
3890
3891 rcu_read_lock();
3892 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3893 /* Tell AP we're back */
3894 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
3895 sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED)
3896 ieee80211_send_nullfunc(local, sdata, 0);
3897
3898 ieee80211_restart_sta_timer(sdata);
3899
3900 netif_wake_queue(sdata->dev);
3901 }
3902 rcu_read_unlock();
3903
3904 done:
3905 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3906 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
3907 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3908 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
3909 (!ifsta->state == IEEE80211_IBSS_JOINED &&
3910 !ieee80211_sta_active_ibss(dev)))
3911 ieee80211_sta_find_ibss(dev, ifsta);
3912 }
3913 }
3914 EXPORT_SYMBOL(ieee80211_scan_completed);
3915
3916 void ieee80211_sta_scan_work(struct work_struct *work)
3917 {
3918 struct ieee80211_local *local =
3919 container_of(work, struct ieee80211_local, scan_work.work);
3920 struct net_device *dev = local->scan_dev;
3921 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3922 struct ieee80211_supported_band *sband;
3923 struct ieee80211_channel *chan;
3924 int skip;
3925 unsigned long next_delay = 0;
3926
3927 if (!local->sta_sw_scanning)
3928 return;
3929
3930 switch (local->scan_state) {
3931 case SCAN_SET_CHANNEL:
3932 /*
3933 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
3934 * after we successfully scanned the last channel of the last
3935 * band (and the last band is supported by the hw)
3936 */
3937 if (local->scan_band < IEEE80211_NUM_BANDS)
3938 sband = local->hw.wiphy->bands[local->scan_band];
3939 else
3940 sband = NULL;
3941
3942 /*
3943 * If we are at an unsupported band and have more bands
3944 * left to scan, advance to the next supported one.
3945 */
3946 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
3947 local->scan_band++;
3948 sband = local->hw.wiphy->bands[local->scan_band];
3949 local->scan_channel_idx = 0;
3950 }
3951
3952 /* if no more bands/channels left, complete scan */
3953 if (!sband || local->scan_channel_idx >= sband->n_channels) {
3954 ieee80211_scan_completed(local_to_hw(local));
3955 return;
3956 }
3957 skip = 0;
3958 chan = &sband->channels[local->scan_channel_idx];
3959
3960 if (chan->flags & IEEE80211_CHAN_DISABLED ||
3961 (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3962 chan->flags & IEEE80211_CHAN_NO_IBSS))
3963 skip = 1;
3964
3965 if (!skip) {
3966 local->scan_channel = chan;
3967 if (ieee80211_hw_config(local)) {
3968 printk(KERN_DEBUG "%s: failed to set freq to "
3969 "%d MHz for scan\n", dev->name,
3970 chan->center_freq);
3971 skip = 1;
3972 }
3973 }
3974
3975 /* advance state machine to next channel/band */
3976 local->scan_channel_idx++;
3977 if (local->scan_channel_idx >= sband->n_channels) {
3978 /*
3979 * scan_band may end up == IEEE80211_NUM_BANDS, but
3980 * we'll catch that case above and complete the scan
3981 * if that is the case.
3982 */
3983 local->scan_band++;
3984 local->scan_channel_idx = 0;
3985 }
3986
3987 if (skip)
3988 break;
3989
3990 next_delay = IEEE80211_PROBE_DELAY +
3991 usecs_to_jiffies(local->hw.channel_change_time);
3992 local->scan_state = SCAN_SEND_PROBE;
3993 break;
3994 case SCAN_SEND_PROBE:
3995 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
3996 local->scan_state = SCAN_SET_CHANNEL;
3997
3998 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
3999 break;
4000 ieee80211_send_probe_req(dev, NULL, local->scan_ssid,
4001 local->scan_ssid_len);
4002 next_delay = IEEE80211_CHANNEL_TIME;
4003 break;
4004 }
4005
4006 if (local->sta_sw_scanning)
4007 queue_delayed_work(local->hw.workqueue, &local->scan_work,
4008 next_delay);
4009 }
4010
4011
4012 static int ieee80211_sta_start_scan(struct net_device *dev,
4013 u8 *ssid, size_t ssid_len)
4014 {
4015 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4016 struct ieee80211_sub_if_data *sdata;
4017
4018 if (ssid_len > IEEE80211_MAX_SSID_LEN)
4019 return -EINVAL;
4020
4021 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
4022 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
4023 * BSSID: MACAddress
4024 * SSID
4025 * ScanType: ACTIVE, PASSIVE
4026 * ProbeDelay: delay (in microseconds) to be used prior to transmitting
4027 * a Probe frame during active scanning
4028 * ChannelList
4029 * MinChannelTime (>= ProbeDelay), in TU
4030 * MaxChannelTime: (>= MinChannelTime), in TU
4031 */
4032
4033 /* MLME-SCAN.confirm
4034 * BSSDescriptionSet
4035 * ResultCode: SUCCESS, INVALID_PARAMETERS
4036 */
4037
4038 if (local->sta_sw_scanning || local->sta_hw_scanning) {
4039 if (local->scan_dev == dev)
4040 return 0;
4041 return -EBUSY;
4042 }
4043
4044 if (local->ops->hw_scan) {
4045 int rc = local->ops->hw_scan(local_to_hw(local),
4046 ssid, ssid_len);
4047 if (!rc) {
4048 local->sta_hw_scanning = 1;
4049 local->scan_dev = dev;
4050 }
4051 return rc;
4052 }
4053
4054 local->sta_sw_scanning = 1;
4055
4056 rcu_read_lock();
4057 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4058 netif_stop_queue(sdata->dev);
4059 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
4060 (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED))
4061 ieee80211_send_nullfunc(local, sdata, 1);
4062 }
4063 rcu_read_unlock();
4064
4065 if (ssid) {
4066 local->scan_ssid_len = ssid_len;
4067 memcpy(local->scan_ssid, ssid, ssid_len);
4068 } else
4069 local->scan_ssid_len = 0;
4070 local->scan_state = SCAN_SET_CHANNEL;
4071 local->scan_channel_idx = 0;
4072 local->scan_band = IEEE80211_BAND_2GHZ;
4073 local->scan_dev = dev;
4074
4075 netif_addr_lock_bh(local->mdev);
4076 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
4077 local->ops->configure_filter(local_to_hw(local),
4078 FIF_BCN_PRBRESP_PROMISC,
4079 &local->filter_flags,
4080 local->mdev->mc_count,
4081 local->mdev->mc_list);
4082 netif_addr_unlock_bh(local->mdev);
4083
4084 /* TODO: start scan as soon as all nullfunc frames are ACKed */
4085 queue_delayed_work(local->hw.workqueue, &local->scan_work,
4086 IEEE80211_CHANNEL_TIME);
4087
4088 return 0;
4089 }
4090
4091
4092 int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len)
4093 {
4094 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4095 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4096 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4097
4098 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4099 return ieee80211_sta_start_scan(dev, ssid, ssid_len);
4100
4101 if (local->sta_sw_scanning || local->sta_hw_scanning) {
4102 if (local->scan_dev == dev)
4103 return 0;
4104 return -EBUSY;
4105 }
4106
4107 ifsta->scan_ssid_len = ssid_len;
4108 if (ssid_len)
4109 memcpy(ifsta->scan_ssid, ssid, ssid_len);
4110 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
4111 queue_work(local->hw.workqueue, &ifsta->work);
4112 return 0;
4113 }
4114
4115 static char *
4116 ieee80211_sta_scan_result(struct net_device *dev,
4117 struct iw_request_info *info,
4118 struct ieee80211_sta_bss *bss,
4119 char *current_ev, char *end_buf)
4120 {
4121 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4122 struct iw_event iwe;
4123
4124 if (time_after(jiffies,
4125 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
4126 return current_ev;
4127
4128 memset(&iwe, 0, sizeof(iwe));
4129 iwe.cmd = SIOCGIWAP;
4130 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
4131 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
4132 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4133 IW_EV_ADDR_LEN);
4134
4135 memset(&iwe, 0, sizeof(iwe));
4136 iwe.cmd = SIOCGIWESSID;
4137 if (bss_mesh_cfg(bss)) {
4138 iwe.u.data.length = bss_mesh_id_len(bss);
4139 iwe.u.data.flags = 1;
4140 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4141 &iwe, bss_mesh_id(bss));
4142 } else {
4143 iwe.u.data.length = bss->ssid_len;
4144 iwe.u.data.flags = 1;
4145 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4146 &iwe, bss->ssid);
4147 }
4148
4149 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
4150 || bss_mesh_cfg(bss)) {
4151 memset(&iwe, 0, sizeof(iwe));
4152 iwe.cmd = SIOCGIWMODE;
4153 if (bss_mesh_cfg(bss))
4154 iwe.u.mode = IW_MODE_MESH;
4155 else if (bss->capability & WLAN_CAPABILITY_ESS)
4156 iwe.u.mode = IW_MODE_MASTER;
4157 else
4158 iwe.u.mode = IW_MODE_ADHOC;
4159 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
4160 &iwe, IW_EV_UINT_LEN);
4161 }
4162
4163 memset(&iwe, 0, sizeof(iwe));
4164 iwe.cmd = SIOCGIWFREQ;
4165 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
4166 iwe.u.freq.e = 0;
4167 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4168 IW_EV_FREQ_LEN);
4169
4170 memset(&iwe, 0, sizeof(iwe));
4171 iwe.cmd = SIOCGIWFREQ;
4172 iwe.u.freq.m = bss->freq;
4173 iwe.u.freq.e = 6;
4174 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4175 IW_EV_FREQ_LEN);
4176 memset(&iwe, 0, sizeof(iwe));
4177 iwe.cmd = IWEVQUAL;
4178 iwe.u.qual.qual = bss->qual;
4179 iwe.u.qual.level = bss->signal;
4180 iwe.u.qual.noise = bss->noise;
4181 iwe.u.qual.updated = local->wstats_flags;
4182 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4183 IW_EV_QUAL_LEN);
4184
4185 memset(&iwe, 0, sizeof(iwe));
4186 iwe.cmd = SIOCGIWENCODE;
4187 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
4188 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
4189 else
4190 iwe.u.data.flags = IW_ENCODE_DISABLED;
4191 iwe.u.data.length = 0;
4192 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4193 &iwe, "");
4194
4195 if (bss && bss->wpa_ie) {
4196 memset(&iwe, 0, sizeof(iwe));
4197 iwe.cmd = IWEVGENIE;
4198 iwe.u.data.length = bss->wpa_ie_len;
4199 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4200 &iwe, bss->wpa_ie);
4201 }
4202
4203 if (bss && bss->rsn_ie) {
4204 memset(&iwe, 0, sizeof(iwe));
4205 iwe.cmd = IWEVGENIE;
4206 iwe.u.data.length = bss->rsn_ie_len;
4207 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4208 &iwe, bss->rsn_ie);
4209 }
4210
4211 if (bss && bss->ht_ie) {
4212 memset(&iwe, 0, sizeof(iwe));
4213 iwe.cmd = IWEVGENIE;
4214 iwe.u.data.length = bss->ht_ie_len;
4215 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4216 &iwe, bss->ht_ie);
4217 }
4218
4219 if (bss && bss->supp_rates_len > 0) {
4220 /* display all supported rates in readable format */
4221 char *p = current_ev + iwe_stream_lcp_len(info);
4222 int i;
4223
4224 memset(&iwe, 0, sizeof(iwe));
4225 iwe.cmd = SIOCGIWRATE;
4226 /* Those two flags are ignored... */
4227 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
4228
4229 for (i = 0; i < bss->supp_rates_len; i++) {
4230 iwe.u.bitrate.value = ((bss->supp_rates[i] &
4231 0x7f) * 500000);
4232 p = iwe_stream_add_value(info, current_ev, p,
4233 end_buf, &iwe, IW_EV_PARAM_LEN);
4234 }
4235 current_ev = p;
4236 }
4237
4238 if (bss) {
4239 char *buf;
4240 buf = kmalloc(30, GFP_ATOMIC);
4241 if (buf) {
4242 memset(&iwe, 0, sizeof(iwe));
4243 iwe.cmd = IWEVCUSTOM;
4244 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
4245 iwe.u.data.length = strlen(buf);
4246 current_ev = iwe_stream_add_point(info, current_ev,
4247 end_buf,
4248 &iwe, buf);
4249 memset(&iwe, 0, sizeof(iwe));
4250 iwe.cmd = IWEVCUSTOM;
4251 sprintf(buf, " Last beacon: %dms ago",
4252 jiffies_to_msecs(jiffies - bss->last_update));
4253 iwe.u.data.length = strlen(buf);
4254 current_ev = iwe_stream_add_point(info, current_ev,
4255 end_buf, &iwe, buf);
4256 kfree(buf);
4257 }
4258 }
4259
4260 if (bss_mesh_cfg(bss)) {
4261 char *buf;
4262 u8 *cfg = bss_mesh_cfg(bss);
4263 buf = kmalloc(50, GFP_ATOMIC);
4264 if (buf) {
4265 memset(&iwe, 0, sizeof(iwe));
4266 iwe.cmd = IWEVCUSTOM;
4267 sprintf(buf, "Mesh network (version %d)", cfg[0]);
4268 iwe.u.data.length = strlen(buf);
4269 current_ev = iwe_stream_add_point(info, current_ev,
4270 end_buf,
4271 &iwe, buf);
4272 sprintf(buf, "Path Selection Protocol ID: "
4273 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
4274 cfg[4]);
4275 iwe.u.data.length = strlen(buf);
4276 current_ev = iwe_stream_add_point(info, current_ev,
4277 end_buf,
4278 &iwe, buf);
4279 sprintf(buf, "Path Selection Metric ID: "
4280 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
4281 cfg[8]);
4282 iwe.u.data.length = strlen(buf);
4283 current_ev = iwe_stream_add_point(info, current_ev,
4284 end_buf,
4285 &iwe, buf);
4286 sprintf(buf, "Congestion Control Mode ID: "
4287 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
4288 cfg[11], cfg[12]);
4289 iwe.u.data.length = strlen(buf);
4290 current_ev = iwe_stream_add_point(info, current_ev,
4291 end_buf,
4292 &iwe, buf);
4293 sprintf(buf, "Channel Precedence: "
4294 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
4295 cfg[15], cfg[16]);
4296 iwe.u.data.length = strlen(buf);
4297 current_ev = iwe_stream_add_point(info, current_ev,
4298 end_buf,
4299 &iwe, buf);
4300 kfree(buf);
4301 }
4302 }
4303
4304 return current_ev;
4305 }
4306
4307
4308 int ieee80211_sta_scan_results(struct net_device *dev,
4309 struct iw_request_info *info,
4310 char *buf, size_t len)
4311 {
4312 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4313 char *current_ev = buf;
4314 char *end_buf = buf + len;
4315 struct ieee80211_sta_bss *bss;
4316
4317 spin_lock_bh(&local->sta_bss_lock);
4318 list_for_each_entry(bss, &local->sta_bss_list, list) {
4319 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
4320 spin_unlock_bh(&local->sta_bss_lock);
4321 return -E2BIG;
4322 }
4323 current_ev = ieee80211_sta_scan_result(dev, info, bss,
4324 current_ev, end_buf);
4325 }
4326 spin_unlock_bh(&local->sta_bss_lock);
4327 return current_ev - buf;
4328 }
4329
4330
4331 int ieee80211_sta_set_extra_ie(struct net_device *dev, char *ie, size_t len)
4332 {
4333 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4334 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4335
4336 kfree(ifsta->extra_ie);
4337 if (len == 0) {
4338 ifsta->extra_ie = NULL;
4339 ifsta->extra_ie_len = 0;
4340 return 0;
4341 }
4342 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
4343 if (!ifsta->extra_ie) {
4344 ifsta->extra_ie_len = 0;
4345 return -ENOMEM;
4346 }
4347 memcpy(ifsta->extra_ie, ie, len);
4348 ifsta->extra_ie_len = len;
4349 return 0;
4350 }
4351
4352
4353 struct sta_info *ieee80211_ibss_add_sta(struct net_device *dev,
4354 struct sk_buff *skb, u8 *bssid,
4355 u8 *addr, u64 supp_rates)
4356 {
4357 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4358 struct sta_info *sta;
4359 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4360 DECLARE_MAC_BUF(mac);
4361 int band = local->hw.conf.channel->band;
4362
4363 /* TODO: Could consider removing the least recently used entry and
4364 * allow new one to be added. */
4365 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
4366 if (net_ratelimit()) {
4367 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
4368 "entry %s\n", dev->name, print_mac(mac, addr));
4369 }
4370 return NULL;
4371 }
4372
4373 if (compare_ether_addr(bssid, sdata->u.sta.bssid))
4374 return NULL;
4375
4376 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
4377 printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
4378 wiphy_name(local->hw.wiphy), print_mac(mac, addr), dev->name);
4379 #endif
4380
4381 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
4382 if (!sta)
4383 return NULL;
4384
4385 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
4386
4387 if (supp_rates)
4388 sta->supp_rates[band] = supp_rates;
4389 else
4390 sta->supp_rates[band] = sdata->u.sta.supp_rates_bits[band];
4391
4392 rate_control_rate_init(sta, local);
4393
4394 if (sta_info_insert(sta))
4395 return NULL;
4396
4397 return sta;
4398 }
4399
4400
4401 int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason)
4402 {
4403 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4404 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4405
4406 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
4407 dev->name, reason);
4408
4409 if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
4410 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
4411 return -EINVAL;
4412
4413 ieee80211_send_deauth(dev, ifsta, reason);
4414 ieee80211_set_disassoc(dev, ifsta, 1);
4415 return 0;
4416 }
4417
4418
4419 int ieee80211_sta_disassociate(struct net_device *dev, u16 reason)
4420 {
4421 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4422 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4423
4424 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
4425 dev->name, reason);
4426
4427 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4428 return -EINVAL;
4429
4430 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
4431 return -1;
4432
4433 ieee80211_send_disassoc(dev, ifsta, reason);
4434 ieee80211_set_disassoc(dev, ifsta, 0);
4435 return 0;
4436 }
4437
4438 void ieee80211_notify_mac(struct ieee80211_hw *hw,
4439 enum ieee80211_notification_types notif_type)
4440 {
4441 struct ieee80211_local *local = hw_to_local(hw);
4442 struct ieee80211_sub_if_data *sdata;
4443
4444 switch (notif_type) {
4445 case IEEE80211_NOTIFY_RE_ASSOC:
4446 rcu_read_lock();
4447 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4448 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4449 continue;
4450
4451 ieee80211_sta_req_auth(sdata->dev, &sdata->u.sta);
4452 }
4453 rcu_read_unlock();
4454 break;
4455 }
4456 }
4457 EXPORT_SYMBOL(ieee80211_notify_mac);
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