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mac80211: use hardware flags for signal/noise units
[mirror_ubuntu-zesty-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 (20 * HZ)
48
49 #define IEEE80211_PROBE_DELAY (HZ / 33)
50 #define IEEE80211_CHANNEL_TIME (HZ / 33)
51 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
52 #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
53 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
54 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
55 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
56
57 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
58
59
60 #define ERP_INFO_USE_PROTECTION BIT(1)
61
62 /* mgmt header + 1 byte action code */
63 #define IEEE80211_MIN_ACTION_SIZE (24 + 1)
64
65 #define IEEE80211_ADDBA_PARAM_POLICY_MASK 0x0002
66 #define IEEE80211_ADDBA_PARAM_TID_MASK 0x003C
67 #define IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK 0xFFA0
68 #define IEEE80211_DELBA_PARAM_TID_MASK 0xF000
69 #define IEEE80211_DELBA_PARAM_INITIATOR_MASK 0x0800
70
71 /* next values represent the buffer size for A-MPDU frame.
72 * According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2) */
73 #define IEEE80211_MIN_AMPDU_BUF 0x8
74 #define IEEE80211_MAX_AMPDU_BUF 0x40
75
76 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
77 u8 *ssid, size_t ssid_len);
78 static struct ieee80211_sta_bss *
79 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int freq,
80 u8 *ssid, u8 ssid_len);
81 static void ieee80211_rx_bss_put(struct net_device *dev,
82 struct ieee80211_sta_bss *bss);
83 static int ieee80211_sta_find_ibss(struct net_device *dev,
84 struct ieee80211_if_sta *ifsta);
85 static int ieee80211_sta_wep_configured(struct net_device *dev);
86 static int ieee80211_sta_start_scan(struct net_device *dev,
87 u8 *ssid, size_t ssid_len);
88 static int ieee80211_sta_config_auth(struct net_device *dev,
89 struct ieee80211_if_sta *ifsta);
90 static void sta_rx_agg_session_timer_expired(unsigned long data);
91
92
93 void ieee802_11_parse_elems(u8 *start, size_t len,
94 struct ieee802_11_elems *elems)
95 {
96 size_t left = len;
97 u8 *pos = start;
98
99 memset(elems, 0, sizeof(*elems));
100
101 while (left >= 2) {
102 u8 id, elen;
103
104 id = *pos++;
105 elen = *pos++;
106 left -= 2;
107
108 if (elen > left)
109 return;
110
111 switch (id) {
112 case WLAN_EID_SSID:
113 elems->ssid = pos;
114 elems->ssid_len = elen;
115 break;
116 case WLAN_EID_SUPP_RATES:
117 elems->supp_rates = pos;
118 elems->supp_rates_len = elen;
119 break;
120 case WLAN_EID_FH_PARAMS:
121 elems->fh_params = pos;
122 elems->fh_params_len = elen;
123 break;
124 case WLAN_EID_DS_PARAMS:
125 elems->ds_params = pos;
126 elems->ds_params_len = elen;
127 break;
128 case WLAN_EID_CF_PARAMS:
129 elems->cf_params = pos;
130 elems->cf_params_len = elen;
131 break;
132 case WLAN_EID_TIM:
133 elems->tim = pos;
134 elems->tim_len = elen;
135 break;
136 case WLAN_EID_IBSS_PARAMS:
137 elems->ibss_params = pos;
138 elems->ibss_params_len = elen;
139 break;
140 case WLAN_EID_CHALLENGE:
141 elems->challenge = pos;
142 elems->challenge_len = elen;
143 break;
144 case WLAN_EID_WPA:
145 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
146 pos[2] == 0xf2) {
147 /* Microsoft OUI (00:50:F2) */
148 if (pos[3] == 1) {
149 /* OUI Type 1 - WPA IE */
150 elems->wpa = pos;
151 elems->wpa_len = elen;
152 } else if (elen >= 5 && pos[3] == 2) {
153 if (pos[4] == 0) {
154 elems->wmm_info = pos;
155 elems->wmm_info_len = elen;
156 } else if (pos[4] == 1) {
157 elems->wmm_param = pos;
158 elems->wmm_param_len = elen;
159 }
160 }
161 }
162 break;
163 case WLAN_EID_RSN:
164 elems->rsn = pos;
165 elems->rsn_len = elen;
166 break;
167 case WLAN_EID_ERP_INFO:
168 elems->erp_info = pos;
169 elems->erp_info_len = elen;
170 break;
171 case WLAN_EID_EXT_SUPP_RATES:
172 elems->ext_supp_rates = pos;
173 elems->ext_supp_rates_len = elen;
174 break;
175 case WLAN_EID_HT_CAPABILITY:
176 elems->ht_cap_elem = pos;
177 elems->ht_cap_elem_len = elen;
178 break;
179 case WLAN_EID_HT_EXTRA_INFO:
180 elems->ht_info_elem = pos;
181 elems->ht_info_elem_len = elen;
182 break;
183 case WLAN_EID_MESH_ID:
184 elems->mesh_id = pos;
185 elems->mesh_id_len = elen;
186 break;
187 case WLAN_EID_MESH_CONFIG:
188 elems->mesh_config = pos;
189 elems->mesh_config_len = elen;
190 break;
191 case WLAN_EID_PEER_LINK:
192 elems->peer_link = pos;
193 elems->peer_link_len = elen;
194 break;
195 case WLAN_EID_PREQ:
196 elems->preq = pos;
197 elems->preq_len = elen;
198 break;
199 case WLAN_EID_PREP:
200 elems->prep = pos;
201 elems->prep_len = elen;
202 break;
203 case WLAN_EID_PERR:
204 elems->perr = pos;
205 elems->perr_len = elen;
206 break;
207 default:
208 break;
209 }
210
211 left -= elen;
212 pos += elen;
213 }
214 }
215
216
217 static int ecw2cw(int ecw)
218 {
219 return (1 << ecw) - 1;
220 }
221
222
223 static void ieee80211_sta_def_wmm_params(struct net_device *dev,
224 struct ieee80211_sta_bss *bss,
225 int ibss)
226 {
227 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
228 struct ieee80211_local *local = sdata->local;
229 int i, have_higher_than_11mbit = 0;
230
231
232 /* cf. IEEE 802.11 9.2.12 */
233 for (i = 0; i < bss->supp_rates_len; i++)
234 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
235 have_higher_than_11mbit = 1;
236
237 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
238 have_higher_than_11mbit)
239 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
240 else
241 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
242
243
244 if (local->ops->conf_tx) {
245 struct ieee80211_tx_queue_params qparam;
246
247 memset(&qparam, 0, sizeof(qparam));
248
249 qparam.aifs = 2;
250
251 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
252 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
253 qparam.cw_min = 31;
254 else
255 qparam.cw_min = 15;
256
257 qparam.cw_max = 1023;
258 qparam.txop = 0;
259
260 for (i = 0; i < local_to_hw(local)->queues; i++)
261 local->ops->conf_tx(local_to_hw(local), i, &qparam);
262 }
263 }
264
265 static void ieee80211_sta_wmm_params(struct net_device *dev,
266 struct ieee80211_if_sta *ifsta,
267 u8 *wmm_param, size_t wmm_param_len)
268 {
269 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
270 struct ieee80211_tx_queue_params params;
271 size_t left;
272 int count;
273 u8 *pos;
274
275 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
276 return;
277
278 if (!wmm_param)
279 return;
280
281 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
282 return;
283 count = wmm_param[6] & 0x0f;
284 if (count == ifsta->wmm_last_param_set)
285 return;
286 ifsta->wmm_last_param_set = count;
287
288 pos = wmm_param + 8;
289 left = wmm_param_len - 8;
290
291 memset(&params, 0, sizeof(params));
292
293 if (!local->ops->conf_tx)
294 return;
295
296 local->wmm_acm = 0;
297 for (; left >= 4; left -= 4, pos += 4) {
298 int aci = (pos[0] >> 5) & 0x03;
299 int acm = (pos[0] >> 4) & 0x01;
300 int queue;
301
302 switch (aci) {
303 case 1:
304 queue = 3;
305 if (acm)
306 local->wmm_acm |= BIT(0) | BIT(3);
307 break;
308 case 2:
309 queue = 1;
310 if (acm)
311 local->wmm_acm |= BIT(4) | BIT(5);
312 break;
313 case 3:
314 queue = 0;
315 if (acm)
316 local->wmm_acm |= BIT(6) | BIT(7);
317 break;
318 case 0:
319 default:
320 queue = 2;
321 if (acm)
322 local->wmm_acm |= BIT(1) | BIT(2);
323 break;
324 }
325
326 params.aifs = pos[0] & 0x0f;
327 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
328 params.cw_min = ecw2cw(pos[1] & 0x0f);
329 params.txop = pos[2] | (pos[3] << 8);
330 #ifdef CONFIG_MAC80211_DEBUG
331 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
332 "cWmin=%d cWmax=%d txop=%d\n",
333 dev->name, queue, aci, acm, params.aifs, params.cw_min,
334 params.cw_max, params.txop);
335 #endif
336 /* TODO: handle ACM (block TX, fallback to next lowest allowed
337 * AC for now) */
338 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
339 printk(KERN_DEBUG "%s: failed to set TX queue "
340 "parameters for queue %d\n", dev->name, queue);
341 }
342 }
343 }
344
345 static u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
346 bool use_protection,
347 bool use_short_preamble)
348 {
349 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
350 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
351 DECLARE_MAC_BUF(mac);
352 u32 changed = 0;
353
354 if (use_protection != bss_conf->use_cts_prot) {
355 if (net_ratelimit()) {
356 printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
357 "%s)\n",
358 sdata->dev->name,
359 use_protection ? "enabled" : "disabled",
360 print_mac(mac, ifsta->bssid));
361 }
362 bss_conf->use_cts_prot = use_protection;
363 changed |= BSS_CHANGED_ERP_CTS_PROT;
364 }
365
366 if (use_short_preamble != bss_conf->use_short_preamble) {
367 if (net_ratelimit()) {
368 printk(KERN_DEBUG "%s: switched to %s barker preamble"
369 " (BSSID=%s)\n",
370 sdata->dev->name,
371 use_short_preamble ? "short" : "long",
372 print_mac(mac, ifsta->bssid));
373 }
374 bss_conf->use_short_preamble = use_short_preamble;
375 changed |= BSS_CHANGED_ERP_PREAMBLE;
376 }
377
378 return changed;
379 }
380
381 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
382 u8 erp_value)
383 {
384 bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
385 bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
386
387 return ieee80211_handle_protect_preamb(sdata,
388 use_protection, use_short_preamble);
389 }
390
391 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
392 struct ieee80211_sta_bss *bss)
393 {
394 u32 changed = 0;
395
396 if (bss->has_erp_value)
397 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
398 else {
399 u16 capab = bss->capability;
400 changed |= ieee80211_handle_protect_preamb(sdata, false,
401 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
402 }
403
404 return changed;
405 }
406
407 int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
408 struct ieee80211_ht_info *ht_info)
409 {
410
411 if (ht_info == NULL)
412 return -EINVAL;
413
414 memset(ht_info, 0, sizeof(*ht_info));
415
416 if (ht_cap_ie) {
417 u8 ampdu_info = ht_cap_ie->ampdu_params_info;
418
419 ht_info->ht_supported = 1;
420 ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
421 ht_info->ampdu_factor =
422 ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
423 ht_info->ampdu_density =
424 (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
425 memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
426 } else
427 ht_info->ht_supported = 0;
428
429 return 0;
430 }
431
432 int ieee80211_ht_addt_info_ie_to_ht_bss_info(
433 struct ieee80211_ht_addt_info *ht_add_info_ie,
434 struct ieee80211_ht_bss_info *bss_info)
435 {
436 if (bss_info == NULL)
437 return -EINVAL;
438
439 memset(bss_info, 0, sizeof(*bss_info));
440
441 if (ht_add_info_ie) {
442 u16 op_mode;
443 op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);
444
445 bss_info->primary_channel = ht_add_info_ie->control_chan;
446 bss_info->bss_cap = ht_add_info_ie->ht_param;
447 bss_info->bss_op_mode = (u8)(op_mode & 0xff);
448 }
449
450 return 0;
451 }
452
453 static void ieee80211_sta_send_associnfo(struct net_device *dev,
454 struct ieee80211_if_sta *ifsta)
455 {
456 char *buf;
457 size_t len;
458 int i;
459 union iwreq_data wrqu;
460
461 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
462 return;
463
464 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
465 ifsta->assocresp_ies_len), GFP_KERNEL);
466 if (!buf)
467 return;
468
469 len = sprintf(buf, "ASSOCINFO(");
470 if (ifsta->assocreq_ies) {
471 len += sprintf(buf + len, "ReqIEs=");
472 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
473 len += sprintf(buf + len, "%02x",
474 ifsta->assocreq_ies[i]);
475 }
476 }
477 if (ifsta->assocresp_ies) {
478 if (ifsta->assocreq_ies)
479 len += sprintf(buf + len, " ");
480 len += sprintf(buf + len, "RespIEs=");
481 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
482 len += sprintf(buf + len, "%02x",
483 ifsta->assocresp_ies[i]);
484 }
485 }
486 len += sprintf(buf + len, ")");
487
488 if (len > IW_CUSTOM_MAX) {
489 len = sprintf(buf, "ASSOCRESPIE=");
490 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
491 len += sprintf(buf + len, "%02x",
492 ifsta->assocresp_ies[i]);
493 }
494 }
495
496 memset(&wrqu, 0, sizeof(wrqu));
497 wrqu.data.length = len;
498 wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
499
500 kfree(buf);
501 }
502
503
504 static void ieee80211_set_associated(struct net_device *dev,
505 struct ieee80211_if_sta *ifsta,
506 bool assoc)
507 {
508 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
509 struct ieee80211_local *local = sdata->local;
510 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
511 union iwreq_data wrqu;
512 u32 changed = BSS_CHANGED_ASSOC;
513
514 if (assoc) {
515 struct ieee80211_sta_bss *bss;
516
517 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
518
519 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
520 return;
521
522 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
523 conf->channel->center_freq,
524 ifsta->ssid, ifsta->ssid_len);
525 if (bss) {
526 /* set timing information */
527 sdata->bss_conf.beacon_int = bss->beacon_int;
528 sdata->bss_conf.timestamp = bss->timestamp;
529
530 changed |= ieee80211_handle_bss_capability(sdata, bss);
531
532 ieee80211_rx_bss_put(dev, bss);
533 }
534
535 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
536 changed |= BSS_CHANGED_HT;
537 sdata->bss_conf.assoc_ht = 1;
538 sdata->bss_conf.ht_conf = &conf->ht_conf;
539 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
540 }
541
542 netif_carrier_on(dev);
543 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
544 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
545 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
546 ieee80211_sta_send_associnfo(dev, ifsta);
547 } else {
548 ieee80211_sta_tear_down_BA_sessions(dev, ifsta->bssid);
549 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
550 netif_carrier_off(dev);
551 ieee80211_reset_erp_info(dev);
552
553 sdata->bss_conf.assoc_ht = 0;
554 sdata->bss_conf.ht_conf = NULL;
555 sdata->bss_conf.ht_bss_conf = NULL;
556
557 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
558 }
559 ifsta->last_probe = jiffies;
560 ieee80211_led_assoc(local, assoc);
561
562 sdata->bss_conf.assoc = assoc;
563 ieee80211_bss_info_change_notify(sdata, changed);
564 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
565 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
566 }
567
568 static void ieee80211_set_disassoc(struct net_device *dev,
569 struct ieee80211_if_sta *ifsta, int deauth)
570 {
571 if (deauth)
572 ifsta->auth_tries = 0;
573 ifsta->assoc_tries = 0;
574 ieee80211_set_associated(dev, ifsta, 0);
575 }
576
577 void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
578 int encrypt)
579 {
580 struct ieee80211_sub_if_data *sdata;
581 struct ieee80211_tx_packet_data *pkt_data;
582
583 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
584 skb->dev = sdata->local->mdev;
585 skb_set_mac_header(skb, 0);
586 skb_set_network_header(skb, 0);
587 skb_set_transport_header(skb, 0);
588
589 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
590 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
591 pkt_data->ifindex = sdata->dev->ifindex;
592 if (!encrypt)
593 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
594
595 dev_queue_xmit(skb);
596 }
597
598
599 static void ieee80211_send_auth(struct net_device *dev,
600 struct ieee80211_if_sta *ifsta,
601 int transaction, u8 *extra, size_t extra_len,
602 int encrypt)
603 {
604 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
605 struct sk_buff *skb;
606 struct ieee80211_mgmt *mgmt;
607
608 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
609 sizeof(*mgmt) + 6 + extra_len);
610 if (!skb) {
611 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
612 "frame\n", dev->name);
613 return;
614 }
615 skb_reserve(skb, local->hw.extra_tx_headroom);
616
617 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
618 memset(mgmt, 0, 24 + 6);
619 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
620 IEEE80211_STYPE_AUTH);
621 if (encrypt)
622 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
623 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
624 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
625 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
626 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
627 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
628 ifsta->auth_transaction = transaction + 1;
629 mgmt->u.auth.status_code = cpu_to_le16(0);
630 if (extra)
631 memcpy(skb_put(skb, extra_len), extra, extra_len);
632
633 ieee80211_sta_tx(dev, skb, encrypt);
634 }
635
636
637 static void ieee80211_authenticate(struct net_device *dev,
638 struct ieee80211_if_sta *ifsta)
639 {
640 DECLARE_MAC_BUF(mac);
641
642 ifsta->auth_tries++;
643 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
644 printk(KERN_DEBUG "%s: authentication with AP %s"
645 " timed out\n",
646 dev->name, print_mac(mac, ifsta->bssid));
647 ifsta->state = IEEE80211_DISABLED;
648 return;
649 }
650
651 ifsta->state = IEEE80211_AUTHENTICATE;
652 printk(KERN_DEBUG "%s: authenticate with AP %s\n",
653 dev->name, print_mac(mac, ifsta->bssid));
654
655 ieee80211_send_auth(dev, ifsta, 1, NULL, 0, 0);
656
657 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
658 }
659
660
661 static void ieee80211_send_assoc(struct net_device *dev,
662 struct ieee80211_if_sta *ifsta)
663 {
664 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
665 struct sk_buff *skb;
666 struct ieee80211_mgmt *mgmt;
667 u8 *pos, *ies;
668 int i, len;
669 u16 capab;
670 struct ieee80211_sta_bss *bss;
671 int wmm = 0;
672 struct ieee80211_supported_band *sband;
673
674 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
675 sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
676 ifsta->ssid_len);
677 if (!skb) {
678 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
679 "frame\n", dev->name);
680 return;
681 }
682 skb_reserve(skb, local->hw.extra_tx_headroom);
683
684 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
685
686 capab = ifsta->capab;
687
688 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
689 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
690 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
691 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
692 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
693 }
694
695 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
696 local->hw.conf.channel->center_freq,
697 ifsta->ssid, ifsta->ssid_len);
698 if (bss) {
699 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
700 capab |= WLAN_CAPABILITY_PRIVACY;
701 if (bss->wmm_ie)
702 wmm = 1;
703 ieee80211_rx_bss_put(dev, bss);
704 }
705
706 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
707 memset(mgmt, 0, 24);
708 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
709 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
710 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
711
712 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
713 skb_put(skb, 10);
714 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
715 IEEE80211_STYPE_REASSOC_REQ);
716 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
717 mgmt->u.reassoc_req.listen_interval = cpu_to_le16(1);
718 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
719 ETH_ALEN);
720 } else {
721 skb_put(skb, 4);
722 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
723 IEEE80211_STYPE_ASSOC_REQ);
724 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
725 mgmt->u.assoc_req.listen_interval = cpu_to_le16(1);
726 }
727
728 /* SSID */
729 ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
730 *pos++ = WLAN_EID_SSID;
731 *pos++ = ifsta->ssid_len;
732 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
733
734 len = sband->n_bitrates;
735 if (len > 8)
736 len = 8;
737 pos = skb_put(skb, len + 2);
738 *pos++ = WLAN_EID_SUPP_RATES;
739 *pos++ = len;
740 for (i = 0; i < len; i++) {
741 int rate = sband->bitrates[i].bitrate;
742 *pos++ = (u8) (rate / 5);
743 }
744
745 if (sband->n_bitrates > len) {
746 pos = skb_put(skb, sband->n_bitrates - len + 2);
747 *pos++ = WLAN_EID_EXT_SUPP_RATES;
748 *pos++ = sband->n_bitrates - len;
749 for (i = len; i < sband->n_bitrates; i++) {
750 int rate = sband->bitrates[i].bitrate;
751 *pos++ = (u8) (rate / 5);
752 }
753 }
754
755 if (ifsta->extra_ie) {
756 pos = skb_put(skb, ifsta->extra_ie_len);
757 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
758 }
759
760 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
761 pos = skb_put(skb, 9);
762 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
763 *pos++ = 7; /* len */
764 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
765 *pos++ = 0x50;
766 *pos++ = 0xf2;
767 *pos++ = 2; /* WME */
768 *pos++ = 0; /* WME info */
769 *pos++ = 1; /* WME ver */
770 *pos++ = 0;
771 }
772
773 /* wmm support is a must to HT */
774 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
775 sband->ht_info.ht_supported) {
776 __le16 tmp = cpu_to_le16(sband->ht_info.cap);
777 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
778 *pos++ = WLAN_EID_HT_CAPABILITY;
779 *pos++ = sizeof(struct ieee80211_ht_cap);
780 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
781 memcpy(pos, &tmp, sizeof(u16));
782 pos += sizeof(u16);
783 /* TODO: needs a define here for << 2 */
784 *pos++ = sband->ht_info.ampdu_factor |
785 (sband->ht_info.ampdu_density << 2);
786 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
787 }
788
789 kfree(ifsta->assocreq_ies);
790 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
791 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
792 if (ifsta->assocreq_ies)
793 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
794
795 ieee80211_sta_tx(dev, skb, 0);
796 }
797
798
799 static void ieee80211_send_deauth(struct net_device *dev,
800 struct ieee80211_if_sta *ifsta, u16 reason)
801 {
802 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
803 struct sk_buff *skb;
804 struct ieee80211_mgmt *mgmt;
805
806 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
807 if (!skb) {
808 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
809 "frame\n", dev->name);
810 return;
811 }
812 skb_reserve(skb, local->hw.extra_tx_headroom);
813
814 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
815 memset(mgmt, 0, 24);
816 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
817 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
818 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
819 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
820 IEEE80211_STYPE_DEAUTH);
821 skb_put(skb, 2);
822 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
823
824 ieee80211_sta_tx(dev, skb, 0);
825 }
826
827
828 static void ieee80211_send_disassoc(struct net_device *dev,
829 struct ieee80211_if_sta *ifsta, u16 reason)
830 {
831 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
832 struct sk_buff *skb;
833 struct ieee80211_mgmt *mgmt;
834
835 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
836 if (!skb) {
837 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
838 "frame\n", dev->name);
839 return;
840 }
841 skb_reserve(skb, local->hw.extra_tx_headroom);
842
843 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
844 memset(mgmt, 0, 24);
845 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
846 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
847 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
848 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
849 IEEE80211_STYPE_DISASSOC);
850 skb_put(skb, 2);
851 mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
852
853 ieee80211_sta_tx(dev, skb, 0);
854 }
855
856
857 static int ieee80211_privacy_mismatch(struct net_device *dev,
858 struct ieee80211_if_sta *ifsta)
859 {
860 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
861 struct ieee80211_sta_bss *bss;
862 int bss_privacy;
863 int wep_privacy;
864 int privacy_invoked;
865
866 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
867 return 0;
868
869 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
870 local->hw.conf.channel->center_freq,
871 ifsta->ssid, ifsta->ssid_len);
872 if (!bss)
873 return 0;
874
875 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
876 wep_privacy = !!ieee80211_sta_wep_configured(dev);
877 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
878
879 ieee80211_rx_bss_put(dev, bss);
880
881 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
882 return 0;
883
884 return 1;
885 }
886
887
888 static void ieee80211_associate(struct net_device *dev,
889 struct ieee80211_if_sta *ifsta)
890 {
891 DECLARE_MAC_BUF(mac);
892
893 ifsta->assoc_tries++;
894 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
895 printk(KERN_DEBUG "%s: association with AP %s"
896 " timed out\n",
897 dev->name, print_mac(mac, ifsta->bssid));
898 ifsta->state = IEEE80211_DISABLED;
899 return;
900 }
901
902 ifsta->state = IEEE80211_ASSOCIATE;
903 printk(KERN_DEBUG "%s: associate with AP %s\n",
904 dev->name, print_mac(mac, ifsta->bssid));
905 if (ieee80211_privacy_mismatch(dev, ifsta)) {
906 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
907 "mixed-cell disabled - abort association\n", dev->name);
908 ifsta->state = IEEE80211_DISABLED;
909 return;
910 }
911
912 ieee80211_send_assoc(dev, ifsta);
913
914 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
915 }
916
917
918 static void ieee80211_associated(struct net_device *dev,
919 struct ieee80211_if_sta *ifsta)
920 {
921 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
922 struct sta_info *sta;
923 int disassoc;
924 DECLARE_MAC_BUF(mac);
925
926 /* TODO: start monitoring current AP signal quality and number of
927 * missed beacons. Scan other channels every now and then and search
928 * for better APs. */
929 /* TODO: remove expired BSSes */
930
931 ifsta->state = IEEE80211_ASSOCIATED;
932
933 rcu_read_lock();
934
935 sta = sta_info_get(local, ifsta->bssid);
936 if (!sta) {
937 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
938 dev->name, print_mac(mac, ifsta->bssid));
939 disassoc = 1;
940 } else {
941 disassoc = 0;
942 if (time_after(jiffies,
943 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
944 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
945 printk(KERN_DEBUG "%s: No ProbeResp from "
946 "current AP %s - assume out of "
947 "range\n",
948 dev->name, print_mac(mac, ifsta->bssid));
949 disassoc = 1;
950 sta_info_unlink(&sta);
951 } else
952 ieee80211_send_probe_req(dev, ifsta->bssid,
953 local->scan_ssid,
954 local->scan_ssid_len);
955 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
956 } else {
957 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
958 if (time_after(jiffies, ifsta->last_probe +
959 IEEE80211_PROBE_INTERVAL)) {
960 ifsta->last_probe = jiffies;
961 ieee80211_send_probe_req(dev, ifsta->bssid,
962 ifsta->ssid,
963 ifsta->ssid_len);
964 }
965 }
966 }
967
968 rcu_read_unlock();
969
970 if (disassoc && sta)
971 sta_info_destroy(sta);
972
973 if (disassoc) {
974 ifsta->state = IEEE80211_DISABLED;
975 ieee80211_set_associated(dev, ifsta, 0);
976 } else {
977 mod_timer(&ifsta->timer, jiffies +
978 IEEE80211_MONITORING_INTERVAL);
979 }
980 }
981
982
983 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
984 u8 *ssid, size_t ssid_len)
985 {
986 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
987 struct ieee80211_supported_band *sband;
988 struct sk_buff *skb;
989 struct ieee80211_mgmt *mgmt;
990 u8 *pos, *supp_rates, *esupp_rates = NULL;
991 int i;
992
993 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
994 if (!skb) {
995 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
996 "request\n", dev->name);
997 return;
998 }
999 skb_reserve(skb, local->hw.extra_tx_headroom);
1000
1001 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1002 memset(mgmt, 0, 24);
1003 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1004 IEEE80211_STYPE_PROBE_REQ);
1005 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1006 if (dst) {
1007 memcpy(mgmt->da, dst, ETH_ALEN);
1008 memcpy(mgmt->bssid, dst, ETH_ALEN);
1009 } else {
1010 memset(mgmt->da, 0xff, ETH_ALEN);
1011 memset(mgmt->bssid, 0xff, ETH_ALEN);
1012 }
1013 pos = skb_put(skb, 2 + ssid_len);
1014 *pos++ = WLAN_EID_SSID;
1015 *pos++ = ssid_len;
1016 memcpy(pos, ssid, ssid_len);
1017
1018 supp_rates = skb_put(skb, 2);
1019 supp_rates[0] = WLAN_EID_SUPP_RATES;
1020 supp_rates[1] = 0;
1021 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1022
1023 for (i = 0; i < sband->n_bitrates; i++) {
1024 struct ieee80211_rate *rate = &sband->bitrates[i];
1025 if (esupp_rates) {
1026 pos = skb_put(skb, 1);
1027 esupp_rates[1]++;
1028 } else if (supp_rates[1] == 8) {
1029 esupp_rates = skb_put(skb, 3);
1030 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
1031 esupp_rates[1] = 1;
1032 pos = &esupp_rates[2];
1033 } else {
1034 pos = skb_put(skb, 1);
1035 supp_rates[1]++;
1036 }
1037 *pos = rate->bitrate / 5;
1038 }
1039
1040 ieee80211_sta_tx(dev, skb, 0);
1041 }
1042
1043
1044 static int ieee80211_sta_wep_configured(struct net_device *dev)
1045 {
1046 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1047 if (!sdata || !sdata->default_key ||
1048 sdata->default_key->conf.alg != ALG_WEP)
1049 return 0;
1050 return 1;
1051 }
1052
1053
1054 static void ieee80211_auth_completed(struct net_device *dev,
1055 struct ieee80211_if_sta *ifsta)
1056 {
1057 printk(KERN_DEBUG "%s: authenticated\n", dev->name);
1058 ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1059 ieee80211_associate(dev, ifsta);
1060 }
1061
1062
1063 static void ieee80211_auth_challenge(struct net_device *dev,
1064 struct ieee80211_if_sta *ifsta,
1065 struct ieee80211_mgmt *mgmt,
1066 size_t len)
1067 {
1068 u8 *pos;
1069 struct ieee802_11_elems elems;
1070
1071 printk(KERN_DEBUG "%s: replying to auth challenge\n", dev->name);
1072 pos = mgmt->u.auth.variable;
1073 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1074 if (!elems.challenge) {
1075 printk(KERN_DEBUG "%s: no challenge IE in shared key auth "
1076 "frame\n", dev->name);
1077 return;
1078 }
1079 ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
1080 elems.challenge_len + 2, 1);
1081 }
1082
1083 static void ieee80211_send_addba_resp(struct net_device *dev, u8 *da, u16 tid,
1084 u8 dialog_token, u16 status, u16 policy,
1085 u16 buf_size, u16 timeout)
1086 {
1087 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1088 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1089 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1090 struct sk_buff *skb;
1091 struct ieee80211_mgmt *mgmt;
1092 u16 capab;
1093
1094 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1095
1096 if (!skb) {
1097 printk(KERN_DEBUG "%s: failed to allocate buffer "
1098 "for addba resp frame\n", dev->name);
1099 return;
1100 }
1101
1102 skb_reserve(skb, local->hw.extra_tx_headroom);
1103 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1104 memset(mgmt, 0, 24);
1105 memcpy(mgmt->da, da, ETH_ALEN);
1106 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1107 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1108 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1109 else
1110 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1111 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1112 IEEE80211_STYPE_ACTION);
1113
1114 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
1115 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1116 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
1117 mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
1118
1119 capab = (u16)(policy << 1); /* bit 1 aggregation policy */
1120 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1121 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
1122
1123 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
1124 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
1125 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
1126
1127 ieee80211_sta_tx(dev, skb, 0);
1128
1129 return;
1130 }
1131
1132 void ieee80211_send_addba_request(struct net_device *dev, const u8 *da,
1133 u16 tid, u8 dialog_token, u16 start_seq_num,
1134 u16 agg_size, u16 timeout)
1135 {
1136 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1137 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1138 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1139 struct sk_buff *skb;
1140 struct ieee80211_mgmt *mgmt;
1141 u16 capab;
1142
1143 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1144
1145 if (!skb) {
1146 printk(KERN_ERR "%s: failed to allocate buffer "
1147 "for addba request frame\n", dev->name);
1148 return;
1149 }
1150 skb_reserve(skb, local->hw.extra_tx_headroom);
1151 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1152 memset(mgmt, 0, 24);
1153 memcpy(mgmt->da, da, ETH_ALEN);
1154 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1155 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1156 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1157 else
1158 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1159
1160 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1161 IEEE80211_STYPE_ACTION);
1162
1163 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
1164
1165 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1166 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
1167
1168 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
1169 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
1170 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
1171 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
1172
1173 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
1174
1175 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
1176 mgmt->u.action.u.addba_req.start_seq_num =
1177 cpu_to_le16(start_seq_num << 4);
1178
1179 ieee80211_sta_tx(dev, skb, 0);
1180 }
1181
1182 static void ieee80211_sta_process_addba_request(struct net_device *dev,
1183 struct ieee80211_mgmt *mgmt,
1184 size_t len)
1185 {
1186 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1187 struct ieee80211_hw *hw = &local->hw;
1188 struct ieee80211_conf *conf = &hw->conf;
1189 struct sta_info *sta;
1190 struct tid_ampdu_rx *tid_agg_rx;
1191 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
1192 u8 dialog_token;
1193 int ret = -EOPNOTSUPP;
1194 DECLARE_MAC_BUF(mac);
1195
1196 rcu_read_lock();
1197
1198 sta = sta_info_get(local, mgmt->sa);
1199 if (!sta) {
1200 rcu_read_unlock();
1201 return;
1202 }
1203
1204 /* extract session parameters from addba request frame */
1205 dialog_token = mgmt->u.action.u.addba_req.dialog_token;
1206 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
1207 start_seq_num =
1208 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
1209
1210 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
1211 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
1212 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1213 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
1214
1215 status = WLAN_STATUS_REQUEST_DECLINED;
1216
1217 /* sanity check for incoming parameters:
1218 * check if configuration can support the BA policy
1219 * and if buffer size does not exceeds max value */
1220 if (((ba_policy != 1)
1221 && (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA)))
1222 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
1223 status = WLAN_STATUS_INVALID_QOS_PARAM;
1224 #ifdef CONFIG_MAC80211_HT_DEBUG
1225 if (net_ratelimit())
1226 printk(KERN_DEBUG "AddBA Req with bad params from "
1227 "%s on tid %u. policy %d, buffer size %d\n",
1228 print_mac(mac, mgmt->sa), tid, ba_policy,
1229 buf_size);
1230 #endif /* CONFIG_MAC80211_HT_DEBUG */
1231 goto end_no_lock;
1232 }
1233 /* determine default buffer size */
1234 if (buf_size == 0) {
1235 struct ieee80211_supported_band *sband;
1236
1237 sband = local->hw.wiphy->bands[conf->channel->band];
1238 buf_size = IEEE80211_MIN_AMPDU_BUF;
1239 buf_size = buf_size << sband->ht_info.ampdu_factor;
1240 }
1241
1242
1243 /* examine state machine */
1244 spin_lock_bh(&sta->lock);
1245
1246 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
1247 #ifdef CONFIG_MAC80211_HT_DEBUG
1248 if (net_ratelimit())
1249 printk(KERN_DEBUG "unexpected AddBA Req from "
1250 "%s on tid %u\n",
1251 print_mac(mac, mgmt->sa), tid);
1252 #endif /* CONFIG_MAC80211_HT_DEBUG */
1253 goto end;
1254 }
1255
1256 /* prepare A-MPDU MLME for Rx aggregation */
1257 sta->ampdu_mlme.tid_rx[tid] =
1258 kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
1259 if (!sta->ampdu_mlme.tid_rx[tid]) {
1260 if (net_ratelimit())
1261 printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
1262 tid);
1263 goto end;
1264 }
1265 /* rx timer */
1266 sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
1267 sta_rx_agg_session_timer_expired;
1268 sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
1269 (unsigned long)&sta->timer_to_tid[tid];
1270 init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1271
1272 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
1273
1274 /* prepare reordering buffer */
1275 tid_agg_rx->reorder_buf =
1276 kmalloc(buf_size * sizeof(struct sk_buf *), GFP_ATOMIC);
1277 if (!tid_agg_rx->reorder_buf) {
1278 if (net_ratelimit())
1279 printk(KERN_ERR "can not allocate reordering buffer "
1280 "to tid %d\n", tid);
1281 kfree(sta->ampdu_mlme.tid_rx[tid]);
1282 goto end;
1283 }
1284 memset(tid_agg_rx->reorder_buf, 0,
1285 buf_size * sizeof(struct sk_buf *));
1286
1287 if (local->ops->ampdu_action)
1288 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
1289 sta->addr, tid, &start_seq_num);
1290 #ifdef CONFIG_MAC80211_HT_DEBUG
1291 printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
1292 #endif /* CONFIG_MAC80211_HT_DEBUG */
1293
1294 if (ret) {
1295 kfree(tid_agg_rx->reorder_buf);
1296 kfree(tid_agg_rx);
1297 sta->ampdu_mlme.tid_rx[tid] = NULL;
1298 goto end;
1299 }
1300
1301 /* change state and send addba resp */
1302 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
1303 tid_agg_rx->dialog_token = dialog_token;
1304 tid_agg_rx->ssn = start_seq_num;
1305 tid_agg_rx->head_seq_num = start_seq_num;
1306 tid_agg_rx->buf_size = buf_size;
1307 tid_agg_rx->timeout = timeout;
1308 tid_agg_rx->stored_mpdu_num = 0;
1309 status = WLAN_STATUS_SUCCESS;
1310 end:
1311 spin_unlock_bh(&sta->lock);
1312
1313 end_no_lock:
1314 ieee80211_send_addba_resp(sta->sdata->dev, sta->addr, tid,
1315 dialog_token, status, 1, buf_size, timeout);
1316 rcu_read_unlock();
1317 }
1318
1319 static void ieee80211_sta_process_addba_resp(struct net_device *dev,
1320 struct ieee80211_mgmt *mgmt,
1321 size_t len)
1322 {
1323 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1324 struct ieee80211_hw *hw = &local->hw;
1325 struct sta_info *sta;
1326 u16 capab;
1327 u16 tid;
1328 u8 *state;
1329
1330 rcu_read_lock();
1331
1332 sta = sta_info_get(local, mgmt->sa);
1333 if (!sta) {
1334 rcu_read_unlock();
1335 return;
1336 }
1337
1338 capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
1339 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1340
1341 state = &sta->ampdu_mlme.tid_state_tx[tid];
1342
1343 spin_lock_bh(&sta->lock);
1344
1345 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1346 spin_unlock_bh(&sta->lock);
1347 printk(KERN_DEBUG "state not HT_ADDBA_REQUESTED_MSK:"
1348 "%d\n", *state);
1349 goto addba_resp_exit;
1350 }
1351
1352 if (mgmt->u.action.u.addba_resp.dialog_token !=
1353 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
1354 spin_unlock_bh(&sta->lock);
1355 #ifdef CONFIG_MAC80211_HT_DEBUG
1356 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
1357 #endif /* CONFIG_MAC80211_HT_DEBUG */
1358 goto addba_resp_exit;
1359 }
1360
1361 del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
1362 #ifdef CONFIG_MAC80211_HT_DEBUG
1363 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
1364 #endif /* CONFIG_MAC80211_HT_DEBUG */
1365 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
1366 == WLAN_STATUS_SUCCESS) {
1367 if (*state & HT_ADDBA_RECEIVED_MSK)
1368 printk(KERN_DEBUG "double addBA response\n");
1369
1370 *state |= HT_ADDBA_RECEIVED_MSK;
1371 sta->ampdu_mlme.addba_req_num[tid] = 0;
1372
1373 if (*state == HT_AGG_STATE_OPERATIONAL) {
1374 printk(KERN_DEBUG "Aggregation on for tid %d \n", tid);
1375 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
1376 }
1377
1378 spin_unlock_bh(&sta->lock);
1379 printk(KERN_DEBUG "recipient accepted agg: tid %d \n", tid);
1380 } else {
1381 printk(KERN_DEBUG "recipient rejected agg: tid %d \n", tid);
1382
1383 sta->ampdu_mlme.addba_req_num[tid]++;
1384 /* this will allow the state check in stop_BA_session */
1385 *state = HT_AGG_STATE_OPERATIONAL;
1386 spin_unlock_bh(&sta->lock);
1387 ieee80211_stop_tx_ba_session(hw, sta->addr, tid,
1388 WLAN_BACK_INITIATOR);
1389 }
1390
1391 addba_resp_exit:
1392 rcu_read_unlock();
1393 }
1394
1395 void ieee80211_send_delba(struct net_device *dev, const u8 *da, u16 tid,
1396 u16 initiator, u16 reason_code)
1397 {
1398 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1399 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1400 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1401 struct sk_buff *skb;
1402 struct ieee80211_mgmt *mgmt;
1403 u16 params;
1404
1405 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1406
1407 if (!skb) {
1408 printk(KERN_ERR "%s: failed to allocate buffer "
1409 "for delba frame\n", dev->name);
1410 return;
1411 }
1412
1413 skb_reserve(skb, local->hw.extra_tx_headroom);
1414 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1415 memset(mgmt, 0, 24);
1416 memcpy(mgmt->da, da, ETH_ALEN);
1417 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1418 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1419 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1420 else
1421 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1422 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1423 IEEE80211_STYPE_ACTION);
1424
1425 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
1426
1427 mgmt->u.action.category = WLAN_CATEGORY_BACK;
1428 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
1429 params = (u16)(initiator << 11); /* bit 11 initiator */
1430 params |= (u16)(tid << 12); /* bit 15:12 TID number */
1431
1432 mgmt->u.action.u.delba.params = cpu_to_le16(params);
1433 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
1434
1435 ieee80211_sta_tx(dev, skb, 0);
1436 }
1437
1438 void ieee80211_sta_stop_rx_ba_session(struct net_device *dev, u8 *ra, u16 tid,
1439 u16 initiator, u16 reason)
1440 {
1441 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1442 struct ieee80211_hw *hw = &local->hw;
1443 struct sta_info *sta;
1444 int ret, i;
1445 DECLARE_MAC_BUF(mac);
1446
1447 rcu_read_lock();
1448
1449 sta = sta_info_get(local, ra);
1450 if (!sta) {
1451 rcu_read_unlock();
1452 return;
1453 }
1454
1455 /* check if TID is in operational state */
1456 spin_lock_bh(&sta->lock);
1457 if (sta->ampdu_mlme.tid_state_rx[tid]
1458 != HT_AGG_STATE_OPERATIONAL) {
1459 spin_unlock_bh(&sta->lock);
1460 rcu_read_unlock();
1461 return;
1462 }
1463 sta->ampdu_mlme.tid_state_rx[tid] =
1464 HT_AGG_STATE_REQ_STOP_BA_MSK |
1465 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
1466 spin_unlock_bh(&sta->lock);
1467
1468 /* stop HW Rx aggregation. ampdu_action existence
1469 * already verified in session init so we add the BUG_ON */
1470 BUG_ON(!local->ops->ampdu_action);
1471
1472 #ifdef CONFIG_MAC80211_HT_DEBUG
1473 printk(KERN_DEBUG "Rx BA session stop requested for %s tid %u\n",
1474 print_mac(mac, ra), tid);
1475 #endif /* CONFIG_MAC80211_HT_DEBUG */
1476
1477 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
1478 ra, tid, NULL);
1479 if (ret)
1480 printk(KERN_DEBUG "HW problem - can not stop rx "
1481 "aggergation for tid %d\n", tid);
1482
1483 /* shutdown timer has not expired */
1484 if (initiator != WLAN_BACK_TIMER)
1485 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1486
1487 /* check if this is a self generated aggregation halt */
1488 if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
1489 ieee80211_send_delba(dev, ra, tid, 0, reason);
1490
1491 /* free the reordering buffer */
1492 for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
1493 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
1494 /* release the reordered frames */
1495 dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
1496 sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
1497 sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
1498 }
1499 }
1500 /* free resources */
1501 kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
1502 kfree(sta->ampdu_mlme.tid_rx[tid]);
1503 sta->ampdu_mlme.tid_rx[tid] = NULL;
1504 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
1505
1506 rcu_read_unlock();
1507 }
1508
1509
1510 static void ieee80211_sta_process_delba(struct net_device *dev,
1511 struct ieee80211_mgmt *mgmt, size_t len)
1512 {
1513 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1514 struct sta_info *sta;
1515 u16 tid, params;
1516 u16 initiator;
1517 DECLARE_MAC_BUF(mac);
1518
1519 rcu_read_lock();
1520
1521 sta = sta_info_get(local, mgmt->sa);
1522 if (!sta) {
1523 rcu_read_unlock();
1524 return;
1525 }
1526
1527 params = le16_to_cpu(mgmt->u.action.u.delba.params);
1528 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
1529 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
1530
1531 #ifdef CONFIG_MAC80211_HT_DEBUG
1532 if (net_ratelimit())
1533 printk(KERN_DEBUG "delba from %s (%s) tid %d reason code %d\n",
1534 print_mac(mac, mgmt->sa),
1535 initiator ? "initiator" : "recipient", tid,
1536 mgmt->u.action.u.delba.reason_code);
1537 #endif /* CONFIG_MAC80211_HT_DEBUG */
1538
1539 if (initiator == WLAN_BACK_INITIATOR)
1540 ieee80211_sta_stop_rx_ba_session(dev, sta->addr, tid,
1541 WLAN_BACK_INITIATOR, 0);
1542 else { /* WLAN_BACK_RECIPIENT */
1543 spin_lock_bh(&sta->lock);
1544 sta->ampdu_mlme.tid_state_tx[tid] =
1545 HT_AGG_STATE_OPERATIONAL;
1546 spin_unlock_bh(&sta->lock);
1547 ieee80211_stop_tx_ba_session(&local->hw, sta->addr, tid,
1548 WLAN_BACK_RECIPIENT);
1549 }
1550 rcu_read_unlock();
1551 }
1552
1553 /*
1554 * After sending add Block Ack request we activated a timer until
1555 * add Block Ack response will arrive from the recipient.
1556 * If this timer expires sta_addba_resp_timer_expired will be executed.
1557 */
1558 void sta_addba_resp_timer_expired(unsigned long data)
1559 {
1560 /* not an elegant detour, but there is no choice as the timer passes
1561 * only one argument, and both sta_info and TID are needed, so init
1562 * flow in sta_info_create gives the TID as data, while the timer_to_id
1563 * array gives the sta through container_of */
1564 u16 tid = *(int *)data;
1565 struct sta_info *temp_sta = container_of((void *)data,
1566 struct sta_info, timer_to_tid[tid]);
1567
1568 struct ieee80211_local *local = temp_sta->local;
1569 struct ieee80211_hw *hw = &local->hw;
1570 struct sta_info *sta;
1571 u8 *state;
1572
1573 rcu_read_lock();
1574
1575 sta = sta_info_get(local, temp_sta->addr);
1576 if (!sta) {
1577 rcu_read_unlock();
1578 return;
1579 }
1580
1581 state = &sta->ampdu_mlme.tid_state_tx[tid];
1582 /* check if the TID waits for addBA response */
1583 spin_lock_bh(&sta->lock);
1584 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1585 spin_unlock_bh(&sta->lock);
1586 *state = HT_AGG_STATE_IDLE;
1587 printk(KERN_DEBUG "timer expired on tid %d but we are not "
1588 "expecting addBA response there", tid);
1589 goto timer_expired_exit;
1590 }
1591
1592 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
1593
1594 /* go through the state check in stop_BA_session */
1595 *state = HT_AGG_STATE_OPERATIONAL;
1596 spin_unlock_bh(&sta->lock);
1597 ieee80211_stop_tx_ba_session(hw, temp_sta->addr, tid,
1598 WLAN_BACK_INITIATOR);
1599
1600 timer_expired_exit:
1601 rcu_read_unlock();
1602 }
1603
1604 /*
1605 * After accepting the AddBA Request we activated a timer,
1606 * resetting it after each frame that arrives from the originator.
1607 * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
1608 */
1609 static void sta_rx_agg_session_timer_expired(unsigned long data)
1610 {
1611 /* not an elegant detour, but there is no choice as the timer passes
1612 * only one argument, and verious sta_info are needed here, so init
1613 * flow in sta_info_create gives the TID as data, while the timer_to_id
1614 * array gives the sta through container_of */
1615 u8 *ptid = (u8 *)data;
1616 u8 *timer_to_id = ptid - *ptid;
1617 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
1618 timer_to_tid[0]);
1619
1620 printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
1621 ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr,
1622 (u16)*ptid, WLAN_BACK_TIMER,
1623 WLAN_REASON_QSTA_TIMEOUT);
1624 }
1625
1626 void ieee80211_sta_tear_down_BA_sessions(struct net_device *dev, u8 *addr)
1627 {
1628 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1629 int i;
1630
1631 for (i = 0; i < STA_TID_NUM; i++) {
1632 ieee80211_stop_tx_ba_session(&local->hw, addr, i,
1633 WLAN_BACK_INITIATOR);
1634 ieee80211_sta_stop_rx_ba_session(dev, addr, i,
1635 WLAN_BACK_RECIPIENT,
1636 WLAN_REASON_QSTA_LEAVE_QBSS);
1637 }
1638 }
1639
1640 static void ieee80211_rx_mgmt_auth(struct net_device *dev,
1641 struct ieee80211_if_sta *ifsta,
1642 struct ieee80211_mgmt *mgmt,
1643 size_t len)
1644 {
1645 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1646 u16 auth_alg, auth_transaction, status_code;
1647 DECLARE_MAC_BUF(mac);
1648
1649 if (ifsta->state != IEEE80211_AUTHENTICATE &&
1650 sdata->vif.type != IEEE80211_IF_TYPE_IBSS) {
1651 printk(KERN_DEBUG "%s: authentication frame received from "
1652 "%s, but not in authenticate state - ignored\n",
1653 dev->name, print_mac(mac, mgmt->sa));
1654 return;
1655 }
1656
1657 if (len < 24 + 6) {
1658 printk(KERN_DEBUG "%s: too short (%zd) authentication frame "
1659 "received from %s - ignored\n",
1660 dev->name, len, print_mac(mac, mgmt->sa));
1661 return;
1662 }
1663
1664 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1665 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1666 printk(KERN_DEBUG "%s: authentication frame received from "
1667 "unknown AP (SA=%s BSSID=%s) - "
1668 "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1669 print_mac(mac, mgmt->bssid));
1670 return;
1671 }
1672
1673 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1674 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) {
1675 printk(KERN_DEBUG "%s: authentication frame received from "
1676 "unknown BSSID (SA=%s BSSID=%s) - "
1677 "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1678 print_mac(mac, mgmt->bssid));
1679 return;
1680 }
1681
1682 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1683 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1684 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1685
1686 printk(KERN_DEBUG "%s: RX authentication from %s (alg=%d "
1687 "transaction=%d status=%d)\n",
1688 dev->name, print_mac(mac, mgmt->sa), auth_alg,
1689 auth_transaction, status_code);
1690
1691 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1692 /* IEEE 802.11 standard does not require authentication in IBSS
1693 * networks and most implementations do not seem to use it.
1694 * However, try to reply to authentication attempts if someone
1695 * has actually implemented this.
1696 * TODO: Could implement shared key authentication. */
1697 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) {
1698 printk(KERN_DEBUG "%s: unexpected IBSS authentication "
1699 "frame (alg=%d transaction=%d)\n",
1700 dev->name, auth_alg, auth_transaction);
1701 return;
1702 }
1703 ieee80211_send_auth(dev, ifsta, 2, NULL, 0, 0);
1704 }
1705
1706 if (auth_alg != ifsta->auth_alg ||
1707 auth_transaction != ifsta->auth_transaction) {
1708 printk(KERN_DEBUG "%s: unexpected authentication frame "
1709 "(alg=%d transaction=%d)\n",
1710 dev->name, auth_alg, auth_transaction);
1711 return;
1712 }
1713
1714 if (status_code != WLAN_STATUS_SUCCESS) {
1715 printk(KERN_DEBUG "%s: AP denied authentication (auth_alg=%d "
1716 "code=%d)\n", dev->name, ifsta->auth_alg, status_code);
1717 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1718 u8 algs[3];
1719 const int num_algs = ARRAY_SIZE(algs);
1720 int i, pos;
1721 algs[0] = algs[1] = algs[2] = 0xff;
1722 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1723 algs[0] = WLAN_AUTH_OPEN;
1724 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1725 algs[1] = WLAN_AUTH_SHARED_KEY;
1726 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1727 algs[2] = WLAN_AUTH_LEAP;
1728 if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1729 pos = 0;
1730 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1731 pos = 1;
1732 else
1733 pos = 2;
1734 for (i = 0; i < num_algs; i++) {
1735 pos++;
1736 if (pos >= num_algs)
1737 pos = 0;
1738 if (algs[pos] == ifsta->auth_alg ||
1739 algs[pos] == 0xff)
1740 continue;
1741 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1742 !ieee80211_sta_wep_configured(dev))
1743 continue;
1744 ifsta->auth_alg = algs[pos];
1745 printk(KERN_DEBUG "%s: set auth_alg=%d for "
1746 "next try\n",
1747 dev->name, ifsta->auth_alg);
1748 break;
1749 }
1750 }
1751 return;
1752 }
1753
1754 switch (ifsta->auth_alg) {
1755 case WLAN_AUTH_OPEN:
1756 case WLAN_AUTH_LEAP:
1757 ieee80211_auth_completed(dev, ifsta);
1758 break;
1759 case WLAN_AUTH_SHARED_KEY:
1760 if (ifsta->auth_transaction == 4)
1761 ieee80211_auth_completed(dev, ifsta);
1762 else
1763 ieee80211_auth_challenge(dev, ifsta, mgmt, len);
1764 break;
1765 }
1766 }
1767
1768
1769 static void ieee80211_rx_mgmt_deauth(struct net_device *dev,
1770 struct ieee80211_if_sta *ifsta,
1771 struct ieee80211_mgmt *mgmt,
1772 size_t len)
1773 {
1774 u16 reason_code;
1775 DECLARE_MAC_BUF(mac);
1776
1777 if (len < 24 + 2) {
1778 printk(KERN_DEBUG "%s: too short (%zd) deauthentication frame "
1779 "received from %s - ignored\n",
1780 dev->name, len, print_mac(mac, mgmt->sa));
1781 return;
1782 }
1783
1784 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1785 printk(KERN_DEBUG "%s: deauthentication frame received from "
1786 "unknown AP (SA=%s BSSID=%s) - "
1787 "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1788 print_mac(mac, mgmt->bssid));
1789 return;
1790 }
1791
1792 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1793
1794 printk(KERN_DEBUG "%s: RX deauthentication from %s"
1795 " (reason=%d)\n",
1796 dev->name, print_mac(mac, mgmt->sa), reason_code);
1797
1798 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1799 printk(KERN_DEBUG "%s: deauthenticated\n", dev->name);
1800
1801 if (ifsta->state == IEEE80211_AUTHENTICATE ||
1802 ifsta->state == IEEE80211_ASSOCIATE ||
1803 ifsta->state == IEEE80211_ASSOCIATED) {
1804 ifsta->state = IEEE80211_AUTHENTICATE;
1805 mod_timer(&ifsta->timer, jiffies +
1806 IEEE80211_RETRY_AUTH_INTERVAL);
1807 }
1808
1809 ieee80211_set_disassoc(dev, ifsta, 1);
1810 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1811 }
1812
1813
1814 static void ieee80211_rx_mgmt_disassoc(struct net_device *dev,
1815 struct ieee80211_if_sta *ifsta,
1816 struct ieee80211_mgmt *mgmt,
1817 size_t len)
1818 {
1819 u16 reason_code;
1820 DECLARE_MAC_BUF(mac);
1821
1822 if (len < 24 + 2) {
1823 printk(KERN_DEBUG "%s: too short (%zd) disassociation frame "
1824 "received from %s - ignored\n",
1825 dev->name, len, print_mac(mac, mgmt->sa));
1826 return;
1827 }
1828
1829 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1830 printk(KERN_DEBUG "%s: disassociation frame received from "
1831 "unknown AP (SA=%s BSSID=%s) - "
1832 "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1833 print_mac(mac, mgmt->bssid));
1834 return;
1835 }
1836
1837 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1838
1839 printk(KERN_DEBUG "%s: RX disassociation from %s"
1840 " (reason=%d)\n",
1841 dev->name, print_mac(mac, mgmt->sa), reason_code);
1842
1843 if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1844 printk(KERN_DEBUG "%s: disassociated\n", dev->name);
1845
1846 if (ifsta->state == IEEE80211_ASSOCIATED) {
1847 ifsta->state = IEEE80211_ASSOCIATE;
1848 mod_timer(&ifsta->timer, jiffies +
1849 IEEE80211_RETRY_AUTH_INTERVAL);
1850 }
1851
1852 ieee80211_set_disassoc(dev, ifsta, 0);
1853 }
1854
1855
1856 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1857 struct ieee80211_if_sta *ifsta,
1858 struct ieee80211_mgmt *mgmt,
1859 size_t len,
1860 int reassoc)
1861 {
1862 struct ieee80211_local *local = sdata->local;
1863 struct net_device *dev = sdata->dev;
1864 struct ieee80211_supported_band *sband;
1865 struct sta_info *sta;
1866 u64 rates, basic_rates;
1867 u16 capab_info, status_code, aid;
1868 struct ieee802_11_elems elems;
1869 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
1870 u8 *pos;
1871 int i, j;
1872 DECLARE_MAC_BUF(mac);
1873 bool have_higher_than_11mbit = false;
1874
1875 /* AssocResp and ReassocResp have identical structure, so process both
1876 * of them in this function. */
1877
1878 if (ifsta->state != IEEE80211_ASSOCIATE) {
1879 printk(KERN_DEBUG "%s: association frame received from "
1880 "%s, but not in associate state - ignored\n",
1881 dev->name, print_mac(mac, mgmt->sa));
1882 return;
1883 }
1884
1885 if (len < 24 + 6) {
1886 printk(KERN_DEBUG "%s: too short (%zd) association frame "
1887 "received from %s - ignored\n",
1888 dev->name, len, print_mac(mac, mgmt->sa));
1889 return;
1890 }
1891
1892 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1893 printk(KERN_DEBUG "%s: association frame received from "
1894 "unknown AP (SA=%s BSSID=%s) - "
1895 "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1896 print_mac(mac, mgmt->bssid));
1897 return;
1898 }
1899
1900 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1901 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1902 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1903
1904 printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
1905 "status=%d aid=%d)\n",
1906 dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
1907 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1908
1909 if (status_code != WLAN_STATUS_SUCCESS) {
1910 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1911 dev->name, status_code);
1912 /* if this was a reassociation, ensure we try a "full"
1913 * association next time. This works around some broken APs
1914 * which do not correctly reject reassociation requests. */
1915 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1916 return;
1917 }
1918
1919 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1920 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1921 "set\n", dev->name, aid);
1922 aid &= ~(BIT(15) | BIT(14));
1923
1924 pos = mgmt->u.assoc_resp.variable;
1925 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1926
1927 if (!elems.supp_rates) {
1928 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1929 dev->name);
1930 return;
1931 }
1932
1933 printk(KERN_DEBUG "%s: associated\n", dev->name);
1934 ifsta->aid = aid;
1935 ifsta->ap_capab = capab_info;
1936
1937 kfree(ifsta->assocresp_ies);
1938 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1939 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1940 if (ifsta->assocresp_ies)
1941 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1942
1943 rcu_read_lock();
1944
1945 /* Add STA entry for the AP */
1946 sta = sta_info_get(local, ifsta->bssid);
1947 if (!sta) {
1948 struct ieee80211_sta_bss *bss;
1949 int err;
1950
1951 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1952 if (!sta) {
1953 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1954 " the AP\n", dev->name);
1955 rcu_read_unlock();
1956 return;
1957 }
1958 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
1959 local->hw.conf.channel->center_freq,
1960 ifsta->ssid, ifsta->ssid_len);
1961 if (bss) {
1962 sta->last_signal = bss->signal;
1963 sta->last_qual = bss->qual;
1964 sta->last_noise = bss->noise;
1965 ieee80211_rx_bss_put(dev, bss);
1966 }
1967
1968 err = sta_info_insert(sta);
1969 if (err) {
1970 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1971 " the AP (error %d)\n", dev->name, err);
1972 rcu_read_unlock();
1973 return;
1974 }
1975 }
1976
1977 /*
1978 * FIXME: Do we really need to update the sta_info's information here?
1979 * We already know about the AP (we found it in our list) so it
1980 * should already be filled with the right info, no?
1981 * As is stands, all this is racy because typically we assume
1982 * the information that is filled in here (except flags) doesn't
1983 * change while a STA structure is alive. As such, it should move
1984 * to between the sta_info_alloc() and sta_info_insert() above.
1985 */
1986
1987 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1988 WLAN_STA_AUTHORIZED);
1989
1990 rates = 0;
1991 basic_rates = 0;
1992 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1993
1994 for (i = 0; i < elems.supp_rates_len; i++) {
1995 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1996
1997 if (rate > 110)
1998 have_higher_than_11mbit = true;
1999
2000 for (j = 0; j < sband->n_bitrates; j++) {
2001 if (sband->bitrates[j].bitrate == rate)
2002 rates |= BIT(j);
2003 if (elems.supp_rates[i] & 0x80)
2004 basic_rates |= BIT(j);
2005 }
2006 }
2007
2008 for (i = 0; i < elems.ext_supp_rates_len; i++) {
2009 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
2010
2011 if (rate > 110)
2012 have_higher_than_11mbit = true;
2013
2014 for (j = 0; j < sband->n_bitrates; j++) {
2015 if (sband->bitrates[j].bitrate == rate)
2016 rates |= BIT(j);
2017 if (elems.ext_supp_rates[i] & 0x80)
2018 basic_rates |= BIT(j);
2019 }
2020 }
2021
2022 sta->supp_rates[local->hw.conf.channel->band] = rates;
2023 sdata->basic_rates = basic_rates;
2024
2025 /* cf. IEEE 802.11 9.2.12 */
2026 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
2027 have_higher_than_11mbit)
2028 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
2029 else
2030 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
2031
2032 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2033 (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
2034 struct ieee80211_ht_bss_info bss_info;
2035 ieee80211_ht_cap_ie_to_ht_info(
2036 (struct ieee80211_ht_cap *)
2037 elems.ht_cap_elem, &sta->ht_info);
2038 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2039 (struct ieee80211_ht_addt_info *)
2040 elems.ht_info_elem, &bss_info);
2041 ieee80211_handle_ht(local, 1, &sta->ht_info, &bss_info);
2042 }
2043
2044 rate_control_rate_init(sta, local);
2045
2046 if (elems.wmm_param) {
2047 set_sta_flags(sta, WLAN_STA_WME);
2048 rcu_read_unlock();
2049 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
2050 elems.wmm_param_len);
2051 } else
2052 rcu_read_unlock();
2053
2054 /* set AID and assoc capability,
2055 * ieee80211_set_associated() will tell the driver */
2056 bss_conf->aid = aid;
2057 bss_conf->assoc_capability = capab_info;
2058 ieee80211_set_associated(dev, ifsta, 1);
2059
2060 ieee80211_associated(dev, ifsta);
2061 }
2062
2063
2064 /* Caller must hold local->sta_bss_lock */
2065 static void __ieee80211_rx_bss_hash_add(struct net_device *dev,
2066 struct ieee80211_sta_bss *bss)
2067 {
2068 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2069 u8 hash_idx;
2070
2071 if (bss_mesh_cfg(bss))
2072 hash_idx = mesh_id_hash(bss_mesh_id(bss),
2073 bss_mesh_id_len(bss));
2074 else
2075 hash_idx = STA_HASH(bss->bssid);
2076
2077 bss->hnext = local->sta_bss_hash[hash_idx];
2078 local->sta_bss_hash[hash_idx] = bss;
2079 }
2080
2081
2082 /* Caller must hold local->sta_bss_lock */
2083 static void __ieee80211_rx_bss_hash_del(struct net_device *dev,
2084 struct ieee80211_sta_bss *bss)
2085 {
2086 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2087 struct ieee80211_sta_bss *b, *prev = NULL;
2088 b = local->sta_bss_hash[STA_HASH(bss->bssid)];
2089 while (b) {
2090 if (b == bss) {
2091 if (!prev)
2092 local->sta_bss_hash[STA_HASH(bss->bssid)] =
2093 bss->hnext;
2094 else
2095 prev->hnext = bss->hnext;
2096 break;
2097 }
2098 prev = b;
2099 b = b->hnext;
2100 }
2101 }
2102
2103
2104 static struct ieee80211_sta_bss *
2105 ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int freq,
2106 u8 *ssid, u8 ssid_len)
2107 {
2108 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2109 struct ieee80211_sta_bss *bss;
2110
2111 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2112 if (!bss)
2113 return NULL;
2114 atomic_inc(&bss->users);
2115 atomic_inc(&bss->users);
2116 memcpy(bss->bssid, bssid, ETH_ALEN);
2117 bss->freq = freq;
2118 if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
2119 memcpy(bss->ssid, ssid, ssid_len);
2120 bss->ssid_len = ssid_len;
2121 }
2122
2123 spin_lock_bh(&local->sta_bss_lock);
2124 /* TODO: order by RSSI? */
2125 list_add_tail(&bss->list, &local->sta_bss_list);
2126 __ieee80211_rx_bss_hash_add(dev, bss);
2127 spin_unlock_bh(&local->sta_bss_lock);
2128 return bss;
2129 }
2130
2131 static struct ieee80211_sta_bss *
2132 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int freq,
2133 u8 *ssid, u8 ssid_len)
2134 {
2135 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2136 struct ieee80211_sta_bss *bss;
2137
2138 spin_lock_bh(&local->sta_bss_lock);
2139 bss = local->sta_bss_hash[STA_HASH(bssid)];
2140 while (bss) {
2141 if (!bss_mesh_cfg(bss) &&
2142 !memcmp(bss->bssid, bssid, ETH_ALEN) &&
2143 bss->freq == freq &&
2144 bss->ssid_len == ssid_len &&
2145 (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
2146 atomic_inc(&bss->users);
2147 break;
2148 }
2149 bss = bss->hnext;
2150 }
2151 spin_unlock_bh(&local->sta_bss_lock);
2152 return bss;
2153 }
2154
2155 #ifdef CONFIG_MAC80211_MESH
2156 static struct ieee80211_sta_bss *
2157 ieee80211_rx_mesh_bss_get(struct net_device *dev, u8 *mesh_id, int mesh_id_len,
2158 u8 *mesh_cfg, int freq)
2159 {
2160 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2161 struct ieee80211_sta_bss *bss;
2162
2163 spin_lock_bh(&local->sta_bss_lock);
2164 bss = local->sta_bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
2165 while (bss) {
2166 if (bss_mesh_cfg(bss) &&
2167 !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
2168 bss->freq == freq &&
2169 mesh_id_len == bss->mesh_id_len &&
2170 (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
2171 mesh_id_len))) {
2172 atomic_inc(&bss->users);
2173 break;
2174 }
2175 bss = bss->hnext;
2176 }
2177 spin_unlock_bh(&local->sta_bss_lock);
2178 return bss;
2179 }
2180
2181 static struct ieee80211_sta_bss *
2182 ieee80211_rx_mesh_bss_add(struct net_device *dev, u8 *mesh_id, int mesh_id_len,
2183 u8 *mesh_cfg, int mesh_config_len, int freq)
2184 {
2185 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2186 struct ieee80211_sta_bss *bss;
2187
2188 if (mesh_config_len != MESH_CFG_LEN)
2189 return NULL;
2190
2191 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2192 if (!bss)
2193 return NULL;
2194
2195 bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
2196 if (!bss->mesh_cfg) {
2197 kfree(bss);
2198 return NULL;
2199 }
2200
2201 if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
2202 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
2203 if (!bss->mesh_id) {
2204 kfree(bss->mesh_cfg);
2205 kfree(bss);
2206 return NULL;
2207 }
2208 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
2209 }
2210
2211 atomic_inc(&bss->users);
2212 atomic_inc(&bss->users);
2213 memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
2214 bss->mesh_id_len = mesh_id_len;
2215 bss->freq = freq;
2216 spin_lock_bh(&local->sta_bss_lock);
2217 /* TODO: order by RSSI? */
2218 list_add_tail(&bss->list, &local->sta_bss_list);
2219 __ieee80211_rx_bss_hash_add(dev, bss);
2220 spin_unlock_bh(&local->sta_bss_lock);
2221 return bss;
2222 }
2223 #endif
2224
2225 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
2226 {
2227 kfree(bss->wpa_ie);
2228 kfree(bss->rsn_ie);
2229 kfree(bss->wmm_ie);
2230 kfree(bss->ht_ie);
2231 kfree(bss_mesh_id(bss));
2232 kfree(bss_mesh_cfg(bss));
2233 kfree(bss);
2234 }
2235
2236
2237 static void ieee80211_rx_bss_put(struct net_device *dev,
2238 struct ieee80211_sta_bss *bss)
2239 {
2240 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2241
2242 local_bh_disable();
2243 if (!atomic_dec_and_lock(&bss->users, &local->sta_bss_lock)) {
2244 local_bh_enable();
2245 return;
2246 }
2247
2248 __ieee80211_rx_bss_hash_del(dev, bss);
2249 list_del(&bss->list);
2250 spin_unlock_bh(&local->sta_bss_lock);
2251 ieee80211_rx_bss_free(bss);
2252 }
2253
2254
2255 void ieee80211_rx_bss_list_init(struct net_device *dev)
2256 {
2257 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2258 spin_lock_init(&local->sta_bss_lock);
2259 INIT_LIST_HEAD(&local->sta_bss_list);
2260 }
2261
2262
2263 void ieee80211_rx_bss_list_deinit(struct net_device *dev)
2264 {
2265 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2266 struct ieee80211_sta_bss *bss, *tmp;
2267
2268 list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
2269 ieee80211_rx_bss_put(dev, bss);
2270 }
2271
2272
2273 static int ieee80211_sta_join_ibss(struct net_device *dev,
2274 struct ieee80211_if_sta *ifsta,
2275 struct ieee80211_sta_bss *bss)
2276 {
2277 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2278 int res, rates, i, j;
2279 struct sk_buff *skb;
2280 struct ieee80211_mgmt *mgmt;
2281 struct ieee80211_tx_control control;
2282 struct rate_selection ratesel;
2283 u8 *pos;
2284 struct ieee80211_sub_if_data *sdata;
2285 struct ieee80211_supported_band *sband;
2286
2287 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2288
2289 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2290
2291 /* Remove possible STA entries from other IBSS networks. */
2292 sta_info_flush_delayed(sdata);
2293
2294 if (local->ops->reset_tsf) {
2295 /* Reset own TSF to allow time synchronization work. */
2296 local->ops->reset_tsf(local_to_hw(local));
2297 }
2298 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2299 res = ieee80211_if_config(dev);
2300 if (res)
2301 return res;
2302
2303 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2304
2305 sdata->drop_unencrypted = bss->capability &
2306 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2307
2308 res = ieee80211_set_freq(local, bss->freq);
2309
2310 if (local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS) {
2311 printk(KERN_DEBUG "%s: IBSS not allowed on frequency "
2312 "%d MHz\n", dev->name, local->oper_channel->center_freq);
2313 return -1;
2314 }
2315
2316 /* Set beacon template */
2317 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2318 do {
2319 if (!skb)
2320 break;
2321
2322 skb_reserve(skb, local->hw.extra_tx_headroom);
2323
2324 mgmt = (struct ieee80211_mgmt *)
2325 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2326 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2327 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2328 IEEE80211_STYPE_BEACON);
2329 memset(mgmt->da, 0xff, ETH_ALEN);
2330 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
2331 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2332 mgmt->u.beacon.beacon_int =
2333 cpu_to_le16(local->hw.conf.beacon_int);
2334 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2335
2336 pos = skb_put(skb, 2 + ifsta->ssid_len);
2337 *pos++ = WLAN_EID_SSID;
2338 *pos++ = ifsta->ssid_len;
2339 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2340
2341 rates = bss->supp_rates_len;
2342 if (rates > 8)
2343 rates = 8;
2344 pos = skb_put(skb, 2 + rates);
2345 *pos++ = WLAN_EID_SUPP_RATES;
2346 *pos++ = rates;
2347 memcpy(pos, bss->supp_rates, rates);
2348
2349 if (bss->band == IEEE80211_BAND_2GHZ) {
2350 pos = skb_put(skb, 2 + 1);
2351 *pos++ = WLAN_EID_DS_PARAMS;
2352 *pos++ = 1;
2353 *pos++ = ieee80211_frequency_to_channel(bss->freq);
2354 }
2355
2356 pos = skb_put(skb, 2 + 2);
2357 *pos++ = WLAN_EID_IBSS_PARAMS;
2358 *pos++ = 2;
2359 /* FIX: set ATIM window based on scan results */
2360 *pos++ = 0;
2361 *pos++ = 0;
2362
2363 if (bss->supp_rates_len > 8) {
2364 rates = bss->supp_rates_len - 8;
2365 pos = skb_put(skb, 2 + rates);
2366 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2367 *pos++ = rates;
2368 memcpy(pos, &bss->supp_rates[8], rates);
2369 }
2370
2371 memset(&control, 0, sizeof(control));
2372 rate_control_get_rate(dev, sband, skb, &ratesel);
2373 if (!ratesel.rate) {
2374 printk(KERN_DEBUG "%s: Failed to determine TX rate "
2375 "for IBSS beacon\n", dev->name);
2376 break;
2377 }
2378 control.vif = &sdata->vif;
2379 control.tx_rate = ratesel.rate;
2380 if (sdata->bss_conf.use_short_preamble &&
2381 ratesel.rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
2382 control.flags |= IEEE80211_TXCTL_SHORT_PREAMBLE;
2383 control.antenna_sel_tx = local->hw.conf.antenna_sel_tx;
2384 control.flags |= IEEE80211_TXCTL_NO_ACK;
2385 control.retry_limit = 1;
2386
2387 ifsta->probe_resp = skb_copy(skb, GFP_ATOMIC);
2388 if (ifsta->probe_resp) {
2389 mgmt = (struct ieee80211_mgmt *)
2390 ifsta->probe_resp->data;
2391 mgmt->frame_control =
2392 IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2393 IEEE80211_STYPE_PROBE_RESP);
2394 } else {
2395 printk(KERN_DEBUG "%s: Could not allocate ProbeResp "
2396 "template for IBSS\n", dev->name);
2397 }
2398
2399 if (local->ops->beacon_update &&
2400 local->ops->beacon_update(local_to_hw(local),
2401 skb, &control) == 0) {
2402 printk(KERN_DEBUG "%s: Configured IBSS beacon "
2403 "template\n", dev->name);
2404 skb = NULL;
2405 }
2406
2407 rates = 0;
2408 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2409 for (i = 0; i < bss->supp_rates_len; i++) {
2410 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2411 for (j = 0; j < sband->n_bitrates; j++)
2412 if (sband->bitrates[j].bitrate == bitrate)
2413 rates |= BIT(j);
2414 }
2415 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
2416
2417 ieee80211_sta_def_wmm_params(dev, bss, 1);
2418 } while (0);
2419
2420 if (skb) {
2421 printk(KERN_DEBUG "%s: Failed to configure IBSS beacon "
2422 "template\n", dev->name);
2423 dev_kfree_skb(skb);
2424 }
2425
2426 ifsta->state = IEEE80211_IBSS_JOINED;
2427 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2428
2429 ieee80211_rx_bss_put(dev, bss);
2430
2431 return res;
2432 }
2433
2434 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
2435 struct ieee802_11_elems *elems,
2436 enum ieee80211_band band)
2437 {
2438 struct ieee80211_supported_band *sband;
2439 struct ieee80211_rate *bitrates;
2440 size_t num_rates;
2441 u64 supp_rates;
2442 int i, j;
2443 sband = local->hw.wiphy->bands[band];
2444
2445 if (!sband) {
2446 WARN_ON(1);
2447 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2448 }
2449
2450 bitrates = sband->bitrates;
2451 num_rates = sband->n_bitrates;
2452 supp_rates = 0;
2453 for (i = 0; i < elems->supp_rates_len +
2454 elems->ext_supp_rates_len; i++) {
2455 u8 rate = 0;
2456 int own_rate;
2457 if (i < elems->supp_rates_len)
2458 rate = elems->supp_rates[i];
2459 else if (elems->ext_supp_rates)
2460 rate = elems->ext_supp_rates
2461 [i - elems->supp_rates_len];
2462 own_rate = 5 * (rate & 0x7f);
2463 for (j = 0; j < num_rates; j++)
2464 if (bitrates[j].bitrate == own_rate)
2465 supp_rates |= BIT(j);
2466 }
2467 return supp_rates;
2468 }
2469
2470
2471 static void ieee80211_rx_bss_info(struct net_device *dev,
2472 struct ieee80211_mgmt *mgmt,
2473 size_t len,
2474 struct ieee80211_rx_status *rx_status,
2475 int beacon)
2476 {
2477 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2478 struct ieee802_11_elems elems;
2479 size_t baselen;
2480 int freq, clen;
2481 struct ieee80211_sta_bss *bss;
2482 struct sta_info *sta;
2483 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2484 u64 beacon_timestamp, rx_timestamp;
2485 struct ieee80211_channel *channel;
2486 DECLARE_MAC_BUF(mac);
2487 DECLARE_MAC_BUF(mac2);
2488
2489 if (!beacon && memcmp(mgmt->da, dev->dev_addr, ETH_ALEN))
2490 return; /* ignore ProbeResp to foreign address */
2491
2492 #if 0
2493 printk(KERN_DEBUG "%s: RX %s from %s to %s\n",
2494 dev->name, beacon ? "Beacon" : "Probe Response",
2495 print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da));
2496 #endif
2497
2498 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2499 if (baselen > len)
2500 return;
2501
2502 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
2503 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
2504
2505 if (ieee80211_vif_is_mesh(&sdata->vif) && elems.mesh_id &&
2506 elems.mesh_config && mesh_matches_local(&elems, dev)) {
2507 u64 rates = ieee80211_sta_get_rates(local, &elems,
2508 rx_status->band);
2509
2510 mesh_neighbour_update(mgmt->sa, rates, dev,
2511 mesh_peer_accepts_plinks(&elems, dev));
2512 }
2513
2514 rcu_read_lock();
2515
2516 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && elems.supp_rates &&
2517 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0 &&
2518 (sta = sta_info_get(local, mgmt->sa))) {
2519 u64 prev_rates;
2520 u64 supp_rates = ieee80211_sta_get_rates(local, &elems,
2521 rx_status->band);
2522
2523 prev_rates = sta->supp_rates[rx_status->band];
2524 sta->supp_rates[rx_status->band] &= supp_rates;
2525 if (sta->supp_rates[rx_status->band] == 0) {
2526 /* No matching rates - this should not really happen.
2527 * Make sure that at least one rate is marked
2528 * supported to avoid issues with TX rate ctrl. */
2529 sta->supp_rates[rx_status->band] =
2530 sdata->u.sta.supp_rates_bits[rx_status->band];
2531 }
2532 if (sta->supp_rates[rx_status->band] != prev_rates) {
2533 printk(KERN_DEBUG "%s: updated supp_rates set for "
2534 "%s based on beacon info (0x%llx & 0x%llx -> "
2535 "0x%llx)\n",
2536 dev->name, print_mac(mac, sta->addr),
2537 (unsigned long long) prev_rates,
2538 (unsigned long long) supp_rates,
2539 (unsigned long long) sta->supp_rates[rx_status->band]);
2540 }
2541 }
2542
2543 rcu_read_unlock();
2544
2545 if (elems.ds_params && elems.ds_params_len == 1)
2546 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
2547 else
2548 freq = rx_status->freq;
2549
2550 channel = ieee80211_get_channel(local->hw.wiphy, freq);
2551
2552 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2553 return;
2554
2555 #ifdef CONFIG_MAC80211_MESH
2556 if (elems.mesh_config)
2557 bss = ieee80211_rx_mesh_bss_get(dev, elems.mesh_id,
2558 elems.mesh_id_len, elems.mesh_config, freq);
2559 else
2560 #endif
2561 bss = ieee80211_rx_bss_get(dev, mgmt->bssid, freq,
2562 elems.ssid, elems.ssid_len);
2563 if (!bss) {
2564 #ifdef CONFIG_MAC80211_MESH
2565 if (elems.mesh_config)
2566 bss = ieee80211_rx_mesh_bss_add(dev, elems.mesh_id,
2567 elems.mesh_id_len, elems.mesh_config,
2568 elems.mesh_config_len, freq);
2569 else
2570 #endif
2571 bss = ieee80211_rx_bss_add(dev, mgmt->bssid, freq,
2572 elems.ssid, elems.ssid_len);
2573 if (!bss)
2574 return;
2575 } else {
2576 #if 0
2577 /* TODO: order by RSSI? */
2578 spin_lock_bh(&local->sta_bss_lock);
2579 list_move_tail(&bss->list, &local->sta_bss_list);
2580 spin_unlock_bh(&local->sta_bss_lock);
2581 #endif
2582 }
2583
2584 /* save the ERP value so that it is available at association time */
2585 if (elems.erp_info && elems.erp_info_len >= 1) {
2586 bss->erp_value = elems.erp_info[0];
2587 bss->has_erp_value = 1;
2588 }
2589
2590 if (elems.ht_cap_elem &&
2591 (!bss->ht_ie || bss->ht_ie_len != elems.ht_cap_elem_len ||
2592 memcmp(bss->ht_ie, elems.ht_cap_elem, elems.ht_cap_elem_len))) {
2593 kfree(bss->ht_ie);
2594 bss->ht_ie = kmalloc(elems.ht_cap_elem_len + 2, GFP_ATOMIC);
2595 if (bss->ht_ie) {
2596 memcpy(bss->ht_ie, elems.ht_cap_elem - 2,
2597 elems.ht_cap_elem_len + 2);
2598 bss->ht_ie_len = elems.ht_cap_elem_len + 2;
2599 } else
2600 bss->ht_ie_len = 0;
2601 } else if (!elems.ht_cap_elem && bss->ht_ie) {
2602 kfree(bss->ht_ie);
2603 bss->ht_ie = NULL;
2604 bss->ht_ie_len = 0;
2605 }
2606
2607 bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
2608 bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
2609
2610 bss->supp_rates_len = 0;
2611 if (elems.supp_rates) {
2612 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2613 if (clen > elems.supp_rates_len)
2614 clen = elems.supp_rates_len;
2615 memcpy(&bss->supp_rates[bss->supp_rates_len], elems.supp_rates,
2616 clen);
2617 bss->supp_rates_len += clen;
2618 }
2619 if (elems.ext_supp_rates) {
2620 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2621 if (clen > elems.ext_supp_rates_len)
2622 clen = elems.ext_supp_rates_len;
2623 memcpy(&bss->supp_rates[bss->supp_rates_len],
2624 elems.ext_supp_rates, clen);
2625 bss->supp_rates_len += clen;
2626 }
2627
2628 bss->band = rx_status->band;
2629
2630 bss->timestamp = beacon_timestamp;
2631 bss->last_update = jiffies;
2632 bss->signal = rx_status->signal;
2633 bss->noise = rx_status->noise;
2634 bss->qual = rx_status->qual;
2635 if (!beacon && !bss->probe_resp)
2636 bss->probe_resp = true;
2637
2638 /*
2639 * In STA mode, the remaining parameters should not be overridden
2640 * by beacons because they're not necessarily accurate there.
2641 */
2642 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
2643 bss->probe_resp && beacon) {
2644 ieee80211_rx_bss_put(dev, bss);
2645 return;
2646 }
2647
2648 if (elems.wpa &&
2649 (!bss->wpa_ie || bss->wpa_ie_len != elems.wpa_len ||
2650 memcmp(bss->wpa_ie, elems.wpa, elems.wpa_len))) {
2651 kfree(bss->wpa_ie);
2652 bss->wpa_ie = kmalloc(elems.wpa_len + 2, GFP_ATOMIC);
2653 if (bss->wpa_ie) {
2654 memcpy(bss->wpa_ie, elems.wpa - 2, elems.wpa_len + 2);
2655 bss->wpa_ie_len = elems.wpa_len + 2;
2656 } else
2657 bss->wpa_ie_len = 0;
2658 } else if (!elems.wpa && bss->wpa_ie) {
2659 kfree(bss->wpa_ie);
2660 bss->wpa_ie = NULL;
2661 bss->wpa_ie_len = 0;
2662 }
2663
2664 if (elems.rsn &&
2665 (!bss->rsn_ie || bss->rsn_ie_len != elems.rsn_len ||
2666 memcmp(bss->rsn_ie, elems.rsn, elems.rsn_len))) {
2667 kfree(bss->rsn_ie);
2668 bss->rsn_ie = kmalloc(elems.rsn_len + 2, GFP_ATOMIC);
2669 if (bss->rsn_ie) {
2670 memcpy(bss->rsn_ie, elems.rsn - 2, elems.rsn_len + 2);
2671 bss->rsn_ie_len = elems.rsn_len + 2;
2672 } else
2673 bss->rsn_ie_len = 0;
2674 } else if (!elems.rsn && bss->rsn_ie) {
2675 kfree(bss->rsn_ie);
2676 bss->rsn_ie = NULL;
2677 bss->rsn_ie_len = 0;
2678 }
2679
2680 /*
2681 * Cf.
2682 * http://www.wipo.int/pctdb/en/wo.jsp?wo=2007047181&IA=WO2007047181&DISPLAY=DESC
2683 *
2684 * quoting:
2685 *
2686 * In particular, "Wi-Fi CERTIFIED for WMM - Support for Multimedia
2687 * Applications with Quality of Service in Wi-Fi Networks," Wi- Fi
2688 * Alliance (September 1, 2004) is incorporated by reference herein.
2689 * The inclusion of the WMM Parameters in probe responses and
2690 * association responses is mandatory for WMM enabled networks. The
2691 * inclusion of the WMM Parameters in beacons, however, is optional.
2692 */
2693
2694 if (elems.wmm_param &&
2695 (!bss->wmm_ie || bss->wmm_ie_len != elems.wmm_param_len ||
2696 memcmp(bss->wmm_ie, elems.wmm_param, elems.wmm_param_len))) {
2697 kfree(bss->wmm_ie);
2698 bss->wmm_ie = kmalloc(elems.wmm_param_len + 2, GFP_ATOMIC);
2699 if (bss->wmm_ie) {
2700 memcpy(bss->wmm_ie, elems.wmm_param - 2,
2701 elems.wmm_param_len + 2);
2702 bss->wmm_ie_len = elems.wmm_param_len + 2;
2703 } else
2704 bss->wmm_ie_len = 0;
2705 } else if (elems.wmm_info &&
2706 (!bss->wmm_ie || bss->wmm_ie_len != elems.wmm_info_len ||
2707 memcmp(bss->wmm_ie, elems.wmm_info, elems.wmm_info_len))) {
2708 /* As for certain AP's Fifth bit is not set in WMM IE in
2709 * beacon frames.So while parsing the beacon frame the
2710 * wmm_info structure is used instead of wmm_param.
2711 * wmm_info structure was never used to set bss->wmm_ie.
2712 * This code fixes this problem by copying the WME
2713 * information from wmm_info to bss->wmm_ie and enabling
2714 * n-band association.
2715 */
2716 kfree(bss->wmm_ie);
2717 bss->wmm_ie = kmalloc(elems.wmm_info_len + 2, GFP_ATOMIC);
2718 if (bss->wmm_ie) {
2719 memcpy(bss->wmm_ie, elems.wmm_info - 2,
2720 elems.wmm_info_len + 2);
2721 bss->wmm_ie_len = elems.wmm_info_len + 2;
2722 } else
2723 bss->wmm_ie_len = 0;
2724 } else if (!elems.wmm_param && !elems.wmm_info && bss->wmm_ie) {
2725 kfree(bss->wmm_ie);
2726 bss->wmm_ie = NULL;
2727 bss->wmm_ie_len = 0;
2728 }
2729
2730 /* check if we need to merge IBSS */
2731 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
2732 !local->sta_sw_scanning && !local->sta_hw_scanning &&
2733 bss->capability & WLAN_CAPABILITY_IBSS &&
2734 bss->freq == local->oper_channel->center_freq &&
2735 elems.ssid_len == sdata->u.sta.ssid_len &&
2736 memcmp(elems.ssid, sdata->u.sta.ssid, sdata->u.sta.ssid_len) == 0) {
2737 if (rx_status->flag & RX_FLAG_TSFT) {
2738 /* in order for correct IBSS merging we need mactime
2739 *
2740 * since mactime is defined as the time the first data
2741 * symbol of the frame hits the PHY, and the timestamp
2742 * of the beacon is defined as "the time that the data
2743 * symbol containing the first bit of the timestamp is
2744 * transmitted to the PHY plus the transmitting STA’s
2745 * delays through its local PHY from the MAC-PHY
2746 * interface to its interface with the WM"
2747 * (802.11 11.1.2) - equals the time this bit arrives at
2748 * the receiver - we have to take into account the
2749 * offset between the two.
2750 * e.g: at 1 MBit that means mactime is 192 usec earlier
2751 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
2752 */
2753 int rate = local->hw.wiphy->bands[rx_status->band]->
2754 bitrates[rx_status->rate_idx].bitrate;
2755 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
2756 } else if (local && local->ops && local->ops->get_tsf)
2757 /* second best option: get current TSF */
2758 rx_timestamp = local->ops->get_tsf(local_to_hw(local));
2759 else
2760 /* can't merge without knowing the TSF */
2761 rx_timestamp = -1LLU;
2762 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2763 printk(KERN_DEBUG "RX beacon SA=%s BSSID="
2764 "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
2765 print_mac(mac, mgmt->sa),
2766 print_mac(mac2, mgmt->bssid),
2767 (unsigned long long)rx_timestamp,
2768 (unsigned long long)beacon_timestamp,
2769 (unsigned long long)(rx_timestamp - beacon_timestamp),
2770 jiffies);
2771 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2772 if (beacon_timestamp > rx_timestamp) {
2773 #ifndef CONFIG_MAC80211_IBSS_DEBUG
2774 if (net_ratelimit())
2775 #endif
2776 printk(KERN_DEBUG "%s: beacon TSF higher than "
2777 "local TSF - IBSS merge with BSSID %s\n",
2778 dev->name, print_mac(mac, mgmt->bssid));
2779 ieee80211_sta_join_ibss(dev, &sdata->u.sta, bss);
2780 ieee80211_ibss_add_sta(dev, NULL,
2781 mgmt->bssid, mgmt->sa);
2782 }
2783 }
2784
2785 ieee80211_rx_bss_put(dev, bss);
2786 }
2787
2788
2789 static void ieee80211_rx_mgmt_probe_resp(struct net_device *dev,
2790 struct ieee80211_mgmt *mgmt,
2791 size_t len,
2792 struct ieee80211_rx_status *rx_status)
2793 {
2794 ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 0);
2795 }
2796
2797
2798 static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
2799 struct ieee80211_mgmt *mgmt,
2800 size_t len,
2801 struct ieee80211_rx_status *rx_status)
2802 {
2803 struct ieee80211_sub_if_data *sdata;
2804 struct ieee80211_if_sta *ifsta;
2805 size_t baselen;
2806 struct ieee802_11_elems elems;
2807 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2808 struct ieee80211_conf *conf = &local->hw.conf;
2809 u32 changed = 0;
2810
2811 ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 1);
2812
2813 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2814 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2815 return;
2816 ifsta = &sdata->u.sta;
2817
2818 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
2819 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
2820 return;
2821
2822 /* Process beacon from the current BSS */
2823 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2824 if (baselen > len)
2825 return;
2826
2827 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
2828
2829 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
2830 elems.wmm_param_len);
2831
2832 /* Do not send changes to driver if we are scanning. This removes
2833 * requirement that driver's bss_info_changed function needs to be
2834 * atomic. */
2835 if (local->sta_sw_scanning || local->sta_hw_scanning)
2836 return;
2837
2838 if (elems.erp_info && elems.erp_info_len >= 1)
2839 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
2840 else {
2841 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
2842 changed |= ieee80211_handle_protect_preamb(sdata, false,
2843 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
2844 }
2845
2846 if (elems.ht_cap_elem && elems.ht_info_elem &&
2847 elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
2848 struct ieee80211_ht_bss_info bss_info;
2849
2850 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2851 (struct ieee80211_ht_addt_info *)
2852 elems.ht_info_elem, &bss_info);
2853 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
2854 &bss_info);
2855 }
2856
2857 ieee80211_bss_info_change_notify(sdata, changed);
2858 }
2859
2860
2861 static void ieee80211_rx_mgmt_probe_req(struct net_device *dev,
2862 struct ieee80211_if_sta *ifsta,
2863 struct ieee80211_mgmt *mgmt,
2864 size_t len,
2865 struct ieee80211_rx_status *rx_status)
2866 {
2867 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2868 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2869 int tx_last_beacon;
2870 struct sk_buff *skb;
2871 struct ieee80211_mgmt *resp;
2872 u8 *pos, *end;
2873 DECLARE_MAC_BUF(mac);
2874 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2875 DECLARE_MAC_BUF(mac2);
2876 DECLARE_MAC_BUF(mac3);
2877 #endif
2878
2879 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS ||
2880 ifsta->state != IEEE80211_IBSS_JOINED ||
2881 len < 24 + 2 || !ifsta->probe_resp)
2882 return;
2883
2884 if (local->ops->tx_last_beacon)
2885 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2886 else
2887 tx_last_beacon = 1;
2888
2889 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2890 printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
2891 "%s (tx_last_beacon=%d)\n",
2892 dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
2893 print_mac(mac3, mgmt->bssid), tx_last_beacon);
2894 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2895
2896 if (!tx_last_beacon)
2897 return;
2898
2899 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2900 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2901 return;
2902
2903 end = ((u8 *) mgmt) + len;
2904 pos = mgmt->u.probe_req.variable;
2905 if (pos[0] != WLAN_EID_SSID ||
2906 pos + 2 + pos[1] > end) {
2907 if (net_ratelimit()) {
2908 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2909 "from %s\n",
2910 dev->name, print_mac(mac, mgmt->sa));
2911 }
2912 return;
2913 }
2914 if (pos[1] != 0 &&
2915 (pos[1] != ifsta->ssid_len ||
2916 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
2917 /* Ignore ProbeReq for foreign SSID */
2918 return;
2919 }
2920
2921 /* Reply with ProbeResp */
2922 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
2923 if (!skb)
2924 return;
2925
2926 resp = (struct ieee80211_mgmt *) skb->data;
2927 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2928 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2929 printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
2930 dev->name, print_mac(mac, resp->da));
2931 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2932 ieee80211_sta_tx(dev, skb, 0);
2933 }
2934
2935 static void ieee80211_rx_mgmt_action(struct net_device *dev,
2936 struct ieee80211_if_sta *ifsta,
2937 struct ieee80211_mgmt *mgmt,
2938 size_t len,
2939 struct ieee80211_rx_status *rx_status)
2940 {
2941 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2942
2943 if (len < IEEE80211_MIN_ACTION_SIZE)
2944 return;
2945
2946 switch (mgmt->u.action.category) {
2947 case WLAN_CATEGORY_BACK:
2948 switch (mgmt->u.action.u.addba_req.action_code) {
2949 case WLAN_ACTION_ADDBA_REQ:
2950 if (len < (IEEE80211_MIN_ACTION_SIZE +
2951 sizeof(mgmt->u.action.u.addba_req)))
2952 break;
2953 ieee80211_sta_process_addba_request(dev, mgmt, len);
2954 break;
2955 case WLAN_ACTION_ADDBA_RESP:
2956 if (len < (IEEE80211_MIN_ACTION_SIZE +
2957 sizeof(mgmt->u.action.u.addba_resp)))
2958 break;
2959 ieee80211_sta_process_addba_resp(dev, mgmt, len);
2960 break;
2961 case WLAN_ACTION_DELBA:
2962 if (len < (IEEE80211_MIN_ACTION_SIZE +
2963 sizeof(mgmt->u.action.u.delba)))
2964 break;
2965 ieee80211_sta_process_delba(dev, mgmt, len);
2966 break;
2967 default:
2968 if (net_ratelimit())
2969 printk(KERN_DEBUG "%s: Rx unknown A-MPDU action\n",
2970 dev->name);
2971 break;
2972 }
2973 break;
2974 case PLINK_CATEGORY:
2975 if (ieee80211_vif_is_mesh(&sdata->vif))
2976 mesh_rx_plink_frame(dev, mgmt, len, rx_status);
2977 break;
2978 case MESH_PATH_SEL_CATEGORY:
2979 if (ieee80211_vif_is_mesh(&sdata->vif))
2980 mesh_rx_path_sel_frame(dev, mgmt, len);
2981 break;
2982 default:
2983 if (net_ratelimit())
2984 printk(KERN_DEBUG "%s: Rx unknown action frame - "
2985 "category=%d\n", dev->name, mgmt->u.action.category);
2986 break;
2987 }
2988 }
2989
2990 void ieee80211_sta_rx_mgmt(struct net_device *dev, struct sk_buff *skb,
2991 struct ieee80211_rx_status *rx_status)
2992 {
2993 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2994 struct ieee80211_sub_if_data *sdata;
2995 struct ieee80211_if_sta *ifsta;
2996 struct ieee80211_mgmt *mgmt;
2997 u16 fc;
2998
2999 if (skb->len < 24)
3000 goto fail;
3001
3002 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3003 ifsta = &sdata->u.sta;
3004
3005 mgmt = (struct ieee80211_mgmt *) skb->data;
3006 fc = le16_to_cpu(mgmt->frame_control);
3007
3008 switch (fc & IEEE80211_FCTL_STYPE) {
3009 case IEEE80211_STYPE_PROBE_REQ:
3010 case IEEE80211_STYPE_PROBE_RESP:
3011 case IEEE80211_STYPE_BEACON:
3012 case IEEE80211_STYPE_ACTION:
3013 memcpy(skb->cb, rx_status, sizeof(*rx_status));
3014 case IEEE80211_STYPE_AUTH:
3015 case IEEE80211_STYPE_ASSOC_RESP:
3016 case IEEE80211_STYPE_REASSOC_RESP:
3017 case IEEE80211_STYPE_DEAUTH:
3018 case IEEE80211_STYPE_DISASSOC:
3019 skb_queue_tail(&ifsta->skb_queue, skb);
3020 queue_work(local->hw.workqueue, &ifsta->work);
3021 return;
3022 default:
3023 printk(KERN_DEBUG "%s: received unknown management frame - "
3024 "stype=%d\n", dev->name,
3025 (fc & IEEE80211_FCTL_STYPE) >> 4);
3026 break;
3027 }
3028
3029 fail:
3030 kfree_skb(skb);
3031 }
3032
3033
3034 static void ieee80211_sta_rx_queued_mgmt(struct net_device *dev,
3035 struct sk_buff *skb)
3036 {
3037 struct ieee80211_rx_status *rx_status;
3038 struct ieee80211_sub_if_data *sdata;
3039 struct ieee80211_if_sta *ifsta;
3040 struct ieee80211_mgmt *mgmt;
3041 u16 fc;
3042
3043 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3044 ifsta = &sdata->u.sta;
3045
3046 rx_status = (struct ieee80211_rx_status *) skb->cb;
3047 mgmt = (struct ieee80211_mgmt *) skb->data;
3048 fc = le16_to_cpu(mgmt->frame_control);
3049
3050 switch (fc & IEEE80211_FCTL_STYPE) {
3051 case IEEE80211_STYPE_PROBE_REQ:
3052 ieee80211_rx_mgmt_probe_req(dev, ifsta, mgmt, skb->len,
3053 rx_status);
3054 break;
3055 case IEEE80211_STYPE_PROBE_RESP:
3056 ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
3057 break;
3058 case IEEE80211_STYPE_BEACON:
3059 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
3060 break;
3061 case IEEE80211_STYPE_AUTH:
3062 ieee80211_rx_mgmt_auth(dev, ifsta, mgmt, skb->len);
3063 break;
3064 case IEEE80211_STYPE_ASSOC_RESP:
3065 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
3066 break;
3067 case IEEE80211_STYPE_REASSOC_RESP:
3068 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
3069 break;
3070 case IEEE80211_STYPE_DEAUTH:
3071 ieee80211_rx_mgmt_deauth(dev, ifsta, mgmt, skb->len);
3072 break;
3073 case IEEE80211_STYPE_DISASSOC:
3074 ieee80211_rx_mgmt_disassoc(dev, ifsta, mgmt, skb->len);
3075 break;
3076 case IEEE80211_STYPE_ACTION:
3077 ieee80211_rx_mgmt_action(dev, ifsta, mgmt, skb->len, rx_status);
3078 break;
3079 }
3080
3081 kfree_skb(skb);
3082 }
3083
3084
3085 ieee80211_rx_result
3086 ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
3087 struct ieee80211_rx_status *rx_status)
3088 {
3089 struct ieee80211_mgmt *mgmt;
3090 u16 fc;
3091
3092 if (skb->len < 2)
3093 return RX_DROP_UNUSABLE;
3094
3095 mgmt = (struct ieee80211_mgmt *) skb->data;
3096 fc = le16_to_cpu(mgmt->frame_control);
3097
3098 if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL)
3099 return RX_CONTINUE;
3100
3101 if (skb->len < 24)
3102 return RX_DROP_MONITOR;
3103
3104 if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) {
3105 if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP) {
3106 ieee80211_rx_mgmt_probe_resp(dev, mgmt,
3107 skb->len, rx_status);
3108 dev_kfree_skb(skb);
3109 return RX_QUEUED;
3110 } else if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) {
3111 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len,
3112 rx_status);
3113 dev_kfree_skb(skb);
3114 return RX_QUEUED;
3115 }
3116 }
3117 return RX_CONTINUE;
3118 }
3119
3120
3121 static int ieee80211_sta_active_ibss(struct net_device *dev)
3122 {
3123 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3124 int active = 0;
3125 struct sta_info *sta;
3126 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3127
3128 rcu_read_lock();
3129
3130 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3131 if (sta->sdata == sdata &&
3132 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
3133 jiffies)) {
3134 active++;
3135 break;
3136 }
3137 }
3138
3139 rcu_read_unlock();
3140
3141 return active;
3142 }
3143
3144
3145 static void ieee80211_sta_expire(struct net_device *dev, unsigned long exp_time)
3146 {
3147 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3148 struct sta_info *sta, *tmp;
3149 LIST_HEAD(tmp_list);
3150 DECLARE_MAC_BUF(mac);
3151 unsigned long flags;
3152
3153 spin_lock_irqsave(&local->sta_lock, flags);
3154 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
3155 if (time_after(jiffies, sta->last_rx + exp_time)) {
3156 printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
3157 dev->name, print_mac(mac, sta->addr));
3158 __sta_info_unlink(&sta);
3159 if (sta)
3160 list_add(&sta->list, &tmp_list);
3161 }
3162 spin_unlock_irqrestore(&local->sta_lock, flags);
3163
3164 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
3165 sta_info_destroy(sta);
3166 }
3167
3168
3169 static void ieee80211_sta_merge_ibss(struct net_device *dev,
3170 struct ieee80211_if_sta *ifsta)
3171 {
3172 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
3173
3174 ieee80211_sta_expire(dev, IEEE80211_IBSS_INACTIVITY_LIMIT);
3175 if (ieee80211_sta_active_ibss(dev))
3176 return;
3177
3178 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
3179 "IBSS networks with same SSID (merge)\n", dev->name);
3180 ieee80211_sta_req_scan(dev, ifsta->ssid, ifsta->ssid_len);
3181 }
3182
3183
3184 #ifdef CONFIG_MAC80211_MESH
3185 static void ieee80211_mesh_housekeeping(struct net_device *dev,
3186 struct ieee80211_if_sta *ifsta)
3187 {
3188 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3189 bool free_plinks;
3190
3191 ieee80211_sta_expire(dev, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
3192 mesh_path_expire(dev);
3193
3194 free_plinks = mesh_plink_availables(sdata);
3195 if (free_plinks != sdata->u.sta.accepting_plinks)
3196 ieee80211_if_config_beacon(dev);
3197
3198 mod_timer(&ifsta->timer, jiffies +
3199 IEEE80211_MESH_HOUSEKEEPING_INTERVAL);
3200 }
3201
3202
3203 void ieee80211_start_mesh(struct net_device *dev)
3204 {
3205 struct ieee80211_if_sta *ifsta;
3206 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3207 ifsta = &sdata->u.sta;
3208 ifsta->state = IEEE80211_MESH_UP;
3209 ieee80211_sta_timer((unsigned long)sdata);
3210 }
3211 #endif
3212
3213
3214 void ieee80211_sta_timer(unsigned long data)
3215 {
3216 struct ieee80211_sub_if_data *sdata =
3217 (struct ieee80211_sub_if_data *) data;
3218 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3219 struct ieee80211_local *local = wdev_priv(&sdata->wdev);
3220
3221 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3222 queue_work(local->hw.workqueue, &ifsta->work);
3223 }
3224
3225 void ieee80211_sta_work(struct work_struct *work)
3226 {
3227 struct ieee80211_sub_if_data *sdata =
3228 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
3229 struct net_device *dev = sdata->dev;
3230 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3231 struct ieee80211_if_sta *ifsta;
3232 struct sk_buff *skb;
3233
3234 if (!netif_running(dev))
3235 return;
3236
3237 if (local->sta_sw_scanning || local->sta_hw_scanning)
3238 return;
3239
3240 if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
3241 sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
3242 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT) {
3243 printk(KERN_DEBUG "%s: ieee80211_sta_work: non-STA interface "
3244 "(type=%d)\n", dev->name, sdata->vif.type);
3245 return;
3246 }
3247 ifsta = &sdata->u.sta;
3248
3249 while ((skb = skb_dequeue(&ifsta->skb_queue)))
3250 ieee80211_sta_rx_queued_mgmt(dev, skb);
3251
3252 #ifdef CONFIG_MAC80211_MESH
3253 if (ifsta->preq_queue_len &&
3254 time_after(jiffies,
3255 ifsta->last_preq + msecs_to_jiffies(ifsta->mshcfg.dot11MeshHWMPpreqMinInterval)))
3256 mesh_path_start_discovery(dev);
3257 #endif
3258
3259 if (ifsta->state != IEEE80211_AUTHENTICATE &&
3260 ifsta->state != IEEE80211_ASSOCIATE &&
3261 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
3262 if (ifsta->scan_ssid_len)
3263 ieee80211_sta_start_scan(dev, ifsta->scan_ssid, ifsta->scan_ssid_len);
3264 else
3265 ieee80211_sta_start_scan(dev, NULL, 0);
3266 return;
3267 }
3268
3269 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
3270 if (ieee80211_sta_config_auth(dev, ifsta))
3271 return;
3272 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3273 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
3274 return;
3275
3276 switch (ifsta->state) {
3277 case IEEE80211_DISABLED:
3278 break;
3279 case IEEE80211_AUTHENTICATE:
3280 ieee80211_authenticate(dev, ifsta);
3281 break;
3282 case IEEE80211_ASSOCIATE:
3283 ieee80211_associate(dev, ifsta);
3284 break;
3285 case IEEE80211_ASSOCIATED:
3286 ieee80211_associated(dev, ifsta);
3287 break;
3288 case IEEE80211_IBSS_SEARCH:
3289 ieee80211_sta_find_ibss(dev, ifsta);
3290 break;
3291 case IEEE80211_IBSS_JOINED:
3292 ieee80211_sta_merge_ibss(dev, ifsta);
3293 break;
3294 #ifdef CONFIG_MAC80211_MESH
3295 case IEEE80211_MESH_UP:
3296 ieee80211_mesh_housekeeping(dev, ifsta);
3297 break;
3298 #endif
3299 default:
3300 printk(KERN_DEBUG "ieee80211_sta_work: Unknown state %d\n",
3301 ifsta->state);
3302 break;
3303 }
3304
3305 if (ieee80211_privacy_mismatch(dev, ifsta)) {
3306 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
3307 "mixed-cell disabled - disassociate\n", dev->name);
3308
3309 ieee80211_send_disassoc(dev, ifsta, WLAN_REASON_UNSPECIFIED);
3310 ieee80211_set_disassoc(dev, ifsta, 0);
3311 }
3312 }
3313
3314
3315 static void ieee80211_sta_reset_auth(struct net_device *dev,
3316 struct ieee80211_if_sta *ifsta)
3317 {
3318 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3319
3320 if (local->ops->reset_tsf) {
3321 /* Reset own TSF to allow time synchronization work. */
3322 local->ops->reset_tsf(local_to_hw(local));
3323 }
3324
3325 ifsta->wmm_last_param_set = -1; /* allow any WMM update */
3326
3327
3328 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
3329 ifsta->auth_alg = WLAN_AUTH_OPEN;
3330 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
3331 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
3332 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
3333 ifsta->auth_alg = WLAN_AUTH_LEAP;
3334 else
3335 ifsta->auth_alg = WLAN_AUTH_OPEN;
3336 printk(KERN_DEBUG "%s: Initial auth_alg=%d\n", dev->name,
3337 ifsta->auth_alg);
3338 ifsta->auth_transaction = -1;
3339 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
3340 ifsta->auth_tries = ifsta->assoc_tries = 0;
3341 netif_carrier_off(dev);
3342 }
3343
3344
3345 void ieee80211_sta_req_auth(struct net_device *dev,
3346 struct ieee80211_if_sta *ifsta)
3347 {
3348 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3349 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3350
3351 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3352 return;
3353
3354 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
3355 IEEE80211_STA_AUTO_BSSID_SEL)) &&
3356 (ifsta->flags & (IEEE80211_STA_SSID_SET |
3357 IEEE80211_STA_AUTO_SSID_SEL))) {
3358 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3359 queue_work(local->hw.workqueue, &ifsta->work);
3360 }
3361 }
3362
3363 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
3364 const char *ssid, int ssid_len)
3365 {
3366 int tmp, hidden_ssid;
3367
3368 if (ssid_len == ifsta->ssid_len &&
3369 !memcmp(ifsta->ssid, ssid, ssid_len))
3370 return 1;
3371
3372 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
3373 return 0;
3374
3375 hidden_ssid = 1;
3376 tmp = ssid_len;
3377 while (tmp--) {
3378 if (ssid[tmp] != '\0') {
3379 hidden_ssid = 0;
3380 break;
3381 }
3382 }
3383
3384 if (hidden_ssid && ifsta->ssid_len == ssid_len)
3385 return 1;
3386
3387 if (ssid_len == 1 && ssid[0] == ' ')
3388 return 1;
3389
3390 return 0;
3391 }
3392
3393 static int ieee80211_sta_config_auth(struct net_device *dev,
3394 struct ieee80211_if_sta *ifsta)
3395 {
3396 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3397 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3398 struct ieee80211_sta_bss *bss, *selected = NULL;
3399 int top_rssi = 0, freq;
3400
3401 if (!(ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
3402 IEEE80211_STA_AUTO_BSSID_SEL | IEEE80211_STA_AUTO_CHANNEL_SEL))) {
3403 ifsta->state = IEEE80211_AUTHENTICATE;
3404 ieee80211_sta_reset_auth(dev, ifsta);
3405 return 0;
3406 }
3407
3408 spin_lock_bh(&local->sta_bss_lock);
3409 freq = local->oper_channel->center_freq;
3410 list_for_each_entry(bss, &local->sta_bss_list, list) {
3411 if (!(bss->capability & WLAN_CAPABILITY_ESS))
3412 continue;
3413
3414 if (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
3415 !!sdata->default_key)
3416 continue;
3417
3418 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
3419 bss->freq != freq)
3420 continue;
3421
3422 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
3423 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
3424 continue;
3425
3426 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
3427 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
3428 continue;
3429
3430 if (!selected || top_rssi < bss->signal) {
3431 selected = bss;
3432 top_rssi = bss->signal;
3433 }
3434 }
3435 if (selected)
3436 atomic_inc(&selected->users);
3437 spin_unlock_bh(&local->sta_bss_lock);
3438
3439 if (selected) {
3440 ieee80211_set_freq(local, selected->freq);
3441 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
3442 ieee80211_sta_set_ssid(dev, selected->ssid,
3443 selected->ssid_len);
3444 ieee80211_sta_set_bssid(dev, selected->bssid);
3445 ieee80211_sta_def_wmm_params(dev, selected, 0);
3446 ieee80211_rx_bss_put(dev, selected);
3447 ifsta->state = IEEE80211_AUTHENTICATE;
3448 ieee80211_sta_reset_auth(dev, ifsta);
3449 return 0;
3450 } else {
3451 if (ifsta->state != IEEE80211_AUTHENTICATE) {
3452 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
3453 ieee80211_sta_start_scan(dev, NULL, 0);
3454 else
3455 ieee80211_sta_start_scan(dev, ifsta->ssid,
3456 ifsta->ssid_len);
3457 ifsta->state = IEEE80211_AUTHENTICATE;
3458 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3459 } else
3460 ifsta->state = IEEE80211_DISABLED;
3461 }
3462 return -1;
3463 }
3464
3465
3466 static int ieee80211_sta_create_ibss(struct net_device *dev,
3467 struct ieee80211_if_sta *ifsta)
3468 {
3469 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3470 struct ieee80211_sta_bss *bss;
3471 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3472 struct ieee80211_supported_band *sband;
3473 u8 bssid[ETH_ALEN], *pos;
3474 int i;
3475 DECLARE_MAC_BUF(mac);
3476
3477 #if 0
3478 /* Easier testing, use fixed BSSID. */
3479 memset(bssid, 0xfe, ETH_ALEN);
3480 #else
3481 /* Generate random, not broadcast, locally administered BSSID. Mix in
3482 * own MAC address to make sure that devices that do not have proper
3483 * random number generator get different BSSID. */
3484 get_random_bytes(bssid, ETH_ALEN);
3485 for (i = 0; i < ETH_ALEN; i++)
3486 bssid[i] ^= dev->dev_addr[i];
3487 bssid[0] &= ~0x01;
3488 bssid[0] |= 0x02;
3489 #endif
3490
3491 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
3492 dev->name, print_mac(mac, bssid));
3493
3494 bss = ieee80211_rx_bss_add(dev, bssid,
3495 local->hw.conf.channel->center_freq,
3496 sdata->u.sta.ssid, sdata->u.sta.ssid_len);
3497 if (!bss)
3498 return -ENOMEM;
3499
3500 bss->band = local->hw.conf.channel->band;
3501 sband = local->hw.wiphy->bands[bss->band];
3502
3503 if (local->hw.conf.beacon_int == 0)
3504 local->hw.conf.beacon_int = 10000;
3505 bss->beacon_int = local->hw.conf.beacon_int;
3506 bss->last_update = jiffies;
3507 bss->capability = WLAN_CAPABILITY_IBSS;
3508
3509 if (sdata->default_key)
3510 bss->capability |= WLAN_CAPABILITY_PRIVACY;
3511 else
3512 sdata->drop_unencrypted = 0;
3513
3514 bss->supp_rates_len = sband->n_bitrates;
3515 pos = bss->supp_rates;
3516 for (i = 0; i < sband->n_bitrates; i++) {
3517 int rate = sband->bitrates[i].bitrate;
3518 *pos++ = (u8) (rate / 5);
3519 }
3520
3521 return ieee80211_sta_join_ibss(dev, ifsta, bss);
3522 }
3523
3524
3525 static int ieee80211_sta_find_ibss(struct net_device *dev,
3526 struct ieee80211_if_sta *ifsta)
3527 {
3528 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3529 struct ieee80211_sta_bss *bss;
3530 int found = 0;
3531 u8 bssid[ETH_ALEN];
3532 int active_ibss;
3533 DECLARE_MAC_BUF(mac);
3534 DECLARE_MAC_BUF(mac2);
3535
3536 if (ifsta->ssid_len == 0)
3537 return -EINVAL;
3538
3539 active_ibss = ieee80211_sta_active_ibss(dev);
3540 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3541 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
3542 dev->name, active_ibss);
3543 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3544 spin_lock_bh(&local->sta_bss_lock);
3545 list_for_each_entry(bss, &local->sta_bss_list, list) {
3546 if (ifsta->ssid_len != bss->ssid_len ||
3547 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
3548 || !(bss->capability & WLAN_CAPABILITY_IBSS))
3549 continue;
3550 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3551 printk(KERN_DEBUG " bssid=%s found\n",
3552 print_mac(mac, bss->bssid));
3553 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3554 memcpy(bssid, bss->bssid, ETH_ALEN);
3555 found = 1;
3556 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
3557 break;
3558 }
3559 spin_unlock_bh(&local->sta_bss_lock);
3560
3561 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3562 printk(KERN_DEBUG " sta_find_ibss: selected %s current "
3563 "%s\n", print_mac(mac, bssid), print_mac(mac2, ifsta->bssid));
3564 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3565 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
3566 (bss = ieee80211_rx_bss_get(dev, bssid,
3567 local->hw.conf.channel->center_freq,
3568 ifsta->ssid, ifsta->ssid_len))) {
3569 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
3570 " based on configured SSID\n",
3571 dev->name, print_mac(mac, bssid));
3572 return ieee80211_sta_join_ibss(dev, ifsta, bss);
3573 }
3574 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3575 printk(KERN_DEBUG " did not try to join ibss\n");
3576 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3577
3578 /* Selected IBSS not found in current scan results - try to scan */
3579 if (ifsta->state == IEEE80211_IBSS_JOINED &&
3580 !ieee80211_sta_active_ibss(dev)) {
3581 mod_timer(&ifsta->timer, jiffies +
3582 IEEE80211_IBSS_MERGE_INTERVAL);
3583 } else if (time_after(jiffies, local->last_scan_completed +
3584 IEEE80211_SCAN_INTERVAL)) {
3585 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
3586 "join\n", dev->name);
3587 return ieee80211_sta_req_scan(dev, ifsta->ssid,
3588 ifsta->ssid_len);
3589 } else if (ifsta->state != IEEE80211_IBSS_JOINED) {
3590 int interval = IEEE80211_SCAN_INTERVAL;
3591
3592 if (time_after(jiffies, ifsta->ibss_join_req +
3593 IEEE80211_IBSS_JOIN_TIMEOUT)) {
3594 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
3595 (!(local->oper_channel->flags &
3596 IEEE80211_CHAN_NO_IBSS)))
3597 return ieee80211_sta_create_ibss(dev, ifsta);
3598 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
3599 printk(KERN_DEBUG "%s: IBSS not allowed on"
3600 " %d MHz\n", dev->name,
3601 local->hw.conf.channel->center_freq);
3602 }
3603
3604 /* No IBSS found - decrease scan interval and continue
3605 * scanning. */
3606 interval = IEEE80211_SCAN_INTERVAL_SLOW;
3607 }
3608
3609 ifsta->state = IEEE80211_IBSS_SEARCH;
3610 mod_timer(&ifsta->timer, jiffies + interval);
3611 return 0;
3612 }
3613
3614 return 0;
3615 }
3616
3617
3618 int ieee80211_sta_set_ssid(struct net_device *dev, char *ssid, size_t len)
3619 {
3620 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3621 struct ieee80211_if_sta *ifsta;
3622
3623 if (len > IEEE80211_MAX_SSID_LEN)
3624 return -EINVAL;
3625
3626 ifsta = &sdata->u.sta;
3627
3628 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0)
3629 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
3630 memcpy(ifsta->ssid, ssid, len);
3631 memset(ifsta->ssid + len, 0, IEEE80211_MAX_SSID_LEN - len);
3632 ifsta->ssid_len = len;
3633
3634 if (len)
3635 ifsta->flags |= IEEE80211_STA_SSID_SET;
3636 else
3637 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
3638 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3639 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
3640 ifsta->ibss_join_req = jiffies;
3641 ifsta->state = IEEE80211_IBSS_SEARCH;
3642 return ieee80211_sta_find_ibss(dev, ifsta);
3643 }
3644 return 0;
3645 }
3646
3647
3648 int ieee80211_sta_get_ssid(struct net_device *dev, char *ssid, size_t *len)
3649 {
3650 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3651 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3652 memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
3653 *len = ifsta->ssid_len;
3654 return 0;
3655 }
3656
3657
3658 int ieee80211_sta_set_bssid(struct net_device *dev, u8 *bssid)
3659 {
3660 struct ieee80211_sub_if_data *sdata;
3661 struct ieee80211_if_sta *ifsta;
3662 int res;
3663
3664 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3665 ifsta = &sdata->u.sta;
3666
3667 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3668 memcpy(ifsta->bssid, bssid, ETH_ALEN);
3669 res = ieee80211_if_config(dev);
3670 if (res) {
3671 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
3672 "the low-level driver\n", dev->name);
3673 return res;
3674 }
3675 }
3676
3677 if (is_valid_ether_addr(bssid))
3678 ifsta->flags |= IEEE80211_STA_BSSID_SET;
3679 else
3680 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
3681
3682 return 0;
3683 }
3684
3685
3686 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
3687 struct ieee80211_sub_if_data *sdata,
3688 int powersave)
3689 {
3690 struct sk_buff *skb;
3691 struct ieee80211_hdr *nullfunc;
3692 u16 fc;
3693
3694 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
3695 if (!skb) {
3696 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
3697 "frame\n", sdata->dev->name);
3698 return;
3699 }
3700 skb_reserve(skb, local->hw.extra_tx_headroom);
3701
3702 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
3703 memset(nullfunc, 0, 24);
3704 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
3705 IEEE80211_FCTL_TODS;
3706 if (powersave)
3707 fc |= IEEE80211_FCTL_PM;
3708 nullfunc->frame_control = cpu_to_le16(fc);
3709 memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
3710 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
3711 memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
3712
3713 ieee80211_sta_tx(sdata->dev, skb, 0);
3714 }
3715
3716
3717 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3718 {
3719 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
3720 ieee80211_vif_is_mesh(&sdata->vif))
3721 ieee80211_sta_timer((unsigned long)sdata);
3722 }
3723
3724 void ieee80211_scan_completed(struct ieee80211_hw *hw)
3725 {
3726 struct ieee80211_local *local = hw_to_local(hw);
3727 struct net_device *dev = local->scan_dev;
3728 struct ieee80211_sub_if_data *sdata;
3729 union iwreq_data wrqu;
3730
3731 local->last_scan_completed = jiffies;
3732 memset(&wrqu, 0, sizeof(wrqu));
3733 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
3734
3735 if (local->sta_hw_scanning) {
3736 local->sta_hw_scanning = 0;
3737 if (ieee80211_hw_config(local))
3738 printk(KERN_DEBUG "%s: failed to restore operational "
3739 "channel after scan\n", dev->name);
3740 /* Restart STA timer for HW scan case */
3741 rcu_read_lock();
3742 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3743 ieee80211_restart_sta_timer(sdata);
3744 rcu_read_unlock();
3745
3746 goto done;
3747 }
3748
3749 local->sta_sw_scanning = 0;
3750 if (ieee80211_hw_config(local))
3751 printk(KERN_DEBUG "%s: failed to restore operational "
3752 "channel after scan\n", dev->name);
3753
3754
3755 netif_tx_lock_bh(local->mdev);
3756 local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
3757 local->ops->configure_filter(local_to_hw(local),
3758 FIF_BCN_PRBRESP_PROMISC,
3759 &local->filter_flags,
3760 local->mdev->mc_count,
3761 local->mdev->mc_list);
3762
3763 netif_tx_unlock_bh(local->mdev);
3764
3765 rcu_read_lock();
3766 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3767
3768 /* No need to wake the master device. */
3769 if (sdata->dev == local->mdev)
3770 continue;
3771
3772 /* Tell AP we're back */
3773 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
3774 sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED)
3775 ieee80211_send_nullfunc(local, sdata, 0);
3776
3777 ieee80211_restart_sta_timer(sdata);
3778
3779 netif_wake_queue(sdata->dev);
3780 }
3781 rcu_read_unlock();
3782
3783 done:
3784 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3785 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
3786 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3787 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
3788 (!ifsta->state == IEEE80211_IBSS_JOINED &&
3789 !ieee80211_sta_active_ibss(dev)))
3790 ieee80211_sta_find_ibss(dev, ifsta);
3791 }
3792 }
3793 EXPORT_SYMBOL(ieee80211_scan_completed);
3794
3795 void ieee80211_sta_scan_work(struct work_struct *work)
3796 {
3797 struct ieee80211_local *local =
3798 container_of(work, struct ieee80211_local, scan_work.work);
3799 struct net_device *dev = local->scan_dev;
3800 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3801 struct ieee80211_supported_band *sband;
3802 struct ieee80211_channel *chan;
3803 int skip;
3804 unsigned long next_delay = 0;
3805
3806 if (!local->sta_sw_scanning)
3807 return;
3808
3809 switch (local->scan_state) {
3810 case SCAN_SET_CHANNEL:
3811 /*
3812 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
3813 * after we successfully scanned the last channel of the last
3814 * band (and the last band is supported by the hw)
3815 */
3816 if (local->scan_band < IEEE80211_NUM_BANDS)
3817 sband = local->hw.wiphy->bands[local->scan_band];
3818 else
3819 sband = NULL;
3820
3821 /*
3822 * If we are at an unsupported band and have more bands
3823 * left to scan, advance to the next supported one.
3824 */
3825 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
3826 local->scan_band++;
3827 sband = local->hw.wiphy->bands[local->scan_band];
3828 local->scan_channel_idx = 0;
3829 }
3830
3831 /* if no more bands/channels left, complete scan */
3832 if (!sband || local->scan_channel_idx >= sband->n_channels) {
3833 ieee80211_scan_completed(local_to_hw(local));
3834 return;
3835 }
3836 skip = 0;
3837 chan = &sband->channels[local->scan_channel_idx];
3838
3839 if (chan->flags & IEEE80211_CHAN_DISABLED ||
3840 (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3841 chan->flags & IEEE80211_CHAN_NO_IBSS))
3842 skip = 1;
3843
3844 if (!skip) {
3845 local->scan_channel = chan;
3846 if (ieee80211_hw_config(local)) {
3847 printk(KERN_DEBUG "%s: failed to set freq to "
3848 "%d MHz for scan\n", dev->name,
3849 chan->center_freq);
3850 skip = 1;
3851 }
3852 }
3853
3854 /* advance state machine to next channel/band */
3855 local->scan_channel_idx++;
3856 if (local->scan_channel_idx >= sband->n_channels) {
3857 /*
3858 * scan_band may end up == IEEE80211_NUM_BANDS, but
3859 * we'll catch that case above and complete the scan
3860 * if that is the case.
3861 */
3862 local->scan_band++;
3863 local->scan_channel_idx = 0;
3864 }
3865
3866 if (skip)
3867 break;
3868
3869 next_delay = IEEE80211_PROBE_DELAY +
3870 usecs_to_jiffies(local->hw.channel_change_time);
3871 local->scan_state = SCAN_SEND_PROBE;
3872 break;
3873 case SCAN_SEND_PROBE:
3874 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
3875 local->scan_state = SCAN_SET_CHANNEL;
3876
3877 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
3878 break;
3879 ieee80211_send_probe_req(dev, NULL, local->scan_ssid,
3880 local->scan_ssid_len);
3881 next_delay = IEEE80211_CHANNEL_TIME;
3882 break;
3883 }
3884
3885 if (local->sta_sw_scanning)
3886 queue_delayed_work(local->hw.workqueue, &local->scan_work,
3887 next_delay);
3888 }
3889
3890
3891 static int ieee80211_sta_start_scan(struct net_device *dev,
3892 u8 *ssid, size_t ssid_len)
3893 {
3894 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3895 struct ieee80211_sub_if_data *sdata;
3896
3897 if (ssid_len > IEEE80211_MAX_SSID_LEN)
3898 return -EINVAL;
3899
3900 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
3901 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
3902 * BSSID: MACAddress
3903 * SSID
3904 * ScanType: ACTIVE, PASSIVE
3905 * ProbeDelay: delay (in microseconds) to be used prior to transmitting
3906 * a Probe frame during active scanning
3907 * ChannelList
3908 * MinChannelTime (>= ProbeDelay), in TU
3909 * MaxChannelTime: (>= MinChannelTime), in TU
3910 */
3911
3912 /* MLME-SCAN.confirm
3913 * BSSDescriptionSet
3914 * ResultCode: SUCCESS, INVALID_PARAMETERS
3915 */
3916
3917 if (local->sta_sw_scanning || local->sta_hw_scanning) {
3918 if (local->scan_dev == dev)
3919 return 0;
3920 return -EBUSY;
3921 }
3922
3923 if (local->ops->hw_scan) {
3924 int rc = local->ops->hw_scan(local_to_hw(local),
3925 ssid, ssid_len);
3926 if (!rc) {
3927 local->sta_hw_scanning = 1;
3928 local->scan_dev = dev;
3929 }
3930 return rc;
3931 }
3932
3933 local->sta_sw_scanning = 1;
3934
3935 rcu_read_lock();
3936 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3937
3938 /* Don't stop the master interface, otherwise we can't transmit
3939 * probes! */
3940 if (sdata->dev == local->mdev)
3941 continue;
3942
3943 netif_stop_queue(sdata->dev);
3944 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
3945 (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED))
3946 ieee80211_send_nullfunc(local, sdata, 1);
3947 }
3948 rcu_read_unlock();
3949
3950 if (ssid) {
3951 local->scan_ssid_len = ssid_len;
3952 memcpy(local->scan_ssid, ssid, ssid_len);
3953 } else
3954 local->scan_ssid_len = 0;
3955 local->scan_state = SCAN_SET_CHANNEL;
3956 local->scan_channel_idx = 0;
3957 local->scan_band = IEEE80211_BAND_2GHZ;
3958 local->scan_dev = dev;
3959
3960 netif_tx_lock_bh(local->mdev);
3961 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
3962 local->ops->configure_filter(local_to_hw(local),
3963 FIF_BCN_PRBRESP_PROMISC,
3964 &local->filter_flags,
3965 local->mdev->mc_count,
3966 local->mdev->mc_list);
3967 netif_tx_unlock_bh(local->mdev);
3968
3969 /* TODO: start scan as soon as all nullfunc frames are ACKed */
3970 queue_delayed_work(local->hw.workqueue, &local->scan_work,
3971 IEEE80211_CHANNEL_TIME);
3972
3973 return 0;
3974 }
3975
3976
3977 int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len)
3978 {
3979 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3980 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3981 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3982
3983 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3984 return ieee80211_sta_start_scan(dev, ssid, ssid_len);
3985
3986 if (local->sta_sw_scanning || local->sta_hw_scanning) {
3987 if (local->scan_dev == dev)
3988 return 0;
3989 return -EBUSY;
3990 }
3991
3992 ifsta->scan_ssid_len = ssid_len;
3993 if (ssid_len)
3994 memcpy(ifsta->scan_ssid, ssid, ssid_len);
3995 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
3996 queue_work(local->hw.workqueue, &ifsta->work);
3997 return 0;
3998 }
3999
4000 static char *
4001 ieee80211_sta_scan_result(struct net_device *dev,
4002 struct ieee80211_sta_bss *bss,
4003 char *current_ev, char *end_buf)
4004 {
4005 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4006 struct iw_event iwe;
4007
4008 if (time_after(jiffies,
4009 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
4010 return current_ev;
4011
4012 memset(&iwe, 0, sizeof(iwe));
4013 iwe.cmd = SIOCGIWAP;
4014 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
4015 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
4016 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
4017 IW_EV_ADDR_LEN);
4018
4019 memset(&iwe, 0, sizeof(iwe));
4020 iwe.cmd = SIOCGIWESSID;
4021 if (bss_mesh_cfg(bss)) {
4022 iwe.u.data.length = bss_mesh_id_len(bss);
4023 iwe.u.data.flags = 1;
4024 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
4025 bss_mesh_id(bss));
4026 } else {
4027 iwe.u.data.length = bss->ssid_len;
4028 iwe.u.data.flags = 1;
4029 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
4030 bss->ssid);
4031 }
4032
4033 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
4034 || bss_mesh_cfg(bss)) {
4035 memset(&iwe, 0, sizeof(iwe));
4036 iwe.cmd = SIOCGIWMODE;
4037 if (bss_mesh_cfg(bss))
4038 iwe.u.mode = IW_MODE_MESH;
4039 else if (bss->capability & WLAN_CAPABILITY_ESS)
4040 iwe.u.mode = IW_MODE_MASTER;
4041 else
4042 iwe.u.mode = IW_MODE_ADHOC;
4043 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
4044 IW_EV_UINT_LEN);
4045 }
4046
4047 memset(&iwe, 0, sizeof(iwe));
4048 iwe.cmd = SIOCGIWFREQ;
4049 iwe.u.freq.m = bss->freq;
4050 iwe.u.freq.e = 6;
4051 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
4052 IW_EV_FREQ_LEN);
4053
4054 memset(&iwe, 0, sizeof(iwe));
4055 iwe.cmd = SIOCGIWFREQ;
4056 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
4057 iwe.u.freq.e = 0;
4058 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
4059 IW_EV_FREQ_LEN);
4060
4061 memset(&iwe, 0, sizeof(iwe));
4062 iwe.cmd = IWEVQUAL;
4063 iwe.u.qual.qual = bss->qual;
4064 iwe.u.qual.level = bss->signal;
4065 iwe.u.qual.noise = bss->noise;
4066 iwe.u.qual.updated = local->wstats_flags;
4067 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
4068 IW_EV_QUAL_LEN);
4069
4070 memset(&iwe, 0, sizeof(iwe));
4071 iwe.cmd = SIOCGIWENCODE;
4072 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
4073 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
4074 else
4075 iwe.u.data.flags = IW_ENCODE_DISABLED;
4076 iwe.u.data.length = 0;
4077 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, "");
4078
4079 if (bss && bss->wpa_ie) {
4080 memset(&iwe, 0, sizeof(iwe));
4081 iwe.cmd = IWEVGENIE;
4082 iwe.u.data.length = bss->wpa_ie_len;
4083 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
4084 bss->wpa_ie);
4085 }
4086
4087 if (bss && bss->rsn_ie) {
4088 memset(&iwe, 0, sizeof(iwe));
4089 iwe.cmd = IWEVGENIE;
4090 iwe.u.data.length = bss->rsn_ie_len;
4091 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
4092 bss->rsn_ie);
4093 }
4094
4095 if (bss && bss->supp_rates_len > 0) {
4096 /* display all supported rates in readable format */
4097 char *p = current_ev + IW_EV_LCP_LEN;
4098 int i;
4099
4100 memset(&iwe, 0, sizeof(iwe));
4101 iwe.cmd = SIOCGIWRATE;
4102 /* Those two flags are ignored... */
4103 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
4104
4105 for (i = 0; i < bss->supp_rates_len; i++) {
4106 iwe.u.bitrate.value = ((bss->supp_rates[i] &
4107 0x7f) * 500000);
4108 p = iwe_stream_add_value(current_ev, p,
4109 end_buf, &iwe, IW_EV_PARAM_LEN);
4110 }
4111 current_ev = p;
4112 }
4113
4114 if (bss) {
4115 char *buf;
4116 buf = kmalloc(30, GFP_ATOMIC);
4117 if (buf) {
4118 memset(&iwe, 0, sizeof(iwe));
4119 iwe.cmd = IWEVCUSTOM;
4120 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
4121 iwe.u.data.length = strlen(buf);
4122 current_ev = iwe_stream_add_point(current_ev, end_buf,
4123 &iwe, buf);
4124 kfree(buf);
4125 }
4126 }
4127
4128 if (bss_mesh_cfg(bss)) {
4129 char *buf;
4130 u8 *cfg = bss_mesh_cfg(bss);
4131 buf = kmalloc(50, GFP_ATOMIC);
4132 if (buf) {
4133 memset(&iwe, 0, sizeof(iwe));
4134 iwe.cmd = IWEVCUSTOM;
4135 sprintf(buf, "Mesh network (version %d)", cfg[0]);
4136 iwe.u.data.length = strlen(buf);
4137 current_ev = iwe_stream_add_point(current_ev, end_buf,
4138 &iwe, buf);
4139 sprintf(buf, "Path Selection Protocol ID: "
4140 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
4141 cfg[4]);
4142 iwe.u.data.length = strlen(buf);
4143 current_ev = iwe_stream_add_point(current_ev, end_buf,
4144 &iwe, buf);
4145 sprintf(buf, "Path Selection Metric ID: "
4146 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
4147 cfg[8]);
4148 iwe.u.data.length = strlen(buf);
4149 current_ev = iwe_stream_add_point(current_ev, end_buf,
4150 &iwe, buf);
4151 sprintf(buf, "Congestion Control Mode ID: "
4152 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
4153 cfg[11], cfg[12]);
4154 iwe.u.data.length = strlen(buf);
4155 current_ev = iwe_stream_add_point(current_ev, end_buf,
4156 &iwe, buf);
4157 sprintf(buf, "Channel Precedence: "
4158 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
4159 cfg[15], cfg[16]);
4160 iwe.u.data.length = strlen(buf);
4161 current_ev = iwe_stream_add_point(current_ev, end_buf,
4162 &iwe, buf);
4163 kfree(buf);
4164 }
4165 }
4166
4167 return current_ev;
4168 }
4169
4170
4171 int ieee80211_sta_scan_results(struct net_device *dev, char *buf, size_t len)
4172 {
4173 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4174 char *current_ev = buf;
4175 char *end_buf = buf + len;
4176 struct ieee80211_sta_bss *bss;
4177
4178 spin_lock_bh(&local->sta_bss_lock);
4179 list_for_each_entry(bss, &local->sta_bss_list, list) {
4180 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
4181 spin_unlock_bh(&local->sta_bss_lock);
4182 return -E2BIG;
4183 }
4184 current_ev = ieee80211_sta_scan_result(dev, bss, current_ev,
4185 end_buf);
4186 }
4187 spin_unlock_bh(&local->sta_bss_lock);
4188 return current_ev - buf;
4189 }
4190
4191
4192 int ieee80211_sta_set_extra_ie(struct net_device *dev, char *ie, size_t len)
4193 {
4194 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4195 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4196
4197 kfree(ifsta->extra_ie);
4198 if (len == 0) {
4199 ifsta->extra_ie = NULL;
4200 ifsta->extra_ie_len = 0;
4201 return 0;
4202 }
4203 ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
4204 if (!ifsta->extra_ie) {
4205 ifsta->extra_ie_len = 0;
4206 return -ENOMEM;
4207 }
4208 memcpy(ifsta->extra_ie, ie, len);
4209 ifsta->extra_ie_len = len;
4210 return 0;
4211 }
4212
4213
4214 struct sta_info *ieee80211_ibss_add_sta(struct net_device *dev,
4215 struct sk_buff *skb, u8 *bssid,
4216 u8 *addr)
4217 {
4218 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4219 struct sta_info *sta;
4220 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4221 DECLARE_MAC_BUF(mac);
4222
4223 /* TODO: Could consider removing the least recently used entry and
4224 * allow new one to be added. */
4225 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
4226 if (net_ratelimit()) {
4227 printk(KERN_DEBUG "%s: No room for a new IBSS STA "
4228 "entry %s\n", dev->name, print_mac(mac, addr));
4229 }
4230 return NULL;
4231 }
4232
4233 printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
4234 wiphy_name(local->hw.wiphy), print_mac(mac, addr), dev->name);
4235
4236 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
4237 if (!sta)
4238 return NULL;
4239
4240 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
4241
4242 sta->supp_rates[local->hw.conf.channel->band] =
4243 sdata->u.sta.supp_rates_bits[local->hw.conf.channel->band];
4244
4245 rate_control_rate_init(sta, local);
4246
4247 if (sta_info_insert(sta))
4248 return NULL;
4249
4250 return sta;
4251 }
4252
4253
4254 int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason)
4255 {
4256 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4257 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4258
4259 printk(KERN_DEBUG "%s: deauthenticate(reason=%d)\n",
4260 dev->name, reason);
4261
4262 if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
4263 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
4264 return -EINVAL;
4265
4266 ieee80211_send_deauth(dev, ifsta, reason);
4267 ieee80211_set_disassoc(dev, ifsta, 1);
4268 return 0;
4269 }
4270
4271
4272 int ieee80211_sta_disassociate(struct net_device *dev, u16 reason)
4273 {
4274 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4275 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4276
4277 printk(KERN_DEBUG "%s: disassociate(reason=%d)\n",
4278 dev->name, reason);
4279
4280 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4281 return -EINVAL;
4282
4283 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
4284 return -1;
4285
4286 ieee80211_send_disassoc(dev, ifsta, reason);
4287 ieee80211_set_disassoc(dev, ifsta, 0);
4288 return 0;
4289 }
4290
4291 void ieee80211_notify_mac(struct ieee80211_hw *hw,
4292 enum ieee80211_notification_types notif_type)
4293 {
4294 struct ieee80211_local *local = hw_to_local(hw);
4295 struct ieee80211_sub_if_data *sdata;
4296
4297 switch (notif_type) {
4298 case IEEE80211_NOTIFY_RE_ASSOC:
4299 rcu_read_lock();
4300 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4301
4302 if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
4303 ieee80211_sta_req_auth(sdata->dev,
4304 &sdata->u.sta);
4305 }
4306
4307 }
4308 rcu_read_unlock();
4309 break;
4310 }
4311 }
4312 EXPORT_SYMBOL(ieee80211_notify_mac);
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