2 * Scanning implementation
4 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
16 * order BSS list by RSSI(?) ("quality of AP")
17 * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
21 #include <linux/wireless.h>
22 #include <linux/if_arp.h>
23 #include <net/mac80211.h>
24 #include <net/iw_handler.h>
26 #include "ieee80211_i.h"
29 #define IEEE80211_PROBE_DELAY (HZ / 33)
30 #define IEEE80211_CHANNEL_TIME (HZ / 33)
31 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
33 void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
35 spin_lock_init(&local->sta_bss_lock);
36 INIT_LIST_HEAD(&local->sta_bss_list);
39 void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
41 struct ieee80211_sta_bss *bss, *tmp;
43 list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
44 ieee80211_rx_bss_put(local, bss);
47 struct ieee80211_sta_bss *
48 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
49 u8 *ssid, u8 ssid_len)
51 struct ieee80211_sta_bss *bss;
53 spin_lock_bh(&local->sta_bss_lock);
54 bss = local->sta_bss_hash[STA_HASH(bssid)];
56 if (!bss_mesh_cfg(bss) &&
57 !memcmp(bss->bssid, bssid, ETH_ALEN) &&
59 bss->ssid_len == ssid_len &&
60 (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
61 atomic_inc(&bss->users);
66 spin_unlock_bh(&local->sta_bss_lock);
70 /* Caller must hold local->sta_bss_lock */
71 static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
72 struct ieee80211_sta_bss *bss)
76 if (bss_mesh_cfg(bss))
77 hash_idx = mesh_id_hash(bss_mesh_id(bss),
78 bss_mesh_id_len(bss));
80 hash_idx = STA_HASH(bss->bssid);
82 bss->hnext = local->sta_bss_hash[hash_idx];
83 local->sta_bss_hash[hash_idx] = bss;
86 /* Caller must hold local->sta_bss_lock */
87 static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
88 struct ieee80211_sta_bss *bss)
90 struct ieee80211_sta_bss *b, *prev = NULL;
91 b = local->sta_bss_hash[STA_HASH(bss->bssid)];
95 local->sta_bss_hash[STA_HASH(bss->bssid)] =
98 prev->hnext = bss->hnext;
106 struct ieee80211_sta_bss *
107 ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq,
108 u8 *ssid, u8 ssid_len)
110 struct ieee80211_sta_bss *bss;
112 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
115 atomic_set(&bss->users, 2);
116 memcpy(bss->bssid, bssid, ETH_ALEN);
118 if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
119 memcpy(bss->ssid, ssid, ssid_len);
120 bss->ssid_len = ssid_len;
123 spin_lock_bh(&local->sta_bss_lock);
124 /* TODO: order by RSSI? */
125 list_add_tail(&bss->list, &local->sta_bss_list);
126 __ieee80211_rx_bss_hash_add(local, bss);
127 spin_unlock_bh(&local->sta_bss_lock);
131 #ifdef CONFIG_MAC80211_MESH
132 static struct ieee80211_sta_bss *
133 ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
134 u8 *mesh_cfg, int freq)
136 struct ieee80211_sta_bss *bss;
138 spin_lock_bh(&local->sta_bss_lock);
139 bss = local->sta_bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
141 if (bss_mesh_cfg(bss) &&
142 !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
144 mesh_id_len == bss->mesh_id_len &&
145 (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
147 atomic_inc(&bss->users);
152 spin_unlock_bh(&local->sta_bss_lock);
156 static struct ieee80211_sta_bss *
157 ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
158 u8 *mesh_cfg, int mesh_config_len, int freq)
160 struct ieee80211_sta_bss *bss;
162 if (mesh_config_len != MESH_CFG_LEN)
165 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
169 bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
170 if (!bss->mesh_cfg) {
175 if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
176 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
178 kfree(bss->mesh_cfg);
182 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
185 atomic_set(&bss->users, 2);
186 memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
187 bss->mesh_id_len = mesh_id_len;
189 spin_lock_bh(&local->sta_bss_lock);
190 /* TODO: order by RSSI? */
191 list_add_tail(&bss->list, &local->sta_bss_list);
192 __ieee80211_rx_bss_hash_add(local, bss);
193 spin_unlock_bh(&local->sta_bss_lock);
198 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
201 kfree(bss_mesh_id(bss));
202 kfree(bss_mesh_cfg(bss));
206 void ieee80211_rx_bss_put(struct ieee80211_local *local,
207 struct ieee80211_sta_bss *bss)
210 if (!atomic_dec_and_lock(&bss->users, &local->sta_bss_lock)) {
215 __ieee80211_rx_bss_hash_del(local, bss);
216 list_del(&bss->list);
217 spin_unlock_bh(&local->sta_bss_lock);
218 ieee80211_rx_bss_free(bss);
221 struct ieee80211_sta_bss *
222 ieee80211_bss_info_update(struct ieee80211_local *local,
223 struct ieee80211_rx_status *rx_status,
224 struct ieee80211_mgmt *mgmt,
226 struct ieee802_11_elems *elems,
227 int freq, bool beacon)
229 struct ieee80211_sta_bss *bss;
232 #ifdef CONFIG_MAC80211_MESH
233 if (elems->mesh_config)
234 bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id,
235 elems->mesh_id_len, elems->mesh_config, freq);
238 bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq,
239 elems->ssid, elems->ssid_len);
241 #ifdef CONFIG_MAC80211_MESH
242 if (elems->mesh_config)
243 bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id,
244 elems->mesh_id_len, elems->mesh_config,
245 elems->mesh_config_len, freq);
248 bss = ieee80211_rx_bss_add(local, mgmt->bssid, freq,
249 elems->ssid, elems->ssid_len);
254 /* TODO: order by RSSI? */
255 spin_lock_bh(&local->sta_bss_lock);
256 list_move_tail(&bss->list, &local->sta_bss_list);
257 spin_unlock_bh(&local->sta_bss_lock);
261 /* save the ERP value so that it is available at association time */
262 if (elems->erp_info && elems->erp_info_len >= 1) {
263 bss->erp_value = elems->erp_info[0];
264 bss->has_erp_value = 1;
267 bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
268 bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
271 struct ieee80211_tim_ie *tim_ie =
272 (struct ieee80211_tim_ie *)elems->tim;
273 bss->dtim_period = tim_ie->dtim_period;
276 /* set default value for buggy APs */
277 if (!elems->tim || bss->dtim_period == 0)
278 bss->dtim_period = 1;
280 bss->supp_rates_len = 0;
281 if (elems->supp_rates) {
282 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
283 if (clen > elems->supp_rates_len)
284 clen = elems->supp_rates_len;
285 memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates,
287 bss->supp_rates_len += clen;
289 if (elems->ext_supp_rates) {
290 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
291 if (clen > elems->ext_supp_rates_len)
292 clen = elems->ext_supp_rates_len;
293 memcpy(&bss->supp_rates[bss->supp_rates_len],
294 elems->ext_supp_rates, clen);
295 bss->supp_rates_len += clen;
298 bss->band = rx_status->band;
300 bss->timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
301 bss->last_update = jiffies;
302 bss->signal = rx_status->signal;
303 bss->noise = rx_status->noise;
304 bss->qual = rx_status->qual;
305 bss->wmm_used = elems->wmm_param || elems->wmm_info;
308 bss->last_probe_resp = jiffies;
311 * For probe responses, or if we don't have any information yet,
312 * use the IEs from the beacon.
314 if (!bss->ies || !beacon) {
315 if (bss->ies == NULL || bss->ies_len < elems->total_len) {
317 bss->ies = kmalloc(elems->total_len, GFP_ATOMIC);
320 memcpy(bss->ies, elems->ie_start, elems->total_len);
321 bss->ies_len = elems->total_len;
330 ieee80211_sta_rx_scan(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
331 struct ieee80211_rx_status *rx_status)
333 struct ieee80211_mgmt *mgmt;
334 struct ieee80211_sta_bss *bss;
336 struct ieee80211_channel *channel;
340 bool presp, beacon = false;
341 struct ieee802_11_elems elems;
344 return RX_DROP_UNUSABLE;
346 mgmt = (struct ieee80211_mgmt *) skb->data;
347 fc = mgmt->frame_control;
349 if (ieee80211_is_ctl(fc))
353 return RX_DROP_MONITOR;
355 presp = ieee80211_is_probe_resp(fc);
357 /* ignore ProbeResp to foreign address */
358 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
359 return RX_DROP_MONITOR;
362 elements = mgmt->u.probe_resp.variable;
363 baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
365 beacon = ieee80211_is_beacon(fc);
366 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
367 elements = mgmt->u.beacon.variable;
370 if (!presp && !beacon)
373 if (baselen > skb->len)
374 return RX_DROP_MONITOR;
376 ieee802_11_parse_elems(elements, skb->len - baselen, &elems);
378 if (elems.ds_params && elems.ds_params_len == 1)
379 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
381 freq = rx_status->freq;
383 channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
385 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
386 return RX_DROP_MONITOR;
388 bss = ieee80211_bss_info_update(sdata->local, rx_status,
389 mgmt, skb->len, &elems,
391 ieee80211_rx_bss_put(sdata->local, bss);
397 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
398 struct ieee80211_sub_if_data *sdata,
402 struct ieee80211_hdr *nullfunc;
405 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
407 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
408 "frame\n", sdata->dev->name);
411 skb_reserve(skb, local->hw.extra_tx_headroom);
413 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
414 memset(nullfunc, 0, 24);
415 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
416 IEEE80211_FCTL_TODS);
418 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
419 nullfunc->frame_control = fc;
420 memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
421 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
422 memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
424 ieee80211_tx_skb(sdata, skb, 0);
427 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
429 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
430 ieee80211_vif_is_mesh(&sdata->vif))
431 ieee80211_sta_timer((unsigned long)sdata);
434 void ieee80211_scan_completed(struct ieee80211_hw *hw)
436 struct ieee80211_local *local = hw_to_local(hw);
437 struct ieee80211_sub_if_data *sdata;
438 union iwreq_data wrqu;
440 local->last_scan_completed = jiffies;
441 memset(&wrqu, 0, sizeof(wrqu));
442 wireless_send_event(local->scan_sdata->dev, SIOCGIWSCAN, &wrqu, NULL);
444 if (local->sta_hw_scanning) {
445 local->sta_hw_scanning = 0;
446 if (ieee80211_hw_config(local))
447 printk(KERN_DEBUG "%s: failed to restore operational "
448 "channel after scan\n", wiphy_name(local->hw.wiphy));
449 /* Restart STA timer for HW scan case */
451 list_for_each_entry_rcu(sdata, &local->interfaces, list)
452 ieee80211_restart_sta_timer(sdata);
458 local->sta_sw_scanning = 0;
459 if (ieee80211_hw_config(local))
460 printk(KERN_DEBUG "%s: failed to restore operational "
461 "channel after scan\n", wiphy_name(local->hw.wiphy));
464 netif_tx_lock_bh(local->mdev);
465 netif_addr_lock(local->mdev);
466 local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
467 local->ops->configure_filter(local_to_hw(local),
468 FIF_BCN_PRBRESP_PROMISC,
469 &local->filter_flags,
470 local->mdev->mc_count,
471 local->mdev->mc_list);
473 netif_addr_unlock(local->mdev);
474 netif_tx_unlock_bh(local->mdev);
477 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
478 /* Tell AP we're back */
479 if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
480 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
481 ieee80211_send_nullfunc(local, sdata, 0);
482 netif_tx_wake_all_queues(sdata->dev);
485 netif_tx_wake_all_queues(sdata->dev);
487 ieee80211_restart_sta_timer(sdata);
492 ieee80211_mlme_notify_scan_completed(local);
494 EXPORT_SYMBOL(ieee80211_scan_completed);
497 void ieee80211_sta_scan_work(struct work_struct *work)
499 struct ieee80211_local *local =
500 container_of(work, struct ieee80211_local, scan_work.work);
501 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
502 struct ieee80211_supported_band *sband;
503 struct ieee80211_channel *chan;
505 unsigned long next_delay = 0;
507 if (!local->sta_sw_scanning)
510 switch (local->scan_state) {
511 case SCAN_SET_CHANNEL:
513 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
514 * after we successfully scanned the last channel of the last
515 * band (and the last band is supported by the hw)
517 if (local->scan_band < IEEE80211_NUM_BANDS)
518 sband = local->hw.wiphy->bands[local->scan_band];
523 * If we are at an unsupported band and have more bands
524 * left to scan, advance to the next supported one.
526 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
528 sband = local->hw.wiphy->bands[local->scan_band];
529 local->scan_channel_idx = 0;
532 /* if no more bands/channels left, complete scan */
533 if (!sband || local->scan_channel_idx >= sband->n_channels) {
534 ieee80211_scan_completed(local_to_hw(local));
538 chan = &sband->channels[local->scan_channel_idx];
540 if (chan->flags & IEEE80211_CHAN_DISABLED ||
541 (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
542 chan->flags & IEEE80211_CHAN_NO_IBSS))
546 local->scan_channel = chan;
547 if (ieee80211_hw_config(local)) {
548 printk(KERN_DEBUG "%s: failed to set freq to "
549 "%d MHz for scan\n", wiphy_name(local->hw.wiphy),
555 /* advance state machine to next channel/band */
556 local->scan_channel_idx++;
557 if (local->scan_channel_idx >= sband->n_channels) {
559 * scan_band may end up == IEEE80211_NUM_BANDS, but
560 * we'll catch that case above and complete the scan
561 * if that is the case.
564 local->scan_channel_idx = 0;
570 next_delay = IEEE80211_PROBE_DELAY +
571 usecs_to_jiffies(local->hw.channel_change_time);
572 local->scan_state = SCAN_SEND_PROBE;
574 case SCAN_SEND_PROBE:
575 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
576 local->scan_state = SCAN_SET_CHANNEL;
578 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
580 ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
581 local->scan_ssid_len);
582 next_delay = IEEE80211_CHANNEL_TIME;
586 if (local->sta_sw_scanning)
587 queue_delayed_work(local->hw.workqueue, &local->scan_work,
592 int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata,
593 u8 *ssid, size_t ssid_len)
595 struct ieee80211_local *local = scan_sdata->local;
596 struct ieee80211_sub_if_data *sdata;
598 if (ssid_len > IEEE80211_MAX_SSID_LEN)
601 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
602 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
605 * ScanType: ACTIVE, PASSIVE
606 * ProbeDelay: delay (in microseconds) to be used prior to transmitting
607 * a Probe frame during active scanning
609 * MinChannelTime (>= ProbeDelay), in TU
610 * MaxChannelTime: (>= MinChannelTime), in TU
615 * ResultCode: SUCCESS, INVALID_PARAMETERS
618 if (local->sta_sw_scanning || local->sta_hw_scanning) {
619 if (local->scan_sdata == scan_sdata)
624 if (local->ops->hw_scan) {
625 int rc = local->ops->hw_scan(local_to_hw(local),
628 local->sta_hw_scanning = 1;
629 local->scan_sdata = scan_sdata;
634 local->sta_sw_scanning = 1;
637 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
638 if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
639 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
640 netif_tx_stop_all_queues(sdata->dev);
641 ieee80211_send_nullfunc(local, sdata, 1);
644 netif_tx_stop_all_queues(sdata->dev);
649 local->scan_ssid_len = ssid_len;
650 memcpy(local->scan_ssid, ssid, ssid_len);
652 local->scan_ssid_len = 0;
653 local->scan_state = SCAN_SET_CHANNEL;
654 local->scan_channel_idx = 0;
655 local->scan_band = IEEE80211_BAND_2GHZ;
656 local->scan_sdata = scan_sdata;
658 netif_addr_lock_bh(local->mdev);
659 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
660 local->ops->configure_filter(local_to_hw(local),
661 FIF_BCN_PRBRESP_PROMISC,
662 &local->filter_flags,
663 local->mdev->mc_count,
664 local->mdev->mc_list);
665 netif_addr_unlock_bh(local->mdev);
667 /* TODO: start scan as soon as all nullfunc frames are ACKed */
668 queue_delayed_work(local->hw.workqueue, &local->scan_work,
669 IEEE80211_CHANNEL_TIME);
675 int ieee80211_sta_req_scan(struct ieee80211_sub_if_data *sdata, u8 *ssid, size_t ssid_len)
677 struct ieee80211_local *local = sdata->local;
678 struct ieee80211_if_sta *ifsta;
680 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
681 return ieee80211_sta_start_scan(sdata, ssid, ssid_len);
684 * STA has a state machine that might need to defer scanning
685 * while it's trying to associate/authenticate, therefore we
686 * queue it up to the state machine in that case.
689 if (local->sta_sw_scanning || local->sta_hw_scanning) {
690 if (local->scan_sdata == sdata)
695 ifsta = &sdata->u.sta;
697 ifsta->scan_ssid_len = ssid_len;
699 memcpy(ifsta->scan_ssid, ssid, ssid_len);
700 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
701 queue_work(local->hw.workqueue, &ifsta->work);
707 static void ieee80211_sta_add_scan_ies(struct iw_request_info *info,
708 struct ieee80211_sta_bss *bss,
709 char **current_ev, char *end_buf)
711 u8 *pos, *end, *next;
714 if (bss == NULL || bss->ies == NULL)
718 * If needed, fragment the IEs buffer (at IE boundaries) into short
719 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
722 end = pos + bss->ies_len;
724 while (end - pos > IW_GENERIC_IE_MAX) {
725 next = pos + 2 + pos[1];
726 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
727 next = next + 2 + next[1];
729 memset(&iwe, 0, sizeof(iwe));
731 iwe.u.data.length = next - pos;
732 *current_ev = iwe_stream_add_point(info, *current_ev,
739 memset(&iwe, 0, sizeof(iwe));
741 iwe.u.data.length = end - pos;
742 *current_ev = iwe_stream_add_point(info, *current_ev,
749 ieee80211_sta_scan_result(struct ieee80211_local *local,
750 struct iw_request_info *info,
751 struct ieee80211_sta_bss *bss,
752 char *current_ev, char *end_buf)
757 if (time_after(jiffies,
758 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
761 memset(&iwe, 0, sizeof(iwe));
763 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
764 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
765 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
768 memset(&iwe, 0, sizeof(iwe));
769 iwe.cmd = SIOCGIWESSID;
770 if (bss_mesh_cfg(bss)) {
771 iwe.u.data.length = bss_mesh_id_len(bss);
772 iwe.u.data.flags = 1;
773 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
774 &iwe, bss_mesh_id(bss));
776 iwe.u.data.length = bss->ssid_len;
777 iwe.u.data.flags = 1;
778 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
782 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
783 || bss_mesh_cfg(bss)) {
784 memset(&iwe, 0, sizeof(iwe));
785 iwe.cmd = SIOCGIWMODE;
786 if (bss_mesh_cfg(bss))
787 iwe.u.mode = IW_MODE_MESH;
788 else if (bss->capability & WLAN_CAPABILITY_ESS)
789 iwe.u.mode = IW_MODE_MASTER;
791 iwe.u.mode = IW_MODE_ADHOC;
792 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
793 &iwe, IW_EV_UINT_LEN);
796 memset(&iwe, 0, sizeof(iwe));
797 iwe.cmd = SIOCGIWFREQ;
798 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
800 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
803 memset(&iwe, 0, sizeof(iwe));
804 iwe.cmd = SIOCGIWFREQ;
805 iwe.u.freq.m = bss->freq;
807 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
809 memset(&iwe, 0, sizeof(iwe));
811 iwe.u.qual.qual = bss->qual;
812 iwe.u.qual.level = bss->signal;
813 iwe.u.qual.noise = bss->noise;
814 iwe.u.qual.updated = local->wstats_flags;
815 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
818 memset(&iwe, 0, sizeof(iwe));
819 iwe.cmd = SIOCGIWENCODE;
820 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
821 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
823 iwe.u.data.flags = IW_ENCODE_DISABLED;
824 iwe.u.data.length = 0;
825 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
828 ieee80211_sta_add_scan_ies(info, bss, ¤t_ev, end_buf);
830 if (bss->supp_rates_len > 0) {
831 /* display all supported rates in readable format */
832 char *p = current_ev + iwe_stream_lcp_len(info);
835 memset(&iwe, 0, sizeof(iwe));
836 iwe.cmd = SIOCGIWRATE;
837 /* Those two flags are ignored... */
838 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
840 for (i = 0; i < bss->supp_rates_len; i++) {
841 iwe.u.bitrate.value = ((bss->supp_rates[i] &
843 p = iwe_stream_add_value(info, current_ev, p,
844 end_buf, &iwe, IW_EV_PARAM_LEN);
849 buf = kmalloc(30, GFP_ATOMIC);
851 memset(&iwe, 0, sizeof(iwe));
852 iwe.cmd = IWEVCUSTOM;
853 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
854 iwe.u.data.length = strlen(buf);
855 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
857 memset(&iwe, 0, sizeof(iwe));
858 iwe.cmd = IWEVCUSTOM;
859 sprintf(buf, " Last beacon: %dms ago",
860 jiffies_to_msecs(jiffies - bss->last_update));
861 iwe.u.data.length = strlen(buf);
862 current_ev = iwe_stream_add_point(info, current_ev,
867 if (bss_mesh_cfg(bss)) {
868 u8 *cfg = bss_mesh_cfg(bss);
869 buf = kmalloc(50, GFP_ATOMIC);
871 memset(&iwe, 0, sizeof(iwe));
872 iwe.cmd = IWEVCUSTOM;
873 sprintf(buf, "Mesh network (version %d)", cfg[0]);
874 iwe.u.data.length = strlen(buf);
875 current_ev = iwe_stream_add_point(info, current_ev,
878 sprintf(buf, "Path Selection Protocol ID: "
879 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
881 iwe.u.data.length = strlen(buf);
882 current_ev = iwe_stream_add_point(info, current_ev,
885 sprintf(buf, "Path Selection Metric ID: "
886 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
888 iwe.u.data.length = strlen(buf);
889 current_ev = iwe_stream_add_point(info, current_ev,
892 sprintf(buf, "Congestion Control Mode ID: "
893 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
895 iwe.u.data.length = strlen(buf);
896 current_ev = iwe_stream_add_point(info, current_ev,
899 sprintf(buf, "Channel Precedence: "
900 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
902 iwe.u.data.length = strlen(buf);
903 current_ev = iwe_stream_add_point(info, current_ev,
914 int ieee80211_sta_scan_results(struct ieee80211_local *local,
915 struct iw_request_info *info,
916 char *buf, size_t len)
918 char *current_ev = buf;
919 char *end_buf = buf + len;
920 struct ieee80211_sta_bss *bss;
922 spin_lock_bh(&local->sta_bss_lock);
923 list_for_each_entry(bss, &local->sta_bss_list, list) {
924 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
925 spin_unlock_bh(&local->sta_bss_lock);
928 current_ev = ieee80211_sta_scan_result(local, info, bss,
929 current_ev, end_buf);
931 spin_unlock_bh(&local->sta_bss_lock);
932 return current_ev - buf;