2 * cfg80211 scan result handling
4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
6 #include <linux/kernel.h>
7 #include <linux/slab.h>
8 #include <linux/module.h>
9 #include <linux/netdevice.h>
10 #include <linux/wireless.h>
11 #include <linux/nl80211.h>
12 #include <linux/etherdevice.h>
14 #include <net/cfg80211.h>
15 #include <net/cfg80211-wext.h>
16 #include <net/iw_handler.h>
19 #include "wext-compat.h"
21 #define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ)
23 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
25 struct cfg80211_scan_request *request;
26 struct net_device *dev;
27 #ifdef CONFIG_CFG80211_WEXT
28 union iwreq_data wrqu;
31 ASSERT_RDEV_LOCK(rdev);
33 request = rdev->scan_req;
41 * This must be before sending the other events!
42 * Otherwise, wpa_supplicant gets completely confused with
45 cfg80211_sme_scan_done(dev);
48 nl80211_send_scan_aborted(rdev, dev);
50 nl80211_send_scan_done(rdev, dev);
52 #ifdef CONFIG_CFG80211_WEXT
53 if (!request->aborted) {
54 memset(&wrqu, 0, sizeof(wrqu));
56 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
62 rdev->scan_req = NULL;
65 * OK. If this is invoked with "leak" then we can't
66 * free this ... but we've cleaned it up anyway. The
67 * driver failed to call the scan_done callback, so
68 * all bets are off, it might still be trying to use
69 * the scan request or not ... if it accesses the dev
70 * in there (it shouldn't anyway) then it may crash.
76 void __cfg80211_scan_done(struct work_struct *wk)
78 struct cfg80211_registered_device *rdev;
80 rdev = container_of(wk, struct cfg80211_registered_device,
83 cfg80211_lock_rdev(rdev);
84 ___cfg80211_scan_done(rdev, false);
85 cfg80211_unlock_rdev(rdev);
88 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
90 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
92 request->aborted = aborted;
93 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
95 EXPORT_SYMBOL(cfg80211_scan_done);
97 void __cfg80211_sched_scan_results(struct work_struct *wk)
99 struct cfg80211_registered_device *rdev;
101 rdev = container_of(wk, struct cfg80211_registered_device,
102 sched_scan_results_wk);
104 mutex_lock(&rdev->sched_scan_mtx);
106 /* we don't have sched_scan_req anymore if the scan is stopping */
107 if (rdev->sched_scan_req)
108 nl80211_send_sched_scan_results(rdev,
109 rdev->sched_scan_req->dev);
111 mutex_unlock(&rdev->sched_scan_mtx);
114 void cfg80211_sched_scan_results(struct wiphy *wiphy)
116 /* ignore if we're not scanning */
117 if (wiphy_to_dev(wiphy)->sched_scan_req)
118 queue_work(cfg80211_wq,
119 &wiphy_to_dev(wiphy)->sched_scan_results_wk);
121 EXPORT_SYMBOL(cfg80211_sched_scan_results);
123 void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
125 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
127 mutex_lock(&rdev->sched_scan_mtx);
128 __cfg80211_stop_sched_scan(rdev, true);
129 mutex_unlock(&rdev->sched_scan_mtx);
131 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
133 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
134 bool driver_initiated)
136 struct net_device *dev;
138 lockdep_assert_held(&rdev->sched_scan_mtx);
140 if (!rdev->sched_scan_req)
143 dev = rdev->sched_scan_req->dev;
145 if (!driver_initiated) {
146 int err = rdev->ops->sched_scan_stop(&rdev->wiphy, dev);
151 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
153 kfree(rdev->sched_scan_req);
154 rdev->sched_scan_req = NULL;
159 static void bss_release(struct kref *ref)
161 struct cfg80211_internal_bss *bss;
163 bss = container_of(ref, struct cfg80211_internal_bss, ref);
164 if (bss->pub.free_priv)
165 bss->pub.free_priv(&bss->pub);
167 if (bss->beacon_ies_allocated)
168 kfree(bss->pub.beacon_ies);
169 if (bss->proberesp_ies_allocated)
170 kfree(bss->pub.proberesp_ies);
172 BUG_ON(atomic_read(&bss->hold));
177 /* must hold dev->bss_lock! */
178 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
179 unsigned long age_secs)
181 struct cfg80211_internal_bss *bss;
182 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
184 list_for_each_entry(bss, &dev->bss_list, list) {
185 bss->ts -= age_jiffies;
189 /* must hold dev->bss_lock! */
190 static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
191 struct cfg80211_internal_bss *bss)
193 list_del_init(&bss->list);
194 rb_erase(&bss->rbn, &dev->bss_tree);
195 kref_put(&bss->ref, bss_release);
198 /* must hold dev->bss_lock! */
199 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
201 struct cfg80211_internal_bss *bss, *tmp;
202 bool expired = false;
204 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
205 if (atomic_read(&bss->hold))
207 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
209 __cfg80211_unlink_bss(dev, bss);
214 dev->bss_generation++;
217 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
219 while (len > 2 && ies[0] != eid) {
225 if (len < 2 + ies[1])
229 EXPORT_SYMBOL(cfg80211_find_ie);
231 const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
232 const u8 *ies, int len)
234 struct ieee80211_vendor_ie *ie;
235 const u8 *pos = ies, *end = ies + len;
239 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
244 if (end - pos < sizeof(*ie))
247 ie = (struct ieee80211_vendor_ie *)pos;
248 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
249 if (ie_oui == oui && ie->oui_type == oui_type)
256 EXPORT_SYMBOL(cfg80211_find_vendor_ie);
258 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
260 const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
261 const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
269 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
270 if (r == 0 && ie1[1] != ie2[1])
271 return ie2[1] - ie1[1];
275 static bool is_bss(struct cfg80211_bss *a,
277 const u8 *ssid, size_t ssid_len)
281 if (bssid && compare_ether_addr(a->bssid, bssid))
287 ssidie = cfg80211_find_ie(WLAN_EID_SSID,
288 a->information_elements,
289 a->len_information_elements);
292 if (ssidie[1] != ssid_len)
294 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
297 static bool is_mesh_bss(struct cfg80211_bss *a)
301 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
304 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
305 a->information_elements,
306 a->len_information_elements);
310 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
311 a->information_elements,
312 a->len_information_elements);
319 static bool is_mesh(struct cfg80211_bss *a,
320 const u8 *meshid, size_t meshidlen,
325 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
328 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
329 a->information_elements,
330 a->len_information_elements);
333 if (ie[1] != meshidlen)
335 if (memcmp(ie + 2, meshid, meshidlen))
338 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
339 a->information_elements,
340 a->len_information_elements);
343 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
347 * Ignore mesh capability (last two bytes of the IE) when
348 * comparing since that may differ between stations taking
349 * part in the same mesh.
351 return memcmp(ie + 2, meshcfg,
352 sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
355 static int cmp_bss(struct cfg80211_bss *a,
356 struct cfg80211_bss *b)
360 if (a->channel != b->channel)
361 return b->channel->center_freq - a->channel->center_freq;
363 if (is_mesh_bss(a) && is_mesh_bss(b)) {
364 r = cmp_ies(WLAN_EID_MESH_ID,
365 a->information_elements,
366 a->len_information_elements,
367 b->information_elements,
368 b->len_information_elements);
371 return cmp_ies(WLAN_EID_MESH_CONFIG,
372 a->information_elements,
373 a->len_information_elements,
374 b->information_elements,
375 b->len_information_elements);
378 r = memcmp(a->bssid, b->bssid, ETH_ALEN);
382 return cmp_ies(WLAN_EID_SSID,
383 a->information_elements,
384 a->len_information_elements,
385 b->information_elements,
386 b->len_information_elements);
389 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
390 struct ieee80211_channel *channel,
392 const u8 *ssid, size_t ssid_len,
393 u16 capa_mask, u16 capa_val)
395 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
396 struct cfg80211_internal_bss *bss, *res = NULL;
397 unsigned long now = jiffies;
399 spin_lock_bh(&dev->bss_lock);
401 list_for_each_entry(bss, &dev->bss_list, list) {
402 if ((bss->pub.capability & capa_mask) != capa_val)
404 if (channel && bss->pub.channel != channel)
406 /* Don't get expired BSS structs */
407 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
408 !atomic_read(&bss->hold))
410 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
417 spin_unlock_bh(&dev->bss_lock);
422 EXPORT_SYMBOL(cfg80211_get_bss);
424 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
425 struct ieee80211_channel *channel,
426 const u8 *meshid, size_t meshidlen,
429 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
430 struct cfg80211_internal_bss *bss, *res = NULL;
432 spin_lock_bh(&dev->bss_lock);
434 list_for_each_entry(bss, &dev->bss_list, list) {
435 if (channel && bss->pub.channel != channel)
437 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
444 spin_unlock_bh(&dev->bss_lock);
449 EXPORT_SYMBOL(cfg80211_get_mesh);
452 static void rb_insert_bss(struct cfg80211_registered_device *dev,
453 struct cfg80211_internal_bss *bss)
455 struct rb_node **p = &dev->bss_tree.rb_node;
456 struct rb_node *parent = NULL;
457 struct cfg80211_internal_bss *tbss;
462 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
464 cmp = cmp_bss(&bss->pub, &tbss->pub);
467 /* will sort of leak this BSS */
477 rb_link_node(&bss->rbn, parent, p);
478 rb_insert_color(&bss->rbn, &dev->bss_tree);
481 static struct cfg80211_internal_bss *
482 rb_find_bss(struct cfg80211_registered_device *dev,
483 struct cfg80211_internal_bss *res)
485 struct rb_node *n = dev->bss_tree.rb_node;
486 struct cfg80211_internal_bss *bss;
490 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
491 r = cmp_bss(&res->pub, &bss->pub);
504 static struct cfg80211_internal_bss *
505 cfg80211_bss_update(struct cfg80211_registered_device *dev,
506 struct cfg80211_internal_bss *res)
508 struct cfg80211_internal_bss *found = NULL;
511 * The reference to "res" is donated to this function.
514 if (WARN_ON(!res->pub.channel)) {
515 kref_put(&res->ref, bss_release);
521 spin_lock_bh(&dev->bss_lock);
523 found = rb_find_bss(dev, res);
526 found->pub.beacon_interval = res->pub.beacon_interval;
527 found->pub.tsf = res->pub.tsf;
528 found->pub.signal = res->pub.signal;
529 found->pub.capability = res->pub.capability;
533 if (res->pub.proberesp_ies) {
534 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
535 size_t ielen = res->pub.len_proberesp_ies;
537 if (found->pub.proberesp_ies &&
538 !found->proberesp_ies_allocated &&
539 ksize(found) >= used + ielen) {
540 memcpy(found->pub.proberesp_ies,
541 res->pub.proberesp_ies, ielen);
542 found->pub.len_proberesp_ies = ielen;
544 u8 *ies = found->pub.proberesp_ies;
546 if (found->proberesp_ies_allocated)
547 ies = krealloc(ies, ielen, GFP_ATOMIC);
549 ies = kmalloc(ielen, GFP_ATOMIC);
552 memcpy(ies, res->pub.proberesp_ies,
554 found->proberesp_ies_allocated = true;
555 found->pub.proberesp_ies = ies;
556 found->pub.len_proberesp_ies = ielen;
560 /* Override possible earlier Beacon frame IEs */
561 found->pub.information_elements =
562 found->pub.proberesp_ies;
563 found->pub.len_information_elements =
564 found->pub.len_proberesp_ies;
566 if (res->pub.beacon_ies) {
567 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
568 size_t ielen = res->pub.len_beacon_ies;
569 bool information_elements_is_beacon_ies =
570 (found->pub.information_elements ==
571 found->pub.beacon_ies);
573 if (found->pub.beacon_ies &&
574 !found->beacon_ies_allocated &&
575 ksize(found) >= used + ielen) {
576 memcpy(found->pub.beacon_ies,
577 res->pub.beacon_ies, ielen);
578 found->pub.len_beacon_ies = ielen;
580 u8 *ies = found->pub.beacon_ies;
582 if (found->beacon_ies_allocated)
583 ies = krealloc(ies, ielen, GFP_ATOMIC);
585 ies = kmalloc(ielen, GFP_ATOMIC);
588 memcpy(ies, res->pub.beacon_ies,
590 found->beacon_ies_allocated = true;
591 found->pub.beacon_ies = ies;
592 found->pub.len_beacon_ies = ielen;
596 /* Override IEs if they were from a beacon before */
597 if (information_elements_is_beacon_ies) {
598 found->pub.information_elements =
599 found->pub.beacon_ies;
600 found->pub.len_information_elements =
601 found->pub.len_beacon_ies;
605 kref_put(&res->ref, bss_release);
607 /* this "consumes" the reference */
608 list_add_tail(&res->list, &dev->bss_list);
609 rb_insert_bss(dev, res);
613 dev->bss_generation++;
614 spin_unlock_bh(&dev->bss_lock);
616 kref_get(&found->ref);
621 cfg80211_inform_bss(struct wiphy *wiphy,
622 struct ieee80211_channel *channel,
624 u64 timestamp, u16 capability, u16 beacon_interval,
625 const u8 *ie, size_t ielen,
626 s32 signal, gfp_t gfp)
628 struct cfg80211_internal_bss *res;
634 privsz = wiphy->bss_priv_size;
636 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
637 (signal < 0 || signal > 100)))
640 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
644 memcpy(res->pub.bssid, bssid, ETH_ALEN);
645 res->pub.channel = channel;
646 res->pub.signal = signal;
647 res->pub.tsf = timestamp;
648 res->pub.beacon_interval = beacon_interval;
649 res->pub.capability = capability;
651 * Since we do not know here whether the IEs are from a Beacon or Probe
652 * Response frame, we need to pick one of the options and only use it
653 * with the driver that does not provide the full Beacon/Probe Response
654 * frame. Use Beacon frame pointer to avoid indicating that this should
655 * override the information_elements pointer should we have received an
656 * earlier indication of Probe Response data.
658 * The initial buffer for the IEs is allocated with the BSS entry and
659 * is located after the private area.
661 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
662 memcpy(res->pub.beacon_ies, ie, ielen);
663 res->pub.len_beacon_ies = ielen;
664 res->pub.information_elements = res->pub.beacon_ies;
665 res->pub.len_information_elements = res->pub.len_beacon_ies;
667 kref_init(&res->ref);
669 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
673 if (res->pub.capability & WLAN_CAPABILITY_ESS)
674 regulatory_hint_found_beacon(wiphy, channel, gfp);
676 /* cfg80211_bss_update gives us a referenced result */
679 EXPORT_SYMBOL(cfg80211_inform_bss);
681 struct cfg80211_bss *
682 cfg80211_inform_bss_frame(struct wiphy *wiphy,
683 struct ieee80211_channel *channel,
684 struct ieee80211_mgmt *mgmt, size_t len,
685 s32 signal, gfp_t gfp)
687 struct cfg80211_internal_bss *res;
688 size_t ielen = len - offsetof(struct ieee80211_mgmt,
689 u.probe_resp.variable);
698 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
699 (signal < 0 || signal > 100)))
702 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
705 privsz = wiphy->bss_priv_size;
707 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
711 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
712 res->pub.channel = channel;
713 res->pub.signal = signal;
714 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
715 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
716 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
718 * The initial buffer for the IEs is allocated with the BSS entry and
719 * is located after the private area.
721 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
722 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
723 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
725 res->pub.len_proberesp_ies = ielen;
726 res->pub.information_elements = res->pub.proberesp_ies;
727 res->pub.len_information_elements = res->pub.len_proberesp_ies;
729 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
730 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
731 res->pub.len_beacon_ies = ielen;
732 res->pub.information_elements = res->pub.beacon_ies;
733 res->pub.len_information_elements = res->pub.len_beacon_ies;
736 kref_init(&res->ref);
738 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
742 if (res->pub.capability & WLAN_CAPABILITY_ESS)
743 regulatory_hint_found_beacon(wiphy, channel, gfp);
745 /* cfg80211_bss_update gives us a referenced result */
748 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
750 void cfg80211_put_bss(struct cfg80211_bss *pub)
752 struct cfg80211_internal_bss *bss;
757 bss = container_of(pub, struct cfg80211_internal_bss, pub);
758 kref_put(&bss->ref, bss_release);
760 EXPORT_SYMBOL(cfg80211_put_bss);
762 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
764 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
765 struct cfg80211_internal_bss *bss;
770 bss = container_of(pub, struct cfg80211_internal_bss, pub);
772 spin_lock_bh(&dev->bss_lock);
773 if (!list_empty(&bss->list)) {
774 __cfg80211_unlink_bss(dev, bss);
775 dev->bss_generation++;
777 spin_unlock_bh(&dev->bss_lock);
779 EXPORT_SYMBOL(cfg80211_unlink_bss);
781 #ifdef CONFIG_CFG80211_WEXT
782 int cfg80211_wext_siwscan(struct net_device *dev,
783 struct iw_request_info *info,
784 union iwreq_data *wrqu, char *extra)
786 struct cfg80211_registered_device *rdev;
788 struct iw_scan_req *wreq = NULL;
789 struct cfg80211_scan_request *creq = NULL;
790 int i, err, n_channels = 0;
791 enum ieee80211_band band;
793 if (!netif_running(dev))
796 if (wrqu->data.length == sizeof(struct iw_scan_req))
797 wreq = (struct iw_scan_req *)extra;
799 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
802 return PTR_ERR(rdev);
804 if (rdev->scan_req) {
809 wiphy = &rdev->wiphy;
811 /* Determine number of channels, needed to allocate creq */
812 if (wreq && wreq->num_channels)
813 n_channels = wreq->num_channels;
815 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
816 if (wiphy->bands[band])
817 n_channels += wiphy->bands[band]->n_channels;
820 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
821 n_channels * sizeof(void *),
830 /* SSIDs come after channels */
831 creq->ssids = (void *)&creq->channels[n_channels];
832 creq->n_channels = n_channels;
835 /* translate "Scan on frequencies" request */
837 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
840 if (!wiphy->bands[band])
843 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
844 /* ignore disabled channels */
845 if (wiphy->bands[band]->channels[j].flags &
846 IEEE80211_CHAN_DISABLED)
849 /* If we have a wireless request structure and the
850 * wireless request specifies frequencies, then search
851 * for the matching hardware channel.
853 if (wreq && wreq->num_channels) {
855 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
856 for (k = 0; k < wreq->num_channels; k++) {
857 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
858 if (wext_freq == wiphy_freq)
859 goto wext_freq_found;
861 goto wext_freq_not_found;
865 creq->channels[i] = &wiphy->bands[band]->channels[j];
867 wext_freq_not_found: ;
870 /* No channels found? */
876 /* Set real number of channels specified in creq->channels[] */
877 creq->n_channels = i;
879 /* translate "Scan for SSID" request */
881 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
882 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
886 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
887 creq->ssids[0].ssid_len = wreq->essid_len;
889 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
893 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
895 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
897 rdev->scan_req = creq;
898 err = rdev->ops->scan(wiphy, dev, creq);
900 rdev->scan_req = NULL;
901 /* creq will be freed below */
903 nl80211_send_scan_start(rdev, dev);
904 /* creq now owned by driver */
910 cfg80211_unlock_rdev(rdev);
913 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
915 static void ieee80211_scan_add_ies(struct iw_request_info *info,
916 struct cfg80211_bss *bss,
917 char **current_ev, char *end_buf)
919 u8 *pos, *end, *next;
922 if (!bss->information_elements ||
923 !bss->len_information_elements)
927 * If needed, fragment the IEs buffer (at IE boundaries) into short
928 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
930 pos = bss->information_elements;
931 end = pos + bss->len_information_elements;
933 while (end - pos > IW_GENERIC_IE_MAX) {
934 next = pos + 2 + pos[1];
935 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
936 next = next + 2 + next[1];
938 memset(&iwe, 0, sizeof(iwe));
940 iwe.u.data.length = next - pos;
941 *current_ev = iwe_stream_add_point(info, *current_ev,
948 memset(&iwe, 0, sizeof(iwe));
950 iwe.u.data.length = end - pos;
951 *current_ev = iwe_stream_add_point(info, *current_ev,
956 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
958 unsigned long end = jiffies;
961 return jiffies_to_msecs(end - start);
963 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
967 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
968 struct cfg80211_internal_bss *bss, char *current_ev,
973 u8 *ie = bss->pub.information_elements;
974 int rem = bss->pub.len_information_elements, i, sig;
977 memset(&iwe, 0, sizeof(iwe));
979 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
980 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
981 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
984 memset(&iwe, 0, sizeof(iwe));
985 iwe.cmd = SIOCGIWFREQ;
986 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
988 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
991 memset(&iwe, 0, sizeof(iwe));
992 iwe.cmd = SIOCGIWFREQ;
993 iwe.u.freq.m = bss->pub.channel->center_freq;
995 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
998 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
999 memset(&iwe, 0, sizeof(iwe));
1001 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1002 IW_QUAL_NOISE_INVALID |
1003 IW_QUAL_QUAL_UPDATED;
1004 switch (wiphy->signal_type) {
1005 case CFG80211_SIGNAL_TYPE_MBM:
1006 sig = bss->pub.signal / 100;
1007 iwe.u.qual.level = sig;
1008 iwe.u.qual.updated |= IW_QUAL_DBM;
1009 if (sig < -110) /* rather bad */
1011 else if (sig > -40) /* perfect */
1013 /* will give a range of 0 .. 70 */
1014 iwe.u.qual.qual = sig + 110;
1016 case CFG80211_SIGNAL_TYPE_UNSPEC:
1017 iwe.u.qual.level = bss->pub.signal;
1018 /* will give range 0 .. 100 */
1019 iwe.u.qual.qual = bss->pub.signal;
1025 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1026 &iwe, IW_EV_QUAL_LEN);
1029 memset(&iwe, 0, sizeof(iwe));
1030 iwe.cmd = SIOCGIWENCODE;
1031 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1032 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1034 iwe.u.data.flags = IW_ENCODE_DISABLED;
1035 iwe.u.data.length = 0;
1036 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1041 if (ie[1] > rem - 2)
1046 memset(&iwe, 0, sizeof(iwe));
1047 iwe.cmd = SIOCGIWESSID;
1048 iwe.u.data.length = ie[1];
1049 iwe.u.data.flags = 1;
1050 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1053 case WLAN_EID_MESH_ID:
1054 memset(&iwe, 0, sizeof(iwe));
1055 iwe.cmd = SIOCGIWESSID;
1056 iwe.u.data.length = ie[1];
1057 iwe.u.data.flags = 1;
1058 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1061 case WLAN_EID_MESH_CONFIG:
1063 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1065 buf = kmalloc(50, GFP_ATOMIC);
1069 memset(&iwe, 0, sizeof(iwe));
1070 iwe.cmd = IWEVCUSTOM;
1071 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1073 iwe.u.data.length = strlen(buf);
1074 current_ev = iwe_stream_add_point(info, current_ev,
1077 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1079 iwe.u.data.length = strlen(buf);
1080 current_ev = iwe_stream_add_point(info, current_ev,
1083 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1085 iwe.u.data.length = strlen(buf);
1086 current_ev = iwe_stream_add_point(info, current_ev,
1089 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1090 iwe.u.data.length = strlen(buf);
1091 current_ev = iwe_stream_add_point(info, current_ev,
1094 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1095 iwe.u.data.length = strlen(buf);
1096 current_ev = iwe_stream_add_point(info, current_ev,
1099 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1100 iwe.u.data.length = strlen(buf);
1101 current_ev = iwe_stream_add_point(info, current_ev,
1104 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1105 iwe.u.data.length = strlen(buf);
1106 current_ev = iwe_stream_add_point(info, current_ev,
1111 case WLAN_EID_SUPP_RATES:
1112 case WLAN_EID_EXT_SUPP_RATES:
1113 /* display all supported rates in readable format */
1114 p = current_ev + iwe_stream_lcp_len(info);
1116 memset(&iwe, 0, sizeof(iwe));
1117 iwe.cmd = SIOCGIWRATE;
1118 /* Those two flags are ignored... */
1119 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1121 for (i = 0; i < ie[1]; i++) {
1122 iwe.u.bitrate.value =
1123 ((ie[i + 2] & 0x7f) * 500000);
1124 p = iwe_stream_add_value(info, current_ev, p,
1125 end_buf, &iwe, IW_EV_PARAM_LEN);
1134 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1136 memset(&iwe, 0, sizeof(iwe));
1137 iwe.cmd = SIOCGIWMODE;
1139 iwe.u.mode = IW_MODE_MESH;
1140 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1141 iwe.u.mode = IW_MODE_MASTER;
1143 iwe.u.mode = IW_MODE_ADHOC;
1144 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1145 &iwe, IW_EV_UINT_LEN);
1148 buf = kmalloc(30, GFP_ATOMIC);
1150 memset(&iwe, 0, sizeof(iwe));
1151 iwe.cmd = IWEVCUSTOM;
1152 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1153 iwe.u.data.length = strlen(buf);
1154 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1156 memset(&iwe, 0, sizeof(iwe));
1157 iwe.cmd = IWEVCUSTOM;
1158 sprintf(buf, " Last beacon: %ums ago",
1159 elapsed_jiffies_msecs(bss->ts));
1160 iwe.u.data.length = strlen(buf);
1161 current_ev = iwe_stream_add_point(info, current_ev,
1162 end_buf, &iwe, buf);
1166 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf);
1172 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1173 struct iw_request_info *info,
1174 char *buf, size_t len)
1176 char *current_ev = buf;
1177 char *end_buf = buf + len;
1178 struct cfg80211_internal_bss *bss;
1180 spin_lock_bh(&dev->bss_lock);
1181 cfg80211_bss_expire(dev);
1183 list_for_each_entry(bss, &dev->bss_list, list) {
1184 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1185 spin_unlock_bh(&dev->bss_lock);
1188 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1189 current_ev, end_buf);
1191 spin_unlock_bh(&dev->bss_lock);
1192 return current_ev - buf;
1196 int cfg80211_wext_giwscan(struct net_device *dev,
1197 struct iw_request_info *info,
1198 struct iw_point *data, char *extra)
1200 struct cfg80211_registered_device *rdev;
1203 if (!netif_running(dev))
1206 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1209 return PTR_ERR(rdev);
1211 if (rdev->scan_req) {
1216 res = ieee80211_scan_results(rdev, info, extra, data->length);
1224 cfg80211_unlock_rdev(rdev);
1227 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);