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 (30 * 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);
263 /* equal if both missing */
266 /* sort missing IE before (left of) present IE */
272 /* sort by length first, then by contents */
273 if (ie1[1] != ie2[1])
274 return ie2[1] - ie1[1];
275 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
278 static bool is_bss(struct cfg80211_bss *a,
280 const u8 *ssid, size_t ssid_len)
284 if (bssid && !ether_addr_equal(a->bssid, bssid))
290 ssidie = cfg80211_find_ie(WLAN_EID_SSID,
291 a->information_elements,
292 a->len_information_elements);
295 if (ssidie[1] != ssid_len)
297 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
300 static bool is_mesh_bss(struct cfg80211_bss *a)
304 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
307 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
308 a->information_elements,
309 a->len_information_elements);
313 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
314 a->information_elements,
315 a->len_information_elements);
322 static bool is_mesh(struct cfg80211_bss *a,
323 const u8 *meshid, size_t meshidlen,
328 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
331 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
332 a->information_elements,
333 a->len_information_elements);
336 if (ie[1] != meshidlen)
338 if (memcmp(ie + 2, meshid, meshidlen))
341 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
342 a->information_elements,
343 a->len_information_elements);
346 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
350 * Ignore mesh capability (last two bytes of the IE) when
351 * comparing since that may differ between stations taking
352 * part in the same mesh.
354 return memcmp(ie + 2, meshcfg,
355 sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
358 static int cmp_bss_core(struct cfg80211_bss *a,
359 struct cfg80211_bss *b)
363 if (a->channel != b->channel)
364 return b->channel->center_freq - a->channel->center_freq;
366 if (is_mesh_bss(a) && is_mesh_bss(b)) {
367 r = cmp_ies(WLAN_EID_MESH_ID,
368 a->information_elements,
369 a->len_information_elements,
370 b->information_elements,
371 b->len_information_elements);
374 return cmp_ies(WLAN_EID_MESH_CONFIG,
375 a->information_elements,
376 a->len_information_elements,
377 b->information_elements,
378 b->len_information_elements);
382 * we can't use compare_ether_addr here since we need a < > operator.
383 * The binary return value of compare_ether_addr isn't enough
385 return memcmp(a->bssid, b->bssid, sizeof(a->bssid));
388 static int cmp_bss(struct cfg80211_bss *a,
389 struct cfg80211_bss *b)
393 r = cmp_bss_core(a, b);
397 return cmp_ies(WLAN_EID_SSID,
398 a->information_elements,
399 a->len_information_elements,
400 b->information_elements,
401 b->len_information_elements);
404 static int cmp_hidden_bss(struct cfg80211_bss *a,
405 struct cfg80211_bss *b)
412 r = cmp_bss_core(a, b);
416 ie1 = cfg80211_find_ie(WLAN_EID_SSID,
417 a->information_elements,
418 a->len_information_elements);
419 ie2 = cfg80211_find_ie(WLAN_EID_SSID,
420 b->information_elements,
421 b->len_information_elements);
423 /* Key comparator must use same algorithm in any rb-tree
424 * search function (order is important), otherwise ordering
425 * of items in the tree is broken and search gives incorrect
426 * results. This code uses same order as cmp_ies() does. */
428 /* sort missing IE before (left of) present IE */
434 /* zero-size SSID is used as an indication of the hidden bss */
438 /* sort by length first, then by contents */
439 if (ie1[1] != ie2[1])
440 return ie2[1] - ie1[1];
442 /* zeroed SSID ie is another indication of a hidden bss */
443 for (i = 0; i < ie2[1]; i++)
450 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
451 struct ieee80211_channel *channel,
453 const u8 *ssid, size_t ssid_len,
454 u16 capa_mask, u16 capa_val)
456 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
457 struct cfg80211_internal_bss *bss, *res = NULL;
458 unsigned long now = jiffies;
460 spin_lock_bh(&dev->bss_lock);
462 list_for_each_entry(bss, &dev->bss_list, list) {
463 if ((bss->pub.capability & capa_mask) != capa_val)
465 if (channel && bss->pub.channel != channel)
467 /* Don't get expired BSS structs */
468 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
469 !atomic_read(&bss->hold))
471 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
478 spin_unlock_bh(&dev->bss_lock);
483 EXPORT_SYMBOL(cfg80211_get_bss);
485 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
486 struct ieee80211_channel *channel,
487 const u8 *meshid, size_t meshidlen,
490 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
491 struct cfg80211_internal_bss *bss, *res = NULL;
493 spin_lock_bh(&dev->bss_lock);
495 list_for_each_entry(bss, &dev->bss_list, list) {
496 if (channel && bss->pub.channel != channel)
498 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
505 spin_unlock_bh(&dev->bss_lock);
510 EXPORT_SYMBOL(cfg80211_get_mesh);
513 static void rb_insert_bss(struct cfg80211_registered_device *dev,
514 struct cfg80211_internal_bss *bss)
516 struct rb_node **p = &dev->bss_tree.rb_node;
517 struct rb_node *parent = NULL;
518 struct cfg80211_internal_bss *tbss;
523 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
525 cmp = cmp_bss(&bss->pub, &tbss->pub);
528 /* will sort of leak this BSS */
538 rb_link_node(&bss->rbn, parent, p);
539 rb_insert_color(&bss->rbn, &dev->bss_tree);
542 static struct cfg80211_internal_bss *
543 rb_find_bss(struct cfg80211_registered_device *dev,
544 struct cfg80211_internal_bss *res)
546 struct rb_node *n = dev->bss_tree.rb_node;
547 struct cfg80211_internal_bss *bss;
551 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
552 r = cmp_bss(&res->pub, &bss->pub);
565 static struct cfg80211_internal_bss *
566 rb_find_hidden_bss(struct cfg80211_registered_device *dev,
567 struct cfg80211_internal_bss *res)
569 struct rb_node *n = dev->bss_tree.rb_node;
570 struct cfg80211_internal_bss *bss;
574 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
575 r = cmp_hidden_bss(&res->pub, &bss->pub);
589 copy_hidden_ies(struct cfg80211_internal_bss *res,
590 struct cfg80211_internal_bss *hidden)
592 if (unlikely(res->pub.beacon_ies))
594 if (WARN_ON(!hidden->pub.beacon_ies))
597 res->pub.beacon_ies = kmalloc(hidden->pub.len_beacon_ies, GFP_ATOMIC);
598 if (unlikely(!res->pub.beacon_ies))
601 res->beacon_ies_allocated = true;
602 res->pub.len_beacon_ies = hidden->pub.len_beacon_ies;
603 memcpy(res->pub.beacon_ies, hidden->pub.beacon_ies,
604 res->pub.len_beacon_ies);
607 static struct cfg80211_internal_bss *
608 cfg80211_bss_update(struct cfg80211_registered_device *dev,
609 struct cfg80211_internal_bss *res)
611 struct cfg80211_internal_bss *found = NULL;
614 * The reference to "res" is donated to this function.
617 if (WARN_ON(!res->pub.channel)) {
618 kref_put(&res->ref, bss_release);
624 spin_lock_bh(&dev->bss_lock);
626 found = rb_find_bss(dev, res);
629 found->pub.beacon_interval = res->pub.beacon_interval;
630 found->pub.tsf = res->pub.tsf;
631 found->pub.signal = res->pub.signal;
632 found->pub.capability = res->pub.capability;
636 if (res->pub.proberesp_ies) {
637 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
638 size_t ielen = res->pub.len_proberesp_ies;
640 if (found->pub.proberesp_ies &&
641 !found->proberesp_ies_allocated &&
642 ksize(found) >= used + ielen) {
643 memcpy(found->pub.proberesp_ies,
644 res->pub.proberesp_ies, ielen);
645 found->pub.len_proberesp_ies = ielen;
647 u8 *ies = found->pub.proberesp_ies;
649 if (found->proberesp_ies_allocated)
650 ies = krealloc(ies, ielen, GFP_ATOMIC);
652 ies = kmalloc(ielen, GFP_ATOMIC);
655 memcpy(ies, res->pub.proberesp_ies,
657 found->proberesp_ies_allocated = true;
658 found->pub.proberesp_ies = ies;
659 found->pub.len_proberesp_ies = ielen;
663 /* Override possible earlier Beacon frame IEs */
664 found->pub.information_elements =
665 found->pub.proberesp_ies;
666 found->pub.len_information_elements =
667 found->pub.len_proberesp_ies;
669 if (res->pub.beacon_ies) {
670 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
671 size_t ielen = res->pub.len_beacon_ies;
672 bool information_elements_is_beacon_ies =
673 (found->pub.information_elements ==
674 found->pub.beacon_ies);
676 if (found->pub.beacon_ies &&
677 !found->beacon_ies_allocated &&
678 ksize(found) >= used + ielen) {
679 memcpy(found->pub.beacon_ies,
680 res->pub.beacon_ies, ielen);
681 found->pub.len_beacon_ies = ielen;
683 u8 *ies = found->pub.beacon_ies;
685 if (found->beacon_ies_allocated)
686 ies = krealloc(ies, ielen, GFP_ATOMIC);
688 ies = kmalloc(ielen, GFP_ATOMIC);
691 memcpy(ies, res->pub.beacon_ies,
693 found->beacon_ies_allocated = true;
694 found->pub.beacon_ies = ies;
695 found->pub.len_beacon_ies = ielen;
699 /* Override IEs if they were from a beacon before */
700 if (information_elements_is_beacon_ies) {
701 found->pub.information_elements =
702 found->pub.beacon_ies;
703 found->pub.len_information_elements =
704 found->pub.len_beacon_ies;
708 kref_put(&res->ref, bss_release);
710 struct cfg80211_internal_bss *hidden;
712 /* First check if the beacon is a probe response from
713 * a hidden bss. If so, copy beacon ies (with nullified
714 * ssid) into the probe response bss entry (with real ssid).
715 * It is required basically for PSM implementation
716 * (probe responses do not contain tim ie) */
718 /* TODO: The code is not trying to update existing probe
719 * response bss entries when beacon ies are
720 * getting changed. */
721 hidden = rb_find_hidden_bss(dev, res);
723 copy_hidden_ies(res, hidden);
725 /* this "consumes" the reference */
726 list_add_tail(&res->list, &dev->bss_list);
727 rb_insert_bss(dev, res);
731 dev->bss_generation++;
732 spin_unlock_bh(&dev->bss_lock);
734 kref_get(&found->ref);
739 cfg80211_inform_bss(struct wiphy *wiphy,
740 struct ieee80211_channel *channel,
741 const u8 *bssid, u64 tsf, u16 capability,
742 u16 beacon_interval, const u8 *ie, size_t ielen,
743 s32 signal, gfp_t gfp)
745 struct cfg80211_internal_bss *res;
751 privsz = wiphy->bss_priv_size;
753 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
754 (signal < 0 || signal > 100)))
757 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
761 memcpy(res->pub.bssid, bssid, ETH_ALEN);
762 res->pub.channel = channel;
763 res->pub.signal = signal;
765 res->pub.beacon_interval = beacon_interval;
766 res->pub.capability = capability;
768 * Since we do not know here whether the IEs are from a Beacon or Probe
769 * Response frame, we need to pick one of the options and only use it
770 * with the driver that does not provide the full Beacon/Probe Response
771 * frame. Use Beacon frame pointer to avoid indicating that this should
772 * override the information_elements pointer should we have received an
773 * earlier indication of Probe Response data.
775 * The initial buffer for the IEs is allocated with the BSS entry and
776 * is located after the private area.
778 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
779 memcpy(res->pub.beacon_ies, ie, ielen);
780 res->pub.len_beacon_ies = ielen;
781 res->pub.information_elements = res->pub.beacon_ies;
782 res->pub.len_information_elements = res->pub.len_beacon_ies;
784 kref_init(&res->ref);
786 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
790 if (res->pub.capability & WLAN_CAPABILITY_ESS)
791 regulatory_hint_found_beacon(wiphy, channel, gfp);
793 /* cfg80211_bss_update gives us a referenced result */
796 EXPORT_SYMBOL(cfg80211_inform_bss);
798 struct cfg80211_bss *
799 cfg80211_inform_bss_frame(struct wiphy *wiphy,
800 struct ieee80211_channel *channel,
801 struct ieee80211_mgmt *mgmt, size_t len,
802 s32 signal, gfp_t gfp)
804 struct cfg80211_internal_bss *res;
805 size_t ielen = len - offsetof(struct ieee80211_mgmt,
806 u.probe_resp.variable);
815 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
816 (signal < 0 || signal > 100)))
819 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
822 privsz = wiphy->bss_priv_size;
824 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
828 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
829 res->pub.channel = channel;
830 res->pub.signal = signal;
831 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
832 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
833 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
835 * The initial buffer for the IEs is allocated with the BSS entry and
836 * is located after the private area.
838 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
839 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
840 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
842 res->pub.len_proberesp_ies = ielen;
843 res->pub.information_elements = res->pub.proberesp_ies;
844 res->pub.len_information_elements = res->pub.len_proberesp_ies;
846 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
847 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
848 res->pub.len_beacon_ies = ielen;
849 res->pub.information_elements = res->pub.beacon_ies;
850 res->pub.len_information_elements = res->pub.len_beacon_ies;
853 kref_init(&res->ref);
855 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
859 if (res->pub.capability & WLAN_CAPABILITY_ESS)
860 regulatory_hint_found_beacon(wiphy, channel, gfp);
862 /* cfg80211_bss_update gives us a referenced result */
865 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
867 void cfg80211_ref_bss(struct cfg80211_bss *pub)
869 struct cfg80211_internal_bss *bss;
874 bss = container_of(pub, struct cfg80211_internal_bss, pub);
877 EXPORT_SYMBOL(cfg80211_ref_bss);
879 void cfg80211_put_bss(struct cfg80211_bss *pub)
881 struct cfg80211_internal_bss *bss;
886 bss = container_of(pub, struct cfg80211_internal_bss, pub);
887 kref_put(&bss->ref, bss_release);
889 EXPORT_SYMBOL(cfg80211_put_bss);
891 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
893 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
894 struct cfg80211_internal_bss *bss;
899 bss = container_of(pub, struct cfg80211_internal_bss, pub);
901 spin_lock_bh(&dev->bss_lock);
902 if (!list_empty(&bss->list)) {
903 __cfg80211_unlink_bss(dev, bss);
904 dev->bss_generation++;
906 spin_unlock_bh(&dev->bss_lock);
908 EXPORT_SYMBOL(cfg80211_unlink_bss);
910 #ifdef CONFIG_CFG80211_WEXT
911 int cfg80211_wext_siwscan(struct net_device *dev,
912 struct iw_request_info *info,
913 union iwreq_data *wrqu, char *extra)
915 struct cfg80211_registered_device *rdev;
917 struct iw_scan_req *wreq = NULL;
918 struct cfg80211_scan_request *creq = NULL;
919 int i, err, n_channels = 0;
920 enum ieee80211_band band;
922 if (!netif_running(dev))
925 if (wrqu->data.length == sizeof(struct iw_scan_req))
926 wreq = (struct iw_scan_req *)extra;
928 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
931 return PTR_ERR(rdev);
933 if (rdev->scan_req) {
938 wiphy = &rdev->wiphy;
940 /* Determine number of channels, needed to allocate creq */
941 if (wreq && wreq->num_channels)
942 n_channels = wreq->num_channels;
944 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
945 if (wiphy->bands[band])
946 n_channels += wiphy->bands[band]->n_channels;
949 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
950 n_channels * sizeof(void *),
959 /* SSIDs come after channels */
960 creq->ssids = (void *)&creq->channels[n_channels];
961 creq->n_channels = n_channels;
964 /* translate "Scan on frequencies" request */
966 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
969 if (!wiphy->bands[band])
972 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
973 /* ignore disabled channels */
974 if (wiphy->bands[band]->channels[j].flags &
975 IEEE80211_CHAN_DISABLED)
978 /* If we have a wireless request structure and the
979 * wireless request specifies frequencies, then search
980 * for the matching hardware channel.
982 if (wreq && wreq->num_channels) {
984 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
985 for (k = 0; k < wreq->num_channels; k++) {
986 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
987 if (wext_freq == wiphy_freq)
988 goto wext_freq_found;
990 goto wext_freq_not_found;
994 creq->channels[i] = &wiphy->bands[band]->channels[j];
996 wext_freq_not_found: ;
999 /* No channels found? */
1005 /* Set real number of channels specified in creq->channels[] */
1006 creq->n_channels = i;
1008 /* translate "Scan for SSID" request */
1010 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1011 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
1015 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1016 creq->ssids[0].ssid_len = wreq->essid_len;
1018 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1022 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
1023 if (wiphy->bands[i])
1024 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
1026 rdev->scan_req = creq;
1027 err = rdev->ops->scan(wiphy, dev, creq);
1029 rdev->scan_req = NULL;
1030 /* creq will be freed below */
1032 nl80211_send_scan_start(rdev, dev);
1033 /* creq now owned by driver */
1039 cfg80211_unlock_rdev(rdev);
1042 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
1044 static void ieee80211_scan_add_ies(struct iw_request_info *info,
1045 struct cfg80211_bss *bss,
1046 char **current_ev, char *end_buf)
1048 u8 *pos, *end, *next;
1049 struct iw_event iwe;
1051 if (!bss->information_elements ||
1052 !bss->len_information_elements)
1056 * If needed, fragment the IEs buffer (at IE boundaries) into short
1057 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1059 pos = bss->information_elements;
1060 end = pos + bss->len_information_elements;
1062 while (end - pos > IW_GENERIC_IE_MAX) {
1063 next = pos + 2 + pos[1];
1064 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1065 next = next + 2 + next[1];
1067 memset(&iwe, 0, sizeof(iwe));
1068 iwe.cmd = IWEVGENIE;
1069 iwe.u.data.length = next - pos;
1070 *current_ev = iwe_stream_add_point(info, *current_ev,
1071 end_buf, &iwe, pos);
1077 memset(&iwe, 0, sizeof(iwe));
1078 iwe.cmd = IWEVGENIE;
1079 iwe.u.data.length = end - pos;
1080 *current_ev = iwe_stream_add_point(info, *current_ev,
1081 end_buf, &iwe, pos);
1085 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
1087 unsigned long end = jiffies;
1090 return jiffies_to_msecs(end - start);
1092 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
1096 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1097 struct cfg80211_internal_bss *bss, char *current_ev,
1100 struct iw_event iwe;
1102 u8 *ie = bss->pub.information_elements;
1103 int rem = bss->pub.len_information_elements, i, sig;
1104 bool ismesh = false;
1106 memset(&iwe, 0, sizeof(iwe));
1107 iwe.cmd = SIOCGIWAP;
1108 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1109 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
1110 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1113 memset(&iwe, 0, sizeof(iwe));
1114 iwe.cmd = SIOCGIWFREQ;
1115 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1117 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1120 memset(&iwe, 0, sizeof(iwe));
1121 iwe.cmd = SIOCGIWFREQ;
1122 iwe.u.freq.m = bss->pub.channel->center_freq;
1124 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1127 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
1128 memset(&iwe, 0, sizeof(iwe));
1130 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1131 IW_QUAL_NOISE_INVALID |
1132 IW_QUAL_QUAL_UPDATED;
1133 switch (wiphy->signal_type) {
1134 case CFG80211_SIGNAL_TYPE_MBM:
1135 sig = bss->pub.signal / 100;
1136 iwe.u.qual.level = sig;
1137 iwe.u.qual.updated |= IW_QUAL_DBM;
1138 if (sig < -110) /* rather bad */
1140 else if (sig > -40) /* perfect */
1142 /* will give a range of 0 .. 70 */
1143 iwe.u.qual.qual = sig + 110;
1145 case CFG80211_SIGNAL_TYPE_UNSPEC:
1146 iwe.u.qual.level = bss->pub.signal;
1147 /* will give range 0 .. 100 */
1148 iwe.u.qual.qual = bss->pub.signal;
1154 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1155 &iwe, IW_EV_QUAL_LEN);
1158 memset(&iwe, 0, sizeof(iwe));
1159 iwe.cmd = SIOCGIWENCODE;
1160 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1161 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1163 iwe.u.data.flags = IW_ENCODE_DISABLED;
1164 iwe.u.data.length = 0;
1165 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1170 if (ie[1] > rem - 2)
1175 memset(&iwe, 0, sizeof(iwe));
1176 iwe.cmd = SIOCGIWESSID;
1177 iwe.u.data.length = ie[1];
1178 iwe.u.data.flags = 1;
1179 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1182 case WLAN_EID_MESH_ID:
1183 memset(&iwe, 0, sizeof(iwe));
1184 iwe.cmd = SIOCGIWESSID;
1185 iwe.u.data.length = ie[1];
1186 iwe.u.data.flags = 1;
1187 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1190 case WLAN_EID_MESH_CONFIG:
1192 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1194 buf = kmalloc(50, GFP_ATOMIC);
1198 memset(&iwe, 0, sizeof(iwe));
1199 iwe.cmd = IWEVCUSTOM;
1200 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1202 iwe.u.data.length = strlen(buf);
1203 current_ev = iwe_stream_add_point(info, current_ev,
1206 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1208 iwe.u.data.length = strlen(buf);
1209 current_ev = iwe_stream_add_point(info, current_ev,
1212 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1214 iwe.u.data.length = strlen(buf);
1215 current_ev = iwe_stream_add_point(info, current_ev,
1218 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1219 iwe.u.data.length = strlen(buf);
1220 current_ev = iwe_stream_add_point(info, current_ev,
1223 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1224 iwe.u.data.length = strlen(buf);
1225 current_ev = iwe_stream_add_point(info, current_ev,
1228 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1229 iwe.u.data.length = strlen(buf);
1230 current_ev = iwe_stream_add_point(info, current_ev,
1233 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1234 iwe.u.data.length = strlen(buf);
1235 current_ev = iwe_stream_add_point(info, current_ev,
1240 case WLAN_EID_SUPP_RATES:
1241 case WLAN_EID_EXT_SUPP_RATES:
1242 /* display all supported rates in readable format */
1243 p = current_ev + iwe_stream_lcp_len(info);
1245 memset(&iwe, 0, sizeof(iwe));
1246 iwe.cmd = SIOCGIWRATE;
1247 /* Those two flags are ignored... */
1248 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1250 for (i = 0; i < ie[1]; i++) {
1251 iwe.u.bitrate.value =
1252 ((ie[i + 2] & 0x7f) * 500000);
1253 p = iwe_stream_add_value(info, current_ev, p,
1254 end_buf, &iwe, IW_EV_PARAM_LEN);
1263 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1265 memset(&iwe, 0, sizeof(iwe));
1266 iwe.cmd = SIOCGIWMODE;
1268 iwe.u.mode = IW_MODE_MESH;
1269 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1270 iwe.u.mode = IW_MODE_MASTER;
1272 iwe.u.mode = IW_MODE_ADHOC;
1273 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1274 &iwe, IW_EV_UINT_LEN);
1277 buf = kmalloc(30, GFP_ATOMIC);
1279 memset(&iwe, 0, sizeof(iwe));
1280 iwe.cmd = IWEVCUSTOM;
1281 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1282 iwe.u.data.length = strlen(buf);
1283 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1285 memset(&iwe, 0, sizeof(iwe));
1286 iwe.cmd = IWEVCUSTOM;
1287 sprintf(buf, " Last beacon: %ums ago",
1288 elapsed_jiffies_msecs(bss->ts));
1289 iwe.u.data.length = strlen(buf);
1290 current_ev = iwe_stream_add_point(info, current_ev,
1291 end_buf, &iwe, buf);
1295 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf);
1301 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1302 struct iw_request_info *info,
1303 char *buf, size_t len)
1305 char *current_ev = buf;
1306 char *end_buf = buf + len;
1307 struct cfg80211_internal_bss *bss;
1309 spin_lock_bh(&dev->bss_lock);
1310 cfg80211_bss_expire(dev);
1312 list_for_each_entry(bss, &dev->bss_list, list) {
1313 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1314 spin_unlock_bh(&dev->bss_lock);
1317 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1318 current_ev, end_buf);
1320 spin_unlock_bh(&dev->bss_lock);
1321 return current_ev - buf;
1325 int cfg80211_wext_giwscan(struct net_device *dev,
1326 struct iw_request_info *info,
1327 struct iw_point *data, char *extra)
1329 struct cfg80211_registered_device *rdev;
1332 if (!netif_running(dev))
1335 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1338 return PTR_ERR(rdev);
1340 if (rdev->scan_req) {
1345 res = ieee80211_scan_results(rdev, info, extra, data->length);
1353 cfg80211_unlock_rdev(rdev);
1356 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);