![Johannes Berg](/assets/img/avatar_default.png)
The new P2P Device will have to be able to scan for P2P search, so move scanning to use struct wireless_dev instead of struct net_device. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
1360 lines
34 KiB
C
1360 lines
34 KiB
C
/*
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* cfg80211 scan result handling
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*
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* Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/wireless.h>
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#include <linux/nl80211.h>
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#include <linux/etherdevice.h>
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#include <net/arp.h>
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#include <net/cfg80211.h>
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#include <net/cfg80211-wext.h>
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#include <net/iw_handler.h>
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#include "core.h"
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#include "nl80211.h"
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#include "wext-compat.h"
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#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
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void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
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{
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struct cfg80211_scan_request *request;
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struct wireless_dev *wdev;
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#ifdef CONFIG_CFG80211_WEXT
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union iwreq_data wrqu;
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#endif
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ASSERT_RDEV_LOCK(rdev);
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request = rdev->scan_req;
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if (!request)
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return;
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wdev = request->wdev;
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/*
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* This must be before sending the other events!
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* Otherwise, wpa_supplicant gets completely confused with
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* wext events.
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*/
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if (wdev->netdev)
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cfg80211_sme_scan_done(wdev->netdev);
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if (request->aborted)
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nl80211_send_scan_aborted(rdev, wdev);
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else
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nl80211_send_scan_done(rdev, wdev);
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#ifdef CONFIG_CFG80211_WEXT
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if (wdev->netdev && !request->aborted) {
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memset(&wrqu, 0, sizeof(wrqu));
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wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
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}
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#endif
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if (wdev->netdev)
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dev_put(wdev->netdev);
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rdev->scan_req = NULL;
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/*
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* OK. If this is invoked with "leak" then we can't
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* free this ... but we've cleaned it up anyway. The
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* driver failed to call the scan_done callback, so
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* all bets are off, it might still be trying to use
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* the scan request or not ... if it accesses the dev
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* in there (it shouldn't anyway) then it may crash.
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*/
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if (!leak)
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kfree(request);
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}
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void __cfg80211_scan_done(struct work_struct *wk)
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{
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struct cfg80211_registered_device *rdev;
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rdev = container_of(wk, struct cfg80211_registered_device,
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scan_done_wk);
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cfg80211_lock_rdev(rdev);
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___cfg80211_scan_done(rdev, false);
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cfg80211_unlock_rdev(rdev);
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}
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void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
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{
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WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
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request->aborted = aborted;
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queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
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}
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EXPORT_SYMBOL(cfg80211_scan_done);
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void __cfg80211_sched_scan_results(struct work_struct *wk)
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{
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struct cfg80211_registered_device *rdev;
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rdev = container_of(wk, struct cfg80211_registered_device,
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sched_scan_results_wk);
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mutex_lock(&rdev->sched_scan_mtx);
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/* we don't have sched_scan_req anymore if the scan is stopping */
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if (rdev->sched_scan_req)
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nl80211_send_sched_scan_results(rdev,
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rdev->sched_scan_req->dev);
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mutex_unlock(&rdev->sched_scan_mtx);
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}
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void cfg80211_sched_scan_results(struct wiphy *wiphy)
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{
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/* ignore if we're not scanning */
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if (wiphy_to_dev(wiphy)->sched_scan_req)
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queue_work(cfg80211_wq,
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&wiphy_to_dev(wiphy)->sched_scan_results_wk);
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}
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EXPORT_SYMBOL(cfg80211_sched_scan_results);
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void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
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{
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struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
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mutex_lock(&rdev->sched_scan_mtx);
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__cfg80211_stop_sched_scan(rdev, true);
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mutex_unlock(&rdev->sched_scan_mtx);
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}
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EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
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int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
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bool driver_initiated)
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{
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struct net_device *dev;
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lockdep_assert_held(&rdev->sched_scan_mtx);
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if (!rdev->sched_scan_req)
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return -ENOENT;
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dev = rdev->sched_scan_req->dev;
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if (!driver_initiated) {
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int err = rdev->ops->sched_scan_stop(&rdev->wiphy, dev);
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if (err)
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return err;
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}
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nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
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kfree(rdev->sched_scan_req);
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rdev->sched_scan_req = NULL;
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return 0;
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}
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static void bss_release(struct kref *ref)
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{
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struct cfg80211_internal_bss *bss;
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bss = container_of(ref, struct cfg80211_internal_bss, ref);
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if (bss->pub.free_priv)
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bss->pub.free_priv(&bss->pub);
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if (bss->beacon_ies_allocated)
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kfree(bss->pub.beacon_ies);
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if (bss->proberesp_ies_allocated)
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kfree(bss->pub.proberesp_ies);
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BUG_ON(atomic_read(&bss->hold));
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kfree(bss);
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}
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/* must hold dev->bss_lock! */
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void cfg80211_bss_age(struct cfg80211_registered_device *dev,
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unsigned long age_secs)
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{
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struct cfg80211_internal_bss *bss;
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unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
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list_for_each_entry(bss, &dev->bss_list, list) {
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bss->ts -= age_jiffies;
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}
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}
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/* must hold dev->bss_lock! */
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static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
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struct cfg80211_internal_bss *bss)
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{
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list_del_init(&bss->list);
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rb_erase(&bss->rbn, &dev->bss_tree);
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kref_put(&bss->ref, bss_release);
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}
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/* must hold dev->bss_lock! */
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void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
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{
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struct cfg80211_internal_bss *bss, *tmp;
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bool expired = false;
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list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
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if (atomic_read(&bss->hold))
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continue;
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if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
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continue;
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__cfg80211_unlink_bss(dev, bss);
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expired = true;
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}
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if (expired)
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dev->bss_generation++;
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}
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const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
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{
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while (len > 2 && ies[0] != eid) {
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len -= ies[1] + 2;
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ies += ies[1] + 2;
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}
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if (len < 2)
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return NULL;
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if (len < 2 + ies[1])
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return NULL;
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return ies;
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}
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EXPORT_SYMBOL(cfg80211_find_ie);
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const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
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const u8 *ies, int len)
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{
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struct ieee80211_vendor_ie *ie;
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const u8 *pos = ies, *end = ies + len;
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int ie_oui;
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while (pos < end) {
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pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
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end - pos);
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if (!pos)
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return NULL;
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if (end - pos < sizeof(*ie))
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return NULL;
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ie = (struct ieee80211_vendor_ie *)pos;
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ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
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if (ie_oui == oui && ie->oui_type == oui_type)
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return pos;
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pos += 2 + ie->len;
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}
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return NULL;
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}
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EXPORT_SYMBOL(cfg80211_find_vendor_ie);
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static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
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{
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const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
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const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
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/* equal if both missing */
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if (!ie1 && !ie2)
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return 0;
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/* sort missing IE before (left of) present IE */
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if (!ie1)
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return -1;
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if (!ie2)
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return 1;
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/* sort by length first, then by contents */
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if (ie1[1] != ie2[1])
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return ie2[1] - ie1[1];
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return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
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}
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static bool is_bss(struct cfg80211_bss *a,
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const u8 *bssid,
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const u8 *ssid, size_t ssid_len)
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{
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const u8 *ssidie;
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if (bssid && !ether_addr_equal(a->bssid, bssid))
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return false;
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if (!ssid)
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return true;
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ssidie = cfg80211_find_ie(WLAN_EID_SSID,
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a->information_elements,
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a->len_information_elements);
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if (!ssidie)
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return false;
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if (ssidie[1] != ssid_len)
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return false;
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return memcmp(ssidie + 2, ssid, ssid_len) == 0;
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}
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static bool is_mesh_bss(struct cfg80211_bss *a)
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{
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const u8 *ie;
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if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
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return false;
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ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
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a->information_elements,
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a->len_information_elements);
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if (!ie)
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return false;
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ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
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a->information_elements,
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a->len_information_elements);
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if (!ie)
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return false;
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return true;
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}
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static bool is_mesh(struct cfg80211_bss *a,
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const u8 *meshid, size_t meshidlen,
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const u8 *meshcfg)
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{
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const u8 *ie;
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if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
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return false;
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ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
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a->information_elements,
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a->len_information_elements);
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if (!ie)
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return false;
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if (ie[1] != meshidlen)
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return false;
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if (memcmp(ie + 2, meshid, meshidlen))
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return false;
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ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
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a->information_elements,
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a->len_information_elements);
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if (!ie)
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return false;
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if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
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return false;
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/*
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* Ignore mesh capability (last two bytes of the IE) when
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* comparing since that may differ between stations taking
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* part in the same mesh.
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*/
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return memcmp(ie + 2, meshcfg,
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sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
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}
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static int cmp_bss_core(struct cfg80211_bss *a,
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struct cfg80211_bss *b)
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{
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int r;
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if (a->channel != b->channel)
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return b->channel->center_freq - a->channel->center_freq;
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if (is_mesh_bss(a) && is_mesh_bss(b)) {
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r = cmp_ies(WLAN_EID_MESH_ID,
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a->information_elements,
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a->len_information_elements,
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b->information_elements,
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b->len_information_elements);
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if (r)
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return r;
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return cmp_ies(WLAN_EID_MESH_CONFIG,
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a->information_elements,
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a->len_information_elements,
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b->information_elements,
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b->len_information_elements);
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}
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/*
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* we can't use compare_ether_addr here since we need a < > operator.
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* The binary return value of compare_ether_addr isn't enough
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*/
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return memcmp(a->bssid, b->bssid, sizeof(a->bssid));
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}
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static int cmp_bss(struct cfg80211_bss *a,
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struct cfg80211_bss *b)
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{
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int r;
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r = cmp_bss_core(a, b);
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if (r)
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return r;
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return cmp_ies(WLAN_EID_SSID,
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a->information_elements,
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a->len_information_elements,
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b->information_elements,
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b->len_information_elements);
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}
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static int cmp_hidden_bss(struct cfg80211_bss *a,
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struct cfg80211_bss *b)
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{
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const u8 *ie1;
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const u8 *ie2;
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int i;
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int r;
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r = cmp_bss_core(a, b);
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if (r)
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return r;
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ie1 = cfg80211_find_ie(WLAN_EID_SSID,
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a->information_elements,
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a->len_information_elements);
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ie2 = cfg80211_find_ie(WLAN_EID_SSID,
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b->information_elements,
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b->len_information_elements);
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/* Key comparator must use same algorithm in any rb-tree
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* search function (order is important), otherwise ordering
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* of items in the tree is broken and search gives incorrect
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* results. This code uses same order as cmp_ies() does. */
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/* sort missing IE before (left of) present IE */
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if (!ie1)
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return -1;
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if (!ie2)
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return 1;
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/* zero-size SSID is used as an indication of the hidden bss */
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if (!ie2[1])
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return 0;
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/* sort by length first, then by contents */
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if (ie1[1] != ie2[1])
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return ie2[1] - ie1[1];
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/* zeroed SSID ie is another indication of a hidden bss */
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for (i = 0; i < ie2[1]; i++)
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if (ie2[i + 2])
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return -1;
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return 0;
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}
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struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
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struct ieee80211_channel *channel,
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const u8 *bssid,
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const u8 *ssid, size_t ssid_len,
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u16 capa_mask, u16 capa_val)
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{
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struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
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struct cfg80211_internal_bss *bss, *res = NULL;
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unsigned long now = jiffies;
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spin_lock_bh(&dev->bss_lock);
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list_for_each_entry(bss, &dev->bss_list, list) {
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if ((bss->pub.capability & capa_mask) != capa_val)
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continue;
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if (channel && bss->pub.channel != channel)
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continue;
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/* Don't get expired BSS structs */
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if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
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!atomic_read(&bss->hold))
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continue;
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if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
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res = bss;
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kref_get(&res->ref);
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break;
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}
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}
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spin_unlock_bh(&dev->bss_lock);
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if (!res)
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return NULL;
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return &res->pub;
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}
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EXPORT_SYMBOL(cfg80211_get_bss);
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struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
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struct ieee80211_channel *channel,
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const u8 *meshid, size_t meshidlen,
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const u8 *meshcfg)
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{
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struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
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struct cfg80211_internal_bss *bss, *res = NULL;
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spin_lock_bh(&dev->bss_lock);
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list_for_each_entry(bss, &dev->bss_list, list) {
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if (channel && bss->pub.channel != channel)
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continue;
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if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
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res = bss;
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kref_get(&res->ref);
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break;
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}
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}
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spin_unlock_bh(&dev->bss_lock);
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if (!res)
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return NULL;
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return &res->pub;
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}
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EXPORT_SYMBOL(cfg80211_get_mesh);
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static void rb_insert_bss(struct cfg80211_registered_device *dev,
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struct cfg80211_internal_bss *bss)
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{
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struct rb_node **p = &dev->bss_tree.rb_node;
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struct rb_node *parent = NULL;
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struct cfg80211_internal_bss *tbss;
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int cmp;
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|
|
while (*p) {
|
|
parent = *p;
|
|
tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
|
|
|
|
cmp = cmp_bss(&bss->pub, &tbss->pub);
|
|
|
|
if (WARN_ON(!cmp)) {
|
|
/* will sort of leak this BSS */
|
|
return;
|
|
}
|
|
|
|
if (cmp < 0)
|
|
p = &(*p)->rb_left;
|
|
else
|
|
p = &(*p)->rb_right;
|
|
}
|
|
|
|
rb_link_node(&bss->rbn, parent, p);
|
|
rb_insert_color(&bss->rbn, &dev->bss_tree);
|
|
}
|
|
|
|
static struct cfg80211_internal_bss *
|
|
rb_find_bss(struct cfg80211_registered_device *dev,
|
|
struct cfg80211_internal_bss *res)
|
|
{
|
|
struct rb_node *n = dev->bss_tree.rb_node;
|
|
struct cfg80211_internal_bss *bss;
|
|
int r;
|
|
|
|
while (n) {
|
|
bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
|
|
r = cmp_bss(&res->pub, &bss->pub);
|
|
|
|
if (r == 0)
|
|
return bss;
|
|
else if (r < 0)
|
|
n = n->rb_left;
|
|
else
|
|
n = n->rb_right;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct cfg80211_internal_bss *
|
|
rb_find_hidden_bss(struct cfg80211_registered_device *dev,
|
|
struct cfg80211_internal_bss *res)
|
|
{
|
|
struct rb_node *n = dev->bss_tree.rb_node;
|
|
struct cfg80211_internal_bss *bss;
|
|
int r;
|
|
|
|
while (n) {
|
|
bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
|
|
r = cmp_hidden_bss(&res->pub, &bss->pub);
|
|
|
|
if (r == 0)
|
|
return bss;
|
|
else if (r < 0)
|
|
n = n->rb_left;
|
|
else
|
|
n = n->rb_right;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
copy_hidden_ies(struct cfg80211_internal_bss *res,
|
|
struct cfg80211_internal_bss *hidden)
|
|
{
|
|
if (unlikely(res->pub.beacon_ies))
|
|
return;
|
|
if (WARN_ON(!hidden->pub.beacon_ies))
|
|
return;
|
|
|
|
res->pub.beacon_ies = kmalloc(hidden->pub.len_beacon_ies, GFP_ATOMIC);
|
|
if (unlikely(!res->pub.beacon_ies))
|
|
return;
|
|
|
|
res->beacon_ies_allocated = true;
|
|
res->pub.len_beacon_ies = hidden->pub.len_beacon_ies;
|
|
memcpy(res->pub.beacon_ies, hidden->pub.beacon_ies,
|
|
res->pub.len_beacon_ies);
|
|
}
|
|
|
|
static struct cfg80211_internal_bss *
|
|
cfg80211_bss_update(struct cfg80211_registered_device *dev,
|
|
struct cfg80211_internal_bss *res)
|
|
{
|
|
struct cfg80211_internal_bss *found = NULL;
|
|
|
|
/*
|
|
* The reference to "res" is donated to this function.
|
|
*/
|
|
|
|
if (WARN_ON(!res->pub.channel)) {
|
|
kref_put(&res->ref, bss_release);
|
|
return NULL;
|
|
}
|
|
|
|
res->ts = jiffies;
|
|
|
|
spin_lock_bh(&dev->bss_lock);
|
|
|
|
found = rb_find_bss(dev, res);
|
|
|
|
if (found) {
|
|
found->pub.beacon_interval = res->pub.beacon_interval;
|
|
found->pub.tsf = res->pub.tsf;
|
|
found->pub.signal = res->pub.signal;
|
|
found->pub.capability = res->pub.capability;
|
|
found->ts = res->ts;
|
|
|
|
/* Update IEs */
|
|
if (res->pub.proberesp_ies) {
|
|
size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
|
|
size_t ielen = res->pub.len_proberesp_ies;
|
|
|
|
if (found->pub.proberesp_ies &&
|
|
!found->proberesp_ies_allocated &&
|
|
ksize(found) >= used + ielen) {
|
|
memcpy(found->pub.proberesp_ies,
|
|
res->pub.proberesp_ies, ielen);
|
|
found->pub.len_proberesp_ies = ielen;
|
|
} else {
|
|
u8 *ies = found->pub.proberesp_ies;
|
|
|
|
if (found->proberesp_ies_allocated)
|
|
ies = krealloc(ies, ielen, GFP_ATOMIC);
|
|
else
|
|
ies = kmalloc(ielen, GFP_ATOMIC);
|
|
|
|
if (ies) {
|
|
memcpy(ies, res->pub.proberesp_ies,
|
|
ielen);
|
|
found->proberesp_ies_allocated = true;
|
|
found->pub.proberesp_ies = ies;
|
|
found->pub.len_proberesp_ies = ielen;
|
|
}
|
|
}
|
|
|
|
/* Override possible earlier Beacon frame IEs */
|
|
found->pub.information_elements =
|
|
found->pub.proberesp_ies;
|
|
found->pub.len_information_elements =
|
|
found->pub.len_proberesp_ies;
|
|
}
|
|
if (res->pub.beacon_ies) {
|
|
size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
|
|
size_t ielen = res->pub.len_beacon_ies;
|
|
bool information_elements_is_beacon_ies =
|
|
(found->pub.information_elements ==
|
|
found->pub.beacon_ies);
|
|
|
|
if (found->pub.beacon_ies &&
|
|
!found->beacon_ies_allocated &&
|
|
ksize(found) >= used + ielen) {
|
|
memcpy(found->pub.beacon_ies,
|
|
res->pub.beacon_ies, ielen);
|
|
found->pub.len_beacon_ies = ielen;
|
|
} else {
|
|
u8 *ies = found->pub.beacon_ies;
|
|
|
|
if (found->beacon_ies_allocated)
|
|
ies = krealloc(ies, ielen, GFP_ATOMIC);
|
|
else
|
|
ies = kmalloc(ielen, GFP_ATOMIC);
|
|
|
|
if (ies) {
|
|
memcpy(ies, res->pub.beacon_ies,
|
|
ielen);
|
|
found->beacon_ies_allocated = true;
|
|
found->pub.beacon_ies = ies;
|
|
found->pub.len_beacon_ies = ielen;
|
|
}
|
|
}
|
|
|
|
/* Override IEs if they were from a beacon before */
|
|
if (information_elements_is_beacon_ies) {
|
|
found->pub.information_elements =
|
|
found->pub.beacon_ies;
|
|
found->pub.len_information_elements =
|
|
found->pub.len_beacon_ies;
|
|
}
|
|
}
|
|
|
|
kref_put(&res->ref, bss_release);
|
|
} else {
|
|
struct cfg80211_internal_bss *hidden;
|
|
|
|
/* First check if the beacon is a probe response from
|
|
* a hidden bss. If so, copy beacon ies (with nullified
|
|
* ssid) into the probe response bss entry (with real ssid).
|
|
* It is required basically for PSM implementation
|
|
* (probe responses do not contain tim ie) */
|
|
|
|
/* TODO: The code is not trying to update existing probe
|
|
* response bss entries when beacon ies are
|
|
* getting changed. */
|
|
hidden = rb_find_hidden_bss(dev, res);
|
|
if (hidden)
|
|
copy_hidden_ies(res, hidden);
|
|
|
|
/* this "consumes" the reference */
|
|
list_add_tail(&res->list, &dev->bss_list);
|
|
rb_insert_bss(dev, res);
|
|
found = res;
|
|
}
|
|
|
|
dev->bss_generation++;
|
|
spin_unlock_bh(&dev->bss_lock);
|
|
|
|
kref_get(&found->ref);
|
|
return found;
|
|
}
|
|
|
|
struct cfg80211_bss*
|
|
cfg80211_inform_bss(struct wiphy *wiphy,
|
|
struct ieee80211_channel *channel,
|
|
const u8 *bssid, u64 tsf, u16 capability,
|
|
u16 beacon_interval, const u8 *ie, size_t ielen,
|
|
s32 signal, gfp_t gfp)
|
|
{
|
|
struct cfg80211_internal_bss *res;
|
|
size_t privsz;
|
|
|
|
if (WARN_ON(!wiphy))
|
|
return NULL;
|
|
|
|
privsz = wiphy->bss_priv_size;
|
|
|
|
if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
|
|
(signal < 0 || signal > 100)))
|
|
return NULL;
|
|
|
|
res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
|
|
if (!res)
|
|
return NULL;
|
|
|
|
memcpy(res->pub.bssid, bssid, ETH_ALEN);
|
|
res->pub.channel = channel;
|
|
res->pub.signal = signal;
|
|
res->pub.tsf = tsf;
|
|
res->pub.beacon_interval = beacon_interval;
|
|
res->pub.capability = capability;
|
|
/*
|
|
* Since we do not know here whether the IEs are from a Beacon or Probe
|
|
* Response frame, we need to pick one of the options and only use it
|
|
* with the driver that does not provide the full Beacon/Probe Response
|
|
* frame. Use Beacon frame pointer to avoid indicating that this should
|
|
* override the information_elements pointer should we have received an
|
|
* earlier indication of Probe Response data.
|
|
*
|
|
* The initial buffer for the IEs is allocated with the BSS entry and
|
|
* is located after the private area.
|
|
*/
|
|
res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
|
|
memcpy(res->pub.beacon_ies, ie, ielen);
|
|
res->pub.len_beacon_ies = ielen;
|
|
res->pub.information_elements = res->pub.beacon_ies;
|
|
res->pub.len_information_elements = res->pub.len_beacon_ies;
|
|
|
|
kref_init(&res->ref);
|
|
|
|
res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
|
|
if (!res)
|
|
return NULL;
|
|
|
|
if (res->pub.capability & WLAN_CAPABILITY_ESS)
|
|
regulatory_hint_found_beacon(wiphy, channel, gfp);
|
|
|
|
/* cfg80211_bss_update gives us a referenced result */
|
|
return &res->pub;
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_inform_bss);
|
|
|
|
struct cfg80211_bss *
|
|
cfg80211_inform_bss_frame(struct wiphy *wiphy,
|
|
struct ieee80211_channel *channel,
|
|
struct ieee80211_mgmt *mgmt, size_t len,
|
|
s32 signal, gfp_t gfp)
|
|
{
|
|
struct cfg80211_internal_bss *res;
|
|
size_t ielen = len - offsetof(struct ieee80211_mgmt,
|
|
u.probe_resp.variable);
|
|
size_t privsz;
|
|
|
|
if (WARN_ON(!mgmt))
|
|
return NULL;
|
|
|
|
if (WARN_ON(!wiphy))
|
|
return NULL;
|
|
|
|
if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
|
|
(signal < 0 || signal > 100)))
|
|
return NULL;
|
|
|
|
if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
|
|
return NULL;
|
|
|
|
privsz = wiphy->bss_priv_size;
|
|
|
|
res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
|
|
if (!res)
|
|
return NULL;
|
|
|
|
memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
|
|
res->pub.channel = channel;
|
|
res->pub.signal = signal;
|
|
res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
|
|
res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
|
|
res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
|
|
/*
|
|
* The initial buffer for the IEs is allocated with the BSS entry and
|
|
* is located after the private area.
|
|
*/
|
|
if (ieee80211_is_probe_resp(mgmt->frame_control)) {
|
|
res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
|
|
memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
|
|
ielen);
|
|
res->pub.len_proberesp_ies = ielen;
|
|
res->pub.information_elements = res->pub.proberesp_ies;
|
|
res->pub.len_information_elements = res->pub.len_proberesp_ies;
|
|
} else {
|
|
res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
|
|
memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
|
|
res->pub.len_beacon_ies = ielen;
|
|
res->pub.information_elements = res->pub.beacon_ies;
|
|
res->pub.len_information_elements = res->pub.len_beacon_ies;
|
|
}
|
|
|
|
kref_init(&res->ref);
|
|
|
|
res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
|
|
if (!res)
|
|
return NULL;
|
|
|
|
if (res->pub.capability & WLAN_CAPABILITY_ESS)
|
|
regulatory_hint_found_beacon(wiphy, channel, gfp);
|
|
|
|
/* cfg80211_bss_update gives us a referenced result */
|
|
return &res->pub;
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_inform_bss_frame);
|
|
|
|
void cfg80211_ref_bss(struct cfg80211_bss *pub)
|
|
{
|
|
struct cfg80211_internal_bss *bss;
|
|
|
|
if (!pub)
|
|
return;
|
|
|
|
bss = container_of(pub, struct cfg80211_internal_bss, pub);
|
|
kref_get(&bss->ref);
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_ref_bss);
|
|
|
|
void cfg80211_put_bss(struct cfg80211_bss *pub)
|
|
{
|
|
struct cfg80211_internal_bss *bss;
|
|
|
|
if (!pub)
|
|
return;
|
|
|
|
bss = container_of(pub, struct cfg80211_internal_bss, pub);
|
|
kref_put(&bss->ref, bss_release);
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_put_bss);
|
|
|
|
void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
|
|
{
|
|
struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
|
|
struct cfg80211_internal_bss *bss;
|
|
|
|
if (WARN_ON(!pub))
|
|
return;
|
|
|
|
bss = container_of(pub, struct cfg80211_internal_bss, pub);
|
|
|
|
spin_lock_bh(&dev->bss_lock);
|
|
if (!list_empty(&bss->list)) {
|
|
__cfg80211_unlink_bss(dev, bss);
|
|
dev->bss_generation++;
|
|
}
|
|
spin_unlock_bh(&dev->bss_lock);
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_unlink_bss);
|
|
|
|
#ifdef CONFIG_CFG80211_WEXT
|
|
int cfg80211_wext_siwscan(struct net_device *dev,
|
|
struct iw_request_info *info,
|
|
union iwreq_data *wrqu, char *extra)
|
|
{
|
|
struct cfg80211_registered_device *rdev;
|
|
struct wiphy *wiphy;
|
|
struct iw_scan_req *wreq = NULL;
|
|
struct cfg80211_scan_request *creq = NULL;
|
|
int i, err, n_channels = 0;
|
|
enum ieee80211_band band;
|
|
|
|
if (!netif_running(dev))
|
|
return -ENETDOWN;
|
|
|
|
if (wrqu->data.length == sizeof(struct iw_scan_req))
|
|
wreq = (struct iw_scan_req *)extra;
|
|
|
|
rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
|
|
|
|
if (IS_ERR(rdev))
|
|
return PTR_ERR(rdev);
|
|
|
|
if (rdev->scan_req) {
|
|
err = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
wiphy = &rdev->wiphy;
|
|
|
|
/* Determine number of channels, needed to allocate creq */
|
|
if (wreq && wreq->num_channels)
|
|
n_channels = wreq->num_channels;
|
|
else {
|
|
for (band = 0; band < IEEE80211_NUM_BANDS; band++)
|
|
if (wiphy->bands[band])
|
|
n_channels += wiphy->bands[band]->n_channels;
|
|
}
|
|
|
|
creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
|
|
n_channels * sizeof(void *),
|
|
GFP_ATOMIC);
|
|
if (!creq) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
creq->wiphy = wiphy;
|
|
creq->wdev = dev->ieee80211_ptr;
|
|
/* SSIDs come after channels */
|
|
creq->ssids = (void *)&creq->channels[n_channels];
|
|
creq->n_channels = n_channels;
|
|
creq->n_ssids = 1;
|
|
|
|
/* translate "Scan on frequencies" request */
|
|
i = 0;
|
|
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
|
|
int j;
|
|
|
|
if (!wiphy->bands[band])
|
|
continue;
|
|
|
|
for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
|
|
/* ignore disabled channels */
|
|
if (wiphy->bands[band]->channels[j].flags &
|
|
IEEE80211_CHAN_DISABLED)
|
|
continue;
|
|
|
|
/* If we have a wireless request structure and the
|
|
* wireless request specifies frequencies, then search
|
|
* for the matching hardware channel.
|
|
*/
|
|
if (wreq && wreq->num_channels) {
|
|
int k;
|
|
int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
|
|
for (k = 0; k < wreq->num_channels; k++) {
|
|
int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
|
|
if (wext_freq == wiphy_freq)
|
|
goto wext_freq_found;
|
|
}
|
|
goto wext_freq_not_found;
|
|
}
|
|
|
|
wext_freq_found:
|
|
creq->channels[i] = &wiphy->bands[band]->channels[j];
|
|
i++;
|
|
wext_freq_not_found: ;
|
|
}
|
|
}
|
|
/* No channels found? */
|
|
if (!i) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Set real number of channels specified in creq->channels[] */
|
|
creq->n_channels = i;
|
|
|
|
/* translate "Scan for SSID" request */
|
|
if (wreq) {
|
|
if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
|
|
if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
|
|
creq->ssids[0].ssid_len = wreq->essid_len;
|
|
}
|
|
if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
|
|
creq->n_ssids = 0;
|
|
}
|
|
|
|
for (i = 0; i < IEEE80211_NUM_BANDS; i++)
|
|
if (wiphy->bands[i])
|
|
creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
|
|
|
|
rdev->scan_req = creq;
|
|
err = rdev->ops->scan(wiphy, creq);
|
|
if (err) {
|
|
rdev->scan_req = NULL;
|
|
/* creq will be freed below */
|
|
} else {
|
|
nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
|
|
/* creq now owned by driver */
|
|
creq = NULL;
|
|
dev_hold(dev);
|
|
}
|
|
out:
|
|
kfree(creq);
|
|
cfg80211_unlock_rdev(rdev);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
|
|
|
|
static void ieee80211_scan_add_ies(struct iw_request_info *info,
|
|
struct cfg80211_bss *bss,
|
|
char **current_ev, char *end_buf)
|
|
{
|
|
u8 *pos, *end, *next;
|
|
struct iw_event iwe;
|
|
|
|
if (!bss->information_elements ||
|
|
!bss->len_information_elements)
|
|
return;
|
|
|
|
/*
|
|
* If needed, fragment the IEs buffer (at IE boundaries) into short
|
|
* enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
|
|
*/
|
|
pos = bss->information_elements;
|
|
end = pos + bss->len_information_elements;
|
|
|
|
while (end - pos > IW_GENERIC_IE_MAX) {
|
|
next = pos + 2 + pos[1];
|
|
while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
|
|
next = next + 2 + next[1];
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVGENIE;
|
|
iwe.u.data.length = next - pos;
|
|
*current_ev = iwe_stream_add_point(info, *current_ev,
|
|
end_buf, &iwe, pos);
|
|
|
|
pos = next;
|
|
}
|
|
|
|
if (end > pos) {
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVGENIE;
|
|
iwe.u.data.length = end - pos;
|
|
*current_ev = iwe_stream_add_point(info, *current_ev,
|
|
end_buf, &iwe, pos);
|
|
}
|
|
}
|
|
|
|
static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
|
|
{
|
|
unsigned long end = jiffies;
|
|
|
|
if (end >= start)
|
|
return jiffies_to_msecs(end - start);
|
|
|
|
return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
|
|
}
|
|
|
|
static char *
|
|
ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
|
|
struct cfg80211_internal_bss *bss, char *current_ev,
|
|
char *end_buf)
|
|
{
|
|
struct iw_event iwe;
|
|
u8 *buf, *cfg, *p;
|
|
u8 *ie = bss->pub.information_elements;
|
|
int rem = bss->pub.len_information_elements, i, sig;
|
|
bool ismesh = false;
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWAP;
|
|
iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
|
|
memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
|
|
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
|
|
IW_EV_ADDR_LEN);
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWFREQ;
|
|
iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
|
|
iwe.u.freq.e = 0;
|
|
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
|
|
IW_EV_FREQ_LEN);
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWFREQ;
|
|
iwe.u.freq.m = bss->pub.channel->center_freq;
|
|
iwe.u.freq.e = 6;
|
|
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
|
|
IW_EV_FREQ_LEN);
|
|
|
|
if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVQUAL;
|
|
iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
|
|
IW_QUAL_NOISE_INVALID |
|
|
IW_QUAL_QUAL_UPDATED;
|
|
switch (wiphy->signal_type) {
|
|
case CFG80211_SIGNAL_TYPE_MBM:
|
|
sig = bss->pub.signal / 100;
|
|
iwe.u.qual.level = sig;
|
|
iwe.u.qual.updated |= IW_QUAL_DBM;
|
|
if (sig < -110) /* rather bad */
|
|
sig = -110;
|
|
else if (sig > -40) /* perfect */
|
|
sig = -40;
|
|
/* will give a range of 0 .. 70 */
|
|
iwe.u.qual.qual = sig + 110;
|
|
break;
|
|
case CFG80211_SIGNAL_TYPE_UNSPEC:
|
|
iwe.u.qual.level = bss->pub.signal;
|
|
/* will give range 0 .. 100 */
|
|
iwe.u.qual.qual = bss->pub.signal;
|
|
break;
|
|
default:
|
|
/* not reached */
|
|
break;
|
|
}
|
|
current_ev = iwe_stream_add_event(info, current_ev, end_buf,
|
|
&iwe, IW_EV_QUAL_LEN);
|
|
}
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWENCODE;
|
|
if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
|
|
iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
|
|
else
|
|
iwe.u.data.flags = IW_ENCODE_DISABLED;
|
|
iwe.u.data.length = 0;
|
|
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
|
|
&iwe, "");
|
|
|
|
while (rem >= 2) {
|
|
/* invalid data */
|
|
if (ie[1] > rem - 2)
|
|
break;
|
|
|
|
switch (ie[0]) {
|
|
case WLAN_EID_SSID:
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWESSID;
|
|
iwe.u.data.length = ie[1];
|
|
iwe.u.data.flags = 1;
|
|
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
|
|
&iwe, ie + 2);
|
|
break;
|
|
case WLAN_EID_MESH_ID:
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWESSID;
|
|
iwe.u.data.length = ie[1];
|
|
iwe.u.data.flags = 1;
|
|
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
|
|
&iwe, ie + 2);
|
|
break;
|
|
case WLAN_EID_MESH_CONFIG:
|
|
ismesh = true;
|
|
if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
|
|
break;
|
|
buf = kmalloc(50, GFP_ATOMIC);
|
|
if (!buf)
|
|
break;
|
|
cfg = ie + 2;
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVCUSTOM;
|
|
sprintf(buf, "Mesh Network Path Selection Protocol ID: "
|
|
"0x%02X", cfg[0]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Path Selection Metric ID: 0x%02X",
|
|
cfg[1]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Congestion Control Mode ID: 0x%02X",
|
|
cfg[2]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf,
|
|
&iwe, buf);
|
|
kfree(buf);
|
|
break;
|
|
case WLAN_EID_SUPP_RATES:
|
|
case WLAN_EID_EXT_SUPP_RATES:
|
|
/* display all supported rates in readable format */
|
|
p = current_ev + iwe_stream_lcp_len(info);
|
|
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWRATE;
|
|
/* Those two flags are ignored... */
|
|
iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
|
|
|
|
for (i = 0; i < ie[1]; i++) {
|
|
iwe.u.bitrate.value =
|
|
((ie[i + 2] & 0x7f) * 500000);
|
|
p = iwe_stream_add_value(info, current_ev, p,
|
|
end_buf, &iwe, IW_EV_PARAM_LEN);
|
|
}
|
|
current_ev = p;
|
|
break;
|
|
}
|
|
rem -= ie[1] + 2;
|
|
ie += ie[1] + 2;
|
|
}
|
|
|
|
if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
|
|
ismesh) {
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = SIOCGIWMODE;
|
|
if (ismesh)
|
|
iwe.u.mode = IW_MODE_MESH;
|
|
else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
|
|
iwe.u.mode = IW_MODE_MASTER;
|
|
else
|
|
iwe.u.mode = IW_MODE_ADHOC;
|
|
current_ev = iwe_stream_add_event(info, current_ev, end_buf,
|
|
&iwe, IW_EV_UINT_LEN);
|
|
}
|
|
|
|
buf = kmalloc(30, GFP_ATOMIC);
|
|
if (buf) {
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVCUSTOM;
|
|
sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
|
|
&iwe, buf);
|
|
memset(&iwe, 0, sizeof(iwe));
|
|
iwe.cmd = IWEVCUSTOM;
|
|
sprintf(buf, " Last beacon: %ums ago",
|
|
elapsed_jiffies_msecs(bss->ts));
|
|
iwe.u.data.length = strlen(buf);
|
|
current_ev = iwe_stream_add_point(info, current_ev,
|
|
end_buf, &iwe, buf);
|
|
kfree(buf);
|
|
}
|
|
|
|
ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf);
|
|
|
|
return current_ev;
|
|
}
|
|
|
|
|
|
static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
|
|
struct iw_request_info *info,
|
|
char *buf, size_t len)
|
|
{
|
|
char *current_ev = buf;
|
|
char *end_buf = buf + len;
|
|
struct cfg80211_internal_bss *bss;
|
|
|
|
spin_lock_bh(&dev->bss_lock);
|
|
cfg80211_bss_expire(dev);
|
|
|
|
list_for_each_entry(bss, &dev->bss_list, list) {
|
|
if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
|
|
spin_unlock_bh(&dev->bss_lock);
|
|
return -E2BIG;
|
|
}
|
|
current_ev = ieee80211_bss(&dev->wiphy, info, bss,
|
|
current_ev, end_buf);
|
|
}
|
|
spin_unlock_bh(&dev->bss_lock);
|
|
return current_ev - buf;
|
|
}
|
|
|
|
|
|
int cfg80211_wext_giwscan(struct net_device *dev,
|
|
struct iw_request_info *info,
|
|
struct iw_point *data, char *extra)
|
|
{
|
|
struct cfg80211_registered_device *rdev;
|
|
int res;
|
|
|
|
if (!netif_running(dev))
|
|
return -ENETDOWN;
|
|
|
|
rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
|
|
|
|
if (IS_ERR(rdev))
|
|
return PTR_ERR(rdev);
|
|
|
|
if (rdev->scan_req) {
|
|
res = -EAGAIN;
|
|
goto out;
|
|
}
|
|
|
|
res = ieee80211_scan_results(rdev, info, extra, data->length);
|
|
data->length = 0;
|
|
if (res >= 0) {
|
|
data->length = res;
|
|
res = 0;
|
|
}
|
|
|
|
out:
|
|
cfg80211_unlock_rdev(rdev);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
|
|
#endif
|