--- /dev/null
+/*
+ * Scanning routines.
+ *
+ * These are not exported because they're assigned to the function pointers.
+ *
+ * Copyright (c) 2005, 2006 Johannes Berg <johannes@sipsolutions.net>
+ * Joseph Jezak <josejx@gentoo.org>
+ * Larry Finger <Larry.Finger@lwfinger.net>
+ * Danny van Dyk <kugelfang@gentoo.org>
+ * Michael Buesch <mbuesch@freenet.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called COPYING.
+ */
+
+#include <linux/completion.h>
+#include "ieee80211softmac_priv.h"
+
+/* internal, use to trigger scanning if needed.
+ * Returns -EBUSY if already scanning,
+ * result of start_scan otherwise */
+int
+ieee80211softmac_start_scan(struct ieee80211softmac_device *sm)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&sm->lock, flags);
+ if (sm->scanning)
+ {
+ spin_unlock_irqrestore(&sm->lock, flags);
+ return -EINPROGRESS;
+ }
+ sm->scanning = 1;
+ spin_unlock_irqrestore(&sm->lock, flags);
+
+ netif_tx_disable(sm->ieee->dev);
+ ret = sm->start_scan(sm->dev);
+ if (ret) {
+ spin_lock_irqsave(&sm->lock, flags);
+ sm->scanning = 0;
+ spin_unlock_irqrestore(&sm->lock, flags);
+ }
+ return ret;
+}
+
+void
+ieee80211softmac_stop_scan(struct ieee80211softmac_device *sm)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&sm->lock, flags);
+
+ if (!sm->scanning) {
+ spin_unlock_irqrestore(&sm->lock, flags);
+ return;
+ }
+
+ spin_unlock_irqrestore(&sm->lock, flags);
+ sm->stop_scan(sm->dev);
+}
+
+void
+ieee80211softmac_wait_for_scan(struct ieee80211softmac_device *sm)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&sm->lock, flags);
+
+ if (!sm->scanning) {
+ spin_unlock_irqrestore(&sm->lock, flags);
+ return;
+ }
+
+ spin_unlock_irqrestore(&sm->lock, flags);
+ sm->wait_for_scan(sm->dev);
+}
+
+
+/* internal scanning implementation follows */
+void ieee80211softmac_scan(void *d)
+{
+ int invalid_channel;
+ u8 current_channel_idx;
+ struct ieee80211softmac_device *sm = (struct ieee80211softmac_device *)d;
+ struct ieee80211softmac_scaninfo *si = sm->scaninfo;
+ unsigned long flags;
+
+ while (!(si->stop) && (si->current_channel_idx < si->number_channels)) {
+ current_channel_idx = si->current_channel_idx;
+ si->current_channel_idx++; /* go to the next channel */
+
+ invalid_channel = (si->skip_flags & si->channels[current_channel_idx].flags);
+
+ if (!invalid_channel) {
+ sm->set_channel(sm->dev, si->channels[current_channel_idx].channel);
+ // FIXME make this user configurable (active/passive)
+ if(ieee80211softmac_send_mgt_frame(sm, NULL, IEEE80211_STYPE_PROBE_REQ, 0))
+ printkl(KERN_DEBUG PFX "Sending Probe Request Failed\n");
+
+ /* also send directed management frame for the network we're looking for */
+ // TODO: is this if correct, or should we do this only if scanning from assoc request?
+ if (sm->associnfo.req_essid.len)
+ ieee80211softmac_send_mgt_frame(sm, &sm->associnfo.req_essid, IEEE80211_STYPE_PROBE_REQ, 0);
+
+ spin_lock_irqsave(&sm->lock, flags);
+ if (unlikely(!sm->running)) {
+ /* Prevent reschedule on workqueue flush */
+ spin_unlock_irqrestore(&sm->lock, flags);
+ break;
+ }
+ schedule_delayed_work(&si->softmac_scan, IEEE80211SOFTMAC_PROBE_DELAY);
+ spin_unlock_irqrestore(&sm->lock, flags);
+ return;
+ } else {
+ dprintk(PFX "Not probing Channel %d (not allowed here)\n", si->channels[current_channel_idx].channel);
+ }
+ }
+
+ spin_lock_irqsave(&sm->lock, flags);
+ cancel_delayed_work(&si->softmac_scan);
+ si->started = 0;
+ spin_unlock_irqrestore(&sm->lock, flags);
+
+ dprintk(PFX "Scanning finished\n");
+ ieee80211softmac_scan_finished(sm);
+ complete_all(&sm->scaninfo->finished);
+}
+
+static inline struct ieee80211softmac_scaninfo *allocate_scaninfo(struct ieee80211softmac_device *mac)
+{
+ /* ugh. can we call this without having the spinlock held? */
+ struct ieee80211softmac_scaninfo *info = kmalloc(sizeof(struct ieee80211softmac_scaninfo), GFP_ATOMIC);
+ if (unlikely(!info))
+ return NULL;
+ INIT_WORK(&info->softmac_scan, ieee80211softmac_scan, mac);
+ init_completion(&info->finished);
+ return info;
+}
+
+int ieee80211softmac_start_scan_implementation(struct net_device *dev)
+{
+ struct ieee80211softmac_device *sm = ieee80211_priv(dev);
+ unsigned long flags;
+
+ if (!(dev->flags & IFF_UP))
+ return -ENODEV;
+
+ assert(ieee80211softmac_scan_handlers_check_self(sm));
+ if (!ieee80211softmac_scan_handlers_check_self(sm))
+ return -EINVAL;
+
+ spin_lock_irqsave(&sm->lock, flags);
+ /* it looks like we need to hold the lock here
+ * to make sure we don't allocate two of these... */
+ if (unlikely(!sm->scaninfo))
+ sm->scaninfo = allocate_scaninfo(sm);
+ if (unlikely(!sm->scaninfo)) {
+ spin_unlock_irqrestore(&sm->lock, flags);
+ return -ENOMEM;
+ }
+
+ sm->scaninfo->skip_flags = IEEE80211_CH_INVALID;
+ if (0 /* not scanning in IEEE802.11b */)//TODO
+ sm->scaninfo->skip_flags |= IEEE80211_CH_B_ONLY;
+ if (0 /* IEEE802.11a */) {//TODO
+ sm->scaninfo->channels = sm->ieee->geo.a;
+ sm->scaninfo->number_channels = sm->ieee->geo.a_channels;
+ } else {
+ sm->scaninfo->channels = sm->ieee->geo.bg;
+ sm->scaninfo->number_channels = sm->ieee->geo.bg_channels;
+ }
+ dprintk(PFX "Start scanning with channel: %d\n", sm->scaninfo->channels[0].channel);
+ dprintk(PFX "Scanning %d channels\n", sm->scaninfo->number_channels);
+ sm->scaninfo->current_channel_idx = 0;
+ sm->scaninfo->started = 1;
+ sm->scaninfo->stop = 0;
+ INIT_COMPLETION(sm->scaninfo->finished);
+ schedule_work(&sm->scaninfo->softmac_scan);
+ spin_unlock_irqrestore(&sm->lock, flags);
+ return 0;
+}
+
+void ieee80211softmac_stop_scan_implementation(struct net_device *dev)
+{
+ struct ieee80211softmac_device *sm = ieee80211_priv(dev);
+ unsigned long flags;
+
+ assert(ieee80211softmac_scan_handlers_check_self(sm));
+ if (!ieee80211softmac_scan_handlers_check_self(sm))
+ return;
+
+ spin_lock_irqsave(&sm->lock, flags);
+ assert(sm->scaninfo != NULL);
+ if (sm->scaninfo) {
+ if (sm->scaninfo->started)
+ sm->scaninfo->stop = 1;
+ else
+ complete_all(&sm->scaninfo->finished);
+ }
+ spin_unlock_irqrestore(&sm->lock, flags);
+}
+
+void ieee80211softmac_wait_for_scan_implementation(struct net_device *dev)
+{
+ struct ieee80211softmac_device *sm = ieee80211_priv(dev);
+ unsigned long flags;
+
+ assert(ieee80211softmac_scan_handlers_check_self(sm));
+ if (!ieee80211softmac_scan_handlers_check_self(sm))
+ return;
+
+ spin_lock_irqsave(&sm->lock, flags);
+ if (!sm->scaninfo->started) {
+ spin_unlock_irqrestore(&sm->lock, flags);
+ return;
+ }
+ spin_unlock_irqrestore(&sm->lock, flags);
+ wait_for_completion(&sm->scaninfo->finished);
+}
+
+/* this is what drivers (that do scanning) call when they're done */
+void ieee80211softmac_scan_finished(struct ieee80211softmac_device *sm)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&sm->lock, flags);
+ sm->scanning = 0;
+ spin_unlock_irqrestore(&sm->lock, flags);
+
+ if (sm->associnfo.bssvalid) {
+ struct ieee80211softmac_network *net;
+
+ net = ieee80211softmac_get_network_by_bssid(sm, sm->associnfo.bssid);
+ if (net)
+ sm->set_channel(sm->dev, net->channel);
+ }
+ netif_wake_queue(sm->ieee->dev);
+ ieee80211softmac_call_events(sm, IEEE80211SOFTMAC_EVENT_SCAN_FINISHED, NULL);
+}
+EXPORT_SYMBOL_GPL(ieee80211softmac_scan_finished);
git://git.onelab.eu / linux-2.6.git / blobdiff