[PATCH] wireless: Add softmac layer to the kernel

Signed-off-by: John W. Linville <linville@tuxdriver.com>

include/net/ieee80211softmac.h

+#ifndef IEEE80211SOFTMAC_H_
+#define IEEE80211SOFTMAC_H_
+
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/list.h>
+#include <net/ieee80211.h>
+
+/* Once the API is considered more or less stable,
+ * this should be incremented on API incompatible changes.
+ */
+#define IEEE80211SOFTMAC_API	0
+
+#define IEEE80211SOFTMAC_MAX_RATES_LEN		8
+#define IEEE80211SOFTMAC_MAX_EX_RATES_LEN	255
+
+struct ieee80211softmac_ratesinfo {
+	u8 count;
+	u8 rates[IEEE80211SOFTMAC_MAX_RATES_LEN + IEEE80211SOFTMAC_MAX_EX_RATES_LEN];
+};
+
+/* internal structures */
+struct ieee80211softmac_network;
+struct ieee80211softmac_scaninfo;
+
+struct ieee80211softmac_essid {
+	u8 len;
+	char data[IW_ESSID_MAX_SIZE+1];
+};
+
+struct ieee80211softmac_wpa {
+	char *IE;
+	int IElen;
+	int IEbuflen;
+};
+
+/*
+ * Information about association
+ *
+ * Do we need a lock for this?
+ * We only ever use this structure inlined
+ * into our global struct. I've used its lock,
+ * but maybe we need a local one here?
+ */
+struct ieee80211softmac_assoc_info {
+	/*
+	 * This is the requested ESSID. It is written
+	 * only by the WX handlers.
+	 *
+	 */
+	struct ieee80211softmac_essid req_essid;
+	/*
+	 * the ESSID of the network we're currently
+	 * associated (or trying) to. This is
+	 * updated to the network's actual ESSID
+	 * even if the requested ESSID was 'ANY'
+	 */
+	struct ieee80211softmac_essid associate_essid;
+	
+	/* BSSID we're trying to associate to */
+	char bssid[ETH_ALEN];
+	
+	/* some flags.
+	 * static_essid is valid if the essid is constant,
+	 * this is for use by the wx handlers only.
+	 *
+	 * associating is true, if the network has been
+	 * auth'ed on and we are in the process of associating.
+	 *
+	 * bssvalid is true if we found a matching network
+	 * and saved it's BSSID into the bssid above.
+	 */
+	u8 static_essid:1,
+	   associating:1,
+	   bssvalid:1;
+
+	/* Scan retries remaining */
+	int scan_retry;
+
+	struct work_struct work;
+	struct work_struct timeout;
+};
+
+enum {
+	IEEE80211SOFTMAC_AUTH_OPEN_REQUEST	= 1,
+	IEEE80211SOFTMAC_AUTH_OPEN_RESPONSE	= 2,
+};
+
+enum {
+	IEEE80211SOFTMAC_AUTH_SHARED_REQUEST	= 1,
+	IEEE80211SOFTMAC_AUTH_SHARED_CHALLENGE = 2,
+	IEEE80211SOFTMAC_AUTH_SHARED_RESPONSE	= 3,
+	IEEE80211SOFTMAC_AUTH_SHARED_PASS	= 4,
+};
+
+/* We should make these tunable
+ * AUTH_TIMEOUT seems really long, but that's what it is in BSD */
+#define IEEE80211SOFTMAC_AUTH_TIMEOUT		(12 * HZ)
+#define IEEE80211SOFTMAC_AUTH_RETRY_LIMIT	5
+#define IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT	3
+
+struct ieee80211softmac_txrates {
+	/* The Bit-Rate to be used for multicast frames. */
+	u8 mcast_rate;
+	/* The Bit-Rate to be used for multicast fallback
+	 * (If the device supports fallback and hardware-retry)
+	 */
+	u8 mcast_fallback;
+	/* The Bit-Rate to be used for any other (normal) data packet. */
+	u8 default_rate;
+	/* The Bit-Rate to be used for default fallback
+	 * (If the device supports fallback and hardware-retry)
+	 */
+	u8 default_fallback;
+};
+
+/* Bits for txrates_change callback. */
+#define IEEE80211SOFTMAC_TXRATECHG_DEFAULT		(1 << 0) /* default_rate */
+#define IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK	(1 << 1) /* default_fallback */
+#define IEEE80211SOFTMAC_TXRATECHG_MCAST		(1 << 2) /* mcast_rate */
+#define IEEE80211SOFTMAC_TXRATECHG_MCAST_FBACK		(1 << 3) /* mcast_fallback */
+
+struct ieee80211softmac_device {
+	/* 802.11 structure for data stuff */
+	struct ieee80211_device *ieee;
+	struct net_device *dev;
+
+	/* only valid if associated, then holds the Association ID */
+	u16 association_id;
+	
+	/* the following methods are callbacks that the driver
+	 * using this framework has to assign
+	 */
+
+	/* always assign these */
+	void (*set_bssid_filter)(struct net_device *dev, const u8 *bssid);
+	void (*set_channel)(struct net_device *dev, u8 channel);
+
+	/* assign if you need it, informational only */
+	void (*link_change)(struct net_device *dev);
+
+	/* If the hardware can do scanning, assign _all_ three of these callbacks.
+	 * When the scan finishes, call ieee80211softmac_scan_finished().
+	 */
+	
+	/* when called, start_scan is guaranteed to not be called again
+	 * until you call ieee80211softmac_scan_finished.
+	 * Return 0 if scanning could start, error otherwise.
+	 * SOFTMAC AUTHORS: don't call this, use ieee80211softmac_start_scan */
+	int (*start_scan)(struct net_device *dev);
+	/* this should block until after ieee80211softmac_scan_finished was called
+	 * SOFTMAC AUTHORS: don't call this, use ieee80211softmac_wait_for_scan */
+	void (*wait_for_scan)(struct net_device *dev);
+	/* stop_scan aborts a scan, but is asynchronous.
+	 * if you want to wait for it too, use wait_for_scan
+	 * SOFTMAC AUTHORS: don't call this, use ieee80211softmac_stop_scan */
+	void (*stop_scan)(struct net_device *dev);
+
+	/* we'll need something about beacons here too, for AP or ad-hoc modes */
+
+	/* Transmission rates to be used by the driver.
+	 * The SoftMAC figures out the best possible rates.
+	 * The driver just needs to read them.
+	 */
+	struct ieee80211softmac_txrates txrates;
+	/* If the driver needs to do stuff on TX rate changes, assign this callback. */
+	void (*txrates_change)(struct net_device *dev,
+			       u32 changes, /* see IEEE80211SOFTMAC_TXRATECHG flags */
+			       const struct ieee80211softmac_txrates *rates_before_change);
+
+	/* private stuff follows */
+	/* this lock protects this structure */
+	spinlock_t lock;
+	
+	/* couple of flags */
+	u8 scanning:1, /* protects scanning from being done multiple times at once */
+	   associated:1;
+	
+	/* workquere for scannning, ... */
+	struct workqueue_struct	*workqueue;
+
+	struct ieee80211softmac_scaninfo *scaninfo;
+	struct ieee80211softmac_assoc_info associnfo;
+
+	struct list_head auth_queue;
+	struct list_head events;
+
+ 	struct ieee80211softmac_ratesinfo ratesinfo;
+	int txrate_badness;
+	
+	/* WPA stuff */
+	struct ieee80211softmac_wpa wpa;
+
+	/* we need to keep a list of network structs we copied */
+	struct list_head network_list;
+	
+	/* This must be the last item so that it points to the data
+	 * allocated beyond this structure by alloc_ieee80211 */
+	u8 priv[0];
+};
+
+extern void ieee80211softmac_scan_finished(struct ieee80211softmac_device *sm);
+
+static inline void * ieee80211softmac_priv(struct net_device *dev)
+{
+	return ((struct ieee80211softmac_device *)ieee80211_priv(dev))->priv;
+}
+
+extern struct net_device * alloc_ieee80211softmac(int sizeof_priv);
+extern void free_ieee80211softmac(struct net_device *dev);
+
+/* Call this function if you detect a lost TX fragment.
+ * (If the device indicates failure of ACK RX, for example.)
+ * It is wise to call this function if you are able to detect lost packets,
+ * because it contributes to the TX Rates auto adjustment.
+ */
+extern void ieee80211softmac_fragment_lost(struct net_device *dev,
+					   u16 wireless_sequence_number);
+/* Call this function before _start to tell the softmac what rates
+ * the hw supports. The rates parameter is copied, so you can
+ * free it right after calling this function. 
+ * Note that the rates need to be sorted. */
+extern void ieee80211softmac_set_rates(struct net_device *dev, u8 count, u8 *rates);
+
+/* Start the SoftMAC. Call this after you initialized the device
+ * and it is ready to run.
+ */
+extern void ieee80211softmac_start(struct net_device *dev);
+/* Stop the SoftMAC. Call this before you shutdown the device. */
+extern void ieee80211softmac_stop(struct net_device *dev);
+
+/*
+ * Event system
+ */
+
+/* valid event types */
+#define IEEE80211SOFTMAC_EVENT_ANY			-1 /*private use only*/
+#define IEEE80211SOFTMAC_EVENT_SCAN_FINISHED		0
+#define IEEE80211SOFTMAC_EVENT_ASSOCIATED		1
+#define IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED		2
+#define IEEE80211SOFTMAC_EVENT_ASSOCIATE_TIMEOUT	3
+#define IEEE80211SOFTMAC_EVENT_AUTHENTICATED		4
+#define IEEE80211SOFTMAC_EVENT_AUTH_FAILED		5
+#define IEEE80211SOFTMAC_EVENT_AUTH_TIMEOUT		6
+#define IEEE80211SOFTMAC_EVENT_ASSOCIATE_NET_NOT_FOUND	7
+/* keep this updated! */
+#define IEEE80211SOFTMAC_EVENT_LAST			7
+/*
+ * If you want to be notified of certain events, you can call
+ * ieee80211softmac_notify[_atomic] with
+ * 	- event set to one of the constants below
+ * 	- fun set to a function pointer of the appropriate type
+ *	- context set to the context data you want passed
+ * The return value is 0, or an error.
+ */
+typedef void (*notify_function_ptr)(struct net_device *dev, void *context);
+
+#define ieee80211softmac_notify(dev, event, fun, context) ieee80211softmac_notify_gfp(dev, event, fun, context, GFP_KERNEL);
+#define ieee80211softmac_notify_atomic(dev, event, fun, context) ieee80211softmac_notify_gfp(dev, event, fun, context, GFP_ATOMIC);
+
+extern int ieee80211softmac_notify_gfp(struct net_device *dev,
+	int event, notify_function_ptr fun, void *context, gfp_t gfp_mask);
+
+/* To clear pending work (for ifconfig down, etc.) */
+extern void
+ieee80211softmac_clear_pending_work(struct ieee80211softmac_device *sm);
+
+#endif /* IEEE80211SOFTMAC_H_ */

include/net/ieee80211softmac_wx.h

+#ifndef _IEEE80211SOFTMAC_WX_H
+#define _IEEE80211SOFTMAC_WX_H
+
+#include <net/ieee80211softmac.h>
+#include <net/iw_handler.h>
+
+extern int
+ieee80211softmac_wx_trigger_scan(struct net_device *net_dev,
+				 struct iw_request_info *info,
+				 union iwreq_data *data,
+				 char *extra);
+
+extern int
+ieee80211softmac_wx_get_scan_results(struct net_device *net_dev,
+				     struct iw_request_info *info,
+				     union iwreq_data *data,
+				     char *extra);
+
+extern int
+ieee80211softmac_wx_set_essid(struct net_device *net_dev,
+			      struct iw_request_info *info,
+			      union iwreq_data *data,
+			      char *extra);
+
+extern int
+ieee80211softmac_wx_get_essid(struct net_device *net_dev,
+			      struct iw_request_info *info,
+			      union iwreq_data *data,
+			      char *extra);
+
+extern int
+ieee80211softmac_wx_set_rate(struct net_device *net_dev,
+			     struct iw_request_info *info,
+			     union iwreq_data *data,
+			     char *extra);
+
+extern int
+ieee80211softmac_wx_get_rate(struct net_device *net_dev,
+			     struct iw_request_info *info,
+			     union iwreq_data *data,
+			     char *extra);
+
+extern int
+ieee80211softmac_wx_get_wap(struct net_device *net_dev,
+			      struct iw_request_info *info,
+			      union iwreq_data *data,
+			      char *extra);
+
+extern int
+ieee80211softmac_wx_set_wap(struct net_device *net_dev,
+			      struct iw_request_info *info,
+			      union iwreq_data *data,
+			      char *extra);
+
+extern int
+ieee80211softmac_wx_set_genie(struct net_device *dev,
+			      struct iw_request_info *info,
+			      union iwreq_data *wrqu,
+			      char *extra);
+
+extern int
+ieee80211softmac_wx_get_genie(struct net_device *dev,
+			      struct iw_request_info *info,
+			      union iwreq_data *wrqu,
+			      char *extra);
+#endif /* _IEEE80211SOFTMAC_WX */

net/ieee80211/Kconfig

@@ -66,3 +66,4 @@ config IEEE80211_CRYPT_TKIP
 	This can be compiled as a modules and it will be called
 	"ieee80211_crypt_tkip".
 
+source "net/ieee80211/softmac/Kconfig"

net/ieee80211/softmac/Kconfig

+config IEEE80211_SOFTMAC
+	tristate "Software MAC add-on to the IEEE 802.11 networking stack"
+	---help---
+	This option enables the hardware independent software MAC addon
+	for the IEEE 802.11 networking stack.
+
+config IEEE80211_SOFTMAC_DEBUG
+	bool "Enable full debugging output"
+	depends on IEEE80211_SOFTMAC

net/ieee80211/softmac/Makefile

+obj-$(CONFIG_IEEE80211_SOFTMAC) := ieee80211softmac.o
+ieee80211softmac-objs := \
+			ieee80211softmac_io.o \
+			ieee80211softmac_auth.o \
+			ieee80211softmac_module.o \
+			ieee80211softmac_scan.o \
+			ieee80211softmac_wx.o \
+			ieee80211softmac_assoc.o \
+			ieee80211softmac_event.o

net/ieee80211/softmac/ieee80211softmac_assoc.c

+#include "ieee80211softmac_priv.h"
+
+/*
+ * Overview
+ *
+ * Before you can associate, you have to authenticate.
+ * 
+ */
+
+/* Sends out an association request to the desired AP */
+static void
+ieee80211softmac_assoc(struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net)
+{
+	unsigned long flags;
+	function_enter();
+	/* Switch to correct channel for this network */
+	mac->set_channel(mac->dev, net->channel);
+	
+	/* Send association request */
+	ieee80211softmac_send_mgt_frame(mac, net, IEEE80211_STYPE_ASSOC_REQ, 0);
+	
+	dprintk(KERN_INFO PFX "sent association request!\n");
+
+	/* Change the state to associating */
+	spin_lock_irqsave(&mac->lock, flags);
+	mac->associnfo.associating = 1;
+	mac->associated = 0; /* just to make sure */
+	spin_unlock_irqrestore(&mac->lock, flags);
+
+	/* Set a timer for timeout */
+	/* FIXME: make timeout configurable */
+	queue_delayed_work(mac->workqueue, &mac->associnfo.timeout, 5 * HZ);
+}
+
+void
+ieee80211softmac_assoc_timeout(void *d)
+{
+	struct ieee80211softmac_device *mac = (struct ieee80211softmac_device *)d;
+	unsigned long flags;
+
+	function_enter();
+
+	spin_lock_irqsave(&mac->lock, flags);
+	/* we might race against ieee80211softmac_handle_assoc_response,
+	 * so make sure only one of us does something */
+	if (!mac->associnfo.associating) {
+		spin_unlock_irqrestore(&mac->lock, flags);
+		return;
+	}
+	mac->associnfo.associating = 0;
+	mac->associnfo.bssvalid = 0;
+	mac->associated = 0;
+	spin_unlock_irqrestore(&mac->lock, flags);
+
+	dprintk(KERN_INFO PFX "assoc request timed out!\n");
+	/* FIXME: we need to know the network here. that requires a bit of restructuring */
+	ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_TIMEOUT, NULL);
+}
+
+static void
+ieee80211softmac_reassoc(struct ieee80211softmac_device *mac)
+{
+	function_enter();
+}
+
+
+/* Sends out a disassociation request to the desired AP */
+static void
+ieee80211softmac_disassoc(struct ieee80211softmac_device *mac, u16 reason)
+{
+	unsigned long flags;
+	struct ieee80211softmac_network *found;
+	function_enter();
+
+	if (mac->associnfo.bssvalid && mac->associated) {
+		found = ieee80211softmac_get_network_by_bssid(mac, mac->associnfo.bssid);
+		if (found)
+			ieee80211softmac_send_mgt_frame(mac, found, IEEE80211_STYPE_DISASSOC, reason);
+	} else if (mac->associnfo.associating) {
+		cancel_delayed_work(&mac->associnfo.timeout);
+	}
+
+	/* Change our state */
+	spin_lock_irqsave(&mac->lock, flags);
+	/* Do NOT clear bssvalid as that will break ieee80211softmac_assoc_work! */
+	mac->associated = 0;
+	mac->associnfo.associating = 0;
+	spin_unlock_irqrestore(&mac->lock, flags);
+}
+
+static inline int
+we_support_all_basic_rates(struct ieee80211softmac_device *mac, u8 *from, u8 from_len)
+{
+	int idx, search, found;
+	u8 rate, search_rate;
+
+	for (idx = 0; idx < (from_len); idx++) {
+		rate = (from)[idx];
+		if (!(rate & IEEE80211_BASIC_RATE_MASK))
+			continue;
+		found = 0;
+		rate &= ~IEEE80211_BASIC_RATE_MASK;
+		for (search = 0; search < mac->ratesinfo.count; search++) {
+			search_rate = mac->ratesinfo.rates[search];
+			search_rate &= ~IEEE80211_BASIC_RATE_MASK;
+			if (rate == search_rate) {
+				found = 1;
+				break;
+			}
+		}
+		if (!found)
+			return 0;
+	}
+	return 1;
+}
+
+static int
+network_matches_request(struct ieee80211softmac_device *mac, struct ieee80211_network *net)
+{
+	/* we cannot associate to networks whose name we don't know */
+	if (ieee80211_is_empty_essid(net->ssid, net->ssid_len))
+		return 0;
+	/* do not associate to a network whose BSSBasicRateSet we cannot support */
+	if (!we_support_all_basic_rates(mac, net->rates, net->rates_len))
+		return 0;
+	/* do we really need to check the ex rates? */
+	if (!we_support_all_basic_rates(mac, net->rates_ex, net->rates_ex_len))
+		return 0;
+
+	/* if 'ANY' network requested, take any that doesn't have privacy enabled */
+	if (mac->associnfo.req_essid.len == 0 
+	    && !(net->capability & WLAN_CAPABILITY_PRIVACY))
+		return 1;
+	if (net->ssid_len != mac->associnfo.req_essid.len)
+		return 0;
+	if (!memcmp(net->ssid, mac->associnfo.req_essid.data, mac->associnfo.req_essid.len))
+		return 1;
+	return 0;
+}
+
+static void
+ieee80211softmac_assoc_notify(struct net_device *dev, void *context)
+{
+	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
+	ieee80211softmac_assoc_work((void*)mac);
+}
+
+/* This function is called to handle userspace requests (asynchronously) */
+void
+ieee80211softmac_assoc_work(void *d)
+{
+	struct ieee80211softmac_device *mac = (struct ieee80211softmac_device *)d;
+	struct ieee80211softmac_network *found = NULL;
+	struct ieee80211_network *net = NULL, *best = NULL;
+	unsigned long flags;
+	
+	function_enter();
+	
+	/* meh */
+	if (mac->associated)
+		ieee80211softmac_disassoc(mac, WLAN_REASON_DISASSOC_STA_HAS_LEFT);
+
+	/* try to find the requested network in our list, if we found one already */
+	if (mac->associnfo.bssvalid)
+		found = ieee80211softmac_get_network_by_bssid(mac, mac->associnfo.bssid);	
+	
+	/* Search the ieee80211 networks for this network if we didn't find it */
+	if (!found)
+	{
+		spin_lock_irqsave(&mac->ieee->lock, flags);
+		list_for_each_entry(net, &mac->ieee->network_list, list) {
+			/* we're supposed to find the network with
+			 * the best signal here, as we're asked to join
+			 * any network with a specific ESSID, and many
+			 * different ones could have that.
+			 *
+			 * I'll for now implement just finding one at all 
+			 *
+			 * We also should take into account the rateset
+			 * here to find the best BSSID to try.
+			 */
+			if (network_matches_request(mac, net)) {
+				if (!best) {
+					best = net;
+					continue;
+				}
+				/* we already had a matching network, so
+				 * compare their properties to get the
+				 * better of the two ... (see above)
+				 */
+				/* TODO */
+				/* for now, just */
+				break;
+			}
+		}
+		/* if we unlock here, we might get interrupted and the `best'
+		 * pointer could go stale */
+		if (best) {
+			found = ieee80211softmac_create_network(mac, best);
+			/* if found is still NULL, then we got -ENOMEM somewhere */
+			if (found)
+				ieee80211softmac_add_network(mac, found);
+		}
+		spin_unlock_irqrestore(&mac->ieee->lock, flags);
+	}
+
+	if (!found) {
+		if (mac->associnfo.scan_retry > 0) {
+			spin_lock_irqsave(&mac->lock, flags);
+			mac->associnfo.scan_retry--;
+			spin_unlock_irqrestore(&mac->lock, flags);
+		
+			/* We know of no such network. Let's scan. 
+			 * NB: this also happens if we had no memory to copy the network info...
+			 * Maybe we can hope to have more memory after scanning finishes ;)
+			 */
+			dprintk(KERN_INFO PFX "Associate: Network not known, trying to initiate scan: ");
+			ieee80211softmac_notify(mac->dev, IEEE80211SOFTMAC_EVENT_SCAN_FINISHED, ieee80211softmac_assoc_notify, NULL);
+			if (ieee80211softmac_start_scan(mac))
+				dprintk("failed.\n");
+			else
+				dprintk("ok.\n");
+			return;
+		}
+		else {
+			spin_lock_irqsave(&mac->lock, flags);
+			mac->associnfo.associating = 0;
+			mac->associated = 0;
+			spin_unlock_irqrestore(&mac->lock, flags);
+
+			dprintk(KERN_INFO PFX "Unable to find network after scan!\n");
+			ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_NET_NOT_FOUND, NULL);
+			return;
+		}
+	}
+	
+	mac->associnfo.bssvalid = 1;
+	memcpy(mac->associnfo.bssid, found->bssid, ETH_ALEN);
+	/* copy the ESSID for displaying it */
+	mac->associnfo.associate_essid.len = found->essid.len;
+	memcpy(mac->associnfo.associate_essid.data, found->essid.data, IW_ESSID_MAX_SIZE + 1);
+	
+	/* we found a network! authenticate (if necessary) and associate to it. */
+	if (!found->authenticated) {
+		/* This relies on the fact that _auth_req only queues the work,
+		 * otherwise adding the notification would be racy. */
+		if (!ieee80211softmac_auth_req(mac, found)) {
+			dprintk(KERN_INFO PFX "cannot associate without being authenticated, requested authentication\n");
+			ieee80211softmac_notify_internal(mac, IEEE80211SOFTMAC_EVENT_ANY, found, ieee80211softmac_assoc_notify, NULL, GFP_KERNEL);
+		} else {
+			printkl(KERN_WARNING PFX "Not authenticated, but requesting authentication failed. Giving up to associate\n");
+			ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED, found);
+		}
+		return;
+	}
+	/* finally! now we can start associating */
+	ieee80211softmac_assoc(mac, found);
+}
+
+/* call this to do whatever is necessary when we're associated */
+static void
+ieee80211softmac_associated(struct ieee80211softmac_device *mac,
+	struct ieee80211_assoc_response * resp,
+	struct ieee80211softmac_network *net)
+{
+	mac->associnfo.associating = 0;
+	mac->associated = 1;
+	if (mac->set_bssid_filter)
+		mac->set_bssid_filter(mac->dev, net->bssid);
+	memcpy(mac->ieee->bssid, net->bssid, ETH_ALEN);
+	mac->dev->flags |= IFF_RUNNING;
+	
+	mac->association_id = le16_to_cpup(&resp->aid);
+}
+
+/* received frame handling functions */
+int
+ieee80211softmac_handle_assoc_response(struct net_device * dev,
+				       struct ieee80211_assoc_response * resp,
+				       struct ieee80211_network * _ieee80211_network_do_not_use)
+{
+	/* NOTE: the network parameter has to be ignored by
+	 *       this code because it is the ieee80211's pointer
+	 *       to the struct, not ours (we made a copy)
+	 */
+	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
+	u16 status = le16_to_cpup(&resp->status);
+	struct ieee80211softmac_network *network = NULL;
+	unsigned long flags;
+	
+	spin_lock_irqsave(&mac->lock, flags);
+
+	if (!mac->associnfo.associating) {
+		/* we race against the timeout function, so make sure
+		 * only one of us can do work */
+		spin_unlock_irqrestore(&mac->lock, flags);
+		return 0;
+	}
+	network = ieee80211softmac_get_network_by_bssid_locked(mac, resp->header.addr3);
+
+	/* someone sending us things without us knowing him? Ignore. */
+	if (!network) {
+		dprintk(KERN_INFO PFX "Received unrequested assocation response from " MAC_FMT "\n", MAC_ARG(resp->header.addr3));
+		spin_unlock_irqrestore(&mac->lock, flags);
+		return 0;
+	}
+
+	/* now that we know it was for us, we can cancel the timeout */
+	cancel_delayed_work(&mac->associnfo.timeout);
+
+	switch (status) {
+		case 0:
+			dprintk(KERN_INFO PFX "associated!\n");
+			ieee80211softmac_associated(mac, resp, network);
+			ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATED, network);
+			break;
+		case WLAN_REASON_STA_REQ_ASSOC_WITHOUT_AUTH:
+			if (!network->auth_desynced_once) {
+				/* there seem to be a few rare cases where our view of
+				 * the world is obscured, or buggy APs that don't DEAUTH
+				 * us properly. So we handle that, but allow it only once.
+				 */
+				printkl(KERN_INFO PFX "We were not authenticated during association, retrying...\n");
+				network->authenticated = 0;
+				/* we don't want to do this more than once ... */
+				network->auth_desynced_once = 1;
+				queue_work(mac->workqueue, &mac->associnfo.work);
+				break;
+			}
+		default:
+			dprintk(KERN_INFO PFX "associating failed (reason: 0x%x)!\n", status);
+			mac->associnfo.associating = 0;
+			mac->associnfo.bssvalid = 0;
+			mac->associated = 0;
+			ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED, network);
+	}
+	
+	spin_unlock_irqrestore(&mac->lock, flags);
+	return 0;
+}
+
+int
+ieee80211softmac_handle_disassoc(struct net_device * dev,
+				 struct ieee80211_disassoc *disassoc)
+{
+	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
+	unsigned long flags;
+	dprintk(KERN_INFO PFX "got disassoc frame\n");
+	
+	spin_lock_irqsave(&mac->lock, flags);
+	mac->associnfo.bssvalid = 0;
+	mac->associated = 0;
+	spin_unlock_irqrestore(&mac->lock, flags);
+	
+	return 0;
+}

net/ieee80211/softmac/ieee80211softmac_auth.c

+#include "ieee80211softmac_priv.h"
+
+static void ieee80211softmac_auth_queue(void *data);
+
+/* Queues an auth request to the desired AP */
+int
+ieee80211softmac_auth_req(struct ieee80211softmac_device *mac, 
+	struct ieee80211softmac_network *net)
+{
+	struct ieee80211softmac_auth_queue_item *auth;
+	unsigned long flags;
+	
+	function_enter();
+	
+	if (net->authenticating)
+		return 0;
+
+	/* Add the network if it's not already added */
+	ieee80211softmac_add_network(mac, net);
+
+	dprintk(KERN_NOTICE PFX "Queueing Authentication Request to "MAC_FMT"\n", MAC_ARG(net->bssid));
+	/* Queue the auth request */
+	auth = (struct ieee80211softmac_auth_queue_item *)
+		kmalloc(sizeof(struct ieee80211softmac_auth_queue_item), GFP_KERNEL);
+	if(auth == NULL)
+		return -ENOMEM;
+
+	auth->net = net;
+	auth->mac = mac;
+	auth->retry = IEEE80211SOFTMAC_AUTH_RETRY_LIMIT;
+	auth->state = IEEE80211SOFTMAC_AUTH_OPEN_REQUEST;
+	INIT_WORK(&auth->work, &ieee80211softmac_auth_queue, (void *)auth);
+	
+	/* Lock (for list) */
+	spin_lock_irqsave(&mac->lock, flags);
+
+	/* add to list */
+	list_add_tail(&auth->list, &mac->auth_queue);
+	queue_work(mac->workqueue, &auth->work);
+	spin_unlock_irqrestore(&mac->lock, flags);
+	
+	return 0;
+}
+
+
+/* Sends an auth request to the desired AP and handles timeouts */
+static void
+ieee80211softmac_auth_queue(void *data)
+{
+	struct ieee80211softmac_device *mac;
+	struct ieee80211softmac_auth_queue_item *auth;
+	struct ieee80211softmac_network *net;
+	unsigned long flags;
+
+	function_enter();
+	
+	auth = (struct ieee80211softmac_auth_queue_item *)data;
+	net = auth->net;
+	mac = auth->mac;
+
+	if(auth->retry > 0) {
+		/* Switch to correct channel for this network */
+		mac->set_channel(mac->dev, net->channel);
+		
+		/* Lock and set flags */
+		spin_lock_irqsave(&mac->lock, flags);
+		net->authenticated = 0;
+		net->authenticating = 1;
+		/* add a timeout call so we eventually give up waiting for an auth reply */
+		queue_delayed_work(mac->workqueue, &auth->work, IEEE80211SOFTMAC_AUTH_TIMEOUT);
+		auth->retry--;
+		spin_unlock_irqrestore(&mac->lock, flags);
+		if (ieee80211softmac_send_mgt_frame(mac, auth->net, IEEE80211_STYPE_AUTH, auth->state))
+			dprintk(KERN_NOTICE PFX "Sending Authentication Request to "MAC_FMT" failed (this shouldn't happen, wait for the timeout).\n", MAC_ARG(net->bssid));
+		else
+			dprintk(KERN_NOTICE PFX "Sent Authentication Request to "MAC_FMT".\n", MAC_ARG(net->bssid));
+		return;
+	}
+
+	printkl(KERN_WARNING PFX "Authentication timed out with "MAC_FMT"\n", MAC_ARG(net->bssid));
+	/* Remove this item from the queue */
+	spin_lock_irqsave(&mac->lock, flags);
+	ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_AUTH_TIMEOUT, net);
+	cancel_delayed_work(&auth->work); /* just to make sure... */
+	list_del(&auth->list);
+	spin_unlock_irqrestore(&mac->lock, flags);
+	/* Free it */
+	kfree(auth);
+}
+
+/* Handle the auth response from the AP
+ * This should be registered with ieee80211 as handle_auth 
+ */
+int 
+ieee80211softmac_auth_resp(struct net_device *dev, struct ieee80211_auth *auth)
+{	
+
+	struct list_head *list_ptr;
+	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
+	struct ieee80211softmac_auth_queue_item *aq = NULL;
+	struct ieee80211softmac_network *net = NULL;
+	unsigned long flags;
+	u8 * data;
+	
+	function_enter();
+	
+	/* Find correct auth queue item */
+	spin_lock_irqsave(&mac->lock, flags);
+	list_for_each(list_ptr, &mac->auth_queue) {
+		aq = list_entry(list_ptr, struct ieee80211softmac_auth_queue_item, list);
+		net = aq->net;
+		if (!memcmp(net->bssid, auth->header.addr2, ETH_ALEN))
+			break;
+		else
+			aq = NULL;
+	}
+	spin_unlock_irqrestore(&mac->lock, flags);
+	
+	/* Make sure that we've got an auth queue item for this request */
+	if(aq == NULL)
+	{
+		printkl(KERN_DEBUG PFX "Authentication response received from "MAC_FMT" but no queue item exists.\n", MAC_ARG(auth->header.addr2));
+		/* Error #? */
+		return -1;
+	}			
+	
+	/* Check for out of order authentication */
+	if(!net->authenticating)
+	{
+		printkl(KERN_DEBUG PFX "Authentication response received from "MAC_FMT" but did not request authentication.\n",MAC_ARG(auth->header.addr2));
+		return -1;
+	}
+
+	/* Parse the auth packet */
+	switch(auth->algorithm) {
+	case WLAN_AUTH_OPEN:
+		/* Check the status code of the response */
+
+		switch(auth->status) {
+		case WLAN_STATUS_SUCCESS:
+			/* Update the status to Authenticated */
+			spin_lock_irqsave(&mac->lock, flags);
+		        net->authenticating = 0;
+			net->authenticated = 1;
+			spin_unlock_irqrestore(&mac->lock, flags);
+			
+			/* Send event */
+			printkl(KERN_NOTICE PFX "Open Authentication completed with "MAC_FMT"\n", MAC_ARG(net->bssid));
+			ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_AUTHENTICATED, net);
+			break;
+		default:
+			/* Lock and reset flags */
+			spin_lock_irqsave(&mac->lock, flags);
+			net->authenticated = 0;
+			net->authenticating = 0;
+			spin_unlock_irqrestore(&mac->lock, flags);
+			
+			printkl(KERN_NOTICE PFX "Open Authentication with "MAC_FMT" failed, error code: %i\n", 
+				MAC_ARG(net->bssid), le16_to_cpup(&auth->status));
+			/* Count the error? */
+			break;
+		}
+		goto free_aq;
+		break;
+	case WLAN_AUTH_SHARED_KEY:
+		/* Figure out where we are in the process */
+		switch(auth->transaction) {
+		case IEEE80211SOFTMAC_AUTH_SHARED_CHALLENGE:
+			/* Check to make sure we have a challenge IE */
+			data = (u8 *)auth->info_element;
+			if(*data++ != MFIE_TYPE_CHALLENGE){
+				printkl(KERN_NOTICE PFX "Shared Key Authentication failed due to a missing challenge.\n");
+				break;	
+			}
+			/* Save the challenge */
+			spin_lock_irqsave(&mac->lock, flags);
+			net->challenge_len = *data++; 	
+			if(net->challenge_len > WLAN_AUTH_CHALLENGE_LEN)
+				net->challenge_len = WLAN_AUTH_CHALLENGE_LEN;
+			if(net->challenge != NULL)
+				kfree(net->challenge);
+			net->challenge = kmalloc(net->challenge_len, GFP_ATOMIC);
+			memcpy(net->challenge, data, net->challenge_len);
+			aq->state = IEEE80211SOFTMAC_AUTH_SHARED_RESPONSE; 
+			spin_unlock_irqrestore(&mac->lock, flags);
+
+			/* Switch to correct channel for this network */
+			mac->set_channel(mac->dev, net->channel);
+			
+			/* Send our response (How to encrypt?) */
+			ieee80211softmac_send_mgt_frame(mac, aq->net, IEEE80211_STYPE_AUTH, aq->state);
+			break;
+		case IEEE80211SOFTMAC_AUTH_SHARED_PASS:
+			/* Check the status code of the response */
+			switch(auth->status) {
+			case WLAN_STATUS_SUCCESS:
+				/* Update the status to Authenticated */	
+				spin_lock_irqsave(&mac->lock, flags);
+				net->authenticating = 0;
+				net->authenticated = 1;
+				spin_unlock_irqrestore(&mac->lock, flags);
+				printkl(KERN_NOTICE PFX "Shared Key Authentication completed with "MAC_FMT"\n", 
+					MAC_ARG(net->bssid));
+				break;
+			default:
+				printkl(KERN_NOTICE PFX "Shared Key Authentication with "MAC_FMT" failed, error code: %i\n", 
+					MAC_ARG(net->bssid), le16_to_cpup(&auth->status));
+				/* Lock and reset flags */
+				spin_lock_irqsave(&mac->lock, flags);
+ 				net->authenticating = 0;
+ 				net->authenticated = 0;
+				spin_unlock_irqrestore(&mac->lock, flags);
+				/* Count the error? */
+				break;
+			}
+			goto free_aq;
+			break;
+		default:
+			printkl(KERN_WARNING PFX "Unhandled Authentication Step: %i\n", auth->transaction);
+			break;
+		}
+		goto free_aq;
+		break;
+	default:
+		/* ERROR */	
+		goto free_aq;
+		break;
+	}
+	return 0;
+free_aq:
+	/* Cancel the timeout */
+	spin_lock_irqsave(&mac->lock, flags);
+	cancel_delayed_work(&aq->work);
+	/* Remove this item from the queue */
+	list_del(&aq->list);
+	spin_unlock_irqrestore(&mac->lock, flags);
+
+	/* Free it */
+	kfree(aq);
+	return 0;
+}
+
+/*
+ * Handle deauthorization
+ */
+void
+ieee80211softmac_deauth_from_net(struct ieee80211softmac_device *mac,
+	struct ieee80211softmac_network *net)
+{
+	struct ieee80211softmac_auth_queue_item *aq = NULL;
+	struct list_head *list_ptr;
+	unsigned long flags;
+
+	function_enter();
+	
+	/* Lock and reset status flags */
+	spin_lock_irqsave(&mac->lock, flags);
+	net->authenticating = 0;
+	net->authenticated = 0;
+	
+	/* Find correct auth queue item, if it exists */
+	list_for_each(list_ptr, &mac->auth_queue) {
+		aq = list_entry(list_ptr, struct ieee80211softmac_auth_queue_item, list);
+		if (!memcmp(net->bssid, aq->net->bssid, ETH_ALEN))
+			break;
+		else
+			aq = NULL;
+	}
+	
+	/* Cancel pending work */
+	if(aq != NULL)
+		/* Not entirely safe?  What about running work? */
+		cancel_delayed_work(&aq->work);
+
+	/* Free our network ref */
+	ieee80211softmac_del_network_locked(mac, net);
+	if(net->challenge != NULL)
+		kfree(net->challenge);
+	kfree(net);
+	
+	/* let's try to re-associate */
+	queue_work(mac->workqueue, &mac->associnfo.work);
+	spin_unlock_irqrestore(&mac->lock, flags);
+}
+
+/* 
+ * Sends a deauth request to the desired AP
+ */
+int 
+ieee80211softmac_deauth_req(struct ieee80211softmac_device *mac, 
+	struct ieee80211softmac_network *net, int reason)
+{
+	int ret;
+	
+	function_enter();
+
+	/* Make sure the network is authenticated */
+	if (!net->authenticated)
+	{
+		printkl(KERN_DEBUG PFX "Can't send deauthentication packet, network is not authenticated.\n");
+		/* Error okay? */
+		return -EPERM;
+	}
+	
+	/* Send the de-auth packet */
+	if((ret = ieee80211softmac_send_mgt_frame(mac, net, IEEE80211_STYPE_DEAUTH, reason)))
+		return ret;
+	
+	ieee80211softmac_deauth_from_net(mac, net);
+	return 0;
+}
+ 
+/*
+ * This should be registered with ieee80211 as handle_deauth
+ */
+int 
+ieee80211softmac_deauth_resp(struct net_device *dev, struct ieee80211_auth *auth)
+{
+	
+	struct ieee80211softmac_network *net = NULL;
+	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
+	
+	function_enter();
+	
+	if (!auth) {
+		dprintk("deauth without deauth packet. eek!\n");
+		return 0;
+	}
+
+	net = ieee80211softmac_get_network_by_bssid(mac, auth->header.addr2);
+	
+	if (net == NULL) {
+		printkl(KERN_DEBUG PFX "Recieved deauthentication packet from "MAC_FMT", but that network is unknown.\n",
+			MAC_ARG(auth->header.addr2));
+		return 0;
+	}
+
+	/* Make sure the network is authenticated */
+	if(!net->authenticated)
+	{
+		printkl(KERN_DEBUG PFX "Can't perform deauthentication, network is not authenticated.\n");
+		/* Error okay? */
+		return -EPERM;
+	}
+
+	ieee80211softmac_deauth_from_net(mac, net);
+	return 0;
+}

net/ieee80211/softmac/ieee80211softmac_event.c

+#include "ieee80211softmac_priv.h"
+
+/*
+ * Event system
+ * Also see comments in public header file
+ *
+ * Each event has associated to it
+ *  - an event type (see constants in public header)
+ *  - an event context (see below)
+ *  - the function to be called
+ *  - a context (extra parameter to call the function with)
+ *  - and the softmac struct
+ *
+ * The event context is private and can only be used from
+ * within this module. Its meaning varies with the event
+ * type:
+ *  SCAN_FINISHED:	no special meaning
+ *  ASSOCIATED,
+ *  ASSOCIATE_FAILED,
+ *  ASSOCIATE_TIMEOUT,
+ *  AUTHENTICATED,
+ *  AUTH_FAILED,
+ *  AUTH_TIMEOUT:	a pointer to the network struct
+ * ...
+ * Code within this module can use the event context to be only
+ * called when the event is true for that specific context
+ * as per above table.
+ * If the event context is NULL, then the notification is always called,
+ * regardless of the event context. The event context is not passed to
+ * the callback, it is assumed that the context suffices.
+ *
+ * You can also use the event context only by setting the event type
+ * to -1 (private use only), in which case you'll be notified
+ * whenever the event context matches.
+ */
+
+static char *event_descriptions[IEEE80211SOFTMAC_EVENT_LAST+1] = {
+	"scan finished",
+	"associated",
+	"associating failed",
+	"associating timed out",
+	"authenticated",
+	"authenticating failed",
+	"authenticating timed out",
+	"associating failed because no suitable network was found",
+};
+
+
+static void
+ieee80211softmac_notify_callback(void *d)
+{
+	struct ieee80211softmac_event event = *(struct ieee80211softmac_event*) d;
+	kfree(d);
+	
+	event.fun(event.mac->dev, event.context);
+}
+
+int
+ieee80211softmac_notify_internal(struct ieee80211softmac_device *mac,
+	int event, void *event_context, notify_function_ptr fun, void *context, gfp_t gfp_mask)
+{
+	struct ieee80211softmac_event *eventptr;
+	unsigned long flags;
+
+	if (event < -1 || event > IEEE80211SOFTMAC_EVENT_LAST)
+		return -ENOSYS;
+	
+	if (!fun)
+		return -EINVAL;
+	
+	eventptr = kmalloc(sizeof(struct ieee80211softmac_event), gfp_mask);
+	if (!eventptr)
+		return -ENOMEM;
+	
+	eventptr->event_type = event;
+	INIT_WORK(&eventptr->work, ieee80211softmac_notify_callback, eventptr);
+	eventptr->fun = fun;
+	eventptr->context = context;
+	eventptr->mac = mac;
+	eventptr->event_context = event_context;
+
+	spin_lock_irqsave(&mac->lock, flags);
+	list_add(&eventptr->list, &mac->events);
+	spin_unlock_irqrestore(&mac->lock, flags);
+
+	return 0;
+}
+
+int
+ieee80211softmac_notify_gfp(struct net_device *dev,
+	int event, notify_function_ptr fun, void *context, gfp_t gfp_mask)
+{
+	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
+
+	if (event < 0 || event > IEEE80211SOFTMAC_EVENT_LAST)
+		return -ENOSYS;
+	
+	return ieee80211softmac_notify_internal(mac, event, NULL, fun, context, gfp_mask);
+}
+EXPORT_SYMBOL_GPL(ieee80211softmac_notify_gfp);
+
+/* private -- calling all callbacks that were specified */
+void
+ieee80211softmac_call_events_locked(struct ieee80211softmac_device *mac, int event, void *event_ctx)
+{
+	struct ieee80211softmac_event *eventptr, *tmp;
+	union iwreq_data wrqu;
+	char *msg;
+	
+	if (event >= 0) {
+		msg = event_descriptions[event];
+		wrqu.data.length = strlen(msg);
+		wireless_send_event(mac->dev, IWEVCUSTOM, &wrqu, msg);
+	}
+
+	if (!list_empty(&mac->events))
+		list_for_each_entry_safe(eventptr, tmp, &mac->events, list) {
+			if ((eventptr->event_type == event || eventptr->event_type == -1)
+				&& (eventptr->event_context == NULL || eventptr->event_context == event_ctx)) {
+				list_del(&eventptr->list);
+				queue_work(mac->workqueue, &eventptr->work);
+			}
+		}
+}
+
+void
+ieee80211softmac_call_events(struct ieee80211softmac_device *mac, int event, void *event_ctx)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&mac->lock, flags);
+	ieee80211softmac_call_events_locked(mac, event, event_ctx);
+
+	spin_unlock_irqrestore(&mac->lock, flags);
+}

net/ieee80211/softmac/ieee80211softmac_io.c

+/* 
+ * Some parts based on code from net80211
+ * Copyright (c) 2001 Atsushi Onoe
+ * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ */
+
+#include "ieee80211softmac_priv.h"
+
+/* Helper functions for inserting data into the frames */
+
+/* 
+ * Adds an ESSID element to the frame
+ *
+ */
+static u8 *
+ieee80211softmac_add_essid(u8 *dst, struct ieee80211softmac_essid *essid)
+{
+	if (essid) {
+		*dst++ = MFIE_TYPE_SSID;
+		*dst++ = essid->len;
+		memcpy(dst, essid->data, essid->len);
+		return dst+essid->len;
+	} else {
+		*dst++ = MFIE_TYPE_SSID;
+		*dst++ = 0;
+		return dst;
+	}
+}     
+
+/* Adds Supported Rates and if required Extended Rates Information Element
+ * to the frame, ASSUMES WE HAVE A SORTED LIST OF RATES */
+static u8 *
+ieee80211softmac_frame_add_rates(u8 *dst, const struct ieee80211softmac_ratesinfo *r)
+{
+	int cck_len, ofdm_len;
+	*dst++ = MFIE_TYPE_RATES;
+
+	for(cck_len=0; ieee80211_is_cck_rate(r->rates[cck_len]) && (cck_len < r->count);cck_len++);
+
+	if(cck_len > IEEE80211SOFTMAC_MAX_RATES_LEN)
+		cck_len = IEEE80211SOFTMAC_MAX_RATES_LEN;
+	*dst++ = cck_len;
+	memcpy(dst, r->rates, cck_len);
+	dst += cck_len;
+
+	if(cck_len < r->count){
+		for (ofdm_len=0; ieee80211_is_ofdm_rate(r->rates[ofdm_len + cck_len]) && (ofdm_len + cck_len < r->count); ofdm_len++);
+		if (ofdm_len > 0) {
+			if (ofdm_len > IEEE80211SOFTMAC_MAX_EX_RATES_LEN)
+				ofdm_len = IEEE80211SOFTMAC_MAX_EX_RATES_LEN;
+			*dst++ = MFIE_TYPE_RATES_EX;
+			*dst++ = ofdm_len;
+			memcpy(dst, r->rates + cck_len, ofdm_len);
+			dst += ofdm_len;
+		}
+	}	
+	return dst;
+}
+
+/* Allocate a management frame */
+static u8 * 
+ieee80211softmac_alloc_mgt(u32 size)
+{
+	u8 * data;
+	
+	/* Add the header and FCS to the size */
+	size = size + IEEE80211_3ADDR_LEN;	
+	if(size > IEEE80211_DATA_LEN)
+		return NULL;
+	/* Allocate the frame */
+	data = kmalloc(size, GFP_ATOMIC);
+	memset(data, 0, size);
+	return data;
+}
+
+/*
+ * Add a 2 Address Header
+ */
+static void 
+ieee80211softmac_hdr_2addr(struct ieee80211softmac_device *mac,
+	struct ieee80211_hdr_2addr *header, u32 type, u8 *dest)
+{
+	/* Fill in the frame control flags */
+	header->frame_ctl = cpu_to_le16(type);
+	/* Control packets always have WEP turned off */	
+	if(type > IEEE80211_STYPE_CFENDACK && type < IEEE80211_STYPE_PSPOLL)
+		header->frame_ctl |= mac->ieee->sec.level ? cpu_to_le16(IEEE80211_FCTL_PROTECTED) : 0;
+
+	/* Fill in the duration */
+	header->duration_id = 0;
+	/* FIXME: How do I find this?
+	 * calculate. But most drivers just fill in 0 (except if it's a station id of course) */
+
+	/* Fill in the Destination Address */
+	if(dest == NULL)
+		memset(header->addr1, 0xFF, ETH_ALEN);
+	else
+		memcpy(header->addr1, dest, ETH_ALEN);
+	/* Fill in the Source Address */
+	memcpy(header->addr2, mac->ieee->dev->dev_addr, ETH_ALEN);
+
+}
+
+
+/* Add a 3 Address Header */
+static void 
+ieee80211softmac_hdr_3addr(struct ieee80211softmac_device *mac,
+	struct ieee80211_hdr_3addr *header, u32 type, u8 *dest, u8 *bssid)
+{
+	/* This is common with 2addr, so use that instead */
+	ieee80211softmac_hdr_2addr(mac, (struct ieee80211_hdr_2addr *)header, type, dest);	
+	
+	/* Fill in the BSS ID */
+	if(bssid == NULL)
+		memset(header->addr3, 0xFF, ETH_ALEN);
+	else
+		memcpy(header->addr3, bssid, ETH_ALEN);
+
+	/* Fill in the sequence # */
+	/* FIXME: I need to add this to the softmac struct
+	 * shouldn't the sequence number be in ieee80211? */
+}
+
+
+/*****************************************************************************
+ * Create Management packets
+ *****************************************************************************/ 
+
+/* Creates an association request packet */
+u32
+ieee80211softmac_assoc_req(struct ieee80211_assoc_request **pkt, 
+	struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net)
+{
+	u8 *data;
+	(*pkt) = (struct ieee80211_assoc_request *)ieee80211softmac_alloc_mgt(
+		2 +		/* Capability Info */
+		2 +	 	/* Listen Interval */
+		/* SSID IE */
+		1 + 1 + IW_ESSID_MAX_SIZE +
+		/* Rates IE */
+		1 + 1 + IEEE80211SOFTMAC_MAX_RATES_LEN +
+		/* Extended Rates IE */
+		1 + 1 + IEEE80211SOFTMAC_MAX_EX_RATES_LEN +
+		/* WPA IE if present */
+		mac->wpa.IElen
+		/* Other IE's?  Optional?
+		 * Yeah, probably need an extra IE parameter -- lots of vendors like to
+		 * fill in their own IEs */
+	);
+	if (unlikely((*pkt) == NULL))
+		return 0;
+	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_ASSOC_REQ, net->bssid, net->bssid);
+
+	/* Fill in capability Info */
+	(*pkt)->capability = (mac->ieee->iw_mode == IW_MODE_MASTER) || (mac->ieee->iw_mode == IW_MODE_INFRA) ?
+		cpu_to_le16(WLAN_CAPABILITY_ESS) :
+		cpu_to_le16(WLAN_CAPABILITY_IBSS);
+	/* Need to add this
+	(*pkt)->capability |= mac->ieee->short_slot ? 
+			cpu_to_le16(WLAN_CAPABILITY_SHORT_SLOT_TIME) : 0;
+	 */
+	(*pkt)->capability |= mac->ieee->sec.level ? cpu_to_le16(WLAN_CAPABILITY_PRIVACY) : 0;
+	/* Fill in Listen Interval (?) */
+	(*pkt)->listen_interval = cpu_to_le16(10);
+	
+	data = (u8 *)(*pkt)->info_element;
+	/* Add SSID */
+	data = ieee80211softmac_add_essid(data, &net->essid);
+	/* Add Rates */
+	data = ieee80211softmac_frame_add_rates(data, &mac->ratesinfo);
+	/* Add WPA IE */
+	if (mac->wpa.IElen && mac->wpa.IE) {
+		memcpy(data, mac->wpa.IE, mac->wpa.IElen);
+		data += mac->wpa.IElen;
+	}
+	/* Return the number of used bytes */
+	return (data - (u8*)(*pkt));
+}
+
+/* Create a reassociation request packet */
+u32
+ieee80211softmac_reassoc_req(struct ieee80211_reassoc_request **pkt, 
+	struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net)
+{
+	u8 *data;
+	(*pkt) = (struct ieee80211_reassoc_request *)ieee80211softmac_alloc_mgt(
+		2 +		/* Capability Info */
+		2 +	 	/* Listen Interval */
+		ETH_ALEN +	/* AP MAC */
+		/* SSID IE */
+		1 + 1 + IW_ESSID_MAX_SIZE +
+		/* Rates IE */
+		1 + 1 + IEEE80211SOFTMAC_MAX_RATES_LEN +
+		/* Extended Rates IE */
+		1 + 1 + IEEE80211SOFTMAC_MAX_EX_RATES_LEN 
+		/* Other IE's? */
+	);				
+	if (unlikely((*pkt) == NULL))
+		return 0;
+	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_REASSOC_REQ, net->bssid, net->bssid);
+
+	/* Fill in capability Info */
+	(*pkt)->capability = mac->ieee->iw_mode == IW_MODE_MASTER ? 
+				cpu_to_le16(WLAN_CAPABILITY_ESS) :
+				cpu_to_le16(WLAN_CAPABILITY_IBSS);
+	/*
+	(*pkt)->capability |= mac->ieee->short_slot ? 
+			cpu_to_le16(WLAN_CAPABILITY_SHORT_SLOT_TIME) : 0;
+	 */
+	(*pkt)->capability |= mac->ieee->sec.level ?
+			cpu_to_le16(WLAN_CAPABILITY_PRIVACY) : 0;
+		
+	/* Fill in Listen Interval (?) */
+	(*pkt)->listen_interval = cpu_to_le16(10);
+	/* Fill in the current AP MAC */
+	memcpy((*pkt)->current_ap, mac->ieee->bssid, ETH_ALEN);
+	
+	data = (u8 *)(*pkt)->info_element;
+	/* Add SSID */
+	data = ieee80211softmac_add_essid(data, &net->essid); 
+	/* Add Rates */
+	data = ieee80211softmac_frame_add_rates(data, &mac->ratesinfo);
+	/* Return packet size */
+	return (data - (u8 *)(*pkt));
+}
+
+/* Create an authentication packet */
+u32
+ieee80211softmac_auth(struct ieee80211_auth **pkt, 
+	struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net,
+	u16 transaction, u16 status)
+{
+	u8 *data;
+	/* Allocate Packet */
+	(*pkt) = (struct ieee80211_auth *)ieee80211softmac_alloc_mgt(
+		2 +		/* Auth Algorithm */
+		2 +		/* Auth Transaction Seq */
+		2 +		/* Status Code */
+		 /* Challenge Text IE */
+		mac->ieee->open_wep ? 0 : 
+		1 + 1 + WLAN_AUTH_CHALLENGE_LEN
+	);	
+	if (unlikely((*pkt) == NULL))
+		return 0;
+	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_AUTH, net->bssid, net->bssid);
+		
+	/* Algorithm */
+	(*pkt)->algorithm = mac->ieee->open_wep ? 
+		cpu_to_le16(WLAN_AUTH_OPEN) :
+		cpu_to_le16(WLAN_AUTH_SHARED_KEY);
+	/* Transaction */
+	(*pkt)->transaction = cpu_to_le16(transaction);
+	/* Status */
+	(*pkt)->status = cpu_to_le16(status);
+	
+	data = (u8 *)(*pkt)->info_element;
+	/* Challenge Text */
+	if(!mac->ieee->open_wep){
+		*data = MFIE_TYPE_CHALLENGE;
+		data++;
+		
+		/* Copy the challenge in */
+		// *data = challenge length
+		// data += sizeof(u16);
+		// memcpy(data, challenge, challenge length);
+		// data += challenge length;
+		
+		/* Add the full size to the packet length */
+	}
+
+	/* Return the packet size */
+	return (data - (u8 *)(*pkt));
+}
+
+/* Create a disassocation or deauthentication packet */
+u32
+ieee80211softmac_disassoc_deauth(struct ieee80211_disassoc **pkt,
+	struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net,
+	u16 type, u16 reason)
+{
+	/* Allocate Packet */
+	(*pkt) = (struct ieee80211_disassoc *)ieee80211softmac_alloc_mgt(2);
+	if (unlikely(pkt == NULL))
+		return 0;
+	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), type, net->bssid, net->bssid);
+	/* Reason */
+	(*pkt)->reason = cpu_to_le16(reason);
+	/* Return the packet size */
+	return (2 + IEEE80211_3ADDR_LEN);
+}
+
+/* Create a probe request packet */
+u32
+ieee80211softmac_probe_req(struct ieee80211_probe_request **pkt,
+	struct ieee80211softmac_device *mac, struct ieee80211softmac_essid *essid)
+{
+	u8 *data;	
+	/* Allocate Packet */
+	(*pkt) = (struct ieee80211_probe_request *)ieee80211softmac_alloc_mgt(
+		/* SSID of requested network */
+		1 + 1 + IW_ESSID_MAX_SIZE +
+		/* Rates IE */
+		1 + 1 + IEEE80211SOFTMAC_MAX_RATES_LEN +
+		/* Extended Rates IE */
+		1 + 1 + IEEE80211SOFTMAC_MAX_EX_RATES_LEN 
+	);
+	if (unlikely((*pkt) == NULL))
+		return 0;
+	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_PROBE_REQ, NULL, NULL);
+		
+	data = (u8 *)(*pkt)->info_element;
+	/* Add ESSID (can be NULL) */
+	data = ieee80211softmac_add_essid(data, essid);
+	/* Add Rates */
+	data = ieee80211softmac_frame_add_rates(data, &mac->ratesinfo);
+	/* Return packet size */
+	return (data - (u8 *)(*pkt));
+}
+
+/* Create a probe response packet */
+/* FIXME: Not complete */
+u32
+ieee80211softmac_probe_resp(struct ieee80211_probe_response **pkt,
+	struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net)
+{
+	u8 *data;
+	/* Allocate Packet */
+	(*pkt) = (struct ieee80211_probe_response *)ieee80211softmac_alloc_mgt(
+		8 +		/* Timestamp */
+		2 +		/* Beacon Interval */
+		2 +		/* Capability Info */
+				/* SSID IE */
+		1 + 1 + IW_ESSID_MAX_SIZE +
+		7 + 		/* FH Parameter Set */
+		2 +		/* DS Parameter Set */
+		8 +		/* CF Parameter Set */
+		4 		/* IBSS Parameter Set */
+	);	
+	if (unlikely((*pkt) == NULL))
+		return 0;
+	ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_PROBE_RESP, net->bssid, net->bssid);
+	data = (u8 *)(*pkt)->info_element;
+
+	/* Return the packet size */
+	return (data - (u8 *)(*pkt));
+}
+
+
+/* Sends a manangement packet
+ * FIXME: document the use of the arg parameter
+ * for _AUTH: (transaction #) | (status << 16)
+ */
+int
+ieee80211softmac_send_mgt_frame(struct ieee80211softmac_device *mac,
+	void *ptrarg, u32 type, u32 arg)
+{
+	void *pkt = NULL;
+	u32 pkt_size = 0;
+
+	switch(type) {
+	case IEEE80211_STYPE_ASSOC_REQ:
+		pkt_size = ieee80211softmac_assoc_req((struct ieee80211_assoc_request **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg);
+		break;
+	case IEEE80211_STYPE_REASSOC_REQ:
+		pkt_size = ieee80211softmac_reassoc_req((struct ieee80211_reassoc_request **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg);
+		break;
+	case IEEE80211_STYPE_AUTH:
+		pkt_size = ieee80211softmac_auth((struct ieee80211_auth **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg, (u16)(arg & 0xFFFF), (u16) (arg >> 16));
+		break;
+	case IEEE80211_STYPE_DISASSOC:
+	case IEEE80211_STYPE_DEAUTH:
+		pkt_size = ieee80211softmac_disassoc_deauth((struct ieee80211_disassoc **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg, type, (u16)(arg & 0xFFFF));
+		break;
+	case IEEE80211_STYPE_PROBE_REQ:
+		pkt_size = ieee80211softmac_probe_req((struct ieee80211_probe_request **)(&pkt), mac, (struct ieee80211softmac_essid *)ptrarg);
+		break;
+	case IEEE80211_STYPE_PROBE_RESP:
+		pkt_size = ieee80211softmac_probe_resp((struct ieee80211_probe_response **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg);
+		break;
+	default:
+                printkl(KERN_DEBUG PFX "Unsupported Management Frame type: %i\n", type);
+                return -EINVAL;
+	};
+
+	if(pkt_size == 0 || pkt == NULL) {
+		printkl(KERN_DEBUG PFX "Error, packet is nonexistant or 0 length\n");
+		return -ENOMEM;
+	}
+	
+	/* Send the packet to the ieee80211 layer for tx */
+	/* we defined softmac->mgmt_xmit for this. Should we keep it
+	 * as it is (that means we'd need to wrap this into a txb),
+	 * modify the prototype (so it matches this function),
+	 * or get rid of it alltogether?
+	 * Does this work for you now?
+	 */
+	ieee80211_tx_frame(mac->ieee, (struct ieee80211_hdr *)pkt, pkt_size);
+
+	kfree(pkt);
+	return 0;
+}
+
+
+/* Create an rts/cts frame */
+u32
+ieee80211softmac_rts_cts(struct ieee80211_hdr_2addr **pkt,
+	struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net, 
+	u32 type)
+{
+	/* Allocate Packet */
+	(*pkt) = kmalloc(IEEE80211_2ADDR_LEN, GFP_ATOMIC);	
+	memset(*pkt, 0, IEEE80211_2ADDR_LEN);
+	if((*pkt) == NULL)
+		return 0;
+	ieee80211softmac_hdr_2addr(mac, (*pkt), type, net->bssid);
+	return IEEE80211_2ADDR_LEN;
+}
+
+
+/* Sends a control packet */
+static int
+ieee80211softmac_send_ctl_frame(struct ieee80211softmac_device *mac,
+	struct ieee80211softmac_network *net, u32 type, u32 arg)
+{
+	void *pkt = NULL;
+	u32 pkt_size = 0;
+	
+	switch(type) {
+	case IEEE80211_STYPE_RTS:
+	case IEEE80211_STYPE_CTS:
+		pkt_size = ieee80211softmac_rts_cts((struct ieee80211_hdr_2addr **)(&pkt), mac, net, type);
+		break;
+	default:
+		printkl(KERN_DEBUG PFX "Unsupported Control Frame type: %i\n", type);
+		return -EINVAL;
+	}
+
+	if(pkt_size == 0)
+		return -ENOMEM;
+	
+	/* Send the packet to the ieee80211 layer for tx */
+	ieee80211_tx_frame(mac->ieee, (struct ieee80211_hdr *) pkt, pkt_size);
+
+	kfree(pkt);
+	return 0;
+}

net/ieee80211/softmac/ieee80211softmac_module.c

+#include "ieee80211softmac_priv.h"
+#include <linux/sort.h>
+
+struct net_device *alloc_ieee80211softmac(int sizeof_priv)
+{
+	struct ieee80211softmac_device *softmac;
+	struct net_device *dev;
+	
+	dev = alloc_ieee80211(sizeof(struct ieee80211softmac_device) + sizeof_priv);
+	softmac = ieee80211_priv(dev);
+	softmac->dev = dev;
+	softmac->ieee = netdev_priv(dev);
+	spin_lock_init(&softmac->lock);
+	
+	softmac->ieee->handle_auth = ieee80211softmac_auth_resp;
+	softmac->ieee->handle_deauth = ieee80211softmac_deauth_resp;
+	softmac->ieee->handle_assoc_response = ieee80211softmac_handle_assoc_response;
+	softmac->ieee->handle_disassoc = ieee80211softmac_handle_disassoc;
+	softmac->scaninfo = NULL;
+
+	/* TODO: initialise all the other callbacks in the ieee struct
+	 *	 (once they're written)
+	 */
+
+	softmac->workqueue = create_workqueue("80211softmac");
+	if (!softmac->workqueue)
+		goto err_free_ieee80211;
+
+	INIT_LIST_HEAD(&softmac->auth_queue);
+	INIT_LIST_HEAD(&softmac->network_list);
+	INIT_LIST_HEAD(&softmac->events);
+
+	INIT_WORK(&softmac->associnfo.work, ieee80211softmac_assoc_work, softmac);
+	INIT_WORK(&softmac->associnfo.timeout, ieee80211softmac_assoc_timeout, softmac);
+	softmac->start_scan = ieee80211softmac_start_scan_implementation;
+	softmac->wait_for_scan = ieee80211softmac_wait_for_scan_implementation;
+	softmac->stop_scan = ieee80211softmac_stop_scan_implementation;
+
+	//TODO: The mcast rate has to be assigned dynamically somewhere (in scanning, association. Not sure...)
+	//      It has to be set to the highest rate all stations in the current network can handle.
+	softmac->txrates.mcast_rate = IEEE80211_CCK_RATE_1MB;
+	softmac->txrates.mcast_fallback = IEEE80211_CCK_RATE_1MB;
+	/* This is reassigned in ieee80211softmac_start to sane values. */
+	softmac->txrates.default_rate = IEEE80211_CCK_RATE_1MB;
+	softmac->txrates.default_fallback = IEEE80211_CCK_RATE_1MB;
+
+	/* should we also assign softmac->mgmt_xmit here so
+	 * that it is always valid? If so, we probably want
+	 * to define a new function for that which just
+	 * wraps ieee80211_tx_frame
+	 */
+	
+	/* until associated, we're not ready */
+	dev->flags &= ~IFF_RUNNING;
+
+	return dev;
+
+err_free_ieee80211:
+ 	free_ieee80211(dev);
+
+	return NULL;
+}
+
+/* Clears the pending work queue items, stops all scans, etc. */
+void 
+ieee80211softmac_clear_pending_work(struct ieee80211softmac_device *sm)
+{
+	unsigned long flags;
+	struct ieee80211softmac_event *eventptr, *eventtmp;
+	struct ieee80211softmac_auth_queue_item *authptr, *authtmp;
+	struct ieee80211softmac_network *netptr, *nettmp;
+	
+	ieee80211softmac_stop_scan(sm);
+	ieee80211softmac_wait_for_scan(sm);
+	
+	spin_lock_irqsave(&sm->lock, flags);
+	/* Free all pending assoc work items */
+	cancel_delayed_work(&sm->associnfo.work);
+	
+	/* Free all pending scan work items */
+	if(sm->scaninfo != NULL)
+		cancel_delayed_work(&sm->scaninfo->softmac_scan);	
+	
+	/* Free all pending auth work items */
+	list_for_each_entry(authptr, &sm->auth_queue, list)
+		cancel_delayed_work(&authptr->work);
+	
+	/* delete all pending event calls and work items */
+	list_for_each_entry_safe(eventptr, eventtmp, &sm->events, list)
+		cancel_delayed_work(&eventptr->work);
+
+	spin_unlock_irqrestore(&sm->lock, flags);
+	flush_workqueue(sm->workqueue);
+
+	// now we should be save and no longer need locking...
+	spin_lock_irqsave(&sm->lock, flags);
+	/* Free all pending auth work items */
+	list_for_each_entry_safe(authptr, authtmp, &sm->auth_queue, list) {
+		list_del(&authptr->list);
+		kfree(authptr);
+	}
+	
+	/* delete all pending event calls and work items */
+	list_for_each_entry_safe(eventptr, eventtmp, &sm->events, list) {
+		list_del(&eventptr->list);
+		kfree(eventptr);
+	}
+		
+	/* Free all networks */
+	list_for_each_entry_safe(netptr, nettmp, &sm->network_list, list) {
+		ieee80211softmac_del_network_locked(sm, netptr);
+		if(netptr->challenge != NULL)
+			kfree(netptr->challenge);
+		kfree(netptr);
+	}
+
+	spin_unlock_irqrestore(&sm->lock, flags);
+}
+
+void free_ieee80211softmac(struct net_device *dev)
+{
+	struct ieee80211softmac_device *sm = ieee80211_priv(dev);
+	ieee80211softmac_clear_pending_work(sm);	
+	destroy_workqueue(sm->workqueue);
+	kfree(sm->scaninfo);
+	kfree(sm->wpa.IE);
+	free_ieee80211(dev);
+}
+
+static void ieee80211softmac_start_check_rates(struct ieee80211softmac_device *mac)
+{
+	struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
+	/* I took out the sorting check, we're seperating by modulation now. */
+	if (ri->count)
+		return;
+	/* otherwise assume we hav'em all! */
+	if (mac->ieee->modulation & IEEE80211_CCK_MODULATION) {
+		ri->rates[ri->count++] = IEEE80211_CCK_RATE_1MB;
+		ri->rates[ri->count++] = IEEE80211_CCK_RATE_2MB;
+		ri->rates[ri->count++] = IEEE80211_CCK_RATE_5MB;
+		ri->rates[ri->count++] = IEEE80211_CCK_RATE_11MB;
+	}
+	if (mac->ieee->modulation & IEEE80211_OFDM_MODULATION) {
+		ri->rates[ri->count++] = IEEE80211_OFDM_RATE_6MB;
+		ri->rates[ri->count++] = IEEE80211_OFDM_RATE_9MB;
+		ri->rates[ri->count++] = IEEE80211_OFDM_RATE_12MB;
+		ri->rates[ri->count++] = IEEE80211_OFDM_RATE_18MB;
+		ri->rates[ri->count++] = IEEE80211_OFDM_RATE_24MB;
+		ri->rates[ri->count++] = IEEE80211_OFDM_RATE_36MB;
+		ri->rates[ri->count++] = IEEE80211_OFDM_RATE_48MB;
+		ri->rates[ri->count++] = IEEE80211_OFDM_RATE_54MB;
+	}
+}
+
+void ieee80211softmac_start(struct net_device *dev)
+{
+	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
+	struct ieee80211_device *ieee = mac->ieee;
+	u32 change = 0;
+	struct ieee80211softmac_txrates oldrates;
+
+	ieee80211softmac_start_check_rates(mac);
+
+	/* TODO: We need some kind of state machine to lower the default rates
+	 *       if we loose too many packets.
+	 */
+	/* Change the default txrate to the highest possible value.
+	 * The txrate machine will lower it, if it is too high.
+	 */
+	if (mac->txrates_change)
+		oldrates = mac->txrates;
+	if (ieee->modulation & IEEE80211_OFDM_MODULATION) {
+		mac->txrates.default_rate = IEEE80211_OFDM_RATE_54MB;
+		change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
+		mac->txrates.default_fallback = IEEE80211_OFDM_RATE_24MB;
+		change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
+	} else if (ieee->modulation & IEEE80211_CCK_MODULATION) {
+		mac->txrates.default_rate = IEEE80211_CCK_RATE_11MB;
+		change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
+		mac->txrates.default_fallback = IEEE80211_CCK_RATE_5MB;
+		change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
+	} else
+		assert(0);
+	if (mac->txrates_change)
+		mac->txrates_change(dev, change, &oldrates);
+}
+
+void ieee80211softmac_stop(struct net_device *dev)
+{
+	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
+
+	ieee80211softmac_clear_pending_work(mac);
+}
+
+void ieee80211softmac_set_rates(struct net_device *dev, u8 count, u8 *rates)
+{
+	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
+	unsigned long flags;
+	
+	spin_lock_irqsave(&mac->lock, flags);
+	memcpy(mac->ratesinfo.rates, rates, count);
+	mac->ratesinfo.count = count;
+	spin_unlock_irqrestore(&mac->lock, flags);
+}
+
+static u8 raise_rate(struct ieee80211softmac_device *mac, u8 rate)
+{
+	int i;
+	struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
+	
+	for (i=0; i<ri->count-1; i++) {
+		if (ri->rates[i] == rate)
+			return ri->rates[i+1];
+	}
+	/* I guess we can't go any higher... */
+	return ri->rates[ri->count];
+}
+
+u8 ieee80211softmac_lower_rate_delta(struct ieee80211softmac_device *mac, u8 rate, int delta)
+{
+	int i;
+	struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
+	
+	for (i=delta; i<ri->count; i++) {
+		if (ri->rates[i] == rate)
+			return ri->rates[i-delta];
+	}
+	/* I guess we can't go any lower... */
+	return ri->rates[0];
+}
+
+static void ieee80211softmac_add_txrates_badness(struct ieee80211softmac_device *mac,
+						 int amount)
+{
+	struct ieee80211softmac_txrates oldrates;
+	u8 default_rate = mac->txrates.default_rate;
+	u8 default_fallback = mac->txrates.default_fallback;
+	u32 changes = 0;
+
+	//TODO: This is highly experimental code.
+	//      Maybe the dynamic rate selection does not work
+	//      and it has to be removed again.
+
+printk("badness %d\n", mac->txrate_badness);
+	mac->txrate_badness += amount;
+	if (mac->txrate_badness <= -1000) {
+		/* Very small badness. Try a faster bitrate. */
+		if (mac->txrates_change)
+			memcpy(&oldrates, &mac->txrates, sizeof(oldrates));
+		default_rate = raise_rate(mac, default_rate);
+		changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
+		default_fallback = get_fallback_rate(mac, default_rate);
+		changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
+		mac->txrate_badness = 0;
+printk("Bitrate raised to %u\n", default_rate);
+	} else if (mac->txrate_badness >= 10000) {
+		/* Very high badness. Try a slower bitrate. */
+		if (mac->txrates_change)
+			memcpy(&oldrates, &mac->txrates, sizeof(oldrates));
+		default_rate = lower_rate(mac, default_rate);
+		changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
+		default_fallback = get_fallback_rate(mac, default_rate);
+		changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
+		mac->txrate_badness = 0;
+printk("Bitrate lowered to %u\n", default_rate);
+	}
+
+	mac->txrates.default_rate = default_rate;
+	mac->txrates.default_fallback = default_fallback;
+
+	if (changes && mac->txrates_change)
+		mac->txrates_change(mac->dev, changes, &oldrates);
+}
+
+void ieee80211softmac_fragment_lost(struct net_device *dev,
+				    u16 wl_seq)
+{
+	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&mac->lock, flags);
+	ieee80211softmac_add_txrates_badness(mac, 1000);
+	//TODO
+
+	spin_unlock_irqrestore(&mac->lock, flags);
+}
+
+static int rate_cmp(const void *a_, const void *b_) {
+	u8 *a, *b;
+	a = (u8*)a_;
+	b = (u8*)b_;
+	return ((*a & ~IEEE80211_BASIC_RATE_MASK) - (*b & ~IEEE80211_BASIC_RATE_MASK));
+}
+
+/* Allocate a softmac network struct and fill it from a network */
+struct ieee80211softmac_network *
+ieee80211softmac_create_network(struct ieee80211softmac_device *mac,
+	struct ieee80211_network *net)
+{
+	struct ieee80211softmac_network *softnet;
+	softnet = kzalloc(sizeof(struct ieee80211softmac_network), GFP_ATOMIC);
+	if(softnet == NULL)
+		return NULL;
+	memcpy(softnet->bssid, net->bssid, ETH_ALEN);
+	softnet->channel = net->channel;
+	softnet->essid.len = net->ssid_len;
+	memcpy(softnet->essid.data, net->ssid, softnet->essid.len);
+	
+	/* copy rates over */
+	softnet->supported_rates.count = net->rates_len;
+	memcpy(&softnet->supported_rates.rates[0], net->rates, net->rates_len);
+	memcpy(&softnet->supported_rates.rates[softnet->supported_rates.count], net->rates_ex, net->rates_ex_len);
+	softnet->supported_rates.count += net->rates_ex_len;
+	sort(softnet->supported_rates.rates, softnet->supported_rates.count, sizeof(softnet->supported_rates.rates[0]), rate_cmp, NULL);
+	
+	softnet->capabilities = net->capability;
+	return softnet;
+}
+
+
+/* Add a network to the list, while locked */
+void
+ieee80211softmac_add_network_locked(struct ieee80211softmac_device *mac,
+	struct ieee80211softmac_network *add_net)
+{
+	struct list_head *list_ptr;
+	struct ieee80211softmac_network *softmac_net = NULL;
+
+	list_for_each(list_ptr, &mac->network_list) {
+		softmac_net = list_entry(list_ptr, struct ieee80211softmac_network, list);
+		if(!memcmp(softmac_net->bssid, add_net->bssid, ETH_ALEN))
+			break;
+		else
+			softmac_net = NULL;
+	}
+	if(softmac_net == NULL)
+		list_add(&(add_net->list), &mac->network_list);
+}
+
+/* Add a network to the list, with locking */
+void
+ieee80211softmac_add_network(struct ieee80211softmac_device *mac,
+	struct ieee80211softmac_network *add_net)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&mac->lock, flags);
+	ieee80211softmac_add_network_locked(mac, add_net);
+	spin_unlock_irqrestore(&mac->lock, flags);
+}
+
+
+/* Delete a network from the list, while locked*/
+void
+ieee80211softmac_del_network_locked(struct ieee80211softmac_device *mac,
+	struct ieee80211softmac_network *del_net)
+{
+	list_del(&(del_net->list));
+}
+
+/* Delete a network from the list with locking */
+void
+ieee80211softmac_del_network(struct ieee80211softmac_device *mac,
+	struct ieee80211softmac_network *del_net)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&mac->lock, flags);
+	ieee80211softmac_del_network_locked(mac, del_net);
+	spin_unlock_irqrestore(&mac->lock, flags);
+}
+
+/* Get a network from the list by MAC while locked */
+struct ieee80211softmac_network *
+ieee80211softmac_get_network_by_bssid_locked(struct ieee80211softmac_device *mac,
+	u8 *bssid)
+{
+	struct list_head *list_ptr;
+	struct ieee80211softmac_network *softmac_net = NULL;
+	list_for_each(list_ptr, &mac->network_list) {
+		softmac_net = list_entry(list_ptr, struct ieee80211softmac_network, list);
+		if(!memcmp(softmac_net->bssid, bssid, ETH_ALEN))
+			break;
+		else
+			softmac_net = NULL;
+	}
+	return softmac_net;
+}
+
+/* Get a network from the list by BSSID with locking */
+struct ieee80211softmac_network *
+ieee80211softmac_get_network_by_bssid(struct ieee80211softmac_device *mac,
+	u8 *bssid)
+{
+	unsigned long flags;
+	struct ieee80211softmac_network *softmac_net;
+	
+	spin_lock_irqsave(&mac->lock, flags);
+	softmac_net = ieee80211softmac_get_network_by_bssid_locked(mac, bssid);
+	spin_unlock_irqrestore(&mac->lock, flags);
+	return softmac_net;
+}
+
+/* Get a network from the list by ESSID while locked */
+struct ieee80211softmac_network *
+ieee80211softmac_get_network_by_essid_locked(struct ieee80211softmac_device *mac,
+	struct ieee80211softmac_essid *essid)
+{
+	struct list_head *list_ptr;
+	struct ieee80211softmac_network *softmac_net = NULL;
+
+	list_for_each(list_ptr, &mac->network_list) {
+		softmac_net = list_entry(list_ptr, struct ieee80211softmac_network, list);
+		if (softmac_net->essid.len == essid->len &&
+			!memcmp(softmac_net->essid.data, essid->data, essid->len))
+			return softmac_net;
+	}
+	return NULL;
+}
+
+/* Get a network from the list by ESSID with locking */
+struct ieee80211softmac_network *
+ieee80211softmac_get_network_by_essid(struct ieee80211softmac_device *mac,
+	struct ieee80211softmac_essid *essid)	
+{
+	unsigned long flags;
+	struct ieee80211softmac_network *softmac_net = NULL;
+
+	spin_lock_irqsave(&mac->lock, flags);
+	softmac_net = ieee80211softmac_get_network_by_essid_locked(mac, essid);	
+	spin_unlock_irqrestore(&mac->lock, flags);
+	return softmac_net;
+}
+
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL_GPL(alloc_ieee80211softmac);
+EXPORT_SYMBOL_GPL(free_ieee80211softmac);
+EXPORT_SYMBOL_GPL(ieee80211softmac_set_rates);
+EXPORT_SYMBOL_GPL(ieee80211softmac_start);
+EXPORT_SYMBOL_GPL(ieee80211softmac_stop);
+EXPORT_SYMBOL_GPL(ieee80211softmac_fragment_lost);
+EXPORT_SYMBOL_GPL(ieee80211softmac_clear_pending_work);

net/ieee80211/softmac/ieee80211softmac_priv.h

+#ifndef IEEE80211SOFTMAC_PRIV_H_
+#define IEEE80211SOFTMAC_PRIV_H_
+
+#include <net/ieee80211softmac.h>
+#include <net/ieee80211softmac_wx.h>
+#include <linux/kernel.h>
+#include <linux/stringify.h>
+
+
+#define PFX				"SoftMAC: "
+
+#ifdef assert
+# undef assert
+#endif
+#ifdef CONFIG_IEEE80211_SOFTMAC_DEBUG
+#define assert(expr) \
+	do {										\
+		if (unlikely(!(expr))) {						\
+		printkl(KERN_ERR PFX "ASSERTION FAILED (%s) at: %s:%d:%s()\n", #expr,	\
+			__FILE__, __LINE__, __FUNCTION__);				\
+		}									\
+	} while (0)
+#else
+#define assert(expr) do {} while (0)
+#endif
+
+/* rate limited printk(). */
+#ifdef printkl
+# undef printkl
+#endif
+#define printkl(f, x...)  do { if (printk_ratelimit()) printk(f ,##x); } while (0)
+/* rate limited printk() for debugging */
+#ifdef dprintkl
+# undef dprintkl
+#endif
+#ifdef CONFIG_IEEE80211_SOFTMAC_DEBUG
+# define dprintkl		printkl
+#else
+# define dprintkl(f, x...)	do { /* nothing */ } while (0)
+#endif
+
+/* debugging printk() */
+#ifdef dprintk
+# undef dprintk
+#endif
+#ifdef CONFIG_IEEE80211_SOFTMAC_DEBUG
+# define dprintk(f, x...)  do { printk(f ,##x); } while (0)
+#else
+# define dprintk(f, x...)  do { /* nothing */ } while (0)
+#endif
+
+#ifdef function_enter
+# undef function_enter
+#endif
+#ifdef CONFIG_IEEE80211_SOFTMAC_DEBUG
+# define function_enter() do { printk(KERN_DEBUG PFX "%s:%d:%s()\n", __FILE__, __LINE__, __FUNCTION__); } while (0)
+#else
+# define function_enter() do { /* nothing */ } while (0)
+#endif
+
+/* private definitions and prototypes */
+
+/*** prototypes from _scan.c */
+void ieee80211softmac_scan(void *sm);
+/* for internal use if scanning is needed */
+int ieee80211softmac_start_scan(struct ieee80211softmac_device *mac);
+void ieee80211softmac_stop_scan(struct ieee80211softmac_device *mac);
+void ieee80211softmac_wait_for_scan(struct ieee80211softmac_device *mac);
+
+/* for use by _module.c to assign to the callbacks */
+int ieee80211softmac_start_scan_implementation(struct net_device *dev);
+void ieee80211softmac_stop_scan_implementation(struct net_device *dev);
+void ieee80211softmac_wait_for_scan_implementation(struct net_device *dev);
+
+/*** Network prototypes from _module.c */
+struct ieee80211softmac_network * ieee80211softmac_create_network(
+	struct ieee80211softmac_device *mac, struct ieee80211_network *net);
+void ieee80211softmac_add_network_locked(struct ieee80211softmac_device *mac,
+	struct ieee80211softmac_network *net);
+void ieee80211softmac_add_network(struct ieee80211softmac_device *mac,
+	struct ieee80211softmac_network *net);
+void ieee80211softmac_del_network_locked(struct ieee80211softmac_device *mac,
+	struct ieee80211softmac_network *net);
+void ieee80211softmac_del_network(struct ieee80211softmac_device *mac,
+	struct ieee80211softmac_network *net);
+struct ieee80211softmac_network * ieee80211softmac_get_network_by_bssid_locked(
+	struct ieee80211softmac_device *mac, u8 *ea);
+struct ieee80211softmac_network * ieee80211softmac_get_network_by_bssid(
+	struct ieee80211softmac_device *mac, u8 *ea);
+struct ieee80211softmac_network * ieee80211softmac_get_network_by_ssid_locked(
+	struct ieee80211softmac_device *mac, u8 *ssid, u8 ssid_len);
+struct ieee80211softmac_network * ieee80211softmac_get_network_by_ssid(
+	struct ieee80211softmac_device *mac, u8 *ssid, u8 ssid_len);
+
+
+/* Rates related */
+u8 ieee80211softmac_lower_rate_delta(struct ieee80211softmac_device *mac, u8 rate, int delta);
+static inline u8 lower_rate(struct ieee80211softmac_device *mac, u8 rate) {
+	return ieee80211softmac_lower_rate_delta(mac, rate, 1);
+}
+
+static inline u8 get_fallback_rate(struct ieee80211softmac_device *mac, u8 rate)
+{
+	return ieee80211softmac_lower_rate_delta(mac, rate, 2);
+}
+                
+
+/*** prototypes from _io.c */
+int ieee80211softmac_send_mgt_frame(struct ieee80211softmac_device *mac,
+	void* ptrarg, u32 type, u32 arg);
+
+/*** prototypes from _auth.c */
+/* do these have to go into the public header? */
+int ieee80211softmac_auth_req(struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net);
+int ieee80211softmac_deauth_req(struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net, int reason);
+
+/* for use by _module.c to assign to the callbacks */
+int ieee80211softmac_auth_resp(struct net_device *dev, struct ieee80211_auth *auth);
+int ieee80211softmac_deauth_resp(struct net_device *dev, struct ieee80211_auth *auth);
+
+/*** prototypes from _assoc.c */
+void ieee80211softmac_assoc_work(void *d);
+int ieee80211softmac_handle_assoc_response(struct net_device * dev,
+					   struct ieee80211_assoc_response * resp,
+					   struct ieee80211_network * network);
+int ieee80211softmac_handle_disassoc(struct net_device * dev,
+				     struct ieee80211_disassoc * disassoc);
+void ieee80211softmac_assoc_timeout(void *d);
+
+/* some helper functions */
+static inline int ieee80211softmac_scan_handlers_check_self(struct ieee80211softmac_device *sm)
+{
+	return (sm->start_scan == ieee80211softmac_start_scan_implementation) && 
+		(sm->stop_scan == ieee80211softmac_stop_scan_implementation) && 
+		(sm->wait_for_scan == ieee80211softmac_wait_for_scan_implementation);
+}
+
+static inline int ieee80211softmac_scan_sanity_check(struct ieee80211softmac_device *sm)
+{
+	return ((sm->start_scan != ieee80211softmac_start_scan_implementation) && 
+		(sm->stop_scan != ieee80211softmac_stop_scan_implementation) && 
+		(sm->wait_for_scan != ieee80211softmac_wait_for_scan_implementation)
+		) || ieee80211softmac_scan_handlers_check_self(sm);
+}
+
+#define IEEE80211SOFTMAC_PROBE_DELAY		HZ/2
+#define IEEE80211SOFTMAC_WORKQUEUE_NAME_LEN	(17 + IFNAMSIZ)
+
+struct ieee80211softmac_network {
+	struct list_head		list;	/* List */
+	/* Network information copied from ieee80211_network */
+	u8 bssid[ETH_ALEN];
+	u8 channel;
+	struct ieee80211softmac_essid essid;
+
+	struct ieee80211softmac_ratesinfo supported_rates;
+
+	/* SoftMAC specific */
+	u16 authenticating:1,			/* Status Flags */
+	    authenticated:1,
+	    auth_desynced_once:1;
+
+	u16 capabilities;			/* Capabilities bitfield */
+	u8 challenge_len;			/* Auth Challenge length */
+	char *challenge;			/* Challenge Text */
+};
+
+/* structure used to keep track of networks we're auth'ing to */
+struct ieee80211softmac_auth_queue_item {
+	struct list_head		list;	/* List head */
+	struct ieee80211softmac_network	*net;	/* Network to auth */
+	struct ieee80211softmac_device	*mac;	/* SoftMAC device */
+	u8 retry;				/* Retry limit */
+	u8 state;				/* Auth State */
+	struct work_struct		work;	/* Work queue */
+};
+
+/* scanning information */
+struct ieee80211softmac_scaninfo {
+	u8 current_channel_idx,
+	   number_channels;
+	struct ieee80211_channel *channels;
+	u8 started:1,
+	   stop:1;
+	u8 skip_flags;
+	struct completion finished;
+	struct work_struct softmac_scan;
+};
+
+/* private event struct */
+struct ieee80211softmac_event {
+	struct list_head list;
+	int event_type;
+	void *event_context;
+	struct work_struct work;
+	notify_function_ptr fun;
+	void *context;
+	struct ieee80211softmac_device *mac;
+};
+
+void ieee80211softmac_call_events(struct ieee80211softmac_device *mac, int event, void *event_context);
+void ieee80211softmac_call_events_locked(struct ieee80211softmac_device *mac, int event, void *event_context);
+int ieee80211softmac_notify_internal(struct ieee80211softmac_device *mac,
+	int event, void *event_context, notify_function_ptr fun, void *context, gfp_t gfp_mask);
+
+#endif /* IEEE80211SOFTMAC_PRIV_H_ */

net/ieee80211/softmac/ieee80211softmac_scan.c

+/*
+ * Scanning routines.
+ *
+ * These are not exported because they're assigned to the function pointers.
+ */
+
+#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);
+
+	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);
+			//TODO: Probe the 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);
+			queue_delayed_work(sm->workqueue, &si->softmac_scan, IEEE80211SOFTMAC_PROBE_DELAY);
+			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;
+	INIT_COMPLETION(sm->scaninfo->finished);
+	queue_work(sm->workqueue, &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);
+	
+	ieee80211softmac_call_events(sm, IEEE80211SOFTMAC_EVENT_SCAN_FINISHED, NULL);
+}
+
+EXPORT_SYMBOL_GPL(ieee80211softmac_scan_finished);

net/ieee80211/softmac/ieee80211softmac_wx.c

+/*
+ * This file contains our _wx handlers. Make sure you EXPORT_SYMBOL_GPL them
+ */
+
+#include "ieee80211softmac_priv.h"
+
+#include <net/iw_handler.h>
+
+
+int
+ieee80211softmac_wx_trigger_scan(struct net_device *net_dev,
+				 struct iw_request_info *info,
+				 union iwreq_data *data,
+				 char *extra)
+{
+	struct ieee80211softmac_device *sm = ieee80211_priv(net_dev);
+	return ieee80211softmac_start_scan(sm);
+}
+EXPORT_SYMBOL_GPL(ieee80211softmac_wx_trigger_scan);
+
+
+int
+ieee80211softmac_wx_get_scan_results(struct net_device *net_dev,
+				     struct iw_request_info *info,
+				     union iwreq_data *data,
+				     char *extra)
+{
+	struct ieee80211softmac_device *sm = ieee80211_priv(net_dev);
+	return ieee80211_wx_get_scan(sm->ieee, info, data, extra);
+}
+EXPORT_SYMBOL_GPL(ieee80211softmac_wx_get_scan_results);
+
+int
+ieee80211softmac_wx_set_essid(struct net_device *net_dev,
+			      struct iw_request_info *info,
+			      union iwreq_data *data,
+			      char *extra)
+{
+	struct ieee80211softmac_device *sm = ieee80211_priv(net_dev);
+	int length = 0;
+	unsigned long flags;
+	
+	spin_lock_irqsave(&sm->lock, flags);
+	
+	sm->associnfo.static_essid = 0;
+
+	if (data->essid.flags && data->essid.length && extra /*required?*/) {
+		length = min(data->essid.length - 1, IW_ESSID_MAX_SIZE);
+		if (length) {
+			memcpy(sm->associnfo.req_essid.data, extra, length);
+			sm->associnfo.static_essid = 1;
+		}
+	}
+	sm->associnfo.scan_retry = IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT;
+
+	/* set our requested ESSID length.
+	 * If applicable, we have already copied the data in */
+	sm->associnfo.req_essid.len = length;
+
+	/* queue lower level code to do work (if necessary) */
+	queue_work(sm->workqueue, &sm->associnfo.work);
+
+	spin_unlock_irqrestore(&sm->lock, flags);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ieee80211softmac_wx_set_essid);
+
+int
+ieee80211softmac_wx_get_essid(struct net_device *net_dev,
+			      struct iw_request_info *info,
+			      union iwreq_data *data,
+			      char *extra)
+{
+	struct ieee80211softmac_device *sm = ieee80211_priv(net_dev);
+	unsigned long flags;
+
+	/* avoid getting inconsistent information */
+	spin_lock_irqsave(&sm->lock, flags);
+	/* If all fails, return ANY (empty) */
+	data->essid.length = 0;
+	data->essid.flags = 0;  /* active */
+	
+	/* If we have a statically configured ESSID then return it */
+	if (sm->associnfo.static_essid) {
+		data->essid.length = sm->associnfo.req_essid.len;
+		data->essid.flags = 1;  /* active */
+		memcpy(extra, sm->associnfo.req_essid.data, sm->associnfo.req_essid.len);
+	}
+	
+	/* If we're associating/associated, return that */
+	if (sm->associated || sm->associnfo.associating) {
+		data->essid.length = sm->associnfo.associate_essid.len;
+		data->essid.flags = 1;  /* active */
+		memcpy(extra, sm->associnfo.associate_essid.data, sm->associnfo.associate_essid.len);
+	}
+	spin_unlock_irqrestore(&sm->lock, flags);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ieee80211softmac_wx_get_essid);
+
+int
+ieee80211softmac_wx_set_rate(struct net_device *net_dev,
+			     struct iw_request_info *info,
+			     union iwreq_data *data,
+			     char *extra)
+{
+	struct ieee80211softmac_device *mac = ieee80211_priv(net_dev);
+	struct ieee80211_device *ieee = mac->ieee;
+	unsigned long flags;
+	s32 in_rate = data->bitrate.value;
+	u8 rate;
+	int is_ofdm = 0;
+	int err = -EINVAL;
+
+	if (in_rate == -1) {
+		/* automatic detect */
+		if (ieee->modulation & IEEE80211_OFDM_MODULATION)
+			in_rate = 54000000;
+		else
+			in_rate = 11000000;
+	}
+
+	switch (in_rate) {
+	case 1000000:
+		rate = IEEE80211_CCK_RATE_1MB;
+		break;
+	case 2000000:
+		rate = IEEE80211_CCK_RATE_2MB;
+		break;
+	case 5500000:
+		rate = IEEE80211_CCK_RATE_5MB;
+		break;
+	case 11000000:
+		rate = IEEE80211_CCK_RATE_11MB;
+		break;
+	case 6000000:
+		rate = IEEE80211_OFDM_RATE_6MB;
+		is_ofdm = 1;
+		break;
+	case 9000000:
+		rate = IEEE80211_OFDM_RATE_9MB;
+		is_ofdm = 1;
+		break;
+	case 12000000:
+		rate = IEEE80211_OFDM_RATE_12MB;
+		is_ofdm = 1;
+		break;
+	case 18000000:
+		rate = IEEE80211_OFDM_RATE_18MB;
+		is_ofdm = 1;
+		break;
+	case 24000000:
+		rate = IEEE80211_OFDM_RATE_24MB;
+		is_ofdm = 1;
+		break;
+	case 36000000:
+		rate = IEEE80211_OFDM_RATE_36MB;
+		is_ofdm = 1;
+		break;
+	case 48000000:
+		rate = IEEE80211_OFDM_RATE_48MB;
+		is_ofdm = 1;
+		break;
+	case 54000000:
+		rate = IEEE80211_OFDM_RATE_54MB;
+		is_ofdm = 1;
+		break;
+	default:
+		goto out;
+	}
+
+	spin_lock_irqsave(&mac->lock, flags);
+
+	/* Check if correct modulation for this PHY. */
+	if (is_ofdm && !(ieee->modulation & IEEE80211_OFDM_MODULATION))
+		goto out_unlock;
+
+	mac->txrates.default_rate = rate;
+	mac->txrates.default_fallback = lower_rate(mac, rate);
+	err = 0;
+
+out_unlock:	
+	spin_unlock_irqrestore(&mac->lock, flags);
+out:
+	return err;
+}
+EXPORT_SYMBOL_GPL(ieee80211softmac_wx_set_rate);
+
+int
+ieee80211softmac_wx_get_rate(struct net_device *net_dev,
+			     struct iw_request_info *info,
+			     union iwreq_data *data,
+			     char *extra)
+{
+	struct ieee80211softmac_device *mac = ieee80211_priv(net_dev);
+	unsigned long flags;
+	int err = -EINVAL;
+
+	spin_lock_irqsave(&mac->lock, flags);
+	switch (mac->txrates.default_rate) {
+	case IEEE80211_CCK_RATE_1MB:
+		data->bitrate.value = 1000000;
+		break;
+	case IEEE80211_CCK_RATE_2MB:
+		data->bitrate.value = 2000000;
+		break;
+	case IEEE80211_CCK_RATE_5MB:
+		data->bitrate.value = 5500000;
+		break;
+	case IEEE80211_CCK_RATE_11MB:
+		data->bitrate.value = 11000000;
+		break;
+	case IEEE80211_OFDM_RATE_6MB:
+		data->bitrate.value = 6000000;
+		break;
+	case IEEE80211_OFDM_RATE_9MB:
+		data->bitrate.value = 9000000;
+		break;
+	case IEEE80211_OFDM_RATE_12MB:
+		data->bitrate.value = 12000000;
+		break;
+	case IEEE80211_OFDM_RATE_18MB:
+		data->bitrate.value = 18000000;
+		break;
+	case IEEE80211_OFDM_RATE_24MB:
+		data->bitrate.value = 24000000;
+		break;
+	case IEEE80211_OFDM_RATE_36MB:
+		data->bitrate.value = 36000000;
+		break;
+	case IEEE80211_OFDM_RATE_48MB:
+		data->bitrate.value = 48000000;
+		break;
+	case IEEE80211_OFDM_RATE_54MB:
+		data->bitrate.value = 54000000;
+		break;
+	default:
+		assert(0);
+		goto out_unlock;
+	}
+	err = 0;
+out_unlock:
+	spin_unlock_irqrestore(&mac->lock, flags);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(ieee80211softmac_wx_get_rate);
+
+int
+ieee80211softmac_wx_get_wap(struct net_device *net_dev,
+			    struct iw_request_info *info,
+			    union iwreq_data *data,
+			    char *extra)
+{
+	struct ieee80211softmac_device *mac = ieee80211_priv(net_dev);
+	int err = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&mac->lock, flags);
+	if (mac->associnfo.bssvalid)
+		memcpy(data->ap_addr.sa_data, mac->associnfo.bssid, ETH_ALEN);
+	else
+		memset(data->ap_addr.sa_data, 0xff, ETH_ALEN);
+	data->ap_addr.sa_family = ARPHRD_ETHER;
+	spin_unlock_irqrestore(&mac->lock, flags);
+	return err;
+}
+EXPORT_SYMBOL_GPL(ieee80211softmac_wx_get_wap);
+
+int
+ieee80211softmac_wx_set_wap(struct net_device *net_dev,
+			    struct iw_request_info *info,
+			    union iwreq_data *data,
+			    char *extra)
+{
+	struct ieee80211softmac_device *mac = ieee80211_priv(net_dev);
+	static const unsigned char any[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+	static const unsigned char off[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+	unsigned long flags;
+
+	/* sanity check */
+	if (data->ap_addr.sa_family != ARPHRD_ETHER) {
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&mac->lock, flags);
+	if (!memcmp(any, data->ap_addr.sa_data, ETH_ALEN) ||
+	    !memcmp(off, data->ap_addr.sa_data, ETH_ALEN)) {
+		queue_work(mac->workqueue, &mac->associnfo.work);
+		goto out;
+        } else {
+		if (!memcmp(mac->associnfo.bssid, data->ap_addr.sa_data, ETH_ALEN)) {
+			if (mac->associnfo.associating || mac->associated) {
+			/* bssid unchanged and associated or associating - just return */
+				goto out;
+			}
+		} else {
+			/* copy new value in data->ap_addr.sa_data to bssid */
+			memcpy(mac->associnfo.bssid, data->ap_addr.sa_data, ETH_ALEN);
+		}	
+		/* queue associate if new bssid or (old one again and not associated) */
+		queue_work(mac->workqueue,&mac->associnfo.work);
+        }
+
+out:
+	spin_unlock_irqrestore(&mac->lock, flags);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ieee80211softmac_wx_set_wap);
+
+int
+ieee80211softmac_wx_set_genie(struct net_device *dev,
+			      struct iw_request_info *info,
+			      union iwreq_data *wrqu,
+			      char *extra)
+{
+	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
+	unsigned long flags;
+	int err = 0;
+	char *buf;
+	int i;
+	
+	spin_lock_irqsave(&mac->lock, flags);
+	/* bleh. shouldn't be locked for that kmalloc... */
+
+	if (wrqu->data.length) {
+		if ((wrqu->data.length < 2) || (extra[1]+2 != wrqu->data.length)) {
+			/* this is an IE, so the length must be
+			 * correct. Is it possible though that
+			 * more than one IE is passed in?
+			 */
+			err = -EINVAL;
+			goto out;
+		}
+		if (mac->wpa.IEbuflen <= wrqu->data.length) {
+			buf = kmalloc(wrqu->data.length, GFP_ATOMIC);
+			if (!buf) {
+				err = -ENOMEM;
+				goto out;
+			}
+			kfree(mac->wpa.IE);
+			mac->wpa.IE = buf;
+			mac->wpa.IEbuflen = wrqu->data.length;
+		}
+		memcpy(mac->wpa.IE, extra, wrqu->data.length);
+		dprintk(KERN_INFO PFX "generic IE set to ");
+		for (i=0;i<wrqu->data.length;i++)
+			dprintk("%.2x", mac->wpa.IE[i]);
+		dprintk("\n");
+		mac->wpa.IElen = wrqu->data.length;
+	} else {
+		kfree(mac->wpa.IE);
+		mac->wpa.IE = NULL;
+		mac->wpa.IElen = 0;
+		mac->wpa.IEbuflen = 0;
+	}
+
+ out:	
+	spin_unlock_irqrestore(&mac->lock, flags);
+	return err;
+}
+EXPORT_SYMBOL_GPL(ieee80211softmac_wx_set_genie);
+
+int
+ieee80211softmac_wx_get_genie(struct net_device *dev,
+			      struct iw_request_info *info,
+			      union iwreq_data *wrqu,
+			      char *extra)
+{
+	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
+	unsigned long flags;
+	int err = 0;
+	int space = wrqu->data.length;
+	
+	spin_lock_irqsave(&mac->lock, flags);
+	
+	wrqu->data.length = 0;
+	
+	if (mac->wpa.IE && mac->wpa.IElen) {
+		wrqu->data.length = mac->wpa.IElen;
+		if (mac->wpa.IElen <= space)
+			memcpy(extra, mac->wpa.IE, mac->wpa.IElen);
+		else
+			err = -E2BIG;
+	}
+	spin_unlock_irqrestore(&mac->lock, flags);
+	return err;
+}
+EXPORT_SYMBOL_GPL(ieee80211softmac_wx_get_genie);
+