[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_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_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);