[PATCH] wireless: Add softmac layer to the kernel

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

1 files changed, 441 insertions, 0 deletions

diff --git a/net/ieee80211/softmac/ieee80211softmac_module.c b/net/ieee80211/softmac/ieee80211softmac_module.c
new file mode 100644
index 000000000000..1244a659cd83
--- /dev/null
+++ b/net/ieee80211/softmac/ieee80211softmac_module.c
@@ -0,0 +1,441 @@
+#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);