[deliverable/linux.git] / 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);
Commit	Line	Data
370121e5 JB	1	#include "ieee80211softmac_priv.h"
	2	#include <linux/sort.h>
	3
	4	struct net_device *alloc_ieee80211softmac(int sizeof_priv)
	5	{
	6	struct ieee80211softmac_device *softmac;
	7	struct net_device *dev;
	8
	9	dev = alloc_ieee80211(sizeof(struct ieee80211softmac_device) + sizeof_priv);
	10	softmac = ieee80211_priv(dev);
	11	softmac->dev = dev;
	12	softmac->ieee = netdev_priv(dev);
	13	spin_lock_init(&softmac->lock);
	14
	15	softmac->ieee->handle_auth = ieee80211softmac_auth_resp;
	16	softmac->ieee->handle_deauth = ieee80211softmac_deauth_resp;
	17	softmac->ieee->handle_assoc_response = ieee80211softmac_handle_assoc_response;
	18	softmac->ieee->handle_disassoc = ieee80211softmac_handle_disassoc;
	19	softmac->scaninfo = NULL;
	20
	21	/* TODO: initialise all the other callbacks in the ieee struct
	22	* (once they're written)
	23	*/
	24
	25	softmac->workqueue = create_workqueue("80211softmac");
	26	if (!softmac->workqueue)
	27	goto err_free_ieee80211;
	28
	29	INIT_LIST_HEAD(&softmac->auth_queue);
	30	INIT_LIST_HEAD(&softmac->network_list);
	31	INIT_LIST_HEAD(&softmac->events);
	32
	33	INIT_WORK(&softmac->associnfo.work, ieee80211softmac_assoc_work, softmac);
	34	INIT_WORK(&softmac->associnfo.timeout, ieee80211softmac_assoc_timeout, softmac);
	35	softmac->start_scan = ieee80211softmac_start_scan_implementation;
	36	softmac->wait_for_scan = ieee80211softmac_wait_for_scan_implementation;
	37	softmac->stop_scan = ieee80211softmac_stop_scan_implementation;
	38
	39	//TODO: The mcast rate has to be assigned dynamically somewhere (in scanning, association. Not sure...)
	40	// It has to be set to the highest rate all stations in the current network can handle.
	41	softmac->txrates.mcast_rate = IEEE80211_CCK_RATE_1MB;
	42	softmac->txrates.mcast_fallback = IEEE80211_CCK_RATE_1MB;
	43	/* This is reassigned in ieee80211softmac_start to sane values. */
	44	softmac->txrates.default_rate = IEEE80211_CCK_RATE_1MB;
	45	softmac->txrates.default_fallback = IEEE80211_CCK_RATE_1MB;
	46
	47	/* should we also assign softmac->mgmt_xmit here so
	48	* that it is always valid? If so, we probably want
	49	* to define a new function for that which just
	50	* wraps ieee80211_tx_frame
	51	*/
	52
	53	/* until associated, we're not ready */
	54	dev->flags &= ~IFF_RUNNING;
	55
	56	return dev;
	57
	58	err_free_ieee80211:
	59	free_ieee80211(dev);
	60
	61	return NULL;
	62	}
	63
	64	/* Clears the pending work queue items, stops all scans, etc. */
65	void
66	ieee80211softmac_clear_pending_work(struct ieee80211softmac_device *sm)
67	{
68	unsigned long flags;
69	struct ieee80211softmac_event eventptr, eventtmp;
70	struct ieee80211softmac_auth_queue_item authptr, authtmp;
71	struct ieee80211softmac_network netptr, nettmp;
72
73	ieee80211softmac_stop_scan(sm);
74	ieee80211softmac_wait_for_scan(sm);
75
76	spin_lock_irqsave(&sm->lock, flags);
77	/* Free all pending assoc work items */
78	cancel_delayed_work(&sm->associnfo.work);
79
80	/* Free all pending scan work items */
81	if(sm->scaninfo != NULL)
82	cancel_delayed_work(&sm->scaninfo->softmac_scan);
83
84	/* Free all pending auth work items */
85	list_for_each_entry(authptr, &sm->auth_queue, list)
86	cancel_delayed_work(&authptr->work);
87
88	/* delete all pending event calls and work items */
89	list_for_each_entry_safe(eventptr, eventtmp, &sm->events, list)
90	cancel_delayed_work(&eventptr->work);
91
92	spin_unlock_irqrestore(&sm->lock, flags);
93	flush_workqueue(sm->workqueue);
94
95	// now we should be save and no longer need locking...
96	spin_lock_irqsave(&sm->lock, flags);
97	/* Free all pending auth work items */
98	list_for_each_entry_safe(authptr, authtmp, &sm->auth_queue, list) {
99	list_del(&authptr->list);
100	kfree(authptr);
101	}
102
103	/* delete all pending event calls and work items */
104	list_for_each_entry_safe(eventptr, eventtmp, &sm->events, list) {
105	list_del(&eventptr->list);
106	kfree(eventptr);
107	}
108
109	/* Free all networks */
110	list_for_each_entry_safe(netptr, nettmp, &sm->network_list, list) {
111	ieee80211softmac_del_network_locked(sm, netptr);
112	if(netptr->challenge != NULL)
113	kfree(netptr->challenge);
114	kfree(netptr);
115	}
116
117	spin_unlock_irqrestore(&sm->lock, flags);
118	}
119
120	void free_ieee80211softmac(struct net_device *dev)
121	{
122	struct ieee80211softmac_device *sm = ieee80211_priv(dev);
123	ieee80211softmac_clear_pending_work(sm);
124	destroy_workqueue(sm->workqueue);
125	kfree(sm->scaninfo);
126	kfree(sm->wpa.IE);
127	free_ieee80211(dev);
128	}
129
130	static void ieee80211softmac_start_check_rates(struct ieee80211softmac_device *mac)
131	{
132	struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
133	/* I took out the sorting check, we're seperating by modulation now. */
134	if (ri->count)
135	return;
136	/* otherwise assume we hav'em all! */
137	if (mac->ieee->modulation & IEEE80211_CCK_MODULATION) {
138	ri->rates[ri->count++] = IEEE80211_CCK_RATE_1MB;
139	ri->rates[ri->count++] = IEEE80211_CCK_RATE_2MB;
140	ri->rates[ri->count++] = IEEE80211_CCK_RATE_5MB;
141	ri->rates[ri->count++] = IEEE80211_CCK_RATE_11MB;
142	}
143	if (mac->ieee->modulation & IEEE80211_OFDM_MODULATION) {
144	ri->rates[ri->count++] = IEEE80211_OFDM_RATE_6MB;
145	ri->rates[ri->count++] = IEEE80211_OFDM_RATE_9MB;
146	ri->rates[ri->count++] = IEEE80211_OFDM_RATE_12MB;
147	ri->rates[ri->count++] = IEEE80211_OFDM_RATE_18MB;
148	ri->rates[ri->count++] = IEEE80211_OFDM_RATE_24MB;
149	ri->rates[ri->count++] = IEEE80211_OFDM_RATE_36MB;
150	ri->rates[ri->count++] = IEEE80211_OFDM_RATE_48MB;
151	ri->rates[ri->count++] = IEEE80211_OFDM_RATE_54MB;
152	}
153	}
154
155	void ieee80211softmac_start(struct net_device *dev)
156	{
157	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
158	struct ieee80211_device *ieee = mac->ieee;
159	u32 change = 0;
160	struct ieee80211softmac_txrates oldrates;
161
162	ieee80211softmac_start_check_rates(mac);
163
164	/* TODO: We need some kind of state machine to lower the default rates
165	* if we loose too many packets.
166	*/
167	/* Change the default txrate to the highest possible value.
168	* The txrate machine will lower it, if it is too high.
169	*/
170	if (mac->txrates_change)
171	oldrates = mac->txrates;
172	if (ieee->modulation & IEEE80211_OFDM_MODULATION) {
173	mac->txrates.default_rate = IEEE80211_OFDM_RATE_54MB;
174	change \|= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
175	mac->txrates.default_fallback = IEEE80211_OFDM_RATE_24MB;
176	change \|= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
177	} else if (ieee->modulation & IEEE80211_CCK_MODULATION) {
178	mac->txrates.default_rate = IEEE80211_CCK_RATE_11MB;
179	change \|= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
180	mac->txrates.default_fallback = IEEE80211_CCK_RATE_5MB;
181	change \|= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
182	} else
183	assert(0);
184	if (mac->txrates_change)
185	mac->txrates_change(dev, change, &oldrates);
186	}
187
188	void ieee80211softmac_stop(struct net_device *dev)
189	{
190	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
191
192	ieee80211softmac_clear_pending_work(mac);
193	}
194
195	void ieee80211softmac_set_rates(struct net_device dev, u8 count, u8 rates)
196	{
197	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
198	unsigned long flags;
199
200	spin_lock_irqsave(&mac->lock, flags);
201	memcpy(mac->ratesinfo.rates, rates, count);
202	mac->ratesinfo.count = count;
203	spin_unlock_irqrestore(&mac->lock, flags);
204	}
205
206	static u8 raise_rate(struct ieee80211softmac_device *mac, u8 rate)
207	{
208	int i;
209	struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
210
211	for (i=0; i<ri->count-1; i++) {
212	if (ri->rates[i] == rate)
213	return ri->rates[i+1];
214	}
215	/* I guess we can't go any higher... */
216	return ri->rates[ri->count];
217	}
218
219	u8 ieee80211softmac_lower_rate_delta(struct ieee80211softmac_device *mac, u8 rate, int delta)
220	{
221	int i;
222	struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
223
224	for (i=delta; i<ri->count; i++) {
225	if (ri->rates[i] == rate)
226	return ri->rates[i-delta];
227	}
228	/* I guess we can't go any lower... */
229	return ri->rates[0];
230	}
231
232	static void ieee80211softmac_add_txrates_badness(struct ieee80211softmac_device *mac,
233	int amount)
234	{
235	struct ieee80211softmac_txrates oldrates;
236	u8 default_rate = mac->txrates.default_rate;
237	u8 default_fallback = mac->txrates.default_fallback;
238	u32 changes = 0;
239
240	//TODO: This is highly experimental code.
241	// Maybe the dynamic rate selection does not work
242	// and it has to be removed again.
243
244	printk("badness %d\n", mac->txrate_badness);
245	mac->txrate_badness += amount;
246	if (mac->txrate_badness <= -1000) {
247	/* Very small badness. Try a faster bitrate. */
248	if (mac->txrates_change)
249	memcpy(&oldrates, &mac->txrates, sizeof(oldrates));
250	default_rate = raise_rate(mac, default_rate);
251	changes \|= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
252	default_fallback = get_fallback_rate(mac, default_rate);
253	changes \|= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
254	mac->txrate_badness = 0;
255	printk("Bitrate raised to %u\n", default_rate);
256	} else if (mac->txrate_badness >= 10000) {
257	/* Very high badness. Try a slower bitrate. */
258	if (mac->txrates_change)
259	memcpy(&oldrates, &mac->txrates, sizeof(oldrates));
260	default_rate = lower_rate(mac, default_rate);
261	changes \|= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
262	default_fallback = get_fallback_rate(mac, default_rate);
263	changes \|= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
264	mac->txrate_badness = 0;
265	printk("Bitrate lowered to %u\n", default_rate);
266	}
267
268	mac->txrates.default_rate = default_rate;
269	mac->txrates.default_fallback = default_fallback;
270
271	if (changes && mac->txrates_change)
272	mac->txrates_change(mac->dev, changes, &oldrates);
273	}
274
275	void ieee80211softmac_fragment_lost(struct net_device *dev,
276	u16 wl_seq)
277	{
278	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
279	unsigned long flags;
280
281	spin_lock_irqsave(&mac->lock, flags);
282	ieee80211softmac_add_txrates_badness(mac, 1000);
283	//TODO
284
285	spin_unlock_irqrestore(&mac->lock, flags);
286	}
287
288	static int rate_cmp(const void a_, const void b_) {
289	u8 a, b;
290	a = (u8*)a_;
291	b = (u8*)b_;
292	return ((a & ~IEEE80211_BASIC_RATE_MASK) - (b & ~IEEE80211_BASIC_RATE_MASK));
293	}
294
295	/* Allocate a softmac network struct and fill it from a network */
296	struct ieee80211softmac_network *
297	ieee80211softmac_create_network(struct ieee80211softmac_device *mac,
298	struct ieee80211_network *net)
299	{
300	struct ieee80211softmac_network *softnet;
301	softnet = kzalloc(sizeof(struct ieee80211softmac_network), GFP_ATOMIC);
302	if(softnet == NULL)
303	return NULL;
304	memcpy(softnet->bssid, net->bssid, ETH_ALEN);
305	softnet->channel = net->channel;
306	softnet->essid.len = net->ssid_len;
307	memcpy(softnet->essid.data, net->ssid, softnet->essid.len);
308
309	/* copy rates over */
310	softnet->supported_rates.count = net->rates_len;
311	memcpy(&softnet->supported_rates.rates[0], net->rates, net->rates_len);
312	memcpy(&softnet->supported_rates.rates[softnet->supported_rates.count], net->rates_ex, net->rates_ex_len);
313	softnet->supported_rates.count += net->rates_ex_len;
314	sort(softnet->supported_rates.rates, softnet->supported_rates.count, sizeof(softnet->supported_rates.rates[0]), rate_cmp, NULL);
315
316	softnet->capabilities = net->capability;
317	return softnet;
318	}
319
320
321	/* Add a network to the list, while locked */
322	void
323	ieee80211softmac_add_network_locked(struct ieee80211softmac_device *mac,
324	struct ieee80211softmac_network *add_net)
325	{
326	struct list_head *list_ptr;
327	struct ieee80211softmac_network *softmac_net = NULL;
328
329	list_for_each(list_ptr, &mac->network_list) {
330	softmac_net = list_entry(list_ptr, struct ieee80211softmac_network, list);
331	if(!memcmp(softmac_net->bssid, add_net->bssid, ETH_ALEN))
332	break;
333	else
334	softmac_net = NULL;
335	}
336	if(softmac_net == NULL)
337	list_add(&(add_net->list), &mac->network_list);
338	}
339
340	/* Add a network to the list, with locking */
341	void
342	ieee80211softmac_add_network(struct ieee80211softmac_device *mac,
343	struct ieee80211softmac_network *add_net)
344	{
345	unsigned long flags;
346	spin_lock_irqsave(&mac->lock, flags);
347	ieee80211softmac_add_network_locked(mac, add_net);
348	spin_unlock_irqrestore(&mac->lock, flags);
349	}
350
351
352	/* Delete a network from the list, while locked*/
353	void
354	ieee80211softmac_del_network_locked(struct ieee80211softmac_device *mac,
355	struct ieee80211softmac_network *del_net)
356	{
357	list_del(&(del_net->list));
358	}
359
360	/* Delete a network from the list with locking */
361	void
362	ieee80211softmac_del_network(struct ieee80211softmac_device *mac,
363	struct ieee80211softmac_network *del_net)
364	{
365	unsigned long flags;
366	spin_lock_irqsave(&mac->lock, flags);
367	ieee80211softmac_del_network_locked(mac, del_net);
368	spin_unlock_irqrestore(&mac->lock, flags);
369	}
370
371	/* Get a network from the list by MAC while locked */
372	struct ieee80211softmac_network *
373	ieee80211softmac_get_network_by_bssid_locked(struct ieee80211softmac_device *mac,
374	u8 *bssid)
375	{
376	struct list_head *list_ptr;
377	struct ieee80211softmac_network *softmac_net = NULL;
378	list_for_each(list_ptr, &mac->network_list) {
379	softmac_net = list_entry(list_ptr, struct ieee80211softmac_network, list);
380	if(!memcmp(softmac_net->bssid, bssid, ETH_ALEN))
381	break;
382	else
383	softmac_net = NULL;
384	}
385	return softmac_net;
386	}
387
388	/* Get a network from the list by BSSID with locking */
389	struct ieee80211softmac_network *
390	ieee80211softmac_get_network_by_bssid(struct ieee80211softmac_device *mac,
391	u8 *bssid)
392	{
393	unsigned long flags;
394	struct ieee80211softmac_network *softmac_net;
395
396	spin_lock_irqsave(&mac->lock, flags);
397	softmac_net = ieee80211softmac_get_network_by_bssid_locked(mac, bssid);
398	spin_unlock_irqrestore(&mac->lock, flags);
399	return softmac_net;
400	}
401
402	/* Get a network from the list by ESSID while locked */
403	struct ieee80211softmac_network *
404	ieee80211softmac_get_network_by_essid_locked(struct ieee80211softmac_device *mac,
405	struct ieee80211softmac_essid *essid)
406	{
407	struct list_head *list_ptr;
408	struct ieee80211softmac_network *softmac_net = NULL;
409
410	list_for_each(list_ptr, &mac->network_list) {
411	softmac_net = list_entry(list_ptr, struct ieee80211softmac_network, list);
412	if (softmac_net->essid.len == essid->len &&
413	!memcmp(softmac_net->essid.data, essid->data, essid->len))
414	return softmac_net;
415	}
416	return NULL;
417	}
418
419	/* Get a network from the list by ESSID with locking */
420	struct ieee80211softmac_network *
421	ieee80211softmac_get_network_by_essid(struct ieee80211softmac_device *mac,
422	struct ieee80211softmac_essid *essid)
423	{
424	unsigned long flags;
425	struct ieee80211softmac_network *softmac_net = NULL;
426
427	spin_lock_irqsave(&mac->lock, flags);
428	softmac_net = ieee80211softmac_get_network_by_essid_locked(mac, essid);
429	spin_unlock_irqrestore(&mac->lock, flags);
430	return softmac_net;
431	}
432
433	MODULE_LICENSE("GPL");
434
435	EXPORT_SYMBOL_GPL(alloc_ieee80211softmac);
436	EXPORT_SYMBOL_GPL(free_ieee80211softmac);
437	EXPORT_SYMBOL_GPL(ieee80211softmac_set_rates);
438	EXPORT_SYMBOL_GPL(ieee80211softmac_start);
439	EXPORT_SYMBOL_GPL(ieee80211softmac_stop);
440	EXPORT_SYMBOL_GPL(ieee80211softmac_fragment_lost);
441	EXPORT_SYMBOL_GPL(ieee80211softmac_clear_pending_work);