[deliverable/linux.git] / net / ieee80211 / softmac / ieee80211softmac_assoc.c

/*
 * This file contains the softmac's association logic.
 *
 * Copyright (c) 2005 Johannes Berg <johannes@sipsolutions.net>
 *                    Joseph Jezak <josejx@gentoo.org>
 *                    Larry Finger <Larry.Finger@lwfinger.net>
 *                    Danny van Dyk <kugelfang@gentoo.org>
 *                    Michael Buesch <mbuesch@freenet.de>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 *
 * The full GNU General Public License is included in this distribution in the
 * file called COPYING.
 */

#include "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 */
	schedule_delayed_work(&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 by bssid,
	 * but only if we've scanned at least once (to get a better list of networks to
	 * select from). If we have not scanned before, the !found logic below will be
	 * invoked and will scan. */
	if (!found && (mac->associnfo.scan_retry < IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT))
	{
		s8 rssi = -128;	/* if I don't initialise, gcc emits an invalid warning
				   because it cannot follow the best pointer logic. */
		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 just go with the reported rssi.
			 *
			 * 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;
					rssi = best->stats.rssi;
					continue;
				}
				/* we already had a matching network, so
				 * compare their properties to get the
				 * better of the two ... (see above)
				 */
				if (rssi < net->stats.rssi) {
					best = net;
					rssi = best->stats.rssi;
				}
			}
		}
		/* 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: Scanning for networks first.\n");
			ieee80211softmac_notify(mac->dev, IEEE80211SOFTMAC_EVENT_SCAN_FINISHED, ieee80211softmac_assoc_notify, NULL);
			if (ieee80211softmac_start_scan(mac))
				dprintk(KERN_INFO PFX "Associate: failed to initiate scan. Is device up?\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 matching 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);
	netif_carrier_on(mac->dev);
	
	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;
				schedule_work(&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;
	if (memcmp(disassoc->header.addr2, mac->associnfo.bssid, ETH_ALEN))
		return 0;
	if (memcmp(disassoc->header.addr1, mac->dev->dev_addr, ETH_ALEN))
		return 0;
	dprintk(KERN_INFO PFX "got disassoc frame\n");
	netif_carrier_off(dev);
	spin_lock_irqsave(&mac->lock, flags);
	mac->associnfo.bssvalid = 0;
	mac->associated = 0;
	schedule_work(&mac->associnfo.work);
	spin_unlock_irqrestore(&mac->lock, flags);
	
	return 0;
}
Commit	Line	Data
4855d25b JB	1	/*
	2	* This file contains the softmac's association logic.
	3	*
	4	* Copyright (c) 2005 Johannes Berg <johannes@sipsolutions.net>
	5	* Joseph Jezak <josejx@gentoo.org>
	6	* Larry Finger <Larry.Finger@lwfinger.net>
	7	* Danny van Dyk <kugelfang@gentoo.org>
	8	* Michael Buesch <mbuesch@freenet.de>
	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of version 2 of the GNU General Public License as
	12	* published by the Free Software Foundation.
	13	*
	14	* This program is distributed in the hope that it will be useful, but WITHOUT
	15	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	16	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	17	* more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	22	*
	23	* The full GNU General Public License is included in this distribution in the
	24	* file called COPYING.
	25	*/
	26
370121e5 JB	27	#include "ieee80211softmac_priv.h"
	28
	29	/*
	30	* Overview
	31	*
	32	* Before you can associate, you have to authenticate.
	33	*
	34	*/
	35
	36	/* Sends out an association request to the desired AP */
	37	static void
	38	ieee80211softmac_assoc(struct ieee80211softmac_device mac, struct ieee80211softmac_network net)
	39	{
	40	unsigned long flags;
	41	function_enter();
	42	/* Switch to correct channel for this network */
	43	mac->set_channel(mac->dev, net->channel);
	44
	45	/* Send association request */
	46	ieee80211softmac_send_mgt_frame(mac, net, IEEE80211_STYPE_ASSOC_REQ, 0);
	47
	48	dprintk(KERN_INFO PFX "sent association request!\n");
	49
	50	/* Change the state to associating */
	51	spin_lock_irqsave(&mac->lock, flags);
	52	mac->associnfo.associating = 1;
	53	mac->associated = 0; /* just to make sure */
	54	spin_unlock_irqrestore(&mac->lock, flags);
	55
	56	/* Set a timer for timeout */
	57	/* FIXME: make timeout configurable */
5c4df6da	58	schedule_delayed_work(&mac->associnfo.timeout, 5 * HZ);
370121e5 JB	59	}
	60
	61	void
	62	ieee80211softmac_assoc_timeout(void *d)
	63	{
	64	struct ieee80211softmac_device mac = (struct ieee80211softmac_device )d;
	65	unsigned long flags;
	66
	67	function_enter();
	68
	69	spin_lock_irqsave(&mac->lock, flags);
	70	/* we might race against ieee80211softmac_handle_assoc_response,
	71	* so make sure only one of us does something */
	72	if (!mac->associnfo.associating) {
	73	spin_unlock_irqrestore(&mac->lock, flags);
	74	return;
	75	}
	76	mac->associnfo.associating = 0;
	77	mac->associnfo.bssvalid = 0;
	78	mac->associated = 0;
	79	spin_unlock_irqrestore(&mac->lock, flags);
	80
	81	dprintk(KERN_INFO PFX "assoc request timed out!\n");
	82	/* FIXME: we need to know the network here. that requires a bit of restructuring */
	83	ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_TIMEOUT, NULL);
	84	}
	85
	86	static void
	87	ieee80211softmac_reassoc(struct ieee80211softmac_device *mac)
	88	{
	89	function_enter();
	90	}
	91
	92
	93	/* Sends out a disassociation request to the desired AP */
	94	static void
	95	ieee80211softmac_disassoc(struct ieee80211softmac_device *mac, u16 reason)
	96	{
	97	unsigned long flags;
	98	struct ieee80211softmac_network *found;
	99	function_enter();
	100
	101	if (mac->associnfo.bssvalid && mac->associated) {
	102	found = ieee80211softmac_get_network_by_bssid(mac, mac->associnfo.bssid);
	103	if (found)
	104	ieee80211softmac_send_mgt_frame(mac, found, IEEE80211_STYPE_DISASSOC, reason);
	105	} else if (mac->associnfo.associating) {
	106	cancel_delayed_work(&mac->associnfo.timeout);
	107	}
	108
	109	/* Change our state */
	110	spin_lock_irqsave(&mac->lock, flags);
	111	/* Do NOT clear bssvalid as that will break ieee80211softmac_assoc_work! */
	112	mac->associated = 0;
	113	mac->associnfo.associating = 0;
	114	spin_unlock_irqrestore(&mac->lock, flags);
	115	}
	116
	117	static inline int
	118	we_support_all_basic_rates(struct ieee80211softmac_device mac, u8 from, u8 from_len)
	119	{
	120	int idx, search, found;
	121	u8 rate, search_rate;
	122
123	for (idx = 0; idx < (from_len); idx++) {
124	rate = (from)[idx];
125	if (!(rate & IEEE80211_BASIC_RATE_MASK))
126	continue;
127	found = 0;
128	rate &= ~IEEE80211_BASIC_RATE_MASK;
129	for (search = 0; search < mac->ratesinfo.count; search++) {
130	search_rate = mac->ratesinfo.rates[search];
131	search_rate &= ~IEEE80211_BASIC_RATE_MASK;
132	if (rate == search_rate) {
133	found = 1;
134	break;
135	}
136	}
137	if (!found)
138	return 0;
139	}
140	return 1;
141	}
142
143	static int
144	network_matches_request(struct ieee80211softmac_device mac, struct ieee80211_network net)
145	{
146	/* we cannot associate to networks whose name we don't know */
147	if (ieee80211_is_empty_essid(net->ssid, net->ssid_len))
148	return 0;
149	/* do not associate to a network whose BSSBasicRateSet we cannot support */
150	if (!we_support_all_basic_rates(mac, net->rates, net->rates_len))
151	return 0;
152	/* do we really need to check the ex rates? */
153	if (!we_support_all_basic_rates(mac, net->rates_ex, net->rates_ex_len))
154	return 0;
155
156	/* if 'ANY' network requested, take any that doesn't have privacy enabled */
157	if (mac->associnfo.req_essid.len == 0
158	&& !(net->capability & WLAN_CAPABILITY_PRIVACY))
159	return 1;
160	if (net->ssid_len != mac->associnfo.req_essid.len)
161	return 0;
162	if (!memcmp(net->ssid, mac->associnfo.req_essid.data, mac->associnfo.req_essid.len))
163	return 1;
164	return 0;
165	}
166
167	static void
168	ieee80211softmac_assoc_notify(struct net_device dev, void context)
169	{
170	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
171	ieee80211softmac_assoc_work((void*)mac);
172	}
173
174	/* This function is called to handle userspace requests (asynchronously) */
175	void
176	ieee80211softmac_assoc_work(void *d)
177	{
178	struct ieee80211softmac_device mac = (struct ieee80211softmac_device )d;
179	struct ieee80211softmac_network *found = NULL;
180	struct ieee80211_network net = NULL, best = NULL;
181	unsigned long flags;
182
183	function_enter();
184
185	/* meh */
186	if (mac->associated)
187	ieee80211softmac_disassoc(mac, WLAN_REASON_DISASSOC_STA_HAS_LEFT);
188
189	/* try to find the requested network in our list, if we found one already */
190	if (mac->associnfo.bssvalid)
191	found = ieee80211softmac_get_network_by_bssid(mac, mac->associnfo.bssid);
192
1dc09776 JB	193	/* Search the ieee80211 networks for this network if we didn't find it by bssid,
	194	* but only if we've scanned at least once (to get a better list of networks to
	195	* select from). If we have not scanned before, the !found logic below will be
	196	* invoked and will scan. */
	197	if (!found && (mac->associnfo.scan_retry < IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT))
370121e5	198	{
78e4f36e JB	199	s8 rssi = -128; /* if I don't initialise, gcc emits an invalid warning
78e4f36e JB	200	because it cannot follow the best pointer logic. */
370121e5 JB	201	spin_lock_irqsave(&mac->ieee->lock, flags);
	202	list_for_each_entry(net, &mac->ieee->network_list, list) {
	203	/* we're supposed to find the network with
	204	* the best signal here, as we're asked to join
	205	* any network with a specific ESSID, and many
	206	* different ones could have that.
	207	*
78e4f36e	208	* I'll for now just go with the reported rssi.
370121e5 JB	209	*
	210	* We also should take into account the rateset
	211	* here to find the best BSSID to try.
	212	*/
	213	if (network_matches_request(mac, net)) {
	214	if (!best) {
	215	best = net;
78e4f36e	216	rssi = best->stats.rssi;
370121e5 JB	217	continue;
	218	}
	219	/* we already had a matching network, so
	220	* compare their properties to get the
	221	* better of the two ... (see above)
	222	*/
78e4f36e JB	223	if (rssi < net->stats.rssi) {
	224	best = net;
	225	rssi = best->stats.rssi;
	226	}
370121e5 JB	227	}
	228	}
	229	/* if we unlock here, we might get interrupted and the `best'
	230	* pointer could go stale */
	231	if (best) {
	232	found = ieee80211softmac_create_network(mac, best);
	233	/* if found is still NULL, then we got -ENOMEM somewhere */
	234	if (found)
	235	ieee80211softmac_add_network(mac, found);
	236	}
	237	spin_unlock_irqrestore(&mac->ieee->lock, flags);
	238	}
	239
	240	if (!found) {
	241	if (mac->associnfo.scan_retry > 0) {
	242	spin_lock_irqsave(&mac->lock, flags);
	243	mac->associnfo.scan_retry--;
	244	spin_unlock_irqrestore(&mac->lock, flags);
	245
	246	/* We know of no such network. Let's scan.
	247	* NB: this also happens if we had no memory to copy the network info...
	248	* Maybe we can hope to have more memory after scanning finishes ;)
	249	*/
1dc09776	250	dprintk(KERN_INFO PFX "Associate: Scanning for networks first.\n");
370121e5 JB	251	ieee80211softmac_notify(mac->dev, IEEE80211SOFTMAC_EVENT_SCAN_FINISHED, ieee80211softmac_assoc_notify, NULL);
370121e5 JB	252	if (ieee80211softmac_start_scan(mac))
1dc09776	253	dprintk(KERN_INFO PFX "Associate: failed to initiate scan. Is device up?\n");
370121e5 JB	254	return;
	255	}
	256	else {
	257	spin_lock_irqsave(&mac->lock, flags);
	258	mac->associnfo.associating = 0;
	259	mac->associated = 0;
	260	spin_unlock_irqrestore(&mac->lock, flags);
	261
1dc09776	262	dprintk(KERN_INFO PFX "Unable to find matching network after scan!\n");
370121e5 JB	263	ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_NET_NOT_FOUND, NULL);
	264	return;
	265	}
	266	}
	267
	268	mac->associnfo.bssvalid = 1;
	269	memcpy(mac->associnfo.bssid, found->bssid, ETH_ALEN);
	270	/* copy the ESSID for displaying it */
	271	mac->associnfo.associate_essid.len = found->essid.len;
	272	memcpy(mac->associnfo.associate_essid.data, found->essid.data, IW_ESSID_MAX_SIZE + 1);
	273
	274	/* we found a network! authenticate (if necessary) and associate to it. */
	275	if (!found->authenticated) {
	276	/* This relies on the fact that _auth_req only queues the work,
	277	* otherwise adding the notification would be racy. */
	278	if (!ieee80211softmac_auth_req(mac, found)) {
	279	dprintk(KERN_INFO PFX "cannot associate without being authenticated, requested authentication\n");
	280	ieee80211softmac_notify_internal(mac, IEEE80211SOFTMAC_EVENT_ANY, found, ieee80211softmac_assoc_notify, NULL, GFP_KERNEL);
	281	} else {
	282	printkl(KERN_WARNING PFX "Not authenticated, but requesting authentication failed. Giving up to associate\n");
	283	ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED, found);
	284	}
	285	return;
	286	}
	287	/* finally! now we can start associating */
	288	ieee80211softmac_assoc(mac, found);
	289	}
	290
	291	/* call this to do whatever is necessary when we're associated */
	292	static void
	293	ieee80211softmac_associated(struct ieee80211softmac_device *mac,
	294	struct ieee80211_assoc_response * resp,
	295	struct ieee80211softmac_network *net)
	296	{
	297	mac->associnfo.associating = 0;
	298	mac->associated = 1;
	299	if (mac->set_bssid_filter)
	300	mac->set_bssid_filter(mac->dev, net->bssid);
	301	memcpy(mac->ieee->bssid, net->bssid, ETH_ALEN);
2dd50801	302	netif_carrier_on(mac->dev);
370121e5 JB	303
	304	mac->association_id = le16_to_cpup(&resp->aid);
	305	}
	306
	307	/* received frame handling functions */
	308	int
	309	ieee80211softmac_handle_assoc_response(struct net_device * dev,
	310	struct ieee80211_assoc_response * resp,
	311	struct ieee80211_network * _ieee80211_network_do_not_use)
	312	{
	313	/* NOTE: the network parameter has to be ignored by
	314	* this code because it is the ieee80211's pointer
	315	* to the struct, not ours (we made a copy)
	316	*/
	317	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
	318	u16 status = le16_to_cpup(&resp->status);
	319	struct ieee80211softmac_network *network = NULL;
	320	unsigned long flags;
	321
	322	spin_lock_irqsave(&mac->lock, flags);
	323
	324	if (!mac->associnfo.associating) {
	325	/* we race against the timeout function, so make sure
	326	* only one of us can do work */
	327	spin_unlock_irqrestore(&mac->lock, flags);
	328	return 0;
	329	}
	330	network = ieee80211softmac_get_network_by_bssid_locked(mac, resp->header.addr3);
	331
	332	/* someone sending us things without us knowing him? Ignore. */
	333	if (!network) {
	334	dprintk(KERN_INFO PFX "Received unrequested assocation response from " MAC_FMT "\n", MAC_ARG(resp->header.addr3));
	335	spin_unlock_irqrestore(&mac->lock, flags);
	336	return 0;
	337	}
	338
	339	/* now that we know it was for us, we can cancel the timeout */
	340	cancel_delayed_work(&mac->associnfo.timeout);
	341
	342	switch (status) {
	343	case 0:
	344	dprintk(KERN_INFO PFX "associated!\n");
	345	ieee80211softmac_associated(mac, resp, network);
	346	ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATED, network);
	347	break;
	348	case WLAN_REASON_STA_REQ_ASSOC_WITHOUT_AUTH:
	349	if (!network->auth_desynced_once) {
	350	/* there seem to be a few rare cases where our view of
	351	* the world is obscured, or buggy APs that don't DEAUTH
	352	* us properly. So we handle that, but allow it only once.
	353	*/
	354	printkl(KERN_INFO PFX "We were not authenticated during association, retrying...\n");
	355	network->authenticated = 0;
	356	/* we don't want to do this more than once ... */
	357	network->auth_desynced_once = 1;
5c4df6da	358	schedule_work(&mac->associnfo.work);
370121e5 JB	359	break;
	360	}
	361	default:
	362	dprintk(KERN_INFO PFX "associating failed (reason: 0x%x)!\n", status);
	363	mac->associnfo.associating = 0;
	364	mac->associnfo.bssvalid = 0;
	365	mac->associated = 0;
	366	ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED, network);
	367	}
	368
	369	spin_unlock_irqrestore(&mac->lock, flags);
	370	return 0;
	371	}
	372
	373	int
	374	ieee80211softmac_handle_disassoc(struct net_device * dev,
	375	struct ieee80211_disassoc *disassoc)
	376	{
	377	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
	378	unsigned long flags;
48b2e4ce JB	379	if (memcmp(disassoc->header.addr2, mac->associnfo.bssid, ETH_ALEN))
	380	return 0;
	381	if (memcmp(disassoc->header.addr1, mac->dev->dev_addr, ETH_ALEN))
	382	return 0;
370121e5	383	dprintk(KERN_INFO PFX "got disassoc frame\n");
2dd50801	384	netif_carrier_off(dev);
370121e5 JB	385	spin_lock_irqsave(&mac->lock, flags);
	386	mac->associnfo.bssvalid = 0;
	387	mac->associated = 0;
d1469cf2	388	schedule_work(&mac->associnfo.work);
370121e5 JB	389	spin_unlock_irqrestore(&mac->lock, flags);
	390
	391	return 0;
	392	}