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

/*
 * This file contains the softmac's association logic.
 *
 * Copyright (c) 2005, 2006 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;

	/* 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");

	spin_lock_irqsave(&mac->lock, flags);
	mac->associated = 0; /* just to make sure */

	/* Set a timer for timeout */
	/* FIXME: make timeout configurable */
	if (likely(mac->running))
		schedule_delayed_work(&mac->associnfo.timeout, 5 * HZ);
	spin_unlock_irqrestore(&mac->lock, flags);
}

void
ieee80211softmac_assoc_timeout(void *d)
{
	struct ieee80211softmac_device *mac = (struct ieee80211softmac_device *)d;
	struct ieee80211softmac_network *n;
	unsigned long flags;

	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;

	n = ieee80211softmac_get_network_by_bssid_locked(mac, mac->associnfo.bssid);
	spin_unlock_irqrestore(&mac->lock, flags);

	dprintk(KERN_INFO PFX "assoc request timed out!\n");
	ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_TIMEOUT, n);
}

void
ieee80211softmac_disassoc(struct ieee80211softmac_device *mac)
{
	unsigned long flags;

	spin_lock_irqsave(&mac->lock, flags);
	if (mac->associnfo.associating)
		cancel_delayed_work(&mac->associnfo.timeout);

	netif_carrier_off(mac->dev);

	mac->associated = 0;
	mac->associnfo.bssvalid = 0;
	mac->associnfo.associating = 0;
	ieee80211softmac_init_txrates(mac);
	ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_DISASSOCIATED, NULL);
	spin_unlock_irqrestore(&mac->lock, flags);
}

/* Sends out a disassociation request to the desired AP */
void
ieee80211softmac_send_disassoc_req(struct ieee80211softmac_device *mac, u16 reason)
{
	struct ieee80211softmac_network *found;

	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);
	}

	ieee80211softmac_disassoc(mac);
}

static inline int
we_support_all_basic_rates(struct ieee80211softmac_device *mac, u8 *from, u8 from_len)
{
	int idx;
	u8 rate;

	for (idx = 0; idx < (from_len); idx++) {
		rate = (from)[idx];
		if (!(rate & IEEE80211_BASIC_RATE_MASK))
			continue;
		rate &= ~IEEE80211_BASIC_RATE_MASK;
		if (!ieee80211softmac_ratesinfo_rate_supported(&mac->ratesinfo, rate))
			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;

	/* assume that users know what they're doing ...
	 * (note we don't let them select a net we're incompatible with) */
	if (mac->associnfo.bssfixed) {
		return !memcmp(mac->associnfo.bssid, net->bssid, ETH_ALEN);
	}

	/* 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_scan(struct net_device *dev, int event_type, void *context)
{
	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
	ieee80211softmac_assoc_work((void*)mac);
}

static void
ieee80211softmac_assoc_notify_auth(struct net_device *dev, int event_type, void *context)
{
	struct ieee80211softmac_device *mac = ieee80211_priv(dev);

	switch (event_type) {
	case IEEE80211SOFTMAC_EVENT_AUTHENTICATED:
		ieee80211softmac_assoc_work((void*)mac);
		break;
	case IEEE80211SOFTMAC_EVENT_AUTH_FAILED:
	case IEEE80211SOFTMAC_EVENT_AUTH_TIMEOUT:
		ieee80211softmac_disassoc(mac);
		break;
	}
}

/* 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;
	int bssvalid;
	unsigned long flags;

	/* ieee80211_disassoc might clear this */
	bssvalid = mac->associnfo.bssvalid;

	/* meh */
	if (mac->associated)
		ieee80211softmac_send_disassoc_req(mac, WLAN_REASON_DISASSOC_STA_HAS_LEFT);

	spin_lock_irqsave(&mac->lock, flags);
	mac->associnfo.associating = 1;
	spin_unlock_irqrestore(&mac->lock, flags);

	/* try to find the requested network in our list, if we found one already */
	if (bssvalid || mac->associnfo.bssfixed)
		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_scan, 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");
			/* reset the retry counter for the next user request since we
			 * break out and don't reschedule ourselves after this point. */
			mac->associnfo.scan_retry = IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT;
			ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_NET_NOT_FOUND, NULL);
			return;
		}
	}

	/* reset the retry counter for the next user request since we
	 * now found a net and will try to associate to it, but not
	 * schedule this function again. */
	mac->associnfo.scan_retry = IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT;
	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->authenticating) {
		dprintk(KERN_INFO PFX "Already requested authentication, waiting...\n");
		if(!mac->associnfo.assoc_wait) {
			mac->associnfo.assoc_wait = 1;
			ieee80211softmac_notify_internal(mac, IEEE80211SOFTMAC_EVENT_ANY, found, ieee80211softmac_assoc_notify, NULL, GFP_KERNEL);
		}
		return;
	}
	if (!found->authenticated && !found->authenticating) {
		/* 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)) {
			if(!mac->associnfo.assoc_wait) {
				dprintk(KERN_INFO PFX "Cannot associate without being authenticated, requested authentication\n");
				mac->associnfo.assoc_wait = 1;
				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");
			mac->associnfo.assoc_wait = 0;
			ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED, found);
		}
		return;
	}
	/* finally! now we can start associating */
	mac->associnfo.assoc_wait = 0;
	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->associnfo.supported_rates = net->supported_rates;
	ieee80211softmac_recalc_txrates(mac);

	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;

	if (unlikely(!mac->running))
		return -ENODEV;
	
	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);

	if (unlikely(!mac->running))
		return -ENODEV;

	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");
	ieee80211softmac_disassoc(mac);

	/* try to reassociate */
	schedule_work(&mac->associnfo.work);

	return 0;
}

int
ieee80211softmac_handle_reassoc_req(struct net_device * dev,
				    struct ieee80211_reassoc_request * resp)
{
	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
	struct ieee80211softmac_network *network;

	if (unlikely(!mac->running))
		return -ENODEV;

	network = ieee80211softmac_get_network_by_bssid(mac, resp->header.addr3);
	if (!network) {
		dprintkl(KERN_INFO PFX "reassoc request from unknown network\n");
		return 0;
	}
	schedule_work(&mac->associnfo.work);

	return 0;
}
Commit	Line	Data
4855d25b JB	1	/*
	2	* This file contains the softmac's association logic.
	3	*
79859051 JB	4	* Copyright (c) 2005, 2006 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>
4855d25b JB	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;
9a107aa2	41
370121e5 JB	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
370121e5	50	spin_lock_irqsave(&mac->lock, flags);
370121e5	51	mac->associated = 0; /* just to make sure */
370121e5 JB	52
	53	/* Set a timer for timeout */
	54	/* FIXME: make timeout configurable */
d57336e3 DD	55	if (likely(mac->running))
	56	schedule_delayed_work(&mac->associnfo.timeout, 5 * HZ);
	57	spin_unlock_irqrestore(&mac->lock, flags);
370121e5 JB	58	}
	59
	60	void
	61	ieee80211softmac_assoc_timeout(void *d)
	62	{
	63	struct ieee80211softmac_device mac = (struct ieee80211softmac_device )d;
9f101fc5	64	struct ieee80211softmac_network *n;
370121e5 JB	65	unsigned long flags;
370121e5 JB	66
370121e5 JB	67	spin_lock_irqsave(&mac->lock, flags);
	68	/* we might race against ieee80211softmac_handle_assoc_response,
	69	* so make sure only one of us does something */
	70	if (!mac->associnfo.associating) {
	71	spin_unlock_irqrestore(&mac->lock, flags);
	72	return;
	73	}
	74	mac->associnfo.associating = 0;
	75	mac->associnfo.bssvalid = 0;
	76	mac->associated = 0;
9f101fc5 JJ	77
9f101fc5 JJ	78	n = ieee80211softmac_get_network_by_bssid_locked(mac, mac->associnfo.bssid);
370121e5 JB	79	spin_unlock_irqrestore(&mac->lock, flags);
	80
	81	dprintk(KERN_INFO PFX "assoc request timed out!\n");
9f101fc5	82	ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_TIMEOUT, n);
370121e5 JB	83	}
370121e5 JB	84
9a1771e8	85	void
6d92f83f	86	ieee80211softmac_disassoc(struct ieee80211softmac_device *mac)
370121e5 JB	87	{
370121e5 JB	88	unsigned long flags;
6d92f83f DD	89
	90	spin_lock_irqsave(&mac->lock, flags);
	91	if (mac->associnfo.associating)
	92	cancel_delayed_work(&mac->associnfo.timeout);
	93
	94	netif_carrier_off(mac->dev);
	95
	96	mac->associated = 0;
	97	mac->associnfo.bssvalid = 0;
	98	mac->associnfo.associating = 0;
8462fe3c	99	ieee80211softmac_init_txrates(mac);
6d92f83f DD	100	ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_DISASSOCIATED, NULL);
	101	spin_unlock_irqrestore(&mac->lock, flags);
	102	}
	103
	104	/* Sends out a disassociation request to the desired AP */
	105	void
	106	ieee80211softmac_send_disassoc_req(struct ieee80211softmac_device *mac, u16 reason)
	107	{
370121e5	108	struct ieee80211softmac_network *found;
370121e5 JB	109
	110	if (mac->associnfo.bssvalid && mac->associated) {
	111	found = ieee80211softmac_get_network_by_bssid(mac, mac->associnfo.bssid);
	112	if (found)
	113	ieee80211softmac_send_mgt_frame(mac, found, IEEE80211_STYPE_DISASSOC, reason);
370121e5 JB	114	}
370121e5 JB	115
6d92f83f	116	ieee80211softmac_disassoc(mac);
370121e5 JB	117	}
	118
	119	static inline int
	120	we_support_all_basic_rates(struct ieee80211softmac_device mac, u8 from, u8 from_len)
	121	{
8462fe3c DD	122	int idx;
8462fe3c DD	123	u8 rate;
370121e5 JB	124
	125	for (idx = 0; idx < (from_len); idx++) {
	126	rate = (from)[idx];
	127	if (!(rate & IEEE80211_BASIC_RATE_MASK))
	128	continue;
370121e5	129	rate &= ~IEEE80211_BASIC_RATE_MASK;
8462fe3c	130	if (!ieee80211softmac_ratesinfo_rate_supported(&mac->ratesinfo, rate))
370121e5 JB	131	return 0;
	132	}
	133	return 1;
	134	}
	135
	136	static int
	137	network_matches_request(struct ieee80211softmac_device mac, struct ieee80211_network net)
	138	{
	139	/* we cannot associate to networks whose name we don't know */
	140	if (ieee80211_is_empty_essid(net->ssid, net->ssid_len))
	141	return 0;
	142	/* do not associate to a network whose BSSBasicRateSet we cannot support */
	143	if (!we_support_all_basic_rates(mac, net->rates, net->rates_len))
	144	return 0;
	145	/* do we really need to check the ex rates? */
	146	if (!we_support_all_basic_rates(mac, net->rates_ex, net->rates_ex_len))
	147	return 0;
	148
818667f7 JB	149	/* assume that users know what they're doing ...
	150	* (note we don't let them select a net we're incompatible with) */
	151	if (mac->associnfo.bssfixed) {
	152	return !memcmp(mac->associnfo.bssid, net->bssid, ETH_ALEN);
	153	}
	154
370121e5 JB	155	/* if 'ANY' network requested, take any that doesn't have privacy enabled */
	156	if (mac->associnfo.req_essid.len == 0
	157	&& !(net->capability & WLAN_CAPABILITY_PRIVACY))
	158	return 1;
	159	if (net->ssid_len != mac->associnfo.req_essid.len)
	160	return 0;
	161	if (!memcmp(net->ssid, mac->associnfo.req_essid.data, mac->associnfo.req_essid.len))
	162	return 1;
	163	return 0;
	164	}
	165
	166	static void
6ae15df1	167	ieee80211softmac_assoc_notify_scan(struct net_device dev, int event_type, void context)
370121e5 JB	168	{
	169	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
	170	ieee80211softmac_assoc_work((void*)mac);
	171	}
	172
6ae15df1 DD	173	static void
	174	ieee80211softmac_assoc_notify_auth(struct net_device dev, int event_type, void context)
	175	{
	176	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
	177
	178	switch (event_type) {
	179	case IEEE80211SOFTMAC_EVENT_AUTHENTICATED:
	180	ieee80211softmac_assoc_work((void*)mac);
	181	break;
	182	case IEEE80211SOFTMAC_EVENT_AUTH_FAILED:
	183	case IEEE80211SOFTMAC_EVENT_AUTH_TIMEOUT:
	184	ieee80211softmac_disassoc(mac);
	185	break;
	186	}
	187	}
	188
370121e5 JB	189	/* This function is called to handle userspace requests (asynchronously) */
	190	void
	191	ieee80211softmac_assoc_work(void *d)
	192	{
	193	struct ieee80211softmac_device mac = (struct ieee80211softmac_device )d;
	194	struct ieee80211softmac_network *found = NULL;
	195	struct ieee80211_network net = NULL, best = NULL;
6d92f83f	196	int bssvalid;
370121e5	197	unsigned long flags;
6d92f83f DD	198
	199	/* ieee80211_disassoc might clear this */
	200	bssvalid = mac->associnfo.bssvalid;
	201
370121e5 JB	202	/* meh */
370121e5 JB	203	if (mac->associated)
6d92f83f	204	ieee80211softmac_send_disassoc_req(mac, WLAN_REASON_DISASSOC_STA_HAS_LEFT);
370121e5	205
cb74c432 JJ	206	spin_lock_irqsave(&mac->lock, flags);
	207	mac->associnfo.associating = 1;
	208	spin_unlock_irqrestore(&mac->lock, flags);
	209
370121e5	210	/* try to find the requested network in our list, if we found one already */
6d92f83f	211	if (bssvalid \|\| mac->associnfo.bssfixed)
370121e5 JB	212	found = ieee80211softmac_get_network_by_bssid(mac, mac->associnfo.bssid);
370121e5 JB	213
1dc09776 JB	214	/* Search the ieee80211 networks for this network if we didn't find it by bssid,
	215	* but only if we've scanned at least once (to get a better list of networks to
	216	* select from). If we have not scanned before, the !found logic below will be
	217	* invoked and will scan. */
	218	if (!found && (mac->associnfo.scan_retry < IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT))
370121e5	219	{
78e4f36e JB	220	s8 rssi = -128; /* if I don't initialise, gcc emits an invalid warning
78e4f36e JB	221	because it cannot follow the best pointer logic. */
370121e5 JB	222	spin_lock_irqsave(&mac->ieee->lock, flags);
	223	list_for_each_entry(net, &mac->ieee->network_list, list) {
	224	/* we're supposed to find the network with
	225	* the best signal here, as we're asked to join
	226	* any network with a specific ESSID, and many
	227	* different ones could have that.
	228	*
78e4f36e	229	* I'll for now just go with the reported rssi.
370121e5 JB	230	*
	231	* We also should take into account the rateset
	232	* here to find the best BSSID to try.
	233	*/
	234	if (network_matches_request(mac, net)) {
	235	if (!best) {
	236	best = net;
78e4f36e	237	rssi = best->stats.rssi;
370121e5 JB	238	continue;
	239	}
	240	/* we already had a matching network, so
	241	* compare their properties to get the
	242	* better of the two ... (see above)
	243	*/
78e4f36e JB	244	if (rssi < net->stats.rssi) {
	245	best = net;
	246	rssi = best->stats.rssi;
	247	}
370121e5 JB	248	}
	249	}
	250	/* if we unlock here, we might get interrupted and the `best'
	251	* pointer could go stale */
	252	if (best) {
	253	found = ieee80211softmac_create_network(mac, best);
	254	/* if found is still NULL, then we got -ENOMEM somewhere */
	255	if (found)
	256	ieee80211softmac_add_network(mac, found);
	257	}
	258	spin_unlock_irqrestore(&mac->ieee->lock, flags);
	259	}
	260
	261	if (!found) {
	262	if (mac->associnfo.scan_retry > 0) {
	263	spin_lock_irqsave(&mac->lock, flags);
	264	mac->associnfo.scan_retry--;
	265	spin_unlock_irqrestore(&mac->lock, flags);
	266
	267	/* We know of no such network. Let's scan.
	268	* NB: this also happens if we had no memory to copy the network info...
	269	* Maybe we can hope to have more memory after scanning finishes ;)
	270	*/
1dc09776	271	dprintk(KERN_INFO PFX "Associate: Scanning for networks first.\n");
6ae15df1	272	ieee80211softmac_notify(mac->dev, IEEE80211SOFTMAC_EVENT_SCAN_FINISHED, ieee80211softmac_assoc_notify_scan, NULL);
370121e5	273	if (ieee80211softmac_start_scan(mac))
1dc09776	274	dprintk(KERN_INFO PFX "Associate: failed to initiate scan. Is device up?\n");
370121e5	275	return;
818667f7	276	} else {
370121e5 JB	277	spin_lock_irqsave(&mac->lock, flags);
	278	mac->associnfo.associating = 0;
	279	mac->associated = 0;
	280	spin_unlock_irqrestore(&mac->lock, flags);
	281
1dc09776	282	dprintk(KERN_INFO PFX "Unable to find matching network after scan!\n");
818667f7 JB	283	/* reset the retry counter for the next user request since we
	284	* break out and don't reschedule ourselves after this point. */
	285	mac->associnfo.scan_retry = IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT;
370121e5 JB	286	ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_NET_NOT_FOUND, NULL);
	287	return;
	288	}
	289	}
818667f7 JB	290
	291	/* reset the retry counter for the next user request since we
	292	* now found a net and will try to associate to it, but not
	293	* schedule this function again. */
	294	mac->associnfo.scan_retry = IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT;
370121e5 JB	295	mac->associnfo.bssvalid = 1;
	296	memcpy(mac->associnfo.bssid, found->bssid, ETH_ALEN);
	297	/* copy the ESSID for displaying it */
	298	mac->associnfo.associate_essid.len = found->essid.len;
	299	memcpy(mac->associnfo.associate_essid.data, found->essid.data, IW_ESSID_MAX_SIZE + 1);
	300
	301	/* we found a network! authenticate (if necessary) and associate to it. */
cb74c432 JJ	302	if (found->authenticating) {
	303	dprintk(KERN_INFO PFX "Already requested authentication, waiting...\n");
	304	if(!mac->associnfo.assoc_wait) {
	305	mac->associnfo.assoc_wait = 1;
	306	ieee80211softmac_notify_internal(mac, IEEE80211SOFTMAC_EVENT_ANY, found, ieee80211softmac_assoc_notify, NULL, GFP_KERNEL);
	307	}
	308	return;
	309	}
	310	if (!found->authenticated && !found->authenticating) {
370121e5 JB	311	/* This relies on the fact that _auth_req only queues the work,
	312	* otherwise adding the notification would be racy. */
	313	if (!ieee80211softmac_auth_req(mac, found)) {
cb74c432 JJ	314	if(!mac->associnfo.assoc_wait) {
	315	dprintk(KERN_INFO PFX "Cannot associate without being authenticated, requested authentication\n");
	316	mac->associnfo.assoc_wait = 1;
	317	ieee80211softmac_notify_internal(mac, IEEE80211SOFTMAC_EVENT_ANY, found, ieee80211softmac_assoc_notify, NULL, GFP_KERNEL);
	318	}
370121e5 JB	319	} else {
370121e5 JB	320	printkl(KERN_WARNING PFX "Not authenticated, but requesting authentication failed. Giving up to associate\n");
cb74c432	321	mac->associnfo.assoc_wait = 0;
370121e5 JB	322	ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED, found);
	323	}
	324	return;
	325	}
	326	/* finally! now we can start associating */
cb74c432	327	mac->associnfo.assoc_wait = 0;
370121e5 JB	328	ieee80211softmac_assoc(mac, found);
	329	}
	330
	331	/* call this to do whatever is necessary when we're associated */
	332	static void
	333	ieee80211softmac_associated(struct ieee80211softmac_device *mac,
	334	struct ieee80211_assoc_response * resp,
	335	struct ieee80211softmac_network *net)
	336	{
	337	mac->associnfo.associating = 0;
8462fe3c DD	338	mac->associnfo.supported_rates = net->supported_rates;
	339	ieee80211softmac_recalc_txrates(mac);
	340
370121e5 JB	341	mac->associated = 1;
	342	if (mac->set_bssid_filter)
	343	mac->set_bssid_filter(mac->dev, net->bssid);
	344	memcpy(mac->ieee->bssid, net->bssid, ETH_ALEN);
2dd50801	345	netif_carrier_on(mac->dev);
370121e5 JB	346
	347	mac->association_id = le16_to_cpup(&resp->aid);
	348	}
	349
	350	/* received frame handling functions */
	351	int
	352	ieee80211softmac_handle_assoc_response(struct net_device * dev,
	353	struct ieee80211_assoc_response * resp,
	354	struct ieee80211_network * _ieee80211_network_do_not_use)
	355	{
	356	/* NOTE: the network parameter has to be ignored by
	357	* this code because it is the ieee80211's pointer
	358	* to the struct, not ours (we made a copy)
	359	*/
	360	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
	361	u16 status = le16_to_cpup(&resp->status);
	362	struct ieee80211softmac_network *network = NULL;
	363	unsigned long flags;
d57336e3 DD	364
	365	if (unlikely(!mac->running))
	366	return -ENODEV;
370121e5 JB	367
	368	spin_lock_irqsave(&mac->lock, flags);
	369
	370	if (!mac->associnfo.associating) {
	371	/* we race against the timeout function, so make sure
	372	* only one of us can do work */
	373	spin_unlock_irqrestore(&mac->lock, flags);
	374	return 0;
	375	}
	376	network = ieee80211softmac_get_network_by_bssid_locked(mac, resp->header.addr3);
	377
	378	/* someone sending us things without us knowing him? Ignore. */
	379	if (!network) {
	380	dprintk(KERN_INFO PFX "Received unrequested assocation response from " MAC_FMT "\n", MAC_ARG(resp->header.addr3));
	381	spin_unlock_irqrestore(&mac->lock, flags);
	382	return 0;
	383	}
	384
	385	/* now that we know it was for us, we can cancel the timeout */
	386	cancel_delayed_work(&mac->associnfo.timeout);
	387
	388	switch (status) {
	389	case 0:
	390	dprintk(KERN_INFO PFX "associated!\n");
	391	ieee80211softmac_associated(mac, resp, network);
	392	ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATED, network);
	393	break;
	394	case WLAN_REASON_STA_REQ_ASSOC_WITHOUT_AUTH:
	395	if (!network->auth_desynced_once) {
	396	/* there seem to be a few rare cases where our view of
	397	* the world is obscured, or buggy APs that don't DEAUTH
	398	* us properly. So we handle that, but allow it only once.
	399	*/
	400	printkl(KERN_INFO PFX "We were not authenticated during association, retrying...\n");
	401	network->authenticated = 0;
	402	/* we don't want to do this more than once ... */
	403	network->auth_desynced_once = 1;
5c4df6da	404	schedule_work(&mac->associnfo.work);
370121e5 JB	405	break;
	406	}
	407	default:
	408	dprintk(KERN_INFO PFX "associating failed (reason: 0x%x)!\n", status);
	409	mac->associnfo.associating = 0;
	410	mac->associnfo.bssvalid = 0;
	411	mac->associated = 0;
	412	ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED, network);
	413	}
	414
	415	spin_unlock_irqrestore(&mac->lock, flags);
	416	return 0;
	417	}
	418
	419	int
	420	ieee80211softmac_handle_disassoc(struct net_device * dev,
	421	struct ieee80211_disassoc *disassoc)
	422	{
	423	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
d57336e3 DD	424
	425	if (unlikely(!mac->running))
	426	return -ENODEV;
	427
48b2e4ce JB	428	if (memcmp(disassoc->header.addr2, mac->associnfo.bssid, ETH_ALEN))
48b2e4ce JB	429	return 0;
d57336e3	430
48b2e4ce JB	431	if (memcmp(disassoc->header.addr1, mac->dev->dev_addr, ETH_ALEN))
48b2e4ce JB	432	return 0;
d57336e3	433
370121e5	434	dprintk(KERN_INFO PFX "got disassoc frame\n");
6d92f83f DD	435	ieee80211softmac_disassoc(mac);
	436
	437	/* try to reassociate */
d1469cf2	438	schedule_work(&mac->associnfo.work);
6d92f83f	439
370121e5 JB	440	return 0;
370121e5 JB	441	}
b6c7658e JB	442
	443	int
	444	ieee80211softmac_handle_reassoc_req(struct net_device * dev,
	445	struct ieee80211_reassoc_request * resp)
	446	{
	447	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
	448	struct ieee80211softmac_network *network;
	449
d57336e3 DD	450	if (unlikely(!mac->running))
	451	return -ENODEV;
	452
b6c7658e JB	453	network = ieee80211softmac_get_network_by_bssid(mac, resp->header.addr3);
	454	if (!network) {
	455	dprintkl(KERN_INFO PFX "reassoc request from unknown network\n");
	456	return 0;
	457	}
9b0b4d8a MB	458	schedule_work(&mac->associnfo.work);
9b0b4d8a MB	459
b6c7658e JB	460	return 0;
b6c7658e JB	461	}