[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");

	/* Change the state to associating */
	spin_lock_irqsave(&mac->lock, flags);
	mac->associnfo.associating = 1;
	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;
	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;
	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);
}

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(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;
	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);

	/* 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, 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->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->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
	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 */
370121e5 JB	54
	55	/* Set a timer for timeout */
	56	/* FIXME: make timeout configurable */
d57336e3 DD	57	if (likely(mac->running))
	58	schedule_delayed_work(&mac->associnfo.timeout, 5 * HZ);
	59	spin_unlock_irqrestore(&mac->lock, flags);
370121e5 JB	60	}
	61
	62	void
	63	ieee80211softmac_assoc_timeout(void *d)
	64	{
	65	struct ieee80211softmac_device mac = (struct ieee80211softmac_device )d;
	66	unsigned long flags;
	67
370121e5 JB	68	spin_lock_irqsave(&mac->lock, flags);
	69	/* we might race against ieee80211softmac_handle_assoc_response,
	70	* so make sure only one of us does something */
	71	if (!mac->associnfo.associating) {
	72	spin_unlock_irqrestore(&mac->lock, flags);
	73	return;
	74	}
	75	mac->associnfo.associating = 0;
	76	mac->associnfo.bssvalid = 0;
	77	mac->associated = 0;
	78	spin_unlock_irqrestore(&mac->lock, flags);
	79
	80	dprintk(KERN_INFO PFX "assoc request timed out!\n");
	81	/* FIXME: we need to know the network here. that requires a bit of restructuring */
	82	ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_TIMEOUT, NULL);
	83	}
	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
	167	ieee80211softmac_assoc_notify(struct net_device dev, void context)
	168	{
	169	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
	170	ieee80211softmac_assoc_work((void*)mac);
	171	}
	172
	173	/* This function is called to handle userspace requests (asynchronously) */
	174	void
	175	ieee80211softmac_assoc_work(void *d)
	176	{
	177	struct ieee80211softmac_device mac = (struct ieee80211softmac_device )d;
	178	struct ieee80211softmac_network *found = NULL;
	179	struct ieee80211_network net = NULL, best = NULL;
6d92f83f	180	int bssvalid;
370121e5	181	unsigned long flags;
6d92f83f DD	182
	183	/* ieee80211_disassoc might clear this */
	184	bssvalid = mac->associnfo.bssvalid;
	185
370121e5 JB	186	/* meh */
370121e5 JB	187	if (mac->associated)
6d92f83f	188	ieee80211softmac_send_disassoc_req(mac, WLAN_REASON_DISASSOC_STA_HAS_LEFT);
370121e5 JB	189
370121e5 JB	190	/* try to find the requested network in our list, if we found one already */
6d92f83f	191	if (bssvalid \|\| mac->associnfo.bssfixed)
370121e5 JB	192	found = ieee80211softmac_get_network_by_bssid(mac, mac->associnfo.bssid);
370121e5 JB	193
1dc09776 JB	194	/* Search the ieee80211 networks for this network if we didn't find it by bssid,
	195	* but only if we've scanned at least once (to get a better list of networks to
	196	* select from). If we have not scanned before, the !found logic below will be
	197	* invoked and will scan. */
	198	if (!found && (mac->associnfo.scan_retry < IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT))
370121e5	199	{
78e4f36e JB	200	s8 rssi = -128; /* if I don't initialise, gcc emits an invalid warning
78e4f36e JB	201	because it cannot follow the best pointer logic. */
370121e5 JB	202	spin_lock_irqsave(&mac->ieee->lock, flags);
	203	list_for_each_entry(net, &mac->ieee->network_list, list) {
	204	/* we're supposed to find the network with
	205	* the best signal here, as we're asked to join
	206	* any network with a specific ESSID, and many
	207	* different ones could have that.
	208	*
78e4f36e	209	* I'll for now just go with the reported rssi.
370121e5 JB	210	*
	211	* We also should take into account the rateset
	212	* here to find the best BSSID to try.
	213	*/
	214	if (network_matches_request(mac, net)) {
	215	if (!best) {
	216	best = net;
78e4f36e	217	rssi = best->stats.rssi;
370121e5 JB	218	continue;
	219	}
	220	/* we already had a matching network, so
	221	* compare their properties to get the
	222	* better of the two ... (see above)
	223	*/
78e4f36e JB	224	if (rssi < net->stats.rssi) {
	225	best = net;
	226	rssi = best->stats.rssi;
	227	}
370121e5 JB	228	}
	229	}
	230	/* if we unlock here, we might get interrupted and the `best'
	231	* pointer could go stale */
	232	if (best) {
	233	found = ieee80211softmac_create_network(mac, best);
	234	/* if found is still NULL, then we got -ENOMEM somewhere */
	235	if (found)
	236	ieee80211softmac_add_network(mac, found);
	237	}
	238	spin_unlock_irqrestore(&mac->ieee->lock, flags);
	239	}
	240
	241	if (!found) {
	242	if (mac->associnfo.scan_retry > 0) {
	243	spin_lock_irqsave(&mac->lock, flags);
	244	mac->associnfo.scan_retry--;
	245	spin_unlock_irqrestore(&mac->lock, flags);
	246
	247	/* We know of no such network. Let's scan.
	248	* NB: this also happens if we had no memory to copy the network info...
	249	* Maybe we can hope to have more memory after scanning finishes ;)
	250	*/
1dc09776	251	dprintk(KERN_INFO PFX "Associate: Scanning for networks first.\n");
370121e5 JB	252	ieee80211softmac_notify(mac->dev, IEEE80211SOFTMAC_EVENT_SCAN_FINISHED, ieee80211softmac_assoc_notify, NULL);
370121e5 JB	253	if (ieee80211softmac_start_scan(mac))
1dc09776	254	dprintk(KERN_INFO PFX "Associate: failed to initiate scan. Is device up?\n");
370121e5	255	return;
818667f7	256	} else {
370121e5 JB	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");
818667f7 JB	263	/* reset the retry counter for the next user request since we
	264	* break out and don't reschedule ourselves after this point. */
	265	mac->associnfo.scan_retry = IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT;
370121e5 JB	266	ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_NET_NOT_FOUND, NULL);
	267	return;
	268	}
	269	}
818667f7 JB	270
	271	/* reset the retry counter for the next user request since we
	272	* now found a net and will try to associate to it, but not
	273	* schedule this function again. */
	274	mac->associnfo.scan_retry = IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT;
370121e5 JB	275	mac->associnfo.bssvalid = 1;
	276	memcpy(mac->associnfo.bssid, found->bssid, ETH_ALEN);
	277	/* copy the ESSID for displaying it */
	278	mac->associnfo.associate_essid.len = found->essid.len;
	279	memcpy(mac->associnfo.associate_essid.data, found->essid.data, IW_ESSID_MAX_SIZE + 1);
	280
	281	/* we found a network! authenticate (if necessary) and associate to it. */
	282	if (!found->authenticated) {
	283	/* This relies on the fact that _auth_req only queues the work,
	284	* otherwise adding the notification would be racy. */
	285	if (!ieee80211softmac_auth_req(mac, found)) {
	286	dprintk(KERN_INFO PFX "cannot associate without being authenticated, requested authentication\n");
	287	ieee80211softmac_notify_internal(mac, IEEE80211SOFTMAC_EVENT_ANY, found, ieee80211softmac_assoc_notify, NULL, GFP_KERNEL);
	288	} else {
	289	printkl(KERN_WARNING PFX "Not authenticated, but requesting authentication failed. Giving up to associate\n");
	290	ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED, found);
	291	}
	292	return;
	293	}
	294	/* finally! now we can start associating */
	295	ieee80211softmac_assoc(mac, found);
	296	}
	297
	298	/* call this to do whatever is necessary when we're associated */
	299	static void
	300	ieee80211softmac_associated(struct ieee80211softmac_device *mac,
	301	struct ieee80211_assoc_response * resp,
	302	struct ieee80211softmac_network *net)
	303	{
	304	mac->associnfo.associating = 0;
8462fe3c DD	305	mac->associnfo.supported_rates = net->supported_rates;
	306	ieee80211softmac_recalc_txrates(mac);
	307
370121e5 JB	308	mac->associated = 1;
	309	if (mac->set_bssid_filter)
	310	mac->set_bssid_filter(mac->dev, net->bssid);
	311	memcpy(mac->ieee->bssid, net->bssid, ETH_ALEN);
2dd50801	312	netif_carrier_on(mac->dev);
370121e5 JB	313
	314	mac->association_id = le16_to_cpup(&resp->aid);
	315	}
	316
	317	/* received frame handling functions */
	318	int
	319	ieee80211softmac_handle_assoc_response(struct net_device * dev,
	320	struct ieee80211_assoc_response * resp,
	321	struct ieee80211_network * _ieee80211_network_do_not_use)
	322	{
	323	/* NOTE: the network parameter has to be ignored by
	324	* this code because it is the ieee80211's pointer
	325	* to the struct, not ours (we made a copy)
	326	*/
	327	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
	328	u16 status = le16_to_cpup(&resp->status);
	329	struct ieee80211softmac_network *network = NULL;
	330	unsigned long flags;
d57336e3 DD	331
	332	if (unlikely(!mac->running))
	333	return -ENODEV;
370121e5 JB	334
	335	spin_lock_irqsave(&mac->lock, flags);
	336
	337	if (!mac->associnfo.associating) {
	338	/* we race against the timeout function, so make sure
	339	* only one of us can do work */
	340	spin_unlock_irqrestore(&mac->lock, flags);
	341	return 0;
	342	}
	343	network = ieee80211softmac_get_network_by_bssid_locked(mac, resp->header.addr3);
	344
	345	/* someone sending us things without us knowing him? Ignore. */
	346	if (!network) {
	347	dprintk(KERN_INFO PFX "Received unrequested assocation response from " MAC_FMT "\n", MAC_ARG(resp->header.addr3));
	348	spin_unlock_irqrestore(&mac->lock, flags);
	349	return 0;
	350	}
	351
	352	/* now that we know it was for us, we can cancel the timeout */
	353	cancel_delayed_work(&mac->associnfo.timeout);
	354
	355	switch (status) {
	356	case 0:
	357	dprintk(KERN_INFO PFX "associated!\n");
	358	ieee80211softmac_associated(mac, resp, network);
	359	ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATED, network);
	360	break;
	361	case WLAN_REASON_STA_REQ_ASSOC_WITHOUT_AUTH:
	362	if (!network->auth_desynced_once) {
	363	/* there seem to be a few rare cases where our view of
	364	* the world is obscured, or buggy APs that don't DEAUTH
	365	* us properly. So we handle that, but allow it only once.
	366	*/
	367	printkl(KERN_INFO PFX "We were not authenticated during association, retrying...\n");
	368	network->authenticated = 0;
	369	/* we don't want to do this more than once ... */
	370	network->auth_desynced_once = 1;
5c4df6da	371	schedule_work(&mac->associnfo.work);
370121e5 JB	372	break;
	373	}
	374	default:
	375	dprintk(KERN_INFO PFX "associating failed (reason: 0x%x)!\n", status);
	376	mac->associnfo.associating = 0;
	377	mac->associnfo.bssvalid = 0;
	378	mac->associated = 0;
	379	ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED, network);
	380	}
	381
	382	spin_unlock_irqrestore(&mac->lock, flags);
	383	return 0;
	384	}
	385
	386	int
	387	ieee80211softmac_handle_disassoc(struct net_device * dev,
	388	struct ieee80211_disassoc *disassoc)
	389	{
	390	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
d57336e3 DD	391
	392	if (unlikely(!mac->running))
	393	return -ENODEV;
	394
48b2e4ce JB	395	if (memcmp(disassoc->header.addr2, mac->associnfo.bssid, ETH_ALEN))
48b2e4ce JB	396	return 0;
d57336e3	397
48b2e4ce JB	398	if (memcmp(disassoc->header.addr1, mac->dev->dev_addr, ETH_ALEN))
48b2e4ce JB	399	return 0;
d57336e3	400
370121e5	401	dprintk(KERN_INFO PFX "got disassoc frame\n");
6d92f83f DD	402	ieee80211softmac_disassoc(mac);
	403
	404	/* try to reassociate */
d1469cf2	405	schedule_work(&mac->associnfo.work);
6d92f83f	406
370121e5 JB	407	return 0;
370121e5 JB	408	}
b6c7658e JB	409
	410	int
	411	ieee80211softmac_handle_reassoc_req(struct net_device * dev,
	412	struct ieee80211_reassoc_request * resp)
	413	{
	414	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
	415	struct ieee80211softmac_network *network;
	416
d57336e3 DD	417	if (unlikely(!mac->running))
	418	return -ENODEV;
	419
b6c7658e JB	420	network = ieee80211softmac_get_network_by_bssid(mac, resp->header.addr3);
	421	if (!network) {
	422	dprintkl(KERN_INFO PFX "reassoc request from unknown network\n");
	423	return 0;
	424	}
9b0b4d8a MB	425	schedule_work(&mac->associnfo.work);
9b0b4d8a MB	426
b6c7658e JB	427	return 0;
b6c7658e JB	428	}