diff options
Diffstat (limited to 'net/ieee80211/softmac/ieee80211softmac_auth.c')
| -rw-r--r-- | net/ieee80211/softmac/ieee80211softmac_auth.c | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/net/ieee80211/softmac/ieee80211softmac_auth.c b/net/ieee80211/softmac/ieee80211softmac_auth.c new file mode 100644 index 00000000000..ac09e0c836e --- /dev/null +++ b/net/ieee80211/softmac/ieee80211softmac_auth.c @@ -0,0 +1,376 @@ +/* + * This file contains the softmac's authentication 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" + +static void ieee80211softmac_auth_queue(void *data); + +/* Queues an auth request to the desired AP */ +int +ieee80211softmac_auth_req(struct ieee80211softmac_device *mac, + struct ieee80211softmac_network *net) +{ + struct ieee80211softmac_auth_queue_item *auth; + unsigned long flags; + + function_enter(); + + if (net->authenticating) + return 0; + + /* Add the network if it's not already added */ + ieee80211softmac_add_network(mac, net); + + dprintk(KERN_NOTICE PFX "Queueing Authentication Request to "MAC_FMT"\n", MAC_ARG(net->bssid)); + /* Queue the auth request */ + auth = (struct ieee80211softmac_auth_queue_item *) + kmalloc(sizeof(struct ieee80211softmac_auth_queue_item), GFP_KERNEL); + if(auth == NULL) + return -ENOMEM; + + auth->net = net; + auth->mac = mac; + auth->retry = IEEE80211SOFTMAC_AUTH_RETRY_LIMIT; + auth->state = IEEE80211SOFTMAC_AUTH_OPEN_REQUEST; + INIT_WORK(&auth->work, &ieee80211softmac_auth_queue, (void *)auth); + + /* Lock (for list) */ + spin_lock_irqsave(&mac->lock, flags); + + /* add to list */ + list_add_tail(&auth->list, &mac->auth_queue); + schedule_work(&auth->work); + spin_unlock_irqrestore(&mac->lock, flags); + + return 0; +} + + +/* Sends an auth request to the desired AP and handles timeouts */ +static void +ieee80211softmac_auth_queue(void *data) +{ + struct ieee80211softmac_device *mac; + struct ieee80211softmac_auth_queue_item *auth; + struct ieee80211softmac_network *net; + unsigned long flags; + + function_enter(); + + auth = (struct ieee80211softmac_auth_queue_item *)data; + net = auth->net; + mac = auth->mac; + + if(auth->retry > 0) { + /* Switch to correct channel for this network */ + mac->set_channel(mac->dev, net->channel); + + /* Lock and set flags */ + spin_lock_irqsave(&mac->lock, flags); + net->authenticated = 0; + net->authenticating = 1; + /* add a timeout call so we eventually give up waiting for an auth reply */ + schedule_delayed_work(&auth->work, IEEE80211SOFTMAC_AUTH_TIMEOUT); + auth->retry--; + spin_unlock_irqrestore(&mac->lock, flags); + if (ieee80211softmac_send_mgt_frame(mac, auth->net, IEEE80211_STYPE_AUTH, auth->state)) + dprintk(KERN_NOTICE PFX "Sending Authentication Request to "MAC_FMT" failed (this shouldn't happen, wait for the timeout).\n", MAC_ARG(net->bssid)); + else + dprintk(KERN_NOTICE PFX "Sent Authentication Request to "MAC_FMT".\n", MAC_ARG(net->bssid)); + return; + } + + printkl(KERN_WARNING PFX "Authentication timed out with "MAC_FMT"\n", MAC_ARG(net->bssid)); + /* Remove this item from the queue */ + spin_lock_irqsave(&mac->lock, flags); + ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_AUTH_TIMEOUT, net); + cancel_delayed_work(&auth->work); /* just to make sure... */ + list_del(&auth->list); + spin_unlock_irqrestore(&mac->lock, flags); + /* Free it */ + kfree(auth); +} + +/* Handle the auth response from the AP + * This should be registered with ieee80211 as handle_auth + */ +int +ieee80211softmac_auth_resp(struct net_device *dev, struct ieee80211_auth *auth) +{ + + struct list_head *list_ptr; + struct ieee80211softmac_device *mac = ieee80211_priv(dev); + struct ieee80211softmac_auth_queue_item *aq = NULL; + struct ieee80211softmac_network *net = NULL; + unsigned long flags; + u8 * data; + + function_enter(); + + /* Find correct auth queue item */ + spin_lock_irqsave(&mac->lock, flags); + list_for_each(list_ptr, &mac->auth_queue) { + aq = list_entry(list_ptr, struct ieee80211softmac_auth_queue_item, list); + net = aq->net; + if (!memcmp(net->bssid, auth->header.addr2, ETH_ALEN)) + break; + else + aq = NULL; + } + spin_unlock_irqrestore(&mac->lock, flags); + + /* Make sure that we've got an auth queue item for this request */ + if(aq == NULL) + { + printkl(KERN_DEBUG PFX "Authentication response received from "MAC_FMT" but no queue item exists.\n", MAC_ARG(auth->header.addr2)); + /* Error #? */ + return -1; + } + + /* Check for out of order authentication */ + if(!net->authenticating) + { + printkl(KERN_DEBUG PFX "Authentication response received from "MAC_FMT" but did not request authentication.\n",MAC_ARG(auth->header.addr2)); + return -1; + } + + /* Parse the auth packet */ + switch(auth->algorithm) { + case WLAN_AUTH_OPEN: + /* Check the status code of the response */ + + switch(auth->status) { + case WLAN_STATUS_SUCCESS: + /* Update the status to Authenticated */ + spin_lock_irqsave(&mac->lock, flags); + net->authenticating = 0; + net->authenticated = 1; + spin_unlock_irqrestore(&mac->lock, flags); + + /* Send event */ + printkl(KERN_NOTICE PFX "Open Authentication completed with "MAC_FMT"\n", MAC_ARG(net->bssid)); + ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_AUTHENTICATED, net); + break; + default: + /* Lock and reset flags */ + spin_lock_irqsave(&mac->lock, flags); + net->authenticated = 0; + net->authenticating = 0; + spin_unlock_irqrestore(&mac->lock, flags); + + printkl(KERN_NOTICE PFX "Open Authentication with "MAC_FMT" failed, error code: %i\n", + MAC_ARG(net->bssid), le16_to_cpup(&auth->status)); + /* Count the error? */ + break; + } + goto free_aq; + break; + case WLAN_AUTH_SHARED_KEY: + /* Figure out where we are in the process */ + switch(auth->transaction) { + case IEEE80211SOFTMAC_AUTH_SHARED_CHALLENGE: + /* Check to make sure we have a challenge IE */ + data = (u8 *)auth->info_element; + if(*data++ != MFIE_TYPE_CHALLENGE){ + printkl(KERN_NOTICE PFX "Shared Key Authentication failed due to a missing challenge.\n"); + break; + } + /* Save the challenge */ + spin_lock_irqsave(&mac->lock, flags); + net->challenge_len = *data++; + if(net->challenge_len > WLAN_AUTH_CHALLENGE_LEN) + net->challenge_len = WLAN_AUTH_CHALLENGE_LEN; + if(net->challenge != NULL) + kfree(net->challenge); + net->challenge = kmalloc(net->challenge_len, GFP_ATOMIC); + memcpy(net->challenge, data, net->challenge_len); + aq->state = IEEE80211SOFTMAC_AUTH_SHARED_RESPONSE; + spin_unlock_irqrestore(&mac->lock, flags); + + /* Switch to correct channel for this network */ + mac->set_channel(mac->dev, net->channel); + + /* Send our response (How to encrypt?) */ + ieee80211softmac_send_mgt_frame(mac, aq->net, IEEE80211_STYPE_AUTH, aq->state); + break; + case IEEE80211SOFTMAC_AUTH_SHARED_PASS: + /* Check the status code of the response */ + switch(auth->status) { + case WLAN_STATUS_SUCCESS: + /* Update the status to Authenticated */ + spin_lock_irqsave(&mac->lock, flags); + net->authenticating = 0; + net->authenticated = 1; + spin_unlock_irqrestore(&mac->lock, flags); + printkl(KERN_NOTICE PFX "Shared Key Authentication completed with "MAC_FMT"\n", + MAC_ARG(net->bssid)); + break; + default: + printkl(KERN_NOTICE PFX "Shared Key Authentication with "MAC_FMT" failed, error code: %i\n", + MAC_ARG(net->bssid), le16_to_cpup(&auth->status)); + /* Lock and reset flags */ + spin_lock_irqsave(&mac->lock, flags); + net->authenticating = 0; + net->authenticated = 0; + spin_unlock_irqrestore(&mac->lock, flags); + /* Count the error? */ + break; + } + goto free_aq; + break; + default: + printkl(KERN_WARNING PFX "Unhandled Authentication Step: %i\n", auth->transaction); + break; + } + goto free_aq; + break; + default: + /* ERROR */ + goto free_aq; + break; + } + return 0; +free_aq: + /* Cancel the timeout */ + spin_lock_irqsave(&mac->lock, flags); + cancel_delayed_work(&aq->work); + /* Remove this item from the queue */ + list_del(&aq->list); + spin_unlock_irqrestore(&mac->lock, flags); + + /* Free it */ + kfree(aq); + return 0; +} + +/* + * Handle deauthorization + */ +static void +ieee80211softmac_deauth_from_net(struct ieee80211softmac_device *mac, + struct ieee80211softmac_network *net) +{ + struct ieee80211softmac_auth_queue_item *aq = NULL; + struct list_head *list_ptr; + unsigned long flags; + + function_enter(); + + /* Lock and reset status flags */ + spin_lock_irqsave(&mac->lock, flags); + net->authenticating = 0; + net->authenticated = 0; + + /* Find correct auth queue item, if it exists */ + list_for_each(list_ptr, &mac->auth_queue) { + aq = list_entry(list_ptr, struct ieee80211softmac_auth_queue_item, list); + if (!memcmp(net->bssid, aq->net->bssid, ETH_ALEN)) + break; + else + aq = NULL; + } + + /* Cancel pending work */ + if(aq != NULL) + /* Not entirely safe? What about running work? */ + cancel_delayed_work(&aq->work); + + /* Free our network ref */ + ieee80211softmac_del_network_locked(mac, net); + if(net->challenge != NULL) + kfree(net->challenge); + kfree(net); + + /* can't transmit data right now... */ + netif_carrier_off(mac->dev); + /* let's try to re-associate */ + schedule_work(&mac->associnfo.work); + spin_unlock_irqrestore(&mac->lock, flags); +} + +/* + * Sends a deauth request to the desired AP + */ +int +ieee80211softmac_deauth_req(struct ieee80211softmac_device *mac, + struct ieee80211softmac_network *net, int reason) +{ + int ret; + + function_enter(); + + /* Make sure the network is authenticated */ + if (!net->authenticated) + { + printkl(KERN_DEBUG PFX "Can't send deauthentication packet, network is not authenticated.\n"); + /* Error okay? */ + return -EPERM; + } + + /* Send the de-auth packet */ + if((ret = ieee80211softmac_send_mgt_frame(mac, net, IEEE80211_STYPE_DEAUTH, reason))) + return ret; + + ieee80211softmac_deauth_from_net(mac, net); + return 0; +} + +/* + * This should be registered with ieee80211 as handle_deauth + */ +int +ieee80211softmac_deauth_resp(struct net_device *dev, struct ieee80211_deauth *deauth) +{ + + struct ieee80211softmac_network *net = NULL; + struct ieee80211softmac_device *mac = ieee80211_priv(dev); + + function_enter(); + + if (!deauth) { + dprintk("deauth without deauth packet. eek!\n"); + return 0; + } + + net = ieee80211softmac_get_network_by_bssid(mac, deauth->header.addr2); + + if (net == NULL) { + printkl(KERN_DEBUG PFX "Received deauthentication packet from "MAC_FMT", but that network is unknown.\n", + MAC_ARG(deauth->header.addr2)); + return 0; + } + + /* Make sure the network is authenticated */ + if(!net->authenticated) + { + printkl(KERN_DEBUG PFX "Can't perform deauthentication, network is not authenticated.\n"); + /* Error okay? */ + return -EPERM; + } + + ieee80211softmac_deauth_from_net(mac, net); + return 0; +} |