Merge branch 'from-linus' into upstream
[linux-2.6] / net / ieee80211 / softmac / ieee80211softmac_auth.c
1 /*
2  * This file contains the softmac's authentication logic.
3  *
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>
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
27 #include "ieee80211softmac_priv.h"
28
29 static void ieee80211softmac_auth_queue(void *data);
30
31 /* Queues an auth request to the desired AP */
32 int
33 ieee80211softmac_auth_req(struct ieee80211softmac_device *mac, 
34         struct ieee80211softmac_network *net)
35 {
36         struct ieee80211softmac_auth_queue_item *auth;
37         unsigned long flags;
38         
39         if (net->authenticating)
40                 return 0;
41
42         /* Add the network if it's not already added */
43         ieee80211softmac_add_network(mac, net);
44
45         dprintk(KERN_NOTICE PFX "Queueing Authentication Request to "MAC_FMT"\n", MAC_ARG(net->bssid));
46         /* Queue the auth request */
47         auth = (struct ieee80211softmac_auth_queue_item *)
48                 kmalloc(sizeof(struct ieee80211softmac_auth_queue_item), GFP_KERNEL);
49         if(auth == NULL)
50                 return -ENOMEM;
51
52         auth->net = net;
53         auth->mac = mac;
54         auth->retry = IEEE80211SOFTMAC_AUTH_RETRY_LIMIT;
55         auth->state = IEEE80211SOFTMAC_AUTH_OPEN_REQUEST;
56         INIT_WORK(&auth->work, &ieee80211softmac_auth_queue, (void *)auth);
57         
58         /* Lock (for list) */
59         spin_lock_irqsave(&mac->lock, flags);
60
61         /* add to list */
62         list_add_tail(&auth->list, &mac->auth_queue);
63         schedule_work(&auth->work);
64         spin_unlock_irqrestore(&mac->lock, flags);
65         
66         return 0;
67 }
68
69
70 /* Sends an auth request to the desired AP and handles timeouts */
71 static void
72 ieee80211softmac_auth_queue(void *data)
73 {
74         struct ieee80211softmac_device *mac;
75         struct ieee80211softmac_auth_queue_item *auth;
76         struct ieee80211softmac_network *net;
77         unsigned long flags;
78
79         auth = (struct ieee80211softmac_auth_queue_item *)data;
80         net = auth->net;
81         mac = auth->mac;
82
83         if(auth->retry > 0) {
84                 /* Switch to correct channel for this network */
85                 mac->set_channel(mac->dev, net->channel);
86                 
87                 /* Lock and set flags */
88                 spin_lock_irqsave(&mac->lock, flags);
89                 if (unlikely(!mac->running)) {
90                         /* Prevent reschedule on workqueue flush */
91                         spin_unlock_irqrestore(&mac->lock, flags);
92                         return;
93                 }
94                 net->authenticated = 0;
95                 net->authenticating = 1;
96                 /* add a timeout call so we eventually give up waiting for an auth reply */
97                 schedule_delayed_work(&auth->work, IEEE80211SOFTMAC_AUTH_TIMEOUT);
98                 auth->retry--;
99                 spin_unlock_irqrestore(&mac->lock, flags);
100                 if (ieee80211softmac_send_mgt_frame(mac, auth->net, IEEE80211_STYPE_AUTH, auth->state))
101                         dprintk(KERN_NOTICE PFX "Sending Authentication Request to "MAC_FMT" failed (this shouldn't happen, wait for the timeout).\n", MAC_ARG(net->bssid));
102                 else
103                         dprintk(KERN_NOTICE PFX "Sent Authentication Request to "MAC_FMT".\n", MAC_ARG(net->bssid));
104                 return;
105         }
106
107         printkl(KERN_WARNING PFX "Authentication timed out with "MAC_FMT"\n", MAC_ARG(net->bssid));
108         /* Remove this item from the queue */
109         spin_lock_irqsave(&mac->lock, flags);
110         ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_AUTH_TIMEOUT, net);
111         cancel_delayed_work(&auth->work); /* just to make sure... */
112         list_del(&auth->list);
113         spin_unlock_irqrestore(&mac->lock, flags);
114         /* Free it */
115         kfree(auth);
116 }
117
118 /* Handle the auth response from the AP
119  * This should be registered with ieee80211 as handle_auth 
120  */
121 int 
122 ieee80211softmac_auth_resp(struct net_device *dev, struct ieee80211_auth *auth)
123 {       
124
125         struct list_head *list_ptr;
126         struct ieee80211softmac_device *mac = ieee80211_priv(dev);
127         struct ieee80211softmac_auth_queue_item *aq = NULL;
128         struct ieee80211softmac_network *net = NULL;
129         unsigned long flags;
130         u8 * data;
131         
132         if (unlikely(!mac->running))
133                 return -ENODEV;
134
135         /* Find correct auth queue item */
136         spin_lock_irqsave(&mac->lock, flags);
137         list_for_each(list_ptr, &mac->auth_queue) {
138                 aq = list_entry(list_ptr, struct ieee80211softmac_auth_queue_item, list);
139                 net = aq->net;
140                 if (!memcmp(net->bssid, auth->header.addr2, ETH_ALEN))
141                         break;
142                 else
143                         aq = NULL;
144         }
145         spin_unlock_irqrestore(&mac->lock, flags);
146         
147         /* Make sure that we've got an auth queue item for this request */
148         if(aq == NULL)
149         {
150                 printkl(KERN_DEBUG PFX "Authentication response received from "MAC_FMT" but no queue item exists.\n", MAC_ARG(auth->header.addr2));
151                 /* Error #? */
152                 return -1;
153         }                       
154         
155         /* Check for out of order authentication */
156         if(!net->authenticating)
157         {
158                 printkl(KERN_DEBUG PFX "Authentication response received from "MAC_FMT" but did not request authentication.\n",MAC_ARG(auth->header.addr2));
159                 return -1;
160         }
161
162         /* Parse the auth packet */
163         switch(auth->algorithm) {
164         case WLAN_AUTH_OPEN:
165                 /* Check the status code of the response */
166
167                 switch(auth->status) {
168                 case WLAN_STATUS_SUCCESS:
169                         /* Update the status to Authenticated */
170                         spin_lock_irqsave(&mac->lock, flags);
171                         net->authenticating = 0;
172                         net->authenticated = 1;
173                         spin_unlock_irqrestore(&mac->lock, flags);
174                         
175                         /* Send event */
176                         printkl(KERN_NOTICE PFX "Open Authentication completed with "MAC_FMT"\n", MAC_ARG(net->bssid));
177                         ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_AUTHENTICATED, net);
178                         break;
179                 default:
180                         /* Lock and reset flags */
181                         spin_lock_irqsave(&mac->lock, flags);
182                         net->authenticated = 0;
183                         net->authenticating = 0;
184                         spin_unlock_irqrestore(&mac->lock, flags);
185                         
186                         printkl(KERN_NOTICE PFX "Open Authentication with "MAC_FMT" failed, error code: %i\n", 
187                                 MAC_ARG(net->bssid), le16_to_cpup(&auth->status));
188                         /* Count the error? */
189                         break;
190                 }
191                 goto free_aq;
192                 break;
193         case WLAN_AUTH_SHARED_KEY:
194                 /* Figure out where we are in the process */
195                 switch(auth->transaction) {
196                 case IEEE80211SOFTMAC_AUTH_SHARED_CHALLENGE:
197                         /* Check to make sure we have a challenge IE */
198                         data = (u8 *)auth->info_element;
199                         if(*data++ != MFIE_TYPE_CHALLENGE){
200                                 printkl(KERN_NOTICE PFX "Shared Key Authentication failed due to a missing challenge.\n");
201                                 break;  
202                         }
203                         /* Save the challenge */
204                         spin_lock_irqsave(&mac->lock, flags);
205                         net->challenge_len = *data++;   
206                         if(net->challenge_len > WLAN_AUTH_CHALLENGE_LEN)
207                                 net->challenge_len = WLAN_AUTH_CHALLENGE_LEN;
208                         if(net->challenge != NULL)
209                                 kfree(net->challenge);
210                         net->challenge = kmalloc(net->challenge_len, GFP_ATOMIC);
211                         memcpy(net->challenge, data, net->challenge_len);
212                         aq->state = IEEE80211SOFTMAC_AUTH_SHARED_RESPONSE; 
213                         spin_unlock_irqrestore(&mac->lock, flags);
214
215                         /* Switch to correct channel for this network */
216                         mac->set_channel(mac->dev, net->channel);
217                         
218                         /* Send our response (How to encrypt?) */
219                         ieee80211softmac_send_mgt_frame(mac, aq->net, IEEE80211_STYPE_AUTH, aq->state);
220                         break;
221                 case IEEE80211SOFTMAC_AUTH_SHARED_PASS:
222                         /* Check the status code of the response */
223                         switch(auth->status) {
224                         case WLAN_STATUS_SUCCESS:
225                                 /* Update the status to Authenticated */        
226                                 spin_lock_irqsave(&mac->lock, flags);
227                                 net->authenticating = 0;
228                                 net->authenticated = 1;
229                                 spin_unlock_irqrestore(&mac->lock, flags);
230                                 printkl(KERN_NOTICE PFX "Shared Key Authentication completed with "MAC_FMT"\n", 
231                                         MAC_ARG(net->bssid));
232                                 break;
233                         default:
234                                 printkl(KERN_NOTICE PFX "Shared Key Authentication with "MAC_FMT" failed, error code: %i\n", 
235                                         MAC_ARG(net->bssid), le16_to_cpup(&auth->status));
236                                 /* Lock and reset flags */
237                                 spin_lock_irqsave(&mac->lock, flags);
238                                 net->authenticating = 0;
239                                 net->authenticated = 0;
240                                 spin_unlock_irqrestore(&mac->lock, flags);
241                                 /* Count the error? */
242                                 break;
243                         }
244                         goto free_aq;
245                         break;
246                 default:
247                         printkl(KERN_WARNING PFX "Unhandled Authentication Step: %i\n", auth->transaction);
248                         break;
249                 }
250                 goto free_aq;
251                 break;
252         default:
253                 /* ERROR */     
254                 goto free_aq;
255                 break;
256         }
257         return 0;
258 free_aq:
259         /* Cancel the timeout */
260         spin_lock_irqsave(&mac->lock, flags);
261         cancel_delayed_work(&aq->work);
262         /* Remove this item from the queue */
263         list_del(&aq->list);
264         spin_unlock_irqrestore(&mac->lock, flags);
265
266         /* Free it */
267         kfree(aq);
268         return 0;
269 }
270
271 /*
272  * Handle deauthorization
273  */
274 static void
275 ieee80211softmac_deauth_from_net(struct ieee80211softmac_device *mac,
276         struct ieee80211softmac_network *net)
277 {
278         struct ieee80211softmac_auth_queue_item *aq = NULL;
279         struct list_head *list_ptr;
280         unsigned long flags;
281
282         /* deauthentication implies disassociation */
283         ieee80211softmac_disassoc(mac);
284
285         /* Lock and reset status flags */
286         spin_lock_irqsave(&mac->lock, flags);
287         net->authenticating = 0;
288         net->authenticated = 0;
289         
290         /* Find correct auth queue item, if it exists */
291         list_for_each(list_ptr, &mac->auth_queue) {
292                 aq = list_entry(list_ptr, struct ieee80211softmac_auth_queue_item, list);
293                 if (!memcmp(net->bssid, aq->net->bssid, ETH_ALEN))
294                         break;
295                 else
296                         aq = NULL;
297         }
298         
299         /* Cancel pending work */
300         if(aq != NULL)
301                 /* Not entirely safe?  What about running work? */
302                 cancel_delayed_work(&aq->work);
303
304         /* Free our network ref */
305         ieee80211softmac_del_network_locked(mac, net);
306         if(net->challenge != NULL)
307                 kfree(net->challenge);
308         kfree(net);
309         
310         /* can't transmit data right now... */
311         netif_carrier_off(mac->dev);
312         spin_unlock_irqrestore(&mac->lock, flags);
313 }
314
315 /* 
316  * Sends a deauth request to the desired AP
317  */
318 int 
319 ieee80211softmac_deauth_req(struct ieee80211softmac_device *mac, 
320         struct ieee80211softmac_network *net, int reason)
321 {
322         int ret;
323         
324         /* Make sure the network is authenticated */
325         if (!net->authenticated)
326         {
327                 printkl(KERN_DEBUG PFX "Can't send deauthentication packet, network is not authenticated.\n");
328                 /* Error okay? */
329                 return -EPERM;
330         }
331         
332         /* Send the de-auth packet */
333         if((ret = ieee80211softmac_send_mgt_frame(mac, net, IEEE80211_STYPE_DEAUTH, reason)))
334                 return ret;
335         
336         ieee80211softmac_deauth_from_net(mac, net);
337         return 0;
338 }
339  
340 /*
341  * This should be registered with ieee80211 as handle_deauth
342  */
343 int 
344 ieee80211softmac_deauth_resp(struct net_device *dev, struct ieee80211_deauth *deauth)
345 {
346         
347         struct ieee80211softmac_network *net = NULL;
348         struct ieee80211softmac_device *mac = ieee80211_priv(dev);
349         
350         if (unlikely(!mac->running))
351                 return -ENODEV;
352
353         if (!deauth) {
354                 dprintk("deauth without deauth packet. eek!\n");
355                 return 0;
356         }
357
358         net = ieee80211softmac_get_network_by_bssid(mac, deauth->header.addr2);
359         
360         if (net == NULL) {
361                 printkl(KERN_DEBUG PFX "Received deauthentication packet from "MAC_FMT", but that network is unknown.\n",
362                         MAC_ARG(deauth->header.addr2));
363                 return 0;
364         }
365
366         /* Make sure the network is authenticated */
367         if(!net->authenticated)
368         {
369                 printkl(KERN_DEBUG PFX "Can't perform deauthentication, network is not authenticated.\n");
370                 /* Error okay? */
371                 return -EPERM;
372         }
373
374         ieee80211softmac_deauth_from_net(mac, net);
375
376         /* let's try to re-associate */
377         schedule_work(&mac->associnfo.work);
378         return 0;
379 }