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4855d25b JB |
1 | /* |
2 | * This file contains the softmac's authentication 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 | 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 | function_enter(); | |
40 | ||
41 | if (net->authenticating) | |
42 | return 0; | |
43 | ||
44 | /* Add the network if it's not already added */ | |
45 | ieee80211softmac_add_network(mac, net); | |
46 | ||
47 | dprintk(KERN_NOTICE PFX "Queueing Authentication Request to "MAC_FMT"\n", MAC_ARG(net->bssid)); | |
48 | /* Queue the auth request */ | |
49 | auth = (struct ieee80211softmac_auth_queue_item *) | |
50 | kmalloc(sizeof(struct ieee80211softmac_auth_queue_item), GFP_KERNEL); | |
51 | if(auth == NULL) | |
52 | return -ENOMEM; | |
53 | ||
54 | auth->net = net; | |
55 | auth->mac = mac; | |
56 | auth->retry = IEEE80211SOFTMAC_AUTH_RETRY_LIMIT; | |
57 | auth->state = IEEE80211SOFTMAC_AUTH_OPEN_REQUEST; | |
58 | INIT_WORK(&auth->work, &ieee80211softmac_auth_queue, (void *)auth); | |
59 | ||
60 | /* Lock (for list) */ | |
61 | spin_lock_irqsave(&mac->lock, flags); | |
62 | ||
63 | /* add to list */ | |
64 | list_add_tail(&auth->list, &mac->auth_queue); | |
5c4df6da | 65 | schedule_work(&auth->work); |
370121e5 JB |
66 | spin_unlock_irqrestore(&mac->lock, flags); |
67 | ||
68 | return 0; | |
69 | } | |
70 | ||
71 | ||
72 | /* Sends an auth request to the desired AP and handles timeouts */ | |
73 | static void | |
74 | ieee80211softmac_auth_queue(void *data) | |
75 | { | |
76 | struct ieee80211softmac_device *mac; | |
77 | struct ieee80211softmac_auth_queue_item *auth; | |
78 | struct ieee80211softmac_network *net; | |
79 | unsigned long flags; | |
80 | ||
81 | function_enter(); | |
82 | ||
83 | auth = (struct ieee80211softmac_auth_queue_item *)data; | |
84 | net = auth->net; | |
85 | mac = auth->mac; | |
86 | ||
87 | if(auth->retry > 0) { | |
88 | /* Switch to correct channel for this network */ | |
89 | mac->set_channel(mac->dev, net->channel); | |
90 | ||
91 | /* Lock and set flags */ | |
92 | spin_lock_irqsave(&mac->lock, flags); | |
93 | net->authenticated = 0; | |
94 | net->authenticating = 1; | |
95 | /* add a timeout call so we eventually give up waiting for an auth reply */ | |
5c4df6da | 96 | schedule_delayed_work(&auth->work, IEEE80211SOFTMAC_AUTH_TIMEOUT); |
370121e5 JB |
97 | auth->retry--; |
98 | spin_unlock_irqrestore(&mac->lock, flags); | |
99 | if (ieee80211softmac_send_mgt_frame(mac, auth->net, IEEE80211_STYPE_AUTH, auth->state)) | |
100 | dprintk(KERN_NOTICE PFX "Sending Authentication Request to "MAC_FMT" failed (this shouldn't happen, wait for the timeout).\n", MAC_ARG(net->bssid)); | |
101 | else | |
102 | dprintk(KERN_NOTICE PFX "Sent Authentication Request to "MAC_FMT".\n", MAC_ARG(net->bssid)); | |
103 | return; | |
104 | } | |
105 | ||
106 | printkl(KERN_WARNING PFX "Authentication timed out with "MAC_FMT"\n", MAC_ARG(net->bssid)); | |
107 | /* Remove this item from the queue */ | |
108 | spin_lock_irqsave(&mac->lock, flags); | |
109 | ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_AUTH_TIMEOUT, net); | |
110 | cancel_delayed_work(&auth->work); /* just to make sure... */ | |
111 | list_del(&auth->list); | |
112 | spin_unlock_irqrestore(&mac->lock, flags); | |
113 | /* Free it */ | |
114 | kfree(auth); | |
115 | } | |
116 | ||
117 | /* Handle the auth response from the AP | |
118 | * This should be registered with ieee80211 as handle_auth | |
119 | */ | |
120 | int | |
121 | ieee80211softmac_auth_resp(struct net_device *dev, struct ieee80211_auth *auth) | |
122 | { | |
123 | ||
124 | struct list_head *list_ptr; | |
125 | struct ieee80211softmac_device *mac = ieee80211_priv(dev); | |
126 | struct ieee80211softmac_auth_queue_item *aq = NULL; | |
127 | struct ieee80211softmac_network *net = NULL; | |
128 | unsigned long flags; | |
129 | u8 * data; | |
130 | ||
131 | function_enter(); | |
132 | ||
133 | /* Find correct auth queue item */ | |
134 | spin_lock_irqsave(&mac->lock, flags); | |
135 | list_for_each(list_ptr, &mac->auth_queue) { | |
136 | aq = list_entry(list_ptr, struct ieee80211softmac_auth_queue_item, list); | |
137 | net = aq->net; | |
138 | if (!memcmp(net->bssid, auth->header.addr2, ETH_ALEN)) | |
139 | break; | |
140 | else | |
141 | aq = NULL; | |
142 | } | |
143 | spin_unlock_irqrestore(&mac->lock, flags); | |
144 | ||
145 | /* Make sure that we've got an auth queue item for this request */ | |
146 | if(aq == NULL) | |
147 | { | |
148 | printkl(KERN_DEBUG PFX "Authentication response received from "MAC_FMT" but no queue item exists.\n", MAC_ARG(auth->header.addr2)); | |
149 | /* Error #? */ | |
150 | return -1; | |
151 | } | |
152 | ||
153 | /* Check for out of order authentication */ | |
154 | if(!net->authenticating) | |
155 | { | |
156 | printkl(KERN_DEBUG PFX "Authentication response received from "MAC_FMT" but did not request authentication.\n",MAC_ARG(auth->header.addr2)); | |
157 | return -1; | |
158 | } | |
159 | ||
160 | /* Parse the auth packet */ | |
161 | switch(auth->algorithm) { | |
162 | case WLAN_AUTH_OPEN: | |
163 | /* Check the status code of the response */ | |
164 | ||
165 | switch(auth->status) { | |
166 | case WLAN_STATUS_SUCCESS: | |
167 | /* Update the status to Authenticated */ | |
168 | spin_lock_irqsave(&mac->lock, flags); | |
169 | net->authenticating = 0; | |
170 | net->authenticated = 1; | |
171 | spin_unlock_irqrestore(&mac->lock, flags); | |
172 | ||
173 | /* Send event */ | |
174 | printkl(KERN_NOTICE PFX "Open Authentication completed with "MAC_FMT"\n", MAC_ARG(net->bssid)); | |
175 | ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_AUTHENTICATED, net); | |
176 | break; | |
177 | default: | |
178 | /* Lock and reset flags */ | |
179 | spin_lock_irqsave(&mac->lock, flags); | |
180 | net->authenticated = 0; | |
181 | net->authenticating = 0; | |
182 | spin_unlock_irqrestore(&mac->lock, flags); | |
183 | ||
184 | printkl(KERN_NOTICE PFX "Open Authentication with "MAC_FMT" failed, error code: %i\n", | |
185 | MAC_ARG(net->bssid), le16_to_cpup(&auth->status)); | |
186 | /* Count the error? */ | |
187 | break; | |
188 | } | |
189 | goto free_aq; | |
190 | break; | |
191 | case WLAN_AUTH_SHARED_KEY: | |
192 | /* Figure out where we are in the process */ | |
193 | switch(auth->transaction) { | |
194 | case IEEE80211SOFTMAC_AUTH_SHARED_CHALLENGE: | |
195 | /* Check to make sure we have a challenge IE */ | |
196 | data = (u8 *)auth->info_element; | |
197 | if(*data++ != MFIE_TYPE_CHALLENGE){ | |
198 | printkl(KERN_NOTICE PFX "Shared Key Authentication failed due to a missing challenge.\n"); | |
199 | break; | |
200 | } | |
201 | /* Save the challenge */ | |
202 | spin_lock_irqsave(&mac->lock, flags); | |
203 | net->challenge_len = *data++; | |
204 | if(net->challenge_len > WLAN_AUTH_CHALLENGE_LEN) | |
205 | net->challenge_len = WLAN_AUTH_CHALLENGE_LEN; | |
206 | if(net->challenge != NULL) | |
207 | kfree(net->challenge); | |
208 | net->challenge = kmalloc(net->challenge_len, GFP_ATOMIC); | |
209 | memcpy(net->challenge, data, net->challenge_len); | |
210 | aq->state = IEEE80211SOFTMAC_AUTH_SHARED_RESPONSE; | |
211 | spin_unlock_irqrestore(&mac->lock, flags); | |
212 | ||
213 | /* Switch to correct channel for this network */ | |
214 | mac->set_channel(mac->dev, net->channel); | |
215 | ||
216 | /* Send our response (How to encrypt?) */ | |
217 | ieee80211softmac_send_mgt_frame(mac, aq->net, IEEE80211_STYPE_AUTH, aq->state); | |
218 | break; | |
219 | case IEEE80211SOFTMAC_AUTH_SHARED_PASS: | |
220 | /* Check the status code of the response */ | |
221 | switch(auth->status) { | |
222 | case WLAN_STATUS_SUCCESS: | |
223 | /* Update the status to Authenticated */ | |
224 | spin_lock_irqsave(&mac->lock, flags); | |
225 | net->authenticating = 0; | |
226 | net->authenticated = 1; | |
227 | spin_unlock_irqrestore(&mac->lock, flags); | |
228 | printkl(KERN_NOTICE PFX "Shared Key Authentication completed with "MAC_FMT"\n", | |
229 | MAC_ARG(net->bssid)); | |
230 | break; | |
231 | default: | |
232 | printkl(KERN_NOTICE PFX "Shared Key Authentication with "MAC_FMT" failed, error code: %i\n", | |
233 | MAC_ARG(net->bssid), le16_to_cpup(&auth->status)); | |
234 | /* Lock and reset flags */ | |
235 | spin_lock_irqsave(&mac->lock, flags); | |
236 | net->authenticating = 0; | |
237 | net->authenticated = 0; | |
238 | spin_unlock_irqrestore(&mac->lock, flags); | |
239 | /* Count the error? */ | |
240 | break; | |
241 | } | |
242 | goto free_aq; | |
243 | break; | |
244 | default: | |
245 | printkl(KERN_WARNING PFX "Unhandled Authentication Step: %i\n", auth->transaction); | |
246 | break; | |
247 | } | |
248 | goto free_aq; | |
249 | break; | |
250 | default: | |
251 | /* ERROR */ | |
252 | goto free_aq; | |
253 | break; | |
254 | } | |
255 | return 0; | |
256 | free_aq: | |
257 | /* Cancel the timeout */ | |
258 | spin_lock_irqsave(&mac->lock, flags); | |
259 | cancel_delayed_work(&aq->work); | |
260 | /* Remove this item from the queue */ | |
261 | list_del(&aq->list); | |
262 | spin_unlock_irqrestore(&mac->lock, flags); | |
263 | ||
264 | /* Free it */ | |
265 | kfree(aq); | |
266 | return 0; | |
267 | } | |
268 | ||
269 | /* | |
270 | * Handle deauthorization | |
271 | */ | |
714e1a51 | 272 | static void |
370121e5 JB |
273 | ieee80211softmac_deauth_from_net(struct ieee80211softmac_device *mac, |
274 | struct ieee80211softmac_network *net) | |
275 | { | |
276 | struct ieee80211softmac_auth_queue_item *aq = NULL; | |
277 | struct list_head *list_ptr; | |
278 | unsigned long flags; | |
279 | ||
280 | function_enter(); | |
281 | ||
282 | /* Lock and reset status flags */ | |
283 | spin_lock_irqsave(&mac->lock, flags); | |
284 | net->authenticating = 0; | |
285 | net->authenticated = 0; | |
286 | ||
287 | /* Find correct auth queue item, if it exists */ | |
288 | list_for_each(list_ptr, &mac->auth_queue) { | |
289 | aq = list_entry(list_ptr, struct ieee80211softmac_auth_queue_item, list); | |
290 | if (!memcmp(net->bssid, aq->net->bssid, ETH_ALEN)) | |
291 | break; | |
292 | else | |
293 | aq = NULL; | |
294 | } | |
295 | ||
296 | /* Cancel pending work */ | |
297 | if(aq != NULL) | |
298 | /* Not entirely safe? What about running work? */ | |
299 | cancel_delayed_work(&aq->work); | |
300 | ||
301 | /* Free our network ref */ | |
302 | ieee80211softmac_del_network_locked(mac, net); | |
303 | if(net->challenge != NULL) | |
304 | kfree(net->challenge); | |
305 | kfree(net); | |
306 | ||
2dd50801 JB |
307 | /* can't transmit data right now... */ |
308 | netif_carrier_off(mac->dev); | |
370121e5 | 309 | /* let's try to re-associate */ |
5c4df6da | 310 | schedule_work(&mac->associnfo.work); |
370121e5 JB |
311 | spin_unlock_irqrestore(&mac->lock, flags); |
312 | } | |
313 | ||
314 | /* | |
315 | * Sends a deauth request to the desired AP | |
316 | */ | |
317 | int | |
318 | ieee80211softmac_deauth_req(struct ieee80211softmac_device *mac, | |
319 | struct ieee80211softmac_network *net, int reason) | |
320 | { | |
321 | int ret; | |
322 | ||
323 | function_enter(); | |
324 | ||
325 | /* Make sure the network is authenticated */ | |
326 | if (!net->authenticated) | |
327 | { | |
328 | printkl(KERN_DEBUG PFX "Can't send deauthentication packet, network is not authenticated.\n"); | |
329 | /* Error okay? */ | |
330 | return -EPERM; | |
331 | } | |
332 | ||
333 | /* Send the de-auth packet */ | |
334 | if((ret = ieee80211softmac_send_mgt_frame(mac, net, IEEE80211_STYPE_DEAUTH, reason))) | |
335 | return ret; | |
336 | ||
337 | ieee80211softmac_deauth_from_net(mac, net); | |
338 | return 0; | |
339 | } | |
340 | ||
341 | /* | |
342 | * This should be registered with ieee80211 as handle_deauth | |
343 | */ | |
344 | int | |
345 | ieee80211softmac_deauth_resp(struct net_device *dev, struct ieee80211_auth *auth) | |
346 | { | |
347 | ||
348 | struct ieee80211softmac_network *net = NULL; | |
349 | struct ieee80211softmac_device *mac = ieee80211_priv(dev); | |
350 | ||
351 | function_enter(); | |
352 | ||
353 | if (!auth) { | |
354 | dprintk("deauth without deauth packet. eek!\n"); | |
355 | return 0; | |
356 | } | |
357 | ||
358 | net = ieee80211softmac_get_network_by_bssid(mac, auth->header.addr2); | |
359 | ||
360 | if (net == NULL) { | |
361 | printkl(KERN_DEBUG PFX "Recieved deauthentication packet from "MAC_FMT", but that network is unknown.\n", | |
362 | MAC_ARG(auth->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 | return 0; | |
376 | } |