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Diffstat (limited to 'net/ieee80211/softmac/ieee80211softmac_assoc.c')
-rw-r--r--net/ieee80211/softmac/ieee80211softmac_assoc.c489
1 files changed, 0 insertions, 489 deletions
diff --git a/net/ieee80211/softmac/ieee80211softmac_assoc.c b/net/ieee80211/softmac/ieee80211softmac_assoc.c
deleted file mode 100644
index c4d122ddd72c..000000000000
--- a/net/ieee80211/softmac/ieee80211softmac_assoc.c
+++ /dev/null
@@ -1,489 +0,0 @@
1/*
2 * This file contains the softmac's association 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/*
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 */
37static void
38ieee80211softmac_assoc(struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net)
39{
40 unsigned long flags;
41
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 spin_lock_irqsave(&mac->lock, flags);
51 mac->associnfo.associated = 0; /* just to make sure */
52
53 /* Set a timer for timeout */
54 /* FIXME: make timeout configurable */
55 if (likely(mac->running))
56 queue_delayed_work(mac->wq, &mac->associnfo.timeout, 5 * HZ);
57 spin_unlock_irqrestore(&mac->lock, flags);
58}
59
60void
61ieee80211softmac_assoc_timeout(struct work_struct *work)
62{
63 struct ieee80211softmac_device *mac =
64 container_of(work, struct ieee80211softmac_device,
65 associnfo.timeout.work);
66 struct ieee80211softmac_network *n;
67
68 mutex_lock(&mac->associnfo.mutex);
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 goto out;
73 mac->associnfo.associating = 0;
74 mac->associnfo.bssvalid = 0;
75 mac->associnfo.associated = 0;
76
77 n = ieee80211softmac_get_network_by_bssid_locked(mac, mac->associnfo.bssid);
78
79 dprintk(KERN_INFO PFX "assoc request timed out!\n");
80 ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_TIMEOUT, n);
81out:
82 mutex_unlock(&mac->associnfo.mutex);
83}
84
85void
86ieee80211softmac_disassoc(struct ieee80211softmac_device *mac)
87{
88 unsigned long flags;
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->associnfo.associated = 0;
97 mac->associnfo.bssvalid = 0;
98 mac->associnfo.associating = 0;
99 ieee80211softmac_init_bss(mac);
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 */
105void
106ieee80211softmac_send_disassoc_req(struct ieee80211softmac_device *mac, u16 reason)
107{
108 struct ieee80211softmac_network *found;
109
110 if (mac->associnfo.bssvalid && mac->associnfo.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);
114 }
115
116 ieee80211softmac_disassoc(mac);
117}
118
119static inline int
120we_support_all_basic_rates(struct ieee80211softmac_device *mac, u8 *from, u8 from_len)
121{
122 int idx;
123 u8 rate;
124
125 for (idx = 0; idx < (from_len); idx++) {
126 rate = (from)[idx];
127 if (!(rate & IEEE80211_BASIC_RATE_MASK))
128 continue;
129 rate &= ~IEEE80211_BASIC_RATE_MASK;
130 if (!ieee80211softmac_ratesinfo_rate_supported(&mac->ratesinfo, rate))
131 return 0;
132 }
133 return 1;
134}
135
136static int
137network_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
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
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
166static void
167ieee80211softmac_assoc_notify_scan(struct net_device *dev, int event_type, void *context)
168{
169 struct ieee80211softmac_device *mac = ieee80211_priv(dev);
170 ieee80211softmac_assoc_work(&mac->associnfo.work.work);
171}
172
173static void
174ieee80211softmac_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(&mac->associnfo.work.work);
181 break;
182 case IEEE80211SOFTMAC_EVENT_AUTH_FAILED:
183 case IEEE80211SOFTMAC_EVENT_AUTH_TIMEOUT:
184 ieee80211softmac_disassoc(mac);
185 break;
186 }
187}
188
189/* This function is called to handle userspace requests (asynchronously) */
190void
191ieee80211softmac_assoc_work(struct work_struct *work)
192{
193 struct ieee80211softmac_device *mac =
194 container_of(work, struct ieee80211softmac_device,
195 associnfo.work.work);
196 struct ieee80211softmac_network *found = NULL;
197 struct ieee80211_network *net = NULL, *best = NULL;
198 int bssvalid;
199 unsigned long flags;
200
201 mutex_lock(&mac->associnfo.mutex);
202
203 if (!mac->associnfo.associating)
204 goto out;
205
206 /* ieee80211_disassoc might clear this */
207 bssvalid = mac->associnfo.bssvalid;
208
209 /* meh */
210 if (mac->associnfo.associated)
211 ieee80211softmac_send_disassoc_req(mac, WLAN_REASON_DISASSOC_STA_HAS_LEFT);
212
213 /* try to find the requested network in our list, if we found one already */
214 if (bssvalid || mac->associnfo.bssfixed)
215 found = ieee80211softmac_get_network_by_bssid(mac, mac->associnfo.bssid);
216
217 /* Search the ieee80211 networks for this network if we didn't find it by bssid,
218 * but only if we've scanned at least once (to get a better list of networks to
219 * select from). If we have not scanned before, the !found logic below will be
220 * invoked and will scan. */
221 if (!found && (mac->associnfo.scan_retry < IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT))
222 {
223 s8 rssi = -128; /* if I don't initialise, gcc emits an invalid warning
224 because it cannot follow the best pointer logic. */
225 spin_lock_irqsave(&mac->ieee->lock, flags);
226 list_for_each_entry(net, &mac->ieee->network_list, list) {
227 /* we're supposed to find the network with
228 * the best signal here, as we're asked to join
229 * any network with a specific ESSID, and many
230 * different ones could have that.
231 *
232 * I'll for now just go with the reported rssi.
233 *
234 * We also should take into account the rateset
235 * here to find the best BSSID to try.
236 */
237 if (network_matches_request(mac, net)) {
238 if (!best) {
239 best = net;
240 rssi = best->stats.rssi;
241 continue;
242 }
243 /* we already had a matching network, so
244 * compare their properties to get the
245 * better of the two ... (see above)
246 */
247 if (rssi < net->stats.rssi) {
248 best = net;
249 rssi = best->stats.rssi;
250 }
251 }
252 }
253 /* if we unlock here, we might get interrupted and the `best'
254 * pointer could go stale */
255 if (best) {
256 found = ieee80211softmac_create_network(mac, best);
257 /* if found is still NULL, then we got -ENOMEM somewhere */
258 if (found)
259 ieee80211softmac_add_network(mac, found);
260 }
261 spin_unlock_irqrestore(&mac->ieee->lock, flags);
262 }
263
264 if (!found) {
265 if (mac->associnfo.scan_retry > 0) {
266 mac->associnfo.scan_retry--;
267
268 /* We know of no such network. Let's scan.
269 * NB: this also happens if we had no memory to copy the network info...
270 * Maybe we can hope to have more memory after scanning finishes ;)
271 */
272 dprintk(KERN_INFO PFX "Associate: Scanning for networks first.\n");
273 ieee80211softmac_notify(mac->dev, IEEE80211SOFTMAC_EVENT_SCAN_FINISHED, ieee80211softmac_assoc_notify_scan, NULL);
274 if (ieee80211softmac_start_scan(mac)) {
275 dprintk(KERN_INFO PFX "Associate: failed to initiate scan. Is device up?\n");
276 }
277 goto out;
278 } else {
279 mac->associnfo.associating = 0;
280 mac->associnfo.associated = 0;
281
282 dprintk(KERN_INFO PFX "Unable to find matching network after scan!\n");
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;
286 ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_NET_NOT_FOUND, NULL);
287 goto out;
288 }
289 }
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;
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. */
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_auth, NULL, GFP_KERNEL);
307 }
308 goto out;
309 }
310 if (!found->authenticated && !found->authenticating) {
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)) {
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_auth, NULL, GFP_KERNEL);
318 }
319 } else {
320 printkl(KERN_WARNING PFX "Not authenticated, but requesting authentication failed. Giving up to associate\n");
321 mac->associnfo.assoc_wait = 0;
322 ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED, found);
323 }
324 goto out;
325 }
326 /* finally! now we can start associating */
327 mac->associnfo.assoc_wait = 0;
328 ieee80211softmac_assoc(mac, found);
329
330out:
331 mutex_unlock(&mac->associnfo.mutex);
332}
333
334/* call this to do whatever is necessary when we're associated */
335static void
336ieee80211softmac_associated(struct ieee80211softmac_device *mac,
337 struct ieee80211_assoc_response * resp,
338 struct ieee80211softmac_network *net)
339{
340 u16 cap = le16_to_cpu(resp->capability);
341 u8 erp_value = net->erp_value;
342
343 mac->associnfo.associating = 0;
344 mac->bssinfo.supported_rates = net->supported_rates;
345 ieee80211softmac_recalc_txrates(mac);
346
347 mac->associnfo.associated = 1;
348
349 mac->associnfo.short_preamble_available =
350 (cap & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0;
351 ieee80211softmac_process_erp(mac, erp_value);
352
353 if (mac->set_bssid_filter)
354 mac->set_bssid_filter(mac->dev, net->bssid);
355 memcpy(mac->ieee->bssid, net->bssid, ETH_ALEN);
356 netif_carrier_on(mac->dev);
357
358 mac->association_id = le16_to_cpup(&resp->aid);
359}
360
361/* received frame handling functions */
362int
363ieee80211softmac_handle_assoc_response(struct net_device * dev,
364 struct ieee80211_assoc_response * resp,
365 struct ieee80211_network * _ieee80211_network)
366{
367 /* NOTE: the network parameter has to be mostly ignored by
368 * this code because it is the ieee80211's pointer
369 * to the struct, not ours (we made a copy)
370 */
371 struct ieee80211softmac_device *mac = ieee80211_priv(dev);
372 u16 status = le16_to_cpup(&resp->status);
373 struct ieee80211softmac_network *network = NULL;
374 unsigned long flags;
375 DECLARE_MAC_BUF(mac2);
376
377 if (unlikely(!mac->running))
378 return -ENODEV;
379
380 spin_lock_irqsave(&mac->lock, flags);
381
382 if (!mac->associnfo.associating) {
383 /* we race against the timeout function, so make sure
384 * only one of us can do work */
385 spin_unlock_irqrestore(&mac->lock, flags);
386 return 0;
387 }
388 network = ieee80211softmac_get_network_by_bssid_locked(mac, resp->header.addr3);
389
390 /* someone sending us things without us knowing him? Ignore. */
391 if (!network) {
392 dprintk(KERN_INFO PFX "Received unrequested assocation response from %s\n",
393 print_mac(mac2, resp->header.addr3));
394 spin_unlock_irqrestore(&mac->lock, flags);
395 return 0;
396 }
397
398 /* now that we know it was for us, we can cancel the timeout */
399 cancel_delayed_work(&mac->associnfo.timeout);
400
401 /* if the association response included an ERP IE, update our saved
402 * copy */
403 if (_ieee80211_network->flags & NETWORK_HAS_ERP_VALUE)
404 network->erp_value = _ieee80211_network->erp_value;
405
406 switch (status) {
407 case 0:
408 dprintk(KERN_INFO PFX "associated!\n");
409 ieee80211softmac_associated(mac, resp, network);
410 ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATED, network);
411 break;
412 case WLAN_REASON_STA_REQ_ASSOC_WITHOUT_AUTH:
413 if (!network->auth_desynced_once) {
414 /* there seem to be a few rare cases where our view of
415 * the world is obscured, or buggy APs that don't DEAUTH
416 * us properly. So we handle that, but allow it only once.
417 */
418 printkl(KERN_INFO PFX "We were not authenticated during association, retrying...\n");
419 network->authenticated = 0;
420 /* we don't want to do this more than once ... */
421 network->auth_desynced_once = 1;
422 queue_delayed_work(mac->wq, &mac->associnfo.work, 0);
423 break;
424 }
425 default:
426 dprintk(KERN_INFO PFX "associating failed (reason: 0x%x)!\n", status);
427 mac->associnfo.associating = 0;
428 mac->associnfo.bssvalid = 0;
429 mac->associnfo.associated = 0;
430 ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED, network);
431 }
432
433 spin_unlock_irqrestore(&mac->lock, flags);
434 return 0;
435}
436
437void
438ieee80211softmac_try_reassoc(struct ieee80211softmac_device *mac)
439{
440 unsigned long flags;
441
442 spin_lock_irqsave(&mac->lock, flags);
443 mac->associnfo.associating = 1;
444 queue_delayed_work(mac->wq, &mac->associnfo.work, 0);
445 spin_unlock_irqrestore(&mac->lock, flags);
446}
447
448int
449ieee80211softmac_handle_disassoc(struct net_device * dev,
450 struct ieee80211_disassoc *disassoc)
451{
452 struct ieee80211softmac_device *mac = ieee80211_priv(dev);
453
454 if (unlikely(!mac->running))
455 return -ENODEV;
456
457 if (memcmp(disassoc->header.addr2, mac->associnfo.bssid, ETH_ALEN))
458 return 0;
459
460 if (memcmp(disassoc->header.addr1, mac->dev->dev_addr, ETH_ALEN))
461 return 0;
462
463 dprintk(KERN_INFO PFX "got disassoc frame\n");
464 ieee80211softmac_disassoc(mac);
465
466 ieee80211softmac_try_reassoc(mac);
467
468 return 0;
469}
470
471int
472ieee80211softmac_handle_reassoc_req(struct net_device * dev,
473 struct ieee80211_reassoc_request * resp)
474{
475 struct ieee80211softmac_device *mac = ieee80211_priv(dev);
476 struct ieee80211softmac_network *network;
477
478 if (unlikely(!mac->running))
479 return -ENODEV;
480
481 network = ieee80211softmac_get_network_by_bssid(mac, resp->header.addr3);
482 if (!network) {
483 dprintkl(KERN_INFO PFX "reassoc request from unknown network\n");
484 return 0;
485 }
486 queue_delayed_work(mac->wq, &mac->associnfo.work, 0);
487
488 return 0;
489}
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-01 12:20:34 -0500