Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6.git] / net / wireless / sme.c
1 /*
2  * SME code for cfg80211's connect emulation.
3  *
4  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
5  * Copyright (C) 2009   Intel Corporation. All rights reserved.
6  */
7
8 #include <linux/etherdevice.h>
9 #include <linux/if_arp.h>
10 #include <linux/workqueue.h>
11 #include <linux/wireless.h>
12 #include <net/iw_handler.h>
13 #include <net/cfg80211.h>
14 #include <net/rtnetlink.h>
15 #include "nl80211.h"
16 #include "reg.h"
17
18 struct cfg80211_conn {
19         struct cfg80211_connect_params params;
20         /* these are sub-states of the _CONNECTING sme_state */
21         enum {
22                 CFG80211_CONN_IDLE,
23                 CFG80211_CONN_SCANNING,
24                 CFG80211_CONN_SCAN_AGAIN,
25                 CFG80211_CONN_AUTHENTICATE_NEXT,
26                 CFG80211_CONN_AUTHENTICATING,
27                 CFG80211_CONN_ASSOCIATE_NEXT,
28                 CFG80211_CONN_ASSOCIATING,
29                 CFG80211_CONN_DEAUTH_ASSOC_FAIL,
30         } state;
31         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
32         u8 *ie;
33         size_t ie_len;
34         bool auto_auth, prev_bssid_valid;
35 };
36
37
38 static int cfg80211_conn_scan(struct wireless_dev *wdev)
39 {
40         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
41         struct cfg80211_scan_request *request;
42         int n_channels, err;
43
44         ASSERT_RTNL();
45         ASSERT_RDEV_LOCK(rdev);
46         ASSERT_WDEV_LOCK(wdev);
47
48         if (rdev->scan_req)
49                 return -EBUSY;
50
51         if (wdev->conn->params.channel) {
52                 n_channels = 1;
53         } else {
54                 enum ieee80211_band band;
55                 n_channels = 0;
56
57                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
58                         if (!wdev->wiphy->bands[band])
59                                 continue;
60                         n_channels += wdev->wiphy->bands[band]->n_channels;
61                 }
62         }
63         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
64                           sizeof(request->channels[0]) * n_channels,
65                           GFP_KERNEL);
66         if (!request)
67                 return -ENOMEM;
68
69         if (wdev->conn->params.channel)
70                 request->channels[0] = wdev->conn->params.channel;
71         else {
72                 int i = 0, j;
73                 enum ieee80211_band band;
74
75                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
76                         if (!wdev->wiphy->bands[band])
77                                 continue;
78                         for (j = 0; j < wdev->wiphy->bands[band]->n_channels;
79                              i++, j++)
80                                 request->channels[i] =
81                                         &wdev->wiphy->bands[band]->channels[j];
82                 }
83         }
84         request->n_channels = n_channels;
85         request->ssids = (void *)&request->channels[n_channels];
86         request->n_ssids = 1;
87
88         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
89                 wdev->conn->params.ssid_len);
90         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
91
92         request->dev = wdev->netdev;
93         request->wiphy = &rdev->wiphy;
94
95         rdev->scan_req = request;
96
97         err = rdev->ops->scan(wdev->wiphy, wdev->netdev, request);
98         if (!err) {
99                 wdev->conn->state = CFG80211_CONN_SCANNING;
100                 nl80211_send_scan_start(rdev, wdev->netdev);
101                 dev_hold(wdev->netdev);
102         } else {
103                 rdev->scan_req = NULL;
104                 kfree(request);
105         }
106         return err;
107 }
108
109 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
110 {
111         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
112         struct cfg80211_connect_params *params;
113         const u8 *prev_bssid = NULL;
114         int err;
115
116         ASSERT_WDEV_LOCK(wdev);
117
118         if (!wdev->conn)
119                 return 0;
120
121         params = &wdev->conn->params;
122
123         switch (wdev->conn->state) {
124         case CFG80211_CONN_SCAN_AGAIN:
125                 return cfg80211_conn_scan(wdev);
126         case CFG80211_CONN_AUTHENTICATE_NEXT:
127                 BUG_ON(!rdev->ops->auth);
128                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
129                 return __cfg80211_mlme_auth(rdev, wdev->netdev,
130                                             params->channel, params->auth_type,
131                                             params->bssid,
132                                             params->ssid, params->ssid_len,
133                                             NULL, 0,
134                                             params->key, params->key_len,
135                                             params->key_idx);
136         case CFG80211_CONN_ASSOCIATE_NEXT:
137                 BUG_ON(!rdev->ops->assoc);
138                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
139                 if (wdev->conn->prev_bssid_valid)
140                         prev_bssid = wdev->conn->prev_bssid;
141                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev,
142                                             params->channel, params->bssid,
143                                             prev_bssid,
144                                             params->ssid, params->ssid_len,
145                                             params->ie, params->ie_len,
146                                             false, &params->crypto);
147                 if (err)
148                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
149                                                NULL, 0,
150                                                WLAN_REASON_DEAUTH_LEAVING);
151                 return err;
152         case CFG80211_CONN_DEAUTH_ASSOC_FAIL:
153                 __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
154                                        NULL, 0,
155                                        WLAN_REASON_DEAUTH_LEAVING);
156                 /* return an error so that we call __cfg80211_connect_result() */
157                 return -EINVAL;
158         default:
159                 return 0;
160         }
161 }
162
163 void cfg80211_conn_work(struct work_struct *work)
164 {
165         struct cfg80211_registered_device *rdev =
166                 container_of(work, struct cfg80211_registered_device, conn_work);
167         struct wireless_dev *wdev;
168         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
169
170         rtnl_lock();
171         cfg80211_lock_rdev(rdev);
172         mutex_lock(&rdev->devlist_mtx);
173
174         list_for_each_entry(wdev, &rdev->netdev_list, list) {
175                 wdev_lock(wdev);
176                 if (!netif_running(wdev->netdev)) {
177                         wdev_unlock(wdev);
178                         continue;
179                 }
180                 if (wdev->sme_state != CFG80211_SME_CONNECTING) {
181                         wdev_unlock(wdev);
182                         continue;
183                 }
184                 if (wdev->conn->params.bssid) {
185                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
186                         bssid = bssid_buf;
187                 }
188                 if (cfg80211_conn_do_work(wdev))
189                         __cfg80211_connect_result(
190                                         wdev->netdev, bssid,
191                                         NULL, 0, NULL, 0,
192                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
193                                         false, NULL);
194                 wdev_unlock(wdev);
195         }
196
197         mutex_unlock(&rdev->devlist_mtx);
198         cfg80211_unlock_rdev(rdev);
199         rtnl_unlock();
200 }
201
202 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
203 {
204         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
205         struct cfg80211_bss *bss;
206         u16 capa = WLAN_CAPABILITY_ESS;
207
208         ASSERT_WDEV_LOCK(wdev);
209
210         if (wdev->conn->params.privacy)
211                 capa |= WLAN_CAPABILITY_PRIVACY;
212
213         bss = cfg80211_get_bss(wdev->wiphy, NULL, wdev->conn->params.bssid,
214                                wdev->conn->params.ssid,
215                                wdev->conn->params.ssid_len,
216                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
217                                capa);
218         if (!bss)
219                 return NULL;
220
221         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
222         wdev->conn->params.bssid = wdev->conn->bssid;
223         wdev->conn->params.channel = bss->channel;
224         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
225         schedule_work(&rdev->conn_work);
226
227         return bss;
228 }
229
230 static void __cfg80211_sme_scan_done(struct net_device *dev)
231 {
232         struct wireless_dev *wdev = dev->ieee80211_ptr;
233         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
234         struct cfg80211_bss *bss;
235
236         ASSERT_WDEV_LOCK(wdev);
237
238         if (wdev->sme_state != CFG80211_SME_CONNECTING)
239                 return;
240
241         if (!wdev->conn)
242                 return;
243
244         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
245             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
246                 return;
247
248         bss = cfg80211_get_conn_bss(wdev);
249         if (bss) {
250                 cfg80211_put_bss(bss);
251         } else {
252                 /* not found */
253                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
254                         schedule_work(&rdev->conn_work);
255                 else
256                         __cfg80211_connect_result(
257                                         wdev->netdev,
258                                         wdev->conn->params.bssid,
259                                         NULL, 0, NULL, 0,
260                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
261                                         false, NULL);
262         }
263 }
264
265 void cfg80211_sme_scan_done(struct net_device *dev)
266 {
267         struct wireless_dev *wdev = dev->ieee80211_ptr;
268
269         mutex_lock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
270         wdev_lock(wdev);
271         __cfg80211_sme_scan_done(dev);
272         wdev_unlock(wdev);
273         mutex_unlock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
274 }
275
276 void cfg80211_sme_rx_auth(struct net_device *dev,
277                           const u8 *buf, size_t len)
278 {
279         struct wireless_dev *wdev = dev->ieee80211_ptr;
280         struct wiphy *wiphy = wdev->wiphy;
281         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
282         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
283         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
284
285         ASSERT_WDEV_LOCK(wdev);
286
287         /* should only RX auth frames when connecting */
288         if (wdev->sme_state != CFG80211_SME_CONNECTING)
289                 return;
290
291         if (WARN_ON(!wdev->conn))
292                 return;
293
294         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
295             wdev->conn->auto_auth &&
296             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
297                 /* select automatically between only open, shared, leap */
298                 switch (wdev->conn->params.auth_type) {
299                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
300                         if (wdev->connect_keys)
301                                 wdev->conn->params.auth_type =
302                                         NL80211_AUTHTYPE_SHARED_KEY;
303                         else
304                                 wdev->conn->params.auth_type =
305                                         NL80211_AUTHTYPE_NETWORK_EAP;
306                         break;
307                 case NL80211_AUTHTYPE_SHARED_KEY:
308                         wdev->conn->params.auth_type =
309                                 NL80211_AUTHTYPE_NETWORK_EAP;
310                         break;
311                 default:
312                         /* huh? */
313                         wdev->conn->params.auth_type =
314                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
315                         break;
316                 }
317                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
318                 schedule_work(&rdev->conn_work);
319         } else if (status_code != WLAN_STATUS_SUCCESS) {
320                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
321                                           status_code, false, NULL);
322         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
323                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
324                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
325                 schedule_work(&rdev->conn_work);
326         }
327 }
328
329 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev)
330 {
331         struct wiphy *wiphy = wdev->wiphy;
332         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
333
334         if (WARN_ON(!wdev->conn))
335                 return false;
336
337         if (!wdev->conn->prev_bssid_valid)
338                 return false;
339
340         /*
341          * Some stupid APs don't accept reassoc, so we
342          * need to fall back to trying regular assoc.
343          */
344         wdev->conn->prev_bssid_valid = false;
345         wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
346         schedule_work(&rdev->conn_work);
347
348         return true;
349 }
350
351 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev)
352 {
353         struct wiphy *wiphy = wdev->wiphy;
354         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
355
356         wdev->conn->state = CFG80211_CONN_DEAUTH_ASSOC_FAIL;
357         schedule_work(&rdev->conn_work);
358 }
359
360 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
361                                const u8 *req_ie, size_t req_ie_len,
362                                const u8 *resp_ie, size_t resp_ie_len,
363                                u16 status, bool wextev,
364                                struct cfg80211_bss *bss)
365 {
366         struct wireless_dev *wdev = dev->ieee80211_ptr;
367         u8 *country_ie;
368 #ifdef CONFIG_CFG80211_WEXT
369         union iwreq_data wrqu;
370 #endif
371
372         ASSERT_WDEV_LOCK(wdev);
373
374         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
375                 return;
376
377         if (wdev->sme_state != CFG80211_SME_CONNECTING)
378                 return;
379
380         nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
381                                     bssid, req_ie, req_ie_len,
382                                     resp_ie, resp_ie_len,
383                                     status, GFP_KERNEL);
384
385 #ifdef CONFIG_CFG80211_WEXT
386         if (wextev) {
387                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
388                         memset(&wrqu, 0, sizeof(wrqu));
389                         wrqu.data.length = req_ie_len;
390                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
391                 }
392
393                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
394                         memset(&wrqu, 0, sizeof(wrqu));
395                         wrqu.data.length = resp_ie_len;
396                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
397                 }
398
399                 memset(&wrqu, 0, sizeof(wrqu));
400                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
401                 if (bssid && status == WLAN_STATUS_SUCCESS) {
402                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
403                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
404                         wdev->wext.prev_bssid_valid = true;
405                 }
406                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
407         }
408 #endif
409
410         if (wdev->current_bss) {
411                 cfg80211_unhold_bss(wdev->current_bss);
412                 cfg80211_put_bss(&wdev->current_bss->pub);
413                 wdev->current_bss = NULL;
414         }
415
416         if (wdev->conn)
417                 wdev->conn->state = CFG80211_CONN_IDLE;
418
419         if (status != WLAN_STATUS_SUCCESS) {
420                 wdev->sme_state = CFG80211_SME_IDLE;
421                 if (wdev->conn)
422                         kfree(wdev->conn->ie);
423                 kfree(wdev->conn);
424                 wdev->conn = NULL;
425                 kfree(wdev->connect_keys);
426                 wdev->connect_keys = NULL;
427                 wdev->ssid_len = 0;
428                 return;
429         }
430
431         if (!bss)
432                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
433                                        wdev->ssid, wdev->ssid_len,
434                                        WLAN_CAPABILITY_ESS,
435                                        WLAN_CAPABILITY_ESS);
436
437         if (WARN_ON(!bss))
438                 return;
439
440         cfg80211_hold_bss(bss_from_pub(bss));
441         wdev->current_bss = bss_from_pub(bss);
442
443         wdev->sme_state = CFG80211_SME_CONNECTED;
444         cfg80211_upload_connect_keys(wdev);
445
446         country_ie = (u8 *) ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
447
448         if (!country_ie)
449                 return;
450
451         /*
452          * ieee80211_bss_get_ie() ensures we can access:
453          * - country_ie + 2, the start of the country ie data, and
454          * - and country_ie[1] which is the IE length
455          */
456         regulatory_hint_11d(wdev->wiphy,
457                             bss->channel->band,
458                             country_ie + 2,
459                             country_ie[1]);
460 }
461
462 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
463                              const u8 *req_ie, size_t req_ie_len,
464                              const u8 *resp_ie, size_t resp_ie_len,
465                              u16 status, gfp_t gfp)
466 {
467         struct wireless_dev *wdev = dev->ieee80211_ptr;
468         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
469         struct cfg80211_event *ev;
470         unsigned long flags;
471
472         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
473
474         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
475         if (!ev)
476                 return;
477
478         ev->type = EVENT_CONNECT_RESULT;
479         if (bssid)
480                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
481         ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
482         ev->cr.req_ie_len = req_ie_len;
483         memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
484         ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
485         ev->cr.resp_ie_len = resp_ie_len;
486         memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
487         ev->cr.status = status;
488
489         spin_lock_irqsave(&wdev->event_lock, flags);
490         list_add_tail(&ev->list, &wdev->event_list);
491         spin_unlock_irqrestore(&wdev->event_lock, flags);
492         queue_work(cfg80211_wq, &rdev->event_work);
493 }
494 EXPORT_SYMBOL(cfg80211_connect_result);
495
496 void __cfg80211_roamed(struct wireless_dev *wdev, const u8 *bssid,
497                        const u8 *req_ie, size_t req_ie_len,
498                        const u8 *resp_ie, size_t resp_ie_len)
499 {
500         struct cfg80211_bss *bss;
501 #ifdef CONFIG_CFG80211_WEXT
502         union iwreq_data wrqu;
503 #endif
504
505         ASSERT_WDEV_LOCK(wdev);
506
507         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
508                 return;
509
510         if (wdev->sme_state != CFG80211_SME_CONNECTED)
511                 return;
512
513         /* internal error -- how did we get to CONNECTED w/o BSS? */
514         if (WARN_ON(!wdev->current_bss)) {
515                 return;
516         }
517
518         cfg80211_unhold_bss(wdev->current_bss);
519         cfg80211_put_bss(&wdev->current_bss->pub);
520         wdev->current_bss = NULL;
521
522         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
523                                wdev->ssid, wdev->ssid_len,
524                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
525
526         if (WARN_ON(!bss))
527                 return;
528
529         cfg80211_hold_bss(bss_from_pub(bss));
530         wdev->current_bss = bss_from_pub(bss);
531
532         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bssid,
533                             req_ie, req_ie_len, resp_ie, resp_ie_len,
534                             GFP_KERNEL);
535
536 #ifdef CONFIG_CFG80211_WEXT
537         if (req_ie) {
538                 memset(&wrqu, 0, sizeof(wrqu));
539                 wrqu.data.length = req_ie_len;
540                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
541                                     &wrqu, req_ie);
542         }
543
544         if (resp_ie) {
545                 memset(&wrqu, 0, sizeof(wrqu));
546                 wrqu.data.length = resp_ie_len;
547                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
548                                     &wrqu, resp_ie);
549         }
550
551         memset(&wrqu, 0, sizeof(wrqu));
552         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
553         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
554         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
555         wdev->wext.prev_bssid_valid = true;
556         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
557 #endif
558 }
559
560 void cfg80211_roamed(struct net_device *dev, const u8 *bssid,
561                      const u8 *req_ie, size_t req_ie_len,
562                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
563 {
564         struct wireless_dev *wdev = dev->ieee80211_ptr;
565         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
566         struct cfg80211_event *ev;
567         unsigned long flags;
568
569         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
570
571         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
572         if (!ev)
573                 return;
574
575         ev->type = EVENT_ROAMED;
576         memcpy(ev->rm.bssid, bssid, ETH_ALEN);
577         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
578         ev->rm.req_ie_len = req_ie_len;
579         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
580         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
581         ev->rm.resp_ie_len = resp_ie_len;
582         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
583
584         spin_lock_irqsave(&wdev->event_lock, flags);
585         list_add_tail(&ev->list, &wdev->event_list);
586         spin_unlock_irqrestore(&wdev->event_lock, flags);
587         queue_work(cfg80211_wq, &rdev->event_work);
588 }
589 EXPORT_SYMBOL(cfg80211_roamed);
590
591 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
592                              size_t ie_len, u16 reason, bool from_ap)
593 {
594         struct wireless_dev *wdev = dev->ieee80211_ptr;
595         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
596         int i;
597 #ifdef CONFIG_CFG80211_WEXT
598         union iwreq_data wrqu;
599 #endif
600
601         ASSERT_WDEV_LOCK(wdev);
602
603         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
604                 return;
605
606         if (wdev->sme_state != CFG80211_SME_CONNECTED)
607                 return;
608
609         if (wdev->current_bss) {
610                 cfg80211_unhold_bss(wdev->current_bss);
611                 cfg80211_put_bss(&wdev->current_bss->pub);
612         }
613
614         wdev->current_bss = NULL;
615         wdev->sme_state = CFG80211_SME_IDLE;
616         wdev->ssid_len = 0;
617
618         if (wdev->conn) {
619                 const u8 *bssid;
620                 int ret;
621
622                 kfree(wdev->conn->ie);
623                 wdev->conn->ie = NULL;
624                 kfree(wdev->conn);
625                 wdev->conn = NULL;
626
627                 /*
628                  * If this disconnect was due to a disassoc, we
629                  * we might still have an auth BSS around. For
630                  * the userspace SME that's currently expected,
631                  * but for the kernel SME (nl80211 CONNECT or
632                  * wireless extensions) we want to clear up all
633                  * state.
634                  */
635                 for (i = 0; i < MAX_AUTH_BSSES; i++) {
636                         if (!wdev->auth_bsses[i])
637                                 continue;
638                         bssid = wdev->auth_bsses[i]->pub.bssid;
639                         ret = __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
640                                                 WLAN_REASON_DEAUTH_LEAVING);
641                         WARN(ret, "deauth failed: %d\n", ret);
642                 }
643         }
644
645         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
646
647         /*
648          * Delete all the keys ... pairwise keys can't really
649          * exist any more anyway, but default keys might.
650          */
651         if (rdev->ops->del_key)
652                 for (i = 0; i < 6; i++)
653                         rdev->ops->del_key(wdev->wiphy, dev, i, NULL);
654
655 #ifdef CONFIG_CFG80211_WEXT
656         memset(&wrqu, 0, sizeof(wrqu));
657         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
658         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
659         wdev->wext.connect.ssid_len = 0;
660 #endif
661 }
662
663 void cfg80211_disconnected(struct net_device *dev, u16 reason,
664                            u8 *ie, size_t ie_len, gfp_t gfp)
665 {
666         struct wireless_dev *wdev = dev->ieee80211_ptr;
667         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
668         struct cfg80211_event *ev;
669         unsigned long flags;
670
671         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
672
673         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
674         if (!ev)
675                 return;
676
677         ev->type = EVENT_DISCONNECTED;
678         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
679         ev->dc.ie_len = ie_len;
680         memcpy((void *)ev->dc.ie, ie, ie_len);
681         ev->dc.reason = reason;
682
683         spin_lock_irqsave(&wdev->event_lock, flags);
684         list_add_tail(&ev->list, &wdev->event_list);
685         spin_unlock_irqrestore(&wdev->event_lock, flags);
686         queue_work(cfg80211_wq, &rdev->event_work);
687 }
688 EXPORT_SYMBOL(cfg80211_disconnected);
689
690 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
691                        struct net_device *dev,
692                        struct cfg80211_connect_params *connect,
693                        struct cfg80211_cached_keys *connkeys,
694                        const u8 *prev_bssid)
695 {
696         struct wireless_dev *wdev = dev->ieee80211_ptr;
697         struct ieee80211_channel *chan;
698         struct cfg80211_bss *bss = NULL;
699         int err;
700
701         ASSERT_WDEV_LOCK(wdev);
702
703         if (wdev->sme_state != CFG80211_SME_IDLE)
704                 return -EALREADY;
705
706         chan = rdev_fixed_channel(rdev, wdev);
707         if (chan && chan != connect->channel)
708                 return -EBUSY;
709
710         if (WARN_ON(wdev->connect_keys)) {
711                 kfree(wdev->connect_keys);
712                 wdev->connect_keys = NULL;
713         }
714
715         if (connkeys && connkeys->def >= 0) {
716                 int idx;
717                 u32 cipher;
718
719                 idx = connkeys->def;
720                 cipher = connkeys->params[idx].cipher;
721                 /* If given a WEP key we may need it for shared key auth */
722                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
723                     cipher == WLAN_CIPHER_SUITE_WEP104) {
724                         connect->key_idx = idx;
725                         connect->key = connkeys->params[idx].key;
726                         connect->key_len = connkeys->params[idx].key_len;
727
728                         /*
729                          * If ciphers are not set (e.g. when going through
730                          * iwconfig), we have to set them appropriately here.
731                          */
732                         if (connect->crypto.cipher_group == 0)
733                                 connect->crypto.cipher_group = cipher;
734
735                         if (connect->crypto.n_ciphers_pairwise == 0) {
736                                 connect->crypto.n_ciphers_pairwise = 1;
737                                 connect->crypto.ciphers_pairwise[0] = cipher;
738                         }
739                 }
740         }
741
742         if (!rdev->ops->connect) {
743                 if (!rdev->ops->auth || !rdev->ops->assoc)
744                         return -EOPNOTSUPP;
745
746                 if (WARN_ON(wdev->conn))
747                         return -EINPROGRESS;
748
749                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
750                 if (!wdev->conn)
751                         return -ENOMEM;
752
753                 /*
754                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
755                  */
756                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
757                 if (connect->bssid) {
758                         wdev->conn->params.bssid = wdev->conn->bssid;
759                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
760                 }
761
762                 if (connect->ie) {
763                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
764                                                 GFP_KERNEL);
765                         wdev->conn->params.ie = wdev->conn->ie;
766                         if (!wdev->conn->ie) {
767                                 kfree(wdev->conn);
768                                 wdev->conn = NULL;
769                                 return -ENOMEM;
770                         }
771                 }
772
773                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
774                         wdev->conn->auto_auth = true;
775                         /* start with open system ... should mostly work */
776                         wdev->conn->params.auth_type =
777                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
778                 } else {
779                         wdev->conn->auto_auth = false;
780                 }
781
782                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
783                 wdev->ssid_len = connect->ssid_len;
784                 wdev->conn->params.ssid = wdev->ssid;
785                 wdev->conn->params.ssid_len = connect->ssid_len;
786
787                 /* see if we have the bss already */
788                 bss = cfg80211_get_conn_bss(wdev);
789
790                 wdev->sme_state = CFG80211_SME_CONNECTING;
791                 wdev->connect_keys = connkeys;
792
793                 if (prev_bssid) {
794                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
795                         wdev->conn->prev_bssid_valid = true;
796                 }
797
798                 /* we're good if we have a matching bss struct */
799                 if (bss) {
800                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
801                         err = cfg80211_conn_do_work(wdev);
802                         cfg80211_put_bss(bss);
803                 } else {
804                         /* otherwise we'll need to scan for the AP first */
805                         err = cfg80211_conn_scan(wdev);
806                         /*
807                          * If we can't scan right now, then we need to scan again
808                          * after the current scan finished, since the parameters
809                          * changed (unless we find a good AP anyway).
810                          */
811                         if (err == -EBUSY) {
812                                 err = 0;
813                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
814                         }
815                 }
816                 if (err) {
817                         kfree(wdev->conn->ie);
818                         kfree(wdev->conn);
819                         wdev->conn = NULL;
820                         wdev->sme_state = CFG80211_SME_IDLE;
821                         wdev->connect_keys = NULL;
822                         wdev->ssid_len = 0;
823                 }
824
825                 return err;
826         } else {
827                 wdev->sme_state = CFG80211_SME_CONNECTING;
828                 wdev->connect_keys = connkeys;
829                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
830                 if (err) {
831                         wdev->connect_keys = NULL;
832                         wdev->sme_state = CFG80211_SME_IDLE;
833                         return err;
834                 }
835
836                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
837                 wdev->ssid_len = connect->ssid_len;
838
839                 return 0;
840         }
841 }
842
843 int cfg80211_connect(struct cfg80211_registered_device *rdev,
844                      struct net_device *dev,
845                      struct cfg80211_connect_params *connect,
846                      struct cfg80211_cached_keys *connkeys)
847 {
848         int err;
849
850         mutex_lock(&rdev->devlist_mtx);
851         wdev_lock(dev->ieee80211_ptr);
852         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
853         wdev_unlock(dev->ieee80211_ptr);
854         mutex_unlock(&rdev->devlist_mtx);
855
856         return err;
857 }
858
859 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
860                           struct net_device *dev, u16 reason, bool wextev)
861 {
862         struct wireless_dev *wdev = dev->ieee80211_ptr;
863         int err;
864
865         ASSERT_WDEV_LOCK(wdev);
866
867         if (wdev->sme_state == CFG80211_SME_IDLE)
868                 return -EINVAL;
869
870         kfree(wdev->connect_keys);
871         wdev->connect_keys = NULL;
872
873         if (!rdev->ops->disconnect) {
874                 if (!rdev->ops->deauth)
875                         return -EOPNOTSUPP;
876
877                 /* was it connected by userspace SME? */
878                 if (!wdev->conn) {
879                         cfg80211_mlme_down(rdev, dev);
880                         return 0;
881                 }
882
883                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
884                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
885                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
886                         wdev->sme_state = CFG80211_SME_IDLE;
887                         kfree(wdev->conn->ie);
888                         kfree(wdev->conn);
889                         wdev->conn = NULL;
890                         wdev->ssid_len = 0;
891                         return 0;
892                 }
893
894                 /* wdev->conn->params.bssid must be set if > SCANNING */
895                 err = __cfg80211_mlme_deauth(rdev, dev,
896                                              wdev->conn->params.bssid,
897                                              NULL, 0, reason);
898                 if (err)
899                         return err;
900         } else {
901                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
902                 if (err)
903                         return err;
904         }
905
906         if (wdev->sme_state == CFG80211_SME_CONNECTED)
907                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
908         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
909                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
910                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
911                                           wextev, NULL);
912
913         return 0;
914 }
915
916 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
917                         struct net_device *dev,
918                         u16 reason, bool wextev)
919 {
920         int err;
921
922         wdev_lock(dev->ieee80211_ptr);
923         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
924         wdev_unlock(dev->ieee80211_ptr);
925
926         return err;
927 }
928
929 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
930 {
931         struct wireless_dev *wdev = dev->ieee80211_ptr;
932         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
933         u8 bssid[ETH_ALEN];
934
935         ASSERT_WDEV_LOCK(wdev);
936
937         if (!wdev->conn)
938                 return;
939
940         if (wdev->conn->state == CFG80211_CONN_IDLE)
941                 return;
942
943         /*
944          * Ok, so the association was made by this SME -- we don't
945          * want it any more so deauthenticate too.
946          */
947
948         if (!wdev->auth_bsses[idx])
949                 return;
950
951         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
952         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
953                                    NULL, 0, WLAN_REASON_DEAUTH_LEAVING)) {
954                 /* whatever -- assume gone anyway */
955                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
956                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
957                 wdev->auth_bsses[idx] = NULL;
958         }
959 }