93c3ed329204f034c18a1ec08b9d54bb75364abe
[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         } state;
30         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
31         u8 *ie;
32         size_t ie_len;
33         bool auto_auth, prev_bssid_valid;
34 };
35
36
37 static int cfg80211_conn_scan(struct wireless_dev *wdev)
38 {
39         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
40         struct cfg80211_scan_request *request;
41         int n_channels, err;
42
43         ASSERT_RTNL();
44         ASSERT_RDEV_LOCK(rdev);
45         ASSERT_WDEV_LOCK(wdev);
46
47         if (rdev->scan_req)
48                 return -EBUSY;
49
50         if (wdev->conn->params.channel) {
51                 n_channels = 1;
52         } else {
53                 enum ieee80211_band band;
54                 n_channels = 0;
55
56                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
57                         if (!wdev->wiphy->bands[band])
58                                 continue;
59                         n_channels += wdev->wiphy->bands[band]->n_channels;
60                 }
61         }
62         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
63                           sizeof(request->channels[0]) * n_channels,
64                           GFP_KERNEL);
65         if (!request)
66                 return -ENOMEM;
67
68         if (wdev->conn->params.channel)
69                 request->channels[0] = wdev->conn->params.channel;
70         else {
71                 int i = 0, j;
72                 enum ieee80211_band band;
73
74                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
75                         if (!wdev->wiphy->bands[band])
76                                 continue;
77                         for (j = 0; j < wdev->wiphy->bands[band]->n_channels;
78                              i++, j++)
79                                 request->channels[i] =
80                                         &wdev->wiphy->bands[band]->channels[j];
81                 }
82         }
83         request->n_channels = n_channels;
84         request->ssids = (void *)&request->channels[n_channels];
85         request->n_ssids = 1;
86
87         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
88                 wdev->conn->params.ssid_len);
89         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
90
91         request->dev = wdev->netdev;
92         request->wiphy = &rdev->wiphy;
93
94         rdev->scan_req = request;
95
96         err = rdev->ops->scan(wdev->wiphy, wdev->netdev, request);
97         if (!err) {
98                 wdev->conn->state = CFG80211_CONN_SCANNING;
99                 nl80211_send_scan_start(rdev, wdev->netdev);
100                 dev_hold(wdev->netdev);
101         } else {
102                 rdev->scan_req = NULL;
103                 kfree(request);
104         }
105         return err;
106 }
107
108 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
109 {
110         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
111         struct cfg80211_connect_params *params;
112         const u8 *prev_bssid = NULL;
113         int err;
114
115         ASSERT_WDEV_LOCK(wdev);
116
117         if (!wdev->conn)
118                 return 0;
119
120         params = &wdev->conn->params;
121
122         switch (wdev->conn->state) {
123         case CFG80211_CONN_SCAN_AGAIN:
124                 return cfg80211_conn_scan(wdev);
125         case CFG80211_CONN_AUTHENTICATE_NEXT:
126                 BUG_ON(!rdev->ops->auth);
127                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
128                 return __cfg80211_mlme_auth(rdev, wdev->netdev,
129                                             params->channel, params->auth_type,
130                                             params->bssid,
131                                             params->ssid, params->ssid_len,
132                                             NULL, 0,
133                                             params->key, params->key_len,
134                                             params->key_idx);
135         case CFG80211_CONN_ASSOCIATE_NEXT:
136                 BUG_ON(!rdev->ops->assoc);
137                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
138                 if (wdev->conn->prev_bssid_valid)
139                         prev_bssid = wdev->conn->prev_bssid;
140                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev,
141                                             params->channel, params->bssid,
142                                             prev_bssid,
143                                             params->ssid, params->ssid_len,
144                                             params->ie, params->ie_len,
145                                             false, &params->crypto);
146                 if (err)
147                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
148                                                NULL, 0,
149                                                WLAN_REASON_DEAUTH_LEAVING);
150                 return err;
151         default:
152                 return 0;
153         }
154 }
155
156 void cfg80211_conn_work(struct work_struct *work)
157 {
158         struct cfg80211_registered_device *rdev =
159                 container_of(work, struct cfg80211_registered_device, conn_work);
160         struct wireless_dev *wdev;
161
162         rtnl_lock();
163         cfg80211_lock_rdev(rdev);
164         mutex_lock(&rdev->devlist_mtx);
165
166         list_for_each_entry(wdev, &rdev->netdev_list, list) {
167                 wdev_lock(wdev);
168                 if (!netif_running(wdev->netdev)) {
169                         wdev_unlock(wdev);
170                         continue;
171                 }
172                 if (wdev->sme_state != CFG80211_SME_CONNECTING) {
173                         wdev_unlock(wdev);
174                         continue;
175                 }
176                 if (cfg80211_conn_do_work(wdev))
177                         __cfg80211_connect_result(
178                                         wdev->netdev,
179                                         wdev->conn->params.bssid,
180                                         NULL, 0, NULL, 0,
181                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
182                                         false, NULL);
183                 wdev_unlock(wdev);
184         }
185
186         mutex_unlock(&rdev->devlist_mtx);
187         cfg80211_unlock_rdev(rdev);
188         rtnl_unlock();
189 }
190
191 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
192 {
193         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
194         struct cfg80211_bss *bss;
195         u16 capa = WLAN_CAPABILITY_ESS;
196
197         ASSERT_WDEV_LOCK(wdev);
198
199         if (wdev->conn->params.privacy)
200                 capa |= WLAN_CAPABILITY_PRIVACY;
201
202         bss = cfg80211_get_bss(wdev->wiphy, NULL, wdev->conn->params.bssid,
203                                wdev->conn->params.ssid,
204                                wdev->conn->params.ssid_len,
205                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
206                                capa);
207         if (!bss)
208                 return NULL;
209
210         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
211         wdev->conn->params.bssid = wdev->conn->bssid;
212         wdev->conn->params.channel = bss->channel;
213         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
214         schedule_work(&rdev->conn_work);
215
216         return bss;
217 }
218
219 static void __cfg80211_sme_scan_done(struct net_device *dev)
220 {
221         struct wireless_dev *wdev = dev->ieee80211_ptr;
222         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
223         struct cfg80211_bss *bss;
224
225         ASSERT_WDEV_LOCK(wdev);
226
227         if (wdev->sme_state != CFG80211_SME_CONNECTING)
228                 return;
229
230         if (!wdev->conn)
231                 return;
232
233         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
234             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
235                 return;
236
237         bss = cfg80211_get_conn_bss(wdev);
238         if (bss) {
239                 cfg80211_put_bss(bss);
240         } else {
241                 /* not found */
242                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
243                         schedule_work(&rdev->conn_work);
244                 else
245                         __cfg80211_connect_result(
246                                         wdev->netdev,
247                                         wdev->conn->params.bssid,
248                                         NULL, 0, NULL, 0,
249                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
250                                         false, NULL);
251         }
252 }
253
254 void cfg80211_sme_scan_done(struct net_device *dev)
255 {
256         struct wireless_dev *wdev = dev->ieee80211_ptr;
257
258         mutex_lock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
259         wdev_lock(wdev);
260         __cfg80211_sme_scan_done(dev);
261         wdev_unlock(wdev);
262         mutex_unlock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
263 }
264
265 void cfg80211_sme_rx_auth(struct net_device *dev,
266                           const u8 *buf, size_t len)
267 {
268         struct wireless_dev *wdev = dev->ieee80211_ptr;
269         struct wiphy *wiphy = wdev->wiphy;
270         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
271         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
272         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
273
274         ASSERT_WDEV_LOCK(wdev);
275
276         /* should only RX auth frames when connecting */
277         if (wdev->sme_state != CFG80211_SME_CONNECTING)
278                 return;
279
280         if (WARN_ON(!wdev->conn))
281                 return;
282
283         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
284             wdev->conn->auto_auth &&
285             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
286                 /* select automatically between only open, shared, leap */
287                 switch (wdev->conn->params.auth_type) {
288                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
289                         if (wdev->connect_keys)
290                                 wdev->conn->params.auth_type =
291                                         NL80211_AUTHTYPE_SHARED_KEY;
292                         else
293                                 wdev->conn->params.auth_type =
294                                         NL80211_AUTHTYPE_NETWORK_EAP;
295                         break;
296                 case NL80211_AUTHTYPE_SHARED_KEY:
297                         wdev->conn->params.auth_type =
298                                 NL80211_AUTHTYPE_NETWORK_EAP;
299                         break;
300                 default:
301                         /* huh? */
302                         wdev->conn->params.auth_type =
303                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
304                         break;
305                 }
306                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
307                 schedule_work(&rdev->conn_work);
308         } else if (status_code != WLAN_STATUS_SUCCESS) {
309                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
310                                           status_code, false, NULL);
311         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
312                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
313                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
314                 schedule_work(&rdev->conn_work);
315         }
316 }
317
318 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev)
319 {
320         struct wiphy *wiphy = wdev->wiphy;
321         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
322
323         if (WARN_ON(!wdev->conn))
324                 return false;
325
326         if (!wdev->conn->prev_bssid_valid)
327                 return false;
328
329         /*
330          * Some stupid APs don't accept reassoc, so we
331          * need to fall back to trying regular assoc.
332          */
333         wdev->conn->prev_bssid_valid = false;
334         wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
335         schedule_work(&rdev->conn_work);
336
337         return true;
338 }
339
340 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
341                                const u8 *req_ie, size_t req_ie_len,
342                                const u8 *resp_ie, size_t resp_ie_len,
343                                u16 status, bool wextev,
344                                struct cfg80211_bss *bss)
345 {
346         struct wireless_dev *wdev = dev->ieee80211_ptr;
347         u8 *country_ie;
348 #ifdef CONFIG_WIRELESS_EXT
349         union iwreq_data wrqu;
350 #endif
351
352         ASSERT_WDEV_LOCK(wdev);
353
354         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
355                 return;
356
357         if (wdev->sme_state != CFG80211_SME_CONNECTING)
358                 return;
359
360         nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
361                                     bssid, req_ie, req_ie_len,
362                                     resp_ie, resp_ie_len,
363                                     status, GFP_KERNEL);
364
365 #ifdef CONFIG_WIRELESS_EXT
366         if (wextev) {
367                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
368                         memset(&wrqu, 0, sizeof(wrqu));
369                         wrqu.data.length = req_ie_len;
370                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
371                 }
372
373                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
374                         memset(&wrqu, 0, sizeof(wrqu));
375                         wrqu.data.length = resp_ie_len;
376                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
377                 }
378
379                 memset(&wrqu, 0, sizeof(wrqu));
380                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
381                 if (bssid && status == WLAN_STATUS_SUCCESS) {
382                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
383                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
384                         wdev->wext.prev_bssid_valid = true;
385                 }
386                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
387         }
388 #endif
389
390         if (wdev->current_bss) {
391                 cfg80211_unhold_bss(wdev->current_bss);
392                 cfg80211_put_bss(&wdev->current_bss->pub);
393                 wdev->current_bss = NULL;
394         }
395
396         if (wdev->conn)
397                 wdev->conn->state = CFG80211_CONN_IDLE;
398
399         if (status != WLAN_STATUS_SUCCESS) {
400                 wdev->sme_state = CFG80211_SME_IDLE;
401                 if (wdev->conn)
402                         kfree(wdev->conn->ie);
403                 kfree(wdev->conn);
404                 wdev->conn = NULL;
405                 kfree(wdev->connect_keys);
406                 wdev->connect_keys = NULL;
407                 wdev->ssid_len = 0;
408                 return;
409         }
410
411         if (!bss)
412                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
413                                        wdev->ssid, wdev->ssid_len,
414                                        WLAN_CAPABILITY_ESS,
415                                        WLAN_CAPABILITY_ESS);
416
417         if (WARN_ON(!bss))
418                 return;
419
420         cfg80211_hold_bss(bss_from_pub(bss));
421         wdev->current_bss = bss_from_pub(bss);
422
423         wdev->sme_state = CFG80211_SME_CONNECTED;
424         cfg80211_upload_connect_keys(wdev);
425
426         country_ie = (u8 *) ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
427
428         if (!country_ie)
429                 return;
430
431         /*
432          * ieee80211_bss_get_ie() ensures we can access:
433          * - country_ie + 2, the start of the country ie data, and
434          * - and country_ie[1] which is the IE length
435          */
436         regulatory_hint_11d(wdev->wiphy,
437                             country_ie + 2,
438                             country_ie[1]);
439 }
440
441 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
442                              const u8 *req_ie, size_t req_ie_len,
443                              const u8 *resp_ie, size_t resp_ie_len,
444                              u16 status, gfp_t gfp)
445 {
446         struct wireless_dev *wdev = dev->ieee80211_ptr;
447         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
448         struct cfg80211_event *ev;
449         unsigned long flags;
450
451         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
452
453         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
454         if (!ev)
455                 return;
456
457         ev->type = EVENT_CONNECT_RESULT;
458         if (bssid)
459                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
460         ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
461         ev->cr.req_ie_len = req_ie_len;
462         memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
463         ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
464         ev->cr.resp_ie_len = resp_ie_len;
465         memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
466         ev->cr.status = status;
467
468         spin_lock_irqsave(&wdev->event_lock, flags);
469         list_add_tail(&ev->list, &wdev->event_list);
470         spin_unlock_irqrestore(&wdev->event_lock, flags);
471         schedule_work(&rdev->event_work);
472 }
473 EXPORT_SYMBOL(cfg80211_connect_result);
474
475 void __cfg80211_roamed(struct wireless_dev *wdev, const u8 *bssid,
476                        const u8 *req_ie, size_t req_ie_len,
477                        const u8 *resp_ie, size_t resp_ie_len)
478 {
479         struct cfg80211_bss *bss;
480 #ifdef CONFIG_WIRELESS_EXT
481         union iwreq_data wrqu;
482 #endif
483
484         ASSERT_WDEV_LOCK(wdev);
485
486         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
487                 return;
488
489         if (wdev->sme_state != CFG80211_SME_CONNECTED)
490                 return;
491
492         /* internal error -- how did we get to CONNECTED w/o BSS? */
493         if (WARN_ON(!wdev->current_bss)) {
494                 return;
495         }
496
497         cfg80211_unhold_bss(wdev->current_bss);
498         cfg80211_put_bss(&wdev->current_bss->pub);
499         wdev->current_bss = NULL;
500
501         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
502                                wdev->ssid, wdev->ssid_len,
503                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
504
505         if (WARN_ON(!bss))
506                 return;
507
508         cfg80211_hold_bss(bss_from_pub(bss));
509         wdev->current_bss = bss_from_pub(bss);
510
511         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bssid,
512                             req_ie, req_ie_len, resp_ie, resp_ie_len,
513                             GFP_KERNEL);
514
515 #ifdef CONFIG_WIRELESS_EXT
516         if (req_ie) {
517                 memset(&wrqu, 0, sizeof(wrqu));
518                 wrqu.data.length = req_ie_len;
519                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
520                                     &wrqu, req_ie);
521         }
522
523         if (resp_ie) {
524                 memset(&wrqu, 0, sizeof(wrqu));
525                 wrqu.data.length = resp_ie_len;
526                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
527                                     &wrqu, resp_ie);
528         }
529
530         memset(&wrqu, 0, sizeof(wrqu));
531         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
532         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
533         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
534         wdev->wext.prev_bssid_valid = true;
535         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
536 #endif
537 }
538
539 void cfg80211_roamed(struct net_device *dev, const u8 *bssid,
540                      const u8 *req_ie, size_t req_ie_len,
541                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
542 {
543         struct wireless_dev *wdev = dev->ieee80211_ptr;
544         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
545         struct cfg80211_event *ev;
546         unsigned long flags;
547
548         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
549
550         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
551         if (!ev)
552                 return;
553
554         ev->type = EVENT_ROAMED;
555         memcpy(ev->rm.bssid, bssid, ETH_ALEN);
556         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
557         ev->rm.req_ie_len = req_ie_len;
558         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
559         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
560         ev->rm.resp_ie_len = resp_ie_len;
561         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
562
563         spin_lock_irqsave(&wdev->event_lock, flags);
564         list_add_tail(&ev->list, &wdev->event_list);
565         spin_unlock_irqrestore(&wdev->event_lock, flags);
566         schedule_work(&rdev->event_work);
567 }
568 EXPORT_SYMBOL(cfg80211_roamed);
569
570 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
571                              size_t ie_len, u16 reason, bool from_ap)
572 {
573         struct wireless_dev *wdev = dev->ieee80211_ptr;
574         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
575         int i;
576 #ifdef CONFIG_WIRELESS_EXT
577         union iwreq_data wrqu;
578 #endif
579
580         ASSERT_WDEV_LOCK(wdev);
581
582         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
583                 return;
584
585         if (wdev->sme_state != CFG80211_SME_CONNECTED)
586                 return;
587
588         if (wdev->current_bss) {
589                 cfg80211_unhold_bss(wdev->current_bss);
590                 cfg80211_put_bss(&wdev->current_bss->pub);
591         }
592
593         wdev->current_bss = NULL;
594         wdev->sme_state = CFG80211_SME_IDLE;
595         wdev->ssid_len = 0;
596
597         if (wdev->conn) {
598                 const u8 *bssid;
599                 int ret;
600
601                 kfree(wdev->conn->ie);
602                 wdev->conn->ie = NULL;
603                 kfree(wdev->conn);
604                 wdev->conn = NULL;
605
606                 /*
607                  * If this disconnect was due to a disassoc, we
608                  * we might still have an auth BSS around. For
609                  * the userspace SME that's currently expected,
610                  * but for the kernel SME (nl80211 CONNECT or
611                  * wireless extensions) we want to clear up all
612                  * state.
613                  */
614                 for (i = 0; i < MAX_AUTH_BSSES; i++) {
615                         if (!wdev->auth_bsses[i])
616                                 continue;
617                         bssid = wdev->auth_bsses[i]->pub.bssid;
618                         ret = __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
619                                                 WLAN_REASON_DEAUTH_LEAVING);
620                         WARN(ret, "deauth failed: %d\n", ret);
621                 }
622         }
623
624         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
625
626         /*
627          * Delete all the keys ... pairwise keys can't really
628          * exist any more anyway, but default keys might.
629          */
630         if (rdev->ops->del_key)
631                 for (i = 0; i < 6; i++)
632                         rdev->ops->del_key(wdev->wiphy, dev, i, NULL);
633
634 #ifdef CONFIG_WIRELESS_EXT
635         memset(&wrqu, 0, sizeof(wrqu));
636         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
637         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
638 #endif
639 }
640
641 void cfg80211_disconnected(struct net_device *dev, u16 reason,
642                            u8 *ie, size_t ie_len, gfp_t gfp)
643 {
644         struct wireless_dev *wdev = dev->ieee80211_ptr;
645         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
646         struct cfg80211_event *ev;
647         unsigned long flags;
648
649         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
650
651         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
652         if (!ev)
653                 return;
654
655         ev->type = EVENT_DISCONNECTED;
656         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
657         ev->dc.ie_len = ie_len;
658         memcpy((void *)ev->dc.ie, ie, ie_len);
659         ev->dc.reason = reason;
660
661         spin_lock_irqsave(&wdev->event_lock, flags);
662         list_add_tail(&ev->list, &wdev->event_list);
663         spin_unlock_irqrestore(&wdev->event_lock, flags);
664         schedule_work(&rdev->event_work);
665 }
666 EXPORT_SYMBOL(cfg80211_disconnected);
667
668 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
669                        struct net_device *dev,
670                        struct cfg80211_connect_params *connect,
671                        struct cfg80211_cached_keys *connkeys,
672                        const u8 *prev_bssid)
673 {
674         struct wireless_dev *wdev = dev->ieee80211_ptr;
675         struct ieee80211_channel *chan;
676         struct cfg80211_bss *bss = NULL;
677         int err;
678
679         ASSERT_WDEV_LOCK(wdev);
680
681         if (wdev->sme_state != CFG80211_SME_IDLE)
682                 return -EALREADY;
683
684         chan = rdev_fixed_channel(rdev, wdev);
685         if (chan && chan != connect->channel)
686                 return -EBUSY;
687
688         if (WARN_ON(wdev->connect_keys)) {
689                 kfree(wdev->connect_keys);
690                 wdev->connect_keys = NULL;
691         }
692
693         if (connkeys && connkeys->def >= 0) {
694                 int idx;
695                 u32 cipher;
696
697                 idx = connkeys->def;
698                 cipher = connkeys->params[idx].cipher;
699                 /* If given a WEP key we may need it for shared key auth */
700                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
701                     cipher == WLAN_CIPHER_SUITE_WEP104) {
702                         connect->key_idx = idx;
703                         connect->key = connkeys->params[idx].key;
704                         connect->key_len = connkeys->params[idx].key_len;
705
706                         /*
707                          * If ciphers are not set (e.g. when going through
708                          * iwconfig), we have to set them appropriately here.
709                          */
710                         if (connect->crypto.cipher_group == 0)
711                                 connect->crypto.cipher_group = cipher;
712
713                         if (connect->crypto.n_ciphers_pairwise == 0) {
714                                 connect->crypto.n_ciphers_pairwise = 1;
715                                 connect->crypto.ciphers_pairwise[0] = cipher;
716                         }
717                 }
718         }
719
720         if (!rdev->ops->connect) {
721                 if (!rdev->ops->auth || !rdev->ops->assoc)
722                         return -EOPNOTSUPP;
723
724                 if (WARN_ON(wdev->conn))
725                         return -EINPROGRESS;
726
727                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
728                 if (!wdev->conn)
729                         return -ENOMEM;
730
731                 /*
732                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
733                  */
734                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
735                 if (connect->bssid) {
736                         wdev->conn->params.bssid = wdev->conn->bssid;
737                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
738                 }
739
740                 if (connect->ie) {
741                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
742                                                 GFP_KERNEL);
743                         wdev->conn->params.ie = wdev->conn->ie;
744                         if (!wdev->conn->ie) {
745                                 kfree(wdev->conn);
746                                 wdev->conn = NULL;
747                                 return -ENOMEM;
748                         }
749                 }
750
751                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
752                         wdev->conn->auto_auth = true;
753                         /* start with open system ... should mostly work */
754                         wdev->conn->params.auth_type =
755                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
756                 } else {
757                         wdev->conn->auto_auth = false;
758                 }
759
760                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
761                 wdev->ssid_len = connect->ssid_len;
762                 wdev->conn->params.ssid = wdev->ssid;
763                 wdev->conn->params.ssid_len = connect->ssid_len;
764
765                 /* see if we have the bss already */
766                 bss = cfg80211_get_conn_bss(wdev);
767
768                 wdev->sme_state = CFG80211_SME_CONNECTING;
769                 wdev->connect_keys = connkeys;
770
771                 if (prev_bssid) {
772                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
773                         wdev->conn->prev_bssid_valid = true;
774                 }
775
776                 /* we're good if we have a matching bss struct */
777                 if (bss) {
778                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
779                         err = cfg80211_conn_do_work(wdev);
780                         cfg80211_put_bss(bss);
781                 } else {
782                         /* otherwise we'll need to scan for the AP first */
783                         err = cfg80211_conn_scan(wdev);
784                         /*
785                          * If we can't scan right now, then we need to scan again
786                          * after the current scan finished, since the parameters
787                          * changed (unless we find a good AP anyway).
788                          */
789                         if (err == -EBUSY) {
790                                 err = 0;
791                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
792                         }
793                 }
794                 if (err) {
795                         kfree(wdev->conn->ie);
796                         kfree(wdev->conn);
797                         wdev->conn = NULL;
798                         wdev->sme_state = CFG80211_SME_IDLE;
799                         wdev->connect_keys = NULL;
800                         wdev->ssid_len = 0;
801                 }
802
803                 return err;
804         } else {
805                 wdev->sme_state = CFG80211_SME_CONNECTING;
806                 wdev->connect_keys = connkeys;
807                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
808                 if (err) {
809                         wdev->connect_keys = NULL;
810                         wdev->sme_state = CFG80211_SME_IDLE;
811                         return err;
812                 }
813
814                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
815                 wdev->ssid_len = connect->ssid_len;
816
817                 return 0;
818         }
819 }
820
821 int cfg80211_connect(struct cfg80211_registered_device *rdev,
822                      struct net_device *dev,
823                      struct cfg80211_connect_params *connect,
824                      struct cfg80211_cached_keys *connkeys)
825 {
826         int err;
827
828         mutex_lock(&rdev->devlist_mtx);
829         wdev_lock(dev->ieee80211_ptr);
830         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
831         wdev_unlock(dev->ieee80211_ptr);
832         mutex_unlock(&rdev->devlist_mtx);
833
834         return err;
835 }
836
837 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
838                           struct net_device *dev, u16 reason, bool wextev)
839 {
840         struct wireless_dev *wdev = dev->ieee80211_ptr;
841         int err;
842
843         ASSERT_WDEV_LOCK(wdev);
844
845         if (wdev->sme_state == CFG80211_SME_IDLE)
846                 return -EINVAL;
847
848         kfree(wdev->connect_keys);
849         wdev->connect_keys = NULL;
850
851         if (!rdev->ops->disconnect) {
852                 if (!rdev->ops->deauth)
853                         return -EOPNOTSUPP;
854
855                 /* was it connected by userspace SME? */
856                 if (!wdev->conn) {
857                         cfg80211_mlme_down(rdev, dev);
858                         return 0;
859                 }
860
861                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
862                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
863                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
864                         wdev->sme_state = CFG80211_SME_IDLE;
865                         kfree(wdev->conn->ie);
866                         kfree(wdev->conn);
867                         wdev->conn = NULL;
868                         wdev->ssid_len = 0;
869                         return 0;
870                 }
871
872                 /* wdev->conn->params.bssid must be set if > SCANNING */
873                 err = __cfg80211_mlme_deauth(rdev, dev,
874                                              wdev->conn->params.bssid,
875                                              NULL, 0, reason);
876                 if (err)
877                         return err;
878         } else {
879                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
880                 if (err)
881                         return err;
882         }
883
884         if (wdev->sme_state == CFG80211_SME_CONNECTED)
885                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
886         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
887                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
888                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
889                                           wextev, NULL);
890
891         return 0;
892 }
893
894 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
895                         struct net_device *dev,
896                         u16 reason, bool wextev)
897 {
898         int err;
899
900         wdev_lock(dev->ieee80211_ptr);
901         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
902         wdev_unlock(dev->ieee80211_ptr);
903
904         return err;
905 }
906
907 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
908 {
909         struct wireless_dev *wdev = dev->ieee80211_ptr;
910         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
911         u8 bssid[ETH_ALEN];
912
913         ASSERT_WDEV_LOCK(wdev);
914
915         if (!wdev->conn)
916                 return;
917
918         if (wdev->conn->state == CFG80211_CONN_IDLE)
919                 return;
920
921         /*
922          * Ok, so the association was made by this SME -- we don't
923          * want it any more so deauthenticate too.
924          */
925
926         if (!wdev->auth_bsses[idx])
927                 return;
928
929         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
930         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
931                                    NULL, 0, WLAN_REASON_DEAUTH_LEAVING)) {
932                 /* whatever -- assume gone anyway */
933                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
934                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
935                 wdev->auth_bsses[idx] = NULL;
936         }
937 }