Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[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/slab.h>
11 #include <linux/workqueue.h>
12 #include <linux/wireless.h>
13 #include <net/iw_handler.h>
14 #include <net/cfg80211.h>
15 #include <net/rtnetlink.h>
16 #include "nl80211.h"
17 #include "reg.h"
18
19 struct cfg80211_conn {
20         struct cfg80211_connect_params params;
21         /* these are sub-states of the _CONNECTING sme_state */
22         enum {
23                 CFG80211_CONN_IDLE,
24                 CFG80211_CONN_SCANNING,
25                 CFG80211_CONN_SCAN_AGAIN,
26                 CFG80211_CONN_AUTHENTICATE_NEXT,
27                 CFG80211_CONN_AUTHENTICATING,
28                 CFG80211_CONN_ASSOCIATE_NEXT,
29                 CFG80211_CONN_ASSOCIATING,
30                 CFG80211_CONN_DEAUTH_ASSOC_FAIL,
31         } state;
32         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
33         u8 *ie;
34         size_t ie_len;
35         bool auto_auth, prev_bssid_valid;
36 };
37
38 static bool cfg80211_is_all_idle(void)
39 {
40         struct cfg80211_registered_device *rdev;
41         struct wireless_dev *wdev;
42         bool is_all_idle = true;
43
44         mutex_lock(&cfg80211_mutex);
45
46         /*
47          * All devices must be idle as otherwise if you are actively
48          * scanning some new beacon hints could be learned and would
49          * count as new regulatory hints.
50          */
51         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
52                 cfg80211_lock_rdev(rdev);
53                 list_for_each_entry(wdev, &rdev->netdev_list, list) {
54                         wdev_lock(wdev);
55                         if (wdev->sme_state != CFG80211_SME_IDLE)
56                                 is_all_idle = false;
57                         wdev_unlock(wdev);
58                 }
59                 cfg80211_unlock_rdev(rdev);
60         }
61
62         mutex_unlock(&cfg80211_mutex);
63
64         return is_all_idle;
65 }
66
67 static void disconnect_work(struct work_struct *work)
68 {
69         if (!cfg80211_is_all_idle())
70                 return;
71
72         regulatory_hint_disconnect();
73 }
74
75 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
76
77 static int cfg80211_conn_scan(struct wireless_dev *wdev)
78 {
79         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
80         struct cfg80211_scan_request *request;
81         int n_channels, err;
82
83         ASSERT_RTNL();
84         ASSERT_RDEV_LOCK(rdev);
85         ASSERT_WDEV_LOCK(wdev);
86
87         if (rdev->scan_req)
88                 return -EBUSY;
89
90         if (wdev->conn->params.channel) {
91                 n_channels = 1;
92         } else {
93                 enum ieee80211_band band;
94                 n_channels = 0;
95
96                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
97                         if (!wdev->wiphy->bands[band])
98                                 continue;
99                         n_channels += wdev->wiphy->bands[band]->n_channels;
100                 }
101         }
102         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
103                           sizeof(request->channels[0]) * n_channels,
104                           GFP_KERNEL);
105         if (!request)
106                 return -ENOMEM;
107
108         if (wdev->conn->params.channel)
109                 request->channels[0] = wdev->conn->params.channel;
110         else {
111                 int i = 0, j;
112                 enum ieee80211_band band;
113
114                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
115                         if (!wdev->wiphy->bands[band])
116                                 continue;
117                         for (j = 0; j < wdev->wiphy->bands[band]->n_channels;
118                              i++, j++)
119                                 request->channels[i] =
120                                         &wdev->wiphy->bands[band]->channels[j];
121                 }
122         }
123         request->n_channels = n_channels;
124         request->ssids = (void *)&request->channels[n_channels];
125         request->n_ssids = 1;
126
127         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
128                 wdev->conn->params.ssid_len);
129         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
130
131         request->dev = wdev->netdev;
132         request->wiphy = &rdev->wiphy;
133
134         rdev->scan_req = request;
135
136         err = rdev->ops->scan(wdev->wiphy, wdev->netdev, request);
137         if (!err) {
138                 wdev->conn->state = CFG80211_CONN_SCANNING;
139                 nl80211_send_scan_start(rdev, wdev->netdev);
140                 dev_hold(wdev->netdev);
141         } else {
142                 rdev->scan_req = NULL;
143                 kfree(request);
144         }
145         return err;
146 }
147
148 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
149 {
150         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
151         struct cfg80211_connect_params *params;
152         const u8 *prev_bssid = NULL;
153         int err;
154
155         ASSERT_WDEV_LOCK(wdev);
156
157         if (!wdev->conn)
158                 return 0;
159
160         params = &wdev->conn->params;
161
162         switch (wdev->conn->state) {
163         case CFG80211_CONN_SCAN_AGAIN:
164                 return cfg80211_conn_scan(wdev);
165         case CFG80211_CONN_AUTHENTICATE_NEXT:
166                 BUG_ON(!rdev->ops->auth);
167                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
168                 return __cfg80211_mlme_auth(rdev, wdev->netdev,
169                                             params->channel, params->auth_type,
170                                             params->bssid,
171                                             params->ssid, params->ssid_len,
172                                             NULL, 0,
173                                             params->key, params->key_len,
174                                             params->key_idx, false);
175         case CFG80211_CONN_ASSOCIATE_NEXT:
176                 BUG_ON(!rdev->ops->assoc);
177                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
178                 if (wdev->conn->prev_bssid_valid)
179                         prev_bssid = wdev->conn->prev_bssid;
180                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev,
181                                             params->channel, params->bssid,
182                                             prev_bssid,
183                                             params->ssid, params->ssid_len,
184                                             params->ie, params->ie_len,
185                                             false, &params->crypto);
186                 if (err)
187                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
188                                                NULL, 0,
189                                                WLAN_REASON_DEAUTH_LEAVING,
190                                                false);
191                 return err;
192         case CFG80211_CONN_DEAUTH_ASSOC_FAIL:
193                 __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
194                                        NULL, 0,
195                                        WLAN_REASON_DEAUTH_LEAVING, false);
196                 /* return an error so that we call __cfg80211_connect_result() */
197                 return -EINVAL;
198         default:
199                 return 0;
200         }
201 }
202
203 void cfg80211_conn_work(struct work_struct *work)
204 {
205         struct cfg80211_registered_device *rdev =
206                 container_of(work, struct cfg80211_registered_device, conn_work);
207         struct wireless_dev *wdev;
208         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
209
210         rtnl_lock();
211         cfg80211_lock_rdev(rdev);
212         mutex_lock(&rdev->devlist_mtx);
213
214         list_for_each_entry(wdev, &rdev->netdev_list, list) {
215                 wdev_lock(wdev);
216                 if (!netif_running(wdev->netdev)) {
217                         wdev_unlock(wdev);
218                         continue;
219                 }
220                 if (wdev->sme_state != CFG80211_SME_CONNECTING) {
221                         wdev_unlock(wdev);
222                         continue;
223                 }
224                 if (wdev->conn->params.bssid) {
225                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
226                         bssid = bssid_buf;
227                 }
228                 if (cfg80211_conn_do_work(wdev))
229                         __cfg80211_connect_result(
230                                         wdev->netdev, bssid,
231                                         NULL, 0, NULL, 0,
232                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
233                                         false, NULL);
234                 wdev_unlock(wdev);
235         }
236
237         mutex_unlock(&rdev->devlist_mtx);
238         cfg80211_unlock_rdev(rdev);
239         rtnl_unlock();
240 }
241
242 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
243 {
244         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
245         struct cfg80211_bss *bss;
246         u16 capa = WLAN_CAPABILITY_ESS;
247
248         ASSERT_WDEV_LOCK(wdev);
249
250         if (wdev->conn->params.privacy)
251                 capa |= WLAN_CAPABILITY_PRIVACY;
252
253         bss = cfg80211_get_bss(wdev->wiphy, NULL, wdev->conn->params.bssid,
254                                wdev->conn->params.ssid,
255                                wdev->conn->params.ssid_len,
256                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
257                                capa);
258         if (!bss)
259                 return NULL;
260
261         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
262         wdev->conn->params.bssid = wdev->conn->bssid;
263         wdev->conn->params.channel = bss->channel;
264         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
265         schedule_work(&rdev->conn_work);
266
267         return bss;
268 }
269
270 static void __cfg80211_sme_scan_done(struct net_device *dev)
271 {
272         struct wireless_dev *wdev = dev->ieee80211_ptr;
273         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
274         struct cfg80211_bss *bss;
275
276         ASSERT_WDEV_LOCK(wdev);
277
278         if (wdev->sme_state != CFG80211_SME_CONNECTING)
279                 return;
280
281         if (!wdev->conn)
282                 return;
283
284         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
285             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
286                 return;
287
288         bss = cfg80211_get_conn_bss(wdev);
289         if (bss) {
290                 cfg80211_put_bss(bss);
291         } else {
292                 /* not found */
293                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
294                         schedule_work(&rdev->conn_work);
295                 else
296                         __cfg80211_connect_result(
297                                         wdev->netdev,
298                                         wdev->conn->params.bssid,
299                                         NULL, 0, NULL, 0,
300                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
301                                         false, NULL);
302         }
303 }
304
305 void cfg80211_sme_scan_done(struct net_device *dev)
306 {
307         struct wireless_dev *wdev = dev->ieee80211_ptr;
308
309         mutex_lock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
310         wdev_lock(wdev);
311         __cfg80211_sme_scan_done(dev);
312         wdev_unlock(wdev);
313         mutex_unlock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
314 }
315
316 void cfg80211_sme_rx_auth(struct net_device *dev,
317                           const u8 *buf, size_t len)
318 {
319         struct wireless_dev *wdev = dev->ieee80211_ptr;
320         struct wiphy *wiphy = wdev->wiphy;
321         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
322         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
323         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
324
325         ASSERT_WDEV_LOCK(wdev);
326
327         /* should only RX auth frames when connecting */
328         if (wdev->sme_state != CFG80211_SME_CONNECTING)
329                 return;
330
331         if (WARN_ON(!wdev->conn))
332                 return;
333
334         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
335             wdev->conn->auto_auth &&
336             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
337                 /* select automatically between only open, shared, leap */
338                 switch (wdev->conn->params.auth_type) {
339                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
340                         if (wdev->connect_keys)
341                                 wdev->conn->params.auth_type =
342                                         NL80211_AUTHTYPE_SHARED_KEY;
343                         else
344                                 wdev->conn->params.auth_type =
345                                         NL80211_AUTHTYPE_NETWORK_EAP;
346                         break;
347                 case NL80211_AUTHTYPE_SHARED_KEY:
348                         wdev->conn->params.auth_type =
349                                 NL80211_AUTHTYPE_NETWORK_EAP;
350                         break;
351                 default:
352                         /* huh? */
353                         wdev->conn->params.auth_type =
354                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
355                         break;
356                 }
357                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
358                 schedule_work(&rdev->conn_work);
359         } else if (status_code != WLAN_STATUS_SUCCESS) {
360                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
361                                           status_code, false, NULL);
362         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
363                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
364                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
365                 schedule_work(&rdev->conn_work);
366         }
367 }
368
369 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev)
370 {
371         struct wiphy *wiphy = wdev->wiphy;
372         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
373
374         if (WARN_ON(!wdev->conn))
375                 return false;
376
377         if (!wdev->conn->prev_bssid_valid)
378                 return false;
379
380         /*
381          * Some stupid APs don't accept reassoc, so we
382          * need to fall back to trying regular assoc.
383          */
384         wdev->conn->prev_bssid_valid = false;
385         wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
386         schedule_work(&rdev->conn_work);
387
388         return true;
389 }
390
391 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev)
392 {
393         struct wiphy *wiphy = wdev->wiphy;
394         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
395
396         wdev->conn->state = CFG80211_CONN_DEAUTH_ASSOC_FAIL;
397         schedule_work(&rdev->conn_work);
398 }
399
400 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
401                                const u8 *req_ie, size_t req_ie_len,
402                                const u8 *resp_ie, size_t resp_ie_len,
403                                u16 status, bool wextev,
404                                struct cfg80211_bss *bss)
405 {
406         struct wireless_dev *wdev = dev->ieee80211_ptr;
407         u8 *country_ie;
408 #ifdef CONFIG_CFG80211_WEXT
409         union iwreq_data wrqu;
410 #endif
411
412         ASSERT_WDEV_LOCK(wdev);
413
414         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
415                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
416                 return;
417
418         if (wdev->sme_state != CFG80211_SME_CONNECTING)
419                 return;
420
421         nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
422                                     bssid, req_ie, req_ie_len,
423                                     resp_ie, resp_ie_len,
424                                     status, GFP_KERNEL);
425
426 #ifdef CONFIG_CFG80211_WEXT
427         if (wextev) {
428                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
429                         memset(&wrqu, 0, sizeof(wrqu));
430                         wrqu.data.length = req_ie_len;
431                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
432                 }
433
434                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
435                         memset(&wrqu, 0, sizeof(wrqu));
436                         wrqu.data.length = resp_ie_len;
437                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
438                 }
439
440                 memset(&wrqu, 0, sizeof(wrqu));
441                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
442                 if (bssid && status == WLAN_STATUS_SUCCESS) {
443                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
444                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
445                         wdev->wext.prev_bssid_valid = true;
446                 }
447                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
448         }
449 #endif
450
451         if (wdev->current_bss) {
452                 cfg80211_unhold_bss(wdev->current_bss);
453                 cfg80211_put_bss(&wdev->current_bss->pub);
454                 wdev->current_bss = NULL;
455         }
456
457         if (wdev->conn)
458                 wdev->conn->state = CFG80211_CONN_IDLE;
459
460         if (status != WLAN_STATUS_SUCCESS) {
461                 wdev->sme_state = CFG80211_SME_IDLE;
462                 if (wdev->conn)
463                         kfree(wdev->conn->ie);
464                 kfree(wdev->conn);
465                 wdev->conn = NULL;
466                 kfree(wdev->connect_keys);
467                 wdev->connect_keys = NULL;
468                 wdev->ssid_len = 0;
469                 return;
470         }
471
472         if (!bss)
473                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
474                                        wdev->ssid, wdev->ssid_len,
475                                        WLAN_CAPABILITY_ESS,
476                                        WLAN_CAPABILITY_ESS);
477
478         if (WARN_ON(!bss))
479                 return;
480
481         cfg80211_hold_bss(bss_from_pub(bss));
482         wdev->current_bss = bss_from_pub(bss);
483
484         wdev->sme_state = CFG80211_SME_CONNECTED;
485         cfg80211_upload_connect_keys(wdev);
486
487         country_ie = (u8 *) ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
488
489         if (!country_ie)
490                 return;
491
492         /*
493          * ieee80211_bss_get_ie() ensures we can access:
494          * - country_ie + 2, the start of the country ie data, and
495          * - and country_ie[1] which is the IE length
496          */
497         regulatory_hint_11d(wdev->wiphy,
498                             bss->channel->band,
499                             country_ie + 2,
500                             country_ie[1]);
501 }
502
503 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
504                              const u8 *req_ie, size_t req_ie_len,
505                              const u8 *resp_ie, size_t resp_ie_len,
506                              u16 status, gfp_t gfp)
507 {
508         struct wireless_dev *wdev = dev->ieee80211_ptr;
509         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
510         struct cfg80211_event *ev;
511         unsigned long flags;
512
513         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
514
515         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
516         if (!ev)
517                 return;
518
519         ev->type = EVENT_CONNECT_RESULT;
520         if (bssid)
521                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
522         if (req_ie_len) {
523                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
524                 ev->cr.req_ie_len = req_ie_len;
525                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
526         }
527         if (resp_ie_len) {
528                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
529                 ev->cr.resp_ie_len = resp_ie_len;
530                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
531         }
532         ev->cr.status = status;
533
534         spin_lock_irqsave(&wdev->event_lock, flags);
535         list_add_tail(&ev->list, &wdev->event_list);
536         spin_unlock_irqrestore(&wdev->event_lock, flags);
537         queue_work(cfg80211_wq, &rdev->event_work);
538 }
539 EXPORT_SYMBOL(cfg80211_connect_result);
540
541 void __cfg80211_roamed(struct wireless_dev *wdev, const u8 *bssid,
542                        const u8 *req_ie, size_t req_ie_len,
543                        const u8 *resp_ie, size_t resp_ie_len)
544 {
545         struct cfg80211_bss *bss;
546 #ifdef CONFIG_CFG80211_WEXT
547         union iwreq_data wrqu;
548 #endif
549
550         ASSERT_WDEV_LOCK(wdev);
551
552         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
553                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
554                 return;
555
556         if (wdev->sme_state != CFG80211_SME_CONNECTED)
557                 return;
558
559         /* internal error -- how did we get to CONNECTED w/o BSS? */
560         if (WARN_ON(!wdev->current_bss)) {
561                 return;
562         }
563
564         cfg80211_unhold_bss(wdev->current_bss);
565         cfg80211_put_bss(&wdev->current_bss->pub);
566         wdev->current_bss = NULL;
567
568         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
569                                wdev->ssid, wdev->ssid_len,
570                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
571
572         if (WARN_ON(!bss))
573                 return;
574
575         cfg80211_hold_bss(bss_from_pub(bss));
576         wdev->current_bss = bss_from_pub(bss);
577
578         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bssid,
579                             req_ie, req_ie_len, resp_ie, resp_ie_len,
580                             GFP_KERNEL);
581
582 #ifdef CONFIG_CFG80211_WEXT
583         if (req_ie) {
584                 memset(&wrqu, 0, sizeof(wrqu));
585                 wrqu.data.length = req_ie_len;
586                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
587                                     &wrqu, req_ie);
588         }
589
590         if (resp_ie) {
591                 memset(&wrqu, 0, sizeof(wrqu));
592                 wrqu.data.length = resp_ie_len;
593                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
594                                     &wrqu, resp_ie);
595         }
596
597         memset(&wrqu, 0, sizeof(wrqu));
598         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
599         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
600         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
601         wdev->wext.prev_bssid_valid = true;
602         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
603 #endif
604 }
605
606 void cfg80211_roamed(struct net_device *dev, const u8 *bssid,
607                      const u8 *req_ie, size_t req_ie_len,
608                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
609 {
610         struct wireless_dev *wdev = dev->ieee80211_ptr;
611         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
612         struct cfg80211_event *ev;
613         unsigned long flags;
614
615         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
616
617         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
618         if (!ev)
619                 return;
620
621         ev->type = EVENT_ROAMED;
622         memcpy(ev->rm.bssid, bssid, ETH_ALEN);
623         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
624         ev->rm.req_ie_len = req_ie_len;
625         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
626         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
627         ev->rm.resp_ie_len = resp_ie_len;
628         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
629
630         spin_lock_irqsave(&wdev->event_lock, flags);
631         list_add_tail(&ev->list, &wdev->event_list);
632         spin_unlock_irqrestore(&wdev->event_lock, flags);
633         queue_work(cfg80211_wq, &rdev->event_work);
634 }
635 EXPORT_SYMBOL(cfg80211_roamed);
636
637 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
638                              size_t ie_len, u16 reason, bool from_ap)
639 {
640         struct wireless_dev *wdev = dev->ieee80211_ptr;
641         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
642         int i;
643 #ifdef CONFIG_CFG80211_WEXT
644         union iwreq_data wrqu;
645 #endif
646
647         ASSERT_WDEV_LOCK(wdev);
648
649         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
650                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
651                 return;
652
653         if (wdev->sme_state != CFG80211_SME_CONNECTED)
654                 return;
655
656         if (wdev->current_bss) {
657                 cfg80211_unhold_bss(wdev->current_bss);
658                 cfg80211_put_bss(&wdev->current_bss->pub);
659         }
660
661         wdev->current_bss = NULL;
662         wdev->sme_state = CFG80211_SME_IDLE;
663         wdev->ssid_len = 0;
664
665         if (wdev->conn) {
666                 const u8 *bssid;
667                 int ret;
668
669                 kfree(wdev->conn->ie);
670                 wdev->conn->ie = NULL;
671                 kfree(wdev->conn);
672                 wdev->conn = NULL;
673
674                 /*
675                  * If this disconnect was due to a disassoc, we
676                  * we might still have an auth BSS around. For
677                  * the userspace SME that's currently expected,
678                  * but for the kernel SME (nl80211 CONNECT or
679                  * wireless extensions) we want to clear up all
680                  * state.
681                  */
682                 for (i = 0; i < MAX_AUTH_BSSES; i++) {
683                         if (!wdev->auth_bsses[i])
684                                 continue;
685                         bssid = wdev->auth_bsses[i]->pub.bssid;
686                         ret = __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
687                                                 WLAN_REASON_DEAUTH_LEAVING,
688                                                 false);
689                         WARN(ret, "deauth failed: %d\n", ret);
690                 }
691         }
692
693         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
694
695         /*
696          * Delete all the keys ... pairwise keys can't really
697          * exist any more anyway, but default keys might.
698          */
699         if (rdev->ops->del_key)
700                 for (i = 0; i < 6; i++)
701                         rdev->ops->del_key(wdev->wiphy, dev, i, false, NULL);
702
703 #ifdef CONFIG_CFG80211_WEXT
704         memset(&wrqu, 0, sizeof(wrqu));
705         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
706         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
707         wdev->wext.connect.ssid_len = 0;
708 #endif
709
710         schedule_work(&cfg80211_disconnect_work);
711 }
712
713 void cfg80211_disconnected(struct net_device *dev, u16 reason,
714                            u8 *ie, size_t ie_len, gfp_t gfp)
715 {
716         struct wireless_dev *wdev = dev->ieee80211_ptr;
717         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
718         struct cfg80211_event *ev;
719         unsigned long flags;
720
721         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
722
723         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
724         if (!ev)
725                 return;
726
727         ev->type = EVENT_DISCONNECTED;
728         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
729         ev->dc.ie_len = ie_len;
730         memcpy((void *)ev->dc.ie, ie, ie_len);
731         ev->dc.reason = reason;
732
733         spin_lock_irqsave(&wdev->event_lock, flags);
734         list_add_tail(&ev->list, &wdev->event_list);
735         spin_unlock_irqrestore(&wdev->event_lock, flags);
736         queue_work(cfg80211_wq, &rdev->event_work);
737 }
738 EXPORT_SYMBOL(cfg80211_disconnected);
739
740 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
741                        struct net_device *dev,
742                        struct cfg80211_connect_params *connect,
743                        struct cfg80211_cached_keys *connkeys,
744                        const u8 *prev_bssid)
745 {
746         struct wireless_dev *wdev = dev->ieee80211_ptr;
747         struct cfg80211_bss *bss = NULL;
748         int err;
749
750         ASSERT_WDEV_LOCK(wdev);
751
752         if (wdev->sme_state != CFG80211_SME_IDLE)
753                 return -EALREADY;
754
755         if (WARN_ON(wdev->connect_keys)) {
756                 kfree(wdev->connect_keys);
757                 wdev->connect_keys = NULL;
758         }
759
760         if (connkeys && connkeys->def >= 0) {
761                 int idx;
762                 u32 cipher;
763
764                 idx = connkeys->def;
765                 cipher = connkeys->params[idx].cipher;
766                 /* If given a WEP key we may need it for shared key auth */
767                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
768                     cipher == WLAN_CIPHER_SUITE_WEP104) {
769                         connect->key_idx = idx;
770                         connect->key = connkeys->params[idx].key;
771                         connect->key_len = connkeys->params[idx].key_len;
772
773                         /*
774                          * If ciphers are not set (e.g. when going through
775                          * iwconfig), we have to set them appropriately here.
776                          */
777                         if (connect->crypto.cipher_group == 0)
778                                 connect->crypto.cipher_group = cipher;
779
780                         if (connect->crypto.n_ciphers_pairwise == 0) {
781                                 connect->crypto.n_ciphers_pairwise = 1;
782                                 connect->crypto.ciphers_pairwise[0] = cipher;
783                         }
784                 }
785         }
786
787         if (!rdev->ops->connect) {
788                 if (!rdev->ops->auth || !rdev->ops->assoc)
789                         return -EOPNOTSUPP;
790
791                 if (WARN_ON(wdev->conn))
792                         return -EINPROGRESS;
793
794                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
795                 if (!wdev->conn)
796                         return -ENOMEM;
797
798                 /*
799                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
800                  */
801                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
802                 if (connect->bssid) {
803                         wdev->conn->params.bssid = wdev->conn->bssid;
804                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
805                 }
806
807                 if (connect->ie) {
808                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
809                                                 GFP_KERNEL);
810                         wdev->conn->params.ie = wdev->conn->ie;
811                         if (!wdev->conn->ie) {
812                                 kfree(wdev->conn);
813                                 wdev->conn = NULL;
814                                 return -ENOMEM;
815                         }
816                 }
817
818                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
819                         wdev->conn->auto_auth = true;
820                         /* start with open system ... should mostly work */
821                         wdev->conn->params.auth_type =
822                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
823                 } else {
824                         wdev->conn->auto_auth = false;
825                 }
826
827                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
828                 wdev->ssid_len = connect->ssid_len;
829                 wdev->conn->params.ssid = wdev->ssid;
830                 wdev->conn->params.ssid_len = connect->ssid_len;
831
832                 /* see if we have the bss already */
833                 bss = cfg80211_get_conn_bss(wdev);
834
835                 wdev->sme_state = CFG80211_SME_CONNECTING;
836                 wdev->connect_keys = connkeys;
837
838                 if (prev_bssid) {
839                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
840                         wdev->conn->prev_bssid_valid = true;
841                 }
842
843                 /* we're good if we have a matching bss struct */
844                 if (bss) {
845                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
846                         err = cfg80211_conn_do_work(wdev);
847                         cfg80211_put_bss(bss);
848                 } else {
849                         /* otherwise we'll need to scan for the AP first */
850                         err = cfg80211_conn_scan(wdev);
851                         /*
852                          * If we can't scan right now, then we need to scan again
853                          * after the current scan finished, since the parameters
854                          * changed (unless we find a good AP anyway).
855                          */
856                         if (err == -EBUSY) {
857                                 err = 0;
858                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
859                         }
860                 }
861                 if (err) {
862                         kfree(wdev->conn->ie);
863                         kfree(wdev->conn);
864                         wdev->conn = NULL;
865                         wdev->sme_state = CFG80211_SME_IDLE;
866                         wdev->connect_keys = NULL;
867                         wdev->ssid_len = 0;
868                 }
869
870                 return err;
871         } else {
872                 wdev->sme_state = CFG80211_SME_CONNECTING;
873                 wdev->connect_keys = connkeys;
874                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
875                 if (err) {
876                         wdev->connect_keys = NULL;
877                         wdev->sme_state = CFG80211_SME_IDLE;
878                         return err;
879                 }
880
881                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
882                 wdev->ssid_len = connect->ssid_len;
883
884                 return 0;
885         }
886 }
887
888 int cfg80211_connect(struct cfg80211_registered_device *rdev,
889                      struct net_device *dev,
890                      struct cfg80211_connect_params *connect,
891                      struct cfg80211_cached_keys *connkeys)
892 {
893         int err;
894
895         mutex_lock(&rdev->devlist_mtx);
896         wdev_lock(dev->ieee80211_ptr);
897         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
898         wdev_unlock(dev->ieee80211_ptr);
899         mutex_unlock(&rdev->devlist_mtx);
900
901         return err;
902 }
903
904 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
905                           struct net_device *dev, u16 reason, bool wextev)
906 {
907         struct wireless_dev *wdev = dev->ieee80211_ptr;
908         int err;
909
910         ASSERT_WDEV_LOCK(wdev);
911
912         if (wdev->sme_state == CFG80211_SME_IDLE)
913                 return -EINVAL;
914
915         kfree(wdev->connect_keys);
916         wdev->connect_keys = NULL;
917
918         if (!rdev->ops->disconnect) {
919                 if (!rdev->ops->deauth)
920                         return -EOPNOTSUPP;
921
922                 /* was it connected by userspace SME? */
923                 if (!wdev->conn) {
924                         cfg80211_mlme_down(rdev, dev);
925                         return 0;
926                 }
927
928                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
929                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
930                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
931                         wdev->sme_state = CFG80211_SME_IDLE;
932                         kfree(wdev->conn->ie);
933                         kfree(wdev->conn);
934                         wdev->conn = NULL;
935                         wdev->ssid_len = 0;
936                         return 0;
937                 }
938
939                 /* wdev->conn->params.bssid must be set if > SCANNING */
940                 err = __cfg80211_mlme_deauth(rdev, dev,
941                                              wdev->conn->params.bssid,
942                                              NULL, 0, reason, false);
943                 if (err)
944                         return err;
945         } else {
946                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
947                 if (err)
948                         return err;
949         }
950
951         if (wdev->sme_state == CFG80211_SME_CONNECTED)
952                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
953         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
954                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
955                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
956                                           wextev, NULL);
957
958         return 0;
959 }
960
961 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
962                         struct net_device *dev,
963                         u16 reason, bool wextev)
964 {
965         int err;
966
967         wdev_lock(dev->ieee80211_ptr);
968         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
969         wdev_unlock(dev->ieee80211_ptr);
970
971         return err;
972 }
973
974 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
975 {
976         struct wireless_dev *wdev = dev->ieee80211_ptr;
977         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
978         u8 bssid[ETH_ALEN];
979
980         ASSERT_WDEV_LOCK(wdev);
981
982         if (!wdev->conn)
983                 return;
984
985         if (wdev->conn->state == CFG80211_CONN_IDLE)
986                 return;
987
988         /*
989          * Ok, so the association was made by this SME -- we don't
990          * want it any more so deauthenticate too.
991          */
992
993         if (!wdev->auth_bsses[idx])
994                 return;
995
996         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
997         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
998                                    NULL, 0, WLAN_REASON_DEAUTH_LEAVING,
999                                    false)) {
1000                 /* whatever -- assume gone anyway */
1001                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
1002                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
1003                 wdev->auth_bsses[idx] = NULL;
1004         }
1005 }