blob: dc23b31594e0f54758d0b59ffa5854c6e426e2e8 [file] [log] [blame]
Johannes Berg2a519312009-02-10 21:25:55 +01001/*
2 * cfg80211 scan result handling
3 *
4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
5 */
6#include <linux/kernel.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09007#include <linux/slab.h>
Johannes Berg2a519312009-02-10 21:25:55 +01008#include <linux/module.h>
9#include <linux/netdevice.h>
10#include <linux/wireless.h>
11#include <linux/nl80211.h>
12#include <linux/etherdevice.h>
13#include <net/arp.h>
14#include <net/cfg80211.h>
Johannes Berg262eb9b22011-07-13 10:39:09 +020015#include <net/cfg80211-wext.h>
Johannes Berg2a519312009-02-10 21:25:55 +010016#include <net/iw_handler.h>
17#include "core.h"
18#include "nl80211.h"
Johannes Berga9a11622009-07-27 12:01:53 +020019#include "wext-compat.h"
Johannes Berg2a519312009-02-10 21:25:55 +010020
Helmut Schaa09f97e02009-07-23 12:14:29 +020021#define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ)
Johannes Berg2a519312009-02-10 21:25:55 +010022
Johannes Berg01a0ac42009-08-20 21:36:16 +020023void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
Johannes Berg2a519312009-02-10 21:25:55 +010024{
Johannes Berg667503dd2009-07-07 03:56:11 +020025 struct cfg80211_scan_request *request;
Johannes Berg2a519312009-02-10 21:25:55 +010026 struct net_device *dev;
Johannes Berg3d23e342009-09-29 23:27:28 +020027#ifdef CONFIG_CFG80211_WEXT
Johannes Berg2a519312009-02-10 21:25:55 +010028 union iwreq_data wrqu;
29#endif
30
Johannes Berg01a0ac42009-08-20 21:36:16 +020031 ASSERT_RDEV_LOCK(rdev);
32
Johannes Berg667503dd2009-07-07 03:56:11 +020033 request = rdev->scan_req;
34
Johannes Berg01a0ac42009-08-20 21:36:16 +020035 if (!request)
36 return;
37
Johannes Berg463d0182009-07-14 00:33:35 +020038 dev = request->dev;
Johannes Berg2a519312009-02-10 21:25:55 +010039
Johannes Berg6829c872009-07-02 09:13:27 +020040 /*
41 * This must be before sending the other events!
42 * Otherwise, wpa_supplicant gets completely confused with
43 * wext events.
44 */
45 cfg80211_sme_scan_done(dev);
46
Johannes Berg667503dd2009-07-07 03:56:11 +020047 if (request->aborted)
Johannes Berg36e6fea2009-08-12 22:21:21 +020048 nl80211_send_scan_aborted(rdev, dev);
Johannes Berg2a519312009-02-10 21:25:55 +010049 else
Johannes Berg36e6fea2009-08-12 22:21:21 +020050 nl80211_send_scan_done(rdev, dev);
Johannes Berg2a519312009-02-10 21:25:55 +010051
Johannes Berg3d23e342009-09-29 23:27:28 +020052#ifdef CONFIG_CFG80211_WEXT
Johannes Berg667503dd2009-07-07 03:56:11 +020053 if (!request->aborted) {
Johannes Berg2a519312009-02-10 21:25:55 +010054 memset(&wrqu, 0, sizeof(wrqu));
55
56 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
57 }
58#endif
59
60 dev_put(dev);
61
Johannes Berg36e6fea2009-08-12 22:21:21 +020062 rdev->scan_req = NULL;
Johannes Berg01a0ac42009-08-20 21:36:16 +020063
64 /*
65 * OK. If this is invoked with "leak" then we can't
66 * free this ... but we've cleaned it up anyway. The
67 * driver failed to call the scan_done callback, so
68 * all bets are off, it might still be trying to use
69 * the scan request or not ... if it accesses the dev
70 * in there (it shouldn't anyway) then it may crash.
71 */
72 if (!leak)
73 kfree(request);
Johannes Berg2a519312009-02-10 21:25:55 +010074}
Johannes Berg667503dd2009-07-07 03:56:11 +020075
Johannes Berg36e6fea2009-08-12 22:21:21 +020076void __cfg80211_scan_done(struct work_struct *wk)
77{
78 struct cfg80211_registered_device *rdev;
79
80 rdev = container_of(wk, struct cfg80211_registered_device,
81 scan_done_wk);
82
83 cfg80211_lock_rdev(rdev);
Johannes Berg01a0ac42009-08-20 21:36:16 +020084 ___cfg80211_scan_done(rdev, false);
Johannes Berg36e6fea2009-08-12 22:21:21 +020085 cfg80211_unlock_rdev(rdev);
86}
87
Johannes Berg667503dd2009-07-07 03:56:11 +020088void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
89{
Johannes Berg667503dd2009-07-07 03:56:11 +020090 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
91
92 request->aborted = aborted;
Alban Browaeyse60d7442009-11-25 15:13:00 +010093 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
Johannes Berg667503dd2009-07-07 03:56:11 +020094}
Johannes Berg2a519312009-02-10 21:25:55 +010095EXPORT_SYMBOL(cfg80211_scan_done);
96
Luciano Coelho807f8a82011-05-11 17:09:35 +030097void __cfg80211_sched_scan_results(struct work_struct *wk)
98{
99 struct cfg80211_registered_device *rdev;
100
101 rdev = container_of(wk, struct cfg80211_registered_device,
102 sched_scan_results_wk);
103
Luciano Coelhoc10841c2011-06-30 08:32:41 +0300104 mutex_lock(&rdev->sched_scan_mtx);
Luciano Coelho807f8a82011-05-11 17:09:35 +0300105
106 /* we don't have sched_scan_req anymore if the scan is stopping */
107 if (rdev->sched_scan_req)
108 nl80211_send_sched_scan_results(rdev,
109 rdev->sched_scan_req->dev);
110
Luciano Coelhoc10841c2011-06-30 08:32:41 +0300111 mutex_unlock(&rdev->sched_scan_mtx);
Luciano Coelho807f8a82011-05-11 17:09:35 +0300112}
113
114void cfg80211_sched_scan_results(struct wiphy *wiphy)
115{
116 /* ignore if we're not scanning */
117 if (wiphy_to_dev(wiphy)->sched_scan_req)
118 queue_work(cfg80211_wq,
119 &wiphy_to_dev(wiphy)->sched_scan_results_wk);
120}
121EXPORT_SYMBOL(cfg80211_sched_scan_results);
122
Luciano Coelho85a99942011-05-12 16:28:29 +0300123void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
Luciano Coelho807f8a82011-05-11 17:09:35 +0300124{
Luciano Coelho85a99942011-05-12 16:28:29 +0300125 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
Luciano Coelho807f8a82011-05-11 17:09:35 +0300126
Luciano Coelhoc10841c2011-06-30 08:32:41 +0300127 mutex_lock(&rdev->sched_scan_mtx);
Luciano Coelho807f8a82011-05-11 17:09:35 +0300128 __cfg80211_stop_sched_scan(rdev, true);
Luciano Coelhoc10841c2011-06-30 08:32:41 +0300129 mutex_unlock(&rdev->sched_scan_mtx);
Luciano Coelho807f8a82011-05-11 17:09:35 +0300130}
Luciano Coelho807f8a82011-05-11 17:09:35 +0300131EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
132
133int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
134 bool driver_initiated)
135{
Luciano Coelho807f8a82011-05-11 17:09:35 +0300136 struct net_device *dev;
137
Luciano Coelhoc10841c2011-06-30 08:32:41 +0300138 lockdep_assert_held(&rdev->sched_scan_mtx);
Luciano Coelho807f8a82011-05-11 17:09:35 +0300139
140 if (!rdev->sched_scan_req)
Luciano Coelho1a84ff72011-07-08 11:16:16 +0300141 return -ENOENT;
Luciano Coelho807f8a82011-05-11 17:09:35 +0300142
143 dev = rdev->sched_scan_req->dev;
144
Luciano Coelho85a99942011-05-12 16:28:29 +0300145 if (!driver_initiated) {
Jesper Juhl3b4670f2011-06-29 22:49:33 +0200146 int err = rdev->ops->sched_scan_stop(&rdev->wiphy, dev);
Luciano Coelho85a99942011-05-12 16:28:29 +0300147 if (err)
148 return err;
149 }
Luciano Coelho807f8a82011-05-11 17:09:35 +0300150
151 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
152
153 kfree(rdev->sched_scan_req);
154 rdev->sched_scan_req = NULL;
155
Jesper Juhl3b4670f2011-06-29 22:49:33 +0200156 return 0;
Luciano Coelho807f8a82011-05-11 17:09:35 +0300157}
158
Johannes Berg2a519312009-02-10 21:25:55 +0100159static void bss_release(struct kref *ref)
160{
161 struct cfg80211_internal_bss *bss;
162
163 bss = container_of(ref, struct cfg80211_internal_bss, ref);
Johannes Berg78c1c7e2009-02-10 21:25:57 +0100164 if (bss->pub.free_priv)
165 bss->pub.free_priv(&bss->pub);
Johannes Bergcd1658f2009-04-16 15:00:58 +0200166
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200167 if (bss->beacon_ies_allocated)
168 kfree(bss->pub.beacon_ies);
169 if (bss->proberesp_ies_allocated)
170 kfree(bss->pub.proberesp_ies);
Johannes Bergcd1658f2009-04-16 15:00:58 +0200171
Johannes Berg19957bb2009-07-02 17:20:43 +0200172 BUG_ON(atomic_read(&bss->hold));
173
Johannes Berg2a519312009-02-10 21:25:55 +0100174 kfree(bss);
175}
176
177/* must hold dev->bss_lock! */
Dan Williamscb3a8ee2009-02-11 17:14:43 -0500178void cfg80211_bss_age(struct cfg80211_registered_device *dev,
179 unsigned long age_secs)
180{
181 struct cfg80211_internal_bss *bss;
182 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
183
184 list_for_each_entry(bss, &dev->bss_list, list) {
185 bss->ts -= age_jiffies;
186 }
187}
188
189/* must hold dev->bss_lock! */
Juuso Oikarinen2b78ac92011-03-28 14:32:32 +0300190static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
191 struct cfg80211_internal_bss *bss)
192{
193 list_del_init(&bss->list);
194 rb_erase(&bss->rbn, &dev->bss_tree);
195 kref_put(&bss->ref, bss_release);
196}
197
198/* must hold dev->bss_lock! */
Johannes Berg2a519312009-02-10 21:25:55 +0100199void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
200{
201 struct cfg80211_internal_bss *bss, *tmp;
202 bool expired = false;
203
204 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
Johannes Berg19957bb2009-07-02 17:20:43 +0200205 if (atomic_read(&bss->hold))
206 continue;
207 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
Johannes Berg2a519312009-02-10 21:25:55 +0100208 continue;
Juuso Oikarinen2b78ac92011-03-28 14:32:32 +0300209 __cfg80211_unlink_bss(dev, bss);
Johannes Berg2a519312009-02-10 21:25:55 +0100210 expired = true;
211 }
212
213 if (expired)
214 dev->bss_generation++;
215}
216
Johannes Bergc21dbf92010-01-26 14:15:46 +0100217const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
Johannes Berg2a519312009-02-10 21:25:55 +0100218{
Johannes Bergc21dbf92010-01-26 14:15:46 +0100219 while (len > 2 && ies[0] != eid) {
Johannes Berg2a519312009-02-10 21:25:55 +0100220 len -= ies[1] + 2;
221 ies += ies[1] + 2;
222 }
223 if (len < 2)
224 return NULL;
225 if (len < 2 + ies[1])
226 return NULL;
227 return ies;
228}
Johannes Bergc21dbf92010-01-26 14:15:46 +0100229EXPORT_SYMBOL(cfg80211_find_ie);
Johannes Berg2a519312009-02-10 21:25:55 +0100230
Eliad Peller0c28ec52011-09-15 11:53:01 +0300231const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
232 const u8 *ies, int len)
233{
234 struct ieee80211_vendor_ie *ie;
235 const u8 *pos = ies, *end = ies + len;
236 int ie_oui;
237
238 while (pos < end) {
239 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
240 end - pos);
241 if (!pos)
242 return NULL;
243
244 if (end - pos < sizeof(*ie))
245 return NULL;
246
247 ie = (struct ieee80211_vendor_ie *)pos;
248 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
249 if (ie_oui == oui && ie->oui_type == oui_type)
250 return pos;
251
252 pos += 2 + ie->len;
253 }
254 return NULL;
255}
256EXPORT_SYMBOL(cfg80211_find_vendor_ie);
257
Johannes Berg2a519312009-02-10 21:25:55 +0100258static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
259{
Johannes Bergc21dbf92010-01-26 14:15:46 +0100260 const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
261 const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
Johannes Berg2a519312009-02-10 21:25:55 +0100262
Johannes Berg3b6ef632011-11-04 11:01:46 +0100263 /* equal if both missing */
Johannes Berg2a519312009-02-10 21:25:55 +0100264 if (!ie1 && !ie2)
265 return 0;
Johannes Berg3b6ef632011-11-04 11:01:46 +0100266 /* sort missing IE before (left of) present IE */
267 if (!ie1)
Johannes Berg2a519312009-02-10 21:25:55 +0100268 return -1;
Johannes Berg3b6ef632011-11-04 11:01:46 +0100269 if (!ie2)
270 return 1;
Johannes Berg2a519312009-02-10 21:25:55 +0100271
Johannes Berg3b6ef632011-11-04 11:01:46 +0100272 /* sort by length first, then by contents */
273 if (ie1[1] != ie2[1])
Johannes Berg2a519312009-02-10 21:25:55 +0100274 return ie2[1] - ie1[1];
Johannes Berg3b6ef632011-11-04 11:01:46 +0100275 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
Johannes Berg2a519312009-02-10 21:25:55 +0100276}
277
278static bool is_bss(struct cfg80211_bss *a,
279 const u8 *bssid,
280 const u8 *ssid, size_t ssid_len)
281{
282 const u8 *ssidie;
283
Johannes Berg79420f02009-02-10 21:25:59 +0100284 if (bssid && compare_ether_addr(a->bssid, bssid))
Johannes Berg2a519312009-02-10 21:25:55 +0100285 return false;
286
Johannes Berg79420f02009-02-10 21:25:59 +0100287 if (!ssid)
288 return true;
289
Johannes Bergc21dbf92010-01-26 14:15:46 +0100290 ssidie = cfg80211_find_ie(WLAN_EID_SSID,
291 a->information_elements,
292 a->len_information_elements);
Johannes Berg2a519312009-02-10 21:25:55 +0100293 if (!ssidie)
294 return false;
295 if (ssidie[1] != ssid_len)
296 return false;
297 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
298}
299
Eliad Peller333ba732011-05-29 15:53:20 +0300300static bool is_mesh_bss(struct cfg80211_bss *a)
301{
302 const u8 *ie;
303
304 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
305 return false;
306
307 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
308 a->information_elements,
309 a->len_information_elements);
310 if (!ie)
311 return false;
312
313 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
314 a->information_elements,
315 a->len_information_elements);
316 if (!ie)
317 return false;
318
319 return true;
320}
321
Johannes Berg2a519312009-02-10 21:25:55 +0100322static bool is_mesh(struct cfg80211_bss *a,
323 const u8 *meshid, size_t meshidlen,
324 const u8 *meshcfg)
325{
326 const u8 *ie;
327
Eliad Peller333ba732011-05-29 15:53:20 +0300328 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
Johannes Berg2a519312009-02-10 21:25:55 +0100329 return false;
330
Johannes Bergc21dbf92010-01-26 14:15:46 +0100331 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
332 a->information_elements,
333 a->len_information_elements);
Johannes Berg2a519312009-02-10 21:25:55 +0100334 if (!ie)
335 return false;
336 if (ie[1] != meshidlen)
337 return false;
338 if (memcmp(ie + 2, meshid, meshidlen))
339 return false;
340
Johannes Bergc21dbf92010-01-26 14:15:46 +0100341 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
342 a->information_elements,
343 a->len_information_elements);
Johannes Bergcd3468b2009-07-29 22:07:44 +0200344 if (!ie)
345 return false;
Rui Paulo136cfa22009-11-18 18:40:00 +0000346 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
Johannes Berg2a519312009-02-10 21:25:55 +0100347 return false;
348
349 /*
350 * Ignore mesh capability (last two bytes of the IE) when
351 * comparing since that may differ between stations taking
352 * part in the same mesh.
353 */
Rui Paulo136cfa22009-11-18 18:40:00 +0000354 return memcmp(ie + 2, meshcfg,
355 sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
Johannes Berg2a519312009-02-10 21:25:55 +0100356}
357
358static int cmp_bss(struct cfg80211_bss *a,
359 struct cfg80211_bss *b)
360{
361 int r;
362
363 if (a->channel != b->channel)
364 return b->channel->center_freq - a->channel->center_freq;
365
Eliad Peller333ba732011-05-29 15:53:20 +0300366 if (is_mesh_bss(a) && is_mesh_bss(b)) {
Johannes Berg2a519312009-02-10 21:25:55 +0100367 r = cmp_ies(WLAN_EID_MESH_ID,
368 a->information_elements,
369 a->len_information_elements,
370 b->information_elements,
371 b->len_information_elements);
372 if (r)
373 return r;
374 return cmp_ies(WLAN_EID_MESH_CONFIG,
375 a->information_elements,
376 a->len_information_elements,
377 b->information_elements,
378 b->len_information_elements);
379 }
380
Javier Cardona0a35d362011-05-04 10:24:56 -0700381 r = memcmp(a->bssid, b->bssid, ETH_ALEN);
382 if (r)
383 return r;
384
Johannes Berg2a519312009-02-10 21:25:55 +0100385 return cmp_ies(WLAN_EID_SSID,
386 a->information_elements,
387 a->len_information_elements,
388 b->information_elements,
389 b->len_information_elements);
390}
391
392struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
393 struct ieee80211_channel *channel,
394 const u8 *bssid,
Johannes Berg79420f02009-02-10 21:25:59 +0100395 const u8 *ssid, size_t ssid_len,
396 u16 capa_mask, u16 capa_val)
Johannes Berg2a519312009-02-10 21:25:55 +0100397{
398 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
399 struct cfg80211_internal_bss *bss, *res = NULL;
Johannes Bergccb6c132010-07-13 10:55:38 +0200400 unsigned long now = jiffies;
Johannes Berg2a519312009-02-10 21:25:55 +0100401
402 spin_lock_bh(&dev->bss_lock);
403
404 list_for_each_entry(bss, &dev->bss_list, list) {
Johannes Berg79420f02009-02-10 21:25:59 +0100405 if ((bss->pub.capability & capa_mask) != capa_val)
406 continue;
Johannes Berg2a519312009-02-10 21:25:55 +0100407 if (channel && bss->pub.channel != channel)
408 continue;
Johannes Bergccb6c132010-07-13 10:55:38 +0200409 /* Don't get expired BSS structs */
410 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
411 !atomic_read(&bss->hold))
412 continue;
Johannes Berg2a519312009-02-10 21:25:55 +0100413 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
414 res = bss;
415 kref_get(&res->ref);
416 break;
417 }
418 }
419
420 spin_unlock_bh(&dev->bss_lock);
421 if (!res)
422 return NULL;
423 return &res->pub;
424}
425EXPORT_SYMBOL(cfg80211_get_bss);
426
427struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
428 struct ieee80211_channel *channel,
429 const u8 *meshid, size_t meshidlen,
430 const u8 *meshcfg)
431{
432 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
433 struct cfg80211_internal_bss *bss, *res = NULL;
434
435 spin_lock_bh(&dev->bss_lock);
436
437 list_for_each_entry(bss, &dev->bss_list, list) {
438 if (channel && bss->pub.channel != channel)
439 continue;
440 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
441 res = bss;
442 kref_get(&res->ref);
443 break;
444 }
445 }
446
447 spin_unlock_bh(&dev->bss_lock);
448 if (!res)
449 return NULL;
450 return &res->pub;
451}
452EXPORT_SYMBOL(cfg80211_get_mesh);
453
454
455static void rb_insert_bss(struct cfg80211_registered_device *dev,
456 struct cfg80211_internal_bss *bss)
457{
458 struct rb_node **p = &dev->bss_tree.rb_node;
459 struct rb_node *parent = NULL;
460 struct cfg80211_internal_bss *tbss;
461 int cmp;
462
463 while (*p) {
464 parent = *p;
465 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
466
467 cmp = cmp_bss(&bss->pub, &tbss->pub);
468
469 if (WARN_ON(!cmp)) {
470 /* will sort of leak this BSS */
471 return;
472 }
473
474 if (cmp < 0)
475 p = &(*p)->rb_left;
476 else
477 p = &(*p)->rb_right;
478 }
479
480 rb_link_node(&bss->rbn, parent, p);
481 rb_insert_color(&bss->rbn, &dev->bss_tree);
482}
483
484static struct cfg80211_internal_bss *
485rb_find_bss(struct cfg80211_registered_device *dev,
486 struct cfg80211_internal_bss *res)
487{
488 struct rb_node *n = dev->bss_tree.rb_node;
489 struct cfg80211_internal_bss *bss;
490 int r;
491
492 while (n) {
493 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
494 r = cmp_bss(&res->pub, &bss->pub);
495
496 if (r == 0)
497 return bss;
498 else if (r < 0)
499 n = n->rb_left;
500 else
501 n = n->rb_right;
502 }
503
504 return NULL;
505}
506
507static struct cfg80211_internal_bss *
508cfg80211_bss_update(struct cfg80211_registered_device *dev,
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200509 struct cfg80211_internal_bss *res)
Johannes Berg2a519312009-02-10 21:25:55 +0100510{
511 struct cfg80211_internal_bss *found = NULL;
Johannes Berg2a519312009-02-10 21:25:55 +0100512
513 /*
514 * The reference to "res" is donated to this function.
515 */
516
517 if (WARN_ON(!res->pub.channel)) {
518 kref_put(&res->ref, bss_release);
519 return NULL;
520 }
521
522 res->ts = jiffies;
523
Johannes Berg2a519312009-02-10 21:25:55 +0100524 spin_lock_bh(&dev->bss_lock);
525
526 found = rb_find_bss(dev, res);
527
Johannes Bergcd1658f2009-04-16 15:00:58 +0200528 if (found) {
Johannes Berg2a519312009-02-10 21:25:55 +0100529 found->pub.beacon_interval = res->pub.beacon_interval;
530 found->pub.tsf = res->pub.tsf;
531 found->pub.signal = res->pub.signal;
Johannes Berg2a519312009-02-10 21:25:55 +0100532 found->pub.capability = res->pub.capability;
533 found->ts = res->ts;
Johannes Bergcd1658f2009-04-16 15:00:58 +0200534
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200535 /* Update IEs */
536 if (res->pub.proberesp_ies) {
Johannes Bergcd1658f2009-04-16 15:00:58 +0200537 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200538 size_t ielen = res->pub.len_proberesp_ies;
Johannes Bergcd1658f2009-04-16 15:00:58 +0200539
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200540 if (found->pub.proberesp_ies &&
541 !found->proberesp_ies_allocated &&
542 ksize(found) >= used + ielen) {
543 memcpy(found->pub.proberesp_ies,
544 res->pub.proberesp_ies, ielen);
545 found->pub.len_proberesp_ies = ielen;
Johannes Bergcd1658f2009-04-16 15:00:58 +0200546 } else {
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200547 u8 *ies = found->pub.proberesp_ies;
Johannes Bergcd1658f2009-04-16 15:00:58 +0200548
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200549 if (found->proberesp_ies_allocated)
Michael Buesch273de922009-04-25 22:28:55 +0200550 ies = krealloc(ies, ielen, GFP_ATOMIC);
551 else
Johannes Bergcd1658f2009-04-16 15:00:58 +0200552 ies = kmalloc(ielen, GFP_ATOMIC);
553
554 if (ies) {
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200555 memcpy(ies, res->pub.proberesp_ies,
556 ielen);
557 found->proberesp_ies_allocated = true;
558 found->pub.proberesp_ies = ies;
559 found->pub.len_proberesp_ies = ielen;
560 }
561 }
562
563 /* Override possible earlier Beacon frame IEs */
564 found->pub.information_elements =
565 found->pub.proberesp_ies;
566 found->pub.len_information_elements =
567 found->pub.len_proberesp_ies;
568 }
569 if (res->pub.beacon_ies) {
570 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
571 size_t ielen = res->pub.len_beacon_ies;
Sven Neumann01123e22010-12-09 15:05:24 +0100572 bool information_elements_is_beacon_ies =
573 (found->pub.information_elements ==
574 found->pub.beacon_ies);
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200575
576 if (found->pub.beacon_ies &&
577 !found->beacon_ies_allocated &&
578 ksize(found) >= used + ielen) {
579 memcpy(found->pub.beacon_ies,
580 res->pub.beacon_ies, ielen);
581 found->pub.len_beacon_ies = ielen;
582 } else {
583 u8 *ies = found->pub.beacon_ies;
584
585 if (found->beacon_ies_allocated)
586 ies = krealloc(ies, ielen, GFP_ATOMIC);
587 else
588 ies = kmalloc(ielen, GFP_ATOMIC);
589
590 if (ies) {
591 memcpy(ies, res->pub.beacon_ies,
592 ielen);
593 found->beacon_ies_allocated = true;
594 found->pub.beacon_ies = ies;
595 found->pub.len_beacon_ies = ielen;
Johannes Bergcd1658f2009-04-16 15:00:58 +0200596 }
597 }
Sven Neumann01123e22010-12-09 15:05:24 +0100598
599 /* Override IEs if they were from a beacon before */
600 if (information_elements_is_beacon_ies) {
601 found->pub.information_elements =
602 found->pub.beacon_ies;
603 found->pub.len_information_elements =
604 found->pub.len_beacon_ies;
605 }
Johannes Bergcd1658f2009-04-16 15:00:58 +0200606 }
607
Johannes Berg2a519312009-02-10 21:25:55 +0100608 kref_put(&res->ref, bss_release);
609 } else {
610 /* this "consumes" the reference */
611 list_add_tail(&res->list, &dev->bss_list);
612 rb_insert_bss(dev, res);
613 found = res;
614 }
615
616 dev->bss_generation++;
617 spin_unlock_bh(&dev->bss_lock);
618
619 kref_get(&found->ref);
620 return found;
621}
622
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +0200623struct cfg80211_bss*
624cfg80211_inform_bss(struct wiphy *wiphy,
625 struct ieee80211_channel *channel,
626 const u8 *bssid,
627 u64 timestamp, u16 capability, u16 beacon_interval,
628 const u8 *ie, size_t ielen,
629 s32 signal, gfp_t gfp)
630{
631 struct cfg80211_internal_bss *res;
632 size_t privsz;
633
634 if (WARN_ON(!wiphy))
635 return NULL;
636
637 privsz = wiphy->bss_priv_size;
638
Sujith22fe88d2010-05-13 10:34:08 +0530639 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +0200640 (signal < 0 || signal > 100)))
641 return NULL;
642
643 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
644 if (!res)
645 return NULL;
646
647 memcpy(res->pub.bssid, bssid, ETH_ALEN);
648 res->pub.channel = channel;
649 res->pub.signal = signal;
650 res->pub.tsf = timestamp;
651 res->pub.beacon_interval = beacon_interval;
652 res->pub.capability = capability;
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200653 /*
654 * Since we do not know here whether the IEs are from a Beacon or Probe
655 * Response frame, we need to pick one of the options and only use it
656 * with the driver that does not provide the full Beacon/Probe Response
657 * frame. Use Beacon frame pointer to avoid indicating that this should
658 * override the information_elements pointer should we have received an
659 * earlier indication of Probe Response data.
660 *
661 * The initial buffer for the IEs is allocated with the BSS entry and
662 * is located after the private area.
663 */
664 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
665 memcpy(res->pub.beacon_ies, ie, ielen);
666 res->pub.len_beacon_ies = ielen;
667 res->pub.information_elements = res->pub.beacon_ies;
668 res->pub.len_information_elements = res->pub.len_beacon_ies;
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +0200669
670 kref_init(&res->ref);
671
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200672 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +0200673 if (!res)
674 return NULL;
675
676 if (res->pub.capability & WLAN_CAPABILITY_ESS)
677 regulatory_hint_found_beacon(wiphy, channel, gfp);
678
679 /* cfg80211_bss_update gives us a referenced result */
680 return &res->pub;
681}
682EXPORT_SYMBOL(cfg80211_inform_bss);
683
Johannes Berg2a519312009-02-10 21:25:55 +0100684struct cfg80211_bss *
685cfg80211_inform_bss_frame(struct wiphy *wiphy,
686 struct ieee80211_channel *channel,
687 struct ieee80211_mgmt *mgmt, size_t len,
Johannes Berg77965c92009-02-18 18:45:06 +0100688 s32 signal, gfp_t gfp)
Johannes Berg2a519312009-02-10 21:25:55 +0100689{
690 struct cfg80211_internal_bss *res;
691 size_t ielen = len - offsetof(struct ieee80211_mgmt,
692 u.probe_resp.variable);
Mariusz Kozlowskibef9bac2011-03-26 19:26:55 +0100693 size_t privsz;
694
695 if (WARN_ON(!mgmt))
696 return NULL;
697
698 if (WARN_ON(!wiphy))
699 return NULL;
Johannes Berg2a519312009-02-10 21:25:55 +0100700
Sujith22fe88d2010-05-13 10:34:08 +0530701 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
Johannes Berg2a519312009-02-10 21:25:55 +0100702 (signal < 0 || signal > 100)))
703 return NULL;
704
Mariusz Kozlowskibef9bac2011-03-26 19:26:55 +0100705 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
Johannes Berg2a519312009-02-10 21:25:55 +0100706 return NULL;
707
Mariusz Kozlowskibef9bac2011-03-26 19:26:55 +0100708 privsz = wiphy->bss_priv_size;
709
Johannes Berg2a519312009-02-10 21:25:55 +0100710 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
711 if (!res)
712 return NULL;
713
714 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
715 res->pub.channel = channel;
Johannes Berg2a519312009-02-10 21:25:55 +0100716 res->pub.signal = signal;
717 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
718 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
719 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200720 /*
721 * The initial buffer for the IEs is allocated with the BSS entry and
722 * is located after the private area.
723 */
724 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
725 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
726 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
727 ielen);
728 res->pub.len_proberesp_ies = ielen;
729 res->pub.information_elements = res->pub.proberesp_ies;
730 res->pub.len_information_elements = res->pub.len_proberesp_ies;
731 } else {
732 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
733 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
734 res->pub.len_beacon_ies = ielen;
735 res->pub.information_elements = res->pub.beacon_ies;
736 res->pub.len_information_elements = res->pub.len_beacon_ies;
737 }
Johannes Berg2a519312009-02-10 21:25:55 +0100738
739 kref_init(&res->ref);
740
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200741 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
Johannes Berg2a519312009-02-10 21:25:55 +0100742 if (!res)
743 return NULL;
744
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500745 if (res->pub.capability & WLAN_CAPABILITY_ESS)
746 regulatory_hint_found_beacon(wiphy, channel, gfp);
747
Johannes Berg2a519312009-02-10 21:25:55 +0100748 /* cfg80211_bss_update gives us a referenced result */
749 return &res->pub;
750}
751EXPORT_SYMBOL(cfg80211_inform_bss_frame);
752
753void cfg80211_put_bss(struct cfg80211_bss *pub)
754{
755 struct cfg80211_internal_bss *bss;
756
757 if (!pub)
758 return;
759
760 bss = container_of(pub, struct cfg80211_internal_bss, pub);
761 kref_put(&bss->ref, bss_release);
762}
763EXPORT_SYMBOL(cfg80211_put_bss);
764
Johannes Bergd491af12009-02-10 21:25:58 +0100765void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
766{
767 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
768 struct cfg80211_internal_bss *bss;
769
770 if (WARN_ON(!pub))
771 return;
772
773 bss = container_of(pub, struct cfg80211_internal_bss, pub);
774
775 spin_lock_bh(&dev->bss_lock);
Johannes Berg32073902010-10-06 21:18:04 +0200776 if (!list_empty(&bss->list)) {
Juuso Oikarinen2b78ac92011-03-28 14:32:32 +0300777 __cfg80211_unlink_bss(dev, bss);
Johannes Berg32073902010-10-06 21:18:04 +0200778 dev->bss_generation++;
Johannes Berg32073902010-10-06 21:18:04 +0200779 }
Johannes Bergd491af12009-02-10 21:25:58 +0100780 spin_unlock_bh(&dev->bss_lock);
Johannes Bergd491af12009-02-10 21:25:58 +0100781}
782EXPORT_SYMBOL(cfg80211_unlink_bss);
783
Johannes Berg3d23e342009-09-29 23:27:28 +0200784#ifdef CONFIG_CFG80211_WEXT
Johannes Berg2a519312009-02-10 21:25:55 +0100785int cfg80211_wext_siwscan(struct net_device *dev,
786 struct iw_request_info *info,
787 union iwreq_data *wrqu, char *extra)
788{
789 struct cfg80211_registered_device *rdev;
790 struct wiphy *wiphy;
791 struct iw_scan_req *wreq = NULL;
Johannes Berg65486c82009-12-23 15:33:35 +0100792 struct cfg80211_scan_request *creq = NULL;
Johannes Berg2a519312009-02-10 21:25:55 +0100793 int i, err, n_channels = 0;
794 enum ieee80211_band band;
795
796 if (!netif_running(dev))
797 return -ENETDOWN;
798
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200799 if (wrqu->data.length == sizeof(struct iw_scan_req))
800 wreq = (struct iw_scan_req *)extra;
801
Johannes Berg463d0182009-07-14 00:33:35 +0200802 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
Johannes Berg2a519312009-02-10 21:25:55 +0100803
804 if (IS_ERR(rdev))
805 return PTR_ERR(rdev);
806
807 if (rdev->scan_req) {
808 err = -EBUSY;
809 goto out;
810 }
811
812 wiphy = &rdev->wiphy;
813
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200814 /* Determine number of channels, needed to allocate creq */
815 if (wreq && wreq->num_channels)
816 n_channels = wreq->num_channels;
817 else {
818 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
819 if (wiphy->bands[band])
820 n_channels += wiphy->bands[band]->n_channels;
821 }
Johannes Berg2a519312009-02-10 21:25:55 +0100822
823 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
824 n_channels * sizeof(void *),
825 GFP_ATOMIC);
826 if (!creq) {
827 err = -ENOMEM;
828 goto out;
829 }
830
831 creq->wiphy = wiphy;
Johannes Berg463d0182009-07-14 00:33:35 +0200832 creq->dev = dev;
Johannes Berg5ba63532009-08-07 17:54:07 +0200833 /* SSIDs come after channels */
834 creq->ssids = (void *)&creq->channels[n_channels];
Johannes Berg2a519312009-02-10 21:25:55 +0100835 creq->n_channels = n_channels;
836 creq->n_ssids = 1;
837
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200838 /* translate "Scan on frequencies" request */
Johannes Berg2a519312009-02-10 21:25:55 +0100839 i = 0;
840 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
841 int j;
Johannes Berg584991d2009-11-02 13:32:03 +0100842
Johannes Berg2a519312009-02-10 21:25:55 +0100843 if (!wiphy->bands[band])
844 continue;
Johannes Berg584991d2009-11-02 13:32:03 +0100845
Johannes Berg2a519312009-02-10 21:25:55 +0100846 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
Johannes Berg584991d2009-11-02 13:32:03 +0100847 /* ignore disabled channels */
848 if (wiphy->bands[band]->channels[j].flags &
849 IEEE80211_CHAN_DISABLED)
850 continue;
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200851
852 /* If we have a wireless request structure and the
853 * wireless request specifies frequencies, then search
854 * for the matching hardware channel.
855 */
856 if (wreq && wreq->num_channels) {
857 int k;
858 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
859 for (k = 0; k < wreq->num_channels; k++) {
Holger Schuriga4e7b732009-09-11 10:13:53 +0200860 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200861 if (wext_freq == wiphy_freq)
862 goto wext_freq_found;
863 }
864 goto wext_freq_not_found;
865 }
866
867 wext_freq_found:
Johannes Berg2a519312009-02-10 21:25:55 +0100868 creq->channels[i] = &wiphy->bands[band]->channels[j];
869 i++;
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200870 wext_freq_not_found: ;
Johannes Berg2a519312009-02-10 21:25:55 +0100871 }
872 }
Holger Schurig8862dc52009-09-11 10:13:55 +0200873 /* No channels found? */
874 if (!i) {
875 err = -EINVAL;
876 goto out;
877 }
Johannes Berg2a519312009-02-10 21:25:55 +0100878
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200879 /* Set real number of channels specified in creq->channels[] */
880 creq->n_channels = i;
Johannes Berg2a519312009-02-10 21:25:55 +0100881
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200882 /* translate "Scan for SSID" request */
883 if (wreq) {
Johannes Berg2a519312009-02-10 21:25:55 +0100884 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
Johannes Berg65486c82009-12-23 15:33:35 +0100885 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
886 err = -EINVAL;
887 goto out;
888 }
Johannes Berg2a519312009-02-10 21:25:55 +0100889 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
890 creq->ssids[0].ssid_len = wreq->essid_len;
891 }
892 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
893 creq->n_ssids = 0;
894 }
895
Johannes Berg34850ab2011-07-18 18:08:35 +0200896 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
Johannes Berga401d2b2011-07-20 00:52:16 +0200897 if (wiphy->bands[i])
898 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
Johannes Berg34850ab2011-07-18 18:08:35 +0200899
Johannes Berg2a519312009-02-10 21:25:55 +0100900 rdev->scan_req = creq;
901 err = rdev->ops->scan(wiphy, dev, creq);
902 if (err) {
903 rdev->scan_req = NULL;
Johannes Berg65486c82009-12-23 15:33:35 +0100904 /* creq will be freed below */
Johannes Berg463d0182009-07-14 00:33:35 +0200905 } else {
Johannes Berga538e2d2009-06-16 19:56:42 +0200906 nl80211_send_scan_start(rdev, dev);
Johannes Berg65486c82009-12-23 15:33:35 +0100907 /* creq now owned by driver */
908 creq = NULL;
Johannes Berg463d0182009-07-14 00:33:35 +0200909 dev_hold(dev);
910 }
Johannes Berg2a519312009-02-10 21:25:55 +0100911 out:
Johannes Berg65486c82009-12-23 15:33:35 +0100912 kfree(creq);
Johannes Berg4d0c8ae2009-07-07 03:56:09 +0200913 cfg80211_unlock_rdev(rdev);
Johannes Berg2a519312009-02-10 21:25:55 +0100914 return err;
915}
Johannes Bergba44cb72009-04-20 18:49:39 +0200916EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
Johannes Berg2a519312009-02-10 21:25:55 +0100917
918static void ieee80211_scan_add_ies(struct iw_request_info *info,
919 struct cfg80211_bss *bss,
920 char **current_ev, char *end_buf)
921{
922 u8 *pos, *end, *next;
923 struct iw_event iwe;
924
925 if (!bss->information_elements ||
926 !bss->len_information_elements)
927 return;
928
929 /*
930 * If needed, fragment the IEs buffer (at IE boundaries) into short
931 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
932 */
933 pos = bss->information_elements;
934 end = pos + bss->len_information_elements;
935
936 while (end - pos > IW_GENERIC_IE_MAX) {
937 next = pos + 2 + pos[1];
938 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
939 next = next + 2 + next[1];
940
941 memset(&iwe, 0, sizeof(iwe));
942 iwe.cmd = IWEVGENIE;
943 iwe.u.data.length = next - pos;
944 *current_ev = iwe_stream_add_point(info, *current_ev,
945 end_buf, &iwe, pos);
946
947 pos = next;
948 }
949
950 if (end > pos) {
951 memset(&iwe, 0, sizeof(iwe));
952 iwe.cmd = IWEVGENIE;
953 iwe.u.data.length = end - pos;
954 *current_ev = iwe_stream_add_point(info, *current_ev,
955 end_buf, &iwe, pos);
956 }
957}
958
Dan Williamscb3a8ee2009-02-11 17:14:43 -0500959static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
960{
961 unsigned long end = jiffies;
962
963 if (end >= start)
964 return jiffies_to_msecs(end - start);
965
966 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
967}
Johannes Berg2a519312009-02-10 21:25:55 +0100968
969static char *
Johannes Berg77965c92009-02-18 18:45:06 +0100970ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
971 struct cfg80211_internal_bss *bss, char *current_ev,
972 char *end_buf)
Johannes Berg2a519312009-02-10 21:25:55 +0100973{
974 struct iw_event iwe;
975 u8 *buf, *cfg, *p;
976 u8 *ie = bss->pub.information_elements;
Johannes Berga77b8552009-02-18 18:27:22 +0100977 int rem = bss->pub.len_information_elements, i, sig;
Johannes Berg2a519312009-02-10 21:25:55 +0100978 bool ismesh = false;
979
980 memset(&iwe, 0, sizeof(iwe));
981 iwe.cmd = SIOCGIWAP;
982 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
983 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
984 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
985 IW_EV_ADDR_LEN);
986
987 memset(&iwe, 0, sizeof(iwe));
988 iwe.cmd = SIOCGIWFREQ;
989 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
990 iwe.u.freq.e = 0;
991 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
992 IW_EV_FREQ_LEN);
993
994 memset(&iwe, 0, sizeof(iwe));
995 iwe.cmd = SIOCGIWFREQ;
996 iwe.u.freq.m = bss->pub.channel->center_freq;
997 iwe.u.freq.e = 6;
998 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
999 IW_EV_FREQ_LEN);
1000
Johannes Berg77965c92009-02-18 18:45:06 +01001001 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
Johannes Berg2a519312009-02-10 21:25:55 +01001002 memset(&iwe, 0, sizeof(iwe));
1003 iwe.cmd = IWEVQUAL;
1004 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1005 IW_QUAL_NOISE_INVALID |
Johannes Berga77b8552009-02-18 18:27:22 +01001006 IW_QUAL_QUAL_UPDATED;
Johannes Berg77965c92009-02-18 18:45:06 +01001007 switch (wiphy->signal_type) {
Johannes Berg2a519312009-02-10 21:25:55 +01001008 case CFG80211_SIGNAL_TYPE_MBM:
Johannes Berga77b8552009-02-18 18:27:22 +01001009 sig = bss->pub.signal / 100;
1010 iwe.u.qual.level = sig;
Johannes Berg2a519312009-02-10 21:25:55 +01001011 iwe.u.qual.updated |= IW_QUAL_DBM;
Johannes Berga77b8552009-02-18 18:27:22 +01001012 if (sig < -110) /* rather bad */
1013 sig = -110;
1014 else if (sig > -40) /* perfect */
1015 sig = -40;
1016 /* will give a range of 0 .. 70 */
1017 iwe.u.qual.qual = sig + 110;
Johannes Berg2a519312009-02-10 21:25:55 +01001018 break;
1019 case CFG80211_SIGNAL_TYPE_UNSPEC:
1020 iwe.u.qual.level = bss->pub.signal;
Johannes Berga77b8552009-02-18 18:27:22 +01001021 /* will give range 0 .. 100 */
1022 iwe.u.qual.qual = bss->pub.signal;
Johannes Berg2a519312009-02-10 21:25:55 +01001023 break;
1024 default:
1025 /* not reached */
1026 break;
1027 }
1028 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1029 &iwe, IW_EV_QUAL_LEN);
1030 }
1031
1032 memset(&iwe, 0, sizeof(iwe));
1033 iwe.cmd = SIOCGIWENCODE;
1034 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1035 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1036 else
1037 iwe.u.data.flags = IW_ENCODE_DISABLED;
1038 iwe.u.data.length = 0;
1039 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1040 &iwe, "");
1041
1042 while (rem >= 2) {
1043 /* invalid data */
1044 if (ie[1] > rem - 2)
1045 break;
1046
1047 switch (ie[0]) {
1048 case WLAN_EID_SSID:
1049 memset(&iwe, 0, sizeof(iwe));
1050 iwe.cmd = SIOCGIWESSID;
1051 iwe.u.data.length = ie[1];
1052 iwe.u.data.flags = 1;
1053 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1054 &iwe, ie + 2);
1055 break;
1056 case WLAN_EID_MESH_ID:
1057 memset(&iwe, 0, sizeof(iwe));
1058 iwe.cmd = SIOCGIWESSID;
1059 iwe.u.data.length = ie[1];
1060 iwe.u.data.flags = 1;
1061 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1062 &iwe, ie + 2);
1063 break;
1064 case WLAN_EID_MESH_CONFIG:
1065 ismesh = true;
Rui Paulo136cfa22009-11-18 18:40:00 +00001066 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
Johannes Berg2a519312009-02-10 21:25:55 +01001067 break;
1068 buf = kmalloc(50, GFP_ATOMIC);
1069 if (!buf)
1070 break;
1071 cfg = ie + 2;
1072 memset(&iwe, 0, sizeof(iwe));
1073 iwe.cmd = IWEVCUSTOM;
Rui Paulo76aa5e72009-11-18 18:22:59 +00001074 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1075 "0x%02X", cfg[0]);
Johannes Berg2a519312009-02-10 21:25:55 +01001076 iwe.u.data.length = strlen(buf);
1077 current_ev = iwe_stream_add_point(info, current_ev,
1078 end_buf,
1079 &iwe, buf);
Rui Paulo76aa5e72009-11-18 18:22:59 +00001080 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1081 cfg[1]);
Johannes Berg2a519312009-02-10 21:25:55 +01001082 iwe.u.data.length = strlen(buf);
1083 current_ev = iwe_stream_add_point(info, current_ev,
1084 end_buf,
1085 &iwe, buf);
Rui Paulo76aa5e72009-11-18 18:22:59 +00001086 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1087 cfg[2]);
Johannes Berg2a519312009-02-10 21:25:55 +01001088 iwe.u.data.length = strlen(buf);
1089 current_ev = iwe_stream_add_point(info, current_ev,
1090 end_buf,
1091 &iwe, buf);
Rui Paulo76aa5e72009-11-18 18:22:59 +00001092 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
Johannes Berg2a519312009-02-10 21:25:55 +01001093 iwe.u.data.length = strlen(buf);
1094 current_ev = iwe_stream_add_point(info, current_ev,
1095 end_buf,
1096 &iwe, buf);
Rui Paulo76aa5e72009-11-18 18:22:59 +00001097 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1098 iwe.u.data.length = strlen(buf);
1099 current_ev = iwe_stream_add_point(info, current_ev,
1100 end_buf,
1101 &iwe, buf);
1102 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1103 iwe.u.data.length = strlen(buf);
1104 current_ev = iwe_stream_add_point(info, current_ev,
1105 end_buf,
1106 &iwe, buf);
1107 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
Johannes Berg2a519312009-02-10 21:25:55 +01001108 iwe.u.data.length = strlen(buf);
1109 current_ev = iwe_stream_add_point(info, current_ev,
1110 end_buf,
1111 &iwe, buf);
1112 kfree(buf);
1113 break;
1114 case WLAN_EID_SUPP_RATES:
1115 case WLAN_EID_EXT_SUPP_RATES:
1116 /* display all supported rates in readable format */
1117 p = current_ev + iwe_stream_lcp_len(info);
1118
1119 memset(&iwe, 0, sizeof(iwe));
1120 iwe.cmd = SIOCGIWRATE;
1121 /* Those two flags are ignored... */
1122 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1123
1124 for (i = 0; i < ie[1]; i++) {
1125 iwe.u.bitrate.value =
1126 ((ie[i + 2] & 0x7f) * 500000);
1127 p = iwe_stream_add_value(info, current_ev, p,
1128 end_buf, &iwe, IW_EV_PARAM_LEN);
1129 }
1130 current_ev = p;
1131 break;
1132 }
1133 rem -= ie[1] + 2;
1134 ie += ie[1] + 2;
1135 }
1136
Joe Perchesf64f9e72009-11-29 16:55:45 -08001137 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1138 ismesh) {
Johannes Berg2a519312009-02-10 21:25:55 +01001139 memset(&iwe, 0, sizeof(iwe));
1140 iwe.cmd = SIOCGIWMODE;
1141 if (ismesh)
1142 iwe.u.mode = IW_MODE_MESH;
1143 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1144 iwe.u.mode = IW_MODE_MASTER;
1145 else
1146 iwe.u.mode = IW_MODE_ADHOC;
1147 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1148 &iwe, IW_EV_UINT_LEN);
1149 }
1150
1151 buf = kmalloc(30, GFP_ATOMIC);
1152 if (buf) {
1153 memset(&iwe, 0, sizeof(iwe));
1154 iwe.cmd = IWEVCUSTOM;
1155 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1156 iwe.u.data.length = strlen(buf);
1157 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1158 &iwe, buf);
1159 memset(&iwe, 0, sizeof(iwe));
1160 iwe.cmd = IWEVCUSTOM;
Dan Williamscb3a8ee2009-02-11 17:14:43 -05001161 sprintf(buf, " Last beacon: %ums ago",
1162 elapsed_jiffies_msecs(bss->ts));
Johannes Berg2a519312009-02-10 21:25:55 +01001163 iwe.u.data.length = strlen(buf);
1164 current_ev = iwe_stream_add_point(info, current_ev,
1165 end_buf, &iwe, buf);
1166 kfree(buf);
1167 }
1168
1169 ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
1170
1171 return current_ev;
1172}
1173
1174
1175static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1176 struct iw_request_info *info,
1177 char *buf, size_t len)
1178{
1179 char *current_ev = buf;
1180 char *end_buf = buf + len;
1181 struct cfg80211_internal_bss *bss;
1182
1183 spin_lock_bh(&dev->bss_lock);
1184 cfg80211_bss_expire(dev);
1185
1186 list_for_each_entry(bss, &dev->bss_list, list) {
1187 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1188 spin_unlock_bh(&dev->bss_lock);
1189 return -E2BIG;
1190 }
Johannes Berg77965c92009-02-18 18:45:06 +01001191 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1192 current_ev, end_buf);
Johannes Berg2a519312009-02-10 21:25:55 +01001193 }
1194 spin_unlock_bh(&dev->bss_lock);
1195 return current_ev - buf;
1196}
1197
1198
1199int cfg80211_wext_giwscan(struct net_device *dev,
1200 struct iw_request_info *info,
1201 struct iw_point *data, char *extra)
1202{
1203 struct cfg80211_registered_device *rdev;
1204 int res;
1205
1206 if (!netif_running(dev))
1207 return -ENETDOWN;
1208
Johannes Berg463d0182009-07-14 00:33:35 +02001209 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
Johannes Berg2a519312009-02-10 21:25:55 +01001210
1211 if (IS_ERR(rdev))
1212 return PTR_ERR(rdev);
1213
1214 if (rdev->scan_req) {
1215 res = -EAGAIN;
1216 goto out;
1217 }
1218
1219 res = ieee80211_scan_results(rdev, info, extra, data->length);
1220 data->length = 0;
1221 if (res >= 0) {
1222 data->length = res;
1223 res = 0;
1224 }
1225
1226 out:
Johannes Berg4d0c8ae2009-07-07 03:56:09 +02001227 cfg80211_unlock_rdev(rdev);
Johannes Berg2a519312009-02-10 21:25:55 +01001228 return res;
1229}
Johannes Bergba44cb72009-04-20 18:49:39 +02001230EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
Johannes Berg2a519312009-02-10 21:25:55 +01001231#endif