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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>
15#include <net/iw_handler.h>
16#include "core.h"
17#include "nl80211.h"
Johannes Berga9a11622009-07-27 12:01:53 +020018#include "wext-compat.h"
Johannes Berg2a519312009-02-10 21:25:55 +010019
Helmut Schaa09f97e02009-07-23 12:14:29 +020020#define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ)
Johannes Berg2a519312009-02-10 21:25:55 +010021
Johannes Berg01a0ac42009-08-20 21:36:16 +020022void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
Johannes Berg2a519312009-02-10 21:25:55 +010023{
Johannes Berg667503dd2009-07-07 03:56:11 +020024 struct cfg80211_scan_request *request;
Johannes Berg2a519312009-02-10 21:25:55 +010025 struct net_device *dev;
Johannes Berg3d23e342009-09-29 23:27:28 +020026#ifdef CONFIG_CFG80211_WEXT
Johannes Berg2a519312009-02-10 21:25:55 +010027 union iwreq_data wrqu;
28#endif
29
Johannes Berg01a0ac42009-08-20 21:36:16 +020030 ASSERT_RDEV_LOCK(rdev);
31
Johannes Berg667503dd2009-07-07 03:56:11 +020032 request = rdev->scan_req;
33
Johannes Berg01a0ac42009-08-20 21:36:16 +020034 if (!request)
35 return;
36
Johannes Berg463d0182009-07-14 00:33:35 +020037 dev = request->dev;
Johannes Berg2a519312009-02-10 21:25:55 +010038
Johannes Berg6829c872009-07-02 09:13:27 +020039 /*
40 * This must be before sending the other events!
41 * Otherwise, wpa_supplicant gets completely confused with
42 * wext events.
43 */
44 cfg80211_sme_scan_done(dev);
45
Johannes Berg667503dd2009-07-07 03:56:11 +020046 if (request->aborted)
Johannes Berg36e6fea2009-08-12 22:21:21 +020047 nl80211_send_scan_aborted(rdev, dev);
Johannes Berg2a519312009-02-10 21:25:55 +010048 else
Johannes Berg36e6fea2009-08-12 22:21:21 +020049 nl80211_send_scan_done(rdev, dev);
Johannes Berg2a519312009-02-10 21:25:55 +010050
Johannes Berg3d23e342009-09-29 23:27:28 +020051#ifdef CONFIG_CFG80211_WEXT
Johannes Berg667503dd2009-07-07 03:56:11 +020052 if (!request->aborted) {
Johannes Berg2a519312009-02-10 21:25:55 +010053 memset(&wrqu, 0, sizeof(wrqu));
54
55 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
56 }
57#endif
58
59 dev_put(dev);
60
Johannes Berg36e6fea2009-08-12 22:21:21 +020061 rdev->scan_req = NULL;
Johannes Berg01a0ac42009-08-20 21:36:16 +020062
63 /*
64 * OK. If this is invoked with "leak" then we can't
65 * free this ... but we've cleaned it up anyway. The
66 * driver failed to call the scan_done callback, so
67 * all bets are off, it might still be trying to use
68 * the scan request or not ... if it accesses the dev
69 * in there (it shouldn't anyway) then it may crash.
70 */
71 if (!leak)
72 kfree(request);
Johannes Berg2a519312009-02-10 21:25:55 +010073}
Johannes Berg667503dd2009-07-07 03:56:11 +020074
Johannes Berg36e6fea2009-08-12 22:21:21 +020075void __cfg80211_scan_done(struct work_struct *wk)
76{
77 struct cfg80211_registered_device *rdev;
78
79 rdev = container_of(wk, struct cfg80211_registered_device,
80 scan_done_wk);
81
82 cfg80211_lock_rdev(rdev);
Johannes Berg01a0ac42009-08-20 21:36:16 +020083 ___cfg80211_scan_done(rdev, false);
Johannes Berg36e6fea2009-08-12 22:21:21 +020084 cfg80211_unlock_rdev(rdev);
85}
86
Johannes Berg667503dd2009-07-07 03:56:11 +020087void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
88{
Johannes Berg667503dd2009-07-07 03:56:11 +020089 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
90
91 request->aborted = aborted;
Alban Browaeyse60d7442009-11-25 15:13:00 +010092 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
Johannes Berg667503dd2009-07-07 03:56:11 +020093}
Johannes Berg2a519312009-02-10 21:25:55 +010094EXPORT_SYMBOL(cfg80211_scan_done);
95
96static void bss_release(struct kref *ref)
97{
98 struct cfg80211_internal_bss *bss;
99
100 bss = container_of(ref, struct cfg80211_internal_bss, ref);
Johannes Berg78c1c7e2009-02-10 21:25:57 +0100101 if (bss->pub.free_priv)
102 bss->pub.free_priv(&bss->pub);
Johannes Bergcd1658f2009-04-16 15:00:58 +0200103
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200104 if (bss->beacon_ies_allocated)
105 kfree(bss->pub.beacon_ies);
106 if (bss->proberesp_ies_allocated)
107 kfree(bss->pub.proberesp_ies);
Johannes Bergcd1658f2009-04-16 15:00:58 +0200108
Johannes Berg19957bb2009-07-02 17:20:43 +0200109 BUG_ON(atomic_read(&bss->hold));
110
Johannes Berg2a519312009-02-10 21:25:55 +0100111 kfree(bss);
112}
113
114/* must hold dev->bss_lock! */
Dan Williamscb3a8ee2009-02-11 17:14:43 -0500115void cfg80211_bss_age(struct cfg80211_registered_device *dev,
116 unsigned long age_secs)
117{
118 struct cfg80211_internal_bss *bss;
119 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
120
121 list_for_each_entry(bss, &dev->bss_list, list) {
122 bss->ts -= age_jiffies;
123 }
124}
125
126/* must hold dev->bss_lock! */
Johannes Berg2a519312009-02-10 21:25:55 +0100127void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
128{
129 struct cfg80211_internal_bss *bss, *tmp;
130 bool expired = false;
131
132 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
Johannes Berg19957bb2009-07-02 17:20:43 +0200133 if (atomic_read(&bss->hold))
134 continue;
135 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
Johannes Berg2a519312009-02-10 21:25:55 +0100136 continue;
137 list_del(&bss->list);
138 rb_erase(&bss->rbn, &dev->bss_tree);
139 kref_put(&bss->ref, bss_release);
140 expired = true;
141 }
142
143 if (expired)
144 dev->bss_generation++;
145}
146
Johannes Bergc21dbf92010-01-26 14:15:46 +0100147const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
Johannes Berg2a519312009-02-10 21:25:55 +0100148{
Johannes Bergc21dbf92010-01-26 14:15:46 +0100149 while (len > 2 && ies[0] != eid) {
Johannes Berg2a519312009-02-10 21:25:55 +0100150 len -= ies[1] + 2;
151 ies += ies[1] + 2;
152 }
153 if (len < 2)
154 return NULL;
155 if (len < 2 + ies[1])
156 return NULL;
157 return ies;
158}
Johannes Bergc21dbf92010-01-26 14:15:46 +0100159EXPORT_SYMBOL(cfg80211_find_ie);
Johannes Berg2a519312009-02-10 21:25:55 +0100160
161static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
162{
Johannes Bergc21dbf92010-01-26 14:15:46 +0100163 const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
164 const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
Johannes Berg2a519312009-02-10 21:25:55 +0100165 int r;
166
167 if (!ie1 && !ie2)
168 return 0;
Johannes Bergcd3468b2009-07-29 22:07:44 +0200169 if (!ie1 || !ie2)
Johannes Berg2a519312009-02-10 21:25:55 +0100170 return -1;
171
172 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
173 if (r == 0 && ie1[1] != ie2[1])
174 return ie2[1] - ie1[1];
175 return r;
176}
177
178static bool is_bss(struct cfg80211_bss *a,
179 const u8 *bssid,
180 const u8 *ssid, size_t ssid_len)
181{
182 const u8 *ssidie;
183
Johannes Berg79420f02009-02-10 21:25:59 +0100184 if (bssid && compare_ether_addr(a->bssid, bssid))
Johannes Berg2a519312009-02-10 21:25:55 +0100185 return false;
186
Johannes Berg79420f02009-02-10 21:25:59 +0100187 if (!ssid)
188 return true;
189
Johannes Bergc21dbf92010-01-26 14:15:46 +0100190 ssidie = cfg80211_find_ie(WLAN_EID_SSID,
191 a->information_elements,
192 a->len_information_elements);
Johannes Berg2a519312009-02-10 21:25:55 +0100193 if (!ssidie)
194 return false;
195 if (ssidie[1] != ssid_len)
196 return false;
197 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
198}
199
200static bool is_mesh(struct cfg80211_bss *a,
201 const u8 *meshid, size_t meshidlen,
202 const u8 *meshcfg)
203{
204 const u8 *ie;
205
206 if (!is_zero_ether_addr(a->bssid))
207 return false;
208
Johannes Bergc21dbf92010-01-26 14:15:46 +0100209 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
210 a->information_elements,
211 a->len_information_elements);
Johannes Berg2a519312009-02-10 21:25:55 +0100212 if (!ie)
213 return false;
214 if (ie[1] != meshidlen)
215 return false;
216 if (memcmp(ie + 2, meshid, meshidlen))
217 return false;
218
Johannes Bergc21dbf92010-01-26 14:15:46 +0100219 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
220 a->information_elements,
221 a->len_information_elements);
Johannes Bergcd3468b2009-07-29 22:07:44 +0200222 if (!ie)
223 return false;
Rui Paulo136cfa22009-11-18 18:40:00 +0000224 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
Johannes Berg2a519312009-02-10 21:25:55 +0100225 return false;
226
227 /*
228 * Ignore mesh capability (last two bytes of the IE) when
229 * comparing since that may differ between stations taking
230 * part in the same mesh.
231 */
Rui Paulo136cfa22009-11-18 18:40:00 +0000232 return memcmp(ie + 2, meshcfg,
233 sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
Johannes Berg2a519312009-02-10 21:25:55 +0100234}
235
236static int cmp_bss(struct cfg80211_bss *a,
237 struct cfg80211_bss *b)
238{
239 int r;
240
241 if (a->channel != b->channel)
242 return b->channel->center_freq - a->channel->center_freq;
243
244 r = memcmp(a->bssid, b->bssid, ETH_ALEN);
245 if (r)
246 return r;
247
248 if (is_zero_ether_addr(a->bssid)) {
249 r = cmp_ies(WLAN_EID_MESH_ID,
250 a->information_elements,
251 a->len_information_elements,
252 b->information_elements,
253 b->len_information_elements);
254 if (r)
255 return r;
256 return cmp_ies(WLAN_EID_MESH_CONFIG,
257 a->information_elements,
258 a->len_information_elements,
259 b->information_elements,
260 b->len_information_elements);
261 }
262
263 return cmp_ies(WLAN_EID_SSID,
264 a->information_elements,
265 a->len_information_elements,
266 b->information_elements,
267 b->len_information_elements);
268}
269
270struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
271 struct ieee80211_channel *channel,
272 const u8 *bssid,
Johannes Berg79420f02009-02-10 21:25:59 +0100273 const u8 *ssid, size_t ssid_len,
274 u16 capa_mask, u16 capa_val)
Johannes Berg2a519312009-02-10 21:25:55 +0100275{
276 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
277 struct cfg80211_internal_bss *bss, *res = NULL;
Johannes Bergccb6c132010-07-13 10:55:38 +0200278 unsigned long now = jiffies;
Johannes Berg2a519312009-02-10 21:25:55 +0100279
280 spin_lock_bh(&dev->bss_lock);
281
282 list_for_each_entry(bss, &dev->bss_list, list) {
Johannes Berg79420f02009-02-10 21:25:59 +0100283 if ((bss->pub.capability & capa_mask) != capa_val)
284 continue;
Johannes Berg2a519312009-02-10 21:25:55 +0100285 if (channel && bss->pub.channel != channel)
286 continue;
Johannes Bergccb6c132010-07-13 10:55:38 +0200287 /* Don't get expired BSS structs */
288 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
289 !atomic_read(&bss->hold))
290 continue;
Johannes Berg2a519312009-02-10 21:25:55 +0100291 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
292 res = bss;
293 kref_get(&res->ref);
294 break;
295 }
296 }
297
298 spin_unlock_bh(&dev->bss_lock);
299 if (!res)
300 return NULL;
301 return &res->pub;
302}
303EXPORT_SYMBOL(cfg80211_get_bss);
304
305struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
306 struct ieee80211_channel *channel,
307 const u8 *meshid, size_t meshidlen,
308 const u8 *meshcfg)
309{
310 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
311 struct cfg80211_internal_bss *bss, *res = NULL;
312
313 spin_lock_bh(&dev->bss_lock);
314
315 list_for_each_entry(bss, &dev->bss_list, list) {
316 if (channel && bss->pub.channel != channel)
317 continue;
318 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
319 res = bss;
320 kref_get(&res->ref);
321 break;
322 }
323 }
324
325 spin_unlock_bh(&dev->bss_lock);
326 if (!res)
327 return NULL;
328 return &res->pub;
329}
330EXPORT_SYMBOL(cfg80211_get_mesh);
331
332
333static void rb_insert_bss(struct cfg80211_registered_device *dev,
334 struct cfg80211_internal_bss *bss)
335{
336 struct rb_node **p = &dev->bss_tree.rb_node;
337 struct rb_node *parent = NULL;
338 struct cfg80211_internal_bss *tbss;
339 int cmp;
340
341 while (*p) {
342 parent = *p;
343 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
344
345 cmp = cmp_bss(&bss->pub, &tbss->pub);
346
347 if (WARN_ON(!cmp)) {
348 /* will sort of leak this BSS */
349 return;
350 }
351
352 if (cmp < 0)
353 p = &(*p)->rb_left;
354 else
355 p = &(*p)->rb_right;
356 }
357
358 rb_link_node(&bss->rbn, parent, p);
359 rb_insert_color(&bss->rbn, &dev->bss_tree);
360}
361
362static struct cfg80211_internal_bss *
363rb_find_bss(struct cfg80211_registered_device *dev,
364 struct cfg80211_internal_bss *res)
365{
366 struct rb_node *n = dev->bss_tree.rb_node;
367 struct cfg80211_internal_bss *bss;
368 int r;
369
370 while (n) {
371 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
372 r = cmp_bss(&res->pub, &bss->pub);
373
374 if (r == 0)
375 return bss;
376 else if (r < 0)
377 n = n->rb_left;
378 else
379 n = n->rb_right;
380 }
381
382 return NULL;
383}
384
385static struct cfg80211_internal_bss *
386cfg80211_bss_update(struct cfg80211_registered_device *dev,
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200387 struct cfg80211_internal_bss *res)
Johannes Berg2a519312009-02-10 21:25:55 +0100388{
389 struct cfg80211_internal_bss *found = NULL;
390 const u8 *meshid, *meshcfg;
391
392 /*
393 * The reference to "res" is donated to this function.
394 */
395
396 if (WARN_ON(!res->pub.channel)) {
397 kref_put(&res->ref, bss_release);
398 return NULL;
399 }
400
401 res->ts = jiffies;
402
403 if (is_zero_ether_addr(res->pub.bssid)) {
404 /* must be mesh, verify */
Johannes Bergc21dbf92010-01-26 14:15:46 +0100405 meshid = cfg80211_find_ie(WLAN_EID_MESH_ID,
406 res->pub.information_elements,
407 res->pub.len_information_elements);
408 meshcfg = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
409 res->pub.information_elements,
410 res->pub.len_information_elements);
Johannes Berg2a519312009-02-10 21:25:55 +0100411 if (!meshid || !meshcfg ||
Rui Paulo136cfa22009-11-18 18:40:00 +0000412 meshcfg[1] != sizeof(struct ieee80211_meshconf_ie)) {
Johannes Berg2a519312009-02-10 21:25:55 +0100413 /* bogus mesh */
414 kref_put(&res->ref, bss_release);
415 return NULL;
416 }
417 }
418
419 spin_lock_bh(&dev->bss_lock);
420
421 found = rb_find_bss(dev, res);
422
Johannes Bergcd1658f2009-04-16 15:00:58 +0200423 if (found) {
Johannes Berg2a519312009-02-10 21:25:55 +0100424 found->pub.beacon_interval = res->pub.beacon_interval;
425 found->pub.tsf = res->pub.tsf;
426 found->pub.signal = res->pub.signal;
Johannes Berg2a519312009-02-10 21:25:55 +0100427 found->pub.capability = res->pub.capability;
428 found->ts = res->ts;
Johannes Bergcd1658f2009-04-16 15:00:58 +0200429
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200430 /* Update IEs */
431 if (res->pub.proberesp_ies) {
Johannes Bergcd1658f2009-04-16 15:00:58 +0200432 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200433 size_t ielen = res->pub.len_proberesp_ies;
Johannes Bergcd1658f2009-04-16 15:00:58 +0200434
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200435 if (found->pub.proberesp_ies &&
436 !found->proberesp_ies_allocated &&
437 ksize(found) >= used + ielen) {
438 memcpy(found->pub.proberesp_ies,
439 res->pub.proberesp_ies, ielen);
440 found->pub.len_proberesp_ies = ielen;
Johannes Bergcd1658f2009-04-16 15:00:58 +0200441 } else {
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200442 u8 *ies = found->pub.proberesp_ies;
Johannes Bergcd1658f2009-04-16 15:00:58 +0200443
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200444 if (found->proberesp_ies_allocated)
Michael Buesch273de922009-04-25 22:28:55 +0200445 ies = krealloc(ies, ielen, GFP_ATOMIC);
446 else
Johannes Bergcd1658f2009-04-16 15:00:58 +0200447 ies = kmalloc(ielen, GFP_ATOMIC);
448
449 if (ies) {
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200450 memcpy(ies, res->pub.proberesp_ies,
451 ielen);
452 found->proberesp_ies_allocated = true;
453 found->pub.proberesp_ies = ies;
454 found->pub.len_proberesp_ies = ielen;
455 }
456 }
457
458 /* Override possible earlier Beacon frame IEs */
459 found->pub.information_elements =
460 found->pub.proberesp_ies;
461 found->pub.len_information_elements =
462 found->pub.len_proberesp_ies;
463 }
464 if (res->pub.beacon_ies) {
465 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
466 size_t ielen = res->pub.len_beacon_ies;
Sven Neumann01123e22010-12-09 15:05:24 +0100467 bool information_elements_is_beacon_ies =
468 (found->pub.information_elements ==
469 found->pub.beacon_ies);
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200470
471 if (found->pub.beacon_ies &&
472 !found->beacon_ies_allocated &&
473 ksize(found) >= used + ielen) {
474 memcpy(found->pub.beacon_ies,
475 res->pub.beacon_ies, ielen);
476 found->pub.len_beacon_ies = ielen;
477 } else {
478 u8 *ies = found->pub.beacon_ies;
479
480 if (found->beacon_ies_allocated)
481 ies = krealloc(ies, ielen, GFP_ATOMIC);
482 else
483 ies = kmalloc(ielen, GFP_ATOMIC);
484
485 if (ies) {
486 memcpy(ies, res->pub.beacon_ies,
487 ielen);
488 found->beacon_ies_allocated = true;
489 found->pub.beacon_ies = ies;
490 found->pub.len_beacon_ies = ielen;
Johannes Bergcd1658f2009-04-16 15:00:58 +0200491 }
492 }
Sven Neumann01123e22010-12-09 15:05:24 +0100493
494 /* Override IEs if they were from a beacon before */
495 if (information_elements_is_beacon_ies) {
496 found->pub.information_elements =
497 found->pub.beacon_ies;
498 found->pub.len_information_elements =
499 found->pub.len_beacon_ies;
500 }
Johannes Bergcd1658f2009-04-16 15:00:58 +0200501 }
502
Johannes Berg2a519312009-02-10 21:25:55 +0100503 kref_put(&res->ref, bss_release);
504 } else {
505 /* this "consumes" the reference */
506 list_add_tail(&res->list, &dev->bss_list);
507 rb_insert_bss(dev, res);
508 found = res;
509 }
510
511 dev->bss_generation++;
512 spin_unlock_bh(&dev->bss_lock);
513
514 kref_get(&found->ref);
515 return found;
516}
517
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +0200518struct cfg80211_bss*
519cfg80211_inform_bss(struct wiphy *wiphy,
520 struct ieee80211_channel *channel,
521 const u8 *bssid,
522 u64 timestamp, u16 capability, u16 beacon_interval,
523 const u8 *ie, size_t ielen,
524 s32 signal, gfp_t gfp)
525{
526 struct cfg80211_internal_bss *res;
527 size_t privsz;
528
529 if (WARN_ON(!wiphy))
530 return NULL;
531
532 privsz = wiphy->bss_priv_size;
533
Sujith22fe88d2010-05-13 10:34:08 +0530534 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +0200535 (signal < 0 || signal > 100)))
536 return NULL;
537
538 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
539 if (!res)
540 return NULL;
541
542 memcpy(res->pub.bssid, bssid, ETH_ALEN);
543 res->pub.channel = channel;
544 res->pub.signal = signal;
545 res->pub.tsf = timestamp;
546 res->pub.beacon_interval = beacon_interval;
547 res->pub.capability = capability;
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200548 /*
549 * Since we do not know here whether the IEs are from a Beacon or Probe
550 * Response frame, we need to pick one of the options and only use it
551 * with the driver that does not provide the full Beacon/Probe Response
552 * frame. Use Beacon frame pointer to avoid indicating that this should
553 * override the information_elements pointer should we have received an
554 * earlier indication of Probe Response data.
555 *
556 * The initial buffer for the IEs is allocated with the BSS entry and
557 * is located after the private area.
558 */
559 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
560 memcpy(res->pub.beacon_ies, ie, ielen);
561 res->pub.len_beacon_ies = ielen;
562 res->pub.information_elements = res->pub.beacon_ies;
563 res->pub.len_information_elements = res->pub.len_beacon_ies;
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +0200564
565 kref_init(&res->ref);
566
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200567 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +0200568 if (!res)
569 return NULL;
570
571 if (res->pub.capability & WLAN_CAPABILITY_ESS)
572 regulatory_hint_found_beacon(wiphy, channel, gfp);
573
574 /* cfg80211_bss_update gives us a referenced result */
575 return &res->pub;
576}
577EXPORT_SYMBOL(cfg80211_inform_bss);
578
Johannes Berg2a519312009-02-10 21:25:55 +0100579struct cfg80211_bss *
580cfg80211_inform_bss_frame(struct wiphy *wiphy,
581 struct ieee80211_channel *channel,
582 struct ieee80211_mgmt *mgmt, size_t len,
Johannes Berg77965c92009-02-18 18:45:06 +0100583 s32 signal, gfp_t gfp)
Johannes Berg2a519312009-02-10 21:25:55 +0100584{
585 struct cfg80211_internal_bss *res;
586 size_t ielen = len - offsetof(struct ieee80211_mgmt,
587 u.probe_resp.variable);
Johannes Berg2a519312009-02-10 21:25:55 +0100588 size_t privsz = wiphy->bss_priv_size;
589
Sujith22fe88d2010-05-13 10:34:08 +0530590 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
Johannes Berg2a519312009-02-10 21:25:55 +0100591 (signal < 0 || signal > 100)))
592 return NULL;
593
594 if (WARN_ON(!mgmt || !wiphy ||
595 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
596 return NULL;
597
598 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
599 if (!res)
600 return NULL;
601
602 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
603 res->pub.channel = channel;
Johannes Berg2a519312009-02-10 21:25:55 +0100604 res->pub.signal = signal;
605 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
606 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
607 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200608 /*
609 * The initial buffer for the IEs is allocated with the BSS entry and
610 * is located after the private area.
611 */
612 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
613 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
614 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
615 ielen);
616 res->pub.len_proberesp_ies = ielen;
617 res->pub.information_elements = res->pub.proberesp_ies;
618 res->pub.len_information_elements = res->pub.len_proberesp_ies;
619 } else {
620 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
621 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
622 res->pub.len_beacon_ies = ielen;
623 res->pub.information_elements = res->pub.beacon_ies;
624 res->pub.len_information_elements = res->pub.len_beacon_ies;
625 }
Johannes Berg2a519312009-02-10 21:25:55 +0100626
627 kref_init(&res->ref);
628
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200629 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
Johannes Berg2a519312009-02-10 21:25:55 +0100630 if (!res)
631 return NULL;
632
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500633 if (res->pub.capability & WLAN_CAPABILITY_ESS)
634 regulatory_hint_found_beacon(wiphy, channel, gfp);
635
Johannes Berg2a519312009-02-10 21:25:55 +0100636 /* cfg80211_bss_update gives us a referenced result */
637 return &res->pub;
638}
639EXPORT_SYMBOL(cfg80211_inform_bss_frame);
640
641void cfg80211_put_bss(struct cfg80211_bss *pub)
642{
643 struct cfg80211_internal_bss *bss;
644
645 if (!pub)
646 return;
647
648 bss = container_of(pub, struct cfg80211_internal_bss, pub);
649 kref_put(&bss->ref, bss_release);
650}
651EXPORT_SYMBOL(cfg80211_put_bss);
652
Johannes Bergd491af12009-02-10 21:25:58 +0100653void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
654{
655 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
656 struct cfg80211_internal_bss *bss;
657
658 if (WARN_ON(!pub))
659 return;
660
661 bss = container_of(pub, struct cfg80211_internal_bss, pub);
662
663 spin_lock_bh(&dev->bss_lock);
Johannes Berg32073902010-10-06 21:18:04 +0200664 if (!list_empty(&bss->list)) {
665 list_del_init(&bss->list);
666 dev->bss_generation++;
667 rb_erase(&bss->rbn, &dev->bss_tree);
Johannes Bergd491af12009-02-10 21:25:58 +0100668
Johannes Berg32073902010-10-06 21:18:04 +0200669 kref_put(&bss->ref, bss_release);
670 }
Johannes Bergd491af12009-02-10 21:25:58 +0100671 spin_unlock_bh(&dev->bss_lock);
Johannes Bergd491af12009-02-10 21:25:58 +0100672}
673EXPORT_SYMBOL(cfg80211_unlink_bss);
674
Johannes Berg3d23e342009-09-29 23:27:28 +0200675#ifdef CONFIG_CFG80211_WEXT
Johannes Berg2a519312009-02-10 21:25:55 +0100676int cfg80211_wext_siwscan(struct net_device *dev,
677 struct iw_request_info *info,
678 union iwreq_data *wrqu, char *extra)
679{
680 struct cfg80211_registered_device *rdev;
681 struct wiphy *wiphy;
682 struct iw_scan_req *wreq = NULL;
Johannes Berg65486c82009-12-23 15:33:35 +0100683 struct cfg80211_scan_request *creq = NULL;
Johannes Berg2a519312009-02-10 21:25:55 +0100684 int i, err, n_channels = 0;
685 enum ieee80211_band band;
686
687 if (!netif_running(dev))
688 return -ENETDOWN;
689
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200690 if (wrqu->data.length == sizeof(struct iw_scan_req))
691 wreq = (struct iw_scan_req *)extra;
692
Johannes Berg463d0182009-07-14 00:33:35 +0200693 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
Johannes Berg2a519312009-02-10 21:25:55 +0100694
695 if (IS_ERR(rdev))
696 return PTR_ERR(rdev);
697
698 if (rdev->scan_req) {
699 err = -EBUSY;
700 goto out;
701 }
702
703 wiphy = &rdev->wiphy;
704
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200705 /* Determine number of channels, needed to allocate creq */
706 if (wreq && wreq->num_channels)
707 n_channels = wreq->num_channels;
708 else {
709 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
710 if (wiphy->bands[band])
711 n_channels += wiphy->bands[band]->n_channels;
712 }
Johannes Berg2a519312009-02-10 21:25:55 +0100713
714 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
715 n_channels * sizeof(void *),
716 GFP_ATOMIC);
717 if (!creq) {
718 err = -ENOMEM;
719 goto out;
720 }
721
722 creq->wiphy = wiphy;
Johannes Berg463d0182009-07-14 00:33:35 +0200723 creq->dev = dev;
Johannes Berg5ba63532009-08-07 17:54:07 +0200724 /* SSIDs come after channels */
725 creq->ssids = (void *)&creq->channels[n_channels];
Johannes Berg2a519312009-02-10 21:25:55 +0100726 creq->n_channels = n_channels;
727 creq->n_ssids = 1;
728
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200729 /* translate "Scan on frequencies" request */
Johannes Berg2a519312009-02-10 21:25:55 +0100730 i = 0;
731 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
732 int j;
Johannes Berg584991d2009-11-02 13:32:03 +0100733
Johannes Berg2a519312009-02-10 21:25:55 +0100734 if (!wiphy->bands[band])
735 continue;
Johannes Berg584991d2009-11-02 13:32:03 +0100736
Johannes Berg2a519312009-02-10 21:25:55 +0100737 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
Johannes Berg584991d2009-11-02 13:32:03 +0100738 /* ignore disabled channels */
739 if (wiphy->bands[band]->channels[j].flags &
740 IEEE80211_CHAN_DISABLED)
741 continue;
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200742
743 /* If we have a wireless request structure and the
744 * wireless request specifies frequencies, then search
745 * for the matching hardware channel.
746 */
747 if (wreq && wreq->num_channels) {
748 int k;
749 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
750 for (k = 0; k < wreq->num_channels; k++) {
Holger Schuriga4e7b732009-09-11 10:13:53 +0200751 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200752 if (wext_freq == wiphy_freq)
753 goto wext_freq_found;
754 }
755 goto wext_freq_not_found;
756 }
757
758 wext_freq_found:
Johannes Berg2a519312009-02-10 21:25:55 +0100759 creq->channels[i] = &wiphy->bands[band]->channels[j];
760 i++;
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200761 wext_freq_not_found: ;
Johannes Berg2a519312009-02-10 21:25:55 +0100762 }
763 }
Holger Schurig8862dc52009-09-11 10:13:55 +0200764 /* No channels found? */
765 if (!i) {
766 err = -EINVAL;
767 goto out;
768 }
Johannes Berg2a519312009-02-10 21:25:55 +0100769
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200770 /* Set real number of channels specified in creq->channels[] */
771 creq->n_channels = i;
Johannes Berg2a519312009-02-10 21:25:55 +0100772
Holger Schurigb2e3abd2009-09-09 13:09:54 +0200773 /* translate "Scan for SSID" request */
774 if (wreq) {
Johannes Berg2a519312009-02-10 21:25:55 +0100775 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
Johannes Berg65486c82009-12-23 15:33:35 +0100776 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
777 err = -EINVAL;
778 goto out;
779 }
Johannes Berg2a519312009-02-10 21:25:55 +0100780 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
781 creq->ssids[0].ssid_len = wreq->essid_len;
782 }
783 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
784 creq->n_ssids = 0;
785 }
786
787 rdev->scan_req = creq;
788 err = rdev->ops->scan(wiphy, dev, creq);
789 if (err) {
790 rdev->scan_req = NULL;
Johannes Berg65486c82009-12-23 15:33:35 +0100791 /* creq will be freed below */
Johannes Berg463d0182009-07-14 00:33:35 +0200792 } else {
Johannes Berga538e2d2009-06-16 19:56:42 +0200793 nl80211_send_scan_start(rdev, dev);
Johannes Berg65486c82009-12-23 15:33:35 +0100794 /* creq now owned by driver */
795 creq = NULL;
Johannes Berg463d0182009-07-14 00:33:35 +0200796 dev_hold(dev);
797 }
Johannes Berg2a519312009-02-10 21:25:55 +0100798 out:
Johannes Berg65486c82009-12-23 15:33:35 +0100799 kfree(creq);
Johannes Berg4d0c8ae2009-07-07 03:56:09 +0200800 cfg80211_unlock_rdev(rdev);
Johannes Berg2a519312009-02-10 21:25:55 +0100801 return err;
802}
Johannes Bergba44cb72009-04-20 18:49:39 +0200803EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
Johannes Berg2a519312009-02-10 21:25:55 +0100804
805static void ieee80211_scan_add_ies(struct iw_request_info *info,
806 struct cfg80211_bss *bss,
807 char **current_ev, char *end_buf)
808{
809 u8 *pos, *end, *next;
810 struct iw_event iwe;
811
812 if (!bss->information_elements ||
813 !bss->len_information_elements)
814 return;
815
816 /*
817 * If needed, fragment the IEs buffer (at IE boundaries) into short
818 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
819 */
820 pos = bss->information_elements;
821 end = pos + bss->len_information_elements;
822
823 while (end - pos > IW_GENERIC_IE_MAX) {
824 next = pos + 2 + pos[1];
825 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
826 next = next + 2 + next[1];
827
828 memset(&iwe, 0, sizeof(iwe));
829 iwe.cmd = IWEVGENIE;
830 iwe.u.data.length = next - pos;
831 *current_ev = iwe_stream_add_point(info, *current_ev,
832 end_buf, &iwe, pos);
833
834 pos = next;
835 }
836
837 if (end > pos) {
838 memset(&iwe, 0, sizeof(iwe));
839 iwe.cmd = IWEVGENIE;
840 iwe.u.data.length = end - pos;
841 *current_ev = iwe_stream_add_point(info, *current_ev,
842 end_buf, &iwe, pos);
843 }
844}
845
Dan Williamscb3a8ee2009-02-11 17:14:43 -0500846static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
847{
848 unsigned long end = jiffies;
849
850 if (end >= start)
851 return jiffies_to_msecs(end - start);
852
853 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
854}
Johannes Berg2a519312009-02-10 21:25:55 +0100855
856static char *
Johannes Berg77965c92009-02-18 18:45:06 +0100857ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
858 struct cfg80211_internal_bss *bss, char *current_ev,
859 char *end_buf)
Johannes Berg2a519312009-02-10 21:25:55 +0100860{
861 struct iw_event iwe;
862 u8 *buf, *cfg, *p;
863 u8 *ie = bss->pub.information_elements;
Johannes Berga77b8552009-02-18 18:27:22 +0100864 int rem = bss->pub.len_information_elements, i, sig;
Johannes Berg2a519312009-02-10 21:25:55 +0100865 bool ismesh = false;
866
867 memset(&iwe, 0, sizeof(iwe));
868 iwe.cmd = SIOCGIWAP;
869 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
870 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
871 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
872 IW_EV_ADDR_LEN);
873
874 memset(&iwe, 0, sizeof(iwe));
875 iwe.cmd = SIOCGIWFREQ;
876 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
877 iwe.u.freq.e = 0;
878 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
879 IW_EV_FREQ_LEN);
880
881 memset(&iwe, 0, sizeof(iwe));
882 iwe.cmd = SIOCGIWFREQ;
883 iwe.u.freq.m = bss->pub.channel->center_freq;
884 iwe.u.freq.e = 6;
885 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
886 IW_EV_FREQ_LEN);
887
Johannes Berg77965c92009-02-18 18:45:06 +0100888 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
Johannes Berg2a519312009-02-10 21:25:55 +0100889 memset(&iwe, 0, sizeof(iwe));
890 iwe.cmd = IWEVQUAL;
891 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
892 IW_QUAL_NOISE_INVALID |
Johannes Berga77b8552009-02-18 18:27:22 +0100893 IW_QUAL_QUAL_UPDATED;
Johannes Berg77965c92009-02-18 18:45:06 +0100894 switch (wiphy->signal_type) {
Johannes Berg2a519312009-02-10 21:25:55 +0100895 case CFG80211_SIGNAL_TYPE_MBM:
Johannes Berga77b8552009-02-18 18:27:22 +0100896 sig = bss->pub.signal / 100;
897 iwe.u.qual.level = sig;
Johannes Berg2a519312009-02-10 21:25:55 +0100898 iwe.u.qual.updated |= IW_QUAL_DBM;
Johannes Berga77b8552009-02-18 18:27:22 +0100899 if (sig < -110) /* rather bad */
900 sig = -110;
901 else if (sig > -40) /* perfect */
902 sig = -40;
903 /* will give a range of 0 .. 70 */
904 iwe.u.qual.qual = sig + 110;
Johannes Berg2a519312009-02-10 21:25:55 +0100905 break;
906 case CFG80211_SIGNAL_TYPE_UNSPEC:
907 iwe.u.qual.level = bss->pub.signal;
Johannes Berga77b8552009-02-18 18:27:22 +0100908 /* will give range 0 .. 100 */
909 iwe.u.qual.qual = bss->pub.signal;
Johannes Berg2a519312009-02-10 21:25:55 +0100910 break;
911 default:
912 /* not reached */
913 break;
914 }
915 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
916 &iwe, IW_EV_QUAL_LEN);
917 }
918
919 memset(&iwe, 0, sizeof(iwe));
920 iwe.cmd = SIOCGIWENCODE;
921 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
922 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
923 else
924 iwe.u.data.flags = IW_ENCODE_DISABLED;
925 iwe.u.data.length = 0;
926 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
927 &iwe, "");
928
929 while (rem >= 2) {
930 /* invalid data */
931 if (ie[1] > rem - 2)
932 break;
933
934 switch (ie[0]) {
935 case WLAN_EID_SSID:
936 memset(&iwe, 0, sizeof(iwe));
937 iwe.cmd = SIOCGIWESSID;
938 iwe.u.data.length = ie[1];
939 iwe.u.data.flags = 1;
940 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
941 &iwe, ie + 2);
942 break;
943 case WLAN_EID_MESH_ID:
944 memset(&iwe, 0, sizeof(iwe));
945 iwe.cmd = SIOCGIWESSID;
946 iwe.u.data.length = ie[1];
947 iwe.u.data.flags = 1;
948 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
949 &iwe, ie + 2);
950 break;
951 case WLAN_EID_MESH_CONFIG:
952 ismesh = true;
Rui Paulo136cfa22009-11-18 18:40:00 +0000953 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
Johannes Berg2a519312009-02-10 21:25:55 +0100954 break;
955 buf = kmalloc(50, GFP_ATOMIC);
956 if (!buf)
957 break;
958 cfg = ie + 2;
959 memset(&iwe, 0, sizeof(iwe));
960 iwe.cmd = IWEVCUSTOM;
Rui Paulo76aa5e72009-11-18 18:22:59 +0000961 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
962 "0x%02X", cfg[0]);
Johannes Berg2a519312009-02-10 21:25:55 +0100963 iwe.u.data.length = strlen(buf);
964 current_ev = iwe_stream_add_point(info, current_ev,
965 end_buf,
966 &iwe, buf);
Rui Paulo76aa5e72009-11-18 18:22:59 +0000967 sprintf(buf, "Path Selection Metric ID: 0x%02X",
968 cfg[1]);
Johannes Berg2a519312009-02-10 21:25:55 +0100969 iwe.u.data.length = strlen(buf);
970 current_ev = iwe_stream_add_point(info, current_ev,
971 end_buf,
972 &iwe, buf);
Rui Paulo76aa5e72009-11-18 18:22:59 +0000973 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
974 cfg[2]);
Johannes Berg2a519312009-02-10 21:25:55 +0100975 iwe.u.data.length = strlen(buf);
976 current_ev = iwe_stream_add_point(info, current_ev,
977 end_buf,
978 &iwe, buf);
Rui Paulo76aa5e72009-11-18 18:22:59 +0000979 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
Johannes Berg2a519312009-02-10 21:25:55 +0100980 iwe.u.data.length = strlen(buf);
981 current_ev = iwe_stream_add_point(info, current_ev,
982 end_buf,
983 &iwe, buf);
Rui Paulo76aa5e72009-11-18 18:22:59 +0000984 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
985 iwe.u.data.length = strlen(buf);
986 current_ev = iwe_stream_add_point(info, current_ev,
987 end_buf,
988 &iwe, buf);
989 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
990 iwe.u.data.length = strlen(buf);
991 current_ev = iwe_stream_add_point(info, current_ev,
992 end_buf,
993 &iwe, buf);
994 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
Johannes Berg2a519312009-02-10 21:25:55 +0100995 iwe.u.data.length = strlen(buf);
996 current_ev = iwe_stream_add_point(info, current_ev,
997 end_buf,
998 &iwe, buf);
999 kfree(buf);
1000 break;
1001 case WLAN_EID_SUPP_RATES:
1002 case WLAN_EID_EXT_SUPP_RATES:
1003 /* display all supported rates in readable format */
1004 p = current_ev + iwe_stream_lcp_len(info);
1005
1006 memset(&iwe, 0, sizeof(iwe));
1007 iwe.cmd = SIOCGIWRATE;
1008 /* Those two flags are ignored... */
1009 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1010
1011 for (i = 0; i < ie[1]; i++) {
1012 iwe.u.bitrate.value =
1013 ((ie[i + 2] & 0x7f) * 500000);
1014 p = iwe_stream_add_value(info, current_ev, p,
1015 end_buf, &iwe, IW_EV_PARAM_LEN);
1016 }
1017 current_ev = p;
1018 break;
1019 }
1020 rem -= ie[1] + 2;
1021 ie += ie[1] + 2;
1022 }
1023
Joe Perchesf64f9e72009-11-29 16:55:45 -08001024 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1025 ismesh) {
Johannes Berg2a519312009-02-10 21:25:55 +01001026 memset(&iwe, 0, sizeof(iwe));
1027 iwe.cmd = SIOCGIWMODE;
1028 if (ismesh)
1029 iwe.u.mode = IW_MODE_MESH;
1030 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1031 iwe.u.mode = IW_MODE_MASTER;
1032 else
1033 iwe.u.mode = IW_MODE_ADHOC;
1034 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1035 &iwe, IW_EV_UINT_LEN);
1036 }
1037
1038 buf = kmalloc(30, GFP_ATOMIC);
1039 if (buf) {
1040 memset(&iwe, 0, sizeof(iwe));
1041 iwe.cmd = IWEVCUSTOM;
1042 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1043 iwe.u.data.length = strlen(buf);
1044 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1045 &iwe, buf);
1046 memset(&iwe, 0, sizeof(iwe));
1047 iwe.cmd = IWEVCUSTOM;
Dan Williamscb3a8ee2009-02-11 17:14:43 -05001048 sprintf(buf, " Last beacon: %ums ago",
1049 elapsed_jiffies_msecs(bss->ts));
Johannes Berg2a519312009-02-10 21:25:55 +01001050 iwe.u.data.length = strlen(buf);
1051 current_ev = iwe_stream_add_point(info, current_ev,
1052 end_buf, &iwe, buf);
1053 kfree(buf);
1054 }
1055
1056 ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
1057
1058 return current_ev;
1059}
1060
1061
1062static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1063 struct iw_request_info *info,
1064 char *buf, size_t len)
1065{
1066 char *current_ev = buf;
1067 char *end_buf = buf + len;
1068 struct cfg80211_internal_bss *bss;
1069
1070 spin_lock_bh(&dev->bss_lock);
1071 cfg80211_bss_expire(dev);
1072
1073 list_for_each_entry(bss, &dev->bss_list, list) {
1074 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1075 spin_unlock_bh(&dev->bss_lock);
1076 return -E2BIG;
1077 }
Johannes Berg77965c92009-02-18 18:45:06 +01001078 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1079 current_ev, end_buf);
Johannes Berg2a519312009-02-10 21:25:55 +01001080 }
1081 spin_unlock_bh(&dev->bss_lock);
1082 return current_ev - buf;
1083}
1084
1085
1086int cfg80211_wext_giwscan(struct net_device *dev,
1087 struct iw_request_info *info,
1088 struct iw_point *data, char *extra)
1089{
1090 struct cfg80211_registered_device *rdev;
1091 int res;
1092
1093 if (!netif_running(dev))
1094 return -ENETDOWN;
1095
Johannes Berg463d0182009-07-14 00:33:35 +02001096 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
Johannes Berg2a519312009-02-10 21:25:55 +01001097
1098 if (IS_ERR(rdev))
1099 return PTR_ERR(rdev);
1100
1101 if (rdev->scan_req) {
1102 res = -EAGAIN;
1103 goto out;
1104 }
1105
1106 res = ieee80211_scan_results(rdev, info, extra, data->length);
1107 data->length = 0;
1108 if (res >= 0) {
1109 data->length = res;
1110 res = 0;
1111 }
1112
1113 out:
Johannes Berg4d0c8ae2009-07-07 03:56:09 +02001114 cfg80211_unlock_rdev(rdev);
Johannes Berg2a519312009-02-10 21:25:55 +01001115 return res;
1116}
Johannes Bergba44cb72009-04-20 18:49:39 +02001117EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
Johannes Berg2a519312009-02-10 21:25:55 +01001118#endif