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Merge tag 'iio-fixes-for-5.3b' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23...
[mirror_ubuntu-eoan-kernel.git] / net / wireless / scan.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
2a519311
JB		 2/*
3 * cfg80211 scan result handling
4 *
5 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
2740f0cf 6 * Copyright 2013-2014 Intel Mobile Communications GmbH
1d76250b 7 * Copyright 2016 Intel Deutschland GmbH
0b8fb823 8 * Copyright (C) 2018-2019 Intel Corporation
2a519311
JB		 9 */
10#include <linux/kernel.h>
5a0e3ad6 11#include <linux/slab.h>
2a519311
JB		 12#include <linux/module.h>
13#include <linux/netdevice.h>
14#include <linux/wireless.h>
15#include <linux/nl80211.h>
16#include <linux/etherdevice.h>
17#include <net/arp.h>
18#include <net/cfg80211.h>
262eb9b2 19#include <net/cfg80211-wext.h>
2a519311
JB		 20#include <net/iw_handler.h>
21#include "core.h"
22#include "nl80211.h"
a9a11622 23#include "wext-compat.h"
e35e4d28 24#include "rdev-ops.h"
2a519311 25
776b3580
JB		 26/**
27 * DOC: BSS tree/list structure
28 *
29 * At the top level, the BSS list is kept in both a list in each
30 * registered device (@bss_list) as well as an RB-tree for faster
31 * lookup. In the RB-tree, entries can be looked up using their
32 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
33 * for other BSSes.
34 *
35 * Due to the possibility of hidden SSIDs, there's a second level
36 * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
37 * The hidden_list connects all BSSes belonging to a single AP
38 * that has a hidden SSID, and connects beacon and probe response
39 * entries. For a probe response entry for a hidden SSID, the
40 * hidden_beacon_bss pointer points to the BSS struct holding the
41 * beacon's information.
42 *
43 * Reference counting is done for all these references except for
44 * the hidden_list, so that a beacon BSS struct that is otherwise
45 * not referenced has one reference for being on the bss_list and
46 * one for each probe response entry that points to it using the
47 * hidden_beacon_bss pointer. When a BSS struct that has such a
48 * pointer is get/put, the refcount update is also propagated to
49 * the referenced struct, this ensure that it cannot get removed
50 * while somebody is using the probe response version.
51 *
52 * Note that the hidden_beacon_bss pointer never changes, due to
53 * the reference counting. Therefore, no locking is needed for
54 * it.
55 *
56 * Also note that the hidden_beacon_bss pointer is only relevant
57 * if the driver uses something other than the IEs, e.g. private
58 * data stored stored in the BSS struct, since the beacon IEs are
59 * also linked into the probe response struct.
60 */
61
9853a55e
JB		 62/*
63 * Limit the number of BSS entries stored in mac80211. Each one is
64 * a bit over 4k at most, so this limits to roughly 4-5M of memory.
65 * If somebody wants to really attack this though, they'd likely
66 * use small beacons, and only one type of frame, limiting each of
67 * the entries to a much smaller size (in order to generate more
68 * entries in total, so overhead is bigger.)
69 */
70static int bss_entries_limit = 1000;
71module_param(bss_entries_limit, int, 0644);
72MODULE_PARM_DESC(bss_entries_limit,
73 "limit to number of scan BSS entries (per wiphy, default 1000)");
74
f9616e0f 75#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
2a519311 76
776b3580 77static void bss_free(struct cfg80211_internal_bss *bss)
e8e27c66 78{
9caf0364 79 struct cfg80211_bss_ies *ies;
b629ea3d
JB		 80
81 if (WARN_ON(atomic_read(&bss->hold)))
82 return;
83
9caf0364 84 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
776b3580 85 if (ies && !bss->pub.hidden_beacon_bss)
9caf0364
JB		 86 kfree_rcu(ies, rcu_head);
87 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
88 if (ies)
89 kfree_rcu(ies, rcu_head);
e8e27c66 90
776b3580
JB		 91 /*
92 * This happens when the module is removed, it doesn't
93 * really matter any more save for completeness
94 */
95 if (!list_empty(&bss->hidden_list))
96 list_del(&bss->hidden_list);
97
e8e27c66
AK		 98 kfree(bss);
99}
100
1b8ec87a 101static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
776b3580 102 struct cfg80211_internal_bss *bss)
0532d4f1 103{
1b8ec87a 104 lockdep_assert_held(&rdev->bss_lock);
776b3580
JB		 105
106 bss->refcount++;
107 if (bss->pub.hidden_beacon_bss) {
108 bss = container_of(bss->pub.hidden_beacon_bss,
109 struct cfg80211_internal_bss,
110 pub);
111 bss->refcount++;
112 }
7011ba58
SS		 113 if (bss->pub.transmitted_bss) {
114 bss = container_of(bss->pub.transmitted_bss,
a3584f56
SS		 115 struct cfg80211_internal_bss,
116 pub);
117 bss->refcount++;
118 }
0532d4f1
JB		 119}
120
1b8ec87a 121static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
776b3580 122 struct cfg80211_internal_bss *bss)
0532d4f1 123{
1b8ec87a 124 lockdep_assert_held(&rdev->bss_lock);
776b3580
JB		 125
126 if (bss->pub.hidden_beacon_bss) {
127 struct cfg80211_internal_bss *hbss;
128 hbss = container_of(bss->pub.hidden_beacon_bss,
129 struct cfg80211_internal_bss,
130 pub);
131 hbss->refcount--;
132 if (hbss->refcount == 0)
133 bss_free(hbss);
134 }
a3584f56 135
7011ba58 136 if (bss->pub.transmitted_bss) {
a3584f56
SS		 137 struct cfg80211_internal_bss *tbss;
138
7011ba58 139 tbss = container_of(bss->pub.transmitted_bss,
a3584f56
SS		 140 struct cfg80211_internal_bss,
141 pub);
142 tbss->refcount--;
143 if (tbss->refcount == 0)
144 bss_free(tbss);
145 }
146
776b3580
JB		 147 bss->refcount--;
148 if (bss->refcount == 0)
149 bss_free(bss);
0532d4f1
JB		 150}
151
1b8ec87a 152static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
e8e27c66
AK		 153 struct cfg80211_internal_bss *bss)
154{
1b8ec87a 155 lockdep_assert_held(&rdev->bss_lock);
4b1af479 156
776b3580
JB		 157 if (!list_empty(&bss->hidden_list)) {
158 /*
159 * don't remove the beacon entry if it has
160 * probe responses associated with it
161 */
162 if (!bss->pub.hidden_beacon_bss)
163 return false;
164 /*
165 * if it's a probe response entry break its
166 * link to the other entries in the group
167 */
168 list_del_init(&bss->hidden_list);
169 }
170
e8e27c66 171 list_del_init(&bss->list);
7011ba58 172 list_del_init(&bss->pub.nontrans_list);
1b8ec87a 173 rb_erase(&bss->rbn, &rdev->bss_tree);
9853a55e
JB		 174 rdev->bss_entries--;
175 WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
176 "rdev bss entries[%d]/list[empty:%d] corruption\n",
177 rdev->bss_entries, list_empty(&rdev->bss_list));
1b8ec87a 178 bss_ref_put(rdev, bss);
776b3580 179 return true;
e8e27c66
AK		 180}
181
f7dacfb1
SS		 182bool cfg80211_is_element_inherited(const struct element *elem,
183 const struct element *non_inherit_elem)
184{
185 u8 id_len, ext_id_len, i, loop_len, id;
186 const u8 *list;
187
188 if (elem->id == WLAN_EID_MULTIPLE_BSSID)
189 return false;
190
191 if (!non_inherit_elem || non_inherit_elem->datalen < 2)
192 return true;
193
194 /*
195 * non inheritance element format is:
196 * ext ID (56) | IDs list len | list | extension IDs list len | list
197 * Both lists are optional. Both lengths are mandatory.
198 * This means valid length is:
199 * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths
200 */
201 id_len = non_inherit_elem->data[1];
202 if (non_inherit_elem->datalen < 3 + id_len)
203 return true;
204
205 ext_id_len = non_inherit_elem->data[2 + id_len];
206 if (non_inherit_elem->datalen < 3 + id_len + ext_id_len)
207 return true;
208
209 if (elem->id == WLAN_EID_EXTENSION) {
210 if (!ext_id_len)
211 return true;
212 loop_len = ext_id_len;
213 list = &non_inherit_elem->data[3 + id_len];
214 id = elem->data[0];
215 } else {
216 if (!id_len)
217 return true;
218 loop_len = id_len;
219 list = &non_inherit_elem->data[2];
220 id = elem->id;
221 }
222
223 for (i = 0; i < loop_len; i++) {
224 if (list[i] == id)
225 return false;
226 }
227
228 return true;
229}
230EXPORT_SYMBOL(cfg80211_is_element_inherited);
231
0b8fb823
PX		 232static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
233 const u8 *subelement, size_t subie_len,
234 u8 *new_ie, gfp_t gfp)
235{
236 u8 *pos, *tmp;
237 const u8 *tmp_old, *tmp_new;
f7dacfb1 238 const struct element *non_inherit_elem;
0b8fb823
PX		 239 u8 *sub_copy;
240
241 /* copy subelement as we need to change its content to
242 * mark an ie after it is processed.
243 */
90abf96a 244 sub_copy = kmemdup(subelement, subie_len, gfp);
0b8fb823
PX		 245 if (!sub_copy)
246 return 0;
0b8fb823
PX		 247
248 pos = &new_ie[0];
249
250 /* set new ssid */
251 tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len);
252 if (tmp_new) {
253 memcpy(pos, tmp_new, tmp_new[1] + 2);
254 pos += (tmp_new[1] + 2);
255 }
256
f7dacfb1
SS		 257 /* get non inheritance list if exists */
258 non_inherit_elem =
259 cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
260 sub_copy, subie_len);
261
0b8fb823
PX		 262 /* go through IEs in ie (skip SSID) and subelement,
263 * merge them into new_ie
264 */
265 tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
266 tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie;
267
268 while (tmp_old + tmp_old[1] + 2 - ie <= ielen) {
269 if (tmp_old[0] == 0) {
270 tmp_old++;
271 continue;
272 }
273
c17fe043
SS		 274 if (tmp_old[0] == WLAN_EID_EXTENSION)
275 tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy,
276 subie_len);
277 else
278 tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy,
279 subie_len);
280
0b8fb823 281 if (!tmp) {
f7dacfb1
SS		 282 const struct element *old_elem = (void *)tmp_old;
283
0b8fb823 284 /* ie in old ie but not in subelement */
f7dacfb1
SS		 285 if (cfg80211_is_element_inherited(old_elem,
286 non_inherit_elem)) {
0b8fb823
PX		 287 memcpy(pos, tmp_old, tmp_old[1] + 2);
288 pos += tmp_old[1] + 2;
289 }
290 } else {
291 /* ie in transmitting ie also in subelement,
292 * copy from subelement and flag the ie in subelement
c17fe043
SS		 293 * as copied (by setting eid field to WLAN_EID_SSID,
294 * which is skipped anyway).
295 * For vendor ie, compare OUI + type + subType to
0b8fb823
PX		 296 * determine if they are the same ie.
297 */
298 if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) {
299 if (!memcmp(tmp_old + 2, tmp + 2, 5)) {
300 /* same vendor ie, copy from
301 * subelement
302 */
303 memcpy(pos, tmp, tmp[1] + 2);
304 pos += tmp[1] + 2;
c17fe043 305 tmp[0] = WLAN_EID_SSID;
0b8fb823
PX		 306 } else {
307 memcpy(pos, tmp_old, tmp_old[1] + 2);
308 pos += tmp_old[1] + 2;
309 }
310 } else {
311 /* copy ie from subelement into new ie */
312 memcpy(pos, tmp, tmp[1] + 2);
313 pos += tmp[1] + 2;
c17fe043 314 tmp[0] = WLAN_EID_SSID;
0b8fb823
PX		 315 }
316 }
317
318 if (tmp_old + tmp_old[1] + 2 - ie == ielen)
319 break;
320
321 tmp_old += tmp_old[1] + 2;
322 }
323
324 /* go through subelement again to check if there is any ie not
325 * copied to new ie, skip ssid, capability, bssid-index ie
326 */
327 tmp_new = sub_copy;
328 while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) {
329 if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP ||
5bd9d108 330 tmp_new[0] == WLAN_EID_SSID)) {
0b8fb823
PX		 331 memcpy(pos, tmp_new, tmp_new[1] + 2);
332 pos += tmp_new[1] + 2;
333 }
334 if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len)
335 break;
336 tmp_new += tmp_new[1] + 2;
337 }
338
339 kfree(sub_copy);
340 return pos - new_ie;
341}
342
343static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
344 const u8 *ssid, size_t ssid_len)
345{
346 const struct cfg80211_bss_ies *ies;
347 const u8 *ssidie;
348
349 if (bssid && !ether_addr_equal(a->bssid, bssid))
350 return false;
351
352 if (!ssid)
353 return true;
354
355 ies = rcu_access_pointer(a->ies);
356 if (!ies)
357 return false;
358 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
359 if (!ssidie)
360 return false;
361 if (ssidie[1] != ssid_len)
362 return false;
363 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
364}
365
366static int
7011ba58
SS		 367cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
368 struct cfg80211_bss *nontrans_bss)
0b8fb823
PX		 369{
370 const u8 *ssid;
371 size_t ssid_len;
7011ba58 372 struct cfg80211_bss *bss = NULL;
0b8fb823
PX		 373
374 rcu_read_lock();
7011ba58 375 ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
0b8fb823
PX		 376 if (!ssid) {
377 rcu_read_unlock();
378 return -EINVAL;
379 }
380 ssid_len = ssid[1];
381 ssid = ssid + 2;
382 rcu_read_unlock();
383
384 /* check if nontrans_bss is in the list */
385 list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
7011ba58 386 if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len))
0b8fb823
PX		 387 return 0;
388 }
389
390 /* add to the list */
391 list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
392 return 0;
393}
394
1b8ec87a 395static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
15d6030b
SL		 396 unsigned long expire_time)
397{
398 struct cfg80211_internal_bss *bss, *tmp;
399 bool expired = false;
400
1b8ec87a 401 lockdep_assert_held(&rdev->bss_lock);
4b1af479 402
1b8ec87a 403 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
15d6030b
SL		 404 if (atomic_read(&bss->hold))
405 continue;
406 if (!time_after(expire_time, bss->ts))
407 continue;
408
1b8ec87a 409 if (__cfg80211_unlink_bss(rdev, bss))
776b3580 410 expired = true;
15d6030b
SL		 411 }
412
413 if (expired)
1b8ec87a 414 rdev->bss_generation++;
15d6030b
SL		 415}
416
9853a55e
JB		 417static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
418{
419 struct cfg80211_internal_bss *bss, *oldest = NULL;
420 bool ret;
421
422 lockdep_assert_held(&rdev->bss_lock);
423
424 list_for_each_entry(bss, &rdev->bss_list, list) {
425 if (atomic_read(&bss->hold))
426 continue;
427
428 if (!list_empty(&bss->hidden_list) &&
429 !bss->pub.hidden_beacon_bss)
430 continue;
431
432 if (oldest && time_before(oldest->ts, bss->ts))
433 continue;
434 oldest = bss;
435 }
436
437 if (WARN_ON(!oldest))
438 return false;
439
440 /*
441 * The callers make sure to increase rdev->bss_generation if anything
442 * gets removed (and a new entry added), so there's no need to also do
443 * it here.
444 */
445
446 ret = __cfg80211_unlink_bss(rdev, oldest);
447 WARN_ON(!ret);
448 return ret;
449}
450
f9d15d16
JB		 451void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
452 bool send_message)
2a519311 453{
667503dd 454 struct cfg80211_scan_request *request;
fd014284 455 struct wireless_dev *wdev;
f9d15d16 456 struct sk_buff *msg;
3d23e349 457#ifdef CONFIG_CFG80211_WEXT
2a519311
JB		 458 union iwreq_data wrqu;
459#endif
460
5fe231e8 461 ASSERT_RTNL();
01a0ac41 462
f9d15d16 463 if (rdev->scan_msg) {
505a2e88 464 nl80211_send_scan_msg(rdev, rdev->scan_msg);
f9d15d16
JB		 465 rdev->scan_msg = NULL;
466 return;
467 }
667503dd 468
f9d15d16 469 request = rdev->scan_req;
01a0ac41
JB		 470 if (!request)
471 return;
472
fd014284 473 wdev = request->wdev;
2a519311 474
6829c878
JB		 475 /*
476 * This must be before sending the other events!
477 * Otherwise, wpa_supplicant gets completely confused with
478 * wext events.
479 */
fd014284
JB		 480 if (wdev->netdev)
481 cfg80211_sme_scan_done(wdev->netdev);
6829c878 482
1d76250b 483 if (!request->info.aborted &&
f9d15d16
JB		 484 request->flags & NL80211_SCAN_FLAG_FLUSH) {
485 /* flush entries from previous scans */
486 spin_lock_bh(&rdev->bss_lock);
487 __cfg80211_bss_expire(rdev, request->scan_start);
488 spin_unlock_bh(&rdev->bss_lock);
15d6030b 489 }
2a519311 490
1d76250b 491 msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
f9d15d16 492
3d23e349 493#ifdef CONFIG_CFG80211_WEXT
1d76250b 494 if (wdev->netdev && !request->info.aborted) {
2a519311
JB		 495 memset(&wrqu, 0, sizeof(wrqu));
496
fd014284 497 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
2a519311
JB		 498 }
499#endif
500
fd014284
JB		 501 if (wdev->netdev)
502 dev_put(wdev->netdev);
2a519311 503
36e6fea8 504 rdev->scan_req = NULL;
4a58e7c3 505 kfree(request);
f9d15d16
JB		 506
507 if (!send_message)
508 rdev->scan_msg = msg;
509 else
505a2e88 510 nl80211_send_scan_msg(rdev, msg);
2a519311 511}
667503dd 512
36e6fea8
JB		 513void __cfg80211_scan_done(struct work_struct *wk)
514{
515 struct cfg80211_registered_device *rdev;
516
517 rdev = container_of(wk, struct cfg80211_registered_device,
518 scan_done_wk);
519
5fe231e8 520 rtnl_lock();
f9d15d16 521 ___cfg80211_scan_done(rdev, true);
5fe231e8 522 rtnl_unlock();
36e6fea8
JB		 523}
524
1d76250b
AS		 525void cfg80211_scan_done(struct cfg80211_scan_request *request,
526 struct cfg80211_scan_info *info)
667503dd 527{
1d76250b 528 trace_cfg80211_scan_done(request, info);
f26cbf40 529 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req);
667503dd 530
1d76250b 531 request->info = *info;
5fe231e8 532 request->notified = true;
f26cbf40 533 queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
667503dd 534}
2a519311
JB		 535EXPORT_SYMBOL(cfg80211_scan_done);
536
ca986ad9
AVS		 537void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
538 struct cfg80211_sched_scan_request *req)
539{
540 ASSERT_RTNL();
541
542 list_add_rcu(&req->list, &rdev->sched_scan_req_list);
543}
544
545static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
546 struct cfg80211_sched_scan_request *req)
547{
548 ASSERT_RTNL();
549
550 list_del_rcu(&req->list);
551 kfree_rcu(req, rcu_head);
552}
553
554static struct cfg80211_sched_scan_request *
555cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
556{
557 struct cfg80211_sched_scan_request *pos;
558
1b57b621 559 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
ca986ad9 560
1b57b621 561 list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list) {
ca986ad9
AVS		 562 if (pos->reqid == reqid)
563 return pos;
564 }
b34939b9 565 return NULL;
ca986ad9
AVS		 566}
567
568/*
569 * Determines if a scheduled scan request can be handled. When a legacy
570 * scheduled scan is running no other scheduled scan is allowed regardless
571 * whether the request is for legacy or multi-support scan. When a multi-support
572 * scheduled scan is running a request for legacy scan is not allowed. In this
573 * case a request for multi-support scan can be handled if resources are
574 * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
575 */
576int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
577 bool want_multi)
578{
579 struct cfg80211_sched_scan_request *pos;
580 int i = 0;
581
582 list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
583 /* request id zero means legacy in progress */
584 if (!i && !pos->reqid)
585 return -EINPROGRESS;
586 i++;
587 }
588
589 if (i) {
590 /* no legacy allowed when multi request(s) are active */
591 if (!want_multi)
592 return -EINPROGRESS;
593
594 /* resource limit reached */
595 if (i == rdev->wiphy.max_sched_scan_reqs)
596 return -ENOSPC;
597 }
598 return 0;
599}
600
b34939b9 601void cfg80211_sched_scan_results_wk(struct work_struct *work)
807f8a8c
LC		 602{
603 struct cfg80211_registered_device *rdev;
b34939b9 604 struct cfg80211_sched_scan_request *req, *tmp;
807f8a8c 605
b34939b9
AVS		 606 rdev = container_of(work, struct cfg80211_registered_device,
607 sched_scan_res_wk);
807f8a8c 608
5fe231e8 609 rtnl_lock();
b34939b9
AVS		 610 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
611 if (req->report_results) {
612 req->report_results = false;
613 if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
614 /* flush entries from previous scans */
615 spin_lock_bh(&rdev->bss_lock);
616 __cfg80211_bss_expire(rdev, req->scan_start);
617 spin_unlock_bh(&rdev->bss_lock);
618 req->scan_start = jiffies;
619 }
620 nl80211_send_sched_scan(req,
621 NL80211_CMD_SCHED_SCAN_RESULTS);
15d6030b 622 }
15d6030b 623 }
5fe231e8 624 rtnl_unlock();
807f8a8c
LC		 625}
626
b34939b9 627void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
807f8a8c 628{
ca986ad9
AVS		 629 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
630 struct cfg80211_sched_scan_request *request;
631
b34939b9 632 trace_cfg80211_sched_scan_results(wiphy, reqid);
807f8a8c 633 /* ignore if we're not scanning */
31a60ed1 634
1b57b621 635 rcu_read_lock();
b34939b9
AVS		 636 request = cfg80211_find_sched_scan_req(rdev, reqid);
637 if (request) {
638 request->report_results = true;
639 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
640 }
1b57b621 641 rcu_read_unlock();
807f8a8c
LC		 642}
643EXPORT_SYMBOL(cfg80211_sched_scan_results);
644
b34939b9 645void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy, u64 reqid)
807f8a8c 646{
f26cbf40 647 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
807f8a8c 648
792e6aa7
EP		 649 ASSERT_RTNL();
650
b34939b9 651 trace_cfg80211_sched_scan_stopped(wiphy, reqid);
4ee3e063 652
b34939b9 653 __cfg80211_stop_sched_scan(rdev, reqid, true);
792e6aa7
EP		 654}
655EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
656
b34939b9 657void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
792e6aa7
EP		 658{
659 rtnl_lock();
b34939b9 660 cfg80211_sched_scan_stopped_rtnl(wiphy, reqid);
5fe231e8 661 rtnl_unlock();
807f8a8c 662}
807f8a8c
LC		 663EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
664
ca986ad9
AVS		 665int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
666 struct cfg80211_sched_scan_request *req,
667 bool driver_initiated)
807f8a8c 668{
5fe231e8 669 ASSERT_RTNL();
807f8a8c 670
85a9994a 671 if (!driver_initiated) {
3a3ecf1d 672 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
85a9994a
LC		 673 if (err)
674 return err;
675 }
807f8a8c 676
ca986ad9 677 nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
807f8a8c 678
ca986ad9 679 cfg80211_del_sched_scan_req(rdev, req);
807f8a8c 680
3b4670ff 681 return 0;
807f8a8c
LC		 682}
683
ca986ad9
AVS		 684int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
685 u64 reqid, bool driver_initiated)
686{
687 struct cfg80211_sched_scan_request *sched_scan_req;
688
689 ASSERT_RTNL();
690
691 sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
b34939b9
AVS		 692 if (!sched_scan_req)
693 return -ENOENT;
ca986ad9
AVS		 694
695 return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
696 driver_initiated);
697}
698
1b8ec87a 699void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
cb3a8eec
DW		 700 unsigned long age_secs)
701{
702 struct cfg80211_internal_bss *bss;
703 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
704
1b8ec87a
ZG		 705 spin_lock_bh(&rdev->bss_lock);
706 list_for_each_entry(bss, &rdev->bss_list, list)
cb3a8eec 707 bss->ts -= age_jiffies;
1b8ec87a 708 spin_unlock_bh(&rdev->bss_lock);
cb3a8eec
DW		 709}
710
1b8ec87a 711void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
2a519311 712{
1b8ec87a 713 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
2a519311
JB		 714}
715
49a68e0d
JB		 716const struct element *
717cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
718 const u8 *match, unsigned int match_len,
719 unsigned int match_offset)
2a519311 720{
0f3b07f0
JB		 721 const struct element *elem;
722
0f3b07f0 723 for_each_element_id(elem, eid, ies, len) {
49a68e0d
JB		 724 if (elem->datalen >= match_offset + match_len &&
725 !memcmp(elem->data + match_offset, match, match_len))
726 return elem;
2a519311 727 }
fbd05e4a
LC		 728
729 return NULL;
2a519311 730}
49a68e0d 731EXPORT_SYMBOL(cfg80211_find_elem_match);
2a519311 732
49a68e0d
JB		 733const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
734 const u8 *ies,
735 unsigned int len)
0c28ec58 736{
49a68e0d 737 const struct element *elem;
fbd05e4a
LC		 738 u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
739 int match_len = (oui_type < 0) ? 3 : sizeof(match);
0c28ec58 740
9e9ea439
EG		 741 if (WARN_ON(oui_type > 0xff))
742 return NULL;
743
49a68e0d
JB		 744 elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
745 match, match_len, 0);
6719429d 746
49a68e0d 747 if (!elem || elem->datalen < 4)
fbd05e4a 748 return NULL;
6719429d 749
49a68e0d 750 return elem;
0c28ec58 751}
49a68e0d 752EXPORT_SYMBOL(cfg80211_find_vendor_elem);
0c28ec58 753
4593c4cb
JB		 754/**
755 * enum bss_compare_mode - BSS compare mode
756 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
757 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
758 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
759 */
760enum bss_compare_mode {
761 BSS_CMP_REGULAR,
762 BSS_CMP_HIDE_ZLEN,
763 BSS_CMP_HIDE_NUL,
764};
765
dd9dfb9f 766static int cmp_bss(struct cfg80211_bss *a,
5622f5bb 767 struct cfg80211_bss *b,
4593c4cb 768 enum bss_compare_mode mode)
dd9dfb9f 769{
9caf0364 770 const struct cfg80211_bss_ies *a_ies, *b_ies;
3af6341c
JB		 771 const u8 *ie1 = NULL;
772 const u8 *ie2 = NULL;
5622f5bb 773 int i, r;
dd9dfb9f 774
3af6341c
JB		 775 if (a->channel != b->channel)
776 return b->channel->center_freq - a->channel->center_freq;
dd9dfb9f 777
9caf0364
JB		 778 a_ies = rcu_access_pointer(a->ies);
779 if (!a_ies)
780 return -1;
781 b_ies = rcu_access_pointer(b->ies);
782 if (!b_ies)
783 return 1;
784
3af6341c
JB		 785 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
786 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
787 a_ies->data, a_ies->len);
788 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
789 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
790 b_ies->data, b_ies->len);
791 if (ie1 && ie2) {
792 int mesh_id_cmp;
793
794 if (ie1[1] == ie2[1])
795 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
796 else
797 mesh_id_cmp = ie2[1] - ie1[1];
798
799 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
800 a_ies->data, a_ies->len);
801 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
802 b_ies->data, b_ies->len);
803 if (ie1 && ie2) {
804 if (mesh_id_cmp)
805 return mesh_id_cmp;
806 if (ie1[1] != ie2[1])
807 return ie2[1] - ie1[1];
808 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
809 }
810 }
811
3af6341c
JB		 812 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
813 if (r)
814 return r;
815
9caf0364
JB		 816 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
817 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
dd9dfb9f 818
5622f5bb
JB		 819 if (!ie1 && !ie2)
820 return 0;
821
f94f8b16 822 /*
5622f5bb
JB		 823 * Note that with "hide_ssid", the function returns a match if
824 * the already-present BSS ("b") is a hidden SSID beacon for
825 * the new BSS ("a").
f94f8b16 826 */
dd9dfb9f
DT		 827
828 /* sort missing IE before (left of) present IE */
829 if (!ie1)
830 return -1;
831 if (!ie2)
832 return 1;
833
4593c4cb
JB		 834 switch (mode) {
835 case BSS_CMP_HIDE_ZLEN:
836 /*
837 * In ZLEN mode we assume the BSS entry we're
838 * looking for has a zero-length SSID. So if
839 * the one we're looking at right now has that,
840 * return 0. Otherwise, return the difference
841 * in length, but since we're looking for the
842 * 0-length it's really equivalent to returning
843 * the length of the one we're looking at.
844 *
845 * No content comparison is needed as we assume
846 * the content length is zero.
847 */
848 return ie2[1];
849 case BSS_CMP_REGULAR:
850 default:
851 /* sort by length first, then by contents */
852 if (ie1[1] != ie2[1])
853 return ie2[1] - ie1[1];
5622f5bb 854 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
4593c4cb
JB		 855 case BSS_CMP_HIDE_NUL:
856 if (ie1[1] != ie2[1])
857 return ie2[1] - ie1[1];
858 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
859 for (i = 0; i < ie2[1]; i++)
860 if (ie2[i + 2])
861 return -1;
862 return 0;
863 }
dd9dfb9f
DT		 864}
865
6eb18137 866static bool cfg80211_bss_type_match(u16 capability,
57fbcce3 867 enum nl80211_band band,
6eb18137
DL		 868 enum ieee80211_bss_type bss_type)
869{
870 bool ret = true;
871 u16 mask, val;
872
873 if (bss_type == IEEE80211_BSS_TYPE_ANY)
874 return ret;
875
57fbcce3 876 if (band == NL80211_BAND_60GHZ) {
6eb18137
DL		 877 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
878 switch (bss_type) {
879 case IEEE80211_BSS_TYPE_ESS:
880 val = WLAN_CAPABILITY_DMG_TYPE_AP;
881 break;
882 case IEEE80211_BSS_TYPE_PBSS:
883 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
884 break;
885 case IEEE80211_BSS_TYPE_IBSS:
886 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
887 break;
888 default:
889 return false;
890 }
891 } else {
892 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
893 switch (bss_type) {
894 case IEEE80211_BSS_TYPE_ESS:
895 val = WLAN_CAPABILITY_ESS;
896 break;
897 case IEEE80211_BSS_TYPE_IBSS:
898 val = WLAN_CAPABILITY_IBSS;
899 break;
900 case IEEE80211_BSS_TYPE_MBSS:
901 val = 0;
902 break;
903 default:
904 return false;
905 }
906 }
907
908 ret = ((capability & mask) == val);
909 return ret;
910}
911
0e3a39b5 912/* Returned bss is reference counted and must be cleaned up appropriately. */
2a519311
JB		 913struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
914 struct ieee80211_channel *channel,
915 const u8 *bssid,
79420f09 916 const u8 *ssid, size_t ssid_len,
6eb18137
DL		 917 enum ieee80211_bss_type bss_type,
918 enum ieee80211_privacy privacy)
2a519311 919{
f26cbf40 920 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2a519311 921 struct cfg80211_internal_bss *bss, *res = NULL;
ccb6c136 922 unsigned long now = jiffies;
6eb18137 923 int bss_privacy;
2a519311 924
6eb18137
DL		 925 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
926 privacy);
4ee3e063 927
1b8ec87a 928 spin_lock_bh(&rdev->bss_lock);
2a519311 929
1b8ec87a 930 list_for_each_entry(bss, &rdev->bss_list, list) {
6eb18137
DL		 931 if (!cfg80211_bss_type_match(bss->pub.capability,
932 bss->pub.channel->band, bss_type))
933 continue;
934
935 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
936 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
937 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
79420f09 938 continue;
2a519311
JB		 939 if (channel && bss->pub.channel != channel)
940 continue;
c14a7400
JB		 941 if (!is_valid_ether_addr(bss->pub.bssid))
942 continue;
ccb6c136
JB		 943 /* Don't get expired BSS structs */
944 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
945 !atomic_read(&bss->hold))
946 continue;
2a519311
JB		 947 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
948 res = bss;
1b8ec87a 949 bss_ref_get(rdev, res);
2a519311
JB		 950 break;
951 }
952 }
953
1b8ec87a 954 spin_unlock_bh(&rdev->bss_lock);
2a519311
JB		 955 if (!res)
956 return NULL;
4ee3e063 957 trace_cfg80211_return_bss(&res->pub);
2a519311
JB		 958 return &res->pub;
959}
960EXPORT_SYMBOL(cfg80211_get_bss);
961
1b8ec87a 962static void rb_insert_bss(struct cfg80211_registered_device *rdev,
2a519311
JB		 963 struct cfg80211_internal_bss *bss)
964{
1b8ec87a 965 struct rb_node **p = &rdev->bss_tree.rb_node;
2a519311
JB		 966 struct rb_node *parent = NULL;
967 struct cfg80211_internal_bss *tbss;
968 int cmp;
969
970 while (*p) {
971 parent = *p;
972 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
973
4593c4cb 974 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
2a519311
JB		 975
976 if (WARN_ON(!cmp)) {
977 /* will sort of leak this BSS */
978 return;
979 }
980
981 if (cmp < 0)
982 p = &(*p)->rb_left;
983 else
984 p = &(*p)->rb_right;
985 }
986
987 rb_link_node(&bss->rbn, parent, p);
1b8ec87a 988 rb_insert_color(&bss->rbn, &rdev->bss_tree);
2a519311
JB		 989}
990
991static struct cfg80211_internal_bss *
1b8ec87a 992rb_find_bss(struct cfg80211_registered_device *rdev,
5622f5bb 993 struct cfg80211_internal_bss *res,
4593c4cb 994 enum bss_compare_mode mode)
dd9dfb9f 995{
1b8ec87a 996 struct rb_node *n = rdev->bss_tree.rb_node;
dd9dfb9f
DT		 997 struct cfg80211_internal_bss *bss;
998 int r;
999
1000 while (n) {
1001 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
4593c4cb 1002 r = cmp_bss(&res->pub, &bss->pub, mode);
dd9dfb9f
DT		 1003
1004 if (r == 0)
1005 return bss;
1006 else if (r < 0)
1007 n = n->rb_left;
1008 else
1009 n = n->rb_right;
1010 }
1011
1012 return NULL;
1013}
1014
1b8ec87a 1015static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
776b3580 1016 struct cfg80211_internal_bss *new)
dd9dfb9f 1017{
9caf0364 1018 const struct cfg80211_bss_ies *ies;
776b3580
JB		 1019 struct cfg80211_internal_bss *bss;
1020 const u8 *ie;
1021 int i, ssidlen;
1022 u8 fold = 0;
9853a55e 1023 u32 n_entries = 0;
9caf0364 1024
776b3580 1025 ies = rcu_access_pointer(new->pub.beacon_ies);
9caf0364 1026 if (WARN_ON(!ies))
776b3580 1027 return false;
dd9dfb9f 1028
776b3580
JB		 1029 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1030 if (!ie) {
1031 /* nothing to do */
1032 return true;
1033 }
1034
1035 ssidlen = ie[1];
1036 for (i = 0; i < ssidlen; i++)
1037 fold |= ie[2 + i];
1038
1039 if (fold) {
1040 /* not a hidden SSID */
1041 return true;
1042 }
1043
1044 /* This is the bad part ... */
1045
1b8ec87a 1046 list_for_each_entry(bss, &rdev->bss_list, list) {
9853a55e
JB		 1047 /*
1048 * we're iterating all the entries anyway, so take the
1049 * opportunity to validate the list length accounting
1050 */
1051 n_entries++;
1052
776b3580
JB		 1053 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
1054 continue;
1055 if (bss->pub.channel != new->pub.channel)
1056 continue;
dcd6eac1
SW		 1057 if (bss->pub.scan_width != new->pub.scan_width)
1058 continue;
776b3580
JB		 1059 if (rcu_access_pointer(bss->pub.beacon_ies))
1060 continue;
1061 ies = rcu_access_pointer(bss->pub.ies);
1062 if (!ies)
1063 continue;
1064 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1065 if (!ie)
1066 continue;
1067 if (ssidlen && ie[1] != ssidlen)
1068 continue;
776b3580
JB		 1069 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
1070 continue;
1071 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
1072 list_del(&bss->hidden_list);
1073 /* combine them */
1074 list_add(&bss->hidden_list, &new->hidden_list);
1075 bss->pub.hidden_beacon_bss = &new->pub;
1076 new->refcount += bss->refcount;
1077 rcu_assign_pointer(bss->pub.beacon_ies,
1078 new->pub.beacon_ies);
1079 }
1080
9853a55e
JB		 1081 WARN_ONCE(n_entries != rdev->bss_entries,
1082 "rdev bss entries[%d]/list[len:%d] corruption\n",
1083 rdev->bss_entries, n_entries);
1084
776b3580 1085 return true;
dd9dfb9f
DT		 1086}
1087
0cd01efb
SS		 1088struct cfg80211_non_tx_bss {
1089 struct cfg80211_bss *tx_bss;
1090 u8 max_bssid_indicator;
1091 u8 bssid_index;
1092};
1093
0e3a39b5 1094/* Returned bss is reference counted and must be cleaned up appropriately. */
a3ce17d1 1095struct cfg80211_internal_bss *
1b8ec87a 1096cfg80211_bss_update(struct cfg80211_registered_device *rdev,
3afc2167 1097 struct cfg80211_internal_bss *tmp,
a3ce17d1 1098 bool signal_valid, unsigned long ts)
2a519311
JB		 1099{
1100 struct cfg80211_internal_bss *found = NULL;
2a519311 1101
9caf0364 1102 if (WARN_ON(!tmp->pub.channel))
2a519311 1103 return NULL;
2a519311 1104
a3ce17d1 1105 tmp->ts = ts;
2a519311 1106
1b8ec87a 1107 spin_lock_bh(&rdev->bss_lock);
2a519311 1108
9caf0364 1109 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
1b8ec87a 1110 spin_unlock_bh(&rdev->bss_lock);
9caf0364
JB		 1111 return NULL;
1112 }
1113
1b8ec87a 1114 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
2a519311 1115
cd1658f5 1116 if (found) {
34a6eddb 1117 /* Update IEs */
9caf0364
JB		 1118 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1119 const struct cfg80211_bss_ies *old;
1120
1121 old = rcu_access_pointer(found->pub.proberesp_ies);
cd1658f5 1122
9caf0364
JB		 1123 rcu_assign_pointer(found->pub.proberesp_ies,
1124 tmp->pub.proberesp_ies);
34a6eddb 1125 /* Override possible earlier Beacon frame IEs */
9caf0364
JB		 1126 rcu_assign_pointer(found->pub.ies,
1127 tmp->pub.proberesp_ies);
1128 if (old)
1129 kfree_rcu((struct cfg80211_bss_ies *)old,
1130 rcu_head);
1131 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
9537f227 1132 const struct cfg80211_bss_ies *old;
776b3580
JB		 1133 struct cfg80211_internal_bss *bss;
1134
1135 if (found->pub.hidden_beacon_bss &&
1136 !list_empty(&found->hidden_list)) {
1345ee6a
JB		 1137 const struct cfg80211_bss_ies *f;
1138
776b3580
JB		 1139 /*
1140 * The found BSS struct is one of the probe
1141 * response members of a group, but we're
1142 * receiving a beacon (beacon_ies in the tmp
1143 * bss is used). This can only mean that the
1144 * AP changed its beacon from not having an
1145 * SSID to showing it, which is confusing so
1146 * drop this information.
1147 */
1345ee6a
JB		 1148
1149 f = rcu_access_pointer(tmp->pub.beacon_ies);
1150 kfree_rcu((struct cfg80211_bss_ies *)f,
1151 rcu_head);
776b3580
JB		 1152 goto drop;
1153 }
915de2ff 1154
9caf0364 1155 old = rcu_access_pointer(found->pub.beacon_ies);
9caf0364
JB		 1156
1157 rcu_assign_pointer(found->pub.beacon_ies,
1158 tmp->pub.beacon_ies);
01123e23
SN		 1159
1160 /* Override IEs if they were from a beacon before */
9537f227 1161 if (old == rcu_access_pointer(found->pub.ies))
9caf0364
JB		 1162 rcu_assign_pointer(found->pub.ies,
1163 tmp->pub.beacon_ies);
cd1658f5 1164
776b3580
JB		 1165 /* Assign beacon IEs to all sub entries */
1166 list_for_each_entry(bss, &found->hidden_list,
1167 hidden_list) {
1168 const struct cfg80211_bss_ies *ies;
1169
1170 ies = rcu_access_pointer(bss->pub.beacon_ies);
1171 WARN_ON(ies != old);
1172
1173 rcu_assign_pointer(bss->pub.beacon_ies,
1174 tmp->pub.beacon_ies);
1175 }
1176
9caf0364
JB		 1177 if (old)
1178 kfree_rcu((struct cfg80211_bss_ies *)old,
1179 rcu_head);
1180 }
1345ee6a
JB		 1181
1182 found->pub.beacon_interval = tmp->pub.beacon_interval;
3afc2167
EG		 1183 /*
1184 * don't update the signal if beacon was heard on
1185 * adjacent channel.
1186 */
1187 if (signal_valid)
1188 found->pub.signal = tmp->pub.signal;
1345ee6a
JB		 1189 found->pub.capability = tmp->pub.capability;
1190 found->ts = tmp->ts;
6e19bc4b 1191 found->ts_boottime = tmp->ts_boottime;
1d76250b 1192 found->parent_tsf = tmp->parent_tsf;
983dafaa
SD		 1193 found->pub.chains = tmp->pub.chains;
1194 memcpy(found->pub.chain_signal, tmp->pub.chain_signal,
1195 IEEE80211_MAX_CHAINS);
1d76250b 1196 ether_addr_copy(found->parent_bssid, tmp->parent_bssid);
0cd01efb
SS		 1197 found->pub.max_bssid_indicator = tmp->pub.max_bssid_indicator;
1198 found->pub.bssid_index = tmp->pub.bssid_index;
2a519311 1199 } else {
9caf0364 1200 struct cfg80211_internal_bss *new;
dd9dfb9f 1201 struct cfg80211_internal_bss *hidden;
9caf0364 1202 struct cfg80211_bss_ies *ies;
dd9dfb9f 1203
9caf0364
JB		 1204 /*
1205 * create a copy -- the "res" variable that is passed in
1206 * is allocated on the stack since it's not needed in the
1207 * more common case of an update
1208 */
1b8ec87a 1209 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
9caf0364
JB		 1210 GFP_ATOMIC);
1211 if (!new) {
1212 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1213 if (ies)
1214 kfree_rcu(ies, rcu_head);
1215 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1216 if (ies)
1217 kfree_rcu(ies, rcu_head);
776b3580 1218 goto drop;
9caf0364
JB		 1219 }
1220 memcpy(new, tmp, sizeof(*new));
776b3580
JB		 1221 new->refcount = 1;
1222 INIT_LIST_HEAD(&new->hidden_list);
7011ba58 1223 INIT_LIST_HEAD(&new->pub.nontrans_list);
776b3580
JB		 1224
1225 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1b8ec87a 1226 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
776b3580 1227 if (!hidden)
1b8ec87a 1228 hidden = rb_find_bss(rdev, tmp,
776b3580
JB		 1229 BSS_CMP_HIDE_NUL);
1230 if (hidden) {
1231 new->pub.hidden_beacon_bss = &hidden->pub;
1232 list_add(&new->hidden_list,
1233 &hidden->hidden_list);
1234 hidden->refcount++;
1235 rcu_assign_pointer(new->pub.beacon_ies,
1236 hidden->pub.beacon_ies);
1237 }
1238 } else {
1239 /*
1240 * Ok so we found a beacon, and don't have an entry. If
1241 * it's a beacon with hidden SSID, we might be in for an
1242 * expensive search for any probe responses that should
1243 * be grouped with this beacon for updates ...
1244 */
1b8ec87a 1245 if (!cfg80211_combine_bsses(rdev, new)) {
776b3580
JB		 1246 kfree(new);
1247 goto drop;
1248 }
1249 }
1250
9853a55e
JB		 1251 if (rdev->bss_entries >= bss_entries_limit &&
1252 !cfg80211_bss_expire_oldest(rdev)) {
1253 kfree(new);
1254 goto drop;
1255 }
1256
a3584f56 1257 /* This must be before the call to bss_ref_get */
0cd01efb 1258 if (tmp->pub.transmitted_bss) {
a3584f56 1259 struct cfg80211_internal_bss *pbss =
0cd01efb 1260 container_of(tmp->pub.transmitted_bss,
a3584f56
SS		 1261 struct cfg80211_internal_bss,
1262 pub);
1263
0cd01efb 1264 new->pub.transmitted_bss = tmp->pub.transmitted_bss;
a3584f56
SS		 1265 bss_ref_get(rdev, pbss);
1266 }
1267
1b8ec87a 1268 list_add_tail(&new->list, &rdev->bss_list);
9853a55e 1269 rdev->bss_entries++;
1b8ec87a 1270 rb_insert_bss(rdev, new);
9caf0364 1271 found = new;
2a519311
JB		 1272 }
1273
1b8ec87a
ZG		 1274 rdev->bss_generation++;
1275 bss_ref_get(rdev, found);
1276 spin_unlock_bh(&rdev->bss_lock);
2a519311 1277
2a519311 1278 return found;
776b3580 1279 drop:
1b8ec87a 1280 spin_unlock_bh(&rdev->bss_lock);
776b3580 1281 return NULL;
2a519311
JB		 1282}
1283
119f94a6
JM		 1284/*
1285 * Update RX channel information based on the available frame payload
1286 * information. This is mainly for the 2.4 GHz band where frames can be received
1287 * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1288 * element to indicate the current (transmitting) channel, but this might also
1289 * be needed on other bands if RX frequency does not match with the actual
1290 * operating channel of a BSS.
1291 */
0172bb75
JB		 1292static struct ieee80211_channel *
1293cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
119f94a6
JM		 1294 struct ieee80211_channel *channel,
1295 enum nl80211_bss_scan_width scan_width)
0172bb75
JB		 1296{
1297 const u8 *tmp;
1298 u32 freq;
1299 int channel_number = -1;
119f94a6 1300 struct ieee80211_channel *alt_channel;
0172bb75
JB		 1301
1302 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
1303 if (tmp && tmp[1] == 1) {
1304 channel_number = tmp[2];
1305 } else {
1306 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
1307 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
1308 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
1309
1310 channel_number = htop->primary_chan;
1311 }
1312 }
1313
119f94a6
JM		 1314 if (channel_number < 0) {
1315 /* No channel information in frame payload */
0172bb75 1316 return channel;
119f94a6 1317 }
0172bb75
JB		 1318
1319 freq = ieee80211_channel_to_frequency(channel_number, channel->band);
119f94a6
JM		 1320 alt_channel = ieee80211_get_channel(wiphy, freq);
1321 if (!alt_channel) {
1322 if (channel->band == NL80211_BAND_2GHZ) {
1323 /*
1324 * Better not allow unexpected channels when that could
1325 * be going beyond the 1-11 range (e.g., discovering
1326 * BSS on channel 12 when radio is configured for
1327 * channel 11.
1328 */
1329 return NULL;
1330 }
1331
1332 /* No match for the payload channel number - ignore it */
1333 return channel;
1334 }
1335
1336 if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
1337 scan_width == NL80211_BSS_CHAN_WIDTH_5) {
1338 /*
1339 * Ignore channel number in 5 and 10 MHz channels where there
1340 * may not be an n:1 or 1:n mapping between frequencies and
1341 * channel numbers.
1342 */
1343 return channel;
1344 }
1345
1346 /*
1347 * Use the channel determined through the payload channel number
1348 * instead of the RX channel reported by the driver.
1349 */
1350 if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
0172bb75 1351 return NULL;
119f94a6 1352 return alt_channel;
0172bb75
JB		 1353}
1354
0e3a39b5 1355/* Returned bss is reference counted and must be cleaned up appropriately. */
0b8fb823
PX		 1356static struct cfg80211_bss *
1357cfg80211_inform_single_bss_data(struct wiphy *wiphy,
1358 struct cfg80211_inform_bss *data,
1359 enum cfg80211_bss_frame_type ftype,
1360 const u8 *bssid, u64 tsf, u16 capability,
1361 u16 beacon_interval, const u8 *ie, size_t ielen,
0cd01efb 1362 struct cfg80211_non_tx_bss *non_tx_data,
0b8fb823 1363 gfp_t gfp)
06aa7afa 1364{
0b8fb823 1365 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
9caf0364 1366 struct cfg80211_bss_ies *ies;
3afc2167 1367 struct ieee80211_channel *channel;
7011ba58 1368 struct cfg80211_internal_bss tmp = {}, *res;
6eb18137 1369 int bss_type;
67af9811 1370 bool signal_valid;
06aa7afa
JK		 1371
1372 if (WARN_ON(!wiphy))
1373 return NULL;
1374
22fe88d3 1375 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
6e19bc4b 1376 (data->signal < 0 || data->signal > 100)))
06aa7afa
JK		 1377 return NULL;
1378
119f94a6
JM		 1379 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
1380 data->scan_width);
0172bb75
JB		 1381 if (!channel)
1382 return NULL;
1383
9caf0364
JB		 1384 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1385 tmp.pub.channel = channel;
6e19bc4b
DS		 1386 tmp.pub.scan_width = data->scan_width;
1387 tmp.pub.signal = data->signal;
9caf0364
JB		 1388 tmp.pub.beacon_interval = beacon_interval;
1389 tmp.pub.capability = capability;
6e19bc4b 1390 tmp.ts_boottime = data->boottime_ns;
0cd01efb
SS		 1391 if (non_tx_data) {
1392 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
1393 tmp.pub.bssid_index = non_tx_data->bssid_index;
1394 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
1395 }
6e19bc4b 1396
34a6eddb 1397 /*
5bc8c1f2 1398 * If we do not know here whether the IEs are from a Beacon or Probe
34a6eddb
JM		 1399 * Response frame, we need to pick one of the options and only use it
1400 * with the driver that does not provide the full Beacon/Probe Response
1401 * frame. Use Beacon frame pointer to avoid indicating that this should
50521aa8 1402 * override the IEs pointer should we have received an earlier
9caf0364 1403 * indication of Probe Response data.
34a6eddb 1404 */
0e227084 1405 ies = kzalloc(sizeof(*ies) + ielen, gfp);
9caf0364
JB		 1406 if (!ies)
1407 return NULL;
1408 ies->len = ielen;
8cef2c9d 1409 ies->tsf = tsf;
0e227084 1410 ies->from_beacon = false;
9caf0364 1411 memcpy(ies->data, ie, ielen);
06aa7afa 1412
5bc8c1f2
JB		 1413 switch (ftype) {
1414 case CFG80211_BSS_FTYPE_BEACON:
1415 ies->from_beacon = true;
925b5978 1416 /* fall through */
5bc8c1f2
JB		 1417 case CFG80211_BSS_FTYPE_UNKNOWN:
1418 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1419 break;
1420 case CFG80211_BSS_FTYPE_PRESP:
1421 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1422 break;
1423 }
9caf0364 1424 rcu_assign_pointer(tmp.pub.ies, ies);
06aa7afa 1425
6e19bc4b 1426 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
67af9811 1427 wiphy->max_adj_channel_rssi_comp;
a3ce17d1
CT		 1428 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
1429 jiffies);
06aa7afa
JK		 1430 if (!res)
1431 return NULL;
1432
57fbcce3 1433 if (channel->band == NL80211_BAND_60GHZ) {
6eb18137
DL		 1434 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1435 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1436 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1437 regulatory_hint_found_beacon(wiphy, channel, gfp);
1438 } else {
1439 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1440 regulatory_hint_found_beacon(wiphy, channel, gfp);
1441 }
06aa7afa 1442
0cd01efb 1443 if (non_tx_data && non_tx_data->tx_bss) {
0b8fb823
PX		 1444 /* this is a nontransmitting bss, we need to add it to
1445 * transmitting bss' list if it is not there
1446 */
0cd01efb
SS		 1447 if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
1448 &res->pub)) {
0b8fb823
PX		 1449 if (__cfg80211_unlink_bss(rdev, res))
1450 rdev->bss_generation++;
1451 }
1452 }
1453
4ee3e063 1454 trace_cfg80211_return_bss(&res->pub);
06aa7afa
JK		 1455 /* cfg80211_bss_update gives us a referenced result */
1456 return &res->pub;
1457}
06aa7afa 1458
fe806e49
SS		 1459static const struct element
1460*cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
1461 const struct element *mbssid_elem,
1462 const struct element *sub_elem)
1463{
1464 const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
1465 const struct element *next_mbssid;
1466 const struct element *next_sub;
1467
1468 next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
1469 mbssid_end,
1470 ielen - (mbssid_end - ie));
1471
1472 /*
1473 * If is is not the last subelement in current MBSSID IE or there isn't
1474 * a next MBSSID IE - profile is complete.
1475 */
1476 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
1477 !next_mbssid)
1478 return NULL;
1479
1480 /* For any length error, just return NULL */
1481
1482 if (next_mbssid->datalen < 4)
1483 return NULL;
1484
1485 next_sub = (void *)&next_mbssid->data[1];
1486
1487 if (next_mbssid->data + next_mbssid->datalen <
1488 next_sub->data + next_sub->datalen)
1489 return NULL;
1490
1491 if (next_sub->id != 0 || next_sub->datalen < 2)
1492 return NULL;
1493
1494 /*
1495 * Check if the first element in the next sub element is a start
1496 * of a new profile
1497 */
1498 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
1499 NULL : next_mbssid;
1500}
1501
1502size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
1503 const struct element *mbssid_elem,
1504 const struct element *sub_elem,
5809a5d5 1505 u8 *merged_ie, size_t max_copy_len)
fe806e49
SS		 1506{
1507 size_t copied_len = sub_elem->datalen;
1508 const struct element *next_mbssid;
1509
1510 if (sub_elem->datalen > max_copy_len)
1511 return 0;
1512
5809a5d5 1513 memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
fe806e49
SS		 1514
1515 while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
1516 mbssid_elem,
1517 sub_elem))) {
1518 const struct element *next_sub = (void *)&next_mbssid->data[1];
1519
1520 if (copied_len + next_sub->datalen > max_copy_len)
1521 break;
5809a5d5 1522 memcpy(merged_ie + copied_len, next_sub->data,
fe806e49
SS		 1523 next_sub->datalen);
1524 copied_len += next_sub->datalen;
1525 }
1526
1527 return copied_len;
1528}
1529EXPORT_SYMBOL(cfg80211_merge_profile);
1530
0b8fb823
PX		 1531static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
1532 struct cfg80211_inform_bss *data,
1533 enum cfg80211_bss_frame_type ftype,
1534 const u8 *bssid, u64 tsf,
1535 u16 beacon_interval, const u8 *ie,
1536 size_t ielen,
0cd01efb 1537 struct cfg80211_non_tx_bss *non_tx_data,
0b8fb823
PX		 1538 gfp_t gfp)
1539{
1c8745f3
JB		 1540 const u8 *mbssid_index_ie;
1541 const struct element *elem, *sub;
1542 size_t new_ie_len;
0b8fb823 1543 u8 new_bssid[ETH_ALEN];
fe806e49
SS		 1544 u8 *new_ie, *profile;
1545 u64 seen_indices = 0;
0b8fb823
PX		 1546 u16 capability;
1547 struct cfg80211_bss *bss;
1548
0cd01efb 1549 if (!non_tx_data)
0b8fb823
PX		 1550 return;
1551 if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1552 return;
213ed579
SS		 1553 if (!wiphy->support_mbssid)
1554 return;
1555 if (wiphy->support_only_he_mbssid &&
1556 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1557 return;
0b8fb823 1558
0b8fb823
PX		 1559 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
1560 if (!new_ie)
1561 return;
1562
fe806e49
SS		 1563 profile = kmalloc(ielen, gfp);
1564 if (!profile)
1565 goto out;
1566
1c8745f3
JB		 1567 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
1568 if (elem->datalen < 4)
1569 continue;
1570 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
fe806e49
SS		 1571 u8 profile_len;
1572
1c8745f3 1573 if (sub->id != 0 || sub->datalen < 4) {
0b8fb823
PX		 1574 /* not a valid BSS profile */
1575 continue;
1576 }
1577
1c8745f3
JB		 1578 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
1579 sub->data[1] != 2) {
0b8fb823
PX		 1580 /* The first element within the Nontransmitted
1581 * BSSID Profile is not the Nontransmitted
1582 * BSSID Capability element.
1583 */
1584 continue;
1585 }
1586
fe806e49
SS		 1587 memset(profile, 0, ielen);
1588 profile_len = cfg80211_merge_profile(ie, ielen,
1589 elem,
1590 sub,
5809a5d5 1591 profile,
fe806e49
SS		 1592 ielen);
1593
0b8fb823
PX		 1594 /* found a Nontransmitted BSSID Profile */
1595 mbssid_index_ie = cfg80211_find_ie
1596 (WLAN_EID_MULTI_BSSID_IDX,
fe806e49 1597 profile, profile_len);
0b8fb823 1598 if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
fe806e49
SS		 1599 mbssid_index_ie[2] == 0 ||
1600 mbssid_index_ie[2] > 46) {
0b8fb823
PX		 1601 /* No valid Multiple BSSID-Index element */
1602 continue;
1603 }
1604
ebb3ca3b 1605 if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
fe806e49
SS		 1606 /* We don't support legacy split of a profile */
1607 net_dbg_ratelimited("Partial info for BSSID index %d\n",
1608 mbssid_index_ie[2]);
1609
ebb3ca3b 1610 seen_indices |= BIT_ULL(mbssid_index_ie[2]);
fe806e49 1611
0cd01efb
SS		 1612 non_tx_data->bssid_index = mbssid_index_ie[2];
1613 non_tx_data->max_bssid_indicator = elem->data[0];
1614
1615 cfg80211_gen_new_bssid(bssid,
1616 non_tx_data->max_bssid_indicator,
1617 non_tx_data->bssid_index,
0b8fb823
PX		 1618 new_bssid);
1619 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
fe806e49
SS		 1620 new_ie_len = cfg80211_gen_new_ie(ie, ielen,
1621 profile,
1622 profile_len, new_ie,
0b8fb823
PX		 1623 gfp);
1624 if (!new_ie_len)
1625 continue;
1626
fe806e49 1627 capability = get_unaligned_le16(profile + 2);
0b8fb823
PX		 1628 bss = cfg80211_inform_single_bss_data(wiphy, data,
1629 ftype,
1630 new_bssid, tsf,
1631 capability,
1632 beacon_interval,
1633 new_ie,
1634 new_ie_len,
0cd01efb
SS		 1635 non_tx_data,
1636 gfp);
0b8fb823
PX		 1637 if (!bss)
1638 break;
1639 cfg80211_put_bss(wiphy, bss);
1640 }
0b8fb823
PX		 1641 }
1642
fe806e49 1643out:
0b8fb823 1644 kfree(new_ie);
fe806e49 1645 kfree(profile);
0b8fb823
PX		 1646}
1647
2a519311 1648struct cfg80211_bss *
0b8fb823
PX		 1649cfg80211_inform_bss_data(struct wiphy *wiphy,
1650 struct cfg80211_inform_bss *data,
1651 enum cfg80211_bss_frame_type ftype,
1652 const u8 *bssid, u64 tsf, u16 capability,
1653 u16 beacon_interval, const u8 *ie, size_t ielen,
1654 gfp_t gfp)
1655{
1656 struct cfg80211_bss *res;
0cd01efb 1657 struct cfg80211_non_tx_bss non_tx_data;
0b8fb823
PX		 1658
1659 res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
1660 capability, beacon_interval, ie,
1661 ielen, NULL, gfp);
0cd01efb 1662 non_tx_data.tx_bss = res;
0b8fb823 1663 cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
0cd01efb
SS		 1664 beacon_interval, ie, ielen, &non_tx_data,
1665 gfp);
0b8fb823
PX		 1666 return res;
1667}
1668EXPORT_SYMBOL(cfg80211_inform_bss_data);
1669
1670static void
1671cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
1672 struct cfg80211_inform_bss *data,
1673 struct ieee80211_mgmt *mgmt, size_t len,
0cd01efb 1674 struct cfg80211_non_tx_bss *non_tx_data,
0b8fb823
PX		 1675 gfp_t gfp)
1676{
1677 enum cfg80211_bss_frame_type ftype;
1678 const u8 *ie = mgmt->u.probe_resp.variable;
1679 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1680 u.probe_resp.variable);
1681
1682 ftype = ieee80211_is_beacon(mgmt->frame_control) ?
1683 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
1684
1685 cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
1686 le64_to_cpu(mgmt->u.probe_resp.timestamp),
1687 le16_to_cpu(mgmt->u.probe_resp.beacon_int),
0cd01efb 1688 ie, ielen, non_tx_data, gfp);
0b8fb823
PX		 1689}
1690
1691static void
1692cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
7011ba58 1693 struct cfg80211_bss *nontrans_bss,
0b8fb823
PX		 1694 struct ieee80211_mgmt *mgmt, size_t len,
1695 gfp_t gfp)
1696{
1697 u8 *ie, *new_ie, *pos;
1698 const u8 *nontrans_ssid, *trans_ssid, *mbssid;
1699 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1700 u.probe_resp.variable);
1701 size_t new_ie_len;
1702 struct cfg80211_bss_ies *new_ies;
1703 const struct cfg80211_bss_ies *old;
1704 u8 cpy_len;
1705
1706 ie = mgmt->u.probe_resp.variable;
1707
1708 new_ie_len = ielen;
1709 trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
1710 if (!trans_ssid)
1711 return;
1712 new_ie_len -= trans_ssid[1];
1713 mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
1714 if (!mbssid)
1715 return;
1716 new_ie_len -= mbssid[1];
1717 rcu_read_lock();
7011ba58 1718 nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
0b8fb823
PX		 1719 if (!nontrans_ssid) {
1720 rcu_read_unlock();
1721 return;
1722 }
1723 new_ie_len += nontrans_ssid[1];
1724 rcu_read_unlock();
1725
1726 /* generate new ie for nontrans BSS
1727 * 1. replace SSID with nontrans BSS' SSID
1728 * 2. skip MBSSID IE
1729 */
1730 new_ie = kzalloc(new_ie_len, gfp);
1731 if (!new_ie)
1732 return;
1733 new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, gfp);
bede8d29
SS		 1734 if (!new_ies)
1735 goto out_free;
0b8fb823
PX		 1736
1737 pos = new_ie;
1738
1739 /* copy the nontransmitted SSID */
1740 cpy_len = nontrans_ssid[1] + 2;
1741 memcpy(pos, nontrans_ssid, cpy_len);
1742 pos += cpy_len;
1743 /* copy the IEs between SSID and MBSSID */
1744 cpy_len = trans_ssid[1] + 2;
1745 memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
1746 pos += (mbssid - (trans_ssid + cpy_len));
1747 /* copy the IEs after MBSSID */
1748 cpy_len = mbssid[1] + 2;
1749 memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
1750
1751 /* update ie */
1752 new_ies->len = new_ie_len;
1753 new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1754 new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1755 memcpy(new_ies->data, new_ie, new_ie_len);
1756 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
7011ba58
SS		 1757 old = rcu_access_pointer(nontrans_bss->proberesp_ies);
1758 rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
1759 rcu_assign_pointer(nontrans_bss->ies, new_ies);
0b8fb823
PX		 1760 if (old)
1761 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1762 } else {
7011ba58
SS		 1763 old = rcu_access_pointer(nontrans_bss->beacon_ies);
1764 rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
1765 rcu_assign_pointer(nontrans_bss->ies, new_ies);
0b8fb823
PX		 1766 if (old)
1767 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1768 }
bede8d29
SS		 1769
1770out_free:
1771 kfree(new_ie);
0b8fb823 1772}
6e19bc4b 1773
0b8fb823
PX		 1774/* cfg80211_inform_bss_width_frame helper */
1775static struct cfg80211_bss *
1776cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
1777 struct cfg80211_inform_bss *data,
1778 struct ieee80211_mgmt *mgmt, size_t len,
0cd01efb 1779 struct cfg80211_non_tx_bss *non_tx_data,
0b8fb823 1780 gfp_t gfp)
2a519311 1781{
9caf0364
JB		 1782 struct cfg80211_internal_bss tmp = {}, *res;
1783 struct cfg80211_bss_ies *ies;
3afc2167 1784 struct ieee80211_channel *channel;
67af9811 1785 bool signal_valid;
2a519311
JB		 1786 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1787 u.probe_resp.variable);
6eb18137 1788 int bss_type;
bef9bacc 1789
0172bb75
JB		 1790 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
1791 offsetof(struct ieee80211_mgmt, u.beacon.variable));
1792
6e19bc4b 1793 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
4ee3e063 1794
bef9bacc
MK		 1795 if (WARN_ON(!mgmt))
1796 return NULL;
1797
1798 if (WARN_ON(!wiphy))
1799 return NULL;
2a519311 1800
22fe88d3 1801 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
6e19bc4b 1802 (data->signal < 0 || data->signal > 100)))
2a519311
JB		 1803 return NULL;
1804
bef9bacc 1805 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
2a519311
JB		 1806 return NULL;
1807
0172bb75 1808 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
119f94a6 1809 ielen, data->chan, data->scan_width);
0172bb75
JB		 1810 if (!channel)
1811 return NULL;
1812
0e227084 1813 ies = kzalloc(sizeof(*ies) + ielen, gfp);
9caf0364 1814 if (!ies)
2a519311 1815 return NULL;
9caf0364 1816 ies->len = ielen;
8cef2c9d 1817 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
0e227084 1818 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
9caf0364 1819 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
2a519311 1820
9caf0364
JB		 1821 if (ieee80211_is_probe_resp(mgmt->frame_control))
1822 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1823 else
1824 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1825 rcu_assign_pointer(tmp.pub.ies, ies);
505a2e88 1826
9caf0364
JB		 1827 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
1828 tmp.pub.channel = channel;
6e19bc4b
DS		 1829 tmp.pub.scan_width = data->scan_width;
1830 tmp.pub.signal = data->signal;
9caf0364
JB		 1831 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
1832 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
6e19bc4b 1833 tmp.ts_boottime = data->boottime_ns;
1d76250b 1834 tmp.parent_tsf = data->parent_tsf;
983dafaa
SD		 1835 tmp.pub.chains = data->chains;
1836 memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
1d76250b 1837 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
0cd01efb
SS		 1838 if (non_tx_data) {
1839 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
1840 tmp.pub.bssid_index = non_tx_data->bssid_index;
1841 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
1842 }
9caf0364 1843
6e19bc4b 1844 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
67af9811 1845 wiphy->max_adj_channel_rssi_comp;
a3ce17d1
CT		 1846 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
1847 jiffies);
2a519311
JB		 1848 if (!res)
1849 return NULL;
1850
57fbcce3 1851 if (channel->band == NL80211_BAND_60GHZ) {
6eb18137
DL		 1852 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1853 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1854 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1855 regulatory_hint_found_beacon(wiphy, channel, gfp);
1856 } else {
1857 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1858 regulatory_hint_found_beacon(wiphy, channel, gfp);
1859 }
e38f8a7a 1860
4ee3e063 1861 trace_cfg80211_return_bss(&res->pub);
2a519311
JB		 1862 /* cfg80211_bss_update gives us a referenced result */
1863 return &res->pub;
1864}
0b8fb823
PX		 1865
1866struct cfg80211_bss *
1867cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
1868 struct cfg80211_inform_bss *data,
1869 struct ieee80211_mgmt *mgmt, size_t len,
1870 gfp_t gfp)
1871{
7011ba58 1872 struct cfg80211_bss *res, *tmp_bss;
0b8fb823
PX		 1873 const u8 *ie = mgmt->u.probe_resp.variable;
1874 const struct cfg80211_bss_ies *ies1, *ies2;
1875 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1876 u.probe_resp.variable);
0cd01efb 1877 struct cfg80211_non_tx_bss non_tx_data;
0b8fb823
PX		 1878
1879 res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
1880 len, NULL, gfp);
213ed579
SS		 1881 if (!res || !wiphy->support_mbssid ||
1882 !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1883 return res;
1884 if (wiphy->support_only_he_mbssid &&
1885 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
0b8fb823
PX		 1886 return res;
1887
0cd01efb 1888 non_tx_data.tx_bss = res;
0b8fb823 1889 /* process each non-transmitting bss */
0cd01efb
SS		 1890 cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
1891 &non_tx_data, gfp);
0b8fb823
PX		 1892
1893 /* check if the res has other nontransmitting bss which is not
1894 * in MBSSID IE
1895 */
1896 ies1 = rcu_access_pointer(res->ies);
0b8fb823
PX		 1897
1898 /* go through nontrans_list, if the timestamp of the BSS is
1899 * earlier than the timestamp of the transmitting BSS then
1900 * update it
1901 */
7011ba58 1902 list_for_each_entry(tmp_bss, &res->nontrans_list,
0b8fb823 1903 nontrans_list) {
7011ba58 1904 ies2 = rcu_access_pointer(tmp_bss->ies);
0b8fb823
PX		 1905 if (ies2->tsf < ies1->tsf)
1906 cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
1907 mgmt, len, gfp);
1908 }
1909
1910 return res;
1911}
6e19bc4b 1912EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
2a519311 1913
5b112d3d 1914void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
4c0c0b75 1915{
f26cbf40 1916 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
4c0c0b75
JB		 1917 struct cfg80211_internal_bss *bss;
1918
1919 if (!pub)
1920 return;
1921
1922 bss = container_of(pub, struct cfg80211_internal_bss, pub);
776b3580 1923
1b8ec87a
ZG		 1924 spin_lock_bh(&rdev->bss_lock);
1925 bss_ref_get(rdev, bss);
1926 spin_unlock_bh(&rdev->bss_lock);
4c0c0b75
JB		 1927}
1928EXPORT_SYMBOL(cfg80211_ref_bss);
1929
5b112d3d 1930void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2a519311 1931{
f26cbf40 1932 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2a519311
JB		 1933 struct cfg80211_internal_bss *bss;
1934
1935 if (!pub)
1936 return;
1937
1938 bss = container_of(pub, struct cfg80211_internal_bss, pub);
776b3580 1939
1b8ec87a
ZG		 1940 spin_lock_bh(&rdev->bss_lock);
1941 bss_ref_put(rdev, bss);
1942 spin_unlock_bh(&rdev->bss_lock);
2a519311
JB		 1943}
1944EXPORT_SYMBOL(cfg80211_put_bss);
1945
d491af19
JB		 1946void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1947{
f26cbf40 1948 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
7011ba58
SS		 1949 struct cfg80211_internal_bss *bss, *tmp1;
1950 struct cfg80211_bss *nontrans_bss, *tmp;
d491af19
JB		 1951
1952 if (WARN_ON(!pub))
1953 return;
1954
1955 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1956
1b8ec87a 1957 spin_lock_bh(&rdev->bss_lock);
7011ba58
SS		 1958 if (list_empty(&bss->list))
1959 goto out;
1960
1961 list_for_each_entry_safe(nontrans_bss, tmp,
1962 &pub->nontrans_list,
1963 nontrans_list) {
1964 tmp1 = container_of(nontrans_bss,
1965 struct cfg80211_internal_bss, pub);
1966 if (__cfg80211_unlink_bss(rdev, tmp1))
1b8ec87a 1967 rdev->bss_generation++;
3207390a 1968 }
7011ba58
SS		 1969
1970 if (__cfg80211_unlink_bss(rdev, bss))
1971 rdev->bss_generation++;
1972out:
1b8ec87a 1973 spin_unlock_bh(&rdev->bss_lock);
d491af19
JB		 1974}
1975EXPORT_SYMBOL(cfg80211_unlink_bss);
1976
4770c8f9
IP		 1977void cfg80211_bss_iter(struct wiphy *wiphy,
1978 struct cfg80211_chan_def *chandef,
1979 void (*iter)(struct wiphy *wiphy,
1980 struct cfg80211_bss *bss,
1981 void *data),
1982 void *iter_data)
1983{
1984 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1985 struct cfg80211_internal_bss *bss;
1986
1987 spin_lock_bh(&rdev->bss_lock);
1988
1989 list_for_each_entry(bss, &rdev->bss_list, list) {
1990 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
1991 iter(wiphy, &bss->pub, iter_data);
1992 }
1993
1994 spin_unlock_bh(&rdev->bss_lock);
1995}
1996EXPORT_SYMBOL(cfg80211_bss_iter);
1997
3d23e349 1998#ifdef CONFIG_CFG80211_WEXT
9f419f38
JB		 1999static struct cfg80211_registered_device *
2000cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
2001{
5fe231e8 2002 struct cfg80211_registered_device *rdev;
9f419f38
JB		 2003 struct net_device *dev;
2004
5fe231e8
JB		 2005 ASSERT_RTNL();
2006
9f419f38
JB		 2007 dev = dev_get_by_index(net, ifindex);
2008 if (!dev)
5fe231e8
JB		 2009 return ERR_PTR(-ENODEV);
2010 if (dev->ieee80211_ptr)
f26cbf40 2011 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
5fe231e8 2012 else
9f419f38
JB		 2013 rdev = ERR_PTR(-ENODEV);
2014 dev_put(dev);
9f419f38
JB		 2015 return rdev;
2016}
2017
2a519311
JB		 2018int cfg80211_wext_siwscan(struct net_device *dev,
2019 struct iw_request_info *info,
2020 union iwreq_data *wrqu, char *extra)
2021{
2022 struct cfg80211_registered_device *rdev;
2023 struct wiphy *wiphy;
2024 struct iw_scan_req *wreq = NULL;
65486c8b 2025 struct cfg80211_scan_request *creq = NULL;
2a519311 2026 int i, err, n_channels = 0;
57fbcce3 2027 enum nl80211_band band;
2a519311
JB		 2028
2029 if (!netif_running(dev))
2030 return -ENETDOWN;
2031
b2e3abdc
HS		 2032 if (wrqu->data.length == sizeof(struct iw_scan_req))
2033 wreq = (struct iw_scan_req *)extra;
2034
463d0183 2035 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2a519311
JB		 2036
2037 if (IS_ERR(rdev))
2038 return PTR_ERR(rdev);
2039
f9d15d16 2040 if (rdev->scan_req || rdev->scan_msg) {
2a519311
JB		 2041 err = -EBUSY;
2042 goto out;
2043 }
2044
2045 wiphy = &rdev->wiphy;
2046
b2e3abdc
HS		 2047 /* Determine number of channels, needed to allocate creq */
2048 if (wreq && wreq->num_channels)
2049 n_channels = wreq->num_channels;
bdfbec2d
IP		 2050 else
2051 n_channels = ieee80211_get_num_supported_channels(wiphy);
2a519311
JB		 2052
2053 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
2054 n_channels * sizeof(void *),
2055 GFP_ATOMIC);
2056 if (!creq) {
2057 err = -ENOMEM;
2058 goto out;
2059 }
2060
2061 creq->wiphy = wiphy;
fd014284 2062 creq->wdev = dev->ieee80211_ptr;
5ba63533
JB		 2063 /* SSIDs come after channels */
2064 creq->ssids = (void *)&creq->channels[n_channels];
2a519311
JB		 2065 creq->n_channels = n_channels;
2066 creq->n_ssids = 1;
15d6030b 2067 creq->scan_start = jiffies;
2a519311 2068
b2e3abdc 2069 /* translate "Scan on frequencies" request */
2a519311 2070 i = 0;
57fbcce3 2071 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2a519311 2072 int j;
584991dc 2073
2a519311
JB		 2074 if (!wiphy->bands[band])
2075 continue;
584991dc 2076
2a519311 2077 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
584991dc
JB		 2078 /* ignore disabled channels */
2079 if (wiphy->bands[band]->channels[j].flags &
2080 IEEE80211_CHAN_DISABLED)
2081 continue;
b2e3abdc
HS		 2082
2083 /* If we have a wireless request structure and the
2084 * wireless request specifies frequencies, then search
2085 * for the matching hardware channel.
2086 */
2087 if (wreq && wreq->num_channels) {
2088 int k;
2089 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
2090 for (k = 0; k < wreq->num_channels; k++) {
96998e3a
ZG		 2091 struct iw_freq *freq =
2092 &wreq->channel_list[k];
2093 int wext_freq =
2094 cfg80211_wext_freq(freq);
2095
b2e3abdc
HS		 2096 if (wext_freq == wiphy_freq)
2097 goto wext_freq_found;
2098 }
2099 goto wext_freq_not_found;
2100 }
2101
2102 wext_freq_found:
2a519311
JB		 2103 creq->channels[i] = &wiphy->bands[band]->channels[j];
2104 i++;
b2e3abdc 2105 wext_freq_not_found: ;
2a519311
JB		 2106 }
2107 }
8862dc5f
HS		 2108 /* No channels found? */
2109 if (!i) {
2110 err = -EINVAL;
2111 goto out;
2112 }
2a519311 2113
b2e3abdc
HS		 2114 /* Set real number of channels specified in creq->channels[] */
2115 creq->n_channels = i;
2a519311 2116
b2e3abdc
HS		 2117 /* translate "Scan for SSID" request */
2118 if (wreq) {
2a519311 2119 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
65486c8b
JB		 2120 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
2121 err = -EINVAL;
2122 goto out;
2123 }
2a519311
JB		 2124 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
2125 creq->ssids[0].ssid_len = wreq->essid_len;
2126 }
2127 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
2128 creq->n_ssids = 0;
2129 }
2130
57fbcce3 2131 for (i = 0; i < NUM_NL80211_BANDS; i++)
a401d2bb
JB		 2132 if (wiphy->bands[i])
2133 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
34850ab2 2134
818965d3
JM		 2135 eth_broadcast_addr(creq->bssid);
2136
2a519311 2137 rdev->scan_req = creq;
e35e4d28 2138 err = rdev_scan(rdev, creq);
2a519311
JB		 2139 if (err) {
2140 rdev->scan_req = NULL;
65486c8b 2141 /* creq will be freed below */
463d0183 2142 } else {
fd014284 2143 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
65486c8b
JB		 2144 /* creq now owned by driver */
2145 creq = NULL;
463d0183
JB		 2146 dev_hold(dev);
2147 }
2a519311 2148 out:
65486c8b 2149 kfree(creq);
2a519311
JB		 2150 return err;
2151}
2afe38d1 2152EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
2a519311 2153
76a70e9c
JM		 2154static char *ieee80211_scan_add_ies(struct iw_request_info *info,
2155 const struct cfg80211_bss_ies *ies,
2156 char *current_ev, char *end_buf)
2a519311 2157{
9caf0364 2158 const u8 *pos, *end, *next;
2a519311
JB		 2159 struct iw_event iwe;
2160
9caf0364 2161 if (!ies)
76a70e9c 2162 return current_ev;
2a519311
JB		 2163
2164 /*
2165 * If needed, fragment the IEs buffer (at IE boundaries) into short
2166 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
2167 */
9caf0364
JB		 2168 pos = ies->data;
2169 end = pos + ies->len;
2a519311
JB		 2170
2171 while (end - pos > IW_GENERIC_IE_MAX) {
2172 next = pos + 2 + pos[1];
2173 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
2174 next = next + 2 + next[1];
2175
2176 memset(&iwe, 0, sizeof(iwe));
2177 iwe.cmd = IWEVGENIE;
2178 iwe.u.data.length = next - pos;
76a70e9c
JM		 2179 current_ev = iwe_stream_add_point_check(info, current_ev,
2180 end_buf, &iwe,
2181 (void *)pos);
2182 if (IS_ERR(current_ev))
2183 return current_ev;
2a519311
JB		 2184 pos = next;
2185 }
2186
2187 if (end > pos) {
2188 memset(&iwe, 0, sizeof(iwe));
2189 iwe.cmd = IWEVGENIE;
2190 iwe.u.data.length = end - pos;
76a70e9c
JM		 2191 current_ev = iwe_stream_add_point_check(info, current_ev,
2192 end_buf, &iwe,
2193 (void *)pos);
2194 if (IS_ERR(current_ev))
2195 return current_ev;
2a519311 2196 }
76a70e9c
JM		 2197
2198 return current_ev;
2a519311
JB		 2199}
2200
2a519311 2201static char *
77965c97
JB		 2202ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
2203 struct cfg80211_internal_bss *bss, char *current_ev,
2204 char *end_buf)
2a519311 2205{
9caf0364 2206 const struct cfg80211_bss_ies *ies;
2a519311 2207 struct iw_event iwe;
9caf0364 2208 const u8 *ie;
76a70e9c
JM		 2209 u8 buf[50];
2210 u8 *cfg, *p, *tmp;
9caf0364 2211 int rem, i, sig;
2a519311
JB		 2212 bool ismesh = false;
2213
2214 memset(&iwe, 0, sizeof(iwe));
2215 iwe.cmd = SIOCGIWAP;
2216 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2217 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
76a70e9c
JM		 2218 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2219 IW_EV_ADDR_LEN);
2220 if (IS_ERR(current_ev))
2221 return current_ev;
2a519311
JB		 2222
2223 memset(&iwe, 0, sizeof(iwe));
2224 iwe.cmd = SIOCGIWFREQ;
2225 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
2226 iwe.u.freq.e = 0;
76a70e9c
JM		 2227 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2228 IW_EV_FREQ_LEN);
2229 if (IS_ERR(current_ev))
2230 return current_ev;
2a519311
JB		 2231
2232 memset(&iwe, 0, sizeof(iwe));
2233 iwe.cmd = SIOCGIWFREQ;
2234 iwe.u.freq.m = bss->pub.channel->center_freq;
2235 iwe.u.freq.e = 6;
76a70e9c
JM		 2236 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2237 IW_EV_FREQ_LEN);
2238 if (IS_ERR(current_ev))
2239 return current_ev;
2a519311 2240
77965c97 2241 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2a519311
JB		 2242 memset(&iwe, 0, sizeof(iwe));
2243 iwe.cmd = IWEVQUAL;
2244 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
2245 IW_QUAL_NOISE_INVALID |
a77b8552 2246 IW_QUAL_QUAL_UPDATED;
77965c97 2247 switch (wiphy->signal_type) {
2a519311 2248 case CFG80211_SIGNAL_TYPE_MBM:
a77b8552
JB		 2249 sig = bss->pub.signal / 100;
2250 iwe.u.qual.level = sig;
2a519311 2251 iwe.u.qual.updated |= IW_QUAL_DBM;
a77b8552
JB		 2252 if (sig < -110) /* rather bad */
2253 sig = -110;
2254 else if (sig > -40) /* perfect */
2255 sig = -40;
2256 /* will give a range of 0 .. 70 */
2257 iwe.u.qual.qual = sig + 110;
2a519311
JB		 2258 break;
2259 case CFG80211_SIGNAL_TYPE_UNSPEC:
2260 iwe.u.qual.level = bss->pub.signal;
a77b8552
JB		 2261 /* will give range 0 .. 100 */
2262 iwe.u.qual.qual = bss->pub.signal;
2a519311
JB		 2263 break;
2264 default:
2265 /* not reached */
2266 break;
2267 }
76a70e9c
JM		 2268 current_ev = iwe_stream_add_event_check(info, current_ev,
2269 end_buf, &iwe,
2270 IW_EV_QUAL_LEN);
2271 if (IS_ERR(current_ev))
2272 return current_ev;
2a519311
JB		 2273 }
2274
2275 memset(&iwe, 0, sizeof(iwe));
2276 iwe.cmd = SIOCGIWENCODE;
2277 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
2278 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2279 else
2280 iwe.u.data.flags = IW_ENCODE_DISABLED;
2281 iwe.u.data.length = 0;
76a70e9c
JM		 2282 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2283 &iwe, "");
2284 if (IS_ERR(current_ev))
2285 return current_ev;
2a519311 2286
9caf0364
JB		 2287 rcu_read_lock();
2288 ies = rcu_dereference(bss->pub.ies);
83c7aa1a
JB		 2289 rem = ies->len;
2290 ie = ies->data;
9caf0364 2291
83c7aa1a 2292 while (rem >= 2) {
2a519311
JB		 2293 /* invalid data */
2294 if (ie[1] > rem - 2)
2295 break;
2296
2297 switch (ie[0]) {
2298 case WLAN_EID_SSID:
2299 memset(&iwe, 0, sizeof(iwe));
2300 iwe.cmd = SIOCGIWESSID;
2301 iwe.u.data.length = ie[1];
2302 iwe.u.data.flags = 1;
76a70e9c
JM		 2303 current_ev = iwe_stream_add_point_check(info,
2304 current_ev,
2305 end_buf, &iwe,
2306 (u8 *)ie + 2);
2307 if (IS_ERR(current_ev))
2308 goto unlock;
2a519311
JB		 2309 break;
2310 case WLAN_EID_MESH_ID:
2311 memset(&iwe, 0, sizeof(iwe));
2312 iwe.cmd = SIOCGIWESSID;
2313 iwe.u.data.length = ie[1];
2314 iwe.u.data.flags = 1;
76a70e9c
JM		 2315 current_ev = iwe_stream_add_point_check(info,
2316 current_ev,
2317 end_buf, &iwe,
2318 (u8 *)ie + 2);
2319 if (IS_ERR(current_ev))
2320 goto unlock;
2a519311
JB		 2321 break;
2322 case WLAN_EID_MESH_CONFIG:
2323 ismesh = true;
136cfa28 2324 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2a519311 2325 break;
9caf0364 2326 cfg = (u8 *)ie + 2;
2a519311
JB		 2327 memset(&iwe, 0, sizeof(iwe));
2328 iwe.cmd = IWEVCUSTOM;
76aa5e70
RP		 2329 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
2330 "0x%02X", cfg[0]);
2a519311 2331 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2332 current_ev = iwe_stream_add_point_check(info,
2333 current_ev,
2334 end_buf,
2335 &iwe, buf);
2336 if (IS_ERR(current_ev))
2337 goto unlock;
76aa5e70
RP		 2338 sprintf(buf, "Path Selection Metric ID: 0x%02X",
2339 cfg[1]);
2a519311 2340 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2341 current_ev = iwe_stream_add_point_check(info,
2342 current_ev,
2343 end_buf,
2344 &iwe, buf);
2345 if (IS_ERR(current_ev))
2346 goto unlock;
76aa5e70
RP		 2347 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
2348 cfg[2]);
2a519311 2349 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2350 current_ev = iwe_stream_add_point_check(info,
2351 current_ev,
2352 end_buf,
2353 &iwe, buf);
2354 if (IS_ERR(current_ev))
2355 goto unlock;
76aa5e70 2356 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
2a519311 2357 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2358 current_ev = iwe_stream_add_point_check(info,
2359 current_ev,
2360 end_buf,
2361 &iwe, buf);
2362 if (IS_ERR(current_ev))
2363 goto unlock;
76aa5e70
RP		 2364 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
2365 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2366 current_ev = iwe_stream_add_point_check(info,
2367 current_ev,
2368 end_buf,
2369 &iwe, buf);
2370 if (IS_ERR(current_ev))
2371 goto unlock;
76aa5e70
RP		 2372 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
2373 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2374 current_ev = iwe_stream_add_point_check(info,
2375 current_ev,
2376 end_buf,
2377 &iwe, buf);
2378 if (IS_ERR(current_ev))
2379 goto unlock;
76aa5e70 2380 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
2a519311 2381 iwe.u.data.length = strlen(buf);
76a70e9c
JM		 2382 current_ev = iwe_stream_add_point_check(info,
2383 current_ev,
2384 end_buf,
2385 &iwe, buf);
2386 if (IS_ERR(current_ev))
2387 goto unlock;
2a519311
JB		 2388 break;
2389 case WLAN_EID_SUPP_RATES:
2390 case WLAN_EID_EXT_SUPP_RATES:
2391 /* display all supported rates in readable format */
2392 p = current_ev + iwe_stream_lcp_len(info);
2393
2394 memset(&iwe, 0, sizeof(iwe));
2395 iwe.cmd = SIOCGIWRATE;
2396 /* Those two flags are ignored... */
2397 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2398
2399 for (i = 0; i < ie[1]; i++) {
2400 iwe.u.bitrate.value =
2401 ((ie[i + 2] & 0x7f) * 500000);
76a70e9c 2402 tmp = p;
2a519311 2403 p = iwe_stream_add_value(info, current_ev, p,
76a70e9c
JM		 2404 end_buf, &iwe,
2405 IW_EV_PARAM_LEN);
2406 if (p == tmp) {
2407 current_ev = ERR_PTR(-E2BIG);
2408 goto unlock;
2409 }
2a519311
JB		 2410 }
2411 current_ev = p;
2412 break;
2413 }
2414 rem -= ie[1] + 2;
2415 ie += ie[1] + 2;
2416 }
2417
f64f9e71
JP		 2418 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
2419 ismesh) {
2a519311
JB		 2420 memset(&iwe, 0, sizeof(iwe));
2421 iwe.cmd = SIOCGIWMODE;
2422 if (ismesh)
2423 iwe.u.mode = IW_MODE_MESH;
2424 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
2425 iwe.u.mode = IW_MODE_MASTER;
2426 else
2427 iwe.u.mode = IW_MODE_ADHOC;
76a70e9c
JM		 2428 current_ev = iwe_stream_add_event_check(info, current_ev,
2429 end_buf, &iwe,
2430 IW_EV_UINT_LEN);
2431 if (IS_ERR(current_ev))
2432 goto unlock;
2a519311
JB		 2433 }
2434
76a70e9c
JM		 2435 memset(&iwe, 0, sizeof(iwe));
2436 iwe.cmd = IWEVCUSTOM;
2437 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
2438 iwe.u.data.length = strlen(buf);
2439 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2440 &iwe, buf);
2441 if (IS_ERR(current_ev))
2442 goto unlock;
2443 memset(&iwe, 0, sizeof(iwe));
2444 iwe.cmd = IWEVCUSTOM;
2445 sprintf(buf, " Last beacon: %ums ago",
2446 elapsed_jiffies_msecs(bss->ts));
2447 iwe.u.data.length = strlen(buf);
2448 current_ev = iwe_stream_add_point_check(info, current_ev,
2449 end_buf, &iwe, buf);
2450 if (IS_ERR(current_ev))
2451 goto unlock;
2452
2453 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
2454
2455 unlock:
9caf0364 2456 rcu_read_unlock();
2a519311
JB		 2457 return current_ev;
2458}
2459
2460
1b8ec87a 2461static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
2a519311
JB		 2462 struct iw_request_info *info,
2463 char *buf, size_t len)
2464{
2465 char *current_ev = buf;
2466 char *end_buf = buf + len;
2467 struct cfg80211_internal_bss *bss;
76a70e9c 2468 int err = 0;
2a519311 2469
1b8ec87a
ZG		 2470 spin_lock_bh(&rdev->bss_lock);
2471 cfg80211_bss_expire(rdev);
2a519311 2472
1b8ec87a 2473 list_for_each_entry(bss, &rdev->bss_list, list) {
2a519311 2474 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
76a70e9c
JM		 2475 err = -E2BIG;
2476 break;
2a519311 2477 }
1b8ec87a 2478 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
77965c97 2479 current_ev, end_buf);
76a70e9c
JM		 2480 if (IS_ERR(current_ev)) {
2481 err = PTR_ERR(current_ev);
2482 break;
2483 }
2a519311 2484 }
1b8ec87a 2485 spin_unlock_bh(&rdev->bss_lock);
76a70e9c
JM		 2486
2487 if (err)
2488 return err;
2a519311
JB		 2489 return current_ev - buf;
2490}
2491
2492
2493int cfg80211_wext_giwscan(struct net_device *dev,
2494 struct iw_request_info *info,
2495 struct iw_point *data, char *extra)
2496{
2497 struct cfg80211_registered_device *rdev;
2498 int res;
2499
2500 if (!netif_running(dev))
2501 return -ENETDOWN;
2502
463d0183 2503 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2a519311
JB		 2504
2505 if (IS_ERR(rdev))
2506 return PTR_ERR(rdev);
2507
f9d15d16 2508 if (rdev->scan_req || rdev->scan_msg)
5fe231e8 2509 return -EAGAIN;
2a519311
JB		 2510
2511 res = ieee80211_scan_results(rdev, info, extra, data->length);
2512 data->length = 0;
2513 if (res >= 0) {
2514 data->length = res;
2515 res = 0;
2516 }
2517
2a519311
JB		 2518 return res;
2519}
2afe38d1 2520EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
2a519311 2521#endif
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